diff options
Diffstat (limited to 'arch/powerpc/kernel')
198 files changed, 83606 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/.gitignore b/arch/powerpc/kernel/.gitignore new file mode 100644 index 000000000..d71179d3f --- /dev/null +++ b/arch/powerpc/kernel/.gitignore @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0-only +prom_init_check +vmlinux.lds diff --git a/arch/powerpc/kernel/85xx_entry_mapping.S b/arch/powerpc/kernel/85xx_entry_mapping.S new file mode 100644 index 000000000..dedc17fac --- /dev/null +++ b/arch/powerpc/kernel/85xx_entry_mapping.S @@ -0,0 +1,230 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +/* 1. Find the index of the entry we're executing in */ + bcl 20,31,$+4 /* Find our address */ +invstr: mflr r6 /* Make it accessible */ + mfmsr r7 + rlwinm r4,r7,27,31,31 /* extract MSR[IS] */ + mfspr r7, SPRN_PID0 + slwi r7,r7,16 + or r7,r7,r4 + mtspr SPRN_MAS6,r7 + tlbsx 0,r6 /* search MSR[IS], SPID=PID0 */ + mfspr r7,SPRN_MAS1 + andis. r7,r7,MAS1_VALID@h + bne match_TLB + + mfspr r7,SPRN_MMUCFG + rlwinm r7,r7,21,28,31 /* extract MMUCFG[NPIDS] */ + cmpwi r7,3 + bne match_TLB /* skip if NPIDS != 3 */ + + mfspr r7,SPRN_PID1 + slwi r7,r7,16 + or r7,r7,r4 + mtspr SPRN_MAS6,r7 + tlbsx 0,r6 /* search MSR[IS], SPID=PID1 */ + mfspr r7,SPRN_MAS1 + andis. r7,r7,MAS1_VALID@h + bne match_TLB + mfspr r7, SPRN_PID2 + slwi r7,r7,16 + or r7,r7,r4 + mtspr SPRN_MAS6,r7 + tlbsx 0,r6 /* Fall through, we had to match */ + +match_TLB: + mfspr r7,SPRN_MAS0 + rlwinm r3,r7,16,20,31 /* Extract MAS0(Entry) */ + + mfspr r7,SPRN_MAS1 /* Insure IPROT set */ + oris r7,r7,MAS1_IPROT@h + mtspr SPRN_MAS1,r7 + tlbwe + +/* 2. Invalidate all entries except the entry we're executing in */ + mfspr r9,SPRN_TLB1CFG + andi. r9,r9,0xfff + li r6,0 /* Set Entry counter to 0 */ +1: lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */ + rlwimi r7,r6,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r6) */ + mtspr SPRN_MAS0,r7 + tlbre + mfspr r7,SPRN_MAS1 + rlwinm r7,r7,0,2,31 /* Clear MAS1 Valid and IPROT */ + cmpw r3,r6 + beq skpinv /* Dont update the current execution TLB */ + mtspr SPRN_MAS1,r7 + tlbwe + isync +skpinv: addi r6,r6,1 /* Increment */ + cmpw r6,r9 /* Are we done? */ + bne 1b /* If not, repeat */ + + /* Invalidate TLB0 */ + li r6,0x04 + tlbivax 0,r6 + TLBSYNC + /* Invalidate TLB1 */ + li r6,0x0c + tlbivax 0,r6 + TLBSYNC + +/* 3. Setup a temp mapping and jump to it */ + andi. r5, r3, 0x1 /* Find an entry not used and is non-zero */ + addi r5, r5, 0x1 + lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */ + rlwimi r7,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */ + mtspr SPRN_MAS0,r7 + tlbre + + /* grab and fixup the RPN */ + mfspr r6,SPRN_MAS1 /* extract MAS1[SIZE] */ + rlwinm r6,r6,25,27,31 + li r8,-1 + addi r6,r6,10 + slw r6,r8,r6 /* convert to mask */ + + bcl 20,31,$+4 /* Find our address */ +1: mflr r7 + + mfspr r8,SPRN_MAS3 +#ifdef CONFIG_PHYS_64BIT + mfspr r23,SPRN_MAS7 +#endif + and r8,r6,r8 + subfic r9,r6,-4096 + and r9,r9,r7 + + or r25,r8,r9 + ori r8,r25,(MAS3_SX|MAS3_SW|MAS3_SR) + + /* Just modify the entry ID and EPN for the temp mapping */ + lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */ + rlwimi r7,r5,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r5) */ + mtspr SPRN_MAS0,r7 + xori r6,r4,1 /* Setup TMP mapping in the other Address space */ + slwi r6,r6,12 + oris r6,r6,(MAS1_VALID|MAS1_IPROT)@h + ori r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_4K))@l + mtspr SPRN_MAS1,r6 + mfspr r6,SPRN_MAS2 + li r7,0 /* temp EPN = 0 */ + rlwimi r7,r6,0,20,31 + mtspr SPRN_MAS2,r7 + mtspr SPRN_MAS3,r8 + tlbwe + + xori r6,r4,1 + slwi r6,r6,5 /* setup new context with other address space */ + bcl 20,31,$+4 /* Find our address */ +1: mflr r9 + rlwimi r7,r9,0,20,31 + addi r7,r7,(2f - 1b) + mtspr SPRN_SRR0,r7 + mtspr SPRN_SRR1,r6 + rfi +2: +/* 4. Clear out PIDs & Search info */ + li r6,0 + mtspr SPRN_MAS6,r6 + mtspr SPRN_PID0,r6 + + mfspr r7,SPRN_MMUCFG + rlwinm r7,r7,21,28,31 /* extract MMUCFG[NPIDS] */ + cmpwi r7,3 + bne 2f /* skip if NPIDS != 3 */ + + mtspr SPRN_PID1,r6 + mtspr SPRN_PID2,r6 + +/* 5. Invalidate mapping we started in */ +2: + lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */ + rlwimi r7,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */ + mtspr SPRN_MAS0,r7 + tlbre + mfspr r6,SPRN_MAS1 + rlwinm r6,r6,0,2,0 /* clear IPROT */ + mtspr SPRN_MAS1,r6 + tlbwe + /* Invalidate TLB1 */ + li r9,0x0c + tlbivax 0,r9 + TLBSYNC + +#if defined(ENTRY_MAPPING_BOOT_SETUP) + +/* 6. Setup kernstart_virt_addr mapping in TLB1[0] */ + lis r6,0x1000 /* Set MAS0(TLBSEL) = TLB1(1), ESEL = 0 */ + mtspr SPRN_MAS0,r6 + lis r6,(MAS1_VALID|MAS1_IPROT)@h + ori r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_64M))@l + mtspr SPRN_MAS1,r6 + lis r6,MAS2_EPN_MASK(BOOK3E_PAGESZ_64M)@h + ori r6,r6,MAS2_EPN_MASK(BOOK3E_PAGESZ_64M)@l + and r6,r6,r20 + ori r6,r6,MAS2_M_IF_NEEDED@l + mtspr SPRN_MAS2,r6 + mtspr SPRN_MAS3,r8 + tlbwe + +/* 7. Jump to kernstart_virt_addr mapping */ + mr r6,r20 + +#elif defined(ENTRY_MAPPING_KEXEC_SETUP) +/* + * 6. Setup a 1:1 mapping in TLB1. Esel 0 is unsued, 1 or 2 contains the tmp + * mapping so we start at 3. We setup 8 mappings, each 256MiB in size. This + * will cover the first 2GiB of memory. + */ + + lis r10, (MAS1_VALID|MAS1_IPROT)@h + ori r10,r10, (MAS1_TSIZE(BOOK3E_PAGESZ_256M))@l + li r11, 0 + li r0, 8 + mtctr r0 + +next_tlb_setup: + addi r0, r11, 3 + rlwinm r0, r0, 16, 4, 15 // Compute esel + rlwinm r9, r11, 28, 0, 3 // Compute [ER]PN + oris r0, r0, (MAS0_TLBSEL(1))@h + mtspr SPRN_MAS0,r0 + mtspr SPRN_MAS1,r10 + mtspr SPRN_MAS2,r9 + ori r9, r9, (MAS3_SX|MAS3_SW|MAS3_SR) + mtspr SPRN_MAS3,r9 + tlbwe + addi r11, r11, 1 + bdnz+ next_tlb_setup + +/* 7. Jump to our 1:1 mapping */ + mr r6, r25 +#else + #error You need to specify the mapping or not use this at all. +#endif + + lis r7,MSR_KERNEL@h + ori r7,r7,MSR_KERNEL@l + bcl 20,31,$+4 /* Find our address */ +1: mflr r9 + rlwimi r6,r9,0,20,31 + addi r6,r6,(2f - 1b) + mtspr SPRN_SRR0,r6 + mtspr SPRN_SRR1,r7 + rfi /* start execution out of TLB1[0] entry */ + +/* 8. Clear out the temp mapping */ +2: lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */ + rlwimi r7,r5,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r5) */ + mtspr SPRN_MAS0,r7 + tlbre + mfspr r8,SPRN_MAS1 + rlwinm r8,r8,0,2,0 /* clear IPROT */ + mtspr SPRN_MAS1,r8 + tlbwe + /* Invalidate TLB1 */ + li r9,0x0c + tlbivax 0,r9 + TLBSYNC diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile new file mode 100644 index 000000000..9b6146056 --- /dev/null +++ b/arch/powerpc/kernel/Makefile @@ -0,0 +1,221 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for the linux kernel. +# + +ifdef CONFIG_PPC64 +CFLAGS_prom_init.o += $(NO_MINIMAL_TOC) +endif +ifdef CONFIG_PPC32 +CFLAGS_prom_init.o += -fPIC +CFLAGS_btext.o += -fPIC +endif + +CFLAGS_early_32.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) +CFLAGS_cputable.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) +CFLAGS_prom_init.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) +CFLAGS_btext.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) +CFLAGS_prom.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) + +CFLAGS_prom_init.o += -fno-stack-protector +CFLAGS_prom_init.o += -DDISABLE_BRANCH_PROFILING +CFLAGS_prom_init.o += -ffreestanding +CFLAGS_prom_init.o += $(call cc-option, -ftrivial-auto-var-init=uninitialized) + +ifdef CONFIG_FUNCTION_TRACER +# Do not trace early boot code +CFLAGS_REMOVE_cputable.o = $(CC_FLAGS_FTRACE) +CFLAGS_REMOVE_prom_init.o = $(CC_FLAGS_FTRACE) +CFLAGS_REMOVE_btext.o = $(CC_FLAGS_FTRACE) +CFLAGS_REMOVE_prom.o = $(CC_FLAGS_FTRACE) +endif + +KASAN_SANITIZE_early_32.o := n +KASAN_SANITIZE_cputable.o := n +KASAN_SANITIZE_prom_init.o := n +KASAN_SANITIZE_btext.o := n +KASAN_SANITIZE_paca.o := n +KASAN_SANITIZE_setup_64.o := n +KASAN_SANITIZE_mce.o := n +KASAN_SANITIZE_mce_power.o := n +KASAN_SANITIZE_udbg.o := n +KASAN_SANITIZE_udbg_16550.o := n + +# we have to be particularly careful in ppc64 to exclude code that +# runs with translations off, as we cannot access the shadow with +# translations off. However, ppc32 can sanitize this. +ifdef CONFIG_PPC64 +KASAN_SANITIZE_traps.o := n +endif + +ifdef CONFIG_KASAN +CFLAGS_early_32.o += -DDISABLE_BRANCH_PROFILING +CFLAGS_cputable.o += -DDISABLE_BRANCH_PROFILING +CFLAGS_btext.o += -DDISABLE_BRANCH_PROFILING +endif + +#ifdef CONFIG_RANDOMIZE_KSTACK_OFFSET +# Remove stack protector to avoid triggering unneeded stack canary +# checks due to randomize_kstack_offset. +CFLAGS_REMOVE_syscall.o = -fstack-protector -fstack-protector-strong +CFLAGS_syscall.o += -fno-stack-protector +#endif + +obj-y := cputable.o syscalls.o \ + irq.o align.o signal_$(BITS).o pmc.o vdso.o \ + process.o systbl.o idle.o \ + signal.o sysfs.o cacheinfo.o time.o \ + prom.o traps.o setup-common.o \ + udbg.o misc.o io.o misc_$(BITS).o \ + of_platform.o prom_parse.o firmware.o \ + hw_breakpoint_constraints.o interrupt.o \ + kdebugfs.o stacktrace.o syscall.o +obj-y += ptrace/ +obj-$(CONFIG_PPC64) += setup_64.o irq_64.o\ + paca.o nvram_64.o note.o +obj-$(CONFIG_PPC32) += sys_ppc32.o +obj-$(CONFIG_COMPAT) += sys_ppc32.o signal_32.o +obj-$(CONFIG_VDSO32) += vdso32_wrapper.o +obj-$(CONFIG_PPC_WATCHDOG) += watchdog.o +obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o +obj-$(CONFIG_PPC_DAWR) += dawr.o +obj-$(CONFIG_PPC_BOOK3S_64) += cpu_setup_ppc970.o cpu_setup_pa6t.o +obj-$(CONFIG_PPC_BOOK3S_64) += cpu_setup_power.o +obj-$(CONFIG_PPC_BOOK3S_64) += mce.o mce_power.o +obj-$(CONFIG_PPC_BOOK3E_64) += exceptions-64e.o idle_64e.o +obj-$(CONFIG_PPC_BARRIER_NOSPEC) += security.o +obj-$(CONFIG_PPC64) += vdso64_wrapper.o +obj-$(CONFIG_ALTIVEC) += vecemu.o +obj-$(CONFIG_PPC_BOOK3S_IDLE) += idle_book3s.o +procfs-y := proc_powerpc.o +obj-$(CONFIG_PROC_FS) += $(procfs-y) +rtaspci-$(CONFIG_PPC64)-$(CONFIG_PCI) := rtas_pci.o +obj-$(CONFIG_PPC_RTAS) += rtas_entry.o rtas.o rtas-rtc.o $(rtaspci-y-y) +obj-$(CONFIG_PPC_RTAS_DAEMON) += rtasd.o +obj-$(CONFIG_RTAS_FLASH) += rtas_flash.o +obj-$(CONFIG_RTAS_PROC) += rtas-proc.o +obj-$(CONFIG_PPC_DT_CPU_FTRS) += dt_cpu_ftrs.o +obj-$(CONFIG_EEH) += eeh.o eeh_pe.o eeh_cache.o \ + eeh_driver.o eeh_event.o eeh_sysfs.o +obj-$(CONFIG_GENERIC_TBSYNC) += smp-tbsync.o +obj-$(CONFIG_CRASH_DUMP) += crash_dump.o +obj-$(CONFIG_FA_DUMP) += fadump.o +obj-$(CONFIG_PRESERVE_FA_DUMP) += fadump.o +obj-$(CONFIG_PPC_85xx) += idle_85xx.o +obj-$(CONFIG_PPC_BOOK3S_32) += idle_6xx.o l2cr_6xx.o cpu_setup_6xx.o +obj-$(CONFIG_TAU) += tau_6xx.o +obj-$(CONFIG_HIBERNATION) += swsusp.o suspend.o +ifdef CONFIG_PPC_85xx +obj-$(CONFIG_HIBERNATION) += swsusp_85xx.o +else +obj-$(CONFIG_HIBERNATION) += swsusp_$(BITS).o +endif +obj64-$(CONFIG_HIBERNATION) += swsusp_asm64.o +obj-$(CONFIG_MODULES) += module.o module_$(BITS).o +obj-$(CONFIG_44x) += cpu_setup_44x.o +obj-$(CONFIG_PPC_E500) += cpu_setup_e500.o +obj-$(CONFIG_PPC_DOORBELL) += dbell.o +obj-$(CONFIG_JUMP_LABEL) += jump_label.o + +obj-$(CONFIG_PPC64) += head_64.o +obj-$(CONFIG_PPC_BOOK3S_32) += head_book3s_32.o +obj-$(CONFIG_40x) += head_40x.o +obj-$(CONFIG_44x) += head_44x.o +obj-$(CONFIG_PPC_8xx) += head_8xx.o +obj-$(CONFIG_PPC_85xx) += head_85xx.o +extra-y += vmlinux.lds + +obj-$(CONFIG_RELOCATABLE) += reloc_$(BITS).o + +obj-$(CONFIG_PPC32) += entry_32.o setup_32.o early_32.o static_call.o +obj-$(CONFIG_PPC64) += dma-iommu.o iommu.o +obj-$(CONFIG_KGDB) += kgdb.o +obj-$(CONFIG_BOOTX_TEXT) += btext.o +obj-$(CONFIG_SMP) += smp.o +obj-$(CONFIG_KPROBES) += kprobes.o +obj-$(CONFIG_OPTPROBES) += optprobes.o optprobes_head.o +obj-$(CONFIG_KPROBES_ON_FTRACE) += kprobes-ftrace.o +obj-$(CONFIG_UPROBES) += uprobes.o +obj-$(CONFIG_PPC_UDBG_16550) += legacy_serial.o udbg_16550.o +obj-$(CONFIG_SWIOTLB) += dma-swiotlb.o +obj-$(CONFIG_ARCH_HAS_DMA_SET_MASK) += dma-mask.o + +pci64-$(CONFIG_PPC64) += pci_dn.o pci-hotplug.o isa-bridge.o +obj-$(CONFIG_PCI) += pci_$(BITS).o $(pci64-y) \ + pci-common.o pci_of_scan.o +obj-$(CONFIG_PCI_MSI) += msi.o + +obj-$(CONFIG_AUDIT) += audit.o +obj64-$(CONFIG_AUDIT) += compat_audit.o + +obj-$(CONFIG_PPC_IO_WORKAROUNDS) += io-workarounds.o + +obj-y += trace/ + +ifneq ($(CONFIG_PPC_INDIRECT_PIO),y) +obj-y += iomap.o +endif + +obj64-$(CONFIG_PPC_TRANSACTIONAL_MEM) += tm.o + +obj-$(CONFIG_PPC64) += $(obj64-y) +obj-$(CONFIG_PPC32) += $(obj32-y) + +ifneq ($(CONFIG_XMON)$(CONFIG_KEXEC_CORE)(CONFIG_PPC_BOOK3S),) +obj-y += ppc_save_regs.o +endif + +obj-$(CONFIG_EPAPR_PARAVIRT) += epapr_paravirt.o epapr_hcalls.o +obj-$(CONFIG_KVM_GUEST) += kvm.o kvm_emul.o +ifneq ($(CONFIG_PPC_POWERNV)$(CONFIG_PPC_SVM),) +obj-y += ucall.o +endif + +obj-$(CONFIG_PPC_SECURE_BOOT) += secure_boot.o ima_arch.o secvar-ops.o +obj-$(CONFIG_PPC_SECVAR_SYSFS) += secvar-sysfs.o + +# Disable GCOV, KCOV & sanitizers in odd or sensitive code +GCOV_PROFILE_prom_init.o := n +KCOV_INSTRUMENT_prom_init.o := n +UBSAN_SANITIZE_prom_init.o := n +GCOV_PROFILE_kprobes.o := n +KCOV_INSTRUMENT_kprobes.o := n +UBSAN_SANITIZE_kprobes.o := n +GCOV_PROFILE_kprobes-ftrace.o := n +KCOV_INSTRUMENT_kprobes-ftrace.o := n +UBSAN_SANITIZE_kprobes-ftrace.o := n +GCOV_PROFILE_syscall_64.o := n +KCOV_INSTRUMENT_syscall_64.o := n +UBSAN_SANITIZE_syscall_64.o := n +UBSAN_SANITIZE_vdso.o := n + +# Necessary for booting with kcov enabled on book3e machines +KCOV_INSTRUMENT_cputable.o := n +KCOV_INSTRUMENT_setup_64.o := n +KCOV_INSTRUMENT_paca.o := n + +CFLAGS_setup_64.o += -fno-stack-protector +CFLAGS_paca.o += -fno-stack-protector + +obj-$(CONFIG_PPC_FPU) += fpu.o +obj-$(CONFIG_ALTIVEC) += vector.o +obj-$(CONFIG_PPC64) += entry_64.o +obj-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE) += prom_init.o + +extra-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE) += prom_init_check + +quiet_cmd_prom_init_check = PROMCHK $@ + cmd_prom_init_check = $(CONFIG_SHELL) $< "$(NM)" $(obj)/prom_init.o; touch $@ + +$(obj)/prom_init_check: $(src)/prom_init_check.sh $(obj)/prom_init.o FORCE + $(call if_changed,prom_init_check) +targets += prom_init_check + +clean-files := vmlinux.lds + +# Force dependency (incbin is bad) +$(obj)/vdso32_wrapper.o : $(obj)/vdso/vdso32.so.dbg +$(obj)/vdso64_wrapper.o : $(obj)/vdso/vdso64.so.dbg + +# for cleaning +subdir- += vdso diff --git a/arch/powerpc/kernel/align.c b/arch/powerpc/kernel/align.c new file mode 100644 index 000000000..3e37ece06 --- /dev/null +++ b/arch/powerpc/kernel/align.c @@ -0,0 +1,364 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* align.c - handle alignment exceptions for the Power PC. + * + * Copyright (c) 1996 Paul Mackerras <paulus@cs.anu.edu.au> + * Copyright (c) 1998-1999 TiVo, Inc. + * PowerPC 403GCX modifications. + * Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu> + * PowerPC 403GCX/405GP modifications. + * Copyright (c) 2001-2002 PPC64 team, IBM Corp + * 64-bit and Power4 support + * Copyright (c) 2005 Benjamin Herrenschmidt, IBM Corp + * <benh@kernel.crashing.org> + * Merge ppc32 and ppc64 implementations + */ + +#include <linux/kernel.h> +#include <linux/mm.h> +#include <asm/processor.h> +#include <linux/uaccess.h> +#include <asm/cache.h> +#include <asm/cputable.h> +#include <asm/emulated_ops.h> +#include <asm/switch_to.h> +#include <asm/disassemble.h> +#include <asm/cpu_has_feature.h> +#include <asm/sstep.h> +#include <asm/inst.h> + +struct aligninfo { + unsigned char len; + unsigned char flags; +}; + + +#define INVALID { 0, 0 } + +/* Bits in the flags field */ +#define LD 0 /* load */ +#define ST 1 /* store */ +#define SE 2 /* sign-extend value, or FP ld/st as word */ +#define SW 0x20 /* byte swap */ +#define E4 0x40 /* SPE endianness is word */ +#define E8 0x80 /* SPE endianness is double word */ + +#ifdef CONFIG_SPE + +static struct aligninfo spe_aligninfo[32] = { + { 8, LD+E8 }, /* 0 00 00: evldd[x] */ + { 8, LD+E4 }, /* 0 00 01: evldw[x] */ + { 8, LD }, /* 0 00 10: evldh[x] */ + INVALID, /* 0 00 11 */ + { 2, LD }, /* 0 01 00: evlhhesplat[x] */ + INVALID, /* 0 01 01 */ + { 2, LD }, /* 0 01 10: evlhhousplat[x] */ + { 2, LD+SE }, /* 0 01 11: evlhhossplat[x] */ + { 4, LD }, /* 0 10 00: evlwhe[x] */ + INVALID, /* 0 10 01 */ + { 4, LD }, /* 0 10 10: evlwhou[x] */ + { 4, LD+SE }, /* 0 10 11: evlwhos[x] */ + { 4, LD+E4 }, /* 0 11 00: evlwwsplat[x] */ + INVALID, /* 0 11 01 */ + { 4, LD }, /* 0 11 10: evlwhsplat[x] */ + INVALID, /* 0 11 11 */ + + { 8, ST+E8 }, /* 1 00 00: evstdd[x] */ + { 8, ST+E4 }, /* 1 00 01: evstdw[x] */ + { 8, ST }, /* 1 00 10: evstdh[x] */ + INVALID, /* 1 00 11 */ + INVALID, /* 1 01 00 */ + INVALID, /* 1 01 01 */ + INVALID, /* 1 01 10 */ + INVALID, /* 1 01 11 */ + { 4, ST }, /* 1 10 00: evstwhe[x] */ + INVALID, /* 1 10 01 */ + { 4, ST }, /* 1 10 10: evstwho[x] */ + INVALID, /* 1 10 11 */ + { 4, ST+E4 }, /* 1 11 00: evstwwe[x] */ + INVALID, /* 1 11 01 */ + { 4, ST+E4 }, /* 1 11 10: evstwwo[x] */ + INVALID, /* 1 11 11 */ +}; + +#define EVLDD 0x00 +#define EVLDW 0x01 +#define EVLDH 0x02 +#define EVLHHESPLAT 0x04 +#define EVLHHOUSPLAT 0x06 +#define EVLHHOSSPLAT 0x07 +#define EVLWHE 0x08 +#define EVLWHOU 0x0A +#define EVLWHOS 0x0B +#define EVLWWSPLAT 0x0C +#define EVLWHSPLAT 0x0E +#define EVSTDD 0x10 +#define EVSTDW 0x11 +#define EVSTDH 0x12 +#define EVSTWHE 0x18 +#define EVSTWHO 0x1A +#define EVSTWWE 0x1C +#define EVSTWWO 0x1E + +/* + * Emulate SPE loads and stores. + * Only Book-E has these instructions, and it does true little-endian, + * so we don't need the address swizzling. + */ +static int emulate_spe(struct pt_regs *regs, unsigned int reg, + ppc_inst_t ppc_instr) +{ + union { + u64 ll; + u32 w[2]; + u16 h[4]; + u8 v[8]; + } data, temp; + unsigned char __user *p, *addr; + unsigned long *evr = ¤t->thread.evr[reg]; + unsigned int nb, flags, instr; + + instr = ppc_inst_val(ppc_instr); + instr = (instr >> 1) & 0x1f; + + /* DAR has the operand effective address */ + addr = (unsigned char __user *)regs->dar; + + nb = spe_aligninfo[instr].len; + flags = spe_aligninfo[instr].flags; + + /* userland only */ + if (unlikely(!user_mode(regs))) + return 0; + + flush_spe_to_thread(current); + + /* If we are loading, get the data from user space, else + * get it from register values + */ + if (flags & ST) { + data.ll = 0; + switch (instr) { + case EVSTDD: + case EVSTDW: + case EVSTDH: + data.w[0] = *evr; + data.w[1] = regs->gpr[reg]; + break; + case EVSTWHE: + data.h[2] = *evr >> 16; + data.h[3] = regs->gpr[reg] >> 16; + break; + case EVSTWHO: + data.h[2] = *evr & 0xffff; + data.h[3] = regs->gpr[reg] & 0xffff; + break; + case EVSTWWE: + data.w[1] = *evr; + break; + case EVSTWWO: + data.w[1] = regs->gpr[reg]; + break; + default: + return -EINVAL; + } + } else { + temp.ll = data.ll = 0; + p = addr; + + if (!user_read_access_begin(addr, nb)) + return -EFAULT; + + switch (nb) { + case 8: + unsafe_get_user(temp.v[0], p++, Efault_read); + unsafe_get_user(temp.v[1], p++, Efault_read); + unsafe_get_user(temp.v[2], p++, Efault_read); + unsafe_get_user(temp.v[3], p++, Efault_read); + fallthrough; + case 4: + unsafe_get_user(temp.v[4], p++, Efault_read); + unsafe_get_user(temp.v[5], p++, Efault_read); + fallthrough; + case 2: + unsafe_get_user(temp.v[6], p++, Efault_read); + unsafe_get_user(temp.v[7], p++, Efault_read); + } + user_read_access_end(); + + switch (instr) { + case EVLDD: + case EVLDW: + case EVLDH: + data.ll = temp.ll; + break; + case EVLHHESPLAT: + data.h[0] = temp.h[3]; + data.h[2] = temp.h[3]; + break; + case EVLHHOUSPLAT: + case EVLHHOSSPLAT: + data.h[1] = temp.h[3]; + data.h[3] = temp.h[3]; + break; + case EVLWHE: + data.h[0] = temp.h[2]; + data.h[2] = temp.h[3]; + break; + case EVLWHOU: + case EVLWHOS: + data.h[1] = temp.h[2]; + data.h[3] = temp.h[3]; + break; + case EVLWWSPLAT: + data.w[0] = temp.w[1]; + data.w[1] = temp.w[1]; + break; + case EVLWHSPLAT: + data.h[0] = temp.h[2]; + data.h[1] = temp.h[2]; + data.h[2] = temp.h[3]; + data.h[3] = temp.h[3]; + break; + default: + return -EINVAL; + } + } + + if (flags & SW) { + switch (flags & 0xf0) { + case E8: + data.ll = swab64(data.ll); + break; + case E4: + data.w[0] = swab32(data.w[0]); + data.w[1] = swab32(data.w[1]); + break; + /* Its half word endian */ + default: + data.h[0] = swab16(data.h[0]); + data.h[1] = swab16(data.h[1]); + data.h[2] = swab16(data.h[2]); + data.h[3] = swab16(data.h[3]); + break; + } + } + + if (flags & SE) { + data.w[0] = (s16)data.h[1]; + data.w[1] = (s16)data.h[3]; + } + + /* Store result to memory or update registers */ + if (flags & ST) { + p = addr; + + if (!user_write_access_begin(addr, nb)) + return -EFAULT; + + switch (nb) { + case 8: + unsafe_put_user(data.v[0], p++, Efault_write); + unsafe_put_user(data.v[1], p++, Efault_write); + unsafe_put_user(data.v[2], p++, Efault_write); + unsafe_put_user(data.v[3], p++, Efault_write); + fallthrough; + case 4: + unsafe_put_user(data.v[4], p++, Efault_write); + unsafe_put_user(data.v[5], p++, Efault_write); + fallthrough; + case 2: + unsafe_put_user(data.v[6], p++, Efault_write); + unsafe_put_user(data.v[7], p++, Efault_write); + } + user_write_access_end(); + } else { + *evr = data.w[0]; + regs->gpr[reg] = data.w[1]; + } + + return 1; + +Efault_read: + user_read_access_end(); + return -EFAULT; + +Efault_write: + user_write_access_end(); + return -EFAULT; +} +#endif /* CONFIG_SPE */ + +/* + * Called on alignment exception. Attempts to fixup + * + * Return 1 on success + * Return 0 if unable to handle the interrupt + * Return -EFAULT if data address is bad + * Other negative return values indicate that the instruction can't + * be emulated, and the process should be given a SIGBUS. + */ + +int fix_alignment(struct pt_regs *regs) +{ + ppc_inst_t instr; + struct instruction_op op; + int r, type; + + if (is_kernel_addr(regs->nip)) + r = copy_inst_from_kernel_nofault(&instr, (void *)regs->nip); + else + r = __get_user_instr(instr, (void __user *)regs->nip); + + if (unlikely(r)) + return -EFAULT; + if ((regs->msr & MSR_LE) != (MSR_KERNEL & MSR_LE)) { + /* We don't handle PPC little-endian any more... */ + if (cpu_has_feature(CPU_FTR_PPC_LE)) + return -EIO; + instr = ppc_inst_swab(instr); + } + +#ifdef CONFIG_SPE + if (ppc_inst_primary_opcode(instr) == 0x4) { + int reg = (ppc_inst_val(instr) >> 21) & 0x1f; + PPC_WARN_ALIGNMENT(spe, regs); + return emulate_spe(regs, reg, instr); + } +#endif + + + /* + * ISA 3.0 (such as P9) copy, copy_first, paste and paste_last alignment + * check. + * + * Send a SIGBUS to the process that caused the fault. + * + * We do not emulate these because paste may contain additional metadata + * when pasting to a co-processor. Furthermore, paste_last is the + * synchronisation point for preceding copy/paste sequences. + */ + if ((ppc_inst_val(instr) & 0xfc0006fe) == (PPC_INST_COPY & 0xfc0006fe)) + return -EIO; + + r = analyse_instr(&op, regs, instr); + if (r < 0) + return -EINVAL; + + type = GETTYPE(op.type); + if (!OP_IS_LOAD_STORE(type)) { + if (op.type != CACHEOP + DCBZ) + return -EINVAL; + PPC_WARN_ALIGNMENT(dcbz, regs); + WARN_ON_ONCE(!user_mode(regs)); + r = emulate_dcbz(op.ea, regs); + } else { + if (type == LARX || type == STCX) + return -EIO; + PPC_WARN_ALIGNMENT(unaligned, regs); + r = emulate_loadstore(regs, &op); + } + + if (!r) + return 1; + return r; +} diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c new file mode 100644 index 000000000..4ce2a4aa3 --- /dev/null +++ b/arch/powerpc/kernel/asm-offsets.c @@ -0,0 +1,704 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * This program is used to generate definitions needed by + * assembly language modules. + * + * We use the technique used in the OSF Mach kernel code: + * generate asm statements containing #defines, + * compile this file to assembler, and then extract the + * #defines from the assembly-language output. + */ + +#include <linux/compat.h> +#include <linux/signal.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/mman.h> +#include <linux/mm.h> +#include <linux/suspend.h> +#include <linux/hrtimer.h> +#ifdef CONFIG_PPC64 +#include <linux/time.h> +#include <linux/hardirq.h> +#endif +#include <linux/kbuild.h> + +#include <asm/io.h> +#include <asm/page.h> +#include <asm/processor.h> +#include <asm/cputable.h> +#include <asm/thread_info.h> +#include <asm/rtas.h> +#include <asm/vdso_datapage.h> +#include <asm/dbell.h> +#ifdef CONFIG_PPC64 +#include <asm/paca.h> +#include <asm/lppaca.h> +#include <asm/cache.h> +#include <asm/mmu.h> +#include <asm/hvcall.h> +#include <asm/xics.h> +#endif +#ifdef CONFIG_PPC_POWERNV +#include <asm/opal.h> +#endif +#if defined(CONFIG_KVM) || defined(CONFIG_KVM_GUEST) +#include <linux/kvm_host.h> +#endif +#if defined(CONFIG_KVM) && defined(CONFIG_PPC_BOOK3S) +#include <asm/kvm_book3s.h> +#include <asm/kvm_ppc.h> +#endif + +#ifdef CONFIG_PPC32 +#ifdef CONFIG_BOOKE_OR_40x +#include "head_booke.h" +#endif +#endif + +#if defined(CONFIG_PPC_E500) +#include "../mm/mmu_decl.h" +#endif + +#ifdef CONFIG_PPC_8xx +#include <asm/fixmap.h> +#endif + +#ifdef CONFIG_XMON +#include "../xmon/xmon_bpts.h" +#endif + +#define STACK_PT_REGS_OFFSET(sym, val) \ + DEFINE(sym, STACK_FRAME_OVERHEAD + offsetof(struct pt_regs, val)) + +int main(void) +{ + OFFSET(THREAD, task_struct, thread); + OFFSET(MM, task_struct, mm); +#ifdef CONFIG_STACKPROTECTOR + OFFSET(TASK_CANARY, task_struct, stack_canary); +#ifdef CONFIG_PPC64 + OFFSET(PACA_CANARY, paca_struct, canary); +#endif +#endif +#ifdef CONFIG_PPC32 +#ifdef CONFIG_PPC_RTAS + OFFSET(RTAS_SP, thread_struct, rtas_sp); +#endif +#endif /* CONFIG_PPC64 */ + OFFSET(TASK_STACK, task_struct, stack); +#ifdef CONFIG_SMP + OFFSET(TASK_CPU, task_struct, thread_info.cpu); +#endif + +#ifdef CONFIG_LIVEPATCH_64 + OFFSET(TI_livepatch_sp, thread_info, livepatch_sp); +#endif + + OFFSET(KSP, thread_struct, ksp); + OFFSET(PT_REGS, thread_struct, regs); +#ifdef CONFIG_BOOKE + OFFSET(THREAD_NORMSAVES, thread_struct, normsave[0]); +#endif +#ifdef CONFIG_PPC_FPU + OFFSET(THREAD_FPEXC_MODE, thread_struct, fpexc_mode); + OFFSET(THREAD_FPSTATE, thread_struct, fp_state.fpr); + OFFSET(THREAD_FPSAVEAREA, thread_struct, fp_save_area); +#endif + OFFSET(FPSTATE_FPSCR, thread_fp_state, fpscr); + OFFSET(THREAD_LOAD_FP, thread_struct, load_fp); +#ifdef CONFIG_ALTIVEC + OFFSET(THREAD_VRSTATE, thread_struct, vr_state.vr); + OFFSET(THREAD_VRSAVEAREA, thread_struct, vr_save_area); + OFFSET(THREAD_USED_VR, thread_struct, used_vr); + OFFSET(VRSTATE_VSCR, thread_vr_state, vscr); + OFFSET(THREAD_LOAD_VEC, thread_struct, load_vec); +#endif /* CONFIG_ALTIVEC */ +#ifdef CONFIG_VSX + OFFSET(THREAD_USED_VSR, thread_struct, used_vsr); +#endif /* CONFIG_VSX */ +#ifdef CONFIG_PPC64 + OFFSET(KSP_VSID, thread_struct, ksp_vsid); +#else /* CONFIG_PPC64 */ + OFFSET(PGDIR, thread_struct, pgdir); + OFFSET(SRR0, thread_struct, srr0); + OFFSET(SRR1, thread_struct, srr1); + OFFSET(DAR, thread_struct, dar); + OFFSET(DSISR, thread_struct, dsisr); +#ifdef CONFIG_PPC_BOOK3S_32 + OFFSET(THR0, thread_struct, r0); + OFFSET(THR3, thread_struct, r3); + OFFSET(THR4, thread_struct, r4); + OFFSET(THR5, thread_struct, r5); + OFFSET(THR6, thread_struct, r6); + OFFSET(THR8, thread_struct, r8); + OFFSET(THR9, thread_struct, r9); + OFFSET(THR11, thread_struct, r11); + OFFSET(THLR, thread_struct, lr); + OFFSET(THCTR, thread_struct, ctr); + OFFSET(THSR0, thread_struct, sr0); +#endif +#ifdef CONFIG_SPE + OFFSET(THREAD_EVR0, thread_struct, evr[0]); + OFFSET(THREAD_ACC, thread_struct, acc); + OFFSET(THREAD_USED_SPE, thread_struct, used_spe); +#endif /* CONFIG_SPE */ +#endif /* CONFIG_PPC64 */ +#ifdef CONFIG_KVM_BOOK3S_32_HANDLER + OFFSET(THREAD_KVM_SVCPU, thread_struct, kvm_shadow_vcpu); +#endif +#if defined(CONFIG_KVM) && defined(CONFIG_BOOKE) + OFFSET(THREAD_KVM_VCPU, thread_struct, kvm_vcpu); +#endif + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + OFFSET(PACATMSCRATCH, paca_struct, tm_scratch); + OFFSET(THREAD_TM_TFHAR, thread_struct, tm_tfhar); + OFFSET(THREAD_TM_TEXASR, thread_struct, tm_texasr); + OFFSET(THREAD_TM_TFIAR, thread_struct, tm_tfiar); + OFFSET(THREAD_TM_TAR, thread_struct, tm_tar); + OFFSET(THREAD_TM_PPR, thread_struct, tm_ppr); + OFFSET(THREAD_TM_DSCR, thread_struct, tm_dscr); + OFFSET(THREAD_TM_AMR, thread_struct, tm_amr); + OFFSET(PT_CKPT_REGS, thread_struct, ckpt_regs); + OFFSET(THREAD_CKVRSTATE, thread_struct, ckvr_state.vr); + OFFSET(THREAD_CKVRSAVE, thread_struct, ckvrsave); + OFFSET(THREAD_CKFPSTATE, thread_struct, ckfp_state.fpr); + /* Local pt_regs on stack for Transactional Memory funcs. */ + DEFINE(TM_FRAME_SIZE, STACK_FRAME_OVERHEAD + + sizeof(struct pt_regs) + 16); +#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ + + OFFSET(TI_LOCAL_FLAGS, thread_info, local_flags); + +#ifdef CONFIG_PPC64 + OFFSET(DCACHEL1BLOCKSIZE, ppc64_caches, l1d.block_size); + OFFSET(DCACHEL1LOGBLOCKSIZE, ppc64_caches, l1d.log_block_size); + /* paca */ + OFFSET(PACAPACAINDEX, paca_struct, paca_index); + OFFSET(PACAPROCSTART, paca_struct, cpu_start); + OFFSET(PACAKSAVE, paca_struct, kstack); + OFFSET(PACACURRENT, paca_struct, __current); + DEFINE(PACA_THREAD_INFO, offsetof(struct paca_struct, __current) + + offsetof(struct task_struct, thread_info)); + OFFSET(PACASAVEDMSR, paca_struct, saved_msr); + OFFSET(PACAR1, paca_struct, saved_r1); + OFFSET(PACATOC, paca_struct, kernel_toc); + OFFSET(PACAKBASE, paca_struct, kernelbase); + OFFSET(PACAKMSR, paca_struct, kernel_msr); +#ifdef CONFIG_PPC_BOOK3S_64 + OFFSET(PACAHSRR_VALID, paca_struct, hsrr_valid); + OFFSET(PACASRR_VALID, paca_struct, srr_valid); +#endif + OFFSET(PACAIRQSOFTMASK, paca_struct, irq_soft_mask); + OFFSET(PACAIRQHAPPENED, paca_struct, irq_happened); + OFFSET(PACA_FTRACE_ENABLED, paca_struct, ftrace_enabled); + +#ifdef CONFIG_PPC_BOOK3E_64 + OFFSET(PACAPGD, paca_struct, pgd); + OFFSET(PACA_KERNELPGD, paca_struct, kernel_pgd); + OFFSET(PACA_EXGEN, paca_struct, exgen); + OFFSET(PACA_EXTLB, paca_struct, extlb); + OFFSET(PACA_EXMC, paca_struct, exmc); + OFFSET(PACA_EXCRIT, paca_struct, excrit); + OFFSET(PACA_EXDBG, paca_struct, exdbg); + OFFSET(PACA_MC_STACK, paca_struct, mc_kstack); + OFFSET(PACA_CRIT_STACK, paca_struct, crit_kstack); + OFFSET(PACA_DBG_STACK, paca_struct, dbg_kstack); + OFFSET(PACA_TCD_PTR, paca_struct, tcd_ptr); + + OFFSET(TCD_ESEL_NEXT, tlb_core_data, esel_next); + OFFSET(TCD_ESEL_MAX, tlb_core_data, esel_max); + OFFSET(TCD_ESEL_FIRST, tlb_core_data, esel_first); +#endif /* CONFIG_PPC_BOOK3E_64 */ + +#ifdef CONFIG_PPC_BOOK3S_64 + OFFSET(PACA_EXGEN, paca_struct, exgen); + OFFSET(PACA_EXMC, paca_struct, exmc); + OFFSET(PACA_EXNMI, paca_struct, exnmi); +#ifdef CONFIG_PPC_64S_HASH_MMU + OFFSET(PACA_SLBSHADOWPTR, paca_struct, slb_shadow_ptr); + OFFSET(SLBSHADOW_STACKVSID, slb_shadow, save_area[SLB_NUM_BOLTED - 1].vsid); + OFFSET(SLBSHADOW_STACKESID, slb_shadow, save_area[SLB_NUM_BOLTED - 1].esid); + OFFSET(SLBSHADOW_SAVEAREA, slb_shadow, save_area); +#endif + OFFSET(LPPACA_PMCINUSE, lppaca, pmcregs_in_use); +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE + OFFSET(PACA_PMCINUSE, paca_struct, pmcregs_in_use); +#endif + OFFSET(LPPACA_YIELDCOUNT, lppaca, yield_count); +#endif /* CONFIG_PPC_BOOK3S_64 */ + OFFSET(PACAEMERGSP, paca_struct, emergency_sp); +#ifdef CONFIG_PPC_BOOK3S_64 + OFFSET(PACAMCEMERGSP, paca_struct, mc_emergency_sp); + OFFSET(PACA_NMI_EMERG_SP, paca_struct, nmi_emergency_sp); + OFFSET(PACA_IN_MCE, paca_struct, in_mce); + OFFSET(PACA_IN_NMI, paca_struct, in_nmi); + OFFSET(PACA_RFI_FLUSH_FALLBACK_AREA, paca_struct, rfi_flush_fallback_area); + OFFSET(PACA_EXRFI, paca_struct, exrfi); + OFFSET(PACA_L1D_FLUSH_SIZE, paca_struct, l1d_flush_size); + +#endif + OFFSET(PACAHWCPUID, paca_struct, hw_cpu_id); + OFFSET(PACAKEXECSTATE, paca_struct, kexec_state); + OFFSET(PACA_DSCR_DEFAULT, paca_struct, dscr_default); +#ifdef CONFIG_PPC64 + OFFSET(PACA_EXIT_SAVE_R1, paca_struct, exit_save_r1); +#endif +#ifdef CONFIG_PPC_BOOK3E_64 + OFFSET(PACA_TRAP_SAVE, paca_struct, trap_save); +#endif + OFFSET(PACA_SPRG_VDSO, paca_struct, sprg_vdso); +#else /* CONFIG_PPC64 */ +#endif /* CONFIG_PPC64 */ + + /* RTAS */ + OFFSET(RTASBASE, rtas_t, base); + OFFSET(RTASENTRY, rtas_t, entry); + + /* Interrupt register frame */ + DEFINE(INT_FRAME_SIZE, STACK_INT_FRAME_SIZE); + DEFINE(SWITCH_FRAME_SIZE, STACK_FRAME_WITH_PT_REGS); + STACK_PT_REGS_OFFSET(GPR0, gpr[0]); + STACK_PT_REGS_OFFSET(GPR1, gpr[1]); + STACK_PT_REGS_OFFSET(GPR2, gpr[2]); + STACK_PT_REGS_OFFSET(GPR3, gpr[3]); + STACK_PT_REGS_OFFSET(GPR4, gpr[4]); + STACK_PT_REGS_OFFSET(GPR5, gpr[5]); + STACK_PT_REGS_OFFSET(GPR6, gpr[6]); + STACK_PT_REGS_OFFSET(GPR7, gpr[7]); + STACK_PT_REGS_OFFSET(GPR8, gpr[8]); + STACK_PT_REGS_OFFSET(GPR9, gpr[9]); + STACK_PT_REGS_OFFSET(GPR10, gpr[10]); + STACK_PT_REGS_OFFSET(GPR11, gpr[11]); + STACK_PT_REGS_OFFSET(GPR12, gpr[12]); + STACK_PT_REGS_OFFSET(GPR13, gpr[13]); + /* + * Note: these symbols include _ because they overlap with special + * register names + */ + STACK_PT_REGS_OFFSET(_NIP, nip); + STACK_PT_REGS_OFFSET(_MSR, msr); + STACK_PT_REGS_OFFSET(_CTR, ctr); + STACK_PT_REGS_OFFSET(_LINK, link); + STACK_PT_REGS_OFFSET(_CCR, ccr); + STACK_PT_REGS_OFFSET(_XER, xer); + STACK_PT_REGS_OFFSET(_DAR, dar); + STACK_PT_REGS_OFFSET(_DEAR, dear); + STACK_PT_REGS_OFFSET(_DSISR, dsisr); + STACK_PT_REGS_OFFSET(_ESR, esr); + STACK_PT_REGS_OFFSET(ORIG_GPR3, orig_gpr3); + STACK_PT_REGS_OFFSET(RESULT, result); + STACK_PT_REGS_OFFSET(_TRAP, trap); +#ifdef CONFIG_PPC64 + STACK_PT_REGS_OFFSET(SOFTE, softe); + STACK_PT_REGS_OFFSET(_PPR, ppr); +#endif + +#ifdef CONFIG_PPC_PKEY + STACK_PT_REGS_OFFSET(STACK_REGS_AMR, amr); + STACK_PT_REGS_OFFSET(STACK_REGS_IAMR, iamr); +#endif + +#if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE) + STACK_PT_REGS_OFFSET(MAS0, mas0); + /* we overload MMUCR for 44x on MAS0 since they are mutually exclusive */ + STACK_PT_REGS_OFFSET(MMUCR, mas0); + STACK_PT_REGS_OFFSET(MAS1, mas1); + STACK_PT_REGS_OFFSET(MAS2, mas2); + STACK_PT_REGS_OFFSET(MAS3, mas3); + STACK_PT_REGS_OFFSET(MAS6, mas6); + STACK_PT_REGS_OFFSET(MAS7, mas7); + STACK_PT_REGS_OFFSET(_SRR0, srr0); + STACK_PT_REGS_OFFSET(_SRR1, srr1); + STACK_PT_REGS_OFFSET(_CSRR0, csrr0); + STACK_PT_REGS_OFFSET(_CSRR1, csrr1); + STACK_PT_REGS_OFFSET(_DSRR0, dsrr0); + STACK_PT_REGS_OFFSET(_DSRR1, dsrr1); +#endif + + /* About the CPU features table */ + OFFSET(CPU_SPEC_FEATURES, cpu_spec, cpu_features); + OFFSET(CPU_SPEC_SETUP, cpu_spec, cpu_setup); + OFFSET(CPU_SPEC_RESTORE, cpu_spec, cpu_restore); + + OFFSET(pbe_address, pbe, address); + OFFSET(pbe_orig_address, pbe, orig_address); + OFFSET(pbe_next, pbe, next); + +#ifndef CONFIG_PPC64 + DEFINE(TASK_SIZE, TASK_SIZE); + DEFINE(NUM_USER_SEGMENTS, TASK_SIZE>>28); +#endif /* ! CONFIG_PPC64 */ + + /* datapage offsets for use by vdso */ + OFFSET(VDSO_DATA_OFFSET, vdso_arch_data, data); + OFFSET(CFG_TB_TICKS_PER_SEC, vdso_arch_data, tb_ticks_per_sec); +#ifdef CONFIG_PPC64 + OFFSET(CFG_ICACHE_BLOCKSZ, vdso_arch_data, icache_block_size); + OFFSET(CFG_DCACHE_BLOCKSZ, vdso_arch_data, dcache_block_size); + OFFSET(CFG_ICACHE_LOGBLOCKSZ, vdso_arch_data, icache_log_block_size); + OFFSET(CFG_DCACHE_LOGBLOCKSZ, vdso_arch_data, dcache_log_block_size); + OFFSET(CFG_SYSCALL_MAP64, vdso_arch_data, syscall_map); + OFFSET(CFG_SYSCALL_MAP32, vdso_arch_data, compat_syscall_map); +#else + OFFSET(CFG_SYSCALL_MAP32, vdso_arch_data, syscall_map); +#endif + +#ifdef CONFIG_BUG + DEFINE(BUG_ENTRY_SIZE, sizeof(struct bug_entry)); +#endif + +#ifdef CONFIG_KVM + OFFSET(VCPU_HOST_STACK, kvm_vcpu, arch.host_stack); + OFFSET(VCPU_HOST_PID, kvm_vcpu, arch.host_pid); + OFFSET(VCPU_GUEST_PID, kvm_vcpu, arch.pid); + OFFSET(VCPU_GPRS, kvm_vcpu, arch.regs.gpr); + OFFSET(VCPU_VRSAVE, kvm_vcpu, arch.vrsave); + OFFSET(VCPU_FPRS, kvm_vcpu, arch.fp.fpr); +#ifdef CONFIG_ALTIVEC + OFFSET(VCPU_VRS, kvm_vcpu, arch.vr.vr); +#endif + OFFSET(VCPU_XER, kvm_vcpu, arch.regs.xer); + OFFSET(VCPU_CTR, kvm_vcpu, arch.regs.ctr); + OFFSET(VCPU_LR, kvm_vcpu, arch.regs.link); +#ifdef CONFIG_PPC_BOOK3S + OFFSET(VCPU_TAR, kvm_vcpu, arch.tar); +#endif + OFFSET(VCPU_CR, kvm_vcpu, arch.regs.ccr); + OFFSET(VCPU_PC, kvm_vcpu, arch.regs.nip); +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE + OFFSET(VCPU_MSR, kvm_vcpu, arch.shregs.msr); + OFFSET(VCPU_SRR0, kvm_vcpu, arch.shregs.srr0); + OFFSET(VCPU_SRR1, kvm_vcpu, arch.shregs.srr1); + OFFSET(VCPU_SPRG0, kvm_vcpu, arch.shregs.sprg0); + OFFSET(VCPU_SPRG1, kvm_vcpu, arch.shregs.sprg1); + OFFSET(VCPU_SPRG2, kvm_vcpu, arch.shregs.sprg2); + OFFSET(VCPU_SPRG3, kvm_vcpu, arch.shregs.sprg3); +#endif +#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING + OFFSET(VCPU_TB_RMENTRY, kvm_vcpu, arch.rm_entry); + OFFSET(VCPU_TB_RMINTR, kvm_vcpu, arch.rm_intr); + OFFSET(VCPU_TB_RMEXIT, kvm_vcpu, arch.rm_exit); + OFFSET(VCPU_TB_GUEST, kvm_vcpu, arch.guest_time); + OFFSET(VCPU_TB_CEDE, kvm_vcpu, arch.cede_time); + OFFSET(VCPU_CUR_ACTIVITY, kvm_vcpu, arch.cur_activity); + OFFSET(VCPU_ACTIVITY_START, kvm_vcpu, arch.cur_tb_start); + OFFSET(TAS_SEQCOUNT, kvmhv_tb_accumulator, seqcount); + OFFSET(TAS_TOTAL, kvmhv_tb_accumulator, tb_total); + OFFSET(TAS_MIN, kvmhv_tb_accumulator, tb_min); + OFFSET(TAS_MAX, kvmhv_tb_accumulator, tb_max); +#endif + OFFSET(VCPU_SHARED_SPRG3, kvm_vcpu_arch_shared, sprg3); + OFFSET(VCPU_SHARED_SPRG4, kvm_vcpu_arch_shared, sprg4); + OFFSET(VCPU_SHARED_SPRG5, kvm_vcpu_arch_shared, sprg5); + OFFSET(VCPU_SHARED_SPRG6, kvm_vcpu_arch_shared, sprg6); + OFFSET(VCPU_SHARED_SPRG7, kvm_vcpu_arch_shared, sprg7); + OFFSET(VCPU_SHADOW_PID, kvm_vcpu, arch.shadow_pid); + OFFSET(VCPU_SHADOW_PID1, kvm_vcpu, arch.shadow_pid1); + OFFSET(VCPU_SHARED, kvm_vcpu, arch.shared); + OFFSET(VCPU_SHARED_MSR, kvm_vcpu_arch_shared, msr); + OFFSET(VCPU_SHADOW_MSR, kvm_vcpu, arch.shadow_msr); +#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_KVM_BOOK3S_PR_POSSIBLE) + OFFSET(VCPU_SHAREDBE, kvm_vcpu, arch.shared_big_endian); +#endif + + OFFSET(VCPU_SHARED_MAS0, kvm_vcpu_arch_shared, mas0); + OFFSET(VCPU_SHARED_MAS1, kvm_vcpu_arch_shared, mas1); + OFFSET(VCPU_SHARED_MAS2, kvm_vcpu_arch_shared, mas2); + OFFSET(VCPU_SHARED_MAS7_3, kvm_vcpu_arch_shared, mas7_3); + OFFSET(VCPU_SHARED_MAS4, kvm_vcpu_arch_shared, mas4); + OFFSET(VCPU_SHARED_MAS6, kvm_vcpu_arch_shared, mas6); + + OFFSET(VCPU_KVM, kvm_vcpu, kvm); + OFFSET(KVM_LPID, kvm, arch.lpid); + + /* book3s */ +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE + OFFSET(KVM_TLB_SETS, kvm, arch.tlb_sets); + OFFSET(KVM_SDR1, kvm, arch.sdr1); + OFFSET(KVM_HOST_LPID, kvm, arch.host_lpid); + OFFSET(KVM_HOST_LPCR, kvm, arch.host_lpcr); + OFFSET(KVM_HOST_SDR1, kvm, arch.host_sdr1); + OFFSET(KVM_ENABLED_HCALLS, kvm, arch.enabled_hcalls); + OFFSET(KVM_VRMA_SLB_V, kvm, arch.vrma_slb_v); + OFFSET(KVM_RADIX, kvm, arch.radix); + OFFSET(KVM_SECURE_GUEST, kvm, arch.secure_guest); + OFFSET(VCPU_DSISR, kvm_vcpu, arch.shregs.dsisr); + OFFSET(VCPU_DAR, kvm_vcpu, arch.shregs.dar); + OFFSET(VCPU_VPA, kvm_vcpu, arch.vpa.pinned_addr); + OFFSET(VCPU_VPA_DIRTY, kvm_vcpu, arch.vpa.dirty); + OFFSET(VCPU_HEIR, kvm_vcpu, arch.emul_inst); + OFFSET(VCPU_NESTED, kvm_vcpu, arch.nested); + OFFSET(VCPU_CPU, kvm_vcpu, cpu); + OFFSET(VCPU_THREAD_CPU, kvm_vcpu, arch.thread_cpu); +#endif +#ifdef CONFIG_PPC_BOOK3S + OFFSET(VCPU_PURR, kvm_vcpu, arch.purr); + OFFSET(VCPU_SPURR, kvm_vcpu, arch.spurr); + OFFSET(VCPU_IC, kvm_vcpu, arch.ic); + OFFSET(VCPU_DSCR, kvm_vcpu, arch.dscr); + OFFSET(VCPU_AMR, kvm_vcpu, arch.amr); + OFFSET(VCPU_UAMOR, kvm_vcpu, arch.uamor); + OFFSET(VCPU_IAMR, kvm_vcpu, arch.iamr); + OFFSET(VCPU_CTRL, kvm_vcpu, arch.ctrl); + OFFSET(VCPU_DABR, kvm_vcpu, arch.dabr); + OFFSET(VCPU_DABRX, kvm_vcpu, arch.dabrx); + OFFSET(VCPU_DAWR0, kvm_vcpu, arch.dawr0); + OFFSET(VCPU_DAWRX0, kvm_vcpu, arch.dawrx0); + OFFSET(VCPU_DAWR1, kvm_vcpu, arch.dawr1); + OFFSET(VCPU_DAWRX1, kvm_vcpu, arch.dawrx1); + OFFSET(VCPU_CIABR, kvm_vcpu, arch.ciabr); + OFFSET(VCPU_HFLAGS, kvm_vcpu, arch.hflags); + OFFSET(VCPU_DEC_EXPIRES, kvm_vcpu, arch.dec_expires); + OFFSET(VCPU_PENDING_EXC, kvm_vcpu, arch.pending_exceptions); + OFFSET(VCPU_CEDED, kvm_vcpu, arch.ceded); + OFFSET(VCPU_PRODDED, kvm_vcpu, arch.prodded); + OFFSET(VCPU_IRQ_PENDING, kvm_vcpu, arch.irq_pending); + OFFSET(VCPU_DBELL_REQ, kvm_vcpu, arch.doorbell_request); + OFFSET(VCPU_MMCR, kvm_vcpu, arch.mmcr); + OFFSET(VCPU_MMCRA, kvm_vcpu, arch.mmcra); + OFFSET(VCPU_MMCRS, kvm_vcpu, arch.mmcrs); + OFFSET(VCPU_PMC, kvm_vcpu, arch.pmc); + OFFSET(VCPU_SIAR, kvm_vcpu, arch.siar); + OFFSET(VCPU_SDAR, kvm_vcpu, arch.sdar); + OFFSET(VCPU_SIER, kvm_vcpu, arch.sier); + OFFSET(VCPU_SLB, kvm_vcpu, arch.slb); + OFFSET(VCPU_SLB_MAX, kvm_vcpu, arch.slb_max); + OFFSET(VCPU_SLB_NR, kvm_vcpu, arch.slb_nr); + OFFSET(VCPU_FAULT_DSISR, kvm_vcpu, arch.fault_dsisr); + OFFSET(VCPU_FAULT_DAR, kvm_vcpu, arch.fault_dar); + OFFSET(VCPU_INTR_MSR, kvm_vcpu, arch.intr_msr); + OFFSET(VCPU_LAST_INST, kvm_vcpu, arch.last_inst); + OFFSET(VCPU_TRAP, kvm_vcpu, arch.trap); + OFFSET(VCPU_CFAR, kvm_vcpu, arch.cfar); + OFFSET(VCPU_PPR, kvm_vcpu, arch.ppr); + OFFSET(VCPU_FSCR, kvm_vcpu, arch.fscr); + OFFSET(VCPU_PSPB, kvm_vcpu, arch.pspb); + OFFSET(VCPU_EBBHR, kvm_vcpu, arch.ebbhr); + OFFSET(VCPU_EBBRR, kvm_vcpu, arch.ebbrr); + OFFSET(VCPU_BESCR, kvm_vcpu, arch.bescr); + OFFSET(VCPU_CSIGR, kvm_vcpu, arch.csigr); + OFFSET(VCPU_TACR, kvm_vcpu, arch.tacr); + OFFSET(VCPU_TCSCR, kvm_vcpu, arch.tcscr); + OFFSET(VCPU_ACOP, kvm_vcpu, arch.acop); + OFFSET(VCPU_WORT, kvm_vcpu, arch.wort); + OFFSET(VCPU_TID, kvm_vcpu, arch.tid); + OFFSET(VCPU_PSSCR, kvm_vcpu, arch.psscr); + OFFSET(VCPU_HFSCR, kvm_vcpu, arch.hfscr); + OFFSET(VCORE_ENTRY_EXIT, kvmppc_vcore, entry_exit_map); + OFFSET(VCORE_IN_GUEST, kvmppc_vcore, in_guest); + OFFSET(VCORE_NAPPING_THREADS, kvmppc_vcore, napping_threads); + OFFSET(VCORE_KVM, kvmppc_vcore, kvm); + OFFSET(VCORE_TB_OFFSET, kvmppc_vcore, tb_offset); + OFFSET(VCORE_TB_OFFSET_APPL, kvmppc_vcore, tb_offset_applied); + OFFSET(VCORE_LPCR, kvmppc_vcore, lpcr); + OFFSET(VCORE_PCR, kvmppc_vcore, pcr); + OFFSET(VCORE_DPDES, kvmppc_vcore, dpdes); + OFFSET(VCORE_VTB, kvmppc_vcore, vtb); + OFFSET(VCPU_SLB_E, kvmppc_slb, orige); + OFFSET(VCPU_SLB_V, kvmppc_slb, origv); + DEFINE(VCPU_SLB_SIZE, sizeof(struct kvmppc_slb)); +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + OFFSET(VCPU_TFHAR, kvm_vcpu, arch.tfhar); + OFFSET(VCPU_TFIAR, kvm_vcpu, arch.tfiar); + OFFSET(VCPU_TEXASR, kvm_vcpu, arch.texasr); + OFFSET(VCPU_ORIG_TEXASR, kvm_vcpu, arch.orig_texasr); + OFFSET(VCPU_GPR_TM, kvm_vcpu, arch.gpr_tm); + OFFSET(VCPU_FPRS_TM, kvm_vcpu, arch.fp_tm.fpr); + OFFSET(VCPU_VRS_TM, kvm_vcpu, arch.vr_tm.vr); + OFFSET(VCPU_VRSAVE_TM, kvm_vcpu, arch.vrsave_tm); + OFFSET(VCPU_CR_TM, kvm_vcpu, arch.cr_tm); + OFFSET(VCPU_XER_TM, kvm_vcpu, arch.xer_tm); + OFFSET(VCPU_LR_TM, kvm_vcpu, arch.lr_tm); + OFFSET(VCPU_CTR_TM, kvm_vcpu, arch.ctr_tm); + OFFSET(VCPU_AMR_TM, kvm_vcpu, arch.amr_tm); + OFFSET(VCPU_PPR_TM, kvm_vcpu, arch.ppr_tm); + OFFSET(VCPU_DSCR_TM, kvm_vcpu, arch.dscr_tm); + OFFSET(VCPU_TAR_TM, kvm_vcpu, arch.tar_tm); +#endif + +#ifdef CONFIG_PPC_BOOK3S_64 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + OFFSET(PACA_SVCPU, paca_struct, shadow_vcpu); +# define SVCPU_FIELD(x, f) DEFINE(x, offsetof(struct paca_struct, shadow_vcpu.f)) +#else +# define SVCPU_FIELD(x, f) +#endif +# define HSTATE_FIELD(x, f) DEFINE(x, offsetof(struct paca_struct, kvm_hstate.f)) +#else /* 32-bit */ +# define SVCPU_FIELD(x, f) DEFINE(x, offsetof(struct kvmppc_book3s_shadow_vcpu, f)) +# define HSTATE_FIELD(x, f) DEFINE(x, offsetof(struct kvmppc_book3s_shadow_vcpu, hstate.f)) +#endif + + SVCPU_FIELD(SVCPU_CR, cr); + SVCPU_FIELD(SVCPU_XER, xer); + SVCPU_FIELD(SVCPU_CTR, ctr); + SVCPU_FIELD(SVCPU_LR, lr); + SVCPU_FIELD(SVCPU_PC, pc); + SVCPU_FIELD(SVCPU_R0, gpr[0]); + SVCPU_FIELD(SVCPU_R1, gpr[1]); + SVCPU_FIELD(SVCPU_R2, gpr[2]); + SVCPU_FIELD(SVCPU_R3, gpr[3]); + SVCPU_FIELD(SVCPU_R4, gpr[4]); + SVCPU_FIELD(SVCPU_R5, gpr[5]); + SVCPU_FIELD(SVCPU_R6, gpr[6]); + SVCPU_FIELD(SVCPU_R7, gpr[7]); + SVCPU_FIELD(SVCPU_R8, gpr[8]); + SVCPU_FIELD(SVCPU_R9, gpr[9]); + SVCPU_FIELD(SVCPU_R10, gpr[10]); + SVCPU_FIELD(SVCPU_R11, gpr[11]); + SVCPU_FIELD(SVCPU_R12, gpr[12]); + SVCPU_FIELD(SVCPU_R13, gpr[13]); + SVCPU_FIELD(SVCPU_FAULT_DSISR, fault_dsisr); + SVCPU_FIELD(SVCPU_FAULT_DAR, fault_dar); + SVCPU_FIELD(SVCPU_LAST_INST, last_inst); + SVCPU_FIELD(SVCPU_SHADOW_SRR1, shadow_srr1); +#ifdef CONFIG_PPC_BOOK3S_32 + SVCPU_FIELD(SVCPU_SR, sr); +#endif +#ifdef CONFIG_PPC64 + SVCPU_FIELD(SVCPU_SLB, slb); + SVCPU_FIELD(SVCPU_SLB_MAX, slb_max); + SVCPU_FIELD(SVCPU_SHADOW_FSCR, shadow_fscr); +#endif + + HSTATE_FIELD(HSTATE_HOST_R1, host_r1); + HSTATE_FIELD(HSTATE_HOST_R2, host_r2); + HSTATE_FIELD(HSTATE_HOST_MSR, host_msr); + HSTATE_FIELD(HSTATE_VMHANDLER, vmhandler); + HSTATE_FIELD(HSTATE_SCRATCH0, scratch0); + HSTATE_FIELD(HSTATE_SCRATCH1, scratch1); + HSTATE_FIELD(HSTATE_SCRATCH2, scratch2); + HSTATE_FIELD(HSTATE_IN_GUEST, in_guest); + HSTATE_FIELD(HSTATE_RESTORE_HID5, restore_hid5); + HSTATE_FIELD(HSTATE_NAPPING, napping); + +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE + HSTATE_FIELD(HSTATE_HWTHREAD_REQ, hwthread_req); + HSTATE_FIELD(HSTATE_HWTHREAD_STATE, hwthread_state); + HSTATE_FIELD(HSTATE_KVM_VCPU, kvm_vcpu); + HSTATE_FIELD(HSTATE_KVM_VCORE, kvm_vcore); + HSTATE_FIELD(HSTATE_XIVE_TIMA_PHYS, xive_tima_phys); + HSTATE_FIELD(HSTATE_XIVE_TIMA_VIRT, xive_tima_virt); + HSTATE_FIELD(HSTATE_HOST_IPI, host_ipi); + HSTATE_FIELD(HSTATE_PTID, ptid); + HSTATE_FIELD(HSTATE_FAKE_SUSPEND, fake_suspend); + HSTATE_FIELD(HSTATE_MMCR0, host_mmcr[0]); + HSTATE_FIELD(HSTATE_MMCR1, host_mmcr[1]); + HSTATE_FIELD(HSTATE_MMCRA, host_mmcr[2]); + HSTATE_FIELD(HSTATE_SIAR, host_mmcr[3]); + HSTATE_FIELD(HSTATE_SDAR, host_mmcr[4]); + HSTATE_FIELD(HSTATE_MMCR2, host_mmcr[5]); + HSTATE_FIELD(HSTATE_SIER, host_mmcr[6]); + HSTATE_FIELD(HSTATE_MMCR3, host_mmcr[7]); + HSTATE_FIELD(HSTATE_SIER2, host_mmcr[8]); + HSTATE_FIELD(HSTATE_SIER3, host_mmcr[9]); + HSTATE_FIELD(HSTATE_PMC1, host_pmc[0]); + HSTATE_FIELD(HSTATE_PMC2, host_pmc[1]); + HSTATE_FIELD(HSTATE_PMC3, host_pmc[2]); + HSTATE_FIELD(HSTATE_PMC4, host_pmc[3]); + HSTATE_FIELD(HSTATE_PMC5, host_pmc[4]); + HSTATE_FIELD(HSTATE_PMC6, host_pmc[5]); + HSTATE_FIELD(HSTATE_PURR, host_purr); + HSTATE_FIELD(HSTATE_SPURR, host_spurr); + HSTATE_FIELD(HSTATE_DSCR, host_dscr); + HSTATE_FIELD(HSTATE_DABR, dabr); + HSTATE_FIELD(HSTATE_DECEXP, dec_expires); + HSTATE_FIELD(HSTATE_SPLIT_MODE, kvm_split_mode); + DEFINE(IPI_PRIORITY, IPI_PRIORITY); + OFFSET(KVM_SPLIT_RPR, kvm_split_mode, rpr); + OFFSET(KVM_SPLIT_PMMAR, kvm_split_mode, pmmar); + OFFSET(KVM_SPLIT_LDBAR, kvm_split_mode, ldbar); + OFFSET(KVM_SPLIT_DO_NAP, kvm_split_mode, do_nap); + OFFSET(KVM_SPLIT_NAPPED, kvm_split_mode, napped); +#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */ + +#ifdef CONFIG_PPC_BOOK3S_64 + HSTATE_FIELD(HSTATE_CFAR, cfar); + HSTATE_FIELD(HSTATE_PPR, ppr); + HSTATE_FIELD(HSTATE_HOST_FSCR, host_fscr); +#endif /* CONFIG_PPC_BOOK3S_64 */ + +#else /* CONFIG_PPC_BOOK3S */ + OFFSET(VCPU_CR, kvm_vcpu, arch.regs.ccr); + OFFSET(VCPU_XER, kvm_vcpu, arch.regs.xer); + OFFSET(VCPU_LR, kvm_vcpu, arch.regs.link); + OFFSET(VCPU_CTR, kvm_vcpu, arch.regs.ctr); + OFFSET(VCPU_PC, kvm_vcpu, arch.regs.nip); + OFFSET(VCPU_SPRG9, kvm_vcpu, arch.sprg9); + OFFSET(VCPU_LAST_INST, kvm_vcpu, arch.last_inst); + OFFSET(VCPU_FAULT_DEAR, kvm_vcpu, arch.fault_dear); + OFFSET(VCPU_FAULT_ESR, kvm_vcpu, arch.fault_esr); + OFFSET(VCPU_CRIT_SAVE, kvm_vcpu, arch.crit_save); +#endif /* CONFIG_PPC_BOOK3S */ +#endif /* CONFIG_KVM */ + +#ifdef CONFIG_KVM_GUEST + OFFSET(KVM_MAGIC_SCRATCH1, kvm_vcpu_arch_shared, scratch1); + OFFSET(KVM_MAGIC_SCRATCH2, kvm_vcpu_arch_shared, scratch2); + OFFSET(KVM_MAGIC_SCRATCH3, kvm_vcpu_arch_shared, scratch3); + OFFSET(KVM_MAGIC_INT, kvm_vcpu_arch_shared, int_pending); + OFFSET(KVM_MAGIC_MSR, kvm_vcpu_arch_shared, msr); + OFFSET(KVM_MAGIC_CRITICAL, kvm_vcpu_arch_shared, critical); + OFFSET(KVM_MAGIC_SR, kvm_vcpu_arch_shared, sr); +#endif + +#ifdef CONFIG_44x + DEFINE(PGD_T_LOG2, PGD_T_LOG2); + DEFINE(PTE_T_LOG2, PTE_T_LOG2); +#endif +#ifdef CONFIG_PPC_E500 + DEFINE(TLBCAM_SIZE, sizeof(struct tlbcam)); + OFFSET(TLBCAM_MAS0, tlbcam, MAS0); + OFFSET(TLBCAM_MAS1, tlbcam, MAS1); + OFFSET(TLBCAM_MAS2, tlbcam, MAS2); + OFFSET(TLBCAM_MAS3, tlbcam, MAS3); + OFFSET(TLBCAM_MAS7, tlbcam, MAS7); +#endif + +#if defined(CONFIG_KVM) && defined(CONFIG_SPE) + OFFSET(VCPU_EVR, kvm_vcpu, arch.evr[0]); + OFFSET(VCPU_ACC, kvm_vcpu, arch.acc); + OFFSET(VCPU_SPEFSCR, kvm_vcpu, arch.spefscr); + OFFSET(VCPU_HOST_SPEFSCR, kvm_vcpu, arch.host_spefscr); +#endif + +#ifdef CONFIG_KVM_BOOKE_HV + OFFSET(VCPU_HOST_MAS4, kvm_vcpu, arch.host_mas4); + OFFSET(VCPU_HOST_MAS6, kvm_vcpu, arch.host_mas6); +#endif + +#ifdef CONFIG_KVM_XICS + DEFINE(VCPU_XIVE_SAVED_STATE, offsetof(struct kvm_vcpu, + arch.xive_saved_state)); + DEFINE(VCPU_XIVE_CAM_WORD, offsetof(struct kvm_vcpu, + arch.xive_cam_word)); + DEFINE(VCPU_XIVE_PUSHED, offsetof(struct kvm_vcpu, arch.xive_pushed)); + DEFINE(VCPU_XIVE_ESC_ON, offsetof(struct kvm_vcpu, arch.xive_esc_on)); + DEFINE(VCPU_XIVE_ESC_RADDR, offsetof(struct kvm_vcpu, arch.xive_esc_raddr)); + DEFINE(VCPU_XIVE_ESC_VADDR, offsetof(struct kvm_vcpu, arch.xive_esc_vaddr)); +#endif + +#ifdef CONFIG_KVM_EXIT_TIMING + OFFSET(VCPU_TIMING_EXIT_TBU, kvm_vcpu, arch.timing_exit.tv32.tbu); + OFFSET(VCPU_TIMING_EXIT_TBL, kvm_vcpu, arch.timing_exit.tv32.tbl); + OFFSET(VCPU_TIMING_LAST_ENTER_TBU, kvm_vcpu, arch.timing_last_enter.tv32.tbu); + OFFSET(VCPU_TIMING_LAST_ENTER_TBL, kvm_vcpu, arch.timing_last_enter.tv32.tbl); +#endif + + DEFINE(PPC_DBELL_SERVER, PPC_DBELL_SERVER); + +#ifdef CONFIG_PPC_8xx + DEFINE(VIRT_IMMR_BASE, (u64)__fix_to_virt(FIX_IMMR_BASE)); +#endif + +#ifdef CONFIG_XMON + DEFINE(BPT_SIZE, BPT_SIZE); +#endif + + return 0; +} diff --git a/arch/powerpc/kernel/audit.c b/arch/powerpc/kernel/audit.c new file mode 100644 index 000000000..1bcfca5fd --- /dev/null +++ b/arch/powerpc/kernel/audit.c @@ -0,0 +1,86 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/init.h> +#include <linux/types.h> +#include <linux/audit.h> +#include <asm/unistd.h> + +static unsigned dir_class[] = { +#include <asm-generic/audit_dir_write.h> +~0U +}; + +static unsigned read_class[] = { +#include <asm-generic/audit_read.h> +~0U +}; + +static unsigned write_class[] = { +#include <asm-generic/audit_write.h> +~0U +}; + +static unsigned chattr_class[] = { +#include <asm-generic/audit_change_attr.h> +~0U +}; + +static unsigned signal_class[] = { +#include <asm-generic/audit_signal.h> +~0U +}; + +int audit_classify_arch(int arch) +{ +#ifdef CONFIG_PPC64 + if (arch == AUDIT_ARCH_PPC) + return 1; +#endif + return 0; +} + +int audit_classify_syscall(int abi, unsigned syscall) +{ +#ifdef CONFIG_PPC64 + extern int ppc32_classify_syscall(unsigned); + if (abi == AUDIT_ARCH_PPC) + return ppc32_classify_syscall(syscall); +#endif + switch(syscall) { + case __NR_open: + return AUDITSC_OPEN; + case __NR_openat: + return AUDITSC_OPENAT; + case __NR_socketcall: + return AUDITSC_SOCKETCALL; + case __NR_execve: + return AUDITSC_EXECVE; + case __NR_openat2: + return AUDITSC_OPENAT2; + default: + return AUDITSC_NATIVE; + } +} + +static int __init audit_classes_init(void) +{ +#ifdef CONFIG_PPC64 + extern __u32 ppc32_dir_class[]; + extern __u32 ppc32_write_class[]; + extern __u32 ppc32_read_class[]; + extern __u32 ppc32_chattr_class[]; + extern __u32 ppc32_signal_class[]; + audit_register_class(AUDIT_CLASS_WRITE_32, ppc32_write_class); + audit_register_class(AUDIT_CLASS_READ_32, ppc32_read_class); + audit_register_class(AUDIT_CLASS_DIR_WRITE_32, ppc32_dir_class); + audit_register_class(AUDIT_CLASS_CHATTR_32, ppc32_chattr_class); + audit_register_class(AUDIT_CLASS_SIGNAL_32, ppc32_signal_class); +#endif + audit_register_class(AUDIT_CLASS_WRITE, write_class); + audit_register_class(AUDIT_CLASS_READ, read_class); + audit_register_class(AUDIT_CLASS_DIR_WRITE, dir_class); + audit_register_class(AUDIT_CLASS_CHATTR, chattr_class); + audit_register_class(AUDIT_CLASS_SIGNAL, signal_class); + return 0; +} + +__initcall(audit_classes_init); diff --git a/arch/powerpc/kernel/btext.c b/arch/powerpc/kernel/btext.c new file mode 100644 index 000000000..276988921 --- /dev/null +++ b/arch/powerpc/kernel/btext.c @@ -0,0 +1,931 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Procedures for drawing on the screen early on in the boot process. + * + * Benjamin Herrenschmidt <benh@kernel.crashing.org> + */ +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/export.h> +#include <linux/memblock.h> +#include <linux/pgtable.h> +#include <linux/of.h> + +#include <asm/sections.h> +#include <asm/btext.h> +#include <asm/page.h> +#include <asm/mmu.h> +#include <asm/io.h> +#include <asm/processor.h> +#include <asm/udbg.h> + +#define NO_SCROLL + +#ifndef NO_SCROLL +static void scrollscreen(void); +#endif + +#define __force_data __section(".data") + +static int g_loc_X __force_data; +static int g_loc_Y __force_data; +static int g_max_loc_X __force_data; +static int g_max_loc_Y __force_data; + +static int dispDeviceRowBytes __force_data; +static int dispDeviceDepth __force_data; +static int dispDeviceRect[4] __force_data; +static unsigned char *dispDeviceBase __force_data; +static unsigned char *logicalDisplayBase __force_data; + +unsigned long disp_BAT[2] __initdata = {0, 0}; + +#define cmapsz (16*256) + +static unsigned char vga_font[cmapsz]; + +static int boot_text_mapped __force_data; + +extern void rmci_on(void); +extern void rmci_off(void); + +static inline void rmci_maybe_on(void) +{ +#if defined(CONFIG_PPC_EARLY_DEBUG_BOOTX) && defined(CONFIG_PPC64) + if (!(mfmsr() & MSR_DR)) + rmci_on(); +#endif +} + +static inline void rmci_maybe_off(void) +{ +#if defined(CONFIG_PPC_EARLY_DEBUG_BOOTX) && defined(CONFIG_PPC64) + if (!(mfmsr() & MSR_DR)) + rmci_off(); +#endif +} + + +#ifdef CONFIG_PPC32 +/* Calc BAT values for mapping the display and store them + * in disp_BAT. Those values are then used from head.S to map + * the display during identify_machine() and MMU_Init() + * + * The display is mapped to virtual address 0xD0000000, rather + * than 1:1, because some CHRP machines put the frame buffer + * in the region starting at 0xC0000000 (PAGE_OFFSET). + * This mapping is temporary and will disappear as soon as the + * setup done by MMU_Init() is applied. + * + * For now, we align the BAT and then map 8Mb on 601 and 16Mb + * on other PPCs. This may cause trouble if the framebuffer + * is really badly aligned, but I didn't encounter this case + * yet. + */ +void __init btext_prepare_BAT(void) +{ + unsigned long vaddr = PAGE_OFFSET + 0x10000000; + unsigned long addr; + unsigned long lowbits; + + addr = (unsigned long)dispDeviceBase; + if (!addr) { + boot_text_mapped = 0; + return; + } + lowbits = addr & ~0xFF000000UL; + addr &= 0xFF000000UL; + disp_BAT[0] = vaddr | (BL_16M<<2) | 2; + disp_BAT[1] = addr | (_PAGE_NO_CACHE | _PAGE_GUARDED | BPP_RW); + logicalDisplayBase = (void *) (vaddr + lowbits); +} +#endif + + +/* This function can be used to enable the early boot text when doing + * OF booting or within bootx init. It must be followed by a btext_unmap() + * call before the logical address becomes unusable + */ +void __init btext_setup_display(int width, int height, int depth, int pitch, + unsigned long address) +{ + g_loc_X = 0; + g_loc_Y = 0; + g_max_loc_X = width / 8; + g_max_loc_Y = height / 16; + logicalDisplayBase = (unsigned char *)address; + dispDeviceBase = (unsigned char *)address; + dispDeviceRowBytes = pitch; + dispDeviceDepth = depth == 15 ? 16 : depth; + dispDeviceRect[0] = dispDeviceRect[1] = 0; + dispDeviceRect[2] = width; + dispDeviceRect[3] = height; + boot_text_mapped = 1; +} + +void __init btext_unmap(void) +{ + boot_text_mapped = 0; +} + +/* Here's a small text engine to use during early boot + * or for debugging purposes + * + * todo: + * + * - build some kind of vgacon with it to enable early printk + * - move to a separate file + * - add a few video driver hooks to keep in sync with display + * changes. + */ + +void btext_map(void) +{ + unsigned long base, offset, size; + unsigned char *vbase; + + /* By default, we are no longer mapped */ + boot_text_mapped = 0; + if (!dispDeviceBase) + return; + base = ((unsigned long) dispDeviceBase) & 0xFFFFF000UL; + offset = ((unsigned long) dispDeviceBase) - base; + size = dispDeviceRowBytes * dispDeviceRect[3] + offset + + dispDeviceRect[0]; + vbase = ioremap_wc(base, size); + if (!vbase) + return; + logicalDisplayBase = vbase + offset; + boot_text_mapped = 1; +} + +static int __init btext_initialize(struct device_node *np) +{ + unsigned int width, height, depth, pitch; + unsigned long address = 0; + const u32 *prop; + + prop = of_get_property(np, "linux,bootx-width", NULL); + if (prop == NULL) + prop = of_get_property(np, "width", NULL); + if (prop == NULL) + return -EINVAL; + width = *prop; + prop = of_get_property(np, "linux,bootx-height", NULL); + if (prop == NULL) + prop = of_get_property(np, "height", NULL); + if (prop == NULL) + return -EINVAL; + height = *prop; + prop = of_get_property(np, "linux,bootx-depth", NULL); + if (prop == NULL) + prop = of_get_property(np, "depth", NULL); + if (prop == NULL) + return -EINVAL; + depth = *prop; + pitch = width * ((depth + 7) / 8); + prop = of_get_property(np, "linux,bootx-linebytes", NULL); + if (prop == NULL) + prop = of_get_property(np, "linebytes", NULL); + if (prop && *prop != 0xffffffffu) + pitch = *prop; + if (pitch == 1) + pitch = 0x1000; + prop = of_get_property(np, "linux,bootx-addr", NULL); + if (prop == NULL) + prop = of_get_property(np, "address", NULL); + if (prop) + address = *prop; + + /* FIXME: Add support for PCI reg properties. Right now, only + * reliable on macs + */ + if (address == 0) + return -EINVAL; + + g_loc_X = 0; + g_loc_Y = 0; + g_max_loc_X = width / 8; + g_max_loc_Y = height / 16; + dispDeviceBase = (unsigned char *)address; + dispDeviceRowBytes = pitch; + dispDeviceDepth = depth == 15 ? 16 : depth; + dispDeviceRect[0] = dispDeviceRect[1] = 0; + dispDeviceRect[2] = width; + dispDeviceRect[3] = height; + + btext_map(); + + return 0; +} + +int __init btext_find_display(int allow_nonstdout) +{ + struct device_node *np = of_stdout; + int rc = -ENODEV; + + if (!of_node_is_type(np, "display")) { + printk("boot stdout isn't a display !\n"); + np = NULL; + } + if (np) + rc = btext_initialize(np); + if (rc == 0 || !allow_nonstdout) + return rc; + + for_each_node_by_type(np, "display") { + if (of_get_property(np, "linux,opened", NULL)) { + printk("trying %pOF ...\n", np); + rc = btext_initialize(np); + printk("result: %d\n", rc); + } + if (rc == 0) { + of_node_put(np); + break; + } + } + return rc; +} + +/* Calc the base address of a given point (x,y) */ +static unsigned char * calc_base(int x, int y) +{ + unsigned char *base; + + base = logicalDisplayBase; + if (!base) + base = dispDeviceBase; + base += (x + dispDeviceRect[0]) * (dispDeviceDepth >> 3); + base += (y + dispDeviceRect[1]) * dispDeviceRowBytes; + return base; +} + +/* Adjust the display to a new resolution */ +void btext_update_display(unsigned long phys, int width, int height, + int depth, int pitch) +{ + if (!dispDeviceBase) + return; + + /* check it's the same frame buffer (within 256MB) */ + if ((phys ^ (unsigned long)dispDeviceBase) & 0xf0000000) + return; + + dispDeviceBase = (__u8 *) phys; + dispDeviceRect[0] = 0; + dispDeviceRect[1] = 0; + dispDeviceRect[2] = width; + dispDeviceRect[3] = height; + dispDeviceDepth = depth; + dispDeviceRowBytes = pitch; + if (boot_text_mapped) { + iounmap(logicalDisplayBase); + boot_text_mapped = 0; + } + btext_map(); + g_loc_X = 0; + g_loc_Y = 0; + g_max_loc_X = width / 8; + g_max_loc_Y = height / 16; +} +EXPORT_SYMBOL(btext_update_display); + +void __init btext_clearscreen(void) +{ + unsigned int *base = (unsigned int *)calc_base(0, 0); + unsigned long width = ((dispDeviceRect[2] - dispDeviceRect[0]) * + (dispDeviceDepth >> 3)) >> 2; + int i,j; + + rmci_maybe_on(); + for (i=0; i<(dispDeviceRect[3] - dispDeviceRect[1]); i++) + { + unsigned int *ptr = base; + for(j=width; j; --j) + *(ptr++) = 0; + base += (dispDeviceRowBytes >> 2); + } + rmci_maybe_off(); +} + +void __init btext_flushscreen(void) +{ + unsigned int *base = (unsigned int *)calc_base(0, 0); + unsigned long width = ((dispDeviceRect[2] - dispDeviceRect[0]) * + (dispDeviceDepth >> 3)) >> 2; + int i,j; + + for (i=0; i < (dispDeviceRect[3] - dispDeviceRect[1]); i++) + { + unsigned int *ptr = base; + for(j = width; j > 0; j -= 8) { + __asm__ __volatile__ ("dcbst 0,%0" :: "r" (ptr)); + ptr += 8; + } + base += (dispDeviceRowBytes >> 2); + } + __asm__ __volatile__ ("sync" ::: "memory"); +} + +void __init btext_flushline(void) +{ + unsigned int *base = (unsigned int *)calc_base(0, g_loc_Y << 4); + unsigned long width = ((dispDeviceRect[2] - dispDeviceRect[0]) * + (dispDeviceDepth >> 3)) >> 2; + int i,j; + + for (i=0; i < 16; i++) + { + unsigned int *ptr = base; + for(j = width; j > 0; j -= 8) { + __asm__ __volatile__ ("dcbst 0,%0" :: "r" (ptr)); + ptr += 8; + } + base += (dispDeviceRowBytes >> 2); + } + __asm__ __volatile__ ("sync" ::: "memory"); +} + + +#ifndef NO_SCROLL +static void scrollscreen(void) +{ + unsigned int *src = (unsigned int *)calc_base(0,16); + unsigned int *dst = (unsigned int *)calc_base(0,0); + unsigned long width = ((dispDeviceRect[2] - dispDeviceRect[0]) * + (dispDeviceDepth >> 3)) >> 2; + int i,j; + + rmci_maybe_on(); + + for (i=0; i<(dispDeviceRect[3] - dispDeviceRect[1] - 16); i++) + { + unsigned int *src_ptr = src; + unsigned int *dst_ptr = dst; + for(j=width; j; --j) + *(dst_ptr++) = *(src_ptr++); + src += (dispDeviceRowBytes >> 2); + dst += (dispDeviceRowBytes >> 2); + } + for (i=0; i<16; i++) + { + unsigned int *dst_ptr = dst; + for(j=width; j; --j) + *(dst_ptr++) = 0; + dst += (dispDeviceRowBytes >> 2); + } + + rmci_maybe_off(); +} +#endif /* ndef NO_SCROLL */ + +static unsigned int expand_bits_8[16] = { + 0x00000000, + 0x000000ff, + 0x0000ff00, + 0x0000ffff, + 0x00ff0000, + 0x00ff00ff, + 0x00ffff00, + 0x00ffffff, + 0xff000000, + 0xff0000ff, + 0xff00ff00, + 0xff00ffff, + 0xffff0000, + 0xffff00ff, + 0xffffff00, + 0xffffffff +}; + +static unsigned int expand_bits_16[4] = { + 0x00000000, + 0x0000ffff, + 0xffff0000, + 0xffffffff +}; + + +static void draw_byte_32(unsigned char *font, unsigned int *base, int rb) +{ + int l, bits; + int fg = 0xFFFFFFFFUL; + int bg = 0x00000000UL; + + for (l = 0; l < 16; ++l) + { + bits = *font++; + base[0] = (-(bits >> 7) & fg) ^ bg; + base[1] = (-((bits >> 6) & 1) & fg) ^ bg; + base[2] = (-((bits >> 5) & 1) & fg) ^ bg; + base[3] = (-((bits >> 4) & 1) & fg) ^ bg; + base[4] = (-((bits >> 3) & 1) & fg) ^ bg; + base[5] = (-((bits >> 2) & 1) & fg) ^ bg; + base[6] = (-((bits >> 1) & 1) & fg) ^ bg; + base[7] = (-(bits & 1) & fg) ^ bg; + base = (unsigned int *) ((char *)base + rb); + } +} + +static inline void draw_byte_16(unsigned char *font, unsigned int *base, int rb) +{ + int l, bits; + int fg = 0xFFFFFFFFUL; + int bg = 0x00000000UL; + unsigned int *eb = (int *)expand_bits_16; + + for (l = 0; l < 16; ++l) + { + bits = *font++; + base[0] = (eb[bits >> 6] & fg) ^ bg; + base[1] = (eb[(bits >> 4) & 3] & fg) ^ bg; + base[2] = (eb[(bits >> 2) & 3] & fg) ^ bg; + base[3] = (eb[bits & 3] & fg) ^ bg; + base = (unsigned int *) ((char *)base + rb); + } +} + +static inline void draw_byte_8(unsigned char *font, unsigned int *base, int rb) +{ + int l, bits; + int fg = 0x0F0F0F0FUL; + int bg = 0x00000000UL; + unsigned int *eb = (int *)expand_bits_8; + + for (l = 0; l < 16; ++l) + { + bits = *font++; + base[0] = (eb[bits >> 4] & fg) ^ bg; + base[1] = (eb[bits & 0xf] & fg) ^ bg; + base = (unsigned int *) ((char *)base + rb); + } +} + +static noinline void draw_byte(unsigned char c, long locX, long locY) +{ + unsigned char *base = calc_base(locX << 3, locY << 4); + unsigned char *font = &vga_font[((unsigned int)c) * 16]; + int rb = dispDeviceRowBytes; + + rmci_maybe_on(); + switch(dispDeviceDepth) { + case 24: + case 32: + draw_byte_32(font, (unsigned int *)base, rb); + break; + case 15: + case 16: + draw_byte_16(font, (unsigned int *)base, rb); + break; + case 8: + draw_byte_8(font, (unsigned int *)base, rb); + break; + } + rmci_maybe_off(); +} + +void btext_drawchar(char c) +{ + int cline = 0; +#ifdef NO_SCROLL + int x; +#endif + if (!boot_text_mapped) + return; + + switch (c) { + case '\b': + if (g_loc_X > 0) + --g_loc_X; + break; + case '\t': + g_loc_X = (g_loc_X & -8) + 8; + break; + case '\r': + g_loc_X = 0; + break; + case '\n': + g_loc_X = 0; + g_loc_Y++; + cline = 1; + break; + default: + draw_byte(c, g_loc_X++, g_loc_Y); + } + if (g_loc_X >= g_max_loc_X) { + g_loc_X = 0; + g_loc_Y++; + cline = 1; + } +#ifndef NO_SCROLL + while (g_loc_Y >= g_max_loc_Y) { + scrollscreen(); + g_loc_Y--; + } +#else + /* wrap around from bottom to top of screen so we don't + waste time scrolling each line. -- paulus. */ + if (g_loc_Y >= g_max_loc_Y) + g_loc_Y = 0; + if (cline) { + for (x = 0; x < g_max_loc_X; ++x) + draw_byte(' ', x, g_loc_Y); + } +#endif +} + +void btext_drawstring(const char *c) +{ + if (!boot_text_mapped) + return; + while (*c) + btext_drawchar(*c++); +} + +void __init btext_drawtext(const char *c, unsigned int len) +{ + if (!boot_text_mapped) + return; + while (len--) + btext_drawchar(*c++); +} + +void __init btext_drawhex(unsigned long v) +{ + if (!boot_text_mapped) + return; +#ifdef CONFIG_PPC64 + btext_drawchar(hex_asc_hi(v >> 56)); + btext_drawchar(hex_asc_lo(v >> 56)); + btext_drawchar(hex_asc_hi(v >> 48)); + btext_drawchar(hex_asc_lo(v >> 48)); + btext_drawchar(hex_asc_hi(v >> 40)); + btext_drawchar(hex_asc_lo(v >> 40)); + btext_drawchar(hex_asc_hi(v >> 32)); + btext_drawchar(hex_asc_lo(v >> 32)); +#endif + btext_drawchar(hex_asc_hi(v >> 24)); + btext_drawchar(hex_asc_lo(v >> 24)); + btext_drawchar(hex_asc_hi(v >> 16)); + btext_drawchar(hex_asc_lo(v >> 16)); + btext_drawchar(hex_asc_hi(v >> 8)); + btext_drawchar(hex_asc_lo(v >> 8)); + btext_drawchar(hex_asc_hi(v)); + btext_drawchar(hex_asc_lo(v)); + btext_drawchar(' '); +} + +void __init udbg_init_btext(void) +{ + /* If btext is enabled, we might have a BAT setup for early display, + * thus we do enable some very basic udbg output + */ + udbg_putc = btext_drawchar; +} + +static unsigned char vga_font[cmapsz] = { +0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, +0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0x81, 0xa5, 0x81, 0x81, 0xbd, +0x99, 0x81, 0x81, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0xff, +0xdb, 0xff, 0xff, 0xc3, 0xe7, 0xff, 0xff, 0x7e, 0x00, 0x00, 0x00, 0x00, +0x00, 0x00, 0x00, 0x00, 0x6c, 0xfe, 0xfe, 0xfe, 0xfe, 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intel_cacheinfo implementation. + * + * Copyright 2008 IBM Corporation + * Author: Nathan Lynch + */ + +#define pr_fmt(fmt) "cacheinfo: " fmt + +#include <linux/cpu.h> +#include <linux/cpumask.h> +#include <linux/kernel.h> +#include <linux/kobject.h> +#include <linux/list.h> +#include <linux/notifier.h> +#include <linux/of.h> +#include <linux/percpu.h> +#include <linux/slab.h> +#include <asm/cputhreads.h> +#include <asm/smp.h> + +#include "cacheinfo.h" + +/* per-cpu object for tracking: + * - a "cache" kobject for the top-level directory + * - a list of "index" objects representing the cpu's local cache hierarchy + */ +struct cache_dir { + struct kobject *kobj; /* bare (not embedded) kobject for cache + * directory */ + struct cache_index_dir *index; /* list of index objects */ +}; + +/* "index" object: each cpu's cache directory has an index + * subdirectory corresponding to a cache object associated with the + * cpu. This object's lifetime is managed via the embedded kobject. + */ +struct cache_index_dir { + struct kobject kobj; + struct cache_index_dir *next; /* next index in parent directory */ + struct cache *cache; +}; + +/* Template for determining which OF properties to query for a given + * cache type */ +struct cache_type_info { + const char *name; + const char *size_prop; + + /* Allow for both [di]-cache-line-size and + * [di]-cache-block-size properties. According to the PowerPC + * Processor binding, -line-size should be provided if it + * differs from the cache block size (that which is operated + * on by cache instructions), so we look for -line-size first. + * See cache_get_line_size(). */ + + const char *line_size_props[2]; + const char *nr_sets_prop; +}; + +/* These are used to index the cache_type_info array. */ +#define CACHE_TYPE_UNIFIED 0 /* cache-size, cache-block-size, etc. */ +#define CACHE_TYPE_UNIFIED_D 1 /* d-cache-size, d-cache-block-size, etc */ +#define CACHE_TYPE_INSTRUCTION 2 +#define CACHE_TYPE_DATA 3 + +static const struct cache_type_info cache_type_info[] = { + { + /* Embedded systems that use cache-size, cache-block-size, + * etc. for the Unified (typically L2) cache. */ + .name = "Unified", + .size_prop = "cache-size", + .line_size_props = { "cache-line-size", + "cache-block-size", }, + .nr_sets_prop = "cache-sets", + }, + { + /* PowerPC Processor binding says the [di]-cache-* + * must be equal on unified caches, so just use + * d-cache properties. */ + .name = "Unified", + .size_prop = "d-cache-size", + .line_size_props = { "d-cache-line-size", + "d-cache-block-size", }, + .nr_sets_prop = "d-cache-sets", + }, + { + .name = "Instruction", + .size_prop = "i-cache-size", + .line_size_props = { "i-cache-line-size", + "i-cache-block-size", }, + .nr_sets_prop = "i-cache-sets", + }, + { + .name = "Data", + .size_prop = "d-cache-size", + .line_size_props = { "d-cache-line-size", + "d-cache-block-size", }, + .nr_sets_prop = "d-cache-sets", + }, +}; + +/* Cache object: each instance of this corresponds to a distinct cache + * in the system. There are separate objects for Harvard caches: one + * each for instruction and data, and each refers to the same OF node. + * The refcount of the OF node is elevated for the lifetime of the + * cache object. A cache object is released when its shared_cpu_map + * is cleared (see cache_cpu_clear). + * + * A cache object is on two lists: an unsorted global list + * (cache_list) of cache objects; and a singly-linked list + * representing the local cache hierarchy, which is ordered by level + * (e.g. L1d -> L1i -> L2 -> L3). + */ +struct cache { + struct device_node *ofnode; /* OF node for this cache, may be cpu */ + struct cpumask shared_cpu_map; /* online CPUs using this cache */ + int type; /* split cache disambiguation */ + int level; /* level not explicit in device tree */ + int group_id; /* id of the group of threads that share this cache */ + struct list_head list; /* global list of cache objects */ + struct cache *next_local; /* next cache of >= level */ +}; + +static DEFINE_PER_CPU(struct cache_dir *, cache_dir_pcpu); + +/* traversal/modification of this list occurs only at cpu hotplug time; + * access is serialized by cpu hotplug locking + */ +static LIST_HEAD(cache_list); + +static struct cache_index_dir *kobj_to_cache_index_dir(struct kobject *k) +{ + return container_of(k, struct cache_index_dir, kobj); +} + +static const char *cache_type_string(const struct cache *cache) +{ + return cache_type_info[cache->type].name; +} + +static void cache_init(struct cache *cache, int type, int level, + struct device_node *ofnode, int group_id) +{ + cache->type = type; + cache->level = level; + cache->ofnode = of_node_get(ofnode); + cache->group_id = group_id; + INIT_LIST_HEAD(&cache->list); + list_add(&cache->list, &cache_list); +} + +static struct cache *new_cache(int type, int level, + struct device_node *ofnode, int group_id) +{ + struct cache *cache; + + cache = kzalloc(sizeof(*cache), GFP_KERNEL); + if (cache) + cache_init(cache, type, level, ofnode, group_id); + + return cache; +} + +static void release_cache_debugcheck(struct cache *cache) +{ + struct cache *iter; + + list_for_each_entry(iter, &cache_list, list) + WARN_ONCE(iter->next_local == cache, + "cache for %pOFP(%s) refers to cache for %pOFP(%s)\n", + iter->ofnode, + cache_type_string(iter), + cache->ofnode, + cache_type_string(cache)); +} + +static void release_cache(struct cache *cache) +{ + if (!cache) + return; + + pr_debug("freeing L%d %s cache for %pOFP\n", cache->level, + cache_type_string(cache), cache->ofnode); + + release_cache_debugcheck(cache); + list_del(&cache->list); + of_node_put(cache->ofnode); + kfree(cache); +} + +static void cache_cpu_set(struct cache *cache, int cpu) +{ + struct cache *next = cache; + + while (next) { + WARN_ONCE(cpumask_test_cpu(cpu, &next->shared_cpu_map), + "CPU %i already accounted in %pOFP(%s)\n", + cpu, next->ofnode, + cache_type_string(next)); + cpumask_set_cpu(cpu, &next->shared_cpu_map); + next = next->next_local; + } +} + +static int cache_size(const struct cache *cache, unsigned int *ret) +{ + const char *propname; + const __be32 *cache_size; + + propname = cache_type_info[cache->type].size_prop; + + cache_size = of_get_property(cache->ofnode, propname, NULL); + if (!cache_size) + return -ENODEV; + + *ret = of_read_number(cache_size, 1); + return 0; +} + +static int cache_size_kb(const struct cache *cache, unsigned int *ret) +{ + unsigned int size; + + if (cache_size(cache, &size)) + return -ENODEV; + + *ret = size / 1024; + return 0; +} + +/* not cache_line_size() because that's a macro in include/linux/cache.h */ +static int cache_get_line_size(const struct cache *cache, unsigned int *ret) +{ + const __be32 *line_size; + int i, lim; + + lim = ARRAY_SIZE(cache_type_info[cache->type].line_size_props); + + for (i = 0; i < lim; i++) { + const char *propname; + + propname = cache_type_info[cache->type].line_size_props[i]; + line_size = of_get_property(cache->ofnode, propname, NULL); + if (line_size) + break; + } + + if (!line_size) + return -ENODEV; + + *ret = of_read_number(line_size, 1); + return 0; +} + +static int cache_nr_sets(const struct cache *cache, unsigned int *ret) +{ + const char *propname; + const __be32 *nr_sets; + + propname = cache_type_info[cache->type].nr_sets_prop; + + nr_sets = of_get_property(cache->ofnode, propname, NULL); + if (!nr_sets) + return -ENODEV; + + *ret = of_read_number(nr_sets, 1); + return 0; +} + +static int cache_associativity(const struct cache *cache, unsigned int *ret) +{ + unsigned int line_size; + unsigned int nr_sets; + unsigned int size; + + if (cache_nr_sets(cache, &nr_sets)) + goto err; + + /* If the cache is fully associative, there is no need to + * check the other properties. + */ + if (nr_sets == 1) { + *ret = 0; + return 0; + } + + if (cache_get_line_size(cache, &line_size)) + goto err; + if (cache_size(cache, &size)) + goto err; + + if (!(nr_sets > 0 && size > 0 && line_size > 0)) + goto err; + + *ret = (size / nr_sets) / line_size; + return 0; +err: + return -ENODEV; +} + +/* helper for dealing with split caches */ +static struct cache *cache_find_first_sibling(struct cache *cache) +{ + struct cache *iter; + + if (cache->type == CACHE_TYPE_UNIFIED || + cache->type == CACHE_TYPE_UNIFIED_D) + return cache; + + list_for_each_entry(iter, &cache_list, list) + if (iter->ofnode == cache->ofnode && + iter->group_id == cache->group_id && + iter->next_local == cache) + return iter; + + return cache; +} + +/* return the first cache on a local list matching node and thread-group id */ +static struct cache *cache_lookup_by_node_group(const struct device_node *node, + int group_id) +{ + struct cache *cache = NULL; + struct cache *iter; + + list_for_each_entry(iter, &cache_list, list) { + if (iter->ofnode != node || + iter->group_id != group_id) + continue; + cache = cache_find_first_sibling(iter); + break; + } + + return cache; +} + +static bool cache_node_is_unified(const struct device_node *np) +{ + return of_get_property(np, "cache-unified", NULL); +} + +/* + * Unified caches can have two different sets of tags. Most embedded + * use cache-size, etc. for the unified cache size, but open firmware systems + * use d-cache-size, etc. Check on initialization for which type we have, and + * return the appropriate structure type. Assume it's embedded if it isn't + * open firmware. If it's yet a 3rd type, then there will be missing entries + * in /sys/devices/system/cpu/cpu0/cache/index2/, and this code will need + * to be extended further. + */ +static int cache_is_unified_d(const struct device_node *np) +{ + return of_get_property(np, + cache_type_info[CACHE_TYPE_UNIFIED_D].size_prop, NULL) ? + CACHE_TYPE_UNIFIED_D : CACHE_TYPE_UNIFIED; +} + +static struct cache *cache_do_one_devnode_unified(struct device_node *node, int group_id, + int level) +{ + pr_debug("creating L%d ucache for %pOFP\n", level, node); + + return new_cache(cache_is_unified_d(node), level, node, group_id); +} + +static struct cache *cache_do_one_devnode_split(struct device_node *node, int group_id, + int level) +{ + struct cache *dcache, *icache; + + pr_debug("creating L%d dcache and icache for %pOFP\n", level, + node); + + dcache = new_cache(CACHE_TYPE_DATA, level, node, group_id); + icache = new_cache(CACHE_TYPE_INSTRUCTION, level, node, group_id); + + if (!dcache || !icache) + goto err; + + dcache->next_local = icache; + + return dcache; +err: + release_cache(dcache); + release_cache(icache); + return NULL; +} + +static struct cache *cache_do_one_devnode(struct device_node *node, int group_id, int level) +{ + struct cache *cache; + + if (cache_node_is_unified(node)) + cache = cache_do_one_devnode_unified(node, group_id, level); + else + cache = cache_do_one_devnode_split(node, group_id, level); + + return cache; +} + +static struct cache *cache_lookup_or_instantiate(struct device_node *node, + int group_id, + int level) +{ + struct cache *cache; + + cache = cache_lookup_by_node_group(node, group_id); + + WARN_ONCE(cache && cache->level != level, + "cache level mismatch on lookup (got %d, expected %d)\n", + cache->level, level); + + if (!cache) + cache = cache_do_one_devnode(node, group_id, level); + + return cache; +} + +static void link_cache_lists(struct cache *smaller, struct cache *bigger) +{ + while (smaller->next_local) { + if (smaller->next_local == bigger) + return; /* already linked */ + smaller = smaller->next_local; + } + + smaller->next_local = bigger; + + /* + * The cache->next_local list sorts by level ascending: + * L1d -> L1i -> L2 -> L3 ... + */ + WARN_ONCE((smaller->level == 1 && bigger->level > 2) || + (smaller->level > 1 && bigger->level != smaller->level + 1), + "linking L%i cache %pOFP to L%i cache %pOFP; skipped a level?\n", + smaller->level, smaller->ofnode, bigger->level, bigger->ofnode); +} + +static void do_subsidiary_caches_debugcheck(struct cache *cache) +{ + WARN_ONCE(cache->level != 1, + "instantiating cache chain from L%d %s cache for " + "%pOFP instead of an L1\n", cache->level, + cache_type_string(cache), cache->ofnode); + WARN_ONCE(!of_node_is_type(cache->ofnode, "cpu"), + "instantiating cache chain from node %pOFP of type '%s' " + "instead of a cpu node\n", cache->ofnode, + of_node_get_device_type(cache->ofnode)); +} + +/* + * If sub-groups of threads in a core containing @cpu_id share the + * L@level-cache (information obtained via "ibm,thread-groups" + * device-tree property), then we identify the group by the first + * thread-sibling in the group. We define this to be the group-id. + * + * In the absence of any thread-group information for L@level-cache, + * this function returns -1. + */ +static int get_group_id(unsigned int cpu_id, int level) +{ + if (has_big_cores && level == 1) + return cpumask_first(per_cpu(thread_group_l1_cache_map, + cpu_id)); + else if (thread_group_shares_l2 && level == 2) + return cpumask_first(per_cpu(thread_group_l2_cache_map, + cpu_id)); + else if (thread_group_shares_l3 && level == 3) + return cpumask_first(per_cpu(thread_group_l3_cache_map, + cpu_id)); + return -1; +} + +static void do_subsidiary_caches(struct cache *cache, unsigned int cpu_id) +{ + struct device_node *subcache_node; + int level = cache->level; + + do_subsidiary_caches_debugcheck(cache); + + while ((subcache_node = of_find_next_cache_node(cache->ofnode))) { + struct cache *subcache; + int group_id; + + level++; + group_id = get_group_id(cpu_id, level); + subcache = cache_lookup_or_instantiate(subcache_node, group_id, level); + of_node_put(subcache_node); + if (!subcache) + break; + + link_cache_lists(cache, subcache); + cache = subcache; + } +} + +static struct cache *cache_chain_instantiate(unsigned int cpu_id) +{ + struct device_node *cpu_node; + struct cache *cpu_cache = NULL; + int group_id; + + pr_debug("creating cache object(s) for CPU %i\n", cpu_id); + + cpu_node = of_get_cpu_node(cpu_id, NULL); + WARN_ONCE(!cpu_node, "no OF node found for CPU %i\n", cpu_id); + if (!cpu_node) + goto out; + + group_id = get_group_id(cpu_id, 1); + + cpu_cache = cache_lookup_or_instantiate(cpu_node, group_id, 1); + if (!cpu_cache) + goto out; + + do_subsidiary_caches(cpu_cache, cpu_id); + + cache_cpu_set(cpu_cache, cpu_id); +out: + of_node_put(cpu_node); + + return cpu_cache; +} + +static struct cache_dir *cacheinfo_create_cache_dir(unsigned int cpu_id) +{ + struct cache_dir *cache_dir; + struct device *dev; + struct kobject *kobj = NULL; + + dev = get_cpu_device(cpu_id); + WARN_ONCE(!dev, "no dev for CPU %i\n", cpu_id); + if (!dev) + goto err; + + kobj = kobject_create_and_add("cache", &dev->kobj); + if (!kobj) + goto err; + + cache_dir = kzalloc(sizeof(*cache_dir), GFP_KERNEL); + if (!cache_dir) + goto err; + + cache_dir->kobj = kobj; + + WARN_ON_ONCE(per_cpu(cache_dir_pcpu, cpu_id) != NULL); + + per_cpu(cache_dir_pcpu, cpu_id) = cache_dir; + + return cache_dir; +err: + kobject_put(kobj); + return NULL; +} + +static void cache_index_release(struct kobject *kobj) +{ + struct cache_index_dir *index; + + index = kobj_to_cache_index_dir(kobj); + + pr_debug("freeing index directory for L%d %s cache\n", + index->cache->level, cache_type_string(index->cache)); + + kfree(index); +} + +static ssize_t cache_index_show(struct kobject *k, struct attribute *attr, char *buf) +{ + struct kobj_attribute *kobj_attr; + + kobj_attr = container_of(attr, struct kobj_attribute, attr); + + return kobj_attr->show(k, kobj_attr, buf); +} + +static struct cache *index_kobj_to_cache(struct kobject *k) +{ + struct cache_index_dir *index; + + index = kobj_to_cache_index_dir(k); + + return index->cache; +} + +static ssize_t size_show(struct kobject *k, struct kobj_attribute *attr, char *buf) +{ + unsigned int size_kb; + struct cache *cache; + + cache = index_kobj_to_cache(k); + + if (cache_size_kb(cache, &size_kb)) + return -ENODEV; + + return sprintf(buf, "%uK\n", size_kb); +} + +static struct kobj_attribute cache_size_attr = + __ATTR(size, 0444, size_show, NULL); + + +static ssize_t line_size_show(struct kobject *k, struct kobj_attribute *attr, char *buf) +{ + unsigned int line_size; + struct cache *cache; + + cache = index_kobj_to_cache(k); + + if (cache_get_line_size(cache, &line_size)) + return -ENODEV; + + return sprintf(buf, "%u\n", line_size); +} + +static struct kobj_attribute cache_line_size_attr = + __ATTR(coherency_line_size, 0444, line_size_show, NULL); + +static ssize_t nr_sets_show(struct kobject *k, struct kobj_attribute *attr, char *buf) +{ + unsigned int nr_sets; + struct cache *cache; + + cache = index_kobj_to_cache(k); + + if (cache_nr_sets(cache, &nr_sets)) + return -ENODEV; + + return sprintf(buf, "%u\n", nr_sets); +} + +static struct kobj_attribute cache_nr_sets_attr = + __ATTR(number_of_sets, 0444, nr_sets_show, NULL); + +static ssize_t associativity_show(struct kobject *k, struct kobj_attribute *attr, char *buf) +{ + unsigned int associativity; + struct cache *cache; + + cache = index_kobj_to_cache(k); + + if (cache_associativity(cache, &associativity)) + return -ENODEV; + + return sprintf(buf, "%u\n", associativity); +} + +static struct kobj_attribute cache_assoc_attr = + __ATTR(ways_of_associativity, 0444, associativity_show, NULL); + +static ssize_t type_show(struct kobject *k, struct kobj_attribute *attr, char *buf) +{ + struct cache *cache; + + cache = index_kobj_to_cache(k); + + return sprintf(buf, "%s\n", cache_type_string(cache)); +} + +static struct kobj_attribute cache_type_attr = + __ATTR(type, 0444, type_show, NULL); + +static ssize_t level_show(struct kobject *k, struct kobj_attribute *attr, char *buf) +{ + struct cache_index_dir *index; + struct cache *cache; + + index = kobj_to_cache_index_dir(k); + cache = index->cache; + + return sprintf(buf, "%d\n", cache->level); +} + +static struct kobj_attribute cache_level_attr = + __ATTR(level, 0444, level_show, NULL); + +static ssize_t +show_shared_cpumap(struct kobject *k, struct kobj_attribute *attr, char *buf, bool list) +{ + struct cache_index_dir *index; + struct cache *cache; + const struct cpumask *mask; + + index = kobj_to_cache_index_dir(k); + cache = index->cache; + + mask = &cache->shared_cpu_map; + + return cpumap_print_to_pagebuf(list, buf, mask); +} + +static ssize_t shared_cpu_map_show(struct kobject *k, struct kobj_attribute *attr, char *buf) +{ + return show_shared_cpumap(k, attr, buf, false); +} + +static ssize_t shared_cpu_list_show(struct kobject *k, struct kobj_attribute *attr, char *buf) +{ + return show_shared_cpumap(k, attr, buf, true); +} + +static struct kobj_attribute cache_shared_cpu_map_attr = + __ATTR(shared_cpu_map, 0444, shared_cpu_map_show, NULL); + +static struct kobj_attribute cache_shared_cpu_list_attr = + __ATTR(shared_cpu_list, 0444, shared_cpu_list_show, NULL); + +/* Attributes which should always be created -- the kobject/sysfs core + * does this automatically via kobj_type->default_groups. This is the + * minimum data required to uniquely identify a cache. + */ +static struct attribute *cache_index_default_attrs[] = { + &cache_type_attr.attr, + &cache_level_attr.attr, + &cache_shared_cpu_map_attr.attr, + &cache_shared_cpu_list_attr.attr, + NULL, +}; +ATTRIBUTE_GROUPS(cache_index_default); + +/* Attributes which should be created if the cache device node has the + * right properties -- see cacheinfo_create_index_opt_attrs + */ +static struct kobj_attribute *cache_index_opt_attrs[] = { + &cache_size_attr, + &cache_line_size_attr, + &cache_nr_sets_attr, + &cache_assoc_attr, +}; + +static const struct sysfs_ops cache_index_ops = { + .show = cache_index_show, +}; + +static struct kobj_type cache_index_type = { + .release = cache_index_release, + .sysfs_ops = &cache_index_ops, + .default_groups = cache_index_default_groups, +}; + +static void cacheinfo_create_index_opt_attrs(struct cache_index_dir *dir) +{ + const char *cache_type; + struct cache *cache; + char *buf; + int i; + + buf = kmalloc(PAGE_SIZE, GFP_KERNEL); + if (!buf) + return; + + cache = dir->cache; + cache_type = cache_type_string(cache); + + /* We don't want to create an attribute that can't provide a + * meaningful value. Check the return value of each optional + * attribute's ->show method before registering the + * attribute. + */ + for (i = 0; i < ARRAY_SIZE(cache_index_opt_attrs); i++) { + struct kobj_attribute *attr; + ssize_t rc; + + attr = cache_index_opt_attrs[i]; + + rc = attr->show(&dir->kobj, attr, buf); + if (rc <= 0) { + pr_debug("not creating %s attribute for " + "%pOFP(%s) (rc = %zd)\n", + attr->attr.name, cache->ofnode, + cache_type, rc); + continue; + } + if (sysfs_create_file(&dir->kobj, &attr->attr)) + pr_debug("could not create %s attribute for %pOFP(%s)\n", + attr->attr.name, cache->ofnode, cache_type); + } + + kfree(buf); +} + +static void cacheinfo_create_index_dir(struct cache *cache, int index, + struct cache_dir *cache_dir) +{ + struct cache_index_dir *index_dir; + int rc; + + index_dir = kzalloc(sizeof(*index_dir), GFP_KERNEL); + if (!index_dir) + return; + + index_dir->cache = cache; + + rc = kobject_init_and_add(&index_dir->kobj, &cache_index_type, + cache_dir->kobj, "index%d", index); + if (rc) { + kobject_put(&index_dir->kobj); + return; + } + + index_dir->next = cache_dir->index; + cache_dir->index = index_dir; + + cacheinfo_create_index_opt_attrs(index_dir); +} + +static void cacheinfo_sysfs_populate(unsigned int cpu_id, + struct cache *cache_list) +{ + struct cache_dir *cache_dir; + struct cache *cache; + int index = 0; + + cache_dir = cacheinfo_create_cache_dir(cpu_id); + if (!cache_dir) + return; + + cache = cache_list; + while (cache) { + cacheinfo_create_index_dir(cache, index, cache_dir); + index++; + cache = cache->next_local; + } +} + +void cacheinfo_cpu_online(unsigned int cpu_id) +{ + struct cache *cache; + + cache = cache_chain_instantiate(cpu_id); + if (!cache) + return; + + cacheinfo_sysfs_populate(cpu_id, cache); +} + +/* functions needed to remove cache entry for cpu offline or suspend/resume */ + +#if (defined(CONFIG_PPC_PSERIES) && defined(CONFIG_SUSPEND)) || \ + defined(CONFIG_HOTPLUG_CPU) + +static struct cache *cache_lookup_by_cpu(unsigned int cpu_id) +{ + struct device_node *cpu_node; + struct cache *cache; + int group_id; + + cpu_node = of_get_cpu_node(cpu_id, NULL); + WARN_ONCE(!cpu_node, "no OF node found for CPU %i\n", cpu_id); + if (!cpu_node) + return NULL; + + group_id = get_group_id(cpu_id, 1); + cache = cache_lookup_by_node_group(cpu_node, group_id); + of_node_put(cpu_node); + + return cache; +} + +static void remove_index_dirs(struct cache_dir *cache_dir) +{ + struct cache_index_dir *index; + + index = cache_dir->index; + + while (index) { + struct cache_index_dir *next; + + next = index->next; + kobject_put(&index->kobj); + index = next; + } +} + +static void remove_cache_dir(struct cache_dir *cache_dir) +{ + remove_index_dirs(cache_dir); + + /* Remove cache dir from sysfs */ + kobject_del(cache_dir->kobj); + + kobject_put(cache_dir->kobj); + + kfree(cache_dir); +} + +static void cache_cpu_clear(struct cache *cache, int cpu) +{ + while (cache) { + struct cache *next = cache->next_local; + + WARN_ONCE(!cpumask_test_cpu(cpu, &cache->shared_cpu_map), + "CPU %i not accounted in %pOFP(%s)\n", + cpu, cache->ofnode, + cache_type_string(cache)); + + cpumask_clear_cpu(cpu, &cache->shared_cpu_map); + + /* Release the cache object if all the cpus using it + * are offline */ + if (cpumask_empty(&cache->shared_cpu_map)) + release_cache(cache); + + cache = next; + } +} + +void cacheinfo_cpu_offline(unsigned int cpu_id) +{ + struct cache_dir *cache_dir; + struct cache *cache; + + /* Prevent userspace from seeing inconsistent state - remove + * the sysfs hierarchy first */ + cache_dir = per_cpu(cache_dir_pcpu, cpu_id); + + /* careful, sysfs population may have failed */ + if (cache_dir) + remove_cache_dir(cache_dir); + + per_cpu(cache_dir_pcpu, cpu_id) = NULL; + + /* clear the CPU's bit in its cache chain, possibly freeing + * cache objects */ + cache = cache_lookup_by_cpu(cpu_id); + if (cache) + cache_cpu_clear(cache, cpu_id); +} + +void cacheinfo_teardown(void) +{ + unsigned int cpu; + + lockdep_assert_cpus_held(); + + for_each_online_cpu(cpu) + cacheinfo_cpu_offline(cpu); +} + +void cacheinfo_rebuild(void) +{ + unsigned int cpu; + + lockdep_assert_cpus_held(); + + for_each_online_cpu(cpu) + cacheinfo_cpu_online(cpu); +} + +#endif /* (CONFIG_PPC_PSERIES && CONFIG_SUSPEND) || CONFIG_HOTPLUG_CPU */ diff --git a/arch/powerpc/kernel/cacheinfo.h b/arch/powerpc/kernel/cacheinfo.h new file mode 100644 index 000000000..52bd3fc66 --- /dev/null +++ b/arch/powerpc/kernel/cacheinfo.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _PPC_CACHEINFO_H +#define _PPC_CACHEINFO_H + +/* These are just hooks for sysfs.c to use. */ +extern void cacheinfo_cpu_online(unsigned int cpu_id); +extern void cacheinfo_cpu_offline(unsigned int cpu_id); + +/* Allow migration/suspend to tear down and rebuild the hierarchy. */ +extern void cacheinfo_teardown(void); +extern void cacheinfo_rebuild(void); + +#endif /* _PPC_CACHEINFO_H */ diff --git a/arch/powerpc/kernel/compat_audit.c b/arch/powerpc/kernel/compat_audit.c new file mode 100644 index 000000000..d92ffe4e5 --- /dev/null +++ b/arch/powerpc/kernel/compat_audit.c @@ -0,0 +1,47 @@ +// SPDX-License-Identifier: GPL-2.0 +#undef __powerpc64__ +#include <linux/audit_arch.h> +#include <asm/unistd.h> + +unsigned ppc32_dir_class[] = { +#include <asm-generic/audit_dir_write.h> +~0U +}; + +unsigned ppc32_chattr_class[] = { +#include <asm-generic/audit_change_attr.h> +~0U +}; + +unsigned ppc32_write_class[] = { +#include <asm-generic/audit_write.h> +~0U +}; + +unsigned ppc32_read_class[] = { +#include <asm-generic/audit_read.h> +~0U +}; + +unsigned ppc32_signal_class[] = { +#include <asm-generic/audit_signal.h> +~0U +}; + +int ppc32_classify_syscall(unsigned syscall) +{ + switch(syscall) { + case __NR_open: + return AUDITSC_OPEN; + case __NR_openat: + return AUDITSC_OPENAT; + case __NR_socketcall: + return AUDITSC_SOCKETCALL; + case __NR_execve: + return AUDITSC_EXECVE; + case __NR_openat2: + return AUDITSC_OPENAT2; + default: + return AUDITSC_COMPAT; + } +} diff --git a/arch/powerpc/kernel/cpu_setup_44x.S b/arch/powerpc/kernel/cpu_setup_44x.S new file mode 100644 index 000000000..e1d705ea2 --- /dev/null +++ b/arch/powerpc/kernel/cpu_setup_44x.S @@ -0,0 +1,69 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * This file contains low level CPU setup functions. + * Valentine Barshak <vbarshak@ru.mvista.com> + * MontaVista Software, Inc (c) 2007 + * + * Based on cpu_setup_6xx code by + * Benjamin Herrenschmidt <benh@kernel.crashing.org> + */ + +#include <asm/processor.h> +#include <asm/cputable.h> +#include <asm/ppc_asm.h> + +_GLOBAL(__setup_cpu_440ep) + b __init_fpu_44x +_GLOBAL(__setup_cpu_440epx) + mflr r4 + bl __init_fpu_44x + bl __plb_disable_wrp + bl __fixup_440A_mcheck + mtlr r4 + blr +_GLOBAL(__setup_cpu_440grx) + mflr r4 + bl __plb_disable_wrp + bl __fixup_440A_mcheck + mtlr r4 + blr +_GLOBAL(__setup_cpu_460ex) +_GLOBAL(__setup_cpu_460gt) +_GLOBAL(__setup_cpu_460sx) +_GLOBAL(__setup_cpu_apm821xx) + mflr r4 + bl __init_fpu_44x + bl __fixup_440A_mcheck + mtlr r4 + blr + +_GLOBAL(__setup_cpu_440x5) +_GLOBAL(__setup_cpu_440gx) +_GLOBAL(__setup_cpu_440spe) + b __fixup_440A_mcheck + +/* enable APU between CPU and FPU */ +_GLOBAL(__init_fpu_44x) + mfspr r3,SPRN_CCR0 + /* Clear DAPUIB flag in CCR0 */ + rlwinm r3,r3,0,12,10 + mtspr SPRN_CCR0,r3 + isync + blr + +/* + * Workaround for the incorrect write to DDR SDRAM errata. + * The write address can be corrupted during writes to + * DDR SDRAM when write pipelining is enabled on PLB0. + * Disable write pipelining here. + */ +#define DCRN_PLB4A0_ACR 0x81 + +_GLOBAL(__plb_disable_wrp) + mfdcr r3,DCRN_PLB4A0_ACR + /* clear WRP bit in PLB4A0_ACR */ + rlwinm r3,r3,0,8,6 + mtdcr DCRN_PLB4A0_ACR,r3 + isync + blr + diff --git a/arch/powerpc/kernel/cpu_setup_6xx.S b/arch/powerpc/kernel/cpu_setup_6xx.S new file mode 100644 index 000000000..f8b5ff64b --- /dev/null +++ b/arch/powerpc/kernel/cpu_setup_6xx.S @@ -0,0 +1,488 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * This file contains low level CPU setup functions. + * Copyright (C) 2003 Benjamin Herrenschmidt (benh@kernel.crashing.org) + */ + +#include <asm/processor.h> +#include <asm/page.h> +#include <asm/cputable.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/cache.h> +#include <asm/mmu.h> +#include <asm/feature-fixups.h> + +_GLOBAL(__setup_cpu_603) + mflr r5 +BEGIN_MMU_FTR_SECTION + li r10,0 + mtspr SPRN_SPRG_603_LRU,r10 /* init SW LRU tracking */ +END_MMU_FTR_SECTION_IFSET(MMU_FTR_NEED_DTLB_SW_LRU) + +BEGIN_FTR_SECTION + bl __init_fpu_registers +END_FTR_SECTION_IFCLR(CPU_FTR_FPU_UNAVAILABLE) + bl setup_common_caches + mtlr r5 + blr +_GLOBAL(__setup_cpu_604) + mflr r5 + bl setup_common_caches + bl setup_604_hid0 + mtlr r5 + blr +_GLOBAL(__setup_cpu_750) + mflr r5 + bl __init_fpu_registers + bl setup_common_caches + bl setup_750_7400_hid0 + mtlr r5 + blr +_GLOBAL(__setup_cpu_750cx) + mflr r5 + bl __init_fpu_registers + bl setup_common_caches + bl setup_750_7400_hid0 + bl setup_750cx + mtlr r5 + blr +_GLOBAL(__setup_cpu_750fx) + mflr r5 + bl __init_fpu_registers + bl setup_common_caches + bl setup_750_7400_hid0 + bl setup_750fx + mtlr r5 + blr +_GLOBAL(__setup_cpu_7400) + mflr r5 + bl __init_fpu_registers + bl setup_7400_workarounds + bl setup_common_caches + bl setup_750_7400_hid0 + mtlr r5 + blr +_GLOBAL(__setup_cpu_7410) + mflr r5 + bl __init_fpu_registers + bl setup_7410_workarounds + bl setup_common_caches + bl setup_750_7400_hid0 + li r3,0 + mtspr SPRN_L2CR2,r3 + mtlr r5 + blr +_GLOBAL(__setup_cpu_745x) + mflr r5 + bl setup_common_caches + bl setup_745x_specifics + mtlr r5 + blr + +/* Enable caches for 603's, 604, 750 & 7400 */ +setup_common_caches: + mfspr r11,SPRN_HID0 + andi. r0,r11,HID0_DCE + ori r11,r11,HID0_ICE|HID0_DCE + ori r8,r11,HID0_ICFI + bne 1f /* don't invalidate the D-cache */ + ori r8,r8,HID0_DCI /* unless it wasn't enabled */ +1: sync + mtspr SPRN_HID0,r8 /* enable and invalidate caches */ + sync + mtspr SPRN_HID0,r11 /* enable caches */ + sync + isync + blr + +/* 604, 604e, 604ev, ... + * Enable superscalar execution & branch history table + */ +setup_604_hid0: + mfspr r11,SPRN_HID0 + ori r11,r11,HID0_SIED|HID0_BHTE + ori r8,r11,HID0_BTCD + sync + mtspr SPRN_HID0,r8 /* flush branch target address cache */ + sync /* on 604e/604r */ + mtspr SPRN_HID0,r11 + sync + isync + blr + +/* 7400 <= rev 2.7 and 7410 rev = 1.0 suffer from some + * erratas we work around here. + * Moto MPC710CE.pdf describes them, those are errata + * #3, #4 and #5 + * Note that we assume the firmware didn't choose to + * apply other workarounds (there are other ones documented + * in the .pdf). It appear that Apple firmware only works + * around #3 and with the same fix we use. We may want to + * check if the CPU is using 60x bus mode in which case + * the workaround for errata #4 is useless. Also, we may + * want to explicitly clear HID0_NOPDST as this is not + * needed once we have applied workaround #5 (though it's + * not set by Apple's firmware at least). + */ +setup_7400_workarounds: + mfpvr r3 + rlwinm r3,r3,0,20,31 + cmpwi 0,r3,0x0207 + ble 1f + blr +setup_7410_workarounds: + mfpvr r3 + rlwinm r3,r3,0,20,31 + cmpwi 0,r3,0x0100 + bnelr +1: + mfspr r11,SPRN_MSSSR0 + /* Errata #3: Set L1OPQ_SIZE to 0x10 */ + rlwinm r11,r11,0,9,6 + oris r11,r11,0x0100 + /* Errata #4: Set L2MQ_SIZE to 1 (check for MPX mode first ?) */ + oris r11,r11,0x0002 + /* Errata #5: Set DRLT_SIZE to 0x01 */ + rlwinm r11,r11,0,5,2 + oris r11,r11,0x0800 + sync + mtspr SPRN_MSSSR0,r11 + sync + isync + blr + +/* 740/750/7400/7410 + * Enable Store Gathering (SGE), Address Broadcast (ABE), + * Branch History Table (BHTE), Branch Target ICache (BTIC) + * Dynamic Power Management (DPM), Speculative (SPD) + * Clear Instruction cache throttling (ICTC) + */ +setup_750_7400_hid0: + mfspr r11,SPRN_HID0 + ori r11,r11,HID0_SGE | HID0_ABE | HID0_BHTE | HID0_BTIC + oris r11,r11,HID0_DPM@h +BEGIN_FTR_SECTION + xori r11,r11,HID0_BTIC +END_FTR_SECTION_IFSET(CPU_FTR_NO_BTIC) +BEGIN_FTR_SECTION + xoris r11,r11,HID0_DPM@h /* disable dynamic power mgmt */ +END_FTR_SECTION_IFSET(CPU_FTR_NO_DPM) + li r3,HID0_SPD + andc r11,r11,r3 /* clear SPD: enable speculative */ + li r3,0 + mtspr SPRN_ICTC,r3 /* Instruction Cache Throttling off */ + isync + mtspr SPRN_HID0,r11 + sync + isync + blr + +/* 750cx specific + * Looks like we have to disable NAP feature for some PLL settings... + * (waiting for confirmation) + */ +setup_750cx: + mfspr r10, SPRN_HID1 + rlwinm r10,r10,4,28,31 + cmpwi cr0,r10,7 + cmpwi cr1,r10,9 + cmpwi cr2,r10,11 + cror 4*cr0+eq,4*cr0+eq,4*cr1+eq + cror 4*cr0+eq,4*cr0+eq,4*cr2+eq + bnelr + lwz r6,CPU_SPEC_FEATURES(r4) + li r7,CPU_FTR_CAN_NAP + andc r6,r6,r7 + stw r6,CPU_SPEC_FEATURES(r4) + blr + +/* 750fx specific + */ +setup_750fx: + blr + +/* MPC 745x + * Enable Store Gathering (SGE), Branch Folding (FOLD) + * Branch History Table (BHTE), Branch Target ICache (BTIC) + * Dynamic Power Management (DPM), Speculative (SPD) + * Ensure our data cache instructions really operate. + * Timebase has to be running or we wouldn't have made it here, + * just ensure we don't disable it. + * Clear Instruction cache throttling (ICTC) + * Enable L2 HW prefetch + */ +setup_745x_specifics: + /* We check for the presence of an L3 cache setup by + * the firmware. If any, we disable NAP capability as + * it's known to be bogus on rev 2.1 and earlier + */ +BEGIN_FTR_SECTION + mfspr r11,SPRN_L3CR + andis. r11,r11,L3CR_L3E@h + beq 1f +END_FTR_SECTION_IFSET(CPU_FTR_L3CR) + lwz r6,CPU_SPEC_FEATURES(r4) + andis. r0,r6,CPU_FTR_L3_DISABLE_NAP@h + beq 1f + li r7,CPU_FTR_CAN_NAP + andc r6,r6,r7 + stw r6,CPU_SPEC_FEATURES(r4) +1: + mfspr r11,SPRN_HID0 + + /* All of the bits we have to set..... + */ + ori r11,r11,HID0_SGE | HID0_FOLD | HID0_BHTE + ori r11,r11,HID0_LRSTK | HID0_BTIC + oris r11,r11,HID0_DPM@h +BEGIN_MMU_FTR_SECTION + oris r11,r11,HID0_HIGH_BAT@h +END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS) +BEGIN_FTR_SECTION + xori r11,r11,HID0_BTIC +END_FTR_SECTION_IFSET(CPU_FTR_NO_BTIC) +BEGIN_FTR_SECTION + xoris r11,r11,HID0_DPM@h /* disable dynamic power mgmt */ +END_FTR_SECTION_IFSET(CPU_FTR_NO_DPM) + + /* All of the bits we have to clear.... + */ + li r3,HID0_SPD | HID0_NOPDST | HID0_NOPTI + andc r11,r11,r3 /* clear SPD: enable speculative */ + li r3,0 + + mtspr SPRN_ICTC,r3 /* Instruction Cache Throttling off */ + isync + mtspr SPRN_HID0,r11 + sync + isync + + /* Enable L2 HW prefetch, if L2 is enabled + */ + mfspr r3,SPRN_L2CR + andis. r3,r3,L2CR_L2E@h + beqlr + mfspr r3,SPRN_MSSCR0 + ori r3,r3,3 + sync + mtspr SPRN_MSSCR0,r3 + sync + isync + blr + +/* + * Initialize the FPU registers. This is needed to work around an errata + * in some 750 cpus where using a not yet initialized FPU register after + * power on reset may hang the CPU + */ +_GLOBAL(__init_fpu_registers) + mfmsr r10 + ori r11,r10,MSR_FP + mtmsr r11 + isync + addis r9,r3,empty_zero_page@ha + addi r9,r9,empty_zero_page@l + REST_32FPRS(0,r9) + sync + mtmsr r10 + isync + blr +_ASM_NOKPROBE_SYMBOL(__init_fpu_registers) + + +/* Definitions for the table use to save CPU states */ +#define CS_HID0 0 +#define CS_HID1 4 +#define CS_HID2 8 +#define CS_MSSCR0 12 +#define CS_MSSSR0 16 +#define CS_ICTRL 20 +#define CS_LDSTCR 24 +#define CS_LDSTDB 28 +#define CS_SIZE 32 + + .data + .balign L1_CACHE_BYTES +cpu_state_storage: + .space CS_SIZE + .balign L1_CACHE_BYTES,0 + .text + +/* Called in normal context to backup CPU 0 state. This + * does not include cache settings. This function is also + * called for machine sleep. This does not include the MMU + * setup, BATs, etc... but rather the "special" registers + * like HID0, HID1, MSSCR0, etc... + */ +_GLOBAL(__save_cpu_setup) + /* Some CR fields are volatile, we back it up all */ + mfcr r7 + + /* Get storage ptr */ + lis r5,cpu_state_storage@h + ori r5,r5,cpu_state_storage@l + + /* Save HID0 (common to all CONFIG_PPC_BOOK3S_32 cpus) */ + mfspr r3,SPRN_HID0 + stw r3,CS_HID0(r5) + + /* Now deal with CPU type dependent registers */ + mfspr r3,SPRN_PVR + srwi r3,r3,16 + cmplwi cr0,r3,0x8000 /* 7450 */ + cmplwi cr1,r3,0x000c /* 7400 */ + cmplwi cr2,r3,0x800c /* 7410 */ + cmplwi cr3,r3,0x8001 /* 7455 */ + cmplwi cr4,r3,0x8002 /* 7457 */ + cmplwi cr5,r3,0x8003 /* 7447A */ + cmplwi cr6,r3,0x7000 /* 750FX */ + cmplwi cr7,r3,0x8004 /* 7448 */ + /* cr1 is 7400 || 7410 */ + cror 4*cr1+eq,4*cr1+eq,4*cr2+eq + /* cr0 is 74xx */ + cror 4*cr0+eq,4*cr0+eq,4*cr3+eq + cror 4*cr0+eq,4*cr0+eq,4*cr4+eq + cror 4*cr0+eq,4*cr0+eq,4*cr1+eq + cror 4*cr0+eq,4*cr0+eq,4*cr5+eq + cror 4*cr0+eq,4*cr0+eq,4*cr7+eq + bne 1f + /* Backup 74xx specific regs */ + mfspr r4,SPRN_MSSCR0 + stw r4,CS_MSSCR0(r5) + mfspr r4,SPRN_MSSSR0 + stw r4,CS_MSSSR0(r5) + beq cr1,1f + /* Backup 745x specific registers */ + mfspr r4,SPRN_HID1 + stw r4,CS_HID1(r5) + mfspr r4,SPRN_ICTRL + stw r4,CS_ICTRL(r5) + mfspr r4,SPRN_LDSTCR + stw r4,CS_LDSTCR(r5) + mfspr r4,SPRN_LDSTDB + stw r4,CS_LDSTDB(r5) +1: + bne cr6,1f + /* Backup 750FX specific registers */ + mfspr r4,SPRN_HID1 + stw r4,CS_HID1(r5) + /* If rev 2.x, backup HID2 */ + mfspr r3,SPRN_PVR + andi. r3,r3,0xff00 + cmpwi cr0,r3,0x0200 + bne 1f + mfspr r4,SPRN_HID2 + stw r4,CS_HID2(r5) +1: + mtcr r7 + blr + +/* Called with no MMU context (typically MSR:IR/DR off) to + * restore CPU state as backed up by the previous + * function. This does not include cache setting + */ +_GLOBAL(__restore_cpu_setup) + /* Some CR fields are volatile, we back it up all */ + mfcr r7 + + /* Get storage ptr */ + lis r5,(cpu_state_storage-KERNELBASE)@h + ori r5,r5,cpu_state_storage@l + + /* Restore HID0 */ + lwz r3,CS_HID0(r5) + sync + isync + mtspr SPRN_HID0,r3 + sync + isync + + /* Now deal with CPU type dependent registers */ + mfspr r3,SPRN_PVR + srwi r3,r3,16 + cmplwi cr0,r3,0x8000 /* 7450 */ + cmplwi cr1,r3,0x000c /* 7400 */ + cmplwi cr2,r3,0x800c /* 7410 */ + cmplwi cr3,r3,0x8001 /* 7455 */ + cmplwi cr4,r3,0x8002 /* 7457 */ + cmplwi cr5,r3,0x8003 /* 7447A */ + cmplwi cr6,r3,0x7000 /* 750FX */ + cmplwi cr7,r3,0x8004 /* 7448 */ + /* cr1 is 7400 || 7410 */ + cror 4*cr1+eq,4*cr1+eq,4*cr2+eq + /* cr0 is 74xx */ + cror 4*cr0+eq,4*cr0+eq,4*cr3+eq + cror 4*cr0+eq,4*cr0+eq,4*cr4+eq + cror 4*cr0+eq,4*cr0+eq,4*cr1+eq + cror 4*cr0+eq,4*cr0+eq,4*cr5+eq + cror 4*cr0+eq,4*cr0+eq,4*cr7+eq + bne 2f + /* Restore 74xx specific regs */ + lwz r4,CS_MSSCR0(r5) + sync + mtspr SPRN_MSSCR0,r4 + sync + isync + lwz r4,CS_MSSSR0(r5) + sync + mtspr SPRN_MSSSR0,r4 + sync + isync + bne cr2,1f + /* Clear 7410 L2CR2 */ + li r4,0 + mtspr SPRN_L2CR2,r4 +1: beq cr1,2f + /* Restore 745x specific registers */ + lwz r4,CS_HID1(r5) + sync + mtspr SPRN_HID1,r4 + isync + sync + lwz r4,CS_ICTRL(r5) + sync + mtspr SPRN_ICTRL,r4 + isync + sync + lwz r4,CS_LDSTCR(r5) + sync + mtspr SPRN_LDSTCR,r4 + isync + sync + lwz r4,CS_LDSTDB(r5) + sync + mtspr SPRN_LDSTDB,r4 + isync + sync +2: bne cr6,1f + /* Restore 750FX specific registers + * that is restore HID2 on rev 2.x and PLL config & switch + * to PLL 0 on all + */ + /* If rev 2.x, restore HID2 with low voltage bit cleared */ + mfspr r3,SPRN_PVR + andi. r3,r3,0xff00 + cmpwi cr0,r3,0x0200 + bne 4f + lwz r4,CS_HID2(r5) + rlwinm r4,r4,0,19,17 + mtspr SPRN_HID2,r4 + sync +4: + lwz r4,CS_HID1(r5) + rlwinm r5,r4,0,16,14 + mtspr SPRN_HID1,r5 + /* Wait for PLL to stabilize */ + mftbl r5 +3: mftbl r6 + sub r6,r6,r5 + cmplwi cr0,r6,10000 + ble 3b + /* Setup final PLL */ + mtspr SPRN_HID1,r4 +1: + mtcr r7 + blr +_ASM_NOKPROBE_SYMBOL(__restore_cpu_setup) + diff --git a/arch/powerpc/kernel/cpu_setup_e500.S b/arch/powerpc/kernel/cpu_setup_e500.S new file mode 100644 index 000000000..2ab25161b --- /dev/null +++ b/arch/powerpc/kernel/cpu_setup_e500.S @@ -0,0 +1,333 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * This file contains low level CPU setup functions. + * Kumar Gala <galak@kernel.crashing.org> + * Copyright 2009 Freescale Semiconductor, Inc. + * + * Based on cpu_setup_6xx code by + * Benjamin Herrenschmidt <benh@kernel.crashing.org> + */ + +#include <asm/page.h> +#include <asm/processor.h> +#include <asm/cputable.h> +#include <asm/ppc_asm.h> +#include <asm/nohash/mmu-e500.h> +#include <asm/asm-offsets.h> +#include <asm/mpc85xx.h> + +_GLOBAL(__e500_icache_setup) + mfspr r0, SPRN_L1CSR1 + andi. r3, r0, L1CSR1_ICE + bnelr /* Already enabled */ + oris r0, r0, L1CSR1_CPE@h + ori r0, r0, (L1CSR1_ICFI | L1CSR1_ICLFR | L1CSR1_ICE) + mtspr SPRN_L1CSR1, r0 /* Enable I-Cache */ + isync + blr + +_GLOBAL(__e500_dcache_setup) + mfspr r0, SPRN_L1CSR0 + andi. r3, r0, L1CSR0_DCE + bnelr /* Already enabled */ + msync + isync + li r0, 0 + mtspr SPRN_L1CSR0, r0 /* Disable */ + msync + isync + li r0, (L1CSR0_DCFI | L1CSR0_CLFC) + mtspr SPRN_L1CSR0, r0 /* Invalidate */ + isync +1: mfspr r0, SPRN_L1CSR0 + andi. r3, r0, L1CSR0_CLFC + bne+ 1b /* Wait for lock bits reset */ + oris r0, r0, L1CSR0_CPE@h + ori r0, r0, L1CSR0_DCE + msync + isync + mtspr SPRN_L1CSR0, r0 /* Enable */ + isync + blr + +/* + * FIXME - we haven't yet done testing to determine a reasonable default + * value for PW20_WAIT_IDLE_BIT. + */ +#define PW20_WAIT_IDLE_BIT 50 /* 1ms, TB frequency is 41.66MHZ */ +_GLOBAL(setup_pw20_idle) + mfspr r3, SPRN_PWRMGTCR0 + + /* Set PW20_WAIT bit, enable pw20 state*/ + ori r3, r3, PWRMGTCR0_PW20_WAIT + li r11, PW20_WAIT_IDLE_BIT + + /* Set Automatic PW20 Core Idle Count */ + rlwimi r3, r11, PWRMGTCR0_PW20_ENT_SHIFT, PWRMGTCR0_PW20_ENT + + mtspr SPRN_PWRMGTCR0, r3 + + blr + +/* + * FIXME - we haven't yet done testing to determine a reasonable default + * value for AV_WAIT_IDLE_BIT. + */ +#define AV_WAIT_IDLE_BIT 50 /* 1ms, TB frequency is 41.66MHZ */ +_GLOBAL(setup_altivec_idle) + mfspr r3, SPRN_PWRMGTCR0 + + /* Enable Altivec Idle */ + oris r3, r3, PWRMGTCR0_AV_IDLE_PD_EN@h + li r11, AV_WAIT_IDLE_BIT + + /* Set Automatic AltiVec Idle Count */ + rlwimi r3, r11, PWRMGTCR0_AV_IDLE_CNT_SHIFT, PWRMGTCR0_AV_IDLE_CNT + + mtspr SPRN_PWRMGTCR0, r3 + + blr + +#ifdef CONFIG_PPC_E500MC +_GLOBAL(__setup_cpu_e6500) + mflr r6 +#ifdef CONFIG_PPC64 + bl setup_altivec_ivors + /* Touch IVOR42 only if the CPU supports E.HV category */ + mfspr r10,SPRN_MMUCFG + rlwinm. r10,r10,0,MMUCFG_LPIDSIZE + beq 1f + bl setup_lrat_ivor +1: +#endif + bl setup_pw20_idle + bl setup_altivec_idle + bl __setup_cpu_e5500 + mtlr r6 + blr +#endif /* CONFIG_PPC_E500MC */ + +#ifdef CONFIG_PPC32 +#ifdef CONFIG_PPC_E500 +#ifndef CONFIG_PPC_E500MC +_GLOBAL(__setup_cpu_e500v1) +_GLOBAL(__setup_cpu_e500v2) + mflr r4 + bl __e500_icache_setup + bl __e500_dcache_setup + bl __setup_e500_ivors +#if defined(CONFIG_FSL_RIO) || defined(CONFIG_FSL_PCI) + /* Ensure that RFXE is set */ + mfspr r3,SPRN_HID1 + oris r3,r3,HID1_RFXE@h + mtspr SPRN_HID1,r3 +#endif + mtlr r4 + blr +#else /* CONFIG_PPC_E500MC */ +_GLOBAL(__setup_cpu_e500mc) +_GLOBAL(__setup_cpu_e5500) + mflr r5 + bl __e500_icache_setup + bl __e500_dcache_setup + bl __setup_e500mc_ivors + /* + * We only want to touch IVOR38-41 if we're running on hardware + * that supports category E.HV. The architectural way to determine + * this is MMUCFG[LPIDSIZE]. + */ + mfspr r3, SPRN_MMUCFG + rlwinm. r3, r3, 0, MMUCFG_LPIDSIZE + beq 1f + bl __setup_ehv_ivors + b 2f +1: + lwz r3, CPU_SPEC_FEATURES(r4) + /* We need this check as cpu_setup is also called for + * the secondary cores. So, if we have already cleared + * the feature on the primary core, avoid doing it on the + * secondary core. + */ + andi. r6, r3, CPU_FTR_EMB_HV + beq 2f + rlwinm r3, r3, 0, ~CPU_FTR_EMB_HV + stw r3, CPU_SPEC_FEATURES(r4) +2: + mtlr r5 + blr +#endif /* CONFIG_PPC_E500MC */ +#endif /* CONFIG_PPC_E500 */ +#endif /* CONFIG_PPC32 */ + +#ifdef CONFIG_PPC_BOOK3E_64 +_GLOBAL(__restore_cpu_e6500) + mflr r5 + bl setup_altivec_ivors + /* Touch IVOR42 only if the CPU supports E.HV category */ + mfspr r10,SPRN_MMUCFG + rlwinm. r10,r10,0,MMUCFG_LPIDSIZE + beq 1f + bl setup_lrat_ivor +1: + bl setup_pw20_idle + bl setup_altivec_idle + bl __restore_cpu_e5500 + mtlr r5 + blr + +_GLOBAL(__restore_cpu_e5500) + mflr r4 + bl __e500_icache_setup + bl __e500_dcache_setup + bl __setup_base_ivors + bl setup_perfmon_ivor + bl setup_doorbell_ivors + /* + * We only want to touch IVOR38-41 if we're running on hardware + * that supports category E.HV. The architectural way to determine + * this is MMUCFG[LPIDSIZE]. + */ + mfspr r10,SPRN_MMUCFG + rlwinm. r10,r10,0,MMUCFG_LPIDSIZE + beq 1f + bl setup_ehv_ivors +1: + mtlr r4 + blr + +_GLOBAL(__setup_cpu_e5500) + mflr r5 + bl __e500_icache_setup + bl __e500_dcache_setup + bl __setup_base_ivors + bl setup_perfmon_ivor + bl setup_doorbell_ivors + /* + * We only want to touch IVOR38-41 if we're running on hardware + * that supports category E.HV. The architectural way to determine + * this is MMUCFG[LPIDSIZE]. + */ + mfspr r10,SPRN_MMUCFG + rlwinm. r10,r10,0,MMUCFG_LPIDSIZE + beq 1f + bl setup_ehv_ivors + b 2f +1: + ld r10,CPU_SPEC_FEATURES(r4) + LOAD_REG_IMMEDIATE(r9,CPU_FTR_EMB_HV) + andc r10,r10,r9 + std r10,CPU_SPEC_FEATURES(r4) +2: + mtlr r5 + blr +#endif + +/* flush L1 data cache, it can apply to e500v2, e500mc and e5500 */ +_GLOBAL(flush_dcache_L1) + mfmsr r10 + wrteei 0 + + mfspr r3,SPRN_L1CFG0 + rlwinm r5,r3,9,3 /* Extract cache block size */ + twlgti r5,1 /* Only 32 and 64 byte cache blocks + * are currently defined. + */ + li r4,32 + subfic r6,r5,2 /* r6 = log2(1KiB / cache block size) - + * log2(number of ways) + */ + slw r5,r4,r5 /* r5 = cache block size */ + + rlwinm r7,r3,0,0xff /* Extract number of KiB in the cache */ + mulli r7,r7,13 /* An 8-way cache will require 13 + * loads per set. + */ + slw r7,r7,r6 + + /* save off HID0 and set DCFA */ + mfspr r8,SPRN_HID0 + ori r9,r8,HID0_DCFA@l + mtspr SPRN_HID0,r9 + isync + + LOAD_REG_IMMEDIATE(r6, KERNELBASE) + mr r4, r6 + mtctr r7 + +1: lwz r3,0(r4) /* Load... */ + add r4,r4,r5 + bdnz 1b + + msync + mr r4, r6 + mtctr r7 + +1: dcbf 0,r4 /* ...and flush. */ + add r4,r4,r5 + bdnz 1b + + /* restore HID0 */ + mtspr SPRN_HID0,r8 + isync + + wrtee r10 + + blr + +has_L2_cache: + /* skip L2 cache on P2040/P2040E as they have no L2 cache */ + mfspr r3, SPRN_SVR + /* shift right by 8 bits and clear E bit of SVR */ + rlwinm r4, r3, 24, ~0x800 + + lis r3, SVR_P2040@h + ori r3, r3, SVR_P2040@l + cmpw r4, r3 + beq 1f + + li r3, 1 + blr +1: + li r3, 0 + blr + +/* flush backside L2 cache */ +flush_backside_L2_cache: + mflr r10 + bl has_L2_cache + mtlr r10 + cmpwi r3, 0 + beq 2f + + /* Flush the L2 cache */ + mfspr r3, SPRN_L2CSR0 + ori r3, r3, L2CSR0_L2FL@l + msync + isync + mtspr SPRN_L2CSR0,r3 + isync + + /* check if it is complete */ +1: mfspr r3,SPRN_L2CSR0 + andi. r3, r3, L2CSR0_L2FL@l + bne 1b +2: + blr + +_GLOBAL(cpu_down_flush_e500v2) + mflr r0 + bl flush_dcache_L1 + mtlr r0 + blr + +_GLOBAL(cpu_down_flush_e500mc) +_GLOBAL(cpu_down_flush_e5500) + mflr r0 + bl flush_dcache_L1 + bl flush_backside_L2_cache + mtlr r0 + blr + +/* L1 Data Cache of e6500 contains no modified data, no flush is required */ +_GLOBAL(cpu_down_flush_e6500) + blr diff --git a/arch/powerpc/kernel/cpu_setup_pa6t.S b/arch/powerpc/kernel/cpu_setup_pa6t.S new file mode 100644 index 000000000..e6bfd4490 --- /dev/null +++ b/arch/powerpc/kernel/cpu_setup_pa6t.S @@ -0,0 +1,31 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2006-2007 PA Semi, Inc + * + * Maintained by: Olof Johansson <olof@lixom.net> + */ + +#include <asm/processor.h> +#include <asm/page.h> +#include <asm/cputable.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/cache.h> + +/* Right now, restore and setup are the same thing */ +_GLOBAL(__restore_cpu_pa6t) +_GLOBAL(__setup_cpu_pa6t) + /* Do nothing if not running in HV mode */ + mfmsr r0 + rldicl. r0,r0,4,63 + beqlr + + mfspr r0,SPRN_HID5 + ori r0,r0,0x38 + mtspr SPRN_HID5,r0 + + mfspr r0,SPRN_LPCR + ori r0,r0,0x7000 + mtspr SPRN_LPCR,r0 + + blr diff --git a/arch/powerpc/kernel/cpu_setup_power.c b/arch/powerpc/kernel/cpu_setup_power.c new file mode 100644 index 000000000..097c03366 --- /dev/null +++ b/arch/powerpc/kernel/cpu_setup_power.c @@ -0,0 +1,280 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright 2020, Jordan Niethe, IBM Corporation. + * + * This file contains low level CPU setup functions. + * Originally written in assembly by Benjamin Herrenschmidt & various other + * authors. + */ + +#include <asm/reg.h> +#include <asm/synch.h> +#include <linux/bitops.h> +#include <asm/cputable.h> +#include <asm/cpu_setup.h> + +/* Disable CPU_FTR_HVMODE and return false if MSR:HV is not set */ +static bool init_hvmode_206(struct cpu_spec *t) +{ + u64 msr; + + msr = mfmsr(); + if (msr & MSR_HV) + return true; + + t->cpu_features &= ~(CPU_FTR_HVMODE | CPU_FTR_P9_TM_HV_ASSIST); + return false; +} + +static void init_LPCR_ISA300(u64 lpcr, u64 lpes) +{ + /* POWER9 has no VRMASD */ + lpcr |= (lpes << LPCR_LPES_SH) & LPCR_LPES; + lpcr |= LPCR_PECE0|LPCR_PECE1|LPCR_PECE2; + lpcr |= (4ull << LPCR_DPFD_SH) & LPCR_DPFD; + lpcr &= ~LPCR_HDICE; /* clear HDICE */ + lpcr |= (4ull << LPCR_VC_SH); + mtspr(SPRN_LPCR, lpcr); + isync(); +} + +/* + * Setup a sane LPCR: + * Called with initial LPCR and desired LPES 2-bit value + * + * LPES = 0b01 (HSRR0/1 used for 0x500) + * PECE = 0b111 + * DPFD = 4 + * HDICE = 0 + * VC = 0b100 (VPM0=1, VPM1=0, ISL=0) + * VRMASD = 0b10000 (L=1, LP=00) + * + * Other bits untouched for now + */ +static void init_LPCR_ISA206(u64 lpcr, u64 lpes) +{ + lpcr |= (0x10ull << LPCR_VRMASD_SH) & LPCR_VRMASD; + init_LPCR_ISA300(lpcr, lpes); +} + +static void init_FSCR(void) +{ + u64 fscr; + + fscr = mfspr(SPRN_FSCR); + fscr |= FSCR_TAR|FSCR_EBB; + mtspr(SPRN_FSCR, fscr); +} + +static void init_FSCR_power9(void) +{ + u64 fscr; + + fscr = mfspr(SPRN_FSCR); + fscr |= FSCR_SCV; + mtspr(SPRN_FSCR, fscr); + init_FSCR(); +} + +static void init_FSCR_power10(void) +{ + u64 fscr; + + fscr = mfspr(SPRN_FSCR); + fscr |= FSCR_PREFIX; + mtspr(SPRN_FSCR, fscr); + init_FSCR_power9(); +} + +static void init_HFSCR(void) +{ + u64 hfscr; + + hfscr = mfspr(SPRN_HFSCR); + hfscr |= HFSCR_TAR|HFSCR_TM|HFSCR_BHRB|HFSCR_PM|HFSCR_DSCR|\ + HFSCR_VECVSX|HFSCR_FP|HFSCR_EBB|HFSCR_MSGP; + mtspr(SPRN_HFSCR, hfscr); +} + +static void init_PMU_HV(void) +{ + mtspr(SPRN_MMCRC, 0); +} + +static void init_PMU_HV_ISA207(void) +{ + mtspr(SPRN_MMCRH, 0); +} + +static void init_PMU(void) +{ + mtspr(SPRN_MMCRA, 0); + mtspr(SPRN_MMCR0, MMCR0_FC); + mtspr(SPRN_MMCR1, 0); + mtspr(SPRN_MMCR2, 0); +} + +static void init_PMU_ISA207(void) +{ + mtspr(SPRN_MMCRS, 0); +} + +static void init_PMU_ISA31(void) +{ + mtspr(SPRN_MMCR3, 0); + mtspr(SPRN_MMCRA, MMCRA_BHRB_DISABLE); + mtspr(SPRN_MMCR0, MMCR0_FC | MMCR0_PMCCEXT); +} + +/* + * Note that we can be called twice of pseudo-PVRs. + * The parameter offset is not used. + */ + +void __setup_cpu_power7(unsigned long offset, struct cpu_spec *t) +{ + if (!init_hvmode_206(t)) + return; + + mtspr(SPRN_LPID, 0); + mtspr(SPRN_AMOR, ~0); + mtspr(SPRN_PCR, PCR_MASK); + init_LPCR_ISA206(mfspr(SPRN_LPCR), LPCR_LPES1 >> LPCR_LPES_SH); +} + +void __restore_cpu_power7(void) +{ + u64 msr; + + msr = mfmsr(); + if (!(msr & MSR_HV)) + return; + + mtspr(SPRN_LPID, 0); + mtspr(SPRN_AMOR, ~0); + mtspr(SPRN_PCR, PCR_MASK); + init_LPCR_ISA206(mfspr(SPRN_LPCR), LPCR_LPES1 >> LPCR_LPES_SH); +} + +void __setup_cpu_power8(unsigned long offset, struct cpu_spec *t) +{ + init_FSCR(); + init_PMU(); + init_PMU_ISA207(); + + if (!init_hvmode_206(t)) + return; + + mtspr(SPRN_LPID, 0); + mtspr(SPRN_AMOR, ~0); + mtspr(SPRN_PCR, PCR_MASK); + init_LPCR_ISA206(mfspr(SPRN_LPCR) | LPCR_PECEDH, 0); /* LPES = 0 */ + init_HFSCR(); + init_PMU_HV(); + init_PMU_HV_ISA207(); +} + +void __restore_cpu_power8(void) +{ + u64 msr; + + init_FSCR(); + init_PMU(); + init_PMU_ISA207(); + + msr = mfmsr(); + if (!(msr & MSR_HV)) + return; + + mtspr(SPRN_LPID, 0); + mtspr(SPRN_AMOR, ~0); + mtspr(SPRN_PCR, PCR_MASK); + init_LPCR_ISA206(mfspr(SPRN_LPCR) | LPCR_PECEDH, 0); /* LPES = 0 */ + init_HFSCR(); + init_PMU_HV(); + init_PMU_HV_ISA207(); +} + +void __setup_cpu_power9(unsigned long offset, struct cpu_spec *t) +{ + init_FSCR_power9(); + init_PMU(); + + if (!init_hvmode_206(t)) + return; + + mtspr(SPRN_PSSCR, 0); + mtspr(SPRN_LPID, 0); + mtspr(SPRN_PID, 0); + mtspr(SPRN_AMOR, ~0); + mtspr(SPRN_PCR, PCR_MASK); + init_LPCR_ISA300((mfspr(SPRN_LPCR) | LPCR_PECEDH | LPCR_PECE_HVEE |\ + LPCR_HVICE | LPCR_HEIC) & ~(LPCR_UPRT | LPCR_HR), 0); + init_HFSCR(); + init_PMU_HV(); +} + +void __restore_cpu_power9(void) +{ + u64 msr; + + init_FSCR_power9(); + init_PMU(); + + msr = mfmsr(); + if (!(msr & MSR_HV)) + return; + + mtspr(SPRN_PSSCR, 0); + mtspr(SPRN_LPID, 0); + mtspr(SPRN_PID, 0); + mtspr(SPRN_AMOR, ~0); + mtspr(SPRN_PCR, PCR_MASK); + init_LPCR_ISA300((mfspr(SPRN_LPCR) | LPCR_PECEDH | LPCR_PECE_HVEE |\ + LPCR_HVICE | LPCR_HEIC) & ~(LPCR_UPRT | LPCR_HR), 0); + init_HFSCR(); + init_PMU_HV(); +} + +void __setup_cpu_power10(unsigned long offset, struct cpu_spec *t) +{ + init_FSCR_power10(); + init_PMU(); + init_PMU_ISA31(); + + if (!init_hvmode_206(t)) + return; + + mtspr(SPRN_PSSCR, 0); + mtspr(SPRN_LPID, 0); + mtspr(SPRN_PID, 0); + mtspr(SPRN_AMOR, ~0); + mtspr(SPRN_PCR, PCR_MASK); + init_LPCR_ISA300((mfspr(SPRN_LPCR) | LPCR_PECEDH | LPCR_PECE_HVEE |\ + LPCR_HVICE | LPCR_HEIC) & ~(LPCR_UPRT | LPCR_HR), 0); + init_HFSCR(); + init_PMU_HV(); +} + +void __restore_cpu_power10(void) +{ + u64 msr; + + init_FSCR_power10(); + init_PMU(); + init_PMU_ISA31(); + + msr = mfmsr(); + if (!(msr & MSR_HV)) + return; + + mtspr(SPRN_PSSCR, 0); + mtspr(SPRN_LPID, 0); + mtspr(SPRN_PID, 0); + mtspr(SPRN_AMOR, ~0); + mtspr(SPRN_PCR, PCR_MASK); + init_LPCR_ISA300((mfspr(SPRN_LPCR) | LPCR_PECEDH | LPCR_PECE_HVEE |\ + LPCR_HVICE | LPCR_HEIC) & ~(LPCR_UPRT | LPCR_HR), 0); + init_HFSCR(); + init_PMU_HV(); +} diff --git a/arch/powerpc/kernel/cpu_setup_ppc970.S b/arch/powerpc/kernel/cpu_setup_ppc970.S new file mode 100644 index 000000000..f0c07e70f --- /dev/null +++ b/arch/powerpc/kernel/cpu_setup_ppc970.S @@ -0,0 +1,205 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * This file contains low level CPU setup functions. + * Copyright (C) 2003 Benjamin Herrenschmidt (benh@kernel.crashing.org) + */ + +#include <asm/processor.h> +#include <asm/page.h> +#include <asm/cputable.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/cache.h> + +_GLOBAL(__cpu_preinit_ppc970) + /* Do nothing if not running in HV mode */ + mfmsr r0 + rldicl. r0,r0,4,63 + beqlr + + /* Make sure HID4:rm_ci is off before MMU is turned off, that large + * pages are enabled with HID4:61 and clear HID5:DCBZ_size and + * HID5:DCBZ32_ill + */ + li r0,0 + mfspr r3,SPRN_HID4 + rldimi r3,r0,40,23 /* clear bit 23 (rm_ci) */ + rldimi r3,r0,2,61 /* clear bit 61 (lg_pg_en) */ + sync + mtspr SPRN_HID4,r3 + isync + sync + mfspr r3,SPRN_HID5 + rldimi r3,r0,6,56 /* clear bits 56 & 57 (DCBZ*) */ + sync + mtspr SPRN_HID5,r3 + isync + sync + + /* Setup some basic HID1 features */ + mfspr r0,SPRN_HID1 + li r3,0x1200 /* enable i-fetch cacheability */ + sldi r3,r3,44 /* and prefetch */ + or r0,r0,r3 + mtspr SPRN_HID1,r0 + mtspr SPRN_HID1,r0 + isync + + /* Clear HIOR */ + li r0,0 + sync + mtspr SPRN_HIOR,0 /* Clear interrupt prefix */ + isync + blr + +/* Definitions for the table use to save CPU states */ +#define CS_HID0 0 +#define CS_HID1 8 +#define CS_HID4 16 +#define CS_HID5 24 +#define CS_SIZE 32 + + .data + .balign L1_CACHE_BYTES,0 +cpu_state_storage: + .space CS_SIZE + .balign L1_CACHE_BYTES,0 + .text + + +_GLOBAL(__setup_cpu_ppc970) + /* Do nothing if not running in HV mode */ + mfmsr r0 + rldicl. r0,r0,4,63 + beq no_hv_mode + + mfspr r0,SPRN_HID0 + li r11,5 /* clear DOZE and SLEEP */ + rldimi r0,r11,52,8 /* set NAP and DPM */ + li r11,0 + rldimi r0,r11,32,31 /* clear EN_ATTN */ + b load_hids /* Jump to shared code */ + + +_GLOBAL(__setup_cpu_ppc970MP) + /* Do nothing if not running in HV mode */ + mfmsr r0 + rldicl. r0,r0,4,63 + beq no_hv_mode + + mfspr r0,SPRN_HID0 + li r11,0x15 /* clear DOZE and SLEEP */ + rldimi r0,r11,52,6 /* set DEEPNAP, NAP and DPM */ + li r11,0 + rldimi r0,r11,32,31 /* clear EN_ATTN */ + +load_hids: + mtspr SPRN_HID0,r0 + mfspr r0,SPRN_HID0 + mfspr r0,SPRN_HID0 + mfspr r0,SPRN_HID0 + mfspr r0,SPRN_HID0 + mfspr r0,SPRN_HID0 + mfspr r0,SPRN_HID0 + sync + isync + + /* Try to set LPES = 01 in HID4 */ + mfspr r0,SPRN_HID4 + clrldi r0,r0,1 /* clear LPES0 */ + ori r0,r0,HID4_LPES1 /* set LPES1 */ + sync + mtspr SPRN_HID4,r0 + isync + + /* Save away cpu state */ + LOAD_REG_ADDR(r5,cpu_state_storage) + + /* Save HID0,1,4 and 5 */ + mfspr r3,SPRN_HID0 + std r3,CS_HID0(r5) + mfspr r3,SPRN_HID1 + std r3,CS_HID1(r5) + mfspr r4,SPRN_HID4 + std r4,CS_HID4(r5) + mfspr r3,SPRN_HID5 + std r3,CS_HID5(r5) + + /* See if we successfully set LPES1 to 1; if not we are in Apple mode */ + andi. r4,r4,HID4_LPES1 + bnelr + +no_hv_mode: + /* Disable CPU_FTR_HVMODE and exit, since we don't have HV mode */ + ld r5,CPU_SPEC_FEATURES(r4) + LOAD_REG_IMMEDIATE(r6,CPU_FTR_HVMODE) + andc r5,r5,r6 + std r5,CPU_SPEC_FEATURES(r4) + blr + +/* Called with no MMU context (typically MSR:IR/DR off) to + * restore CPU state as backed up by the previous + * function. This does not include cache setting + */ +_GLOBAL(__restore_cpu_ppc970) + /* Do nothing if not running in HV mode */ + mfmsr r0 + rldicl. r0,r0,4,63 + beqlr + + LOAD_REG_ADDR(r5,cpu_state_storage) + /* Before accessing memory, we make sure rm_ci is clear */ + li r0,0 + mfspr r3,SPRN_HID4 + rldimi r3,r0,40,23 /* clear bit 23 (rm_ci) */ + sync + mtspr SPRN_HID4,r3 + isync + sync + + /* Clear interrupt prefix */ + li r0,0 + sync + mtspr SPRN_HIOR,0 + isync + + /* Restore HID0 */ + ld r3,CS_HID0(r5) + sync + isync + mtspr SPRN_HID0,r3 + mfspr r3,SPRN_HID0 + mfspr r3,SPRN_HID0 + mfspr r3,SPRN_HID0 + mfspr r3,SPRN_HID0 + mfspr r3,SPRN_HID0 + mfspr r3,SPRN_HID0 + sync + isync + + /* Restore HID1 */ + ld r3,CS_HID1(r5) + sync + isync + mtspr SPRN_HID1,r3 + mtspr SPRN_HID1,r3 + sync + isync + + /* Restore HID4 */ + ld r3,CS_HID4(r5) + sync + isync + mtspr SPRN_HID4,r3 + sync + isync + + /* Restore HID5 */ + ld r3,CS_HID5(r5) + sync + isync + mtspr SPRN_HID5,r3 + sync + isync + blr + diff --git a/arch/powerpc/kernel/cpu_specs.h b/arch/powerpc/kernel/cpu_specs.h new file mode 100644 index 000000000..85ded3f77 --- /dev/null +++ b/arch/powerpc/kernel/cpu_specs.h @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#ifdef CONFIG_40x +#include "cpu_specs_40x.h" +#endif + +#ifdef CONFIG_PPC_47x +#include "cpu_specs_47x.h" +#elif defined(CONFIG_44x) +#include "cpu_specs_44x.h" +#endif + +#ifdef CONFIG_PPC_8xx +#include "cpu_specs_8xx.h" +#endif + +#ifdef CONFIG_PPC_E500MC +#include "cpu_specs_e500mc.h" +#elif defined(CONFIG_PPC_85xx) +#include "cpu_specs_85xx.h" +#endif + +#ifdef CONFIG_PPC_BOOK3S_32 +#include "cpu_specs_book3s_32.h" +#endif + +#ifdef CONFIG_PPC_BOOK3S_64 +#include "cpu_specs_book3s_64.h" +#endif diff --git a/arch/powerpc/kernel/cpu_specs_40x.h b/arch/powerpc/kernel/cpu_specs_40x.h new file mode 100644 index 000000000..a1362a75b --- /dev/null +++ b/arch/powerpc/kernel/cpu_specs_40x.h @@ -0,0 +1,280 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org) + */ + +static struct cpu_spec cpu_specs[] __initdata = { + { /* STB 04xxx */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x41810000, + .cpu_name = "STB04xxx", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { /* NP405L */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x41610000, + .cpu_name = "NP405L", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { /* NP4GS3 */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x40B10000, + .cpu_name = "NP4GS3", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { /* NP405H */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x41410000, + .cpu_name = "NP405H", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { /* 405GPr */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x50910000, + .cpu_name = "405GPr", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { /* STBx25xx */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x51510000, + .cpu_name = "STBx25xx", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { /* 405LP */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x41F10000, + .cpu_name = "405LP", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { /* 405EP */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x51210000, + .cpu_name = "405EP", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { /* 405EX Rev. A/B with Security */ + .pvr_mask = 0xffff000f, + .pvr_value = 0x12910007, + .cpu_name = "405EX Rev. A/B", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { /* 405EX Rev. C without Security */ + .pvr_mask = 0xffff000f, + .pvr_value = 0x1291000d, + .cpu_name = "405EX Rev. C", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { /* 405EX Rev. C with Security */ + .pvr_mask = 0xffff000f, + .pvr_value = 0x1291000f, + .cpu_name = "405EX Rev. C", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { /* 405EX Rev. D without Security */ + .pvr_mask = 0xffff000f, + .pvr_value = 0x12910003, + .cpu_name = "405EX Rev. D", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { /* 405EX Rev. D with Security */ + .pvr_mask = 0xffff000f, + .pvr_value = 0x12910005, + .cpu_name = "405EX Rev. D", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { /* 405EXr Rev. A/B without Security */ + .pvr_mask = 0xffff000f, + .pvr_value = 0x12910001, + .cpu_name = "405EXr Rev. A/B", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { /* 405EXr Rev. C without Security */ + .pvr_mask = 0xffff000f, + .pvr_value = 0x12910009, + .cpu_name = "405EXr Rev. C", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { /* 405EXr Rev. C with Security */ + .pvr_mask = 0xffff000f, + .pvr_value = 0x1291000b, + .cpu_name = "405EXr Rev. C", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { /* 405EXr Rev. D without Security */ + .pvr_mask = 0xffff000f, + .pvr_value = 0x12910000, + .cpu_name = "405EXr Rev. D", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { /* 405EXr Rev. D with Security */ + .pvr_mask = 0xffff000f, + .pvr_value = 0x12910002, + .cpu_name = "405EXr Rev. D", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { + /* 405EZ */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x41510000, + .cpu_name = "405EZ", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { /* APM8018X */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x7ff11432, + .cpu_name = "APM8018X", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + }, + { /* default match */ + .pvr_mask = 0x00000000, + .pvr_value = 0x00000000, + .cpu_name = "(generic 40x PPC)", + .cpu_features = CPU_FTRS_40X, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | + PPC_FEATURE_HAS_4xxMAC, + .mmu_features = MMU_FTR_TYPE_40x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc405", + } +}; diff --git a/arch/powerpc/kernel/cpu_specs_44x.h b/arch/powerpc/kernel/cpu_specs_44x.h new file mode 100644 index 000000000..69c4cdc0c --- /dev/null +++ b/arch/powerpc/kernel/cpu_specs_44x.h @@ -0,0 +1,304 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org) + */ + +#define COMMON_USER_BOOKE (PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | \ + PPC_FEATURE_BOOKE) + +static struct cpu_spec cpu_specs[] __initdata = { + { + .pvr_mask = 0xf0000fff, + .pvr_value = 0x40000850, + .cpu_name = "440GR Rev. A", + .cpu_features = CPU_FTRS_44X, + .cpu_user_features = COMMON_USER_BOOKE, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc440", + }, + { /* Use logical PVR for 440EP (logical pvr = pvr | 0x8) */ + .pvr_mask = 0xf0000fff, + .pvr_value = 0x40000858, + .cpu_name = "440EP Rev. A", + .cpu_features = CPU_FTRS_44X, + .cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_440ep, + .machine_check = machine_check_4xx, + .platform = "ppc440", + }, + { + .pvr_mask = 0xf0000fff, + .pvr_value = 0x400008d3, + .cpu_name = "440GR Rev. B", + .cpu_features = CPU_FTRS_44X, + .cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc440", + }, + { /* Matches both physical and logical PVR for 440EP (logical pvr = pvr | 0x8) */ + .pvr_mask = 0xf0000ff7, + .pvr_value = 0x400008d4, + .cpu_name = "440EP Rev. C", + .cpu_features = CPU_FTRS_44X, + .cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_440ep, + .machine_check = machine_check_4xx, + .platform = "ppc440", + }, + { /* Use logical PVR for 440EP (logical pvr = pvr | 0x8) */ + .pvr_mask = 0xf0000fff, + .pvr_value = 0x400008db, + .cpu_name = "440EP Rev. B", + .cpu_features = CPU_FTRS_44X, + .cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_440ep, + .machine_check = machine_check_4xx, + .platform = "ppc440", + }, + { /* 440GRX */ + .pvr_mask = 0xf0000ffb, + .pvr_value = 0x200008D0, + .cpu_name = "440GRX", + .cpu_features = CPU_FTRS_44X, + .cpu_user_features = COMMON_USER_BOOKE, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_440grx, + .machine_check = machine_check_440A, + .platform = "ppc440", + }, + { /* Use logical PVR for 440EPx (logical pvr = pvr | 0x8) */ + .pvr_mask = 0xf0000ffb, + .pvr_value = 0x200008D8, + .cpu_name = "440EPX", + .cpu_features = CPU_FTRS_44X, + .cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_440epx, + .machine_check = machine_check_440A, + .platform = "ppc440", + }, + { /* 440GP Rev. B */ + .pvr_mask = 0xf0000fff, + .pvr_value = 0x40000440, + .cpu_name = "440GP Rev. B", + .cpu_features = CPU_FTRS_44X, + .cpu_user_features = COMMON_USER_BOOKE, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc440gp", + }, + { /* 440GP Rev. C */ + .pvr_mask = 0xf0000fff, + .pvr_value = 0x40000481, + .cpu_name = "440GP Rev. C", + .cpu_features = CPU_FTRS_44X, + .cpu_user_features = COMMON_USER_BOOKE, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc440gp", + }, + { /* 440GX Rev. A */ + .pvr_mask = 0xf0000fff, + .pvr_value = 0x50000850, + .cpu_name = "440GX Rev. A", + .cpu_features = CPU_FTRS_44X, + .cpu_user_features = COMMON_USER_BOOKE, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_440gx, + .machine_check = machine_check_440A, + .platform = "ppc440", + }, + { /* 440GX Rev. B */ + .pvr_mask = 0xf0000fff, + .pvr_value = 0x50000851, + .cpu_name = "440GX Rev. B", + .cpu_features = CPU_FTRS_44X, + .cpu_user_features = COMMON_USER_BOOKE, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_440gx, + .machine_check = machine_check_440A, + .platform = "ppc440", + }, + { /* 440GX Rev. C */ + .pvr_mask = 0xf0000fff, + .pvr_value = 0x50000892, + .cpu_name = "440GX Rev. C", + .cpu_features = CPU_FTRS_44X, + .cpu_user_features = COMMON_USER_BOOKE, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_440gx, + .machine_check = machine_check_440A, + .platform = "ppc440", + }, + { /* 440GX Rev. F */ + .pvr_mask = 0xf0000fff, + .pvr_value = 0x50000894, + .cpu_name = "440GX Rev. F", + .cpu_features = CPU_FTRS_44X, + .cpu_user_features = COMMON_USER_BOOKE, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_440gx, + .machine_check = machine_check_440A, + .platform = "ppc440", + }, + { /* 440SP Rev. A */ + .pvr_mask = 0xfff00fff, + .pvr_value = 0x53200891, + .cpu_name = "440SP Rev. A", + .cpu_features = CPU_FTRS_44X, + .cpu_user_features = COMMON_USER_BOOKE, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc440", + }, + { /* 440SPe Rev. A */ + .pvr_mask = 0xfff00fff, + .pvr_value = 0x53400890, + .cpu_name = "440SPe Rev. A", + .cpu_features = CPU_FTRS_44X, + .cpu_user_features = COMMON_USER_BOOKE, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_440spe, + .machine_check = machine_check_440A, + .platform = "ppc440", + }, + { /* 440SPe Rev. B */ + .pvr_mask = 0xfff00fff, + .pvr_value = 0x53400891, + .cpu_name = "440SPe Rev. B", + .cpu_features = CPU_FTRS_44X, + .cpu_user_features = COMMON_USER_BOOKE, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_440spe, + .machine_check = machine_check_440A, + .platform = "ppc440", + }, + { /* 460EX */ + .pvr_mask = 0xffff0006, + .pvr_value = 0x13020002, + .cpu_name = "460EX", + .cpu_features = CPU_FTRS_440x6, + .cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_460ex, + .machine_check = machine_check_440A, + .platform = "ppc440", + }, + { /* 460EX Rev B */ + .pvr_mask = 0xffff0007, + .pvr_value = 0x13020004, + .cpu_name = "460EX Rev. B", + .cpu_features = CPU_FTRS_440x6, + .cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_460ex, + .machine_check = machine_check_440A, + .platform = "ppc440", + }, + { /* 460GT */ + .pvr_mask = 0xffff0006, + .pvr_value = 0x13020000, + .cpu_name = "460GT", + .cpu_features = CPU_FTRS_440x6, + .cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_460gt, + .machine_check = machine_check_440A, + .platform = "ppc440", + }, + { /* 460GT Rev B */ + .pvr_mask = 0xffff0007, + .pvr_value = 0x13020005, + .cpu_name = "460GT Rev. B", + .cpu_features = CPU_FTRS_440x6, + .cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_460gt, + .machine_check = machine_check_440A, + .platform = "ppc440", + }, + { /* 460SX */ + .pvr_mask = 0xffffff00, + .pvr_value = 0x13541800, + .cpu_name = "460SX", + .cpu_features = CPU_FTRS_44X, + .cpu_user_features = COMMON_USER_BOOKE, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_460sx, + .machine_check = machine_check_440A, + .platform = "ppc440", + }, + { /* 464 in APM821xx */ + .pvr_mask = 0xfffffff0, + .pvr_value = 0x12C41C80, + .cpu_name = "APM821XX", + .cpu_features = CPU_FTRS_44X, + .cpu_user_features = COMMON_USER_BOOKE | + PPC_FEATURE_HAS_FPU, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_apm821xx, + .machine_check = machine_check_440A, + .platform = "ppc440", + }, + { /* default match */ + .pvr_mask = 0x00000000, + .pvr_value = 0x00000000, + .cpu_name = "(generic 44x PPC)", + .cpu_features = CPU_FTRS_44X, + .cpu_user_features = COMMON_USER_BOOKE, + .mmu_features = MMU_FTR_TYPE_44x, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_4xx, + .platform = "ppc440", + } +}; diff --git a/arch/powerpc/kernel/cpu_specs_47x.h b/arch/powerpc/kernel/cpu_specs_47x.h new file mode 100644 index 000000000..3143cd504 --- /dev/null +++ b/arch/powerpc/kernel/cpu_specs_47x.h @@ -0,0 +1,74 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org) + */ + +#define COMMON_USER_BOOKE (PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | \ + PPC_FEATURE_BOOKE) + +static struct cpu_spec cpu_specs[] __initdata = { + { /* 476 DD2 core */ + .pvr_mask = 0xffffffff, + .pvr_value = 0x11a52080, + .cpu_name = "476", + .cpu_features = CPU_FTRS_47X | CPU_FTR_476_DD2, + .cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU, + .mmu_features = MMU_FTR_TYPE_47x | MMU_FTR_USE_TLBIVAX_BCAST | + MMU_FTR_LOCK_BCAST_INVAL, + .icache_bsize = 32, + .dcache_bsize = 128, + .machine_check = machine_check_47x, + .platform = "ppc470", + }, + { /* 476fpe */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x7ff50000, + .cpu_name = "476fpe", + .cpu_features = CPU_FTRS_47X | CPU_FTR_476_DD2, + .cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU, + .mmu_features = MMU_FTR_TYPE_47x | MMU_FTR_USE_TLBIVAX_BCAST | + MMU_FTR_LOCK_BCAST_INVAL, + .icache_bsize = 32, + .dcache_bsize = 128, + .machine_check = machine_check_47x, + .platform = "ppc470", + }, + { /* 476 iss */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x00050000, + .cpu_name = "476", + .cpu_features = CPU_FTRS_47X, + .cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU, + .mmu_features = MMU_FTR_TYPE_47x | MMU_FTR_USE_TLBIVAX_BCAST | + MMU_FTR_LOCK_BCAST_INVAL, + .icache_bsize = 32, + .dcache_bsize = 128, + .machine_check = machine_check_47x, + .platform = "ppc470", + }, + { /* 476 others */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x11a50000, + .cpu_name = "476", + .cpu_features = CPU_FTRS_47X, + .cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU, + .mmu_features = MMU_FTR_TYPE_47x | MMU_FTR_USE_TLBIVAX_BCAST | + MMU_FTR_LOCK_BCAST_INVAL, + .icache_bsize = 32, + .dcache_bsize = 128, + .machine_check = machine_check_47x, + .platform = "ppc470", + }, + { /* default match */ + .pvr_mask = 0x00000000, + .pvr_value = 0x00000000, + .cpu_name = "(generic 47x PPC)", + .cpu_features = CPU_FTRS_47X, + .cpu_user_features = COMMON_USER_BOOKE, + .mmu_features = MMU_FTR_TYPE_47x, + .icache_bsize = 32, + .dcache_bsize = 128, + .machine_check = machine_check_47x, + .platform = "ppc470", + } +}; diff --git a/arch/powerpc/kernel/cpu_specs_85xx.h b/arch/powerpc/kernel/cpu_specs_85xx.h new file mode 100644 index 000000000..aaae202c1 --- /dev/null +++ b/arch/powerpc/kernel/cpu_specs_85xx.h @@ -0,0 +1,57 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org) + */ + +#define COMMON_USER_BOOKE (PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | \ + PPC_FEATURE_BOOKE) + +static struct cpu_spec cpu_specs[] __initdata = { + { /* e500 */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x80200000, + .cpu_name = "e500", + .cpu_features = CPU_FTRS_E500, + .cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_SPE_COMP | + PPC_FEATURE_HAS_EFP_SINGLE_COMP, + .cpu_user_features2 = PPC_FEATURE2_ISEL, + .mmu_features = MMU_FTR_TYPE_FSL_E, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .cpu_setup = __setup_cpu_e500v1, + .machine_check = machine_check_e500, + .platform = "ppc8540", + }, + { /* e500v2 */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x80210000, + .cpu_name = "e500v2", + .cpu_features = CPU_FTRS_E500_2, + .cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_SPE_COMP | + PPC_FEATURE_HAS_EFP_SINGLE_COMP | + PPC_FEATURE_HAS_EFP_DOUBLE_COMP, + .cpu_user_features2 = PPC_FEATURE2_ISEL, + .mmu_features = MMU_FTR_TYPE_FSL_E | MMU_FTR_BIG_PHYS, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .cpu_setup = __setup_cpu_e500v2, + .machine_check = machine_check_e500, + .platform = "ppc8548", + .cpu_down_flush = cpu_down_flush_e500v2, + }, + { /* default match */ + .pvr_mask = 0x00000000, + .pvr_value = 0x00000000, + .cpu_name = "(generic E500 PPC)", + .cpu_features = CPU_FTRS_E500, + .cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_SPE_COMP | + PPC_FEATURE_HAS_EFP_SINGLE_COMP, + .mmu_features = MMU_FTR_TYPE_FSL_E, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_e500, + .platform = "powerpc", + } +}; diff --git a/arch/powerpc/kernel/cpu_specs_8xx.h b/arch/powerpc/kernel/cpu_specs_8xx.h new file mode 100644 index 000000000..93ddbc202 --- /dev/null +++ b/arch/powerpc/kernel/cpu_specs_8xx.h @@ -0,0 +1,23 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org) + */ + +static struct cpu_spec cpu_specs[] __initdata = { + { /* 8xx */ + .pvr_mask = 0xffff0000, + .pvr_value = PVR_8xx, + .cpu_name = "8xx", + /* + * CPU_FTR_MAYBE_CAN_DOZE is possible, + * if the 8xx code is there.... + */ + .cpu_features = CPU_FTRS_8XX, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU, + .mmu_features = MMU_FTR_TYPE_8xx, + .icache_bsize = 16, + .dcache_bsize = 16, + .machine_check = machine_check_8xx, + .platform = "ppc823", + }, +}; diff --git a/arch/powerpc/kernel/cpu_specs_book3s_32.h b/arch/powerpc/kernel/cpu_specs_book3s_32.h new file mode 100644 index 000000000..3714634d1 --- /dev/null +++ b/arch/powerpc/kernel/cpu_specs_book3s_32.h @@ -0,0 +1,605 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org) + */ + +#define COMMON_USER (PPC_FEATURE_32 | PPC_FEATURE_HAS_FPU | \ + PPC_FEATURE_HAS_MMU) + +static struct cpu_spec cpu_specs[] __initdata = { +#ifdef CONFIG_PPC_BOOK3S_603 + { /* 603 */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x00030000, + .cpu_name = "603", + .cpu_features = CPU_FTRS_603, + .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE, + .mmu_features = 0, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_603, + .machine_check = machine_check_generic, + .platform = "ppc603", + }, + { /* 603e */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x00060000, + .cpu_name = "603e", + .cpu_features = CPU_FTRS_603, + .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE, + .mmu_features = 0, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_603, + .machine_check = machine_check_generic, + .platform = "ppc603", + }, + { /* 603ev */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x00070000, + .cpu_name = "603ev", + .cpu_features = CPU_FTRS_603, + .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE, + .mmu_features = 0, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_603, + .machine_check = machine_check_generic, + .platform = "ppc603", + }, + { /* 82xx (8240, 8245, 8260 are all 603e cores) */ + .pvr_mask = 0x7fff0000, + .pvr_value = 0x00810000, + .cpu_name = "82xx", + .cpu_features = CPU_FTRS_82XX, + .cpu_user_features = COMMON_USER, + .mmu_features = 0, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_603, + .machine_check = machine_check_generic, + .platform = "ppc603", + }, + { /* All G2_LE (603e core, plus some) have the same pvr */ + .pvr_mask = 0x7fff0000, + .pvr_value = 0x00820000, + .cpu_name = "G2_LE", + .cpu_features = CPU_FTRS_G2_LE, + .cpu_user_features = COMMON_USER, + .mmu_features = MMU_FTR_USE_HIGH_BATS, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_603, + .machine_check = machine_check_generic, + .platform = "ppc603", + }, +#ifdef CONFIG_PPC_83xx + { /* e300c1 (a 603e core, plus some) on 83xx */ + .pvr_mask = 0x7fff0000, + .pvr_value = 0x00830000, + .cpu_name = "e300c1", + .cpu_features = CPU_FTRS_E300, + .cpu_user_features = COMMON_USER, + .mmu_features = MMU_FTR_USE_HIGH_BATS, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_603, + .machine_check = machine_check_83xx, + .platform = "ppc603", + }, + { /* e300c2 (an e300c1 core, plus some, minus FPU) on 83xx */ + .pvr_mask = 0x7fff0000, + .pvr_value = 0x00840000, + .cpu_name = "e300c2", + .cpu_features = CPU_FTRS_E300C2, + .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU, + .mmu_features = MMU_FTR_USE_HIGH_BATS | MMU_FTR_NEED_DTLB_SW_LRU, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_603, + .machine_check = machine_check_83xx, + .platform = "ppc603", + }, + { /* e300c3 (e300c1, plus one IU, half cache size) on 83xx */ + .pvr_mask = 0x7fff0000, + .pvr_value = 0x00850000, + .cpu_name = "e300c3", + .cpu_features = CPU_FTRS_E300, + .cpu_user_features = COMMON_USER, + .mmu_features = MMU_FTR_USE_HIGH_BATS | MMU_FTR_NEED_DTLB_SW_LRU, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_603, + .machine_check = machine_check_83xx, + .num_pmcs = 4, + .platform = "ppc603", + }, + { /* e300c4 (e300c1, plus one IU) */ + .pvr_mask = 0x7fff0000, + .pvr_value = 0x00860000, + .cpu_name = "e300c4", + .cpu_features = CPU_FTRS_E300, + .cpu_user_features = COMMON_USER, + .mmu_features = MMU_FTR_USE_HIGH_BATS | MMU_FTR_NEED_DTLB_SW_LRU, + .icache_bsize = 32, + .dcache_bsize = 32, + .cpu_setup = __setup_cpu_603, + .machine_check = machine_check_83xx, + .num_pmcs = 4, + .platform = "ppc603", + }, +#endif +#endif /* CONFIG_PPC_BOOK3S_603 */ +#ifdef CONFIG_PPC_BOOK3S_604 + { /* 604 */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x00040000, + .cpu_name = "604", + .cpu_features = CPU_FTRS_604, + .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 2, + .cpu_setup = __setup_cpu_604, + .machine_check = machine_check_generic, + .platform = "ppc604", + }, + { /* 604e */ + .pvr_mask = 0xfffff000, + .pvr_value = 0x00090000, + .cpu_name = "604e", + .cpu_features = CPU_FTRS_604, + .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .cpu_setup = __setup_cpu_604, + .machine_check = machine_check_generic, + .platform = "ppc604", + }, + { /* 604r */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x00090000, + .cpu_name = "604r", + .cpu_features = CPU_FTRS_604, + .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .cpu_setup = __setup_cpu_604, + .machine_check = machine_check_generic, + .platform = "ppc604", + }, + { /* 604ev */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x000a0000, + .cpu_name = "604ev", + .cpu_features = CPU_FTRS_604, + .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .cpu_setup = __setup_cpu_604, + .machine_check = machine_check_generic, + .platform = "ppc604", + }, + { /* 740/750 (0x4202, don't support TAU ?) */ + .pvr_mask = 0xffffffff, + .pvr_value = 0x00084202, + .cpu_name = "740/750", + .cpu_features = CPU_FTRS_740_NOTAU, + .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .cpu_setup = __setup_cpu_750, + .machine_check = machine_check_generic, + .platform = "ppc750", + }, + { /* 750CX (80100 and 8010x?) */ + .pvr_mask = 0xfffffff0, + .pvr_value = 0x00080100, + .cpu_name = "750CX", + .cpu_features = CPU_FTRS_750, + .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .cpu_setup = __setup_cpu_750cx, + .machine_check = machine_check_generic, + .platform = "ppc750", + }, + { /* 750CX (82201 and 82202) */ + .pvr_mask = 0xfffffff0, + .pvr_value = 0x00082200, + .cpu_name = "750CX", + .cpu_features = CPU_FTRS_750, + .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_750cx, + .machine_check = machine_check_generic, + .platform = "ppc750", + }, + { /* 750CXe (82214) */ + .pvr_mask = 0xfffffff0, + .pvr_value = 0x00082210, + .cpu_name = "750CXe", + .cpu_features = CPU_FTRS_750, + .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_750cx, + .machine_check = machine_check_generic, + .platform = "ppc750", + }, + { /* 750CXe "Gekko" (83214) */ + .pvr_mask = 0xffffffff, + .pvr_value = 0x00083214, + .cpu_name = "750CXe", + .cpu_features = CPU_FTRS_750, + .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_750cx, + .machine_check = machine_check_generic, + .platform = "ppc750", + }, + { /* 750CL (and "Broadway") */ + .pvr_mask = 0xfffff0e0, + .pvr_value = 0x00087000, + .cpu_name = "750CL", + .cpu_features = CPU_FTRS_750CL, + .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE | MMU_FTR_USE_HIGH_BATS, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_750, + .machine_check = machine_check_generic, + .platform = "ppc750", + }, + { /* 745/755 */ + .pvr_mask = 0xfffff000, + .pvr_value = 0x00083000, + .cpu_name = "745/755", + .cpu_features = CPU_FTRS_750, + .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_750, + .machine_check = machine_check_generic, + .platform = "ppc750", + }, + { /* 750FX rev 1.x */ + .pvr_mask = 0xffffff00, + .pvr_value = 0x70000100, + .cpu_name = "750FX", + .cpu_features = CPU_FTRS_750FX1, + .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_750, + .machine_check = machine_check_generic, + .platform = "ppc750", + }, + { /* 750FX rev 2.0 must disable HID0[DPM] */ + .pvr_mask = 0xffffffff, + .pvr_value = 0x70000200, + .cpu_name = "750FX", + .cpu_features = CPU_FTRS_750FX2, + .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_750, + .machine_check = machine_check_generic, + .platform = "ppc750", + }, + { /* 750FX (All revs except 2.0) */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x70000000, + .cpu_name = "750FX", + .cpu_features = CPU_FTRS_750FX, + .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE | MMU_FTR_USE_HIGH_BATS, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_750fx, + .machine_check = machine_check_generic, + .platform = "ppc750", + }, + { /* 750GX */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x70020000, + .cpu_name = "750GX", + .cpu_features = CPU_FTRS_750GX, + .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE | MMU_FTR_USE_HIGH_BATS, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_750fx, + .machine_check = machine_check_generic, + .platform = "ppc750", + }, + { /* 740/750 (L2CR bit need fixup for 740) */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x00080000, + .cpu_name = "740/750", + .cpu_features = CPU_FTRS_740, + .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_750, + .machine_check = machine_check_generic, + .platform = "ppc750", + }, + { /* 7400 rev 1.1 ? (no TAU) */ + .pvr_mask = 0xffffffff, + .pvr_value = 0x000c1101, + .cpu_name = "7400 (1.1)", + .cpu_features = CPU_FTRS_7400_NOTAU, + .cpu_user_features = COMMON_USER | PPC_FEATURE_HAS_ALTIVEC_COMP | + PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .pmc_type = PPC_PMC_G4, + .cpu_setup = __setup_cpu_7400, + .machine_check = machine_check_generic, + .platform = "ppc7400", + }, + { /* 7400 */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x000c0000, + .cpu_name = "7400", + .cpu_features = CPU_FTRS_7400, + .cpu_user_features = COMMON_USER | PPC_FEATURE_HAS_ALTIVEC_COMP | + PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .pmc_type = PPC_PMC_G4, + .cpu_setup = __setup_cpu_7400, + .machine_check = machine_check_generic, + .platform = "ppc7400", + }, + { /* 7410 */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x800c0000, + .cpu_name = "7410", + .cpu_features = CPU_FTRS_7400, + .cpu_user_features = COMMON_USER | PPC_FEATURE_HAS_ALTIVEC_COMP | + PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 4, + .pmc_type = PPC_PMC_G4, + .cpu_setup = __setup_cpu_7410, + .machine_check = machine_check_generic, + .platform = "ppc7400", + }, + { /* 7450 2.0 - no doze/nap */ + .pvr_mask = 0xffffffff, + .pvr_value = 0x80000200, + .cpu_name = "7450", + .cpu_features = CPU_FTRS_7450_20, + .cpu_user_features = COMMON_USER | PPC_FEATURE_HAS_ALTIVEC_COMP | + PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 6, + .pmc_type = PPC_PMC_G4, + .cpu_setup = __setup_cpu_745x, + .machine_check = machine_check_generic, + .platform = "ppc7450", + }, + { /* 7450 2.1 */ + .pvr_mask = 0xffffffff, + .pvr_value = 0x80000201, + .cpu_name = "7450", + .cpu_features = CPU_FTRS_7450_21, + .cpu_user_features = COMMON_USER | PPC_FEATURE_HAS_ALTIVEC_COMP | + PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 6, + .pmc_type = PPC_PMC_G4, + .cpu_setup = __setup_cpu_745x, + .machine_check = machine_check_generic, + .platform = "ppc7450", + }, + { /* 7450 2.3 and newer */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x80000000, + .cpu_name = "7450", + .cpu_features = CPU_FTRS_7450_23, + .cpu_user_features = COMMON_USER | PPC_FEATURE_HAS_ALTIVEC_COMP | + PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 6, + .pmc_type = PPC_PMC_G4, + .cpu_setup = __setup_cpu_745x, + .machine_check = machine_check_generic, + .platform = "ppc7450", + }, + { /* 7455 rev 1.x */ + .pvr_mask = 0xffffff00, + .pvr_value = 0x80010100, + .cpu_name = "7455", + .cpu_features = CPU_FTRS_7455_1, + .cpu_user_features = COMMON_USER | PPC_FEATURE_HAS_ALTIVEC_COMP | + PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE | MMU_FTR_USE_HIGH_BATS, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 6, + .pmc_type = PPC_PMC_G4, + .cpu_setup = __setup_cpu_745x, + .machine_check = machine_check_generic, + .platform = "ppc7450", + }, + { /* 7455 rev 2.0 */ + .pvr_mask = 0xffffffff, + .pvr_value = 0x80010200, + .cpu_name = "7455", + .cpu_features = CPU_FTRS_7455_20, + .cpu_user_features = COMMON_USER | PPC_FEATURE_HAS_ALTIVEC_COMP | + PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE | MMU_FTR_USE_HIGH_BATS, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 6, + .pmc_type = PPC_PMC_G4, + .cpu_setup = __setup_cpu_745x, + .machine_check = machine_check_generic, + .platform = "ppc7450", + }, + { /* 7455 others */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x80010000, + .cpu_name = "7455", + .cpu_features = CPU_FTRS_7455, + .cpu_user_features = COMMON_USER | PPC_FEATURE_HAS_ALTIVEC_COMP | + PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE | MMU_FTR_USE_HIGH_BATS, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 6, + .pmc_type = PPC_PMC_G4, + .cpu_setup = __setup_cpu_745x, + .machine_check = machine_check_generic, + .platform = "ppc7450", + }, + { /* 7447/7457 Rev 1.0 */ + .pvr_mask = 0xffffffff, + .pvr_value = 0x80020100, + .cpu_name = "7447/7457", + .cpu_features = CPU_FTRS_7447_10, + .cpu_user_features = COMMON_USER | PPC_FEATURE_HAS_ALTIVEC_COMP | + PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE | MMU_FTR_USE_HIGH_BATS, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 6, + .pmc_type = PPC_PMC_G4, + .cpu_setup = __setup_cpu_745x, + .machine_check = machine_check_generic, + .platform = "ppc7450", + }, + { /* 7447/7457 Rev 1.1 */ + .pvr_mask = 0xffffffff, + .pvr_value = 0x80020101, + .cpu_name = "7447/7457", + .cpu_features = CPU_FTRS_7447_10, + .cpu_user_features = COMMON_USER | PPC_FEATURE_HAS_ALTIVEC_COMP | + PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE | MMU_FTR_USE_HIGH_BATS, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 6, + .pmc_type = PPC_PMC_G4, + .cpu_setup = __setup_cpu_745x, + .machine_check = machine_check_generic, + .platform = "ppc7450", + }, + { /* 7447/7457 Rev 1.2 and later */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x80020000, + .cpu_name = "7447/7457", + .cpu_features = CPU_FTRS_7447, + .cpu_user_features = COMMON_USER | PPC_FEATURE_HAS_ALTIVEC_COMP | + PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE | MMU_FTR_USE_HIGH_BATS, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 6, + .pmc_type = PPC_PMC_G4, + .cpu_setup = __setup_cpu_745x, + .machine_check = machine_check_generic, + .platform = "ppc7450", + }, + { /* 7447A */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x80030000, + .cpu_name = "7447A", + .cpu_features = CPU_FTRS_7447A, + .cpu_user_features = COMMON_USER | PPC_FEATURE_HAS_ALTIVEC_COMP | + PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE | MMU_FTR_USE_HIGH_BATS, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 6, + .pmc_type = PPC_PMC_G4, + .cpu_setup = __setup_cpu_745x, + .machine_check = machine_check_generic, + .platform = "ppc7450", + }, + { /* 7448 */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x80040000, + .cpu_name = "7448", + .cpu_features = CPU_FTRS_7448, + .cpu_user_features = COMMON_USER | PPC_FEATURE_HAS_ALTIVEC_COMP | + PPC_FEATURE_PPC_LE, + .mmu_features = MMU_FTR_HPTE_TABLE | MMU_FTR_USE_HIGH_BATS, + .icache_bsize = 32, + .dcache_bsize = 32, + .num_pmcs = 6, + .pmc_type = PPC_PMC_G4, + .cpu_setup = __setup_cpu_745x, + .machine_check = machine_check_generic, + .platform = "ppc7450", + }, + { /* default match, we assume split I/D cache & TB (non-601)... */ + .pvr_mask = 0x00000000, + .pvr_value = 0x00000000, + .cpu_name = "(generic PPC)", + .cpu_features = CPU_FTRS_CLASSIC32, + .cpu_user_features = COMMON_USER, + .mmu_features = MMU_FTR_HPTE_TABLE, + .icache_bsize = 32, + .dcache_bsize = 32, + .machine_check = machine_check_generic, + .platform = "ppc603", + }, +#endif /* CONFIG_PPC_BOOK3S_604 */ +}; diff --git a/arch/powerpc/kernel/cpu_specs_book3s_64.h b/arch/powerpc/kernel/cpu_specs_book3s_64.h new file mode 100644 index 000000000..c370c1b80 --- /dev/null +++ b/arch/powerpc/kernel/cpu_specs_book3s_64.h @@ -0,0 +1,481 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org) + * + * Modifications for ppc64: + * Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com> + */ + +/* NOTE: + * Unlike ppc32, ppc64 will only call cpu_setup() for the boot CPU, it's + * the responsibility of the appropriate CPU save/restore functions to + * eventually copy these settings over. Those save/restore aren't yet + * part of the cputable though. That has to be fixed for both ppc32 + * and ppc64 + */ +#define COMMON_USER_PPC64 (PPC_FEATURE_32 | PPC_FEATURE_HAS_FPU | \ + PPC_FEATURE_HAS_MMU | PPC_FEATURE_64) +#define COMMON_USER_POWER4 (COMMON_USER_PPC64 | PPC_FEATURE_POWER4) +#define COMMON_USER_POWER5 (COMMON_USER_PPC64 | PPC_FEATURE_POWER5 |\ + PPC_FEATURE_SMT | PPC_FEATURE_ICACHE_SNOOP) +#define COMMON_USER_POWER5_PLUS (COMMON_USER_PPC64 | PPC_FEATURE_POWER5_PLUS|\ + PPC_FEATURE_SMT | PPC_FEATURE_ICACHE_SNOOP) +#define COMMON_USER_POWER6 (COMMON_USER_PPC64 | PPC_FEATURE_ARCH_2_05 |\ + PPC_FEATURE_SMT | PPC_FEATURE_ICACHE_SNOOP | \ + PPC_FEATURE_TRUE_LE | \ + PPC_FEATURE_PSERIES_PERFMON_COMPAT) +#define COMMON_USER_POWER7 (COMMON_USER_PPC64 | PPC_FEATURE_ARCH_2_06 |\ + PPC_FEATURE_SMT | PPC_FEATURE_ICACHE_SNOOP | \ + PPC_FEATURE_TRUE_LE | \ + PPC_FEATURE_PSERIES_PERFMON_COMPAT) +#define COMMON_USER2_POWER7 (PPC_FEATURE2_DSCR) +#define COMMON_USER_POWER8 (COMMON_USER_PPC64 | PPC_FEATURE_ARCH_2_06 |\ + PPC_FEATURE_SMT | PPC_FEATURE_ICACHE_SNOOP | \ + PPC_FEATURE_TRUE_LE | \ + PPC_FEATURE_PSERIES_PERFMON_COMPAT) +#define COMMON_USER2_POWER8 (PPC_FEATURE2_ARCH_2_07 | \ + PPC_FEATURE2_HTM_COMP | \ + PPC_FEATURE2_HTM_NOSC_COMP | \ + PPC_FEATURE2_DSCR | \ + PPC_FEATURE2_ISEL | PPC_FEATURE2_TAR | \ + PPC_FEATURE2_VEC_CRYPTO) +#define COMMON_USER_PA6T (COMMON_USER_PPC64 | PPC_FEATURE_PA6T |\ + PPC_FEATURE_TRUE_LE | \ + PPC_FEATURE_HAS_ALTIVEC_COMP) +#define COMMON_USER_POWER9 COMMON_USER_POWER8 +#define COMMON_USER2_POWER9 (COMMON_USER2_POWER8 | \ + PPC_FEATURE2_ARCH_3_00 | \ + PPC_FEATURE2_HAS_IEEE128 | \ + PPC_FEATURE2_DARN | \ + PPC_FEATURE2_SCV) +#define COMMON_USER_POWER10 COMMON_USER_POWER9 +#define COMMON_USER2_POWER10 (PPC_FEATURE2_ARCH_3_1 | \ + PPC_FEATURE2_MMA | \ + PPC_FEATURE2_ARCH_3_00 | \ + PPC_FEATURE2_HAS_IEEE128 | \ + PPC_FEATURE2_DARN | \ + PPC_FEATURE2_SCV | \ + PPC_FEATURE2_ARCH_2_07 | \ + PPC_FEATURE2_DSCR | \ + PPC_FEATURE2_ISEL | PPC_FEATURE2_TAR | \ + PPC_FEATURE2_VEC_CRYPTO) + +static struct cpu_spec cpu_specs[] __initdata = { + { /* PPC970 */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x00390000, + .cpu_name = "PPC970", + .cpu_features = CPU_FTRS_PPC970, + .cpu_user_features = COMMON_USER_POWER4 | PPC_FEATURE_HAS_ALTIVEC_COMP, + .mmu_features = MMU_FTRS_PPC970, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 8, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_ppc970, + .cpu_restore = __restore_cpu_ppc970, + .platform = "ppc970", + }, + { /* PPC970FX */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x003c0000, + .cpu_name = "PPC970FX", + .cpu_features = CPU_FTRS_PPC970, + .cpu_user_features = COMMON_USER_POWER4 | PPC_FEATURE_HAS_ALTIVEC_COMP, + .mmu_features = MMU_FTRS_PPC970, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 8, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_ppc970, + .cpu_restore = __restore_cpu_ppc970, + .platform = "ppc970", + }, + { /* PPC970MP DD1.0 - no DEEPNAP, use regular 970 init */ + .pvr_mask = 0xffffffff, + .pvr_value = 0x00440100, + .cpu_name = "PPC970MP", + .cpu_features = CPU_FTRS_PPC970, + .cpu_user_features = COMMON_USER_POWER4 | PPC_FEATURE_HAS_ALTIVEC_COMP, + .mmu_features = MMU_FTRS_PPC970, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 8, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_ppc970, + .cpu_restore = __restore_cpu_ppc970, + .platform = "ppc970", + }, + { /* PPC970MP */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x00440000, + .cpu_name = "PPC970MP", + .cpu_features = CPU_FTRS_PPC970, + .cpu_user_features = COMMON_USER_POWER4 | PPC_FEATURE_HAS_ALTIVEC_COMP, + .mmu_features = MMU_FTRS_PPC970, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 8, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_ppc970MP, + .cpu_restore = __restore_cpu_ppc970, + .platform = "ppc970", + }, + { /* PPC970GX */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x00450000, + .cpu_name = "PPC970GX", + .cpu_features = CPU_FTRS_PPC970, + .cpu_user_features = COMMON_USER_POWER4 | PPC_FEATURE_HAS_ALTIVEC_COMP, + .mmu_features = MMU_FTRS_PPC970, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 8, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_ppc970, + .platform = "ppc970", + }, + { /* Power5 GR */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x003a0000, + .cpu_name = "POWER5 (gr)", + .cpu_features = CPU_FTRS_POWER5, + .cpu_user_features = COMMON_USER_POWER5, + .mmu_features = MMU_FTRS_POWER5, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 6, + .pmc_type = PPC_PMC_IBM, + .platform = "power5", + }, + { /* Power5++ */ + .pvr_mask = 0xffffff00, + .pvr_value = 0x003b0300, + .cpu_name = "POWER5+ (gs)", + .cpu_features = CPU_FTRS_POWER5, + .cpu_user_features = COMMON_USER_POWER5_PLUS, + .mmu_features = MMU_FTRS_POWER5, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 6, + .platform = "power5+", + }, + { /* Power5 GS */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x003b0000, + .cpu_name = "POWER5+ (gs)", + .cpu_features = CPU_FTRS_POWER5, + .cpu_user_features = COMMON_USER_POWER5_PLUS, + .mmu_features = MMU_FTRS_POWER5, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 6, + .pmc_type = PPC_PMC_IBM, + .platform = "power5+", + }, + { /* POWER6 in P5+ mode; 2.04-compliant processor */ + .pvr_mask = 0xffffffff, + .pvr_value = 0x0f000001, + .cpu_name = "POWER5+", + .cpu_features = CPU_FTRS_POWER5, + .cpu_user_features = COMMON_USER_POWER5_PLUS, + .mmu_features = MMU_FTRS_POWER5, + .icache_bsize = 128, + .dcache_bsize = 128, + .platform = "power5+", + }, + { /* Power6 */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x003e0000, + .cpu_name = "POWER6 (raw)", + .cpu_features = CPU_FTRS_POWER6, + .cpu_user_features = COMMON_USER_POWER6 | PPC_FEATURE_POWER6_EXT, + .mmu_features = MMU_FTRS_POWER6, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 6, + .pmc_type = PPC_PMC_IBM, + .platform = "power6x", + }, + { /* 2.05-compliant processor, i.e. Power6 "architected" mode */ + .pvr_mask = 0xffffffff, + .pvr_value = 0x0f000002, + .cpu_name = "POWER6 (architected)", + .cpu_features = CPU_FTRS_POWER6, + .cpu_user_features = COMMON_USER_POWER6, + .mmu_features = MMU_FTRS_POWER6, + .icache_bsize = 128, + .dcache_bsize = 128, + .platform = "power6", + }, + { /* 2.06-compliant processor, i.e. Power7 "architected" mode */ + .pvr_mask = 0xffffffff, + .pvr_value = 0x0f000003, + .cpu_name = "POWER7 (architected)", + .cpu_features = CPU_FTRS_POWER7, + .cpu_user_features = COMMON_USER_POWER7, + .cpu_user_features2 = COMMON_USER2_POWER7, + .mmu_features = MMU_FTRS_POWER7, + .icache_bsize = 128, + .dcache_bsize = 128, + .cpu_setup = __setup_cpu_power7, + .cpu_restore = __restore_cpu_power7, + .machine_check_early = __machine_check_early_realmode_p7, + .platform = "power7", + }, + { /* 2.07-compliant processor, i.e. Power8 "architected" mode */ + .pvr_mask = 0xffffffff, + .pvr_value = 0x0f000004, + .cpu_name = "POWER8 (architected)", + .cpu_features = CPU_FTRS_POWER8, + .cpu_user_features = COMMON_USER_POWER8, + .cpu_user_features2 = COMMON_USER2_POWER8, + .mmu_features = MMU_FTRS_POWER8, + .icache_bsize = 128, + .dcache_bsize = 128, + .cpu_setup = __setup_cpu_power8, + .cpu_restore = __restore_cpu_power8, + .machine_check_early = __machine_check_early_realmode_p8, + .platform = "power8", + }, + { /* 3.00-compliant processor, i.e. Power9 "architected" mode */ + .pvr_mask = 0xffffffff, + .pvr_value = 0x0f000005, + .cpu_name = "POWER9 (architected)", + .cpu_features = CPU_FTRS_POWER9, + .cpu_user_features = COMMON_USER_POWER9, + .cpu_user_features2 = COMMON_USER2_POWER9, + .mmu_features = MMU_FTRS_POWER9, + .icache_bsize = 128, + .dcache_bsize = 128, + .cpu_setup = __setup_cpu_power9, + .cpu_restore = __restore_cpu_power9, + .platform = "power9", + }, + { /* 3.1-compliant processor, i.e. Power10 "architected" mode */ + .pvr_mask = 0xffffffff, + .pvr_value = 0x0f000006, + .cpu_name = "POWER10 (architected)", + .cpu_features = CPU_FTRS_POWER10, + .cpu_user_features = COMMON_USER_POWER10, + .cpu_user_features2 = COMMON_USER2_POWER10, + .mmu_features = MMU_FTRS_POWER10, + .icache_bsize = 128, + .dcache_bsize = 128, + .cpu_setup = __setup_cpu_power10, + .cpu_restore = __restore_cpu_power10, + .platform = "power10", + }, + { /* Power7 */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x003f0000, + .cpu_name = "POWER7 (raw)", + .cpu_features = CPU_FTRS_POWER7, + .cpu_user_features = COMMON_USER_POWER7, + .cpu_user_features2 = COMMON_USER2_POWER7, + .mmu_features = MMU_FTRS_POWER7, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 6, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_power7, + .cpu_restore = __restore_cpu_power7, + .machine_check_early = __machine_check_early_realmode_p7, + .platform = "power7", + }, + { /* Power7+ */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x004A0000, + .cpu_name = "POWER7+ (raw)", + .cpu_features = CPU_FTRS_POWER7, + .cpu_user_features = COMMON_USER_POWER7, + .cpu_user_features2 = COMMON_USER2_POWER7, + .mmu_features = MMU_FTRS_POWER7, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 6, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_power7, + .cpu_restore = __restore_cpu_power7, + .machine_check_early = __machine_check_early_realmode_p7, + .platform = "power7+", + }, + { /* Power8E */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x004b0000, + .cpu_name = "POWER8E (raw)", + .cpu_features = CPU_FTRS_POWER8E, + .cpu_user_features = COMMON_USER_POWER8, + .cpu_user_features2 = COMMON_USER2_POWER8, + .mmu_features = MMU_FTRS_POWER8, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 6, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_power8, + .cpu_restore = __restore_cpu_power8, + .machine_check_early = __machine_check_early_realmode_p8, + .platform = "power8", + }, + { /* Power8NVL */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x004c0000, + .cpu_name = "POWER8NVL (raw)", + .cpu_features = CPU_FTRS_POWER8, + .cpu_user_features = COMMON_USER_POWER8, + .cpu_user_features2 = COMMON_USER2_POWER8, + .mmu_features = MMU_FTRS_POWER8, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 6, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_power8, + .cpu_restore = __restore_cpu_power8, + .machine_check_early = __machine_check_early_realmode_p8, + .platform = "power8", + }, + { /* Power8 */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x004d0000, + .cpu_name = "POWER8 (raw)", + .cpu_features = CPU_FTRS_POWER8, + .cpu_user_features = COMMON_USER_POWER8, + .cpu_user_features2 = COMMON_USER2_POWER8, + .mmu_features = MMU_FTRS_POWER8, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 6, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_power8, + .cpu_restore = __restore_cpu_power8, + .machine_check_early = __machine_check_early_realmode_p8, + .platform = "power8", + }, + { /* Power9 DD2.0 */ + .pvr_mask = 0xffffefff, + .pvr_value = 0x004e0200, + .cpu_name = "POWER9 (raw)", + .cpu_features = CPU_FTRS_POWER9_DD2_0, + .cpu_user_features = COMMON_USER_POWER9, + .cpu_user_features2 = COMMON_USER2_POWER9, + .mmu_features = MMU_FTRS_POWER9, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 6, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_power9, + .cpu_restore = __restore_cpu_power9, + .machine_check_early = __machine_check_early_realmode_p9, + .platform = "power9", + }, + { /* Power9 DD 2.1 */ + .pvr_mask = 0xffffefff, + .pvr_value = 0x004e0201, + .cpu_name = "POWER9 (raw)", + .cpu_features = CPU_FTRS_POWER9_DD2_1, + .cpu_user_features = COMMON_USER_POWER9, + .cpu_user_features2 = COMMON_USER2_POWER9, + .mmu_features = MMU_FTRS_POWER9, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 6, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_power9, + .cpu_restore = __restore_cpu_power9, + .machine_check_early = __machine_check_early_realmode_p9, + .platform = "power9", + }, + { /* Power9 DD2.2 */ + .pvr_mask = 0xffffefff, + .pvr_value = 0x004e0202, + .cpu_name = "POWER9 (raw)", + .cpu_features = CPU_FTRS_POWER9_DD2_2, + .cpu_user_features = COMMON_USER_POWER9, + .cpu_user_features2 = COMMON_USER2_POWER9, + .mmu_features = MMU_FTRS_POWER9, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 6, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_power9, + .cpu_restore = __restore_cpu_power9, + .machine_check_early = __machine_check_early_realmode_p9, + .platform = "power9", + }, + { /* Power9 DD2.3 or later */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x004e0000, + .cpu_name = "POWER9 (raw)", + .cpu_features = CPU_FTRS_POWER9_DD2_3, + .cpu_user_features = COMMON_USER_POWER9, + .cpu_user_features2 = COMMON_USER2_POWER9, + .mmu_features = MMU_FTRS_POWER9, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 6, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_power9, + .cpu_restore = __restore_cpu_power9, + .machine_check_early = __machine_check_early_realmode_p9, + .platform = "power9", + }, + { /* Power10 */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x00800000, + .cpu_name = "POWER10 (raw)", + .cpu_features = CPU_FTRS_POWER10, + .cpu_user_features = COMMON_USER_POWER10, + .cpu_user_features2 = COMMON_USER2_POWER10, + .mmu_features = MMU_FTRS_POWER10, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 6, + .pmc_type = PPC_PMC_IBM, + .cpu_setup = __setup_cpu_power10, + .cpu_restore = __restore_cpu_power10, + .machine_check_early = __machine_check_early_realmode_p10, + .platform = "power10", + }, + { /* Cell Broadband Engine */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x00700000, + .cpu_name = "Cell Broadband Engine", + .cpu_features = CPU_FTRS_CELL, + .cpu_user_features = COMMON_USER_PPC64 | PPC_FEATURE_CELL | + PPC_FEATURE_HAS_ALTIVEC_COMP | PPC_FEATURE_SMT, + .mmu_features = MMU_FTRS_CELL, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 4, + .pmc_type = PPC_PMC_IBM, + .platform = "ppc-cell-be", + }, + { /* PA Semi PA6T */ + .pvr_mask = 0x7fff0000, + .pvr_value = 0x00900000, + .cpu_name = "PA6T", + .cpu_features = CPU_FTRS_PA6T, + .cpu_user_features = COMMON_USER_PA6T, + .mmu_features = MMU_FTRS_PA6T, + .icache_bsize = 64, + .dcache_bsize = 64, + .num_pmcs = 6, + .pmc_type = PPC_PMC_PA6T, + .cpu_setup = __setup_cpu_pa6t, + .cpu_restore = __restore_cpu_pa6t, + .platform = "pa6t", + }, + { /* default match */ + .pvr_mask = 0x00000000, + .pvr_value = 0x00000000, + .cpu_name = "POWER5 (compatible)", + .cpu_features = CPU_FTRS_COMPATIBLE, + .cpu_user_features = COMMON_USER_PPC64, + .mmu_features = MMU_FTRS_POWER, + .icache_bsize = 128, + .dcache_bsize = 128, + .num_pmcs = 6, + .pmc_type = PPC_PMC_IBM, + .platform = "power5", + } +}; diff --git a/arch/powerpc/kernel/cpu_specs_e500mc.h b/arch/powerpc/kernel/cpu_specs_e500mc.h new file mode 100644 index 000000000..ceb06b109 --- /dev/null +++ b/arch/powerpc/kernel/cpu_specs_e500mc.h @@ -0,0 +1,75 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org) + * + * Modifications for ppc64: + * Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com> + */ + +#ifdef CONFIG_PPC64 +#define COMMON_USER_BOOKE (PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | \ + PPC_FEATURE_HAS_FPU | PPC_FEATURE_64) +#else +#define COMMON_USER_BOOKE (PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | \ + PPC_FEATURE_BOOKE) +#endif + +static struct cpu_spec cpu_specs[] __initdata = { +#ifdef CONFIG_PPC32 + { /* e500mc */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x80230000, + .cpu_name = "e500mc", + .cpu_features = CPU_FTRS_E500MC, + .cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU, + .cpu_user_features2 = PPC_FEATURE2_ISEL, + .mmu_features = MMU_FTR_TYPE_FSL_E | MMU_FTR_BIG_PHYS | MMU_FTR_USE_TLBILX, + .icache_bsize = 64, + .dcache_bsize = 64, + .num_pmcs = 4, + .cpu_setup = __setup_cpu_e500mc, + .machine_check = machine_check_e500mc, + .platform = "ppce500mc", + .cpu_down_flush = cpu_down_flush_e500mc, + }, +#endif /* CONFIG_PPC32 */ + { /* e5500 */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x80240000, + .cpu_name = "e5500", + .cpu_features = CPU_FTRS_E5500, + .cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU, + .cpu_user_features2 = PPC_FEATURE2_ISEL, + .mmu_features = MMU_FTR_TYPE_FSL_E | MMU_FTR_BIG_PHYS | MMU_FTR_USE_TLBILX, + .icache_bsize = 64, + .dcache_bsize = 64, + .num_pmcs = 4, + .cpu_setup = __setup_cpu_e5500, +#ifndef CONFIG_PPC32 + .cpu_restore = __restore_cpu_e5500, +#endif + .machine_check = machine_check_e500mc, + .platform = "ppce5500", + .cpu_down_flush = cpu_down_flush_e5500, + }, + { /* e6500 */ + .pvr_mask = 0xffff0000, + .pvr_value = 0x80400000, + .cpu_name = "e6500", + .cpu_features = CPU_FTRS_E6500, + .cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU | + PPC_FEATURE_HAS_ALTIVEC_COMP, + .cpu_user_features2 = PPC_FEATURE2_ISEL, + .mmu_features = MMU_FTR_TYPE_FSL_E | MMU_FTR_BIG_PHYS | MMU_FTR_USE_TLBILX, + .icache_bsize = 64, + .dcache_bsize = 64, + .num_pmcs = 6, + .cpu_setup = __setup_cpu_e6500, +#ifndef CONFIG_PPC32 + .cpu_restore = __restore_cpu_e6500, +#endif + .machine_check = machine_check_e500mc, + .platform = "ppce6500", + .cpu_down_flush = cpu_down_flush_e6500, + }, +}; diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c new file mode 100644 index 000000000..8a32bffef --- /dev/null +++ b/arch/powerpc/kernel/cputable.c @@ -0,0 +1,178 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org) + * + * Modifications for ppc64: + * Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com> + */ + +#include <linux/string.h> +#include <linux/sched.h> +#include <linux/threads.h> +#include <linux/init.h> +#include <linux/export.h> +#include <linux/jump_label.h> +#include <linux/of.h> + +#include <asm/cputable.h> +#include <asm/mce.h> +#include <asm/mmu.h> +#include <asm/setup.h> +#include <asm/cpu_setup.h> + +static struct cpu_spec the_cpu_spec __read_mostly; + +struct cpu_spec* cur_cpu_spec __read_mostly = NULL; +EXPORT_SYMBOL(cur_cpu_spec); + +/* The platform string corresponding to the real PVR */ +const char *powerpc_base_platform; + +#include "cpu_specs.h" + +void __init set_cur_cpu_spec(struct cpu_spec *s) +{ + struct cpu_spec *t = &the_cpu_spec; + + t = PTRRELOC(t); + /* + * use memcpy() instead of *t = *s so that GCC replaces it + * by __memcpy() when KASAN is active + */ + memcpy(t, s, sizeof(*t)); + + *PTRRELOC(&cur_cpu_spec) = &the_cpu_spec; +} + +static struct cpu_spec * __init setup_cpu_spec(unsigned long offset, + struct cpu_spec *s) +{ + struct cpu_spec *t = &the_cpu_spec; + struct cpu_spec old; + + t = PTRRELOC(t); + old = *t; + + /* + * Copy everything, then do fixups. Use memcpy() instead of *t = *s + * so that GCC replaces it by __memcpy() when KASAN is active + */ + memcpy(t, s, sizeof(*t)); + + /* + * If we are overriding a previous value derived from the real + * PVR with a new value obtained using a logical PVR value, + * don't modify the performance monitor fields. + */ + if (old.num_pmcs && !s->num_pmcs) { + t->num_pmcs = old.num_pmcs; + t->pmc_type = old.pmc_type; + + /* + * Let's ensure that the + * fix for the PMAO bug is enabled on compatibility mode. + */ + t->cpu_features |= old.cpu_features & CPU_FTR_PMAO_BUG; + } + + *PTRRELOC(&cur_cpu_spec) = &the_cpu_spec; + + /* + * Set the base platform string once; assumes + * we're called with real pvr first. + */ + if (*PTRRELOC(&powerpc_base_platform) == NULL) + *PTRRELOC(&powerpc_base_platform) = t->platform; + +#if defined(CONFIG_PPC64) || defined(CONFIG_BOOKE) + /* ppc64 and booke expect identify_cpu to also call setup_cpu for + * that processor. I will consolidate that at a later time, for now, + * just use #ifdef. We also don't need to PTRRELOC the function + * pointer on ppc64 and booke as we are running at 0 in real mode + * on ppc64 and reloc_offset is always 0 on booke. + */ + if (t->cpu_setup) { + t->cpu_setup(offset, t); + } +#endif /* CONFIG_PPC64 || CONFIG_BOOKE */ + + return t; +} + +struct cpu_spec * __init identify_cpu(unsigned long offset, unsigned int pvr) +{ + struct cpu_spec *s = cpu_specs; + int i; + + BUILD_BUG_ON(!ARRAY_SIZE(cpu_specs)); + + s = PTRRELOC(s); + + for (i = 0; i < ARRAY_SIZE(cpu_specs); i++,s++) { + if ((pvr & s->pvr_mask) == s->pvr_value) + return setup_cpu_spec(offset, s); + } + + BUG(); + + return NULL; +} + +/* + * Used by cpufeatures to get the name for CPUs with a PVR table. + * If they don't hae a PVR table, cpufeatures gets the name from + * cpu device-tree node. + */ +void __init identify_cpu_name(unsigned int pvr) +{ + struct cpu_spec *s = cpu_specs; + struct cpu_spec *t = &the_cpu_spec; + int i; + + s = PTRRELOC(s); + t = PTRRELOC(t); + + for (i = 0; i < ARRAY_SIZE(cpu_specs); i++,s++) { + if ((pvr & s->pvr_mask) == s->pvr_value) { + t->cpu_name = s->cpu_name; + return; + } + } +} + + +#ifdef CONFIG_JUMP_LABEL_FEATURE_CHECKS +struct static_key_true cpu_feature_keys[NUM_CPU_FTR_KEYS] = { + [0 ... NUM_CPU_FTR_KEYS - 1] = STATIC_KEY_TRUE_INIT +}; +EXPORT_SYMBOL_GPL(cpu_feature_keys); + +void __init cpu_feature_keys_init(void) +{ + int i; + + for (i = 0; i < NUM_CPU_FTR_KEYS; i++) { + unsigned long f = 1ul << i; + + if (!(cur_cpu_spec->cpu_features & f)) + static_branch_disable(&cpu_feature_keys[i]); + } +} + +struct static_key_true mmu_feature_keys[NUM_MMU_FTR_KEYS] = { + [0 ... NUM_MMU_FTR_KEYS - 1] = STATIC_KEY_TRUE_INIT +}; +EXPORT_SYMBOL(mmu_feature_keys); + +void __init mmu_feature_keys_init(void) +{ + int i; + + for (i = 0; i < NUM_MMU_FTR_KEYS; i++) { + unsigned long f = 1ul << i; + + if (!(cur_cpu_spec->mmu_features & f)) + static_branch_disable(&mmu_feature_keys[i]); + } +} +#endif diff --git a/arch/powerpc/kernel/crash_dump.c b/arch/powerpc/kernel/crash_dump.c new file mode 100644 index 000000000..9a3b85bfc --- /dev/null +++ b/arch/powerpc/kernel/crash_dump.c @@ -0,0 +1,122 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Routines for doing kexec-based kdump. + * + * Copyright (C) 2005, IBM Corp. + * + * Created by: Michael Ellerman + */ + +#undef DEBUG + +#include <linux/crash_dump.h> +#include <linux/io.h> +#include <linux/memblock.h> +#include <linux/of.h> +#include <asm/code-patching.h> +#include <asm/kdump.h> +#include <asm/firmware.h> +#include <linux/uio.h> +#include <asm/rtas.h> +#include <asm/inst.h> + +#ifdef DEBUG +#include <asm/udbg.h> +#define DBG(fmt...) udbg_printf(fmt) +#else +#define DBG(fmt...) +#endif + +#ifndef CONFIG_NONSTATIC_KERNEL +void __init reserve_kdump_trampoline(void) +{ + memblock_reserve(0, KDUMP_RESERVE_LIMIT); +} + +static void __init create_trampoline(unsigned long addr) +{ + u32 *p = (u32 *)addr; + + /* The maximum range of a single instruction branch, is the current + * instruction's address + (32 MB - 4) bytes. For the trampoline we + * need to branch to current address + 32 MB. So we insert a nop at + * the trampoline address, then the next instruction (+ 4 bytes) + * does a branch to (32 MB - 4). The net effect is that when we + * branch to "addr" we jump to ("addr" + 32 MB). Although it requires + * two instructions it doesn't require any registers. + */ + patch_instruction(p, ppc_inst(PPC_RAW_NOP())); + patch_branch(p + 1, addr + PHYSICAL_START, 0); +} + +void __init setup_kdump_trampoline(void) +{ + unsigned long i; + + DBG(" -> setup_kdump_trampoline()\n"); + + for (i = KDUMP_TRAMPOLINE_START; i < KDUMP_TRAMPOLINE_END; i += 8) { + create_trampoline(i); + } + +#ifdef CONFIG_PPC_PSERIES + create_trampoline(__pa(system_reset_fwnmi) - PHYSICAL_START); + create_trampoline(__pa(machine_check_fwnmi) - PHYSICAL_START); +#endif /* CONFIG_PPC_PSERIES */ + + DBG(" <- setup_kdump_trampoline()\n"); +} +#endif /* CONFIG_NONSTATIC_KERNEL */ + +ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn, + size_t csize, unsigned long offset) +{ + void *vaddr; + phys_addr_t paddr; + + if (!csize) + return 0; + + csize = min_t(size_t, csize, PAGE_SIZE); + paddr = pfn << PAGE_SHIFT; + + if (memblock_is_region_memory(paddr, csize)) { + vaddr = __va(paddr); + csize = copy_to_iter(vaddr + offset, csize, iter); + } else { + vaddr = ioremap_cache(paddr, PAGE_SIZE); + csize = copy_to_iter(vaddr + offset, csize, iter); + iounmap(vaddr); + } + + return csize; +} + +#ifdef CONFIG_PPC_RTAS +/* + * The crashkernel region will almost always overlap the RTAS region, so + * we have to be careful when shrinking the crashkernel region. + */ +void crash_free_reserved_phys_range(unsigned long begin, unsigned long end) +{ + unsigned long addr; + const __be32 *basep, *sizep; + unsigned int rtas_start = 0, rtas_end = 0; + + basep = of_get_property(rtas.dev, "linux,rtas-base", NULL); + sizep = of_get_property(rtas.dev, "rtas-size", NULL); + + if (basep && sizep) { + rtas_start = be32_to_cpup(basep); + rtas_end = rtas_start + be32_to_cpup(sizep); + } + + for (addr = begin; addr < end; addr += PAGE_SIZE) { + /* Does this page overlap with the RTAS region? */ + if (addr <= rtas_end && ((addr + PAGE_SIZE) > rtas_start)) + continue; + + free_reserved_page(pfn_to_page(addr >> PAGE_SHIFT)); + } +} +#endif diff --git a/arch/powerpc/kernel/dawr.c b/arch/powerpc/kernel/dawr.c new file mode 100644 index 000000000..909a05cd2 --- /dev/null +++ b/arch/powerpc/kernel/dawr.c @@ -0,0 +1,110 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * DAWR infrastructure + * + * Copyright 2019, Michael Neuling, IBM Corporation. + */ + +#include <linux/types.h> +#include <linux/export.h> +#include <linux/fs.h> +#include <linux/debugfs.h> +#include <asm/machdep.h> +#include <asm/hvcall.h> +#include <asm/firmware.h> + +bool dawr_force_enable; +EXPORT_SYMBOL_GPL(dawr_force_enable); + +int set_dawr(int nr, struct arch_hw_breakpoint *brk) +{ + unsigned long dawr, dawrx, mrd; + + dawr = brk->address; + + dawrx = (brk->type & (HW_BRK_TYPE_READ | HW_BRK_TYPE_WRITE)) + << (63 - 58); + dawrx |= ((brk->type & (HW_BRK_TYPE_TRANSLATE)) >> 2) << (63 - 59); + dawrx |= (brk->type & (HW_BRK_TYPE_PRIV_ALL)) >> 3; + /* + * DAWR length is stored in field MDR bits 48:53. Matches range in + * doublewords (64 bits) biased by -1 eg. 0b000000=1DW and + * 0b111111=64DW. + * brk->hw_len is in bytes. + * This aligns up to double word size, shifts and does the bias. + */ + mrd = ((brk->hw_len + 7) >> 3) - 1; + dawrx |= (mrd & 0x3f) << (63 - 53); + + if (ppc_md.set_dawr) + return ppc_md.set_dawr(nr, dawr, dawrx); + + if (nr == 0) { + mtspr(SPRN_DAWR0, dawr); + mtspr(SPRN_DAWRX0, dawrx); + } else { + mtspr(SPRN_DAWR1, dawr); + mtspr(SPRN_DAWRX1, dawrx); + } + + return 0; +} + +static void disable_dawrs_cb(void *info) +{ + struct arch_hw_breakpoint null_brk = {0}; + int i; + + for (i = 0; i < nr_wp_slots(); i++) + set_dawr(i, &null_brk); +} + +static ssize_t dawr_write_file_bool(struct file *file, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct arch_hw_breakpoint null_brk = {0}; + size_t rc; + + /* Send error to user if they hypervisor won't allow us to write DAWR */ + if (!dawr_force_enable && + firmware_has_feature(FW_FEATURE_LPAR) && + set_dawr(0, &null_brk) != H_SUCCESS) + return -ENODEV; + + rc = debugfs_write_file_bool(file, user_buf, count, ppos); + if (rc) + return rc; + + /* If we are clearing, make sure all CPUs have the DAWR cleared */ + if (!dawr_force_enable) + smp_call_function(disable_dawrs_cb, NULL, 0); + + return rc; +} + +static const struct file_operations dawr_enable_fops = { + .read = debugfs_read_file_bool, + .write = dawr_write_file_bool, + .open = simple_open, + .llseek = default_llseek, +}; + +static int __init dawr_force_setup(void) +{ + if (cpu_has_feature(CPU_FTR_DAWR)) { + /* Don't setup sysfs file for user control on P8 */ + dawr_force_enable = true; + return 0; + } + + if (PVR_VER(mfspr(SPRN_PVR)) == PVR_POWER9) { + /* Turn DAWR off by default, but allow admin to turn it on */ + debugfs_create_file_unsafe("dawr_enable_dangerous", 0600, + arch_debugfs_dir, + &dawr_force_enable, + &dawr_enable_fops); + } + return 0; +} +arch_initcall(dawr_force_setup); diff --git a/arch/powerpc/kernel/dbell.c b/arch/powerpc/kernel/dbell.c new file mode 100644 index 000000000..5712dd846 --- /dev/null +++ b/arch/powerpc/kernel/dbell.c @@ -0,0 +1,47 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Author: Kumar Gala <galak@kernel.crashing.org> + * + * Copyright 2009 Freescale Semiconductor Inc. + */ + +#include <linux/stddef.h> +#include <linux/kernel.h> +#include <linux/smp.h> +#include <linux/threads.h> +#include <linux/hardirq.h> + +#include <asm/dbell.h> +#include <asm/interrupt.h> +#include <asm/irq_regs.h> +#include <asm/kvm_ppc.h> +#include <asm/trace.h> + +#ifdef CONFIG_SMP + +DEFINE_INTERRUPT_HANDLER_ASYNC(doorbell_exception) +{ + struct pt_regs *old_regs = set_irq_regs(regs); + + trace_doorbell_entry(regs); + + ppc_msgsync(); + + if (should_hard_irq_enable(regs)) + do_hard_irq_enable(); + + kvmppc_clear_host_ipi(smp_processor_id()); + __this_cpu_inc(irq_stat.doorbell_irqs); + + smp_ipi_demux_relaxed(); /* already performed the barrier */ + + trace_doorbell_exit(regs); + + set_irq_regs(old_regs); +} +#else /* CONFIG_SMP */ +DEFINE_INTERRUPT_HANDLER_ASYNC(doorbell_exception) +{ + printk(KERN_WARNING "Received doorbell on non-smp system\n"); +} +#endif /* CONFIG_SMP */ diff --git a/arch/powerpc/kernel/dma-iommu.c b/arch/powerpc/kernel/dma-iommu.c new file mode 100644 index 000000000..8920862ff --- /dev/null +++ b/arch/powerpc/kernel/dma-iommu.c @@ -0,0 +1,221 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation + * + * Provide default implementations of the DMA mapping callbacks for + * busses using the iommu infrastructure + */ + +#include <linux/dma-direct.h> +#include <linux/pci.h> +#include <asm/iommu.h> + +#ifdef CONFIG_ARCH_HAS_DMA_MAP_DIRECT +#define can_map_direct(dev, addr) \ + ((dev)->bus_dma_limit >= phys_to_dma((dev), (addr))) + +bool arch_dma_map_page_direct(struct device *dev, phys_addr_t addr) +{ + if (likely(!dev->bus_dma_limit)) + return false; + + return can_map_direct(dev, addr); +} + +#define is_direct_handle(dev, h) ((h) >= (dev)->archdata.dma_offset) + +bool arch_dma_unmap_page_direct(struct device *dev, dma_addr_t dma_handle) +{ + if (likely(!dev->bus_dma_limit)) + return false; + + return is_direct_handle(dev, dma_handle); +} + +bool arch_dma_map_sg_direct(struct device *dev, struct scatterlist *sg, + int nents) +{ + struct scatterlist *s; + int i; + + if (likely(!dev->bus_dma_limit)) + return false; + + for_each_sg(sg, s, nents, i) { + if (!can_map_direct(dev, sg_phys(s) + s->offset + s->length)) + return false; + } + + return true; +} + +bool arch_dma_unmap_sg_direct(struct device *dev, struct scatterlist *sg, + int nents) +{ + struct scatterlist *s; + int i; + + if (likely(!dev->bus_dma_limit)) + return false; + + for_each_sg(sg, s, nents, i) { + if (!is_direct_handle(dev, s->dma_address + s->length)) + return false; + } + + return true; +} +#endif /* CONFIG_ARCH_HAS_DMA_MAP_DIRECT */ + +/* + * Generic iommu implementation + */ + +/* Allocates a contiguous real buffer and creates mappings over it. + * Returns the virtual address of the buffer and sets dma_handle + * to the dma address (mapping) of the first page. + */ +static void *dma_iommu_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t flag, + unsigned long attrs) +{ + return iommu_alloc_coherent(dev, get_iommu_table_base(dev), size, + dma_handle, dev->coherent_dma_mask, flag, + dev_to_node(dev)); +} + +static void dma_iommu_free_coherent(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_handle, + unsigned long attrs) +{ + iommu_free_coherent(get_iommu_table_base(dev), size, vaddr, dma_handle); +} + +/* Creates TCEs for a user provided buffer. The user buffer must be + * contiguous real kernel storage (not vmalloc). The address passed here + * comprises a page address and offset into that page. The dma_addr_t + * returned will point to the same byte within the page as was passed in. + */ +static dma_addr_t dma_iommu_map_page(struct device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction direction, + unsigned long attrs) +{ + return iommu_map_page(dev, get_iommu_table_base(dev), page, offset, + size, dma_get_mask(dev), direction, attrs); +} + + +static void dma_iommu_unmap_page(struct device *dev, dma_addr_t dma_handle, + size_t size, enum dma_data_direction direction, + unsigned long attrs) +{ + iommu_unmap_page(get_iommu_table_base(dev), dma_handle, size, direction, + attrs); +} + + +static int dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist, + int nelems, enum dma_data_direction direction, + unsigned long attrs) +{ + return ppc_iommu_map_sg(dev, get_iommu_table_base(dev), sglist, nelems, + dma_get_mask(dev), direction, attrs); +} + +static void dma_iommu_unmap_sg(struct device *dev, struct scatterlist *sglist, + int nelems, enum dma_data_direction direction, + unsigned long attrs) +{ + ppc_iommu_unmap_sg(get_iommu_table_base(dev), sglist, nelems, + direction, attrs); +} + +static bool dma_iommu_bypass_supported(struct device *dev, u64 mask) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct pci_controller *phb = pci_bus_to_host(pdev->bus); + + if (iommu_fixed_is_weak || !phb->controller_ops.iommu_bypass_supported) + return false; + return phb->controller_ops.iommu_bypass_supported(pdev, mask); +} + +/* We support DMA to/from any memory page via the iommu */ +int dma_iommu_dma_supported(struct device *dev, u64 mask) +{ + struct iommu_table *tbl; + + if (dev_is_pci(dev) && dma_iommu_bypass_supported(dev, mask)) { + /* + * dma_iommu_bypass_supported() sets dma_max when there is + * 1:1 mapping but it is somehow limited. + * ibm,pmemory is one example. + */ + dev->dma_ops_bypass = dev->bus_dma_limit == 0; + if (!dev->dma_ops_bypass) + dev_warn(dev, + "iommu: 64-bit OK but direct DMA is limited by %llx\n", + dev->bus_dma_limit); + else + dev_dbg(dev, "iommu: 64-bit OK, using fixed ops\n"); + return 1; + } + + tbl = get_iommu_table_base(dev); + + if (!tbl) { + dev_err(dev, "Warning: IOMMU dma not supported: mask 0x%08llx, table unavailable\n", mask); + return 0; + } + + if (tbl->it_offset > (mask >> tbl->it_page_shift)) { + dev_info(dev, "Warning: IOMMU offset too big for device mask\n"); + dev_info(dev, "mask: 0x%08llx, table offset: 0x%08lx\n", + mask, tbl->it_offset << tbl->it_page_shift); + return 0; + } + + dev_dbg(dev, "iommu: not 64-bit, using default ops\n"); + dev->dma_ops_bypass = false; + return 1; +} + +u64 dma_iommu_get_required_mask(struct device *dev) +{ + struct iommu_table *tbl = get_iommu_table_base(dev); + u64 mask; + + if (dev_is_pci(dev)) { + u64 bypass_mask = dma_direct_get_required_mask(dev); + + if (dma_iommu_dma_supported(dev, bypass_mask)) { + dev_info(dev, "%s: returning bypass mask 0x%llx\n", __func__, bypass_mask); + return bypass_mask; + } + } + + if (!tbl) + return 0; + + mask = 1ULL << (fls_long(tbl->it_offset + tbl->it_size) + + tbl->it_page_shift - 1); + mask += mask - 1; + + return mask; +} + +const struct dma_map_ops dma_iommu_ops = { + .alloc = dma_iommu_alloc_coherent, + .free = dma_iommu_free_coherent, + .map_sg = dma_iommu_map_sg, + .unmap_sg = dma_iommu_unmap_sg, + .dma_supported = dma_iommu_dma_supported, + .map_page = dma_iommu_map_page, + .unmap_page = dma_iommu_unmap_page, + .get_required_mask = dma_iommu_get_required_mask, + .mmap = dma_common_mmap, + .get_sgtable = dma_common_get_sgtable, + .alloc_pages = dma_common_alloc_pages, + .free_pages = dma_common_free_pages, +}; diff --git a/arch/powerpc/kernel/dma-mask.c b/arch/powerpc/kernel/dma-mask.c new file mode 100644 index 000000000..ffbbbc432 --- /dev/null +++ b/arch/powerpc/kernel/dma-mask.c @@ -0,0 +1,12 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/dma-mapping.h> +#include <linux/export.h> +#include <asm/machdep.h> + +void arch_dma_set_mask(struct device *dev, u64 dma_mask) +{ + if (ppc_md.dma_set_mask) + ppc_md.dma_set_mask(dev, dma_mask); +} +EXPORT_SYMBOL(arch_dma_set_mask); diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c new file mode 100644 index 000000000..ba256c37b --- /dev/null +++ b/arch/powerpc/kernel/dma-swiotlb.c @@ -0,0 +1,30 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Contains routines needed to support swiotlb for ppc. + * + * Copyright (C) 2009-2010 Freescale Semiconductor, Inc. + * Author: Becky Bruce + */ +#include <linux/memblock.h> +#include <asm/machdep.h> +#include <asm/swiotlb.h> + +unsigned int ppc_swiotlb_enable; +unsigned int ppc_swiotlb_flags; + +void __init swiotlb_detect_4g(void) +{ + if ((memblock_end_of_DRAM() - 1) > 0xffffffff) + ppc_swiotlb_enable = 1; +} + +static int __init check_swiotlb_enabled(void) +{ + if (ppc_swiotlb_enable) + swiotlb_print_info(); + else + swiotlb_exit(); + + return 0; +} +subsys_initcall(check_swiotlb_enabled); diff --git a/arch/powerpc/kernel/dt_cpu_ftrs.c b/arch/powerpc/kernel/dt_cpu_ftrs.c new file mode 100644 index 000000000..c3fb9fdf5 --- /dev/null +++ b/arch/powerpc/kernel/dt_cpu_ftrs.c @@ -0,0 +1,1120 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2017, Nicholas Piggin, IBM Corporation + */ + +#define pr_fmt(fmt) "dt-cpu-ftrs: " fmt + +#include <linux/export.h> +#include <linux/init.h> +#include <linux/jump_label.h> +#include <linux/libfdt.h> +#include <linux/memblock.h> +#include <linux/of_fdt.h> +#include <linux/printk.h> +#include <linux/sched.h> +#include <linux/string.h> +#include <linux/threads.h> + +#include <asm/cputable.h> +#include <asm/dt_cpu_ftrs.h> +#include <asm/mce.h> +#include <asm/mmu.h> +#include <asm/setup.h> + + +/* Device-tree visible constants follow */ +#define ISA_V3_0B 3000 +#define ISA_V3_1 3100 + +#define USABLE_PR (1U << 0) +#define USABLE_OS (1U << 1) +#define USABLE_HV (1U << 2) + +#define HV_SUPPORT_HFSCR (1U << 0) +#define OS_SUPPORT_FSCR (1U << 0) + +/* For parsing, we define all bits set as "NONE" case */ +#define HV_SUPPORT_NONE 0xffffffffU +#define OS_SUPPORT_NONE 0xffffffffU + +struct dt_cpu_feature { + const char *name; + uint32_t isa; + uint32_t usable_privilege; + uint32_t hv_support; + uint32_t os_support; + uint32_t hfscr_bit_nr; + uint32_t fscr_bit_nr; + uint32_t hwcap_bit_nr; + /* fdt parsing */ + unsigned long node; + int enabled; + int disabled; +}; + +#define MMU_FTRS_HASH_BASE (MMU_FTRS_POWER8) + +#define COMMON_USER_BASE (PPC_FEATURE_32 | PPC_FEATURE_64 | \ + PPC_FEATURE_ARCH_2_06 |\ + PPC_FEATURE_ICACHE_SNOOP) +#define COMMON_USER2_BASE (PPC_FEATURE2_ARCH_2_07 | \ + PPC_FEATURE2_ISEL) +/* + * Set up the base CPU + */ + +static int hv_mode; + +static struct { + u64 lpcr; + u64 hfscr; + u64 fscr; + u64 pcr; +} system_registers; + +static void (*init_pmu_registers)(void); + +static void __restore_cpu_cpufeatures(void) +{ + mtspr(SPRN_LPCR, system_registers.lpcr); + if (hv_mode) { + mtspr(SPRN_LPID, 0); + mtspr(SPRN_AMOR, ~0); + mtspr(SPRN_HFSCR, system_registers.hfscr); + mtspr(SPRN_PCR, system_registers.pcr); + } + mtspr(SPRN_FSCR, system_registers.fscr); + + if (init_pmu_registers) + init_pmu_registers(); +} + +static char dt_cpu_name[64]; + +static struct cpu_spec __initdata base_cpu_spec = { + .cpu_name = NULL, + .cpu_features = CPU_FTRS_DT_CPU_BASE, + .cpu_user_features = COMMON_USER_BASE, + .cpu_user_features2 = COMMON_USER2_BASE, + .mmu_features = 0, + .icache_bsize = 32, /* minimum block size, fixed by */ + .dcache_bsize = 32, /* cache info init. */ + .num_pmcs = 0, + .pmc_type = PPC_PMC_DEFAULT, + .cpu_setup = NULL, + .cpu_restore = __restore_cpu_cpufeatures, + .machine_check_early = NULL, + .platform = NULL, +}; + +static void __init cpufeatures_setup_cpu(void) +{ + set_cur_cpu_spec(&base_cpu_spec); + + cur_cpu_spec->pvr_mask = -1; + cur_cpu_spec->pvr_value = mfspr(SPRN_PVR); + + /* Initialize the base environment -- clear FSCR/HFSCR. */ + hv_mode = !!(mfmsr() & MSR_HV); + if (hv_mode) { + cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE; + mtspr(SPRN_HFSCR, 0); + } + mtspr(SPRN_FSCR, 0); + mtspr(SPRN_PCR, PCR_MASK); + + /* + * LPCR does not get cleared, to match behaviour with secondaries + * in __restore_cpu_cpufeatures. Once the idle code is fixed, this + * could clear LPCR too. + */ +} + +static int __init feat_try_enable_unknown(struct dt_cpu_feature *f) +{ + if (f->hv_support == HV_SUPPORT_NONE) { + } else if (f->hv_support & HV_SUPPORT_HFSCR) { + u64 hfscr = mfspr(SPRN_HFSCR); + hfscr |= 1UL << f->hfscr_bit_nr; + mtspr(SPRN_HFSCR, hfscr); + } else { + /* Does not have a known recipe */ + return 0; + } + + if (f->os_support == OS_SUPPORT_NONE) { + } else if (f->os_support & OS_SUPPORT_FSCR) { + u64 fscr = mfspr(SPRN_FSCR); + fscr |= 1UL << f->fscr_bit_nr; + mtspr(SPRN_FSCR, fscr); + } else { + /* Does not have a known recipe */ + return 0; + } + + if ((f->usable_privilege & USABLE_PR) && (f->hwcap_bit_nr != -1)) { + uint32_t word = f->hwcap_bit_nr / 32; + uint32_t bit = f->hwcap_bit_nr % 32; + + if (word == 0) + cur_cpu_spec->cpu_user_features |= 1U << bit; + else if (word == 1) + cur_cpu_spec->cpu_user_features2 |= 1U << bit; + else + pr_err("%s could not advertise to user (no hwcap bits)\n", f->name); + } + + return 1; +} + +static int __init feat_enable(struct dt_cpu_feature *f) +{ + if (f->hv_support != HV_SUPPORT_NONE) { + if (f->hfscr_bit_nr != -1) { + u64 hfscr = mfspr(SPRN_HFSCR); + hfscr |= 1UL << f->hfscr_bit_nr; + mtspr(SPRN_HFSCR, hfscr); + } + } + + if (f->os_support != OS_SUPPORT_NONE) { + if (f->fscr_bit_nr != -1) { + u64 fscr = mfspr(SPRN_FSCR); + fscr |= 1UL << f->fscr_bit_nr; + mtspr(SPRN_FSCR, fscr); + } + } + + if ((f->usable_privilege & USABLE_PR) && (f->hwcap_bit_nr != -1)) { + uint32_t word = f->hwcap_bit_nr / 32; + uint32_t bit = f->hwcap_bit_nr % 32; + + if (word == 0) + cur_cpu_spec->cpu_user_features |= 1U << bit; + else if (word == 1) + cur_cpu_spec->cpu_user_features2 |= 1U << bit; + else + pr_err("CPU feature: %s could not advertise to user (no hwcap bits)\n", f->name); + } + + return 1; +} + +static int __init feat_disable(struct dt_cpu_feature *f) +{ + return 0; +} + +static int __init feat_enable_hv(struct dt_cpu_feature *f) +{ + u64 lpcr; + + if (!hv_mode) { + pr_err("CPU feature hypervisor present in device tree but HV mode not enabled in the CPU. Ignoring.\n"); + return 0; + } + + mtspr(SPRN_LPID, 0); + mtspr(SPRN_AMOR, ~0); + + lpcr = mfspr(SPRN_LPCR); + lpcr &= ~LPCR_LPES0; /* HV external interrupts */ + mtspr(SPRN_LPCR, lpcr); + + cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE; + + return 1; +} + +static int __init feat_enable_le(struct dt_cpu_feature *f) +{ + cur_cpu_spec->cpu_user_features |= PPC_FEATURE_TRUE_LE; + return 1; +} + +static int __init feat_enable_smt(struct dt_cpu_feature *f) +{ + cur_cpu_spec->cpu_features |= CPU_FTR_SMT; + cur_cpu_spec->cpu_user_features |= PPC_FEATURE_SMT; + return 1; +} + +static int __init feat_enable_idle_nap(struct dt_cpu_feature *f) +{ + u64 lpcr; + + /* Set PECE wakeup modes for ISA 207 */ + lpcr = mfspr(SPRN_LPCR); + lpcr |= LPCR_PECE0; + lpcr |= LPCR_PECE1; + lpcr |= LPCR_PECE2; + mtspr(SPRN_LPCR, lpcr); + + return 1; +} + +static int __init feat_enable_idle_stop(struct dt_cpu_feature *f) +{ + u64 lpcr; + + /* Set PECE wakeup modes for ISAv3.0B */ + lpcr = mfspr(SPRN_LPCR); + lpcr |= LPCR_PECE0; + lpcr |= LPCR_PECE1; + lpcr |= LPCR_PECE2; + mtspr(SPRN_LPCR, lpcr); + + return 1; +} + +static int __init feat_enable_mmu_hash(struct dt_cpu_feature *f) +{ + u64 lpcr; + + if (!IS_ENABLED(CONFIG_PPC_64S_HASH_MMU)) + return 0; + + lpcr = mfspr(SPRN_LPCR); + lpcr &= ~LPCR_ISL; + + /* VRMASD */ + lpcr |= LPCR_VPM0; + lpcr &= ~LPCR_VPM1; + lpcr |= 0x10UL << LPCR_VRMASD_SH; /* L=1 LP=00 */ + mtspr(SPRN_LPCR, lpcr); + + cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE; + cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU; + + return 1; +} + +static int __init feat_enable_mmu_hash_v3(struct dt_cpu_feature *f) +{ + u64 lpcr; + + if (!IS_ENABLED(CONFIG_PPC_64S_HASH_MMU)) + return 0; + + lpcr = mfspr(SPRN_LPCR); + lpcr &= ~(LPCR_ISL | LPCR_UPRT | LPCR_HR); + mtspr(SPRN_LPCR, lpcr); + + cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE; + cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU; + + return 1; +} + + +static int __init feat_enable_mmu_radix(struct dt_cpu_feature *f) +{ + if (!IS_ENABLED(CONFIG_PPC_RADIX_MMU)) + return 0; + + cur_cpu_spec->mmu_features |= MMU_FTR_KERNEL_RO; + cur_cpu_spec->mmu_features |= MMU_FTR_TYPE_RADIX; + cur_cpu_spec->mmu_features |= MMU_FTR_GTSE; + cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU; + + return 1; +} + +static int __init feat_enable_dscr(struct dt_cpu_feature *f) +{ + u64 lpcr; + + /* + * Linux relies on FSCR[DSCR] being clear, so that we can take the + * facility unavailable interrupt and track the task's usage of DSCR. + * See facility_unavailable_exception(). + * Clear the bit here so that feat_enable() doesn't set it. + */ + f->fscr_bit_nr = -1; + + feat_enable(f); + + lpcr = mfspr(SPRN_LPCR); + lpcr &= ~LPCR_DPFD; + lpcr |= (4UL << LPCR_DPFD_SH); + mtspr(SPRN_LPCR, lpcr); + + return 1; +} + +static void __init hfscr_pmu_enable(void) +{ + u64 hfscr = mfspr(SPRN_HFSCR); + hfscr |= PPC_BIT(60); + mtspr(SPRN_HFSCR, hfscr); +} + +static void init_pmu_power8(void) +{ + if (hv_mode) { + mtspr(SPRN_MMCRC, 0); + mtspr(SPRN_MMCRH, 0); + } + + mtspr(SPRN_MMCRA, 0); + mtspr(SPRN_MMCR0, MMCR0_FC); + mtspr(SPRN_MMCR1, 0); + mtspr(SPRN_MMCR2, 0); + mtspr(SPRN_MMCRS, 0); +} + +static int __init feat_enable_mce_power8(struct dt_cpu_feature *f) +{ + cur_cpu_spec->platform = "power8"; + cur_cpu_spec->machine_check_early = __machine_check_early_realmode_p8; + + return 1; +} + +static int __init feat_enable_pmu_power8(struct dt_cpu_feature *f) +{ + hfscr_pmu_enable(); + + init_pmu_power8(); + init_pmu_registers = init_pmu_power8; + + cur_cpu_spec->cpu_features |= CPU_FTR_MMCRA; + cur_cpu_spec->cpu_user_features |= PPC_FEATURE_PSERIES_PERFMON_COMPAT; + if (pvr_version_is(PVR_POWER8E)) + cur_cpu_spec->cpu_features |= CPU_FTR_PMAO_BUG; + + cur_cpu_spec->num_pmcs = 6; + cur_cpu_spec->pmc_type = PPC_PMC_IBM; + + return 1; +} + +static void init_pmu_power9(void) +{ + if (hv_mode) + mtspr(SPRN_MMCRC, 0); + + mtspr(SPRN_MMCRA, 0); + mtspr(SPRN_MMCR0, MMCR0_FC); + mtspr(SPRN_MMCR1, 0); + mtspr(SPRN_MMCR2, 0); +} + +static int __init feat_enable_mce_power9(struct dt_cpu_feature *f) +{ + cur_cpu_spec->platform = "power9"; + cur_cpu_spec->machine_check_early = __machine_check_early_realmode_p9; + + return 1; +} + +static int __init feat_enable_pmu_power9(struct dt_cpu_feature *f) +{ + hfscr_pmu_enable(); + + init_pmu_power9(); + init_pmu_registers = init_pmu_power9; + + cur_cpu_spec->cpu_features |= CPU_FTR_MMCRA; + cur_cpu_spec->cpu_user_features |= PPC_FEATURE_PSERIES_PERFMON_COMPAT; + + cur_cpu_spec->num_pmcs = 6; + cur_cpu_spec->pmc_type = PPC_PMC_IBM; + + return 1; +} + +static void init_pmu_power10(void) +{ + init_pmu_power9(); + + mtspr(SPRN_MMCR3, 0); + mtspr(SPRN_MMCRA, MMCRA_BHRB_DISABLE); + mtspr(SPRN_MMCR0, MMCR0_FC | MMCR0_PMCCEXT); +} + +static int __init feat_enable_pmu_power10(struct dt_cpu_feature *f) +{ + hfscr_pmu_enable(); + + init_pmu_power10(); + init_pmu_registers = init_pmu_power10; + + cur_cpu_spec->cpu_features |= CPU_FTR_MMCRA; + cur_cpu_spec->cpu_user_features |= PPC_FEATURE_PSERIES_PERFMON_COMPAT; + + cur_cpu_spec->num_pmcs = 6; + cur_cpu_spec->pmc_type = PPC_PMC_IBM; + + return 1; +} + +static int __init feat_enable_mce_power10(struct dt_cpu_feature *f) +{ + cur_cpu_spec->platform = "power10"; + cur_cpu_spec->machine_check_early = __machine_check_early_realmode_p10; + + return 1; +} + +static int __init feat_enable_tm(struct dt_cpu_feature *f) +{ +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + feat_enable(f); + cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_HTM_NOSC; + return 1; +#endif + return 0; +} + +static int __init feat_enable_fp(struct dt_cpu_feature *f) +{ + feat_enable(f); + cur_cpu_spec->cpu_features &= ~CPU_FTR_FPU_UNAVAILABLE; + + return 1; +} + +static int __init feat_enable_vector(struct dt_cpu_feature *f) +{ +#ifdef CONFIG_ALTIVEC + feat_enable(f); + cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC; + cur_cpu_spec->cpu_features |= CPU_FTR_VMX_COPY; + cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC; + + return 1; +#endif + return 0; +} + +static int __init feat_enable_vsx(struct dt_cpu_feature *f) +{ +#ifdef CONFIG_VSX + feat_enable(f); + cur_cpu_spec->cpu_features |= CPU_FTR_VSX; + cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_VSX; + + return 1; +#endif + return 0; +} + +static int __init feat_enable_purr(struct dt_cpu_feature *f) +{ + cur_cpu_spec->cpu_features |= CPU_FTR_PURR | CPU_FTR_SPURR; + + return 1; +} + +static int __init feat_enable_ebb(struct dt_cpu_feature *f) +{ + /* + * PPC_FEATURE2_EBB is enabled in PMU init code because it has + * historically been related to the PMU facility. This may have + * to be decoupled if EBB becomes more generic. For now, follow + * existing convention. + */ + f->hwcap_bit_nr = -1; + feat_enable(f); + + return 1; +} + +static int __init feat_enable_dbell(struct dt_cpu_feature *f) +{ + u64 lpcr; + + /* P9 has an HFSCR for privileged state */ + feat_enable(f); + + cur_cpu_spec->cpu_features |= CPU_FTR_DBELL; + + lpcr = mfspr(SPRN_LPCR); + lpcr |= LPCR_PECEDH; /* hyp doorbell wakeup */ + mtspr(SPRN_LPCR, lpcr); + + return 1; +} + +static int __init feat_enable_hvi(struct dt_cpu_feature *f) +{ + u64 lpcr; + + /* + * POWER9 XIVE interrupts including in OPAL XICS compatibility + * are always delivered as hypervisor virtualization interrupts (HVI) + * rather than EE. + * + * However LPES0 is not set here, in the chance that an EE does get + * delivered to the host somehow, the EE handler would not expect it + * to be delivered in LPES0 mode (e.g., using SRR[01]). This could + * happen if there is a bug in interrupt controller code, or IC is + * misconfigured in systemsim. + */ + + lpcr = mfspr(SPRN_LPCR); + lpcr |= LPCR_HVICE; /* enable hvi interrupts */ + lpcr |= LPCR_HEIC; /* disable ee interrupts when MSR_HV */ + lpcr |= LPCR_PECE_HVEE; /* hvi can wake from stop */ + mtspr(SPRN_LPCR, lpcr); + + return 1; +} + +static int __init feat_enable_large_ci(struct dt_cpu_feature *f) +{ + cur_cpu_spec->mmu_features |= MMU_FTR_CI_LARGE_PAGE; + + return 1; +} + +static int __init feat_enable_mma(struct dt_cpu_feature *f) +{ + u64 pcr; + + feat_enable(f); + pcr = mfspr(SPRN_PCR); + pcr &= ~PCR_MMA_DIS; + mtspr(SPRN_PCR, pcr); + + return 1; +} + +struct dt_cpu_feature_match { + const char *name; + int (*enable)(struct dt_cpu_feature *f); + u64 cpu_ftr_bit_mask; +}; + +static struct dt_cpu_feature_match __initdata + dt_cpu_feature_match_table[] = { + {"hypervisor", feat_enable_hv, 0}, + {"big-endian", feat_enable, 0}, + {"little-endian", feat_enable_le, CPU_FTR_REAL_LE}, + {"smt", feat_enable_smt, 0}, + {"interrupt-facilities", feat_enable, 0}, + {"system-call-vectored", feat_enable, 0}, + {"timer-facilities", feat_enable, 0}, + {"timer-facilities-v3", feat_enable, 0}, + {"debug-facilities", feat_enable, 0}, + {"come-from-address-register", feat_enable, CPU_FTR_CFAR}, + {"branch-tracing", feat_enable, 0}, + {"floating-point", feat_enable_fp, 0}, + {"vector", feat_enable_vector, 0}, + {"vector-scalar", feat_enable_vsx, 0}, + {"vector-scalar-v3", feat_enable, 0}, + {"decimal-floating-point", feat_enable, 0}, + {"decimal-integer", feat_enable, 0}, + {"quadword-load-store", feat_enable, 0}, + {"vector-crypto", feat_enable, 0}, + {"mmu-hash", feat_enable_mmu_hash, 0}, + {"mmu-radix", feat_enable_mmu_radix, 0}, + {"mmu-hash-v3", feat_enable_mmu_hash_v3, 0}, + {"virtual-page-class-key-protection", feat_enable, 0}, + {"transactional-memory", feat_enable_tm, CPU_FTR_TM}, + {"transactional-memory-v3", feat_enable_tm, 0}, + {"tm-suspend-hypervisor-assist", feat_enable, CPU_FTR_P9_TM_HV_ASSIST}, + {"tm-suspend-xer-so-bug", feat_enable, CPU_FTR_P9_TM_XER_SO_BUG}, + {"idle-nap", feat_enable_idle_nap, 0}, + /* alignment-interrupt-dsisr ignored */ + {"idle-stop", feat_enable_idle_stop, 0}, + {"machine-check-power8", feat_enable_mce_power8, 0}, + {"performance-monitor-power8", feat_enable_pmu_power8, 0}, + {"data-stream-control-register", feat_enable_dscr, CPU_FTR_DSCR}, + {"event-based-branch", feat_enable_ebb, 0}, + {"target-address-register", feat_enable, 0}, + {"branch-history-rolling-buffer", feat_enable, 0}, + {"control-register", feat_enable, CPU_FTR_CTRL}, + {"processor-control-facility", feat_enable_dbell, CPU_FTR_DBELL}, + {"processor-control-facility-v3", feat_enable_dbell, CPU_FTR_DBELL}, + {"processor-utilization-of-resources-register", feat_enable_purr, 0}, + {"no-execute", feat_enable, 0}, + {"strong-access-ordering", feat_enable, CPU_FTR_SAO}, + {"cache-inhibited-large-page", feat_enable_large_ci, 0}, + {"coprocessor-icswx", feat_enable, 0}, + {"hypervisor-virtualization-interrupt", feat_enable_hvi, 0}, + {"program-priority-register", feat_enable, CPU_FTR_HAS_PPR}, + {"wait", feat_enable, 0}, + {"atomic-memory-operations", feat_enable, 0}, + {"branch-v3", feat_enable, 0}, + {"copy-paste", feat_enable, 0}, + {"decimal-floating-point-v3", feat_enable, 0}, + {"decimal-integer-v3", feat_enable, 0}, + {"fixed-point-v3", feat_enable, 0}, + {"floating-point-v3", feat_enable, 0}, + {"group-start-register", feat_enable, 0}, + {"pc-relative-addressing", feat_enable, 0}, + {"machine-check-power9", feat_enable_mce_power9, 0}, + {"machine-check-power10", feat_enable_mce_power10, 0}, + {"performance-monitor-power9", feat_enable_pmu_power9, 0}, + {"performance-monitor-power10", feat_enable_pmu_power10, 0}, + {"event-based-branch-v3", feat_enable, 0}, + {"random-number-generator", feat_enable, 0}, + {"system-call-vectored", feat_disable, 0}, + {"trace-interrupt-v3", feat_enable, 0}, + {"vector-v3", feat_enable, 0}, + {"vector-binary128", feat_enable, 0}, + {"vector-binary16", feat_enable, 0}, + {"wait-v3", feat_enable, 0}, + {"prefix-instructions", feat_enable, 0}, + {"matrix-multiply-assist", feat_enable_mma, 0}, + {"debug-facilities-v31", feat_enable, CPU_FTR_DAWR1}, +}; + +static bool __initdata using_dt_cpu_ftrs; +static bool __initdata enable_unknown = true; + +static int __init dt_cpu_ftrs_parse(char *str) +{ + if (!str) + return 0; + + if (!strcmp(str, "off")) + using_dt_cpu_ftrs = false; + else if (!strcmp(str, "known")) + enable_unknown = false; + else + return 1; + + return 0; +} +early_param("dt_cpu_ftrs", dt_cpu_ftrs_parse); + +static void __init cpufeatures_setup_start(u32 isa) +{ + pr_info("setup for ISA %d\n", isa); + + if (isa >= ISA_V3_0B) { + cur_cpu_spec->cpu_features |= CPU_FTR_ARCH_300; + cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_ARCH_3_00; + } + + if (isa >= ISA_V3_1) { + cur_cpu_spec->cpu_features |= CPU_FTR_ARCH_31; + cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_ARCH_3_1; + } +} + +static bool __init cpufeatures_process_feature(struct dt_cpu_feature *f) +{ + const struct dt_cpu_feature_match *m; + bool known = false; + int i; + + for (i = 0; i < ARRAY_SIZE(dt_cpu_feature_match_table); i++) { + m = &dt_cpu_feature_match_table[i]; + if (!strcmp(f->name, m->name)) { + known = true; + if (m->enable(f)) { + cur_cpu_spec->cpu_features |= m->cpu_ftr_bit_mask; + break; + } + + pr_info("not enabling: %s (disabled or unsupported by kernel)\n", + f->name); + return false; + } + } + + if (!known && (!enable_unknown || !feat_try_enable_unknown(f))) { + pr_info("not enabling: %s (unknown and unsupported by kernel)\n", + f->name); + return false; + } + + if (known) + pr_debug("enabling: %s\n", f->name); + else + pr_debug("enabling: %s (unknown)\n", f->name); + + return true; +} + +/* + * Handle POWER9 broadcast tlbie invalidation issue using + * cpu feature flag. + */ +static __init void update_tlbie_feature_flag(unsigned long pvr) +{ + if (PVR_VER(pvr) == PVR_POWER9) { + /* + * Set the tlbie feature flag for anything below + * Nimbus DD 2.3 and Cumulus DD 1.3 + */ + if ((pvr & 0xe000) == 0) { + /* Nimbus */ + if ((pvr & 0xfff) < 0x203) + cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_STQ_BUG; + } else if ((pvr & 0xc000) == 0) { + /* Cumulus */ + if ((pvr & 0xfff) < 0x103) + cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_STQ_BUG; + } else { + WARN_ONCE(1, "Unknown PVR"); + cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_STQ_BUG; + } + + cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_ERAT_BUG; + } +} + +static __init void cpufeatures_cpu_quirks(void) +{ + unsigned long version = mfspr(SPRN_PVR); + + /* + * Not all quirks can be derived from the cpufeatures device tree. + */ + if ((version & 0xffffefff) == 0x004e0200) { + /* DD2.0 has no feature flag */ + cur_cpu_spec->cpu_features |= CPU_FTR_P9_RADIX_PREFETCH_BUG; + cur_cpu_spec->cpu_features &= ~(CPU_FTR_DAWR); + } else if ((version & 0xffffefff) == 0x004e0201) { + cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1; + cur_cpu_spec->cpu_features |= CPU_FTR_P9_RADIX_PREFETCH_BUG; + cur_cpu_spec->cpu_features &= ~(CPU_FTR_DAWR); + } else if ((version & 0xffffefff) == 0x004e0202) { + cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_HV_ASSIST; + cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_XER_SO_BUG; + cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1; + cur_cpu_spec->cpu_features &= ~(CPU_FTR_DAWR); + } else if ((version & 0xffffefff) == 0x004e0203) { + cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_HV_ASSIST; + cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_XER_SO_BUG; + cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1; + } else if ((version & 0xffff0000) == 0x004e0000) { + /* DD2.1 and up have DD2_1 */ + cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1; + } + + if ((version & 0xffff0000) == 0x004e0000) { + cur_cpu_spec->cpu_features |= CPU_FTR_P9_TIDR; + } + + update_tlbie_feature_flag(version); +} + +static void __init cpufeatures_setup_finished(void) +{ + cpufeatures_cpu_quirks(); + + if (hv_mode && !(cur_cpu_spec->cpu_features & CPU_FTR_HVMODE)) { + pr_err("hypervisor not present in device tree but HV mode is enabled in the CPU. Enabling.\n"); + cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE; + } + + /* Make sure powerpc_base_platform is non-NULL */ + powerpc_base_platform = cur_cpu_spec->platform; + + system_registers.lpcr = mfspr(SPRN_LPCR); + system_registers.hfscr = mfspr(SPRN_HFSCR); + system_registers.fscr = mfspr(SPRN_FSCR); + system_registers.pcr = mfspr(SPRN_PCR); + + pr_info("final cpu/mmu features = 0x%016lx 0x%08x\n", + cur_cpu_spec->cpu_features, cur_cpu_spec->mmu_features); +} + +static int __init disabled_on_cmdline(void) +{ + unsigned long root, chosen; + const char *p; + + root = of_get_flat_dt_root(); + chosen = of_get_flat_dt_subnode_by_name(root, "chosen"); + if (chosen == -FDT_ERR_NOTFOUND) + return false; + + p = of_get_flat_dt_prop(chosen, "bootargs", NULL); + if (!p) + return false; + + if (strstr(p, "dt_cpu_ftrs=off")) + return true; + + return false; +} + +static int __init fdt_find_cpu_features(unsigned long node, const char *uname, + int depth, void *data) +{ + if (of_flat_dt_is_compatible(node, "ibm,powerpc-cpu-features") + && of_get_flat_dt_prop(node, "isa", NULL)) + return 1; + + return 0; +} + +bool __init dt_cpu_ftrs_in_use(void) +{ + return using_dt_cpu_ftrs; +} + +bool __init dt_cpu_ftrs_init(void *fdt) +{ + using_dt_cpu_ftrs = false; + + /* Setup and verify the FDT, if it fails we just bail */ + if (!early_init_dt_verify(fdt)) + return false; + + if (!of_scan_flat_dt(fdt_find_cpu_features, NULL)) + return false; + + if (disabled_on_cmdline()) + return false; + + cpufeatures_setup_cpu(); + + using_dt_cpu_ftrs = true; + return true; +} + +static int nr_dt_cpu_features; +static struct dt_cpu_feature *dt_cpu_features; + +static int __init process_cpufeatures_node(unsigned long node, + const char *uname, int i) +{ + const __be32 *prop; + struct dt_cpu_feature *f; + int len; + + f = &dt_cpu_features[i]; + + f->node = node; + + f->name = uname; + + prop = of_get_flat_dt_prop(node, "isa", &len); + if (!prop) { + pr_warn("%s: missing isa property\n", uname); + return 0; + } + f->isa = be32_to_cpup(prop); + + prop = of_get_flat_dt_prop(node, "usable-privilege", &len); + if (!prop) { + pr_warn("%s: missing usable-privilege property", uname); + return 0; + } + f->usable_privilege = be32_to_cpup(prop); + + prop = of_get_flat_dt_prop(node, "hv-support", &len); + if (prop) + f->hv_support = be32_to_cpup(prop); + else + f->hv_support = HV_SUPPORT_NONE; + + prop = of_get_flat_dt_prop(node, "os-support", &len); + if (prop) + f->os_support = be32_to_cpup(prop); + else + f->os_support = OS_SUPPORT_NONE; + + prop = of_get_flat_dt_prop(node, "hfscr-bit-nr", &len); + if (prop) + f->hfscr_bit_nr = be32_to_cpup(prop); + else + f->hfscr_bit_nr = -1; + prop = of_get_flat_dt_prop(node, "fscr-bit-nr", &len); + if (prop) + f->fscr_bit_nr = be32_to_cpup(prop); + else + f->fscr_bit_nr = -1; + prop = of_get_flat_dt_prop(node, "hwcap-bit-nr", &len); + if (prop) + f->hwcap_bit_nr = be32_to_cpup(prop); + else + f->hwcap_bit_nr = -1; + + if (f->usable_privilege & USABLE_HV) { + if (!(mfmsr() & MSR_HV)) { + pr_warn("%s: HV feature passed to guest\n", uname); + return 0; + } + + if (f->hv_support == HV_SUPPORT_NONE && f->hfscr_bit_nr != -1) { + pr_warn("%s: unwanted hfscr_bit_nr\n", uname); + return 0; + } + + if (f->hv_support == HV_SUPPORT_HFSCR) { + if (f->hfscr_bit_nr == -1) { + pr_warn("%s: missing hfscr_bit_nr\n", uname); + return 0; + } + } + } else { + if (f->hv_support != HV_SUPPORT_NONE || f->hfscr_bit_nr != -1) { + pr_warn("%s: unwanted hv_support/hfscr_bit_nr\n", uname); + return 0; + } + } + + if (f->usable_privilege & USABLE_OS) { + if (f->os_support == OS_SUPPORT_NONE && f->fscr_bit_nr != -1) { + pr_warn("%s: unwanted fscr_bit_nr\n", uname); + return 0; + } + + if (f->os_support == OS_SUPPORT_FSCR) { + if (f->fscr_bit_nr == -1) { + pr_warn("%s: missing fscr_bit_nr\n", uname); + return 0; + } + } + } else { + if (f->os_support != OS_SUPPORT_NONE || f->fscr_bit_nr != -1) { + pr_warn("%s: unwanted os_support/fscr_bit_nr\n", uname); + return 0; + } + } + + if (!(f->usable_privilege & USABLE_PR)) { + if (f->hwcap_bit_nr != -1) { + pr_warn("%s: unwanted hwcap_bit_nr\n", uname); + return 0; + } + } + + /* Do all the independent features in the first pass */ + if (!of_get_flat_dt_prop(node, "dependencies", &len)) { + if (cpufeatures_process_feature(f)) + f->enabled = 1; + else + f->disabled = 1; + } + + return 0; +} + +static void __init cpufeatures_deps_enable(struct dt_cpu_feature *f) +{ + const __be32 *prop; + int len; + int nr_deps; + int i; + + if (f->enabled || f->disabled) + return; + + prop = of_get_flat_dt_prop(f->node, "dependencies", &len); + if (!prop) { + pr_warn("%s: missing dependencies property", f->name); + return; + } + + nr_deps = len / sizeof(int); + + for (i = 0; i < nr_deps; i++) { + unsigned long phandle = be32_to_cpu(prop[i]); + int j; + + for (j = 0; j < nr_dt_cpu_features; j++) { + struct dt_cpu_feature *d = &dt_cpu_features[j]; + + if (of_get_flat_dt_phandle(d->node) == phandle) { + cpufeatures_deps_enable(d); + if (d->disabled) { + f->disabled = 1; + return; + } + } + } + } + + if (cpufeatures_process_feature(f)) + f->enabled = 1; + else + f->disabled = 1; +} + +static int __init scan_cpufeatures_subnodes(unsigned long node, + const char *uname, + void *data) +{ + int *count = data; + + process_cpufeatures_node(node, uname, *count); + + (*count)++; + + return 0; +} + +static int __init count_cpufeatures_subnodes(unsigned long node, + const char *uname, + void *data) +{ + int *count = data; + + (*count)++; + + return 0; +} + +static int __init dt_cpu_ftrs_scan_callback(unsigned long node, const char + *uname, int depth, void *data) +{ + const __be32 *prop; + int count, i; + u32 isa; + + /* We are scanning "ibm,powerpc-cpu-features" nodes only */ + if (!of_flat_dt_is_compatible(node, "ibm,powerpc-cpu-features")) + return 0; + + prop = of_get_flat_dt_prop(node, "isa", NULL); + if (!prop) + /* We checked before, "can't happen" */ + return 0; + + isa = be32_to_cpup(prop); + + /* Count and allocate space for cpu features */ + of_scan_flat_dt_subnodes(node, count_cpufeatures_subnodes, + &nr_dt_cpu_features); + dt_cpu_features = memblock_alloc(sizeof(struct dt_cpu_feature) * nr_dt_cpu_features, PAGE_SIZE); + if (!dt_cpu_features) + panic("%s: Failed to allocate %zu bytes align=0x%lx\n", + __func__, + sizeof(struct dt_cpu_feature) * nr_dt_cpu_features, + PAGE_SIZE); + + cpufeatures_setup_start(isa); + + /* Scan nodes into dt_cpu_features and enable those without deps */ + count = 0; + of_scan_flat_dt_subnodes(node, scan_cpufeatures_subnodes, &count); + + /* Recursive enable remaining features with dependencies */ + for (i = 0; i < nr_dt_cpu_features; i++) { + struct dt_cpu_feature *f = &dt_cpu_features[i]; + + cpufeatures_deps_enable(f); + } + + prop = of_get_flat_dt_prop(node, "display-name", NULL); + if (prop && strlen((char *)prop) != 0) { + strscpy(dt_cpu_name, (char *)prop, sizeof(dt_cpu_name)); + cur_cpu_spec->cpu_name = dt_cpu_name; + } + + cpufeatures_setup_finished(); + + memblock_free(dt_cpu_features, + sizeof(struct dt_cpu_feature) * nr_dt_cpu_features); + + return 0; +} + +void __init dt_cpu_ftrs_scan(void) +{ + if (!using_dt_cpu_ftrs) + return; + + of_scan_flat_dt(dt_cpu_ftrs_scan_callback, NULL); +} diff --git a/arch/powerpc/kernel/early_32.c b/arch/powerpc/kernel/early_32.c new file mode 100644 index 000000000..03f1135ef --- /dev/null +++ b/arch/powerpc/kernel/early_32.c @@ -0,0 +1,38 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * Early init before relocation + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <asm/setup.h> +#include <asm/sections.h> + +/* + * We're called here very early in the boot. + * + * Note that the kernel may be running at an address which is different + * from the address that it was linked at, so we must use RELOC/PTRRELOC + * to access static data (including strings). -- paulus + */ +notrace unsigned long __init early_init(unsigned long dt_ptr) +{ + unsigned long kva, offset = reloc_offset(); + + kva = *PTRRELOC(&kernstart_virt_addr); + + /* First zero the BSS */ + if (kva == KERNELBASE) + memset(PTRRELOC(&__bss_start), 0, __bss_stop - __bss_start); + + /* + * Identify the CPU type and fix up code sections + * that depend on which cpu we have. + */ + identify_cpu(offset, mfspr(SPRN_PVR)); + + apply_feature_fixups(); + + return kva + offset; +} diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c new file mode 100644 index 000000000..ab316e155 --- /dev/null +++ b/arch/powerpc/kernel/eeh.c @@ -0,0 +1,1941 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright IBM Corporation 2001, 2005, 2006 + * Copyright Dave Engebretsen & Todd Inglett 2001 + * Copyright Linas Vepstas 2005, 2006 + * Copyright 2001-2012 IBM Corporation. + * + * Please address comments and feedback to Linas Vepstas <linas@austin.ibm.com> + */ + +#include <linux/delay.h> +#include <linux/sched.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/pci.h> +#include <linux/iommu.h> +#include <linux/proc_fs.h> +#include <linux/rbtree.h> +#include <linux/reboot.h> +#include <linux/seq_file.h> +#include <linux/spinlock.h> +#include <linux/export.h> +#include <linux/of.h> +#include <linux/debugfs.h> + +#include <linux/atomic.h> +#include <asm/eeh.h> +#include <asm/eeh_event.h> +#include <asm/io.h> +#include <asm/iommu.h> +#include <asm/machdep.h> +#include <asm/ppc-pci.h> +#include <asm/rtas.h> +#include <asm/pte-walk.h> + + +/** Overview: + * EEH, or "Enhanced Error Handling" is a PCI bridge technology for + * dealing with PCI bus errors that can't be dealt with within the + * usual PCI framework, except by check-stopping the CPU. Systems + * that are designed for high-availability/reliability cannot afford + * to crash due to a "mere" PCI error, thus the need for EEH. + * An EEH-capable bridge operates by converting a detected error + * into a "slot freeze", taking the PCI adapter off-line, making + * the slot behave, from the OS'es point of view, as if the slot + * were "empty": all reads return 0xff's and all writes are silently + * ignored. EEH slot isolation events can be triggered by parity + * errors on the address or data busses (e.g. during posted writes), + * which in turn might be caused by low voltage on the bus, dust, + * vibration, humidity, radioactivity or plain-old failed hardware. + * + * Note, however, that one of the leading causes of EEH slot + * freeze events are buggy device drivers, buggy device microcode, + * or buggy device hardware. This is because any attempt by the + * device to bus-master data to a memory address that is not + * assigned to the device will trigger a slot freeze. (The idea + * is to prevent devices-gone-wild from corrupting system memory). + * Buggy hardware/drivers will have a miserable time co-existing + * with EEH. + * + * Ideally, a PCI device driver, when suspecting that an isolation + * event has occurred (e.g. by reading 0xff's), will then ask EEH + * whether this is the case, and then take appropriate steps to + * reset the PCI slot, the PCI device, and then resume operations. + * However, until that day, the checking is done here, with the + * eeh_check_failure() routine embedded in the MMIO macros. If + * the slot is found to be isolated, an "EEH Event" is synthesized + * and sent out for processing. + */ + +/* If a device driver keeps reading an MMIO register in an interrupt + * handler after a slot isolation event, it might be broken. + * This sets the threshold for how many read attempts we allow + * before printing an error message. + */ +#define EEH_MAX_FAILS 2100000 + +/* Time to wait for a PCI slot to report status, in milliseconds */ +#define PCI_BUS_RESET_WAIT_MSEC (5*60*1000) + +/* + * EEH probe mode support, which is part of the flags, + * is to support multiple platforms for EEH. Some platforms + * like pSeries do PCI emunation based on device tree. + * However, other platforms like powernv probe PCI devices + * from hardware. The flag is used to distinguish that. + * In addition, struct eeh_ops::probe would be invoked for + * particular OF node or PCI device so that the corresponding + * PE would be created there. + */ +int eeh_subsystem_flags; +EXPORT_SYMBOL(eeh_subsystem_flags); + +/* + * EEH allowed maximal frozen times. If one particular PE's + * frozen count in last hour exceeds this limit, the PE will + * be forced to be offline permanently. + */ +u32 eeh_max_freezes = 5; + +/* + * Controls whether a recovery event should be scheduled when an + * isolated device is discovered. This is only really useful for + * debugging problems with the EEH core. + */ +bool eeh_debugfs_no_recover; + +/* Platform dependent EEH operations */ +struct eeh_ops *eeh_ops = NULL; + +/* Lock to avoid races due to multiple reports of an error */ +DEFINE_RAW_SPINLOCK(confirm_error_lock); +EXPORT_SYMBOL_GPL(confirm_error_lock); + +/* Lock to protect passed flags */ +static DEFINE_MUTEX(eeh_dev_mutex); + +/* Buffer for reporting pci register dumps. Its here in BSS, and + * not dynamically alloced, so that it ends up in RMO where RTAS + * can access it. + */ +#define EEH_PCI_REGS_LOG_LEN 8192 +static unsigned char pci_regs_buf[EEH_PCI_REGS_LOG_LEN]; + +/* + * The struct is used to maintain the EEH global statistic + * information. Besides, the EEH global statistics will be + * exported to user space through procfs + */ +struct eeh_stats { + u64 no_device; /* PCI device not found */ + u64 no_dn; /* OF node not found */ + u64 no_cfg_addr; /* Config address not found */ + u64 ignored_check; /* EEH check skipped */ + u64 total_mmio_ffs; /* Total EEH checks */ + u64 false_positives; /* Unnecessary EEH checks */ + u64 slot_resets; /* PE reset */ +}; + +static struct eeh_stats eeh_stats; + +static int __init eeh_setup(char *str) +{ + if (!strcmp(str, "off")) + eeh_add_flag(EEH_FORCE_DISABLED); + else if (!strcmp(str, "early_log")) + eeh_add_flag(EEH_EARLY_DUMP_LOG); + + return 1; +} +__setup("eeh=", eeh_setup); + +void eeh_show_enabled(void) +{ + if (eeh_has_flag(EEH_FORCE_DISABLED)) + pr_info("EEH: Recovery disabled by kernel parameter.\n"); + else if (eeh_has_flag(EEH_ENABLED)) + pr_info("EEH: Capable adapter found: recovery enabled.\n"); + else + pr_info("EEH: No capable adapters found: recovery disabled.\n"); +} + +/* + * This routine captures assorted PCI configuration space data + * for the indicated PCI device, and puts them into a buffer + * for RTAS error logging. + */ +static size_t eeh_dump_dev_log(struct eeh_dev *edev, char *buf, size_t len) +{ + u32 cfg; + int cap, i; + int n = 0, l = 0; + char buffer[128]; + + n += scnprintf(buf+n, len-n, "%04x:%02x:%02x.%01x\n", + edev->pe->phb->global_number, edev->bdfn >> 8, + PCI_SLOT(edev->bdfn), PCI_FUNC(edev->bdfn)); + pr_warn("EEH: of node=%04x:%02x:%02x.%01x\n", + edev->pe->phb->global_number, edev->bdfn >> 8, + PCI_SLOT(edev->bdfn), PCI_FUNC(edev->bdfn)); + + eeh_ops->read_config(edev, PCI_VENDOR_ID, 4, &cfg); + n += scnprintf(buf+n, len-n, "dev/vend:%08x\n", cfg); + pr_warn("EEH: PCI device/vendor: %08x\n", cfg); + + eeh_ops->read_config(edev, PCI_COMMAND, 4, &cfg); + n += scnprintf(buf+n, len-n, "cmd/stat:%x\n", cfg); + pr_warn("EEH: PCI cmd/status register: %08x\n", cfg); + + /* Gather bridge-specific registers */ + if (edev->mode & EEH_DEV_BRIDGE) { + eeh_ops->read_config(edev, PCI_SEC_STATUS, 2, &cfg); + n += scnprintf(buf+n, len-n, "sec stat:%x\n", cfg); + pr_warn("EEH: Bridge secondary status: %04x\n", cfg); + + eeh_ops->read_config(edev, PCI_BRIDGE_CONTROL, 2, &cfg); + n += scnprintf(buf+n, len-n, "brdg ctl:%x\n", cfg); + pr_warn("EEH: Bridge control: %04x\n", cfg); + } + + /* Dump out the PCI-X command and status regs */ + cap = edev->pcix_cap; + if (cap) { + eeh_ops->read_config(edev, cap, 4, &cfg); + n += scnprintf(buf+n, len-n, "pcix-cmd:%x\n", cfg); + pr_warn("EEH: PCI-X cmd: %08x\n", cfg); + + eeh_ops->read_config(edev, cap+4, 4, &cfg); + n += scnprintf(buf+n, len-n, "pcix-stat:%x\n", cfg); + pr_warn("EEH: PCI-X status: %08x\n", cfg); + } + + /* If PCI-E capable, dump PCI-E cap 10 */ + cap = edev->pcie_cap; + if (cap) { + n += scnprintf(buf+n, len-n, "pci-e cap10:\n"); + pr_warn("EEH: PCI-E capabilities and status follow:\n"); + + for (i=0; i<=8; i++) { + eeh_ops->read_config(edev, cap+4*i, 4, &cfg); + n += scnprintf(buf+n, len-n, "%02x:%x\n", 4*i, cfg); + + if ((i % 4) == 0) { + if (i != 0) + pr_warn("%s\n", buffer); + + l = scnprintf(buffer, sizeof(buffer), + "EEH: PCI-E %02x: %08x ", + 4*i, cfg); + } else { + l += scnprintf(buffer+l, sizeof(buffer)-l, + "%08x ", cfg); + } + + } + + pr_warn("%s\n", buffer); + } + + /* If AER capable, dump it */ + cap = edev->aer_cap; + if (cap) { + n += scnprintf(buf+n, len-n, "pci-e AER:\n"); + pr_warn("EEH: PCI-E AER capability register set follows:\n"); + + for (i=0; i<=13; i++) { + eeh_ops->read_config(edev, cap+4*i, 4, &cfg); + n += scnprintf(buf+n, len-n, "%02x:%x\n", 4*i, cfg); + + if ((i % 4) == 0) { + if (i != 0) + pr_warn("%s\n", buffer); + + l = scnprintf(buffer, sizeof(buffer), + "EEH: PCI-E AER %02x: %08x ", + 4*i, cfg); + } else { + l += scnprintf(buffer+l, sizeof(buffer)-l, + "%08x ", cfg); + } + } + + pr_warn("%s\n", buffer); + } + + return n; +} + +static void *eeh_dump_pe_log(struct eeh_pe *pe, void *flag) +{ + struct eeh_dev *edev, *tmp; + size_t *plen = flag; + + eeh_pe_for_each_dev(pe, edev, tmp) + *plen += eeh_dump_dev_log(edev, pci_regs_buf + *plen, + EEH_PCI_REGS_LOG_LEN - *plen); + + return NULL; +} + +/** + * eeh_slot_error_detail - Generate combined log including driver log and error log + * @pe: EEH PE + * @severity: temporary or permanent error log + * + * This routine should be called to generate the combined log, which + * is comprised of driver log and error log. The driver log is figured + * out from the config space of the corresponding PCI device, while + * the error log is fetched through platform dependent function call. + */ +void eeh_slot_error_detail(struct eeh_pe *pe, int severity) +{ + size_t loglen = 0; + + /* + * When the PHB is fenced or dead, it's pointless to collect + * the data from PCI config space because it should return + * 0xFF's. For ER, we still retrieve the data from the PCI + * config space. + * + * For pHyp, we have to enable IO for log retrieval. Otherwise, + * 0xFF's is always returned from PCI config space. + * + * When the @severity is EEH_LOG_PERM, the PE is going to be + * removed. Prior to that, the drivers for devices included in + * the PE will be closed. The drivers rely on working IO path + * to bring the devices to quiet state. Otherwise, PCI traffic + * from those devices after they are removed is like to cause + * another unexpected EEH error. + */ + if (!(pe->type & EEH_PE_PHB)) { + if (eeh_has_flag(EEH_ENABLE_IO_FOR_LOG) || + severity == EEH_LOG_PERM) + eeh_pci_enable(pe, EEH_OPT_THAW_MMIO); + + /* + * The config space of some PCI devices can't be accessed + * when their PEs are in frozen state. Otherwise, fenced + * PHB might be seen. Those PEs are identified with flag + * EEH_PE_CFG_RESTRICTED, indicating EEH_PE_CFG_BLOCKED + * is set automatically when the PE is put to EEH_PE_ISOLATED. + * + * Restoring BARs possibly triggers PCI config access in + * (OPAL) firmware and then causes fenced PHB. If the + * PCI config is blocked with flag EEH_PE_CFG_BLOCKED, it's + * pointless to restore BARs and dump config space. + */ + eeh_ops->configure_bridge(pe); + if (!(pe->state & EEH_PE_CFG_BLOCKED)) { + eeh_pe_restore_bars(pe); + + pci_regs_buf[0] = 0; + eeh_pe_traverse(pe, eeh_dump_pe_log, &loglen); + } + } + + eeh_ops->get_log(pe, severity, pci_regs_buf, loglen); +} + +/** + * eeh_token_to_phys - Convert EEH address token to phys address + * @token: I/O token, should be address in the form 0xA.... + * + * This routine should be called to convert virtual I/O address + * to physical one. + */ +static inline unsigned long eeh_token_to_phys(unsigned long token) +{ + return ppc_find_vmap_phys(token); +} + +/* + * On PowerNV platform, we might already have fenced PHB there. + * For that case, it's meaningless to recover frozen PE. Intead, + * We have to handle fenced PHB firstly. + */ +static int eeh_phb_check_failure(struct eeh_pe *pe) +{ + struct eeh_pe *phb_pe; + unsigned long flags; + int ret; + + if (!eeh_has_flag(EEH_PROBE_MODE_DEV)) + return -EPERM; + + /* Find the PHB PE */ + phb_pe = eeh_phb_pe_get(pe->phb); + if (!phb_pe) { + pr_warn("%s Can't find PE for PHB#%x\n", + __func__, pe->phb->global_number); + return -EEXIST; + } + + /* If the PHB has been in problematic state */ + eeh_serialize_lock(&flags); + if (phb_pe->state & EEH_PE_ISOLATED) { + ret = 0; + goto out; + } + + /* Check PHB state */ + ret = eeh_ops->get_state(phb_pe, NULL); + if ((ret < 0) || + (ret == EEH_STATE_NOT_SUPPORT) || eeh_state_active(ret)) { + ret = 0; + goto out; + } + + /* Isolate the PHB and send event */ + eeh_pe_mark_isolated(phb_pe); + eeh_serialize_unlock(flags); + + pr_debug("EEH: PHB#%x failure detected, location: %s\n", + phb_pe->phb->global_number, eeh_pe_loc_get(phb_pe)); + eeh_send_failure_event(phb_pe); + return 1; +out: + eeh_serialize_unlock(flags); + return ret; +} + +static inline const char *eeh_driver_name(struct pci_dev *pdev) +{ + if (pdev) + return dev_driver_string(&pdev->dev); + + return "<null>"; +} + +/** + * eeh_dev_check_failure - Check if all 1's data is due to EEH slot freeze + * @edev: eeh device + * + * Check for an EEH failure for the given device node. Call this + * routine if the result of a read was all 0xff's and you want to + * find out if this is due to an EEH slot freeze. This routine + * will query firmware for the EEH status. + * + * Returns 0 if there has not been an EEH error; otherwise returns + * a non-zero value and queues up a slot isolation event notification. + * + * It is safe to call this routine in an interrupt context. + */ +int eeh_dev_check_failure(struct eeh_dev *edev) +{ + int ret; + unsigned long flags; + struct device_node *dn; + struct pci_dev *dev; + struct eeh_pe *pe, *parent_pe; + int rc = 0; + const char *location = NULL; + + eeh_stats.total_mmio_ffs++; + + if (!eeh_enabled()) + return 0; + + if (!edev) { + eeh_stats.no_dn++; + return 0; + } + dev = eeh_dev_to_pci_dev(edev); + pe = eeh_dev_to_pe(edev); + + /* Access to IO BARs might get this far and still not want checking. */ + if (!pe) { + eeh_stats.ignored_check++; + eeh_edev_dbg(edev, "Ignored check\n"); + return 0; + } + + /* + * On PowerNV platform, we might already have fenced PHB + * there and we need take care of that firstly. + */ + ret = eeh_phb_check_failure(pe); + if (ret > 0) + return ret; + + /* + * If the PE isn't owned by us, we shouldn't check the + * state. Instead, let the owner handle it if the PE has + * been frozen. + */ + if (eeh_pe_passed(pe)) + return 0; + + /* If we already have a pending isolation event for this + * slot, we know it's bad already, we don't need to check. + * Do this checking under a lock; as multiple PCI devices + * in one slot might report errors simultaneously, and we + * only want one error recovery routine running. + */ + eeh_serialize_lock(&flags); + rc = 1; + if (pe->state & EEH_PE_ISOLATED) { + pe->check_count++; + if (pe->check_count == EEH_MAX_FAILS) { + dn = pci_device_to_OF_node(dev); + if (dn) + location = of_get_property(dn, "ibm,loc-code", + NULL); + eeh_edev_err(edev, "%d reads ignored for recovering device at location=%s driver=%s\n", + pe->check_count, + location ? location : "unknown", + eeh_driver_name(dev)); + eeh_edev_err(edev, "Might be infinite loop in %s driver\n", + eeh_driver_name(dev)); + dump_stack(); + } + goto dn_unlock; + } + + /* + * Now test for an EEH failure. This is VERY expensive. + * Note that the eeh_config_addr may be a parent device + * in the case of a device behind a bridge, or it may be + * function zero of a multi-function device. + * In any case they must share a common PHB. + */ + ret = eeh_ops->get_state(pe, NULL); + + /* Note that config-io to empty slots may fail; + * they are empty when they don't have children. + * We will punt with the following conditions: Failure to get + * PE's state, EEH not support and Permanently unavailable + * state, PE is in good state. + */ + if ((ret < 0) || + (ret == EEH_STATE_NOT_SUPPORT) || eeh_state_active(ret)) { + eeh_stats.false_positives++; + pe->false_positives++; + rc = 0; + goto dn_unlock; + } + + /* + * It should be corner case that the parent PE has been + * put into frozen state as well. We should take care + * that at first. + */ + parent_pe = pe->parent; + while (parent_pe) { + /* Hit the ceiling ? */ + if (parent_pe->type & EEH_PE_PHB) + break; + + /* Frozen parent PE ? */ + ret = eeh_ops->get_state(parent_pe, NULL); + if (ret > 0 && !eeh_state_active(ret)) { + pe = parent_pe; + pr_err("EEH: Failure of PHB#%x-PE#%x will be handled at parent PHB#%x-PE#%x.\n", + pe->phb->global_number, pe->addr, + pe->phb->global_number, parent_pe->addr); + } + + /* Next parent level */ + parent_pe = parent_pe->parent; + } + + eeh_stats.slot_resets++; + + /* Avoid repeated reports of this failure, including problems + * with other functions on this device, and functions under + * bridges. + */ + eeh_pe_mark_isolated(pe); + eeh_serialize_unlock(flags); + + /* Most EEH events are due to device driver bugs. Having + * a stack trace will help the device-driver authors figure + * out what happened. So print that out. + */ + pr_debug("EEH: %s: Frozen PHB#%x-PE#%x detected\n", + __func__, pe->phb->global_number, pe->addr); + eeh_send_failure_event(pe); + + return 1; + +dn_unlock: + eeh_serialize_unlock(flags); + return rc; +} + +EXPORT_SYMBOL_GPL(eeh_dev_check_failure); + +/** + * eeh_check_failure - Check if all 1's data is due to EEH slot freeze + * @token: I/O address + * + * Check for an EEH failure at the given I/O address. Call this + * routine if the result of a read was all 0xff's and you want to + * find out if this is due to an EEH slot freeze event. This routine + * will query firmware for the EEH status. + * + * Note this routine is safe to call in an interrupt context. + */ +int eeh_check_failure(const volatile void __iomem *token) +{ + unsigned long addr; + struct eeh_dev *edev; + + /* Finding the phys addr + pci device; this is pretty quick. */ + addr = eeh_token_to_phys((unsigned long __force) token); + edev = eeh_addr_cache_get_dev(addr); + if (!edev) { + eeh_stats.no_device++; + return 0; + } + + return eeh_dev_check_failure(edev); +} +EXPORT_SYMBOL(eeh_check_failure); + + +/** + * eeh_pci_enable - Enable MMIO or DMA transfers for this slot + * @pe: EEH PE + * @function: EEH option + * + * This routine should be called to reenable frozen MMIO or DMA + * so that it would work correctly again. It's useful while doing + * recovery or log collection on the indicated device. + */ +int eeh_pci_enable(struct eeh_pe *pe, int function) +{ + int active_flag, rc; + + /* + * pHyp doesn't allow to enable IO or DMA on unfrozen PE. + * Also, it's pointless to enable them on unfrozen PE. So + * we have to check before enabling IO or DMA. + */ + switch (function) { + case EEH_OPT_THAW_MMIO: + active_flag = EEH_STATE_MMIO_ACTIVE | EEH_STATE_MMIO_ENABLED; + break; + case EEH_OPT_THAW_DMA: + active_flag = EEH_STATE_DMA_ACTIVE; + break; + case EEH_OPT_DISABLE: + case EEH_OPT_ENABLE: + case EEH_OPT_FREEZE_PE: + active_flag = 0; + break; + default: + pr_warn("%s: Invalid function %d\n", + __func__, function); + return -EINVAL; + } + + /* + * Check if IO or DMA has been enabled before + * enabling them. + */ + if (active_flag) { + rc = eeh_ops->get_state(pe, NULL); + if (rc < 0) + return rc; + + /* Needn't enable it at all */ + if (rc == EEH_STATE_NOT_SUPPORT) + return 0; + + /* It's already enabled */ + if (rc & active_flag) + return 0; + } + + + /* Issue the request */ + rc = eeh_ops->set_option(pe, function); + if (rc) + pr_warn("%s: Unexpected state change %d on " + "PHB#%x-PE#%x, err=%d\n", + __func__, function, pe->phb->global_number, + pe->addr, rc); + + /* Check if the request is finished successfully */ + if (active_flag) { + rc = eeh_wait_state(pe, PCI_BUS_RESET_WAIT_MSEC); + if (rc < 0) + return rc; + + if (rc & active_flag) + return 0; + + return -EIO; + } + + return rc; +} + +static void eeh_disable_and_save_dev_state(struct eeh_dev *edev, + void *userdata) +{ + struct pci_dev *pdev = eeh_dev_to_pci_dev(edev); + struct pci_dev *dev = userdata; + + /* + * The caller should have disabled and saved the + * state for the specified device + */ + if (!pdev || pdev == dev) + return; + + /* Ensure we have D0 power state */ + pci_set_power_state(pdev, PCI_D0); + + /* Save device state */ + pci_save_state(pdev); + + /* + * Disable device to avoid any DMA traffic and + * interrupt from the device + */ + pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE); +} + +static void eeh_restore_dev_state(struct eeh_dev *edev, void *userdata) +{ + struct pci_dev *pdev = eeh_dev_to_pci_dev(edev); + struct pci_dev *dev = userdata; + + if (!pdev) + return; + + /* Apply customization from firmware */ + if (eeh_ops->restore_config) + eeh_ops->restore_config(edev); + + /* The caller should restore state for the specified device */ + if (pdev != dev) + pci_restore_state(pdev); +} + +/** + * pcibios_set_pcie_reset_state - Set PCI-E reset state + * @dev: pci device struct + * @state: reset state to enter + * + * Return value: + * 0 if success + */ +int pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state) +{ + struct eeh_dev *edev = pci_dev_to_eeh_dev(dev); + struct eeh_pe *pe = eeh_dev_to_pe(edev); + + if (!pe) { + pr_err("%s: No PE found on PCI device %s\n", + __func__, pci_name(dev)); + return -EINVAL; + } + + switch (state) { + case pcie_deassert_reset: + eeh_ops->reset(pe, EEH_RESET_DEACTIVATE); + eeh_unfreeze_pe(pe); + if (!(pe->type & EEH_PE_VF)) + eeh_pe_state_clear(pe, EEH_PE_CFG_BLOCKED, true); + eeh_pe_dev_traverse(pe, eeh_restore_dev_state, dev); + eeh_pe_state_clear(pe, EEH_PE_ISOLATED, true); + break; + case pcie_hot_reset: + eeh_pe_mark_isolated(pe); + eeh_pe_state_clear(pe, EEH_PE_CFG_BLOCKED, true); + eeh_ops->set_option(pe, EEH_OPT_FREEZE_PE); + eeh_pe_dev_traverse(pe, eeh_disable_and_save_dev_state, dev); + if (!(pe->type & EEH_PE_VF)) + eeh_pe_state_mark(pe, EEH_PE_CFG_BLOCKED); + eeh_ops->reset(pe, EEH_RESET_HOT); + break; + case pcie_warm_reset: + eeh_pe_mark_isolated(pe); + eeh_pe_state_clear(pe, EEH_PE_CFG_BLOCKED, true); + eeh_ops->set_option(pe, EEH_OPT_FREEZE_PE); + eeh_pe_dev_traverse(pe, eeh_disable_and_save_dev_state, dev); + if (!(pe->type & EEH_PE_VF)) + eeh_pe_state_mark(pe, EEH_PE_CFG_BLOCKED); + eeh_ops->reset(pe, EEH_RESET_FUNDAMENTAL); + break; + default: + eeh_pe_state_clear(pe, EEH_PE_ISOLATED | EEH_PE_CFG_BLOCKED, true); + return -EINVAL; + } + + return 0; +} + +/** + * eeh_set_dev_freset - Check the required reset for the indicated device + * @edev: EEH device + * @flag: return value + * + * Each device might have its preferred reset type: fundamental or + * hot reset. The routine is used to collected the information for + * the indicated device and its children so that the bunch of the + * devices could be reset properly. + */ +static void eeh_set_dev_freset(struct eeh_dev *edev, void *flag) +{ + struct pci_dev *dev; + unsigned int *freset = (unsigned int *)flag; + + dev = eeh_dev_to_pci_dev(edev); + if (dev) + *freset |= dev->needs_freset; +} + +static void eeh_pe_refreeze_passed(struct eeh_pe *root) +{ + struct eeh_pe *pe; + int state; + + eeh_for_each_pe(root, pe) { + if (eeh_pe_passed(pe)) { + state = eeh_ops->get_state(pe, NULL); + if (state & + (EEH_STATE_MMIO_ACTIVE | EEH_STATE_MMIO_ENABLED)) { + pr_info("EEH: Passed-through PE PHB#%x-PE#%x was thawed by reset, re-freezing for safety.\n", + pe->phb->global_number, pe->addr); + eeh_pe_set_option(pe, EEH_OPT_FREEZE_PE); + } + } + } +} + +/** + * eeh_pe_reset_full - Complete a full reset process on the indicated PE + * @pe: EEH PE + * @include_passed: include passed-through devices? + * + * This function executes a full reset procedure on a PE, including setting + * the appropriate flags, performing a fundamental or hot reset, and then + * deactivating the reset status. It is designed to be used within the EEH + * subsystem, as opposed to eeh_pe_reset which is exported to drivers and + * only performs a single operation at a time. + * + * This function will attempt to reset a PE three times before failing. + */ +int eeh_pe_reset_full(struct eeh_pe *pe, bool include_passed) +{ + int reset_state = (EEH_PE_RESET | EEH_PE_CFG_BLOCKED); + int type = EEH_RESET_HOT; + unsigned int freset = 0; + int i, state = 0, ret; + + /* + * Determine the type of reset to perform - hot or fundamental. + * Hot reset is the default operation, unless any device under the + * PE requires a fundamental reset. + */ + eeh_pe_dev_traverse(pe, eeh_set_dev_freset, &freset); + + if (freset) + type = EEH_RESET_FUNDAMENTAL; + + /* Mark the PE as in reset state and block config space accesses */ + eeh_pe_state_mark(pe, reset_state); + + /* Make three attempts at resetting the bus */ + for (i = 0; i < 3; i++) { + ret = eeh_pe_reset(pe, type, include_passed); + if (!ret) + ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE, + include_passed); + if (ret) { + ret = -EIO; + pr_warn("EEH: Failure %d resetting PHB#%x-PE#%x (attempt %d)\n\n", + state, pe->phb->global_number, pe->addr, i + 1); + continue; + } + if (i) + pr_warn("EEH: PHB#%x-PE#%x: Successful reset (attempt %d)\n", + pe->phb->global_number, pe->addr, i + 1); + + /* Wait until the PE is in a functioning state */ + state = eeh_wait_state(pe, PCI_BUS_RESET_WAIT_MSEC); + if (state < 0) { + pr_warn("EEH: Unrecoverable slot failure on PHB#%x-PE#%x", + pe->phb->global_number, pe->addr); + ret = -ENOTRECOVERABLE; + break; + } + if (eeh_state_active(state)) + break; + else + pr_warn("EEH: PHB#%x-PE#%x: Slot inactive after reset: 0x%x (attempt %d)\n", + pe->phb->global_number, pe->addr, state, i + 1); + } + + /* Resetting the PE may have unfrozen child PEs. If those PEs have been + * (potentially) passed through to a guest, re-freeze them: + */ + if (!include_passed) + eeh_pe_refreeze_passed(pe); + + eeh_pe_state_clear(pe, reset_state, true); + return ret; +} + +/** + * eeh_save_bars - Save device bars + * @edev: PCI device associated EEH device + * + * Save the values of the device bars. Unlike the restore + * routine, this routine is *not* recursive. This is because + * PCI devices are added individually; but, for the restore, + * an entire slot is reset at a time. + */ +void eeh_save_bars(struct eeh_dev *edev) +{ + int i; + + if (!edev) + return; + + for (i = 0; i < 16; i++) + eeh_ops->read_config(edev, i * 4, 4, &edev->config_space[i]); + + /* + * For PCI bridges including root port, we need enable bus + * master explicitly. Otherwise, it can't fetch IODA table + * entries correctly. So we cache the bit in advance so that + * we can restore it after reset, either PHB range or PE range. + */ + if (edev->mode & EEH_DEV_BRIDGE) + edev->config_space[1] |= PCI_COMMAND_MASTER; +} + +static int eeh_reboot_notifier(struct notifier_block *nb, + unsigned long action, void *unused) +{ + eeh_clear_flag(EEH_ENABLED); + return NOTIFY_DONE; +} + +static struct notifier_block eeh_reboot_nb = { + .notifier_call = eeh_reboot_notifier, +}; + +static int eeh_device_notifier(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct device *dev = data; + + switch (action) { + /* + * Note: It's not possible to perform EEH device addition (i.e. + * {pseries,pnv}_pcibios_bus_add_device()) here because it depends on + * the device's resources, which have not yet been set up. + */ + case BUS_NOTIFY_DEL_DEVICE: + eeh_remove_device(to_pci_dev(dev)); + break; + default: + break; + } + return NOTIFY_DONE; +} + +static struct notifier_block eeh_device_nb = { + .notifier_call = eeh_device_notifier, +}; + +/** + * eeh_init - System wide EEH initialization + * @ops: struct to trace EEH operation callback functions + * + * It's the platform's job to call this from an arch_initcall(). + */ +int eeh_init(struct eeh_ops *ops) +{ + struct pci_controller *hose, *tmp; + int ret = 0; + + /* the platform should only initialise EEH once */ + if (WARN_ON(eeh_ops)) + return -EEXIST; + if (WARN_ON(!ops)) + return -ENOENT; + eeh_ops = ops; + + /* Register reboot notifier */ + ret = register_reboot_notifier(&eeh_reboot_nb); + if (ret) { + pr_warn("%s: Failed to register reboot notifier (%d)\n", + __func__, ret); + return ret; + } + + ret = bus_register_notifier(&pci_bus_type, &eeh_device_nb); + if (ret) { + pr_warn("%s: Failed to register bus notifier (%d)\n", + __func__, ret); + return ret; + } + + /* Initialize PHB PEs */ + list_for_each_entry_safe(hose, tmp, &hose_list, list_node) + eeh_phb_pe_create(hose); + + eeh_addr_cache_init(); + + /* Initialize EEH event */ + return eeh_event_init(); +} + +/** + * eeh_probe_device() - Perform EEH initialization for the indicated pci device + * @dev: pci device for which to set up EEH + * + * This routine must be used to complete EEH initialization for PCI + * devices that were added after system boot (e.g. hotplug, dlpar). + */ +void eeh_probe_device(struct pci_dev *dev) +{ + struct eeh_dev *edev; + + pr_debug("EEH: Adding device %s\n", pci_name(dev)); + + /* + * pci_dev_to_eeh_dev() can only work if eeh_probe_dev() was + * already called for this device. + */ + if (WARN_ON_ONCE(pci_dev_to_eeh_dev(dev))) { + pci_dbg(dev, "Already bound to an eeh_dev!\n"); + return; + } + + edev = eeh_ops->probe(dev); + if (!edev) { + pr_debug("EEH: Adding device failed\n"); + return; + } + + /* + * FIXME: We rely on pcibios_release_device() to remove the + * existing EEH state. The release function is only called if + * the pci_dev's refcount drops to zero so if something is + * keeping a ref to a device (e.g. a filesystem) we need to + * remove the old EEH state. + * + * FIXME: HEY MA, LOOK AT ME, NO LOCKING! + */ + if (edev->pdev && edev->pdev != dev) { + eeh_pe_tree_remove(edev); + eeh_addr_cache_rmv_dev(edev->pdev); + eeh_sysfs_remove_device(edev->pdev); + + /* + * We definitely should have the PCI device removed + * though it wasn't correctly. So we needn't call + * into error handler afterwards. + */ + edev->mode |= EEH_DEV_NO_HANDLER; + } + + /* bind the pdev and the edev together */ + edev->pdev = dev; + dev->dev.archdata.edev = edev; + eeh_addr_cache_insert_dev(dev); + eeh_sysfs_add_device(dev); +} + +/** + * eeh_remove_device - Undo EEH setup for the indicated pci device + * @dev: pci device to be removed + * + * This routine should be called when a device is removed from + * a running system (e.g. by hotplug or dlpar). It unregisters + * the PCI device from the EEH subsystem. I/O errors affecting + * this device will no longer be detected after this call; thus, + * i/o errors affecting this slot may leave this device unusable. + */ +void eeh_remove_device(struct pci_dev *dev) +{ + struct eeh_dev *edev; + + if (!dev || !eeh_enabled()) + return; + edev = pci_dev_to_eeh_dev(dev); + + /* Unregister the device with the EEH/PCI address search system */ + dev_dbg(&dev->dev, "EEH: Removing device\n"); + + if (!edev || !edev->pdev || !edev->pe) { + dev_dbg(&dev->dev, "EEH: Device not referenced!\n"); + return; + } + + /* + * During the hotplug for EEH error recovery, we need the EEH + * device attached to the parent PE in order for BAR restore + * a bit later. So we keep it for BAR restore and remove it + * from the parent PE during the BAR resotre. + */ + edev->pdev = NULL; + + /* + * eeh_sysfs_remove_device() uses pci_dev_to_eeh_dev() so we need to + * remove the sysfs files before clearing dev.archdata.edev + */ + if (edev->mode & EEH_DEV_SYSFS) + eeh_sysfs_remove_device(dev); + + /* + * We're removing from the PCI subsystem, that means + * the PCI device driver can't support EEH or not + * well. So we rely on hotplug completely to do recovery + * for the specific PCI device. + */ + edev->mode |= EEH_DEV_NO_HANDLER; + + eeh_addr_cache_rmv_dev(dev); + + /* + * The flag "in_error" is used to trace EEH devices for VFs + * in error state or not. It's set in eeh_report_error(). If + * it's not set, eeh_report_{reset,resume}() won't be called + * for the VF EEH device. + */ + edev->in_error = false; + dev->dev.archdata.edev = NULL; + if (!(edev->pe->state & EEH_PE_KEEP)) + eeh_pe_tree_remove(edev); + else + edev->mode |= EEH_DEV_DISCONNECTED; +} + +int eeh_unfreeze_pe(struct eeh_pe *pe) +{ + int ret; + + ret = eeh_pci_enable(pe, EEH_OPT_THAW_MMIO); + if (ret) { + pr_warn("%s: Failure %d enabling IO on PHB#%x-PE#%x\n", + __func__, ret, pe->phb->global_number, pe->addr); + return ret; + } + + ret = eeh_pci_enable(pe, EEH_OPT_THAW_DMA); + if (ret) { + pr_warn("%s: Failure %d enabling DMA on PHB#%x-PE#%x\n", + __func__, ret, pe->phb->global_number, pe->addr); + return ret; + } + + return ret; +} + + +static struct pci_device_id eeh_reset_ids[] = { + { PCI_DEVICE(0x19a2, 0x0710) }, /* Emulex, BE */ + { PCI_DEVICE(0x10df, 0xe220) }, /* Emulex, Lancer */ + { PCI_DEVICE(0x14e4, 0x1657) }, /* Broadcom BCM5719 */ + { 0 } +}; + +static int eeh_pe_change_owner(struct eeh_pe *pe) +{ + struct eeh_dev *edev, *tmp; + struct pci_dev *pdev; + struct pci_device_id *id; + int ret; + + /* Check PE state */ + ret = eeh_ops->get_state(pe, NULL); + if (ret < 0 || ret == EEH_STATE_NOT_SUPPORT) + return 0; + + /* Unfrozen PE, nothing to do */ + if (eeh_state_active(ret)) + return 0; + + /* Frozen PE, check if it needs PE level reset */ + eeh_pe_for_each_dev(pe, edev, tmp) { + pdev = eeh_dev_to_pci_dev(edev); + if (!pdev) + continue; + + for (id = &eeh_reset_ids[0]; id->vendor != 0; id++) { + if (id->vendor != PCI_ANY_ID && + id->vendor != pdev->vendor) + continue; + if (id->device != PCI_ANY_ID && + id->device != pdev->device) + continue; + if (id->subvendor != PCI_ANY_ID && + id->subvendor != pdev->subsystem_vendor) + continue; + if (id->subdevice != PCI_ANY_ID && + id->subdevice != pdev->subsystem_device) + continue; + + return eeh_pe_reset_and_recover(pe); + } + } + + ret = eeh_unfreeze_pe(pe); + if (!ret) + eeh_pe_state_clear(pe, EEH_PE_ISOLATED, true); + return ret; +} + +/** + * eeh_dev_open - Increase count of pass through devices for PE + * @pdev: PCI device + * + * Increase count of passed through devices for the indicated + * PE. In the result, the EEH errors detected on the PE won't be + * reported. The PE owner will be responsible for detection + * and recovery. + */ +int eeh_dev_open(struct pci_dev *pdev) +{ + struct eeh_dev *edev; + int ret = -ENODEV; + + mutex_lock(&eeh_dev_mutex); + + /* No PCI device ? */ + if (!pdev) + goto out; + + /* No EEH device or PE ? */ + edev = pci_dev_to_eeh_dev(pdev); + if (!edev || !edev->pe) + goto out; + + /* + * The PE might have been put into frozen state, but we + * didn't detect that yet. The passed through PCI devices + * in frozen PE won't work properly. Clear the frozen state + * in advance. + */ + ret = eeh_pe_change_owner(edev->pe); + if (ret) + goto out; + + /* Increase PE's pass through count */ + atomic_inc(&edev->pe->pass_dev_cnt); + mutex_unlock(&eeh_dev_mutex); + + return 0; +out: + mutex_unlock(&eeh_dev_mutex); + return ret; +} +EXPORT_SYMBOL_GPL(eeh_dev_open); + +/** + * eeh_dev_release - Decrease count of pass through devices for PE + * @pdev: PCI device + * + * Decrease count of pass through devices for the indicated PE. If + * there is no passed through device in PE, the EEH errors detected + * on the PE will be reported and handled as usual. + */ +void eeh_dev_release(struct pci_dev *pdev) +{ + struct eeh_dev *edev; + + mutex_lock(&eeh_dev_mutex); + + /* No PCI device ? */ + if (!pdev) + goto out; + + /* No EEH device ? */ + edev = pci_dev_to_eeh_dev(pdev); + if (!edev || !edev->pe || !eeh_pe_passed(edev->pe)) + goto out; + + /* Decrease PE's pass through count */ + WARN_ON(atomic_dec_if_positive(&edev->pe->pass_dev_cnt) < 0); + eeh_pe_change_owner(edev->pe); +out: + mutex_unlock(&eeh_dev_mutex); +} +EXPORT_SYMBOL(eeh_dev_release); + +#ifdef CONFIG_IOMMU_API + +static int dev_has_iommu_table(struct device *dev, void *data) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct pci_dev **ppdev = data; + + if (!dev) + return 0; + + if (device_iommu_mapped(dev)) { + *ppdev = pdev; + return 1; + } + + return 0; +} + +/** + * eeh_iommu_group_to_pe - Convert IOMMU group to EEH PE + * @group: IOMMU group + * + * The routine is called to convert IOMMU group to EEH PE. + */ +struct eeh_pe *eeh_iommu_group_to_pe(struct iommu_group *group) +{ + struct pci_dev *pdev = NULL; + struct eeh_dev *edev; + int ret; + + /* No IOMMU group ? */ + if (!group) + return NULL; + + ret = iommu_group_for_each_dev(group, &pdev, dev_has_iommu_table); + if (!ret || !pdev) + return NULL; + + /* No EEH device or PE ? */ + edev = pci_dev_to_eeh_dev(pdev); + if (!edev || !edev->pe) + return NULL; + + return edev->pe; +} +EXPORT_SYMBOL_GPL(eeh_iommu_group_to_pe); + +#endif /* CONFIG_IOMMU_API */ + +/** + * eeh_pe_set_option - Set options for the indicated PE + * @pe: EEH PE + * @option: requested option + * + * The routine is called to enable or disable EEH functionality + * on the indicated PE, to enable IO or DMA for the frozen PE. + */ +int eeh_pe_set_option(struct eeh_pe *pe, int option) +{ + int ret = 0; + + /* Invalid PE ? */ + if (!pe) + return -ENODEV; + + /* + * EEH functionality could possibly be disabled, just + * return error for the case. And the EEH functionality + * isn't expected to be disabled on one specific PE. + */ + switch (option) { + case EEH_OPT_ENABLE: + if (eeh_enabled()) { + ret = eeh_pe_change_owner(pe); + break; + } + ret = -EIO; + break; + case EEH_OPT_DISABLE: + break; + case EEH_OPT_THAW_MMIO: + case EEH_OPT_THAW_DMA: + case EEH_OPT_FREEZE_PE: + if (!eeh_ops || !eeh_ops->set_option) { + ret = -ENOENT; + break; + } + + ret = eeh_pci_enable(pe, option); + break; + default: + pr_debug("%s: Option %d out of range (%d, %d)\n", + __func__, option, EEH_OPT_DISABLE, EEH_OPT_THAW_DMA); + ret = -EINVAL; + } + + return ret; +} +EXPORT_SYMBOL_GPL(eeh_pe_set_option); + +/** + * eeh_pe_get_state - Retrieve PE's state + * @pe: EEH PE + * + * Retrieve the PE's state, which includes 3 aspects: enabled + * DMA, enabled IO and asserted reset. + */ +int eeh_pe_get_state(struct eeh_pe *pe) +{ + int result, ret = 0; + bool rst_active, dma_en, mmio_en; + + /* Existing PE ? */ + if (!pe) + return -ENODEV; + + if (!eeh_ops || !eeh_ops->get_state) + return -ENOENT; + + /* + * If the parent PE is owned by the host kernel and is undergoing + * error recovery, we should return the PE state as temporarily + * unavailable so that the error recovery on the guest is suspended + * until the recovery completes on the host. + */ + if (pe->parent && + !(pe->state & EEH_PE_REMOVED) && + (pe->parent->state & (EEH_PE_ISOLATED | EEH_PE_RECOVERING))) + return EEH_PE_STATE_UNAVAIL; + + result = eeh_ops->get_state(pe, NULL); + rst_active = !!(result & EEH_STATE_RESET_ACTIVE); + dma_en = !!(result & EEH_STATE_DMA_ENABLED); + mmio_en = !!(result & EEH_STATE_MMIO_ENABLED); + + if (rst_active) + ret = EEH_PE_STATE_RESET; + else if (dma_en && mmio_en) + ret = EEH_PE_STATE_NORMAL; + else if (!dma_en && !mmio_en) + ret = EEH_PE_STATE_STOPPED_IO_DMA; + else if (!dma_en && mmio_en) + ret = EEH_PE_STATE_STOPPED_DMA; + else + ret = EEH_PE_STATE_UNAVAIL; + + return ret; +} +EXPORT_SYMBOL_GPL(eeh_pe_get_state); + +static int eeh_pe_reenable_devices(struct eeh_pe *pe, bool include_passed) +{ + struct eeh_dev *edev, *tmp; + struct pci_dev *pdev; + int ret = 0; + + eeh_pe_restore_bars(pe); + + /* + * Reenable PCI devices as the devices passed + * through are always enabled before the reset. + */ + eeh_pe_for_each_dev(pe, edev, tmp) { + pdev = eeh_dev_to_pci_dev(edev); + if (!pdev) + continue; + + ret = pci_reenable_device(pdev); + if (ret) { + pr_warn("%s: Failure %d reenabling %s\n", + __func__, ret, pci_name(pdev)); + return ret; + } + } + + /* The PE is still in frozen state */ + if (include_passed || !eeh_pe_passed(pe)) { + ret = eeh_unfreeze_pe(pe); + } else + pr_info("EEH: Note: Leaving passthrough PHB#%x-PE#%x frozen.\n", + pe->phb->global_number, pe->addr); + if (!ret) + eeh_pe_state_clear(pe, EEH_PE_ISOLATED, include_passed); + return ret; +} + + +/** + * eeh_pe_reset - Issue PE reset according to specified type + * @pe: EEH PE + * @option: reset type + * @include_passed: include passed-through devices? + * + * The routine is called to reset the specified PE with the + * indicated type, either fundamental reset or hot reset. + * PE reset is the most important part for error recovery. + */ +int eeh_pe_reset(struct eeh_pe *pe, int option, bool include_passed) +{ + int ret = 0; + + /* Invalid PE ? */ + if (!pe) + return -ENODEV; + + if (!eeh_ops || !eeh_ops->set_option || !eeh_ops->reset) + return -ENOENT; + + switch (option) { + case EEH_RESET_DEACTIVATE: + ret = eeh_ops->reset(pe, option); + eeh_pe_state_clear(pe, EEH_PE_CFG_BLOCKED, include_passed); + if (ret) + break; + + ret = eeh_pe_reenable_devices(pe, include_passed); + break; + case EEH_RESET_HOT: + case EEH_RESET_FUNDAMENTAL: + /* + * Proactively freeze the PE to drop all MMIO access + * during reset, which should be banned as it's always + * cause recursive EEH error. + */ + eeh_ops->set_option(pe, EEH_OPT_FREEZE_PE); + + eeh_pe_state_mark(pe, EEH_PE_CFG_BLOCKED); + ret = eeh_ops->reset(pe, option); + break; + default: + pr_debug("%s: Unsupported option %d\n", + __func__, option); + ret = -EINVAL; + } + + return ret; +} +EXPORT_SYMBOL_GPL(eeh_pe_reset); + +/** + * eeh_pe_configure - Configure PCI bridges after PE reset + * @pe: EEH PE + * + * The routine is called to restore the PCI config space for + * those PCI devices, especially PCI bridges affected by PE + * reset issued previously. + */ +int eeh_pe_configure(struct eeh_pe *pe) +{ + int ret = 0; + + /* Invalid PE ? */ + if (!pe) + return -ENODEV; + + return ret; +} +EXPORT_SYMBOL_GPL(eeh_pe_configure); + +/** + * eeh_pe_inject_err - Injecting the specified PCI error to the indicated PE + * @pe: the indicated PE + * @type: error type + * @func: error function + * @addr: address + * @mask: address mask + * + * The routine is called to inject the specified PCI error, which + * is determined by @type and @func, to the indicated PE for + * testing purpose. + */ +int eeh_pe_inject_err(struct eeh_pe *pe, int type, int func, + unsigned long addr, unsigned long mask) +{ + /* Invalid PE ? */ + if (!pe) + return -ENODEV; + + /* Unsupported operation ? */ + if (!eeh_ops || !eeh_ops->err_inject) + return -ENOENT; + + /* Check on PCI error type */ + if (type != EEH_ERR_TYPE_32 && type != EEH_ERR_TYPE_64) + return -EINVAL; + + /* Check on PCI error function */ + if (func < EEH_ERR_FUNC_MIN || func > EEH_ERR_FUNC_MAX) + return -EINVAL; + + return eeh_ops->err_inject(pe, type, func, addr, mask); +} +EXPORT_SYMBOL_GPL(eeh_pe_inject_err); + +#ifdef CONFIG_PROC_FS +static int proc_eeh_show(struct seq_file *m, void *v) +{ + if (!eeh_enabled()) { + seq_printf(m, "EEH Subsystem is globally disabled\n"); + seq_printf(m, "eeh_total_mmio_ffs=%llu\n", eeh_stats.total_mmio_ffs); + } else { + seq_printf(m, "EEH Subsystem is enabled\n"); + seq_printf(m, + "no device=%llu\n" + "no device node=%llu\n" + "no config address=%llu\n" + "check not wanted=%llu\n" + "eeh_total_mmio_ffs=%llu\n" + "eeh_false_positives=%llu\n" + "eeh_slot_resets=%llu\n", + eeh_stats.no_device, + eeh_stats.no_dn, + eeh_stats.no_cfg_addr, + eeh_stats.ignored_check, + eeh_stats.total_mmio_ffs, + eeh_stats.false_positives, + eeh_stats.slot_resets); + } + + return 0; +} +#endif /* CONFIG_PROC_FS */ + +#ifdef CONFIG_DEBUG_FS + + +static struct pci_dev *eeh_debug_lookup_pdev(struct file *filp, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + uint32_t domain, bus, dev, fn; + struct pci_dev *pdev; + char buf[20]; + int ret; + + memset(buf, 0, sizeof(buf)); + ret = simple_write_to_buffer(buf, sizeof(buf)-1, ppos, user_buf, count); + if (!ret) + return ERR_PTR(-EFAULT); + + ret = sscanf(buf, "%x:%x:%x.%x", &domain, &bus, &dev, &fn); + if (ret != 4) { + pr_err("%s: expected 4 args, got %d\n", __func__, ret); + return ERR_PTR(-EINVAL); + } + + pdev = pci_get_domain_bus_and_slot(domain, bus, (dev << 3) | fn); + if (!pdev) + return ERR_PTR(-ENODEV); + + return pdev; +} + +static int eeh_enable_dbgfs_set(void *data, u64 val) +{ + if (val) + eeh_clear_flag(EEH_FORCE_DISABLED); + else + eeh_add_flag(EEH_FORCE_DISABLED); + + return 0; +} + +static int eeh_enable_dbgfs_get(void *data, u64 *val) +{ + if (eeh_enabled()) + *val = 0x1ul; + else + *val = 0x0ul; + return 0; +} + +DEFINE_DEBUGFS_ATTRIBUTE(eeh_enable_dbgfs_ops, eeh_enable_dbgfs_get, + eeh_enable_dbgfs_set, "0x%llx\n"); + +static ssize_t eeh_force_recover_write(struct file *filp, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct pci_controller *hose; + uint32_t phbid, pe_no; + struct eeh_pe *pe; + char buf[20]; + int ret; + + ret = simple_write_to_buffer(buf, sizeof(buf), ppos, user_buf, count); + if (!ret) + return -EFAULT; + + /* + * When PE is NULL the event is a "special" event. Rather than + * recovering a specific PE it forces the EEH core to scan for failed + * PHBs and recovers each. This needs to be done before any device + * recoveries can occur. + */ + if (!strncmp(buf, "hwcheck", 7)) { + __eeh_send_failure_event(NULL); + return count; + } + + ret = sscanf(buf, "%x:%x", &phbid, &pe_no); + if (ret != 2) + return -EINVAL; + + hose = pci_find_controller_for_domain(phbid); + if (!hose) + return -ENODEV; + + /* Retrieve PE */ + pe = eeh_pe_get(hose, pe_no); + if (!pe) + return -ENODEV; + + /* + * We don't do any state checking here since the detection + * process is async to the recovery process. The recovery + * thread *should* not break even if we schedule a recovery + * from an odd state (e.g. PE removed, or recovery of a + * non-isolated PE) + */ + __eeh_send_failure_event(pe); + + return ret < 0 ? ret : count; +} + +static const struct file_operations eeh_force_recover_fops = { + .open = simple_open, + .llseek = no_llseek, + .write = eeh_force_recover_write, +}; + +static ssize_t eeh_debugfs_dev_usage(struct file *filp, + char __user *user_buf, + size_t count, loff_t *ppos) +{ + static const char usage[] = "input format: <domain>:<bus>:<dev>.<fn>\n"; + + return simple_read_from_buffer(user_buf, count, ppos, + usage, sizeof(usage) - 1); +} + +static ssize_t eeh_dev_check_write(struct file *filp, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct pci_dev *pdev; + struct eeh_dev *edev; + int ret; + + pdev = eeh_debug_lookup_pdev(filp, user_buf, count, ppos); + if (IS_ERR(pdev)) + return PTR_ERR(pdev); + + edev = pci_dev_to_eeh_dev(pdev); + if (!edev) { + pci_err(pdev, "No eeh_dev for this device!\n"); + pci_dev_put(pdev); + return -ENODEV; + } + + ret = eeh_dev_check_failure(edev); + pci_info(pdev, "eeh_dev_check_failure(%s) = %d\n", + pci_name(pdev), ret); + + pci_dev_put(pdev); + + return count; +} + +static const struct file_operations eeh_dev_check_fops = { + .open = simple_open, + .llseek = no_llseek, + .write = eeh_dev_check_write, + .read = eeh_debugfs_dev_usage, +}; + +static int eeh_debugfs_break_device(struct pci_dev *pdev) +{ + struct resource *bar = NULL; + void __iomem *mapped; + u16 old, bit; + int i, pos; + + /* Do we have an MMIO BAR to disable? */ + for (i = 0; i <= PCI_STD_RESOURCE_END; i++) { + struct resource *r = &pdev->resource[i]; + + if (!r->flags || !r->start) + continue; + if (r->flags & IORESOURCE_IO) + continue; + if (r->flags & IORESOURCE_UNSET) + continue; + + bar = r; + break; + } + + if (!bar) { + pci_err(pdev, "Unable to find Memory BAR to cause EEH with\n"); + return -ENXIO; + } + + pci_err(pdev, "Going to break: %pR\n", bar); + + if (pdev->is_virtfn) { +#ifndef CONFIG_PCI_IOV + return -ENXIO; +#else + /* + * VFs don't have a per-function COMMAND register, so the best + * we can do is clear the Memory Space Enable bit in the PF's + * SRIOV control reg. + * + * Unfortunately, this requires that we have a PF (i.e doesn't + * work for a passed-through VF) and it has the potential side + * effect of also causing an EEH on every other VF under the + * PF. Oh well. + */ + pdev = pdev->physfn; + if (!pdev) + return -ENXIO; /* passed through VFs have no PF */ + + pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV); + pos += PCI_SRIOV_CTRL; + bit = PCI_SRIOV_CTRL_MSE; +#endif /* !CONFIG_PCI_IOV */ + } else { + bit = PCI_COMMAND_MEMORY; + pos = PCI_COMMAND; + } + + /* + * Process here is: + * + * 1. Disable Memory space. + * + * 2. Perform an MMIO to the device. This should result in an error + * (CA / UR) being raised by the device which results in an EEH + * PE freeze. Using the in_8() accessor skips the eeh detection hook + * so the freeze hook so the EEH Detection machinery won't be + * triggered here. This is to match the usual behaviour of EEH + * where the HW will asynchronously freeze a PE and it's up to + * the kernel to notice and deal with it. + * + * 3. Turn Memory space back on. This is more important for VFs + * since recovery will probably fail if we don't. For normal + * the COMMAND register is reset as a part of re-initialising + * the device. + * + * Breaking stuff is the point so who cares if it's racy ;) + */ + pci_read_config_word(pdev, pos, &old); + + mapped = ioremap(bar->start, PAGE_SIZE); + if (!mapped) { + pci_err(pdev, "Unable to map MMIO BAR %pR\n", bar); + return -ENXIO; + } + + pci_write_config_word(pdev, pos, old & ~bit); + in_8(mapped); + pci_write_config_word(pdev, pos, old); + + iounmap(mapped); + + return 0; +} + +static ssize_t eeh_dev_break_write(struct file *filp, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct pci_dev *pdev; + int ret; + + pdev = eeh_debug_lookup_pdev(filp, user_buf, count, ppos); + if (IS_ERR(pdev)) + return PTR_ERR(pdev); + + ret = eeh_debugfs_break_device(pdev); + pci_dev_put(pdev); + + if (ret < 0) + return ret; + + return count; +} + +static const struct file_operations eeh_dev_break_fops = { + .open = simple_open, + .llseek = no_llseek, + .write = eeh_dev_break_write, + .read = eeh_debugfs_dev_usage, +}; + +static ssize_t eeh_dev_can_recover(struct file *filp, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct pci_driver *drv; + struct pci_dev *pdev; + size_t ret; + + pdev = eeh_debug_lookup_pdev(filp, user_buf, count, ppos); + if (IS_ERR(pdev)) + return PTR_ERR(pdev); + + /* + * In order for error recovery to work the driver needs to implement + * .error_detected(), so it can quiesce IO to the device, and + * .slot_reset() so it can re-initialise the device after a reset. + * + * Ideally they'd implement .resume() too, but some drivers which + * we need to support (notably IPR) don't so I guess we can tolerate + * that. + * + * .mmio_enabled() is mostly there as a work-around for devices which + * take forever to re-init after a hot reset. Implementing that is + * strictly optional. + */ + drv = pci_dev_driver(pdev); + if (drv && + drv->err_handler && + drv->err_handler->error_detected && + drv->err_handler->slot_reset) { + ret = count; + } else { + ret = -EOPNOTSUPP; + } + + pci_dev_put(pdev); + + return ret; +} + +static const struct file_operations eeh_dev_can_recover_fops = { + .open = simple_open, + .llseek = no_llseek, + .write = eeh_dev_can_recover, + .read = eeh_debugfs_dev_usage, +}; + +#endif + +static int __init eeh_init_proc(void) +{ + if (machine_is(pseries) || machine_is(powernv)) { + proc_create_single("powerpc/eeh", 0, NULL, proc_eeh_show); +#ifdef CONFIG_DEBUG_FS + debugfs_create_file_unsafe("eeh_enable", 0600, + arch_debugfs_dir, NULL, + &eeh_enable_dbgfs_ops); + debugfs_create_u32("eeh_max_freezes", 0600, + arch_debugfs_dir, &eeh_max_freezes); + debugfs_create_bool("eeh_disable_recovery", 0600, + arch_debugfs_dir, + &eeh_debugfs_no_recover); + debugfs_create_file_unsafe("eeh_dev_check", 0600, + arch_debugfs_dir, NULL, + &eeh_dev_check_fops); + debugfs_create_file_unsafe("eeh_dev_break", 0600, + arch_debugfs_dir, NULL, + &eeh_dev_break_fops); + debugfs_create_file_unsafe("eeh_force_recover", 0600, + arch_debugfs_dir, NULL, + &eeh_force_recover_fops); + debugfs_create_file_unsafe("eeh_dev_can_recover", 0600, + arch_debugfs_dir, NULL, + &eeh_dev_can_recover_fops); + eeh_cache_debugfs_init(); +#endif + } + + return 0; +} +__initcall(eeh_init_proc); diff --git a/arch/powerpc/kernel/eeh_cache.c b/arch/powerpc/kernel/eeh_cache.c new file mode 100644 index 000000000..2f9dbf8ad --- /dev/null +++ b/arch/powerpc/kernel/eeh_cache.c @@ -0,0 +1,288 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * PCI address cache; allows the lookup of PCI devices based on I/O address + * + * Copyright IBM Corporation 2004 + * Copyright Linas Vepstas <linas@austin.ibm.com> 2004 + */ + +#include <linux/list.h> +#include <linux/pci.h> +#include <linux/rbtree.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/atomic.h> +#include <linux/debugfs.h> +#include <asm/pci-bridge.h> +#include <asm/ppc-pci.h> + + +/** + * DOC: Overview + * + * The pci address cache subsystem. This subsystem places + * PCI device address resources into a red-black tree, sorted + * according to the address range, so that given only an i/o + * address, the corresponding PCI device can be **quickly** + * found. It is safe to perform an address lookup in an interrupt + * context; this ability is an important feature. + * + * Currently, the only customer of this code is the EEH subsystem; + * thus, this code has been somewhat tailored to suit EEH better. + * In particular, the cache does *not* hold the addresses of devices + * for which EEH is not enabled. + * + * (Implementation Note: The RB tree seems to be better/faster + * than any hash algo I could think of for this problem, even + * with the penalty of slow pointer chases for d-cache misses). + */ + +struct pci_io_addr_range { + struct rb_node rb_node; + resource_size_t addr_lo; + resource_size_t addr_hi; + struct eeh_dev *edev; + struct pci_dev *pcidev; + unsigned long flags; +}; + +static struct pci_io_addr_cache { + struct rb_root rb_root; + spinlock_t piar_lock; +} pci_io_addr_cache_root; + +static inline struct eeh_dev *__eeh_addr_cache_get_device(unsigned long addr) +{ + struct rb_node *n = pci_io_addr_cache_root.rb_root.rb_node; + + while (n) { + struct pci_io_addr_range *piar; + piar = rb_entry(n, struct pci_io_addr_range, rb_node); + + if (addr < piar->addr_lo) + n = n->rb_left; + else if (addr > piar->addr_hi) + n = n->rb_right; + else + return piar->edev; + } + + return NULL; +} + +/** + * eeh_addr_cache_get_dev - Get device, given only address + * @addr: mmio (PIO) phys address or i/o port number + * + * Given an mmio phys address, or a port number, find a pci device + * that implements this address. I/O port numbers are assumed to be offset + * from zero (that is, they do *not* have pci_io_addr added in). + * It is safe to call this function within an interrupt. + */ +struct eeh_dev *eeh_addr_cache_get_dev(unsigned long addr) +{ + struct eeh_dev *edev; + unsigned long flags; + + spin_lock_irqsave(&pci_io_addr_cache_root.piar_lock, flags); + edev = __eeh_addr_cache_get_device(addr); + spin_unlock_irqrestore(&pci_io_addr_cache_root.piar_lock, flags); + return edev; +} + +#ifdef DEBUG +/* + * Handy-dandy debug print routine, does nothing more + * than print out the contents of our addr cache. + */ +static void eeh_addr_cache_print(struct pci_io_addr_cache *cache) +{ + struct rb_node *n; + int cnt = 0; + + n = rb_first(&cache->rb_root); + while (n) { + struct pci_io_addr_range *piar; + piar = rb_entry(n, struct pci_io_addr_range, rb_node); + pr_info("PCI: %s addr range %d [%pap-%pap]: %s\n", + (piar->flags & IORESOURCE_IO) ? "i/o" : "mem", cnt, + &piar->addr_lo, &piar->addr_hi, pci_name(piar->pcidev)); + cnt++; + n = rb_next(n); + } +} +#endif + +/* Insert address range into the rb tree. */ +static struct pci_io_addr_range * +eeh_addr_cache_insert(struct pci_dev *dev, resource_size_t alo, + resource_size_t ahi, unsigned long flags) +{ + struct rb_node **p = &pci_io_addr_cache_root.rb_root.rb_node; + struct rb_node *parent = NULL; + struct pci_io_addr_range *piar; + + /* Walk tree, find a place to insert into tree */ + while (*p) { + parent = *p; + piar = rb_entry(parent, struct pci_io_addr_range, rb_node); + if (ahi < piar->addr_lo) { + p = &parent->rb_left; + } else if (alo > piar->addr_hi) { + p = &parent->rb_right; + } else { + if (dev != piar->pcidev || + alo != piar->addr_lo || ahi != piar->addr_hi) { + pr_warn("PIAR: overlapping address range\n"); + } + return piar; + } + } + piar = kzalloc(sizeof(struct pci_io_addr_range), GFP_ATOMIC); + if (!piar) + return NULL; + + piar->addr_lo = alo; + piar->addr_hi = ahi; + piar->edev = pci_dev_to_eeh_dev(dev); + piar->pcidev = dev; + piar->flags = flags; + + eeh_edev_dbg(piar->edev, "PIAR: insert range=[%pap:%pap]\n", + &alo, &ahi); + + rb_link_node(&piar->rb_node, parent, p); + rb_insert_color(&piar->rb_node, &pci_io_addr_cache_root.rb_root); + + return piar; +} + +static void __eeh_addr_cache_insert_dev(struct pci_dev *dev) +{ + struct eeh_dev *edev; + int i; + + edev = pci_dev_to_eeh_dev(dev); + if (!edev) { + pr_warn("PCI: no EEH dev found for %s\n", + pci_name(dev)); + return; + } + + /* Skip any devices for which EEH is not enabled. */ + if (!edev->pe) { + dev_dbg(&dev->dev, "EEH: Skip building address cache\n"); + return; + } + + /* + * Walk resources on this device, poke the first 7 (6 normal BAR and 1 + * ROM BAR) into the tree. + */ + for (i = 0; i <= PCI_ROM_RESOURCE; i++) { + resource_size_t start = pci_resource_start(dev,i); + resource_size_t end = pci_resource_end(dev,i); + unsigned long flags = pci_resource_flags(dev,i); + + /* We are interested only bus addresses, not dma or other stuff */ + if (0 == (flags & (IORESOURCE_IO | IORESOURCE_MEM))) + continue; + if (start == 0 || ~start == 0 || end == 0 || ~end == 0) + continue; + eeh_addr_cache_insert(dev, start, end, flags); + } +} + +/** + * eeh_addr_cache_insert_dev - Add a device to the address cache + * @dev: PCI device whose I/O addresses we are interested in. + * + * In order to support the fast lookup of devices based on addresses, + * we maintain a cache of devices that can be quickly searched. + * This routine adds a device to that cache. + */ +void eeh_addr_cache_insert_dev(struct pci_dev *dev) +{ + unsigned long flags; + + spin_lock_irqsave(&pci_io_addr_cache_root.piar_lock, flags); + __eeh_addr_cache_insert_dev(dev); + spin_unlock_irqrestore(&pci_io_addr_cache_root.piar_lock, flags); +} + +static inline void __eeh_addr_cache_rmv_dev(struct pci_dev *dev) +{ + struct rb_node *n; + +restart: + n = rb_first(&pci_io_addr_cache_root.rb_root); + while (n) { + struct pci_io_addr_range *piar; + piar = rb_entry(n, struct pci_io_addr_range, rb_node); + + if (piar->pcidev == dev) { + eeh_edev_dbg(piar->edev, "PIAR: remove range=[%pap:%pap]\n", + &piar->addr_lo, &piar->addr_hi); + rb_erase(n, &pci_io_addr_cache_root.rb_root); + kfree(piar); + goto restart; + } + n = rb_next(n); + } +} + +/** + * eeh_addr_cache_rmv_dev - remove pci device from addr cache + * @dev: device to remove + * + * Remove a device from the addr-cache tree. + * This is potentially expensive, since it will walk + * the tree multiple times (once per resource). + * But so what; device removal doesn't need to be that fast. + */ +void eeh_addr_cache_rmv_dev(struct pci_dev *dev) +{ + unsigned long flags; + + spin_lock_irqsave(&pci_io_addr_cache_root.piar_lock, flags); + __eeh_addr_cache_rmv_dev(dev); + spin_unlock_irqrestore(&pci_io_addr_cache_root.piar_lock, flags); +} + +/** + * eeh_addr_cache_init - Initialize a cache of I/O addresses + * + * Initialize a cache of pci i/o addresses. This cache will be used to + * find the pci device that corresponds to a given address. + */ +void eeh_addr_cache_init(void) +{ + spin_lock_init(&pci_io_addr_cache_root.piar_lock); +} + +static int eeh_addr_cache_show(struct seq_file *s, void *v) +{ + struct pci_io_addr_range *piar; + struct rb_node *n; + unsigned long flags; + + spin_lock_irqsave(&pci_io_addr_cache_root.piar_lock, flags); + for (n = rb_first(&pci_io_addr_cache_root.rb_root); n; n = rb_next(n)) { + piar = rb_entry(n, struct pci_io_addr_range, rb_node); + + seq_printf(s, "%s addr range [%pap-%pap]: %s\n", + (piar->flags & IORESOURCE_IO) ? "i/o" : "mem", + &piar->addr_lo, &piar->addr_hi, pci_name(piar->pcidev)); + } + spin_unlock_irqrestore(&pci_io_addr_cache_root.piar_lock, flags); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(eeh_addr_cache); + +void __init eeh_cache_debugfs_init(void) +{ + debugfs_create_file_unsafe("eeh_address_cache", 0400, + arch_debugfs_dir, NULL, + &eeh_addr_cache_fops); +} diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c new file mode 100644 index 000000000..f27929517 --- /dev/null +++ b/arch/powerpc/kernel/eeh_driver.c @@ -0,0 +1,1222 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * PCI Error Recovery Driver for RPA-compliant PPC64 platform. + * Copyright IBM Corp. 2004 2005 + * Copyright Linas Vepstas <linas@linas.org> 2004, 2005 + * + * Send comments and feedback to Linas Vepstas <linas@austin.ibm.com> + */ +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/pci_hotplug.h> +#include <asm/eeh.h> +#include <asm/eeh_event.h> +#include <asm/ppc-pci.h> +#include <asm/pci-bridge.h> +#include <asm/rtas.h> + +struct eeh_rmv_data { + struct list_head removed_vf_list; + int removed_dev_count; +}; + +static int eeh_result_priority(enum pci_ers_result result) +{ + switch (result) { + case PCI_ERS_RESULT_NONE: + return 1; + case PCI_ERS_RESULT_NO_AER_DRIVER: + return 2; + case PCI_ERS_RESULT_RECOVERED: + return 3; + case PCI_ERS_RESULT_CAN_RECOVER: + return 4; + case PCI_ERS_RESULT_DISCONNECT: + return 5; + case PCI_ERS_RESULT_NEED_RESET: + return 6; + default: + WARN_ONCE(1, "Unknown pci_ers_result value: %d\n", (int)result); + return 0; + } +}; + +static const char *pci_ers_result_name(enum pci_ers_result result) +{ + switch (result) { + case PCI_ERS_RESULT_NONE: + return "none"; + case PCI_ERS_RESULT_CAN_RECOVER: + return "can recover"; + case PCI_ERS_RESULT_NEED_RESET: + return "need reset"; + case PCI_ERS_RESULT_DISCONNECT: + return "disconnect"; + case PCI_ERS_RESULT_RECOVERED: + return "recovered"; + case PCI_ERS_RESULT_NO_AER_DRIVER: + return "no AER driver"; + default: + WARN_ONCE(1, "Unknown result type: %d\n", (int)result); + return "unknown"; + } +}; + +static enum pci_ers_result pci_ers_merge_result(enum pci_ers_result old, + enum pci_ers_result new) +{ + if (eeh_result_priority(new) > eeh_result_priority(old)) + return new; + return old; +} + +static bool eeh_dev_removed(struct eeh_dev *edev) +{ + return !edev || (edev->mode & EEH_DEV_REMOVED); +} + +static bool eeh_edev_actionable(struct eeh_dev *edev) +{ + if (!edev->pdev) + return false; + if (edev->pdev->error_state == pci_channel_io_perm_failure) + return false; + if (eeh_dev_removed(edev)) + return false; + if (eeh_pe_passed(edev->pe)) + return false; + + return true; +} + +/** + * eeh_pcid_get - Get the PCI device driver + * @pdev: PCI device + * + * The function is used to retrieve the PCI device driver for + * the indicated PCI device. Besides, we will increase the reference + * of the PCI device driver to prevent that being unloaded on + * the fly. Otherwise, kernel crash would be seen. + */ +static inline struct pci_driver *eeh_pcid_get(struct pci_dev *pdev) +{ + if (!pdev || !pdev->dev.driver) + return NULL; + + if (!try_module_get(pdev->dev.driver->owner)) + return NULL; + + return to_pci_driver(pdev->dev.driver); +} + +/** + * eeh_pcid_put - Dereference on the PCI device driver + * @pdev: PCI device + * + * The function is called to do dereference on the PCI device + * driver of the indicated PCI device. + */ +static inline void eeh_pcid_put(struct pci_dev *pdev) +{ + if (!pdev || !pdev->dev.driver) + return; + + module_put(pdev->dev.driver->owner); +} + +/** + * eeh_disable_irq - Disable interrupt for the recovering device + * @dev: PCI device + * + * This routine must be called when reporting temporary or permanent + * error to the particular PCI device to disable interrupt of that + * device. If the device has enabled MSI or MSI-X interrupt, we needn't + * do real work because EEH should freeze DMA transfers for those PCI + * devices encountering EEH errors, which includes MSI or MSI-X. + */ +static void eeh_disable_irq(struct eeh_dev *edev) +{ + /* Don't disable MSI and MSI-X interrupts. They are + * effectively disabled by the DMA Stopped state + * when an EEH error occurs. + */ + if (edev->pdev->msi_enabled || edev->pdev->msix_enabled) + return; + + if (!irq_has_action(edev->pdev->irq)) + return; + + edev->mode |= EEH_DEV_IRQ_DISABLED; + disable_irq_nosync(edev->pdev->irq); +} + +/** + * eeh_enable_irq - Enable interrupt for the recovering device + * @dev: PCI device + * + * This routine must be called to enable interrupt while failed + * device could be resumed. + */ +static void eeh_enable_irq(struct eeh_dev *edev) +{ + if ((edev->mode) & EEH_DEV_IRQ_DISABLED) { + edev->mode &= ~EEH_DEV_IRQ_DISABLED; + /* + * FIXME !!!!! + * + * This is just ass backwards. This maze has + * unbalanced irq_enable/disable calls. So instead of + * finding the root cause it works around the warning + * in the irq_enable code by conditionally calling + * into it. + * + * That's just wrong.The warning in the core code is + * there to tell people to fix their asymmetries in + * their own code, not by abusing the core information + * to avoid it. + * + * I so wish that the assymetry would be the other way + * round and a few more irq_disable calls render that + * shit unusable forever. + * + * tglx + */ + if (irqd_irq_disabled(irq_get_irq_data(edev->pdev->irq))) + enable_irq(edev->pdev->irq); + } +} + +static void eeh_dev_save_state(struct eeh_dev *edev, void *userdata) +{ + struct pci_dev *pdev; + + if (!edev) + return; + + /* + * We cannot access the config space on some adapters. + * Otherwise, it will cause fenced PHB. We don't save + * the content in their config space and will restore + * from the initial config space saved when the EEH + * device is created. + */ + if (edev->pe && (edev->pe->state & EEH_PE_CFG_RESTRICTED)) + return; + + pdev = eeh_dev_to_pci_dev(edev); + if (!pdev) + return; + + pci_save_state(pdev); +} + +static void eeh_set_channel_state(struct eeh_pe *root, pci_channel_state_t s) +{ + struct eeh_pe *pe; + struct eeh_dev *edev, *tmp; + + eeh_for_each_pe(root, pe) + eeh_pe_for_each_dev(pe, edev, tmp) + if (eeh_edev_actionable(edev)) + edev->pdev->error_state = s; +} + +static void eeh_set_irq_state(struct eeh_pe *root, bool enable) +{ + struct eeh_pe *pe; + struct eeh_dev *edev, *tmp; + + eeh_for_each_pe(root, pe) { + eeh_pe_for_each_dev(pe, edev, tmp) { + if (!eeh_edev_actionable(edev)) + continue; + + if (!eeh_pcid_get(edev->pdev)) + continue; + + if (enable) + eeh_enable_irq(edev); + else + eeh_disable_irq(edev); + + eeh_pcid_put(edev->pdev); + } + } +} + +typedef enum pci_ers_result (*eeh_report_fn)(struct eeh_dev *, + struct pci_dev *, + struct pci_driver *); +static void eeh_pe_report_edev(struct eeh_dev *edev, eeh_report_fn fn, + enum pci_ers_result *result) +{ + struct pci_dev *pdev; + struct pci_driver *driver; + enum pci_ers_result new_result; + + pci_lock_rescan_remove(); + pdev = edev->pdev; + if (pdev) + get_device(&pdev->dev); + pci_unlock_rescan_remove(); + if (!pdev) { + eeh_edev_info(edev, "no device"); + return; + } + device_lock(&pdev->dev); + if (eeh_edev_actionable(edev)) { + driver = eeh_pcid_get(pdev); + + if (!driver) + eeh_edev_info(edev, "no driver"); + else if (!driver->err_handler) + eeh_edev_info(edev, "driver not EEH aware"); + else if (edev->mode & EEH_DEV_NO_HANDLER) + eeh_edev_info(edev, "driver bound too late"); + else { + new_result = fn(edev, pdev, driver); + eeh_edev_info(edev, "%s driver reports: '%s'", + driver->name, + pci_ers_result_name(new_result)); + if (result) + *result = pci_ers_merge_result(*result, + new_result); + } + if (driver) + eeh_pcid_put(pdev); + } else { + eeh_edev_info(edev, "not actionable (%d,%d,%d)", !!pdev, + !eeh_dev_removed(edev), !eeh_pe_passed(edev->pe)); + } + device_unlock(&pdev->dev); + if (edev->pdev != pdev) + eeh_edev_warn(edev, "Device changed during processing!\n"); + put_device(&pdev->dev); +} + +static void eeh_pe_report(const char *name, struct eeh_pe *root, + eeh_report_fn fn, enum pci_ers_result *result) +{ + struct eeh_pe *pe; + struct eeh_dev *edev, *tmp; + + pr_info("EEH: Beginning: '%s'\n", name); + eeh_for_each_pe(root, pe) eeh_pe_for_each_dev(pe, edev, tmp) + eeh_pe_report_edev(edev, fn, result); + if (result) + pr_info("EEH: Finished:'%s' with aggregate recovery state:'%s'\n", + name, pci_ers_result_name(*result)); + else + pr_info("EEH: Finished:'%s'", name); +} + +/** + * eeh_report_error - Report pci error to each device driver + * @edev: eeh device + * @driver: device's PCI driver + * + * Report an EEH error to each device driver. + */ +static enum pci_ers_result eeh_report_error(struct eeh_dev *edev, + struct pci_dev *pdev, + struct pci_driver *driver) +{ + enum pci_ers_result rc; + + if (!driver->err_handler->error_detected) + return PCI_ERS_RESULT_NONE; + + eeh_edev_info(edev, "Invoking %s->error_detected(IO frozen)", + driver->name); + rc = driver->err_handler->error_detected(pdev, pci_channel_io_frozen); + + edev->in_error = true; + pci_uevent_ers(pdev, PCI_ERS_RESULT_NONE); + return rc; +} + +/** + * eeh_report_mmio_enabled - Tell drivers that MMIO has been enabled + * @edev: eeh device + * @driver: device's PCI driver + * + * Tells each device driver that IO ports, MMIO and config space I/O + * are now enabled. + */ +static enum pci_ers_result eeh_report_mmio_enabled(struct eeh_dev *edev, + struct pci_dev *pdev, + struct pci_driver *driver) +{ + if (!driver->err_handler->mmio_enabled) + return PCI_ERS_RESULT_NONE; + eeh_edev_info(edev, "Invoking %s->mmio_enabled()", driver->name); + return driver->err_handler->mmio_enabled(pdev); +} + +/** + * eeh_report_reset - Tell device that slot has been reset + * @edev: eeh device + * @driver: device's PCI driver + * + * This routine must be called while EEH tries to reset particular + * PCI device so that the associated PCI device driver could take + * some actions, usually to save data the driver needs so that the + * driver can work again while the device is recovered. + */ +static enum pci_ers_result eeh_report_reset(struct eeh_dev *edev, + struct pci_dev *pdev, + struct pci_driver *driver) +{ + if (!driver->err_handler->slot_reset || !edev->in_error) + return PCI_ERS_RESULT_NONE; + eeh_edev_info(edev, "Invoking %s->slot_reset()", driver->name); + return driver->err_handler->slot_reset(pdev); +} + +static void eeh_dev_restore_state(struct eeh_dev *edev, void *userdata) +{ + struct pci_dev *pdev; + + if (!edev) + return; + + /* + * The content in the config space isn't saved because + * the blocked config space on some adapters. We have + * to restore the initial saved config space when the + * EEH device is created. + */ + if (edev->pe && (edev->pe->state & EEH_PE_CFG_RESTRICTED)) { + if (list_is_last(&edev->entry, &edev->pe->edevs)) + eeh_pe_restore_bars(edev->pe); + + return; + } + + pdev = eeh_dev_to_pci_dev(edev); + if (!pdev) + return; + + pci_restore_state(pdev); +} + +/** + * eeh_report_resume - Tell device to resume normal operations + * @edev: eeh device + * @driver: device's PCI driver + * + * This routine must be called to notify the device driver that it + * could resume so that the device driver can do some initialization + * to make the recovered device work again. + */ +static enum pci_ers_result eeh_report_resume(struct eeh_dev *edev, + struct pci_dev *pdev, + struct pci_driver *driver) +{ + if (!driver->err_handler->resume || !edev->in_error) + return PCI_ERS_RESULT_NONE; + + eeh_edev_info(edev, "Invoking %s->resume()", driver->name); + driver->err_handler->resume(pdev); + + pci_uevent_ers(edev->pdev, PCI_ERS_RESULT_RECOVERED); +#ifdef CONFIG_PCI_IOV + if (eeh_ops->notify_resume) + eeh_ops->notify_resume(edev); +#endif + return PCI_ERS_RESULT_NONE; +} + +/** + * eeh_report_failure - Tell device driver that device is dead. + * @edev: eeh device + * @driver: device's PCI driver + * + * This informs the device driver that the device is permanently + * dead, and that no further recovery attempts will be made on it. + */ +static enum pci_ers_result eeh_report_failure(struct eeh_dev *edev, + struct pci_dev *pdev, + struct pci_driver *driver) +{ + enum pci_ers_result rc; + + if (!driver->err_handler->error_detected) + return PCI_ERS_RESULT_NONE; + + eeh_edev_info(edev, "Invoking %s->error_detected(permanent failure)", + driver->name); + rc = driver->err_handler->error_detected(pdev, + pci_channel_io_perm_failure); + + pci_uevent_ers(pdev, PCI_ERS_RESULT_DISCONNECT); + return rc; +} + +static void *eeh_add_virt_device(struct eeh_dev *edev) +{ + struct pci_driver *driver; + struct pci_dev *dev = eeh_dev_to_pci_dev(edev); + + if (!(edev->physfn)) { + eeh_edev_warn(edev, "Not for VF\n"); + return NULL; + } + + driver = eeh_pcid_get(dev); + if (driver) { + if (driver->err_handler) { + eeh_pcid_put(dev); + return NULL; + } + eeh_pcid_put(dev); + } + +#ifdef CONFIG_PCI_IOV + pci_iov_add_virtfn(edev->physfn, edev->vf_index); +#endif + return NULL; +} + +static void eeh_rmv_device(struct eeh_dev *edev, void *userdata) +{ + struct pci_driver *driver; + struct pci_dev *dev = eeh_dev_to_pci_dev(edev); + struct eeh_rmv_data *rmv_data = (struct eeh_rmv_data *)userdata; + + /* + * Actually, we should remove the PCI bridges as well. + * However, that's lots of complexity to do that, + * particularly some of devices under the bridge might + * support EEH. So we just care about PCI devices for + * simplicity here. + */ + if (!eeh_edev_actionable(edev) || + (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)) + return; + + if (rmv_data) { + driver = eeh_pcid_get(dev); + if (driver) { + if (driver->err_handler && + driver->err_handler->error_detected && + driver->err_handler->slot_reset) { + eeh_pcid_put(dev); + return; + } + eeh_pcid_put(dev); + } + } + + /* Remove it from PCI subsystem */ + pr_info("EEH: Removing %s without EEH sensitive driver\n", + pci_name(dev)); + edev->mode |= EEH_DEV_DISCONNECTED; + if (rmv_data) + rmv_data->removed_dev_count++; + + if (edev->physfn) { +#ifdef CONFIG_PCI_IOV + pci_iov_remove_virtfn(edev->physfn, edev->vf_index); + edev->pdev = NULL; +#endif + if (rmv_data) + list_add(&edev->rmv_entry, &rmv_data->removed_vf_list); + } else { + pci_lock_rescan_remove(); + pci_stop_and_remove_bus_device(dev); + pci_unlock_rescan_remove(); + } +} + +static void *eeh_pe_detach_dev(struct eeh_pe *pe, void *userdata) +{ + struct eeh_dev *edev, *tmp; + + eeh_pe_for_each_dev(pe, edev, tmp) { + if (!(edev->mode & EEH_DEV_DISCONNECTED)) + continue; + + edev->mode &= ~(EEH_DEV_DISCONNECTED | EEH_DEV_IRQ_DISABLED); + eeh_pe_tree_remove(edev); + } + + return NULL; +} + +/* + * Explicitly clear PE's frozen state for PowerNV where + * we have frozen PE until BAR restore is completed. It's + * harmless to clear it for pSeries. To be consistent with + * PE reset (for 3 times), we try to clear the frozen state + * for 3 times as well. + */ +static int eeh_clear_pe_frozen_state(struct eeh_pe *root, bool include_passed) +{ + struct eeh_pe *pe; + int i; + + eeh_for_each_pe(root, pe) { + if (include_passed || !eeh_pe_passed(pe)) { + for (i = 0; i < 3; i++) + if (!eeh_unfreeze_pe(pe)) + break; + if (i >= 3) + return -EIO; + } + } + eeh_pe_state_clear(root, EEH_PE_ISOLATED, include_passed); + return 0; +} + +int eeh_pe_reset_and_recover(struct eeh_pe *pe) +{ + int ret; + + /* Bail if the PE is being recovered */ + if (pe->state & EEH_PE_RECOVERING) + return 0; + + /* Put the PE into recovery mode */ + eeh_pe_state_mark(pe, EEH_PE_RECOVERING); + + /* Save states */ + eeh_pe_dev_traverse(pe, eeh_dev_save_state, NULL); + + /* Issue reset */ + ret = eeh_pe_reset_full(pe, true); + if (ret) { + eeh_pe_state_clear(pe, EEH_PE_RECOVERING, true); + return ret; + } + + /* Unfreeze the PE */ + ret = eeh_clear_pe_frozen_state(pe, true); + if (ret) { + eeh_pe_state_clear(pe, EEH_PE_RECOVERING, true); + return ret; + } + + /* Restore device state */ + eeh_pe_dev_traverse(pe, eeh_dev_restore_state, NULL); + + /* Clear recovery mode */ + eeh_pe_state_clear(pe, EEH_PE_RECOVERING, true); + + return 0; +} + +/** + * eeh_reset_device - Perform actual reset of a pci slot + * @driver_eeh_aware: Does the device's driver provide EEH support? + * @pe: EEH PE + * @bus: PCI bus corresponding to the isolcated slot + * @rmv_data: Optional, list to record removed devices + * + * This routine must be called to do reset on the indicated PE. + * During the reset, udev might be invoked because those affected + * PCI devices will be removed and then added. + */ +static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus, + struct eeh_rmv_data *rmv_data, + bool driver_eeh_aware) +{ + time64_t tstamp; + int cnt, rc; + struct eeh_dev *edev; + struct eeh_pe *tmp_pe; + bool any_passed = false; + + eeh_for_each_pe(pe, tmp_pe) + any_passed |= eeh_pe_passed(tmp_pe); + + /* pcibios will clear the counter; save the value */ + cnt = pe->freeze_count; + tstamp = pe->tstamp; + + /* + * We don't remove the corresponding PE instances because + * we need the information afterwords. The attached EEH + * devices are expected to be attached soon when calling + * into pci_hp_add_devices(). + */ + eeh_pe_state_mark(pe, EEH_PE_KEEP); + if (any_passed || driver_eeh_aware || (pe->type & EEH_PE_VF)) { + eeh_pe_dev_traverse(pe, eeh_rmv_device, rmv_data); + } else { + pci_lock_rescan_remove(); + pci_hp_remove_devices(bus); + pci_unlock_rescan_remove(); + } + + /* + * Reset the pci controller. (Asserts RST#; resets config space). + * Reconfigure bridges and devices. Don't try to bring the system + * up if the reset failed for some reason. + * + * During the reset, it's very dangerous to have uncontrolled PCI + * config accesses. So we prefer to block them. However, controlled + * PCI config accesses initiated from EEH itself are allowed. + */ + rc = eeh_pe_reset_full(pe, false); + if (rc) + return rc; + + pci_lock_rescan_remove(); + + /* Restore PE */ + eeh_ops->configure_bridge(pe); + eeh_pe_restore_bars(pe); + + /* Clear frozen state */ + rc = eeh_clear_pe_frozen_state(pe, false); + if (rc) { + pci_unlock_rescan_remove(); + return rc; + } + + /* Give the system 5 seconds to finish running the user-space + * hotplug shutdown scripts, e.g. ifdown for ethernet. Yes, + * this is a hack, but if we don't do this, and try to bring + * the device up before the scripts have taken it down, + * potentially weird things happen. + */ + if (!driver_eeh_aware || rmv_data->removed_dev_count) { + pr_info("EEH: Sleep 5s ahead of %s hotplug\n", + (driver_eeh_aware ? "partial" : "complete")); + ssleep(5); + + /* + * The EEH device is still connected with its parent + * PE. We should disconnect it so the binding can be + * rebuilt when adding PCI devices. + */ + edev = list_first_entry(&pe->edevs, struct eeh_dev, entry); + eeh_pe_traverse(pe, eeh_pe_detach_dev, NULL); + if (pe->type & EEH_PE_VF) { + eeh_add_virt_device(edev); + } else { + if (!driver_eeh_aware) + eeh_pe_state_clear(pe, EEH_PE_PRI_BUS, true); + pci_hp_add_devices(bus); + } + } + eeh_pe_state_clear(pe, EEH_PE_KEEP, true); + + pe->tstamp = tstamp; + pe->freeze_count = cnt; + + pci_unlock_rescan_remove(); + return 0; +} + +/* The longest amount of time to wait for a pci device + * to come back on line, in seconds. + */ +#define MAX_WAIT_FOR_RECOVERY 300 + + +/* Walks the PE tree after processing an event to remove any stale PEs. + * + * NB: This needs to be recursive to ensure the leaf PEs get removed + * before their parents do. Although this is possible to do recursively + * we don't since this is easier to read and we need to garantee + * the leaf nodes will be handled first. + */ +static void eeh_pe_cleanup(struct eeh_pe *pe) +{ + struct eeh_pe *child_pe, *tmp; + + list_for_each_entry_safe(child_pe, tmp, &pe->child_list, child) + eeh_pe_cleanup(child_pe); + + if (pe->state & EEH_PE_KEEP) + return; + + if (!(pe->state & EEH_PE_INVALID)) + return; + + if (list_empty(&pe->edevs) && list_empty(&pe->child_list)) { + list_del(&pe->child); + kfree(pe); + } +} + +/** + * eeh_check_slot_presence - Check if a device is still present in a slot + * @pdev: pci_dev to check + * + * This function may return a false positive if we can't determine the slot's + * presence state. This might happen for PCIe slots if the PE containing + * the upstream bridge is also frozen, or the bridge is part of the same PE + * as the device. + * + * This shouldn't happen often, but you might see it if you hotplug a PCIe + * switch. + */ +static bool eeh_slot_presence_check(struct pci_dev *pdev) +{ + const struct hotplug_slot_ops *ops; + struct pci_slot *slot; + u8 state; + int rc; + + if (!pdev) + return false; + + if (pdev->error_state == pci_channel_io_perm_failure) + return false; + + slot = pdev->slot; + if (!slot || !slot->hotplug) + return true; + + ops = slot->hotplug->ops; + if (!ops || !ops->get_adapter_status) + return true; + + /* set the attention indicator while we've got the slot ops */ + if (ops->set_attention_status) + ops->set_attention_status(slot->hotplug, 1); + + rc = ops->get_adapter_status(slot->hotplug, &state); + if (rc) + return true; + + return !!state; +} + +static void eeh_clear_slot_attention(struct pci_dev *pdev) +{ + const struct hotplug_slot_ops *ops; + struct pci_slot *slot; + + if (!pdev) + return; + + if (pdev->error_state == pci_channel_io_perm_failure) + return; + + slot = pdev->slot; + if (!slot || !slot->hotplug) + return; + + ops = slot->hotplug->ops; + if (!ops || !ops->set_attention_status) + return; + + ops->set_attention_status(slot->hotplug, 0); +} + +/** + * eeh_handle_normal_event - Handle EEH events on a specific PE + * @pe: EEH PE - which should not be used after we return, as it may + * have been invalidated. + * + * Attempts to recover the given PE. If recovery fails or the PE has failed + * too many times, remove the PE. + * + * While PHB detects address or data parity errors on particular PCI + * slot, the associated PE will be frozen. Besides, DMA's occurring + * to wild addresses (which usually happen due to bugs in device + * drivers or in PCI adapter firmware) can cause EEH error. #SERR, + * #PERR or other misc PCI-related errors also can trigger EEH errors. + * + * Recovery process consists of unplugging the device driver (which + * generated hotplug events to userspace), then issuing a PCI #RST to + * the device, then reconfiguring the PCI config space for all bridges + * & devices under this slot, and then finally restarting the device + * drivers (which cause a second set of hotplug events to go out to + * userspace). + */ +void eeh_handle_normal_event(struct eeh_pe *pe) +{ + struct pci_bus *bus; + struct eeh_dev *edev, *tmp; + struct eeh_pe *tmp_pe; + int rc = 0; + enum pci_ers_result result = PCI_ERS_RESULT_NONE; + struct eeh_rmv_data rmv_data = + {LIST_HEAD_INIT(rmv_data.removed_vf_list), 0}; + int devices = 0; + + bus = eeh_pe_bus_get(pe); + if (!bus) { + pr_err("%s: Cannot find PCI bus for PHB#%x-PE#%x\n", + __func__, pe->phb->global_number, pe->addr); + return; + } + + /* + * When devices are hot-removed we might get an EEH due to + * a driver attempting to touch the MMIO space of a removed + * device. In this case we don't have a device to recover + * so suppress the event if we can't find any present devices. + * + * The hotplug driver should take care of tearing down the + * device itself. + */ + eeh_for_each_pe(pe, tmp_pe) + eeh_pe_for_each_dev(tmp_pe, edev, tmp) + if (eeh_slot_presence_check(edev->pdev)) + devices++; + + if (!devices) { + pr_debug("EEH: Frozen PHB#%x-PE#%x is empty!\n", + pe->phb->global_number, pe->addr); + goto out; /* nothing to recover */ + } + + /* Log the event */ + if (pe->type & EEH_PE_PHB) { + pr_err("EEH: Recovering PHB#%x, location: %s\n", + pe->phb->global_number, eeh_pe_loc_get(pe)); + } else { + struct eeh_pe *phb_pe = eeh_phb_pe_get(pe->phb); + + pr_err("EEH: Recovering PHB#%x-PE#%x\n", + pe->phb->global_number, pe->addr); + pr_err("EEH: PE location: %s, PHB location: %s\n", + eeh_pe_loc_get(pe), eeh_pe_loc_get(phb_pe)); + } + +#ifdef CONFIG_STACKTRACE + /* + * Print the saved stack trace now that we've verified there's + * something to recover. + */ + if (pe->trace_entries) { + void **ptrs = (void **) pe->stack_trace; + int i; + + pr_err("EEH: Frozen PHB#%x-PE#%x detected\n", + pe->phb->global_number, pe->addr); + + /* FIXME: Use the same format as dump_stack() */ + pr_err("EEH: Call Trace:\n"); + for (i = 0; i < pe->trace_entries; i++) + pr_err("EEH: [%pK] %pS\n", ptrs[i], ptrs[i]); + + pe->trace_entries = 0; + } +#endif /* CONFIG_STACKTRACE */ + + eeh_for_each_pe(pe, tmp_pe) + eeh_pe_for_each_dev(tmp_pe, edev, tmp) + edev->mode &= ~EEH_DEV_NO_HANDLER; + + eeh_pe_update_time_stamp(pe); + pe->freeze_count++; + if (pe->freeze_count > eeh_max_freezes) { + pr_err("EEH: PHB#%x-PE#%x has failed %d times in the last hour and has been permanently disabled.\n", + pe->phb->global_number, pe->addr, + pe->freeze_count); + + goto recover_failed; + } + + /* Walk the various device drivers attached to this slot through + * a reset sequence, giving each an opportunity to do what it needs + * to accomplish the reset. Each child gets a report of the + * status ... if any child can't handle the reset, then the entire + * slot is dlpar removed and added. + * + * When the PHB is fenced, we have to issue a reset to recover from + * the error. Override the result if necessary to have partially + * hotplug for this case. + */ + pr_warn("EEH: This PCI device has failed %d times in the last hour and will be permanently disabled after %d failures.\n", + pe->freeze_count, eeh_max_freezes); + pr_info("EEH: Notify device drivers to shutdown\n"); + eeh_set_channel_state(pe, pci_channel_io_frozen); + eeh_set_irq_state(pe, false); + eeh_pe_report("error_detected(IO frozen)", pe, + eeh_report_error, &result); + if (result == PCI_ERS_RESULT_DISCONNECT) + goto recover_failed; + + /* + * Error logged on a PHB are always fences which need a full + * PHB reset to clear so force that to happen. + */ + if ((pe->type & EEH_PE_PHB) && result != PCI_ERS_RESULT_NONE) + result = PCI_ERS_RESULT_NEED_RESET; + + /* Get the current PCI slot state. This can take a long time, + * sometimes over 300 seconds for certain systems. + */ + rc = eeh_wait_state(pe, MAX_WAIT_FOR_RECOVERY * 1000); + if (rc < 0 || rc == EEH_STATE_NOT_SUPPORT) { + pr_warn("EEH: Permanent failure\n"); + goto recover_failed; + } + + /* Since rtas may enable MMIO when posting the error log, + * don't post the error log until after all dev drivers + * have been informed. + */ + pr_info("EEH: Collect temporary log\n"); + eeh_slot_error_detail(pe, EEH_LOG_TEMP); + + /* If all device drivers were EEH-unaware, then shut + * down all of the device drivers, and hope they + * go down willingly, without panicing the system. + */ + if (result == PCI_ERS_RESULT_NONE) { + pr_info("EEH: Reset with hotplug activity\n"); + rc = eeh_reset_device(pe, bus, NULL, false); + if (rc) { + pr_warn("%s: Unable to reset, err=%d\n", __func__, rc); + goto recover_failed; + } + } + + /* If all devices reported they can proceed, then re-enable MMIO */ + if (result == PCI_ERS_RESULT_CAN_RECOVER) { + pr_info("EEH: Enable I/O for affected devices\n"); + rc = eeh_pci_enable(pe, EEH_OPT_THAW_MMIO); + if (rc < 0) + goto recover_failed; + + if (rc) { + result = PCI_ERS_RESULT_NEED_RESET; + } else { + pr_info("EEH: Notify device drivers to resume I/O\n"); + eeh_pe_report("mmio_enabled", pe, + eeh_report_mmio_enabled, &result); + } + } + if (result == PCI_ERS_RESULT_CAN_RECOVER) { + pr_info("EEH: Enabled DMA for affected devices\n"); + rc = eeh_pci_enable(pe, EEH_OPT_THAW_DMA); + if (rc < 0) + goto recover_failed; + + if (rc) { + result = PCI_ERS_RESULT_NEED_RESET; + } else { + /* + * We didn't do PE reset for the case. The PE + * is still in frozen state. Clear it before + * resuming the PE. + */ + eeh_pe_state_clear(pe, EEH_PE_ISOLATED, true); + result = PCI_ERS_RESULT_RECOVERED; + } + } + + /* If any device called out for a reset, then reset the slot */ + if (result == PCI_ERS_RESULT_NEED_RESET) { + pr_info("EEH: Reset without hotplug activity\n"); + rc = eeh_reset_device(pe, bus, &rmv_data, true); + if (rc) { + pr_warn("%s: Cannot reset, err=%d\n", __func__, rc); + goto recover_failed; + } + + result = PCI_ERS_RESULT_NONE; + eeh_set_channel_state(pe, pci_channel_io_normal); + eeh_set_irq_state(pe, true); + eeh_pe_report("slot_reset", pe, eeh_report_reset, + &result); + } + + if ((result == PCI_ERS_RESULT_RECOVERED) || + (result == PCI_ERS_RESULT_NONE)) { + /* + * For those hot removed VFs, we should add back them after PF + * get recovered properly. + */ + list_for_each_entry_safe(edev, tmp, &rmv_data.removed_vf_list, + rmv_entry) { + eeh_add_virt_device(edev); + list_del(&edev->rmv_entry); + } + + /* Tell all device drivers that they can resume operations */ + pr_info("EEH: Notify device driver to resume\n"); + eeh_set_channel_state(pe, pci_channel_io_normal); + eeh_set_irq_state(pe, true); + eeh_pe_report("resume", pe, eeh_report_resume, NULL); + eeh_for_each_pe(pe, tmp_pe) { + eeh_pe_for_each_dev(tmp_pe, edev, tmp) { + edev->mode &= ~EEH_DEV_NO_HANDLER; + edev->in_error = false; + } + } + + pr_info("EEH: Recovery successful.\n"); + goto out; + } + +recover_failed: + /* + * About 90% of all real-life EEH failures in the field + * are due to poorly seated PCI cards. Only 10% or so are + * due to actual, failed cards. + */ + pr_err("EEH: Unable to recover from failure from PHB#%x-PE#%x.\n" + "Please try reseating or replacing it\n", + pe->phb->global_number, pe->addr); + + eeh_slot_error_detail(pe, EEH_LOG_PERM); + + /* Notify all devices that they're about to go down. */ + eeh_set_channel_state(pe, pci_channel_io_perm_failure); + eeh_set_irq_state(pe, false); + eeh_pe_report("error_detected(permanent failure)", pe, + eeh_report_failure, NULL); + + /* Mark the PE to be removed permanently */ + eeh_pe_state_mark(pe, EEH_PE_REMOVED); + + /* + * Shut down the device drivers for good. We mark + * all removed devices correctly to avoid access + * the their PCI config any more. + */ + if (pe->type & EEH_PE_VF) { + eeh_pe_dev_traverse(pe, eeh_rmv_device, NULL); + eeh_pe_dev_mode_mark(pe, EEH_DEV_REMOVED); + } else { + eeh_pe_state_clear(pe, EEH_PE_PRI_BUS, true); + eeh_pe_dev_mode_mark(pe, EEH_DEV_REMOVED); + + pci_lock_rescan_remove(); + pci_hp_remove_devices(bus); + pci_unlock_rescan_remove(); + /* The passed PE should no longer be used */ + return; + } + +out: + /* + * Clean up any PEs without devices. While marked as EEH_PE_RECOVERYING + * we don't want to modify the PE tree structure so we do it here. + */ + eeh_pe_cleanup(pe); + + /* clear the slot attention LED for all recovered devices */ + eeh_for_each_pe(pe, tmp_pe) + eeh_pe_for_each_dev(tmp_pe, edev, tmp) + eeh_clear_slot_attention(edev->pdev); + + eeh_pe_state_clear(pe, EEH_PE_RECOVERING, true); +} + +/** + * eeh_handle_special_event - Handle EEH events without a specific failing PE + * + * Called when an EEH event is detected but can't be narrowed down to a + * specific PE. Iterates through possible failures and handles them as + * necessary. + */ +void eeh_handle_special_event(void) +{ + struct eeh_pe *pe, *phb_pe, *tmp_pe; + struct eeh_dev *edev, *tmp_edev; + struct pci_bus *bus; + struct pci_controller *hose; + unsigned long flags; + int rc; + + + do { + rc = eeh_ops->next_error(&pe); + + switch (rc) { + case EEH_NEXT_ERR_DEAD_IOC: + /* Mark all PHBs in dead state */ + eeh_serialize_lock(&flags); + + /* Purge all events */ + eeh_remove_event(NULL, true); + + list_for_each_entry(hose, &hose_list, list_node) { + phb_pe = eeh_phb_pe_get(hose); + if (!phb_pe) continue; + + eeh_pe_mark_isolated(phb_pe); + } + + eeh_serialize_unlock(flags); + + break; + case EEH_NEXT_ERR_FROZEN_PE: + case EEH_NEXT_ERR_FENCED_PHB: + case EEH_NEXT_ERR_DEAD_PHB: + /* Mark the PE in fenced state */ + eeh_serialize_lock(&flags); + + /* Purge all events of the PHB */ + eeh_remove_event(pe, true); + + if (rc != EEH_NEXT_ERR_DEAD_PHB) + eeh_pe_state_mark(pe, EEH_PE_RECOVERING); + eeh_pe_mark_isolated(pe); + + eeh_serialize_unlock(flags); + + break; + case EEH_NEXT_ERR_NONE: + return; + default: + pr_warn("%s: Invalid value %d from next_error()\n", + __func__, rc); + return; + } + + /* + * For fenced PHB and frozen PE, it's handled as normal + * event. We have to remove the affected PHBs for dead + * PHB and IOC + */ + if (rc == EEH_NEXT_ERR_FROZEN_PE || + rc == EEH_NEXT_ERR_FENCED_PHB) { + eeh_pe_state_mark(pe, EEH_PE_RECOVERING); + eeh_handle_normal_event(pe); + } else { + eeh_for_each_pe(pe, tmp_pe) + eeh_pe_for_each_dev(tmp_pe, edev, tmp_edev) + edev->mode &= ~EEH_DEV_NO_HANDLER; + + /* Notify all devices to be down */ + eeh_pe_state_clear(pe, EEH_PE_PRI_BUS, true); + eeh_set_channel_state(pe, pci_channel_io_perm_failure); + eeh_pe_report( + "error_detected(permanent failure)", pe, + eeh_report_failure, NULL); + + pci_lock_rescan_remove(); + list_for_each_entry(hose, &hose_list, list_node) { + phb_pe = eeh_phb_pe_get(hose); + if (!phb_pe || + !(phb_pe->state & EEH_PE_ISOLATED) || + (phb_pe->state & EEH_PE_RECOVERING)) + continue; + + bus = eeh_pe_bus_get(phb_pe); + if (!bus) { + pr_err("%s: Cannot find PCI bus for " + "PHB#%x-PE#%x\n", + __func__, + pe->phb->global_number, + pe->addr); + break; + } + pci_hp_remove_devices(bus); + } + pci_unlock_rescan_remove(); + } + + /* + * If we have detected dead IOC, we needn't proceed + * any more since all PHBs would have been removed + */ + if (rc == EEH_NEXT_ERR_DEAD_IOC) + break; + } while (rc != EEH_NEXT_ERR_NONE); +} diff --git a/arch/powerpc/kernel/eeh_event.c b/arch/powerpc/kernel/eeh_event.c new file mode 100644 index 000000000..c23a454af --- /dev/null +++ b/arch/powerpc/kernel/eeh_event.c @@ -0,0 +1,201 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * + * Copyright (c) 2005 Linas Vepstas <linas@linas.org> + */ + +#include <linux/delay.h> +#include <linux/list.h> +#include <linux/sched.h> +#include <linux/semaphore.h> +#include <linux/pci.h> +#include <linux/slab.h> +#include <linux/kthread.h> +#include <asm/eeh_event.h> +#include <asm/ppc-pci.h> + +/** Overview: + * EEH error states may be detected within exception handlers; + * however, the recovery processing needs to occur asynchronously + * in a normal kernel context and not an interrupt context. + * This pair of routines creates an event and queues it onto a + * work-queue, where a worker thread can drive recovery. + */ + +static DEFINE_SPINLOCK(eeh_eventlist_lock); +static DECLARE_COMPLETION(eeh_eventlist_event); +static LIST_HEAD(eeh_eventlist); + +/** + * eeh_event_handler - Dispatch EEH events. + * @dummy - unused + * + * The detection of a frozen slot can occur inside an interrupt, + * where it can be hard to do anything about it. The goal of this + * routine is to pull these detection events out of the context + * of the interrupt handler, and re-dispatch them for processing + * at a later time in a normal context. + */ +static int eeh_event_handler(void * dummy) +{ + unsigned long flags; + struct eeh_event *event; + + while (!kthread_should_stop()) { + if (wait_for_completion_interruptible(&eeh_eventlist_event)) + break; + + /* Fetch EEH event from the queue */ + spin_lock_irqsave(&eeh_eventlist_lock, flags); + event = NULL; + if (!list_empty(&eeh_eventlist)) { + event = list_entry(eeh_eventlist.next, + struct eeh_event, list); + list_del(&event->list); + } + spin_unlock_irqrestore(&eeh_eventlist_lock, flags); + if (!event) + continue; + + /* We might have event without binding PE */ + if (event->pe) + eeh_handle_normal_event(event->pe); + else + eeh_handle_special_event(); + + kfree(event); + } + + return 0; +} + +/** + * eeh_event_init - Start kernel thread to handle EEH events + * + * This routine is called to start the kernel thread for processing + * EEH event. + */ +int eeh_event_init(void) +{ + struct task_struct *t; + int ret = 0; + + t = kthread_run(eeh_event_handler, NULL, "eehd"); + if (IS_ERR(t)) { + ret = PTR_ERR(t); + pr_err("%s: Failed to start EEH daemon (%d)\n", + __func__, ret); + return ret; + } + + return 0; +} + +/** + * eeh_send_failure_event - Generate a PCI error event + * @pe: EEH PE + * + * This routine can be called within an interrupt context; + * the actual event will be delivered in a normal context + * (from a workqueue). + */ +int __eeh_send_failure_event(struct eeh_pe *pe) +{ + unsigned long flags; + struct eeh_event *event; + + event = kzalloc(sizeof(*event), GFP_ATOMIC); + if (!event) { + pr_err("EEH: out of memory, event not handled\n"); + return -ENOMEM; + } + event->pe = pe; + + /* + * Mark the PE as recovering before inserting it in the queue. + * This prevents the PE from being free()ed by a hotplug driver + * while the PE is sitting in the event queue. + */ + if (pe) { +#ifdef CONFIG_STACKTRACE + /* + * Save the current stack trace so we can dump it from the + * event handler thread. + */ + pe->trace_entries = stack_trace_save(pe->stack_trace, + ARRAY_SIZE(pe->stack_trace), 0); +#endif /* CONFIG_STACKTRACE */ + + eeh_pe_state_mark(pe, EEH_PE_RECOVERING); + } + + /* We may or may not be called in an interrupt context */ + spin_lock_irqsave(&eeh_eventlist_lock, flags); + list_add(&event->list, &eeh_eventlist); + spin_unlock_irqrestore(&eeh_eventlist_lock, flags); + + /* For EEH deamon to knick in */ + complete(&eeh_eventlist_event); + + return 0; +} + +int eeh_send_failure_event(struct eeh_pe *pe) +{ + /* + * If we've manually suppressed recovery events via debugfs + * then just drop it on the floor. + */ + if (eeh_debugfs_no_recover) { + pr_err("EEH: Event dropped due to no_recover setting\n"); + return 0; + } + + return __eeh_send_failure_event(pe); +} + +/** + * eeh_remove_event - Remove EEH event from the queue + * @pe: Event binding to the PE + * @force: Event will be removed unconditionally + * + * On PowerNV platform, we might have subsequent coming events + * is part of the former one. For that case, those subsequent + * coming events are totally duplicated and unnecessary, thus + * they should be removed. + */ +void eeh_remove_event(struct eeh_pe *pe, bool force) +{ + unsigned long flags; + struct eeh_event *event, *tmp; + + /* + * If we have NULL PE passed in, we have dead IOC + * or we're sure we can report all existing errors + * by the caller. + * + * With "force", the event with associated PE that + * have been isolated, the event won't be removed + * to avoid event lost. + */ + spin_lock_irqsave(&eeh_eventlist_lock, flags); + list_for_each_entry_safe(event, tmp, &eeh_eventlist, list) { + if (!force && event->pe && + (event->pe->state & EEH_PE_ISOLATED)) + continue; + + if (!pe) { + list_del(&event->list); + kfree(event); + } else if (pe->type & EEH_PE_PHB) { + if (event->pe && event->pe->phb == pe->phb) { + list_del(&event->list); + kfree(event); + } + } else if (event->pe == pe) { + list_del(&event->list); + kfree(event); + } + } + spin_unlock_irqrestore(&eeh_eventlist_lock, flags); +} diff --git a/arch/powerpc/kernel/eeh_pe.c b/arch/powerpc/kernel/eeh_pe.c new file mode 100644 index 000000000..d2873d17d --- /dev/null +++ b/arch/powerpc/kernel/eeh_pe.c @@ -0,0 +1,868 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * The file intends to implement PE based on the information from + * platforms. Basically, there have 3 types of PEs: PHB/Bus/Device. + * All the PEs should be organized as hierarchy tree. The first level + * of the tree will be associated to existing PHBs since the particular + * PE is only meaningful in one PHB domain. + * + * Copyright Benjamin Herrenschmidt & Gavin Shan, IBM Corporation 2012. + */ + +#include <linux/delay.h> +#include <linux/export.h> +#include <linux/gfp.h> +#include <linux/kernel.h> +#include <linux/of.h> +#include <linux/pci.h> +#include <linux/string.h> + +#include <asm/pci-bridge.h> +#include <asm/ppc-pci.h> + +static int eeh_pe_aux_size = 0; +static LIST_HEAD(eeh_phb_pe); + +/** + * eeh_set_pe_aux_size - Set PE auxillary data size + * @size: PE auxillary data size + * + * Set PE auxillary data size + */ +void eeh_set_pe_aux_size(int size) +{ + if (size < 0) + return; + + eeh_pe_aux_size = size; +} + +/** + * eeh_pe_alloc - Allocate PE + * @phb: PCI controller + * @type: PE type + * + * Allocate PE instance dynamically. + */ +static struct eeh_pe *eeh_pe_alloc(struct pci_controller *phb, int type) +{ + struct eeh_pe *pe; + size_t alloc_size; + + alloc_size = sizeof(struct eeh_pe); + if (eeh_pe_aux_size) { + alloc_size = ALIGN(alloc_size, cache_line_size()); + alloc_size += eeh_pe_aux_size; + } + + /* Allocate PHB PE */ + pe = kzalloc(alloc_size, GFP_KERNEL); + if (!pe) return NULL; + + /* Initialize PHB PE */ + pe->type = type; + pe->phb = phb; + INIT_LIST_HEAD(&pe->child_list); + INIT_LIST_HEAD(&pe->edevs); + + pe->data = (void *)pe + ALIGN(sizeof(struct eeh_pe), + cache_line_size()); + return pe; +} + +/** + * eeh_phb_pe_create - Create PHB PE + * @phb: PCI controller + * + * The function should be called while the PHB is detected during + * system boot or PCI hotplug in order to create PHB PE. + */ +int eeh_phb_pe_create(struct pci_controller *phb) +{ + struct eeh_pe *pe; + + /* Allocate PHB PE */ + pe = eeh_pe_alloc(phb, EEH_PE_PHB); + if (!pe) { + pr_err("%s: out of memory!\n", __func__); + return -ENOMEM; + } + + /* Put it into the list */ + list_add_tail(&pe->child, &eeh_phb_pe); + + pr_debug("EEH: Add PE for PHB#%x\n", phb->global_number); + + return 0; +} + +/** + * eeh_wait_state - Wait for PE state + * @pe: EEH PE + * @max_wait: maximal period in millisecond + * + * Wait for the state of associated PE. It might take some time + * to retrieve the PE's state. + */ +int eeh_wait_state(struct eeh_pe *pe, int max_wait) +{ + int ret; + int mwait; + + /* + * According to PAPR, the state of PE might be temporarily + * unavailable. Under the circumstance, we have to wait + * for indicated time determined by firmware. The maximal + * wait time is 5 minutes, which is acquired from the original + * EEH implementation. Also, the original implementation + * also defined the minimal wait time as 1 second. + */ +#define EEH_STATE_MIN_WAIT_TIME (1000) +#define EEH_STATE_MAX_WAIT_TIME (300 * 1000) + + while (1) { + ret = eeh_ops->get_state(pe, &mwait); + + if (ret != EEH_STATE_UNAVAILABLE) + return ret; + + if (max_wait <= 0) { + pr_warn("%s: Timeout when getting PE's state (%d)\n", + __func__, max_wait); + return EEH_STATE_NOT_SUPPORT; + } + + if (mwait < EEH_STATE_MIN_WAIT_TIME) { + pr_warn("%s: Firmware returned bad wait value %d\n", + __func__, mwait); + mwait = EEH_STATE_MIN_WAIT_TIME; + } else if (mwait > EEH_STATE_MAX_WAIT_TIME) { + pr_warn("%s: Firmware returned too long wait value %d\n", + __func__, mwait); + mwait = EEH_STATE_MAX_WAIT_TIME; + } + + msleep(min(mwait, max_wait)); + max_wait -= mwait; + } +} + +/** + * eeh_phb_pe_get - Retrieve PHB PE based on the given PHB + * @phb: PCI controller + * + * The overall PEs form hierarchy tree. The first layer of the + * hierarchy tree is composed of PHB PEs. The function is used + * to retrieve the corresponding PHB PE according to the given PHB. + */ +struct eeh_pe *eeh_phb_pe_get(struct pci_controller *phb) +{ + struct eeh_pe *pe; + + list_for_each_entry(pe, &eeh_phb_pe, child) { + /* + * Actually, we needn't check the type since + * the PE for PHB has been determined when that + * was created. + */ + if ((pe->type & EEH_PE_PHB) && pe->phb == phb) + return pe; + } + + return NULL; +} + +/** + * eeh_pe_next - Retrieve the next PE in the tree + * @pe: current PE + * @root: root PE + * + * The function is used to retrieve the next PE in the + * hierarchy PE tree. + */ +struct eeh_pe *eeh_pe_next(struct eeh_pe *pe, struct eeh_pe *root) +{ + struct list_head *next = pe->child_list.next; + + if (next == &pe->child_list) { + while (1) { + if (pe == root) + return NULL; + next = pe->child.next; + if (next != &pe->parent->child_list) + break; + pe = pe->parent; + } + } + + return list_entry(next, struct eeh_pe, child); +} + +/** + * eeh_pe_traverse - Traverse PEs in the specified PHB + * @root: root PE + * @fn: callback + * @flag: extra parameter to callback + * + * The function is used to traverse the specified PE and its + * child PEs. The traversing is to be terminated once the + * callback returns something other than NULL, or no more PEs + * to be traversed. + */ +void *eeh_pe_traverse(struct eeh_pe *root, + eeh_pe_traverse_func fn, void *flag) +{ + struct eeh_pe *pe; + void *ret; + + eeh_for_each_pe(root, pe) { + ret = fn(pe, flag); + if (ret) return ret; + } + + return NULL; +} + +/** + * eeh_pe_dev_traverse - Traverse the devices from the PE + * @root: EEH PE + * @fn: function callback + * @flag: extra parameter to callback + * + * The function is used to traverse the devices of the specified + * PE and its child PEs. + */ +void eeh_pe_dev_traverse(struct eeh_pe *root, + eeh_edev_traverse_func fn, void *flag) +{ + struct eeh_pe *pe; + struct eeh_dev *edev, *tmp; + + if (!root) { + pr_warn("%s: Invalid PE %p\n", + __func__, root); + return; + } + + /* Traverse root PE */ + eeh_for_each_pe(root, pe) + eeh_pe_for_each_dev(pe, edev, tmp) + fn(edev, flag); +} + +/** + * __eeh_pe_get - Check the PE address + * + * For one particular PE, it can be identified by PE address + * or tranditional BDF address. BDF address is composed of + * Bus/Device/Function number. The extra data referred by flag + * indicates which type of address should be used. + */ +static void *__eeh_pe_get(struct eeh_pe *pe, void *flag) +{ + int *target_pe = flag; + + /* PHB PEs are special and should be ignored */ + if (pe->type & EEH_PE_PHB) + return NULL; + + if (*target_pe == pe->addr) + return pe; + + return NULL; +} + +/** + * eeh_pe_get - Search PE based on the given address + * @phb: PCI controller + * @pe_no: PE number + * + * Search the corresponding PE based on the specified address which + * is included in the eeh device. The function is used to check if + * the associated PE has been created against the PE address. It's + * notable that the PE address has 2 format: traditional PE address + * which is composed of PCI bus/device/function number, or unified + * PE address. + */ +struct eeh_pe *eeh_pe_get(struct pci_controller *phb, int pe_no) +{ + struct eeh_pe *root = eeh_phb_pe_get(phb); + + return eeh_pe_traverse(root, __eeh_pe_get, &pe_no); +} + +/** + * eeh_pe_tree_insert - Add EEH device to parent PE + * @edev: EEH device + * @new_pe_parent: PE to create additional PEs under + * + * Add EEH device to the PE in edev->pe_config_addr. If a PE already + * exists with that address then @edev is added to that PE. Otherwise + * a new PE is created and inserted into the PE tree as a child of + * @new_pe_parent. + * + * If @new_pe_parent is NULL then the new PE will be inserted under + * directly under the PHB. + */ +int eeh_pe_tree_insert(struct eeh_dev *edev, struct eeh_pe *new_pe_parent) +{ + struct pci_controller *hose = edev->controller; + struct eeh_pe *pe, *parent; + + /* + * Search the PE has been existing or not according + * to the PE address. If that has been existing, the + * PE should be composed of PCI bus and its subordinate + * components. + */ + pe = eeh_pe_get(hose, edev->pe_config_addr); + if (pe) { + if (pe->type & EEH_PE_INVALID) { + list_add_tail(&edev->entry, &pe->edevs); + edev->pe = pe; + /* + * We're running to here because of PCI hotplug caused by + * EEH recovery. We need clear EEH_PE_INVALID until the top. + */ + parent = pe; + while (parent) { + if (!(parent->type & EEH_PE_INVALID)) + break; + parent->type &= ~EEH_PE_INVALID; + parent = parent->parent; + } + + eeh_edev_dbg(edev, "Added to existing PE (parent: PE#%x)\n", + pe->parent->addr); + } else { + /* Mark the PE as type of PCI bus */ + pe->type = EEH_PE_BUS; + edev->pe = pe; + + /* Put the edev to PE */ + list_add_tail(&edev->entry, &pe->edevs); + eeh_edev_dbg(edev, "Added to bus PE\n"); + } + return 0; + } + + /* Create a new EEH PE */ + if (edev->physfn) + pe = eeh_pe_alloc(hose, EEH_PE_VF); + else + pe = eeh_pe_alloc(hose, EEH_PE_DEVICE); + if (!pe) { + pr_err("%s: out of memory!\n", __func__); + return -ENOMEM; + } + + pe->addr = edev->pe_config_addr; + + /* + * Put the new EEH PE into hierarchy tree. If the parent + * can't be found, the newly created PE will be attached + * to PHB directly. Otherwise, we have to associate the + * PE with its parent. + */ + if (!new_pe_parent) { + new_pe_parent = eeh_phb_pe_get(hose); + if (!new_pe_parent) { + pr_err("%s: No PHB PE is found (PHB Domain=%d)\n", + __func__, hose->global_number); + edev->pe = NULL; + kfree(pe); + return -EEXIST; + } + } + + /* link new PE into the tree */ + pe->parent = new_pe_parent; + list_add_tail(&pe->child, &new_pe_parent->child_list); + + /* + * Put the newly created PE into the child list and + * link the EEH device accordingly. + */ + list_add_tail(&edev->entry, &pe->edevs); + edev->pe = pe; + eeh_edev_dbg(edev, "Added to new (parent: PE#%x)\n", + new_pe_parent->addr); + + return 0; +} + +/** + * eeh_pe_tree_remove - Remove one EEH device from the associated PE + * @edev: EEH device + * + * The PE hierarchy tree might be changed when doing PCI hotplug. + * Also, the PCI devices or buses could be removed from the system + * during EEH recovery. So we have to call the function remove the + * corresponding PE accordingly if necessary. + */ +int eeh_pe_tree_remove(struct eeh_dev *edev) +{ + struct eeh_pe *pe, *parent, *child; + bool keep, recover; + int cnt; + + pe = eeh_dev_to_pe(edev); + if (!pe) { + eeh_edev_dbg(edev, "No PE found for device.\n"); + return -EEXIST; + } + + /* Remove the EEH device */ + edev->pe = NULL; + list_del(&edev->entry); + + /* + * Check if the parent PE includes any EEH devices. + * If not, we should delete that. Also, we should + * delete the parent PE if it doesn't have associated + * child PEs and EEH devices. + */ + while (1) { + parent = pe->parent; + + /* PHB PEs should never be removed */ + if (pe->type & EEH_PE_PHB) + break; + + /* + * XXX: KEEP is set while resetting a PE. I don't think it's + * ever set without RECOVERING also being set. I could + * be wrong though so catch that with a WARN. + */ + keep = !!(pe->state & EEH_PE_KEEP); + recover = !!(pe->state & EEH_PE_RECOVERING); + WARN_ON(keep && !recover); + + if (!keep && !recover) { + if (list_empty(&pe->edevs) && + list_empty(&pe->child_list)) { + list_del(&pe->child); + kfree(pe); + } else { + break; + } + } else { + /* + * Mark the PE as invalid. At the end of the recovery + * process any invalid PEs will be garbage collected. + * + * We need to delay the free()ing of them since we can + * remove edev's while traversing the PE tree which + * might trigger the removal of a PE and we can't + * deal with that (yet). + */ + if (list_empty(&pe->edevs)) { + cnt = 0; + list_for_each_entry(child, &pe->child_list, child) { + if (!(child->type & EEH_PE_INVALID)) { + cnt++; + break; + } + } + + if (!cnt) + pe->type |= EEH_PE_INVALID; + else + break; + } + } + + pe = parent; + } + + return 0; +} + +/** + * eeh_pe_update_time_stamp - Update PE's frozen time stamp + * @pe: EEH PE + * + * We have time stamp for each PE to trace its time of getting + * frozen in last hour. The function should be called to update + * the time stamp on first error of the specific PE. On the other + * handle, we needn't account for errors happened in last hour. + */ +void eeh_pe_update_time_stamp(struct eeh_pe *pe) +{ + time64_t tstamp; + + if (!pe) return; + + if (pe->freeze_count <= 0) { + pe->freeze_count = 0; + pe->tstamp = ktime_get_seconds(); + } else { + tstamp = ktime_get_seconds(); + if (tstamp - pe->tstamp > 3600) { + pe->tstamp = tstamp; + pe->freeze_count = 0; + } + } +} + +/** + * eeh_pe_state_mark - Mark specified state for PE and its associated device + * @pe: EEH PE + * + * EEH error affects the current PE and its child PEs. The function + * is used to mark appropriate state for the affected PEs and the + * associated devices. + */ +void eeh_pe_state_mark(struct eeh_pe *root, int state) +{ + struct eeh_pe *pe; + + eeh_for_each_pe(root, pe) + if (!(pe->state & EEH_PE_REMOVED)) + pe->state |= state; +} +EXPORT_SYMBOL_GPL(eeh_pe_state_mark); + +/** + * eeh_pe_mark_isolated + * @pe: EEH PE + * + * Record that a PE has been isolated by marking the PE and it's children as + * EEH_PE_ISOLATED (and EEH_PE_CFG_BLOCKED, if required) and their PCI devices + * as pci_channel_io_frozen. + */ +void eeh_pe_mark_isolated(struct eeh_pe *root) +{ + struct eeh_pe *pe; + struct eeh_dev *edev; + struct pci_dev *pdev; + + eeh_pe_state_mark(root, EEH_PE_ISOLATED); + eeh_for_each_pe(root, pe) { + list_for_each_entry(edev, &pe->edevs, entry) { + pdev = eeh_dev_to_pci_dev(edev); + if (pdev) + pdev->error_state = pci_channel_io_frozen; + } + /* Block PCI config access if required */ + if (pe->state & EEH_PE_CFG_RESTRICTED) + pe->state |= EEH_PE_CFG_BLOCKED; + } +} +EXPORT_SYMBOL_GPL(eeh_pe_mark_isolated); + +static void __eeh_pe_dev_mode_mark(struct eeh_dev *edev, void *flag) +{ + int mode = *((int *)flag); + + edev->mode |= mode; +} + +/** + * eeh_pe_dev_state_mark - Mark state for all device under the PE + * @pe: EEH PE + * + * Mark specific state for all child devices of the PE. + */ +void eeh_pe_dev_mode_mark(struct eeh_pe *pe, int mode) +{ + eeh_pe_dev_traverse(pe, __eeh_pe_dev_mode_mark, &mode); +} + +/** + * eeh_pe_state_clear - Clear state for the PE + * @data: EEH PE + * @state: state + * @include_passed: include passed-through devices? + * + * The function is used to clear the indicated state from the + * given PE. Besides, we also clear the check count of the PE + * as well. + */ +void eeh_pe_state_clear(struct eeh_pe *root, int state, bool include_passed) +{ + struct eeh_pe *pe; + struct eeh_dev *edev, *tmp; + struct pci_dev *pdev; + + eeh_for_each_pe(root, pe) { + /* Keep the state of permanently removed PE intact */ + if (pe->state & EEH_PE_REMOVED) + continue; + + if (!include_passed && eeh_pe_passed(pe)) + continue; + + pe->state &= ~state; + + /* + * Special treatment on clearing isolated state. Clear + * check count since last isolation and put all affected + * devices to normal state. + */ + if (!(state & EEH_PE_ISOLATED)) + continue; + + pe->check_count = 0; + eeh_pe_for_each_dev(pe, edev, tmp) { + pdev = eeh_dev_to_pci_dev(edev); + if (!pdev) + continue; + + pdev->error_state = pci_channel_io_normal; + } + + /* Unblock PCI config access if required */ + if (pe->state & EEH_PE_CFG_RESTRICTED) + pe->state &= ~EEH_PE_CFG_BLOCKED; + } +} + +/* + * Some PCI bridges (e.g. PLX bridges) have primary/secondary + * buses assigned explicitly by firmware, and we probably have + * lost that after reset. So we have to delay the check until + * the PCI-CFG registers have been restored for the parent + * bridge. + * + * Don't use normal PCI-CFG accessors, which probably has been + * blocked on normal path during the stage. So we need utilize + * eeh operations, which is always permitted. + */ +static void eeh_bridge_check_link(struct eeh_dev *edev) +{ + int cap; + uint32_t val; + int timeout = 0; + + /* + * We only check root port and downstream ports of + * PCIe switches + */ + if (!(edev->mode & (EEH_DEV_ROOT_PORT | EEH_DEV_DS_PORT))) + return; + + eeh_edev_dbg(edev, "Checking PCIe link...\n"); + + /* Check slot status */ + cap = edev->pcie_cap; + eeh_ops->read_config(edev, cap + PCI_EXP_SLTSTA, 2, &val); + if (!(val & PCI_EXP_SLTSTA_PDS)) { + eeh_edev_dbg(edev, "No card in the slot (0x%04x) !\n", val); + return; + } + + /* Check power status if we have the capability */ + eeh_ops->read_config(edev, cap + PCI_EXP_SLTCAP, 2, &val); + if (val & PCI_EXP_SLTCAP_PCP) { + eeh_ops->read_config(edev, cap + PCI_EXP_SLTCTL, 2, &val); + if (val & PCI_EXP_SLTCTL_PCC) { + eeh_edev_dbg(edev, "In power-off state, power it on ...\n"); + val &= ~(PCI_EXP_SLTCTL_PCC | PCI_EXP_SLTCTL_PIC); + val |= (0x0100 & PCI_EXP_SLTCTL_PIC); + eeh_ops->write_config(edev, cap + PCI_EXP_SLTCTL, 2, val); + msleep(2 * 1000); + } + } + + /* Enable link */ + eeh_ops->read_config(edev, cap + PCI_EXP_LNKCTL, 2, &val); + val &= ~PCI_EXP_LNKCTL_LD; + eeh_ops->write_config(edev, cap + PCI_EXP_LNKCTL, 2, val); + + /* Check link */ + eeh_ops->read_config(edev, cap + PCI_EXP_LNKCAP, 4, &val); + if (!(val & PCI_EXP_LNKCAP_DLLLARC)) { + eeh_edev_dbg(edev, "No link reporting capability (0x%08x) \n", val); + msleep(1000); + return; + } + + /* Wait the link is up until timeout (5s) */ + timeout = 0; + while (timeout < 5000) { + msleep(20); + timeout += 20; + + eeh_ops->read_config(edev, cap + PCI_EXP_LNKSTA, 2, &val); + if (val & PCI_EXP_LNKSTA_DLLLA) + break; + } + + if (val & PCI_EXP_LNKSTA_DLLLA) + eeh_edev_dbg(edev, "Link up (%s)\n", + (val & PCI_EXP_LNKSTA_CLS_2_5GB) ? "2.5GB" : "5GB"); + else + eeh_edev_dbg(edev, "Link not ready (0x%04x)\n", val); +} + +#define BYTE_SWAP(OFF) (8*((OFF)/4)+3-(OFF)) +#define SAVED_BYTE(OFF) (((u8 *)(edev->config_space))[BYTE_SWAP(OFF)]) + +static void eeh_restore_bridge_bars(struct eeh_dev *edev) +{ + int i; + + /* + * Device BARs: 0x10 - 0x18 + * Bus numbers and windows: 0x18 - 0x30 + */ + for (i = 4; i < 13; i++) + eeh_ops->write_config(edev, i*4, 4, edev->config_space[i]); + /* Rom: 0x38 */ + eeh_ops->write_config(edev, 14*4, 4, edev->config_space[14]); + + /* Cache line & Latency timer: 0xC 0xD */ + eeh_ops->write_config(edev, PCI_CACHE_LINE_SIZE, 1, + SAVED_BYTE(PCI_CACHE_LINE_SIZE)); + eeh_ops->write_config(edev, PCI_LATENCY_TIMER, 1, + SAVED_BYTE(PCI_LATENCY_TIMER)); + /* Max latency, min grant, interrupt ping and line: 0x3C */ + eeh_ops->write_config(edev, 15*4, 4, edev->config_space[15]); + + /* PCI Command: 0x4 */ + eeh_ops->write_config(edev, PCI_COMMAND, 4, edev->config_space[1] | + PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER); + + /* Check the PCIe link is ready */ + eeh_bridge_check_link(edev); +} + +static void eeh_restore_device_bars(struct eeh_dev *edev) +{ + int i; + u32 cmd; + + for (i = 4; i < 10; i++) + eeh_ops->write_config(edev, i*4, 4, edev->config_space[i]); + /* 12 == Expansion ROM Address */ + eeh_ops->write_config(edev, 12*4, 4, edev->config_space[12]); + + eeh_ops->write_config(edev, PCI_CACHE_LINE_SIZE, 1, + SAVED_BYTE(PCI_CACHE_LINE_SIZE)); + eeh_ops->write_config(edev, PCI_LATENCY_TIMER, 1, + SAVED_BYTE(PCI_LATENCY_TIMER)); + + /* max latency, min grant, interrupt pin and line */ + eeh_ops->write_config(edev, 15*4, 4, edev->config_space[15]); + + /* + * Restore PERR & SERR bits, some devices require it, + * don't touch the other command bits + */ + eeh_ops->read_config(edev, PCI_COMMAND, 4, &cmd); + if (edev->config_space[1] & PCI_COMMAND_PARITY) + cmd |= PCI_COMMAND_PARITY; + else + cmd &= ~PCI_COMMAND_PARITY; + if (edev->config_space[1] & PCI_COMMAND_SERR) + cmd |= PCI_COMMAND_SERR; + else + cmd &= ~PCI_COMMAND_SERR; + eeh_ops->write_config(edev, PCI_COMMAND, 4, cmd); +} + +/** + * eeh_restore_one_device_bars - Restore the Base Address Registers for one device + * @data: EEH device + * @flag: Unused + * + * Loads the PCI configuration space base address registers, + * the expansion ROM base address, the latency timer, and etc. + * from the saved values in the device node. + */ +static void eeh_restore_one_device_bars(struct eeh_dev *edev, void *flag) +{ + /* Do special restore for bridges */ + if (edev->mode & EEH_DEV_BRIDGE) + eeh_restore_bridge_bars(edev); + else + eeh_restore_device_bars(edev); + + if (eeh_ops->restore_config) + eeh_ops->restore_config(edev); +} + +/** + * eeh_pe_restore_bars - Restore the PCI config space info + * @pe: EEH PE + * + * This routine performs a recursive walk to the children + * of this device as well. + */ +void eeh_pe_restore_bars(struct eeh_pe *pe) +{ + /* + * We needn't take the EEH lock since eeh_pe_dev_traverse() + * will take that. + */ + eeh_pe_dev_traverse(pe, eeh_restore_one_device_bars, NULL); +} + +/** + * eeh_pe_loc_get - Retrieve location code binding to the given PE + * @pe: EEH PE + * + * Retrieve the location code of the given PE. If the primary PE bus + * is root bus, we will grab location code from PHB device tree node + * or root port. Otherwise, the upstream bridge's device tree node + * of the primary PE bus will be checked for the location code. + */ +const char *eeh_pe_loc_get(struct eeh_pe *pe) +{ + struct pci_bus *bus = eeh_pe_bus_get(pe); + struct device_node *dn; + const char *loc = NULL; + + while (bus) { + dn = pci_bus_to_OF_node(bus); + if (!dn) { + bus = bus->parent; + continue; + } + + if (pci_is_root_bus(bus)) + loc = of_get_property(dn, "ibm,io-base-loc-code", NULL); + else + loc = of_get_property(dn, "ibm,slot-location-code", + NULL); + + if (loc) + return loc; + + bus = bus->parent; + } + + return "N/A"; +} + +/** + * eeh_pe_bus_get - Retrieve PCI bus according to the given PE + * @pe: EEH PE + * + * Retrieve the PCI bus according to the given PE. Basically, + * there're 3 types of PEs: PHB/Bus/Device. For PHB PE, the + * primary PCI bus will be retrieved. The parent bus will be + * returned for BUS PE. However, we don't have associated PCI + * bus for DEVICE PE. + */ +struct pci_bus *eeh_pe_bus_get(struct eeh_pe *pe) +{ + struct eeh_dev *edev; + struct pci_dev *pdev; + + if (pe->type & EEH_PE_PHB) + return pe->phb->bus; + + /* The primary bus might be cached during probe time */ + if (pe->state & EEH_PE_PRI_BUS) + return pe->bus; + + /* Retrieve the parent PCI bus of first (top) PCI device */ + edev = list_first_entry_or_null(&pe->edevs, struct eeh_dev, entry); + pdev = eeh_dev_to_pci_dev(edev); + if (pdev) + return pdev->bus; + + return NULL; +} diff --git a/arch/powerpc/kernel/eeh_sysfs.c b/arch/powerpc/kernel/eeh_sysfs.c new file mode 100644 index 000000000..706e1eb95 --- /dev/null +++ b/arch/powerpc/kernel/eeh_sysfs.c @@ -0,0 +1,182 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Sysfs entries for PCI Error Recovery for PAPR-compliant platform. + * Copyright IBM Corporation 2007 + * Copyright Linas Vepstas <linas@austin.ibm.com> 2007 + * + * Send comments and feedback to Linas Vepstas <linas@austin.ibm.com> + */ +#include <linux/of.h> +#include <linux/pci.h> +#include <linux/stat.h> +#include <asm/ppc-pci.h> +#include <asm/pci-bridge.h> + +/** + * EEH_SHOW_ATTR -- Create sysfs entry for eeh statistic + * @_name: name of file in sysfs directory + * @_memb: name of member in struct eeh_dev to access + * @_format: printf format for display + * + * All of the attributes look very similar, so just + * auto-gen a cut-n-paste routine to display them. + */ +#define EEH_SHOW_ATTR(_name,_memb,_format) \ +static ssize_t eeh_show_##_name(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + struct pci_dev *pdev = to_pci_dev(dev); \ + struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); \ + \ + if (!edev) \ + return 0; \ + \ + return sprintf(buf, _format "\n", edev->_memb); \ +} \ +static DEVICE_ATTR(_name, 0444, eeh_show_##_name, NULL); + +EEH_SHOW_ATTR(eeh_mode, mode, "0x%x"); +EEH_SHOW_ATTR(eeh_pe_config_addr, pe_config_addr, "0x%x"); + +static ssize_t eeh_pe_state_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); + int state; + + if (!edev || !edev->pe) + return -ENODEV; + + state = eeh_ops->get_state(edev->pe, NULL); + return sprintf(buf, "0x%08x 0x%08x\n", + state, edev->pe->state); +} + +static ssize_t eeh_pe_state_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); + + if (!edev || !edev->pe) + return -ENODEV; + + /* Nothing to do if it's not frozen */ + if (!(edev->pe->state & EEH_PE_ISOLATED)) + return count; + + if (eeh_unfreeze_pe(edev->pe)) + return -EIO; + eeh_pe_state_clear(edev->pe, EEH_PE_ISOLATED, true); + + return count; +} + +static DEVICE_ATTR_RW(eeh_pe_state); + +#if defined(CONFIG_PCI_IOV) && defined(CONFIG_PPC_PSERIES) +static ssize_t eeh_notify_resume_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); + struct pci_dn *pdn = pci_get_pdn(pdev); + + if (!edev || !edev->pe) + return -ENODEV; + + return sprintf(buf, "%d\n", pdn->last_allow_rc); +} + +static ssize_t eeh_notify_resume_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); + + if (!edev || !edev->pe || !eeh_ops->notify_resume) + return -ENODEV; + + if (eeh_ops->notify_resume(edev)) + return -EIO; + + return count; +} +static DEVICE_ATTR_RW(eeh_notify_resume); + +static int eeh_notify_resume_add(struct pci_dev *pdev) +{ + struct device_node *np; + int rc = 0; + + np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn); + + if (of_property_read_bool(np, "ibm,is-open-sriov-pf")) + rc = device_create_file(&pdev->dev, &dev_attr_eeh_notify_resume); + + return rc; +} + +static void eeh_notify_resume_remove(struct pci_dev *pdev) +{ + struct device_node *np; + + np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn); + + if (of_property_read_bool(np, "ibm,is-open-sriov-pf")) + device_remove_file(&pdev->dev, &dev_attr_eeh_notify_resume); +} +#else +static inline int eeh_notify_resume_add(struct pci_dev *pdev) { return 0; } +static inline void eeh_notify_resume_remove(struct pci_dev *pdev) { } +#endif /* CONFIG_PCI_IOV && CONFIG PPC_PSERIES*/ + +void eeh_sysfs_add_device(struct pci_dev *pdev) +{ + struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); + int rc=0; + + if (!eeh_enabled()) + return; + + if (edev && (edev->mode & EEH_DEV_SYSFS)) + return; + + rc += device_create_file(&pdev->dev, &dev_attr_eeh_mode); + rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_config_addr); + rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_state); + rc += eeh_notify_resume_add(pdev); + + if (rc) + pr_warn("EEH: Unable to create sysfs entries\n"); + else if (edev) + edev->mode |= EEH_DEV_SYSFS; +} + +void eeh_sysfs_remove_device(struct pci_dev *pdev) +{ + struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); + + if (!edev) { + WARN_ON(eeh_enabled()); + return; + } + + edev->mode &= ~EEH_DEV_SYSFS; + + /* + * The parent directory might have been removed. We needn't + * continue for that case. + */ + if (!pdev->dev.kobj.sd) + return; + + device_remove_file(&pdev->dev, &dev_attr_eeh_mode); + device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr); + device_remove_file(&pdev->dev, &dev_attr_eeh_pe_state); + + eeh_notify_resume_remove(pdev); +} diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S new file mode 100644 index 000000000..d4fc54676 --- /dev/null +++ b/arch/powerpc/kernel/entry_32.S @@ -0,0 +1,553 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * PowerPC version + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * Rewritten by Cort Dougan (cort@fsmlabs.com) for PReP + * Copyright (C) 1996 Cort Dougan <cort@fsmlabs.com> + * Adapted for Power Macintosh by Paul Mackerras. + * Low-level exception handlers and MMU support + * rewritten by Paul Mackerras. + * Copyright (C) 1996 Paul Mackerras. + * MPC8xx modifications Copyright (C) 1997 Dan Malek (dmalek@jlc.net). + * + * This file contains the system call entry code, context switch + * code, and exception/interrupt return code for PowerPC. + */ + +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/sys.h> +#include <linux/threads.h> +#include <asm/reg.h> +#include <asm/page.h> +#include <asm/mmu.h> +#include <asm/cputable.h> +#include <asm/thread_info.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/unistd.h> +#include <asm/ptrace.h> +#include <asm/export.h> +#include <asm/feature-fixups.h> +#include <asm/barrier.h> +#include <asm/kup.h> +#include <asm/bug.h> +#include <asm/interrupt.h> + +#include "head_32.h" + +/* + * powerpc relies on return from interrupt/syscall being context synchronising + * (which rfi is) to support ARCH_HAS_MEMBARRIER_SYNC_CORE without additional + * synchronisation instructions. + */ + +/* + * Align to 4k in order to ensure that all functions modyfing srr0/srr1 + * fit into one page in order to not encounter a TLB miss between the + * modification of srr0/srr1 and the associated rfi. + */ + .align 12 + +#if defined(CONFIG_PPC_BOOK3S_32) || defined(CONFIG_PPC_E500) + .globl prepare_transfer_to_handler +prepare_transfer_to_handler: + /* if from kernel, check interrupted DOZE/NAP mode */ + lwz r12,TI_LOCAL_FLAGS(r2) + mtcrf 0x01,r12 + bt- 31-TLF_NAPPING,4f + bt- 31-TLF_SLEEPING,7f + blr + +4: rlwinm r12,r12,0,~_TLF_NAPPING + stw r12,TI_LOCAL_FLAGS(r2) + b power_save_ppc32_restore + +7: rlwinm r12,r12,0,~_TLF_SLEEPING + stw r12,TI_LOCAL_FLAGS(r2) + lwz r9,_MSR(r11) /* if sleeping, clear MSR.EE */ + rlwinm r9,r9,0,~MSR_EE + lwz r12,_LINK(r11) /* and return to address in LR */ + REST_GPR(2, r11) + b fast_exception_return +_ASM_NOKPROBE_SYMBOL(prepare_transfer_to_handler) +#endif /* CONFIG_PPC_BOOK3S_32 || CONFIG_PPC_E500 */ + +#if defined(CONFIG_PPC_KUEP) && defined(CONFIG_PPC_BOOK3S_32) + .globl __kuep_lock +__kuep_lock: + lwz r9, THREAD+THSR0(r2) + update_user_segments_by_4 r9, r10, r11, r12 + blr + +__kuep_unlock: + lwz r9, THREAD+THSR0(r2) + rlwinm r9,r9,0,~SR_NX + update_user_segments_by_4 r9, r10, r11, r12 + blr + +.macro kuep_lock + bl __kuep_lock +.endm +.macro kuep_unlock + bl __kuep_unlock +.endm +#else +.macro kuep_lock +.endm +.macro kuep_unlock +.endm +#endif + + .globl transfer_to_syscall +transfer_to_syscall: + stw r3, ORIG_GPR3(r1) + stw r11, GPR1(r1) + stw r11, 0(r1) + mflr r12 + stw r12, _LINK(r1) +#ifdef CONFIG_BOOKE_OR_40x + rlwinm r9,r9,0,14,12 /* clear MSR_WE (necessary?) */ +#endif + lis r12,STACK_FRAME_REGS_MARKER@ha /* exception frame marker */ + SAVE_GPR(2, r1) + addi r12,r12,STACK_FRAME_REGS_MARKER@l + stw r9,_MSR(r1) + li r2, INTERRUPT_SYSCALL + stw r12,8(r1) + stw r2,_TRAP(r1) + SAVE_GPR(0, r1) + SAVE_GPRS(3, 8, r1) + addi r2,r10,-THREAD + SAVE_NVGPRS(r1) + kuep_lock + + /* Calling convention has r3 = regs, r4 = orig r0 */ + addi r3,r1,STACK_FRAME_OVERHEAD + mr r4,r0 + bl system_call_exception + +ret_from_syscall: + addi r4,r1,STACK_FRAME_OVERHEAD + li r5,0 + bl syscall_exit_prepare +#ifdef CONFIG_PPC_47x + lis r4,icache_44x_need_flush@ha + lwz r5,icache_44x_need_flush@l(r4) + cmplwi cr0,r5,0 + bne- .L44x_icache_flush +#endif /* CONFIG_PPC_47x */ +.L44x_icache_flush_return: + kuep_unlock + lwz r4,_LINK(r1) + lwz r5,_CCR(r1) + mtlr r4 + lwz r7,_NIP(r1) + lwz r8,_MSR(r1) + cmpwi r3,0 + REST_GPR(3, r1) +syscall_exit_finish: + mtspr SPRN_SRR0,r7 + mtspr SPRN_SRR1,r8 + + bne 3f + mtcr r5 + +1: REST_GPR(2, r1) + REST_GPR(1, r1) + rfi +#ifdef CONFIG_40x + b . /* Prevent prefetch past rfi */ +#endif + +3: mtcr r5 + lwz r4,_CTR(r1) + lwz r5,_XER(r1) + REST_NVGPRS(r1) + mtctr r4 + mtxer r5 + REST_GPR(0, r1) + REST_GPRS(3, 12, r1) + b 1b + +#ifdef CONFIG_44x +.L44x_icache_flush: + li r7,0 + iccci r0,r0 + stw r7,icache_44x_need_flush@l(r4) + b .L44x_icache_flush_return +#endif /* CONFIG_44x */ + + .globl ret_from_fork +ret_from_fork: + REST_NVGPRS(r1) + bl schedule_tail + li r3,0 + b ret_from_syscall + + .globl ret_from_kernel_thread +ret_from_kernel_thread: + REST_NVGPRS(r1) + bl schedule_tail + mtctr r14 + mr r3,r15 + PPC440EP_ERR42 + bctrl + li r3,0 + b ret_from_syscall + +/* + * This routine switches between two different tasks. The process + * state of one is saved on its kernel stack. Then the state + * of the other is restored from its kernel stack. The memory + * management hardware is updated to the second process's state. + * Finally, we can return to the second process. + * On entry, r3 points to the THREAD for the current task, r4 + * points to the THREAD for the new task. + * + * This routine is always called with interrupts disabled. + * + * Note: there are two ways to get to the "going out" portion + * of this code; either by coming in via the entry (_switch) + * or via "fork" which must set up an environment equivalent + * to the "_switch" path. If you change this , you'll have to + * change the fork code also. + * + * The code which creates the new task context is in 'copy_thread' + * in arch/ppc/kernel/process.c + */ +_GLOBAL(_switch) + stwu r1,-INT_FRAME_SIZE(r1) + mflr r0 + stw r0,INT_FRAME_SIZE+4(r1) + /* r3-r12 are caller saved -- Cort */ + SAVE_NVGPRS(r1) + stw r0,_NIP(r1) /* Return to switch caller */ + mfcr r10 + stw r10,_CCR(r1) + stw r1,KSP(r3) /* Set old stack pointer */ + +#ifdef CONFIG_SMP + /* We need a sync somewhere here to make sure that if the + * previous task gets rescheduled on another CPU, it sees all + * stores it has performed on this one. + */ + sync +#endif /* CONFIG_SMP */ + + tophys(r0,r4) + mtspr SPRN_SPRG_THREAD,r0 /* Update current THREAD phys addr */ + lwz r1,KSP(r4) /* Load new stack pointer */ + + /* save the old current 'last' for return value */ + mr r3,r2 + addi r2,r4,-THREAD /* Update current */ + + lwz r0,_CCR(r1) + mtcrf 0xFF,r0 + /* r3-r12 are destroyed -- Cort */ + REST_NVGPRS(r1) + + lwz r4,_NIP(r1) /* Return to _switch caller in new task */ + mtlr r4 + addi r1,r1,INT_FRAME_SIZE + blr + + .globl fast_exception_return +fast_exception_return: +#if !(defined(CONFIG_4xx) || defined(CONFIG_BOOKE)) + andi. r10,r9,MSR_RI /* check for recoverable interrupt */ + beq 3f /* if not, we've got problems */ +#endif + +2: lwz r10,_CCR(r11) + REST_GPRS(1, 6, r11) + mtcr r10 + lwz r10,_LINK(r11) + mtlr r10 + /* Clear the exception marker on the stack to avoid confusing stacktrace */ + li r10, 0 + stw r10, 8(r11) + REST_GPR(10, r11) +#if defined(CONFIG_PPC_8xx) && defined(CONFIG_PERF_EVENTS) + mtspr SPRN_NRI, r0 +#endif + mtspr SPRN_SRR1,r9 + mtspr SPRN_SRR0,r12 + REST_GPR(9, r11) + REST_GPR(12, r11) + REST_GPR(11, r11) + rfi +#ifdef CONFIG_40x + b . /* Prevent prefetch past rfi */ +#endif +_ASM_NOKPROBE_SYMBOL(fast_exception_return) + +/* aargh, a nonrecoverable interrupt, panic */ +/* aargh, we don't know which trap this is */ +3: + li r10,-1 + stw r10,_TRAP(r11) + prepare_transfer_to_handler + bl unrecoverable_exception + trap /* should not get here */ + + .globl interrupt_return +interrupt_return: + lwz r4,_MSR(r1) + addi r3,r1,STACK_FRAME_OVERHEAD + andi. r0,r4,MSR_PR + beq .Lkernel_interrupt_return + bl interrupt_exit_user_prepare + cmpwi r3,0 + kuep_unlock + bne- .Lrestore_nvgprs + +.Lfast_user_interrupt_return: + lwz r11,_NIP(r1) + lwz r12,_MSR(r1) + mtspr SPRN_SRR0,r11 + mtspr SPRN_SRR1,r12 + +BEGIN_FTR_SECTION + stwcx. r0,0,r1 /* to clear the reservation */ +FTR_SECTION_ELSE + lwarx r0,0,r1 +ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) + + lwz r3,_CCR(r1) + lwz r4,_LINK(r1) + lwz r5,_CTR(r1) + lwz r6,_XER(r1) + li r0,0 + + /* + * Leaving a stale exception marker on the stack can confuse + * the reliable stack unwinder later on. Clear it. + */ + stw r0,8(r1) + REST_GPRS(7, 12, r1) + + mtcr r3 + mtlr r4 + mtctr r5 + mtspr SPRN_XER,r6 + + REST_GPRS(2, 6, r1) + REST_GPR(0, r1) + REST_GPR(1, r1) + rfi +#ifdef CONFIG_40x + b . /* Prevent prefetch past rfi */ +#endif + +.Lrestore_nvgprs: + REST_NVGPRS(r1) + b .Lfast_user_interrupt_return + +.Lkernel_interrupt_return: + bl interrupt_exit_kernel_prepare + +.Lfast_kernel_interrupt_return: + cmpwi cr1,r3,0 + lwz r11,_NIP(r1) + lwz r12,_MSR(r1) + mtspr SPRN_SRR0,r11 + mtspr SPRN_SRR1,r12 + +BEGIN_FTR_SECTION + stwcx. r0,0,r1 /* to clear the reservation */ +FTR_SECTION_ELSE + lwarx r0,0,r1 +ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) + + lwz r3,_LINK(r1) + lwz r4,_CTR(r1) + lwz r5,_XER(r1) + lwz r6,_CCR(r1) + li r0,0 + + REST_GPRS(7, 12, r1) + + mtlr r3 + mtctr r4 + mtspr SPRN_XER,r5 + + /* + * Leaving a stale exception marker on the stack can confuse + * the reliable stack unwinder later on. Clear it. + */ + stw r0,8(r1) + + REST_GPRS(2, 5, r1) + + bne- cr1,1f /* emulate stack store */ + mtcr r6 + REST_GPR(6, r1) + REST_GPR(0, r1) + REST_GPR(1, r1) + rfi +#ifdef CONFIG_40x + b . /* Prevent prefetch past rfi */ +#endif + +1: /* + * Emulate stack store with update. New r1 value was already calculated + * and updated in our interrupt regs by emulate_loadstore, but we can't + * store the previous value of r1 to the stack before re-loading our + * registers from it, otherwise they could be clobbered. Use + * SPRG Scratch0 as temporary storage to hold the store + * data, as interrupts are disabled here so it won't be clobbered. + */ + mtcr r6 +#ifdef CONFIG_BOOKE + mtspr SPRN_SPRG_WSCRATCH0, r9 +#else + mtspr SPRN_SPRG_SCRATCH0, r9 +#endif + addi r9,r1,INT_FRAME_SIZE /* get original r1 */ + REST_GPR(6, r1) + REST_GPR(0, r1) + REST_GPR(1, r1) + stw r9,0(r1) /* perform store component of stwu */ +#ifdef CONFIG_BOOKE + mfspr r9, SPRN_SPRG_RSCRATCH0 +#else + mfspr r9, SPRN_SPRG_SCRATCH0 +#endif + rfi +#ifdef CONFIG_40x + b . /* Prevent prefetch past rfi */ +#endif +_ASM_NOKPROBE_SYMBOL(interrupt_return) + +#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) + +/* + * Returning from a critical interrupt in user mode doesn't need + * to be any different from a normal exception. For a critical + * interrupt in the kernel, we just return (without checking for + * preemption) since the interrupt may have happened at some crucial + * place (e.g. inside the TLB miss handler), and because we will be + * running with r1 pointing into critical_stack, not the current + * process's kernel stack (and therefore current_thread_info() will + * give the wrong answer). + * We have to restore various SPRs that may have been in use at the + * time of the critical interrupt. + * + */ +#ifdef CONFIG_40x +#define PPC_40x_TURN_OFF_MSR_DR \ + /* avoid any possible TLB misses here by turning off MSR.DR, we \ + * assume the instructions here are mapped by a pinned TLB entry */ \ + li r10,MSR_IR; \ + mtmsr r10; \ + isync; \ + tophys(r1, r1); +#else +#define PPC_40x_TURN_OFF_MSR_DR +#endif + +#define RET_FROM_EXC_LEVEL(exc_lvl_srr0, exc_lvl_srr1, exc_lvl_rfi) \ + REST_NVGPRS(r1); \ + lwz r3,_MSR(r1); \ + andi. r3,r3,MSR_PR; \ + bne interrupt_return; \ + REST_GPR(0, r1); \ + REST_GPRS(2, 8, r1); \ + lwz r10,_XER(r1); \ + lwz r11,_CTR(r1); \ + mtspr SPRN_XER,r10; \ + mtctr r11; \ + stwcx. r0,0,r1; /* to clear the reservation */ \ + lwz r11,_LINK(r1); \ + mtlr r11; \ + lwz r10,_CCR(r1); \ + mtcrf 0xff,r10; \ + PPC_40x_TURN_OFF_MSR_DR; \ + lwz r9,_DEAR(r1); \ + lwz r10,_ESR(r1); \ + mtspr SPRN_DEAR,r9; \ + mtspr SPRN_ESR,r10; \ + lwz r11,_NIP(r1); \ + lwz r12,_MSR(r1); \ + mtspr exc_lvl_srr0,r11; \ + mtspr exc_lvl_srr1,r12; \ + REST_GPRS(9, 12, r1); \ + REST_GPR(1, r1); \ + exc_lvl_rfi; \ + b .; /* prevent prefetch past exc_lvl_rfi */ + +#define RESTORE_xSRR(exc_lvl_srr0, exc_lvl_srr1) \ + lwz r9,_##exc_lvl_srr0(r1); \ + lwz r10,_##exc_lvl_srr1(r1); \ + mtspr SPRN_##exc_lvl_srr0,r9; \ + mtspr SPRN_##exc_lvl_srr1,r10; + +#if defined(CONFIG_PPC_E500) +#ifdef CONFIG_PHYS_64BIT +#define RESTORE_MAS7 \ + lwz r11,MAS7(r1); \ + mtspr SPRN_MAS7,r11; +#else +#define RESTORE_MAS7 +#endif /* CONFIG_PHYS_64BIT */ +#define RESTORE_MMU_REGS \ + lwz r9,MAS0(r1); \ + lwz r10,MAS1(r1); \ + lwz r11,MAS2(r1); \ + mtspr SPRN_MAS0,r9; \ + lwz r9,MAS3(r1); \ + mtspr SPRN_MAS1,r10; \ + lwz r10,MAS6(r1); \ + mtspr SPRN_MAS2,r11; \ + mtspr SPRN_MAS3,r9; \ + mtspr SPRN_MAS6,r10; \ + RESTORE_MAS7; +#elif defined(CONFIG_44x) +#define RESTORE_MMU_REGS \ + lwz r9,MMUCR(r1); \ + mtspr SPRN_MMUCR,r9; +#else +#define RESTORE_MMU_REGS +#endif + +#ifdef CONFIG_40x + .globl ret_from_crit_exc +ret_from_crit_exc: + lis r9,crit_srr0@ha; + lwz r9,crit_srr0@l(r9); + lis r10,crit_srr1@ha; + lwz r10,crit_srr1@l(r10); + mtspr SPRN_SRR0,r9; + mtspr SPRN_SRR1,r10; + RET_FROM_EXC_LEVEL(SPRN_CSRR0, SPRN_CSRR1, PPC_RFCI) +_ASM_NOKPROBE_SYMBOL(ret_from_crit_exc) +#endif /* CONFIG_40x */ + +#ifdef CONFIG_BOOKE + .globl ret_from_crit_exc +ret_from_crit_exc: + RESTORE_xSRR(SRR0,SRR1); + RESTORE_MMU_REGS; + RET_FROM_EXC_LEVEL(SPRN_CSRR0, SPRN_CSRR1, PPC_RFCI) +_ASM_NOKPROBE_SYMBOL(ret_from_crit_exc) + + .globl ret_from_debug_exc +ret_from_debug_exc: + RESTORE_xSRR(SRR0,SRR1); + RESTORE_xSRR(CSRR0,CSRR1); + RESTORE_MMU_REGS; + RET_FROM_EXC_LEVEL(SPRN_DSRR0, SPRN_DSRR1, PPC_RFDI) +_ASM_NOKPROBE_SYMBOL(ret_from_debug_exc) + + .globl ret_from_mcheck_exc +ret_from_mcheck_exc: + RESTORE_xSRR(SRR0,SRR1); + RESTORE_xSRR(CSRR0,CSRR1); + RESTORE_xSRR(DSRR0,DSRR1); + RESTORE_MMU_REGS; + RET_FROM_EXC_LEVEL(SPRN_MCSRR0, SPRN_MCSRR1, PPC_RFMCI) +_ASM_NOKPROBE_SYMBOL(ret_from_mcheck_exc) +#endif /* CONFIG_BOOKE */ +#endif /* !(CONFIG_4xx || CONFIG_BOOKE) */ diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S new file mode 100644 index 000000000..3e2e37e6e --- /dev/null +++ b/arch/powerpc/kernel/entry_64.S @@ -0,0 +1,329 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * PowerPC version + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP + * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> + * Adapted for Power Macintosh by Paul Mackerras. + * Low-level exception handlers and MMU support + * rewritten by Paul Mackerras. + * Copyright (C) 1996 Paul Mackerras. + * MPC8xx modifications Copyright (C) 1997 Dan Malek (dmalek@jlc.net). + * + * This file contains the system call entry code, context switch + * code, and exception/interrupt return code for PowerPC. + */ + +#include <linux/errno.h> +#include <linux/err.h> +#include <asm/cache.h> +#include <asm/unistd.h> +#include <asm/processor.h> +#include <asm/page.h> +#include <asm/mmu.h> +#include <asm/thread_info.h> +#include <asm/code-patching-asm.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/cputable.h> +#include <asm/firmware.h> +#include <asm/bug.h> +#include <asm/ptrace.h> +#include <asm/irqflags.h> +#include <asm/hw_irq.h> +#include <asm/context_tracking.h> +#include <asm/ppc-opcode.h> +#include <asm/barrier.h> +#include <asm/export.h> +#include <asm/asm-compat.h> +#ifdef CONFIG_PPC_BOOK3S +#include <asm/exception-64s.h> +#else +#include <asm/exception-64e.h> +#endif +#include <asm/feature-fixups.h> +#include <asm/kup.h> + +/* + * System calls. + */ + .section ".text" + +#ifdef CONFIG_PPC_BOOK3S_64 + +#define FLUSH_COUNT_CACHE \ +1: nop; \ + patch_site 1b, patch__call_flush_branch_caches1; \ +1: nop; \ + patch_site 1b, patch__call_flush_branch_caches2; \ +1: nop; \ + patch_site 1b, patch__call_flush_branch_caches3 + +.macro nops number + .rept \number + nop + .endr +.endm + +.balign 32 +.global flush_branch_caches +flush_branch_caches: + /* Save LR into r9 */ + mflr r9 + + // Flush the link stack + .rept 64 + bl .+4 + .endr + b 1f + nops 6 + + .balign 32 + /* Restore LR */ +1: mtlr r9 + + // If we're just flushing the link stack, return here +3: nop + patch_site 3b patch__flush_link_stack_return + + li r9,0x7fff + mtctr r9 + + PPC_BCCTR_FLUSH + +2: nop + patch_site 2b patch__flush_count_cache_return + + nops 3 + + .rept 278 + .balign 32 + PPC_BCCTR_FLUSH + nops 7 + .endr + + blr +#else +#define FLUSH_COUNT_CACHE +#endif /* CONFIG_PPC_BOOK3S_64 */ + +/* + * This routine switches between two different tasks. The process + * state of one is saved on its kernel stack. Then the state + * of the other is restored from its kernel stack. The memory + * management hardware is updated to the second process's state. + * Finally, we can return to the second process, via interrupt_return. + * On entry, r3 points to the THREAD for the current task, r4 + * points to the THREAD for the new task. + * + * Note: there are two ways to get to the "going out" portion + * of this code; either by coming in via the entry (_switch) + * or via "fork" which must set up an environment equivalent + * to the "_switch" path. If you change this you'll have to change + * the fork code also. + * + * The code which creates the new task context is in 'copy_thread' + * in arch/powerpc/kernel/process.c + */ + .align 7 +_GLOBAL(_switch) + mflr r0 + std r0,16(r1) + stdu r1,-SWITCH_FRAME_SIZE(r1) + /* r3-r13 are caller saved -- Cort */ + SAVE_NVGPRS(r1) + std r0,_NIP(r1) /* Return to switch caller */ + mfcr r23 + std r23,_CCR(r1) + std r1,KSP(r3) /* Set old stack pointer */ + + kuap_check_amr r9, r10 + + FLUSH_COUNT_CACHE /* Clobbers r9, ctr */ + + /* + * On SMP kernels, care must be taken because a task may be + * scheduled off CPUx and on to CPUy. Memory ordering must be + * considered. + * + * Cacheable stores on CPUx will be visible when the task is + * scheduled on CPUy by virtue of the core scheduler barriers + * (see "Notes on Program-Order guarantees on SMP systems." in + * kernel/sched/core.c). + * + * Uncacheable stores in the case of involuntary preemption must + * be taken care of. The smp_mb__after_spinlock() in __schedule() + * is implemented as hwsync on powerpc, which orders MMIO too. So + * long as there is an hwsync in the context switch path, it will + * be executed on the source CPU after the task has performed + * all MMIO ops on that CPU, and on the destination CPU before the + * task performs any MMIO ops there. + */ + + /* + * The kernel context switch path must contain a spin_lock, + * which contains larx/stcx, which will clear any reservation + * of the task being switched. + */ +#ifdef CONFIG_PPC_BOOK3S +/* Cancel all explict user streams as they will have no use after context + * switch and will stop the HW from creating streams itself + */ + DCBT_BOOK3S_STOP_ALL_STREAM_IDS(r6) +#endif + + addi r6,r4,-THREAD /* Convert THREAD to 'current' */ + std r6,PACACURRENT(r13) /* Set new 'current' */ +#if defined(CONFIG_STACKPROTECTOR) + ld r6, TASK_CANARY(r6) + std r6, PACA_CANARY(r13) +#endif + + ld r8,KSP(r4) /* new stack pointer */ +#ifdef CONFIG_PPC_64S_HASH_MMU +BEGIN_MMU_FTR_SECTION + b 2f +END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_RADIX) +BEGIN_FTR_SECTION + clrrdi r6,r8,28 /* get its ESID */ + clrrdi r9,r1,28 /* get current sp ESID */ +FTR_SECTION_ELSE + clrrdi r6,r8,40 /* get its 1T ESID */ + clrrdi r9,r1,40 /* get current sp 1T ESID */ +ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_1T_SEGMENT) + clrldi. r0,r6,2 /* is new ESID c00000000? */ + cmpd cr1,r6,r9 /* or is new ESID the same as current ESID? */ + cror eq,4*cr1+eq,eq + beq 2f /* if yes, don't slbie it */ + + /* Bolt in the new stack SLB entry */ + ld r7,KSP_VSID(r4) /* Get new stack's VSID */ + oris r0,r6,(SLB_ESID_V)@h + ori r0,r0,(SLB_NUM_BOLTED-1)@l +BEGIN_FTR_SECTION + li r9,MMU_SEGSIZE_1T /* insert B field */ + oris r6,r6,(MMU_SEGSIZE_1T << SLBIE_SSIZE_SHIFT)@h + rldimi r7,r9,SLB_VSID_SSIZE_SHIFT,0 +END_MMU_FTR_SECTION_IFSET(MMU_FTR_1T_SEGMENT) + + /* Update the last bolted SLB. No write barriers are needed + * here, provided we only update the current CPU's SLB shadow + * buffer. + */ + ld r9,PACA_SLBSHADOWPTR(r13) + li r12,0 + std r12,SLBSHADOW_STACKESID(r9) /* Clear ESID */ + li r12,SLBSHADOW_STACKVSID + STDX_BE r7,r12,r9 /* Save VSID */ + li r12,SLBSHADOW_STACKESID + STDX_BE r0,r12,r9 /* Save ESID */ + + /* No need to check for MMU_FTR_NO_SLBIE_B here, since when + * we have 1TB segments, the only CPUs known to have the errata + * only support less than 1TB of system memory and we'll never + * actually hit this code path. + */ + + isync + slbie r6 +BEGIN_FTR_SECTION + slbie r6 /* Workaround POWER5 < DD2.1 issue */ +END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) + slbmte r7,r0 + isync +2: +#endif /* CONFIG_PPC_64S_HASH_MMU */ + + clrrdi r7, r8, THREAD_SHIFT /* base of new stack */ + /* Note: this uses SWITCH_FRAME_SIZE rather than INT_FRAME_SIZE + because we don't need to leave the 288-byte ABI gap at the + top of the kernel stack. */ + addi r7,r7,THREAD_SIZE-SWITCH_FRAME_SIZE + + /* + * PMU interrupts in radix may come in here. They will use r1, not + * PACAKSAVE, so this stack switch will not cause a problem. They + * will store to the process stack, which may then be migrated to + * another CPU. However the rq lock release on this CPU paired with + * the rq lock acquire on the new CPU before the stack becomes + * active on the new CPU, will order those stores. + */ + mr r1,r8 /* start using new stack pointer */ + std r7,PACAKSAVE(r13) + + ld r6,_CCR(r1) + mtcrf 0xFF,r6 + + /* r3-r13 are destroyed -- Cort */ + REST_NVGPRS(r1) + + /* convert old thread to its task_struct for return value */ + addi r3,r3,-THREAD + ld r7,_NIP(r1) /* Return to _switch caller in new task */ + mtlr r7 + addi r1,r1,SWITCH_FRAME_SIZE + blr + +_GLOBAL(enter_prom) + mflr r0 + std r0,16(r1) + stdu r1,-SWITCH_FRAME_SIZE(r1) /* Save SP and create stack space */ + + /* Because PROM is running in 32b mode, it clobbers the high order half + * of all registers that it saves. We therefore save those registers + * PROM might touch to the stack. (r0, r3-r13 are caller saved) + */ + SAVE_GPR(2, r1) + SAVE_GPR(13, r1) + SAVE_NVGPRS(r1) + mfcr r10 + mfmsr r11 + std r10,_CCR(r1) + std r11,_MSR(r1) + + /* Put PROM address in SRR0 */ + mtsrr0 r4 + + /* Setup our trampoline return addr in LR */ + bcl 20,31,$+4 +0: mflr r4 + addi r4,r4,(1f - 0b) + mtlr r4 + + /* Prepare a 32-bit mode big endian MSR + */ +#ifdef CONFIG_PPC_BOOK3E_64 + rlwinm r11,r11,0,1,31 + mtsrr1 r11 + rfi +#else /* CONFIG_PPC_BOOK3E_64 */ + LOAD_REG_IMMEDIATE(r12, MSR_SF | MSR_LE) + andc r11,r11,r12 + mtsrr1 r11 + RFI_TO_KERNEL +#endif /* CONFIG_PPC_BOOK3E_64 */ + +1: /* Return from OF */ + FIXUP_ENDIAN + + /* Just make sure that r1 top 32 bits didn't get + * corrupt by OF + */ + rldicl r1,r1,0,32 + + /* Restore the MSR (back to 64 bits) */ + ld r0,_MSR(r1) + MTMSRD(r0) + isync + + /* Restore other registers */ + REST_GPR(2, r1) + REST_GPR(13, r1) + REST_NVGPRS(r1) + ld r4,_CCR(r1) + mtcr r4 + + addi r1,r1,SWITCH_FRAME_SIZE + ld r0,16(r1) + mtlr r0 + blr diff --git a/arch/powerpc/kernel/epapr_hcalls.S b/arch/powerpc/kernel/epapr_hcalls.S new file mode 100644 index 000000000..69a912550 --- /dev/null +++ b/arch/powerpc/kernel/epapr_hcalls.S @@ -0,0 +1,52 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2012 Freescale Semiconductor, Inc. + */ + +#include <linux/threads.h> +#include <asm/epapr_hcalls.h> +#include <asm/reg.h> +#include <asm/page.h> +#include <asm/cputable.h> +#include <asm/thread_info.h> +#include <asm/ppc_asm.h> +#include <asm/asm-compat.h> +#include <asm/asm-offsets.h> +#include <asm/export.h> + +#ifndef CONFIG_PPC64 +/* epapr_ev_idle() was derived from e500_idle() */ +_GLOBAL(epapr_ev_idle) + PPC_LL r4, TI_LOCAL_FLAGS(r2) /* set napping bit */ + ori r4, r4,_TLF_NAPPING /* so when we take an exception */ + PPC_STL r4, TI_LOCAL_FLAGS(r2) /* it will return to our caller */ + + wrteei 1 + +idle_loop: + LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE)) + +.global epapr_ev_idle_start +epapr_ev_idle_start: + li r3, -1 + nop + nop + nop + + /* + * Guard against spurious wakeups from a hypervisor -- + * only interrupt will cause us to return to LR due to + * _TLF_NAPPING. + */ + b idle_loop +#endif + +/* Hypercall entry point. Will be patched with device tree instructions. */ +.global epapr_hypercall_start +epapr_hypercall_start: + li r3, -1 + nop + nop + nop + blr +EXPORT_SYMBOL(epapr_hypercall_start) diff --git a/arch/powerpc/kernel/epapr_paravirt.c b/arch/powerpc/kernel/epapr_paravirt.c new file mode 100644 index 000000000..d4b8aff20 --- /dev/null +++ b/arch/powerpc/kernel/epapr_paravirt.c @@ -0,0 +1,74 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ePAPR para-virtualization support. + * + * Copyright (C) 2012 Freescale Semiconductor, Inc. + */ + +#include <linux/of.h> +#include <linux/of_fdt.h> +#include <asm/epapr_hcalls.h> +#include <asm/cacheflush.h> +#include <asm/code-patching.h> +#include <asm/machdep.h> +#include <asm/inst.h> + +#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64) +extern void epapr_ev_idle(void); +extern u32 epapr_ev_idle_start[]; +#endif + +bool epapr_paravirt_enabled; +static bool __maybe_unused epapr_has_idle; + +static int __init early_init_dt_scan_epapr(unsigned long node, + const char *uname, + int depth, void *data) +{ + const u32 *insts; + int len; + int i; + + insts = of_get_flat_dt_prop(node, "hcall-instructions", &len); + if (!insts) + return 0; + + if (len % 4 || len > (4 * 4)) + return -1; + + for (i = 0; i < (len / 4); i++) { + ppc_inst_t inst = ppc_inst(be32_to_cpu(insts[i])); + patch_instruction(epapr_hypercall_start + i, inst); +#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64) + patch_instruction(epapr_ev_idle_start + i, inst); +#endif + } + +#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64) + if (of_get_flat_dt_prop(node, "has-idle", NULL)) + epapr_has_idle = true; +#endif + + epapr_paravirt_enabled = true; + + return 1; +} + +int __init epapr_paravirt_early_init(void) +{ + of_scan_flat_dt(early_init_dt_scan_epapr, NULL); + + return 0; +} + +static int __init epapr_idle_init(void) +{ +#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64) + if (epapr_has_idle) + ppc_md.power_save = epapr_ev_idle; +#endif + + return 0; +} + +postcore_initcall(epapr_idle_init); diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S new file mode 100644 index 000000000..2f68fb2ee --- /dev/null +++ b/arch/powerpc/kernel/exceptions-64e.S @@ -0,0 +1,1551 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Boot code and exception vectors for Book3E processors + * + * Copyright (C) 2007 Ben. Herrenschmidt (benh@kernel.crashing.org), IBM Corp. + */ + +#include <linux/threads.h> +#include <asm/reg.h> +#include <asm/page.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/cputable.h> +#include <asm/setup.h> +#include <asm/thread_info.h> +#include <asm/reg_a2.h> +#include <asm/exception-64e.h> +#include <asm/bug.h> +#include <asm/irqflags.h> +#include <asm/ptrace.h> +#include <asm/ppc-opcode.h> +#include <asm/mmu.h> +#include <asm/hw_irq.h> +#include <asm/kvm_asm.h> +#include <asm/kvm_booke_hv_asm.h> +#include <asm/feature-fixups.h> +#include <asm/context_tracking.h> + +/* 64e interrupt returns always use SRR registers */ +#define fast_interrupt_return fast_interrupt_return_srr +#define interrupt_return interrupt_return_srr + +/* XXX This will ultimately add space for a special exception save + * structure used to save things like SRR0/SRR1, SPRGs, MAS, etc... + * when taking special interrupts. For now we don't support that, + * special interrupts from within a non-standard level will probably + * blow you up + */ +#define SPECIAL_EXC_SRR0 0 +#define SPECIAL_EXC_SRR1 1 +#define SPECIAL_EXC_SPRG_GEN 2 +#define SPECIAL_EXC_SPRG_TLB 3 +#define SPECIAL_EXC_MAS0 4 +#define SPECIAL_EXC_MAS1 5 +#define SPECIAL_EXC_MAS2 6 +#define SPECIAL_EXC_MAS3 7 +#define SPECIAL_EXC_MAS6 8 +#define SPECIAL_EXC_MAS7 9 +#define SPECIAL_EXC_MAS5 10 /* E.HV only */ +#define SPECIAL_EXC_MAS8 11 /* E.HV only */ +#define SPECIAL_EXC_IRQHAPPENED 12 +#define SPECIAL_EXC_DEAR 13 +#define SPECIAL_EXC_ESR 14 +#define SPECIAL_EXC_SOFTE 15 +#define SPECIAL_EXC_CSRR0 16 +#define SPECIAL_EXC_CSRR1 17 +/* must be even to keep 16-byte stack alignment */ +#define SPECIAL_EXC_END 18 + +#define SPECIAL_EXC_FRAME_SIZE (INT_FRAME_SIZE + SPECIAL_EXC_END * 8) +#define SPECIAL_EXC_FRAME_OFFS (INT_FRAME_SIZE - 288) + +#define SPECIAL_EXC_STORE(reg, name) \ + std reg, (SPECIAL_EXC_##name * 8 + SPECIAL_EXC_FRAME_OFFS)(r1) + +#define SPECIAL_EXC_LOAD(reg, name) \ + ld reg, (SPECIAL_EXC_##name * 8 + SPECIAL_EXC_FRAME_OFFS)(r1) + +special_reg_save: + /* + * We only need (or have stack space) to save this stuff if + * we interrupted the kernel. + */ + ld r3,_MSR(r1) + andi. r3,r3,MSR_PR + bnelr + + /* + * Advance to the next TLB exception frame for handler + * types that don't do it automatically. + */ + LOAD_REG_ADDR(r11,extlb_level_exc) + lwz r12,0(r11) + mfspr r10,SPRN_SPRG_TLB_EXFRAME + add r10,r10,r12 + mtspr SPRN_SPRG_TLB_EXFRAME,r10 + + /* + * Save registers needed to allow nesting of certain exceptions + * (such as TLB misses) inside special exception levels + */ + mfspr r10,SPRN_SRR0 + SPECIAL_EXC_STORE(r10,SRR0) + mfspr r10,SPRN_SRR1 + SPECIAL_EXC_STORE(r10,SRR1) + mfspr r10,SPRN_SPRG_GEN_SCRATCH + SPECIAL_EXC_STORE(r10,SPRG_GEN) + mfspr r10,SPRN_SPRG_TLB_SCRATCH + SPECIAL_EXC_STORE(r10,SPRG_TLB) + mfspr r10,SPRN_MAS0 + SPECIAL_EXC_STORE(r10,MAS0) + mfspr r10,SPRN_MAS1 + SPECIAL_EXC_STORE(r10,MAS1) + mfspr r10,SPRN_MAS2 + SPECIAL_EXC_STORE(r10,MAS2) + mfspr r10,SPRN_MAS3 + SPECIAL_EXC_STORE(r10,MAS3) + mfspr r10,SPRN_MAS6 + SPECIAL_EXC_STORE(r10,MAS6) + mfspr r10,SPRN_MAS7 + SPECIAL_EXC_STORE(r10,MAS7) +BEGIN_FTR_SECTION + mfspr r10,SPRN_MAS5 + SPECIAL_EXC_STORE(r10,MAS5) + mfspr r10,SPRN_MAS8 + SPECIAL_EXC_STORE(r10,MAS8) + + /* MAS5/8 could have inappropriate values if we interrupted KVM code */ + li r10,0 + mtspr SPRN_MAS5,r10 + mtspr SPRN_MAS8,r10 +END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV) + mfspr r10,SPRN_DEAR + SPECIAL_EXC_STORE(r10,DEAR) + mfspr r10,SPRN_ESR + SPECIAL_EXC_STORE(r10,ESR) + + ld r10,_NIP(r1) + SPECIAL_EXC_STORE(r10,CSRR0) + ld r10,_MSR(r1) + SPECIAL_EXC_STORE(r10,CSRR1) + + blr + +ret_from_level_except: + ld r3,_MSR(r1) + andi. r3,r3,MSR_PR + beq 1f + REST_NVGPRS(r1) + b interrupt_return +1: + + LOAD_REG_ADDR(r11,extlb_level_exc) + lwz r12,0(r11) + mfspr r10,SPRN_SPRG_TLB_EXFRAME + sub r10,r10,r12 + mtspr SPRN_SPRG_TLB_EXFRAME,r10 + + /* + * It's possible that the special level exception interrupted a + * TLB miss handler, and inserted the same entry that the + * interrupted handler was about to insert. On CPUs without TLB + * write conditional, this can result in a duplicate TLB entry. + * Wipe all non-bolted entries to be safe. + * + * Note that this doesn't protect against any TLB misses + * we may take accessing the stack from here to the end of + * the special level exception. It's not clear how we can + * reasonably protect against that, but only CPUs with + * neither TLB write conditional nor bolted kernel memory + * are affected. Do any such CPUs even exist? + */ + PPC_TLBILX_ALL(0,R0) + + REST_NVGPRS(r1) + + SPECIAL_EXC_LOAD(r10,SRR0) + mtspr SPRN_SRR0,r10 + SPECIAL_EXC_LOAD(r10,SRR1) + mtspr SPRN_SRR1,r10 + SPECIAL_EXC_LOAD(r10,SPRG_GEN) + mtspr SPRN_SPRG_GEN_SCRATCH,r10 + SPECIAL_EXC_LOAD(r10,SPRG_TLB) + mtspr SPRN_SPRG_TLB_SCRATCH,r10 + SPECIAL_EXC_LOAD(r10,MAS0) + mtspr SPRN_MAS0,r10 + SPECIAL_EXC_LOAD(r10,MAS1) + mtspr SPRN_MAS1,r10 + SPECIAL_EXC_LOAD(r10,MAS2) + mtspr SPRN_MAS2,r10 + SPECIAL_EXC_LOAD(r10,MAS3) + mtspr SPRN_MAS3,r10 + SPECIAL_EXC_LOAD(r10,MAS6) + mtspr SPRN_MAS6,r10 + SPECIAL_EXC_LOAD(r10,MAS7) + mtspr SPRN_MAS7,r10 +BEGIN_FTR_SECTION + SPECIAL_EXC_LOAD(r10,MAS5) + mtspr SPRN_MAS5,r10 + SPECIAL_EXC_LOAD(r10,MAS8) + mtspr SPRN_MAS8,r10 +END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV) + + SPECIAL_EXC_LOAD(r10,DEAR) + mtspr SPRN_DEAR,r10 + SPECIAL_EXC_LOAD(r10,ESR) + mtspr SPRN_ESR,r10 + + stdcx. r0,0,r1 /* to clear the reservation */ + + REST_GPRS(2, 9, r1) + + ld r10,_CTR(r1) + ld r11,_XER(r1) + mtctr r10 + mtxer r11 + + blr + +.macro ret_from_level srr0 srr1 paca_ex scratch + bl ret_from_level_except + + ld r10,_LINK(r1) + ld r11,_CCR(r1) + ld r0,GPR13(r1) + mtlr r10 + mtcr r11 + + REST_GPRS(10, 12, r1) + mtspr \scratch,r0 + + std r10,\paca_ex+EX_R10(r13); + std r11,\paca_ex+EX_R11(r13); + ld r10,_NIP(r1) + ld r11,_MSR(r1) + REST_GPR(0, r1) + REST_GPR(1, r1) + mtspr \srr0,r10 + mtspr \srr1,r11 + ld r10,\paca_ex+EX_R10(r13) + ld r11,\paca_ex+EX_R11(r13) + mfspr r13,\scratch +.endm + +ret_from_crit_except: + ret_from_level SPRN_CSRR0 SPRN_CSRR1 PACA_EXCRIT SPRN_SPRG_CRIT_SCRATCH + rfci + +ret_from_mc_except: + ret_from_level SPRN_MCSRR0 SPRN_MCSRR1 PACA_EXMC SPRN_SPRG_MC_SCRATCH + rfmci + +/* Exception prolog code for all exceptions */ +#define EXCEPTION_PROLOG(n, intnum, type, addition) \ + mtspr SPRN_SPRG_##type##_SCRATCH,r13; /* get spare registers */ \ + mfspr r13,SPRN_SPRG_PACA; /* get PACA */ \ + std r10,PACA_EX##type+EX_R10(r13); \ + std r11,PACA_EX##type+EX_R11(r13); \ + mfcr r10; /* save CR */ \ + mfspr r11,SPRN_##type##_SRR1;/* what are we coming from */ \ + DO_KVM intnum,SPRN_##type##_SRR1; /* KVM hook */ \ + stw r10,PACA_EX##type+EX_CR(r13); /* save old CR in the PACA */ \ + addition; /* additional code for that exc. */ \ + std r1,PACA_EX##type+EX_R1(r13); /* save old r1 in the PACA */ \ + type##_SET_KSTACK; /* get special stack if necessary */\ + andi. r10,r11,MSR_PR; /* save stack pointer */ \ + beq 1f; /* branch around if supervisor */ \ + ld r1,PACAKSAVE(r13); /* get kernel stack coming from usr */\ +1: type##_BTB_FLUSH \ + cmpdi cr1,r1,0; /* check if SP makes sense */ \ + bge- cr1,exc_##n##_bad_stack;/* bad stack (TODO: out of line) */ \ + mfspr r10,SPRN_##type##_SRR0; /* read SRR0 before touching stack */ + +/* Exception type-specific macros */ +#define GEN_SET_KSTACK \ + subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */ +#define SPRN_GEN_SRR0 SPRN_SRR0 +#define SPRN_GEN_SRR1 SPRN_SRR1 + +#define GDBELL_SET_KSTACK GEN_SET_KSTACK +#define SPRN_GDBELL_SRR0 SPRN_GSRR0 +#define SPRN_GDBELL_SRR1 SPRN_GSRR1 + +#define CRIT_SET_KSTACK \ + ld r1,PACA_CRIT_STACK(r13); \ + subi r1,r1,SPECIAL_EXC_FRAME_SIZE +#define SPRN_CRIT_SRR0 SPRN_CSRR0 +#define SPRN_CRIT_SRR1 SPRN_CSRR1 + +#define DBG_SET_KSTACK \ + ld r1,PACA_DBG_STACK(r13); \ + subi r1,r1,SPECIAL_EXC_FRAME_SIZE +#define SPRN_DBG_SRR0 SPRN_DSRR0 +#define SPRN_DBG_SRR1 SPRN_DSRR1 + +#define MC_SET_KSTACK \ + ld r1,PACA_MC_STACK(r13); \ + subi r1,r1,SPECIAL_EXC_FRAME_SIZE +#define SPRN_MC_SRR0 SPRN_MCSRR0 +#define SPRN_MC_SRR1 SPRN_MCSRR1 + +#define GEN_BTB_FLUSH \ + START_BTB_FLUSH_SECTION \ + beq 1f; \ + BTB_FLUSH(r10) \ + 1: \ + END_BTB_FLUSH_SECTION + +#define CRIT_BTB_FLUSH \ + START_BTB_FLUSH_SECTION \ + BTB_FLUSH(r10) \ + END_BTB_FLUSH_SECTION + +#define DBG_BTB_FLUSH CRIT_BTB_FLUSH +#define MC_BTB_FLUSH CRIT_BTB_FLUSH +#define GDBELL_BTB_FLUSH GEN_BTB_FLUSH + +#define NORMAL_EXCEPTION_PROLOG(n, intnum, addition) \ + EXCEPTION_PROLOG(n, intnum, GEN, addition##_GEN(n)) + +#define CRIT_EXCEPTION_PROLOG(n, intnum, addition) \ + EXCEPTION_PROLOG(n, intnum, CRIT, addition##_CRIT(n)) + +#define DBG_EXCEPTION_PROLOG(n, intnum, addition) \ + EXCEPTION_PROLOG(n, intnum, DBG, addition##_DBG(n)) + +#define MC_EXCEPTION_PROLOG(n, intnum, addition) \ + EXCEPTION_PROLOG(n, intnum, MC, addition##_MC(n)) + +#define GDBELL_EXCEPTION_PROLOG(n, intnum, addition) \ + EXCEPTION_PROLOG(n, intnum, GDBELL, addition##_GDBELL(n)) + +/* Variants of the "addition" argument for the prolog + */ +#define PROLOG_ADDITION_NONE_GEN(n) +#define PROLOG_ADDITION_NONE_GDBELL(n) +#define PROLOG_ADDITION_NONE_CRIT(n) +#define PROLOG_ADDITION_NONE_DBG(n) +#define PROLOG_ADDITION_NONE_MC(n) + +#define PROLOG_ADDITION_MASKABLE_GEN(n) \ + lbz r10,PACAIRQSOFTMASK(r13); /* are irqs soft-masked? */ \ + andi. r10,r10,IRQS_DISABLED; /* yes -> go out of line */ \ + bne masked_interrupt_book3e_##n + +/* + * Additional regs must be re-loaded from paca before EXCEPTION_COMMON* is + * called, because that does SAVE_NVGPRS which must see the original register + * values, otherwise the scratch values might be restored when exiting the + * interrupt. + */ +#define PROLOG_ADDITION_2REGS_GEN(n) \ + std r14,PACA_EXGEN+EX_R14(r13); \ + std r15,PACA_EXGEN+EX_R15(r13) + +#define PROLOG_ADDITION_1REG_GEN(n) \ + std r14,PACA_EXGEN+EX_R14(r13); + +#define PROLOG_ADDITION_2REGS_CRIT(n) \ + std r14,PACA_EXCRIT+EX_R14(r13); \ + std r15,PACA_EXCRIT+EX_R15(r13) + +#define PROLOG_ADDITION_2REGS_DBG(n) \ + std r14,PACA_EXDBG+EX_R14(r13); \ + std r15,PACA_EXDBG+EX_R15(r13) + +#define PROLOG_ADDITION_2REGS_MC(n) \ + std r14,PACA_EXMC+EX_R14(r13); \ + std r15,PACA_EXMC+EX_R15(r13) + + +/* Core exception code for all exceptions except TLB misses. */ +#define EXCEPTION_COMMON_LVL(n, scratch, excf) \ +exc_##n##_common: \ + SAVE_GPR(0, r1); /* save r0 in stackframe */ \ + SAVE_GPRS(2, 9, r1); /* save r2 - r9 in stackframe */ \ + std r10,_NIP(r1); /* save SRR0 to stackframe */ \ + std r11,_MSR(r1); /* save SRR1 to stackframe */ \ + beq 2f; /* if from kernel mode */ \ +2: ld r3,excf+EX_R10(r13); /* get back r10 */ \ + ld r4,excf+EX_R11(r13); /* get back r11 */ \ + mfspr r5,scratch; /* get back r13 */ \ + SAVE_GPR(12, r1); /* save r12 in stackframe */ \ + LOAD_PACA_TOC(); /* get kernel TOC into r2 */ \ + mflr r6; /* save LR in stackframe */ \ + mfctr r7; /* save CTR in stackframe */ \ + mfspr r8,SPRN_XER; /* save XER in stackframe */ \ + ld r9,excf+EX_R1(r13); /* load orig r1 back from PACA */ \ + lwz r10,excf+EX_CR(r13); /* load orig CR back from PACA */ \ + lbz r11,PACAIRQSOFTMASK(r13); /* get current IRQ softe */ \ + LOAD_REG_IMMEDIATE(r12, STACK_FRAME_REGS_MARKER); \ + ZEROIZE_GPR(0); \ + std r3,GPR10(r1); /* save r10 to stackframe */ \ + std r4,GPR11(r1); /* save r11 to stackframe */ \ + std r5,GPR13(r1); /* save it to stackframe */ \ + std r6,_LINK(r1); \ + std r7,_CTR(r1); \ + std r8,_XER(r1); \ + li r3,(n); /* regs.trap vector */ \ + std r9,0(r1); /* store stack frame back link */ \ + std r10,_CCR(r1); /* store orig CR in stackframe */ \ + std r9,GPR1(r1); /* store stack frame back link */ \ + std r11,SOFTE(r1); /* and save it to stackframe */ \ + std r12,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */ \ + std r3,_TRAP(r1); /* set trap number */ \ + std r0,RESULT(r1); /* clear regs->result */ \ + SAVE_NVGPRS(r1); + +#define EXCEPTION_COMMON(n) \ + EXCEPTION_COMMON_LVL(n, SPRN_SPRG_GEN_SCRATCH, PACA_EXGEN) +#define EXCEPTION_COMMON_CRIT(n) \ + EXCEPTION_COMMON_LVL(n, SPRN_SPRG_CRIT_SCRATCH, PACA_EXCRIT) +#define EXCEPTION_COMMON_MC(n) \ + EXCEPTION_COMMON_LVL(n, SPRN_SPRG_MC_SCRATCH, PACA_EXMC) +#define EXCEPTION_COMMON_DBG(n) \ + EXCEPTION_COMMON_LVL(n, SPRN_SPRG_DBG_SCRATCH, PACA_EXDBG) + +/* XXX FIXME: Restore r14/r15 when necessary */ +#define BAD_STACK_TRAMPOLINE(n) \ +exc_##n##_bad_stack: \ + li r1,(n); /* get exception number */ \ + sth r1,PACA_TRAP_SAVE(r13); /* store trap */ \ + b bad_stack_book3e; /* bad stack error */ + +/* WARNING: If you change the layout of this stub, make sure you check + * the debug exception handler which handles single stepping + * into exceptions from userspace, and the MM code in + * arch/powerpc/mm/tlb_nohash.c which patches the branch here + * and would need to be updated if that branch is moved + */ +#define EXCEPTION_STUB(loc, label) \ + . = interrupt_base_book3e + loc; \ + nop; /* To make debug interrupts happy */ \ + b exc_##label##_book3e; + +#define ACK_NONE(r) +#define ACK_DEC(r) \ + lis r,TSR_DIS@h; \ + mtspr SPRN_TSR,r +#define ACK_FIT(r) \ + lis r,TSR_FIS@h; \ + mtspr SPRN_TSR,r + +/* Used by asynchronous interrupt that may happen in the idle loop. + * + * This check if the thread was in the idle loop, and if yes, returns + * to the caller rather than the PC. This is to avoid a race if + * interrupts happen before the wait instruction. + */ +#define CHECK_NAPPING() \ + ld r11, PACA_THREAD_INFO(r13); \ + ld r10,TI_LOCAL_FLAGS(r11); \ + andi. r9,r10,_TLF_NAPPING; \ + beq+ 1f; \ + ld r8,_LINK(r1); \ + rlwinm r7,r10,0,~_TLF_NAPPING; \ + std r8,_NIP(r1); \ + std r7,TI_LOCAL_FLAGS(r11); \ +1: + + +#define MASKABLE_EXCEPTION(trapnum, intnum, label, hdlr, ack) \ + START_EXCEPTION(label); \ + NORMAL_EXCEPTION_PROLOG(trapnum, intnum, PROLOG_ADDITION_MASKABLE)\ + EXCEPTION_COMMON(trapnum) \ + ack(r8); \ + CHECK_NAPPING(); \ + addi r3,r1,STACK_FRAME_OVERHEAD; \ + bl hdlr; \ + b interrupt_return + +/* + * And here we have the exception vectors ! + */ + + .text + .balign 0x1000 + .globl interrupt_base_book3e +interrupt_base_book3e: /* fake trap */ + EXCEPTION_STUB(0x000, machine_check) + EXCEPTION_STUB(0x020, critical_input) /* 0x0100 */ + EXCEPTION_STUB(0x040, debug_crit) /* 0x0d00 */ + EXCEPTION_STUB(0x060, data_storage) /* 0x0300 */ + EXCEPTION_STUB(0x080, instruction_storage) /* 0x0400 */ + EXCEPTION_STUB(0x0a0, external_input) /* 0x0500 */ + EXCEPTION_STUB(0x0c0, alignment) /* 0x0600 */ + EXCEPTION_STUB(0x0e0, program) /* 0x0700 */ + EXCEPTION_STUB(0x100, fp_unavailable) /* 0x0800 */ + EXCEPTION_STUB(0x120, system_call) /* 0x0c00 */ + EXCEPTION_STUB(0x140, ap_unavailable) /* 0x0f20 */ + EXCEPTION_STUB(0x160, decrementer) /* 0x0900 */ + EXCEPTION_STUB(0x180, fixed_interval) /* 0x0980 */ + EXCEPTION_STUB(0x1a0, watchdog) /* 0x09f0 */ + EXCEPTION_STUB(0x1c0, data_tlb_miss) + EXCEPTION_STUB(0x1e0, instruction_tlb_miss) + EXCEPTION_STUB(0x200, altivec_unavailable) + EXCEPTION_STUB(0x220, altivec_assist) + EXCEPTION_STUB(0x260, perfmon) + EXCEPTION_STUB(0x280, doorbell) + EXCEPTION_STUB(0x2a0, doorbell_crit) + EXCEPTION_STUB(0x2c0, guest_doorbell) + EXCEPTION_STUB(0x2e0, guest_doorbell_crit) + EXCEPTION_STUB(0x300, hypercall) + EXCEPTION_STUB(0x320, ehpriv) + EXCEPTION_STUB(0x340, lrat_error) + + .globl __end_interrupts +__end_interrupts: + +/* Critical Input Interrupt */ + START_EXCEPTION(critical_input); + CRIT_EXCEPTION_PROLOG(0x100, BOOKE_INTERRUPT_CRITICAL, + PROLOG_ADDITION_NONE) + EXCEPTION_COMMON_CRIT(0x100) + bl special_reg_save + CHECK_NAPPING(); + addi r3,r1,STACK_FRAME_OVERHEAD + bl unknown_nmi_exception + b ret_from_crit_except + +/* Machine Check Interrupt */ + START_EXCEPTION(machine_check); + MC_EXCEPTION_PROLOG(0x000, BOOKE_INTERRUPT_MACHINE_CHECK, + PROLOG_ADDITION_NONE) + EXCEPTION_COMMON_MC(0x000) + bl special_reg_save + CHECK_NAPPING(); + addi r3,r1,STACK_FRAME_OVERHEAD + bl machine_check_exception + b ret_from_mc_except + +/* Data Storage Interrupt */ + START_EXCEPTION(data_storage) + NORMAL_EXCEPTION_PROLOG(0x300, BOOKE_INTERRUPT_DATA_STORAGE, + PROLOG_ADDITION_2REGS) + mfspr r14,SPRN_DEAR + mfspr r15,SPRN_ESR + std r14,_DEAR(r1) + std r15,_ESR(r1) + ld r14,PACA_EXGEN+EX_R14(r13) + ld r15,PACA_EXGEN+EX_R15(r13) + EXCEPTION_COMMON(0x300) + b storage_fault_common + +/* Instruction Storage Interrupt */ + START_EXCEPTION(instruction_storage); + NORMAL_EXCEPTION_PROLOG(0x400, BOOKE_INTERRUPT_INST_STORAGE, + PROLOG_ADDITION_2REGS) + li r15,0 + mr r14,r10 + std r14,_DEAR(r1) + std r15,_ESR(r1) + ld r14,PACA_EXGEN+EX_R14(r13) + ld r15,PACA_EXGEN+EX_R15(r13) + EXCEPTION_COMMON(0x400) + b storage_fault_common + +/* External Input Interrupt */ + MASKABLE_EXCEPTION(0x500, BOOKE_INTERRUPT_EXTERNAL, + external_input, do_IRQ, ACK_NONE) + +/* Alignment */ + START_EXCEPTION(alignment); + NORMAL_EXCEPTION_PROLOG(0x600, BOOKE_INTERRUPT_ALIGNMENT, + PROLOG_ADDITION_2REGS) + mfspr r14,SPRN_DEAR + mfspr r15,SPRN_ESR + std r14,_DEAR(r1) + std r15,_ESR(r1) + ld r14,PACA_EXGEN+EX_R14(r13) + ld r15,PACA_EXGEN+EX_R15(r13) + EXCEPTION_COMMON(0x600) + b alignment_more /* no room, go out of line */ + +/* Program Interrupt */ + START_EXCEPTION(program); + NORMAL_EXCEPTION_PROLOG(0x700, BOOKE_INTERRUPT_PROGRAM, + PROLOG_ADDITION_1REG) + mfspr r14,SPRN_ESR + std r14,_ESR(r1) + ld r14,PACA_EXGEN+EX_R14(r13) + EXCEPTION_COMMON(0x700) + addi r3,r1,STACK_FRAME_OVERHEAD + bl program_check_exception + REST_NVGPRS(r1) + b interrupt_return + +/* Floating Point Unavailable Interrupt */ + START_EXCEPTION(fp_unavailable); + NORMAL_EXCEPTION_PROLOG(0x800, BOOKE_INTERRUPT_FP_UNAVAIL, + PROLOG_ADDITION_NONE) + /* we can probably do a shorter exception entry for that one... */ + EXCEPTION_COMMON(0x800) + ld r12,_MSR(r1) + andi. r0,r12,MSR_PR; + beq- 1f + bl load_up_fpu + b fast_interrupt_return +1: addi r3,r1,STACK_FRAME_OVERHEAD + bl kernel_fp_unavailable_exception + b interrupt_return + +/* Altivec Unavailable Interrupt */ + START_EXCEPTION(altivec_unavailable); + NORMAL_EXCEPTION_PROLOG(0x200, BOOKE_INTERRUPT_ALTIVEC_UNAVAIL, + PROLOG_ADDITION_NONE) + /* we can probably do a shorter exception entry for that one... */ + EXCEPTION_COMMON(0x200) +#ifdef CONFIG_ALTIVEC +BEGIN_FTR_SECTION + ld r12,_MSR(r1) + andi. r0,r12,MSR_PR; + beq- 1f + bl load_up_altivec + b fast_interrupt_return +1: +END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) +#endif + addi r3,r1,STACK_FRAME_OVERHEAD + bl altivec_unavailable_exception + b interrupt_return + +/* AltiVec Assist */ + START_EXCEPTION(altivec_assist); + NORMAL_EXCEPTION_PROLOG(0x220, + BOOKE_INTERRUPT_ALTIVEC_ASSIST, + PROLOG_ADDITION_NONE) + EXCEPTION_COMMON(0x220) + addi r3,r1,STACK_FRAME_OVERHEAD +#ifdef CONFIG_ALTIVEC +BEGIN_FTR_SECTION + bl altivec_assist_exception +END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) + REST_NVGPRS(r1) +#else + bl unknown_exception +#endif + b interrupt_return + + +/* Decrementer Interrupt */ + MASKABLE_EXCEPTION(0x900, BOOKE_INTERRUPT_DECREMENTER, + decrementer, timer_interrupt, ACK_DEC) + +/* Fixed Interval Timer Interrupt */ + MASKABLE_EXCEPTION(0x980, BOOKE_INTERRUPT_FIT, + fixed_interval, unknown_exception, ACK_FIT) + +/* Watchdog Timer Interrupt */ + START_EXCEPTION(watchdog); + CRIT_EXCEPTION_PROLOG(0x9f0, BOOKE_INTERRUPT_WATCHDOG, + PROLOG_ADDITION_NONE) + EXCEPTION_COMMON_CRIT(0x9f0) + bl special_reg_save + CHECK_NAPPING(); + addi r3,r1,STACK_FRAME_OVERHEAD +#ifdef CONFIG_BOOKE_WDT + bl WatchdogException +#else + bl unknown_nmi_exception +#endif + b ret_from_crit_except + +/* System Call Interrupt */ + START_EXCEPTION(system_call) + mr r9,r13 /* keep a copy of userland r13 */ + mfspr r11,SPRN_SRR0 /* get return address */ + mfspr r12,SPRN_SRR1 /* get previous MSR */ + mfspr r13,SPRN_SPRG_PACA /* get our PACA */ + b system_call_common + +/* Auxiliary Processor Unavailable Interrupt */ + START_EXCEPTION(ap_unavailable); + NORMAL_EXCEPTION_PROLOG(0xf20, BOOKE_INTERRUPT_AP_UNAVAIL, + PROLOG_ADDITION_NONE) + EXCEPTION_COMMON(0xf20) + addi r3,r1,STACK_FRAME_OVERHEAD + bl unknown_exception + b interrupt_return + +/* Debug exception as a critical interrupt*/ + START_EXCEPTION(debug_crit); + CRIT_EXCEPTION_PROLOG(0xd00, BOOKE_INTERRUPT_DEBUG, + PROLOG_ADDITION_2REGS) + + /* + * If there is a single step or branch-taken exception in an + * exception entry sequence, it was probably meant to apply to + * the code where the exception occurred (since exception entry + * doesn't turn off DE automatically). We simulate the effect + * of turning off DE on entry to an exception handler by turning + * off DE in the CSRR1 value and clearing the debug status. + */ + + mfspr r14,SPRN_DBSR /* check single-step/branch taken */ + andis. r15,r14,(DBSR_IC|DBSR_BT)@h + beq+ 1f + +#ifdef CONFIG_RELOCATABLE + __LOAD_PACA_TOC(r15) + LOAD_REG_ADDR_ALTTOC(r14, r15, interrupt_base_book3e) + LOAD_REG_ADDR_ALTTOC(r15, r15, __end_interrupts) + cmpld cr0,r10,r14 + cmpld cr1,r10,r15 +#else + LOAD_REG_IMMEDIATE_SYM(r14, r15, interrupt_base_book3e) + cmpld cr0, r10, r14 + LOAD_REG_IMMEDIATE_SYM(r14, r15, __end_interrupts) + cmpld cr1, r10, r14 +#endif + blt+ cr0,1f + bge+ cr1,1f + + /* here it looks like we got an inappropriate debug exception. */ + lis r14,(DBSR_IC|DBSR_BT)@h /* clear the event */ + rlwinm r11,r11,0,~MSR_DE /* clear DE in the CSRR1 value */ + mtspr SPRN_DBSR,r14 + mtspr SPRN_CSRR1,r11 + lwz r10,PACA_EXCRIT+EX_CR(r13) /* restore registers */ + ld r1,PACA_EXCRIT+EX_R1(r13) + ld r14,PACA_EXCRIT+EX_R14(r13) + ld r15,PACA_EXCRIT+EX_R15(r13) + mtcr r10 + ld r10,PACA_EXCRIT+EX_R10(r13) /* restore registers */ + ld r11,PACA_EXCRIT+EX_R11(r13) + mfspr r13,SPRN_SPRG_CRIT_SCRATCH + rfci + + /* Normal debug exception */ + /* XXX We only handle coming from userspace for now since we can't + * quite save properly an interrupted kernel state yet + */ +1: andi. r14,r11,MSR_PR; /* check for userspace again */ + beq kernel_dbg_exc; /* if from kernel mode */ + + /* Now we mash up things to make it look like we are coming on a + * normal exception + */ + mfspr r14,SPRN_DBSR + std r14,_DSISR(r1) + ld r14,PACA_EXCRIT+EX_R14(r13) + ld r15,PACA_EXCRIT+EX_R15(r13) + EXCEPTION_COMMON_CRIT(0xd00) + addi r3,r1,STACK_FRAME_OVERHEAD + bl DebugException + REST_NVGPRS(r1) + b interrupt_return + +kernel_dbg_exc: + b . /* NYI */ + +/* Debug exception as a debug interrupt*/ + START_EXCEPTION(debug_debug); + DBG_EXCEPTION_PROLOG(0xd00, BOOKE_INTERRUPT_DEBUG, + PROLOG_ADDITION_2REGS) + + /* + * If there is a single step or branch-taken exception in an + * exception entry sequence, it was probably meant to apply to + * the code where the exception occurred (since exception entry + * doesn't turn off DE automatically). We simulate the effect + * of turning off DE on entry to an exception handler by turning + * off DE in the DSRR1 value and clearing the debug status. + */ + + mfspr r14,SPRN_DBSR /* check single-step/branch taken */ + andis. r15,r14,(DBSR_IC|DBSR_BT)@h + beq+ 1f + +#ifdef CONFIG_RELOCATABLE + __LOAD_PACA_TOC(r15) + LOAD_REG_ADDR_ALTTOC(r14, r15, interrupt_base_book3e) + LOAD_REG_ADDR_ALTTOC(r15, r15, __end_interrupts) + cmpld cr0,r10,r14 + cmpld cr1,r10,r15 +#else + LOAD_REG_IMMEDIATE_SYM(r14, r15, interrupt_base_book3e) + cmpld cr0, r10, r14 + LOAD_REG_IMMEDIATE_SYM(r14, r15,__end_interrupts) + cmpld cr1, r10, r14 +#endif + blt+ cr0,1f + bge+ cr1,1f + + /* here it looks like we got an inappropriate debug exception. */ + lis r14,(DBSR_IC|DBSR_BT)@h /* clear the event */ + rlwinm r11,r11,0,~MSR_DE /* clear DE in the DSRR1 value */ + mtspr SPRN_DBSR,r14 + mtspr SPRN_DSRR1,r11 + lwz r10,PACA_EXDBG+EX_CR(r13) /* restore registers */ + ld r1,PACA_EXDBG+EX_R1(r13) + ld r14,PACA_EXDBG+EX_R14(r13) + ld r15,PACA_EXDBG+EX_R15(r13) + mtcr r10 + ld r10,PACA_EXDBG+EX_R10(r13) /* restore registers */ + ld r11,PACA_EXDBG+EX_R11(r13) + mfspr r13,SPRN_SPRG_DBG_SCRATCH + rfdi + + /* Normal debug exception */ + /* XXX We only handle coming from userspace for now since we can't + * quite save properly an interrupted kernel state yet + */ +1: andi. r14,r11,MSR_PR; /* check for userspace again */ + beq kernel_dbg_exc; /* if from kernel mode */ + + /* Now we mash up things to make it look like we are coming on a + * normal exception + */ + mfspr r14,SPRN_DBSR + std r14,_DSISR(r1) + ld r14,PACA_EXDBG+EX_R14(r13) + ld r15,PACA_EXDBG+EX_R15(r13) + EXCEPTION_COMMON_DBG(0xd08) + addi r3,r1,STACK_FRAME_OVERHEAD + bl DebugException + REST_NVGPRS(r1) + b interrupt_return + + START_EXCEPTION(perfmon); + NORMAL_EXCEPTION_PROLOG(0x260, BOOKE_INTERRUPT_PERFORMANCE_MONITOR, + PROLOG_ADDITION_NONE) + EXCEPTION_COMMON(0x260) + CHECK_NAPPING() + addi r3,r1,STACK_FRAME_OVERHEAD + /* + * XXX: Returning from performance_monitor_exception taken as a + * soft-NMI (Linux irqs disabled) may be risky to use interrupt_return + * and could cause bugs in return or elsewhere. That case should just + * restore registers and return. There is a workaround for one known + * problem in interrupt_exit_kernel_prepare(). + */ + bl performance_monitor_exception + b interrupt_return + +/* Doorbell interrupt */ + MASKABLE_EXCEPTION(0x280, BOOKE_INTERRUPT_DOORBELL, + doorbell, doorbell_exception, ACK_NONE) + +/* Doorbell critical Interrupt */ + START_EXCEPTION(doorbell_crit); + CRIT_EXCEPTION_PROLOG(0x2a0, BOOKE_INTERRUPT_DOORBELL_CRITICAL, + PROLOG_ADDITION_NONE) + EXCEPTION_COMMON_CRIT(0x2a0) + bl special_reg_save + CHECK_NAPPING(); + addi r3,r1,STACK_FRAME_OVERHEAD + bl unknown_nmi_exception + b ret_from_crit_except + +/* + * Guest doorbell interrupt + * This general exception use GSRRx save/restore registers + */ + START_EXCEPTION(guest_doorbell); + GDBELL_EXCEPTION_PROLOG(0x2c0, BOOKE_INTERRUPT_GUEST_DBELL, + PROLOG_ADDITION_NONE) + EXCEPTION_COMMON(0x2c0) + addi r3,r1,STACK_FRAME_OVERHEAD + bl unknown_exception + b interrupt_return + +/* Guest Doorbell critical Interrupt */ + START_EXCEPTION(guest_doorbell_crit); + CRIT_EXCEPTION_PROLOG(0x2e0, BOOKE_INTERRUPT_GUEST_DBELL_CRIT, + PROLOG_ADDITION_NONE) + EXCEPTION_COMMON_CRIT(0x2e0) + bl special_reg_save + CHECK_NAPPING(); + addi r3,r1,STACK_FRAME_OVERHEAD + bl unknown_nmi_exception + b ret_from_crit_except + +/* Hypervisor call */ + START_EXCEPTION(hypercall); + NORMAL_EXCEPTION_PROLOG(0x310, BOOKE_INTERRUPT_HV_SYSCALL, + PROLOG_ADDITION_NONE) + EXCEPTION_COMMON(0x310) + addi r3,r1,STACK_FRAME_OVERHEAD + bl unknown_exception + b interrupt_return + +/* Embedded Hypervisor priviledged */ + START_EXCEPTION(ehpriv); + NORMAL_EXCEPTION_PROLOG(0x320, BOOKE_INTERRUPT_HV_PRIV, + PROLOG_ADDITION_NONE) + EXCEPTION_COMMON(0x320) + addi r3,r1,STACK_FRAME_OVERHEAD + bl unknown_exception + b interrupt_return + +/* LRAT Error interrupt */ + START_EXCEPTION(lrat_error); + NORMAL_EXCEPTION_PROLOG(0x340, BOOKE_INTERRUPT_LRAT_ERROR, + PROLOG_ADDITION_NONE) + EXCEPTION_COMMON(0x340) + addi r3,r1,STACK_FRAME_OVERHEAD + bl unknown_exception + b interrupt_return + +.macro SEARCH_RESTART_TABLE +#ifdef CONFIG_RELOCATABLE + __LOAD_PACA_TOC(r11) + LOAD_REG_ADDR_ALTTOC(r14, r11, __start___restart_table) + LOAD_REG_ADDR_ALTTOC(r15, r11, __stop___restart_table) +#else + LOAD_REG_IMMEDIATE_SYM(r14, r11, __start___restart_table) + LOAD_REG_IMMEDIATE_SYM(r15, r11, __stop___restart_table) +#endif +300: + cmpd r14,r15 + beq 302f + ld r11,0(r14) + cmpld r10,r11 + blt 301f + ld r11,8(r14) + cmpld r10,r11 + bge 301f + ld r11,16(r14) + b 303f +301: + addi r14,r14,24 + b 300b +302: + li r11,0 +303: +.endm + +/* + * An interrupt came in while soft-disabled; We mark paca->irq_happened + * accordingly and if the interrupt is level sensitive, we hard disable + * hard disable (full_mask) corresponds to PACA_IRQ_MUST_HARD_MASK, so + * keep these in synch. + */ + +.macro masked_interrupt_book3e paca_irq full_mask + std r14,PACA_EXGEN+EX_R14(r13) + std r15,PACA_EXGEN+EX_R15(r13) + + lbz r10,PACAIRQHAPPENED(r13) + .if \full_mask == 1 + ori r10,r10,\paca_irq | PACA_IRQ_HARD_DIS + .else + ori r10,r10,\paca_irq + .endif + stb r10,PACAIRQHAPPENED(r13) + + .if \full_mask == 1 + xori r11,r11,MSR_EE /* clear MSR_EE */ + mtspr SPRN_SRR1,r11 + .endif + + mfspr r10,SPRN_SRR0 + SEARCH_RESTART_TABLE + cmpdi r11,0 + beq 1f + mtspr SPRN_SRR0,r11 /* return to restart address */ +1: + + lwz r11,PACA_EXGEN+EX_CR(r13) + mtcr r11 + ld r10,PACA_EXGEN+EX_R10(r13) + ld r11,PACA_EXGEN+EX_R11(r13) + ld r14,PACA_EXGEN+EX_R14(r13) + ld r15,PACA_EXGEN+EX_R15(r13) + mfspr r13,SPRN_SPRG_GEN_SCRATCH + rfi + b . +.endm + +masked_interrupt_book3e_0x500: + masked_interrupt_book3e PACA_IRQ_EE 1 + +masked_interrupt_book3e_0x900: + ACK_DEC(r10); + masked_interrupt_book3e PACA_IRQ_DEC 0 + +masked_interrupt_book3e_0x980: + ACK_FIT(r10); + masked_interrupt_book3e PACA_IRQ_DEC 0 + +masked_interrupt_book3e_0x280: +masked_interrupt_book3e_0x2c0: + masked_interrupt_book3e PACA_IRQ_DBELL 0 + +/* + * This is called from 0x300 and 0x400 handlers after the prologs with + * r14 and r15 containing the fault address and error code, with the + * original values stashed away in the PACA + */ +storage_fault_common: + addi r3,r1,STACK_FRAME_OVERHEAD + bl do_page_fault + b interrupt_return + +/* + * Alignment exception doesn't fit entirely in the 0x100 bytes so it + * continues here. + */ +alignment_more: + addi r3,r1,STACK_FRAME_OVERHEAD + bl alignment_exception + REST_NVGPRS(r1) + b interrupt_return + +/* + * Trampolines used when spotting a bad kernel stack pointer in + * the exception entry code. + * + * TODO: move some bits like SRR0 read to trampoline, pass PACA + * index around, etc... to handle crit & mcheck + */ +BAD_STACK_TRAMPOLINE(0x000) +BAD_STACK_TRAMPOLINE(0x100) +BAD_STACK_TRAMPOLINE(0x200) +BAD_STACK_TRAMPOLINE(0x220) +BAD_STACK_TRAMPOLINE(0x260) +BAD_STACK_TRAMPOLINE(0x280) +BAD_STACK_TRAMPOLINE(0x2a0) +BAD_STACK_TRAMPOLINE(0x2c0) +BAD_STACK_TRAMPOLINE(0x2e0) +BAD_STACK_TRAMPOLINE(0x300) +BAD_STACK_TRAMPOLINE(0x310) +BAD_STACK_TRAMPOLINE(0x320) +BAD_STACK_TRAMPOLINE(0x340) +BAD_STACK_TRAMPOLINE(0x400) +BAD_STACK_TRAMPOLINE(0x500) +BAD_STACK_TRAMPOLINE(0x600) +BAD_STACK_TRAMPOLINE(0x700) +BAD_STACK_TRAMPOLINE(0x800) +BAD_STACK_TRAMPOLINE(0x900) +BAD_STACK_TRAMPOLINE(0x980) +BAD_STACK_TRAMPOLINE(0x9f0) +BAD_STACK_TRAMPOLINE(0xa00) +BAD_STACK_TRAMPOLINE(0xb00) +BAD_STACK_TRAMPOLINE(0xc00) +BAD_STACK_TRAMPOLINE(0xd00) +BAD_STACK_TRAMPOLINE(0xd08) +BAD_STACK_TRAMPOLINE(0xe00) +BAD_STACK_TRAMPOLINE(0xf00) +BAD_STACK_TRAMPOLINE(0xf20) + + .globl bad_stack_book3e +bad_stack_book3e: + /* XXX: Needs to make SPRN_SPRG_GEN depend on exception type */ + mfspr r10,SPRN_SRR0; /* read SRR0 before touching stack */ + ld r1,PACAEMERGSP(r13) + subi r1,r1,64+INT_FRAME_SIZE + std r10,_NIP(r1) + std r11,_MSR(r1) + ld r10,PACA_EXGEN+EX_R1(r13) /* FIXME for crit & mcheck */ + lwz r11,PACA_EXGEN+EX_CR(r13) /* FIXME for crit & mcheck */ + std r10,GPR1(r1) + std r11,_CCR(r1) + mfspr r10,SPRN_DEAR + mfspr r11,SPRN_ESR + std r10,_DEAR(r1) + std r11,_ESR(r1) + SAVE_GPR(0, r1); /* save r0 in stackframe */ \ + SAVE_GPRS(2, 9, r1); /* save r2 - r9 in stackframe */ \ + ld r3,PACA_EXGEN+EX_R10(r13);/* get back r10 */ \ + ld r4,PACA_EXGEN+EX_R11(r13);/* get back r11 */ \ + mfspr r5,SPRN_SPRG_GEN_SCRATCH;/* get back r13 XXX can be wrong */ \ + std r3,GPR10(r1); /* save r10 to stackframe */ \ + std r4,GPR11(r1); /* save r11 to stackframe */ \ + SAVE_GPR(12, r1); /* save r12 in stackframe */ \ + std r5,GPR13(r1); /* save it to stackframe */ \ + mflr r10 + mfctr r11 + mfxer r12 + std r10,_LINK(r1) + std r11,_CTR(r1) + std r12,_XER(r1) + SAVE_NVGPRS(r1) + lhz r12,PACA_TRAP_SAVE(r13) + std r12,_TRAP(r1) + addi r11,r1,INT_FRAME_SIZE + std r11,0(r1) + ZEROIZE_GPR(12) + std r12,0(r11) + LOAD_PACA_TOC() +1: addi r3,r1,STACK_FRAME_OVERHEAD + bl kernel_bad_stack + b 1b + +/* + * Setup the initial TLB for a core. This current implementation + * assume that whatever we are running off will not conflict with + * the new mapping at PAGE_OFFSET. + */ +_GLOBAL(initial_tlb_book3e) + + /* Look for the first TLB with IPROT set */ + mfspr r4,SPRN_TLB0CFG + andi. r3,r4,TLBnCFG_IPROT + lis r3,MAS0_TLBSEL(0)@h + bne found_iprot + + mfspr r4,SPRN_TLB1CFG + andi. r3,r4,TLBnCFG_IPROT + lis r3,MAS0_TLBSEL(1)@h + bne found_iprot + + mfspr r4,SPRN_TLB2CFG + andi. r3,r4,TLBnCFG_IPROT + lis r3,MAS0_TLBSEL(2)@h + bne found_iprot + + lis r3,MAS0_TLBSEL(3)@h + mfspr r4,SPRN_TLB3CFG + /* fall through */ + +found_iprot: + andi. r5,r4,TLBnCFG_HES + bne have_hes + + mflr r8 /* save LR */ +/* 1. Find the index of the entry we're executing in + * + * r3 = MAS0_TLBSEL (for the iprot array) + * r4 = SPRN_TLBnCFG + */ + bcl 20,31,$+4 /* Find our address */ +invstr: mflr r6 /* Make it accessible */ + mfmsr r7 + rlwinm r5,r7,27,31,31 /* extract MSR[IS] */ + mfspr r7,SPRN_PID + slwi r7,r7,16 + or r7,r7,r5 + mtspr SPRN_MAS6,r7 + tlbsx 0,r6 /* search MSR[IS], SPID=PID */ + + mfspr r3,SPRN_MAS0 + rlwinm r5,r3,16,20,31 /* Extract MAS0(Entry) */ + + mfspr r7,SPRN_MAS1 /* Insure IPROT set */ + oris r7,r7,MAS1_IPROT@h + mtspr SPRN_MAS1,r7 + tlbwe + +/* 2. Invalidate all entries except the entry we're executing in + * + * r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in + * r4 = SPRN_TLBnCFG + * r5 = ESEL of entry we are running in + */ + andi. r4,r4,TLBnCFG_N_ENTRY /* Extract # entries */ + li r6,0 /* Set Entry counter to 0 */ +1: mr r7,r3 /* Set MAS0(TLBSEL) */ + rlwimi r7,r6,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r6) */ + mtspr SPRN_MAS0,r7 + tlbre + mfspr r7,SPRN_MAS1 + rlwinm r7,r7,0,2,31 /* Clear MAS1 Valid and IPROT */ + cmpw r5,r6 + beq skpinv /* Dont update the current execution TLB */ + mtspr SPRN_MAS1,r7 + tlbwe + isync +skpinv: addi r6,r6,1 /* Increment */ + cmpw r6,r4 /* Are we done? */ + bne 1b /* If not, repeat */ + + /* Invalidate all TLBs */ + PPC_TLBILX_ALL(0,R0) + sync + isync + +/* 3. Setup a temp mapping and jump to it + * + * r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in + * r5 = ESEL of entry we are running in + */ + andi. r7,r5,0x1 /* Find an entry not used and is non-zero */ + addi r7,r7,0x1 + mr r4,r3 /* Set MAS0(TLBSEL) = 1 */ + mtspr SPRN_MAS0,r4 + tlbre + + rlwimi r4,r7,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r7) */ + mtspr SPRN_MAS0,r4 + + mfspr r7,SPRN_MAS1 + xori r6,r7,MAS1_TS /* Setup TMP mapping in the other Address space */ + mtspr SPRN_MAS1,r6 + + tlbwe + + mfmsr r6 + xori r6,r6,MSR_IS + mtspr SPRN_SRR1,r6 + bcl 20,31,$+4 /* Find our address */ +1: mflr r6 + addi r6,r6,(2f - 1b) + mtspr SPRN_SRR0,r6 + rfi +2: + +/* 4. Clear out PIDs & Search info + * + * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in + * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping + * r5 = MAS3 + */ + li r6,0 + mtspr SPRN_MAS6,r6 + mtspr SPRN_PID,r6 + +/* 5. Invalidate mapping we started in + * + * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in + * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping + * r5 = MAS3 + */ + mtspr SPRN_MAS0,r3 + tlbre + mfspr r6,SPRN_MAS1 + rlwinm r6,r6,0,2,31 /* clear IPROT and VALID */ + mtspr SPRN_MAS1,r6 + tlbwe + sync + isync + +/* 6. Setup KERNELBASE mapping in TLB[0] + * + * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in + * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping + * r5 = MAS3 + */ + rlwinm r3,r3,0,16,3 /* clear ESEL */ + mtspr SPRN_MAS0,r3 + lis r6,(MAS1_VALID|MAS1_IPROT)@h + ori r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_1GB))@l + mtspr SPRN_MAS1,r6 + + LOAD_REG_IMMEDIATE(r6, PAGE_OFFSET | MAS2_M_IF_NEEDED) + mtspr SPRN_MAS2,r6 + + rlwinm r5,r5,0,0,25 + ori r5,r5,MAS3_SR | MAS3_SW | MAS3_SX + mtspr SPRN_MAS3,r5 + li r5,-1 + rlwinm r5,r5,0,0,25 + + tlbwe + +/* 7. Jump to KERNELBASE mapping + * + * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping + */ + /* Now we branch the new virtual address mapped by this entry */ + bcl 20,31,$+4 /* Find our address */ +1: mflr r6 + addi r6,r6,(2f - 1b) + tovirt(r6,r6) + lis r7,MSR_KERNEL@h + ori r7,r7,MSR_KERNEL@l + mtspr SPRN_SRR0,r6 + mtspr SPRN_SRR1,r7 + rfi /* start execution out of TLB1[0] entry */ +2: + +/* 8. Clear out the temp mapping + * + * r4 = MAS0 w/TLBSEL & ESEL for the entry we are running in + */ + mtspr SPRN_MAS0,r4 + tlbre + mfspr r5,SPRN_MAS1 + rlwinm r5,r5,0,2,31 /* clear IPROT and VALID */ + mtspr SPRN_MAS1,r5 + tlbwe + sync + isync + + /* We translate LR and return */ + tovirt(r8,r8) + mtlr r8 + blr + +have_hes: + /* Setup MAS 0,1,2,3 and 7 for tlbwe of a 1G entry that maps the + * kernel linear mapping. We also set MAS8 once for all here though + * that will have to be made dependent on whether we are running under + * a hypervisor I suppose. + */ + + /* BEWARE, MAGIC + * This code is called as an ordinary function on the boot CPU. But to + * avoid duplication, this code is also used in SCOM bringup of + * secondary CPUs. We read the code between the initial_tlb_code_start + * and initial_tlb_code_end labels one instruction at a time and RAM it + * into the new core via SCOM. That doesn't process branches, so there + * must be none between those two labels. It also means if this code + * ever takes any parameters, the SCOM code must also be updated to + * provide them. + */ + .globl a2_tlbinit_code_start +a2_tlbinit_code_start: + + ori r11,r3,MAS0_WQ_ALLWAYS + oris r11,r11,MAS0_ESEL(3)@h /* Use way 3: workaround A2 erratum 376 */ + mtspr SPRN_MAS0,r11 + lis r3,(MAS1_VALID | MAS1_IPROT)@h + ori r3,r3,BOOK3E_PAGESZ_1GB << MAS1_TSIZE_SHIFT + mtspr SPRN_MAS1,r3 + LOAD_REG_IMMEDIATE(r3, PAGE_OFFSET | MAS2_M) + mtspr SPRN_MAS2,r3 + li r3,MAS3_SR | MAS3_SW | MAS3_SX + mtspr SPRN_MAS7_MAS3,r3 + li r3,0 + mtspr SPRN_MAS8,r3 + + /* Write the TLB entry */ + tlbwe + + .globl a2_tlbinit_after_linear_map +a2_tlbinit_after_linear_map: + + /* Now we branch the new virtual address mapped by this entry */ +#ifdef CONFIG_RELOCATABLE + __LOAD_PACA_TOC(r5) + LOAD_REG_ADDR_ALTTOC(r3, r5, 1f) +#else + LOAD_REG_IMMEDIATE_SYM(r3, r5, 1f) +#endif + mtctr r3 + bctr + +1: /* We are now running at PAGE_OFFSET, clean the TLB of everything + * else (including IPROTed things left by firmware) + * r4 = TLBnCFG + * r3 = current address (more or less) + */ + + li r5,0 + mtspr SPRN_MAS6,r5 + tlbsx 0,r3 + + rlwinm r9,r4,0,TLBnCFG_N_ENTRY + rlwinm r10,r4,8,0xff + addi r10,r10,-1 /* Get inner loop mask */ + + li r3,1 + + mfspr r5,SPRN_MAS1 + rlwinm r5,r5,0,(~(MAS1_VALID|MAS1_IPROT)) + + mfspr r6,SPRN_MAS2 + rldicr r6,r6,0,51 /* Extract EPN */ + + mfspr r7,SPRN_MAS0 + rlwinm r7,r7,0,0xffff0fff /* Clear HES and WQ */ + + rlwinm r8,r7,16,0xfff /* Extract ESEL */ + +2: add r4,r3,r8 + and r4,r4,r10 + + rlwimi r7,r4,16,MAS0_ESEL_MASK + + mtspr SPRN_MAS0,r7 + mtspr SPRN_MAS1,r5 + mtspr SPRN_MAS2,r6 + tlbwe + + addi r3,r3,1 + and. r4,r3,r10 + + bne 3f + addis r6,r6,(1<<30)@h +3: + cmpw r3,r9 + blt 2b + + .globl a2_tlbinit_after_iprot_flush +a2_tlbinit_after_iprot_flush: + + PPC_TLBILX(0,0,R0) + sync + isync + + .globl a2_tlbinit_code_end +a2_tlbinit_code_end: + + /* We translate LR and return */ + mflr r3 + tovirt(r3,r3) + mtlr r3 + blr + +/* + * Main entry (boot CPU, thread 0) + * + * We enter here from head_64.S, possibly after the prom_init trampoline + * with r3 and r4 already saved to r31 and 30 respectively and in 64 bits + * mode. Anything else is as it was left by the bootloader + * + * Initial requirements of this port: + * + * - Kernel loaded at 0 physical + * - A good lump of memory mapped 0:0 by UTLB entry 0 + * - MSR:IS & MSR:DS set to 0 + * + * Note that some of the above requirements will be relaxed in the future + * as the kernel becomes smarter at dealing with different initial conditions + * but for now you have to be careful + */ +_GLOBAL(start_initialization_book3e) + mflr r28 + + /* First, we need to setup some initial TLBs to map the kernel + * text, data and bss at PAGE_OFFSET. We don't have a real mode + * and always use AS 0, so we just set it up to match our link + * address and never use 0 based addresses. + */ + bl initial_tlb_book3e + + /* Init global core bits */ + bl init_core_book3e + + /* Init per-thread bits */ + bl init_thread_book3e + + /* Return to common init code */ + tovirt(r28,r28) + mtlr r28 + blr + + +/* + * Secondary core/processor entry + * + * This is entered for thread 0 of a secondary core, all other threads + * are expected to be stopped. It's similar to start_initialization_book3e + * except that it's generally entered from the holding loop in head_64.S + * after CPUs have been gathered by Open Firmware. + * + * We assume we are in 32 bits mode running with whatever TLB entry was + * set for us by the firmware or POR engine. + */ +_GLOBAL(book3e_secondary_core_init_tlb_set) + li r4,1 + b generic_secondary_smp_init + +_GLOBAL(book3e_secondary_core_init) + mflr r28 + + /* Do we need to setup initial TLB entry ? */ + cmplwi r4,0 + bne 2f + + /* Setup TLB for this core */ + bl initial_tlb_book3e + + /* We can return from the above running at a different + * address, so recalculate r2 (TOC) + */ + bl relative_toc + + /* Init global core bits */ +2: bl init_core_book3e + + /* Init per-thread bits */ +3: bl init_thread_book3e + + /* Return to common init code at proper virtual address. + * + * Due to various previous assumptions, we know we entered this + * function at either the final PAGE_OFFSET mapping or using a + * 1:1 mapping at 0, so we don't bother doing a complicated check + * here, we just ensure the return address has the right top bits. + * + * Note that if we ever want to be smarter about where we can be + * started from, we have to be careful that by the time we reach + * the code below we may already be running at a different location + * than the one we were called from since initial_tlb_book3e can + * have moved us already. + */ + cmpdi cr0,r28,0 + blt 1f + lis r3,PAGE_OFFSET@highest + sldi r3,r3,32 + or r28,r28,r3 +1: mtlr r28 + blr + +_GLOBAL(book3e_secondary_thread_init) + mflr r28 + b 3b + + .globl init_core_book3e +init_core_book3e: + /* Establish the interrupt vector base */ + tovirt(r2,r2) + LOAD_REG_ADDR(r3, interrupt_base_book3e) + mtspr SPRN_IVPR,r3 + sync + blr + +init_thread_book3e: + lis r3,(SPRN_EPCR_ICM | SPRN_EPCR_GICM)@h + mtspr SPRN_EPCR,r3 + + /* Make sure interrupts are off */ + wrteei 0 + + /* disable all timers and clear out status */ + li r3,0 + mtspr SPRN_TCR,r3 + mfspr r3,SPRN_TSR + mtspr SPRN_TSR,r3 + + blr + +_GLOBAL(__setup_base_ivors) + SET_IVOR(0, 0x020) /* Critical Input */ + SET_IVOR(1, 0x000) /* Machine Check */ + SET_IVOR(2, 0x060) /* Data Storage */ + SET_IVOR(3, 0x080) /* Instruction Storage */ + SET_IVOR(4, 0x0a0) /* External Input */ + SET_IVOR(5, 0x0c0) /* Alignment */ + SET_IVOR(6, 0x0e0) /* Program */ + SET_IVOR(7, 0x100) /* FP Unavailable */ + SET_IVOR(8, 0x120) /* System Call */ + SET_IVOR(9, 0x140) /* Auxiliary Processor Unavailable */ + SET_IVOR(10, 0x160) /* Decrementer */ + SET_IVOR(11, 0x180) /* Fixed Interval Timer */ + SET_IVOR(12, 0x1a0) /* Watchdog Timer */ + SET_IVOR(13, 0x1c0) /* Data TLB Error */ + SET_IVOR(14, 0x1e0) /* Instruction TLB Error */ + SET_IVOR(15, 0x040) /* Debug */ + + sync + + blr + +_GLOBAL(setup_altivec_ivors) + SET_IVOR(32, 0x200) /* AltiVec Unavailable */ + SET_IVOR(33, 0x220) /* AltiVec Assist */ + blr + +_GLOBAL(setup_perfmon_ivor) + SET_IVOR(35, 0x260) /* Performance Monitor */ + blr + +_GLOBAL(setup_doorbell_ivors) + SET_IVOR(36, 0x280) /* Processor Doorbell */ + SET_IVOR(37, 0x2a0) /* Processor Doorbell Crit */ + blr + +_GLOBAL(setup_ehv_ivors) + SET_IVOR(40, 0x300) /* Embedded Hypervisor System Call */ + SET_IVOR(41, 0x320) /* Embedded Hypervisor Privilege */ + SET_IVOR(38, 0x2c0) /* Guest Processor Doorbell */ + SET_IVOR(39, 0x2e0) /* Guest Processor Doorbell Crit/MC */ + blr + +_GLOBAL(setup_lrat_ivor) + SET_IVOR(42, 0x340) /* LRAT Error */ + blr diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S new file mode 100644 index 000000000..651c36b05 --- /dev/null +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -0,0 +1,3139 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * This file contains the 64-bit "server" PowerPC variant + * of the low level exception handling including exception + * vectors, exception return, part of the slb and stab + * handling and other fixed offset specific things. + * + * This file is meant to be #included from head_64.S due to + * position dependent assembly. + * + * Most of this originates from head_64.S and thus has the same + * copyright history. + * + */ + +#include <asm/hw_irq.h> +#include <asm/exception-64s.h> +#include <asm/ptrace.h> +#include <asm/cpuidle.h> +#include <asm/head-64.h> +#include <asm/feature-fixups.h> +#include <asm/kup.h> + +/* + * Following are fixed section helper macros. + * + * EXC_REAL_BEGIN/END - real, unrelocated exception vectors + * EXC_VIRT_BEGIN/END - virt (AIL), unrelocated exception vectors + * TRAMP_REAL_BEGIN - real, unrelocated helpers (virt may call these) + * TRAMP_VIRT_BEGIN - virt, unreloc helpers (in practice, real can use) + * EXC_COMMON - After switching to virtual, relocated mode. + */ + +#define EXC_REAL_BEGIN(name, start, size) \ + FIXED_SECTION_ENTRY_BEGIN_LOCATION(real_vectors, exc_real_##start##_##name, start, size) + +#define EXC_REAL_END(name, start, size) \ + FIXED_SECTION_ENTRY_END_LOCATION(real_vectors, exc_real_##start##_##name, start, size) + +#define EXC_VIRT_BEGIN(name, start, size) \ + FIXED_SECTION_ENTRY_BEGIN_LOCATION(virt_vectors, exc_virt_##start##_##name, start, size) + +#define EXC_VIRT_END(name, start, size) \ + FIXED_SECTION_ENTRY_END_LOCATION(virt_vectors, exc_virt_##start##_##name, start, size) + +#define EXC_COMMON_BEGIN(name) \ + USE_TEXT_SECTION(); \ + .balign IFETCH_ALIGN_BYTES; \ + .global name; \ + _ASM_NOKPROBE_SYMBOL(name); \ + DEFINE_FIXED_SYMBOL(name, text); \ +name: + +#define TRAMP_REAL_BEGIN(name) \ + FIXED_SECTION_ENTRY_BEGIN(real_trampolines, name) + +#define TRAMP_VIRT_BEGIN(name) \ + FIXED_SECTION_ENTRY_BEGIN(virt_trampolines, name) + +#define EXC_REAL_NONE(start, size) \ + FIXED_SECTION_ENTRY_BEGIN_LOCATION(real_vectors, exc_real_##start##_##unused, start, size); \ + FIXED_SECTION_ENTRY_END_LOCATION(real_vectors, exc_real_##start##_##unused, start, size) + +#define EXC_VIRT_NONE(start, size) \ + FIXED_SECTION_ENTRY_BEGIN_LOCATION(virt_vectors, exc_virt_##start##_##unused, start, size); \ + FIXED_SECTION_ENTRY_END_LOCATION(virt_vectors, exc_virt_##start##_##unused, start, size) + +/* + * We're short on space and time in the exception prolog, so we can't + * use the normal LOAD_REG_IMMEDIATE macro to load the address of label. + * Instead we get the base of the kernel from paca->kernelbase and or in the low + * part of label. This requires that the label be within 64KB of kernelbase, and + * that kernelbase be 64K aligned. + */ +#define LOAD_HANDLER(reg, label) \ + ld reg,PACAKBASE(r13); /* get high part of &label */ \ + ori reg,reg,FIXED_SYMBOL_ABS_ADDR(label) + +#define __LOAD_HANDLER(reg, label, section) \ + ld reg,PACAKBASE(r13); \ + ori reg,reg,(ABS_ADDR(label, section))@l + +/* + * Branches from unrelocated code (e.g., interrupts) to labels outside + * head-y require >64K offsets. + */ +#define __LOAD_FAR_HANDLER(reg, label, section) \ + ld reg,PACAKBASE(r13); \ + ori reg,reg,(ABS_ADDR(label, section))@l; \ + addis reg,reg,(ABS_ADDR(label, section))@h + +/* + * Interrupt code generation macros + */ +#define IVEC .L_IVEC_\name\() /* Interrupt vector address */ +#define IHSRR .L_IHSRR_\name\() /* Sets SRR or HSRR registers */ +#define IHSRR_IF_HVMODE .L_IHSRR_IF_HVMODE_\name\() /* HSRR if HV else SRR */ +#define IAREA .L_IAREA_\name\() /* PACA save area */ +#define IVIRT .L_IVIRT_\name\() /* Has virt mode entry point */ +#define IISIDE .L_IISIDE_\name\() /* Uses SRR0/1 not DAR/DSISR */ +#define ICFAR .L_ICFAR_\name\() /* Uses CFAR */ +#define ICFAR_IF_HVMODE .L_ICFAR_IF_HVMODE_\name\() /* Uses CFAR if HV */ +#define IDAR .L_IDAR_\name\() /* Uses DAR (or SRR0) */ +#define IDSISR .L_IDSISR_\name\() /* Uses DSISR (or SRR1) */ +#define IBRANCH_TO_COMMON .L_IBRANCH_TO_COMMON_\name\() /* ENTRY branch to common */ +#define IREALMODE_COMMON .L_IREALMODE_COMMON_\name\() /* Common runs in realmode */ +#define IMASK .L_IMASK_\name\() /* IRQ soft-mask bit */ +#define IKVM_REAL .L_IKVM_REAL_\name\() /* Real entry tests KVM */ +#define __IKVM_REAL(name) .L_IKVM_REAL_ ## name +#define IKVM_VIRT .L_IKVM_VIRT_\name\() /* Virt entry tests KVM */ +#define ISTACK .L_ISTACK_\name\() /* Set regular kernel stack */ +#define __ISTACK(name) .L_ISTACK_ ## name +#define IKUAP .L_IKUAP_\name\() /* Do KUAP lock */ + +#define INT_DEFINE_BEGIN(n) \ +.macro int_define_ ## n name + +#define INT_DEFINE_END(n) \ +.endm ; \ +int_define_ ## n n ; \ +do_define_int n + +.macro do_define_int name + .ifndef IVEC + .error "IVEC not defined" + .endif + .ifndef IHSRR + IHSRR=0 + .endif + .ifndef IHSRR_IF_HVMODE + IHSRR_IF_HVMODE=0 + .endif + .ifndef IAREA + IAREA=PACA_EXGEN + .endif + .ifndef IVIRT + IVIRT=1 + .endif + .ifndef IISIDE + IISIDE=0 + .endif + .ifndef ICFAR + ICFAR=1 + .endif + .ifndef ICFAR_IF_HVMODE + ICFAR_IF_HVMODE=0 + .endif + .ifndef IDAR + IDAR=0 + .endif + .ifndef IDSISR + IDSISR=0 + .endif + .ifndef IBRANCH_TO_COMMON + IBRANCH_TO_COMMON=1 + .endif + .ifndef IREALMODE_COMMON + IREALMODE_COMMON=0 + .else + .if ! IBRANCH_TO_COMMON + .error "IREALMODE_COMMON=1 but IBRANCH_TO_COMMON=0" + .endif + .endif + .ifndef IMASK + IMASK=0 + .endif + .ifndef IKVM_REAL + IKVM_REAL=0 + .endif + .ifndef IKVM_VIRT + IKVM_VIRT=0 + .endif + .ifndef ISTACK + ISTACK=1 + .endif + .ifndef IKUAP + IKUAP=1 + .endif +.endm + +/* + * All interrupts which set HSRR registers, as well as SRESET and MCE and + * syscall when invoked with "sc 1" switch to MSR[HV]=1 (HVMODE) to be taken, + * so they all generally need to test whether they were taken in guest context. + * + * Note: SRESET and MCE may also be sent to the guest by the hypervisor, and be + * taken with MSR[HV]=0. + * + * Interrupts which set SRR registers (with the above exceptions) do not + * elevate to MSR[HV]=1 mode, though most can be taken when running with + * MSR[HV]=1 (e.g., bare metal kernel and userspace). So these interrupts do + * not need to test whether a guest is running because they get delivered to + * the guest directly, including nested HV KVM guests. + * + * The exception is PR KVM, where the guest runs with MSR[PR]=1 and the host + * runs with MSR[HV]=0, so the host takes all interrupts on behalf of the + * guest. PR KVM runs with LPCR[AIL]=0 which causes interrupts to always be + * delivered to the real-mode entry point, therefore such interrupts only test + * KVM in their real mode handlers, and only when PR KVM is possible. + * + * Interrupts that are taken in MSR[HV]=0 and escalate to MSR[HV]=1 are always + * delivered in real-mode when the MMU is in hash mode because the MMU + * registers are not set appropriately to translate host addresses. In nested + * radix mode these can be delivered in virt-mode as the host translations are + * used implicitly (see: effective LPID, effective PID). + */ + +/* + * If an interrupt is taken while a guest is running, it is immediately routed + * to KVM to handle. + */ + +.macro KVMTEST name handler +#ifdef CONFIG_KVM_BOOK3S_64_HANDLER + lbz r10,HSTATE_IN_GUEST(r13) + cmpwi r10,0 + /* HSRR variants have the 0x2 bit added to their trap number */ + .if IHSRR_IF_HVMODE + BEGIN_FTR_SECTION + li r10,(IVEC + 0x2) + FTR_SECTION_ELSE + li r10,(IVEC) + ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) + .elseif IHSRR + li r10,(IVEC + 0x2) + .else + li r10,(IVEC) + .endif + bne \handler +#endif +.endm + +/* + * This is the BOOK3S interrupt entry code macro. + * + * This can result in one of several things happening: + * - Branch to the _common handler, relocated, in virtual mode. + * These are normal interrupts (synchronous and asynchronous) handled by + * the kernel. + * - Branch to KVM, relocated but real mode interrupts remain in real mode. + * These occur when HSTATE_IN_GUEST is set. The interrupt may be caused by + * / intended for host or guest kernel, but KVM must always be involved + * because the machine state is set for guest execution. + * - Branch to the masked handler, unrelocated. + * These occur when maskable asynchronous interrupts are taken with the + * irq_soft_mask set. + * - Branch to an "early" handler in real mode but relocated. + * This is done if early=1. MCE and HMI use these to handle errors in real + * mode. + * - Fall through and continue executing in real, unrelocated mode. + * This is done if early=2. + */ + +.macro GEN_BRANCH_TO_COMMON name, virt + .if IREALMODE_COMMON + LOAD_HANDLER(r10, \name\()_common) + mtctr r10 + bctr + .else + .if \virt +#ifndef CONFIG_RELOCATABLE + b \name\()_common_virt +#else + LOAD_HANDLER(r10, \name\()_common_virt) + mtctr r10 + bctr +#endif + .else + LOAD_HANDLER(r10, \name\()_common_real) + mtctr r10 + bctr + .endif + .endif +.endm + +.macro GEN_INT_ENTRY name, virt, ool=0 + SET_SCRATCH0(r13) /* save r13 */ + GET_PACA(r13) + std r9,IAREA+EX_R9(r13) /* save r9 */ +BEGIN_FTR_SECTION + mfspr r9,SPRN_PPR +END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) + HMT_MEDIUM + std r10,IAREA+EX_R10(r13) /* save r10 */ + .if ICFAR +BEGIN_FTR_SECTION + mfspr r10,SPRN_CFAR +END_FTR_SECTION_IFSET(CPU_FTR_CFAR) + .elseif ICFAR_IF_HVMODE +BEGIN_FTR_SECTION + BEGIN_FTR_SECTION_NESTED(69) + mfspr r10,SPRN_CFAR + END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 69) +FTR_SECTION_ELSE + BEGIN_FTR_SECTION_NESTED(69) + li r10,0 + END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 69) +ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) + .endif + .if \ool + .if !\virt + b tramp_real_\name + .pushsection .text + TRAMP_REAL_BEGIN(tramp_real_\name) + .else + b tramp_virt_\name + .pushsection .text + TRAMP_VIRT_BEGIN(tramp_virt_\name) + .endif + .endif + +BEGIN_FTR_SECTION + std r9,IAREA+EX_PPR(r13) +END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) + .if ICFAR || ICFAR_IF_HVMODE +BEGIN_FTR_SECTION + std r10,IAREA+EX_CFAR(r13) +END_FTR_SECTION_IFSET(CPU_FTR_CFAR) + .endif + INTERRUPT_TO_KERNEL + mfctr r10 + std r10,IAREA+EX_CTR(r13) + mfcr r9 + std r11,IAREA+EX_R11(r13) /* save r11 - r12 */ + std r12,IAREA+EX_R12(r13) + + /* + * DAR/DSISR, SCRATCH0 must be read before setting MSR[RI], + * because a d-side MCE will clobber those registers so is + * not recoverable if they are live. + */ + GET_SCRATCH0(r10) + std r10,IAREA+EX_R13(r13) + .if IDAR && !IISIDE + .if IHSRR + mfspr r10,SPRN_HDAR + .else + mfspr r10,SPRN_DAR + .endif + std r10,IAREA+EX_DAR(r13) + .endif + .if IDSISR && !IISIDE + .if IHSRR + mfspr r10,SPRN_HDSISR + .else + mfspr r10,SPRN_DSISR + .endif + stw r10,IAREA+EX_DSISR(r13) + .endif + + .if IHSRR_IF_HVMODE + BEGIN_FTR_SECTION + mfspr r11,SPRN_HSRR0 /* save HSRR0 */ + mfspr r12,SPRN_HSRR1 /* and HSRR1 */ + FTR_SECTION_ELSE + mfspr r11,SPRN_SRR0 /* save SRR0 */ + mfspr r12,SPRN_SRR1 /* and SRR1 */ + ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) + .elseif IHSRR + mfspr r11,SPRN_HSRR0 /* save HSRR0 */ + mfspr r12,SPRN_HSRR1 /* and HSRR1 */ + .else + mfspr r11,SPRN_SRR0 /* save SRR0 */ + mfspr r12,SPRN_SRR1 /* and SRR1 */ + .endif + + .if IBRANCH_TO_COMMON + GEN_BRANCH_TO_COMMON \name \virt + .endif + + .if \ool + .popsection + .endif +.endm + +/* + * __GEN_COMMON_ENTRY is required to receive the branch from interrupt + * entry, except in the case of the real-mode handlers which require + * __GEN_REALMODE_COMMON_ENTRY. + * + * This switches to virtual mode and sets MSR[RI]. + */ +.macro __GEN_COMMON_ENTRY name +DEFINE_FIXED_SYMBOL(\name\()_common_real, text) +\name\()_common_real: + .if IKVM_REAL + KVMTEST \name kvm_interrupt + .endif + + ld r10,PACAKMSR(r13) /* get MSR value for kernel */ + /* MSR[RI] is clear iff using SRR regs */ + .if IHSRR_IF_HVMODE + BEGIN_FTR_SECTION + xori r10,r10,MSR_RI + END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE) + .elseif ! IHSRR + xori r10,r10,MSR_RI + .endif + mtmsrd r10 + + .if IVIRT + .if IKVM_VIRT + b 1f /* skip the virt test coming from real */ + .endif + + .balign IFETCH_ALIGN_BYTES +DEFINE_FIXED_SYMBOL(\name\()_common_virt, text) +\name\()_common_virt: + .if IKVM_VIRT + KVMTEST \name kvm_interrupt +1: + .endif + .endif /* IVIRT */ +.endm + +/* + * Don't switch to virt mode. Used for early MCE and HMI handlers that + * want to run in real mode. + */ +.macro __GEN_REALMODE_COMMON_ENTRY name +DEFINE_FIXED_SYMBOL(\name\()_common_real, text) +\name\()_common_real: + .if IKVM_REAL + KVMTEST \name kvm_interrupt + .endif +.endm + +.macro __GEN_COMMON_BODY name + .if IMASK + .if ! ISTACK + .error "No support for masked interrupt to use custom stack" + .endif + + /* If coming from user, skip soft-mask tests. */ + andi. r10,r12,MSR_PR + bne 3f + + /* + * Kernel code running below __end_soft_masked may be + * implicitly soft-masked if it is within the regions + * in the soft mask table. + */ + LOAD_HANDLER(r10, __end_soft_masked) + cmpld r11,r10 + bge+ 1f + + /* SEARCH_SOFT_MASK_TABLE clobbers r9,r10,r12 */ + mtctr r12 + stw r9,PACA_EXGEN+EX_CCR(r13) + SEARCH_SOFT_MASK_TABLE + cmpdi r12,0 + mfctr r12 /* Restore r12 to SRR1 */ + lwz r9,PACA_EXGEN+EX_CCR(r13) + beq 1f /* Not in soft-mask table */ + li r10,IMASK + b 2f /* In soft-mask table, always mask */ + + /* Test the soft mask state against our interrupt's bit */ +1: lbz r10,PACAIRQSOFTMASK(r13) +2: andi. r10,r10,IMASK + /* Associate vector numbers with bits in paca->irq_happened */ + .if IVEC == 0x500 || IVEC == 0xea0 + li r10,PACA_IRQ_EE + .elseif IVEC == 0x900 + li r10,PACA_IRQ_DEC + .elseif IVEC == 0xa00 || IVEC == 0xe80 + li r10,PACA_IRQ_DBELL + .elseif IVEC == 0xe60 + li r10,PACA_IRQ_HMI + .elseif IVEC == 0xf00 + li r10,PACA_IRQ_PMI + .else + .abort "Bad maskable vector" + .endif + + .if IHSRR_IF_HVMODE + BEGIN_FTR_SECTION + bne masked_Hinterrupt + FTR_SECTION_ELSE + bne masked_interrupt + ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) + .elseif IHSRR + bne masked_Hinterrupt + .else + bne masked_interrupt + .endif + .endif + + .if ISTACK + andi. r10,r12,MSR_PR /* See if coming from user */ +3: mr r10,r1 /* Save r1 */ + subi r1,r1,INT_FRAME_SIZE /* alloc frame on kernel stack */ + beq- 100f + ld r1,PACAKSAVE(r13) /* kernel stack to use */ +100: tdgei r1,-INT_FRAME_SIZE /* trap if r1 is in userspace */ + EMIT_BUG_ENTRY 100b,__FILE__,__LINE__,0 + .endif + + std r9,_CCR(r1) /* save CR in stackframe */ + std r11,_NIP(r1) /* save SRR0 in stackframe */ + std r12,_MSR(r1) /* save SRR1 in stackframe */ + std r10,0(r1) /* make stack chain pointer */ + std r0,GPR0(r1) /* save r0 in stackframe */ + std r10,GPR1(r1) /* save r1 in stackframe */ + + /* Mark our [H]SRRs valid for return */ + li r10,1 + .if IHSRR_IF_HVMODE + BEGIN_FTR_SECTION + stb r10,PACAHSRR_VALID(r13) + FTR_SECTION_ELSE + stb r10,PACASRR_VALID(r13) + ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) + .elseif IHSRR + stb r10,PACAHSRR_VALID(r13) + .else + stb r10,PACASRR_VALID(r13) + .endif + + .if ISTACK + .if IKUAP + kuap_save_amr_and_lock r9, r10, cr1, cr0 + .endif + beq 101f /* if from kernel mode */ +BEGIN_FTR_SECTION + ld r9,IAREA+EX_PPR(r13) /* Read PPR from paca */ + std r9,_PPR(r1) +END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) +101: + .else + .if IKUAP + kuap_save_amr_and_lock r9, r10, cr1 + .endif + .endif + + /* Save original regs values from save area to stack frame. */ + ld r9,IAREA+EX_R9(r13) /* move r9, r10 to stackframe */ + ld r10,IAREA+EX_R10(r13) + std r9,GPR9(r1) + std r10,GPR10(r1) + ld r9,IAREA+EX_R11(r13) /* move r11 - r13 to stackframe */ + ld r10,IAREA+EX_R12(r13) + ld r11,IAREA+EX_R13(r13) + std r9,GPR11(r1) + std r10,GPR12(r1) + std r11,GPR13(r1) + + SAVE_NVGPRS(r1) + + .if IDAR + .if IISIDE + ld r10,_NIP(r1) + .else + ld r10,IAREA+EX_DAR(r13) + .endif + std r10,_DAR(r1) + .endif + + .if IDSISR + .if IISIDE + ld r10,_MSR(r1) + lis r11,DSISR_SRR1_MATCH_64S@h + and r10,r10,r11 + .else + lwz r10,IAREA+EX_DSISR(r13) + .endif + std r10,_DSISR(r1) + .endif + +BEGIN_FTR_SECTION + .if ICFAR || ICFAR_IF_HVMODE + ld r10,IAREA+EX_CFAR(r13) + .else + li r10,0 + .endif + std r10,ORIG_GPR3(r1) +END_FTR_SECTION_IFSET(CPU_FTR_CFAR) + ld r10,IAREA+EX_CTR(r13) + std r10,_CTR(r1) + std r2,GPR2(r1) /* save r2 in stackframe */ + SAVE_GPRS(3, 8, r1) /* save r3 - r8 in stackframe */ + mflr r9 /* Get LR, later save to stack */ + LOAD_PACA_TOC() /* get kernel TOC into r2 */ + std r9,_LINK(r1) + lbz r10,PACAIRQSOFTMASK(r13) + mfspr r11,SPRN_XER /* save XER in stackframe */ + std r10,SOFTE(r1) + std r11,_XER(r1) + li r9,IVEC + std r9,_TRAP(r1) /* set trap number */ + li r10,0 + LOAD_REG_IMMEDIATE(r11, STACK_FRAME_REGS_MARKER) + std r10,RESULT(r1) /* clear regs->result */ + std r11,STACK_FRAME_OVERHEAD-16(r1) /* mark the frame */ +.endm + +/* + * On entry r13 points to the paca, r9-r13 are saved in the paca, + * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and + * SRR1, and relocation is on. + * + * If stack=0, then the stack is already set in r1, and r1 is saved in r10. + * PPR save and CPU accounting is not done for the !stack case (XXX why not?) + */ +.macro GEN_COMMON name + __GEN_COMMON_ENTRY \name + __GEN_COMMON_BODY \name +.endm + +.macro SEARCH_RESTART_TABLE +#ifdef CONFIG_RELOCATABLE + mr r12,r2 + LOAD_PACA_TOC() + LOAD_REG_ADDR(r9, __start___restart_table) + LOAD_REG_ADDR(r10, __stop___restart_table) + mr r2,r12 +#else + LOAD_REG_IMMEDIATE_SYM(r9, r12, __start___restart_table) + LOAD_REG_IMMEDIATE_SYM(r10, r12, __stop___restart_table) +#endif +300: + cmpd r9,r10 + beq 302f + ld r12,0(r9) + cmpld r11,r12 + blt 301f + ld r12,8(r9) + cmpld r11,r12 + bge 301f + ld r12,16(r9) + b 303f +301: + addi r9,r9,24 + b 300b +302: + li r12,0 +303: +.endm + +.macro SEARCH_SOFT_MASK_TABLE +#ifdef CONFIG_RELOCATABLE + mr r12,r2 + LOAD_PACA_TOC() + LOAD_REG_ADDR(r9, __start___soft_mask_table) + LOAD_REG_ADDR(r10, __stop___soft_mask_table) + mr r2,r12 +#else + LOAD_REG_IMMEDIATE_SYM(r9, r12, __start___soft_mask_table) + LOAD_REG_IMMEDIATE_SYM(r10, r12, __stop___soft_mask_table) +#endif +300: + cmpd r9,r10 + beq 302f + ld r12,0(r9) + cmpld r11,r12 + blt 301f + ld r12,8(r9) + cmpld r11,r12 + bge 301f + li r12,1 + b 303f +301: + addi r9,r9,16 + b 300b +302: + li r12,0 +303: +.endm + +/* + * Restore all registers including H/SRR0/1 saved in a stack frame of a + * standard exception. + */ +.macro EXCEPTION_RESTORE_REGS hsrr=0 + /* Move original SRR0 and SRR1 into the respective regs */ + ld r9,_MSR(r1) + li r10,0 + .if \hsrr + mtspr SPRN_HSRR1,r9 + stb r10,PACAHSRR_VALID(r13) + .else + mtspr SPRN_SRR1,r9 + stb r10,PACASRR_VALID(r13) + .endif + ld r9,_NIP(r1) + .if \hsrr + mtspr SPRN_HSRR0,r9 + .else + mtspr SPRN_SRR0,r9 + .endif + ld r9,_CTR(r1) + mtctr r9 + ld r9,_XER(r1) + mtxer r9 + ld r9,_LINK(r1) + mtlr r9 + ld r9,_CCR(r1) + mtcr r9 + REST_GPRS(2, 13, r1) + REST_GPR(0, r1) + /* restore original r1. */ + ld r1,GPR1(r1) +.endm + +/* + * EARLY_BOOT_FIXUP - Fix real-mode interrupt with wrong endian in early boot. + * + * There's a short window during boot where although the kernel is running + * little endian, any exceptions will cause the CPU to switch back to big + * endian. For example a WARN() boils down to a trap instruction, which will + * cause a program check, and we end up here but with the CPU in big endian + * mode. The first instruction of the program check handler (in GEN_INT_ENTRY + * below) is an mtsprg, which when executed in the wrong endian is an lhzu with + * a ~3GB displacement from r3. The content of r3 is random, so that is a load + * from some random location, and depending on the system can easily lead to a + * checkstop, or an infinitely recursive page fault. + * + * So to handle that case we have a trampoline here that can detect we are in + * the wrong endian and flip us back to the correct endian. We can't flip + * MSR[LE] using mtmsr, so we have to use rfid. That requires backing up SRR0/1 + * as well as a GPR. To do that we use SPRG0/2/3, as SPRG1 is already used for + * the paca. SPRG3 is user readable, but this trampoline is only active very + * early in boot, and SPRG3 will be reinitialised in vdso_getcpu_init() before + * userspace starts. + */ +.macro EARLY_BOOT_FIXUP +BEGIN_FTR_SECTION +#ifdef CONFIG_CPU_LITTLE_ENDIAN + tdi 0,0,0x48 // Trap never, or in reverse endian: b . + 8 + b 2f // Skip trampoline if endian is correct + .long 0xa643707d // mtsprg 0, r11 Backup r11 + .long 0xa6027a7d // mfsrr0 r11 + .long 0xa643727d // mtsprg 2, r11 Backup SRR0 in SPRG2 + .long 0xa6027b7d // mfsrr1 r11 + .long 0xa643737d // mtsprg 3, r11 Backup SRR1 in SPRG3 + .long 0xa600607d // mfmsr r11 + .long 0x01006b69 // xori r11, r11, 1 Invert MSR[LE] + .long 0xa6037b7d // mtsrr1 r11 + /* + * This is 'li r11,1f' where 1f is the absolute address of that + * label, byteswapped into the SI field of the instruction. + */ + .long 0x00006039 | \ + ((ABS_ADDR(1f, real_vectors) & 0x00ff) << 24) | \ + ((ABS_ADDR(1f, real_vectors) & 0xff00) << 8) + .long 0xa6037a7d // mtsrr0 r11 + .long 0x2400004c // rfid +1: + mfsprg r11, 3 + mtsrr1 r11 // Restore SRR1 + mfsprg r11, 2 + mtsrr0 r11 // Restore SRR0 + mfsprg r11, 0 // Restore r11 +2: +#endif + /* + * program check could hit at any time, and pseries can not block + * MSR[ME] in early boot. So check if there is anything useful in r13 + * yet, and spin forever if not. + */ + mtsprg 0, r11 + mfcr r11 + cmpdi r13, 0 + beq . + mtcr r11 + mfsprg r11, 0 +END_FTR_SECTION(0, 1) // nop out after boot +.endm + +/* + * There are a few constraints to be concerned with. + * - Real mode exceptions code/data must be located at their physical location. + * - Virtual mode exceptions must be mapped at their 0xc000... location. + * - Fixed location code must not call directly beyond the __end_interrupts + * area when built with CONFIG_RELOCATABLE. LOAD_HANDLER / bctr sequence + * must be used. + * - LOAD_HANDLER targets must be within first 64K of physical 0 / + * virtual 0xc00... + * - Conditional branch targets must be within +/-32K of caller. + * + * "Virtual exceptions" run with relocation on (MSR_IR=1, MSR_DR=1), and + * therefore don't have to run in physically located code or rfid to + * virtual mode kernel code. However on relocatable kernels they do have + * to branch to KERNELBASE offset because the rest of the kernel (outside + * the exception vectors) may be located elsewhere. + * + * Virtual exceptions correspond with physical, except their entry points + * are offset by 0xc000000000000000 and also tend to get an added 0x4000 + * offset applied. Virtual exceptions are enabled with the Alternate + * Interrupt Location (AIL) bit set in the LPCR. However this does not + * guarantee they will be delivered virtually. Some conditions (see the ISA) + * cause exceptions to be delivered in real mode. + * + * The scv instructions are a special case. They get a 0x3000 offset applied. + * scv exceptions have unique reentrancy properties, see below. + * + * It's impossible to receive interrupts below 0x300 via AIL. + * + * KVM: None of the virtual exceptions are from the guest. Anything that + * escalated to HV=1 from HV=0 is delivered via real mode handlers. + * + * + * We layout physical memory as follows: + * 0x0000 - 0x00ff : Secondary processor spin code + * 0x0100 - 0x18ff : Real mode pSeries interrupt vectors + * 0x1900 - 0x2fff : Real mode trampolines + * 0x3000 - 0x58ff : Relon (IR=1,DR=1) mode pSeries interrupt vectors + * 0x5900 - 0x6fff : Relon mode trampolines + * 0x7000 - 0x7fff : FWNMI data area + * 0x8000 - .... : Common interrupt handlers, remaining early + * setup code, rest of kernel. + * + * We could reclaim 0x4000-0x42ff for real mode trampolines if the space + * is necessary. Until then it's more consistent to explicitly put VIRT_NONE + * vectors there. + */ +OPEN_FIXED_SECTION(real_vectors, 0x0100, 0x1900) +OPEN_FIXED_SECTION(real_trampolines, 0x1900, 0x3000) +OPEN_FIXED_SECTION(virt_vectors, 0x3000, 0x5900) +OPEN_FIXED_SECTION(virt_trampolines, 0x5900, 0x7000) + +#ifdef CONFIG_PPC_POWERNV + .globl start_real_trampolines + .globl end_real_trampolines + .globl start_virt_trampolines + .globl end_virt_trampolines +#endif + +#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) +/* + * Data area reserved for FWNMI option. + * This address (0x7000) is fixed by the RPA. + * pseries and powernv need to keep the whole page from + * 0x7000 to 0x8000 free for use by the firmware + */ +ZERO_FIXED_SECTION(fwnmi_page, 0x7000, 0x8000) +OPEN_TEXT_SECTION(0x8000) +#else +OPEN_TEXT_SECTION(0x7000) +#endif + +USE_FIXED_SECTION(real_vectors) + +/* + * This is the start of the interrupt handlers for pSeries + * This code runs with relocation off. + * Code from here to __end_interrupts gets copied down to real + * address 0x100 when we are running a relocatable kernel. + * Therefore any relative branches in this section must only + * branch to labels in this section. + */ + .globl __start_interrupts +__start_interrupts: + +/** + * Interrupt 0x3000 - System Call Vectored Interrupt (syscall). + * This is a synchronous interrupt invoked with the "scv" instruction. The + * system call does not alter the HV bit, so it is directed to the OS. + * + * Handling: + * scv instructions enter the kernel without changing EE, RI, ME, or HV. + * In particular, this means we can take a maskable interrupt at any point + * in the scv handler, which is unlike any other interrupt. This is solved + * by treating the instruction addresses in the handler as being soft-masked, + * by adding a SOFT_MASK_TABLE entry for them. + * + * AIL-0 mode scv exceptions go to 0x17000-0x17fff, but we set AIL-3 and + * ensure scv is never executed with relocation off, which means AIL-0 + * should never happen. + * + * Before leaving the following inside-__end_soft_masked text, at least of the + * following must be true: + * - MSR[PR]=1 (i.e., return to userspace) + * - MSR_EE|MSR_RI is clear (no reentrant exceptions) + * - Standard kernel environment is set up (stack, paca, etc) + * + * KVM: + * These interrupts do not elevate HV 0->1, so HV is not involved. PR KVM + * ensures that FSCR[SCV] is disabled whenever it has to force AIL off. + * + * Call convention: + * + * syscall register convention is in Documentation/powerpc/syscall64-abi.rst + */ +EXC_VIRT_BEGIN(system_call_vectored, 0x3000, 0x1000) + /* SCV 0 */ + mr r9,r13 + GET_PACA(r13) + mflr r11 + mfctr r12 + li r10,IRQS_ALL_DISABLED + stb r10,PACAIRQSOFTMASK(r13) +#ifdef CONFIG_RELOCATABLE + b system_call_vectored_tramp +#else + b system_call_vectored_common +#endif + nop + + /* SCV 1 - 127 */ + .rept 127 + mr r9,r13 + GET_PACA(r13) + mflr r11 + mfctr r12 + li r10,IRQS_ALL_DISABLED + stb r10,PACAIRQSOFTMASK(r13) + li r0,-1 /* cause failure */ +#ifdef CONFIG_RELOCATABLE + b system_call_vectored_sigill_tramp +#else + b system_call_vectored_sigill +#endif + .endr +EXC_VIRT_END(system_call_vectored, 0x3000, 0x1000) + +// Treat scv vectors as soft-masked, see comment above. +// Use absolute values rather than labels here, so they don't get relocated, +// because this code runs unrelocated. +SOFT_MASK_TABLE(0xc000000000003000, 0xc000000000004000) + +#ifdef CONFIG_RELOCATABLE +TRAMP_VIRT_BEGIN(system_call_vectored_tramp) + __LOAD_HANDLER(r10, system_call_vectored_common, virt_trampolines) + mtctr r10 + bctr + +TRAMP_VIRT_BEGIN(system_call_vectored_sigill_tramp) + __LOAD_HANDLER(r10, system_call_vectored_sigill, virt_trampolines) + mtctr r10 + bctr +#endif + + +/* No virt vectors corresponding with 0x0..0x100 */ +EXC_VIRT_NONE(0x4000, 0x100) + + +/** + * Interrupt 0x100 - System Reset Interrupt (SRESET aka NMI). + * This is a non-maskable, asynchronous interrupt always taken in real-mode. + * It is caused by: + * - Wake from power-saving state, on powernv. + * - An NMI from another CPU, triggered by firmware or hypercall. + * - As crash/debug signal injected from BMC, firmware or hypervisor. + * + * Handling: + * Power-save wakeup is the only performance critical path, so this is + * determined quickly as possible first. In this case volatile registers + * can be discarded and SPRs like CFAR don't need to be read. + * + * If not a powersave wakeup, then it's run as a regular interrupt, however + * it uses its own stack and PACA save area to preserve the regular kernel + * environment for debugging. + * + * This interrupt is not maskable, so triggering it when MSR[RI] is clear, + * or SCRATCH0 is in use, etc. may cause a crash. It's also not entirely + * correct to switch to virtual mode to run the regular interrupt handler + * because it might be interrupted when the MMU is in a bad state (e.g., SLB + * is clear). + * + * FWNMI: + * PAPR specifies a "fwnmi" facility which sends the sreset to a different + * entry point with a different register set up. Some hypervisors will + * send the sreset to 0x100 in the guest if it is not fwnmi capable. + * + * KVM: + * Unlike most SRR interrupts, this may be taken by the host while executing + * in a guest, so a KVM test is required. KVM will pull the CPU out of guest + * mode and then raise the sreset. + */ +INT_DEFINE_BEGIN(system_reset) + IVEC=0x100 + IAREA=PACA_EXNMI + IVIRT=0 /* no virt entry point */ + ISTACK=0 + IKVM_REAL=1 +INT_DEFINE_END(system_reset) + +EXC_REAL_BEGIN(system_reset, 0x100, 0x100) +#ifdef CONFIG_PPC_P7_NAP + /* + * If running native on arch 2.06 or later, check if we are waking up + * from nap/sleep/winkle, and branch to idle handler. This tests SRR1 + * bits 46:47. A non-0 value indicates that we are coming from a power + * saving state. The idle wakeup handler initially runs in real mode, + * but we branch to the 0xc000... address so we can turn on relocation + * with mtmsrd later, after SPRs are restored. + * + * Careful to minimise cost for the fast path (idle wakeup) while + * also avoiding clobbering CFAR for the debug path (non-idle). + * + * For the idle wake case volatile registers can be clobbered, which + * is why we use those initially. If it turns out to not be an idle + * wake, carefully put everything back the way it was, so we can use + * common exception macros to handle it. + */ +BEGIN_FTR_SECTION + SET_SCRATCH0(r13) + GET_PACA(r13) + std r3,PACA_EXNMI+0*8(r13) + std r4,PACA_EXNMI+1*8(r13) + std r5,PACA_EXNMI+2*8(r13) + mfspr r3,SPRN_SRR1 + mfocrf r4,0x80 + rlwinm. r5,r3,47-31,30,31 + bne+ system_reset_idle_wake + /* Not powersave wakeup. Restore regs for regular interrupt handler. */ + mtocrf 0x80,r4 + ld r3,PACA_EXNMI+0*8(r13) + ld r4,PACA_EXNMI+1*8(r13) + ld r5,PACA_EXNMI+2*8(r13) + GET_SCRATCH0(r13) +END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) +#endif + + GEN_INT_ENTRY system_reset, virt=0 + /* + * In theory, we should not enable relocation here if it was disabled + * in SRR1, because the MMU may not be configured to support it (e.g., + * SLB may have been cleared). In practice, there should only be a few + * small windows where that's the case, and sreset is considered to + * be dangerous anyway. + */ +EXC_REAL_END(system_reset, 0x100, 0x100) +EXC_VIRT_NONE(0x4100, 0x100) + +#ifdef CONFIG_PPC_P7_NAP +TRAMP_REAL_BEGIN(system_reset_idle_wake) + /* We are waking up from idle, so may clobber any volatile register */ + cmpwi cr1,r5,2 + bltlr cr1 /* no state loss, return to idle caller with r3=SRR1 */ + __LOAD_FAR_HANDLER(r12, DOTSYM(idle_return_gpr_loss), real_trampolines) + mtctr r12 + bctr +#endif + +#ifdef CONFIG_PPC_PSERIES +/* + * Vectors for the FWNMI option. Share common code. + */ +TRAMP_REAL_BEGIN(system_reset_fwnmi) + GEN_INT_ENTRY system_reset, virt=0 + +#endif /* CONFIG_PPC_PSERIES */ + +EXC_COMMON_BEGIN(system_reset_common) + __GEN_COMMON_ENTRY system_reset + /* + * Increment paca->in_nmi. When the interrupt entry wrapper later + * enable MSR_RI, then SLB or MCE will be able to recover, but a nested + * NMI will notice in_nmi and not recover because of the use of the NMI + * stack. in_nmi reentrancy is tested in system_reset_exception. + */ + lhz r10,PACA_IN_NMI(r13) + addi r10,r10,1 + sth r10,PACA_IN_NMI(r13) + + mr r10,r1 + ld r1,PACA_NMI_EMERG_SP(r13) + subi r1,r1,INT_FRAME_SIZE + __GEN_COMMON_BODY system_reset + + addi r3,r1,STACK_FRAME_OVERHEAD + bl system_reset_exception + + /* Clear MSR_RI before setting SRR0 and SRR1. */ + li r9,0 + mtmsrd r9,1 + + /* + * MSR_RI is clear, now we can decrement paca->in_nmi. + */ + lhz r10,PACA_IN_NMI(r13) + subi r10,r10,1 + sth r10,PACA_IN_NMI(r13) + + kuap_kernel_restore r9, r10 + EXCEPTION_RESTORE_REGS + RFI_TO_USER_OR_KERNEL + + +/** + * Interrupt 0x200 - Machine Check Interrupt (MCE). + * This is a non-maskable interrupt always taken in real-mode. It can be + * synchronous or asynchronous, caused by hardware or software, and it may be + * taken in a power-saving state. + * + * Handling: + * Similarly to system reset, this uses its own stack and PACA save area, + * the difference is re-entrancy is allowed on the machine check stack. + * + * machine_check_early is run in real mode, and carefully decodes the + * machine check and tries to handle it (e.g., flush the SLB if there was an + * error detected there), determines if it was recoverable and logs the + * event. + * + * This early code does not "reconcile" irq soft-mask state like SRESET or + * regular interrupts do, so irqs_disabled() among other things may not work + * properly (irq disable/enable already doesn't work because irq tracing can + * not work in real mode). + * + * Then, depending on the execution context when the interrupt is taken, there + * are 3 main actions: + * - Executing in kernel mode. The event is queued with irq_work, which means + * it is handled when it is next safe to do so (i.e., the kernel has enabled + * interrupts), which could be immediately when the interrupt returns. This + * avoids nasty issues like switching to virtual mode when the MMU is in a + * bad state, or when executing OPAL code. (SRESET is exposed to such issues, + * but it has different priorities). Check to see if the CPU was in power + * save, and return via the wake up code if it was. + * + * - Executing in user mode. machine_check_exception is run like a normal + * interrupt handler, which processes the data generated by the early handler. + * + * - Executing in guest mode. The interrupt is run with its KVM test, and + * branches to KVM to deal with. KVM may queue the event for the host + * to report later. + * + * This interrupt is not maskable, so if it triggers when MSR[RI] is clear, + * or SCRATCH0 is in use, it may cause a crash. + * + * KVM: + * See SRESET. + */ +INT_DEFINE_BEGIN(machine_check_early) + IVEC=0x200 + IAREA=PACA_EXMC + IVIRT=0 /* no virt entry point */ + IREALMODE_COMMON=1 + ISTACK=0 + IDAR=1 + IDSISR=1 + IKUAP=0 /* We don't touch AMR here, we never go to virtual mode */ +INT_DEFINE_END(machine_check_early) + +INT_DEFINE_BEGIN(machine_check) + IVEC=0x200 + IAREA=PACA_EXMC + IVIRT=0 /* no virt entry point */ + IDAR=1 + IDSISR=1 + IKVM_REAL=1 +INT_DEFINE_END(machine_check) + +EXC_REAL_BEGIN(machine_check, 0x200, 0x100) + EARLY_BOOT_FIXUP + GEN_INT_ENTRY machine_check_early, virt=0 +EXC_REAL_END(machine_check, 0x200, 0x100) +EXC_VIRT_NONE(0x4200, 0x100) + +#ifdef CONFIG_PPC_PSERIES +TRAMP_REAL_BEGIN(machine_check_fwnmi) + /* See comment at machine_check exception, don't turn on RI */ + GEN_INT_ENTRY machine_check_early, virt=0 +#endif + +#define MACHINE_CHECK_HANDLER_WINDUP \ + /* Clear MSR_RI before setting SRR0 and SRR1. */\ + li r9,0; \ + mtmsrd r9,1; /* Clear MSR_RI */ \ + /* Decrement paca->in_mce now RI is clear. */ \ + lhz r12,PACA_IN_MCE(r13); \ + subi r12,r12,1; \ + sth r12,PACA_IN_MCE(r13); \ + EXCEPTION_RESTORE_REGS + +EXC_COMMON_BEGIN(machine_check_early_common) + __GEN_REALMODE_COMMON_ENTRY machine_check_early + + /* + * Switch to mc_emergency stack and handle re-entrancy (we limit + * the nested MCE upto level 4 to avoid stack overflow). + * Save MCE registers srr1, srr0, dar and dsisr and then set ME=1 + * + * We use paca->in_mce to check whether this is the first entry or + * nested machine check. We increment paca->in_mce to track nested + * machine checks. + * + * If this is the first entry then set stack pointer to + * paca->mc_emergency_sp, otherwise r1 is already pointing to + * stack frame on mc_emergency stack. + * + * NOTE: We are here with MSR_ME=0 (off), which means we risk a + * checkstop if we get another machine check exception before we do + * rfid with MSR_ME=1. + * + * This interrupt can wake directly from idle. If that is the case, + * the machine check is handled then the idle wakeup code is called + * to restore state. + */ + lhz r10,PACA_IN_MCE(r13) + cmpwi r10,0 /* Are we in nested machine check */ + cmpwi cr1,r10,MAX_MCE_DEPTH /* Are we at maximum nesting */ + addi r10,r10,1 /* increment paca->in_mce */ + sth r10,PACA_IN_MCE(r13) + + mr r10,r1 /* Save r1 */ + bne 1f + /* First machine check entry */ + ld r1,PACAMCEMERGSP(r13) /* Use MC emergency stack */ +1: /* Limit nested MCE to level 4 to avoid stack overflow */ + bgt cr1,unrecoverable_mce /* Check if we hit limit of 4 */ + subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ + + __GEN_COMMON_BODY machine_check_early + +BEGIN_FTR_SECTION + bl enable_machine_check +END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) + addi r3,r1,STACK_FRAME_OVERHEAD +BEGIN_FTR_SECTION + bl machine_check_early_boot +END_FTR_SECTION(0, 1) // nop out after boot + bl machine_check_early + std r3,RESULT(r1) /* Save result */ + ld r12,_MSR(r1) + +#ifdef CONFIG_PPC_P7_NAP + /* + * Check if thread was in power saving mode. We come here when any + * of the following is true: + * a. thread wasn't in power saving mode + * b. thread was in power saving mode with no state loss, + * supervisor state loss or hypervisor state loss. + * + * Go back to nap/sleep/winkle mode again if (b) is true. + */ +BEGIN_FTR_SECTION + rlwinm. r11,r12,47-31,30,31 + bne machine_check_idle_common +END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) +#endif + +#ifdef CONFIG_KVM_BOOK3S_64_HANDLER + /* + * Check if we are coming from guest. If yes, then run the normal + * exception handler which will take the + * machine_check_kvm->kvm_interrupt branch to deliver the MC event + * to guest. + */ + lbz r11,HSTATE_IN_GUEST(r13) + cmpwi r11,0 /* Check if coming from guest */ + bne mce_deliver /* continue if we are. */ +#endif + + /* + * Check if we are coming from userspace. If yes, then run the normal + * exception handler which will deliver the MC event to this kernel. + */ + andi. r11,r12,MSR_PR /* See if coming from user. */ + bne mce_deliver /* continue in V mode if we are. */ + + /* + * At this point we are coming from kernel context. + * Queue up the MCE event and return from the interrupt. + * But before that, check if this is an un-recoverable exception. + * If yes, then stay on emergency stack and panic. + */ + andi. r11,r12,MSR_RI + beq unrecoverable_mce + + /* + * Check if we have successfully handled/recovered from error, if not + * then stay on emergency stack and panic. + */ + ld r3,RESULT(r1) /* Load result */ + cmpdi r3,0 /* see if we handled MCE successfully */ + beq unrecoverable_mce /* if !handled then panic */ + + /* + * Return from MC interrupt. + * Queue up the MCE event so that we can log it later, while + * returning from kernel or opal call. + */ + bl machine_check_queue_event + MACHINE_CHECK_HANDLER_WINDUP + RFI_TO_KERNEL + +mce_deliver: + /* + * This is a host user or guest MCE. Restore all registers, then + * run the "late" handler. For host user, this will run the + * machine_check_exception handler in virtual mode like a normal + * interrupt handler. For guest, this will trigger the KVM test + * and branch to the KVM interrupt similarly to other interrupts. + */ +BEGIN_FTR_SECTION + ld r10,ORIG_GPR3(r1) + mtspr SPRN_CFAR,r10 +END_FTR_SECTION_IFSET(CPU_FTR_CFAR) + MACHINE_CHECK_HANDLER_WINDUP + GEN_INT_ENTRY machine_check, virt=0 + +EXC_COMMON_BEGIN(machine_check_common) + /* + * Machine check is different because we use a different + * save area: PACA_EXMC instead of PACA_EXGEN. + */ + GEN_COMMON machine_check + addi r3,r1,STACK_FRAME_OVERHEAD + bl machine_check_exception_async + b interrupt_return_srr + + +#ifdef CONFIG_PPC_P7_NAP +/* + * This is an idle wakeup. Low level machine check has already been + * done. Queue the event then call the idle code to do the wake up. + */ +EXC_COMMON_BEGIN(machine_check_idle_common) + bl machine_check_queue_event + + /* + * GPR-loss wakeups are relatively straightforward, because the + * idle sleep code has saved all non-volatile registers on its + * own stack, and r1 in PACAR1. + * + * For no-loss wakeups the r1 and lr registers used by the + * early machine check handler have to be restored first. r2 is + * the kernel TOC, so no need to restore it. + * + * Then decrement MCE nesting after finishing with the stack. + */ + ld r3,_MSR(r1) + ld r4,_LINK(r1) + ld r1,GPR1(r1) + + lhz r11,PACA_IN_MCE(r13) + subi r11,r11,1 + sth r11,PACA_IN_MCE(r13) + + mtlr r4 + rlwinm r10,r3,47-31,30,31 + cmpwi cr1,r10,2 + bltlr cr1 /* no state loss, return to idle caller with r3=SRR1 */ + b idle_return_gpr_loss +#endif + +EXC_COMMON_BEGIN(unrecoverable_mce) + /* + * We are going down. But there are chances that we might get hit by + * another MCE during panic path and we may run into unstable state + * with no way out. Hence, turn ME bit off while going down, so that + * when another MCE is hit during panic path, system will checkstop + * and hypervisor will get restarted cleanly by SP. + */ +BEGIN_FTR_SECTION + li r10,0 /* clear MSR_RI */ + mtmsrd r10,1 + bl disable_machine_check +END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) + ld r10,PACAKMSR(r13) + li r3,MSR_ME + andc r10,r10,r3 + mtmsrd r10 + + lhz r12,PACA_IN_MCE(r13) + subi r12,r12,1 + sth r12,PACA_IN_MCE(r13) + + /* + * Invoke machine_check_exception to print MCE event and panic. + * This is the NMI version of the handler because we are called from + * the early handler which is a true NMI. + */ + addi r3,r1,STACK_FRAME_OVERHEAD + bl machine_check_exception + + /* + * We will not reach here. Even if we did, there is no way out. + * Call unrecoverable_exception and die. + */ + addi r3,r1,STACK_FRAME_OVERHEAD + bl unrecoverable_exception + b . + + +/** + * Interrupt 0x300 - Data Storage Interrupt (DSI). + * This is a synchronous interrupt generated due to a data access exception, + * e.g., a load orstore which does not have a valid page table entry with + * permissions. DAWR matches also fault here, as do RC updates, and minor misc + * errors e.g., copy/paste, AMO, certain invalid CI accesses, etc. + * + * Handling: + * - Hash MMU + * Go to do_hash_fault, which attempts to fill the HPT from an entry in the + * Linux page table. Hash faults can hit in kernel mode in a fairly + * arbitrary state (e.g., interrupts disabled, locks held) when accessing + * "non-bolted" regions, e.g., vmalloc space. However these should always be + * backed by Linux page table entries. + * + * If no entry is found the Linux page fault handler is invoked (by + * do_hash_fault). Linux page faults can happen in kernel mode due to user + * copy operations of course. + * + * KVM: The KVM HDSI handler may perform a load with MSR[DR]=1 in guest + * MMU context, which may cause a DSI in the host, which must go to the + * KVM handler. MSR[IR] is not enabled, so the real-mode handler will + * always be used regardless of AIL setting. + * + * - Radix MMU + * The hardware loads from the Linux page table directly, so a fault goes + * immediately to Linux page fault. + * + * Conditions like DAWR match are handled on the way in to Linux page fault. + */ +INT_DEFINE_BEGIN(data_access) + IVEC=0x300 + IDAR=1 + IDSISR=1 + IKVM_REAL=1 +INT_DEFINE_END(data_access) + +EXC_REAL_BEGIN(data_access, 0x300, 0x80) + GEN_INT_ENTRY data_access, virt=0 +EXC_REAL_END(data_access, 0x300, 0x80) +EXC_VIRT_BEGIN(data_access, 0x4300, 0x80) + GEN_INT_ENTRY data_access, virt=1 +EXC_VIRT_END(data_access, 0x4300, 0x80) +EXC_COMMON_BEGIN(data_access_common) + GEN_COMMON data_access + ld r4,_DSISR(r1) + addi r3,r1,STACK_FRAME_OVERHEAD + andis. r0,r4,DSISR_DABRMATCH@h + bne- 1f +#ifdef CONFIG_PPC_64S_HASH_MMU +BEGIN_MMU_FTR_SECTION + bl do_hash_fault +MMU_FTR_SECTION_ELSE + bl do_page_fault +ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) +#else + bl do_page_fault +#endif + b interrupt_return_srr + +1: bl do_break + /* + * do_break() may have changed the NV GPRS while handling a breakpoint. + * If so, we need to restore them with their updated values. + */ + REST_NVGPRS(r1) + b interrupt_return_srr + + +/** + * Interrupt 0x380 - Data Segment Interrupt (DSLB). + * This is a synchronous interrupt in response to an MMU fault missing SLB + * entry for HPT, or an address outside RPT translation range. + * + * Handling: + * - HPT: + * This refills the SLB, or reports an access fault similarly to a bad page + * fault. When coming from user-mode, the SLB handler may access any kernel + * data, though it may itself take a DSLB. When coming from kernel mode, + * recursive faults must be avoided so access is restricted to the kernel + * image text/data, kernel stack, and any data allocated below + * ppc64_bolted_size (first segment). The kernel handler must avoid stomping + * on user-handler data structures. + * + * KVM: Same as 0x300, DSLB must test for KVM guest. + */ +INT_DEFINE_BEGIN(data_access_slb) + IVEC=0x380 + IDAR=1 + IKVM_REAL=1 +INT_DEFINE_END(data_access_slb) + +EXC_REAL_BEGIN(data_access_slb, 0x380, 0x80) + GEN_INT_ENTRY data_access_slb, virt=0 +EXC_REAL_END(data_access_slb, 0x380, 0x80) +EXC_VIRT_BEGIN(data_access_slb, 0x4380, 0x80) + GEN_INT_ENTRY data_access_slb, virt=1 +EXC_VIRT_END(data_access_slb, 0x4380, 0x80) +EXC_COMMON_BEGIN(data_access_slb_common) + GEN_COMMON data_access_slb +#ifdef CONFIG_PPC_64S_HASH_MMU +BEGIN_MMU_FTR_SECTION + /* HPT case, do SLB fault */ + addi r3,r1,STACK_FRAME_OVERHEAD + bl do_slb_fault + cmpdi r3,0 + bne- 1f + b fast_interrupt_return_srr +1: /* Error case */ +MMU_FTR_SECTION_ELSE + /* Radix case, access is outside page table range */ + li r3,-EFAULT +ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) +#else + li r3,-EFAULT +#endif + std r3,RESULT(r1) + addi r3,r1,STACK_FRAME_OVERHEAD + bl do_bad_segment_interrupt + b interrupt_return_srr + + +/** + * Interrupt 0x400 - Instruction Storage Interrupt (ISI). + * This is a synchronous interrupt in response to an MMU fault due to an + * instruction fetch. + * + * Handling: + * Similar to DSI, though in response to fetch. The faulting address is found + * in SRR0 (rather than DAR), and status in SRR1 (rather than DSISR). + */ +INT_DEFINE_BEGIN(instruction_access) + IVEC=0x400 + IISIDE=1 + IDAR=1 + IDSISR=1 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(instruction_access) + +EXC_REAL_BEGIN(instruction_access, 0x400, 0x80) + GEN_INT_ENTRY instruction_access, virt=0 +EXC_REAL_END(instruction_access, 0x400, 0x80) +EXC_VIRT_BEGIN(instruction_access, 0x4400, 0x80) + GEN_INT_ENTRY instruction_access, virt=1 +EXC_VIRT_END(instruction_access, 0x4400, 0x80) +EXC_COMMON_BEGIN(instruction_access_common) + GEN_COMMON instruction_access + addi r3,r1,STACK_FRAME_OVERHEAD +#ifdef CONFIG_PPC_64S_HASH_MMU +BEGIN_MMU_FTR_SECTION + bl do_hash_fault +MMU_FTR_SECTION_ELSE + bl do_page_fault +ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) +#else + bl do_page_fault +#endif + b interrupt_return_srr + + +/** + * Interrupt 0x480 - Instruction Segment Interrupt (ISLB). + * This is a synchronous interrupt in response to an MMU fault due to an + * instruction fetch. + * + * Handling: + * Similar to DSLB, though in response to fetch. The faulting address is found + * in SRR0 (rather than DAR). + */ +INT_DEFINE_BEGIN(instruction_access_slb) + IVEC=0x480 + IISIDE=1 + IDAR=1 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(instruction_access_slb) + +EXC_REAL_BEGIN(instruction_access_slb, 0x480, 0x80) + GEN_INT_ENTRY instruction_access_slb, virt=0 +EXC_REAL_END(instruction_access_slb, 0x480, 0x80) +EXC_VIRT_BEGIN(instruction_access_slb, 0x4480, 0x80) + GEN_INT_ENTRY instruction_access_slb, virt=1 +EXC_VIRT_END(instruction_access_slb, 0x4480, 0x80) +EXC_COMMON_BEGIN(instruction_access_slb_common) + GEN_COMMON instruction_access_slb +#ifdef CONFIG_PPC_64S_HASH_MMU +BEGIN_MMU_FTR_SECTION + /* HPT case, do SLB fault */ + addi r3,r1,STACK_FRAME_OVERHEAD + bl do_slb_fault + cmpdi r3,0 + bne- 1f + b fast_interrupt_return_srr +1: /* Error case */ +MMU_FTR_SECTION_ELSE + /* Radix case, access is outside page table range */ + li r3,-EFAULT +ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) +#else + li r3,-EFAULT +#endif + std r3,RESULT(r1) + addi r3,r1,STACK_FRAME_OVERHEAD + bl do_bad_segment_interrupt + b interrupt_return_srr + + +/** + * Interrupt 0x500 - External Interrupt. + * This is an asynchronous maskable interrupt in response to an "external + * exception" from the interrupt controller or hypervisor (e.g., device + * interrupt). It is maskable in hardware by clearing MSR[EE], and + * soft-maskable with IRQS_DISABLED mask (i.e., local_irq_disable()). + * + * When running in HV mode, Linux sets up the LPCR[LPES] bit such that + * interrupts are delivered with HSRR registers, guests use SRRs, which + * reqiures IHSRR_IF_HVMODE. + * + * On bare metal POWER9 and later, Linux sets the LPCR[HVICE] bit such that + * external interrupts are delivered as Hypervisor Virtualization Interrupts + * rather than External Interrupts. + * + * Handling: + * This calls into Linux IRQ handler. NVGPRs are not saved to reduce overhead, + * because registers at the time of the interrupt are not so important as it is + * asynchronous. + * + * If soft masked, the masked handler will note the pending interrupt for + * replay, and clear MSR[EE] in the interrupted context. + * + * CFAR is not required because this is an asynchronous interrupt that in + * general won't have much bearing on the state of the CPU, with the possible + * exception of crash/debug IPIs, but those are generally moving to use SRESET + * IPIs. Unless this is an HV interrupt and KVM HV is possible, in which case + * it may be exiting the guest and need CFAR to be saved. + */ +INT_DEFINE_BEGIN(hardware_interrupt) + IVEC=0x500 + IHSRR_IF_HVMODE=1 + IMASK=IRQS_DISABLED + IKVM_REAL=1 + IKVM_VIRT=1 + ICFAR=0 +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE + ICFAR_IF_HVMODE=1 +#endif +INT_DEFINE_END(hardware_interrupt) + +EXC_REAL_BEGIN(hardware_interrupt, 0x500, 0x100) + GEN_INT_ENTRY hardware_interrupt, virt=0 +EXC_REAL_END(hardware_interrupt, 0x500, 0x100) +EXC_VIRT_BEGIN(hardware_interrupt, 0x4500, 0x100) + GEN_INT_ENTRY hardware_interrupt, virt=1 +EXC_VIRT_END(hardware_interrupt, 0x4500, 0x100) +EXC_COMMON_BEGIN(hardware_interrupt_common) + GEN_COMMON hardware_interrupt + addi r3,r1,STACK_FRAME_OVERHEAD + bl do_IRQ + BEGIN_FTR_SECTION + b interrupt_return_hsrr + FTR_SECTION_ELSE + b interrupt_return_srr + ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) + + +/** + * Interrupt 0x600 - Alignment Interrupt + * This is a synchronous interrupt in response to data alignment fault. + */ +INT_DEFINE_BEGIN(alignment) + IVEC=0x600 + IDAR=1 + IDSISR=1 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(alignment) + +EXC_REAL_BEGIN(alignment, 0x600, 0x100) + GEN_INT_ENTRY alignment, virt=0 +EXC_REAL_END(alignment, 0x600, 0x100) +EXC_VIRT_BEGIN(alignment, 0x4600, 0x100) + GEN_INT_ENTRY alignment, virt=1 +EXC_VIRT_END(alignment, 0x4600, 0x100) +EXC_COMMON_BEGIN(alignment_common) + GEN_COMMON alignment + addi r3,r1,STACK_FRAME_OVERHEAD + bl alignment_exception + REST_NVGPRS(r1) /* instruction emulation may change GPRs */ + b interrupt_return_srr + + +/** + * Interrupt 0x700 - Program Interrupt (program check). + * This is a synchronous interrupt in response to various instruction faults: + * traps, privilege errors, TM errors, floating point exceptions. + * + * Handling: + * This interrupt may use the "emergency stack" in some cases when being taken + * from kernel context, which complicates handling. + */ +INT_DEFINE_BEGIN(program_check) + IVEC=0x700 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(program_check) + +EXC_REAL_BEGIN(program_check, 0x700, 0x100) + EARLY_BOOT_FIXUP + GEN_INT_ENTRY program_check, virt=0 +EXC_REAL_END(program_check, 0x700, 0x100) +EXC_VIRT_BEGIN(program_check, 0x4700, 0x100) + GEN_INT_ENTRY program_check, virt=1 +EXC_VIRT_END(program_check, 0x4700, 0x100) +EXC_COMMON_BEGIN(program_check_common) + __GEN_COMMON_ENTRY program_check + + /* + * It's possible to receive a TM Bad Thing type program check with + * userspace register values (in particular r1), but with SRR1 reporting + * that we came from the kernel. Normally that would confuse the bad + * stack logic, and we would report a bad kernel stack pointer. Instead + * we switch to the emergency stack if we're taking a TM Bad Thing from + * the kernel. + */ + + andi. r10,r12,MSR_PR + bne .Lnormal_stack /* If userspace, go normal path */ + + andis. r10,r12,(SRR1_PROGTM)@h + bne .Lemergency_stack /* If TM, emergency */ + + cmpdi r1,-INT_FRAME_SIZE /* check if r1 is in userspace */ + blt .Lnormal_stack /* normal path if not */ + + /* Use the emergency stack */ +.Lemergency_stack: + andi. r10,r12,MSR_PR /* Set CR0 correctly for label */ + /* 3 in EXCEPTION_PROLOG_COMMON */ + mr r10,r1 /* Save r1 */ + ld r1,PACAEMERGSP(r13) /* Use emergency stack */ + subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ + __ISTACK(program_check)=0 + __GEN_COMMON_BODY program_check + b .Ldo_program_check + +.Lnormal_stack: + __ISTACK(program_check)=1 + __GEN_COMMON_BODY program_check + +.Ldo_program_check: + addi r3,r1,STACK_FRAME_OVERHEAD + bl program_check_exception + REST_NVGPRS(r1) /* instruction emulation may change GPRs */ + b interrupt_return_srr + + +/* + * Interrupt 0x800 - Floating-Point Unavailable Interrupt. + * This is a synchronous interrupt in response to executing an fp instruction + * with MSR[FP]=0. + * + * Handling: + * This will load FP registers and enable the FP bit if coming from userspace, + * otherwise report a bad kernel use of FP. + */ +INT_DEFINE_BEGIN(fp_unavailable) + IVEC=0x800 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(fp_unavailable) + +EXC_REAL_BEGIN(fp_unavailable, 0x800, 0x100) + GEN_INT_ENTRY fp_unavailable, virt=0 +EXC_REAL_END(fp_unavailable, 0x800, 0x100) +EXC_VIRT_BEGIN(fp_unavailable, 0x4800, 0x100) + GEN_INT_ENTRY fp_unavailable, virt=1 +EXC_VIRT_END(fp_unavailable, 0x4800, 0x100) +EXC_COMMON_BEGIN(fp_unavailable_common) + GEN_COMMON fp_unavailable + bne 1f /* if from user, just load it up */ + addi r3,r1,STACK_FRAME_OVERHEAD + bl kernel_fp_unavailable_exception +0: trap + EMIT_BUG_ENTRY 0b, __FILE__, __LINE__, 0 +1: +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +BEGIN_FTR_SECTION + /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in + * transaction), go do TM stuff + */ + rldicl. r0, r12, (64-MSR_TS_LG), (64-2) + bne- 2f +END_FTR_SECTION_IFSET(CPU_FTR_TM) +#endif + bl load_up_fpu + b fast_interrupt_return_srr +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +2: /* User process was in a transaction */ + addi r3,r1,STACK_FRAME_OVERHEAD + bl fp_unavailable_tm + b interrupt_return_srr +#endif + + +/** + * Interrupt 0x900 - Decrementer Interrupt. + * This is an asynchronous interrupt in response to a decrementer exception + * (e.g., DEC has wrapped below zero). It is maskable in hardware by clearing + * MSR[EE], and soft-maskable with IRQS_DISABLED mask (i.e., + * local_irq_disable()). + * + * Handling: + * This calls into Linux timer handler. NVGPRs are not saved (see 0x500). + * + * If soft masked, the masked handler will note the pending interrupt for + * replay, and bump the decrementer to a high value, leaving MSR[EE] enabled + * in the interrupted context. + * If PPC_WATCHDOG is configured, the soft masked handler will actually set + * things back up to run soft_nmi_interrupt as a regular interrupt handler + * on the emergency stack. + * + * CFAR is not required because this is asynchronous (see hardware_interrupt). + * A watchdog interrupt may like to have CFAR, but usually the interesting + * branch is long gone by that point (e.g., infinite loop). + */ +INT_DEFINE_BEGIN(decrementer) + IVEC=0x900 + IMASK=IRQS_DISABLED +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif + ICFAR=0 +INT_DEFINE_END(decrementer) + +EXC_REAL_BEGIN(decrementer, 0x900, 0x80) + GEN_INT_ENTRY decrementer, virt=0 +EXC_REAL_END(decrementer, 0x900, 0x80) +EXC_VIRT_BEGIN(decrementer, 0x4900, 0x80) + GEN_INT_ENTRY decrementer, virt=1 +EXC_VIRT_END(decrementer, 0x4900, 0x80) +EXC_COMMON_BEGIN(decrementer_common) + GEN_COMMON decrementer + addi r3,r1,STACK_FRAME_OVERHEAD + bl timer_interrupt + b interrupt_return_srr + + +/** + * Interrupt 0x980 - Hypervisor Decrementer Interrupt. + * This is an asynchronous interrupt, similar to 0x900 but for the HDEC + * register. + * + * Handling: + * Linux does not use this outside KVM where it's used to keep a host timer + * while the guest is given control of DEC. It should normally be caught by + * the KVM test and routed there. + */ +INT_DEFINE_BEGIN(hdecrementer) + IVEC=0x980 + IHSRR=1 + ISTACK=0 + IKVM_REAL=1 + IKVM_VIRT=1 +INT_DEFINE_END(hdecrementer) + +EXC_REAL_BEGIN(hdecrementer, 0x980, 0x80) + GEN_INT_ENTRY hdecrementer, virt=0 +EXC_REAL_END(hdecrementer, 0x980, 0x80) +EXC_VIRT_BEGIN(hdecrementer, 0x4980, 0x80) + GEN_INT_ENTRY hdecrementer, virt=1 +EXC_VIRT_END(hdecrementer, 0x4980, 0x80) +EXC_COMMON_BEGIN(hdecrementer_common) + __GEN_COMMON_ENTRY hdecrementer + /* + * Hypervisor decrementer interrupts not caught by the KVM test + * shouldn't occur but are sometimes left pending on exit from a KVM + * guest. We don't need to do anything to clear them, as they are + * edge-triggered. + * + * Be careful to avoid touching the kernel stack. + */ + li r10,0 + stb r10,PACAHSRR_VALID(r13) + ld r10,PACA_EXGEN+EX_CTR(r13) + mtctr r10 + mtcrf 0x80,r9 + ld r9,PACA_EXGEN+EX_R9(r13) + ld r10,PACA_EXGEN+EX_R10(r13) + ld r11,PACA_EXGEN+EX_R11(r13) + ld r12,PACA_EXGEN+EX_R12(r13) + ld r13,PACA_EXGEN+EX_R13(r13) + HRFI_TO_KERNEL + + +/** + * Interrupt 0xa00 - Directed Privileged Doorbell Interrupt. + * This is an asynchronous interrupt in response to a msgsndp doorbell. + * It is maskable in hardware by clearing MSR[EE], and soft-maskable with + * IRQS_DISABLED mask (i.e., local_irq_disable()). + * + * Handling: + * Guests may use this for IPIs between threads in a core if the + * hypervisor supports it. NVGPRS are not saved (see 0x500). + * + * If soft masked, the masked handler will note the pending interrupt for + * replay, leaving MSR[EE] enabled in the interrupted context because the + * doorbells are edge triggered. + * + * CFAR is not required, similarly to hardware_interrupt. + */ +INT_DEFINE_BEGIN(doorbell_super) + IVEC=0xa00 + IMASK=IRQS_DISABLED +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif + ICFAR=0 +INT_DEFINE_END(doorbell_super) + +EXC_REAL_BEGIN(doorbell_super, 0xa00, 0x100) + GEN_INT_ENTRY doorbell_super, virt=0 +EXC_REAL_END(doorbell_super, 0xa00, 0x100) +EXC_VIRT_BEGIN(doorbell_super, 0x4a00, 0x100) + GEN_INT_ENTRY doorbell_super, virt=1 +EXC_VIRT_END(doorbell_super, 0x4a00, 0x100) +EXC_COMMON_BEGIN(doorbell_super_common) + GEN_COMMON doorbell_super + addi r3,r1,STACK_FRAME_OVERHEAD +#ifdef CONFIG_PPC_DOORBELL + bl doorbell_exception +#else + bl unknown_async_exception +#endif + b interrupt_return_srr + + +EXC_REAL_NONE(0xb00, 0x100) +EXC_VIRT_NONE(0x4b00, 0x100) + +/** + * Interrupt 0xc00 - System Call Interrupt (syscall, hcall). + * This is a synchronous interrupt invoked with the "sc" instruction. The + * system call is invoked with "sc 0" and does not alter the HV bit, so it + * is directed to the currently running OS. The hypercall is invoked with + * "sc 1" and it sets HV=1, so it elevates to hypervisor. + * + * In HPT, sc 1 always goes to 0xc00 real mode. In RADIX, sc 1 can go to + * 0x4c00 virtual mode. + * + * Handling: + * If the KVM test fires then it was due to a hypercall and is accordingly + * routed to KVM. Otherwise this executes a normal Linux system call. + * + * Call convention: + * + * syscall and hypercalls register conventions are documented in + * Documentation/powerpc/syscall64-abi.rst and + * Documentation/powerpc/papr_hcalls.rst respectively. + * + * The intersection of volatile registers that don't contain possible + * inputs is: cr0, xer, ctr. We may use these as scratch regs upon entry + * without saving, though xer is not a good idea to use, as hardware may + * interpret some bits so it may be costly to change them. + */ +INT_DEFINE_BEGIN(system_call) + IVEC=0xc00 + IKVM_REAL=1 + IKVM_VIRT=1 + ICFAR=0 +INT_DEFINE_END(system_call) + +.macro SYSTEM_CALL virt +#ifdef CONFIG_KVM_BOOK3S_64_HANDLER + /* + * There is a little bit of juggling to get syscall and hcall + * working well. Save r13 in ctr to avoid using SPRG scratch + * register. + * + * Userspace syscalls have already saved the PPR, hcalls must save + * it before setting HMT_MEDIUM. + */ + mtctr r13 + GET_PACA(r13) + std r10,PACA_EXGEN+EX_R10(r13) + INTERRUPT_TO_KERNEL + KVMTEST system_call kvm_hcall /* uses r10, branch to kvm_hcall */ + mfctr r9 +#else + mr r9,r13 + GET_PACA(r13) + INTERRUPT_TO_KERNEL +#endif + +#ifdef CONFIG_PPC_FAST_ENDIAN_SWITCH +BEGIN_FTR_SECTION + cmpdi r0,0x1ebe + beq- 1f +END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) +#endif + + /* We reach here with PACA in r13, r13 in r9. */ + mfspr r11,SPRN_SRR0 + mfspr r12,SPRN_SRR1 + + HMT_MEDIUM + + .if ! \virt + __LOAD_HANDLER(r10, system_call_common_real, real_vectors) + mtctr r10 + bctr + .else +#ifdef CONFIG_RELOCATABLE + __LOAD_HANDLER(r10, system_call_common, virt_vectors) + mtctr r10 + bctr +#else + b system_call_common +#endif + .endif + +#ifdef CONFIG_PPC_FAST_ENDIAN_SWITCH + /* Fast LE/BE switch system call */ +1: mfspr r12,SPRN_SRR1 + xori r12,r12,MSR_LE + mtspr SPRN_SRR1,r12 + mr r13,r9 + RFI_TO_USER /* return to userspace */ + b . /* prevent speculative execution */ +#endif +.endm + +EXC_REAL_BEGIN(system_call, 0xc00, 0x100) + SYSTEM_CALL 0 +EXC_REAL_END(system_call, 0xc00, 0x100) +EXC_VIRT_BEGIN(system_call, 0x4c00, 0x100) + SYSTEM_CALL 1 +EXC_VIRT_END(system_call, 0x4c00, 0x100) + +#ifdef CONFIG_KVM_BOOK3S_64_HANDLER +TRAMP_REAL_BEGIN(kvm_hcall) + std r9,PACA_EXGEN+EX_R9(r13) + std r11,PACA_EXGEN+EX_R11(r13) + std r12,PACA_EXGEN+EX_R12(r13) + mfcr r9 + mfctr r10 + std r10,PACA_EXGEN+EX_R13(r13) + li r10,0 + std r10,PACA_EXGEN+EX_CFAR(r13) + std r10,PACA_EXGEN+EX_CTR(r13) + /* + * Save the PPR (on systems that support it) before changing to + * HMT_MEDIUM. That allows the KVM code to save that value into the + * guest state (it is the guest's PPR value). + */ +BEGIN_FTR_SECTION + mfspr r10,SPRN_PPR + std r10,PACA_EXGEN+EX_PPR(r13) +END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) + + HMT_MEDIUM + +#ifdef CONFIG_RELOCATABLE + /* + * Requires __LOAD_FAR_HANDLER beause kvmppc_hcall lives + * outside the head section. + */ + __LOAD_FAR_HANDLER(r10, kvmppc_hcall, real_trampolines) + mtctr r10 + bctr +#else + b kvmppc_hcall +#endif +#endif + +/** + * Interrupt 0xd00 - Trace Interrupt. + * This is a synchronous interrupt in response to instruction step or + * breakpoint faults. + */ +INT_DEFINE_BEGIN(single_step) + IVEC=0xd00 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(single_step) + +EXC_REAL_BEGIN(single_step, 0xd00, 0x100) + GEN_INT_ENTRY single_step, virt=0 +EXC_REAL_END(single_step, 0xd00, 0x100) +EXC_VIRT_BEGIN(single_step, 0x4d00, 0x100) + GEN_INT_ENTRY single_step, virt=1 +EXC_VIRT_END(single_step, 0x4d00, 0x100) +EXC_COMMON_BEGIN(single_step_common) + GEN_COMMON single_step + addi r3,r1,STACK_FRAME_OVERHEAD + bl single_step_exception + b interrupt_return_srr + + +/** + * Interrupt 0xe00 - Hypervisor Data Storage Interrupt (HDSI). + * This is a synchronous interrupt in response to an MMU fault caused by a + * guest data access. + * + * Handling: + * This should always get routed to KVM. In radix MMU mode, this is caused + * by a guest nested radix access that can't be performed due to the + * partition scope page table. In hash mode, this can be caused by guests + * running with translation disabled (virtual real mode) or with VPM enabled. + * KVM will update the page table structures or disallow the access. + */ +INT_DEFINE_BEGIN(h_data_storage) + IVEC=0xe00 + IHSRR=1 + IDAR=1 + IDSISR=1 + IKVM_REAL=1 + IKVM_VIRT=1 +INT_DEFINE_END(h_data_storage) + +EXC_REAL_BEGIN(h_data_storage, 0xe00, 0x20) + GEN_INT_ENTRY h_data_storage, virt=0, ool=1 +EXC_REAL_END(h_data_storage, 0xe00, 0x20) +EXC_VIRT_BEGIN(h_data_storage, 0x4e00, 0x20) + GEN_INT_ENTRY h_data_storage, virt=1, ool=1 +EXC_VIRT_END(h_data_storage, 0x4e00, 0x20) +EXC_COMMON_BEGIN(h_data_storage_common) + GEN_COMMON h_data_storage + addi r3,r1,STACK_FRAME_OVERHEAD +BEGIN_MMU_FTR_SECTION + bl do_bad_page_fault_segv +MMU_FTR_SECTION_ELSE + bl unknown_exception +ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_TYPE_RADIX) + b interrupt_return_hsrr + + +/** + * Interrupt 0xe20 - Hypervisor Instruction Storage Interrupt (HISI). + * This is a synchronous interrupt in response to an MMU fault caused by a + * guest instruction fetch, similar to HDSI. + */ +INT_DEFINE_BEGIN(h_instr_storage) + IVEC=0xe20 + IHSRR=1 + IKVM_REAL=1 + IKVM_VIRT=1 +INT_DEFINE_END(h_instr_storage) + +EXC_REAL_BEGIN(h_instr_storage, 0xe20, 0x20) + GEN_INT_ENTRY h_instr_storage, virt=0, ool=1 +EXC_REAL_END(h_instr_storage, 0xe20, 0x20) +EXC_VIRT_BEGIN(h_instr_storage, 0x4e20, 0x20) + GEN_INT_ENTRY h_instr_storage, virt=1, ool=1 +EXC_VIRT_END(h_instr_storage, 0x4e20, 0x20) +EXC_COMMON_BEGIN(h_instr_storage_common) + GEN_COMMON h_instr_storage + addi r3,r1,STACK_FRAME_OVERHEAD + bl unknown_exception + b interrupt_return_hsrr + + +/** + * Interrupt 0xe40 - Hypervisor Emulation Assistance Interrupt. + */ +INT_DEFINE_BEGIN(emulation_assist) + IVEC=0xe40 + IHSRR=1 + IKVM_REAL=1 + IKVM_VIRT=1 +INT_DEFINE_END(emulation_assist) + +EXC_REAL_BEGIN(emulation_assist, 0xe40, 0x20) + GEN_INT_ENTRY emulation_assist, virt=0, ool=1 +EXC_REAL_END(emulation_assist, 0xe40, 0x20) +EXC_VIRT_BEGIN(emulation_assist, 0x4e40, 0x20) + GEN_INT_ENTRY emulation_assist, virt=1, ool=1 +EXC_VIRT_END(emulation_assist, 0x4e40, 0x20) +EXC_COMMON_BEGIN(emulation_assist_common) + GEN_COMMON emulation_assist + addi r3,r1,STACK_FRAME_OVERHEAD + bl emulation_assist_interrupt + REST_NVGPRS(r1) /* instruction emulation may change GPRs */ + b interrupt_return_hsrr + + +/** + * Interrupt 0xe60 - Hypervisor Maintenance Interrupt (HMI). + * This is an asynchronous interrupt caused by a Hypervisor Maintenance + * Exception. It is always taken in real mode but uses HSRR registers + * unlike SRESET and MCE. + * + * It is maskable in hardware by clearing MSR[EE], and partially soft-maskable + * with IRQS_DISABLED mask (i.e., local_irq_disable()). + * + * Handling: + * This is a special case, this is handled similarly to machine checks, with an + * initial real mode handler that is not soft-masked, which attempts to fix the + * problem. Then a regular handler which is soft-maskable and reports the + * problem. + * + * The emergency stack is used for the early real mode handler. + * + * XXX: unclear why MCE and HMI schemes could not be made common, e.g., + * either use soft-masking for the MCE, or use irq_work for the HMI. + * + * KVM: + * Unlike MCE, this calls into KVM without calling the real mode handler + * first. + */ +INT_DEFINE_BEGIN(hmi_exception_early) + IVEC=0xe60 + IHSRR=1 + IREALMODE_COMMON=1 + ISTACK=0 + IKUAP=0 /* We don't touch AMR here, we never go to virtual mode */ + IKVM_REAL=1 +INT_DEFINE_END(hmi_exception_early) + +INT_DEFINE_BEGIN(hmi_exception) + IVEC=0xe60 + IHSRR=1 + IMASK=IRQS_DISABLED + IKVM_REAL=1 +INT_DEFINE_END(hmi_exception) + +EXC_REAL_BEGIN(hmi_exception, 0xe60, 0x20) + GEN_INT_ENTRY hmi_exception_early, virt=0, ool=1 +EXC_REAL_END(hmi_exception, 0xe60, 0x20) +EXC_VIRT_NONE(0x4e60, 0x20) + +EXC_COMMON_BEGIN(hmi_exception_early_common) + __GEN_REALMODE_COMMON_ENTRY hmi_exception_early + + mr r10,r1 /* Save r1 */ + ld r1,PACAEMERGSP(r13) /* Use emergency stack for realmode */ + subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ + + __GEN_COMMON_BODY hmi_exception_early + + addi r3,r1,STACK_FRAME_OVERHEAD + bl hmi_exception_realmode + cmpdi cr0,r3,0 + bne 1f + + EXCEPTION_RESTORE_REGS hsrr=1 + HRFI_TO_USER_OR_KERNEL + +1: + /* + * Go to virtual mode and pull the HMI event information from + * firmware. + */ + EXCEPTION_RESTORE_REGS hsrr=1 + GEN_INT_ENTRY hmi_exception, virt=0 + +EXC_COMMON_BEGIN(hmi_exception_common) + GEN_COMMON hmi_exception + addi r3,r1,STACK_FRAME_OVERHEAD + bl handle_hmi_exception + b interrupt_return_hsrr + + +/** + * Interrupt 0xe80 - Directed Hypervisor Doorbell Interrupt. + * This is an asynchronous interrupt in response to a msgsnd doorbell. + * Similar to the 0xa00 doorbell but for host rather than guest. + * + * CFAR is not required (similar to doorbell_interrupt), unless KVM HV + * is enabled, in which case it may be a guest exit. Most PowerNV kernels + * include KVM support so it would be nice if this could be dynamically + * patched out if KVM was not currently running any guests. + */ +INT_DEFINE_BEGIN(h_doorbell) + IVEC=0xe80 + IHSRR=1 + IMASK=IRQS_DISABLED + IKVM_REAL=1 + IKVM_VIRT=1 +#ifndef CONFIG_KVM_BOOK3S_HV_POSSIBLE + ICFAR=0 +#endif +INT_DEFINE_END(h_doorbell) + +EXC_REAL_BEGIN(h_doorbell, 0xe80, 0x20) + GEN_INT_ENTRY h_doorbell, virt=0, ool=1 +EXC_REAL_END(h_doorbell, 0xe80, 0x20) +EXC_VIRT_BEGIN(h_doorbell, 0x4e80, 0x20) + GEN_INT_ENTRY h_doorbell, virt=1, ool=1 +EXC_VIRT_END(h_doorbell, 0x4e80, 0x20) +EXC_COMMON_BEGIN(h_doorbell_common) + GEN_COMMON h_doorbell + addi r3,r1,STACK_FRAME_OVERHEAD +#ifdef CONFIG_PPC_DOORBELL + bl doorbell_exception +#else + bl unknown_async_exception +#endif + b interrupt_return_hsrr + + +/** + * Interrupt 0xea0 - Hypervisor Virtualization Interrupt. + * This is an asynchronous interrupt in response to an "external exception". + * Similar to 0x500 but for host only. + * + * Like h_doorbell, CFAR is only required for KVM HV because this can be + * a guest exit. + */ +INT_DEFINE_BEGIN(h_virt_irq) + IVEC=0xea0 + IHSRR=1 + IMASK=IRQS_DISABLED + IKVM_REAL=1 + IKVM_VIRT=1 +#ifndef CONFIG_KVM_BOOK3S_HV_POSSIBLE + ICFAR=0 +#endif +INT_DEFINE_END(h_virt_irq) + +EXC_REAL_BEGIN(h_virt_irq, 0xea0, 0x20) + GEN_INT_ENTRY h_virt_irq, virt=0, ool=1 +EXC_REAL_END(h_virt_irq, 0xea0, 0x20) +EXC_VIRT_BEGIN(h_virt_irq, 0x4ea0, 0x20) + GEN_INT_ENTRY h_virt_irq, virt=1, ool=1 +EXC_VIRT_END(h_virt_irq, 0x4ea0, 0x20) +EXC_COMMON_BEGIN(h_virt_irq_common) + GEN_COMMON h_virt_irq + addi r3,r1,STACK_FRAME_OVERHEAD + bl do_IRQ + b interrupt_return_hsrr + + +EXC_REAL_NONE(0xec0, 0x20) +EXC_VIRT_NONE(0x4ec0, 0x20) +EXC_REAL_NONE(0xee0, 0x20) +EXC_VIRT_NONE(0x4ee0, 0x20) + + +/* + * Interrupt 0xf00 - Performance Monitor Interrupt (PMI, PMU). + * This is an asynchronous interrupt in response to a PMU exception. + * It is maskable in hardware by clearing MSR[EE], and soft-maskable with + * IRQS_PMI_DISABLED mask (NOTE: NOT local_irq_disable()). + * + * Handling: + * This calls into the perf subsystem. + * + * Like the watchdog soft-nmi, it appears an NMI interrupt to Linux, in that it + * runs under local_irq_disable. However it may be soft-masked in + * powerpc-specific code. + * + * If soft masked, the masked handler will note the pending interrupt for + * replay, and clear MSR[EE] in the interrupted context. + * + * CFAR is not used by perf interrupts so not required. + */ +INT_DEFINE_BEGIN(performance_monitor) + IVEC=0xf00 + IMASK=IRQS_PMI_DISABLED +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif + ICFAR=0 +INT_DEFINE_END(performance_monitor) + +EXC_REAL_BEGIN(performance_monitor, 0xf00, 0x20) + GEN_INT_ENTRY performance_monitor, virt=0, ool=1 +EXC_REAL_END(performance_monitor, 0xf00, 0x20) +EXC_VIRT_BEGIN(performance_monitor, 0x4f00, 0x20) + GEN_INT_ENTRY performance_monitor, virt=1, ool=1 +EXC_VIRT_END(performance_monitor, 0x4f00, 0x20) +EXC_COMMON_BEGIN(performance_monitor_common) + GEN_COMMON performance_monitor + addi r3,r1,STACK_FRAME_OVERHEAD + lbz r4,PACAIRQSOFTMASK(r13) + cmpdi r4,IRQS_ENABLED + bne 1f + bl performance_monitor_exception_async + b interrupt_return_srr +1: + bl performance_monitor_exception_nmi + /* Clear MSR_RI before setting SRR0 and SRR1. */ + li r9,0 + mtmsrd r9,1 + + kuap_kernel_restore r9, r10 + + EXCEPTION_RESTORE_REGS hsrr=0 + RFI_TO_KERNEL + +/** + * Interrupt 0xf20 - Vector Unavailable Interrupt. + * This is a synchronous interrupt in response to + * executing a vector (or altivec) instruction with MSR[VEC]=0. + * Similar to FP unavailable. + */ +INT_DEFINE_BEGIN(altivec_unavailable) + IVEC=0xf20 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(altivec_unavailable) + +EXC_REAL_BEGIN(altivec_unavailable, 0xf20, 0x20) + GEN_INT_ENTRY altivec_unavailable, virt=0, ool=1 +EXC_REAL_END(altivec_unavailable, 0xf20, 0x20) +EXC_VIRT_BEGIN(altivec_unavailable, 0x4f20, 0x20) + GEN_INT_ENTRY altivec_unavailable, virt=1, ool=1 +EXC_VIRT_END(altivec_unavailable, 0x4f20, 0x20) +EXC_COMMON_BEGIN(altivec_unavailable_common) + GEN_COMMON altivec_unavailable +#ifdef CONFIG_ALTIVEC +BEGIN_FTR_SECTION + beq 1f +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + BEGIN_FTR_SECTION_NESTED(69) + /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in + * transaction), go do TM stuff + */ + rldicl. r0, r12, (64-MSR_TS_LG), (64-2) + bne- 2f + END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69) +#endif + bl load_up_altivec + b fast_interrupt_return_srr +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +2: /* User process was in a transaction */ + addi r3,r1,STACK_FRAME_OVERHEAD + bl altivec_unavailable_tm + b interrupt_return_srr +#endif +1: +END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) +#endif + addi r3,r1,STACK_FRAME_OVERHEAD + bl altivec_unavailable_exception + b interrupt_return_srr + + +/** + * Interrupt 0xf40 - VSX Unavailable Interrupt. + * This is a synchronous interrupt in response to + * executing a VSX instruction with MSR[VSX]=0. + * Similar to FP unavailable. + */ +INT_DEFINE_BEGIN(vsx_unavailable) + IVEC=0xf40 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(vsx_unavailable) + +EXC_REAL_BEGIN(vsx_unavailable, 0xf40, 0x20) + GEN_INT_ENTRY vsx_unavailable, virt=0, ool=1 +EXC_REAL_END(vsx_unavailable, 0xf40, 0x20) +EXC_VIRT_BEGIN(vsx_unavailable, 0x4f40, 0x20) + GEN_INT_ENTRY vsx_unavailable, virt=1, ool=1 +EXC_VIRT_END(vsx_unavailable, 0x4f40, 0x20) +EXC_COMMON_BEGIN(vsx_unavailable_common) + GEN_COMMON vsx_unavailable +#ifdef CONFIG_VSX +BEGIN_FTR_SECTION + beq 1f +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + BEGIN_FTR_SECTION_NESTED(69) + /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in + * transaction), go do TM stuff + */ + rldicl. r0, r12, (64-MSR_TS_LG), (64-2) + bne- 2f + END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69) +#endif + b load_up_vsx +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +2: /* User process was in a transaction */ + addi r3,r1,STACK_FRAME_OVERHEAD + bl vsx_unavailable_tm + b interrupt_return_srr +#endif +1: +END_FTR_SECTION_IFSET(CPU_FTR_VSX) +#endif + addi r3,r1,STACK_FRAME_OVERHEAD + bl vsx_unavailable_exception + b interrupt_return_srr + + +/** + * Interrupt 0xf60 - Facility Unavailable Interrupt. + * This is a synchronous interrupt in response to + * executing an instruction without access to the facility that can be + * resolved by the OS (e.g., FSCR, MSR). + * Similar to FP unavailable. + */ +INT_DEFINE_BEGIN(facility_unavailable) + IVEC=0xf60 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(facility_unavailable) + +EXC_REAL_BEGIN(facility_unavailable, 0xf60, 0x20) + GEN_INT_ENTRY facility_unavailable, virt=0, ool=1 +EXC_REAL_END(facility_unavailable, 0xf60, 0x20) +EXC_VIRT_BEGIN(facility_unavailable, 0x4f60, 0x20) + GEN_INT_ENTRY facility_unavailable, virt=1, ool=1 +EXC_VIRT_END(facility_unavailable, 0x4f60, 0x20) +EXC_COMMON_BEGIN(facility_unavailable_common) + GEN_COMMON facility_unavailable + addi r3,r1,STACK_FRAME_OVERHEAD + bl facility_unavailable_exception + REST_NVGPRS(r1) /* instruction emulation may change GPRs */ + b interrupt_return_srr + + +/** + * Interrupt 0xf60 - Hypervisor Facility Unavailable Interrupt. + * This is a synchronous interrupt in response to + * executing an instruction without access to the facility that can only + * be resolved in HV mode (e.g., HFSCR). + * Similar to FP unavailable. + */ +INT_DEFINE_BEGIN(h_facility_unavailable) + IVEC=0xf80 + IHSRR=1 + IKVM_REAL=1 + IKVM_VIRT=1 +INT_DEFINE_END(h_facility_unavailable) + +EXC_REAL_BEGIN(h_facility_unavailable, 0xf80, 0x20) + GEN_INT_ENTRY h_facility_unavailable, virt=0, ool=1 +EXC_REAL_END(h_facility_unavailable, 0xf80, 0x20) +EXC_VIRT_BEGIN(h_facility_unavailable, 0x4f80, 0x20) + GEN_INT_ENTRY h_facility_unavailable, virt=1, ool=1 +EXC_VIRT_END(h_facility_unavailable, 0x4f80, 0x20) +EXC_COMMON_BEGIN(h_facility_unavailable_common) + GEN_COMMON h_facility_unavailable + addi r3,r1,STACK_FRAME_OVERHEAD + bl facility_unavailable_exception + REST_NVGPRS(r1) /* XXX Shouldn't be necessary in practice */ + b interrupt_return_hsrr + + +EXC_REAL_NONE(0xfa0, 0x20) +EXC_VIRT_NONE(0x4fa0, 0x20) +EXC_REAL_NONE(0xfc0, 0x20) +EXC_VIRT_NONE(0x4fc0, 0x20) +EXC_REAL_NONE(0xfe0, 0x20) +EXC_VIRT_NONE(0x4fe0, 0x20) + +EXC_REAL_NONE(0x1000, 0x100) +EXC_VIRT_NONE(0x5000, 0x100) +EXC_REAL_NONE(0x1100, 0x100) +EXC_VIRT_NONE(0x5100, 0x100) + +#ifdef CONFIG_CBE_RAS +INT_DEFINE_BEGIN(cbe_system_error) + IVEC=0x1200 + IHSRR=1 +INT_DEFINE_END(cbe_system_error) + +EXC_REAL_BEGIN(cbe_system_error, 0x1200, 0x100) + GEN_INT_ENTRY cbe_system_error, virt=0 +EXC_REAL_END(cbe_system_error, 0x1200, 0x100) +EXC_VIRT_NONE(0x5200, 0x100) +EXC_COMMON_BEGIN(cbe_system_error_common) + GEN_COMMON cbe_system_error + addi r3,r1,STACK_FRAME_OVERHEAD + bl cbe_system_error_exception + b interrupt_return_hsrr + +#else /* CONFIG_CBE_RAS */ +EXC_REAL_NONE(0x1200, 0x100) +EXC_VIRT_NONE(0x5200, 0x100) +#endif + +/** + * Interrupt 0x1300 - Instruction Address Breakpoint Interrupt. + * This has been removed from the ISA before 2.01, which is the earliest + * 64-bit BookS ISA supported, however the G5 / 970 implements this + * interrupt with a non-architected feature available through the support + * processor interface. + */ +INT_DEFINE_BEGIN(instruction_breakpoint) + IVEC=0x1300 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(instruction_breakpoint) + +EXC_REAL_BEGIN(instruction_breakpoint, 0x1300, 0x100) + GEN_INT_ENTRY instruction_breakpoint, virt=0 +EXC_REAL_END(instruction_breakpoint, 0x1300, 0x100) +EXC_VIRT_BEGIN(instruction_breakpoint, 0x5300, 0x100) + GEN_INT_ENTRY instruction_breakpoint, virt=1 +EXC_VIRT_END(instruction_breakpoint, 0x5300, 0x100) +EXC_COMMON_BEGIN(instruction_breakpoint_common) + GEN_COMMON instruction_breakpoint + addi r3,r1,STACK_FRAME_OVERHEAD + bl instruction_breakpoint_exception + b interrupt_return_srr + + +EXC_REAL_NONE(0x1400, 0x100) +EXC_VIRT_NONE(0x5400, 0x100) + +/** + * Interrupt 0x1500 - Soft Patch Interrupt + * + * Handling: + * This is an implementation specific interrupt which can be used for a + * range of exceptions. + * + * This interrupt handler is unique in that it runs the denormal assist + * code even for guests (and even in guest context) without going to KVM, + * for speed. POWER9 does not raise denorm exceptions, so this special case + * could be phased out in future to reduce special cases. + */ +INT_DEFINE_BEGIN(denorm_exception) + IVEC=0x1500 + IHSRR=1 + IBRANCH_TO_COMMON=0 + IKVM_REAL=1 +INT_DEFINE_END(denorm_exception) + +EXC_REAL_BEGIN(denorm_exception, 0x1500, 0x100) + GEN_INT_ENTRY denorm_exception, virt=0 +#ifdef CONFIG_PPC_DENORMALISATION + andis. r10,r12,(HSRR1_DENORM)@h /* denorm? */ + bne+ denorm_assist +#endif + GEN_BRANCH_TO_COMMON denorm_exception, virt=0 +EXC_REAL_END(denorm_exception, 0x1500, 0x100) +#ifdef CONFIG_PPC_DENORMALISATION +EXC_VIRT_BEGIN(denorm_exception, 0x5500, 0x100) + GEN_INT_ENTRY denorm_exception, virt=1 + andis. r10,r12,(HSRR1_DENORM)@h /* denorm? */ + bne+ denorm_assist + GEN_BRANCH_TO_COMMON denorm_exception, virt=1 +EXC_VIRT_END(denorm_exception, 0x5500, 0x100) +#else +EXC_VIRT_NONE(0x5500, 0x100) +#endif + +#ifdef CONFIG_PPC_DENORMALISATION +TRAMP_REAL_BEGIN(denorm_assist) +BEGIN_FTR_SECTION +/* + * To denormalise we need to move a copy of the register to itself. + * For POWER6 do that here for all FP regs. + */ + mfmsr r10 + ori r10,r10,(MSR_FP|MSR_FE0|MSR_FE1) + xori r10,r10,(MSR_FE0|MSR_FE1) + mtmsrd r10 + sync + + .Lreg=0 + .rept 32 + fmr .Lreg,.Lreg + .Lreg=.Lreg+1 + .endr + +FTR_SECTION_ELSE +/* + * To denormalise we need to move a copy of the register to itself. + * For POWER7 do that here for the first 32 VSX registers only. + */ + mfmsr r10 + oris r10,r10,MSR_VSX@h + mtmsrd r10 + sync + + .Lreg=0 + .rept 32 + XVCPSGNDP(.Lreg,.Lreg,.Lreg) + .Lreg=.Lreg+1 + .endr + +ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206) + +BEGIN_FTR_SECTION + b denorm_done +END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) +/* + * To denormalise we need to move a copy of the register to itself. + * For POWER8 we need to do that for all 64 VSX registers + */ + .Lreg=32 + .rept 32 + XVCPSGNDP(.Lreg,.Lreg,.Lreg) + .Lreg=.Lreg+1 + .endr + +denorm_done: + mfspr r11,SPRN_HSRR0 + subi r11,r11,4 + mtspr SPRN_HSRR0,r11 + mtcrf 0x80,r9 + ld r9,PACA_EXGEN+EX_R9(r13) +BEGIN_FTR_SECTION + ld r10,PACA_EXGEN+EX_PPR(r13) + mtspr SPRN_PPR,r10 +END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) +BEGIN_FTR_SECTION + ld r10,PACA_EXGEN+EX_CFAR(r13) + mtspr SPRN_CFAR,r10 +END_FTR_SECTION_IFSET(CPU_FTR_CFAR) + li r10,0 + stb r10,PACAHSRR_VALID(r13) + ld r10,PACA_EXGEN+EX_R10(r13) + ld r11,PACA_EXGEN+EX_R11(r13) + ld r12,PACA_EXGEN+EX_R12(r13) + ld r13,PACA_EXGEN+EX_R13(r13) + HRFI_TO_UNKNOWN + b . +#endif + +EXC_COMMON_BEGIN(denorm_exception_common) + GEN_COMMON denorm_exception + addi r3,r1,STACK_FRAME_OVERHEAD + bl unknown_exception + b interrupt_return_hsrr + + +#ifdef CONFIG_CBE_RAS +INT_DEFINE_BEGIN(cbe_maintenance) + IVEC=0x1600 + IHSRR=1 +INT_DEFINE_END(cbe_maintenance) + +EXC_REAL_BEGIN(cbe_maintenance, 0x1600, 0x100) + GEN_INT_ENTRY cbe_maintenance, virt=0 +EXC_REAL_END(cbe_maintenance, 0x1600, 0x100) +EXC_VIRT_NONE(0x5600, 0x100) +EXC_COMMON_BEGIN(cbe_maintenance_common) + GEN_COMMON cbe_maintenance + addi r3,r1,STACK_FRAME_OVERHEAD + bl cbe_maintenance_exception + b interrupt_return_hsrr + +#else /* CONFIG_CBE_RAS */ +EXC_REAL_NONE(0x1600, 0x100) +EXC_VIRT_NONE(0x5600, 0x100) +#endif + + +INT_DEFINE_BEGIN(altivec_assist) + IVEC=0x1700 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(altivec_assist) + +EXC_REAL_BEGIN(altivec_assist, 0x1700, 0x100) + GEN_INT_ENTRY altivec_assist, virt=0 +EXC_REAL_END(altivec_assist, 0x1700, 0x100) +EXC_VIRT_BEGIN(altivec_assist, 0x5700, 0x100) + GEN_INT_ENTRY altivec_assist, virt=1 +EXC_VIRT_END(altivec_assist, 0x5700, 0x100) +EXC_COMMON_BEGIN(altivec_assist_common) + GEN_COMMON altivec_assist + addi r3,r1,STACK_FRAME_OVERHEAD +#ifdef CONFIG_ALTIVEC + bl altivec_assist_exception + REST_NVGPRS(r1) /* instruction emulation may change GPRs */ +#else + bl unknown_exception +#endif + b interrupt_return_srr + + +#ifdef CONFIG_CBE_RAS +INT_DEFINE_BEGIN(cbe_thermal) + IVEC=0x1800 + IHSRR=1 +INT_DEFINE_END(cbe_thermal) + +EXC_REAL_BEGIN(cbe_thermal, 0x1800, 0x100) + GEN_INT_ENTRY cbe_thermal, virt=0 +EXC_REAL_END(cbe_thermal, 0x1800, 0x100) +EXC_VIRT_NONE(0x5800, 0x100) +EXC_COMMON_BEGIN(cbe_thermal_common) + GEN_COMMON cbe_thermal + addi r3,r1,STACK_FRAME_OVERHEAD + bl cbe_thermal_exception + b interrupt_return_hsrr + +#else /* CONFIG_CBE_RAS */ +EXC_REAL_NONE(0x1800, 0x100) +EXC_VIRT_NONE(0x5800, 0x100) +#endif + + +#ifdef CONFIG_PPC_WATCHDOG + +INT_DEFINE_BEGIN(soft_nmi) + IVEC=0x900 + ISTACK=0 + ICFAR=0 +INT_DEFINE_END(soft_nmi) + +/* + * Branch to soft_nmi_interrupt using the emergency stack. The emergency + * stack is one that is usable by maskable interrupts so long as MSR_EE + * remains off. It is used for recovery when something has corrupted the + * normal kernel stack, for example. The "soft NMI" must not use the process + * stack because we want irq disabled sections to avoid touching the stack + * at all (other than PMU interrupts), so use the emergency stack for this, + * and run it entirely with interrupts hard disabled. + */ +EXC_COMMON_BEGIN(soft_nmi_common) + mr r10,r1 + ld r1,PACAEMERGSP(r13) + subi r1,r1,INT_FRAME_SIZE + __GEN_COMMON_BODY soft_nmi + + addi r3,r1,STACK_FRAME_OVERHEAD + bl soft_nmi_interrupt + + /* Clear MSR_RI before setting SRR0 and SRR1. */ + li r9,0 + mtmsrd r9,1 + + kuap_kernel_restore r9, r10 + + EXCEPTION_RESTORE_REGS hsrr=0 + RFI_TO_KERNEL + +#endif /* CONFIG_PPC_WATCHDOG */ + +/* + * An interrupt came in while soft-disabled. We set paca->irq_happened, then: + * - If it was a decrementer interrupt, we bump the dec to max and return. + * - If it was a doorbell we return immediately since doorbells are edge + * triggered and won't automatically refire. + * - If it was a HMI we return immediately since we handled it in realmode + * and it won't refire. + * - Else it is one of PACA_IRQ_MUST_HARD_MASK, so hard disable and return. + * This is called with r10 containing the value to OR to the paca field. + */ +.macro MASKED_INTERRUPT hsrr=0 + .if \hsrr +masked_Hinterrupt: + .else +masked_interrupt: + .endif + stw r9,PACA_EXGEN+EX_CCR(r13) +#ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG + /* + * Ensure there was no previous MUST_HARD_MASK interrupt or + * HARD_DIS setting. If this does fire, the interrupt is still + * masked and MSR[EE] will be cleared on return, so no need to + * panic, but somebody probably enabled MSR[EE] under + * PACA_IRQ_HARD_DIS, mtmsr(mfmsr() | MSR_x) being a common + * cause. + */ + lbz r9,PACAIRQHAPPENED(r13) + andi. r9,r9,(PACA_IRQ_MUST_HARD_MASK|PACA_IRQ_HARD_DIS) +0: tdnei r9,0 + EMIT_WARN_ENTRY 0b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) +#endif + lbz r9,PACAIRQHAPPENED(r13) + or r9,r9,r10 + stb r9,PACAIRQHAPPENED(r13) + + .if ! \hsrr + cmpwi r10,PACA_IRQ_DEC + bne 1f + LOAD_REG_IMMEDIATE(r9, 0x7fffffff) + mtspr SPRN_DEC,r9 +#ifdef CONFIG_PPC_WATCHDOG + lwz r9,PACA_EXGEN+EX_CCR(r13) + b soft_nmi_common +#else + b 2f +#endif + .endif + +1: andi. r10,r10,PACA_IRQ_MUST_HARD_MASK + beq 2f + xori r12,r12,MSR_EE /* clear MSR_EE */ + .if \hsrr + mtspr SPRN_HSRR1,r12 + .else + mtspr SPRN_SRR1,r12 + .endif + ori r9,r9,PACA_IRQ_HARD_DIS + stb r9,PACAIRQHAPPENED(r13) +2: /* done */ + li r9,0 + .if \hsrr + stb r9,PACAHSRR_VALID(r13) + .else + stb r9,PACASRR_VALID(r13) + .endif + + SEARCH_RESTART_TABLE + cmpdi r12,0 + beq 3f + .if \hsrr + mtspr SPRN_HSRR0,r12 + .else + mtspr SPRN_SRR0,r12 + .endif +3: + + ld r9,PACA_EXGEN+EX_CTR(r13) + mtctr r9 + lwz r9,PACA_EXGEN+EX_CCR(r13) + mtcrf 0x80,r9 + std r1,PACAR1(r13) + ld r9,PACA_EXGEN+EX_R9(r13) + ld r10,PACA_EXGEN+EX_R10(r13) + ld r11,PACA_EXGEN+EX_R11(r13) + ld r12,PACA_EXGEN+EX_R12(r13) + ld r13,PACA_EXGEN+EX_R13(r13) + /* May return to masked low address where r13 is not set up */ + .if \hsrr + HRFI_TO_KERNEL + .else + RFI_TO_KERNEL + .endif + b . +.endm + +TRAMP_REAL_BEGIN(stf_barrier_fallback) + std r9,PACA_EXRFI+EX_R9(r13) + std r10,PACA_EXRFI+EX_R10(r13) + sync + ld r9,PACA_EXRFI+EX_R9(r13) + ld r10,PACA_EXRFI+EX_R10(r13) + ori 31,31,0 + .rept 14 + b 1f +1: + .endr + blr + +/* Clobbers r10, r11, ctr */ +.macro L1D_DISPLACEMENT_FLUSH + ld r10,PACA_RFI_FLUSH_FALLBACK_AREA(r13) + ld r11,PACA_L1D_FLUSH_SIZE(r13) + srdi r11,r11,(7 + 3) /* 128 byte lines, unrolled 8x */ + mtctr r11 + DCBT_BOOK3S_STOP_ALL_STREAM_IDS(r11) /* Stop prefetch streams */ + + /* order ld/st prior to dcbt stop all streams with flushing */ + sync + + /* + * The load addresses are at staggered offsets within cachelines, + * which suits some pipelines better (on others it should not + * hurt). + */ +1: + ld r11,(0x80 + 8)*0(r10) + ld r11,(0x80 + 8)*1(r10) + ld r11,(0x80 + 8)*2(r10) + ld r11,(0x80 + 8)*3(r10) + ld r11,(0x80 + 8)*4(r10) + ld r11,(0x80 + 8)*5(r10) + ld r11,(0x80 + 8)*6(r10) + ld r11,(0x80 + 8)*7(r10) + addi r10,r10,0x80*8 + bdnz 1b +.endm + +TRAMP_REAL_BEGIN(entry_flush_fallback) + std r9,PACA_EXRFI+EX_R9(r13) + std r10,PACA_EXRFI+EX_R10(r13) + std r11,PACA_EXRFI+EX_R11(r13) + mfctr r9 + L1D_DISPLACEMENT_FLUSH + mtctr r9 + ld r9,PACA_EXRFI+EX_R9(r13) + ld r10,PACA_EXRFI+EX_R10(r13) + ld r11,PACA_EXRFI+EX_R11(r13) + blr + +/* + * The SCV entry flush happens with interrupts enabled, so it must disable + * to prevent EXRFI being clobbered by NMIs (e.g., soft_nmi_common). r10 + * (containing LR) does not need to be preserved here because scv entry + * puts 0 in the pt_regs, CTR can be clobbered for the same reason. + */ +TRAMP_REAL_BEGIN(scv_entry_flush_fallback) + li r10,0 + mtmsrd r10,1 + lbz r10,PACAIRQHAPPENED(r13) + ori r10,r10,PACA_IRQ_HARD_DIS + stb r10,PACAIRQHAPPENED(r13) + std r11,PACA_EXRFI+EX_R11(r13) + L1D_DISPLACEMENT_FLUSH + ld r11,PACA_EXRFI+EX_R11(r13) + li r10,MSR_RI + mtmsrd r10,1 + blr + +TRAMP_REAL_BEGIN(rfi_flush_fallback) + SET_SCRATCH0(r13); + GET_PACA(r13); + std r1,PACA_EXRFI+EX_R12(r13) + ld r1,PACAKSAVE(r13) + std r9,PACA_EXRFI+EX_R9(r13) + std r10,PACA_EXRFI+EX_R10(r13) + std r11,PACA_EXRFI+EX_R11(r13) + mfctr r9 + L1D_DISPLACEMENT_FLUSH + mtctr r9 + ld r9,PACA_EXRFI+EX_R9(r13) + ld r10,PACA_EXRFI+EX_R10(r13) + ld r11,PACA_EXRFI+EX_R11(r13) + ld r1,PACA_EXRFI+EX_R12(r13) + GET_SCRATCH0(r13); + rfid + +TRAMP_REAL_BEGIN(hrfi_flush_fallback) + SET_SCRATCH0(r13); + GET_PACA(r13); + std r1,PACA_EXRFI+EX_R12(r13) + ld r1,PACAKSAVE(r13) + std r9,PACA_EXRFI+EX_R9(r13) + std r10,PACA_EXRFI+EX_R10(r13) + std r11,PACA_EXRFI+EX_R11(r13) + mfctr r9 + L1D_DISPLACEMENT_FLUSH + mtctr r9 + ld r9,PACA_EXRFI+EX_R9(r13) + ld r10,PACA_EXRFI+EX_R10(r13) + ld r11,PACA_EXRFI+EX_R11(r13) + ld r1,PACA_EXRFI+EX_R12(r13) + GET_SCRATCH0(r13); + hrfid + +TRAMP_REAL_BEGIN(rfscv_flush_fallback) + /* system call volatile */ + mr r7,r13 + GET_PACA(r13); + mr r8,r1 + ld r1,PACAKSAVE(r13) + mfctr r9 + ld r10,PACA_RFI_FLUSH_FALLBACK_AREA(r13) + ld r11,PACA_L1D_FLUSH_SIZE(r13) + srdi r11,r11,(7 + 3) /* 128 byte lines, unrolled 8x */ + mtctr r11 + DCBT_BOOK3S_STOP_ALL_STREAM_IDS(r11) /* Stop prefetch streams */ + + /* order ld/st prior to dcbt stop all streams with flushing */ + sync + + /* + * The load adresses are at staggered offsets within cachelines, + * which suits some pipelines better (on others it should not + * hurt). + */ +1: + ld r11,(0x80 + 8)*0(r10) + ld r11,(0x80 + 8)*1(r10) + ld r11,(0x80 + 8)*2(r10) + ld r11,(0x80 + 8)*3(r10) + ld r11,(0x80 + 8)*4(r10) + ld r11,(0x80 + 8)*5(r10) + ld r11,(0x80 + 8)*6(r10) + ld r11,(0x80 + 8)*7(r10) + addi r10,r10,0x80*8 + bdnz 1b + + mtctr r9 + li r9,0 + li r10,0 + li r11,0 + mr r1,r8 + mr r13,r7 + RFSCV + +USE_TEXT_SECTION() + +#ifdef CONFIG_KVM_BOOK3S_64_HANDLER +kvm_interrupt: + /* + * The conditional branch in KVMTEST can't reach all the way, + * make a stub. + */ + b kvmppc_interrupt +#endif + +_GLOBAL(do_uaccess_flush) + UACCESS_FLUSH_FIXUP_SECTION + nop + nop + nop + blr + L1D_DISPLACEMENT_FLUSH + blr +_ASM_NOKPROBE_SYMBOL(do_uaccess_flush) +EXPORT_SYMBOL(do_uaccess_flush) + + +MASKED_INTERRUPT +MASKED_INTERRUPT hsrr=1 + +USE_FIXED_SECTION(virt_trampolines) + /* + * All code below __end_soft_masked is treated as soft-masked. If + * any code runs here with MSR[EE]=1, it must then cope with pending + * soft interrupt being raised (i.e., by ensuring it is replayed). + * + * The __end_interrupts marker must be past the out-of-line (OOL) + * handlers, so that they are copied to real address 0x100 when running + * a relocatable kernel. This ensures they can be reached from the short + * trampoline handlers (like 0x4f00, 0x4f20, etc.) which branch + * directly, without using LOAD_HANDLER(). + */ + .align 7 + .globl __end_interrupts +__end_interrupts: +DEFINE_FIXED_SYMBOL(__end_interrupts, virt_trampolines) + +CLOSE_FIXED_SECTION(real_vectors); +CLOSE_FIXED_SECTION(real_trampolines); +CLOSE_FIXED_SECTION(virt_vectors); +CLOSE_FIXED_SECTION(virt_trampolines); + +USE_TEXT_SECTION() + +/* MSR[RI] should be clear because this uses SRR[01] */ +_GLOBAL(enable_machine_check) + mflr r0 + bcl 20,31,$+4 +0: mflr r3 + addi r3,r3,(1f - 0b) + mtspr SPRN_SRR0,r3 + mfmsr r3 + ori r3,r3,MSR_ME + mtspr SPRN_SRR1,r3 + RFI_TO_KERNEL +1: mtlr r0 + blr + +/* MSR[RI] should be clear because this uses SRR[01] */ +disable_machine_check: + mflr r0 + bcl 20,31,$+4 +0: mflr r3 + addi r3,r3,(1f - 0b) + mtspr SPRN_SRR0,r3 + mfmsr r3 + li r4,MSR_ME + andc r3,r3,r4 + mtspr SPRN_SRR1,r3 + RFI_TO_KERNEL +1: mtlr r0 + blr diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c new file mode 100644 index 000000000..3ff2da7b1 --- /dev/null +++ b/arch/powerpc/kernel/fadump.c @@ -0,0 +1,1742 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Firmware Assisted dump: A robust mechanism to get reliable kernel crash + * dump with assistance from firmware. This approach does not use kexec, + * instead firmware assists in booting the kdump kernel while preserving + * memory contents. The most of the code implementation has been adapted + * from phyp assisted dump implementation written by Linas Vepstas and + * Manish Ahuja + * + * Copyright 2011 IBM Corporation + * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> + */ + +#undef DEBUG +#define pr_fmt(fmt) "fadump: " fmt + +#include <linux/string.h> +#include <linux/memblock.h> +#include <linux/delay.h> +#include <linux/seq_file.h> +#include <linux/crash_dump.h> +#include <linux/kobject.h> +#include <linux/sysfs.h> +#include <linux/slab.h> +#include <linux/cma.h> +#include <linux/hugetlb.h> +#include <linux/debugfs.h> +#include <linux/of.h> +#include <linux/of_fdt.h> + +#include <asm/page.h> +#include <asm/fadump.h> +#include <asm/fadump-internal.h> +#include <asm/setup.h> +#include <asm/interrupt.h> + +/* + * The CPU who acquired the lock to trigger the fadump crash should + * wait for other CPUs to enter. + * + * The timeout is in milliseconds. + */ +#define CRASH_TIMEOUT 500 + +static struct fw_dump fw_dump; + +static void __init fadump_reserve_crash_area(u64 base); + +#ifndef CONFIG_PRESERVE_FA_DUMP + +static struct kobject *fadump_kobj; + +static atomic_t cpus_in_fadump; +static DEFINE_MUTEX(fadump_mutex); + +static struct fadump_mrange_info crash_mrange_info = { "crash", NULL, 0, 0, 0, false }; + +#define RESERVED_RNGS_SZ 16384 /* 16K - 128 entries */ +#define RESERVED_RNGS_CNT (RESERVED_RNGS_SZ / \ + sizeof(struct fadump_memory_range)) +static struct fadump_memory_range rngs[RESERVED_RNGS_CNT]; +static struct fadump_mrange_info +reserved_mrange_info = { "reserved", rngs, RESERVED_RNGS_SZ, 0, RESERVED_RNGS_CNT, true }; + +static void __init early_init_dt_scan_reserved_ranges(unsigned long node); + +#ifdef CONFIG_CMA +static struct cma *fadump_cma; + +/* + * fadump_cma_init() - Initialize CMA area from a fadump reserved memory + * + * This function initializes CMA area from fadump reserved memory. + * The total size of fadump reserved memory covers for boot memory size + * + cpu data size + hpte size and metadata. + * Initialize only the area equivalent to boot memory size for CMA use. + * The remaining portion of fadump reserved memory will be not given + * to CMA and pages for those will stay reserved. boot memory size is + * aligned per CMA requirement to satisy cma_init_reserved_mem() call. + * But for some reason even if it fails we still have the memory reservation + * with us and we can still continue doing fadump. + */ +static int __init fadump_cma_init(void) +{ + unsigned long long base, size; + int rc; + + if (!fw_dump.fadump_enabled) + return 0; + + /* + * Do not use CMA if user has provided fadump=nocma kernel parameter. + * Return 1 to continue with fadump old behaviour. + */ + if (fw_dump.nocma) + return 1; + + base = fw_dump.reserve_dump_area_start; + size = fw_dump.boot_memory_size; + + if (!size) + return 0; + + rc = cma_init_reserved_mem(base, size, 0, "fadump_cma", &fadump_cma); + if (rc) { + pr_err("Failed to init cma area for firmware-assisted dump,%d\n", rc); + /* + * Though the CMA init has failed we still have memory + * reservation with us. The reserved memory will be + * blocked from production system usage. Hence return 1, + * so that we can continue with fadump. + */ + return 1; + } + + /* + * If CMA activation fails, keep the pages reserved, instead of + * exposing them to buddy allocator. Same as 'fadump=nocma' case. + */ + cma_reserve_pages_on_error(fadump_cma); + + /* + * So we now have successfully initialized cma area for fadump. + */ + pr_info("Initialized 0x%lx bytes cma area at %ldMB from 0x%lx " + "bytes of memory reserved for firmware-assisted dump\n", + cma_get_size(fadump_cma), + (unsigned long)cma_get_base(fadump_cma) >> 20, + fw_dump.reserve_dump_area_size); + return 1; +} +#else +static int __init fadump_cma_init(void) { return 1; } +#endif /* CONFIG_CMA */ + +/* Scan the Firmware Assisted dump configuration details. */ +int __init early_init_dt_scan_fw_dump(unsigned long node, const char *uname, + int depth, void *data) +{ + if (depth == 0) { + early_init_dt_scan_reserved_ranges(node); + return 0; + } + + if (depth != 1) + return 0; + + if (strcmp(uname, "rtas") == 0) { + rtas_fadump_dt_scan(&fw_dump, node); + return 1; + } + + if (strcmp(uname, "ibm,opal") == 0) { + opal_fadump_dt_scan(&fw_dump, node); + return 1; + } + + return 0; +} + +/* + * If fadump is registered, check if the memory provided + * falls within boot memory area and reserved memory area. + */ +int is_fadump_memory_area(u64 addr, unsigned long size) +{ + u64 d_start, d_end; + + if (!fw_dump.dump_registered) + return 0; + + if (!size) + return 0; + + d_start = fw_dump.reserve_dump_area_start; + d_end = d_start + fw_dump.reserve_dump_area_size; + if (((addr + size) > d_start) && (addr <= d_end)) + return 1; + + return (addr <= fw_dump.boot_mem_top); +} + +int should_fadump_crash(void) +{ + if (!fw_dump.dump_registered || !fw_dump.fadumphdr_addr) + return 0; + return 1; +} + +int is_fadump_active(void) +{ + return fw_dump.dump_active; +} + +/* + * Returns true, if there are no holes in memory area between d_start to d_end, + * false otherwise. + */ +static bool is_fadump_mem_area_contiguous(u64 d_start, u64 d_end) +{ + phys_addr_t reg_start, reg_end; + bool ret = false; + u64 i, start, end; + + for_each_mem_range(i, ®_start, ®_end) { + start = max_t(u64, d_start, reg_start); + end = min_t(u64, d_end, reg_end); + if (d_start < end) { + /* Memory hole from d_start to start */ + if (start > d_start) + break; + + if (end == d_end) { + ret = true; + break; + } + + d_start = end + 1; + } + } + + return ret; +} + +/* + * Returns true, if there are no holes in boot memory area, + * false otherwise. + */ +bool is_fadump_boot_mem_contiguous(void) +{ + unsigned long d_start, d_end; + bool ret = false; + int i; + + for (i = 0; i < fw_dump.boot_mem_regs_cnt; i++) { + d_start = fw_dump.boot_mem_addr[i]; + d_end = d_start + fw_dump.boot_mem_sz[i]; + + ret = is_fadump_mem_area_contiguous(d_start, d_end); + if (!ret) + break; + } + + return ret; +} + +/* + * Returns true, if there are no holes in reserved memory area, + * false otherwise. + */ +bool is_fadump_reserved_mem_contiguous(void) +{ + u64 d_start, d_end; + + d_start = fw_dump.reserve_dump_area_start; + d_end = d_start + fw_dump.reserve_dump_area_size; + return is_fadump_mem_area_contiguous(d_start, d_end); +} + +/* Print firmware assisted dump configurations for debugging purpose. */ +static void __init fadump_show_config(void) +{ + int i; + + pr_debug("Support for firmware-assisted dump (fadump): %s\n", + (fw_dump.fadump_supported ? "present" : "no support")); + + if (!fw_dump.fadump_supported) + return; + + pr_debug("Fadump enabled : %s\n", + (fw_dump.fadump_enabled ? "yes" : "no")); + pr_debug("Dump Active : %s\n", + (fw_dump.dump_active ? "yes" : "no")); + pr_debug("Dump section sizes:\n"); + pr_debug(" CPU state data size: %lx\n", fw_dump.cpu_state_data_size); + pr_debug(" HPTE region size : %lx\n", fw_dump.hpte_region_size); + pr_debug(" Boot memory size : %lx\n", fw_dump.boot_memory_size); + pr_debug(" Boot memory top : %llx\n", fw_dump.boot_mem_top); + pr_debug("Boot memory regions cnt: %llx\n", fw_dump.boot_mem_regs_cnt); + for (i = 0; i < fw_dump.boot_mem_regs_cnt; i++) { + pr_debug("[%03d] base = %llx, size = %llx\n", i, + fw_dump.boot_mem_addr[i], fw_dump.boot_mem_sz[i]); + } +} + +/** + * fadump_calculate_reserve_size(): reserve variable boot area 5% of System RAM + * + * Function to find the largest memory size we need to reserve during early + * boot process. This will be the size of the memory that is required for a + * kernel to boot successfully. + * + * This function has been taken from phyp-assisted dump feature implementation. + * + * returns larger of 256MB or 5% rounded down to multiples of 256MB. + * + * TODO: Come up with better approach to find out more accurate memory size + * that is required for a kernel to boot successfully. + * + */ +static __init u64 fadump_calculate_reserve_size(void) +{ + u64 base, size, bootmem_min; + int ret; + + if (fw_dump.reserve_bootvar) + pr_warn("'fadump_reserve_mem=' parameter is deprecated in favor of 'crashkernel=' parameter.\n"); + + /* + * Check if the size is specified through crashkernel= cmdline + * option. If yes, then use that but ignore base as fadump reserves + * memory at a predefined offset. + */ + ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), + &size, &base); + if (ret == 0 && size > 0) { + unsigned long max_size; + + if (fw_dump.reserve_bootvar) + pr_info("Using 'crashkernel=' parameter for memory reservation.\n"); + + fw_dump.reserve_bootvar = (unsigned long)size; + + /* + * Adjust if the boot memory size specified is above + * the upper limit. + */ + max_size = memblock_phys_mem_size() / MAX_BOOT_MEM_RATIO; + if (fw_dump.reserve_bootvar > max_size) { + fw_dump.reserve_bootvar = max_size; + pr_info("Adjusted boot memory size to %luMB\n", + (fw_dump.reserve_bootvar >> 20)); + } + + return fw_dump.reserve_bootvar; + } else if (fw_dump.reserve_bootvar) { + /* + * 'fadump_reserve_mem=' is being used to reserve memory + * for firmware-assisted dump. + */ + return fw_dump.reserve_bootvar; + } + + /* divide by 20 to get 5% of value */ + size = memblock_phys_mem_size() / 20; + + /* round it down in multiples of 256 */ + size = size & ~0x0FFFFFFFUL; + + /* Truncate to memory_limit. We don't want to over reserve the memory.*/ + if (memory_limit && size > memory_limit) + size = memory_limit; + + bootmem_min = fw_dump.ops->fadump_get_bootmem_min(); + return (size > bootmem_min ? size : bootmem_min); +} + +/* + * Calculate the total memory size required to be reserved for + * firmware-assisted dump registration. + */ +static unsigned long __init get_fadump_area_size(void) +{ + unsigned long size = 0; + + size += fw_dump.cpu_state_data_size; + size += fw_dump.hpte_region_size; + /* + * Account for pagesize alignment of boot memory area destination address. + * This faciliates in mmap reading of first kernel's memory. + */ + size = PAGE_ALIGN(size); + size += fw_dump.boot_memory_size; + size += sizeof(struct fadump_crash_info_header); + size += sizeof(struct elfhdr); /* ELF core header.*/ + size += sizeof(struct elf_phdr); /* place holder for cpu notes */ + /* Program headers for crash memory regions. */ + size += sizeof(struct elf_phdr) * (memblock_num_regions(memory) + 2); + + size = PAGE_ALIGN(size); + + /* This is to hold kernel metadata on platforms that support it */ + size += (fw_dump.ops->fadump_get_metadata_size ? + fw_dump.ops->fadump_get_metadata_size() : 0); + return size; +} + +static int __init add_boot_mem_region(unsigned long rstart, + unsigned long rsize) +{ + int i = fw_dump.boot_mem_regs_cnt++; + + if (fw_dump.boot_mem_regs_cnt > FADUMP_MAX_MEM_REGS) { + fw_dump.boot_mem_regs_cnt = FADUMP_MAX_MEM_REGS; + return 0; + } + + pr_debug("Added boot memory range[%d] [%#016lx-%#016lx)\n", + i, rstart, (rstart + rsize)); + fw_dump.boot_mem_addr[i] = rstart; + fw_dump.boot_mem_sz[i] = rsize; + return 1; +} + +/* + * Firmware usually has a hard limit on the data it can copy per region. + * Honour that by splitting a memory range into multiple regions. + */ +static int __init add_boot_mem_regions(unsigned long mstart, + unsigned long msize) +{ + unsigned long rstart, rsize, max_size; + int ret = 1; + + rstart = mstart; + max_size = fw_dump.max_copy_size ? fw_dump.max_copy_size : msize; + while (msize) { + if (msize > max_size) + rsize = max_size; + else + rsize = msize; + + ret = add_boot_mem_region(rstart, rsize); + if (!ret) + break; + + msize -= rsize; + rstart += rsize; + } + + return ret; +} + +static int __init fadump_get_boot_mem_regions(void) +{ + unsigned long size, cur_size, hole_size, last_end; + unsigned long mem_size = fw_dump.boot_memory_size; + phys_addr_t reg_start, reg_end; + int ret = 1; + u64 i; + + fw_dump.boot_mem_regs_cnt = 0; + + last_end = 0; + hole_size = 0; + cur_size = 0; + for_each_mem_range(i, ®_start, ®_end) { + size = reg_end - reg_start; + hole_size += (reg_start - last_end); + + if ((cur_size + size) >= mem_size) { + size = (mem_size - cur_size); + ret = add_boot_mem_regions(reg_start, size); + break; + } + + mem_size -= size; + cur_size += size; + ret = add_boot_mem_regions(reg_start, size); + if (!ret) + break; + + last_end = reg_end; + } + fw_dump.boot_mem_top = PAGE_ALIGN(fw_dump.boot_memory_size + hole_size); + + return ret; +} + +/* + * Returns true, if the given range overlaps with reserved memory ranges + * starting at idx. Also, updates idx to index of overlapping memory range + * with the given memory range. + * False, otherwise. + */ +static bool __init overlaps_reserved_ranges(u64 base, u64 end, int *idx) +{ + bool ret = false; + int i; + + for (i = *idx; i < reserved_mrange_info.mem_range_cnt; i++) { + u64 rbase = reserved_mrange_info.mem_ranges[i].base; + u64 rend = rbase + reserved_mrange_info.mem_ranges[i].size; + + if (end <= rbase) + break; + + if ((end > rbase) && (base < rend)) { + *idx = i; + ret = true; + break; + } + } + + return ret; +} + +/* + * Locate a suitable memory area to reserve memory for FADump. While at it, + * lookup reserved-ranges & avoid overlap with them, as they are used by F/W. + */ +static u64 __init fadump_locate_reserve_mem(u64 base, u64 size) +{ + struct fadump_memory_range *mrngs; + phys_addr_t mstart, mend; + int idx = 0; + u64 i, ret = 0; + + mrngs = reserved_mrange_info.mem_ranges; + for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, + &mstart, &mend, NULL) { + pr_debug("%llu) mstart: %llx, mend: %llx, base: %llx\n", + i, mstart, mend, base); + + if (mstart > base) + base = PAGE_ALIGN(mstart); + + while ((mend > base) && ((mend - base) >= size)) { + if (!overlaps_reserved_ranges(base, base+size, &idx)) { + ret = base; + goto out; + } + + base = mrngs[idx].base + mrngs[idx].size; + base = PAGE_ALIGN(base); + } + } + +out: + return ret; +} + +int __init fadump_reserve_mem(void) +{ + u64 base, size, mem_boundary, bootmem_min; + int ret = 1; + + if (!fw_dump.fadump_enabled) + return 0; + + if (!fw_dump.fadump_supported) { + pr_info("Firmware-Assisted Dump is not supported on this hardware\n"); + goto error_out; + } + + /* + * Initialize boot memory size + * If dump is active then we have already calculated the size during + * first kernel. + */ + if (!fw_dump.dump_active) { + fw_dump.boot_memory_size = + PAGE_ALIGN(fadump_calculate_reserve_size()); +#ifdef CONFIG_CMA + if (!fw_dump.nocma) { + fw_dump.boot_memory_size = + ALIGN(fw_dump.boot_memory_size, + CMA_MIN_ALIGNMENT_BYTES); + } +#endif + + bootmem_min = fw_dump.ops->fadump_get_bootmem_min(); + if (fw_dump.boot_memory_size < bootmem_min) { + pr_err("Can't enable fadump with boot memory size (0x%lx) less than 0x%llx\n", + fw_dump.boot_memory_size, bootmem_min); + goto error_out; + } + + if (!fadump_get_boot_mem_regions()) { + pr_err("Too many holes in boot memory area to enable fadump\n"); + goto error_out; + } + } + + /* + * Calculate the memory boundary. + * If memory_limit is less than actual memory boundary then reserve + * the memory for fadump beyond the memory_limit and adjust the + * memory_limit accordingly, so that the running kernel can run with + * specified memory_limit. + */ + if (memory_limit && memory_limit < memblock_end_of_DRAM()) { + size = get_fadump_area_size(); + if ((memory_limit + size) < memblock_end_of_DRAM()) + memory_limit += size; + else + memory_limit = memblock_end_of_DRAM(); + printk(KERN_INFO "Adjusted memory_limit for firmware-assisted" + " dump, now %#016llx\n", memory_limit); + } + if (memory_limit) + mem_boundary = memory_limit; + else + mem_boundary = memblock_end_of_DRAM(); + + base = fw_dump.boot_mem_top; + size = get_fadump_area_size(); + fw_dump.reserve_dump_area_size = size; + if (fw_dump.dump_active) { + pr_info("Firmware-assisted dump is active.\n"); + +#ifdef CONFIG_HUGETLB_PAGE + /* + * FADump capture kernel doesn't care much about hugepages. + * In fact, handling hugepages in capture kernel is asking for + * trouble. So, disable HugeTLB support when fadump is active. + */ + hugetlb_disabled = true; +#endif + /* + * If last boot has crashed then reserve all the memory + * above boot memory size so that we don't touch it until + * dump is written to disk by userspace tool. This memory + * can be released for general use by invalidating fadump. + */ + fadump_reserve_crash_area(base); + + pr_debug("fadumphdr_addr = %#016lx\n", fw_dump.fadumphdr_addr); + pr_debug("Reserve dump area start address: 0x%lx\n", + fw_dump.reserve_dump_area_start); + } else { + /* + * Reserve memory at an offset closer to bottom of the RAM to + * minimize the impact of memory hot-remove operation. + */ + base = fadump_locate_reserve_mem(base, size); + + if (!base || (base + size > mem_boundary)) { + pr_err("Failed to find memory chunk for reservation!\n"); + goto error_out; + } + fw_dump.reserve_dump_area_start = base; + + /* + * Calculate the kernel metadata address and register it with + * f/w if the platform supports. + */ + if (fw_dump.ops->fadump_setup_metadata && + (fw_dump.ops->fadump_setup_metadata(&fw_dump) < 0)) + goto error_out; + + if (memblock_reserve(base, size)) { + pr_err("Failed to reserve memory!\n"); + goto error_out; + } + + pr_info("Reserved %lldMB of memory at %#016llx (System RAM: %lldMB)\n", + (size >> 20), base, (memblock_phys_mem_size() >> 20)); + + ret = fadump_cma_init(); + } + + return ret; +error_out: + fw_dump.fadump_enabled = 0; + fw_dump.reserve_dump_area_size = 0; + return 0; +} + +/* Look for fadump= cmdline option. */ +static int __init early_fadump_param(char *p) +{ + if (!p) + return 1; + + if (strncmp(p, "on", 2) == 0) + fw_dump.fadump_enabled = 1; + else if (strncmp(p, "off", 3) == 0) + fw_dump.fadump_enabled = 0; + else if (strncmp(p, "nocma", 5) == 0) { + fw_dump.fadump_enabled = 1; + fw_dump.nocma = 1; + } + + return 0; +} +early_param("fadump", early_fadump_param); + +/* + * Look for fadump_reserve_mem= cmdline option + * TODO: Remove references to 'fadump_reserve_mem=' parameter, + * the sooner 'crashkernel=' parameter is accustomed to. + */ +static int __init early_fadump_reserve_mem(char *p) +{ + if (p) + fw_dump.reserve_bootvar = memparse(p, &p); + return 0; +} +early_param("fadump_reserve_mem", early_fadump_reserve_mem); + +void crash_fadump(struct pt_regs *regs, const char *str) +{ + unsigned int msecs; + struct fadump_crash_info_header *fdh = NULL; + int old_cpu, this_cpu; + /* Do not include first CPU */ + unsigned int ncpus = num_online_cpus() - 1; + + if (!should_fadump_crash()) + return; + + /* + * old_cpu == -1 means this is the first CPU which has come here, + * go ahead and trigger fadump. + * + * old_cpu != -1 means some other CPU has already on it's way + * to trigger fadump, just keep looping here. + */ + this_cpu = smp_processor_id(); + old_cpu = cmpxchg(&crashing_cpu, -1, this_cpu); + + if (old_cpu != -1) { + atomic_inc(&cpus_in_fadump); + + /* + * We can't loop here indefinitely. Wait as long as fadump + * is in force. If we race with fadump un-registration this + * loop will break and then we go down to normal panic path + * and reboot. If fadump is in force the first crashing + * cpu will definitely trigger fadump. + */ + while (fw_dump.dump_registered) + cpu_relax(); + return; + } + + fdh = __va(fw_dump.fadumphdr_addr); + fdh->crashing_cpu = crashing_cpu; + crash_save_vmcoreinfo(); + + if (regs) + fdh->regs = *regs; + else + ppc_save_regs(&fdh->regs); + + fdh->cpu_mask = *cpu_online_mask; + + /* + * If we came in via system reset, wait a while for the secondary + * CPUs to enter. + */ + if (TRAP(&(fdh->regs)) == INTERRUPT_SYSTEM_RESET) { + msecs = CRASH_TIMEOUT; + while ((atomic_read(&cpus_in_fadump) < ncpus) && (--msecs > 0)) + mdelay(1); + } + + fw_dump.ops->fadump_trigger(fdh, str); +} + +u32 *__init fadump_regs_to_elf_notes(u32 *buf, struct pt_regs *regs) +{ + struct elf_prstatus prstatus; + + memset(&prstatus, 0, sizeof(prstatus)); + /* + * FIXME: How do i get PID? Do I really need it? + * prstatus.pr_pid = ???? + */ + elf_core_copy_regs(&prstatus.pr_reg, regs); + buf = append_elf_note(buf, CRASH_CORE_NOTE_NAME, NT_PRSTATUS, + &prstatus, sizeof(prstatus)); + return buf; +} + +void __init fadump_update_elfcore_header(char *bufp) +{ + struct elf_phdr *phdr; + + bufp += sizeof(struct elfhdr); + + /* First note is a place holder for cpu notes info. */ + phdr = (struct elf_phdr *)bufp; + + if (phdr->p_type == PT_NOTE) { + phdr->p_paddr = __pa(fw_dump.cpu_notes_buf_vaddr); + phdr->p_offset = phdr->p_paddr; + phdr->p_filesz = fw_dump.cpu_notes_buf_size; + phdr->p_memsz = fw_dump.cpu_notes_buf_size; + } + return; +} + +static void *__init fadump_alloc_buffer(unsigned long size) +{ + unsigned long count, i; + struct page *page; + void *vaddr; + + vaddr = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO); + if (!vaddr) + return NULL; + + count = PAGE_ALIGN(size) / PAGE_SIZE; + page = virt_to_page(vaddr); + for (i = 0; i < count; i++) + mark_page_reserved(page + i); + return vaddr; +} + +static void fadump_free_buffer(unsigned long vaddr, unsigned long size) +{ + free_reserved_area((void *)vaddr, (void *)(vaddr + size), -1, NULL); +} + +s32 __init fadump_setup_cpu_notes_buf(u32 num_cpus) +{ + /* Allocate buffer to hold cpu crash notes. */ + fw_dump.cpu_notes_buf_size = num_cpus * sizeof(note_buf_t); + fw_dump.cpu_notes_buf_size = PAGE_ALIGN(fw_dump.cpu_notes_buf_size); + fw_dump.cpu_notes_buf_vaddr = + (unsigned long)fadump_alloc_buffer(fw_dump.cpu_notes_buf_size); + if (!fw_dump.cpu_notes_buf_vaddr) { + pr_err("Failed to allocate %ld bytes for CPU notes buffer\n", + fw_dump.cpu_notes_buf_size); + return -ENOMEM; + } + + pr_debug("Allocated buffer for cpu notes of size %ld at 0x%lx\n", + fw_dump.cpu_notes_buf_size, + fw_dump.cpu_notes_buf_vaddr); + return 0; +} + +void fadump_free_cpu_notes_buf(void) +{ + if (!fw_dump.cpu_notes_buf_vaddr) + return; + + fadump_free_buffer(fw_dump.cpu_notes_buf_vaddr, + fw_dump.cpu_notes_buf_size); + fw_dump.cpu_notes_buf_vaddr = 0; + fw_dump.cpu_notes_buf_size = 0; +} + +static void fadump_free_mem_ranges(struct fadump_mrange_info *mrange_info) +{ + if (mrange_info->is_static) { + mrange_info->mem_range_cnt = 0; + return; + } + + kfree(mrange_info->mem_ranges); + memset((void *)((u64)mrange_info + RNG_NAME_SZ), 0, + (sizeof(struct fadump_mrange_info) - RNG_NAME_SZ)); +} + +/* + * Allocate or reallocate mem_ranges array in incremental units + * of PAGE_SIZE. + */ +static int fadump_alloc_mem_ranges(struct fadump_mrange_info *mrange_info) +{ + struct fadump_memory_range *new_array; + u64 new_size; + + new_size = mrange_info->mem_ranges_sz + PAGE_SIZE; + pr_debug("Allocating %llu bytes of memory for %s memory ranges\n", + new_size, mrange_info->name); + + new_array = krealloc(mrange_info->mem_ranges, new_size, GFP_KERNEL); + if (new_array == NULL) { + pr_err("Insufficient memory for setting up %s memory ranges\n", + mrange_info->name); + fadump_free_mem_ranges(mrange_info); + return -ENOMEM; + } + + mrange_info->mem_ranges = new_array; + mrange_info->mem_ranges_sz = new_size; + mrange_info->max_mem_ranges = (new_size / + sizeof(struct fadump_memory_range)); + return 0; +} +static inline int fadump_add_mem_range(struct fadump_mrange_info *mrange_info, + u64 base, u64 end) +{ + struct fadump_memory_range *mem_ranges = mrange_info->mem_ranges; + bool is_adjacent = false; + u64 start, size; + + if (base == end) + return 0; + + /* + * Fold adjacent memory ranges to bring down the memory ranges/ + * PT_LOAD segments count. + */ + if (mrange_info->mem_range_cnt) { + start = mem_ranges[mrange_info->mem_range_cnt - 1].base; + size = mem_ranges[mrange_info->mem_range_cnt - 1].size; + + /* + * Boot memory area needs separate PT_LOAD segment(s) as it + * is moved to a different location at the time of crash. + * So, fold only if the region is not boot memory area. + */ + if ((start + size) == base && start >= fw_dump.boot_mem_top) + is_adjacent = true; + } + if (!is_adjacent) { + /* resize the array on reaching the limit */ + if (mrange_info->mem_range_cnt == mrange_info->max_mem_ranges) { + int ret; + + if (mrange_info->is_static) { + pr_err("Reached array size limit for %s memory ranges\n", + mrange_info->name); + return -ENOSPC; + } + + ret = fadump_alloc_mem_ranges(mrange_info); + if (ret) + return ret; + + /* Update to the new resized array */ + mem_ranges = mrange_info->mem_ranges; + } + + start = base; + mem_ranges[mrange_info->mem_range_cnt].base = start; + mrange_info->mem_range_cnt++; + } + + mem_ranges[mrange_info->mem_range_cnt - 1].size = (end - start); + pr_debug("%s_memory_range[%d] [%#016llx-%#016llx], %#llx bytes\n", + mrange_info->name, (mrange_info->mem_range_cnt - 1), + start, end - 1, (end - start)); + return 0; +} + +static int fadump_exclude_reserved_area(u64 start, u64 end) +{ + u64 ra_start, ra_end; + int ret = 0; + + ra_start = fw_dump.reserve_dump_area_start; + ra_end = ra_start + fw_dump.reserve_dump_area_size; + + if ((ra_start < end) && (ra_end > start)) { + if ((start < ra_start) && (end > ra_end)) { + ret = fadump_add_mem_range(&crash_mrange_info, + start, ra_start); + if (ret) + return ret; + + ret = fadump_add_mem_range(&crash_mrange_info, + ra_end, end); + } else if (start < ra_start) { + ret = fadump_add_mem_range(&crash_mrange_info, + start, ra_start); + } else if (ra_end < end) { + ret = fadump_add_mem_range(&crash_mrange_info, + ra_end, end); + } + } else + ret = fadump_add_mem_range(&crash_mrange_info, start, end); + + return ret; +} + +static int fadump_init_elfcore_header(char *bufp) +{ + struct elfhdr *elf; + + elf = (struct elfhdr *) bufp; + bufp += sizeof(struct elfhdr); + memcpy(elf->e_ident, ELFMAG, SELFMAG); + elf->e_ident[EI_CLASS] = ELF_CLASS; + elf->e_ident[EI_DATA] = ELF_DATA; + elf->e_ident[EI_VERSION] = EV_CURRENT; + elf->e_ident[EI_OSABI] = ELF_OSABI; + memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); + elf->e_type = ET_CORE; + elf->e_machine = ELF_ARCH; + elf->e_version = EV_CURRENT; + elf->e_entry = 0; + elf->e_phoff = sizeof(struct elfhdr); + elf->e_shoff = 0; + + if (IS_ENABLED(CONFIG_PPC64_ELF_ABI_V2)) + elf->e_flags = 2; + else if (IS_ENABLED(CONFIG_PPC64_ELF_ABI_V1)) + elf->e_flags = 1; + else + elf->e_flags = 0; + + elf->e_ehsize = sizeof(struct elfhdr); + elf->e_phentsize = sizeof(struct elf_phdr); + elf->e_phnum = 0; + elf->e_shentsize = 0; + elf->e_shnum = 0; + elf->e_shstrndx = 0; + + return 0; +} + +/* + * Traverse through memblock structure and setup crash memory ranges. These + * ranges will be used create PT_LOAD program headers in elfcore header. + */ +static int fadump_setup_crash_memory_ranges(void) +{ + u64 i, start, end; + int ret; + + pr_debug("Setup crash memory ranges.\n"); + crash_mrange_info.mem_range_cnt = 0; + + /* + * Boot memory region(s) registered with firmware are moved to + * different location at the time of crash. Create separate program + * header(s) for this memory chunk(s) with the correct offset. + */ + for (i = 0; i < fw_dump.boot_mem_regs_cnt; i++) { + start = fw_dump.boot_mem_addr[i]; + end = start + fw_dump.boot_mem_sz[i]; + ret = fadump_add_mem_range(&crash_mrange_info, start, end); + if (ret) + return ret; + } + + for_each_mem_range(i, &start, &end) { + /* + * skip the memory chunk that is already added + * (0 through boot_memory_top). + */ + if (start < fw_dump.boot_mem_top) { + if (end > fw_dump.boot_mem_top) + start = fw_dump.boot_mem_top; + else + continue; + } + + /* add this range excluding the reserved dump area. */ + ret = fadump_exclude_reserved_area(start, end); + if (ret) + return ret; + } + + return 0; +} + +/* + * If the given physical address falls within the boot memory region then + * return the relocated address that points to the dump region reserved + * for saving initial boot memory contents. + */ +static inline unsigned long fadump_relocate(unsigned long paddr) +{ + unsigned long raddr, rstart, rend, rlast, hole_size; + int i; + + hole_size = 0; + rlast = 0; + raddr = paddr; + for (i = 0; i < fw_dump.boot_mem_regs_cnt; i++) { + rstart = fw_dump.boot_mem_addr[i]; + rend = rstart + fw_dump.boot_mem_sz[i]; + hole_size += (rstart - rlast); + + if (paddr >= rstart && paddr < rend) { + raddr += fw_dump.boot_mem_dest_addr - hole_size; + break; + } + + rlast = rend; + } + + pr_debug("vmcoreinfo: paddr = 0x%lx, raddr = 0x%lx\n", paddr, raddr); + return raddr; +} + +static int fadump_create_elfcore_headers(char *bufp) +{ + unsigned long long raddr, offset; + struct elf_phdr *phdr; + struct elfhdr *elf; + int i, j; + + fadump_init_elfcore_header(bufp); + elf = (struct elfhdr *)bufp; + bufp += sizeof(struct elfhdr); + + /* + * setup ELF PT_NOTE, place holder for cpu notes info. The notes info + * will be populated during second kernel boot after crash. Hence + * this PT_NOTE will always be the first elf note. + * + * NOTE: Any new ELF note addition should be placed after this note. + */ + phdr = (struct elf_phdr *)bufp; + bufp += sizeof(struct elf_phdr); + phdr->p_type = PT_NOTE; + phdr->p_flags = 0; + phdr->p_vaddr = 0; + phdr->p_align = 0; + + phdr->p_offset = 0; + phdr->p_paddr = 0; + phdr->p_filesz = 0; + phdr->p_memsz = 0; + + (elf->e_phnum)++; + + /* setup ELF PT_NOTE for vmcoreinfo */ + phdr = (struct elf_phdr *)bufp; + bufp += sizeof(struct elf_phdr); + phdr->p_type = PT_NOTE; + phdr->p_flags = 0; + phdr->p_vaddr = 0; + phdr->p_align = 0; + + phdr->p_paddr = fadump_relocate(paddr_vmcoreinfo_note()); + phdr->p_offset = phdr->p_paddr; + phdr->p_memsz = phdr->p_filesz = VMCOREINFO_NOTE_SIZE; + + /* Increment number of program headers. */ + (elf->e_phnum)++; + + /* setup PT_LOAD sections. */ + j = 0; + offset = 0; + raddr = fw_dump.boot_mem_addr[0]; + for (i = 0; i < crash_mrange_info.mem_range_cnt; i++) { + u64 mbase, msize; + + mbase = crash_mrange_info.mem_ranges[i].base; + msize = crash_mrange_info.mem_ranges[i].size; + if (!msize) + continue; + + phdr = (struct elf_phdr *)bufp; + bufp += sizeof(struct elf_phdr); + phdr->p_type = PT_LOAD; + phdr->p_flags = PF_R|PF_W|PF_X; + phdr->p_offset = mbase; + + if (mbase == raddr) { + /* + * The entire real memory region will be moved by + * firmware to the specified destination_address. + * Hence set the correct offset. + */ + phdr->p_offset = fw_dump.boot_mem_dest_addr + offset; + if (j < (fw_dump.boot_mem_regs_cnt - 1)) { + offset += fw_dump.boot_mem_sz[j]; + raddr = fw_dump.boot_mem_addr[++j]; + } + } + + phdr->p_paddr = mbase; + phdr->p_vaddr = (unsigned long)__va(mbase); + phdr->p_filesz = msize; + phdr->p_memsz = msize; + phdr->p_align = 0; + + /* Increment number of program headers. */ + (elf->e_phnum)++; + } + return 0; +} + +static unsigned long init_fadump_header(unsigned long addr) +{ + struct fadump_crash_info_header *fdh; + + if (!addr) + return 0; + + fdh = __va(addr); + addr += sizeof(struct fadump_crash_info_header); + + memset(fdh, 0, sizeof(struct fadump_crash_info_header)); + fdh->magic_number = FADUMP_CRASH_INFO_MAGIC; + fdh->elfcorehdr_addr = addr; + /* We will set the crashing cpu id in crash_fadump() during crash. */ + fdh->crashing_cpu = FADUMP_CPU_UNKNOWN; + /* + * When LPAR is terminated by PYHP, ensure all possible CPUs' + * register data is processed while exporting the vmcore. + */ + fdh->cpu_mask = *cpu_possible_mask; + + return addr; +} + +static int register_fadump(void) +{ + unsigned long addr; + void *vaddr; + int ret; + + /* + * If no memory is reserved then we can not register for firmware- + * assisted dump. + */ + if (!fw_dump.reserve_dump_area_size) + return -ENODEV; + + ret = fadump_setup_crash_memory_ranges(); + if (ret) + return ret; + + addr = fw_dump.fadumphdr_addr; + + /* Initialize fadump crash info header. */ + addr = init_fadump_header(addr); + vaddr = __va(addr); + + pr_debug("Creating ELF core headers at %#016lx\n", addr); + fadump_create_elfcore_headers(vaddr); + + /* register the future kernel dump with firmware. */ + pr_debug("Registering for firmware-assisted kernel dump...\n"); + return fw_dump.ops->fadump_register(&fw_dump); +} + +void fadump_cleanup(void) +{ + if (!fw_dump.fadump_supported) + return; + + /* Invalidate the registration only if dump is active. */ + if (fw_dump.dump_active) { + pr_debug("Invalidating firmware-assisted dump registration\n"); + fw_dump.ops->fadump_invalidate(&fw_dump); + } else if (fw_dump.dump_registered) { + /* Un-register Firmware-assisted dump if it was registered. */ + fw_dump.ops->fadump_unregister(&fw_dump); + fadump_free_mem_ranges(&crash_mrange_info); + } + + if (fw_dump.ops->fadump_cleanup) + fw_dump.ops->fadump_cleanup(&fw_dump); +} + +static void fadump_free_reserved_memory(unsigned long start_pfn, + unsigned long end_pfn) +{ + unsigned long pfn; + unsigned long time_limit = jiffies + HZ; + + pr_info("freeing reserved memory (0x%llx - 0x%llx)\n", + PFN_PHYS(start_pfn), PFN_PHYS(end_pfn)); + + for (pfn = start_pfn; pfn < end_pfn; pfn++) { + free_reserved_page(pfn_to_page(pfn)); + + if (time_after(jiffies, time_limit)) { + cond_resched(); + time_limit = jiffies + HZ; + } + } +} + +/* + * Skip memory holes and free memory that was actually reserved. + */ +static void fadump_release_reserved_area(u64 start, u64 end) +{ + unsigned long reg_spfn, reg_epfn; + u64 tstart, tend, spfn, epfn; + int i; + + spfn = PHYS_PFN(start); + epfn = PHYS_PFN(end); + + for_each_mem_pfn_range(i, MAX_NUMNODES, ®_spfn, ®_epfn, NULL) { + tstart = max_t(u64, spfn, reg_spfn); + tend = min_t(u64, epfn, reg_epfn); + + if (tstart < tend) { + fadump_free_reserved_memory(tstart, tend); + + if (tend == epfn) + break; + + spfn = tend; + } + } +} + +/* + * Sort the mem ranges in-place and merge adjacent ranges + * to minimize the memory ranges count. + */ +static void sort_and_merge_mem_ranges(struct fadump_mrange_info *mrange_info) +{ + struct fadump_memory_range *mem_ranges; + u64 base, size; + int i, j, idx; + + if (!reserved_mrange_info.mem_range_cnt) + return; + + /* Sort the memory ranges */ + mem_ranges = mrange_info->mem_ranges; + for (i = 0; i < mrange_info->mem_range_cnt; i++) { + idx = i; + for (j = (i + 1); j < mrange_info->mem_range_cnt; j++) { + if (mem_ranges[idx].base > mem_ranges[j].base) + idx = j; + } + if (idx != i) + swap(mem_ranges[idx], mem_ranges[i]); + } + + /* Merge adjacent reserved ranges */ + idx = 0; + for (i = 1; i < mrange_info->mem_range_cnt; i++) { + base = mem_ranges[i-1].base; + size = mem_ranges[i-1].size; + if (mem_ranges[i].base == (base + size)) + mem_ranges[idx].size += mem_ranges[i].size; + else { + idx++; + if (i == idx) + continue; + + mem_ranges[idx] = mem_ranges[i]; + } + } + mrange_info->mem_range_cnt = idx + 1; +} + +/* + * Scan reserved-ranges to consider them while reserving/releasing + * memory for FADump. + */ +static void __init early_init_dt_scan_reserved_ranges(unsigned long node) +{ + const __be32 *prop; + int len, ret = -1; + unsigned long i; + + /* reserved-ranges already scanned */ + if (reserved_mrange_info.mem_range_cnt != 0) + return; + + prop = of_get_flat_dt_prop(node, "reserved-ranges", &len); + if (!prop) + return; + + /* + * Each reserved range is an (address,size) pair, 2 cells each, + * totalling 4 cells per range. + */ + for (i = 0; i < len / (sizeof(*prop) * 4); i++) { + u64 base, size; + + base = of_read_number(prop + (i * 4) + 0, 2); + size = of_read_number(prop + (i * 4) + 2, 2); + + if (size) { + ret = fadump_add_mem_range(&reserved_mrange_info, + base, base + size); + if (ret < 0) { + pr_warn("some reserved ranges are ignored!\n"); + break; + } + } + } + + /* Compact reserved ranges */ + sort_and_merge_mem_ranges(&reserved_mrange_info); +} + +/* + * Release the memory that was reserved during early boot to preserve the + * crash'ed kernel's memory contents except reserved dump area (permanent + * reservation) and reserved ranges used by F/W. The released memory will + * be available for general use. + */ +static void fadump_release_memory(u64 begin, u64 end) +{ + u64 ra_start, ra_end, tstart; + int i, ret; + + ra_start = fw_dump.reserve_dump_area_start; + ra_end = ra_start + fw_dump.reserve_dump_area_size; + + /* + * If reserved ranges array limit is hit, overwrite the last reserved + * memory range with reserved dump area to ensure it is excluded from + * the memory being released (reused for next FADump registration). + */ + if (reserved_mrange_info.mem_range_cnt == + reserved_mrange_info.max_mem_ranges) + reserved_mrange_info.mem_range_cnt--; + + ret = fadump_add_mem_range(&reserved_mrange_info, ra_start, ra_end); + if (ret != 0) + return; + + /* Get the reserved ranges list in order first. */ + sort_and_merge_mem_ranges(&reserved_mrange_info); + + /* Exclude reserved ranges and release remaining memory */ + tstart = begin; + for (i = 0; i < reserved_mrange_info.mem_range_cnt; i++) { + ra_start = reserved_mrange_info.mem_ranges[i].base; + ra_end = ra_start + reserved_mrange_info.mem_ranges[i].size; + + if (tstart >= ra_end) + continue; + + if (tstart < ra_start) + fadump_release_reserved_area(tstart, ra_start); + tstart = ra_end; + } + + if (tstart < end) + fadump_release_reserved_area(tstart, end); +} + +static void fadump_invalidate_release_mem(void) +{ + mutex_lock(&fadump_mutex); + if (!fw_dump.dump_active) { + mutex_unlock(&fadump_mutex); + return; + } + + fadump_cleanup(); + mutex_unlock(&fadump_mutex); + + fadump_release_memory(fw_dump.boot_mem_top, memblock_end_of_DRAM()); + fadump_free_cpu_notes_buf(); + + /* + * Setup kernel metadata and initialize the kernel dump + * memory structure for FADump re-registration. + */ + if (fw_dump.ops->fadump_setup_metadata && + (fw_dump.ops->fadump_setup_metadata(&fw_dump) < 0)) + pr_warn("Failed to setup kernel metadata!\n"); + fw_dump.ops->fadump_init_mem_struct(&fw_dump); +} + +static ssize_t release_mem_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + int input = -1; + + if (!fw_dump.dump_active) + return -EPERM; + + if (kstrtoint(buf, 0, &input)) + return -EINVAL; + + if (input == 1) { + /* + * Take away the '/proc/vmcore'. We are releasing the dump + * memory, hence it will not be valid anymore. + */ +#ifdef CONFIG_PROC_VMCORE + vmcore_cleanup(); +#endif + fadump_invalidate_release_mem(); + + } else + return -EINVAL; + return count; +} + +/* Release the reserved memory and disable the FADump */ +static void __init unregister_fadump(void) +{ + fadump_cleanup(); + fadump_release_memory(fw_dump.reserve_dump_area_start, + fw_dump.reserve_dump_area_size); + fw_dump.fadump_enabled = 0; + kobject_put(fadump_kobj); +} + +static ssize_t enabled_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sprintf(buf, "%d\n", fw_dump.fadump_enabled); +} + +static ssize_t mem_reserved_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sprintf(buf, "%ld\n", fw_dump.reserve_dump_area_size); +} + +static ssize_t registered_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sprintf(buf, "%d\n", fw_dump.dump_registered); +} + +static ssize_t registered_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + int ret = 0; + int input = -1; + + if (!fw_dump.fadump_enabled || fw_dump.dump_active) + return -EPERM; + + if (kstrtoint(buf, 0, &input)) + return -EINVAL; + + mutex_lock(&fadump_mutex); + + switch (input) { + case 0: + if (fw_dump.dump_registered == 0) { + goto unlock_out; + } + + /* Un-register Firmware-assisted dump */ + pr_debug("Un-register firmware-assisted dump\n"); + fw_dump.ops->fadump_unregister(&fw_dump); + break; + case 1: + if (fw_dump.dump_registered == 1) { + /* Un-register Firmware-assisted dump */ + fw_dump.ops->fadump_unregister(&fw_dump); + } + /* Register Firmware-assisted dump */ + ret = register_fadump(); + break; + default: + ret = -EINVAL; + break; + } + +unlock_out: + mutex_unlock(&fadump_mutex); + return ret < 0 ? ret : count; +} + +static int fadump_region_show(struct seq_file *m, void *private) +{ + if (!fw_dump.fadump_enabled) + return 0; + + mutex_lock(&fadump_mutex); + fw_dump.ops->fadump_region_show(&fw_dump, m); + mutex_unlock(&fadump_mutex); + return 0; +} + +static struct kobj_attribute release_attr = __ATTR_WO(release_mem); +static struct kobj_attribute enable_attr = __ATTR_RO(enabled); +static struct kobj_attribute register_attr = __ATTR_RW(registered); +static struct kobj_attribute mem_reserved_attr = __ATTR_RO(mem_reserved); + +static struct attribute *fadump_attrs[] = { + &enable_attr.attr, + ®ister_attr.attr, + &mem_reserved_attr.attr, + NULL, +}; + +ATTRIBUTE_GROUPS(fadump); + +DEFINE_SHOW_ATTRIBUTE(fadump_region); + +static void __init fadump_init_files(void) +{ + int rc = 0; + + fadump_kobj = kobject_create_and_add("fadump", kernel_kobj); + if (!fadump_kobj) { + pr_err("failed to create fadump kobject\n"); + return; + } + + debugfs_create_file("fadump_region", 0444, arch_debugfs_dir, NULL, + &fadump_region_fops); + + if (fw_dump.dump_active) { + rc = sysfs_create_file(fadump_kobj, &release_attr.attr); + if (rc) + pr_err("unable to create release_mem sysfs file (%d)\n", + rc); + } + + rc = sysfs_create_groups(fadump_kobj, fadump_groups); + if (rc) { + pr_err("sysfs group creation failed (%d), unregistering FADump", + rc); + unregister_fadump(); + return; + } + + /* + * The FADump sysfs are moved from kernel_kobj to fadump_kobj need to + * create symlink at old location to maintain backward compatibility. + * + * - fadump_enabled -> fadump/enabled + * - fadump_registered -> fadump/registered + * - fadump_release_mem -> fadump/release_mem + */ + rc = compat_only_sysfs_link_entry_to_kobj(kernel_kobj, fadump_kobj, + "enabled", "fadump_enabled"); + if (rc) { + pr_err("unable to create fadump_enabled symlink (%d)", rc); + return; + } + + rc = compat_only_sysfs_link_entry_to_kobj(kernel_kobj, fadump_kobj, + "registered", + "fadump_registered"); + if (rc) { + pr_err("unable to create fadump_registered symlink (%d)", rc); + sysfs_remove_link(kernel_kobj, "fadump_enabled"); + return; + } + + if (fw_dump.dump_active) { + rc = compat_only_sysfs_link_entry_to_kobj(kernel_kobj, + fadump_kobj, + "release_mem", + "fadump_release_mem"); + if (rc) + pr_err("unable to create fadump_release_mem symlink (%d)", + rc); + } + return; +} + +/* + * Prepare for firmware-assisted dump. + */ +int __init setup_fadump(void) +{ + if (!fw_dump.fadump_supported) + return 0; + + fadump_init_files(); + fadump_show_config(); + + if (!fw_dump.fadump_enabled) + return 1; + + /* + * If dump data is available then see if it is valid and prepare for + * saving it to the disk. + */ + if (fw_dump.dump_active) { + /* + * if dump process fails then invalidate the registration + * and release memory before proceeding for re-registration. + */ + if (fw_dump.ops->fadump_process(&fw_dump) < 0) + fadump_invalidate_release_mem(); + } + /* Initialize the kernel dump memory structure and register with f/w */ + else if (fw_dump.reserve_dump_area_size) { + fw_dump.ops->fadump_init_mem_struct(&fw_dump); + register_fadump(); + } + + /* + * In case of panic, fadump is triggered via ppc_panic_event() + * panic notifier. Setting crash_kexec_post_notifiers to 'true' + * lets panic() function take crash friendly path before panic + * notifiers are invoked. + */ + crash_kexec_post_notifiers = true; + + return 1; +} +/* + * Use subsys_initcall_sync() here because there is dependency with + * crash_save_vmcoreinfo_init(), which must run first to ensure vmcoreinfo initialization + * is done before registering with f/w. + */ +subsys_initcall_sync(setup_fadump); +#else /* !CONFIG_PRESERVE_FA_DUMP */ + +/* Scan the Firmware Assisted dump configuration details. */ +int __init early_init_dt_scan_fw_dump(unsigned long node, const char *uname, + int depth, void *data) +{ + if ((depth != 1) || (strcmp(uname, "ibm,opal") != 0)) + return 0; + + opal_fadump_dt_scan(&fw_dump, node); + return 1; +} + +/* + * When dump is active but PRESERVE_FA_DUMP is enabled on the kernel, + * preserve crash data. The subsequent memory preserving kernel boot + * is likely to process this crash data. + */ +int __init fadump_reserve_mem(void) +{ + if (fw_dump.dump_active) { + /* + * If last boot has crashed then reserve all the memory + * above boot memory to preserve crash data. + */ + pr_info("Preserving crash data for processing in next boot.\n"); + fadump_reserve_crash_area(fw_dump.boot_mem_top); + } else + pr_debug("FADump-aware kernel..\n"); + + return 1; +} +#endif /* CONFIG_PRESERVE_FA_DUMP */ + +/* Preserve everything above the base address */ +static void __init fadump_reserve_crash_area(u64 base) +{ + u64 i, mstart, mend, msize; + + for_each_mem_range(i, &mstart, &mend) { + msize = mend - mstart; + + if ((mstart + msize) < base) + continue; + + if (mstart < base) { + msize -= (base - mstart); + mstart = base; + } + + pr_info("Reserving %lluMB of memory at %#016llx for preserving crash data", + (msize >> 20), mstart); + memblock_reserve(mstart, msize); + } +} + +unsigned long __init arch_reserved_kernel_pages(void) +{ + return memblock_reserved_size() / PAGE_SIZE; +} diff --git a/arch/powerpc/kernel/firmware.c b/arch/powerpc/kernel/firmware.c new file mode 100644 index 000000000..20328f72f --- /dev/null +++ b/arch/powerpc/kernel/firmware.c @@ -0,0 +1,41 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Extracted from cputable.c + * + * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org) + * + * Modifications for ppc64: + * Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com> + * Copyright (C) 2005 Stephen Rothwell, IBM Corporation + */ + +#include <linux/export.h> +#include <linux/cache.h> +#include <linux/of.h> + +#include <asm/firmware.h> +#include <asm/kvm_guest.h> + +#ifdef CONFIG_PPC64 +unsigned long powerpc_firmware_features __read_mostly; +EXPORT_SYMBOL_GPL(powerpc_firmware_features); +#endif + +#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_KVM_GUEST) +DEFINE_STATIC_KEY_FALSE(kvm_guest); +int __init check_kvm_guest(void) +{ + struct device_node *hyper_node; + + hyper_node = of_find_node_by_path("/hypervisor"); + if (!hyper_node) + return 0; + + if (of_device_is_compatible(hyper_node, "linux,kvm")) + static_branch_enable(&kvm_guest); + + of_node_put(hyper_node); + return 0; +} +core_initcall(check_kvm_guest); // before kvm_guest_init() +#endif diff --git a/arch/powerpc/kernel/fpu.S b/arch/powerpc/kernel/fpu.S new file mode 100644 index 000000000..9854364e5 --- /dev/null +++ b/arch/powerpc/kernel/fpu.S @@ -0,0 +1,154 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * FPU support code, moved here from head.S so that it can be used + * by chips which use other head-whatever.S files. + * + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> + * Copyright (C) 1996 Paul Mackerras. + * Copyright (C) 1997 Dan Malek (dmalek@jlc.net). + */ + +#include <asm/reg.h> +#include <asm/page.h> +#include <asm/mmu.h> +#include <asm/cputable.h> +#include <asm/cache.h> +#include <asm/thread_info.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/ptrace.h> +#include <asm/export.h> +#include <asm/asm-compat.h> +#include <asm/feature-fixups.h> + +#ifdef CONFIG_VSX +#define __REST_1FPVSR(n,c,base) \ +BEGIN_FTR_SECTION \ + b 2f; \ +END_FTR_SECTION_IFSET(CPU_FTR_VSX); \ + REST_FPR(n,base); \ + b 3f; \ +2: REST_VSR(n,c,base); \ +3: + +#define __REST_32FPVSRS(n,c,base) \ +BEGIN_FTR_SECTION \ + b 2f; \ +END_FTR_SECTION_IFSET(CPU_FTR_VSX); \ + REST_32FPRS(n,base); \ + b 3f; \ +2: REST_32VSRS(n,c,base); \ +3: + +#define __SAVE_32FPVSRS(n,c,base) \ +BEGIN_FTR_SECTION \ + b 2f; \ +END_FTR_SECTION_IFSET(CPU_FTR_VSX); \ + SAVE_32FPRS(n,base); \ + b 3f; \ +2: SAVE_32VSRS(n,c,base); \ +3: +#else +#define __REST_1FPVSR(n,b,base) REST_FPR(n, base) +#define __REST_32FPVSRS(n,b,base) REST_32FPRS(n, base) +#define __SAVE_32FPVSRS(n,b,base) SAVE_32FPRS(n, base) +#endif +#define REST_1FPVSR(n,c,base) __REST_1FPVSR(n,__REG_##c,__REG_##base) +#define REST_32FPVSRS(n,c,base) __REST_32FPVSRS(n,__REG_##c,__REG_##base) +#define SAVE_32FPVSRS(n,c,base) __SAVE_32FPVSRS(n,__REG_##c,__REG_##base) + +/* + * Load state from memory into FP registers including FPSCR. + * Assumes the caller has enabled FP in the MSR. + */ +_GLOBAL(load_fp_state) + lfd fr0,FPSTATE_FPSCR(r3) + MTFSF_L(fr0) + REST_32FPVSRS(0, R4, R3) + blr +EXPORT_SYMBOL(load_fp_state) +_ASM_NOKPROBE_SYMBOL(load_fp_state); /* used by restore_math */ + +/* + * Store FP state into memory, including FPSCR + * Assumes the caller has enabled FP in the MSR. + */ +_GLOBAL(store_fp_state) + SAVE_32FPVSRS(0, R4, R3) + mffs fr0 + stfd fr0,FPSTATE_FPSCR(r3) + REST_1FPVSR(0, R4, R3) + blr +EXPORT_SYMBOL(store_fp_state) + +/* + * This task wants to use the FPU now. + * On UP, disable FP for the task which had the FPU previously, + * and save its floating-point registers in its thread_struct. + * Load up this task's FP registers from its thread_struct, + * enable the FPU for the current task and return to the task. + * Note that on 32-bit this can only use registers that will be + * restored by fast_exception_return, i.e. r3 - r6, r10 and r11. + */ +_GLOBAL(load_up_fpu) + mfmsr r5 +#ifdef CONFIG_PPC_BOOK3S_64 + /* interrupt doesn't set MSR[RI] and HPT can fault on current access */ + ori r5,r5,MSR_FP|MSR_RI +#else + ori r5,r5,MSR_FP +#endif +#ifdef CONFIG_VSX +BEGIN_FTR_SECTION + oris r5,r5,MSR_VSX@h +END_FTR_SECTION_IFSET(CPU_FTR_VSX) +#endif + MTMSRD(r5) /* enable use of fpu now */ + isync + /* enable use of FP after return */ +#ifdef CONFIG_PPC32 + addi r5,r2,THREAD + lwz r4,THREAD_FPEXC_MODE(r5) + ori r9,r9,MSR_FP /* enable FP for current */ + or r9,r9,r4 +#else + ld r4,PACACURRENT(r13) + addi r5,r4,THREAD /* Get THREAD */ + lwz r4,THREAD_FPEXC_MODE(r5) + ori r12,r12,MSR_FP + or r12,r12,r4 + std r12,_MSR(r1) +#ifdef CONFIG_PPC_BOOK3S_64 + li r4,0 + stb r4,PACASRR_VALID(r13) +#endif +#endif + li r4,1 + stb r4,THREAD_LOAD_FP(r5) + addi r10,r5,THREAD_FPSTATE + lfd fr0,FPSTATE_FPSCR(r10) + MTFSF_L(fr0) + REST_32FPVSRS(0, R4, R10) + /* restore registers and return */ + /* we haven't used ctr or xer or lr */ + blr +_ASM_NOKPROBE_SYMBOL(load_up_fpu) + +/* + * save_fpu(tsk) + * Save the floating-point registers in its thread_struct. + * Enables the FPU for use in the kernel on return. + */ +_GLOBAL(save_fpu) + addi r3,r3,THREAD /* want THREAD of task */ + PPC_LL r6,THREAD_FPSAVEAREA(r3) + PPC_LL r5,PT_REGS(r3) + PPC_LCMPI 0,r6,0 + bne 2f + addi r6,r3,THREAD_FPSTATE +2: SAVE_32FPVSRS(0, R4, R6) + mffs fr0 + stfd fr0,FPSTATE_FPSCR(r6) + REST_1FPVSR(0, R4, R6) + blr diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h new file mode 100644 index 000000000..c3286260a --- /dev/null +++ b/arch/powerpc/kernel/head_32.h @@ -0,0 +1,222 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __HEAD_32_H__ +#define __HEAD_32_H__ + +#include <asm/ptrace.h> /* for STACK_FRAME_REGS_MARKER */ + +/* + * Exception entry code. This code runs with address translation + * turned off, i.e. using physical addresses. + * We assume sprg3 has the physical address of the current + * task's thread_struct. + */ +.macro EXCEPTION_PROLOG trapno name handle_dar_dsisr=0 + EXCEPTION_PROLOG_0 handle_dar_dsisr=\handle_dar_dsisr + EXCEPTION_PROLOG_1 + EXCEPTION_PROLOG_2 \trapno \name handle_dar_dsisr=\handle_dar_dsisr +.endm + +.macro EXCEPTION_PROLOG_0 handle_dar_dsisr=0 + mtspr SPRN_SPRG_SCRATCH0,r10 + mtspr SPRN_SPRG_SCRATCH1,r11 + mfspr r10, SPRN_SPRG_THREAD + .if \handle_dar_dsisr +#ifdef CONFIG_40x + mfspr r11, SPRN_DEAR +#else + mfspr r11, SPRN_DAR +#endif + stw r11, DAR(r10) +#ifdef CONFIG_40x + mfspr r11, SPRN_ESR +#else + mfspr r11, SPRN_DSISR +#endif + stw r11, DSISR(r10) + .endif + mfspr r11, SPRN_SRR0 + stw r11, SRR0(r10) + mfspr r11, SPRN_SRR1 /* check whether user or kernel */ + stw r11, SRR1(r10) + mfcr r10 + andi. r11, r11, MSR_PR +.endm + +.macro EXCEPTION_PROLOG_1 + mtspr SPRN_SPRG_SCRATCH2,r1 + subi r1, r1, INT_FRAME_SIZE /* use r1 if kernel */ + beq 1f + mfspr r1,SPRN_SPRG_THREAD + lwz r1,TASK_STACK-THREAD(r1) + addi r1, r1, THREAD_SIZE - INT_FRAME_SIZE +1: +#ifdef CONFIG_VMAP_STACK + mtcrf 0x3f, r1 + bt 32 - THREAD_ALIGN_SHIFT, vmap_stack_overflow +#endif +.endm + +.macro EXCEPTION_PROLOG_2 trapno name handle_dar_dsisr=0 +#ifdef CONFIG_PPC_8xx + .if \handle_dar_dsisr + li r11, RPN_PATTERN + mtspr SPRN_DAR, r11 /* Tag DAR, to be used in DTLB Error */ + .endif +#endif + LOAD_REG_IMMEDIATE(r11, MSR_KERNEL & ~MSR_RI) /* re-enable MMU */ + mtspr SPRN_SRR1, r11 + lis r11, 1f@h + ori r11, r11, 1f@l + mtspr SPRN_SRR0, r11 + mfspr r11, SPRN_SPRG_SCRATCH2 + rfi + + .text +\name\()_virt: +1: + stw r11,GPR1(r1) + stw r11,0(r1) + mr r11, r1 + stw r10,_CCR(r11) /* save registers */ + stw r12,GPR12(r11) + stw r9,GPR9(r11) + mfspr r10,SPRN_SPRG_SCRATCH0 + mfspr r12,SPRN_SPRG_SCRATCH1 + stw r10,GPR10(r11) + stw r12,GPR11(r11) + mflr r10 + stw r10,_LINK(r11) + mfspr r12, SPRN_SPRG_THREAD + tovirt(r12, r12) + .if \handle_dar_dsisr + lwz r10, DAR(r12) + stw r10, _DAR(r11) + lwz r10, DSISR(r12) + stw r10, _DSISR(r11) + .endif + lwz r9, SRR1(r12) + lwz r12, SRR0(r12) +#ifdef CONFIG_40x + rlwinm r9,r9,0,14,12 /* clear MSR_WE (necessary?) */ +#elif defined(CONFIG_PPC_8xx) + mtspr SPRN_EID, r2 /* Set MSR_RI */ +#else + li r10, MSR_KERNEL /* can take exceptions */ + mtmsr r10 /* (except for mach check in rtas) */ +#endif + COMMON_EXCEPTION_PROLOG_END \trapno +_ASM_NOKPROBE_SYMBOL(\name\()_virt) +.endm + +.macro COMMON_EXCEPTION_PROLOG_END trapno + stw r0,GPR0(r1) + lis r10,STACK_FRAME_REGS_MARKER@ha /* exception frame marker */ + addi r10,r10,STACK_FRAME_REGS_MARKER@l + stw r10,8(r1) + li r10, \trapno + stw r10,_TRAP(r1) + SAVE_GPRS(3, 8, r1) + SAVE_NVGPRS(r1) + stw r2,GPR2(r1) + stw r12,_NIP(r1) + stw r9,_MSR(r1) + mfctr r10 + mfspr r2,SPRN_SPRG_THREAD + stw r10,_CTR(r1) + tovirt(r2, r2) + mfspr r10,SPRN_XER + addi r2, r2, -THREAD + stw r10,_XER(r1) + addi r3,r1,STACK_FRAME_OVERHEAD +.endm + +.macro prepare_transfer_to_handler +#ifdef CONFIG_PPC_BOOK3S_32 + andi. r12,r9,MSR_PR + bne 777f + bl prepare_transfer_to_handler +#ifdef CONFIG_PPC_KUEP + b 778f +777: + bl __kuep_lock +778: +#endif +777: +#endif +.endm + +.macro SYSCALL_ENTRY trapno + mfspr r9, SPRN_SRR1 + mfspr r12, SPRN_SRR0 + LOAD_REG_IMMEDIATE(r11, MSR_KERNEL) /* can take exceptions */ + lis r10, 1f@h + ori r10, r10, 1f@l + mtspr SPRN_SRR1, r11 + mtspr SPRN_SRR0, r10 + mfspr r10,SPRN_SPRG_THREAD + mr r11, r1 + lwz r1,TASK_STACK-THREAD(r10) + tovirt(r10, r10) + addi r1, r1, THREAD_SIZE - INT_FRAME_SIZE + rfi +1: + stw r12,_NIP(r1) + mfcr r12 + rlwinm r12,r12,0,4,2 /* Clear SO bit in CR */ + stw r12,_CCR(r1) + b transfer_to_syscall /* jump to handler */ +.endm + +/* + * Note: code which follows this uses cr0.eq (set if from kernel), + * r11, r12 (SRR0), and r9 (SRR1). + * + * Note2: once we have set r1 we are in a position to take exceptions + * again, and we could thus set MSR:RI at that point. + */ + +/* + * Exception vectors. + */ +#ifdef CONFIG_PPC_BOOK3S +#define START_EXCEPTION(n, label) \ + __HEAD; \ + . = n; \ + DO_KVM n; \ +label: + +#else +#define START_EXCEPTION(n, label) \ + __HEAD; \ + . = n; \ +label: + +#endif + +#define EXCEPTION(n, label, hdlr) \ + START_EXCEPTION(n, label) \ + EXCEPTION_PROLOG n label; \ + prepare_transfer_to_handler; \ + bl hdlr; \ + b interrupt_return + +.macro vmap_stack_overflow_exception + __HEAD +vmap_stack_overflow: +#ifdef CONFIG_SMP + mfspr r1, SPRN_SPRG_THREAD + lwz r1, TASK_CPU - THREAD(r1) + slwi r1, r1, 3 + addis r1, r1, emergency_ctx-PAGE_OFFSET@ha +#else + lis r1, emergency_ctx-PAGE_OFFSET@ha +#endif + lwz r1, emergency_ctx-PAGE_OFFSET@l(r1) + addi r1, r1, THREAD_SIZE - INT_FRAME_SIZE + EXCEPTION_PROLOG_2 0 vmap_stack_overflow + prepare_transfer_to_handler + bl stack_overflow_exception + b interrupt_return +.endm + +#endif /* __HEAD_32_H__ */ diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S new file mode 100644 index 000000000..088f50089 --- /dev/null +++ b/arch/powerpc/kernel/head_40x.S @@ -0,0 +1,718 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (c) 1995-1996 Gary Thomas <gdt@linuxppc.org> + * Initial PowerPC version. + * Copyright (c) 1996 Cort Dougan <cort@cs.nmt.edu> + * Rewritten for PReP + * Copyright (c) 1996 Paul Mackerras <paulus@cs.anu.edu.au> + * Low-level exception handers, MMU support, and rewrite. + * Copyright (c) 1997 Dan Malek <dmalek@jlc.net> + * PowerPC 8xx modifications. + * Copyright (c) 1998-1999 TiVo, Inc. + * PowerPC 403GCX modifications. + * Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu> + * PowerPC 403GCX/405GP modifications. + * Copyright 2000 MontaVista Software Inc. + * PPC405 modifications + * PowerPC 403GCX/405GP modifications. + * Author: MontaVista Software, Inc. + * frank_rowand@mvista.com or source@mvista.com + * debbie_chu@mvista.com + * + * Module name: head_4xx.S + * + * Description: + * Kernel execution entry point code. + */ + +#include <linux/init.h> +#include <linux/pgtable.h> +#include <linux/sizes.h> +#include <asm/processor.h> +#include <asm/page.h> +#include <asm/mmu.h> +#include <asm/cputable.h> +#include <asm/thread_info.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/ptrace.h> +#include <asm/export.h> + +#include "head_32.h" + +/* As with the other PowerPC ports, it is expected that when code + * execution begins here, the following registers contain valid, yet + * optional, information: + * + * r3 - Board info structure pointer (DRAM, frequency, MAC address, etc.) + * r4 - Starting address of the init RAM disk + * r5 - Ending address of the init RAM disk + * r6 - Start of kernel command line string (e.g. "mem=96m") + * r7 - End of kernel command line string + * + * This is all going to change RSN when we add bi_recs....... -- Dan + */ + __HEAD +_GLOBAL(_stext); +_GLOBAL(_start); + + mr r31,r3 /* save device tree ptr */ + + /* We have to turn on the MMU right away so we get cache modes + * set correctly. + */ + bl initial_mmu + +/* We now have the lower 16 Meg mapped into TLB entries, and the caches + * ready to work. + */ +turn_on_mmu: + lis r0,MSR_KERNEL@h + ori r0,r0,MSR_KERNEL@l + mtspr SPRN_SRR1,r0 + lis r0,start_here@h + ori r0,r0,start_here@l + mtspr SPRN_SRR0,r0 + rfi /* enables MMU */ + b . /* prevent prefetch past rfi */ + +/* + * This area is used for temporarily saving registers during the + * critical exception prolog. + */ + . = 0xc0 +crit_save: +_GLOBAL(crit_r10) + .space 4 +_GLOBAL(crit_r11) + .space 4 +_GLOBAL(crit_srr0) + .space 4 +_GLOBAL(crit_srr1) + .space 4 +_GLOBAL(crit_r1) + .space 4 +_GLOBAL(crit_dear) + .space 4 +_GLOBAL(crit_esr) + .space 4 + +/* + * Exception prolog for critical exceptions. This is a little different + * from the normal exception prolog above since a critical exception + * can potentially occur at any point during normal exception processing. + * Thus we cannot use the same SPRG registers as the normal prolog above. + * Instead we use a couple of words of memory at low physical addresses. + * This is OK since we don't support SMP on these processors. + */ +.macro CRITICAL_EXCEPTION_PROLOG trapno name + stw r10,crit_r10@l(0) /* save two registers to work with */ + stw r11,crit_r11@l(0) + mfspr r10,SPRN_SRR0 + mfspr r11,SPRN_SRR1 + stw r10,crit_srr0@l(0) + stw r11,crit_srr1@l(0) + mfspr r10,SPRN_DEAR + mfspr r11,SPRN_ESR + stw r10,crit_dear@l(0) + stw r11,crit_esr@l(0) + mfcr r10 /* save CR in r10 for now */ + mfspr r11,SPRN_SRR3 /* check whether user or kernel */ + andi. r11,r11,MSR_PR + lis r11,(critirq_ctx-PAGE_OFFSET)@ha + lwz r11,(critirq_ctx-PAGE_OFFSET)@l(r11) + beq 1f + /* COMING FROM USER MODE */ + mfspr r11,SPRN_SPRG_THREAD /* if from user, start at top of */ + lwz r11,TASK_STACK-THREAD(r11) /* this thread's kernel stack */ +1: stw r1,crit_r1@l(0) + addi r1,r11,THREAD_SIZE-INT_FRAME_SIZE /* Alloc an excpt frm */ + LOAD_REG_IMMEDIATE(r11, MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)) /* re-enable MMU */ + mtspr SPRN_SRR1, r11 + lis r11, 1f@h + ori r11, r11, 1f@l + mtspr SPRN_SRR0, r11 + rfi + + .text +1: +\name\()_virt: + lwz r11,crit_r1@l(0) + stw r11,GPR1(r1) + stw r11,0(r1) + mr r11,r1 + stw r10,_CCR(r11) /* save various registers */ + stw r12,GPR12(r11) + stw r9,GPR9(r11) + mflr r10 + stw r10,_LINK(r11) + lis r9,PAGE_OFFSET@ha + lwz r10,crit_r10@l(r9) + lwz r12,crit_r11@l(r9) + stw r10,GPR10(r11) + stw r12,GPR11(r11) + lwz r12,crit_dear@l(r9) + lwz r9,crit_esr@l(r9) + stw r12,_DEAR(r11) /* since they may have had stuff */ + stw r9,_ESR(r11) /* exception was taken */ + mfspr r12,SPRN_SRR2 + mfspr r9,SPRN_SRR3 + rlwinm r9,r9,0,14,12 /* clear MSR_WE (necessary?) */ + COMMON_EXCEPTION_PROLOG_END \trapno + 2 +_ASM_NOKPROBE_SYMBOL(\name\()_virt) +.endm + + /* + * State at this point: + * r9 saved in stack frame, now saved SRR3 & ~MSR_WE + * r10 saved in crit_r10 and in stack frame, trashed + * r11 saved in crit_r11 and in stack frame, + * now phys stack/exception frame pointer + * r12 saved in stack frame, now saved SRR2 + * CR saved in stack frame, CR0.EQ = !SRR3.PR + * LR, DEAR, ESR in stack frame + * r1 saved in stack frame, now virt stack/excframe pointer + * r0, r3-r8 saved in stack frame + */ + +/* + * Exception vectors. + */ +#define CRITICAL_EXCEPTION(n, label, hdlr) \ + START_EXCEPTION(n, label); \ + CRITICAL_EXCEPTION_PROLOG n label; \ + prepare_transfer_to_handler; \ + bl hdlr; \ + b ret_from_crit_exc + +/* + * 0x0100 - Critical Interrupt Exception + */ + CRITICAL_EXCEPTION(0x0100, CriticalInterrupt, unknown_exception) + +/* + * 0x0200 - Machine Check Exception + */ + CRITICAL_EXCEPTION(0x0200, MachineCheck, machine_check_exception) + +/* + * 0x0300 - Data Storage Exception + * This happens for just a few reasons. U0 set (but we don't do that), + * or zone protection fault (user violation, write to protected page). + * The other Data TLB exceptions bail out to this point + * if they can't resolve the lightweight TLB fault. + */ + START_EXCEPTION(0x0300, DataStorage) + EXCEPTION_PROLOG 0x300 DataStorage handle_dar_dsisr=1 + prepare_transfer_to_handler + bl do_page_fault + b interrupt_return + +/* + * 0x0400 - Instruction Storage Exception + * This is caused by a fetch from non-execute or guarded pages. + */ + START_EXCEPTION(0x0400, InstructionAccess) + EXCEPTION_PROLOG 0x400 InstructionAccess + li r5,0 + stw r5, _ESR(r11) /* Zero ESR */ + stw r12, _DEAR(r11) /* SRR0 as DEAR */ + prepare_transfer_to_handler + bl do_page_fault + b interrupt_return + +/* 0x0500 - External Interrupt Exception */ + EXCEPTION(0x0500, HardwareInterrupt, do_IRQ) + +/* 0x0600 - Alignment Exception */ + START_EXCEPTION(0x0600, Alignment) + EXCEPTION_PROLOG 0x600 Alignment handle_dar_dsisr=1 + prepare_transfer_to_handler + bl alignment_exception + REST_NVGPRS(r1) + b interrupt_return + +/* 0x0700 - Program Exception */ + START_EXCEPTION(0x0700, ProgramCheck) + EXCEPTION_PROLOG 0x700 ProgramCheck handle_dar_dsisr=1 + prepare_transfer_to_handler + bl program_check_exception + REST_NVGPRS(r1) + b interrupt_return + + EXCEPTION(0x0800, Trap_08, unknown_exception) + EXCEPTION(0x0900, Trap_09, unknown_exception) + EXCEPTION(0x0A00, Trap_0A, unknown_exception) + EXCEPTION(0x0B00, Trap_0B, unknown_exception) + +/* 0x0C00 - System Call Exception */ + START_EXCEPTION(0x0C00, SystemCall) + SYSCALL_ENTRY 0xc00 +/* Trap_0D is commented out to get more space for system call exception */ + +/* EXCEPTION(0x0D00, Trap_0D, unknown_exception) */ + EXCEPTION(0x0E00, Trap_0E, unknown_exception) + EXCEPTION(0x0F00, Trap_0F, unknown_exception) + +/* 0x1000 - Programmable Interval Timer (PIT) Exception */ + START_EXCEPTION(0x1000, DecrementerTrap) + b Decrementer + +/* 0x1010 - Fixed Interval Timer (FIT) Exception */ + START_EXCEPTION(0x1010, FITExceptionTrap) + b FITException + +/* 0x1020 - Watchdog Timer (WDT) Exception */ + START_EXCEPTION(0x1020, WDTExceptionTrap) + b WDTException + +/* 0x1100 - Data TLB Miss Exception + * As the name implies, translation is not in the MMU, so search the + * page tables and fix it. The only purpose of this function is to + * load TLB entries from the page table if they exist. + */ + START_EXCEPTION(0x1100, DTLBMiss) + mtspr SPRN_SPRG_SCRATCH5, r10 /* Save some working registers */ + mtspr SPRN_SPRG_SCRATCH6, r11 + mtspr SPRN_SPRG_SCRATCH3, r12 + mtspr SPRN_SPRG_SCRATCH4, r9 + mfcr r12 + mfspr r9, SPRN_PID + rlwimi r12, r9, 0, 0xff + mfspr r10, SPRN_DEAR /* Get faulting address */ + + /* If we are faulting a kernel address, we have to use the + * kernel page tables. + */ + lis r11, PAGE_OFFSET@h + cmplw r10, r11 + blt+ 3f + lis r11, swapper_pg_dir@h + ori r11, r11, swapper_pg_dir@l + li r9, 0 + mtspr SPRN_PID, r9 /* TLB will have 0 TID */ + b 4f + + /* Get the PGD for the current thread. + */ +3: + mfspr r11,SPRN_SPRG_THREAD + lwz r11,PGDIR(r11) +#ifdef CONFIG_PPC_KUAP + rlwinm. r9, r9, 0, 0xff + beq 5f /* Kuap fault */ +#endif +4: + tophys(r11, r11) + rlwimi r11, r10, 12, 20, 29 /* Create L1 (pgdir/pmd) address */ + lwz r11, 0(r11) /* Get L1 entry */ + andi. r9, r11, _PMD_PRESENT /* Check if it points to a PTE page */ + beq 2f /* Bail if no table */ + + rlwimi r11, r10, 22, 20, 29 /* Compute PTE address */ + lwz r11, 0(r11) /* Get Linux PTE */ + li r9, _PAGE_PRESENT | _PAGE_ACCESSED + andc. r9, r9, r11 /* Check permission */ + bne 5f + + rlwinm r9, r11, 1, _PAGE_RW /* dirty => rw */ + and r9, r9, r11 /* hwwrite = dirty & rw */ + rlwimi r11, r9, 0, _PAGE_RW /* replace rw by hwwrite */ + + /* Create TLB tag. This is the faulting address plus a static + * set of bits. These are size, valid, E, U0. + */ + li r9, 0x00c0 + rlwimi r10, r9, 0, 20, 31 + + b finish_tlb_load + +2: /* Check for possible large-page pmd entry */ + rlwinm. r9, r11, 2, 22, 24 + beq 5f + + /* Create TLB tag. This is the faulting address, plus a static + * set of bits (valid, E, U0) plus the size from the PMD. + */ + ori r9, r9, 0x40 + rlwimi r10, r9, 0, 20, 31 + + b finish_tlb_load + +5: + /* The bailout. Restore registers to pre-exception conditions + * and call the heavyweights to help us out. + */ + mtspr SPRN_PID, r12 + mtcrf 0x80, r12 + mfspr r9, SPRN_SPRG_SCRATCH4 + mfspr r12, SPRN_SPRG_SCRATCH3 + mfspr r11, SPRN_SPRG_SCRATCH6 + mfspr r10, SPRN_SPRG_SCRATCH5 + b DataStorage + +/* 0x1200 - Instruction TLB Miss Exception + * Nearly the same as above, except we get our information from different + * registers and bailout to a different point. + */ + START_EXCEPTION(0x1200, ITLBMiss) + mtspr SPRN_SPRG_SCRATCH5, r10 /* Save some working registers */ + mtspr SPRN_SPRG_SCRATCH6, r11 + mtspr SPRN_SPRG_SCRATCH3, r12 + mtspr SPRN_SPRG_SCRATCH4, r9 + mfcr r12 + mfspr r9, SPRN_PID + rlwimi r12, r9, 0, 0xff + mfspr r10, SPRN_SRR0 /* Get faulting address */ + + /* If we are faulting a kernel address, we have to use the + * kernel page tables. + */ + lis r11, PAGE_OFFSET@h + cmplw r10, r11 + blt+ 3f + lis r11, swapper_pg_dir@h + ori r11, r11, swapper_pg_dir@l + li r9, 0 + mtspr SPRN_PID, r9 /* TLB will have 0 TID */ + b 4f + + /* Get the PGD for the current thread. + */ +3: + mfspr r11,SPRN_SPRG_THREAD + lwz r11,PGDIR(r11) +#ifdef CONFIG_PPC_KUAP + rlwinm. r9, r9, 0, 0xff + beq 5f /* Kuap fault */ +#endif +4: + tophys(r11, r11) + rlwimi r11, r10, 12, 20, 29 /* Create L1 (pgdir/pmd) address */ + lwz r11, 0(r11) /* Get L1 entry */ + andi. r9, r11, _PMD_PRESENT /* Check if it points to a PTE page */ + beq 2f /* Bail if no table */ + + rlwimi r11, r10, 22, 20, 29 /* Compute PTE address */ + lwz r11, 0(r11) /* Get Linux PTE */ + li r9, _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC + andc. r9, r9, r11 /* Check permission */ + bne 5f + + rlwinm r9, r11, 1, _PAGE_RW /* dirty => rw */ + and r9, r9, r11 /* hwwrite = dirty & rw */ + rlwimi r11, r9, 0, _PAGE_RW /* replace rw by hwwrite */ + + /* Create TLB tag. This is the faulting address plus a static + * set of bits. These are size, valid, E, U0. + */ + li r9, 0x00c0 + rlwimi r10, r9, 0, 20, 31 + + b finish_tlb_load + +2: /* Check for possible large-page pmd entry */ + rlwinm. r9, r11, 2, 22, 24 + beq 5f + + /* Create TLB tag. This is the faulting address, plus a static + * set of bits (valid, E, U0) plus the size from the PMD. + */ + ori r9, r9, 0x40 + rlwimi r10, r9, 0, 20, 31 + + b finish_tlb_load + +5: + /* The bailout. Restore registers to pre-exception conditions + * and call the heavyweights to help us out. + */ + mtspr SPRN_PID, r12 + mtcrf 0x80, r12 + mfspr r9, SPRN_SPRG_SCRATCH4 + mfspr r12, SPRN_SPRG_SCRATCH3 + mfspr r11, SPRN_SPRG_SCRATCH6 + mfspr r10, SPRN_SPRG_SCRATCH5 + b InstructionAccess + + EXCEPTION(0x1300, Trap_13, unknown_exception) + EXCEPTION(0x1400, Trap_14, unknown_exception) + EXCEPTION(0x1500, Trap_15, unknown_exception) + EXCEPTION(0x1600, Trap_16, unknown_exception) + EXCEPTION(0x1700, Trap_17, unknown_exception) + EXCEPTION(0x1800, Trap_18, unknown_exception) + EXCEPTION(0x1900, Trap_19, unknown_exception) + EXCEPTION(0x1A00, Trap_1A, unknown_exception) + EXCEPTION(0x1B00, Trap_1B, unknown_exception) + EXCEPTION(0x1C00, Trap_1C, unknown_exception) + EXCEPTION(0x1D00, Trap_1D, unknown_exception) + EXCEPTION(0x1E00, Trap_1E, unknown_exception) + EXCEPTION(0x1F00, Trap_1F, unknown_exception) + +/* Check for a single step debug exception while in an exception + * handler before state has been saved. This is to catch the case + * where an instruction that we are trying to single step causes + * an exception (eg ITLB/DTLB miss) and thus the first instruction of + * the exception handler generates a single step debug exception. + * + * If we get a debug trap on the first instruction of an exception handler, + * we reset the MSR_DE in the _exception handler's_ MSR (the debug trap is + * a critical exception, so we are using SPRN_CSRR1 to manipulate the MSR). + * The exception handler was handling a non-critical interrupt, so it will + * save (and later restore) the MSR via SPRN_SRR1, which will still have + * the MSR_DE bit set. + */ + /* 0x2000 - Debug Exception */ + START_EXCEPTION(0x2000, DebugTrap) + CRITICAL_EXCEPTION_PROLOG 0x2000 DebugTrap + + /* + * If this is a single step or branch-taken exception in an + * exception entry sequence, it was probably meant to apply to + * the code where the exception occurred (since exception entry + * doesn't turn off DE automatically). We simulate the effect + * of turning off DE on entry to an exception handler by turning + * off DE in the SRR3 value and clearing the debug status. + */ + mfspr r10,SPRN_DBSR /* check single-step/branch taken */ + andis. r10,r10,DBSR_IC@h + beq+ 2f + + andi. r10,r9,MSR_IR|MSR_PR /* check supervisor + MMU off */ + beq 1f /* branch and fix it up */ + + mfspr r10,SPRN_SRR2 /* Faulting instruction address */ + cmplwi r10,0x2100 + bgt+ 2f /* address above exception vectors */ + + /* here it looks like we got an inappropriate debug exception. */ +1: rlwinm r9,r9,0,~MSR_DE /* clear DE in the SRR3 value */ + lis r10,DBSR_IC@h /* clear the IC event */ + mtspr SPRN_DBSR,r10 + /* restore state and get out */ + lwz r10,_CCR(r11) + lwz r0,GPR0(r11) + lwz r1,GPR1(r11) + mtcrf 0x80,r10 + mtspr SPRN_SRR2,r12 + mtspr SPRN_SRR3,r9 + lwz r9,GPR9(r11) + lwz r12,GPR12(r11) + lwz r10,crit_r10@l(0) + lwz r11,crit_r11@l(0) + rfci + b . + + /* continue normal handling for a critical exception... */ +2: mfspr r4,SPRN_DBSR + stw r4,_ESR(r11) /* DebugException takes DBSR in _ESR */ + prepare_transfer_to_handler + bl DebugException + b ret_from_crit_exc + + /* Programmable Interval Timer (PIT) Exception. (from 0x1000) */ + __HEAD +Decrementer: + EXCEPTION_PROLOG 0x1000 Decrementer + lis r0,TSR_PIS@h + mtspr SPRN_TSR,r0 /* Clear the PIT exception */ + prepare_transfer_to_handler + bl timer_interrupt + b interrupt_return + + /* Fixed Interval Timer (FIT) Exception. (from 0x1010) */ + __HEAD +FITException: + EXCEPTION_PROLOG 0x1010 FITException + prepare_transfer_to_handler + bl unknown_exception + b interrupt_return + + /* Watchdog Timer (WDT) Exception. (from 0x1020) */ + __HEAD +WDTException: + CRITICAL_EXCEPTION_PROLOG 0x1020 WDTException + prepare_transfer_to_handler + bl WatchdogException + b ret_from_crit_exc + +/* Other PowerPC processors, namely those derived from the 6xx-series + * have vectors from 0x2100 through 0x2F00 defined, but marked as reserved. + * However, for the 4xx-series processors these are neither defined nor + * reserved. + */ + + __HEAD + /* Damn, I came up one instruction too many to fit into the + * exception space :-). Both the instruction and data TLB + * miss get to this point to load the TLB. + * r10 - TLB_TAG value + * r11 - Linux PTE + * r9 - available to use + * PID - loaded with proper value when we get here + * Upon exit, we reload everything and RFI. + * Actually, it will fit now, but oh well.....a common place + * to load the TLB. + */ +tlb_4xx_index: + .long 0 +finish_tlb_load: + /* + * Clear out the software-only bits in the PTE to generate the + * TLB_DATA value. These are the bottom 2 bits of the RPM, the + * top 3 bits of the zone field, and M. + */ + li r9, 0x0ce2 + andc r11, r11, r9 + + /* load the next available TLB index. */ + lwz r9, tlb_4xx_index@l(0) + addi r9, r9, 1 + andi. r9, r9, PPC40X_TLB_SIZE - 1 + stw r9, tlb_4xx_index@l(0) + + tlbwe r11, r9, TLB_DATA /* Load TLB LO */ + tlbwe r10, r9, TLB_TAG /* Load TLB HI */ + + /* Done...restore registers and get out of here. + */ + mtspr SPRN_PID, r12 + mtcrf 0x80, r12 + mfspr r9, SPRN_SPRG_SCRATCH4 + mfspr r12, SPRN_SPRG_SCRATCH3 + mfspr r11, SPRN_SPRG_SCRATCH6 + mfspr r10, SPRN_SPRG_SCRATCH5 + rfi /* Should sync shadow TLBs */ + b . /* prevent prefetch past rfi */ + +/* This is where the main kernel code starts. + */ +start_here: + + /* ptr to current */ + lis r2,init_task@h + ori r2,r2,init_task@l + + /* ptr to phys current thread */ + tophys(r4,r2) + addi r4,r4,THREAD /* init task's THREAD */ + mtspr SPRN_SPRG_THREAD,r4 + + /* stack */ + lis r1,init_thread_union@ha + addi r1,r1,init_thread_union@l + li r0,0 + stwu r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1) + + bl early_init /* We have to do this with MMU on */ + +/* + * Decide what sort of machine this is and initialize the MMU. + */ +#ifdef CONFIG_KASAN + bl kasan_early_init +#endif + li r3,0 + mr r4,r31 + bl machine_init + bl MMU_init + +/* Go back to running unmapped so we can load up new values + * and change to using our exception vectors. + * On the 4xx, all we have to do is invalidate the TLB to clear + * the old 16M byte TLB mappings. + */ + lis r4,2f@h + ori r4,r4,2f@l + tophys(r4,r4) + lis r3,(MSR_KERNEL & ~(MSR_IR|MSR_DR))@h + ori r3,r3,(MSR_KERNEL & ~(MSR_IR|MSR_DR))@l + mtspr SPRN_SRR0,r4 + mtspr SPRN_SRR1,r3 + rfi + b . /* prevent prefetch past rfi */ + +/* Load up the kernel context */ +2: + sync /* Flush to memory before changing TLB */ + tlbia + isync /* Flush shadow TLBs */ + + /* set up the PTE pointers for the Abatron bdiGDB. + */ + lis r6, swapper_pg_dir@h + ori r6, r6, swapper_pg_dir@l + lis r5, abatron_pteptrs@h + ori r5, r5, abatron_pteptrs@l + stw r5, 0xf0(0) /* Must match your Abatron config file */ + tophys(r5,r5) + stw r6, 0(r5) + +/* Now turn on the MMU for real! */ + lis r4,MSR_KERNEL@h + ori r4,r4,MSR_KERNEL@l + lis r3,start_kernel@h + ori r3,r3,start_kernel@l + mtspr SPRN_SRR0,r3 + mtspr SPRN_SRR1,r4 + rfi /* enable MMU and jump to start_kernel */ + b . /* prevent prefetch past rfi */ + +/* Set up the initial MMU state so we can do the first level of + * kernel initialization. This maps the first 32 MBytes of memory 1:1 + * virtual to physical and more importantly sets the cache mode. + */ +initial_mmu: + tlbia /* Invalidate all TLB entries */ + isync + + /* We should still be executing code at physical address 0x0000xxxx + * at this point. However, start_here is at virtual address + * 0xC000xxxx. So, set up a TLB mapping to cover this once + * translation is enabled. + */ + + lis r3,KERNELBASE@h /* Load the kernel virtual address */ + ori r3,r3,KERNELBASE@l + tophys(r4,r3) /* Load the kernel physical address */ + + iccci r0,r3 /* Invalidate the i-cache before use */ + + /* Load the kernel PID. + */ + li r0,0 + mtspr SPRN_PID,r0 + sync + + /* Configure and load one entry into TLB slots 63 */ + clrrwi r4,r4,10 /* Mask off the real page number */ + ori r4,r4,(TLB_WR | TLB_EX) /* Set the write and execute bits */ + + clrrwi r3,r3,10 /* Mask off the effective page number */ + ori r3,r3,(TLB_VALID | TLB_PAGESZ(PAGESZ_16M)) + + li r0,63 /* TLB slot 63 */ + + tlbwe r4,r0,TLB_DATA /* Load the data portion of the entry */ + tlbwe r3,r0,TLB_TAG /* Load the tag portion of the entry */ + + li r0,62 /* TLB slot 62 */ + addis r4,r4,SZ_16M@h + addis r3,r3,SZ_16M@h + tlbwe r4,r0,TLB_DATA /* Load the data portion of the entry */ + tlbwe r3,r0,TLB_TAG /* Load the tag portion of the entry */ + + isync + + /* Establish the exception vector base + */ + lis r4,KERNELBASE@h /* EVPR only uses the high 16-bits */ + tophys(r0,r4) /* Use the physical address */ + mtspr SPRN_EVPR,r0 + + blr + +_GLOBAL(abort) + mfspr r13,SPRN_DBCR0 + oris r13,r13,DBCR0_RST_SYSTEM@h + mtspr SPRN_DBCR0,r13 diff --git a/arch/powerpc/kernel/head_44x.S b/arch/powerpc/kernel/head_44x.S new file mode 100644 index 000000000..f15cb9fdb --- /dev/null +++ b/arch/powerpc/kernel/head_44x.S @@ -0,0 +1,1251 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Kernel execution entry point code. + * + * Copyright (c) 1995-1996 Gary Thomas <gdt@linuxppc.org> + * Initial PowerPC version. + * Copyright (c) 1996 Cort Dougan <cort@cs.nmt.edu> + * Rewritten for PReP + * Copyright (c) 1996 Paul Mackerras <paulus@cs.anu.edu.au> + * Low-level exception handers, MMU support, and rewrite. + * Copyright (c) 1997 Dan Malek <dmalek@jlc.net> + * PowerPC 8xx modifications. + * Copyright (c) 1998-1999 TiVo, Inc. + * PowerPC 403GCX modifications. + * Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu> + * PowerPC 403GCX/405GP modifications. + * Copyright 2000 MontaVista Software Inc. + * PPC405 modifications + * PowerPC 403GCX/405GP modifications. + * Author: MontaVista Software, Inc. + * frank_rowand@mvista.com or source@mvista.com + * debbie_chu@mvista.com + * Copyright 2002-2005 MontaVista Software, Inc. + * PowerPC 44x support, Matt Porter <mporter@kernel.crashing.org> + */ + +#include <linux/init.h> +#include <linux/pgtable.h> +#include <asm/processor.h> +#include <asm/page.h> +#include <asm/mmu.h> +#include <asm/cputable.h> +#include <asm/thread_info.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/ptrace.h> +#include <asm/synch.h> +#include <asm/export.h> +#include <asm/code-patching-asm.h> +#include "head_booke.h" + + +/* As with the other PowerPC ports, it is expected that when code + * execution begins here, the following registers contain valid, yet + * optional, information: + * + * r3 - Board info structure pointer (DRAM, frequency, MAC address, etc.) + * r4 - Starting address of the init RAM disk + * r5 - Ending address of the init RAM disk + * r6 - Start of kernel command line string (e.g. "mem=128") + * r7 - End of kernel command line string + * + */ + __HEAD +_GLOBAL(_stext); +_GLOBAL(_start); + /* + * Reserve a word at a fixed location to store the address + * of abatron_pteptrs + */ + nop + mr r31,r3 /* save device tree ptr */ + li r24,0 /* CPU number */ + +#ifdef CONFIG_RELOCATABLE +/* + * Relocate ourselves to the current runtime address. + * This is called only by the Boot CPU. + * "relocate" is called with our current runtime virutal + * address. + * r21 will be loaded with the physical runtime address of _stext + */ + bcl 20,31,$+4 /* Get our runtime address */ +0: mflr r21 /* Make it accessible */ + addis r21,r21,(_stext - 0b)@ha + addi r21,r21,(_stext - 0b)@l /* Get our current runtime base */ + + /* + * We have the runtime (virutal) address of our base. + * We calculate our shift of offset from a 256M page. + * We could map the 256M page we belong to at PAGE_OFFSET and + * get going from there. + */ + lis r4,KERNELBASE@h + ori r4,r4,KERNELBASE@l + rlwinm r6,r21,0,4,31 /* r6 = PHYS_START % 256M */ + rlwinm r5,r4,0,4,31 /* r5 = KERNELBASE % 256M */ + subf r3,r5,r6 /* r3 = r6 - r5 */ + add r3,r4,r3 /* Required Virutal Address */ + + bl relocate +#endif + + bl init_cpu_state + + /* + * This is where the main kernel code starts. + */ + + /* ptr to current */ + lis r2,init_task@h + ori r2,r2,init_task@l + + /* ptr to current thread */ + addi r4,r2,THREAD /* init task's THREAD */ + mtspr SPRN_SPRG_THREAD,r4 + + /* stack */ + lis r1,init_thread_union@h + ori r1,r1,init_thread_union@l + li r0,0 + stwu r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1) + + bl early_init + +#ifdef CONFIG_RELOCATABLE + /* + * Relocatable kernel support based on processing of dynamic + * relocation entries. + * + * r25 will contain RPN/ERPN for the start address of memory + * r21 will contain the current offset of _stext + */ + lis r3,kernstart_addr@ha + la r3,kernstart_addr@l(r3) + + /* + * Compute the kernstart_addr. + * kernstart_addr => (r6,r8) + * kernstart_addr & ~0xfffffff => (r6,r7) + */ + rlwinm r6,r25,0,28,31 /* ERPN. Bits 32-35 of Address */ + rlwinm r7,r25,0,0,3 /* RPN - assuming 256 MB page size */ + rlwinm r8,r21,0,4,31 /* r8 = (_stext & 0xfffffff) */ + or r8,r7,r8 /* Compute the lower 32bit of kernstart_addr */ + + /* Store kernstart_addr */ + stw r6,0(r3) /* higher 32bit */ + stw r8,4(r3) /* lower 32bit */ + + /* + * Compute the virt_phys_offset : + * virt_phys_offset = stext.run - kernstart_addr + * + * stext.run = (KERNELBASE & ~0xfffffff) + (kernstart_addr & 0xfffffff) + * When we relocate, we have : + * + * (kernstart_addr & 0xfffffff) = (stext.run & 0xfffffff) + * + * hence: + * virt_phys_offset = (KERNELBASE & ~0xfffffff) - (kernstart_addr & ~0xfffffff) + * + */ + + /* KERNELBASE&~0xfffffff => (r4,r5) */ + li r4, 0 /* higer 32bit */ + lis r5,KERNELBASE@h + rlwinm r5,r5,0,0,3 /* Align to 256M, lower 32bit */ + + /* + * 64bit subtraction. + */ + subfc r5,r7,r5 + subfe r4,r6,r4 + + /* Store virt_phys_offset */ + lis r3,virt_phys_offset@ha + la r3,virt_phys_offset@l(r3) + + stw r4,0(r3) + stw r5,4(r3) + +#elif defined(CONFIG_DYNAMIC_MEMSTART) + /* + * Mapping based, page aligned dynamic kernel loading. + * + * r25 will contain RPN/ERPN for the start address of memory + * + * Add the difference between KERNELBASE and PAGE_OFFSET to the + * start of physical memory to get kernstart_addr. + */ + lis r3,kernstart_addr@ha + la r3,kernstart_addr@l(r3) + + lis r4,KERNELBASE@h + ori r4,r4,KERNELBASE@l + lis r5,PAGE_OFFSET@h + ori r5,r5,PAGE_OFFSET@l + subf r4,r5,r4 + + rlwinm r6,r25,0,28,31 /* ERPN */ + rlwinm r7,r25,0,0,3 /* RPN - assuming 256 MB page size */ + add r7,r7,r4 + + stw r6,0(r3) + stw r7,4(r3) +#endif + +/* + * Decide what sort of machine this is and initialize the MMU. + */ +#ifdef CONFIG_KASAN + bl kasan_early_init +#endif + li r3,0 + mr r4,r31 + bl machine_init + bl MMU_init + + /* Setup PTE pointers for the Abatron bdiGDB */ + lis r6, swapper_pg_dir@h + ori r6, r6, swapper_pg_dir@l + lis r5, abatron_pteptrs@h + ori r5, r5, abatron_pteptrs@l + lis r4, KERNELBASE@h + ori r4, r4, KERNELBASE@l + stw r5, 0(r4) /* Save abatron_pteptrs at a fixed location */ + stw r6, 0(r5) + + /* Clear the Machine Check Syndrome Register */ + li r0,0 + mtspr SPRN_MCSR,r0 + + /* Let's move on */ + lis r4,start_kernel@h + ori r4,r4,start_kernel@l + lis r3,MSR_KERNEL@h + ori r3,r3,MSR_KERNEL@l + mtspr SPRN_SRR0,r4 + mtspr SPRN_SRR1,r3 + rfi /* change context and jump to start_kernel */ + +/* + * Interrupt vector entry code + * + * The Book E MMUs are always on so we don't need to handle + * interrupts in real mode as with previous PPC processors. In + * this case we handle interrupts in the kernel virtual address + * space. + * + * Interrupt vectors are dynamically placed relative to the + * interrupt prefix as determined by the address of interrupt_base. + * The interrupt vectors offsets are programmed using the labels + * for each interrupt vector entry. + * + * Interrupt vectors must be aligned on a 16 byte boundary. + * We align on a 32 byte cache line boundary for good measure. + */ + +interrupt_base: + /* Critical Input Interrupt */ + CRITICAL_EXCEPTION(0x0100, CRITICAL, CriticalInput, unknown_exception) + + /* Machine Check Interrupt */ + CRITICAL_EXCEPTION(0x0200, MACHINE_CHECK, MachineCheck, \ + machine_check_exception) + MCHECK_EXCEPTION(0x0210, MachineCheckA, machine_check_exception) + + /* Data Storage Interrupt */ + DATA_STORAGE_EXCEPTION + + /* Instruction Storage Interrupt */ + INSTRUCTION_STORAGE_EXCEPTION + + /* External Input Interrupt */ + EXCEPTION(0x0500, BOOKE_INTERRUPT_EXTERNAL, ExternalInput, do_IRQ) + + /* Alignment Interrupt */ + ALIGNMENT_EXCEPTION + + /* Program Interrupt */ + PROGRAM_EXCEPTION + + /* Floating Point Unavailable Interrupt */ +#ifdef CONFIG_PPC_FPU + FP_UNAVAILABLE_EXCEPTION +#else + EXCEPTION(0x2010, BOOKE_INTERRUPT_FP_UNAVAIL, \ + FloatingPointUnavailable, unknown_exception) +#endif + /* System Call Interrupt */ + START_EXCEPTION(SystemCall) + SYSCALL_ENTRY 0xc00 BOOKE_INTERRUPT_SYSCALL + + /* Auxiliary Processor Unavailable Interrupt */ + EXCEPTION(0x2020, BOOKE_INTERRUPT_AP_UNAVAIL, \ + AuxillaryProcessorUnavailable, unknown_exception) + + /* Decrementer Interrupt */ + DECREMENTER_EXCEPTION + + /* Fixed Internal Timer Interrupt */ + /* TODO: Add FIT support */ + EXCEPTION(0x1010, BOOKE_INTERRUPT_FIT, FixedIntervalTimer, unknown_exception) + + /* Watchdog Timer Interrupt */ + /* TODO: Add watchdog support */ +#ifdef CONFIG_BOOKE_WDT + CRITICAL_EXCEPTION(0x1020, WATCHDOG, WatchdogTimer, WatchdogException) +#else + CRITICAL_EXCEPTION(0x1020, WATCHDOG, WatchdogTimer, unknown_exception) +#endif + + /* Data TLB Error Interrupt */ + START_EXCEPTION(DataTLBError44x) + mtspr SPRN_SPRG_WSCRATCH0, r10 /* Save some working registers */ + mtspr SPRN_SPRG_WSCRATCH1, r11 + mtspr SPRN_SPRG_WSCRATCH2, r12 + mtspr SPRN_SPRG_WSCRATCH3, r13 + mfcr r11 + mtspr SPRN_SPRG_WSCRATCH4, r11 + mfspr r10, SPRN_DEAR /* Get faulting address */ + + /* If we are faulting a kernel address, we have to use the + * kernel page tables. + */ + lis r11, PAGE_OFFSET@h + cmplw r10, r11 + blt+ 3f + lis r11, swapper_pg_dir@h + ori r11, r11, swapper_pg_dir@l + + mfspr r12,SPRN_MMUCR + rlwinm r12,r12,0,0,23 /* Clear TID */ + + b 4f + + /* Get the PGD for the current thread */ +3: + mfspr r11,SPRN_SPRG_THREAD + lwz r11,PGDIR(r11) + + /* Load PID into MMUCR TID */ + mfspr r12,SPRN_MMUCR + mfspr r13,SPRN_PID /* Get PID */ + rlwimi r12,r13,0,24,31 /* Set TID */ +#ifdef CONFIG_PPC_KUAP + cmpwi r13,0 + beq 2f /* KUAP Fault */ +#endif + +4: + mtspr SPRN_MMUCR,r12 + + /* Mask of required permission bits. Note that while we + * do copy ESR:ST to _PAGE_RW position as trying to write + * to an RO page is pretty common, we don't do it with + * _PAGE_DIRTY. We could do it, but it's a fairly rare + * event so I'd rather take the overhead when it happens + * rather than adding an instruction here. We should measure + * whether the whole thing is worth it in the first place + * as we could avoid loading SPRN_ESR completely in the first + * place... + * + * TODO: Is it worth doing that mfspr & rlwimi in the first + * place or can we save a couple of instructions here ? + */ + mfspr r12,SPRN_ESR + li r13,_PAGE_PRESENT|_PAGE_ACCESSED + rlwimi r13,r12,10,30,30 + + /* Load the PTE */ + /* Compute pgdir/pmd offset */ + rlwinm r12, r10, PPC44x_PGD_OFF_SHIFT, PPC44x_PGD_OFF_MASK_BIT, 29 + lwzx r11, r12, r11 /* Get pgd/pmd entry */ + rlwinm. r12, r11, 0, 0, 20 /* Extract pt base address */ + beq 2f /* Bail if no table */ + + /* Compute pte address */ + rlwimi r12, r10, PPC44x_PTE_ADD_SHIFT, PPC44x_PTE_ADD_MASK_BIT, 28 + lwz r11, 0(r12) /* Get high word of pte entry */ + lwz r12, 4(r12) /* Get low word of pte entry */ + + lis r10,tlb_44x_index@ha + + andc. r13,r13,r12 /* Check permission */ + + /* Load the next available TLB index */ + lwz r13,tlb_44x_index@l(r10) + + bne 2f /* Bail if permission mismatch */ + + /* Increment, rollover, and store TLB index */ + addi r13,r13,1 + + patch_site 0f, patch__tlb_44x_hwater_D + /* Compare with watermark (instruction gets patched) */ +0: cmpwi 0,r13,1 /* reserve entries */ + ble 5f + li r13,0 +5: + /* Store the next available TLB index */ + stw r13,tlb_44x_index@l(r10) + + /* Re-load the faulting address */ + mfspr r10,SPRN_DEAR + + /* Jump to common tlb load */ + b finish_tlb_load_44x + +2: + /* The bailout. Restore registers to pre-exception conditions + * and call the heavyweights to help us out. + */ + mfspr r11, SPRN_SPRG_RSCRATCH4 + mtcr r11 + mfspr r13, SPRN_SPRG_RSCRATCH3 + mfspr r12, SPRN_SPRG_RSCRATCH2 + mfspr r11, SPRN_SPRG_RSCRATCH1 + mfspr r10, SPRN_SPRG_RSCRATCH0 + b DataStorage + + /* Instruction TLB Error Interrupt */ + /* + * Nearly the same as above, except we get our + * information from different registers and bailout + * to a different point. + */ + START_EXCEPTION(InstructionTLBError44x) + mtspr SPRN_SPRG_WSCRATCH0, r10 /* Save some working registers */ + mtspr SPRN_SPRG_WSCRATCH1, r11 + mtspr SPRN_SPRG_WSCRATCH2, r12 + mtspr SPRN_SPRG_WSCRATCH3, r13 + mfcr r11 + mtspr SPRN_SPRG_WSCRATCH4, r11 + mfspr r10, SPRN_SRR0 /* Get faulting address */ + + /* If we are faulting a kernel address, we have to use the + * kernel page tables. + */ + lis r11, PAGE_OFFSET@h + cmplw r10, r11 + blt+ 3f + lis r11, swapper_pg_dir@h + ori r11, r11, swapper_pg_dir@l + + mfspr r12,SPRN_MMUCR + rlwinm r12,r12,0,0,23 /* Clear TID */ + + b 4f + + /* Get the PGD for the current thread */ +3: + mfspr r11,SPRN_SPRG_THREAD + lwz r11,PGDIR(r11) + + /* Load PID into MMUCR TID */ + mfspr r12,SPRN_MMUCR + mfspr r13,SPRN_PID /* Get PID */ + rlwimi r12,r13,0,24,31 /* Set TID */ +#ifdef CONFIG_PPC_KUAP + cmpwi r13,0 + beq 2f /* KUAP Fault */ +#endif + +4: + mtspr SPRN_MMUCR,r12 + + /* Make up the required permissions */ + li r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC + + /* Compute pgdir/pmd offset */ + rlwinm r12, r10, PPC44x_PGD_OFF_SHIFT, PPC44x_PGD_OFF_MASK_BIT, 29 + lwzx r11, r12, r11 /* Get pgd/pmd entry */ + rlwinm. r12, r11, 0, 0, 20 /* Extract pt base address */ + beq 2f /* Bail if no table */ + + /* Compute pte address */ + rlwimi r12, r10, PPC44x_PTE_ADD_SHIFT, PPC44x_PTE_ADD_MASK_BIT, 28 + lwz r11, 0(r12) /* Get high word of pte entry */ + lwz r12, 4(r12) /* Get low word of pte entry */ + + lis r10,tlb_44x_index@ha + + andc. r13,r13,r12 /* Check permission */ + + /* Load the next available TLB index */ + lwz r13,tlb_44x_index@l(r10) + + bne 2f /* Bail if permission mismatch */ + + /* Increment, rollover, and store TLB index */ + addi r13,r13,1 + + patch_site 0f, patch__tlb_44x_hwater_I + /* Compare with watermark (instruction gets patched) */ +0: cmpwi 0,r13,1 /* reserve entries */ + ble 5f + li r13,0 +5: + /* Store the next available TLB index */ + stw r13,tlb_44x_index@l(r10) + + /* Re-load the faulting address */ + mfspr r10,SPRN_SRR0 + + /* Jump to common TLB load point */ + b finish_tlb_load_44x + +2: + /* The bailout. Restore registers to pre-exception conditions + * and call the heavyweights to help us out. + */ + mfspr r11, SPRN_SPRG_RSCRATCH4 + mtcr r11 + mfspr r13, SPRN_SPRG_RSCRATCH3 + mfspr r12, SPRN_SPRG_RSCRATCH2 + mfspr r11, SPRN_SPRG_RSCRATCH1 + mfspr r10, SPRN_SPRG_RSCRATCH0 + b InstructionStorage + +/* + * Both the instruction and data TLB miss get to this + * point to load the TLB. + * r10 - EA of fault + * r11 - PTE high word value + * r12 - PTE low word value + * r13 - TLB index + * MMUCR - loaded with proper value when we get here + * Upon exit, we reload everything and RFI. + */ +finish_tlb_load_44x: + /* Combine RPN & ERPN an write WS 0 */ + rlwimi r11,r12,0,0,31-PAGE_SHIFT + tlbwe r11,r13,PPC44x_TLB_XLAT + + /* + * Create WS1. This is the faulting address (EPN), + * page size, and valid flag. + */ + li r11,PPC44x_TLB_VALID | PPC44x_TLBE_SIZE + /* Insert valid and page size */ + rlwimi r10,r11,0,PPC44x_PTE_ADD_MASK_BIT,31 + tlbwe r10,r13,PPC44x_TLB_PAGEID /* Write PAGEID */ + + /* And WS 2 */ + li r10,0xf85 /* Mask to apply from PTE */ + rlwimi r10,r12,29,30,30 /* DIRTY -> SW position */ + and r11,r12,r10 /* Mask PTE bits to keep */ + andi. r10,r12,_PAGE_USER /* User page ? */ + beq 1f /* nope, leave U bits empty */ + rlwimi r11,r11,3,26,28 /* yes, copy S bits to U */ + rlwinm r11,r11,0,~PPC44x_TLB_SX /* Clear SX if User page */ +1: tlbwe r11,r13,PPC44x_TLB_ATTRIB /* Write ATTRIB */ + + /* Done...restore registers and get out of here. + */ + mfspr r11, SPRN_SPRG_RSCRATCH4 + mtcr r11 + mfspr r13, SPRN_SPRG_RSCRATCH3 + mfspr r12, SPRN_SPRG_RSCRATCH2 + mfspr r11, SPRN_SPRG_RSCRATCH1 + mfspr r10, SPRN_SPRG_RSCRATCH0 + rfi /* Force context change */ + +/* TLB error interrupts for 476 + */ +#ifdef CONFIG_PPC_47x + START_EXCEPTION(DataTLBError47x) + mtspr SPRN_SPRG_WSCRATCH0,r10 /* Save some working registers */ + mtspr SPRN_SPRG_WSCRATCH1,r11 + mtspr SPRN_SPRG_WSCRATCH2,r12 + mtspr SPRN_SPRG_WSCRATCH3,r13 + mfcr r11 + mtspr SPRN_SPRG_WSCRATCH4,r11 + mfspr r10,SPRN_DEAR /* Get faulting address */ + + /* If we are faulting a kernel address, we have to use the + * kernel page tables. + */ + lis r11,PAGE_OFFSET@h + cmplw cr0,r10,r11 + blt+ 3f + lis r11,swapper_pg_dir@h + ori r11,r11, swapper_pg_dir@l + li r12,0 /* MMUCR = 0 */ + b 4f + + /* Get the PGD for the current thread and setup MMUCR */ +3: mfspr r11,SPRN_SPRG3 + lwz r11,PGDIR(r11) + mfspr r12,SPRN_PID /* Get PID */ +#ifdef CONFIG_PPC_KUAP + cmpwi r12,0 + beq 2f /* KUAP Fault */ +#endif +4: mtspr SPRN_MMUCR,r12 /* Set MMUCR */ + + /* Mask of required permission bits. Note that while we + * do copy ESR:ST to _PAGE_RW position as trying to write + * to an RO page is pretty common, we don't do it with + * _PAGE_DIRTY. We could do it, but it's a fairly rare + * event so I'd rather take the overhead when it happens + * rather than adding an instruction here. We should measure + * whether the whole thing is worth it in the first place + * as we could avoid loading SPRN_ESR completely in the first + * place... + * + * TODO: Is it worth doing that mfspr & rlwimi in the first + * place or can we save a couple of instructions here ? + */ + mfspr r12,SPRN_ESR + li r13,_PAGE_PRESENT|_PAGE_ACCESSED + rlwimi r13,r12,10,30,30 + + /* Load the PTE */ + /* Compute pgdir/pmd offset */ + rlwinm r12,r10,PPC44x_PGD_OFF_SHIFT,PPC44x_PGD_OFF_MASK_BIT,29 + lwzx r11,r12,r11 /* Get pgd/pmd entry */ + + /* Word 0 is EPN,V,TS,DSIZ */ + li r12,PPC47x_TLB0_VALID | PPC47x_TLBE_SIZE + rlwimi r10,r12,0,32-PAGE_SHIFT,31 /* Insert valid and page size*/ + li r12,0 + tlbwe r10,r12,0 + + /* XXX can we do better ? Need to make sure tlbwe has established + * latch V bit in MMUCR0 before the PTE is loaded further down */ +#ifdef CONFIG_SMP + isync +#endif + + rlwinm. r12,r11,0,0,20 /* Extract pt base address */ + /* Compute pte address */ + rlwimi r12,r10,PPC44x_PTE_ADD_SHIFT,PPC44x_PTE_ADD_MASK_BIT,28 + beq 2f /* Bail if no table */ + lwz r11,0(r12) /* Get high word of pte entry */ + + /* XXX can we do better ? maybe insert a known 0 bit from r11 into the + * bottom of r12 to create a data dependency... We can also use r10 + * as destination nowadays + */ +#ifdef CONFIG_SMP + lwsync +#endif + lwz r12,4(r12) /* Get low word of pte entry */ + + andc. r13,r13,r12 /* Check permission */ + + /* Jump to common tlb load */ + beq finish_tlb_load_47x + +2: /* The bailout. Restore registers to pre-exception conditions + * and call the heavyweights to help us out. + */ + mfspr r11,SPRN_SPRG_RSCRATCH4 + mtcr r11 + mfspr r13,SPRN_SPRG_RSCRATCH3 + mfspr r12,SPRN_SPRG_RSCRATCH2 + mfspr r11,SPRN_SPRG_RSCRATCH1 + mfspr r10,SPRN_SPRG_RSCRATCH0 + b DataStorage + + /* Instruction TLB Error Interrupt */ + /* + * Nearly the same as above, except we get our + * information from different registers and bailout + * to a different point. + */ + START_EXCEPTION(InstructionTLBError47x) + mtspr SPRN_SPRG_WSCRATCH0,r10 /* Save some working registers */ + mtspr SPRN_SPRG_WSCRATCH1,r11 + mtspr SPRN_SPRG_WSCRATCH2,r12 + mtspr SPRN_SPRG_WSCRATCH3,r13 + mfcr r11 + mtspr SPRN_SPRG_WSCRATCH4,r11 + mfspr r10,SPRN_SRR0 /* Get faulting address */ + + /* If we are faulting a kernel address, we have to use the + * kernel page tables. + */ + lis r11,PAGE_OFFSET@h + cmplw cr0,r10,r11 + blt+ 3f + lis r11,swapper_pg_dir@h + ori r11,r11, swapper_pg_dir@l + li r12,0 /* MMUCR = 0 */ + b 4f + + /* Get the PGD for the current thread and setup MMUCR */ +3: mfspr r11,SPRN_SPRG_THREAD + lwz r11,PGDIR(r11) + mfspr r12,SPRN_PID /* Get PID */ +#ifdef CONFIG_PPC_KUAP + cmpwi r12,0 + beq 2f /* KUAP Fault */ +#endif +4: mtspr SPRN_MMUCR,r12 /* Set MMUCR */ + + /* Make up the required permissions */ + li r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC + + /* Load PTE */ + /* Compute pgdir/pmd offset */ + rlwinm r12,r10,PPC44x_PGD_OFF_SHIFT,PPC44x_PGD_OFF_MASK_BIT,29 + lwzx r11,r12,r11 /* Get pgd/pmd entry */ + + /* Word 0 is EPN,V,TS,DSIZ */ + li r12,PPC47x_TLB0_VALID | PPC47x_TLBE_SIZE + rlwimi r10,r12,0,32-PAGE_SHIFT,31 /* Insert valid and page size*/ + li r12,0 + tlbwe r10,r12,0 + + /* XXX can we do better ? Need to make sure tlbwe has established + * latch V bit in MMUCR0 before the PTE is loaded further down */ +#ifdef CONFIG_SMP + isync +#endif + + rlwinm. r12,r11,0,0,20 /* Extract pt base address */ + /* Compute pte address */ + rlwimi r12,r10,PPC44x_PTE_ADD_SHIFT,PPC44x_PTE_ADD_MASK_BIT,28 + beq 2f /* Bail if no table */ + + lwz r11,0(r12) /* Get high word of pte entry */ + /* XXX can we do better ? maybe insert a known 0 bit from r11 into the + * bottom of r12 to create a data dependency... We can also use r10 + * as destination nowadays + */ +#ifdef CONFIG_SMP + lwsync +#endif + lwz r12,4(r12) /* Get low word of pte entry */ + + andc. r13,r13,r12 /* Check permission */ + + /* Jump to common TLB load point */ + beq finish_tlb_load_47x + +2: /* The bailout. Restore registers to pre-exception conditions + * and call the heavyweights to help us out. + */ + mfspr r11, SPRN_SPRG_RSCRATCH4 + mtcr r11 + mfspr r13, SPRN_SPRG_RSCRATCH3 + mfspr r12, SPRN_SPRG_RSCRATCH2 + mfspr r11, SPRN_SPRG_RSCRATCH1 + mfspr r10, SPRN_SPRG_RSCRATCH0 + b InstructionStorage + +/* + * Both the instruction and data TLB miss get to this + * point to load the TLB. + * r10 - free to use + * r11 - PTE high word value + * r12 - PTE low word value + * r13 - free to use + * MMUCR - loaded with proper value when we get here + * Upon exit, we reload everything and RFI. + */ +finish_tlb_load_47x: + /* Combine RPN & ERPN an write WS 1 */ + rlwimi r11,r12,0,0,31-PAGE_SHIFT + tlbwe r11,r13,1 + + /* And make up word 2 */ + li r10,0xf85 /* Mask to apply from PTE */ + rlwimi r10,r12,29,30,30 /* DIRTY -> SW position */ + and r11,r12,r10 /* Mask PTE bits to keep */ + andi. r10,r12,_PAGE_USER /* User page ? */ + beq 1f /* nope, leave U bits empty */ + rlwimi r11,r11,3,26,28 /* yes, copy S bits to U */ + rlwinm r11,r11,0,~PPC47x_TLB2_SX /* Clear SX if User page */ +1: tlbwe r11,r13,2 + + /* Done...restore registers and get out of here. + */ + mfspr r11, SPRN_SPRG_RSCRATCH4 + mtcr r11 + mfspr r13, SPRN_SPRG_RSCRATCH3 + mfspr r12, SPRN_SPRG_RSCRATCH2 + mfspr r11, SPRN_SPRG_RSCRATCH1 + mfspr r10, SPRN_SPRG_RSCRATCH0 + rfi + +#endif /* CONFIG_PPC_47x */ + + /* Debug Interrupt */ + /* + * This statement needs to exist at the end of the IVPR + * definition just in case you end up taking a debug + * exception within another exception. + */ + DEBUG_CRIT_EXCEPTION + +interrupt_end: + +/* + * Global functions + */ + +/* + * Adjust the machine check IVOR on 440A cores + */ +_GLOBAL(__fixup_440A_mcheck) + li r3,MachineCheckA@l + mtspr SPRN_IVOR1,r3 + sync + blr + +/* + * Init CPU state. This is called at boot time or for secondary CPUs + * to setup initial TLB entries, setup IVORs, etc... + * + */ +_GLOBAL(init_cpu_state) + mflr r22 +#ifdef CONFIG_PPC_47x + /* We use the PVR to differentiate 44x cores from 476 */ + mfspr r3,SPRN_PVR + srwi r3,r3,16 + cmplwi cr0,r3,PVR_476FPE@h + beq head_start_47x + cmplwi cr0,r3,PVR_476@h + beq head_start_47x + cmplwi cr0,r3,PVR_476_ISS@h + beq head_start_47x +#endif /* CONFIG_PPC_47x */ + +/* + * In case the firmware didn't do it, we apply some workarounds + * that are good for all 440 core variants here + */ + mfspr r3,SPRN_CCR0 + rlwinm r3,r3,0,0,27 /* disable icache prefetch */ + isync + mtspr SPRN_CCR0,r3 + isync + sync + +/* + * Set up the initial MMU state for 44x + * + * We are still executing code at the virtual address + * mappings set by the firmware for the base of RAM. + * + * We first invalidate all TLB entries but the one + * we are running from. We then load the KERNELBASE + * mappings so we can begin to use kernel addresses + * natively and so the interrupt vector locations are + * permanently pinned (necessary since Book E + * implementations always have translation enabled). + * + * TODO: Use the known TLB entry we are running from to + * determine which physical region we are located + * in. This can be used to determine where in RAM + * (on a shared CPU system) or PCI memory space + * (on a DRAMless system) we are located. + * For now, we assume a perfect world which means + * we are located at the base of DRAM (physical 0). + */ + +/* + * Search TLB for entry that we are currently using. + * Invalidate all entries but the one we are using. + */ + /* Load our current PID->MMUCR TID and MSR IS->MMUCR STS */ + mfspr r3,SPRN_PID /* Get PID */ + mfmsr r4 /* Get MSR */ + andi. r4,r4,MSR_IS@l /* TS=1? */ + beq wmmucr /* If not, leave STS=0 */ + oris r3,r3,PPC44x_MMUCR_STS@h /* Set STS=1 */ +wmmucr: mtspr SPRN_MMUCR,r3 /* Put MMUCR */ + sync + + bcl 20,31,$+4 /* Find our address */ +invstr: mflr r5 /* Make it accessible */ + tlbsx r23,0,r5 /* Find entry we are in */ + li r4,0 /* Start at TLB entry 0 */ + li r3,0 /* Set PAGEID inval value */ +1: cmpw r23,r4 /* Is this our entry? */ + beq skpinv /* If so, skip the inval */ + tlbwe r3,r4,PPC44x_TLB_PAGEID /* If not, inval the entry */ +skpinv: addi r4,r4,1 /* Increment */ + cmpwi r4,64 /* Are we done? */ + bne 1b /* If not, repeat */ + isync /* If so, context change */ + +/* + * Configure and load pinned entry into TLB slot 63. + */ +#ifdef CONFIG_NONSTATIC_KERNEL + /* + * In case of a NONSTATIC_KERNEL we reuse the TLB XLAT + * entries of the initial mapping set by the boot loader. + * The XLAT entry is stored in r25 + */ + + /* Read the XLAT entry for our current mapping */ + tlbre r25,r23,PPC44x_TLB_XLAT + + lis r3,KERNELBASE@h + ori r3,r3,KERNELBASE@l + + /* Use our current RPN entry */ + mr r4,r25 +#else + + lis r3,PAGE_OFFSET@h + ori r3,r3,PAGE_OFFSET@l + + /* Kernel is at the base of RAM */ + li r4, 0 /* Load the kernel physical address */ +#endif + + /* Load the kernel PID = 0 */ + li r0,0 + mtspr SPRN_PID,r0 + sync + + /* Initialize MMUCR */ + li r5,0 + mtspr SPRN_MMUCR,r5 + sync + + /* pageid fields */ + clrrwi r3,r3,10 /* Mask off the effective page number */ + ori r3,r3,PPC44x_TLB_VALID | PPC44x_TLB_256M + + /* xlat fields */ + clrrwi r4,r4,10 /* Mask off the real page number */ + /* ERPN is 0 for first 4GB page */ + + /* attrib fields */ + /* Added guarded bit to protect against speculative loads/stores */ + li r5,0 + ori r5,r5,(PPC44x_TLB_SW | PPC44x_TLB_SR | PPC44x_TLB_SX | PPC44x_TLB_G) + + li r0,63 /* TLB slot 63 */ + + tlbwe r3,r0,PPC44x_TLB_PAGEID /* Load the pageid fields */ + tlbwe r4,r0,PPC44x_TLB_XLAT /* Load the translation fields */ + tlbwe r5,r0,PPC44x_TLB_ATTRIB /* Load the attrib/access fields */ + + /* Force context change */ + mfmsr r0 + mtspr SPRN_SRR1, r0 + lis r0,3f@h + ori r0,r0,3f@l + mtspr SPRN_SRR0,r0 + sync + rfi + + /* If necessary, invalidate original entry we used */ +3: cmpwi r23,63 + beq 4f + li r6,0 + tlbwe r6,r23,PPC44x_TLB_PAGEID + isync + +4: +#ifdef CONFIG_PPC_EARLY_DEBUG_44x + /* Add UART mapping for early debug. */ + + /* pageid fields */ + lis r3,PPC44x_EARLY_DEBUG_VIRTADDR@h + ori r3,r3,PPC44x_TLB_VALID|PPC44x_TLB_TS|PPC44x_TLB_64K + + /* xlat fields */ + lis r4,CONFIG_PPC_EARLY_DEBUG_44x_PHYSLOW@h + ori r4,r4,CONFIG_PPC_EARLY_DEBUG_44x_PHYSHIGH + + /* attrib fields */ + li r5,(PPC44x_TLB_SW|PPC44x_TLB_SR|PPC44x_TLB_I|PPC44x_TLB_G) + li r0,62 /* TLB slot 0 */ + + tlbwe r3,r0,PPC44x_TLB_PAGEID + tlbwe r4,r0,PPC44x_TLB_XLAT + tlbwe r5,r0,PPC44x_TLB_ATTRIB + + /* Force context change */ + isync +#endif /* CONFIG_PPC_EARLY_DEBUG_44x */ + + /* Establish the interrupt vector offsets */ + SET_IVOR(0, CriticalInput); + SET_IVOR(1, MachineCheck); + SET_IVOR(2, DataStorage); + SET_IVOR(3, InstructionStorage); + SET_IVOR(4, ExternalInput); + SET_IVOR(5, Alignment); + SET_IVOR(6, Program); + SET_IVOR(7, FloatingPointUnavailable); + SET_IVOR(8, SystemCall); + SET_IVOR(9, AuxillaryProcessorUnavailable); + SET_IVOR(10, Decrementer); + SET_IVOR(11, FixedIntervalTimer); + SET_IVOR(12, WatchdogTimer); + SET_IVOR(13, DataTLBError44x); + SET_IVOR(14, InstructionTLBError44x); + SET_IVOR(15, DebugCrit); + + b head_start_common + + +#ifdef CONFIG_PPC_47x + +#ifdef CONFIG_SMP + +/* Entry point for secondary 47x processors */ +_GLOBAL(start_secondary_47x) + mr r24,r3 /* CPU number */ + + bl init_cpu_state + + /* Now we need to bolt the rest of kernel memory which + * is done in C code. We must be careful because our task + * struct or our stack can (and will probably) be out + * of reach of the initial 256M TLB entry, so we use a + * small temporary stack in .bss for that. This works + * because only one CPU at a time can be in this code + */ + lis r1,temp_boot_stack@h + ori r1,r1,temp_boot_stack@l + addi r1,r1,1024-STACK_FRAME_OVERHEAD + li r0,0 + stw r0,0(r1) + bl mmu_init_secondary + + /* Now we can get our task struct and real stack pointer */ + + /* Get current's stack and current */ + lis r2,secondary_current@ha + lwz r2,secondary_current@l(r2) + lwz r1,TASK_STACK(r2) + + /* Current stack pointer */ + addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD + li r0,0 + stw r0,0(r1) + + /* Kernel stack for exception entry in SPRG3 */ + addi r4,r2,THREAD /* init task's THREAD */ + mtspr SPRN_SPRG3,r4 + + b start_secondary + +#endif /* CONFIG_SMP */ + +/* + * Set up the initial MMU state for 44x + * + * We are still executing code at the virtual address + * mappings set by the firmware for the base of RAM. + */ + +head_start_47x: + /* Load our current PID->MMUCR TID and MSR IS->MMUCR STS */ + mfspr r3,SPRN_PID /* Get PID */ + mfmsr r4 /* Get MSR */ + andi. r4,r4,MSR_IS@l /* TS=1? */ + beq 1f /* If not, leave STS=0 */ + oris r3,r3,PPC47x_MMUCR_STS@h /* Set STS=1 */ +1: mtspr SPRN_MMUCR,r3 /* Put MMUCR */ + sync + + /* Find the entry we are running from */ + bcl 20,31,$+4 +1: mflr r23 + tlbsx r23,0,r23 + tlbre r24,r23,0 + tlbre r25,r23,1 + tlbre r26,r23,2 + +/* + * Cleanup time + */ + + /* Initialize MMUCR */ + li r5,0 + mtspr SPRN_MMUCR,r5 + sync + +clear_all_utlb_entries: + + #; Set initial values. + + addis r3,0,0x8000 + addi r4,0,0 + addi r5,0,0 + b clear_utlb_entry + + #; Align the loop to speed things up. + + .align 6 + +clear_utlb_entry: + + tlbwe r4,r3,0 + tlbwe r5,r3,1 + tlbwe r5,r3,2 + addis r3,r3,0x2000 + cmpwi r3,0 + bne clear_utlb_entry + addis r3,0,0x8000 + addis r4,r4,0x100 + cmpwi r4,0 + bne clear_utlb_entry + + #; Restore original entry. + + oris r23,r23,0x8000 /* specify the way */ + tlbwe r24,r23,0 + tlbwe r25,r23,1 + tlbwe r26,r23,2 + +/* + * Configure and load pinned entry into TLB for the kernel core + */ + + lis r3,PAGE_OFFSET@h + ori r3,r3,PAGE_OFFSET@l + + /* Load the kernel PID = 0 */ + li r0,0 + mtspr SPRN_PID,r0 + sync + + /* Word 0 */ + clrrwi r3,r3,12 /* Mask off the effective page number */ + ori r3,r3,PPC47x_TLB0_VALID | PPC47x_TLB0_256M + + /* Word 1 - use r25. RPN is the same as the original entry */ + + /* Word 2 */ + li r5,0 + ori r5,r5,PPC47x_TLB2_S_RWX +#ifdef CONFIG_SMP + ori r5,r5,PPC47x_TLB2_M +#endif + + /* We write to way 0 and bolted 0 */ + lis r0,0x8800 + tlbwe r3,r0,0 + tlbwe r25,r0,1 + tlbwe r5,r0,2 + +/* + * Configure SSPCR, ISPCR and USPCR for now to search everything, we can fix + * them up later + */ + LOAD_REG_IMMEDIATE(r3, 0x9abcdef0) + mtspr SPRN_SSPCR,r3 + mtspr SPRN_USPCR,r3 + LOAD_REG_IMMEDIATE(r3, 0x12345670) + mtspr SPRN_ISPCR,r3 + + /* Force context change */ + mfmsr r0 + mtspr SPRN_SRR1, r0 + lis r0,3f@h + ori r0,r0,3f@l + mtspr SPRN_SRR0,r0 + sync + rfi + + /* Invalidate original entry we used */ +3: + rlwinm r24,r24,0,21,19 /* clear the "valid" bit */ + tlbwe r24,r23,0 + addi r24,0,0 + tlbwe r24,r23,1 + tlbwe r24,r23,2 + isync /* Clear out the shadow TLB entries */ + +#ifdef CONFIG_PPC_EARLY_DEBUG_44x + /* Add UART mapping for early debug. */ + + /* Word 0 */ + lis r3,PPC44x_EARLY_DEBUG_VIRTADDR@h + ori r3,r3,PPC47x_TLB0_VALID | PPC47x_TLB0_TS | PPC47x_TLB0_1M + + /* Word 1 */ + lis r4,CONFIG_PPC_EARLY_DEBUG_44x_PHYSLOW@h + ori r4,r4,CONFIG_PPC_EARLY_DEBUG_44x_PHYSHIGH + + /* Word 2 */ + li r5,(PPC47x_TLB2_S_RW | PPC47x_TLB2_IMG) + + /* Bolted in way 0, bolt slot 5, we -hope- we don't hit the same + * congruence class as the kernel, we need to make sure of it at + * some point + */ + lis r0,0x8d00 + tlbwe r3,r0,0 + tlbwe r4,r0,1 + tlbwe r5,r0,2 + + /* Force context change */ + isync +#endif /* CONFIG_PPC_EARLY_DEBUG_44x */ + + /* Establish the interrupt vector offsets */ + SET_IVOR(0, CriticalInput); + SET_IVOR(1, MachineCheckA); + SET_IVOR(2, DataStorage); + SET_IVOR(3, InstructionStorage); + SET_IVOR(4, ExternalInput); + SET_IVOR(5, Alignment); + SET_IVOR(6, Program); + SET_IVOR(7, FloatingPointUnavailable); + SET_IVOR(8, SystemCall); + SET_IVOR(9, AuxillaryProcessorUnavailable); + SET_IVOR(10, Decrementer); + SET_IVOR(11, FixedIntervalTimer); + SET_IVOR(12, WatchdogTimer); + SET_IVOR(13, DataTLBError47x); + SET_IVOR(14, InstructionTLBError47x); + SET_IVOR(15, DebugCrit); + + /* We configure icbi to invalidate 128 bytes at a time since the + * current 32-bit kernel code isn't too happy with icache != dcache + * block size. We also disable the BTAC as this can cause errors + * in some circumstances (see IBM Erratum 47). + */ + mfspr r3,SPRN_CCR0 + oris r3,r3,0x0020 + ori r3,r3,0x0040 + mtspr SPRN_CCR0,r3 + isync + +#endif /* CONFIG_PPC_47x */ + +/* + * Here we are back to code that is common between 44x and 47x + * + * We proceed to further kernel initialization and return to the + * main kernel entry + */ +head_start_common: + /* Establish the interrupt vector base */ + lis r4,interrupt_base@h /* IVPR only uses the high 16-bits */ + mtspr SPRN_IVPR,r4 + + /* + * If the kernel was loaded at a non-zero 256 MB page, we need to + * mask off the most significant 4 bits to get the relative address + * from the start of physical memory + */ + rlwinm r22,r22,0,4,31 + addis r22,r22,PAGE_OFFSET@h + mtlr r22 + isync + blr + +#ifdef CONFIG_SMP + .data + .align 12 +temp_boot_stack: + .space 1024 +#endif /* CONFIG_SMP */ diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S new file mode 100644 index 000000000..dedcc6fe2 --- /dev/null +++ b/arch/powerpc/kernel/head_64.S @@ -0,0 +1,1007 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * PowerPC version + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * + * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP + * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> + * Adapted for Power Macintosh by Paul Mackerras. + * Low-level exception handlers and MMU support + * rewritten by Paul Mackerras. + * Copyright (C) 1996 Paul Mackerras. + * + * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and + * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com + * + * This file contains the entry point for the 64-bit kernel along + * with some early initialization code common to all 64-bit powerpc + * variants. + */ + +#include <linux/threads.h> +#include <linux/init.h> +#include <asm/reg.h> +#include <asm/page.h> +#include <asm/mmu.h> +#include <asm/ppc_asm.h> +#include <asm/head-64.h> +#include <asm/asm-offsets.h> +#include <asm/bug.h> +#include <asm/cputable.h> +#include <asm/setup.h> +#include <asm/hvcall.h> +#include <asm/thread_info.h> +#include <asm/firmware.h> +#include <asm/page_64.h> +#include <asm/irqflags.h> +#include <asm/kvm_book3s_asm.h> +#include <asm/ptrace.h> +#include <asm/hw_irq.h> +#include <asm/cputhreads.h> +#include <asm/ppc-opcode.h> +#include <asm/export.h> +#include <asm/feature-fixups.h> +#ifdef CONFIG_PPC_BOOK3S +#include <asm/exception-64s.h> +#else +#include <asm/exception-64e.h> +#endif + +/* The physical memory is laid out such that the secondary processor + * spin code sits at 0x0000...0x00ff. On server, the vectors follow + * using the layout described in exceptions-64s.S + */ + +/* + * Entering into this code we make the following assumptions: + * + * For pSeries or server processors: + * 1. The MMU is off & open firmware is running in real mode. + * 2. The primary CPU enters at __start. + * 3. If the RTAS supports "query-cpu-stopped-state", then secondary + * CPUs will enter as directed by "start-cpu" RTAS call, which is + * generic_secondary_smp_init, with PIR in r3. + * 4. Else the secondary CPUs will enter at secondary_hold (0x60) as + * directed by the "start-cpu" RTS call, with PIR in r3. + * -or- For OPAL entry: + * 1. The MMU is off, processor in HV mode. + * 2. The primary CPU enters at 0 with device-tree in r3, OPAL base + * in r8, and entry in r9 for debugging purposes. + * 3. Secondary CPUs enter as directed by OPAL_START_CPU call, which + * is at generic_secondary_smp_init, with PIR in r3. + * + * For Book3E processors: + * 1. The MMU is on running in AS0 in a state defined in ePAPR + * 2. The kernel is entered at __start + */ + +OPEN_FIXED_SECTION(first_256B, 0x0, 0x100) +USE_FIXED_SECTION(first_256B) + /* + * Offsets are relative from the start of fixed section, and + * first_256B starts at 0. Offsets are a bit easier to use here + * than the fixed section entry macros. + */ + . = 0x0 +_GLOBAL(__start) + /* NOP this out unconditionally */ +BEGIN_FTR_SECTION + FIXUP_ENDIAN + b __start_initialization_multiplatform +END_FTR_SECTION(0, 1) + + /* Catch branch to 0 in real mode */ + trap + + /* Secondary processors spin on this value until it becomes non-zero. + * When non-zero, it contains the real address of the function the cpu + * should jump to. + */ + .balign 8 + .globl __secondary_hold_spinloop +__secondary_hold_spinloop: + .8byte 0x0 + + /* Secondary processors write this value with their cpu # */ + /* after they enter the spin loop immediately below. */ + .globl __secondary_hold_acknowledge +__secondary_hold_acknowledge: + .8byte 0x0 + +#ifdef CONFIG_RELOCATABLE + /* This flag is set to 1 by a loader if the kernel should run + * at the loaded address instead of the linked address. This + * is used by kexec-tools to keep the kdump kernel in the + * crash_kernel region. The loader is responsible for + * observing the alignment requirement. + */ + +#ifdef CONFIG_RELOCATABLE_TEST +#define RUN_AT_LOAD_DEFAULT 1 /* Test relocation, do not copy to 0 */ +#else +#define RUN_AT_LOAD_DEFAULT 0x72756e30 /* "run0" -- relocate to 0 by default */ +#endif + + /* Do not move this variable as kexec-tools knows about it. */ + . = 0x5c + .globl __run_at_load +__run_at_load: +DEFINE_FIXED_SYMBOL(__run_at_load, first_256B) + .long RUN_AT_LOAD_DEFAULT +#endif + + . = 0x60 +/* + * The following code is used to hold secondary processors + * in a spin loop after they have entered the kernel, but + * before the bulk of the kernel has been relocated. This code + * is relocated to physical address 0x60 before prom_init is run. + * All of it must fit below the first exception vector at 0x100. + * Use .globl here not _GLOBAL because we want __secondary_hold + * to be the actual text address, not a descriptor. + */ + .globl __secondary_hold +__secondary_hold: + FIXUP_ENDIAN +#ifndef CONFIG_PPC_BOOK3E_64 + mfmsr r24 + ori r24,r24,MSR_RI + mtmsrd r24 /* RI on */ +#endif + /* Grab our physical cpu number */ + mr r24,r3 + /* stash r4 for book3e */ + mr r25,r4 + + /* Tell the master cpu we're here */ + /* Relocation is off & we are located at an address less */ + /* than 0x100, so only need to grab low order offset. */ + std r24,(ABS_ADDR(__secondary_hold_acknowledge, first_256B))(0) + sync + + li r26,0 +#ifdef CONFIG_PPC_BOOK3E_64 + tovirt(r26,r26) +#endif + /* All secondary cpus wait here until told to start. */ +100: ld r12,(ABS_ADDR(__secondary_hold_spinloop, first_256B))(r26) + cmpdi 0,r12,0 + beq 100b + +#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC_CORE) +#ifdef CONFIG_PPC_BOOK3E_64 + tovirt(r12,r12) +#endif + mtctr r12 + mr r3,r24 + /* + * it may be the case that other platforms have r4 right to + * begin with, this gives us some safety in case it is not + */ +#ifdef CONFIG_PPC_BOOK3E_64 + mr r4,r25 +#else + li r4,0 +#endif + /* Make sure that patched code is visible */ + isync + bctr +#else +0: trap + EMIT_BUG_ENTRY 0b, __FILE__, __LINE__, 0 +#endif +CLOSE_FIXED_SECTION(first_256B) + +/* + * On server, we include the exception vectors code here as it + * relies on absolute addressing which is only possible within + * this compilation unit + */ +#ifdef CONFIG_PPC_BOOK3S +#include "exceptions-64s.S" +#else +OPEN_TEXT_SECTION(0x100) +#endif + +USE_TEXT_SECTION() + +#include "interrupt_64.S" + +#ifdef CONFIG_PPC_BOOK3E_64 +/* + * The booting_thread_hwid holds the thread id we want to boot in cpu + * hotplug case. It is set by cpu hotplug code, and is invalid by default. + * The thread id is the same as the initial value of SPRN_PIR[THREAD_ID] + * bit field. + */ + .globl booting_thread_hwid +booting_thread_hwid: + .long INVALID_THREAD_HWID + .align 3 +/* + * start a thread in the same core + * input parameters: + * r3 = the thread physical id + * r4 = the entry point where thread starts + */ +_GLOBAL(book3e_start_thread) + LOAD_REG_IMMEDIATE(r5, MSR_KERNEL) + cmpwi r3, 0 + beq 10f + cmpwi r3, 1 + beq 11f + /* If the thread id is invalid, just exit. */ + b 13f +10: + MTTMR(TMRN_IMSR0, 5) + MTTMR(TMRN_INIA0, 4) + b 12f +11: + MTTMR(TMRN_IMSR1, 5) + MTTMR(TMRN_INIA1, 4) +12: + isync + li r6, 1 + sld r6, r6, r3 + mtspr SPRN_TENS, r6 +13: + blr + +/* + * stop a thread in the same core + * input parameter: + * r3 = the thread physical id + */ +_GLOBAL(book3e_stop_thread) + cmpwi r3, 0 + beq 10f + cmpwi r3, 1 + beq 10f + /* If the thread id is invalid, just exit. */ + b 13f +10: + li r4, 1 + sld r4, r4, r3 + mtspr SPRN_TENC, r4 +13: + blr + +_GLOBAL(fsl_secondary_thread_init) + mfspr r4,SPRN_BUCSR + + /* Enable branch prediction */ + lis r3,BUCSR_INIT@h + ori r3,r3,BUCSR_INIT@l + mtspr SPRN_BUCSR,r3 + isync + + /* + * Fix PIR to match the linear numbering in the device tree. + * + * On e6500, the reset value of PIR uses the low three bits for + * the thread within a core, and the upper bits for the core + * number. There are two threads per core, so shift everything + * but the low bit right by two bits so that the cpu numbering is + * continuous. + * + * If the old value of BUCSR is non-zero, this thread has run + * before. Thus, we assume we are coming from kexec or a similar + * scenario, and PIR is already set to the correct value. This + * is a bit of a hack, but there are limited opportunities for + * getting information into the thread and the alternatives + * seemed like they'd be overkill. We can't tell just by looking + * at the old PIR value which state it's in, since the same value + * could be valid for one thread out of reset and for a different + * thread in Linux. + */ + + mfspr r3, SPRN_PIR + cmpwi r4,0 + bne 1f + rlwimi r3, r3, 30, 2, 30 + mtspr SPRN_PIR, r3 +1: + mr r24,r3 + + /* turn on 64-bit mode */ + bl enable_64b_mode + + /* get a valid TOC pointer, wherever we're mapped at */ + bl relative_toc + tovirt(r2,r2) + + /* Book3E initialization */ + mr r3,r24 + bl book3e_secondary_thread_init + b generic_secondary_common_init + +#endif /* CONFIG_PPC_BOOK3E_64 */ + +/* + * On pSeries and most other platforms, secondary processors spin + * in the following code. + * At entry, r3 = this processor's number (physical cpu id) + * + * On Book3E, r4 = 1 to indicate that the initial TLB entry for + * this core already exists (setup via some other mechanism such + * as SCOM before entry). + */ +_GLOBAL(generic_secondary_smp_init) + FIXUP_ENDIAN + mr r24,r3 + mr r25,r4 + + /* turn on 64-bit mode */ + bl enable_64b_mode + + /* get a valid TOC pointer, wherever we're mapped at */ + bl relative_toc + tovirt(r2,r2) + +#ifdef CONFIG_PPC_BOOK3E_64 + /* Book3E initialization */ + mr r3,r24 + mr r4,r25 + bl book3e_secondary_core_init + +/* + * After common core init has finished, check if the current thread is the + * one we wanted to boot. If not, start the specified thread and stop the + * current thread. + */ + LOAD_REG_ADDR(r4, booting_thread_hwid) + lwz r3, 0(r4) + li r5, INVALID_THREAD_HWID + cmpw r3, r5 + beq 20f + + /* + * The value of booting_thread_hwid has been stored in r3, + * so make it invalid. + */ + stw r5, 0(r4) + + /* + * Get the current thread id and check if it is the one we wanted. + * If not, start the one specified in booting_thread_hwid and stop + * the current thread. + */ + mfspr r8, SPRN_TIR + cmpw r3, r8 + beq 20f + + /* start the specified thread */ + LOAD_REG_ADDR(r5, fsl_secondary_thread_init) + ld r4, 0(r5) + bl book3e_start_thread + + /* stop the current thread */ + mr r3, r8 + bl book3e_stop_thread +10: + b 10b +20: +#endif + +generic_secondary_common_init: + /* Set up a paca value for this processor. Since we have the + * physical cpu id in r24, we need to search the pacas to find + * which logical id maps to our physical one. + */ +#ifndef CONFIG_SMP + b kexec_wait /* wait for next kernel if !SMP */ +#else + LOAD_REG_ADDR(r8, paca_ptrs) /* Load paca_ptrs pointe */ + ld r8,0(r8) /* Get base vaddr of array */ +#if (NR_CPUS == 1) || defined(CONFIG_FORCE_NR_CPUS) + LOAD_REG_IMMEDIATE(r7, NR_CPUS) +#else + LOAD_REG_ADDR(r7, nr_cpu_ids) /* Load nr_cpu_ids address */ + lwz r7,0(r7) /* also the max paca allocated */ +#endif + li r5,0 /* logical cpu id */ +1: + sldi r9,r5,3 /* get paca_ptrs[] index from cpu id */ + ldx r13,r9,r8 /* r13 = paca_ptrs[cpu id] */ + lhz r6,PACAHWCPUID(r13) /* Load HW procid from paca */ + cmpw r6,r24 /* Compare to our id */ + beq 2f + addi r5,r5,1 + cmpw r5,r7 /* Check if more pacas exist */ + blt 1b + + mr r3,r24 /* not found, copy phys to r3 */ + b kexec_wait /* next kernel might do better */ + +2: SET_PACA(r13) +#ifdef CONFIG_PPC_BOOK3E_64 + addi r12,r13,PACA_EXTLB /* and TLB exc frame in another */ + mtspr SPRN_SPRG_TLB_EXFRAME,r12 +#endif + + /* From now on, r24 is expected to be logical cpuid */ + mr r24,r5 + + /* Create a temp kernel stack for use before relocation is on. */ + ld r1,PACAEMERGSP(r13) + subi r1,r1,STACK_FRAME_OVERHEAD + + /* See if we need to call a cpu state restore handler */ + LOAD_REG_ADDR(r23, cur_cpu_spec) + ld r23,0(r23) + ld r12,CPU_SPEC_RESTORE(r23) + cmpdi 0,r12,0 + beq 3f +#ifdef CONFIG_PPC64_ELF_ABI_V1 + ld r12,0(r12) +#endif + mtctr r12 + bctrl + +3: LOAD_REG_ADDR(r3, spinning_secondaries) /* Decrement spinning_secondaries */ + lwarx r4,0,r3 + subi r4,r4,1 + stwcx. r4,0,r3 + bne 3b + isync + +4: HMT_LOW + lbz r23,PACAPROCSTART(r13) /* Test if this processor should */ + /* start. */ + cmpwi 0,r23,0 + beq 4b /* Loop until told to go */ + + sync /* order paca.run and cur_cpu_spec */ + isync /* In case code patching happened */ + + b __secondary_start +#endif /* SMP */ + +/* + * Turn the MMU off. + * Assumes we're mapped EA == RA if the MMU is on. + */ +#ifdef CONFIG_PPC_BOOK3S +__mmu_off: + mfmsr r3 + andi. r0,r3,MSR_IR|MSR_DR + beqlr + mflr r4 + andc r3,r3,r0 + mtspr SPRN_SRR0,r4 + mtspr SPRN_SRR1,r3 + sync + rfid + b . /* prevent speculative execution */ +#endif + + +/* + * Here is our main kernel entry point. We support currently 2 kind of entries + * depending on the value of r5. + * + * r5 != NULL -> OF entry, we go to prom_init, "legacy" parameter content + * in r3...r7 + * + * r5 == NULL -> kexec style entry. r3 is a physical pointer to the + * DT block, r4 is a physical pointer to the kernel itself + * + */ +__start_initialization_multiplatform: + /* Make sure we are running in 64 bits mode */ + bl enable_64b_mode + + /* Zero r13 (paca) so early program check / mce don't use it */ + li r13,0 + + /* Get TOC pointer (current runtime address) */ + bl relative_toc + + /* find out where we are now */ + bcl 20,31,$+4 +0: mflr r26 /* r26 = runtime addr here */ + addis r26,r26,(_stext - 0b)@ha + addi r26,r26,(_stext - 0b)@l /* current runtime base addr */ + + /* + * Are we booted from a PROM Of-type client-interface ? + */ + cmpldi cr0,r5,0 + beq 1f + b __boot_from_prom /* yes -> prom */ +1: + /* Save parameters */ + mr r31,r3 + mr r30,r4 +#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL + /* Save OPAL entry */ + mr r28,r8 + mr r29,r9 +#endif + +#ifdef CONFIG_PPC_BOOK3E_64 + bl start_initialization_book3e + b __after_prom_start +#else + /* Setup some critical 970 SPRs before switching MMU off */ + mfspr r0,SPRN_PVR + srwi r0,r0,16 + cmpwi r0,0x39 /* 970 */ + beq 1f + cmpwi r0,0x3c /* 970FX */ + beq 1f + cmpwi r0,0x44 /* 970MP */ + beq 1f + cmpwi r0,0x45 /* 970GX */ + bne 2f +1: bl __cpu_preinit_ppc970 +2: + + /* Switch off MMU if not already off */ + bl __mmu_off + b __after_prom_start +#endif /* CONFIG_PPC_BOOK3E_64 */ + +__REF +__boot_from_prom: +#ifdef CONFIG_PPC_OF_BOOT_TRAMPOLINE + /* Save parameters */ + mr r31,r3 + mr r30,r4 + mr r29,r5 + mr r28,r6 + mr r27,r7 + + /* + * Align the stack to 16-byte boundary + * Depending on the size and layout of the ELF sections in the initial + * boot binary, the stack pointer may be unaligned on PowerMac + */ + rldicr r1,r1,0,59 + +#ifdef CONFIG_RELOCATABLE + /* Relocate code for where we are now */ + mr r3,r26 + bl relocate +#endif + + /* Restore parameters */ + mr r3,r31 + mr r4,r30 + mr r5,r29 + mr r6,r28 + mr r7,r27 + + /* Do all of the interaction with OF client interface */ + mr r8,r26 + bl prom_init +#endif /* #CONFIG_PPC_OF_BOOT_TRAMPOLINE */ + + /* We never return. We also hit that trap if trying to boot + * from OF while CONFIG_PPC_OF_BOOT_TRAMPOLINE isn't selected */ + trap + .previous + +__after_prom_start: +#ifdef CONFIG_RELOCATABLE + /* process relocations for the final address of the kernel */ + lis r25,PAGE_OFFSET@highest /* compute virtual base of kernel */ + sldi r25,r25,32 +#if defined(CONFIG_PPC_BOOK3E_64) + tovirt(r26,r26) /* on booke, we already run at PAGE_OFFSET */ +#endif + lwz r7,(FIXED_SYMBOL_ABS_ADDR(__run_at_load))(r26) +#if defined(CONFIG_PPC_BOOK3E_64) + tophys(r26,r26) +#endif + cmplwi cr0,r7,1 /* flagged to stay where we are ? */ + bne 1f + add r25,r25,r26 +1: mr r3,r25 + bl relocate +#if defined(CONFIG_PPC_BOOK3E_64) + /* IVPR needs to be set after relocation. */ + bl init_core_book3e +#endif +#endif + +/* + * We need to run with _stext at physical address PHYSICAL_START. + * This will leave some code in the first 256B of + * real memory, which are reserved for software use. + * + * Note: This process overwrites the OF exception vectors. + */ + li r3,0 /* target addr */ +#ifdef CONFIG_PPC_BOOK3E_64 + tovirt(r3,r3) /* on booke, we already run at PAGE_OFFSET */ +#endif + mr. r4,r26 /* In some cases the loader may */ +#if defined(CONFIG_PPC_BOOK3E_64) + tovirt(r4,r4) +#endif + beq 9f /* have already put us at zero */ + li r6,0x100 /* Start offset, the first 0x100 */ + /* bytes were copied earlier. */ + +#ifdef CONFIG_RELOCATABLE +/* + * Check if the kernel has to be running as relocatable kernel based on the + * variable __run_at_load, if it is set the kernel is treated as relocatable + * kernel, otherwise it will be moved to PHYSICAL_START + */ +#if defined(CONFIG_PPC_BOOK3E_64) + tovirt(r26,r26) /* on booke, we already run at PAGE_OFFSET */ +#endif + lwz r7,(FIXED_SYMBOL_ABS_ADDR(__run_at_load))(r26) + cmplwi cr0,r7,1 + bne 3f + +#ifdef CONFIG_PPC_BOOK3E_64 + LOAD_REG_ADDR(r5, __end_interrupts) + LOAD_REG_ADDR(r11, _stext) + sub r5,r5,r11 +#else + /* just copy interrupts */ + LOAD_REG_IMMEDIATE_SYM(r5, r11, FIXED_SYMBOL_ABS_ADDR(__end_interrupts)) +#endif + b 5f +3: +#endif + /* # bytes of memory to copy */ + lis r5,(ABS_ADDR(copy_to_here, text))@ha + addi r5,r5,(ABS_ADDR(copy_to_here, text))@l + + bl copy_and_flush /* copy the first n bytes */ + /* this includes the code being */ + /* executed here. */ + /* Jump to the copy of this code that we just made */ + addis r8,r3,(ABS_ADDR(4f, text))@ha + addi r12,r8,(ABS_ADDR(4f, text))@l + mtctr r12 + bctr + +.balign 8 +p_end: .8byte _end - copy_to_here + +4: + /* + * Now copy the rest of the kernel up to _end, add + * _end - copy_to_here to the copy limit and run again. + */ + addis r8,r26,(ABS_ADDR(p_end, text))@ha + ld r8,(ABS_ADDR(p_end, text))@l(r8) + add r5,r5,r8 +5: bl copy_and_flush /* copy the rest */ + +9: b start_here_multiplatform + +/* + * Copy routine used to copy the kernel to start at physical address 0 + * and flush and invalidate the caches as needed. + * r3 = dest addr, r4 = source addr, r5 = copy limit, r6 = start offset + * on exit, r3, r4, r5 are unchanged, r6 is updated to be >= r5. + * + * Note: this routine *only* clobbers r0, r6 and lr + */ +_GLOBAL(copy_and_flush) + addi r5,r5,-8 + addi r6,r6,-8 +4: li r0,8 /* Use the smallest common */ + /* denominator cache line */ + /* size. This results in */ + /* extra cache line flushes */ + /* but operation is correct. */ + /* Can't get cache line size */ + /* from NACA as it is being */ + /* moved too. */ + + mtctr r0 /* put # words/line in ctr */ +3: addi r6,r6,8 /* copy a cache line */ + ldx r0,r6,r4 + stdx r0,r6,r3 + bdnz 3b + dcbst r6,r3 /* write it to memory */ + sync + icbi r6,r3 /* flush the icache line */ + cmpld 0,r6,r5 + blt 4b + sync + addi r5,r5,8 + addi r6,r6,8 + isync + blr + +_ASM_NOKPROBE_SYMBOL(copy_and_flush); /* Called in real mode */ + +.align 8 +copy_to_here: + +#ifdef CONFIG_SMP +#ifdef CONFIG_PPC_PMAC +/* + * On PowerMac, secondary processors starts from the reset vector, which + * is temporarily turned into a call to one of the functions below. + */ + .section ".text"; + .align 2 ; + + .globl __secondary_start_pmac_0 +__secondary_start_pmac_0: + /* NB the entries for cpus 0, 1, 2 must each occupy 8 bytes. */ + li r24,0 + b 1f + li r24,1 + b 1f + li r24,2 + b 1f + li r24,3 +1: + +_GLOBAL(pmac_secondary_start) + /* turn on 64-bit mode */ + bl enable_64b_mode + + li r0,0 + mfspr r3,SPRN_HID4 + rldimi r3,r0,40,23 /* clear bit 23 (rm_ci) */ + sync + mtspr SPRN_HID4,r3 + isync + sync + slbia + + /* get TOC pointer (real address) */ + bl relative_toc + tovirt(r2,r2) + + /* Copy some CPU settings from CPU 0 */ + bl __restore_cpu_ppc970 + + /* pSeries do that early though I don't think we really need it */ + mfmsr r3 + ori r3,r3,MSR_RI + mtmsrd r3 /* RI on */ + + /* Set up a paca value for this processor. */ + LOAD_REG_ADDR(r4,paca_ptrs) /* Load paca pointer */ + ld r4,0(r4) /* Get base vaddr of paca_ptrs array */ + sldi r5,r24,3 /* get paca_ptrs[] index from cpu id */ + ldx r13,r5,r4 /* r13 = paca_ptrs[cpu id] */ + SET_PACA(r13) /* Save vaddr of paca in an SPRG*/ + + /* Mark interrupts soft and hard disabled (they might be enabled + * in the PACA when doing hotplug) + */ + li r0,IRQS_DISABLED + stb r0,PACAIRQSOFTMASK(r13) + li r0,PACA_IRQ_HARD_DIS + stb r0,PACAIRQHAPPENED(r13) + + /* Create a temp kernel stack for use before relocation is on. */ + ld r1,PACAEMERGSP(r13) + subi r1,r1,STACK_FRAME_OVERHEAD + + b __secondary_start + +#endif /* CONFIG_PPC_PMAC */ + +/* + * This function is called after the master CPU has released the + * secondary processors. The execution environment is relocation off. + * The paca for this processor has the following fields initialized at + * this point: + * 1. Processor number + * 2. Segment table pointer (virtual address) + * On entry the following are set: + * r1 = stack pointer (real addr of temp stack) + * r24 = cpu# (in Linux terms) + * r13 = paca virtual address + * SPRG_PACA = paca virtual address + */ + .section ".text"; + .align 2 ; + + .globl __secondary_start +__secondary_start: + /* Set thread priority to MEDIUM */ + HMT_MEDIUM + + /* + * Do early setup for this CPU, in particular initialising the MMU so we + * can turn it on below. This is a call to C, which is OK, we're still + * running on the emergency stack. + */ + bl early_setup_secondary + + /* + * The primary has initialized our kernel stack for us in the paca, grab + * it and put it in r1. We must *not* use it until we turn on the MMU + * below, because it may not be inside the RMO. + */ + ld r1, PACAKSAVE(r13) + + /* Clear backchain so we get nice backtraces */ + li r7,0 + mtlr r7 + + /* Mark interrupts soft and hard disabled (they might be enabled + * in the PACA when doing hotplug) + */ + li r7,IRQS_DISABLED + stb r7,PACAIRQSOFTMASK(r13) + li r0,PACA_IRQ_HARD_DIS + stb r0,PACAIRQHAPPENED(r13) + + /* enable MMU and jump to start_secondary */ + LOAD_REG_ADDR(r3, start_secondary_prolog) + LOAD_REG_IMMEDIATE(r4, MSR_KERNEL) + + mtspr SPRN_SRR0,r3 + mtspr SPRN_SRR1,r4 + RFI_TO_KERNEL + b . /* prevent speculative execution */ + +/* + * Running with relocation on at this point. All we want to do is + * zero the stack back-chain pointer and get the TOC virtual address + * before going into C code. + */ +start_secondary_prolog: + LOAD_PACA_TOC() + li r3,0 + std r3,0(r1) /* Zero the stack frame pointer */ + bl start_secondary + b . +/* + * Reset stack pointer and call start_secondary + * to continue with online operation when woken up + * from cede in cpu offline. + */ +_GLOBAL(start_secondary_resume) + ld r1,PACAKSAVE(r13) /* Reload kernel stack pointer */ + li r3,0 + std r3,0(r1) /* Zero the stack frame pointer */ + bl start_secondary + b . +#endif + +/* + * This subroutine clobbers r11 and r12 + */ +enable_64b_mode: + mfmsr r11 /* grab the current MSR */ +#ifdef CONFIG_PPC_BOOK3E_64 + oris r11,r11,0x8000 /* CM bit set, we'll set ICM later */ + mtmsr r11 +#else /* CONFIG_PPC_BOOK3E_64 */ + LOAD_REG_IMMEDIATE(r12, MSR_64BIT) + or r11,r11,r12 + mtmsrd r11 + isync +#endif + blr + +/* + * This puts the TOC pointer into r2, offset by 0x8000 (as expected + * by the toolchain). It computes the correct value for wherever we + * are running at the moment, using position-independent code. + * + * Note: The compiler constructs pointers using offsets from the + * TOC in -mcmodel=medium mode. After we relocate to 0 but before + * the MMU is on we need our TOC to be a virtual address otherwise + * these pointers will be real addresses which may get stored and + * accessed later with the MMU on. We use tovirt() at the call + * sites to handle this. + */ +_GLOBAL(relative_toc) + mflr r0 + bcl 20,31,$+4 +0: mflr r11 + ld r2,(p_toc - 0b)(r11) + add r2,r2,r11 + mtlr r0 + blr + +.balign 8 +p_toc: .8byte .TOC. - 0b + +/* + * This is where the main kernel code starts. + */ +__REF +start_here_multiplatform: + /* set up the TOC */ + bl relative_toc + tovirt(r2,r2) + + /* Clear out the BSS. It may have been done in prom_init, + * already but that's irrelevant since prom_init will soon + * be detached from the kernel completely. Besides, we need + * to clear it now for kexec-style entry. + */ + LOAD_REG_ADDR(r11,__bss_stop) + LOAD_REG_ADDR(r8,__bss_start) + sub r11,r11,r8 /* bss size */ + addi r11,r11,7 /* round up to an even double word */ + srdi. r11,r11,3 /* shift right by 3 */ + beq 4f + addi r8,r8,-8 + li r0,0 + mtctr r11 /* zero this many doublewords */ +3: stdu r0,8(r8) + bdnz 3b +4: + +#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL + /* Setup OPAL entry */ + LOAD_REG_ADDR(r11, opal) + std r28,0(r11); + std r29,8(r11); +#endif + +#ifndef CONFIG_PPC_BOOK3E_64 + mfmsr r6 + ori r6,r6,MSR_RI + mtmsrd r6 /* RI on */ +#endif + +#ifdef CONFIG_RELOCATABLE + /* Save the physical address we're running at in kernstart_addr */ + LOAD_REG_ADDR(r4, kernstart_addr) + clrldi r0,r25,2 + std r0,0(r4) +#endif + + /* set up a stack pointer */ + LOAD_REG_ADDR(r3,init_thread_union) + LOAD_REG_IMMEDIATE(r1,THREAD_SIZE) + add r1,r3,r1 + li r0,0 + stdu r0,-STACK_FRAME_OVERHEAD(r1) + + /* + * Do very early kernel initializations, including initial hash table + * and SLB setup before we turn on relocation. + */ + +#ifdef CONFIG_KASAN + bl kasan_early_init +#endif + /* Restore parameters passed from prom_init/kexec */ + mr r3,r31 + LOAD_REG_ADDR(r12, DOTSYM(early_setup)) + mtctr r12 + bctrl /* also sets r13 and SPRG_PACA */ + + LOAD_REG_ADDR(r3, start_here_common) + ld r4,PACAKMSR(r13) + mtspr SPRN_SRR0,r3 + mtspr SPRN_SRR1,r4 + RFI_TO_KERNEL + b . /* prevent speculative execution */ + + /* This is where all platforms converge execution */ + +start_here_common: + /* relocation is on at this point */ + std r1,PACAKSAVE(r13) + + /* Load the TOC (virtual address) */ + LOAD_PACA_TOC() + + /* Mark interrupts soft and hard disabled (they might be enabled + * in the PACA when doing hotplug) + */ + li r0,IRQS_DISABLED + stb r0,PACAIRQSOFTMASK(r13) + li r0,PACA_IRQ_HARD_DIS + stb r0,PACAIRQHAPPENED(r13) + + /* Generic kernel entry */ + bl start_kernel + + /* Not reached */ +0: trap + EMIT_BUG_ENTRY 0b, __FILE__, __LINE__, 0 + .previous diff --git a/arch/powerpc/kernel/head_85xx.S b/arch/powerpc/kernel/head_85xx.S new file mode 100644 index 000000000..0e16aea78 --- /dev/null +++ b/arch/powerpc/kernel/head_85xx.S @@ -0,0 +1,1227 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Kernel execution entry point code. + * + * Copyright (c) 1995-1996 Gary Thomas <gdt@linuxppc.org> + * Initial PowerPC version. + * Copyright (c) 1996 Cort Dougan <cort@cs.nmt.edu> + * Rewritten for PReP + * Copyright (c) 1996 Paul Mackerras <paulus@cs.anu.edu.au> + * Low-level exception handers, MMU support, and rewrite. + * Copyright (c) 1997 Dan Malek <dmalek@jlc.net> + * PowerPC 8xx modifications. + * Copyright (c) 1998-1999 TiVo, Inc. + * PowerPC 403GCX modifications. + * Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu> + * PowerPC 403GCX/405GP modifications. + * Copyright 2000 MontaVista Software Inc. + * PPC405 modifications + * PowerPC 403GCX/405GP modifications. + * Author: MontaVista Software, Inc. + * frank_rowand@mvista.com or source@mvista.com + * debbie_chu@mvista.com + * Copyright 2002-2004 MontaVista Software, Inc. + * PowerPC 44x support, Matt Porter <mporter@kernel.crashing.org> + * Copyright 2004 Freescale Semiconductor, Inc + * PowerPC e500 modifications, Kumar Gala <galak@kernel.crashing.org> + */ + +#include <linux/init.h> +#include <linux/threads.h> +#include <linux/pgtable.h> +#include <asm/processor.h> +#include <asm/page.h> +#include <asm/mmu.h> +#include <asm/cputable.h> +#include <asm/thread_info.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/cache.h> +#include <asm/ptrace.h> +#include <asm/export.h> +#include <asm/feature-fixups.h> +#include "head_booke.h" + +/* As with the other PowerPC ports, it is expected that when code + * execution begins here, the following registers contain valid, yet + * optional, information: + * + * r3 - Board info structure pointer (DRAM, frequency, MAC address, etc.) + * r4 - Starting address of the init RAM disk + * r5 - Ending address of the init RAM disk + * r6 - Start of kernel command line string (e.g. "mem=128") + * r7 - End of kernel command line string + * + */ + __HEAD +_GLOBAL(_stext); +_GLOBAL(_start); + /* + * Reserve a word at a fixed location to store the address + * of abatron_pteptrs + */ + nop + + /* Translate device tree address to physical, save in r30/r31 */ + bl get_phys_addr + mr r30,r3 + mr r31,r4 + + li r25,0 /* phys kernel start (low) */ + li r24,0 /* CPU number */ + li r23,0 /* phys kernel start (high) */ + +#ifdef CONFIG_RELOCATABLE + LOAD_REG_ADDR_PIC(r3, _stext) /* Get our current runtime base */ + + /* Translate _stext address to physical, save in r23/r25 */ + bl get_phys_addr + mr r23,r3 + mr r25,r4 + + bcl 20,31,$+4 +0: mflr r8 + addis r3,r8,(is_second_reloc - 0b)@ha + lwz r19,(is_second_reloc - 0b)@l(r3) + + /* Check if this is the second relocation. */ + cmpwi r19,1 + bne 1f + + /* + * For the second relocation, we already get the real memstart_addr + * from device tree. So we will map PAGE_OFFSET to memstart_addr, + * then the virtual address of start kernel should be: + * PAGE_OFFSET + (kernstart_addr - memstart_addr) + * Since the offset between kernstart_addr and memstart_addr should + * never be beyond 1G, so we can just use the lower 32bit of them + * for the calculation. + */ + lis r3,PAGE_OFFSET@h + + addis r4,r8,(kernstart_addr - 0b)@ha + addi r4,r4,(kernstart_addr - 0b)@l + lwz r5,4(r4) + + addis r6,r8,(memstart_addr - 0b)@ha + addi r6,r6,(memstart_addr - 0b)@l + lwz r7,4(r6) + + subf r5,r7,r5 + add r3,r3,r5 + b 2f + +1: + /* + * We have the runtime (virtual) address of our base. + * We calculate our shift of offset from a 64M page. + * We could map the 64M page we belong to at PAGE_OFFSET and + * get going from there. + */ + lis r4,KERNELBASE@h + ori r4,r4,KERNELBASE@l + rlwinm r6,r25,0,0x3ffffff /* r6 = PHYS_START % 64M */ + rlwinm r5,r4,0,0x3ffffff /* r5 = KERNELBASE % 64M */ + subf r3,r5,r6 /* r3 = r6 - r5 */ + add r3,r4,r3 /* Required Virtual Address */ + +2: bl relocate + + /* + * For the second relocation, we already set the right tlb entries + * for the kernel space, so skip the code in 85xx_entry_mapping.S + */ + cmpwi r19,1 + beq set_ivor +#endif + +/* We try to not make any assumptions about how the boot loader + * setup or used the TLBs. We invalidate all mappings from the + * boot loader and load a single entry in TLB1[0] to map the + * first 64M of kernel memory. Any boot info passed from the + * bootloader needs to live in this first 64M. + * + * Requirement on bootloader: + * - The page we're executing in needs to reside in TLB1 and + * have IPROT=1. If not an invalidate broadcast could + * evict the entry we're currently executing in. + * + * r3 = Index of TLB1 were executing in + * r4 = Current MSR[IS] + * r5 = Index of TLB1 temp mapping + * + * Later in mapin_ram we will correctly map lowmem, and resize TLB1[0] + * if needed + */ + +_GLOBAL(__early_start) + LOAD_REG_ADDR_PIC(r20, kernstart_virt_addr) + lwz r20,0(r20) + +#define ENTRY_MAPPING_BOOT_SETUP +#include "85xx_entry_mapping.S" +#undef ENTRY_MAPPING_BOOT_SETUP + +set_ivor: + /* Establish the interrupt vector offsets */ + SET_IVOR(0, CriticalInput); + SET_IVOR(1, MachineCheck); + SET_IVOR(2, DataStorage); + SET_IVOR(3, InstructionStorage); + SET_IVOR(4, ExternalInput); + SET_IVOR(5, Alignment); + SET_IVOR(6, Program); + SET_IVOR(7, FloatingPointUnavailable); + SET_IVOR(8, SystemCall); + SET_IVOR(9, AuxillaryProcessorUnavailable); + SET_IVOR(10, Decrementer); + SET_IVOR(11, FixedIntervalTimer); + SET_IVOR(12, WatchdogTimer); + SET_IVOR(13, DataTLBError); + SET_IVOR(14, InstructionTLBError); + SET_IVOR(15, DebugCrit); + + /* Establish the interrupt vector base */ + lis r4,interrupt_base@h /* IVPR only uses the high 16-bits */ + mtspr SPRN_IVPR,r4 + + /* Setup the defaults for TLB entries */ + li r2,(MAS4_TSIZED(BOOK3E_PAGESZ_4K))@l + mtspr SPRN_MAS4, r2 + +#if !defined(CONFIG_BDI_SWITCH) + /* + * The Abatron BDI JTAG debugger does not tolerate others + * mucking with the debug registers. + */ + lis r2,DBCR0_IDM@h + mtspr SPRN_DBCR0,r2 + isync + /* clear any residual debug events */ + li r2,-1 + mtspr SPRN_DBSR,r2 +#endif + +#ifdef CONFIG_SMP + /* Check to see if we're the second processor, and jump + * to the secondary_start code if so + */ + LOAD_REG_ADDR_PIC(r24, boot_cpuid) + lwz r24, 0(r24) + cmpwi r24, -1 + mfspr r24,SPRN_PIR + bne __secondary_start +#endif + + /* + * This is where the main kernel code starts. + */ + + /* ptr to current */ + lis r2,init_task@h + ori r2,r2,init_task@l + + /* ptr to current thread */ + addi r4,r2,THREAD /* init task's THREAD */ + mtspr SPRN_SPRG_THREAD,r4 + + /* stack */ + lis r1,init_thread_union@h + ori r1,r1,init_thread_union@l + li r0,0 + stwu r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1) + +#ifdef CONFIG_SMP + stw r24, TASK_CPU(r2) +#endif + + bl early_init + +#ifdef CONFIG_KASAN + bl kasan_early_init +#endif +#ifdef CONFIG_RELOCATABLE + mr r3,r30 + mr r4,r31 +#ifdef CONFIG_PHYS_64BIT + mr r5,r23 + mr r6,r25 +#else + mr r5,r25 +#endif + bl relocate_init +#endif + +#ifdef CONFIG_DYNAMIC_MEMSTART + lis r3,kernstart_addr@ha + la r3,kernstart_addr@l(r3) +#ifdef CONFIG_PHYS_64BIT + stw r23,0(r3) + stw r25,4(r3) +#else + stw r25,0(r3) +#endif +#endif + +/* + * Decide what sort of machine this is and initialize the MMU. + */ + mr r3,r30 + mr r4,r31 + bl machine_init + bl MMU_init + + /* Setup PTE pointers for the Abatron bdiGDB */ + lis r6, swapper_pg_dir@h + ori r6, r6, swapper_pg_dir@l + lis r5, abatron_pteptrs@h + ori r5, r5, abatron_pteptrs@l + lis r3, kernstart_virt_addr@ha + lwz r4, kernstart_virt_addr@l(r3) + stw r5, 0(r4) /* Save abatron_pteptrs at a fixed location */ + stw r6, 0(r5) + + /* Let's move on */ + lis r4,start_kernel@h + ori r4,r4,start_kernel@l + lis r3,MSR_KERNEL@h + ori r3,r3,MSR_KERNEL@l + mtspr SPRN_SRR0,r4 + mtspr SPRN_SRR1,r3 + rfi /* change context and jump to start_kernel */ + +/* Macros to hide the PTE size differences + * + * FIND_PTE -- walks the page tables given EA & pgdir pointer + * r10 -- EA of fault + * r11 -- PGDIR pointer + * r12 -- free + * label 2: is the bailout case + * + * if we find the pte (fall through): + * r11 is low pte word + * r12 is pointer to the pte + * r10 is the pshift from the PGD, if we're a hugepage + */ +#ifdef CONFIG_PTE_64BIT +#ifdef CONFIG_HUGETLB_PAGE +#define FIND_PTE \ + rlwinm r12, r10, 13, 19, 29; /* Compute pgdir/pmd offset */ \ + lwzx r11, r12, r11; /* Get pgd/pmd entry */ \ + rlwinm. r12, r11, 0, 0, 20; /* Extract pt base address */ \ + blt 1000f; /* Normal non-huge page */ \ + beq 2f; /* Bail if no table */ \ + oris r11, r11, PD_HUGE@h; /* Put back address bit */ \ + andi. r10, r11, HUGEPD_SHIFT_MASK@l; /* extract size field */ \ + xor r12, r10, r11; /* drop size bits from pointer */ \ + b 1001f; \ +1000: rlwimi r12, r10, 23, 20, 28; /* Compute pte address */ \ + li r10, 0; /* clear r10 */ \ +1001: lwz r11, 4(r12); /* Get pte entry */ +#else +#define FIND_PTE \ + rlwinm r12, r10, 13, 19, 29; /* Compute pgdir/pmd offset */ \ + lwzx r11, r12, r11; /* Get pgd/pmd entry */ \ + rlwinm. r12, r11, 0, 0, 20; /* Extract pt base address */ \ + beq 2f; /* Bail if no table */ \ + rlwimi r12, r10, 23, 20, 28; /* Compute pte address */ \ + lwz r11, 4(r12); /* Get pte entry */ +#endif /* HUGEPAGE */ +#else /* !PTE_64BIT */ +#define FIND_PTE \ + rlwimi r11, r10, 12, 20, 29; /* Create L1 (pgdir/pmd) address */ \ + lwz r11, 0(r11); /* Get L1 entry */ \ + rlwinm. r12, r11, 0, 0, 19; /* Extract L2 (pte) base address */ \ + beq 2f; /* Bail if no table */ \ + rlwimi r12, r10, 22, 20, 29; /* Compute PTE address */ \ + lwz r11, 0(r12); /* Get Linux PTE */ +#endif + +/* + * Interrupt vector entry code + * + * The Book E MMUs are always on so we don't need to handle + * interrupts in real mode as with previous PPC processors. In + * this case we handle interrupts in the kernel virtual address + * space. + * + * Interrupt vectors are dynamically placed relative to the + * interrupt prefix as determined by the address of interrupt_base. + * The interrupt vectors offsets are programmed using the labels + * for each interrupt vector entry. + * + * Interrupt vectors must be aligned on a 16 byte boundary. + * We align on a 32 byte cache line boundary for good measure. + */ + +interrupt_base: + /* Critical Input Interrupt */ + CRITICAL_EXCEPTION(0x0100, CRITICAL, CriticalInput, unknown_exception) + + /* Machine Check Interrupt */ + MCHECK_EXCEPTION(0x0200, MachineCheck, machine_check_exception) + + /* Data Storage Interrupt */ + START_EXCEPTION(DataStorage) + NORMAL_EXCEPTION_PROLOG(0x300, DATA_STORAGE) + mfspr r5,SPRN_ESR /* Grab the ESR, save it */ + stw r5,_ESR(r11) + mfspr r4,SPRN_DEAR /* Grab the DEAR, save it */ + stw r4, _DEAR(r11) + andis. r10,r5,(ESR_ILK|ESR_DLK)@h + bne 1f + prepare_transfer_to_handler + bl do_page_fault + b interrupt_return +1: + prepare_transfer_to_handler + bl CacheLockingException + b interrupt_return + + /* Instruction Storage Interrupt */ + INSTRUCTION_STORAGE_EXCEPTION + + /* External Input Interrupt */ + EXCEPTION(0x0500, EXTERNAL, ExternalInput, do_IRQ) + + /* Alignment Interrupt */ + ALIGNMENT_EXCEPTION + + /* Program Interrupt */ + PROGRAM_EXCEPTION + + /* Floating Point Unavailable Interrupt */ +#ifdef CONFIG_PPC_FPU + FP_UNAVAILABLE_EXCEPTION +#else + EXCEPTION(0x0800, FP_UNAVAIL, FloatingPointUnavailable, emulation_assist_interrupt) +#endif + + /* System Call Interrupt */ + START_EXCEPTION(SystemCall) + SYSCALL_ENTRY 0xc00 BOOKE_INTERRUPT_SYSCALL SPRN_SRR1 + + /* Auxiliary Processor Unavailable Interrupt */ + EXCEPTION(0x2900, AP_UNAVAIL, AuxillaryProcessorUnavailable, unknown_exception) + + /* Decrementer Interrupt */ + DECREMENTER_EXCEPTION + + /* Fixed Internal Timer Interrupt */ + /* TODO: Add FIT support */ + EXCEPTION(0x3100, FIT, FixedIntervalTimer, unknown_exception) + + /* Watchdog Timer Interrupt */ +#ifdef CONFIG_BOOKE_WDT + CRITICAL_EXCEPTION(0x3200, WATCHDOG, WatchdogTimer, WatchdogException) +#else + CRITICAL_EXCEPTION(0x3200, WATCHDOG, WatchdogTimer, unknown_exception) +#endif + + /* Data TLB Error Interrupt */ + START_EXCEPTION(DataTLBError) + mtspr SPRN_SPRG_WSCRATCH0, r10 /* Save some working registers */ + mfspr r10, SPRN_SPRG_THREAD + stw r11, THREAD_NORMSAVE(0)(r10) +#ifdef CONFIG_KVM_BOOKE_HV +BEGIN_FTR_SECTION + mfspr r11, SPRN_SRR1 +END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV) +#endif + stw r12, THREAD_NORMSAVE(1)(r10) + stw r13, THREAD_NORMSAVE(2)(r10) + mfcr r13 + stw r13, THREAD_NORMSAVE(3)(r10) + DO_KVM BOOKE_INTERRUPT_DTLB_MISS SPRN_SRR1 +START_BTB_FLUSH_SECTION + mfspr r11, SPRN_SRR1 + andi. r10,r11,MSR_PR + beq 1f + BTB_FLUSH(r10) +1: +END_BTB_FLUSH_SECTION + mfspr r10, SPRN_DEAR /* Get faulting address */ + + /* If we are faulting a kernel address, we have to use the + * kernel page tables. + */ + lis r11, PAGE_OFFSET@h + cmplw 5, r10, r11 + blt 5, 3f + lis r11, swapper_pg_dir@h + ori r11, r11, swapper_pg_dir@l + + mfspr r12,SPRN_MAS1 /* Set TID to 0 */ + rlwinm r12,r12,0,16,1 + mtspr SPRN_MAS1,r12 + + b 4f + + /* Get the PGD for the current thread */ +3: + mfspr r11,SPRN_SPRG_THREAD + lwz r11,PGDIR(r11) + +#ifdef CONFIG_PPC_KUAP + mfspr r12, SPRN_MAS1 + rlwinm. r12,r12,0,0x3fff0000 + beq 2f /* KUAP fault */ +#endif + +4: + /* Mask of required permission bits. Note that while we + * do copy ESR:ST to _PAGE_RW position as trying to write + * to an RO page is pretty common, we don't do it with + * _PAGE_DIRTY. We could do it, but it's a fairly rare + * event so I'd rather take the overhead when it happens + * rather than adding an instruction here. We should measure + * whether the whole thing is worth it in the first place + * as we could avoid loading SPRN_ESR completely in the first + * place... + * + * TODO: Is it worth doing that mfspr & rlwimi in the first + * place or can we save a couple of instructions here ? + */ + mfspr r12,SPRN_ESR +#ifdef CONFIG_PTE_64BIT + li r13,_PAGE_PRESENT + oris r13,r13,_PAGE_ACCESSED@h +#else + li r13,_PAGE_PRESENT|_PAGE_ACCESSED +#endif + rlwimi r13,r12,11,29,29 + + FIND_PTE + andc. r13,r13,r11 /* Check permission */ + +#ifdef CONFIG_PTE_64BIT +#ifdef CONFIG_SMP + subf r13,r11,r12 /* create false data dep */ + lwzx r13,r11,r13 /* Get upper pte bits */ +#else + lwz r13,0(r12) /* Get upper pte bits */ +#endif +#endif + + bne 2f /* Bail if permission/valid mismatch */ + + /* Jump to common tlb load */ + b finish_tlb_load +2: + /* The bailout. Restore registers to pre-exception conditions + * and call the heavyweights to help us out. + */ + mfspr r10, SPRN_SPRG_THREAD + lwz r11, THREAD_NORMSAVE(3)(r10) + mtcr r11 + lwz r13, THREAD_NORMSAVE(2)(r10) + lwz r12, THREAD_NORMSAVE(1)(r10) + lwz r11, THREAD_NORMSAVE(0)(r10) + mfspr r10, SPRN_SPRG_RSCRATCH0 + b DataStorage + + /* Instruction TLB Error Interrupt */ + /* + * Nearly the same as above, except we get our + * information from different registers and bailout + * to a different point. + */ + START_EXCEPTION(InstructionTLBError) + mtspr SPRN_SPRG_WSCRATCH0, r10 /* Save some working registers */ + mfspr r10, SPRN_SPRG_THREAD + stw r11, THREAD_NORMSAVE(0)(r10) +#ifdef CONFIG_KVM_BOOKE_HV +BEGIN_FTR_SECTION + mfspr r11, SPRN_SRR1 +END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV) +#endif + stw r12, THREAD_NORMSAVE(1)(r10) + stw r13, THREAD_NORMSAVE(2)(r10) + mfcr r13 + stw r13, THREAD_NORMSAVE(3)(r10) + DO_KVM BOOKE_INTERRUPT_ITLB_MISS SPRN_SRR1 +START_BTB_FLUSH_SECTION + mfspr r11, SPRN_SRR1 + andi. r10,r11,MSR_PR + beq 1f + BTB_FLUSH(r10) +1: +END_BTB_FLUSH_SECTION + + mfspr r10, SPRN_SRR0 /* Get faulting address */ + + /* If we are faulting a kernel address, we have to use the + * kernel page tables. + */ + lis r11, PAGE_OFFSET@h + cmplw 5, r10, r11 + blt 5, 3f + lis r11, swapper_pg_dir@h + ori r11, r11, swapper_pg_dir@l + + mfspr r12,SPRN_MAS1 /* Set TID to 0 */ + rlwinm r12,r12,0,16,1 + mtspr SPRN_MAS1,r12 + + /* Make up the required permissions for kernel code */ +#ifdef CONFIG_PTE_64BIT + li r13,_PAGE_PRESENT | _PAGE_BAP_SX + oris r13,r13,_PAGE_ACCESSED@h +#else + li r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC +#endif + b 4f + + /* Get the PGD for the current thread */ +3: + mfspr r11,SPRN_SPRG_THREAD + lwz r11,PGDIR(r11) + +#ifdef CONFIG_PPC_KUAP + mfspr r12, SPRN_MAS1 + rlwinm. r12,r12,0,0x3fff0000 + beq 2f /* KUAP fault */ +#endif + + /* Make up the required permissions for user code */ +#ifdef CONFIG_PTE_64BIT + li r13,_PAGE_PRESENT | _PAGE_BAP_UX + oris r13,r13,_PAGE_ACCESSED@h +#else + li r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC +#endif + +4: + FIND_PTE + andc. r13,r13,r11 /* Check permission */ + +#ifdef CONFIG_PTE_64BIT +#ifdef CONFIG_SMP + subf r13,r11,r12 /* create false data dep */ + lwzx r13,r11,r13 /* Get upper pte bits */ +#else + lwz r13,0(r12) /* Get upper pte bits */ +#endif +#endif + + bne 2f /* Bail if permission mismatch */ + + /* Jump to common TLB load point */ + b finish_tlb_load + +2: + /* The bailout. Restore registers to pre-exception conditions + * and call the heavyweights to help us out. + */ + mfspr r10, SPRN_SPRG_THREAD + lwz r11, THREAD_NORMSAVE(3)(r10) + mtcr r11 + lwz r13, THREAD_NORMSAVE(2)(r10) + lwz r12, THREAD_NORMSAVE(1)(r10) + lwz r11, THREAD_NORMSAVE(0)(r10) + mfspr r10, SPRN_SPRG_RSCRATCH0 + b InstructionStorage + +/* Define SPE handlers for e500v2 */ +#ifdef CONFIG_SPE + /* SPE Unavailable */ + START_EXCEPTION(SPEUnavailable) + NORMAL_EXCEPTION_PROLOG(0x2010, SPE_UNAVAIL) + beq 1f + bl load_up_spe + b fast_exception_return +1: prepare_transfer_to_handler + bl KernelSPE + b interrupt_return +#elif defined(CONFIG_SPE_POSSIBLE) + EXCEPTION(0x2020, SPE_UNAVAIL, SPEUnavailable, unknown_exception) +#endif /* CONFIG_SPE_POSSIBLE */ + + /* SPE Floating Point Data */ +#ifdef CONFIG_SPE + START_EXCEPTION(SPEFloatingPointData) + NORMAL_EXCEPTION_PROLOG(0x2030, SPE_FP_DATA) + prepare_transfer_to_handler + bl SPEFloatingPointException + REST_NVGPRS(r1) + b interrupt_return + + /* SPE Floating Point Round */ + START_EXCEPTION(SPEFloatingPointRound) + NORMAL_EXCEPTION_PROLOG(0x2050, SPE_FP_ROUND) + prepare_transfer_to_handler + bl SPEFloatingPointRoundException + REST_NVGPRS(r1) + b interrupt_return +#elif defined(CONFIG_SPE_POSSIBLE) + EXCEPTION(0x2040, SPE_FP_DATA, SPEFloatingPointData, unknown_exception) + EXCEPTION(0x2050, SPE_FP_ROUND, SPEFloatingPointRound, unknown_exception) +#endif /* CONFIG_SPE_POSSIBLE */ + + + /* Performance Monitor */ + EXCEPTION(0x2060, PERFORMANCE_MONITOR, PerformanceMonitor, \ + performance_monitor_exception) + + EXCEPTION(0x2070, DOORBELL, Doorbell, doorbell_exception) + + CRITICAL_EXCEPTION(0x2080, DOORBELL_CRITICAL, \ + CriticalDoorbell, unknown_exception) + + /* Debug Interrupt */ + DEBUG_DEBUG_EXCEPTION + DEBUG_CRIT_EXCEPTION + + GUEST_DOORBELL_EXCEPTION + + CRITICAL_EXCEPTION(0, GUEST_DBELL_CRIT, CriticalGuestDoorbell, \ + unknown_exception) + + /* Hypercall */ + EXCEPTION(0, HV_SYSCALL, Hypercall, unknown_exception) + + /* Embedded Hypervisor Privilege */ + EXCEPTION(0, HV_PRIV, Ehvpriv, unknown_exception) + +interrupt_end: + +/* + * Local functions + */ + +/* + * Both the instruction and data TLB miss get to this + * point to load the TLB. + * r10 - tsize encoding (if HUGETLB_PAGE) or available to use + * r11 - TLB (info from Linux PTE) + * r12 - available to use + * r13 - upper bits of PTE (if PTE_64BIT) or available to use + * CR5 - results of addr >= PAGE_OFFSET + * MAS0, MAS1 - loaded with proper value when we get here + * MAS2, MAS3 - will need additional info from Linux PTE + * Upon exit, we reload everything and RFI. + */ +finish_tlb_load: +#ifdef CONFIG_HUGETLB_PAGE + cmpwi 6, r10, 0 /* check for huge page */ + beq 6, finish_tlb_load_cont /* !huge */ + + /* Alas, we need more scratch registers for hugepages */ + mfspr r12, SPRN_SPRG_THREAD + stw r14, THREAD_NORMSAVE(4)(r12) + stw r15, THREAD_NORMSAVE(5)(r12) + stw r16, THREAD_NORMSAVE(6)(r12) + stw r17, THREAD_NORMSAVE(7)(r12) + + /* Get the next_tlbcam_idx percpu var */ +#ifdef CONFIG_SMP + lwz r15, TASK_CPU-THREAD(r12) + lis r14, __per_cpu_offset@h + ori r14, r14, __per_cpu_offset@l + rlwinm r15, r15, 2, 0, 29 + lwzx r16, r14, r15 +#else + li r16, 0 +#endif + lis r17, next_tlbcam_idx@h + ori r17, r17, next_tlbcam_idx@l + add r17, r17, r16 /* r17 = *next_tlbcam_idx */ + lwz r15, 0(r17) /* r15 = next_tlbcam_idx */ + + lis r14, MAS0_TLBSEL(1)@h /* select TLB1 (TLBCAM) */ + rlwimi r14, r15, 16, 4, 15 /* next_tlbcam_idx entry */ + mtspr SPRN_MAS0, r14 + + /* Extract TLB1CFG(NENTRY) */ + mfspr r16, SPRN_TLB1CFG + andi. r16, r16, 0xfff + + /* Update next_tlbcam_idx, wrapping when necessary */ + addi r15, r15, 1 + cmpw r15, r16 + blt 100f + lis r14, tlbcam_index@h + ori r14, r14, tlbcam_index@l + lwz r15, 0(r14) +100: stw r15, 0(r17) + + /* + * Calc MAS1_TSIZE from r10 (which has pshift encoded) + * tlb_enc = (pshift - 10). + */ + subi r15, r10, 10 + mfspr r16, SPRN_MAS1 + rlwimi r16, r15, 7, 20, 24 + mtspr SPRN_MAS1, r16 + + /* copy the pshift for use later */ + mr r14, r10 + + /* fall through */ + +#endif /* CONFIG_HUGETLB_PAGE */ + + /* + * We set execute, because we don't have the granularity to + * properly set this at the page level (Linux problem). + * Many of these bits are software only. Bits we don't set + * here we (properly should) assume have the appropriate value. + */ +finish_tlb_load_cont: +#ifdef CONFIG_PTE_64BIT + rlwinm r12, r11, 32-2, 26, 31 /* Move in perm bits */ + andi. r10, r11, _PAGE_DIRTY + bne 1f + li r10, MAS3_SW | MAS3_UW + andc r12, r12, r10 +1: rlwimi r12, r13, 20, 0, 11 /* grab RPN[32:43] */ + rlwimi r12, r11, 20, 12, 19 /* grab RPN[44:51] */ +2: mtspr SPRN_MAS3, r12 +BEGIN_MMU_FTR_SECTION + srwi r10, r13, 12 /* grab RPN[12:31] */ + mtspr SPRN_MAS7, r10 +END_MMU_FTR_SECTION_IFSET(MMU_FTR_BIG_PHYS) +#else + li r10, (_PAGE_EXEC | _PAGE_PRESENT) + mr r13, r11 + rlwimi r10, r11, 31, 29, 29 /* extract _PAGE_DIRTY into SW */ + and r12, r11, r10 + andi. r10, r11, _PAGE_USER /* Test for _PAGE_USER */ + slwi r10, r12, 1 + or r10, r10, r12 + rlwinm r10, r10, 0, ~_PAGE_EXEC /* Clear SX on user pages */ + iseleq r12, r12, r10 + rlwimi r13, r12, 0, 20, 31 /* Get RPN from PTE, merge w/ perms */ + mtspr SPRN_MAS3, r13 +#endif + + mfspr r12, SPRN_MAS2 +#ifdef CONFIG_PTE_64BIT + rlwimi r12, r11, 32-19, 27, 31 /* extract WIMGE from pte */ +#else + rlwimi r12, r11, 26, 27, 31 /* extract WIMGE from pte */ +#endif +#ifdef CONFIG_HUGETLB_PAGE + beq 6, 3f /* don't mask if page isn't huge */ + li r13, 1 + slw r13, r13, r14 + subi r13, r13, 1 + rlwinm r13, r13, 0, 0, 19 /* bottom bits used for WIMGE/etc */ + andc r12, r12, r13 /* mask off ea bits within the page */ +#endif +3: mtspr SPRN_MAS2, r12 + +tlb_write_entry: + tlbwe + + /* Done...restore registers and get out of here. */ + mfspr r10, SPRN_SPRG_THREAD +#ifdef CONFIG_HUGETLB_PAGE + beq 6, 8f /* skip restore for 4k page faults */ + lwz r14, THREAD_NORMSAVE(4)(r10) + lwz r15, THREAD_NORMSAVE(5)(r10) + lwz r16, THREAD_NORMSAVE(6)(r10) + lwz r17, THREAD_NORMSAVE(7)(r10) +#endif +8: lwz r11, THREAD_NORMSAVE(3)(r10) + mtcr r11 + lwz r13, THREAD_NORMSAVE(2)(r10) + lwz r12, THREAD_NORMSAVE(1)(r10) + lwz r11, THREAD_NORMSAVE(0)(r10) + mfspr r10, SPRN_SPRG_RSCRATCH0 + rfi /* Force context change */ + +#ifdef CONFIG_SPE +/* Note that the SPE support is closely modeled after the AltiVec + * support. Changes to one are likely to be applicable to the + * other! */ +_GLOBAL(load_up_spe) +/* + * Disable SPE for the task which had SPE previously, + * and save its SPE registers in its thread_struct. + * Enables SPE for use in the kernel on return. + * On SMP we know the SPE units are free, since we give it up every + * switch. -- Kumar + */ + mfmsr r5 + oris r5,r5,MSR_SPE@h + mtmsr r5 /* enable use of SPE now */ + isync + /* enable use of SPE after return */ + oris r9,r9,MSR_SPE@h + mfspr r5,SPRN_SPRG_THREAD /* current task's THREAD (phys) */ + li r4,1 + li r10,THREAD_ACC + stw r4,THREAD_USED_SPE(r5) + evlddx evr4,r10,r5 + evmra evr4,evr4 + REST_32EVRS(0,r10,r5,THREAD_EVR0) + blr + +/* + * SPE unavailable trap from kernel - print a message, but let + * the task use SPE in the kernel until it returns to user mode. + */ +KernelSPE: + lwz r3,_MSR(r1) + oris r3,r3,MSR_SPE@h + stw r3,_MSR(r1) /* enable use of SPE after return */ +#ifdef CONFIG_PRINTK + lis r3,87f@h + ori r3,r3,87f@l + mr r4,r2 /* current */ + lwz r5,_NIP(r1) + bl _printk +#endif + b interrupt_return +#ifdef CONFIG_PRINTK +87: .string "SPE used in kernel (task=%p, pc=%x) \n" +#endif + .align 4,0 + +#endif /* CONFIG_SPE */ + +/* + * Translate the effec addr in r3 to phys addr. The phys addr will be put + * into r3(higher 32bit) and r4(lower 32bit) + */ +get_phys_addr: + mfmsr r8 + mfspr r9,SPRN_PID + rlwinm r9,r9,16,0x3fff0000 /* turn PID into MAS6[SPID] */ + rlwimi r9,r8,28,0x00000001 /* turn MSR[DS] into MAS6[SAS] */ + mtspr SPRN_MAS6,r9 + + tlbsx 0,r3 /* must succeed */ + + mfspr r8,SPRN_MAS1 + mfspr r12,SPRN_MAS3 + rlwinm r9,r8,25,0x1f /* r9 = log2(page size) */ + li r10,1024 + slw r10,r10,r9 /* r10 = page size */ + addi r10,r10,-1 + and r11,r3,r10 /* r11 = page offset */ + andc r4,r12,r10 /* r4 = page base */ + or r4,r4,r11 /* r4 = devtree phys addr */ +#ifdef CONFIG_PHYS_64BIT + mfspr r3,SPRN_MAS7 +#endif + blr + +/* + * Global functions + */ + +#ifdef CONFIG_PPC_E500 +#ifndef CONFIG_PPC_E500MC +/* Adjust or setup IVORs for e500v1/v2 */ +_GLOBAL(__setup_e500_ivors) + li r3,DebugCrit@l + mtspr SPRN_IVOR15,r3 + li r3,SPEUnavailable@l + mtspr SPRN_IVOR32,r3 + li r3,SPEFloatingPointData@l + mtspr SPRN_IVOR33,r3 + li r3,SPEFloatingPointRound@l + mtspr SPRN_IVOR34,r3 + li r3,PerformanceMonitor@l + mtspr SPRN_IVOR35,r3 + sync + blr +#else +/* Adjust or setup IVORs for e500mc */ +_GLOBAL(__setup_e500mc_ivors) + li r3,DebugDebug@l + mtspr SPRN_IVOR15,r3 + li r3,PerformanceMonitor@l + mtspr SPRN_IVOR35,r3 + li r3,Doorbell@l + mtspr SPRN_IVOR36,r3 + li r3,CriticalDoorbell@l + mtspr SPRN_IVOR37,r3 + sync + blr + +/* setup ehv ivors for */ +_GLOBAL(__setup_ehv_ivors) + li r3,GuestDoorbell@l + mtspr SPRN_IVOR38,r3 + li r3,CriticalGuestDoorbell@l + mtspr SPRN_IVOR39,r3 + li r3,Hypercall@l + mtspr SPRN_IVOR40,r3 + li r3,Ehvpriv@l + mtspr SPRN_IVOR41,r3 + sync + blr +#endif /* CONFIG_PPC_E500MC */ +#endif /* CONFIG_PPC_E500 */ + +#ifdef CONFIG_SPE +/* + * extern void __giveup_spe(struct task_struct *prev) + * + */ +_GLOBAL(__giveup_spe) + addi r3,r3,THREAD /* want THREAD of task */ + lwz r5,PT_REGS(r3) + cmpi 0,r5,0 + SAVE_32EVRS(0, r4, r3, THREAD_EVR0) + evxor evr6, evr6, evr6 /* clear out evr6 */ + evmwumiaa evr6, evr6, evr6 /* evr6 <- ACC = 0 * 0 + ACC */ + li r4,THREAD_ACC + evstddx evr6, r4, r3 /* save off accumulator */ + beq 1f + lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5) + lis r3,MSR_SPE@h + andc r4,r4,r3 /* disable SPE for previous task */ + stw r4,_MSR-STACK_FRAME_OVERHEAD(r5) +1: + blr +#endif /* CONFIG_SPE */ + +/* + * extern void abort(void) + * + * At present, this routine just applies a system reset. + */ +_GLOBAL(abort) + li r13,0 + mtspr SPRN_DBCR0,r13 /* disable all debug events */ + isync + mfmsr r13 + ori r13,r13,MSR_DE@l /* Enable Debug Events */ + mtmsr r13 + isync + mfspr r13,SPRN_DBCR0 + lis r13,(DBCR0_IDM|DBCR0_RST_CHIP)@h + mtspr SPRN_DBCR0,r13 + isync + +#ifdef CONFIG_SMP +/* When we get here, r24 needs to hold the CPU # */ + .globl __secondary_start +__secondary_start: + LOAD_REG_ADDR_PIC(r3, tlbcam_index) + lwz r3,0(r3) + mtctr r3 + li r26,0 /* r26 safe? */ + + bl switch_to_as1 + mr r27,r3 /* tlb entry */ + /* Load each CAM entry */ +1: mr r3,r26 + bl loadcam_entry + addi r26,r26,1 + bdnz 1b + mr r3,r27 /* tlb entry */ + LOAD_REG_ADDR_PIC(r4, memstart_addr) + lwz r4,0(r4) + mr r5,r25 /* phys kernel start */ + rlwinm r5,r5,0,~0x3ffffff /* aligned 64M */ + subf r4,r5,r4 /* memstart_addr - phys kernel start */ + lis r7,KERNELBASE@h + ori r7,r7,KERNELBASE@l + cmpw r20,r7 /* if kernstart_virt_addr != KERNELBASE, randomized */ + beq 2f + li r4,0 +2: li r5,0 /* no device tree */ + li r6,0 /* not boot cpu */ + bl restore_to_as0 + + + lis r3,__secondary_hold_acknowledge@h + ori r3,r3,__secondary_hold_acknowledge@l + stw r24,0(r3) + + li r3,0 + mr r4,r24 /* Why? */ + bl call_setup_cpu + + /* get current's stack and current */ + lis r2,secondary_current@ha + lwz r2,secondary_current@l(r2) + lwz r1,TASK_STACK(r2) + + /* stack */ + addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD + li r0,0 + stw r0,0(r1) + + /* ptr to current thread */ + addi r4,r2,THREAD /* address of our thread_struct */ + mtspr SPRN_SPRG_THREAD,r4 + + /* Setup the defaults for TLB entries */ + li r4,(MAS4_TSIZED(BOOK3E_PAGESZ_4K))@l + mtspr SPRN_MAS4,r4 + + /* Jump to start_secondary */ + lis r4,MSR_KERNEL@h + ori r4,r4,MSR_KERNEL@l + lis r3,start_secondary@h + ori r3,r3,start_secondary@l + mtspr SPRN_SRR0,r3 + mtspr SPRN_SRR1,r4 + sync + rfi + sync + + .globl __secondary_hold_acknowledge +__secondary_hold_acknowledge: + .long -1 +#endif + +/* + * Create a 64M tlb by address and entry + * r3 - entry + * r4 - virtual address + * r5/r6 - physical address + */ +_GLOBAL(create_kaslr_tlb_entry) + lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */ + rlwimi r7,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r6) */ + mtspr SPRN_MAS0,r7 /* Write MAS0 */ + + lis r3,(MAS1_VALID|MAS1_IPROT)@h + ori r3,r3,(MAS1_TSIZE(BOOK3E_PAGESZ_64M))@l + mtspr SPRN_MAS1,r3 /* Write MAS1 */ + + lis r3,MAS2_EPN_MASK(BOOK3E_PAGESZ_64M)@h + ori r3,r3,MAS2_EPN_MASK(BOOK3E_PAGESZ_64M)@l + and r3,r3,r4 + ori r3,r3,MAS2_M_IF_NEEDED@l + mtspr SPRN_MAS2,r3 /* Write MAS2(EPN) */ + +#ifdef CONFIG_PHYS_64BIT + ori r8,r6,(MAS3_SW|MAS3_SR|MAS3_SX) + mtspr SPRN_MAS3,r8 /* Write MAS3(RPN) */ + mtspr SPRN_MAS7,r5 +#else + ori r8,r5,(MAS3_SW|MAS3_SR|MAS3_SX) + mtspr SPRN_MAS3,r8 /* Write MAS3(RPN) */ +#endif + + tlbwe /* Write TLB */ + isync + sync + blr + +/* + * Return to the start of the relocated kernel and run again + * r3 - virtual address of fdt + * r4 - entry of the kernel + */ +_GLOBAL(reloc_kernel_entry) + mfmsr r7 + rlwinm r7, r7, 0, ~(MSR_IS | MSR_DS) + + mtspr SPRN_SRR0,r4 + mtspr SPRN_SRR1,r7 + rfi + +/* + * Create a tlb entry with the same effective and physical address as + * the tlb entry used by the current running code. But set the TS to 1. + * Then switch to the address space 1. It will return with the r3 set to + * the ESEL of the new created tlb. + */ +_GLOBAL(switch_to_as1) + mflr r5 + + /* Find a entry not used */ + mfspr r3,SPRN_TLB1CFG + andi. r3,r3,0xfff + mfspr r4,SPRN_PID + rlwinm r4,r4,16,0x3fff0000 /* turn PID into MAS6[SPID] */ + mtspr SPRN_MAS6,r4 +1: lis r4,0x1000 /* Set MAS0(TLBSEL) = 1 */ + addi r3,r3,-1 + rlwimi r4,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */ + mtspr SPRN_MAS0,r4 + tlbre + mfspr r4,SPRN_MAS1 + andis. r4,r4,MAS1_VALID@h + bne 1b + + /* Get the tlb entry used by the current running code */ + bcl 20,31,$+4 +0: mflr r4 + tlbsx 0,r4 + + mfspr r4,SPRN_MAS1 + ori r4,r4,MAS1_TS /* Set the TS = 1 */ + mtspr SPRN_MAS1,r4 + + mfspr r4,SPRN_MAS0 + rlwinm r4,r4,0,~MAS0_ESEL_MASK + rlwimi r4,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */ + mtspr SPRN_MAS0,r4 + tlbwe + isync + sync + + mfmsr r4 + ori r4,r4,MSR_IS | MSR_DS + mtspr SPRN_SRR0,r5 + mtspr SPRN_SRR1,r4 + sync + rfi + +/* + * Restore to the address space 0 and also invalidate the tlb entry created + * by switch_to_as1. + * r3 - the tlb entry which should be invalidated + * r4 - __pa(PAGE_OFFSET in AS1) - __pa(PAGE_OFFSET in AS0) + * r5 - device tree virtual address. If r4 is 0, r5 is ignored. + * r6 - boot cpu +*/ +_GLOBAL(restore_to_as0) + mflr r0 + + bcl 20,31,$+4 +0: mflr r9 + addi r9,r9,1f - 0b + + /* + * We may map the PAGE_OFFSET in AS0 to a different physical address, + * so we need calculate the right jump and device tree address based + * on the offset passed by r4. + */ + add r9,r9,r4 + add r5,r5,r4 + add r0,r0,r4 + +2: mfmsr r7 + li r8,(MSR_IS | MSR_DS) + andc r7,r7,r8 + + mtspr SPRN_SRR0,r9 + mtspr SPRN_SRR1,r7 + sync + rfi + + /* Invalidate the temporary tlb entry for AS1 */ +1: lis r9,0x1000 /* Set MAS0(TLBSEL) = 1 */ + rlwimi r9,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */ + mtspr SPRN_MAS0,r9 + tlbre + mfspr r9,SPRN_MAS1 + rlwinm r9,r9,0,2,31 /* Clear MAS1 Valid and IPPROT */ + mtspr SPRN_MAS1,r9 + tlbwe + isync + + cmpwi r4,0 + cmpwi cr1,r6,0 + cror eq,4*cr1+eq,eq + bne 3f /* offset != 0 && is_boot_cpu */ + mtlr r0 + blr + + /* + * The PAGE_OFFSET will map to a different physical address, + * jump to _start to do another relocation again. + */ +3: mr r3,r5 + bl _start diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S new file mode 100644 index 000000000..0b05f2be6 --- /dev/null +++ b/arch/powerpc/kernel/head_8xx.S @@ -0,0 +1,789 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * PowerPC version + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP + * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> + * Low-level exception handlers and MMU support + * rewritten by Paul Mackerras. + * Copyright (C) 1996 Paul Mackerras. + * MPC8xx modifications by Dan Malek + * Copyright (C) 1997 Dan Malek (dmalek@jlc.net). + * + * This file contains low-level support and setup for PowerPC 8xx + * embedded processors, including trap and interrupt dispatch. + */ + +#include <linux/init.h> +#include <linux/magic.h> +#include <linux/pgtable.h> +#include <linux/sizes.h> +#include <asm/processor.h> +#include <asm/page.h> +#include <asm/mmu.h> +#include <asm/cache.h> +#include <asm/cputable.h> +#include <asm/thread_info.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/ptrace.h> +#include <asm/export.h> +#include <asm/code-patching-asm.h> +#include <asm/interrupt.h> + +/* + * Value for the bits that have fixed value in RPN entries. + * Also used for tagging DAR for DTLBerror. + */ +#define RPN_PATTERN 0x00f0 + +#include "head_32.h" + +.macro compare_to_kernel_boundary scratch, addr +#if CONFIG_TASK_SIZE <= 0x80000000 && CONFIG_PAGE_OFFSET >= 0x80000000 +/* By simply checking Address >= 0x80000000, we know if its a kernel address */ + not. \scratch, \addr +#else + rlwinm \scratch, \addr, 16, 0xfff8 + cmpli cr0, \scratch, PAGE_OFFSET@h +#endif +.endm + +#define PAGE_SHIFT_512K 19 +#define PAGE_SHIFT_8M 23 + + __HEAD +_GLOBAL(_stext); +_GLOBAL(_start); + +/* MPC8xx + * This port was done on an MBX board with an 860. Right now I only + * support an ELF compressed (zImage) boot from EPPC-Bug because the + * code there loads up some registers before calling us: + * r3: ptr to board info data + * r4: initrd_start or if no initrd then 0 + * r5: initrd_end - unused if r4 is 0 + * r6: Start of command line string + * r7: End of command line string + * + * I decided to use conditional compilation instead of checking PVR and + * adding more processor specific branches around code I don't need. + * Since this is an embedded processor, I also appreciate any memory + * savings I can get. + * + * The MPC8xx does not have any BATs, but it supports large page sizes. + * We first initialize the MMU to support 8M byte pages, then load one + * entry into each of the instruction and data TLBs to map the first + * 8M 1:1. I also mapped an additional I/O space 1:1 so we can get to + * the "internal" processor registers before MMU_init is called. + * + * -- Dan + */ + .globl __start +__start: + mr r31,r3 /* save device tree ptr */ + + /* We have to turn on the MMU right away so we get cache modes + * set correctly. + */ + bl initial_mmu + +/* We now have the lower 8 Meg mapped into TLB entries, and the caches + * ready to work. + */ + +turn_on_mmu: + mfmsr r0 + ori r0,r0,MSR_DR|MSR_IR + mtspr SPRN_SRR1,r0 + lis r0,start_here@h + ori r0,r0,start_here@l + mtspr SPRN_SRR0,r0 + rfi /* enables MMU */ + + +#ifdef CONFIG_PERF_EVENTS + .align 4 + + .globl itlb_miss_counter +itlb_miss_counter: + .space 4 + + .globl dtlb_miss_counter +dtlb_miss_counter: + .space 4 + + .globl instruction_counter +instruction_counter: + .space 4 +#endif + +/* System reset */ + EXCEPTION(INTERRUPT_SYSTEM_RESET, Reset, system_reset_exception) + +/* Machine check */ + START_EXCEPTION(INTERRUPT_MACHINE_CHECK, MachineCheck) + EXCEPTION_PROLOG INTERRUPT_MACHINE_CHECK MachineCheck handle_dar_dsisr=1 + prepare_transfer_to_handler + bl machine_check_exception + b interrupt_return + +/* External interrupt */ + EXCEPTION(INTERRUPT_EXTERNAL, HardwareInterrupt, do_IRQ) + +/* Alignment exception */ + START_EXCEPTION(INTERRUPT_ALIGNMENT, Alignment) + EXCEPTION_PROLOG INTERRUPT_ALIGNMENT Alignment handle_dar_dsisr=1 + prepare_transfer_to_handler + bl alignment_exception + REST_NVGPRS(r1) + b interrupt_return + +/* Program check exception */ + START_EXCEPTION(INTERRUPT_PROGRAM, ProgramCheck) + EXCEPTION_PROLOG INTERRUPT_PROGRAM ProgramCheck + prepare_transfer_to_handler + bl program_check_exception + REST_NVGPRS(r1) + b interrupt_return + +/* Decrementer */ + EXCEPTION(INTERRUPT_DECREMENTER, Decrementer, timer_interrupt) + +/* System call */ + START_EXCEPTION(INTERRUPT_SYSCALL, SystemCall) + SYSCALL_ENTRY INTERRUPT_SYSCALL + +/* Single step - not used on 601 */ + EXCEPTION(INTERRUPT_TRACE, SingleStep, single_step_exception) + +/* On the MPC8xx, this is a software emulation interrupt. It occurs + * for all unimplemented and illegal instructions. + */ + START_EXCEPTION(INTERRUPT_SOFT_EMU_8xx, SoftEmu) + EXCEPTION_PROLOG INTERRUPT_SOFT_EMU_8xx SoftEmu + prepare_transfer_to_handler + bl emulation_assist_interrupt + REST_NVGPRS(r1) + b interrupt_return + +/* + * For the MPC8xx, this is a software tablewalk to load the instruction + * TLB. The task switch loads the M_TWB register with the pointer to the first + * level table. + * If we discover there is no second level table (value is zero) or if there + * is an invalid pte, we load that into the TLB, which causes another fault + * into the TLB Error interrupt where we can handle such problems. + * We have to use the MD_xxx registers for the tablewalk because the + * equivalent MI_xxx registers only perform the attribute functions. + */ + +#ifdef CONFIG_8xx_CPU15 +#define INVALIDATE_ADJACENT_PAGES_CPU15(addr, tmp) \ + addi tmp, addr, PAGE_SIZE; \ + tlbie tmp; \ + addi tmp, addr, -PAGE_SIZE; \ + tlbie tmp +#else +#define INVALIDATE_ADJACENT_PAGES_CPU15(addr, tmp) +#endif + + START_EXCEPTION(INTERRUPT_INST_TLB_MISS_8xx, InstructionTLBMiss) + mtspr SPRN_SPRG_SCRATCH2, r10 + mtspr SPRN_M_TW, r11 + + /* If we are faulting a kernel address, we have to use the + * kernel page tables. + */ + mfspr r10, SPRN_SRR0 /* Get effective address of fault */ + INVALIDATE_ADJACENT_PAGES_CPU15(r10, r11) + mtspr SPRN_MD_EPN, r10 +#ifdef CONFIG_MODULES + mfcr r11 + compare_to_kernel_boundary r10, r10 +#endif + mfspr r10, SPRN_M_TWB /* Get level 1 table */ +#ifdef CONFIG_MODULES + blt+ 3f + rlwinm r10, r10, 0, 20, 31 + oris r10, r10, (swapper_pg_dir - PAGE_OFFSET)@ha +3: + mtcr r11 +#endif + lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r10) /* Get level 1 entry */ + mtspr SPRN_MD_TWC, r11 + mfspr r10, SPRN_MD_TWC + lwz r10, 0(r10) /* Get the pte */ + rlwimi r11, r10, 0, _PAGE_GUARDED | _PAGE_ACCESSED + rlwimi r11, r10, 32 - 9, _PMD_PAGE_512K + mtspr SPRN_MI_TWC, r11 + /* The Linux PTE won't go exactly into the MMU TLB. + * Software indicator bits 20 and 23 must be clear. + * Software indicator bits 22, 24, 25, 26, and 27 must be + * set. All other Linux PTE bits control the behavior + * of the MMU. + */ + rlwinm r10, r10, 0, ~0x0f00 /* Clear bits 20-23 */ + rlwimi r10, r10, 4, 0x0400 /* Copy _PAGE_EXEC into bit 21 */ + ori r10, r10, RPN_PATTERN | 0x200 /* Set 22 and 24-27 */ + mtspr SPRN_MI_RPN, r10 /* Update TLB entry */ + + /* Restore registers */ +0: mfspr r10, SPRN_SPRG_SCRATCH2 + mfspr r11, SPRN_M_TW + rfi + patch_site 0b, patch__itlbmiss_exit_1 + +#ifdef CONFIG_PERF_EVENTS + patch_site 0f, patch__itlbmiss_perf +0: lwz r10, (itlb_miss_counter - PAGE_OFFSET)@l(0) + addi r10, r10, 1 + stw r10, (itlb_miss_counter - PAGE_OFFSET)@l(0) + mfspr r10, SPRN_SPRG_SCRATCH2 + mfspr r11, SPRN_M_TW + rfi +#endif + + START_EXCEPTION(INTERRUPT_DATA_TLB_MISS_8xx, DataStoreTLBMiss) + mtspr SPRN_SPRG_SCRATCH2, r10 + mtspr SPRN_M_TW, r11 + mfcr r11 + + /* If we are faulting a kernel address, we have to use the + * kernel page tables. + */ + mfspr r10, SPRN_MD_EPN + compare_to_kernel_boundary r10, r10 + mfspr r10, SPRN_M_TWB /* Get level 1 table */ + blt+ 3f + rlwinm r10, r10, 0, 20, 31 + oris r10, r10, (swapper_pg_dir - PAGE_OFFSET)@ha +3: + mtcr r11 + lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r10) /* Get level 1 entry */ + + mtspr SPRN_MD_TWC, r11 + mfspr r10, SPRN_MD_TWC + lwz r10, 0(r10) /* Get the pte */ + + /* Insert Guarded and Accessed flags into the TWC from the Linux PTE. + * It is bit 27 of both the Linux PTE and the TWC (at least + * I got that right :-). It will be better when we can put + * this into the Linux pgd/pmd and load it in the operation + * above. + */ + rlwimi r11, r10, 0, _PAGE_GUARDED | _PAGE_ACCESSED + rlwimi r11, r10, 32 - 9, _PMD_PAGE_512K + mtspr SPRN_MD_TWC, r11 + + /* The Linux PTE won't go exactly into the MMU TLB. + * Software indicator bits 24, 25, 26, and 27 must be + * set. All other Linux PTE bits control the behavior + * of the MMU. + */ + li r11, RPN_PATTERN + rlwimi r10, r11, 0, 24, 27 /* Set 24-27 */ + mtspr SPRN_MD_RPN, r10 /* Update TLB entry */ + mtspr SPRN_DAR, r11 /* Tag DAR */ + + /* Restore registers */ + +0: mfspr r10, SPRN_SPRG_SCRATCH2 + mfspr r11, SPRN_M_TW + rfi + patch_site 0b, patch__dtlbmiss_exit_1 + +#ifdef CONFIG_PERF_EVENTS + patch_site 0f, patch__dtlbmiss_perf +0: lwz r10, (dtlb_miss_counter - PAGE_OFFSET)@l(0) + addi r10, r10, 1 + stw r10, (dtlb_miss_counter - PAGE_OFFSET)@l(0) + mfspr r10, SPRN_SPRG_SCRATCH2 + mfspr r11, SPRN_M_TW + rfi +#endif + +/* This is an instruction TLB error on the MPC8xx. This could be due + * to many reasons, such as executing guarded memory or illegal instruction + * addresses. There is nothing to do but handle a big time error fault. + */ + START_EXCEPTION(INTERRUPT_INST_TLB_ERROR_8xx, InstructionTLBError) + /* 0x400 is InstructionAccess exception, needed by bad_page_fault() */ + EXCEPTION_PROLOG INTERRUPT_INST_STORAGE InstructionTLBError + andis. r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */ + andis. r10,r9,SRR1_ISI_NOPT@h + beq+ .Litlbie + tlbie r12 +.Litlbie: + stw r12, _DAR(r11) + stw r5, _DSISR(r11) + prepare_transfer_to_handler + bl do_page_fault + b interrupt_return + +/* This is the data TLB error on the MPC8xx. This could be due to + * many reasons, including a dirty update to a pte. We bail out to + * a higher level function that can handle it. + */ + START_EXCEPTION(INTERRUPT_DATA_TLB_ERROR_8xx, DataTLBError) + EXCEPTION_PROLOG_0 handle_dar_dsisr=1 + mfspr r11, SPRN_DAR + cmpwi cr1, r11, RPN_PATTERN + beq- cr1, FixupDAR /* must be a buggy dcbX, icbi insn. */ +DARFixed:/* Return from dcbx instruction bug workaround */ + EXCEPTION_PROLOG_1 + /* 0x300 is DataAccess exception, needed by bad_page_fault() */ + EXCEPTION_PROLOG_2 INTERRUPT_DATA_STORAGE DataTLBError handle_dar_dsisr=1 + lwz r4, _DAR(r11) + lwz r5, _DSISR(r11) + andis. r10,r5,DSISR_NOHPTE@h + beq+ .Ldtlbie + tlbie r4 +.Ldtlbie: + prepare_transfer_to_handler + bl do_page_fault + b interrupt_return + +#ifdef CONFIG_VMAP_STACK + vmap_stack_overflow_exception +#endif + +/* On the MPC8xx, these next four traps are used for development + * support of breakpoints and such. Someday I will get around to + * using them. + */ + START_EXCEPTION(INTERRUPT_DATA_BREAKPOINT_8xx, DataBreakpoint) + EXCEPTION_PROLOG_0 handle_dar_dsisr=1 + mfspr r11, SPRN_SRR0 + cmplwi cr1, r11, (.Ldtlbie - PAGE_OFFSET)@l + cmplwi cr7, r11, (.Litlbie - PAGE_OFFSET)@l + cror 4*cr1+eq, 4*cr1+eq, 4*cr7+eq + bne cr1, 1f + mtcr r10 + mfspr r10, SPRN_SPRG_SCRATCH0 + mfspr r11, SPRN_SPRG_SCRATCH1 + rfi + +1: EXCEPTION_PROLOG_1 + EXCEPTION_PROLOG_2 INTERRUPT_DATA_BREAKPOINT_8xx DataBreakpoint handle_dar_dsisr=1 + mfspr r4,SPRN_BAR + stw r4,_DAR(r11) + prepare_transfer_to_handler + bl do_break + REST_NVGPRS(r1) + b interrupt_return + +#ifdef CONFIG_PERF_EVENTS + START_EXCEPTION(INTERRUPT_INST_BREAKPOINT_8xx, InstructionBreakpoint) + mtspr SPRN_SPRG_SCRATCH0, r10 + lwz r10, (instruction_counter - PAGE_OFFSET)@l(0) + addi r10, r10, -1 + stw r10, (instruction_counter - PAGE_OFFSET)@l(0) + lis r10, 0xffff + ori r10, r10, 0x01 + mtspr SPRN_COUNTA, r10 + mfspr r10, SPRN_SPRG_SCRATCH0 + rfi +#else + EXCEPTION(INTERRUPT_INST_BREAKPOINT_8xx, Trap_1d, unknown_exception) +#endif + EXCEPTION(0x1e00, Trap_1e, unknown_exception) + EXCEPTION(0x1f00, Trap_1f, unknown_exception) + + __HEAD + . = 0x2000 + +/* This is the procedure to calculate the data EA for buggy dcbx,dcbi instructions + * by decoding the registers used by the dcbx instruction and adding them. + * DAR is set to the calculated address. + */ +FixupDAR:/* Entry point for dcbx workaround. */ + mtspr SPRN_M_TW, r10 + /* fetch instruction from memory. */ + mfspr r10, SPRN_SRR0 + mtspr SPRN_MD_EPN, r10 + rlwinm r11, r10, 16, 0xfff8 + cmpli cr1, r11, PAGE_OFFSET@h + mfspr r11, SPRN_M_TWB /* Get level 1 table */ + blt+ cr1, 3f + + /* create physical page address from effective address */ + tophys(r11, r10) + mfspr r11, SPRN_M_TWB /* Get level 1 table */ + rlwinm r11, r11, 0, 20, 31 + oris r11, r11, (swapper_pg_dir - PAGE_OFFSET)@ha +3: + lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */ + mtspr SPRN_MD_TWC, r11 + mtcrf 0x01, r11 + mfspr r11, SPRN_MD_TWC + lwz r11, 0(r11) /* Get the pte */ + bt 28,200f /* bit 28 = Large page (8M) */ + /* concat physical page address(r11) and page offset(r10) */ + rlwimi r11, r10, 0, 32 - PAGE_SHIFT, 31 +201: lwz r11,0(r11) +/* Check if it really is a dcbx instruction. */ +/* dcbt and dcbtst does not generate DTLB Misses/Errors, + * no need to include them here */ + xoris r10, r11, 0x7c00 /* check if major OP code is 31 */ + rlwinm r10, r10, 0, 21, 5 + cmpwi cr1, r10, 2028 /* Is dcbz? */ + beq+ cr1, 142f + cmpwi cr1, r10, 940 /* Is dcbi? */ + beq+ cr1, 142f + cmpwi cr1, r10, 108 /* Is dcbst? */ + beq+ cr1, 144f /* Fix up store bit! */ + cmpwi cr1, r10, 172 /* Is dcbf? */ + beq+ cr1, 142f + cmpwi cr1, r10, 1964 /* Is icbi? */ + beq+ cr1, 142f +141: mfspr r10,SPRN_M_TW + b DARFixed /* Nope, go back to normal TLB processing */ + +200: + /* concat physical page address(r11) and page offset(r10) */ + rlwimi r11, r10, 0, 32 - PAGE_SHIFT_8M, 31 + b 201b + +144: mfspr r10, SPRN_DSISR + rlwinm r10, r10,0,7,5 /* Clear store bit for buggy dcbst insn */ + mtspr SPRN_DSISR, r10 +142: /* continue, it was a dcbx, dcbi instruction. */ + mfctr r10 + mtdar r10 /* save ctr reg in DAR */ + rlwinm r10, r11, 24, 24, 28 /* offset into jump table for reg RB */ + addi r10, r10, 150f@l /* add start of table */ + mtctr r10 /* load ctr with jump address */ + xor r10, r10, r10 /* sum starts at zero */ + bctr /* jump into table */ +150: + add r10, r10, r0 ;b 151f + add r10, r10, r1 ;b 151f + add r10, r10, r2 ;b 151f + add r10, r10, r3 ;b 151f + add r10, r10, r4 ;b 151f + add r10, r10, r5 ;b 151f + add r10, r10, r6 ;b 151f + add r10, r10, r7 ;b 151f + add r10, r10, r8 ;b 151f + add r10, r10, r9 ;b 151f + mtctr r11 ;b 154f /* r10 needs special handling */ + mtctr r11 ;b 153f /* r11 needs special handling */ + add r10, r10, r12 ;b 151f + add r10, r10, r13 ;b 151f + add r10, r10, r14 ;b 151f + add r10, r10, r15 ;b 151f + add r10, r10, r16 ;b 151f + add r10, r10, r17 ;b 151f + add r10, r10, r18 ;b 151f + add r10, r10, r19 ;b 151f + add r10, r10, r20 ;b 151f + add r10, r10, r21 ;b 151f + add r10, r10, r22 ;b 151f + add r10, r10, r23 ;b 151f + add r10, r10, r24 ;b 151f + add r10, r10, r25 ;b 151f + add r10, r10, r26 ;b 151f + add r10, r10, r27 ;b 151f + add r10, r10, r28 ;b 151f + add r10, r10, r29 ;b 151f + add r10, r10, r30 ;b 151f + add r10, r10, r31 +151: + rlwinm r11,r11,19,24,28 /* offset into jump table for reg RA */ + cmpwi cr1, r11, 0 + beq cr1, 152f /* if reg RA is zero, don't add it */ + addi r11, r11, 150b@l /* add start of table */ + mtctr r11 /* load ctr with jump address */ + rlwinm r11,r11,0,16,10 /* make sure we don't execute this more than once */ + bctr /* jump into table */ +152: + mfdar r11 + mtctr r11 /* restore ctr reg from DAR */ + mfspr r11, SPRN_SPRG_THREAD + stw r10, DAR(r11) + mfspr r10, SPRN_DSISR + stw r10, DSISR(r11) + mfspr r10,SPRN_M_TW + b DARFixed /* Go back to normal TLB handling */ + + /* special handling for r10,r11 since these are modified already */ +153: mfspr r11, SPRN_SPRG_SCRATCH1 /* load r11 from SPRN_SPRG_SCRATCH1 */ + add r10, r10, r11 /* add it */ + mfctr r11 /* restore r11 */ + b 151b +154: mfspr r11, SPRN_SPRG_SCRATCH0 /* load r10 from SPRN_SPRG_SCRATCH0 */ + add r10, r10, r11 /* add it */ + mfctr r11 /* restore r11 */ + b 151b + +/* + * This is where the main kernel code starts. + */ +start_here: + /* ptr to current */ + lis r2,init_task@h + ori r2,r2,init_task@l + + /* ptr to phys current thread */ + tophys(r4,r2) + addi r4,r4,THREAD /* init task's THREAD */ + mtspr SPRN_SPRG_THREAD,r4 + + /* stack */ + lis r1,init_thread_union@ha + addi r1,r1,init_thread_union@l + lis r0, STACK_END_MAGIC@h + ori r0, r0, STACK_END_MAGIC@l + stw r0, 0(r1) + li r0,0 + stwu r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1) + + lis r6, swapper_pg_dir@ha + tophys(r6,r6) + mtspr SPRN_M_TWB, r6 + + bl early_init /* We have to do this with MMU on */ + +/* + * Decide what sort of machine this is and initialize the MMU. + */ +#ifdef CONFIG_KASAN + bl kasan_early_init +#endif + li r3,0 + mr r4,r31 + bl machine_init + bl MMU_init + +/* + * Go back to running unmapped so we can load up new values + * and change to using our exception vectors. + * On the 8xx, all we have to do is invalidate the TLB to clear + * the old 8M byte TLB mappings and load the page table base register. + */ + /* The right way to do this would be to track it down through + * init's THREAD like the context switch code does, but this is + * easier......until someone changes init's static structures. + */ + lis r4,2f@h + ori r4,r4,2f@l + tophys(r4,r4) + li r3,MSR_KERNEL & ~(MSR_IR|MSR_DR) + mtspr SPRN_SRR0,r4 + mtspr SPRN_SRR1,r3 + rfi +/* Load up the kernel context */ +2: +#ifdef CONFIG_PIN_TLB_IMMR + lis r0, MD_TWAM@h + oris r0, r0, 0x1f00 + mtspr SPRN_MD_CTR, r0 + LOAD_REG_IMMEDIATE(r0, VIRT_IMMR_BASE | MD_EVALID) + tlbie r0 + mtspr SPRN_MD_EPN, r0 + LOAD_REG_IMMEDIATE(r0, MD_SVALID | MD_PS512K | MD_GUARDED) + mtspr SPRN_MD_TWC, r0 + mfspr r0, SPRN_IMMR + rlwinm r0, r0, 0, 0xfff80000 + ori r0, r0, 0xf0 | _PAGE_DIRTY | _PAGE_SPS | _PAGE_SH | \ + _PAGE_NO_CACHE | _PAGE_PRESENT + mtspr SPRN_MD_RPN, r0 + lis r0, (MD_TWAM | MD_RSV4I)@h + mtspr SPRN_MD_CTR, r0 +#endif +#if !defined(CONFIG_PIN_TLB_DATA) && !defined(CONFIG_PIN_TLB_IMMR) + lis r0, MD_TWAM@h + mtspr SPRN_MD_CTR, r0 +#endif + tlbia /* Clear all TLB entries */ + sync /* wait for tlbia/tlbie to finish */ + + /* set up the PTE pointers for the Abatron bdiGDB. + */ + lis r5, abatron_pteptrs@h + ori r5, r5, abatron_pteptrs@l + stw r5, 0xf0(0) /* Must match your Abatron config file */ + tophys(r5,r5) + lis r6, swapper_pg_dir@h + ori r6, r6, swapper_pg_dir@l + stw r6, 0(r5) + +/* Now turn on the MMU for real! */ + li r4,MSR_KERNEL + lis r3,start_kernel@h + ori r3,r3,start_kernel@l + mtspr SPRN_SRR0,r3 + mtspr SPRN_SRR1,r4 + rfi /* enable MMU and jump to start_kernel */ + +/* Set up the initial MMU state so we can do the first level of + * kernel initialization. This maps the first 8 MBytes of memory 1:1 + * virtual to physical. Also, set the cache mode since that is defined + * by TLB entries and perform any additional mapping (like of the IMMR). + * If configured to pin some TLBs, we pin the first 8 Mbytes of kernel, + * 24 Mbytes of data, and the 512k IMMR space. Anything not covered by + * these mappings is mapped by page tables. + */ +initial_mmu: + li r8, 0 + mtspr SPRN_MI_CTR, r8 /* remove PINNED ITLB entries */ + lis r10, MD_TWAM@h + mtspr SPRN_MD_CTR, r10 /* remove PINNED DTLB entries */ + + tlbia /* Invalidate all TLB entries */ + + lis r8, MI_APG_INIT@h /* Set protection modes */ + ori r8, r8, MI_APG_INIT@l + mtspr SPRN_MI_AP, r8 + lis r8, MD_APG_INIT@h + ori r8, r8, MD_APG_INIT@l + mtspr SPRN_MD_AP, r8 + + /* Map the lower RAM (up to 32 Mbytes) into the ITLB and DTLB */ + lis r8, MI_RSV4I@h + ori r8, r8, 0x1c00 + oris r12, r10, MD_RSV4I@h + ori r12, r12, 0x1c00 + li r9, 4 /* up to 4 pages of 8M */ + mtctr r9 + lis r9, KERNELBASE@h /* Create vaddr for TLB */ + li r10, MI_PS8MEG | _PMD_ACCESSED | MI_SVALID + li r11, MI_BOOTINIT /* Create RPN for address 0 */ +1: + mtspr SPRN_MI_CTR, r8 /* Set instruction MMU control */ + addi r8, r8, 0x100 + ori r0, r9, MI_EVALID /* Mark it valid */ + mtspr SPRN_MI_EPN, r0 + mtspr SPRN_MI_TWC, r10 + mtspr SPRN_MI_RPN, r11 /* Store TLB entry */ + mtspr SPRN_MD_CTR, r12 + addi r12, r12, 0x100 + mtspr SPRN_MD_EPN, r0 + mtspr SPRN_MD_TWC, r10 + mtspr SPRN_MD_RPN, r11 + addis r9, r9, 0x80 + addis r11, r11, 0x80 + + bdnz 1b + + /* Since the cache is enabled according to the information we + * just loaded into the TLB, invalidate and enable the caches here. + * We should probably check/set other modes....later. + */ + lis r8, IDC_INVALL@h + mtspr SPRN_IC_CST, r8 + mtspr SPRN_DC_CST, r8 + lis r8, IDC_ENABLE@h + mtspr SPRN_IC_CST, r8 + mtspr SPRN_DC_CST, r8 + /* Disable debug mode entry on breakpoints */ + mfspr r8, SPRN_DER +#ifdef CONFIG_PERF_EVENTS + rlwinm r8, r8, 0, ~0xc +#else + rlwinm r8, r8, 0, ~0x8 +#endif + mtspr SPRN_DER, r8 + blr + +_GLOBAL(mmu_pin_tlb) + lis r9, (1f - PAGE_OFFSET)@h + ori r9, r9, (1f - PAGE_OFFSET)@l + mfmsr r10 + mflr r11 + li r12, MSR_KERNEL & ~(MSR_IR | MSR_DR | MSR_RI) + rlwinm r0, r10, 0, ~MSR_RI + rlwinm r0, r0, 0, ~MSR_EE + mtmsr r0 + isync + .align 4 + mtspr SPRN_SRR0, r9 + mtspr SPRN_SRR1, r12 + rfi +1: + li r5, 0 + lis r6, MD_TWAM@h + mtspr SPRN_MI_CTR, r5 + mtspr SPRN_MD_CTR, r6 + tlbia + + LOAD_REG_IMMEDIATE(r5, 28 << 8) + LOAD_REG_IMMEDIATE(r6, PAGE_OFFSET) + LOAD_REG_IMMEDIATE(r7, MI_SVALID | MI_PS8MEG | _PMD_ACCESSED) + LOAD_REG_IMMEDIATE(r8, 0xf0 | _PAGE_RO | _PAGE_SPS | _PAGE_SH | _PAGE_PRESENT) + LOAD_REG_ADDR(r9, _sinittext) + li r0, 4 + mtctr r0 + +2: ori r0, r6, MI_EVALID + mtspr SPRN_MI_CTR, r5 + mtspr SPRN_MI_EPN, r0 + mtspr SPRN_MI_TWC, r7 + mtspr SPRN_MI_RPN, r8 + addi r5, r5, 0x100 + addis r6, r6, SZ_8M@h + addis r8, r8, SZ_8M@h + cmplw r6, r9 + bdnzt lt, 2b + lis r0, MI_RSV4I@h + mtspr SPRN_MI_CTR, r0 + + LOAD_REG_IMMEDIATE(r5, 28 << 8 | MD_TWAM) +#ifdef CONFIG_PIN_TLB_DATA + LOAD_REG_IMMEDIATE(r6, PAGE_OFFSET) + LOAD_REG_IMMEDIATE(r7, MI_SVALID | MI_PS8MEG | _PMD_ACCESSED) + li r8, 0 +#ifdef CONFIG_PIN_TLB_IMMR + li r0, 3 +#else + li r0, 4 +#endif + mtctr r0 + cmpwi r4, 0 + beq 4f + LOAD_REG_ADDR(r9, _sinittext) + +2: ori r0, r6, MD_EVALID + ori r12, r8, 0xf0 | _PAGE_RO | _PAGE_SPS | _PAGE_SH | _PAGE_PRESENT + mtspr SPRN_MD_CTR, r5 + mtspr SPRN_MD_EPN, r0 + mtspr SPRN_MD_TWC, r7 + mtspr SPRN_MD_RPN, r12 + addi r5, r5, 0x100 + addis r6, r6, SZ_8M@h + addis r8, r8, SZ_8M@h + cmplw r6, r9 + bdnzt lt, 2b +4: +2: ori r0, r6, MD_EVALID + ori r12, r8, 0xf0 | _PAGE_DIRTY | _PAGE_SPS | _PAGE_SH | _PAGE_PRESENT + mtspr SPRN_MD_CTR, r5 + mtspr SPRN_MD_EPN, r0 + mtspr SPRN_MD_TWC, r7 + mtspr SPRN_MD_RPN, r12 + addi r5, r5, 0x100 + addis r6, r6, SZ_8M@h + addis r8, r8, SZ_8M@h + cmplw r6, r3 + bdnzt lt, 2b +#endif +#ifdef CONFIG_PIN_TLB_IMMR + LOAD_REG_IMMEDIATE(r0, VIRT_IMMR_BASE | MD_EVALID) + LOAD_REG_IMMEDIATE(r7, MD_SVALID | MD_PS512K | MD_GUARDED | _PMD_ACCESSED) + mfspr r8, SPRN_IMMR + rlwinm r8, r8, 0, 0xfff80000 + ori r8, r8, 0xf0 | _PAGE_DIRTY | _PAGE_SPS | _PAGE_SH | \ + _PAGE_NO_CACHE | _PAGE_PRESENT + mtspr SPRN_MD_CTR, r5 + mtspr SPRN_MD_EPN, r0 + mtspr SPRN_MD_TWC, r7 + mtspr SPRN_MD_RPN, r8 +#endif +#if defined(CONFIG_PIN_TLB_IMMR) || defined(CONFIG_PIN_TLB_DATA) + lis r0, (MD_RSV4I | MD_TWAM)@h + mtspr SPRN_MD_CTR, r0 +#endif + mtspr SPRN_SRR1, r10 + mtspr SPRN_SRR0, r11 + rfi diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S new file mode 100644 index 000000000..519b60695 --- /dev/null +++ b/arch/powerpc/kernel/head_book3s_32.S @@ -0,0 +1,1204 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * PowerPC version + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * + * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP + * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> + * Adapted for Power Macintosh by Paul Mackerras. + * Low-level exception handlers and MMU support + * rewritten by Paul Mackerras. + * Copyright (C) 1996 Paul Mackerras. + * MPC8xx modifications Copyright (C) 1997 Dan Malek (dmalek@jlc.net). + * + * This file contains the low-level support and setup for the + * PowerPC platform, including trap and interrupt dispatch. + * (The PPC 8xx embedded CPUs use head_8xx.S instead.) + */ + +#include <linux/init.h> +#include <linux/pgtable.h> +#include <asm/reg.h> +#include <asm/page.h> +#include <asm/mmu.h> +#include <asm/cputable.h> +#include <asm/cache.h> +#include <asm/thread_info.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/ptrace.h> +#include <asm/bug.h> +#include <asm/kvm_book3s_asm.h> +#include <asm/export.h> +#include <asm/feature-fixups.h> +#include <asm/interrupt.h> + +#include "head_32.h" + +#define LOAD_BAT(n, reg, RA, RB) \ + /* see the comment for clear_bats() -- Cort */ \ + li RA,0; \ + mtspr SPRN_IBAT##n##U,RA; \ + mtspr SPRN_DBAT##n##U,RA; \ + lwz RA,(n*16)+0(reg); \ + lwz RB,(n*16)+4(reg); \ + mtspr SPRN_IBAT##n##U,RA; \ + mtspr SPRN_IBAT##n##L,RB; \ + lwz RA,(n*16)+8(reg); \ + lwz RB,(n*16)+12(reg); \ + mtspr SPRN_DBAT##n##U,RA; \ + mtspr SPRN_DBAT##n##L,RB + + __HEAD +_GLOBAL(_stext); + +/* + * _start is defined this way because the XCOFF loader in the OpenFirmware + * on the powermac expects the entry point to be a procedure descriptor. + */ +_GLOBAL(_start); + /* + * These are here for legacy reasons, the kernel used to + * need to look like a coff function entry for the pmac + * but we're always started by some kind of bootloader now. + * -- Cort + */ + nop /* used by __secondary_hold on prep (mtx) and chrp smp */ + nop /* used by __secondary_hold on prep (mtx) and chrp smp */ + nop + +/* PMAC + * Enter here with the kernel text, data and bss loaded starting at + * 0, running with virtual == physical mapping. + * r5 points to the prom entry point (the client interface handler + * address). Address translation is turned on, with the prom + * managing the hash table. Interrupts are disabled. The stack + * pointer (r1) points to just below the end of the half-meg region + * from 0x380000 - 0x400000, which is mapped in already. + * + * If we are booted from MacOS via BootX, we enter with the kernel + * image loaded somewhere, and the following values in registers: + * r3: 'BooX' (0x426f6f58) + * r4: virtual address of boot_infos_t + * r5: 0 + * + * PREP + * This is jumped to on prep systems right after the kernel is relocated + * to its proper place in memory by the boot loader. The expected layout + * of the regs is: + * r3: ptr to residual data + * r4: initrd_start or if no initrd then 0 + * r5: initrd_end - unused if r4 is 0 + * r6: Start of command line string + * r7: End of command line string + * + * This just gets a minimal mmu environment setup so we can call + * start_here() to do the real work. + * -- Cort + */ + + .globl __start +__start: +/* + * We have to do any OF calls before we map ourselves to KERNELBASE, + * because OF may have I/O devices mapped into that area + * (particularly on CHRP). + */ + cmpwi 0,r5,0 + beq 1f + +#ifdef CONFIG_PPC_OF_BOOT_TRAMPOLINE + /* find out where we are now */ + bcl 20,31,$+4 +0: mflr r8 /* r8 = runtime addr here */ + addis r8,r8,(_stext - 0b)@ha + addi r8,r8,(_stext - 0b)@l /* current runtime base addr */ + bl prom_init +#endif /* CONFIG_PPC_OF_BOOT_TRAMPOLINE */ + + /* We never return. We also hit that trap if trying to boot + * from OF while CONFIG_PPC_OF_BOOT_TRAMPOLINE isn't selected */ + trap + +/* + * Check for BootX signature when supporting PowerMac and branch to + * appropriate trampoline if it's present + */ +#ifdef CONFIG_PPC_PMAC +1: lis r31,0x426f + ori r31,r31,0x6f58 + cmpw 0,r3,r31 + bne 1f + bl bootx_init + trap +#endif /* CONFIG_PPC_PMAC */ + +1: mr r31,r3 /* save device tree ptr */ + li r24,0 /* cpu # */ + +/* + * early_init() does the early machine identification and does + * the necessary low-level setup and clears the BSS + * -- Cort <cort@fsmlabs.com> + */ + bl early_init + +/* Switch MMU off, clear BATs and flush TLB. At this point, r3 contains + * the physical address we are running at, returned by early_init() + */ + bl mmu_off +__after_mmu_off: + bl clear_bats + bl flush_tlbs + + bl initial_bats + bl load_segment_registers + bl reloc_offset + bl early_hash_table +#if defined(CONFIG_BOOTX_TEXT) + bl setup_disp_bat +#endif +#ifdef CONFIG_PPC_EARLY_DEBUG_CPM + bl setup_cpm_bat +#endif +#ifdef CONFIG_PPC_EARLY_DEBUG_USBGECKO + bl setup_usbgecko_bat +#endif + +/* + * Call setup_cpu for CPU 0 and initialize 6xx Idle + */ + bl reloc_offset + li r24,0 /* cpu# */ + bl call_setup_cpu /* Call setup_cpu for this CPU */ + bl reloc_offset + bl init_idle_6xx + + +/* + * We need to run with _start at physical address 0. + * On CHRP, we are loaded at 0x10000 since OF on CHRP uses + * the exception vectors at 0 (and therefore this copy + * overwrites OF's exception vectors with our own). + * The MMU is off at this point. + */ + bl reloc_offset + mr r26,r3 + addis r4,r3,KERNELBASE@h /* current address of _start */ + lis r5,PHYSICAL_START@h + cmplw 0,r4,r5 /* already running at PHYSICAL_START? */ + bne relocate_kernel +/* + * we now have the 1st 16M of ram mapped with the bats. + * prep needs the mmu to be turned on here, but pmac already has it on. + * this shouldn't bother the pmac since it just gets turned on again + * as we jump to our code at KERNELBASE. -- Cort + * Actually no, pmac doesn't have it on any more. BootX enters with MMU + * off, and in other cases, we now turn it off before changing BATs above. + */ +turn_on_mmu: + mfmsr r0 + ori r0,r0,MSR_DR|MSR_IR|MSR_RI + mtspr SPRN_SRR1,r0 + lis r0,start_here@h + ori r0,r0,start_here@l + mtspr SPRN_SRR0,r0 + rfi /* enables MMU */ + +/* + * We need __secondary_hold as a place to hold the other cpus on + * an SMP machine, even when we are running a UP kernel. + */ + . = 0xc0 /* for prep bootloader */ + li r3,1 /* MTX only has 1 cpu */ + .globl __secondary_hold +__secondary_hold: + /* tell the master we're here */ + stw r3,__secondary_hold_acknowledge@l(0) +#ifdef CONFIG_SMP +100: lwz r4,0(0) + /* wait until we're told to start */ + cmpw 0,r4,r3 + bne 100b + /* our cpu # was at addr 0 - go */ + mr r24,r3 /* cpu # */ + b __secondary_start +#else + b . +#endif /* CONFIG_SMP */ + + .globl __secondary_hold_spinloop +__secondary_hold_spinloop: + .long 0 + .globl __secondary_hold_acknowledge +__secondary_hold_acknowledge: + .long -1 + +/* System reset */ +/* core99 pmac starts the seconary here by changing the vector, and + putting it back to what it was (unknown_async_exception) when done. */ + EXCEPTION(INTERRUPT_SYSTEM_RESET, Reset, unknown_async_exception) + +/* Machine check */ +/* + * On CHRP, this is complicated by the fact that we could get a + * machine check inside RTAS, and we have no guarantee that certain + * critical registers will have the values we expect. The set of + * registers that might have bad values includes all the GPRs + * and all the BATs. We indicate that we are in RTAS by putting + * a non-zero value, the address of the exception frame to use, + * in thread.rtas_sp. The machine check handler checks thread.rtas_sp + * and uses its value if it is non-zero. + * (Other exception handlers assume that r1 is a valid kernel stack + * pointer when we take an exception from supervisor mode.) + * -- paulus. + */ + START_EXCEPTION(INTERRUPT_MACHINE_CHECK, MachineCheck) + EXCEPTION_PROLOG_0 +#ifdef CONFIG_PPC_CHRP + mtspr SPRN_SPRG_SCRATCH2,r1 + mfspr r1, SPRN_SPRG_THREAD + lwz r1, RTAS_SP(r1) + cmpwi cr1, r1, 0 + bne cr1, 7f + mfspr r1, SPRN_SPRG_SCRATCH2 +#endif /* CONFIG_PPC_CHRP */ + EXCEPTION_PROLOG_1 +7: EXCEPTION_PROLOG_2 0x200 MachineCheck +#ifdef CONFIG_PPC_CHRP + beq cr1, 1f + twi 31, 0, 0 +#endif +1: prepare_transfer_to_handler + bl machine_check_exception + b interrupt_return + +/* Data access exception. */ + START_EXCEPTION(INTERRUPT_DATA_STORAGE, DataAccess) +#ifdef CONFIG_PPC_BOOK3S_604 +BEGIN_MMU_FTR_SECTION + mtspr SPRN_SPRG_SCRATCH2,r10 + mfspr r10, SPRN_SPRG_THREAD + stw r11, THR11(r10) + mfspr r10, SPRN_DSISR + mfcr r11 + andis. r10, r10, (DSISR_BAD_FAULT_32S | DSISR_DABRMATCH)@h + mfspr r10, SPRN_SPRG_THREAD + beq hash_page_dsi +.Lhash_page_dsi_cont: + mtcr r11 + lwz r11, THR11(r10) + mfspr r10, SPRN_SPRG_SCRATCH2 +MMU_FTR_SECTION_ELSE + b 1f +ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_HPTE_TABLE) +#endif +1: EXCEPTION_PROLOG_0 handle_dar_dsisr=1 + EXCEPTION_PROLOG_1 + EXCEPTION_PROLOG_2 INTERRUPT_DATA_STORAGE DataAccess handle_dar_dsisr=1 + prepare_transfer_to_handler + lwz r5, _DSISR(r1) + andis. r0, r5, DSISR_DABRMATCH@h + bne- 1f + bl do_page_fault + b interrupt_return +1: bl do_break + REST_NVGPRS(r1) + b interrupt_return + + +/* Instruction access exception. */ + START_EXCEPTION(INTERRUPT_INST_STORAGE, InstructionAccess) + mtspr SPRN_SPRG_SCRATCH0,r10 + mtspr SPRN_SPRG_SCRATCH1,r11 + mfspr r10, SPRN_SPRG_THREAD + mfspr r11, SPRN_SRR0 + stw r11, SRR0(r10) + mfspr r11, SPRN_SRR1 /* check whether user or kernel */ + stw r11, SRR1(r10) + mfcr r10 +#ifdef CONFIG_PPC_BOOK3S_604 +BEGIN_MMU_FTR_SECTION + andis. r11, r11, SRR1_ISI_NOPT@h /* no pte found? */ + bne hash_page_isi +.Lhash_page_isi_cont: + mfspr r11, SPRN_SRR1 /* check whether user or kernel */ +END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE) +#endif + andi. r11, r11, MSR_PR + + EXCEPTION_PROLOG_1 + EXCEPTION_PROLOG_2 INTERRUPT_INST_STORAGE InstructionAccess + andis. r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */ + stw r5, _DSISR(r11) + stw r12, _DAR(r11) + prepare_transfer_to_handler + bl do_page_fault + b interrupt_return + +/* External interrupt */ + EXCEPTION(INTERRUPT_EXTERNAL, HardwareInterrupt, do_IRQ) + +/* Alignment exception */ + START_EXCEPTION(INTERRUPT_ALIGNMENT, Alignment) + EXCEPTION_PROLOG INTERRUPT_ALIGNMENT Alignment handle_dar_dsisr=1 + prepare_transfer_to_handler + bl alignment_exception + REST_NVGPRS(r1) + b interrupt_return + +/* Program check exception */ + START_EXCEPTION(INTERRUPT_PROGRAM, ProgramCheck) + EXCEPTION_PROLOG INTERRUPT_PROGRAM ProgramCheck + prepare_transfer_to_handler + bl program_check_exception + REST_NVGPRS(r1) + b interrupt_return + +/* Floating-point unavailable */ + START_EXCEPTION(0x800, FPUnavailable) +#ifdef CONFIG_PPC_FPU +BEGIN_FTR_SECTION +/* + * Certain Freescale cores don't have a FPU and treat fp instructions + * as a FP Unavailable exception. Redirect to illegal/emulation handling. + */ + b ProgramCheck +END_FTR_SECTION_IFSET(CPU_FTR_FPU_UNAVAILABLE) + EXCEPTION_PROLOG INTERRUPT_FP_UNAVAIL FPUnavailable + beq 1f + bl load_up_fpu /* if from user, just load it up */ + b fast_exception_return +1: prepare_transfer_to_handler + bl kernel_fp_unavailable_exception + b interrupt_return +#else + b ProgramCheck +#endif + +/* Decrementer */ + EXCEPTION(INTERRUPT_DECREMENTER, Decrementer, timer_interrupt) + + EXCEPTION(0xa00, Trap_0a, unknown_exception) + EXCEPTION(0xb00, Trap_0b, unknown_exception) + +/* System call */ + START_EXCEPTION(INTERRUPT_SYSCALL, SystemCall) + SYSCALL_ENTRY INTERRUPT_SYSCALL + + EXCEPTION(INTERRUPT_TRACE, SingleStep, single_step_exception) + EXCEPTION(0xe00, Trap_0e, unknown_exception) + +/* + * The Altivec unavailable trap is at 0x0f20. Foo. + * We effectively remap it to 0x3000. + * We include an altivec unavailable exception vector even if + * not configured for Altivec, so that you can't panic a + * non-altivec kernel running on a machine with altivec just + * by executing an altivec instruction. + */ + START_EXCEPTION(INTERRUPT_PERFMON, PerformanceMonitorTrap) + b PerformanceMonitor + + START_EXCEPTION(INTERRUPT_ALTIVEC_UNAVAIL, AltiVecUnavailableTrap) + b AltiVecUnavailable + + __HEAD +/* + * Handle TLB miss for instruction on 603/603e. + * Note: we get an alternate set of r0 - r3 to use automatically. + */ + . = INTERRUPT_INST_TLB_MISS_603 +InstructionTLBMiss: +/* + * r0: scratch + * r1: linux style pte ( later becomes ppc hardware pte ) + * r2: ptr to linux-style pte + * r3: scratch + */ + /* Get PTE (linux-style) and check access */ + mfspr r3,SPRN_IMISS +#ifdef CONFIG_MODULES + lis r1, TASK_SIZE@h /* check if kernel address */ + cmplw 0,r1,r3 +#endif + mfspr r2, SPRN_SDR1 + li r1,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC | _PAGE_USER + rlwinm r2, r2, 28, 0xfffff000 +#ifdef CONFIG_MODULES + bgt- 112f + lis r2, (swapper_pg_dir - PAGE_OFFSET)@ha /* if kernel address, use */ + li r1,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC + addi r2, r2, (swapper_pg_dir - PAGE_OFFSET)@l /* kernel page table */ +#endif +112: rlwimi r2,r3,12,20,29 /* insert top 10 bits of address */ + lwz r2,0(r2) /* get pmd entry */ + rlwinm. r2,r2,0,0,19 /* extract address of pte page */ + beq- InstructionAddressInvalid /* return if no mapping */ + rlwimi r2,r3,22,20,29 /* insert next 10 bits of address */ + lwz r0,0(r2) /* get linux-style pte */ + andc. r1,r1,r0 /* check access & ~permission */ + bne- InstructionAddressInvalid /* return if access not permitted */ + /* Convert linux-style PTE to low word of PPC-style PTE */ + rlwimi r0,r0,32-2,31,31 /* _PAGE_USER -> PP lsb */ + ori r1, r1, 0xe06 /* clear out reserved bits */ + andc r1, r0, r1 /* PP = user? 1 : 0 */ +BEGIN_FTR_SECTION + rlwinm r1,r1,0,~_PAGE_COHERENT /* clear M (coherence not required) */ +END_FTR_SECTION_IFCLR(CPU_FTR_NEED_COHERENT) + mtspr SPRN_RPA,r1 + tlbli r3 + mfspr r3,SPRN_SRR1 /* Need to restore CR0 */ + mtcrf 0x80,r3 + rfi +InstructionAddressInvalid: + mfspr r3,SPRN_SRR1 + rlwinm r1,r3,9,6,6 /* Get load/store bit */ + + addis r1,r1,0x2000 + mtspr SPRN_DSISR,r1 /* (shouldn't be needed) */ + andi. r2,r3,0xFFFF /* Clear upper bits of SRR1 */ + or r2,r2,r1 + mtspr SPRN_SRR1,r2 + mfspr r1,SPRN_IMISS /* Get failing address */ + rlwinm. r2,r2,0,31,31 /* Check for little endian access */ + rlwimi r2,r2,1,30,30 /* change 1 -> 3 */ + xor r1,r1,r2 + mtspr SPRN_DAR,r1 /* Set fault address */ + mfmsr r0 /* Restore "normal" registers */ + xoris r0,r0,MSR_TGPR>>16 + mtcrf 0x80,r3 /* Restore CR0 */ + mtmsr r0 + b InstructionAccess + +/* + * Handle TLB miss for DATA Load operation on 603/603e + */ + . = INTERRUPT_DATA_LOAD_TLB_MISS_603 +DataLoadTLBMiss: +/* + * r0: scratch + * r1: linux style pte ( later becomes ppc hardware pte ) + * r2: ptr to linux-style pte + * r3: scratch + */ + /* Get PTE (linux-style) and check access */ + mfspr r3,SPRN_DMISS + lis r1, TASK_SIZE@h /* check if kernel address */ + cmplw 0,r1,r3 + mfspr r2, SPRN_SDR1 + li r1, _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_USER + rlwinm r2, r2, 28, 0xfffff000 + bgt- 112f + lis r2, (swapper_pg_dir - PAGE_OFFSET)@ha /* if kernel address, use */ + li r1, _PAGE_PRESENT | _PAGE_ACCESSED + addi r2, r2, (swapper_pg_dir - PAGE_OFFSET)@l /* kernel page table */ +112: rlwimi r2,r3,12,20,29 /* insert top 10 bits of address */ + lwz r2,0(r2) /* get pmd entry */ + rlwinm. r2,r2,0,0,19 /* extract address of pte page */ + beq- DataAddressInvalid /* return if no mapping */ + rlwimi r2,r3,22,20,29 /* insert next 10 bits of address */ + lwz r0,0(r2) /* get linux-style pte */ + andc. r1,r1,r0 /* check access & ~permission */ + bne- DataAddressInvalid /* return if access not permitted */ + /* Convert linux-style PTE to low word of PPC-style PTE */ + rlwinm r1,r0,32-9,30,30 /* _PAGE_RW -> PP msb */ + rlwimi r0,r0,32-1,30,30 /* _PAGE_USER -> PP msb */ + rlwimi r1,r0,32-3,24,24 /* _PAGE_RW -> _PAGE_DIRTY */ + rlwimi r0,r0,32-1,31,31 /* _PAGE_USER -> PP lsb */ + xori r1,r1,_PAGE_DIRTY /* clear dirty when not rw */ + ori r1,r1,0xe04 /* clear out reserved bits */ + andc r1,r0,r1 /* PP = user? rw? 1: 3: 0 */ +BEGIN_FTR_SECTION + rlwinm r1,r1,0,~_PAGE_COHERENT /* clear M (coherence not required) */ +END_FTR_SECTION_IFCLR(CPU_FTR_NEED_COHERENT) + mtspr SPRN_RPA,r1 +BEGIN_MMU_FTR_SECTION + li r0,1 + mfspr r1,SPRN_SPRG_603_LRU + rlwinm r2,r3,20,27,31 /* Get Address bits 15:19 */ + slw r0,r0,r2 + xor r1,r0,r1 + srw r0,r1,r2 + mtspr SPRN_SPRG_603_LRU,r1 + mfspr r2,SPRN_SRR1 + rlwimi r2,r0,31-14,14,14 + mtspr SPRN_SRR1,r2 + mtcrf 0x80,r2 + tlbld r3 + rfi +MMU_FTR_SECTION_ELSE + mfspr r2,SPRN_SRR1 /* Need to restore CR0 */ + mtcrf 0x80,r2 + tlbld r3 + rfi +ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_NEED_DTLB_SW_LRU) +DataAddressInvalid: + mfspr r3,SPRN_SRR1 + rlwinm r1,r3,9,6,6 /* Get load/store bit */ + addis r1,r1,0x2000 + mtspr SPRN_DSISR,r1 + andi. r2,r3,0xFFFF /* Clear upper bits of SRR1 */ + mtspr SPRN_SRR1,r2 + mfspr r1,SPRN_DMISS /* Get failing address */ + rlwinm. r2,r2,0,31,31 /* Check for little endian access */ + beq 20f /* Jump if big endian */ + xori r1,r1,3 +20: mtspr SPRN_DAR,r1 /* Set fault address */ + mfmsr r0 /* Restore "normal" registers */ + xoris r0,r0,MSR_TGPR>>16 + mtcrf 0x80,r3 /* Restore CR0 */ + mtmsr r0 + b DataAccess + +/* + * Handle TLB miss for DATA Store on 603/603e + */ + . = INTERRUPT_DATA_STORE_TLB_MISS_603 +DataStoreTLBMiss: +/* + * r0: scratch + * r1: linux style pte ( later becomes ppc hardware pte ) + * r2: ptr to linux-style pte + * r3: scratch + */ + /* Get PTE (linux-style) and check access */ + mfspr r3,SPRN_DMISS + lis r1, TASK_SIZE@h /* check if kernel address */ + cmplw 0,r1,r3 + mfspr r2, SPRN_SDR1 + li r1, _PAGE_RW | _PAGE_DIRTY | _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_USER + rlwinm r2, r2, 28, 0xfffff000 + bgt- 112f + lis r2, (swapper_pg_dir - PAGE_OFFSET)@ha /* if kernel address, use */ + li r1, _PAGE_RW | _PAGE_DIRTY | _PAGE_PRESENT | _PAGE_ACCESSED + addi r2, r2, (swapper_pg_dir - PAGE_OFFSET)@l /* kernel page table */ +112: rlwimi r2,r3,12,20,29 /* insert top 10 bits of address */ + lwz r2,0(r2) /* get pmd entry */ + rlwinm. r2,r2,0,0,19 /* extract address of pte page */ + beq- DataAddressInvalid /* return if no mapping */ + rlwimi r2,r3,22,20,29 /* insert next 10 bits of address */ + lwz r0,0(r2) /* get linux-style pte */ + andc. r1,r1,r0 /* check access & ~permission */ + bne- DataAddressInvalid /* return if access not permitted */ + /* Convert linux-style PTE to low word of PPC-style PTE */ + rlwimi r0,r0,32-2,31,31 /* _PAGE_USER -> PP lsb */ + li r1,0xe06 /* clear out reserved bits & PP msb */ + andc r1,r0,r1 /* PP = user? 1: 0 */ +BEGIN_FTR_SECTION + rlwinm r1,r1,0,~_PAGE_COHERENT /* clear M (coherence not required) */ +END_FTR_SECTION_IFCLR(CPU_FTR_NEED_COHERENT) + mtspr SPRN_RPA,r1 + mfspr r2,SPRN_SRR1 /* Need to restore CR0 */ + mtcrf 0x80,r2 +BEGIN_MMU_FTR_SECTION + li r0,1 + mfspr r1,SPRN_SPRG_603_LRU + rlwinm r2,r3,20,27,31 /* Get Address bits 15:19 */ + slw r0,r0,r2 + xor r1,r0,r1 + srw r0,r1,r2 + mtspr SPRN_SPRG_603_LRU,r1 + mfspr r2,SPRN_SRR1 + rlwimi r2,r0,31-14,14,14 + mtspr SPRN_SRR1,r2 + mtcrf 0x80,r2 + tlbld r3 + rfi +MMU_FTR_SECTION_ELSE + mfspr r2,SPRN_SRR1 /* Need to restore CR0 */ + mtcrf 0x80,r2 + tlbld r3 + rfi +ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_NEED_DTLB_SW_LRU) + +#ifndef CONFIG_ALTIVEC +#define altivec_assist_exception unknown_exception +#endif + +#ifndef CONFIG_TAU_INT +#define TAUException unknown_async_exception +#endif + + EXCEPTION(0x1300, Trap_13, instruction_breakpoint_exception) + EXCEPTION(0x1400, SMI, SMIException) + EXCEPTION(0x1500, Trap_15, unknown_exception) + EXCEPTION(0x1600, Trap_16, altivec_assist_exception) + EXCEPTION(0x1700, Trap_17, TAUException) + EXCEPTION(0x1800, Trap_18, unknown_exception) + EXCEPTION(0x1900, Trap_19, unknown_exception) + EXCEPTION(0x1a00, Trap_1a, unknown_exception) + EXCEPTION(0x1b00, Trap_1b, unknown_exception) + EXCEPTION(0x1c00, Trap_1c, unknown_exception) + EXCEPTION(0x1d00, Trap_1d, unknown_exception) + EXCEPTION(0x1e00, Trap_1e, unknown_exception) + EXCEPTION(0x1f00, Trap_1f, unknown_exception) + EXCEPTION(0x2000, RunMode, RunModeException) + EXCEPTION(0x2100, Trap_21, unknown_exception) + EXCEPTION(0x2200, Trap_22, unknown_exception) + EXCEPTION(0x2300, Trap_23, unknown_exception) + EXCEPTION(0x2400, Trap_24, unknown_exception) + EXCEPTION(0x2500, Trap_25, unknown_exception) + EXCEPTION(0x2600, Trap_26, unknown_exception) + EXCEPTION(0x2700, Trap_27, unknown_exception) + EXCEPTION(0x2800, Trap_28, unknown_exception) + EXCEPTION(0x2900, Trap_29, unknown_exception) + EXCEPTION(0x2a00, Trap_2a, unknown_exception) + EXCEPTION(0x2b00, Trap_2b, unknown_exception) + EXCEPTION(0x2c00, Trap_2c, unknown_exception) + EXCEPTION(0x2d00, Trap_2d, unknown_exception) + EXCEPTION(0x2e00, Trap_2e, unknown_exception) + EXCEPTION(0x2f00, Trap_2f, unknown_exception) + + __HEAD + . = 0x3000 + +#ifdef CONFIG_PPC_BOOK3S_604 +.macro save_regs_thread thread + stw r0, THR0(\thread) + stw r3, THR3(\thread) + stw r4, THR4(\thread) + stw r5, THR5(\thread) + stw r6, THR6(\thread) + stw r8, THR8(\thread) + stw r9, THR9(\thread) + mflr r0 + stw r0, THLR(\thread) + mfctr r0 + stw r0, THCTR(\thread) +.endm + +.macro restore_regs_thread thread + lwz r0, THLR(\thread) + mtlr r0 + lwz r0, THCTR(\thread) + mtctr r0 + lwz r0, THR0(\thread) + lwz r3, THR3(\thread) + lwz r4, THR4(\thread) + lwz r5, THR5(\thread) + lwz r6, THR6(\thread) + lwz r8, THR8(\thread) + lwz r9, THR9(\thread) +.endm + +hash_page_dsi: + save_regs_thread r10 + mfdsisr r3 + mfdar r4 + mfsrr0 r5 + mfsrr1 r9 + rlwinm r3, r3, 32 - 15, _PAGE_RW /* DSISR_STORE -> _PAGE_RW */ + bl hash_page + mfspr r10, SPRN_SPRG_THREAD + restore_regs_thread r10 + b .Lhash_page_dsi_cont + +hash_page_isi: + mr r11, r10 + mfspr r10, SPRN_SPRG_THREAD + save_regs_thread r10 + li r3, 0 + lwz r4, SRR0(r10) + lwz r9, SRR1(r10) + bl hash_page + mfspr r10, SPRN_SPRG_THREAD + restore_regs_thread r10 + mr r10, r11 + b .Lhash_page_isi_cont + + .globl fast_hash_page_return +fast_hash_page_return: + andis. r10, r9, SRR1_ISI_NOPT@h /* Set on ISI, cleared on DSI */ + mfspr r10, SPRN_SPRG_THREAD + restore_regs_thread r10 + bne 1f + + /* DSI */ + mtcr r11 + lwz r11, THR11(r10) + mfspr r10, SPRN_SPRG_SCRATCH2 + rfi + +1: /* ISI */ + mtcr r11 + mfspr r11, SPRN_SPRG_SCRATCH1 + mfspr r10, SPRN_SPRG_SCRATCH0 + rfi +#endif /* CONFIG_PPC_BOOK3S_604 */ + +#ifdef CONFIG_VMAP_STACK + vmap_stack_overflow_exception +#endif + + __HEAD +AltiVecUnavailable: + EXCEPTION_PROLOG 0xf20 AltiVecUnavailable +#ifdef CONFIG_ALTIVEC + beq 1f + bl load_up_altivec /* if from user, just load it up */ + b fast_exception_return +#endif /* CONFIG_ALTIVEC */ +1: prepare_transfer_to_handler + bl altivec_unavailable_exception + b interrupt_return + + __HEAD +PerformanceMonitor: + EXCEPTION_PROLOG 0xf00 PerformanceMonitor + prepare_transfer_to_handler + bl performance_monitor_exception + b interrupt_return + + + __HEAD +/* + * This code is jumped to from the startup code to copy + * the kernel image to physical address PHYSICAL_START. + */ +relocate_kernel: + lis r3,PHYSICAL_START@h /* Destination base address */ + li r6,0 /* Destination offset */ + li r5,0x4000 /* # bytes of memory to copy */ + bl copy_and_flush /* copy the first 0x4000 bytes */ + addi r0,r3,4f@l /* jump to the address of 4f */ + mtctr r0 /* in copy and do the rest. */ + bctr /* jump to the copy */ +4: lis r5,_end-KERNELBASE@h + ori r5,r5,_end-KERNELBASE@l + bl copy_and_flush /* copy the rest */ + b turn_on_mmu + +/* + * Copy routine used to copy the kernel to start at physical address 0 + * and flush and invalidate the caches as needed. + * r3 = dest addr, r4 = source addr, r5 = copy limit, r6 = start offset + * on exit, r3, r4, r5 are unchanged, r6 is updated to be >= r5. + */ +_GLOBAL(copy_and_flush) + addi r5,r5,-4 + addi r6,r6,-4 +4: li r0,L1_CACHE_BYTES/4 + mtctr r0 +3: addi r6,r6,4 /* copy a cache line */ + lwzx r0,r6,r4 + stwx r0,r6,r3 + bdnz 3b + dcbst r6,r3 /* write it to memory */ + sync + icbi r6,r3 /* flush the icache line */ + cmplw 0,r6,r5 + blt 4b + sync /* additional sync needed on g4 */ + isync + addi r5,r5,4 + addi r6,r6,4 + blr + +#ifdef CONFIG_SMP + .globl __secondary_start_mpc86xx +__secondary_start_mpc86xx: + mfspr r3, SPRN_PIR + stw r3, __secondary_hold_acknowledge@l(0) + mr r24, r3 /* cpu # */ + b __secondary_start + + .globl __secondary_start_pmac_0 +__secondary_start_pmac_0: + /* NB the entries for cpus 0, 1, 2 must each occupy 8 bytes. */ + li r24,0 + b 1f + li r24,1 + b 1f + li r24,2 + b 1f + li r24,3 +1: + /* on powersurge, we come in here with IR=0 and DR=1, and DBAT 0 + set to map the 0xf0000000 - 0xffffffff region */ + mfmsr r0 + rlwinm r0,r0,0,28,26 /* clear DR (0x10) */ + mtmsr r0 + isync + + .globl __secondary_start +__secondary_start: + /* Copy some CPU settings from CPU 0 */ + bl __restore_cpu_setup + + lis r3,-KERNELBASE@h + mr r4,r24 + bl call_setup_cpu /* Call setup_cpu for this CPU */ + lis r3,-KERNELBASE@h + bl init_idle_6xx + + /* get current's stack and current */ + lis r2,secondary_current@ha + tophys(r2,r2) + lwz r2,secondary_current@l(r2) + tophys(r1,r2) + lwz r1,TASK_STACK(r1) + + /* stack */ + addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD + li r0,0 + tophys(r3,r1) + stw r0,0(r3) + + /* load up the MMU */ + bl load_segment_registers + bl load_up_mmu + + /* ptr to phys current thread */ + tophys(r4,r2) + addi r4,r4,THREAD /* phys address of our thread_struct */ + mtspr SPRN_SPRG_THREAD,r4 +BEGIN_MMU_FTR_SECTION + lis r4, (swapper_pg_dir - PAGE_OFFSET)@h + ori r4, r4, (swapper_pg_dir - PAGE_OFFSET)@l + rlwinm r4, r4, 4, 0xffff01ff + mtspr SPRN_SDR1, r4 +END_MMU_FTR_SECTION_IFCLR(MMU_FTR_HPTE_TABLE) + + /* enable MMU and jump to start_secondary */ + li r4,MSR_KERNEL + lis r3,start_secondary@h + ori r3,r3,start_secondary@l + mtspr SPRN_SRR0,r3 + mtspr SPRN_SRR1,r4 + rfi +#endif /* CONFIG_SMP */ + +#ifdef CONFIG_KVM_BOOK3S_HANDLER +#include "../kvm/book3s_rmhandlers.S" +#endif + +/* + * Load stuff into the MMU. Intended to be called with + * IR=0 and DR=0. + */ +early_hash_table: + sync /* Force all PTE updates to finish */ + isync + tlbia /* Clear all TLB entries */ + sync /* wait for tlbia/tlbie to finish */ + TLBSYNC /* ... on all CPUs */ + /* Load the SDR1 register (hash table base & size) */ + lis r6, early_hash - PAGE_OFFSET@h + ori r6, r6, 3 /* 256kB table */ + mtspr SPRN_SDR1, r6 + blr + +load_up_mmu: + sync /* Force all PTE updates to finish */ + isync + tlbia /* Clear all TLB entries */ + sync /* wait for tlbia/tlbie to finish */ + TLBSYNC /* ... on all CPUs */ +BEGIN_MMU_FTR_SECTION + /* Load the SDR1 register (hash table base & size) */ + lis r6,_SDR1@ha + tophys(r6,r6) + lwz r6,_SDR1@l(r6) + mtspr SPRN_SDR1,r6 +END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE) + +/* Load the BAT registers with the values set up by MMU_init. */ + lis r3,BATS@ha + addi r3,r3,BATS@l + tophys(r3,r3) + LOAD_BAT(0,r3,r4,r5) + LOAD_BAT(1,r3,r4,r5) + LOAD_BAT(2,r3,r4,r5) + LOAD_BAT(3,r3,r4,r5) +BEGIN_MMU_FTR_SECTION + LOAD_BAT(4,r3,r4,r5) + LOAD_BAT(5,r3,r4,r5) + LOAD_BAT(6,r3,r4,r5) + LOAD_BAT(7,r3,r4,r5) +END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS) + blr + +_GLOBAL(load_segment_registers) + li r0, NUM_USER_SEGMENTS /* load up user segment register values */ + mtctr r0 /* for context 0 */ +#ifdef CONFIG_PPC_KUEP + lis r3, SR_NX@h /* Kp = 0, Ks = 0, VSID = 0 */ +#else + li r3, 0 /* Kp = 0, Ks = 0, VSID = 0 */ +#endif + li r4, 0 +3: mtsrin r3, r4 + addi r3, r3, 0x111 /* increment VSID */ + addis r4, r4, 0x1000 /* address of next segment */ + bdnz 3b + li r0, 16 - NUM_USER_SEGMENTS /* load up kernel segment registers */ + mtctr r0 /* for context 0 */ + rlwinm r3, r3, 0, ~SR_NX /* Nx = 0 */ + rlwinm r3, r3, 0, ~SR_KS /* Ks = 0 */ + oris r3, r3, SR_KP@h /* Kp = 1 */ +3: mtsrin r3, r4 + addi r3, r3, 0x111 /* increment VSID */ + addis r4, r4, 0x1000 /* address of next segment */ + bdnz 3b + blr + +/* + * This is where the main kernel code starts. + */ +start_here: + /* ptr to current */ + lis r2,init_task@h + ori r2,r2,init_task@l + /* Set up for using our exception vectors */ + /* ptr to phys current thread */ + tophys(r4,r2) + addi r4,r4,THREAD /* init task's THREAD */ + mtspr SPRN_SPRG_THREAD,r4 +BEGIN_MMU_FTR_SECTION + lis r4, (swapper_pg_dir - PAGE_OFFSET)@h + ori r4, r4, (swapper_pg_dir - PAGE_OFFSET)@l + rlwinm r4, r4, 4, 0xffff01ff + mtspr SPRN_SDR1, r4 +END_MMU_FTR_SECTION_IFCLR(MMU_FTR_HPTE_TABLE) + + /* stack */ + lis r1,init_thread_union@ha + addi r1,r1,init_thread_union@l + li r0,0 + stwu r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1) +/* + * Do early platform-specific initialization, + * and set up the MMU. + */ +#ifdef CONFIG_KASAN + bl kasan_early_init +#endif + li r3,0 + mr r4,r31 + bl machine_init + bl __save_cpu_setup + bl MMU_init + bl MMU_init_hw_patch + +/* + * Go back to running unmapped so we can load up new values + * for SDR1 (hash table pointer) and the segment registers + * and change to using our exception vectors. + */ + lis r4,2f@h + ori r4,r4,2f@l + tophys(r4,r4) + li r3,MSR_KERNEL & ~(MSR_IR|MSR_DR) + + .align 4 + mtspr SPRN_SRR0,r4 + mtspr SPRN_SRR1,r3 + rfi +/* Load up the kernel context */ +2: bl load_up_mmu + +#ifdef CONFIG_BDI_SWITCH + /* Add helper information for the Abatron bdiGDB debugger. + * We do this here because we know the mmu is disabled, and + * will be enabled for real in just a few instructions. + */ + lis r5, abatron_pteptrs@h + ori r5, r5, abatron_pteptrs@l + stw r5, 0xf0(0) /* This much match your Abatron config */ + lis r6, swapper_pg_dir@h + ori r6, r6, swapper_pg_dir@l + tophys(r5, r5) + stw r6, 0(r5) +#endif /* CONFIG_BDI_SWITCH */ + +/* Now turn on the MMU for real! */ + li r4,MSR_KERNEL + lis r3,start_kernel@h + ori r3,r3,start_kernel@l + mtspr SPRN_SRR0,r3 + mtspr SPRN_SRR1,r4 + rfi + +/* + * An undocumented "feature" of 604e requires that the v bit + * be cleared before changing BAT values. + * + * Also, newer IBM firmware does not clear bat3 and 4 so + * this makes sure it's done. + * -- Cort + */ +clear_bats: + li r10,0 + + mtspr SPRN_DBAT0U,r10 + mtspr SPRN_DBAT0L,r10 + mtspr SPRN_DBAT1U,r10 + mtspr SPRN_DBAT1L,r10 + mtspr SPRN_DBAT2U,r10 + mtspr SPRN_DBAT2L,r10 + mtspr SPRN_DBAT3U,r10 + mtspr SPRN_DBAT3L,r10 + mtspr SPRN_IBAT0U,r10 + mtspr SPRN_IBAT0L,r10 + mtspr SPRN_IBAT1U,r10 + mtspr SPRN_IBAT1L,r10 + mtspr SPRN_IBAT2U,r10 + mtspr SPRN_IBAT2L,r10 + mtspr SPRN_IBAT3U,r10 + mtspr SPRN_IBAT3L,r10 +BEGIN_MMU_FTR_SECTION + /* Here's a tweak: at this point, CPU setup have + * not been called yet, so HIGH_BAT_EN may not be + * set in HID0 for the 745x processors. However, it + * seems that doesn't affect our ability to actually + * write to these SPRs. + */ + mtspr SPRN_DBAT4U,r10 + mtspr SPRN_DBAT4L,r10 + mtspr SPRN_DBAT5U,r10 + mtspr SPRN_DBAT5L,r10 + mtspr SPRN_DBAT6U,r10 + mtspr SPRN_DBAT6L,r10 + mtspr SPRN_DBAT7U,r10 + mtspr SPRN_DBAT7L,r10 + mtspr SPRN_IBAT4U,r10 + mtspr SPRN_IBAT4L,r10 + mtspr SPRN_IBAT5U,r10 + mtspr SPRN_IBAT5L,r10 + mtspr SPRN_IBAT6U,r10 + mtspr SPRN_IBAT6L,r10 + mtspr SPRN_IBAT7U,r10 + mtspr SPRN_IBAT7L,r10 +END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS) + blr + +_GLOBAL(update_bats) + lis r4, 1f@h + ori r4, r4, 1f@l + tophys(r4, r4) + mfmsr r6 + mflr r7 + li r3, MSR_KERNEL & ~(MSR_IR | MSR_DR) + rlwinm r0, r6, 0, ~MSR_RI + rlwinm r0, r0, 0, ~MSR_EE + mtmsr r0 + + .align 4 + mtspr SPRN_SRR0, r4 + mtspr SPRN_SRR1, r3 + rfi +1: bl clear_bats + lis r3, BATS@ha + addi r3, r3, BATS@l + tophys(r3, r3) + LOAD_BAT(0, r3, r4, r5) + LOAD_BAT(1, r3, r4, r5) + LOAD_BAT(2, r3, r4, r5) + LOAD_BAT(3, r3, r4, r5) +BEGIN_MMU_FTR_SECTION + LOAD_BAT(4, r3, r4, r5) + LOAD_BAT(5, r3, r4, r5) + LOAD_BAT(6, r3, r4, r5) + LOAD_BAT(7, r3, r4, r5) +END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS) + li r3, MSR_KERNEL & ~(MSR_IR | MSR_DR | MSR_RI) + mtmsr r3 + mtspr SPRN_SRR0, r7 + mtspr SPRN_SRR1, r6 + rfi + +flush_tlbs: + lis r10, 0x40 +1: addic. r10, r10, -0x1000 + tlbie r10 + bgt 1b + sync + blr + +mmu_off: + addi r4, r3, __after_mmu_off - _start + mfmsr r3 + andi. r0,r3,MSR_DR|MSR_IR /* MMU enabled? */ + beqlr + andc r3,r3,r0 + + .align 4 + mtspr SPRN_SRR0,r4 + mtspr SPRN_SRR1,r3 + sync + rfi + +/* We use one BAT to map up to 256M of RAM at _PAGE_OFFSET */ +initial_bats: + lis r11,PAGE_OFFSET@h + tophys(r8,r11) +#ifdef CONFIG_SMP + ori r8,r8,0x12 /* R/W access, M=1 */ +#else + ori r8,r8,2 /* R/W access */ +#endif /* CONFIG_SMP */ + ori r11,r11,BL_256M<<2|0x2 /* set up BAT registers for 604 */ + + mtspr SPRN_DBAT0L,r8 /* N.B. 6xx have valid */ + mtspr SPRN_DBAT0U,r11 /* bit in upper BAT register */ + mtspr SPRN_IBAT0L,r8 + mtspr SPRN_IBAT0U,r11 + isync + blr + +#ifdef CONFIG_BOOTX_TEXT +setup_disp_bat: + /* + * setup the display bat prepared for us in prom.c + */ + mflr r8 + bl reloc_offset + mtlr r8 + addis r8,r3,disp_BAT@ha + addi r8,r8,disp_BAT@l + cmpwi cr0,r8,0 + beqlr + lwz r11,0(r8) + lwz r8,4(r8) + mtspr SPRN_DBAT3L,r8 + mtspr SPRN_DBAT3U,r11 + blr +#endif /* CONFIG_BOOTX_TEXT */ + +#ifdef CONFIG_PPC_EARLY_DEBUG_CPM +setup_cpm_bat: + lis r8, 0xf000 + ori r8, r8, 0x002a + mtspr SPRN_DBAT1L, r8 + + lis r11, 0xf000 + ori r11, r11, (BL_1M << 2) | 2 + mtspr SPRN_DBAT1U, r11 + + blr +#endif + +#ifdef CONFIG_PPC_EARLY_DEBUG_USBGECKO +setup_usbgecko_bat: + /* prepare a BAT for early io */ +#if defined(CONFIG_GAMECUBE) + lis r8, 0x0c00 +#elif defined(CONFIG_WII) + lis r8, 0x0d00 +#else +#error Invalid platform for USB Gecko based early debugging. +#endif + /* + * The virtual address used must match the virtual address + * associated to the fixmap entry FIX_EARLY_DEBUG_BASE. + */ + lis r11, 0xfffe /* top 128K */ + ori r8, r8, 0x002a /* uncached, guarded ,rw */ + ori r11, r11, 0x2 /* 128K, Vs=1, Vp=0 */ + mtspr SPRN_DBAT1L, r8 + mtspr SPRN_DBAT1U, r11 + blr +#endif + + .data diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h new file mode 100644 index 000000000..1cb9d0f7c --- /dev/null +++ b/arch/powerpc/kernel/head_booke.h @@ -0,0 +1,526 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __HEAD_BOOKE_H__ +#define __HEAD_BOOKE_H__ + +#include <asm/ptrace.h> /* for STACK_FRAME_REGS_MARKER */ +#include <asm/kvm_asm.h> +#include <asm/kvm_booke_hv_asm.h> + +#ifdef __ASSEMBLY__ + +/* + * Macros used for common Book-e exception handling + */ + +#define SET_IVOR(vector_number, vector_label) \ + li r26,vector_label@l; \ + mtspr SPRN_IVOR##vector_number,r26; \ + sync + +#if (THREAD_SHIFT < 15) +#define ALLOC_STACK_FRAME(reg, val) \ + addi reg,reg,val +#else +#define ALLOC_STACK_FRAME(reg, val) \ + addis reg,reg,val@ha; \ + addi reg,reg,val@l +#endif + +/* + * Macro used to get to thread save registers. + * Note that entries 0-3 are used for the prolog code, and the remaining + * entries are available for specific exception use in the event a handler + * requires more than 4 scratch registers. + */ +#define THREAD_NORMSAVE(offset) (THREAD_NORMSAVES + (offset * 4)) + +#ifdef CONFIG_PPC_E500 +#define BOOKE_CLEAR_BTB(reg) \ +START_BTB_FLUSH_SECTION \ + BTB_FLUSH(reg) \ +END_BTB_FLUSH_SECTION +#else +#define BOOKE_CLEAR_BTB(reg) +#endif + + +#define NORMAL_EXCEPTION_PROLOG(trapno, intno) \ + mtspr SPRN_SPRG_WSCRATCH0, r10; /* save one register */ \ + mfspr r10, SPRN_SPRG_THREAD; \ + stw r11, THREAD_NORMSAVE(0)(r10); \ + stw r13, THREAD_NORMSAVE(2)(r10); \ + mfcr r13; /* save CR in r13 for now */\ + mfspr r11, SPRN_SRR1; \ + DO_KVM BOOKE_INTERRUPT_##intno SPRN_SRR1; \ + andi. r11, r11, MSR_PR; /* check whether user or kernel */\ + LOAD_REG_IMMEDIATE(r11, MSR_KERNEL); \ + mtmsr r11; \ + mr r11, r1; \ + beq 1f; \ + BOOKE_CLEAR_BTB(r11) \ + /* if from user, start at top of this thread's kernel stack */ \ + lwz r11, TASK_STACK - THREAD(r10); \ + ALLOC_STACK_FRAME(r11, THREAD_SIZE); \ +1 : subi r11, r11, INT_FRAME_SIZE; /* Allocate exception frame */ \ + stw r13, _CCR(r11); /* save various registers */ \ + stw r12,GPR12(r11); \ + stw r9,GPR9(r11); \ + mfspr r13, SPRN_SPRG_RSCRATCH0; \ + stw r13, GPR10(r11); \ + lwz r12, THREAD_NORMSAVE(0)(r10); \ + stw r12,GPR11(r11); \ + lwz r13, THREAD_NORMSAVE(2)(r10); /* restore r13 */ \ + mflr r10; \ + stw r10,_LINK(r11); \ + mfspr r12,SPRN_SRR0; \ + stw r1, GPR1(r11); \ + mfspr r9,SPRN_SRR1; \ + stw r1, 0(r11); \ + mr r1, r11; \ + rlwinm r9,r9,0,14,12; /* clear MSR_WE (necessary?) */\ + COMMON_EXCEPTION_PROLOG_END trapno + +.macro COMMON_EXCEPTION_PROLOG_END trapno + stw r0,GPR0(r1) + lis r10, STACK_FRAME_REGS_MARKER@ha /* exception frame marker */ + addi r10, r10, STACK_FRAME_REGS_MARKER@l + stw r10, 8(r1) + li r10, \trapno + stw r10,_TRAP(r1) + SAVE_GPRS(3, 8, r1) + SAVE_NVGPRS(r1) + stw r2,GPR2(r1) + stw r12,_NIP(r1) + stw r9,_MSR(r1) + mfctr r10 + mfspr r2,SPRN_SPRG_THREAD + stw r10,_CTR(r1) + tovirt(r2, r2) + mfspr r10,SPRN_XER + addi r2, r2, -THREAD + stw r10,_XER(r1) + addi r3,r1,STACK_FRAME_OVERHEAD +.endm + +.macro prepare_transfer_to_handler +#ifdef CONFIG_PPC_E500 + andi. r12,r9,MSR_PR + bne 777f + bl prepare_transfer_to_handler +777: +#endif +.endm + +.macro SYSCALL_ENTRY trapno intno srr1 + mfspr r10, SPRN_SPRG_THREAD +#ifdef CONFIG_KVM_BOOKE_HV +BEGIN_FTR_SECTION + mtspr SPRN_SPRG_WSCRATCH0, r10 + stw r11, THREAD_NORMSAVE(0)(r10) + stw r13, THREAD_NORMSAVE(2)(r10) + mfcr r13 /* save CR in r13 for now */ + mfspr r11, SPRN_SRR1 + mtocrf 0x80, r11 /* check MSR[GS] without clobbering reg */ + bf 3, 1975f + b kvmppc_handler_\intno\()_\srr1 +1975: + mr r12, r13 + lwz r13, THREAD_NORMSAVE(2)(r10) +FTR_SECTION_ELSE + mfcr r12 +ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV) +#else + mfcr r12 +#endif + mfspr r9, SPRN_SRR1 + BOOKE_CLEAR_BTB(r11) + mr r11, r1 + lwz r1, TASK_STACK - THREAD(r10) + rlwinm r12,r12,0,4,2 /* Clear SO bit in CR */ + ALLOC_STACK_FRAME(r1, THREAD_SIZE - INT_FRAME_SIZE) + stw r12, _CCR(r1) + mfspr r12,SPRN_SRR0 + stw r12,_NIP(r1) + b transfer_to_syscall /* jump to handler */ +.endm + +/* To handle the additional exception priority levels on 40x and Book-E + * processors we allocate a stack per additional priority level. + * + * On 40x critical is the only additional level + * On 44x/e500 we have critical and machine check + * + * Additionally we reserve a SPRG for each priority level so we can free up a + * GPR to use as the base for indirect access to the exception stacks. This + * is necessary since the MMU is always on, for Book-E parts, and the stacks + * are offset from KERNELBASE. + * + * There is some space optimization to be had here if desired. However + * to allow for a common kernel with support for debug exceptions either + * going to critical or their own debug level we aren't currently + * providing configurations that micro-optimize space usage. + */ + +#define MC_STACK_BASE mcheckirq_ctx +#define CRIT_STACK_BASE critirq_ctx + +/* only on e500mc */ +#define DBG_STACK_BASE dbgirq_ctx + +#ifdef CONFIG_SMP +#define BOOKE_LOAD_EXC_LEVEL_STACK(level) \ + mfspr r8,SPRN_PIR; \ + slwi r8,r8,2; \ + addis r8,r8,level##_STACK_BASE@ha; \ + lwz r8,level##_STACK_BASE@l(r8); \ + addi r8,r8,THREAD_SIZE - INT_FRAME_SIZE; +#else +#define BOOKE_LOAD_EXC_LEVEL_STACK(level) \ + lis r8,level##_STACK_BASE@ha; \ + lwz r8,level##_STACK_BASE@l(r8); \ + addi r8,r8,THREAD_SIZE - INT_FRAME_SIZE; +#endif + +/* + * Exception prolog for critical/machine check exceptions. This is a + * little different from the normal exception prolog above since a + * critical/machine check exception can potentially occur at any point + * during normal exception processing. Thus we cannot use the same SPRG + * registers as the normal prolog above. Instead we use a portion of the + * critical/machine check exception stack at low physical addresses. + */ +#define EXC_LEVEL_EXCEPTION_PROLOG(exc_level, trapno, intno, exc_level_srr0, exc_level_srr1) \ + mtspr SPRN_SPRG_WSCRATCH_##exc_level,r8; \ + BOOKE_LOAD_EXC_LEVEL_STACK(exc_level);/* r8 points to the exc_level stack*/ \ + stw r9,GPR9(r8); /* save various registers */\ + mfcr r9; /* save CR in r9 for now */\ + stw r10,GPR10(r8); \ + stw r11,GPR11(r8); \ + stw r9,_CCR(r8); /* save CR on stack */\ + mfspr r11,exc_level_srr1; /* check whether user or kernel */\ + DO_KVM BOOKE_INTERRUPT_##intno exc_level_srr1; \ + BOOKE_CLEAR_BTB(r10) \ + andi. r11,r11,MSR_PR; \ + LOAD_REG_IMMEDIATE(r11, MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)); \ + mtmsr r11; \ + mfspr r11,SPRN_SPRG_THREAD; /* if from user, start at top of */\ + lwz r11, TASK_STACK - THREAD(r11); /* this thread's kernel stack */\ + addi r11,r11,THREAD_SIZE - INT_FRAME_SIZE; /* allocate stack frame */\ + beq 1f; \ + /* COMING FROM USER MODE */ \ + stw r9,_CCR(r11); /* save CR */\ + lwz r10,GPR10(r8); /* copy regs from exception stack */\ + lwz r9,GPR9(r8); \ + stw r10,GPR10(r11); \ + lwz r10,GPR11(r8); \ + stw r9,GPR9(r11); \ + stw r10,GPR11(r11); \ + b 2f; \ + /* COMING FROM PRIV MODE */ \ +1: mr r11, r8; \ +2: mfspr r8,SPRN_SPRG_RSCRATCH_##exc_level; \ + stw r12,GPR12(r11); /* save various registers */\ + mflr r10; \ + stw r10,_LINK(r11); \ + mfspr r12,SPRN_DEAR; /* save DEAR and ESR in the frame */\ + stw r12,_DEAR(r11); /* since they may have had stuff */\ + mfspr r9,SPRN_ESR; /* in them at the point where the */\ + stw r9,_ESR(r11); /* exception was taken */\ + mfspr r12,exc_level_srr0; \ + stw r1,GPR1(r11); \ + mfspr r9,exc_level_srr1; \ + stw r1,0(r11); \ + mr r1,r11; \ + rlwinm r9,r9,0,14,12; /* clear MSR_WE (necessary?) */\ + COMMON_EXCEPTION_PROLOG_END trapno + +#define SAVE_xSRR(xSRR) \ + mfspr r0,SPRN_##xSRR##0; \ + stw r0,_##xSRR##0(r1); \ + mfspr r0,SPRN_##xSRR##1; \ + stw r0,_##xSRR##1(r1) + + +.macro SAVE_MMU_REGS +#ifdef CONFIG_PPC_E500 + mfspr r0,SPRN_MAS0 + stw r0,MAS0(r1) + mfspr r0,SPRN_MAS1 + stw r0,MAS1(r1) + mfspr r0,SPRN_MAS2 + stw r0,MAS2(r1) + mfspr r0,SPRN_MAS3 + stw r0,MAS3(r1) + mfspr r0,SPRN_MAS6 + stw r0,MAS6(r1) +#ifdef CONFIG_PHYS_64BIT + mfspr r0,SPRN_MAS7 + stw r0,MAS7(r1) +#endif /* CONFIG_PHYS_64BIT */ +#endif /* CONFIG_PPC_E500 */ +#ifdef CONFIG_44x + mfspr r0,SPRN_MMUCR + stw r0,MMUCR(r1) +#endif +.endm + +#define CRITICAL_EXCEPTION_PROLOG(trapno, intno) \ + EXC_LEVEL_EXCEPTION_PROLOG(CRIT, trapno+2, intno, SPRN_CSRR0, SPRN_CSRR1) +#define DEBUG_EXCEPTION_PROLOG(trapno) \ + EXC_LEVEL_EXCEPTION_PROLOG(DBG, trapno+8, DEBUG, SPRN_DSRR0, SPRN_DSRR1) +#define MCHECK_EXCEPTION_PROLOG(trapno) \ + EXC_LEVEL_EXCEPTION_PROLOG(MC, trapno+4, MACHINE_CHECK, \ + SPRN_MCSRR0, SPRN_MCSRR1) + +/* + * Guest Doorbell -- this is a bit odd in that uses GSRR0/1 despite + * being delivered to the host. This exception can only happen + * inside a KVM guest -- so we just handle up to the DO_KVM rather + * than try to fit this into one of the existing prolog macros. + */ +#define GUEST_DOORBELL_EXCEPTION \ + START_EXCEPTION(GuestDoorbell); \ + mtspr SPRN_SPRG_WSCRATCH0, r10; /* save one register */ \ + mfspr r10, SPRN_SPRG_THREAD; \ + stw r11, THREAD_NORMSAVE(0)(r10); \ + mfspr r11, SPRN_SRR1; \ + stw r13, THREAD_NORMSAVE(2)(r10); \ + mfcr r13; /* save CR in r13 for now */\ + DO_KVM BOOKE_INTERRUPT_GUEST_DBELL SPRN_GSRR1; \ + trap + +/* + * Exception vectors. + */ +#define START_EXCEPTION(label) \ + .align 5; \ +label: + +#define EXCEPTION(n, intno, label, hdlr) \ + START_EXCEPTION(label); \ + NORMAL_EXCEPTION_PROLOG(n, intno); \ + prepare_transfer_to_handler; \ + bl hdlr; \ + b interrupt_return + +#define CRITICAL_EXCEPTION(n, intno, label, hdlr) \ + START_EXCEPTION(label); \ + CRITICAL_EXCEPTION_PROLOG(n, intno); \ + SAVE_MMU_REGS; \ + SAVE_xSRR(SRR); \ + prepare_transfer_to_handler; \ + bl hdlr; \ + b ret_from_crit_exc + +#define MCHECK_EXCEPTION(n, label, hdlr) \ + START_EXCEPTION(label); \ + MCHECK_EXCEPTION_PROLOG(n); \ + mfspr r5,SPRN_ESR; \ + stw r5,_ESR(r11); \ + SAVE_xSRR(DSRR); \ + SAVE_xSRR(CSRR); \ + SAVE_MMU_REGS; \ + SAVE_xSRR(SRR); \ + prepare_transfer_to_handler; \ + bl hdlr; \ + b ret_from_mcheck_exc + +/* Check for a single step debug exception while in an exception + * handler before state has been saved. This is to catch the case + * where an instruction that we are trying to single step causes + * an exception (eg ITLB/DTLB miss) and thus the first instruction of + * the exception handler generates a single step debug exception. + * + * If we get a debug trap on the first instruction of an exception handler, + * we reset the MSR_DE in the _exception handler's_ MSR (the debug trap is + * a critical exception, so we are using SPRN_CSRR1 to manipulate the MSR). + * The exception handler was handling a non-critical interrupt, so it will + * save (and later restore) the MSR via SPRN_CSRR1, which will still have + * the MSR_DE bit set. + */ +#define DEBUG_DEBUG_EXCEPTION \ + START_EXCEPTION(DebugDebug); \ + DEBUG_EXCEPTION_PROLOG(2000); \ + \ + /* \ + * If there is a single step or branch-taken exception in an \ + * exception entry sequence, it was probably meant to apply to \ + * the code where the exception occurred (since exception entry \ + * doesn't turn off DE automatically). We simulate the effect \ + * of turning off DE on entry to an exception handler by turning \ + * off DE in the DSRR1 value and clearing the debug status. \ + */ \ + mfspr r10,SPRN_DBSR; /* check single-step/branch taken */ \ + andis. r10,r10,(DBSR_IC|DBSR_BT)@h; \ + beq+ 2f; \ + \ + lis r10,interrupt_base@h; /* check if exception in vectors */ \ + ori r10,r10,interrupt_base@l; \ + cmplw r12,r10; \ + blt+ 2f; /* addr below exception vectors */ \ + \ + lis r10,interrupt_end@h; \ + ori r10,r10,interrupt_end@l; \ + cmplw r12,r10; \ + bgt+ 2f; /* addr above exception vectors */ \ + \ + /* here it looks like we got an inappropriate debug exception. */ \ +1: rlwinm r9,r9,0,~MSR_DE; /* clear DE in the CDRR1 value */ \ + lis r10,(DBSR_IC|DBSR_BT)@h; /* clear the IC event */ \ + mtspr SPRN_DBSR,r10; \ + /* restore state and get out */ \ + lwz r10,_CCR(r11); \ + lwz r0,GPR0(r11); \ + lwz r1,GPR1(r11); \ + mtcrf 0x80,r10; \ + mtspr SPRN_DSRR0,r12; \ + mtspr SPRN_DSRR1,r9; \ + lwz r9,GPR9(r11); \ + lwz r12,GPR12(r11); \ + mtspr SPRN_SPRG_WSCRATCH_DBG,r8; \ + BOOKE_LOAD_EXC_LEVEL_STACK(DBG); /* r8 points to the debug stack */ \ + lwz r10,GPR10(r8); \ + lwz r11,GPR11(r8); \ + mfspr r8,SPRN_SPRG_RSCRATCH_DBG; \ + \ + PPC_RFDI; \ + b .; \ + \ + /* continue normal handling for a debug exception... */ \ +2: mfspr r4,SPRN_DBSR; \ + stw r4,_ESR(r11); /* DebugException takes DBSR in _ESR */\ + SAVE_xSRR(CSRR); \ + SAVE_MMU_REGS; \ + SAVE_xSRR(SRR); \ + prepare_transfer_to_handler; \ + bl DebugException; \ + b ret_from_debug_exc + +#define DEBUG_CRIT_EXCEPTION \ + START_EXCEPTION(DebugCrit); \ + CRITICAL_EXCEPTION_PROLOG(2000,DEBUG); \ + \ + /* \ + * If there is a single step or branch-taken exception in an \ + * exception entry sequence, it was probably meant to apply to \ + * the code where the exception occurred (since exception entry \ + * doesn't turn off DE automatically). We simulate the effect \ + * of turning off DE on entry to an exception handler by turning \ + * off DE in the CSRR1 value and clearing the debug status. \ + */ \ + mfspr r10,SPRN_DBSR; /* check single-step/branch taken */ \ + andis. r10,r10,(DBSR_IC|DBSR_BT)@h; \ + beq+ 2f; \ + \ + lis r10,interrupt_base@h; /* check if exception in vectors */ \ + ori r10,r10,interrupt_base@l; \ + cmplw r12,r10; \ + blt+ 2f; /* addr below exception vectors */ \ + \ + lis r10,interrupt_end@h; \ + ori r10,r10,interrupt_end@l; \ + cmplw r12,r10; \ + bgt+ 2f; /* addr above exception vectors */ \ + \ + /* here it looks like we got an inappropriate debug exception. */ \ +1: rlwinm r9,r9,0,~MSR_DE; /* clear DE in the CSRR1 value */ \ + lis r10,(DBSR_IC|DBSR_BT)@h; /* clear the IC event */ \ + mtspr SPRN_DBSR,r10; \ + /* restore state and get out */ \ + lwz r10,_CCR(r11); \ + lwz r0,GPR0(r11); \ + lwz r1,GPR1(r11); \ + mtcrf 0x80,r10; \ + mtspr SPRN_CSRR0,r12; \ + mtspr SPRN_CSRR1,r9; \ + lwz r9,GPR9(r11); \ + lwz r12,GPR12(r11); \ + mtspr SPRN_SPRG_WSCRATCH_CRIT,r8; \ + BOOKE_LOAD_EXC_LEVEL_STACK(CRIT); /* r8 points to the debug stack */ \ + lwz r10,GPR10(r8); \ + lwz r11,GPR11(r8); \ + mfspr r8,SPRN_SPRG_RSCRATCH_CRIT; \ + \ + rfci; \ + b .; \ + \ + /* continue normal handling for a critical exception... */ \ +2: mfspr r4,SPRN_DBSR; \ + stw r4,_ESR(r11); /* DebugException takes DBSR in _ESR */\ + SAVE_MMU_REGS; \ + SAVE_xSRR(SRR); \ + prepare_transfer_to_handler; \ + bl DebugException; \ + b ret_from_crit_exc + +#define DATA_STORAGE_EXCEPTION \ + START_EXCEPTION(DataStorage) \ + NORMAL_EXCEPTION_PROLOG(0x300, DATA_STORAGE); \ + mfspr r5,SPRN_ESR; /* Grab the ESR and save it */ \ + stw r5,_ESR(r11); \ + mfspr r4,SPRN_DEAR; /* Grab the DEAR */ \ + stw r4, _DEAR(r11); \ + prepare_transfer_to_handler; \ + bl do_page_fault; \ + b interrupt_return + +/* + * Instruction TLB Error interrupt handlers may call InstructionStorage + * directly without clearing ESR, so the ESR at this point may be left over + * from a prior interrupt. + * + * In any case, do_page_fault for BOOK3E does not use ESR and always expects + * dsisr to be 0. ESR_DST from a prior store in particular would confuse fault + * handling. + */ +#define INSTRUCTION_STORAGE_EXCEPTION \ + START_EXCEPTION(InstructionStorage) \ + NORMAL_EXCEPTION_PROLOG(0x400, INST_STORAGE); \ + li r5,0; /* Store 0 in regs->esr (dsisr) */ \ + stw r5,_ESR(r11); \ + stw r12, _DEAR(r11); /* Set regs->dear (dar) to SRR0 */ \ + prepare_transfer_to_handler; \ + bl do_page_fault; \ + b interrupt_return + +#define ALIGNMENT_EXCEPTION \ + START_EXCEPTION(Alignment) \ + NORMAL_EXCEPTION_PROLOG(0x600, ALIGNMENT); \ + mfspr r4,SPRN_DEAR; /* Grab the DEAR and save it */ \ + stw r4,_DEAR(r11); \ + prepare_transfer_to_handler; \ + bl alignment_exception; \ + REST_NVGPRS(r1); \ + b interrupt_return + +#define PROGRAM_EXCEPTION \ + START_EXCEPTION(Program) \ + NORMAL_EXCEPTION_PROLOG(0x700, PROGRAM); \ + mfspr r4,SPRN_ESR; /* Grab the ESR and save it */ \ + stw r4,_ESR(r11); \ + prepare_transfer_to_handler; \ + bl program_check_exception; \ + REST_NVGPRS(r1); \ + b interrupt_return + +#define DECREMENTER_EXCEPTION \ + START_EXCEPTION(Decrementer) \ + NORMAL_EXCEPTION_PROLOG(0x900, DECREMENTER); \ + lis r0,TSR_DIS@h; /* Setup the DEC interrupt mask */ \ + mtspr SPRN_TSR,r0; /* Clear the DEC interrupt */ \ + prepare_transfer_to_handler; \ + bl timer_interrupt; \ + b interrupt_return + +#define FP_UNAVAILABLE_EXCEPTION \ + START_EXCEPTION(FloatingPointUnavailable) \ + NORMAL_EXCEPTION_PROLOG(0x800, FP_UNAVAIL); \ + beq 1f; \ + bl load_up_fpu; /* if from user, just load it up */ \ + b fast_exception_return; \ +1: prepare_transfer_to_handler; \ + bl kernel_fp_unavailable_exception; \ + b interrupt_return + +#endif /* __ASSEMBLY__ */ +#endif /* __HEAD_BOOKE_H__ */ diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c new file mode 100644 index 000000000..02436f80e --- /dev/null +++ b/arch/powerpc/kernel/hw_breakpoint.c @@ -0,0 +1,884 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * HW_breakpoint: a unified kernel/user-space hardware breakpoint facility, + * using the CPU's debug registers. Derived from + * "arch/x86/kernel/hw_breakpoint.c" + * + * Copyright 2010 IBM Corporation + * Author: K.Prasad <prasad@linux.vnet.ibm.com> + */ + +#include <linux/hw_breakpoint.h> +#include <linux/notifier.h> +#include <linux/kprobes.h> +#include <linux/percpu.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/smp.h> +#include <linux/spinlock.h> +#include <linux/debugfs.h> +#include <linux/init.h> + +#include <asm/hw_breakpoint.h> +#include <asm/processor.h> +#include <asm/sstep.h> +#include <asm/debug.h> +#include <asm/hvcall.h> +#include <asm/inst.h> +#include <linux/uaccess.h> + +/* + * Stores the breakpoints currently in use on each breakpoint address + * register for every cpu + */ +static DEFINE_PER_CPU(struct perf_event *, bp_per_reg[HBP_NUM_MAX]); + +/* + * Returns total number of data or instruction breakpoints available. + */ +int hw_breakpoint_slots(int type) +{ + if (type == TYPE_DATA) + return nr_wp_slots(); + return 0; /* no instruction breakpoints available */ +} + +static bool single_step_pending(void) +{ + int i; + + for (i = 0; i < nr_wp_slots(); i++) { + if (current->thread.last_hit_ubp[i]) + return true; + } + return false; +} + +/* + * Install a perf counter breakpoint. + * + * We seek a free debug address register and use it for this + * breakpoint. + * + * Atomic: we hold the counter->ctx->lock and we only handle variables + * and registers local to this cpu. + */ +int arch_install_hw_breakpoint(struct perf_event *bp) +{ + struct arch_hw_breakpoint *info = counter_arch_bp(bp); + struct perf_event **slot; + int i; + + for (i = 0; i < nr_wp_slots(); i++) { + slot = this_cpu_ptr(&bp_per_reg[i]); + if (!*slot) { + *slot = bp; + break; + } + } + + if (WARN_ONCE(i == nr_wp_slots(), "Can't find any breakpoint slot")) + return -EBUSY; + + /* + * Do not install DABR values if the instruction must be single-stepped. + * If so, DABR will be populated in single_step_dabr_instruction(). + */ + if (!single_step_pending()) + __set_breakpoint(i, info); + + return 0; +} + +/* + * Uninstall the breakpoint contained in the given counter. + * + * First we search the debug address register it uses and then we disable + * it. + * + * Atomic: we hold the counter->ctx->lock and we only handle variables + * and registers local to this cpu. + */ +void arch_uninstall_hw_breakpoint(struct perf_event *bp) +{ + struct arch_hw_breakpoint null_brk = {0}; + struct perf_event **slot; + int i; + + for (i = 0; i < nr_wp_slots(); i++) { + slot = this_cpu_ptr(&bp_per_reg[i]); + if (*slot == bp) { + *slot = NULL; + break; + } + } + + if (WARN_ONCE(i == nr_wp_slots(), "Can't find any breakpoint slot")) + return; + + __set_breakpoint(i, &null_brk); +} + +static bool is_ptrace_bp(struct perf_event *bp) +{ + return bp->overflow_handler == ptrace_triggered; +} + +struct breakpoint { + struct list_head list; + struct perf_event *bp; + bool ptrace_bp; +}; + +/* + * While kernel/events/hw_breakpoint.c does its own synchronization, we cannot + * rely on it safely synchronizing internals here; however, we can rely on it + * not requesting more breakpoints than available. + */ +static DEFINE_SPINLOCK(cpu_bps_lock); +static DEFINE_PER_CPU(struct breakpoint *, cpu_bps[HBP_NUM_MAX]); +static DEFINE_SPINLOCK(task_bps_lock); +static LIST_HEAD(task_bps); + +static struct breakpoint *alloc_breakpoint(struct perf_event *bp) +{ + struct breakpoint *tmp; + + tmp = kzalloc(sizeof(*tmp), GFP_KERNEL); + if (!tmp) + return ERR_PTR(-ENOMEM); + tmp->bp = bp; + tmp->ptrace_bp = is_ptrace_bp(bp); + return tmp; +} + +static bool bp_addr_range_overlap(struct perf_event *bp1, struct perf_event *bp2) +{ + __u64 bp1_saddr, bp1_eaddr, bp2_saddr, bp2_eaddr; + + bp1_saddr = ALIGN_DOWN(bp1->attr.bp_addr, HW_BREAKPOINT_SIZE); + bp1_eaddr = ALIGN(bp1->attr.bp_addr + bp1->attr.bp_len, HW_BREAKPOINT_SIZE); + bp2_saddr = ALIGN_DOWN(bp2->attr.bp_addr, HW_BREAKPOINT_SIZE); + bp2_eaddr = ALIGN(bp2->attr.bp_addr + bp2->attr.bp_len, HW_BREAKPOINT_SIZE); + + return (bp1_saddr < bp2_eaddr && bp1_eaddr > bp2_saddr); +} + +static bool alternate_infra_bp(struct breakpoint *b, struct perf_event *bp) +{ + return is_ptrace_bp(bp) ? !b->ptrace_bp : b->ptrace_bp; +} + +static bool can_co_exist(struct breakpoint *b, struct perf_event *bp) +{ + return !(alternate_infra_bp(b, bp) && bp_addr_range_overlap(b->bp, bp)); +} + +static int task_bps_add(struct perf_event *bp) +{ + struct breakpoint *tmp; + + tmp = alloc_breakpoint(bp); + if (IS_ERR(tmp)) + return PTR_ERR(tmp); + + spin_lock(&task_bps_lock); + list_add(&tmp->list, &task_bps); + spin_unlock(&task_bps_lock); + return 0; +} + +static void task_bps_remove(struct perf_event *bp) +{ + struct list_head *pos, *q; + + spin_lock(&task_bps_lock); + list_for_each_safe(pos, q, &task_bps) { + struct breakpoint *tmp = list_entry(pos, struct breakpoint, list); + + if (tmp->bp == bp) { + list_del(&tmp->list); + kfree(tmp); + break; + } + } + spin_unlock(&task_bps_lock); +} + +/* + * If any task has breakpoint from alternate infrastructure, + * return true. Otherwise return false. + */ +static bool all_task_bps_check(struct perf_event *bp) +{ + struct breakpoint *tmp; + bool ret = false; + + spin_lock(&task_bps_lock); + list_for_each_entry(tmp, &task_bps, list) { + if (!can_co_exist(tmp, bp)) { + ret = true; + break; + } + } + spin_unlock(&task_bps_lock); + return ret; +} + +/* + * If same task has breakpoint from alternate infrastructure, + * return true. Otherwise return false. + */ +static bool same_task_bps_check(struct perf_event *bp) +{ + struct breakpoint *tmp; + bool ret = false; + + spin_lock(&task_bps_lock); + list_for_each_entry(tmp, &task_bps, list) { + if (tmp->bp->hw.target == bp->hw.target && + !can_co_exist(tmp, bp)) { + ret = true; + break; + } + } + spin_unlock(&task_bps_lock); + return ret; +} + +static int cpu_bps_add(struct perf_event *bp) +{ + struct breakpoint **cpu_bp; + struct breakpoint *tmp; + int i = 0; + + tmp = alloc_breakpoint(bp); + if (IS_ERR(tmp)) + return PTR_ERR(tmp); + + spin_lock(&cpu_bps_lock); + cpu_bp = per_cpu_ptr(cpu_bps, bp->cpu); + for (i = 0; i < nr_wp_slots(); i++) { + if (!cpu_bp[i]) { + cpu_bp[i] = tmp; + break; + } + } + spin_unlock(&cpu_bps_lock); + return 0; +} + +static void cpu_bps_remove(struct perf_event *bp) +{ + struct breakpoint **cpu_bp; + int i = 0; + + spin_lock(&cpu_bps_lock); + cpu_bp = per_cpu_ptr(cpu_bps, bp->cpu); + for (i = 0; i < nr_wp_slots(); i++) { + if (!cpu_bp[i]) + continue; + + if (cpu_bp[i]->bp == bp) { + kfree(cpu_bp[i]); + cpu_bp[i] = NULL; + break; + } + } + spin_unlock(&cpu_bps_lock); +} + +static bool cpu_bps_check(int cpu, struct perf_event *bp) +{ + struct breakpoint **cpu_bp; + bool ret = false; + int i; + + spin_lock(&cpu_bps_lock); + cpu_bp = per_cpu_ptr(cpu_bps, cpu); + for (i = 0; i < nr_wp_slots(); i++) { + if (cpu_bp[i] && !can_co_exist(cpu_bp[i], bp)) { + ret = true; + break; + } + } + spin_unlock(&cpu_bps_lock); + return ret; +} + +static bool all_cpu_bps_check(struct perf_event *bp) +{ + int cpu; + + for_each_online_cpu(cpu) { + if (cpu_bps_check(cpu, bp)) + return true; + } + return false; +} + +int arch_reserve_bp_slot(struct perf_event *bp) +{ + int ret; + + /* ptrace breakpoint */ + if (is_ptrace_bp(bp)) { + if (all_cpu_bps_check(bp)) + return -ENOSPC; + + if (same_task_bps_check(bp)) + return -ENOSPC; + + return task_bps_add(bp); + } + + /* perf breakpoint */ + if (is_kernel_addr(bp->attr.bp_addr)) + return 0; + + if (bp->hw.target && bp->cpu == -1) { + if (same_task_bps_check(bp)) + return -ENOSPC; + + return task_bps_add(bp); + } else if (!bp->hw.target && bp->cpu != -1) { + if (all_task_bps_check(bp)) + return -ENOSPC; + + return cpu_bps_add(bp); + } + + if (same_task_bps_check(bp)) + return -ENOSPC; + + ret = cpu_bps_add(bp); + if (ret) + return ret; + ret = task_bps_add(bp); + if (ret) + cpu_bps_remove(bp); + + return ret; +} + +void arch_release_bp_slot(struct perf_event *bp) +{ + if (!is_kernel_addr(bp->attr.bp_addr)) { + if (bp->hw.target) + task_bps_remove(bp); + if (bp->cpu != -1) + cpu_bps_remove(bp); + } +} + +/* + * Perform cleanup of arch-specific counters during unregistration + * of the perf-event + */ +void arch_unregister_hw_breakpoint(struct perf_event *bp) +{ + /* + * If the breakpoint is unregistered between a hw_breakpoint_handler() + * and the single_step_dabr_instruction(), then cleanup the breakpoint + * restoration variables to prevent dangling pointers. + * FIXME, this should not be using bp->ctx at all! Sayeth peterz. + */ + if (bp->ctx && bp->ctx->task && bp->ctx->task != ((void *)-1L)) { + int i; + + for (i = 0; i < nr_wp_slots(); i++) { + if (bp->ctx->task->thread.last_hit_ubp[i] == bp) + bp->ctx->task->thread.last_hit_ubp[i] = NULL; + } + } +} + +/* + * Check for virtual address in kernel space. + */ +int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw) +{ + return is_kernel_addr(hw->address); +} + +int arch_bp_generic_fields(int type, int *gen_bp_type) +{ + *gen_bp_type = 0; + if (type & HW_BRK_TYPE_READ) + *gen_bp_type |= HW_BREAKPOINT_R; + if (type & HW_BRK_TYPE_WRITE) + *gen_bp_type |= HW_BREAKPOINT_W; + if (*gen_bp_type == 0) + return -EINVAL; + return 0; +} + +/* + * Watchpoint match range is always doubleword(8 bytes) aligned on + * powerpc. If the given range is crossing doubleword boundary, we + * need to increase the length such that next doubleword also get + * covered. Ex, + * + * address len = 6 bytes + * |=========. + * |------------v--|------v--------| + * | | | | | | | | | | | | | | | | | + * |---------------|---------------| + * <---8 bytes---> + * + * In this case, we should configure hw as: + * start_addr = address & ~(HW_BREAKPOINT_SIZE - 1) + * len = 16 bytes + * + * @start_addr is inclusive but @end_addr is exclusive. + */ +static int hw_breakpoint_validate_len(struct arch_hw_breakpoint *hw) +{ + u16 max_len = DABR_MAX_LEN; + u16 hw_len; + unsigned long start_addr, end_addr; + + start_addr = ALIGN_DOWN(hw->address, HW_BREAKPOINT_SIZE); + end_addr = ALIGN(hw->address + hw->len, HW_BREAKPOINT_SIZE); + hw_len = end_addr - start_addr; + + if (dawr_enabled()) { + max_len = DAWR_MAX_LEN; + /* DAWR region can't cross 512 bytes boundary on p10 predecessors */ + if (!cpu_has_feature(CPU_FTR_ARCH_31) && + (ALIGN_DOWN(start_addr, SZ_512) != ALIGN_DOWN(end_addr - 1, SZ_512))) + return -EINVAL; + } else if (IS_ENABLED(CONFIG_PPC_8xx)) { + /* 8xx can setup a range without limitation */ + max_len = U16_MAX; + } + + if (hw_len > max_len) + return -EINVAL; + + hw->hw_len = hw_len; + return 0; +} + +/* + * Validate the arch-specific HW Breakpoint register settings + */ +int hw_breakpoint_arch_parse(struct perf_event *bp, + const struct perf_event_attr *attr, + struct arch_hw_breakpoint *hw) +{ + int ret = -EINVAL; + + if (!bp || !attr->bp_len) + return ret; + + hw->type = HW_BRK_TYPE_TRANSLATE; + if (attr->bp_type & HW_BREAKPOINT_R) + hw->type |= HW_BRK_TYPE_READ; + if (attr->bp_type & HW_BREAKPOINT_W) + hw->type |= HW_BRK_TYPE_WRITE; + if (hw->type == HW_BRK_TYPE_TRANSLATE) + /* must set alteast read or write */ + return ret; + if (!attr->exclude_user) + hw->type |= HW_BRK_TYPE_USER; + if (!attr->exclude_kernel) + hw->type |= HW_BRK_TYPE_KERNEL; + if (!attr->exclude_hv) + hw->type |= HW_BRK_TYPE_HYP; + hw->address = attr->bp_addr; + hw->len = attr->bp_len; + + if (!ppc_breakpoint_available()) + return -ENODEV; + + return hw_breakpoint_validate_len(hw); +} + +/* + * Restores the breakpoint on the debug registers. + * Invoke this function if it is known that the execution context is + * about to change to cause loss of MSR_SE settings. + */ +void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs) +{ + struct arch_hw_breakpoint *info; + int i; + + preempt_disable(); + + for (i = 0; i < nr_wp_slots(); i++) { + if (unlikely(tsk->thread.last_hit_ubp[i])) + goto reset; + } + goto out; + +reset: + regs_set_return_msr(regs, regs->msr & ~MSR_SE); + for (i = 0; i < nr_wp_slots(); i++) { + info = counter_arch_bp(__this_cpu_read(bp_per_reg[i])); + __set_breakpoint(i, info); + tsk->thread.last_hit_ubp[i] = NULL; + } + +out: + preempt_enable(); +} + +static bool is_larx_stcx_instr(int type) +{ + return type == LARX || type == STCX; +} + +static bool is_octword_vsx_instr(int type, int size) +{ + return ((type == LOAD_VSX || type == STORE_VSX) && size == 32); +} + +/* + * We've failed in reliably handling the hw-breakpoint. Unregister + * it and throw a warning message to let the user know about it. + */ +static void handler_error(struct perf_event *bp, struct arch_hw_breakpoint *info) +{ + WARN(1, "Unable to handle hardware breakpoint. Breakpoint at 0x%lx will be disabled.", + info->address); + perf_event_disable_inatomic(bp); +} + +static void larx_stcx_err(struct perf_event *bp, struct arch_hw_breakpoint *info) +{ + printk_ratelimited("Breakpoint hit on instruction that can't be emulated. Breakpoint at 0x%lx will be disabled.\n", + info->address); + perf_event_disable_inatomic(bp); +} + +static bool stepping_handler(struct pt_regs *regs, struct perf_event **bp, + struct arch_hw_breakpoint **info, int *hit, + ppc_inst_t instr) +{ + int i; + int stepped; + + /* Do not emulate user-space instructions, instead single-step them */ + if (user_mode(regs)) { + for (i = 0; i < nr_wp_slots(); i++) { + if (!hit[i]) + continue; + current->thread.last_hit_ubp[i] = bp[i]; + info[i] = NULL; + } + regs_set_return_msr(regs, regs->msr | MSR_SE); + return false; + } + + stepped = emulate_step(regs, instr); + if (!stepped) { + for (i = 0; i < nr_wp_slots(); i++) { + if (!hit[i]) + continue; + handler_error(bp[i], info[i]); + info[i] = NULL; + } + return false; + } + return true; +} + +static void handle_p10dd1_spurious_exception(struct arch_hw_breakpoint **info, + int *hit, unsigned long ea) +{ + int i; + unsigned long hw_end_addr; + + /* + * Handle spurious exception only when any bp_per_reg is set. + * Otherwise this might be created by xmon and not actually a + * spurious exception. + */ + for (i = 0; i < nr_wp_slots(); i++) { + if (!info[i]) + continue; + + hw_end_addr = ALIGN(info[i]->address + info[i]->len, HW_BREAKPOINT_SIZE); + + /* + * Ending address of DAWR range is less than starting + * address of op. + */ + if ((hw_end_addr - 1) >= ea) + continue; + + /* + * Those addresses need to be in the same or in two + * consecutive 512B blocks; + */ + if (((hw_end_addr - 1) >> 10) != (ea >> 10)) + continue; + + /* + * 'op address + 64B' generates an address that has a + * carry into bit 52 (crosses 2K boundary). + */ + if ((ea & 0x800) == ((ea + 64) & 0x800)) + continue; + + break; + } + + if (i == nr_wp_slots()) + return; + + for (i = 0; i < nr_wp_slots(); i++) { + if (info[i]) { + hit[i] = 1; + info[i]->type |= HW_BRK_TYPE_EXTRANEOUS_IRQ; + } + } +} + +/* + * Handle a DABR or DAWR exception. + * + * Called in atomic context. + */ +int hw_breakpoint_handler(struct die_args *args) +{ + bool err = false; + int rc = NOTIFY_STOP; + struct perf_event *bp[HBP_NUM_MAX] = { NULL }; + struct pt_regs *regs = args->regs; + struct arch_hw_breakpoint *info[HBP_NUM_MAX] = { NULL }; + int i; + int hit[HBP_NUM_MAX] = {0}; + int nr_hit = 0; + bool ptrace_bp = false; + ppc_inst_t instr = ppc_inst(0); + int type = 0; + int size = 0; + unsigned long ea; + + /* Disable breakpoints during exception handling */ + hw_breakpoint_disable(); + + /* + * The counter may be concurrently released but that can only + * occur from a call_rcu() path. We can then safely fetch + * the breakpoint, use its callback, touch its counter + * while we are in an rcu_read_lock() path. + */ + rcu_read_lock(); + + if (!IS_ENABLED(CONFIG_PPC_8xx)) + wp_get_instr_detail(regs, &instr, &type, &size, &ea); + + for (i = 0; i < nr_wp_slots(); i++) { + bp[i] = __this_cpu_read(bp_per_reg[i]); + if (!bp[i]) + continue; + + info[i] = counter_arch_bp(bp[i]); + info[i]->type &= ~HW_BRK_TYPE_EXTRANEOUS_IRQ; + + if (wp_check_constraints(regs, instr, ea, type, size, info[i])) { + if (!IS_ENABLED(CONFIG_PPC_8xx) && + ppc_inst_equal(instr, ppc_inst(0))) { + handler_error(bp[i], info[i]); + info[i] = NULL; + err = 1; + continue; + } + + if (is_ptrace_bp(bp[i])) + ptrace_bp = true; + hit[i] = 1; + nr_hit++; + } + } + + if (err) + goto reset; + + if (!nr_hit) { + /* Workaround for Power10 DD1 */ + if (!IS_ENABLED(CONFIG_PPC_8xx) && mfspr(SPRN_PVR) == 0x800100 && + is_octword_vsx_instr(type, size)) { + handle_p10dd1_spurious_exception(info, hit, ea); + } else { + rc = NOTIFY_DONE; + goto out; + } + } + + /* + * Return early after invoking user-callback function without restoring + * DABR if the breakpoint is from ptrace which always operates in + * one-shot mode. The ptrace-ed process will receive the SIGTRAP signal + * generated in do_dabr(). + */ + if (ptrace_bp) { + for (i = 0; i < nr_wp_slots(); i++) { + if (!hit[i]) + continue; + perf_bp_event(bp[i], regs); + info[i] = NULL; + } + rc = NOTIFY_DONE; + goto reset; + } + + if (!IS_ENABLED(CONFIG_PPC_8xx)) { + if (is_larx_stcx_instr(type)) { + for (i = 0; i < nr_wp_slots(); i++) { + if (!hit[i]) + continue; + larx_stcx_err(bp[i], info[i]); + info[i] = NULL; + } + goto reset; + } + + if (!stepping_handler(regs, bp, info, hit, instr)) + goto reset; + } + + /* + * As a policy, the callback is invoked in a 'trigger-after-execute' + * fashion + */ + for (i = 0; i < nr_wp_slots(); i++) { + if (!hit[i]) + continue; + if (!(info[i]->type & HW_BRK_TYPE_EXTRANEOUS_IRQ)) + perf_bp_event(bp[i], regs); + } + +reset: + for (i = 0; i < nr_wp_slots(); i++) { + if (!info[i]) + continue; + __set_breakpoint(i, info[i]); + } + +out: + rcu_read_unlock(); + return rc; +} +NOKPROBE_SYMBOL(hw_breakpoint_handler); + +/* + * Handle single-step exceptions following a DABR hit. + * + * Called in atomic context. + */ +static int single_step_dabr_instruction(struct die_args *args) +{ + struct pt_regs *regs = args->regs; + struct perf_event *bp = NULL; + struct arch_hw_breakpoint *info; + int i; + bool found = false; + + /* + * Check if we are single-stepping as a result of a + * previous HW Breakpoint exception + */ + for (i = 0; i < nr_wp_slots(); i++) { + bp = current->thread.last_hit_ubp[i]; + + if (!bp) + continue; + + found = true; + info = counter_arch_bp(bp); + + /* + * We shall invoke the user-defined callback function in the + * single stepping handler to confirm to 'trigger-after-execute' + * semantics + */ + if (!(info->type & HW_BRK_TYPE_EXTRANEOUS_IRQ)) + perf_bp_event(bp, regs); + current->thread.last_hit_ubp[i] = NULL; + } + + if (!found) + return NOTIFY_DONE; + + for (i = 0; i < nr_wp_slots(); i++) { + bp = __this_cpu_read(bp_per_reg[i]); + if (!bp) + continue; + + info = counter_arch_bp(bp); + __set_breakpoint(i, info); + } + + /* + * If the process was being single-stepped by ptrace, let the + * other single-step actions occur (e.g. generate SIGTRAP). + */ + if (test_thread_flag(TIF_SINGLESTEP)) + return NOTIFY_DONE; + + return NOTIFY_STOP; +} +NOKPROBE_SYMBOL(single_step_dabr_instruction); + +/* + * Handle debug exception notifications. + * + * Called in atomic context. + */ +int hw_breakpoint_exceptions_notify( + struct notifier_block *unused, unsigned long val, void *data) +{ + int ret = NOTIFY_DONE; + + switch (val) { + case DIE_DABR_MATCH: + ret = hw_breakpoint_handler(data); + break; + case DIE_SSTEP: + ret = single_step_dabr_instruction(data); + break; + } + + return ret; +} +NOKPROBE_SYMBOL(hw_breakpoint_exceptions_notify); + +/* + * Release the user breakpoints used by ptrace + */ +void flush_ptrace_hw_breakpoint(struct task_struct *tsk) +{ + int i; + struct thread_struct *t = &tsk->thread; + + for (i = 0; i < nr_wp_slots(); i++) { + unregister_hw_breakpoint(t->ptrace_bps[i]); + t->ptrace_bps[i] = NULL; + } +} + +void hw_breakpoint_pmu_read(struct perf_event *bp) +{ + /* TODO */ +} + +void ptrace_triggered(struct perf_event *bp, + struct perf_sample_data *data, struct pt_regs *regs) +{ + struct perf_event_attr attr; + + /* + * Disable the breakpoint request here since ptrace has defined a + * one-shot behaviour for breakpoint exceptions in PPC64. + * The SIGTRAP signal is generated automatically for us in do_dabr(). + * We don't have to do anything about that here + */ + attr = bp->attr; + attr.disabled = true; + modify_user_hw_breakpoint(bp, &attr); +} diff --git a/arch/powerpc/kernel/hw_breakpoint_constraints.c b/arch/powerpc/kernel/hw_breakpoint_constraints.c new file mode 100644 index 000000000..9e51801c4 --- /dev/null +++ b/arch/powerpc/kernel/hw_breakpoint_constraints.c @@ -0,0 +1,158 @@ +// SPDX-License-Identifier: GPL-2.0+ +#include <linux/kernel.h> +#include <linux/uaccess.h> +#include <linux/sched.h> +#include <asm/hw_breakpoint.h> +#include <asm/sstep.h> +#include <asm/cache.h> + +static bool dar_in_user_range(unsigned long dar, struct arch_hw_breakpoint *info) +{ + return ((info->address <= dar) && (dar - info->address < info->len)); +} + +static bool ea_user_range_overlaps(unsigned long ea, int size, + struct arch_hw_breakpoint *info) +{ + return ((ea < info->address + info->len) && + (ea + size > info->address)); +} + +static bool dar_in_hw_range(unsigned long dar, struct arch_hw_breakpoint *info) +{ + unsigned long hw_start_addr, hw_end_addr; + + hw_start_addr = ALIGN_DOWN(info->address, HW_BREAKPOINT_SIZE); + hw_end_addr = ALIGN(info->address + info->len, HW_BREAKPOINT_SIZE); + + return ((hw_start_addr <= dar) && (hw_end_addr > dar)); +} + +static bool ea_hw_range_overlaps(unsigned long ea, int size, + struct arch_hw_breakpoint *info) +{ + unsigned long hw_start_addr, hw_end_addr; + unsigned long align_size = HW_BREAKPOINT_SIZE; + + /* + * On p10 predecessors, quadword is handle differently then + * other instructions. + */ + if (!cpu_has_feature(CPU_FTR_ARCH_31) && size == 16) + align_size = HW_BREAKPOINT_SIZE_QUADWORD; + + hw_start_addr = ALIGN_DOWN(info->address, align_size); + hw_end_addr = ALIGN(info->address + info->len, align_size); + + return ((ea < hw_end_addr) && (ea + size > hw_start_addr)); +} + +/* + * If hw has multiple DAWR registers, we also need to check all + * dawrx constraint bits to confirm this is _really_ a valid event. + * If type is UNKNOWN, but privilege level matches, consider it as + * a positive match. + */ +static bool check_dawrx_constraints(struct pt_regs *regs, int type, + struct arch_hw_breakpoint *info) +{ + if (OP_IS_LOAD(type) && !(info->type & HW_BRK_TYPE_READ)) + return false; + + /* + * The Cache Management instructions other than dcbz never + * cause a match. i.e. if type is CACHEOP, the instruction + * is dcbz, and dcbz is treated as Store. + */ + if ((OP_IS_STORE(type) || type == CACHEOP) && !(info->type & HW_BRK_TYPE_WRITE)) + return false; + + if (is_kernel_addr(regs->nip) && !(info->type & HW_BRK_TYPE_KERNEL)) + return false; + + if (user_mode(regs) && !(info->type & HW_BRK_TYPE_USER)) + return false; + + return true; +} + +/* + * Return true if the event is valid wrt dawr configuration, + * including extraneous exception. Otherwise return false. + */ +bool wp_check_constraints(struct pt_regs *regs, ppc_inst_t instr, + unsigned long ea, int type, int size, + struct arch_hw_breakpoint *info) +{ + bool in_user_range = dar_in_user_range(regs->dar, info); + bool dawrx_constraints; + + /* + * 8xx supports only one breakpoint and thus we can + * unconditionally return true. + */ + if (IS_ENABLED(CONFIG_PPC_8xx)) { + if (!in_user_range) + info->type |= HW_BRK_TYPE_EXTRANEOUS_IRQ; + return true; + } + + if (unlikely(ppc_inst_equal(instr, ppc_inst(0)))) { + if (cpu_has_feature(CPU_FTR_ARCH_31) && + !dar_in_hw_range(regs->dar, info)) + return false; + + return true; + } + + dawrx_constraints = check_dawrx_constraints(regs, type, info); + + if (type == UNKNOWN) { + if (cpu_has_feature(CPU_FTR_ARCH_31) && + !dar_in_hw_range(regs->dar, info)) + return false; + + return dawrx_constraints; + } + + if (ea_user_range_overlaps(ea, size, info)) + return dawrx_constraints; + + if (ea_hw_range_overlaps(ea, size, info)) { + if (dawrx_constraints) { + info->type |= HW_BRK_TYPE_EXTRANEOUS_IRQ; + return true; + } + } + return false; +} + +void wp_get_instr_detail(struct pt_regs *regs, ppc_inst_t *instr, + int *type, int *size, unsigned long *ea) +{ + struct instruction_op op; + int err; + + pagefault_disable(); + err = __get_user_instr(*instr, (void __user *)regs->nip); + pagefault_enable(); + + if (err) + return; + + analyse_instr(&op, regs, *instr); + *type = GETTYPE(op.type); + *ea = op.ea; + + if (!(regs->msr & MSR_64BIT)) + *ea &= 0xffffffffUL; + + + *size = GETSIZE(op.type); + if (*type == CACHEOP) { + *size = l1_dcache_bytes(); + *ea &= ~(*size - 1); + } else if (*type == LOAD_VMX || *type == STORE_VMX) { + *ea &= ~(*size - 1); + } +} diff --git a/arch/powerpc/kernel/idle.c b/arch/powerpc/kernel/idle.c new file mode 100644 index 000000000..77cd4c5a2 --- /dev/null +++ b/arch/powerpc/kernel/idle.c @@ -0,0 +1,128 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Idle daemon for PowerPC. Idle daemon will handle any action + * that needs to be taken when the system becomes idle. + * + * Originally written by Cort Dougan (cort@cs.nmt.edu). + * Subsequent 32-bit hacking by Tom Rini, Armin Kuster, + * Paul Mackerras and others. + * + * iSeries supported added by Mike Corrigan <mikejc@us.ibm.com> + * + * Additional shared processor, SMT, and firmware support + * Copyright (c) 2003 Dave Engebretsen <engebret@us.ibm.com> + * + * 32-bit and 64-bit versions merged by Paul Mackerras <paulus@samba.org> + */ + +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/smp.h> +#include <linux/cpu.h> +#include <linux/sysctl.h> +#include <linux/tick.h> + +#include <asm/processor.h> +#include <asm/cputable.h> +#include <asm/time.h> +#include <asm/machdep.h> +#include <asm/runlatch.h> +#include <asm/smp.h> + + +unsigned long cpuidle_disable = IDLE_NO_OVERRIDE; +EXPORT_SYMBOL(cpuidle_disable); + +static int __init powersave_off(char *arg) +{ + ppc_md.power_save = NULL; + cpuidle_disable = IDLE_POWERSAVE_OFF; + return 1; +} +__setup("powersave=off", powersave_off); + +void arch_cpu_idle(void) +{ + ppc64_runlatch_off(); + + if (ppc_md.power_save) { + ppc_md.power_save(); + /* + * Some power_save functions return with + * interrupts enabled, some don't. + */ + if (irqs_disabled()) + raw_local_irq_enable(); + } else { + raw_local_irq_enable(); + /* + * Go into low thread priority and possibly + * low power mode. + */ + HMT_low(); + HMT_very_low(); + } + + HMT_medium(); + ppc64_runlatch_on(); +} + +int powersave_nap; + +#ifdef CONFIG_PPC_970_NAP +void power4_idle(void) +{ + if (!cpu_has_feature(CPU_FTR_CAN_NAP)) + return; + + if (!powersave_nap) + return; + + if (!prep_irq_for_idle()) + return; + + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + asm volatile(PPC_DSSALL " ; sync" ::: "memory"); + + power4_idle_nap(); + + /* + * power4_idle_nap returns with interrupts enabled (soft and hard). + * to our caller with interrupts enabled (soft and hard). Our caller + * can cope with either interrupts disabled or enabled upon return. + */ +} +#endif + +#ifdef CONFIG_SYSCTL +/* + * Register the sysctl to set/clear powersave_nap. + */ +static struct ctl_table powersave_nap_ctl_table[] = { + { + .procname = "powersave-nap", + .data = &powersave_nap, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + {} +}; +static struct ctl_table powersave_nap_sysctl_root[] = { + { + .procname = "kernel", + .mode = 0555, + .child = powersave_nap_ctl_table, + }, + {} +}; + +static int __init +register_powersave_nap_sysctl(void) +{ + register_sysctl_table(powersave_nap_sysctl_root); + + return 0; +} +__initcall(register_powersave_nap_sysctl); +#endif diff --git a/arch/powerpc/kernel/idle_64e.S b/arch/powerpc/kernel/idle_64e.S new file mode 100644 index 000000000..0fc680e03 --- /dev/null +++ b/arch/powerpc/kernel/idle_64e.S @@ -0,0 +1,99 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright 2010 IBM Corp, Benjamin Herrenschmidt <benh@kernel.crashing.org> + * + * Generic idle routine for 64 bits e500 processors + */ + +#include <linux/threads.h> +#include <asm/reg.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/ppc-opcode.h> +#include <asm/processor.h> +#include <asm/thread_info.h> +#include <asm/epapr_hcalls.h> +#include <asm/hw_irq.h> + +/* 64-bit version only for now */ +.macro BOOK3E_IDLE name loop +_GLOBAL(\name) + /* Save LR for later */ + mflr r0 + std r0,16(r1) + + /* Hard disable interrupts */ + wrteei 0 + + /* Now check if an interrupt came in while we were soft disabled + * since we may otherwise lose it (doorbells etc...). + */ + lbz r3,PACAIRQHAPPENED(r13) + cmpwi cr0,r3,0 + bne 2f + + /* Now we are going to mark ourselves as soft and hard enabled in + * order to be able to take interrupts while asleep. We inform lockdep + * of that. We don't actually turn interrupts on just yet tho. + */ +#ifdef CONFIG_TRACE_IRQFLAGS + stdu r1,-128(r1) + bl trace_hardirqs_on + addi r1,r1,128 +#endif + li r0,IRQS_ENABLED + stb r0,PACAIRQSOFTMASK(r13) + + /* Interrupts will make use return to LR, so get something we want + * in there + */ + bl 1f + + /* And return (interrupts are on) */ + ld r0,16(r1) + mtlr r0 + blr + +1: /* Let's set the _TLF_NAPPING flag so interrupts make us return + * to the right spot + */ + ld r11, PACACURRENT(r13) + ld r10,TI_LOCAL_FLAGS(r11) + ori r10,r10,_TLF_NAPPING + std r10,TI_LOCAL_FLAGS(r11) + + /* We can now re-enable hard interrupts and go to sleep */ + wrteei 1 + \loop + +2: + lbz r10,PACAIRQHAPPENED(r13) + ori r10,r10,PACA_IRQ_HARD_DIS + stb r10,PACAIRQHAPPENED(r13) + blr +.endm + +.macro BOOK3E_IDLE_LOOP +1: + PPC_WAIT_v203 + b 1b +.endm + +/* epapr_ev_idle_start below is patched with the proper hcall + opcodes during kernel initialization */ +.macro EPAPR_EV_IDLE_LOOP +idle_loop: + LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE)) + +.global epapr_ev_idle_start +epapr_ev_idle_start: + li r3, -1 + nop + nop + nop + b idle_loop +.endm + +BOOK3E_IDLE epapr_ev_idle EPAPR_EV_IDLE_LOOP + +BOOK3E_IDLE e500_idle BOOK3E_IDLE_LOOP diff --git a/arch/powerpc/kernel/idle_6xx.S b/arch/powerpc/kernel/idle_6xx.S new file mode 100644 index 000000000..3c0973563 --- /dev/null +++ b/arch/powerpc/kernel/idle_6xx.S @@ -0,0 +1,191 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * This file contains the power_save function for 6xx & 7xxx CPUs + * rewritten in assembler + * + * Warning ! This code assumes that if your machine has a 750fx + * it will have PLL 1 set to low speed mode (used during NAP/DOZE). + * if this is not the case some additional changes will have to + * be done to check a runtime var (a bit like powersave-nap) + */ + +#include <linux/threads.h> +#include <asm/reg.h> +#include <asm/page.h> +#include <asm/cputable.h> +#include <asm/thread_info.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/feature-fixups.h> + + .text + +/* + * Init idle, called at early CPU setup time from head.S for each CPU + * Make sure no rest of NAP mode remains in HID0, save default + * values for some CPU specific registers. Called with r24 + * containing CPU number and r3 reloc offset + */ +_GLOBAL(init_idle_6xx) +BEGIN_FTR_SECTION + mfspr r4,SPRN_HID0 + rlwinm r4,r4,0,10,8 /* Clear NAP */ + mtspr SPRN_HID0, r4 + b 1f +END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP) + blr +1: + slwi r5,r24,2 + add r5,r5,r3 +BEGIN_FTR_SECTION + mfspr r4,SPRN_MSSCR0 + addis r6,r5, nap_save_msscr0@ha + stw r4,nap_save_msscr0@l(r6) +END_FTR_SECTION_IFSET(CPU_FTR_NAP_DISABLE_L2_PR) +BEGIN_FTR_SECTION + mfspr r4,SPRN_HID1 + addis r6,r5,nap_save_hid1@ha + stw r4,nap_save_hid1@l(r6) +END_FTR_SECTION_IFSET(CPU_FTR_DUAL_PLL_750FX) + blr + +/* + * Here is the power_save_6xx function. This could eventually be + * split into several functions & changing the function pointer + * depending on the various features. + */ +_GLOBAL(ppc6xx_idle) + /* Check if we can nap or doze, put HID0 mask in r3 + */ + lis r3, 0 +BEGIN_FTR_SECTION + lis r3,HID0_DOZE@h +END_FTR_SECTION_IFSET(CPU_FTR_CAN_DOZE) +BEGIN_FTR_SECTION + /* We must dynamically check for the NAP feature as it + * can be cleared by CPU init after the fixups are done + */ + lis r4,cur_cpu_spec@ha + lwz r4,cur_cpu_spec@l(r4) + lwz r4,CPU_SPEC_FEATURES(r4) + andi. r0,r4,CPU_FTR_CAN_NAP + beq 1f + /* Now check if user or arch enabled NAP mode */ + lis r4,powersave_nap@ha + lwz r4,powersave_nap@l(r4) + cmpwi 0,r4,0 + beq 1f + lis r3,HID0_NAP@h +1: +END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP) + cmpwi 0,r3,0 + beqlr + + /* Some pre-nap cleanups needed on some CPUs */ + andis. r0,r3,HID0_NAP@h + beq 2f +BEGIN_FTR_SECTION + /* Disable L2 prefetch on some 745x and try to ensure + * L2 prefetch engines are idle. As explained by errata + * text, we can't be sure they are, we just hope very hard + * that well be enough (sic !). At least I noticed Apple + * doesn't even bother doing the dcbf's here... + */ + mfspr r4,SPRN_MSSCR0 + rlwinm r4,r4,0,0,29 + sync + mtspr SPRN_MSSCR0,r4 + sync + isync + lis r4,KERNELBASE@h + dcbf 0,r4 + dcbf 0,r4 + dcbf 0,r4 + dcbf 0,r4 +END_FTR_SECTION_IFSET(CPU_FTR_NAP_DISABLE_L2_PR) +2: +BEGIN_FTR_SECTION + /* Go to low speed mode on some 750FX */ + lis r4,powersave_lowspeed@ha + lwz r4,powersave_lowspeed@l(r4) + cmpwi 0,r4,0 + beq 1f + mfspr r4,SPRN_HID1 + oris r4,r4,0x0001 + mtspr SPRN_HID1,r4 +1: +END_FTR_SECTION_IFSET(CPU_FTR_DUAL_PLL_750FX) + + /* Go to NAP or DOZE now */ + mfspr r4,SPRN_HID0 + lis r5,(HID0_NAP|HID0_SLEEP)@h +BEGIN_FTR_SECTION + oris r5,r5,HID0_DOZE@h +END_FTR_SECTION_IFSET(CPU_FTR_CAN_DOZE) + andc r4,r4,r5 + or r4,r4,r3 +BEGIN_FTR_SECTION + oris r4,r4,HID0_DPM@h /* that should be done once for all */ +END_FTR_SECTION_IFCLR(CPU_FTR_NO_DPM) + mtspr SPRN_HID0,r4 +BEGIN_FTR_SECTION + PPC_DSSALL + sync +END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) + lwz r8,TI_LOCAL_FLAGS(r2) /* set napping bit */ + ori r8,r8,_TLF_NAPPING /* so when we take an exception */ + stw r8,TI_LOCAL_FLAGS(r2) /* it will return to our caller */ + mfmsr r7 + ori r7,r7,MSR_EE + oris r7,r7,MSR_POW@h +1: sync + mtmsr r7 + isync + b 1b + +/* + * Return from NAP/DOZE mode, restore some CPU specific registers, + * R11 points to the exception frame. We have to preserve r10. + */ +_GLOBAL(power_save_ppc32_restore) + lwz r9,_LINK(r11) /* interrupted in ppc6xx_idle: */ + stw r9,_NIP(r11) /* make it do a blr */ + +#ifdef CONFIG_SMP + lwz r11,TASK_CPU(r2) /* get cpu number * 4 */ + slwi r11,r11,2 +#else + li r11,0 +#endif + /* Todo make sure all these are in the same page + * and load r11 (@ha part + CPU offset) only once + */ +BEGIN_FTR_SECTION + mfspr r9,SPRN_HID0 + andis. r9,r9,HID0_NAP@h + beq 1f + addis r9, r11, nap_save_msscr0@ha + lwz r9,nap_save_msscr0@l(r9) + mtspr SPRN_MSSCR0, r9 + sync + isync +1: +END_FTR_SECTION_IFSET(CPU_FTR_NAP_DISABLE_L2_PR) +BEGIN_FTR_SECTION + addis r9, r11, nap_save_hid1@ha + lwz r9,nap_save_hid1@l(r9) + mtspr SPRN_HID1, r9 +END_FTR_SECTION_IFSET(CPU_FTR_DUAL_PLL_750FX) + blr +_ASM_NOKPROBE_SYMBOL(power_save_ppc32_restore) + + .data + +_GLOBAL(nap_save_msscr0) + .space 4*NR_CPUS + +_GLOBAL(nap_save_hid1) + .space 4*NR_CPUS + +_GLOBAL(powersave_lowspeed) + .long 0 diff --git a/arch/powerpc/kernel/idle_85xx.S b/arch/powerpc/kernel/idle_85xx.S new file mode 100644 index 000000000..9e1bc4502 --- /dev/null +++ b/arch/powerpc/kernel/idle_85xx.S @@ -0,0 +1,85 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2008 Freescale Semiconductor, Inc. All rights reserved. + * Dave Liu <daveliu@freescale.com> + * copy from idle_6xx.S and modify for e500 based processor, + * implement the power_save function in idle. + */ + +#include <linux/threads.h> +#include <asm/reg.h> +#include <asm/page.h> +#include <asm/cputable.h> +#include <asm/thread_info.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/feature-fixups.h> + + .text + +_GLOBAL(e500_idle) + lwz r4,TI_LOCAL_FLAGS(r2) /* set napping bit */ + ori r4,r4,_TLF_NAPPING /* so when we take an exception */ + stw r4,TI_LOCAL_FLAGS(r2) /* it will return to our caller */ + +#ifdef CONFIG_PPC_E500MC + wrteei 1 +1: wait + + /* + * Guard against spurious wakeups (e.g. from a hypervisor) -- + * any real interrupt will cause us to return to LR due to + * _TLF_NAPPING. + */ + b 1b +#else + /* Check if we can nap or doze, put HID0 mask in r3 */ + lis r3,0 +BEGIN_FTR_SECTION + lis r3,HID0_DOZE@h +END_FTR_SECTION_IFSET(CPU_FTR_CAN_DOZE) + +BEGIN_FTR_SECTION + /* Now check if user enabled NAP mode */ + lis r4,powersave_nap@ha + lwz r4,powersave_nap@l(r4) + cmpwi 0,r4,0 + beq 1f + stwu r1,-16(r1) + mflr r0 + stw r0,20(r1) + bl flush_dcache_L1 + lwz r0,20(r1) + addi r1,r1,16 + mtlr r0 + lis r3,HID0_NAP@h +END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP) +1: + /* Go to NAP or DOZE now */ + mfspr r4,SPRN_HID0 + rlwinm r4,r4,0,~(HID0_DOZE|HID0_NAP|HID0_SLEEP) + or r4,r4,r3 + isync + mtspr SPRN_HID0,r4 + isync + + mfmsr r7 + oris r7,r7,MSR_WE@h + ori r7,r7,MSR_EE + msync + mtmsr r7 + isync +2: b 2b +#endif /* !E500MC */ + +/* + * Return from NAP/DOZE mode, restore some CPU specific registers, + * r2 containing address of current. + * r11 points to the exception frame. + * We have to preserve r10. + */ +_GLOBAL(power_save_ppc32_restore) + lwz r9,_LINK(r11) /* interrupted in e500_idle */ + stw r9,_NIP(r11) /* make it do a blr */ + blr +_ASM_NOKPROBE_SYMBOL(power_save_ppc32_restore) diff --git a/arch/powerpc/kernel/idle_book3s.S b/arch/powerpc/kernel/idle_book3s.S new file mode 100644 index 000000000..3d97fb833 --- /dev/null +++ b/arch/powerpc/kernel/idle_book3s.S @@ -0,0 +1,218 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright 2018, IBM Corporation. + * + * This file contains general idle entry/exit functions to save + * and restore stack and NVGPRs which allows C code to call idle + * states that lose GPRs, and it will return transparently with + * SRR1 wakeup reason return value. + * + * The platform / CPU caller must ensure SPRs and any other non-GPR + * state is saved and restored correctly, handle KVM, interrupts, etc. + */ + +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/ppc-opcode.h> +#include <asm/cpuidle.h> +#include <asm/thread_info.h> /* TLF_NAPPING */ + +#ifdef CONFIG_PPC_P7_NAP +/* + * Desired PSSCR in r3 + * + * No state will be lost regardless of wakeup mechanism (interrupt or NIA). + * + * An EC=0 type wakeup will return with a value of 0. SRESET wakeup (which can + * happen with xscom SRESET and possibly MCE) may clobber volatiles except LR, + * and must blr, to return to caller with r3 set according to caller's expected + * return code (for Book3S/64 that is SRR1). + */ +_GLOBAL(isa300_idle_stop_noloss) + mtspr SPRN_PSSCR,r3 + PPC_STOP + li r3,0 + blr + +/* + * Desired PSSCR in r3 + * + * GPRs may be lost, so they are saved here. Wakeup is by interrupt only. + * The SRESET wakeup returns to this function's caller by calling + * idle_return_gpr_loss with r3 set to desired return value. + * + * A wakeup without GPR loss may alteratively be handled as in + * isa300_idle_stop_noloss and blr directly, as an optimisation. + * + * The caller is responsible for saving/restoring SPRs, MSR, timebase, + * etc. + */ +_GLOBAL(isa300_idle_stop_mayloss) + mtspr SPRN_PSSCR,r3 + std r1,PACAR1(r13) + mflr r4 + mfcr r5 + /* + * Use the stack red zone rather than a new frame for saving regs since + * in the case of no GPR loss the wakeup code branches directly back to + * the caller without deallocating the stack frame first. + */ + std r2,-8*1(r1) + std r14,-8*2(r1) + std r15,-8*3(r1) + std r16,-8*4(r1) + std r17,-8*5(r1) + std r18,-8*6(r1) + std r19,-8*7(r1) + std r20,-8*8(r1) + std r21,-8*9(r1) + std r22,-8*10(r1) + std r23,-8*11(r1) + std r24,-8*12(r1) + std r25,-8*13(r1) + std r26,-8*14(r1) + std r27,-8*15(r1) + std r28,-8*16(r1) + std r29,-8*17(r1) + std r30,-8*18(r1) + std r31,-8*19(r1) + std r4,-8*20(r1) + std r5,-8*21(r1) + /* 168 bytes */ + PPC_STOP + b . /* catch bugs */ + +/* + * Desired return value in r3 + * + * The idle wakeup SRESET interrupt can call this after calling + * to return to the idle sleep function caller with r3 as the return code. + * + * This must not be used if idle was entered via a _noloss function (use + * a simple blr instead). + */ +_GLOBAL(idle_return_gpr_loss) + ld r1,PACAR1(r13) + ld r4,-8*20(r1) + ld r5,-8*21(r1) + mtlr r4 + mtcr r5 + /* + * KVM nap requires r2 to be saved, rather than just restoring it + * from PACATOC. This could be avoided for that less common case + * if KVM saved its r2. + */ + ld r2,-8*1(r1) + ld r14,-8*2(r1) + ld r15,-8*3(r1) + ld r16,-8*4(r1) + ld r17,-8*5(r1) + ld r18,-8*6(r1) + ld r19,-8*7(r1) + ld r20,-8*8(r1) + ld r21,-8*9(r1) + ld r22,-8*10(r1) + ld r23,-8*11(r1) + ld r24,-8*12(r1) + ld r25,-8*13(r1) + ld r26,-8*14(r1) + ld r27,-8*15(r1) + ld r28,-8*16(r1) + ld r29,-8*17(r1) + ld r30,-8*18(r1) + ld r31,-8*19(r1) + blr + +/* + * This is the sequence required to execute idle instructions, as + * specified in ISA v2.07 (and earlier). MSR[IR] and MSR[DR] must be 0. + * We have to store a GPR somewhere, ptesync, then reload it, and create + * a false dependency on the result of the load. It doesn't matter which + * GPR we store, or where we store it. We have already stored r2 to the + * stack at -8(r1) in isa206_idle_insn_mayloss, so use that. + */ +#define IDLE_STATE_ENTER_SEQ_NORET(IDLE_INST) \ + /* Magic NAP/SLEEP/WINKLE mode enter sequence */ \ + std r2,-8(r1); \ + ptesync; \ + ld r2,-8(r1); \ +236: cmpd cr0,r2,r2; \ + bne 236b; \ + IDLE_INST; \ + b . /* catch bugs */ + +/* + * Desired instruction type in r3 + * + * GPRs may be lost, so they are saved here. Wakeup is by interrupt only. + * The SRESET wakeup returns to this function's caller by calling + * idle_return_gpr_loss with r3 set to desired return value. + * + * A wakeup without GPR loss may alteratively be handled as in + * isa300_idle_stop_noloss and blr directly, as an optimisation. + * + * The caller is responsible for saving/restoring SPRs, MSR, timebase, + * etc. + * + * This must be called in real-mode (MSR_IDLE). + */ +_GLOBAL(isa206_idle_insn_mayloss) + std r1,PACAR1(r13) + mflr r4 + mfcr r5 + /* + * Use the stack red zone rather than a new frame for saving regs since + * in the case of no GPR loss the wakeup code branches directly back to + * the caller without deallocating the stack frame first. + */ + std r2,-8*1(r1) + std r14,-8*2(r1) + std r15,-8*3(r1) + std r16,-8*4(r1) + std r17,-8*5(r1) + std r18,-8*6(r1) + std r19,-8*7(r1) + std r20,-8*8(r1) + std r21,-8*9(r1) + std r22,-8*10(r1) + std r23,-8*11(r1) + std r24,-8*12(r1) + std r25,-8*13(r1) + std r26,-8*14(r1) + std r27,-8*15(r1) + std r28,-8*16(r1) + std r29,-8*17(r1) + std r30,-8*18(r1) + std r31,-8*19(r1) + std r4,-8*20(r1) + std r5,-8*21(r1) + cmpwi r3,PNV_THREAD_NAP + bne 1f + IDLE_STATE_ENTER_SEQ_NORET(PPC_NAP) +1: cmpwi r3,PNV_THREAD_SLEEP + bne 2f + IDLE_STATE_ENTER_SEQ_NORET(PPC_SLEEP) +2: IDLE_STATE_ENTER_SEQ_NORET(PPC_WINKLE) +#endif + +#ifdef CONFIG_PPC_970_NAP +_GLOBAL(power4_idle_nap) + LOAD_REG_IMMEDIATE(r7, MSR_KERNEL|MSR_EE|MSR_POW) + ld r9,PACA_THREAD_INFO(r13) + ld r8,TI_LOCAL_FLAGS(r9) + ori r8,r8,_TLF_NAPPING + std r8,TI_LOCAL_FLAGS(r9) + /* + * NAPPING bit is set, from this point onward power4_fixup_nap + * will cause exceptions to return to power4_idle_nap_return. + */ +1: sync + isync + mtmsrd r7 + isync + b 1b + + .globl power4_idle_nap_return +power4_idle_nap_return: + blr +#endif diff --git a/arch/powerpc/kernel/ima_arch.c b/arch/powerpc/kernel/ima_arch.c new file mode 100644 index 000000000..957abd592 --- /dev/null +++ b/arch/powerpc/kernel/ima_arch.c @@ -0,0 +1,78 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 IBM Corporation + * Author: Nayna Jain + */ + +#include <linux/ima.h> +#include <asm/secure_boot.h> + +bool arch_ima_get_secureboot(void) +{ + return is_ppc_secureboot_enabled(); +} + +/* + * The "secure_rules" are enabled only on "secureboot" enabled systems. + * These rules verify the file signatures against known good values. + * The "appraise_type=imasig|modsig" option allows the known good signature + * to be stored as an xattr or as an appended signature. + * + * To avoid duplicate signature verification as much as possible, the IMA + * policy rule for module appraisal is added only if CONFIG_MODULE_SIG + * is not enabled. + */ +static const char *const secure_rules[] = { + "appraise func=KEXEC_KERNEL_CHECK appraise_flag=check_blacklist appraise_type=imasig|modsig", +#ifndef CONFIG_MODULE_SIG + "appraise func=MODULE_CHECK appraise_flag=check_blacklist appraise_type=imasig|modsig", +#endif + NULL +}; + +/* + * The "trusted_rules" are enabled only on "trustedboot" enabled systems. + * These rules add the kexec kernel image and kernel modules file hashes to + * the IMA measurement list. + */ +static const char *const trusted_rules[] = { + "measure func=KEXEC_KERNEL_CHECK", + "measure func=MODULE_CHECK", + NULL +}; + +/* + * The "secure_and_trusted_rules" contains rules for both the secure boot and + * trusted boot. The "template=ima-modsig" option includes the appended + * signature, when available, in the IMA measurement list. + */ +static const char *const secure_and_trusted_rules[] = { + "measure func=KEXEC_KERNEL_CHECK template=ima-modsig", + "measure func=MODULE_CHECK template=ima-modsig", + "appraise func=KEXEC_KERNEL_CHECK appraise_flag=check_blacklist appraise_type=imasig|modsig", +#ifndef CONFIG_MODULE_SIG + "appraise func=MODULE_CHECK appraise_flag=check_blacklist appraise_type=imasig|modsig", +#endif + NULL +}; + +/* + * Returns the relevant IMA arch-specific policies based on the system secure + * boot state. + */ +const char *const *arch_get_ima_policy(void) +{ + if (is_ppc_secureboot_enabled()) { + if (IS_ENABLED(CONFIG_MODULE_SIG)) + set_module_sig_enforced(); + + if (is_ppc_trustedboot_enabled()) + return secure_and_trusted_rules; + else + return secure_rules; + } else if (is_ppc_trustedboot_enabled()) { + return trusted_rules; + } + + return NULL; +} diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c new file mode 100644 index 000000000..cf770d86c --- /dev/null +++ b/arch/powerpc/kernel/interrupt.c @@ -0,0 +1,506 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <linux/context_tracking.h> +#include <linux/err.h> +#include <linux/compat.h> +#include <linux/sched/debug.h> /* for show_regs */ + +#include <asm/kup.h> +#include <asm/cputime.h> +#include <asm/hw_irq.h> +#include <asm/interrupt.h> +#include <asm/kprobes.h> +#include <asm/paca.h> +#include <asm/ptrace.h> +#include <asm/reg.h> +#include <asm/signal.h> +#include <asm/switch_to.h> +#include <asm/syscall.h> +#include <asm/time.h> +#include <asm/tm.h> +#include <asm/unistd.h> + +#if defined(CONFIG_PPC_ADV_DEBUG_REGS) && defined(CONFIG_PPC32) +unsigned long global_dbcr0[NR_CPUS]; +#endif + +#ifdef CONFIG_PPC_BOOK3S_64 +DEFINE_STATIC_KEY_FALSE(interrupt_exit_not_reentrant); +static inline bool exit_must_hard_disable(void) +{ + return static_branch_unlikely(&interrupt_exit_not_reentrant); +} +#else +static inline bool exit_must_hard_disable(void) +{ + return true; +} +#endif + +/* + * local irqs must be disabled. Returns false if the caller must re-enable + * them, check for new work, and try again. + * + * This should be called with local irqs disabled, but if they were previously + * enabled when the interrupt handler returns (indicating a process-context / + * synchronous interrupt) then irqs_enabled should be true. + * + * restartable is true then EE/RI can be left on because interrupts are handled + * with a restart sequence. + */ +static notrace __always_inline bool prep_irq_for_enabled_exit(bool restartable) +{ + bool must_hard_disable = (exit_must_hard_disable() || !restartable); + + /* This must be done with RI=1 because tracing may touch vmaps */ + trace_hardirqs_on(); + + if (must_hard_disable) + __hard_EE_RI_disable(); + +#ifdef CONFIG_PPC64 + /* This pattern matches prep_irq_for_idle */ + if (unlikely(lazy_irq_pending_nocheck())) { + if (must_hard_disable) { + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + __hard_RI_enable(); + } + trace_hardirqs_off(); + + return false; + } +#endif + return true; +} + +static notrace void booke_load_dbcr0(void) +{ +#ifdef CONFIG_PPC_ADV_DEBUG_REGS + unsigned long dbcr0 = current->thread.debug.dbcr0; + + if (likely(!(dbcr0 & DBCR0_IDM))) + return; + + /* + * Check to see if the dbcr0 register is set up to debug. + * Use the internal debug mode bit to do this. + */ + mtmsr(mfmsr() & ~MSR_DE); + if (IS_ENABLED(CONFIG_PPC32)) { + isync(); + global_dbcr0[smp_processor_id()] = mfspr(SPRN_DBCR0); + } + mtspr(SPRN_DBCR0, dbcr0); + mtspr(SPRN_DBSR, -1); +#endif +} + +static void check_return_regs_valid(struct pt_regs *regs) +{ +#ifdef CONFIG_PPC_BOOK3S_64 + unsigned long trap, srr0, srr1; + static bool warned; + u8 *validp; + char *h; + + if (trap_is_scv(regs)) + return; + + trap = TRAP(regs); + // EE in HV mode sets HSRRs like 0xea0 + if (cpu_has_feature(CPU_FTR_HVMODE) && trap == INTERRUPT_EXTERNAL) + trap = 0xea0; + + switch (trap) { + case 0x980: + case INTERRUPT_H_DATA_STORAGE: + case 0xe20: + case 0xe40: + case INTERRUPT_HMI: + case 0xe80: + case 0xea0: + case INTERRUPT_H_FAC_UNAVAIL: + case 0x1200: + case 0x1500: + case 0x1600: + case 0x1800: + validp = &local_paca->hsrr_valid; + if (!*validp) + return; + + srr0 = mfspr(SPRN_HSRR0); + srr1 = mfspr(SPRN_HSRR1); + h = "H"; + + break; + default: + validp = &local_paca->srr_valid; + if (!*validp) + return; + + srr0 = mfspr(SPRN_SRR0); + srr1 = mfspr(SPRN_SRR1); + h = ""; + break; + } + + if (srr0 == regs->nip && srr1 == regs->msr) + return; + + /* + * A NMI / soft-NMI interrupt may have come in after we found + * srr_valid and before the SRRs are loaded. The interrupt then + * comes in and clobbers SRRs and clears srr_valid. Then we load + * the SRRs here and test them above and find they don't match. + * + * Test validity again after that, to catch such false positives. + * + * This test in general will have some window for false negatives + * and may not catch and fix all such cases if an NMI comes in + * later and clobbers SRRs without clearing srr_valid, but hopefully + * such things will get caught most of the time, statistically + * enough to be able to get a warning out. + */ + barrier(); + + if (!*validp) + return; + + if (!warned) { + warned = true; + printk("%sSRR0 was: %lx should be: %lx\n", h, srr0, regs->nip); + printk("%sSRR1 was: %lx should be: %lx\n", h, srr1, regs->msr); + show_regs(regs); + } + + *validp = 0; /* fixup */ +#endif +} + +static notrace unsigned long +interrupt_exit_user_prepare_main(unsigned long ret, struct pt_regs *regs) +{ + unsigned long ti_flags; + +again: + ti_flags = read_thread_flags(); + while (unlikely(ti_flags & (_TIF_USER_WORK_MASK & ~_TIF_RESTORE_TM))) { + local_irq_enable(); + if (ti_flags & _TIF_NEED_RESCHED) { + schedule(); + } else { + /* + * SIGPENDING must restore signal handler function + * argument GPRs, and some non-volatiles (e.g., r1). + * Restore all for now. This could be made lighter. + */ + if (ti_flags & _TIF_SIGPENDING) + ret |= _TIF_RESTOREALL; + do_notify_resume(regs, ti_flags); + } + local_irq_disable(); + ti_flags = read_thread_flags(); + } + + if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && IS_ENABLED(CONFIG_PPC_FPU)) { + if (IS_ENABLED(CONFIG_PPC_TRANSACTIONAL_MEM) && + unlikely((ti_flags & _TIF_RESTORE_TM))) { + restore_tm_state(regs); + } else { + unsigned long mathflags = MSR_FP; + + if (cpu_has_feature(CPU_FTR_VSX)) + mathflags |= MSR_VEC | MSR_VSX; + else if (cpu_has_feature(CPU_FTR_ALTIVEC)) + mathflags |= MSR_VEC; + + /* + * If userspace MSR has all available FP bits set, + * then they are live and no need to restore. If not, + * it means the regs were given up and restore_math + * may decide to restore them (to avoid taking an FP + * fault). + */ + if ((regs->msr & mathflags) != mathflags) + restore_math(regs); + } + } + + check_return_regs_valid(regs); + + user_enter_irqoff(); + if (!prep_irq_for_enabled_exit(true)) { + user_exit_irqoff(); + local_irq_enable(); + local_irq_disable(); + goto again; + } + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + local_paca->tm_scratch = regs->msr; +#endif + + booke_load_dbcr0(); + + account_cpu_user_exit(); + + /* Restore user access locks last */ + kuap_user_restore(regs); + + return ret; +} + +/* + * This should be called after a syscall returns, with r3 the return value + * from the syscall. If this function returns non-zero, the system call + * exit assembly should additionally load all GPR registers and CTR and XER + * from the interrupt frame. + * + * The function graph tracer can not trace the return side of this function, + * because RI=0 and soft mask state is "unreconciled", so it is marked notrace. + */ +notrace unsigned long syscall_exit_prepare(unsigned long r3, + struct pt_regs *regs, + long scv) +{ + unsigned long ti_flags; + unsigned long ret = 0; + bool is_not_scv = !IS_ENABLED(CONFIG_PPC_BOOK3S_64) || !scv; + + CT_WARN_ON(ct_state() == CONTEXT_USER); + + kuap_assert_locked(); + + regs->result = r3; + + /* Check whether the syscall is issued inside a restartable sequence */ + rseq_syscall(regs); + + ti_flags = read_thread_flags(); + + if (unlikely(r3 >= (unsigned long)-MAX_ERRNO) && is_not_scv) { + if (likely(!(ti_flags & (_TIF_NOERROR | _TIF_RESTOREALL)))) { + r3 = -r3; + regs->ccr |= 0x10000000; /* Set SO bit in CR */ + } + } + + if (unlikely(ti_flags & _TIF_PERSYSCALL_MASK)) { + if (ti_flags & _TIF_RESTOREALL) + ret = _TIF_RESTOREALL; + else + regs->gpr[3] = r3; + clear_bits(_TIF_PERSYSCALL_MASK, ¤t_thread_info()->flags); + } else { + regs->gpr[3] = r3; + } + + if (unlikely(ti_flags & _TIF_SYSCALL_DOTRACE)) { + do_syscall_trace_leave(regs); + ret |= _TIF_RESTOREALL; + } + + local_irq_disable(); + ret = interrupt_exit_user_prepare_main(ret, regs); + +#ifdef CONFIG_PPC64 + regs->exit_result = ret; +#endif + + return ret; +} + +#ifdef CONFIG_PPC64 +notrace unsigned long syscall_exit_restart(unsigned long r3, struct pt_regs *regs) +{ + /* + * This is called when detecting a soft-pending interrupt as well as + * an alternate-return interrupt. So we can't just have the alternate + * return path clear SRR1[MSR] and set PACA_IRQ_HARD_DIS (unless + * the soft-pending case were to fix things up as well). RI might be + * disabled, in which case it gets re-enabled by __hard_irq_disable(). + */ + __hard_irq_disable(); + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + +#ifdef CONFIG_PPC_BOOK3S_64 + set_kuap(AMR_KUAP_BLOCKED); +#endif + + trace_hardirqs_off(); + user_exit_irqoff(); + account_cpu_user_entry(); + + BUG_ON(!user_mode(regs)); + + regs->exit_result = interrupt_exit_user_prepare_main(regs->exit_result, regs); + + return regs->exit_result; +} +#endif + +notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs) +{ + unsigned long ret; + + BUG_ON(regs_is_unrecoverable(regs)); + BUG_ON(arch_irq_disabled_regs(regs)); + CT_WARN_ON(ct_state() == CONTEXT_USER); + + /* + * We don't need to restore AMR on the way back to userspace for KUAP. + * AMR can only have been unlocked if we interrupted the kernel. + */ + kuap_assert_locked(); + + local_irq_disable(); + + ret = interrupt_exit_user_prepare_main(0, regs); + +#ifdef CONFIG_PPC64 + regs->exit_result = ret; +#endif + + return ret; +} + +void preempt_schedule_irq(void); + +notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs) +{ + unsigned long ret = 0; + unsigned long kuap; + bool stack_store = read_thread_flags() & _TIF_EMULATE_STACK_STORE; + + if (regs_is_unrecoverable(regs)) + unrecoverable_exception(regs); + /* + * CT_WARN_ON comes here via program_check_exception, so avoid + * recursion. + * + * Skip the assertion on PMIs on 64e to work around a problem caused + * by NMI PMIs incorrectly taking this interrupt return path, it's + * possible for this to hit after interrupt exit to user switches + * context to user. See also the comment in the performance monitor + * handler in exceptions-64e.S + */ + if (!IS_ENABLED(CONFIG_PPC_BOOK3E_64) && + TRAP(regs) != INTERRUPT_PROGRAM && + TRAP(regs) != INTERRUPT_PERFMON) + CT_WARN_ON(ct_state() == CONTEXT_USER); + + kuap = kuap_get_and_assert_locked(); + + local_irq_disable(); + + if (!arch_irq_disabled_regs(regs)) { + /* Returning to a kernel context with local irqs enabled. */ + WARN_ON_ONCE(!(regs->msr & MSR_EE)); +again: + if (IS_ENABLED(CONFIG_PREEMPT)) { + /* Return to preemptible kernel context */ + if (unlikely(read_thread_flags() & _TIF_NEED_RESCHED)) { + if (preempt_count() == 0) + preempt_schedule_irq(); + } + } + + check_return_regs_valid(regs); + + /* + * Stack store exit can't be restarted because the interrupt + * stack frame might have been clobbered. + */ + if (!prep_irq_for_enabled_exit(unlikely(stack_store))) { + /* + * Replay pending soft-masked interrupts now. Don't + * just local_irq_enabe(); local_irq_disable(); because + * if we are returning from an asynchronous interrupt + * here, another one might hit after irqs are enabled, + * and it would exit via this same path allowing + * another to fire, and so on unbounded. + */ + hard_irq_disable(); + replay_soft_interrupts(); + /* Took an interrupt, may have more exit work to do. */ + goto again; + } +#ifdef CONFIG_PPC64 + /* + * An interrupt may clear MSR[EE] and set this concurrently, + * but it will be marked pending and the exit will be retried. + * This leaves a racy window where MSR[EE]=0 and HARD_DIS is + * clear, until interrupt_exit_kernel_restart() calls + * hard_irq_disable(), which will set HARD_DIS again. + */ + local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS; + + } else { + check_return_regs_valid(regs); + + if (unlikely(stack_store)) + __hard_EE_RI_disable(); +#endif /* CONFIG_PPC64 */ + } + + if (unlikely(stack_store)) { + clear_bits(_TIF_EMULATE_STACK_STORE, ¤t_thread_info()->flags); + ret = 1; + } + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + local_paca->tm_scratch = regs->msr; +#endif + + /* + * 64s does not want to mfspr(SPRN_AMR) here, because this comes after + * mtmsr, which would cause Read-After-Write stalls. Hence, take the + * AMR value from the check above. + */ + kuap_kernel_restore(regs, kuap); + + return ret; +} + +#ifdef CONFIG_PPC64 +notrace unsigned long interrupt_exit_user_restart(struct pt_regs *regs) +{ + __hard_irq_disable(); + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + +#ifdef CONFIG_PPC_BOOK3S_64 + set_kuap(AMR_KUAP_BLOCKED); +#endif + + trace_hardirqs_off(); + user_exit_irqoff(); + account_cpu_user_entry(); + + BUG_ON(!user_mode(regs)); + + regs->exit_result |= interrupt_exit_user_prepare(regs); + + return regs->exit_result; +} + +/* + * No real need to return a value here because the stack store case does not + * get restarted. + */ +notrace unsigned long interrupt_exit_kernel_restart(struct pt_regs *regs) +{ + __hard_irq_disable(); + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + +#ifdef CONFIG_PPC_BOOK3S_64 + set_kuap(AMR_KUAP_BLOCKED); +#endif + + if (regs->softe == IRQS_ENABLED) + trace_hardirqs_off(); + + BUG_ON(user_mode(regs)); + + return interrupt_exit_kernel_prepare(regs); +} +#endif diff --git a/arch/powerpc/kernel/interrupt_64.S b/arch/powerpc/kernel/interrupt_64.S new file mode 100644 index 000000000..a019ed6fc --- /dev/null +++ b/arch/powerpc/kernel/interrupt_64.S @@ -0,0 +1,734 @@ +#include <asm/asm-offsets.h> +#include <asm/bug.h> +#ifdef CONFIG_PPC_BOOK3S +#include <asm/exception-64s.h> +#else +#include <asm/exception-64e.h> +#endif +#include <asm/feature-fixups.h> +#include <asm/head-64.h> +#include <asm/hw_irq.h> +#include <asm/kup.h> +#include <asm/mmu.h> +#include <asm/ppc_asm.h> +#include <asm/ptrace.h> + + .align 7 + +.macro DEBUG_SRR_VALID srr +#ifdef CONFIG_PPC_RFI_SRR_DEBUG + .ifc \srr,srr + mfspr r11,SPRN_SRR0 + ld r12,_NIP(r1) + clrrdi r11,r11,2 + clrrdi r12,r12,2 +100: tdne r11,r12 + EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) + mfspr r11,SPRN_SRR1 + ld r12,_MSR(r1) +100: tdne r11,r12 + EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) + .else + mfspr r11,SPRN_HSRR0 + ld r12,_NIP(r1) + clrrdi r11,r11,2 + clrrdi r12,r12,2 +100: tdne r11,r12 + EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) + mfspr r11,SPRN_HSRR1 + ld r12,_MSR(r1) +100: tdne r11,r12 + EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) + .endif +#endif +.endm + +#ifdef CONFIG_PPC_BOOK3S +.macro system_call_vectored name trapnr + .globl system_call_vectored_\name +system_call_vectored_\name: +_ASM_NOKPROBE_SYMBOL(system_call_vectored_\name) + SCV_INTERRUPT_TO_KERNEL + mr r10,r1 + ld r1,PACAKSAVE(r13) + std r10,0(r1) + std r11,_NIP(r1) + std r12,_MSR(r1) + std r0,GPR0(r1) + std r10,GPR1(r1) + std r2,GPR2(r1) + LOAD_PACA_TOC() + mfcr r12 + li r11,0 + /* Save syscall parameters in r3-r8 */ + SAVE_GPRS(3, 8, r1) + /* Zero r9-r12, this should only be required when restoring all GPRs */ + std r11,GPR9(r1) + std r11,GPR10(r1) + std r11,GPR11(r1) + std r11,GPR12(r1) + std r9,GPR13(r1) + SAVE_NVGPRS(r1) + std r11,_XER(r1) + std r11,_LINK(r1) + std r11,_CTR(r1) + + li r11,\trapnr + std r11,_TRAP(r1) + std r12,_CCR(r1) + std r3,ORIG_GPR3(r1) + /* Calling convention has r3 = regs, r4 = orig r0 */ + addi r3,r1,STACK_FRAME_OVERHEAD + mr r4,r0 + LOAD_REG_IMMEDIATE(r11, STACK_FRAME_REGS_MARKER) + std r11,-16(r3) /* "regshere" marker */ + +BEGIN_FTR_SECTION + HMT_MEDIUM +END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) + + /* + * scv enters with MSR[EE]=1 and is immediately considered soft-masked. + * The entry vector already sets PACAIRQSOFTMASK to IRQS_ALL_DISABLED, + * and interrupts may be masked and pending already. + * system_call_exception() will call trace_hardirqs_off() which means + * interrupts could already have been blocked before trace_hardirqs_off, + * but this is the best we can do. + */ + + bl system_call_exception + +.Lsyscall_vectored_\name\()_exit: + addi r4,r1,STACK_FRAME_OVERHEAD + li r5,1 /* scv */ + bl syscall_exit_prepare + std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */ +.Lsyscall_vectored_\name\()_rst_start: + lbz r11,PACAIRQHAPPENED(r13) + andi. r11,r11,(~PACA_IRQ_HARD_DIS)@l + bne- syscall_vectored_\name\()_restart + li r11,IRQS_ENABLED + stb r11,PACAIRQSOFTMASK(r13) + li r11,0 + stb r11,PACAIRQHAPPENED(r13) # clear out possible HARD_DIS + + ld r2,_CCR(r1) + ld r4,_NIP(r1) + ld r5,_MSR(r1) + +BEGIN_FTR_SECTION + stdcx. r0,0,r1 /* to clear the reservation */ +END_FTR_SECTION_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) + +BEGIN_FTR_SECTION + HMT_MEDIUM_LOW +END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) + + cmpdi r3,0 + bne .Lsyscall_vectored_\name\()_restore_regs + + /* rfscv returns with LR->NIA and CTR->MSR */ + mtlr r4 + mtctr r5 + + /* Could zero these as per ABI, but we may consider a stricter ABI + * which preserves these if libc implementations can benefit, so + * restore them for now until further measurement is done. */ + REST_GPR(0, r1) + REST_GPRS(4, 8, r1) + /* Zero volatile regs that may contain sensitive kernel data */ + ZEROIZE_GPRS(9, 12) + mtspr SPRN_XER,r0 + + /* + * We don't need to restore AMR on the way back to userspace for KUAP. + * The value of AMR only matters while we're in the kernel. + */ + mtcr r2 + REST_GPRS(2, 3, r1) + REST_GPR(13, r1) + REST_GPR(1, r1) + RFSCV_TO_USER + b . /* prevent speculative execution */ + +.Lsyscall_vectored_\name\()_restore_regs: + mtspr SPRN_SRR0,r4 + mtspr SPRN_SRR1,r5 + + ld r3,_CTR(r1) + ld r4,_LINK(r1) + ld r5,_XER(r1) + + REST_NVGPRS(r1) + REST_GPR(0, r1) + mtcr r2 + mtctr r3 + mtlr r4 + mtspr SPRN_XER,r5 + REST_GPRS(2, 13, r1) + REST_GPR(1, r1) + RFI_TO_USER +.Lsyscall_vectored_\name\()_rst_end: + +syscall_vectored_\name\()_restart: +_ASM_NOKPROBE_SYMBOL(syscall_vectored_\name\()_restart) + GET_PACA(r13) + ld r1,PACA_EXIT_SAVE_R1(r13) + LOAD_PACA_TOC() + ld r3,RESULT(r1) + addi r4,r1,STACK_FRAME_OVERHEAD + li r11,IRQS_ALL_DISABLED + stb r11,PACAIRQSOFTMASK(r13) + bl syscall_exit_restart + std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */ + b .Lsyscall_vectored_\name\()_rst_start +1: + +SOFT_MASK_TABLE(.Lsyscall_vectored_\name\()_rst_start, 1b) +RESTART_TABLE(.Lsyscall_vectored_\name\()_rst_start, .Lsyscall_vectored_\name\()_rst_end, syscall_vectored_\name\()_restart) + +.endm + +system_call_vectored common 0x3000 + +/* + * We instantiate another entry copy for the SIGILL variant, with TRAP=0x7ff0 + * which is tested by system_call_exception when r0 is -1 (as set by vector + * entry code). + */ +system_call_vectored sigill 0x7ff0 + +#endif /* CONFIG_PPC_BOOK3S */ + + .balign IFETCH_ALIGN_BYTES + .globl system_call_common_real +system_call_common_real: +_ASM_NOKPROBE_SYMBOL(system_call_common_real) + ld r10,PACAKMSR(r13) /* get MSR value for kernel */ + mtmsrd r10 + + .balign IFETCH_ALIGN_BYTES + .globl system_call_common +system_call_common: +_ASM_NOKPROBE_SYMBOL(system_call_common) + mr r10,r1 + ld r1,PACAKSAVE(r13) + std r10,0(r1) + std r11,_NIP(r1) + std r12,_MSR(r1) + std r0,GPR0(r1) + std r10,GPR1(r1) + std r2,GPR2(r1) +#ifdef CONFIG_PPC_E500 +START_BTB_FLUSH_SECTION + BTB_FLUSH(r10) +END_BTB_FLUSH_SECTION +#endif + LOAD_PACA_TOC() + mfcr r12 + li r11,0 + /* Save syscall parameters in r3-r8 */ + SAVE_GPRS(3, 8, r1) + /* Zero r9-r12, this should only be required when restoring all GPRs */ + std r11,GPR9(r1) + std r11,GPR10(r1) + std r11,GPR11(r1) + std r11,GPR12(r1) + std r9,GPR13(r1) + SAVE_NVGPRS(r1) + std r11,_XER(r1) + std r11,_CTR(r1) + mflr r10 + + /* + * This clears CR0.SO (bit 28), which is the error indication on + * return from this system call. + */ + rldimi r12,r11,28,(63-28) + li r11,0xc00 + std r10,_LINK(r1) + std r11,_TRAP(r1) + std r12,_CCR(r1) + std r3,ORIG_GPR3(r1) + /* Calling convention has r3 = regs, r4 = orig r0 */ + addi r3,r1,STACK_FRAME_OVERHEAD + mr r4,r0 + LOAD_REG_IMMEDIATE(r11, STACK_FRAME_REGS_MARKER) + std r11,-16(r3) /* "regshere" marker */ + +#ifdef CONFIG_PPC_BOOK3S + li r11,1 + stb r11,PACASRR_VALID(r13) +#endif + + /* + * We always enter kernel from userspace with irq soft-mask enabled and + * nothing pending. system_call_exception() will call + * trace_hardirqs_off(). + */ + li r11,IRQS_ALL_DISABLED + stb r11,PACAIRQSOFTMASK(r13) +#ifdef CONFIG_PPC_BOOK3S + li r12,-1 /* Set MSR_EE and MSR_RI */ + mtmsrd r12,1 +#else + wrteei 1 +#endif + + bl system_call_exception + +.Lsyscall_exit: + addi r4,r1,STACK_FRAME_OVERHEAD + li r5,0 /* !scv */ + bl syscall_exit_prepare + std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */ +#ifdef CONFIG_PPC_BOOK3S +.Lsyscall_rst_start: + lbz r11,PACAIRQHAPPENED(r13) + andi. r11,r11,(~PACA_IRQ_HARD_DIS)@l + bne- syscall_restart +#endif + li r11,IRQS_ENABLED + stb r11,PACAIRQSOFTMASK(r13) + li r11,0 + stb r11,PACAIRQHAPPENED(r13) # clear out possible HARD_DIS + + ld r2,_CCR(r1) + ld r6,_LINK(r1) + mtlr r6 + +#ifdef CONFIG_PPC_BOOK3S + lbz r4,PACASRR_VALID(r13) + cmpdi r4,0 + bne 1f + li r4,0 + stb r4,PACASRR_VALID(r13) +#endif + ld r4,_NIP(r1) + ld r5,_MSR(r1) + mtspr SPRN_SRR0,r4 + mtspr SPRN_SRR1,r5 +1: + DEBUG_SRR_VALID srr + +BEGIN_FTR_SECTION + stdcx. r0,0,r1 /* to clear the reservation */ +END_FTR_SECTION_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) + + cmpdi r3,0 + bne .Lsyscall_restore_regs + /* Zero volatile regs that may contain sensitive kernel data */ + ZEROIZE_GPR(0) + ZEROIZE_GPRS(4, 12) + mtctr r0 + mtspr SPRN_XER,r0 +.Lsyscall_restore_regs_cont: + +BEGIN_FTR_SECTION + HMT_MEDIUM_LOW +END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) + + /* + * We don't need to restore AMR on the way back to userspace for KUAP. + * The value of AMR only matters while we're in the kernel. + */ + mtcr r2 + REST_GPRS(2, 3, r1) + REST_GPR(13, r1) + REST_GPR(1, r1) + RFI_TO_USER + b . /* prevent speculative execution */ + +.Lsyscall_restore_regs: + ld r3,_CTR(r1) + ld r4,_XER(r1) + REST_NVGPRS(r1) + mtctr r3 + mtspr SPRN_XER,r4 + REST_GPR(0, r1) + REST_GPRS(4, 12, r1) + b .Lsyscall_restore_regs_cont +.Lsyscall_rst_end: + +#ifdef CONFIG_PPC_BOOK3S +syscall_restart: +_ASM_NOKPROBE_SYMBOL(syscall_restart) + GET_PACA(r13) + ld r1,PACA_EXIT_SAVE_R1(r13) + LOAD_PACA_TOC() + ld r3,RESULT(r1) + addi r4,r1,STACK_FRAME_OVERHEAD + li r11,IRQS_ALL_DISABLED + stb r11,PACAIRQSOFTMASK(r13) + bl syscall_exit_restart + std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */ + b .Lsyscall_rst_start +1: + +SOFT_MASK_TABLE(.Lsyscall_rst_start, 1b) +RESTART_TABLE(.Lsyscall_rst_start, .Lsyscall_rst_end, syscall_restart) +#endif + + /* + * If MSR EE/RI was never enabled, IRQs not reconciled, NVGPRs not + * touched, no exit work created, then this can be used. + */ + .balign IFETCH_ALIGN_BYTES + .globl fast_interrupt_return_srr +fast_interrupt_return_srr: +_ASM_NOKPROBE_SYMBOL(fast_interrupt_return_srr) + kuap_check_amr r3, r4 + ld r5,_MSR(r1) + andi. r0,r5,MSR_PR +#ifdef CONFIG_PPC_BOOK3S + beq 1f + kuap_user_restore r3, r4 + b .Lfast_user_interrupt_return_srr +1: kuap_kernel_restore r3, r4 + andi. r0,r5,MSR_RI + li r3,0 /* 0 return value, no EMULATE_STACK_STORE */ + bne+ .Lfast_kernel_interrupt_return_srr + addi r3,r1,STACK_FRAME_OVERHEAD + bl unrecoverable_exception + b . /* should not get here */ +#else + bne .Lfast_user_interrupt_return_srr + b .Lfast_kernel_interrupt_return_srr +#endif + +.macro interrupt_return_macro srr + .balign IFETCH_ALIGN_BYTES + .globl interrupt_return_\srr +interrupt_return_\srr\(): +_ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()) + ld r4,_MSR(r1) + andi. r0,r4,MSR_PR + beq interrupt_return_\srr\()_kernel +interrupt_return_\srr\()_user: /* make backtraces match the _kernel variant */ +_ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()_user) + addi r3,r1,STACK_FRAME_OVERHEAD + bl interrupt_exit_user_prepare + cmpdi r3,0 + bne- .Lrestore_nvgprs_\srr +.Lrestore_nvgprs_\srr\()_cont: + std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */ +#ifdef CONFIG_PPC_BOOK3S +.Linterrupt_return_\srr\()_user_rst_start: + lbz r11,PACAIRQHAPPENED(r13) + andi. r11,r11,(~PACA_IRQ_HARD_DIS)@l + bne- interrupt_return_\srr\()_user_restart +#endif + li r11,IRQS_ENABLED + stb r11,PACAIRQSOFTMASK(r13) + li r11,0 + stb r11,PACAIRQHAPPENED(r13) # clear out possible HARD_DIS + +.Lfast_user_interrupt_return_\srr\(): +#ifdef CONFIG_PPC_BOOK3S + .ifc \srr,srr + lbz r4,PACASRR_VALID(r13) + .else + lbz r4,PACAHSRR_VALID(r13) + .endif + cmpdi r4,0 + li r4,0 + bne 1f +#endif + ld r11,_NIP(r1) + ld r12,_MSR(r1) + .ifc \srr,srr + mtspr SPRN_SRR0,r11 + mtspr SPRN_SRR1,r12 +1: +#ifdef CONFIG_PPC_BOOK3S + stb r4,PACASRR_VALID(r13) +#endif + .else + mtspr SPRN_HSRR0,r11 + mtspr SPRN_HSRR1,r12 +1: +#ifdef CONFIG_PPC_BOOK3S + stb r4,PACAHSRR_VALID(r13) +#endif + .endif + DEBUG_SRR_VALID \srr + +#ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG + lbz r4,PACAIRQSOFTMASK(r13) + tdnei r4,IRQS_ENABLED +#endif + +BEGIN_FTR_SECTION + ld r10,_PPR(r1) + mtspr SPRN_PPR,r10 +END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) + +BEGIN_FTR_SECTION + stdcx. r0,0,r1 /* to clear the reservation */ +FTR_SECTION_ELSE + ldarx r0,0,r1 +ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) + + ld r3,_CCR(r1) + ld r4,_LINK(r1) + ld r5,_CTR(r1) + ld r6,_XER(r1) + li r0,0 + + REST_GPRS(7, 13, r1) + + mtcr r3 + mtlr r4 + mtctr r5 + mtspr SPRN_XER,r6 + + REST_GPRS(2, 6, r1) + REST_GPR(0, r1) + REST_GPR(1, r1) + .ifc \srr,srr + RFI_TO_USER + .else + HRFI_TO_USER + .endif + b . /* prevent speculative execution */ +.Linterrupt_return_\srr\()_user_rst_end: + +.Lrestore_nvgprs_\srr\(): + REST_NVGPRS(r1) + b .Lrestore_nvgprs_\srr\()_cont + +#ifdef CONFIG_PPC_BOOK3S +interrupt_return_\srr\()_user_restart: +_ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()_user_restart) + GET_PACA(r13) + ld r1,PACA_EXIT_SAVE_R1(r13) + LOAD_PACA_TOC() + addi r3,r1,STACK_FRAME_OVERHEAD + li r11,IRQS_ALL_DISABLED + stb r11,PACAIRQSOFTMASK(r13) + bl interrupt_exit_user_restart + std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */ + b .Linterrupt_return_\srr\()_user_rst_start +1: + +SOFT_MASK_TABLE(.Linterrupt_return_\srr\()_user_rst_start, 1b) +RESTART_TABLE(.Linterrupt_return_\srr\()_user_rst_start, .Linterrupt_return_\srr\()_user_rst_end, interrupt_return_\srr\()_user_restart) +#endif + + .balign IFETCH_ALIGN_BYTES +interrupt_return_\srr\()_kernel: +_ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()_kernel) + addi r3,r1,STACK_FRAME_OVERHEAD + bl interrupt_exit_kernel_prepare + + std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */ +.Linterrupt_return_\srr\()_kernel_rst_start: + ld r11,SOFTE(r1) + cmpwi r11,IRQS_ENABLED + stb r11,PACAIRQSOFTMASK(r13) + beq .Linterrupt_return_\srr\()_soft_enabled + + /* + * Returning to soft-disabled context. + * Check if a MUST_HARD_MASK interrupt has become pending, in which + * case we need to disable MSR[EE] in the return context. + * + * The MSR[EE] check catches among other things the short incoherency + * in hard_irq_disable() between clearing MSR[EE] and setting + * PACA_IRQ_HARD_DIS. + */ + ld r12,_MSR(r1) + andi. r10,r12,MSR_EE + beq .Lfast_kernel_interrupt_return_\srr\() // EE already disabled + lbz r11,PACAIRQHAPPENED(r13) + andi. r10,r11,PACA_IRQ_MUST_HARD_MASK + bne 1f // HARD_MASK is pending + // No HARD_MASK pending, clear possible HARD_DIS set by interrupt + andi. r11,r11,(~PACA_IRQ_HARD_DIS)@l + stb r11,PACAIRQHAPPENED(r13) + b .Lfast_kernel_interrupt_return_\srr\() + + +1: /* Must clear MSR_EE from _MSR */ +#ifdef CONFIG_PPC_BOOK3S + li r10,0 + /* Clear valid before changing _MSR */ + .ifc \srr,srr + stb r10,PACASRR_VALID(r13) + .else + stb r10,PACAHSRR_VALID(r13) + .endif +#endif + xori r12,r12,MSR_EE + std r12,_MSR(r1) + b .Lfast_kernel_interrupt_return_\srr\() + +.Linterrupt_return_\srr\()_soft_enabled: + /* + * In the soft-enabled case, need to double-check that we have no + * pending interrupts that might have come in before we reached the + * restart section of code, and restart the exit so those can be + * handled. + * + * If there are none, it is be possible that the interrupt still + * has PACA_IRQ_HARD_DIS set, which needs to be cleared for the + * interrupted context. This clear will not clobber a new pending + * interrupt coming in, because we're in the restart section, so + * such would return to the restart location. + */ +#ifdef CONFIG_PPC_BOOK3S + lbz r11,PACAIRQHAPPENED(r13) + andi. r11,r11,(~PACA_IRQ_HARD_DIS)@l + bne- interrupt_return_\srr\()_kernel_restart +#endif + li r11,0 + stb r11,PACAIRQHAPPENED(r13) // clear the possible HARD_DIS + +.Lfast_kernel_interrupt_return_\srr\(): + cmpdi cr1,r3,0 +#ifdef CONFIG_PPC_BOOK3S + .ifc \srr,srr + lbz r4,PACASRR_VALID(r13) + .else + lbz r4,PACAHSRR_VALID(r13) + .endif + cmpdi r4,0 + li r4,0 + bne 1f +#endif + ld r11,_NIP(r1) + ld r12,_MSR(r1) + .ifc \srr,srr + mtspr SPRN_SRR0,r11 + mtspr SPRN_SRR1,r12 +1: +#ifdef CONFIG_PPC_BOOK3S + stb r4,PACASRR_VALID(r13) +#endif + .else + mtspr SPRN_HSRR0,r11 + mtspr SPRN_HSRR1,r12 +1: +#ifdef CONFIG_PPC_BOOK3S + stb r4,PACAHSRR_VALID(r13) +#endif + .endif + DEBUG_SRR_VALID \srr + +BEGIN_FTR_SECTION + stdcx. r0,0,r1 /* to clear the reservation */ +FTR_SECTION_ELSE + ldarx r0,0,r1 +ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) + + ld r3,_LINK(r1) + ld r4,_CTR(r1) + ld r5,_XER(r1) + ld r6,_CCR(r1) + li r0,0 + + REST_GPRS(7, 12, r1) + + mtlr r3 + mtctr r4 + mtspr SPRN_XER,r5 + + /* + * Leaving a stale STACK_FRAME_REGS_MARKER on the stack can confuse + * the reliable stack unwinder later on. Clear it. + */ + std r0,STACK_FRAME_OVERHEAD-16(r1) + + REST_GPRS(2, 5, r1) + + bne- cr1,1f /* emulate stack store */ + mtcr r6 + REST_GPR(6, r1) + REST_GPR(0, r1) + REST_GPR(1, r1) + .ifc \srr,srr + RFI_TO_KERNEL + .else + HRFI_TO_KERNEL + .endif + b . /* prevent speculative execution */ + +1: /* + * Emulate stack store with update. New r1 value was already calculated + * and updated in our interrupt regs by emulate_loadstore, but we can't + * store the previous value of r1 to the stack before re-loading our + * registers from it, otherwise they could be clobbered. Use + * PACA_EXGEN as temporary storage to hold the store data, as + * interrupts are disabled here so it won't be clobbered. + */ + mtcr r6 + std r9,PACA_EXGEN+0(r13) + addi r9,r1,INT_FRAME_SIZE /* get original r1 */ + REST_GPR(6, r1) + REST_GPR(0, r1) + REST_GPR(1, r1) + std r9,0(r1) /* perform store component of stdu */ + ld r9,PACA_EXGEN+0(r13) + + .ifc \srr,srr + RFI_TO_KERNEL + .else + HRFI_TO_KERNEL + .endif + b . /* prevent speculative execution */ +.Linterrupt_return_\srr\()_kernel_rst_end: + +#ifdef CONFIG_PPC_BOOK3S +interrupt_return_\srr\()_kernel_restart: +_ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()_kernel_restart) + GET_PACA(r13) + ld r1,PACA_EXIT_SAVE_R1(r13) + LOAD_PACA_TOC() + addi r3,r1,STACK_FRAME_OVERHEAD + li r11,IRQS_ALL_DISABLED + stb r11,PACAIRQSOFTMASK(r13) + bl interrupt_exit_kernel_restart + std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */ + b .Linterrupt_return_\srr\()_kernel_rst_start +1: + +SOFT_MASK_TABLE(.Linterrupt_return_\srr\()_kernel_rst_start, 1b) +RESTART_TABLE(.Linterrupt_return_\srr\()_kernel_rst_start, .Linterrupt_return_\srr\()_kernel_rst_end, interrupt_return_\srr\()_kernel_restart) +#endif + +.endm + +interrupt_return_macro srr +#ifdef CONFIG_PPC_BOOK3S +interrupt_return_macro hsrr + + .globl __end_soft_masked +__end_soft_masked: +DEFINE_FIXED_SYMBOL(__end_soft_masked, text) +#endif /* CONFIG_PPC_BOOK3S */ + +#ifdef CONFIG_PPC_BOOK3S +_GLOBAL(ret_from_fork_scv) + bl schedule_tail + REST_NVGPRS(r1) + li r3,0 /* fork() return value */ + b .Lsyscall_vectored_common_exit +#endif + +_GLOBAL(ret_from_fork) + bl schedule_tail + REST_NVGPRS(r1) + li r3,0 /* fork() return value */ + b .Lsyscall_exit + +_GLOBAL(ret_from_kernel_thread) + bl schedule_tail + REST_NVGPRS(r1) + mtctr r14 + mr r3,r15 +#ifdef CONFIG_PPC64_ELF_ABI_V2 + mr r12,r14 +#endif + bctrl + li r3,0 + b .Lsyscall_exit diff --git a/arch/powerpc/kernel/io-workarounds.c b/arch/powerpc/kernel/io-workarounds.c new file mode 100644 index 000000000..c877f074d --- /dev/null +++ b/arch/powerpc/kernel/io-workarounds.c @@ -0,0 +1,197 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Support PCI IO workaround + * + * Copyright (C) 2006 Benjamin Herrenschmidt <benh@kernel.crashing.org> + * IBM, Corp. + * (C) Copyright 2007-2008 TOSHIBA CORPORATION + */ +#undef DEBUG + +#include <linux/kernel.h> +#include <linux/sched/mm.h> /* for init_mm */ +#include <linux/pgtable.h> + +#include <asm/io.h> +#include <asm/machdep.h> +#include <asm/ppc-pci.h> +#include <asm/io-workarounds.h> +#include <asm/pte-walk.h> + + +#define IOWA_MAX_BUS 8 + +static struct iowa_bus iowa_busses[IOWA_MAX_BUS]; +static unsigned int iowa_bus_count; + +static struct iowa_bus *iowa_pci_find(unsigned long vaddr, unsigned long paddr) +{ + int i, j; + struct resource *res; + unsigned long vstart, vend; + + for (i = 0; i < iowa_bus_count; i++) { + struct iowa_bus *bus = &iowa_busses[i]; + struct pci_controller *phb = bus->phb; + + if (vaddr) { + vstart = (unsigned long)phb->io_base_virt; + vend = vstart + phb->pci_io_size - 1; + if ((vaddr >= vstart) && (vaddr <= vend)) + return bus; + } + + if (paddr) + for (j = 0; j < 3; j++) { + res = &phb->mem_resources[j]; + if (paddr >= res->start && paddr <= res->end) + return bus; + } + } + + return NULL; +} + +#ifdef CONFIG_PPC_INDIRECT_MMIO +struct iowa_bus *iowa_mem_find_bus(const PCI_IO_ADDR addr) +{ + struct iowa_bus *bus; + int token; + + token = PCI_GET_ADDR_TOKEN(addr); + + if (token && token <= iowa_bus_count) + bus = &iowa_busses[token - 1]; + else { + unsigned long vaddr, paddr; + + vaddr = (unsigned long)PCI_FIX_ADDR(addr); + if (vaddr < PHB_IO_BASE || vaddr >= PHB_IO_END) + return NULL; + + paddr = ppc_find_vmap_phys(vaddr); + + bus = iowa_pci_find(vaddr, paddr); + + if (bus == NULL) + return NULL; + } + + return bus; +} +#else /* CONFIG_PPC_INDIRECT_MMIO */ +struct iowa_bus *iowa_mem_find_bus(const PCI_IO_ADDR addr) +{ + return NULL; +} +#endif /* !CONFIG_PPC_INDIRECT_MMIO */ + +#ifdef CONFIG_PPC_INDIRECT_PIO +struct iowa_bus *iowa_pio_find_bus(unsigned long port) +{ + unsigned long vaddr = (unsigned long)pci_io_base + port; + return iowa_pci_find(vaddr, 0); +} +#else +struct iowa_bus *iowa_pio_find_bus(unsigned long port) +{ + return NULL; +} +#endif + +#define DEF_PCI_AC_RET(name, ret, at, al, space, aa) \ +static ret iowa_##name at \ +{ \ + struct iowa_bus *bus; \ + bus = iowa_##space##_find_bus(aa); \ + if (bus && bus->ops && bus->ops->name) \ + return bus->ops->name al; \ + return __do_##name al; \ +} + +#define DEF_PCI_AC_NORET(name, at, al, space, aa) \ +static void iowa_##name at \ +{ \ + struct iowa_bus *bus; \ + bus = iowa_##space##_find_bus(aa); \ + if (bus && bus->ops && bus->ops->name) { \ + bus->ops->name al; \ + return; \ + } \ + __do_##name al; \ +} + +#include <asm/io-defs.h> + +#undef DEF_PCI_AC_RET +#undef DEF_PCI_AC_NORET + +static const struct ppc_pci_io iowa_pci_io = { + +#define DEF_PCI_AC_RET(name, ret, at, al, space, aa) .name = iowa_##name, +#define DEF_PCI_AC_NORET(name, at, al, space, aa) .name = iowa_##name, + +#include <asm/io-defs.h> + +#undef DEF_PCI_AC_RET +#undef DEF_PCI_AC_NORET + +}; + +#ifdef CONFIG_PPC_INDIRECT_MMIO +void __iomem *iowa_ioremap(phys_addr_t addr, unsigned long size, + pgprot_t prot, void *caller) +{ + struct iowa_bus *bus; + void __iomem *res = __ioremap_caller(addr, size, prot, caller); + int busno; + + bus = iowa_pci_find(0, (unsigned long)addr); + if (bus != NULL) { + busno = bus - iowa_busses; + PCI_SET_ADDR_TOKEN(res, busno + 1); + } + return res; +} +#endif /* !CONFIG_PPC_INDIRECT_MMIO */ + +bool io_workaround_inited; + +/* Enable IO workaround */ +static void io_workaround_init(void) +{ + if (io_workaround_inited) + return; + ppc_pci_io = iowa_pci_io; + io_workaround_inited = true; +} + +/* Register new bus to support workaround */ +void iowa_register_bus(struct pci_controller *phb, struct ppc_pci_io *ops, + int (*initfunc)(struct iowa_bus *, void *), void *data) +{ + struct iowa_bus *bus; + struct device_node *np = phb->dn; + + io_workaround_init(); + + if (iowa_bus_count >= IOWA_MAX_BUS) { + pr_err("IOWA:Too many pci bridges, " + "workarounds disabled for %pOF\n", np); + return; + } + + bus = &iowa_busses[iowa_bus_count]; + bus->phb = phb; + bus->ops = ops; + bus->private = data; + + if (initfunc) + if ((*initfunc)(bus, data)) + return; + + iowa_bus_count++; + + pr_debug("IOWA:[%d]Add bus, %pOF.\n", iowa_bus_count-1, np); +} + diff --git a/arch/powerpc/kernel/io.c b/arch/powerpc/kernel/io.c new file mode 100644 index 000000000..2f29b7d43 --- /dev/null +++ b/arch/powerpc/kernel/io.c @@ -0,0 +1,206 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * I/O string operations + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * Copyright (C) 2006 IBM Corporation + * + * Largely rewritten by Cort Dougan (cort@cs.nmt.edu) + * and Paul Mackerras. + * + * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com) + * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com) + * + * Rewritten in C by Stephen Rothwell. + */ +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/compiler.h> +#include <linux/export.h> + +#include <asm/io.h> +#include <asm/firmware.h> +#include <asm/bug.h> + +/* See definition in io.h */ +bool isa_io_special; + +void _insb(const volatile u8 __iomem *port, void *buf, long count) +{ + u8 *tbuf = buf; + u8 tmp; + + if (unlikely(count <= 0)) + return; + asm volatile("sync"); + do { + tmp = *port; + eieio(); + *tbuf++ = tmp; + } while (--count != 0); + asm volatile("twi 0,%0,0; isync" : : "r" (tmp)); +} +EXPORT_SYMBOL(_insb); + +void _outsb(volatile u8 __iomem *port, const void *buf, long count) +{ + const u8 *tbuf = buf; + + if (unlikely(count <= 0)) + return; + asm volatile("sync"); + do { + *port = *tbuf++; + } while (--count != 0); + asm volatile("sync"); +} +EXPORT_SYMBOL(_outsb); + +void _insw_ns(const volatile u16 __iomem *port, void *buf, long count) +{ + u16 *tbuf = buf; + u16 tmp; + + if (unlikely(count <= 0)) + return; + asm volatile("sync"); + do { + tmp = *port; + eieio(); + *tbuf++ = tmp; + } while (--count != 0); + asm volatile("twi 0,%0,0; isync" : : "r" (tmp)); +} +EXPORT_SYMBOL(_insw_ns); + +void _outsw_ns(volatile u16 __iomem *port, const void *buf, long count) +{ + const u16 *tbuf = buf; + + if (unlikely(count <= 0)) + return; + asm volatile("sync"); + do { + *port = *tbuf++; + } while (--count != 0); + asm volatile("sync"); +} +EXPORT_SYMBOL(_outsw_ns); + +void _insl_ns(const volatile u32 __iomem *port, void *buf, long count) +{ + u32 *tbuf = buf; + u32 tmp; + + if (unlikely(count <= 0)) + return; + asm volatile("sync"); + do { + tmp = *port; + eieio(); + *tbuf++ = tmp; + } while (--count != 0); + asm volatile("twi 0,%0,0; isync" : : "r" (tmp)); +} +EXPORT_SYMBOL(_insl_ns); + +void _outsl_ns(volatile u32 __iomem *port, const void *buf, long count) +{ + const u32 *tbuf = buf; + + if (unlikely(count <= 0)) + return; + asm volatile("sync"); + do { + *port = *tbuf++; + } while (--count != 0); + asm volatile("sync"); +} +EXPORT_SYMBOL(_outsl_ns); + +#define IO_CHECK_ALIGN(v,a) ((((unsigned long)(v)) & ((a) - 1)) == 0) + +notrace void +_memset_io(volatile void __iomem *addr, int c, unsigned long n) +{ + void *p = (void __force *)addr; + u32 lc = c; + lc |= lc << 8; + lc |= lc << 16; + + __asm__ __volatile__ ("sync" : : : "memory"); + while(n && !IO_CHECK_ALIGN(p, 4)) { + *((volatile u8 *)p) = c; + p++; + n--; + } + while(n >= 4) { + *((volatile u32 *)p) = lc; + p += 4; + n -= 4; + } + while(n) { + *((volatile u8 *)p) = c; + p++; + n--; + } + __asm__ __volatile__ ("sync" : : : "memory"); +} +EXPORT_SYMBOL(_memset_io); + +void _memcpy_fromio(void *dest, const volatile void __iomem *src, + unsigned long n) +{ + void *vsrc = (void __force *) src; + + __asm__ __volatile__ ("sync" : : : "memory"); + while(n && (!IO_CHECK_ALIGN(vsrc, 4) || !IO_CHECK_ALIGN(dest, 4))) { + *((u8 *)dest) = *((volatile u8 *)vsrc); + eieio(); + vsrc++; + dest++; + n--; + } + while(n >= 4) { + *((u32 *)dest) = *((volatile u32 *)vsrc); + eieio(); + vsrc += 4; + dest += 4; + n -= 4; + } + while(n) { + *((u8 *)dest) = *((volatile u8 *)vsrc); + eieio(); + vsrc++; + dest++; + n--; + } + __asm__ __volatile__ ("sync" : : : "memory"); +} +EXPORT_SYMBOL(_memcpy_fromio); + +void _memcpy_toio(volatile void __iomem *dest, const void *src, unsigned long n) +{ + void *vdest = (void __force *) dest; + + __asm__ __volatile__ ("sync" : : : "memory"); + while(n && (!IO_CHECK_ALIGN(vdest, 4) || !IO_CHECK_ALIGN(src, 4))) { + *((volatile u8 *)vdest) = *((u8 *)src); + src++; + vdest++; + n--; + } + while(n >= 4) { + *((volatile u32 *)vdest) = *((volatile u32 *)src); + src += 4; + vdest += 4; + n-=4; + } + while(n) { + *((volatile u8 *)vdest) = *((u8 *)src); + src++; + vdest++; + n--; + } + __asm__ __volatile__ ("sync" : : : "memory"); +} +EXPORT_SYMBOL(_memcpy_toio); diff --git a/arch/powerpc/kernel/iomap.c b/arch/powerpc/kernel/iomap.c new file mode 100644 index 000000000..72862a4d3 --- /dev/null +++ b/arch/powerpc/kernel/iomap.c @@ -0,0 +1,31 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ppc64 "iomap" interface implementation. + * + * (C) Copyright 2004 Linus Torvalds + */ +#include <linux/pci.h> +#include <linux/mm.h> +#include <linux/export.h> +#include <asm/io.h> +#include <asm/pci-bridge.h> +#include <asm/isa-bridge.h> + +void __iomem *ioport_map(unsigned long port, unsigned int len) +{ + return (void __iomem *) (port + _IO_BASE); +} +EXPORT_SYMBOL(ioport_map); + +#ifdef CONFIG_PCI +void pci_iounmap(struct pci_dev *dev, void __iomem *addr) +{ + if (isa_vaddr_is_ioport(addr)) + return; + if (pcibios_vaddr_is_ioport(addr)) + return; + iounmap(addr); +} + +EXPORT_SYMBOL(pci_iounmap); +#endif /* CONFIG_PCI */ diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c new file mode 100644 index 000000000..a612abe4b --- /dev/null +++ b/arch/powerpc/kernel/iommu.c @@ -0,0 +1,1196 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation + * + * Rewrite, cleanup, new allocation schemes, virtual merging: + * Copyright (C) 2004 Olof Johansson, IBM Corporation + * and Ben. Herrenschmidt, IBM Corporation + * + * Dynamic DMA mapping support, bus-independent parts. + */ + + +#include <linux/init.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/mm.h> +#include <linux/spinlock.h> +#include <linux/string.h> +#include <linux/dma-mapping.h> +#include <linux/bitmap.h> +#include <linux/iommu-helper.h> +#include <linux/crash_dump.h> +#include <linux/hash.h> +#include <linux/fault-inject.h> +#include <linux/pci.h> +#include <linux/iommu.h> +#include <linux/sched.h> +#include <linux/debugfs.h> +#include <asm/io.h> +#include <asm/iommu.h> +#include <asm/pci-bridge.h> +#include <asm/machdep.h> +#include <asm/kdump.h> +#include <asm/fadump.h> +#include <asm/vio.h> +#include <asm/tce.h> +#include <asm/mmu_context.h> + +#define DBG(...) + +#ifdef CONFIG_IOMMU_DEBUGFS +static int iommu_debugfs_weight_get(void *data, u64 *val) +{ + struct iommu_table *tbl = data; + *val = bitmap_weight(tbl->it_map, tbl->it_size); + return 0; +} +DEFINE_DEBUGFS_ATTRIBUTE(iommu_debugfs_fops_weight, iommu_debugfs_weight_get, NULL, "%llu\n"); + +static void iommu_debugfs_add(struct iommu_table *tbl) +{ + char name[10]; + struct dentry *liobn_entry; + + sprintf(name, "%08lx", tbl->it_index); + liobn_entry = debugfs_create_dir(name, iommu_debugfs_dir); + + debugfs_create_file_unsafe("weight", 0400, liobn_entry, tbl, &iommu_debugfs_fops_weight); + debugfs_create_ulong("it_size", 0400, liobn_entry, &tbl->it_size); + debugfs_create_ulong("it_page_shift", 0400, liobn_entry, &tbl->it_page_shift); + debugfs_create_ulong("it_reserved_start", 0400, liobn_entry, &tbl->it_reserved_start); + debugfs_create_ulong("it_reserved_end", 0400, liobn_entry, &tbl->it_reserved_end); + debugfs_create_ulong("it_indirect_levels", 0400, liobn_entry, &tbl->it_indirect_levels); + debugfs_create_ulong("it_level_size", 0400, liobn_entry, &tbl->it_level_size); +} + +static void iommu_debugfs_del(struct iommu_table *tbl) +{ + char name[10]; + + sprintf(name, "%08lx", tbl->it_index); + debugfs_lookup_and_remove(name, iommu_debugfs_dir); +} +#else +static void iommu_debugfs_add(struct iommu_table *tbl){} +static void iommu_debugfs_del(struct iommu_table *tbl){} +#endif + +static int novmerge; + +static void __iommu_free(struct iommu_table *, dma_addr_t, unsigned int); + +static int __init setup_iommu(char *str) +{ + if (!strcmp(str, "novmerge")) + novmerge = 1; + else if (!strcmp(str, "vmerge")) + novmerge = 0; + return 1; +} + +__setup("iommu=", setup_iommu); + +static DEFINE_PER_CPU(unsigned int, iommu_pool_hash); + +/* + * We precalculate the hash to avoid doing it on every allocation. + * + * The hash is important to spread CPUs across all the pools. For example, + * on a POWER7 with 4 way SMT we want interrupts on the primary threads and + * with 4 pools all primary threads would map to the same pool. + */ +static int __init setup_iommu_pool_hash(void) +{ + unsigned int i; + + for_each_possible_cpu(i) + per_cpu(iommu_pool_hash, i) = hash_32(i, IOMMU_POOL_HASHBITS); + + return 0; +} +subsys_initcall(setup_iommu_pool_hash); + +#ifdef CONFIG_FAIL_IOMMU + +static DECLARE_FAULT_ATTR(fail_iommu); + +static int __init setup_fail_iommu(char *str) +{ + return setup_fault_attr(&fail_iommu, str); +} +__setup("fail_iommu=", setup_fail_iommu); + +static bool should_fail_iommu(struct device *dev) +{ + return dev->archdata.fail_iommu && should_fail(&fail_iommu, 1); +} + +static int __init fail_iommu_debugfs(void) +{ + struct dentry *dir = fault_create_debugfs_attr("fail_iommu", + NULL, &fail_iommu); + + return PTR_ERR_OR_ZERO(dir); +} +late_initcall(fail_iommu_debugfs); + +static ssize_t fail_iommu_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", dev->archdata.fail_iommu); +} + +static ssize_t fail_iommu_store(struct device *dev, + struct device_attribute *attr, const char *buf, + size_t count) +{ + int i; + + if (count > 0 && sscanf(buf, "%d", &i) > 0) + dev->archdata.fail_iommu = (i == 0) ? 0 : 1; + + return count; +} + +static DEVICE_ATTR_RW(fail_iommu); + +static int fail_iommu_bus_notify(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct device *dev = data; + + if (action == BUS_NOTIFY_ADD_DEVICE) { + if (device_create_file(dev, &dev_attr_fail_iommu)) + pr_warn("Unable to create IOMMU fault injection sysfs " + "entries\n"); + } else if (action == BUS_NOTIFY_DEL_DEVICE) { + device_remove_file(dev, &dev_attr_fail_iommu); + } + + return 0; +} + +/* + * PCI and VIO buses need separate notifier_block structs, since they're linked + * list nodes. Sharing a notifier_block would mean that any notifiers later + * registered for PCI buses would also get called by VIO buses and vice versa. + */ +static struct notifier_block fail_iommu_pci_bus_notifier = { + .notifier_call = fail_iommu_bus_notify +}; + +#ifdef CONFIG_IBMVIO +static struct notifier_block fail_iommu_vio_bus_notifier = { + .notifier_call = fail_iommu_bus_notify +}; +#endif + +static int __init fail_iommu_setup(void) +{ +#ifdef CONFIG_PCI + bus_register_notifier(&pci_bus_type, &fail_iommu_pci_bus_notifier); +#endif +#ifdef CONFIG_IBMVIO + bus_register_notifier(&vio_bus_type, &fail_iommu_vio_bus_notifier); +#endif + + return 0; +} +/* + * Must execute after PCI and VIO subsystem have initialised but before + * devices are probed. + */ +arch_initcall(fail_iommu_setup); +#else +static inline bool should_fail_iommu(struct device *dev) +{ + return false; +} +#endif + +static unsigned long iommu_range_alloc(struct device *dev, + struct iommu_table *tbl, + unsigned long npages, + unsigned long *handle, + unsigned long mask, + unsigned int align_order) +{ + unsigned long n, end, start; + unsigned long limit; + int largealloc = npages > 15; + int pass = 0; + unsigned long align_mask; + unsigned long flags; + unsigned int pool_nr; + struct iommu_pool *pool; + + align_mask = (1ull << align_order) - 1; + + /* This allocator was derived from x86_64's bit string search */ + + /* Sanity check */ + if (unlikely(npages == 0)) { + if (printk_ratelimit()) + WARN_ON(1); + return DMA_MAPPING_ERROR; + } + + if (should_fail_iommu(dev)) + return DMA_MAPPING_ERROR; + + /* + * We don't need to disable preemption here because any CPU can + * safely use any IOMMU pool. + */ + pool_nr = raw_cpu_read(iommu_pool_hash) & (tbl->nr_pools - 1); + + if (largealloc) + pool = &(tbl->large_pool); + else + pool = &(tbl->pools[pool_nr]); + + spin_lock_irqsave(&(pool->lock), flags); + +again: + if ((pass == 0) && handle && *handle && + (*handle >= pool->start) && (*handle < pool->end)) + start = *handle; + else + start = pool->hint; + + limit = pool->end; + + /* The case below can happen if we have a small segment appended + * to a large, or when the previous alloc was at the very end of + * the available space. If so, go back to the initial start. + */ + if (start >= limit) + start = pool->start; + + if (limit + tbl->it_offset > mask) { + limit = mask - tbl->it_offset + 1; + /* If we're constrained on address range, first try + * at the masked hint to avoid O(n) search complexity, + * but on second pass, start at 0 in pool 0. + */ + if ((start & mask) >= limit || pass > 0) { + spin_unlock(&(pool->lock)); + pool = &(tbl->pools[0]); + spin_lock(&(pool->lock)); + start = pool->start; + } else { + start &= mask; + } + } + + n = iommu_area_alloc(tbl->it_map, limit, start, npages, tbl->it_offset, + dma_get_seg_boundary_nr_pages(dev, tbl->it_page_shift), + align_mask); + if (n == -1) { + if (likely(pass == 0)) { + /* First try the pool from the start */ + pool->hint = pool->start; + pass++; + goto again; + + } else if (pass <= tbl->nr_pools) { + /* Now try scanning all the other pools */ + spin_unlock(&(pool->lock)); + pool_nr = (pool_nr + 1) & (tbl->nr_pools - 1); + pool = &tbl->pools[pool_nr]; + spin_lock(&(pool->lock)); + pool->hint = pool->start; + pass++; + goto again; + + } else if (pass == tbl->nr_pools + 1) { + /* Last resort: try largepool */ + spin_unlock(&pool->lock); + pool = &tbl->large_pool; + spin_lock(&pool->lock); + pool->hint = pool->start; + pass++; + goto again; + + } else { + /* Give up */ + spin_unlock_irqrestore(&(pool->lock), flags); + return DMA_MAPPING_ERROR; + } + } + + end = n + npages; + + /* Bump the hint to a new block for small allocs. */ + if (largealloc) { + /* Don't bump to new block to avoid fragmentation */ + pool->hint = end; + } else { + /* Overflow will be taken care of at the next allocation */ + pool->hint = (end + tbl->it_blocksize - 1) & + ~(tbl->it_blocksize - 1); + } + + /* Update handle for SG allocations */ + if (handle) + *handle = end; + + spin_unlock_irqrestore(&(pool->lock), flags); + + return n; +} + +static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl, + void *page, unsigned int npages, + enum dma_data_direction direction, + unsigned long mask, unsigned int align_order, + unsigned long attrs) +{ + unsigned long entry; + dma_addr_t ret = DMA_MAPPING_ERROR; + int build_fail; + + entry = iommu_range_alloc(dev, tbl, npages, NULL, mask, align_order); + + if (unlikely(entry == DMA_MAPPING_ERROR)) + return DMA_MAPPING_ERROR; + + entry += tbl->it_offset; /* Offset into real TCE table */ + ret = entry << tbl->it_page_shift; /* Set the return dma address */ + + /* Put the TCEs in the HW table */ + build_fail = tbl->it_ops->set(tbl, entry, npages, + (unsigned long)page & + IOMMU_PAGE_MASK(tbl), direction, attrs); + + /* tbl->it_ops->set() only returns non-zero for transient errors. + * Clean up the table bitmap in this case and return + * DMA_MAPPING_ERROR. For all other errors the functionality is + * not altered. + */ + if (unlikely(build_fail)) { + __iommu_free(tbl, ret, npages); + return DMA_MAPPING_ERROR; + } + + /* Flush/invalidate TLB caches if necessary */ + if (tbl->it_ops->flush) + tbl->it_ops->flush(tbl); + + /* Make sure updates are seen by hardware */ + mb(); + + return ret; +} + +static bool iommu_free_check(struct iommu_table *tbl, dma_addr_t dma_addr, + unsigned int npages) +{ + unsigned long entry, free_entry; + + entry = dma_addr >> tbl->it_page_shift; + free_entry = entry - tbl->it_offset; + + if (((free_entry + npages) > tbl->it_size) || + (entry < tbl->it_offset)) { + if (printk_ratelimit()) { + printk(KERN_INFO "iommu_free: invalid entry\n"); + printk(KERN_INFO "\tentry = 0x%lx\n", entry); + printk(KERN_INFO "\tdma_addr = 0x%llx\n", (u64)dma_addr); + printk(KERN_INFO "\tTable = 0x%llx\n", (u64)tbl); + printk(KERN_INFO "\tbus# = 0x%llx\n", (u64)tbl->it_busno); + printk(KERN_INFO "\tsize = 0x%llx\n", (u64)tbl->it_size); + printk(KERN_INFO "\tstartOff = 0x%llx\n", (u64)tbl->it_offset); + printk(KERN_INFO "\tindex = 0x%llx\n", (u64)tbl->it_index); + WARN_ON(1); + } + + return false; + } + + return true; +} + +static struct iommu_pool *get_pool(struct iommu_table *tbl, + unsigned long entry) +{ + struct iommu_pool *p; + unsigned long largepool_start = tbl->large_pool.start; + + /* The large pool is the last pool at the top of the table */ + if (entry >= largepool_start) { + p = &tbl->large_pool; + } else { + unsigned int pool_nr = entry / tbl->poolsize; + + BUG_ON(pool_nr > tbl->nr_pools); + p = &tbl->pools[pool_nr]; + } + + return p; +} + +static void __iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr, + unsigned int npages) +{ + unsigned long entry, free_entry; + unsigned long flags; + struct iommu_pool *pool; + + entry = dma_addr >> tbl->it_page_shift; + free_entry = entry - tbl->it_offset; + + pool = get_pool(tbl, free_entry); + + if (!iommu_free_check(tbl, dma_addr, npages)) + return; + + tbl->it_ops->clear(tbl, entry, npages); + + spin_lock_irqsave(&(pool->lock), flags); + bitmap_clear(tbl->it_map, free_entry, npages); + spin_unlock_irqrestore(&(pool->lock), flags); +} + +static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr, + unsigned int npages) +{ + __iommu_free(tbl, dma_addr, npages); + + /* Make sure TLB cache is flushed if the HW needs it. We do + * not do an mb() here on purpose, it is not needed on any of + * the current platforms. + */ + if (tbl->it_ops->flush) + tbl->it_ops->flush(tbl); +} + +int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl, + struct scatterlist *sglist, int nelems, + unsigned long mask, enum dma_data_direction direction, + unsigned long attrs) +{ + dma_addr_t dma_next = 0, dma_addr; + struct scatterlist *s, *outs, *segstart; + int outcount, incount, i, build_fail = 0; + unsigned int align; + unsigned long handle; + unsigned int max_seg_size; + + BUG_ON(direction == DMA_NONE); + + if ((nelems == 0) || !tbl) + return -EINVAL; + + outs = s = segstart = &sglist[0]; + outcount = 1; + incount = nelems; + handle = 0; + + /* Init first segment length for backout at failure */ + outs->dma_length = 0; + + DBG("sg mapping %d elements:\n", nelems); + + max_seg_size = dma_get_max_seg_size(dev); + for_each_sg(sglist, s, nelems, i) { + unsigned long vaddr, npages, entry, slen; + + slen = s->length; + /* Sanity check */ + if (slen == 0) { + dma_next = 0; + continue; + } + /* Allocate iommu entries for that segment */ + vaddr = (unsigned long) sg_virt(s); + npages = iommu_num_pages(vaddr, slen, IOMMU_PAGE_SIZE(tbl)); + align = 0; + if (tbl->it_page_shift < PAGE_SHIFT && slen >= PAGE_SIZE && + (vaddr & ~PAGE_MASK) == 0) + align = PAGE_SHIFT - tbl->it_page_shift; + entry = iommu_range_alloc(dev, tbl, npages, &handle, + mask >> tbl->it_page_shift, align); + + DBG(" - vaddr: %lx, size: %lx\n", vaddr, slen); + + /* Handle failure */ + if (unlikely(entry == DMA_MAPPING_ERROR)) { + if (!(attrs & DMA_ATTR_NO_WARN) && + printk_ratelimit()) + dev_info(dev, "iommu_alloc failed, tbl %p " + "vaddr %lx npages %lu\n", tbl, vaddr, + npages); + goto failure; + } + + /* Convert entry to a dma_addr_t */ + entry += tbl->it_offset; + dma_addr = entry << tbl->it_page_shift; + dma_addr |= (vaddr & ~IOMMU_PAGE_MASK(tbl)); + + DBG(" - %lu pages, entry: %lx, dma_addr: %lx\n", + npages, entry, dma_addr); + + /* Insert into HW table */ + build_fail = tbl->it_ops->set(tbl, entry, npages, + vaddr & IOMMU_PAGE_MASK(tbl), + direction, attrs); + if(unlikely(build_fail)) + goto failure; + + /* If we are in an open segment, try merging */ + if (segstart != s) { + DBG(" - trying merge...\n"); + /* We cannot merge if: + * - allocated dma_addr isn't contiguous to previous allocation + */ + if (novmerge || (dma_addr != dma_next) || + (outs->dma_length + s->length > max_seg_size)) { + /* Can't merge: create a new segment */ + segstart = s; + outcount++; + outs = sg_next(outs); + DBG(" can't merge, new segment.\n"); + } else { + outs->dma_length += s->length; + DBG(" merged, new len: %ux\n", outs->dma_length); + } + } + + if (segstart == s) { + /* This is a new segment, fill entries */ + DBG(" - filling new segment.\n"); + outs->dma_address = dma_addr; + outs->dma_length = slen; + } + + /* Calculate next page pointer for contiguous check */ + dma_next = dma_addr + slen; + + DBG(" - dma next is: %lx\n", dma_next); + } + + /* Flush/invalidate TLB caches if necessary */ + if (tbl->it_ops->flush) + tbl->it_ops->flush(tbl); + + DBG("mapped %d elements:\n", outcount); + + /* For the sake of ppc_iommu_unmap_sg, we clear out the length in the + * next entry of the sglist if we didn't fill the list completely + */ + if (outcount < incount) { + outs = sg_next(outs); + outs->dma_length = 0; + } + + /* Make sure updates are seen by hardware */ + mb(); + + return outcount; + + failure: + for_each_sg(sglist, s, nelems, i) { + if (s->dma_length != 0) { + unsigned long vaddr, npages; + + vaddr = s->dma_address & IOMMU_PAGE_MASK(tbl); + npages = iommu_num_pages(s->dma_address, s->dma_length, + IOMMU_PAGE_SIZE(tbl)); + __iommu_free(tbl, vaddr, npages); + s->dma_length = 0; + } + if (s == outs) + break; + } + return -EIO; +} + + +void ppc_iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist, + int nelems, enum dma_data_direction direction, + unsigned long attrs) +{ + struct scatterlist *sg; + + BUG_ON(direction == DMA_NONE); + + if (!tbl) + return; + + sg = sglist; + while (nelems--) { + unsigned int npages; + dma_addr_t dma_handle = sg->dma_address; + + if (sg->dma_length == 0) + break; + npages = iommu_num_pages(dma_handle, sg->dma_length, + IOMMU_PAGE_SIZE(tbl)); + __iommu_free(tbl, dma_handle, npages); + sg = sg_next(sg); + } + + /* Flush/invalidate TLBs if necessary. As for iommu_free(), we + * do not do an mb() here, the affected platforms do not need it + * when freeing. + */ + if (tbl->it_ops->flush) + tbl->it_ops->flush(tbl); +} + +static void iommu_table_clear(struct iommu_table *tbl) +{ + /* + * In case of firmware assisted dump system goes through clean + * reboot process at the time of system crash. Hence it's safe to + * clear the TCE entries if firmware assisted dump is active. + */ + if (!is_kdump_kernel() || is_fadump_active()) { + /* Clear the table in case firmware left allocations in it */ + tbl->it_ops->clear(tbl, tbl->it_offset, tbl->it_size); + return; + } + +#ifdef CONFIG_CRASH_DUMP + if (tbl->it_ops->get) { + unsigned long index, tceval, tcecount = 0; + + /* Reserve the existing mappings left by the first kernel. */ + for (index = 0; index < tbl->it_size; index++) { + tceval = tbl->it_ops->get(tbl, index + tbl->it_offset); + /* + * Freed TCE entry contains 0x7fffffffffffffff on JS20 + */ + if (tceval && (tceval != 0x7fffffffffffffffUL)) { + __set_bit(index, tbl->it_map); + tcecount++; + } + } + + if ((tbl->it_size - tcecount) < KDUMP_MIN_TCE_ENTRIES) { + printk(KERN_WARNING "TCE table is full; freeing "); + printk(KERN_WARNING "%d entries for the kdump boot\n", + KDUMP_MIN_TCE_ENTRIES); + for (index = tbl->it_size - KDUMP_MIN_TCE_ENTRIES; + index < tbl->it_size; index++) + __clear_bit(index, tbl->it_map); + } + } +#endif +} + +static void iommu_table_reserve_pages(struct iommu_table *tbl, + unsigned long res_start, unsigned long res_end) +{ + int i; + + WARN_ON_ONCE(res_end < res_start); + /* + * Reserve page 0 so it will not be used for any mappings. + * This avoids buggy drivers that consider page 0 to be invalid + * to crash the machine or even lose data. + */ + if (tbl->it_offset == 0) + set_bit(0, tbl->it_map); + + if (res_start < tbl->it_offset) + res_start = tbl->it_offset; + + if (res_end > (tbl->it_offset + tbl->it_size)) + res_end = tbl->it_offset + tbl->it_size; + + /* Check if res_start..res_end is a valid range in the table */ + if (res_start >= res_end) { + tbl->it_reserved_start = tbl->it_offset; + tbl->it_reserved_end = tbl->it_offset; + return; + } + + tbl->it_reserved_start = res_start; + tbl->it_reserved_end = res_end; + + for (i = tbl->it_reserved_start; i < tbl->it_reserved_end; ++i) + set_bit(i - tbl->it_offset, tbl->it_map); +} + +/* + * Build a iommu_table structure. This contains a bit map which + * is used to manage allocation of the tce space. + */ +struct iommu_table *iommu_init_table(struct iommu_table *tbl, int nid, + unsigned long res_start, unsigned long res_end) +{ + unsigned long sz; + static int welcomed = 0; + unsigned int i; + struct iommu_pool *p; + + BUG_ON(!tbl->it_ops); + + /* number of bytes needed for the bitmap */ + sz = BITS_TO_LONGS(tbl->it_size) * sizeof(unsigned long); + + tbl->it_map = vzalloc_node(sz, nid); + if (!tbl->it_map) { + pr_err("%s: Can't allocate %ld bytes\n", __func__, sz); + return NULL; + } + + iommu_table_reserve_pages(tbl, res_start, res_end); + + /* We only split the IOMMU table if we have 1GB or more of space */ + if ((tbl->it_size << tbl->it_page_shift) >= (1UL * 1024 * 1024 * 1024)) + tbl->nr_pools = IOMMU_NR_POOLS; + else + tbl->nr_pools = 1; + + /* We reserve the top 1/4 of the table for large allocations */ + tbl->poolsize = (tbl->it_size * 3 / 4) / tbl->nr_pools; + + for (i = 0; i < tbl->nr_pools; i++) { + p = &tbl->pools[i]; + spin_lock_init(&(p->lock)); + p->start = tbl->poolsize * i; + p->hint = p->start; + p->end = p->start + tbl->poolsize; + } + + p = &tbl->large_pool; + spin_lock_init(&(p->lock)); + p->start = tbl->poolsize * i; + p->hint = p->start; + p->end = tbl->it_size; + + iommu_table_clear(tbl); + + if (!welcomed) { + printk(KERN_INFO "IOMMU table initialized, virtual merging %s\n", + novmerge ? "disabled" : "enabled"); + welcomed = 1; + } + + iommu_debugfs_add(tbl); + + return tbl; +} + +bool iommu_table_in_use(struct iommu_table *tbl) +{ + unsigned long start = 0, end; + + /* ignore reserved bit0 */ + if (tbl->it_offset == 0) + start = 1; + + /* Simple case with no reserved MMIO32 region */ + if (!tbl->it_reserved_start && !tbl->it_reserved_end) + return find_next_bit(tbl->it_map, tbl->it_size, start) != tbl->it_size; + + end = tbl->it_reserved_start - tbl->it_offset; + if (find_next_bit(tbl->it_map, end, start) != end) + return true; + + start = tbl->it_reserved_end - tbl->it_offset; + end = tbl->it_size; + return find_next_bit(tbl->it_map, end, start) != end; +} + +static void iommu_table_free(struct kref *kref) +{ + struct iommu_table *tbl; + + tbl = container_of(kref, struct iommu_table, it_kref); + + if (tbl->it_ops->free) + tbl->it_ops->free(tbl); + + if (!tbl->it_map) { + kfree(tbl); + return; + } + + iommu_debugfs_del(tbl); + + /* verify that table contains no entries */ + if (iommu_table_in_use(tbl)) + pr_warn("%s: Unexpected TCEs\n", __func__); + + /* free bitmap */ + vfree(tbl->it_map); + + /* free table */ + kfree(tbl); +} + +struct iommu_table *iommu_tce_table_get(struct iommu_table *tbl) +{ + if (kref_get_unless_zero(&tbl->it_kref)) + return tbl; + + return NULL; +} +EXPORT_SYMBOL_GPL(iommu_tce_table_get); + +int iommu_tce_table_put(struct iommu_table *tbl) +{ + if (WARN_ON(!tbl)) + return 0; + + return kref_put(&tbl->it_kref, iommu_table_free); +} +EXPORT_SYMBOL_GPL(iommu_tce_table_put); + +/* Creates TCEs for a user provided buffer. The user buffer must be + * contiguous real kernel storage (not vmalloc). The address passed here + * comprises a page address and offset into that page. The dma_addr_t + * returned will point to the same byte within the page as was passed in. + */ +dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl, + struct page *page, unsigned long offset, size_t size, + unsigned long mask, enum dma_data_direction direction, + unsigned long attrs) +{ + dma_addr_t dma_handle = DMA_MAPPING_ERROR; + void *vaddr; + unsigned long uaddr; + unsigned int npages, align; + + BUG_ON(direction == DMA_NONE); + + vaddr = page_address(page) + offset; + uaddr = (unsigned long)vaddr; + + if (tbl) { + npages = iommu_num_pages(uaddr, size, IOMMU_PAGE_SIZE(tbl)); + align = 0; + if (tbl->it_page_shift < PAGE_SHIFT && size >= PAGE_SIZE && + ((unsigned long)vaddr & ~PAGE_MASK) == 0) + align = PAGE_SHIFT - tbl->it_page_shift; + + dma_handle = iommu_alloc(dev, tbl, vaddr, npages, direction, + mask >> tbl->it_page_shift, align, + attrs); + if (dma_handle == DMA_MAPPING_ERROR) { + if (!(attrs & DMA_ATTR_NO_WARN) && + printk_ratelimit()) { + dev_info(dev, "iommu_alloc failed, tbl %p " + "vaddr %p npages %d\n", tbl, vaddr, + npages); + } + } else + dma_handle |= (uaddr & ~IOMMU_PAGE_MASK(tbl)); + } + + return dma_handle; +} + +void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle, + size_t size, enum dma_data_direction direction, + unsigned long attrs) +{ + unsigned int npages; + + BUG_ON(direction == DMA_NONE); + + if (tbl) { + npages = iommu_num_pages(dma_handle, size, + IOMMU_PAGE_SIZE(tbl)); + iommu_free(tbl, dma_handle, npages); + } +} + +/* Allocates a contiguous real buffer and creates mappings over it. + * Returns the virtual address of the buffer and sets dma_handle + * to the dma address (mapping) of the first page. + */ +void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl, + size_t size, dma_addr_t *dma_handle, + unsigned long mask, gfp_t flag, int node) +{ + void *ret = NULL; + dma_addr_t mapping; + unsigned int order; + unsigned int nio_pages, io_order; + struct page *page; + int tcesize = (1 << tbl->it_page_shift); + + size = PAGE_ALIGN(size); + order = get_order(size); + + /* + * Client asked for way too much space. This is checked later + * anyway. It is easier to debug here for the drivers than in + * the tce tables. + */ + if (order >= IOMAP_MAX_ORDER) { + dev_info(dev, "iommu_alloc_consistent size too large: 0x%lx\n", + size); + return NULL; + } + + if (!tbl) + return NULL; + + /* Alloc enough pages (and possibly more) */ + page = alloc_pages_node(node, flag, order); + if (!page) + return NULL; + ret = page_address(page); + memset(ret, 0, size); + + /* Set up tces to cover the allocated range */ + nio_pages = IOMMU_PAGE_ALIGN(size, tbl) >> tbl->it_page_shift; + + io_order = get_iommu_order(size, tbl); + mapping = iommu_alloc(dev, tbl, ret, nio_pages, DMA_BIDIRECTIONAL, + mask >> tbl->it_page_shift, io_order, 0); + if (mapping == DMA_MAPPING_ERROR) { + free_pages((unsigned long)ret, order); + return NULL; + } + + *dma_handle = mapping | ((u64)ret & (tcesize - 1)); + return ret; +} + +void iommu_free_coherent(struct iommu_table *tbl, size_t size, + void *vaddr, dma_addr_t dma_handle) +{ + if (tbl) { + unsigned int nio_pages; + + size = PAGE_ALIGN(size); + nio_pages = IOMMU_PAGE_ALIGN(size, tbl) >> tbl->it_page_shift; + iommu_free(tbl, dma_handle, nio_pages); + size = PAGE_ALIGN(size); + free_pages((unsigned long)vaddr, get_order(size)); + } +} + +unsigned long iommu_direction_to_tce_perm(enum dma_data_direction dir) +{ + switch (dir) { + case DMA_BIDIRECTIONAL: + return TCE_PCI_READ | TCE_PCI_WRITE; + case DMA_FROM_DEVICE: + return TCE_PCI_WRITE; + case DMA_TO_DEVICE: + return TCE_PCI_READ; + default: + return 0; + } +} +EXPORT_SYMBOL_GPL(iommu_direction_to_tce_perm); + +#ifdef CONFIG_IOMMU_API +/* + * SPAPR TCE API + */ +static void group_release(void *iommu_data) +{ + struct iommu_table_group *table_group = iommu_data; + + table_group->group = NULL; +} + +void iommu_register_group(struct iommu_table_group *table_group, + int pci_domain_number, unsigned long pe_num) +{ + struct iommu_group *grp; + char *name; + + grp = iommu_group_alloc(); + if (IS_ERR(grp)) { + pr_warn("powerpc iommu api: cannot create new group, err=%ld\n", + PTR_ERR(grp)); + return; + } + table_group->group = grp; + iommu_group_set_iommudata(grp, table_group, group_release); + name = kasprintf(GFP_KERNEL, "domain%d-pe%lx", + pci_domain_number, pe_num); + if (!name) + return; + iommu_group_set_name(grp, name); + kfree(name); +} + +enum dma_data_direction iommu_tce_direction(unsigned long tce) +{ + if ((tce & TCE_PCI_READ) && (tce & TCE_PCI_WRITE)) + return DMA_BIDIRECTIONAL; + else if (tce & TCE_PCI_READ) + return DMA_TO_DEVICE; + else if (tce & TCE_PCI_WRITE) + return DMA_FROM_DEVICE; + else + return DMA_NONE; +} +EXPORT_SYMBOL_GPL(iommu_tce_direction); + +void iommu_flush_tce(struct iommu_table *tbl) +{ + /* Flush/invalidate TLB caches if necessary */ + if (tbl->it_ops->flush) + tbl->it_ops->flush(tbl); + + /* Make sure updates are seen by hardware */ + mb(); +} +EXPORT_SYMBOL_GPL(iommu_flush_tce); + +int iommu_tce_check_ioba(unsigned long page_shift, + unsigned long offset, unsigned long size, + unsigned long ioba, unsigned long npages) +{ + unsigned long mask = (1UL << page_shift) - 1; + + if (ioba & mask) + return -EINVAL; + + ioba >>= page_shift; + if (ioba < offset) + return -EINVAL; + + if ((ioba + 1) > (offset + size)) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL_GPL(iommu_tce_check_ioba); + +int iommu_tce_check_gpa(unsigned long page_shift, unsigned long gpa) +{ + unsigned long mask = (1UL << page_shift) - 1; + + if (gpa & mask) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL_GPL(iommu_tce_check_gpa); + +extern long iommu_tce_xchg_no_kill(struct mm_struct *mm, + struct iommu_table *tbl, + unsigned long entry, unsigned long *hpa, + enum dma_data_direction *direction) +{ + long ret; + unsigned long size = 0; + + ret = tbl->it_ops->xchg_no_kill(tbl, entry, hpa, direction); + if (!ret && ((*direction == DMA_FROM_DEVICE) || + (*direction == DMA_BIDIRECTIONAL)) && + !mm_iommu_is_devmem(mm, *hpa, tbl->it_page_shift, + &size)) + SetPageDirty(pfn_to_page(*hpa >> PAGE_SHIFT)); + + return ret; +} +EXPORT_SYMBOL_GPL(iommu_tce_xchg_no_kill); + +void iommu_tce_kill(struct iommu_table *tbl, + unsigned long entry, unsigned long pages) +{ + if (tbl->it_ops->tce_kill) + tbl->it_ops->tce_kill(tbl, entry, pages); +} +EXPORT_SYMBOL_GPL(iommu_tce_kill); + +int iommu_take_ownership(struct iommu_table *tbl) +{ + unsigned long flags, i, sz = (tbl->it_size + 7) >> 3; + int ret = 0; + + /* + * VFIO does not control TCE entries allocation and the guest + * can write new TCEs on top of existing ones so iommu_tce_build() + * must be able to release old pages. This functionality + * requires exchange() callback defined so if it is not + * implemented, we disallow taking ownership over the table. + */ + if (!tbl->it_ops->xchg_no_kill) + return -EINVAL; + + spin_lock_irqsave(&tbl->large_pool.lock, flags); + for (i = 0; i < tbl->nr_pools; i++) + spin_lock_nest_lock(&tbl->pools[i].lock, &tbl->large_pool.lock); + + if (iommu_table_in_use(tbl)) { + pr_err("iommu_tce: it_map is not empty"); + ret = -EBUSY; + } else { + memset(tbl->it_map, 0xff, sz); + } + + for (i = 0; i < tbl->nr_pools; i++) + spin_unlock(&tbl->pools[i].lock); + spin_unlock_irqrestore(&tbl->large_pool.lock, flags); + + return ret; +} +EXPORT_SYMBOL_GPL(iommu_take_ownership); + +void iommu_release_ownership(struct iommu_table *tbl) +{ + unsigned long flags, i, sz = (tbl->it_size + 7) >> 3; + + spin_lock_irqsave(&tbl->large_pool.lock, flags); + for (i = 0; i < tbl->nr_pools; i++) + spin_lock_nest_lock(&tbl->pools[i].lock, &tbl->large_pool.lock); + + memset(tbl->it_map, 0, sz); + + iommu_table_reserve_pages(tbl, tbl->it_reserved_start, + tbl->it_reserved_end); + + for (i = 0; i < tbl->nr_pools; i++) + spin_unlock(&tbl->pools[i].lock); + spin_unlock_irqrestore(&tbl->large_pool.lock, flags); +} +EXPORT_SYMBOL_GPL(iommu_release_ownership); + +int iommu_add_device(struct iommu_table_group *table_group, struct device *dev) +{ + /* + * The sysfs entries should be populated before + * binding IOMMU group. If sysfs entries isn't + * ready, we simply bail. + */ + if (!device_is_registered(dev)) + return -ENOENT; + + if (device_iommu_mapped(dev)) { + pr_debug("%s: Skipping device %s with iommu group %d\n", + __func__, dev_name(dev), + iommu_group_id(dev->iommu_group)); + return -EBUSY; + } + + pr_debug("%s: Adding %s to iommu group %d\n", + __func__, dev_name(dev), iommu_group_id(table_group->group)); + + return iommu_group_add_device(table_group->group, dev); +} +EXPORT_SYMBOL_GPL(iommu_add_device); + +void iommu_del_device(struct device *dev) +{ + /* + * Some devices might not have IOMMU table and group + * and we needn't detach them from the associated + * IOMMU groups + */ + if (!device_iommu_mapped(dev)) { + pr_debug("iommu_tce: skipping device %s with no tbl\n", + dev_name(dev)); + return; + } + + iommu_group_remove_device(dev); +} +EXPORT_SYMBOL_GPL(iommu_del_device); +#endif /* CONFIG_IOMMU_API */ diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c new file mode 100644 index 000000000..55142ff64 --- /dev/null +++ b/arch/powerpc/kernel/irq.c @@ -0,0 +1,386 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Derived from arch/i386/kernel/irq.c + * Copyright (C) 1992 Linus Torvalds + * Adapted from arch/i386 by Gary Thomas + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * Updated and modified by Cort Dougan <cort@fsmlabs.com> + * Copyright (C) 1996-2001 Cort Dougan + * Adapted for Power Macintosh by Paul Mackerras + * Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au) + * + * This file contains the code used by various IRQ handling routines: + * asking for different IRQ's should be done through these routines + * instead of just grabbing them. Thus setups with different IRQ numbers + * shouldn't result in any weird surprises, and installing new handlers + * should be easier. + * + * The MPC8xx has an interrupt mask in the SIU. If a bit is set, the + * interrupt is _enabled_. As expected, IRQ0 is bit 0 in the 32-bit + * mask register (of which only 16 are defined), hence the weird shifting + * and complement of the cached_irq_mask. I want to be able to stuff + * this right into the SIU SMASK register. + * Many of the prep/chrp functions are conditional compiled on CONFIG_PPC_8xx + * to reduce code space and undefined function references. + */ + +#undef DEBUG + +#include <linux/export.h> +#include <linux/threads.h> +#include <linux/kernel_stat.h> +#include <linux/signal.h> +#include <linux/sched.h> +#include <linux/ptrace.h> +#include <linux/ioport.h> +#include <linux/interrupt.h> +#include <linux/timex.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/irq.h> +#include <linux/seq_file.h> +#include <linux/cpumask.h> +#include <linux/profile.h> +#include <linux/bitops.h> +#include <linux/list.h> +#include <linux/radix-tree.h> +#include <linux/mutex.h> +#include <linux/pci.h> +#include <linux/debugfs.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/vmalloc.h> +#include <linux/pgtable.h> +#include <linux/static_call.h> + +#include <linux/uaccess.h> +#include <asm/interrupt.h> +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/cache.h> +#include <asm/ptrace.h> +#include <asm/machdep.h> +#include <asm/udbg.h> +#include <asm/smp.h> +#include <asm/hw_irq.h> +#include <asm/softirq_stack.h> +#include <asm/ppc_asm.h> + +#define CREATE_TRACE_POINTS +#include <asm/trace.h> +#include <asm/cpu_has_feature.h> + +DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat); +EXPORT_PER_CPU_SYMBOL(irq_stat); + +#ifdef CONFIG_PPC32 +atomic_t ppc_n_lost_interrupts; + +#ifdef CONFIG_TAU_INT +extern int tau_initialized; +u32 tau_interrupts(unsigned long cpu); +#endif +#endif /* CONFIG_PPC32 */ + +int arch_show_interrupts(struct seq_file *p, int prec) +{ + int j; + +#if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT) + if (tau_initialized) { + seq_printf(p, "%*s: ", prec, "TAU"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", tau_interrupts(j)); + seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n"); + } +#endif /* CONFIG_PPC32 && CONFIG_TAU_INT */ + + seq_printf(p, "%*s: ", prec, "LOC"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(irq_stat, j).timer_irqs_event); + seq_printf(p, " Local timer interrupts for timer event device\n"); + + seq_printf(p, "%*s: ", prec, "BCT"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(irq_stat, j).broadcast_irqs_event); + seq_printf(p, " Broadcast timer interrupts for timer event device\n"); + + seq_printf(p, "%*s: ", prec, "LOC"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(irq_stat, j).timer_irqs_others); + seq_printf(p, " Local timer interrupts for others\n"); + + seq_printf(p, "%*s: ", prec, "SPU"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(irq_stat, j).spurious_irqs); + seq_printf(p, " Spurious interrupts\n"); + + seq_printf(p, "%*s: ", prec, "PMI"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(irq_stat, j).pmu_irqs); + seq_printf(p, " Performance monitoring interrupts\n"); + + seq_printf(p, "%*s: ", prec, "MCE"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(irq_stat, j).mce_exceptions); + seq_printf(p, " Machine check exceptions\n"); + +#ifdef CONFIG_PPC_BOOK3S_64 + if (cpu_has_feature(CPU_FTR_HVMODE)) { + seq_printf(p, "%*s: ", prec, "HMI"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", paca_ptrs[j]->hmi_irqs); + seq_printf(p, " Hypervisor Maintenance Interrupts\n"); + } +#endif + + seq_printf(p, "%*s: ", prec, "NMI"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(irq_stat, j).sreset_irqs); + seq_printf(p, " System Reset interrupts\n"); + +#ifdef CONFIG_PPC_WATCHDOG + seq_printf(p, "%*s: ", prec, "WDG"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(irq_stat, j).soft_nmi_irqs); + seq_printf(p, " Watchdog soft-NMI interrupts\n"); +#endif + +#ifdef CONFIG_PPC_DOORBELL + if (cpu_has_feature(CPU_FTR_DBELL)) { + seq_printf(p, "%*s: ", prec, "DBL"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(irq_stat, j).doorbell_irqs); + seq_printf(p, " Doorbell interrupts\n"); + } +#endif + + return 0; +} + +/* + * /proc/stat helpers + */ +u64 arch_irq_stat_cpu(unsigned int cpu) +{ + u64 sum = per_cpu(irq_stat, cpu).timer_irqs_event; + + sum += per_cpu(irq_stat, cpu).broadcast_irqs_event; + sum += per_cpu(irq_stat, cpu).pmu_irqs; + sum += per_cpu(irq_stat, cpu).mce_exceptions; + sum += per_cpu(irq_stat, cpu).spurious_irqs; + sum += per_cpu(irq_stat, cpu).timer_irqs_others; +#ifdef CONFIG_PPC_BOOK3S_64 + sum += paca_ptrs[cpu]->hmi_irqs; +#endif + sum += per_cpu(irq_stat, cpu).sreset_irqs; +#ifdef CONFIG_PPC_WATCHDOG + sum += per_cpu(irq_stat, cpu).soft_nmi_irqs; +#endif +#ifdef CONFIG_PPC_DOORBELL + sum += per_cpu(irq_stat, cpu).doorbell_irqs; +#endif + + return sum; +} + +static inline void check_stack_overflow(unsigned long sp) +{ + if (!IS_ENABLED(CONFIG_DEBUG_STACKOVERFLOW)) + return; + + sp &= THREAD_SIZE - 1; + + /* check for stack overflow: is there less than 1/4th free? */ + if (unlikely(sp < THREAD_SIZE / 4)) { + pr_err("do_IRQ: stack overflow: %ld\n", sp); + dump_stack(); + } +} + +#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK +static __always_inline void call_do_softirq(const void *sp) +{ + /* Temporarily switch r1 to sp, call __do_softirq() then restore r1. */ + asm volatile ( + PPC_STLU " %%r1, %[offset](%[sp]) ;" + "mr %%r1, %[sp] ;" + "bl %[callee] ;" + PPC_LL " %%r1, 0(%%r1) ;" + : // Outputs + : // Inputs + [sp] "b" (sp), [offset] "i" (THREAD_SIZE - STACK_FRAME_OVERHEAD), + [callee] "i" (__do_softirq) + : // Clobbers + "lr", "xer", "ctr", "memory", "cr0", "cr1", "cr5", "cr6", + "cr7", "r0", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", + "r11", "r12" + ); +} +#endif + +DEFINE_STATIC_CALL_RET0(ppc_get_irq, *ppc_md.get_irq); + +static void __do_irq(struct pt_regs *regs, unsigned long oldsp) +{ + unsigned int irq; + + trace_irq_entry(regs); + + check_stack_overflow(oldsp); + + /* + * Query the platform PIC for the interrupt & ack it. + * + * This will typically lower the interrupt line to the CPU + */ + irq = static_call(ppc_get_irq)(); + + /* We can hard enable interrupts now to allow perf interrupts */ + if (should_hard_irq_enable(regs)) + do_hard_irq_enable(); + + /* And finally process it */ + if (unlikely(!irq)) + __this_cpu_inc(irq_stat.spurious_irqs); + else + generic_handle_irq(irq); + + trace_irq_exit(regs); +} + +static __always_inline void call_do_irq(struct pt_regs *regs, void *sp) +{ + register unsigned long r3 asm("r3") = (unsigned long)regs; + + /* Temporarily switch r1 to sp, call __do_irq() then restore r1. */ + asm volatile ( + PPC_STLU " %%r1, %[offset](%[sp]) ;" + "mr %%r4, %%r1 ;" + "mr %%r1, %[sp] ;" + "bl %[callee] ;" + PPC_LL " %%r1, 0(%%r1) ;" + : // Outputs + "+r" (r3) + : // Inputs + [sp] "b" (sp), [offset] "i" (THREAD_SIZE - STACK_FRAME_OVERHEAD), + [callee] "i" (__do_irq) + : // Clobbers + "lr", "xer", "ctr", "memory", "cr0", "cr1", "cr5", "cr6", + "cr7", "r0", "r4", "r5", "r6", "r7", "r8", "r9", "r10", + "r11", "r12" + ); +} + +void __do_IRQ(struct pt_regs *regs) +{ + struct pt_regs *old_regs = set_irq_regs(regs); + void *cursp, *irqsp, *sirqsp; + + /* Switch to the irq stack to handle this */ + cursp = (void *)(current_stack_pointer & ~(THREAD_SIZE - 1)); + irqsp = hardirq_ctx[raw_smp_processor_id()]; + sirqsp = softirq_ctx[raw_smp_processor_id()]; + + /* Already there ? If not switch stack and call */ + if (unlikely(cursp == irqsp || cursp == sirqsp)) + __do_irq(regs, current_stack_pointer); + else + call_do_irq(regs, irqsp); + + set_irq_regs(old_regs); +} + +DEFINE_INTERRUPT_HANDLER_ASYNC(do_IRQ) +{ + __do_IRQ(regs); +} + +static void *__init alloc_vm_stack(void) +{ + return __vmalloc_node(THREAD_SIZE, THREAD_ALIGN, THREADINFO_GFP, + NUMA_NO_NODE, (void *)_RET_IP_); +} + +static void __init vmap_irqstack_init(void) +{ + int i; + + for_each_possible_cpu(i) { + softirq_ctx[i] = alloc_vm_stack(); + hardirq_ctx[i] = alloc_vm_stack(); + } +} + + +void __init init_IRQ(void) +{ + if (IS_ENABLED(CONFIG_VMAP_STACK)) + vmap_irqstack_init(); + + if (ppc_md.init_IRQ) + ppc_md.init_IRQ(); + + if (!WARN_ON(!ppc_md.get_irq)) + static_call_update(ppc_get_irq, ppc_md.get_irq); +} + +#ifdef CONFIG_BOOKE_OR_40x +void *critirq_ctx[NR_CPUS] __read_mostly; +void *dbgirq_ctx[NR_CPUS] __read_mostly; +void *mcheckirq_ctx[NR_CPUS] __read_mostly; +#endif + +void *softirq_ctx[NR_CPUS] __read_mostly; +void *hardirq_ctx[NR_CPUS] __read_mostly; + +#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK +void do_softirq_own_stack(void) +{ + call_do_softirq(softirq_ctx[smp_processor_id()]); +} +#endif + +irq_hw_number_t virq_to_hw(unsigned int virq) +{ + struct irq_data *irq_data = irq_get_irq_data(virq); + return WARN_ON(!irq_data) ? 0 : irq_data->hwirq; +} +EXPORT_SYMBOL_GPL(virq_to_hw); + +#ifdef CONFIG_SMP +int irq_choose_cpu(const struct cpumask *mask) +{ + int cpuid; + + if (cpumask_equal(mask, cpu_online_mask)) { + static int irq_rover; + static DEFINE_RAW_SPINLOCK(irq_rover_lock); + unsigned long flags; + + /* Round-robin distribution... */ +do_round_robin: + raw_spin_lock_irqsave(&irq_rover_lock, flags); + + irq_rover = cpumask_next(irq_rover, cpu_online_mask); + if (irq_rover >= nr_cpu_ids) + irq_rover = cpumask_first(cpu_online_mask); + + cpuid = irq_rover; + + raw_spin_unlock_irqrestore(&irq_rover_lock, flags); + } else { + cpuid = cpumask_first_and(mask, cpu_online_mask); + if (cpuid >= nr_cpu_ids) + goto do_round_robin; + } + + return get_hard_smp_processor_id(cpuid); +} +#else +int irq_choose_cpu(const struct cpumask *mask) +{ + return hard_smp_processor_id(); +} +#endif diff --git a/arch/powerpc/kernel/irq_64.c b/arch/powerpc/kernel/irq_64.c new file mode 100644 index 000000000..9dc0ad3c5 --- /dev/null +++ b/arch/powerpc/kernel/irq_64.c @@ -0,0 +1,526 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Derived from arch/i386/kernel/irq.c + * Copyright (C) 1992 Linus Torvalds + * Adapted from arch/i386 by Gary Thomas + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * Updated and modified by Cort Dougan <cort@fsmlabs.com> + * Copyright (C) 1996-2001 Cort Dougan + * Adapted for Power Macintosh by Paul Mackerras + * Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au) + * + * This file contains the code used by various IRQ handling routines: + * asking for different IRQ's should be done through these routines + * instead of just grabbing them. Thus setups with different IRQ numbers + * shouldn't result in any weird surprises, and installing new handlers + * should be easier. + */ + +#undef DEBUG + +#include <linux/export.h> +#include <linux/threads.h> +#include <linux/kernel_stat.h> +#include <linux/signal.h> +#include <linux/sched.h> +#include <linux/ptrace.h> +#include <linux/ioport.h> +#include <linux/interrupt.h> +#include <linux/timex.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/irq.h> +#include <linux/seq_file.h> +#include <linux/cpumask.h> +#include <linux/profile.h> +#include <linux/bitops.h> +#include <linux/list.h> +#include <linux/radix-tree.h> +#include <linux/mutex.h> +#include <linux/pci.h> +#include <linux/debugfs.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/vmalloc.h> +#include <linux/pgtable.h> +#include <linux/static_call.h> + +#include <linux/uaccess.h> +#include <asm/interrupt.h> +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/cache.h> +#include <asm/ptrace.h> +#include <asm/machdep.h> +#include <asm/udbg.h> +#include <asm/smp.h> +#include <asm/hw_irq.h> +#include <asm/softirq_stack.h> +#include <asm/ppc_asm.h> + +#include <asm/paca.h> +#include <asm/firmware.h> +#include <asm/lv1call.h> +#include <asm/dbell.h> +#include <asm/trace.h> +#include <asm/cpu_has_feature.h> + +int distribute_irqs = 1; + +static inline void next_interrupt(struct pt_regs *regs) +{ + if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) { + WARN_ON(!(local_paca->irq_happened & PACA_IRQ_HARD_DIS)); + WARN_ON(irq_soft_mask_return() != IRQS_ALL_DISABLED); + } + + /* + * We are responding to the next interrupt, so interrupt-off + * latencies should be reset here. + */ + lockdep_hardirq_exit(); + trace_hardirqs_on(); + trace_hardirqs_off(); + lockdep_hardirq_enter(); +} + +static inline bool irq_happened_test_and_clear(u8 irq) +{ + if (local_paca->irq_happened & irq) { + local_paca->irq_happened &= ~irq; + return true; + } + return false; +} + +static void __replay_soft_interrupts(void) +{ + struct pt_regs regs; + + /* + * We use local_paca rather than get_paca() to avoid all the + * debug_smp_processor_id() business in this low level function. + */ + + if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) { + WARN_ON_ONCE(mfmsr() & MSR_EE); + WARN_ON(!(local_paca->irq_happened & PACA_IRQ_HARD_DIS)); + WARN_ON(local_paca->irq_happened & PACA_IRQ_REPLAYING); + } + + /* + * PACA_IRQ_REPLAYING prevents interrupt handlers from enabling + * MSR[EE] to get PMIs, which can result in more IRQs becoming + * pending. + */ + local_paca->irq_happened |= PACA_IRQ_REPLAYING; + + ppc_save_regs(®s); + regs.softe = IRQS_ENABLED; + regs.msr |= MSR_EE; + + /* + * Force the delivery of pending soft-disabled interrupts on PS3. + * Any HV call will have this side effect. + */ + if (firmware_has_feature(FW_FEATURE_PS3_LV1)) { + u64 tmp, tmp2; + lv1_get_version_info(&tmp, &tmp2); + } + + /* + * Check if an hypervisor Maintenance interrupt happened. + * This is a higher priority interrupt than the others, so + * replay it first. + */ + if (IS_ENABLED(CONFIG_PPC_BOOK3S) && + irq_happened_test_and_clear(PACA_IRQ_HMI)) { + regs.trap = INTERRUPT_HMI; + handle_hmi_exception(®s); + next_interrupt(®s); + } + + if (irq_happened_test_and_clear(PACA_IRQ_DEC)) { + regs.trap = INTERRUPT_DECREMENTER; + timer_interrupt(®s); + next_interrupt(®s); + } + + if (irq_happened_test_and_clear(PACA_IRQ_EE)) { + regs.trap = INTERRUPT_EXTERNAL; + do_IRQ(®s); + next_interrupt(®s); + } + + if (IS_ENABLED(CONFIG_PPC_DOORBELL) && + irq_happened_test_and_clear(PACA_IRQ_DBELL)) { + regs.trap = INTERRUPT_DOORBELL; + doorbell_exception(®s); + next_interrupt(®s); + } + + /* Book3E does not support soft-masking PMI interrupts */ + if (IS_ENABLED(CONFIG_PPC_BOOK3S) && + irq_happened_test_and_clear(PACA_IRQ_PMI)) { + regs.trap = INTERRUPT_PERFMON; + performance_monitor_exception(®s); + next_interrupt(®s); + } + + local_paca->irq_happened &= ~PACA_IRQ_REPLAYING; +} + +void replay_soft_interrupts(void) +{ + irq_enter(); /* See comment in arch_local_irq_restore */ + __replay_soft_interrupts(); + irq_exit(); +} + +#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_PPC_KUAP) +static inline void replay_soft_interrupts_irqrestore(void) +{ + unsigned long kuap_state = get_kuap(); + + /* + * Check if anything calls local_irq_enable/restore() when KUAP is + * disabled (user access enabled). We handle that case here by saving + * and re-locking AMR but we shouldn't get here in the first place, + * hence the warning. + */ + kuap_assert_locked(); + + if (kuap_state != AMR_KUAP_BLOCKED) + set_kuap(AMR_KUAP_BLOCKED); + + __replay_soft_interrupts(); + + if (kuap_state != AMR_KUAP_BLOCKED) + set_kuap(kuap_state); +} +#else +#define replay_soft_interrupts_irqrestore() __replay_soft_interrupts() +#endif + +notrace void arch_local_irq_restore(unsigned long mask) +{ + unsigned char irq_happened; + + /* Write the new soft-enabled value if it is a disable */ + if (mask) { + irq_soft_mask_set(mask); + return; + } + + if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) { + WARN_ON_ONCE(in_nmi()); + WARN_ON_ONCE(in_hardirq()); + WARN_ON_ONCE(local_paca->irq_happened & PACA_IRQ_REPLAYING); + } + +again: + /* + * After the stb, interrupts are unmasked and there are no interrupts + * pending replay. The restart sequence makes this atomic with + * respect to soft-masked interrupts. If this was just a simple code + * sequence, a soft-masked interrupt could become pending right after + * the comparison and before the stb. + * + * This allows interrupts to be unmasked without hard disabling, and + * also without new hard interrupts coming in ahead of pending ones. + */ + asm_volatile_goto( +"1: \n" +" lbz 9,%0(13) \n" +" cmpwi 9,0 \n" +" bne %l[happened] \n" +" stb 9,%1(13) \n" +"2: \n" + RESTART_TABLE(1b, 2b, 1b) + : : "i" (offsetof(struct paca_struct, irq_happened)), + "i" (offsetof(struct paca_struct, irq_soft_mask)) + : "cr0", "r9" + : happened); + + if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) + WARN_ON_ONCE(!(mfmsr() & MSR_EE)); + + /* + * If we came here from the replay below, we might have a preempt + * pending (due to preempt_enable_no_resched()). Have to check now. + */ + preempt_check_resched(); + + return; + +happened: + irq_happened = READ_ONCE(local_paca->irq_happened); + if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) + WARN_ON_ONCE(!irq_happened); + + if (irq_happened == PACA_IRQ_HARD_DIS) { + if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) + WARN_ON_ONCE(mfmsr() & MSR_EE); + irq_soft_mask_set(IRQS_ENABLED); + local_paca->irq_happened = 0; + __hard_irq_enable(); + preempt_check_resched(); + return; + } + + /* Have interrupts to replay, need to hard disable first */ + if (!(irq_happened & PACA_IRQ_HARD_DIS)) { + if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) { + if (!(mfmsr() & MSR_EE)) { + /* + * An interrupt could have come in and cleared + * MSR[EE] and set IRQ_HARD_DIS, so check + * IRQ_HARD_DIS again and warn if it is still + * clear. + */ + irq_happened = READ_ONCE(local_paca->irq_happened); + WARN_ON_ONCE(!(irq_happened & PACA_IRQ_HARD_DIS)); + } + } + __hard_irq_disable(); + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + } else { + if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) { + if (WARN_ON_ONCE(mfmsr() & MSR_EE)) + __hard_irq_disable(); + } + } + + /* + * Disable preempt here, so that the below preempt_enable will + * perform resched if required (a replayed interrupt may set + * need_resched). + */ + preempt_disable(); + irq_soft_mask_set(IRQS_ALL_DISABLED); + trace_hardirqs_off(); + + /* + * Now enter interrupt context. The interrupt handlers themselves + * also call irq_enter/exit (which is okay, they can nest). But call + * it here now to hold off softirqs until the below irq_exit(). If + * we allowed replayed handlers to run softirqs, that enables irqs, + * which must replay interrupts, which recurses in here and makes + * things more complicated. The recursion is limited to 2, and it can + * be made to work, but it's complicated. + * + * local_bh_disable can not be used here because interrupts taken in + * idle are not in the right context (RCU, tick, etc) to run softirqs + * so irq_enter must be called. + */ + irq_enter(); + + replay_soft_interrupts_irqrestore(); + + irq_exit(); + + if (unlikely(local_paca->irq_happened != PACA_IRQ_HARD_DIS)) { + /* + * The softirq processing in irq_exit() may enable interrupts + * temporarily, which can result in MSR[EE] being enabled and + * more irqs becoming pending. Go around again if that happens. + */ + trace_hardirqs_on(); + preempt_enable_no_resched(); + goto again; + } + + trace_hardirqs_on(); + irq_soft_mask_set(IRQS_ENABLED); + local_paca->irq_happened = 0; + __hard_irq_enable(); + preempt_enable(); +} +EXPORT_SYMBOL(arch_local_irq_restore); + +/* + * This is a helper to use when about to go into idle low-power + * when the latter has the side effect of re-enabling interrupts + * (such as calling H_CEDE under pHyp). + * + * You call this function with interrupts soft-disabled (this is + * already the case when ppc_md.power_save is called). The function + * will return whether to enter power save or just return. + * + * In the former case, it will have notified lockdep of interrupts + * being re-enabled and generally sanitized the lazy irq state, + * and in the latter case it will leave with interrupts hard + * disabled and marked as such, so the local_irq_enable() call + * in arch_cpu_idle() will properly re-enable everything. + */ +bool prep_irq_for_idle(void) +{ + /* + * First we need to hard disable to ensure no interrupt + * occurs before we effectively enter the low power state + */ + __hard_irq_disable(); + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + + /* + * If anything happened while we were soft-disabled, + * we return now and do not enter the low power state. + */ + if (lazy_irq_pending()) + return false; + + /* Tell lockdep we are about to re-enable */ + trace_hardirqs_on(); + + /* + * Mark interrupts as soft-enabled and clear the + * PACA_IRQ_HARD_DIS from the pending mask since we + * are about to hard enable as well as a side effect + * of entering the low power state. + */ + local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS; + irq_soft_mask_set(IRQS_ENABLED); + + /* Tell the caller to enter the low power state */ + return true; +} + +#ifdef CONFIG_PPC_BOOK3S +/* + * This is for idle sequences that return with IRQs off, but the + * idle state itself wakes on interrupt. Tell the irq tracer that + * IRQs are enabled for the duration of idle so it does not get long + * off times. Must be paired with fini_irq_for_idle_irqsoff. + */ +bool prep_irq_for_idle_irqsoff(void) +{ + WARN_ON(!irqs_disabled()); + + /* + * First we need to hard disable to ensure no interrupt + * occurs before we effectively enter the low power state + */ + __hard_irq_disable(); + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + + /* + * If anything happened while we were soft-disabled, + * we return now and do not enter the low power state. + */ + if (lazy_irq_pending()) + return false; + + /* Tell lockdep we are about to re-enable */ + trace_hardirqs_on(); + + return true; +} + +/* + * Take the SRR1 wakeup reason, index into this table to find the + * appropriate irq_happened bit. + * + * Sytem reset exceptions taken in idle state also come through here, + * but they are NMI interrupts so do not need to wait for IRQs to be + * restored, and should be taken as early as practical. These are marked + * with 0xff in the table. The Power ISA specifies 0100b as the system + * reset interrupt reason. + */ +#define IRQ_SYSTEM_RESET 0xff + +static const u8 srr1_to_lazyirq[0x10] = { + 0, 0, 0, + PACA_IRQ_DBELL, + IRQ_SYSTEM_RESET, + PACA_IRQ_DBELL, + PACA_IRQ_DEC, + 0, + PACA_IRQ_EE, + PACA_IRQ_EE, + PACA_IRQ_HMI, + 0, 0, 0, 0, 0 }; + +void replay_system_reset(void) +{ + struct pt_regs regs; + + ppc_save_regs(®s); + regs.trap = 0x100; + get_paca()->in_nmi = 1; + system_reset_exception(®s); + get_paca()->in_nmi = 0; +} +EXPORT_SYMBOL_GPL(replay_system_reset); + +void irq_set_pending_from_srr1(unsigned long srr1) +{ + unsigned int idx = (srr1 & SRR1_WAKEMASK_P8) >> 18; + u8 reason = srr1_to_lazyirq[idx]; + + /* + * Take the system reset now, which is immediately after registers + * are restored from idle. It's an NMI, so interrupts need not be + * re-enabled before it is taken. + */ + if (unlikely(reason == IRQ_SYSTEM_RESET)) { + replay_system_reset(); + return; + } + + if (reason == PACA_IRQ_DBELL) { + /* + * When doorbell triggers a system reset wakeup, the message + * is not cleared, so if the doorbell interrupt is replayed + * and the IPI handled, the doorbell interrupt would still + * fire when EE is enabled. + * + * To avoid taking the superfluous doorbell interrupt, + * execute a msgclr here before the interrupt is replayed. + */ + ppc_msgclr(PPC_DBELL_MSGTYPE); + } + + /* + * The 0 index (SRR1[42:45]=b0000) must always evaluate to 0, + * so this can be called unconditionally with the SRR1 wake + * reason as returned by the idle code, which uses 0 to mean no + * interrupt. + * + * If a future CPU was to designate this as an interrupt reason, + * then a new index for no interrupt must be assigned. + */ + local_paca->irq_happened |= reason; +} +#endif /* CONFIG_PPC_BOOK3S */ + +/* + * Force a replay of the external interrupt handler on this CPU. + */ +void force_external_irq_replay(void) +{ + /* + * This must only be called with interrupts soft-disabled, + * the replay will happen when re-enabling. + */ + WARN_ON(!arch_irqs_disabled()); + + /* + * Interrupts must always be hard disabled before irq_happened is + * modified (to prevent lost update in case of interrupt between + * load and store). + */ + __hard_irq_disable(); + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + + /* Indicate in the PACA that we have an interrupt to replay */ + local_paca->irq_happened |= PACA_IRQ_EE; +} + +static int __init setup_noirqdistrib(char *str) +{ + distribute_irqs = 0; + return 1; +} + +__setup("noirqdistrib", setup_noirqdistrib); diff --git a/arch/powerpc/kernel/isa-bridge.c b/arch/powerpc/kernel/isa-bridge.c new file mode 100644 index 000000000..dc746611e --- /dev/null +++ b/arch/powerpc/kernel/isa-bridge.c @@ -0,0 +1,367 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Routines for tracking a legacy ISA bridge + * + * Copyrigh 2007 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp. + * + * Some bits and pieces moved over from pci_64.c + * + * Copyrigh 2003 Anton Blanchard <anton@au.ibm.com>, IBM Corp. + */ + +#define DEBUG + +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/string.h> +#include <linux/export.h> +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/notifier.h> +#include <linux/of_address.h> +#include <linux/vmalloc.h> + +#include <asm/processor.h> +#include <asm/io.h> +#include <asm/pci-bridge.h> +#include <asm/machdep.h> +#include <asm/ppc-pci.h> +#include <asm/isa-bridge.h> + +unsigned long isa_io_base; /* NULL if no ISA bus */ +EXPORT_SYMBOL(isa_io_base); + +/* Cached ISA bridge dev. */ +static struct device_node *isa_bridge_devnode; +struct pci_dev *isa_bridge_pcidev; +EXPORT_SYMBOL_GPL(isa_bridge_pcidev); + +#define ISA_SPACE_MASK 0x1 +#define ISA_SPACE_IO 0x1 + +static void remap_isa_base(phys_addr_t pa, unsigned long size) +{ + WARN_ON_ONCE(ISA_IO_BASE & ~PAGE_MASK); + WARN_ON_ONCE(pa & ~PAGE_MASK); + WARN_ON_ONCE(size & ~PAGE_MASK); + + if (slab_is_available()) { + if (ioremap_page_range(ISA_IO_BASE, ISA_IO_BASE + size, pa, + pgprot_noncached(PAGE_KERNEL))) + vunmap_range(ISA_IO_BASE, ISA_IO_BASE + size); + } else { + early_ioremap_range(ISA_IO_BASE, pa, size, + pgprot_noncached(PAGE_KERNEL)); + } +} + +static void pci_process_ISA_OF_ranges(struct device_node *isa_node, + unsigned long phb_io_base_phys) +{ + /* We should get some saner parsing here and remove these structs */ + struct pci_address { + u32 a_hi; + u32 a_mid; + u32 a_lo; + }; + + struct isa_address { + u32 a_hi; + u32 a_lo; + }; + + struct isa_range { + struct isa_address isa_addr; + struct pci_address pci_addr; + unsigned int size; + }; + + const struct isa_range *range; + unsigned long pci_addr; + unsigned int isa_addr; + unsigned int size; + int rlen = 0; + + range = of_get_property(isa_node, "ranges", &rlen); + if (range == NULL || (rlen < sizeof(struct isa_range))) + goto inval_range; + + /* From "ISA Binding to 1275" + * The ranges property is laid out as an array of elements, + * each of which comprises: + * cells 0 - 1: an ISA address + * cells 2 - 4: a PCI address + * (size depending on dev->n_addr_cells) + * cell 5: the size of the range + */ + if ((range->isa_addr.a_hi & ISA_SPACE_MASK) != ISA_SPACE_IO) { + range++; + rlen -= sizeof(struct isa_range); + if (rlen < sizeof(struct isa_range)) + goto inval_range; + } + if ((range->isa_addr.a_hi & ISA_SPACE_MASK) != ISA_SPACE_IO) + goto inval_range; + + isa_addr = range->isa_addr.a_lo; + pci_addr = (unsigned long) range->pci_addr.a_mid << 32 | + range->pci_addr.a_lo; + + /* Assume these are both zero. Note: We could fix that and + * do a proper parsing instead ... oh well, that will do for + * now as nobody uses fancy mappings for ISA bridges + */ + if ((pci_addr != 0) || (isa_addr != 0)) { + printk(KERN_ERR "unexpected isa to pci mapping: %s\n", + __func__); + return; + } + + /* Align size and make sure it's cropped to 64K */ + size = PAGE_ALIGN(range->size); + if (size > 0x10000) + size = 0x10000; + + remap_isa_base(phb_io_base_phys, size); + return; + +inval_range: + printk(KERN_ERR "no ISA IO ranges or unexpected isa range, " + "mapping 64k\n"); + remap_isa_base(phb_io_base_phys, 0x10000); +} + + +/** + * isa_bridge_find_early - Find and map the ISA IO space early before + * main PCI discovery. This is optionally called by + * the arch code when adding PCI PHBs to get early + * access to ISA IO ports + */ +void __init isa_bridge_find_early(struct pci_controller *hose) +{ + struct device_node *np, *parent = NULL, *tmp; + + /* If we already have an ISA bridge, bail off */ + if (isa_bridge_devnode != NULL) + return; + + /* For each "isa" node in the system. Note : we do a search by + * type and not by name. It might be better to do by name but that's + * what the code used to do and I don't want to break too much at + * once. We can look into changing that separately + */ + for_each_node_by_type(np, "isa") { + /* Look for our hose being a parent */ + for (parent = of_get_parent(np); parent;) { + if (parent == hose->dn) { + of_node_put(parent); + break; + } + tmp = parent; + parent = of_get_parent(parent); + of_node_put(tmp); + } + if (parent != NULL) + break; + } + if (np == NULL) + return; + isa_bridge_devnode = np; + + /* Now parse the "ranges" property and setup the ISA mapping */ + pci_process_ISA_OF_ranges(np, hose->io_base_phys); + + /* Set the global ISA io base to indicate we have an ISA bridge */ + isa_io_base = ISA_IO_BASE; + + pr_debug("ISA bridge (early) is %pOF\n", np); +} + +/** + * isa_bridge_find_early - Find and map the ISA IO space early before + * main PCI discovery. This is optionally called by + * the arch code when adding PCI PHBs to get early + * access to ISA IO ports + */ +void __init isa_bridge_init_non_pci(struct device_node *np) +{ + const __be32 *ranges, *pbasep = NULL; + int rlen, i, rs; + u32 na, ns, pna; + u64 cbase, pbase, size = 0; + + /* If we already have an ISA bridge, bail off */ + if (isa_bridge_devnode != NULL) + return; + + pna = of_n_addr_cells(np); + if (of_property_read_u32(np, "#address-cells", &na) || + of_property_read_u32(np, "#size-cells", &ns)) { + pr_warn("ISA: Non-PCI bridge %pOF is missing address format\n", + np); + return; + } + + /* Check it's a supported address format */ + if (na != 2 || ns != 1) { + pr_warn("ISA: Non-PCI bridge %pOF has unsupported address format\n", + np); + return; + } + rs = na + ns + pna; + + /* Grab the ranges property */ + ranges = of_get_property(np, "ranges", &rlen); + if (ranges == NULL || rlen < rs) { + pr_warn("ISA: Non-PCI bridge %pOF has absent or invalid ranges\n", + np); + return; + } + + /* Parse it. We are only looking for IO space */ + for (i = 0; (i + rs - 1) < rlen; i += rs) { + if (be32_to_cpup(ranges + i) != 1) + continue; + cbase = be32_to_cpup(ranges + i + 1); + size = of_read_number(ranges + i + na + pna, ns); + pbasep = ranges + i + na; + break; + } + + /* Got something ? */ + if (!size || !pbasep) { + pr_warn("ISA: Non-PCI bridge %pOF has no usable IO range\n", + np); + return; + } + + /* Align size and make sure it's cropped to 64K */ + size = PAGE_ALIGN(size); + if (size > 0x10000) + size = 0x10000; + + /* Map pbase */ + pbase = of_translate_address(np, pbasep); + if (pbase == OF_BAD_ADDR) { + pr_warn("ISA: Non-PCI bridge %pOF failed to translate IO base\n", + np); + return; + } + + /* We need page alignment */ + if ((cbase & ~PAGE_MASK) || (pbase & ~PAGE_MASK)) { + pr_warn("ISA: Non-PCI bridge %pOF has non aligned IO range\n", + np); + return; + } + + /* Got it */ + isa_bridge_devnode = np; + + /* Set the global ISA io base to indicate we have an ISA bridge + * and map it + */ + isa_io_base = ISA_IO_BASE; + remap_isa_base(pbase, size); + + pr_debug("ISA: Non-PCI bridge is %pOF\n", np); +} + +/** + * isa_bridge_find_late - Find and map the ISA IO space upon discovery of + * a new ISA bridge + */ +static void isa_bridge_find_late(struct pci_dev *pdev, + struct device_node *devnode) +{ + struct pci_controller *hose = pci_bus_to_host(pdev->bus); + + /* Store ISA device node and PCI device */ + isa_bridge_devnode = of_node_get(devnode); + isa_bridge_pcidev = pdev; + + /* Now parse the "ranges" property and setup the ISA mapping */ + pci_process_ISA_OF_ranges(devnode, hose->io_base_phys); + + /* Set the global ISA io base to indicate we have an ISA bridge */ + isa_io_base = ISA_IO_BASE; + + pr_debug("ISA bridge (late) is %pOF on %s\n", + devnode, pci_name(pdev)); +} + +/** + * isa_bridge_remove - Remove/unmap an ISA bridge + */ +static void isa_bridge_remove(void) +{ + pr_debug("ISA bridge removed !\n"); + + /* Clear the global ISA io base to indicate that we have no more + * ISA bridge. Note that drivers don't quite handle that, though + * we should probably do something about it. But do we ever really + * have ISA bridges being removed on machines using legacy devices ? + */ + isa_io_base = ISA_IO_BASE; + + /* Clear references to the bridge */ + of_node_put(isa_bridge_devnode); + isa_bridge_devnode = NULL; + isa_bridge_pcidev = NULL; + + /* Unmap the ISA area */ + vunmap_range(ISA_IO_BASE, ISA_IO_BASE + 0x10000); +} + +/** + * isa_bridge_notify - Get notified of PCI devices addition/removal + */ +static int isa_bridge_notify(struct notifier_block *nb, unsigned long action, + void *data) +{ + struct device *dev = data; + struct pci_dev *pdev = to_pci_dev(dev); + struct device_node *devnode = pci_device_to_OF_node(pdev); + + switch(action) { + case BUS_NOTIFY_ADD_DEVICE: + /* Check if we have an early ISA device, without PCI dev */ + if (isa_bridge_devnode && isa_bridge_devnode == devnode && + !isa_bridge_pcidev) { + pr_debug("ISA bridge PCI attached: %s\n", + pci_name(pdev)); + isa_bridge_pcidev = pdev; + } + + /* Check if we have no ISA device, and this happens to be one, + * register it as such if it has an OF device + */ + if (!isa_bridge_devnode && of_node_is_type(devnode, "isa")) + isa_bridge_find_late(pdev, devnode); + + return 0; + case BUS_NOTIFY_DEL_DEVICE: + /* Check if this our existing ISA device */ + if (pdev == isa_bridge_pcidev || + (devnode && devnode == isa_bridge_devnode)) + isa_bridge_remove(); + return 0; + } + return 0; +} + +static struct notifier_block isa_bridge_notifier = { + .notifier_call = isa_bridge_notify +}; + +/** + * isa_bridge_init - register to be notified of ISA bridge addition/removal + * + */ +static int __init isa_bridge_init(void) +{ + bus_register_notifier(&pci_bus_type, &isa_bridge_notifier); + return 0; +} +arch_initcall(isa_bridge_init); diff --git a/arch/powerpc/kernel/jump_label.c b/arch/powerpc/kernel/jump_label.c new file mode 100644 index 000000000..5277cf582 --- /dev/null +++ b/arch/powerpc/kernel/jump_label.c @@ -0,0 +1,20 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright 2010 Michael Ellerman, IBM Corp. + */ + +#include <linux/kernel.h> +#include <linux/jump_label.h> +#include <asm/code-patching.h> +#include <asm/inst.h> + +void arch_jump_label_transform(struct jump_entry *entry, + enum jump_label_type type) +{ + u32 *addr = (u32 *)jump_entry_code(entry); + + if (type == JUMP_LABEL_JMP) + patch_branch(addr, jump_entry_target(entry), 0); + else + patch_instruction(addr, ppc_inst(PPC_RAW_NOP())); +} diff --git a/arch/powerpc/kernel/kdebugfs.c b/arch/powerpc/kernel/kdebugfs.c new file mode 100644 index 000000000..36d3124d5 --- /dev/null +++ b/arch/powerpc/kernel/kdebugfs.c @@ -0,0 +1,14 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/debugfs.h> +#include <linux/export.h> +#include <linux/init.h> + +struct dentry *arch_debugfs_dir; +EXPORT_SYMBOL(arch_debugfs_dir); + +static int __init arch_kdebugfs_init(void) +{ + arch_debugfs_dir = debugfs_create_dir("powerpc", NULL); + return 0; +} +arch_initcall(arch_kdebugfs_init); diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c new file mode 100644 index 000000000..1a1e9995d --- /dev/null +++ b/arch/powerpc/kernel/kgdb.c @@ -0,0 +1,494 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * PowerPC backend to the KGDB stub. + * + * 1998 (c) Michael AK Tesch (tesch@cs.wisc.edu) + * Copyright (C) 2003 Timesys Corporation. + * Copyright (C) 2004-2006 MontaVista Software, Inc. + * PPC64 Mods (C) 2005 Frank Rowand (frowand@mvista.com) + * PPC32 support restored by Vitaly Wool <vwool@ru.mvista.com> and + * Sergei Shtylyov <sshtylyov@ru.mvista.com> + * Copyright (C) 2007-2008 Wind River Systems, Inc. + */ + +#include <linux/kernel.h> +#include <linux/kgdb.h> +#include <linux/smp.h> +#include <linux/signal.h> +#include <linux/ptrace.h> +#include <linux/kdebug.h> +#include <asm/current.h> +#include <asm/processor.h> +#include <asm/machdep.h> +#include <asm/debug.h> +#include <asm/code-patching.h> +#include <linux/slab.h> +#include <asm/inst.h> + +/* + * This table contains the mapping between PowerPC hardware trap types, and + * signals, which are primarily what GDB understands. GDB and the kernel + * don't always agree on values, so we use constants taken from gdb-6.2. + */ +static struct hard_trap_info +{ + unsigned int tt; /* Trap type code for powerpc */ + unsigned char signo; /* Signal that we map this trap into */ +} hard_trap_info[] = { + { 0x0100, 0x02 /* SIGINT */ }, /* system reset */ + { 0x0200, 0x0b /* SIGSEGV */ }, /* machine check */ + { 0x0300, 0x0b /* SIGSEGV */ }, /* data access */ + { 0x0400, 0x0b /* SIGSEGV */ }, /* instruction access */ + { 0x0500, 0x02 /* SIGINT */ }, /* external interrupt */ + { 0x0600, 0x0a /* SIGBUS */ }, /* alignment */ + { 0x0700, 0x05 /* SIGTRAP */ }, /* program check */ + { 0x0800, 0x08 /* SIGFPE */ }, /* fp unavailable */ + { 0x0900, 0x0e /* SIGALRM */ }, /* decrementer */ + { 0x0c00, 0x14 /* SIGCHLD */ }, /* system call */ +#ifdef CONFIG_BOOKE_OR_40x + { 0x2002, 0x05 /* SIGTRAP */ }, /* debug */ +#if defined(CONFIG_PPC_85xx) + { 0x2010, 0x08 /* SIGFPE */ }, /* spe unavailable */ + { 0x2020, 0x08 /* SIGFPE */ }, /* spe unavailable */ + { 0x2030, 0x08 /* SIGFPE */ }, /* spe fp data */ + { 0x2040, 0x08 /* SIGFPE */ }, /* spe fp data */ + { 0x2050, 0x08 /* SIGFPE */ }, /* spe fp round */ + { 0x2060, 0x0e /* SIGILL */ }, /* performance monitor */ + { 0x2900, 0x08 /* SIGFPE */ }, /* apu unavailable */ + { 0x3100, 0x0e /* SIGALRM */ }, /* fixed interval timer */ + { 0x3200, 0x02 /* SIGINT */ }, /* watchdog */ +#else /* ! CONFIG_PPC_85xx */ + { 0x1000, 0x0e /* SIGALRM */ }, /* prog interval timer */ + { 0x1010, 0x0e /* SIGALRM */ }, /* fixed interval timer */ + { 0x1020, 0x02 /* SIGINT */ }, /* watchdog */ + { 0x2010, 0x08 /* SIGFPE */ }, /* fp unavailable */ + { 0x2020, 0x08 /* SIGFPE */ }, /* ap unavailable */ +#endif +#else /* !CONFIG_BOOKE_OR_40x */ + { 0x0d00, 0x05 /* SIGTRAP */ }, /* single-step */ +#if defined(CONFIG_PPC_8xx) + { 0x1000, 0x04 /* SIGILL */ }, /* software emulation */ +#else /* ! CONFIG_PPC_8xx */ + { 0x0f00, 0x04 /* SIGILL */ }, /* performance monitor */ + { 0x0f20, 0x08 /* SIGFPE */ }, /* altivec unavailable */ + { 0x1300, 0x05 /* SIGTRAP */ }, /* instruction address break */ +#if defined(CONFIG_PPC64) + { 0x1200, 0x05 /* SIGILL */ }, /* system error */ + { 0x1500, 0x04 /* SIGILL */ }, /* soft patch */ + { 0x1600, 0x04 /* SIGILL */ }, /* maintenance */ + { 0x1700, 0x08 /* SIGFPE */ }, /* altivec assist */ + { 0x1800, 0x04 /* SIGILL */ }, /* thermal */ +#else /* ! CONFIG_PPC64 */ + { 0x1400, 0x02 /* SIGINT */ }, /* SMI */ + { 0x1600, 0x08 /* SIGFPE */ }, /* altivec assist */ + { 0x1700, 0x04 /* SIGILL */ }, /* TAU */ + { 0x2000, 0x05 /* SIGTRAP */ }, /* run mode */ +#endif +#endif +#endif + { 0x0000, 0x00 } /* Must be last */ +}; + +static int computeSignal(unsigned int tt) +{ + struct hard_trap_info *ht; + + for (ht = hard_trap_info; ht->tt && ht->signo; ht++) + if (ht->tt == tt) + return ht->signo; + + return SIGHUP; /* default for things we don't know about */ +} + +/** + * + * kgdb_skipexception - Bail out of KGDB when we've been triggered. + * @exception: Exception vector number + * @regs: Current &struct pt_regs. + * + * On some architectures we need to skip a breakpoint exception when + * it occurs after a breakpoint has been removed. + * + */ +int kgdb_skipexception(int exception, struct pt_regs *regs) +{ + return kgdb_isremovedbreak(regs->nip); +} + +static int kgdb_debugger_ipi(struct pt_regs *regs) +{ + kgdb_nmicallback(raw_smp_processor_id(), regs); + return 0; +} + +#ifdef CONFIG_SMP +void kgdb_roundup_cpus(void) +{ + smp_send_debugger_break(); +} +#endif + +/* KGDB functions to use existing PowerPC64 hooks. */ +static int kgdb_debugger(struct pt_regs *regs) +{ + return !kgdb_handle_exception(1, computeSignal(TRAP(regs)), + DIE_OOPS, regs); +} + +static int kgdb_handle_breakpoint(struct pt_regs *regs) +{ + if (user_mode(regs)) + return 0; + + if (kgdb_handle_exception(1, SIGTRAP, 0, regs) != 0) + return 0; + + if (*(u32 *)regs->nip == BREAK_INSTR) + regs_add_return_ip(regs, BREAK_INSTR_SIZE); + + return 1; +} + +static int kgdb_singlestep(struct pt_regs *regs) +{ + if (user_mode(regs)) + return 0; + + kgdb_handle_exception(0, SIGTRAP, 0, regs); + + return 1; +} + +static int kgdb_iabr_match(struct pt_regs *regs) +{ + if (user_mode(regs)) + return 0; + + if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0) + return 0; + return 1; +} + +static int kgdb_break_match(struct pt_regs *regs) +{ + if (user_mode(regs)) + return 0; + + if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0) + return 0; + return 1; +} + +#define PACK64(ptr, src) do { *(ptr++) = (src); } while (0) + +#define PACK32(ptr, src) do { \ + u32 *ptr32; \ + ptr32 = (u32 *)ptr; \ + *(ptr32++) = (src); \ + ptr = (unsigned long *)ptr32; \ + } while (0) + +void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) +{ + struct pt_regs *regs = (struct pt_regs *)(p->thread.ksp + + STACK_FRAME_OVERHEAD); + unsigned long *ptr = gdb_regs; + int reg; + + memset(gdb_regs, 0, NUMREGBYTES); + + /* Regs GPR0-2 */ + for (reg = 0; reg < 3; reg++) + PACK64(ptr, regs->gpr[reg]); + + /* Regs GPR3-13 are caller saved, not in regs->gpr[] */ + ptr += 11; + + /* Regs GPR14-31 */ + for (reg = 14; reg < 32; reg++) + PACK64(ptr, regs->gpr[reg]); + +#ifdef CONFIG_PPC_85xx +#ifdef CONFIG_SPE + for (reg = 0; reg < 32; reg++) + PACK64(ptr, p->thread.evr[reg]); +#else + ptr += 32; +#endif +#else + /* fp registers not used by kernel, leave zero */ + ptr += 32 * 8 / sizeof(long); +#endif + + PACK64(ptr, regs->nip); + PACK64(ptr, regs->msr); + PACK32(ptr, regs->ccr); + PACK64(ptr, regs->link); + PACK64(ptr, regs->ctr); + PACK32(ptr, regs->xer); + + BUG_ON((unsigned long)ptr > + (unsigned long)(((void *)gdb_regs) + NUMREGBYTES)); +} + +#define GDB_SIZEOF_REG sizeof(unsigned long) +#define GDB_SIZEOF_REG_U32 sizeof(u32) + +#ifdef CONFIG_PPC_85xx +#define GDB_SIZEOF_FLOAT_REG sizeof(unsigned long) +#else +#define GDB_SIZEOF_FLOAT_REG sizeof(u64) +#endif + +struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = +{ + { "r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[0]) }, + { "r1", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[1]) }, + { "r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[2]) }, + { "r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[3]) }, + { "r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[4]) }, + { "r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[5]) }, + { "r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[6]) }, + { "r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[7]) }, + { "r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[8]) }, + { "r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[9]) }, + { "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[10]) }, + { "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[11]) }, + { "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[12]) }, + { "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[13]) }, + { "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[14]) }, + { "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[15]) }, + { "r16", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[16]) }, + { "r17", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[17]) }, + { "r18", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[18]) }, + { "r19", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[19]) }, + { "r20", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[20]) }, + { "r21", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[21]) }, + { "r22", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[22]) }, + { "r23", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[23]) }, + { "r24", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[24]) }, + { "r25", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[25]) }, + { "r26", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[26]) }, + { "r27", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[27]) }, + { "r28", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[28]) }, + { "r29", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[29]) }, + { "r30", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[30]) }, + { "r31", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[31]) }, + + { "f0", GDB_SIZEOF_FLOAT_REG, 0 }, + { "f1", GDB_SIZEOF_FLOAT_REG, 1 }, + { "f2", GDB_SIZEOF_FLOAT_REG, 2 }, + { "f3", GDB_SIZEOF_FLOAT_REG, 3 }, + { "f4", GDB_SIZEOF_FLOAT_REG, 4 }, + { "f5", GDB_SIZEOF_FLOAT_REG, 5 }, + { "f6", GDB_SIZEOF_FLOAT_REG, 6 }, + { "f7", GDB_SIZEOF_FLOAT_REG, 7 }, + { "f8", GDB_SIZEOF_FLOAT_REG, 8 }, + { "f9", GDB_SIZEOF_FLOAT_REG, 9 }, + { "f10", GDB_SIZEOF_FLOAT_REG, 10 }, + { "f11", GDB_SIZEOF_FLOAT_REG, 11 }, + { "f12", GDB_SIZEOF_FLOAT_REG, 12 }, + { "f13", GDB_SIZEOF_FLOAT_REG, 13 }, + { "f14", GDB_SIZEOF_FLOAT_REG, 14 }, + { "f15", GDB_SIZEOF_FLOAT_REG, 15 }, + { "f16", GDB_SIZEOF_FLOAT_REG, 16 }, + { "f17", GDB_SIZEOF_FLOAT_REG, 17 }, + { "f18", GDB_SIZEOF_FLOAT_REG, 18 }, + { "f19", GDB_SIZEOF_FLOAT_REG, 19 }, + { "f20", GDB_SIZEOF_FLOAT_REG, 20 }, + { "f21", GDB_SIZEOF_FLOAT_REG, 21 }, + { "f22", GDB_SIZEOF_FLOAT_REG, 22 }, + { "f23", GDB_SIZEOF_FLOAT_REG, 23 }, + { "f24", GDB_SIZEOF_FLOAT_REG, 24 }, + { "f25", GDB_SIZEOF_FLOAT_REG, 25 }, + { "f26", GDB_SIZEOF_FLOAT_REG, 26 }, + { "f27", GDB_SIZEOF_FLOAT_REG, 27 }, + { "f28", GDB_SIZEOF_FLOAT_REG, 28 }, + { "f29", GDB_SIZEOF_FLOAT_REG, 29 }, + { "f30", GDB_SIZEOF_FLOAT_REG, 30 }, + { "f31", GDB_SIZEOF_FLOAT_REG, 31 }, + + { "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, nip) }, + { "msr", GDB_SIZEOF_REG, offsetof(struct pt_regs, msr) }, + { "cr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ccr) }, + { "lr", GDB_SIZEOF_REG, offsetof(struct pt_regs, link) }, + { "ctr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ctr) }, + { "xer", GDB_SIZEOF_REG, offsetof(struct pt_regs, xer) }, +}; + +char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs) +{ + if (regno >= DBG_MAX_REG_NUM || regno < 0) + return NULL; + + if (regno < 32 || regno >= 64) + /* First 0 -> 31 gpr registers*/ + /* pc, msr, ls... registers 64 -> 69 */ + memcpy(mem, (void *)regs + dbg_reg_def[regno].offset, + dbg_reg_def[regno].size); + + if (regno >= 32 && regno < 64) { + /* FP registers 32 -> 63 */ +#if defined(CONFIG_PPC_85xx) && defined(CONFIG_SPE) + if (current) + memcpy(mem, ¤t->thread.evr[regno-32], + dbg_reg_def[regno].size); +#else + /* fp registers not used by kernel, leave zero */ + memset(mem, 0, dbg_reg_def[regno].size); +#endif + } + + return dbg_reg_def[regno].name; +} + +int dbg_set_reg(int regno, void *mem, struct pt_regs *regs) +{ + if (regno >= DBG_MAX_REG_NUM || regno < 0) + return -EINVAL; + + if (regno < 32 || regno >= 64) + /* First 0 -> 31 gpr registers*/ + /* pc, msr, ls... registers 64 -> 69 */ + memcpy((void *)regs + dbg_reg_def[regno].offset, mem, + dbg_reg_def[regno].size); + + if (regno >= 32 && regno < 64) { + /* FP registers 32 -> 63 */ +#if defined(CONFIG_PPC_85xx) && defined(CONFIG_SPE) + memcpy(¤t->thread.evr[regno-32], mem, + dbg_reg_def[regno].size); +#else + /* fp registers not used by kernel, leave zero */ + return 0; +#endif + } + + return 0; +} + +void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc) +{ + regs_set_return_ip(regs, pc); +} + +/* + * This function does PowerPC specific processing for interfacing to gdb. + */ +int kgdb_arch_handle_exception(int vector, int signo, int err_code, + char *remcom_in_buffer, char *remcom_out_buffer, + struct pt_regs *linux_regs) +{ + char *ptr = &remcom_in_buffer[1]; + unsigned long addr; + + switch (remcom_in_buffer[0]) { + /* + * sAA..AA Step one instruction from AA..AA + * This will return an error to gdb .. + */ + case 's': + case 'c': + /* handle the optional parameter */ + if (kgdb_hex2long(&ptr, &addr)) + regs_set_return_ip(linux_regs, addr); + + atomic_set(&kgdb_cpu_doing_single_step, -1); + /* set the trace bit if we're stepping */ + if (remcom_in_buffer[0] == 's') { +#ifdef CONFIG_PPC_ADV_DEBUG_REGS + mtspr(SPRN_DBCR0, + mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM); + regs_set_return_msr(linux_regs, linux_regs->msr | MSR_DE); +#else + regs_set_return_msr(linux_regs, linux_regs->msr | MSR_SE); +#endif + atomic_set(&kgdb_cpu_doing_single_step, + raw_smp_processor_id()); + } + return 0; + } + + return -1; +} + +int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt) +{ + u32 instr, *addr = (u32 *)bpt->bpt_addr; + int err; + + err = get_kernel_nofault(instr, addr); + if (err) + return err; + + err = patch_instruction(addr, ppc_inst(BREAK_INSTR)); + if (err) + return -EFAULT; + + *(u32 *)bpt->saved_instr = instr; + + return 0; +} + +int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt) +{ + int err; + unsigned int instr = *(unsigned int *)bpt->saved_instr; + u32 *addr = (u32 *)bpt->bpt_addr; + + err = patch_instruction(addr, ppc_inst(instr)); + if (err) + return -EFAULT; + + return 0; +} + +/* + * Global data + */ +const struct kgdb_arch arch_kgdb_ops; + +static int kgdb_not_implemented(struct pt_regs *regs) +{ + return 0; +} + +static void *old__debugger_ipi; +static void *old__debugger; +static void *old__debugger_bpt; +static void *old__debugger_sstep; +static void *old__debugger_iabr_match; +static void *old__debugger_break_match; +static void *old__debugger_fault_handler; + +int kgdb_arch_init(void) +{ + old__debugger_ipi = __debugger_ipi; + old__debugger = __debugger; + old__debugger_bpt = __debugger_bpt; + old__debugger_sstep = __debugger_sstep; + old__debugger_iabr_match = __debugger_iabr_match; + old__debugger_break_match = __debugger_break_match; + old__debugger_fault_handler = __debugger_fault_handler; + + __debugger_ipi = kgdb_debugger_ipi; + __debugger = kgdb_debugger; + __debugger_bpt = kgdb_handle_breakpoint; + __debugger_sstep = kgdb_singlestep; + __debugger_iabr_match = kgdb_iabr_match; + __debugger_break_match = kgdb_break_match; + __debugger_fault_handler = kgdb_not_implemented; + + return 0; +} + +void kgdb_arch_exit(void) +{ + __debugger_ipi = old__debugger_ipi; + __debugger = old__debugger; + __debugger_bpt = old__debugger_bpt; + __debugger_sstep = old__debugger_sstep; + __debugger_iabr_match = old__debugger_iabr_match; + __debugger_break_match = old__debugger_break_match; + __debugger_fault_handler = old__debugger_fault_handler; +} diff --git a/arch/powerpc/kernel/kprobes-ftrace.c b/arch/powerpc/kernel/kprobes-ftrace.c new file mode 100644 index 000000000..072ebe7f2 --- /dev/null +++ b/arch/powerpc/kernel/kprobes-ftrace.c @@ -0,0 +1,72 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Dynamic Ftrace based Kprobes Optimization + * + * Copyright (C) Hitachi Ltd., 2012 + * Copyright 2016 Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> + * IBM Corporation + */ +#include <linux/kprobes.h> +#include <linux/ptrace.h> +#include <linux/hardirq.h> +#include <linux/preempt.h> +#include <linux/ftrace.h> + +/* Ftrace callback handler for kprobes */ +void kprobe_ftrace_handler(unsigned long nip, unsigned long parent_nip, + struct ftrace_ops *ops, struct ftrace_regs *fregs) +{ + struct kprobe *p; + struct kprobe_ctlblk *kcb; + struct pt_regs *regs; + int bit; + + bit = ftrace_test_recursion_trylock(nip, parent_nip); + if (bit < 0) + return; + + regs = ftrace_get_regs(fregs); + p = get_kprobe((kprobe_opcode_t *)nip); + if (unlikely(!p) || kprobe_disabled(p)) + goto out; + + kcb = get_kprobe_ctlblk(); + if (kprobe_running()) { + kprobes_inc_nmissed_count(p); + } else { + /* + * On powerpc, NIP is *before* this instruction for the + * pre handler + */ + regs_add_return_ip(regs, -MCOUNT_INSN_SIZE); + + __this_cpu_write(current_kprobe, p); + kcb->kprobe_status = KPROBE_HIT_ACTIVE; + if (!p->pre_handler || !p->pre_handler(p, regs)) { + /* + * Emulate singlestep (and also recover regs->nip) + * as if there is a nop + */ + regs_add_return_ip(regs, MCOUNT_INSN_SIZE); + if (unlikely(p->post_handler)) { + kcb->kprobe_status = KPROBE_HIT_SSDONE; + p->post_handler(p, regs, 0); + } + } + /* + * If pre_handler returns !0, it changes regs->nip. We have to + * skip emulating post_handler. + */ + __this_cpu_write(current_kprobe, NULL); + } +out: + ftrace_test_recursion_unlock(bit); +} +NOKPROBE_SYMBOL(kprobe_ftrace_handler); + +int arch_prepare_kprobe_ftrace(struct kprobe *p) +{ + p->ainsn.insn = NULL; + p->ainsn.boostable = -1; + return 0; +} diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c new file mode 100644 index 000000000..bd7b1a035 --- /dev/null +++ b/arch/powerpc/kernel/kprobes.c @@ -0,0 +1,576 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Kernel Probes (KProbes) + * + * Copyright (C) IBM Corporation, 2002, 2004 + * + * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel + * Probes initial implementation ( includes contributions from + * Rusty Russell). + * 2004-July Suparna Bhattacharya <suparna@in.ibm.com> added jumper probes + * interface to access function arguments. + * 2004-Nov Ananth N Mavinakayanahalli <ananth@in.ibm.com> kprobes port + * for PPC64 + */ + +#include <linux/kprobes.h> +#include <linux/ptrace.h> +#include <linux/preempt.h> +#include <linux/extable.h> +#include <linux/kdebug.h> +#include <linux/slab.h> +#include <linux/moduleloader.h> +#include <asm/code-patching.h> +#include <asm/cacheflush.h> +#include <asm/sstep.h> +#include <asm/sections.h> +#include <asm/inst.h> +#include <asm/set_memory.h> +#include <linux/uaccess.h> + +DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL; +DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk); + +struct kretprobe_blackpoint kretprobe_blacklist[] = {{NULL, NULL}}; + +bool arch_within_kprobe_blacklist(unsigned long addr) +{ + return (addr >= (unsigned long)__kprobes_text_start && + addr < (unsigned long)__kprobes_text_end) || + (addr >= (unsigned long)_stext && + addr < (unsigned long)__head_end); +} + +kprobe_opcode_t *kprobe_lookup_name(const char *name, unsigned int offset) +{ + kprobe_opcode_t *addr = NULL; + +#ifdef CONFIG_PPC64_ELF_ABI_V2 + /* PPC64 ABIv2 needs local entry point */ + addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); + if (addr && !offset) { +#ifdef CONFIG_KPROBES_ON_FTRACE + unsigned long faddr; + /* + * Per livepatch.h, ftrace location is always within the first + * 16 bytes of a function on powerpc with -mprofile-kernel. + */ + faddr = ftrace_location_range((unsigned long)addr, + (unsigned long)addr + 16); + if (faddr) + addr = (kprobe_opcode_t *)faddr; + else +#endif + addr = (kprobe_opcode_t *)ppc_function_entry(addr); + } +#elif defined(CONFIG_PPC64_ELF_ABI_V1) + /* + * 64bit powerpc ABIv1 uses function descriptors: + * - Check for the dot variant of the symbol first. + * - If that fails, try looking up the symbol provided. + * + * This ensures we always get to the actual symbol and not + * the descriptor. + * + * Also handle <module:symbol> format. + */ + char dot_name[MODULE_NAME_LEN + 1 + KSYM_NAME_LEN]; + bool dot_appended = false; + const char *c; + ssize_t ret = 0; + int len = 0; + + if ((c = strnchr(name, MODULE_NAME_LEN, ':')) != NULL) { + c++; + len = c - name; + memcpy(dot_name, name, len); + } else + c = name; + + if (*c != '\0' && *c != '.') { + dot_name[len++] = '.'; + dot_appended = true; + } + ret = strscpy(dot_name + len, c, KSYM_NAME_LEN); + if (ret > 0) + addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); + + /* Fallback to the original non-dot symbol lookup */ + if (!addr && dot_appended) + addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); +#else + addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); +#endif + + return addr; +} + +static bool arch_kprobe_on_func_entry(unsigned long offset) +{ +#ifdef CONFIG_PPC64_ELF_ABI_V2 +#ifdef CONFIG_KPROBES_ON_FTRACE + return offset <= 16; +#else + return offset <= 8; +#endif +#else + return !offset; +#endif +} + +/* XXX try and fold the magic of kprobe_lookup_name() in this */ +kprobe_opcode_t *arch_adjust_kprobe_addr(unsigned long addr, unsigned long offset, + bool *on_func_entry) +{ + *on_func_entry = arch_kprobe_on_func_entry(offset); + return (kprobe_opcode_t *)(addr + offset); +} + +void *alloc_insn_page(void) +{ + void *page; + + page = module_alloc(PAGE_SIZE); + if (!page) + return NULL; + + if (strict_module_rwx_enabled()) { + set_memory_ro((unsigned long)page, 1); + set_memory_x((unsigned long)page, 1); + } + return page; +} + +int arch_prepare_kprobe(struct kprobe *p) +{ + int ret = 0; + struct kprobe *prev; + ppc_inst_t insn = ppc_inst_read(p->addr); + + if ((unsigned long)p->addr & 0x03) { + printk("Attempt to register kprobe at an unaligned address\n"); + ret = -EINVAL; + } else if (!can_single_step(ppc_inst_val(insn))) { + printk("Cannot register a kprobe on instructions that can't be single stepped\n"); + ret = -EINVAL; + } else if ((unsigned long)p->addr & ~PAGE_MASK && + ppc_inst_prefixed(ppc_inst_read(p->addr - 1))) { + printk("Cannot register a kprobe on the second word of prefixed instruction\n"); + ret = -EINVAL; + } + preempt_disable(); + prev = get_kprobe(p->addr - 1); + preempt_enable_no_resched(); + + /* + * When prev is a ftrace-based kprobe, we don't have an insn, and it + * doesn't probe for prefixed instruction. + */ + if (prev && !kprobe_ftrace(prev) && + ppc_inst_prefixed(ppc_inst_read(prev->ainsn.insn))) { + printk("Cannot register a kprobe on the second word of prefixed instruction\n"); + ret = -EINVAL; + } + + /* insn must be on a special executable page on ppc64. This is + * not explicitly required on ppc32 (right now), but it doesn't hurt */ + if (!ret) { + p->ainsn.insn = get_insn_slot(); + if (!p->ainsn.insn) + ret = -ENOMEM; + } + + if (!ret) { + patch_instruction(p->ainsn.insn, insn); + p->opcode = ppc_inst_val(insn); + } + + p->ainsn.boostable = 0; + return ret; +} +NOKPROBE_SYMBOL(arch_prepare_kprobe); + +void arch_arm_kprobe(struct kprobe *p) +{ + WARN_ON_ONCE(patch_instruction(p->addr, ppc_inst(BREAKPOINT_INSTRUCTION))); +} +NOKPROBE_SYMBOL(arch_arm_kprobe); + +void arch_disarm_kprobe(struct kprobe *p) +{ + WARN_ON_ONCE(patch_instruction(p->addr, ppc_inst(p->opcode))); +} +NOKPROBE_SYMBOL(arch_disarm_kprobe); + +void arch_remove_kprobe(struct kprobe *p) +{ + if (p->ainsn.insn) { + free_insn_slot(p->ainsn.insn, 0); + p->ainsn.insn = NULL; + } +} +NOKPROBE_SYMBOL(arch_remove_kprobe); + +static nokprobe_inline void prepare_singlestep(struct kprobe *p, struct pt_regs *regs) +{ + enable_single_step(regs); + + /* + * On powerpc we should single step on the original + * instruction even if the probed insn is a trap + * variant as values in regs could play a part in + * if the trap is taken or not + */ + regs_set_return_ip(regs, (unsigned long)p->ainsn.insn); +} + +static nokprobe_inline void save_previous_kprobe(struct kprobe_ctlblk *kcb) +{ + kcb->prev_kprobe.kp = kprobe_running(); + kcb->prev_kprobe.status = kcb->kprobe_status; + kcb->prev_kprobe.saved_msr = kcb->kprobe_saved_msr; +} + +static nokprobe_inline void restore_previous_kprobe(struct kprobe_ctlblk *kcb) +{ + __this_cpu_write(current_kprobe, kcb->prev_kprobe.kp); + kcb->kprobe_status = kcb->prev_kprobe.status; + kcb->kprobe_saved_msr = kcb->prev_kprobe.saved_msr; +} + +static nokprobe_inline void set_current_kprobe(struct kprobe *p, struct pt_regs *regs, + struct kprobe_ctlblk *kcb) +{ + __this_cpu_write(current_kprobe, p); + kcb->kprobe_saved_msr = regs->msr; +} + +void arch_prepare_kretprobe(struct kretprobe_instance *ri, struct pt_regs *regs) +{ + ri->ret_addr = (kprobe_opcode_t *)regs->link; + ri->fp = NULL; + + /* Replace the return addr with trampoline addr */ + regs->link = (unsigned long)__kretprobe_trampoline; +} +NOKPROBE_SYMBOL(arch_prepare_kretprobe); + +static int try_to_emulate(struct kprobe *p, struct pt_regs *regs) +{ + int ret; + ppc_inst_t insn = ppc_inst_read(p->ainsn.insn); + + /* regs->nip is also adjusted if emulate_step returns 1 */ + ret = emulate_step(regs, insn); + if (ret > 0) { + /* + * Once this instruction has been boosted + * successfully, set the boostable flag + */ + if (unlikely(p->ainsn.boostable == 0)) + p->ainsn.boostable = 1; + } else if (ret < 0) { + /* + * We don't allow kprobes on mtmsr(d)/rfi(d), etc. + * So, we should never get here... but, its still + * good to catch them, just in case... + */ + printk("Can't step on instruction %08lx\n", ppc_inst_as_ulong(insn)); + BUG(); + } else { + /* + * If we haven't previously emulated this instruction, then it + * can't be boosted. Note it down so we don't try to do so again. + * + * If, however, we had emulated this instruction in the past, + * then this is just an error with the current run (for + * instance, exceptions due to a load/store). We return 0 so + * that this is now single-stepped, but continue to try + * emulating it in subsequent probe hits. + */ + if (unlikely(p->ainsn.boostable != 1)) + p->ainsn.boostable = -1; + } + + return ret; +} +NOKPROBE_SYMBOL(try_to_emulate); + +int kprobe_handler(struct pt_regs *regs) +{ + struct kprobe *p; + int ret = 0; + unsigned int *addr = (unsigned int *)regs->nip; + struct kprobe_ctlblk *kcb; + + if (user_mode(regs)) + return 0; + + if (!IS_ENABLED(CONFIG_BOOKE) && + (!(regs->msr & MSR_IR) || !(regs->msr & MSR_DR))) + return 0; + + /* + * We don't want to be preempted for the entire + * duration of kprobe processing + */ + preempt_disable(); + kcb = get_kprobe_ctlblk(); + + p = get_kprobe(addr); + if (!p) { + unsigned int instr; + + if (get_kernel_nofault(instr, addr)) + goto no_kprobe; + + if (instr != BREAKPOINT_INSTRUCTION) { + /* + * PowerPC has multiple variants of the "trap" + * instruction. If the current instruction is a + * trap variant, it could belong to someone else + */ + if (is_trap(instr)) + goto no_kprobe; + /* + * The breakpoint instruction was removed right + * after we hit it. Another cpu has removed + * either a probepoint or a debugger breakpoint + * at this address. In either case, no further + * handling of this interrupt is appropriate. + */ + ret = 1; + } + /* Not one of ours: let kernel handle it */ + goto no_kprobe; + } + + /* Check we're not actually recursing */ + if (kprobe_running()) { + kprobe_opcode_t insn = *p->ainsn.insn; + if (kcb->kprobe_status == KPROBE_HIT_SS && is_trap(insn)) { + /* Turn off 'trace' bits */ + regs_set_return_msr(regs, + (regs->msr & ~MSR_SINGLESTEP) | + kcb->kprobe_saved_msr); + goto no_kprobe; + } + + /* + * We have reentered the kprobe_handler(), since another probe + * was hit while within the handler. We here save the original + * kprobes variables and just single step on the instruction of + * the new probe without calling any user handlers. + */ + save_previous_kprobe(kcb); + set_current_kprobe(p, regs, kcb); + kprobes_inc_nmissed_count(p); + kcb->kprobe_status = KPROBE_REENTER; + if (p->ainsn.boostable >= 0) { + ret = try_to_emulate(p, regs); + + if (ret > 0) { + restore_previous_kprobe(kcb); + preempt_enable_no_resched(); + return 1; + } + } + prepare_singlestep(p, regs); + return 1; + } + + kcb->kprobe_status = KPROBE_HIT_ACTIVE; + set_current_kprobe(p, regs, kcb); + if (p->pre_handler && p->pre_handler(p, regs)) { + /* handler changed execution path, so skip ss setup */ + reset_current_kprobe(); + preempt_enable_no_resched(); + return 1; + } + + if (p->ainsn.boostable >= 0) { + ret = try_to_emulate(p, regs); + + if (ret > 0) { + if (p->post_handler) + p->post_handler(p, regs, 0); + + kcb->kprobe_status = KPROBE_HIT_SSDONE; + reset_current_kprobe(); + preempt_enable_no_resched(); + return 1; + } + } + prepare_singlestep(p, regs); + kcb->kprobe_status = KPROBE_HIT_SS; + return 1; + +no_kprobe: + preempt_enable_no_resched(); + return ret; +} +NOKPROBE_SYMBOL(kprobe_handler); + +/* + * Function return probe trampoline: + * - init_kprobes() establishes a probepoint here + * - When the probed function returns, this probe + * causes the handlers to fire + */ +asm(".global __kretprobe_trampoline\n" + ".type __kretprobe_trampoline, @function\n" + "__kretprobe_trampoline:\n" + "nop\n" + "blr\n" + ".size __kretprobe_trampoline, .-__kretprobe_trampoline\n"); + +/* + * Called when the probe at kretprobe trampoline is hit + */ +static int trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs) +{ + unsigned long orig_ret_address; + + orig_ret_address = __kretprobe_trampoline_handler(regs, NULL); + /* + * We get here through one of two paths: + * 1. by taking a trap -> kprobe_handler() -> here + * 2. by optprobe branch -> optimized_callback() -> opt_pre_handler() -> here + * + * When going back through (1), we need regs->nip to be setup properly + * as it is used to determine the return address from the trap. + * For (2), since nip is not honoured with optprobes, we instead setup + * the link register properly so that the subsequent 'blr' in + * __kretprobe_trampoline jumps back to the right instruction. + * + * For nip, we should set the address to the previous instruction since + * we end up emulating it in kprobe_handler(), which increments the nip + * again. + */ + regs_set_return_ip(regs, orig_ret_address - 4); + regs->link = orig_ret_address; + + return 0; +} +NOKPROBE_SYMBOL(trampoline_probe_handler); + +/* + * Called after single-stepping. p->addr is the address of the + * instruction whose first byte has been replaced by the "breakpoint" + * instruction. To avoid the SMP problems that can occur when we + * temporarily put back the original opcode to single-step, we + * single-stepped a copy of the instruction. The address of this + * copy is p->ainsn.insn. + */ +int kprobe_post_handler(struct pt_regs *regs) +{ + int len; + struct kprobe *cur = kprobe_running(); + struct kprobe_ctlblk *kcb = get_kprobe_ctlblk(); + + if (!cur || user_mode(regs)) + return 0; + + len = ppc_inst_len(ppc_inst_read(cur->ainsn.insn)); + /* make sure we got here for instruction we have a kprobe on */ + if (((unsigned long)cur->ainsn.insn + len) != regs->nip) + return 0; + + if ((kcb->kprobe_status != KPROBE_REENTER) && cur->post_handler) { + kcb->kprobe_status = KPROBE_HIT_SSDONE; + cur->post_handler(cur, regs, 0); + } + + /* Adjust nip to after the single-stepped instruction */ + regs_set_return_ip(regs, (unsigned long)cur->addr + len); + regs_set_return_msr(regs, regs->msr | kcb->kprobe_saved_msr); + + /*Restore back the original saved kprobes variables and continue. */ + if (kcb->kprobe_status == KPROBE_REENTER) { + restore_previous_kprobe(kcb); + goto out; + } + reset_current_kprobe(); +out: + preempt_enable_no_resched(); + + /* + * if somebody else is singlestepping across a probe point, msr + * will have DE/SE set, in which case, continue the remaining processing + * of do_debug, as if this is not a probe hit. + */ + if (regs->msr & MSR_SINGLESTEP) + return 0; + + return 1; +} +NOKPROBE_SYMBOL(kprobe_post_handler); + +int kprobe_fault_handler(struct pt_regs *regs, int trapnr) +{ + struct kprobe *cur = kprobe_running(); + struct kprobe_ctlblk *kcb = get_kprobe_ctlblk(); + const struct exception_table_entry *entry; + + switch(kcb->kprobe_status) { + case KPROBE_HIT_SS: + case KPROBE_REENTER: + /* + * We are here because the instruction being single + * stepped caused a page fault. We reset the current + * kprobe and the nip points back to the probe address + * and allow the page fault handler to continue as a + * normal page fault. + */ + regs_set_return_ip(regs, (unsigned long)cur->addr); + /* Turn off 'trace' bits */ + regs_set_return_msr(regs, + (regs->msr & ~MSR_SINGLESTEP) | + kcb->kprobe_saved_msr); + if (kcb->kprobe_status == KPROBE_REENTER) + restore_previous_kprobe(kcb); + else + reset_current_kprobe(); + preempt_enable_no_resched(); + break; + case KPROBE_HIT_ACTIVE: + case KPROBE_HIT_SSDONE: + /* + * In case the user-specified fault handler returned + * zero, try to fix up. + */ + if ((entry = search_exception_tables(regs->nip)) != NULL) { + regs_set_return_ip(regs, extable_fixup(entry)); + return 1; + } + + /* + * fixup_exception() could not handle it, + * Let do_page_fault() fix it. + */ + break; + default: + break; + } + return 0; +} +NOKPROBE_SYMBOL(kprobe_fault_handler); + +static struct kprobe trampoline_p = { + .addr = (kprobe_opcode_t *) &__kretprobe_trampoline, + .pre_handler = trampoline_probe_handler +}; + +int __init arch_init_kprobes(void) +{ + return register_kprobe(&trampoline_p); +} + +int arch_trampoline_kprobe(struct kprobe *p) +{ + if (p->addr == (kprobe_opcode_t *)&__kretprobe_trampoline) + return 1; + + return 0; +} +NOKPROBE_SYMBOL(arch_trampoline_kprobe); diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c new file mode 100644 index 000000000..5b3c09361 --- /dev/null +++ b/arch/powerpc/kernel/kvm.c @@ -0,0 +1,723 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved. + * Copyright 2010-2011 Freescale Semiconductor, Inc. + * + * Authors: + * Alexander Graf <agraf@suse.de> + */ + +#include <linux/kvm_host.h> +#include <linux/init.h> +#include <linux/export.h> +#include <linux/kmemleak.h> +#include <linux/kvm_para.h> +#include <linux/slab.h> +#include <linux/of.h> +#include <linux/pagemap.h> + +#include <asm/reg.h> +#include <asm/sections.h> +#include <asm/cacheflush.h> +#include <asm/disassemble.h> +#include <asm/ppc-opcode.h> +#include <asm/epapr_hcalls.h> + +#define KVM_MAGIC_PAGE (-4096L) +#define magic_var(x) KVM_MAGIC_PAGE + offsetof(struct kvm_vcpu_arch_shared, x) + +#define KVM_INST_LWZ 0x80000000 +#define KVM_INST_STW 0x90000000 +#define KVM_INST_LD 0xe8000000 +#define KVM_INST_STD 0xf8000000 +#define KVM_INST_NOP 0x60000000 +#define KVM_INST_B 0x48000000 +#define KVM_INST_B_MASK 0x03ffffff +#define KVM_INST_B_MAX 0x01ffffff +#define KVM_INST_LI 0x38000000 + +#define KVM_MASK_RT 0x03e00000 +#define KVM_RT_30 0x03c00000 +#define KVM_MASK_RB 0x0000f800 +#define KVM_INST_MFMSR 0x7c0000a6 + +#define SPR_FROM 0 +#define SPR_TO 0x100 + +#define KVM_INST_SPR(sprn, moveto) (0x7c0002a6 | \ + (((sprn) & 0x1f) << 16) | \ + (((sprn) & 0x3e0) << 6) | \ + (moveto)) + +#define KVM_INST_MFSPR(sprn) KVM_INST_SPR(sprn, SPR_FROM) +#define KVM_INST_MTSPR(sprn) KVM_INST_SPR(sprn, SPR_TO) + +#define KVM_INST_TLBSYNC 0x7c00046c +#define KVM_INST_MTMSRD_L0 0x7c000164 +#define KVM_INST_MTMSRD_L1 0x7c010164 +#define KVM_INST_MTMSR 0x7c000124 + +#define KVM_INST_WRTEE 0x7c000106 +#define KVM_INST_WRTEEI_0 0x7c000146 +#define KVM_INST_WRTEEI_1 0x7c008146 + +#define KVM_INST_MTSRIN 0x7c0001e4 + +static bool kvm_patching_worked = true; +extern char kvm_tmp[]; +extern char kvm_tmp_end[]; +static int kvm_tmp_index; + +static void __init kvm_patch_ins(u32 *inst, u32 new_inst) +{ + *inst = new_inst; + flush_icache_range((ulong)inst, (ulong)inst + 4); +} + +static void __init kvm_patch_ins_ll(u32 *inst, long addr, u32 rt) +{ +#ifdef CONFIG_64BIT + kvm_patch_ins(inst, KVM_INST_LD | rt | (addr & 0x0000fffc)); +#else + kvm_patch_ins(inst, KVM_INST_LWZ | rt | (addr & 0x0000fffc)); +#endif +} + +static void __init kvm_patch_ins_ld(u32 *inst, long addr, u32 rt) +{ +#ifdef CONFIG_64BIT + kvm_patch_ins(inst, KVM_INST_LD | rt | (addr & 0x0000fffc)); +#else + kvm_patch_ins(inst, KVM_INST_LWZ | rt | ((addr + 4) & 0x0000fffc)); +#endif +} + +static void __init kvm_patch_ins_lwz(u32 *inst, long addr, u32 rt) +{ + kvm_patch_ins(inst, KVM_INST_LWZ | rt | (addr & 0x0000ffff)); +} + +static void __init kvm_patch_ins_std(u32 *inst, long addr, u32 rt) +{ +#ifdef CONFIG_64BIT + kvm_patch_ins(inst, KVM_INST_STD | rt | (addr & 0x0000fffc)); +#else + kvm_patch_ins(inst, KVM_INST_STW | rt | ((addr + 4) & 0x0000fffc)); +#endif +} + +static void __init kvm_patch_ins_stw(u32 *inst, long addr, u32 rt) +{ + kvm_patch_ins(inst, KVM_INST_STW | rt | (addr & 0x0000fffc)); +} + +static void __init kvm_patch_ins_nop(u32 *inst) +{ + kvm_patch_ins(inst, KVM_INST_NOP); +} + +static void __init kvm_patch_ins_b(u32 *inst, int addr) +{ +#if defined(CONFIG_RELOCATABLE) && defined(CONFIG_PPC_BOOK3S) + /* On relocatable kernels interrupts handlers and our code + can be in different regions, so we don't patch them */ + + if ((ulong)inst < (ulong)&__end_interrupts) + return; +#endif + + kvm_patch_ins(inst, KVM_INST_B | (addr & KVM_INST_B_MASK)); +} + +static u32 * __init kvm_alloc(int len) +{ + u32 *p; + + if ((kvm_tmp_index + len) > (kvm_tmp_end - kvm_tmp)) { + printk(KERN_ERR "KVM: No more space (%d + %d)\n", + kvm_tmp_index, len); + kvm_patching_worked = false; + return NULL; + } + + p = (void*)&kvm_tmp[kvm_tmp_index]; + kvm_tmp_index += len; + + return p; +} + +extern u32 kvm_emulate_mtmsrd_branch_offs; +extern u32 kvm_emulate_mtmsrd_reg_offs; +extern u32 kvm_emulate_mtmsrd_orig_ins_offs; +extern u32 kvm_emulate_mtmsrd_len; +extern u32 kvm_emulate_mtmsrd[]; + +static void __init kvm_patch_ins_mtmsrd(u32 *inst, u32 rt) +{ + u32 *p; + int distance_start; + int distance_end; + ulong next_inst; + + p = kvm_alloc(kvm_emulate_mtmsrd_len * 4); + if (!p) + return; + + /* Find out where we are and put everything there */ + distance_start = (ulong)p - (ulong)inst; + next_inst = ((ulong)inst + 4); + distance_end = next_inst - (ulong)&p[kvm_emulate_mtmsrd_branch_offs]; + + /* Make sure we only write valid b instructions */ + if (distance_start > KVM_INST_B_MAX) { + kvm_patching_worked = false; + return; + } + + /* Modify the chunk to fit the invocation */ + memcpy(p, kvm_emulate_mtmsrd, kvm_emulate_mtmsrd_len * 4); + p[kvm_emulate_mtmsrd_branch_offs] |= distance_end & KVM_INST_B_MASK; + switch (get_rt(rt)) { + case 30: + kvm_patch_ins_ll(&p[kvm_emulate_mtmsrd_reg_offs], + magic_var(scratch2), KVM_RT_30); + break; + case 31: + kvm_patch_ins_ll(&p[kvm_emulate_mtmsrd_reg_offs], + magic_var(scratch1), KVM_RT_30); + break; + default: + p[kvm_emulate_mtmsrd_reg_offs] |= rt; + break; + } + + p[kvm_emulate_mtmsrd_orig_ins_offs] = *inst; + flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtmsrd_len * 4); + + /* Patch the invocation */ + kvm_patch_ins_b(inst, distance_start); +} + +extern u32 kvm_emulate_mtmsr_branch_offs; +extern u32 kvm_emulate_mtmsr_reg1_offs; +extern u32 kvm_emulate_mtmsr_reg2_offs; +extern u32 kvm_emulate_mtmsr_orig_ins_offs; +extern u32 kvm_emulate_mtmsr_len; +extern u32 kvm_emulate_mtmsr[]; + +static void __init kvm_patch_ins_mtmsr(u32 *inst, u32 rt) +{ + u32 *p; + int distance_start; + int distance_end; + ulong next_inst; + + p = kvm_alloc(kvm_emulate_mtmsr_len * 4); + if (!p) + return; + + /* Find out where we are and put everything there */ + distance_start = (ulong)p - (ulong)inst; + next_inst = ((ulong)inst + 4); + distance_end = next_inst - (ulong)&p[kvm_emulate_mtmsr_branch_offs]; + + /* Make sure we only write valid b instructions */ + if (distance_start > KVM_INST_B_MAX) { + kvm_patching_worked = false; + return; + } + + /* Modify the chunk to fit the invocation */ + memcpy(p, kvm_emulate_mtmsr, kvm_emulate_mtmsr_len * 4); + p[kvm_emulate_mtmsr_branch_offs] |= distance_end & KVM_INST_B_MASK; + + /* Make clobbered registers work too */ + switch (get_rt(rt)) { + case 30: + kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg1_offs], + magic_var(scratch2), KVM_RT_30); + kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg2_offs], + magic_var(scratch2), KVM_RT_30); + break; + case 31: + kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg1_offs], + magic_var(scratch1), KVM_RT_30); + kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg2_offs], + magic_var(scratch1), KVM_RT_30); + break; + default: + p[kvm_emulate_mtmsr_reg1_offs] |= rt; + p[kvm_emulate_mtmsr_reg2_offs] |= rt; + break; + } + + p[kvm_emulate_mtmsr_orig_ins_offs] = *inst; + flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtmsr_len * 4); + + /* Patch the invocation */ + kvm_patch_ins_b(inst, distance_start); +} + +#ifdef CONFIG_BOOKE + +extern u32 kvm_emulate_wrtee_branch_offs; +extern u32 kvm_emulate_wrtee_reg_offs; +extern u32 kvm_emulate_wrtee_orig_ins_offs; +extern u32 kvm_emulate_wrtee_len; +extern u32 kvm_emulate_wrtee[]; + +static void __init kvm_patch_ins_wrtee(u32 *inst, u32 rt, int imm_one) +{ + u32 *p; + int distance_start; + int distance_end; + ulong next_inst; + + p = kvm_alloc(kvm_emulate_wrtee_len * 4); + if (!p) + return; + + /* Find out where we are and put everything there */ + distance_start = (ulong)p - (ulong)inst; + next_inst = ((ulong)inst + 4); + distance_end = next_inst - (ulong)&p[kvm_emulate_wrtee_branch_offs]; + + /* Make sure we only write valid b instructions */ + if (distance_start > KVM_INST_B_MAX) { + kvm_patching_worked = false; + return; + } + + /* Modify the chunk to fit the invocation */ + memcpy(p, kvm_emulate_wrtee, kvm_emulate_wrtee_len * 4); + p[kvm_emulate_wrtee_branch_offs] |= distance_end & KVM_INST_B_MASK; + + if (imm_one) { + p[kvm_emulate_wrtee_reg_offs] = + KVM_INST_LI | __PPC_RT(R30) | MSR_EE; + } else { + /* Make clobbered registers work too */ + switch (get_rt(rt)) { + case 30: + kvm_patch_ins_ll(&p[kvm_emulate_wrtee_reg_offs], + magic_var(scratch2), KVM_RT_30); + break; + case 31: + kvm_patch_ins_ll(&p[kvm_emulate_wrtee_reg_offs], + magic_var(scratch1), KVM_RT_30); + break; + default: + p[kvm_emulate_wrtee_reg_offs] |= rt; + break; + } + } + + p[kvm_emulate_wrtee_orig_ins_offs] = *inst; + flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrtee_len * 4); + + /* Patch the invocation */ + kvm_patch_ins_b(inst, distance_start); +} + +extern u32 kvm_emulate_wrteei_0_branch_offs; +extern u32 kvm_emulate_wrteei_0_len; +extern u32 kvm_emulate_wrteei_0[]; + +static void __init kvm_patch_ins_wrteei_0(u32 *inst) +{ + u32 *p; + int distance_start; + int distance_end; + ulong next_inst; + + p = kvm_alloc(kvm_emulate_wrteei_0_len * 4); + if (!p) + return; + + /* Find out where we are and put everything there */ + distance_start = (ulong)p - (ulong)inst; + next_inst = ((ulong)inst + 4); + distance_end = next_inst - (ulong)&p[kvm_emulate_wrteei_0_branch_offs]; + + /* Make sure we only write valid b instructions */ + if (distance_start > KVM_INST_B_MAX) { + kvm_patching_worked = false; + return; + } + + memcpy(p, kvm_emulate_wrteei_0, kvm_emulate_wrteei_0_len * 4); + p[kvm_emulate_wrteei_0_branch_offs] |= distance_end & KVM_INST_B_MASK; + flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrteei_0_len * 4); + + /* Patch the invocation */ + kvm_patch_ins_b(inst, distance_start); +} + +#endif + +#ifdef CONFIG_PPC_BOOK3S_32 + +extern u32 kvm_emulate_mtsrin_branch_offs; +extern u32 kvm_emulate_mtsrin_reg1_offs; +extern u32 kvm_emulate_mtsrin_reg2_offs; +extern u32 kvm_emulate_mtsrin_orig_ins_offs; +extern u32 kvm_emulate_mtsrin_len; +extern u32 kvm_emulate_mtsrin[]; + +static void __init kvm_patch_ins_mtsrin(u32 *inst, u32 rt, u32 rb) +{ + u32 *p; + int distance_start; + int distance_end; + ulong next_inst; + + p = kvm_alloc(kvm_emulate_mtsrin_len * 4); + if (!p) + return; + + /* Find out where we are and put everything there */ + distance_start = (ulong)p - (ulong)inst; + next_inst = ((ulong)inst + 4); + distance_end = next_inst - (ulong)&p[kvm_emulate_mtsrin_branch_offs]; + + /* Make sure we only write valid b instructions */ + if (distance_start > KVM_INST_B_MAX) { + kvm_patching_worked = false; + return; + } + + /* Modify the chunk to fit the invocation */ + memcpy(p, kvm_emulate_mtsrin, kvm_emulate_mtsrin_len * 4); + p[kvm_emulate_mtsrin_branch_offs] |= distance_end & KVM_INST_B_MASK; + p[kvm_emulate_mtsrin_reg1_offs] |= (rb << 10); + p[kvm_emulate_mtsrin_reg2_offs] |= rt; + p[kvm_emulate_mtsrin_orig_ins_offs] = *inst; + flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtsrin_len * 4); + + /* Patch the invocation */ + kvm_patch_ins_b(inst, distance_start); +} + +#endif + +static void __init kvm_map_magic_page(void *data) +{ + u32 *features = data; + + ulong in[8] = {0}; + ulong out[8]; + + in[0] = KVM_MAGIC_PAGE; + in[1] = KVM_MAGIC_PAGE | MAGIC_PAGE_FLAG_NOT_MAPPED_NX; + + epapr_hypercall(in, out, KVM_HCALL_TOKEN(KVM_HC_PPC_MAP_MAGIC_PAGE)); + + *features = out[0]; +} + +static void __init kvm_check_ins(u32 *inst, u32 features) +{ + u32 _inst = *inst; + u32 inst_no_rt = _inst & ~KVM_MASK_RT; + u32 inst_rt = _inst & KVM_MASK_RT; + + switch (inst_no_rt) { + /* Loads */ + case KVM_INST_MFMSR: + kvm_patch_ins_ld(inst, magic_var(msr), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_SPRG0): + kvm_patch_ins_ld(inst, magic_var(sprg0), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_SPRG1): + kvm_patch_ins_ld(inst, magic_var(sprg1), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_SPRG2): + kvm_patch_ins_ld(inst, magic_var(sprg2), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_SPRG3): + kvm_patch_ins_ld(inst, magic_var(sprg3), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_SRR0): + kvm_patch_ins_ld(inst, magic_var(srr0), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_SRR1): + kvm_patch_ins_ld(inst, magic_var(srr1), inst_rt); + break; +#ifdef CONFIG_BOOKE + case KVM_INST_MFSPR(SPRN_DEAR): +#else + case KVM_INST_MFSPR(SPRN_DAR): +#endif + kvm_patch_ins_ld(inst, magic_var(dar), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_DSISR): + kvm_patch_ins_lwz(inst, magic_var(dsisr), inst_rt); + break; + +#ifdef CONFIG_PPC_E500 + case KVM_INST_MFSPR(SPRN_MAS0): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_lwz(inst, magic_var(mas0), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_MAS1): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_lwz(inst, magic_var(mas1), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_MAS2): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_ld(inst, magic_var(mas2), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_MAS3): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_lwz(inst, magic_var(mas7_3) + 4, inst_rt); + break; + case KVM_INST_MFSPR(SPRN_MAS4): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_lwz(inst, magic_var(mas4), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_MAS6): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_lwz(inst, magic_var(mas6), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_MAS7): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_lwz(inst, magic_var(mas7_3), inst_rt); + break; +#endif /* CONFIG_PPC_E500 */ + + case KVM_INST_MFSPR(SPRN_SPRG4): +#ifdef CONFIG_BOOKE + case KVM_INST_MFSPR(SPRN_SPRG4R): +#endif + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_ld(inst, magic_var(sprg4), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_SPRG5): +#ifdef CONFIG_BOOKE + case KVM_INST_MFSPR(SPRN_SPRG5R): +#endif + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_ld(inst, magic_var(sprg5), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_SPRG6): +#ifdef CONFIG_BOOKE + case KVM_INST_MFSPR(SPRN_SPRG6R): +#endif + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_ld(inst, magic_var(sprg6), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_SPRG7): +#ifdef CONFIG_BOOKE + case KVM_INST_MFSPR(SPRN_SPRG7R): +#endif + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_ld(inst, magic_var(sprg7), inst_rt); + break; + +#ifdef CONFIG_BOOKE + case KVM_INST_MFSPR(SPRN_ESR): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_lwz(inst, magic_var(esr), inst_rt); + break; +#endif + + case KVM_INST_MFSPR(SPRN_PIR): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_lwz(inst, magic_var(pir), inst_rt); + break; + + + /* Stores */ + case KVM_INST_MTSPR(SPRN_SPRG0): + kvm_patch_ins_std(inst, magic_var(sprg0), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_SPRG1): + kvm_patch_ins_std(inst, magic_var(sprg1), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_SPRG2): + kvm_patch_ins_std(inst, magic_var(sprg2), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_SPRG3): + kvm_patch_ins_std(inst, magic_var(sprg3), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_SRR0): + kvm_patch_ins_std(inst, magic_var(srr0), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_SRR1): + kvm_patch_ins_std(inst, magic_var(srr1), inst_rt); + break; +#ifdef CONFIG_BOOKE + case KVM_INST_MTSPR(SPRN_DEAR): +#else + case KVM_INST_MTSPR(SPRN_DAR): +#endif + kvm_patch_ins_std(inst, magic_var(dar), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_DSISR): + kvm_patch_ins_stw(inst, magic_var(dsisr), inst_rt); + break; +#ifdef CONFIG_PPC_E500 + case KVM_INST_MTSPR(SPRN_MAS0): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_stw(inst, magic_var(mas0), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_MAS1): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_stw(inst, magic_var(mas1), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_MAS2): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_std(inst, magic_var(mas2), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_MAS3): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_stw(inst, magic_var(mas7_3) + 4, inst_rt); + break; + case KVM_INST_MTSPR(SPRN_MAS4): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_stw(inst, magic_var(mas4), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_MAS6): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_stw(inst, magic_var(mas6), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_MAS7): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_stw(inst, magic_var(mas7_3), inst_rt); + break; +#endif /* CONFIG_PPC_E500 */ + + case KVM_INST_MTSPR(SPRN_SPRG4): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_std(inst, magic_var(sprg4), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_SPRG5): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_std(inst, magic_var(sprg5), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_SPRG6): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_std(inst, magic_var(sprg6), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_SPRG7): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_std(inst, magic_var(sprg7), inst_rt); + break; + +#ifdef CONFIG_BOOKE + case KVM_INST_MTSPR(SPRN_ESR): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_stw(inst, magic_var(esr), inst_rt); + break; +#endif + + /* Nops */ + case KVM_INST_TLBSYNC: + kvm_patch_ins_nop(inst); + break; + + /* Rewrites */ + case KVM_INST_MTMSRD_L1: + kvm_patch_ins_mtmsrd(inst, inst_rt); + break; + case KVM_INST_MTMSR: + case KVM_INST_MTMSRD_L0: + kvm_patch_ins_mtmsr(inst, inst_rt); + break; +#ifdef CONFIG_BOOKE + case KVM_INST_WRTEE: + kvm_patch_ins_wrtee(inst, inst_rt, 0); + break; +#endif + } + + switch (inst_no_rt & ~KVM_MASK_RB) { +#ifdef CONFIG_PPC_BOOK3S_32 + case KVM_INST_MTSRIN: + if (features & KVM_MAGIC_FEAT_SR) { + u32 inst_rb = _inst & KVM_MASK_RB; + kvm_patch_ins_mtsrin(inst, inst_rt, inst_rb); + } + break; +#endif + } + + switch (_inst) { +#ifdef CONFIG_BOOKE + case KVM_INST_WRTEEI_0: + kvm_patch_ins_wrteei_0(inst); + break; + + case KVM_INST_WRTEEI_1: + kvm_patch_ins_wrtee(inst, 0, 1); + break; +#endif + } +} + +extern u32 kvm_template_start[]; +extern u32 kvm_template_end[]; + +static void __init kvm_use_magic_page(void) +{ + u32 *p; + u32 *start, *end; + u32 features; + + /* Tell the host to map the magic page to -4096 on all CPUs */ + on_each_cpu(kvm_map_magic_page, &features, 1); + + /* Quick self-test to see if the mapping works */ + if (fault_in_readable((const char __user *)KVM_MAGIC_PAGE, + sizeof(u32))) { + kvm_patching_worked = false; + return; + } + + /* Now loop through all code and find instructions */ + start = (void*)_stext; + end = (void*)_etext; + + /* + * Being interrupted in the middle of patching would + * be bad for SPRG4-7, which KVM can't keep in sync + * with emulated accesses because reads don't trap. + */ + local_irq_disable(); + + for (p = start; p < end; p++) { + /* Avoid patching the template code */ + if (p >= kvm_template_start && p < kvm_template_end) { + p = kvm_template_end - 1; + continue; + } + kvm_check_ins(p, features); + } + + local_irq_enable(); + + printk(KERN_INFO "KVM: Live patching for a fast VM %s\n", + kvm_patching_worked ? "worked" : "failed"); +} + +static int __init kvm_guest_init(void) +{ + if (!kvm_para_available()) + return 0; + + if (!epapr_paravirt_enabled) + return 0; + + if (kvm_para_has_feature(KVM_FEATURE_MAGIC_PAGE)) + kvm_use_magic_page(); + +#ifdef CONFIG_PPC_BOOK3S_64 + /* Enable napping */ + powersave_nap = 1; +#endif + + return 0; +} + +postcore_initcall(kvm_guest_init); diff --git a/arch/powerpc/kernel/kvm_emul.S b/arch/powerpc/kernel/kvm_emul.S new file mode 100644 index 000000000..7af6f8b50 --- /dev/null +++ b/arch/powerpc/kernel/kvm_emul.S @@ -0,0 +1,354 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * + * Copyright SUSE Linux Products GmbH 2010 + * Copyright 2010-2011 Freescale Semiconductor, Inc. + * + * Authors: Alexander Graf <agraf@suse.de> + */ + +#include <asm/ppc_asm.h> +#include <asm/kvm_asm.h> +#include <asm/reg.h> +#include <asm/page.h> +#include <asm/asm-offsets.h> +#include <asm/asm-compat.h> + +#define KVM_MAGIC_PAGE (-4096) + +#ifdef CONFIG_64BIT +#define LL64(reg, offs, reg2) ld reg, (offs)(reg2) +#define STL64(reg, offs, reg2) std reg, (offs)(reg2) +#else +#define LL64(reg, offs, reg2) lwz reg, (offs + 4)(reg2) +#define STL64(reg, offs, reg2) stw reg, (offs + 4)(reg2) +#endif + +#define SCRATCH_SAVE \ + /* Enable critical section. We are critical if \ + shared->critical == r1 */ \ + STL64(r1, KVM_MAGIC_PAGE + KVM_MAGIC_CRITICAL, 0); \ + \ + /* Save state */ \ + PPC_STL r31, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH1)(0); \ + PPC_STL r30, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH2)(0); \ + mfcr r31; \ + stw r31, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH3)(0); + +#define SCRATCH_RESTORE \ + /* Restore state */ \ + PPC_LL r31, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH1)(0); \ + lwz r30, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH3)(0); \ + mtcr r30; \ + PPC_LL r30, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH2)(0); \ + \ + /* Disable critical section. We are critical if \ + shared->critical == r1 and r2 is always != r1 */ \ + STL64(r2, KVM_MAGIC_PAGE + KVM_MAGIC_CRITICAL, 0); + +.global kvm_template_start +kvm_template_start: + +.global kvm_emulate_mtmsrd +kvm_emulate_mtmsrd: + + SCRATCH_SAVE + + /* Put MSR & ~(MSR_EE|MSR_RI) in r31 */ + LL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0) + lis r30, (~(MSR_EE | MSR_RI))@h + ori r30, r30, (~(MSR_EE | MSR_RI))@l + and r31, r31, r30 + + /* OR the register's (MSR_EE|MSR_RI) on MSR */ +kvm_emulate_mtmsrd_reg: + ori r30, r0, 0 + andi. r30, r30, (MSR_EE|MSR_RI) + or r31, r31, r30 + + /* Put MSR back into magic page */ + STL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0) + + /* Check if we have to fetch an interrupt */ + lwz r31, (KVM_MAGIC_PAGE + KVM_MAGIC_INT)(0) + cmpwi r31, 0 + beq+ no_check + + /* Check if we may trigger an interrupt */ + andi. r30, r30, MSR_EE + beq no_check + + SCRATCH_RESTORE + + /* Nag hypervisor */ +kvm_emulate_mtmsrd_orig_ins: + tlbsync + + b kvm_emulate_mtmsrd_branch + +no_check: + + SCRATCH_RESTORE + + /* Go back to caller */ +kvm_emulate_mtmsrd_branch: + b . +kvm_emulate_mtmsrd_end: + +.global kvm_emulate_mtmsrd_branch_offs +kvm_emulate_mtmsrd_branch_offs: + .long (kvm_emulate_mtmsrd_branch - kvm_emulate_mtmsrd) / 4 + +.global kvm_emulate_mtmsrd_reg_offs +kvm_emulate_mtmsrd_reg_offs: + .long (kvm_emulate_mtmsrd_reg - kvm_emulate_mtmsrd) / 4 + +.global kvm_emulate_mtmsrd_orig_ins_offs +kvm_emulate_mtmsrd_orig_ins_offs: + .long (kvm_emulate_mtmsrd_orig_ins - kvm_emulate_mtmsrd) / 4 + +.global kvm_emulate_mtmsrd_len +kvm_emulate_mtmsrd_len: + .long (kvm_emulate_mtmsrd_end - kvm_emulate_mtmsrd) / 4 + + +#define MSR_SAFE_BITS (MSR_EE | MSR_RI) +#define MSR_CRITICAL_BITS ~MSR_SAFE_BITS + +.global kvm_emulate_mtmsr +kvm_emulate_mtmsr: + + SCRATCH_SAVE + + /* Fetch old MSR in r31 */ + LL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0) + + /* Find the changed bits between old and new MSR */ +kvm_emulate_mtmsr_reg1: + ori r30, r0, 0 + xor r31, r30, r31 + + /* Check if we need to really do mtmsr */ + LOAD_REG_IMMEDIATE(r30, MSR_CRITICAL_BITS) + and. r31, r31, r30 + + /* No critical bits changed? Maybe we can stay in the guest. */ + beq maybe_stay_in_guest + +do_mtmsr: + + SCRATCH_RESTORE + + /* Just fire off the mtmsr if it's critical */ +kvm_emulate_mtmsr_orig_ins: + mtmsr r0 + + b kvm_emulate_mtmsr_branch + +maybe_stay_in_guest: + + /* Get the target register in r30 */ +kvm_emulate_mtmsr_reg2: + ori r30, r0, 0 + + /* Put MSR into magic page because we don't call mtmsr */ + STL64(r30, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0) + + /* Check if we have to fetch an interrupt */ + lwz r31, (KVM_MAGIC_PAGE + KVM_MAGIC_INT)(0) + cmpwi r31, 0 + beq+ no_mtmsr + + /* Check if we may trigger an interrupt */ + andi. r31, r30, MSR_EE + bne do_mtmsr + +no_mtmsr: + + SCRATCH_RESTORE + + /* Go back to caller */ +kvm_emulate_mtmsr_branch: + b . +kvm_emulate_mtmsr_end: + +.global kvm_emulate_mtmsr_branch_offs +kvm_emulate_mtmsr_branch_offs: + .long (kvm_emulate_mtmsr_branch - kvm_emulate_mtmsr) / 4 + +.global kvm_emulate_mtmsr_reg1_offs +kvm_emulate_mtmsr_reg1_offs: + .long (kvm_emulate_mtmsr_reg1 - kvm_emulate_mtmsr) / 4 + +.global kvm_emulate_mtmsr_reg2_offs +kvm_emulate_mtmsr_reg2_offs: + .long (kvm_emulate_mtmsr_reg2 - kvm_emulate_mtmsr) / 4 + +.global kvm_emulate_mtmsr_orig_ins_offs +kvm_emulate_mtmsr_orig_ins_offs: + .long (kvm_emulate_mtmsr_orig_ins - kvm_emulate_mtmsr) / 4 + +.global kvm_emulate_mtmsr_len +kvm_emulate_mtmsr_len: + .long (kvm_emulate_mtmsr_end - kvm_emulate_mtmsr) / 4 + +#ifdef CONFIG_BOOKE + +/* also used for wrteei 1 */ +.global kvm_emulate_wrtee +kvm_emulate_wrtee: + + SCRATCH_SAVE + + /* Fetch old MSR in r31 */ + LL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0) + + /* Insert new MSR[EE] */ +kvm_emulate_wrtee_reg: + ori r30, r0, 0 + rlwimi r31, r30, 0, MSR_EE + + /* + * If MSR[EE] is now set, check for a pending interrupt. + * We could skip this if MSR[EE] was already on, but that + * should be rare, so don't bother. + */ + andi. r30, r30, MSR_EE + + /* Put MSR into magic page because we don't call wrtee */ + STL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0) + + beq no_wrtee + + /* Check if we have to fetch an interrupt */ + lwz r30, (KVM_MAGIC_PAGE + KVM_MAGIC_INT)(0) + cmpwi r30, 0 + bne do_wrtee + +no_wrtee: + SCRATCH_RESTORE + + /* Go back to caller */ +kvm_emulate_wrtee_branch: + b . + +do_wrtee: + SCRATCH_RESTORE + + /* Just fire off the wrtee if it's critical */ +kvm_emulate_wrtee_orig_ins: + wrtee r0 + + b kvm_emulate_wrtee_branch + +kvm_emulate_wrtee_end: + +.global kvm_emulate_wrtee_branch_offs +kvm_emulate_wrtee_branch_offs: + .long (kvm_emulate_wrtee_branch - kvm_emulate_wrtee) / 4 + +.global kvm_emulate_wrtee_reg_offs +kvm_emulate_wrtee_reg_offs: + .long (kvm_emulate_wrtee_reg - kvm_emulate_wrtee) / 4 + +.global kvm_emulate_wrtee_orig_ins_offs +kvm_emulate_wrtee_orig_ins_offs: + .long (kvm_emulate_wrtee_orig_ins - kvm_emulate_wrtee) / 4 + +.global kvm_emulate_wrtee_len +kvm_emulate_wrtee_len: + .long (kvm_emulate_wrtee_end - kvm_emulate_wrtee) / 4 + +.global kvm_emulate_wrteei_0 +kvm_emulate_wrteei_0: + SCRATCH_SAVE + + /* Fetch old MSR in r31 */ + LL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0) + + /* Remove MSR_EE from old MSR */ + rlwinm r31, r31, 0, ~MSR_EE + + /* Write new MSR value back */ + STL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0) + + SCRATCH_RESTORE + + /* Go back to caller */ +kvm_emulate_wrteei_0_branch: + b . +kvm_emulate_wrteei_0_end: + +.global kvm_emulate_wrteei_0_branch_offs +kvm_emulate_wrteei_0_branch_offs: + .long (kvm_emulate_wrteei_0_branch - kvm_emulate_wrteei_0) / 4 + +.global kvm_emulate_wrteei_0_len +kvm_emulate_wrteei_0_len: + .long (kvm_emulate_wrteei_0_end - kvm_emulate_wrteei_0) / 4 + +#endif /* CONFIG_BOOKE */ + +#ifdef CONFIG_PPC_BOOK3S_32 + +.global kvm_emulate_mtsrin +kvm_emulate_mtsrin: + + SCRATCH_SAVE + + LL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0) + andi. r31, r31, MSR_DR | MSR_IR + beq kvm_emulate_mtsrin_reg1 + + SCRATCH_RESTORE + +kvm_emulate_mtsrin_orig_ins: + nop + b kvm_emulate_mtsrin_branch + +kvm_emulate_mtsrin_reg1: + /* rX >> 26 */ + rlwinm r30,r0,6,26,29 + +kvm_emulate_mtsrin_reg2: + stw r0, (KVM_MAGIC_PAGE + KVM_MAGIC_SR)(r30) + + SCRATCH_RESTORE + + /* Go back to caller */ +kvm_emulate_mtsrin_branch: + b . +kvm_emulate_mtsrin_end: + +.global kvm_emulate_mtsrin_branch_offs +kvm_emulate_mtsrin_branch_offs: + .long (kvm_emulate_mtsrin_branch - kvm_emulate_mtsrin) / 4 + +.global kvm_emulate_mtsrin_reg1_offs +kvm_emulate_mtsrin_reg1_offs: + .long (kvm_emulate_mtsrin_reg1 - kvm_emulate_mtsrin) / 4 + +.global kvm_emulate_mtsrin_reg2_offs +kvm_emulate_mtsrin_reg2_offs: + .long (kvm_emulate_mtsrin_reg2 - kvm_emulate_mtsrin) / 4 + +.global kvm_emulate_mtsrin_orig_ins_offs +kvm_emulate_mtsrin_orig_ins_offs: + .long (kvm_emulate_mtsrin_orig_ins - kvm_emulate_mtsrin) / 4 + +.global kvm_emulate_mtsrin_len +kvm_emulate_mtsrin_len: + .long (kvm_emulate_mtsrin_end - kvm_emulate_mtsrin) / 4 + +#endif /* CONFIG_PPC_BOOK3S_32 */ + + .balign 4 + .global kvm_tmp +kvm_tmp: + .space (64 * 1024) + +.global kvm_tmp_end +kvm_tmp_end: + +.global kvm_template_end +kvm_template_end: diff --git a/arch/powerpc/kernel/l2cr_6xx.S b/arch/powerpc/kernel/l2cr_6xx.S new file mode 100644 index 000000000..f2e03ed42 --- /dev/null +++ b/arch/powerpc/kernel/l2cr_6xx.S @@ -0,0 +1,459 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + L2CR functions + Copyright © 1997-1998 by PowerLogix R & D, Inc. + +*/ +/* + Thur, Dec. 12, 1998. + - First public release, contributed by PowerLogix. + *********** + Sat, Aug. 7, 1999. + - Terry: Made sure code disabled interrupts before running. (Previously + it was assumed interrupts were already disabled). + - Terry: Updated for tentative G4 support. 4MB of memory is now flushed + instead of 2MB. (Prob. only 3 is necessary). + - Terry: Updated for workaround to HID0[DPM] processor bug + during global invalidates. + *********** + Thu, July 13, 2000. + - Terry: Added isync to correct for an errata. + + 22 August 2001. + - DanM: Finally added the 7450 patch I've had for the past + several months. The L2CR is similar, but I'm going + to assume the user of this functions knows what they + are doing. + + Author: Terry Greeniaus (tgree@phys.ualberta.ca) + Please e-mail updates to this file to me, thanks! +*/ +#include <asm/processor.h> +#include <asm/cputable.h> +#include <asm/ppc_asm.h> +#include <asm/cache.h> +#include <asm/page.h> +#include <asm/feature-fixups.h> + +/* Usage: + + When setting the L2CR register, you must do a few special + things. If you are enabling the cache, you must perform a + global invalidate. If you are disabling the cache, you must + flush the cache contents first. This routine takes care of + doing these things. When first enabling the cache, make sure + you pass in the L2CR you want, as well as passing in the + global invalidate bit set. A global invalidate will only be + performed if the L2I bit is set in applyThis. When enabling + the cache, you should also set the L2E bit in applyThis. If + you want to modify the L2CR contents after the cache has been + enabled, the recommended procedure is to first call + __setL2CR(0) to disable the cache and then call it again with + the new values for L2CR. Examples: + + _setL2CR(0) - disables the cache + _setL2CR(0xB3A04000) - enables my G3 upgrade card: + - L2E set to turn on the cache + - L2SIZ set to 1MB + - L2CLK set to 1:1 + - L2RAM set to pipelined synchronous late-write + - L2I set to perform a global invalidation + - L2OH set to 0.5 nS + - L2DF set because this upgrade card + requires it + + A similar call should work for your card. You need to know + the correct setting for your card and then place them in the + fields I have outlined above. Other fields support optional + features, such as L2DO which caches only data, or L2TS which + causes cache pushes from the L1 cache to go to the L2 cache + instead of to main memory. + +IMPORTANT: + Starting with the 7450, the bits in this register have moved + or behave differently. The Enable, Parity Enable, Size, + and L2 Invalidate are the only bits that have not moved. + The size is read-only for these processors with internal L2 + cache, and the invalidate is a control as well as status. + -- Dan + +*/ +/* + * Summary: this procedure ignores the L2I bit in the value passed in, + * flushes the cache if it was already enabled, always invalidates the + * cache, then enables the cache if the L2E bit is set in the value + * passed in. + * -- paulus. + */ +_GLOBAL(_set_L2CR) + /* Make sure this is a 750 or 7400 chip */ +BEGIN_FTR_SECTION + li r3,-1 + blr +END_FTR_SECTION_IFCLR(CPU_FTR_L2CR) + + mflr r9 + + /* Stop DST streams */ +BEGIN_FTR_SECTION + PPC_DSSALL + sync +END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) + + /* Turn off interrupts and data relocation. */ + mfmsr r7 /* Save MSR in r7 */ + rlwinm r4,r7,0,17,15 + rlwinm r4,r4,0,28,26 /* Turn off DR bit */ + sync + mtmsr r4 + isync + + /* Before we perform the global invalidation, we must disable dynamic + * power management via HID0[DPM] to work around a processor bug where + * DPM can possibly interfere with the state machine in the processor + * that invalidates the L2 cache tags. + */ + mfspr r8,SPRN_HID0 /* Save HID0 in r8 */ + rlwinm r4,r8,0,12,10 /* Turn off HID0[DPM] */ + sync + mtspr SPRN_HID0,r4 /* Disable DPM */ + sync + + /* Get the current enable bit of the L2CR into r4 */ + mfspr r4,SPRN_L2CR + + /* Tweak some bits */ + rlwinm r5,r3,0,0,0 /* r5 contains the new enable bit */ + rlwinm r3,r3,0,11,9 /* Turn off the invalidate bit */ + rlwinm r3,r3,0,1,31 /* Turn off the enable bit */ + + /* Check to see if we need to flush */ + rlwinm. r4,r4,0,0,0 + beq 2f + + /* Flush the cache. First, read the first 4MB of memory (physical) to + * put new data in the cache. (Actually we only need + * the size of the L2 cache plus the size of the L1 cache, but 4MB will + * cover everything just to be safe). + */ + + /**** Might be a good idea to set L2DO here - to prevent instructions + from getting into the cache. But since we invalidate + the next time we enable the cache it doesn't really matter. + Don't do this unless you accommodate all processor variations. + The bit moved on the 7450..... + ****/ + +BEGIN_FTR_SECTION + /* Disable L2 prefetch on some 745x and try to ensure + * L2 prefetch engines are idle. As explained by errata + * text, we can't be sure they are, we just hope very hard + * that well be enough (sic !). At least I noticed Apple + * doesn't even bother doing the dcbf's here... + */ + mfspr r4,SPRN_MSSCR0 + rlwinm r4,r4,0,0,29 + sync + mtspr SPRN_MSSCR0,r4 + sync + isync + lis r4,KERNELBASE@h + dcbf 0,r4 + dcbf 0,r4 + dcbf 0,r4 + dcbf 0,r4 +END_FTR_SECTION_IFSET(CPU_FTR_SPEC7450) + + /* TODO: use HW flush assist when available */ + + lis r4,0x0002 + mtctr r4 + li r4,0 +1: + lwzx r0,0,r4 + addi r4,r4,32 /* Go to start of next cache line */ + bdnz 1b + isync + + /* Now, flush the first 4MB of memory */ + lis r4,0x0002 + mtctr r4 + li r4,0 + sync +1: + dcbf 0,r4 + addi r4,r4,32 /* Go to start of next cache line */ + bdnz 1b + +2: + /* Set up the L2CR configuration bits (and switch L2 off) */ + /* CPU errata: Make sure the mtspr below is already in the + * L1 icache + */ + b 20f + .balign L1_CACHE_BYTES +22: + sync + mtspr SPRN_L2CR,r3 + sync + b 23f +20: + b 21f +21: sync + isync + b 22b + +23: + /* Perform a global invalidation */ + oris r3,r3,0x0020 + sync + mtspr SPRN_L2CR,r3 + sync + isync /* For errata */ + +BEGIN_FTR_SECTION + /* On the 7450, we wait for the L2I bit to clear...... + */ +10: mfspr r3,SPRN_L2CR + andis. r4,r3,0x0020 + bne 10b + b 11f +END_FTR_SECTION_IFSET(CPU_FTR_SPEC7450) + + /* Wait for the invalidation to complete */ +3: mfspr r3,SPRN_L2CR + rlwinm. r4,r3,0,31,31 + bne 3b + +11: rlwinm r3,r3,0,11,9 /* Turn off the L2I bit */ + sync + mtspr SPRN_L2CR,r3 + sync + + /* See if we need to enable the cache */ + cmplwi r5,0 + beq 4f + + /* Enable the cache */ + oris r3,r3,0x8000 + mtspr SPRN_L2CR,r3 + sync + + /* Enable L2 HW prefetch on 744x/745x */ +BEGIN_FTR_SECTION + mfspr r3,SPRN_MSSCR0 + ori r3,r3,3 + sync + mtspr SPRN_MSSCR0,r3 + sync + isync +END_FTR_SECTION_IFSET(CPU_FTR_SPEC7450) +4: + + /* Restore HID0[DPM] to whatever it was before */ + sync + mtspr 1008,r8 + sync + + /* Restore MSR (restores EE and DR bits to original state) */ + mtmsr r7 + isync + + mtlr r9 + blr + +_GLOBAL(_get_L2CR) + /* Return the L2CR contents */ + li r3,0 +BEGIN_FTR_SECTION + mfspr r3,SPRN_L2CR +END_FTR_SECTION_IFSET(CPU_FTR_L2CR) + blr + + +/* + * Here is a similar routine for dealing with the L3 cache + * on the 745x family of chips + */ + +_GLOBAL(_set_L3CR) + /* Make sure this is a 745x chip */ +BEGIN_FTR_SECTION + li r3,-1 + blr +END_FTR_SECTION_IFCLR(CPU_FTR_L3CR) + + /* Turn off interrupts and data relocation. */ + mfmsr r7 /* Save MSR in r7 */ + rlwinm r4,r7,0,17,15 + rlwinm r4,r4,0,28,26 /* Turn off DR bit */ + sync + mtmsr r4 + isync + + /* Stop DST streams */ + PPC_DSSALL + sync + + /* Get the current enable bit of the L3CR into r4 */ + mfspr r4,SPRN_L3CR + + /* Tweak some bits */ + rlwinm r5,r3,0,0,0 /* r5 contains the new enable bit */ + rlwinm r3,r3,0,22,20 /* Turn off the invalidate bit */ + rlwinm r3,r3,0,2,31 /* Turn off the enable & PE bits */ + rlwinm r3,r3,0,5,3 /* Turn off the clken bit */ + /* Check to see if we need to flush */ + rlwinm. r4,r4,0,0,0 + beq 2f + + /* Flush the cache. + */ + + /* TODO: use HW flush assist */ + + lis r4,0x0008 + mtctr r4 + li r4,0 +1: + lwzx r0,0,r4 + dcbf 0,r4 + addi r4,r4,32 /* Go to start of next cache line */ + bdnz 1b + +2: + /* Set up the L3CR configuration bits (and switch L3 off) */ + sync + mtspr SPRN_L3CR,r3 + sync + + oris r3,r3,L3CR_L3RES@h /* Set reserved bit 5 */ + mtspr SPRN_L3CR,r3 + sync + oris r3,r3,L3CR_L3CLKEN@h /* Set clken */ + mtspr SPRN_L3CR,r3 + sync + + /* Wait for stabilize */ + li r0,256 + mtctr r0 +1: bdnz 1b + + /* Perform a global invalidation */ + ori r3,r3,0x0400 + sync + mtspr SPRN_L3CR,r3 + sync + isync + + /* We wait for the L3I bit to clear...... */ +10: mfspr r3,SPRN_L3CR + andi. r4,r3,0x0400 + bne 10b + + /* Clear CLKEN */ + rlwinm r3,r3,0,5,3 /* Turn off the clken bit */ + mtspr SPRN_L3CR,r3 + sync + + /* Wait for stabilize */ + li r0,256 + mtctr r0 +1: bdnz 1b + + /* See if we need to enable the cache */ + cmplwi r5,0 + beq 4f + + /* Enable the cache */ + oris r3,r3,(L3CR_L3E | L3CR_L3CLKEN)@h + mtspr SPRN_L3CR,r3 + sync + + /* Wait for stabilize */ + li r0,256 + mtctr r0 +1: bdnz 1b + + /* Restore MSR (restores EE and DR bits to original state) */ +4: + mtmsr r7 + isync + blr + +_GLOBAL(_get_L3CR) + /* Return the L3CR contents */ + li r3,0 +BEGIN_FTR_SECTION + mfspr r3,SPRN_L3CR +END_FTR_SECTION_IFSET(CPU_FTR_L3CR) + blr + +/* --- End of PowerLogix code --- + */ + + +/* flush_disable_L1() - Flush and disable L1 cache + * + * clobbers r0, r3, ctr, cr0 + * Must be called with interrupts disabled and MMU enabled. + */ +_GLOBAL(__flush_disable_L1) + /* Stop pending alitvec streams and memory accesses */ +BEGIN_FTR_SECTION + PPC_DSSALL +END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) + sync + + /* Load counter to 0x4000 cache lines (512k) and + * load cache with datas + */ + li r3,0x4000 /* 512kB / 32B */ + mtctr r3 + lis r3,KERNELBASE@h +1: + lwz r0,0(r3) + addi r3,r3,0x0020 /* Go to start of next cache line */ + bdnz 1b + isync + sync + + /* Now flush those cache lines */ + li r3,0x4000 /* 512kB / 32B */ + mtctr r3 + lis r3,KERNELBASE@h +1: + dcbf 0,r3 + addi r3,r3,0x0020 /* Go to start of next cache line */ + bdnz 1b + sync + + /* We can now disable the L1 cache (HID0:DCE, HID0:ICE) */ + mfspr r3,SPRN_HID0 + rlwinm r3,r3,0,18,15 + mtspr SPRN_HID0,r3 + sync + isync + blr + +/* inval_enable_L1 - Invalidate and enable L1 cache + * + * Assumes L1 is already disabled and MSR:EE is off + * + * clobbers r3 + */ +_GLOBAL(__inval_enable_L1) + /* Enable and then Flash inval the instruction & data cache */ + mfspr r3,SPRN_HID0 + ori r3,r3, HID0_ICE|HID0_ICFI|HID0_DCE|HID0_DCI + sync + isync + mtspr SPRN_HID0,r3 + xori r3,r3, HID0_ICFI|HID0_DCI + mtspr SPRN_HID0,r3 + sync + + blr +_ASM_NOKPROBE_SYMBOL(__inval_enable_L1) + + diff --git a/arch/powerpc/kernel/legacy_serial.c b/arch/powerpc/kernel/legacy_serial.c new file mode 100644 index 000000000..f048c424c --- /dev/null +++ b/arch/powerpc/kernel/legacy_serial.c @@ -0,0 +1,686 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/kernel.h> +#include <linux/serial.h> +#include <linux/serial_8250.h> +#include <linux/serial_core.h> +#include <linux/console.h> +#include <linux/pci.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/of_irq.h> +#include <linux/serial_reg.h> +#include <asm/io.h> +#include <asm/mmu.h> +#include <asm/serial.h> +#include <asm/udbg.h> +#include <asm/pci-bridge.h> +#include <asm/ppc-pci.h> +#include <asm/early_ioremap.h> + +#undef DEBUG + +#ifdef DEBUG +#define DBG(fmt...) do { printk(fmt); } while(0) +#else +#define DBG(fmt...) do { } while(0) +#endif + +#define MAX_LEGACY_SERIAL_PORTS 8 + +static struct plat_serial8250_port +legacy_serial_ports[MAX_LEGACY_SERIAL_PORTS+1]; +static struct legacy_serial_info { + struct device_node *np; + unsigned int speed; + unsigned int clock; + int irq_check_parent; + phys_addr_t taddr; + void __iomem *early_addr; +} legacy_serial_infos[MAX_LEGACY_SERIAL_PORTS]; + +static const struct of_device_id legacy_serial_parents[] __initconst = { + {.type = "soc",}, + {.type = "tsi-bridge",}, + {.type = "opb", }, + {.compatible = "ibm,opb",}, + {.compatible = "simple-bus",}, + {.compatible = "wrs,epld-localbus",}, + {}, +}; + +static unsigned int legacy_serial_count; +static int legacy_serial_console = -1; + +static const upf_t legacy_port_flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | + UPF_SHARE_IRQ | UPF_FIXED_PORT; + +static unsigned int tsi_serial_in(struct uart_port *p, int offset) +{ + unsigned int tmp; + offset = offset << p->regshift; + if (offset == UART_IIR) { + tmp = readl(p->membase + (UART_IIR & ~3)); + return (tmp >> 16) & 0xff; /* UART_IIR % 4 == 2 */ + } else + return readb(p->membase + offset); +} + +static void tsi_serial_out(struct uart_port *p, int offset, int value) +{ + offset = offset << p->regshift; + if (!((offset == UART_IER) && (value & UART_IER_UUE))) + writeb(value, p->membase + offset); +} + +static int __init add_legacy_port(struct device_node *np, int want_index, + int iotype, phys_addr_t base, + phys_addr_t taddr, unsigned long irq, + upf_t flags, int irq_check_parent) +{ + const __be32 *clk, *spd, *rs; + u32 clock = BASE_BAUD * 16; + u32 shift = 0; + int index; + + /* get clock freq. if present */ + clk = of_get_property(np, "clock-frequency", NULL); + if (clk && *clk) + clock = be32_to_cpup(clk); + + /* get default speed if present */ + spd = of_get_property(np, "current-speed", NULL); + + /* get register shift if present */ + rs = of_get_property(np, "reg-shift", NULL); + if (rs && *rs) + shift = be32_to_cpup(rs); + + /* If we have a location index, then try to use it */ + if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS) + index = want_index; + else + index = legacy_serial_count; + + /* if our index is still out of range, that mean that + * array is full, we could scan for a free slot but that + * make little sense to bother, just skip the port + */ + if (index >= MAX_LEGACY_SERIAL_PORTS) + return -1; + if (index >= legacy_serial_count) + legacy_serial_count = index + 1; + + /* Check if there is a port who already claimed our slot */ + if (legacy_serial_infos[index].np != NULL) { + /* if we still have some room, move it, else override */ + if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) { + printk(KERN_DEBUG "Moved legacy port %d -> %d\n", + index, legacy_serial_count); + legacy_serial_ports[legacy_serial_count] = + legacy_serial_ports[index]; + legacy_serial_infos[legacy_serial_count] = + legacy_serial_infos[index]; + legacy_serial_count++; + } else { + printk(KERN_DEBUG "Replacing legacy port %d\n", index); + } + } + + /* Now fill the entry */ + memset(&legacy_serial_ports[index], 0, + sizeof(struct plat_serial8250_port)); + if (iotype == UPIO_PORT) + legacy_serial_ports[index].iobase = base; + else + legacy_serial_ports[index].mapbase = base; + + legacy_serial_ports[index].iotype = iotype; + legacy_serial_ports[index].uartclk = clock; + legacy_serial_ports[index].irq = irq; + legacy_serial_ports[index].flags = flags; + legacy_serial_ports[index].regshift = shift; + legacy_serial_infos[index].taddr = taddr; + legacy_serial_infos[index].np = of_node_get(np); + legacy_serial_infos[index].clock = clock; + legacy_serial_infos[index].speed = spd ? be32_to_cpup(spd) : 0; + legacy_serial_infos[index].irq_check_parent = irq_check_parent; + + if (iotype == UPIO_TSI) { + legacy_serial_ports[index].serial_in = tsi_serial_in; + legacy_serial_ports[index].serial_out = tsi_serial_out; + } + + printk(KERN_DEBUG "Found legacy serial port %d for %pOF\n", + index, np); + printk(KERN_DEBUG " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n", + (iotype == UPIO_PORT) ? "port" : "mem", + (unsigned long long)base, (unsigned long long)taddr, irq, + legacy_serial_ports[index].uartclk, + legacy_serial_infos[index].speed); + + return index; +} + +static int __init add_legacy_soc_port(struct device_node *np, + struct device_node *soc_dev) +{ + u64 addr; + const __be32 *addrp; + struct device_node *tsi = of_get_parent(np); + + /* We only support ports that have a clock frequency properly + * encoded in the device-tree. + */ + if (of_get_property(np, "clock-frequency", NULL) == NULL) + return -1; + + /* if reg-offset don't try to use it */ + if ((of_get_property(np, "reg-offset", NULL) != NULL)) + return -1; + + /* if rtas uses this device, don't try to use it as well */ + if (of_get_property(np, "used-by-rtas", NULL) != NULL) + return -1; + + /* Get the address */ + addrp = of_get_address(soc_dev, 0, NULL, NULL); + if (addrp == NULL) + return -1; + + addr = of_translate_address(soc_dev, addrp); + if (addr == OF_BAD_ADDR) + return -1; + + /* Add port, irq will be dealt with later. We passed a translated + * IO port value. It will be fixed up later along with the irq + */ + if (of_node_is_type(tsi, "tsi-bridge")) + return add_legacy_port(np, -1, UPIO_TSI, addr, addr, + 0, legacy_port_flags, 0); + else + return add_legacy_port(np, -1, UPIO_MEM, addr, addr, + 0, legacy_port_flags, 0); +} + +static int __init add_legacy_isa_port(struct device_node *np, + struct device_node *isa_brg) +{ + const __be32 *reg; + const char *typep; + int index = -1; + u64 taddr; + + DBG(" -> add_legacy_isa_port(%pOF)\n", np); + + /* Get the ISA port number */ + reg = of_get_property(np, "reg", NULL); + if (reg == NULL) + return -1; + + /* Verify it's an IO port, we don't support anything else */ + if (!(be32_to_cpu(reg[0]) & 0x00000001)) + return -1; + + /* Now look for an "ibm,aix-loc" property that gives us ordering + * if any... + */ + typep = of_get_property(np, "ibm,aix-loc", NULL); + + /* If we have a location index, then use it */ + if (typep && *typep == 'S') + index = simple_strtol(typep+1, NULL, 0) - 1; + + /* Translate ISA address. If it fails, we still register the port + * with no translated address so that it can be picked up as an IO + * port later by the serial driver + * + * Note: Don't even try on P8 lpc, we know it's not directly mapped + */ + if (!of_device_is_compatible(isa_brg, "ibm,power8-lpc") || + of_get_property(isa_brg, "ranges", NULL)) { + taddr = of_translate_address(np, reg); + if (taddr == OF_BAD_ADDR) + taddr = 0; + } else + taddr = 0; + + /* Add port, irq will be dealt with later */ + return add_legacy_port(np, index, UPIO_PORT, be32_to_cpu(reg[1]), + taddr, 0, legacy_port_flags, 0); + +} + +#ifdef CONFIG_PCI +static int __init add_legacy_pci_port(struct device_node *np, + struct device_node *pci_dev) +{ + u64 addr, base; + const __be32 *addrp; + unsigned int flags; + int iotype, index = -1, lindex = 0; + + DBG(" -> add_legacy_pci_port(%pOF)\n", np); + + /* We only support ports that have a clock frequency properly + * encoded in the device-tree (that is have an fcode). Anything + * else can't be used that early and will be normally probed by + * the generic 8250_pci driver later on. The reason is that 8250 + * compatible UARTs on PCI need all sort of quirks (port offsets + * etc...) that this code doesn't know about + */ + if (of_get_property(np, "clock-frequency", NULL) == NULL) + return -1; + + /* Get the PCI address. Assume BAR 0 */ + addrp = of_get_pci_address(pci_dev, 0, NULL, &flags); + if (addrp == NULL) + return -1; + + /* We only support BAR 0 for now */ + iotype = (flags & IORESOURCE_MEM) ? UPIO_MEM : UPIO_PORT; + addr = of_translate_address(pci_dev, addrp); + if (addr == OF_BAD_ADDR) + return -1; + + /* Set the IO base to the same as the translated address for MMIO, + * or to the domain local IO base for PIO (it will be fixed up later) + */ + if (iotype == UPIO_MEM) + base = addr; + else + base = of_read_number(&addrp[2], 1); + + /* Try to guess an index... If we have subdevices of the pci dev, + * we get to their "reg" property + */ + if (np != pci_dev) { + const __be32 *reg = of_get_property(np, "reg", NULL); + if (reg && (be32_to_cpup(reg) < 4)) + index = lindex = be32_to_cpup(reg); + } + + /* Local index means it's the Nth port in the PCI chip. Unfortunately + * the offset to add here is device specific. We know about those + * EXAR ports and we default to the most common case. If your UART + * doesn't work for these settings, you'll have to add your own special + * cases here + */ + if (of_device_is_compatible(pci_dev, "pci13a8,152") || + of_device_is_compatible(pci_dev, "pci13a8,154") || + of_device_is_compatible(pci_dev, "pci13a8,158")) { + addr += 0x200 * lindex; + base += 0x200 * lindex; + } else { + addr += 8 * lindex; + base += 8 * lindex; + } + + /* Add port, irq will be dealt with later. We passed a translated + * IO port value. It will be fixed up later along with the irq + */ + return add_legacy_port(np, index, iotype, base, addr, 0, + legacy_port_flags, np != pci_dev); +} +#endif + +static void __init setup_legacy_serial_console(int console) +{ + struct legacy_serial_info *info = &legacy_serial_infos[console]; + struct plat_serial8250_port *port = &legacy_serial_ports[console]; + unsigned int stride; + + stride = 1 << port->regshift; + + /* Check if a translated MMIO address has been found */ + if (info->taddr) { + info->early_addr = early_ioremap(info->taddr, 0x1000); + if (info->early_addr == NULL) + return; + udbg_uart_init_mmio(info->early_addr, stride); + } else { + /* Check if it's PIO and we support untranslated PIO */ + if (port->iotype == UPIO_PORT && isa_io_special) + udbg_uart_init_pio(port->iobase, stride); + else + return; + } + + /* Try to query the current speed */ + if (info->speed == 0) + info->speed = udbg_probe_uart_speed(info->clock); + + /* Set it up */ + DBG("default console speed = %d\n", info->speed); + udbg_uart_setup(info->speed, info->clock); +} + +static int __init ioremap_legacy_serial_console(void) +{ + struct plat_serial8250_port *port; + struct legacy_serial_info *info; + void __iomem *vaddr; + + if (legacy_serial_console < 0) + return 0; + + info = &legacy_serial_infos[legacy_serial_console]; + port = &legacy_serial_ports[legacy_serial_console]; + + if (!info->early_addr) + return 0; + + vaddr = ioremap(info->taddr, 0x1000); + if (WARN_ON(!vaddr)) + return -ENOMEM; + + udbg_uart_init_mmio(vaddr, 1 << port->regshift); + early_iounmap(info->early_addr, 0x1000); + info->early_addr = NULL; + + return 0; +} +early_initcall(ioremap_legacy_serial_console); + +/* + * This is called very early, as part of setup_system() or eventually + * setup_arch(), basically before anything else in this file. This function + * will try to build a list of all the available 8250-compatible serial ports + * in the machine using the Open Firmware device-tree. It currently only deals + * with ISA and PCI busses but could be extended. It allows a very early boot + * console to be initialized, that list is also used later to provide 8250 with + * the machine non-PCI ports and to properly pick the default console port + */ +void __init find_legacy_serial_ports(void) +{ + struct device_node *np, *stdout = NULL; + const char *path; + int index; + + DBG(" -> find_legacy_serial_port()\n"); + + /* Now find out if one of these is out firmware console */ + path = of_get_property(of_chosen, "linux,stdout-path", NULL); + if (path == NULL) + path = of_get_property(of_chosen, "stdout-path", NULL); + if (path != NULL) { + stdout = of_find_node_by_path(path); + if (stdout) + DBG("stdout is %pOF\n", stdout); + } else { + DBG(" no linux,stdout-path !\n"); + } + + /* Iterate over all the 16550 ports, looking for known parents */ + for_each_compatible_node(np, "serial", "ns16550") { + struct device_node *parent = of_get_parent(np); + if (!parent) + continue; + if (of_match_node(legacy_serial_parents, parent) != NULL) { + if (of_device_is_available(np)) { + index = add_legacy_soc_port(np, np); + if (index >= 0 && np == stdout) + legacy_serial_console = index; + } + } + of_node_put(parent); + } + + /* Next, fill our array with ISA ports */ + for_each_node_by_type(np, "serial") { + struct device_node *isa = of_get_parent(np); + if (of_node_name_eq(isa, "isa") || of_node_name_eq(isa, "lpc")) { + if (of_device_is_available(np)) { + index = add_legacy_isa_port(np, isa); + if (index >= 0 && np == stdout) + legacy_serial_console = index; + } + } + of_node_put(isa); + } + +#ifdef CONFIG_PCI + /* Next, try to locate PCI ports */ + for (np = NULL; (np = of_find_all_nodes(np));) { + struct device_node *pci, *parent = of_get_parent(np); + if (of_node_name_eq(parent, "isa")) { + of_node_put(parent); + continue; + } + if (!of_node_name_eq(np, "serial") && + !of_node_is_type(np, "serial")) { + of_node_put(parent); + continue; + } + /* Check for known pciclass, and also check whether we have + * a device with child nodes for ports or not + */ + if (of_device_is_compatible(np, "pciclass,0700") || + of_device_is_compatible(np, "pciclass,070002")) + pci = np; + else if (of_device_is_compatible(parent, "pciclass,0700") || + of_device_is_compatible(parent, "pciclass,070002")) + pci = parent; + else { + of_node_put(parent); + continue; + } + index = add_legacy_pci_port(np, pci); + if (index >= 0 && np == stdout) + legacy_serial_console = index; + of_node_put(parent); + } +#endif + + of_node_put(stdout); + + DBG("legacy_serial_console = %d\n", legacy_serial_console); + if (legacy_serial_console >= 0) + setup_legacy_serial_console(legacy_serial_console); + DBG(" <- find_legacy_serial_port()\n"); +} + +static struct platform_device serial_device = { + .name = "serial8250", + .id = PLAT8250_DEV_PLATFORM, + .dev = { + .platform_data = legacy_serial_ports, + }, +}; + +static void __init fixup_port_irq(int index, + struct device_node *np, + struct plat_serial8250_port *port) +{ + unsigned int virq; + + DBG("fixup_port_irq(%d)\n", index); + + virq = irq_of_parse_and_map(np, 0); + if (!virq && legacy_serial_infos[index].irq_check_parent) { + np = of_get_parent(np); + if (np == NULL) + return; + virq = irq_of_parse_and_map(np, 0); + of_node_put(np); + } + if (!virq) + return; + + port->irq = virq; + +#ifdef CONFIG_SERIAL_8250_FSL + if (of_device_is_compatible(np, "fsl,ns16550")) { + port->handle_irq = fsl8250_handle_irq; + port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE); + } +#endif +} + +static void __init fixup_port_pio(int index, + struct device_node *np, + struct plat_serial8250_port *port) +{ +#ifdef CONFIG_PCI + struct pci_controller *hose; + + DBG("fixup_port_pio(%d)\n", index); + + hose = pci_find_hose_for_OF_device(np); + if (hose) { + unsigned long offset = (unsigned long)hose->io_base_virt - +#ifdef CONFIG_PPC64 + pci_io_base; +#else + isa_io_base; +#endif + DBG("port %d, IO %lx -> %lx\n", + index, port->iobase, port->iobase + offset); + port->iobase += offset; + } +#endif +} + +static void __init fixup_port_mmio(int index, + struct device_node *np, + struct plat_serial8250_port *port) +{ + DBG("fixup_port_mmio(%d)\n", index); + + port->membase = ioremap(port->mapbase, 0x100); +} + +/* + * This is called as an arch initcall, hopefully before the PCI bus is + * probed and/or the 8250 driver loaded since we need to register our + * platform devices before 8250 PCI ones are detected as some of them + * must properly "override" the platform ones. + * + * This function fixes up the interrupt value for platform ports as it + * couldn't be done earlier before interrupt maps have been parsed. It + * also "corrects" the IO address for PIO ports for the same reason, + * since earlier, the PHBs virtual IO space wasn't assigned yet. It then + * registers all those platform ports for use by the 8250 driver when it + * finally loads. + */ +static int __init serial_dev_init(void) +{ + int i; + + if (legacy_serial_count == 0) + return -ENODEV; + + /* + * Before we register the platform serial devices, we need + * to fixup their interrupts and their IO ports. + */ + DBG("Fixing serial ports interrupts and IO ports ...\n"); + + for (i = 0; i < legacy_serial_count; i++) { + struct plat_serial8250_port *port = &legacy_serial_ports[i]; + struct device_node *np = legacy_serial_infos[i].np; + + if (!port->irq) + fixup_port_irq(i, np, port); + if (port->iotype == UPIO_PORT) + fixup_port_pio(i, np, port); + if ((port->iotype == UPIO_MEM) || (port->iotype == UPIO_TSI)) + fixup_port_mmio(i, np, port); + } + + DBG("Registering platform serial ports\n"); + + return platform_device_register(&serial_device); +} +device_initcall(serial_dev_init); + + +#ifdef CONFIG_SERIAL_8250_CONSOLE +/* + * This is called very early, as part of console_init() (typically just after + * time_init()). This function is respondible for trying to find a good + * default console on serial ports. It tries to match the open firmware + * default output with one of the available serial console drivers that have + * been probed earlier by find_legacy_serial_ports() + */ +static int __init check_legacy_serial_console(void) +{ + struct device_node *prom_stdout = NULL; + int i, speed = 0, offset = 0; + const char *name; + const __be32 *spd; + + DBG(" -> check_legacy_serial_console()\n"); + + /* The user has requested a console so this is already set up. */ + if (strstr(boot_command_line, "console=")) { + DBG(" console was specified !\n"); + return -EBUSY; + } + + if (!of_chosen) { + DBG(" of_chosen is NULL !\n"); + return -ENODEV; + } + + if (legacy_serial_console < 0) { + DBG(" legacy_serial_console not found !\n"); + return -ENODEV; + } + /* We are getting a weird phandle from OF ... */ + /* ... So use the full path instead */ + name = of_get_property(of_chosen, "linux,stdout-path", NULL); + if (name == NULL) + name = of_get_property(of_chosen, "stdout-path", NULL); + if (name == NULL) { + DBG(" no stdout-path !\n"); + return -ENODEV; + } + prom_stdout = of_find_node_by_path(name); + if (!prom_stdout) { + DBG(" can't find stdout package %s !\n", name); + return -ENODEV; + } + DBG("stdout is %pOF\n", prom_stdout); + + name = of_get_property(prom_stdout, "name", NULL); + if (!name) { + DBG(" stdout package has no name !\n"); + goto not_found; + } + spd = of_get_property(prom_stdout, "current-speed", NULL); + if (spd) + speed = be32_to_cpup(spd); + + if (strcmp(name, "serial") != 0) + goto not_found; + + /* Look for it in probed array */ + for (i = 0; i < legacy_serial_count; i++) { + if (prom_stdout != legacy_serial_infos[i].np) + continue; + offset = i; + speed = legacy_serial_infos[i].speed; + break; + } + if (i >= legacy_serial_count) + goto not_found; + + of_node_put(prom_stdout); + + DBG("Found serial console at ttyS%d\n", offset); + + if (speed) { + static char __initdata opt[16]; + sprintf(opt, "%d", speed); + return add_preferred_console("ttyS", offset, opt); + } else + return add_preferred_console("ttyS", offset, NULL); + + not_found: + DBG("No preferred console found !\n"); + of_node_put(prom_stdout); + return -ENODEV; +} +console_initcall(check_legacy_serial_console); + +#endif /* CONFIG_SERIAL_8250_CONSOLE */ diff --git a/arch/powerpc/kernel/mce.c b/arch/powerpc/kernel/mce.c new file mode 100644 index 000000000..6c5d30fba --- /dev/null +++ b/arch/powerpc/kernel/mce.c @@ -0,0 +1,767 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Machine check exception handling. + * + * Copyright 2013 IBM Corporation + * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> + */ + +#undef DEBUG +#define pr_fmt(fmt) "mce: " fmt + +#include <linux/hardirq.h> +#include <linux/types.h> +#include <linux/ptrace.h> +#include <linux/percpu.h> +#include <linux/export.h> +#include <linux/irq_work.h> +#include <linux/extable.h> +#include <linux/ftrace.h> +#include <linux/memblock.h> +#include <linux/of.h> + +#include <asm/interrupt.h> +#include <asm/machdep.h> +#include <asm/mce.h> +#include <asm/nmi.h> + +#include "setup.h" + +static void machine_check_ue_event(struct machine_check_event *evt); +static void machine_process_ue_event(struct work_struct *work); + +static DECLARE_WORK(mce_ue_event_work, machine_process_ue_event); + +static BLOCKING_NOTIFIER_HEAD(mce_notifier_list); + +int mce_register_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_register(&mce_notifier_list, nb); +} +EXPORT_SYMBOL_GPL(mce_register_notifier); + +int mce_unregister_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_unregister(&mce_notifier_list, nb); +} +EXPORT_SYMBOL_GPL(mce_unregister_notifier); + +static void mce_set_error_info(struct machine_check_event *mce, + struct mce_error_info *mce_err) +{ + mce->error_type = mce_err->error_type; + switch (mce_err->error_type) { + case MCE_ERROR_TYPE_UE: + mce->u.ue_error.ue_error_type = mce_err->u.ue_error_type; + break; + case MCE_ERROR_TYPE_SLB: + mce->u.slb_error.slb_error_type = mce_err->u.slb_error_type; + break; + case MCE_ERROR_TYPE_ERAT: + mce->u.erat_error.erat_error_type = mce_err->u.erat_error_type; + break; + case MCE_ERROR_TYPE_TLB: + mce->u.tlb_error.tlb_error_type = mce_err->u.tlb_error_type; + break; + case MCE_ERROR_TYPE_USER: + mce->u.user_error.user_error_type = mce_err->u.user_error_type; + break; + case MCE_ERROR_TYPE_RA: + mce->u.ra_error.ra_error_type = mce_err->u.ra_error_type; + break; + case MCE_ERROR_TYPE_LINK: + mce->u.link_error.link_error_type = mce_err->u.link_error_type; + break; + case MCE_ERROR_TYPE_UNKNOWN: + default: + break; + } +} + +void mce_irq_work_queue(void) +{ + /* Raise decrementer interrupt */ + arch_irq_work_raise(); + set_mce_pending_irq_work(); +} + +/* + * Decode and save high level MCE information into per cpu buffer which + * is an array of machine_check_event structure. + */ +void save_mce_event(struct pt_regs *regs, long handled, + struct mce_error_info *mce_err, + uint64_t nip, uint64_t addr, uint64_t phys_addr) +{ + int index = local_paca->mce_info->mce_nest_count++; + struct machine_check_event *mce; + + mce = &local_paca->mce_info->mce_event[index]; + /* + * Return if we don't have enough space to log mce event. + * mce_nest_count may go beyond MAX_MC_EVT but that's ok, + * the check below will stop buffer overrun. + */ + if (index >= MAX_MC_EVT) + return; + + /* Populate generic machine check info */ + mce->version = MCE_V1; + mce->srr0 = nip; + mce->srr1 = regs->msr; + mce->gpr3 = regs->gpr[3]; + mce->in_use = 1; + mce->cpu = get_paca()->paca_index; + + /* Mark it recovered if we have handled it and MSR(RI=1). */ + if (handled && (regs->msr & MSR_RI)) + mce->disposition = MCE_DISPOSITION_RECOVERED; + else + mce->disposition = MCE_DISPOSITION_NOT_RECOVERED; + + mce->initiator = mce_err->initiator; + mce->severity = mce_err->severity; + mce->sync_error = mce_err->sync_error; + mce->error_class = mce_err->error_class; + + /* + * Populate the mce error_type and type-specific error_type. + */ + mce_set_error_info(mce, mce_err); + if (mce->error_type == MCE_ERROR_TYPE_UE) + mce->u.ue_error.ignore_event = mce_err->ignore_event; + + if (!addr) + return; + + if (mce->error_type == MCE_ERROR_TYPE_TLB) { + mce->u.tlb_error.effective_address_provided = true; + mce->u.tlb_error.effective_address = addr; + } else if (mce->error_type == MCE_ERROR_TYPE_SLB) { + mce->u.slb_error.effective_address_provided = true; + mce->u.slb_error.effective_address = addr; + } else if (mce->error_type == MCE_ERROR_TYPE_ERAT) { + mce->u.erat_error.effective_address_provided = true; + mce->u.erat_error.effective_address = addr; + } else if (mce->error_type == MCE_ERROR_TYPE_USER) { + mce->u.user_error.effective_address_provided = true; + mce->u.user_error.effective_address = addr; + } else if (mce->error_type == MCE_ERROR_TYPE_RA) { + mce->u.ra_error.effective_address_provided = true; + mce->u.ra_error.effective_address = addr; + } else if (mce->error_type == MCE_ERROR_TYPE_LINK) { + mce->u.link_error.effective_address_provided = true; + mce->u.link_error.effective_address = addr; + } else if (mce->error_type == MCE_ERROR_TYPE_UE) { + mce->u.ue_error.effective_address_provided = true; + mce->u.ue_error.effective_address = addr; + if (phys_addr != ULONG_MAX) { + mce->u.ue_error.physical_address_provided = true; + mce->u.ue_error.physical_address = phys_addr; + machine_check_ue_event(mce); + } + } + return; +} + +/* + * get_mce_event: + * mce Pointer to machine_check_event structure to be filled. + * release Flag to indicate whether to free the event slot or not. + * 0 <= do not release the mce event. Caller will invoke + * release_mce_event() once event has been consumed. + * 1 <= release the slot. + * + * return 1 = success + * 0 = failure + * + * get_mce_event() will be called by platform specific machine check + * handle routine and in KVM. + * When we call get_mce_event(), we are still in interrupt context and + * preemption will not be scheduled until ret_from_expect() routine + * is called. + */ +int get_mce_event(struct machine_check_event *mce, bool release) +{ + int index = local_paca->mce_info->mce_nest_count - 1; + struct machine_check_event *mc_evt; + int ret = 0; + + /* Sanity check */ + if (index < 0) + return ret; + + /* Check if we have MCE info to process. */ + if (index < MAX_MC_EVT) { + mc_evt = &local_paca->mce_info->mce_event[index]; + /* Copy the event structure and release the original */ + if (mce) + *mce = *mc_evt; + if (release) + mc_evt->in_use = 0; + ret = 1; + } + /* Decrement the count to free the slot. */ + if (release) + local_paca->mce_info->mce_nest_count--; + + return ret; +} + +void release_mce_event(void) +{ + get_mce_event(NULL, true); +} + +static void machine_check_ue_work(void) +{ + schedule_work(&mce_ue_event_work); +} + +/* + * Queue up the MCE event which then can be handled later. + */ +static void machine_check_ue_event(struct machine_check_event *evt) +{ + int index; + + index = local_paca->mce_info->mce_ue_count++; + /* If queue is full, just return for now. */ + if (index >= MAX_MC_EVT) { + local_paca->mce_info->mce_ue_count--; + return; + } + memcpy(&local_paca->mce_info->mce_ue_event_queue[index], + evt, sizeof(*evt)); + + /* Queue work to process this event later. */ + mce_irq_work_queue(); +} + +/* + * Queue up the MCE event which then can be handled later. + */ +void machine_check_queue_event(void) +{ + int index; + struct machine_check_event evt; + + if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) + return; + + index = local_paca->mce_info->mce_queue_count++; + /* If queue is full, just return for now. */ + if (index >= MAX_MC_EVT) { + local_paca->mce_info->mce_queue_count--; + return; + } + memcpy(&local_paca->mce_info->mce_event_queue[index], + &evt, sizeof(evt)); + + mce_irq_work_queue(); +} + +void mce_common_process_ue(struct pt_regs *regs, + struct mce_error_info *mce_err) +{ + const struct exception_table_entry *entry; + + entry = search_kernel_exception_table(regs->nip); + if (entry) { + mce_err->ignore_event = true; + regs_set_return_ip(regs, extable_fixup(entry)); + } +} + +/* + * process pending MCE event from the mce event queue. This function will be + * called during syscall exit. + */ +static void machine_process_ue_event(struct work_struct *work) +{ + int index; + struct machine_check_event *evt; + + while (local_paca->mce_info->mce_ue_count > 0) { + index = local_paca->mce_info->mce_ue_count - 1; + evt = &local_paca->mce_info->mce_ue_event_queue[index]; + blocking_notifier_call_chain(&mce_notifier_list, 0, evt); +#ifdef CONFIG_MEMORY_FAILURE + /* + * This should probably queued elsewhere, but + * oh! well + * + * Don't report this machine check because the caller has a + * asked us to ignore the event, it has a fixup handler which + * will do the appropriate error handling and reporting. + */ + if (evt->error_type == MCE_ERROR_TYPE_UE) { + if (evt->u.ue_error.ignore_event) { + local_paca->mce_info->mce_ue_count--; + continue; + } + + if (evt->u.ue_error.physical_address_provided) { + unsigned long pfn; + + pfn = evt->u.ue_error.physical_address >> + PAGE_SHIFT; + memory_failure(pfn, 0); + } else + pr_warn("Failed to identify bad address from " + "where the uncorrectable error (UE) " + "was generated\n"); + } +#endif + local_paca->mce_info->mce_ue_count--; + } +} +/* + * process pending MCE event from the mce event queue. This function will be + * called during syscall exit. + */ +static void machine_check_process_queued_event(void) +{ + int index; + struct machine_check_event *evt; + + add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE); + + /* + * For now just print it to console. + * TODO: log this error event to FSP or nvram. + */ + while (local_paca->mce_info->mce_queue_count > 0) { + index = local_paca->mce_info->mce_queue_count - 1; + evt = &local_paca->mce_info->mce_event_queue[index]; + + if (evt->error_type == MCE_ERROR_TYPE_UE && + evt->u.ue_error.ignore_event) { + local_paca->mce_info->mce_queue_count--; + continue; + } + machine_check_print_event_info(evt, false, false); + local_paca->mce_info->mce_queue_count--; + } +} + +void set_mce_pending_irq_work(void) +{ + local_paca->mce_pending_irq_work = 1; +} + +void clear_mce_pending_irq_work(void) +{ + local_paca->mce_pending_irq_work = 0; +} + +void mce_run_irq_context_handlers(void) +{ + if (unlikely(local_paca->mce_pending_irq_work)) { + if (ppc_md.machine_check_log_err) + ppc_md.machine_check_log_err(); + machine_check_process_queued_event(); + machine_check_ue_work(); + clear_mce_pending_irq_work(); + } +} + +void machine_check_print_event_info(struct machine_check_event *evt, + bool user_mode, bool in_guest) +{ + const char *level, *sevstr, *subtype, *err_type, *initiator; + uint64_t ea = 0, pa = 0; + int n = 0; + char dar_str[50]; + char pa_str[50]; + static const char *mc_ue_types[] = { + "Indeterminate", + "Instruction fetch", + "Page table walk ifetch", + "Load/Store", + "Page table walk Load/Store", + }; + static const char *mc_slb_types[] = { + "Indeterminate", + "Parity", + "Multihit", + }; + static const char *mc_erat_types[] = { + "Indeterminate", + "Parity", + "Multihit", + }; + static const char *mc_tlb_types[] = { + "Indeterminate", + "Parity", + "Multihit", + }; + static const char *mc_user_types[] = { + "Indeterminate", + "tlbie(l) invalid", + "scv invalid", + }; + static const char *mc_ra_types[] = { + "Indeterminate", + "Instruction fetch (bad)", + "Instruction fetch (foreign/control memory)", + "Page table walk ifetch (bad)", + "Page table walk ifetch (foreign/control memory)", + "Load (bad)", + "Store (bad)", + "Page table walk Load/Store (bad)", + "Page table walk Load/Store (foreign/control memory)", + "Load/Store (foreign/control memory)", + }; + static const char *mc_link_types[] = { + "Indeterminate", + "Instruction fetch (timeout)", + "Page table walk ifetch (timeout)", + "Load (timeout)", + "Store (timeout)", + "Page table walk Load/Store (timeout)", + }; + static const char *mc_error_class[] = { + "Unknown", + "Hardware error", + "Probable Hardware error (some chance of software cause)", + "Software error", + "Probable Software error (some chance of hardware cause)", + }; + + /* Print things out */ + if (evt->version != MCE_V1) { + pr_err("Machine Check Exception, Unknown event version %d !\n", + evt->version); + return; + } + switch (evt->severity) { + case MCE_SEV_NO_ERROR: + level = KERN_INFO; + sevstr = "Harmless"; + break; + case MCE_SEV_WARNING: + level = KERN_WARNING; + sevstr = "Warning"; + break; + case MCE_SEV_SEVERE: + level = KERN_ERR; + sevstr = "Severe"; + break; + case MCE_SEV_FATAL: + default: + level = KERN_ERR; + sevstr = "Fatal"; + break; + } + + switch(evt->initiator) { + case MCE_INITIATOR_CPU: + initiator = "CPU"; + break; + case MCE_INITIATOR_PCI: + initiator = "PCI"; + break; + case MCE_INITIATOR_ISA: + initiator = "ISA"; + break; + case MCE_INITIATOR_MEMORY: + initiator = "Memory"; + break; + case MCE_INITIATOR_POWERMGM: + initiator = "Power Management"; + break; + case MCE_INITIATOR_UNKNOWN: + default: + initiator = "Unknown"; + break; + } + + switch (evt->error_type) { + case MCE_ERROR_TYPE_UE: + err_type = "UE"; + subtype = evt->u.ue_error.ue_error_type < + ARRAY_SIZE(mc_ue_types) ? + mc_ue_types[evt->u.ue_error.ue_error_type] + : "Unknown"; + if (evt->u.ue_error.effective_address_provided) + ea = evt->u.ue_error.effective_address; + if (evt->u.ue_error.physical_address_provided) + pa = evt->u.ue_error.physical_address; + break; + case MCE_ERROR_TYPE_SLB: + err_type = "SLB"; + subtype = evt->u.slb_error.slb_error_type < + ARRAY_SIZE(mc_slb_types) ? + mc_slb_types[evt->u.slb_error.slb_error_type] + : "Unknown"; + if (evt->u.slb_error.effective_address_provided) + ea = evt->u.slb_error.effective_address; + break; + case MCE_ERROR_TYPE_ERAT: + err_type = "ERAT"; + subtype = evt->u.erat_error.erat_error_type < + ARRAY_SIZE(mc_erat_types) ? + mc_erat_types[evt->u.erat_error.erat_error_type] + : "Unknown"; + if (evt->u.erat_error.effective_address_provided) + ea = evt->u.erat_error.effective_address; + break; + case MCE_ERROR_TYPE_TLB: + err_type = "TLB"; + subtype = evt->u.tlb_error.tlb_error_type < + ARRAY_SIZE(mc_tlb_types) ? + mc_tlb_types[evt->u.tlb_error.tlb_error_type] + : "Unknown"; + if (evt->u.tlb_error.effective_address_provided) + ea = evt->u.tlb_error.effective_address; + break; + case MCE_ERROR_TYPE_USER: + err_type = "User"; + subtype = evt->u.user_error.user_error_type < + ARRAY_SIZE(mc_user_types) ? + mc_user_types[evt->u.user_error.user_error_type] + : "Unknown"; + if (evt->u.user_error.effective_address_provided) + ea = evt->u.user_error.effective_address; + break; + case MCE_ERROR_TYPE_RA: + err_type = "Real address"; + subtype = evt->u.ra_error.ra_error_type < + ARRAY_SIZE(mc_ra_types) ? + mc_ra_types[evt->u.ra_error.ra_error_type] + : "Unknown"; + if (evt->u.ra_error.effective_address_provided) + ea = evt->u.ra_error.effective_address; + break; + case MCE_ERROR_TYPE_LINK: + err_type = "Link"; + subtype = evt->u.link_error.link_error_type < + ARRAY_SIZE(mc_link_types) ? + mc_link_types[evt->u.link_error.link_error_type] + : "Unknown"; + if (evt->u.link_error.effective_address_provided) + ea = evt->u.link_error.effective_address; + break; + case MCE_ERROR_TYPE_DCACHE: + err_type = "D-Cache"; + subtype = "Unknown"; + break; + case MCE_ERROR_TYPE_ICACHE: + err_type = "I-Cache"; + subtype = "Unknown"; + break; + default: + case MCE_ERROR_TYPE_UNKNOWN: + err_type = "Unknown"; + subtype = ""; + break; + } + + dar_str[0] = pa_str[0] = '\0'; + if (ea && evt->srr0 != ea) { + /* Load/Store address */ + n = sprintf(dar_str, "DAR: %016llx ", ea); + if (pa) + sprintf(dar_str + n, "paddr: %016llx ", pa); + } else if (pa) { + sprintf(pa_str, " paddr: %016llx", pa); + } + + printk("%sMCE: CPU%d: machine check (%s) %s %s %s %s[%s]\n", + level, evt->cpu, sevstr, in_guest ? "Guest" : "", + err_type, subtype, dar_str, + evt->disposition == MCE_DISPOSITION_RECOVERED ? + "Recovered" : "Not recovered"); + + if (in_guest || user_mode) { + printk("%sMCE: CPU%d: PID: %d Comm: %s %sNIP: [%016llx]%s\n", + level, evt->cpu, current->pid, current->comm, + in_guest ? "Guest " : "", evt->srr0, pa_str); + } else { + printk("%sMCE: CPU%d: NIP: [%016llx] %pS%s\n", + level, evt->cpu, evt->srr0, (void *)evt->srr0, pa_str); + } + + printk("%sMCE: CPU%d: Initiator %s\n", level, evt->cpu, initiator); + + subtype = evt->error_class < ARRAY_SIZE(mc_error_class) ? + mc_error_class[evt->error_class] : "Unknown"; + printk("%sMCE: CPU%d: %s\n", level, evt->cpu, subtype); + +#ifdef CONFIG_PPC_64S_HASH_MMU + /* Display faulty slb contents for SLB errors. */ + if (evt->error_type == MCE_ERROR_TYPE_SLB && !in_guest) + slb_dump_contents(local_paca->mce_faulty_slbs); +#endif +} +EXPORT_SYMBOL_GPL(machine_check_print_event_info); + +/* + * This function is called in real mode. Strictly no printk's please. + * + * regs->nip and regs->msr contains srr0 and ssr1. + */ +DEFINE_INTERRUPT_HANDLER_NMI(machine_check_early) +{ + long handled = 0; + + hv_nmi_check_nonrecoverable(regs); + + /* + * See if platform is capable of handling machine check. + */ + if (ppc_md.machine_check_early) + handled = ppc_md.machine_check_early(regs); + + return handled; +} + +/* Possible meanings for HMER_DEBUG_TRIG bit being set on POWER9 */ +static enum { + DTRIG_UNKNOWN, + DTRIG_VECTOR_CI, /* need to emulate vector CI load instr */ + DTRIG_SUSPEND_ESCAPE, /* need to escape from TM suspend mode */ +} hmer_debug_trig_function; + +static int init_debug_trig_function(void) +{ + int pvr; + struct device_node *cpun; + struct property *prop = NULL; + const char *str; + + /* First look in the device tree */ + preempt_disable(); + cpun = of_get_cpu_node(smp_processor_id(), NULL); + if (cpun) { + of_property_for_each_string(cpun, "ibm,hmi-special-triggers", + prop, str) { + if (strcmp(str, "bit17-vector-ci-load") == 0) + hmer_debug_trig_function = DTRIG_VECTOR_CI; + else if (strcmp(str, "bit17-tm-suspend-escape") == 0) + hmer_debug_trig_function = DTRIG_SUSPEND_ESCAPE; + } + of_node_put(cpun); + } + preempt_enable(); + + /* If we found the property, don't look at PVR */ + if (prop) + goto out; + + pvr = mfspr(SPRN_PVR); + /* Check for POWER9 Nimbus (scale-out) */ + if ((PVR_VER(pvr) == PVR_POWER9) && (pvr & 0xe000) == 0) { + /* DD2.2 and later */ + if ((pvr & 0xfff) >= 0x202) + hmer_debug_trig_function = DTRIG_SUSPEND_ESCAPE; + /* DD2.0 and DD2.1 - used for vector CI load emulation */ + else if ((pvr & 0xfff) >= 0x200) + hmer_debug_trig_function = DTRIG_VECTOR_CI; + } + + out: + switch (hmer_debug_trig_function) { + case DTRIG_VECTOR_CI: + pr_debug("HMI debug trigger used for vector CI load\n"); + break; + case DTRIG_SUSPEND_ESCAPE: + pr_debug("HMI debug trigger used for TM suspend escape\n"); + break; + default: + break; + } + return 0; +} +__initcall(init_debug_trig_function); + +/* + * Handle HMIs that occur as a result of a debug trigger. + * Return values: + * -1 means this is not a HMI cause that we know about + * 0 means no further handling is required + * 1 means further handling is required + */ +long hmi_handle_debugtrig(struct pt_regs *regs) +{ + unsigned long hmer = mfspr(SPRN_HMER); + long ret = 0; + + /* HMER_DEBUG_TRIG bit is used for various workarounds on P9 */ + if (!((hmer & HMER_DEBUG_TRIG) + && hmer_debug_trig_function != DTRIG_UNKNOWN)) + return -1; + + hmer &= ~HMER_DEBUG_TRIG; + /* HMER is a write-AND register */ + mtspr(SPRN_HMER, ~HMER_DEBUG_TRIG); + + switch (hmer_debug_trig_function) { + case DTRIG_VECTOR_CI: + /* + * Now to avoid problems with soft-disable we + * only do the emulation if we are coming from + * host user space + */ + if (regs && user_mode(regs)) + ret = local_paca->hmi_p9_special_emu = 1; + + break; + + default: + break; + } + + /* + * See if any other HMI causes remain to be handled + */ + if (hmer & mfspr(SPRN_HMEER)) + return -1; + + return ret; +} + +/* + * Return values: + */ +DEFINE_INTERRUPT_HANDLER_NMI(hmi_exception_realmode) +{ + int ret; + + local_paca->hmi_irqs++; + + ret = hmi_handle_debugtrig(regs); + if (ret >= 0) + return ret; + + wait_for_subcore_guest_exit(); + + if (ppc_md.hmi_exception_early) + ppc_md.hmi_exception_early(regs); + + wait_for_tb_resync(); + + return 1; +} + +void __init mce_init(void) +{ + struct mce_info *mce_info; + u64 limit; + int i; + + limit = min(ppc64_bolted_size(), ppc64_rma_size); + for_each_possible_cpu(i) { + mce_info = memblock_alloc_try_nid(sizeof(*mce_info), + __alignof__(*mce_info), + MEMBLOCK_LOW_LIMIT, + limit, early_cpu_to_node(i)); + if (!mce_info) + goto err; + paca_ptrs[i]->mce_info = mce_info; + } + return; +err: + panic("Failed to allocate memory for MCE event data\n"); +} diff --git a/arch/powerpc/kernel/mce_power.c b/arch/powerpc/kernel/mce_power.c new file mode 100644 index 000000000..71e8f2a92 --- /dev/null +++ b/arch/powerpc/kernel/mce_power.c @@ -0,0 +1,791 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Machine check exception handling CPU-side for power7 and power8 + * + * Copyright 2013 IBM Corporation + * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> + */ + +#undef DEBUG +#define pr_fmt(fmt) "mce_power: " fmt + +#include <linux/types.h> +#include <linux/ptrace.h> +#include <linux/extable.h> +#include <linux/pgtable.h> +#include <asm/mmu.h> +#include <asm/mce.h> +#include <asm/machdep.h> +#include <asm/pte-walk.h> +#include <asm/sstep.h> +#include <asm/exception-64s.h> +#include <asm/extable.h> +#include <asm/inst.h> + +/* + * Convert an address related to an mm to a PFN. NOTE: we are in real + * mode, we could potentially race with page table updates. + */ +unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr) +{ + pte_t *ptep, pte; + unsigned int shift; + unsigned long pfn, flags; + struct mm_struct *mm; + + if (user_mode(regs)) + mm = current->mm; + else + mm = &init_mm; + + local_irq_save(flags); + ptep = __find_linux_pte(mm->pgd, addr, NULL, &shift); + if (!ptep) { + pfn = ULONG_MAX; + goto out; + } + pte = READ_ONCE(*ptep); + + if (!pte_present(pte) || pte_special(pte)) { + pfn = ULONG_MAX; + goto out; + } + + if (shift <= PAGE_SHIFT) + pfn = pte_pfn(pte); + else { + unsigned long rpnmask = (1ul << shift) - PAGE_SIZE; + pfn = pte_pfn(__pte(pte_val(pte) | (addr & rpnmask))); + } +out: + local_irq_restore(flags); + return pfn; +} + +static bool mce_in_guest(void) +{ +#ifdef CONFIG_KVM_BOOK3S_HANDLER + /* + * If machine check is hit when in guest context or low level KVM + * code, avoid looking up any translations or making any attempts + * to recover, just record the event and pass to KVM. + */ + if (get_paca()->kvm_hstate.in_guest) + return true; +#endif + return false; +} + +/* flush SLBs and reload */ +#ifdef CONFIG_PPC_64S_HASH_MMU +void flush_and_reload_slb(void) +{ + if (early_radix_enabled()) + return; + + /* Invalidate all SLBs */ + slb_flush_all_realmode(); + + /* + * This probably shouldn't happen, but it may be possible it's + * called in early boot before SLB shadows are allocated. + */ + if (!get_slb_shadow()) + return; + + slb_restore_bolted_realmode(); +} +#endif + +void flush_erat(void) +{ +#ifdef CONFIG_PPC_64S_HASH_MMU + if (!early_cpu_has_feature(CPU_FTR_ARCH_300)) { + flush_and_reload_slb(); + return; + } +#endif + asm volatile(PPC_ISA_3_0_INVALIDATE_ERAT : : :"memory"); +} + +#define MCE_FLUSH_SLB 1 +#define MCE_FLUSH_TLB 2 +#define MCE_FLUSH_ERAT 3 + +static int mce_flush(int what) +{ +#ifdef CONFIG_PPC_64S_HASH_MMU + if (what == MCE_FLUSH_SLB) { + flush_and_reload_slb(); + return 1; + } +#endif + if (what == MCE_FLUSH_ERAT) { + flush_erat(); + return 1; + } + if (what == MCE_FLUSH_TLB) { + tlbiel_all(); + return 1; + } + + return 0; +} + +#define SRR1_MC_LOADSTORE(srr1) ((srr1) & PPC_BIT(42)) + +struct mce_ierror_table { + unsigned long srr1_mask; + unsigned long srr1_value; + bool nip_valid; /* nip is a valid indicator of faulting address */ + unsigned int error_type; + unsigned int error_subtype; + unsigned int error_class; + unsigned int initiator; + unsigned int severity; + bool sync_error; +}; + +static const struct mce_ierror_table mce_p7_ierror_table[] = { +{ 0x00000000001c0000, 0x0000000000040000, true, + MCE_ERROR_TYPE_UE, MCE_UE_ERROR_IFETCH, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000001c0000, 0x0000000000080000, true, + MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY, MCE_ECLASS_HARD_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000001c0000, 0x00000000000c0000, true, + MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000000001c0000, 0x0000000000100000, true, + MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_INDETERMINATE, /* BOTH */ + MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000000001c0000, 0x0000000000140000, true, + MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000000001c0000, 0x0000000000180000, true, + MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_IFETCH, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000001c0000, 0x00000000001c0000, true, + MCE_ERROR_TYPE_UE, MCE_UE_ERROR_IFETCH, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0, 0, 0, 0, 0, 0, 0 } }; + +static const struct mce_ierror_table mce_p8_ierror_table[] = { +{ 0x00000000081c0000, 0x0000000000040000, true, + MCE_ERROR_TYPE_UE, MCE_UE_ERROR_IFETCH, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000081c0000, 0x0000000000080000, true, + MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY, MCE_ECLASS_HARD_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000081c0000, 0x00000000000c0000, true, + MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000000081c0000, 0x0000000000100000, true, + MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000000081c0000, 0x0000000000140000, true, + MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000000081c0000, 0x0000000000180000, true, + MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_IFETCH, + MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000081c0000, 0x00000000001c0000, true, + MCE_ERROR_TYPE_UE, MCE_UE_ERROR_IFETCH, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000081c0000, 0x0000000008000000, true, + MCE_ERROR_TYPE_LINK, MCE_LINK_ERROR_IFETCH_TIMEOUT, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000081c0000, 0x0000000008040000, true, + MCE_ERROR_TYPE_LINK,MCE_LINK_ERROR_PAGE_TABLE_WALK_IFETCH_TIMEOUT, + MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0, 0, 0, 0, 0, 0, 0 } }; + +static const struct mce_ierror_table mce_p9_ierror_table[] = { +{ 0x00000000081c0000, 0x0000000000040000, true, + MCE_ERROR_TYPE_UE, MCE_UE_ERROR_IFETCH, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000081c0000, 0x0000000000080000, true, + MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY, MCE_ECLASS_HARD_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000081c0000, 0x00000000000c0000, true, + MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000000081c0000, 0x0000000000100000, true, + MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000000081c0000, 0x0000000000140000, true, + MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000000081c0000, 0x0000000000180000, true, + MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_IFETCH, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000081c0000, 0x00000000001c0000, true, + MCE_ERROR_TYPE_RA, MCE_RA_ERROR_IFETCH_FOREIGN, MCE_ECLASS_SOFTWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000081c0000, 0x0000000008000000, true, + MCE_ERROR_TYPE_LINK, MCE_LINK_ERROR_IFETCH_TIMEOUT, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000081c0000, 0x0000000008040000, true, + MCE_ERROR_TYPE_LINK,MCE_LINK_ERROR_PAGE_TABLE_WALK_IFETCH_TIMEOUT, + MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000081c0000, 0x00000000080c0000, true, + MCE_ERROR_TYPE_RA, MCE_RA_ERROR_IFETCH, MCE_ECLASS_SOFTWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000081c0000, 0x0000000008100000, true, + MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_IFETCH, MCE_ECLASS_SOFTWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000081c0000, 0x0000000008140000, false, + MCE_ERROR_TYPE_RA, MCE_RA_ERROR_STORE, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_FATAL, false }, /* ASYNC is fatal */ +{ 0x00000000081c0000, 0x0000000008180000, false, + MCE_ERROR_TYPE_LINK,MCE_LINK_ERROR_STORE_TIMEOUT, + MCE_INITIATOR_CPU, MCE_SEV_FATAL, false }, /* ASYNC is fatal */ +{ 0x00000000081c0000, 0x00000000081c0000, true, MCE_ECLASS_HARDWARE, + MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_IFETCH_FOREIGN, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0, 0, 0, 0, 0, 0, 0 } }; + +static const struct mce_ierror_table mce_p10_ierror_table[] = { +{ 0x00000000081c0000, 0x0000000000040000, true, + MCE_ERROR_TYPE_UE, MCE_UE_ERROR_IFETCH, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000081c0000, 0x0000000000080000, true, + MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY, MCE_ECLASS_HARD_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000081c0000, 0x00000000000c0000, true, + MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000000081c0000, 0x0000000000100000, true, + MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000000081c0000, 0x0000000000140000, true, + MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000000081c0000, 0x0000000000180000, true, + MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_IFETCH, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000081c0000, 0x00000000001c0000, true, + MCE_ERROR_TYPE_RA, MCE_RA_ERROR_IFETCH_FOREIGN, MCE_ECLASS_SOFTWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000081c0000, 0x0000000008080000, true, + MCE_ERROR_TYPE_USER,MCE_USER_ERROR_SCV, MCE_ECLASS_SOFTWARE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000000081c0000, 0x00000000080c0000, true, + MCE_ERROR_TYPE_RA, MCE_RA_ERROR_IFETCH, MCE_ECLASS_SOFTWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000081c0000, 0x0000000008100000, true, + MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_IFETCH, MCE_ECLASS_SOFTWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000000081c0000, 0x0000000008140000, false, + MCE_ERROR_TYPE_RA, MCE_RA_ERROR_STORE, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_FATAL, false }, /* ASYNC is fatal */ +{ 0x00000000081c0000, 0x00000000081c0000, true, MCE_ECLASS_HARDWARE, + MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_IFETCH_FOREIGN, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0, 0, 0, 0, 0, 0, 0 } }; + +struct mce_derror_table { + unsigned long dsisr_value; + bool dar_valid; /* dar is a valid indicator of faulting address */ + unsigned int error_type; + unsigned int error_subtype; + unsigned int error_class; + unsigned int initiator; + unsigned int severity; + bool sync_error; +}; + +static const struct mce_derror_table mce_p7_derror_table[] = { +{ 0x00008000, false, + MCE_ERROR_TYPE_UE, MCE_UE_ERROR_LOAD_STORE, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00004000, true, + MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_LOAD_STORE, + MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000800, true, + MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000400, true, + MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000080, true, + MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000100, true, + MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY, MCE_ECLASS_HARD_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000040, true, + MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_INDETERMINATE, /* BOTH */ + MCE_ECLASS_HARD_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0, false, 0, 0, 0, 0, 0 } }; + +static const struct mce_derror_table mce_p8_derror_table[] = { +{ 0x00008000, false, + MCE_ERROR_TYPE_UE, MCE_UE_ERROR_LOAD_STORE, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00004000, true, + MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_LOAD_STORE, + MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00002000, true, + MCE_ERROR_TYPE_LINK, MCE_LINK_ERROR_LOAD_TIMEOUT, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00001000, true, + MCE_ERROR_TYPE_LINK, MCE_LINK_ERROR_PAGE_TABLE_WALK_LOAD_STORE_TIMEOUT, + MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000800, true, + MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000400, true, + MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000200, true, + MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT, /* SECONDARY ERAT */ + MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000080, true, + MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT, /* Before PARITY */ + MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000100, true, + MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY, MCE_ECLASS_HARD_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0, false, 0, 0, 0, 0, 0 } }; + +static const struct mce_derror_table mce_p9_derror_table[] = { +{ 0x00008000, false, + MCE_ERROR_TYPE_UE, MCE_UE_ERROR_LOAD_STORE, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00004000, true, + MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_LOAD_STORE, + MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00002000, true, + MCE_ERROR_TYPE_LINK, MCE_LINK_ERROR_LOAD_TIMEOUT, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00001000, true, + MCE_ERROR_TYPE_LINK, MCE_LINK_ERROR_PAGE_TABLE_WALK_LOAD_STORE_TIMEOUT, + MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000800, true, + MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000400, true, + MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000200, false, + MCE_ERROR_TYPE_USER, MCE_USER_ERROR_TLBIE, MCE_ECLASS_SOFTWARE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000080, true, + MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT, /* Before PARITY */ + MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000100, true, + MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY, MCE_ECLASS_HARD_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000040, true, + MCE_ERROR_TYPE_RA, MCE_RA_ERROR_LOAD, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000020, false, + MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_LOAD_STORE, + MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000010, false, + MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_LOAD_STORE_FOREIGN, + MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000008, false, + MCE_ERROR_TYPE_RA, MCE_RA_ERROR_LOAD_STORE_FOREIGN, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0, false, 0, 0, 0, 0, 0 } }; + +static const struct mce_derror_table mce_p10_derror_table[] = { +{ 0x00008000, false, + MCE_ERROR_TYPE_UE, MCE_UE_ERROR_LOAD_STORE, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00004000, true, + MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_LOAD_STORE, + MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000800, true, + MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000400, true, + MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT, MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000200, false, + MCE_ERROR_TYPE_USER, MCE_USER_ERROR_TLBIE, MCE_ECLASS_SOFTWARE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000080, true, + MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT, /* Before PARITY */ + MCE_ECLASS_SOFT_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_WARNING, true }, +{ 0x00000100, true, + MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY, MCE_ECLASS_HARD_INDETERMINATE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000040, true, + MCE_ERROR_TYPE_RA, MCE_RA_ERROR_LOAD, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000020, false, + MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_LOAD_STORE, + MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000010, false, + MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_LOAD_STORE_FOREIGN, + MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0x00000008, false, + MCE_ERROR_TYPE_RA, MCE_RA_ERROR_LOAD_STORE_FOREIGN, MCE_ECLASS_HARDWARE, + MCE_INITIATOR_CPU, MCE_SEV_SEVERE, true }, +{ 0, false, 0, 0, 0, 0, 0 } }; + +static int mce_find_instr_ea_and_phys(struct pt_regs *regs, uint64_t *addr, + uint64_t *phys_addr) +{ + /* + * Carefully look at the NIP to determine + * the instruction to analyse. Reading the NIP + * in real-mode is tricky and can lead to recursive + * faults + */ + ppc_inst_t instr; + unsigned long pfn, instr_addr; + struct instruction_op op; + struct pt_regs tmp = *regs; + + pfn = addr_to_pfn(regs, regs->nip); + if (pfn != ULONG_MAX) { + instr_addr = (pfn << PAGE_SHIFT) + (regs->nip & ~PAGE_MASK); + instr = ppc_inst_read((u32 *)instr_addr); + if (!analyse_instr(&op, &tmp, instr)) { + pfn = addr_to_pfn(regs, op.ea); + *addr = op.ea; + *phys_addr = (pfn << PAGE_SHIFT); + return 0; + } + /* + * analyse_instr() might fail if the instruction + * is not a load/store, although this is unexpected + * for load/store errors or if we got the NIP + * wrong + */ + } + *addr = 0; + return -1; +} + +static int mce_handle_ierror(struct pt_regs *regs, unsigned long srr1, + const struct mce_ierror_table table[], + struct mce_error_info *mce_err, uint64_t *addr, + uint64_t *phys_addr) +{ + int handled = 0; + int i; + + *addr = 0; + + for (i = 0; table[i].srr1_mask; i++) { + if ((srr1 & table[i].srr1_mask) != table[i].srr1_value) + continue; + + if (!mce_in_guest()) { + /* attempt to correct the error */ + switch (table[i].error_type) { + case MCE_ERROR_TYPE_SLB: +#ifdef CONFIG_PPC_64S_HASH_MMU + if (local_paca->in_mce == 1) + slb_save_contents(local_paca->mce_faulty_slbs); +#endif + handled = mce_flush(MCE_FLUSH_SLB); + break; + case MCE_ERROR_TYPE_ERAT: + handled = mce_flush(MCE_FLUSH_ERAT); + break; + case MCE_ERROR_TYPE_TLB: + handled = mce_flush(MCE_FLUSH_TLB); + break; + } + } + + /* now fill in mce_error_info */ + mce_err->error_type = table[i].error_type; + mce_err->error_class = table[i].error_class; + switch (table[i].error_type) { + case MCE_ERROR_TYPE_UE: + mce_err->u.ue_error_type = table[i].error_subtype; + break; + case MCE_ERROR_TYPE_SLB: + mce_err->u.slb_error_type = table[i].error_subtype; + break; + case MCE_ERROR_TYPE_ERAT: + mce_err->u.erat_error_type = table[i].error_subtype; + break; + case MCE_ERROR_TYPE_TLB: + mce_err->u.tlb_error_type = table[i].error_subtype; + break; + case MCE_ERROR_TYPE_USER: + mce_err->u.user_error_type = table[i].error_subtype; + break; + case MCE_ERROR_TYPE_RA: + mce_err->u.ra_error_type = table[i].error_subtype; + break; + case MCE_ERROR_TYPE_LINK: + mce_err->u.link_error_type = table[i].error_subtype; + break; + } + mce_err->sync_error = table[i].sync_error; + mce_err->severity = table[i].severity; + mce_err->initiator = table[i].initiator; + if (table[i].nip_valid && !mce_in_guest()) { + *addr = regs->nip; + if (mce_err->sync_error && + table[i].error_type == MCE_ERROR_TYPE_UE) { + unsigned long pfn; + + if (get_paca()->in_mce < MAX_MCE_DEPTH) { + pfn = addr_to_pfn(regs, regs->nip); + if (pfn != ULONG_MAX) { + *phys_addr = + (pfn << PAGE_SHIFT); + } + } + } + } + return handled; + } + + mce_err->error_type = MCE_ERROR_TYPE_UNKNOWN; + mce_err->error_class = MCE_ECLASS_UNKNOWN; + mce_err->severity = MCE_SEV_SEVERE; + mce_err->initiator = MCE_INITIATOR_CPU; + mce_err->sync_error = true; + + return 0; +} + +static int mce_handle_derror(struct pt_regs *regs, + const struct mce_derror_table table[], + struct mce_error_info *mce_err, uint64_t *addr, + uint64_t *phys_addr) +{ + uint64_t dsisr = regs->dsisr; + int handled = 0; + int found = 0; + int i; + + *addr = 0; + + for (i = 0; table[i].dsisr_value; i++) { + if (!(dsisr & table[i].dsisr_value)) + continue; + + if (!mce_in_guest()) { + /* attempt to correct the error */ + switch (table[i].error_type) { + case MCE_ERROR_TYPE_SLB: +#ifdef CONFIG_PPC_64S_HASH_MMU + if (local_paca->in_mce == 1) + slb_save_contents(local_paca->mce_faulty_slbs); +#endif + if (mce_flush(MCE_FLUSH_SLB)) + handled = 1; + break; + case MCE_ERROR_TYPE_ERAT: + if (mce_flush(MCE_FLUSH_ERAT)) + handled = 1; + break; + case MCE_ERROR_TYPE_TLB: + if (mce_flush(MCE_FLUSH_TLB)) + handled = 1; + break; + } + } + + /* + * Attempt to handle multiple conditions, but only return + * one. Ensure uncorrectable errors are first in the table + * to match. + */ + if (found) + continue; + + /* now fill in mce_error_info */ + mce_err->error_type = table[i].error_type; + mce_err->error_class = table[i].error_class; + switch (table[i].error_type) { + case MCE_ERROR_TYPE_UE: + mce_err->u.ue_error_type = table[i].error_subtype; + break; + case MCE_ERROR_TYPE_SLB: + mce_err->u.slb_error_type = table[i].error_subtype; + break; + case MCE_ERROR_TYPE_ERAT: + mce_err->u.erat_error_type = table[i].error_subtype; + break; + case MCE_ERROR_TYPE_TLB: + mce_err->u.tlb_error_type = table[i].error_subtype; + break; + case MCE_ERROR_TYPE_USER: + mce_err->u.user_error_type = table[i].error_subtype; + break; + case MCE_ERROR_TYPE_RA: + mce_err->u.ra_error_type = table[i].error_subtype; + break; + case MCE_ERROR_TYPE_LINK: + mce_err->u.link_error_type = table[i].error_subtype; + break; + } + mce_err->sync_error = table[i].sync_error; + mce_err->severity = table[i].severity; + mce_err->initiator = table[i].initiator; + if (table[i].dar_valid) + *addr = regs->dar; + else if (mce_err->sync_error && !mce_in_guest() && + table[i].error_type == MCE_ERROR_TYPE_UE) { + /* + * We do a maximum of 4 nested MCE calls, see + * kernel/exception-64s.h + */ + if (get_paca()->in_mce < MAX_MCE_DEPTH) + mce_find_instr_ea_and_phys(regs, addr, + phys_addr); + } + found = 1; + } + + if (found) + return handled; + + mce_err->error_type = MCE_ERROR_TYPE_UNKNOWN; + mce_err->error_class = MCE_ECLASS_UNKNOWN; + mce_err->severity = MCE_SEV_SEVERE; + mce_err->initiator = MCE_INITIATOR_CPU; + mce_err->sync_error = true; + + return 0; +} + +static long mce_handle_ue_error(struct pt_regs *regs, + struct mce_error_info *mce_err) +{ + if (mce_in_guest()) + return 0; + + mce_common_process_ue(regs, mce_err); + if (mce_err->ignore_event) + return 1; + + /* + * On specific SCOM read via MMIO we may get a machine check + * exception with SRR0 pointing inside opal. If that is the + * case OPAL may have recovery address to re-read SCOM data in + * different way and hence we can recover from this MC. + */ + + if (ppc_md.mce_check_early_recovery) { + if (ppc_md.mce_check_early_recovery(regs)) + return 1; + } + + return 0; +} + +static long mce_handle_error(struct pt_regs *regs, + unsigned long srr1, + const struct mce_derror_table dtable[], + const struct mce_ierror_table itable[]) +{ + struct mce_error_info mce_err = { 0 }; + uint64_t addr, phys_addr = ULONG_MAX; + long handled; + + if (SRR1_MC_LOADSTORE(srr1)) + handled = mce_handle_derror(regs, dtable, &mce_err, &addr, + &phys_addr); + else + handled = mce_handle_ierror(regs, srr1, itable, &mce_err, &addr, + &phys_addr); + + if (!handled && mce_err.error_type == MCE_ERROR_TYPE_UE) + handled = mce_handle_ue_error(regs, &mce_err); + + save_mce_event(regs, handled, &mce_err, regs->nip, addr, phys_addr); + + return handled; +} + +long __machine_check_early_realmode_p7(struct pt_regs *regs) +{ + /* P7 DD1 leaves top bits of DSISR undefined */ + regs->dsisr &= 0x0000ffff; + + return mce_handle_error(regs, regs->msr, + mce_p7_derror_table, mce_p7_ierror_table); +} + +long __machine_check_early_realmode_p8(struct pt_regs *regs) +{ + return mce_handle_error(regs, regs->msr, + mce_p8_derror_table, mce_p8_ierror_table); +} + +long __machine_check_early_realmode_p9(struct pt_regs *regs) +{ + unsigned long srr1 = regs->msr; + + /* + * On POWER9 DD2.1 and below, it's possible to get a machine check + * caused by a paste instruction where only DSISR bit 25 is set. This + * will result in the MCE handler seeing an unknown event and the kernel + * crashing. An MCE that occurs like this is spurious, so we don't need + * to do anything in terms of servicing it. If there is something that + * needs to be serviced, the CPU will raise the MCE again with the + * correct DSISR so that it can be serviced properly. So detect this + * case and mark it as handled. + */ + if (SRR1_MC_LOADSTORE(regs->msr) && regs->dsisr == 0x02000000) + return 1; + + /* + * Async machine check due to bad real address from store or foreign + * link time out comes with the load/store bit (PPC bit 42) set in + * SRR1, but the cause comes in SRR1 not DSISR. Clear bit 42 so we're + * directed to the ierror table so it will find the cause (which + * describes it correctly as a store error). + */ + if (SRR1_MC_LOADSTORE(srr1) && + ((srr1 & 0x081c0000) == 0x08140000 || + (srr1 & 0x081c0000) == 0x08180000)) { + srr1 &= ~PPC_BIT(42); + } + + return mce_handle_error(regs, srr1, + mce_p9_derror_table, mce_p9_ierror_table); +} + +long __machine_check_early_realmode_p10(struct pt_regs *regs) +{ + unsigned long srr1 = regs->msr; + + /* + * Async machine check due to bad real address from store comes with + * the load/store bit (PPC bit 42) set in SRR1, but the cause comes in + * SRR1 not DSISR. Clear bit 42 so we're directed to the ierror table + * so it will find the cause (which describes it correctly as a store + * error). + */ + if (SRR1_MC_LOADSTORE(srr1) && + (srr1 & 0x081c0000) == 0x08140000) { + srr1 &= ~PPC_BIT(42); + } + + return mce_handle_error(regs, srr1, + mce_p10_derror_table, mce_p10_ierror_table); +} diff --git a/arch/powerpc/kernel/misc.S b/arch/powerpc/kernel/misc.S new file mode 100644 index 000000000..fb7de3543 --- /dev/null +++ b/arch/powerpc/kernel/misc.S @@ -0,0 +1,118 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * This file contains miscellaneous low-level functions. + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * + * Largely rewritten by Cort Dougan (cort@cs.nmt.edu) + * and Paul Mackerras. + * + * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com) + * + * setjmp/longjmp code by Paul Mackerras. + */ +#include <asm/ppc_asm.h> +#include <asm/unistd.h> +#include <asm/asm-compat.h> +#include <asm/asm-offsets.h> +#include <asm/export.h> + + .text + +/* + * Returns (address we are running at) - (address we were linked at) + * for use before the text and data are mapped to KERNELBASE. + + * add_reloc_offset(x) returns x + reloc_offset(). + */ + +_GLOBAL(reloc_offset) + li r3, 0 +_GLOBAL(add_reloc_offset) + mflr r0 + bcl 20,31,$+4 +1: mflr r5 + PPC_LL r4,(2f-1b)(r5) + subf r5,r4,r5 + add r3,r3,r5 + mtlr r0 + blr +_ASM_NOKPROBE_SYMBOL(reloc_offset) +_ASM_NOKPROBE_SYMBOL(add_reloc_offset) + + .align 3 +2: PPC_LONG 1b + +_GLOBAL(setjmp) + mflr r0 + PPC_STL r0,0(r3) + PPC_STL r1,SZL(r3) + PPC_STL r2,2*SZL(r3) +#ifdef CONFIG_PPC32 + mfcr r12 + stmw r12, 3*SZL(r3) +#else + mfcr r0 + PPC_STL r0,3*SZL(r3) + PPC_STL r13,4*SZL(r3) + PPC_STL r14,5*SZL(r3) + PPC_STL r15,6*SZL(r3) + PPC_STL r16,7*SZL(r3) + PPC_STL r17,8*SZL(r3) + PPC_STL r18,9*SZL(r3) + PPC_STL r19,10*SZL(r3) + PPC_STL r20,11*SZL(r3) + PPC_STL r21,12*SZL(r3) + PPC_STL r22,13*SZL(r3) + PPC_STL r23,14*SZL(r3) + PPC_STL r24,15*SZL(r3) + PPC_STL r25,16*SZL(r3) + PPC_STL r26,17*SZL(r3) + PPC_STL r27,18*SZL(r3) + PPC_STL r28,19*SZL(r3) + PPC_STL r29,20*SZL(r3) + PPC_STL r30,21*SZL(r3) + PPC_STL r31,22*SZL(r3) +#endif + li r3,0 + blr + +_GLOBAL(longjmp) +#ifdef CONFIG_PPC32 + lmw r12, 3*SZL(r3) + mtcrf 0x38, r12 +#else + PPC_LL r13,4*SZL(r3) + PPC_LL r14,5*SZL(r3) + PPC_LL r15,6*SZL(r3) + PPC_LL r16,7*SZL(r3) + PPC_LL r17,8*SZL(r3) + PPC_LL r18,9*SZL(r3) + PPC_LL r19,10*SZL(r3) + PPC_LL r20,11*SZL(r3) + PPC_LL r21,12*SZL(r3) + PPC_LL r22,13*SZL(r3) + PPC_LL r23,14*SZL(r3) + PPC_LL r24,15*SZL(r3) + PPC_LL r25,16*SZL(r3) + PPC_LL r26,17*SZL(r3) + PPC_LL r27,18*SZL(r3) + PPC_LL r28,19*SZL(r3) + PPC_LL r29,20*SZL(r3) + PPC_LL r30,21*SZL(r3) + PPC_LL r31,22*SZL(r3) + PPC_LL r0,3*SZL(r3) + mtcrf 0x38,r0 +#endif + PPC_LL r0,0(r3) + PPC_LL r1,SZL(r3) + PPC_LL r2,2*SZL(r3) + mtlr r0 + mr. r3, r4 + bnelr + li r3, 1 + blr + +_GLOBAL(current_stack_frame) + PPC_LL r3,0(r1) + blr +EXPORT_SYMBOL(current_stack_frame) diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S new file mode 100644 index 000000000..e5127b19f --- /dev/null +++ b/arch/powerpc/kernel/misc_32.S @@ -0,0 +1,390 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * This file contains miscellaneous low-level functions. + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * + * Largely rewritten by Cort Dougan (cort@cs.nmt.edu) + * and Paul Mackerras. + * + */ + +#include <linux/sys.h> +#include <asm/unistd.h> +#include <asm/errno.h> +#include <asm/reg.h> +#include <asm/page.h> +#include <asm/cache.h> +#include <asm/cputable.h> +#include <asm/mmu.h> +#include <asm/ppc_asm.h> +#include <asm/thread_info.h> +#include <asm/asm-offsets.h> +#include <asm/processor.h> +#include <asm/bug.h> +#include <asm/ptrace.h> +#include <asm/export.h> +#include <asm/feature-fixups.h> + + .text + +/* + * This returns the high 64 bits of the product of two 64-bit numbers. + */ +_GLOBAL(mulhdu) + cmpwi r6,0 + cmpwi cr1,r3,0 + mr r10,r4 + mulhwu r4,r4,r5 + beq 1f + mulhwu r0,r10,r6 + mullw r7,r10,r5 + addc r7,r0,r7 + addze r4,r4 +1: beqlr cr1 /* all done if high part of A is 0 */ + mullw r9,r3,r5 + mulhwu r10,r3,r5 + beq 2f + mullw r0,r3,r6 + mulhwu r8,r3,r6 + addc r7,r0,r7 + adde r4,r4,r8 + addze r10,r10 +2: addc r4,r4,r9 + addze r3,r10 + blr + +/* + * reloc_got2 runs through the .got2 section adding an offset + * to each entry. + */ +_GLOBAL(reloc_got2) + mflr r11 + lis r7,__got2_start@ha + addi r7,r7,__got2_start@l + lis r8,__got2_end@ha + addi r8,r8,__got2_end@l + subf r8,r7,r8 + srwi. r8,r8,2 + beqlr + mtctr r8 + bcl 20,31,$+4 +1: mflr r0 + lis r4,1b@ha + addi r4,r4,1b@l + subf r0,r4,r0 + add r7,r0,r7 +2: lwz r0,0(r7) + add r0,r0,r3 + stw r0,0(r7) + addi r7,r7,4 + bdnz 2b + mtlr r11 + blr + +/* + * call_setup_cpu - call the setup_cpu function for this cpu + * r3 = data offset, r24 = cpu number + * + * Setup function is called with: + * r3 = data offset + * r4 = ptr to CPU spec (relocated) + */ +_GLOBAL(call_setup_cpu) + addis r4,r3,cur_cpu_spec@ha + addi r4,r4,cur_cpu_spec@l + lwz r4,0(r4) + add r4,r4,r3 + lwz r5,CPU_SPEC_SETUP(r4) + cmpwi 0,r5,0 + add r5,r5,r3 + beqlr + mtctr r5 + bctr + +#if defined(CONFIG_CPU_FREQ_PMAC) && defined(CONFIG_PPC_BOOK3S_32) + +/* This gets called by via-pmu.c to switch the PLL selection + * on 750fx CPU. This function should really be moved to some + * other place (as most of the cpufreq code in via-pmu + */ +_GLOBAL(low_choose_750fx_pll) + /* Clear MSR:EE */ + mfmsr r7 + rlwinm r0,r7,0,17,15 + mtmsr r0 + + /* If switching to PLL1, disable HID0:BTIC */ + cmplwi cr0,r3,0 + beq 1f + mfspr r5,SPRN_HID0 + rlwinm r5,r5,0,27,25 + sync + mtspr SPRN_HID0,r5 + isync + sync + +1: + /* Calc new HID1 value */ + mfspr r4,SPRN_HID1 /* Build a HID1:PS bit from parameter */ + rlwinm r5,r3,16,15,15 /* Clear out HID1:PS from value read */ + rlwinm r4,r4,0,16,14 /* Could have I used rlwimi here ? */ + or r4,r4,r5 + mtspr SPRN_HID1,r4 + +#ifdef CONFIG_SMP + /* Store new HID1 image */ + lwz r6,TASK_CPU(r2) + slwi r6,r6,2 +#else + li r6, 0 +#endif + addis r6,r6,nap_save_hid1@ha + stw r4,nap_save_hid1@l(r6) + + /* If switching to PLL0, enable HID0:BTIC */ + cmplwi cr0,r3,0 + bne 1f + mfspr r5,SPRN_HID0 + ori r5,r5,HID0_BTIC + sync + mtspr SPRN_HID0,r5 + isync + sync + +1: + /* Return */ + mtmsr r7 + blr + +_GLOBAL(low_choose_7447a_dfs) + /* Clear MSR:EE */ + mfmsr r7 + rlwinm r0,r7,0,17,15 + mtmsr r0 + + /* Calc new HID1 value */ + mfspr r4,SPRN_HID1 + insrwi r4,r3,1,9 /* insert parameter into bit 9 */ + sync + mtspr SPRN_HID1,r4 + sync + isync + + /* Return */ + mtmsr r7 + blr + +#endif /* CONFIG_CPU_FREQ_PMAC && CONFIG_PPC_BOOK3S_32 */ + +#ifdef CONFIG_40x + +/* + * Do an IO access in real mode + */ +_GLOBAL(real_readb) + mfmsr r7 + rlwinm r0,r7,0,~MSR_DR + sync + mtmsr r0 + sync + isync + lbz r3,0(r3) + sync + mtmsr r7 + sync + isync + blr +_ASM_NOKPROBE_SYMBOL(real_readb) + + /* + * Do an IO access in real mode + */ +_GLOBAL(real_writeb) + mfmsr r7 + rlwinm r0,r7,0,~MSR_DR + sync + mtmsr r0 + sync + isync + stb r3,0(r4) + sync + mtmsr r7 + sync + isync + blr +_ASM_NOKPROBE_SYMBOL(real_writeb) + +#endif /* CONFIG_40x */ + +/* + * Copy a whole page. We use the dcbz instruction on the destination + * to reduce memory traffic (it eliminates the unnecessary reads of + * the destination into cache). This requires that the destination + * is cacheable. + */ +#define COPY_16_BYTES \ + lwz r6,4(r4); \ + lwz r7,8(r4); \ + lwz r8,12(r4); \ + lwzu r9,16(r4); \ + stw r6,4(r3); \ + stw r7,8(r3); \ + stw r8,12(r3); \ + stwu r9,16(r3) + +_GLOBAL(copy_page) + rlwinm r5, r3, 0, L1_CACHE_BYTES - 1 + addi r3,r3,-4 + +0: twnei r5, 0 /* WARN if r3 is not cache aligned */ + EMIT_WARN_ENTRY 0b,__FILE__,__LINE__, BUGFLAG_WARNING + + addi r4,r4,-4 + + li r5,4 + +#if MAX_COPY_PREFETCH > 1 + li r0,MAX_COPY_PREFETCH + li r11,4 + mtctr r0 +11: dcbt r11,r4 + addi r11,r11,L1_CACHE_BYTES + bdnz 11b +#else /* MAX_COPY_PREFETCH == 1 */ + dcbt r5,r4 + li r11,L1_CACHE_BYTES+4 +#endif /* MAX_COPY_PREFETCH */ + li r0,PAGE_SIZE/L1_CACHE_BYTES - MAX_COPY_PREFETCH + crclr 4*cr0+eq +2: + mtctr r0 +1: + dcbt r11,r4 + dcbz r5,r3 + COPY_16_BYTES +#if L1_CACHE_BYTES >= 32 + COPY_16_BYTES +#if L1_CACHE_BYTES >= 64 + COPY_16_BYTES + COPY_16_BYTES +#if L1_CACHE_BYTES >= 128 + COPY_16_BYTES + COPY_16_BYTES + COPY_16_BYTES + COPY_16_BYTES +#endif +#endif +#endif + bdnz 1b + beqlr + crnot 4*cr0+eq,4*cr0+eq + li r0,MAX_COPY_PREFETCH + li r11,4 + b 2b +EXPORT_SYMBOL(copy_page) + +/* + * Extended precision shifts. + * + * Updated to be valid for shift counts from 0 to 63 inclusive. + * -- Gabriel + * + * R3/R4 has 64 bit value + * R5 has shift count + * result in R3/R4 + * + * ashrdi3: arithmetic right shift (sign propagation) + * lshrdi3: logical right shift + * ashldi3: left shift + */ +_GLOBAL(__ashrdi3) + subfic r6,r5,32 + srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count + addi r7,r5,32 # could be xori, or addi with -32 + slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count) + rlwinm r8,r7,0,32 # t3 = (count < 32) ? 32 : 0 + sraw r7,r3,r7 # t2 = MSW >> (count-32) + or r4,r4,r6 # LSW |= t1 + slw r7,r7,r8 # t2 = (count < 32) ? 0 : t2 + sraw r3,r3,r5 # MSW = MSW >> count + or r4,r4,r7 # LSW |= t2 + blr +EXPORT_SYMBOL(__ashrdi3) + +_GLOBAL(__ashldi3) + subfic r6,r5,32 + slw r3,r3,r5 # MSW = count > 31 ? 0 : MSW << count + addi r7,r5,32 # could be xori, or addi with -32 + srw r6,r4,r6 # t1 = count > 31 ? 0 : LSW >> (32-count) + slw r7,r4,r7 # t2 = count < 32 ? 0 : LSW << (count-32) + or r3,r3,r6 # MSW |= t1 + slw r4,r4,r5 # LSW = LSW << count + or r3,r3,r7 # MSW |= t2 + blr +EXPORT_SYMBOL(__ashldi3) + +_GLOBAL(__lshrdi3) + subfic r6,r5,32 + srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count + addi r7,r5,32 # could be xori, or addi with -32 + slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count) + srw r7,r3,r7 # t2 = count < 32 ? 0 : MSW >> (count-32) + or r4,r4,r6 # LSW |= t1 + srw r3,r3,r5 # MSW = MSW >> count + or r4,r4,r7 # LSW |= t2 + blr +EXPORT_SYMBOL(__lshrdi3) + +/* + * 64-bit comparison: __cmpdi2(s64 a, s64 b) + * Returns 0 if a < b, 1 if a == b, 2 if a > b. + */ +_GLOBAL(__cmpdi2) + cmpw r3,r5 + li r3,1 + bne 1f + cmplw r4,r6 + beqlr +1: li r3,0 + bltlr + li r3,2 + blr +EXPORT_SYMBOL(__cmpdi2) +/* + * 64-bit comparison: __ucmpdi2(u64 a, u64 b) + * Returns 0 if a < b, 1 if a == b, 2 if a > b. + */ +_GLOBAL(__ucmpdi2) + cmplw r3,r5 + li r3,1 + bne 1f + cmplw r4,r6 + beqlr +1: li r3,0 + bltlr + li r3,2 + blr +EXPORT_SYMBOL(__ucmpdi2) + +_GLOBAL(__bswapdi2) + rotlwi r9,r4,8 + rotlwi r10,r3,8 + rlwimi r9,r4,24,0,7 + rlwimi r10,r3,24,0,7 + rlwimi r9,r4,24,16,23 + rlwimi r10,r3,24,16,23 + mr r3,r9 + mr r4,r10 + blr +EXPORT_SYMBOL(__bswapdi2) + +#ifdef CONFIG_SMP +_GLOBAL(start_secondary_resume) + /* Reset stack */ + rlwinm r1, r1, 0, 0, 31 - THREAD_SHIFT + addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD + li r3,0 + stw r3,0(r1) /* Zero the stack frame pointer */ + bl start_secondary + b . +#endif /* CONFIG_SMP */ diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S new file mode 100644 index 000000000..36184cada --- /dev/null +++ b/arch/powerpc/kernel/misc_64.S @@ -0,0 +1,495 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * This file contains miscellaneous low-level functions. + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * + * Largely rewritten by Cort Dougan (cort@cs.nmt.edu) + * and Paul Mackerras. + * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com) + * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com) + */ + +#include <linux/sys.h> +#include <asm/unistd.h> +#include <asm/errno.h> +#include <asm/processor.h> +#include <asm/page.h> +#include <asm/cache.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/cputable.h> +#include <asm/thread_info.h> +#include <asm/kexec.h> +#include <asm/ptrace.h> +#include <asm/mmu.h> +#include <asm/export.h> +#include <asm/feature-fixups.h> + + .text + +_GLOBAL(__bswapdi2) +EXPORT_SYMBOL(__bswapdi2) + srdi r8,r3,32 + rlwinm r7,r3,8,0xffffffff + rlwimi r7,r3,24,0,7 + rlwinm r9,r8,8,0xffffffff + rlwimi r7,r3,24,16,23 + rlwimi r9,r8,24,0,7 + rlwimi r9,r8,24,16,23 + sldi r7,r7,32 + or r3,r7,r9 + blr + + +#ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX +_GLOBAL(rmci_on) + sync + isync + li r3,0x100 + rldicl r3,r3,32,0 + mfspr r5,SPRN_HID4 + or r5,r5,r3 + sync + mtspr SPRN_HID4,r5 + isync + slbia + isync + sync + blr + +_GLOBAL(rmci_off) + sync + isync + li r3,0x100 + rldicl r3,r3,32,0 + mfspr r5,SPRN_HID4 + andc r5,r5,r3 + sync + mtspr SPRN_HID4,r5 + isync + slbia + isync + sync + blr +#endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */ + +#if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_MAPLE) + +/* + * Do an IO access in real mode + */ +_GLOBAL(real_readb) + mfmsr r7 + ori r0,r7,MSR_DR + xori r0,r0,MSR_DR + sync + mtmsrd r0 + sync + isync + mfspr r6,SPRN_HID4 + rldicl r5,r6,32,0 + ori r5,r5,0x100 + rldicl r5,r5,32,0 + sync + mtspr SPRN_HID4,r5 + isync + slbia + isync + lbz r3,0(r3) + sync + mtspr SPRN_HID4,r6 + isync + slbia + isync + mtmsrd r7 + sync + isync + blr + + /* + * Do an IO access in real mode + */ +_GLOBAL(real_writeb) + mfmsr r7 + ori r0,r7,MSR_DR + xori r0,r0,MSR_DR + sync + mtmsrd r0 + sync + isync + mfspr r6,SPRN_HID4 + rldicl r5,r6,32,0 + ori r5,r5,0x100 + rldicl r5,r5,32,0 + sync + mtspr SPRN_HID4,r5 + isync + slbia + isync + stb r3,0(r4) + sync + mtspr SPRN_HID4,r6 + isync + slbia + isync + mtmsrd r7 + sync + isync + blr +#endif /* defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_MAPLE) */ + +#ifdef CONFIG_PPC_PASEMI + +_GLOBAL(real_205_readb) + mfmsr r7 + ori r0,r7,MSR_DR + xori r0,r0,MSR_DR + sync + mtmsrd r0 + sync + isync + LBZCIX(R3,R0,R3) + isync + mtmsrd r7 + sync + isync + blr + +_GLOBAL(real_205_writeb) + mfmsr r7 + ori r0,r7,MSR_DR + xori r0,r0,MSR_DR + sync + mtmsrd r0 + sync + isync + STBCIX(R3,R0,R4) + isync + mtmsrd r7 + sync + isync + blr + +#endif /* CONFIG_PPC_PASEMI */ + + +#if defined(CONFIG_CPU_FREQ_PMAC64) || defined(CONFIG_CPU_FREQ_MAPLE) +/* + * SCOM access functions for 970 (FX only for now) + * + * unsigned long scom970_read(unsigned int address); + * void scom970_write(unsigned int address, unsigned long value); + * + * The address passed in is the 24 bits register address. This code + * is 970 specific and will not check the status bits, so you should + * know what you are doing. + */ +_GLOBAL(scom970_read) + /* interrupts off */ + mfmsr r4 + ori r0,r4,MSR_EE + xori r0,r0,MSR_EE + mtmsrd r0,1 + + /* rotate 24 bits SCOM address 8 bits left and mask out it's low 8 bits + * (including parity). On current CPUs they must be 0'd, + * and finally or in RW bit + */ + rlwinm r3,r3,8,0,15 + ori r3,r3,0x8000 + + /* do the actual scom read */ + sync + mtspr SPRN_SCOMC,r3 + isync + mfspr r3,SPRN_SCOMD + isync + mfspr r0,SPRN_SCOMC + isync + + /* XXX: fixup result on some buggy 970's (ouch ! we lost a bit, bah + * that's the best we can do). Not implemented yet as we don't use + * the scom on any of the bogus CPUs yet, but may have to be done + * ultimately + */ + + /* restore interrupts */ + mtmsrd r4,1 + blr + + +_GLOBAL(scom970_write) + /* interrupts off */ + mfmsr r5 + ori r0,r5,MSR_EE + xori r0,r0,MSR_EE + mtmsrd r0,1 + + /* rotate 24 bits SCOM address 8 bits left and mask out it's low 8 bits + * (including parity). On current CPUs they must be 0'd. + */ + + rlwinm r3,r3,8,0,15 + + sync + mtspr SPRN_SCOMD,r4 /* write data */ + isync + mtspr SPRN_SCOMC,r3 /* write command */ + isync + mfspr 3,SPRN_SCOMC + isync + + /* restore interrupts */ + mtmsrd r5,1 + blr +#endif /* CONFIG_CPU_FREQ_PMAC64 || CONFIG_CPU_FREQ_MAPLE */ + +/* kexec_wait(phys_cpu) + * + * wait for the flag to change, indicating this kernel is going away but + * the slave code for the next one is at addresses 0 to 100. + * + * This is used by all slaves, even those that did not find a matching + * paca in the secondary startup code. + * + * Physical (hardware) cpu id should be in r3. + */ +_GLOBAL(kexec_wait) + bcl 20,31,$+4 +1: mflr r5 + addi r5,r5,kexec_flag-1b + +99: HMT_LOW +#ifdef CONFIG_KEXEC_CORE /* use no memory without kexec */ + lwz r4,0(r5) + cmpwi 0,r4,0 + beq 99b +#ifdef CONFIG_PPC_BOOK3S_64 + li r10,0x60 + mfmsr r11 + clrrdi r11,r11,1 /* Clear MSR_LE */ + mtsrr0 r10 + mtsrr1 r11 + rfid +#else + /* Create TLB entry in book3e_secondary_core_init */ + li r4,0 + ba 0x60 +#endif +#endif + +/* this can be in text because we won't change it until we are + * running in real anyways + */ +kexec_flag: + .long 0 + + +#ifdef CONFIG_KEXEC_CORE +#ifdef CONFIG_PPC_BOOK3E_64 +/* + * BOOK3E has no real MMU mode, so we have to setup the initial TLB + * for a core to identity map v:0 to p:0. This current implementation + * assumes that 1G is enough for kexec. + */ +kexec_create_tlb: + /* + * Invalidate all non-IPROT TLB entries to avoid any TLB conflict. + * IPROT TLB entries should be >= PAGE_OFFSET and thus not conflict. + */ + PPC_TLBILX_ALL(0,R0) + sync + isync + + mfspr r10,SPRN_TLB1CFG + andi. r10,r10,TLBnCFG_N_ENTRY /* Extract # entries */ + subi r10,r10,1 /* Last entry: no conflict with kernel text */ + lis r9,MAS0_TLBSEL(1)@h + rlwimi r9,r10,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r9) */ + +/* Set up a temp identity mapping v:0 to p:0 and return to it. */ + mtspr SPRN_MAS0,r9 + + lis r9,(MAS1_VALID|MAS1_IPROT)@h + ori r9,r9,(MAS1_TSIZE(BOOK3E_PAGESZ_1GB))@l + mtspr SPRN_MAS1,r9 + + LOAD_REG_IMMEDIATE(r9, 0x0 | MAS2_M_IF_NEEDED) + mtspr SPRN_MAS2,r9 + + LOAD_REG_IMMEDIATE(r9, 0x0 | MAS3_SR | MAS3_SW | MAS3_SX) + mtspr SPRN_MAS3,r9 + li r9,0 + mtspr SPRN_MAS7,r9 + + tlbwe + isync + blr +#endif + +/* kexec_smp_wait(void) + * + * call with interrupts off + * note: this is a terminal routine, it does not save lr + * + * get phys id from paca + * switch to real mode + * mark the paca as no longer used + * join other cpus in kexec_wait(phys_id) + */ +_GLOBAL(kexec_smp_wait) + lhz r3,PACAHWCPUID(r13) + bl real_mode + + li r4,KEXEC_STATE_REAL_MODE + stb r4,PACAKEXECSTATE(r13) + + b kexec_wait + +/* + * switch to real mode (turn mmu off) + * we use the early kernel trick that the hardware ignores bits + * 0 and 1 (big endian) of the effective address in real mode + * + * don't overwrite r3 here, it is live for kexec_wait above. + */ +real_mode: /* assume normal blr return */ +#ifdef CONFIG_PPC_BOOK3E_64 + /* Create an identity mapping. */ + b kexec_create_tlb +#else +1: li r9,MSR_RI + li r10,MSR_DR|MSR_IR + mflr r11 /* return address to SRR0 */ + mfmsr r12 + andc r9,r12,r9 + andc r10,r12,r10 + + mtmsrd r9,1 + mtspr SPRN_SRR1,r10 + mtspr SPRN_SRR0,r11 + rfid +#endif + +/* + * kexec_sequence(newstack, start, image, control, clear_all(), + copy_with_mmu_off) + * + * does the grungy work with stack switching and real mode switches + * also does simple calls to other code + */ + +_GLOBAL(kexec_sequence) + mflr r0 + std r0,16(r1) + + /* switch stacks to newstack -- &kexec_stack.stack */ + stdu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r3) + mr r1,r3 + + li r0,0 + std r0,16(r1) + + /* save regs for local vars on new stack. + * yes, we won't go back, but ... + */ + std r31,-8(r1) + std r30,-16(r1) + std r29,-24(r1) + std r28,-32(r1) + std r27,-40(r1) + std r26,-48(r1) + std r25,-56(r1) + + stdu r1,-STACK_FRAME_OVERHEAD-64(r1) + + /* save args into preserved regs */ + mr r31,r3 /* newstack (both) */ + mr r30,r4 /* start (real) */ + mr r29,r5 /* image (virt) */ + mr r28,r6 /* control, unused */ + mr r27,r7 /* clear_all() fn desc */ + mr r26,r8 /* copy_with_mmu_off */ + lhz r25,PACAHWCPUID(r13) /* get our phys cpu from paca */ + + /* disable interrupts, we are overwriting kernel data next */ +#ifdef CONFIG_PPC_BOOK3E_64 + wrteei 0 +#else + mfmsr r3 + rlwinm r3,r3,0,17,15 + mtmsrd r3,1 +#endif + + /* We need to turn the MMU off unless we are in hash mode + * under a hypervisor + */ + cmpdi r26,0 + beq 1f + bl real_mode +1: + /* copy dest pages, flush whole dest image */ + mr r3,r29 + bl kexec_copy_flush /* (image) */ + + /* turn off mmu now if not done earlier */ + cmpdi r26,0 + bne 1f + bl real_mode + + /* copy 0x100 bytes starting at start to 0 */ +1: li r3,0 + mr r4,r30 /* start, aka phys mem offset */ + li r5,0x100 + li r6,0 + bl copy_and_flush /* (dest, src, copy limit, start offset) */ +1: /* assume normal blr return */ + + /* release other cpus to the new kernel secondary start at 0x60 */ + mflr r5 + li r6,1 + stw r6,kexec_flag-1b(5) + + cmpdi r27,0 + beq 1f + + /* clear out hardware hash page table and tlb */ +#ifdef CONFIG_PPC64_ELF_ABI_V1 + ld r12,0(r27) /* deref function descriptor */ +#else + mr r12,r27 +#endif + mtctr r12 + bctrl /* mmu_hash_ops.hpte_clear_all(void); */ + +/* + * kexec image calling is: + * the first 0x100 bytes of the entry point are copied to 0 + * + * all slaves branch to slave = 0x60 (absolute) + * slave(phys_cpu_id); + * + * master goes to start = entry point + * start(phys_cpu_id, start, 0); + * + * + * a wrapper is needed to call existing kernels, here is an approximate + * description of one method: + * + * v2: (2.6.10) + * start will be near the boot_block (maybe 0x100 bytes before it?) + * it will have a 0x60, which will b to boot_block, where it will wait + * and 0 will store phys into struct boot-block and load r3 from there, + * copy kernel 0-0x100 and tell slaves to back down to 0x60 again + * + * v1: (2.6.9) + * boot block will have all cpus scanning device tree to see if they + * are the boot cpu ????? + * other device tree differences (prop sizes, va vs pa, etc)... + */ +1: mr r3,r25 # my phys cpu + mr r4,r30 # start, aka phys mem offset + mtlr 4 + li r5,0 + blr /* image->start(physid, image->start, 0); */ +#endif /* CONFIG_KEXEC_CORE */ diff --git a/arch/powerpc/kernel/module.c b/arch/powerpc/kernel/module.c new file mode 100644 index 000000000..f6d6ae0a1 --- /dev/null +++ b/arch/powerpc/kernel/module.c @@ -0,0 +1,127 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Kernel module help for powerpc. + Copyright (C) 2001, 2003 Rusty Russell IBM Corporation. + Copyright (C) 2008 Freescale Semiconductor, Inc. + +*/ +#include <linux/elf.h> +#include <linux/moduleloader.h> +#include <linux/err.h> +#include <linux/vmalloc.h> +#include <linux/mm.h> +#include <linux/bug.h> +#include <asm/module.h> +#include <linux/uaccess.h> +#include <asm/firmware.h> +#include <linux/sort.h> +#include <asm/setup.h> +#include <asm/sections.h> + +static LIST_HEAD(module_bug_list); + +static const Elf_Shdr *find_section(const Elf_Ehdr *hdr, + const Elf_Shdr *sechdrs, + const char *name) +{ + char *secstrings; + unsigned int i; + + secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; + for (i = 1; i < hdr->e_shnum; i++) + if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0) + return &sechdrs[i]; + return NULL; +} + +int module_finalize(const Elf_Ehdr *hdr, + const Elf_Shdr *sechdrs, struct module *me) +{ + const Elf_Shdr *sect; + int rc; + + rc = module_finalize_ftrace(me, sechdrs); + if (rc) + return rc; + + /* Apply feature fixups */ + sect = find_section(hdr, sechdrs, "__ftr_fixup"); + if (sect != NULL) + do_feature_fixups(cur_cpu_spec->cpu_features, + (void *)sect->sh_addr, + (void *)sect->sh_addr + sect->sh_size); + + sect = find_section(hdr, sechdrs, "__mmu_ftr_fixup"); + if (sect != NULL) + do_feature_fixups(cur_cpu_spec->mmu_features, + (void *)sect->sh_addr, + (void *)sect->sh_addr + sect->sh_size); + +#ifdef CONFIG_PPC64 + sect = find_section(hdr, sechdrs, "__fw_ftr_fixup"); + if (sect != NULL) + do_feature_fixups(powerpc_firmware_features, + (void *)sect->sh_addr, + (void *)sect->sh_addr + sect->sh_size); +#endif /* CONFIG_PPC64 */ + +#ifdef CONFIG_PPC64_ELF_ABI_V1 + sect = find_section(hdr, sechdrs, ".opd"); + if (sect != NULL) { + me->arch.start_opd = sect->sh_addr; + me->arch.end_opd = sect->sh_addr + sect->sh_size; + } +#endif /* CONFIG_PPC64_ELF_ABI_V1 */ + +#ifdef CONFIG_PPC_BARRIER_NOSPEC + sect = find_section(hdr, sechdrs, "__spec_barrier_fixup"); + if (sect != NULL) + do_barrier_nospec_fixups_range(barrier_nospec_enabled, + (void *)sect->sh_addr, + (void *)sect->sh_addr + sect->sh_size); +#endif /* CONFIG_PPC_BARRIER_NOSPEC */ + + sect = find_section(hdr, sechdrs, "__lwsync_fixup"); + if (sect != NULL) + do_lwsync_fixups(cur_cpu_spec->cpu_features, + (void *)sect->sh_addr, + (void *)sect->sh_addr + sect->sh_size); + + return 0; +} + +static __always_inline void * +__module_alloc(unsigned long size, unsigned long start, unsigned long end, bool nowarn) +{ + pgprot_t prot = strict_module_rwx_enabled() ? PAGE_KERNEL : PAGE_KERNEL_EXEC; + gfp_t gfp = GFP_KERNEL | (nowarn ? __GFP_NOWARN : 0); + + /* + * Don't do huge page allocations for modules yet until more testing + * is done. STRICT_MODULE_RWX may require extra work to support this + * too. + */ + return __vmalloc_node_range(size, 1, start, end, gfp, prot, + VM_FLUSH_RESET_PERMS, + NUMA_NO_NODE, __builtin_return_address(0)); +} + +void *module_alloc(unsigned long size) +{ +#ifdef MODULES_VADDR + unsigned long limit = (unsigned long)_etext - SZ_32M; + void *ptr = NULL; + + BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); + + /* First try within 32M limit from _etext to avoid branch trampolines */ + if (MODULES_VADDR < PAGE_OFFSET && MODULES_END > limit) + ptr = __module_alloc(size, limit, MODULES_END, true); + + if (!ptr) + ptr = __module_alloc(size, MODULES_VADDR, MODULES_END, false); + + return ptr; +#else + return __module_alloc(size, VMALLOC_START, VMALLOC_END, false); +#endif +} diff --git a/arch/powerpc/kernel/module_32.c b/arch/powerpc/kernel/module_32.c new file mode 100644 index 000000000..ea6536171 --- /dev/null +++ b/arch/powerpc/kernel/module_32.c @@ -0,0 +1,341 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Kernel module help for PPC. + Copyright (C) 2001 Rusty Russell. + +*/ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/module.h> +#include <linux/moduleloader.h> +#include <linux/elf.h> +#include <linux/vmalloc.h> +#include <linux/fs.h> +#include <linux/string.h> +#include <linux/kernel.h> +#include <linux/ftrace.h> +#include <linux/cache.h> +#include <linux/bug.h> +#include <linux/sort.h> +#include <asm/setup.h> +#include <asm/code-patching.h> + +/* Count how many different relocations (different symbol, different + addend) */ +static unsigned int count_relocs(const Elf32_Rela *rela, unsigned int num) +{ + unsigned int i, r_info, r_addend, _count_relocs; + + _count_relocs = 0; + r_info = 0; + r_addend = 0; + for (i = 0; i < num; i++) + /* Only count 24-bit relocs, others don't need stubs */ + if (ELF32_R_TYPE(rela[i].r_info) == R_PPC_REL24 && + (r_info != ELF32_R_SYM(rela[i].r_info) || + r_addend != rela[i].r_addend)) { + _count_relocs++; + r_info = ELF32_R_SYM(rela[i].r_info); + r_addend = rela[i].r_addend; + } + +#ifdef CONFIG_DYNAMIC_FTRACE + _count_relocs++; /* add one for ftrace_caller */ +#endif + return _count_relocs; +} + +static int relacmp(const void *_x, const void *_y) +{ + const Elf32_Rela *x, *y; + + y = (Elf32_Rela *)_x; + x = (Elf32_Rela *)_y; + + /* Compare the entire r_info (as opposed to ELF32_R_SYM(r_info) only) to + * make the comparison cheaper/faster. It won't affect the sorting or + * the counting algorithms' performance + */ + if (x->r_info < y->r_info) + return -1; + else if (x->r_info > y->r_info) + return 1; + else if (x->r_addend < y->r_addend) + return -1; + else if (x->r_addend > y->r_addend) + return 1; + else + return 0; +} + +/* Get the potential trampolines size required of the init and + non-init sections */ +static unsigned long get_plt_size(const Elf32_Ehdr *hdr, + const Elf32_Shdr *sechdrs, + const char *secstrings, + int is_init) +{ + unsigned long ret = 0; + unsigned i; + + /* Everything marked ALLOC (this includes the exported + symbols) */ + for (i = 1; i < hdr->e_shnum; i++) { + /* If it's called *.init*, and we're not init, we're + not interested */ + if ((strstr(secstrings + sechdrs[i].sh_name, ".init") != NULL) + != is_init) + continue; + + /* We don't want to look at debug sections. */ + if (strstr(secstrings + sechdrs[i].sh_name, ".debug")) + continue; + + if (sechdrs[i].sh_type == SHT_RELA) { + pr_debug("Found relocations in section %u\n", i); + pr_debug("Ptr: %p. Number: %u\n", + (void *)hdr + sechdrs[i].sh_offset, + sechdrs[i].sh_size / sizeof(Elf32_Rela)); + + /* Sort the relocation information based on a symbol and + * addend key. This is a stable O(n*log n) complexity + * algorithm but it will reduce the complexity of + * count_relocs() to linear complexity O(n) + */ + sort((void *)hdr + sechdrs[i].sh_offset, + sechdrs[i].sh_size / sizeof(Elf32_Rela), + sizeof(Elf32_Rela), relacmp, NULL); + + ret += count_relocs((void *)hdr + + sechdrs[i].sh_offset, + sechdrs[i].sh_size + / sizeof(Elf32_Rela)) + * sizeof(struct ppc_plt_entry); + } + } + + return ret; +} + +int module_frob_arch_sections(Elf32_Ehdr *hdr, + Elf32_Shdr *sechdrs, + char *secstrings, + struct module *me) +{ + unsigned int i; + + /* Find .plt and .init.plt sections */ + for (i = 0; i < hdr->e_shnum; i++) { + if (strcmp(secstrings + sechdrs[i].sh_name, ".init.plt") == 0) + me->arch.init_plt_section = i; + else if (strcmp(secstrings + sechdrs[i].sh_name, ".plt") == 0) + me->arch.core_plt_section = i; + } + if (!me->arch.core_plt_section || !me->arch.init_plt_section) { + pr_err("Module doesn't contain .plt or .init.plt sections.\n"); + return -ENOEXEC; + } + + /* Override their sizes */ + sechdrs[me->arch.core_plt_section].sh_size + = get_plt_size(hdr, sechdrs, secstrings, 0); + sechdrs[me->arch.init_plt_section].sh_size + = get_plt_size(hdr, sechdrs, secstrings, 1); + return 0; +} + +static inline int entry_matches(struct ppc_plt_entry *entry, Elf32_Addr val) +{ + if (entry->jump[0] != PPC_RAW_LIS(_R12, PPC_HA(val))) + return 0; + if (entry->jump[1] != PPC_RAW_ADDI(_R12, _R12, PPC_LO(val))) + return 0; + return 1; +} + +/* Set up a trampoline in the PLT to bounce us to the distant function */ +static uint32_t do_plt_call(void *location, + Elf32_Addr val, + const Elf32_Shdr *sechdrs, + struct module *mod) +{ + struct ppc_plt_entry *entry; + + pr_debug("Doing plt for call to 0x%x at 0x%x\n", val, (unsigned int)location); + /* Init, or core PLT? */ + if (location >= mod->core_layout.base + && location < mod->core_layout.base + mod->core_layout.size) + entry = (void *)sechdrs[mod->arch.core_plt_section].sh_addr; + else + entry = (void *)sechdrs[mod->arch.init_plt_section].sh_addr; + + /* Find this entry, or if that fails, the next avail. entry */ + while (entry->jump[0]) { + if (entry_matches(entry, val)) return (uint32_t)entry; + entry++; + } + + if (patch_instruction(&entry->jump[0], ppc_inst(PPC_RAW_LIS(_R12, PPC_HA(val))))) + return 0; + if (patch_instruction(&entry->jump[1], ppc_inst(PPC_RAW_ADDI(_R12, _R12, PPC_LO(val))))) + return 0; + if (patch_instruction(&entry->jump[2], ppc_inst(PPC_RAW_MTCTR(_R12)))) + return 0; + if (patch_instruction(&entry->jump[3], ppc_inst(PPC_RAW_BCTR()))) + return 0; + + pr_debug("Initialized plt for 0x%x at %p\n", val, entry); + return (uint32_t)entry; +} + +static int patch_location_16(uint32_t *loc, u16 value) +{ + loc = PTR_ALIGN_DOWN(loc, sizeof(u32)); + return patch_instruction(loc, ppc_inst((*loc & 0xffff0000) | value)); +} + +int apply_relocate_add(Elf32_Shdr *sechdrs, + const char *strtab, + unsigned int symindex, + unsigned int relsec, + struct module *module) +{ + unsigned int i; + Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; + Elf32_Sym *sym; + uint32_t *location; + uint32_t value; + + pr_debug("Applying ADD relocate section %u to %u\n", relsec, + sechdrs[relsec].sh_info); + for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) { + /* This is where to make the change */ + location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + + rela[i].r_offset; + /* This is the symbol it is referring to. Note that all + undefined symbols have been resolved. */ + sym = (Elf32_Sym *)sechdrs[symindex].sh_addr + + ELF32_R_SYM(rela[i].r_info); + /* `Everything is relative'. */ + value = sym->st_value + rela[i].r_addend; + + switch (ELF32_R_TYPE(rela[i].r_info)) { + case R_PPC_ADDR32: + /* Simply set it */ + *(uint32_t *)location = value; + break; + + case R_PPC_ADDR16_LO: + /* Low half of the symbol */ + if (patch_location_16(location, PPC_LO(value))) + return -EFAULT; + break; + + case R_PPC_ADDR16_HI: + /* Higher half of the symbol */ + if (patch_location_16(location, PPC_HI(value))) + return -EFAULT; + break; + + case R_PPC_ADDR16_HA: + if (patch_location_16(location, PPC_HA(value))) + return -EFAULT; + break; + + case R_PPC_REL24: + if ((int)(value - (uint32_t)location) < -0x02000000 + || (int)(value - (uint32_t)location) >= 0x02000000) { + value = do_plt_call(location, value, + sechdrs, module); + if (!value) + return -EFAULT; + } + + /* Only replace bits 2 through 26 */ + pr_debug("REL24 value = %08X. location = %08X\n", + value, (uint32_t)location); + pr_debug("Location before: %08X.\n", + *(uint32_t *)location); + value = (*(uint32_t *)location & ~PPC_LI_MASK) | + PPC_LI(value - (uint32_t)location); + + if (patch_instruction(location, ppc_inst(value))) + return -EFAULT; + + pr_debug("Location after: %08X.\n", + *(uint32_t *)location); + pr_debug("ie. jump to %08X+%08X = %08X\n", + *(uint32_t *)PPC_LI((uint32_t)location), (uint32_t)location, + (*(uint32_t *)PPC_LI((uint32_t)location)) + (uint32_t)location); + break; + + case R_PPC_REL32: + /* 32-bit relative jump. */ + *(uint32_t *)location = value - (uint32_t)location; + break; + + default: + pr_err("%s: unknown ADD relocation: %u\n", + module->name, + ELF32_R_TYPE(rela[i].r_info)); + return -ENOEXEC; + } + } + + return 0; +} + +#ifdef CONFIG_DYNAMIC_FTRACE +notrace int module_trampoline_target(struct module *mod, unsigned long addr, + unsigned long *target) +{ + ppc_inst_t jmp[4]; + + /* Find where the trampoline jumps to */ + if (copy_inst_from_kernel_nofault(jmp, (void *)addr)) + return -EFAULT; + if (__copy_inst_from_kernel_nofault(jmp + 1, (void *)addr + 4)) + return -EFAULT; + if (__copy_inst_from_kernel_nofault(jmp + 2, (void *)addr + 8)) + return -EFAULT; + if (__copy_inst_from_kernel_nofault(jmp + 3, (void *)addr + 12)) + return -EFAULT; + + /* verify that this is what we expect it to be */ + if ((ppc_inst_val(jmp[0]) & 0xffff0000) != PPC_RAW_LIS(_R12, 0)) + return -EINVAL; + if ((ppc_inst_val(jmp[1]) & 0xffff0000) != PPC_RAW_ADDI(_R12, _R12, 0)) + return -EINVAL; + if (ppc_inst_val(jmp[2]) != PPC_RAW_MTCTR(_R12)) + return -EINVAL; + if (ppc_inst_val(jmp[3]) != PPC_RAW_BCTR()) + return -EINVAL; + + addr = (ppc_inst_val(jmp[1]) & 0xffff) | ((ppc_inst_val(jmp[0]) & 0xffff) << 16); + if (addr & 0x8000) + addr -= 0x10000; + + *target = addr; + + return 0; +} + +int module_finalize_ftrace(struct module *module, const Elf_Shdr *sechdrs) +{ + module->arch.tramp = do_plt_call(module->core_layout.base, + (unsigned long)ftrace_caller, + sechdrs, module); + if (!module->arch.tramp) + return -ENOENT; + +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS + module->arch.tramp_regs = do_plt_call(module->core_layout.base, + (unsigned long)ftrace_regs_caller, + sechdrs, module); + if (!module->arch.tramp_regs) + return -ENOENT; +#endif + + return 0; +} +#endif diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c new file mode 100644 index 000000000..7e45dc98d --- /dev/null +++ b/arch/powerpc/kernel/module_64.c @@ -0,0 +1,799 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Kernel module help for PPC64. + Copyright (C) 2001, 2003 Rusty Russell IBM Corporation. + +*/ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/module.h> +#include <linux/elf.h> +#include <linux/moduleloader.h> +#include <linux/err.h> +#include <linux/vmalloc.h> +#include <linux/ftrace.h> +#include <linux/bug.h> +#include <linux/uaccess.h> +#include <linux/kernel.h> +#include <asm/module.h> +#include <asm/firmware.h> +#include <asm/code-patching.h> +#include <linux/sort.h> +#include <asm/setup.h> +#include <asm/sections.h> +#include <asm/inst.h> + +/* FIXME: We don't do .init separately. To do this, we'd need to have + a separate r2 value in the init and core section, and stub between + them, too. + + Using a magic allocator which places modules within 32MB solves + this, and makes other things simpler. Anton? + --RR. */ + +#ifdef CONFIG_PPC64_ELF_ABI_V2 + +static func_desc_t func_desc(unsigned long addr) +{ + func_desc_t desc = { + .addr = addr, + }; + + return desc; +} + +/* PowerPC64 specific values for the Elf64_Sym st_other field. */ +#define STO_PPC64_LOCAL_BIT 5 +#define STO_PPC64_LOCAL_MASK (7 << STO_PPC64_LOCAL_BIT) +#define PPC64_LOCAL_ENTRY_OFFSET(other) \ + (((1 << (((other) & STO_PPC64_LOCAL_MASK) >> STO_PPC64_LOCAL_BIT)) >> 2) << 2) + +static unsigned int local_entry_offset(const Elf64_Sym *sym) +{ + /* sym->st_other indicates offset to local entry point + * (otherwise it will assume r12 is the address of the start + * of function and try to derive r2 from it). */ + return PPC64_LOCAL_ENTRY_OFFSET(sym->st_other); +} +#else + +static func_desc_t func_desc(unsigned long addr) +{ + return *(struct func_desc *)addr; +} +static unsigned int local_entry_offset(const Elf64_Sym *sym) +{ + return 0; +} + +void *dereference_module_function_descriptor(struct module *mod, void *ptr) +{ + if (ptr < (void *)mod->arch.start_opd || + ptr >= (void *)mod->arch.end_opd) + return ptr; + + return dereference_function_descriptor(ptr); +} +#endif + +static unsigned long func_addr(unsigned long addr) +{ + return func_desc(addr).addr; +} + +static unsigned long stub_func_addr(func_desc_t func) +{ + return func.addr; +} + +#define STUB_MAGIC 0x73747562 /* stub */ + +/* Like PPC32, we need little trampolines to do > 24-bit jumps (into + the kernel itself). But on PPC64, these need to be used for every + jump, actually, to reset r2 (TOC+0x8000). */ +struct ppc64_stub_entry +{ + /* 28 byte jump instruction sequence (7 instructions). We only + * need 6 instructions on ABIv2 but we always allocate 7 so + * so we don't have to modify the trampoline load instruction. */ + u32 jump[7]; + /* Used by ftrace to identify stubs */ + u32 magic; + /* Data for the above code */ + func_desc_t funcdata; +}; + +/* + * PPC64 uses 24 bit jumps, but we need to jump into other modules or + * the kernel which may be further. So we jump to a stub. + * + * For ELFv1 we need to use this to set up the new r2 value (aka TOC + * pointer). For ELFv2 it's the callee's responsibility to set up the + * new r2, but for both we need to save the old r2. + * + * We could simply patch the new r2 value and function pointer into + * the stub, but it's significantly shorter to put these values at the + * end of the stub code, and patch the stub address (32-bits relative + * to the TOC ptr, r2) into the stub. + */ +static u32 ppc64_stub_insns[] = { + PPC_RAW_ADDIS(_R11, _R2, 0), + PPC_RAW_ADDI(_R11, _R11, 0), + /* Save current r2 value in magic place on the stack. */ + PPC_RAW_STD(_R2, _R1, R2_STACK_OFFSET), + PPC_RAW_LD(_R12, _R11, 32), +#ifdef CONFIG_PPC64_ELF_ABI_V1 + /* Set up new r2 from function descriptor */ + PPC_RAW_LD(_R2, _R11, 40), +#endif + PPC_RAW_MTCTR(_R12), + PPC_RAW_BCTR(), +}; + +/* Count how many different 24-bit relocations (different symbol, + different addend) */ +static unsigned int count_relocs(const Elf64_Rela *rela, unsigned int num) +{ + unsigned int i, r_info, r_addend, _count_relocs; + + /* FIXME: Only count external ones --RR */ + _count_relocs = 0; + r_info = 0; + r_addend = 0; + for (i = 0; i < num; i++) + /* Only count 24-bit relocs, others don't need stubs */ + if (ELF64_R_TYPE(rela[i].r_info) == R_PPC_REL24 && + (r_info != ELF64_R_SYM(rela[i].r_info) || + r_addend != rela[i].r_addend)) { + _count_relocs++; + r_info = ELF64_R_SYM(rela[i].r_info); + r_addend = rela[i].r_addend; + } + + return _count_relocs; +} + +static int relacmp(const void *_x, const void *_y) +{ + const Elf64_Rela *x, *y; + + y = (Elf64_Rela *)_x; + x = (Elf64_Rela *)_y; + + /* Compare the entire r_info (as opposed to ELF64_R_SYM(r_info) only) to + * make the comparison cheaper/faster. It won't affect the sorting or + * the counting algorithms' performance + */ + if (x->r_info < y->r_info) + return -1; + else if (x->r_info > y->r_info) + return 1; + else if (x->r_addend < y->r_addend) + return -1; + else if (x->r_addend > y->r_addend) + return 1; + else + return 0; +} + +/* Get size of potential trampolines required. */ +static unsigned long get_stubs_size(const Elf64_Ehdr *hdr, + const Elf64_Shdr *sechdrs) +{ + /* One extra reloc so it's always 0-addr terminated */ + unsigned long relocs = 1; + unsigned i; + + /* Every relocated section... */ + for (i = 1; i < hdr->e_shnum; i++) { + if (sechdrs[i].sh_type == SHT_RELA) { + pr_debug("Found relocations in section %u\n", i); + pr_debug("Ptr: %p. Number: %Lu\n", + (void *)sechdrs[i].sh_addr, + sechdrs[i].sh_size / sizeof(Elf64_Rela)); + + /* Sort the relocation information based on a symbol and + * addend key. This is a stable O(n*log n) complexity + * algorithm but it will reduce the complexity of + * count_relocs() to linear complexity O(n) + */ + sort((void *)sechdrs[i].sh_addr, + sechdrs[i].sh_size / sizeof(Elf64_Rela), + sizeof(Elf64_Rela), relacmp, NULL); + + relocs += count_relocs((void *)sechdrs[i].sh_addr, + sechdrs[i].sh_size + / sizeof(Elf64_Rela)); + } + } + +#ifdef CONFIG_DYNAMIC_FTRACE + /* make the trampoline to the ftrace_caller */ + relocs++; +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS + /* an additional one for ftrace_regs_caller */ + relocs++; +#endif +#endif + + pr_debug("Looks like a total of %lu stubs, max\n", relocs); + return relocs * sizeof(struct ppc64_stub_entry); +} + +/* Still needed for ELFv2, for .TOC. */ +static void dedotify_versions(struct modversion_info *vers, + unsigned long size) +{ + struct modversion_info *end; + + for (end = (void *)vers + size; vers < end; vers++) + if (vers->name[0] == '.') { + memmove(vers->name, vers->name+1, strlen(vers->name)); + } +} + +/* + * Undefined symbols which refer to .funcname, hack to funcname. Make .TOC. + * seem to be defined (value set later). + */ +static void dedotify(Elf64_Sym *syms, unsigned int numsyms, char *strtab) +{ + unsigned int i; + + for (i = 1; i < numsyms; i++) { + if (syms[i].st_shndx == SHN_UNDEF) { + char *name = strtab + syms[i].st_name; + if (name[0] == '.') { + if (strcmp(name+1, "TOC.") == 0) + syms[i].st_shndx = SHN_ABS; + syms[i].st_name++; + } + } + } +} + +static Elf64_Sym *find_dot_toc(Elf64_Shdr *sechdrs, + const char *strtab, + unsigned int symindex) +{ + unsigned int i, numsyms; + Elf64_Sym *syms; + + syms = (Elf64_Sym *)sechdrs[symindex].sh_addr; + numsyms = sechdrs[symindex].sh_size / sizeof(Elf64_Sym); + + for (i = 1; i < numsyms; i++) { + if (syms[i].st_shndx == SHN_ABS + && strcmp(strtab + syms[i].st_name, "TOC.") == 0) + return &syms[i]; + } + return NULL; +} + +bool module_init_section(const char *name) +{ + /* We don't handle .init for the moment: always return false. */ + return false; +} + +int module_frob_arch_sections(Elf64_Ehdr *hdr, + Elf64_Shdr *sechdrs, + char *secstrings, + struct module *me) +{ + unsigned int i; + + /* Find .toc and .stubs sections, symtab and strtab */ + for (i = 1; i < hdr->e_shnum; i++) { + if (strcmp(secstrings + sechdrs[i].sh_name, ".stubs") == 0) + me->arch.stubs_section = i; + else if (strcmp(secstrings + sechdrs[i].sh_name, ".toc") == 0) { + me->arch.toc_section = i; + if (sechdrs[i].sh_addralign < 8) + sechdrs[i].sh_addralign = 8; + } + else if (strcmp(secstrings+sechdrs[i].sh_name,"__versions")==0) + dedotify_versions((void *)hdr + sechdrs[i].sh_offset, + sechdrs[i].sh_size); + + if (sechdrs[i].sh_type == SHT_SYMTAB) + dedotify((void *)hdr + sechdrs[i].sh_offset, + sechdrs[i].sh_size / sizeof(Elf64_Sym), + (void *)hdr + + sechdrs[sechdrs[i].sh_link].sh_offset); + } + + if (!me->arch.stubs_section) { + pr_err("%s: doesn't contain .stubs.\n", me->name); + return -ENOEXEC; + } + + /* If we don't have a .toc, just use .stubs. We need to set r2 + to some reasonable value in case the module calls out to + other functions via a stub, or if a function pointer escapes + the module by some means. */ + if (!me->arch.toc_section) + me->arch.toc_section = me->arch.stubs_section; + + /* Override the stubs size */ + sechdrs[me->arch.stubs_section].sh_size = get_stubs_size(hdr, sechdrs); + return 0; +} + +#ifdef CONFIG_MPROFILE_KERNEL + +static u32 stub_insns[] = { + PPC_RAW_LD(_R12, _R13, offsetof(struct paca_struct, kernel_toc)), + PPC_RAW_ADDIS(_R12, _R12, 0), + PPC_RAW_ADDI(_R12, _R12, 0), + PPC_RAW_MTCTR(_R12), + PPC_RAW_BCTR(), +}; + +/* + * For mprofile-kernel we use a special stub for ftrace_caller() because we + * can't rely on r2 containing this module's TOC when we enter the stub. + * + * That can happen if the function calling us didn't need to use the toc. In + * that case it won't have setup r2, and the r2 value will be either the + * kernel's toc, or possibly another modules toc. + * + * To deal with that this stub uses the kernel toc, which is always accessible + * via the paca (in r13). The target (ftrace_caller()) is responsible for + * saving and restoring the toc before returning. + */ +static inline int create_ftrace_stub(struct ppc64_stub_entry *entry, + unsigned long addr, + struct module *me) +{ + long reladdr; + + memcpy(entry->jump, stub_insns, sizeof(stub_insns)); + + /* Stub uses address relative to kernel toc (from the paca) */ + reladdr = addr - kernel_toc_addr(); + if (reladdr > 0x7FFFFFFF || reladdr < -(0x80000000L)) { + pr_err("%s: Address of %ps out of range of kernel_toc.\n", + me->name, (void *)addr); + return 0; + } + + entry->jump[1] |= PPC_HA(reladdr); + entry->jump[2] |= PPC_LO(reladdr); + + /* Even though we don't use funcdata in the stub, it's needed elsewhere. */ + entry->funcdata = func_desc(addr); + entry->magic = STUB_MAGIC; + + return 1; +} + +static bool is_mprofile_ftrace_call(const char *name) +{ + if (!strcmp("_mcount", name)) + return true; +#ifdef CONFIG_DYNAMIC_FTRACE + if (!strcmp("ftrace_caller", name)) + return true; +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS + if (!strcmp("ftrace_regs_caller", name)) + return true; +#endif +#endif + + return false; +} +#else +static inline int create_ftrace_stub(struct ppc64_stub_entry *entry, + unsigned long addr, + struct module *me) +{ + return 0; +} + +static bool is_mprofile_ftrace_call(const char *name) +{ + return false; +} +#endif + +/* + * r2 is the TOC pointer: it actually points 0x8000 into the TOC (this gives the + * value maximum span in an instruction which uses a signed offset). Round down + * to a 256 byte boundary for the odd case where we are setting up r2 without a + * .toc section. + */ +static inline unsigned long my_r2(const Elf64_Shdr *sechdrs, struct module *me) +{ + return (sechdrs[me->arch.toc_section].sh_addr & ~0xfful) + 0x8000; +} + +/* Patch stub to reference function and correct r2 value. */ +static inline int create_stub(const Elf64_Shdr *sechdrs, + struct ppc64_stub_entry *entry, + unsigned long addr, + struct module *me, + const char *name) +{ + long reladdr; + func_desc_t desc; + int i; + + if (is_mprofile_ftrace_call(name)) + return create_ftrace_stub(entry, addr, me); + + for (i = 0; i < ARRAY_SIZE(ppc64_stub_insns); i++) { + if (patch_instruction(&entry->jump[i], + ppc_inst(ppc64_stub_insns[i]))) + return 0; + } + + /* Stub uses address relative to r2. */ + reladdr = (unsigned long)entry - my_r2(sechdrs, me); + if (reladdr > 0x7FFFFFFF || reladdr < -(0x80000000L)) { + pr_err("%s: Address %p of stub out of range of %p.\n", + me->name, (void *)reladdr, (void *)my_r2); + return 0; + } + pr_debug("Stub %p get data from reladdr %li\n", entry, reladdr); + + if (patch_instruction(&entry->jump[0], + ppc_inst(entry->jump[0] | PPC_HA(reladdr)))) + return 0; + + if (patch_instruction(&entry->jump[1], + ppc_inst(entry->jump[1] | PPC_LO(reladdr)))) + return 0; + + // func_desc_t is 8 bytes if ABIv2, else 16 bytes + desc = func_desc(addr); + for (i = 0; i < sizeof(func_desc_t) / sizeof(u32); i++) { + if (patch_instruction(((u32 *)&entry->funcdata) + i, + ppc_inst(((u32 *)(&desc))[i]))) + return 0; + } + + if (patch_instruction(&entry->magic, ppc_inst(STUB_MAGIC))) + return 0; + + return 1; +} + +/* Create stub to jump to function described in this OPD/ptr: we need the + stub to set up the TOC ptr (r2) for the function. */ +static unsigned long stub_for_addr(const Elf64_Shdr *sechdrs, + unsigned long addr, + struct module *me, + const char *name) +{ + struct ppc64_stub_entry *stubs; + unsigned int i, num_stubs; + + num_stubs = sechdrs[me->arch.stubs_section].sh_size / sizeof(*stubs); + + /* Find this stub, or if that fails, the next avail. entry */ + stubs = (void *)sechdrs[me->arch.stubs_section].sh_addr; + for (i = 0; stub_func_addr(stubs[i].funcdata); i++) { + if (WARN_ON(i >= num_stubs)) + return 0; + + if (stub_func_addr(stubs[i].funcdata) == func_addr(addr)) + return (unsigned long)&stubs[i]; + } + + if (!create_stub(sechdrs, &stubs[i], addr, me, name)) + return 0; + + return (unsigned long)&stubs[i]; +} + +/* We expect a noop next: if it is, replace it with instruction to + restore r2. */ +static int restore_r2(const char *name, u32 *instruction, struct module *me) +{ + u32 *prev_insn = instruction - 1; + + if (is_mprofile_ftrace_call(name)) + return 1; + + /* + * Make sure the branch isn't a sibling call. Sibling calls aren't + * "link" branches and they don't return, so they don't need the r2 + * restore afterwards. + */ + if (!instr_is_relative_link_branch(ppc_inst(*prev_insn))) + return 1; + + if (*instruction != PPC_RAW_NOP()) { + pr_err("%s: Expected nop after call, got %08x at %pS\n", + me->name, *instruction, instruction); + return 0; + } + + /* ld r2,R2_STACK_OFFSET(r1) */ + if (patch_instruction(instruction, ppc_inst(PPC_INST_LD_TOC))) + return 0; + + return 1; +} + +int apply_relocate_add(Elf64_Shdr *sechdrs, + const char *strtab, + unsigned int symindex, + unsigned int relsec, + struct module *me) +{ + unsigned int i; + Elf64_Rela *rela = (void *)sechdrs[relsec].sh_addr; + Elf64_Sym *sym; + unsigned long *location; + unsigned long value; + + pr_debug("Applying ADD relocate section %u to %u\n", relsec, + sechdrs[relsec].sh_info); + + /* First time we're called, we can fix up .TOC. */ + if (!me->arch.toc_fixed) { + sym = find_dot_toc(sechdrs, strtab, symindex); + /* It's theoretically possible that a module doesn't want a + * .TOC. so don't fail it just for that. */ + if (sym) + sym->st_value = my_r2(sechdrs, me); + me->arch.toc_fixed = true; + } + + for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) { + /* This is where to make the change */ + location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + + rela[i].r_offset; + /* This is the symbol it is referring to */ + sym = (Elf64_Sym *)sechdrs[symindex].sh_addr + + ELF64_R_SYM(rela[i].r_info); + + pr_debug("RELOC at %p: %li-type as %s (0x%lx) + %li\n", + location, (long)ELF64_R_TYPE(rela[i].r_info), + strtab + sym->st_name, (unsigned long)sym->st_value, + (long)rela[i].r_addend); + + /* `Everything is relative'. */ + value = sym->st_value + rela[i].r_addend; + + switch (ELF64_R_TYPE(rela[i].r_info)) { + case R_PPC64_ADDR32: + /* Simply set it */ + *(u32 *)location = value; + break; + + case R_PPC64_ADDR64: + /* Simply set it */ + *(unsigned long *)location = value; + break; + + case R_PPC64_TOC: + *(unsigned long *)location = my_r2(sechdrs, me); + break; + + case R_PPC64_TOC16: + /* Subtract TOC pointer */ + value -= my_r2(sechdrs, me); + if (value + 0x8000 > 0xffff) { + pr_err("%s: bad TOC16 relocation (0x%lx)\n", + me->name, value); + return -ENOEXEC; + } + *((uint16_t *) location) + = (*((uint16_t *) location) & ~0xffff) + | (value & 0xffff); + break; + + case R_PPC64_TOC16_LO: + /* Subtract TOC pointer */ + value -= my_r2(sechdrs, me); + *((uint16_t *) location) + = (*((uint16_t *) location) & ~0xffff) + | (value & 0xffff); + break; + + case R_PPC64_TOC16_DS: + /* Subtract TOC pointer */ + value -= my_r2(sechdrs, me); + if ((value & 3) != 0 || value + 0x8000 > 0xffff) { + pr_err("%s: bad TOC16_DS relocation (0x%lx)\n", + me->name, value); + return -ENOEXEC; + } + *((uint16_t *) location) + = (*((uint16_t *) location) & ~0xfffc) + | (value & 0xfffc); + break; + + case R_PPC64_TOC16_LO_DS: + /* Subtract TOC pointer */ + value -= my_r2(sechdrs, me); + if ((value & 3) != 0) { + pr_err("%s: bad TOC16_LO_DS relocation (0x%lx)\n", + me->name, value); + return -ENOEXEC; + } + *((uint16_t *) location) + = (*((uint16_t *) location) & ~0xfffc) + | (value & 0xfffc); + break; + + case R_PPC64_TOC16_HA: + /* Subtract TOC pointer */ + value -= my_r2(sechdrs, me); + value = ((value + 0x8000) >> 16); + *((uint16_t *) location) + = (*((uint16_t *) location) & ~0xffff) + | (value & 0xffff); + break; + + case R_PPC_REL24: + /* FIXME: Handle weak symbols here --RR */ + if (sym->st_shndx == SHN_UNDEF || + sym->st_shndx == SHN_LIVEPATCH) { + /* External: go via stub */ + value = stub_for_addr(sechdrs, value, me, + strtab + sym->st_name); + if (!value) + return -ENOENT; + if (!restore_r2(strtab + sym->st_name, + (u32 *)location + 1, me)) + return -ENOEXEC; + } else + value += local_entry_offset(sym); + + /* Convert value to relative */ + value -= (unsigned long)location; + if (value + 0x2000000 > 0x3ffffff || (value & 3) != 0){ + pr_err("%s: REL24 %li out of range!\n", + me->name, (long int)value); + return -ENOEXEC; + } + + /* Only replace bits 2 through 26 */ + value = (*(uint32_t *)location & ~PPC_LI_MASK) | PPC_LI(value); + + if (patch_instruction((u32 *)location, ppc_inst(value))) + return -EFAULT; + + break; + + case R_PPC64_REL64: + /* 64 bits relative (used by features fixups) */ + *location = value - (unsigned long)location; + break; + + case R_PPC64_REL32: + /* 32 bits relative (used by relative exception tables) */ + /* Convert value to relative */ + value -= (unsigned long)location; + if (value + 0x80000000 > 0xffffffff) { + pr_err("%s: REL32 %li out of range!\n", + me->name, (long int)value); + return -ENOEXEC; + } + *(u32 *)location = value; + break; + + case R_PPC64_TOCSAVE: + /* + * Marker reloc indicates we don't have to save r2. + * That would only save us one instruction, so ignore + * it. + */ + break; + + case R_PPC64_ENTRY: + /* + * Optimize ELFv2 large code model entry point if + * the TOC is within 2GB range of current location. + */ + value = my_r2(sechdrs, me) - (unsigned long)location; + if (value + 0x80008000 > 0xffffffff) + break; + /* + * Check for the large code model prolog sequence: + * ld r2, ...(r12) + * add r2, r2, r12 + */ + if ((((uint32_t *)location)[0] & ~0xfffc) != PPC_RAW_LD(_R2, _R12, 0)) + break; + if (((uint32_t *)location)[1] != PPC_RAW_ADD(_R2, _R2, _R12)) + break; + /* + * If found, replace it with: + * addis r2, r12, (.TOC.-func)@ha + * addi r2, r2, (.TOC.-func)@l + */ + ((uint32_t *)location)[0] = PPC_RAW_ADDIS(_R2, _R12, PPC_HA(value)); + ((uint32_t *)location)[1] = PPC_RAW_ADDI(_R2, _R2, PPC_LO(value)); + break; + + case R_PPC64_REL16_HA: + /* Subtract location pointer */ + value -= (unsigned long)location; + value = ((value + 0x8000) >> 16); + *((uint16_t *) location) + = (*((uint16_t *) location) & ~0xffff) + | (value & 0xffff); + break; + + case R_PPC64_REL16_LO: + /* Subtract location pointer */ + value -= (unsigned long)location; + *((uint16_t *) location) + = (*((uint16_t *) location) & ~0xffff) + | (value & 0xffff); + break; + + default: + pr_err("%s: Unknown ADD relocation: %lu\n", + me->name, + (unsigned long)ELF64_R_TYPE(rela[i].r_info)); + return -ENOEXEC; + } + } + + return 0; +} + +#ifdef CONFIG_DYNAMIC_FTRACE +int module_trampoline_target(struct module *mod, unsigned long addr, + unsigned long *target) +{ + struct ppc64_stub_entry *stub; + func_desc_t funcdata; + u32 magic; + + if (!within_module_core(addr, mod)) { + pr_err("%s: stub %lx not in module %s\n", __func__, addr, mod->name); + return -EFAULT; + } + + stub = (struct ppc64_stub_entry *)addr; + + if (copy_from_kernel_nofault(&magic, &stub->magic, + sizeof(magic))) { + pr_err("%s: fault reading magic for stub %lx for %s\n", __func__, addr, mod->name); + return -EFAULT; + } + + if (magic != STUB_MAGIC) { + pr_err("%s: bad magic for stub %lx for %s\n", __func__, addr, mod->name); + return -EFAULT; + } + + if (copy_from_kernel_nofault(&funcdata, &stub->funcdata, + sizeof(funcdata))) { + pr_err("%s: fault reading funcdata for stub %lx for %s\n", __func__, addr, mod->name); + return -EFAULT; + } + + *target = stub_func_addr(funcdata); + + return 0; +} + +int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs) +{ + mod->arch.tramp = stub_for_addr(sechdrs, + (unsigned long)ftrace_caller, + mod, + "ftrace_caller"); +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS + mod->arch.tramp_regs = stub_for_addr(sechdrs, + (unsigned long)ftrace_regs_caller, + mod, + "ftrace_regs_caller"); + if (!mod->arch.tramp_regs) + return -ENOENT; +#endif + + if (!mod->arch.tramp) + return -ENOENT; + + return 0; +} +#endif diff --git a/arch/powerpc/kernel/msi.c b/arch/powerpc/kernel/msi.c new file mode 100644 index 000000000..a5d25bebc --- /dev/null +++ b/arch/powerpc/kernel/msi.c @@ -0,0 +1,39 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright 2006-2007, Michael Ellerman, IBM Corporation. + */ + +#include <linux/kernel.h> +#include <linux/msi.h> +#include <linux/pci.h> + +#include <asm/machdep.h> + +int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) +{ + struct pci_controller *phb = pci_bus_to_host(dev->bus); + + if (!phb->controller_ops.setup_msi_irqs || + !phb->controller_ops.teardown_msi_irqs) { + pr_debug("msi: Platform doesn't provide MSI callbacks.\n"); + return -ENOSYS; + } + + /* PowerPC doesn't support multiple MSI yet */ + if (type == PCI_CAP_ID_MSI && nvec > 1) + return 1; + + return phb->controller_ops.setup_msi_irqs(dev, nvec, type); +} + +void arch_teardown_msi_irqs(struct pci_dev *dev) +{ + struct pci_controller *phb = pci_bus_to_host(dev->bus); + + /* + * We can be called even when arch_setup_msi_irqs() returns -ENOSYS, + * so check the pointer again. + */ + if (phb->controller_ops.teardown_msi_irqs) + phb->controller_ops.teardown_msi_irqs(dev); +} diff --git a/arch/powerpc/kernel/note.S b/arch/powerpc/kernel/note.S new file mode 100644 index 000000000..bcdad1539 --- /dev/null +++ b/arch/powerpc/kernel/note.S @@ -0,0 +1,40 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * PowerPC ELF notes. + * + * Copyright 2019, IBM Corporation + */ + +#include <linux/elfnote.h> +#include <asm/elfnote.h> + +/* + * Ultravisor-capable bit (PowerNV only). + * + * Bit 0 indicates that the powerpc kernel binary knows how to run in an + * ultravisor-enabled system. + * + * In an ultravisor-enabled system, some machine resources are now controlled + * by the ultravisor. If the kernel is not ultravisor-capable, but it ends up + * being run on a machine with ultravisor, the kernel will probably crash + * trying to access ultravisor resources. For instance, it may crash in early + * boot trying to set the partition table entry 0. + * + * In an ultravisor-enabled system, a bootloader could warn the user or prevent + * the kernel from being run if the PowerPC ultravisor capability doesn't exist + * or the Ultravisor-capable bit is not set. + */ +#ifdef CONFIG_PPC_POWERNV +#define PPCCAP_ULTRAVISOR_BIT (1 << 0) +#else +#define PPCCAP_ULTRAVISOR_BIT 0 +#endif + +/* + * Add the PowerPC Capabilities in the binary ELF note. It is a bitmap that + * can be used to advertise kernel capabilities to userland. + */ +#define PPC_CAPABILITIES_BITMAP (PPCCAP_ULTRAVISOR_BIT) + +ELFNOTE(PowerPC, PPC_ELFNOTE_CAPABILITIES, + .long PPC_CAPABILITIES_BITMAP) diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c new file mode 100644 index 000000000..e385d3164 --- /dev/null +++ b/arch/powerpc/kernel/nvram_64.c @@ -0,0 +1,1055 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * c 2001 PPC 64 Team, IBM Corp + * + * /dev/nvram driver for PPC64 + */ + +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/fs.h> +#include <linux/miscdevice.h> +#include <linux/fcntl.h> +#include <linux/nvram.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/kmsg_dump.h> +#include <linux/pagemap.h> +#include <linux/pstore.h> +#include <linux/zlib.h> +#include <linux/uaccess.h> +#include <linux/of.h> +#include <asm/nvram.h> +#include <asm/rtas.h> +#include <asm/machdep.h> + +#undef DEBUG_NVRAM + +#define NVRAM_HEADER_LEN sizeof(struct nvram_header) +#define NVRAM_BLOCK_LEN NVRAM_HEADER_LEN + +/* If change this size, then change the size of NVNAME_LEN */ +struct nvram_header { + unsigned char signature; + unsigned char checksum; + unsigned short length; + /* Terminating null required only for names < 12 chars. */ + char name[12]; +}; + +struct nvram_partition { + struct list_head partition; + struct nvram_header header; + unsigned int index; +}; + +static LIST_HEAD(nvram_partitions); + +#ifdef CONFIG_PPC_PSERIES +struct nvram_os_partition rtas_log_partition = { + .name = "ibm,rtas-log", + .req_size = 2079, + .min_size = 1055, + .index = -1, + .os_partition = true +}; +#endif + +struct nvram_os_partition oops_log_partition = { + .name = "lnx,oops-log", + .req_size = 4000, + .min_size = 2000, + .index = -1, + .os_partition = true +}; + +static const char *nvram_os_partitions[] = { +#ifdef CONFIG_PPC_PSERIES + "ibm,rtas-log", +#endif + "lnx,oops-log", + NULL +}; + +static void oops_to_nvram(struct kmsg_dumper *dumper, + enum kmsg_dump_reason reason); + +static struct kmsg_dumper nvram_kmsg_dumper = { + .dump = oops_to_nvram +}; + +/* + * For capturing and compressing an oops or panic report... + + * big_oops_buf[] holds the uncompressed text we're capturing. + * + * oops_buf[] holds the compressed text, preceded by a oops header. + * oops header has u16 holding the version of oops header (to differentiate + * between old and new format header) followed by u16 holding the length of + * the compressed* text (*Or uncompressed, if compression fails.) and u64 + * holding the timestamp. oops_buf[] gets written to NVRAM. + * + * oops_log_info points to the header. oops_data points to the compressed text. + * + * +- oops_buf + * | +- oops_data + * v v + * +-----------+-----------+-----------+------------------------+ + * | version | length | timestamp | text | + * | (2 bytes) | (2 bytes) | (8 bytes) | (oops_data_sz bytes) | + * +-----------+-----------+-----------+------------------------+ + * ^ + * +- oops_log_info + * + * We preallocate these buffers during init to avoid kmalloc during oops/panic. + */ +static size_t big_oops_buf_sz; +static char *big_oops_buf, *oops_buf; +static char *oops_data; +static size_t oops_data_sz; + +/* Compression parameters */ +#define COMPR_LEVEL 6 +#define WINDOW_BITS 12 +#define MEM_LEVEL 4 +static struct z_stream_s stream; + +#ifdef CONFIG_PSTORE +#ifdef CONFIG_PPC_POWERNV +static struct nvram_os_partition skiboot_partition = { + .name = "ibm,skiboot", + .index = -1, + .os_partition = false +}; +#endif + +#ifdef CONFIG_PPC_PSERIES +static struct nvram_os_partition of_config_partition = { + .name = "of-config", + .index = -1, + .os_partition = false +}; +#endif + +static struct nvram_os_partition common_partition = { + .name = "common", + .index = -1, + .os_partition = false +}; + +static enum pstore_type_id nvram_type_ids[] = { + PSTORE_TYPE_DMESG, + PSTORE_TYPE_PPC_COMMON, + -1, + -1, + -1 +}; +static int read_type; +#endif + +/* nvram_write_os_partition + * + * We need to buffer the error logs into nvram to ensure that we have + * the failure information to decode. If we have a severe error there + * is no way to guarantee that the OS or the machine is in a state to + * get back to user land and write the error to disk. For example if + * the SCSI device driver causes a Machine Check by writing to a bad + * IO address, there is no way of guaranteeing that the device driver + * is in any state that is would also be able to write the error data + * captured to disk, thus we buffer it in NVRAM for analysis on the + * next boot. + * + * In NVRAM the partition containing the error log buffer will looks like: + * Header (in bytes): + * +-----------+----------+--------+------------+------------------+ + * | signature | checksum | length | name | data | + * |0 |1 |2 3|4 15|16 length-1| + * +-----------+----------+--------+------------+------------------+ + * + * The 'data' section would look like (in bytes): + * +--------------+------------+-----------------------------------+ + * | event_logged | sequence # | error log | + * |0 3|4 7|8 error_log_size-1| + * +--------------+------------+-----------------------------------+ + * + * event_logged: 0 if event has not been logged to syslog, 1 if it has + * sequence #: The unique sequence # for each event. (until it wraps) + * error log: The error log from event_scan + */ +int nvram_write_os_partition(struct nvram_os_partition *part, + char *buff, int length, + unsigned int err_type, + unsigned int error_log_cnt) +{ + int rc; + loff_t tmp_index; + struct err_log_info info; + + if (part->index == -1) + return -ESPIPE; + + if (length > part->size) + length = part->size; + + info.error_type = cpu_to_be32(err_type); + info.seq_num = cpu_to_be32(error_log_cnt); + + tmp_index = part->index; + + rc = ppc_md.nvram_write((char *)&info, sizeof(info), &tmp_index); + if (rc <= 0) { + pr_err("%s: Failed nvram_write (%d)\n", __func__, rc); + return rc; + } + + rc = ppc_md.nvram_write(buff, length, &tmp_index); + if (rc <= 0) { + pr_err("%s: Failed nvram_write (%d)\n", __func__, rc); + return rc; + } + + return 0; +} + +/* nvram_read_partition + * + * Reads nvram partition for at most 'length' + */ +int nvram_read_partition(struct nvram_os_partition *part, char *buff, + int length, unsigned int *err_type, + unsigned int *error_log_cnt) +{ + int rc; + loff_t tmp_index; + struct err_log_info info; + + if (part->index == -1) + return -1; + + if (length > part->size) + length = part->size; + + tmp_index = part->index; + + if (part->os_partition) { + rc = ppc_md.nvram_read((char *)&info, sizeof(info), &tmp_index); + if (rc <= 0) { + pr_err("%s: Failed nvram_read (%d)\n", __func__, rc); + return rc; + } + } + + rc = ppc_md.nvram_read(buff, length, &tmp_index); + if (rc <= 0) { + pr_err("%s: Failed nvram_read (%d)\n", __func__, rc); + return rc; + } + + if (part->os_partition) { + *error_log_cnt = be32_to_cpu(info.seq_num); + *err_type = be32_to_cpu(info.error_type); + } + + return 0; +} + +/* nvram_init_os_partition + * + * This sets up a partition with an "OS" signature. + * + * The general strategy is the following: + * 1.) If a partition with the indicated name already exists... + * - If it's large enough, use it. + * - Otherwise, recycle it and keep going. + * 2.) Search for a free partition that is large enough. + * 3.) If there's not a free partition large enough, recycle any obsolete + * OS partitions and try again. + * 4.) Will first try getting a chunk that will satisfy the requested size. + * 5.) If a chunk of the requested size cannot be allocated, then try finding + * a chunk that will satisfy the minum needed. + * + * Returns 0 on success, else -1. + */ +int __init nvram_init_os_partition(struct nvram_os_partition *part) +{ + loff_t p; + int size; + + /* Look for ours */ + p = nvram_find_partition(part->name, NVRAM_SIG_OS, &size); + + /* Found one but too small, remove it */ + if (p && size < part->min_size) { + pr_info("nvram: Found too small %s partition," + " removing it...\n", part->name); + nvram_remove_partition(part->name, NVRAM_SIG_OS, NULL); + p = 0; + } + + /* Create one if we didn't find */ + if (!p) { + p = nvram_create_partition(part->name, NVRAM_SIG_OS, + part->req_size, part->min_size); + if (p == -ENOSPC) { + pr_info("nvram: No room to create %s partition, " + "deleting any obsolete OS partitions...\n", + part->name); + nvram_remove_partition(NULL, NVRAM_SIG_OS, + nvram_os_partitions); + p = nvram_create_partition(part->name, NVRAM_SIG_OS, + part->req_size, part->min_size); + } + } + + if (p <= 0) { + pr_err("nvram: Failed to find or create %s" + " partition, err %d\n", part->name, (int)p); + return -1; + } + + part->index = p; + part->size = nvram_get_partition_size(p) - sizeof(struct err_log_info); + + return 0; +} + +/* Derived from logfs_compress() */ +static int nvram_compress(const void *in, void *out, size_t inlen, + size_t outlen) +{ + int err, ret; + + ret = -EIO; + err = zlib_deflateInit2(&stream, COMPR_LEVEL, Z_DEFLATED, WINDOW_BITS, + MEM_LEVEL, Z_DEFAULT_STRATEGY); + if (err != Z_OK) + goto error; + + stream.next_in = in; + stream.avail_in = inlen; + stream.total_in = 0; + stream.next_out = out; + stream.avail_out = outlen; + stream.total_out = 0; + + err = zlib_deflate(&stream, Z_FINISH); + if (err != Z_STREAM_END) + goto error; + + err = zlib_deflateEnd(&stream); + if (err != Z_OK) + goto error; + + if (stream.total_out >= stream.total_in) + goto error; + + ret = stream.total_out; +error: + return ret; +} + +/* Compress the text from big_oops_buf into oops_buf. */ +static int zip_oops(size_t text_len) +{ + struct oops_log_info *oops_hdr = (struct oops_log_info *)oops_buf; + int zipped_len = nvram_compress(big_oops_buf, oops_data, text_len, + oops_data_sz); + if (zipped_len < 0) { + pr_err("nvram: compression failed; returned %d\n", zipped_len); + pr_err("nvram: logging uncompressed oops/panic report\n"); + return -1; + } + oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION); + oops_hdr->report_length = cpu_to_be16(zipped_len); + oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds()); + return 0; +} + +#ifdef CONFIG_PSTORE +static int nvram_pstore_open(struct pstore_info *psi) +{ + /* Reset the iterator to start reading partitions again */ + read_type = -1; + return 0; +} + +/** + * nvram_pstore_write - pstore write callback for nvram + * @record: pstore record to write, with @id to be set + * + * Called by pstore_dump() when an oops or panic report is logged in the + * printk buffer. + * Returns 0 on successful write. + */ +static int nvram_pstore_write(struct pstore_record *record) +{ + int rc; + unsigned int err_type = ERR_TYPE_KERNEL_PANIC; + struct oops_log_info *oops_hdr = (struct oops_log_info *) oops_buf; + + /* part 1 has the recent messages from printk buffer */ + if (record->part > 1 || (record->type != PSTORE_TYPE_DMESG)) + return -1; + + if (clobbering_unread_rtas_event()) + return -1; + + oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION); + oops_hdr->report_length = cpu_to_be16(record->size); + oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds()); + + if (record->compressed) + err_type = ERR_TYPE_KERNEL_PANIC_GZ; + + rc = nvram_write_os_partition(&oops_log_partition, oops_buf, + (int) (sizeof(*oops_hdr) + record->size), err_type, + record->count); + + if (rc != 0) + return rc; + + record->id = record->part; + return 0; +} + +/* + * Reads the oops/panic report, rtas, of-config and common partition. + * Returns the length of the data we read from each partition. + * Returns 0 if we've been called before. + */ +static ssize_t nvram_pstore_read(struct pstore_record *record) +{ + struct oops_log_info *oops_hdr; + unsigned int err_type, id_no, size = 0; + struct nvram_os_partition *part = NULL; + char *buff = NULL; + int sig = 0; + loff_t p; + + read_type++; + + switch (nvram_type_ids[read_type]) { + case PSTORE_TYPE_DMESG: + part = &oops_log_partition; + record->type = PSTORE_TYPE_DMESG; + break; + case PSTORE_TYPE_PPC_COMMON: + sig = NVRAM_SIG_SYS; + part = &common_partition; + record->type = PSTORE_TYPE_PPC_COMMON; + record->id = PSTORE_TYPE_PPC_COMMON; + record->time.tv_sec = 0; + record->time.tv_nsec = 0; + break; +#ifdef CONFIG_PPC_PSERIES + case PSTORE_TYPE_PPC_RTAS: + part = &rtas_log_partition; + record->type = PSTORE_TYPE_PPC_RTAS; + record->time.tv_sec = last_rtas_event; + record->time.tv_nsec = 0; + break; + case PSTORE_TYPE_PPC_OF: + sig = NVRAM_SIG_OF; + part = &of_config_partition; + record->type = PSTORE_TYPE_PPC_OF; + record->id = PSTORE_TYPE_PPC_OF; + record->time.tv_sec = 0; + record->time.tv_nsec = 0; + break; +#endif +#ifdef CONFIG_PPC_POWERNV + case PSTORE_TYPE_PPC_OPAL: + sig = NVRAM_SIG_FW; + part = &skiboot_partition; + record->type = PSTORE_TYPE_PPC_OPAL; + record->id = PSTORE_TYPE_PPC_OPAL; + record->time.tv_sec = 0; + record->time.tv_nsec = 0; + break; +#endif + default: + return 0; + } + + if (!part->os_partition) { + p = nvram_find_partition(part->name, sig, &size); + if (p <= 0) { + pr_err("nvram: Failed to find partition %s, " + "err %d\n", part->name, (int)p); + return 0; + } + part->index = p; + part->size = size; + } + + buff = kmalloc(part->size, GFP_KERNEL); + + if (!buff) + return -ENOMEM; + + if (nvram_read_partition(part, buff, part->size, &err_type, &id_no)) { + kfree(buff); + return 0; + } + + record->count = 0; + + if (part->os_partition) + record->id = id_no; + + if (nvram_type_ids[read_type] == PSTORE_TYPE_DMESG) { + size_t length, hdr_size; + + oops_hdr = (struct oops_log_info *)buff; + if (be16_to_cpu(oops_hdr->version) < OOPS_HDR_VERSION) { + /* Old format oops header had 2-byte record size */ + hdr_size = sizeof(u16); + length = be16_to_cpu(oops_hdr->version); + record->time.tv_sec = 0; + record->time.tv_nsec = 0; + } else { + hdr_size = sizeof(*oops_hdr); + length = be16_to_cpu(oops_hdr->report_length); + record->time.tv_sec = be64_to_cpu(oops_hdr->timestamp); + record->time.tv_nsec = 0; + } + record->buf = kmemdup(buff + hdr_size, length, GFP_KERNEL); + kfree(buff); + if (record->buf == NULL) + return -ENOMEM; + + record->ecc_notice_size = 0; + if (err_type == ERR_TYPE_KERNEL_PANIC_GZ) + record->compressed = true; + else + record->compressed = false; + return length; + } + + record->buf = buff; + return part->size; +} + +static struct pstore_info nvram_pstore_info = { + .owner = THIS_MODULE, + .name = "nvram", + .flags = PSTORE_FLAGS_DMESG, + .open = nvram_pstore_open, + .read = nvram_pstore_read, + .write = nvram_pstore_write, +}; + +static int __init nvram_pstore_init(void) +{ + int rc = 0; + + if (machine_is(pseries)) { + nvram_type_ids[2] = PSTORE_TYPE_PPC_RTAS; + nvram_type_ids[3] = PSTORE_TYPE_PPC_OF; + } else + nvram_type_ids[2] = PSTORE_TYPE_PPC_OPAL; + + nvram_pstore_info.buf = oops_data; + nvram_pstore_info.bufsize = oops_data_sz; + + rc = pstore_register(&nvram_pstore_info); + if (rc && (rc != -EPERM)) + /* Print error only when pstore.backend == nvram */ + pr_err("nvram: pstore_register() failed, returned %d. " + "Defaults to kmsg_dump\n", rc); + + return rc; +} +#else +static int __init nvram_pstore_init(void) +{ + return -1; +} +#endif + +void __init nvram_init_oops_partition(int rtas_partition_exists) +{ + int rc; + + rc = nvram_init_os_partition(&oops_log_partition); + if (rc != 0) { +#ifdef CONFIG_PPC_PSERIES + if (!rtas_partition_exists) { + pr_err("nvram: Failed to initialize oops partition!"); + return; + } + pr_notice("nvram: Using %s partition to log both" + " RTAS errors and oops/panic reports\n", + rtas_log_partition.name); + memcpy(&oops_log_partition, &rtas_log_partition, + sizeof(rtas_log_partition)); +#else + pr_err("nvram: Failed to initialize oops partition!"); + return; +#endif + } + oops_buf = kmalloc(oops_log_partition.size, GFP_KERNEL); + if (!oops_buf) { + pr_err("nvram: No memory for %s partition\n", + oops_log_partition.name); + return; + } + oops_data = oops_buf + sizeof(struct oops_log_info); + oops_data_sz = oops_log_partition.size - sizeof(struct oops_log_info); + + rc = nvram_pstore_init(); + + if (!rc) + return; + + /* + * Figure compression (preceded by elimination of each line's <n> + * severity prefix) will reduce the oops/panic report to at most + * 45% of its original size. + */ + big_oops_buf_sz = (oops_data_sz * 100) / 45; + big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL); + if (big_oops_buf) { + stream.workspace = kmalloc(zlib_deflate_workspacesize( + WINDOW_BITS, MEM_LEVEL), GFP_KERNEL); + if (!stream.workspace) { + pr_err("nvram: No memory for compression workspace; " + "skipping compression of %s partition data\n", + oops_log_partition.name); + kfree(big_oops_buf); + big_oops_buf = NULL; + } + } else { + pr_err("No memory for uncompressed %s data; " + "skipping compression\n", oops_log_partition.name); + stream.workspace = NULL; + } + + rc = kmsg_dump_register(&nvram_kmsg_dumper); + if (rc != 0) { + pr_err("nvram: kmsg_dump_register() failed; returned %d\n", rc); + kfree(oops_buf); + kfree(big_oops_buf); + kfree(stream.workspace); + } +} + +/* + * This is our kmsg_dump callback, called after an oops or panic report + * has been written to the printk buffer. We want to capture as much + * of the printk buffer as possible. First, capture as much as we can + * that we think will compress sufficiently to fit in the lnx,oops-log + * partition. If that's too much, go back and capture uncompressed text. + */ +static void oops_to_nvram(struct kmsg_dumper *dumper, + enum kmsg_dump_reason reason) +{ + struct oops_log_info *oops_hdr = (struct oops_log_info *)oops_buf; + static unsigned int oops_count = 0; + static struct kmsg_dump_iter iter; + static bool panicking = false; + static DEFINE_SPINLOCK(lock); + unsigned long flags; + size_t text_len; + unsigned int err_type = ERR_TYPE_KERNEL_PANIC_GZ; + int rc = -1; + + switch (reason) { + case KMSG_DUMP_SHUTDOWN: + /* These are almost always orderly shutdowns. */ + return; + case KMSG_DUMP_OOPS: + break; + case KMSG_DUMP_PANIC: + panicking = true; + break; + case KMSG_DUMP_EMERG: + if (panicking) + /* Panic report already captured. */ + return; + break; + default: + pr_err("%s: ignoring unrecognized KMSG_DUMP_* reason %d\n", + __func__, (int) reason); + return; + } + + if (clobbering_unread_rtas_event()) + return; + + if (!spin_trylock_irqsave(&lock, flags)) + return; + + if (big_oops_buf) { + kmsg_dump_rewind(&iter); + kmsg_dump_get_buffer(&iter, false, + big_oops_buf, big_oops_buf_sz, &text_len); + rc = zip_oops(text_len); + } + if (rc != 0) { + kmsg_dump_rewind(&iter); + kmsg_dump_get_buffer(&iter, false, + oops_data, oops_data_sz, &text_len); + err_type = ERR_TYPE_KERNEL_PANIC; + oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION); + oops_hdr->report_length = cpu_to_be16(text_len); + oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds()); + } + + (void) nvram_write_os_partition(&oops_log_partition, oops_buf, + (int) (sizeof(*oops_hdr) + text_len), err_type, + ++oops_count); + + spin_unlock_irqrestore(&lock, flags); +} + +#ifdef DEBUG_NVRAM +static void __init nvram_print_partitions(char * label) +{ + struct nvram_partition * tmp_part; + + printk(KERN_WARNING "--------%s---------\n", label); + printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n"); + list_for_each_entry(tmp_part, &nvram_partitions, partition) { + printk(KERN_WARNING "%4d \t%02x\t%02x\t%d\t%12.12s\n", + tmp_part->index, tmp_part->header.signature, + tmp_part->header.checksum, tmp_part->header.length, + tmp_part->header.name); + } +} +#endif + + +static int __init nvram_write_header(struct nvram_partition * part) +{ + loff_t tmp_index; + int rc; + struct nvram_header phead; + + memcpy(&phead, &part->header, NVRAM_HEADER_LEN); + phead.length = cpu_to_be16(phead.length); + + tmp_index = part->index; + rc = ppc_md.nvram_write((char *)&phead, NVRAM_HEADER_LEN, &tmp_index); + + return rc; +} + + +static unsigned char __init nvram_checksum(struct nvram_header *p) +{ + unsigned int c_sum, c_sum2; + unsigned short *sp = (unsigned short *)p->name; /* assume 6 shorts */ + c_sum = p->signature + p->length + sp[0] + sp[1] + sp[2] + sp[3] + sp[4] + sp[5]; + + /* The sum may have spilled into the 3rd byte. Fold it back. */ + c_sum = ((c_sum & 0xffff) + (c_sum >> 16)) & 0xffff; + /* The sum cannot exceed 2 bytes. Fold it into a checksum */ + c_sum2 = (c_sum >> 8) + (c_sum << 8); + c_sum = ((c_sum + c_sum2) >> 8) & 0xff; + return c_sum; +} + +/* + * Per the criteria passed via nvram_remove_partition(), should this + * partition be removed? 1=remove, 0=keep + */ +static int __init nvram_can_remove_partition(struct nvram_partition *part, + const char *name, int sig, const char *exceptions[]) +{ + if (part->header.signature != sig) + return 0; + if (name) { + if (strncmp(name, part->header.name, 12)) + return 0; + } else if (exceptions) { + const char **except; + for (except = exceptions; *except; except++) { + if (!strncmp(*except, part->header.name, 12)) + return 0; + } + } + return 1; +} + +/** + * nvram_remove_partition - Remove one or more partitions in nvram + * @name: name of the partition to remove, or NULL for a + * signature only match + * @sig: signature of the partition(s) to remove + * @exceptions: When removing all partitions with a matching signature, + * leave these alone. + */ + +int __init nvram_remove_partition(const char *name, int sig, + const char *exceptions[]) +{ + struct nvram_partition *part, *prev, *tmp; + int rc; + + list_for_each_entry(part, &nvram_partitions, partition) { + if (!nvram_can_remove_partition(part, name, sig, exceptions)) + continue; + + /* Make partition a free partition */ + part->header.signature = NVRAM_SIG_FREE; + memset(part->header.name, 'w', 12); + part->header.checksum = nvram_checksum(&part->header); + rc = nvram_write_header(part); + if (rc <= 0) { + printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc); + return rc; + } + } + + /* Merge contiguous ones */ + prev = NULL; + list_for_each_entry_safe(part, tmp, &nvram_partitions, partition) { + if (part->header.signature != NVRAM_SIG_FREE) { + prev = NULL; + continue; + } + if (prev) { + prev->header.length += part->header.length; + prev->header.checksum = nvram_checksum(&prev->header); + rc = nvram_write_header(prev); + if (rc <= 0) { + printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc); + return rc; + } + list_del(&part->partition); + kfree(part); + } else + prev = part; + } + + return 0; +} + +/** + * nvram_create_partition - Create a partition in nvram + * @name: name of the partition to create + * @sig: signature of the partition to create + * @req_size: size of data to allocate in bytes + * @min_size: minimum acceptable size (0 means req_size) + * + * Returns a negative error code or a positive nvram index + * of the beginning of the data area of the newly created + * partition. If you provided a min_size smaller than req_size + * you need to query for the actual size yourself after the + * call using nvram_partition_get_size(). + */ +loff_t __init nvram_create_partition(const char *name, int sig, + int req_size, int min_size) +{ + struct nvram_partition *part; + struct nvram_partition *new_part; + struct nvram_partition *free_part = NULL; + static char nv_init_vals[16]; + loff_t tmp_index; + long size = 0; + int rc; + + BUILD_BUG_ON(NVRAM_BLOCK_LEN != 16); + + /* Convert sizes from bytes to blocks */ + req_size = ALIGN(req_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN; + min_size = ALIGN(min_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN; + + /* If no minimum size specified, make it the same as the + * requested size + */ + if (min_size == 0) + min_size = req_size; + if (min_size > req_size) + return -EINVAL; + + /* Now add one block to each for the header */ + req_size += 1; + min_size += 1; + + /* Find a free partition that will give us the maximum needed size + If can't find one that will give us the minimum size needed */ + list_for_each_entry(part, &nvram_partitions, partition) { + if (part->header.signature != NVRAM_SIG_FREE) + continue; + + if (part->header.length >= req_size) { + size = req_size; + free_part = part; + break; + } + if (part->header.length > size && + part->header.length >= min_size) { + size = part->header.length; + free_part = part; + } + } + if (!size) + return -ENOSPC; + + /* Create our OS partition */ + new_part = kzalloc(sizeof(*new_part), GFP_KERNEL); + if (!new_part) { + pr_err("%s: kmalloc failed\n", __func__); + return -ENOMEM; + } + + new_part->index = free_part->index; + new_part->header.signature = sig; + new_part->header.length = size; + memcpy(new_part->header.name, name, strnlen(name, sizeof(new_part->header.name))); + new_part->header.checksum = nvram_checksum(&new_part->header); + + rc = nvram_write_header(new_part); + if (rc <= 0) { + pr_err("%s: nvram_write_header failed (%d)\n", __func__, rc); + kfree(new_part); + return rc; + } + list_add_tail(&new_part->partition, &free_part->partition); + + /* Adjust or remove the partition we stole the space from */ + if (free_part->header.length > size) { + free_part->index += size * NVRAM_BLOCK_LEN; + free_part->header.length -= size; + free_part->header.checksum = nvram_checksum(&free_part->header); + rc = nvram_write_header(free_part); + if (rc <= 0) { + pr_err("%s: nvram_write_header failed (%d)\n", + __func__, rc); + return rc; + } + } else { + list_del(&free_part->partition); + kfree(free_part); + } + + /* Clear the new partition */ + for (tmp_index = new_part->index + NVRAM_HEADER_LEN; + tmp_index < ((size - 1) * NVRAM_BLOCK_LEN); + tmp_index += NVRAM_BLOCK_LEN) { + rc = ppc_md.nvram_write(nv_init_vals, NVRAM_BLOCK_LEN, &tmp_index); + if (rc <= 0) { + pr_err("%s: nvram_write failed (%d)\n", + __func__, rc); + return rc; + } + } + + return new_part->index + NVRAM_HEADER_LEN; +} + +/** + * nvram_get_partition_size - Get the data size of an nvram partition + * @data_index: This is the offset of the start of the data of + * the partition. The same value that is returned by + * nvram_create_partition(). + */ +int nvram_get_partition_size(loff_t data_index) +{ + struct nvram_partition *part; + + list_for_each_entry(part, &nvram_partitions, partition) { + if (part->index + NVRAM_HEADER_LEN == data_index) + return (part->header.length - 1) * NVRAM_BLOCK_LEN; + } + return -1; +} + + +/** + * nvram_find_partition - Find an nvram partition by signature and name + * @name: Name of the partition or NULL for any name + * @sig: Signature to test against + * @out_size: if non-NULL, returns the size of the data part of the partition + */ +loff_t nvram_find_partition(const char *name, int sig, int *out_size) +{ + struct nvram_partition *p; + + list_for_each_entry(p, &nvram_partitions, partition) { + if (p->header.signature == sig && + (!name || !strncmp(p->header.name, name, 12))) { + if (out_size) + *out_size = (p->header.length - 1) * + NVRAM_BLOCK_LEN; + return p->index + NVRAM_HEADER_LEN; + } + } + return 0; +} + +int __init nvram_scan_partitions(void) +{ + loff_t cur_index = 0; + struct nvram_header phead; + struct nvram_partition * tmp_part; + unsigned char c_sum; + char * header; + int total_size; + int err; + + if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0) + return -ENODEV; + total_size = ppc_md.nvram_size(); + + header = kmalloc(NVRAM_HEADER_LEN, GFP_KERNEL); + if (!header) { + printk(KERN_ERR "nvram_scan_partitions: Failed kmalloc\n"); + return -ENOMEM; + } + + while (cur_index < total_size) { + + err = ppc_md.nvram_read(header, NVRAM_HEADER_LEN, &cur_index); + if (err != NVRAM_HEADER_LEN) { + printk(KERN_ERR "nvram_scan_partitions: Error parsing " + "nvram partitions\n"); + goto out; + } + + cur_index -= NVRAM_HEADER_LEN; /* nvram_read will advance us */ + + memcpy(&phead, header, NVRAM_HEADER_LEN); + + phead.length = be16_to_cpu(phead.length); + + err = 0; + c_sum = nvram_checksum(&phead); + if (c_sum != phead.checksum) { + printk(KERN_WARNING "WARNING: nvram partition checksum" + " was %02x, should be %02x!\n", + phead.checksum, c_sum); + printk(KERN_WARNING "Terminating nvram partition scan\n"); + goto out; + } + if (!phead.length) { + printk(KERN_WARNING "WARNING: nvram corruption " + "detected: 0-length partition\n"); + goto out; + } + tmp_part = kmalloc(sizeof(*tmp_part), GFP_KERNEL); + err = -ENOMEM; + if (!tmp_part) { + printk(KERN_ERR "nvram_scan_partitions: kmalloc failed\n"); + goto out; + } + + memcpy(&tmp_part->header, &phead, NVRAM_HEADER_LEN); + tmp_part->index = cur_index; + list_add_tail(&tmp_part->partition, &nvram_partitions); + + cur_index += phead.length * NVRAM_BLOCK_LEN; + } + err = 0; + +#ifdef DEBUG_NVRAM + nvram_print_partitions("NVRAM Partitions"); +#endif + + out: + kfree(header); + return err; +} diff --git a/arch/powerpc/kernel/of_platform.c b/arch/powerpc/kernel/of_platform.c new file mode 100644 index 000000000..f89376ff6 --- /dev/null +++ b/arch/powerpc/kernel/of_platform.c @@ -0,0 +1,104 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. + * <benh@kernel.crashing.org> + * and Arnd Bergmann, IBM Corp. + */ + +#undef DEBUG + +#include <linux/string.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/export.h> +#include <linux/mod_devicetable.h> +#include <linux/pci.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_platform.h> +#include <linux/atomic.h> + +#include <asm/errno.h> +#include <asm/topology.h> +#include <asm/pci-bridge.h> +#include <asm/ppc-pci.h> +#include <asm/eeh.h> + +#ifdef CONFIG_PPC_OF_PLATFORM_PCI + +/* The probing of PCI controllers from of_platform is currently + * 64 bits only, mostly due to gratuitous differences between + * the 32 and 64 bits PCI code on PowerPC and the 32 bits one + * lacking some bits needed here. + */ + +static int of_pci_phb_probe(struct platform_device *dev) +{ + struct pci_controller *phb; + + /* Check if we can do that ... */ + if (ppc_md.pci_setup_phb == NULL) + return -ENODEV; + + pr_info("Setting up PCI bus %pOF\n", dev->dev.of_node); + + /* Alloc and setup PHB data structure */ + phb = pcibios_alloc_controller(dev->dev.of_node); + if (!phb) + return -ENODEV; + + /* Setup parent in sysfs */ + phb->parent = &dev->dev; + + /* Setup the PHB using arch provided callback */ + if (ppc_md.pci_setup_phb(phb)) { + pcibios_free_controller(phb); + return -ENODEV; + } + + /* Process "ranges" property */ + pci_process_bridge_OF_ranges(phb, dev->dev.of_node, 0); + + /* Init pci_dn data structures */ + pci_devs_phb_init_dynamic(phb); + + /* Create EEH PE for the PHB */ + eeh_phb_pe_create(phb); + + /* Scan the bus */ + pcibios_scan_phb(phb); + if (phb->bus == NULL) + return -ENXIO; + + /* Claim resources. This might need some rework as well depending + * whether we are doing probe-only or not, like assigning unassigned + * resources etc... + */ + pcibios_claim_one_bus(phb->bus); + + /* Add probed PCI devices to the device model */ + pci_bus_add_devices(phb->bus); + + return 0; +} + +static const struct of_device_id of_pci_phb_ids[] = { + { .type = "pci", }, + { .type = "pcix", }, + { .type = "pcie", }, + { .type = "pciex", }, + { .type = "ht", }, + {} +}; + +static struct platform_driver of_pci_phb_driver = { + .probe = of_pci_phb_probe, + .driver = { + .name = "of-pci", + .of_match_table = of_pci_phb_ids, + }, +}; + +builtin_platform_driver(of_pci_phb_driver); + +#endif /* CONFIG_PPC_OF_PLATFORM_PCI */ diff --git a/arch/powerpc/kernel/optprobes.c b/arch/powerpc/kernel/optprobes.c new file mode 100644 index 000000000..3b1c2236c --- /dev/null +++ b/arch/powerpc/kernel/optprobes.c @@ -0,0 +1,304 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Code for Kernel probes Jump optimization. + * + * Copyright 2017, Anju T, IBM Corp. + */ + +#include <linux/kprobes.h> +#include <linux/jump_label.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/list.h> +#include <asm/kprobes.h> +#include <asm/ptrace.h> +#include <asm/cacheflush.h> +#include <asm/code-patching.h> +#include <asm/sstep.h> +#include <asm/ppc-opcode.h> +#include <asm/inst.h> + +#define TMPL_CALL_HDLR_IDX (optprobe_template_call_handler - optprobe_template_entry) +#define TMPL_EMULATE_IDX (optprobe_template_call_emulate - optprobe_template_entry) +#define TMPL_RET_IDX (optprobe_template_ret - optprobe_template_entry) +#define TMPL_OP_IDX (optprobe_template_op_address - optprobe_template_entry) +#define TMPL_INSN_IDX (optprobe_template_insn - optprobe_template_entry) +#define TMPL_END_IDX (optprobe_template_end - optprobe_template_entry) + +static bool insn_page_in_use; + +void *alloc_optinsn_page(void) +{ + if (insn_page_in_use) + return NULL; + insn_page_in_use = true; + return &optinsn_slot; +} + +void free_optinsn_page(void *page) +{ + insn_page_in_use = false; +} + +/* + * Check if we can optimize this probe. Returns NIP post-emulation if this can + * be optimized and 0 otherwise. + */ +static unsigned long can_optimize(struct kprobe *p) +{ + struct pt_regs regs; + struct instruction_op op; + unsigned long nip = 0; + unsigned long addr = (unsigned long)p->addr; + + /* + * kprobe placed for kretprobe during boot time + * has a 'nop' instruction, which can be emulated. + * So further checks can be skipped. + */ + if (p->addr == (kprobe_opcode_t *)&__kretprobe_trampoline) + return addr + sizeof(kprobe_opcode_t); + + /* + * We only support optimizing kernel addresses, but not + * module addresses. + * + * FIXME: Optimize kprobes placed in module addresses. + */ + if (!is_kernel_addr(addr)) + return 0; + + memset(®s, 0, sizeof(struct pt_regs)); + regs.nip = addr; + regs.trap = 0x0; + regs.msr = MSR_KERNEL; + + /* + * Kprobe placed in conditional branch instructions are + * not optimized, as we can't predict the nip prior with + * dummy pt_regs and can not ensure that the return branch + * from detour buffer falls in the range of address (i.e 32MB). + * A branch back from trampoline is set up in the detour buffer + * to the nip returned by the analyse_instr() here. + * + * Ensure that the instruction is not a conditional branch, + * and that can be emulated. + */ + if (!is_conditional_branch(ppc_inst_read(p->ainsn.insn)) && + analyse_instr(&op, ®s, ppc_inst_read(p->ainsn.insn)) == 1) { + emulate_update_regs(®s, &op); + nip = regs.nip; + } + + return nip; +} + +static void optimized_callback(struct optimized_kprobe *op, + struct pt_regs *regs) +{ + /* This is possible if op is under delayed unoptimizing */ + if (kprobe_disabled(&op->kp)) + return; + + preempt_disable(); + + if (kprobe_running()) { + kprobes_inc_nmissed_count(&op->kp); + } else { + __this_cpu_write(current_kprobe, &op->kp); + regs_set_return_ip(regs, (unsigned long)op->kp.addr); + get_kprobe_ctlblk()->kprobe_status = KPROBE_HIT_ACTIVE; + opt_pre_handler(&op->kp, regs); + __this_cpu_write(current_kprobe, NULL); + } + + preempt_enable_no_resched(); +} +NOKPROBE_SYMBOL(optimized_callback); + +void arch_remove_optimized_kprobe(struct optimized_kprobe *op) +{ + if (op->optinsn.insn) { + free_optinsn_slot(op->optinsn.insn, 1); + op->optinsn.insn = NULL; + } +} + +static void patch_imm32_load_insns(unsigned long val, int reg, kprobe_opcode_t *addr) +{ + patch_instruction(addr++, ppc_inst(PPC_RAW_LIS(reg, PPC_HI(val)))); + patch_instruction(addr, ppc_inst(PPC_RAW_ORI(reg, reg, PPC_LO(val)))); +} + +/* + * Generate instructions to load provided immediate 64-bit value + * to register 'reg' and patch these instructions at 'addr'. + */ +static void patch_imm64_load_insns(unsigned long long val, int reg, kprobe_opcode_t *addr) +{ + patch_instruction(addr++, ppc_inst(PPC_RAW_LIS(reg, PPC_HIGHEST(val)))); + patch_instruction(addr++, ppc_inst(PPC_RAW_ORI(reg, reg, PPC_HIGHER(val)))); + patch_instruction(addr++, ppc_inst(PPC_RAW_SLDI(reg, reg, 32))); + patch_instruction(addr++, ppc_inst(PPC_RAW_ORIS(reg, reg, PPC_HI(val)))); + patch_instruction(addr, ppc_inst(PPC_RAW_ORI(reg, reg, PPC_LO(val)))); +} + +static void patch_imm_load_insns(unsigned long val, int reg, kprobe_opcode_t *addr) +{ + if (IS_ENABLED(CONFIG_PPC64)) + patch_imm64_load_insns(val, reg, addr); + else + patch_imm32_load_insns(val, reg, addr); +} + +int arch_prepare_optimized_kprobe(struct optimized_kprobe *op, struct kprobe *p) +{ + ppc_inst_t branch_op_callback, branch_emulate_step, temp; + unsigned long op_callback_addr, emulate_step_addr; + kprobe_opcode_t *buff; + long b_offset; + unsigned long nip, size; + int rc, i; + + nip = can_optimize(p); + if (!nip) + return -EILSEQ; + + /* Allocate instruction slot for detour buffer */ + buff = get_optinsn_slot(); + if (!buff) + return -ENOMEM; + + /* + * OPTPROBE uses 'b' instruction to branch to optinsn.insn. + * + * The target address has to be relatively nearby, to permit use + * of branch instruction in powerpc, because the address is specified + * in an immediate field in the instruction opcode itself, ie 24 bits + * in the opcode specify the address. Therefore the address should + * be within 32MB on either side of the current instruction. + */ + b_offset = (unsigned long)buff - (unsigned long)p->addr; + if (!is_offset_in_branch_range(b_offset)) + goto error; + + /* Check if the return address is also within 32MB range */ + b_offset = (unsigned long)(buff + TMPL_RET_IDX) - nip; + if (!is_offset_in_branch_range(b_offset)) + goto error; + + /* Setup template */ + /* We can optimize this via patch_instruction_window later */ + size = (TMPL_END_IDX * sizeof(kprobe_opcode_t)) / sizeof(int); + pr_devel("Copying template to %p, size %lu\n", buff, size); + for (i = 0; i < size; i++) { + rc = patch_instruction(buff + i, ppc_inst(*(optprobe_template_entry + i))); + if (rc < 0) + goto error; + } + + /* + * Fixup the template with instructions to: + * 1. load the address of the actual probepoint + */ + patch_imm_load_insns((unsigned long)op, 3, buff + TMPL_OP_IDX); + + /* + * 2. branch to optimized_callback() and emulate_step() + */ + op_callback_addr = ppc_kallsyms_lookup_name("optimized_callback"); + emulate_step_addr = ppc_kallsyms_lookup_name("emulate_step"); + if (!op_callback_addr || !emulate_step_addr) { + WARN(1, "Unable to lookup optimized_callback()/emulate_step()\n"); + goto error; + } + + rc = create_branch(&branch_op_callback, buff + TMPL_CALL_HDLR_IDX, + op_callback_addr, BRANCH_SET_LINK); + + rc |= create_branch(&branch_emulate_step, buff + TMPL_EMULATE_IDX, + emulate_step_addr, BRANCH_SET_LINK); + + if (rc) + goto error; + + patch_instruction(buff + TMPL_CALL_HDLR_IDX, branch_op_callback); + patch_instruction(buff + TMPL_EMULATE_IDX, branch_emulate_step); + + /* + * 3. load instruction to be emulated into relevant register, and + */ + temp = ppc_inst_read(p->ainsn.insn); + patch_imm_load_insns(ppc_inst_as_ulong(temp), 4, buff + TMPL_INSN_IDX); + + /* + * 4. branch back from trampoline + */ + patch_branch(buff + TMPL_RET_IDX, nip, 0); + + flush_icache_range((unsigned long)buff, (unsigned long)(&buff[TMPL_END_IDX])); + + op->optinsn.insn = buff; + + return 0; + +error: + free_optinsn_slot(buff, 0); + return -ERANGE; + +} + +int arch_prepared_optinsn(struct arch_optimized_insn *optinsn) +{ + return optinsn->insn != NULL; +} + +/* + * On powerpc, Optprobes always replaces one instruction (4 bytes + * aligned and 4 bytes long). It is impossible to encounter another + * kprobe in this address range. So always return 0. + */ +int arch_check_optimized_kprobe(struct optimized_kprobe *op) +{ + return 0; +} + +void arch_optimize_kprobes(struct list_head *oplist) +{ + ppc_inst_t instr; + struct optimized_kprobe *op; + struct optimized_kprobe *tmp; + + list_for_each_entry_safe(op, tmp, oplist, list) { + /* + * Backup instructions which will be replaced + * by jump address + */ + memcpy(op->optinsn.copied_insn, op->kp.addr, RELATIVEJUMP_SIZE); + create_branch(&instr, op->kp.addr, (unsigned long)op->optinsn.insn, 0); + patch_instruction(op->kp.addr, instr); + list_del_init(&op->list); + } +} + +void arch_unoptimize_kprobe(struct optimized_kprobe *op) +{ + arch_arm_kprobe(&op->kp); +} + +void arch_unoptimize_kprobes(struct list_head *oplist, struct list_head *done_list) +{ + struct optimized_kprobe *op; + struct optimized_kprobe *tmp; + + list_for_each_entry_safe(op, tmp, oplist, list) { + arch_unoptimize_kprobe(op); + list_move(&op->list, done_list); + } +} + +int arch_within_optimized_kprobe(struct optimized_kprobe *op, kprobe_opcode_t *addr) +{ + return (op->kp.addr <= addr && + op->kp.addr + (RELATIVEJUMP_SIZE / sizeof(kprobe_opcode_t)) > addr); +} diff --git a/arch/powerpc/kernel/optprobes_head.S b/arch/powerpc/kernel/optprobes_head.S new file mode 100644 index 000000000..cd4e7bc32 --- /dev/null +++ b/arch/powerpc/kernel/optprobes_head.S @@ -0,0 +1,136 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Code to prepare detour buffer for optprobes in Kernel. + * + * Copyright 2017, Anju T, IBM Corp. + */ + +#include <asm/ppc_asm.h> +#include <asm/ptrace.h> +#include <asm/asm-offsets.h> + +#ifdef CONFIG_PPC64 +#define SAVE_30GPRS(base) SAVE_GPRS(2, 31, base) +#define REST_30GPRS(base) REST_GPRS(2, 31, base) +#define TEMPLATE_FOR_IMM_LOAD_INSNS nop; nop; nop; nop; nop +#else +#define SAVE_30GPRS(base) stmw r2, GPR2(base) +#define REST_30GPRS(base) lmw r2, GPR2(base) +#define TEMPLATE_FOR_IMM_LOAD_INSNS nop; nop; nop +#endif + +#define OPT_SLOT_SIZE 65536 + + .balign 4 + + /* + * Reserve an area to allocate slots for detour buffer. + * This is part of .text section (rather than vmalloc area) + * as this needs to be within 32MB of the probed address. + */ + .global optinsn_slot +optinsn_slot: + .space OPT_SLOT_SIZE + + /* + * Optprobe template: + * This template gets copied into one of the slots in optinsn_slot + * and gets fixed up with real optprobe structures et al. + */ + .global optprobe_template_entry +optprobe_template_entry: + /* Create an in-memory pt_regs */ + PPC_STLU r1,-INT_FRAME_SIZE(r1) + SAVE_GPR(0,r1) + /* Save the previous SP into stack */ + addi r0,r1,INT_FRAME_SIZE + PPC_STL r0,GPR1(r1) + SAVE_30GPRS(r1) + /* Save SPRS */ + mfmsr r5 + PPC_STL r5,_MSR(r1) + li r5,0x700 + PPC_STL r5,_TRAP(r1) + li r5,0 + PPC_STL r5,ORIG_GPR3(r1) + PPC_STL r5,RESULT(r1) + mfctr r5 + PPC_STL r5,_CTR(r1) + mflr r5 + PPC_STL r5,_LINK(r1) + mfspr r5,SPRN_XER + PPC_STL r5,_XER(r1) + mfcr r5 + PPC_STL r5,_CCR(r1) +#ifdef CONFIG_PPC64 + lbz r5,PACAIRQSOFTMASK(r13) + std r5,SOFTE(r1) +#endif + + /* + * We may get here from a module, so load the kernel TOC in r2. + * The original TOC gets restored when pt_regs is restored + * further below. + */ +#ifdef CONFIG_PPC64 + LOAD_PACA_TOC() +#endif + + .global optprobe_template_op_address +optprobe_template_op_address: + /* + * Parameters to optimized_callback(): + * 1. optimized_kprobe structure in r3 + */ + TEMPLATE_FOR_IMM_LOAD_INSNS + + /* 2. pt_regs pointer in r4 */ + addi r4,r1,STACK_FRAME_OVERHEAD + + .global optprobe_template_call_handler +optprobe_template_call_handler: + /* Branch to optimized_callback() */ + nop + + /* + * Parameters for instruction emulation: + * 1. Pass SP in register r3. + */ + addi r3,r1,STACK_FRAME_OVERHEAD + + .global optprobe_template_insn +optprobe_template_insn: + /* 2, Pass instruction to be emulated in r4 */ + TEMPLATE_FOR_IMM_LOAD_INSNS + + .global optprobe_template_call_emulate +optprobe_template_call_emulate: + /* Branch to emulate_step() */ + nop + + /* + * All done. + * Now, restore the registers... + */ + PPC_LL r5,_MSR(r1) + mtmsr r5 + PPC_LL r5,_CTR(r1) + mtctr r5 + PPC_LL r5,_LINK(r1) + mtlr r5 + PPC_LL r5,_XER(r1) + mtxer r5 + PPC_LL r5,_CCR(r1) + mtcr r5 + REST_GPR(0,r1) + REST_30GPRS(r1) + /* Restore the previous SP */ + addi r1,r1,INT_FRAME_SIZE + + .global optprobe_template_ret +optprobe_template_ret: + /* ... and jump back from trampoline */ + nop + + .global optprobe_template_end +optprobe_template_end: diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c new file mode 100644 index 000000000..be8db402e --- /dev/null +++ b/arch/powerpc/kernel/paca.c @@ -0,0 +1,321 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * c 2001 PPC 64 Team, IBM Corp + */ + +#include <linux/smp.h> +#include <linux/export.h> +#include <linux/memblock.h> +#include <linux/sched/task.h> +#include <linux/numa.h> +#include <linux/pgtable.h> + +#include <asm/lppaca.h> +#include <asm/paca.h> +#include <asm/sections.h> +#include <asm/kexec.h> +#include <asm/svm.h> +#include <asm/ultravisor.h> + +#include "setup.h" + +#ifndef CONFIG_SMP +#define boot_cpuid 0 +#endif + +static void *__init alloc_paca_data(unsigned long size, unsigned long align, + unsigned long limit, int cpu) +{ + void *ptr; + int nid; + + /* + * boot_cpuid paca is allocated very early before cpu_to_node is up. + * Set bottom-up mode, because the boot CPU should be on node-0, + * which will put its paca in the right place. + */ + if (cpu == boot_cpuid) { + nid = NUMA_NO_NODE; + memblock_set_bottom_up(true); + } else { + nid = early_cpu_to_node(cpu); + } + + ptr = memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT, + limit, nid); + if (!ptr) + panic("cannot allocate paca data"); + + if (cpu == boot_cpuid) + memblock_set_bottom_up(false); + + return ptr; +} + +#ifdef CONFIG_PPC_PSERIES + +#define LPPACA_SIZE 0x400 + +static void *__init alloc_shared_lppaca(unsigned long size, unsigned long limit, + int cpu) +{ + size_t shared_lppaca_total_size = PAGE_ALIGN(nr_cpu_ids * LPPACA_SIZE); + static unsigned long shared_lppaca_size; + static void *shared_lppaca; + void *ptr; + + if (!shared_lppaca) { + memblock_set_bottom_up(true); + + /* + * See Documentation/powerpc/ultravisor.rst for more details. + * + * UV/HV data sharing is in PAGE_SIZE granularity. In order to + * minimize the number of pages shared, align the allocation to + * PAGE_SIZE. + */ + shared_lppaca = + memblock_alloc_try_nid(shared_lppaca_total_size, + PAGE_SIZE, MEMBLOCK_LOW_LIMIT, + limit, NUMA_NO_NODE); + if (!shared_lppaca) + panic("cannot allocate shared data"); + + memblock_set_bottom_up(false); + uv_share_page(PHYS_PFN(__pa(shared_lppaca)), + shared_lppaca_total_size >> PAGE_SHIFT); + } + + ptr = shared_lppaca + shared_lppaca_size; + shared_lppaca_size += size; + + /* + * This is very early in boot, so no harm done if the kernel crashes at + * this point. + */ + BUG_ON(shared_lppaca_size > shared_lppaca_total_size); + + return ptr; +} + +/* + * See asm/lppaca.h for more detail. + * + * lppaca structures must must be 1kB in size, L1 cache line aligned, + * and not cross 4kB boundary. A 1kB size and 1kB alignment will satisfy + * these requirements. + */ +static inline void init_lppaca(struct lppaca *lppaca) +{ + BUILD_BUG_ON(sizeof(struct lppaca) != 640); + + *lppaca = (struct lppaca) { + .desc = cpu_to_be32(0xd397d781), /* "LpPa" */ + .size = cpu_to_be16(LPPACA_SIZE), + .fpregs_in_use = 1, + .slb_count = cpu_to_be16(64), + .vmxregs_in_use = 0, + .page_ins = 0, }; +}; + +static struct lppaca * __init new_lppaca(int cpu, unsigned long limit) +{ + struct lppaca *lp; + + BUILD_BUG_ON(sizeof(struct lppaca) > LPPACA_SIZE); + + if (early_cpu_has_feature(CPU_FTR_HVMODE)) + return NULL; + + if (is_secure_guest()) + lp = alloc_shared_lppaca(LPPACA_SIZE, limit, cpu); + else + lp = alloc_paca_data(LPPACA_SIZE, 0x400, limit, cpu); + + init_lppaca(lp); + + return lp; +} +#endif /* CONFIG_PPC_PSERIES */ + +#ifdef CONFIG_PPC_64S_HASH_MMU +/* + * 3 persistent SLBs are allocated here. The buffer will be zero + * initially, hence will all be invaild until we actually write them. + * + * If you make the number of persistent SLB entries dynamic, please also + * update PR KVM to flush and restore them accordingly. + */ +static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit) +{ + struct slb_shadow *s; + + if (cpu != boot_cpuid) { + /* + * Boot CPU comes here before early_radix_enabled + * is parsed (e.g., for disable_radix). So allocate + * always and this will be fixed up in free_unused_pacas. + */ + if (early_radix_enabled()) + return NULL; + } + + s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu); + + s->persistent = cpu_to_be32(SLB_NUM_BOLTED); + s->buffer_length = cpu_to_be32(sizeof(*s)); + + return s; +} +#endif /* CONFIG_PPC_64S_HASH_MMU */ + +/* The Paca is an array with one entry per processor. Each contains an + * lppaca, which contains the information shared between the + * hypervisor and Linux. + * On systems with hardware multi-threading, there are two threads + * per processor. The Paca array must contain an entry for each thread. + * The VPD Areas will give a max logical processors = 2 * max physical + * processors. The processor VPD array needs one entry per physical + * processor (not thread). + */ +struct paca_struct **paca_ptrs __read_mostly; +EXPORT_SYMBOL(paca_ptrs); + +void __init initialise_paca(struct paca_struct *new_paca, int cpu) +{ +#ifdef CONFIG_PPC_PSERIES + new_paca->lppaca_ptr = NULL; +#endif +#ifdef CONFIG_PPC_BOOK3E_64 + new_paca->kernel_pgd = swapper_pg_dir; +#endif + new_paca->lock_token = 0x8000; + new_paca->paca_index = cpu; + new_paca->kernel_toc = kernel_toc_addr(); + new_paca->kernelbase = (unsigned long) _stext; + /* Only set MSR:IR/DR when MMU is initialized */ + new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR); + new_paca->hw_cpu_id = 0xffff; + new_paca->kexec_state = KEXEC_STATE_NONE; + new_paca->__current = &init_task; + new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL; +#ifdef CONFIG_PPC_64S_HASH_MMU + new_paca->slb_shadow_ptr = NULL; +#endif + +#ifdef CONFIG_PPC_BOOK3E_64 + /* For now -- if we have threads this will be adjusted later */ + new_paca->tcd_ptr = &new_paca->tcd; +#endif +} + +/* Put the paca pointer into r13 and SPRG_PACA */ +void setup_paca(struct paca_struct *new_paca) +{ + /* Setup r13 */ + local_paca = new_paca; + +#ifdef CONFIG_PPC_BOOK3E_64 + /* On Book3E, initialize the TLB miss exception frames */ + mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); +#else + /* + * In HV mode, we setup both HPACA and PACA to avoid problems + * if we do a GET_PACA() before the feature fixups have been + * applied. + * + * Normally you should test against CPU_FTR_HVMODE, but CPU features + * are not yet set up when we first reach here. + */ + if (mfmsr() & MSR_HV) + mtspr(SPRN_SPRG_HPACA, local_paca); +#endif + mtspr(SPRN_SPRG_PACA, local_paca); + +} + +static int __initdata paca_nr_cpu_ids; +static int __initdata paca_ptrs_size; +static int __initdata paca_struct_size; + +void __init allocate_paca_ptrs(void) +{ + paca_nr_cpu_ids = nr_cpu_ids; + + paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; + paca_ptrs = memblock_alloc_raw(paca_ptrs_size, SMP_CACHE_BYTES); + if (!paca_ptrs) + panic("Failed to allocate %d bytes for paca pointers\n", + paca_ptrs_size); + + memset(paca_ptrs, 0x88, paca_ptrs_size); +} + +void __init allocate_paca(int cpu) +{ + u64 limit; + struct paca_struct *paca; + + BUG_ON(cpu >= paca_nr_cpu_ids); + +#ifdef CONFIG_PPC_BOOK3S_64 + /* + * We access pacas in real mode, and cannot take SLB faults + * on them when in virtual mode, so allocate them accordingly. + */ + limit = min(ppc64_bolted_size(), ppc64_rma_size); +#else + limit = ppc64_rma_size; +#endif + + paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES, + limit, cpu); + paca_ptrs[cpu] = paca; + + initialise_paca(paca, cpu); +#ifdef CONFIG_PPC_PSERIES + paca->lppaca_ptr = new_lppaca(cpu, limit); +#endif +#ifdef CONFIG_PPC_64S_HASH_MMU + paca->slb_shadow_ptr = new_slb_shadow(cpu, limit); +#endif + paca_struct_size += sizeof(struct paca_struct); +} + +void __init free_unused_pacas(void) +{ + int new_ptrs_size; + + new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; + if (new_ptrs_size < paca_ptrs_size) + memblock_phys_free(__pa(paca_ptrs) + new_ptrs_size, + paca_ptrs_size - new_ptrs_size); + + paca_nr_cpu_ids = nr_cpu_ids; + paca_ptrs_size = new_ptrs_size; + +#ifdef CONFIG_PPC_64S_HASH_MMU + if (early_radix_enabled()) { + /* Ugly fixup, see new_slb_shadow() */ + memblock_phys_free(__pa(paca_ptrs[boot_cpuid]->slb_shadow_ptr), + sizeof(struct slb_shadow)); + paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL; + } +#endif + + printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n", + paca_ptrs_size + paca_struct_size, nr_cpu_ids); +} + +#ifdef CONFIG_PPC_64S_HASH_MMU +void copy_mm_to_paca(struct mm_struct *mm) +{ + mm_context_t *context = &mm->context; + + VM_BUG_ON(!mm_ctx_slb_addr_limit(context)); + memcpy(&get_paca()->mm_ctx_low_slices_psize, mm_ctx_low_slices(context), + LOW_SLICE_ARRAY_SZ); + memcpy(&get_paca()->mm_ctx_high_slices_psize, mm_ctx_high_slices(context), + TASK_SLICE_ARRAY_SZ(context)); +} +#endif /* CONFIG_PPC_64S_HASH_MMU */ diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c new file mode 100644 index 000000000..d67cf79bf --- /dev/null +++ b/arch/powerpc/kernel/pci-common.c @@ -0,0 +1,1735 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Contains common pci routines for ALL ppc platform + * (based on pci_32.c and pci_64.c) + * + * Port for PPC64 David Engebretsen, IBM Corp. + * Contains common pci routines for ppc64 platform, pSeries and iSeries brands. + * + * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM + * Rework, based on alpha PCI code. + * + * Common pmac/prep/chrp pci routines. -- Cort + */ + +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/export.h> +#include <linux/of_address.h> +#include <linux/of_pci.h> +#include <linux/mm.h> +#include <linux/shmem_fs.h> +#include <linux/list.h> +#include <linux/syscalls.h> +#include <linux/irq.h> +#include <linux/vmalloc.h> +#include <linux/slab.h> +#include <linux/vgaarb.h> +#include <linux/numa.h> +#include <linux/msi.h> +#include <linux/irqdomain.h> + +#include <asm/processor.h> +#include <asm/io.h> +#include <asm/pci-bridge.h> +#include <asm/byteorder.h> +#include <asm/machdep.h> +#include <asm/ppc-pci.h> +#include <asm/eeh.h> +#include <asm/setup.h> + +#include "../../../drivers/pci/pci.h" + +/* hose_spinlock protects accesses to the phb_bitmap. */ +static DEFINE_SPINLOCK(hose_spinlock); +LIST_HEAD(hose_list); + +/* For dynamic PHB numbering on get_phb_number(): max number of PHBs. */ +#define MAX_PHBS 0x10000 + +/* + * For dynamic PHB numbering: used/free PHBs tracking bitmap. + * Accesses to this bitmap should be protected by hose_spinlock. + */ +static DECLARE_BITMAP(phb_bitmap, MAX_PHBS); + +/* ISA Memory physical address */ +resource_size_t isa_mem_base; +EXPORT_SYMBOL(isa_mem_base); + + +static const struct dma_map_ops *pci_dma_ops; + +void __init set_pci_dma_ops(const struct dma_map_ops *dma_ops) +{ + pci_dma_ops = dma_ops; +} + +static int get_phb_number(struct device_node *dn) +{ + int ret, phb_id = -1; + u64 prop; + + /* + * Try fixed PHB numbering first, by checking archs and reading + * the respective device-tree properties. Firstly, try reading + * standard "linux,pci-domain", then try reading "ibm,opal-phbid" + * (only present in powernv OPAL environment), then try device-tree + * alias and as the last try to use lower bits of "reg" property. + */ + ret = of_get_pci_domain_nr(dn); + if (ret >= 0) { + prop = ret; + ret = 0; + } + if (ret) + ret = of_property_read_u64(dn, "ibm,opal-phbid", &prop); + + if (ret) { + ret = of_alias_get_id(dn, "pci"); + if (ret >= 0) { + prop = ret; + ret = 0; + } + } + if (ret) { + u32 prop_32; + ret = of_property_read_u32_index(dn, "reg", 1, &prop_32); + prop = prop_32; + } + + if (!ret) + phb_id = (int)(prop & (MAX_PHBS - 1)); + + spin_lock(&hose_spinlock); + + /* We need to be sure to not use the same PHB number twice. */ + if ((phb_id >= 0) && !test_and_set_bit(phb_id, phb_bitmap)) + goto out_unlock; + + /* If everything fails then fallback to dynamic PHB numbering. */ + phb_id = find_first_zero_bit(phb_bitmap, MAX_PHBS); + BUG_ON(phb_id >= MAX_PHBS); + set_bit(phb_id, phb_bitmap); + +out_unlock: + spin_unlock(&hose_spinlock); + + return phb_id; +} + +struct pci_controller *pcibios_alloc_controller(struct device_node *dev) +{ + struct pci_controller *phb; + + phb = zalloc_maybe_bootmem(sizeof(struct pci_controller), GFP_KERNEL); + if (phb == NULL) + return NULL; + + phb->global_number = get_phb_number(dev); + + spin_lock(&hose_spinlock); + list_add_tail(&phb->list_node, &hose_list); + spin_unlock(&hose_spinlock); + + phb->dn = of_node_get(dev); + phb->is_dynamic = slab_is_available(); +#ifdef CONFIG_PPC64 + if (dev) { + int nid = of_node_to_nid(dev); + + if (nid < 0 || !node_online(nid)) + nid = NUMA_NO_NODE; + + PHB_SET_NODE(phb, nid); + } +#endif + return phb; +} +EXPORT_SYMBOL_GPL(pcibios_alloc_controller); + +void pcibios_free_controller(struct pci_controller *phb) +{ + spin_lock(&hose_spinlock); + + /* Clear bit of phb_bitmap to allow reuse of this PHB number. */ + if (phb->global_number < MAX_PHBS) + clear_bit(phb->global_number, phb_bitmap); + of_node_put(phb->dn); + list_del(&phb->list_node); + spin_unlock(&hose_spinlock); + + if (phb->is_dynamic) + kfree(phb); +} +EXPORT_SYMBOL_GPL(pcibios_free_controller); + +/* + * This function is used to call pcibios_free_controller() + * in a deferred manner: a callback from the PCI subsystem. + * + * _*DO NOT*_ call pcibios_free_controller() explicitly if + * this is used (or it may access an invalid *phb pointer). + * + * The callback occurs when all references to the root bus + * are dropped (e.g., child buses/devices and their users). + * + * It's called as .release_fn() of 'struct pci_host_bridge' + * which is associated with the 'struct pci_controller.bus' + * (root bus) - it expects .release_data to hold a pointer + * to 'struct pci_controller'. + * + * In order to use it, register .release_fn()/release_data + * like this: + * + * pci_set_host_bridge_release(bridge, + * pcibios_free_controller_deferred + * (void *) phb); + * + * e.g. in the pcibios_root_bridge_prepare() callback from + * pci_create_root_bus(). + */ +void pcibios_free_controller_deferred(struct pci_host_bridge *bridge) +{ + struct pci_controller *phb = (struct pci_controller *) + bridge->release_data; + + pr_debug("domain %d, dynamic %d\n", phb->global_number, phb->is_dynamic); + + pcibios_free_controller(phb); +} +EXPORT_SYMBOL_GPL(pcibios_free_controller_deferred); + +/* + * The function is used to return the minimal alignment + * for memory or I/O windows of the associated P2P bridge. + * By default, 4KiB alignment for I/O windows and 1MiB for + * memory windows. + */ +resource_size_t pcibios_window_alignment(struct pci_bus *bus, + unsigned long type) +{ + struct pci_controller *phb = pci_bus_to_host(bus); + + if (phb->controller_ops.window_alignment) + return phb->controller_ops.window_alignment(bus, type); + + /* + * PCI core will figure out the default + * alignment: 4KiB for I/O and 1MiB for + * memory window. + */ + return 1; +} + +void pcibios_setup_bridge(struct pci_bus *bus, unsigned long type) +{ + struct pci_controller *hose = pci_bus_to_host(bus); + + if (hose->controller_ops.setup_bridge) + hose->controller_ops.setup_bridge(bus, type); +} + +void pcibios_reset_secondary_bus(struct pci_dev *dev) +{ + struct pci_controller *phb = pci_bus_to_host(dev->bus); + + if (phb->controller_ops.reset_secondary_bus) { + phb->controller_ops.reset_secondary_bus(dev); + return; + } + + pci_reset_secondary_bus(dev); +} + +resource_size_t pcibios_default_alignment(void) +{ + if (ppc_md.pcibios_default_alignment) + return ppc_md.pcibios_default_alignment(); + + return 0; +} + +#ifdef CONFIG_PCI_IOV +resource_size_t pcibios_iov_resource_alignment(struct pci_dev *pdev, int resno) +{ + if (ppc_md.pcibios_iov_resource_alignment) + return ppc_md.pcibios_iov_resource_alignment(pdev, resno); + + return pci_iov_resource_size(pdev, resno); +} + +int pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs) +{ + if (ppc_md.pcibios_sriov_enable) + return ppc_md.pcibios_sriov_enable(pdev, num_vfs); + + return 0; +} + +int pcibios_sriov_disable(struct pci_dev *pdev) +{ + if (ppc_md.pcibios_sriov_disable) + return ppc_md.pcibios_sriov_disable(pdev); + + return 0; +} + +#endif /* CONFIG_PCI_IOV */ + +static resource_size_t pcibios_io_size(const struct pci_controller *hose) +{ +#ifdef CONFIG_PPC64 + return hose->pci_io_size; +#else + return resource_size(&hose->io_resource); +#endif +} + +int pcibios_vaddr_is_ioport(void __iomem *address) +{ + int ret = 0; + struct pci_controller *hose; + resource_size_t size; + + spin_lock(&hose_spinlock); + list_for_each_entry(hose, &hose_list, list_node) { + size = pcibios_io_size(hose); + if (address >= hose->io_base_virt && + address < (hose->io_base_virt + size)) { + ret = 1; + break; + } + } + spin_unlock(&hose_spinlock); + return ret; +} + +unsigned long pci_address_to_pio(phys_addr_t address) +{ + struct pci_controller *hose; + resource_size_t size; + unsigned long ret = ~0; + + spin_lock(&hose_spinlock); + list_for_each_entry(hose, &hose_list, list_node) { + size = pcibios_io_size(hose); + if (address >= hose->io_base_phys && + address < (hose->io_base_phys + size)) { + unsigned long base = + (unsigned long)hose->io_base_virt - _IO_BASE; + ret = base + (address - hose->io_base_phys); + break; + } + } + spin_unlock(&hose_spinlock); + + return ret; +} +EXPORT_SYMBOL_GPL(pci_address_to_pio); + +/* + * Return the domain number for this bus. + */ +int pci_domain_nr(struct pci_bus *bus) +{ + struct pci_controller *hose = pci_bus_to_host(bus); + + return hose->global_number; +} +EXPORT_SYMBOL(pci_domain_nr); + +/* This routine is meant to be used early during boot, when the + * PCI bus numbers have not yet been assigned, and you need to + * issue PCI config cycles to an OF device. + * It could also be used to "fix" RTAS config cycles if you want + * to set pci_assign_all_buses to 1 and still use RTAS for PCI + * config cycles. + */ +struct pci_controller* pci_find_hose_for_OF_device(struct device_node* node) +{ + while(node) { + struct pci_controller *hose, *tmp; + list_for_each_entry_safe(hose, tmp, &hose_list, list_node) + if (hose->dn == node) + return hose; + node = node->parent; + } + return NULL; +} + +struct pci_controller *pci_find_controller_for_domain(int domain_nr) +{ + struct pci_controller *hose; + + list_for_each_entry(hose, &hose_list, list_node) + if (hose->global_number == domain_nr) + return hose; + + return NULL; +} + +struct pci_intx_virq { + int virq; + struct kref kref; + struct list_head list_node; +}; + +static LIST_HEAD(intx_list); +static DEFINE_MUTEX(intx_mutex); + +static void ppc_pci_intx_release(struct kref *kref) +{ + struct pci_intx_virq *vi = container_of(kref, struct pci_intx_virq, kref); + + list_del(&vi->list_node); + irq_dispose_mapping(vi->virq); + kfree(vi); +} + +static int ppc_pci_unmap_irq_line(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct pci_dev *pdev = to_pci_dev(data); + + if (action == BUS_NOTIFY_DEL_DEVICE) { + struct pci_intx_virq *vi; + + mutex_lock(&intx_mutex); + list_for_each_entry(vi, &intx_list, list_node) { + if (vi->virq == pdev->irq) { + kref_put(&vi->kref, ppc_pci_intx_release); + break; + } + } + mutex_unlock(&intx_mutex); + } + + return NOTIFY_DONE; +} + +static struct notifier_block ppc_pci_unmap_irq_notifier = { + .notifier_call = ppc_pci_unmap_irq_line, +}; + +static int ppc_pci_register_irq_notifier(void) +{ + return bus_register_notifier(&pci_bus_type, &ppc_pci_unmap_irq_notifier); +} +arch_initcall(ppc_pci_register_irq_notifier); + +/* + * Reads the interrupt pin to determine if interrupt is use by card. + * If the interrupt is used, then gets the interrupt line from the + * openfirmware and sets it in the pci_dev and pci_config line. + */ +static int pci_read_irq_line(struct pci_dev *pci_dev) +{ + int virq; + struct pci_intx_virq *vi, *vitmp; + + /* Preallocate vi as rewind is complex if this fails after mapping */ + vi = kzalloc(sizeof(struct pci_intx_virq), GFP_KERNEL); + if (!vi) + return -1; + + pr_debug("PCI: Try to map irq for %s...\n", pci_name(pci_dev)); + + /* Try to get a mapping from the device-tree */ + virq = of_irq_parse_and_map_pci(pci_dev, 0, 0); + if (virq <= 0) { + u8 line, pin; + + /* If that fails, lets fallback to what is in the config + * space and map that through the default controller. We + * also set the type to level low since that's what PCI + * interrupts are. If your platform does differently, then + * either provide a proper interrupt tree or don't use this + * function. + */ + if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_PIN, &pin)) + goto error_exit; + if (pin == 0) + goto error_exit; + if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_LINE, &line) || + line == 0xff || line == 0) { + goto error_exit; + } + pr_debug(" No map ! Using line %d (pin %d) from PCI config\n", + line, pin); + + virq = irq_create_mapping(NULL, line); + if (virq) + irq_set_irq_type(virq, IRQ_TYPE_LEVEL_LOW); + } + + if (!virq) { + pr_debug(" Failed to map !\n"); + goto error_exit; + } + + pr_debug(" Mapped to linux irq %d\n", virq); + + pci_dev->irq = virq; + + mutex_lock(&intx_mutex); + list_for_each_entry(vitmp, &intx_list, list_node) { + if (vitmp->virq == virq) { + kref_get(&vitmp->kref); + kfree(vi); + vi = NULL; + break; + } + } + if (vi) { + vi->virq = virq; + kref_init(&vi->kref); + list_add_tail(&vi->list_node, &intx_list); + } + mutex_unlock(&intx_mutex); + + return 0; +error_exit: + kfree(vi); + return -1; +} + +/* + * Platform support for /proc/bus/pci/X/Y mmap()s. + * -- paulus. + */ +int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma) +{ + struct pci_controller *hose = pci_bus_to_host(pdev->bus); + resource_size_t ioaddr = pci_resource_start(pdev, bar); + + if (!hose) + return -EINVAL; + + /* Convert to an offset within this PCI controller */ + ioaddr -= (unsigned long)hose->io_base_virt - _IO_BASE; + + vma->vm_pgoff += (ioaddr + hose->io_base_phys) >> PAGE_SHIFT; + return 0; +} + +/* + * This one is used by /dev/mem and fbdev who have no clue about the + * PCI device, it tries to find the PCI device first and calls the + * above routine + */ +pgprot_t pci_phys_mem_access_prot(struct file *file, + unsigned long pfn, + unsigned long size, + pgprot_t prot) +{ + struct pci_dev *pdev = NULL; + struct resource *found = NULL; + resource_size_t offset = ((resource_size_t)pfn) << PAGE_SHIFT; + int i; + + if (page_is_ram(pfn)) + return prot; + + prot = pgprot_noncached(prot); + for_each_pci_dev(pdev) { + for (i = 0; i <= PCI_ROM_RESOURCE; i++) { + struct resource *rp = &pdev->resource[i]; + int flags = rp->flags; + + /* Active and same type? */ + if ((flags & IORESOURCE_MEM) == 0) + continue; + /* In the range of this resource? */ + if (offset < (rp->start & PAGE_MASK) || + offset > rp->end) + continue; + found = rp; + break; + } + if (found) + break; + } + if (found) { + if (found->flags & IORESOURCE_PREFETCH) + prot = pgprot_noncached_wc(prot); + pci_dev_put(pdev); + } + + pr_debug("PCI: Non-PCI map for %llx, prot: %lx\n", + (unsigned long long)offset, pgprot_val(prot)); + + return prot; +} + +/* This provides legacy IO read access on a bus */ +int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size) +{ + unsigned long offset; + struct pci_controller *hose = pci_bus_to_host(bus); + struct resource *rp = &hose->io_resource; + void __iomem *addr; + + /* Check if port can be supported by that bus. We only check + * the ranges of the PHB though, not the bus itself as the rules + * for forwarding legacy cycles down bridges are not our problem + * here. So if the host bridge supports it, we do it. + */ + offset = (unsigned long)hose->io_base_virt - _IO_BASE; + offset += port; + + if (!(rp->flags & IORESOURCE_IO)) + return -ENXIO; + if (offset < rp->start || (offset + size) > rp->end) + return -ENXIO; + addr = hose->io_base_virt + port; + + switch(size) { + case 1: + *((u8 *)val) = in_8(addr); + return 1; + case 2: + if (port & 1) + return -EINVAL; + *((u16 *)val) = in_le16(addr); + return 2; + case 4: + if (port & 3) + return -EINVAL; + *((u32 *)val) = in_le32(addr); + return 4; + } + return -EINVAL; +} + +/* This provides legacy IO write access on a bus */ +int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size) +{ + unsigned long offset; + struct pci_controller *hose = pci_bus_to_host(bus); + struct resource *rp = &hose->io_resource; + void __iomem *addr; + + /* Check if port can be supported by that bus. We only check + * the ranges of the PHB though, not the bus itself as the rules + * for forwarding legacy cycles down bridges are not our problem + * here. So if the host bridge supports it, we do it. + */ + offset = (unsigned long)hose->io_base_virt - _IO_BASE; + offset += port; + + if (!(rp->flags & IORESOURCE_IO)) + return -ENXIO; + if (offset < rp->start || (offset + size) > rp->end) + return -ENXIO; + addr = hose->io_base_virt + port; + + /* WARNING: The generic code is idiotic. It gets passed a pointer + * to what can be a 1, 2 or 4 byte quantity and always reads that + * as a u32, which means that we have to correct the location of + * the data read within those 32 bits for size 1 and 2 + */ + switch(size) { + case 1: + out_8(addr, val >> 24); + return 1; + case 2: + if (port & 1) + return -EINVAL; + out_le16(addr, val >> 16); + return 2; + case 4: + if (port & 3) + return -EINVAL; + out_le32(addr, val); + return 4; + } + return -EINVAL; +} + +/* This provides legacy IO or memory mmap access on a bus */ +int pci_mmap_legacy_page_range(struct pci_bus *bus, + struct vm_area_struct *vma, + enum pci_mmap_state mmap_state) +{ + struct pci_controller *hose = pci_bus_to_host(bus); + resource_size_t offset = + ((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT; + resource_size_t size = vma->vm_end - vma->vm_start; + struct resource *rp; + + pr_debug("pci_mmap_legacy_page_range(%04x:%02x, %s @%llx..%llx)\n", + pci_domain_nr(bus), bus->number, + mmap_state == pci_mmap_mem ? "MEM" : "IO", + (unsigned long long)offset, + (unsigned long long)(offset + size - 1)); + + if (mmap_state == pci_mmap_mem) { + /* Hack alert ! + * + * Because X is lame and can fail starting if it gets an error trying + * to mmap legacy_mem (instead of just moving on without legacy memory + * access) we fake it here by giving it anonymous memory, effectively + * behaving just like /dev/zero + */ + if ((offset + size) > hose->isa_mem_size) { + printk(KERN_DEBUG + "Process %s (pid:%d) mapped non-existing PCI legacy memory for 0%04x:%02x\n", + current->comm, current->pid, pci_domain_nr(bus), bus->number); + if (vma->vm_flags & VM_SHARED) + return shmem_zero_setup(vma); + return 0; + } + offset += hose->isa_mem_phys; + } else { + unsigned long io_offset = (unsigned long)hose->io_base_virt - _IO_BASE; + unsigned long roffset = offset + io_offset; + rp = &hose->io_resource; + if (!(rp->flags & IORESOURCE_IO)) + return -ENXIO; + if (roffset < rp->start || (roffset + size) > rp->end) + return -ENXIO; + offset += hose->io_base_phys; + } + pr_debug(" -> mapping phys %llx\n", (unsigned long long)offset); + + vma->vm_pgoff = offset >> PAGE_SHIFT; + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, + vma->vm_end - vma->vm_start, + vma->vm_page_prot); +} + +void pci_resource_to_user(const struct pci_dev *dev, int bar, + const struct resource *rsrc, + resource_size_t *start, resource_size_t *end) +{ + struct pci_bus_region region; + + if (rsrc->flags & IORESOURCE_IO) { + pcibios_resource_to_bus(dev->bus, ®ion, + (struct resource *) rsrc); + *start = region.start; + *end = region.end; + return; + } + + /* We pass a CPU physical address to userland for MMIO instead of a + * BAR value because X is lame and expects to be able to use that + * to pass to /dev/mem! + * + * That means we may have 64-bit values where some apps only expect + * 32 (like X itself since it thinks only Sparc has 64-bit MMIO). + */ + *start = rsrc->start; + *end = rsrc->end; +} + +/** + * pci_process_bridge_OF_ranges - Parse PCI bridge resources from device tree + * @hose: newly allocated pci_controller to be setup + * @dev: device node of the host bridge + * @primary: set if primary bus (32 bits only, soon to be deprecated) + * + * This function will parse the "ranges" property of a PCI host bridge device + * node and setup the resource mapping of a pci controller based on its + * content. + * + * Life would be boring if it wasn't for a few issues that we have to deal + * with here: + * + * - We can only cope with one IO space range and up to 3 Memory space + * ranges. However, some machines (thanks Apple !) tend to split their + * space into lots of small contiguous ranges. So we have to coalesce. + * + * - Some busses have IO space not starting at 0, which causes trouble with + * the way we do our IO resource renumbering. The code somewhat deals with + * it for 64 bits but I would expect problems on 32 bits. + * + * - Some 32 bits platforms such as 4xx can have physical space larger than + * 32 bits so we need to use 64 bits values for the parsing + */ +void pci_process_bridge_OF_ranges(struct pci_controller *hose, + struct device_node *dev, int primary) +{ + int memno = 0; + struct resource *res; + struct of_pci_range range; + struct of_pci_range_parser parser; + + printk(KERN_INFO "PCI host bridge %pOF %s ranges:\n", + dev, primary ? "(primary)" : ""); + + /* Check for ranges property */ + if (of_pci_range_parser_init(&parser, dev)) + return; + + /* Parse it */ + for_each_of_pci_range(&parser, &range) { + /* If we failed translation or got a zero-sized region + * (some FW try to feed us with non sensical zero sized regions + * such as power3 which look like some kind of attempt at exposing + * the VGA memory hole) + */ + if (range.cpu_addr == OF_BAD_ADDR || range.size == 0) + continue; + + /* Act based on address space type */ + res = NULL; + switch (range.flags & IORESOURCE_TYPE_BITS) { + case IORESOURCE_IO: + printk(KERN_INFO + " IO 0x%016llx..0x%016llx -> 0x%016llx\n", + range.cpu_addr, range.cpu_addr + range.size - 1, + range.pci_addr); + + /* We support only one IO range */ + if (hose->pci_io_size) { + printk(KERN_INFO + " \\--> Skipped (too many) !\n"); + continue; + } +#ifdef CONFIG_PPC32 + /* On 32 bits, limit I/O space to 16MB */ + if (range.size > 0x01000000) + range.size = 0x01000000; + + /* 32 bits needs to map IOs here */ + hose->io_base_virt = ioremap(range.cpu_addr, + range.size); + + /* Expect trouble if pci_addr is not 0 */ + if (primary) + isa_io_base = + (unsigned long)hose->io_base_virt; +#endif /* CONFIG_PPC32 */ + /* pci_io_size and io_base_phys always represent IO + * space starting at 0 so we factor in pci_addr + */ + hose->pci_io_size = range.pci_addr + range.size; + hose->io_base_phys = range.cpu_addr - range.pci_addr; + + /* Build resource */ + res = &hose->io_resource; + range.cpu_addr = range.pci_addr; + break; + case IORESOURCE_MEM: + printk(KERN_INFO + " MEM 0x%016llx..0x%016llx -> 0x%016llx %s\n", + range.cpu_addr, range.cpu_addr + range.size - 1, + range.pci_addr, + (range.flags & IORESOURCE_PREFETCH) ? + "Prefetch" : ""); + + /* We support only 3 memory ranges */ + if (memno >= 3) { + printk(KERN_INFO + " \\--> Skipped (too many) !\n"); + continue; + } + /* Handles ISA memory hole space here */ + if (range.pci_addr == 0) { + if (primary || isa_mem_base == 0) + isa_mem_base = range.cpu_addr; + hose->isa_mem_phys = range.cpu_addr; + hose->isa_mem_size = range.size; + } + + /* Build resource */ + hose->mem_offset[memno] = range.cpu_addr - + range.pci_addr; + res = &hose->mem_resources[memno++]; + break; + } + if (res != NULL) { + res->name = dev->full_name; + res->flags = range.flags; + res->start = range.cpu_addr; + res->end = range.cpu_addr + range.size - 1; + res->parent = res->child = res->sibling = NULL; + } + } +} + +/* Decide whether to display the domain number in /proc */ +int pci_proc_domain(struct pci_bus *bus) +{ + struct pci_controller *hose = pci_bus_to_host(bus); + + if (!pci_has_flag(PCI_ENABLE_PROC_DOMAINS)) + return 0; + if (pci_has_flag(PCI_COMPAT_DOMAIN_0)) + return hose->global_number != 0; + return 1; +} + +int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) +{ + if (ppc_md.pcibios_root_bridge_prepare) + return ppc_md.pcibios_root_bridge_prepare(bridge); + + return 0; +} + +/* This header fixup will do the resource fixup for all devices as they are + * probed, but not for bridge ranges + */ +static void pcibios_fixup_resources(struct pci_dev *dev) +{ + struct pci_controller *hose = pci_bus_to_host(dev->bus); + int i; + + if (!hose) { + printk(KERN_ERR "No host bridge for PCI dev %s !\n", + pci_name(dev)); + return; + } + + if (dev->is_virtfn) + return; + + for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { + struct resource *res = dev->resource + i; + struct pci_bus_region reg; + if (!res->flags) + continue; + + /* If we're going to re-assign everything, we mark all resources + * as unset (and 0-base them). In addition, we mark BARs starting + * at 0 as unset as well, except if PCI_PROBE_ONLY is also set + * since in that case, we don't want to re-assign anything + */ + pcibios_resource_to_bus(dev->bus, ®, res); + if (pci_has_flag(PCI_REASSIGN_ALL_RSRC) || + (reg.start == 0 && !pci_has_flag(PCI_PROBE_ONLY))) { + /* Only print message if not re-assigning */ + if (!pci_has_flag(PCI_REASSIGN_ALL_RSRC)) + pr_debug("PCI:%s Resource %d %pR is unassigned\n", + pci_name(dev), i, res); + res->end -= res->start; + res->start = 0; + res->flags |= IORESOURCE_UNSET; + continue; + } + + pr_debug("PCI:%s Resource %d %pR\n", pci_name(dev), i, res); + } + + /* Call machine specific resource fixup */ + if (ppc_md.pcibios_fixup_resources) + ppc_md.pcibios_fixup_resources(dev); +} +DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources); + +/* This function tries to figure out if a bridge resource has been initialized + * by the firmware or not. It doesn't have to be absolutely bullet proof, but + * things go more smoothly when it gets it right. It should covers cases such + * as Apple "closed" bridge resources and bare-metal pSeries unassigned bridges + */ +static int pcibios_uninitialized_bridge_resource(struct pci_bus *bus, + struct resource *res) +{ + struct pci_controller *hose = pci_bus_to_host(bus); + struct pci_dev *dev = bus->self; + resource_size_t offset; + struct pci_bus_region region; + u16 command; + int i; + + /* We don't do anything if PCI_PROBE_ONLY is set */ + if (pci_has_flag(PCI_PROBE_ONLY)) + return 0; + + /* Job is a bit different between memory and IO */ + if (res->flags & IORESOURCE_MEM) { + pcibios_resource_to_bus(dev->bus, ®ion, res); + + /* If the BAR is non-0 then it's probably been initialized */ + if (region.start != 0) + return 0; + + /* The BAR is 0, let's check if memory decoding is enabled on + * the bridge. If not, we consider it unassigned + */ + pci_read_config_word(dev, PCI_COMMAND, &command); + if ((command & PCI_COMMAND_MEMORY) == 0) + return 1; + + /* Memory decoding is enabled and the BAR is 0. If any of the bridge + * resources covers that starting address (0 then it's good enough for + * us for memory space) + */ + for (i = 0; i < 3; i++) { + if ((hose->mem_resources[i].flags & IORESOURCE_MEM) && + hose->mem_resources[i].start == hose->mem_offset[i]) + return 0; + } + + /* Well, it starts at 0 and we know it will collide so we may as + * well consider it as unassigned. That covers the Apple case. + */ + return 1; + } else { + /* If the BAR is non-0, then we consider it assigned */ + offset = (unsigned long)hose->io_base_virt - _IO_BASE; + if (((res->start - offset) & 0xfffffffful) != 0) + return 0; + + /* Here, we are a bit different than memory as typically IO space + * starting at low addresses -is- valid. What we do instead if that + * we consider as unassigned anything that doesn't have IO enabled + * in the PCI command register, and that's it. + */ + pci_read_config_word(dev, PCI_COMMAND, &command); + if (command & PCI_COMMAND_IO) + return 0; + + /* It's starting at 0 and IO is disabled in the bridge, consider + * it unassigned + */ + return 1; + } +} + +/* Fixup resources of a PCI<->PCI bridge */ +static void pcibios_fixup_bridge(struct pci_bus *bus) +{ + struct resource *res; + int i; + + struct pci_dev *dev = bus->self; + + pci_bus_for_each_resource(bus, res, i) { + if (!res || !res->flags) + continue; + if (i >= 3 && bus->self->transparent) + continue; + + /* If we're going to reassign everything, we can + * shrink the P2P resource to have size as being + * of 0 in order to save space. + */ + if (pci_has_flag(PCI_REASSIGN_ALL_RSRC)) { + res->flags |= IORESOURCE_UNSET; + res->start = 0; + res->end = -1; + continue; + } + + pr_debug("PCI:%s Bus rsrc %d %pR\n", pci_name(dev), i, res); + + /* Try to detect uninitialized P2P bridge resources, + * and clear them out so they get re-assigned later + */ + if (pcibios_uninitialized_bridge_resource(bus, res)) { + res->flags = 0; + pr_debug("PCI:%s (unassigned)\n", pci_name(dev)); + } + } +} + +void pcibios_setup_bus_self(struct pci_bus *bus) +{ + struct pci_controller *phb; + + /* Fix up the bus resources for P2P bridges */ + if (bus->self != NULL) + pcibios_fixup_bridge(bus); + + /* Platform specific bus fixups. This is currently only used + * by fsl_pci and I'm hoping to get rid of it at some point + */ + if (ppc_md.pcibios_fixup_bus) + ppc_md.pcibios_fixup_bus(bus); + + /* Setup bus DMA mappings */ + phb = pci_bus_to_host(bus); + if (phb->controller_ops.dma_bus_setup) + phb->controller_ops.dma_bus_setup(bus); +} + +void pcibios_bus_add_device(struct pci_dev *dev) +{ + struct pci_controller *phb; + /* Fixup NUMA node as it may not be setup yet by the generic + * code and is needed by the DMA init + */ + set_dev_node(&dev->dev, pcibus_to_node(dev->bus)); + + /* Hook up default DMA ops */ + set_dma_ops(&dev->dev, pci_dma_ops); + dev->dev.archdata.dma_offset = PCI_DRAM_OFFSET; + + /* Additional platform DMA/iommu setup */ + phb = pci_bus_to_host(dev->bus); + if (phb->controller_ops.dma_dev_setup) + phb->controller_ops.dma_dev_setup(dev); + + /* Read default IRQs and fixup if necessary */ + pci_read_irq_line(dev); + if (ppc_md.pci_irq_fixup) + ppc_md.pci_irq_fixup(dev); + + if (ppc_md.pcibios_bus_add_device) + ppc_md.pcibios_bus_add_device(dev); +} + +int pcibios_device_add(struct pci_dev *dev) +{ + struct irq_domain *d; + +#ifdef CONFIG_PCI_IOV + if (ppc_md.pcibios_fixup_sriov) + ppc_md.pcibios_fixup_sriov(dev); +#endif /* CONFIG_PCI_IOV */ + + d = dev_get_msi_domain(&dev->bus->dev); + if (d) + dev_set_msi_domain(&dev->dev, d); + return 0; +} + +void pcibios_set_master(struct pci_dev *dev) +{ + /* No special bus mastering setup handling */ +} + +void pcibios_fixup_bus(struct pci_bus *bus) +{ + /* When called from the generic PCI probe, read PCI<->PCI bridge + * bases. This is -not- called when generating the PCI tree from + * the OF device-tree. + */ + pci_read_bridge_bases(bus); + + /* Now fixup the bus */ + pcibios_setup_bus_self(bus); +} +EXPORT_SYMBOL(pcibios_fixup_bus); + +static int skip_isa_ioresource_align(struct pci_dev *dev) +{ + if (pci_has_flag(PCI_CAN_SKIP_ISA_ALIGN) && + !(dev->bus->bridge_ctl & PCI_BRIDGE_CTL_ISA)) + return 1; + return 0; +} + +/* + * We need to avoid collisions with `mirrored' VGA ports + * and other strange ISA hardware, so we always want the + * addresses to be allocated in the 0x000-0x0ff region + * modulo 0x400. + * + * Why? Because some silly external IO cards only decode + * the low 10 bits of the IO address. The 0x00-0xff region + * is reserved for motherboard devices that decode all 16 + * bits, so it's ok to allocate at, say, 0x2800-0x28ff, + * but we want to try to avoid allocating at 0x2900-0x2bff + * which might have be mirrored at 0x0100-0x03ff.. + */ +resource_size_t pcibios_align_resource(void *data, const struct resource *res, + resource_size_t size, resource_size_t align) +{ + struct pci_dev *dev = data; + resource_size_t start = res->start; + + if (res->flags & IORESOURCE_IO) { + if (skip_isa_ioresource_align(dev)) + return start; + if (start & 0x300) + start = (start + 0x3ff) & ~0x3ff; + } + + return start; +} +EXPORT_SYMBOL(pcibios_align_resource); + +/* + * Reparent resource children of pr that conflict with res + * under res, and make res replace those children. + */ +static int reparent_resources(struct resource *parent, + struct resource *res) +{ + struct resource *p, **pp; + struct resource **firstpp = NULL; + + for (pp = &parent->child; (p = *pp) != NULL; pp = &p->sibling) { + if (p->end < res->start) + continue; + if (res->end < p->start) + break; + if (p->start < res->start || p->end > res->end) + return -1; /* not completely contained */ + if (firstpp == NULL) + firstpp = pp; + } + if (firstpp == NULL) + return -1; /* didn't find any conflicting entries? */ + res->parent = parent; + res->child = *firstpp; + res->sibling = *pp; + *firstpp = res; + *pp = NULL; + for (p = res->child; p != NULL; p = p->sibling) { + p->parent = res; + pr_debug("PCI: Reparented %s %pR under %s\n", + p->name, p, res->name); + } + return 0; +} + +/* + * Handle resources of PCI devices. If the world were perfect, we could + * just allocate all the resource regions and do nothing more. It isn't. + * On the other hand, we cannot just re-allocate all devices, as it would + * require us to know lots of host bridge internals. So we attempt to + * keep as much of the original configuration as possible, but tweak it + * when it's found to be wrong. + * + * Known BIOS problems we have to work around: + * - I/O or memory regions not configured + * - regions configured, but not enabled in the command register + * - bogus I/O addresses above 64K used + * - expansion ROMs left enabled (this may sound harmless, but given + * the fact the PCI specs explicitly allow address decoders to be + * shared between expansion ROMs and other resource regions, it's + * at least dangerous) + * + * Our solution: + * (1) Allocate resources for all buses behind PCI-to-PCI bridges. + * This gives us fixed barriers on where we can allocate. + * (2) Allocate resources for all enabled devices. If there is + * a collision, just mark the resource as unallocated. Also + * disable expansion ROMs during this step. + * (3) Try to allocate resources for disabled devices. If the + * resources were assigned correctly, everything goes well, + * if they weren't, they won't disturb allocation of other + * resources. + * (4) Assign new addresses to resources which were either + * not configured at all or misconfigured. If explicitly + * requested by the user, configure expansion ROM address + * as well. + */ + +static void pcibios_allocate_bus_resources(struct pci_bus *bus) +{ + struct pci_bus *b; + int i; + struct resource *res, *pr; + + pr_debug("PCI: Allocating bus resources for %04x:%02x...\n", + pci_domain_nr(bus), bus->number); + + pci_bus_for_each_resource(bus, res, i) { + if (!res || !res->flags || res->start > res->end || res->parent) + continue; + + /* If the resource was left unset at this point, we clear it */ + if (res->flags & IORESOURCE_UNSET) + goto clear_resource; + + if (bus->parent == NULL) + pr = (res->flags & IORESOURCE_IO) ? + &ioport_resource : &iomem_resource; + else { + pr = pci_find_parent_resource(bus->self, res); + if (pr == res) { + /* this happens when the generic PCI + * code (wrongly) decides that this + * bridge is transparent -- paulus + */ + continue; + } + } + + pr_debug("PCI: %s (bus %d) bridge rsrc %d: %pR, parent %p (%s)\n", + bus->self ? pci_name(bus->self) : "PHB", bus->number, + i, res, pr, (pr && pr->name) ? pr->name : "nil"); + + if (pr && !(pr->flags & IORESOURCE_UNSET)) { + struct pci_dev *dev = bus->self; + + if (request_resource(pr, res) == 0) + continue; + /* + * Must be a conflict with an existing entry. + * Move that entry (or entries) under the + * bridge resource and try again. + */ + if (reparent_resources(pr, res) == 0) + continue; + + if (dev && i < PCI_BRIDGE_RESOURCE_NUM && + pci_claim_bridge_resource(dev, + i + PCI_BRIDGE_RESOURCES) == 0) + continue; + } + pr_warn("PCI: Cannot allocate resource region %d of PCI bridge %d, will remap\n", + i, bus->number); + clear_resource: + /* The resource might be figured out when doing + * reassignment based on the resources required + * by the downstream PCI devices. Here we set + * the size of the resource to be 0 in order to + * save more space. + */ + res->start = 0; + res->end = -1; + res->flags = 0; + } + + list_for_each_entry(b, &bus->children, node) + pcibios_allocate_bus_resources(b); +} + +static inline void alloc_resource(struct pci_dev *dev, int idx) +{ + struct resource *pr, *r = &dev->resource[idx]; + + pr_debug("PCI: Allocating %s: Resource %d: %pR\n", + pci_name(dev), idx, r); + + pr = pci_find_parent_resource(dev, r); + if (!pr || (pr->flags & IORESOURCE_UNSET) || + request_resource(pr, r) < 0) { + printk(KERN_WARNING "PCI: Cannot allocate resource region %d" + " of device %s, will remap\n", idx, pci_name(dev)); + if (pr) + pr_debug("PCI: parent is %p: %pR\n", pr, pr); + /* We'll assign a new address later */ + r->flags |= IORESOURCE_UNSET; + r->end -= r->start; + r->start = 0; + } +} + +static void __init pcibios_allocate_resources(int pass) +{ + struct pci_dev *dev = NULL; + int idx, disabled; + u16 command; + struct resource *r; + + for_each_pci_dev(dev) { + pci_read_config_word(dev, PCI_COMMAND, &command); + for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) { + r = &dev->resource[idx]; + if (r->parent) /* Already allocated */ + continue; + if (!r->flags || (r->flags & IORESOURCE_UNSET)) + continue; /* Not assigned at all */ + /* We only allocate ROMs on pass 1 just in case they + * have been screwed up by firmware + */ + if (idx == PCI_ROM_RESOURCE ) + disabled = 1; + if (r->flags & IORESOURCE_IO) + disabled = !(command & PCI_COMMAND_IO); + else + disabled = !(command & PCI_COMMAND_MEMORY); + if (pass == disabled) + alloc_resource(dev, idx); + } + if (pass) + continue; + r = &dev->resource[PCI_ROM_RESOURCE]; + if (r->flags) { + /* Turn the ROM off, leave the resource region, + * but keep it unregistered. + */ + u32 reg; + pci_read_config_dword(dev, dev->rom_base_reg, ®); + if (reg & PCI_ROM_ADDRESS_ENABLE) { + pr_debug("PCI: Switching off ROM of %s\n", + pci_name(dev)); + r->flags &= ~IORESOURCE_ROM_ENABLE; + pci_write_config_dword(dev, dev->rom_base_reg, + reg & ~PCI_ROM_ADDRESS_ENABLE); + } + } + } +} + +static void __init pcibios_reserve_legacy_regions(struct pci_bus *bus) +{ + struct pci_controller *hose = pci_bus_to_host(bus); + resource_size_t offset; + struct resource *res, *pres; + int i; + + pr_debug("Reserving legacy ranges for domain %04x\n", pci_domain_nr(bus)); + + /* Check for IO */ + if (!(hose->io_resource.flags & IORESOURCE_IO)) + goto no_io; + offset = (unsigned long)hose->io_base_virt - _IO_BASE; + res = kzalloc(sizeof(struct resource), GFP_KERNEL); + BUG_ON(res == NULL); + res->name = "Legacy IO"; + res->flags = IORESOURCE_IO; + res->start = offset; + res->end = (offset + 0xfff) & 0xfffffffful; + pr_debug("Candidate legacy IO: %pR\n", res); + if (request_resource(&hose->io_resource, res)) { + printk(KERN_DEBUG + "PCI %04x:%02x Cannot reserve Legacy IO %pR\n", + pci_domain_nr(bus), bus->number, res); + kfree(res); + } + + no_io: + /* Check for memory */ + for (i = 0; i < 3; i++) { + pres = &hose->mem_resources[i]; + offset = hose->mem_offset[i]; + if (!(pres->flags & IORESOURCE_MEM)) + continue; + pr_debug("hose mem res: %pR\n", pres); + if ((pres->start - offset) <= 0xa0000 && + (pres->end - offset) >= 0xbffff) + break; + } + if (i >= 3) + return; + res = kzalloc(sizeof(struct resource), GFP_KERNEL); + BUG_ON(res == NULL); + res->name = "Legacy VGA memory"; + res->flags = IORESOURCE_MEM; + res->start = 0xa0000 + offset; + res->end = 0xbffff + offset; + pr_debug("Candidate VGA memory: %pR\n", res); + if (request_resource(pres, res)) { + printk(KERN_DEBUG + "PCI %04x:%02x Cannot reserve VGA memory %pR\n", + pci_domain_nr(bus), bus->number, res); + kfree(res); + } +} + +void __init pcibios_resource_survey(void) +{ + struct pci_bus *b; + + /* Allocate and assign resources */ + list_for_each_entry(b, &pci_root_buses, node) + pcibios_allocate_bus_resources(b); + if (!pci_has_flag(PCI_REASSIGN_ALL_RSRC)) { + pcibios_allocate_resources(0); + pcibios_allocate_resources(1); + } + + /* Before we start assigning unassigned resource, we try to reserve + * the low IO area and the VGA memory area if they intersect the + * bus available resources to avoid allocating things on top of them + */ + if (!pci_has_flag(PCI_PROBE_ONLY)) { + list_for_each_entry(b, &pci_root_buses, node) + pcibios_reserve_legacy_regions(b); + } + + /* Now, if the platform didn't decide to blindly trust the firmware, + * we proceed to assigning things that were left unassigned + */ + if (!pci_has_flag(PCI_PROBE_ONLY)) { + pr_debug("PCI: Assigning unassigned resources...\n"); + pci_assign_unassigned_resources(); + } +} + +/* This is used by the PCI hotplug driver to allocate resource + * of newly plugged busses. We can try to consolidate with the + * rest of the code later, for now, keep it as-is as our main + * resource allocation function doesn't deal with sub-trees yet. + */ +void pcibios_claim_one_bus(struct pci_bus *bus) +{ + struct pci_dev *dev; + struct pci_bus *child_bus; + + list_for_each_entry(dev, &bus->devices, bus_list) { + int i; + + for (i = 0; i < PCI_NUM_RESOURCES; i++) { + struct resource *r = &dev->resource[i]; + + if (r->parent || !r->start || !r->flags) + continue; + + pr_debug("PCI: Claiming %s: Resource %d: %pR\n", + pci_name(dev), i, r); + + if (pci_claim_resource(dev, i) == 0) + continue; + + pci_claim_bridge_resource(dev, i); + } + } + + list_for_each_entry(child_bus, &bus->children, node) + pcibios_claim_one_bus(child_bus); +} +EXPORT_SYMBOL_GPL(pcibios_claim_one_bus); + + +/* pcibios_finish_adding_to_bus + * + * This is to be called by the hotplug code after devices have been + * added to a bus, this include calling it for a PHB that is just + * being added + */ +void pcibios_finish_adding_to_bus(struct pci_bus *bus) +{ + pr_debug("PCI: Finishing adding to hotplug bus %04x:%02x\n", + pci_domain_nr(bus), bus->number); + + /* Allocate bus and devices resources */ + pcibios_allocate_bus_resources(bus); + pcibios_claim_one_bus(bus); + if (!pci_has_flag(PCI_PROBE_ONLY)) { + if (bus->self) + pci_assign_unassigned_bridge_resources(bus->self); + else + pci_assign_unassigned_bus_resources(bus); + } + + /* Add new devices to global lists. Register in proc, sysfs. */ + pci_bus_add_devices(bus); +} +EXPORT_SYMBOL_GPL(pcibios_finish_adding_to_bus); + +int pcibios_enable_device(struct pci_dev *dev, int mask) +{ + struct pci_controller *phb = pci_bus_to_host(dev->bus); + + if (phb->controller_ops.enable_device_hook) + if (!phb->controller_ops.enable_device_hook(dev)) + return -EINVAL; + + return pci_enable_resources(dev, mask); +} + +void pcibios_disable_device(struct pci_dev *dev) +{ + struct pci_controller *phb = pci_bus_to_host(dev->bus); + + if (phb->controller_ops.disable_device) + phb->controller_ops.disable_device(dev); +} + +resource_size_t pcibios_io_space_offset(struct pci_controller *hose) +{ + return (unsigned long) hose->io_base_virt - _IO_BASE; +} + +static void pcibios_setup_phb_resources(struct pci_controller *hose, + struct list_head *resources) +{ + struct resource *res; + resource_size_t offset; + int i; + + /* Hookup PHB IO resource */ + res = &hose->io_resource; + + if (!res->flags) { + pr_debug("PCI: I/O resource not set for host" + " bridge %pOF (domain %d)\n", + hose->dn, hose->global_number); + } else { + offset = pcibios_io_space_offset(hose); + + pr_debug("PCI: PHB IO resource = %pR off 0x%08llx\n", + res, (unsigned long long)offset); + pci_add_resource_offset(resources, res, offset); + } + + /* Hookup PHB Memory resources */ + for (i = 0; i < 3; ++i) { + res = &hose->mem_resources[i]; + if (!res->flags) + continue; + + offset = hose->mem_offset[i]; + pr_debug("PCI: PHB MEM resource %d = %pR off 0x%08llx\n", i, + res, (unsigned long long)offset); + + pci_add_resource_offset(resources, res, offset); + } +} + +/* + * Null PCI config access functions, for the case when we can't + * find a hose. + */ +#define NULL_PCI_OP(rw, size, type) \ +static int \ +null_##rw##_config_##size(struct pci_dev *dev, int offset, type val) \ +{ \ + return PCIBIOS_DEVICE_NOT_FOUND; \ +} + +static int +null_read_config(struct pci_bus *bus, unsigned int devfn, int offset, + int len, u32 *val) +{ + return PCIBIOS_DEVICE_NOT_FOUND; +} + +static int +null_write_config(struct pci_bus *bus, unsigned int devfn, int offset, + int len, u32 val) +{ + return PCIBIOS_DEVICE_NOT_FOUND; +} + +static struct pci_ops null_pci_ops = +{ + .read = null_read_config, + .write = null_write_config, +}; + +/* + * These functions are used early on before PCI scanning is done + * and all of the pci_dev and pci_bus structures have been created. + */ +static struct pci_bus * +fake_pci_bus(struct pci_controller *hose, int busnr) +{ + static struct pci_bus bus; + + if (hose == NULL) { + printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr); + } + bus.number = busnr; + bus.sysdata = hose; + bus.ops = hose? hose->ops: &null_pci_ops; + return &bus; +} + +#define EARLY_PCI_OP(rw, size, type) \ +int early_##rw##_config_##size(struct pci_controller *hose, int bus, \ + int devfn, int offset, type value) \ +{ \ + return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus), \ + devfn, offset, value); \ +} + +EARLY_PCI_OP(read, byte, u8 *) +EARLY_PCI_OP(read, word, u16 *) +EARLY_PCI_OP(read, dword, u32 *) +EARLY_PCI_OP(write, byte, u8) +EARLY_PCI_OP(write, word, u16) +EARLY_PCI_OP(write, dword, u32) + +int early_find_capability(struct pci_controller *hose, int bus, int devfn, + int cap) +{ + return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap); +} + +struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus) +{ + struct pci_controller *hose = bus->sysdata; + + return of_node_get(hose->dn); +} + +/** + * pci_scan_phb - Given a pci_controller, setup and scan the PCI bus + * @hose: Pointer to the PCI host controller instance structure + */ +void pcibios_scan_phb(struct pci_controller *hose) +{ + LIST_HEAD(resources); + struct pci_bus *bus; + struct device_node *node = hose->dn; + int mode; + + pr_debug("PCI: Scanning PHB %pOF\n", node); + + /* Get some IO space for the new PHB */ + pcibios_setup_phb_io_space(hose); + + /* Wire up PHB bus resources */ + pcibios_setup_phb_resources(hose, &resources); + + hose->busn.start = hose->first_busno; + hose->busn.end = hose->last_busno; + hose->busn.flags = IORESOURCE_BUS; + pci_add_resource(&resources, &hose->busn); + + /* Create an empty bus for the toplevel */ + bus = pci_create_root_bus(hose->parent, hose->first_busno, + hose->ops, hose, &resources); + if (bus == NULL) { + pr_err("Failed to create bus for PCI domain %04x\n", + hose->global_number); + pci_free_resource_list(&resources); + return; + } + hose->bus = bus; + + /* Get probe mode and perform scan */ + mode = PCI_PROBE_NORMAL; + if (node && hose->controller_ops.probe_mode) + mode = hose->controller_ops.probe_mode(bus); + pr_debug(" probe mode: %d\n", mode); + if (mode == PCI_PROBE_DEVTREE) + of_scan_bus(node, bus); + + if (mode == PCI_PROBE_NORMAL) { + pci_bus_update_busn_res_end(bus, 255); + hose->last_busno = pci_scan_child_bus(bus); + pci_bus_update_busn_res_end(bus, hose->last_busno); + } + + /* Platform gets a chance to do some global fixups before + * we proceed to resource allocation + */ + if (ppc_md.pcibios_fixup_phb) + ppc_md.pcibios_fixup_phb(hose); + + /* Configure PCI Express settings */ + if (bus && !pci_has_flag(PCI_PROBE_ONLY)) { + struct pci_bus *child; + list_for_each_entry(child, &bus->children, node) + pcie_bus_configure_settings(child); + } +} +EXPORT_SYMBOL_GPL(pcibios_scan_phb); + +static void fixup_hide_host_resource_fsl(struct pci_dev *dev) +{ + int i, class = dev->class >> 8; + /* When configured as agent, programming interface = 1 */ + int prog_if = dev->class & 0xf; + + if ((class == PCI_CLASS_PROCESSOR_POWERPC || + class == PCI_CLASS_BRIDGE_OTHER) && + (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) && + (prog_if == 0) && + (dev->bus->parent == NULL)) { + for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { + dev->resource[i].start = 0; + dev->resource[i].end = 0; + dev->resource[i].flags = 0; + } + } +} +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl); +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl); + + +static int __init discover_phbs(void) +{ + if (ppc_md.discover_phbs) + ppc_md.discover_phbs(); + + return 0; +} +core_initcall(discover_phbs); diff --git a/arch/powerpc/kernel/pci-hotplug.c b/arch/powerpc/kernel/pci-hotplug.c new file mode 100644 index 000000000..0fe251c6a --- /dev/null +++ b/arch/powerpc/kernel/pci-hotplug.c @@ -0,0 +1,149 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Derived from "arch/powerpc/platforms/pseries/pci_dlpar.c" + * + * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com> + * Copyright (C) 2005 International Business Machines + * + * Updates, 2005, John Rose <johnrose@austin.ibm.com> + * Updates, 2005, Linas Vepstas <linas@austin.ibm.com> + * Updates, 2013, Gavin Shan <shangw@linux.vnet.ibm.com> + */ + +#include <linux/pci.h> +#include <linux/export.h> +#include <linux/of.h> +#include <asm/pci-bridge.h> +#include <asm/ppc-pci.h> +#include <asm/firmware.h> +#include <asm/eeh.h> + +static struct pci_bus *find_bus_among_children(struct pci_bus *bus, + struct device_node *dn) +{ + struct pci_bus *child = NULL; + struct pci_bus *tmp; + + if (pci_bus_to_OF_node(bus) == dn) + return bus; + + list_for_each_entry(tmp, &bus->children, node) { + child = find_bus_among_children(tmp, dn); + if (child) + break; + } + + return child; +} + +struct pci_bus *pci_find_bus_by_node(struct device_node *dn) +{ + struct pci_dn *pdn = PCI_DN(dn); + + if (!pdn || !pdn->phb || !pdn->phb->bus) + return NULL; + + return find_bus_among_children(pdn->phb->bus, dn); +} +EXPORT_SYMBOL_GPL(pci_find_bus_by_node); + +/** + * pcibios_release_device - release PCI device + * @dev: PCI device + * + * The function is called before releasing the indicated PCI device. + */ +void pcibios_release_device(struct pci_dev *dev) +{ + struct pci_controller *phb = pci_bus_to_host(dev->bus); + struct pci_dn *pdn = pci_get_pdn(dev); + + if (phb->controller_ops.release_device) + phb->controller_ops.release_device(dev); + + /* free()ing the pci_dn has been deferred to us, do it now */ + if (pdn && (pdn->flags & PCI_DN_FLAG_DEAD)) { + pci_dbg(dev, "freeing dead pdn\n"); + kfree(pdn); + } +} + +/** + * pci_hp_remove_devices - remove all devices under this bus + * @bus: the indicated PCI bus + * + * Remove all of the PCI devices under this bus both from the + * linux pci device tree, and from the powerpc EEH address cache. + */ +void pci_hp_remove_devices(struct pci_bus *bus) +{ + struct pci_dev *dev, *tmp; + struct pci_bus *child_bus; + + /* First go down child busses */ + list_for_each_entry(child_bus, &bus->children, node) + pci_hp_remove_devices(child_bus); + + pr_debug("PCI: Removing devices on bus %04x:%02x\n", + pci_domain_nr(bus), bus->number); + list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) { + pr_debug(" Removing %s...\n", pci_name(dev)); + pci_stop_and_remove_bus_device(dev); + } +} +EXPORT_SYMBOL_GPL(pci_hp_remove_devices); + +/** + * pci_hp_add_devices - adds new pci devices to bus + * @bus: the indicated PCI bus + * + * This routine will find and fixup new pci devices under + * the indicated bus. This routine presumes that there + * might already be some devices under this bridge, so + * it carefully tries to add only new devices. (And that + * is how this routine differs from other, similar pcibios + * routines.) + */ +void pci_hp_add_devices(struct pci_bus *bus) +{ + int slotno, mode, max; + struct pci_dev *dev; + struct pci_controller *phb; + struct device_node *dn = pci_bus_to_OF_node(bus); + + phb = pci_bus_to_host(bus); + + mode = PCI_PROBE_NORMAL; + if (phb->controller_ops.probe_mode) + mode = phb->controller_ops.probe_mode(bus); + + if (mode == PCI_PROBE_DEVTREE) { + /* use ofdt-based probe */ + of_rescan_bus(dn, bus); + } else if (mode == PCI_PROBE_NORMAL && + dn->child && PCI_DN(dn->child)) { + /* + * Use legacy probe. In the partial hotplug case, we + * probably have grandchildren devices unplugged. So + * we don't check the return value from pci_scan_slot() in + * order for fully rescan all the way down to pick them up. + * They can have been removed during partial hotplug. + */ + slotno = PCI_SLOT(PCI_DN(dn->child)->devfn); + pci_scan_slot(bus, PCI_DEVFN(slotno, 0)); + max = bus->busn_res.start; + /* + * Scan bridges that are already configured. We don't touch + * them unless they are misconfigured (which will be done in + * the second scan below). + */ + for_each_pci_bridge(dev, bus) + max = pci_scan_bridge(bus, dev, max, 0); + + /* Scan bridges that need to be reconfigured */ + for_each_pci_bridge(dev, bus) + max = pci_scan_bridge(bus, dev, max, 1); + } + pcibios_finish_adding_to_bus(bus); +} +EXPORT_SYMBOL_GPL(pci_hp_add_devices); diff --git a/arch/powerpc/kernel/pci_32.c b/arch/powerpc/kernel/pci_32.c new file mode 100644 index 000000000..855b59892 --- /dev/null +++ b/arch/powerpc/kernel/pci_32.c @@ -0,0 +1,343 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Common pmac/prep/chrp pci routines. -- Cort + */ + +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/delay.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/capability.h> +#include <linux/sched.h> +#include <linux/errno.h> +#include <linux/memblock.h> +#include <linux/syscalls.h> +#include <linux/irq.h> +#include <linux/list.h> +#include <linux/of.h> +#include <linux/slab.h> +#include <linux/export.h> + +#include <asm/processor.h> +#include <asm/io.h> +#include <asm/sections.h> +#include <asm/pci-bridge.h> +#include <asm/ppc-pci.h> +#include <asm/byteorder.h> +#include <linux/uaccess.h> +#include <asm/machdep.h> + +#undef DEBUG + +unsigned long isa_io_base = 0; +unsigned long pci_dram_offset = 0; +int pcibios_assign_bus_offset = 1; +EXPORT_SYMBOL(isa_io_base); +EXPORT_SYMBOL(pci_dram_offset); + +static void fixup_cpc710_pci64(struct pci_dev* dev); + +/* By default, we don't re-assign bus numbers. We do this only on + * some pmacs + */ +static int pci_assign_all_buses; + +/* This will remain NULL for now, until isa-bridge.c is made common + * to both 32-bit and 64-bit. + */ +struct pci_dev *isa_bridge_pcidev; +EXPORT_SYMBOL_GPL(isa_bridge_pcidev); + +static void +fixup_cpc710_pci64(struct pci_dev* dev) +{ + /* Hide the PCI64 BARs from the kernel as their content doesn't + * fit well in the resource management + */ + dev->resource[0].start = dev->resource[0].end = 0; + dev->resource[0].flags = 0; + dev->resource[1].start = dev->resource[1].end = 0; + dev->resource[1].flags = 0; +} +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64); + +#if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP) + +static u8* pci_to_OF_bus_map; +static int pci_bus_count; + +/* + * Functions below are used on OpenFirmware machines. + */ +static void +make_one_node_map(struct device_node* node, u8 pci_bus) +{ + const int *bus_range; + int len; + + if (pci_bus >= pci_bus_count) + return; + bus_range = of_get_property(node, "bus-range", &len); + if (bus_range == NULL || len < 2 * sizeof(int)) { + printk(KERN_WARNING "Can't get bus-range for %pOF, " + "assuming it starts at 0\n", node); + pci_to_OF_bus_map[pci_bus] = 0; + } else + pci_to_OF_bus_map[pci_bus] = bus_range[0]; + + for_each_child_of_node(node, node) { + struct pci_dev* dev; + const unsigned int *class_code, *reg; + + class_code = of_get_property(node, "class-code", NULL); + if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && + (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) + continue; + reg = of_get_property(node, "reg", NULL); + if (!reg) + continue; + dev = pci_get_domain_bus_and_slot(0, pci_bus, + ((reg[0] >> 8) & 0xff)); + if (!dev || !dev->subordinate) { + pci_dev_put(dev); + continue; + } + make_one_node_map(node, dev->subordinate->number); + pci_dev_put(dev); + } +} + +static void __init +pcibios_make_OF_bus_map(void) +{ + int i; + struct pci_controller *hose, *tmp; + struct property *map_prop; + struct device_node *dn; + + pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL); + if (!pci_to_OF_bus_map) { + printk(KERN_ERR "Can't allocate OF bus map !\n"); + return; + } + + /* We fill the bus map with invalid values, that helps + * debugging. + */ + for (i=0; i<pci_bus_count; i++) + pci_to_OF_bus_map[i] = 0xff; + + /* For each hose, we begin searching bridges */ + list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { + struct device_node* node = hose->dn; + + if (!node) + continue; + make_one_node_map(node, hose->first_busno); + } + dn = of_find_node_by_path("/"); + map_prop = of_find_property(dn, "pci-OF-bus-map", NULL); + if (map_prop) { + BUG_ON(pci_bus_count > map_prop->length); + memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count); + } + of_node_put(dn); +#ifdef DEBUG + printk("PCI->OF bus map:\n"); + for (i=0; i<pci_bus_count; i++) { + if (pci_to_OF_bus_map[i] == 0xff) + continue; + printk("%d -> %d\n", i, pci_to_OF_bus_map[i]); + } +#endif +} + + +#ifdef CONFIG_PPC_PMAC +/* + * Returns the PCI device matching a given OF node + */ +int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn) +{ + struct pci_dev *dev = NULL; + const __be32 *reg; + int size; + + /* Check if it might have a chance to be a PCI device */ + if (!pci_find_hose_for_OF_device(node)) + return -ENODEV; + + reg = of_get_property(node, "reg", &size); + if (!reg || size < 5 * sizeof(u32)) + return -ENODEV; + + *bus = (be32_to_cpup(®[0]) >> 16) & 0xff; + *devfn = (be32_to_cpup(®[0]) >> 8) & 0xff; + + /* Ok, here we need some tweak. If we have already renumbered + * all busses, we can't rely on the OF bus number any more. + * the pci_to_OF_bus_map is not enough as several PCI busses + * may match the same OF bus number. + */ + if (!pci_to_OF_bus_map) + return 0; + + for_each_pci_dev(dev) + if (pci_to_OF_bus_map[dev->bus->number] == *bus && + dev->devfn == *devfn) { + *bus = dev->bus->number; + pci_dev_put(dev); + return 0; + } + + return -ENODEV; +} +EXPORT_SYMBOL(pci_device_from_OF_node); +#endif + +#ifdef CONFIG_PPC_CHRP +/* We create the "pci-OF-bus-map" property now so it appears in the + * /proc device tree + */ +void __init +pci_create_OF_bus_map(void) +{ + struct property* of_prop; + struct device_node *dn; + + of_prop = memblock_alloc(sizeof(struct property) + 256, + SMP_CACHE_BYTES); + if (!of_prop) + panic("%s: Failed to allocate %zu bytes\n", __func__, + sizeof(struct property) + 256); + dn = of_find_node_by_path("/"); + if (dn) { + memset(of_prop, -1, sizeof(struct property) + 256); + of_prop->name = "pci-OF-bus-map"; + of_prop->length = 256; + of_prop->value = &of_prop[1]; + of_add_property(dn, of_prop); + of_node_put(dn); + } +} +#endif + +#endif /* defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP) */ + +void pcibios_setup_phb_io_space(struct pci_controller *hose) +{ + unsigned long io_offset; + struct resource *res = &hose->io_resource; + + /* Fixup IO space offset */ + io_offset = pcibios_io_space_offset(hose); + res->start += io_offset; + res->end += io_offset; +} + +static int __init pcibios_init(void) +{ + struct pci_controller *hose, *tmp; +#ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT + int next_busno = 0; +#endif + + printk(KERN_INFO "PCI: Probing PCI hardware\n"); + +#ifdef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT + /* + * Enable PCI domains in /proc when PCI bus numbers are not unique + * across all PCI domains to prevent conflicts. And keep PCI domain 0 + * backward compatible in /proc for video cards. + */ + pci_add_flags(PCI_ENABLE_PROC_DOMAINS | PCI_COMPAT_DOMAIN_0); +#endif + + if (pci_has_flag(PCI_REASSIGN_ALL_BUS)) + pci_assign_all_buses = 1; + + /* Scan all of the recorded PCI controllers. */ + list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { +#ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT + if (pci_assign_all_buses) + hose->first_busno = next_busno; +#endif + hose->last_busno = 0xff; + pcibios_scan_phb(hose); + pci_bus_add_devices(hose->bus); +#ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT + if (pci_assign_all_buses || next_busno <= hose->last_busno) + next_busno = hose->last_busno + pcibios_assign_bus_offset; +#endif + } + +#if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP) + pci_bus_count = next_busno; + + /* OpenFirmware based machines need a map of OF bus + * numbers vs. kernel bus numbers since we may have to + * remap them. + */ + if (pci_assign_all_buses) + pcibios_make_OF_bus_map(); +#endif + + /* Call common code to handle resource allocation */ + pcibios_resource_survey(); + + /* Call machine dependent fixup */ + if (ppc_md.pcibios_fixup) + ppc_md.pcibios_fixup(); + + /* Call machine dependent post-init code */ + if (ppc_md.pcibios_after_init) + ppc_md.pcibios_after_init(); + + return 0; +} + +subsys_initcall(pcibios_init); + +static struct pci_controller* +pci_bus_to_hose(int bus) +{ + struct pci_controller *hose, *tmp; + + list_for_each_entry_safe(hose, tmp, &hose_list, list_node) + if (bus >= hose->first_busno && bus <= hose->last_busno) + return hose; + return NULL; +} + +/* Provide information on locations of various I/O regions in physical + * memory. Do this on a per-card basis so that we choose the right + * root bridge. + * Note that the returned IO or memory base is a physical address + */ + +SYSCALL_DEFINE3(pciconfig_iobase, long, which, + unsigned long, bus, unsigned long, devfn) +{ + struct pci_controller* hose; + long result = -EOPNOTSUPP; + + hose = pci_bus_to_hose(bus); + if (!hose) + return -ENODEV; + + switch (which) { + case IOBASE_BRIDGE_NUMBER: + return (long)hose->first_busno; + case IOBASE_MEMORY: + return (long)hose->mem_offset[0]; + case IOBASE_IO: + return (long)hose->io_base_phys; + case IOBASE_ISA_IO: + return (long)isa_io_base; + case IOBASE_ISA_MEM: + return (long)isa_mem_base; + } + + return result; +} diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c new file mode 100644 index 000000000..0c7cfb9fa --- /dev/null +++ b/arch/powerpc/kernel/pci_64.c @@ -0,0 +1,298 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Port for PPC64 David Engebretsen, IBM Corp. + * Contains common pci routines for ppc64 platform, pSeries and iSeries brands. + * + * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM + * Rework, based on alpha PCI code. + */ + +#undef DEBUG + +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/export.h> +#include <linux/mm.h> +#include <linux/list.h> +#include <linux/syscalls.h> +#include <linux/irq.h> +#include <linux/vmalloc.h> +#include <linux/of.h> + +#include <asm/processor.h> +#include <asm/io.h> +#include <asm/pci-bridge.h> +#include <asm/byteorder.h> +#include <asm/machdep.h> +#include <asm/ppc-pci.h> + +/* pci_io_base -- the base address from which io bars are offsets. + * This is the lowest I/O base address (so bar values are always positive), + * and it *must* be the start of ISA space if an ISA bus exists because + * ISA drivers use hard coded offsets. If no ISA bus exists nothing + * is mapped on the first 64K of IO space + */ +unsigned long pci_io_base; +EXPORT_SYMBOL(pci_io_base); + +static int __init pcibios_init(void) +{ + struct pci_controller *hose, *tmp; + + printk(KERN_INFO "PCI: Probing PCI hardware\n"); + + /* For now, override phys_mem_access_prot. If we need it,g + * later, we may move that initialization to each ppc_md + */ + ppc_md.phys_mem_access_prot = pci_phys_mem_access_prot; + + /* On ppc64, we always enable PCI domains and we keep domain 0 + * backward compatible in /proc for video cards + */ + pci_add_flags(PCI_ENABLE_PROC_DOMAINS | PCI_COMPAT_DOMAIN_0); + + /* Scan all of the recorded PCI controllers. */ + list_for_each_entry_safe(hose, tmp, &hose_list, list_node) + pcibios_scan_phb(hose); + + /* Call common code to handle resource allocation */ + pcibios_resource_survey(); + + /* Add devices. */ + list_for_each_entry_safe(hose, tmp, &hose_list, list_node) + pci_bus_add_devices(hose->bus); + + /* Call machine dependent fixup */ + if (ppc_md.pcibios_fixup) + ppc_md.pcibios_fixup(); + + printk(KERN_DEBUG "PCI: Probing PCI hardware done\n"); + + return 0; +} + +subsys_initcall(pcibios_init); + +int pcibios_unmap_io_space(struct pci_bus *bus) +{ + struct pci_controller *hose; + + WARN_ON(bus == NULL); + + /* If this is not a PHB, we only flush the hash table over + * the area mapped by this bridge. We don't play with the PTE + * mappings since we might have to deal with sub-page alignments + * so flushing the hash table is the only sane way to make sure + * that no hash entries are covering that removed bridge area + * while still allowing other busses overlapping those pages + * + * Note: If we ever support P2P hotplug on Book3E, we'll have + * to do an appropriate TLB flush here too + */ + if (bus->self) { +#ifdef CONFIG_PPC_BOOK3S_64 + struct resource *res = bus->resource[0]; +#endif + + pr_debug("IO unmapping for PCI-PCI bridge %s\n", + pci_name(bus->self)); + +#ifdef CONFIG_PPC_BOOK3S_64 + __flush_hash_table_range(res->start + _IO_BASE, + res->end + _IO_BASE + 1); +#endif + return 0; + } + + /* Get the host bridge */ + hose = pci_bus_to_host(bus); + + pr_debug("IO unmapping for PHB %pOF\n", hose->dn); + pr_debug(" alloc=0x%p\n", hose->io_base_alloc); + + iounmap(hose->io_base_alloc); + return 0; +} +EXPORT_SYMBOL_GPL(pcibios_unmap_io_space); + +void __iomem *ioremap_phb(phys_addr_t paddr, unsigned long size) +{ + struct vm_struct *area; + unsigned long addr; + + WARN_ON_ONCE(paddr & ~PAGE_MASK); + WARN_ON_ONCE(size & ~PAGE_MASK); + + /* + * Let's allocate some IO space for that guy. We don't pass VM_IOREMAP + * because we don't care about alignment tricks that the core does in + * that case. Maybe we should due to stupid card with incomplete + * address decoding but I'd rather not deal with those outside of the + * reserved 64K legacy region. + */ + area = __get_vm_area_caller(size, 0, PHB_IO_BASE, PHB_IO_END, + __builtin_return_address(0)); + if (!area) + return NULL; + + addr = (unsigned long)area->addr; + if (ioremap_page_range(addr, addr + size, paddr, + pgprot_noncached(PAGE_KERNEL))) { + vunmap_range(addr, addr + size); + return NULL; + } + + return (void __iomem *)addr; +} +EXPORT_SYMBOL_GPL(ioremap_phb); + +static int pcibios_map_phb_io_space(struct pci_controller *hose) +{ + unsigned long phys_page; + unsigned long size_page; + unsigned long io_virt_offset; + + phys_page = ALIGN_DOWN(hose->io_base_phys, PAGE_SIZE); + size_page = ALIGN(hose->pci_io_size, PAGE_SIZE); + + /* Make sure IO area address is clear */ + hose->io_base_alloc = NULL; + + /* If there's no IO to map on that bus, get away too */ + if (hose->pci_io_size == 0 || hose->io_base_phys == 0) + return 0; + + /* Let's allocate some IO space for that guy. We don't pass + * VM_IOREMAP because we don't care about alignment tricks that + * the core does in that case. Maybe we should due to stupid card + * with incomplete address decoding but I'd rather not deal with + * those outside of the reserved 64K legacy region. + */ + hose->io_base_alloc = ioremap_phb(phys_page, size_page); + if (!hose->io_base_alloc) + return -ENOMEM; + hose->io_base_virt = hose->io_base_alloc + + hose->io_base_phys - phys_page; + + pr_debug("IO mapping for PHB %pOF\n", hose->dn); + pr_debug(" phys=0x%016llx, virt=0x%p (alloc=0x%p)\n", + hose->io_base_phys, hose->io_base_virt, hose->io_base_alloc); + pr_debug(" size=0x%016llx (alloc=0x%016lx)\n", + hose->pci_io_size, size_page); + + /* Fixup hose IO resource */ + io_virt_offset = pcibios_io_space_offset(hose); + hose->io_resource.start += io_virt_offset; + hose->io_resource.end += io_virt_offset; + + pr_debug(" hose->io_resource=%pR\n", &hose->io_resource); + + return 0; +} + +int pcibios_map_io_space(struct pci_bus *bus) +{ + WARN_ON(bus == NULL); + + /* If this not a PHB, nothing to do, page tables still exist and + * thus HPTEs will be faulted in when needed + */ + if (bus->self) { + pr_debug("IO mapping for PCI-PCI bridge %s\n", + pci_name(bus->self)); + pr_debug(" virt=0x%016llx...0x%016llx\n", + bus->resource[0]->start + _IO_BASE, + bus->resource[0]->end + _IO_BASE); + return 0; + } + + return pcibios_map_phb_io_space(pci_bus_to_host(bus)); +} +EXPORT_SYMBOL_GPL(pcibios_map_io_space); + +void pcibios_setup_phb_io_space(struct pci_controller *hose) +{ + pcibios_map_phb_io_space(hose); +} + +#define IOBASE_BRIDGE_NUMBER 0 +#define IOBASE_MEMORY 1 +#define IOBASE_IO 2 +#define IOBASE_ISA_IO 3 +#define IOBASE_ISA_MEM 4 + +SYSCALL_DEFINE3(pciconfig_iobase, long, which, unsigned long, in_bus, + unsigned long, in_devfn) +{ + struct pci_controller* hose; + struct pci_bus *tmp_bus, *bus = NULL; + struct device_node *hose_node; + + /* Argh ! Please forgive me for that hack, but that's the + * simplest way to get existing XFree to not lockup on some + * G5 machines... So when something asks for bus 0 io base + * (bus 0 is HT root), we return the AGP one instead. + */ + if (in_bus == 0 && of_machine_is_compatible("MacRISC4")) { + struct device_node *agp; + + agp = of_find_compatible_node(NULL, NULL, "u3-agp"); + if (agp) + in_bus = 0xf0; + of_node_put(agp); + } + + /* That syscall isn't quite compatible with PCI domains, but it's + * used on pre-domains setup. We return the first match + */ + + list_for_each_entry(tmp_bus, &pci_root_buses, node) { + if (in_bus >= tmp_bus->number && + in_bus <= tmp_bus->busn_res.end) { + bus = tmp_bus; + break; + } + } + if (bus == NULL || bus->dev.of_node == NULL) + return -ENODEV; + + hose_node = bus->dev.of_node; + hose = PCI_DN(hose_node)->phb; + + switch (which) { + case IOBASE_BRIDGE_NUMBER: + return (long)hose->first_busno; + case IOBASE_MEMORY: + return (long)hose->mem_offset[0]; + case IOBASE_IO: + return (long)hose->io_base_phys; + case IOBASE_ISA_IO: + return (long)isa_io_base; + case IOBASE_ISA_MEM: + return -EINVAL; + } + + return -EOPNOTSUPP; +} + +#ifdef CONFIG_NUMA +int pcibus_to_node(struct pci_bus *bus) +{ + struct pci_controller *phb = pci_bus_to_host(bus); + return phb->node; +} +EXPORT_SYMBOL(pcibus_to_node); +#endif + +#ifdef CONFIG_PPC_PMAC +int pci_device_from_OF_node(struct device_node *np, u8 *bus, u8 *devfn) +{ + if (!PCI_DN(np)) + return -ENODEV; + *bus = PCI_DN(np)->busno; + *devfn = PCI_DN(np)->devfn; + return 0; +} +#endif diff --git a/arch/powerpc/kernel/pci_dn.c b/arch/powerpc/kernel/pci_dn.c new file mode 100644 index 000000000..38561d6a2 --- /dev/null +++ b/arch/powerpc/kernel/pci_dn.c @@ -0,0 +1,496 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * pci_dn.c + * + * Copyright (C) 2001 Todd Inglett, IBM Corporation + * + * PCI manipulation via device_nodes. + */ +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/string.h> +#include <linux/export.h> +#include <linux/init.h> +#include <linux/gfp.h> +#include <linux/of.h> + +#include <asm/io.h> +#include <asm/pci-bridge.h> +#include <asm/ppc-pci.h> +#include <asm/firmware.h> +#include <asm/eeh.h> + +/* + * The function is used to find the firmware data of one + * specific PCI device, which is attached to the indicated + * PCI bus. For VFs, their firmware data is linked to that + * one of PF's bridge. For other devices, their firmware + * data is linked to that of their bridge. + */ +static struct pci_dn *pci_bus_to_pdn(struct pci_bus *bus) +{ + struct pci_bus *pbus; + struct device_node *dn; + struct pci_dn *pdn; + + /* + * We probably have virtual bus which doesn't + * have associated bridge. + */ + pbus = bus; + while (pbus) { + if (pci_is_root_bus(pbus) || pbus->self) + break; + + pbus = pbus->parent; + } + + /* + * Except virtual bus, all PCI buses should + * have device nodes. + */ + dn = pci_bus_to_OF_node(pbus); + pdn = dn ? PCI_DN(dn) : NULL; + + return pdn; +} + +struct pci_dn *pci_get_pdn_by_devfn(struct pci_bus *bus, + int devfn) +{ + struct device_node *dn = NULL; + struct pci_dn *parent, *pdn; + struct pci_dev *pdev = NULL; + + /* Fast path: fetch from PCI device */ + list_for_each_entry(pdev, &bus->devices, bus_list) { + if (pdev->devfn == devfn) { + if (pdev->dev.archdata.pci_data) + return pdev->dev.archdata.pci_data; + + dn = pci_device_to_OF_node(pdev); + break; + } + } + + /* Fast path: fetch from device node */ + pdn = dn ? PCI_DN(dn) : NULL; + if (pdn) + return pdn; + + /* Slow path: fetch from firmware data hierarchy */ + parent = pci_bus_to_pdn(bus); + if (!parent) + return NULL; + + list_for_each_entry(pdn, &parent->child_list, list) { + if (pdn->busno == bus->number && + pdn->devfn == devfn) + return pdn; + } + + return NULL; +} + +struct pci_dn *pci_get_pdn(struct pci_dev *pdev) +{ + struct device_node *dn; + struct pci_dn *parent, *pdn; + + /* Search device directly */ + if (pdev->dev.archdata.pci_data) + return pdev->dev.archdata.pci_data; + + /* Check device node */ + dn = pci_device_to_OF_node(pdev); + pdn = dn ? PCI_DN(dn) : NULL; + if (pdn) + return pdn; + + /* + * VFs don't have device nodes. We hook their + * firmware data to PF's bridge. + */ + parent = pci_bus_to_pdn(pdev->bus); + if (!parent) + return NULL; + + list_for_each_entry(pdn, &parent->child_list, list) { + if (pdn->busno == pdev->bus->number && + pdn->devfn == pdev->devfn) + return pdn; + } + + return NULL; +} + +#ifdef CONFIG_EEH +static struct eeh_dev *eeh_dev_init(struct pci_dn *pdn) +{ + struct eeh_dev *edev; + + /* Allocate EEH device */ + edev = kzalloc(sizeof(*edev), GFP_KERNEL); + if (!edev) + return NULL; + + /* Associate EEH device with OF node */ + pdn->edev = edev; + edev->pdn = pdn; + edev->bdfn = (pdn->busno << 8) | pdn->devfn; + edev->controller = pdn->phb; + + return edev; +} +#endif /* CONFIG_EEH */ + +#ifdef CONFIG_PCI_IOV +static struct pci_dn *add_one_sriov_vf_pdn(struct pci_dn *parent, + int busno, int devfn) +{ + struct pci_dn *pdn; + + /* Except PHB, we always have the parent */ + if (!parent) + return NULL; + + pdn = kzalloc(sizeof(*pdn), GFP_KERNEL); + if (!pdn) + return NULL; + + pdn->phb = parent->phb; + pdn->parent = parent; + pdn->busno = busno; + pdn->devfn = devfn; + pdn->pe_number = IODA_INVALID_PE; + INIT_LIST_HEAD(&pdn->child_list); + INIT_LIST_HEAD(&pdn->list); + list_add_tail(&pdn->list, &parent->child_list); + + return pdn; +} + +struct pci_dn *add_sriov_vf_pdns(struct pci_dev *pdev) +{ + struct pci_dn *parent, *pdn; + int i; + + /* Only support IOV for now */ + if (WARN_ON(!pdev->is_physfn)) + return NULL; + + /* Check if VFs have been populated */ + pdn = pci_get_pdn(pdev); + if (!pdn || (pdn->flags & PCI_DN_FLAG_IOV_VF)) + return NULL; + + pdn->flags |= PCI_DN_FLAG_IOV_VF; + parent = pci_bus_to_pdn(pdev->bus); + if (!parent) + return NULL; + + for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) { + struct eeh_dev *edev __maybe_unused; + + pdn = add_one_sriov_vf_pdn(parent, + pci_iov_virtfn_bus(pdev, i), + pci_iov_virtfn_devfn(pdev, i)); + if (!pdn) { + dev_warn(&pdev->dev, "%s: Cannot create firmware data for VF#%d\n", + __func__, i); + return NULL; + } + +#ifdef CONFIG_EEH + /* Create the EEH device for the VF */ + edev = eeh_dev_init(pdn); + BUG_ON(!edev); + + /* FIXME: these should probably be populated by the EEH probe */ + edev->physfn = pdev; + edev->vf_index = i; +#endif /* CONFIG_EEH */ + } + return pci_get_pdn(pdev); +} + +void remove_sriov_vf_pdns(struct pci_dev *pdev) +{ + struct pci_dn *parent; + struct pci_dn *pdn, *tmp; + int i; + + /* Only support IOV PF for now */ + if (WARN_ON(!pdev->is_physfn)) + return; + + /* Check if VFs have been populated */ + pdn = pci_get_pdn(pdev); + if (!pdn || !(pdn->flags & PCI_DN_FLAG_IOV_VF)) + return; + + pdn->flags &= ~PCI_DN_FLAG_IOV_VF; + parent = pci_bus_to_pdn(pdev->bus); + if (!parent) + return; + + /* + * We might introduce flag to pci_dn in future + * so that we can release VF's firmware data in + * a batch mode. + */ + for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) { + struct eeh_dev *edev __maybe_unused; + + list_for_each_entry_safe(pdn, tmp, + &parent->child_list, list) { + if (pdn->busno != pci_iov_virtfn_bus(pdev, i) || + pdn->devfn != pci_iov_virtfn_devfn(pdev, i)) + continue; + +#ifdef CONFIG_EEH + /* + * Release EEH state for this VF. The PCI core + * has already torn down the pci_dev for this VF, but + * we're responsible to removing the eeh_dev since it + * has the same lifetime as the pci_dn that spawned it. + */ + edev = pdn_to_eeh_dev(pdn); + if (edev) { + /* + * We allocate pci_dn's for the totalvfs count, + * but only the vfs that were activated + * have a configured PE. + */ + if (edev->pe) + eeh_pe_tree_remove(edev); + + pdn->edev = NULL; + kfree(edev); + } +#endif /* CONFIG_EEH */ + + if (!list_empty(&pdn->list)) + list_del(&pdn->list); + + kfree(pdn); + } + } +} +#endif /* CONFIG_PCI_IOV */ + +struct pci_dn *pci_add_device_node_info(struct pci_controller *hose, + struct device_node *dn) +{ + const __be32 *type = of_get_property(dn, "ibm,pci-config-space-type", NULL); + const __be32 *regs; + struct device_node *parent; + struct pci_dn *pdn; +#ifdef CONFIG_EEH + struct eeh_dev *edev; +#endif + + pdn = kzalloc(sizeof(*pdn), GFP_KERNEL); + if (pdn == NULL) + return NULL; + dn->data = pdn; + pdn->phb = hose; + pdn->pe_number = IODA_INVALID_PE; + regs = of_get_property(dn, "reg", NULL); + if (regs) { + u32 addr = of_read_number(regs, 1); + + /* First register entry is addr (00BBSS00) */ + pdn->busno = (addr >> 16) & 0xff; + pdn->devfn = (addr >> 8) & 0xff; + } + + /* vendor/device IDs and class code */ + regs = of_get_property(dn, "vendor-id", NULL); + pdn->vendor_id = regs ? of_read_number(regs, 1) : 0; + regs = of_get_property(dn, "device-id", NULL); + pdn->device_id = regs ? of_read_number(regs, 1) : 0; + regs = of_get_property(dn, "class-code", NULL); + pdn->class_code = regs ? of_read_number(regs, 1) : 0; + + /* Extended config space */ + pdn->pci_ext_config_space = (type && of_read_number(type, 1) == 1); + + /* Create EEH device */ +#ifdef CONFIG_EEH + edev = eeh_dev_init(pdn); + if (!edev) { + kfree(pdn); + return NULL; + } +#endif + + /* Attach to parent node */ + INIT_LIST_HEAD(&pdn->child_list); + INIT_LIST_HEAD(&pdn->list); + parent = of_get_parent(dn); + pdn->parent = parent ? PCI_DN(parent) : NULL; + of_node_put(parent); + if (pdn->parent) + list_add_tail(&pdn->list, &pdn->parent->child_list); + + return pdn; +} +EXPORT_SYMBOL_GPL(pci_add_device_node_info); + +void pci_remove_device_node_info(struct device_node *dn) +{ + struct pci_dn *pdn = dn ? PCI_DN(dn) : NULL; + struct device_node *parent; + struct pci_dev *pdev; +#ifdef CONFIG_EEH + struct eeh_dev *edev = pdn_to_eeh_dev(pdn); + + if (edev) + edev->pdn = NULL; +#endif + + if (!pdn) + return; + + WARN_ON(!list_empty(&pdn->child_list)); + list_del(&pdn->list); + + /* Drop the parent pci_dn's ref to our backing dt node */ + parent = of_get_parent(dn); + if (parent) + of_node_put(parent); + + /* + * At this point we *might* still have a pci_dev that was + * instantiated from this pci_dn. So defer free()ing it until + * the pci_dev's release function is called. + */ + pdev = pci_get_domain_bus_and_slot(pdn->phb->global_number, + pdn->busno, pdn->devfn); + if (pdev) { + /* NB: pdev has a ref to dn */ + pci_dbg(pdev, "marked pdn (from %pOF) as dead\n", dn); + pdn->flags |= PCI_DN_FLAG_DEAD; + } else { + dn->data = NULL; + kfree(pdn); + } + + pci_dev_put(pdev); +} +EXPORT_SYMBOL_GPL(pci_remove_device_node_info); + +/* + * Traverse a device tree stopping each PCI device in the tree. + * This is done depth first. As each node is processed, a "pre" + * function is called and the children are processed recursively. + * + * The "pre" func returns a value. If non-zero is returned from + * the "pre" func, the traversal stops and this value is returned. + * This return value is useful when using traverse as a method of + * finding a device. + * + * NOTE: we do not run the func for devices that do not appear to + * be PCI except for the start node which we assume (this is good + * because the start node is often a phb which may be missing PCI + * properties). + * We use the class-code as an indicator. If we run into + * one of these nodes we also assume its siblings are non-pci for + * performance. + */ +void *pci_traverse_device_nodes(struct device_node *start, + void *(*fn)(struct device_node *, void *), + void *data) +{ + struct device_node *dn, *nextdn; + void *ret; + + /* We started with a phb, iterate all childs */ + for (dn = start->child; dn; dn = nextdn) { + const __be32 *classp; + u32 class = 0; + + nextdn = NULL; + classp = of_get_property(dn, "class-code", NULL); + if (classp) + class = of_read_number(classp, 1); + + if (fn) { + ret = fn(dn, data); + if (ret) + return ret; + } + + /* If we are a PCI bridge, go down */ + if (dn->child && ((class >> 8) == PCI_CLASS_BRIDGE_PCI || + (class >> 8) == PCI_CLASS_BRIDGE_CARDBUS)) + /* Depth first...do children */ + nextdn = dn->child; + else if (dn->sibling) + /* ok, try next sibling instead. */ + nextdn = dn->sibling; + if (!nextdn) { + /* Walk up to next valid sibling. */ + do { + dn = dn->parent; + if (dn == start) + return NULL; + } while (dn->sibling == NULL); + nextdn = dn->sibling; + } + } + return NULL; +} +EXPORT_SYMBOL_GPL(pci_traverse_device_nodes); + +static void *add_pdn(struct device_node *dn, void *data) +{ + struct pci_controller *hose = data; + struct pci_dn *pdn; + + pdn = pci_add_device_node_info(hose, dn); + if (!pdn) + return ERR_PTR(-ENOMEM); + + return NULL; +} + +/** + * pci_devs_phb_init_dynamic - setup pci devices under this PHB + * phb: pci-to-host bridge (top-level bridge connecting to cpu) + * + * This routine is called both during boot, (before the memory + * subsystem is set up, before kmalloc is valid) and during the + * dynamic lpar operation of adding a PHB to a running system. + */ +void pci_devs_phb_init_dynamic(struct pci_controller *phb) +{ + struct device_node *dn = phb->dn; + struct pci_dn *pdn; + + /* PHB nodes themselves must not match */ + pdn = pci_add_device_node_info(phb, dn); + if (pdn) { + pdn->devfn = pdn->busno = -1; + pdn->vendor_id = pdn->device_id = pdn->class_code = 0; + pdn->phb = phb; + phb->pci_data = pdn; + } + + /* Update dn->phb ptrs for new phb and children devices */ + pci_traverse_device_nodes(dn, add_pdn, phb); +} + +static void pci_dev_pdn_setup(struct pci_dev *pdev) +{ + struct pci_dn *pdn; + + if (pdev->dev.archdata.pci_data) + return; + + /* Setup the fast path */ + pdn = pci_get_pdn(pdev); + pdev->dev.archdata.pci_data = pdn; +} +DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, pci_dev_pdn_setup); diff --git a/arch/powerpc/kernel/pci_of_scan.c b/arch/powerpc/kernel/pci_of_scan.c new file mode 100644 index 000000000..756043dd0 --- /dev/null +++ b/arch/powerpc/kernel/pci_of_scan.c @@ -0,0 +1,447 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Helper routines to scan the device tree for PCI devices and busses + * + * Migrated out of PowerPC architecture pci_64.c file by Grant Likely + * <grant.likely@secretlab.ca> so that these routines are available for + * 32 bit also. + * + * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM + * Rework, based on alpha PCI code. + * Copyright (c) 2009 Secret Lab Technologies Ltd. + */ + +#include <linux/pci.h> +#include <linux/export.h> +#include <linux/of.h> +#include <asm/pci-bridge.h> + +/** + * get_int_prop - Decode a u32 from a device tree property + */ +static u32 get_int_prop(struct device_node *np, const char *name, u32 def) +{ + const __be32 *prop; + int len; + + prop = of_get_property(np, name, &len); + if (prop && len >= 4) + return of_read_number(prop, 1); + return def; +} + +/** + * pci_parse_of_flags - Parse the flags cell of a device tree PCI address + * @addr0: value of 1st cell of a device tree PCI address. + * @bridge: Set this flag if the address is from a bridge 'ranges' property + * + * PCI Bus Binding to IEEE Std 1275-1994 + * + * Bit# 33222222 22221111 11111100 00000000 + * 10987654 32109876 54321098 76543210 + * phys.hi cell: npt000ss bbbbbbbb dddddfff rrrrrrrr + * phys.mid cell: hhhhhhhh hhhhhhhh hhhhhhhh hhhhhhhh + * phys.lo cell: llllllll llllllll llllllll llllllll + * + * where: + * n is 0 if the address is relocatable, 1 otherwise + * p is 1 if the addressable region is "prefetchable", 0 otherwise + * t is 1 if the address is aliased (for non-relocatable I/O), + * below 1 MB (for Memory),or below 64 KB (for relocatable I/O). + * ss is the space code, denoting the address space: + * 00 denotes Configuration Space + * 01 denotes I/O Space + * 10 denotes 32-bit-address Memory Space + * 11 denotes 64-bit-address Memory Space + * bbbbbbbb is the 8-bit Bus Number + * ddddd is the 5-bit Device Number + * fff is the 3-bit Function Number + * rrrrrrrr is the 8-bit Register Number + */ +#define OF_PCI_ADDR0_SPACE(ss) (((ss)&3)<<24) +#define OF_PCI_ADDR0_SPACE_CFG OF_PCI_ADDR0_SPACE(0) +#define OF_PCI_ADDR0_SPACE_IO OF_PCI_ADDR0_SPACE(1) +#define OF_PCI_ADDR0_SPACE_MMIO32 OF_PCI_ADDR0_SPACE(2) +#define OF_PCI_ADDR0_SPACE_MMIO64 OF_PCI_ADDR0_SPACE(3) +#define OF_PCI_ADDR0_SPACE_MASK OF_PCI_ADDR0_SPACE(3) +#define OF_PCI_ADDR0_RELOC (1UL<<31) +#define OF_PCI_ADDR0_PREFETCH (1UL<<30) +#define OF_PCI_ADDR0_ALIAS (1UL<<29) +#define OF_PCI_ADDR0_BUS 0x00FF0000UL +#define OF_PCI_ADDR0_DEV 0x0000F800UL +#define OF_PCI_ADDR0_FN 0x00000700UL +#define OF_PCI_ADDR0_BARREG 0x000000FFUL + +unsigned int pci_parse_of_flags(u32 addr0, int bridge) +{ + unsigned int flags = 0, as = addr0 & OF_PCI_ADDR0_SPACE_MASK; + + if (as == OF_PCI_ADDR0_SPACE_MMIO32 || as == OF_PCI_ADDR0_SPACE_MMIO64) { + flags = IORESOURCE_MEM | PCI_BASE_ADDRESS_SPACE_MEMORY; + + if (as == OF_PCI_ADDR0_SPACE_MMIO64) + flags |= PCI_BASE_ADDRESS_MEM_TYPE_64 | IORESOURCE_MEM_64; + + if (addr0 & OF_PCI_ADDR0_ALIAS) + flags |= PCI_BASE_ADDRESS_MEM_TYPE_1M; + + if (addr0 & OF_PCI_ADDR0_PREFETCH) + flags |= IORESOURCE_PREFETCH | + PCI_BASE_ADDRESS_MEM_PREFETCH; + + /* Note: We don't know whether the ROM has been left enabled + * by the firmware or not. We mark it as disabled (ie, we do + * not set the IORESOURCE_ROM_ENABLE flag) for now rather than + * do a config space read, it will be force-enabled if needed + */ + if (!bridge && (addr0 & OF_PCI_ADDR0_BARREG) == PCI_ROM_ADDRESS) + flags |= IORESOURCE_READONLY; + + } else if (as == OF_PCI_ADDR0_SPACE_IO) + flags = IORESOURCE_IO | PCI_BASE_ADDRESS_SPACE_IO; + + if (flags) + flags |= IORESOURCE_SIZEALIGN; + + return flags; +} + +/** + * of_pci_parse_addrs - Parse PCI addresses assigned in the device tree node + * @node: device tree node for the PCI device + * @dev: pci_dev structure for the device + * + * This function parses the 'assigned-addresses' property of a PCI devices' + * device tree node and writes them into the associated pci_dev structure. + */ +static void of_pci_parse_addrs(struct device_node *node, struct pci_dev *dev) +{ + u64 base, size; + unsigned int flags; + struct pci_bus_region region; + struct resource *res; + const __be32 *addrs; + u32 i; + int proplen; + bool mark_unset = false; + + addrs = of_get_property(node, "assigned-addresses", &proplen); + if (!addrs || !proplen) { + addrs = of_get_property(node, "reg", &proplen); + if (!addrs || !proplen) + return; + mark_unset = true; + } + + pr_debug(" parse addresses (%d bytes) @ %p\n", proplen, addrs); + for (; proplen >= 20; proplen -= 20, addrs += 5) { + flags = pci_parse_of_flags(of_read_number(addrs, 1), 0); + if (!flags) + continue; + base = of_read_number(&addrs[1], 2); + size = of_read_number(&addrs[3], 2); + if (!size) + continue; + i = of_read_number(addrs, 1) & 0xff; + pr_debug(" base: %llx, size: %llx, i: %x\n", + (unsigned long long)base, + (unsigned long long)size, i); + + if (PCI_BASE_ADDRESS_0 <= i && i <= PCI_BASE_ADDRESS_5) { + res = &dev->resource[(i - PCI_BASE_ADDRESS_0) >> 2]; + } else if (i == dev->rom_base_reg) { + res = &dev->resource[PCI_ROM_RESOURCE]; + flags |= IORESOURCE_READONLY; + } else { + printk(KERN_ERR "PCI: bad cfg reg num 0x%x\n", i); + continue; + } + res->flags = flags; + if (mark_unset) + res->flags |= IORESOURCE_UNSET; + res->name = pci_name(dev); + region.start = base; + region.end = base + size - 1; + pcibios_bus_to_resource(dev->bus, res, ®ion); + } +} + +/** + * of_create_pci_dev - Given a device tree node on a pci bus, create a pci_dev + * @node: device tree node pointer + * @bus: bus the device is sitting on + * @devfn: PCI function number, extracted from device tree by caller. + */ +struct pci_dev *of_create_pci_dev(struct device_node *node, + struct pci_bus *bus, int devfn) +{ + struct pci_dev *dev; + + dev = pci_alloc_dev(bus); + if (!dev) + return NULL; + + pr_debug(" create device, devfn: %x, type: %s\n", devfn, + of_node_get_device_type(node)); + + dev->dev.of_node = of_node_get(node); + dev->dev.parent = bus->bridge; + dev->dev.bus = &pci_bus_type; + dev->devfn = devfn; + dev->multifunction = 0; /* maybe a lie? */ + dev->needs_freset = 0; /* pcie fundamental reset required */ + set_pcie_port_type(dev); + + pci_dev_assign_slot(dev); + dev->vendor = get_int_prop(node, "vendor-id", 0xffff); + dev->device = get_int_prop(node, "device-id", 0xffff); + dev->subsystem_vendor = get_int_prop(node, "subsystem-vendor-id", 0); + dev->subsystem_device = get_int_prop(node, "subsystem-id", 0); + + dev->cfg_size = pci_cfg_space_size(dev); + + dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(bus), + dev->bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn)); + dev->class = get_int_prop(node, "class-code", 0); + dev->revision = get_int_prop(node, "revision-id", 0); + + pr_debug(" class: 0x%x\n", dev->class); + pr_debug(" revision: 0x%x\n", dev->revision); + + dev->current_state = PCI_UNKNOWN; /* unknown power state */ + dev->error_state = pci_channel_io_normal; + dev->dma_mask = 0xffffffff; + + /* Early fixups, before probing the BARs */ + pci_fixup_device(pci_fixup_early, dev); + + if (of_node_is_type(node, "pci") || of_node_is_type(node, "pciex")) { + /* a PCI-PCI bridge */ + dev->hdr_type = PCI_HEADER_TYPE_BRIDGE; + dev->rom_base_reg = PCI_ROM_ADDRESS1; + set_pcie_hotplug_bridge(dev); + } else if (of_node_is_type(node, "cardbus")) { + dev->hdr_type = PCI_HEADER_TYPE_CARDBUS; + } else { + dev->hdr_type = PCI_HEADER_TYPE_NORMAL; + dev->rom_base_reg = PCI_ROM_ADDRESS; + /* Maybe do a default OF mapping here */ + dev->irq = 0; + } + + of_pci_parse_addrs(node, dev); + + pr_debug(" adding to system ...\n"); + + pci_device_add(dev, bus); + + return dev; +} +EXPORT_SYMBOL(of_create_pci_dev); + +/** + * of_scan_pci_bridge - Set up a PCI bridge and scan for child nodes + * @dev: pci_dev structure for the bridge + * + * of_scan_bus() calls this routine for each PCI bridge that it finds, and + * this routine in turn call of_scan_bus() recursively to scan for more child + * devices. + */ +void of_scan_pci_bridge(struct pci_dev *dev) +{ + struct device_node *node = dev->dev.of_node; + struct pci_bus *bus; + struct pci_controller *phb; + const __be32 *busrange, *ranges; + int len, i, mode; + struct pci_bus_region region; + struct resource *res; + unsigned int flags; + u64 size; + + pr_debug("of_scan_pci_bridge(%pOF)\n", node); + + /* parse bus-range property */ + busrange = of_get_property(node, "bus-range", &len); + if (busrange == NULL || len != 8) { + printk(KERN_DEBUG "Can't get bus-range for PCI-PCI bridge %pOF\n", + node); + return; + } + ranges = of_get_property(node, "ranges", &len); + if (ranges == NULL) { + printk(KERN_DEBUG "Can't get ranges for PCI-PCI bridge %pOF\n", + node); + return; + } + + bus = pci_find_bus(pci_domain_nr(dev->bus), + of_read_number(busrange, 1)); + if (!bus) { + bus = pci_add_new_bus(dev->bus, dev, + of_read_number(busrange, 1)); + if (!bus) { + printk(KERN_ERR "Failed to create pci bus for %pOF\n", + node); + return; + } + } + + bus->primary = dev->bus->number; + pci_bus_insert_busn_res(bus, of_read_number(busrange, 1), + of_read_number(busrange+1, 1)); + bus->bridge_ctl = 0; + + /* parse ranges property */ + /* PCI #address-cells == 3 and #size-cells == 2 always */ + res = &dev->resource[PCI_BRIDGE_RESOURCES]; + for (i = 0; i < PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES; ++i) { + res->flags = 0; + bus->resource[i] = res; + ++res; + } + i = 1; + for (; len >= 32; len -= 32, ranges += 8) { + flags = pci_parse_of_flags(of_read_number(ranges, 1), 1); + size = of_read_number(&ranges[6], 2); + if (flags == 0 || size == 0) + continue; + if (flags & IORESOURCE_IO) { + res = bus->resource[0]; + if (res->flags) { + printk(KERN_ERR "PCI: ignoring extra I/O range" + " for bridge %pOF\n", node); + continue; + } + } else { + if (i >= PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES) { + printk(KERN_ERR "PCI: too many memory ranges" + " for bridge %pOF\n", node); + continue; + } + res = bus->resource[i]; + ++i; + } + res->flags = flags; + region.start = of_read_number(&ranges[1], 2); + region.end = region.start + size - 1; + pcibios_bus_to_resource(dev->bus, res, ®ion); + } + sprintf(bus->name, "PCI Bus %04x:%02x", pci_domain_nr(bus), + bus->number); + pr_debug(" bus name: %s\n", bus->name); + + phb = pci_bus_to_host(bus); + + mode = PCI_PROBE_NORMAL; + if (phb->controller_ops.probe_mode) + mode = phb->controller_ops.probe_mode(bus); + pr_debug(" probe mode: %d\n", mode); + + if (mode == PCI_PROBE_DEVTREE) + of_scan_bus(node, bus); + else if (mode == PCI_PROBE_NORMAL) + pci_scan_child_bus(bus); +} +EXPORT_SYMBOL(of_scan_pci_bridge); + +static struct pci_dev *of_scan_pci_dev(struct pci_bus *bus, + struct device_node *dn) +{ + struct pci_dev *dev = NULL; + const __be32 *reg; + int reglen, devfn; +#ifdef CONFIG_EEH + struct eeh_dev *edev = pdn_to_eeh_dev(PCI_DN(dn)); +#endif + + pr_debug(" * %pOF\n", dn); + if (!of_device_is_available(dn)) + return NULL; + + reg = of_get_property(dn, "reg", ®len); + if (reg == NULL || reglen < 20) + return NULL; + devfn = (of_read_number(reg, 1) >> 8) & 0xff; + + /* Check if the PCI device is already there */ + dev = pci_get_slot(bus, devfn); + if (dev) { + pci_dev_put(dev); + return dev; + } + + /* Device removed permanently ? */ +#ifdef CONFIG_EEH + if (edev && (edev->mode & EEH_DEV_REMOVED)) + return NULL; +#endif + + /* create a new pci_dev for this device */ + dev = of_create_pci_dev(dn, bus, devfn); + if (!dev) + return NULL; + + pr_debug(" dev header type: %x\n", dev->hdr_type); + return dev; +} + +/** + * __of_scan_bus - given a PCI bus node, setup bus and scan for child devices + * @node: device tree node for the PCI bus + * @bus: pci_bus structure for the PCI bus + * @rescan_existing: Flag indicating bus has already been set up + */ +static void __of_scan_bus(struct device_node *node, struct pci_bus *bus, + int rescan_existing) +{ + struct device_node *child; + struct pci_dev *dev; + + pr_debug("of_scan_bus(%pOF) bus no %d...\n", + node, bus->number); + + /* Scan direct children */ + for_each_child_of_node(node, child) { + dev = of_scan_pci_dev(bus, child); + if (!dev) + continue; + pr_debug(" dev header type: %x\n", dev->hdr_type); + } + + /* Apply all fixups necessary. We don't fixup the bus "self" + * for an existing bridge that is being rescanned + */ + if (!rescan_existing) + pcibios_setup_bus_self(bus); + + /* Now scan child busses */ + for_each_pci_bridge(dev, bus) + of_scan_pci_bridge(dev); +} + +/** + * of_scan_bus - given a PCI bus node, setup bus and scan for child devices + * @node: device tree node for the PCI bus + * @bus: pci_bus structure for the PCI bus + */ +void of_scan_bus(struct device_node *node, struct pci_bus *bus) +{ + __of_scan_bus(node, bus, 0); +} +EXPORT_SYMBOL_GPL(of_scan_bus); + +/** + * of_rescan_bus - given a PCI bus node, scan for child devices + * @node: device tree node for the PCI bus + * @bus: pci_bus structure for the PCI bus + * + * Same as of_scan_bus, but for a pci_bus structure that has already been + * setup. + */ +void of_rescan_bus(struct device_node *node, struct pci_bus *bus) +{ + __of_scan_bus(node, bus, 1); +} +EXPORT_SYMBOL_GPL(of_rescan_bus); + diff --git a/arch/powerpc/kernel/pmc.c b/arch/powerpc/kernel/pmc.c new file mode 100644 index 000000000..15414c8a2 --- /dev/null +++ b/arch/powerpc/kernel/pmc.c @@ -0,0 +1,98 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * arch/powerpc/kernel/pmc.c + * + * Copyright (C) 2004 David Gibson, IBM Corporation. + * Includes code formerly from arch/ppc/kernel/perfmon.c: + * Author: Andy Fleming + * Copyright (c) 2004 Freescale Semiconductor, Inc + */ + +#include <linux/errno.h> +#include <linux/bug.h> +#include <linux/spinlock.h> +#include <linux/export.h> + +#include <asm/processor.h> +#include <asm/cputable.h> +#include <asm/pmc.h> + +#ifndef MMCR0_PMAO +#define MMCR0_PMAO 0 +#endif + +static void dummy_perf(struct pt_regs *regs) +{ +#if defined(CONFIG_FSL_EMB_PERFMON) + mtpmr(PMRN_PMGC0, mfpmr(PMRN_PMGC0) & ~PMGC0_PMIE); +#elif defined(CONFIG_PPC64) || defined(CONFIG_PPC_BOOK3S_32) + if (cur_cpu_spec->pmc_type == PPC_PMC_IBM) + mtspr(SPRN_MMCR0, mfspr(SPRN_MMCR0) & ~(MMCR0_PMXE|MMCR0_PMAO)); +#else + mtspr(SPRN_MMCR0, mfspr(SPRN_MMCR0) & ~MMCR0_PMXE); +#endif +} + + +static DEFINE_RAW_SPINLOCK(pmc_owner_lock); +static void *pmc_owner_caller; /* mostly for debugging */ +perf_irq_t perf_irq = dummy_perf; + +int reserve_pmc_hardware(perf_irq_t new_perf_irq) +{ + int err = 0; + + raw_spin_lock(&pmc_owner_lock); + + if (pmc_owner_caller) { + printk(KERN_WARNING "reserve_pmc_hardware: " + "PMC hardware busy (reserved by caller %p)\n", + pmc_owner_caller); + err = -EBUSY; + goto out; + } + + pmc_owner_caller = __builtin_return_address(0); + perf_irq = new_perf_irq ? new_perf_irq : dummy_perf; + + out: + raw_spin_unlock(&pmc_owner_lock); + return err; +} +EXPORT_SYMBOL_GPL(reserve_pmc_hardware); + +void release_pmc_hardware(void) +{ + raw_spin_lock(&pmc_owner_lock); + + WARN_ON(! pmc_owner_caller); + + pmc_owner_caller = NULL; + perf_irq = dummy_perf; + + raw_spin_unlock(&pmc_owner_lock); +} +EXPORT_SYMBOL_GPL(release_pmc_hardware); + +#ifdef CONFIG_PPC64 +void power4_enable_pmcs(void) +{ + unsigned long hid0; + + hid0 = mfspr(SPRN_HID0); + hid0 |= 1UL << (63 - 20); + + /* POWER4 requires the following sequence */ + asm volatile( + "sync\n" + "mtspr %1, %0\n" + "mfspr %0, %1\n" + "mfspr %0, %1\n" + "mfspr %0, %1\n" + "mfspr %0, %1\n" + "mfspr %0, %1\n" + "mfspr %0, %1\n" + "isync" : "=&r" (hid0) : "i" (SPRN_HID0), "0" (hid0): + "memory"); +} +#endif /* CONFIG_PPC64 */ diff --git a/arch/powerpc/kernel/ppc_save_regs.S b/arch/powerpc/kernel/ppc_save_regs.S new file mode 100644 index 000000000..235ae2428 --- /dev/null +++ b/arch/powerpc/kernel/ppc_save_regs.S @@ -0,0 +1,53 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 1996 Paul Mackerras. + * + * NOTE: assert(sizeof(buf) > 23 * sizeof(long)) + */ +#include <asm/processor.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/ptrace.h> +#include <asm/asm-compat.h> + +/* + * Grab the register values as they are now. + * This won't do a particularly good job because we really + * want our caller's caller's registers, and our caller has + * already executed its prologue. + * ToDo: We could reach back into the caller's save area to do + * a better job of representing the caller's state (note that + * that will be different for 32-bit and 64-bit, because of the + * different ABIs, though). + */ +_GLOBAL(ppc_save_regs) + /* This allows stack frame accessor macros and offsets to be used */ + subi r3,r3,STACK_FRAME_OVERHEAD + PPC_STL r0,GPR0(r3) +#ifdef CONFIG_PPC32 + stmw r2,GPR2(r3) +#else + SAVE_GPRS(2, 31, r3) + lbz r0,PACAIRQSOFTMASK(r13) + PPC_STL r0,SOFTE(r3) +#endif + /* store current SP */ + PPC_STL r1,GPR1(r3) + /* get caller's LR */ + PPC_LL r4,0(r1) + PPC_LL r0,LRSAVE(r4) + PPC_STL r0,_LINK(r3) + mflr r0 + PPC_STL r0,_NIP(r3) + mfmsr r0 + PPC_STL r0,_MSR(r3) + mfctr r0 + PPC_STL r0,_CTR(r3) + mfxer r0 + PPC_STL r0,_XER(r3) + mfcr r0 + PPC_STL r0,_CCR(r3) + li r0,0 + PPC_STL r0,_TRAP(r3) + PPC_STL r0,ORIG_GPR3(r3) + blr diff --git a/arch/powerpc/kernel/proc_powerpc.c b/arch/powerpc/kernel/proc_powerpc.c new file mode 100644 index 000000000..b109cd7b5 --- /dev/null +++ b/arch/powerpc/kernel/proc_powerpc.c @@ -0,0 +1,93 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation + */ + +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/proc_fs.h> +#include <linux/kernel.h> +#include <linux/of.h> + +#include <asm/machdep.h> +#include <asm/vdso_datapage.h> +#include <asm/rtas.h> +#include <linux/uaccess.h> + +#ifdef CONFIG_PPC64 + +static loff_t page_map_seek(struct file *file, loff_t off, int whence) +{ + return fixed_size_llseek(file, off, whence, PAGE_SIZE); +} + +static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes, + loff_t *ppos) +{ + return simple_read_from_buffer(buf, nbytes, ppos, + pde_data(file_inode(file)), PAGE_SIZE); +} + +static int page_map_mmap( struct file *file, struct vm_area_struct *vma ) +{ + if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) + return -EINVAL; + + remap_pfn_range(vma, vma->vm_start, + __pa(pde_data(file_inode(file))) >> PAGE_SHIFT, + PAGE_SIZE, vma->vm_page_prot); + return 0; +} + +static const struct proc_ops page_map_proc_ops = { + .proc_lseek = page_map_seek, + .proc_read = page_map_read, + .proc_mmap = page_map_mmap, +}; + + +static int __init proc_ppc64_init(void) +{ + struct proc_dir_entry *pde; + + pde = proc_create_data("powerpc/systemcfg", S_IFREG | 0444, NULL, + &page_map_proc_ops, vdso_data); + if (!pde) + return 1; + proc_set_size(pde, PAGE_SIZE); + + return 0; +} +__initcall(proc_ppc64_init); + +#endif /* CONFIG_PPC64 */ + +/* + * Create the ppc64 and ppc64/rtas directories early. This allows us to + * assume that they have been previously created in drivers. + */ +static int __init proc_ppc64_create(void) +{ + struct proc_dir_entry *root; + + root = proc_mkdir("powerpc", NULL); + if (!root) + return 1; + +#ifdef CONFIG_PPC64 + if (!proc_symlink("ppc64", NULL, "powerpc")) + pr_err("Failed to create link /proc/ppc64 -> /proc/powerpc\n"); +#endif + + if (!of_find_node_by_path("/rtas")) + return 0; + + if (!proc_mkdir("rtas", root)) + return 1; + + if (!proc_symlink("rtas", NULL, "powerpc/rtas")) + return 1; + + return 0; +} +core_initcall(proc_ppc64_create); diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c new file mode 100644 index 000000000..f2cbad522 --- /dev/null +++ b/arch/powerpc/kernel/process.c @@ -0,0 +1,2308 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Derived from "arch/i386/kernel/process.c" + * Copyright (C) 1995 Linus Torvalds + * + * Updated and modified by Cort Dougan (cort@cs.nmt.edu) and + * Paul Mackerras (paulus@cs.anu.edu.au) + * + * PowerPC version + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + */ + +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/sched/debug.h> +#include <linux/sched/task.h> +#include <linux/sched/task_stack.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/stddef.h> +#include <linux/unistd.h> +#include <linux/ptrace.h> +#include <linux/slab.h> +#include <linux/user.h> +#include <linux/elf.h> +#include <linux/prctl.h> +#include <linux/init_task.h> +#include <linux/export.h> +#include <linux/kallsyms.h> +#include <linux/mqueue.h> +#include <linux/hardirq.h> +#include <linux/utsname.h> +#include <linux/ftrace.h> +#include <linux/kernel_stat.h> +#include <linux/personality.h> +#include <linux/hw_breakpoint.h> +#include <linux/uaccess.h> +#include <linux/pkeys.h> +#include <linux/seq_buf.h> + +#include <asm/interrupt.h> +#include <asm/io.h> +#include <asm/processor.h> +#include <asm/mmu.h> +#include <asm/machdep.h> +#include <asm/time.h> +#include <asm/runlatch.h> +#include <asm/syscalls.h> +#include <asm/switch_to.h> +#include <asm/tm.h> +#include <asm/debug.h> +#ifdef CONFIG_PPC64 +#include <asm/firmware.h> +#include <asm/hw_irq.h> +#endif +#include <asm/code-patching.h> +#include <asm/exec.h> +#include <asm/livepatch.h> +#include <asm/cpu_has_feature.h> +#include <asm/asm-prototypes.h> +#include <asm/stacktrace.h> +#include <asm/hw_breakpoint.h> + +#include <linux/kprobes.h> +#include <linux/kdebug.h> + +/* Transactional Memory debug */ +#ifdef TM_DEBUG_SW +#define TM_DEBUG(x...) printk(KERN_INFO x) +#else +#define TM_DEBUG(x...) do { } while(0) +#endif + +extern unsigned long _get_SP(void); + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +/* + * Are we running in "Suspend disabled" mode? If so we have to block any + * sigreturn that would get us into suspended state, and we also warn in some + * other paths that we should never reach with suspend disabled. + */ +bool tm_suspend_disabled __ro_after_init = false; + +static void check_if_tm_restore_required(struct task_struct *tsk) +{ + /* + * If we are saving the current thread's registers, and the + * thread is in a transactional state, set the TIF_RESTORE_TM + * bit so that we know to restore the registers before + * returning to userspace. + */ + if (tsk == current && tsk->thread.regs && + MSR_TM_ACTIVE(tsk->thread.regs->msr) && + !test_thread_flag(TIF_RESTORE_TM)) { + regs_set_return_msr(&tsk->thread.ckpt_regs, + tsk->thread.regs->msr); + set_thread_flag(TIF_RESTORE_TM); + } +} + +#else +static inline void check_if_tm_restore_required(struct task_struct *tsk) { } +#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ + +bool strict_msr_control; +EXPORT_SYMBOL(strict_msr_control); + +static int __init enable_strict_msr_control(char *str) +{ + strict_msr_control = true; + pr_info("Enabling strict facility control\n"); + + return 0; +} +early_param("ppc_strict_facility_enable", enable_strict_msr_control); + +/* notrace because it's called by restore_math */ +unsigned long notrace msr_check_and_set(unsigned long bits) +{ + unsigned long oldmsr = mfmsr(); + unsigned long newmsr; + + newmsr = oldmsr | bits; + + if (cpu_has_feature(CPU_FTR_VSX) && (bits & MSR_FP)) + newmsr |= MSR_VSX; + + if (oldmsr != newmsr) + newmsr = mtmsr_isync_irqsafe(newmsr); + + return newmsr; +} +EXPORT_SYMBOL_GPL(msr_check_and_set); + +/* notrace because it's called by restore_math */ +void notrace __msr_check_and_clear(unsigned long bits) +{ + unsigned long oldmsr = mfmsr(); + unsigned long newmsr; + + newmsr = oldmsr & ~bits; + + if (cpu_has_feature(CPU_FTR_VSX) && (bits & MSR_FP)) + newmsr &= ~MSR_VSX; + + if (oldmsr != newmsr) + mtmsr_isync_irqsafe(newmsr); +} +EXPORT_SYMBOL(__msr_check_and_clear); + +#ifdef CONFIG_PPC_FPU +static void __giveup_fpu(struct task_struct *tsk) +{ + unsigned long msr; + + save_fpu(tsk); + msr = tsk->thread.regs->msr; + msr &= ~(MSR_FP|MSR_FE0|MSR_FE1); + if (cpu_has_feature(CPU_FTR_VSX)) + msr &= ~MSR_VSX; + regs_set_return_msr(tsk->thread.regs, msr); +} + +void giveup_fpu(struct task_struct *tsk) +{ + check_if_tm_restore_required(tsk); + + msr_check_and_set(MSR_FP); + __giveup_fpu(tsk); + msr_check_and_clear(MSR_FP); +} +EXPORT_SYMBOL(giveup_fpu); + +/* + * Make sure the floating-point register state in the + * the thread_struct is up to date for task tsk. + */ +void flush_fp_to_thread(struct task_struct *tsk) +{ + if (tsk->thread.regs) { + /* + * We need to disable preemption here because if we didn't, + * another process could get scheduled after the regs->msr + * test but before we have finished saving the FP registers + * to the thread_struct. That process could take over the + * FPU, and then when we get scheduled again we would store + * bogus values for the remaining FP registers. + */ + preempt_disable(); + if (tsk->thread.regs->msr & MSR_FP) { + /* + * This should only ever be called for current or + * for a stopped child process. Since we save away + * the FP register state on context switch, + * there is something wrong if a stopped child appears + * to still have its FP state in the CPU registers. + */ + BUG_ON(tsk != current); + giveup_fpu(tsk); + } + preempt_enable(); + } +} +EXPORT_SYMBOL_GPL(flush_fp_to_thread); + +void enable_kernel_fp(void) +{ + unsigned long cpumsr; + + WARN_ON(preemptible()); + + cpumsr = msr_check_and_set(MSR_FP); + + if (current->thread.regs && (current->thread.regs->msr & MSR_FP)) { + check_if_tm_restore_required(current); + /* + * If a thread has already been reclaimed then the + * checkpointed registers are on the CPU but have definitely + * been saved by the reclaim code. Don't need to and *cannot* + * giveup as this would save to the 'live' structure not the + * checkpointed structure. + */ + if (!MSR_TM_ACTIVE(cpumsr) && + MSR_TM_ACTIVE(current->thread.regs->msr)) + return; + __giveup_fpu(current); + } +} +EXPORT_SYMBOL(enable_kernel_fp); +#else +static inline void __giveup_fpu(struct task_struct *tsk) { } +#endif /* CONFIG_PPC_FPU */ + +#ifdef CONFIG_ALTIVEC +static void __giveup_altivec(struct task_struct *tsk) +{ + unsigned long msr; + + save_altivec(tsk); + msr = tsk->thread.regs->msr; + msr &= ~MSR_VEC; + if (cpu_has_feature(CPU_FTR_VSX)) + msr &= ~MSR_VSX; + regs_set_return_msr(tsk->thread.regs, msr); +} + +void giveup_altivec(struct task_struct *tsk) +{ + check_if_tm_restore_required(tsk); + + msr_check_and_set(MSR_VEC); + __giveup_altivec(tsk); + msr_check_and_clear(MSR_VEC); +} +EXPORT_SYMBOL(giveup_altivec); + +void enable_kernel_altivec(void) +{ + unsigned long cpumsr; + + WARN_ON(preemptible()); + + cpumsr = msr_check_and_set(MSR_VEC); + + if (current->thread.regs && (current->thread.regs->msr & MSR_VEC)) { + check_if_tm_restore_required(current); + /* + * If a thread has already been reclaimed then the + * checkpointed registers are on the CPU but have definitely + * been saved by the reclaim code. Don't need to and *cannot* + * giveup as this would save to the 'live' structure not the + * checkpointed structure. + */ + if (!MSR_TM_ACTIVE(cpumsr) && + MSR_TM_ACTIVE(current->thread.regs->msr)) + return; + __giveup_altivec(current); + } +} +EXPORT_SYMBOL(enable_kernel_altivec); + +/* + * Make sure the VMX/Altivec register state in the + * the thread_struct is up to date for task tsk. + */ +void flush_altivec_to_thread(struct task_struct *tsk) +{ + if (tsk->thread.regs) { + preempt_disable(); + if (tsk->thread.regs->msr & MSR_VEC) { + BUG_ON(tsk != current); + giveup_altivec(tsk); + } + preempt_enable(); + } +} +EXPORT_SYMBOL_GPL(flush_altivec_to_thread); +#endif /* CONFIG_ALTIVEC */ + +#ifdef CONFIG_VSX +static void __giveup_vsx(struct task_struct *tsk) +{ + unsigned long msr = tsk->thread.regs->msr; + + /* + * We should never be setting MSR_VSX without also setting + * MSR_FP and MSR_VEC + */ + WARN_ON((msr & MSR_VSX) && !((msr & MSR_FP) && (msr & MSR_VEC))); + + /* __giveup_fpu will clear MSR_VSX */ + if (msr & MSR_FP) + __giveup_fpu(tsk); + if (msr & MSR_VEC) + __giveup_altivec(tsk); +} + +static void giveup_vsx(struct task_struct *tsk) +{ + check_if_tm_restore_required(tsk); + + msr_check_and_set(MSR_FP|MSR_VEC|MSR_VSX); + __giveup_vsx(tsk); + msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX); +} + +void enable_kernel_vsx(void) +{ + unsigned long cpumsr; + + WARN_ON(preemptible()); + + cpumsr = msr_check_and_set(MSR_FP|MSR_VEC|MSR_VSX); + + if (current->thread.regs && + (current->thread.regs->msr & (MSR_VSX|MSR_VEC|MSR_FP))) { + check_if_tm_restore_required(current); + /* + * If a thread has already been reclaimed then the + * checkpointed registers are on the CPU but have definitely + * been saved by the reclaim code. Don't need to and *cannot* + * giveup as this would save to the 'live' structure not the + * checkpointed structure. + */ + if (!MSR_TM_ACTIVE(cpumsr) && + MSR_TM_ACTIVE(current->thread.regs->msr)) + return; + __giveup_vsx(current); + } +} +EXPORT_SYMBOL(enable_kernel_vsx); + +void flush_vsx_to_thread(struct task_struct *tsk) +{ + if (tsk->thread.regs) { + preempt_disable(); + if (tsk->thread.regs->msr & (MSR_VSX|MSR_VEC|MSR_FP)) { + BUG_ON(tsk != current); + giveup_vsx(tsk); + } + preempt_enable(); + } +} +EXPORT_SYMBOL_GPL(flush_vsx_to_thread); +#endif /* CONFIG_VSX */ + +#ifdef CONFIG_SPE +void giveup_spe(struct task_struct *tsk) +{ + check_if_tm_restore_required(tsk); + + msr_check_and_set(MSR_SPE); + __giveup_spe(tsk); + msr_check_and_clear(MSR_SPE); +} +EXPORT_SYMBOL(giveup_spe); + +void enable_kernel_spe(void) +{ + WARN_ON(preemptible()); + + msr_check_and_set(MSR_SPE); + + if (current->thread.regs && (current->thread.regs->msr & MSR_SPE)) { + check_if_tm_restore_required(current); + __giveup_spe(current); + } +} +EXPORT_SYMBOL(enable_kernel_spe); + +void flush_spe_to_thread(struct task_struct *tsk) +{ + if (tsk->thread.regs) { + preempt_disable(); + if (tsk->thread.regs->msr & MSR_SPE) { + BUG_ON(tsk != current); + tsk->thread.spefscr = mfspr(SPRN_SPEFSCR); + giveup_spe(tsk); + } + preempt_enable(); + } +} +#endif /* CONFIG_SPE */ + +static unsigned long msr_all_available; + +static int __init init_msr_all_available(void) +{ + if (IS_ENABLED(CONFIG_PPC_FPU)) + msr_all_available |= MSR_FP; + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + msr_all_available |= MSR_VEC; + if (cpu_has_feature(CPU_FTR_VSX)) + msr_all_available |= MSR_VSX; + if (cpu_has_feature(CPU_FTR_SPE)) + msr_all_available |= MSR_SPE; + + return 0; +} +early_initcall(init_msr_all_available); + +void giveup_all(struct task_struct *tsk) +{ + unsigned long usermsr; + + if (!tsk->thread.regs) + return; + + check_if_tm_restore_required(tsk); + + usermsr = tsk->thread.regs->msr; + + if ((usermsr & msr_all_available) == 0) + return; + + msr_check_and_set(msr_all_available); + + WARN_ON((usermsr & MSR_VSX) && !((usermsr & MSR_FP) && (usermsr & MSR_VEC))); + + if (usermsr & MSR_FP) + __giveup_fpu(tsk); + if (usermsr & MSR_VEC) + __giveup_altivec(tsk); + if (usermsr & MSR_SPE) + __giveup_spe(tsk); + + msr_check_and_clear(msr_all_available); +} +EXPORT_SYMBOL(giveup_all); + +#ifdef CONFIG_PPC_BOOK3S_64 +#ifdef CONFIG_PPC_FPU +static bool should_restore_fp(void) +{ + if (current->thread.load_fp) { + current->thread.load_fp++; + return true; + } + return false; +} + +static void do_restore_fp(void) +{ + load_fp_state(¤t->thread.fp_state); +} +#else +static bool should_restore_fp(void) { return false; } +static void do_restore_fp(void) { } +#endif /* CONFIG_PPC_FPU */ + +#ifdef CONFIG_ALTIVEC +static bool should_restore_altivec(void) +{ + if (cpu_has_feature(CPU_FTR_ALTIVEC) && (current->thread.load_vec)) { + current->thread.load_vec++; + return true; + } + return false; +} + +static void do_restore_altivec(void) +{ + load_vr_state(¤t->thread.vr_state); + current->thread.used_vr = 1; +} +#else +static bool should_restore_altivec(void) { return false; } +static void do_restore_altivec(void) { } +#endif /* CONFIG_ALTIVEC */ + +static bool should_restore_vsx(void) +{ + if (cpu_has_feature(CPU_FTR_VSX)) + return true; + return false; +} +#ifdef CONFIG_VSX +static void do_restore_vsx(void) +{ + current->thread.used_vsr = 1; +} +#else +static void do_restore_vsx(void) { } +#endif /* CONFIG_VSX */ + +/* + * The exception exit path calls restore_math() with interrupts hard disabled + * but the soft irq state not "reconciled". ftrace code that calls + * local_irq_save/restore causes warnings. + * + * Rather than complicate the exit path, just don't trace restore_math. This + * could be done by having ftrace entry code check for this un-reconciled + * condition where MSR[EE]=0 and PACA_IRQ_HARD_DIS is not set, and + * temporarily fix it up for the duration of the ftrace call. + */ +void notrace restore_math(struct pt_regs *regs) +{ + unsigned long msr; + unsigned long new_msr = 0; + + msr = regs->msr; + + /* + * new_msr tracks the facilities that are to be restored. Only reload + * if the bit is not set in the user MSR (if it is set, the registers + * are live for the user thread). + */ + if ((!(msr & MSR_FP)) && should_restore_fp()) + new_msr |= MSR_FP; + + if ((!(msr & MSR_VEC)) && should_restore_altivec()) + new_msr |= MSR_VEC; + + if ((!(msr & MSR_VSX)) && should_restore_vsx()) { + if (((msr | new_msr) & (MSR_FP | MSR_VEC)) == (MSR_FP | MSR_VEC)) + new_msr |= MSR_VSX; + } + + if (new_msr) { + unsigned long fpexc_mode = 0; + + msr_check_and_set(new_msr); + + if (new_msr & MSR_FP) { + do_restore_fp(); + + // This also covers VSX, because VSX implies FP + fpexc_mode = current->thread.fpexc_mode; + } + + if (new_msr & MSR_VEC) + do_restore_altivec(); + + if (new_msr & MSR_VSX) + do_restore_vsx(); + + msr_check_and_clear(new_msr); + + regs_set_return_msr(regs, regs->msr | new_msr | fpexc_mode); + } +} +#endif /* CONFIG_PPC_BOOK3S_64 */ + +static void save_all(struct task_struct *tsk) +{ + unsigned long usermsr; + + if (!tsk->thread.regs) + return; + + usermsr = tsk->thread.regs->msr; + + if ((usermsr & msr_all_available) == 0) + return; + + msr_check_and_set(msr_all_available); + + WARN_ON((usermsr & MSR_VSX) && !((usermsr & MSR_FP) && (usermsr & MSR_VEC))); + + if (usermsr & MSR_FP) + save_fpu(tsk); + + if (usermsr & MSR_VEC) + save_altivec(tsk); + + if (usermsr & MSR_SPE) + __giveup_spe(tsk); + + msr_check_and_clear(msr_all_available); +} + +void flush_all_to_thread(struct task_struct *tsk) +{ + if (tsk->thread.regs) { + preempt_disable(); + BUG_ON(tsk != current); +#ifdef CONFIG_SPE + if (tsk->thread.regs->msr & MSR_SPE) + tsk->thread.spefscr = mfspr(SPRN_SPEFSCR); +#endif + save_all(tsk); + + preempt_enable(); + } +} +EXPORT_SYMBOL(flush_all_to_thread); + +#ifdef CONFIG_PPC_ADV_DEBUG_REGS +void do_send_trap(struct pt_regs *regs, unsigned long address, + unsigned long error_code, int breakpt) +{ + current->thread.trap_nr = TRAP_HWBKPT; + if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code, + 11, SIGSEGV) == NOTIFY_STOP) + return; + + /* Deliver the signal to userspace */ + force_sig_ptrace_errno_trap(breakpt, /* breakpoint or watchpoint id */ + (void __user *)address); +} +#else /* !CONFIG_PPC_ADV_DEBUG_REGS */ + +static void do_break_handler(struct pt_regs *regs) +{ + struct arch_hw_breakpoint null_brk = {0}; + struct arch_hw_breakpoint *info; + ppc_inst_t instr = ppc_inst(0); + int type = 0; + int size = 0; + unsigned long ea; + int i; + + /* + * If underneath hw supports only one watchpoint, we know it + * caused exception. 8xx also falls into this category. + */ + if (nr_wp_slots() == 1) { + __set_breakpoint(0, &null_brk); + current->thread.hw_brk[0] = null_brk; + current->thread.hw_brk[0].flags |= HW_BRK_FLAG_DISABLED; + return; + } + + /* Otherwise find out which DAWR caused exception and disable it. */ + wp_get_instr_detail(regs, &instr, &type, &size, &ea); + + for (i = 0; i < nr_wp_slots(); i++) { + info = ¤t->thread.hw_brk[i]; + if (!info->address) + continue; + + if (wp_check_constraints(regs, instr, ea, type, size, info)) { + __set_breakpoint(i, &null_brk); + current->thread.hw_brk[i] = null_brk; + current->thread.hw_brk[i].flags |= HW_BRK_FLAG_DISABLED; + } + } +} + +DEFINE_INTERRUPT_HANDLER(do_break) +{ + current->thread.trap_nr = TRAP_HWBKPT; + if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, regs->dsisr, + 11, SIGSEGV) == NOTIFY_STOP) + return; + + if (debugger_break_match(regs)) + return; + + /* + * We reach here only when watchpoint exception is generated by ptrace + * event (or hw is buggy!). Now if CONFIG_HAVE_HW_BREAKPOINT is set, + * watchpoint is already handled by hw_breakpoint_handler() so we don't + * have to do anything. But when CONFIG_HAVE_HW_BREAKPOINT is not set, + * we need to manually handle the watchpoint here. + */ + if (!IS_ENABLED(CONFIG_HAVE_HW_BREAKPOINT)) + do_break_handler(regs); + + /* Deliver the signal to userspace */ + force_sig_fault(SIGTRAP, TRAP_HWBKPT, (void __user *)regs->dar); +} +#endif /* CONFIG_PPC_ADV_DEBUG_REGS */ + +static DEFINE_PER_CPU(struct arch_hw_breakpoint, current_brk[HBP_NUM_MAX]); + +#ifdef CONFIG_PPC_ADV_DEBUG_REGS +/* + * Set the debug registers back to their default "safe" values. + */ +static void set_debug_reg_defaults(struct thread_struct *thread) +{ + thread->debug.iac1 = thread->debug.iac2 = 0; +#if CONFIG_PPC_ADV_DEBUG_IACS > 2 + thread->debug.iac3 = thread->debug.iac4 = 0; +#endif + thread->debug.dac1 = thread->debug.dac2 = 0; +#if CONFIG_PPC_ADV_DEBUG_DVCS > 0 + thread->debug.dvc1 = thread->debug.dvc2 = 0; +#endif + thread->debug.dbcr0 = 0; +#ifdef CONFIG_BOOKE + /* + * Force User/Supervisor bits to b11 (user-only MSR[PR]=1) + */ + thread->debug.dbcr1 = DBCR1_IAC1US | DBCR1_IAC2US | + DBCR1_IAC3US | DBCR1_IAC4US; + /* + * Force Data Address Compare User/Supervisor bits to be User-only + * (0b11 MSR[PR]=1) and set all other bits in DBCR2 register to be 0. + */ + thread->debug.dbcr2 = DBCR2_DAC1US | DBCR2_DAC2US; +#else + thread->debug.dbcr1 = 0; +#endif +} + +static void prime_debug_regs(struct debug_reg *debug) +{ + /* + * We could have inherited MSR_DE from userspace, since + * it doesn't get cleared on exception entry. Make sure + * MSR_DE is clear before we enable any debug events. + */ + mtmsr(mfmsr() & ~MSR_DE); + + mtspr(SPRN_IAC1, debug->iac1); + mtspr(SPRN_IAC2, debug->iac2); +#if CONFIG_PPC_ADV_DEBUG_IACS > 2 + mtspr(SPRN_IAC3, debug->iac3); + mtspr(SPRN_IAC4, debug->iac4); +#endif + mtspr(SPRN_DAC1, debug->dac1); + mtspr(SPRN_DAC2, debug->dac2); +#if CONFIG_PPC_ADV_DEBUG_DVCS > 0 + mtspr(SPRN_DVC1, debug->dvc1); + mtspr(SPRN_DVC2, debug->dvc2); +#endif + mtspr(SPRN_DBCR0, debug->dbcr0); + mtspr(SPRN_DBCR1, debug->dbcr1); +#ifdef CONFIG_BOOKE + mtspr(SPRN_DBCR2, debug->dbcr2); +#endif +} +/* + * Unless neither the old or new thread are making use of the + * debug registers, set the debug registers from the values + * stored in the new thread. + */ +void switch_booke_debug_regs(struct debug_reg *new_debug) +{ + if ((current->thread.debug.dbcr0 & DBCR0_IDM) + || (new_debug->dbcr0 & DBCR0_IDM)) + prime_debug_regs(new_debug); +} +EXPORT_SYMBOL_GPL(switch_booke_debug_regs); +#else /* !CONFIG_PPC_ADV_DEBUG_REGS */ +#ifndef CONFIG_HAVE_HW_BREAKPOINT +static void set_breakpoint(int i, struct arch_hw_breakpoint *brk) +{ + preempt_disable(); + __set_breakpoint(i, brk); + preempt_enable(); +} + +static void set_debug_reg_defaults(struct thread_struct *thread) +{ + int i; + struct arch_hw_breakpoint null_brk = {0}; + + for (i = 0; i < nr_wp_slots(); i++) { + thread->hw_brk[i] = null_brk; + if (ppc_breakpoint_available()) + set_breakpoint(i, &thread->hw_brk[i]); + } +} + +static inline bool hw_brk_match(struct arch_hw_breakpoint *a, + struct arch_hw_breakpoint *b) +{ + if (a->address != b->address) + return false; + if (a->type != b->type) + return false; + if (a->len != b->len) + return false; + /* no need to check hw_len. it's calculated from address and len */ + return true; +} + +static void switch_hw_breakpoint(struct task_struct *new) +{ + int i; + + for (i = 0; i < nr_wp_slots(); i++) { + if (likely(hw_brk_match(this_cpu_ptr(¤t_brk[i]), + &new->thread.hw_brk[i]))) + continue; + + __set_breakpoint(i, &new->thread.hw_brk[i]); + } +} +#endif /* !CONFIG_HAVE_HW_BREAKPOINT */ +#endif /* CONFIG_PPC_ADV_DEBUG_REGS */ + +static inline int set_dabr(struct arch_hw_breakpoint *brk) +{ + unsigned long dabr, dabrx; + + dabr = brk->address | (brk->type & HW_BRK_TYPE_DABR); + dabrx = ((brk->type >> 3) & 0x7); + + if (ppc_md.set_dabr) + return ppc_md.set_dabr(dabr, dabrx); + + if (IS_ENABLED(CONFIG_PPC_ADV_DEBUG_REGS)) { + mtspr(SPRN_DAC1, dabr); + if (IS_ENABLED(CONFIG_PPC_47x)) + isync(); + return 0; + } else if (IS_ENABLED(CONFIG_PPC_BOOK3S)) { + mtspr(SPRN_DABR, dabr); + if (cpu_has_feature(CPU_FTR_DABRX)) + mtspr(SPRN_DABRX, dabrx); + return 0; + } else { + return -EINVAL; + } +} + +static inline int set_breakpoint_8xx(struct arch_hw_breakpoint *brk) +{ + unsigned long lctrl1 = LCTRL1_CTE_GT | LCTRL1_CTF_LT | LCTRL1_CRWE_RW | + LCTRL1_CRWF_RW; + unsigned long lctrl2 = LCTRL2_LW0EN | LCTRL2_LW0LADC | LCTRL2_SLW0EN; + unsigned long start_addr = ALIGN_DOWN(brk->address, HW_BREAKPOINT_SIZE); + unsigned long end_addr = ALIGN(brk->address + brk->len, HW_BREAKPOINT_SIZE); + + if (start_addr == 0) + lctrl2 |= LCTRL2_LW0LA_F; + else if (end_addr == 0) + lctrl2 |= LCTRL2_LW0LA_E; + else + lctrl2 |= LCTRL2_LW0LA_EandF; + + mtspr(SPRN_LCTRL2, 0); + + if ((brk->type & HW_BRK_TYPE_RDWR) == 0) + return 0; + + if ((brk->type & HW_BRK_TYPE_RDWR) == HW_BRK_TYPE_READ) + lctrl1 |= LCTRL1_CRWE_RO | LCTRL1_CRWF_RO; + if ((brk->type & HW_BRK_TYPE_RDWR) == HW_BRK_TYPE_WRITE) + lctrl1 |= LCTRL1_CRWE_WO | LCTRL1_CRWF_WO; + + mtspr(SPRN_CMPE, start_addr - 1); + mtspr(SPRN_CMPF, end_addr); + mtspr(SPRN_LCTRL1, lctrl1); + mtspr(SPRN_LCTRL2, lctrl2); + + return 0; +} + +void __set_breakpoint(int nr, struct arch_hw_breakpoint *brk) +{ + memcpy(this_cpu_ptr(¤t_brk[nr]), brk, sizeof(*brk)); + + if (dawr_enabled()) + // Power8 or later + set_dawr(nr, brk); + else if (IS_ENABLED(CONFIG_PPC_8xx)) + set_breakpoint_8xx(brk); + else if (!cpu_has_feature(CPU_FTR_ARCH_207S)) + // Power7 or earlier + set_dabr(brk); + else + // Shouldn't happen due to higher level checks + WARN_ON_ONCE(1); +} + +/* Check if we have DAWR or DABR hardware */ +bool ppc_breakpoint_available(void) +{ + if (dawr_enabled()) + return true; /* POWER8 DAWR or POWER9 forced DAWR */ + if (cpu_has_feature(CPU_FTR_ARCH_207S)) + return false; /* POWER9 with DAWR disabled */ + /* DABR: Everything but POWER8 and POWER9 */ + return true; +} +EXPORT_SYMBOL_GPL(ppc_breakpoint_available); + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + +static inline bool tm_enabled(struct task_struct *tsk) +{ + return tsk && tsk->thread.regs && (tsk->thread.regs->msr & MSR_TM); +} + +static void tm_reclaim_thread(struct thread_struct *thr, uint8_t cause) +{ + /* + * Use the current MSR TM suspended bit to track if we have + * checkpointed state outstanding. + * On signal delivery, we'd normally reclaim the checkpointed + * state to obtain stack pointer (see:get_tm_stackpointer()). + * This will then directly return to userspace without going + * through __switch_to(). However, if the stack frame is bad, + * we need to exit this thread which calls __switch_to() which + * will again attempt to reclaim the already saved tm state. + * Hence we need to check that we've not already reclaimed + * this state. + * We do this using the current MSR, rather tracking it in + * some specific thread_struct bit, as it has the additional + * benefit of checking for a potential TM bad thing exception. + */ + if (!MSR_TM_SUSPENDED(mfmsr())) + return; + + giveup_all(container_of(thr, struct task_struct, thread)); + + tm_reclaim(thr, cause); + + /* + * If we are in a transaction and FP is off then we can't have + * used FP inside that transaction. Hence the checkpointed + * state is the same as the live state. We need to copy the + * live state to the checkpointed state so that when the + * transaction is restored, the checkpointed state is correct + * and the aborted transaction sees the correct state. We use + * ckpt_regs.msr here as that's what tm_reclaim will use to + * determine if it's going to write the checkpointed state or + * not. So either this will write the checkpointed registers, + * or reclaim will. Similarly for VMX. + */ + if ((thr->ckpt_regs.msr & MSR_FP) == 0) + memcpy(&thr->ckfp_state, &thr->fp_state, + sizeof(struct thread_fp_state)); + if ((thr->ckpt_regs.msr & MSR_VEC) == 0) + memcpy(&thr->ckvr_state, &thr->vr_state, + sizeof(struct thread_vr_state)); +} + +void tm_reclaim_current(uint8_t cause) +{ + tm_enable(); + tm_reclaim_thread(¤t->thread, cause); +} + +static inline void tm_reclaim_task(struct task_struct *tsk) +{ + /* We have to work out if we're switching from/to a task that's in the + * middle of a transaction. + * + * In switching we need to maintain a 2nd register state as + * oldtask->thread.ckpt_regs. We tm_reclaim(oldproc); this saves the + * checkpointed (tbegin) state in ckpt_regs, ckfp_state and + * ckvr_state + * + * We also context switch (save) TFHAR/TEXASR/TFIAR in here. + */ + struct thread_struct *thr = &tsk->thread; + + if (!thr->regs) + return; + + if (!MSR_TM_ACTIVE(thr->regs->msr)) + goto out_and_saveregs; + + WARN_ON(tm_suspend_disabled); + + TM_DEBUG("--- tm_reclaim on pid %d (NIP=%lx, " + "ccr=%lx, msr=%lx, trap=%lx)\n", + tsk->pid, thr->regs->nip, + thr->regs->ccr, thr->regs->msr, + thr->regs->trap); + + tm_reclaim_thread(thr, TM_CAUSE_RESCHED); + + TM_DEBUG("--- tm_reclaim on pid %d complete\n", + tsk->pid); + +out_and_saveregs: + /* Always save the regs here, even if a transaction's not active. + * This context-switches a thread's TM info SPRs. We do it here to + * be consistent with the restore path (in recheckpoint) which + * cannot happen later in _switch(). + */ + tm_save_sprs(thr); +} + +extern void __tm_recheckpoint(struct thread_struct *thread); + +void tm_recheckpoint(struct thread_struct *thread) +{ + unsigned long flags; + + if (!(thread->regs->msr & MSR_TM)) + return; + + /* We really can't be interrupted here as the TEXASR registers can't + * change and later in the trecheckpoint code, we have a userspace R1. + * So let's hard disable over this region. + */ + local_irq_save(flags); + hard_irq_disable(); + + /* The TM SPRs are restored here, so that TEXASR.FS can be set + * before the trecheckpoint and no explosion occurs. + */ + tm_restore_sprs(thread); + + __tm_recheckpoint(thread); + + local_irq_restore(flags); +} + +static inline void tm_recheckpoint_new_task(struct task_struct *new) +{ + if (!cpu_has_feature(CPU_FTR_TM)) + return; + + /* Recheckpoint the registers of the thread we're about to switch to. + * + * If the task was using FP, we non-lazily reload both the original and + * the speculative FP register states. This is because the kernel + * doesn't see if/when a TM rollback occurs, so if we take an FP + * unavailable later, we are unable to determine which set of FP regs + * need to be restored. + */ + if (!tm_enabled(new)) + return; + + if (!MSR_TM_ACTIVE(new->thread.regs->msr)){ + tm_restore_sprs(&new->thread); + return; + } + /* Recheckpoint to restore original checkpointed register state. */ + TM_DEBUG("*** tm_recheckpoint of pid %d (new->msr 0x%lx)\n", + new->pid, new->thread.regs->msr); + + tm_recheckpoint(&new->thread); + + /* + * The checkpointed state has been restored but the live state has + * not, ensure all the math functionality is turned off to trigger + * restore_math() to reload. + */ + new->thread.regs->msr &= ~(MSR_FP | MSR_VEC | MSR_VSX); + + TM_DEBUG("*** tm_recheckpoint of pid %d complete " + "(kernel msr 0x%lx)\n", + new->pid, mfmsr()); +} + +static inline void __switch_to_tm(struct task_struct *prev, + struct task_struct *new) +{ + if (cpu_has_feature(CPU_FTR_TM)) { + if (tm_enabled(prev) || tm_enabled(new)) + tm_enable(); + + if (tm_enabled(prev)) { + prev->thread.load_tm++; + tm_reclaim_task(prev); + if (!MSR_TM_ACTIVE(prev->thread.regs->msr) && prev->thread.load_tm == 0) + prev->thread.regs->msr &= ~MSR_TM; + } + + tm_recheckpoint_new_task(new); + } +} + +/* + * This is called if we are on the way out to userspace and the + * TIF_RESTORE_TM flag is set. It checks if we need to reload + * FP and/or vector state and does so if necessary. + * If userspace is inside a transaction (whether active or + * suspended) and FP/VMX/VSX instructions have ever been enabled + * inside that transaction, then we have to keep them enabled + * and keep the FP/VMX/VSX state loaded while ever the transaction + * continues. The reason is that if we didn't, and subsequently + * got a FP/VMX/VSX unavailable interrupt inside a transaction, + * we don't know whether it's the same transaction, and thus we + * don't know which of the checkpointed state and the transactional + * state to use. + */ +void restore_tm_state(struct pt_regs *regs) +{ + unsigned long msr_diff; + + /* + * This is the only moment we should clear TIF_RESTORE_TM as + * it is here that ckpt_regs.msr and pt_regs.msr become the same + * again, anything else could lead to an incorrect ckpt_msr being + * saved and therefore incorrect signal contexts. + */ + clear_thread_flag(TIF_RESTORE_TM); + if (!MSR_TM_ACTIVE(regs->msr)) + return; + + msr_diff = current->thread.ckpt_regs.msr & ~regs->msr; + msr_diff &= MSR_FP | MSR_VEC | MSR_VSX; + + /* Ensure that restore_math() will restore */ + if (msr_diff & MSR_FP) + current->thread.load_fp = 1; +#ifdef CONFIG_ALTIVEC + if (cpu_has_feature(CPU_FTR_ALTIVEC) && msr_diff & MSR_VEC) + current->thread.load_vec = 1; +#endif + restore_math(regs); + + regs_set_return_msr(regs, regs->msr | msr_diff); +} + +#else /* !CONFIG_PPC_TRANSACTIONAL_MEM */ +#define tm_recheckpoint_new_task(new) +#define __switch_to_tm(prev, new) +void tm_reclaim_current(uint8_t cause) {} +#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ + +static inline void save_sprs(struct thread_struct *t) +{ +#ifdef CONFIG_ALTIVEC + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + t->vrsave = mfspr(SPRN_VRSAVE); +#endif +#ifdef CONFIG_SPE + if (cpu_has_feature(CPU_FTR_SPE)) + t->spefscr = mfspr(SPRN_SPEFSCR); +#endif +#ifdef CONFIG_PPC_BOOK3S_64 + if (cpu_has_feature(CPU_FTR_DSCR)) + t->dscr = mfspr(SPRN_DSCR); + + if (cpu_has_feature(CPU_FTR_ARCH_207S)) { + t->bescr = mfspr(SPRN_BESCR); + t->ebbhr = mfspr(SPRN_EBBHR); + t->ebbrr = mfspr(SPRN_EBBRR); + + t->fscr = mfspr(SPRN_FSCR); + + /* + * Note that the TAR is not available for use in the kernel. + * (To provide this, the TAR should be backed up/restored on + * exception entry/exit instead, and be in pt_regs. FIXME, + * this should be in pt_regs anyway (for debug).) + */ + t->tar = mfspr(SPRN_TAR); + } +#endif +} + +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE +void kvmppc_save_user_regs(void) +{ + unsigned long usermsr; + + if (!current->thread.regs) + return; + + usermsr = current->thread.regs->msr; + + /* Caller has enabled FP/VEC/VSX/TM in MSR */ + if (usermsr & MSR_FP) + __giveup_fpu(current); + if (usermsr & MSR_VEC) + __giveup_altivec(current); + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + if (usermsr & MSR_TM) { + current->thread.tm_tfhar = mfspr(SPRN_TFHAR); + current->thread.tm_tfiar = mfspr(SPRN_TFIAR); + current->thread.tm_texasr = mfspr(SPRN_TEXASR); + current->thread.regs->msr &= ~MSR_TM; + } +#endif +} +EXPORT_SYMBOL_GPL(kvmppc_save_user_regs); + +void kvmppc_save_current_sprs(void) +{ + save_sprs(¤t->thread); +} +EXPORT_SYMBOL_GPL(kvmppc_save_current_sprs); +#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */ + +static inline void restore_sprs(struct thread_struct *old_thread, + struct thread_struct *new_thread) +{ +#ifdef CONFIG_ALTIVEC + if (cpu_has_feature(CPU_FTR_ALTIVEC) && + old_thread->vrsave != new_thread->vrsave) + mtspr(SPRN_VRSAVE, new_thread->vrsave); +#endif +#ifdef CONFIG_SPE + if (cpu_has_feature(CPU_FTR_SPE) && + old_thread->spefscr != new_thread->spefscr) + mtspr(SPRN_SPEFSCR, new_thread->spefscr); +#endif +#ifdef CONFIG_PPC_BOOK3S_64 + if (cpu_has_feature(CPU_FTR_DSCR)) { + u64 dscr = get_paca()->dscr_default; + if (new_thread->dscr_inherit) + dscr = new_thread->dscr; + + if (old_thread->dscr != dscr) + mtspr(SPRN_DSCR, dscr); + } + + if (cpu_has_feature(CPU_FTR_ARCH_207S)) { + if (old_thread->bescr != new_thread->bescr) + mtspr(SPRN_BESCR, new_thread->bescr); + if (old_thread->ebbhr != new_thread->ebbhr) + mtspr(SPRN_EBBHR, new_thread->ebbhr); + if (old_thread->ebbrr != new_thread->ebbrr) + mtspr(SPRN_EBBRR, new_thread->ebbrr); + + if (old_thread->fscr != new_thread->fscr) + mtspr(SPRN_FSCR, new_thread->fscr); + + if (old_thread->tar != new_thread->tar) + mtspr(SPRN_TAR, new_thread->tar); + } + + if (cpu_has_feature(CPU_FTR_P9_TIDR) && + old_thread->tidr != new_thread->tidr) + mtspr(SPRN_TIDR, new_thread->tidr); +#endif + +} + +struct task_struct *__switch_to(struct task_struct *prev, + struct task_struct *new) +{ + struct thread_struct *new_thread, *old_thread; + struct task_struct *last; +#ifdef CONFIG_PPC_64S_HASH_MMU + struct ppc64_tlb_batch *batch; +#endif + + new_thread = &new->thread; + old_thread = ¤t->thread; + + WARN_ON(!irqs_disabled()); + +#ifdef CONFIG_PPC_64S_HASH_MMU + batch = this_cpu_ptr(&ppc64_tlb_batch); + if (batch->active) { + current_thread_info()->local_flags |= _TLF_LAZY_MMU; + if (batch->index) + __flush_tlb_pending(batch); + batch->active = 0; + } + + /* + * On POWER9 the copy-paste buffer can only paste into + * foreign real addresses, so unprivileged processes can not + * see the data or use it in any way unless they have + * foreign real mappings. If the new process has the foreign + * real address mappings, we must issue a cp_abort to clear + * any state and prevent snooping, corruption or a covert + * channel. ISA v3.1 supports paste into local memory. + */ + if (new->mm && (cpu_has_feature(CPU_FTR_ARCH_31) || + atomic_read(&new->mm->context.vas_windows))) + asm volatile(PPC_CP_ABORT); +#endif /* CONFIG_PPC_BOOK3S_64 */ + +#ifdef CONFIG_PPC_ADV_DEBUG_REGS + switch_booke_debug_regs(&new->thread.debug); +#else +/* + * For PPC_BOOK3S_64, we use the hw-breakpoint interfaces that would + * schedule DABR + */ +#ifndef CONFIG_HAVE_HW_BREAKPOINT + switch_hw_breakpoint(new); +#endif /* CONFIG_HAVE_HW_BREAKPOINT */ +#endif + + /* + * We need to save SPRs before treclaim/trecheckpoint as these will + * change a number of them. + */ + save_sprs(&prev->thread); + + /* Save FPU, Altivec, VSX and SPE state */ + giveup_all(prev); + + __switch_to_tm(prev, new); + + if (!radix_enabled()) { + /* + * We can't take a PMU exception inside _switch() since there + * is a window where the kernel stack SLB and the kernel stack + * are out of sync. Hard disable here. + */ + hard_irq_disable(); + } + + /* + * Call restore_sprs() and set_return_regs_changed() before calling + * _switch(). If we move it after _switch() then we miss out on calling + * it for new tasks. The reason for this is we manually create a stack + * frame for new tasks that directly returns through ret_from_fork() or + * ret_from_kernel_thread(). See copy_thread() for details. + */ + restore_sprs(old_thread, new_thread); + + set_return_regs_changed(); /* _switch changes stack (and regs) */ + + if (!IS_ENABLED(CONFIG_PPC_BOOK3S_64)) + kuap_assert_locked(); + + last = _switch(old_thread, new_thread); + + /* + * Nothing after _switch will be run for newly created tasks, + * because they switch directly to ret_from_fork/ret_from_kernel_thread + * etc. Code added here should have a comment explaining why that is + * okay. + */ + +#ifdef CONFIG_PPC_BOOK3S_64 +#ifdef CONFIG_PPC_64S_HASH_MMU + /* + * This applies to a process that was context switched while inside + * arch_enter_lazy_mmu_mode(), to re-activate the batch that was + * deactivated above, before _switch(). This will never be the case + * for new tasks. + */ + if (current_thread_info()->local_flags & _TLF_LAZY_MMU) { + current_thread_info()->local_flags &= ~_TLF_LAZY_MMU; + batch = this_cpu_ptr(&ppc64_tlb_batch); + batch->active = 1; + } +#endif + + /* + * Math facilities are masked out of the child MSR in copy_thread. + * A new task does not need to restore_math because it will + * demand fault them. + */ + if (current->thread.regs) + restore_math(current->thread.regs); +#endif /* CONFIG_PPC_BOOK3S_64 */ + + return last; +} + +#define NR_INSN_TO_PRINT 16 + +static void show_instructions(struct pt_regs *regs) +{ + int i; + unsigned long nip = regs->nip; + unsigned long pc = regs->nip - (NR_INSN_TO_PRINT * 3 / 4 * sizeof(int)); + + printk("Instruction dump:"); + + /* + * If we were executing with the MMU off for instructions, adjust pc + * rather than printing XXXXXXXX. + */ + if (!IS_ENABLED(CONFIG_BOOKE) && !(regs->msr & MSR_IR)) { + pc = (unsigned long)phys_to_virt(pc); + nip = (unsigned long)phys_to_virt(regs->nip); + } + + for (i = 0; i < NR_INSN_TO_PRINT; i++) { + int instr; + + if (!(i % 8)) + pr_cont("\n"); + + if (!__kernel_text_address(pc) || + get_kernel_nofault(instr, (const void *)pc)) { + pr_cont("XXXXXXXX "); + } else { + if (nip == pc) + pr_cont("<%08x> ", instr); + else + pr_cont("%08x ", instr); + } + + pc += sizeof(int); + } + + pr_cont("\n"); +} + +void show_user_instructions(struct pt_regs *regs) +{ + unsigned long pc; + int n = NR_INSN_TO_PRINT; + struct seq_buf s; + char buf[96]; /* enough for 8 times 9 + 2 chars */ + + pc = regs->nip - (NR_INSN_TO_PRINT * 3 / 4 * sizeof(int)); + + seq_buf_init(&s, buf, sizeof(buf)); + + while (n) { + int i; + + seq_buf_clear(&s); + + for (i = 0; i < 8 && n; i++, n--, pc += sizeof(int)) { + int instr; + + if (copy_from_user_nofault(&instr, (void __user *)pc, + sizeof(instr))) { + seq_buf_printf(&s, "XXXXXXXX "); + continue; + } + seq_buf_printf(&s, regs->nip == pc ? "<%08x> " : "%08x ", instr); + } + + if (!seq_buf_has_overflowed(&s)) + pr_info("%s[%d]: code: %s\n", current->comm, + current->pid, s.buffer); + } +} + +struct regbit { + unsigned long bit; + const char *name; +}; + +static struct regbit msr_bits[] = { +#if defined(CONFIG_PPC64) && !defined(CONFIG_BOOKE) + {MSR_SF, "SF"}, + {MSR_HV, "HV"}, +#endif + {MSR_VEC, "VEC"}, + {MSR_VSX, "VSX"}, +#ifdef CONFIG_BOOKE + {MSR_CE, "CE"}, +#endif + {MSR_EE, "EE"}, + {MSR_PR, "PR"}, + {MSR_FP, "FP"}, + {MSR_ME, "ME"}, +#ifdef CONFIG_BOOKE + {MSR_DE, "DE"}, +#else + {MSR_SE, "SE"}, + {MSR_BE, "BE"}, +#endif + {MSR_IR, "IR"}, + {MSR_DR, "DR"}, + {MSR_PMM, "PMM"}, +#ifndef CONFIG_BOOKE + {MSR_RI, "RI"}, + {MSR_LE, "LE"}, +#endif + {0, NULL} +}; + +static void print_bits(unsigned long val, struct regbit *bits, const char *sep) +{ + const char *s = ""; + + for (; bits->bit; ++bits) + if (val & bits->bit) { + pr_cont("%s%s", s, bits->name); + s = sep; + } +} + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +static struct regbit msr_tm_bits[] = { + {MSR_TS_T, "T"}, + {MSR_TS_S, "S"}, + {MSR_TM, "E"}, + {0, NULL} +}; + +static void print_tm_bits(unsigned long val) +{ +/* + * This only prints something if at least one of the TM bit is set. + * Inside the TM[], the output means: + * E: Enabled (bit 32) + * S: Suspended (bit 33) + * T: Transactional (bit 34) + */ + if (val & (MSR_TM | MSR_TS_S | MSR_TS_T)) { + pr_cont(",TM["); + print_bits(val, msr_tm_bits, ""); + pr_cont("]"); + } +} +#else +static void print_tm_bits(unsigned long val) {} +#endif + +static void print_msr_bits(unsigned long val) +{ + pr_cont("<"); + print_bits(val, msr_bits, ","); + print_tm_bits(val); + pr_cont(">"); +} + +#ifdef CONFIG_PPC64 +#define REG "%016lx" +#define REGS_PER_LINE 4 +#else +#define REG "%08lx" +#define REGS_PER_LINE 8 +#endif + +static void __show_regs(struct pt_regs *regs) +{ + int i, trap; + + printk("NIP: "REG" LR: "REG" CTR: "REG"\n", + regs->nip, regs->link, regs->ctr); + printk("REGS: %px TRAP: %04lx %s (%s)\n", + regs, regs->trap, print_tainted(), init_utsname()->release); + printk("MSR: "REG" ", regs->msr); + print_msr_bits(regs->msr); + pr_cont(" CR: %08lx XER: %08lx\n", regs->ccr, regs->xer); + trap = TRAP(regs); + if (!trap_is_syscall(regs) && cpu_has_feature(CPU_FTR_CFAR)) + pr_cont("CFAR: "REG" ", regs->orig_gpr3); + if (trap == INTERRUPT_MACHINE_CHECK || + trap == INTERRUPT_DATA_STORAGE || + trap == INTERRUPT_ALIGNMENT) { + if (IS_ENABLED(CONFIG_4xx) || IS_ENABLED(CONFIG_BOOKE)) + pr_cont("DEAR: "REG" ESR: "REG" ", regs->dear, regs->esr); + else + pr_cont("DAR: "REG" DSISR: %08lx ", regs->dar, regs->dsisr); + } + +#ifdef CONFIG_PPC64 + pr_cont("IRQMASK: %lx ", regs->softe); +#endif +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + if (MSR_TM_ACTIVE(regs->msr)) + pr_cont("\nPACATMSCRATCH: %016llx ", get_paca()->tm_scratch); +#endif + + for (i = 0; i < 32; i++) { + if ((i % REGS_PER_LINE) == 0) + pr_cont("\nGPR%02d: ", i); + pr_cont(REG " ", regs->gpr[i]); + } + pr_cont("\n"); + /* + * Lookup NIP late so we have the best change of getting the + * above info out without failing + */ + if (IS_ENABLED(CONFIG_KALLSYMS)) { + printk("NIP ["REG"] %pS\n", regs->nip, (void *)regs->nip); + printk("LR ["REG"] %pS\n", regs->link, (void *)regs->link); + } +} + +void show_regs(struct pt_regs *regs) +{ + show_regs_print_info(KERN_DEFAULT); + __show_regs(regs); + show_stack(current, (unsigned long *) regs->gpr[1], KERN_DEFAULT); + if (!user_mode(regs)) + show_instructions(regs); +} + +void flush_thread(void) +{ +#ifdef CONFIG_HAVE_HW_BREAKPOINT + flush_ptrace_hw_breakpoint(current); +#else /* CONFIG_HAVE_HW_BREAKPOINT */ + set_debug_reg_defaults(¤t->thread); +#endif /* CONFIG_HAVE_HW_BREAKPOINT */ +} + +void arch_setup_new_exec(void) +{ + +#ifdef CONFIG_PPC_BOOK3S_64 + if (!radix_enabled()) + hash__setup_new_exec(); +#endif + /* + * If we exec out of a kernel thread then thread.regs will not be + * set. Do it now. + */ + if (!current->thread.regs) { + struct pt_regs *regs = task_stack_page(current) + THREAD_SIZE; + current->thread.regs = regs - 1; + } + +#ifdef CONFIG_PPC_MEM_KEYS + current->thread.regs->amr = default_amr; + current->thread.regs->iamr = default_iamr; +#endif +} + +#ifdef CONFIG_PPC64 +/** + * Assign a TIDR (thread ID) for task @t and set it in the thread + * structure. For now, we only support setting TIDR for 'current' task. + * + * Since the TID value is a truncated form of it PID, it is possible + * (but unlikely) for 2 threads to have the same TID. In the unlikely event + * that 2 threads share the same TID and are waiting, one of the following + * cases will happen: + * + * 1. The correct thread is running, the wrong thread is not + * In this situation, the correct thread is woken and proceeds to pass it's + * condition check. + * + * 2. Neither threads are running + * In this situation, neither thread will be woken. When scheduled, the waiting + * threads will execute either a wait, which will return immediately, followed + * by a condition check, which will pass for the correct thread and fail + * for the wrong thread, or they will execute the condition check immediately. + * + * 3. The wrong thread is running, the correct thread is not + * The wrong thread will be woken, but will fail it's condition check and + * re-execute wait. The correct thread, when scheduled, will execute either + * it's condition check (which will pass), or wait, which returns immediately + * when called the first time after the thread is scheduled, followed by it's + * condition check (which will pass). + * + * 4. Both threads are running + * Both threads will be woken. The wrong thread will fail it's condition check + * and execute another wait, while the correct thread will pass it's condition + * check. + * + * @t: the task to set the thread ID for + */ +int set_thread_tidr(struct task_struct *t) +{ + if (!cpu_has_feature(CPU_FTR_P9_TIDR)) + return -EINVAL; + + if (t != current) + return -EINVAL; + + if (t->thread.tidr) + return 0; + + t->thread.tidr = (u16)task_pid_nr(t); + mtspr(SPRN_TIDR, t->thread.tidr); + + return 0; +} +EXPORT_SYMBOL_GPL(set_thread_tidr); + +#endif /* CONFIG_PPC64 */ + +/* + * this gets called so that we can store coprocessor state into memory and + * copy the current task into the new thread. + */ +int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) +{ + flush_all_to_thread(src); + /* + * Flush TM state out so we can copy it. __switch_to_tm() does this + * flush but it removes the checkpointed state from the current CPU and + * transitions the CPU out of TM mode. Hence we need to call + * tm_recheckpoint_new_task() (on the same task) to restore the + * checkpointed state back and the TM mode. + * + * Can't pass dst because it isn't ready. Doesn't matter, passing + * dst is only important for __switch_to() + */ + __switch_to_tm(src, src); + + *dst = *src; + + clear_task_ebb(dst); + + return 0; +} + +static void setup_ksp_vsid(struct task_struct *p, unsigned long sp) +{ +#ifdef CONFIG_PPC_64S_HASH_MMU + unsigned long sp_vsid; + unsigned long llp = mmu_psize_defs[mmu_linear_psize].sllp; + + if (radix_enabled()) + return; + + if (mmu_has_feature(MMU_FTR_1T_SEGMENT)) + sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_1T) + << SLB_VSID_SHIFT_1T; + else + sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_256M) + << SLB_VSID_SHIFT; + sp_vsid |= SLB_VSID_KERNEL | llp; + p->thread.ksp_vsid = sp_vsid; +#endif +} + +/* + * Copy a thread.. + */ + +/* + * Copy architecture-specific thread state + */ +int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) +{ + unsigned long clone_flags = args->flags; + unsigned long usp = args->stack; + unsigned long tls = args->tls; + struct pt_regs *childregs, *kregs; + extern void ret_from_fork(void); + extern void ret_from_fork_scv(void); + extern void ret_from_kernel_thread(void); + void (*f)(void); + unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE; + struct thread_info *ti = task_thread_info(p); +#ifdef CONFIG_HAVE_HW_BREAKPOINT + int i; +#endif + + klp_init_thread_info(p); + + /* Copy registers */ + sp -= sizeof(struct pt_regs); + childregs = (struct pt_regs *) sp; + if (unlikely(args->fn)) { + /* kernel thread */ + memset(childregs, 0, sizeof(struct pt_regs)); + childregs->gpr[1] = sp + sizeof(struct pt_regs); + /* function */ + if (args->fn) + childregs->gpr[14] = ppc_function_entry((void *)args->fn); +#ifdef CONFIG_PPC64 + clear_tsk_thread_flag(p, TIF_32BIT); + childregs->softe = IRQS_ENABLED; +#endif + childregs->gpr[15] = (unsigned long)args->fn_arg; + p->thread.regs = NULL; /* no user register state */ + ti->flags |= _TIF_RESTOREALL; + f = ret_from_kernel_thread; + } else { + /* user thread */ + struct pt_regs *regs = current_pt_regs(); + *childregs = *regs; + if (usp) + childregs->gpr[1] = usp; + p->thread.regs = childregs; + /* 64s sets this in ret_from_fork */ + if (!IS_ENABLED(CONFIG_PPC_BOOK3S_64)) + childregs->gpr[3] = 0; /* Result from fork() */ + if (clone_flags & CLONE_SETTLS) { + if (!is_32bit_task()) + childregs->gpr[13] = tls; + else + childregs->gpr[2] = tls; + } + + if (trap_is_scv(regs)) + f = ret_from_fork_scv; + else + f = ret_from_fork; + } + childregs->msr &= ~(MSR_FP|MSR_VEC|MSR_VSX); + sp -= STACK_FRAME_OVERHEAD; + + /* + * The way this works is that at some point in the future + * some task will call _switch to switch to the new task. + * That will pop off the stack frame created below and start + * the new task running at ret_from_fork. The new task will + * do some house keeping and then return from the fork or clone + * system call, using the stack frame created above. + */ + ((unsigned long *)sp)[0] = 0; + sp -= sizeof(struct pt_regs); + kregs = (struct pt_regs *) sp; + sp -= STACK_FRAME_OVERHEAD; + p->thread.ksp = sp; +#ifdef CONFIG_HAVE_HW_BREAKPOINT + for (i = 0; i < nr_wp_slots(); i++) + p->thread.ptrace_bps[i] = NULL; +#endif + +#ifdef CONFIG_PPC_FPU_REGS + p->thread.fp_save_area = NULL; +#endif +#ifdef CONFIG_ALTIVEC + p->thread.vr_save_area = NULL; +#endif +#if defined(CONFIG_PPC_BOOK3S_32) && defined(CONFIG_PPC_KUAP) + p->thread.kuap = KUAP_NONE; +#endif +#if defined(CONFIG_BOOKE_OR_40x) && defined(CONFIG_PPC_KUAP) + p->thread.pid = MMU_NO_CONTEXT; +#endif + + setup_ksp_vsid(p, sp); + +#ifdef CONFIG_PPC64 + if (cpu_has_feature(CPU_FTR_DSCR)) { + p->thread.dscr_inherit = current->thread.dscr_inherit; + p->thread.dscr = mfspr(SPRN_DSCR); + } + if (cpu_has_feature(CPU_FTR_HAS_PPR)) + childregs->ppr = DEFAULT_PPR; + + p->thread.tidr = 0; +#endif + /* + * Run with the current AMR value of the kernel + */ +#ifdef CONFIG_PPC_PKEY + if (mmu_has_feature(MMU_FTR_BOOK3S_KUAP)) + kregs->amr = AMR_KUAP_BLOCKED; + + if (mmu_has_feature(MMU_FTR_BOOK3S_KUEP)) + kregs->iamr = AMR_KUEP_BLOCKED; +#endif + kregs->nip = ppc_function_entry(f); + return 0; +} + +void preload_new_slb_context(unsigned long start, unsigned long sp); + +/* + * Set up a thread for executing a new program + */ +void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp) +{ +#ifdef CONFIG_PPC64 + unsigned long load_addr = regs->gpr[2]; /* saved by ELF_PLAT_INIT */ + + if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && !radix_enabled()) + preload_new_slb_context(start, sp); +#endif + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + /* + * Clear any transactional state, we're exec()ing. The cause is + * not important as there will never be a recheckpoint so it's not + * user visible. + */ + if (MSR_TM_SUSPENDED(mfmsr())) + tm_reclaim_current(0); +#endif + + memset(®s->gpr[1], 0, sizeof(regs->gpr) - sizeof(regs->gpr[0])); + regs->ctr = 0; + regs->link = 0; + regs->xer = 0; + regs->ccr = 0; + regs->gpr[1] = sp; + +#ifdef CONFIG_PPC32 + regs->mq = 0; + regs->nip = start; + regs->msr = MSR_USER; +#else + if (!is_32bit_task()) { + unsigned long entry; + + if (is_elf2_task()) { + /* Look ma, no function descriptors! */ + entry = start; + + /* + * Ulrich says: + * The latest iteration of the ABI requires that when + * calling a function (at its global entry point), + * the caller must ensure r12 holds the entry point + * address (so that the function can quickly + * establish addressability). + */ + regs->gpr[12] = start; + /* Make sure that's restored on entry to userspace. */ + set_thread_flag(TIF_RESTOREALL); + } else { + unsigned long toc; + + /* start is a relocated pointer to the function + * descriptor for the elf _start routine. The first + * entry in the function descriptor is the entry + * address of _start and the second entry is the TOC + * value we need to use. + */ + __get_user(entry, (unsigned long __user *)start); + __get_user(toc, (unsigned long __user *)start+1); + + /* Check whether the e_entry function descriptor entries + * need to be relocated before we can use them. + */ + if (load_addr != 0) { + entry += load_addr; + toc += load_addr; + } + regs->gpr[2] = toc; + } + regs_set_return_ip(regs, entry); + regs_set_return_msr(regs, MSR_USER64); + } else { + regs->gpr[2] = 0; + regs_set_return_ip(regs, start); + regs_set_return_msr(regs, MSR_USER32); + } + +#endif +#ifdef CONFIG_VSX + current->thread.used_vsr = 0; +#endif + current->thread.load_slb = 0; + current->thread.load_fp = 0; +#ifdef CONFIG_PPC_FPU_REGS + memset(¤t->thread.fp_state, 0, sizeof(current->thread.fp_state)); + current->thread.fp_save_area = NULL; +#endif +#ifdef CONFIG_ALTIVEC + memset(¤t->thread.vr_state, 0, sizeof(current->thread.vr_state)); + current->thread.vr_state.vscr.u[3] = 0x00010000; /* Java mode disabled */ + current->thread.vr_save_area = NULL; + current->thread.vrsave = 0; + current->thread.used_vr = 0; + current->thread.load_vec = 0; +#endif /* CONFIG_ALTIVEC */ +#ifdef CONFIG_SPE + memset(current->thread.evr, 0, sizeof(current->thread.evr)); + current->thread.acc = 0; + current->thread.spefscr = 0; + current->thread.used_spe = 0; +#endif /* CONFIG_SPE */ +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + current->thread.tm_tfhar = 0; + current->thread.tm_texasr = 0; + current->thread.tm_tfiar = 0; + current->thread.load_tm = 0; +#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ +} +EXPORT_SYMBOL(start_thread); + +#define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \ + | PR_FP_EXC_RES | PR_FP_EXC_INV) + +int set_fpexc_mode(struct task_struct *tsk, unsigned int val) +{ + struct pt_regs *regs = tsk->thread.regs; + + /* This is a bit hairy. If we are an SPE enabled processor + * (have embedded fp) we store the IEEE exception enable flags in + * fpexc_mode. fpexc_mode is also used for setting FP exception + * mode (asyn, precise, disabled) for 'Classic' FP. */ + if (val & PR_FP_EXC_SW_ENABLE) { + if (cpu_has_feature(CPU_FTR_SPE)) { + /* + * When the sticky exception bits are set + * directly by userspace, it must call prctl + * with PR_GET_FPEXC (with PR_FP_EXC_SW_ENABLE + * in the existing prctl settings) or + * PR_SET_FPEXC (with PR_FP_EXC_SW_ENABLE in + * the bits being set). <fenv.h> functions + * saving and restoring the whole + * floating-point environment need to do so + * anyway to restore the prctl settings from + * the saved environment. + */ +#ifdef CONFIG_SPE + tsk->thread.spefscr_last = mfspr(SPRN_SPEFSCR); + tsk->thread.fpexc_mode = val & + (PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT); +#endif + return 0; + } else { + return -EINVAL; + } + } + + /* on a CONFIG_SPE this does not hurt us. The bits that + * __pack_fe01 use do not overlap with bits used for + * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits + * on CONFIG_SPE implementations are reserved so writing to + * them does not change anything */ + if (val > PR_FP_EXC_PRECISE) + return -EINVAL; + tsk->thread.fpexc_mode = __pack_fe01(val); + if (regs != NULL && (regs->msr & MSR_FP) != 0) { + regs_set_return_msr(regs, (regs->msr & ~(MSR_FE0|MSR_FE1)) + | tsk->thread.fpexc_mode); + } + return 0; +} + +int get_fpexc_mode(struct task_struct *tsk, unsigned long adr) +{ + unsigned int val = 0; + + if (tsk->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE) { + if (cpu_has_feature(CPU_FTR_SPE)) { + /* + * When the sticky exception bits are set + * directly by userspace, it must call prctl + * with PR_GET_FPEXC (with PR_FP_EXC_SW_ENABLE + * in the existing prctl settings) or + * PR_SET_FPEXC (with PR_FP_EXC_SW_ENABLE in + * the bits being set). <fenv.h> functions + * saving and restoring the whole + * floating-point environment need to do so + * anyway to restore the prctl settings from + * the saved environment. + */ +#ifdef CONFIG_SPE + tsk->thread.spefscr_last = mfspr(SPRN_SPEFSCR); + val = tsk->thread.fpexc_mode; +#endif + } else + return -EINVAL; + } else { + val = __unpack_fe01(tsk->thread.fpexc_mode); + } + return put_user(val, (unsigned int __user *) adr); +} + +int set_endian(struct task_struct *tsk, unsigned int val) +{ + struct pt_regs *regs = tsk->thread.regs; + + if ((val == PR_ENDIAN_LITTLE && !cpu_has_feature(CPU_FTR_REAL_LE)) || + (val == PR_ENDIAN_PPC_LITTLE && !cpu_has_feature(CPU_FTR_PPC_LE))) + return -EINVAL; + + if (regs == NULL) + return -EINVAL; + + if (val == PR_ENDIAN_BIG) + regs_set_return_msr(regs, regs->msr & ~MSR_LE); + else if (val == PR_ENDIAN_LITTLE || val == PR_ENDIAN_PPC_LITTLE) + regs_set_return_msr(regs, regs->msr | MSR_LE); + else + return -EINVAL; + + return 0; +} + +int get_endian(struct task_struct *tsk, unsigned long adr) +{ + struct pt_regs *regs = tsk->thread.regs; + unsigned int val; + + if (!cpu_has_feature(CPU_FTR_PPC_LE) && + !cpu_has_feature(CPU_FTR_REAL_LE)) + return -EINVAL; + + if (regs == NULL) + return -EINVAL; + + if (regs->msr & MSR_LE) { + if (cpu_has_feature(CPU_FTR_REAL_LE)) + val = PR_ENDIAN_LITTLE; + else + val = PR_ENDIAN_PPC_LITTLE; + } else + val = PR_ENDIAN_BIG; + + return put_user(val, (unsigned int __user *)adr); +} + +int set_unalign_ctl(struct task_struct *tsk, unsigned int val) +{ + tsk->thread.align_ctl = val; + return 0; +} + +int get_unalign_ctl(struct task_struct *tsk, unsigned long adr) +{ + return put_user(tsk->thread.align_ctl, (unsigned int __user *)adr); +} + +static inline int valid_irq_stack(unsigned long sp, struct task_struct *p, + unsigned long nbytes) +{ + unsigned long stack_page; + unsigned long cpu = task_cpu(p); + + stack_page = (unsigned long)hardirq_ctx[cpu]; + if (sp >= stack_page && sp <= stack_page + THREAD_SIZE - nbytes) + return 1; + + stack_page = (unsigned long)softirq_ctx[cpu]; + if (sp >= stack_page && sp <= stack_page + THREAD_SIZE - nbytes) + return 1; + + return 0; +} + +static inline int valid_emergency_stack(unsigned long sp, struct task_struct *p, + unsigned long nbytes) +{ +#ifdef CONFIG_PPC64 + unsigned long stack_page; + unsigned long cpu = task_cpu(p); + + if (!paca_ptrs) + return 0; + + stack_page = (unsigned long)paca_ptrs[cpu]->emergency_sp - THREAD_SIZE; + if (sp >= stack_page && sp <= stack_page + THREAD_SIZE - nbytes) + return 1; + +# ifdef CONFIG_PPC_BOOK3S_64 + stack_page = (unsigned long)paca_ptrs[cpu]->nmi_emergency_sp - THREAD_SIZE; + if (sp >= stack_page && sp <= stack_page + THREAD_SIZE - nbytes) + return 1; + + stack_page = (unsigned long)paca_ptrs[cpu]->mc_emergency_sp - THREAD_SIZE; + if (sp >= stack_page && sp <= stack_page + THREAD_SIZE - nbytes) + return 1; +# endif +#endif + + return 0; +} + + +int validate_sp(unsigned long sp, struct task_struct *p, + unsigned long nbytes) +{ + unsigned long stack_page = (unsigned long)task_stack_page(p); + + if (sp < THREAD_SIZE) + return 0; + + if (sp >= stack_page && sp <= stack_page + THREAD_SIZE - nbytes) + return 1; + + if (valid_irq_stack(sp, p, nbytes)) + return 1; + + return valid_emergency_stack(sp, p, nbytes); +} + +EXPORT_SYMBOL(validate_sp); + +static unsigned long ___get_wchan(struct task_struct *p) +{ + unsigned long ip, sp; + int count = 0; + + sp = p->thread.ksp; + if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD)) + return 0; + + do { + sp = READ_ONCE_NOCHECK(*(unsigned long *)sp); + if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD) || + task_is_running(p)) + return 0; + if (count > 0) { + ip = READ_ONCE_NOCHECK(((unsigned long *)sp)[STACK_FRAME_LR_SAVE]); + if (!in_sched_functions(ip)) + return ip; + } + } while (count++ < 16); + return 0; +} + +unsigned long __get_wchan(struct task_struct *p) +{ + unsigned long ret; + + if (!try_get_task_stack(p)) + return 0; + + ret = ___get_wchan(p); + + put_task_stack(p); + + return ret; +} + +static int kstack_depth_to_print = CONFIG_PRINT_STACK_DEPTH; + +void __no_sanitize_address show_stack(struct task_struct *tsk, + unsigned long *stack, + const char *loglvl) +{ + unsigned long sp, ip, lr, newsp; + int count = 0; + int firstframe = 1; + unsigned long ret_addr; + int ftrace_idx = 0; + + if (tsk == NULL) + tsk = current; + + if (!try_get_task_stack(tsk)) + return; + + sp = (unsigned long) stack; + if (sp == 0) { + if (tsk == current) + sp = current_stack_frame(); + else + sp = tsk->thread.ksp; + } + + lr = 0; + printk("%sCall Trace:\n", loglvl); + do { + if (!validate_sp(sp, tsk, STACK_FRAME_OVERHEAD)) + break; + + stack = (unsigned long *) sp; + newsp = stack[0]; + ip = stack[STACK_FRAME_LR_SAVE]; + if (!firstframe || ip != lr) { + printk("%s["REG"] ["REG"] %pS", + loglvl, sp, ip, (void *)ip); + ret_addr = ftrace_graph_ret_addr(current, + &ftrace_idx, ip, stack); + if (ret_addr != ip) + pr_cont(" (%pS)", (void *)ret_addr); + if (firstframe) + pr_cont(" (unreliable)"); + pr_cont("\n"); + } + firstframe = 0; + + /* + * See if this is an exception frame. + * We look for the "regshere" marker in the current frame. + */ + if (validate_sp(sp, tsk, STACK_FRAME_WITH_PT_REGS) + && stack[STACK_FRAME_MARKER] == STACK_FRAME_REGS_MARKER) { + struct pt_regs *regs = (struct pt_regs *) + (sp + STACK_FRAME_OVERHEAD); + + lr = regs->link; + printk("%s--- interrupt: %lx at %pS\n", + loglvl, regs->trap, (void *)regs->nip); + __show_regs(regs); + printk("%s--- interrupt: %lx\n", + loglvl, regs->trap); + + firstframe = 1; + } + + sp = newsp; + } while (count++ < kstack_depth_to_print); + + put_task_stack(tsk); +} + +#ifdef CONFIG_PPC64 +/* Called with hard IRQs off */ +void notrace __ppc64_runlatch_on(void) +{ + struct thread_info *ti = current_thread_info(); + + if (cpu_has_feature(CPU_FTR_ARCH_206)) { + /* + * Least significant bit (RUN) is the only writable bit of + * the CTRL register, so we can avoid mfspr. 2.06 is not the + * earliest ISA where this is the case, but it's convenient. + */ + mtspr(SPRN_CTRLT, CTRL_RUNLATCH); + } else { + unsigned long ctrl; + + /* + * Some architectures (e.g., Cell) have writable fields other + * than RUN, so do the read-modify-write. + */ + ctrl = mfspr(SPRN_CTRLF); + ctrl |= CTRL_RUNLATCH; + mtspr(SPRN_CTRLT, ctrl); + } + + ti->local_flags |= _TLF_RUNLATCH; +} + +/* Called with hard IRQs off */ +void notrace __ppc64_runlatch_off(void) +{ + struct thread_info *ti = current_thread_info(); + + ti->local_flags &= ~_TLF_RUNLATCH; + + if (cpu_has_feature(CPU_FTR_ARCH_206)) { + mtspr(SPRN_CTRLT, 0); + } else { + unsigned long ctrl; + + ctrl = mfspr(SPRN_CTRLF); + ctrl &= ~CTRL_RUNLATCH; + mtspr(SPRN_CTRLT, ctrl); + } +} +#endif /* CONFIG_PPC64 */ + +unsigned long arch_align_stack(unsigned long sp) +{ + if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) + sp -= prandom_u32_max(PAGE_SIZE); + return sp & ~0xf; +} diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c new file mode 100644 index 000000000..8537c354c --- /dev/null +++ b/arch/powerpc/kernel/prom.c @@ -0,0 +1,997 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Procedures for creating, accessing and interpreting the device tree. + * + * Paul Mackerras August 1996. + * Copyright (C) 1996-2005 Paul Mackerras. + * + * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. + * {engebret|bergner}@us.ibm.com + */ + +#undef DEBUG + +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/threads.h> +#include <linux/spinlock.h> +#include <linux/types.h> +#include <linux/pci.h> +#include <linux/delay.h> +#include <linux/initrd.h> +#include <linux/bitops.h> +#include <linux/export.h> +#include <linux/kexec.h> +#include <linux/irq.h> +#include <linux/memblock.h> +#include <linux/of.h> +#include <linux/of_fdt.h> +#include <linux/libfdt.h> +#include <linux/cpu.h> +#include <linux/pgtable.h> +#include <linux/seq_buf.h> + +#include <asm/rtas.h> +#include <asm/page.h> +#include <asm/processor.h> +#include <asm/irq.h> +#include <asm/io.h> +#include <asm/kdump.h> +#include <asm/smp.h> +#include <asm/mmu.h> +#include <asm/paca.h> +#include <asm/powernv.h> +#include <asm/iommu.h> +#include <asm/btext.h> +#include <asm/sections.h> +#include <asm/setup.h> +#include <asm/pci-bridge.h> +#include <asm/kexec.h> +#include <asm/opal.h> +#include <asm/fadump.h> +#include <asm/epapr_hcalls.h> +#include <asm/firmware.h> +#include <asm/dt_cpu_ftrs.h> +#include <asm/drmem.h> +#include <asm/ultravisor.h> +#include <asm/prom.h> + +#include <mm/mmu_decl.h> + +#ifdef DEBUG +#define DBG(fmt...) printk(KERN_ERR fmt) +#else +#define DBG(fmt...) +#endif + +int *chip_id_lookup_table; + +#ifdef CONFIG_PPC64 +int __initdata iommu_is_off; +int __initdata iommu_force_on; +unsigned long tce_alloc_start, tce_alloc_end; +u64 ppc64_rma_size; +#endif +static phys_addr_t first_memblock_size; +static int __initdata boot_cpu_count; + +static int __init early_parse_mem(char *p) +{ + if (!p) + return 1; + + memory_limit = PAGE_ALIGN(memparse(p, &p)); + DBG("memory limit = 0x%llx\n", memory_limit); + + return 0; +} +early_param("mem", early_parse_mem); + +/* + * overlaps_initrd - check for overlap with page aligned extension of + * initrd. + */ +static inline int overlaps_initrd(unsigned long start, unsigned long size) +{ +#ifdef CONFIG_BLK_DEV_INITRD + if (!initrd_start) + return 0; + + return (start + size) > ALIGN_DOWN(initrd_start, PAGE_SIZE) && + start <= ALIGN(initrd_end, PAGE_SIZE); +#else + return 0; +#endif +} + +/** + * move_device_tree - move tree to an unused area, if needed. + * + * The device tree may be allocated beyond our memory limit, or inside the + * crash kernel region for kdump, or within the page aligned range of initrd. + * If so, move it out of the way. + */ +static void __init move_device_tree(void) +{ + unsigned long start, size; + void *p; + + DBG("-> move_device_tree\n"); + + start = __pa(initial_boot_params); + size = fdt_totalsize(initial_boot_params); + + if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) || + !memblock_is_memory(start + size - 1) || + overlaps_crashkernel(start, size) || overlaps_initrd(start, size)) { + p = memblock_alloc_raw(size, PAGE_SIZE); + if (!p) + panic("Failed to allocate %lu bytes to move device tree\n", + size); + memcpy(p, initial_boot_params, size); + initial_boot_params = p; + DBG("Moved device tree to 0x%px\n", p); + } + + DBG("<- move_device_tree\n"); +} + +/* + * ibm,pa/pi-features is a per-cpu property that contains a string of + * attribute descriptors, each of which has a 2 byte header plus up + * to 254 bytes worth of processor attribute bits. First header + * byte specifies the number of bytes following the header. + * Second header byte is an "attribute-specifier" type, of which + * zero is the only currently-defined value. + * Implementation: Pass in the byte and bit offset for the feature + * that we are interested in. The function will return -1 if the + * pa-features property is missing, or a 1/0 to indicate if the feature + * is supported/not supported. Note that the bit numbers are + * big-endian to match the definition in PAPR. + */ +struct ibm_feature { + unsigned long cpu_features; /* CPU_FTR_xxx bit */ + unsigned long mmu_features; /* MMU_FTR_xxx bit */ + unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */ + unsigned int cpu_user_ftrs2; /* PPC_FEATURE2_xxx bit */ + unsigned char pabyte; /* byte number in ibm,pa/pi-features */ + unsigned char pabit; /* bit number (big-endian) */ + unsigned char invert; /* if 1, pa bit set => clear feature */ +}; + +static struct ibm_feature ibm_pa_features[] __initdata = { + { .pabyte = 0, .pabit = 0, .cpu_user_ftrs = PPC_FEATURE_HAS_MMU }, + { .pabyte = 0, .pabit = 1, .cpu_user_ftrs = PPC_FEATURE_HAS_FPU }, + { .pabyte = 0, .pabit = 3, .cpu_features = CPU_FTR_CTRL }, + { .pabyte = 0, .pabit = 6, .cpu_features = CPU_FTR_NOEXECUTE }, + { .pabyte = 1, .pabit = 2, .mmu_features = MMU_FTR_CI_LARGE_PAGE }, +#ifdef CONFIG_PPC_RADIX_MMU + { .pabyte = 40, .pabit = 0, .mmu_features = MMU_FTR_TYPE_RADIX | MMU_FTR_GTSE }, +#endif + { .pabyte = 5, .pabit = 0, .cpu_features = CPU_FTR_REAL_LE, + .cpu_user_ftrs = PPC_FEATURE_TRUE_LE }, + /* + * If the kernel doesn't support TM (ie CONFIG_PPC_TRANSACTIONAL_MEM=n), + * we don't want to turn on TM here, so we use the *_COMP versions + * which are 0 if the kernel doesn't support TM. + */ + { .pabyte = 22, .pabit = 0, .cpu_features = CPU_FTR_TM_COMP, + .cpu_user_ftrs2 = PPC_FEATURE2_HTM_COMP | PPC_FEATURE2_HTM_NOSC_COMP }, + + { .pabyte = 64, .pabit = 0, .cpu_features = CPU_FTR_DAWR1 }, +}; + +/* + * ibm,pi-features property provides the support of processor specific + * options not described in ibm,pa-features. Right now use byte 0, bit 3 + * which indicates the occurrence of DSI interrupt when the paste operation + * on the suspended NX window. + */ +static struct ibm_feature ibm_pi_features[] __initdata = { + { .pabyte = 0, .pabit = 3, .mmu_features = MMU_FTR_NX_DSI }, +}; + +static void __init scan_features(unsigned long node, const unsigned char *ftrs, + unsigned long tablelen, + struct ibm_feature *fp, + unsigned long ft_size) +{ + unsigned long i, len, bit; + + /* find descriptor with type == 0 */ + for (;;) { + if (tablelen < 3) + return; + len = 2 + ftrs[0]; + if (tablelen < len) + return; /* descriptor 0 not found */ + if (ftrs[1] == 0) + break; + tablelen -= len; + ftrs += len; + } + + /* loop over bits we know about */ + for (i = 0; i < ft_size; ++i, ++fp) { + if (fp->pabyte >= ftrs[0]) + continue; + bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1; + if (bit ^ fp->invert) { + cur_cpu_spec->cpu_features |= fp->cpu_features; + cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs; + cur_cpu_spec->cpu_user_features2 |= fp->cpu_user_ftrs2; + cur_cpu_spec->mmu_features |= fp->mmu_features; + } else { + cur_cpu_spec->cpu_features &= ~fp->cpu_features; + cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs; + cur_cpu_spec->cpu_user_features2 &= ~fp->cpu_user_ftrs2; + cur_cpu_spec->mmu_features &= ~fp->mmu_features; + } + } +} + +static void __init check_cpu_features(unsigned long node, char *name, + struct ibm_feature *fp, + unsigned long size) +{ + const unsigned char *pa_ftrs; + int tablelen; + + pa_ftrs = of_get_flat_dt_prop(node, name, &tablelen); + if (pa_ftrs == NULL) + return; + + scan_features(node, pa_ftrs, tablelen, fp, size); +} + +#ifdef CONFIG_PPC_64S_HASH_MMU +static void __init init_mmu_slb_size(unsigned long node) +{ + const __be32 *slb_size_ptr; + + slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL) ? : + of_get_flat_dt_prop(node, "ibm,slb-size", NULL); + + if (slb_size_ptr) + mmu_slb_size = be32_to_cpup(slb_size_ptr); +} +#else +#define init_mmu_slb_size(node) do { } while(0) +#endif + +static struct feature_property { + const char *name; + u32 min_value; + unsigned long cpu_feature; + unsigned long cpu_user_ftr; +} feature_properties[] __initdata = { +#ifdef CONFIG_ALTIVEC + {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, + {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, +#endif /* CONFIG_ALTIVEC */ +#ifdef CONFIG_VSX + /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */ + {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX}, +#endif /* CONFIG_VSX */ +#ifdef CONFIG_PPC64 + {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP}, + {"ibm,purr", 1, CPU_FTR_PURR, 0}, + {"ibm,spurr", 1, CPU_FTR_SPURR, 0}, +#endif /* CONFIG_PPC64 */ +}; + +#if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU) +static __init void identical_pvr_fixup(unsigned long node) +{ + unsigned int pvr; + const char *model = of_get_flat_dt_prop(node, "model", NULL); + + /* + * Since 440GR(x)/440EP(x) processors have the same pvr, + * we check the node path and set bit 28 in the cur_cpu_spec + * pvr for EP(x) processor version. This bit is always 0 in + * the "real" pvr. Then we call identify_cpu again with + * the new logical pvr to enable FPU support. + */ + if (model && strstr(model, "440EP")) { + pvr = cur_cpu_spec->pvr_value | 0x8; + identify_cpu(0, pvr); + DBG("Using logical pvr %x for %s\n", pvr, model); + } +} +#else +#define identical_pvr_fixup(node) do { } while(0) +#endif + +static void __init check_cpu_feature_properties(unsigned long node) +{ + int i; + struct feature_property *fp = feature_properties; + const __be32 *prop; + + for (i = 0; i < (int)ARRAY_SIZE(feature_properties); ++i, ++fp) { + prop = of_get_flat_dt_prop(node, fp->name, NULL); + if (prop && be32_to_cpup(prop) >= fp->min_value) { + cur_cpu_spec->cpu_features |= fp->cpu_feature; + cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr; + } + } +} + +static int __init early_init_dt_scan_cpus(unsigned long node, + const char *uname, int depth, + void *data) +{ + const char *type = of_get_flat_dt_prop(node, "device_type", NULL); + const __be32 *prop; + const __be32 *intserv; + int i, nthreads; + int len; + int found = -1; + int found_thread = 0; + + /* We are scanning "cpu" nodes only */ + if (type == NULL || strcmp(type, "cpu") != 0) + return 0; + + /* Get physical cpuid */ + intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len); + if (!intserv) + intserv = of_get_flat_dt_prop(node, "reg", &len); + + nthreads = len / sizeof(int); + + /* + * Now see if any of these threads match our boot cpu. + * NOTE: This must match the parsing done in smp_setup_cpu_maps. + */ + for (i = 0; i < nthreads; i++) { + if (be32_to_cpu(intserv[i]) == + fdt_boot_cpuid_phys(initial_boot_params)) { + found = boot_cpu_count; + found_thread = i; + } +#ifdef CONFIG_SMP + /* logical cpu id is always 0 on UP kernels */ + boot_cpu_count++; +#endif + } + + /* Not the boot CPU */ + if (found < 0) + return 0; + + DBG("boot cpu: logical %d physical %d\n", found, + be32_to_cpu(intserv[found_thread])); + boot_cpuid = found; + + if (IS_ENABLED(CONFIG_PPC64)) + boot_cpu_hwid = be32_to_cpu(intserv[found_thread]); + + /* + * PAPR defines "logical" PVR values for cpus that + * meet various levels of the architecture: + * 0x0f000001 Architecture version 2.04 + * 0x0f000002 Architecture version 2.05 + * If the cpu-version property in the cpu node contains + * such a value, we call identify_cpu again with the + * logical PVR value in order to use the cpu feature + * bits appropriate for the architecture level. + * + * A POWER6 partition in "POWER6 architected" mode + * uses the 0x0f000002 PVR value; in POWER5+ mode + * it uses 0x0f000001. + * + * If we're using device tree CPU feature discovery then we don't + * support the cpu-version property, and it's the responsibility of the + * firmware/hypervisor to provide the correct feature set for the + * architecture level via the ibm,powerpc-cpu-features binding. + */ + if (!dt_cpu_ftrs_in_use()) { + prop = of_get_flat_dt_prop(node, "cpu-version", NULL); + if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000) { + identify_cpu(0, be32_to_cpup(prop)); + seq_buf_printf(&ppc_hw_desc, "0x%04x ", be32_to_cpup(prop)); + } + + check_cpu_feature_properties(node); + check_cpu_features(node, "ibm,pa-features", ibm_pa_features, + ARRAY_SIZE(ibm_pa_features)); + check_cpu_features(node, "ibm,pi-features", ibm_pi_features, + ARRAY_SIZE(ibm_pi_features)); + } + + identical_pvr_fixup(node); + init_mmu_slb_size(node); + +#ifdef CONFIG_PPC64 + if (nthreads == 1) + cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; + else if (!dt_cpu_ftrs_in_use()) + cur_cpu_spec->cpu_features |= CPU_FTR_SMT; +#endif + + return 0; +} + +static int __init early_init_dt_scan_chosen_ppc(unsigned long node, + const char *uname, + int depth, void *data) +{ + const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */ + + /* Use common scan routine to determine if this is the chosen node */ + if (early_init_dt_scan_chosen(data) < 0) + return 0; + +#ifdef CONFIG_PPC64 + /* check if iommu is forced on or off */ + if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL) + iommu_is_off = 1; + if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL) + iommu_force_on = 1; +#endif + + /* mem=x on the command line is the preferred mechanism */ + lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL); + if (lprop) + memory_limit = *lprop; + +#ifdef CONFIG_PPC64 + lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL); + if (lprop) + tce_alloc_start = *lprop; + lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL); + if (lprop) + tce_alloc_end = *lprop; +#endif + +#ifdef CONFIG_KEXEC_CORE + lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL); + if (lprop) + crashk_res.start = *lprop; + + lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL); + if (lprop) + crashk_res.end = crashk_res.start + *lprop - 1; +#endif + + /* break now */ + return 1; +} + +/* + * Compare the range against max mem limit and update + * size if it cross the limit. + */ + +#ifdef CONFIG_SPARSEMEM +static bool __init validate_mem_limit(u64 base, u64 *size) +{ + u64 max_mem = 1UL << (MAX_PHYSMEM_BITS); + + if (base >= max_mem) + return false; + if ((base + *size) > max_mem) + *size = max_mem - base; + return true; +} +#else +static bool __init validate_mem_limit(u64 base, u64 *size) +{ + return true; +} +#endif + +#ifdef CONFIG_PPC_PSERIES +/* + * Interpret the ibm dynamic reconfiguration memory LMBs. + * This contains a list of memory blocks along with NUMA affinity + * information. + */ +static int __init early_init_drmem_lmb(struct drmem_lmb *lmb, + const __be32 **usm, + void *data) +{ + u64 base, size; + int is_kexec_kdump = 0, rngs; + + base = lmb->base_addr; + size = drmem_lmb_size(); + rngs = 1; + + /* + * Skip this block if the reserved bit is set in flags + * or if the block is not assigned to this partition. + */ + if ((lmb->flags & DRCONF_MEM_RESERVED) || + !(lmb->flags & DRCONF_MEM_ASSIGNED)) + return 0; + + if (*usm) + is_kexec_kdump = 1; + + if (is_kexec_kdump) { + /* + * For each memblock in ibm,dynamic-memory, a + * corresponding entry in linux,drconf-usable-memory + * property contains a counter 'p' followed by 'p' + * (base, size) duple. Now read the counter from + * linux,drconf-usable-memory property + */ + rngs = dt_mem_next_cell(dt_root_size_cells, usm); + if (!rngs) /* there are no (base, size) duple */ + return 0; + } + + do { + if (is_kexec_kdump) { + base = dt_mem_next_cell(dt_root_addr_cells, usm); + size = dt_mem_next_cell(dt_root_size_cells, usm); + } + + if (iommu_is_off) { + if (base >= 0x80000000ul) + continue; + if ((base + size) > 0x80000000ul) + size = 0x80000000ul - base; + } + + if (!validate_mem_limit(base, &size)) + continue; + + DBG("Adding: %llx -> %llx\n", base, size); + memblock_add(base, size); + + if (lmb->flags & DRCONF_MEM_HOTREMOVABLE) + memblock_mark_hotplug(base, size); + } while (--rngs); + + return 0; +} +#endif /* CONFIG_PPC_PSERIES */ + +static int __init early_init_dt_scan_memory_ppc(void) +{ +#ifdef CONFIG_PPC_PSERIES + const void *fdt = initial_boot_params; + int node = fdt_path_offset(fdt, "/ibm,dynamic-reconfiguration-memory"); + + if (node > 0) + walk_drmem_lmbs_early(node, NULL, early_init_drmem_lmb); + +#endif + + return early_init_dt_scan_memory(); +} + +/* + * For a relocatable kernel, we need to get the memstart_addr first, + * then use it to calculate the virtual kernel start address. This has + * to happen at a very early stage (before machine_init). In this case, + * we just want to get the memstart_address and would not like to mess the + * memblock at this stage. So introduce a variable to skip the memblock_add() + * for this reason. + */ +#ifdef CONFIG_RELOCATABLE +static int add_mem_to_memblock = 1; +#else +#define add_mem_to_memblock 1 +#endif + +void __init early_init_dt_add_memory_arch(u64 base, u64 size) +{ +#ifdef CONFIG_PPC64 + if (iommu_is_off) { + if (base >= 0x80000000ul) + return; + if ((base + size) > 0x80000000ul) + size = 0x80000000ul - base; + } +#endif + /* Keep track of the beginning of memory -and- the size of + * the very first block in the device-tree as it represents + * the RMA on ppc64 server + */ + if (base < memstart_addr) { + memstart_addr = base; + first_memblock_size = size; + } + + /* Add the chunk to the MEMBLOCK list */ + if (add_mem_to_memblock) { + if (validate_mem_limit(base, &size)) + memblock_add(base, size); + } +} + +static void __init early_reserve_mem_dt(void) +{ + unsigned long i, dt_root; + int len; + const __be32 *prop; + + early_init_fdt_reserve_self(); + early_init_fdt_scan_reserved_mem(); + + dt_root = of_get_flat_dt_root(); + + prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len); + + if (!prop) + return; + + DBG("Found new-style reserved-ranges\n"); + + /* Each reserved range is an (address,size) pair, 2 cells each, + * totalling 4 cells per range. */ + for (i = 0; i < len / (sizeof(*prop) * 4); i++) { + u64 base, size; + + base = of_read_number(prop + (i * 4) + 0, 2); + size = of_read_number(prop + (i * 4) + 2, 2); + + if (size) { + DBG("reserving: %llx -> %llx\n", base, size); + memblock_reserve(base, size); + } + } +} + +static void __init early_reserve_mem(void) +{ + __be64 *reserve_map; + + reserve_map = (__be64 *)(((unsigned long)initial_boot_params) + + fdt_off_mem_rsvmap(initial_boot_params)); + + /* Look for the new "reserved-regions" property in the DT */ + early_reserve_mem_dt(); + +#ifdef CONFIG_BLK_DEV_INITRD + /* Then reserve the initrd, if any */ + if (initrd_start && (initrd_end > initrd_start)) { + memblock_reserve(ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE), + ALIGN(initrd_end, PAGE_SIZE) - + ALIGN_DOWN(initrd_start, PAGE_SIZE)); + } +#endif /* CONFIG_BLK_DEV_INITRD */ + + if (!IS_ENABLED(CONFIG_PPC32)) + return; + + /* + * Handle the case where we might be booting from an old kexec + * image that setup the mem_rsvmap as pairs of 32-bit values + */ + if (be64_to_cpup(reserve_map) > 0xffffffffull) { + u32 base_32, size_32; + __be32 *reserve_map_32 = (__be32 *)reserve_map; + + DBG("Found old 32-bit reserve map\n"); + + while (1) { + base_32 = be32_to_cpup(reserve_map_32++); + size_32 = be32_to_cpup(reserve_map_32++); + if (size_32 == 0) + break; + DBG("reserving: %x -> %x\n", base_32, size_32); + memblock_reserve(base_32, size_32); + } + return; + } +} + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +static bool tm_disabled __initdata; + +static int __init parse_ppc_tm(char *str) +{ + bool res; + + if (kstrtobool(str, &res)) + return -EINVAL; + + tm_disabled = !res; + + return 0; +} +early_param("ppc_tm", parse_ppc_tm); + +static void __init tm_init(void) +{ + if (tm_disabled) { + pr_info("Disabling hardware transactional memory (HTM)\n"); + cur_cpu_spec->cpu_user_features2 &= + ~(PPC_FEATURE2_HTM_NOSC | PPC_FEATURE2_HTM); + cur_cpu_spec->cpu_features &= ~CPU_FTR_TM; + return; + } + + pnv_tm_init(); +} +#else +static void tm_init(void) { } +#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ + +static int __init +early_init_dt_scan_model(unsigned long node, const char *uname, + int depth, void *data) +{ + const char *prop; + + if (depth != 0) + return 0; + + prop = of_get_flat_dt_prop(node, "model", NULL); + if (prop) + seq_buf_printf(&ppc_hw_desc, "%s ", prop); + + /* break now */ + return 1; +} + +#ifdef CONFIG_PPC64 +static void __init save_fscr_to_task(void) +{ + /* + * Ensure the init_task (pid 0, aka swapper) uses the value of FSCR we + * have configured via the device tree features or via __init_FSCR(). + * That value will then be propagated to pid 1 (init) and all future + * processes. + */ + if (early_cpu_has_feature(CPU_FTR_ARCH_207S)) + init_task.thread.fscr = mfspr(SPRN_FSCR); +} +#else +static inline void save_fscr_to_task(void) {} +#endif + + +void __init early_init_devtree(void *params) +{ + phys_addr_t limit; + + DBG(" -> early_init_devtree(%px)\n", params); + + /* Too early to BUG_ON(), do it by hand */ + if (!early_init_dt_verify(params)) + panic("BUG: Failed verifying flat device tree, bad version?"); + + of_scan_flat_dt(early_init_dt_scan_model, NULL); + +#ifdef CONFIG_PPC_RTAS + /* Some machines might need RTAS info for debugging, grab it now. */ + of_scan_flat_dt(early_init_dt_scan_rtas, NULL); +#endif + +#ifdef CONFIG_PPC_POWERNV + /* Some machines might need OPAL info for debugging, grab it now. */ + of_scan_flat_dt(early_init_dt_scan_opal, NULL); + + /* Scan tree for ultravisor feature */ + of_scan_flat_dt(early_init_dt_scan_ultravisor, NULL); +#endif + +#if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP) + /* scan tree to see if dump is active during last boot */ + of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL); +#endif + + /* Retrieve various informations from the /chosen node of the + * device-tree, including the platform type, initrd location and + * size, TCE reserve, and more ... + */ + of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line); + + /* Scan memory nodes and rebuild MEMBLOCKs */ + early_init_dt_scan_root(); + early_init_dt_scan_memory_ppc(); + + /* + * As generic code authors expect to be able to use static keys + * in early_param() handlers, we initialize the static keys just + * before parsing early params (it's fine to call jump_label_init() + * more than once). + */ + jump_label_init(); + parse_early_param(); + + /* make sure we've parsed cmdline for mem= before this */ + if (memory_limit) + first_memblock_size = min_t(u64, first_memblock_size, memory_limit); + setup_initial_memory_limit(memstart_addr, first_memblock_size); + /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */ + memblock_reserve(PHYSICAL_START, __pa(_end) - PHYSICAL_START); + /* If relocatable, reserve first 32k for interrupt vectors etc. */ + if (PHYSICAL_START > MEMORY_START) + memblock_reserve(MEMORY_START, 0x8000); + reserve_kdump_trampoline(); +#if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP) + /* + * If we fail to reserve memory for firmware-assisted dump then + * fallback to kexec based kdump. + */ + if (fadump_reserve_mem() == 0) +#endif + reserve_crashkernel(); + early_reserve_mem(); + + /* Ensure that total memory size is page-aligned. */ + limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE); + memblock_enforce_memory_limit(limit); + +#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_PPC_4K_PAGES) + if (!early_radix_enabled()) + memblock_cap_memory_range(0, 1UL << (H_MAX_PHYSMEM_BITS)); +#endif + + memblock_allow_resize(); + memblock_dump_all(); + + DBG("Phys. mem: %llx\n", (unsigned long long)memblock_phys_mem_size()); + + /* We may need to relocate the flat tree, do it now. + * FIXME .. and the initrd too? */ + move_device_tree(); + + DBG("Scanning CPUs ...\n"); + + dt_cpu_ftrs_scan(); + + // We can now add the CPU name & PVR to the hardware description + seq_buf_printf(&ppc_hw_desc, "%s 0x%04lx ", cur_cpu_spec->cpu_name, mfspr(SPRN_PVR)); + + /* Retrieve CPU related informations from the flat tree + * (altivec support, boot CPU ID, ...) + */ + of_scan_flat_dt(early_init_dt_scan_cpus, NULL); + if (boot_cpuid < 0) { + printk("Failed to identify boot CPU !\n"); + BUG(); + } + + save_fscr_to_task(); + +#if defined(CONFIG_SMP) && defined(CONFIG_PPC64) + /* We'll later wait for secondaries to check in; there are + * NCPUS-1 non-boot CPUs :-) + */ + spinning_secondaries = boot_cpu_count - 1; +#endif + + mmu_early_init_devtree(); + +#ifdef CONFIG_PPC_POWERNV + /* Scan and build the list of machine check recoverable ranges */ + of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL); +#endif + epapr_paravirt_early_init(); + + /* Now try to figure out if we are running on LPAR and so on */ + pseries_probe_fw_features(); + + /* + * Initialize pkey features and default AMR/IAMR values + */ + pkey_early_init_devtree(); + +#ifdef CONFIG_PPC_PS3 + /* Identify PS3 firmware */ + if (of_flat_dt_is_compatible(of_get_flat_dt_root(), "sony,ps3")) + powerpc_firmware_features |= FW_FEATURE_PS3_POSSIBLE; +#endif + + tm_init(); + + DBG(" <- early_init_devtree()\n"); +} + +#ifdef CONFIG_RELOCATABLE +/* + * This function run before early_init_devtree, so we have to init + * initial_boot_params. + */ +void __init early_get_first_memblock_info(void *params, phys_addr_t *size) +{ + /* Setup flat device-tree pointer */ + initial_boot_params = params; + + /* + * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid + * mess the memblock. + */ + add_mem_to_memblock = 0; + early_init_dt_scan_root(); + early_init_dt_scan_memory_ppc(); + add_mem_to_memblock = 1; + + if (size) + *size = first_memblock_size; +} +#endif + +/******* + * + * New implementation of the OF "find" APIs, return a refcounted + * object, call of_node_put() when done. The device tree and list + * are protected by a rw_lock. + * + * Note that property management will need some locking as well, + * this isn't dealt with yet. + * + *******/ + +/** + * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device + * @np: device node of the device + * + * This looks for a property "ibm,chip-id" in the node or any + * of its parents and returns its content, or -1 if it cannot + * be found. + */ +int of_get_ibm_chip_id(struct device_node *np) +{ + of_node_get(np); + while (np) { + u32 chip_id; + + /* + * Skiboot may produce memory nodes that contain more than one + * cell in chip-id, we only read the first one here. + */ + if (!of_property_read_u32(np, "ibm,chip-id", &chip_id)) { + of_node_put(np); + return chip_id; + } + + np = of_get_next_parent(np); + } + return -1; +} +EXPORT_SYMBOL(of_get_ibm_chip_id); + +/** + * cpu_to_chip_id - Return the cpus chip-id + * @cpu: The logical cpu number. + * + * Return the value of the ibm,chip-id property corresponding to the given + * logical cpu number. If the chip-id can not be found, returns -1. + */ +int cpu_to_chip_id(int cpu) +{ + struct device_node *np; + int ret = -1, idx; + + idx = cpu / threads_per_core; + if (chip_id_lookup_table && chip_id_lookup_table[idx] != -1) + return chip_id_lookup_table[idx]; + + np = of_get_cpu_node(cpu, NULL); + if (np) { + ret = of_get_ibm_chip_id(np); + of_node_put(np); + + if (chip_id_lookup_table) + chip_id_lookup_table[idx] = ret; + } + + return ret; +} +EXPORT_SYMBOL(cpu_to_chip_id); + +bool arch_match_cpu_phys_id(int cpu, u64 phys_id) +{ +#ifdef CONFIG_SMP + /* + * Early firmware scanning must use this rather than + * get_hard_smp_processor_id because we don't have pacas allocated + * until memory topology is discovered. + */ + if (cpu_to_phys_id != NULL) + return (int)phys_id == cpu_to_phys_id[cpu]; +#endif + + return (int)phys_id == get_hard_smp_processor_id(cpu); +} diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c new file mode 100644 index 000000000..d464ba412 --- /dev/null +++ b/arch/powerpc/kernel/prom_init.c @@ -0,0 +1,3493 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Procedures for interfacing to Open Firmware. + * + * Paul Mackerras August 1996. + * Copyright (C) 1996-2005 Paul Mackerras. + * + * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. + * {engebret|bergner}@us.ibm.com + */ + +#undef DEBUG_PROM + +/* we cannot use FORTIFY as it brings in new symbols */ +#define __NO_FORTIFY + +#include <linux/stdarg.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/threads.h> +#include <linux/spinlock.h> +#include <linux/types.h> +#include <linux/pci.h> +#include <linux/proc_fs.h> +#include <linux/delay.h> +#include <linux/initrd.h> +#include <linux/bitops.h> +#include <linux/pgtable.h> +#include <linux/printk.h> +#include <linux/of.h> +#include <linux/of_fdt.h> +#include <asm/prom.h> +#include <asm/rtas.h> +#include <asm/page.h> +#include <asm/processor.h> +#include <asm/interrupt.h> +#include <asm/irq.h> +#include <asm/io.h> +#include <asm/smp.h> +#include <asm/mmu.h> +#include <asm/iommu.h> +#include <asm/btext.h> +#include <asm/sections.h> +#include <asm/setup.h> +#include <asm/asm-prototypes.h> +#include <asm/ultravisor-api.h> + +#include <linux/linux_logo.h> + +/* All of prom_init bss lives here */ +#define __prombss __section(".bss.prominit") + +/* + * Eventually bump that one up + */ +#define DEVTREE_CHUNK_SIZE 0x100000 + +/* + * This is the size of the local memory reserve map that gets copied + * into the boot params passed to the kernel. That size is totally + * flexible as the kernel just reads the list until it encounters an + * entry with size 0, so it can be changed without breaking binary + * compatibility + */ +#define MEM_RESERVE_MAP_SIZE 8 + +/* + * prom_init() is called very early on, before the kernel text + * and data have been mapped to KERNELBASE. At this point the code + * is running at whatever address it has been loaded at. + * On ppc32 we compile with -mrelocatable, which means that references + * to extern and static variables get relocated automatically. + * ppc64 objects are always relocatable, we just need to relocate the + * TOC. + * + * Because OF may have mapped I/O devices into the area starting at + * KERNELBASE, particularly on CHRP machines, we can't safely call + * OF once the kernel has been mapped to KERNELBASE. Therefore all + * OF calls must be done within prom_init(). + * + * ADDR is used in calls to call_prom. The 4th and following + * arguments to call_prom should be 32-bit values. + * On ppc64, 64 bit values are truncated to 32 bits (and + * fortunately don't get interpreted as two arguments). + */ +#define ADDR(x) (u32)(unsigned long)(x) + +#ifdef CONFIG_PPC64 +#define OF_WORKAROUNDS 0 +#else +#define OF_WORKAROUNDS of_workarounds +static int of_workarounds __prombss; +#endif + +#define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */ +#define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */ + +#ifdef DEBUG_PROM +#define prom_debug(x...) prom_printf(x) +#else +#define prom_debug(x...) do { } while (0) +#endif + + +typedef u32 prom_arg_t; + +struct prom_args { + __be32 service; + __be32 nargs; + __be32 nret; + __be32 args[10]; +}; + +struct prom_t { + ihandle root; + phandle chosen; + int cpu; + ihandle stdout; + ihandle mmumap; + ihandle memory; +}; + +struct mem_map_entry { + __be64 base; + __be64 size; +}; + +typedef __be32 cell_t; + +extern void __start(unsigned long r3, unsigned long r4, unsigned long r5, + unsigned long r6, unsigned long r7, unsigned long r8, + unsigned long r9); + +#ifdef CONFIG_PPC64 +extern int enter_prom(struct prom_args *args, unsigned long entry); +#else +static inline int enter_prom(struct prom_args *args, unsigned long entry) +{ + return ((int (*)(struct prom_args *))entry)(args); +} +#endif + +extern void copy_and_flush(unsigned long dest, unsigned long src, + unsigned long size, unsigned long offset); + +/* prom structure */ +static struct prom_t __prombss prom; + +static unsigned long __prombss prom_entry; + +static char __prombss of_stdout_device[256]; +static char __prombss prom_scratch[256]; + +static unsigned long __prombss dt_header_start; +static unsigned long __prombss dt_struct_start, dt_struct_end; +static unsigned long __prombss dt_string_start, dt_string_end; + +static unsigned long __prombss prom_initrd_start, prom_initrd_end; + +#ifdef CONFIG_PPC64 +static int __prombss prom_iommu_force_on; +static int __prombss prom_iommu_off; +static unsigned long __prombss prom_tce_alloc_start; +static unsigned long __prombss prom_tce_alloc_end; +#endif + +#ifdef CONFIG_PPC_PSERIES +static bool __prombss prom_radix_disable; +static bool __prombss prom_radix_gtse_disable; +static bool __prombss prom_xive_disable; +#endif + +#ifdef CONFIG_PPC_SVM +static bool __prombss prom_svm_enable; +#endif + +struct platform_support { + bool hash_mmu; + bool radix_mmu; + bool radix_gtse; + bool xive; +}; + +/* Platforms codes are now obsolete in the kernel. Now only used within this + * file and ultimately gone too. Feel free to change them if you need, they + * are not shared with anything outside of this file anymore + */ +#define PLATFORM_PSERIES 0x0100 +#define PLATFORM_PSERIES_LPAR 0x0101 +#define PLATFORM_LPAR 0x0001 +#define PLATFORM_POWERMAC 0x0400 +#define PLATFORM_GENERIC 0x0500 + +static int __prombss of_platform; + +static char __prombss prom_cmd_line[COMMAND_LINE_SIZE]; + +static unsigned long __prombss prom_memory_limit; + +static unsigned long __prombss alloc_top; +static unsigned long __prombss alloc_top_high; +static unsigned long __prombss alloc_bottom; +static unsigned long __prombss rmo_top; +static unsigned long __prombss ram_top; + +static struct mem_map_entry __prombss mem_reserve_map[MEM_RESERVE_MAP_SIZE]; +static int __prombss mem_reserve_cnt; + +static cell_t __prombss regbuf[1024]; + +static bool __prombss rtas_has_query_cpu_stopped; + + +/* + * Error results ... some OF calls will return "-1" on error, some + * will return 0, some will return either. To simplify, here are + * macros to use with any ihandle or phandle return value to check if + * it is valid + */ + +#define PROM_ERROR (-1u) +#define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR) +#define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR) + +/* Copied from lib/string.c and lib/kstrtox.c */ + +static int __init prom_strcmp(const char *cs, const char *ct) +{ + unsigned char c1, c2; + + while (1) { + c1 = *cs++; + c2 = *ct++; + if (c1 != c2) + return c1 < c2 ? -1 : 1; + if (!c1) + break; + } + return 0; +} + +static ssize_t __init prom_strscpy_pad(char *dest, const char *src, size_t n) +{ + ssize_t rc; + size_t i; + + if (n == 0 || n > INT_MAX) + return -E2BIG; + + // Copy up to n bytes + for (i = 0; i < n && src[i] != '\0'; i++) + dest[i] = src[i]; + + rc = i; + + // If we copied all n then we have run out of space for the nul + if (rc == n) { + // Rewind by one character to ensure nul termination + i--; + rc = -E2BIG; + } + + for (; i < n; i++) + dest[i] = '\0'; + + return rc; +} + +static int __init prom_strncmp(const char *cs, const char *ct, size_t count) +{ + unsigned char c1, c2; + + while (count) { + c1 = *cs++; + c2 = *ct++; + if (c1 != c2) + return c1 < c2 ? -1 : 1; + if (!c1) + break; + count--; + } + return 0; +} + +static size_t __init prom_strlen(const char *s) +{ + const char *sc; + + for (sc = s; *sc != '\0'; ++sc) + /* nothing */; + return sc - s; +} + +static int __init prom_memcmp(const void *cs, const void *ct, size_t count) +{ + const unsigned char *su1, *su2; + int res = 0; + + for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--) + if ((res = *su1 - *su2) != 0) + break; + return res; +} + +static char __init *prom_strstr(const char *s1, const char *s2) +{ + size_t l1, l2; + + l2 = prom_strlen(s2); + if (!l2) + return (char *)s1; + l1 = prom_strlen(s1); + while (l1 >= l2) { + l1--; + if (!prom_memcmp(s1, s2, l2)) + return (char *)s1; + s1++; + } + return NULL; +} + +static size_t __init prom_strlcat(char *dest, const char *src, size_t count) +{ + size_t dsize = prom_strlen(dest); + size_t len = prom_strlen(src); + size_t res = dsize + len; + + /* This would be a bug */ + if (dsize >= count) + return count; + + dest += dsize; + count -= dsize; + if (len >= count) + len = count-1; + memcpy(dest, src, len); + dest[len] = 0; + return res; + +} + +#ifdef CONFIG_PPC_PSERIES +static int __init prom_strtobool(const char *s, bool *res) +{ + if (!s) + return -EINVAL; + + switch (s[0]) { + case 'y': + case 'Y': + case '1': + *res = true; + return 0; + case 'n': + case 'N': + case '0': + *res = false; + return 0; + case 'o': + case 'O': + switch (s[1]) { + case 'n': + case 'N': + *res = true; + return 0; + case 'f': + case 'F': + *res = false; + return 0; + default: + break; + } + break; + default: + break; + } + + return -EINVAL; +} +#endif + +/* This is the one and *ONLY* place where we actually call open + * firmware. + */ + +static int __init call_prom(const char *service, int nargs, int nret, ...) +{ + int i; + struct prom_args args; + va_list list; + + args.service = cpu_to_be32(ADDR(service)); + args.nargs = cpu_to_be32(nargs); + args.nret = cpu_to_be32(nret); + + va_start(list, nret); + for (i = 0; i < nargs; i++) + args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t)); + va_end(list); + + for (i = 0; i < nret; i++) + args.args[nargs+i] = 0; + + if (enter_prom(&args, prom_entry) < 0) + return PROM_ERROR; + + return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0; +} + +static int __init call_prom_ret(const char *service, int nargs, int nret, + prom_arg_t *rets, ...) +{ + int i; + struct prom_args args; + va_list list; + + args.service = cpu_to_be32(ADDR(service)); + args.nargs = cpu_to_be32(nargs); + args.nret = cpu_to_be32(nret); + + va_start(list, rets); + for (i = 0; i < nargs; i++) + args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t)); + va_end(list); + + for (i = 0; i < nret; i++) + args.args[nargs+i] = 0; + + if (enter_prom(&args, prom_entry) < 0) + return PROM_ERROR; + + if (rets != NULL) + for (i = 1; i < nret; ++i) + rets[i-1] = be32_to_cpu(args.args[nargs+i]); + + return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0; +} + + +static void __init prom_print(const char *msg) +{ + const char *p, *q; + + if (prom.stdout == 0) + return; + + for (p = msg; *p != 0; p = q) { + for (q = p; *q != 0 && *q != '\n'; ++q) + ; + if (q > p) + call_prom("write", 3, 1, prom.stdout, p, q - p); + if (*q == 0) + break; + ++q; + call_prom("write", 3, 1, prom.stdout, ADDR("\r\n"), 2); + } +} + + +/* + * Both prom_print_hex & prom_print_dec takes an unsigned long as input so that + * we do not need __udivdi3 or __umoddi3 on 32bits. + */ +static void __init prom_print_hex(unsigned long val) +{ + int i, nibbles = sizeof(val)*2; + char buf[sizeof(val)*2+1]; + + for (i = nibbles-1; i >= 0; i--) { + buf[i] = (val & 0xf) + '0'; + if (buf[i] > '9') + buf[i] += ('a'-'0'-10); + val >>= 4; + } + buf[nibbles] = '\0'; + call_prom("write", 3, 1, prom.stdout, buf, nibbles); +} + +/* max number of decimal digits in an unsigned long */ +#define UL_DIGITS 21 +static void __init prom_print_dec(unsigned long val) +{ + int i, size; + char buf[UL_DIGITS+1]; + + for (i = UL_DIGITS-1; i >= 0; i--) { + buf[i] = (val % 10) + '0'; + val = val/10; + if (val == 0) + break; + } + /* shift stuff down */ + size = UL_DIGITS - i; + call_prom("write", 3, 1, prom.stdout, buf+i, size); +} + +__printf(1, 2) +static void __init prom_printf(const char *format, ...) +{ + const char *p, *q, *s; + va_list args; + unsigned long v; + long vs; + int n = 0; + + va_start(args, format); + for (p = format; *p != 0; p = q) { + for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q) + ; + if (q > p) + call_prom("write", 3, 1, prom.stdout, p, q - p); + if (*q == 0) + break; + if (*q == '\n') { + ++q; + call_prom("write", 3, 1, prom.stdout, + ADDR("\r\n"), 2); + continue; + } + ++q; + if (*q == 0) + break; + while (*q == 'l') { + ++q; + ++n; + } + switch (*q) { + case 's': + ++q; + s = va_arg(args, const char *); + prom_print(s); + break; + case 'x': + ++q; + switch (n) { + case 0: + v = va_arg(args, unsigned int); + break; + case 1: + v = va_arg(args, unsigned long); + break; + case 2: + default: + v = va_arg(args, unsigned long long); + break; + } + prom_print_hex(v); + break; + case 'u': + ++q; + switch (n) { + case 0: + v = va_arg(args, unsigned int); + break; + case 1: + v = va_arg(args, unsigned long); + break; + case 2: + default: + v = va_arg(args, unsigned long long); + break; + } + prom_print_dec(v); + break; + case 'd': + ++q; + switch (n) { + case 0: + vs = va_arg(args, int); + break; + case 1: + vs = va_arg(args, long); + break; + case 2: + default: + vs = va_arg(args, long long); + break; + } + if (vs < 0) { + prom_print("-"); + vs = -vs; + } + prom_print_dec(vs); + break; + } + } + va_end(args); +} + + +static unsigned int __init prom_claim(unsigned long virt, unsigned long size, + unsigned long align) +{ + + if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) { + /* + * Old OF requires we claim physical and virtual separately + * and then map explicitly (assuming virtual mode) + */ + int ret; + prom_arg_t result; + + ret = call_prom_ret("call-method", 5, 2, &result, + ADDR("claim"), prom.memory, + align, size, virt); + if (ret != 0 || result == -1) + return -1; + ret = call_prom_ret("call-method", 5, 2, &result, + ADDR("claim"), prom.mmumap, + align, size, virt); + if (ret != 0) { + call_prom("call-method", 4, 1, ADDR("release"), + prom.memory, size, virt); + return -1; + } + /* the 0x12 is M (coherence) + PP == read/write */ + call_prom("call-method", 6, 1, + ADDR("map"), prom.mmumap, 0x12, size, virt, virt); + return virt; + } + return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size, + (prom_arg_t)align); +} + +static void __init __attribute__((noreturn)) prom_panic(const char *reason) +{ + prom_print(reason); + /* Do not call exit because it clears the screen on pmac + * it also causes some sort of double-fault on early pmacs */ + if (of_platform == PLATFORM_POWERMAC) + asm("trap\n"); + + /* ToDo: should put up an SRC here on pSeries */ + call_prom("exit", 0, 0); + + for (;;) /* should never get here */ + ; +} + + +static int __init prom_next_node(phandle *nodep) +{ + phandle node; + + if ((node = *nodep) != 0 + && (*nodep = call_prom("child", 1, 1, node)) != 0) + return 1; + if ((*nodep = call_prom("peer", 1, 1, node)) != 0) + return 1; + for (;;) { + if ((node = call_prom("parent", 1, 1, node)) == 0) + return 0; + if ((*nodep = call_prom("peer", 1, 1, node)) != 0) + return 1; + } +} + +static inline int __init prom_getprop(phandle node, const char *pname, + void *value, size_t valuelen) +{ + return call_prom("getprop", 4, 1, node, ADDR(pname), + (u32)(unsigned long) value, (u32) valuelen); +} + +static inline int __init prom_getproplen(phandle node, const char *pname) +{ + return call_prom("getproplen", 2, 1, node, ADDR(pname)); +} + +static void __init add_string(char **str, const char *q) +{ + char *p = *str; + + while (*q) + *p++ = *q++; + *p++ = ' '; + *str = p; +} + +static char *__init tohex(unsigned int x) +{ + static const char digits[] __initconst = "0123456789abcdef"; + static char result[9] __prombss; + int i; + + result[8] = 0; + i = 8; + do { + --i; + result[i] = digits[x & 0xf]; + x >>= 4; + } while (x != 0 && i > 0); + return &result[i]; +} + +static int __init prom_setprop(phandle node, const char *nodename, + const char *pname, void *value, size_t valuelen) +{ + char cmd[256], *p; + + if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL)) + return call_prom("setprop", 4, 1, node, ADDR(pname), + (u32)(unsigned long) value, (u32) valuelen); + + /* gah... setprop doesn't work on longtrail, have to use interpret */ + p = cmd; + add_string(&p, "dev"); + add_string(&p, nodename); + add_string(&p, tohex((u32)(unsigned long) value)); + add_string(&p, tohex(valuelen)); + add_string(&p, tohex(ADDR(pname))); + add_string(&p, tohex(prom_strlen(pname))); + add_string(&p, "property"); + *p = 0; + return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd); +} + +/* We can't use the standard versions because of relocation headaches. */ +#define prom_isxdigit(c) \ + (('0' <= (c) && (c) <= '9') || ('a' <= (c) && (c) <= 'f') || ('A' <= (c) && (c) <= 'F')) + +#define prom_isdigit(c) ('0' <= (c) && (c) <= '9') +#define prom_islower(c) ('a' <= (c) && (c) <= 'z') +#define prom_toupper(c) (prom_islower(c) ? ((c) - 'a' + 'A') : (c)) + +static unsigned long __init prom_strtoul(const char *cp, const char **endp) +{ + unsigned long result = 0, base = 10, value; + + if (*cp == '0') { + base = 8; + cp++; + if (prom_toupper(*cp) == 'X') { + cp++; + base = 16; + } + } + + while (prom_isxdigit(*cp) && + (value = prom_isdigit(*cp) ? *cp - '0' : prom_toupper(*cp) - 'A' + 10) < base) { + result = result * base + value; + cp++; + } + + if (endp) + *endp = cp; + + return result; +} + +static unsigned long __init prom_memparse(const char *ptr, const char **retptr) +{ + unsigned long ret = prom_strtoul(ptr, retptr); + int shift = 0; + + /* + * We can't use a switch here because GCC *may* generate a + * jump table which won't work, because we're not running at + * the address we're linked at. + */ + if ('G' == **retptr || 'g' == **retptr) + shift = 30; + + if ('M' == **retptr || 'm' == **retptr) + shift = 20; + + if ('K' == **retptr || 'k' == **retptr) + shift = 10; + + if (shift) { + ret <<= shift; + (*retptr)++; + } + + return ret; +} + +/* + * Early parsing of the command line passed to the kernel, used for + * "mem=x" and the options that affect the iommu + */ +static void __init early_cmdline_parse(void) +{ + const char *opt; + + char *p; + int l = 0; + + prom_cmd_line[0] = 0; + p = prom_cmd_line; + + if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && (long)prom.chosen > 0) + l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1); + + if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) || l <= 0 || p[0] == '\0') + prom_strlcat(prom_cmd_line, " " CONFIG_CMDLINE, + sizeof(prom_cmd_line)); + + prom_printf("command line: %s\n", prom_cmd_line); + +#ifdef CONFIG_PPC64 + opt = prom_strstr(prom_cmd_line, "iommu="); + if (opt) { + prom_printf("iommu opt is: %s\n", opt); + opt += 6; + while (*opt && *opt == ' ') + opt++; + if (!prom_strncmp(opt, "off", 3)) + prom_iommu_off = 1; + else if (!prom_strncmp(opt, "force", 5)) + prom_iommu_force_on = 1; + } +#endif + opt = prom_strstr(prom_cmd_line, "mem="); + if (opt) { + opt += 4; + prom_memory_limit = prom_memparse(opt, (const char **)&opt); +#ifdef CONFIG_PPC64 + /* Align to 16 MB == size of ppc64 large page */ + prom_memory_limit = ALIGN(prom_memory_limit, 0x1000000); +#endif + } + +#ifdef CONFIG_PPC_PSERIES + prom_radix_disable = !IS_ENABLED(CONFIG_PPC_RADIX_MMU_DEFAULT); + opt = prom_strstr(prom_cmd_line, "disable_radix"); + if (opt) { + opt += 13; + if (*opt && *opt == '=') { + bool val; + + if (prom_strtobool(++opt, &val)) + prom_radix_disable = false; + else + prom_radix_disable = val; + } else + prom_radix_disable = true; + } + if (prom_radix_disable) + prom_debug("Radix disabled from cmdline\n"); + + opt = prom_strstr(prom_cmd_line, "radix_hcall_invalidate=on"); + if (opt) { + prom_radix_gtse_disable = true; + prom_debug("Radix GTSE disabled from cmdline\n"); + } + + opt = prom_strstr(prom_cmd_line, "xive=off"); + if (opt) { + prom_xive_disable = true; + prom_debug("XIVE disabled from cmdline\n"); + } +#endif /* CONFIG_PPC_PSERIES */ + +#ifdef CONFIG_PPC_SVM + opt = prom_strstr(prom_cmd_line, "svm="); + if (opt) { + bool val; + + opt += sizeof("svm=") - 1; + if (!prom_strtobool(opt, &val)) + prom_svm_enable = val; + } +#endif /* CONFIG_PPC_SVM */ +} + +#ifdef CONFIG_PPC_PSERIES +/* + * The architecture vector has an array of PVR mask/value pairs, + * followed by # option vectors - 1, followed by the option vectors. + * + * See prom.h for the definition of the bits specified in the + * architecture vector. + */ + +/* Firmware expects the value to be n - 1, where n is the # of vectors */ +#define NUM_VECTORS(n) ((n) - 1) + +/* + * Firmware expects 1 + n - 2, where n is the length of the option vector in + * bytes. The 1 accounts for the length byte itself, the - 2 .. ? + */ +#define VECTOR_LENGTH(n) (1 + (n) - 2) + +struct option_vector1 { + u8 byte1; + u8 arch_versions; + u8 arch_versions3; +} __packed; + +struct option_vector2 { + u8 byte1; + __be16 reserved; + __be32 real_base; + __be32 real_size; + __be32 virt_base; + __be32 virt_size; + __be32 load_base; + __be32 min_rma; + __be32 min_load; + u8 min_rma_percent; + u8 max_pft_size; +} __packed; + +struct option_vector3 { + u8 byte1; + u8 byte2; +} __packed; + +struct option_vector4 { + u8 byte1; + u8 min_vp_cap; +} __packed; + +struct option_vector5 { + u8 byte1; + u8 byte2; + u8 byte3; + u8 cmo; + u8 associativity; + u8 bin_opts; + u8 micro_checkpoint; + u8 reserved0; + __be32 max_cpus; + __be16 papr_level; + __be16 reserved1; + u8 platform_facilities; + u8 reserved2; + __be16 reserved3; + u8 subprocessors; + u8 byte22; + u8 intarch; + u8 mmu; + u8 hash_ext; + u8 radix_ext; +} __packed; + +struct option_vector6 { + u8 reserved; + u8 secondary_pteg; + u8 os_name; +} __packed; + +struct option_vector7 { + u8 os_id[256]; +} __packed; + +struct ibm_arch_vec { + struct { u32 mask, val; } pvrs[14]; + + u8 num_vectors; + + u8 vec1_len; + struct option_vector1 vec1; + + u8 vec2_len; + struct option_vector2 vec2; + + u8 vec3_len; + struct option_vector3 vec3; + + u8 vec4_len; + struct option_vector4 vec4; + + u8 vec5_len; + struct option_vector5 vec5; + + u8 vec6_len; + struct option_vector6 vec6; + + u8 vec7_len; + struct option_vector7 vec7; +} __packed; + +static const struct ibm_arch_vec ibm_architecture_vec_template __initconst = { + .pvrs = { + { + .mask = cpu_to_be32(0xfffe0000), /* POWER5/POWER5+ */ + .val = cpu_to_be32(0x003a0000), + }, + { + .mask = cpu_to_be32(0xffff0000), /* POWER6 */ + .val = cpu_to_be32(0x003e0000), + }, + { + .mask = cpu_to_be32(0xffff0000), /* POWER7 */ + .val = cpu_to_be32(0x003f0000), + }, + { + .mask = cpu_to_be32(0xffff0000), /* POWER8E */ + .val = cpu_to_be32(0x004b0000), + }, + { + .mask = cpu_to_be32(0xffff0000), /* POWER8NVL */ + .val = cpu_to_be32(0x004c0000), + }, + { + .mask = cpu_to_be32(0xffff0000), /* POWER8 */ + .val = cpu_to_be32(0x004d0000), + }, + { + .mask = cpu_to_be32(0xffff0000), /* POWER9 */ + .val = cpu_to_be32(0x004e0000), + }, + { + .mask = cpu_to_be32(0xffff0000), /* POWER10 */ + .val = cpu_to_be32(0x00800000), + }, + { + .mask = cpu_to_be32(0xffffffff), /* all 3.1-compliant */ + .val = cpu_to_be32(0x0f000006), + }, + { + .mask = cpu_to_be32(0xffffffff), /* all 3.00-compliant */ + .val = cpu_to_be32(0x0f000005), + }, + { + .mask = cpu_to_be32(0xffffffff), /* all 2.07-compliant */ + .val = cpu_to_be32(0x0f000004), + }, + { + .mask = cpu_to_be32(0xffffffff), /* all 2.06-compliant */ + .val = cpu_to_be32(0x0f000003), + }, + { + .mask = cpu_to_be32(0xffffffff), /* all 2.05-compliant */ + .val = cpu_to_be32(0x0f000002), + }, + { + .mask = cpu_to_be32(0xfffffffe), /* all 2.04-compliant and earlier */ + .val = cpu_to_be32(0x0f000001), + }, + }, + + .num_vectors = NUM_VECTORS(6), + + .vec1_len = VECTOR_LENGTH(sizeof(struct option_vector1)), + .vec1 = { + .byte1 = 0, + .arch_versions = OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 | + OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07, + .arch_versions3 = OV1_PPC_3_00 | OV1_PPC_3_1, + }, + + .vec2_len = VECTOR_LENGTH(sizeof(struct option_vector2)), + /* option vector 2: Open Firmware options supported */ + .vec2 = { + .byte1 = OV2_REAL_MODE, + .reserved = 0, + .real_base = cpu_to_be32(0xffffffff), + .real_size = cpu_to_be32(0xffffffff), + .virt_base = cpu_to_be32(0xffffffff), + .virt_size = cpu_to_be32(0xffffffff), + .load_base = cpu_to_be32(0xffffffff), + .min_rma = cpu_to_be32(512), /* 512MB min RMA */ + .min_load = cpu_to_be32(0xffffffff), /* full client load */ + .min_rma_percent = 0, /* min RMA percentage of total RAM */ + .max_pft_size = 48, /* max log_2(hash table size) */ + }, + + .vec3_len = VECTOR_LENGTH(sizeof(struct option_vector3)), + /* option vector 3: processor options supported */ + .vec3 = { + .byte1 = 0, /* don't ignore, don't halt */ + .byte2 = OV3_FP | OV3_VMX | OV3_DFP, + }, + + .vec4_len = VECTOR_LENGTH(sizeof(struct option_vector4)), + /* option vector 4: IBM PAPR implementation */ + .vec4 = { + .byte1 = 0, /* don't halt */ + .min_vp_cap = OV4_MIN_ENT_CAP, /* minimum VP entitled capacity */ + }, + + .vec5_len = VECTOR_LENGTH(sizeof(struct option_vector5)), + /* option vector 5: PAPR/OF options */ + .vec5 = { + .byte1 = 0, /* don't ignore, don't halt */ + .byte2 = OV5_FEAT(OV5_LPAR) | OV5_FEAT(OV5_SPLPAR) | OV5_FEAT(OV5_LARGE_PAGES) | + OV5_FEAT(OV5_DRCONF_MEMORY) | OV5_FEAT(OV5_DONATE_DEDICATE_CPU) | +#ifdef CONFIG_PCI_MSI + /* PCIe/MSI support. Without MSI full PCIe is not supported */ + OV5_FEAT(OV5_MSI), +#else + 0, +#endif + .byte3 = 0, + .cmo = +#ifdef CONFIG_PPC_SMLPAR + OV5_FEAT(OV5_CMO) | OV5_FEAT(OV5_XCMO), +#else + 0, +#endif + .associativity = OV5_FEAT(OV5_FORM1_AFFINITY) | OV5_FEAT(OV5_PRRN) | + OV5_FEAT(OV5_FORM2_AFFINITY), + .bin_opts = OV5_FEAT(OV5_RESIZE_HPT) | OV5_FEAT(OV5_HP_EVT), + .micro_checkpoint = 0, + .reserved0 = 0, + .max_cpus = cpu_to_be32(NR_CPUS), /* number of cores supported */ + .papr_level = 0, + .reserved1 = 0, + .platform_facilities = OV5_FEAT(OV5_PFO_HW_RNG) | OV5_FEAT(OV5_PFO_HW_ENCR) | OV5_FEAT(OV5_PFO_HW_842), + .reserved2 = 0, + .reserved3 = 0, + .subprocessors = 1, + .byte22 = OV5_FEAT(OV5_DRMEM_V2) | OV5_FEAT(OV5_DRC_INFO), + .intarch = 0, + .mmu = 0, + .hash_ext = 0, + .radix_ext = 0, + }, + + /* option vector 6: IBM PAPR hints */ + .vec6_len = VECTOR_LENGTH(sizeof(struct option_vector6)), + .vec6 = { + .reserved = 0, + .secondary_pteg = 0, + .os_name = OV6_LINUX, + }, + + /* option vector 7: OS Identification */ + .vec7_len = VECTOR_LENGTH(sizeof(struct option_vector7)), +}; + +static struct ibm_arch_vec __prombss ibm_architecture_vec ____cacheline_aligned; + +/* Old method - ELF header with PT_NOTE sections only works on BE */ +#ifdef __BIG_ENDIAN__ +static const struct fake_elf { + Elf32_Ehdr elfhdr; + Elf32_Phdr phdr[2]; + struct chrpnote { + u32 namesz; + u32 descsz; + u32 type; + char name[8]; /* "PowerPC" */ + struct chrpdesc { + u32 real_mode; + u32 real_base; + u32 real_size; + u32 virt_base; + u32 virt_size; + u32 load_base; + } chrpdesc; + } chrpnote; + struct rpanote { + u32 namesz; + u32 descsz; + u32 type; + char name[24]; /* "IBM,RPA-Client-Config" */ + struct rpadesc { + u32 lpar_affinity; + u32 min_rmo_size; + u32 min_rmo_percent; + u32 max_pft_size; + u32 splpar; + u32 min_load; + u32 new_mem_def; + u32 ignore_me; + } rpadesc; + } rpanote; +} fake_elf __initconst = { + .elfhdr = { + .e_ident = { 0x7f, 'E', 'L', 'F', + ELFCLASS32, ELFDATA2MSB, EV_CURRENT }, + .e_type = ET_EXEC, /* yeah right */ + .e_machine = EM_PPC, + .e_version = EV_CURRENT, + .e_phoff = offsetof(struct fake_elf, phdr), + .e_phentsize = sizeof(Elf32_Phdr), + .e_phnum = 2 + }, + .phdr = { + [0] = { + .p_type = PT_NOTE, + .p_offset = offsetof(struct fake_elf, chrpnote), + .p_filesz = sizeof(struct chrpnote) + }, [1] = { + .p_type = PT_NOTE, + .p_offset = offsetof(struct fake_elf, rpanote), + .p_filesz = sizeof(struct rpanote) + } + }, + .chrpnote = { + .namesz = sizeof("PowerPC"), + .descsz = sizeof(struct chrpdesc), + .type = 0x1275, + .name = "PowerPC", + .chrpdesc = { + .real_mode = ~0U, /* ~0 means "don't care" */ + .real_base = ~0U, + .real_size = ~0U, + .virt_base = ~0U, + .virt_size = ~0U, + .load_base = ~0U + }, + }, + .rpanote = { + .namesz = sizeof("IBM,RPA-Client-Config"), + .descsz = sizeof(struct rpadesc), + .type = 0x12759999, + .name = "IBM,RPA-Client-Config", + .rpadesc = { + .lpar_affinity = 0, + .min_rmo_size = 64, /* in megabytes */ + .min_rmo_percent = 0, + .max_pft_size = 48, /* 2^48 bytes max PFT size */ + .splpar = 1, + .min_load = ~0U, + .new_mem_def = 0 + } + } +}; +#endif /* __BIG_ENDIAN__ */ + +static int __init prom_count_smt_threads(void) +{ + phandle node; + char type[64]; + unsigned int plen; + + /* Pick up th first CPU node we can find */ + for (node = 0; prom_next_node(&node); ) { + type[0] = 0; + prom_getprop(node, "device_type", type, sizeof(type)); + + if (prom_strcmp(type, "cpu")) + continue; + /* + * There is an entry for each smt thread, each entry being + * 4 bytes long. All cpus should have the same number of + * smt threads, so return after finding the first. + */ + plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s"); + if (plen == PROM_ERROR) + break; + plen >>= 2; + prom_debug("Found %lu smt threads per core\n", (unsigned long)plen); + + /* Sanity check */ + if (plen < 1 || plen > 64) { + prom_printf("Threads per core %lu out of bounds, assuming 1\n", + (unsigned long)plen); + return 1; + } + return plen; + } + prom_debug("No threads found, assuming 1 per core\n"); + + return 1; + +} + +static void __init prom_parse_mmu_model(u8 val, + struct platform_support *support) +{ + switch (val) { + case OV5_FEAT(OV5_MMU_DYNAMIC): + case OV5_FEAT(OV5_MMU_EITHER): /* Either Available */ + prom_debug("MMU - either supported\n"); + support->radix_mmu = !prom_radix_disable; + support->hash_mmu = true; + break; + case OV5_FEAT(OV5_MMU_RADIX): /* Only Radix */ + prom_debug("MMU - radix only\n"); + if (prom_radix_disable) { + /* + * If we __have__ to do radix, we're better off ignoring + * the command line rather than not booting. + */ + prom_printf("WARNING: Ignoring cmdline option disable_radix\n"); + } + support->radix_mmu = true; + break; + case OV5_FEAT(OV5_MMU_HASH): + prom_debug("MMU - hash only\n"); + support->hash_mmu = true; + break; + default: + prom_debug("Unknown mmu support option: 0x%x\n", val); + break; + } +} + +static void __init prom_parse_xive_model(u8 val, + struct platform_support *support) +{ + switch (val) { + case OV5_FEAT(OV5_XIVE_EITHER): /* Either Available */ + prom_debug("XIVE - either mode supported\n"); + support->xive = !prom_xive_disable; + break; + case OV5_FEAT(OV5_XIVE_EXPLOIT): /* Only Exploitation mode */ + prom_debug("XIVE - exploitation mode supported\n"); + if (prom_xive_disable) { + /* + * If we __have__ to do XIVE, we're better off ignoring + * the command line rather than not booting. + */ + prom_printf("WARNING: Ignoring cmdline option xive=off\n"); + } + support->xive = true; + break; + case OV5_FEAT(OV5_XIVE_LEGACY): /* Only Legacy mode */ + prom_debug("XIVE - legacy mode supported\n"); + break; + default: + prom_debug("Unknown xive support option: 0x%x\n", val); + break; + } +} + +static void __init prom_parse_platform_support(u8 index, u8 val, + struct platform_support *support) +{ + switch (index) { + case OV5_INDX(OV5_MMU_SUPPORT): /* MMU Model */ + prom_parse_mmu_model(val & OV5_FEAT(OV5_MMU_SUPPORT), support); + break; + case OV5_INDX(OV5_RADIX_GTSE): /* Radix Extensions */ + if (val & OV5_FEAT(OV5_RADIX_GTSE)) + support->radix_gtse = !prom_radix_gtse_disable; + break; + case OV5_INDX(OV5_XIVE_SUPPORT): /* Interrupt mode */ + prom_parse_xive_model(val & OV5_FEAT(OV5_XIVE_SUPPORT), + support); + break; + } +} + +static void __init prom_check_platform_support(void) +{ + struct platform_support supported = { + .hash_mmu = false, + .radix_mmu = false, + .radix_gtse = false, + .xive = false + }; + int prop_len = prom_getproplen(prom.chosen, + "ibm,arch-vec-5-platform-support"); + + /* + * First copy the architecture vec template + * + * use memcpy() instead of *vec = *vec_template so that GCC replaces it + * by __memcpy() when KASAN is active + */ + memcpy(&ibm_architecture_vec, &ibm_architecture_vec_template, + sizeof(ibm_architecture_vec)); + + prom_strscpy_pad(ibm_architecture_vec.vec7.os_id, linux_banner, 256); + + if (prop_len > 1) { + int i; + u8 vec[8]; + prom_debug("Found ibm,arch-vec-5-platform-support, len: %d\n", + prop_len); + if (prop_len > sizeof(vec)) + prom_printf("WARNING: ibm,arch-vec-5-platform-support longer than expected (len: %d)\n", + prop_len); + prom_getprop(prom.chosen, "ibm,arch-vec-5-platform-support", &vec, sizeof(vec)); + for (i = 0; i < prop_len; i += 2) { + prom_debug("%d: index = 0x%x val = 0x%x\n", i / 2, vec[i], vec[i + 1]); + prom_parse_platform_support(vec[i], vec[i + 1], &supported); + } + } + + if (supported.radix_mmu && IS_ENABLED(CONFIG_PPC_RADIX_MMU)) { + /* Radix preferred - Check if GTSE is also supported */ + prom_debug("Asking for radix\n"); + ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_RADIX); + if (supported.radix_gtse) + ibm_architecture_vec.vec5.radix_ext = + OV5_FEAT(OV5_RADIX_GTSE); + else + prom_debug("Radix GTSE isn't supported\n"); + } else if (supported.hash_mmu) { + /* Default to hash mmu (if we can) */ + prom_debug("Asking for hash\n"); + ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_HASH); + } else { + /* We're probably on a legacy hypervisor */ + prom_debug("Assuming legacy hash support\n"); + } + + if (supported.xive) { + prom_debug("Asking for XIVE\n"); + ibm_architecture_vec.vec5.intarch = OV5_FEAT(OV5_XIVE_EXPLOIT); + } +} + +static void __init prom_send_capabilities(void) +{ + ihandle root; + prom_arg_t ret; + u32 cores; + + /* Check ibm,arch-vec-5-platform-support and fixup vec5 if required */ + prom_check_platform_support(); + + root = call_prom("open", 1, 1, ADDR("/")); + if (root != 0) { + /* We need to tell the FW about the number of cores we support. + * + * To do that, we count the number of threads on the first core + * (we assume this is the same for all cores) and use it to + * divide NR_CPUS. + */ + + cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads()); + prom_printf("Max number of cores passed to firmware: %u (NR_CPUS = %d)\n", + cores, NR_CPUS); + + ibm_architecture_vec.vec5.max_cpus = cpu_to_be32(cores); + + /* try calling the ibm,client-architecture-support method */ + prom_printf("Calling ibm,client-architecture-support..."); + if (call_prom_ret("call-method", 3, 2, &ret, + ADDR("ibm,client-architecture-support"), + root, + ADDR(&ibm_architecture_vec)) == 0) { + /* the call exists... */ + if (ret) + prom_printf("\nWARNING: ibm,client-architecture" + "-support call FAILED!\n"); + call_prom("close", 1, 0, root); + prom_printf(" done\n"); + return; + } + call_prom("close", 1, 0, root); + prom_printf(" not implemented\n"); + } + +#ifdef __BIG_ENDIAN__ + { + ihandle elfloader; + + /* no ibm,client-architecture-support call, try the old way */ + elfloader = call_prom("open", 1, 1, + ADDR("/packages/elf-loader")); + if (elfloader == 0) { + prom_printf("couldn't open /packages/elf-loader\n"); + return; + } + call_prom("call-method", 3, 1, ADDR("process-elf-header"), + elfloader, ADDR(&fake_elf)); + call_prom("close", 1, 0, elfloader); + } +#endif /* __BIG_ENDIAN__ */ +} +#endif /* CONFIG_PPC_PSERIES */ + +/* + * Memory allocation strategy... our layout is normally: + * + * at 14Mb or more we have vmlinux, then a gap and initrd. In some + * rare cases, initrd might end up being before the kernel though. + * We assume this won't override the final kernel at 0, we have no + * provision to handle that in this version, but it should hopefully + * never happen. + * + * alloc_top is set to the top of RMO, eventually shrink down if the + * TCEs overlap + * + * alloc_bottom is set to the top of kernel/initrd + * + * from there, allocations are done this way : rtas is allocated + * topmost, and the device-tree is allocated from the bottom. We try + * to grow the device-tree allocation as we progress. If we can't, + * then we fail, we don't currently have a facility to restart + * elsewhere, but that shouldn't be necessary. + * + * Note that calls to reserve_mem have to be done explicitly, memory + * allocated with either alloc_up or alloc_down isn't automatically + * reserved. + */ + + +/* + * Allocates memory in the RMO upward from the kernel/initrd + * + * When align is 0, this is a special case, it means to allocate in place + * at the current location of alloc_bottom or fail (that is basically + * extending the previous allocation). Used for the device-tree flattening + */ +static unsigned long __init alloc_up(unsigned long size, unsigned long align) +{ + unsigned long base = alloc_bottom; + unsigned long addr = 0; + + if (align) + base = ALIGN(base, align); + prom_debug("%s(%lx, %lx)\n", __func__, size, align); + if (ram_top == 0) + prom_panic("alloc_up() called with mem not initialized\n"); + + if (align) + base = ALIGN(alloc_bottom, align); + else + base = alloc_bottom; + + for(; (base + size) <= alloc_top; + base = ALIGN(base + 0x100000, align)) { + prom_debug(" trying: 0x%lx\n\r", base); + addr = (unsigned long)prom_claim(base, size, 0); + if (addr != PROM_ERROR && addr != 0) + break; + addr = 0; + if (align == 0) + break; + } + if (addr == 0) + return 0; + alloc_bottom = addr + size; + + prom_debug(" -> %lx\n", addr); + prom_debug(" alloc_bottom : %lx\n", alloc_bottom); + prom_debug(" alloc_top : %lx\n", alloc_top); + prom_debug(" alloc_top_hi : %lx\n", alloc_top_high); + prom_debug(" rmo_top : %lx\n", rmo_top); + prom_debug(" ram_top : %lx\n", ram_top); + + return addr; +} + +/* + * Allocates memory downward, either from top of RMO, or if highmem + * is set, from the top of RAM. Note that this one doesn't handle + * failures. It does claim memory if highmem is not set. + */ +static unsigned long __init alloc_down(unsigned long size, unsigned long align, + int highmem) +{ + unsigned long base, addr = 0; + + prom_debug("%s(%lx, %lx, %s)\n", __func__, size, align, + highmem ? "(high)" : "(low)"); + if (ram_top == 0) + prom_panic("alloc_down() called with mem not initialized\n"); + + if (highmem) { + /* Carve out storage for the TCE table. */ + addr = ALIGN_DOWN(alloc_top_high - size, align); + if (addr <= alloc_bottom) + return 0; + /* Will we bump into the RMO ? If yes, check out that we + * didn't overlap existing allocations there, if we did, + * we are dead, we must be the first in town ! + */ + if (addr < rmo_top) { + /* Good, we are first */ + if (alloc_top == rmo_top) + alloc_top = rmo_top = addr; + else + return 0; + } + alloc_top_high = addr; + goto bail; + } + + base = ALIGN_DOWN(alloc_top - size, align); + for (; base > alloc_bottom; + base = ALIGN_DOWN(base - 0x100000, align)) { + prom_debug(" trying: 0x%lx\n\r", base); + addr = (unsigned long)prom_claim(base, size, 0); + if (addr != PROM_ERROR && addr != 0) + break; + addr = 0; + } + if (addr == 0) + return 0; + alloc_top = addr; + + bail: + prom_debug(" -> %lx\n", addr); + prom_debug(" alloc_bottom : %lx\n", alloc_bottom); + prom_debug(" alloc_top : %lx\n", alloc_top); + prom_debug(" alloc_top_hi : %lx\n", alloc_top_high); + prom_debug(" rmo_top : %lx\n", rmo_top); + prom_debug(" ram_top : %lx\n", ram_top); + + return addr; +} + +/* + * Parse a "reg" cell + */ +static unsigned long __init prom_next_cell(int s, cell_t **cellp) +{ + cell_t *p = *cellp; + unsigned long r = 0; + + /* Ignore more than 2 cells */ + while (s > sizeof(unsigned long) / 4) { + p++; + s--; + } + r = be32_to_cpu(*p++); +#ifdef CONFIG_PPC64 + if (s > 1) { + r <<= 32; + r |= be32_to_cpu(*(p++)); + } +#endif + *cellp = p; + return r; +} + +/* + * Very dumb function for adding to the memory reserve list, but + * we don't need anything smarter at this point + * + * XXX Eventually check for collisions. They should NEVER happen. + * If problems seem to show up, it would be a good start to track + * them down. + */ +static void __init reserve_mem(u64 base, u64 size) +{ + u64 top = base + size; + unsigned long cnt = mem_reserve_cnt; + + if (size == 0) + return; + + /* We need to always keep one empty entry so that we + * have our terminator with "size" set to 0 since we are + * dumb and just copy this entire array to the boot params + */ + base = ALIGN_DOWN(base, PAGE_SIZE); + top = ALIGN(top, PAGE_SIZE); + size = top - base; + + if (cnt >= (MEM_RESERVE_MAP_SIZE - 1)) + prom_panic("Memory reserve map exhausted !\n"); + mem_reserve_map[cnt].base = cpu_to_be64(base); + mem_reserve_map[cnt].size = cpu_to_be64(size); + mem_reserve_cnt = cnt + 1; +} + +/* + * Initialize memory allocation mechanism, parse "memory" nodes and + * obtain that way the top of memory and RMO to setup out local allocator + */ +static void __init prom_init_mem(void) +{ + phandle node; + char type[64]; + unsigned int plen; + cell_t *p, *endp; + __be32 val; + u32 rac, rsc; + + /* + * We iterate the memory nodes to find + * 1) top of RMO (first node) + * 2) top of memory + */ + val = cpu_to_be32(2); + prom_getprop(prom.root, "#address-cells", &val, sizeof(val)); + rac = be32_to_cpu(val); + val = cpu_to_be32(1); + prom_getprop(prom.root, "#size-cells", &val, sizeof(rsc)); + rsc = be32_to_cpu(val); + prom_debug("root_addr_cells: %x\n", rac); + prom_debug("root_size_cells: %x\n", rsc); + + prom_debug("scanning memory:\n"); + + for (node = 0; prom_next_node(&node); ) { + type[0] = 0; + prom_getprop(node, "device_type", type, sizeof(type)); + + if (type[0] == 0) { + /* + * CHRP Longtrail machines have no device_type + * on the memory node, so check the name instead... + */ + prom_getprop(node, "name", type, sizeof(type)); + } + if (prom_strcmp(type, "memory")) + continue; + + plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf)); + if (plen > sizeof(regbuf)) { + prom_printf("memory node too large for buffer !\n"); + plen = sizeof(regbuf); + } + p = regbuf; + endp = p + (plen / sizeof(cell_t)); + +#ifdef DEBUG_PROM + memset(prom_scratch, 0, sizeof(prom_scratch)); + call_prom("package-to-path", 3, 1, node, prom_scratch, + sizeof(prom_scratch) - 1); + prom_debug(" node %s :\n", prom_scratch); +#endif /* DEBUG_PROM */ + + while ((endp - p) >= (rac + rsc)) { + unsigned long base, size; + + base = prom_next_cell(rac, &p); + size = prom_next_cell(rsc, &p); + + if (size == 0) + continue; + prom_debug(" %lx %lx\n", base, size); + if (base == 0 && (of_platform & PLATFORM_LPAR)) + rmo_top = size; + if ((base + size) > ram_top) + ram_top = base + size; + } + } + + alloc_bottom = PAGE_ALIGN((unsigned long)&_end + 0x4000); + + /* + * If prom_memory_limit is set we reduce the upper limits *except* for + * alloc_top_high. This must be the real top of RAM so we can put + * TCE's up there. + */ + + alloc_top_high = ram_top; + + if (prom_memory_limit) { + if (prom_memory_limit <= alloc_bottom) { + prom_printf("Ignoring mem=%lx <= alloc_bottom.\n", + prom_memory_limit); + prom_memory_limit = 0; + } else if (prom_memory_limit >= ram_top) { + prom_printf("Ignoring mem=%lx >= ram_top.\n", + prom_memory_limit); + prom_memory_limit = 0; + } else { + ram_top = prom_memory_limit; + rmo_top = min(rmo_top, prom_memory_limit); + } + } + + /* + * Setup our top alloc point, that is top of RMO or top of + * segment 0 when running non-LPAR. + * Some RS64 machines have buggy firmware where claims up at + * 1GB fail. Cap at 768MB as a workaround. + * Since 768MB is plenty of room, and we need to cap to something + * reasonable on 32-bit, cap at 768MB on all machines. + */ + if (!rmo_top) + rmo_top = ram_top; + rmo_top = min(0x30000000ul, rmo_top); + alloc_top = rmo_top; + alloc_top_high = ram_top; + + /* + * Check if we have an initrd after the kernel but still inside + * the RMO. If we do move our bottom point to after it. + */ + if (prom_initrd_start && + prom_initrd_start < rmo_top && + prom_initrd_end > alloc_bottom) + alloc_bottom = PAGE_ALIGN(prom_initrd_end); + + prom_printf("memory layout at init:\n"); + prom_printf(" memory_limit : %lx (16 MB aligned)\n", + prom_memory_limit); + prom_printf(" alloc_bottom : %lx\n", alloc_bottom); + prom_printf(" alloc_top : %lx\n", alloc_top); + prom_printf(" alloc_top_hi : %lx\n", alloc_top_high); + prom_printf(" rmo_top : %lx\n", rmo_top); + prom_printf(" ram_top : %lx\n", ram_top); +} + +static void __init prom_close_stdin(void) +{ + __be32 val; + ihandle stdin; + + if (prom_getprop(prom.chosen, "stdin", &val, sizeof(val)) > 0) { + stdin = be32_to_cpu(val); + call_prom("close", 1, 0, stdin); + } +} + +#ifdef CONFIG_PPC_SVM +static int __init prom_rtas_hcall(uint64_t args) +{ + register uint64_t arg1 asm("r3") = H_RTAS; + register uint64_t arg2 asm("r4") = args; + + asm volatile("sc 1\n" : "=r" (arg1) : + "r" (arg1), + "r" (arg2) :); + srr_regs_clobbered(); + + return arg1; +} + +static struct rtas_args __prombss os_term_args; + +static void __init prom_rtas_os_term(char *str) +{ + phandle rtas_node; + __be32 val; + u32 token; + + prom_debug("%s: start...\n", __func__); + rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas")); + prom_debug("rtas_node: %x\n", rtas_node); + if (!PHANDLE_VALID(rtas_node)) + return; + + val = 0; + prom_getprop(rtas_node, "ibm,os-term", &val, sizeof(val)); + token = be32_to_cpu(val); + prom_debug("ibm,os-term: %x\n", token); + if (token == 0) + prom_panic("Could not get token for ibm,os-term\n"); + os_term_args.token = cpu_to_be32(token); + os_term_args.nargs = cpu_to_be32(1); + os_term_args.nret = cpu_to_be32(1); + os_term_args.args[0] = cpu_to_be32(__pa(str)); + prom_rtas_hcall((uint64_t)&os_term_args); +} +#endif /* CONFIG_PPC_SVM */ + +/* + * Allocate room for and instantiate RTAS + */ +static void __init prom_instantiate_rtas(void) +{ + phandle rtas_node; + ihandle rtas_inst; + u32 base, entry = 0; + __be32 val; + u32 size = 0; + + prom_debug("prom_instantiate_rtas: start...\n"); + + rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas")); + prom_debug("rtas_node: %x\n", rtas_node); + if (!PHANDLE_VALID(rtas_node)) + return; + + val = 0; + prom_getprop(rtas_node, "rtas-size", &val, sizeof(size)); + size = be32_to_cpu(val); + if (size == 0) + return; + + base = alloc_down(size, PAGE_SIZE, 0); + if (base == 0) + prom_panic("Could not allocate memory for RTAS\n"); + + rtas_inst = call_prom("open", 1, 1, ADDR("/rtas")); + if (!IHANDLE_VALID(rtas_inst)) { + prom_printf("opening rtas package failed (%x)\n", rtas_inst); + return; + } + + prom_printf("instantiating rtas at 0x%x...", base); + + if (call_prom_ret("call-method", 3, 2, &entry, + ADDR("instantiate-rtas"), + rtas_inst, base) != 0 + || entry == 0) { + prom_printf(" failed\n"); + return; + } + prom_printf(" done\n"); + + reserve_mem(base, size); + + val = cpu_to_be32(base); + prom_setprop(rtas_node, "/rtas", "linux,rtas-base", + &val, sizeof(val)); + val = cpu_to_be32(entry); + prom_setprop(rtas_node, "/rtas", "linux,rtas-entry", + &val, sizeof(val)); + + /* Check if it supports "query-cpu-stopped-state" */ + if (prom_getprop(rtas_node, "query-cpu-stopped-state", + &val, sizeof(val)) != PROM_ERROR) + rtas_has_query_cpu_stopped = true; + + prom_debug("rtas base = 0x%x\n", base); + prom_debug("rtas entry = 0x%x\n", entry); + prom_debug("rtas size = 0x%x\n", size); + + prom_debug("prom_instantiate_rtas: end...\n"); +} + +#ifdef CONFIG_PPC64 +/* + * Allocate room for and instantiate Stored Measurement Log (SML) + */ +static void __init prom_instantiate_sml(void) +{ + phandle ibmvtpm_node; + ihandle ibmvtpm_inst; + u32 entry = 0, size = 0, succ = 0; + u64 base; + __be32 val; + + prom_debug("prom_instantiate_sml: start...\n"); + + ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/vdevice/vtpm")); + prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node); + if (!PHANDLE_VALID(ibmvtpm_node)) + return; + + ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/vdevice/vtpm")); + if (!IHANDLE_VALID(ibmvtpm_inst)) { + prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst); + return; + } + + if (prom_getprop(ibmvtpm_node, "ibm,sml-efi-reformat-supported", + &val, sizeof(val)) != PROM_ERROR) { + if (call_prom_ret("call-method", 2, 2, &succ, + ADDR("reformat-sml-to-efi-alignment"), + ibmvtpm_inst) != 0 || succ == 0) { + prom_printf("Reformat SML to EFI alignment failed\n"); + return; + } + + if (call_prom_ret("call-method", 2, 2, &size, + ADDR("sml-get-allocated-size"), + ibmvtpm_inst) != 0 || size == 0) { + prom_printf("SML get allocated size failed\n"); + return; + } + } else { + if (call_prom_ret("call-method", 2, 2, &size, + ADDR("sml-get-handover-size"), + ibmvtpm_inst) != 0 || size == 0) { + prom_printf("SML get handover size failed\n"); + return; + } + } + + base = alloc_down(size, PAGE_SIZE, 0); + if (base == 0) + prom_panic("Could not allocate memory for sml\n"); + + prom_printf("instantiating sml at 0x%llx...", base); + + memset((void *)base, 0, size); + + if (call_prom_ret("call-method", 4, 2, &entry, + ADDR("sml-handover"), + ibmvtpm_inst, size, base) != 0 || entry == 0) { + prom_printf("SML handover failed\n"); + return; + } + prom_printf(" done\n"); + + reserve_mem(base, size); + + prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-base", + &base, sizeof(base)); + prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-size", + &size, sizeof(size)); + + prom_debug("sml base = 0x%llx\n", base); + prom_debug("sml size = 0x%x\n", size); + + prom_debug("prom_instantiate_sml: end...\n"); +} + +/* + * Allocate room for and initialize TCE tables + */ +#ifdef __BIG_ENDIAN__ +static void __init prom_initialize_tce_table(void) +{ + phandle node; + ihandle phb_node; + char compatible[64], type[64], model[64]; + char *path = prom_scratch; + u64 base, align; + u32 minalign, minsize; + u64 tce_entry, *tce_entryp; + u64 local_alloc_top, local_alloc_bottom; + u64 i; + + if (prom_iommu_off) + return; + + prom_debug("starting prom_initialize_tce_table\n"); + + /* Cache current top of allocs so we reserve a single block */ + local_alloc_top = alloc_top_high; + local_alloc_bottom = local_alloc_top; + + /* Search all nodes looking for PHBs. */ + for (node = 0; prom_next_node(&node); ) { + compatible[0] = 0; + type[0] = 0; + model[0] = 0; + prom_getprop(node, "compatible", + compatible, sizeof(compatible)); + prom_getprop(node, "device_type", type, sizeof(type)); + prom_getprop(node, "model", model, sizeof(model)); + + if ((type[0] == 0) || (prom_strstr(type, "pci") == NULL)) + continue; + + /* Keep the old logic intact to avoid regression. */ + if (compatible[0] != 0) { + if ((prom_strstr(compatible, "python") == NULL) && + (prom_strstr(compatible, "Speedwagon") == NULL) && + (prom_strstr(compatible, "Winnipeg") == NULL)) + continue; + } else if (model[0] != 0) { + if ((prom_strstr(model, "ython") == NULL) && + (prom_strstr(model, "peedwagon") == NULL) && + (prom_strstr(model, "innipeg") == NULL)) + continue; + } + + if (prom_getprop(node, "tce-table-minalign", &minalign, + sizeof(minalign)) == PROM_ERROR) + minalign = 0; + if (prom_getprop(node, "tce-table-minsize", &minsize, + sizeof(minsize)) == PROM_ERROR) + minsize = 4UL << 20; + + /* + * Even though we read what OF wants, we just set the table + * size to 4 MB. This is enough to map 2GB of PCI DMA space. + * By doing this, we avoid the pitfalls of trying to DMA to + * MMIO space and the DMA alias hole. + */ + minsize = 4UL << 20; + + /* Align to the greater of the align or size */ + align = max(minalign, minsize); + base = alloc_down(minsize, align, 1); + if (base == 0) + prom_panic("ERROR, cannot find space for TCE table.\n"); + if (base < local_alloc_bottom) + local_alloc_bottom = base; + + /* It seems OF doesn't null-terminate the path :-( */ + memset(path, 0, sizeof(prom_scratch)); + /* Call OF to setup the TCE hardware */ + if (call_prom("package-to-path", 3, 1, node, + path, sizeof(prom_scratch) - 1) == PROM_ERROR) { + prom_printf("package-to-path failed\n"); + } + + /* Save away the TCE table attributes for later use. */ + prom_setprop(node, path, "linux,tce-base", &base, sizeof(base)); + prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize)); + + prom_debug("TCE table: %s\n", path); + prom_debug("\tnode = 0x%x\n", node); + prom_debug("\tbase = 0x%llx\n", base); + prom_debug("\tsize = 0x%x\n", minsize); + + /* Initialize the table to have a one-to-one mapping + * over the allocated size. + */ + tce_entryp = (u64 *)base; + for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) { + tce_entry = (i << PAGE_SHIFT); + tce_entry |= 0x3; + *tce_entryp = tce_entry; + } + + prom_printf("opening PHB %s", path); + phb_node = call_prom("open", 1, 1, path); + if (phb_node == 0) + prom_printf("... failed\n"); + else + prom_printf("... done\n"); + + call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"), + phb_node, -1, minsize, + (u32) base, (u32) (base >> 32)); + call_prom("close", 1, 0, phb_node); + } + + reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom); + + /* These are only really needed if there is a memory limit in + * effect, but we don't know so export them always. */ + prom_tce_alloc_start = local_alloc_bottom; + prom_tce_alloc_end = local_alloc_top; + + /* Flag the first invalid entry */ + prom_debug("ending prom_initialize_tce_table\n"); +} +#endif /* __BIG_ENDIAN__ */ +#endif /* CONFIG_PPC64 */ + +/* + * With CHRP SMP we need to use the OF to start the other processors. + * We can't wait until smp_boot_cpus (the OF is trashed by then) + * so we have to put the processors into a holding pattern controlled + * by the kernel (not OF) before we destroy the OF. + * + * This uses a chunk of low memory, puts some holding pattern + * code there and sends the other processors off to there until + * smp_boot_cpus tells them to do something. The holding pattern + * checks that address until its cpu # is there, when it is that + * cpu jumps to __secondary_start(). smp_boot_cpus() takes care + * of setting those values. + * + * We also use physical address 0x4 here to tell when a cpu + * is in its holding pattern code. + * + * -- Cort + */ +/* + * We want to reference the copy of __secondary_hold_* in the + * 0 - 0x100 address range + */ +#define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff) + +static void __init prom_hold_cpus(void) +{ + unsigned long i; + phandle node; + char type[64]; + unsigned long *spinloop + = (void *) LOW_ADDR(__secondary_hold_spinloop); + unsigned long *acknowledge + = (void *) LOW_ADDR(__secondary_hold_acknowledge); + unsigned long secondary_hold = LOW_ADDR(__secondary_hold); + + /* + * On pseries, if RTAS supports "query-cpu-stopped-state", + * we skip this stage, the CPUs will be started by the + * kernel using RTAS. + */ + if ((of_platform == PLATFORM_PSERIES || + of_platform == PLATFORM_PSERIES_LPAR) && + rtas_has_query_cpu_stopped) { + prom_printf("prom_hold_cpus: skipped\n"); + return; + } + + prom_debug("prom_hold_cpus: start...\n"); + prom_debug(" 1) spinloop = 0x%lx\n", (unsigned long)spinloop); + prom_debug(" 1) *spinloop = 0x%lx\n", *spinloop); + prom_debug(" 1) acknowledge = 0x%lx\n", + (unsigned long)acknowledge); + prom_debug(" 1) *acknowledge = 0x%lx\n", *acknowledge); + prom_debug(" 1) secondary_hold = 0x%lx\n", secondary_hold); + + /* Set the common spinloop variable, so all of the secondary cpus + * will block when they are awakened from their OF spinloop. + * This must occur for both SMP and non SMP kernels, since OF will + * be trashed when we move the kernel. + */ + *spinloop = 0; + + /* look for cpus */ + for (node = 0; prom_next_node(&node); ) { + unsigned int cpu_no; + __be32 reg; + + type[0] = 0; + prom_getprop(node, "device_type", type, sizeof(type)); + if (prom_strcmp(type, "cpu") != 0) + continue; + + /* Skip non-configured cpus. */ + if (prom_getprop(node, "status", type, sizeof(type)) > 0) + if (prom_strcmp(type, "okay") != 0) + continue; + + reg = cpu_to_be32(-1); /* make sparse happy */ + prom_getprop(node, "reg", ®, sizeof(reg)); + cpu_no = be32_to_cpu(reg); + + prom_debug("cpu hw idx = %u\n", cpu_no); + + /* Init the acknowledge var which will be reset by + * the secondary cpu when it awakens from its OF + * spinloop. + */ + *acknowledge = (unsigned long)-1; + + if (cpu_no != prom.cpu) { + /* Primary Thread of non-boot cpu or any thread */ + prom_printf("starting cpu hw idx %u... ", cpu_no); + call_prom("start-cpu", 3, 0, node, + secondary_hold, cpu_no); + + for (i = 0; (i < 100000000) && + (*acknowledge == ((unsigned long)-1)); i++ ) + mb(); + + if (*acknowledge == cpu_no) + prom_printf("done\n"); + else + prom_printf("failed: %lx\n", *acknowledge); + } +#ifdef CONFIG_SMP + else + prom_printf("boot cpu hw idx %u\n", cpu_no); +#endif /* CONFIG_SMP */ + } + + prom_debug("prom_hold_cpus: end...\n"); +} + + +static void __init prom_init_client_services(unsigned long pp) +{ + /* Get a handle to the prom entry point before anything else */ + prom_entry = pp; + + /* get a handle for the stdout device */ + prom.chosen = call_prom("finddevice", 1, 1, ADDR("/chosen")); + if (!PHANDLE_VALID(prom.chosen)) + prom_panic("cannot find chosen"); /* msg won't be printed :( */ + + /* get device tree root */ + prom.root = call_prom("finddevice", 1, 1, ADDR("/")); + if (!PHANDLE_VALID(prom.root)) + prom_panic("cannot find device tree root"); /* msg won't be printed :( */ + + prom.mmumap = 0; +} + +#ifdef CONFIG_PPC32 +/* + * For really old powermacs, we need to map things we claim. + * For that, we need the ihandle of the mmu. + * Also, on the longtrail, we need to work around other bugs. + */ +static void __init prom_find_mmu(void) +{ + phandle oprom; + char version[64]; + + oprom = call_prom("finddevice", 1, 1, ADDR("/openprom")); + if (!PHANDLE_VALID(oprom)) + return; + if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0) + return; + version[sizeof(version) - 1] = 0; + /* XXX might need to add other versions here */ + if (prom_strcmp(version, "Open Firmware, 1.0.5") == 0) + of_workarounds = OF_WA_CLAIM; + else if (prom_strncmp(version, "FirmWorks,3.", 12) == 0) { + of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL; + call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim"); + } else + return; + prom.memory = call_prom("open", 1, 1, ADDR("/memory")); + prom_getprop(prom.chosen, "mmu", &prom.mmumap, + sizeof(prom.mmumap)); + prom.mmumap = be32_to_cpu(prom.mmumap); + if (!IHANDLE_VALID(prom.memory) || !IHANDLE_VALID(prom.mmumap)) + of_workarounds &= ~OF_WA_CLAIM; /* hmmm */ +} +#else +#define prom_find_mmu() +#endif + +static void __init prom_init_stdout(void) +{ + char *path = of_stdout_device; + char type[16]; + phandle stdout_node; + __be32 val; + + if (prom_getprop(prom.chosen, "stdout", &val, sizeof(val)) <= 0) + prom_panic("cannot find stdout"); + + prom.stdout = be32_to_cpu(val); + + /* Get the full OF pathname of the stdout device */ + memset(path, 0, 256); + call_prom("instance-to-path", 3, 1, prom.stdout, path, 255); + prom_printf("OF stdout device is: %s\n", of_stdout_device); + prom_setprop(prom.chosen, "/chosen", "linux,stdout-path", + path, prom_strlen(path) + 1); + + /* instance-to-package fails on PA-Semi */ + stdout_node = call_prom("instance-to-package", 1, 1, prom.stdout); + if (stdout_node != PROM_ERROR) { + val = cpu_to_be32(stdout_node); + + /* If it's a display, note it */ + memset(type, 0, sizeof(type)); + prom_getprop(stdout_node, "device_type", type, sizeof(type)); + if (prom_strcmp(type, "display") == 0) + prom_setprop(stdout_node, path, "linux,boot-display", NULL, 0); + } +} + +static int __init prom_find_machine_type(void) +{ + static char compat[256] __prombss; + int len, i = 0; +#ifdef CONFIG_PPC64 + phandle rtas; + int x; +#endif + + /* Look for a PowerMac or a Cell */ + len = prom_getprop(prom.root, "compatible", + compat, sizeof(compat)-1); + if (len > 0) { + compat[len] = 0; + while (i < len) { + char *p = &compat[i]; + int sl = prom_strlen(p); + if (sl == 0) + break; + if (prom_strstr(p, "Power Macintosh") || + prom_strstr(p, "MacRISC")) + return PLATFORM_POWERMAC; +#ifdef CONFIG_PPC64 + /* We must make sure we don't detect the IBM Cell + * blades as pSeries due to some firmware issues, + * so we do it here. + */ + if (prom_strstr(p, "IBM,CBEA") || + prom_strstr(p, "IBM,CPBW-1.0")) + return PLATFORM_GENERIC; +#endif /* CONFIG_PPC64 */ + i += sl + 1; + } + } +#ifdef CONFIG_PPC64 + /* Try to figure out if it's an IBM pSeries or any other + * PAPR compliant platform. We assume it is if : + * - /device_type is "chrp" (please, do NOT use that for future + * non-IBM designs ! + * - it has /rtas + */ + len = prom_getprop(prom.root, "device_type", + compat, sizeof(compat)-1); + if (len <= 0) + return PLATFORM_GENERIC; + if (prom_strcmp(compat, "chrp")) + return PLATFORM_GENERIC; + + /* Default to pSeries. We need to know if we are running LPAR */ + rtas = call_prom("finddevice", 1, 1, ADDR("/rtas")); + if (!PHANDLE_VALID(rtas)) + return PLATFORM_GENERIC; + x = prom_getproplen(rtas, "ibm,hypertas-functions"); + if (x != PROM_ERROR) { + prom_debug("Hypertas detected, assuming LPAR !\n"); + return PLATFORM_PSERIES_LPAR; + } + return PLATFORM_PSERIES; +#else + return PLATFORM_GENERIC; +#endif +} + +static int __init prom_set_color(ihandle ih, int i, int r, int g, int b) +{ + return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r); +} + +/* + * If we have a display that we don't know how to drive, + * we will want to try to execute OF's open method for it + * later. However, OF will probably fall over if we do that + * we've taken over the MMU. + * So we check whether we will need to open the display, + * and if so, open it now. + */ +static void __init prom_check_displays(void) +{ + char type[16], *path; + phandle node; + ihandle ih; + int i; + + static const unsigned char default_colors[] __initconst = { + 0x00, 0x00, 0x00, + 0x00, 0x00, 0xaa, + 0x00, 0xaa, 0x00, + 0x00, 0xaa, 0xaa, + 0xaa, 0x00, 0x00, + 0xaa, 0x00, 0xaa, + 0xaa, 0xaa, 0x00, + 0xaa, 0xaa, 0xaa, + 0x55, 0x55, 0x55, + 0x55, 0x55, 0xff, + 0x55, 0xff, 0x55, + 0x55, 0xff, 0xff, + 0xff, 0x55, 0x55, + 0xff, 0x55, 0xff, + 0xff, 0xff, 0x55, + 0xff, 0xff, 0xff + }; + const unsigned char *clut; + + prom_debug("Looking for displays\n"); + for (node = 0; prom_next_node(&node); ) { + memset(type, 0, sizeof(type)); + prom_getprop(node, "device_type", type, sizeof(type)); + if (prom_strcmp(type, "display") != 0) + continue; + + /* It seems OF doesn't null-terminate the path :-( */ + path = prom_scratch; + memset(path, 0, sizeof(prom_scratch)); + + /* + * leave some room at the end of the path for appending extra + * arguments + */ + if (call_prom("package-to-path", 3, 1, node, path, + sizeof(prom_scratch) - 10) == PROM_ERROR) + continue; + prom_printf("found display : %s, opening... ", path); + + ih = call_prom("open", 1, 1, path); + if (ih == 0) { + prom_printf("failed\n"); + continue; + } + + /* Success */ + prom_printf("done\n"); + prom_setprop(node, path, "linux,opened", NULL, 0); + + /* Setup a usable color table when the appropriate + * method is available. Should update this to set-colors */ + clut = default_colors; + for (i = 0; i < 16; i++, clut += 3) + if (prom_set_color(ih, i, clut[0], clut[1], + clut[2]) != 0) + break; + +#ifdef CONFIG_LOGO_LINUX_CLUT224 + clut = PTRRELOC(logo_linux_clut224.clut); + for (i = 0; i < logo_linux_clut224.clutsize; i++, clut += 3) + if (prom_set_color(ih, i + 32, clut[0], clut[1], + clut[2]) != 0) + break; +#endif /* CONFIG_LOGO_LINUX_CLUT224 */ + +#ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX + if (prom_getprop(node, "linux,boot-display", NULL, 0) != + PROM_ERROR) { + u32 width, height, pitch, addr; + + prom_printf("Setting btext !\n"); + + if (prom_getprop(node, "width", &width, 4) == PROM_ERROR) + return; + + if (prom_getprop(node, "height", &height, 4) == PROM_ERROR) + return; + + if (prom_getprop(node, "linebytes", &pitch, 4) == PROM_ERROR) + return; + + if (prom_getprop(node, "address", &addr, 4) == PROM_ERROR) + return; + + prom_printf("W=%d H=%d LB=%d addr=0x%x\n", + width, height, pitch, addr); + btext_setup_display(width, height, 8, pitch, addr); + btext_prepare_BAT(); + } +#endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */ + } +} + + +/* Return (relocated) pointer to this much memory: moves initrd if reqd. */ +static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end, + unsigned long needed, unsigned long align) +{ + void *ret; + + *mem_start = ALIGN(*mem_start, align); + while ((*mem_start + needed) > *mem_end) { + unsigned long room, chunk; + + prom_debug("Chunk exhausted, claiming more at %lx...\n", + alloc_bottom); + room = alloc_top - alloc_bottom; + if (room > DEVTREE_CHUNK_SIZE) + room = DEVTREE_CHUNK_SIZE; + if (room < PAGE_SIZE) + prom_panic("No memory for flatten_device_tree " + "(no room)\n"); + chunk = alloc_up(room, 0); + if (chunk == 0) + prom_panic("No memory for flatten_device_tree " + "(claim failed)\n"); + *mem_end = chunk + room; + } + + ret = (void *)*mem_start; + *mem_start += needed; + + return ret; +} + +#define dt_push_token(token, mem_start, mem_end) do { \ + void *room = make_room(mem_start, mem_end, 4, 4); \ + *(__be32 *)room = cpu_to_be32(token); \ + } while(0) + +static unsigned long __init dt_find_string(char *str) +{ + char *s, *os; + + s = os = (char *)dt_string_start; + s += 4; + while (s < (char *)dt_string_end) { + if (prom_strcmp(s, str) == 0) + return s - os; + s += prom_strlen(s) + 1; + } + return 0; +} + +/* + * The Open Firmware 1275 specification states properties must be 31 bytes or + * less, however not all firmwares obey this. Make it 64 bytes to be safe. + */ +#define MAX_PROPERTY_NAME 64 + +static void __init scan_dt_build_strings(phandle node, + unsigned long *mem_start, + unsigned long *mem_end) +{ + char *prev_name, *namep, *sstart; + unsigned long soff; + phandle child; + + sstart = (char *)dt_string_start; + + /* get and store all property names */ + prev_name = ""; + for (;;) { + /* 64 is max len of name including nul. */ + namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1); + if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) { + /* No more nodes: unwind alloc */ + *mem_start = (unsigned long)namep; + break; + } + + /* skip "name" */ + if (prom_strcmp(namep, "name") == 0) { + *mem_start = (unsigned long)namep; + prev_name = "name"; + continue; + } + /* get/create string entry */ + soff = dt_find_string(namep); + if (soff != 0) { + *mem_start = (unsigned long)namep; + namep = sstart + soff; + } else { + /* Trim off some if we can */ + *mem_start = (unsigned long)namep + prom_strlen(namep) + 1; + dt_string_end = *mem_start; + } + prev_name = namep; + } + + /* do all our children */ + child = call_prom("child", 1, 1, node); + while (child != 0) { + scan_dt_build_strings(child, mem_start, mem_end); + child = call_prom("peer", 1, 1, child); + } +} + +static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start, + unsigned long *mem_end) +{ + phandle child; + char *namep, *prev_name, *sstart, *p, *ep, *lp, *path; + unsigned long soff; + unsigned char *valp; + static char pname[MAX_PROPERTY_NAME] __prombss; + int l, room, has_phandle = 0; + + dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end); + + /* get the node's full name */ + namep = (char *)*mem_start; + room = *mem_end - *mem_start; + if (room > 255) + room = 255; + l = call_prom("package-to-path", 3, 1, node, namep, room); + if (l >= 0) { + /* Didn't fit? Get more room. */ + if (l >= room) { + if (l >= *mem_end - *mem_start) + namep = make_room(mem_start, mem_end, l+1, 1); + call_prom("package-to-path", 3, 1, node, namep, l); + } + namep[l] = '\0'; + + /* Fixup an Apple bug where they have bogus \0 chars in the + * middle of the path in some properties, and extract + * the unit name (everything after the last '/'). + */ + for (lp = p = namep, ep = namep + l; p < ep; p++) { + if (*p == '/') + lp = namep; + else if (*p != 0) + *lp++ = *p; + } + *lp = 0; + *mem_start = ALIGN((unsigned long)lp + 1, 4); + } + + /* get it again for debugging */ + path = prom_scratch; + memset(path, 0, sizeof(prom_scratch)); + call_prom("package-to-path", 3, 1, node, path, sizeof(prom_scratch) - 1); + + /* get and store all properties */ + prev_name = ""; + sstart = (char *)dt_string_start; + for (;;) { + if (call_prom("nextprop", 3, 1, node, prev_name, + pname) != 1) + break; + + /* skip "name" */ + if (prom_strcmp(pname, "name") == 0) { + prev_name = "name"; + continue; + } + + /* find string offset */ + soff = dt_find_string(pname); + if (soff == 0) { + prom_printf("WARNING: Can't find string index for" + " <%s>, node %s\n", pname, path); + break; + } + prev_name = sstart + soff; + + /* get length */ + l = call_prom("getproplen", 2, 1, node, pname); + + /* sanity checks */ + if (l == PROM_ERROR) + continue; + + /* push property head */ + dt_push_token(OF_DT_PROP, mem_start, mem_end); + dt_push_token(l, mem_start, mem_end); + dt_push_token(soff, mem_start, mem_end); + + /* push property content */ + valp = make_room(mem_start, mem_end, l, 4); + call_prom("getprop", 4, 1, node, pname, valp, l); + *mem_start = ALIGN(*mem_start, 4); + + if (!prom_strcmp(pname, "phandle")) + has_phandle = 1; + } + + /* Add a "phandle" property if none already exist */ + if (!has_phandle) { + soff = dt_find_string("phandle"); + if (soff == 0) + prom_printf("WARNING: Can't find string index for <phandle> node %s\n", path); + else { + dt_push_token(OF_DT_PROP, mem_start, mem_end); + dt_push_token(4, mem_start, mem_end); + dt_push_token(soff, mem_start, mem_end); + valp = make_room(mem_start, mem_end, 4, 4); + *(__be32 *)valp = cpu_to_be32(node); + } + } + + /* do all our children */ + child = call_prom("child", 1, 1, node); + while (child != 0) { + scan_dt_build_struct(child, mem_start, mem_end); + child = call_prom("peer", 1, 1, child); + } + + dt_push_token(OF_DT_END_NODE, mem_start, mem_end); +} + +static void __init flatten_device_tree(void) +{ + phandle root; + unsigned long mem_start, mem_end, room; + struct boot_param_header *hdr; + char *namep; + u64 *rsvmap; + + /* + * Check how much room we have between alloc top & bottom (+/- a + * few pages), crop to 1MB, as this is our "chunk" size + */ + room = alloc_top - alloc_bottom - 0x4000; + if (room > DEVTREE_CHUNK_SIZE) + room = DEVTREE_CHUNK_SIZE; + prom_debug("starting device tree allocs at %lx\n", alloc_bottom); + + /* Now try to claim that */ + mem_start = (unsigned long)alloc_up(room, PAGE_SIZE); + if (mem_start == 0) + prom_panic("Can't allocate initial device-tree chunk\n"); + mem_end = mem_start + room; + + /* Get root of tree */ + root = call_prom("peer", 1, 1, (phandle)0); + if (root == (phandle)0) + prom_panic ("couldn't get device tree root\n"); + + /* Build header and make room for mem rsv map */ + mem_start = ALIGN(mem_start, 4); + hdr = make_room(&mem_start, &mem_end, + sizeof(struct boot_param_header), 4); + dt_header_start = (unsigned long)hdr; + rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8); + + /* Start of strings */ + mem_start = PAGE_ALIGN(mem_start); + dt_string_start = mem_start; + mem_start += 4; /* hole */ + + /* Add "phandle" in there, we'll need it */ + namep = make_room(&mem_start, &mem_end, 16, 1); + prom_strscpy_pad(namep, "phandle", sizeof("phandle")); + mem_start = (unsigned long)namep + prom_strlen(namep) + 1; + + /* Build string array */ + prom_printf("Building dt strings...\n"); + scan_dt_build_strings(root, &mem_start, &mem_end); + dt_string_end = mem_start; + + /* Build structure */ + mem_start = PAGE_ALIGN(mem_start); + dt_struct_start = mem_start; + prom_printf("Building dt structure...\n"); + scan_dt_build_struct(root, &mem_start, &mem_end); + dt_push_token(OF_DT_END, &mem_start, &mem_end); + dt_struct_end = PAGE_ALIGN(mem_start); + + /* Finish header */ + hdr->boot_cpuid_phys = cpu_to_be32(prom.cpu); + hdr->magic = cpu_to_be32(OF_DT_HEADER); + hdr->totalsize = cpu_to_be32(dt_struct_end - dt_header_start); + hdr->off_dt_struct = cpu_to_be32(dt_struct_start - dt_header_start); + hdr->off_dt_strings = cpu_to_be32(dt_string_start - dt_header_start); + hdr->dt_strings_size = cpu_to_be32(dt_string_end - dt_string_start); + hdr->off_mem_rsvmap = cpu_to_be32(((unsigned long)rsvmap) - dt_header_start); + hdr->version = cpu_to_be32(OF_DT_VERSION); + /* Version 16 is not backward compatible */ + hdr->last_comp_version = cpu_to_be32(0x10); + + /* Copy the reserve map in */ + memcpy(rsvmap, mem_reserve_map, sizeof(mem_reserve_map)); + +#ifdef DEBUG_PROM + { + int i; + prom_printf("reserved memory map:\n"); + for (i = 0; i < mem_reserve_cnt; i++) + prom_printf(" %llx - %llx\n", + be64_to_cpu(mem_reserve_map[i].base), + be64_to_cpu(mem_reserve_map[i].size)); + } +#endif + /* Bump mem_reserve_cnt to cause further reservations to fail + * since it's too late. + */ + mem_reserve_cnt = MEM_RESERVE_MAP_SIZE; + + prom_printf("Device tree strings 0x%lx -> 0x%lx\n", + dt_string_start, dt_string_end); + prom_printf("Device tree struct 0x%lx -> 0x%lx\n", + dt_struct_start, dt_struct_end); +} + +#ifdef CONFIG_PPC_MAPLE +/* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property. + * The values are bad, and it doesn't even have the right number of cells. */ +static void __init fixup_device_tree_maple(void) +{ + phandle isa; + u32 rloc = 0x01002000; /* IO space; PCI device = 4 */ + u32 isa_ranges[6]; + char *name; + + name = "/ht@0/isa@4"; + isa = call_prom("finddevice", 1, 1, ADDR(name)); + if (!PHANDLE_VALID(isa)) { + name = "/ht@0/isa@6"; + isa = call_prom("finddevice", 1, 1, ADDR(name)); + rloc = 0x01003000; /* IO space; PCI device = 6 */ + } + if (!PHANDLE_VALID(isa)) + return; + + if (prom_getproplen(isa, "ranges") != 12) + return; + if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges)) + == PROM_ERROR) + return; + + if (isa_ranges[0] != 0x1 || + isa_ranges[1] != 0xf4000000 || + isa_ranges[2] != 0x00010000) + return; + + prom_printf("Fixing up bogus ISA range on Maple/Apache...\n"); + + isa_ranges[0] = 0x1; + isa_ranges[1] = 0x0; + isa_ranges[2] = rloc; + isa_ranges[3] = 0x0; + isa_ranges[4] = 0x0; + isa_ranges[5] = 0x00010000; + prom_setprop(isa, name, "ranges", + isa_ranges, sizeof(isa_ranges)); +} + +#define CPC925_MC_START 0xf8000000 +#define CPC925_MC_LENGTH 0x1000000 +/* The values for memory-controller don't have right number of cells */ +static void __init fixup_device_tree_maple_memory_controller(void) +{ + phandle mc; + u32 mc_reg[4]; + char *name = "/hostbridge@f8000000"; + u32 ac, sc; + + mc = call_prom("finddevice", 1, 1, ADDR(name)); + if (!PHANDLE_VALID(mc)) + return; + + if (prom_getproplen(mc, "reg") != 8) + return; + + prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac)); + prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc)); + if ((ac != 2) || (sc != 2)) + return; + + if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR) + return; + + if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH) + return; + + prom_printf("Fixing up bogus hostbridge on Maple...\n"); + + mc_reg[0] = 0x0; + mc_reg[1] = CPC925_MC_START; + mc_reg[2] = 0x0; + mc_reg[3] = CPC925_MC_LENGTH; + prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg)); +} +#else +#define fixup_device_tree_maple() +#define fixup_device_tree_maple_memory_controller() +#endif + +#ifdef CONFIG_PPC_CHRP +/* + * Pegasos and BriQ lacks the "ranges" property in the isa node + * Pegasos needs decimal IRQ 14/15, not hexadecimal + * Pegasos has the IDE configured in legacy mode, but advertised as native + */ +static void __init fixup_device_tree_chrp(void) +{ + phandle ph; + u32 prop[6]; + u32 rloc = 0x01006000; /* IO space; PCI device = 12 */ + char *name; + int rc; + + name = "/pci@80000000/isa@c"; + ph = call_prom("finddevice", 1, 1, ADDR(name)); + if (!PHANDLE_VALID(ph)) { + name = "/pci@ff500000/isa@6"; + ph = call_prom("finddevice", 1, 1, ADDR(name)); + rloc = 0x01003000; /* IO space; PCI device = 6 */ + } + if (PHANDLE_VALID(ph)) { + rc = prom_getproplen(ph, "ranges"); + if (rc == 0 || rc == PROM_ERROR) { + prom_printf("Fixing up missing ISA range on Pegasos...\n"); + + prop[0] = 0x1; + prop[1] = 0x0; + prop[2] = rloc; + prop[3] = 0x0; + prop[4] = 0x0; + prop[5] = 0x00010000; + prom_setprop(ph, name, "ranges", prop, sizeof(prop)); + } + } + + name = "/pci@80000000/ide@C,1"; + ph = call_prom("finddevice", 1, 1, ADDR(name)); + if (PHANDLE_VALID(ph)) { + prom_printf("Fixing up IDE interrupt on Pegasos...\n"); + prop[0] = 14; + prop[1] = 0x0; + prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32)); + prom_printf("Fixing up IDE class-code on Pegasos...\n"); + rc = prom_getprop(ph, "class-code", prop, sizeof(u32)); + if (rc == sizeof(u32)) { + prop[0] &= ~0x5; + prom_setprop(ph, name, "class-code", prop, sizeof(u32)); + } + } +} +#else +#define fixup_device_tree_chrp() +#endif + +#if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC) +static void __init fixup_device_tree_pmac(void) +{ + phandle u3, i2c, mpic; + u32 u3_rev; + u32 interrupts[2]; + u32 parent; + + /* Some G5s have a missing interrupt definition, fix it up here */ + u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000")); + if (!PHANDLE_VALID(u3)) + return; + i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000")); + if (!PHANDLE_VALID(i2c)) + return; + mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000")); + if (!PHANDLE_VALID(mpic)) + return; + + /* check if proper rev of u3 */ + if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev)) + == PROM_ERROR) + return; + if (u3_rev < 0x35 || u3_rev > 0x39) + return; + /* does it need fixup ? */ + if (prom_getproplen(i2c, "interrupts") > 0) + return; + + prom_printf("fixing up bogus interrupts for u3 i2c...\n"); + + /* interrupt on this revision of u3 is number 0 and level */ + interrupts[0] = 0; + interrupts[1] = 1; + prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts", + &interrupts, sizeof(interrupts)); + parent = (u32)mpic; + prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent", + &parent, sizeof(parent)); +} +#else +#define fixup_device_tree_pmac() +#endif + +#ifdef CONFIG_PPC_EFIKA +/* + * The MPC5200 FEC driver requires an phy-handle property to tell it how + * to talk to the phy. If the phy-handle property is missing, then this + * function is called to add the appropriate nodes and link it to the + * ethernet node. + */ +static void __init fixup_device_tree_efika_add_phy(void) +{ + u32 node; + char prop[64]; + int rv; + + /* Check if /builtin/ethernet exists - bail if it doesn't */ + node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet")); + if (!PHANDLE_VALID(node)) + return; + + /* Check if the phy-handle property exists - bail if it does */ + rv = prom_getprop(node, "phy-handle", prop, sizeof(prop)); + if (rv <= 0) + return; + + /* + * At this point the ethernet device doesn't have a phy described. + * Now we need to add the missing phy node and linkage + */ + + /* Check for an MDIO bus node - if missing then create one */ + node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio")); + if (!PHANDLE_VALID(node)) { + prom_printf("Adding Ethernet MDIO node\n"); + call_prom("interpret", 1, 1, + " s\" /builtin\" find-device" + " new-device" + " 1 encode-int s\" #address-cells\" property" + " 0 encode-int s\" #size-cells\" property" + " s\" mdio\" device-name" + " s\" fsl,mpc5200b-mdio\" encode-string" + " s\" compatible\" property" + " 0xf0003000 0x400 reg" + " 0x2 encode-int" + " 0x5 encode-int encode+" + " 0x3 encode-int encode+" + " s\" interrupts\" property" + " finish-device"); + } + + /* Check for a PHY device node - if missing then create one and + * give it's phandle to the ethernet node */ + node = call_prom("finddevice", 1, 1, + ADDR("/builtin/mdio/ethernet-phy")); + if (!PHANDLE_VALID(node)) { + prom_printf("Adding Ethernet PHY node\n"); + call_prom("interpret", 1, 1, + " s\" /builtin/mdio\" find-device" + " new-device" + " s\" ethernet-phy\" device-name" + " 0x10 encode-int s\" reg\" property" + " my-self" + " ihandle>phandle" + " finish-device" + " s\" /builtin/ethernet\" find-device" + " encode-int" + " s\" phy-handle\" property" + " device-end"); + } +} + +static void __init fixup_device_tree_efika(void) +{ + int sound_irq[3] = { 2, 2, 0 }; + int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0, + 3,4,0, 3,5,0, 3,6,0, 3,7,0, + 3,8,0, 3,9,0, 3,10,0, 3,11,0, + 3,12,0, 3,13,0, 3,14,0, 3,15,0 }; + u32 node; + char prop[64]; + int rv, len; + + /* Check if we're really running on a EFIKA */ + node = call_prom("finddevice", 1, 1, ADDR("/")); + if (!PHANDLE_VALID(node)) + return; + + rv = prom_getprop(node, "model", prop, sizeof(prop)); + if (rv == PROM_ERROR) + return; + if (prom_strcmp(prop, "EFIKA5K2")) + return; + + prom_printf("Applying EFIKA device tree fixups\n"); + + /* Claiming to be 'chrp' is death */ + node = call_prom("finddevice", 1, 1, ADDR("/")); + rv = prom_getprop(node, "device_type", prop, sizeof(prop)); + if (rv != PROM_ERROR && (prom_strcmp(prop, "chrp") == 0)) + prom_setprop(node, "/", "device_type", "efika", sizeof("efika")); + + /* CODEGEN,description is exposed in /proc/cpuinfo so + fix that too */ + rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop)); + if (rv != PROM_ERROR && (prom_strstr(prop, "CHRP"))) + prom_setprop(node, "/", "CODEGEN,description", + "Efika 5200B PowerPC System", + sizeof("Efika 5200B PowerPC System")); + + /* Fixup bestcomm interrupts property */ + node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm")); + if (PHANDLE_VALID(node)) { + len = prom_getproplen(node, "interrupts"); + if (len == 12) { + prom_printf("Fixing bestcomm interrupts property\n"); + prom_setprop(node, "/builtin/bestcom", "interrupts", + bcomm_irq, sizeof(bcomm_irq)); + } + } + + /* Fixup sound interrupts property */ + node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound")); + if (PHANDLE_VALID(node)) { + rv = prom_getprop(node, "interrupts", prop, sizeof(prop)); + if (rv == PROM_ERROR) { + prom_printf("Adding sound interrupts property\n"); + prom_setprop(node, "/builtin/sound", "interrupts", + sound_irq, sizeof(sound_irq)); + } + } + + /* Make sure ethernet phy-handle property exists */ + fixup_device_tree_efika_add_phy(); +} +#else +#define fixup_device_tree_efika() +#endif + +#ifdef CONFIG_PPC_PASEMI_NEMO +/* + * CFE supplied on Nemo is broken in several ways, biggest + * problem is that it reassigns ISA interrupts to unused mpic ints. + * Add an interrupt-controller property for the io-bridge to use + * and correct the ints so we can attach them to an irq_domain + */ +static void __init fixup_device_tree_pasemi(void) +{ + u32 interrupts[2], parent, rval, val = 0; + char *name, *pci_name; + phandle iob, node; + + /* Find the root pci node */ + name = "/pxp@0,e0000000"; + iob = call_prom("finddevice", 1, 1, ADDR(name)); + if (!PHANDLE_VALID(iob)) + return; + + /* check if interrupt-controller node set yet */ + if (prom_getproplen(iob, "interrupt-controller") !=PROM_ERROR) + return; + + prom_printf("adding interrupt-controller property for SB600...\n"); + + prom_setprop(iob, name, "interrupt-controller", &val, 0); + + pci_name = "/pxp@0,e0000000/pci@11"; + node = call_prom("finddevice", 1, 1, ADDR(pci_name)); + parent = ADDR(iob); + + for( ; prom_next_node(&node); ) { + /* scan each node for one with an interrupt */ + if (!PHANDLE_VALID(node)) + continue; + + rval = prom_getproplen(node, "interrupts"); + if (rval == 0 || rval == PROM_ERROR) + continue; + + prom_getprop(node, "interrupts", &interrupts, sizeof(interrupts)); + if ((interrupts[0] < 212) || (interrupts[0] > 222)) + continue; + + /* found a node, update both interrupts and interrupt-parent */ + if ((interrupts[0] >= 212) && (interrupts[0] <= 215)) + interrupts[0] -= 203; + if ((interrupts[0] >= 216) && (interrupts[0] <= 220)) + interrupts[0] -= 213; + if (interrupts[0] == 221) + interrupts[0] = 14; + if (interrupts[0] == 222) + interrupts[0] = 8; + + prom_setprop(node, pci_name, "interrupts", interrupts, + sizeof(interrupts)); + prom_setprop(node, pci_name, "interrupt-parent", &parent, + sizeof(parent)); + } + + /* + * The io-bridge has device_type set to 'io-bridge' change it to 'isa' + * so that generic isa-bridge code can add the SB600 and its on-board + * peripherals. + */ + name = "/pxp@0,e0000000/io-bridge@0"; + iob = call_prom("finddevice", 1, 1, ADDR(name)); + if (!PHANDLE_VALID(iob)) + return; + + /* device_type is already set, just change it. */ + + prom_printf("Changing device_type of SB600 node...\n"); + + prom_setprop(iob, name, "device_type", "isa", sizeof("isa")); +} +#else /* !CONFIG_PPC_PASEMI_NEMO */ +static inline void fixup_device_tree_pasemi(void) { } +#endif + +static void __init fixup_device_tree(void) +{ + fixup_device_tree_maple(); + fixup_device_tree_maple_memory_controller(); + fixup_device_tree_chrp(); + fixup_device_tree_pmac(); + fixup_device_tree_efika(); + fixup_device_tree_pasemi(); +} + +static void __init prom_find_boot_cpu(void) +{ + __be32 rval; + ihandle prom_cpu; + phandle cpu_pkg; + + rval = 0; + if (prom_getprop(prom.chosen, "cpu", &rval, sizeof(rval)) <= 0) + return; + prom_cpu = be32_to_cpu(rval); + + cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu); + + if (!PHANDLE_VALID(cpu_pkg)) + return; + + prom_getprop(cpu_pkg, "reg", &rval, sizeof(rval)); + prom.cpu = be32_to_cpu(rval); + + prom_debug("Booting CPU hw index = %d\n", prom.cpu); +} + +static void __init prom_check_initrd(unsigned long r3, unsigned long r4) +{ +#ifdef CONFIG_BLK_DEV_INITRD + if (r3 && r4 && r4 != 0xdeadbeef) { + __be64 val; + + prom_initrd_start = is_kernel_addr(r3) ? __pa(r3) : r3; + prom_initrd_end = prom_initrd_start + r4; + + val = cpu_to_be64(prom_initrd_start); + prom_setprop(prom.chosen, "/chosen", "linux,initrd-start", + &val, sizeof(val)); + val = cpu_to_be64(prom_initrd_end); + prom_setprop(prom.chosen, "/chosen", "linux,initrd-end", + &val, sizeof(val)); + + reserve_mem(prom_initrd_start, + prom_initrd_end - prom_initrd_start); + + prom_debug("initrd_start=0x%lx\n", prom_initrd_start); + prom_debug("initrd_end=0x%lx\n", prom_initrd_end); + } +#endif /* CONFIG_BLK_DEV_INITRD */ +} + +#ifdef CONFIG_PPC_SVM +/* + * Perform the Enter Secure Mode ultracall. + */ +static int __init enter_secure_mode(unsigned long kbase, unsigned long fdt) +{ + register unsigned long r3 asm("r3") = UV_ESM; + register unsigned long r4 asm("r4") = kbase; + register unsigned long r5 asm("r5") = fdt; + + asm volatile("sc 2" : "+r"(r3) : "r"(r4), "r"(r5)); + + return r3; +} + +/* + * Call the Ultravisor to transfer us to secure memory if we have an ESM blob. + */ +static void __init setup_secure_guest(unsigned long kbase, unsigned long fdt) +{ + int ret; + + if (!prom_svm_enable) + return; + + /* Switch to secure mode. */ + prom_printf("Switching to secure mode.\n"); + + /* + * The ultravisor will do an integrity check of the kernel image but we + * relocated it so the check will fail. Restore the original image by + * relocating it back to the kernel virtual base address. + */ + relocate(KERNELBASE); + + ret = enter_secure_mode(kbase, fdt); + + /* Relocate the kernel again. */ + relocate(kbase); + + if (ret != U_SUCCESS) { + prom_printf("Returned %d from switching to secure mode.\n", ret); + prom_rtas_os_term("Switch to secure mode failed.\n"); + } +} +#else +static void __init setup_secure_guest(unsigned long kbase, unsigned long fdt) +{ +} +#endif /* CONFIG_PPC_SVM */ + +/* + * We enter here early on, when the Open Firmware prom is still + * handling exceptions and the MMU hash table for us. + */ + +unsigned long __init prom_init(unsigned long r3, unsigned long r4, + unsigned long pp, + unsigned long r6, unsigned long r7, + unsigned long kbase) +{ + unsigned long hdr; + +#ifdef CONFIG_PPC32 + unsigned long offset = reloc_offset(); + reloc_got2(offset); +#endif + + /* + * First zero the BSS + */ + memset(&__bss_start, 0, __bss_stop - __bss_start); + + /* + * Init interface to Open Firmware, get some node references, + * like /chosen + */ + prom_init_client_services(pp); + + /* + * See if this OF is old enough that we need to do explicit maps + * and other workarounds + */ + prom_find_mmu(); + + /* + * Init prom stdout device + */ + prom_init_stdout(); + + prom_printf("Preparing to boot %s", linux_banner); + + /* + * Get default machine type. At this point, we do not differentiate + * between pSeries SMP and pSeries LPAR + */ + of_platform = prom_find_machine_type(); + prom_printf("Detected machine type: %x\n", of_platform); + +#ifndef CONFIG_NONSTATIC_KERNEL + /* Bail if this is a kdump kernel. */ + if (PHYSICAL_START > 0) + prom_panic("Error: You can't boot a kdump kernel from OF!\n"); +#endif + + /* + * Check for an initrd + */ + prom_check_initrd(r3, r4); + + /* + * Do early parsing of command line + */ + early_cmdline_parse(); + +#ifdef CONFIG_PPC_PSERIES + /* + * On pSeries, inform the firmware about our capabilities + */ + if (of_platform == PLATFORM_PSERIES || + of_platform == PLATFORM_PSERIES_LPAR) + prom_send_capabilities(); +#endif + + /* + * Copy the CPU hold code + */ + if (of_platform != PLATFORM_POWERMAC) + copy_and_flush(0, kbase, 0x100, 0); + + /* + * Initialize memory management within prom_init + */ + prom_init_mem(); + + /* + * Determine which cpu is actually running right _now_ + */ + prom_find_boot_cpu(); + + /* + * Initialize display devices + */ + prom_check_displays(); + +#if defined(CONFIG_PPC64) && defined(__BIG_ENDIAN__) + /* + * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else + * that uses the allocator, we need to make sure we get the top of memory + * available for us here... + */ + if (of_platform == PLATFORM_PSERIES) + prom_initialize_tce_table(); +#endif + + /* + * On non-powermacs, try to instantiate RTAS. PowerMacs don't + * have a usable RTAS implementation. + */ + if (of_platform != PLATFORM_POWERMAC) + prom_instantiate_rtas(); + +#ifdef CONFIG_PPC64 + /* instantiate sml */ + prom_instantiate_sml(); +#endif + + /* + * On non-powermacs, put all CPUs in spin-loops. + * + * PowerMacs use a different mechanism to spin CPUs + * + * (This must be done after instantiating RTAS) + */ + if (of_platform != PLATFORM_POWERMAC) + prom_hold_cpus(); + + /* + * Fill in some infos for use by the kernel later on + */ + if (prom_memory_limit) { + __be64 val = cpu_to_be64(prom_memory_limit); + prom_setprop(prom.chosen, "/chosen", "linux,memory-limit", + &val, sizeof(val)); + } +#ifdef CONFIG_PPC64 + if (prom_iommu_off) + prom_setprop(prom.chosen, "/chosen", "linux,iommu-off", + NULL, 0); + + if (prom_iommu_force_on) + prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on", + NULL, 0); + + if (prom_tce_alloc_start) { + prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start", + &prom_tce_alloc_start, + sizeof(prom_tce_alloc_start)); + prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end", + &prom_tce_alloc_end, + sizeof(prom_tce_alloc_end)); + } +#endif + + /* + * Fixup any known bugs in the device-tree + */ + fixup_device_tree(); + + /* + * Now finally create the flattened device-tree + */ + prom_printf("copying OF device tree...\n"); + flatten_device_tree(); + + /* + * in case stdin is USB and still active on IBM machines... + * Unfortunately quiesce crashes on some powermacs if we have + * closed stdin already (in particular the powerbook 101). + */ + if (of_platform != PLATFORM_POWERMAC) + prom_close_stdin(); + + /* + * Call OF "quiesce" method to shut down pending DMA's from + * devices etc... + */ + prom_printf("Quiescing Open Firmware ...\n"); + call_prom("quiesce", 0, 0); + + /* + * And finally, call the kernel passing it the flattened device + * tree and NULL as r5, thus triggering the new entry point which + * is common to us and kexec + */ + hdr = dt_header_start; + + prom_printf("Booting Linux via __start() @ 0x%lx ...\n", kbase); + prom_debug("->dt_header_start=0x%lx\n", hdr); + +#ifdef CONFIG_PPC32 + reloc_got2(-offset); +#endif + + /* Move to secure memory if we're supposed to be secure guests. */ + setup_secure_guest(kbase, hdr); + + __start(hdr, kbase, 0, 0, 0, 0, 0); + + return 0; +} diff --git a/arch/powerpc/kernel/prom_init_check.sh b/arch/powerpc/kernel/prom_init_check.sh new file mode 100644 index 000000000..311890d71 --- /dev/null +++ b/arch/powerpc/kernel/prom_init_check.sh @@ -0,0 +1,90 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0-or-later +# +# Copyright © 2008 IBM Corporation +# + +# This script checks prom_init.o to see what external symbols it +# is using, if it finds symbols not in the whitelist it returns +# an error. The point of this is to discourage people from +# intentionally or accidentally adding new code to prom_init.c +# which has side effects on other parts of the kernel. + +# If you really need to reference something from prom_init.o add +# it to the list below: + +grep "^CONFIG_KASAN=y$" ${KCONFIG_CONFIG} >/dev/null +if [ $? -eq 0 ] +then + MEM_FUNCS="__memcpy __memset" +else + MEM_FUNCS="memcpy memset" +fi + +WHITELIST="add_reloc_offset __bss_start __bss_stop copy_and_flush +_end enter_prom $MEM_FUNCS reloc_offset __secondary_hold +__secondary_hold_acknowledge __secondary_hold_spinloop __start +logo_linux_clut224 btext_prepare_BAT +reloc_got2 kernstart_addr memstart_addr linux_banner _stext +btext_setup_display TOC. relocate" + +NM="$1" +OBJ="$2" + +ERROR=0 + +check_section() +{ + file=$1 + section=$2 + size=$(objdump -h -j $section $file 2>/dev/null | awk "\$2 == \"$section\" {print \$3}") + size=${size:-0} + if [ $size -ne 0 ]; then + ERROR=1 + echo "Error: Section $section not empty in prom_init.c" >&2 + fi +} + +for UNDEF in $($NM -u $OBJ | awk '{print $2}') +do + # On 64-bit nm gives us the function descriptors, which have + # a leading . on the name, so strip it off here. + UNDEF="${UNDEF#.}" + + if [ $KBUILD_VERBOSE ]; then + if [ $KBUILD_VERBOSE -ne 0 ]; then + echo "Checking prom_init.o symbol '$UNDEF'" + fi + fi + + OK=0 + for WHITE in $WHITELIST + do + if [ "$UNDEF" = "$WHITE" ]; then + OK=1 + break + fi + done + + # ignore register save/restore funcitons + case $UNDEF in + _restgpr_*|_restgpr0_*|_rest32gpr_*) + OK=1 + ;; + _savegpr_*|_savegpr0_*|_save32gpr_*) + OK=1 + ;; + esac + + if [ $OK -eq 0 ]; then + ERROR=1 + echo "Error: External symbol '$UNDEF' referenced" \ + "from prom_init.c" >&2 + fi +done + +check_section $OBJ .data +check_section $OBJ .bss +check_section $OBJ .init.data + +exit $ERROR diff --git a/arch/powerpc/kernel/prom_parse.c b/arch/powerpc/kernel/prom_parse.c new file mode 100644 index 000000000..9cb7f88df --- /dev/null +++ b/arch/powerpc/kernel/prom_parse.c @@ -0,0 +1,34 @@ +// SPDX-License-Identifier: GPL-2.0 +#undef DEBUG + +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/ioport.h> +#include <linux/etherdevice.h> +#include <linux/of_address.h> +#include <asm/prom.h> + +void of_parse_dma_window(struct device_node *dn, const __be32 *dma_window, + unsigned long *busno, unsigned long *phys, + unsigned long *size) +{ + u32 cells; + const __be32 *prop; + + /* busno is always one cell */ + *busno = of_read_number(dma_window, 1); + dma_window++; + + prop = of_get_property(dn, "ibm,#dma-address-cells", NULL); + if (!prop) + prop = of_get_property(dn, "#address-cells", NULL); + + cells = prop ? of_read_number(prop, 1) : of_n_addr_cells(dn); + *phys = of_read_number(dma_window, cells); + + dma_window += cells; + + prop = of_get_property(dn, "ibm,#dma-size-cells", NULL); + cells = prop ? of_read_number(prop, 1) : of_n_size_cells(dn); + *size = of_read_number(dma_window, cells); +} diff --git a/arch/powerpc/kernel/ptrace/Makefile b/arch/powerpc/kernel/ptrace/Makefile new file mode 100644 index 000000000..77abd1a5a --- /dev/null +++ b/arch/powerpc/kernel/ptrace/Makefile @@ -0,0 +1,21 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for the linux kernel. +# + +CFLAGS_ptrace-view.o += -DUTS_MACHINE='"$(UTS_MACHINE)"' + +obj-y += ptrace.o ptrace-view.o +obj-y += ptrace-fpu.o +obj-$(CONFIG_COMPAT) += ptrace32.o +obj-$(CONFIG_VSX) += ptrace-vsx.o +ifneq ($(CONFIG_VSX),y) +obj-y += ptrace-novsx.o +endif +obj-$(CONFIG_ALTIVEC) += ptrace-altivec.o +obj-$(CONFIG_SPE) += ptrace-spe.o +obj-$(CONFIG_PPC_TRANSACTIONAL_MEM) += ptrace-tm.o +obj-$(CONFIG_PPC_ADV_DEBUG_REGS) += ptrace-adv.o +ifneq ($(CONFIG_PPC_ADV_DEBUG_REGS),y) +obj-y += ptrace-noadv.o +endif diff --git a/arch/powerpc/kernel/ptrace/ptrace-adv.c b/arch/powerpc/kernel/ptrace/ptrace-adv.c new file mode 100644 index 000000000..399f5d94a --- /dev/null +++ b/arch/powerpc/kernel/ptrace/ptrace-adv.c @@ -0,0 +1,494 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <linux/regset.h> +#include <linux/hw_breakpoint.h> + +#include "ptrace-decl.h" + +void user_enable_single_step(struct task_struct *task) +{ + struct pt_regs *regs = task->thread.regs; + + if (regs != NULL) { + task->thread.debug.dbcr0 &= ~DBCR0_BT; + task->thread.debug.dbcr0 |= DBCR0_IDM | DBCR0_IC; + regs_set_return_msr(regs, regs->msr | MSR_DE); + } + set_tsk_thread_flag(task, TIF_SINGLESTEP); +} + +void user_enable_block_step(struct task_struct *task) +{ + struct pt_regs *regs = task->thread.regs; + + if (regs != NULL) { + task->thread.debug.dbcr0 &= ~DBCR0_IC; + task->thread.debug.dbcr0 = DBCR0_IDM | DBCR0_BT; + regs_set_return_msr(regs, regs->msr | MSR_DE); + } + set_tsk_thread_flag(task, TIF_SINGLESTEP); +} + +void user_disable_single_step(struct task_struct *task) +{ + struct pt_regs *regs = task->thread.regs; + + if (regs != NULL) { + /* + * The logic to disable single stepping should be as + * simple as turning off the Instruction Complete flag. + * And, after doing so, if all debug flags are off, turn + * off DBCR0(IDM) and MSR(DE) .... Torez + */ + task->thread.debug.dbcr0 &= ~(DBCR0_IC | DBCR0_BT); + /* + * Test to see if any of the DBCR_ACTIVE_EVENTS bits are set. + */ + if (!DBCR_ACTIVE_EVENTS(task->thread.debug.dbcr0, + task->thread.debug.dbcr1)) { + /* + * All debug events were off..... + */ + task->thread.debug.dbcr0 &= ~DBCR0_IDM; + regs_set_return_msr(regs, regs->msr & ~MSR_DE); + } + } + clear_tsk_thread_flag(task, TIF_SINGLESTEP); +} + +void ppc_gethwdinfo(struct ppc_debug_info *dbginfo) +{ + dbginfo->version = 1; + dbginfo->num_instruction_bps = CONFIG_PPC_ADV_DEBUG_IACS; + dbginfo->num_data_bps = CONFIG_PPC_ADV_DEBUG_DACS; + dbginfo->num_condition_regs = CONFIG_PPC_ADV_DEBUG_DVCS; + dbginfo->data_bp_alignment = 4; + dbginfo->sizeof_condition = 4; + dbginfo->features = PPC_DEBUG_FEATURE_INSN_BP_RANGE | + PPC_DEBUG_FEATURE_INSN_BP_MASK; + if (IS_ENABLED(CONFIG_PPC_ADV_DEBUG_DAC_RANGE)) + dbginfo->features |= PPC_DEBUG_FEATURE_DATA_BP_RANGE | + PPC_DEBUG_FEATURE_DATA_BP_MASK; +} + +int ptrace_get_debugreg(struct task_struct *child, unsigned long addr, + unsigned long __user *datalp) +{ + /* We only support one DABR and no IABRS at the moment */ + if (addr > 0) + return -EINVAL; + return put_user(child->thread.debug.dac1, datalp); +} + +int ptrace_set_debugreg(struct task_struct *task, unsigned long addr, unsigned long data) +{ + struct pt_regs *regs = task->thread.regs; +#ifdef CONFIG_HAVE_HW_BREAKPOINT + int ret; + struct thread_struct *thread = &task->thread; + struct perf_event *bp; + struct perf_event_attr attr; +#endif /* CONFIG_HAVE_HW_BREAKPOINT */ + + /* For ppc64 we support one DABR and no IABR's at the moment (ppc64). + * For embedded processors we support one DAC and no IAC's at the + * moment. + */ + if (addr > 0) + return -EINVAL; + + /* The bottom 3 bits in dabr are flags */ + if ((data & ~0x7UL) >= TASK_SIZE) + return -EIO; + + /* As described above, it was assumed 3 bits were passed with the data + * address, but we will assume only the mode bits will be passed + * as to not cause alignment restrictions for DAC-based processors. + */ + + /* DAC's hold the whole address without any mode flags */ + task->thread.debug.dac1 = data & ~0x3UL; + + if (task->thread.debug.dac1 == 0) { + dbcr_dac(task) &= ~(DBCR_DAC1R | DBCR_DAC1W); + if (!DBCR_ACTIVE_EVENTS(task->thread.debug.dbcr0, + task->thread.debug.dbcr1)) { + regs_set_return_msr(regs, regs->msr & ~MSR_DE); + task->thread.debug.dbcr0 &= ~DBCR0_IDM; + } + return 0; + } + + /* Read or Write bits must be set */ + + if (!(data & 0x3UL)) + return -EINVAL; + + /* Set the Internal Debugging flag (IDM bit 1) for the DBCR0 register */ + task->thread.debug.dbcr0 |= DBCR0_IDM; + + /* Check for write and read flags and set DBCR0 accordingly */ + dbcr_dac(task) &= ~(DBCR_DAC1R | DBCR_DAC1W); + if (data & 0x1UL) + dbcr_dac(task) |= DBCR_DAC1R; + if (data & 0x2UL) + dbcr_dac(task) |= DBCR_DAC1W; + regs_set_return_msr(regs, regs->msr | MSR_DE); + return 0; +} + +static long set_instruction_bp(struct task_struct *child, + struct ppc_hw_breakpoint *bp_info) +{ + int slot; + int slot1_in_use = ((child->thread.debug.dbcr0 & DBCR0_IAC1) != 0); + int slot2_in_use = ((child->thread.debug.dbcr0 & DBCR0_IAC2) != 0); + int slot3_in_use = ((child->thread.debug.dbcr0 & DBCR0_IAC3) != 0); + int slot4_in_use = ((child->thread.debug.dbcr0 & DBCR0_IAC4) != 0); + + if (dbcr_iac_range(child) & DBCR_IAC12MODE) + slot2_in_use = 1; + if (dbcr_iac_range(child) & DBCR_IAC34MODE) + slot4_in_use = 1; + + if (bp_info->addr >= TASK_SIZE) + return -EIO; + + if (bp_info->addr_mode != PPC_BREAKPOINT_MODE_EXACT) { + /* Make sure range is valid. */ + if (bp_info->addr2 >= TASK_SIZE) + return -EIO; + + /* We need a pair of IAC regsisters */ + if (!slot1_in_use && !slot2_in_use) { + slot = 1; + child->thread.debug.iac1 = bp_info->addr; + child->thread.debug.iac2 = bp_info->addr2; + child->thread.debug.dbcr0 |= DBCR0_IAC1; + if (bp_info->addr_mode == + PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE) + dbcr_iac_range(child) |= DBCR_IAC12X; + else + dbcr_iac_range(child) |= DBCR_IAC12I; +#if CONFIG_PPC_ADV_DEBUG_IACS > 2 + } else if ((!slot3_in_use) && (!slot4_in_use)) { + slot = 3; + child->thread.debug.iac3 = bp_info->addr; + child->thread.debug.iac4 = bp_info->addr2; + child->thread.debug.dbcr0 |= DBCR0_IAC3; + if (bp_info->addr_mode == + PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE) + dbcr_iac_range(child) |= DBCR_IAC34X; + else + dbcr_iac_range(child) |= DBCR_IAC34I; +#endif + } else { + return -ENOSPC; + } + } else { + /* We only need one. If possible leave a pair free in + * case a range is needed later + */ + if (!slot1_in_use) { + /* + * Don't use iac1 if iac1-iac2 are free and either + * iac3 or iac4 (but not both) are free + */ + if (slot2_in_use || slot3_in_use == slot4_in_use) { + slot = 1; + child->thread.debug.iac1 = bp_info->addr; + child->thread.debug.dbcr0 |= DBCR0_IAC1; + goto out; + } + } + if (!slot2_in_use) { + slot = 2; + child->thread.debug.iac2 = bp_info->addr; + child->thread.debug.dbcr0 |= DBCR0_IAC2; +#if CONFIG_PPC_ADV_DEBUG_IACS > 2 + } else if (!slot3_in_use) { + slot = 3; + child->thread.debug.iac3 = bp_info->addr; + child->thread.debug.dbcr0 |= DBCR0_IAC3; + } else if (!slot4_in_use) { + slot = 4; + child->thread.debug.iac4 = bp_info->addr; + child->thread.debug.dbcr0 |= DBCR0_IAC4; +#endif + } else { + return -ENOSPC; + } + } +out: + child->thread.debug.dbcr0 |= DBCR0_IDM; + regs_set_return_msr(child->thread.regs, child->thread.regs->msr | MSR_DE); + + return slot; +} + +static int del_instruction_bp(struct task_struct *child, int slot) +{ + switch (slot) { + case 1: + if ((child->thread.debug.dbcr0 & DBCR0_IAC1) == 0) + return -ENOENT; + + if (dbcr_iac_range(child) & DBCR_IAC12MODE) { + /* address range - clear slots 1 & 2 */ + child->thread.debug.iac2 = 0; + dbcr_iac_range(child) &= ~DBCR_IAC12MODE; + } + child->thread.debug.iac1 = 0; + child->thread.debug.dbcr0 &= ~DBCR0_IAC1; + break; + case 2: + if ((child->thread.debug.dbcr0 & DBCR0_IAC2) == 0) + return -ENOENT; + + if (dbcr_iac_range(child) & DBCR_IAC12MODE) + /* used in a range */ + return -EINVAL; + child->thread.debug.iac2 = 0; + child->thread.debug.dbcr0 &= ~DBCR0_IAC2; + break; +#if CONFIG_PPC_ADV_DEBUG_IACS > 2 + case 3: + if ((child->thread.debug.dbcr0 & DBCR0_IAC3) == 0) + return -ENOENT; + + if (dbcr_iac_range(child) & DBCR_IAC34MODE) { + /* address range - clear slots 3 & 4 */ + child->thread.debug.iac4 = 0; + dbcr_iac_range(child) &= ~DBCR_IAC34MODE; + } + child->thread.debug.iac3 = 0; + child->thread.debug.dbcr0 &= ~DBCR0_IAC3; + break; + case 4: + if ((child->thread.debug.dbcr0 & DBCR0_IAC4) == 0) + return -ENOENT; + + if (dbcr_iac_range(child) & DBCR_IAC34MODE) + /* Used in a range */ + return -EINVAL; + child->thread.debug.iac4 = 0; + child->thread.debug.dbcr0 &= ~DBCR0_IAC4; + break; +#endif + default: + return -EINVAL; + } + return 0; +} + +static int set_dac(struct task_struct *child, struct ppc_hw_breakpoint *bp_info) +{ + int byte_enable = + (bp_info->condition_mode >> PPC_BREAKPOINT_CONDITION_BE_SHIFT) + & 0xf; + int condition_mode = + bp_info->condition_mode & PPC_BREAKPOINT_CONDITION_MODE; + int slot; + + if (byte_enable && condition_mode == 0) + return -EINVAL; + + if (bp_info->addr >= TASK_SIZE) + return -EIO; + + if ((dbcr_dac(child) & (DBCR_DAC1R | DBCR_DAC1W)) == 0) { + slot = 1; + if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ) + dbcr_dac(child) |= DBCR_DAC1R; + if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE) + dbcr_dac(child) |= DBCR_DAC1W; + child->thread.debug.dac1 = (unsigned long)bp_info->addr; +#if CONFIG_PPC_ADV_DEBUG_DVCS > 0 + if (byte_enable) { + child->thread.debug.dvc1 = + (unsigned long)bp_info->condition_value; + child->thread.debug.dbcr2 |= + ((byte_enable << DBCR2_DVC1BE_SHIFT) | + (condition_mode << DBCR2_DVC1M_SHIFT)); + } +#endif +#ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE + } else if (child->thread.debug.dbcr2 & DBCR2_DAC12MODE) { + /* Both dac1 and dac2 are part of a range */ + return -ENOSPC; +#endif + } else if ((dbcr_dac(child) & (DBCR_DAC2R | DBCR_DAC2W)) == 0) { + slot = 2; + if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ) + dbcr_dac(child) |= DBCR_DAC2R; + if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE) + dbcr_dac(child) |= DBCR_DAC2W; + child->thread.debug.dac2 = (unsigned long)bp_info->addr; +#if CONFIG_PPC_ADV_DEBUG_DVCS > 0 + if (byte_enable) { + child->thread.debug.dvc2 = + (unsigned long)bp_info->condition_value; + child->thread.debug.dbcr2 |= + ((byte_enable << DBCR2_DVC2BE_SHIFT) | + (condition_mode << DBCR2_DVC2M_SHIFT)); + } +#endif + } else { + return -ENOSPC; + } + child->thread.debug.dbcr0 |= DBCR0_IDM; + regs_set_return_msr(child->thread.regs, child->thread.regs->msr | MSR_DE); + + return slot + 4; +} + +static int del_dac(struct task_struct *child, int slot) +{ + if (slot == 1) { + if ((dbcr_dac(child) & (DBCR_DAC1R | DBCR_DAC1W)) == 0) + return -ENOENT; + + child->thread.debug.dac1 = 0; + dbcr_dac(child) &= ~(DBCR_DAC1R | DBCR_DAC1W); +#ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE + if (child->thread.debug.dbcr2 & DBCR2_DAC12MODE) { + child->thread.debug.dac2 = 0; + child->thread.debug.dbcr2 &= ~DBCR2_DAC12MODE; + } + child->thread.debug.dbcr2 &= ~(DBCR2_DVC1M | DBCR2_DVC1BE); +#endif +#if CONFIG_PPC_ADV_DEBUG_DVCS > 0 + child->thread.debug.dvc1 = 0; +#endif + } else if (slot == 2) { + if ((dbcr_dac(child) & (DBCR_DAC2R | DBCR_DAC2W)) == 0) + return -ENOENT; + +#ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE + if (child->thread.debug.dbcr2 & DBCR2_DAC12MODE) + /* Part of a range */ + return -EINVAL; + child->thread.debug.dbcr2 &= ~(DBCR2_DVC2M | DBCR2_DVC2BE); +#endif +#if CONFIG_PPC_ADV_DEBUG_DVCS > 0 + child->thread.debug.dvc2 = 0; +#endif + child->thread.debug.dac2 = 0; + dbcr_dac(child) &= ~(DBCR_DAC2R | DBCR_DAC2W); + } else { + return -EINVAL; + } + + return 0; +} + +#ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE +static int set_dac_range(struct task_struct *child, + struct ppc_hw_breakpoint *bp_info) +{ + int mode = bp_info->addr_mode & PPC_BREAKPOINT_MODE_MASK; + + /* We don't allow range watchpoints to be used with DVC */ + if (bp_info->condition_mode) + return -EINVAL; + + /* + * Best effort to verify the address range. The user/supervisor bits + * prevent trapping in kernel space, but let's fail on an obvious bad + * range. The simple test on the mask is not fool-proof, and any + * exclusive range will spill over into kernel space. + */ + if (bp_info->addr >= TASK_SIZE) + return -EIO; + if (mode == PPC_BREAKPOINT_MODE_MASK) { + /* + * dac2 is a bitmask. Don't allow a mask that makes a + * kernel space address from a valid dac1 value + */ + if (~((unsigned long)bp_info->addr2) >= TASK_SIZE) + return -EIO; + } else { + /* + * For range breakpoints, addr2 must also be a valid address + */ + if (bp_info->addr2 >= TASK_SIZE) + return -EIO; + } + + if (child->thread.debug.dbcr0 & + (DBCR0_DAC1R | DBCR0_DAC1W | DBCR0_DAC2R | DBCR0_DAC2W)) + return -ENOSPC; + + if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ) + child->thread.debug.dbcr0 |= (DBCR0_DAC1R | DBCR0_IDM); + if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE) + child->thread.debug.dbcr0 |= (DBCR0_DAC1W | DBCR0_IDM); + child->thread.debug.dac1 = bp_info->addr; + child->thread.debug.dac2 = bp_info->addr2; + if (mode == PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE) + child->thread.debug.dbcr2 |= DBCR2_DAC12M; + else if (mode == PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE) + child->thread.debug.dbcr2 |= DBCR2_DAC12MX; + else /* PPC_BREAKPOINT_MODE_MASK */ + child->thread.debug.dbcr2 |= DBCR2_DAC12MM; + regs_set_return_msr(child->thread.regs, child->thread.regs->msr | MSR_DE); + + return 5; +} +#endif /* CONFIG_PPC_ADV_DEBUG_DAC_RANGE */ + +long ppc_set_hwdebug(struct task_struct *child, struct ppc_hw_breakpoint *bp_info) +{ + if (bp_info->version != 1) + return -ENOTSUPP; + /* + * Check for invalid flags and combinations + */ + if (bp_info->trigger_type == 0 || + (bp_info->trigger_type & ~(PPC_BREAKPOINT_TRIGGER_EXECUTE | + PPC_BREAKPOINT_TRIGGER_RW)) || + (bp_info->addr_mode & ~PPC_BREAKPOINT_MODE_MASK) || + (bp_info->condition_mode & + ~(PPC_BREAKPOINT_CONDITION_MODE | + PPC_BREAKPOINT_CONDITION_BE_ALL))) + return -EINVAL; +#if CONFIG_PPC_ADV_DEBUG_DVCS == 0 + if (bp_info->condition_mode != PPC_BREAKPOINT_CONDITION_NONE) + return -EINVAL; +#endif + + if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_EXECUTE) { + if (bp_info->trigger_type != PPC_BREAKPOINT_TRIGGER_EXECUTE || + bp_info->condition_mode != PPC_BREAKPOINT_CONDITION_NONE) + return -EINVAL; + return set_instruction_bp(child, bp_info); + } + if (bp_info->addr_mode == PPC_BREAKPOINT_MODE_EXACT) + return set_dac(child, bp_info); + +#ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE + return set_dac_range(child, bp_info); +#else + return -EINVAL; +#endif +} + +long ppc_del_hwdebug(struct task_struct *child, long data) +{ + int rc; + + if (data <= 4) + rc = del_instruction_bp(child, (int)data); + else + rc = del_dac(child, (int)data - 4); + + if (!rc) { + if (!DBCR_ACTIVE_EVENTS(child->thread.debug.dbcr0, + child->thread.debug.dbcr1)) { + child->thread.debug.dbcr0 &= ~DBCR0_IDM; + regs_set_return_msr(child->thread.regs, + child->thread.regs->msr & ~MSR_DE); + } + } + return rc; +} diff --git a/arch/powerpc/kernel/ptrace/ptrace-altivec.c b/arch/powerpc/kernel/ptrace/ptrace-altivec.c new file mode 100644 index 000000000..0d9bc4bd4 --- /dev/null +++ b/arch/powerpc/kernel/ptrace/ptrace-altivec.c @@ -0,0 +1,115 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <linux/regset.h> +#include <linux/elf.h> + +#include <asm/switch_to.h> + +#include "ptrace-decl.h" + +/* + * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go. + * The transfer totals 34 quadword. Quadwords 0-31 contain the + * corresponding vector registers. Quadword 32 contains the vscr as the + * last word (offset 12) within that quadword. Quadword 33 contains the + * vrsave as the first word (offset 0) within the quadword. + * + * This definition of the VMX state is compatible with the current PPC32 + * ptrace interface. This allows signal handling and ptrace to use the + * same structures. This also simplifies the implementation of a bi-arch + * (combined (32- and 64-bit) gdb. + */ + +int vr_active(struct task_struct *target, const struct user_regset *regset) +{ + flush_altivec_to_thread(target); + return target->thread.used_vr ? regset->n : 0; +} + +/* + * Regardless of transactions, 'vr_state' holds the current running + * value of all the VMX registers and 'ckvr_state' holds the last + * checkpointed value of all the VMX registers for the current + * transaction to fall back on in case it aborts. + * + * Userspace interface buffer layout: + * + * struct data { + * vector128 vr[32]; + * vector128 vscr; + * vector128 vrsave; + * }; + */ +int vr_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + union { + elf_vrreg_t reg; + u32 word; + } vrsave; + + flush_altivec_to_thread(target); + + BUILD_BUG_ON(offsetof(struct thread_vr_state, vscr) != + offsetof(struct thread_vr_state, vr[32])); + + membuf_write(&to, &target->thread.vr_state, 33 * sizeof(vector128)); + /* + * Copy out only the low-order word of vrsave. + */ + memset(&vrsave, 0, sizeof(vrsave)); + vrsave.word = target->thread.vrsave; + return membuf_write(&to, &vrsave, sizeof(vrsave)); +} + +/* + * Regardless of transactions, 'vr_state' holds the current running + * value of all the VMX registers and 'ckvr_state' holds the last + * checkpointed value of all the VMX registers for the current + * transaction to fall back on in case it aborts. + * + * Userspace interface buffer layout: + * + * struct data { + * vector128 vr[32]; + * vector128 vscr; + * vector128 vrsave; + * }; + */ +int vr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + int ret; + + flush_altivec_to_thread(target); + + BUILD_BUG_ON(offsetof(struct thread_vr_state, vscr) != + offsetof(struct thread_vr_state, vr[32])); + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.vr_state, 0, + 33 * sizeof(vector128)); + if (!ret && count > 0) { + /* + * We use only the first word of vrsave. + */ + int start, end; + union { + elf_vrreg_t reg; + u32 word; + } vrsave; + memset(&vrsave, 0, sizeof(vrsave)); + + vrsave.word = target->thread.vrsave; + + start = 33 * sizeof(vector128); + end = start + sizeof(vrsave); + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &vrsave, + start, end); + if (!ret) + target->thread.vrsave = vrsave.word; + } + + return ret; +} diff --git a/arch/powerpc/kernel/ptrace/ptrace-decl.h b/arch/powerpc/kernel/ptrace/ptrace-decl.h new file mode 100644 index 000000000..eafe5f0f6 --- /dev/null +++ b/arch/powerpc/kernel/ptrace/ptrace-decl.h @@ -0,0 +1,177 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +/* + * Set of msr bits that gdb can change on behalf of a process. + */ +#ifdef CONFIG_PPC_ADV_DEBUG_REGS +#define MSR_DEBUGCHANGE 0 +#else +#define MSR_DEBUGCHANGE (MSR_SE | MSR_BE) +#endif + +/* + * Max register writeable via put_reg + */ +#ifdef CONFIG_PPC32 +#define PT_MAX_PUT_REG PT_MQ +#else +#define PT_MAX_PUT_REG PT_CCR +#endif + +#define TVSO(f) (offsetof(struct thread_vr_state, f)) +#define TFSO(f) (offsetof(struct thread_fp_state, f)) +#define TSO(f) (offsetof(struct thread_struct, f)) + +/* + * These are our native regset flavors. + */ +enum powerpc_regset { + REGSET_GPR, + REGSET_FPR, +#ifdef CONFIG_ALTIVEC + REGSET_VMX, +#endif +#ifdef CONFIG_VSX + REGSET_VSX, +#endif +#ifdef CONFIG_SPE + REGSET_SPE, +#endif +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + REGSET_TM_CGPR, /* TM checkpointed GPR registers */ + REGSET_TM_CFPR, /* TM checkpointed FPR registers */ + REGSET_TM_CVMX, /* TM checkpointed VMX registers */ + REGSET_TM_CVSX, /* TM checkpointed VSX registers */ + REGSET_TM_SPR, /* TM specific SPR registers */ + REGSET_TM_CTAR, /* TM checkpointed TAR register */ + REGSET_TM_CPPR, /* TM checkpointed PPR register */ + REGSET_TM_CDSCR, /* TM checkpointed DSCR register */ +#endif +#ifdef CONFIG_PPC64 + REGSET_PPR, /* PPR register */ + REGSET_DSCR, /* DSCR register */ +#endif +#ifdef CONFIG_PPC_BOOK3S_64 + REGSET_TAR, /* TAR register */ + REGSET_EBB, /* EBB registers */ + REGSET_PMR, /* Performance Monitor Registers */ +#endif +#ifdef CONFIG_PPC_MEM_KEYS + REGSET_PKEY, /* AMR register */ +#endif +}; + +/* ptrace-(no)vsx */ + +user_regset_get2_fn fpr_get; +int fpr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf); + +/* ptrace-vsx */ + +int vsr_active(struct task_struct *target, const struct user_regset *regset); +user_regset_get2_fn vsr_get; +int vsr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf); + +/* ptrace-altivec */ + +int vr_active(struct task_struct *target, const struct user_regset *regset); +user_regset_get2_fn vr_get; +int vr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf); + +/* ptrace-spe */ + +int evr_active(struct task_struct *target, const struct user_regset *regset); +user_regset_get2_fn evr_get; +int evr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf); + +/* ptrace */ + +int gpr32_get_common(struct task_struct *target, + const struct user_regset *regset, + struct membuf to, + unsigned long *regs); +int gpr32_set_common(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf, + unsigned long *regs); + +/* ptrace-tm */ + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +void flush_tmregs_to_thread(struct task_struct *tsk); +#else +static inline void flush_tmregs_to_thread(struct task_struct *tsk) { } +#endif + +int tm_cgpr_active(struct task_struct *target, const struct user_regset *regset); +user_regset_get2_fn tm_cgpr_get; +int tm_cgpr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf); +int tm_cfpr_active(struct task_struct *target, const struct user_regset *regset); +user_regset_get2_fn tm_cfpr_get; +int tm_cfpr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf); +int tm_cvmx_active(struct task_struct *target, const struct user_regset *regset); +user_regset_get2_fn tm_cvmx_get; +int tm_cvmx_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf); +int tm_cvsx_active(struct task_struct *target, const struct user_regset *regset); +user_regset_get2_fn tm_cvsx_get; +int tm_cvsx_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf); +int tm_spr_active(struct task_struct *target, const struct user_regset *regset); +user_regset_get2_fn tm_spr_get; +int tm_spr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf); +int tm_tar_active(struct task_struct *target, const struct user_regset *regset); +user_regset_get2_fn tm_tar_get; +int tm_tar_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf); +int tm_ppr_active(struct task_struct *target, const struct user_regset *regset); +user_regset_get2_fn tm_ppr_get; +int tm_ppr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf); +int tm_dscr_active(struct task_struct *target, const struct user_regset *regset); +user_regset_get2_fn tm_dscr_get; +int tm_dscr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf); +user_regset_get2_fn tm_cgpr32_get; +int tm_cgpr32_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf); + +/* ptrace-view */ + +int ptrace_get_reg(struct task_struct *task, int regno, unsigned long *data); +int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data); + +extern const struct user_regset_view user_ppc_native_view; + +/* ptrace-fpu */ +int ptrace_get_fpr(struct task_struct *child, int index, unsigned long *data); +int ptrace_put_fpr(struct task_struct *child, int index, unsigned long data); + +/* ptrace-(no)adv */ +void ppc_gethwdinfo(struct ppc_debug_info *dbginfo); +int ptrace_get_debugreg(struct task_struct *child, unsigned long addr, + unsigned long __user *datalp); +int ptrace_set_debugreg(struct task_struct *task, unsigned long addr, unsigned long data); +long ppc_set_hwdebug(struct task_struct *child, struct ppc_hw_breakpoint *bp_info); +long ppc_del_hwdebug(struct task_struct *child, long data); diff --git a/arch/powerpc/kernel/ptrace/ptrace-fpu.c b/arch/powerpc/kernel/ptrace/ptrace-fpu.c new file mode 100644 index 000000000..09c49632b --- /dev/null +++ b/arch/powerpc/kernel/ptrace/ptrace-fpu.c @@ -0,0 +1,58 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <linux/regset.h> + +#include <asm/switch_to.h> + +#include "ptrace-decl.h" + +int ptrace_get_fpr(struct task_struct *child, int index, unsigned long *data) +{ +#ifdef CONFIG_PPC_FPU_REGS + unsigned int fpidx = index - PT_FPR0; +#endif + + if (index > PT_FPSCR) + return -EIO; + +#ifdef CONFIG_PPC_FPU_REGS + flush_fp_to_thread(child); + if (fpidx < (PT_FPSCR - PT_FPR0)) { + if (IS_ENABLED(CONFIG_PPC32)) + // On 32-bit the index we are passed refers to 32-bit words + *data = ((u32 *)child->thread.fp_state.fpr)[fpidx]; + else + memcpy(data, &child->thread.TS_FPR(fpidx), sizeof(long)); + } else + *data = child->thread.fp_state.fpscr; +#else + *data = 0; +#endif + + return 0; +} + +int ptrace_put_fpr(struct task_struct *child, int index, unsigned long data) +{ +#ifdef CONFIG_PPC_FPU_REGS + unsigned int fpidx = index - PT_FPR0; +#endif + + if (index > PT_FPSCR) + return -EIO; + +#ifdef CONFIG_PPC_FPU_REGS + flush_fp_to_thread(child); + if (fpidx < (PT_FPSCR - PT_FPR0)) { + if (IS_ENABLED(CONFIG_PPC32)) + // On 32-bit the index we are passed refers to 32-bit words + ((u32 *)child->thread.fp_state.fpr)[fpidx] = data; + else + memcpy(&child->thread.TS_FPR(fpidx), &data, sizeof(long)); + } else + child->thread.fp_state.fpscr = data; +#endif + + return 0; +} + diff --git a/arch/powerpc/kernel/ptrace/ptrace-noadv.c b/arch/powerpc/kernel/ptrace/ptrace-noadv.c new file mode 100644 index 000000000..a5dd7d2e2 --- /dev/null +++ b/arch/powerpc/kernel/ptrace/ptrace-noadv.c @@ -0,0 +1,298 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <linux/regset.h> +#include <linux/hw_breakpoint.h> + +#include <asm/debug.h> + +#include "ptrace-decl.h" + +void user_enable_single_step(struct task_struct *task) +{ + struct pt_regs *regs = task->thread.regs; + + if (regs != NULL) + regs_set_return_msr(regs, (regs->msr & ~MSR_BE) | MSR_SE); + set_tsk_thread_flag(task, TIF_SINGLESTEP); +} + +void user_enable_block_step(struct task_struct *task) +{ + struct pt_regs *regs = task->thread.regs; + + if (regs != NULL) + regs_set_return_msr(regs, (regs->msr & ~MSR_SE) | MSR_BE); + set_tsk_thread_flag(task, TIF_SINGLESTEP); +} + +void user_disable_single_step(struct task_struct *task) +{ + struct pt_regs *regs = task->thread.regs; + + if (regs != NULL) + regs_set_return_msr(regs, regs->msr & ~(MSR_SE | MSR_BE)); + + clear_tsk_thread_flag(task, TIF_SINGLESTEP); +} + +void ppc_gethwdinfo(struct ppc_debug_info *dbginfo) +{ + dbginfo->version = 1; + dbginfo->num_instruction_bps = 0; + if (ppc_breakpoint_available()) + dbginfo->num_data_bps = nr_wp_slots(); + else + dbginfo->num_data_bps = 0; + dbginfo->num_condition_regs = 0; + dbginfo->data_bp_alignment = sizeof(long); + dbginfo->sizeof_condition = 0; + if (IS_ENABLED(CONFIG_HAVE_HW_BREAKPOINT)) { + dbginfo->features = PPC_DEBUG_FEATURE_DATA_BP_RANGE; + if (dawr_enabled()) + dbginfo->features |= PPC_DEBUG_FEATURE_DATA_BP_DAWR; + } else { + dbginfo->features = 0; + } + if (cpu_has_feature(CPU_FTR_ARCH_31)) + dbginfo->features |= PPC_DEBUG_FEATURE_DATA_BP_ARCH_31; +} + +int ptrace_get_debugreg(struct task_struct *child, unsigned long addr, + unsigned long __user *datalp) +{ + unsigned long dabr_fake; + + /* We only support one DABR and no IABRS at the moment */ + if (addr > 0) + return -EINVAL; + dabr_fake = ((child->thread.hw_brk[0].address & (~HW_BRK_TYPE_DABR)) | + (child->thread.hw_brk[0].type & HW_BRK_TYPE_DABR)); + return put_user(dabr_fake, datalp); +} + +/* + * ptrace_set_debugreg() fakes DABR and DABR is only one. So even if + * internal hw supports more than one watchpoint, we support only one + * watchpoint with this interface. + */ +int ptrace_set_debugreg(struct task_struct *task, unsigned long addr, unsigned long data) +{ +#ifdef CONFIG_HAVE_HW_BREAKPOINT + int ret; + struct thread_struct *thread = &task->thread; + struct perf_event *bp; + struct perf_event_attr attr; +#endif /* CONFIG_HAVE_HW_BREAKPOINT */ + bool set_bp = true; + struct arch_hw_breakpoint hw_brk; + + /* For ppc64 we support one DABR and no IABR's at the moment (ppc64). + * For embedded processors we support one DAC and no IAC's at the + * moment. + */ + if (addr > 0) + return -EINVAL; + + /* The bottom 3 bits in dabr are flags */ + if ((data & ~0x7UL) >= TASK_SIZE) + return -EIO; + + /* For processors using DABR (i.e. 970), the bottom 3 bits are flags. + * It was assumed, on previous implementations, that 3 bits were + * passed together with the data address, fitting the design of the + * DABR register, as follows: + * + * bit 0: Read flag + * bit 1: Write flag + * bit 2: Breakpoint translation + * + * Thus, we use them here as so. + */ + + /* Ensure breakpoint translation bit is set */ + if (data && !(data & HW_BRK_TYPE_TRANSLATE)) + return -EIO; + hw_brk.address = data & (~HW_BRK_TYPE_DABR); + hw_brk.type = (data & HW_BRK_TYPE_DABR) | HW_BRK_TYPE_PRIV_ALL; + hw_brk.len = DABR_MAX_LEN; + hw_brk.hw_len = DABR_MAX_LEN; + set_bp = (data) && (hw_brk.type & HW_BRK_TYPE_RDWR); +#ifdef CONFIG_HAVE_HW_BREAKPOINT + bp = thread->ptrace_bps[0]; + if (!set_bp) { + if (bp) { + unregister_hw_breakpoint(bp); + thread->ptrace_bps[0] = NULL; + } + return 0; + } + if (bp) { + attr = bp->attr; + attr.bp_addr = hw_brk.address; + attr.bp_len = DABR_MAX_LEN; + arch_bp_generic_fields(hw_brk.type, &attr.bp_type); + + /* Enable breakpoint */ + attr.disabled = false; + + ret = modify_user_hw_breakpoint(bp, &attr); + if (ret) + return ret; + + thread->ptrace_bps[0] = bp; + thread->hw_brk[0] = hw_brk; + return 0; + } + + /* Create a new breakpoint request if one doesn't exist already */ + hw_breakpoint_init(&attr); + attr.bp_addr = hw_brk.address; + attr.bp_len = DABR_MAX_LEN; + arch_bp_generic_fields(hw_brk.type, + &attr.bp_type); + + thread->ptrace_bps[0] = bp = register_user_hw_breakpoint(&attr, + ptrace_triggered, NULL, task); + if (IS_ERR(bp)) { + thread->ptrace_bps[0] = NULL; + return PTR_ERR(bp); + } + +#else /* !CONFIG_HAVE_HW_BREAKPOINT */ + if (set_bp && (!ppc_breakpoint_available())) + return -ENODEV; +#endif /* CONFIG_HAVE_HW_BREAKPOINT */ + task->thread.hw_brk[0] = hw_brk; + return 0; +} + +#ifdef CONFIG_HAVE_HW_BREAKPOINT +static int find_empty_ptrace_bp(struct thread_struct *thread) +{ + int i; + + for (i = 0; i < nr_wp_slots(); i++) { + if (!thread->ptrace_bps[i]) + return i; + } + return -1; +} +#endif + +static int find_empty_hw_brk(struct thread_struct *thread) +{ + int i; + + for (i = 0; i < nr_wp_slots(); i++) { + if (!thread->hw_brk[i].address) + return i; + } + return -1; +} + +long ppc_set_hwdebug(struct task_struct *child, struct ppc_hw_breakpoint *bp_info) +{ + int i; +#ifdef CONFIG_HAVE_HW_BREAKPOINT + int len = 0; + struct thread_struct *thread = &child->thread; + struct perf_event *bp; + struct perf_event_attr attr; +#endif /* CONFIG_HAVE_HW_BREAKPOINT */ + struct arch_hw_breakpoint brk; + + if (bp_info->version != 1) + return -ENOTSUPP; + /* + * We only support one data breakpoint + */ + if ((bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_RW) == 0 || + (bp_info->trigger_type & ~PPC_BREAKPOINT_TRIGGER_RW) != 0 || + bp_info->condition_mode != PPC_BREAKPOINT_CONDITION_NONE) + return -EINVAL; + + if ((unsigned long)bp_info->addr >= TASK_SIZE) + return -EIO; + + brk.address = ALIGN_DOWN(bp_info->addr, HW_BREAKPOINT_SIZE); + brk.type = HW_BRK_TYPE_TRANSLATE | HW_BRK_TYPE_PRIV_ALL; + brk.len = DABR_MAX_LEN; + brk.hw_len = DABR_MAX_LEN; + if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ) + brk.type |= HW_BRK_TYPE_READ; + if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE) + brk.type |= HW_BRK_TYPE_WRITE; +#ifdef CONFIG_HAVE_HW_BREAKPOINT + if (bp_info->addr_mode == PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE) + len = bp_info->addr2 - bp_info->addr; + else if (bp_info->addr_mode == PPC_BREAKPOINT_MODE_EXACT) + len = 1; + else + return -EINVAL; + + i = find_empty_ptrace_bp(thread); + if (i < 0) + return -ENOSPC; + + /* Create a new breakpoint request if one doesn't exist already */ + hw_breakpoint_init(&attr); + attr.bp_addr = (unsigned long)bp_info->addr; + attr.bp_len = len; + arch_bp_generic_fields(brk.type, &attr.bp_type); + + bp = register_user_hw_breakpoint(&attr, ptrace_triggered, NULL, child); + thread->ptrace_bps[i] = bp; + if (IS_ERR(bp)) { + thread->ptrace_bps[i] = NULL; + return PTR_ERR(bp); + } + + return i + 1; +#endif /* CONFIG_HAVE_HW_BREAKPOINT */ + + if (bp_info->addr_mode != PPC_BREAKPOINT_MODE_EXACT) + return -EINVAL; + + i = find_empty_hw_brk(&child->thread); + if (i < 0) + return -ENOSPC; + + if (!ppc_breakpoint_available()) + return -ENODEV; + + child->thread.hw_brk[i] = brk; + + return i + 1; +} + +long ppc_del_hwdebug(struct task_struct *child, long data) +{ +#ifdef CONFIG_HAVE_HW_BREAKPOINT + int ret = 0; + struct thread_struct *thread = &child->thread; + struct perf_event *bp; +#endif /* CONFIG_HAVE_HW_BREAKPOINT */ + if (data < 1 || data > nr_wp_slots()) + return -EINVAL; + +#ifdef CONFIG_HAVE_HW_BREAKPOINT + bp = thread->ptrace_bps[data - 1]; + if (bp) { + unregister_hw_breakpoint(bp); + thread->ptrace_bps[data - 1] = NULL; + } else { + ret = -ENOENT; + } + return ret; +#else /* CONFIG_HAVE_HW_BREAKPOINT */ + if (!(child->thread.hw_brk[data - 1].flags & HW_BRK_FLAG_DISABLED) && + child->thread.hw_brk[data - 1].address == 0) + return -ENOENT; + + child->thread.hw_brk[data - 1].address = 0; + child->thread.hw_brk[data - 1].type = 0; + child->thread.hw_brk[data - 1].flags = 0; +#endif /* CONFIG_HAVE_HW_BREAKPOINT */ + + return 0; +} diff --git a/arch/powerpc/kernel/ptrace/ptrace-novsx.c b/arch/powerpc/kernel/ptrace/ptrace-novsx.c new file mode 100644 index 000000000..7433f3db9 --- /dev/null +++ b/arch/powerpc/kernel/ptrace/ptrace-novsx.c @@ -0,0 +1,64 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <linux/regset.h> + +#include <asm/switch_to.h> + +#include "ptrace-decl.h" + +/* + * Regardless of transactions, 'fp_state' holds the current running + * value of all FPR registers and 'ckfp_state' holds the last checkpointed + * value of all FPR registers for the current transaction. + * + * Userspace interface buffer layout: + * + * struct data { + * u64 fpr[32]; + * u64 fpscr; + * }; + */ +int fpr_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ +#ifdef CONFIG_PPC_FPU_REGS + BUILD_BUG_ON(offsetof(struct thread_fp_state, fpscr) != + offsetof(struct thread_fp_state, fpr[32])); + + flush_fp_to_thread(target); + + return membuf_write(&to, &target->thread.fp_state, 33 * sizeof(u64)); +#else + return membuf_write(&to, &empty_zero_page, 33 * sizeof(u64)); +#endif +} + +/* + * Regardless of transactions, 'fp_state' holds the current running + * value of all FPR registers and 'ckfp_state' holds the last checkpointed + * value of all FPR registers for the current transaction. + * + * Userspace interface buffer layout: + * + * struct data { + * u64 fpr[32]; + * u64 fpscr; + * }; + * + */ +int fpr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ +#ifdef CONFIG_PPC_FPU_REGS + BUILD_BUG_ON(offsetof(struct thread_fp_state, fpscr) != + offsetof(struct thread_fp_state, fpr[32])); + + flush_fp_to_thread(target); + + return user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.fp_state, 0, -1); +#else + return 0; +#endif +} diff --git a/arch/powerpc/kernel/ptrace/ptrace-spe.c b/arch/powerpc/kernel/ptrace/ptrace-spe.c new file mode 100644 index 000000000..47034d069 --- /dev/null +++ b/arch/powerpc/kernel/ptrace/ptrace-spe.c @@ -0,0 +1,60 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <linux/regset.h> + +#include <asm/switch_to.h> + +#include "ptrace-decl.h" + +/* + * For get_evrregs/set_evrregs functions 'data' has the following layout: + * + * struct { + * u32 evr[32]; + * u64 acc; + * u32 spefscr; + * } + */ + +int evr_active(struct task_struct *target, const struct user_regset *regset) +{ + flush_spe_to_thread(target); + return target->thread.used_spe ? regset->n : 0; +} + +int evr_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + flush_spe_to_thread(target); + + membuf_write(&to, &target->thread.evr, sizeof(target->thread.evr)); + + BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) != + offsetof(struct thread_struct, spefscr)); + + return membuf_write(&to, &target->thread.acc, + sizeof(u64) + sizeof(u32)); +} + +int evr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + int ret; + + flush_spe_to_thread(target); + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.evr, + 0, sizeof(target->thread.evr)); + + BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) != + offsetof(struct thread_struct, spefscr)); + + if (!ret) + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.acc, + sizeof(target->thread.evr), -1); + + return ret; +} diff --git a/arch/powerpc/kernel/ptrace/ptrace-tm.c b/arch/powerpc/kernel/ptrace/ptrace-tm.c new file mode 100644 index 000000000..44045363a --- /dev/null +++ b/arch/powerpc/kernel/ptrace/ptrace-tm.c @@ -0,0 +1,788 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <linux/regset.h> + +#include <asm/switch_to.h> +#include <asm/tm.h> +#include <asm/asm-prototypes.h> + +#include "ptrace-decl.h" + +void flush_tmregs_to_thread(struct task_struct *tsk) +{ + /* + * If task is not current, it will have been flushed already to + * it's thread_struct during __switch_to(). + * + * A reclaim flushes ALL the state or if not in TM save TM SPRs + * in the appropriate thread structures from live. + */ + + if (!cpu_has_feature(CPU_FTR_TM) || tsk != current) + return; + + if (MSR_TM_SUSPENDED(mfmsr())) { + tm_reclaim_current(TM_CAUSE_SIGNAL); + } else { + tm_enable(); + tm_save_sprs(&tsk->thread); + } +} + +static unsigned long get_user_ckpt_msr(struct task_struct *task) +{ + return task->thread.ckpt_regs.msr | task->thread.fpexc_mode; +} + +static int set_user_ckpt_msr(struct task_struct *task, unsigned long msr) +{ + task->thread.ckpt_regs.msr &= ~MSR_DEBUGCHANGE; + task->thread.ckpt_regs.msr |= msr & MSR_DEBUGCHANGE; + return 0; +} + +static int set_user_ckpt_trap(struct task_struct *task, unsigned long trap) +{ + set_trap(&task->thread.ckpt_regs, trap); + return 0; +} + +/** + * tm_cgpr_active - get active number of registers in CGPR + * @target: The target task. + * @regset: The user regset structure. + * + * This function checks for the active number of available + * regisers in transaction checkpointed GPR category. + */ +int tm_cgpr_active(struct task_struct *target, const struct user_regset *regset) +{ + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (!MSR_TM_ACTIVE(target->thread.regs->msr)) + return 0; + + return regset->n; +} + +/** + * tm_cgpr_get - get CGPR registers + * @target: The target task. + * @regset: The user regset structure. + * @to: Destination of copy. + * + * This function gets transaction checkpointed GPR registers. + * + * When the transaction is active, 'ckpt_regs' holds all the checkpointed + * GPR register values for the current transaction to fall back on if it + * aborts in between. This function gets those checkpointed GPR registers. + * The userspace interface buffer layout is as follows. + * + * struct data { + * struct pt_regs ckpt_regs; + * }; + */ +int tm_cgpr_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + struct membuf to_msr = membuf_at(&to, offsetof(struct pt_regs, msr)); +#ifdef CONFIG_PPC64 + struct membuf to_softe = membuf_at(&to, offsetof(struct pt_regs, softe)); +#endif + + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (!MSR_TM_ACTIVE(target->thread.regs->msr)) + return -ENODATA; + + flush_tmregs_to_thread(target); + flush_fp_to_thread(target); + flush_altivec_to_thread(target); + + membuf_write(&to, &target->thread.ckpt_regs, sizeof(struct user_pt_regs)); + + membuf_store(&to_msr, get_user_ckpt_msr(target)); +#ifdef CONFIG_PPC64 + membuf_store(&to_softe, 0x1ul); +#endif + return membuf_zero(&to, ELF_NGREG * sizeof(unsigned long) - + sizeof(struct user_pt_regs)); +} + +/* + * tm_cgpr_set - set the CGPR registers + * @target: The target task. + * @regset: The user regset structure. + * @pos: The buffer position. + * @count: Number of bytes to copy. + * @kbuf: Kernel buffer to copy into. + * @ubuf: User buffer to copy from. + * + * This function sets in transaction checkpointed GPR registers. + * + * When the transaction is active, 'ckpt_regs' holds the checkpointed + * GPR register values for the current transaction to fall back on if it + * aborts in between. This function sets those checkpointed GPR registers. + * The userspace interface buffer layout is as follows. + * + * struct data { + * struct pt_regs ckpt_regs; + * }; + */ +int tm_cgpr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + unsigned long reg; + int ret; + + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (!MSR_TM_ACTIVE(target->thread.regs->msr)) + return -ENODATA; + + flush_tmregs_to_thread(target); + flush_fp_to_thread(target); + flush_altivec_to_thread(target); + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.ckpt_regs, + 0, PT_MSR * sizeof(reg)); + + if (!ret && count > 0) { + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®, + PT_MSR * sizeof(reg), + (PT_MSR + 1) * sizeof(reg)); + if (!ret) + ret = set_user_ckpt_msr(target, reg); + } + + BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) != + offsetof(struct pt_regs, msr) + sizeof(long)); + + if (!ret) + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.ckpt_regs.orig_gpr3, + PT_ORIG_R3 * sizeof(reg), + (PT_MAX_PUT_REG + 1) * sizeof(reg)); + + if (PT_MAX_PUT_REG + 1 < PT_TRAP && !ret) + ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, + (PT_MAX_PUT_REG + 1) * sizeof(reg), + PT_TRAP * sizeof(reg)); + + if (!ret && count > 0) { + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®, + PT_TRAP * sizeof(reg), + (PT_TRAP + 1) * sizeof(reg)); + if (!ret) + ret = set_user_ckpt_trap(target, reg); + } + + if (!ret) + ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, + (PT_TRAP + 1) * sizeof(reg), -1); + + return ret; +} + +/** + * tm_cfpr_active - get active number of registers in CFPR + * @target: The target task. + * @regset: The user regset structure. + * + * This function checks for the active number of available + * regisers in transaction checkpointed FPR category. + */ +int tm_cfpr_active(struct task_struct *target, const struct user_regset *regset) +{ + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (!MSR_TM_ACTIVE(target->thread.regs->msr)) + return 0; + + return regset->n; +} + +/** + * tm_cfpr_get - get CFPR registers + * @target: The target task. + * @regset: The user regset structure. + * @to: Destination of copy. + * + * This function gets in transaction checkpointed FPR registers. + * + * When the transaction is active 'ckfp_state' holds the checkpointed + * values for the current transaction to fall back on if it aborts + * in between. This function gets those checkpointed FPR registers. + * The userspace interface buffer layout is as follows. + * + * struct data { + * u64 fpr[32]; + * u64 fpscr; + *}; + */ +int tm_cfpr_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + u64 buf[33]; + int i; + + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (!MSR_TM_ACTIVE(target->thread.regs->msr)) + return -ENODATA; + + flush_tmregs_to_thread(target); + flush_fp_to_thread(target); + flush_altivec_to_thread(target); + + /* copy to local buffer then write that out */ + for (i = 0; i < 32 ; i++) + buf[i] = target->thread.TS_CKFPR(i); + buf[32] = target->thread.ckfp_state.fpscr; + return membuf_write(&to, buf, sizeof(buf)); +} + +/** + * tm_cfpr_set - set CFPR registers + * @target: The target task. + * @regset: The user regset structure. + * @pos: The buffer position. + * @count: Number of bytes to copy. + * @kbuf: Kernel buffer to copy into. + * @ubuf: User buffer to copy from. + * + * This function sets in transaction checkpointed FPR registers. + * + * When the transaction is active 'ckfp_state' holds the checkpointed + * FPR register values for the current transaction to fall back on + * if it aborts in between. This function sets these checkpointed + * FPR registers. The userspace interface buffer layout is as follows. + * + * struct data { + * u64 fpr[32]; + * u64 fpscr; + *}; + */ +int tm_cfpr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + u64 buf[33]; + int i; + + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (!MSR_TM_ACTIVE(target->thread.regs->msr)) + return -ENODATA; + + flush_tmregs_to_thread(target); + flush_fp_to_thread(target); + flush_altivec_to_thread(target); + + for (i = 0; i < 32; i++) + buf[i] = target->thread.TS_CKFPR(i); + buf[32] = target->thread.ckfp_state.fpscr; + + /* copy to local buffer then write that out */ + i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1); + if (i) + return i; + for (i = 0; i < 32 ; i++) + target->thread.TS_CKFPR(i) = buf[i]; + target->thread.ckfp_state.fpscr = buf[32]; + return 0; +} + +/** + * tm_cvmx_active - get active number of registers in CVMX + * @target: The target task. + * @regset: The user regset structure. + * + * This function checks for the active number of available + * regisers in checkpointed VMX category. + */ +int tm_cvmx_active(struct task_struct *target, const struct user_regset *regset) +{ + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (!MSR_TM_ACTIVE(target->thread.regs->msr)) + return 0; + + return regset->n; +} + +/** + * tm_cvmx_get - get CMVX registers + * @target: The target task. + * @regset: The user regset structure. + * @to: Destination of copy. + * + * This function gets in transaction checkpointed VMX registers. + * + * When the transaction is active 'ckvr_state' and 'ckvrsave' hold + * the checkpointed values for the current transaction to fall + * back on if it aborts in between. The userspace interface buffer + * layout is as follows. + * + * struct data { + * vector128 vr[32]; + * vector128 vscr; + * vector128 vrsave; + *}; + */ +int tm_cvmx_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + union { + elf_vrreg_t reg; + u32 word; + } vrsave; + BUILD_BUG_ON(TVSO(vscr) != TVSO(vr[32])); + + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (!MSR_TM_ACTIVE(target->thread.regs->msr)) + return -ENODATA; + + /* Flush the state */ + flush_tmregs_to_thread(target); + flush_fp_to_thread(target); + flush_altivec_to_thread(target); + + membuf_write(&to, &target->thread.ckvr_state, 33 * sizeof(vector128)); + /* + * Copy out only the low-order word of vrsave. + */ + memset(&vrsave, 0, sizeof(vrsave)); + vrsave.word = target->thread.ckvrsave; + return membuf_write(&to, &vrsave, sizeof(vrsave)); +} + +/** + * tm_cvmx_set - set CMVX registers + * @target: The target task. + * @regset: The user regset structure. + * @pos: The buffer position. + * @count: Number of bytes to copy. + * @kbuf: Kernel buffer to copy into. + * @ubuf: User buffer to copy from. + * + * This function sets in transaction checkpointed VMX registers. + * + * When the transaction is active 'ckvr_state' and 'ckvrsave' hold + * the checkpointed values for the current transaction to fall + * back on if it aborts in between. The userspace interface buffer + * layout is as follows. + * + * struct data { + * vector128 vr[32]; + * vector128 vscr; + * vector128 vrsave; + *}; + */ +int tm_cvmx_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + int ret; + + BUILD_BUG_ON(TVSO(vscr) != TVSO(vr[32])); + + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (!MSR_TM_ACTIVE(target->thread.regs->msr)) + return -ENODATA; + + flush_tmregs_to_thread(target); + flush_fp_to_thread(target); + flush_altivec_to_thread(target); + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.ckvr_state, + 0, 33 * sizeof(vector128)); + if (!ret && count > 0) { + /* + * We use only the low-order word of vrsave. + */ + union { + elf_vrreg_t reg; + u32 word; + } vrsave; + memset(&vrsave, 0, sizeof(vrsave)); + vrsave.word = target->thread.ckvrsave; + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &vrsave, + 33 * sizeof(vector128), -1); + if (!ret) + target->thread.ckvrsave = vrsave.word; + } + + return ret; +} + +/** + * tm_cvsx_active - get active number of registers in CVSX + * @target: The target task. + * @regset: The user regset structure. + * + * This function checks for the active number of available + * regisers in transaction checkpointed VSX category. + */ +int tm_cvsx_active(struct task_struct *target, const struct user_regset *regset) +{ + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (!MSR_TM_ACTIVE(target->thread.regs->msr)) + return 0; + + flush_vsx_to_thread(target); + return target->thread.used_vsr ? regset->n : 0; +} + +/** + * tm_cvsx_get - get CVSX registers + * @target: The target task. + * @regset: The user regset structure. + * @to: Destination of copy. + * + * This function gets in transaction checkpointed VSX registers. + * + * When the transaction is active 'ckfp_state' holds the checkpointed + * values for the current transaction to fall back on if it aborts + * in between. This function gets those checkpointed VSX registers. + * The userspace interface buffer layout is as follows. + * + * struct data { + * u64 vsx[32]; + *}; + */ +int tm_cvsx_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + u64 buf[32]; + int i; + + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (!MSR_TM_ACTIVE(target->thread.regs->msr)) + return -ENODATA; + + /* Flush the state */ + flush_tmregs_to_thread(target); + flush_fp_to_thread(target); + flush_altivec_to_thread(target); + flush_vsx_to_thread(target); + + for (i = 0; i < 32 ; i++) + buf[i] = target->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET]; + return membuf_write(&to, buf, 32 * sizeof(double)); +} + +/** + * tm_cvsx_set - set CFPR registers + * @target: The target task. + * @regset: The user regset structure. + * @pos: The buffer position. + * @count: Number of bytes to copy. + * @kbuf: Kernel buffer to copy into. + * @ubuf: User buffer to copy from. + * + * This function sets in transaction checkpointed VSX registers. + * + * When the transaction is active 'ckfp_state' holds the checkpointed + * VSX register values for the current transaction to fall back on + * if it aborts in between. This function sets these checkpointed + * FPR registers. The userspace interface buffer layout is as follows. + * + * struct data { + * u64 vsx[32]; + *}; + */ +int tm_cvsx_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + u64 buf[32]; + int ret, i; + + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (!MSR_TM_ACTIVE(target->thread.regs->msr)) + return -ENODATA; + + /* Flush the state */ + flush_tmregs_to_thread(target); + flush_fp_to_thread(target); + flush_altivec_to_thread(target); + flush_vsx_to_thread(target); + + for (i = 0; i < 32 ; i++) + buf[i] = target->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET]; + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + buf, 0, 32 * sizeof(double)); + if (!ret) + for (i = 0; i < 32 ; i++) + target->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i]; + + return ret; +} + +/** + * tm_spr_active - get active number of registers in TM SPR + * @target: The target task. + * @regset: The user regset structure. + * + * This function checks the active number of available + * regisers in the transactional memory SPR category. + */ +int tm_spr_active(struct task_struct *target, const struct user_regset *regset) +{ + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + return regset->n; +} + +/** + * tm_spr_get - get the TM related SPR registers + * @target: The target task. + * @regset: The user regset structure. + * @to: Destination of copy. + * + * This function gets transactional memory related SPR registers. + * The userspace interface buffer layout is as follows. + * + * struct { + * u64 tm_tfhar; + * u64 tm_texasr; + * u64 tm_tfiar; + * }; + */ +int tm_spr_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + /* Build tests */ + BUILD_BUG_ON(TSO(tm_tfhar) + sizeof(u64) != TSO(tm_texasr)); + BUILD_BUG_ON(TSO(tm_texasr) + sizeof(u64) != TSO(tm_tfiar)); + BUILD_BUG_ON(TSO(tm_tfiar) + sizeof(u64) != TSO(ckpt_regs)); + + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + /* Flush the states */ + flush_tmregs_to_thread(target); + flush_fp_to_thread(target); + flush_altivec_to_thread(target); + + /* TFHAR register */ + membuf_write(&to, &target->thread.tm_tfhar, sizeof(u64)); + /* TEXASR register */ + membuf_write(&to, &target->thread.tm_texasr, sizeof(u64)); + /* TFIAR register */ + return membuf_write(&to, &target->thread.tm_tfiar, sizeof(u64)); +} + +/** + * tm_spr_set - set the TM related SPR registers + * @target: The target task. + * @regset: The user regset structure. + * @pos: The buffer position. + * @count: Number of bytes to copy. + * @kbuf: Kernel buffer to copy into. + * @ubuf: User buffer to copy from. + * + * This function sets transactional memory related SPR registers. + * The userspace interface buffer layout is as follows. + * + * struct { + * u64 tm_tfhar; + * u64 tm_texasr; + * u64 tm_tfiar; + * }; + */ +int tm_spr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + int ret; + + /* Build tests */ + BUILD_BUG_ON(TSO(tm_tfhar) + sizeof(u64) != TSO(tm_texasr)); + BUILD_BUG_ON(TSO(tm_texasr) + sizeof(u64) != TSO(tm_tfiar)); + BUILD_BUG_ON(TSO(tm_tfiar) + sizeof(u64) != TSO(ckpt_regs)); + + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + /* Flush the states */ + flush_tmregs_to_thread(target); + flush_fp_to_thread(target); + flush_altivec_to_thread(target); + + /* TFHAR register */ + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.tm_tfhar, 0, sizeof(u64)); + + /* TEXASR register */ + if (!ret) + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.tm_texasr, sizeof(u64), + 2 * sizeof(u64)); + + /* TFIAR register */ + if (!ret) + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.tm_tfiar, + 2 * sizeof(u64), 3 * sizeof(u64)); + return ret; +} + +int tm_tar_active(struct task_struct *target, const struct user_regset *regset) +{ + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (MSR_TM_ACTIVE(target->thread.regs->msr)) + return regset->n; + + return 0; +} + +int tm_tar_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (!MSR_TM_ACTIVE(target->thread.regs->msr)) + return -ENODATA; + + return membuf_write(&to, &target->thread.tm_tar, sizeof(u64)); +} + +int tm_tar_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + int ret; + + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (!MSR_TM_ACTIVE(target->thread.regs->msr)) + return -ENODATA; + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.tm_tar, 0, sizeof(u64)); + return ret; +} + +int tm_ppr_active(struct task_struct *target, const struct user_regset *regset) +{ + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (MSR_TM_ACTIVE(target->thread.regs->msr)) + return regset->n; + + return 0; +} + + +int tm_ppr_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (!MSR_TM_ACTIVE(target->thread.regs->msr)) + return -ENODATA; + + return membuf_write(&to, &target->thread.tm_ppr, sizeof(u64)); +} + +int tm_ppr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + int ret; + + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (!MSR_TM_ACTIVE(target->thread.regs->msr)) + return -ENODATA; + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.tm_ppr, 0, sizeof(u64)); + return ret; +} + +int tm_dscr_active(struct task_struct *target, const struct user_regset *regset) +{ + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (MSR_TM_ACTIVE(target->thread.regs->msr)) + return regset->n; + + return 0; +} + +int tm_dscr_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (!MSR_TM_ACTIVE(target->thread.regs->msr)) + return -ENODATA; + + return membuf_write(&to, &target->thread.tm_dscr, sizeof(u64)); +} + +int tm_dscr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + int ret; + + if (!cpu_has_feature(CPU_FTR_TM)) + return -ENODEV; + + if (!MSR_TM_ACTIVE(target->thread.regs->msr)) + return -ENODATA; + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.tm_dscr, 0, sizeof(u64)); + return ret; +} + +int tm_cgpr32_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + gpr32_get_common(target, regset, to, + &target->thread.ckpt_regs.gpr[0]); + return membuf_zero(&to, ELF_NGREG * sizeof(u32)); +} + +int tm_cgpr32_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + return gpr32_set_common(target, regset, pos, count, kbuf, ubuf, + &target->thread.ckpt_regs.gpr[0]); +} diff --git a/arch/powerpc/kernel/ptrace/ptrace-view.c b/arch/powerpc/kernel/ptrace/ptrace-view.c new file mode 100644 index 000000000..31876db8e --- /dev/null +++ b/arch/powerpc/kernel/ptrace/ptrace-view.c @@ -0,0 +1,853 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <linux/regset.h> +#include <linux/elf.h> +#include <linux/nospec.h> +#include <linux/pkeys.h> + +#include "ptrace-decl.h" + +struct pt_regs_offset { + const char *name; + int offset; +}; + +#define STR(s) #s /* convert to string */ +#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} +#define GPR_OFFSET_NAME(num) \ + {.name = STR(r##num), .offset = offsetof(struct pt_regs, gpr[num])}, \ + {.name = STR(gpr##num), .offset = offsetof(struct pt_regs, gpr[num])} +#define REG_OFFSET_END {.name = NULL, .offset = 0} + +static const struct pt_regs_offset regoffset_table[] = { + GPR_OFFSET_NAME(0), + GPR_OFFSET_NAME(1), + GPR_OFFSET_NAME(2), + GPR_OFFSET_NAME(3), + GPR_OFFSET_NAME(4), + GPR_OFFSET_NAME(5), + GPR_OFFSET_NAME(6), + GPR_OFFSET_NAME(7), + GPR_OFFSET_NAME(8), + GPR_OFFSET_NAME(9), + GPR_OFFSET_NAME(10), + GPR_OFFSET_NAME(11), + GPR_OFFSET_NAME(12), + GPR_OFFSET_NAME(13), + GPR_OFFSET_NAME(14), + GPR_OFFSET_NAME(15), + GPR_OFFSET_NAME(16), + GPR_OFFSET_NAME(17), + GPR_OFFSET_NAME(18), + GPR_OFFSET_NAME(19), + GPR_OFFSET_NAME(20), + GPR_OFFSET_NAME(21), + GPR_OFFSET_NAME(22), + GPR_OFFSET_NAME(23), + GPR_OFFSET_NAME(24), + GPR_OFFSET_NAME(25), + GPR_OFFSET_NAME(26), + GPR_OFFSET_NAME(27), + GPR_OFFSET_NAME(28), + GPR_OFFSET_NAME(29), + GPR_OFFSET_NAME(30), + GPR_OFFSET_NAME(31), + REG_OFFSET_NAME(nip), + REG_OFFSET_NAME(msr), + REG_OFFSET_NAME(ctr), + REG_OFFSET_NAME(link), + REG_OFFSET_NAME(xer), + REG_OFFSET_NAME(ccr), +#ifdef CONFIG_PPC64 + REG_OFFSET_NAME(softe), +#else + REG_OFFSET_NAME(mq), +#endif + REG_OFFSET_NAME(trap), + REG_OFFSET_NAME(dar), + REG_OFFSET_NAME(dsisr), + REG_OFFSET_END, +}; + +/** + * regs_query_register_offset() - query register offset from its name + * @name: the name of a register + * + * regs_query_register_offset() returns the offset of a register in struct + * pt_regs from its name. If the name is invalid, this returns -EINVAL; + */ +int regs_query_register_offset(const char *name) +{ + const struct pt_regs_offset *roff; + for (roff = regoffset_table; roff->name != NULL; roff++) + if (!strcmp(roff->name, name)) + return roff->offset; + return -EINVAL; +} + +/** + * regs_query_register_name() - query register name from its offset + * @offset: the offset of a register in struct pt_regs. + * + * regs_query_register_name() returns the name of a register from its + * offset in struct pt_regs. If the @offset is invalid, this returns NULL; + */ +const char *regs_query_register_name(unsigned int offset) +{ + const struct pt_regs_offset *roff; + for (roff = regoffset_table; roff->name != NULL; roff++) + if (roff->offset == offset) + return roff->name; + return NULL; +} + +/* + * does not yet catch signals sent when the child dies. + * in exit.c or in signal.c. + */ + +static unsigned long get_user_msr(struct task_struct *task) +{ + return task->thread.regs->msr | task->thread.fpexc_mode; +} + +static __always_inline int set_user_msr(struct task_struct *task, unsigned long msr) +{ + unsigned long newmsr = (task->thread.regs->msr & ~MSR_DEBUGCHANGE) | + (msr & MSR_DEBUGCHANGE); + regs_set_return_msr(task->thread.regs, newmsr); + return 0; +} + +#ifdef CONFIG_PPC64 +static int get_user_dscr(struct task_struct *task, unsigned long *data) +{ + *data = task->thread.dscr; + return 0; +} + +static int set_user_dscr(struct task_struct *task, unsigned long dscr) +{ + task->thread.dscr = dscr; + task->thread.dscr_inherit = 1; + return 0; +} +#else +static int get_user_dscr(struct task_struct *task, unsigned long *data) +{ + return -EIO; +} + +static int set_user_dscr(struct task_struct *task, unsigned long dscr) +{ + return -EIO; +} +#endif + +/* + * We prevent mucking around with the reserved area of trap + * which are used internally by the kernel. + */ +static __always_inline int set_user_trap(struct task_struct *task, unsigned long trap) +{ + set_trap(task->thread.regs, trap); + return 0; +} + +/* + * Get contents of register REGNO in task TASK. + */ +int ptrace_get_reg(struct task_struct *task, int regno, unsigned long *data) +{ + unsigned int regs_max; + + if (task->thread.regs == NULL || !data) + return -EIO; + + if (regno == PT_MSR) { + *data = get_user_msr(task); + return 0; + } + + if (regno == PT_DSCR) + return get_user_dscr(task, data); + + /* + * softe copies paca->irq_soft_mask variable state. Since irq_soft_mask is + * no more used as a flag, lets force usr to always see the softe value as 1 + * which means interrupts are not soft disabled. + */ + if (IS_ENABLED(CONFIG_PPC64) && regno == PT_SOFTE) { + *data = 1; + return 0; + } + + regs_max = sizeof(struct user_pt_regs) / sizeof(unsigned long); + if (regno < regs_max) { + regno = array_index_nospec(regno, regs_max); + *data = ((unsigned long *)task->thread.regs)[regno]; + return 0; + } + + return -EIO; +} + +/* + * Write contents of register REGNO in task TASK. + */ +int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data) +{ + if (task->thread.regs == NULL) + return -EIO; + + if (regno == PT_MSR) + return set_user_msr(task, data); + if (regno == PT_TRAP) + return set_user_trap(task, data); + if (regno == PT_DSCR) + return set_user_dscr(task, data); + + if (regno <= PT_MAX_PUT_REG) { + regno = array_index_nospec(regno, PT_MAX_PUT_REG + 1); + ((unsigned long *)task->thread.regs)[regno] = data; + return 0; + } + return -EIO; +} + +static int gpr_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + struct membuf to_msr = membuf_at(&to, offsetof(struct pt_regs, msr)); +#ifdef CONFIG_PPC64 + struct membuf to_softe = membuf_at(&to, offsetof(struct pt_regs, softe)); +#endif + if (target->thread.regs == NULL) + return -EIO; + + membuf_write(&to, target->thread.regs, sizeof(struct user_pt_regs)); + + membuf_store(&to_msr, get_user_msr(target)); +#ifdef CONFIG_PPC64 + membuf_store(&to_softe, 0x1ul); +#endif + return membuf_zero(&to, ELF_NGREG * sizeof(unsigned long) - + sizeof(struct user_pt_regs)); +} + +static int gpr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, const void *kbuf, + const void __user *ubuf) +{ + unsigned long reg; + int ret; + + if (target->thread.regs == NULL) + return -EIO; + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + target->thread.regs, + 0, PT_MSR * sizeof(reg)); + + if (!ret && count > 0) { + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®, + PT_MSR * sizeof(reg), + (PT_MSR + 1) * sizeof(reg)); + if (!ret) + ret = set_user_msr(target, reg); + } + + BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) != + offsetof(struct pt_regs, msr) + sizeof(long)); + + if (!ret) + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.regs->orig_gpr3, + PT_ORIG_R3 * sizeof(reg), + (PT_MAX_PUT_REG + 1) * sizeof(reg)); + + if (PT_MAX_PUT_REG + 1 < PT_TRAP && !ret) + ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, + (PT_MAX_PUT_REG + 1) * sizeof(reg), + PT_TRAP * sizeof(reg)); + + if (!ret && count > 0) { + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®, + PT_TRAP * sizeof(reg), + (PT_TRAP + 1) * sizeof(reg)); + if (!ret) + ret = set_user_trap(target, reg); + } + + if (!ret) + ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, + (PT_TRAP + 1) * sizeof(reg), -1); + + return ret; +} + +#ifdef CONFIG_PPC64 +static int ppr_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + if (!target->thread.regs) + return -EINVAL; + + return membuf_write(&to, &target->thread.regs->ppr, sizeof(u64)); +} + +static int ppr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, const void *kbuf, + const void __user *ubuf) +{ + if (!target->thread.regs) + return -EINVAL; + + return user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.regs->ppr, 0, sizeof(u64)); +} + +static int dscr_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + return membuf_write(&to, &target->thread.dscr, sizeof(u64)); +} +static int dscr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, const void *kbuf, + const void __user *ubuf) +{ + return user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.dscr, 0, sizeof(u64)); +} +#endif +#ifdef CONFIG_PPC_BOOK3S_64 +static int tar_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + return membuf_write(&to, &target->thread.tar, sizeof(u64)); +} +static int tar_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, const void *kbuf, + const void __user *ubuf) +{ + return user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.tar, 0, sizeof(u64)); +} + +static int ebb_active(struct task_struct *target, const struct user_regset *regset) +{ + if (!cpu_has_feature(CPU_FTR_ARCH_207S)) + return -ENODEV; + + if (target->thread.used_ebb) + return regset->n; + + return 0; +} + +static int ebb_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + /* Build tests */ + BUILD_BUG_ON(TSO(ebbrr) + sizeof(unsigned long) != TSO(ebbhr)); + BUILD_BUG_ON(TSO(ebbhr) + sizeof(unsigned long) != TSO(bescr)); + + if (!cpu_has_feature(CPU_FTR_ARCH_207S)) + return -ENODEV; + + if (!target->thread.used_ebb) + return -ENODATA; + + return membuf_write(&to, &target->thread.ebbrr, 3 * sizeof(unsigned long)); +} + +static int ebb_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, const void *kbuf, + const void __user *ubuf) +{ + int ret = 0; + + /* Build tests */ + BUILD_BUG_ON(TSO(ebbrr) + sizeof(unsigned long) != TSO(ebbhr)); + BUILD_BUG_ON(TSO(ebbhr) + sizeof(unsigned long) != TSO(bescr)); + + if (!cpu_has_feature(CPU_FTR_ARCH_207S)) + return -ENODEV; + + if (target->thread.used_ebb) + return -ENODATA; + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.ebbrr, + 0, sizeof(unsigned long)); + + if (!ret) + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.ebbhr, sizeof(unsigned long), + 2 * sizeof(unsigned long)); + + if (!ret) + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.bescr, 2 * sizeof(unsigned long), + 3 * sizeof(unsigned long)); + + return ret; +} +static int pmu_active(struct task_struct *target, const struct user_regset *regset) +{ + if (!cpu_has_feature(CPU_FTR_ARCH_207S)) + return -ENODEV; + + return regset->n; +} + +static int pmu_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + /* Build tests */ + BUILD_BUG_ON(TSO(siar) + sizeof(unsigned long) != TSO(sdar)); + BUILD_BUG_ON(TSO(sdar) + sizeof(unsigned long) != TSO(sier)); + BUILD_BUG_ON(TSO(sier) + sizeof(unsigned long) != TSO(mmcr2)); + BUILD_BUG_ON(TSO(mmcr2) + sizeof(unsigned long) != TSO(mmcr0)); + + if (!cpu_has_feature(CPU_FTR_ARCH_207S)) + return -ENODEV; + + return membuf_write(&to, &target->thread.siar, 5 * sizeof(unsigned long)); +} + +static int pmu_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, const void *kbuf, + const void __user *ubuf) +{ + int ret = 0; + + /* Build tests */ + BUILD_BUG_ON(TSO(siar) + sizeof(unsigned long) != TSO(sdar)); + BUILD_BUG_ON(TSO(sdar) + sizeof(unsigned long) != TSO(sier)); + BUILD_BUG_ON(TSO(sier) + sizeof(unsigned long) != TSO(mmcr2)); + BUILD_BUG_ON(TSO(mmcr2) + sizeof(unsigned long) != TSO(mmcr0)); + + if (!cpu_has_feature(CPU_FTR_ARCH_207S)) + return -ENODEV; + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.siar, + 0, sizeof(unsigned long)); + + if (!ret) + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.sdar, sizeof(unsigned long), + 2 * sizeof(unsigned long)); + + if (!ret) + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.sier, 2 * sizeof(unsigned long), + 3 * sizeof(unsigned long)); + + if (!ret) + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.mmcr2, 3 * sizeof(unsigned long), + 4 * sizeof(unsigned long)); + + if (!ret) + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.mmcr0, 4 * sizeof(unsigned long), + 5 * sizeof(unsigned long)); + return ret; +} +#endif + +#ifdef CONFIG_PPC_MEM_KEYS +static int pkey_active(struct task_struct *target, const struct user_regset *regset) +{ + if (!arch_pkeys_enabled()) + return -ENODEV; + + return regset->n; +} + +static int pkey_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + + if (!arch_pkeys_enabled()) + return -ENODEV; + + membuf_store(&to, target->thread.regs->amr); + membuf_store(&to, target->thread.regs->iamr); + return membuf_store(&to, default_uamor); +} + +static int pkey_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, const void *kbuf, + const void __user *ubuf) +{ + u64 new_amr; + int ret; + + if (!arch_pkeys_enabled()) + return -ENODEV; + + /* Only the AMR can be set from userspace */ + if (pos != 0 || count != sizeof(new_amr)) + return -EINVAL; + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &new_amr, 0, sizeof(new_amr)); + if (ret) + return ret; + + /* + * UAMOR determines which bits of the AMR can be set from userspace. + * UAMOR value 0b11 indicates that the AMR value can be modified + * from userspace. If the kernel is using a specific key, we avoid + * userspace modifying the AMR value for that key by masking them + * via UAMOR 0b00. + * + * Pick the AMR values for the keys that kernel is using. This + * will be indicated by the ~default_uamor bits. + */ + target->thread.regs->amr = (new_amr & default_uamor) | + (target->thread.regs->amr & ~default_uamor); + + return 0; +} +#endif /* CONFIG_PPC_MEM_KEYS */ + +static const struct user_regset native_regsets[] = { + [REGSET_GPR] = { + .core_note_type = NT_PRSTATUS, .n = ELF_NGREG, + .size = sizeof(long), .align = sizeof(long), + .regset_get = gpr_get, .set = gpr_set + }, + [REGSET_FPR] = { + .core_note_type = NT_PRFPREG, .n = ELF_NFPREG, + .size = sizeof(double), .align = sizeof(double), + .regset_get = fpr_get, .set = fpr_set + }, +#ifdef CONFIG_ALTIVEC + [REGSET_VMX] = { + .core_note_type = NT_PPC_VMX, .n = 34, + .size = sizeof(vector128), .align = sizeof(vector128), + .active = vr_active, .regset_get = vr_get, .set = vr_set + }, +#endif +#ifdef CONFIG_VSX + [REGSET_VSX] = { + .core_note_type = NT_PPC_VSX, .n = 32, + .size = sizeof(double), .align = sizeof(double), + .active = vsr_active, .regset_get = vsr_get, .set = vsr_set + }, +#endif +#ifdef CONFIG_SPE + [REGSET_SPE] = { + .core_note_type = NT_PPC_SPE, .n = 35, + .size = sizeof(u32), .align = sizeof(u32), + .active = evr_active, .regset_get = evr_get, .set = evr_set + }, +#endif +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + [REGSET_TM_CGPR] = { + .core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG, + .size = sizeof(long), .align = sizeof(long), + .active = tm_cgpr_active, .regset_get = tm_cgpr_get, .set = tm_cgpr_set + }, + [REGSET_TM_CFPR] = { + .core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG, + .size = sizeof(double), .align = sizeof(double), + .active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set + }, + [REGSET_TM_CVMX] = { + .core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX, + .size = sizeof(vector128), .align = sizeof(vector128), + .active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set + }, + [REGSET_TM_CVSX] = { + .core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX, + .size = sizeof(double), .align = sizeof(double), + .active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set + }, + [REGSET_TM_SPR] = { + .core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG, + .size = sizeof(u64), .align = sizeof(u64), + .active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set + }, + [REGSET_TM_CTAR] = { + .core_note_type = NT_PPC_TM_CTAR, .n = 1, + .size = sizeof(u64), .align = sizeof(u64), + .active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set + }, + [REGSET_TM_CPPR] = { + .core_note_type = NT_PPC_TM_CPPR, .n = 1, + .size = sizeof(u64), .align = sizeof(u64), + .active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set + }, + [REGSET_TM_CDSCR] = { + .core_note_type = NT_PPC_TM_CDSCR, .n = 1, + .size = sizeof(u64), .align = sizeof(u64), + .active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set + }, +#endif +#ifdef CONFIG_PPC64 + [REGSET_PPR] = { + .core_note_type = NT_PPC_PPR, .n = 1, + .size = sizeof(u64), .align = sizeof(u64), + .regset_get = ppr_get, .set = ppr_set + }, + [REGSET_DSCR] = { + .core_note_type = NT_PPC_DSCR, .n = 1, + .size = sizeof(u64), .align = sizeof(u64), + .regset_get = dscr_get, .set = dscr_set + }, +#endif +#ifdef CONFIG_PPC_BOOK3S_64 + [REGSET_TAR] = { + .core_note_type = NT_PPC_TAR, .n = 1, + .size = sizeof(u64), .align = sizeof(u64), + .regset_get = tar_get, .set = tar_set + }, + [REGSET_EBB] = { + .core_note_type = NT_PPC_EBB, .n = ELF_NEBB, + .size = sizeof(u64), .align = sizeof(u64), + .active = ebb_active, .regset_get = ebb_get, .set = ebb_set + }, + [REGSET_PMR] = { + .core_note_type = NT_PPC_PMU, .n = ELF_NPMU, + .size = sizeof(u64), .align = sizeof(u64), + .active = pmu_active, .regset_get = pmu_get, .set = pmu_set + }, +#endif +#ifdef CONFIG_PPC_MEM_KEYS + [REGSET_PKEY] = { + .core_note_type = NT_PPC_PKEY, .n = ELF_NPKEY, + .size = sizeof(u64), .align = sizeof(u64), + .active = pkey_active, .regset_get = pkey_get, .set = pkey_set + }, +#endif +}; + +const struct user_regset_view user_ppc_native_view = { + .name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI, + .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets) +}; + +#include <linux/compat.h> + +int gpr32_get_common(struct task_struct *target, + const struct user_regset *regset, + struct membuf to, unsigned long *regs) +{ + int i; + + for (i = 0; i < PT_MSR; i++) + membuf_store(&to, (u32)regs[i]); + membuf_store(&to, (u32)get_user_msr(target)); + for (i++ ; i < PT_REGS_COUNT; i++) + membuf_store(&to, (u32)regs[i]); + return membuf_zero(&to, (ELF_NGREG - PT_REGS_COUNT) * sizeof(u32)); +} + +int gpr32_set_common(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf, + unsigned long *regs) +{ + const compat_ulong_t *k = kbuf; + const compat_ulong_t __user *u = ubuf; + compat_ulong_t reg; + + if (!kbuf && !user_read_access_begin(u, count)) + return -EFAULT; + + pos /= sizeof(reg); + count /= sizeof(reg); + + if (kbuf) + for (; count > 0 && pos < PT_MSR; --count) + regs[pos++] = *k++; + else + for (; count > 0 && pos < PT_MSR; --count) { + unsafe_get_user(reg, u++, Efault); + regs[pos++] = reg; + } + + + if (count > 0 && pos == PT_MSR) { + if (kbuf) + reg = *k++; + else + unsafe_get_user(reg, u++, Efault); + set_user_msr(target, reg); + ++pos; + --count; + } + + if (kbuf) { + for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) + regs[pos++] = *k++; + for (; count > 0 && pos < PT_TRAP; --count, ++pos) + ++k; + } else { + for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) { + unsafe_get_user(reg, u++, Efault); + regs[pos++] = reg; + } + for (; count > 0 && pos < PT_TRAP; --count, ++pos) + unsafe_get_user(reg, u++, Efault); + } + + if (count > 0 && pos == PT_TRAP) { + if (kbuf) + reg = *k++; + else + unsafe_get_user(reg, u++, Efault); + set_user_trap(target, reg); + ++pos; + --count; + } + if (!kbuf) + user_read_access_end(); + + kbuf = k; + ubuf = u; + pos *= sizeof(reg); + count *= sizeof(reg); + return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, + (PT_TRAP + 1) * sizeof(reg), -1); + +Efault: + user_read_access_end(); + return -EFAULT; +} + +static int gpr32_get(struct task_struct *target, + const struct user_regset *regset, + struct membuf to) +{ + if (target->thread.regs == NULL) + return -EIO; + + return gpr32_get_common(target, regset, to, + &target->thread.regs->gpr[0]); +} + +static int gpr32_set(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + if (target->thread.regs == NULL) + return -EIO; + + return gpr32_set_common(target, regset, pos, count, kbuf, ubuf, + &target->thread.regs->gpr[0]); +} + +/* + * These are the regset flavors matching the CONFIG_PPC32 native set. + */ +static const struct user_regset compat_regsets[] = { + [REGSET_GPR] = { + .core_note_type = NT_PRSTATUS, .n = ELF_NGREG, + .size = sizeof(compat_long_t), .align = sizeof(compat_long_t), + .regset_get = gpr32_get, .set = gpr32_set + }, + [REGSET_FPR] = { + .core_note_type = NT_PRFPREG, .n = ELF_NFPREG, + .size = sizeof(double), .align = sizeof(double), + .regset_get = fpr_get, .set = fpr_set + }, +#ifdef CONFIG_ALTIVEC + [REGSET_VMX] = { + .core_note_type = NT_PPC_VMX, .n = 34, + .size = sizeof(vector128), .align = sizeof(vector128), + .active = vr_active, .regset_get = vr_get, .set = vr_set + }, +#endif +#ifdef CONFIG_SPE + [REGSET_SPE] = { + .core_note_type = NT_PPC_SPE, .n = 35, + .size = sizeof(u32), .align = sizeof(u32), + .active = evr_active, .regset_get = evr_get, .set = evr_set + }, +#endif +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + [REGSET_TM_CGPR] = { + .core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG, + .size = sizeof(long), .align = sizeof(long), + .active = tm_cgpr_active, + .regset_get = tm_cgpr32_get, .set = tm_cgpr32_set + }, + [REGSET_TM_CFPR] = { + .core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG, + .size = sizeof(double), .align = sizeof(double), + .active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set + }, + [REGSET_TM_CVMX] = { + .core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX, + .size = sizeof(vector128), .align = sizeof(vector128), + .active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set + }, + [REGSET_TM_CVSX] = { + .core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX, + .size = sizeof(double), .align = sizeof(double), + .active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set + }, + [REGSET_TM_SPR] = { + .core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG, + .size = sizeof(u64), .align = sizeof(u64), + .active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set + }, + [REGSET_TM_CTAR] = { + .core_note_type = NT_PPC_TM_CTAR, .n = 1, + .size = sizeof(u64), .align = sizeof(u64), + .active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set + }, + [REGSET_TM_CPPR] = { + .core_note_type = NT_PPC_TM_CPPR, .n = 1, + .size = sizeof(u64), .align = sizeof(u64), + .active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set + }, + [REGSET_TM_CDSCR] = { + .core_note_type = NT_PPC_TM_CDSCR, .n = 1, + .size = sizeof(u64), .align = sizeof(u64), + .active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set + }, +#endif +#ifdef CONFIG_PPC64 + [REGSET_PPR] = { + .core_note_type = NT_PPC_PPR, .n = 1, + .size = sizeof(u64), .align = sizeof(u64), + .regset_get = ppr_get, .set = ppr_set + }, + [REGSET_DSCR] = { + .core_note_type = NT_PPC_DSCR, .n = 1, + .size = sizeof(u64), .align = sizeof(u64), + .regset_get = dscr_get, .set = dscr_set + }, +#endif +#ifdef CONFIG_PPC_BOOK3S_64 + [REGSET_TAR] = { + .core_note_type = NT_PPC_TAR, .n = 1, + .size = sizeof(u64), .align = sizeof(u64), + .regset_get = tar_get, .set = tar_set + }, + [REGSET_EBB] = { + .core_note_type = NT_PPC_EBB, .n = ELF_NEBB, + .size = sizeof(u64), .align = sizeof(u64), + .active = ebb_active, .regset_get = ebb_get, .set = ebb_set + }, +#endif +}; + +static const struct user_regset_view user_ppc_compat_view = { + .name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI, + .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets) +}; + +const struct user_regset_view *task_user_regset_view(struct task_struct *task) +{ + if (IS_ENABLED(CONFIG_COMPAT) && is_tsk_32bit_task(task)) + return &user_ppc_compat_view; + return &user_ppc_native_view; +} diff --git a/arch/powerpc/kernel/ptrace/ptrace-vsx.c b/arch/powerpc/kernel/ptrace/ptrace-vsx.c new file mode 100644 index 000000000..7df08004c --- /dev/null +++ b/arch/powerpc/kernel/ptrace/ptrace-vsx.c @@ -0,0 +1,148 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <linux/regset.h> + +#include <asm/switch_to.h> + +#include "ptrace-decl.h" + +/* + * Regardless of transactions, 'fp_state' holds the current running + * value of all FPR registers and 'ckfp_state' holds the last checkpointed + * value of all FPR registers for the current transaction. + * + * Userspace interface buffer layout: + * + * struct data { + * u64 fpr[32]; + * u64 fpscr; + * }; + */ +int fpr_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + u64 buf[33]; + int i; + + flush_fp_to_thread(target); + + /* copy to local buffer then write that out */ + for (i = 0; i < 32 ; i++) + buf[i] = target->thread.TS_FPR(i); + buf[32] = target->thread.fp_state.fpscr; + return membuf_write(&to, buf, 33 * sizeof(u64)); +} + +/* + * Regardless of transactions, 'fp_state' holds the current running + * value of all FPR registers and 'ckfp_state' holds the last checkpointed + * value of all FPR registers for the current transaction. + * + * Userspace interface buffer layout: + * + * struct data { + * u64 fpr[32]; + * u64 fpscr; + * }; + * + */ +int fpr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + u64 buf[33]; + int i; + + flush_fp_to_thread(target); + + for (i = 0; i < 32 ; i++) + buf[i] = target->thread.TS_FPR(i); + buf[32] = target->thread.fp_state.fpscr; + + /* copy to local buffer then write that out */ + i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1); + if (i) + return i; + + for (i = 0; i < 32 ; i++) + target->thread.TS_FPR(i) = buf[i]; + target->thread.fp_state.fpscr = buf[32]; + return 0; +} + +/* + * Currently to set and get all the vsx state, you need to call + * the fp and VMX calls as well. This only get/sets the lower 32 + * 128bit VSX registers. + */ + +int vsr_active(struct task_struct *target, const struct user_regset *regset) +{ + flush_vsx_to_thread(target); + return target->thread.used_vsr ? regset->n : 0; +} + +/* + * Regardless of transactions, 'fp_state' holds the current running + * value of all FPR registers and 'ckfp_state' holds the last + * checkpointed value of all FPR registers for the current + * transaction. + * + * Userspace interface buffer layout: + * + * struct data { + * u64 vsx[32]; + * }; + */ +int vsr_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ + u64 buf[32]; + int i; + + flush_tmregs_to_thread(target); + flush_fp_to_thread(target); + flush_altivec_to_thread(target); + flush_vsx_to_thread(target); + + for (i = 0; i < 32 ; i++) + buf[i] = target->thread.fp_state.fpr[i][TS_VSRLOWOFFSET]; + + return membuf_write(&to, buf, 32 * sizeof(double)); +} + +/* + * Regardless of transactions, 'fp_state' holds the current running + * value of all FPR registers and 'ckfp_state' holds the last + * checkpointed value of all FPR registers for the current + * transaction. + * + * Userspace interface buffer layout: + * + * struct data { + * u64 vsx[32]; + * }; + */ +int vsr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + u64 buf[32]; + int ret, i; + + flush_tmregs_to_thread(target); + flush_fp_to_thread(target); + flush_altivec_to_thread(target); + flush_vsx_to_thread(target); + + for (i = 0; i < 32 ; i++) + buf[i] = target->thread.fp_state.fpr[i][TS_VSRLOWOFFSET]; + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + buf, 0, 32 * sizeof(double)); + if (!ret) + for (i = 0; i < 32 ; i++) + target->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i]; + + return ret; +} diff --git a/arch/powerpc/kernel/ptrace/ptrace.c b/arch/powerpc/kernel/ptrace/ptrace.c new file mode 100644 index 000000000..5d7a72b41 --- /dev/null +++ b/arch/powerpc/kernel/ptrace/ptrace.c @@ -0,0 +1,450 @@ +/* + * PowerPC version + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * + * Derived from "arch/m68k/kernel/ptrace.c" + * Copyright (C) 1994 by Hamish Macdonald + * Taken from linux/kernel/ptrace.c and modified for M680x0. + * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds + * + * Modified by Cort Dougan (cort@hq.fsmlabs.com) + * and Paul Mackerras (paulus@samba.org). + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file README.legal in the main directory of + * this archive for more details. + */ + +#include <linux/regset.h> +#include <linux/ptrace.h> +#include <linux/audit.h> +#include <linux/context_tracking.h> +#include <linux/syscalls.h> + +#include <asm/switch_to.h> +#include <asm/debug.h> + +#define CREATE_TRACE_POINTS +#include <trace/events/syscalls.h> + +#include "ptrace-decl.h" + +/* + * Called by kernel/ptrace.c when detaching.. + * + * Make sure single step bits etc are not set. + */ +void ptrace_disable(struct task_struct *child) +{ + /* make sure the single step bit is not set. */ + user_disable_single_step(child); +} + +long arch_ptrace(struct task_struct *child, long request, + unsigned long addr, unsigned long data) +{ + int ret = -EPERM; + void __user *datavp = (void __user *) data; + unsigned long __user *datalp = datavp; + + switch (request) { + /* read the word at location addr in the USER area. */ + case PTRACE_PEEKUSR: { + unsigned long index, tmp; + + ret = -EIO; + /* convert to index and check */ + index = addr / sizeof(long); + if ((addr & (sizeof(long) - 1)) || !child->thread.regs) + break; + + if (index < PT_FPR0) + ret = ptrace_get_reg(child, (int) index, &tmp); + else + ret = ptrace_get_fpr(child, index, &tmp); + + if (ret) + break; + ret = put_user(tmp, datalp); + break; + } + + /* write the word at location addr in the USER area */ + case PTRACE_POKEUSR: { + unsigned long index; + + ret = -EIO; + /* convert to index and check */ + index = addr / sizeof(long); + if ((addr & (sizeof(long) - 1)) || !child->thread.regs) + break; + + if (index < PT_FPR0) + ret = ptrace_put_reg(child, index, data); + else + ret = ptrace_put_fpr(child, index, data); + break; + } + + case PPC_PTRACE_GETHWDBGINFO: { + struct ppc_debug_info dbginfo; + + ppc_gethwdinfo(&dbginfo); + + if (copy_to_user(datavp, &dbginfo, + sizeof(struct ppc_debug_info))) + return -EFAULT; + return 0; + } + + case PPC_PTRACE_SETHWDEBUG: { + struct ppc_hw_breakpoint bp_info; + + if (copy_from_user(&bp_info, datavp, + sizeof(struct ppc_hw_breakpoint))) + return -EFAULT; + return ppc_set_hwdebug(child, &bp_info); + } + + case PPC_PTRACE_DELHWDEBUG: { + ret = ppc_del_hwdebug(child, data); + break; + } + + case PTRACE_GET_DEBUGREG: + ret = ptrace_get_debugreg(child, addr, datalp); + break; + + case PTRACE_SET_DEBUGREG: + ret = ptrace_set_debugreg(child, addr, data); + break; + +#ifdef CONFIG_PPC64 + case PTRACE_GETREGS64: +#endif + case PTRACE_GETREGS: /* Get all pt_regs from the child. */ + return copy_regset_to_user(child, &user_ppc_native_view, + REGSET_GPR, + 0, sizeof(struct user_pt_regs), + datavp); + +#ifdef CONFIG_PPC64 + case PTRACE_SETREGS64: +#endif + case PTRACE_SETREGS: /* Set all gp regs in the child. */ + return copy_regset_from_user(child, &user_ppc_native_view, + REGSET_GPR, + 0, sizeof(struct user_pt_regs), + datavp); + + case PTRACE_GETFPREGS: /* Get the child FPU state (FPR0...31 + FPSCR) */ + return copy_regset_to_user(child, &user_ppc_native_view, + REGSET_FPR, + 0, sizeof(elf_fpregset_t), + datavp); + + case PTRACE_SETFPREGS: /* Set the child FPU state (FPR0...31 + FPSCR) */ + return copy_regset_from_user(child, &user_ppc_native_view, + REGSET_FPR, + 0, sizeof(elf_fpregset_t), + datavp); + +#ifdef CONFIG_ALTIVEC + case PTRACE_GETVRREGS: + return copy_regset_to_user(child, &user_ppc_native_view, + REGSET_VMX, + 0, (33 * sizeof(vector128) + + sizeof(u32)), + datavp); + + case PTRACE_SETVRREGS: + return copy_regset_from_user(child, &user_ppc_native_view, + REGSET_VMX, + 0, (33 * sizeof(vector128) + + sizeof(u32)), + datavp); +#endif +#ifdef CONFIG_VSX + case PTRACE_GETVSRREGS: + return copy_regset_to_user(child, &user_ppc_native_view, + REGSET_VSX, + 0, 32 * sizeof(double), + datavp); + + case PTRACE_SETVSRREGS: + return copy_regset_from_user(child, &user_ppc_native_view, + REGSET_VSX, + 0, 32 * sizeof(double), + datavp); +#endif +#ifdef CONFIG_SPE + case PTRACE_GETEVRREGS: + /* Get the child spe register state. */ + return copy_regset_to_user(child, &user_ppc_native_view, + REGSET_SPE, 0, 35 * sizeof(u32), + datavp); + + case PTRACE_SETEVRREGS: + /* Set the child spe register state. */ + return copy_regset_from_user(child, &user_ppc_native_view, + REGSET_SPE, 0, 35 * sizeof(u32), + datavp); +#endif + + default: + ret = ptrace_request(child, request, addr, data); + break; + } + return ret; +} + +#ifdef CONFIG_SECCOMP +static int do_seccomp(struct pt_regs *regs) +{ + if (!test_thread_flag(TIF_SECCOMP)) + return 0; + + /* + * The ABI we present to seccomp tracers is that r3 contains + * the syscall return value and orig_gpr3 contains the first + * syscall parameter. This is different to the ptrace ABI where + * both r3 and orig_gpr3 contain the first syscall parameter. + */ + regs->gpr[3] = -ENOSYS; + + /* + * We use the __ version here because we have already checked + * TIF_SECCOMP. If this fails, there is nothing left to do, we + * have already loaded -ENOSYS into r3, or seccomp has put + * something else in r3 (via SECCOMP_RET_ERRNO/TRACE). + */ + if (__secure_computing(NULL)) + return -1; + + /* + * The syscall was allowed by seccomp, restore the register + * state to what audit expects. + * Note that we use orig_gpr3, which means a seccomp tracer can + * modify the first syscall parameter (in orig_gpr3) and also + * allow the syscall to proceed. + */ + regs->gpr[3] = regs->orig_gpr3; + + return 0; +} +#else +static inline int do_seccomp(struct pt_regs *regs) { return 0; } +#endif /* CONFIG_SECCOMP */ + +/** + * do_syscall_trace_enter() - Do syscall tracing on kernel entry. + * @regs: the pt_regs of the task to trace (current) + * + * Performs various types of tracing on syscall entry. This includes seccomp, + * ptrace, syscall tracepoints and audit. + * + * The pt_regs are potentially visible to userspace via ptrace, so their + * contents is ABI. + * + * One or more of the tracers may modify the contents of pt_regs, in particular + * to modify arguments or even the syscall number itself. + * + * It's also possible that a tracer can choose to reject the system call. In + * that case this function will return an illegal syscall number, and will put + * an appropriate return value in regs->r3. + * + * Return: the (possibly changed) syscall number. + */ +long do_syscall_trace_enter(struct pt_regs *regs) +{ + u32 flags; + + flags = read_thread_flags() & (_TIF_SYSCALL_EMU | _TIF_SYSCALL_TRACE); + + if (flags) { + int rc = ptrace_report_syscall_entry(regs); + + if (unlikely(flags & _TIF_SYSCALL_EMU)) { + /* + * A nonzero return code from + * ptrace_report_syscall_entry() tells us to prevent + * the syscall execution, but we are not going to + * execute it anyway. + * + * Returning -1 will skip the syscall execution. We want + * to avoid clobbering any registers, so we don't goto + * the skip label below. + */ + return -1; + } + + if (rc) { + /* + * The tracer decided to abort the syscall. Note that + * the tracer may also just change regs->gpr[0] to an + * invalid syscall number, that is handled below on the + * exit path. + */ + goto skip; + } + } + + /* Run seccomp after ptrace; allow it to set gpr[3]. */ + if (do_seccomp(regs)) + return -1; + + /* Avoid trace and audit when syscall is invalid. */ + if (regs->gpr[0] >= NR_syscalls) + goto skip; + + if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) + trace_sys_enter(regs, regs->gpr[0]); + + if (!is_32bit_task()) + audit_syscall_entry(regs->gpr[0], regs->gpr[3], regs->gpr[4], + regs->gpr[5], regs->gpr[6]); + else + audit_syscall_entry(regs->gpr[0], + regs->gpr[3] & 0xffffffff, + regs->gpr[4] & 0xffffffff, + regs->gpr[5] & 0xffffffff, + regs->gpr[6] & 0xffffffff); + + /* Return the possibly modified but valid syscall number */ + return regs->gpr[0]; + +skip: + /* + * If we are aborting explicitly, or if the syscall number is + * now invalid, set the return value to -ENOSYS. + */ + regs->gpr[3] = -ENOSYS; + return -1; +} + +void do_syscall_trace_leave(struct pt_regs *regs) +{ + int step; + + audit_syscall_exit(regs); + + if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) + trace_sys_exit(regs, regs->result); + + step = test_thread_flag(TIF_SINGLESTEP); + if (step || test_thread_flag(TIF_SYSCALL_TRACE)) + ptrace_report_syscall_exit(regs, step); +} + +void __init pt_regs_check(void); + +/* + * Dummy function, its purpose is to break the build if struct pt_regs and + * struct user_pt_regs don't match. + */ +void __init pt_regs_check(void) +{ + BUILD_BUG_ON(offsetof(struct pt_regs, gpr) != + offsetof(struct user_pt_regs, gpr)); + BUILD_BUG_ON(offsetof(struct pt_regs, nip) != + offsetof(struct user_pt_regs, nip)); + BUILD_BUG_ON(offsetof(struct pt_regs, msr) != + offsetof(struct user_pt_regs, msr)); + BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) != + offsetof(struct user_pt_regs, orig_gpr3)); + BUILD_BUG_ON(offsetof(struct pt_regs, ctr) != + offsetof(struct user_pt_regs, ctr)); + BUILD_BUG_ON(offsetof(struct pt_regs, link) != + offsetof(struct user_pt_regs, link)); + BUILD_BUG_ON(offsetof(struct pt_regs, xer) != + offsetof(struct user_pt_regs, xer)); + BUILD_BUG_ON(offsetof(struct pt_regs, ccr) != + offsetof(struct user_pt_regs, ccr)); +#ifdef __powerpc64__ + BUILD_BUG_ON(offsetof(struct pt_regs, softe) != + offsetof(struct user_pt_regs, softe)); +#else + BUILD_BUG_ON(offsetof(struct pt_regs, mq) != + offsetof(struct user_pt_regs, mq)); +#endif + BUILD_BUG_ON(offsetof(struct pt_regs, trap) != + offsetof(struct user_pt_regs, trap)); + BUILD_BUG_ON(offsetof(struct pt_regs, dar) != + offsetof(struct user_pt_regs, dar)); + BUILD_BUG_ON(offsetof(struct pt_regs, dear) != + offsetof(struct user_pt_regs, dar)); + BUILD_BUG_ON(offsetof(struct pt_regs, dsisr) != + offsetof(struct user_pt_regs, dsisr)); + BUILD_BUG_ON(offsetof(struct pt_regs, esr) != + offsetof(struct user_pt_regs, dsisr)); + BUILD_BUG_ON(offsetof(struct pt_regs, result) != + offsetof(struct user_pt_regs, result)); + + BUILD_BUG_ON(sizeof(struct user_pt_regs) > sizeof(struct pt_regs)); + + // Now check that the pt_regs offsets match the uapi #defines + #define CHECK_REG(_pt, _reg) \ + BUILD_BUG_ON(_pt != (offsetof(struct user_pt_regs, _reg) / \ + sizeof(unsigned long))); + + CHECK_REG(PT_R0, gpr[0]); + CHECK_REG(PT_R1, gpr[1]); + CHECK_REG(PT_R2, gpr[2]); + CHECK_REG(PT_R3, gpr[3]); + CHECK_REG(PT_R4, gpr[4]); + CHECK_REG(PT_R5, gpr[5]); + CHECK_REG(PT_R6, gpr[6]); + CHECK_REG(PT_R7, gpr[7]); + CHECK_REG(PT_R8, gpr[8]); + CHECK_REG(PT_R9, gpr[9]); + CHECK_REG(PT_R10, gpr[10]); + CHECK_REG(PT_R11, gpr[11]); + CHECK_REG(PT_R12, gpr[12]); + CHECK_REG(PT_R13, gpr[13]); + CHECK_REG(PT_R14, gpr[14]); + CHECK_REG(PT_R15, gpr[15]); + CHECK_REG(PT_R16, gpr[16]); + CHECK_REG(PT_R17, gpr[17]); + CHECK_REG(PT_R18, gpr[18]); + CHECK_REG(PT_R19, gpr[19]); + CHECK_REG(PT_R20, gpr[20]); + CHECK_REG(PT_R21, gpr[21]); + CHECK_REG(PT_R22, gpr[22]); + CHECK_REG(PT_R23, gpr[23]); + CHECK_REG(PT_R24, gpr[24]); + CHECK_REG(PT_R25, gpr[25]); + CHECK_REG(PT_R26, gpr[26]); + CHECK_REG(PT_R27, gpr[27]); + CHECK_REG(PT_R28, gpr[28]); + CHECK_REG(PT_R29, gpr[29]); + CHECK_REG(PT_R30, gpr[30]); + CHECK_REG(PT_R31, gpr[31]); + CHECK_REG(PT_NIP, nip); + CHECK_REG(PT_MSR, msr); + CHECK_REG(PT_ORIG_R3, orig_gpr3); + CHECK_REG(PT_CTR, ctr); + CHECK_REG(PT_LNK, link); + CHECK_REG(PT_XER, xer); + CHECK_REG(PT_CCR, ccr); +#ifdef CONFIG_PPC64 + CHECK_REG(PT_SOFTE, softe); +#else + CHECK_REG(PT_MQ, mq); +#endif + CHECK_REG(PT_TRAP, trap); + CHECK_REG(PT_DAR, dar); + CHECK_REG(PT_DSISR, dsisr); + CHECK_REG(PT_RESULT, result); + #undef CHECK_REG + + BUILD_BUG_ON(PT_REGS_COUNT != sizeof(struct user_pt_regs) / sizeof(unsigned long)); + + /* + * PT_DSCR isn't a real reg, but it's important that it doesn't overlap the + * real registers. + */ + BUILD_BUG_ON(PT_DSCR < sizeof(struct user_pt_regs) / sizeof(unsigned long)); + + // ptrace_get/put_fpr() rely on PPC32 and VSX being incompatible + BUILD_BUG_ON(IS_ENABLED(CONFIG_PPC32) && IS_ENABLED(CONFIG_VSX)); +} diff --git a/arch/powerpc/kernel/ptrace/ptrace32.c b/arch/powerpc/kernel/ptrace/ptrace32.c new file mode 100644 index 000000000..19c224808 --- /dev/null +++ b/arch/powerpc/kernel/ptrace/ptrace32.c @@ -0,0 +1,305 @@ +/* + * ptrace for 32-bit processes running on a 64-bit kernel. + * + * PowerPC version + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * + * Derived from "arch/m68k/kernel/ptrace.c" + * Copyright (C) 1994 by Hamish Macdonald + * Taken from linux/kernel/ptrace.c and modified for M680x0. + * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds + * + * Modified by Cort Dougan (cort@hq.fsmlabs.com) + * and Paul Mackerras (paulus@samba.org). + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of + * this archive for more details. + */ + +#include <linux/ptrace.h> +#include <linux/regset.h> +#include <linux/compat.h> + +#include <asm/switch_to.h> + +#include "ptrace-decl.h" + +/* + * does not yet catch signals sent when the child dies. + * in exit.c or in signal.c. + */ + +/* Macros to workout the correct index for the FPR in the thread struct */ +#define FPRNUMBER(i) (((i) - PT_FPR0) >> 1) +#define FPRHALF(i) (((i) - PT_FPR0) & 1) +#define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i) * 2 + FPRHALF(i) + +long compat_arch_ptrace(struct task_struct *child, compat_long_t request, + compat_ulong_t caddr, compat_ulong_t cdata) +{ + unsigned long addr = caddr; + unsigned long data = cdata; + int ret; + + switch (request) { + /* + * Read 4 bytes of the other process' storage + * data is a pointer specifying where the user wants the + * 4 bytes copied into + * addr is a pointer in the user's storage that contains an 8 byte + * address in the other process of the 4 bytes that is to be read + * (this is run in a 32-bit process looking at a 64-bit process) + * when I and D space are separate, these will need to be fixed. + */ + case PPC_PTRACE_PEEKTEXT_3264: + case PPC_PTRACE_PEEKDATA_3264: { + u32 tmp; + int copied; + u32 __user * addrOthers; + + ret = -EIO; + + /* Get the addr in the other process that we want to read */ + if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) + break; + + copied = ptrace_access_vm(child, (u64)addrOthers, &tmp, + sizeof(tmp), FOLL_FORCE); + if (copied != sizeof(tmp)) + break; + ret = put_user(tmp, (u32 __user *)data); + break; + } + + /* Read a register (specified by ADDR) out of the "user area" */ + case PTRACE_PEEKUSR: { + int index; + unsigned long tmp; + + ret = -EIO; + /* convert to index and check */ + index = (unsigned long) addr >> 2; + if ((addr & 3) || (index > PT_FPSCR32)) + break; + + if (index < PT_FPR0) { + ret = ptrace_get_reg(child, index, &tmp); + if (ret) + break; + } else { + flush_fp_to_thread(child); + /* + * the user space code considers the floating point + * to be an array of unsigned int (32 bits) - the + * index passed in is based on this assumption. + */ + tmp = ((unsigned int *)child->thread.fp_state.fpr) + [FPRINDEX(index)]; + } + ret = put_user((unsigned int)tmp, (u32 __user *)data); + break; + } + + /* + * Read 4 bytes out of the other process' pt_regs area + * data is a pointer specifying where the user wants the + * 4 bytes copied into + * addr is the offset into the other process' pt_regs structure + * that is to be read + * (this is run in a 32-bit process looking at a 64-bit process) + */ + case PPC_PTRACE_PEEKUSR_3264: { + u32 index; + u32 reg32bits; + u64 tmp; + u32 numReg; + u32 part; + + ret = -EIO; + /* Determine which register the user wants */ + index = (u64)addr >> 2; + numReg = index / 2; + /* Determine which part of the register the user wants */ + if (index % 2) + part = 1; /* want the 2nd half of the register (right-most). */ + else + part = 0; /* want the 1st half of the register (left-most). */ + + /* Validate the input - check to see if address is on the wrong boundary + * or beyond the end of the user area + */ + if ((addr & 3) || numReg > PT_FPSCR) + break; + + if (numReg >= PT_FPR0) { + flush_fp_to_thread(child); + /* get 64 bit FPR */ + tmp = child->thread.fp_state.fpr[numReg - PT_FPR0][0]; + } else { /* register within PT_REGS struct */ + unsigned long tmp2; + ret = ptrace_get_reg(child, numReg, &tmp2); + if (ret) + break; + tmp = tmp2; + } + reg32bits = ((u32*)&tmp)[part]; + ret = put_user(reg32bits, (u32 __user *)data); + break; + } + + /* + * Write 4 bytes into the other process' storage + * data is the 4 bytes that the user wants written + * addr is a pointer in the user's storage that contains an + * 8 byte address in the other process where the 4 bytes + * that is to be written + * (this is run in a 32-bit process looking at a 64-bit process) + * when I and D space are separate, these will need to be fixed. + */ + case PPC_PTRACE_POKETEXT_3264: + case PPC_PTRACE_POKEDATA_3264: { + u32 tmp = data; + u32 __user * addrOthers; + + /* Get the addr in the other process that we want to write into */ + ret = -EIO; + if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) + break; + ret = 0; + if (ptrace_access_vm(child, (u64)addrOthers, &tmp, + sizeof(tmp), + FOLL_FORCE | FOLL_WRITE) == sizeof(tmp)) + break; + ret = -EIO; + break; + } + + /* write the word at location addr in the USER area */ + case PTRACE_POKEUSR: { + unsigned long index; + + ret = -EIO; + /* convert to index and check */ + index = (unsigned long) addr >> 2; + if ((addr & 3) || (index > PT_FPSCR32)) + break; + + if (index < PT_FPR0) { + ret = ptrace_put_reg(child, index, data); + } else { + flush_fp_to_thread(child); + /* + * the user space code considers the floating point + * to be an array of unsigned int (32 bits) - the + * index passed in is based on this assumption. + */ + ((unsigned int *)child->thread.fp_state.fpr) + [FPRINDEX(index)] = data; + ret = 0; + } + break; + } + + /* + * Write 4 bytes into the other process' pt_regs area + * data is the 4 bytes that the user wants written + * addr is the offset into the other process' pt_regs structure + * that is to be written into + * (this is run in a 32-bit process looking at a 64-bit process) + */ + case PPC_PTRACE_POKEUSR_3264: { + u32 index; + u32 numReg; + + ret = -EIO; + /* Determine which register the user wants */ + index = (u64)addr >> 2; + numReg = index / 2; + + /* + * Validate the input - check to see if address is on the + * wrong boundary or beyond the end of the user area + */ + if ((addr & 3) || (numReg > PT_FPSCR)) + break; + if (numReg < PT_FPR0) { + unsigned long freg; + ret = ptrace_get_reg(child, numReg, &freg); + if (ret) + break; + if (index % 2) + freg = (freg & ~0xfffffffful) | (data & 0xfffffffful); + else + freg = (freg & 0xfffffffful) | (data << 32); + ret = ptrace_put_reg(child, numReg, freg); + } else { + u64 *tmp; + flush_fp_to_thread(child); + /* get 64 bit FPR ... */ + tmp = &child->thread.fp_state.fpr[numReg - PT_FPR0][0]; + /* ... write the 32 bit part we want */ + ((u32 *)tmp)[index % 2] = data; + ret = 0; + } + break; + } + + case PTRACE_GET_DEBUGREG: { +#ifndef CONFIG_PPC_ADV_DEBUG_REGS + unsigned long dabr_fake; +#endif + ret = -EINVAL; + /* We only support one DABR and no IABRS at the moment */ + if (addr > 0) + break; +#ifdef CONFIG_PPC_ADV_DEBUG_REGS + ret = put_user(child->thread.debug.dac1, (u32 __user *)data); +#else + dabr_fake = ( + (child->thread.hw_brk[0].address & (~HW_BRK_TYPE_DABR)) | + (child->thread.hw_brk[0].type & HW_BRK_TYPE_DABR)); + ret = put_user(dabr_fake, (u32 __user *)data); +#endif + break; + } + + case PTRACE_GETREGS: /* Get all pt_regs from the child. */ + return copy_regset_to_user( + child, task_user_regset_view(current), 0, + 0, PT_REGS_COUNT * sizeof(compat_long_t), + compat_ptr(data)); + + case PTRACE_SETREGS: /* Set all gp regs in the child. */ + return copy_regset_from_user( + child, task_user_regset_view(current), 0, + 0, PT_REGS_COUNT * sizeof(compat_long_t), + compat_ptr(data)); + + case PTRACE_GETFPREGS: + case PTRACE_SETFPREGS: + case PTRACE_GETVRREGS: + case PTRACE_SETVRREGS: + case PTRACE_GETVSRREGS: + case PTRACE_SETVSRREGS: + case PTRACE_GETREGS64: + case PTRACE_SETREGS64: + case PTRACE_KILL: + case PTRACE_SINGLESTEP: + case PTRACE_DETACH: + case PTRACE_SET_DEBUGREG: + case PTRACE_SYSCALL: + case PTRACE_CONT: + case PPC_PTRACE_GETHWDBGINFO: + case PPC_PTRACE_SETHWDEBUG: + case PPC_PTRACE_DELHWDEBUG: + ret = arch_ptrace(child, request, addr, data); + break; + + default: + ret = compat_ptrace_request(child, request, addr, data); + break; + } + + return ret; +} diff --git a/arch/powerpc/kernel/reloc_32.S b/arch/powerpc/kernel/reloc_32.S new file mode 100644 index 000000000..0508c14b4 --- /dev/null +++ b/arch/powerpc/kernel/reloc_32.S @@ -0,0 +1,205 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Code to process dynamic relocations for PPC32. + * + * Copyrights (C) IBM Corporation, 2011. + * Author: Suzuki Poulose <suzuki@in.ibm.com> + * + * - Based on ppc64 code - reloc_64.S + */ + +#include <asm/ppc_asm.h> + +/* Dynamic section table entry tags */ +DT_RELA = 7 /* Tag for Elf32_Rela section */ +DT_RELASZ = 8 /* Size of the Rela relocs */ +DT_RELAENT = 9 /* Size of one Rela reloc entry */ + +STN_UNDEF = 0 /* Undefined symbol index */ +STB_LOCAL = 0 /* Local binding for the symbol */ + +R_PPC_ADDR16_LO = 4 /* Lower half of (S+A) */ +R_PPC_ADDR16_HI = 5 /* Upper half of (S+A) */ +R_PPC_ADDR16_HA = 6 /* High Adjusted (S+A) */ +R_PPC_RELATIVE = 22 + +/* + * r3 = desired final address + */ + +_GLOBAL(relocate) + + mflr r0 /* Save our LR */ + bcl 20,31,$+4 /* Find our current runtime address */ +0: mflr r12 /* Make it accessible */ + mtlr r0 + + lwz r11, (p_dyn - 0b)(r12) + add r11, r11, r12 /* runtime address of .dynamic section */ + lwz r9, (p_rela - 0b)(r12) + add r9, r9, r12 /* runtime address of .rela.dyn section */ + lwz r10, (p_st - 0b)(r12) + add r10, r10, r12 /* runtime address of _stext section */ + lwz r13, (p_sym - 0b)(r12) + add r13, r13, r12 /* runtime address of .dynsym section */ + + /* + * Scan the dynamic section for RELA, RELASZ entries + */ + li r6, 0 + li r7, 0 + li r8, 0 +1: lwz r5, 0(r11) /* ELF_Dyn.d_tag */ + cmpwi r5, 0 /* End of ELF_Dyn[] */ + beq eodyn + cmpwi r5, DT_RELA + bne relasz + lwz r7, 4(r11) /* r7 = rela.link */ + b skip +relasz: + cmpwi r5, DT_RELASZ + bne relaent + lwz r8, 4(r11) /* r8 = Total Rela relocs size */ + b skip +relaent: + cmpwi r5, DT_RELAENT + bne skip + lwz r6, 4(r11) /* r6 = Size of one Rela reloc */ +skip: + addi r11, r11, 8 + b 1b +eodyn: /* End of Dyn Table scan */ + + /* Check if we have found all the entries */ + cmpwi r7, 0 + beq done + cmpwi r8, 0 + beq done + cmpwi r6, 0 + beq done + + + /* + * Work out the current offset from the link time address of .rela + * section. + * cur_offset[r7] = rela.run[r9] - rela.link [r7] + * _stext.link[r12] = _stext.run[r10] - cur_offset[r7] + * final_offset[r3] = _stext.final[r3] - _stext.link[r12] + */ + subf r7, r7, r9 /* cur_offset */ + subf r12, r7, r10 + subf r3, r12, r3 /* final_offset */ + + subf r8, r6, r8 /* relaz -= relaent */ + /* + * Scan through the .rela table and process each entry + * r9 - points to the current .rela table entry + * r13 - points to the symbol table + */ + + /* + * Check if we have a relocation based on symbol + * r5 will hold the value of the symbol. + */ +applyrela: + lwz r4, 4(r9) /* r4 = rela.r_info */ + srwi r5, r4, 8 /* ELF32_R_SYM(r_info) */ + cmpwi r5, STN_UNDEF /* sym == STN_UNDEF ? */ + beq get_type /* value = 0 */ + /* Find the value of the symbol at index(r5) */ + slwi r5, r5, 4 /* r5 = r5 * sizeof(Elf32_Sym) */ + add r12, r13, r5 /* r12 = &__dyn_sym[Index] */ + + /* + * GNU ld has a bug, where dynamic relocs based on + * STB_LOCAL symbols, the value should be assumed + * to be zero. - Alan Modra + */ + /* XXX: Do we need to check if we are using GNU ld ? */ + lbz r5, 12(r12) /* r5 = dyn_sym[Index].st_info */ + extrwi r5, r5, 4, 24 /* r5 = ELF32_ST_BIND(r5) */ + cmpwi r5, STB_LOCAL /* st_value = 0, ld bug */ + beq get_type /* We have r5 = 0 */ + lwz r5, 4(r12) /* r5 = __dyn_sym[Index].st_value */ + +get_type: + /* Load the relocation type to r4 */ + extrwi r4, r4, 8, 24 /* r4 = ELF32_R_TYPE(r_info) = ((char*)r4)[3] */ + + /* R_PPC_RELATIVE */ + cmpwi r4, R_PPC_RELATIVE + bne hi16 + lwz r4, 0(r9) /* r_offset */ + lwz r0, 8(r9) /* r_addend */ + add r0, r0, r3 /* final addend */ + stwx r0, r4, r7 /* memory[r4+r7]) = (u32)r0 */ + b nxtrela /* continue */ + + /* R_PPC_ADDR16_HI */ +hi16: + cmpwi r4, R_PPC_ADDR16_HI + bne ha16 + lwz r4, 0(r9) /* r_offset */ + lwz r0, 8(r9) /* r_addend */ + add r0, r0, r3 + add r0, r0, r5 /* r0 = (S+A+Offset) */ + extrwi r0, r0, 16, 0 /* r0 = (r0 >> 16) */ + b store_half + + /* R_PPC_ADDR16_HA */ +ha16: + cmpwi r4, R_PPC_ADDR16_HA + bne lo16 + lwz r4, 0(r9) /* r_offset */ + lwz r0, 8(r9) /* r_addend */ + add r0, r0, r3 + add r0, r0, r5 /* r0 = (S+A+Offset) */ + extrwi r5, r0, 1, 16 /* Extract bit 16 */ + extrwi r0, r0, 16, 0 /* r0 = (r0 >> 16) */ + add r0, r0, r5 /* Add it to r0 */ + b store_half + + /* R_PPC_ADDR16_LO */ +lo16: + cmpwi r4, R_PPC_ADDR16_LO + bne unknown_type + lwz r4, 0(r9) /* r_offset */ + lwz r0, 8(r9) /* r_addend */ + add r0, r0, r3 + add r0, r0, r5 /* r0 = (S+A+Offset) */ + extrwi r0, r0, 16, 16 /* r0 &= 0xffff */ + /* Fall through to */ + + /* Store half word */ +store_half: + sthx r0, r4, r7 /* memory[r4+r7] = (u16)r0 */ + +nxtrela: + /* + * We have to flush the modified instructions to the + * main storage from the d-cache. And also, invalidate the + * cached instructions in i-cache which has been modified. + * + * We delay the sync / isync operation till the end, since + * we won't be executing the modified instructions until + * we return from here. + */ + dcbst r4,r7 + sync /* Ensure the data is flushed before icbi */ + icbi r4,r7 +unknown_type: + cmpwi r8, 0 /* relasz = 0 ? */ + ble done + add r9, r9, r6 /* move to next entry in the .rela table */ + subf r8, r6, r8 /* relasz -= relaent */ + b applyrela + +done: + sync /* Wait for the flush to finish */ + isync /* Discard prefetched instructions */ + blr + +p_dyn: .long __dynamic_start - 0b +p_rela: .long __rela_dyn_start - 0b +p_sym: .long __dynamic_symtab - 0b +p_st: .long _stext - 0b diff --git a/arch/powerpc/kernel/reloc_64.S b/arch/powerpc/kernel/reloc_64.S new file mode 100644 index 000000000..efd52f2e7 --- /dev/null +++ b/arch/powerpc/kernel/reloc_64.S @@ -0,0 +1,111 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Code to process dynamic relocations in the kernel. + * + * Copyright 2008 Paul Mackerras, IBM Corp. + */ + +#include <asm/ppc_asm.h> + +RELA = 7 +RELASZ = 8 +RELAENT = 9 +R_PPC64_RELATIVE = 22 +R_PPC64_UADDR64 = 43 + +/* + * r3 = desired final address of kernel + */ +_GLOBAL(relocate) + mflr r0 + bcl 20,31,$+4 +0: mflr r12 /* r12 has runtime addr of label 0 */ + mtlr r0 + ld r11,(p_dyn - 0b)(r12) + add r11,r11,r12 /* r11 has runtime addr of .dynamic section */ + ld r9,(p_rela - 0b)(r12) + add r9,r9,r12 /* r9 has runtime addr of .rela.dyn section */ + ld r10,(p_st - 0b)(r12) + add r10,r10,r12 /* r10 has runtime addr of _stext */ + ld r4,(p_sym - 0b)(r12) + add r4,r4,r12 /* r4 has runtime addr of .dynsym */ + + /* + * Scan the dynamic section for the RELA, RELASZ and RELAENT entries. + */ + li r7,0 + li r8,0 +.Ltags: + ld r6,0(r11) /* get tag */ + cmpdi r6,0 + beq .Lend_of_list /* end of list */ + cmpdi r6,RELA + bne 2f + ld r7,8(r11) /* get RELA pointer in r7 */ + b 4f +2: cmpdi r6,RELASZ + bne 3f + ld r8,8(r11) /* get RELASZ value in r8 */ + b 4f +3: cmpdi r6,RELAENT + bne 4f + ld r12,8(r11) /* get RELAENT value in r12 */ +4: addi r11,r11,16 + b .Ltags +.Lend_of_list: + cmpdi r7,0 /* check we have RELA, RELASZ, RELAENT */ + cmpdi cr1,r8,0 + beq .Lout + beq cr1,.Lout + cmpdi r12,0 + beq .Lout + + /* + * Work out linktime address of _stext and hence the + * relocation offset to be applied. + * cur_offset [r7] = rela.run [r9] - rela.link [r7] + * _stext.link [r10] = _stext.run [r10] - cur_offset [r7] + * final_offset [r3] = _stext.final [r3] - _stext.link [r10] + */ + subf r7,r7,r9 /* cur_offset */ + subf r10,r7,r10 + subf r3,r10,r3 /* final_offset */ + + /* + * Run through the list of relocations and process the + * R_PPC64_RELATIVE and R_PPC64_UADDR64 ones. + */ + divd r8,r8,r12 /* RELASZ / RELAENT */ + mtctr r8 +.Lrels: ld r0,8(r9) /* ELF64_R_TYPE(reloc->r_info) */ + cmpdi r0,R_PPC64_RELATIVE + bne .Luaddr64 + ld r6,0(r9) /* reloc->r_offset */ + ld r0,16(r9) /* reloc->r_addend */ + b .Lstore +.Luaddr64: + srdi r5,r0,32 /* ELF64_R_SYM(reloc->r_info) */ + clrldi r0,r0,32 + cmpdi r0,R_PPC64_UADDR64 + bne .Lnext + ld r6,0(r9) + ld r0,16(r9) + mulli r5,r5,24 /* 24 == sizeof(elf64_sym) */ + add r5,r5,r4 /* elf64_sym[ELF64_R_SYM] */ + ld r5,8(r5) + add r0,r0,r5 +.Lstore: + add r0,r0,r3 + stdx r0,r7,r6 +.Lnext: + add r9,r9,r12 + bdnz .Lrels +.Lout: + blr + +.balign 8 +p_dyn: .8byte __dynamic_start - 0b +p_rela: .8byte __rela_dyn_start - 0b +p_sym: .8byte __dynamic_symtab - 0b +p_st: .8byte _stext - 0b + diff --git a/arch/powerpc/kernel/rtas-proc.c b/arch/powerpc/kernel/rtas-proc.c new file mode 100644 index 000000000..081b2b741 --- /dev/null +++ b/arch/powerpc/kernel/rtas-proc.c @@ -0,0 +1,767 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2000 Tilmann Bitterberg + * (tilmann@bitterberg.de) + * + * RTAS (Runtime Abstraction Services) stuff + * Intention is to provide a clean user interface + * to use the RTAS. + * + * TODO: + * Split off a header file and maybe move it to a different + * location. Write Documentation on what the /proc/rtas/ entries + * actually do. + */ + +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/proc_fs.h> +#include <linux/stat.h> +#include <linux/ctype.h> +#include <linux/time.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/seq_file.h> +#include <linux/bitops.h> +#include <linux/rtc.h> +#include <linux/of.h> + +#include <linux/uaccess.h> +#include <asm/processor.h> +#include <asm/io.h> +#include <asm/rtas.h> +#include <asm/machdep.h> /* for ppc_md */ +#include <asm/time.h> + +/* Token for Sensors */ +#define KEY_SWITCH 0x0001 +#define ENCLOSURE_SWITCH 0x0002 +#define THERMAL_SENSOR 0x0003 +#define LID_STATUS 0x0004 +#define POWER_SOURCE 0x0005 +#define BATTERY_VOLTAGE 0x0006 +#define BATTERY_REMAINING 0x0007 +#define BATTERY_PERCENTAGE 0x0008 +#define EPOW_SENSOR 0x0009 +#define BATTERY_CYCLESTATE 0x000a +#define BATTERY_CHARGING 0x000b + +/* IBM specific sensors */ +#define IBM_SURVEILLANCE 0x2328 /* 9000 */ +#define IBM_FANRPM 0x2329 /* 9001 */ +#define IBM_VOLTAGE 0x232a /* 9002 */ +#define IBM_DRCONNECTOR 0x232b /* 9003 */ +#define IBM_POWERSUPPLY 0x232c /* 9004 */ + +/* Status return values */ +#define SENSOR_CRITICAL_HIGH 13 +#define SENSOR_WARNING_HIGH 12 +#define SENSOR_NORMAL 11 +#define SENSOR_WARNING_LOW 10 +#define SENSOR_CRITICAL_LOW 9 +#define SENSOR_SUCCESS 0 +#define SENSOR_HW_ERROR -1 +#define SENSOR_BUSY -2 +#define SENSOR_NOT_EXIST -3 +#define SENSOR_DR_ENTITY -9000 + +/* Location Codes */ +#define LOC_SCSI_DEV_ADDR 'A' +#define LOC_SCSI_DEV_LOC 'B' +#define LOC_CPU 'C' +#define LOC_DISKETTE 'D' +#define LOC_ETHERNET 'E' +#define LOC_FAN 'F' +#define LOC_GRAPHICS 'G' +/* reserved / not used 'H' */ +#define LOC_IO_ADAPTER 'I' +/* reserved / not used 'J' */ +#define LOC_KEYBOARD 'K' +#define LOC_LCD 'L' +#define LOC_MEMORY 'M' +#define LOC_NV_MEMORY 'N' +#define LOC_MOUSE 'O' +#define LOC_PLANAR 'P' +#define LOC_OTHER_IO 'Q' +#define LOC_PARALLEL 'R' +#define LOC_SERIAL 'S' +#define LOC_DEAD_RING 'T' +#define LOC_RACKMOUNTED 'U' /* for _u_nit is rack mounted */ +#define LOC_VOLTAGE 'V' +#define LOC_SWITCH_ADAPTER 'W' +#define LOC_OTHER 'X' +#define LOC_FIRMWARE 'Y' +#define LOC_SCSI 'Z' + +/* Tokens for indicators */ +#define TONE_FREQUENCY 0x0001 /* 0 - 1000 (HZ)*/ +#define TONE_VOLUME 0x0002 /* 0 - 100 (%) */ +#define SYSTEM_POWER_STATE 0x0003 +#define WARNING_LIGHT 0x0004 +#define DISK_ACTIVITY_LIGHT 0x0005 +#define HEX_DISPLAY_UNIT 0x0006 +#define BATTERY_WARNING_TIME 0x0007 +#define CONDITION_CYCLE_REQUEST 0x0008 +#define SURVEILLANCE_INDICATOR 0x2328 /* 9000 */ +#define DR_ACTION 0x2329 /* 9001 */ +#define DR_INDICATOR 0x232a /* 9002 */ +/* 9003 - 9004: Vendor specific */ +/* 9006 - 9999: Vendor specific */ + +/* other */ +#define MAX_SENSORS 17 /* I only know of 17 sensors */ +#define MAX_LINELENGTH 256 +#define SENSOR_PREFIX "ibm,sensor-" +#define cel_to_fahr(x) ((x*9/5)+32) + +struct individual_sensor { + unsigned int token; + unsigned int quant; +}; + +struct rtas_sensors { + struct individual_sensor sensor[MAX_SENSORS]; + unsigned int quant; +}; + +/* Globals */ +static struct rtas_sensors sensors; +static struct device_node *rtas_node = NULL; +static unsigned long power_on_time = 0; /* Save the time the user set */ +static char progress_led[MAX_LINELENGTH]; + +static unsigned long rtas_tone_frequency = 1000; +static unsigned long rtas_tone_volume = 0; + +/* ****************************************************************** */ +/* Declarations */ +static int ppc_rtas_sensors_show(struct seq_file *m, void *v); +static int ppc_rtas_clock_show(struct seq_file *m, void *v); +static ssize_t ppc_rtas_clock_write(struct file *file, + const char __user *buf, size_t count, loff_t *ppos); +static int ppc_rtas_progress_show(struct seq_file *m, void *v); +static ssize_t ppc_rtas_progress_write(struct file *file, + const char __user *buf, size_t count, loff_t *ppos); +static int ppc_rtas_poweron_show(struct seq_file *m, void *v); +static ssize_t ppc_rtas_poweron_write(struct file *file, + const char __user *buf, size_t count, loff_t *ppos); + +static ssize_t ppc_rtas_tone_freq_write(struct file *file, + const char __user *buf, size_t count, loff_t *ppos); +static int ppc_rtas_tone_freq_show(struct seq_file *m, void *v); +static ssize_t ppc_rtas_tone_volume_write(struct file *file, + const char __user *buf, size_t count, loff_t *ppos); +static int ppc_rtas_tone_volume_show(struct seq_file *m, void *v); +static int ppc_rtas_rmo_buf_show(struct seq_file *m, void *v); + +static int poweron_open(struct inode *inode, struct file *file) +{ + return single_open(file, ppc_rtas_poweron_show, NULL); +} + +static const struct proc_ops ppc_rtas_poweron_proc_ops = { + .proc_open = poweron_open, + .proc_read = seq_read, + .proc_lseek = seq_lseek, + .proc_write = ppc_rtas_poweron_write, + .proc_release = single_release, +}; + +static int progress_open(struct inode *inode, struct file *file) +{ + return single_open(file, ppc_rtas_progress_show, NULL); +} + +static const struct proc_ops ppc_rtas_progress_proc_ops = { + .proc_open = progress_open, + .proc_read = seq_read, + .proc_lseek = seq_lseek, + .proc_write = ppc_rtas_progress_write, + .proc_release = single_release, +}; + +static int clock_open(struct inode *inode, struct file *file) +{ + return single_open(file, ppc_rtas_clock_show, NULL); +} + +static const struct proc_ops ppc_rtas_clock_proc_ops = { + .proc_open = clock_open, + .proc_read = seq_read, + .proc_lseek = seq_lseek, + .proc_write = ppc_rtas_clock_write, + .proc_release = single_release, +}; + +static int tone_freq_open(struct inode *inode, struct file *file) +{ + return single_open(file, ppc_rtas_tone_freq_show, NULL); +} + +static const struct proc_ops ppc_rtas_tone_freq_proc_ops = { + .proc_open = tone_freq_open, + .proc_read = seq_read, + .proc_lseek = seq_lseek, + .proc_write = ppc_rtas_tone_freq_write, + .proc_release = single_release, +}; + +static int tone_volume_open(struct inode *inode, struct file *file) +{ + return single_open(file, ppc_rtas_tone_volume_show, NULL); +} + +static const struct proc_ops ppc_rtas_tone_volume_proc_ops = { + .proc_open = tone_volume_open, + .proc_read = seq_read, + .proc_lseek = seq_lseek, + .proc_write = ppc_rtas_tone_volume_write, + .proc_release = single_release, +}; + +static int ppc_rtas_find_all_sensors(void); +static void ppc_rtas_process_sensor(struct seq_file *m, + struct individual_sensor *s, int state, int error, const char *loc); +static char *ppc_rtas_process_error(int error); +static void get_location_code(struct seq_file *m, + struct individual_sensor *s, const char *loc); +static void check_location_string(struct seq_file *m, const char *c); +static void check_location(struct seq_file *m, const char *c); + +static int __init proc_rtas_init(void) +{ + if (!machine_is(pseries)) + return -ENODEV; + + rtas_node = of_find_node_by_name(NULL, "rtas"); + if (rtas_node == NULL) + return -ENODEV; + + proc_create("powerpc/rtas/progress", 0644, NULL, + &ppc_rtas_progress_proc_ops); + proc_create("powerpc/rtas/clock", 0644, NULL, + &ppc_rtas_clock_proc_ops); + proc_create("powerpc/rtas/poweron", 0644, NULL, + &ppc_rtas_poweron_proc_ops); + proc_create_single("powerpc/rtas/sensors", 0444, NULL, + ppc_rtas_sensors_show); + proc_create("powerpc/rtas/frequency", 0644, NULL, + &ppc_rtas_tone_freq_proc_ops); + proc_create("powerpc/rtas/volume", 0644, NULL, + &ppc_rtas_tone_volume_proc_ops); + proc_create_single("powerpc/rtas/rmo_buffer", 0400, NULL, + ppc_rtas_rmo_buf_show); + return 0; +} + +__initcall(proc_rtas_init); + +static int parse_number(const char __user *p, size_t count, u64 *val) +{ + char buf[40]; + + if (count > 39) + return -EINVAL; + + if (copy_from_user(buf, p, count)) + return -EFAULT; + + buf[count] = 0; + + return kstrtoull(buf, 10, val); +} + +/* ****************************************************************** */ +/* POWER-ON-TIME */ +/* ****************************************************************** */ +static ssize_t ppc_rtas_poweron_write(struct file *file, + const char __user *buf, size_t count, loff_t *ppos) +{ + struct rtc_time tm; + time64_t nowtime; + int error = parse_number(buf, count, &nowtime); + if (error) + return error; + + power_on_time = nowtime; /* save the time */ + + rtc_time64_to_tm(nowtime, &tm); + + error = rtas_call(rtas_token("set-time-for-power-on"), 7, 1, NULL, + tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, + tm.tm_hour, tm.tm_min, tm.tm_sec, 0 /* nano */); + if (error) + printk(KERN_WARNING "error: setting poweron time returned: %s\n", + ppc_rtas_process_error(error)); + return count; +} +/* ****************************************************************** */ +static int ppc_rtas_poweron_show(struct seq_file *m, void *v) +{ + if (power_on_time == 0) + seq_printf(m, "Power on time not set\n"); + else + seq_printf(m, "%lu\n",power_on_time); + return 0; +} + +/* ****************************************************************** */ +/* PROGRESS */ +/* ****************************************************************** */ +static ssize_t ppc_rtas_progress_write(struct file *file, + const char __user *buf, size_t count, loff_t *ppos) +{ + unsigned long hex; + + if (count >= MAX_LINELENGTH) + count = MAX_LINELENGTH -1; + if (copy_from_user(progress_led, buf, count)) { /* save the string */ + return -EFAULT; + } + progress_led[count] = 0; + + /* Lets see if the user passed hexdigits */ + hex = simple_strtoul(progress_led, NULL, 10); + + rtas_progress ((char *)progress_led, hex); + return count; + + /* clear the line */ + /* rtas_progress(" ", 0xffff);*/ +} +/* ****************************************************************** */ +static int ppc_rtas_progress_show(struct seq_file *m, void *v) +{ + if (progress_led[0]) + seq_printf(m, "%s\n", progress_led); + return 0; +} + +/* ****************************************************************** */ +/* CLOCK */ +/* ****************************************************************** */ +static ssize_t ppc_rtas_clock_write(struct file *file, + const char __user *buf, size_t count, loff_t *ppos) +{ + struct rtc_time tm; + time64_t nowtime; + int error = parse_number(buf, count, &nowtime); + if (error) + return error; + + rtc_time64_to_tm(nowtime, &tm); + error = rtas_call(rtas_token("set-time-of-day"), 7, 1, NULL, + tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, + tm.tm_hour, tm.tm_min, tm.tm_sec, 0); + if (error) + printk(KERN_WARNING "error: setting the clock returned: %s\n", + ppc_rtas_process_error(error)); + return count; +} +/* ****************************************************************** */ +static int ppc_rtas_clock_show(struct seq_file *m, void *v) +{ + int ret[8]; + int error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret); + + if (error) { + printk(KERN_WARNING "error: reading the clock returned: %s\n", + ppc_rtas_process_error(error)); + seq_printf(m, "0"); + } else { + unsigned int year, mon, day, hour, min, sec; + year = ret[0]; mon = ret[1]; day = ret[2]; + hour = ret[3]; min = ret[4]; sec = ret[5]; + seq_printf(m, "%lld\n", + mktime64(year, mon, day, hour, min, sec)); + } + return 0; +} + +/* ****************************************************************** */ +/* SENSOR STUFF */ +/* ****************************************************************** */ +static int ppc_rtas_sensors_show(struct seq_file *m, void *v) +{ + int i,j; + int state, error; + int get_sensor_state = rtas_token("get-sensor-state"); + + seq_printf(m, "RTAS (RunTime Abstraction Services) Sensor Information\n"); + seq_printf(m, "Sensor\t\tValue\t\tCondition\tLocation\n"); + seq_printf(m, "********************************************************\n"); + + if (ppc_rtas_find_all_sensors() != 0) { + seq_printf(m, "\nNo sensors are available\n"); + return 0; + } + + for (i=0; i<sensors.quant; i++) { + struct individual_sensor *p = &sensors.sensor[i]; + char rstr[64]; + const char *loc; + int llen, offs; + + sprintf (rstr, SENSOR_PREFIX"%04d", p->token); + loc = of_get_property(rtas_node, rstr, &llen); + + /* A sensor may have multiple instances */ + for (j = 0, offs = 0; j <= p->quant; j++) { + error = rtas_call(get_sensor_state, 2, 2, &state, + p->token, j); + + ppc_rtas_process_sensor(m, p, state, error, loc); + seq_putc(m, '\n'); + if (loc) { + offs += strlen(loc) + 1; + loc += strlen(loc) + 1; + if (offs >= llen) + loc = NULL; + } + } + } + return 0; +} + +/* ****************************************************************** */ + +static int ppc_rtas_find_all_sensors(void) +{ + const unsigned int *utmp; + int len, i; + + utmp = of_get_property(rtas_node, "rtas-sensors", &len); + if (utmp == NULL) { + printk (KERN_ERR "error: could not get rtas-sensors\n"); + return 1; + } + + sensors.quant = len / 8; /* int + int */ + + for (i=0; i<sensors.quant; i++) { + sensors.sensor[i].token = *utmp++; + sensors.sensor[i].quant = *utmp++; + } + return 0; +} + +/* ****************************************************************** */ +/* + * Builds a string of what rtas returned + */ +static char *ppc_rtas_process_error(int error) +{ + switch (error) { + case SENSOR_CRITICAL_HIGH: + return "(critical high)"; + case SENSOR_WARNING_HIGH: + return "(warning high)"; + case SENSOR_NORMAL: + return "(normal)"; + case SENSOR_WARNING_LOW: + return "(warning low)"; + case SENSOR_CRITICAL_LOW: + return "(critical low)"; + case SENSOR_SUCCESS: + return "(read ok)"; + case SENSOR_HW_ERROR: + return "(hardware error)"; + case SENSOR_BUSY: + return "(busy)"; + case SENSOR_NOT_EXIST: + return "(non existent)"; + case SENSOR_DR_ENTITY: + return "(dr entity removed)"; + default: + return "(UNKNOWN)"; + } +} + +/* ****************************************************************** */ +/* + * Builds a string out of what the sensor said + */ + +static void ppc_rtas_process_sensor(struct seq_file *m, + struct individual_sensor *s, int state, int error, const char *loc) +{ + /* Defined return vales */ + const char * key_switch[] = { "Off\t", "Normal\t", "Secure\t", + "Maintenance" }; + const char * enclosure_switch[] = { "Closed", "Open" }; + const char * lid_status[] = { " ", "Open", "Closed" }; + const char * power_source[] = { "AC\t", "Battery", + "AC & Battery" }; + const char * battery_remaining[] = { "Very Low", "Low", "Mid", "High" }; + const char * epow_sensor[] = { + "EPOW Reset", "Cooling warning", "Power warning", + "System shutdown", "System halt", "EPOW main enclosure", + "EPOW power off" }; + const char * battery_cyclestate[] = { "None", "In progress", + "Requested" }; + const char * battery_charging[] = { "Charging", "Discharging", + "No current flow" }; + const char * ibm_drconnector[] = { "Empty", "Present", "Unusable", + "Exchange" }; + + int have_strings = 0; + int num_states = 0; + int temperature = 0; + int unknown = 0; + + /* What kind of sensor do we have here? */ + + switch (s->token) { + case KEY_SWITCH: + seq_printf(m, "Key switch:\t"); + num_states = sizeof(key_switch) / sizeof(char *); + if (state < num_states) { + seq_printf(m, "%s\t", key_switch[state]); + have_strings = 1; + } + break; + case ENCLOSURE_SWITCH: + seq_printf(m, "Enclosure switch:\t"); + num_states = sizeof(enclosure_switch) / sizeof(char *); + if (state < num_states) { + seq_printf(m, "%s\t", + enclosure_switch[state]); + have_strings = 1; + } + break; + case THERMAL_SENSOR: + seq_printf(m, "Temp. (C/F):\t"); + temperature = 1; + break; + case LID_STATUS: + seq_printf(m, "Lid status:\t"); + num_states = sizeof(lid_status) / sizeof(char *); + if (state < num_states) { + seq_printf(m, "%s\t", lid_status[state]); + have_strings = 1; + } + break; + case POWER_SOURCE: + seq_printf(m, "Power source:\t"); + num_states = sizeof(power_source) / sizeof(char *); + if (state < num_states) { + seq_printf(m, "%s\t", + power_source[state]); + have_strings = 1; + } + break; + case BATTERY_VOLTAGE: + seq_printf(m, "Battery voltage:\t"); + break; + case BATTERY_REMAINING: + seq_printf(m, "Battery remaining:\t"); + num_states = sizeof(battery_remaining) / sizeof(char *); + if (state < num_states) + { + seq_printf(m, "%s\t", + battery_remaining[state]); + have_strings = 1; + } + break; + case BATTERY_PERCENTAGE: + seq_printf(m, "Battery percentage:\t"); + break; + case EPOW_SENSOR: + seq_printf(m, "EPOW Sensor:\t"); + num_states = sizeof(epow_sensor) / sizeof(char *); + if (state < num_states) { + seq_printf(m, "%s\t", epow_sensor[state]); + have_strings = 1; + } + break; + case BATTERY_CYCLESTATE: + seq_printf(m, "Battery cyclestate:\t"); + num_states = sizeof(battery_cyclestate) / + sizeof(char *); + if (state < num_states) { + seq_printf(m, "%s\t", + battery_cyclestate[state]); + have_strings = 1; + } + break; + case BATTERY_CHARGING: + seq_printf(m, "Battery Charging:\t"); + num_states = sizeof(battery_charging) / sizeof(char *); + if (state < num_states) { + seq_printf(m, "%s\t", + battery_charging[state]); + have_strings = 1; + } + break; + case IBM_SURVEILLANCE: + seq_printf(m, "Surveillance:\t"); + break; + case IBM_FANRPM: + seq_printf(m, "Fan (rpm):\t"); + break; + case IBM_VOLTAGE: + seq_printf(m, "Voltage (mv):\t"); + break; + case IBM_DRCONNECTOR: + seq_printf(m, "DR connector:\t"); + num_states = sizeof(ibm_drconnector) / sizeof(char *); + if (state < num_states) { + seq_printf(m, "%s\t", + ibm_drconnector[state]); + have_strings = 1; + } + break; + case IBM_POWERSUPPLY: + seq_printf(m, "Powersupply:\t"); + break; + default: + seq_printf(m, "Unknown sensor (type %d), ignoring it\n", + s->token); + unknown = 1; + have_strings = 1; + break; + } + if (have_strings == 0) { + if (temperature) { + seq_printf(m, "%4d /%4d\t", state, cel_to_fahr(state)); + } else + seq_printf(m, "%10d\t", state); + } + if (unknown == 0) { + seq_printf(m, "%s\t", ppc_rtas_process_error(error)); + get_location_code(m, s, loc); + } +} + +/* ****************************************************************** */ + +static void check_location(struct seq_file *m, const char *c) +{ + switch (c[0]) { + case LOC_PLANAR: + seq_printf(m, "Planar #%c", c[1]); + break; + case LOC_CPU: + seq_printf(m, "CPU #%c", c[1]); + break; + case LOC_FAN: + seq_printf(m, "Fan #%c", c[1]); + break; + case LOC_RACKMOUNTED: + seq_printf(m, "Rack #%c", c[1]); + break; + case LOC_VOLTAGE: + seq_printf(m, "Voltage #%c", c[1]); + break; + case LOC_LCD: + seq_printf(m, "LCD #%c", c[1]); + break; + case '.': + seq_printf(m, "- %c", c[1]); + break; + default: + seq_printf(m, "Unknown location"); + break; + } +} + + +/* ****************************************************************** */ +/* + * Format: + * ${LETTER}${NUMBER}[[-/]${LETTER}${NUMBER} [ ... ] ] + * the '.' may be an abbreviation + */ +static void check_location_string(struct seq_file *m, const char *c) +{ + while (*c) { + if (isalpha(*c) || *c == '.') + check_location(m, c); + else if (*c == '/' || *c == '-') + seq_printf(m, " at "); + c++; + } +} + + +/* ****************************************************************** */ + +static void get_location_code(struct seq_file *m, struct individual_sensor *s, + const char *loc) +{ + if (!loc || !*loc) { + seq_printf(m, "---");/* does not have a location */ + } else { + check_location_string(m, loc); + } + seq_putc(m, ' '); +} +/* ****************************************************************** */ +/* INDICATORS - Tone Frequency */ +/* ****************************************************************** */ +static ssize_t ppc_rtas_tone_freq_write(struct file *file, + const char __user *buf, size_t count, loff_t *ppos) +{ + u64 freq; + int error = parse_number(buf, count, &freq); + if (error) + return error; + + rtas_tone_frequency = freq; /* save it for later */ + error = rtas_call(rtas_token("set-indicator"), 3, 1, NULL, + TONE_FREQUENCY, 0, freq); + if (error) + printk(KERN_WARNING "error: setting tone frequency returned: %s\n", + ppc_rtas_process_error(error)); + return count; +} +/* ****************************************************************** */ +static int ppc_rtas_tone_freq_show(struct seq_file *m, void *v) +{ + seq_printf(m, "%lu\n", rtas_tone_frequency); + return 0; +} +/* ****************************************************************** */ +/* INDICATORS - Tone Volume */ +/* ****************************************************************** */ +static ssize_t ppc_rtas_tone_volume_write(struct file *file, + const char __user *buf, size_t count, loff_t *ppos) +{ + u64 volume; + int error = parse_number(buf, count, &volume); + if (error) + return error; + + if (volume > 100) + volume = 100; + + rtas_tone_volume = volume; /* save it for later */ + error = rtas_call(rtas_token("set-indicator"), 3, 1, NULL, + TONE_VOLUME, 0, volume); + if (error) + printk(KERN_WARNING "error: setting tone volume returned: %s\n", + ppc_rtas_process_error(error)); + return count; +} +/* ****************************************************************** */ +static int ppc_rtas_tone_volume_show(struct seq_file *m, void *v) +{ + seq_printf(m, "%lu\n", rtas_tone_volume); + return 0; +} + +/** + * ppc_rtas_rmo_buf_show() - Describe RTAS-addressable region for user space. + * + * Base + size description of a range of RTAS-addressable memory set + * aside for user space to use as work area(s) for certain RTAS + * functions. User space accesses this region via /dev/mem. Apart from + * security policies, the kernel does not arbitrate or serialize + * access to this region, and user space must ensure that concurrent + * users do not interfere with each other. + */ +static int ppc_rtas_rmo_buf_show(struct seq_file *m, void *v) +{ + seq_printf(m, "%016lx %x\n", rtas_rmo_buf, RTAS_USER_REGION_SIZE); + return 0; +} diff --git a/arch/powerpc/kernel/rtas-rtc.c b/arch/powerpc/kernel/rtas-rtc.c new file mode 100644 index 000000000..5a31d1829 --- /dev/null +++ b/arch/powerpc/kernel/rtas-rtc.c @@ -0,0 +1,112 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/kernel.h> +#include <linux/time.h> +#include <linux/timer.h> +#include <linux/init.h> +#include <linux/rtc.h> +#include <linux/delay.h> +#include <linux/ratelimit.h> +#include <asm/rtas.h> +#include <asm/time.h> + + +#define MAX_RTC_WAIT 5000 /* 5 sec */ + +time64_t __init rtas_get_boot_time(void) +{ + int ret[8]; + int error; + unsigned int wait_time; + u64 max_wait_tb; + + max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT; + do { + error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret); + + wait_time = rtas_busy_delay_time(error); + if (wait_time) { + /* This is boot time so we spin. */ + udelay(wait_time*1000); + } + } while (wait_time && (get_tb() < max_wait_tb)); + + if (error != 0) { + printk_ratelimited(KERN_WARNING + "error: reading the clock failed (%d)\n", + error); + return 0; + } + + return mktime64(ret[0], ret[1], ret[2], ret[3], ret[4], ret[5]); +} + +/* NOTE: get_rtc_time will get an error if executed in interrupt context + * and if a delay is needed to read the clock. In this case we just + * silently return without updating rtc_tm. + */ +void rtas_get_rtc_time(struct rtc_time *rtc_tm) +{ + int ret[8]; + int error; + unsigned int wait_time; + u64 max_wait_tb; + + max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT; + do { + error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret); + + wait_time = rtas_busy_delay_time(error); + if (wait_time) { + if (in_interrupt()) { + memset(rtc_tm, 0, sizeof(struct rtc_time)); + printk_ratelimited(KERN_WARNING + "error: reading clock " + "would delay interrupt\n"); + return; /* delay not allowed */ + } + msleep(wait_time); + } + } while (wait_time && (get_tb() < max_wait_tb)); + + if (error != 0) { + printk_ratelimited(KERN_WARNING + "error: reading the clock failed (%d)\n", + error); + return; + } + + rtc_tm->tm_sec = ret[5]; + rtc_tm->tm_min = ret[4]; + rtc_tm->tm_hour = ret[3]; + rtc_tm->tm_mday = ret[2]; + rtc_tm->tm_mon = ret[1] - 1; + rtc_tm->tm_year = ret[0] - 1900; +} + +int rtas_set_rtc_time(struct rtc_time *tm) +{ + int error, wait_time; + u64 max_wait_tb; + + max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT; + do { + error = rtas_call(rtas_token("set-time-of-day"), 7, 1, NULL, + tm->tm_year + 1900, tm->tm_mon + 1, + tm->tm_mday, tm->tm_hour, tm->tm_min, + tm->tm_sec, 0); + + wait_time = rtas_busy_delay_time(error); + if (wait_time) { + if (in_interrupt()) + return 1; /* probably decrementer */ + msleep(wait_time); + } + } while (wait_time && (get_tb() < max_wait_tb)); + + if (error != 0) + printk_ratelimited(KERN_WARNING + "error: setting the clock failed (%d)\n", + error); + + return 0; +} diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c new file mode 100644 index 000000000..f8d3caad4 --- /dev/null +++ b/arch/powerpc/kernel/rtas.c @@ -0,0 +1,1384 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * + * Procedures for interfacing to the RTAS on CHRP machines. + * + * Peter Bergner, IBM March 2001. + * Copyright (C) 2001 IBM. + */ + +#include <linux/stdarg.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/spinlock.h> +#include <linux/export.h> +#include <linux/init.h> +#include <linux/capability.h> +#include <linux/delay.h> +#include <linux/cpu.h> +#include <linux/sched.h> +#include <linux/smp.h> +#include <linux/completion.h> +#include <linux/cpumask.h> +#include <linux/memblock.h> +#include <linux/slab.h> +#include <linux/reboot.h> +#include <linux/security.h> +#include <linux/syscalls.h> +#include <linux/of.h> +#include <linux/of_fdt.h> + +#include <asm/interrupt.h> +#include <asm/rtas.h> +#include <asm/hvcall.h> +#include <asm/machdep.h> +#include <asm/firmware.h> +#include <asm/page.h> +#include <asm/param.h> +#include <asm/delay.h> +#include <linux/uaccess.h> +#include <asm/udbg.h> +#include <asm/syscalls.h> +#include <asm/smp.h> +#include <linux/atomic.h> +#include <asm/time.h> +#include <asm/mmu.h> +#include <asm/topology.h> + +/* This is here deliberately so it's only used in this file */ +void enter_rtas(unsigned long); + +static inline void do_enter_rtas(unsigned long args) +{ + unsigned long msr; + + /* + * Make sure MSR[RI] is currently enabled as it will be forced later + * in enter_rtas. + */ + msr = mfmsr(); + BUG_ON(!(msr & MSR_RI)); + + BUG_ON(!irqs_disabled()); + + hard_irq_disable(); /* Ensure MSR[EE] is disabled on PPC64 */ + + enter_rtas(args); + + srr_regs_clobbered(); /* rtas uses SRRs, invalidate */ +} + +struct rtas_t rtas = { + .lock = __ARCH_SPIN_LOCK_UNLOCKED +}; +EXPORT_SYMBOL(rtas); + +DEFINE_SPINLOCK(rtas_data_buf_lock); +EXPORT_SYMBOL(rtas_data_buf_lock); + +char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned; +EXPORT_SYMBOL(rtas_data_buf); + +unsigned long rtas_rmo_buf; + +/* + * If non-NULL, this gets called when the kernel terminates. + * This is done like this so rtas_flash can be a module. + */ +void (*rtas_flash_term_hook)(int); +EXPORT_SYMBOL(rtas_flash_term_hook); + +/* RTAS use home made raw locking instead of spin_lock_irqsave + * because those can be called from within really nasty contexts + * such as having the timebase stopped which would lockup with + * normal locks and spinlock debugging enabled + */ +static unsigned long lock_rtas(void) +{ + unsigned long flags; + + local_irq_save(flags); + preempt_disable(); + arch_spin_lock(&rtas.lock); + return flags; +} + +static void unlock_rtas(unsigned long flags) +{ + arch_spin_unlock(&rtas.lock); + local_irq_restore(flags); + preempt_enable(); +} + +/* + * call_rtas_display_status and call_rtas_display_status_delay + * are designed only for very early low-level debugging, which + * is why the token is hard-coded to 10. + */ +static void call_rtas_display_status(unsigned char c) +{ + unsigned long s; + + if (!rtas.base) + return; + + s = lock_rtas(); + rtas_call_unlocked(&rtas.args, 10, 1, 1, NULL, c); + unlock_rtas(s); +} + +static void call_rtas_display_status_delay(char c) +{ + static int pending_newline = 0; /* did last write end with unprinted newline? */ + static int width = 16; + + if (c == '\n') { + while (width-- > 0) + call_rtas_display_status(' '); + width = 16; + mdelay(500); + pending_newline = 1; + } else { + if (pending_newline) { + call_rtas_display_status('\r'); + call_rtas_display_status('\n'); + } + pending_newline = 0; + if (width--) { + call_rtas_display_status(c); + udelay(10000); + } + } +} + +void __init udbg_init_rtas_panel(void) +{ + udbg_putc = call_rtas_display_status_delay; +} + +#ifdef CONFIG_UDBG_RTAS_CONSOLE + +/* If you think you're dying before early_init_dt_scan_rtas() does its + * work, you can hard code the token values for your firmware here and + * hardcode rtas.base/entry etc. + */ +static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE; +static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE; + +static void udbg_rtascon_putc(char c) +{ + int tries; + + if (!rtas.base) + return; + + /* Add CRs before LFs */ + if (c == '\n') + udbg_rtascon_putc('\r'); + + /* if there is more than one character to be displayed, wait a bit */ + for (tries = 0; tries < 16; tries++) { + if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0) + break; + udelay(1000); + } +} + +static int udbg_rtascon_getc_poll(void) +{ + int c; + + if (!rtas.base) + return -1; + + if (rtas_call(rtas_getchar_token, 0, 2, &c)) + return -1; + + return c; +} + +static int udbg_rtascon_getc(void) +{ + int c; + + while ((c = udbg_rtascon_getc_poll()) == -1) + ; + + return c; +} + + +void __init udbg_init_rtas_console(void) +{ + udbg_putc = udbg_rtascon_putc; + udbg_getc = udbg_rtascon_getc; + udbg_getc_poll = udbg_rtascon_getc_poll; +} +#endif /* CONFIG_UDBG_RTAS_CONSOLE */ + +void rtas_progress(char *s, unsigned short hex) +{ + struct device_node *root; + int width; + const __be32 *p; + char *os; + static int display_character, set_indicator; + static int display_width, display_lines, form_feed; + static const int *row_width; + static DEFINE_SPINLOCK(progress_lock); + static int current_line; + static int pending_newline = 0; /* did last write end with unprinted newline? */ + + if (!rtas.base) + return; + + if (display_width == 0) { + display_width = 0x10; + if ((root = of_find_node_by_path("/rtas"))) { + if ((p = of_get_property(root, + "ibm,display-line-length", NULL))) + display_width = be32_to_cpu(*p); + if ((p = of_get_property(root, + "ibm,form-feed", NULL))) + form_feed = be32_to_cpu(*p); + if ((p = of_get_property(root, + "ibm,display-number-of-lines", NULL))) + display_lines = be32_to_cpu(*p); + row_width = of_get_property(root, + "ibm,display-truncation-length", NULL); + of_node_put(root); + } + display_character = rtas_token("display-character"); + set_indicator = rtas_token("set-indicator"); + } + + if (display_character == RTAS_UNKNOWN_SERVICE) { + /* use hex display if available */ + if (set_indicator != RTAS_UNKNOWN_SERVICE) + rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex); + return; + } + + spin_lock(&progress_lock); + + /* + * Last write ended with newline, but we didn't print it since + * it would just clear the bottom line of output. Print it now + * instead. + * + * If no newline is pending and form feed is supported, clear the + * display with a form feed; otherwise, print a CR to start output + * at the beginning of the line. + */ + if (pending_newline) { + rtas_call(display_character, 1, 1, NULL, '\r'); + rtas_call(display_character, 1, 1, NULL, '\n'); + pending_newline = 0; + } else { + current_line = 0; + if (form_feed) + rtas_call(display_character, 1, 1, NULL, + (char)form_feed); + else + rtas_call(display_character, 1, 1, NULL, '\r'); + } + + if (row_width) + width = row_width[current_line]; + else + width = display_width; + os = s; + while (*os) { + if (*os == '\n' || *os == '\r') { + /* If newline is the last character, save it + * until next call to avoid bumping up the + * display output. + */ + if (*os == '\n' && !os[1]) { + pending_newline = 1; + current_line++; + if (current_line > display_lines-1) + current_line = display_lines-1; + spin_unlock(&progress_lock); + return; + } + + /* RTAS wants CR-LF, not just LF */ + + if (*os == '\n') { + rtas_call(display_character, 1, 1, NULL, '\r'); + rtas_call(display_character, 1, 1, NULL, '\n'); + } else { + /* CR might be used to re-draw a line, so we'll + * leave it alone and not add LF. + */ + rtas_call(display_character, 1, 1, NULL, *os); + } + + if (row_width) + width = row_width[current_line]; + else + width = display_width; + } else { + width--; + rtas_call(display_character, 1, 1, NULL, *os); + } + + os++; + + /* if we overwrite the screen length */ + if (width <= 0) + while ((*os != 0) && (*os != '\n') && (*os != '\r')) + os++; + } + + spin_unlock(&progress_lock); +} +EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ + +int rtas_token(const char *service) +{ + const __be32 *tokp; + if (rtas.dev == NULL) + return RTAS_UNKNOWN_SERVICE; + tokp = of_get_property(rtas.dev, service, NULL); + return tokp ? be32_to_cpu(*tokp) : RTAS_UNKNOWN_SERVICE; +} +EXPORT_SYMBOL(rtas_token); + +int rtas_service_present(const char *service) +{ + return rtas_token(service) != RTAS_UNKNOWN_SERVICE; +} +EXPORT_SYMBOL(rtas_service_present); + +#ifdef CONFIG_RTAS_ERROR_LOGGING +/* + * Return the firmware-specified size of the error log buffer + * for all rtas calls that require an error buffer argument. + * This includes 'check-exception' and 'rtas-last-error'. + */ +int rtas_get_error_log_max(void) +{ + static int rtas_error_log_max; + if (rtas_error_log_max) + return rtas_error_log_max; + + rtas_error_log_max = rtas_token ("rtas-error-log-max"); + if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) || + (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) { + printk (KERN_WARNING "RTAS: bad log buffer size %d\n", + rtas_error_log_max); + rtas_error_log_max = RTAS_ERROR_LOG_MAX; + } + return rtas_error_log_max; +} +EXPORT_SYMBOL(rtas_get_error_log_max); + + +static char rtas_err_buf[RTAS_ERROR_LOG_MAX]; +static int rtas_last_error_token; + +/** Return a copy of the detailed error text associated with the + * most recent failed call to rtas. Because the error text + * might go stale if there are any other intervening rtas calls, + * this routine must be called atomically with whatever produced + * the error (i.e. with rtas.lock still held from the previous call). + */ +static char *__fetch_rtas_last_error(char *altbuf) +{ + struct rtas_args err_args, save_args; + u32 bufsz; + char *buf = NULL; + + if (rtas_last_error_token == -1) + return NULL; + + bufsz = rtas_get_error_log_max(); + + err_args.token = cpu_to_be32(rtas_last_error_token); + err_args.nargs = cpu_to_be32(2); + err_args.nret = cpu_to_be32(1); + err_args.args[0] = cpu_to_be32(__pa(rtas_err_buf)); + err_args.args[1] = cpu_to_be32(bufsz); + err_args.args[2] = 0; + + save_args = rtas.args; + rtas.args = err_args; + + do_enter_rtas(__pa(&rtas.args)); + + err_args = rtas.args; + rtas.args = save_args; + + /* Log the error in the unlikely case that there was one. */ + if (unlikely(err_args.args[2] == 0)) { + if (altbuf) { + buf = altbuf; + } else { + buf = rtas_err_buf; + if (slab_is_available()) + buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC); + } + if (buf) + memmove(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX); + } + + return buf; +} + +#define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL) + +#else /* CONFIG_RTAS_ERROR_LOGGING */ +#define __fetch_rtas_last_error(x) NULL +#define get_errorlog_buffer() NULL +#endif + + +static void +va_rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret, + va_list list) +{ + int i; + + args->token = cpu_to_be32(token); + args->nargs = cpu_to_be32(nargs); + args->nret = cpu_to_be32(nret); + args->rets = &(args->args[nargs]); + + for (i = 0; i < nargs; ++i) + args->args[i] = cpu_to_be32(va_arg(list, __u32)); + + for (i = 0; i < nret; ++i) + args->rets[i] = 0; + + do_enter_rtas(__pa(args)); +} + +void rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret, ...) +{ + va_list list; + + va_start(list, nret); + va_rtas_call_unlocked(args, token, nargs, nret, list); + va_end(list); +} + +static int ibm_open_errinjct_token; +static int ibm_errinjct_token; + +int rtas_call(int token, int nargs, int nret, int *outputs, ...) +{ + va_list list; + int i; + unsigned long s; + struct rtas_args *rtas_args; + char *buff_copy = NULL; + int ret; + + if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE) + return -1; + + if (token == ibm_open_errinjct_token || token == ibm_errinjct_token) { + /* + * It would be nicer to not discard the error value + * from security_locked_down(), but callers expect an + * RTAS status, not an errno. + */ + if (security_locked_down(LOCKDOWN_RTAS_ERROR_INJECTION)) + return -1; + } + + if ((mfmsr() & (MSR_IR|MSR_DR)) != (MSR_IR|MSR_DR)) { + WARN_ON_ONCE(1); + return -1; + } + + s = lock_rtas(); + + /* We use the global rtas args buffer */ + rtas_args = &rtas.args; + + va_start(list, outputs); + va_rtas_call_unlocked(rtas_args, token, nargs, nret, list); + va_end(list); + + /* A -1 return code indicates that the last command couldn't + be completed due to a hardware error. */ + if (be32_to_cpu(rtas_args->rets[0]) == -1) + buff_copy = __fetch_rtas_last_error(NULL); + + if (nret > 1 && outputs != NULL) + for (i = 0; i < nret-1; ++i) + outputs[i] = be32_to_cpu(rtas_args->rets[i+1]); + ret = (nret > 0)? be32_to_cpu(rtas_args->rets[0]): 0; + + unlock_rtas(s); + + if (buff_copy) { + log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); + if (slab_is_available()) + kfree(buff_copy); + } + return ret; +} +EXPORT_SYMBOL(rtas_call); + +/** + * rtas_busy_delay_time() - From an RTAS status value, calculate the + * suggested delay time in milliseconds. + * + * @status: a value returned from rtas_call() or similar APIs which return + * the status of a RTAS function call. + * + * Context: Any context. + * + * Return: + * * 100000 - If @status is 9905. + * * 10000 - If @status is 9904. + * * 1000 - If @status is 9903. + * * 100 - If @status is 9902. + * * 10 - If @status is 9901. + * * 1 - If @status is either 9900 or -2. This is "wrong" for -2, but + * some callers depend on this behavior, and the worst outcome + * is that they will delay for longer than necessary. + * * 0 - If @status is not a busy or extended delay value. + */ +unsigned int rtas_busy_delay_time(int status) +{ + int order; + unsigned int ms = 0; + + if (status == RTAS_BUSY) { + ms = 1; + } else if (status >= RTAS_EXTENDED_DELAY_MIN && + status <= RTAS_EXTENDED_DELAY_MAX) { + order = status - RTAS_EXTENDED_DELAY_MIN; + for (ms = 1; order > 0; order--) + ms *= 10; + } + + return ms; +} +EXPORT_SYMBOL(rtas_busy_delay_time); + +/** + * rtas_busy_delay() - helper for RTAS busy and extended delay statuses + * + * @status: a value returned from rtas_call() or similar APIs which return + * the status of a RTAS function call. + * + * Context: Process context. May sleep or schedule. + * + * Return: + * * true - @status is RTAS_BUSY or an extended delay hint. The + * caller may assume that the CPU has been yielded if necessary, + * and that an appropriate delay for @status has elapsed. + * Generally the caller should reattempt the RTAS call which + * yielded @status. + * + * * false - @status is not @RTAS_BUSY nor an extended delay hint. The + * caller is responsible for handling @status. + */ +bool rtas_busy_delay(int status) +{ + unsigned int ms; + bool ret; + + switch (status) { + case RTAS_EXTENDED_DELAY_MIN...RTAS_EXTENDED_DELAY_MAX: + ret = true; + ms = rtas_busy_delay_time(status); + /* + * The extended delay hint can be as high as 100 seconds. + * Surely any function returning such a status is either + * buggy or isn't going to be significantly slowed by us + * polling at 1HZ. Clamp the sleep time to one second. + */ + ms = clamp(ms, 1U, 1000U); + /* + * The delay hint is an order-of-magnitude suggestion, not + * a minimum. It is fine, possibly even advantageous, for + * us to pause for less time than hinted. For small values, + * use usleep_range() to ensure we don't sleep much longer + * than actually needed. + * + * See Documentation/timers/timers-howto.rst for + * explanation of the threshold used here. In effect we use + * usleep_range() for 9900 and 9901, msleep() for + * 9902-9905. + */ + if (ms <= 20) + usleep_range(ms * 100, ms * 1000); + else + msleep(ms); + break; + case RTAS_BUSY: + ret = true; + /* + * We should call again immediately if there's no other + * work to do. + */ + cond_resched(); + break; + default: + ret = false; + /* + * Not a busy or extended delay status; the caller should + * handle @status itself. Ensure we warn on misuses in + * atomic context regardless. + */ + might_sleep(); + break; + } + + return ret; +} +EXPORT_SYMBOL(rtas_busy_delay); + +static int rtas_error_rc(int rtas_rc) +{ + int rc; + + switch (rtas_rc) { + case -1: /* Hardware Error */ + rc = -EIO; + break; + case -3: /* Bad indicator/domain/etc */ + rc = -EINVAL; + break; + case -9000: /* Isolation error */ + rc = -EFAULT; + break; + case -9001: /* Outstanding TCE/PTE */ + rc = -EEXIST; + break; + case -9002: /* No usable slot */ + rc = -ENODEV; + break; + default: + printk(KERN_ERR "%s: unexpected RTAS error %d\n", + __func__, rtas_rc); + rc = -ERANGE; + break; + } + return rc; +} + +int rtas_get_power_level(int powerdomain, int *level) +{ + int token = rtas_token("get-power-level"); + int rc; + + if (token == RTAS_UNKNOWN_SERVICE) + return -ENOENT; + + while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY) + udelay(1); + + if (rc < 0) + return rtas_error_rc(rc); + return rc; +} +EXPORT_SYMBOL(rtas_get_power_level); + +int rtas_set_power_level(int powerdomain, int level, int *setlevel) +{ + int token = rtas_token("set-power-level"); + int rc; + + if (token == RTAS_UNKNOWN_SERVICE) + return -ENOENT; + + do { + rc = rtas_call(token, 2, 2, setlevel, powerdomain, level); + } while (rtas_busy_delay(rc)); + + if (rc < 0) + return rtas_error_rc(rc); + return rc; +} +EXPORT_SYMBOL(rtas_set_power_level); + +int rtas_get_sensor(int sensor, int index, int *state) +{ + int token = rtas_token("get-sensor-state"); + int rc; + + if (token == RTAS_UNKNOWN_SERVICE) + return -ENOENT; + + do { + rc = rtas_call(token, 2, 2, state, sensor, index); + } while (rtas_busy_delay(rc)); + + if (rc < 0) + return rtas_error_rc(rc); + return rc; +} +EXPORT_SYMBOL(rtas_get_sensor); + +int rtas_get_sensor_fast(int sensor, int index, int *state) +{ + int token = rtas_token("get-sensor-state"); + int rc; + + if (token == RTAS_UNKNOWN_SERVICE) + return -ENOENT; + + rc = rtas_call(token, 2, 2, state, sensor, index); + WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN && + rc <= RTAS_EXTENDED_DELAY_MAX)); + + if (rc < 0) + return rtas_error_rc(rc); + return rc; +} + +bool rtas_indicator_present(int token, int *maxindex) +{ + int proplen, count, i; + const struct indicator_elem { + __be32 token; + __be32 maxindex; + } *indicators; + + indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen); + if (!indicators) + return false; + + count = proplen / sizeof(struct indicator_elem); + + for (i = 0; i < count; i++) { + if (__be32_to_cpu(indicators[i].token) != token) + continue; + if (maxindex) + *maxindex = __be32_to_cpu(indicators[i].maxindex); + return true; + } + + return false; +} +EXPORT_SYMBOL(rtas_indicator_present); + +int rtas_set_indicator(int indicator, int index, int new_value) +{ + int token = rtas_token("set-indicator"); + int rc; + + if (token == RTAS_UNKNOWN_SERVICE) + return -ENOENT; + + do { + rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); + } while (rtas_busy_delay(rc)); + + if (rc < 0) + return rtas_error_rc(rc); + return rc; +} +EXPORT_SYMBOL(rtas_set_indicator); + +/* + * Ignoring RTAS extended delay + */ +int rtas_set_indicator_fast(int indicator, int index, int new_value) +{ + int rc; + int token = rtas_token("set-indicator"); + + if (token == RTAS_UNKNOWN_SERVICE) + return -ENOENT; + + rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); + + WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN && + rc <= RTAS_EXTENDED_DELAY_MAX)); + + if (rc < 0) + return rtas_error_rc(rc); + + return rc; +} + +/** + * rtas_ibm_suspend_me() - Call ibm,suspend-me to suspend the LPAR. + * + * @fw_status: RTAS call status will be placed here if not NULL. + * + * rtas_ibm_suspend_me() should be called only on a CPU which has + * received H_CONTINUE from the H_JOIN hcall. All other active CPUs + * should be waiting to return from H_JOIN. + * + * rtas_ibm_suspend_me() may suspend execution of the OS + * indefinitely. Callers should take appropriate measures upon return, such as + * resetting watchdog facilities. + * + * Callers may choose to retry this call if @fw_status is + * %RTAS_THREADS_ACTIVE. + * + * Return: + * 0 - The partition has resumed from suspend, possibly after + * migration to a different host. + * -ECANCELED - The operation was aborted. + * -EAGAIN - There were other CPUs not in H_JOIN at the time of the call. + * -EBUSY - Some other condition prevented the suspend from succeeding. + * -EIO - Hardware/platform error. + */ +int rtas_ibm_suspend_me(int *fw_status) +{ + int fwrc; + int ret; + + fwrc = rtas_call(rtas_token("ibm,suspend-me"), 0, 1, NULL); + + switch (fwrc) { + case 0: + ret = 0; + break; + case RTAS_SUSPEND_ABORTED: + ret = -ECANCELED; + break; + case RTAS_THREADS_ACTIVE: + ret = -EAGAIN; + break; + case RTAS_NOT_SUSPENDABLE: + case RTAS_OUTSTANDING_COPROC: + ret = -EBUSY; + break; + case -1: + default: + ret = -EIO; + break; + } + + if (fw_status) + *fw_status = fwrc; + + return ret; +} + +void __noreturn rtas_restart(char *cmd) +{ + if (rtas_flash_term_hook) + rtas_flash_term_hook(SYS_RESTART); + printk("RTAS system-reboot returned %d\n", + rtas_call(rtas_token("system-reboot"), 0, 1, NULL)); + for (;;); +} + +void rtas_power_off(void) +{ + if (rtas_flash_term_hook) + rtas_flash_term_hook(SYS_POWER_OFF); + /* allow power on only with power button press */ + printk("RTAS power-off returned %d\n", + rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); + for (;;); +} + +void __noreturn rtas_halt(void) +{ + if (rtas_flash_term_hook) + rtas_flash_term_hook(SYS_HALT); + /* allow power on only with power button press */ + printk("RTAS power-off returned %d\n", + rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); + for (;;); +} + +/* Must be in the RMO region, so we place it here */ +static char rtas_os_term_buf[2048]; +static s32 ibm_os_term_token = RTAS_UNKNOWN_SERVICE; + +void rtas_os_term(char *str) +{ + int status; + + /* + * Firmware with the ibm,extended-os-term property is guaranteed + * to always return from an ibm,os-term call. Earlier versions without + * this property may terminate the partition which we want to avoid + * since it interferes with panic_timeout. + */ + if (ibm_os_term_token == RTAS_UNKNOWN_SERVICE) + return; + + snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str); + + /* + * Keep calling as long as RTAS returns a "try again" status, + * but don't use rtas_busy_delay(), which potentially + * schedules. + */ + do { + status = rtas_call(ibm_os_term_token, 1, 1, NULL, + __pa(rtas_os_term_buf)); + } while (rtas_busy_delay_time(status)); + + if (status != 0) + printk(KERN_EMERG "ibm,os-term call failed %d\n", status); +} + +/** + * rtas_activate_firmware() - Activate a new version of firmware. + * + * Context: This function may sleep. + * + * Activate a new version of partition firmware. The OS must call this + * after resuming from a partition hibernation or migration in order + * to maintain the ability to perform live firmware updates. It's not + * catastrophic for this method to be absent or to fail; just log the + * condition in that case. + */ +void rtas_activate_firmware(void) +{ + int token; + int fwrc; + + token = rtas_token("ibm,activate-firmware"); + if (token == RTAS_UNKNOWN_SERVICE) { + pr_notice("ibm,activate-firmware method unavailable\n"); + return; + } + + do { + fwrc = rtas_call(token, 0, 1, NULL); + } while (rtas_busy_delay(fwrc)); + + if (fwrc) + pr_err("ibm,activate-firmware failed (%i)\n", fwrc); +} + +/** + * get_pseries_errorlog() - Find a specific pseries error log in an RTAS + * extended event log. + * @log: RTAS error/event log + * @section_id: two character section identifier + * + * Return: A pointer to the specified errorlog or NULL if not found. + */ +noinstr struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log, + uint16_t section_id) +{ + struct rtas_ext_event_log_v6 *ext_log = + (struct rtas_ext_event_log_v6 *)log->buffer; + struct pseries_errorlog *sect; + unsigned char *p, *log_end; + uint32_t ext_log_length = rtas_error_extended_log_length(log); + uint8_t log_format = rtas_ext_event_log_format(ext_log); + uint32_t company_id = rtas_ext_event_company_id(ext_log); + + /* Check that we understand the format */ + if (ext_log_length < sizeof(struct rtas_ext_event_log_v6) || + log_format != RTAS_V6EXT_LOG_FORMAT_EVENT_LOG || + company_id != RTAS_V6EXT_COMPANY_ID_IBM) + return NULL; + + log_end = log->buffer + ext_log_length; + p = ext_log->vendor_log; + + while (p < log_end) { + sect = (struct pseries_errorlog *)p; + if (pseries_errorlog_id(sect) == section_id) + return sect; + p += pseries_errorlog_length(sect); + } + + return NULL; +} + +#ifdef CONFIG_PPC_RTAS_FILTER + +/* + * The sys_rtas syscall, as originally designed, allows root to pass + * arbitrary physical addresses to RTAS calls. A number of RTAS calls + * can be abused to write to arbitrary memory and do other things that + * are potentially harmful to system integrity, and thus should only + * be used inside the kernel and not exposed to userspace. + * + * All known legitimate users of the sys_rtas syscall will only ever + * pass addresses that fall within the RMO buffer, and use a known + * subset of RTAS calls. + * + * Accordingly, we filter RTAS requests to check that the call is + * permitted, and that provided pointers fall within the RMO buffer. + * The rtas_filters list contains an entry for each permitted call, + * with the indexes of the parameters which are expected to contain + * addresses and sizes of buffers allocated inside the RMO buffer. + */ +struct rtas_filter { + const char *name; + int token; + /* Indexes into the args buffer, -1 if not used */ + int buf_idx1; + int size_idx1; + int buf_idx2; + int size_idx2; + + int fixed_size; +}; + +static struct rtas_filter rtas_filters[] __ro_after_init = { + { "ibm,activate-firmware", -1, -1, -1, -1, -1 }, + { "ibm,configure-connector", -1, 0, -1, 1, -1, 4096 }, /* Special cased */ + { "display-character", -1, -1, -1, -1, -1 }, + { "ibm,display-message", -1, 0, -1, -1, -1 }, + { "ibm,errinjct", -1, 2, -1, -1, -1, 1024 }, + { "ibm,close-errinjct", -1, -1, -1, -1, -1 }, + { "ibm,open-errinjct", -1, -1, -1, -1, -1 }, + { "ibm,get-config-addr-info2", -1, -1, -1, -1, -1 }, + { "ibm,get-dynamic-sensor-state", -1, 1, -1, -1, -1 }, + { "ibm,get-indices", -1, 2, 3, -1, -1 }, + { "get-power-level", -1, -1, -1, -1, -1 }, + { "get-sensor-state", -1, -1, -1, -1, -1 }, + { "ibm,get-system-parameter", -1, 1, 2, -1, -1 }, + { "get-time-of-day", -1, -1, -1, -1, -1 }, + { "ibm,get-vpd", -1, 0, -1, 1, 2 }, + { "ibm,lpar-perftools", -1, 2, 3, -1, -1 }, + { "ibm,platform-dump", -1, 4, 5, -1, -1 }, /* Special cased */ + { "ibm,read-slot-reset-state", -1, -1, -1, -1, -1 }, + { "ibm,scan-log-dump", -1, 0, 1, -1, -1 }, + { "ibm,set-dynamic-indicator", -1, 2, -1, -1, -1 }, + { "ibm,set-eeh-option", -1, -1, -1, -1, -1 }, + { "set-indicator", -1, -1, -1, -1, -1 }, + { "set-power-level", -1, -1, -1, -1, -1 }, + { "set-time-for-power-on", -1, -1, -1, -1, -1 }, + { "ibm,set-system-parameter", -1, 1, -1, -1, -1 }, + { "set-time-of-day", -1, -1, -1, -1, -1 }, +#ifdef CONFIG_CPU_BIG_ENDIAN + { "ibm,suspend-me", -1, -1, -1, -1, -1 }, + { "ibm,update-nodes", -1, 0, -1, -1, -1, 4096 }, + { "ibm,update-properties", -1, 0, -1, -1, -1, 4096 }, +#endif + { "ibm,physical-attestation", -1, 0, 1, -1, -1 }, +}; + +static bool in_rmo_buf(u32 base, u32 end) +{ + return base >= rtas_rmo_buf && + base < (rtas_rmo_buf + RTAS_USER_REGION_SIZE) && + base <= end && + end >= rtas_rmo_buf && + end < (rtas_rmo_buf + RTAS_USER_REGION_SIZE); +} + +static bool block_rtas_call(int token, int nargs, + struct rtas_args *args) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(rtas_filters); i++) { + struct rtas_filter *f = &rtas_filters[i]; + u32 base, size, end; + + if (token != f->token) + continue; + + if (f->buf_idx1 != -1) { + base = be32_to_cpu(args->args[f->buf_idx1]); + if (f->size_idx1 != -1) + size = be32_to_cpu(args->args[f->size_idx1]); + else if (f->fixed_size) + size = f->fixed_size; + else + size = 1; + + end = base + size - 1; + + /* + * Special case for ibm,platform-dump - NULL buffer + * address is used to indicate end of dump processing + */ + if (!strcmp(f->name, "ibm,platform-dump") && + base == 0) + return false; + + if (!in_rmo_buf(base, end)) + goto err; + } + + if (f->buf_idx2 != -1) { + base = be32_to_cpu(args->args[f->buf_idx2]); + if (f->size_idx2 != -1) + size = be32_to_cpu(args->args[f->size_idx2]); + else if (f->fixed_size) + size = f->fixed_size; + else + size = 1; + end = base + size - 1; + + /* + * Special case for ibm,configure-connector where the + * address can be 0 + */ + if (!strcmp(f->name, "ibm,configure-connector") && + base == 0) + return false; + + if (!in_rmo_buf(base, end)) + goto err; + } + + return false; + } + +err: + pr_err_ratelimited("sys_rtas: RTAS call blocked - exploit attempt?\n"); + pr_err_ratelimited("sys_rtas: token=0x%x, nargs=%d (called by %s)\n", + token, nargs, current->comm); + return true; +} + +static void __init rtas_syscall_filter_init(void) +{ + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(rtas_filters); i++) + rtas_filters[i].token = rtas_token(rtas_filters[i].name); +} + +#else + +static bool block_rtas_call(int token, int nargs, + struct rtas_args *args) +{ + return false; +} + +static void __init rtas_syscall_filter_init(void) +{ +} + +#endif /* CONFIG_PPC_RTAS_FILTER */ + +/* We assume to be passed big endian arguments */ +SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs) +{ + struct rtas_args args; + unsigned long flags; + char *buff_copy, *errbuf = NULL; + int nargs, nret, token; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (!rtas.entry) + return -EINVAL; + + if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0) + return -EFAULT; + + nargs = be32_to_cpu(args.nargs); + nret = be32_to_cpu(args.nret); + token = be32_to_cpu(args.token); + + if (nargs >= ARRAY_SIZE(args.args) + || nret > ARRAY_SIZE(args.args) + || nargs + nret > ARRAY_SIZE(args.args)) + return -EINVAL; + + /* Copy in args. */ + if (copy_from_user(args.args, uargs->args, + nargs * sizeof(rtas_arg_t)) != 0) + return -EFAULT; + + if (token == RTAS_UNKNOWN_SERVICE) + return -EINVAL; + + args.rets = &args.args[nargs]; + memset(args.rets, 0, nret * sizeof(rtas_arg_t)); + + if (block_rtas_call(token, nargs, &args)) + return -EINVAL; + + if (token == ibm_open_errinjct_token || token == ibm_errinjct_token) { + int err; + + err = security_locked_down(LOCKDOWN_RTAS_ERROR_INJECTION); + if (err) + return err; + } + + /* Need to handle ibm,suspend_me call specially */ + if (token == rtas_token("ibm,suspend-me")) { + + /* + * rtas_ibm_suspend_me assumes the streamid handle is in cpu + * endian, or at least the hcall within it requires it. + */ + int rc = 0; + u64 handle = ((u64)be32_to_cpu(args.args[0]) << 32) + | be32_to_cpu(args.args[1]); + rc = rtas_syscall_dispatch_ibm_suspend_me(handle); + if (rc == -EAGAIN) + args.rets[0] = cpu_to_be32(RTAS_NOT_SUSPENDABLE); + else if (rc == -EIO) + args.rets[0] = cpu_to_be32(-1); + else if (rc) + return rc; + goto copy_return; + } + + buff_copy = get_errorlog_buffer(); + + flags = lock_rtas(); + + rtas.args = args; + do_enter_rtas(__pa(&rtas.args)); + args = rtas.args; + + /* A -1 return code indicates that the last command couldn't + be completed due to a hardware error. */ + if (be32_to_cpu(args.rets[0]) == -1) + errbuf = __fetch_rtas_last_error(buff_copy); + + unlock_rtas(flags); + + if (buff_copy) { + if (errbuf) + log_error(errbuf, ERR_TYPE_RTAS_LOG, 0); + kfree(buff_copy); + } + + copy_return: + /* Copy out args. */ + if (copy_to_user(uargs->args + nargs, + args.args + nargs, + nret * sizeof(rtas_arg_t)) != 0) + return -EFAULT; + + return 0; +} + +/* + * Call early during boot, before mem init, to retrieve the RTAS + * information from the device-tree and allocate the RMO buffer for userland + * accesses. + */ +void __init rtas_initialize(void) +{ + unsigned long rtas_region = RTAS_INSTANTIATE_MAX; + u32 base, size, entry; + int no_base, no_size, no_entry; + + /* Get RTAS dev node and fill up our "rtas" structure with infos + * about it. + */ + rtas.dev = of_find_node_by_name(NULL, "rtas"); + if (!rtas.dev) + return; + + no_base = of_property_read_u32(rtas.dev, "linux,rtas-base", &base); + no_size = of_property_read_u32(rtas.dev, "rtas-size", &size); + if (no_base || no_size) { + of_node_put(rtas.dev); + rtas.dev = NULL; + return; + } + + rtas.base = base; + rtas.size = size; + no_entry = of_property_read_u32(rtas.dev, "linux,rtas-entry", &entry); + rtas.entry = no_entry ? rtas.base : entry; + + /* + * Discover these now to avoid device tree lookups in the + * panic path. + */ + if (of_property_read_bool(rtas.dev, "ibm,extended-os-term")) + ibm_os_term_token = rtas_token("ibm,os-term"); + + /* If RTAS was found, allocate the RMO buffer for it and look for + * the stop-self token if any + */ +#ifdef CONFIG_PPC64 + if (firmware_has_feature(FW_FEATURE_LPAR)) + rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX); +#endif + rtas_rmo_buf = memblock_phys_alloc_range(RTAS_USER_REGION_SIZE, PAGE_SIZE, + 0, rtas_region); + if (!rtas_rmo_buf) + panic("ERROR: RTAS: Failed to allocate %lx bytes below %pa\n", + PAGE_SIZE, &rtas_region); + +#ifdef CONFIG_RTAS_ERROR_LOGGING + rtas_last_error_token = rtas_token("rtas-last-error"); +#endif + ibm_open_errinjct_token = rtas_token("ibm,open-errinjct"); + ibm_errinjct_token = rtas_token("ibm,errinjct"); + rtas_syscall_filter_init(); +} + +int __init early_init_dt_scan_rtas(unsigned long node, + const char *uname, int depth, void *data) +{ + const u32 *basep, *entryp, *sizep; + + if (depth != 1 || strcmp(uname, "rtas") != 0) + return 0; + + basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL); + entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL); + sizep = of_get_flat_dt_prop(node, "rtas-size", NULL); + +#ifdef CONFIG_PPC64 + /* need this feature to decide the crashkernel offset */ + if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL)) + powerpc_firmware_features |= FW_FEATURE_LPAR; +#endif + + if (basep && entryp && sizep) { + rtas.base = *basep; + rtas.entry = *entryp; + rtas.size = *sizep; + } + +#ifdef CONFIG_UDBG_RTAS_CONSOLE + basep = of_get_flat_dt_prop(node, "put-term-char", NULL); + if (basep) + rtas_putchar_token = *basep; + + basep = of_get_flat_dt_prop(node, "get-term-char", NULL); + if (basep) + rtas_getchar_token = *basep; + + if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE && + rtas_getchar_token != RTAS_UNKNOWN_SERVICE) + udbg_init_rtas_console(); + +#endif + + /* break now */ + return 1; +} + +static arch_spinlock_t timebase_lock; +static u64 timebase = 0; + +void rtas_give_timebase(void) +{ + unsigned long flags; + + local_irq_save(flags); + hard_irq_disable(); + arch_spin_lock(&timebase_lock); + rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL); + timebase = get_tb(); + arch_spin_unlock(&timebase_lock); + + while (timebase) + barrier(); + rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL); + local_irq_restore(flags); +} + +void rtas_take_timebase(void) +{ + while (!timebase) + barrier(); + arch_spin_lock(&timebase_lock); + set_tb(timebase >> 32, timebase & 0xffffffff); + timebase = 0; + arch_spin_unlock(&timebase_lock); +} diff --git a/arch/powerpc/kernel/rtas_entry.S b/arch/powerpc/kernel/rtas_entry.S new file mode 100644 index 000000000..6ce95ddad --- /dev/null +++ b/arch/powerpc/kernel/rtas_entry.S @@ -0,0 +1,176 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#include <asm/asm-offsets.h> +#include <asm/bug.h> +#include <asm/page.h> +#include <asm/ppc_asm.h> + +/* + * RTAS is called with MSR IR, DR, EE disabled, and LR in the return address. + * + * Note: r3 is an input parameter to rtas, so don't trash it... + */ + +#ifdef CONFIG_PPC32 +_GLOBAL(enter_rtas) + stwu r1,-INT_FRAME_SIZE(r1) + mflr r0 + stw r0,INT_FRAME_SIZE+4(r1) + LOAD_REG_ADDR(r4, rtas) + lis r6,1f@ha /* physical return address for rtas */ + addi r6,r6,1f@l + tophys(r6,r6) + lwz r8,RTASENTRY(r4) + lwz r4,RTASBASE(r4) + mfmsr r9 + stw r9,8(r1) + li r9,MSR_KERNEL & ~(MSR_IR|MSR_DR) + mtlr r6 + stw r1, THREAD + RTAS_SP(r2) + mtspr SPRN_SRR0,r8 + mtspr SPRN_SRR1,r9 + rfi +1: + lis r8, 1f@h + ori r8, r8, 1f@l + LOAD_REG_IMMEDIATE(r9,MSR_KERNEL) + mtspr SPRN_SRR0,r8 + mtspr SPRN_SRR1,r9 + rfi /* Reactivate MMU translation */ +1: + lwz r8,INT_FRAME_SIZE+4(r1) /* get return address */ + lwz r9,8(r1) /* original msr value */ + addi r1,r1,INT_FRAME_SIZE + li r0,0 + stw r0, THREAD + RTAS_SP(r2) + mtlr r8 + mtmsr r9 + blr /* return to caller */ +_ASM_NOKPROBE_SYMBOL(enter_rtas) + +#else /* CONFIG_PPC32 */ +#include <asm/exception-64s.h> + +/* + * 32-bit rtas on 64-bit machines has the additional problem that RTAS may + * not preserve the upper parts of registers it uses. + */ +_GLOBAL(enter_rtas) + mflr r0 + std r0,16(r1) + stdu r1,-SWITCH_FRAME_SIZE(r1) /* Save SP and create stack space. */ + + /* Because RTAS is running in 32b mode, it clobbers the high order half + * of all registers that it saves. We therefore save those registers + * RTAS might touch to the stack. (r0, r3-r12 are caller saved) + */ + SAVE_GPR(2, r1) /* Save the TOC */ + SAVE_NVGPRS(r1) /* Save the non-volatiles */ + + mfcr r4 + std r4,_CCR(r1) + mfctr r5 + std r5,_CTR(r1) + mfspr r6,SPRN_XER + std r6,_XER(r1) + mfdar r7 + std r7,_DAR(r1) + mfdsisr r8 + std r8,_DSISR(r1) + + /* Temporary workaround to clear CR until RTAS can be modified to + * ignore all bits. + */ + li r0,0 + mtcr r0 + + mfmsr r6 + + /* Unfortunately, the stack pointer and the MSR are also clobbered, + * so they are saved in the PACA which allows us to restore + * our original state after RTAS returns. + */ + std r1,PACAR1(r13) + std r6,PACASAVEDMSR(r13) + + /* Setup our real return addr */ + LOAD_REG_ADDR(r4,rtas_return_loc) + clrldi r4,r4,2 /* convert to realmode address */ + mtlr r4 + +__enter_rtas: + LOAD_REG_ADDR(r4, rtas) + ld r5,RTASENTRY(r4) /* get the rtas->entry value */ + ld r4,RTASBASE(r4) /* get the rtas->base value */ + + /* + * RTAS runs in 32-bit big endian real mode, but leave MSR[RI] on as we + * may hit NMI (SRESET or MCE) while in RTAS. RTAS should disable RI in + * its critical regions (as specified in PAPR+ section 7.2.1). MSR[S] + * is not impacted by RFI_TO_KERNEL (only urfid can unset it). So if + * MSR[S] is set, it will remain when entering RTAS. + * If we're in HV mode, RTAS must also run in HV mode, so extract MSR_HV + * from the saved MSR value and insert into the value RTAS will use. + */ + extrdi r0, r6, 1, 63 - MSR_HV_LG + LOAD_REG_IMMEDIATE(r6, MSR_ME | MSR_RI) + insrdi r6, r0, 1, 63 - MSR_HV_LG + + li r0,0 + mtmsrd r0,1 /* disable RI before using SRR0/1 */ + + mtspr SPRN_SRR0,r5 + mtspr SPRN_SRR1,r6 + RFI_TO_KERNEL + b . /* prevent speculative execution */ +rtas_return_loc: + FIXUP_ENDIAN + + /* Set SF before anything. */ + LOAD_REG_IMMEDIATE(r6, MSR_KERNEL & ~(MSR_IR|MSR_DR)) + mtmsrd r6 + + /* relocation is off at this point */ + GET_PACA(r13) + + bcl 20,31,$+4 +0: mflr r3 + ld r3,(1f-0b)(r3) /* get &rtas_restore_regs */ + + ld r1,PACAR1(r13) /* Restore our SP */ + ld r4,PACASAVEDMSR(r13) /* Restore our MSR */ + + mtspr SPRN_SRR0,r3 + mtspr SPRN_SRR1,r4 + RFI_TO_KERNEL + b . /* prevent speculative execution */ +_ASM_NOKPROBE_SYMBOL(enter_rtas) +_ASM_NOKPROBE_SYMBOL(__enter_rtas) +_ASM_NOKPROBE_SYMBOL(rtas_return_loc) + + .align 3 +1: .8byte rtas_restore_regs + +rtas_restore_regs: + /* relocation is on at this point */ + REST_GPR(2, r1) /* Restore the TOC */ + REST_NVGPRS(r1) /* Restore the non-volatiles */ + + ld r4,_CCR(r1) + mtcr r4 + ld r5,_CTR(r1) + mtctr r5 + ld r6,_XER(r1) + mtspr SPRN_XER,r6 + ld r7,_DAR(r1) + mtdar r7 + ld r8,_DSISR(r1) + mtdsisr r8 + + addi r1,r1,SWITCH_FRAME_SIZE /* Unstack our frame */ + ld r0,16(r1) /* get return address */ + + mtlr r0 + blr /* return to caller */ + +#endif /* CONFIG_PPC32 */ diff --git a/arch/powerpc/kernel/rtas_flash.c b/arch/powerpc/kernel/rtas_flash.c new file mode 100644 index 000000000..43c635ddb --- /dev/null +++ b/arch/powerpc/kernel/rtas_flash.c @@ -0,0 +1,777 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * c 2001 PPC 64 Team, IBM Corp + * + * /proc/powerpc/rtas/firmware_flash interface + * + * This file implements a firmware_flash interface to pump a firmware + * image into the kernel. At reboot time rtas_restart() will see the + * firmware image and flash it as it reboots (see rtas.c). + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/proc_fs.h> +#include <linux/reboot.h> +#include <asm/delay.h> +#include <linux/uaccess.h> +#include <asm/rtas.h> + +#define MODULE_VERS "1.0" +#define MODULE_NAME "rtas_flash" + +#define FIRMWARE_FLASH_NAME "firmware_flash" +#define FIRMWARE_UPDATE_NAME "firmware_update" +#define MANAGE_FLASH_NAME "manage_flash" +#define VALIDATE_FLASH_NAME "validate_flash" + +/* General RTAS Status Codes */ +#define RTAS_RC_SUCCESS 0 +#define RTAS_RC_HW_ERR -1 +#define RTAS_RC_BUSY -2 + +/* Flash image status values */ +#define FLASH_AUTH -9002 /* RTAS Not Service Authority Partition */ +#define FLASH_NO_OP -1099 /* No operation initiated by user */ +#define FLASH_IMG_SHORT -1005 /* Flash image shorter than expected */ +#define FLASH_IMG_BAD_LEN -1004 /* Bad length value in flash list block */ +#define FLASH_IMG_NULL_DATA -1003 /* Bad data value in flash list block */ +#define FLASH_IMG_READY 0 /* Firmware img ready for flash on reboot */ + +/* Manage image status values */ +#define MANAGE_AUTH -9002 /* RTAS Not Service Authority Partition */ +#define MANAGE_ACTIVE_ERR -9001 /* RTAS Cannot Overwrite Active Img */ +#define MANAGE_NO_OP -1099 /* No operation initiated by user */ +#define MANAGE_PARAM_ERR -3 /* RTAS Parameter Error */ +#define MANAGE_HW_ERR -1 /* RTAS Hardware Error */ + +/* Validate image status values */ +#define VALIDATE_AUTH -9002 /* RTAS Not Service Authority Partition */ +#define VALIDATE_NO_OP -1099 /* No operation initiated by the user */ +#define VALIDATE_INCOMPLETE -1002 /* User copied < VALIDATE_BUF_SIZE */ +#define VALIDATE_READY -1001 /* Firmware image ready for validation */ +#define VALIDATE_PARAM_ERR -3 /* RTAS Parameter Error */ +#define VALIDATE_HW_ERR -1 /* RTAS Hardware Error */ + +/* ibm,validate-flash-image update result tokens */ +#define VALIDATE_TMP_UPDATE 0 /* T side will be updated */ +#define VALIDATE_FLASH_AUTH 1 /* Partition does not have authority */ +#define VALIDATE_INVALID_IMG 2 /* Candidate image is not valid */ +#define VALIDATE_CUR_UNKNOWN 3 /* Current fixpack level is unknown */ +/* + * Current T side will be committed to P side before being replace with new + * image, and the new image is downlevel from current image + */ +#define VALIDATE_TMP_COMMIT_DL 4 +/* + * Current T side will be committed to P side before being replaced with new + * image + */ +#define VALIDATE_TMP_COMMIT 5 +/* + * T side will be updated with a downlevel image + */ +#define VALIDATE_TMP_UPDATE_DL 6 +/* + * The candidate image's release date is later than the system's firmware + * service entitlement date - service warranty period has expired + */ +#define VALIDATE_OUT_OF_WRNTY 7 + +/* ibm,manage-flash-image operation tokens */ +#define RTAS_REJECT_TMP_IMG 0 +#define RTAS_COMMIT_TMP_IMG 1 + +/* Array sizes */ +#define VALIDATE_BUF_SIZE 4096 +#define VALIDATE_MSG_LEN 256 +#define RTAS_MSG_MAXLEN 64 + +/* Quirk - RTAS requires 4k list length and block size */ +#define RTAS_BLKLIST_LENGTH 4096 +#define RTAS_BLK_SIZE 4096 + +struct flash_block { + char *data; + unsigned long length; +}; + +/* This struct is very similar but not identical to + * that needed by the rtas flash update. + * All we need to do for rtas is rewrite num_blocks + * into a version/length and translate the pointers + * to absolute. + */ +#define FLASH_BLOCKS_PER_NODE ((RTAS_BLKLIST_LENGTH - 16) / sizeof(struct flash_block)) +struct flash_block_list { + unsigned long num_blocks; + struct flash_block_list *next; + struct flash_block blocks[FLASH_BLOCKS_PER_NODE]; +}; + +static struct flash_block_list *rtas_firmware_flash_list; + +/* Use slab cache to guarantee 4k alignment */ +static struct kmem_cache *flash_block_cache = NULL; + +#define FLASH_BLOCK_LIST_VERSION (1UL) + +/* + * Local copy of the flash block list. + * + * The rtas_firmware_flash_list variable will be + * set once the data is fully read. + * + * For convenience as we build the list we use virtual addrs, + * we do not fill in the version number, and the length field + * is treated as the number of entries currently in the block + * (i.e. not a byte count). This is all fixed when calling + * the flash routine. + */ + +/* Status int must be first member of struct */ +struct rtas_update_flash_t +{ + int status; /* Flash update status */ + struct flash_block_list *flist; /* Local copy of flash block list */ +}; + +/* Status int must be first member of struct */ +struct rtas_manage_flash_t +{ + int status; /* Returned status */ +}; + +/* Status int must be first member of struct */ +struct rtas_validate_flash_t +{ + int status; /* Returned status */ + char *buf; /* Candidate image buffer */ + unsigned int buf_size; /* Size of image buf */ + unsigned int update_results; /* Update results token */ +}; + +static struct rtas_update_flash_t rtas_update_flash_data; +static struct rtas_manage_flash_t rtas_manage_flash_data; +static struct rtas_validate_flash_t rtas_validate_flash_data; +static DEFINE_MUTEX(rtas_update_flash_mutex); +static DEFINE_MUTEX(rtas_manage_flash_mutex); +static DEFINE_MUTEX(rtas_validate_flash_mutex); + +/* Do simple sanity checks on the flash image. */ +static int flash_list_valid(struct flash_block_list *flist) +{ + struct flash_block_list *f; + int i; + unsigned long block_size, image_size; + + /* Paranoid self test here. We also collect the image size. */ + image_size = 0; + for (f = flist; f; f = f->next) { + for (i = 0; i < f->num_blocks; i++) { + if (f->blocks[i].data == NULL) { + return FLASH_IMG_NULL_DATA; + } + block_size = f->blocks[i].length; + if (block_size <= 0 || block_size > RTAS_BLK_SIZE) { + return FLASH_IMG_BAD_LEN; + } + image_size += block_size; + } + } + + if (image_size < (256 << 10)) { + if (image_size < 2) + return FLASH_NO_OP; + } + + printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size); + + return FLASH_IMG_READY; +} + +static void free_flash_list(struct flash_block_list *f) +{ + struct flash_block_list *next; + int i; + + while (f) { + for (i = 0; i < f->num_blocks; i++) + kmem_cache_free(flash_block_cache, f->blocks[i].data); + next = f->next; + kmem_cache_free(flash_block_cache, f); + f = next; + } +} + +static int rtas_flash_release(struct inode *inode, struct file *file) +{ + struct rtas_update_flash_t *const uf = &rtas_update_flash_data; + + mutex_lock(&rtas_update_flash_mutex); + + if (uf->flist) { + /* File was opened in write mode for a new flash attempt */ + /* Clear saved list */ + if (rtas_firmware_flash_list) { + free_flash_list(rtas_firmware_flash_list); + rtas_firmware_flash_list = NULL; + } + + if (uf->status != FLASH_AUTH) + uf->status = flash_list_valid(uf->flist); + + if (uf->status == FLASH_IMG_READY) + rtas_firmware_flash_list = uf->flist; + else + free_flash_list(uf->flist); + + uf->flist = NULL; + } + + mutex_unlock(&rtas_update_flash_mutex); + return 0; +} + +static size_t get_flash_status_msg(int status, char *buf) +{ + const char *msg; + size_t len; + + switch (status) { + case FLASH_AUTH: + msg = "error: this partition does not have service authority\n"; + break; + case FLASH_NO_OP: + msg = "info: no firmware image for flash\n"; + break; + case FLASH_IMG_SHORT: + msg = "error: flash image short\n"; + break; + case FLASH_IMG_BAD_LEN: + msg = "error: internal error bad length\n"; + break; + case FLASH_IMG_NULL_DATA: + msg = "error: internal error null data\n"; + break; + case FLASH_IMG_READY: + msg = "ready: firmware image ready for flash on reboot\n"; + break; + default: + return sprintf(buf, "error: unexpected status value %d\n", + status); + } + + len = strlen(msg); + memcpy(buf, msg, len + 1); + return len; +} + +/* Reading the proc file will show status (not the firmware contents) */ +static ssize_t rtas_flash_read_msg(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + struct rtas_update_flash_t *const uf = &rtas_update_flash_data; + char msg[RTAS_MSG_MAXLEN]; + size_t len; + int status; + + mutex_lock(&rtas_update_flash_mutex); + status = uf->status; + mutex_unlock(&rtas_update_flash_mutex); + + /* Read as text message */ + len = get_flash_status_msg(status, msg); + return simple_read_from_buffer(buf, count, ppos, msg, len); +} + +static ssize_t rtas_flash_read_num(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + struct rtas_update_flash_t *const uf = &rtas_update_flash_data; + char msg[RTAS_MSG_MAXLEN]; + int status; + + mutex_lock(&rtas_update_flash_mutex); + status = uf->status; + mutex_unlock(&rtas_update_flash_mutex); + + /* Read as number */ + sprintf(msg, "%d\n", status); + return simple_read_from_buffer(buf, count, ppos, msg, strlen(msg)); +} + +/* We could be much more efficient here. But to keep this function + * simple we allocate a page to the block list no matter how small the + * count is. If the system is low on memory it will be just as well + * that we fail.... + */ +static ssize_t rtas_flash_write(struct file *file, const char __user *buffer, + size_t count, loff_t *off) +{ + struct rtas_update_flash_t *const uf = &rtas_update_flash_data; + char *p; + int next_free, rc; + struct flash_block_list *fl; + + mutex_lock(&rtas_update_flash_mutex); + + if (uf->status == FLASH_AUTH || count == 0) + goto out; /* discard data */ + + /* In the case that the image is not ready for flashing, the memory + * allocated for the block list will be freed upon the release of the + * proc file + */ + if (uf->flist == NULL) { + uf->flist = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL); + if (!uf->flist) + goto nomem; + } + + fl = uf->flist; + while (fl->next) + fl = fl->next; /* seek to last block_list for append */ + next_free = fl->num_blocks; + if (next_free == FLASH_BLOCKS_PER_NODE) { + /* Need to allocate another block_list */ + fl->next = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL); + if (!fl->next) + goto nomem; + fl = fl->next; + next_free = 0; + } + + if (count > RTAS_BLK_SIZE) + count = RTAS_BLK_SIZE; + p = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL); + if (!p) + goto nomem; + + if(copy_from_user(p, buffer, count)) { + kmem_cache_free(flash_block_cache, p); + rc = -EFAULT; + goto error; + } + fl->blocks[next_free].data = p; + fl->blocks[next_free].length = count; + fl->num_blocks++; +out: + mutex_unlock(&rtas_update_flash_mutex); + return count; + +nomem: + rc = -ENOMEM; +error: + mutex_unlock(&rtas_update_flash_mutex); + return rc; +} + +/* + * Flash management routines. + */ +static void manage_flash(struct rtas_manage_flash_t *args_buf, unsigned int op) +{ + s32 rc; + + do { + rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1, 1, + NULL, op); + } while (rtas_busy_delay(rc)); + + args_buf->status = rc; +} + +static ssize_t manage_flash_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data; + char msg[RTAS_MSG_MAXLEN]; + int msglen, status; + + mutex_lock(&rtas_manage_flash_mutex); + status = args_buf->status; + mutex_unlock(&rtas_manage_flash_mutex); + + msglen = sprintf(msg, "%d\n", status); + return simple_read_from_buffer(buf, count, ppos, msg, msglen); +} + +static ssize_t manage_flash_write(struct file *file, const char __user *buf, + size_t count, loff_t *off) +{ + struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data; + static const char reject_str[] = "0"; + static const char commit_str[] = "1"; + char stkbuf[10]; + int op, rc; + + mutex_lock(&rtas_manage_flash_mutex); + + if ((args_buf->status == MANAGE_AUTH) || (count == 0)) + goto out; + + op = -1; + if (buf) { + if (count > 9) count = 9; + rc = -EFAULT; + if (copy_from_user (stkbuf, buf, count)) + goto error; + if (strncmp(stkbuf, reject_str, strlen(reject_str)) == 0) + op = RTAS_REJECT_TMP_IMG; + else if (strncmp(stkbuf, commit_str, strlen(commit_str)) == 0) + op = RTAS_COMMIT_TMP_IMG; + } + + if (op == -1) { /* buf is empty, or contains invalid string */ + rc = -EINVAL; + goto error; + } + + manage_flash(args_buf, op); +out: + mutex_unlock(&rtas_manage_flash_mutex); + return count; + +error: + mutex_unlock(&rtas_manage_flash_mutex); + return rc; +} + +/* + * Validation routines. + */ +static void validate_flash(struct rtas_validate_flash_t *args_buf) +{ + int token = rtas_token("ibm,validate-flash-image"); + int update_results; + s32 rc; + + rc = 0; + do { + spin_lock(&rtas_data_buf_lock); + memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE); + rc = rtas_call(token, 2, 2, &update_results, + (u32) __pa(rtas_data_buf), args_buf->buf_size); + memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE); + spin_unlock(&rtas_data_buf_lock); + } while (rtas_busy_delay(rc)); + + args_buf->status = rc; + args_buf->update_results = update_results; +} + +static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf, + char *msg, int msglen) +{ + int n; + + if (args_buf->status >= VALIDATE_TMP_UPDATE) { + n = sprintf(msg, "%d\n", args_buf->update_results); + if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) || + (args_buf->update_results == VALIDATE_TMP_UPDATE)) + n += snprintf(msg + n, msglen - n, "%s\n", + args_buf->buf); + } else { + n = sprintf(msg, "%d\n", args_buf->status); + } + return n; +} + +static ssize_t validate_flash_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + struct rtas_validate_flash_t *const args_buf = + &rtas_validate_flash_data; + char msg[VALIDATE_MSG_LEN]; + int msglen; + + mutex_lock(&rtas_validate_flash_mutex); + msglen = get_validate_flash_msg(args_buf, msg, VALIDATE_MSG_LEN); + mutex_unlock(&rtas_validate_flash_mutex); + + return simple_read_from_buffer(buf, count, ppos, msg, msglen); +} + +static ssize_t validate_flash_write(struct file *file, const char __user *buf, + size_t count, loff_t *off) +{ + struct rtas_validate_flash_t *const args_buf = + &rtas_validate_flash_data; + int rc; + + mutex_lock(&rtas_validate_flash_mutex); + + /* We are only interested in the first 4K of the + * candidate image */ + if ((*off >= VALIDATE_BUF_SIZE) || + (args_buf->status == VALIDATE_AUTH)) { + *off += count; + mutex_unlock(&rtas_validate_flash_mutex); + return count; + } + + if (*off + count >= VALIDATE_BUF_SIZE) { + count = VALIDATE_BUF_SIZE - *off; + args_buf->status = VALIDATE_READY; + } else { + args_buf->status = VALIDATE_INCOMPLETE; + } + + if (!access_ok(buf, count)) { + rc = -EFAULT; + goto done; + } + if (copy_from_user(args_buf->buf + *off, buf, count)) { + rc = -EFAULT; + goto done; + } + + *off += count; + rc = count; +done: + mutex_unlock(&rtas_validate_flash_mutex); + return rc; +} + +static int validate_flash_release(struct inode *inode, struct file *file) +{ + struct rtas_validate_flash_t *const args_buf = + &rtas_validate_flash_data; + + mutex_lock(&rtas_validate_flash_mutex); + + if (args_buf->status == VALIDATE_READY) { + args_buf->buf_size = VALIDATE_BUF_SIZE; + validate_flash(args_buf); + } + + mutex_unlock(&rtas_validate_flash_mutex); + return 0; +} + +/* + * On-reboot flash update applicator. + */ +static void rtas_flash_firmware(int reboot_type) +{ + unsigned long image_size; + struct flash_block_list *f, *next, *flist; + unsigned long rtas_block_list; + int i, status, update_token; + + if (rtas_firmware_flash_list == NULL) + return; /* nothing to do */ + + if (reboot_type != SYS_RESTART) { + printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n"); + printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n"); + return; + } + + update_token = rtas_token("ibm,update-flash-64-and-reboot"); + if (update_token == RTAS_UNKNOWN_SERVICE) { + printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot " + "is not available -- not a service partition?\n"); + printk(KERN_ALERT "FLASH: firmware will not be flashed\n"); + return; + } + + /* + * Just before starting the firmware flash, cancel the event scan work + * to avoid any soft lockup issues. + */ + rtas_cancel_event_scan(); + + /* + * NOTE: the "first" block must be under 4GB, so we create + * an entry with no data blocks in the reserved buffer in + * the kernel data segment. + */ + spin_lock(&rtas_data_buf_lock); + flist = (struct flash_block_list *)&rtas_data_buf[0]; + flist->num_blocks = 0; + flist->next = rtas_firmware_flash_list; + rtas_block_list = __pa(flist); + if (rtas_block_list >= 4UL*1024*1024*1024) { + printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n"); + spin_unlock(&rtas_data_buf_lock); + return; + } + + printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n"); + /* Update the block_list in place. */ + rtas_firmware_flash_list = NULL; /* too hard to backout on error */ + image_size = 0; + for (f = flist; f; f = next) { + /* Translate data addrs to absolute */ + for (i = 0; i < f->num_blocks; i++) { + f->blocks[i].data = (char *)cpu_to_be64(__pa(f->blocks[i].data)); + image_size += f->blocks[i].length; + f->blocks[i].length = cpu_to_be64(f->blocks[i].length); + } + next = f->next; + /* Don't translate NULL pointer for last entry */ + if (f->next) + f->next = (struct flash_block_list *)cpu_to_be64(__pa(f->next)); + else + f->next = NULL; + /* make num_blocks into the version/length field */ + f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16); + f->num_blocks = cpu_to_be64(f->num_blocks); + } + + printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size); + printk(KERN_ALERT "FLASH: performing flash and reboot\n"); + rtas_progress("Flashing \n", 0x0); + rtas_progress("Please Wait... ", 0x0); + printk(KERN_ALERT "FLASH: this will take several minutes. Do not power off!\n"); + status = rtas_call(update_token, 1, 1, NULL, rtas_block_list); + switch (status) { /* should only get "bad" status */ + case 0: + printk(KERN_ALERT "FLASH: success\n"); + break; + case -1: + printk(KERN_ALERT "FLASH: hardware error. Firmware may not be not flashed\n"); + break; + case -3: + printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform. Firmware not flashed\n"); + break; + case -4: + printk(KERN_ALERT "FLASH: flash failed when partially complete. System may not reboot\n"); + break; + default: + printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status); + break; + } + spin_unlock(&rtas_data_buf_lock); +} + +/* + * Manifest of proc files to create + */ +struct rtas_flash_file { + const char *filename; + const char *rtas_call_name; + int *status; + const struct proc_ops ops; +}; + +static const struct rtas_flash_file rtas_flash_files[] = { + { + .filename = "powerpc/rtas/" FIRMWARE_FLASH_NAME, + .rtas_call_name = "ibm,update-flash-64-and-reboot", + .status = &rtas_update_flash_data.status, + .ops.proc_read = rtas_flash_read_msg, + .ops.proc_write = rtas_flash_write, + .ops.proc_release = rtas_flash_release, + .ops.proc_lseek = default_llseek, + }, + { + .filename = "powerpc/rtas/" FIRMWARE_UPDATE_NAME, + .rtas_call_name = "ibm,update-flash-64-and-reboot", + .status = &rtas_update_flash_data.status, + .ops.proc_read = rtas_flash_read_num, + .ops.proc_write = rtas_flash_write, + .ops.proc_release = rtas_flash_release, + .ops.proc_lseek = default_llseek, + }, + { + .filename = "powerpc/rtas/" VALIDATE_FLASH_NAME, + .rtas_call_name = "ibm,validate-flash-image", + .status = &rtas_validate_flash_data.status, + .ops.proc_read = validate_flash_read, + .ops.proc_write = validate_flash_write, + .ops.proc_release = validate_flash_release, + .ops.proc_lseek = default_llseek, + }, + { + .filename = "powerpc/rtas/" MANAGE_FLASH_NAME, + .rtas_call_name = "ibm,manage-flash-image", + .status = &rtas_manage_flash_data.status, + .ops.proc_read = manage_flash_read, + .ops.proc_write = manage_flash_write, + .ops.proc_lseek = default_llseek, + } +}; + +static int __init rtas_flash_init(void) +{ + int i; + + if (rtas_token("ibm,update-flash-64-and-reboot") == + RTAS_UNKNOWN_SERVICE) { + pr_info("rtas_flash: no firmware flash support\n"); + return -EINVAL; + } + + rtas_validate_flash_data.buf = kzalloc(VALIDATE_BUF_SIZE, GFP_KERNEL); + if (!rtas_validate_flash_data.buf) + return -ENOMEM; + + flash_block_cache = kmem_cache_create_usercopy("rtas_flash_cache", + RTAS_BLK_SIZE, RTAS_BLK_SIZE, + 0, 0, RTAS_BLK_SIZE, NULL); + if (!flash_block_cache) { + printk(KERN_ERR "%s: failed to create block cache\n", + __func__); + goto enomem_buf; + } + + for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) { + const struct rtas_flash_file *f = &rtas_flash_files[i]; + int token; + + if (!proc_create(f->filename, 0600, NULL, &f->ops)) + goto enomem; + + /* + * This code assumes that the status int is the first member of the + * struct + */ + token = rtas_token(f->rtas_call_name); + if (token == RTAS_UNKNOWN_SERVICE) + *f->status = FLASH_AUTH; + else + *f->status = FLASH_NO_OP; + } + + rtas_flash_term_hook = rtas_flash_firmware; + return 0; + +enomem: + while (--i >= 0) { + const struct rtas_flash_file *f = &rtas_flash_files[i]; + remove_proc_entry(f->filename, NULL); + } + + kmem_cache_destroy(flash_block_cache); +enomem_buf: + kfree(rtas_validate_flash_data.buf); + return -ENOMEM; +} + +static void __exit rtas_flash_cleanup(void) +{ + int i; + + rtas_flash_term_hook = NULL; + + if (rtas_firmware_flash_list) { + free_flash_list(rtas_firmware_flash_list); + rtas_firmware_flash_list = NULL; + } + + for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) { + const struct rtas_flash_file *f = &rtas_flash_files[i]; + remove_proc_entry(f->filename, NULL); + } + + kmem_cache_destroy(flash_block_cache); + kfree(rtas_validate_flash_data.buf); +} + +module_init(rtas_flash_init); +module_exit(rtas_flash_cleanup); +MODULE_LICENSE("GPL"); diff --git a/arch/powerpc/kernel/rtas_pci.c b/arch/powerpc/kernel/rtas_pci.c new file mode 100644 index 000000000..5a2f5ea3b --- /dev/null +++ b/arch/powerpc/kernel/rtas_pci.c @@ -0,0 +1,242 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2001 Dave Engebretsen, IBM Corporation + * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM + * + * RTAS specific routines for PCI. + * + * Based on code from pci.c, chrp_pci.c and pSeries_pci.c + */ + +#include <linux/kernel.h> +#include <linux/threads.h> +#include <linux/pci.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/pgtable.h> +#include <linux/of_address.h> +#include <linux/of_fdt.h> + +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/machdep.h> +#include <asm/pci-bridge.h> +#include <asm/iommu.h> +#include <asm/rtas.h> +#include <asm/mpic.h> +#include <asm/ppc-pci.h> +#include <asm/eeh.h> + +/* RTAS tokens */ +static int read_pci_config; +static int write_pci_config; +static int ibm_read_pci_config; +static int ibm_write_pci_config; + +static inline int config_access_valid(struct pci_dn *dn, int where) +{ + if (where < 256) + return 1; + if (where < 4096 && dn->pci_ext_config_space) + return 1; + + return 0; +} + +int rtas_read_config(struct pci_dn *pdn, int where, int size, u32 *val) +{ + int returnval = -1; + unsigned long buid, addr; + int ret; + + if (!pdn) + return PCIBIOS_DEVICE_NOT_FOUND; + if (!config_access_valid(pdn, where)) + return PCIBIOS_BAD_REGISTER_NUMBER; +#ifdef CONFIG_EEH + if (pdn->edev && pdn->edev->pe && + (pdn->edev->pe->state & EEH_PE_CFG_BLOCKED)) + return PCIBIOS_SET_FAILED; +#endif + + addr = rtas_config_addr(pdn->busno, pdn->devfn, where); + buid = pdn->phb->buid; + if (buid) { + ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval, + addr, BUID_HI(buid), BUID_LO(buid), size); + } else { + ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size); + } + *val = returnval; + + if (ret) + return PCIBIOS_DEVICE_NOT_FOUND; + + return PCIBIOS_SUCCESSFUL; +} + +static int rtas_pci_read_config(struct pci_bus *bus, + unsigned int devfn, + int where, int size, u32 *val) +{ + struct pci_dn *pdn; + int ret; + + *val = 0xFFFFFFFF; + + pdn = pci_get_pdn_by_devfn(bus, devfn); + + /* Validity of pdn is checked in here */ + ret = rtas_read_config(pdn, where, size, val); + if (*val == EEH_IO_ERROR_VALUE(size) && + eeh_dev_check_failure(pdn_to_eeh_dev(pdn))) + return PCIBIOS_DEVICE_NOT_FOUND; + + return ret; +} + +int rtas_write_config(struct pci_dn *pdn, int where, int size, u32 val) +{ + unsigned long buid, addr; + int ret; + + if (!pdn) + return PCIBIOS_DEVICE_NOT_FOUND; + if (!config_access_valid(pdn, where)) + return PCIBIOS_BAD_REGISTER_NUMBER; +#ifdef CONFIG_EEH + if (pdn->edev && pdn->edev->pe && + (pdn->edev->pe->state & EEH_PE_CFG_BLOCKED)) + return PCIBIOS_SET_FAILED; +#endif + + addr = rtas_config_addr(pdn->busno, pdn->devfn, where); + buid = pdn->phb->buid; + if (buid) { + ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr, + BUID_HI(buid), BUID_LO(buid), size, (ulong) val); + } else { + ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val); + } + + if (ret) + return PCIBIOS_DEVICE_NOT_FOUND; + + return PCIBIOS_SUCCESSFUL; +} + +static int rtas_pci_write_config(struct pci_bus *bus, + unsigned int devfn, + int where, int size, u32 val) +{ + struct pci_dn *pdn; + + pdn = pci_get_pdn_by_devfn(bus, devfn); + + /* Validity of pdn is checked in here. */ + return rtas_write_config(pdn, where, size, val); +} + +static struct pci_ops rtas_pci_ops = { + .read = rtas_pci_read_config, + .write = rtas_pci_write_config, +}; + +static int is_python(struct device_node *dev) +{ + const char *model = of_get_property(dev, "model", NULL); + + if (model && strstr(model, "Python")) + return 1; + + return 0; +} + +static void python_countermeasures(struct device_node *dev) +{ + struct resource registers; + void __iomem *chip_regs; + volatile u32 val; + + if (of_address_to_resource(dev, 0, ®isters)) { + printk(KERN_ERR "Can't get address for Python workarounds !\n"); + return; + } + + /* Python's register file is 1 MB in size. */ + chip_regs = ioremap(registers.start & ~(0xfffffUL), 0x100000); + + /* + * Firmware doesn't always clear this bit which is critical + * for good performance - Anton + */ + +#define PRG_CL_RESET_VALID 0x00010000 + + val = in_be32(chip_regs + 0xf6030); + if (val & PRG_CL_RESET_VALID) { + printk(KERN_INFO "Python workaround: "); + val &= ~PRG_CL_RESET_VALID; + out_be32(chip_regs + 0xf6030, val); + /* + * We must read it back for changes to + * take effect + */ + val = in_be32(chip_regs + 0xf6030); + printk("reg0: %x\n", val); + } + + iounmap(chip_regs); +} + +void __init init_pci_config_tokens(void) +{ + read_pci_config = rtas_token("read-pci-config"); + write_pci_config = rtas_token("write-pci-config"); + ibm_read_pci_config = rtas_token("ibm,read-pci-config"); + ibm_write_pci_config = rtas_token("ibm,write-pci-config"); +} + +unsigned long get_phb_buid(struct device_node *phb) +{ + struct resource r; + + if (ibm_read_pci_config == -1) + return 0; + if (of_address_to_resource(phb, 0, &r)) + return 0; + return r.start; +} + +static int phb_set_bus_ranges(struct device_node *dev, + struct pci_controller *phb) +{ + const __be32 *bus_range; + unsigned int len; + + bus_range = of_get_property(dev, "bus-range", &len); + if (bus_range == NULL || len < 2 * sizeof(int)) { + return 1; + } + + phb->first_busno = be32_to_cpu(bus_range[0]); + phb->last_busno = be32_to_cpu(bus_range[1]); + + return 0; +} + +int rtas_setup_phb(struct pci_controller *phb) +{ + struct device_node *dev = phb->dn; + + if (is_python(dev)) + python_countermeasures(dev); + + if (phb_set_bus_ranges(dev, phb)) + return 1; + + phb->ops = &rtas_pci_ops; + phb->buid = get_phb_buid(dev); + + return 0; +} diff --git a/arch/powerpc/kernel/rtasd.c b/arch/powerpc/kernel/rtasd.c new file mode 100644 index 000000000..5270b450b --- /dev/null +++ b/arch/powerpc/kernel/rtasd.c @@ -0,0 +1,581 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM + * + * Communication to userspace based on kernel/printk.c + */ + +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/poll.h> +#include <linux/proc_fs.h> +#include <linux/init.h> +#include <linux/vmalloc.h> +#include <linux/spinlock.h> +#include <linux/cpu.h> +#include <linux/workqueue.h> +#include <linux/slab.h> +#include <linux/topology.h> + +#include <linux/uaccess.h> +#include <asm/io.h> +#include <asm/rtas.h> +#include <asm/nvram.h> +#include <linux/atomic.h> +#include <asm/machdep.h> +#include <asm/topology.h> + + +static DEFINE_SPINLOCK(rtasd_log_lock); + +static DECLARE_WAIT_QUEUE_HEAD(rtas_log_wait); + +static char *rtas_log_buf; +static unsigned long rtas_log_start; +static unsigned long rtas_log_size; + +static int surveillance_timeout = -1; + +static unsigned int rtas_error_log_max; +static unsigned int rtas_error_log_buffer_max; + +/* RTAS service tokens */ +static unsigned int event_scan; +static unsigned int rtas_event_scan_rate; + +static bool full_rtas_msgs; + +/* Stop logging to nvram after first fatal error */ +static int logging_enabled; /* Until we initialize everything, + * make sure we don't try logging + * anything */ +static int error_log_cnt; + +/* + * Since we use 32 bit RTAS, the physical address of this must be below + * 4G or else bad things happen. Allocate this in the kernel data and + * make it big enough. + */ +static unsigned char logdata[RTAS_ERROR_LOG_MAX]; + +static char *rtas_type[] = { + "Unknown", "Retry", "TCE Error", "Internal Device Failure", + "Timeout", "Data Parity", "Address Parity", "Cache Parity", + "Address Invalid", "ECC Uncorrected", "ECC Corrupted", +}; + +static char *rtas_event_type(int type) +{ + if ((type > 0) && (type < 11)) + return rtas_type[type]; + + switch (type) { + case RTAS_TYPE_EPOW: + return "EPOW"; + case RTAS_TYPE_PLATFORM: + return "Platform Error"; + case RTAS_TYPE_IO: + return "I/O Event"; + case RTAS_TYPE_INFO: + return "Platform Information Event"; + case RTAS_TYPE_DEALLOC: + return "Resource Deallocation Event"; + case RTAS_TYPE_DUMP: + return "Dump Notification Event"; + case RTAS_TYPE_PRRN: + return "Platform Resource Reassignment Event"; + case RTAS_TYPE_HOTPLUG: + return "Hotplug Event"; + } + + return rtas_type[0]; +} + +/* To see this info, grep RTAS /var/log/messages and each entry + * will be collected together with obvious begin/end. + * There will be a unique identifier on the begin and end lines. + * This will persist across reboots. + * + * format of error logs returned from RTAS: + * bytes (size) : contents + * -------------------------------------------------------- + * 0-7 (8) : rtas_error_log + * 8-47 (40) : extended info + * 48-51 (4) : vendor id + * 52-1023 (vendor specific) : location code and debug data + */ +static void printk_log_rtas(char *buf, int len) +{ + + int i,j,n = 0; + int perline = 16; + char buffer[64]; + char * str = "RTAS event"; + + if (full_rtas_msgs) { + printk(RTAS_DEBUG "%d -------- %s begin --------\n", + error_log_cnt, str); + + /* + * Print perline bytes on each line, each line will start + * with RTAS and a changing number, so syslogd will + * print lines that are otherwise the same. Separate every + * 4 bytes with a space. + */ + for (i = 0; i < len; i++) { + j = i % perline; + if (j == 0) { + memset(buffer, 0, sizeof(buffer)); + n = sprintf(buffer, "RTAS %d:", i/perline); + } + + if ((i % 4) == 0) + n += sprintf(buffer+n, " "); + + n += sprintf(buffer+n, "%02x", (unsigned char)buf[i]); + + if (j == (perline-1)) + printk(KERN_DEBUG "%s\n", buffer); + } + if ((i % perline) != 0) + printk(KERN_DEBUG "%s\n", buffer); + + printk(RTAS_DEBUG "%d -------- %s end ----------\n", + error_log_cnt, str); + } else { + struct rtas_error_log *errlog = (struct rtas_error_log *)buf; + + printk(RTAS_DEBUG "event: %d, Type: %s (%d), Severity: %d\n", + error_log_cnt, + rtas_event_type(rtas_error_type(errlog)), + rtas_error_type(errlog), + rtas_error_severity(errlog)); + } +} + +static int log_rtas_len(char * buf) +{ + int len; + struct rtas_error_log *err; + uint32_t extended_log_length; + + /* rtas fixed header */ + len = 8; + err = (struct rtas_error_log *)buf; + extended_log_length = rtas_error_extended_log_length(err); + if (rtas_error_extended(err) && extended_log_length) { + + /* extended header */ + len += extended_log_length; + } + + if (rtas_error_log_max == 0) + rtas_error_log_max = rtas_get_error_log_max(); + + if (len > rtas_error_log_max) + len = rtas_error_log_max; + + return len; +} + +/* + * First write to nvram, if fatal error, that is the only + * place we log the info. The error will be picked up + * on the next reboot by rtasd. If not fatal, run the + * method for the type of error. Currently, only RTAS + * errors have methods implemented, but in the future + * there might be a need to store data in nvram before a + * call to panic(). + * + * XXX We write to nvram periodically, to indicate error has + * been written and sync'd, but there is a possibility + * that if we don't shutdown correctly, a duplicate error + * record will be created on next reboot. + */ +void pSeries_log_error(char *buf, unsigned int err_type, int fatal) +{ + unsigned long offset; + unsigned long s; + int len = 0; + + pr_debug("rtasd: logging event\n"); + if (buf == NULL) + return; + + spin_lock_irqsave(&rtasd_log_lock, s); + + /* get length and increase count */ + switch (err_type & ERR_TYPE_MASK) { + case ERR_TYPE_RTAS_LOG: + len = log_rtas_len(buf); + if (!(err_type & ERR_FLAG_BOOT)) + error_log_cnt++; + break; + case ERR_TYPE_KERNEL_PANIC: + default: + WARN_ON_ONCE(!irqs_disabled()); /* @@@ DEBUG @@@ */ + spin_unlock_irqrestore(&rtasd_log_lock, s); + return; + } + +#ifdef CONFIG_PPC64 + /* Write error to NVRAM */ + if (logging_enabled && !(err_type & ERR_FLAG_BOOT)) + nvram_write_error_log(buf, len, err_type, error_log_cnt); +#endif /* CONFIG_PPC64 */ + + /* + * rtas errors can occur during boot, and we do want to capture + * those somewhere, even if nvram isn't ready (why not?), and even + * if rtasd isn't ready. Put them into the boot log, at least. + */ + if ((err_type & ERR_TYPE_MASK) == ERR_TYPE_RTAS_LOG) + printk_log_rtas(buf, len); + + /* Check to see if we need to or have stopped logging */ + if (fatal || !logging_enabled) { + logging_enabled = 0; + WARN_ON_ONCE(!irqs_disabled()); /* @@@ DEBUG @@@ */ + spin_unlock_irqrestore(&rtasd_log_lock, s); + return; + } + + /* call type specific method for error */ + switch (err_type & ERR_TYPE_MASK) { + case ERR_TYPE_RTAS_LOG: + offset = rtas_error_log_buffer_max * + ((rtas_log_start+rtas_log_size) & LOG_NUMBER_MASK); + + /* First copy over sequence number */ + memcpy(&rtas_log_buf[offset], (void *) &error_log_cnt, sizeof(int)); + + /* Second copy over error log data */ + offset += sizeof(int); + memcpy(&rtas_log_buf[offset], buf, len); + + if (rtas_log_size < LOG_NUMBER) + rtas_log_size += 1; + else + rtas_log_start += 1; + + WARN_ON_ONCE(!irqs_disabled()); /* @@@ DEBUG @@@ */ + spin_unlock_irqrestore(&rtasd_log_lock, s); + wake_up_interruptible(&rtas_log_wait); + break; + case ERR_TYPE_KERNEL_PANIC: + default: + WARN_ON_ONCE(!irqs_disabled()); /* @@@ DEBUG @@@ */ + spin_unlock_irqrestore(&rtasd_log_lock, s); + return; + } +} + +static void handle_rtas_event(const struct rtas_error_log *log) +{ + if (!machine_is(pseries)) + return; + + if (rtas_error_type(log) == RTAS_TYPE_PRRN) + pr_info_ratelimited("Platform resource reassignment ignored.\n"); +} + +static int rtas_log_open(struct inode * inode, struct file * file) +{ + return 0; +} + +static int rtas_log_release(struct inode * inode, struct file * file) +{ + return 0; +} + +/* This will check if all events are logged, if they are then, we + * know that we can safely clear the events in NVRAM. + * Next we'll sit and wait for something else to log. + */ +static ssize_t rtas_log_read(struct file * file, char __user * buf, + size_t count, loff_t *ppos) +{ + int error; + char *tmp; + unsigned long s; + unsigned long offset; + + if (!buf || count < rtas_error_log_buffer_max) + return -EINVAL; + + count = rtas_error_log_buffer_max; + + if (!access_ok(buf, count)) + return -EFAULT; + + tmp = kmalloc(count, GFP_KERNEL); + if (!tmp) + return -ENOMEM; + + spin_lock_irqsave(&rtasd_log_lock, s); + + /* if it's 0, then we know we got the last one (the one in NVRAM) */ + while (rtas_log_size == 0) { + if (file->f_flags & O_NONBLOCK) { + spin_unlock_irqrestore(&rtasd_log_lock, s); + error = -EAGAIN; + goto out; + } + + if (!logging_enabled) { + spin_unlock_irqrestore(&rtasd_log_lock, s); + error = -ENODATA; + goto out; + } +#ifdef CONFIG_PPC64 + nvram_clear_error_log(); +#endif /* CONFIG_PPC64 */ + + spin_unlock_irqrestore(&rtasd_log_lock, s); + error = wait_event_interruptible(rtas_log_wait, rtas_log_size); + if (error) + goto out; + spin_lock_irqsave(&rtasd_log_lock, s); + } + + offset = rtas_error_log_buffer_max * (rtas_log_start & LOG_NUMBER_MASK); + memcpy(tmp, &rtas_log_buf[offset], count); + + rtas_log_start += 1; + rtas_log_size -= 1; + spin_unlock_irqrestore(&rtasd_log_lock, s); + + error = copy_to_user(buf, tmp, count) ? -EFAULT : count; +out: + kfree(tmp); + return error; +} + +static __poll_t rtas_log_poll(struct file *file, poll_table * wait) +{ + poll_wait(file, &rtas_log_wait, wait); + if (rtas_log_size) + return EPOLLIN | EPOLLRDNORM; + return 0; +} + +static const struct proc_ops rtas_log_proc_ops = { + .proc_read = rtas_log_read, + .proc_poll = rtas_log_poll, + .proc_open = rtas_log_open, + .proc_release = rtas_log_release, + .proc_lseek = noop_llseek, +}; + +static int enable_surveillance(int timeout) +{ + int error; + + error = rtas_set_indicator(SURVEILLANCE_TOKEN, 0, timeout); + + if (error == 0) + return 0; + + if (error == -EINVAL) { + printk(KERN_DEBUG "rtasd: surveillance not supported\n"); + return 0; + } + + printk(KERN_ERR "rtasd: could not update surveillance\n"); + return -1; +} + +static void do_event_scan(void) +{ + int error; + do { + memset(logdata, 0, rtas_error_log_max); + error = rtas_call(event_scan, 4, 1, NULL, + RTAS_EVENT_SCAN_ALL_EVENTS, 0, + __pa(logdata), rtas_error_log_max); + if (error == -1) { + printk(KERN_ERR "event-scan failed\n"); + break; + } + + if (error == 0) { + if (rtas_error_type((struct rtas_error_log *)logdata) != + RTAS_TYPE_PRRN) + pSeries_log_error(logdata, ERR_TYPE_RTAS_LOG, + 0); + handle_rtas_event((struct rtas_error_log *)logdata); + } + + } while(error == 0); +} + +static void rtas_event_scan(struct work_struct *w); +static DECLARE_DELAYED_WORK(event_scan_work, rtas_event_scan); + +/* + * Delay should be at least one second since some machines have problems if + * we call event-scan too quickly. + */ +static unsigned long event_scan_delay = 1*HZ; +static int first_pass = 1; + +static void rtas_event_scan(struct work_struct *w) +{ + unsigned int cpu; + + do_event_scan(); + + cpus_read_lock(); + + /* raw_ OK because just using CPU as starting point. */ + cpu = cpumask_next(raw_smp_processor_id(), cpu_online_mask); + if (cpu >= nr_cpu_ids) { + cpu = cpumask_first(cpu_online_mask); + + if (first_pass) { + first_pass = 0; + event_scan_delay = 30*HZ/rtas_event_scan_rate; + + if (surveillance_timeout != -1) { + pr_debug("rtasd: enabling surveillance\n"); + enable_surveillance(surveillance_timeout); + pr_debug("rtasd: surveillance enabled\n"); + } + } + } + + schedule_delayed_work_on(cpu, &event_scan_work, + __round_jiffies_relative(event_scan_delay, cpu)); + + cpus_read_unlock(); +} + +#ifdef CONFIG_PPC64 +static void __init retrieve_nvram_error_log(void) +{ + unsigned int err_type ; + int rc ; + + /* See if we have any error stored in NVRAM */ + memset(logdata, 0, rtas_error_log_max); + rc = nvram_read_error_log(logdata, rtas_error_log_max, + &err_type, &error_log_cnt); + /* We can use rtas_log_buf now */ + logging_enabled = 1; + if (!rc) { + if (err_type != ERR_FLAG_ALREADY_LOGGED) { + pSeries_log_error(logdata, err_type | ERR_FLAG_BOOT, 0); + } + } +} +#else /* CONFIG_PPC64 */ +static void __init retrieve_nvram_error_log(void) +{ +} +#endif /* CONFIG_PPC64 */ + +static void __init start_event_scan(void) +{ + printk(KERN_DEBUG "RTAS daemon started\n"); + pr_debug("rtasd: will sleep for %d milliseconds\n", + (30000 / rtas_event_scan_rate)); + + /* Retrieve errors from nvram if any */ + retrieve_nvram_error_log(); + + schedule_delayed_work_on(cpumask_first(cpu_online_mask), + &event_scan_work, event_scan_delay); +} + +/* Cancel the rtas event scan work */ +void rtas_cancel_event_scan(void) +{ + cancel_delayed_work_sync(&event_scan_work); +} +EXPORT_SYMBOL_GPL(rtas_cancel_event_scan); + +static int __init rtas_event_scan_init(void) +{ + if (!machine_is(pseries) && !machine_is(chrp)) + return 0; + + /* No RTAS */ + event_scan = rtas_token("event-scan"); + if (event_scan == RTAS_UNKNOWN_SERVICE) { + printk(KERN_INFO "rtasd: No event-scan on system\n"); + return -ENODEV; + } + + rtas_event_scan_rate = rtas_token("rtas-event-scan-rate"); + if (rtas_event_scan_rate == RTAS_UNKNOWN_SERVICE) { + printk(KERN_ERR "rtasd: no rtas-event-scan-rate on system\n"); + return -ENODEV; + } + + if (!rtas_event_scan_rate) { + /* Broken firmware: take a rate of zero to mean don't scan */ + printk(KERN_DEBUG "rtasd: scan rate is 0, not scanning\n"); + return 0; + } + + /* Make room for the sequence number */ + rtas_error_log_max = rtas_get_error_log_max(); + rtas_error_log_buffer_max = rtas_error_log_max + sizeof(int); + + rtas_log_buf = vmalloc(array_size(LOG_NUMBER, + rtas_error_log_buffer_max)); + if (!rtas_log_buf) { + printk(KERN_ERR "rtasd: no memory\n"); + return -ENOMEM; + } + + start_event_scan(); + + return 0; +} +arch_initcall(rtas_event_scan_init); + +static int __init rtas_init(void) +{ + struct proc_dir_entry *entry; + + if (!machine_is(pseries) && !machine_is(chrp)) + return 0; + + if (!rtas_log_buf) + return -ENODEV; + + entry = proc_create("powerpc/rtas/error_log", 0400, NULL, + &rtas_log_proc_ops); + if (!entry) + printk(KERN_ERR "Failed to create error_log proc entry\n"); + + return 0; +} +__initcall(rtas_init); + +static int __init surveillance_setup(char *str) +{ + int i; + + /* We only do surveillance on pseries */ + if (!machine_is(pseries)) + return 0; + + if (get_option(&str,&i)) { + if (i >= 0 && i <= 255) + surveillance_timeout = i; + } + + return 1; +} +__setup("surveillance=", surveillance_setup); + +static int __init rtasmsgs_setup(char *str) +{ + return (kstrtobool(str, &full_rtas_msgs) == 0); +} +__setup("rtasmsgs=", rtasmsgs_setup); diff --git a/arch/powerpc/kernel/secure_boot.c b/arch/powerpc/kernel/secure_boot.c new file mode 100644 index 000000000..f9af305d9 --- /dev/null +++ b/arch/powerpc/kernel/secure_boot.c @@ -0,0 +1,64 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 IBM Corporation + * Author: Nayna Jain + */ +#include <linux/types.h> +#include <linux/of.h> +#include <asm/secure_boot.h> + +static struct device_node *get_ppc_fw_sb_node(void) +{ + static const struct of_device_id ids[] = { + { .compatible = "ibm,secureboot", }, + { .compatible = "ibm,secureboot-v1", }, + { .compatible = "ibm,secureboot-v2", }, + {}, + }; + + return of_find_matching_node(NULL, ids); +} + +bool is_ppc_secureboot_enabled(void) +{ + struct device_node *node; + bool enabled = false; + u32 secureboot; + + node = get_ppc_fw_sb_node(); + enabled = of_property_read_bool(node, "os-secureboot-enforcing"); + of_node_put(node); + + if (enabled) + goto out; + + if (!of_property_read_u32(of_root, "ibm,secure-boot", &secureboot)) + enabled = (secureboot > 1); + +out: + pr_info("Secure boot mode %s\n", enabled ? "enabled" : "disabled"); + + return enabled; +} + +bool is_ppc_trustedboot_enabled(void) +{ + struct device_node *node; + bool enabled = false; + u32 trustedboot; + + node = get_ppc_fw_sb_node(); + enabled = of_property_read_bool(node, "trusted-enabled"); + of_node_put(node); + + if (enabled) + goto out; + + if (!of_property_read_u32(of_root, "ibm,trusted-boot", &trustedboot)) + enabled = (trustedboot > 0); + +out: + pr_info("Trusted boot mode %s\n", enabled ? "enabled" : "disabled"); + + return enabled; +} diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c new file mode 100644 index 000000000..4856e1a51 --- /dev/null +++ b/arch/powerpc/kernel/security.c @@ -0,0 +1,866 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// Security related flags and so on. +// +// Copyright 2018, Michael Ellerman, IBM Corporation. + +#include <linux/cpu.h> +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/memblock.h> +#include <linux/nospec.h> +#include <linux/prctl.h> +#include <linux/seq_buf.h> +#include <linux/debugfs.h> + +#include <asm/asm-prototypes.h> +#include <asm/code-patching.h> +#include <asm/security_features.h> +#include <asm/sections.h> +#include <asm/setup.h> +#include <asm/inst.h> + +#include "setup.h" + +u64 powerpc_security_features __read_mostly = SEC_FTR_DEFAULT; + +enum branch_cache_flush_type { + BRANCH_CACHE_FLUSH_NONE = 0x1, + BRANCH_CACHE_FLUSH_SW = 0x2, + BRANCH_CACHE_FLUSH_HW = 0x4, +}; +static enum branch_cache_flush_type count_cache_flush_type = BRANCH_CACHE_FLUSH_NONE; +static enum branch_cache_flush_type link_stack_flush_type = BRANCH_CACHE_FLUSH_NONE; + +bool barrier_nospec_enabled; +static bool no_nospec; +static bool btb_flush_enabled; +#if defined(CONFIG_PPC_E500) || defined(CONFIG_PPC_BOOK3S_64) +static bool no_spectrev2; +#endif + +static void enable_barrier_nospec(bool enable) +{ + barrier_nospec_enabled = enable; + do_barrier_nospec_fixups(enable); +} + +void __init setup_barrier_nospec(void) +{ + bool enable; + + /* + * It would make sense to check SEC_FTR_SPEC_BAR_ORI31 below as well. + * But there's a good reason not to. The two flags we check below are + * both are enabled by default in the kernel, so if the hcall is not + * functional they will be enabled. + * On a system where the host firmware has been updated (so the ori + * functions as a barrier), but on which the hypervisor (KVM/Qemu) has + * not been updated, we would like to enable the barrier. Dropping the + * check for SEC_FTR_SPEC_BAR_ORI31 achieves that. The only downside is + * we potentially enable the barrier on systems where the host firmware + * is not updated, but that's harmless as it's a no-op. + */ + enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && + security_ftr_enabled(SEC_FTR_BNDS_CHK_SPEC_BAR); + + if (!no_nospec && !cpu_mitigations_off()) + enable_barrier_nospec(enable); +} + +static int __init handle_nospectre_v1(char *p) +{ + no_nospec = true; + + return 0; +} +early_param("nospectre_v1", handle_nospectre_v1); + +#ifdef CONFIG_DEBUG_FS +static int barrier_nospec_set(void *data, u64 val) +{ + switch (val) { + case 0: + case 1: + break; + default: + return -EINVAL; + } + + if (!!val == !!barrier_nospec_enabled) + return 0; + + enable_barrier_nospec(!!val); + + return 0; +} + +static int barrier_nospec_get(void *data, u64 *val) +{ + *val = barrier_nospec_enabled ? 1 : 0; + return 0; +} + +DEFINE_DEBUGFS_ATTRIBUTE(fops_barrier_nospec, barrier_nospec_get, + barrier_nospec_set, "%llu\n"); + +static __init int barrier_nospec_debugfs_init(void) +{ + debugfs_create_file_unsafe("barrier_nospec", 0600, + arch_debugfs_dir, NULL, + &fops_barrier_nospec); + return 0; +} +device_initcall(barrier_nospec_debugfs_init); + +static __init int security_feature_debugfs_init(void) +{ + debugfs_create_x64("security_features", 0400, arch_debugfs_dir, + &powerpc_security_features); + return 0; +} +device_initcall(security_feature_debugfs_init); +#endif /* CONFIG_DEBUG_FS */ + +#if defined(CONFIG_PPC_E500) || defined(CONFIG_PPC_BOOK3S_64) +static int __init handle_nospectre_v2(char *p) +{ + no_spectrev2 = true; + + return 0; +} +early_param("nospectre_v2", handle_nospectre_v2); +#endif /* CONFIG_PPC_E500 || CONFIG_PPC_BOOK3S_64 */ + +#ifdef CONFIG_PPC_E500 +void __init setup_spectre_v2(void) +{ + if (no_spectrev2 || cpu_mitigations_off()) + do_btb_flush_fixups(); + else + btb_flush_enabled = true; +} +#endif /* CONFIG_PPC_E500 */ + +#ifdef CONFIG_PPC_BOOK3S_64 +ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, char *buf) +{ + bool thread_priv; + + thread_priv = security_ftr_enabled(SEC_FTR_L1D_THREAD_PRIV); + + if (rfi_flush) { + struct seq_buf s; + seq_buf_init(&s, buf, PAGE_SIZE - 1); + + seq_buf_printf(&s, "Mitigation: RFI Flush"); + if (thread_priv) + seq_buf_printf(&s, ", L1D private per thread"); + + seq_buf_printf(&s, "\n"); + + return s.len; + } + + if (thread_priv) + return sprintf(buf, "Vulnerable: L1D private per thread\n"); + + if (!security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV) && + !security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR)) + return sprintf(buf, "Not affected\n"); + + return sprintf(buf, "Vulnerable\n"); +} + +ssize_t cpu_show_l1tf(struct device *dev, struct device_attribute *attr, char *buf) +{ + return cpu_show_meltdown(dev, attr, buf); +} +#endif + +ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct seq_buf s; + + seq_buf_init(&s, buf, PAGE_SIZE - 1); + + if (security_ftr_enabled(SEC_FTR_BNDS_CHK_SPEC_BAR)) { + if (barrier_nospec_enabled) + seq_buf_printf(&s, "Mitigation: __user pointer sanitization"); + else + seq_buf_printf(&s, "Vulnerable"); + + if (security_ftr_enabled(SEC_FTR_SPEC_BAR_ORI31)) + seq_buf_printf(&s, ", ori31 speculation barrier enabled"); + + seq_buf_printf(&s, "\n"); + } else + seq_buf_printf(&s, "Not affected\n"); + + return s.len; +} + +ssize_t cpu_show_spectre_v2(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct seq_buf s; + bool bcs, ccd; + + seq_buf_init(&s, buf, PAGE_SIZE - 1); + + bcs = security_ftr_enabled(SEC_FTR_BCCTRL_SERIALISED); + ccd = security_ftr_enabled(SEC_FTR_COUNT_CACHE_DISABLED); + + if (bcs || ccd) { + seq_buf_printf(&s, "Mitigation: "); + + if (bcs) + seq_buf_printf(&s, "Indirect branch serialisation (kernel only)"); + + if (bcs && ccd) + seq_buf_printf(&s, ", "); + + if (ccd) + seq_buf_printf(&s, "Indirect branch cache disabled"); + + } else if (count_cache_flush_type != BRANCH_CACHE_FLUSH_NONE) { + seq_buf_printf(&s, "Mitigation: Software count cache flush"); + + if (count_cache_flush_type == BRANCH_CACHE_FLUSH_HW) + seq_buf_printf(&s, " (hardware accelerated)"); + + } else if (btb_flush_enabled) { + seq_buf_printf(&s, "Mitigation: Branch predictor state flush"); + } else { + seq_buf_printf(&s, "Vulnerable"); + } + + if (bcs || ccd || count_cache_flush_type != BRANCH_CACHE_FLUSH_NONE) { + if (link_stack_flush_type != BRANCH_CACHE_FLUSH_NONE) + seq_buf_printf(&s, ", Software link stack flush"); + if (link_stack_flush_type == BRANCH_CACHE_FLUSH_HW) + seq_buf_printf(&s, " (hardware accelerated)"); + } + + seq_buf_printf(&s, "\n"); + + return s.len; +} + +#ifdef CONFIG_PPC_BOOK3S_64 +/* + * Store-forwarding barrier support. + */ + +static enum stf_barrier_type stf_enabled_flush_types; +static bool no_stf_barrier; +static bool stf_barrier; + +static int __init handle_no_stf_barrier(char *p) +{ + pr_info("stf-barrier: disabled on command line."); + no_stf_barrier = true; + return 0; +} + +early_param("no_stf_barrier", handle_no_stf_barrier); + +enum stf_barrier_type stf_barrier_type_get(void) +{ + return stf_enabled_flush_types; +} + +/* This is the generic flag used by other architectures */ +static int __init handle_ssbd(char *p) +{ + if (!p || strncmp(p, "auto", 5) == 0 || strncmp(p, "on", 2) == 0 ) { + /* Until firmware tells us, we have the barrier with auto */ + return 0; + } else if (strncmp(p, "off", 3) == 0) { + handle_no_stf_barrier(NULL); + return 0; + } else + return 1; + + return 0; +} +early_param("spec_store_bypass_disable", handle_ssbd); + +/* This is the generic flag used by other architectures */ +static int __init handle_no_ssbd(char *p) +{ + handle_no_stf_barrier(NULL); + return 0; +} +early_param("nospec_store_bypass_disable", handle_no_ssbd); + +static void stf_barrier_enable(bool enable) +{ + if (enable) + do_stf_barrier_fixups(stf_enabled_flush_types); + else + do_stf_barrier_fixups(STF_BARRIER_NONE); + + stf_barrier = enable; +} + +void setup_stf_barrier(void) +{ + enum stf_barrier_type type; + bool enable; + + /* Default to fallback in case fw-features are not available */ + if (cpu_has_feature(CPU_FTR_ARCH_300)) + type = STF_BARRIER_EIEIO; + else if (cpu_has_feature(CPU_FTR_ARCH_207S)) + type = STF_BARRIER_SYNC_ORI; + else if (cpu_has_feature(CPU_FTR_ARCH_206)) + type = STF_BARRIER_FALLBACK; + else + type = STF_BARRIER_NONE; + + enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && + security_ftr_enabled(SEC_FTR_STF_BARRIER); + + if (type == STF_BARRIER_FALLBACK) { + pr_info("stf-barrier: fallback barrier available\n"); + } else if (type == STF_BARRIER_SYNC_ORI) { + pr_info("stf-barrier: hwsync barrier available\n"); + } else if (type == STF_BARRIER_EIEIO) { + pr_info("stf-barrier: eieio barrier available\n"); + } + + stf_enabled_flush_types = type; + + if (!no_stf_barrier && !cpu_mitigations_off()) + stf_barrier_enable(enable); +} + +ssize_t cpu_show_spec_store_bypass(struct device *dev, struct device_attribute *attr, char *buf) +{ + if (stf_barrier && stf_enabled_flush_types != STF_BARRIER_NONE) { + const char *type; + switch (stf_enabled_flush_types) { + case STF_BARRIER_EIEIO: + type = "eieio"; + break; + case STF_BARRIER_SYNC_ORI: + type = "hwsync"; + break; + case STF_BARRIER_FALLBACK: + type = "fallback"; + break; + default: + type = "unknown"; + } + return sprintf(buf, "Mitigation: Kernel entry/exit barrier (%s)\n", type); + } + + if (!security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV) && + !security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR)) + return sprintf(buf, "Not affected\n"); + + return sprintf(buf, "Vulnerable\n"); +} + +static int ssb_prctl_get(struct task_struct *task) +{ + /* + * The STF_BARRIER feature is on by default, so if it's off that means + * firmware has explicitly said the CPU is not vulnerable via either + * the hypercall or device tree. + */ + if (!security_ftr_enabled(SEC_FTR_STF_BARRIER)) + return PR_SPEC_NOT_AFFECTED; + + /* + * If the system's CPU has no known barrier (see setup_stf_barrier()) + * then assume that the CPU is not vulnerable. + */ + if (stf_enabled_flush_types == STF_BARRIER_NONE) + return PR_SPEC_NOT_AFFECTED; + + /* + * Otherwise the CPU is vulnerable. The barrier is not a global or + * per-process mitigation, so the only value that can be reported here + * is PR_SPEC_ENABLE, which appears as "vulnerable" in /proc. + */ + return PR_SPEC_ENABLE; +} + +int arch_prctl_spec_ctrl_get(struct task_struct *task, unsigned long which) +{ + switch (which) { + case PR_SPEC_STORE_BYPASS: + return ssb_prctl_get(task); + default: + return -ENODEV; + } +} + +#ifdef CONFIG_DEBUG_FS +static int stf_barrier_set(void *data, u64 val) +{ + bool enable; + + if (val == 1) + enable = true; + else if (val == 0) + enable = false; + else + return -EINVAL; + + /* Only do anything if we're changing state */ + if (enable != stf_barrier) + stf_barrier_enable(enable); + + return 0; +} + +static int stf_barrier_get(void *data, u64 *val) +{ + *val = stf_barrier ? 1 : 0; + return 0; +} + +DEFINE_DEBUGFS_ATTRIBUTE(fops_stf_barrier, stf_barrier_get, stf_barrier_set, + "%llu\n"); + +static __init int stf_barrier_debugfs_init(void) +{ + debugfs_create_file_unsafe("stf_barrier", 0600, arch_debugfs_dir, + NULL, &fops_stf_barrier); + return 0; +} +device_initcall(stf_barrier_debugfs_init); +#endif /* CONFIG_DEBUG_FS */ + +static void update_branch_cache_flush(void) +{ + u32 *site, __maybe_unused *site2; + +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE + site = &patch__call_kvm_flush_link_stack; + site2 = &patch__call_kvm_flush_link_stack_p9; + // This controls the branch from guest_exit_cont to kvm_flush_link_stack + if (link_stack_flush_type == BRANCH_CACHE_FLUSH_NONE) { + patch_instruction_site(site, ppc_inst(PPC_RAW_NOP())); + patch_instruction_site(site2, ppc_inst(PPC_RAW_NOP())); + } else { + // Could use HW flush, but that could also flush count cache + patch_branch_site(site, (u64)&kvm_flush_link_stack, BRANCH_SET_LINK); + patch_branch_site(site2, (u64)&kvm_flush_link_stack, BRANCH_SET_LINK); + } +#endif + + // Patch out the bcctr first, then nop the rest + site = &patch__call_flush_branch_caches3; + patch_instruction_site(site, ppc_inst(PPC_RAW_NOP())); + site = &patch__call_flush_branch_caches2; + patch_instruction_site(site, ppc_inst(PPC_RAW_NOP())); + site = &patch__call_flush_branch_caches1; + patch_instruction_site(site, ppc_inst(PPC_RAW_NOP())); + + // This controls the branch from _switch to flush_branch_caches + if (count_cache_flush_type == BRANCH_CACHE_FLUSH_NONE && + link_stack_flush_type == BRANCH_CACHE_FLUSH_NONE) { + // Nothing to be done + + } else if (count_cache_flush_type == BRANCH_CACHE_FLUSH_HW && + link_stack_flush_type == BRANCH_CACHE_FLUSH_HW) { + // Patch in the bcctr last + site = &patch__call_flush_branch_caches1; + patch_instruction_site(site, ppc_inst(0x39207fff)); // li r9,0x7fff + site = &patch__call_flush_branch_caches2; + patch_instruction_site(site, ppc_inst(0x7d2903a6)); // mtctr r9 + site = &patch__call_flush_branch_caches3; + patch_instruction_site(site, ppc_inst(PPC_INST_BCCTR_FLUSH)); + + } else { + patch_branch_site(site, (u64)&flush_branch_caches, BRANCH_SET_LINK); + + // If we just need to flush the link stack, early return + if (count_cache_flush_type == BRANCH_CACHE_FLUSH_NONE) { + patch_instruction_site(&patch__flush_link_stack_return, + ppc_inst(PPC_RAW_BLR())); + + // If we have flush instruction, early return + } else if (count_cache_flush_type == BRANCH_CACHE_FLUSH_HW) { + patch_instruction_site(&patch__flush_count_cache_return, + ppc_inst(PPC_RAW_BLR())); + } + } +} + +static void toggle_branch_cache_flush(bool enable) +{ + if (!enable || !security_ftr_enabled(SEC_FTR_FLUSH_COUNT_CACHE)) { + if (count_cache_flush_type != BRANCH_CACHE_FLUSH_NONE) + count_cache_flush_type = BRANCH_CACHE_FLUSH_NONE; + + pr_info("count-cache-flush: flush disabled.\n"); + } else { + if (security_ftr_enabled(SEC_FTR_BCCTR_FLUSH_ASSIST)) { + count_cache_flush_type = BRANCH_CACHE_FLUSH_HW; + pr_info("count-cache-flush: hardware flush enabled.\n"); + } else { + count_cache_flush_type = BRANCH_CACHE_FLUSH_SW; + pr_info("count-cache-flush: software flush enabled.\n"); + } + } + + if (!enable || !security_ftr_enabled(SEC_FTR_FLUSH_LINK_STACK)) { + if (link_stack_flush_type != BRANCH_CACHE_FLUSH_NONE) + link_stack_flush_type = BRANCH_CACHE_FLUSH_NONE; + + pr_info("link-stack-flush: flush disabled.\n"); + } else { + if (security_ftr_enabled(SEC_FTR_BCCTR_LINK_FLUSH_ASSIST)) { + link_stack_flush_type = BRANCH_CACHE_FLUSH_HW; + pr_info("link-stack-flush: hardware flush enabled.\n"); + } else { + link_stack_flush_type = BRANCH_CACHE_FLUSH_SW; + pr_info("link-stack-flush: software flush enabled.\n"); + } + } + + update_branch_cache_flush(); +} + +void setup_count_cache_flush(void) +{ + bool enable = true; + + if (no_spectrev2 || cpu_mitigations_off()) { + if (security_ftr_enabled(SEC_FTR_BCCTRL_SERIALISED) || + security_ftr_enabled(SEC_FTR_COUNT_CACHE_DISABLED)) + pr_warn("Spectre v2 mitigations not fully under software control, can't disable\n"); + + enable = false; + } + + /* + * There's no firmware feature flag/hypervisor bit to tell us we need to + * flush the link stack on context switch. So we set it here if we see + * either of the Spectre v2 mitigations that aim to protect userspace. + */ + if (security_ftr_enabled(SEC_FTR_COUNT_CACHE_DISABLED) || + security_ftr_enabled(SEC_FTR_FLUSH_COUNT_CACHE)) + security_ftr_set(SEC_FTR_FLUSH_LINK_STACK); + + toggle_branch_cache_flush(enable); +} + +static enum l1d_flush_type enabled_flush_types; +static void *l1d_flush_fallback_area; +static bool no_rfi_flush; +static bool no_entry_flush; +static bool no_uaccess_flush; +bool rfi_flush; +static bool entry_flush; +static bool uaccess_flush; +DEFINE_STATIC_KEY_FALSE(uaccess_flush_key); +EXPORT_SYMBOL(uaccess_flush_key); + +static int __init handle_no_rfi_flush(char *p) +{ + pr_info("rfi-flush: disabled on command line."); + no_rfi_flush = true; + return 0; +} +early_param("no_rfi_flush", handle_no_rfi_flush); + +static int __init handle_no_entry_flush(char *p) +{ + pr_info("entry-flush: disabled on command line."); + no_entry_flush = true; + return 0; +} +early_param("no_entry_flush", handle_no_entry_flush); + +static int __init handle_no_uaccess_flush(char *p) +{ + pr_info("uaccess-flush: disabled on command line."); + no_uaccess_flush = true; + return 0; +} +early_param("no_uaccess_flush", handle_no_uaccess_flush); + +/* + * The RFI flush is not KPTI, but because users will see doco that says to use + * nopti we hijack that option here to also disable the RFI flush. + */ +static int __init handle_no_pti(char *p) +{ + pr_info("rfi-flush: disabling due to 'nopti' on command line.\n"); + handle_no_rfi_flush(NULL); + return 0; +} +early_param("nopti", handle_no_pti); + +static void do_nothing(void *unused) +{ + /* + * We don't need to do the flush explicitly, just enter+exit kernel is + * sufficient, the RFI exit handlers will do the right thing. + */ +} + +void rfi_flush_enable(bool enable) +{ + if (enable) { + do_rfi_flush_fixups(enabled_flush_types); + on_each_cpu(do_nothing, NULL, 1); + } else + do_rfi_flush_fixups(L1D_FLUSH_NONE); + + rfi_flush = enable; +} + +static void entry_flush_enable(bool enable) +{ + if (enable) { + do_entry_flush_fixups(enabled_flush_types); + on_each_cpu(do_nothing, NULL, 1); + } else { + do_entry_flush_fixups(L1D_FLUSH_NONE); + } + + entry_flush = enable; +} + +static void uaccess_flush_enable(bool enable) +{ + if (enable) { + do_uaccess_flush_fixups(enabled_flush_types); + static_branch_enable(&uaccess_flush_key); + on_each_cpu(do_nothing, NULL, 1); + } else { + static_branch_disable(&uaccess_flush_key); + do_uaccess_flush_fixups(L1D_FLUSH_NONE); + } + + uaccess_flush = enable; +} + +static void __ref init_fallback_flush(void) +{ + u64 l1d_size, limit; + int cpu; + + /* Only allocate the fallback flush area once (at boot time). */ + if (l1d_flush_fallback_area) + return; + + l1d_size = ppc64_caches.l1d.size; + + /* + * If there is no d-cache-size property in the device tree, l1d_size + * could be zero. That leads to the loop in the asm wrapping around to + * 2^64-1, and then walking off the end of the fallback area and + * eventually causing a page fault which is fatal. Just default to + * something vaguely sane. + */ + if (!l1d_size) + l1d_size = (64 * 1024); + + limit = min(ppc64_bolted_size(), ppc64_rma_size); + + /* + * Align to L1d size, and size it at 2x L1d size, to catch possible + * hardware prefetch runoff. We don't have a recipe for load patterns to + * reliably avoid the prefetcher. + */ + l1d_flush_fallback_area = memblock_alloc_try_nid(l1d_size * 2, + l1d_size, MEMBLOCK_LOW_LIMIT, + limit, NUMA_NO_NODE); + if (!l1d_flush_fallback_area) + panic("%s: Failed to allocate %llu bytes align=0x%llx max_addr=%pa\n", + __func__, l1d_size * 2, l1d_size, &limit); + + + for_each_possible_cpu(cpu) { + struct paca_struct *paca = paca_ptrs[cpu]; + paca->rfi_flush_fallback_area = l1d_flush_fallback_area; + paca->l1d_flush_size = l1d_size; + } +} + +void setup_rfi_flush(enum l1d_flush_type types, bool enable) +{ + if (types & L1D_FLUSH_FALLBACK) { + pr_info("rfi-flush: fallback displacement flush available\n"); + init_fallback_flush(); + } + + if (types & L1D_FLUSH_ORI) + pr_info("rfi-flush: ori type flush available\n"); + + if (types & L1D_FLUSH_MTTRIG) + pr_info("rfi-flush: mttrig type flush available\n"); + + enabled_flush_types = types; + + if (!cpu_mitigations_off() && !no_rfi_flush) + rfi_flush_enable(enable); +} + +void setup_entry_flush(bool enable) +{ + if (cpu_mitigations_off()) + return; + + if (!no_entry_flush) + entry_flush_enable(enable); +} + +void setup_uaccess_flush(bool enable) +{ + if (cpu_mitigations_off()) + return; + + if (!no_uaccess_flush) + uaccess_flush_enable(enable); +} + +#ifdef CONFIG_DEBUG_FS +static int count_cache_flush_set(void *data, u64 val) +{ + bool enable; + + if (val == 1) + enable = true; + else if (val == 0) + enable = false; + else + return -EINVAL; + + toggle_branch_cache_flush(enable); + + return 0; +} + +static int count_cache_flush_get(void *data, u64 *val) +{ + if (count_cache_flush_type == BRANCH_CACHE_FLUSH_NONE) + *val = 0; + else + *val = 1; + + return 0; +} + +static int link_stack_flush_get(void *data, u64 *val) +{ + if (link_stack_flush_type == BRANCH_CACHE_FLUSH_NONE) + *val = 0; + else + *val = 1; + + return 0; +} + +DEFINE_DEBUGFS_ATTRIBUTE(fops_count_cache_flush, count_cache_flush_get, + count_cache_flush_set, "%llu\n"); +DEFINE_DEBUGFS_ATTRIBUTE(fops_link_stack_flush, link_stack_flush_get, + count_cache_flush_set, "%llu\n"); + +static __init int count_cache_flush_debugfs_init(void) +{ + debugfs_create_file_unsafe("count_cache_flush", 0600, + arch_debugfs_dir, NULL, + &fops_count_cache_flush); + debugfs_create_file_unsafe("link_stack_flush", 0600, + arch_debugfs_dir, NULL, + &fops_link_stack_flush); + return 0; +} +device_initcall(count_cache_flush_debugfs_init); + +static int rfi_flush_set(void *data, u64 val) +{ + bool enable; + + if (val == 1) + enable = true; + else if (val == 0) + enable = false; + else + return -EINVAL; + + /* Only do anything if we're changing state */ + if (enable != rfi_flush) + rfi_flush_enable(enable); + + return 0; +} + +static int rfi_flush_get(void *data, u64 *val) +{ + *val = rfi_flush ? 1 : 0; + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(fops_rfi_flush, rfi_flush_get, rfi_flush_set, "%llu\n"); + +static int entry_flush_set(void *data, u64 val) +{ + bool enable; + + if (val == 1) + enable = true; + else if (val == 0) + enable = false; + else + return -EINVAL; + + /* Only do anything if we're changing state */ + if (enable != entry_flush) + entry_flush_enable(enable); + + return 0; +} + +static int entry_flush_get(void *data, u64 *val) +{ + *val = entry_flush ? 1 : 0; + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(fops_entry_flush, entry_flush_get, entry_flush_set, "%llu\n"); + +static int uaccess_flush_set(void *data, u64 val) +{ + bool enable; + + if (val == 1) + enable = true; + else if (val == 0) + enable = false; + else + return -EINVAL; + + /* Only do anything if we're changing state */ + if (enable != uaccess_flush) + uaccess_flush_enable(enable); + + return 0; +} + +static int uaccess_flush_get(void *data, u64 *val) +{ + *val = uaccess_flush ? 1 : 0; + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(fops_uaccess_flush, uaccess_flush_get, uaccess_flush_set, "%llu\n"); + +static __init int rfi_flush_debugfs_init(void) +{ + debugfs_create_file("rfi_flush", 0600, arch_debugfs_dir, NULL, &fops_rfi_flush); + debugfs_create_file("entry_flush", 0600, arch_debugfs_dir, NULL, &fops_entry_flush); + debugfs_create_file("uaccess_flush", 0600, arch_debugfs_dir, NULL, &fops_uaccess_flush); + return 0; +} +device_initcall(rfi_flush_debugfs_init); +#endif /* CONFIG_DEBUG_FS */ +#endif /* CONFIG_PPC_BOOK3S_64 */ diff --git a/arch/powerpc/kernel/secvar-ops.c b/arch/powerpc/kernel/secvar-ops.c new file mode 100644 index 000000000..6a29777d6 --- /dev/null +++ b/arch/powerpc/kernel/secvar-ops.c @@ -0,0 +1,17 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 IBM Corporation + * Author: Nayna Jain + * + * This file initializes secvar operations for PowerPC Secureboot + */ + +#include <linux/cache.h> +#include <asm/secvar.h> + +const struct secvar_operations *secvar_ops __ro_after_init; + +void set_secvar_ops(const struct secvar_operations *ops) +{ + secvar_ops = ops; +} diff --git a/arch/powerpc/kernel/secvar-sysfs.c b/arch/powerpc/kernel/secvar-sysfs.c new file mode 100644 index 000000000..1ee4640a2 --- /dev/null +++ b/arch/powerpc/kernel/secvar-sysfs.c @@ -0,0 +1,251 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2019 IBM Corporation <nayna@linux.ibm.com> + * + * This code exposes secure variables to user via sysfs + */ + +#define pr_fmt(fmt) "secvar-sysfs: "fmt + +#include <linux/slab.h> +#include <linux/compat.h> +#include <linux/string.h> +#include <linux/of.h> +#include <asm/secvar.h> + +#define NAME_MAX_SIZE 1024 + +static struct kobject *secvar_kobj; +static struct kset *secvar_kset; + +static ssize_t format_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + ssize_t rc = 0; + struct device_node *node; + const char *format; + + node = of_find_compatible_node(NULL, NULL, "ibm,secvar-backend"); + if (!of_device_is_available(node)) { + rc = -ENODEV; + goto out; + } + + rc = of_property_read_string(node, "format", &format); + if (rc) + goto out; + + rc = sprintf(buf, "%s\n", format); + +out: + of_node_put(node); + + return rc; +} + + +static ssize_t size_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + uint64_t dsize; + int rc; + + rc = secvar_ops->get(kobj->name, strlen(kobj->name) + 1, NULL, &dsize); + if (rc) { + pr_err("Error retrieving %s variable size %d\n", kobj->name, + rc); + return rc; + } + + return sprintf(buf, "%llu\n", dsize); +} + +static ssize_t data_read(struct file *filep, struct kobject *kobj, + struct bin_attribute *attr, char *buf, loff_t off, + size_t count) +{ + uint64_t dsize; + char *data; + int rc; + + rc = secvar_ops->get(kobj->name, strlen(kobj->name) + 1, NULL, &dsize); + if (rc) { + pr_err("Error getting %s variable size %d\n", kobj->name, rc); + return rc; + } + pr_debug("dsize is %llu\n", dsize); + + data = kzalloc(dsize, GFP_KERNEL); + if (!data) + return -ENOMEM; + + rc = secvar_ops->get(kobj->name, strlen(kobj->name) + 1, data, &dsize); + if (rc) { + pr_err("Error getting %s variable %d\n", kobj->name, rc); + goto data_fail; + } + + rc = memory_read_from_buffer(buf, count, &off, data, dsize); + +data_fail: + kfree(data); + return rc; +} + +static ssize_t update_write(struct file *filep, struct kobject *kobj, + struct bin_attribute *attr, char *buf, loff_t off, + size_t count) +{ + int rc; + + pr_debug("count is %ld\n", count); + rc = secvar_ops->set(kobj->name, strlen(kobj->name) + 1, buf, count); + if (rc) { + pr_err("Error setting the %s variable %d\n", kobj->name, rc); + return rc; + } + + return count; +} + +static struct kobj_attribute format_attr = __ATTR_RO(format); + +static struct kobj_attribute size_attr = __ATTR_RO(size); + +static struct bin_attribute data_attr = __BIN_ATTR_RO(data, 0); + +static struct bin_attribute update_attr = __BIN_ATTR_WO(update, 0); + +static struct bin_attribute *secvar_bin_attrs[] = { + &data_attr, + &update_attr, + NULL, +}; + +static struct attribute *secvar_attrs[] = { + &size_attr.attr, + NULL, +}; + +static const struct attribute_group secvar_attr_group = { + .attrs = secvar_attrs, + .bin_attrs = secvar_bin_attrs, +}; +__ATTRIBUTE_GROUPS(secvar_attr); + +static struct kobj_type secvar_ktype = { + .sysfs_ops = &kobj_sysfs_ops, + .default_groups = secvar_attr_groups, +}; + +static int update_kobj_size(void) +{ + + struct device_node *node; + u64 varsize; + int rc = 0; + + node = of_find_compatible_node(NULL, NULL, "ibm,secvar-backend"); + if (!of_device_is_available(node)) { + rc = -ENODEV; + goto out; + } + + rc = of_property_read_u64(node, "max-var-size", &varsize); + if (rc) + goto out; + + data_attr.size = varsize; + update_attr.size = varsize; + +out: + of_node_put(node); + + return rc; +} + +static int secvar_sysfs_load(void) +{ + char *name; + uint64_t namesize = 0; + struct kobject *kobj; + int rc; + + name = kzalloc(NAME_MAX_SIZE, GFP_KERNEL); + if (!name) + return -ENOMEM; + + do { + rc = secvar_ops->get_next(name, &namesize, NAME_MAX_SIZE); + if (rc) { + if (rc != -ENOENT) + pr_err("error getting secvar from firmware %d\n", + rc); + break; + } + + kobj = kzalloc(sizeof(*kobj), GFP_KERNEL); + if (!kobj) { + rc = -ENOMEM; + break; + } + + kobject_init(kobj, &secvar_ktype); + + rc = kobject_add(kobj, &secvar_kset->kobj, "%s", name); + if (rc) { + pr_warn("kobject_add error %d for attribute: %s\n", rc, + name); + kobject_put(kobj); + kobj = NULL; + } + + if (kobj) + kobject_uevent(kobj, KOBJ_ADD); + + } while (!rc); + + kfree(name); + return rc; +} + +static int secvar_sysfs_init(void) +{ + int rc; + + if (!secvar_ops) { + pr_warn("secvar: failed to retrieve secvar operations.\n"); + return -ENODEV; + } + + secvar_kobj = kobject_create_and_add("secvar", firmware_kobj); + if (!secvar_kobj) { + pr_err("secvar: Failed to create firmware kobj\n"); + return -ENOMEM; + } + + rc = sysfs_create_file(secvar_kobj, &format_attr.attr); + if (rc) { + kobject_put(secvar_kobj); + return -ENOMEM; + } + + secvar_kset = kset_create_and_add("vars", NULL, secvar_kobj); + if (!secvar_kset) { + pr_err("secvar: sysfs kobject registration failed.\n"); + kobject_put(secvar_kobj); + return -ENOMEM; + } + + rc = update_kobj_size(); + if (rc) { + pr_err("Cannot read the size of the attribute\n"); + return rc; + } + + secvar_sysfs_load(); + + return 0; +} + +late_initcall(secvar_sysfs_init); diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c new file mode 100644 index 000000000..59b4ac57b --- /dev/null +++ b/arch/powerpc/kernel/setup-common.c @@ -0,0 +1,1007 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Common boot and setup code for both 32-bit and 64-bit. + * Extracted from arch/powerpc/kernel/setup_64.c. + * + * Copyright (C) 2001 PPC64 Team, IBM Corp + */ + +#undef DEBUG + +#include <linux/export.h> +#include <linux/panic_notifier.h> +#include <linux/string.h> +#include <linux/sched.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/reboot.h> +#include <linux/delay.h> +#include <linux/initrd.h> +#include <linux/platform_device.h> +#include <linux/printk.h> +#include <linux/seq_file.h> +#include <linux/ioport.h> +#include <linux/console.h> +#include <linux/screen_info.h> +#include <linux/root_dev.h> +#include <linux/cpu.h> +#include <linux/unistd.h> +#include <linux/seq_buf.h> +#include <linux/serial.h> +#include <linux/serial_8250.h> +#include <linux/percpu.h> +#include <linux/memblock.h> +#include <linux/of_irq.h> +#include <linux/of_fdt.h> +#include <linux/of_platform.h> +#include <linux/hugetlb.h> +#include <linux/pgtable.h> +#include <asm/io.h> +#include <asm/paca.h> +#include <asm/processor.h> +#include <asm/vdso_datapage.h> +#include <asm/smp.h> +#include <asm/elf.h> +#include <asm/machdep.h> +#include <asm/time.h> +#include <asm/cputable.h> +#include <asm/sections.h> +#include <asm/firmware.h> +#include <asm/btext.h> +#include <asm/nvram.h> +#include <asm/setup.h> +#include <asm/rtas.h> +#include <asm/iommu.h> +#include <asm/serial.h> +#include <asm/cache.h> +#include <asm/page.h> +#include <asm/mmu.h> +#include <asm/xmon.h> +#include <asm/cputhreads.h> +#include <mm/mmu_decl.h> +#include <asm/fadump.h> +#include <asm/udbg.h> +#include <asm/hugetlb.h> +#include <asm/livepatch.h> +#include <asm/mmu_context.h> +#include <asm/cpu_has_feature.h> +#include <asm/kasan.h> +#include <asm/mce.h> + +#include "setup.h" + +#ifdef DEBUG +#define DBG(fmt...) udbg_printf(fmt) +#else +#define DBG(fmt...) +#endif + +/* The main machine-dep calls structure + */ +struct machdep_calls ppc_md; +EXPORT_SYMBOL(ppc_md); +struct machdep_calls *machine_id; +EXPORT_SYMBOL(machine_id); + +int boot_cpuid = -1; +EXPORT_SYMBOL_GPL(boot_cpuid); + +#ifdef CONFIG_PPC64 +int boot_cpu_hwid = -1; +#endif + +/* + * These are used in binfmt_elf.c to put aux entries on the stack + * for each elf executable being started. + */ +int dcache_bsize; +int icache_bsize; + +/* + * This still seems to be needed... -- paulus + */ +struct screen_info screen_info = { + .orig_x = 0, + .orig_y = 25, + .orig_video_cols = 80, + .orig_video_lines = 25, + .orig_video_isVGA = 1, + .orig_video_points = 16 +}; +#if defined(CONFIG_FB_VGA16_MODULE) +EXPORT_SYMBOL(screen_info); +#endif + +/* Variables required to store legacy IO irq routing */ +int of_i8042_kbd_irq; +EXPORT_SYMBOL_GPL(of_i8042_kbd_irq); +int of_i8042_aux_irq; +EXPORT_SYMBOL_GPL(of_i8042_aux_irq); + +#ifdef __DO_IRQ_CANON +/* XXX should go elsewhere eventually */ +int ppc_do_canonicalize_irqs; +EXPORT_SYMBOL(ppc_do_canonicalize_irqs); +#endif + +#ifdef CONFIG_CRASH_CORE +/* This keeps a track of which one is the crashing cpu. */ +int crashing_cpu = -1; +#endif + +/* also used by kexec */ +void machine_shutdown(void) +{ + /* + * if fadump is active, cleanup the fadump registration before we + * shutdown. + */ + fadump_cleanup(); + + if (ppc_md.machine_shutdown) + ppc_md.machine_shutdown(); +} + +static void machine_hang(void) +{ + pr_emerg("System Halted, OK to turn off power\n"); + local_irq_disable(); + while (1) + ; +} + +void machine_restart(char *cmd) +{ + machine_shutdown(); + if (ppc_md.restart) + ppc_md.restart(cmd); + + smp_send_stop(); + + do_kernel_restart(cmd); + mdelay(1000); + + machine_hang(); +} + +void machine_power_off(void) +{ + machine_shutdown(); + do_kernel_power_off(); + smp_send_stop(); + machine_hang(); +} +/* Used by the G5 thermal driver */ +EXPORT_SYMBOL_GPL(machine_power_off); + +void (*pm_power_off)(void); +EXPORT_SYMBOL_GPL(pm_power_off); + +size_t __must_check arch_get_random_seed_longs(unsigned long *v, size_t max_longs) +{ + if (max_longs && ppc_md.get_random_seed && ppc_md.get_random_seed(v)) + return 1; + return 0; +} +EXPORT_SYMBOL(arch_get_random_seed_longs); + +void machine_halt(void) +{ + machine_shutdown(); + if (ppc_md.halt) + ppc_md.halt(); + + smp_send_stop(); + machine_hang(); +} + +#ifdef CONFIG_SMP +DEFINE_PER_CPU(unsigned int, cpu_pvr); +#endif + +static void show_cpuinfo_summary(struct seq_file *m) +{ + struct device_node *root; + const char *model = NULL; + unsigned long bogosum = 0; + int i; + + if (IS_ENABLED(CONFIG_SMP) && IS_ENABLED(CONFIG_PPC32)) { + for_each_online_cpu(i) + bogosum += loops_per_jiffy; + seq_printf(m, "total bogomips\t: %lu.%02lu\n", + bogosum / (500000 / HZ), bogosum / (5000 / HZ) % 100); + } + seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq); + if (ppc_md.name) + seq_printf(m, "platform\t: %s\n", ppc_md.name); + root = of_find_node_by_path("/"); + if (root) + model = of_get_property(root, "model", NULL); + if (model) + seq_printf(m, "model\t\t: %s\n", model); + of_node_put(root); + + if (ppc_md.show_cpuinfo != NULL) + ppc_md.show_cpuinfo(m); + + /* Display the amount of memory */ + if (IS_ENABLED(CONFIG_PPC32)) + seq_printf(m, "Memory\t\t: %d MB\n", + (unsigned int)(total_memory / (1024 * 1024))); +} + +static int show_cpuinfo(struct seq_file *m, void *v) +{ + unsigned long cpu_id = (unsigned long)v - 1; + unsigned int pvr; + unsigned long proc_freq; + unsigned short maj; + unsigned short min; + +#ifdef CONFIG_SMP + pvr = per_cpu(cpu_pvr, cpu_id); +#else + pvr = mfspr(SPRN_PVR); +#endif + maj = (pvr >> 8) & 0xFF; + min = pvr & 0xFF; + + seq_printf(m, "processor\t: %lu\ncpu\t\t: ", cpu_id); + + if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name) + seq_puts(m, cur_cpu_spec->cpu_name); + else + seq_printf(m, "unknown (%08x)", pvr); + + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + seq_puts(m, ", altivec supported"); + + seq_putc(m, '\n'); + +#ifdef CONFIG_TAU + if (cpu_has_feature(CPU_FTR_TAU)) { + if (IS_ENABLED(CONFIG_TAU_AVERAGE)) { + /* more straightforward, but potentially misleading */ + seq_printf(m, "temperature \t: %u C (uncalibrated)\n", + cpu_temp(cpu_id)); + } else { + /* show the actual temp sensor range */ + u32 temp; + temp = cpu_temp_both(cpu_id); + seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n", + temp & 0xff, temp >> 16); + } + } +#endif /* CONFIG_TAU */ + + /* + * Platforms that have variable clock rates, should implement + * the method ppc_md.get_proc_freq() that reports the clock + * rate of a given cpu. The rest can use ppc_proc_freq to + * report the clock rate that is same across all cpus. + */ + if (ppc_md.get_proc_freq) + proc_freq = ppc_md.get_proc_freq(cpu_id); + else + proc_freq = ppc_proc_freq; + + if (proc_freq) + seq_printf(m, "clock\t\t: %lu.%06luMHz\n", + proc_freq / 1000000, proc_freq % 1000000); + + /* If we are a Freescale core do a simple check so + * we don't have to keep adding cases in the future */ + if (PVR_VER(pvr) & 0x8000) { + switch (PVR_VER(pvr)) { + case 0x8000: /* 7441/7450/7451, Voyager */ + case 0x8001: /* 7445/7455, Apollo 6 */ + case 0x8002: /* 7447/7457, Apollo 7 */ + case 0x8003: /* 7447A, Apollo 7 PM */ + case 0x8004: /* 7448, Apollo 8 */ + case 0x800c: /* 7410, Nitro */ + maj = ((pvr >> 8) & 0xF); + min = PVR_MIN(pvr); + break; + default: /* e500/book-e */ + maj = PVR_MAJ(pvr); + min = PVR_MIN(pvr); + break; + } + } else { + switch (PVR_VER(pvr)) { + case 0x1008: /* 740P/750P ?? */ + maj = ((pvr >> 8) & 0xFF) - 1; + min = pvr & 0xFF; + break; + case 0x004e: /* POWER9 bits 12-15 give chip type */ + case 0x0080: /* POWER10 bit 12 gives SMT8/4 */ + maj = (pvr >> 8) & 0x0F; + min = pvr & 0xFF; + break; + default: + maj = (pvr >> 8) & 0xFF; + min = pvr & 0xFF; + break; + } + } + + seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", + maj, min, PVR_VER(pvr), PVR_REV(pvr)); + + if (IS_ENABLED(CONFIG_PPC32)) + seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ), + (loops_per_jiffy / (5000 / HZ)) % 100); + + seq_putc(m, '\n'); + + /* If this is the last cpu, print the summary */ + if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids) + show_cpuinfo_summary(m); + + return 0; +} + +static void *c_start(struct seq_file *m, loff_t *pos) +{ + if (*pos == 0) /* just in case, cpu 0 is not the first */ + *pos = cpumask_first(cpu_online_mask); + else + *pos = cpumask_next(*pos - 1, cpu_online_mask); + if ((*pos) < nr_cpu_ids) + return (void *)(unsigned long)(*pos + 1); + return NULL; +} + +static void *c_next(struct seq_file *m, void *v, loff_t *pos) +{ + (*pos)++; + return c_start(m, pos); +} + +static void c_stop(struct seq_file *m, void *v) +{ +} + +const struct seq_operations cpuinfo_op = { + .start = c_start, + .next = c_next, + .stop = c_stop, + .show = show_cpuinfo, +}; + +void __init check_for_initrd(void) +{ +#ifdef CONFIG_BLK_DEV_INITRD + DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n", + initrd_start, initrd_end); + + /* If we were passed an initrd, set the ROOT_DEV properly if the values + * look sensible. If not, clear initrd reference. + */ + if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && + initrd_end > initrd_start) + ROOT_DEV = Root_RAM0; + else + initrd_start = initrd_end = 0; + + if (initrd_start) + pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); + + DBG(" <- check_for_initrd()\n"); +#endif /* CONFIG_BLK_DEV_INITRD */ +} + +#ifdef CONFIG_SMP + +int threads_per_core, threads_per_subcore, threads_shift __read_mostly; +cpumask_t threads_core_mask __read_mostly; +EXPORT_SYMBOL_GPL(threads_per_core); +EXPORT_SYMBOL_GPL(threads_per_subcore); +EXPORT_SYMBOL_GPL(threads_shift); +EXPORT_SYMBOL_GPL(threads_core_mask); + +static void __init cpu_init_thread_core_maps(int tpc) +{ + int i; + + threads_per_core = tpc; + threads_per_subcore = tpc; + cpumask_clear(&threads_core_mask); + + /* This implementation only supports power of 2 number of threads + * for simplicity and performance + */ + threads_shift = ilog2(tpc); + BUG_ON(tpc != (1 << threads_shift)); + + for (i = 0; i < tpc; i++) + cpumask_set_cpu(i, &threads_core_mask); + + printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n", + tpc, tpc > 1 ? "s" : ""); + printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift); +} + + +u32 *cpu_to_phys_id = NULL; + +/** + * setup_cpu_maps - initialize the following cpu maps: + * cpu_possible_mask + * cpu_present_mask + * + * Having the possible map set up early allows us to restrict allocations + * of things like irqstacks to nr_cpu_ids rather than NR_CPUS. + * + * We do not initialize the online map here; cpus set their own bits in + * cpu_online_mask as they come up. + * + * This function is valid only for Open Firmware systems. finish_device_tree + * must be called before using this. + * + * While we're here, we may as well set the "physical" cpu ids in the paca. + * + * NOTE: This must match the parsing done in early_init_dt_scan_cpus. + */ +void __init smp_setup_cpu_maps(void) +{ + struct device_node *dn; + int cpu = 0; + int nthreads = 1; + + DBG("smp_setup_cpu_maps()\n"); + + cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32), + __alignof__(u32)); + if (!cpu_to_phys_id) + panic("%s: Failed to allocate %zu bytes align=0x%zx\n", + __func__, nr_cpu_ids * sizeof(u32), __alignof__(u32)); + + for_each_node_by_type(dn, "cpu") { + const __be32 *intserv; + __be32 cpu_be; + int j, len; + + DBG(" * %pOF...\n", dn); + + intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", + &len); + if (intserv) { + DBG(" ibm,ppc-interrupt-server#s -> %lu threads\n", + (len / sizeof(int))); + } else { + DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n"); + intserv = of_get_property(dn, "reg", &len); + if (!intserv) { + cpu_be = cpu_to_be32(cpu); + /* XXX: what is this? uninitialized?? */ + intserv = &cpu_be; /* assume logical == phys */ + len = 4; + } + } + + nthreads = len / sizeof(int); + + for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) { + bool avail; + + DBG(" thread %d -> cpu %d (hard id %d)\n", + j, cpu, be32_to_cpu(intserv[j])); + + avail = of_device_is_available(dn); + if (!avail) + avail = !of_property_match_string(dn, + "enable-method", "spin-table"); + + set_cpu_present(cpu, avail); + set_cpu_possible(cpu, true); + cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]); + cpu++; + } + + if (cpu >= nr_cpu_ids) { + of_node_put(dn); + break; + } + } + + /* If no SMT supported, nthreads is forced to 1 */ + if (!cpu_has_feature(CPU_FTR_SMT)) { + DBG(" SMT disabled ! nthreads forced to 1\n"); + nthreads = 1; + } + +#ifdef CONFIG_PPC64 + /* + * On pSeries LPAR, we need to know how many cpus + * could possibly be added to this partition. + */ + if (firmware_has_feature(FW_FEATURE_LPAR) && + (dn = of_find_node_by_path("/rtas"))) { + int num_addr_cell, num_size_cell, maxcpus; + const __be32 *ireg; + + num_addr_cell = of_n_addr_cells(dn); + num_size_cell = of_n_size_cells(dn); + + ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL); + + if (!ireg) + goto out; + + maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell); + + /* Double maxcpus for processors which have SMT capability */ + if (cpu_has_feature(CPU_FTR_SMT)) + maxcpus *= nthreads; + + if (maxcpus > nr_cpu_ids) { + printk(KERN_WARNING + "Partition configured for %d cpus, " + "operating system maximum is %u.\n", + maxcpus, nr_cpu_ids); + maxcpus = nr_cpu_ids; + } else + printk(KERN_INFO "Partition configured for %d cpus.\n", + maxcpus); + + for (cpu = 0; cpu < maxcpus; cpu++) + set_cpu_possible(cpu, true); + out: + of_node_put(dn); + } + vdso_data->processorCount = num_present_cpus(); +#endif /* CONFIG_PPC64 */ + + /* Initialize CPU <=> thread mapping/ + * + * WARNING: We assume that the number of threads is the same for + * every CPU in the system. If that is not the case, then some code + * here will have to be reworked + */ + cpu_init_thread_core_maps(nthreads); + + /* Now that possible cpus are set, set nr_cpu_ids for later use */ + setup_nr_cpu_ids(); + + free_unused_pacas(); +} +#endif /* CONFIG_SMP */ + +#ifdef CONFIG_PCSPKR_PLATFORM +static __init int add_pcspkr(void) +{ + struct device_node *np; + struct platform_device *pd; + int ret; + + np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); + of_node_put(np); + if (!np) + return -ENODEV; + + pd = platform_device_alloc("pcspkr", -1); + if (!pd) + return -ENOMEM; + + ret = platform_device_add(pd); + if (ret) + platform_device_put(pd); + + return ret; +} +device_initcall(add_pcspkr); +#endif /* CONFIG_PCSPKR_PLATFORM */ + +static char ppc_hw_desc_buf[128] __initdata; + +struct seq_buf ppc_hw_desc __initdata = { + .buffer = ppc_hw_desc_buf, + .size = sizeof(ppc_hw_desc_buf), + .len = 0, + .readpos = 0, +}; + +static __init void probe_machine(void) +{ + extern struct machdep_calls __machine_desc_start; + extern struct machdep_calls __machine_desc_end; + unsigned int i; + + /* + * Iterate all ppc_md structures until we find the proper + * one for the current machine type + */ + DBG("Probing machine type ...\n"); + + /* + * Check ppc_md is empty, if not we have a bug, ie, we setup an + * entry before probe_machine() which will be overwritten + */ + for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) { + if (((void **)&ppc_md)[i]) { + printk(KERN_ERR "Entry %d in ppc_md non empty before" + " machine probe !\n", i); + } + } + + for (machine_id = &__machine_desc_start; + machine_id < &__machine_desc_end; + machine_id++) { + DBG(" %s ...", machine_id->name); + memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); + if (ppc_md.probe()) { + DBG(" match !\n"); + break; + } + DBG("\n"); + } + /* What can we do if we didn't find ? */ + if (machine_id >= &__machine_desc_end) { + pr_err("No suitable machine description found !\n"); + for (;;); + } + + // Append the machine name to other info we've gathered + seq_buf_puts(&ppc_hw_desc, ppc_md.name); + + // Set the generic hardware description shown in oopses + dump_stack_set_arch_desc(ppc_hw_desc.buffer); + + pr_info("Hardware name: %s\n", ppc_hw_desc.buffer); +} + +/* Match a class of boards, not a specific device configuration. */ +int check_legacy_ioport(unsigned long base_port) +{ + struct device_node *parent, *np = NULL; + int ret = -ENODEV; + + switch(base_port) { + case I8042_DATA_REG: + if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303"))) + np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03"); + if (np) { + parent = of_get_parent(np); + + of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0); + if (!of_i8042_kbd_irq) + of_i8042_kbd_irq = 1; + + of_i8042_aux_irq = irq_of_parse_and_map(parent, 1); + if (!of_i8042_aux_irq) + of_i8042_aux_irq = 12; + + of_node_put(np); + np = parent; + break; + } + np = of_find_node_by_type(NULL, "8042"); + /* Pegasos has no device_type on its 8042 node, look for the + * name instead */ + if (!np) + np = of_find_node_by_name(NULL, "8042"); + if (np) { + of_i8042_kbd_irq = 1; + of_i8042_aux_irq = 12; + } + break; + case FDC_BASE: /* FDC1 */ + np = of_find_node_by_type(NULL, "fdc"); + break; + default: + /* ipmi is supposed to fail here */ + break; + } + if (!np) + return ret; + parent = of_get_parent(np); + if (parent) { + if (of_node_is_type(parent, "isa")) + ret = 0; + of_node_put(parent); + } + of_node_put(np); + return ret; +} +EXPORT_SYMBOL(check_legacy_ioport); + +/* + * Panic notifiers setup + * + * We have 3 notifiers for powerpc, each one from a different "nature": + * + * - ppc_panic_fadump_handler() is a hypervisor notifier, which hard-disables + * IRQs and deal with the Firmware-Assisted dump, when it is configured; + * should run early in the panic path. + * + * - dump_kernel_offset() is an informative notifier, just showing the KASLR + * offset if we have RANDOMIZE_BASE set. + * + * - ppc_panic_platform_handler() is a low-level handler that's registered + * only if the platform wishes to perform final actions in the panic path, + * hence it should run late and might not even return. Currently, only + * pseries and ps3 platforms register callbacks. + */ +static int ppc_panic_fadump_handler(struct notifier_block *this, + unsigned long event, void *ptr) +{ + /* + * panic does a local_irq_disable, but we really + * want interrupts to be hard disabled. + */ + hard_irq_disable(); + + /* + * If firmware-assisted dump has been registered then trigger + * its callback and let the firmware handles everything else. + */ + crash_fadump(NULL, ptr); + + return NOTIFY_DONE; +} + +static int dump_kernel_offset(struct notifier_block *self, unsigned long v, + void *p) +{ + pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n", + kaslr_offset(), KERNELBASE); + + return NOTIFY_DONE; +} + +static int ppc_panic_platform_handler(struct notifier_block *this, + unsigned long event, void *ptr) +{ + /* + * This handler is only registered if we have a panic callback + * on ppc_md, hence NULL check is not needed. + * Also, it may not return, so it runs really late on panic path. + */ + ppc_md.panic(ptr); + + return NOTIFY_DONE; +} + +static struct notifier_block ppc_fadump_block = { + .notifier_call = ppc_panic_fadump_handler, + .priority = INT_MAX, /* run early, to notify the firmware ASAP */ +}; + +static struct notifier_block kernel_offset_notifier = { + .notifier_call = dump_kernel_offset, +}; + +static struct notifier_block ppc_panic_block = { + .notifier_call = ppc_panic_platform_handler, + .priority = INT_MIN, /* may not return; must be done last */ +}; + +void __init setup_panic(void) +{ + /* Hard-disables IRQs + deal with FW-assisted dump (fadump) */ + atomic_notifier_chain_register(&panic_notifier_list, + &ppc_fadump_block); + + if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0) + atomic_notifier_chain_register(&panic_notifier_list, + &kernel_offset_notifier); + + /* Low-level platform-specific routines that should run on panic */ + if (ppc_md.panic) + atomic_notifier_chain_register(&panic_notifier_list, + &ppc_panic_block); +} + +#ifdef CONFIG_CHECK_CACHE_COHERENCY +/* + * For platforms that have configurable cache-coherency. This function + * checks that the cache coherency setting of the kernel matches the setting + * left by the firmware, as indicated in the device tree. Since a mismatch + * will eventually result in DMA failures, we print * and error and call + * BUG() in that case. + */ + +#define KERNEL_COHERENCY (!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE)) + +static int __init check_cache_coherency(void) +{ + struct device_node *np; + const void *prop; + bool devtree_coherency; + + np = of_find_node_by_path("/"); + prop = of_get_property(np, "coherency-off", NULL); + of_node_put(np); + + devtree_coherency = prop ? false : true; + + if (devtree_coherency != KERNEL_COHERENCY) { + printk(KERN_ERR + "kernel coherency:%s != device tree_coherency:%s\n", + KERNEL_COHERENCY ? "on" : "off", + devtree_coherency ? "on" : "off"); + BUG(); + } + + return 0; +} + +late_initcall(check_cache_coherency); +#endif /* CONFIG_CHECK_CACHE_COHERENCY */ + +void ppc_printk_progress(char *s, unsigned short hex) +{ + pr_info("%s\n", s); +} + +static __init void print_system_info(void) +{ + pr_info("-----------------------------------------------------\n"); + pr_info("phys_mem_size = 0x%llx\n", + (unsigned long long)memblock_phys_mem_size()); + + pr_info("dcache_bsize = 0x%x\n", dcache_bsize); + pr_info("icache_bsize = 0x%x\n", icache_bsize); + + pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features); + pr_info(" possible = 0x%016lx\n", + (unsigned long)CPU_FTRS_POSSIBLE); + pr_info(" always = 0x%016lx\n", + (unsigned long)CPU_FTRS_ALWAYS); + pr_info("cpu_user_features = 0x%08x 0x%08x\n", + cur_cpu_spec->cpu_user_features, + cur_cpu_spec->cpu_user_features2); + pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features); +#ifdef CONFIG_PPC64 + pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features); +#ifdef CONFIG_PPC_BOOK3S + pr_info("vmalloc start = 0x%lx\n", KERN_VIRT_START); + pr_info("IO start = 0x%lx\n", KERN_IO_START); + pr_info("vmemmap start = 0x%lx\n", (unsigned long)vmemmap); +#endif +#endif + + if (!early_radix_enabled()) + print_system_hash_info(); + + if (PHYSICAL_START > 0) + pr_info("physical_start = 0x%llx\n", + (unsigned long long)PHYSICAL_START); + pr_info("-----------------------------------------------------\n"); +} + +#ifdef CONFIG_SMP +static void __init smp_setup_pacas(void) +{ + int cpu; + + for_each_possible_cpu(cpu) { + if (cpu == smp_processor_id()) + continue; + allocate_paca(cpu); + set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]); + } + + memblock_free(cpu_to_phys_id, nr_cpu_ids * sizeof(u32)); + cpu_to_phys_id = NULL; +} +#endif + +/* + * Called into from start_kernel this initializes memblock, which is used + * to manage page allocation until mem_init is called. + */ +void __init setup_arch(char **cmdline_p) +{ + kasan_init(); + + *cmdline_p = boot_command_line; + + /* Set a half-reasonable default so udelay does something sensible */ + loops_per_jiffy = 500000000 / HZ; + + /* Unflatten the device-tree passed by prom_init or kexec */ + unflatten_device_tree(); + + /* + * Initialize cache line/block info from device-tree (on ppc64) or + * just cputable (on ppc32). + */ + initialize_cache_info(); + + /* Initialize RTAS if available. */ + rtas_initialize(); + + /* Check if we have an initrd provided via the device-tree. */ + check_for_initrd(); + + /* Probe the machine type, establish ppc_md. */ + probe_machine(); + + /* Setup panic notifier if requested by the platform. */ + setup_panic(); + + /* + * Configure ppc_md.power_save (ppc32 only, 64-bit machines do + * it from their respective probe() function. + */ + setup_power_save(); + + /* Discover standard serial ports. */ + find_legacy_serial_ports(); + + /* Register early console with the printk subsystem. */ + register_early_udbg_console(); + + /* Setup the various CPU maps based on the device-tree. */ + smp_setup_cpu_maps(); + + /* Initialize xmon. */ + xmon_setup(); + + /* Check the SMT related command line arguments (ppc64). */ + check_smt_enabled(); + + /* Parse memory topology */ + mem_topology_setup(); + /* Set max_mapnr before paging_init() */ + set_max_mapnr(max_pfn); + + /* + * Release secondary cpus out of their spinloops at 0x60 now that + * we can map physical -> logical CPU ids. + * + * Freescale Book3e parts spin in a loop provided by firmware, + * so smp_release_cpus() does nothing for them. + */ +#ifdef CONFIG_SMP + smp_setup_pacas(); + + /* On BookE, setup per-core TLB data structures. */ + setup_tlb_core_data(); +#endif + + /* Print various info about the machine that has been gathered so far. */ + print_system_info(); + + klp_init_thread_info(&init_task); + + setup_initial_init_mm(_stext, _etext, _edata, _end); + + mm_iommu_init(&init_mm); + irqstack_early_init(); + exc_lvl_early_init(); + emergency_stack_init(); + + mce_init(); + smp_release_cpus(); + + initmem_init(); + + /* + * Reserve large chunks of memory for use by CMA for KVM and hugetlb. These must + * be called after initmem_init(), so that pageblock_order is initialised. + */ + kvm_cma_reserve(); + gigantic_hugetlb_cma_reserve(); + + early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT); + + if (ppc_md.setup_arch) + ppc_md.setup_arch(); + + setup_barrier_nospec(); + setup_spectre_v2(); + + paging_init(); + + /* Initialize the MMU context management stuff. */ + mmu_context_init(); + + /* Interrupt code needs to be 64K-aligned. */ + if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff) + panic("Kernelbase not 64K-aligned (0x%lx)!\n", + (unsigned long)_stext); +} diff --git a/arch/powerpc/kernel/setup.h b/arch/powerpc/kernel/setup.h new file mode 100644 index 000000000..7912bb50a --- /dev/null +++ b/arch/powerpc/kernel/setup.h @@ -0,0 +1,67 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Prototypes for functions that are shared between setup_(32|64|common).c + * + * Copyright 2016 Michael Ellerman, IBM Corporation. + */ + +#ifndef __ARCH_POWERPC_KERNEL_SETUP_H +#define __ARCH_POWERPC_KERNEL_SETUP_H + +void initialize_cache_info(void); +void irqstack_early_init(void); + +#ifdef CONFIG_PPC32 +void setup_power_save(void); +#else +static inline void setup_power_save(void) { } +#endif + +#if defined(CONFIG_PPC64) && defined(CONFIG_SMP) +void check_smt_enabled(void); +#else +static inline void check_smt_enabled(void) { } +#endif + +#if defined(CONFIG_PPC_BOOK3E_64) && defined(CONFIG_SMP) +void setup_tlb_core_data(void); +#else +static inline void setup_tlb_core_data(void) { } +#endif + +#ifdef CONFIG_BOOKE_OR_40x +void exc_lvl_early_init(void); +#else +static inline void exc_lvl_early_init(void) { } +#endif + +#if defined(CONFIG_PPC64) || defined(CONFIG_VMAP_STACK) +void emergency_stack_init(void); +#else +static inline void emergency_stack_init(void) { } +#endif + +#ifdef CONFIG_PPC64 +u64 ppc64_bolted_size(void); + +/* Default SPR values from firmware/kexec */ +extern unsigned long spr_default_dscr; +#endif + +/* + * Having this in kvm_ppc.h makes include dependencies too + * tricky to solve for setup-common.c so have it here. + */ +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE +void kvm_cma_reserve(void); +#else +static inline void kvm_cma_reserve(void) { } +#endif + +#ifdef CONFIG_TAU +u32 cpu_temp(unsigned long cpu); +u32 cpu_temp_both(unsigned long cpu); +u32 tau_interrupts(unsigned long cpu); +#endif /* CONFIG_TAU */ + +#endif /* __ARCH_POWERPC_KERNEL_SETUP_H */ diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c new file mode 100644 index 000000000..b761cc1a4 --- /dev/null +++ b/arch/powerpc/kernel/setup_32.c @@ -0,0 +1,226 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Common prep/pmac/chrp boot and setup code. + */ + +#include <linux/module.h> +#include <linux/string.h> +#include <linux/sched.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/reboot.h> +#include <linux/delay.h> +#include <linux/initrd.h> +#include <linux/tty.h> +#include <linux/seq_file.h> +#include <linux/root_dev.h> +#include <linux/cpu.h> +#include <linux/console.h> +#include <linux/memblock.h> +#include <linux/export.h> +#include <linux/nvram.h> +#include <linux/pgtable.h> +#include <linux/of_fdt.h> +#include <linux/irq.h> + +#include <asm/io.h> +#include <asm/processor.h> +#include <asm/setup.h> +#include <asm/smp.h> +#include <asm/elf.h> +#include <asm/cputable.h> +#include <asm/bootx.h> +#include <asm/btext.h> +#include <asm/machdep.h> +#include <linux/uaccess.h> +#include <asm/pmac_feature.h> +#include <asm/sections.h> +#include <asm/nvram.h> +#include <asm/xmon.h> +#include <asm/time.h> +#include <asm/serial.h> +#include <asm/udbg.h> +#include <asm/code-patching.h> +#include <asm/cpu_has_feature.h> +#include <asm/asm-prototypes.h> +#include <asm/kdump.h> +#include <asm/feature-fixups.h> +#include <asm/early_ioremap.h> + +#include "setup.h" + +#define DBG(fmt...) + +extern void bootx_init(unsigned long r4, unsigned long phys); + +int boot_cpuid_phys; +EXPORT_SYMBOL_GPL(boot_cpuid_phys); + +int smp_hw_index[NR_CPUS]; +EXPORT_SYMBOL(smp_hw_index); + +unsigned int DMA_MODE_READ; +unsigned int DMA_MODE_WRITE; + +EXPORT_SYMBOL(DMA_MODE_READ); +EXPORT_SYMBOL(DMA_MODE_WRITE); + +/* + * This is run before start_kernel(), the kernel has been relocated + * and we are running with enough of the MMU enabled to have our + * proper kernel virtual addresses + * + * We do the initial parsing of the flat device-tree and prepares + * for the MMU to be fully initialized. + */ +notrace void __init machine_init(u64 dt_ptr) +{ + u32 *addr = (u32 *)patch_site_addr(&patch__memset_nocache); + ppc_inst_t insn; + + /* Configure static keys first, now that we're relocated. */ + setup_feature_keys(); + + early_ioremap_init(); + + /* Enable early debugging if any specified (see udbg.h) */ + udbg_early_init(); + + patch_instruction_site(&patch__memcpy_nocache, ppc_inst(PPC_RAW_NOP())); + + create_cond_branch(&insn, addr, branch_target(addr), 0x820000); + patch_instruction(addr, insn); /* replace b by bne cr0 */ + + /* Do some early initialization based on the flat device tree */ + early_init_devtree(__va(dt_ptr)); + + early_init_mmu(); + + setup_kdump_trampoline(); +} + +/* Checks "l2cr=xxxx" command-line option */ +static int __init ppc_setup_l2cr(char *str) +{ + if (cpu_has_feature(CPU_FTR_L2CR)) { + unsigned long val = simple_strtoul(str, NULL, 0); + printk(KERN_INFO "l2cr set to %lx\n", val); + _set_L2CR(0); /* force invalidate by disable cache */ + _set_L2CR(val); /* and enable it */ + } + return 1; +} +__setup("l2cr=", ppc_setup_l2cr); + +/* Checks "l3cr=xxxx" command-line option */ +static int __init ppc_setup_l3cr(char *str) +{ + if (cpu_has_feature(CPU_FTR_L3CR)) { + unsigned long val = simple_strtoul(str, NULL, 0); + printk(KERN_INFO "l3cr set to %lx\n", val); + _set_L3CR(val); /* and enable it */ + } + return 1; +} +__setup("l3cr=", ppc_setup_l3cr); + +static int __init ppc_init(void) +{ + /* clear the progress line */ + if (ppc_md.progress) + ppc_md.progress(" ", 0xffff); + + /* call platform init */ + if (ppc_md.init != NULL) { + ppc_md.init(); + } + return 0; +} +arch_initcall(ppc_init); + +static void *__init alloc_stack(void) +{ + void *ptr = memblock_alloc(THREAD_SIZE, THREAD_ALIGN); + + if (!ptr) + panic("cannot allocate %d bytes for stack at %pS\n", + THREAD_SIZE, (void *)_RET_IP_); + + return ptr; +} + +void __init irqstack_early_init(void) +{ + unsigned int i; + + if (IS_ENABLED(CONFIG_VMAP_STACK)) + return; + + /* interrupt stacks must be in lowmem, we get that for free on ppc32 + * as the memblock is limited to lowmem by default */ + for_each_possible_cpu(i) { + softirq_ctx[i] = alloc_stack(); + hardirq_ctx[i] = alloc_stack(); + } +} + +#ifdef CONFIG_VMAP_STACK +void *emergency_ctx[NR_CPUS] __ro_after_init = {[0] = &init_stack}; + +void __init emergency_stack_init(void) +{ + unsigned int i; + + for_each_possible_cpu(i) + emergency_ctx[i] = alloc_stack(); +} +#endif + +#ifdef CONFIG_BOOKE_OR_40x +void __init exc_lvl_early_init(void) +{ + unsigned int i, hw_cpu; + + /* interrupt stacks must be in lowmem, we get that for free on ppc32 + * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */ + for_each_possible_cpu(i) { +#ifdef CONFIG_SMP + hw_cpu = get_hard_smp_processor_id(i); +#else + hw_cpu = 0; +#endif + + critirq_ctx[hw_cpu] = alloc_stack(); +#ifdef CONFIG_BOOKE + dbgirq_ctx[hw_cpu] = alloc_stack(); + mcheckirq_ctx[hw_cpu] = alloc_stack(); +#endif + } +} +#endif + +void __init setup_power_save(void) +{ +#ifdef CONFIG_PPC_BOOK3S_32 + if (cpu_has_feature(CPU_FTR_CAN_DOZE) || + cpu_has_feature(CPU_FTR_CAN_NAP)) + ppc_md.power_save = ppc6xx_idle; +#endif + +#ifdef CONFIG_PPC_E500 + if (cpu_has_feature(CPU_FTR_CAN_DOZE) || + cpu_has_feature(CPU_FTR_CAN_NAP)) + ppc_md.power_save = e500_idle; +#endif +} + +__init void initialize_cache_info(void) +{ + /* + * Set cache line size based on type of cpu as a default. + * Systems with OF can look in the properties on the cpu node(s) + * for a possibly more accurate value. + */ + dcache_bsize = cur_cpu_spec->dcache_bsize; + icache_bsize = cur_cpu_spec->icache_bsize; +} diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c new file mode 100644 index 000000000..b2e0d3ce4 --- /dev/null +++ b/arch/powerpc/kernel/setup_64.c @@ -0,0 +1,932 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * + * Common boot and setup code. + * + * Copyright (C) 2001 PPC64 Team, IBM Corp + */ + +#include <linux/export.h> +#include <linux/string.h> +#include <linux/sched.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/reboot.h> +#include <linux/delay.h> +#include <linux/initrd.h> +#include <linux/seq_file.h> +#include <linux/ioport.h> +#include <linux/console.h> +#include <linux/utsname.h> +#include <linux/tty.h> +#include <linux/root_dev.h> +#include <linux/notifier.h> +#include <linux/cpu.h> +#include <linux/unistd.h> +#include <linux/serial.h> +#include <linux/serial_8250.h> +#include <linux/memblock.h> +#include <linux/pci.h> +#include <linux/lockdep.h> +#include <linux/memory.h> +#include <linux/nmi.h> +#include <linux/pgtable.h> +#include <linux/of.h> +#include <linux/of_fdt.h> + +#include <asm/asm-prototypes.h> +#include <asm/kvm_guest.h> +#include <asm/io.h> +#include <asm/kdump.h> +#include <asm/processor.h> +#include <asm/smp.h> +#include <asm/elf.h> +#include <asm/machdep.h> +#include <asm/paca.h> +#include <asm/time.h> +#include <asm/cputable.h> +#include <asm/dt_cpu_ftrs.h> +#include <asm/sections.h> +#include <asm/btext.h> +#include <asm/nvram.h> +#include <asm/setup.h> +#include <asm/rtas.h> +#include <asm/iommu.h> +#include <asm/serial.h> +#include <asm/cache.h> +#include <asm/page.h> +#include <asm/mmu.h> +#include <asm/firmware.h> +#include <asm/xmon.h> +#include <asm/udbg.h> +#include <asm/kexec.h> +#include <asm/code-patching.h> +#include <asm/ftrace.h> +#include <asm/opal.h> +#include <asm/cputhreads.h> +#include <asm/hw_irq.h> +#include <asm/feature-fixups.h> +#include <asm/kup.h> +#include <asm/early_ioremap.h> +#include <asm/pgalloc.h> + +#include "setup.h" + +int spinning_secondaries; +u64 ppc64_pft_size; + +struct ppc64_caches ppc64_caches = { + .l1d = { + .block_size = 0x40, + .log_block_size = 6, + }, + .l1i = { + .block_size = 0x40, + .log_block_size = 6 + }, +}; +EXPORT_SYMBOL_GPL(ppc64_caches); + +#if defined(CONFIG_PPC_BOOK3E_64) && defined(CONFIG_SMP) +void __init setup_tlb_core_data(void) +{ + int cpu; + + BUILD_BUG_ON(offsetof(struct tlb_core_data, lock) != 0); + + for_each_possible_cpu(cpu) { + int first = cpu_first_thread_sibling(cpu); + + /* + * If we boot via kdump on a non-primary thread, + * make sure we point at the thread that actually + * set up this TLB. + */ + if (cpu_first_thread_sibling(boot_cpuid) == first) + first = boot_cpuid; + + paca_ptrs[cpu]->tcd_ptr = &paca_ptrs[first]->tcd; + + /* + * If we have threads, we need either tlbsrx. + * or e6500 tablewalk mode, or else TLB handlers + * will be racy and could produce duplicate entries. + * Should we panic instead? + */ + WARN_ONCE(smt_enabled_at_boot >= 2 && + book3e_htw_mode != PPC_HTW_E6500, + "%s: unsupported MMU configuration\n", __func__); + } +} +#endif + +#ifdef CONFIG_SMP + +static char *smt_enabled_cmdline; + +/* Look for ibm,smt-enabled OF option */ +void __init check_smt_enabled(void) +{ + struct device_node *dn; + const char *smt_option; + + /* Default to enabling all threads */ + smt_enabled_at_boot = threads_per_core; + + /* Allow the command line to overrule the OF option */ + if (smt_enabled_cmdline) { + if (!strcmp(smt_enabled_cmdline, "on")) + smt_enabled_at_boot = threads_per_core; + else if (!strcmp(smt_enabled_cmdline, "off")) + smt_enabled_at_boot = 0; + else { + int smt; + int rc; + + rc = kstrtoint(smt_enabled_cmdline, 10, &smt); + if (!rc) + smt_enabled_at_boot = + min(threads_per_core, smt); + } + } else { + dn = of_find_node_by_path("/options"); + if (dn) { + smt_option = of_get_property(dn, "ibm,smt-enabled", + NULL); + + if (smt_option) { + if (!strcmp(smt_option, "on")) + smt_enabled_at_boot = threads_per_core; + else if (!strcmp(smt_option, "off")) + smt_enabled_at_boot = 0; + } + + of_node_put(dn); + } + } +} + +/* Look for smt-enabled= cmdline option */ +static int __init early_smt_enabled(char *p) +{ + smt_enabled_cmdline = p; + return 0; +} +early_param("smt-enabled", early_smt_enabled); + +#endif /* CONFIG_SMP */ + +/** Fix up paca fields required for the boot cpu */ +static void __init fixup_boot_paca(struct paca_struct *boot_paca) +{ + /* The boot cpu is started */ + boot_paca->cpu_start = 1; +#ifdef CONFIG_PPC_BOOK3S_64 + /* + * Give the early boot machine check stack somewhere to use, use + * half of the init stack. This is a bit hacky but there should not be + * deep stack usage in early init so shouldn't overflow it or overwrite + * things. + */ + boot_paca->mc_emergency_sp = (void *)&init_thread_union + + (THREAD_SIZE/2); +#endif + /* Allow percpu accesses to work until we setup percpu data */ + boot_paca->data_offset = 0; + /* Mark interrupts soft and hard disabled in PACA */ + boot_paca->irq_soft_mask = IRQS_DISABLED; + boot_paca->irq_happened = PACA_IRQ_HARD_DIS; + WARN_ON(mfmsr() & MSR_EE); +} + +static void __init configure_exceptions(void) +{ + /* + * Setup the trampolines from the lowmem exception vectors + * to the kdump kernel when not using a relocatable kernel. + */ + setup_kdump_trampoline(); + + /* Under a PAPR hypervisor, we need hypercalls */ + if (firmware_has_feature(FW_FEATURE_SET_MODE)) { + /* + * - PR KVM does not support AIL mode interrupts in the host + * while a PR guest is running. + * + * - SCV system call interrupt vectors are only implemented for + * AIL mode interrupts. + * + * - On pseries, AIL mode can only be enabled and disabled + * system-wide so when a PR VM is created on a pseries host, + * all CPUs of the host are set to AIL=0 mode. + * + * - Therefore host CPUs must not execute scv while a PR VM + * exists. + * + * - SCV support can not be disabled dynamically because the + * feature is advertised to host userspace. Disabling the + * facility and emulating it would be possible but is not + * implemented. + * + * - So SCV support is blanket disabled if PR KVM could possibly + * run. That is, PR support compiled in, booting on pseries + * with hash MMU. + */ + if (IS_ENABLED(CONFIG_KVM_BOOK3S_PR_POSSIBLE) && !radix_enabled()) { + init_task.thread.fscr &= ~FSCR_SCV; + cur_cpu_spec->cpu_user_features2 &= ~PPC_FEATURE2_SCV; + } + + /* Enable AIL if possible */ + if (!pseries_enable_reloc_on_exc()) { + init_task.thread.fscr &= ~FSCR_SCV; + cur_cpu_spec->cpu_user_features2 &= ~PPC_FEATURE2_SCV; + } + + /* + * Tell the hypervisor that we want our exceptions to + * be taken in little endian mode. + * + * We don't call this for big endian as our calling convention + * makes us always enter in BE, and the call may fail under + * some circumstances with kdump. + */ +#ifdef __LITTLE_ENDIAN__ + pseries_little_endian_exceptions(); +#endif + } else { + /* Set endian mode using OPAL */ + if (firmware_has_feature(FW_FEATURE_OPAL)) + opal_configure_cores(); + + /* AIL on native is done in cpu_ready_for_interrupts() */ + } +} + +static void cpu_ready_for_interrupts(void) +{ + /* + * Enable AIL if supported, and we are in hypervisor mode. This + * is called once for every processor. + * + * If we are not in hypervisor mode the job is done once for + * the whole partition in configure_exceptions(). + */ + if (cpu_has_feature(CPU_FTR_HVMODE)) { + unsigned long lpcr = mfspr(SPRN_LPCR); + unsigned long new_lpcr = lpcr; + + if (cpu_has_feature(CPU_FTR_ARCH_31)) { + /* P10 DD1 does not have HAIL */ + if (pvr_version_is(PVR_POWER10) && + (mfspr(SPRN_PVR) & 0xf00) == 0x100) + new_lpcr |= LPCR_AIL_3; + else + new_lpcr |= LPCR_HAIL; + } else if (cpu_has_feature(CPU_FTR_ARCH_207S)) { + new_lpcr |= LPCR_AIL_3; + } + + if (new_lpcr != lpcr) + mtspr(SPRN_LPCR, new_lpcr); + } + + /* + * Set HFSCR:TM based on CPU features: + * In the special case of TM no suspend (P9N DD2.1), Linux is + * told TM is off via the dt-ftrs but told to (partially) use + * it via OPAL_REINIT_CPUS_TM_SUSPEND_DISABLED. So HFSCR[TM] + * will be off from dt-ftrs but we need to turn it on for the + * no suspend case. + */ + if (cpu_has_feature(CPU_FTR_HVMODE)) { + if (cpu_has_feature(CPU_FTR_TM_COMP)) + mtspr(SPRN_HFSCR, mfspr(SPRN_HFSCR) | HFSCR_TM); + else + mtspr(SPRN_HFSCR, mfspr(SPRN_HFSCR) & ~HFSCR_TM); + } + + /* Set IR and DR in PACA MSR */ + get_paca()->kernel_msr = MSR_KERNEL; +} + +unsigned long spr_default_dscr = 0; + +static void __init record_spr_defaults(void) +{ + if (early_cpu_has_feature(CPU_FTR_DSCR)) + spr_default_dscr = mfspr(SPRN_DSCR); +} + +/* + * Early initialization entry point. This is called by head.S + * with MMU translation disabled. We rely on the "feature" of + * the CPU that ignores the top 2 bits of the address in real + * mode so we can access kernel globals normally provided we + * only toy with things in the RMO region. From here, we do + * some early parsing of the device-tree to setup out MEMBLOCK + * data structures, and allocate & initialize the hash table + * and segment tables so we can start running with translation + * enabled. + * + * It is this function which will call the probe() callback of + * the various platform types and copy the matching one to the + * global ppc_md structure. Your platform can eventually do + * some very early initializations from the probe() routine, but + * this is not recommended, be very careful as, for example, the + * device-tree is not accessible via normal means at this point. + */ + +void __init early_setup(unsigned long dt_ptr) +{ + static __initdata struct paca_struct boot_paca; + + /* -------- printk is _NOT_ safe to use here ! ------- */ + + /* + * Assume we're on cpu 0 for now. + * + * We need to load a PACA very early for a few reasons. + * + * The stack protector canary is stored in the paca, so as soon as we + * call any stack protected code we need r13 pointing somewhere valid. + * + * If we are using kcov it will call in_task() in its instrumentation, + * which relies on the current task from the PACA. + * + * dt_cpu_ftrs_init() calls into generic OF/fdt code, as well as + * printk(), which can trigger both stack protector and kcov. + * + * percpu variables and spin locks also use the paca. + * + * So set up a temporary paca. It will be replaced below once we know + * what CPU we are on. + */ + initialise_paca(&boot_paca, 0); + fixup_boot_paca(&boot_paca); + WARN_ON(local_paca != 0); + setup_paca(&boot_paca); /* install the paca into registers */ + + /* -------- printk is now safe to use ------- */ + + if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && (mfmsr() & MSR_HV)) + enable_machine_check(); + + /* Try new device tree based feature discovery ... */ + if (!dt_cpu_ftrs_init(__va(dt_ptr))) + /* Otherwise use the old style CPU table */ + identify_cpu(0, mfspr(SPRN_PVR)); + + /* Enable early debugging if any specified (see udbg.h) */ + udbg_early_init(); + + udbg_printf(" -> %s(), dt_ptr: 0x%lx\n", __func__, dt_ptr); + + /* + * Do early initialization using the flattened device + * tree, such as retrieving the physical memory map or + * calculating/retrieving the hash table size, discover + * boot_cpuid and boot_cpu_hwid. + */ + early_init_devtree(__va(dt_ptr)); + + allocate_paca_ptrs(); + allocate_paca(boot_cpuid); + set_hard_smp_processor_id(boot_cpuid, boot_cpu_hwid); + fixup_boot_paca(paca_ptrs[boot_cpuid]); + setup_paca(paca_ptrs[boot_cpuid]); /* install the paca into registers */ + // smp_processor_id() now reports boot_cpuid + +#ifdef CONFIG_SMP + task_thread_info(current)->cpu = boot_cpuid; // fix task_cpu(current) +#endif + + /* + * Configure exception handlers. This include setting up trampolines + * if needed, setting exception endian mode, etc... + */ + configure_exceptions(); + + /* + * Configure Kernel Userspace Protection. This needs to happen before + * feature fixups for platforms that implement this using features. + */ + setup_kup(); + + /* Apply all the dynamic patching */ + apply_feature_fixups(); + setup_feature_keys(); + + /* Initialize the hash table or TLB handling */ + early_init_mmu(); + + early_ioremap_setup(); + + /* + * After firmware and early platform setup code has set things up, + * we note the SPR values for configurable control/performance + * registers, and use those as initial defaults. + */ + record_spr_defaults(); + + /* + * At this point, we can let interrupts switch to virtual mode + * (the MMU has been setup), so adjust the MSR in the PACA to + * have IR and DR set and enable AIL if it exists + */ + cpu_ready_for_interrupts(); + + /* + * We enable ftrace here, but since we only support DYNAMIC_FTRACE, it + * will only actually get enabled on the boot cpu much later once + * ftrace itself has been initialized. + */ + this_cpu_enable_ftrace(); + + udbg_printf(" <- %s()\n", __func__); + +#ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX + /* + * This needs to be done *last* (after the above udbg_printf() even) + * + * Right after we return from this function, we turn on the MMU + * which means the real-mode access trick that btext does will + * no longer work, it needs to switch to using a real MMU + * mapping. This call will ensure that it does + */ + btext_map(); +#endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */ +} + +#ifdef CONFIG_SMP +void early_setup_secondary(void) +{ + /* Mark interrupts disabled in PACA */ + irq_soft_mask_set(IRQS_DISABLED); + + /* Initialize the hash table or TLB handling */ + early_init_mmu_secondary(); + + /* Perform any KUP setup that is per-cpu */ + setup_kup(); + + /* + * At this point, we can let interrupts switch to virtual mode + * (the MMU has been setup), so adjust the MSR in the PACA to + * have IR and DR set. + */ + cpu_ready_for_interrupts(); +} + +#endif /* CONFIG_SMP */ + +void panic_smp_self_stop(void) +{ + hard_irq_disable(); + spin_begin(); + while (1) + spin_cpu_relax(); +} + +#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC_CORE) +static bool use_spinloop(void) +{ + if (IS_ENABLED(CONFIG_PPC_BOOK3S)) { + /* + * See comments in head_64.S -- not all platforms insert + * secondaries at __secondary_hold and wait at the spin + * loop. + */ + if (firmware_has_feature(FW_FEATURE_OPAL)) + return false; + return true; + } + + /* + * When book3e boots from kexec, the ePAPR spin table does + * not get used. + */ + return of_property_read_bool(of_chosen, "linux,booted-from-kexec"); +} + +void smp_release_cpus(void) +{ + unsigned long *ptr; + int i; + + if (!use_spinloop()) + return; + + /* All secondary cpus are spinning on a common spinloop, release them + * all now so they can start to spin on their individual paca + * spinloops. For non SMP kernels, the secondary cpus never get out + * of the common spinloop. + */ + + ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop + - PHYSICAL_START); + *ptr = ppc_function_entry(generic_secondary_smp_init); + + /* And wait a bit for them to catch up */ + for (i = 0; i < 100000; i++) { + mb(); + HMT_low(); + if (spinning_secondaries == 0) + break; + udelay(1); + } + pr_debug("spinning_secondaries = %d\n", spinning_secondaries); +} +#endif /* CONFIG_SMP || CONFIG_KEXEC_CORE */ + +/* + * Initialize some remaining members of the ppc64_caches and systemcfg + * structures + * (at least until we get rid of them completely). This is mostly some + * cache informations about the CPU that will be used by cache flush + * routines and/or provided to userland + */ + +static void __init init_cache_info(struct ppc_cache_info *info, u32 size, u32 lsize, + u32 bsize, u32 sets) +{ + info->size = size; + info->sets = sets; + info->line_size = lsize; + info->block_size = bsize; + info->log_block_size = __ilog2(bsize); + if (bsize) + info->blocks_per_page = PAGE_SIZE / bsize; + else + info->blocks_per_page = 0; + + if (sets == 0) + info->assoc = 0xffff; + else + info->assoc = size / (sets * lsize); +} + +static bool __init parse_cache_info(struct device_node *np, + bool icache, + struct ppc_cache_info *info) +{ + static const char *ipropnames[] __initdata = { + "i-cache-size", + "i-cache-sets", + "i-cache-block-size", + "i-cache-line-size", + }; + static const char *dpropnames[] __initdata = { + "d-cache-size", + "d-cache-sets", + "d-cache-block-size", + "d-cache-line-size", + }; + const char **propnames = icache ? ipropnames : dpropnames; + const __be32 *sizep, *lsizep, *bsizep, *setsp; + u32 size, lsize, bsize, sets; + bool success = true; + + size = 0; + sets = -1u; + lsize = bsize = cur_cpu_spec->dcache_bsize; + sizep = of_get_property(np, propnames[0], NULL); + if (sizep != NULL) + size = be32_to_cpu(*sizep); + setsp = of_get_property(np, propnames[1], NULL); + if (setsp != NULL) + sets = be32_to_cpu(*setsp); + bsizep = of_get_property(np, propnames[2], NULL); + lsizep = of_get_property(np, propnames[3], NULL); + if (bsizep == NULL) + bsizep = lsizep; + if (lsizep == NULL) + lsizep = bsizep; + if (lsizep != NULL) + lsize = be32_to_cpu(*lsizep); + if (bsizep != NULL) + bsize = be32_to_cpu(*bsizep); + if (sizep == NULL || bsizep == NULL || lsizep == NULL) + success = false; + + /* + * OF is weird .. it represents fully associative caches + * as "1 way" which doesn't make much sense and doesn't + * leave room for direct mapped. We'll assume that 0 + * in OF means direct mapped for that reason. + */ + if (sets == 1) + sets = 0; + else if (sets == 0) + sets = 1; + + init_cache_info(info, size, lsize, bsize, sets); + + return success; +} + +void __init initialize_cache_info(void) +{ + struct device_node *cpu = NULL, *l2, *l3 = NULL; + u32 pvr; + + /* + * All shipping POWER8 machines have a firmware bug that + * puts incorrect information in the device-tree. This will + * be (hopefully) fixed for future chips but for now hard + * code the values if we are running on one of these + */ + pvr = PVR_VER(mfspr(SPRN_PVR)); + if (pvr == PVR_POWER8 || pvr == PVR_POWER8E || + pvr == PVR_POWER8NVL) { + /* size lsize blk sets */ + init_cache_info(&ppc64_caches.l1i, 0x8000, 128, 128, 32); + init_cache_info(&ppc64_caches.l1d, 0x10000, 128, 128, 64); + init_cache_info(&ppc64_caches.l2, 0x80000, 128, 0, 512); + init_cache_info(&ppc64_caches.l3, 0x800000, 128, 0, 8192); + } else + cpu = of_find_node_by_type(NULL, "cpu"); + + /* + * We're assuming *all* of the CPUs have the same + * d-cache and i-cache sizes... -Peter + */ + if (cpu) { + if (!parse_cache_info(cpu, false, &ppc64_caches.l1d)) + pr_warn("Argh, can't find dcache properties !\n"); + + if (!parse_cache_info(cpu, true, &ppc64_caches.l1i)) + pr_warn("Argh, can't find icache properties !\n"); + + /* + * Try to find the L2 and L3 if any. Assume they are + * unified and use the D-side properties. + */ + l2 = of_find_next_cache_node(cpu); + of_node_put(cpu); + if (l2) { + parse_cache_info(l2, false, &ppc64_caches.l2); + l3 = of_find_next_cache_node(l2); + of_node_put(l2); + } + if (l3) { + parse_cache_info(l3, false, &ppc64_caches.l3); + of_node_put(l3); + } + } + + /* For use by binfmt_elf */ + dcache_bsize = ppc64_caches.l1d.block_size; + icache_bsize = ppc64_caches.l1i.block_size; + + cur_cpu_spec->dcache_bsize = dcache_bsize; + cur_cpu_spec->icache_bsize = icache_bsize; +} + +/* + * This returns the limit below which memory accesses to the linear + * mapping are guarnateed not to cause an architectural exception (e.g., + * TLB or SLB miss fault). + * + * This is used to allocate PACAs and various interrupt stacks that + * that are accessed early in interrupt handlers that must not cause + * re-entrant interrupts. + */ +__init u64 ppc64_bolted_size(void) +{ +#ifdef CONFIG_PPC_BOOK3E_64 + /* Freescale BookE bolts the entire linear mapping */ + /* XXX: BookE ppc64_rma_limit setup seems to disagree? */ + if (early_mmu_has_feature(MMU_FTR_TYPE_FSL_E)) + return linear_map_top; + /* Other BookE, we assume the first GB is bolted */ + return 1ul << 30; +#else + /* BookS radix, does not take faults on linear mapping */ + if (early_radix_enabled()) + return ULONG_MAX; + + /* BookS hash, the first segment is bolted */ + if (early_mmu_has_feature(MMU_FTR_1T_SEGMENT)) + return 1UL << SID_SHIFT_1T; + return 1UL << SID_SHIFT; +#endif +} + +static void *__init alloc_stack(unsigned long limit, int cpu) +{ + void *ptr; + + BUILD_BUG_ON(STACK_INT_FRAME_SIZE % 16); + + ptr = memblock_alloc_try_nid(THREAD_SIZE, THREAD_ALIGN, + MEMBLOCK_LOW_LIMIT, limit, + early_cpu_to_node(cpu)); + if (!ptr) + panic("cannot allocate stacks"); + + return ptr; +} + +void __init irqstack_early_init(void) +{ + u64 limit = ppc64_bolted_size(); + unsigned int i; + + /* + * Interrupt stacks must be in the first segment since we + * cannot afford to take SLB misses on them. They are not + * accessed in realmode. + */ + for_each_possible_cpu(i) { + softirq_ctx[i] = alloc_stack(limit, i); + hardirq_ctx[i] = alloc_stack(limit, i); + } +} + +#ifdef CONFIG_PPC_BOOK3E_64 +void __init exc_lvl_early_init(void) +{ + unsigned int i; + + for_each_possible_cpu(i) { + void *sp; + + sp = alloc_stack(ULONG_MAX, i); + critirq_ctx[i] = sp; + paca_ptrs[i]->crit_kstack = sp + THREAD_SIZE; + + sp = alloc_stack(ULONG_MAX, i); + dbgirq_ctx[i] = sp; + paca_ptrs[i]->dbg_kstack = sp + THREAD_SIZE; + + sp = alloc_stack(ULONG_MAX, i); + mcheckirq_ctx[i] = sp; + paca_ptrs[i]->mc_kstack = sp + THREAD_SIZE; + } + + if (cpu_has_feature(CPU_FTR_DEBUG_LVL_EXC)) + patch_exception(0x040, exc_debug_debug_book3e); +} +#endif + +/* + * Stack space used when we detect a bad kernel stack pointer, and + * early in SMP boots before relocation is enabled. Exclusive emergency + * stack for machine checks. + */ +void __init emergency_stack_init(void) +{ + u64 limit, mce_limit; + unsigned int i; + + /* + * Emergency stacks must be under 256MB, we cannot afford to take + * SLB misses on them. The ABI also requires them to be 128-byte + * aligned. + * + * Since we use these as temporary stacks during secondary CPU + * bringup, machine check, system reset, and HMI, we need to get + * at them in real mode. This means they must also be within the RMO + * region. + * + * The IRQ stacks allocated elsewhere in this file are zeroed and + * initialized in kernel/irq.c. These are initialized here in order + * to have emergency stacks available as early as possible. + */ + limit = mce_limit = min(ppc64_bolted_size(), ppc64_rma_size); + + /* + * Machine check on pseries calls rtas, but can't use the static + * rtas_args due to a machine check hitting while the lock is held. + * rtas args have to be under 4GB, so the machine check stack is + * limited to 4GB so args can be put on stack. + */ + if (firmware_has_feature(FW_FEATURE_LPAR) && mce_limit > SZ_4G) + mce_limit = SZ_4G; + + for_each_possible_cpu(i) { + paca_ptrs[i]->emergency_sp = alloc_stack(limit, i) + THREAD_SIZE; + +#ifdef CONFIG_PPC_BOOK3S_64 + /* emergency stack for NMI exception handling. */ + paca_ptrs[i]->nmi_emergency_sp = alloc_stack(limit, i) + THREAD_SIZE; + + /* emergency stack for machine check exception handling. */ + paca_ptrs[i]->mc_emergency_sp = alloc_stack(mce_limit, i) + THREAD_SIZE; +#endif + } +} + +#ifdef CONFIG_SMP +static int pcpu_cpu_distance(unsigned int from, unsigned int to) +{ + if (early_cpu_to_node(from) == early_cpu_to_node(to)) + return LOCAL_DISTANCE; + else + return REMOTE_DISTANCE; +} + +static __init int pcpu_cpu_to_node(int cpu) +{ + return early_cpu_to_node(cpu); +} + +unsigned long __per_cpu_offset[NR_CPUS] __read_mostly; +EXPORT_SYMBOL(__per_cpu_offset); + +void __init setup_per_cpu_areas(void) +{ + const size_t dyn_size = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE; + size_t atom_size; + unsigned long delta; + unsigned int cpu; + int rc = -EINVAL; + + /* + * BookE and BookS radix are historical values and should be revisited. + */ + if (IS_ENABLED(CONFIG_PPC_BOOK3E_64)) { + atom_size = SZ_1M; + } else if (radix_enabled()) { + atom_size = PAGE_SIZE; + } else if (IS_ENABLED(CONFIG_PPC_64S_HASH_MMU)) { + /* + * Linear mapping is one of 4K, 1M and 16M. For 4K, no need + * to group units. For larger mappings, use 1M atom which + * should be large enough to contain a number of units. + */ + if (mmu_linear_psize == MMU_PAGE_4K) + atom_size = PAGE_SIZE; + else + atom_size = SZ_1M; + } + + if (pcpu_chosen_fc != PCPU_FC_PAGE) { + rc = pcpu_embed_first_chunk(0, dyn_size, atom_size, pcpu_cpu_distance, + pcpu_cpu_to_node); + if (rc) + pr_warn("PERCPU: %s allocator failed (%d), " + "falling back to page size\n", + pcpu_fc_names[pcpu_chosen_fc], rc); + } + + if (rc < 0) + rc = pcpu_page_first_chunk(0, pcpu_cpu_to_node); + if (rc < 0) + panic("cannot initialize percpu area (err=%d)", rc); + + delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start; + for_each_possible_cpu(cpu) { + __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu]; + paca_ptrs[cpu]->data_offset = __per_cpu_offset[cpu]; + } +} +#endif + +#ifdef CONFIG_MEMORY_HOTPLUG +unsigned long memory_block_size_bytes(void) +{ + if (ppc_md.memory_block_size) + return ppc_md.memory_block_size(); + + return MIN_MEMORY_BLOCK_SIZE; +} +#endif + +#if defined(CONFIG_PPC_INDIRECT_PIO) || defined(CONFIG_PPC_INDIRECT_MMIO) +struct ppc_pci_io ppc_pci_io; +EXPORT_SYMBOL(ppc_pci_io); +#endif + +#ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF +u64 hw_nmi_get_sample_period(int watchdog_thresh) +{ + return ppc_proc_freq * watchdog_thresh; +} +#endif + +/* + * The perf based hardlockup detector breaks PMU event based branches, so + * disable it by default. Book3S has a soft-nmi hardlockup detector based + * on the decrementer interrupt, so it does not suffer from this problem. + * + * It is likely to get false positives in KVM guests, so disable it there + * by default too. PowerVM will not stop or arbitrarily oversubscribe + * CPUs, but give a minimum regular allotment even with SPLPAR, so enable + * the detector for non-KVM guests, assume PowerVM. + */ +static int __init disable_hardlockup_detector(void) +{ +#ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF + hardlockup_detector_disable(); +#else + if (firmware_has_feature(FW_FEATURE_LPAR)) { + if (is_kvm_guest()) + hardlockup_detector_disable(); + } +#endif + + return 0; +} +early_initcall(disable_hardlockup_detector); diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c new file mode 100644 index 000000000..68a91e553 --- /dev/null +++ b/arch/powerpc/kernel/signal.c @@ -0,0 +1,373 @@ +/* + * Common signal handling code for both 32 and 64 bits + * + * Copyright (c) 2007 Benjamin Herrenschmidt, IBM Corporation + * Extracted from signal_32.c and signal_64.c + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file README.legal in the main directory of + * this archive for more details. + */ + +#include <linux/resume_user_mode.h> +#include <linux/signal.h> +#include <linux/uprobes.h> +#include <linux/key.h> +#include <linux/context_tracking.h> +#include <linux/livepatch.h> +#include <linux/syscalls.h> +#include <asm/hw_breakpoint.h> +#include <linux/uaccess.h> +#include <asm/switch_to.h> +#include <asm/unistd.h> +#include <asm/debug.h> +#include <asm/tm.h> + +#include "signal.h" + +#ifdef CONFIG_VSX +unsigned long copy_fpr_to_user(void __user *to, + struct task_struct *task) +{ + u64 buf[ELF_NFPREG]; + int i; + + /* save FPR copy to local buffer then write to the thread_struct */ + for (i = 0; i < (ELF_NFPREG - 1) ; i++) + buf[i] = task->thread.TS_FPR(i); + buf[i] = task->thread.fp_state.fpscr; + return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double)); +} + +unsigned long copy_fpr_from_user(struct task_struct *task, + void __user *from) +{ + u64 buf[ELF_NFPREG]; + int i; + + if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double))) + return 1; + for (i = 0; i < (ELF_NFPREG - 1) ; i++) + task->thread.TS_FPR(i) = buf[i]; + task->thread.fp_state.fpscr = buf[i]; + + return 0; +} + +unsigned long copy_vsx_to_user(void __user *to, + struct task_struct *task) +{ + u64 buf[ELF_NVSRHALFREG]; + int i; + + /* save FPR copy to local buffer then write to the thread_struct */ + for (i = 0; i < ELF_NVSRHALFREG; i++) + buf[i] = task->thread.fp_state.fpr[i][TS_VSRLOWOFFSET]; + return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double)); +} + +unsigned long copy_vsx_from_user(struct task_struct *task, + void __user *from) +{ + u64 buf[ELF_NVSRHALFREG]; + int i; + + if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double))) + return 1; + for (i = 0; i < ELF_NVSRHALFREG ; i++) + task->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i]; + return 0; +} + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +unsigned long copy_ckfpr_to_user(void __user *to, + struct task_struct *task) +{ + u64 buf[ELF_NFPREG]; + int i; + + /* save FPR copy to local buffer then write to the thread_struct */ + for (i = 0; i < (ELF_NFPREG - 1) ; i++) + buf[i] = task->thread.TS_CKFPR(i); + buf[i] = task->thread.ckfp_state.fpscr; + return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double)); +} + +unsigned long copy_ckfpr_from_user(struct task_struct *task, + void __user *from) +{ + u64 buf[ELF_NFPREG]; + int i; + + if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double))) + return 1; + for (i = 0; i < (ELF_NFPREG - 1) ; i++) + task->thread.TS_CKFPR(i) = buf[i]; + task->thread.ckfp_state.fpscr = buf[i]; + + return 0; +} + +unsigned long copy_ckvsx_to_user(void __user *to, + struct task_struct *task) +{ + u64 buf[ELF_NVSRHALFREG]; + int i; + + /* save FPR copy to local buffer then write to the thread_struct */ + for (i = 0; i < ELF_NVSRHALFREG; i++) + buf[i] = task->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET]; + return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double)); +} + +unsigned long copy_ckvsx_from_user(struct task_struct *task, + void __user *from) +{ + u64 buf[ELF_NVSRHALFREG]; + int i; + + if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double))) + return 1; + for (i = 0; i < ELF_NVSRHALFREG ; i++) + task->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i]; + return 0; +} +#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ +#endif + +/* Log an error when sending an unhandled signal to a process. Controlled + * through debug.exception-trace sysctl. + */ + +int show_unhandled_signals = 1; + +unsigned long get_min_sigframe_size(void) +{ + if (IS_ENABLED(CONFIG_PPC64)) + return get_min_sigframe_size_64(); + else + return get_min_sigframe_size_32(); +} + +#ifdef CONFIG_COMPAT +unsigned long get_min_sigframe_size_compat(void) +{ + return get_min_sigframe_size_32(); +} +#endif + +/* + * Allocate space for the signal frame + */ +static unsigned long get_tm_stackpointer(struct task_struct *tsk); + +void __user *get_sigframe(struct ksignal *ksig, struct task_struct *tsk, + size_t frame_size, int is_32) +{ + unsigned long oldsp, newsp; + unsigned long sp = get_tm_stackpointer(tsk); + + /* Default to using normal stack */ + if (is_32) + oldsp = sp & 0x0ffffffffUL; + else + oldsp = sp; + oldsp = sigsp(oldsp, ksig); + newsp = (oldsp - frame_size) & ~0xFUL; + + return (void __user *)newsp; +} + +static void check_syscall_restart(struct pt_regs *regs, struct k_sigaction *ka, + int has_handler) +{ + unsigned long ret = regs->gpr[3]; + int restart = 1; + + /* syscall ? */ + if (!trap_is_syscall(regs)) + return; + + if (trap_norestart(regs)) + return; + + /* error signalled ? */ + if (trap_is_scv(regs)) { + /* 32-bit compat mode sign extend? */ + if (!IS_ERR_VALUE(ret)) + return; + ret = -ret; + } else if (!(regs->ccr & 0x10000000)) { + return; + } + + switch (ret) { + case ERESTART_RESTARTBLOCK: + case ERESTARTNOHAND: + /* ERESTARTNOHAND means that the syscall should only be + * restarted if there was no handler for the signal, and since + * we only get here if there is a handler, we dont restart. + */ + restart = !has_handler; + break; + case ERESTARTSYS: + /* ERESTARTSYS means to restart the syscall if there is no + * handler or the handler was registered with SA_RESTART + */ + restart = !has_handler || (ka->sa.sa_flags & SA_RESTART) != 0; + break; + case ERESTARTNOINTR: + /* ERESTARTNOINTR means that the syscall should be + * called again after the signal handler returns. + */ + break; + default: + return; + } + if (restart) { + if (ret == ERESTART_RESTARTBLOCK) + regs->gpr[0] = __NR_restart_syscall; + else + regs->gpr[3] = regs->orig_gpr3; + regs_add_return_ip(regs, -4); + regs->result = 0; + } else { + if (trap_is_scv(regs)) { + regs->result = -EINTR; + regs->gpr[3] = -EINTR; + } else { + regs->result = -EINTR; + regs->gpr[3] = EINTR; + regs->ccr |= 0x10000000; + } + } +} + +static void do_signal(struct task_struct *tsk) +{ + sigset_t *oldset = sigmask_to_save(); + struct ksignal ksig = { .sig = 0 }; + int ret; + + BUG_ON(tsk != current); + + get_signal(&ksig); + + /* Is there any syscall restart business here ? */ + check_syscall_restart(tsk->thread.regs, &ksig.ka, ksig.sig > 0); + + if (ksig.sig <= 0) { + /* No signal to deliver -- put the saved sigmask back */ + restore_saved_sigmask(); + set_trap_norestart(tsk->thread.regs); + return; /* no signals delivered */ + } + + /* + * Reenable the DABR before delivering the signal to + * user space. The DABR will have been cleared if it + * triggered inside the kernel. + */ + if (!IS_ENABLED(CONFIG_PPC_ADV_DEBUG_REGS)) { + int i; + + for (i = 0; i < nr_wp_slots(); i++) { + if (tsk->thread.hw_brk[i].address && tsk->thread.hw_brk[i].type) + __set_breakpoint(i, &tsk->thread.hw_brk[i]); + } + } + + /* Re-enable the breakpoints for the signal stack */ + thread_change_pc(tsk, tsk->thread.regs); + + rseq_signal_deliver(&ksig, tsk->thread.regs); + + if (is_32bit_task()) { + if (ksig.ka.sa.sa_flags & SA_SIGINFO) + ret = handle_rt_signal32(&ksig, oldset, tsk); + else + ret = handle_signal32(&ksig, oldset, tsk); + } else { + ret = handle_rt_signal64(&ksig, oldset, tsk); + } + + set_trap_norestart(tsk->thread.regs); + signal_setup_done(ret, &ksig, test_thread_flag(TIF_SINGLESTEP)); +} + +void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags) +{ + if (thread_info_flags & _TIF_UPROBE) + uprobe_notify_resume(regs); + + if (thread_info_flags & _TIF_PATCH_PENDING) + klp_update_patch_state(current); + + if (thread_info_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL)) { + BUG_ON(regs != current->thread.regs); + do_signal(current); + } + + if (thread_info_flags & _TIF_NOTIFY_RESUME) + resume_user_mode_work(regs); +} + +static unsigned long get_tm_stackpointer(struct task_struct *tsk) +{ + /* When in an active transaction that takes a signal, we need to be + * careful with the stack. It's possible that the stack has moved back + * up after the tbegin. The obvious case here is when the tbegin is + * called inside a function that returns before a tend. In this case, + * the stack is part of the checkpointed transactional memory state. + * If we write over this non transactionally or in suspend, we are in + * trouble because if we get a tm abort, the program counter and stack + * pointer will be back at the tbegin but our in memory stack won't be + * valid anymore. + * + * To avoid this, when taking a signal in an active transaction, we + * need to use the stack pointer from the checkpointed state, rather + * than the speculated state. This ensures that the signal context + * (written tm suspended) will be written below the stack required for + * the rollback. The transaction is aborted because of the treclaim, + * so any memory written between the tbegin and the signal will be + * rolled back anyway. + * + * For signals taken in non-TM or suspended mode, we use the + * normal/non-checkpointed stack pointer. + */ + struct pt_regs *regs = tsk->thread.regs; + unsigned long ret = regs->gpr[1]; + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + BUG_ON(tsk != current); + + if (MSR_TM_ACTIVE(regs->msr)) { + preempt_disable(); + tm_reclaim_current(TM_CAUSE_SIGNAL); + if (MSR_TM_TRANSACTIONAL(regs->msr)) + ret = tsk->thread.ckpt_regs.gpr[1]; + + /* + * If we treclaim, we must clear the current thread's TM bits + * before re-enabling preemption. Otherwise we might be + * preempted and have the live MSR[TS] changed behind our back + * (tm_recheckpoint_new_task() would recheckpoint). Besides, we + * enter the signal handler in non-transactional state. + */ + regs_set_return_msr(regs, regs->msr & ~MSR_TS_MASK); + preempt_enable(); + } +#endif + return ret; +} + +static const char fm32[] = KERN_INFO "%s[%d]: bad frame in %s: %p nip %08lx lr %08lx\n"; +static const char fm64[] = KERN_INFO "%s[%d]: bad frame in %s: %p nip %016lx lr %016lx\n"; + +void signal_fault(struct task_struct *tsk, struct pt_regs *regs, + const char *where, void __user *ptr) +{ + if (show_unhandled_signals) + printk_ratelimited(regs->msr & MSR_64BIT ? fm64 : fm32, tsk->comm, + task_pid_nr(tsk), where, ptr, regs->nip, regs->link); +} diff --git a/arch/powerpc/kernel/signal.h b/arch/powerpc/kernel/signal.h new file mode 100644 index 000000000..a429c57ed --- /dev/null +++ b/arch/powerpc/kernel/signal.h @@ -0,0 +1,210 @@ +/* + * Copyright (c) 2007 Benjamin Herrenschmidt, IBM Corporation + * Extracted from signal_32.c and signal_64.c + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file README.legal in the main directory of + * this archive for more details. + */ + +#ifndef _POWERPC_ARCH_SIGNAL_H +#define _POWERPC_ARCH_SIGNAL_H + +void __user *get_sigframe(struct ksignal *ksig, struct task_struct *tsk, + size_t frame_size, int is_32); + +extern int handle_signal32(struct ksignal *ksig, sigset_t *oldset, + struct task_struct *tsk); + +extern int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset, + struct task_struct *tsk); + +static inline int __get_user_sigset(sigset_t *dst, const sigset_t __user *src) +{ + BUILD_BUG_ON(sizeof(sigset_t) != sizeof(u64)); + + return __get_user(dst->sig[0], (u64 __user *)&src->sig[0]); +} +#define unsafe_get_user_sigset(dst, src, label) do { \ + sigset_t *__dst = dst; \ + const sigset_t __user *__src = src; \ + int i; \ + \ + for (i = 0; i < _NSIG_WORDS; i++) \ + unsafe_get_user(__dst->sig[i], &__src->sig[i], label); \ +} while (0) + +#ifdef CONFIG_VSX +extern unsigned long copy_vsx_to_user(void __user *to, + struct task_struct *task); +extern unsigned long copy_ckvsx_to_user(void __user *to, + struct task_struct *task); +extern unsigned long copy_vsx_from_user(struct task_struct *task, + void __user *from); +extern unsigned long copy_ckvsx_from_user(struct task_struct *task, + void __user *from); +unsigned long copy_fpr_to_user(void __user *to, struct task_struct *task); +unsigned long copy_ckfpr_to_user(void __user *to, struct task_struct *task); +unsigned long copy_fpr_from_user(struct task_struct *task, void __user *from); +unsigned long copy_ckfpr_from_user(struct task_struct *task, void __user *from); + +#define unsafe_copy_fpr_to_user(to, task, label) do { \ + struct task_struct *__t = task; \ + u64 __user *buf = (u64 __user *)to; \ + int i; \ + \ + for (i = 0; i < ELF_NFPREG - 1 ; i++) \ + unsafe_put_user(__t->thread.TS_FPR(i), &buf[i], label); \ + unsafe_put_user(__t->thread.fp_state.fpscr, &buf[i], label); \ +} while (0) + +#define unsafe_copy_vsx_to_user(to, task, label) do { \ + struct task_struct *__t = task; \ + u64 __user *buf = (u64 __user *)to; \ + int i; \ + \ + for (i = 0; i < ELF_NVSRHALFREG ; i++) \ + unsafe_put_user(__t->thread.fp_state.fpr[i][TS_VSRLOWOFFSET], \ + &buf[i], label);\ +} while (0) + +#define unsafe_copy_fpr_from_user(task, from, label) do { \ + struct task_struct *__t = task; \ + u64 __user *buf = (u64 __user *)from; \ + int i; \ + \ + for (i = 0; i < ELF_NFPREG - 1; i++) \ + unsafe_get_user(__t->thread.TS_FPR(i), &buf[i], label); \ + unsafe_get_user(__t->thread.fp_state.fpscr, &buf[i], label); \ +} while (0) + +#define unsafe_copy_vsx_from_user(task, from, label) do { \ + struct task_struct *__t = task; \ + u64 __user *buf = (u64 __user *)from; \ + int i; \ + \ + for (i = 0; i < ELF_NVSRHALFREG ; i++) \ + unsafe_get_user(__t->thread.fp_state.fpr[i][TS_VSRLOWOFFSET], \ + &buf[i], label); \ +} while (0) + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +#define unsafe_copy_ckfpr_to_user(to, task, label) do { \ + struct task_struct *__t = task; \ + u64 __user *buf = (u64 __user *)to; \ + int i; \ + \ + for (i = 0; i < ELF_NFPREG - 1 ; i++) \ + unsafe_put_user(__t->thread.TS_CKFPR(i), &buf[i], label);\ + unsafe_put_user(__t->thread.ckfp_state.fpscr, &buf[i], label); \ +} while (0) + +#define unsafe_copy_ckvsx_to_user(to, task, label) do { \ + struct task_struct *__t = task; \ + u64 __user *buf = (u64 __user *)to; \ + int i; \ + \ + for (i = 0; i < ELF_NVSRHALFREG ; i++) \ + unsafe_put_user(__t->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET], \ + &buf[i], label);\ +} while (0) + +#define unsafe_copy_ckfpr_from_user(task, from, label) do { \ + struct task_struct *__t = task; \ + u64 __user *buf = (u64 __user *)from; \ + int i; \ + \ + for (i = 0; i < ELF_NFPREG - 1 ; i++) \ + unsafe_get_user(__t->thread.TS_CKFPR(i), &buf[i], label);\ + unsafe_get_user(__t->thread.ckfp_state.fpscr, &buf[i], failed); \ +} while (0) + +#define unsafe_copy_ckvsx_from_user(task, from, label) do { \ + struct task_struct *__t = task; \ + u64 __user *buf = (u64 __user *)from; \ + int i; \ + \ + for (i = 0; i < ELF_NVSRHALFREG ; i++) \ + unsafe_get_user(__t->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET], \ + &buf[i], label); \ +} while (0) +#endif +#elif defined(CONFIG_PPC_FPU_REGS) + +#define unsafe_copy_fpr_to_user(to, task, label) \ + unsafe_copy_to_user(to, (task)->thread.fp_state.fpr, \ + ELF_NFPREG * sizeof(double), label) + +#define unsafe_copy_fpr_from_user(task, from, label) \ + unsafe_copy_from_user((task)->thread.fp_state.fpr, from, \ + ELF_NFPREG * sizeof(double), label) + +static inline unsigned long +copy_fpr_to_user(void __user *to, struct task_struct *task) +{ + return __copy_to_user(to, task->thread.fp_state.fpr, + ELF_NFPREG * sizeof(double)); +} + +static inline unsigned long +copy_fpr_from_user(struct task_struct *task, void __user *from) +{ + return __copy_from_user(task->thread.fp_state.fpr, from, + ELF_NFPREG * sizeof(double)); +} + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +#define unsafe_copy_ckfpr_to_user(to, task, label) \ + unsafe_copy_to_user(to, (task)->thread.ckfp_state.fpr, \ + ELF_NFPREG * sizeof(double), label) + +inline unsigned long copy_ckfpr_to_user(void __user *to, struct task_struct *task) +{ + return __copy_to_user(to, task->thread.ckfp_state.fpr, + ELF_NFPREG * sizeof(double)); +} + +static inline unsigned long +copy_ckfpr_from_user(struct task_struct *task, void __user *from) +{ + return __copy_from_user(task->thread.ckfp_state.fpr, from, + ELF_NFPREG * sizeof(double)); +} +#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ +#else +#define unsafe_copy_fpr_to_user(to, task, label) do { if (0) goto label;} while (0) + +#define unsafe_copy_fpr_from_user(task, from, label) do { if (0) goto label;} while (0) + +static inline unsigned long +copy_fpr_to_user(void __user *to, struct task_struct *task) +{ + return 0; +} + +static inline unsigned long +copy_fpr_from_user(struct task_struct *task, void __user *from) +{ + return 0; +} +#endif + +#ifdef CONFIG_PPC64 + +extern int handle_rt_signal64(struct ksignal *ksig, sigset_t *set, + struct task_struct *tsk); + +#else /* CONFIG_PPC64 */ + +static inline int handle_rt_signal64(struct ksignal *ksig, sigset_t *set, + struct task_struct *tsk) +{ + return -EFAULT; +} + +#endif /* !defined(CONFIG_PPC64) */ + +void signal_fault(struct task_struct *tsk, struct pt_regs *regs, + const char *where, void __user *ptr); + +#endif /* _POWERPC_ARCH_SIGNAL_H */ diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c new file mode 100644 index 000000000..7a718ed32 --- /dev/null +++ b/arch/powerpc/kernel/signal_32.c @@ -0,0 +1,1359 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Signal handling for 32bit PPC and 32bit tasks on 64bit PPC + * + * PowerPC version + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * Copyright (C) 2001 IBM + * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) + * + * Derived from "arch/i386/kernel/signal.c" + * Copyright (C) 1991, 1992 Linus Torvalds + * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson + */ + +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/kernel.h> +#include <linux/signal.h> +#include <linux/errno.h> +#include <linux/elf.h> +#include <linux/ptrace.h> +#include <linux/pagemap.h> +#include <linux/ratelimit.h> +#include <linux/syscalls.h> +#ifdef CONFIG_PPC64 +#include <linux/compat.h> +#else +#include <linux/wait.h> +#include <linux/unistd.h> +#include <linux/stddef.h> +#include <linux/tty.h> +#include <linux/binfmts.h> +#endif + +#include <linux/uaccess.h> +#include <asm/cacheflush.h> +#include <asm/syscalls.h> +#include <asm/sigcontext.h> +#include <asm/vdso.h> +#include <asm/switch_to.h> +#include <asm/tm.h> +#include <asm/asm-prototypes.h> +#ifdef CONFIG_PPC64 +#include <asm/syscalls_32.h> +#include <asm/unistd.h> +#else +#include <asm/ucontext.h> +#endif + +#include "signal.h" + + +#ifdef CONFIG_PPC64 +#define old_sigaction old_sigaction32 +#define sigcontext sigcontext32 +#define mcontext mcontext32 +#define ucontext ucontext32 + +/* + * Userspace code may pass a ucontext which doesn't include VSX added + * at the end. We need to check for this case. + */ +#define UCONTEXTSIZEWITHOUTVSX \ + (sizeof(struct ucontext) - sizeof(elf_vsrreghalf_t32)) + +/* + * Returning 0 means we return to userspace via + * ret_from_except and thus restore all user + * registers from *regs. This is what we need + * to do when a signal has been delivered. + */ + +#define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32)) +#undef __SIGNAL_FRAMESIZE +#define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32 +#undef ELF_NVRREG +#define ELF_NVRREG ELF_NVRREG32 + +/* + * Functions for flipping sigsets (thanks to brain dead generic + * implementation that makes things simple for little endian only) + */ +#define unsafe_put_sigset_t unsafe_put_compat_sigset +#define unsafe_get_sigset_t unsafe_get_compat_sigset + +#define to_user_ptr(p) ptr_to_compat(p) +#define from_user_ptr(p) compat_ptr(p) + +static __always_inline int +__unsafe_save_general_regs(struct pt_regs *regs, struct mcontext __user *frame) +{ + elf_greg_t64 *gregs = (elf_greg_t64 *)regs; + int val, i; + + for (i = 0; i <= PT_RESULT; i ++) { + /* Force usr to alway see softe as 1 (interrupts enabled) */ + if (i == PT_SOFTE) + val = 1; + else + val = gregs[i]; + + unsafe_put_user(val, &frame->mc_gregs[i], failed); + } + return 0; + +failed: + return 1; +} + +static __always_inline int +__unsafe_restore_general_regs(struct pt_regs *regs, struct mcontext __user *sr) +{ + elf_greg_t64 *gregs = (elf_greg_t64 *)regs; + int i; + + for (i = 0; i <= PT_RESULT; i++) { + if ((i == PT_MSR) || (i == PT_SOFTE)) + continue; + unsafe_get_user(gregs[i], &sr->mc_gregs[i], failed); + } + return 0; + +failed: + return 1; +} + +#else /* CONFIG_PPC64 */ + +#define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs)) + +#define unsafe_put_sigset_t(uset, set, label) do { \ + sigset_t __user *__us = uset ; \ + const sigset_t *__s = set; \ + \ + unsafe_copy_to_user(__us, __s, sizeof(*__us), label); \ +} while (0) + +#define unsafe_get_sigset_t unsafe_get_user_sigset + +#define to_user_ptr(p) ((unsigned long)(p)) +#define from_user_ptr(p) ((void __user *)(p)) + +static __always_inline int +__unsafe_save_general_regs(struct pt_regs *regs, struct mcontext __user *frame) +{ + unsafe_copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE, failed); + return 0; + +failed: + return 1; +} + +static __always_inline +int __unsafe_restore_general_regs(struct pt_regs *regs, struct mcontext __user *sr) +{ + /* copy up to but not including MSR */ + unsafe_copy_from_user(regs, &sr->mc_gregs, PT_MSR * sizeof(elf_greg_t), failed); + + /* copy from orig_r3 (the word after the MSR) up to the end */ + unsafe_copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3], + GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t), failed); + + return 0; + +failed: + return 1; +} +#endif + +#define unsafe_save_general_regs(regs, frame, label) do { \ + if (__unsafe_save_general_regs(regs, frame)) \ + goto label; \ +} while (0) + +#define unsafe_restore_general_regs(regs, frame, label) do { \ + if (__unsafe_restore_general_regs(regs, frame)) \ + goto label; \ +} while (0) + +/* + * When we have signals to deliver, we set up on the + * user stack, going down from the original stack pointer: + * an ABI gap of 56 words + * an mcontext struct + * a sigcontext struct + * a gap of __SIGNAL_FRAMESIZE bytes + * + * Each of these things must be a multiple of 16 bytes in size. The following + * structure represent all of this except the __SIGNAL_FRAMESIZE gap + * + */ +struct sigframe { + struct sigcontext sctx; /* the sigcontext */ + struct mcontext mctx; /* all the register values */ +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + struct sigcontext sctx_transact; + struct mcontext mctx_transact; +#endif + /* + * Programs using the rs6000/xcoff abi can save up to 19 gp + * regs and 18 fp regs below sp before decrementing it. + */ + int abigap[56]; +}; + +/* + * When we have rt signals to deliver, we set up on the + * user stack, going down from the original stack pointer: + * one rt_sigframe struct (siginfo + ucontext + ABI gap) + * a gap of __SIGNAL_FRAMESIZE+16 bytes + * (the +16 is to get the siginfo and ucontext in the same + * positions as in older kernels). + * + * Each of these things must be a multiple of 16 bytes in size. + * + */ +struct rt_sigframe { +#ifdef CONFIG_PPC64 + compat_siginfo_t info; +#else + struct siginfo info; +#endif + struct ucontext uc; +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + struct ucontext uc_transact; +#endif + /* + * Programs using the rs6000/xcoff abi can save up to 19 gp + * regs and 18 fp regs below sp before decrementing it. + */ + int abigap[56]; +}; + +unsigned long get_min_sigframe_size_32(void) +{ + return max(sizeof(struct rt_sigframe) + __SIGNAL_FRAMESIZE + 16, + sizeof(struct sigframe) + __SIGNAL_FRAMESIZE); +} + +/* + * Save the current user registers on the user stack. + * We only save the altivec/spe registers if the process has used + * altivec/spe instructions at some point. + */ +static void prepare_save_user_regs(int ctx_has_vsx_region) +{ + /* Make sure floating point registers are stored in regs */ + flush_fp_to_thread(current); +#ifdef CONFIG_ALTIVEC + if (current->thread.used_vr) + flush_altivec_to_thread(current); + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + current->thread.vrsave = mfspr(SPRN_VRSAVE); +#endif +#ifdef CONFIG_VSX + if (current->thread.used_vsr && ctx_has_vsx_region) + flush_vsx_to_thread(current); +#endif +#ifdef CONFIG_SPE + if (current->thread.used_spe) + flush_spe_to_thread(current); +#endif +} + +static __always_inline int +__unsafe_save_user_regs(struct pt_regs *regs, struct mcontext __user *frame, + struct mcontext __user *tm_frame, int ctx_has_vsx_region) +{ + unsigned long msr = regs->msr; + + /* save general registers */ + unsafe_save_general_regs(regs, frame, failed); + +#ifdef CONFIG_ALTIVEC + /* save altivec registers */ + if (current->thread.used_vr) { + unsafe_copy_to_user(&frame->mc_vregs, ¤t->thread.vr_state, + ELF_NVRREG * sizeof(vector128), failed); + /* set MSR_VEC in the saved MSR value to indicate that + frame->mc_vregs contains valid data */ + msr |= MSR_VEC; + } + /* else assert((regs->msr & MSR_VEC) == 0) */ + + /* We always copy to/from vrsave, it's 0 if we don't have or don't + * use altivec. Since VSCR only contains 32 bits saved in the least + * significant bits of a vector, we "cheat" and stuff VRSAVE in the + * most significant bits of that same vector. --BenH + * Note that the current VRSAVE value is in the SPR at this point. + */ + unsafe_put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32], + failed); +#endif /* CONFIG_ALTIVEC */ + unsafe_copy_fpr_to_user(&frame->mc_fregs, current, failed); + + /* + * Clear the MSR VSX bit to indicate there is no valid state attached + * to this context, except in the specific case below where we set it. + */ + msr &= ~MSR_VSX; +#ifdef CONFIG_VSX + /* + * Copy VSR 0-31 upper half from thread_struct to local + * buffer, then write that to userspace. Also set MSR_VSX in + * the saved MSR value to indicate that frame->mc_vregs + * contains valid data + */ + if (current->thread.used_vsr && ctx_has_vsx_region) { + unsafe_copy_vsx_to_user(&frame->mc_vsregs, current, failed); + msr |= MSR_VSX; + } +#endif /* CONFIG_VSX */ +#ifdef CONFIG_SPE + /* save spe registers */ + if (current->thread.used_spe) { + unsafe_copy_to_user(&frame->mc_vregs, current->thread.evr, + ELF_NEVRREG * sizeof(u32), failed); + /* set MSR_SPE in the saved MSR value to indicate that + frame->mc_vregs contains valid data */ + msr |= MSR_SPE; + } + /* else assert((regs->msr & MSR_SPE) == 0) */ + + /* We always copy to/from spefscr */ + unsafe_put_user(current->thread.spefscr, + (u32 __user *)&frame->mc_vregs + ELF_NEVRREG, failed); +#endif /* CONFIG_SPE */ + + unsafe_put_user(msr, &frame->mc_gregs[PT_MSR], failed); + + /* We need to write 0 the MSR top 32 bits in the tm frame so that we + * can check it on the restore to see if TM is active + */ + if (tm_frame) + unsafe_put_user(0, &tm_frame->mc_gregs[PT_MSR], failed); + + return 0; + +failed: + return 1; +} + +#define unsafe_save_user_regs(regs, frame, tm_frame, has_vsx, label) do { \ + if (__unsafe_save_user_regs(regs, frame, tm_frame, has_vsx)) \ + goto label; \ +} while (0) + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +/* + * Save the current user registers on the user stack. + * We only save the altivec/spe registers if the process has used + * altivec/spe instructions at some point. + * We also save the transactional registers to a second ucontext in the + * frame. + * + * See __unsafe_save_user_regs() and signal_64.c:setup_tm_sigcontexts(). + */ +static void prepare_save_tm_user_regs(void) +{ + WARN_ON(tm_suspend_disabled); + + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + current->thread.ckvrsave = mfspr(SPRN_VRSAVE); +} + +static __always_inline int +save_tm_user_regs_unsafe(struct pt_regs *regs, struct mcontext __user *frame, + struct mcontext __user *tm_frame, unsigned long msr) +{ + /* Save both sets of general registers */ + unsafe_save_general_regs(¤t->thread.ckpt_regs, frame, failed); + unsafe_save_general_regs(regs, tm_frame, failed); + + /* Stash the top half of the 64bit MSR into the 32bit MSR word + * of the transactional mcontext. This way we have a backward-compatible + * MSR in the 'normal' (checkpointed) mcontext and additionally one can + * also look at what type of transaction (T or S) was active at the + * time of the signal. + */ + unsafe_put_user((msr >> 32), &tm_frame->mc_gregs[PT_MSR], failed); + + /* save altivec registers */ + if (current->thread.used_vr) { + unsafe_copy_to_user(&frame->mc_vregs, ¤t->thread.ckvr_state, + ELF_NVRREG * sizeof(vector128), failed); + if (msr & MSR_VEC) + unsafe_copy_to_user(&tm_frame->mc_vregs, + ¤t->thread.vr_state, + ELF_NVRREG * sizeof(vector128), failed); + else + unsafe_copy_to_user(&tm_frame->mc_vregs, + ¤t->thread.ckvr_state, + ELF_NVRREG * sizeof(vector128), failed); + + /* set MSR_VEC in the saved MSR value to indicate that + * frame->mc_vregs contains valid data + */ + msr |= MSR_VEC; + } + + /* We always copy to/from vrsave, it's 0 if we don't have or don't + * use altivec. Since VSCR only contains 32 bits saved in the least + * significant bits of a vector, we "cheat" and stuff VRSAVE in the + * most significant bits of that same vector. --BenH + */ + unsafe_put_user(current->thread.ckvrsave, + (u32 __user *)&frame->mc_vregs[32], failed); + if (msr & MSR_VEC) + unsafe_put_user(current->thread.vrsave, + (u32 __user *)&tm_frame->mc_vregs[32], failed); + else + unsafe_put_user(current->thread.ckvrsave, + (u32 __user *)&tm_frame->mc_vregs[32], failed); + + unsafe_copy_ckfpr_to_user(&frame->mc_fregs, current, failed); + if (msr & MSR_FP) + unsafe_copy_fpr_to_user(&tm_frame->mc_fregs, current, failed); + else + unsafe_copy_ckfpr_to_user(&tm_frame->mc_fregs, current, failed); + + /* + * Copy VSR 0-31 upper half from thread_struct to local + * buffer, then write that to userspace. Also set MSR_VSX in + * the saved MSR value to indicate that frame->mc_vregs + * contains valid data + */ + if (current->thread.used_vsr) { + unsafe_copy_ckvsx_to_user(&frame->mc_vsregs, current, failed); + if (msr & MSR_VSX) + unsafe_copy_vsx_to_user(&tm_frame->mc_vsregs, current, failed); + else + unsafe_copy_ckvsx_to_user(&tm_frame->mc_vsregs, current, failed); + + msr |= MSR_VSX; + } + + unsafe_put_user(msr, &frame->mc_gregs[PT_MSR], failed); + + return 0; + +failed: + return 1; +} +#else +static void prepare_save_tm_user_regs(void) { } + +static __always_inline int +save_tm_user_regs_unsafe(struct pt_regs *regs, struct mcontext __user *frame, + struct mcontext __user *tm_frame, unsigned long msr) +{ + return 0; +} +#endif + +#define unsafe_save_tm_user_regs(regs, frame, tm_frame, msr, label) do { \ + if (save_tm_user_regs_unsafe(regs, frame, tm_frame, msr)) \ + goto label; \ +} while (0) + +/* + * Restore the current user register values from the user stack, + * (except for MSR). + */ +static long restore_user_regs(struct pt_regs *regs, + struct mcontext __user *sr, int sig) +{ + unsigned int save_r2 = 0; + unsigned long msr; +#ifdef CONFIG_VSX + int i; +#endif + + if (!user_read_access_begin(sr, sizeof(*sr))) + return 1; + /* + * restore general registers but not including MSR or SOFTE. Also + * take care of keeping r2 (TLS) intact if not a signal + */ + if (!sig) + save_r2 = (unsigned int)regs->gpr[2]; + unsafe_restore_general_regs(regs, sr, failed); + set_trap_norestart(regs); + unsafe_get_user(msr, &sr->mc_gregs[PT_MSR], failed); + if (!sig) + regs->gpr[2] = (unsigned long) save_r2; + + /* if doing signal return, restore the previous little-endian mode */ + if (sig) + regs_set_return_msr(regs, (regs->msr & ~MSR_LE) | (msr & MSR_LE)); + +#ifdef CONFIG_ALTIVEC + /* + * Force the process to reload the altivec registers from + * current->thread when it next does altivec instructions + */ + regs_set_return_msr(regs, regs->msr & ~MSR_VEC); + if (msr & MSR_VEC) { + /* restore altivec registers from the stack */ + unsafe_copy_from_user(¤t->thread.vr_state, &sr->mc_vregs, + sizeof(sr->mc_vregs), failed); + current->thread.used_vr = true; + } else if (current->thread.used_vr) + memset(¤t->thread.vr_state, 0, + ELF_NVRREG * sizeof(vector128)); + + /* Always get VRSAVE back */ + unsafe_get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32], failed); + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + mtspr(SPRN_VRSAVE, current->thread.vrsave); +#endif /* CONFIG_ALTIVEC */ + unsafe_copy_fpr_from_user(current, &sr->mc_fregs, failed); + +#ifdef CONFIG_VSX + /* + * Force the process to reload the VSX registers from + * current->thread when it next does VSX instruction. + */ + regs_set_return_msr(regs, regs->msr & ~MSR_VSX); + if (msr & MSR_VSX) { + /* + * Restore altivec registers from the stack to a local + * buffer, then write this out to the thread_struct + */ + unsafe_copy_vsx_from_user(current, &sr->mc_vsregs, failed); + current->thread.used_vsr = true; + } else if (current->thread.used_vsr) + for (i = 0; i < 32 ; i++) + current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0; +#endif /* CONFIG_VSX */ + /* + * force the process to reload the FP registers from + * current->thread when it next does FP instructions + */ + regs_set_return_msr(regs, regs->msr & ~(MSR_FP | MSR_FE0 | MSR_FE1)); + +#ifdef CONFIG_SPE + /* + * Force the process to reload the spe registers from + * current->thread when it next does spe instructions. + * Since this is user ABI, we must enforce the sizing. + */ + BUILD_BUG_ON(sizeof(current->thread.spe) != ELF_NEVRREG * sizeof(u32)); + regs_set_return_msr(regs, regs->msr & ~MSR_SPE); + if (msr & MSR_SPE) { + /* restore spe registers from the stack */ + unsafe_copy_from_user(¤t->thread.spe, &sr->mc_vregs, + sizeof(current->thread.spe), failed); + current->thread.used_spe = true; + } else if (current->thread.used_spe) + memset(¤t->thread.spe, 0, sizeof(current->thread.spe)); + + /* Always get SPEFSCR back */ + unsafe_get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG, failed); +#endif /* CONFIG_SPE */ + + user_read_access_end(); + return 0; + +failed: + user_read_access_end(); + return 1; +} + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +/* + * Restore the current user register values from the user stack, except for + * MSR, and recheckpoint the original checkpointed register state for processes + * in transactions. + */ +static long restore_tm_user_regs(struct pt_regs *regs, + struct mcontext __user *sr, + struct mcontext __user *tm_sr) +{ + unsigned long msr, msr_hi; + int i; + + if (tm_suspend_disabled) + return 1; + /* + * restore general registers but not including MSR or SOFTE. Also + * take care of keeping r2 (TLS) intact if not a signal. + * See comment in signal_64.c:restore_tm_sigcontexts(); + * TFHAR is restored from the checkpointed NIP; TEXASR and TFIAR + * were set by the signal delivery. + */ + if (!user_read_access_begin(sr, sizeof(*sr))) + return 1; + + unsafe_restore_general_regs(¤t->thread.ckpt_regs, sr, failed); + unsafe_get_user(current->thread.tm_tfhar, &sr->mc_gregs[PT_NIP], failed); + unsafe_get_user(msr, &sr->mc_gregs[PT_MSR], failed); + + /* Restore the previous little-endian mode */ + regs_set_return_msr(regs, (regs->msr & ~MSR_LE) | (msr & MSR_LE)); + + regs_set_return_msr(regs, regs->msr & ~MSR_VEC); + if (msr & MSR_VEC) { + /* restore altivec registers from the stack */ + unsafe_copy_from_user(¤t->thread.ckvr_state, &sr->mc_vregs, + sizeof(sr->mc_vregs), failed); + current->thread.used_vr = true; + } else if (current->thread.used_vr) { + memset(¤t->thread.vr_state, 0, + ELF_NVRREG * sizeof(vector128)); + memset(¤t->thread.ckvr_state, 0, + ELF_NVRREG * sizeof(vector128)); + } + + /* Always get VRSAVE back */ + unsafe_get_user(current->thread.ckvrsave, + (u32 __user *)&sr->mc_vregs[32], failed); + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + mtspr(SPRN_VRSAVE, current->thread.ckvrsave); + + regs_set_return_msr(regs, regs->msr & ~(MSR_FP | MSR_FE0 | MSR_FE1)); + + unsafe_copy_fpr_from_user(current, &sr->mc_fregs, failed); + + regs_set_return_msr(regs, regs->msr & ~MSR_VSX); + if (msr & MSR_VSX) { + /* + * Restore altivec registers from the stack to a local + * buffer, then write this out to the thread_struct + */ + unsafe_copy_ckvsx_from_user(current, &sr->mc_vsregs, failed); + current->thread.used_vsr = true; + } else if (current->thread.used_vsr) + for (i = 0; i < 32 ; i++) { + current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0; + current->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET] = 0; + } + + user_read_access_end(); + + if (!user_read_access_begin(tm_sr, sizeof(*tm_sr))) + return 1; + + unsafe_restore_general_regs(regs, tm_sr, failed); + + /* restore altivec registers from the stack */ + if (msr & MSR_VEC) + unsafe_copy_from_user(¤t->thread.vr_state, &tm_sr->mc_vregs, + sizeof(sr->mc_vregs), failed); + + /* Always get VRSAVE back */ + unsafe_get_user(current->thread.vrsave, + (u32 __user *)&tm_sr->mc_vregs[32], failed); + + unsafe_copy_ckfpr_from_user(current, &tm_sr->mc_fregs, failed); + + if (msr & MSR_VSX) { + /* + * Restore altivec registers from the stack to a local + * buffer, then write this out to the thread_struct + */ + unsafe_copy_vsx_from_user(current, &tm_sr->mc_vsregs, failed); + current->thread.used_vsr = true; + } + + /* Get the top half of the MSR from the user context */ + unsafe_get_user(msr_hi, &tm_sr->mc_gregs[PT_MSR], failed); + msr_hi <<= 32; + + user_read_access_end(); + + /* If TM bits are set to the reserved value, it's an invalid context */ + if (MSR_TM_RESV(msr_hi)) + return 1; + + /* + * Disabling preemption, since it is unsafe to be preempted + * with MSR[TS] set without recheckpointing. + */ + preempt_disable(); + + /* + * CAUTION: + * After regs->MSR[TS] being updated, make sure that get_user(), + * put_user() or similar functions are *not* called. These + * functions can generate page faults which will cause the process + * to be de-scheduled with MSR[TS] set but without calling + * tm_recheckpoint(). This can cause a bug. + * + * Pull in the MSR TM bits from the user context + */ + regs_set_return_msr(regs, (regs->msr & ~MSR_TS_MASK) | (msr_hi & MSR_TS_MASK)); + /* Now, recheckpoint. This loads up all of the checkpointed (older) + * registers, including FP and V[S]Rs. After recheckpointing, the + * transactional versions should be loaded. + */ + tm_enable(); + /* Make sure the transaction is marked as failed */ + current->thread.tm_texasr |= TEXASR_FS; + /* This loads the checkpointed FP/VEC state, if used */ + tm_recheckpoint(¤t->thread); + + /* This loads the speculative FP/VEC state, if used */ + msr_check_and_set(msr & (MSR_FP | MSR_VEC)); + if (msr & MSR_FP) { + load_fp_state(¤t->thread.fp_state); + regs_set_return_msr(regs, regs->msr | (MSR_FP | current->thread.fpexc_mode)); + } + if (msr & MSR_VEC) { + load_vr_state(¤t->thread.vr_state); + regs_set_return_msr(regs, regs->msr | MSR_VEC); + } + + preempt_enable(); + + return 0; + +failed: + user_read_access_end(); + return 1; +} +#else +static long restore_tm_user_regs(struct pt_regs *regs, struct mcontext __user *sr, + struct mcontext __user *tm_sr) +{ + return 0; +} +#endif + +#ifdef CONFIG_PPC64 + +#define copy_siginfo_to_user copy_siginfo_to_user32 + +#endif /* CONFIG_PPC64 */ + +/* + * Set up a signal frame for a "real-time" signal handler + * (one which gets siginfo). + */ +int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset, + struct task_struct *tsk) +{ + struct rt_sigframe __user *frame; + struct mcontext __user *mctx; + struct mcontext __user *tm_mctx = NULL; + unsigned long newsp = 0; + unsigned long tramp; + struct pt_regs *regs = tsk->thread.regs; + /* Save the thread's msr before get_tm_stackpointer() changes it */ + unsigned long msr = regs->msr; + + /* Set up Signal Frame */ + frame = get_sigframe(ksig, tsk, sizeof(*frame), 1); + mctx = &frame->uc.uc_mcontext; +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + tm_mctx = &frame->uc_transact.uc_mcontext; +#endif + if (MSR_TM_ACTIVE(msr)) + prepare_save_tm_user_regs(); + else + prepare_save_user_regs(1); + + if (!user_access_begin(frame, sizeof(*frame))) + goto badframe; + + /* Put the siginfo & fill in most of the ucontext */ + unsafe_put_user(0, &frame->uc.uc_flags, failed); +#ifdef CONFIG_PPC64 + unsafe_compat_save_altstack(&frame->uc.uc_stack, regs->gpr[1], failed); +#else + unsafe_save_altstack(&frame->uc.uc_stack, regs->gpr[1], failed); +#endif + unsafe_put_user(to_user_ptr(&frame->uc.uc_mcontext), &frame->uc.uc_regs, failed); + + if (MSR_TM_ACTIVE(msr)) { +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + unsafe_put_user((unsigned long)&frame->uc_transact, + &frame->uc.uc_link, failed); + unsafe_put_user((unsigned long)tm_mctx, + &frame->uc_transact.uc_regs, failed); +#endif + unsafe_save_tm_user_regs(regs, mctx, tm_mctx, msr, failed); + } else { + unsafe_put_user(0, &frame->uc.uc_link, failed); + unsafe_save_user_regs(regs, mctx, tm_mctx, 1, failed); + } + + /* Save user registers on the stack */ + if (tsk->mm->context.vdso) { + tramp = VDSO32_SYMBOL(tsk->mm->context.vdso, sigtramp_rt32); + } else { + tramp = (unsigned long)mctx->mc_pad; + unsafe_put_user(PPC_RAW_LI(_R0, __NR_rt_sigreturn), &mctx->mc_pad[0], failed); + unsafe_put_user(PPC_RAW_SC(), &mctx->mc_pad[1], failed); + asm("dcbst %y0; sync; icbi %y0; sync" :: "Z" (mctx->mc_pad[0])); + } + unsafe_put_sigset_t(&frame->uc.uc_sigmask, oldset, failed); + + user_access_end(); + + if (copy_siginfo_to_user(&frame->info, &ksig->info)) + goto badframe; + + regs->link = tramp; + +#ifdef CONFIG_PPC_FPU_REGS + tsk->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */ +#endif + + /* create a stack frame for the caller of the handler */ + newsp = ((unsigned long)frame) - (__SIGNAL_FRAMESIZE + 16); + if (put_user(regs->gpr[1], (u32 __user *)newsp)) + goto badframe; + + /* Fill registers for signal handler */ + regs->gpr[1] = newsp; + regs->gpr[3] = ksig->sig; + regs->gpr[4] = (unsigned long)&frame->info; + regs->gpr[5] = (unsigned long)&frame->uc; + regs->gpr[6] = (unsigned long)frame; + regs_set_return_ip(regs, (unsigned long) ksig->ka.sa.sa_handler); + /* enter the signal handler in native-endian mode */ + regs_set_return_msr(regs, (regs->msr & ~MSR_LE) | (MSR_KERNEL & MSR_LE)); + + return 0; + +failed: + user_access_end(); + +badframe: + signal_fault(tsk, regs, "handle_rt_signal32", frame); + + return 1; +} + +/* + * OK, we're invoking a handler + */ +int handle_signal32(struct ksignal *ksig, sigset_t *oldset, + struct task_struct *tsk) +{ + struct sigcontext __user *sc; + struct sigframe __user *frame; + struct mcontext __user *mctx; + struct mcontext __user *tm_mctx = NULL; + unsigned long newsp = 0; + unsigned long tramp; + struct pt_regs *regs = tsk->thread.regs; + /* Save the thread's msr before get_tm_stackpointer() changes it */ + unsigned long msr = regs->msr; + + /* Set up Signal Frame */ + frame = get_sigframe(ksig, tsk, sizeof(*frame), 1); + mctx = &frame->mctx; +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + tm_mctx = &frame->mctx_transact; +#endif + if (MSR_TM_ACTIVE(msr)) + prepare_save_tm_user_regs(); + else + prepare_save_user_regs(1); + + if (!user_access_begin(frame, sizeof(*frame))) + goto badframe; + sc = (struct sigcontext __user *) &frame->sctx; + +#if _NSIG != 64 +#error "Please adjust handle_signal()" +#endif + unsafe_put_user(to_user_ptr(ksig->ka.sa.sa_handler), &sc->handler, failed); + unsafe_put_user(oldset->sig[0], &sc->oldmask, failed); +#ifdef CONFIG_PPC64 + unsafe_put_user((oldset->sig[0] >> 32), &sc->_unused[3], failed); +#else + unsafe_put_user(oldset->sig[1], &sc->_unused[3], failed); +#endif + unsafe_put_user(to_user_ptr(mctx), &sc->regs, failed); + unsafe_put_user(ksig->sig, &sc->signal, failed); + + if (MSR_TM_ACTIVE(msr)) + unsafe_save_tm_user_regs(regs, mctx, tm_mctx, msr, failed); + else + unsafe_save_user_regs(regs, mctx, tm_mctx, 1, failed); + + if (tsk->mm->context.vdso) { + tramp = VDSO32_SYMBOL(tsk->mm->context.vdso, sigtramp32); + } else { + tramp = (unsigned long)mctx->mc_pad; + unsafe_put_user(PPC_RAW_LI(_R0, __NR_sigreturn), &mctx->mc_pad[0], failed); + unsafe_put_user(PPC_RAW_SC(), &mctx->mc_pad[1], failed); + asm("dcbst %y0; sync; icbi %y0; sync" :: "Z" (mctx->mc_pad[0])); + } + user_access_end(); + + regs->link = tramp; + +#ifdef CONFIG_PPC_FPU_REGS + tsk->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */ +#endif + + /* create a stack frame for the caller of the handler */ + newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE; + if (put_user(regs->gpr[1], (u32 __user *)newsp)) + goto badframe; + + regs->gpr[1] = newsp; + regs->gpr[3] = ksig->sig; + regs->gpr[4] = (unsigned long) sc; + regs_set_return_ip(regs, (unsigned long) ksig->ka.sa.sa_handler); + /* enter the signal handler in native-endian mode */ + regs_set_return_msr(regs, (regs->msr & ~MSR_LE) | (MSR_KERNEL & MSR_LE)); + + return 0; + +failed: + user_access_end(); + +badframe: + signal_fault(tsk, regs, "handle_signal32", frame); + + return 1; +} + +static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig) +{ + sigset_t set; + struct mcontext __user *mcp; + + if (!user_read_access_begin(ucp, sizeof(*ucp))) + return -EFAULT; + + unsafe_get_sigset_t(&set, &ucp->uc_sigmask, failed); +#ifdef CONFIG_PPC64 + { + u32 cmcp; + + unsafe_get_user(cmcp, &ucp->uc_regs, failed); + mcp = (struct mcontext __user *)(u64)cmcp; + } +#else + unsafe_get_user(mcp, &ucp->uc_regs, failed); +#endif + user_read_access_end(); + + set_current_blocked(&set); + if (restore_user_regs(regs, mcp, sig)) + return -EFAULT; + + return 0; + +failed: + user_read_access_end(); + return -EFAULT; +} + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +static int do_setcontext_tm(struct ucontext __user *ucp, + struct ucontext __user *tm_ucp, + struct pt_regs *regs) +{ + sigset_t set; + struct mcontext __user *mcp; + struct mcontext __user *tm_mcp; + u32 cmcp; + u32 tm_cmcp; + + if (!user_read_access_begin(ucp, sizeof(*ucp))) + return -EFAULT; + + unsafe_get_sigset_t(&set, &ucp->uc_sigmask, failed); + unsafe_get_user(cmcp, &ucp->uc_regs, failed); + + user_read_access_end(); + + if (__get_user(tm_cmcp, &tm_ucp->uc_regs)) + return -EFAULT; + mcp = (struct mcontext __user *)(u64)cmcp; + tm_mcp = (struct mcontext __user *)(u64)tm_cmcp; + /* no need to check access_ok(mcp), since mcp < 4GB */ + + set_current_blocked(&set); + if (restore_tm_user_regs(regs, mcp, tm_mcp)) + return -EFAULT; + + return 0; + +failed: + user_read_access_end(); + return -EFAULT; +} +#endif + +#ifdef CONFIG_PPC64 +COMPAT_SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx, + struct ucontext __user *, new_ctx, int, ctx_size) +#else +SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx, + struct ucontext __user *, new_ctx, long, ctx_size) +#endif +{ + struct pt_regs *regs = current_pt_regs(); + int ctx_has_vsx_region = 0; + +#ifdef CONFIG_PPC64 + unsigned long new_msr = 0; + + if (new_ctx) { + struct mcontext __user *mcp; + u32 cmcp; + + /* + * Get pointer to the real mcontext. No need for + * access_ok since we are dealing with compat + * pointers. + */ + if (__get_user(cmcp, &new_ctx->uc_regs)) + return -EFAULT; + mcp = (struct mcontext __user *)(u64)cmcp; + if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR])) + return -EFAULT; + } + /* + * Check that the context is not smaller than the original + * size (with VMX but without VSX) + */ + if (ctx_size < UCONTEXTSIZEWITHOUTVSX) + return -EINVAL; + /* + * If the new context state sets the MSR VSX bits but + * it doesn't provide VSX state. + */ + if ((ctx_size < sizeof(struct ucontext)) && + (new_msr & MSR_VSX)) + return -EINVAL; + /* Does the context have enough room to store VSX data? */ + if (ctx_size >= sizeof(struct ucontext)) + ctx_has_vsx_region = 1; +#else + /* Context size is for future use. Right now, we only make sure + * we are passed something we understand + */ + if (ctx_size < sizeof(struct ucontext)) + return -EINVAL; +#endif + if (old_ctx != NULL) { + struct mcontext __user *mctx; + + /* + * old_ctx might not be 16-byte aligned, in which + * case old_ctx->uc_mcontext won't be either. + * Because we have the old_ctx->uc_pad2 field + * before old_ctx->uc_mcontext, we need to round down + * from &old_ctx->uc_mcontext to a 16-byte boundary. + */ + mctx = (struct mcontext __user *) + ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL); + prepare_save_user_regs(ctx_has_vsx_region); + if (!user_write_access_begin(old_ctx, ctx_size)) + return -EFAULT; + unsafe_save_user_regs(regs, mctx, NULL, ctx_has_vsx_region, failed); + unsafe_put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked, failed); + unsafe_put_user(to_user_ptr(mctx), &old_ctx->uc_regs, failed); + user_write_access_end(); + } + if (new_ctx == NULL) + return 0; + if (!access_ok(new_ctx, ctx_size) || + fault_in_readable((char __user *)new_ctx, ctx_size)) + return -EFAULT; + + /* + * If we get a fault copying the context into the kernel's + * image of the user's registers, we can't just return -EFAULT + * because the user's registers will be corrupted. For instance + * the NIP value may have been updated but not some of the + * other registers. Given that we have done the access_ok + * and successfully read the first and last bytes of the region + * above, this should only happen in an out-of-memory situation + * or if another thread unmaps the region containing the context. + * We kill the task with a SIGSEGV in this situation. + */ + if (do_setcontext(new_ctx, regs, 0)) { + force_exit_sig(SIGSEGV); + return -EFAULT; + } + + set_thread_flag(TIF_RESTOREALL); + return 0; + +failed: + user_write_access_end(); + return -EFAULT; +} + +#ifdef CONFIG_PPC64 +COMPAT_SYSCALL_DEFINE0(rt_sigreturn) +#else +SYSCALL_DEFINE0(rt_sigreturn) +#endif +{ + struct rt_sigframe __user *rt_sf; + struct pt_regs *regs = current_pt_regs(); + int tm_restore = 0; +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + struct ucontext __user *uc_transact; + unsigned long msr_hi; + unsigned long tmp; +#endif + /* Always make any pending restarted system calls return -EINTR */ + current->restart_block.fn = do_no_restart_syscall; + + rt_sf = (struct rt_sigframe __user *) + (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16); + if (!access_ok(rt_sf, sizeof(*rt_sf))) + goto bad; + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + /* + * If there is a transactional state then throw it away. + * The purpose of a sigreturn is to destroy all traces of the + * signal frame, this includes any transactional state created + * within in. We only check for suspended as we can never be + * active in the kernel, we are active, there is nothing better to + * do than go ahead and Bad Thing later. + * The cause is not important as there will never be a + * recheckpoint so it's not user visible. + */ + if (MSR_TM_SUSPENDED(mfmsr())) + tm_reclaim_current(0); + + if (__get_user(tmp, &rt_sf->uc.uc_link)) + goto bad; + uc_transact = (struct ucontext __user *)(uintptr_t)tmp; + if (uc_transact) { + u32 cmcp; + struct mcontext __user *mcp; + + if (__get_user(cmcp, &uc_transact->uc_regs)) + return -EFAULT; + mcp = (struct mcontext __user *)(u64)cmcp; + /* The top 32 bits of the MSR are stashed in the transactional + * ucontext. */ + if (__get_user(msr_hi, &mcp->mc_gregs[PT_MSR])) + goto bad; + + if (MSR_TM_ACTIVE(msr_hi<<32)) { + /* Trying to start TM on non TM system */ + if (!cpu_has_feature(CPU_FTR_TM)) + goto bad; + /* We only recheckpoint on return if we're + * transaction. + */ + tm_restore = 1; + if (do_setcontext_tm(&rt_sf->uc, uc_transact, regs)) + goto bad; + } + } + if (!tm_restore) { + /* + * Unset regs->msr because ucontext MSR TS is not + * set, and recheckpoint was not called. This avoid + * hitting a TM Bad thing at RFID + */ + regs_set_return_msr(regs, regs->msr & ~MSR_TS_MASK); + } + /* Fall through, for non-TM restore */ +#endif + if (!tm_restore) + if (do_setcontext(&rt_sf->uc, regs, 1)) + goto bad; + + /* + * It's not clear whether or why it is desirable to save the + * sigaltstack setting on signal delivery and restore it on + * signal return. But other architectures do this and we have + * always done it up until now so it is probably better not to + * change it. -- paulus + */ +#ifdef CONFIG_PPC64 + if (compat_restore_altstack(&rt_sf->uc.uc_stack)) + goto bad; +#else + if (restore_altstack(&rt_sf->uc.uc_stack)) + goto bad; +#endif + set_thread_flag(TIF_RESTOREALL); + return 0; + + bad: + signal_fault(current, regs, "sys_rt_sigreturn", rt_sf); + + force_sig(SIGSEGV); + return 0; +} + +#ifdef CONFIG_PPC32 +SYSCALL_DEFINE3(debug_setcontext, struct ucontext __user *, ctx, + int, ndbg, struct sig_dbg_op __user *, dbg) +{ + struct pt_regs *regs = current_pt_regs(); + struct sig_dbg_op op; + int i; + unsigned long new_msr = regs->msr; +#ifdef CONFIG_PPC_ADV_DEBUG_REGS + unsigned long new_dbcr0 = current->thread.debug.dbcr0; +#endif + + for (i=0; i<ndbg; i++) { + if (copy_from_user(&op, dbg + i, sizeof(op))) + return -EFAULT; + switch (op.dbg_type) { + case SIG_DBG_SINGLE_STEPPING: +#ifdef CONFIG_PPC_ADV_DEBUG_REGS + if (op.dbg_value) { + new_msr |= MSR_DE; + new_dbcr0 |= (DBCR0_IDM | DBCR0_IC); + } else { + new_dbcr0 &= ~DBCR0_IC; + if (!DBCR_ACTIVE_EVENTS(new_dbcr0, + current->thread.debug.dbcr1)) { + new_msr &= ~MSR_DE; + new_dbcr0 &= ~DBCR0_IDM; + } + } +#else + if (op.dbg_value) + new_msr |= MSR_SE; + else + new_msr &= ~MSR_SE; +#endif + break; + case SIG_DBG_BRANCH_TRACING: +#ifdef CONFIG_PPC_ADV_DEBUG_REGS + return -EINVAL; +#else + if (op.dbg_value) + new_msr |= MSR_BE; + else + new_msr &= ~MSR_BE; +#endif + break; + + default: + return -EINVAL; + } + } + + /* We wait until here to actually install the values in the + registers so if we fail in the above loop, it will not + affect the contents of these registers. After this point, + failure is a problem, anyway, and it's very unlikely unless + the user is really doing something wrong. */ + regs_set_return_msr(regs, new_msr); +#ifdef CONFIG_PPC_ADV_DEBUG_REGS + current->thread.debug.dbcr0 = new_dbcr0; +#endif + + if (!access_ok(ctx, sizeof(*ctx)) || + fault_in_readable((char __user *)ctx, sizeof(*ctx))) + return -EFAULT; + + /* + * If we get a fault copying the context into the kernel's + * image of the user's registers, we can't just return -EFAULT + * because the user's registers will be corrupted. For instance + * the NIP value may have been updated but not some of the + * other registers. Given that we have done the access_ok + * and successfully read the first and last bytes of the region + * above, this should only happen in an out-of-memory situation + * or if another thread unmaps the region containing the context. + * We kill the task with a SIGSEGV in this situation. + */ + if (do_setcontext(ctx, regs, 1)) { + signal_fault(current, regs, "sys_debug_setcontext", ctx); + + force_sig(SIGSEGV); + goto out; + } + + /* + * It's not clear whether or why it is desirable to save the + * sigaltstack setting on signal delivery and restore it on + * signal return. But other architectures do this and we have + * always done it up until now so it is probably better not to + * change it. -- paulus + */ + restore_altstack(&ctx->uc_stack); + + set_thread_flag(TIF_RESTOREALL); + out: + return 0; +} +#endif + +/* + * Do a signal return; undo the signal stack. + */ +#ifdef CONFIG_PPC64 +COMPAT_SYSCALL_DEFINE0(sigreturn) +#else +SYSCALL_DEFINE0(sigreturn) +#endif +{ + struct pt_regs *regs = current_pt_regs(); + struct sigframe __user *sf; + struct sigcontext __user *sc; + struct sigcontext sigctx; + struct mcontext __user *sr; + sigset_t set; + struct mcontext __user *mcp; + struct mcontext __user *tm_mcp = NULL; + unsigned long long msr_hi = 0; + + /* Always make any pending restarted system calls return -EINTR */ + current->restart_block.fn = do_no_restart_syscall; + + sf = (struct sigframe __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE); + sc = &sf->sctx; + if (copy_from_user(&sigctx, sc, sizeof(sigctx))) + goto badframe; + +#ifdef CONFIG_PPC64 + /* + * Note that PPC32 puts the upper 32 bits of the sigmask in the + * unused part of the signal stackframe + */ + set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32); +#else + set.sig[0] = sigctx.oldmask; + set.sig[1] = sigctx._unused[3]; +#endif + set_current_blocked(&set); + + mcp = (struct mcontext __user *)&sf->mctx; +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + tm_mcp = (struct mcontext __user *)&sf->mctx_transact; + if (__get_user(msr_hi, &tm_mcp->mc_gregs[PT_MSR])) + goto badframe; +#endif + if (MSR_TM_ACTIVE(msr_hi<<32)) { + if (!cpu_has_feature(CPU_FTR_TM)) + goto badframe; + if (restore_tm_user_regs(regs, mcp, tm_mcp)) + goto badframe; + } else { + sr = (struct mcontext __user *)from_user_ptr(sigctx.regs); + if (restore_user_regs(regs, sr, 1)) { + signal_fault(current, regs, "sys_sigreturn", sr); + + force_sig(SIGSEGV); + return 0; + } + } + + set_thread_flag(TIF_RESTOREALL); + return 0; + +badframe: + signal_fault(current, regs, "sys_sigreturn", sc); + + force_sig(SIGSEGV); + return 0; +} diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c new file mode 100644 index 000000000..86bb5bb4c --- /dev/null +++ b/arch/powerpc/kernel/signal_64.c @@ -0,0 +1,977 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * PowerPC version + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * + * Derived from "arch/i386/kernel/signal.c" + * Copyright (C) 1991, 1992 Linus Torvalds + * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson + */ + +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/kernel.h> +#include <linux/signal.h> +#include <linux/errno.h> +#include <linux/wait.h> +#include <linux/unistd.h> +#include <linux/stddef.h> +#include <linux/elf.h> +#include <linux/ptrace.h> +#include <linux/ratelimit.h> +#include <linux/syscalls.h> +#include <linux/pagemap.h> + +#include <asm/sigcontext.h> +#include <asm/ucontext.h> +#include <linux/uaccess.h> +#include <asm/unistd.h> +#include <asm/cacheflush.h> +#include <asm/syscalls.h> +#include <asm/vdso.h> +#include <asm/switch_to.h> +#include <asm/tm.h> +#include <asm/asm-prototypes.h> + +#include "signal.h" + + +#define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs)) +#define FP_REGS_SIZE sizeof(elf_fpregset_t) + +#define TRAMP_TRACEBACK 4 +#define TRAMP_SIZE 7 + +/* + * When we have signals to deliver, we set up on the user stack, + * going down from the original stack pointer: + * 1) a rt_sigframe struct which contains the ucontext + * 2) a gap of __SIGNAL_FRAMESIZE bytes which acts as a dummy caller + * frame for the signal handler. + */ + +struct rt_sigframe { + /* sys_rt_sigreturn requires the ucontext be the first field */ + struct ucontext uc; +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + struct ucontext uc_transact; +#endif + unsigned long _unused[2]; + unsigned int tramp[TRAMP_SIZE]; + struct siginfo __user *pinfo; + void __user *puc; + struct siginfo info; + /* New 64 bit little-endian ABI allows redzone of 512 bytes below sp */ + char abigap[USER_REDZONE_SIZE]; +} __attribute__ ((aligned (16))); + +unsigned long get_min_sigframe_size_64(void) +{ + return sizeof(struct rt_sigframe) + __SIGNAL_FRAMESIZE; +} + +/* + * This computes a quad word aligned pointer inside the vmx_reserve array + * element. For historical reasons sigcontext might not be quad word aligned, + * but the location we write the VMX regs to must be. See the comment in + * sigcontext for more detail. + */ +#ifdef CONFIG_ALTIVEC +static elf_vrreg_t __user *sigcontext_vmx_regs(struct sigcontext __user *sc) +{ + return (elf_vrreg_t __user *) (((unsigned long)sc->vmx_reserve + 15) & ~0xful); +} +#endif + +static void prepare_setup_sigcontext(struct task_struct *tsk) +{ +#ifdef CONFIG_ALTIVEC + /* save altivec registers */ + if (tsk->thread.used_vr) + flush_altivec_to_thread(tsk); + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + tsk->thread.vrsave = mfspr(SPRN_VRSAVE); +#endif /* CONFIG_ALTIVEC */ + + flush_fp_to_thread(tsk); + +#ifdef CONFIG_VSX + if (tsk->thread.used_vsr) + flush_vsx_to_thread(tsk); +#endif /* CONFIG_VSX */ +} + +/* + * Set up the sigcontext for the signal frame. + */ + +#define unsafe_setup_sigcontext(sc, tsk, signr, set, handler, ctx_has_vsx_region, label)\ +do { \ + if (__unsafe_setup_sigcontext(sc, tsk, signr, set, handler, ctx_has_vsx_region))\ + goto label; \ +} while (0) +static long notrace __unsafe_setup_sigcontext(struct sigcontext __user *sc, + struct task_struct *tsk, int signr, sigset_t *set, + unsigned long handler, int ctx_has_vsx_region) +{ + /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the + * process never used altivec yet (MSR_VEC is zero in pt_regs of + * the context). This is very important because we must ensure we + * don't lose the VRSAVE content that may have been set prior to + * the process doing its first vector operation + * Userland shall check AT_HWCAP to know whether it can rely on the + * v_regs pointer or not + */ +#ifdef CONFIG_ALTIVEC + elf_vrreg_t __user *v_regs = sigcontext_vmx_regs(sc); +#endif + struct pt_regs *regs = tsk->thread.regs; + unsigned long msr = regs->msr; + /* Force usr to always see softe as 1 (interrupts enabled) */ + unsigned long softe = 0x1; + + BUG_ON(tsk != current); + +#ifdef CONFIG_ALTIVEC + unsafe_put_user(v_regs, &sc->v_regs, efault_out); + + /* save altivec registers */ + if (tsk->thread.used_vr) { + /* Copy 33 vec registers (vr0..31 and vscr) to the stack */ + unsafe_copy_to_user(v_regs, &tsk->thread.vr_state, + 33 * sizeof(vector128), efault_out); + /* set MSR_VEC in the MSR value in the frame to indicate that sc->v_reg) + * contains valid data. + */ + msr |= MSR_VEC; + } + /* We always copy to/from vrsave, it's 0 if we don't have or don't + * use altivec. + */ + unsafe_put_user(tsk->thread.vrsave, (u32 __user *)&v_regs[33], efault_out); +#else /* CONFIG_ALTIVEC */ + unsafe_put_user(0, &sc->v_regs, efault_out); +#endif /* CONFIG_ALTIVEC */ + /* copy fpr regs and fpscr */ + unsafe_copy_fpr_to_user(&sc->fp_regs, tsk, efault_out); + + /* + * Clear the MSR VSX bit to indicate there is no valid state attached + * to this context, except in the specific case below where we set it. + */ + msr &= ~MSR_VSX; +#ifdef CONFIG_VSX + /* + * Copy VSX low doubleword to local buffer for formatting, + * then out to userspace. Update v_regs to point after the + * VMX data. + */ + if (tsk->thread.used_vsr && ctx_has_vsx_region) { + v_regs += ELF_NVRREG; + unsafe_copy_vsx_to_user(v_regs, tsk, efault_out); + /* set MSR_VSX in the MSR value in the frame to + * indicate that sc->vs_reg) contains valid data. + */ + msr |= MSR_VSX; + } +#endif /* CONFIG_VSX */ + unsafe_put_user(&sc->gp_regs, &sc->regs, efault_out); + unsafe_copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE, efault_out); + unsafe_put_user(msr, &sc->gp_regs[PT_MSR], efault_out); + unsafe_put_user(softe, &sc->gp_regs[PT_SOFTE], efault_out); + unsafe_put_user(signr, &sc->signal, efault_out); + unsafe_put_user(handler, &sc->handler, efault_out); + if (set != NULL) + unsafe_put_user(set->sig[0], &sc->oldmask, efault_out); + + return 0; + +efault_out: + return -EFAULT; +} + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +/* + * As above, but Transactional Memory is in use, so deliver sigcontexts + * containing checkpointed and transactional register states. + * + * To do this, we treclaim (done before entering here) to gather both sets of + * registers and set up the 'normal' sigcontext registers with rolled-back + * register values such that a simple signal handler sees a correct + * checkpointed register state. If interested, a TM-aware sighandler can + * examine the transactional registers in the 2nd sigcontext to determine the + * real origin of the signal. + */ +static long setup_tm_sigcontexts(struct sigcontext __user *sc, + struct sigcontext __user *tm_sc, + struct task_struct *tsk, + int signr, sigset_t *set, unsigned long handler, + unsigned long msr) +{ + /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the + * process never used altivec yet (MSR_VEC is zero in pt_regs of + * the context). This is very important because we must ensure we + * don't lose the VRSAVE content that may have been set prior to + * the process doing its first vector operation + * Userland shall check AT_HWCAP to know wether it can rely on the + * v_regs pointer or not. + */ +#ifdef CONFIG_ALTIVEC + elf_vrreg_t __user *v_regs = sigcontext_vmx_regs(sc); + elf_vrreg_t __user *tm_v_regs = sigcontext_vmx_regs(tm_sc); +#endif + struct pt_regs *regs = tsk->thread.regs; + long err = 0; + + BUG_ON(tsk != current); + + BUG_ON(!MSR_TM_ACTIVE(msr)); + + WARN_ON(tm_suspend_disabled); + + /* Restore checkpointed FP, VEC, and VSX bits from ckpt_regs as + * it contains the correct FP, VEC, VSX state after we treclaimed + * the transaction and giveup_all() was called on reclaiming. + */ + msr |= tsk->thread.ckpt_regs.msr & (MSR_FP | MSR_VEC | MSR_VSX); + +#ifdef CONFIG_ALTIVEC + err |= __put_user(v_regs, &sc->v_regs); + err |= __put_user(tm_v_regs, &tm_sc->v_regs); + + /* save altivec registers */ + if (tsk->thread.used_vr) { + /* Copy 33 vec registers (vr0..31 and vscr) to the stack */ + err |= __copy_to_user(v_regs, &tsk->thread.ckvr_state, + 33 * sizeof(vector128)); + /* If VEC was enabled there are transactional VRs valid too, + * else they're a copy of the checkpointed VRs. + */ + if (msr & MSR_VEC) + err |= __copy_to_user(tm_v_regs, + &tsk->thread.vr_state, + 33 * sizeof(vector128)); + else + err |= __copy_to_user(tm_v_regs, + &tsk->thread.ckvr_state, + 33 * sizeof(vector128)); + + /* set MSR_VEC in the MSR value in the frame to indicate + * that sc->v_reg contains valid data. + */ + msr |= MSR_VEC; + } + /* We always copy to/from vrsave, it's 0 if we don't have or don't + * use altivec. + */ + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + tsk->thread.ckvrsave = mfspr(SPRN_VRSAVE); + err |= __put_user(tsk->thread.ckvrsave, (u32 __user *)&v_regs[33]); + if (msr & MSR_VEC) + err |= __put_user(tsk->thread.vrsave, + (u32 __user *)&tm_v_regs[33]); + else + err |= __put_user(tsk->thread.ckvrsave, + (u32 __user *)&tm_v_regs[33]); + +#else /* CONFIG_ALTIVEC */ + err |= __put_user(0, &sc->v_regs); + err |= __put_user(0, &tm_sc->v_regs); +#endif /* CONFIG_ALTIVEC */ + + /* copy fpr regs and fpscr */ + err |= copy_ckfpr_to_user(&sc->fp_regs, tsk); + if (msr & MSR_FP) + err |= copy_fpr_to_user(&tm_sc->fp_regs, tsk); + else + err |= copy_ckfpr_to_user(&tm_sc->fp_regs, tsk); + +#ifdef CONFIG_VSX + /* + * Copy VSX low doubleword to local buffer for formatting, + * then out to userspace. Update v_regs to point after the + * VMX data. + */ + if (tsk->thread.used_vsr) { + v_regs += ELF_NVRREG; + tm_v_regs += ELF_NVRREG; + + err |= copy_ckvsx_to_user(v_regs, tsk); + + if (msr & MSR_VSX) + err |= copy_vsx_to_user(tm_v_regs, tsk); + else + err |= copy_ckvsx_to_user(tm_v_regs, tsk); + + /* set MSR_VSX in the MSR value in the frame to + * indicate that sc->vs_reg) contains valid data. + */ + msr |= MSR_VSX; + } +#endif /* CONFIG_VSX */ + + err |= __put_user(&sc->gp_regs, &sc->regs); + err |= __put_user(&tm_sc->gp_regs, &tm_sc->regs); + err |= __copy_to_user(&tm_sc->gp_regs, regs, GP_REGS_SIZE); + err |= __copy_to_user(&sc->gp_regs, + &tsk->thread.ckpt_regs, GP_REGS_SIZE); + err |= __put_user(msr, &tm_sc->gp_regs[PT_MSR]); + err |= __put_user(msr, &sc->gp_regs[PT_MSR]); + err |= __put_user(signr, &sc->signal); + err |= __put_user(handler, &sc->handler); + if (set != NULL) + err |= __put_user(set->sig[0], &sc->oldmask); + + return err; +} +#endif + +/* + * Restore the sigcontext from the signal frame. + */ +#define unsafe_restore_sigcontext(tsk, set, sig, sc, label) do { \ + if (__unsafe_restore_sigcontext(tsk, set, sig, sc)) \ + goto label; \ +} while (0) +static long notrace __unsafe_restore_sigcontext(struct task_struct *tsk, sigset_t *set, + int sig, struct sigcontext __user *sc) +{ +#ifdef CONFIG_ALTIVEC + elf_vrreg_t __user *v_regs; +#endif + unsigned long save_r13 = 0; + unsigned long msr; + struct pt_regs *regs = tsk->thread.regs; +#ifdef CONFIG_VSX + int i; +#endif + + BUG_ON(tsk != current); + + /* If this is not a signal return, we preserve the TLS in r13 */ + if (!sig) + save_r13 = regs->gpr[13]; + + /* copy the GPRs */ + unsafe_copy_from_user(regs->gpr, sc->gp_regs, sizeof(regs->gpr), efault_out); + unsafe_get_user(regs->nip, &sc->gp_regs[PT_NIP], efault_out); + /* get MSR separately, transfer the LE bit if doing signal return */ + unsafe_get_user(msr, &sc->gp_regs[PT_MSR], efault_out); + if (sig) + regs_set_return_msr(regs, (regs->msr & ~MSR_LE) | (msr & MSR_LE)); + unsafe_get_user(regs->orig_gpr3, &sc->gp_regs[PT_ORIG_R3], efault_out); + unsafe_get_user(regs->ctr, &sc->gp_regs[PT_CTR], efault_out); + unsafe_get_user(regs->link, &sc->gp_regs[PT_LNK], efault_out); + unsafe_get_user(regs->xer, &sc->gp_regs[PT_XER], efault_out); + unsafe_get_user(regs->ccr, &sc->gp_regs[PT_CCR], efault_out); + /* Don't allow userspace to set SOFTE */ + set_trap_norestart(regs); + unsafe_get_user(regs->dar, &sc->gp_regs[PT_DAR], efault_out); + unsafe_get_user(regs->dsisr, &sc->gp_regs[PT_DSISR], efault_out); + unsafe_get_user(regs->result, &sc->gp_regs[PT_RESULT], efault_out); + + if (!sig) + regs->gpr[13] = save_r13; + if (set != NULL) + unsafe_get_user(set->sig[0], &sc->oldmask, efault_out); + + /* + * Force reload of FP/VEC/VSX so userspace sees any changes. + * Clear these bits from the user process' MSR before copying into the + * thread struct. If we are rescheduled or preempted and another task + * uses FP/VEC/VSX, and this process has the MSR bits set, then the + * context switch code will save the current CPU state into the + * thread_struct - possibly overwriting the data we are updating here. + */ + regs_set_return_msr(regs, regs->msr & ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX)); + +#ifdef CONFIG_ALTIVEC + unsafe_get_user(v_regs, &sc->v_regs, efault_out); + if (v_regs && !access_ok(v_regs, 34 * sizeof(vector128))) + return -EFAULT; + /* Copy 33 vec registers (vr0..31 and vscr) from the stack */ + if (v_regs != NULL && (msr & MSR_VEC) != 0) { + unsafe_copy_from_user(&tsk->thread.vr_state, v_regs, + 33 * sizeof(vector128), efault_out); + tsk->thread.used_vr = true; + } else if (tsk->thread.used_vr) { + memset(&tsk->thread.vr_state, 0, 33 * sizeof(vector128)); + } + /* Always get VRSAVE back */ + if (v_regs != NULL) + unsafe_get_user(tsk->thread.vrsave, (u32 __user *)&v_regs[33], efault_out); + else + tsk->thread.vrsave = 0; + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + mtspr(SPRN_VRSAVE, tsk->thread.vrsave); +#endif /* CONFIG_ALTIVEC */ + /* restore floating point */ + unsafe_copy_fpr_from_user(tsk, &sc->fp_regs, efault_out); +#ifdef CONFIG_VSX + /* + * Get additional VSX data. Update v_regs to point after the + * VMX data. Copy VSX low doubleword from userspace to local + * buffer for formatting, then into the taskstruct. + */ + v_regs += ELF_NVRREG; + if ((msr & MSR_VSX) != 0) { + unsafe_copy_vsx_from_user(tsk, v_regs, efault_out); + tsk->thread.used_vsr = true; + } else { + for (i = 0; i < 32 ; i++) + tsk->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0; + } +#endif + return 0; + +efault_out: + return -EFAULT; +} + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +/* + * Restore the two sigcontexts from the frame of a transactional processes. + */ + +static long restore_tm_sigcontexts(struct task_struct *tsk, + struct sigcontext __user *sc, + struct sigcontext __user *tm_sc) +{ +#ifdef CONFIG_ALTIVEC + elf_vrreg_t __user *v_regs, *tm_v_regs; +#endif + unsigned long err = 0; + unsigned long msr; + struct pt_regs *regs = tsk->thread.regs; +#ifdef CONFIG_VSX + int i; +#endif + + BUG_ON(tsk != current); + + if (tm_suspend_disabled) + return -EINVAL; + + /* copy the GPRs */ + err |= __copy_from_user(regs->gpr, tm_sc->gp_regs, sizeof(regs->gpr)); + err |= __copy_from_user(&tsk->thread.ckpt_regs, sc->gp_regs, + sizeof(regs->gpr)); + + /* + * TFHAR is restored from the checkpointed 'wound-back' ucontext's NIP. + * TEXASR was set by the signal delivery reclaim, as was TFIAR. + * Users doing anything abhorrent like thread-switching w/ signals for + * TM-Suspended code will have to back TEXASR/TFIAR up themselves. + * For the case of getting a signal and simply returning from it, + * we don't need to re-copy them here. + */ + err |= __get_user(regs->nip, &tm_sc->gp_regs[PT_NIP]); + err |= __get_user(tsk->thread.tm_tfhar, &sc->gp_regs[PT_NIP]); + + /* get MSR separately, transfer the LE bit if doing signal return */ + err |= __get_user(msr, &sc->gp_regs[PT_MSR]); + /* Don't allow reserved mode. */ + if (MSR_TM_RESV(msr)) + return -EINVAL; + + /* pull in MSR LE from user context */ + regs_set_return_msr(regs, (regs->msr & ~MSR_LE) | (msr & MSR_LE)); + + /* The following non-GPR non-FPR non-VR state is also checkpointed: */ + err |= __get_user(regs->ctr, &tm_sc->gp_regs[PT_CTR]); + err |= __get_user(regs->link, &tm_sc->gp_regs[PT_LNK]); + err |= __get_user(regs->xer, &tm_sc->gp_regs[PT_XER]); + err |= __get_user(regs->ccr, &tm_sc->gp_regs[PT_CCR]); + err |= __get_user(tsk->thread.ckpt_regs.ctr, + &sc->gp_regs[PT_CTR]); + err |= __get_user(tsk->thread.ckpt_regs.link, + &sc->gp_regs[PT_LNK]); + err |= __get_user(tsk->thread.ckpt_regs.xer, + &sc->gp_regs[PT_XER]); + err |= __get_user(tsk->thread.ckpt_regs.ccr, + &sc->gp_regs[PT_CCR]); + /* Don't allow userspace to set SOFTE */ + set_trap_norestart(regs); + /* These regs are not checkpointed; they can go in 'regs'. */ + err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]); + err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]); + err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]); + + /* + * Force reload of FP/VEC. + * This has to be done before copying stuff into tsk->thread.fpr/vr + * for the reasons explained in the previous comment. + */ + regs_set_return_msr(regs, regs->msr & ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX)); + +#ifdef CONFIG_ALTIVEC + err |= __get_user(v_regs, &sc->v_regs); + err |= __get_user(tm_v_regs, &tm_sc->v_regs); + if (err) + return err; + if (v_regs && !access_ok(v_regs, 34 * sizeof(vector128))) + return -EFAULT; + if (tm_v_regs && !access_ok(tm_v_regs, 34 * sizeof(vector128))) + return -EFAULT; + /* Copy 33 vec registers (vr0..31 and vscr) from the stack */ + if (v_regs != NULL && tm_v_regs != NULL && (msr & MSR_VEC) != 0) { + err |= __copy_from_user(&tsk->thread.ckvr_state, v_regs, + 33 * sizeof(vector128)); + err |= __copy_from_user(&tsk->thread.vr_state, tm_v_regs, + 33 * sizeof(vector128)); + current->thread.used_vr = true; + } + else if (tsk->thread.used_vr) { + memset(&tsk->thread.vr_state, 0, 33 * sizeof(vector128)); + memset(&tsk->thread.ckvr_state, 0, 33 * sizeof(vector128)); + } + /* Always get VRSAVE back */ + if (v_regs != NULL && tm_v_regs != NULL) { + err |= __get_user(tsk->thread.ckvrsave, + (u32 __user *)&v_regs[33]); + err |= __get_user(tsk->thread.vrsave, + (u32 __user *)&tm_v_regs[33]); + } + else { + tsk->thread.vrsave = 0; + tsk->thread.ckvrsave = 0; + } + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + mtspr(SPRN_VRSAVE, tsk->thread.vrsave); +#endif /* CONFIG_ALTIVEC */ + /* restore floating point */ + err |= copy_fpr_from_user(tsk, &tm_sc->fp_regs); + err |= copy_ckfpr_from_user(tsk, &sc->fp_regs); +#ifdef CONFIG_VSX + /* + * Get additional VSX data. Update v_regs to point after the + * VMX data. Copy VSX low doubleword from userspace to local + * buffer for formatting, then into the taskstruct. + */ + if (v_regs && ((msr & MSR_VSX) != 0)) { + v_regs += ELF_NVRREG; + tm_v_regs += ELF_NVRREG; + err |= copy_vsx_from_user(tsk, tm_v_regs); + err |= copy_ckvsx_from_user(tsk, v_regs); + tsk->thread.used_vsr = true; + } else { + for (i = 0; i < 32 ; i++) { + tsk->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0; + tsk->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET] = 0; + } + } +#endif + tm_enable(); + /* Make sure the transaction is marked as failed */ + tsk->thread.tm_texasr |= TEXASR_FS; + + /* + * Disabling preemption, since it is unsafe to be preempted + * with MSR[TS] set without recheckpointing. + */ + preempt_disable(); + + /* pull in MSR TS bits from user context */ + regs_set_return_msr(regs, regs->msr | (msr & MSR_TS_MASK)); + + /* + * Ensure that TM is enabled in regs->msr before we leave the signal + * handler. It could be the case that (a) user disabled the TM bit + * through the manipulation of the MSR bits in uc_mcontext or (b) the + * TM bit was disabled because a sufficient number of context switches + * happened whilst in the signal handler and load_tm overflowed, + * disabling the TM bit. In either case we can end up with an illegal + * TM state leading to a TM Bad Thing when we return to userspace. + * + * CAUTION: + * After regs->MSR[TS] being updated, make sure that get_user(), + * put_user() or similar functions are *not* called. These + * functions can generate page faults which will cause the process + * to be de-scheduled with MSR[TS] set but without calling + * tm_recheckpoint(). This can cause a bug. + */ + regs_set_return_msr(regs, regs->msr | MSR_TM); + + /* This loads the checkpointed FP/VEC state, if used */ + tm_recheckpoint(&tsk->thread); + + msr_check_and_set(msr & (MSR_FP | MSR_VEC)); + if (msr & MSR_FP) { + load_fp_state(&tsk->thread.fp_state); + regs_set_return_msr(regs, regs->msr | (MSR_FP | tsk->thread.fpexc_mode)); + } + if (msr & MSR_VEC) { + load_vr_state(&tsk->thread.vr_state); + regs_set_return_msr(regs, regs->msr | MSR_VEC); + } + + preempt_enable(); + + return err; +} +#else /* !CONFIG_PPC_TRANSACTIONAL_MEM */ +static long restore_tm_sigcontexts(struct task_struct *tsk, struct sigcontext __user *sc, + struct sigcontext __user *tm_sc) +{ + return -EINVAL; +} +#endif + +/* + * Setup the trampoline code on the stack + */ +static long setup_trampoline(unsigned int syscall, unsigned int __user *tramp) +{ + int i; + long err = 0; + + /* Call the handler and pop the dummy stackframe*/ + err |= __put_user(PPC_RAW_BCTRL(), &tramp[0]); + err |= __put_user(PPC_RAW_ADDI(_R1, _R1, __SIGNAL_FRAMESIZE), &tramp[1]); + + err |= __put_user(PPC_RAW_LI(_R0, syscall), &tramp[2]); + err |= __put_user(PPC_RAW_SC(), &tramp[3]); + + /* Minimal traceback info */ + for (i=TRAMP_TRACEBACK; i < TRAMP_SIZE ;i++) + err |= __put_user(0, &tramp[i]); + + if (!err) + flush_icache_range((unsigned long) &tramp[0], + (unsigned long) &tramp[TRAMP_SIZE]); + + return err; +} + +/* + * Userspace code may pass a ucontext which doesn't include VSX added + * at the end. We need to check for this case. + */ +#define UCONTEXTSIZEWITHOUTVSX \ + (sizeof(struct ucontext) - 32*sizeof(long)) + +/* + * Handle {get,set,swap}_context operations + */ +SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx, + struct ucontext __user *, new_ctx, long, ctx_size) +{ + sigset_t set; + unsigned long new_msr = 0; + int ctx_has_vsx_region = 0; + + if (new_ctx && + get_user(new_msr, &new_ctx->uc_mcontext.gp_regs[PT_MSR])) + return -EFAULT; + /* + * Check that the context is not smaller than the original + * size (with VMX but without VSX) + */ + if (ctx_size < UCONTEXTSIZEWITHOUTVSX) + return -EINVAL; + /* + * If the new context state sets the MSR VSX bits but + * it doesn't provide VSX state. + */ + if ((ctx_size < sizeof(struct ucontext)) && + (new_msr & MSR_VSX)) + return -EINVAL; + /* Does the context have enough room to store VSX data? */ + if (ctx_size >= sizeof(struct ucontext)) + ctx_has_vsx_region = 1; + + if (old_ctx != NULL) { + prepare_setup_sigcontext(current); + if (!user_write_access_begin(old_ctx, ctx_size)) + return -EFAULT; + + unsafe_setup_sigcontext(&old_ctx->uc_mcontext, current, 0, NULL, + 0, ctx_has_vsx_region, efault_out); + unsafe_copy_to_user(&old_ctx->uc_sigmask, ¤t->blocked, + sizeof(sigset_t), efault_out); + + user_write_access_end(); + } + if (new_ctx == NULL) + return 0; + if (!access_ok(new_ctx, ctx_size) || + fault_in_readable((char __user *)new_ctx, ctx_size)) + return -EFAULT; + + /* + * If we get a fault copying the context into the kernel's + * image of the user's registers, we can't just return -EFAULT + * because the user's registers will be corrupted. For instance + * the NIP value may have been updated but not some of the + * other registers. Given that we have done the access_ok + * and successfully read the first and last bytes of the region + * above, this should only happen in an out-of-memory situation + * or if another thread unmaps the region containing the context. + * We kill the task with a SIGSEGV in this situation. + */ + + if (__get_user_sigset(&set, &new_ctx->uc_sigmask)) { + force_exit_sig(SIGSEGV); + return -EFAULT; + } + set_current_blocked(&set); + + if (!user_read_access_begin(new_ctx, ctx_size)) + return -EFAULT; + if (__unsafe_restore_sigcontext(current, NULL, 0, &new_ctx->uc_mcontext)) { + user_read_access_end(); + force_exit_sig(SIGSEGV); + return -EFAULT; + } + user_read_access_end(); + + /* This returns like rt_sigreturn */ + set_thread_flag(TIF_RESTOREALL); + + return 0; + +efault_out: + user_write_access_end(); + return -EFAULT; +} + + +/* + * Do a signal return; undo the signal stack. + */ + +SYSCALL_DEFINE0(rt_sigreturn) +{ + struct pt_regs *regs = current_pt_regs(); + struct ucontext __user *uc = (struct ucontext __user *)regs->gpr[1]; + sigset_t set; + unsigned long msr; + + /* Always make any pending restarted system calls return -EINTR */ + current->restart_block.fn = do_no_restart_syscall; + + if (!access_ok(uc, sizeof(*uc))) + goto badframe; + + if (__get_user_sigset(&set, &uc->uc_sigmask)) + goto badframe; + set_current_blocked(&set); + + if (IS_ENABLED(CONFIG_PPC_TRANSACTIONAL_MEM)) { + /* + * If there is a transactional state then throw it away. + * The purpose of a sigreturn is to destroy all traces of the + * signal frame, this includes any transactional state created + * within in. We only check for suspended as we can never be + * active in the kernel, we are active, there is nothing better to + * do than go ahead and Bad Thing later. + * The cause is not important as there will never be a + * recheckpoint so it's not user visible. + */ + if (MSR_TM_SUSPENDED(mfmsr())) + tm_reclaim_current(0); + + /* + * Disable MSR[TS] bit also, so, if there is an exception in the + * code below (as a page fault in copy_ckvsx_to_user()), it does + * not recheckpoint this task if there was a context switch inside + * the exception. + * + * A major page fault can indirectly call schedule(). A reschedule + * process in the middle of an exception can have a side effect + * (Changing the CPU MSR[TS] state), since schedule() is called + * with the CPU MSR[TS] disable and returns with MSR[TS]=Suspended + * (switch_to() calls tm_recheckpoint() for the 'new' process). In + * this case, the process continues to be the same in the CPU, but + * the CPU state just changed. + * + * This can cause a TM Bad Thing, since the MSR in the stack will + * have the MSR[TS]=0, and this is what will be used to RFID. + * + * Clearing MSR[TS] state here will avoid a recheckpoint if there + * is any process reschedule in kernel space. The MSR[TS] state + * does not need to be saved also, since it will be replaced with + * the MSR[TS] that came from user context later, at + * restore_tm_sigcontexts. + */ + regs_set_return_msr(regs, regs->msr & ~MSR_TS_MASK); + + if (__get_user(msr, &uc->uc_mcontext.gp_regs[PT_MSR])) + goto badframe; + } + + if (IS_ENABLED(CONFIG_PPC_TRANSACTIONAL_MEM) && MSR_TM_ACTIVE(msr)) { + /* We recheckpoint on return. */ + struct ucontext __user *uc_transact; + + /* Trying to start TM on non TM system */ + if (!cpu_has_feature(CPU_FTR_TM)) + goto badframe; + + if (__get_user(uc_transact, &uc->uc_link)) + goto badframe; + if (restore_tm_sigcontexts(current, &uc->uc_mcontext, + &uc_transact->uc_mcontext)) + goto badframe; + } else { + /* + * Fall through, for non-TM restore + * + * Unset MSR[TS] on the thread regs since MSR from user + * context does not have MSR active, and recheckpoint was + * not called since restore_tm_sigcontexts() was not called + * also. + * + * If not unsetting it, the code can RFID to userspace with + * MSR[TS] set, but without CPU in the proper state, + * causing a TM bad thing. + */ + regs_set_return_msr(current->thread.regs, + current->thread.regs->msr & ~MSR_TS_MASK); + if (!user_read_access_begin(&uc->uc_mcontext, sizeof(uc->uc_mcontext))) + goto badframe; + + unsafe_restore_sigcontext(current, NULL, 1, &uc->uc_mcontext, + badframe_block); + + user_read_access_end(); + } + + if (restore_altstack(&uc->uc_stack)) + goto badframe; + + set_thread_flag(TIF_RESTOREALL); + + return 0; + +badframe_block: + user_read_access_end(); +badframe: + signal_fault(current, regs, "rt_sigreturn", uc); + + force_sig(SIGSEGV); + return 0; +} + +int handle_rt_signal64(struct ksignal *ksig, sigset_t *set, + struct task_struct *tsk) +{ + struct rt_sigframe __user *frame; + unsigned long newsp = 0; + long err = 0; + struct pt_regs *regs = tsk->thread.regs; + /* Save the thread's msr before get_tm_stackpointer() changes it */ + unsigned long msr = regs->msr; + + frame = get_sigframe(ksig, tsk, sizeof(*frame), 0); + + /* + * This only applies when calling unsafe_setup_sigcontext() and must be + * called before opening the uaccess window. + */ + if (!MSR_TM_ACTIVE(msr)) + prepare_setup_sigcontext(tsk); + + if (!user_write_access_begin(frame, sizeof(*frame))) + goto badframe; + + unsafe_put_user(&frame->info, &frame->pinfo, badframe_block); + unsafe_put_user(&frame->uc, &frame->puc, badframe_block); + + /* Create the ucontext. */ + unsafe_put_user(0, &frame->uc.uc_flags, badframe_block); + unsafe_save_altstack(&frame->uc.uc_stack, regs->gpr[1], badframe_block); + + if (MSR_TM_ACTIVE(msr)) { +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + /* The ucontext_t passed to userland points to the second + * ucontext_t (for transactional state) with its uc_link ptr. + */ + unsafe_put_user(&frame->uc_transact, &frame->uc.uc_link, badframe_block); + + user_write_access_end(); + + err |= setup_tm_sigcontexts(&frame->uc.uc_mcontext, + &frame->uc_transact.uc_mcontext, + tsk, ksig->sig, NULL, + (unsigned long)ksig->ka.sa.sa_handler, + msr); + + if (!user_write_access_begin(&frame->uc.uc_sigmask, + sizeof(frame->uc.uc_sigmask))) + goto badframe; + +#endif + } else { + unsafe_put_user(0, &frame->uc.uc_link, badframe_block); + unsafe_setup_sigcontext(&frame->uc.uc_mcontext, tsk, ksig->sig, + NULL, (unsigned long)ksig->ka.sa.sa_handler, + 1, badframe_block); + } + + unsafe_copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set), badframe_block); + user_write_access_end(); + + /* Save the siginfo outside of the unsafe block. */ + if (copy_siginfo_to_user(&frame->info, &ksig->info)) + goto badframe; + + /* Make sure signal handler doesn't get spurious FP exceptions */ + tsk->thread.fp_state.fpscr = 0; + + /* Set up to return from userspace. */ + if (tsk->mm->context.vdso) { + regs_set_return_ip(regs, VDSO64_SYMBOL(tsk->mm->context.vdso, sigtramp_rt64)); + } else { + err |= setup_trampoline(__NR_rt_sigreturn, &frame->tramp[0]); + if (err) + goto badframe; + regs_set_return_ip(regs, (unsigned long) &frame->tramp[0]); + } + + /* Allocate a dummy caller frame for the signal handler. */ + newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE; + err |= put_user(regs->gpr[1], (unsigned long __user *)newsp); + + /* Set up "regs" so we "return" to the signal handler. */ + if (is_elf2_task()) { + regs->ctr = (unsigned long) ksig->ka.sa.sa_handler; + regs->gpr[12] = regs->ctr; + } else { + /* Handler is *really* a pointer to the function descriptor for + * the signal routine. The first entry in the function + * descriptor is the entry address of signal and the second + * entry is the TOC value we need to use. + */ + struct func_desc __user *ptr = + (struct func_desc __user *)ksig->ka.sa.sa_handler; + + err |= get_user(regs->ctr, &ptr->addr); + err |= get_user(regs->gpr[2], &ptr->toc); + } + + /* enter the signal handler in native-endian mode */ + regs_set_return_msr(regs, (regs->msr & ~MSR_LE) | (MSR_KERNEL & MSR_LE)); + regs->gpr[1] = newsp; + regs->gpr[3] = ksig->sig; + regs->result = 0; + if (ksig->ka.sa.sa_flags & SA_SIGINFO) { + regs->gpr[4] = (unsigned long)&frame->info; + regs->gpr[5] = (unsigned long)&frame->uc; + regs->gpr[6] = (unsigned long) frame; + } else { + regs->gpr[4] = (unsigned long)&frame->uc.uc_mcontext; + } + if (err) + goto badframe; + + return 0; + +badframe_block: + user_write_access_end(); +badframe: + signal_fault(current, regs, "handle_rt_signal64", frame); + + return 1; +} diff --git a/arch/powerpc/kernel/smp-tbsync.c b/arch/powerpc/kernel/smp-tbsync.c new file mode 100644 index 000000000..21c39355b --- /dev/null +++ b/arch/powerpc/kernel/smp-tbsync.c @@ -0,0 +1,171 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Smp timebase synchronization for ppc. + * + * Copyright (C) 2003 Samuel Rydh (samuel@ibrium.se) + * + */ + +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/smp.h> +#include <linux/unistd.h> +#include <linux/slab.h> +#include <linux/atomic.h> +#include <asm/smp.h> +#include <asm/time.h> + +#define NUM_ITER 300 + +enum { + kExit=0, kSetAndTest, kTest +}; + +static struct { + volatile u64 tb; + volatile u64 mark; + volatile int cmd; + volatile int handshake; + int filler[2]; + + volatile int ack; + int filler2[7]; + + volatile int race_result; +} *tbsync; + +static volatile int running; + +static void enter_contest(u64 mark, long add) +{ + while (get_tb() < mark) + tbsync->race_result = add; +} + +void smp_generic_take_timebase(void) +{ + int cmd; + u64 tb; + unsigned long flags; + + local_irq_save(flags); + while (!running) + barrier(); + rmb(); + + for (;;) { + tbsync->ack = 1; + while (!tbsync->handshake) + barrier(); + rmb(); + + cmd = tbsync->cmd; + tb = tbsync->tb; + mb(); + tbsync->ack = 0; + if (cmd == kExit) + break; + + while (tbsync->handshake) + barrier(); + if (cmd == kSetAndTest) + set_tb(tb >> 32, tb & 0xfffffffful); + enter_contest(tbsync->mark, -1); + } + local_irq_restore(flags); +} + +static int start_contest(int cmd, long offset, int num) +{ + int i, score=0; + u64 tb; + u64 mark; + + tbsync->cmd = cmd; + + local_irq_disable(); + for (i = -3; i < num; ) { + tb = get_tb() + 400; + tbsync->tb = tb + offset; + tbsync->mark = mark = tb + 400; + + wmb(); + + tbsync->handshake = 1; + while (tbsync->ack) + barrier(); + + while (get_tb() <= tb) + barrier(); + tbsync->handshake = 0; + enter_contest(mark, 1); + + while (!tbsync->ack) + barrier(); + + if (i++ > 0) + score += tbsync->race_result; + } + local_irq_enable(); + return score; +} + +void smp_generic_give_timebase(void) +{ + int i, score, score2, old, min=0, max=5000, offset=1000; + + pr_debug("Software timebase sync\n"); + + /* if this fails then this kernel won't work anyway... */ + tbsync = kzalloc( sizeof(*tbsync), GFP_KERNEL ); + mb(); + running = 1; + + while (!tbsync->ack) + barrier(); + + pr_debug("Got ack\n"); + + /* binary search */ + for (old = -1; old != offset ; offset = (min+max) / 2) { + score = start_contest(kSetAndTest, offset, NUM_ITER); + + pr_debug("score %d, offset %d\n", score, offset ); + + if( score > 0 ) + max = offset; + else + min = offset; + old = offset; + } + score = start_contest(kSetAndTest, min, NUM_ITER); + score2 = start_contest(kSetAndTest, max, NUM_ITER); + + pr_debug("Min %d (score %d), Max %d (score %d)\n", + min, score, max, score2); + score = abs(score); + score2 = abs(score2); + offset = (score < score2) ? min : max; + + /* guard against inaccurate mttb */ + for (i = 0; i < 10; i++) { + start_contest(kSetAndTest, offset, NUM_ITER/10); + + if ((score2 = start_contest(kTest, offset, NUM_ITER)) < 0) + score2 = -score2; + if (score2 <= score || score2 < 20) + break; + } + pr_debug("Final offset: %d (%d/%d)\n", offset, score2, NUM_ITER ); + + /* exiting */ + tbsync->cmd = kExit; + wmb(); + tbsync->handshake = 1; + while (tbsync->ack) + barrier(); + tbsync->handshake = 0; + kfree(tbsync); + tbsync = NULL; + running = 0; +} diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c new file mode 100644 index 000000000..0da6e5916 --- /dev/null +++ b/arch/powerpc/kernel/smp.c @@ -0,0 +1,1770 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * SMP support for ppc. + * + * Written by Cort Dougan (cort@cs.nmt.edu) borrowing a great + * deal of code from the sparc and intel versions. + * + * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu> + * + * PowerPC-64 Support added by Dave Engebretsen, Peter Bergner, and + * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com + */ + +#undef DEBUG + +#include <linux/kernel.h> +#include <linux/export.h> +#include <linux/sched/mm.h> +#include <linux/sched/task_stack.h> +#include <linux/sched/topology.h> +#include <linux/smp.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/spinlock.h> +#include <linux/cache.h> +#include <linux/err.h> +#include <linux/device.h> +#include <linux/cpu.h> +#include <linux/notifier.h> +#include <linux/topology.h> +#include <linux/profile.h> +#include <linux/processor.h> +#include <linux/random.h> +#include <linux/stackprotector.h> +#include <linux/pgtable.h> +#include <linux/clockchips.h> +#include <linux/kexec.h> + +#include <asm/ptrace.h> +#include <linux/atomic.h> +#include <asm/irq.h> +#include <asm/hw_irq.h> +#include <asm/kvm_ppc.h> +#include <asm/dbell.h> +#include <asm/page.h> +#include <asm/smp.h> +#include <asm/time.h> +#include <asm/machdep.h> +#include <asm/cputhreads.h> +#include <asm/cputable.h> +#include <asm/mpic.h> +#include <asm/vdso_datapage.h> +#ifdef CONFIG_PPC64 +#include <asm/paca.h> +#endif +#include <asm/vdso.h> +#include <asm/debug.h> +#include <asm/cpu_has_feature.h> +#include <asm/ftrace.h> +#include <asm/kup.h> +#include <asm/fadump.h> + +#ifdef DEBUG +#include <asm/udbg.h> +#define DBG(fmt...) udbg_printf(fmt) +#else +#define DBG(fmt...) +#endif + +#ifdef CONFIG_HOTPLUG_CPU +/* State of each CPU during hotplug phases */ +static DEFINE_PER_CPU(int, cpu_state) = { 0 }; +#endif + +struct task_struct *secondary_current; +bool has_big_cores; +bool coregroup_enabled; +bool thread_group_shares_l2; +bool thread_group_shares_l3; + +DEFINE_PER_CPU(cpumask_var_t, cpu_sibling_map); +DEFINE_PER_CPU(cpumask_var_t, cpu_smallcore_map); +DEFINE_PER_CPU(cpumask_var_t, cpu_l2_cache_map); +DEFINE_PER_CPU(cpumask_var_t, cpu_core_map); +static DEFINE_PER_CPU(cpumask_var_t, cpu_coregroup_map); + +EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); +EXPORT_PER_CPU_SYMBOL(cpu_l2_cache_map); +EXPORT_PER_CPU_SYMBOL(cpu_core_map); +EXPORT_SYMBOL_GPL(has_big_cores); + +enum { +#ifdef CONFIG_SCHED_SMT + smt_idx, +#endif + cache_idx, + mc_idx, + die_idx, +}; + +#define MAX_THREAD_LIST_SIZE 8 +#define THREAD_GROUP_SHARE_L1 1 +#define THREAD_GROUP_SHARE_L2_L3 2 +struct thread_groups { + unsigned int property; + unsigned int nr_groups; + unsigned int threads_per_group; + unsigned int thread_list[MAX_THREAD_LIST_SIZE]; +}; + +/* Maximum number of properties that groups of threads within a core can share */ +#define MAX_THREAD_GROUP_PROPERTIES 2 + +struct thread_groups_list { + unsigned int nr_properties; + struct thread_groups property_tgs[MAX_THREAD_GROUP_PROPERTIES]; +}; + +static struct thread_groups_list tgl[NR_CPUS] __initdata; +/* + * On big-cores system, thread_group_l1_cache_map for each CPU corresponds to + * the set its siblings that share the L1-cache. + */ +DEFINE_PER_CPU(cpumask_var_t, thread_group_l1_cache_map); + +/* + * On some big-cores system, thread_group_l2_cache_map for each CPU + * corresponds to the set its siblings within the core that share the + * L2-cache. + */ +DEFINE_PER_CPU(cpumask_var_t, thread_group_l2_cache_map); + +/* + * On P10, thread_group_l3_cache_map for each CPU is equal to the + * thread_group_l2_cache_map + */ +DEFINE_PER_CPU(cpumask_var_t, thread_group_l3_cache_map); + +/* SMP operations for this machine */ +struct smp_ops_t *smp_ops; + +/* Can't be static due to PowerMac hackery */ +volatile unsigned int cpu_callin_map[NR_CPUS]; + +int smt_enabled_at_boot = 1; + +/* + * Returns 1 if the specified cpu should be brought up during boot. + * Used to inhibit booting threads if they've been disabled or + * limited on the command line + */ +int smp_generic_cpu_bootable(unsigned int nr) +{ + /* Special case - we inhibit secondary thread startup + * during boot if the user requests it. + */ + if (system_state < SYSTEM_RUNNING && cpu_has_feature(CPU_FTR_SMT)) { + if (!smt_enabled_at_boot && cpu_thread_in_core(nr) != 0) + return 0; + if (smt_enabled_at_boot + && cpu_thread_in_core(nr) >= smt_enabled_at_boot) + return 0; + } + + return 1; +} + + +#ifdef CONFIG_PPC64 +int smp_generic_kick_cpu(int nr) +{ + if (nr < 0 || nr >= nr_cpu_ids) + return -EINVAL; + + /* + * The processor is currently spinning, waiting for the + * cpu_start field to become non-zero After we set cpu_start, + * the processor will continue on to secondary_start + */ + if (!paca_ptrs[nr]->cpu_start) { + paca_ptrs[nr]->cpu_start = 1; + smp_mb(); + return 0; + } + +#ifdef CONFIG_HOTPLUG_CPU + /* + * Ok it's not there, so it might be soft-unplugged, let's + * try to bring it back + */ + generic_set_cpu_up(nr); + smp_wmb(); + smp_send_reschedule(nr); +#endif /* CONFIG_HOTPLUG_CPU */ + + return 0; +} +#endif /* CONFIG_PPC64 */ + +static irqreturn_t call_function_action(int irq, void *data) +{ + generic_smp_call_function_interrupt(); + return IRQ_HANDLED; +} + +static irqreturn_t reschedule_action(int irq, void *data) +{ + scheduler_ipi(); + return IRQ_HANDLED; +} + +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST +static irqreturn_t tick_broadcast_ipi_action(int irq, void *data) +{ + timer_broadcast_interrupt(); + return IRQ_HANDLED; +} +#endif + +#ifdef CONFIG_NMI_IPI +static irqreturn_t nmi_ipi_action(int irq, void *data) +{ + smp_handle_nmi_ipi(get_irq_regs()); + return IRQ_HANDLED; +} +#endif + +static irq_handler_t smp_ipi_action[] = { + [PPC_MSG_CALL_FUNCTION] = call_function_action, + [PPC_MSG_RESCHEDULE] = reschedule_action, +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST + [PPC_MSG_TICK_BROADCAST] = tick_broadcast_ipi_action, +#endif +#ifdef CONFIG_NMI_IPI + [PPC_MSG_NMI_IPI] = nmi_ipi_action, +#endif +}; + +/* + * The NMI IPI is a fallback and not truly non-maskable. It is simpler + * than going through the call function infrastructure, and strongly + * serialized, so it is more appropriate for debugging. + */ +const char *smp_ipi_name[] = { + [PPC_MSG_CALL_FUNCTION] = "ipi call function", + [PPC_MSG_RESCHEDULE] = "ipi reschedule", +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST + [PPC_MSG_TICK_BROADCAST] = "ipi tick-broadcast", +#endif +#ifdef CONFIG_NMI_IPI + [PPC_MSG_NMI_IPI] = "nmi ipi", +#endif +}; + +/* optional function to request ipi, for controllers with >= 4 ipis */ +int smp_request_message_ipi(int virq, int msg) +{ + int err; + + if (msg < 0 || msg > PPC_MSG_NMI_IPI) + return -EINVAL; +#ifndef CONFIG_NMI_IPI + if (msg == PPC_MSG_NMI_IPI) + return 1; +#endif + + err = request_irq(virq, smp_ipi_action[msg], + IRQF_PERCPU | IRQF_NO_THREAD | IRQF_NO_SUSPEND, + smp_ipi_name[msg], NULL); + WARN(err < 0, "unable to request_irq %d for %s (rc %d)\n", + virq, smp_ipi_name[msg], err); + + return err; +} + +#ifdef CONFIG_PPC_SMP_MUXED_IPI +struct cpu_messages { + long messages; /* current messages */ +}; +static DEFINE_PER_CPU_SHARED_ALIGNED(struct cpu_messages, ipi_message); + +void smp_muxed_ipi_set_message(int cpu, int msg) +{ + struct cpu_messages *info = &per_cpu(ipi_message, cpu); + char *message = (char *)&info->messages; + + /* + * Order previous accesses before accesses in the IPI handler. + */ + smp_mb(); + message[msg] = 1; +} + +void smp_muxed_ipi_message_pass(int cpu, int msg) +{ + smp_muxed_ipi_set_message(cpu, msg); + + /* + * cause_ipi functions are required to include a full barrier + * before doing whatever causes the IPI. + */ + smp_ops->cause_ipi(cpu); +} + +#ifdef __BIG_ENDIAN__ +#define IPI_MESSAGE(A) (1uL << ((BITS_PER_LONG - 8) - 8 * (A))) +#else +#define IPI_MESSAGE(A) (1uL << (8 * (A))) +#endif + +irqreturn_t smp_ipi_demux(void) +{ + mb(); /* order any irq clear */ + + return smp_ipi_demux_relaxed(); +} + +/* sync-free variant. Callers should ensure synchronization */ +irqreturn_t smp_ipi_demux_relaxed(void) +{ + struct cpu_messages *info; + unsigned long all; + + info = this_cpu_ptr(&ipi_message); + do { + all = xchg(&info->messages, 0); +#if defined(CONFIG_KVM_XICS) && defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) + /* + * Must check for PPC_MSG_RM_HOST_ACTION messages + * before PPC_MSG_CALL_FUNCTION messages because when + * a VM is destroyed, we call kick_all_cpus_sync() + * to ensure that any pending PPC_MSG_RM_HOST_ACTION + * messages have completed before we free any VCPUs. + */ + if (all & IPI_MESSAGE(PPC_MSG_RM_HOST_ACTION)) + kvmppc_xics_ipi_action(); +#endif + if (all & IPI_MESSAGE(PPC_MSG_CALL_FUNCTION)) + generic_smp_call_function_interrupt(); + if (all & IPI_MESSAGE(PPC_MSG_RESCHEDULE)) + scheduler_ipi(); +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST + if (all & IPI_MESSAGE(PPC_MSG_TICK_BROADCAST)) + timer_broadcast_interrupt(); +#endif +#ifdef CONFIG_NMI_IPI + if (all & IPI_MESSAGE(PPC_MSG_NMI_IPI)) + nmi_ipi_action(0, NULL); +#endif + } while (info->messages); + + return IRQ_HANDLED; +} +#endif /* CONFIG_PPC_SMP_MUXED_IPI */ + +static inline void do_message_pass(int cpu, int msg) +{ + if (smp_ops->message_pass) + smp_ops->message_pass(cpu, msg); +#ifdef CONFIG_PPC_SMP_MUXED_IPI + else + smp_muxed_ipi_message_pass(cpu, msg); +#endif +} + +void smp_send_reschedule(int cpu) +{ + if (likely(smp_ops)) + do_message_pass(cpu, PPC_MSG_RESCHEDULE); +} +EXPORT_SYMBOL_GPL(smp_send_reschedule); + +void arch_send_call_function_single_ipi(int cpu) +{ + do_message_pass(cpu, PPC_MSG_CALL_FUNCTION); +} + +void arch_send_call_function_ipi_mask(const struct cpumask *mask) +{ + unsigned int cpu; + + for_each_cpu(cpu, mask) + do_message_pass(cpu, PPC_MSG_CALL_FUNCTION); +} + +#ifdef CONFIG_NMI_IPI + +/* + * "NMI IPI" system. + * + * NMI IPIs may not be recoverable, so should not be used as ongoing part of + * a running system. They can be used for crash, debug, halt/reboot, etc. + * + * The IPI call waits with interrupts disabled until all targets enter the + * NMI handler, then returns. Subsequent IPIs can be issued before targets + * have returned from their handlers, so there is no guarantee about + * concurrency or re-entrancy. + * + * A new NMI can be issued before all targets exit the handler. + * + * The IPI call may time out without all targets entering the NMI handler. + * In that case, there is some logic to recover (and ignore subsequent + * NMI interrupts that may eventually be raised), but the platform interrupt + * handler may not be able to distinguish this from other exception causes, + * which may cause a crash. + */ + +static atomic_t __nmi_ipi_lock = ATOMIC_INIT(0); +static struct cpumask nmi_ipi_pending_mask; +static bool nmi_ipi_busy = false; +static void (*nmi_ipi_function)(struct pt_regs *) = NULL; + +noinstr static void nmi_ipi_lock_start(unsigned long *flags) +{ + raw_local_irq_save(*flags); + hard_irq_disable(); + while (arch_atomic_cmpxchg(&__nmi_ipi_lock, 0, 1) == 1) { + raw_local_irq_restore(*flags); + spin_until_cond(arch_atomic_read(&__nmi_ipi_lock) == 0); + raw_local_irq_save(*flags); + hard_irq_disable(); + } +} + +noinstr static void nmi_ipi_lock(void) +{ + while (arch_atomic_cmpxchg(&__nmi_ipi_lock, 0, 1) == 1) + spin_until_cond(arch_atomic_read(&__nmi_ipi_lock) == 0); +} + +noinstr static void nmi_ipi_unlock(void) +{ + smp_mb(); + WARN_ON(arch_atomic_read(&__nmi_ipi_lock) != 1); + arch_atomic_set(&__nmi_ipi_lock, 0); +} + +noinstr static void nmi_ipi_unlock_end(unsigned long *flags) +{ + nmi_ipi_unlock(); + raw_local_irq_restore(*flags); +} + +/* + * Platform NMI handler calls this to ack + */ +noinstr int smp_handle_nmi_ipi(struct pt_regs *regs) +{ + void (*fn)(struct pt_regs *) = NULL; + unsigned long flags; + int me = raw_smp_processor_id(); + int ret = 0; + + /* + * Unexpected NMIs are possible here because the interrupt may not + * be able to distinguish NMI IPIs from other types of NMIs, or + * because the caller may have timed out. + */ + nmi_ipi_lock_start(&flags); + if (cpumask_test_cpu(me, &nmi_ipi_pending_mask)) { + cpumask_clear_cpu(me, &nmi_ipi_pending_mask); + fn = READ_ONCE(nmi_ipi_function); + WARN_ON_ONCE(!fn); + ret = 1; + } + nmi_ipi_unlock_end(&flags); + + if (fn) + fn(regs); + + return ret; +} + +static void do_smp_send_nmi_ipi(int cpu, bool safe) +{ + if (!safe && smp_ops->cause_nmi_ipi && smp_ops->cause_nmi_ipi(cpu)) + return; + + if (cpu >= 0) { + do_message_pass(cpu, PPC_MSG_NMI_IPI); + } else { + int c; + + for_each_online_cpu(c) { + if (c == raw_smp_processor_id()) + continue; + do_message_pass(c, PPC_MSG_NMI_IPI); + } + } +} + +/* + * - cpu is the target CPU (must not be this CPU), or NMI_IPI_ALL_OTHERS. + * - fn is the target callback function. + * - delay_us > 0 is the delay before giving up waiting for targets to + * begin executing the handler, == 0 specifies indefinite delay. + */ +static int __smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), + u64 delay_us, bool safe) +{ + unsigned long flags; + int me = raw_smp_processor_id(); + int ret = 1; + + BUG_ON(cpu == me); + BUG_ON(cpu < 0 && cpu != NMI_IPI_ALL_OTHERS); + + if (unlikely(!smp_ops)) + return 0; + + nmi_ipi_lock_start(&flags); + while (nmi_ipi_busy) { + nmi_ipi_unlock_end(&flags); + spin_until_cond(!nmi_ipi_busy); + nmi_ipi_lock_start(&flags); + } + nmi_ipi_busy = true; + nmi_ipi_function = fn; + + WARN_ON_ONCE(!cpumask_empty(&nmi_ipi_pending_mask)); + + if (cpu < 0) { + /* ALL_OTHERS */ + cpumask_copy(&nmi_ipi_pending_mask, cpu_online_mask); + cpumask_clear_cpu(me, &nmi_ipi_pending_mask); + } else { + cpumask_set_cpu(cpu, &nmi_ipi_pending_mask); + } + + nmi_ipi_unlock(); + + /* Interrupts remain hard disabled */ + + do_smp_send_nmi_ipi(cpu, safe); + + nmi_ipi_lock(); + /* nmi_ipi_busy is set here, so unlock/lock is okay */ + while (!cpumask_empty(&nmi_ipi_pending_mask)) { + nmi_ipi_unlock(); + udelay(1); + nmi_ipi_lock(); + if (delay_us) { + delay_us--; + if (!delay_us) + break; + } + } + + if (!cpumask_empty(&nmi_ipi_pending_mask)) { + /* Timeout waiting for CPUs to call smp_handle_nmi_ipi */ + ret = 0; + cpumask_clear(&nmi_ipi_pending_mask); + } + + nmi_ipi_function = NULL; + nmi_ipi_busy = false; + + nmi_ipi_unlock_end(&flags); + + return ret; +} + +int smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us) +{ + return __smp_send_nmi_ipi(cpu, fn, delay_us, false); +} + +int smp_send_safe_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us) +{ + return __smp_send_nmi_ipi(cpu, fn, delay_us, true); +} +#endif /* CONFIG_NMI_IPI */ + +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST +void tick_broadcast(const struct cpumask *mask) +{ + unsigned int cpu; + + for_each_cpu(cpu, mask) + do_message_pass(cpu, PPC_MSG_TICK_BROADCAST); +} +#endif + +#ifdef CONFIG_DEBUGGER +static void debugger_ipi_callback(struct pt_regs *regs) +{ + debugger_ipi(regs); +} + +void smp_send_debugger_break(void) +{ + smp_send_nmi_ipi(NMI_IPI_ALL_OTHERS, debugger_ipi_callback, 1000000); +} +#endif + +#ifdef CONFIG_KEXEC_CORE +void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *)) +{ + int cpu; + + smp_send_nmi_ipi(NMI_IPI_ALL_OTHERS, crash_ipi_callback, 1000000); + if (kdump_in_progress() && crash_wake_offline) { + for_each_present_cpu(cpu) { + if (cpu_online(cpu)) + continue; + /* + * crash_ipi_callback will wait for + * all cpus, including offline CPUs. + * We don't care about nmi_ipi_function. + * Offline cpus will jump straight into + * crash_ipi_callback, we can skip the + * entire NMI dance and waiting for + * cpus to clear pending mask, etc. + */ + do_smp_send_nmi_ipi(cpu, false); + } + } +} +#endif + +void crash_smp_send_stop(void) +{ + static bool stopped = false; + + /* + * In case of fadump, register data for all CPUs is captured by f/w + * on ibm,os-term rtas call. Skip IPI callbacks to other CPUs before + * this rtas call to avoid tricky post processing of those CPUs' + * backtraces. + */ + if (should_fadump_crash()) + return; + + if (stopped) + return; + + stopped = true; + +#ifdef CONFIG_KEXEC_CORE + if (kexec_crash_image) { + crash_kexec_prepare(); + return; + } +#endif + + smp_send_stop(); +} + +#ifdef CONFIG_NMI_IPI +static void nmi_stop_this_cpu(struct pt_regs *regs) +{ + /* + * IRQs are already hard disabled by the smp_handle_nmi_ipi. + */ + set_cpu_online(smp_processor_id(), false); + + spin_begin(); + while (1) + spin_cpu_relax(); +} + +void smp_send_stop(void) +{ + smp_send_nmi_ipi(NMI_IPI_ALL_OTHERS, nmi_stop_this_cpu, 1000000); +} + +#else /* CONFIG_NMI_IPI */ + +static void stop_this_cpu(void *dummy) +{ + hard_irq_disable(); + + /* + * Offlining CPUs in stop_this_cpu can result in scheduler warnings, + * (see commit de6e5d38417e), but printk_safe_flush_on_panic() wants + * to know other CPUs are offline before it breaks locks to flush + * printk buffers, in case we panic()ed while holding the lock. + */ + set_cpu_online(smp_processor_id(), false); + + spin_begin(); + while (1) + spin_cpu_relax(); +} + +void smp_send_stop(void) +{ + static bool stopped = false; + + /* + * Prevent waiting on csd lock from a previous smp_send_stop. + * This is racy, but in general callers try to do the right + * thing and only fire off one smp_send_stop (e.g., see + * kernel/panic.c) + */ + if (stopped) + return; + + stopped = true; + + smp_call_function(stop_this_cpu, NULL, 0); +} +#endif /* CONFIG_NMI_IPI */ + +static struct task_struct *current_set[NR_CPUS]; + +static void smp_store_cpu_info(int id) +{ + per_cpu(cpu_pvr, id) = mfspr(SPRN_PVR); +#ifdef CONFIG_PPC_E500 + per_cpu(next_tlbcam_idx, id) + = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1; +#endif +} + +/* + * Relationships between CPUs are maintained in a set of per-cpu cpumasks so + * rather than just passing around the cpumask we pass around a function that + * returns the that cpumask for the given CPU. + */ +static void set_cpus_related(int i, int j, struct cpumask *(*get_cpumask)(int)) +{ + cpumask_set_cpu(i, get_cpumask(j)); + cpumask_set_cpu(j, get_cpumask(i)); +} + +#ifdef CONFIG_HOTPLUG_CPU +static void set_cpus_unrelated(int i, int j, + struct cpumask *(*get_cpumask)(int)) +{ + cpumask_clear_cpu(i, get_cpumask(j)); + cpumask_clear_cpu(j, get_cpumask(i)); +} +#endif + +/* + * Extends set_cpus_related. Instead of setting one CPU at a time in + * dstmask, set srcmask at oneshot. dstmask should be super set of srcmask. + */ +static void or_cpumasks_related(int i, int j, struct cpumask *(*srcmask)(int), + struct cpumask *(*dstmask)(int)) +{ + struct cpumask *mask; + int k; + + mask = srcmask(j); + for_each_cpu(k, srcmask(i)) + cpumask_or(dstmask(k), dstmask(k), mask); + + if (i == j) + return; + + mask = srcmask(i); + for_each_cpu(k, srcmask(j)) + cpumask_or(dstmask(k), dstmask(k), mask); +} + +/* + * parse_thread_groups: Parses the "ibm,thread-groups" device tree + * property for the CPU device node @dn and stores + * the parsed output in the thread_groups_list + * structure @tglp. + * + * @dn: The device node of the CPU device. + * @tglp: Pointer to a thread group list structure into which the parsed + * output of "ibm,thread-groups" is stored. + * + * ibm,thread-groups[0..N-1] array defines which group of threads in + * the CPU-device node can be grouped together based on the property. + * + * This array can represent thread groupings for multiple properties. + * + * ibm,thread-groups[i + 0] tells us the property based on which the + * threads are being grouped together. If this value is 1, it implies + * that the threads in the same group share L1, translation cache. If + * the value is 2, it implies that the threads in the same group share + * the same L2 cache. + * + * ibm,thread-groups[i+1] tells us how many such thread groups exist for the + * property ibm,thread-groups[i] + * + * ibm,thread-groups[i+2] tells us the number of threads in each such + * group. + * Suppose k = (ibm,thread-groups[i+1] * ibm,thread-groups[i+2]), then, + * + * ibm,thread-groups[i+3..i+k+2] (is the list of threads identified by + * "ibm,ppc-interrupt-server#s" arranged as per their membership in + * the grouping. + * + * Example: + * If "ibm,thread-groups" = [1,2,4,8,10,12,14,9,11,13,15,2,2,4,8,10,12,14,9,11,13,15] + * This can be decomposed up into two consecutive arrays: + * a) [1,2,4,8,10,12,14,9,11,13,15] + * b) [2,2,4,8,10,12,14,9,11,13,15] + * + * where in, + * + * a) provides information of Property "1" being shared by "2" groups, + * each with "4" threads each. The "ibm,ppc-interrupt-server#s" of + * the first group is {8,10,12,14} and the + * "ibm,ppc-interrupt-server#s" of the second group is + * {9,11,13,15}. Property "1" is indicative of the thread in the + * group sharing L1 cache, translation cache and Instruction Data + * flow. + * + * b) provides information of Property "2" being shared by "2" groups, + * each group with "4" threads. The "ibm,ppc-interrupt-server#s" of + * the first group is {8,10,12,14} and the + * "ibm,ppc-interrupt-server#s" of the second group is + * {9,11,13,15}. Property "2" indicates that the threads in each + * group share the L2-cache. + * + * Returns 0 on success, -EINVAL if the property does not exist, + * -ENODATA if property does not have a value, and -EOVERFLOW if the + * property data isn't large enough. + */ +static int parse_thread_groups(struct device_node *dn, + struct thread_groups_list *tglp) +{ + unsigned int property_idx = 0; + u32 *thread_group_array; + size_t total_threads; + int ret = 0, count; + u32 *thread_list; + int i = 0; + + count = of_property_count_u32_elems(dn, "ibm,thread-groups"); + thread_group_array = kcalloc(count, sizeof(u32), GFP_KERNEL); + ret = of_property_read_u32_array(dn, "ibm,thread-groups", + thread_group_array, count); + if (ret) + goto out_free; + + while (i < count && property_idx < MAX_THREAD_GROUP_PROPERTIES) { + int j; + struct thread_groups *tg = &tglp->property_tgs[property_idx++]; + + tg->property = thread_group_array[i]; + tg->nr_groups = thread_group_array[i + 1]; + tg->threads_per_group = thread_group_array[i + 2]; + total_threads = tg->nr_groups * tg->threads_per_group; + + thread_list = &thread_group_array[i + 3]; + + for (j = 0; j < total_threads; j++) + tg->thread_list[j] = thread_list[j]; + i = i + 3 + total_threads; + } + + tglp->nr_properties = property_idx; + +out_free: + kfree(thread_group_array); + return ret; +} + +/* + * get_cpu_thread_group_start : Searches the thread group in tg->thread_list + * that @cpu belongs to. + * + * @cpu : The logical CPU whose thread group is being searched. + * @tg : The thread-group structure of the CPU node which @cpu belongs + * to. + * + * Returns the index to tg->thread_list that points to the start + * of the thread_group that @cpu belongs to. + * + * Returns -1 if cpu doesn't belong to any of the groups pointed to by + * tg->thread_list. + */ +static int get_cpu_thread_group_start(int cpu, struct thread_groups *tg) +{ + int hw_cpu_id = get_hard_smp_processor_id(cpu); + int i, j; + + for (i = 0; i < tg->nr_groups; i++) { + int group_start = i * tg->threads_per_group; + + for (j = 0; j < tg->threads_per_group; j++) { + int idx = group_start + j; + + if (tg->thread_list[idx] == hw_cpu_id) + return group_start; + } + } + + return -1; +} + +static struct thread_groups *__init get_thread_groups(int cpu, + int group_property, + int *err) +{ + struct device_node *dn = of_get_cpu_node(cpu, NULL); + struct thread_groups_list *cpu_tgl = &tgl[cpu]; + struct thread_groups *tg = NULL; + int i; + *err = 0; + + if (!dn) { + *err = -ENODATA; + return NULL; + } + + if (!cpu_tgl->nr_properties) { + *err = parse_thread_groups(dn, cpu_tgl); + if (*err) + goto out; + } + + for (i = 0; i < cpu_tgl->nr_properties; i++) { + if (cpu_tgl->property_tgs[i].property == group_property) { + tg = &cpu_tgl->property_tgs[i]; + break; + } + } + + if (!tg) + *err = -EINVAL; +out: + of_node_put(dn); + return tg; +} + +static int __init update_mask_from_threadgroup(cpumask_var_t *mask, struct thread_groups *tg, + int cpu, int cpu_group_start) +{ + int first_thread = cpu_first_thread_sibling(cpu); + int i; + + zalloc_cpumask_var_node(mask, GFP_KERNEL, cpu_to_node(cpu)); + + for (i = first_thread; i < first_thread + threads_per_core; i++) { + int i_group_start = get_cpu_thread_group_start(i, tg); + + if (unlikely(i_group_start == -1)) { + WARN_ON_ONCE(1); + return -ENODATA; + } + + if (i_group_start == cpu_group_start) + cpumask_set_cpu(i, *mask); + } + + return 0; +} + +static int __init init_thread_group_cache_map(int cpu, int cache_property) + +{ + int cpu_group_start = -1, err = 0; + struct thread_groups *tg = NULL; + cpumask_var_t *mask = NULL; + + if (cache_property != THREAD_GROUP_SHARE_L1 && + cache_property != THREAD_GROUP_SHARE_L2_L3) + return -EINVAL; + + tg = get_thread_groups(cpu, cache_property, &err); + + if (!tg) + return err; + + cpu_group_start = get_cpu_thread_group_start(cpu, tg); + + if (unlikely(cpu_group_start == -1)) { + WARN_ON_ONCE(1); + return -ENODATA; + } + + if (cache_property == THREAD_GROUP_SHARE_L1) { + mask = &per_cpu(thread_group_l1_cache_map, cpu); + update_mask_from_threadgroup(mask, tg, cpu, cpu_group_start); + } + else if (cache_property == THREAD_GROUP_SHARE_L2_L3) { + mask = &per_cpu(thread_group_l2_cache_map, cpu); + update_mask_from_threadgroup(mask, tg, cpu, cpu_group_start); + mask = &per_cpu(thread_group_l3_cache_map, cpu); + update_mask_from_threadgroup(mask, tg, cpu, cpu_group_start); + } + + + return 0; +} + +static bool shared_caches; + +#ifdef CONFIG_SCHED_SMT +/* cpumask of CPUs with asymmetric SMT dependency */ +static int powerpc_smt_flags(void) +{ + int flags = SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES; + + if (cpu_has_feature(CPU_FTR_ASYM_SMT)) { + printk_once(KERN_INFO "Enabling Asymmetric SMT scheduling\n"); + flags |= SD_ASYM_PACKING; + } + return flags; +} +#endif + +/* + * P9 has a slightly odd architecture where pairs of cores share an L2 cache. + * This topology makes it *much* cheaper to migrate tasks between adjacent cores + * since the migrated task remains cache hot. We want to take advantage of this + * at the scheduler level so an extra topology level is required. + */ +static int powerpc_shared_cache_flags(void) +{ + return SD_SHARE_PKG_RESOURCES; +} + +/* + * We can't just pass cpu_l2_cache_mask() directly because + * returns a non-const pointer and the compiler barfs on that. + */ +static const struct cpumask *shared_cache_mask(int cpu) +{ + return per_cpu(cpu_l2_cache_map, cpu); +} + +#ifdef CONFIG_SCHED_SMT +static const struct cpumask *smallcore_smt_mask(int cpu) +{ + return cpu_smallcore_mask(cpu); +} +#endif + +static struct cpumask *cpu_coregroup_mask(int cpu) +{ + return per_cpu(cpu_coregroup_map, cpu); +} + +static bool has_coregroup_support(void) +{ + return coregroup_enabled; +} + +static const struct cpumask *cpu_mc_mask(int cpu) +{ + return cpu_coregroup_mask(cpu); +} + +static struct sched_domain_topology_level powerpc_topology[] = { +#ifdef CONFIG_SCHED_SMT + { cpu_smt_mask, powerpc_smt_flags, SD_INIT_NAME(SMT) }, +#endif + { shared_cache_mask, powerpc_shared_cache_flags, SD_INIT_NAME(CACHE) }, + { cpu_mc_mask, SD_INIT_NAME(MC) }, + { cpu_cpu_mask, SD_INIT_NAME(DIE) }, + { NULL, }, +}; + +static int __init init_big_cores(void) +{ + int cpu; + + for_each_possible_cpu(cpu) { + int err = init_thread_group_cache_map(cpu, THREAD_GROUP_SHARE_L1); + + if (err) + return err; + + zalloc_cpumask_var_node(&per_cpu(cpu_smallcore_map, cpu), + GFP_KERNEL, + cpu_to_node(cpu)); + } + + has_big_cores = true; + + for_each_possible_cpu(cpu) { + int err = init_thread_group_cache_map(cpu, THREAD_GROUP_SHARE_L2_L3); + + if (err) + return err; + } + + thread_group_shares_l2 = true; + thread_group_shares_l3 = true; + pr_debug("L2/L3 cache only shared by the threads in the small core\n"); + + return 0; +} + +void __init smp_prepare_cpus(unsigned int max_cpus) +{ + unsigned int cpu; + + DBG("smp_prepare_cpus\n"); + + /* + * setup_cpu may need to be called on the boot cpu. We haven't + * spun any cpus up but lets be paranoid. + */ + BUG_ON(boot_cpuid != smp_processor_id()); + + /* Fixup boot cpu */ + smp_store_cpu_info(boot_cpuid); + cpu_callin_map[boot_cpuid] = 1; + + for_each_possible_cpu(cpu) { + zalloc_cpumask_var_node(&per_cpu(cpu_sibling_map, cpu), + GFP_KERNEL, cpu_to_node(cpu)); + zalloc_cpumask_var_node(&per_cpu(cpu_l2_cache_map, cpu), + GFP_KERNEL, cpu_to_node(cpu)); + zalloc_cpumask_var_node(&per_cpu(cpu_core_map, cpu), + GFP_KERNEL, cpu_to_node(cpu)); + if (has_coregroup_support()) + zalloc_cpumask_var_node(&per_cpu(cpu_coregroup_map, cpu), + GFP_KERNEL, cpu_to_node(cpu)); + +#ifdef CONFIG_NUMA + /* + * numa_node_id() works after this. + */ + if (cpu_present(cpu)) { + set_cpu_numa_node(cpu, numa_cpu_lookup_table[cpu]); + set_cpu_numa_mem(cpu, + local_memory_node(numa_cpu_lookup_table[cpu])); + } +#endif + } + + /* Init the cpumasks so the boot CPU is related to itself */ + cpumask_set_cpu(boot_cpuid, cpu_sibling_mask(boot_cpuid)); + cpumask_set_cpu(boot_cpuid, cpu_l2_cache_mask(boot_cpuid)); + cpumask_set_cpu(boot_cpuid, cpu_core_mask(boot_cpuid)); + + if (has_coregroup_support()) + cpumask_set_cpu(boot_cpuid, cpu_coregroup_mask(boot_cpuid)); + + init_big_cores(); + if (has_big_cores) { + cpumask_set_cpu(boot_cpuid, + cpu_smallcore_mask(boot_cpuid)); + } + + if (cpu_to_chip_id(boot_cpuid) != -1) { + int idx = DIV_ROUND_UP(num_possible_cpus(), threads_per_core); + + /* + * All threads of a core will all belong to the same core, + * chip_id_lookup_table will have one entry per core. + * Assumption: if boot_cpuid doesn't have a chip-id, then no + * other CPUs, will also not have chip-id. + */ + chip_id_lookup_table = kcalloc(idx, sizeof(int), GFP_KERNEL); + if (chip_id_lookup_table) + memset(chip_id_lookup_table, -1, sizeof(int) * idx); + } + + if (smp_ops && smp_ops->probe) + smp_ops->probe(); +} + +void smp_prepare_boot_cpu(void) +{ + BUG_ON(smp_processor_id() != boot_cpuid); +#ifdef CONFIG_PPC64 + paca_ptrs[boot_cpuid]->__current = current; +#endif + set_numa_node(numa_cpu_lookup_table[boot_cpuid]); + current_set[boot_cpuid] = current; +} + +#ifdef CONFIG_HOTPLUG_CPU + +int generic_cpu_disable(void) +{ + unsigned int cpu = smp_processor_id(); + + if (cpu == boot_cpuid) + return -EBUSY; + + set_cpu_online(cpu, false); +#ifdef CONFIG_PPC64 + vdso_data->processorCount--; +#endif + /* Update affinity of all IRQs previously aimed at this CPU */ + irq_migrate_all_off_this_cpu(); + + /* + * Depending on the details of the interrupt controller, it's possible + * that one of the interrupts we just migrated away from this CPU is + * actually already pending on this CPU. If we leave it in that state + * the interrupt will never be EOI'ed, and will never fire again. So + * temporarily enable interrupts here, to allow any pending interrupt to + * be received (and EOI'ed), before we take this CPU offline. + */ + local_irq_enable(); + mdelay(1); + local_irq_disable(); + + return 0; +} + +void generic_cpu_die(unsigned int cpu) +{ + int i; + + for (i = 0; i < 100; i++) { + smp_rmb(); + if (is_cpu_dead(cpu)) + return; + msleep(100); + } + printk(KERN_ERR "CPU%d didn't die...\n", cpu); +} + +void generic_set_cpu_dead(unsigned int cpu) +{ + per_cpu(cpu_state, cpu) = CPU_DEAD; +} + +/* + * The cpu_state should be set to CPU_UP_PREPARE in kick_cpu(), otherwise + * the cpu_state is always CPU_DEAD after calling generic_set_cpu_dead(), + * which makes the delay in generic_cpu_die() not happen. + */ +void generic_set_cpu_up(unsigned int cpu) +{ + per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; +} + +int generic_check_cpu_restart(unsigned int cpu) +{ + return per_cpu(cpu_state, cpu) == CPU_UP_PREPARE; +} + +int is_cpu_dead(unsigned int cpu) +{ + return per_cpu(cpu_state, cpu) == CPU_DEAD; +} + +static bool secondaries_inhibited(void) +{ + return kvm_hv_mode_active(); +} + +#else /* HOTPLUG_CPU */ + +#define secondaries_inhibited() 0 + +#endif + +static void cpu_idle_thread_init(unsigned int cpu, struct task_struct *idle) +{ +#ifdef CONFIG_PPC64 + paca_ptrs[cpu]->__current = idle; + paca_ptrs[cpu]->kstack = (unsigned long)task_stack_page(idle) + + THREAD_SIZE - STACK_FRAME_OVERHEAD; +#endif + task_thread_info(idle)->cpu = cpu; + secondary_current = current_set[cpu] = idle; +} + +int __cpu_up(unsigned int cpu, struct task_struct *tidle) +{ + const unsigned long boot_spin_ms = 5 * MSEC_PER_SEC; + const bool booting = system_state < SYSTEM_RUNNING; + const unsigned long hp_spin_ms = 1; + unsigned long deadline; + int rc; + const unsigned long spin_wait_ms = booting ? boot_spin_ms : hp_spin_ms; + + /* + * Don't allow secondary threads to come online if inhibited + */ + if (threads_per_core > 1 && secondaries_inhibited() && + cpu_thread_in_subcore(cpu)) + return -EBUSY; + + if (smp_ops == NULL || + (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu))) + return -EINVAL; + + cpu_idle_thread_init(cpu, tidle); + + /* + * The platform might need to allocate resources prior to bringing + * up the CPU + */ + if (smp_ops->prepare_cpu) { + rc = smp_ops->prepare_cpu(cpu); + if (rc) + return rc; + } + + /* Make sure callin-map entry is 0 (can be leftover a CPU + * hotplug + */ + cpu_callin_map[cpu] = 0; + + /* The information for processor bringup must + * be written out to main store before we release + * the processor. + */ + smp_mb(); + + /* wake up cpus */ + DBG("smp: kicking cpu %d\n", cpu); + rc = smp_ops->kick_cpu(cpu); + if (rc) { + pr_err("smp: failed starting cpu %d (rc %d)\n", cpu, rc); + return rc; + } + + /* + * At boot time, simply spin on the callin word until the + * deadline passes. + * + * At run time, spin for an optimistic amount of time to avoid + * sleeping in the common case. + */ + deadline = jiffies + msecs_to_jiffies(spin_wait_ms); + spin_until_cond(cpu_callin_map[cpu] || time_is_before_jiffies(deadline)); + + if (!cpu_callin_map[cpu] && system_state >= SYSTEM_RUNNING) { + const unsigned long sleep_interval_us = 10 * USEC_PER_MSEC; + const unsigned long sleep_wait_ms = 100 * MSEC_PER_SEC; + + deadline = jiffies + msecs_to_jiffies(sleep_wait_ms); + while (!cpu_callin_map[cpu] && time_is_after_jiffies(deadline)) + fsleep(sleep_interval_us); + } + + if (!cpu_callin_map[cpu]) { + printk(KERN_ERR "Processor %u is stuck.\n", cpu); + return -ENOENT; + } + + DBG("Processor %u found.\n", cpu); + + if (smp_ops->give_timebase) + smp_ops->give_timebase(); + + /* Wait until cpu puts itself in the online & active maps */ + spin_until_cond(cpu_online(cpu)); + + return 0; +} + +/* Return the value of the reg property corresponding to the given + * logical cpu. + */ +int cpu_to_core_id(int cpu) +{ + struct device_node *np; + int id = -1; + + np = of_get_cpu_node(cpu, NULL); + if (!np) + goto out; + + id = of_get_cpu_hwid(np, 0); +out: + of_node_put(np); + return id; +} +EXPORT_SYMBOL_GPL(cpu_to_core_id); + +/* Helper routines for cpu to core mapping */ +int cpu_core_index_of_thread(int cpu) +{ + return cpu >> threads_shift; +} +EXPORT_SYMBOL_GPL(cpu_core_index_of_thread); + +int cpu_first_thread_of_core(int core) +{ + return core << threads_shift; +} +EXPORT_SYMBOL_GPL(cpu_first_thread_of_core); + +/* Must be called when no change can occur to cpu_present_mask, + * i.e. during cpu online or offline. + */ +static struct device_node *cpu_to_l2cache(int cpu) +{ + struct device_node *np; + struct device_node *cache; + + if (!cpu_present(cpu)) + return NULL; + + np = of_get_cpu_node(cpu, NULL); + if (np == NULL) + return NULL; + + cache = of_find_next_cache_node(np); + + of_node_put(np); + + return cache; +} + +static bool update_mask_by_l2(int cpu, cpumask_var_t *mask) +{ + struct cpumask *(*submask_fn)(int) = cpu_sibling_mask; + struct device_node *l2_cache, *np; + int i; + + if (has_big_cores) + submask_fn = cpu_smallcore_mask; + + /* + * If the threads in a thread-group share L2 cache, then the + * L2-mask can be obtained from thread_group_l2_cache_map. + */ + if (thread_group_shares_l2) { + cpumask_set_cpu(cpu, cpu_l2_cache_mask(cpu)); + + for_each_cpu(i, per_cpu(thread_group_l2_cache_map, cpu)) { + if (cpu_online(i)) + set_cpus_related(i, cpu, cpu_l2_cache_mask); + } + + /* Verify that L1-cache siblings are a subset of L2 cache-siblings */ + if (!cpumask_equal(submask_fn(cpu), cpu_l2_cache_mask(cpu)) && + !cpumask_subset(submask_fn(cpu), cpu_l2_cache_mask(cpu))) { + pr_warn_once("CPU %d : Inconsistent L1 and L2 cache siblings\n", + cpu); + } + + return true; + } + + l2_cache = cpu_to_l2cache(cpu); + if (!l2_cache || !*mask) { + /* Assume only core siblings share cache with this CPU */ + for_each_cpu(i, cpu_sibling_mask(cpu)) + set_cpus_related(cpu, i, cpu_l2_cache_mask); + + return false; + } + + cpumask_and(*mask, cpu_online_mask, cpu_cpu_mask(cpu)); + + /* Update l2-cache mask with all the CPUs that are part of submask */ + or_cpumasks_related(cpu, cpu, submask_fn, cpu_l2_cache_mask); + + /* Skip all CPUs already part of current CPU l2-cache mask */ + cpumask_andnot(*mask, *mask, cpu_l2_cache_mask(cpu)); + + for_each_cpu(i, *mask) { + /* + * when updating the marks the current CPU has not been marked + * online, but we need to update the cache masks + */ + np = cpu_to_l2cache(i); + + /* Skip all CPUs already part of current CPU l2-cache */ + if (np == l2_cache) { + or_cpumasks_related(cpu, i, submask_fn, cpu_l2_cache_mask); + cpumask_andnot(*mask, *mask, submask_fn(i)); + } else { + cpumask_andnot(*mask, *mask, cpu_l2_cache_mask(i)); + } + + of_node_put(np); + } + of_node_put(l2_cache); + + return true; +} + +#ifdef CONFIG_HOTPLUG_CPU +static void remove_cpu_from_masks(int cpu) +{ + struct cpumask *(*mask_fn)(int) = cpu_sibling_mask; + int i; + + unmap_cpu_from_node(cpu); + + if (shared_caches) + mask_fn = cpu_l2_cache_mask; + + for_each_cpu(i, mask_fn(cpu)) { + set_cpus_unrelated(cpu, i, cpu_l2_cache_mask); + set_cpus_unrelated(cpu, i, cpu_sibling_mask); + if (has_big_cores) + set_cpus_unrelated(cpu, i, cpu_smallcore_mask); + } + + for_each_cpu(i, cpu_core_mask(cpu)) + set_cpus_unrelated(cpu, i, cpu_core_mask); + + if (has_coregroup_support()) { + for_each_cpu(i, cpu_coregroup_mask(cpu)) + set_cpus_unrelated(cpu, i, cpu_coregroup_mask); + } +} +#endif + +static inline void add_cpu_to_smallcore_masks(int cpu) +{ + int i; + + if (!has_big_cores) + return; + + cpumask_set_cpu(cpu, cpu_smallcore_mask(cpu)); + + for_each_cpu(i, per_cpu(thread_group_l1_cache_map, cpu)) { + if (cpu_online(i)) + set_cpus_related(i, cpu, cpu_smallcore_mask); + } +} + +static void update_coregroup_mask(int cpu, cpumask_var_t *mask) +{ + struct cpumask *(*submask_fn)(int) = cpu_sibling_mask; + int coregroup_id = cpu_to_coregroup_id(cpu); + int i; + + if (shared_caches) + submask_fn = cpu_l2_cache_mask; + + if (!*mask) { + /* Assume only siblings are part of this CPU's coregroup */ + for_each_cpu(i, submask_fn(cpu)) + set_cpus_related(cpu, i, cpu_coregroup_mask); + + return; + } + + cpumask_and(*mask, cpu_online_mask, cpu_cpu_mask(cpu)); + + /* Update coregroup mask with all the CPUs that are part of submask */ + or_cpumasks_related(cpu, cpu, submask_fn, cpu_coregroup_mask); + + /* Skip all CPUs already part of coregroup mask */ + cpumask_andnot(*mask, *mask, cpu_coregroup_mask(cpu)); + + for_each_cpu(i, *mask) { + /* Skip all CPUs not part of this coregroup */ + if (coregroup_id == cpu_to_coregroup_id(i)) { + or_cpumasks_related(cpu, i, submask_fn, cpu_coregroup_mask); + cpumask_andnot(*mask, *mask, submask_fn(i)); + } else { + cpumask_andnot(*mask, *mask, cpu_coregroup_mask(i)); + } + } +} + +static void add_cpu_to_masks(int cpu) +{ + struct cpumask *(*submask_fn)(int) = cpu_sibling_mask; + int first_thread = cpu_first_thread_sibling(cpu); + cpumask_var_t mask; + int chip_id = -1; + bool ret; + int i; + + /* + * This CPU will not be in the online mask yet so we need to manually + * add it to it's own thread sibling mask. + */ + map_cpu_to_node(cpu, cpu_to_node(cpu)); + cpumask_set_cpu(cpu, cpu_sibling_mask(cpu)); + cpumask_set_cpu(cpu, cpu_core_mask(cpu)); + + for (i = first_thread; i < first_thread + threads_per_core; i++) + if (cpu_online(i)) + set_cpus_related(i, cpu, cpu_sibling_mask); + + add_cpu_to_smallcore_masks(cpu); + + /* In CPU-hotplug path, hence use GFP_ATOMIC */ + ret = alloc_cpumask_var_node(&mask, GFP_ATOMIC, cpu_to_node(cpu)); + update_mask_by_l2(cpu, &mask); + + if (has_coregroup_support()) + update_coregroup_mask(cpu, &mask); + + if (chip_id_lookup_table && ret) + chip_id = cpu_to_chip_id(cpu); + + if (shared_caches) + submask_fn = cpu_l2_cache_mask; + + /* Update core_mask with all the CPUs that are part of submask */ + or_cpumasks_related(cpu, cpu, submask_fn, cpu_core_mask); + + /* Skip all CPUs already part of current CPU core mask */ + cpumask_andnot(mask, cpu_online_mask, cpu_core_mask(cpu)); + + /* If chip_id is -1; limit the cpu_core_mask to within DIE*/ + if (chip_id == -1) + cpumask_and(mask, mask, cpu_cpu_mask(cpu)); + + for_each_cpu(i, mask) { + if (chip_id == cpu_to_chip_id(i)) { + or_cpumasks_related(cpu, i, submask_fn, cpu_core_mask); + cpumask_andnot(mask, mask, submask_fn(i)); + } else { + cpumask_andnot(mask, mask, cpu_core_mask(i)); + } + } + + free_cpumask_var(mask); +} + +/* Activate a secondary processor. */ +void start_secondary(void *unused) +{ + unsigned int cpu = raw_smp_processor_id(); + + /* PPC64 calls setup_kup() in early_setup_secondary() */ + if (IS_ENABLED(CONFIG_PPC32)) + setup_kup(); + + mmgrab(&init_mm); + current->active_mm = &init_mm; + + smp_store_cpu_info(cpu); + set_dec(tb_ticks_per_jiffy); + rcu_cpu_starting(cpu); + cpu_callin_map[cpu] = 1; + + if (smp_ops->setup_cpu) + smp_ops->setup_cpu(cpu); + if (smp_ops->take_timebase) + smp_ops->take_timebase(); + + secondary_cpu_time_init(); + +#ifdef CONFIG_PPC64 + if (system_state == SYSTEM_RUNNING) + vdso_data->processorCount++; + + vdso_getcpu_init(); +#endif + set_numa_node(numa_cpu_lookup_table[cpu]); + set_numa_mem(local_memory_node(numa_cpu_lookup_table[cpu])); + + /* Update topology CPU masks */ + add_cpu_to_masks(cpu); + + /* + * Check for any shared caches. Note that this must be done on a + * per-core basis because one core in the pair might be disabled. + */ + if (!shared_caches) { + struct cpumask *(*sibling_mask)(int) = cpu_sibling_mask; + struct cpumask *mask = cpu_l2_cache_mask(cpu); + + if (has_big_cores) + sibling_mask = cpu_smallcore_mask; + + if (cpumask_weight(mask) > cpumask_weight(sibling_mask(cpu))) + shared_caches = true; + } + + smp_wmb(); + notify_cpu_starting(cpu); + set_cpu_online(cpu, true); + + boot_init_stack_canary(); + + local_irq_enable(); + + /* We can enable ftrace for secondary cpus now */ + this_cpu_enable_ftrace(); + + cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); + + BUG(); +} + +static void __init fixup_topology(void) +{ + int i; + +#ifdef CONFIG_SCHED_SMT + if (has_big_cores) { + pr_info("Big cores detected but using small core scheduling\n"); + powerpc_topology[smt_idx].mask = smallcore_smt_mask; + } +#endif + + if (!has_coregroup_support()) + powerpc_topology[mc_idx].mask = powerpc_topology[cache_idx].mask; + + /* + * Try to consolidate topology levels here instead of + * allowing scheduler to degenerate. + * - Dont consolidate if masks are different. + * - Dont consolidate if sd_flags exists and are different. + */ + for (i = 1; i <= die_idx; i++) { + if (powerpc_topology[i].mask != powerpc_topology[i - 1].mask) + continue; + + if (powerpc_topology[i].sd_flags && powerpc_topology[i - 1].sd_flags && + powerpc_topology[i].sd_flags != powerpc_topology[i - 1].sd_flags) + continue; + + if (!powerpc_topology[i - 1].sd_flags) + powerpc_topology[i - 1].sd_flags = powerpc_topology[i].sd_flags; + + powerpc_topology[i].mask = powerpc_topology[i + 1].mask; + powerpc_topology[i].sd_flags = powerpc_topology[i + 1].sd_flags; +#ifdef CONFIG_SCHED_DEBUG + powerpc_topology[i].name = powerpc_topology[i + 1].name; +#endif + } +} + +void __init smp_cpus_done(unsigned int max_cpus) +{ + /* + * We are running pinned to the boot CPU, see rest_init(). + */ + if (smp_ops && smp_ops->setup_cpu) + smp_ops->setup_cpu(boot_cpuid); + + if (smp_ops && smp_ops->bringup_done) + smp_ops->bringup_done(); + + dump_numa_cpu_topology(); + + fixup_topology(); + set_sched_topology(powerpc_topology); +} + +#ifdef CONFIG_HOTPLUG_CPU +int __cpu_disable(void) +{ + int cpu = smp_processor_id(); + int err; + + if (!smp_ops->cpu_disable) + return -ENOSYS; + + this_cpu_disable_ftrace(); + + err = smp_ops->cpu_disable(); + if (err) + return err; + + /* Update sibling maps */ + remove_cpu_from_masks(cpu); + + return 0; +} + +void __cpu_die(unsigned int cpu) +{ + if (smp_ops->cpu_die) + smp_ops->cpu_die(cpu); +} + +void arch_cpu_idle_dead(void) +{ + /* + * Disable on the down path. This will be re-enabled by + * start_secondary() via start_secondary_resume() below + */ + this_cpu_disable_ftrace(); + + if (smp_ops->cpu_offline_self) + smp_ops->cpu_offline_self(); + + /* If we return, we re-enter start_secondary */ + start_secondary_resume(); +} + +#endif diff --git a/arch/powerpc/kernel/stacktrace.c b/arch/powerpc/kernel/stacktrace.c new file mode 100644 index 000000000..a2443d617 --- /dev/null +++ b/arch/powerpc/kernel/stacktrace.c @@ -0,0 +1,228 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * Stack trace utility functions etc. + * + * Copyright 2008 Christoph Hellwig, IBM Corp. + * Copyright 2018 SUSE Linux GmbH + * Copyright 2018 Nick Piggin, Michael Ellerman, IBM Corp. + */ + +#include <linux/delay.h> +#include <linux/export.h> +#include <linux/kallsyms.h> +#include <linux/module.h> +#include <linux/nmi.h> +#include <linux/sched.h> +#include <linux/sched/debug.h> +#include <linux/sched/task_stack.h> +#include <linux/stacktrace.h> +#include <asm/ptrace.h> +#include <asm/processor.h> +#include <linux/ftrace.h> +#include <asm/kprobes.h> + +#include <asm/paca.h> + +void __no_sanitize_address arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie, + struct task_struct *task, struct pt_regs *regs) +{ + unsigned long sp; + + if (regs && !consume_entry(cookie, regs->nip)) + return; + + if (regs) + sp = regs->gpr[1]; + else if (task == current) + sp = current_stack_frame(); + else + sp = task->thread.ksp; + + for (;;) { + unsigned long *stack = (unsigned long *) sp; + unsigned long newsp, ip; + + if (!validate_sp(sp, task, STACK_FRAME_OVERHEAD)) + return; + + newsp = stack[0]; + ip = stack[STACK_FRAME_LR_SAVE]; + + if (!consume_entry(cookie, ip)) + return; + + sp = newsp; + } +} + +/* + * This function returns an error if it detects any unreliable features of the + * stack. Otherwise it guarantees that the stack trace is reliable. + * + * If the task is not 'current', the caller *must* ensure the task is inactive. + */ +int __no_sanitize_address arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, + void *cookie, struct task_struct *task) +{ + unsigned long sp; + unsigned long newsp; + unsigned long stack_page = (unsigned long)task_stack_page(task); + unsigned long stack_end; + int graph_idx = 0; + bool firstframe; + + stack_end = stack_page + THREAD_SIZE; + if (!is_idle_task(task)) { + /* + * For user tasks, this is the SP value loaded on + * kernel entry, see "PACAKSAVE(r13)" in _switch() and + * system_call_common()/EXCEPTION_PROLOG_COMMON(). + * + * Likewise for non-swapper kernel threads, + * this also happens to be the top of the stack + * as setup by copy_thread(). + * + * Note that stack backlinks are not properly setup by + * copy_thread() and thus, a forked task() will have + * an unreliable stack trace until it's been + * _switch()'ed to for the first time. + */ + stack_end -= STACK_FRAME_OVERHEAD + sizeof(struct pt_regs); + } else { + /* + * idle tasks have a custom stack layout, + * c.f. cpu_idle_thread_init(). + */ + stack_end -= STACK_FRAME_OVERHEAD; + } + + if (task == current) + sp = current_stack_frame(); + else + sp = task->thread.ksp; + + if (sp < stack_page + sizeof(struct thread_struct) || + sp > stack_end - STACK_FRAME_MIN_SIZE) { + return -EINVAL; + } + + for (firstframe = true; sp != stack_end; + firstframe = false, sp = newsp) { + unsigned long *stack = (unsigned long *) sp; + unsigned long ip; + + /* sanity check: ABI requires SP to be aligned 16 bytes. */ + if (sp & 0xF) + return -EINVAL; + + newsp = stack[0]; + /* Stack grows downwards; unwinder may only go up. */ + if (newsp <= sp) + return -EINVAL; + + if (newsp != stack_end && + newsp > stack_end - STACK_FRAME_MIN_SIZE) { + return -EINVAL; /* invalid backlink, too far up. */ + } + + /* + * We can only trust the bottom frame's backlink, the + * rest of the frame may be uninitialized, continue to + * the next. + */ + if (firstframe) + continue; + + /* Mark stacktraces with exception frames as unreliable. */ + if (sp <= stack_end - STACK_INT_FRAME_SIZE && + stack[STACK_FRAME_MARKER] == STACK_FRAME_REGS_MARKER) { + return -EINVAL; + } + + /* Examine the saved LR: it must point into kernel code. */ + ip = stack[STACK_FRAME_LR_SAVE]; + if (!__kernel_text_address(ip)) + return -EINVAL; + + /* + * FIXME: IMHO these tests do not belong in + * arch-dependent code, they are generic. + */ + ip = ftrace_graph_ret_addr(task, &graph_idx, ip, stack); +#ifdef CONFIG_KPROBES + /* + * Mark stacktraces with kretprobed functions on them + * as unreliable. + */ + if (ip == (unsigned long)__kretprobe_trampoline) + return -EINVAL; +#endif + + if (!consume_entry(cookie, ip)) + return -EINVAL; + } + return 0; +} + +#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_NMI_IPI) +static void handle_backtrace_ipi(struct pt_regs *regs) +{ + nmi_cpu_backtrace(regs); +} + +static void raise_backtrace_ipi(cpumask_t *mask) +{ + struct paca_struct *p; + unsigned int cpu; + u64 delay_us; + + for_each_cpu(cpu, mask) { + if (cpu == smp_processor_id()) { + handle_backtrace_ipi(NULL); + continue; + } + + delay_us = 5 * USEC_PER_SEC; + + if (smp_send_safe_nmi_ipi(cpu, handle_backtrace_ipi, delay_us)) { + // Now wait up to 5s for the other CPU to do its backtrace + while (cpumask_test_cpu(cpu, mask) && delay_us) { + udelay(1); + delay_us--; + } + + // Other CPU cleared itself from the mask + if (delay_us) + continue; + } + + p = paca_ptrs[cpu]; + + cpumask_clear_cpu(cpu, mask); + + pr_warn("CPU %d didn't respond to backtrace IPI, inspecting paca.\n", cpu); + if (!virt_addr_valid(p)) { + pr_warn("paca pointer appears corrupt? (%px)\n", p); + continue; + } + + pr_warn("irq_soft_mask: 0x%02x in_mce: %d in_nmi: %d", + p->irq_soft_mask, p->in_mce, p->in_nmi); + + if (virt_addr_valid(p->__current)) + pr_cont(" current: %d (%s)\n", p->__current->pid, + p->__current->comm); + else + pr_cont(" current pointer corrupt? (%px)\n", p->__current); + + pr_warn("Back trace of paca->saved_r1 (0x%016llx) (possibly stale):\n", p->saved_r1); + show_stack(p->__current, (unsigned long *)p->saved_r1, KERN_WARNING); + } +} + +void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self) +{ + nmi_trigger_cpumask_backtrace(mask, exclude_self, raise_backtrace_ipi); +} +#endif /* defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_NMI_IPI) */ diff --git a/arch/powerpc/kernel/static_call.c b/arch/powerpc/kernel/static_call.c new file mode 100644 index 000000000..863a7aa24 --- /dev/null +++ b/arch/powerpc/kernel/static_call.c @@ -0,0 +1,37 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/memory.h> +#include <linux/static_call.h> + +#include <asm/code-patching.h> + +void arch_static_call_transform(void *site, void *tramp, void *func, bool tail) +{ + int err; + bool is_ret0 = (func == __static_call_return0); + unsigned long target = (unsigned long)(is_ret0 ? tramp + PPC_SCT_RET0 : func); + bool is_short = is_offset_in_branch_range((long)target - (long)tramp); + + if (!tramp) + return; + + mutex_lock(&text_mutex); + + if (func && !is_short) { + err = patch_instruction(tramp + PPC_SCT_DATA, ppc_inst(target)); + if (err) + goto out; + } + + if (!func) + err = patch_instruction(tramp, ppc_inst(PPC_RAW_BLR())); + else if (is_short) + err = patch_branch(tramp, target, 0); + else + err = patch_instruction(tramp, ppc_inst(PPC_RAW_NOP())); +out: + mutex_unlock(&text_mutex); + + if (err) + panic("%s: patching failed %pS at %pS\n", __func__, func, tramp); +} +EXPORT_SYMBOL_GPL(arch_static_call_transform); diff --git a/arch/powerpc/kernel/suspend.c b/arch/powerpc/kernel/suspend.c new file mode 100644 index 000000000..b84992c10 --- /dev/null +++ b/arch/powerpc/kernel/suspend.c @@ -0,0 +1,23 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Suspend support specific for power. + * + * Copyright (c) 2002 Pavel Machek <pavel@ucw.cz> + * Copyright (c) 2001 Patrick Mochel <mochel@osdl.org> + */ + +#include <linux/mm.h> +#include <linux/suspend.h> +#include <asm/page.h> +#include <asm/sections.h> + +/* + * pfn_is_nosave - check if given pfn is in the 'nosave' section + */ + +int pfn_is_nosave(unsigned long pfn) +{ + unsigned long nosave_begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT; + unsigned long nosave_end_pfn = PAGE_ALIGN(__pa(&__nosave_end)) >> PAGE_SHIFT; + return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn); +} diff --git a/arch/powerpc/kernel/swsusp.c b/arch/powerpc/kernel/swsusp.c new file mode 100644 index 000000000..41dcb2175 --- /dev/null +++ b/arch/powerpc/kernel/swsusp.c @@ -0,0 +1,33 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Common powerpc suspend code for 32 and 64 bits + * + * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> + */ + +#include <linux/sched.h> +#include <linux/suspend.h> +#include <asm/current.h> +#include <asm/mmu_context.h> +#include <asm/switch_to.h> + +void save_processor_state(void) +{ + /* + * flush out all the special registers so we don't need + * to save them in the snapshot + */ + flush_all_to_thread(current); + +#ifdef CONFIG_PPC64 + hard_irq_disable(); +#endif + +} + +void restore_processor_state(void) +{ +#ifdef CONFIG_PPC32 + switch_mmu_context(current->active_mm, current->active_mm, NULL); +#endif +} diff --git a/arch/powerpc/kernel/swsusp_32.S b/arch/powerpc/kernel/swsusp_32.S new file mode 100644 index 000000000..e0cbd6300 --- /dev/null +++ b/arch/powerpc/kernel/swsusp_32.S @@ -0,0 +1,411 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include <linux/threads.h> +#include <asm/processor.h> +#include <asm/page.h> +#include <asm/cputable.h> +#include <asm/thread_info.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/mmu.h> +#include <asm/feature-fixups.h> + +/* + * Structure for storing CPU registers on the save area. + */ +#define SL_SP 0 +#define SL_PC 4 +#define SL_MSR 8 +#define SL_SDR1 0xc +#define SL_SPRG0 0x10 /* 4 sprg's */ +#define SL_DBAT0 0x20 +#define SL_IBAT0 0x28 +#define SL_DBAT1 0x30 +#define SL_IBAT1 0x38 +#define SL_DBAT2 0x40 +#define SL_IBAT2 0x48 +#define SL_DBAT3 0x50 +#define SL_IBAT3 0x58 +#define SL_DBAT4 0x60 +#define SL_IBAT4 0x68 +#define SL_DBAT5 0x70 +#define SL_IBAT5 0x78 +#define SL_DBAT6 0x80 +#define SL_IBAT6 0x88 +#define SL_DBAT7 0x90 +#define SL_IBAT7 0x98 +#define SL_TB 0xa0 +#define SL_R2 0xa8 +#define SL_CR 0xac +#define SL_LR 0xb0 +#define SL_R12 0xb4 /* r12 to r31 */ +#define SL_SIZE (SL_R12 + 80) + + .section .data + .align 5 + +_GLOBAL(swsusp_save_area) + .space SL_SIZE + + + .section .text + .align 5 + +_GLOBAL(swsusp_arch_suspend) + + lis r11,swsusp_save_area@h + ori r11,r11,swsusp_save_area@l + + mflr r0 + stw r0,SL_LR(r11) + mfcr r0 + stw r0,SL_CR(r11) + stw r1,SL_SP(r11) + stw r2,SL_R2(r11) + stmw r12,SL_R12(r11) + + /* Save MSR & SDR1 */ + mfmsr r4 + stw r4,SL_MSR(r11) + mfsdr1 r4 + stw r4,SL_SDR1(r11) + + /* Get a stable timebase and save it */ +1: mftbu r4 + stw r4,SL_TB(r11) + mftb r5 + stw r5,SL_TB+4(r11) + mftbu r3 + cmpw r3,r4 + bne 1b + + /* Save SPRGs */ + mfsprg r4,0 + stw r4,SL_SPRG0(r11) + mfsprg r4,1 + stw r4,SL_SPRG0+4(r11) + mfsprg r4,2 + stw r4,SL_SPRG0+8(r11) + mfsprg r4,3 + stw r4,SL_SPRG0+12(r11) + + /* Save BATs */ + mfdbatu r4,0 + stw r4,SL_DBAT0(r11) + mfdbatl r4,0 + stw r4,SL_DBAT0+4(r11) + mfdbatu r4,1 + stw r4,SL_DBAT1(r11) + mfdbatl r4,1 + stw r4,SL_DBAT1+4(r11) + mfdbatu r4,2 + stw r4,SL_DBAT2(r11) + mfdbatl r4,2 + stw r4,SL_DBAT2+4(r11) + mfdbatu r4,3 + stw r4,SL_DBAT3(r11) + mfdbatl r4,3 + stw r4,SL_DBAT3+4(r11) + mfibatu r4,0 + stw r4,SL_IBAT0(r11) + mfibatl r4,0 + stw r4,SL_IBAT0+4(r11) + mfibatu r4,1 + stw r4,SL_IBAT1(r11) + mfibatl r4,1 + stw r4,SL_IBAT1+4(r11) + mfibatu r4,2 + stw r4,SL_IBAT2(r11) + mfibatl r4,2 + stw r4,SL_IBAT2+4(r11) + mfibatu r4,3 + stw r4,SL_IBAT3(r11) + mfibatl r4,3 + stw r4,SL_IBAT3+4(r11) + +BEGIN_MMU_FTR_SECTION + mfspr r4,SPRN_DBAT4U + stw r4,SL_DBAT4(r11) + mfspr r4,SPRN_DBAT4L + stw r4,SL_DBAT4+4(r11) + mfspr r4,SPRN_DBAT5U + stw r4,SL_DBAT5(r11) + mfspr r4,SPRN_DBAT5L + stw r4,SL_DBAT5+4(r11) + mfspr r4,SPRN_DBAT6U + stw r4,SL_DBAT6(r11) + mfspr r4,SPRN_DBAT6L + stw r4,SL_DBAT6+4(r11) + mfspr r4,SPRN_DBAT7U + stw r4,SL_DBAT7(r11) + mfspr r4,SPRN_DBAT7L + stw r4,SL_DBAT7+4(r11) + mfspr r4,SPRN_IBAT4U + stw r4,SL_IBAT4(r11) + mfspr r4,SPRN_IBAT4L + stw r4,SL_IBAT4+4(r11) + mfspr r4,SPRN_IBAT5U + stw r4,SL_IBAT5(r11) + mfspr r4,SPRN_IBAT5L + stw r4,SL_IBAT5+4(r11) + mfspr r4,SPRN_IBAT6U + stw r4,SL_IBAT6(r11) + mfspr r4,SPRN_IBAT6L + stw r4,SL_IBAT6+4(r11) + mfspr r4,SPRN_IBAT7U + stw r4,SL_IBAT7(r11) + mfspr r4,SPRN_IBAT7L + stw r4,SL_IBAT7+4(r11) +END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS) + +#if 0 + /* Backup various CPU config stuffs */ + bl __save_cpu_setup +#endif + /* Call the low level suspend stuff (we should probably have made + * a stackframe... + */ + bl swsusp_save + + /* Restore LR from the save area */ + lis r11,swsusp_save_area@h + ori r11,r11,swsusp_save_area@l + lwz r0,SL_LR(r11) + mtlr r0 + + blr + + +/* Resume code */ +_GLOBAL(swsusp_arch_resume) + +#ifdef CONFIG_ALTIVEC + /* Stop pending alitvec streams and memory accesses */ +BEGIN_FTR_SECTION + PPC_DSSALL +END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) +#endif + sync + + /* Disable MSR:DR to make sure we don't take a TLB or + * hash miss during the copy, as our hash table will + * for a while be unusable. For .text, we assume we are + * covered by a BAT. This works only for non-G5 at this + * point. G5 will need a better approach, possibly using + * a small temporary hash table filled with large mappings, + * disabling the MMU completely isn't a good option for + * performance reasons. + * (Note that 750's may have the same performance issue as + * the G5 in this case, we should investigate using moving + * BATs for these CPUs) + */ + mfmsr r0 + sync + rlwinm r0,r0,0,28,26 /* clear MSR_DR */ + mtmsr r0 + sync + isync + + /* Load ptr the list of pages to copy in r3 */ + lis r11,(restore_pblist - KERNELBASE)@h + ori r11,r11,restore_pblist@l + lwz r10,0(r11) + + /* Copy the pages. This is a very basic implementation, to + * be replaced by something more cache efficient */ +1: + tophys(r3,r10) + li r0,256 + mtctr r0 + lwz r11,pbe_address(r3) /* source */ + tophys(r5,r11) + lwz r10,pbe_orig_address(r3) /* destination */ + tophys(r6,r10) +2: + lwz r8,0(r5) + lwz r9,4(r5) + lwz r10,8(r5) + lwz r11,12(r5) + addi r5,r5,16 + stw r8,0(r6) + stw r9,4(r6) + stw r10,8(r6) + stw r11,12(r6) + addi r6,r6,16 + bdnz 2b + lwz r10,pbe_next(r3) + cmpwi 0,r10,0 + bne 1b + + /* Do a very simple cache flush/inval of the L1 to ensure + * coherency of the icache + */ + lis r3,0x0002 + mtctr r3 + li r3, 0 +1: + lwz r0,0(r3) + addi r3,r3,0x0020 + bdnz 1b + isync + sync + + /* Now flush those cache lines */ + lis r3,0x0002 + mtctr r3 + li r3, 0 +1: + dcbf 0,r3 + addi r3,r3,0x0020 + bdnz 1b + sync + + /* Ok, we are now running with the kernel data of the old + * kernel fully restored. We can get to the save area + * easily now. As for the rest of the code, it assumes the + * loader kernel and the booted one are exactly identical + */ + lis r11,swsusp_save_area@h + ori r11,r11,swsusp_save_area@l + tophys(r11,r11) + +#if 0 + /* Restore various CPU config stuffs */ + bl __restore_cpu_setup +#endif + /* Restore the BATs, and SDR1. Then we can turn on the MMU. + * This is a bit hairy as we are running out of those BATs, + * but first, our code is probably in the icache, and we are + * writing the same value to the BAT, so that should be fine, + * though a better solution will have to be found long-term + */ + lwz r4,SL_SDR1(r11) + mtsdr1 r4 + lwz r4,SL_SPRG0(r11) + mtsprg 0,r4 + lwz r4,SL_SPRG0+4(r11) + mtsprg 1,r4 + lwz r4,SL_SPRG0+8(r11) + mtsprg 2,r4 + lwz r4,SL_SPRG0+12(r11) + mtsprg 3,r4 + +#if 0 + lwz r4,SL_DBAT0(r11) + mtdbatu 0,r4 + lwz r4,SL_DBAT0+4(r11) + mtdbatl 0,r4 + lwz r4,SL_DBAT1(r11) + mtdbatu 1,r4 + lwz r4,SL_DBAT1+4(r11) + mtdbatl 1,r4 + lwz r4,SL_DBAT2(r11) + mtdbatu 2,r4 + lwz r4,SL_DBAT2+4(r11) + mtdbatl 2,r4 + lwz r4,SL_DBAT3(r11) + mtdbatu 3,r4 + lwz r4,SL_DBAT3+4(r11) + mtdbatl 3,r4 + lwz r4,SL_IBAT0(r11) + mtibatu 0,r4 + lwz r4,SL_IBAT0+4(r11) + mtibatl 0,r4 + lwz r4,SL_IBAT1(r11) + mtibatu 1,r4 + lwz r4,SL_IBAT1+4(r11) + mtibatl 1,r4 + lwz r4,SL_IBAT2(r11) + mtibatu 2,r4 + lwz r4,SL_IBAT2+4(r11) + mtibatl 2,r4 + lwz r4,SL_IBAT3(r11) + mtibatu 3,r4 + lwz r4,SL_IBAT3+4(r11) + mtibatl 3,r4 +BEGIN_MMU_FTR_SECTION + lwz r4,SL_DBAT4(r11) + mtspr SPRN_DBAT4U,r4 + lwz r4,SL_DBAT4+4(r11) + mtspr SPRN_DBAT4L,r4 + lwz r4,SL_DBAT5(r11) + mtspr SPRN_DBAT5U,r4 + lwz r4,SL_DBAT5+4(r11) + mtspr SPRN_DBAT5L,r4 + lwz r4,SL_DBAT6(r11) + mtspr SPRN_DBAT6U,r4 + lwz r4,SL_DBAT6+4(r11) + mtspr SPRN_DBAT6L,r4 + lwz r4,SL_DBAT7(r11) + mtspr SPRN_DBAT7U,r4 + lwz r4,SL_DBAT7+4(r11) + mtspr SPRN_DBAT7L,r4 + lwz r4,SL_IBAT4(r11) + mtspr SPRN_IBAT4U,r4 + lwz r4,SL_IBAT4+4(r11) + mtspr SPRN_IBAT4L,r4 + lwz r4,SL_IBAT5(r11) + mtspr SPRN_IBAT5U,r4 + lwz r4,SL_IBAT5+4(r11) + mtspr SPRN_IBAT5L,r4 + lwz r4,SL_IBAT6(r11) + mtspr SPRN_IBAT6U,r4 + lwz r4,SL_IBAT6+4(r11) + mtspr SPRN_IBAT6L,r4 + lwz r4,SL_IBAT7(r11) + mtspr SPRN_IBAT7U,r4 + lwz r4,SL_IBAT7+4(r11) + mtspr SPRN_IBAT7L,r4 +END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS) +#endif + + /* Flush all TLBs */ + lis r4,0x1000 +1: addic. r4,r4,-0x1000 + tlbie r4 + bgt 1b + sync + + /* restore the MSR and turn on the MMU */ + lwz r3,SL_MSR(r11) + bl turn_on_mmu + tovirt(r11,r11) + + /* Restore TB */ + li r3,0 + mttbl r3 + lwz r3,SL_TB(r11) + lwz r4,SL_TB+4(r11) + mttbu r3 + mttbl r4 + + /* Kick decrementer */ + li r0,1 + mtdec r0 + + /* Restore the callee-saved registers and return */ + lwz r0,SL_CR(r11) + mtcr r0 + lwz r2,SL_R2(r11) + lmw r12,SL_R12(r11) + lwz r1,SL_SP(r11) + lwz r0,SL_LR(r11) + mtlr r0 + + // XXX Note: we don't really need to call swsusp_resume + + li r3,0 + blr +_ASM_NOKPROBE_SYMBOL(swsusp_arch_resume) + +/* FIXME:This construct is actually not useful since we don't shut + * down the instruction MMU, we could just flip back MSR-DR on. + */ +turn_on_mmu: + mflr r4 + mtsrr0 r4 + mtsrr1 r3 + sync + isync + rfi +_ASM_NOKPROBE_SYMBOL(turn_on_mmu) + diff --git a/arch/powerpc/kernel/swsusp_64.c b/arch/powerpc/kernel/swsusp_64.c new file mode 100644 index 000000000..16ee3baaf --- /dev/null +++ b/arch/powerpc/kernel/swsusp_64.c @@ -0,0 +1,19 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * PowerPC 64-bit swsusp implementation + * + * Copyright 2006 Johannes Berg <johannes@sipsolutions.net> + */ + +#include <asm/iommu.h> +#include <linux/irq.h> +#include <linux/sched.h> +#include <linux/interrupt.h> +#include <linux/nmi.h> + +void do_after_copyback(void) +{ + iommu_restore(); + touch_softlockup_watchdog(); + mb(); +} diff --git a/arch/powerpc/kernel/swsusp_85xx.S b/arch/powerpc/kernel/swsusp_85xx.S new file mode 100644 index 000000000..88cfdbd53 --- /dev/null +++ b/arch/powerpc/kernel/swsusp_85xx.S @@ -0,0 +1,202 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Based on swsusp_32.S, modified for FSL BookE by + * Anton Vorontsov <avorontsov@ru.mvista.com> + * Copyright (c) 2009-2010 MontaVista Software, LLC. + */ + +#include <linux/threads.h> +#include <asm/processor.h> +#include <asm/page.h> +#include <asm/cputable.h> +#include <asm/thread_info.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/mmu.h> + +/* + * Structure for storing CPU registers on the save area. + */ +#define SL_SP 0 +#define SL_PC 4 +#define SL_MSR 8 +#define SL_TCR 0xc +#define SL_SPRG0 0x10 +#define SL_SPRG1 0x14 +#define SL_SPRG2 0x18 +#define SL_SPRG3 0x1c +#define SL_SPRG4 0x20 +#define SL_SPRG5 0x24 +#define SL_SPRG6 0x28 +#define SL_SPRG7 0x2c +#define SL_TBU 0x30 +#define SL_TBL 0x34 +#define SL_R2 0x38 +#define SL_CR 0x3c +#define SL_LR 0x40 +#define SL_R12 0x44 /* r12 to r31 */ +#define SL_SIZE (SL_R12 + 80) + + .section .data + .align 5 + +_GLOBAL(swsusp_save_area) + .space SL_SIZE + + + .section .text + .align 5 + +_GLOBAL(swsusp_arch_suspend) + lis r11,swsusp_save_area@h + ori r11,r11,swsusp_save_area@l + + mflr r0 + stw r0,SL_LR(r11) + mfcr r0 + stw r0,SL_CR(r11) + stw r1,SL_SP(r11) + stw r2,SL_R2(r11) + stmw r12,SL_R12(r11) + + /* Save MSR & TCR */ + mfmsr r4 + stw r4,SL_MSR(r11) + mfspr r4,SPRN_TCR + stw r4,SL_TCR(r11) + + /* Get a stable timebase and save it */ +1: mfspr r4,SPRN_TBRU + stw r4,SL_TBU(r11) + mfspr r5,SPRN_TBRL + stw r5,SL_TBL(r11) + mfspr r3,SPRN_TBRU + cmpw r3,r4 + bne 1b + + /* Save SPRGs */ + mfspr r4,SPRN_SPRG0 + stw r4,SL_SPRG0(r11) + mfspr r4,SPRN_SPRG1 + stw r4,SL_SPRG1(r11) + mfspr r4,SPRN_SPRG2 + stw r4,SL_SPRG2(r11) + mfspr r4,SPRN_SPRG3 + stw r4,SL_SPRG3(r11) + mfspr r4,SPRN_SPRG4 + stw r4,SL_SPRG4(r11) + mfspr r4,SPRN_SPRG5 + stw r4,SL_SPRG5(r11) + mfspr r4,SPRN_SPRG6 + stw r4,SL_SPRG6(r11) + mfspr r4,SPRN_SPRG7 + stw r4,SL_SPRG7(r11) + + /* Call the low level suspend stuff (we should probably have made + * a stackframe... + */ + bl swsusp_save + + /* Restore LR from the save area */ + lis r11,swsusp_save_area@h + ori r11,r11,swsusp_save_area@l + lwz r0,SL_LR(r11) + mtlr r0 + + blr + +_GLOBAL(swsusp_arch_resume) + sync + + /* Load ptr the list of pages to copy in r3 */ + lis r11,(restore_pblist)@h + ori r11,r11,restore_pblist@l + lwz r3,0(r11) + + /* Copy the pages. This is a very basic implementation, to + * be replaced by something more cache efficient */ +1: + li r0,256 + mtctr r0 + lwz r5,pbe_address(r3) /* source */ + lwz r6,pbe_orig_address(r3) /* destination */ +2: + lwz r8,0(r5) + lwz r9,4(r5) + lwz r10,8(r5) + lwz r11,12(r5) + addi r5,r5,16 + stw r8,0(r6) + stw r9,4(r6) + stw r10,8(r6) + stw r11,12(r6) + addi r6,r6,16 + bdnz 2b + lwz r3,pbe_next(r3) + cmpwi 0,r3,0 + bne 1b + + bl flush_dcache_L1 + bl flush_instruction_cache + + lis r11,swsusp_save_area@h + ori r11,r11,swsusp_save_area@l + + /* + * Mappings from virtual addresses to physical addresses may be + * different than they were prior to restoring hibernation state. + * Invalidate the TLB so that the boot CPU is using the new + * mappings. + */ + bl _tlbil_all + + lwz r4,SL_SPRG0(r11) + mtspr SPRN_SPRG0,r4 + lwz r4,SL_SPRG1(r11) + mtspr SPRN_SPRG1,r4 + lwz r4,SL_SPRG2(r11) + mtspr SPRN_SPRG2,r4 + lwz r4,SL_SPRG3(r11) + mtspr SPRN_SPRG3,r4 + lwz r4,SL_SPRG4(r11) + mtspr SPRN_SPRG4,r4 + lwz r4,SL_SPRG5(r11) + mtspr SPRN_SPRG5,r4 + lwz r4,SL_SPRG6(r11) + mtspr SPRN_SPRG6,r4 + lwz r4,SL_SPRG7(r11) + mtspr SPRN_SPRG7,r4 + + /* restore the MSR */ + lwz r3,SL_MSR(r11) + mtmsr r3 + + /* Restore TB */ + li r3,0 + mtspr SPRN_TBWL,r3 + lwz r3,SL_TBU(r11) + lwz r4,SL_TBL(r11) + mtspr SPRN_TBWU,r3 + mtspr SPRN_TBWL,r4 + + /* Restore TCR and clear any pending bits in TSR. */ + lwz r4,SL_TCR(r11) + mtspr SPRN_TCR,r4 + lis r4, (TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS)@h + mtspr SPRN_TSR,r4 + + /* Kick decrementer */ + li r0,1 + mtdec r0 + + /* Restore the callee-saved registers and return */ + lwz r0,SL_CR(r11) + mtcr r0 + lwz r2,SL_R2(r11) + lmw r12,SL_R12(r11) + lwz r1,SL_SP(r11) + lwz r0,SL_LR(r11) + mtlr r0 + + li r3,0 + blr diff --git a/arch/powerpc/kernel/swsusp_asm64.S b/arch/powerpc/kernel/swsusp_asm64.S new file mode 100644 index 000000000..f645652c2 --- /dev/null +++ b/arch/powerpc/kernel/swsusp_asm64.S @@ -0,0 +1,266 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * PowerPC 64-bit swsusp implementation + * + * Copyright 2006 Johannes Berg <johannes@sipsolutions.net> + */ + +#include <linux/threads.h> +#include <asm/processor.h> +#include <asm/page.h> +#include <asm/cputable.h> +#include <asm/thread_info.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/feature-fixups.h> + +/* + * Structure for storing CPU registers on the save area. + */ +#define SL_r1 0x00 /* stack pointer */ +#define SL_PC 0x08 +#define SL_MSR 0x10 +#define SL_SDR1 0x18 +#define SL_XER 0x20 +#define SL_TB 0x40 +#define SL_r2 0x48 +#define SL_CR 0x50 +#define SL_LR 0x58 +#define SL_r12 0x60 +#define SL_r13 0x68 +#define SL_r14 0x70 +#define SL_r15 0x78 +#define SL_r16 0x80 +#define SL_r17 0x88 +#define SL_r18 0x90 +#define SL_r19 0x98 +#define SL_r20 0xa0 +#define SL_r21 0xa8 +#define SL_r22 0xb0 +#define SL_r23 0xb8 +#define SL_r24 0xc0 +#define SL_r25 0xc8 +#define SL_r26 0xd0 +#define SL_r27 0xd8 +#define SL_r28 0xe0 +#define SL_r29 0xe8 +#define SL_r30 0xf0 +#define SL_r31 0xf8 +#define SL_SPRG1 0x100 +#define SL_TCR 0x108 +#define SL_SIZE SL_TCR+8 + +/* these macros rely on the save area being + * pointed to by r11 */ + +#define SAVE_SPR(register) \ + mfspr r0, SPRN_##register ;\ + std r0, SL_##register(r11) +#define RESTORE_SPR(register) \ + ld r0, SL_##register(r11) ;\ + mtspr SPRN_##register, r0 +#define SAVE_SPECIAL(special) \ + mf##special r0 ;\ + std r0, SL_##special(r11) +#define RESTORE_SPECIAL(special) \ + ld r0, SL_##special(r11) ;\ + mt##special r0 +#define SAVE_REGISTER(reg) \ + std reg, SL_##reg(r11) +#define RESTORE_REGISTER(reg) \ + ld reg, SL_##reg(r11) + +/* space for storing cpu state */ + .section .data + .align 5 +swsusp_save_area: + .space SL_SIZE + + .section .text + .align 5 +_GLOBAL(swsusp_arch_suspend) + LOAD_REG_ADDR(r11, swsusp_save_area) + SAVE_SPECIAL(LR) + SAVE_REGISTER(r1) + SAVE_SPECIAL(CR) + SAVE_SPECIAL(TB) + SAVE_REGISTER(r2) + SAVE_REGISTER(r12) + SAVE_REGISTER(r13) + SAVE_REGISTER(r14) + SAVE_REGISTER(r15) + SAVE_REGISTER(r16) + SAVE_REGISTER(r17) + SAVE_REGISTER(r18) + SAVE_REGISTER(r19) + SAVE_REGISTER(r20) + SAVE_REGISTER(r21) + SAVE_REGISTER(r22) + SAVE_REGISTER(r23) + SAVE_REGISTER(r24) + SAVE_REGISTER(r25) + SAVE_REGISTER(r26) + SAVE_REGISTER(r27) + SAVE_REGISTER(r28) + SAVE_REGISTER(r29) + SAVE_REGISTER(r30) + SAVE_REGISTER(r31) + SAVE_SPECIAL(MSR) + SAVE_SPECIAL(XER) +#ifdef CONFIG_PPC_BOOK3S_64 +BEGIN_FW_FTR_SECTION + SAVE_SPECIAL(SDR1) +END_FW_FTR_SECTION_IFCLR(FW_FEATURE_LPAR) +#else + SAVE_SPR(TCR) + + /* Save SPRG1, SPRG1 be used save paca */ + SAVE_SPR(SPRG1) +#endif + + /* we push the stack up 128 bytes but don't store the + * stack pointer on the stack like a real stackframe */ + addi r1,r1,-128 + + bl swsusp_save + + /* restore LR */ + LOAD_REG_ADDR(r11, swsusp_save_area) + RESTORE_SPECIAL(LR) + addi r1,r1,128 + + blr + +/* Resume code */ +_GLOBAL(swsusp_arch_resume) + /* Stop pending alitvec streams and memory accesses */ +BEGIN_FTR_SECTION + PPC_DSSALL +END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) + sync + + LOAD_REG_ADDR(r11, restore_pblist) + ld r12,0(r12) + + cmpdi r12,0 + beq- nothing_to_copy + li r15,PAGE_SIZE>>3 +copyloop: + ld r13,pbe_address(r12) + ld r14,pbe_orig_address(r12) + + mtctr r15 + li r10,0 +copy_page_loop: + ldx r0,r10,r13 + stdx r0,r10,r14 + addi r10,r10,8 + bdnz copy_page_loop + + ld r12,pbe_next(r12) + cmpdi r12,0 + bne+ copyloop +nothing_to_copy: + +#ifdef CONFIG_PPC_BOOK3S_64 + /* flush caches */ + lis r3, 0x10 + mtctr r3 + li r3, 0 + ori r3, r3, CONFIG_KERNEL_START>>48 + li r0, 48 + sld r3, r3, r0 + li r0, 0 +1: + dcbf 0,r3 + addi r3,r3,0x20 + bdnz 1b + + sync + + tlbia +#endif + + LOAD_REG_ADDR(r11, swsusp_save_area) + + RESTORE_SPECIAL(CR) + + /* restore timebase */ + /* load saved tb */ + ld r1, SL_TB(r11) + /* get upper 32 bits of it */ + srdi r2, r1, 32 + /* clear tb lower to avoid wrap */ + li r0, 0 + mttbl r0 + /* set tb upper */ + mttbu r2 + /* set tb lower */ + mttbl r1 + + /* restore registers */ + RESTORE_REGISTER(r1) + RESTORE_REGISTER(r2) + RESTORE_REGISTER(r12) + RESTORE_REGISTER(r13) + RESTORE_REGISTER(r14) + RESTORE_REGISTER(r15) + RESTORE_REGISTER(r16) + RESTORE_REGISTER(r17) + RESTORE_REGISTER(r18) + RESTORE_REGISTER(r19) + RESTORE_REGISTER(r20) + RESTORE_REGISTER(r21) + RESTORE_REGISTER(r22) + RESTORE_REGISTER(r23) + RESTORE_REGISTER(r24) + RESTORE_REGISTER(r25) + RESTORE_REGISTER(r26) + RESTORE_REGISTER(r27) + RESTORE_REGISTER(r28) + RESTORE_REGISTER(r29) + RESTORE_REGISTER(r30) + RESTORE_REGISTER(r31) + +#ifdef CONFIG_PPC_BOOK3S_64 + /* can't use RESTORE_SPECIAL(MSR) */ + ld r0, SL_MSR(r11) + mtmsrd r0, 0 +BEGIN_FW_FTR_SECTION + RESTORE_SPECIAL(SDR1) +END_FW_FTR_SECTION_IFCLR(FW_FEATURE_LPAR) +#else + /* Restore SPRG1, be used to save paca */ + ld r0, SL_SPRG1(r11) + mtsprg 1, r0 + + RESTORE_SPECIAL(MSR) + + /* Restore TCR and clear any pending bits in TSR. */ + RESTORE_SPR(TCR) + lis r0, (TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS)@h + mtspr SPRN_TSR, r0 + + /* Kick decrementer */ + li r0, 1 + mtdec r0 + + /* Invalidate all tlbs */ + bl _tlbil_all +#endif + RESTORE_SPECIAL(XER) + + sync + + addi r1,r1,-128 +#ifdef CONFIG_PPC_BOOK3S_64 + bl slb_flush_and_restore_bolted +#endif + bl do_after_copyback + addi r1,r1,128 + + LOAD_REG_ADDR(r11, swsusp_save_area) + RESTORE_SPECIAL(LR) + + li r3, 0 + blr diff --git a/arch/powerpc/kernel/sys_ppc32.c b/arch/powerpc/kernel/sys_ppc32.c new file mode 100644 index 000000000..d451a8229 --- /dev/null +++ b/arch/powerpc/kernel/sys_ppc32.c @@ -0,0 +1,135 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * sys_ppc32.c: 32-bit system calls with complex calling conventions. + * + * Copyright (C) 2001 IBM + * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) + * + * 32-bit system calls with 64-bit arguments pass those in register pairs. + * This must be specially dealt with on 64-bit kernels. The compat_arg_u64_dual + * in generic compat syscalls is not always usable because the register + * pairing is constrained depending on preceding arguments. + * + * An analogous problem exists on 32-bit kernels with ARCH_HAS_SYSCALL_WRAPPER, + * the defined system call functions take the pt_regs as an argument, and there + * is a mapping macro which maps registers to arguments + * (SC_POWERPC_REGS_TO_ARGS) which also does not deal with these 64-bit + * arguments. + * + * This file contains these system calls. + */ + +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/fs.h> +#include <linux/mm.h> +#include <linux/file.h> +#include <linux/signal.h> +#include <linux/resource.h> +#include <linux/times.h> +#include <linux/smp.h> +#include <linux/sem.h> +#include <linux/msg.h> +#include <linux/shm.h> +#include <linux/poll.h> +#include <linux/personality.h> +#include <linux/stat.h> +#include <linux/in.h> +#include <linux/syscalls.h> +#include <linux/unistd.h> +#include <linux/sysctl.h> +#include <linux/binfmts.h> +#include <linux/security.h> +#include <linux/compat.h> +#include <linux/ptrace.h> +#include <linux/elf.h> +#include <linux/ipc.h> +#include <linux/slab.h> + +#include <asm/ptrace.h> +#include <asm/types.h> +#include <linux/uaccess.h> +#include <asm/unistd.h> +#include <asm/time.h> +#include <asm/mmu_context.h> +#include <asm/ppc-pci.h> +#include <asm/syscalls.h> +#include <asm/switch_to.h> + +#ifdef CONFIG_PPC32 +#define PPC32_SYSCALL_DEFINE4 SYSCALL_DEFINE4 +#define PPC32_SYSCALL_DEFINE5 SYSCALL_DEFINE5 +#define PPC32_SYSCALL_DEFINE6 SYSCALL_DEFINE6 +#else +#define PPC32_SYSCALL_DEFINE4 COMPAT_SYSCALL_DEFINE4 +#define PPC32_SYSCALL_DEFINE5 COMPAT_SYSCALL_DEFINE5 +#define PPC32_SYSCALL_DEFINE6 COMPAT_SYSCALL_DEFINE6 +#endif + +PPC32_SYSCALL_DEFINE6(ppc_pread64, + unsigned int, fd, + char __user *, ubuf, compat_size_t, count, + u32, reg6, u32, pos1, u32, pos2) +{ + return ksys_pread64(fd, ubuf, count, merge_64(pos1, pos2)); +} + +PPC32_SYSCALL_DEFINE6(ppc_pwrite64, + unsigned int, fd, + const char __user *, ubuf, compat_size_t, count, + u32, reg6, u32, pos1, u32, pos2) +{ + return ksys_pwrite64(fd, ubuf, count, merge_64(pos1, pos2)); +} + +PPC32_SYSCALL_DEFINE5(ppc_readahead, + int, fd, u32, r4, + u32, offset1, u32, offset2, u32, count) +{ + return ksys_readahead(fd, merge_64(offset1, offset2), count); +} + +PPC32_SYSCALL_DEFINE4(ppc_truncate64, + const char __user *, path, u32, reg4, + unsigned long, len1, unsigned long, len2) +{ + return ksys_truncate(path, merge_64(len1, len2)); +} + +PPC32_SYSCALL_DEFINE4(ppc_ftruncate64, + unsigned int, fd, u32, reg4, + unsigned long, len1, unsigned long, len2) +{ + return ksys_ftruncate(fd, merge_64(len1, len2)); +} + +PPC32_SYSCALL_DEFINE6(ppc32_fadvise64, + int, fd, u32, unused, u32, offset1, u32, offset2, + size_t, len, int, advice) +{ + return ksys_fadvise64_64(fd, merge_64(offset1, offset2), len, + advice); +} + +PPC32_SYSCALL_DEFINE6(ppc_sync_file_range2, + int, fd, unsigned int, flags, + unsigned int, offset1, unsigned int, offset2, + unsigned int, nbytes1, unsigned int, nbytes2) +{ + loff_t offset = merge_64(offset1, offset2); + loff_t nbytes = merge_64(nbytes1, nbytes2); + + return ksys_sync_file_range(fd, offset, nbytes, flags); +} + +#ifdef CONFIG_PPC32 +SYSCALL_DEFINE6(ppc_fallocate, + int, fd, int, mode, + u32, offset1, u32, offset2, u32, len1, u32, len2) +{ + return ksys_fallocate(fd, mode, + merge_64(offset1, offset2), + merge_64(len1, len2)); +} +#endif diff --git a/arch/powerpc/kernel/syscall.c b/arch/powerpc/kernel/syscall.c new file mode 100644 index 000000000..18b9d3253 --- /dev/null +++ b/arch/powerpc/kernel/syscall.c @@ -0,0 +1,189 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <linux/compat.h> +#include <linux/context_tracking.h> +#include <linux/randomize_kstack.h> + +#include <asm/interrupt.h> +#include <asm/kup.h> +#include <asm/syscall.h> +#include <asm/time.h> +#include <asm/tm.h> +#include <asm/unistd.h> + + +/* Has to run notrace because it is entered not completely "reconciled" */ +notrace long system_call_exception(struct pt_regs *regs, unsigned long r0) +{ + long ret; + syscall_fn f; + + kuap_lock(); + + add_random_kstack_offset(); + + if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) + BUG_ON(irq_soft_mask_return() != IRQS_ALL_DISABLED); + + trace_hardirqs_off(); /* finish reconciling */ + + CT_WARN_ON(ct_state() == CONTEXT_KERNEL); + user_exit_irqoff(); + + BUG_ON(regs_is_unrecoverable(regs)); + BUG_ON(!(regs->msr & MSR_PR)); + BUG_ON(arch_irq_disabled_regs(regs)); + +#ifdef CONFIG_PPC_PKEY + if (mmu_has_feature(MMU_FTR_PKEY)) { + unsigned long amr, iamr; + bool flush_needed = false; + /* + * When entering from userspace we mostly have the AMR/IAMR + * different from kernel default values. Hence don't compare. + */ + amr = mfspr(SPRN_AMR); + iamr = mfspr(SPRN_IAMR); + regs->amr = amr; + regs->iamr = iamr; + if (mmu_has_feature(MMU_FTR_BOOK3S_KUAP)) { + mtspr(SPRN_AMR, AMR_KUAP_BLOCKED); + flush_needed = true; + } + if (mmu_has_feature(MMU_FTR_BOOK3S_KUEP)) { + mtspr(SPRN_IAMR, AMR_KUEP_BLOCKED); + flush_needed = true; + } + if (flush_needed) + isync(); + } else +#endif + kuap_assert_locked(); + + booke_restore_dbcr0(); + + account_cpu_user_entry(); + + account_stolen_time(); + + /* + * This is not required for the syscall exit path, but makes the + * stack frame look nicer. If this was initialised in the first stack + * frame, or if the unwinder was taught the first stack frame always + * returns to user with IRQS_ENABLED, this store could be avoided! + */ + irq_soft_mask_regs_set_state(regs, IRQS_ENABLED); + + /* + * If system call is called with TM active, set _TIF_RESTOREALL to + * prevent RFSCV being used to return to userspace, because POWER9 + * TM implementation has problems with this instruction returning to + * transactional state. Final register values are not relevant because + * the transaction will be aborted upon return anyway. Or in the case + * of unsupported_scv SIGILL fault, the return state does not much + * matter because it's an edge case. + */ + if (IS_ENABLED(CONFIG_PPC_TRANSACTIONAL_MEM) && + unlikely(MSR_TM_TRANSACTIONAL(regs->msr))) + set_bits(_TIF_RESTOREALL, ¤t_thread_info()->flags); + + /* + * If the system call was made with a transaction active, doom it and + * return without performing the system call. Unless it was an + * unsupported scv vector, in which case it's treated like an illegal + * instruction. + */ +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + if (unlikely(MSR_TM_TRANSACTIONAL(regs->msr)) && + !trap_is_unsupported_scv(regs)) { + /* Enable TM in the kernel, and disable EE (for scv) */ + hard_irq_disable(); + mtmsr(mfmsr() | MSR_TM); + + /* tabort, this dooms the transaction, nothing else */ + asm volatile(".long 0x7c00071d | ((%0) << 16)" + :: "r"(TM_CAUSE_SYSCALL|TM_CAUSE_PERSISTENT)); + + /* + * Userspace will never see the return value. Execution will + * resume after the tbegin. of the aborted transaction with the + * checkpointed register state. A context switch could occur + * or signal delivered to the process before resuming the + * doomed transaction context, but that should all be handled + * as expected. + */ + return -ENOSYS; + } +#endif // CONFIG_PPC_TRANSACTIONAL_MEM + + local_irq_enable(); + + if (unlikely(read_thread_flags() & _TIF_SYSCALL_DOTRACE)) { + if (unlikely(trap_is_unsupported_scv(regs))) { + /* Unsupported scv vector */ + _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); + return regs->gpr[3]; + } + /* + * We use the return value of do_syscall_trace_enter() as the + * syscall number. If the syscall was rejected for any reason + * do_syscall_trace_enter() returns an invalid syscall number + * and the test against NR_syscalls will fail and the return + * value to be used is in regs->gpr[3]. + */ + r0 = do_syscall_trace_enter(regs); + if (unlikely(r0 >= NR_syscalls)) + return regs->gpr[3]; + + } else if (unlikely(r0 >= NR_syscalls)) { + if (unlikely(trap_is_unsupported_scv(regs))) { + /* Unsupported scv vector */ + _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); + return regs->gpr[3]; + } + return -ENOSYS; + } + + /* May be faster to do array_index_nospec? */ + barrier_nospec(); + +#ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER + // No COMPAT if we have SYSCALL_WRAPPER, see Kconfig + f = (void *)sys_call_table[r0]; + ret = f(regs); +#else + if (unlikely(is_compat_task())) { + unsigned long r3, r4, r5, r6, r7, r8; + + f = (void *)compat_sys_call_table[r0]; + + r3 = regs->gpr[3] & 0x00000000ffffffffULL; + r4 = regs->gpr[4] & 0x00000000ffffffffULL; + r5 = regs->gpr[5] & 0x00000000ffffffffULL; + r6 = regs->gpr[6] & 0x00000000ffffffffULL; + r7 = regs->gpr[7] & 0x00000000ffffffffULL; + r8 = regs->gpr[8] & 0x00000000ffffffffULL; + + ret = f(r3, r4, r5, r6, r7, r8); + } else { + f = (void *)sys_call_table[r0]; + + ret = f(regs->gpr[3], regs->gpr[4], regs->gpr[5], + regs->gpr[6], regs->gpr[7], regs->gpr[8]); + } +#endif + + /* + * Ultimately, this value will get limited by KSTACK_OFFSET_MAX(), + * so the maximum stack offset is 1k bytes (10 bits). + * + * The actual entropy will be further reduced by the compiler when + * applying stack alignment constraints: the powerpc architecture + * may have two kinds of stack alignment (16-bytes and 8-bytes). + * + * So the resulting 6 or 7 bits of entropy is seen in SP[9:4] or SP[9:3]. + */ + choose_random_kstack_offset(mftb()); + + return ret; +} diff --git a/arch/powerpc/kernel/syscalls.c b/arch/powerpc/kernel/syscalls.c new file mode 100644 index 000000000..68ebb23a5 --- /dev/null +++ b/arch/powerpc/kernel/syscalls.c @@ -0,0 +1,127 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Implementation of various system calls for Linux/PowerPC + * + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * + * Derived from "arch/i386/kernel/sys_i386.c" + * Adapted from the i386 version by Gary Thomas + * Modified by Cort Dougan (cort@cs.nmt.edu) + * and Paul Mackerras (paulus@cs.anu.edu.au). + * + * This file contains various random system calls that + * have a non-standard calling sequence on the Linux/PPC + * platform. + */ + +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/syscalls.h> +#include <linux/mm.h> +#include <linux/fs.h> +#include <linux/smp.h> +#include <linux/sem.h> +#include <linux/msg.h> +#include <linux/shm.h> +#include <linux/stat.h> +#include <linux/mman.h> +#include <linux/sys.h> +#include <linux/ipc.h> +#include <linux/utsname.h> +#include <linux/file.h> +#include <linux/personality.h> + +#include <linux/uaccess.h> +#include <asm/syscalls.h> +#include <asm/time.h> +#include <asm/unistd.h> + +static long do_mmap2(unsigned long addr, size_t len, + unsigned long prot, unsigned long flags, + unsigned long fd, unsigned long off, int shift) +{ + if (!arch_validate_prot(prot, addr)) + return -EINVAL; + + if (!IS_ALIGNED(off, 1 << shift)) + return -EINVAL; + + return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> shift); +} + +SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len, + unsigned long, prot, unsigned long, flags, + unsigned long, fd, unsigned long, pgoff) +{ + return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12); +} + +#ifdef CONFIG_COMPAT +COMPAT_SYSCALL_DEFINE6(mmap2, + unsigned long, addr, size_t, len, + unsigned long, prot, unsigned long, flags, + unsigned long, fd, unsigned long, off_4k) +{ + return do_mmap2(addr, len, prot, flags, fd, off_4k, PAGE_SHIFT-12); +} +#endif + +SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len, + unsigned long, prot, unsigned long, flags, + unsigned long, fd, off_t, offset) +{ + return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT); +} + +#ifdef CONFIG_PPC64 +static long do_ppc64_personality(unsigned long personality) +{ + long ret; + + if (personality(current->personality) == PER_LINUX32 + && personality(personality) == PER_LINUX) + personality = (personality & ~PER_MASK) | PER_LINUX32; + ret = ksys_personality(personality); + if (personality(ret) == PER_LINUX32) + ret = (ret & ~PER_MASK) | PER_LINUX; + return ret; +} + +SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality) +{ + return do_ppc64_personality(personality); +} + +#ifdef CONFIG_COMPAT +COMPAT_SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality) +{ + return do_ppc64_personality(personality); +} +#endif /* CONFIG_COMPAT */ +#endif /* CONFIG_PPC64 */ + +SYSCALL_DEFINE6(ppc_fadvise64_64, + int, fd, int, advice, u32, offset_high, u32, offset_low, + u32, len_high, u32, len_low) +{ + return ksys_fadvise64_64(fd, merge_64(offset_high, offset_low), + merge_64(len_high, len_low), advice); +} + +SYSCALL_DEFINE0(switch_endian) +{ + struct thread_info *ti; + + regs_set_return_msr(current->thread.regs, + current->thread.regs->msr ^ MSR_LE); + + /* + * Set TIF_RESTOREALL so that r3 isn't clobbered on return to + * userspace. That also has the effect of restoring the non-volatile + * GPRs, so we saved them on the way in here. + */ + ti = current_thread_info(); + ti->flags |= _TIF_RESTOREALL; + + return 0; +} diff --git a/arch/powerpc/kernel/syscalls/Makefile b/arch/powerpc/kernel/syscalls/Makefile new file mode 100644 index 000000000..9d7bd8151 --- /dev/null +++ b/arch/powerpc/kernel/syscalls/Makefile @@ -0,0 +1,48 @@ +# SPDX-License-Identifier: GPL-2.0 +kapi := arch/$(SRCARCH)/include/generated/asm +uapi := arch/$(SRCARCH)/include/generated/uapi/asm + +$(shell mkdir -p $(uapi) $(kapi)) + +syscall := $(src)/syscall.tbl +syshdr := $(srctree)/scripts/syscallhdr.sh +systbl := $(srctree)/scripts/syscalltbl.sh + +quiet_cmd_syshdr = SYSHDR $@ + cmd_syshdr = $(CONFIG_SHELL) $(syshdr) --emit-nr --abis $(abis) $< $@ + +quiet_cmd_systbl = SYSTBL $@ + cmd_systbl = $(CONFIG_SHELL) $(systbl) --abis $(abis) $< $@ + +$(uapi)/unistd_32.h: abis := common,nospu,32 +$(uapi)/unistd_32.h: $(syscall) $(syshdr) FORCE + $(call if_changed,syshdr) + +$(uapi)/unistd_64.h: abis := common,nospu,64 +$(uapi)/unistd_64.h: $(syscall) $(syshdr) FORCE + $(call if_changed,syshdr) + +$(kapi)/syscall_table_32.h: abis := common,nospu,32 +$(kapi)/syscall_table_32.h: $(syscall) $(systbl) FORCE + $(call if_changed,systbl) + +$(kapi)/syscall_table_64.h: abis := common,nospu,64 +$(kapi)/syscall_table_64.h: $(syscall) $(systbl) FORCE + $(call if_changed,systbl) + +$(kapi)/syscall_table_spu.h: abis := common,spu +$(kapi)/syscall_table_spu.h: $(syscall) $(systbl) FORCE + $(call if_changed,systbl) + +uapisyshdr-y += unistd_32.h unistd_64.h +kapisyshdr-y += syscall_table_32.h \ + syscall_table_64.h \ + syscall_table_spu.h + +uapisyshdr-y := $(addprefix $(uapi)/, $(uapisyshdr-y)) +kapisyshdr-y := $(addprefix $(kapi)/, $(kapisyshdr-y)) +targets += $(addprefix ../../../../, $(uapisyshdr-y) $(kapisyshdr-y)) + +PHONY += all +all: $(uapisyshdr-y) $(kapisyshdr-y) + @: diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl new file mode 100644 index 000000000..a0be12747 --- /dev/null +++ b/arch/powerpc/kernel/syscalls/syscall.tbl @@ -0,0 +1,539 @@ +# SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note +# +# system call numbers and entry vectors for powerpc +# +# The format is: +# <number> <abi> <name> <entry point> <compat entry point> +# +# The <abi> can be common, spu, nospu, 64, or 32 for this file. +# +0 nospu restart_syscall sys_restart_syscall +1 nospu exit sys_exit +2 nospu fork sys_fork +3 common read sys_read +4 common write sys_write +5 common open sys_open compat_sys_open +6 common close sys_close +7 common waitpid sys_waitpid +8 common creat sys_creat +9 common link sys_link +10 common unlink sys_unlink +11 nospu execve sys_execve compat_sys_execve +12 common chdir sys_chdir +13 32 time sys_time32 +13 64 time sys_time +13 spu time sys_time +14 common mknod sys_mknod +15 common chmod sys_chmod +16 common lchown sys_lchown +17 common break sys_ni_syscall +18 32 oldstat sys_stat sys_ni_syscall +18 64 oldstat sys_ni_syscall +18 spu oldstat sys_ni_syscall +19 common lseek sys_lseek compat_sys_lseek +20 common getpid sys_getpid +21 nospu mount sys_mount +22 32 umount sys_oldumount +22 64 umount sys_ni_syscall +22 spu umount sys_ni_syscall +23 common setuid sys_setuid +24 common getuid sys_getuid +25 32 stime sys_stime32 +25 64 stime sys_stime +25 spu stime sys_stime +26 nospu ptrace sys_ptrace compat_sys_ptrace +27 common alarm sys_alarm +28 32 oldfstat sys_fstat sys_ni_syscall +28 64 oldfstat sys_ni_syscall +28 spu oldfstat sys_ni_syscall +29 nospu pause sys_pause +30 32 utime sys_utime32 +30 64 utime sys_utime +31 common stty sys_ni_syscall +32 common gtty sys_ni_syscall +33 common access sys_access +34 common nice sys_nice +35 common ftime sys_ni_syscall +36 common sync sys_sync +37 common kill sys_kill +38 common rename sys_rename +39 common mkdir sys_mkdir +40 common rmdir sys_rmdir +41 common dup sys_dup +42 common pipe sys_pipe +43 common times sys_times compat_sys_times +44 common prof sys_ni_syscall +45 common brk sys_brk +46 common setgid sys_setgid +47 common getgid sys_getgid +48 nospu signal sys_signal +49 common geteuid sys_geteuid +50 common getegid sys_getegid +51 nospu acct sys_acct +52 nospu umount2 sys_umount +53 common lock sys_ni_syscall +54 common ioctl sys_ioctl compat_sys_ioctl +55 common fcntl sys_fcntl compat_sys_fcntl +56 common mpx sys_ni_syscall +57 common setpgid sys_setpgid +58 common ulimit sys_ni_syscall +59 32 oldolduname sys_olduname +59 64 oldolduname sys_ni_syscall +59 spu oldolduname sys_ni_syscall +60 common umask sys_umask +61 common chroot sys_chroot +62 nospu ustat sys_ustat compat_sys_ustat +63 common dup2 sys_dup2 +64 common getppid sys_getppid +65 common getpgrp sys_getpgrp +66 common setsid sys_setsid +67 32 sigaction sys_sigaction compat_sys_sigaction +67 64 sigaction sys_ni_syscall +67 spu sigaction sys_ni_syscall +68 common sgetmask sys_sgetmask +69 common ssetmask sys_ssetmask +70 common setreuid sys_setreuid +71 common setregid sys_setregid +72 32 sigsuspend sys_sigsuspend +72 64 sigsuspend sys_ni_syscall +72 spu sigsuspend sys_ni_syscall +73 32 sigpending sys_sigpending compat_sys_sigpending +73 64 sigpending sys_ni_syscall +73 spu sigpending sys_ni_syscall +74 common sethostname sys_sethostname +75 common setrlimit sys_setrlimit compat_sys_setrlimit +76 32 getrlimit sys_old_getrlimit compat_sys_old_getrlimit +76 64 getrlimit sys_ni_syscall +76 spu getrlimit sys_ni_syscall +77 common getrusage sys_getrusage compat_sys_getrusage +78 common gettimeofday sys_gettimeofday compat_sys_gettimeofday +79 common settimeofday sys_settimeofday compat_sys_settimeofday +80 common getgroups sys_getgroups +81 common setgroups sys_setgroups +82 32 select sys_old_select compat_sys_old_select +82 64 select sys_ni_syscall +82 spu select sys_ni_syscall +83 common symlink sys_symlink +84 32 oldlstat sys_lstat sys_ni_syscall +84 64 oldlstat sys_ni_syscall +84 spu oldlstat sys_ni_syscall +85 common readlink sys_readlink +86 nospu uselib sys_uselib +87 nospu swapon sys_swapon +88 nospu reboot sys_reboot +89 32 readdir sys_old_readdir compat_sys_old_readdir +89 64 readdir sys_ni_syscall +89 spu readdir sys_ni_syscall +90 common mmap sys_mmap +91 common munmap sys_munmap +92 common truncate sys_truncate compat_sys_truncate +93 common ftruncate sys_ftruncate compat_sys_ftruncate +94 common fchmod sys_fchmod +95 common fchown sys_fchown +96 common getpriority sys_getpriority +97 common setpriority sys_setpriority +98 common profil sys_ni_syscall +99 nospu statfs sys_statfs compat_sys_statfs +100 nospu fstatfs sys_fstatfs compat_sys_fstatfs +101 common ioperm sys_ni_syscall +102 common socketcall sys_socketcall compat_sys_socketcall +103 common syslog sys_syslog +104 common setitimer sys_setitimer compat_sys_setitimer +105 common getitimer sys_getitimer compat_sys_getitimer +106 common stat sys_newstat compat_sys_newstat +107 common lstat sys_newlstat compat_sys_newlstat +108 common fstat sys_newfstat compat_sys_newfstat +109 32 olduname sys_uname +109 64 olduname sys_ni_syscall +109 spu olduname sys_ni_syscall +110 common iopl sys_ni_syscall +111 common vhangup sys_vhangup +112 common idle sys_ni_syscall +113 common vm86 sys_ni_syscall +114 common wait4 sys_wait4 compat_sys_wait4 +115 nospu swapoff sys_swapoff +116 common sysinfo sys_sysinfo compat_sys_sysinfo +117 nospu ipc sys_ipc compat_sys_ipc +118 common fsync sys_fsync +119 32 sigreturn sys_sigreturn compat_sys_sigreturn +119 64 sigreturn sys_ni_syscall +119 spu sigreturn sys_ni_syscall +120 nospu clone sys_clone +121 common setdomainname sys_setdomainname +122 common uname sys_newuname +123 common modify_ldt sys_ni_syscall +124 32 adjtimex sys_adjtimex_time32 +124 64 adjtimex sys_adjtimex +124 spu adjtimex sys_adjtimex +125 common mprotect sys_mprotect +126 32 sigprocmask sys_sigprocmask compat_sys_sigprocmask +126 64 sigprocmask sys_ni_syscall +126 spu sigprocmask sys_ni_syscall +127 common create_module sys_ni_syscall +128 nospu init_module sys_init_module +129 nospu delete_module sys_delete_module +130 common get_kernel_syms sys_ni_syscall +131 nospu quotactl sys_quotactl +132 common getpgid sys_getpgid +133 common fchdir sys_fchdir +134 common bdflush sys_ni_syscall +135 common sysfs sys_sysfs +136 32 personality sys_personality compat_sys_ppc64_personality +136 64 personality sys_ppc64_personality +136 spu personality sys_ppc64_personality +137 common afs_syscall sys_ni_syscall +138 common setfsuid sys_setfsuid +139 common setfsgid sys_setfsgid +140 common _llseek sys_llseek +141 common getdents sys_getdents compat_sys_getdents +142 common _newselect sys_select compat_sys_select +143 common flock sys_flock +144 common msync sys_msync +145 common readv sys_readv +146 common writev sys_writev +147 common getsid sys_getsid +148 common fdatasync sys_fdatasync +149 nospu _sysctl sys_ni_syscall +150 common mlock sys_mlock +151 common munlock sys_munlock +152 common mlockall sys_mlockall +153 common munlockall sys_munlockall +154 common sched_setparam sys_sched_setparam +155 common sched_getparam sys_sched_getparam +156 common sched_setscheduler sys_sched_setscheduler +157 common sched_getscheduler sys_sched_getscheduler +158 common sched_yield sys_sched_yield +159 common sched_get_priority_max sys_sched_get_priority_max +160 common sched_get_priority_min sys_sched_get_priority_min +161 32 sched_rr_get_interval sys_sched_rr_get_interval_time32 +161 64 sched_rr_get_interval sys_sched_rr_get_interval +161 spu sched_rr_get_interval sys_sched_rr_get_interval +162 32 nanosleep sys_nanosleep_time32 +162 64 nanosleep sys_nanosleep +162 spu nanosleep sys_nanosleep +163 common mremap sys_mremap +164 common setresuid sys_setresuid +165 common getresuid sys_getresuid +166 common query_module sys_ni_syscall +167 common poll sys_poll +168 common nfsservctl sys_ni_syscall +169 common setresgid sys_setresgid +170 common getresgid sys_getresgid +171 common prctl sys_prctl +172 nospu rt_sigreturn sys_rt_sigreturn compat_sys_rt_sigreturn +173 nospu rt_sigaction sys_rt_sigaction compat_sys_rt_sigaction +174 nospu rt_sigprocmask sys_rt_sigprocmask compat_sys_rt_sigprocmask +175 nospu rt_sigpending sys_rt_sigpending compat_sys_rt_sigpending +176 32 rt_sigtimedwait sys_rt_sigtimedwait_time32 compat_sys_rt_sigtimedwait_time32 +176 64 rt_sigtimedwait sys_rt_sigtimedwait +177 nospu rt_sigqueueinfo sys_rt_sigqueueinfo compat_sys_rt_sigqueueinfo +178 nospu rt_sigsuspend sys_rt_sigsuspend compat_sys_rt_sigsuspend +179 32 pread64 sys_ppc_pread64 compat_sys_ppc_pread64 +179 64 pread64 sys_pread64 +180 32 pwrite64 sys_ppc_pwrite64 compat_sys_ppc_pwrite64 +180 64 pwrite64 sys_pwrite64 +181 common chown sys_chown +182 common getcwd sys_getcwd +183 common capget sys_capget +184 common capset sys_capset +185 nospu sigaltstack sys_sigaltstack compat_sys_sigaltstack +186 32 sendfile sys_sendfile compat_sys_sendfile +186 64 sendfile sys_sendfile64 +186 spu sendfile sys_sendfile64 +187 common getpmsg sys_ni_syscall +188 common putpmsg sys_ni_syscall +189 nospu vfork sys_vfork +190 common ugetrlimit sys_getrlimit compat_sys_getrlimit +191 32 readahead sys_ppc_readahead compat_sys_ppc_readahead +191 64 readahead sys_readahead +192 32 mmap2 sys_mmap2 compat_sys_mmap2 +193 32 truncate64 sys_ppc_truncate64 compat_sys_ppc_truncate64 +194 32 ftruncate64 sys_ppc_ftruncate64 compat_sys_ppc_ftruncate64 +195 32 stat64 sys_stat64 +196 32 lstat64 sys_lstat64 +197 32 fstat64 sys_fstat64 +198 nospu pciconfig_read sys_pciconfig_read +199 nospu pciconfig_write sys_pciconfig_write +200 nospu pciconfig_iobase sys_pciconfig_iobase +201 common multiplexer sys_ni_syscall +202 common getdents64 sys_getdents64 +203 common pivot_root sys_pivot_root +204 32 fcntl64 sys_fcntl64 compat_sys_fcntl64 +205 common madvise sys_madvise +206 common mincore sys_mincore +207 common gettid sys_gettid +208 common tkill sys_tkill +209 common setxattr sys_setxattr +210 common lsetxattr sys_lsetxattr +211 common fsetxattr sys_fsetxattr +212 common getxattr sys_getxattr +213 common lgetxattr sys_lgetxattr +214 common fgetxattr sys_fgetxattr +215 common listxattr sys_listxattr +216 common llistxattr sys_llistxattr +217 common flistxattr sys_flistxattr +218 common removexattr sys_removexattr +219 common lremovexattr sys_lremovexattr +220 common fremovexattr sys_fremovexattr +221 32 futex sys_futex_time32 +221 64 futex sys_futex +221 spu futex sys_futex +222 common sched_setaffinity sys_sched_setaffinity compat_sys_sched_setaffinity +223 common sched_getaffinity sys_sched_getaffinity compat_sys_sched_getaffinity +# 224 unused +225 common tuxcall sys_ni_syscall +226 32 sendfile64 sys_sendfile64 compat_sys_sendfile64 +227 common io_setup sys_io_setup compat_sys_io_setup +228 common io_destroy sys_io_destroy +229 32 io_getevents sys_io_getevents_time32 +229 64 io_getevents sys_io_getevents +229 spu io_getevents sys_io_getevents +230 common io_submit sys_io_submit compat_sys_io_submit +231 common io_cancel sys_io_cancel +232 nospu set_tid_address sys_set_tid_address +233 32 fadvise64 sys_ppc32_fadvise64 compat_sys_ppc32_fadvise64 +233 64 fadvise64 sys_fadvise64 +234 nospu exit_group sys_exit_group +235 nospu lookup_dcookie sys_lookup_dcookie compat_sys_lookup_dcookie +236 common epoll_create sys_epoll_create +237 common epoll_ctl sys_epoll_ctl +238 common epoll_wait sys_epoll_wait +239 common remap_file_pages sys_remap_file_pages +240 common timer_create sys_timer_create compat_sys_timer_create +241 32 timer_settime sys_timer_settime32 +241 64 timer_settime sys_timer_settime +241 spu timer_settime sys_timer_settime +242 32 timer_gettime sys_timer_gettime32 +242 64 timer_gettime sys_timer_gettime +242 spu timer_gettime sys_timer_gettime +243 common timer_getoverrun sys_timer_getoverrun +244 common timer_delete sys_timer_delete +245 32 clock_settime sys_clock_settime32 +245 64 clock_settime sys_clock_settime +245 spu clock_settime sys_clock_settime +246 32 clock_gettime sys_clock_gettime32 +246 64 clock_gettime sys_clock_gettime +246 spu clock_gettime sys_clock_gettime +247 32 clock_getres sys_clock_getres_time32 +247 64 clock_getres sys_clock_getres +247 spu clock_getres sys_clock_getres +248 32 clock_nanosleep sys_clock_nanosleep_time32 +248 64 clock_nanosleep sys_clock_nanosleep +248 spu clock_nanosleep sys_clock_nanosleep +249 nospu swapcontext sys_swapcontext compat_sys_swapcontext +250 common tgkill sys_tgkill +251 32 utimes sys_utimes_time32 +251 64 utimes sys_utimes +251 spu utimes sys_utimes +252 common statfs64 sys_statfs64 compat_sys_statfs64 +253 common fstatfs64 sys_fstatfs64 compat_sys_fstatfs64 +254 32 fadvise64_64 sys_ppc_fadvise64_64 +254 spu fadvise64_64 sys_ni_syscall +255 common rtas sys_rtas +256 32 sys_debug_setcontext sys_debug_setcontext sys_ni_syscall +256 64 sys_debug_setcontext sys_ni_syscall +256 spu sys_debug_setcontext sys_ni_syscall +# 257 reserved for vserver +258 nospu migrate_pages sys_migrate_pages +259 nospu mbind sys_mbind +260 nospu get_mempolicy sys_get_mempolicy +261 nospu set_mempolicy sys_set_mempolicy +262 nospu mq_open sys_mq_open compat_sys_mq_open +263 nospu mq_unlink sys_mq_unlink +264 32 mq_timedsend sys_mq_timedsend_time32 +264 64 mq_timedsend sys_mq_timedsend +265 32 mq_timedreceive sys_mq_timedreceive_time32 +265 64 mq_timedreceive sys_mq_timedreceive +266 nospu mq_notify sys_mq_notify compat_sys_mq_notify +267 nospu mq_getsetattr sys_mq_getsetattr compat_sys_mq_getsetattr +268 nospu kexec_load sys_kexec_load compat_sys_kexec_load +269 nospu add_key sys_add_key +270 nospu request_key sys_request_key +271 nospu keyctl sys_keyctl compat_sys_keyctl +272 nospu waitid sys_waitid compat_sys_waitid +273 nospu ioprio_set sys_ioprio_set +274 nospu ioprio_get sys_ioprio_get +275 nospu inotify_init sys_inotify_init +276 nospu inotify_add_watch sys_inotify_add_watch +277 nospu inotify_rm_watch sys_inotify_rm_watch +278 nospu spu_run sys_spu_run +279 nospu spu_create sys_spu_create +280 32 pselect6 sys_pselect6_time32 compat_sys_pselect6_time32 +280 64 pselect6 sys_pselect6 +281 32 ppoll sys_ppoll_time32 compat_sys_ppoll_time32 +281 64 ppoll sys_ppoll +282 common unshare sys_unshare +283 common splice sys_splice +284 common tee sys_tee +285 common vmsplice sys_vmsplice +286 common openat sys_openat compat_sys_openat +287 common mkdirat sys_mkdirat +288 common mknodat sys_mknodat +289 common fchownat sys_fchownat +290 32 futimesat sys_futimesat_time32 +290 64 futimesat sys_futimesat +290 spu utimesat sys_futimesat +291 32 fstatat64 sys_fstatat64 +291 64 newfstatat sys_newfstatat +291 spu newfstatat sys_newfstatat +292 common unlinkat sys_unlinkat +293 common renameat sys_renameat +294 common linkat sys_linkat +295 common symlinkat sys_symlinkat +296 common readlinkat sys_readlinkat +297 common fchmodat sys_fchmodat +298 common faccessat sys_faccessat +299 common get_robust_list sys_get_robust_list compat_sys_get_robust_list +300 common set_robust_list sys_set_robust_list compat_sys_set_robust_list +301 common move_pages sys_move_pages +302 common getcpu sys_getcpu +303 nospu epoll_pwait sys_epoll_pwait compat_sys_epoll_pwait +304 32 utimensat sys_utimensat_time32 +304 64 utimensat sys_utimensat +304 spu utimensat sys_utimensat +305 common signalfd sys_signalfd compat_sys_signalfd +306 common timerfd_create sys_timerfd_create +307 common eventfd sys_eventfd +308 32 sync_file_range2 sys_ppc_sync_file_range2 compat_sys_ppc_sync_file_range2 +308 64 sync_file_range2 sys_sync_file_range2 +308 spu sync_file_range2 sys_sync_file_range2 +309 32 fallocate sys_ppc_fallocate compat_sys_fallocate +309 64 fallocate sys_fallocate +310 nospu subpage_prot sys_subpage_prot +311 32 timerfd_settime sys_timerfd_settime32 +311 64 timerfd_settime sys_timerfd_settime +311 spu timerfd_settime sys_timerfd_settime +312 32 timerfd_gettime sys_timerfd_gettime32 +312 64 timerfd_gettime sys_timerfd_gettime +312 spu timerfd_gettime sys_timerfd_gettime +313 common signalfd4 sys_signalfd4 compat_sys_signalfd4 +314 common eventfd2 sys_eventfd2 +315 common epoll_create1 sys_epoll_create1 +316 common dup3 sys_dup3 +317 common pipe2 sys_pipe2 +318 nospu inotify_init1 sys_inotify_init1 +319 common perf_event_open sys_perf_event_open +320 common preadv sys_preadv compat_sys_preadv +321 common pwritev sys_pwritev compat_sys_pwritev +322 nospu rt_tgsigqueueinfo sys_rt_tgsigqueueinfo compat_sys_rt_tgsigqueueinfo +323 nospu fanotify_init sys_fanotify_init +324 nospu fanotify_mark sys_fanotify_mark compat_sys_fanotify_mark +325 common prlimit64 sys_prlimit64 +326 common socket sys_socket +327 common bind sys_bind +328 common connect sys_connect +329 common listen sys_listen +330 common accept sys_accept +331 common getsockname sys_getsockname +332 common getpeername sys_getpeername +333 common socketpair sys_socketpair +334 common send sys_send +335 common sendto sys_sendto +336 common recv sys_recv compat_sys_recv +337 common recvfrom sys_recvfrom compat_sys_recvfrom +338 common shutdown sys_shutdown +339 common setsockopt sys_setsockopt sys_setsockopt +340 common getsockopt sys_getsockopt sys_getsockopt +341 common sendmsg sys_sendmsg compat_sys_sendmsg +342 common recvmsg sys_recvmsg compat_sys_recvmsg +343 32 recvmmsg sys_recvmmsg_time32 compat_sys_recvmmsg_time32 +343 64 recvmmsg sys_recvmmsg +343 spu recvmmsg sys_recvmmsg +344 common accept4 sys_accept4 +345 common name_to_handle_at sys_name_to_handle_at +346 common open_by_handle_at sys_open_by_handle_at compat_sys_open_by_handle_at +347 32 clock_adjtime sys_clock_adjtime32 +347 64 clock_adjtime sys_clock_adjtime +347 spu clock_adjtime sys_clock_adjtime +348 common syncfs sys_syncfs +349 common sendmmsg sys_sendmmsg compat_sys_sendmmsg +350 common setns sys_setns +351 nospu process_vm_readv sys_process_vm_readv +352 nospu process_vm_writev sys_process_vm_writev +353 nospu finit_module sys_finit_module +354 nospu kcmp sys_kcmp +355 common sched_setattr sys_sched_setattr +356 common sched_getattr sys_sched_getattr +357 common renameat2 sys_renameat2 +358 common seccomp sys_seccomp +359 common getrandom sys_getrandom +360 common memfd_create sys_memfd_create +361 common bpf sys_bpf +362 nospu execveat sys_execveat compat_sys_execveat +363 32 switch_endian sys_ni_syscall +363 64 switch_endian sys_switch_endian +363 spu switch_endian sys_ni_syscall +364 common userfaultfd sys_userfaultfd +365 common membarrier sys_membarrier +# 366-377 originally left for IPC, now unused +378 nospu mlock2 sys_mlock2 +379 nospu copy_file_range sys_copy_file_range +380 common preadv2 sys_preadv2 compat_sys_preadv2 +381 common pwritev2 sys_pwritev2 compat_sys_pwritev2 +382 nospu kexec_file_load sys_kexec_file_load +383 nospu statx sys_statx +384 nospu pkey_alloc sys_pkey_alloc +385 nospu pkey_free sys_pkey_free +386 nospu pkey_mprotect sys_pkey_mprotect +387 nospu rseq sys_rseq +388 32 io_pgetevents sys_io_pgetevents_time32 compat_sys_io_pgetevents +388 64 io_pgetevents sys_io_pgetevents +# room for arch specific syscalls +392 64 semtimedop sys_semtimedop +393 common semget sys_semget +394 common semctl sys_semctl compat_sys_semctl +395 common shmget sys_shmget +396 common shmctl sys_shmctl compat_sys_shmctl +397 common shmat sys_shmat compat_sys_shmat +398 common shmdt sys_shmdt +399 common msgget sys_msgget +400 common msgsnd sys_msgsnd compat_sys_msgsnd +401 common msgrcv sys_msgrcv compat_sys_msgrcv +402 common msgctl sys_msgctl compat_sys_msgctl +403 32 clock_gettime64 sys_clock_gettime sys_clock_gettime +404 32 clock_settime64 sys_clock_settime sys_clock_settime +405 32 clock_adjtime64 sys_clock_adjtime sys_clock_adjtime +406 32 clock_getres_time64 sys_clock_getres sys_clock_getres +407 32 clock_nanosleep_time64 sys_clock_nanosleep sys_clock_nanosleep +408 32 timer_gettime64 sys_timer_gettime sys_timer_gettime +409 32 timer_settime64 sys_timer_settime sys_timer_settime +410 32 timerfd_gettime64 sys_timerfd_gettime sys_timerfd_gettime +411 32 timerfd_settime64 sys_timerfd_settime sys_timerfd_settime +412 32 utimensat_time64 sys_utimensat sys_utimensat +413 32 pselect6_time64 sys_pselect6 compat_sys_pselect6_time64 +414 32 ppoll_time64 sys_ppoll compat_sys_ppoll_time64 +416 32 io_pgetevents_time64 sys_io_pgetevents sys_io_pgetevents +417 32 recvmmsg_time64 sys_recvmmsg compat_sys_recvmmsg_time64 +418 32 mq_timedsend_time64 sys_mq_timedsend sys_mq_timedsend +419 32 mq_timedreceive_time64 sys_mq_timedreceive sys_mq_timedreceive +420 32 semtimedop_time64 sys_semtimedop sys_semtimedop +421 32 rt_sigtimedwait_time64 sys_rt_sigtimedwait compat_sys_rt_sigtimedwait_time64 +422 32 futex_time64 sys_futex sys_futex +423 32 sched_rr_get_interval_time64 sys_sched_rr_get_interval sys_sched_rr_get_interval +424 common pidfd_send_signal sys_pidfd_send_signal +425 common io_uring_setup sys_io_uring_setup +426 common io_uring_enter sys_io_uring_enter +427 common io_uring_register sys_io_uring_register +428 common open_tree sys_open_tree +429 common move_mount sys_move_mount +430 common fsopen sys_fsopen +431 common fsconfig sys_fsconfig +432 common fsmount sys_fsmount +433 common fspick sys_fspick +434 common pidfd_open sys_pidfd_open +435 nospu clone3 sys_clone3 +436 common close_range sys_close_range +437 common openat2 sys_openat2 +438 common pidfd_getfd sys_pidfd_getfd +439 common faccessat2 sys_faccessat2 +440 common process_madvise sys_process_madvise +441 common epoll_pwait2 sys_epoll_pwait2 compat_sys_epoll_pwait2 +442 common mount_setattr sys_mount_setattr +443 common quotactl_fd sys_quotactl_fd +444 common landlock_create_ruleset sys_landlock_create_ruleset +445 common landlock_add_rule sys_landlock_add_rule +446 common landlock_restrict_self sys_landlock_restrict_self +# 447 reserved for memfd_secret +448 common process_mrelease sys_process_mrelease +449 common futex_waitv sys_futex_waitv +450 nospu set_mempolicy_home_node sys_set_mempolicy_home_node diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c new file mode 100644 index 000000000..ef9a61718 --- /dev/null +++ b/arch/powerpc/kernel/sysfs.c @@ -0,0 +1,1175 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include <linux/device.h> +#include <linux/cpu.h> +#include <linux/smp.h> +#include <linux/percpu.h> +#include <linux/init.h> +#include <linux/sched.h> +#include <linux/export.h> +#include <linux/nodemask.h> +#include <linux/cpumask.h> +#include <linux/notifier.h> +#include <linux/of.h> + +#include <asm/current.h> +#include <asm/processor.h> +#include <asm/cputable.h> +#include <asm/hvcall.h> +#include <asm/machdep.h> +#include <asm/smp.h> +#include <asm/pmc.h> +#include <asm/firmware.h> +#include <asm/idle.h> +#include <asm/svm.h> + +#include "cacheinfo.h" +#include "setup.h" + +#ifdef CONFIG_PPC64 +#include <asm/paca.h> +#include <asm/lppaca.h> +#endif + +static DEFINE_PER_CPU(struct cpu, cpu_devices); + +#ifdef CONFIG_PPC64 + +/* + * Snooze delay has not been hooked up since 3fa8cad82b94 ("powerpc/pseries/cpuidle: + * smt-snooze-delay cleanup.") and has been broken even longer. As was foretold in + * 2014: + * + * "ppc64_util currently utilises it. Once we fix ppc64_util, propose to clean + * up the kernel code." + * + * powerpc-utils stopped using it as of 1.3.8. At some point in the future this + * code should be removed. + */ + +static ssize_t store_smt_snooze_delay(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t count) +{ + pr_warn_once("%s (%d) stored to unsupported smt_snooze_delay, which has no effect.\n", + current->comm, current->pid); + return count; +} + +static ssize_t show_smt_snooze_delay(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + pr_warn_once("%s (%d) read from unsupported smt_snooze_delay\n", + current->comm, current->pid); + return sprintf(buf, "100\n"); +} + +static DEVICE_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay, + store_smt_snooze_delay); + +static int __init setup_smt_snooze_delay(char *str) +{ + if (!cpu_has_feature(CPU_FTR_SMT)) + return 1; + + pr_warn("smt-snooze-delay command line option has no effect\n"); + return 1; +} +__setup("smt-snooze-delay=", setup_smt_snooze_delay); + +#endif /* CONFIG_PPC64 */ + +#define __SYSFS_SPRSETUP_READ_WRITE(NAME, ADDRESS, EXTRA) \ +static void read_##NAME(void *val) \ +{ \ + *(unsigned long *)val = mfspr(ADDRESS); \ +} \ +static void write_##NAME(void *val) \ +{ \ + EXTRA; \ + mtspr(ADDRESS, *(unsigned long *)val); \ +} + +#define __SYSFS_SPRSETUP_SHOW_STORE(NAME) \ +static ssize_t show_##NAME(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + struct cpu *cpu = container_of(dev, struct cpu, dev); \ + unsigned long val; \ + smp_call_function_single(cpu->dev.id, read_##NAME, &val, 1); \ + return sprintf(buf, "%lx\n", val); \ +} \ +static ssize_t __used \ + store_##NAME(struct device *dev, struct device_attribute *attr, \ + const char *buf, size_t count) \ +{ \ + struct cpu *cpu = container_of(dev, struct cpu, dev); \ + unsigned long val; \ + int ret = sscanf(buf, "%lx", &val); \ + if (ret != 1) \ + return -EINVAL; \ + smp_call_function_single(cpu->dev.id, write_##NAME, &val, 1); \ + return count; \ +} + +#define SYSFS_PMCSETUP(NAME, ADDRESS) \ + __SYSFS_SPRSETUP_READ_WRITE(NAME, ADDRESS, ppc_enable_pmcs()) \ + __SYSFS_SPRSETUP_SHOW_STORE(NAME) +#define SYSFS_SPRSETUP(NAME, ADDRESS) \ + __SYSFS_SPRSETUP_READ_WRITE(NAME, ADDRESS, ) \ + __SYSFS_SPRSETUP_SHOW_STORE(NAME) + +#define SYSFS_SPRSETUP_SHOW_STORE(NAME) \ + __SYSFS_SPRSETUP_SHOW_STORE(NAME) + +#ifdef CONFIG_PPC64 + +/* + * This is the system wide DSCR register default value. Any + * change to this default value through the sysfs interface + * will update all per cpu DSCR default values across the + * system stored in their respective PACA structures. + */ +static unsigned long dscr_default; + +/** + * read_dscr() - Fetch the cpu specific DSCR default + * @val: Returned cpu specific DSCR default value + * + * This function returns the per cpu DSCR default value + * for any cpu which is contained in it's PACA structure. + */ +static void read_dscr(void *val) +{ + *(unsigned long *)val = get_paca()->dscr_default; +} + + +/** + * write_dscr() - Update the cpu specific DSCR default + * @val: New cpu specific DSCR default value to update + * + * This function updates the per cpu DSCR default value + * for any cpu which is contained in it's PACA structure. + */ +static void write_dscr(void *val) +{ + get_paca()->dscr_default = *(unsigned long *)val; + if (!current->thread.dscr_inherit) { + current->thread.dscr = *(unsigned long *)val; + mtspr(SPRN_DSCR, *(unsigned long *)val); + } +} + +SYSFS_SPRSETUP_SHOW_STORE(dscr); +static DEVICE_ATTR(dscr, 0600, show_dscr, store_dscr); + +static void add_write_permission_dev_attr(struct device_attribute *attr) +{ + attr->attr.mode |= 0200; +} + +/** + * show_dscr_default() - Fetch the system wide DSCR default + * @dev: Device structure + * @attr: Device attribute structure + * @buf: Interface buffer + * + * This function returns the system wide DSCR default value. + */ +static ssize_t show_dscr_default(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%lx\n", dscr_default); +} + +/** + * store_dscr_default() - Update the system wide DSCR default + * @dev: Device structure + * @attr: Device attribute structure + * @buf: Interface buffer + * @count: Size of the update + * + * This function updates the system wide DSCR default value. + */ +static ssize_t __used store_dscr_default(struct device *dev, + struct device_attribute *attr, const char *buf, + size_t count) +{ + unsigned long val; + int ret = 0; + + ret = sscanf(buf, "%lx", &val); + if (ret != 1) + return -EINVAL; + dscr_default = val; + + on_each_cpu(write_dscr, &val, 1); + + return count; +} + +static DEVICE_ATTR(dscr_default, 0600, + show_dscr_default, store_dscr_default); + +static void __init sysfs_create_dscr_default(void) +{ + if (cpu_has_feature(CPU_FTR_DSCR)) { + int cpu; + + dscr_default = spr_default_dscr; + for_each_possible_cpu(cpu) + paca_ptrs[cpu]->dscr_default = dscr_default; + + device_create_file(cpu_subsys.dev_root, &dev_attr_dscr_default); + } +} +#endif /* CONFIG_PPC64 */ + +#ifdef CONFIG_PPC_E500 +#define MAX_BIT 63 + +static u64 pw20_wt; +static u64 altivec_idle_wt; + +static unsigned int get_idle_ticks_bit(u64 ns) +{ + u64 cycle; + + if (ns >= 10000) + cycle = div_u64(ns + 500, 1000) * tb_ticks_per_usec; + else + cycle = div_u64(ns * tb_ticks_per_usec, 1000); + + if (!cycle) + return 0; + + return ilog2(cycle); +} + +static void do_show_pwrmgtcr0(void *val) +{ + u32 *value = val; + + *value = mfspr(SPRN_PWRMGTCR0); +} + +static ssize_t show_pw20_state(struct device *dev, + struct device_attribute *attr, char *buf) +{ + u32 value; + unsigned int cpu = dev->id; + + smp_call_function_single(cpu, do_show_pwrmgtcr0, &value, 1); + + value &= PWRMGTCR0_PW20_WAIT; + + return sprintf(buf, "%u\n", value ? 1 : 0); +} + +static void do_store_pw20_state(void *val) +{ + u32 *value = val; + u32 pw20_state; + + pw20_state = mfspr(SPRN_PWRMGTCR0); + + if (*value) + pw20_state |= PWRMGTCR0_PW20_WAIT; + else + pw20_state &= ~PWRMGTCR0_PW20_WAIT; + + mtspr(SPRN_PWRMGTCR0, pw20_state); +} + +static ssize_t store_pw20_state(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + u32 value; + unsigned int cpu = dev->id; + + if (kstrtou32(buf, 0, &value)) + return -EINVAL; + + if (value > 1) + return -EINVAL; + + smp_call_function_single(cpu, do_store_pw20_state, &value, 1); + + return count; +} + +static ssize_t show_pw20_wait_time(struct device *dev, + struct device_attribute *attr, char *buf) +{ + u32 value; + u64 tb_cycle = 1; + u64 time; + + unsigned int cpu = dev->id; + + if (!pw20_wt) { + smp_call_function_single(cpu, do_show_pwrmgtcr0, &value, 1); + value = (value & PWRMGTCR0_PW20_ENT) >> + PWRMGTCR0_PW20_ENT_SHIFT; + + tb_cycle = (tb_cycle << (MAX_BIT - value + 1)); + /* convert ms to ns */ + if (tb_ticks_per_usec > 1000) { + time = div_u64(tb_cycle, tb_ticks_per_usec / 1000); + } else { + u32 rem_us; + + time = div_u64_rem(tb_cycle, tb_ticks_per_usec, + &rem_us); + time = time * 1000 + rem_us * 1000 / tb_ticks_per_usec; + } + } else { + time = pw20_wt; + } + + return sprintf(buf, "%llu\n", time > 0 ? time : 0); +} + +static void set_pw20_wait_entry_bit(void *val) +{ + u32 *value = val; + u32 pw20_idle; + + pw20_idle = mfspr(SPRN_PWRMGTCR0); + + /* Set Automatic PW20 Core Idle Count */ + /* clear count */ + pw20_idle &= ~PWRMGTCR0_PW20_ENT; + + /* set count */ + pw20_idle |= ((MAX_BIT - *value) << PWRMGTCR0_PW20_ENT_SHIFT); + + mtspr(SPRN_PWRMGTCR0, pw20_idle); +} + +static ssize_t store_pw20_wait_time(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + u32 entry_bit; + u64 value; + + unsigned int cpu = dev->id; + + if (kstrtou64(buf, 0, &value)) + return -EINVAL; + + if (!value) + return -EINVAL; + + entry_bit = get_idle_ticks_bit(value); + if (entry_bit > MAX_BIT) + return -EINVAL; + + pw20_wt = value; + + smp_call_function_single(cpu, set_pw20_wait_entry_bit, + &entry_bit, 1); + + return count; +} + +static ssize_t show_altivec_idle(struct device *dev, + struct device_attribute *attr, char *buf) +{ + u32 value; + unsigned int cpu = dev->id; + + smp_call_function_single(cpu, do_show_pwrmgtcr0, &value, 1); + + value &= PWRMGTCR0_AV_IDLE_PD_EN; + + return sprintf(buf, "%u\n", value ? 1 : 0); +} + +static void do_store_altivec_idle(void *val) +{ + u32 *value = val; + u32 altivec_idle; + + altivec_idle = mfspr(SPRN_PWRMGTCR0); + + if (*value) + altivec_idle |= PWRMGTCR0_AV_IDLE_PD_EN; + else + altivec_idle &= ~PWRMGTCR0_AV_IDLE_PD_EN; + + mtspr(SPRN_PWRMGTCR0, altivec_idle); +} + +static ssize_t store_altivec_idle(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + u32 value; + unsigned int cpu = dev->id; + + if (kstrtou32(buf, 0, &value)) + return -EINVAL; + + if (value > 1) + return -EINVAL; + + smp_call_function_single(cpu, do_store_altivec_idle, &value, 1); + + return count; +} + +static ssize_t show_altivec_idle_wait_time(struct device *dev, + struct device_attribute *attr, char *buf) +{ + u32 value; + u64 tb_cycle = 1; + u64 time; + + unsigned int cpu = dev->id; + + if (!altivec_idle_wt) { + smp_call_function_single(cpu, do_show_pwrmgtcr0, &value, 1); + value = (value & PWRMGTCR0_AV_IDLE_CNT) >> + PWRMGTCR0_AV_IDLE_CNT_SHIFT; + + tb_cycle = (tb_cycle << (MAX_BIT - value + 1)); + /* convert ms to ns */ + if (tb_ticks_per_usec > 1000) { + time = div_u64(tb_cycle, tb_ticks_per_usec / 1000); + } else { + u32 rem_us; + + time = div_u64_rem(tb_cycle, tb_ticks_per_usec, + &rem_us); + time = time * 1000 + rem_us * 1000 / tb_ticks_per_usec; + } + } else { + time = altivec_idle_wt; + } + + return sprintf(buf, "%llu\n", time > 0 ? time : 0); +} + +static void set_altivec_idle_wait_entry_bit(void *val) +{ + u32 *value = val; + u32 altivec_idle; + + altivec_idle = mfspr(SPRN_PWRMGTCR0); + + /* Set Automatic AltiVec Idle Count */ + /* clear count */ + altivec_idle &= ~PWRMGTCR0_AV_IDLE_CNT; + + /* set count */ + altivec_idle |= ((MAX_BIT - *value) << PWRMGTCR0_AV_IDLE_CNT_SHIFT); + + mtspr(SPRN_PWRMGTCR0, altivec_idle); +} + +static ssize_t store_altivec_idle_wait_time(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + u32 entry_bit; + u64 value; + + unsigned int cpu = dev->id; + + if (kstrtou64(buf, 0, &value)) + return -EINVAL; + + if (!value) + return -EINVAL; + + entry_bit = get_idle_ticks_bit(value); + if (entry_bit > MAX_BIT) + return -EINVAL; + + altivec_idle_wt = value; + + smp_call_function_single(cpu, set_altivec_idle_wait_entry_bit, + &entry_bit, 1); + + return count; +} + +/* + * Enable/Disable interface: + * 0, disable. 1, enable. + */ +static DEVICE_ATTR(pw20_state, 0600, show_pw20_state, store_pw20_state); +static DEVICE_ATTR(altivec_idle, 0600, show_altivec_idle, store_altivec_idle); + +/* + * Set wait time interface:(Nanosecond) + * Example: Base on TBfreq is 41MHZ. + * 1~48(ns): TB[63] + * 49~97(ns): TB[62] + * 98~195(ns): TB[61] + * 196~390(ns): TB[60] + * 391~780(ns): TB[59] + * 781~1560(ns): TB[58] + * ... + */ +static DEVICE_ATTR(pw20_wait_time, 0600, + show_pw20_wait_time, + store_pw20_wait_time); +static DEVICE_ATTR(altivec_idle_wait_time, 0600, + show_altivec_idle_wait_time, + store_altivec_idle_wait_time); +#endif + +/* + * Enabling PMCs will slow partition context switch times so we only do + * it the first time we write to the PMCs. + */ + +static DEFINE_PER_CPU(char, pmcs_enabled); + +void ppc_enable_pmcs(void) +{ + ppc_set_pmu_inuse(1); + + /* Only need to enable them once */ + if (__this_cpu_read(pmcs_enabled)) + return; + + __this_cpu_write(pmcs_enabled, 1); + + if (ppc_md.enable_pmcs) + ppc_md.enable_pmcs(); +} +EXPORT_SYMBOL(ppc_enable_pmcs); + + + +/* Let's define all possible registers, we'll only hook up the ones + * that are implemented on the current processor + */ + +#ifdef CONFIG_PMU_SYSFS +#if defined(CONFIG_PPC64) || defined(CONFIG_PPC_BOOK3S_32) +#define HAS_PPC_PMC_CLASSIC 1 +#define HAS_PPC_PMC_IBM 1 +#endif + +#ifdef CONFIG_PPC64 +#define HAS_PPC_PMC_PA6T 1 +#define HAS_PPC_PMC56 1 +#endif + +#ifdef CONFIG_PPC_BOOK3S_32 +#define HAS_PPC_PMC_G4 1 +#endif +#endif /* CONFIG_PMU_SYSFS */ + +#if defined(CONFIG_PPC64) && defined(CONFIG_DEBUG_MISC) +#define HAS_PPC_PA6T +#endif +/* + * SPRs which are not related to PMU. + */ +#ifdef CONFIG_PPC64 +SYSFS_SPRSETUP(purr, SPRN_PURR); +SYSFS_SPRSETUP(spurr, SPRN_SPURR); +SYSFS_SPRSETUP(pir, SPRN_PIR); +SYSFS_SPRSETUP(tscr, SPRN_TSCR); + +/* + Lets only enable read for phyp resources and + enable write when needed with a separate function. + Lets be conservative and default to pseries. +*/ +static DEVICE_ATTR(spurr, 0400, show_spurr, NULL); +static DEVICE_ATTR(purr, 0400, show_purr, store_purr); +static DEVICE_ATTR(pir, 0400, show_pir, NULL); +static DEVICE_ATTR(tscr, 0600, show_tscr, store_tscr); +#endif /* CONFIG_PPC64 */ + +#ifdef HAS_PPC_PMC_CLASSIC +SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0); +SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1); +SYSFS_PMCSETUP(pmc1, SPRN_PMC1); +SYSFS_PMCSETUP(pmc2, SPRN_PMC2); +SYSFS_PMCSETUP(pmc3, SPRN_PMC3); +SYSFS_PMCSETUP(pmc4, SPRN_PMC4); +SYSFS_PMCSETUP(pmc5, SPRN_PMC5); +SYSFS_PMCSETUP(pmc6, SPRN_PMC6); +#endif + +#ifdef HAS_PPC_PMC_G4 +SYSFS_PMCSETUP(mmcr2, SPRN_MMCR2); +#endif + +#ifdef HAS_PPC_PMC56 +SYSFS_PMCSETUP(pmc7, SPRN_PMC7); +SYSFS_PMCSETUP(pmc8, SPRN_PMC8); + +SYSFS_PMCSETUP(mmcra, SPRN_MMCRA); +SYSFS_PMCSETUP(mmcr3, SPRN_MMCR3); + +static DEVICE_ATTR(mmcra, 0600, show_mmcra, store_mmcra); +static DEVICE_ATTR(mmcr3, 0600, show_mmcr3, store_mmcr3); +#endif /* HAS_PPC_PMC56 */ + + + + +#ifdef HAS_PPC_PMC_PA6T +SYSFS_PMCSETUP(pa6t_pmc0, SPRN_PA6T_PMC0); +SYSFS_PMCSETUP(pa6t_pmc1, SPRN_PA6T_PMC1); +SYSFS_PMCSETUP(pa6t_pmc2, SPRN_PA6T_PMC2); +SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3); +SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4); +SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5); +#endif + +#ifdef HAS_PPC_PA6T +SYSFS_SPRSETUP(hid0, SPRN_HID0); +SYSFS_SPRSETUP(hid1, SPRN_HID1); +SYSFS_SPRSETUP(hid4, SPRN_HID4); +SYSFS_SPRSETUP(hid5, SPRN_HID5); +SYSFS_SPRSETUP(ima0, SPRN_PA6T_IMA0); +SYSFS_SPRSETUP(ima1, SPRN_PA6T_IMA1); +SYSFS_SPRSETUP(ima2, SPRN_PA6T_IMA2); +SYSFS_SPRSETUP(ima3, SPRN_PA6T_IMA3); +SYSFS_SPRSETUP(ima4, SPRN_PA6T_IMA4); +SYSFS_SPRSETUP(ima5, SPRN_PA6T_IMA5); +SYSFS_SPRSETUP(ima6, SPRN_PA6T_IMA6); +SYSFS_SPRSETUP(ima7, SPRN_PA6T_IMA7); +SYSFS_SPRSETUP(ima8, SPRN_PA6T_IMA8); +SYSFS_SPRSETUP(ima9, SPRN_PA6T_IMA9); +SYSFS_SPRSETUP(imaat, SPRN_PA6T_IMAAT); +SYSFS_SPRSETUP(btcr, SPRN_PA6T_BTCR); +SYSFS_SPRSETUP(pccr, SPRN_PA6T_PCCR); +SYSFS_SPRSETUP(rpccr, SPRN_PA6T_RPCCR); +SYSFS_SPRSETUP(der, SPRN_PA6T_DER); +SYSFS_SPRSETUP(mer, SPRN_PA6T_MER); +SYSFS_SPRSETUP(ber, SPRN_PA6T_BER); +SYSFS_SPRSETUP(ier, SPRN_PA6T_IER); +SYSFS_SPRSETUP(sier, SPRN_PA6T_SIER); +SYSFS_SPRSETUP(siar, SPRN_PA6T_SIAR); +SYSFS_SPRSETUP(tsr0, SPRN_PA6T_TSR0); +SYSFS_SPRSETUP(tsr1, SPRN_PA6T_TSR1); +SYSFS_SPRSETUP(tsr2, SPRN_PA6T_TSR2); +SYSFS_SPRSETUP(tsr3, SPRN_PA6T_TSR3); +#endif /* HAS_PPC_PA6T */ + +#ifdef HAS_PPC_PMC_IBM +static struct device_attribute ibm_common_attrs[] = { + __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), + __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), +}; +#endif /* HAS_PPC_PMC_IBM */ + +#ifdef HAS_PPC_PMC_G4 +static struct device_attribute g4_common_attrs[] = { + __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), + __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), + __ATTR(mmcr2, 0600, show_mmcr2, store_mmcr2), +}; +#endif /* HAS_PPC_PMC_G4 */ + +#ifdef HAS_PPC_PMC_CLASSIC +static struct device_attribute classic_pmc_attrs[] = { + __ATTR(pmc1, 0600, show_pmc1, store_pmc1), + __ATTR(pmc2, 0600, show_pmc2, store_pmc2), + __ATTR(pmc3, 0600, show_pmc3, store_pmc3), + __ATTR(pmc4, 0600, show_pmc4, store_pmc4), + __ATTR(pmc5, 0600, show_pmc5, store_pmc5), + __ATTR(pmc6, 0600, show_pmc6, store_pmc6), +#ifdef HAS_PPC_PMC56 + __ATTR(pmc7, 0600, show_pmc7, store_pmc7), + __ATTR(pmc8, 0600, show_pmc8, store_pmc8), +#endif +}; +#endif + +#if defined(HAS_PPC_PMC_PA6T) || defined(HAS_PPC_PA6T) +static struct device_attribute pa6t_attrs[] = { +#ifdef HAS_PPC_PMC_PA6T + __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), + __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), + __ATTR(pmc0, 0600, show_pa6t_pmc0, store_pa6t_pmc0), + __ATTR(pmc1, 0600, show_pa6t_pmc1, store_pa6t_pmc1), + __ATTR(pmc2, 0600, show_pa6t_pmc2, store_pa6t_pmc2), + __ATTR(pmc3, 0600, show_pa6t_pmc3, store_pa6t_pmc3), + __ATTR(pmc4, 0600, show_pa6t_pmc4, store_pa6t_pmc4), + __ATTR(pmc5, 0600, show_pa6t_pmc5, store_pa6t_pmc5), +#endif +#ifdef HAS_PPC_PA6T + __ATTR(hid0, 0600, show_hid0, store_hid0), + __ATTR(hid1, 0600, show_hid1, store_hid1), + __ATTR(hid4, 0600, show_hid4, store_hid4), + __ATTR(hid5, 0600, show_hid5, store_hid5), + __ATTR(ima0, 0600, show_ima0, store_ima0), + __ATTR(ima1, 0600, show_ima1, store_ima1), + __ATTR(ima2, 0600, show_ima2, store_ima2), + __ATTR(ima3, 0600, show_ima3, store_ima3), + __ATTR(ima4, 0600, show_ima4, store_ima4), + __ATTR(ima5, 0600, show_ima5, store_ima5), + __ATTR(ima6, 0600, show_ima6, store_ima6), + __ATTR(ima7, 0600, show_ima7, store_ima7), + __ATTR(ima8, 0600, show_ima8, store_ima8), + __ATTR(ima9, 0600, show_ima9, store_ima9), + __ATTR(imaat, 0600, show_imaat, store_imaat), + __ATTR(btcr, 0600, show_btcr, store_btcr), + __ATTR(pccr, 0600, show_pccr, store_pccr), + __ATTR(rpccr, 0600, show_rpccr, store_rpccr), + __ATTR(der, 0600, show_der, store_der), + __ATTR(mer, 0600, show_mer, store_mer), + __ATTR(ber, 0600, show_ber, store_ber), + __ATTR(ier, 0600, show_ier, store_ier), + __ATTR(sier, 0600, show_sier, store_sier), + __ATTR(siar, 0600, show_siar, store_siar), + __ATTR(tsr0, 0600, show_tsr0, store_tsr0), + __ATTR(tsr1, 0600, show_tsr1, store_tsr1), + __ATTR(tsr2, 0600, show_tsr2, store_tsr2), + __ATTR(tsr3, 0600, show_tsr3, store_tsr3), +#endif /* HAS_PPC_PA6T */ +}; +#endif + +#ifdef CONFIG_PPC_SVM +static ssize_t show_svm(struct device *dev, struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%u\n", is_secure_guest()); +} +static DEVICE_ATTR(svm, 0444, show_svm, NULL); + +static void __init create_svm_file(void) +{ + device_create_file(cpu_subsys.dev_root, &dev_attr_svm); +} +#else +static void __init create_svm_file(void) +{ +} +#endif /* CONFIG_PPC_SVM */ + +#ifdef CONFIG_PPC_PSERIES +static void read_idle_purr(void *val) +{ + u64 *ret = val; + + *ret = read_this_idle_purr(); +} + +static ssize_t idle_purr_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cpu *cpu = container_of(dev, struct cpu, dev); + u64 val; + + smp_call_function_single(cpu->dev.id, read_idle_purr, &val, 1); + return sprintf(buf, "%llx\n", val); +} +static DEVICE_ATTR(idle_purr, 0400, idle_purr_show, NULL); + +static void create_idle_purr_file(struct device *s) +{ + if (firmware_has_feature(FW_FEATURE_LPAR)) + device_create_file(s, &dev_attr_idle_purr); +} + +static void remove_idle_purr_file(struct device *s) +{ + if (firmware_has_feature(FW_FEATURE_LPAR)) + device_remove_file(s, &dev_attr_idle_purr); +} + +static void read_idle_spurr(void *val) +{ + u64 *ret = val; + + *ret = read_this_idle_spurr(); +} + +static ssize_t idle_spurr_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cpu *cpu = container_of(dev, struct cpu, dev); + u64 val; + + smp_call_function_single(cpu->dev.id, read_idle_spurr, &val, 1); + return sprintf(buf, "%llx\n", val); +} +static DEVICE_ATTR(idle_spurr, 0400, idle_spurr_show, NULL); + +static void create_idle_spurr_file(struct device *s) +{ + if (firmware_has_feature(FW_FEATURE_LPAR)) + device_create_file(s, &dev_attr_idle_spurr); +} + +static void remove_idle_spurr_file(struct device *s) +{ + if (firmware_has_feature(FW_FEATURE_LPAR)) + device_remove_file(s, &dev_attr_idle_spurr); +} + +#else /* CONFIG_PPC_PSERIES */ +#define create_idle_purr_file(s) +#define remove_idle_purr_file(s) +#define create_idle_spurr_file(s) +#define remove_idle_spurr_file(s) +#endif /* CONFIG_PPC_PSERIES */ + +static int register_cpu_online(unsigned int cpu) +{ + struct cpu *c = &per_cpu(cpu_devices, cpu); + struct device *s = &c->dev; + struct device_attribute *attrs, *pmc_attrs; + int i, nattrs; + + /* For cpus present at boot a reference was already grabbed in register_cpu() */ + if (!s->of_node) + s->of_node = of_get_cpu_node(cpu, NULL); + +#ifdef CONFIG_PPC64 + if (cpu_has_feature(CPU_FTR_SMT)) + device_create_file(s, &dev_attr_smt_snooze_delay); +#endif + + /* PMC stuff */ + switch (cur_cpu_spec->pmc_type) { +#ifdef HAS_PPC_PMC_IBM + case PPC_PMC_IBM: + attrs = ibm_common_attrs; + nattrs = ARRAY_SIZE(ibm_common_attrs); + pmc_attrs = classic_pmc_attrs; + break; +#endif /* HAS_PPC_PMC_IBM */ +#ifdef HAS_PPC_PMC_G4 + case PPC_PMC_G4: + attrs = g4_common_attrs; + nattrs = ARRAY_SIZE(g4_common_attrs); + pmc_attrs = classic_pmc_attrs; + break; +#endif /* HAS_PPC_PMC_G4 */ +#if defined(HAS_PPC_PMC_PA6T) || defined(HAS_PPC_PA6T) + case PPC_PMC_PA6T: + /* PA Semi starts counting at PMC0 */ + attrs = pa6t_attrs; + nattrs = ARRAY_SIZE(pa6t_attrs); + pmc_attrs = NULL; + break; +#endif + default: + attrs = NULL; + nattrs = 0; + pmc_attrs = NULL; + } + + for (i = 0; i < nattrs; i++) + device_create_file(s, &attrs[i]); + + if (pmc_attrs) + for (i = 0; i < cur_cpu_spec->num_pmcs; i++) + device_create_file(s, &pmc_attrs[i]); + +#ifdef CONFIG_PPC64 +#ifdef CONFIG_PMU_SYSFS + if (cpu_has_feature(CPU_FTR_MMCRA)) + device_create_file(s, &dev_attr_mmcra); + + if (cpu_has_feature(CPU_FTR_ARCH_31)) + device_create_file(s, &dev_attr_mmcr3); +#endif /* CONFIG_PMU_SYSFS */ + + if (cpu_has_feature(CPU_FTR_PURR)) { + if (!firmware_has_feature(FW_FEATURE_LPAR)) + add_write_permission_dev_attr(&dev_attr_purr); + device_create_file(s, &dev_attr_purr); + create_idle_purr_file(s); + } + + if (cpu_has_feature(CPU_FTR_SPURR)) { + device_create_file(s, &dev_attr_spurr); + create_idle_spurr_file(s); + } + + if (cpu_has_feature(CPU_FTR_DSCR)) + device_create_file(s, &dev_attr_dscr); + + if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2)) + device_create_file(s, &dev_attr_pir); + + if (cpu_has_feature(CPU_FTR_ARCH_206) && + !firmware_has_feature(FW_FEATURE_LPAR)) + device_create_file(s, &dev_attr_tscr); +#endif /* CONFIG_PPC64 */ + +#ifdef CONFIG_PPC_E500 + if (PVR_VER(cur_cpu_spec->pvr_value) == PVR_VER_E6500) { + device_create_file(s, &dev_attr_pw20_state); + device_create_file(s, &dev_attr_pw20_wait_time); + + device_create_file(s, &dev_attr_altivec_idle); + device_create_file(s, &dev_attr_altivec_idle_wait_time); + } +#endif + cacheinfo_cpu_online(cpu); + return 0; +} + +#ifdef CONFIG_HOTPLUG_CPU +static int unregister_cpu_online(unsigned int cpu) +{ + struct cpu *c = &per_cpu(cpu_devices, cpu); + struct device *s = &c->dev; + struct device_attribute *attrs, *pmc_attrs; + int i, nattrs; + + if (WARN_RATELIMIT(!c->hotpluggable, "cpu %d can't be offlined\n", cpu)) + return -EBUSY; + +#ifdef CONFIG_PPC64 + if (cpu_has_feature(CPU_FTR_SMT)) + device_remove_file(s, &dev_attr_smt_snooze_delay); +#endif + + /* PMC stuff */ + switch (cur_cpu_spec->pmc_type) { +#ifdef HAS_PPC_PMC_IBM + case PPC_PMC_IBM: + attrs = ibm_common_attrs; + nattrs = ARRAY_SIZE(ibm_common_attrs); + pmc_attrs = classic_pmc_attrs; + break; +#endif /* HAS_PPC_PMC_IBM */ +#ifdef HAS_PPC_PMC_G4 + case PPC_PMC_G4: + attrs = g4_common_attrs; + nattrs = ARRAY_SIZE(g4_common_attrs); + pmc_attrs = classic_pmc_attrs; + break; +#endif /* HAS_PPC_PMC_G4 */ +#if defined(HAS_PPC_PMC_PA6T) || defined(HAS_PPC_PA6T) + case PPC_PMC_PA6T: + /* PA Semi starts counting at PMC0 */ + attrs = pa6t_attrs; + nattrs = ARRAY_SIZE(pa6t_attrs); + pmc_attrs = NULL; + break; +#endif + default: + attrs = NULL; + nattrs = 0; + pmc_attrs = NULL; + } + + for (i = 0; i < nattrs; i++) + device_remove_file(s, &attrs[i]); + + if (pmc_attrs) + for (i = 0; i < cur_cpu_spec->num_pmcs; i++) + device_remove_file(s, &pmc_attrs[i]); + +#ifdef CONFIG_PPC64 +#ifdef CONFIG_PMU_SYSFS + if (cpu_has_feature(CPU_FTR_MMCRA)) + device_remove_file(s, &dev_attr_mmcra); + + if (cpu_has_feature(CPU_FTR_ARCH_31)) + device_remove_file(s, &dev_attr_mmcr3); +#endif /* CONFIG_PMU_SYSFS */ + + if (cpu_has_feature(CPU_FTR_PURR)) { + device_remove_file(s, &dev_attr_purr); + remove_idle_purr_file(s); + } + + if (cpu_has_feature(CPU_FTR_SPURR)) { + device_remove_file(s, &dev_attr_spurr); + remove_idle_spurr_file(s); + } + + if (cpu_has_feature(CPU_FTR_DSCR)) + device_remove_file(s, &dev_attr_dscr); + + if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2)) + device_remove_file(s, &dev_attr_pir); + + if (cpu_has_feature(CPU_FTR_ARCH_206) && + !firmware_has_feature(FW_FEATURE_LPAR)) + device_remove_file(s, &dev_attr_tscr); +#endif /* CONFIG_PPC64 */ + +#ifdef CONFIG_PPC_E500 + if (PVR_VER(cur_cpu_spec->pvr_value) == PVR_VER_E6500) { + device_remove_file(s, &dev_attr_pw20_state); + device_remove_file(s, &dev_attr_pw20_wait_time); + + device_remove_file(s, &dev_attr_altivec_idle); + device_remove_file(s, &dev_attr_altivec_idle_wait_time); + } +#endif + cacheinfo_cpu_offline(cpu); + of_node_put(s->of_node); + s->of_node = NULL; + return 0; +} +#else /* !CONFIG_HOTPLUG_CPU */ +#define unregister_cpu_online NULL +#endif + +#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE +ssize_t arch_cpu_probe(const char *buf, size_t count) +{ + if (ppc_md.cpu_probe) + return ppc_md.cpu_probe(buf, count); + + return -EINVAL; +} + +ssize_t arch_cpu_release(const char *buf, size_t count) +{ + if (ppc_md.cpu_release) + return ppc_md.cpu_release(buf, count); + + return -EINVAL; +} +#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */ + +static DEFINE_MUTEX(cpu_mutex); + +int cpu_add_dev_attr(struct device_attribute *attr) +{ + int cpu; + + mutex_lock(&cpu_mutex); + + for_each_possible_cpu(cpu) { + device_create_file(get_cpu_device(cpu), attr); + } + + mutex_unlock(&cpu_mutex); + return 0; +} +EXPORT_SYMBOL_GPL(cpu_add_dev_attr); + +int cpu_add_dev_attr_group(struct attribute_group *attrs) +{ + int cpu; + struct device *dev; + int ret; + + mutex_lock(&cpu_mutex); + + for_each_possible_cpu(cpu) { + dev = get_cpu_device(cpu); + ret = sysfs_create_group(&dev->kobj, attrs); + WARN_ON(ret != 0); + } + + mutex_unlock(&cpu_mutex); + return 0; +} +EXPORT_SYMBOL_GPL(cpu_add_dev_attr_group); + + +void cpu_remove_dev_attr(struct device_attribute *attr) +{ + int cpu; + + mutex_lock(&cpu_mutex); + + for_each_possible_cpu(cpu) { + device_remove_file(get_cpu_device(cpu), attr); + } + + mutex_unlock(&cpu_mutex); +} +EXPORT_SYMBOL_GPL(cpu_remove_dev_attr); + +void cpu_remove_dev_attr_group(struct attribute_group *attrs) +{ + int cpu; + struct device *dev; + + mutex_lock(&cpu_mutex); + + for_each_possible_cpu(cpu) { + dev = get_cpu_device(cpu); + sysfs_remove_group(&dev->kobj, attrs); + } + + mutex_unlock(&cpu_mutex); +} +EXPORT_SYMBOL_GPL(cpu_remove_dev_attr_group); + + +/* NUMA stuff */ + +#ifdef CONFIG_NUMA +int sysfs_add_device_to_node(struct device *dev, int nid) +{ + struct node *node = node_devices[nid]; + return sysfs_create_link(&node->dev.kobj, &dev->kobj, + kobject_name(&dev->kobj)); +} +EXPORT_SYMBOL_GPL(sysfs_add_device_to_node); + +void sysfs_remove_device_from_node(struct device *dev, int nid) +{ + struct node *node = node_devices[nid]; + sysfs_remove_link(&node->dev.kobj, kobject_name(&dev->kobj)); +} +EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node); +#endif + +/* Only valid if CPU is present. */ +static ssize_t show_physical_id(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cpu *cpu = container_of(dev, struct cpu, dev); + + return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->dev.id)); +} +static DEVICE_ATTR(physical_id, 0444, show_physical_id, NULL); + +static int __init topology_init(void) +{ + int cpu, r; + + for_each_possible_cpu(cpu) { + struct cpu *c = &per_cpu(cpu_devices, cpu); + +#ifdef CONFIG_HOTPLUG_CPU + /* + * For now, we just see if the system supports making + * the RTAS calls for CPU hotplug. But, there may be a + * more comprehensive way to do this for an individual + * CPU. For instance, the boot cpu might never be valid + * for hotplugging. + */ + if (smp_ops && smp_ops->cpu_offline_self) + c->hotpluggable = 1; +#endif + + if (cpu_online(cpu) || c->hotpluggable) { + register_cpu(c, cpu); + + device_create_file(&c->dev, &dev_attr_physical_id); + } + } + r = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "powerpc/topology:online", + register_cpu_online, unregister_cpu_online); + WARN_ON(r < 0); +#ifdef CONFIG_PPC64 + sysfs_create_dscr_default(); +#endif /* CONFIG_PPC64 */ + + create_svm_file(); + + return 0; +} +subsys_initcall(topology_init); diff --git a/arch/powerpc/kernel/systbl.c b/arch/powerpc/kernel/systbl.c new file mode 100644 index 000000000..4305f2a21 --- /dev/null +++ b/arch/powerpc/kernel/systbl.c @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * This file contains the table of syscall-handling functions. + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * + * Largely rewritten by Cort Dougan (cort@cs.nmt.edu) + * and Paul Mackerras. + * + * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com) + * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com) + */ + +#include <linux/syscalls.h> +#include <linux/compat.h> +#include <asm/unistd.h> +#include <asm/syscalls.h> + +#undef __SYSCALL_WITH_COMPAT +#define __SYSCALL_WITH_COMPAT(nr, entry, compat) __SYSCALL(nr, entry) + +#undef __SYSCALL +#ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER +#define __SYSCALL(nr, entry) [nr] = entry, +#else +/* + * Coerce syscall handlers with arbitrary parameters to common type + * requires cast to void* to avoid -Wcast-function-type. + */ +#define __SYSCALL(nr, entry) [nr] = (void *) entry, +#endif + +const syscall_fn sys_call_table[] = { +#ifdef CONFIG_PPC64 +#include <asm/syscall_table_64.h> +#else +#include <asm/syscall_table_32.h> +#endif +}; + +#ifdef CONFIG_COMPAT +#undef __SYSCALL_WITH_COMPAT +#define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, compat) +const syscall_fn compat_sys_call_table[] = { +#include <asm/syscall_table_32.h> +}; +#endif /* CONFIG_COMPAT */ diff --git a/arch/powerpc/kernel/tau_6xx.c b/arch/powerpc/kernel/tau_6xx.c new file mode 100644 index 000000000..828d0f410 --- /dev/null +++ b/arch/powerpc/kernel/tau_6xx.c @@ -0,0 +1,237 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * temp.c Thermal management for cpu's with Thermal Assist Units + * + * Written by Troy Benjegerdes <hozer@drgw.net> + * + * TODO: + * dynamic power management to limit peak CPU temp (using ICTC) + * calibration??? + * + * Silly, crazy ideas: use cpu load (from scheduler) and ICTC to extend battery + * life in portables, and add a 'performance/watt' metric somewhere in /proc + */ + +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/param.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/workqueue.h> + +#include <asm/interrupt.h> +#include <asm/io.h> +#include <asm/reg.h> +#include <asm/nvram.h> +#include <asm/cache.h> +#include <asm/8xx_immap.h> +#include <asm/machdep.h> + +#include "setup.h" + +static struct tau_temp +{ + int interrupts; + unsigned char low; + unsigned char high; + unsigned char grew; +} tau[NR_CPUS]; + +static bool tau_int_enable; + +/* TODO: put these in a /proc interface, with some sanity checks, and maybe + * dynamic adjustment to minimize # of interrupts */ +/* configurable values for step size and how much to expand the window when + * we get an interrupt. These are based on the limit that was out of range */ +#define step_size 2 /* step size when temp goes out of range */ +#define window_expand 1 /* expand the window by this much */ +/* configurable values for shrinking the window */ +#define shrink_timer 2000 /* period between shrinking the window */ +#define min_window 2 /* minimum window size, degrees C */ + +static void set_thresholds(unsigned long cpu) +{ + u32 maybe_tie = tau_int_enable ? THRM1_TIE : 0; + + /* setup THRM1, threshold, valid bit, interrupt when below threshold */ + mtspr(SPRN_THRM1, THRM1_THRES(tau[cpu].low) | THRM1_V | maybe_tie | THRM1_TID); + + /* setup THRM2, threshold, valid bit, interrupt when above threshold */ + mtspr(SPRN_THRM2, THRM1_THRES(tau[cpu].high) | THRM1_V | maybe_tie); +} + +static void TAUupdate(int cpu) +{ + u32 thrm; + u32 bits = THRM1_TIV | THRM1_TIN | THRM1_V; + + /* if both thresholds are crossed, the step_sizes cancel out + * and the window winds up getting expanded twice. */ + thrm = mfspr(SPRN_THRM1); + if ((thrm & bits) == bits) { + mtspr(SPRN_THRM1, 0); + + if (tau[cpu].low >= step_size) { + tau[cpu].low -= step_size; + tau[cpu].high -= (step_size - window_expand); + } + tau[cpu].grew = 1; + pr_debug("%s: low threshold crossed\n", __func__); + } + thrm = mfspr(SPRN_THRM2); + if ((thrm & bits) == bits) { + mtspr(SPRN_THRM2, 0); + + if (tau[cpu].high <= 127 - step_size) { + tau[cpu].low += (step_size - window_expand); + tau[cpu].high += step_size; + } + tau[cpu].grew = 1; + pr_debug("%s: high threshold crossed\n", __func__); + } +} + +#ifdef CONFIG_TAU_INT +/* + * TAU interrupts - called when we have a thermal assist unit interrupt + * with interrupts disabled + */ + +DEFINE_INTERRUPT_HANDLER_ASYNC(TAUException) +{ + int cpu = smp_processor_id(); + + tau[cpu].interrupts++; + + TAUupdate(cpu); +} +#endif /* CONFIG_TAU_INT */ + +static void tau_timeout(void * info) +{ + int cpu; + int size; + int shrink; + + cpu = smp_processor_id(); + + if (!tau_int_enable) + TAUupdate(cpu); + + /* Stop thermal sensor comparisons and interrupts */ + mtspr(SPRN_THRM3, 0); + + size = tau[cpu].high - tau[cpu].low; + if (size > min_window && ! tau[cpu].grew) { + /* do an exponential shrink of half the amount currently over size */ + shrink = (2 + size - min_window) / 4; + if (shrink) { + tau[cpu].low += shrink; + tau[cpu].high -= shrink; + } else { /* size must have been min_window + 1 */ + tau[cpu].low += 1; +#if 1 /* debug */ + if ((tau[cpu].high - tau[cpu].low) != min_window){ + printk(KERN_ERR "temp.c: line %d, logic error\n", __LINE__); + } +#endif + } + } + + tau[cpu].grew = 0; + + set_thresholds(cpu); + + /* Restart thermal sensor comparisons and interrupts. + * The "PowerPC 740 and PowerPC 750 Microprocessor Datasheet" + * recommends that "the maximum value be set in THRM3 under all + * conditions." + */ + mtspr(SPRN_THRM3, THRM3_SITV(0x1fff) | THRM3_E); +} + +static struct workqueue_struct *tau_workq; + +static void tau_work_func(struct work_struct *work) +{ + msleep(shrink_timer); + on_each_cpu(tau_timeout, NULL, 0); + /* schedule ourselves to be run again */ + queue_work(tau_workq, work); +} + +static DECLARE_WORK(tau_work, tau_work_func); + +/* + * setup the TAU + * + * Set things up to use THRM1 as a temperature lower bound, and THRM2 as an upper bound. + * Start off at zero + */ + +int tau_initialized = 0; + +static void __init TAU_init_smp(void *info) +{ + unsigned long cpu = smp_processor_id(); + + /* set these to a reasonable value and let the timer shrink the + * window */ + tau[cpu].low = 5; + tau[cpu].high = 120; + + set_thresholds(cpu); +} + +static int __init TAU_init(void) +{ + /* We assume in SMP that if one CPU has TAU support, they + * all have it --BenH + */ + if (!cpu_has_feature(CPU_FTR_TAU)) { + printk("Thermal assist unit not available\n"); + tau_initialized = 0; + return 1; + } + + tau_int_enable = IS_ENABLED(CONFIG_TAU_INT) && + !strcmp(cur_cpu_spec->platform, "ppc750"); + + tau_workq = alloc_workqueue("tau", WQ_UNBOUND, 1); + if (!tau_workq) + return -ENOMEM; + + on_each_cpu(TAU_init_smp, NULL, 0); + + queue_work(tau_workq, &tau_work); + + pr_info("Thermal assist unit using %s, shrink_timer: %d ms\n", + tau_int_enable ? "interrupts" : "workqueue", shrink_timer); + tau_initialized = 1; + + return 0; +} + +__initcall(TAU_init); + +/* + * return current temp + */ + +u32 cpu_temp_both(unsigned long cpu) +{ + return ((tau[cpu].high << 16) | tau[cpu].low); +} + +u32 cpu_temp(unsigned long cpu) +{ + return ((tau[cpu].high + tau[cpu].low) / 2); +} + +u32 tau_interrupts(unsigned long cpu) +{ + return (tau[cpu].interrupts); +} diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c new file mode 100644 index 000000000..285159e65 --- /dev/null +++ b/arch/powerpc/kernel/time.c @@ -0,0 +1,1047 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Common time routines among all ppc machines. + * + * Written by Cort Dougan (cort@cs.nmt.edu) to merge + * Paul Mackerras' version and mine for PReP and Pmac. + * MPC8xx/MBX changes by Dan Malek (dmalek@jlc.net). + * Converted for 64-bit by Mike Corrigan (mikejc@us.ibm.com) + * + * First round of bugfixes by Gabriel Paubert (paubert@iram.es) + * to make clock more stable (2.4.0-test5). The only thing + * that this code assumes is that the timebases have been synchronized + * by firmware on SMP and are never stopped (never do sleep + * on SMP then, nap and doze are OK). + * + * Speeded up do_gettimeofday by getting rid of references to + * xtime (which required locks for consistency). (mikejc@us.ibm.com) + * + * TODO (not necessarily in this file): + * - improve precision and reproducibility of timebase frequency + * measurement at boot time. + * - for astronomical applications: add a new function to get + * non ambiguous timestamps even around leap seconds. This needs + * a new timestamp format and a good name. + * + * 1997-09-10 Updated NTP code according to technical memorandum Jan '96 + * "A Kernel Model for Precision Timekeeping" by Dave Mills + */ + +#include <linux/errno.h> +#include <linux/export.h> +#include <linux/sched.h> +#include <linux/sched/clock.h> +#include <linux/sched/cputime.h> +#include <linux/kernel.h> +#include <linux/param.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <linux/timex.h> +#include <linux/kernel_stat.h> +#include <linux/time.h> +#include <linux/init.h> +#include <linux/profile.h> +#include <linux/cpu.h> +#include <linux/security.h> +#include <linux/percpu.h> +#include <linux/rtc.h> +#include <linux/jiffies.h> +#include <linux/posix-timers.h> +#include <linux/irq.h> +#include <linux/delay.h> +#include <linux/irq_work.h> +#include <linux/of_clk.h> +#include <linux/suspend.h> +#include <linux/processor.h> +#include <linux/mc146818rtc.h> +#include <linux/platform_device.h> + +#include <asm/trace.h> +#include <asm/interrupt.h> +#include <asm/io.h> +#include <asm/nvram.h> +#include <asm/cache.h> +#include <asm/machdep.h> +#include <linux/uaccess.h> +#include <asm/time.h> +#include <asm/irq.h> +#include <asm/div64.h> +#include <asm/smp.h> +#include <asm/vdso_datapage.h> +#include <asm/firmware.h> +#include <asm/mce.h> + +/* powerpc clocksource/clockevent code */ + +#include <linux/clockchips.h> +#include <linux/timekeeper_internal.h> + +static u64 timebase_read(struct clocksource *); +static struct clocksource clocksource_timebase = { + .name = "timebase", + .rating = 400, + .flags = CLOCK_SOURCE_IS_CONTINUOUS, + .mask = CLOCKSOURCE_MASK(64), + .read = timebase_read, + .vdso_clock_mode = VDSO_CLOCKMODE_ARCHTIMER, +}; + +#define DECREMENTER_DEFAULT_MAX 0x7FFFFFFF +u64 decrementer_max = DECREMENTER_DEFAULT_MAX; +EXPORT_SYMBOL_GPL(decrementer_max); /* for KVM HDEC */ + +static int decrementer_set_next_event(unsigned long evt, + struct clock_event_device *dev); +static int decrementer_shutdown(struct clock_event_device *evt); + +struct clock_event_device decrementer_clockevent = { + .name = "decrementer", + .rating = 200, + .irq = 0, + .set_next_event = decrementer_set_next_event, + .set_state_oneshot_stopped = decrementer_shutdown, + .set_state_shutdown = decrementer_shutdown, + .tick_resume = decrementer_shutdown, + .features = CLOCK_EVT_FEAT_ONESHOT | + CLOCK_EVT_FEAT_C3STOP, +}; +EXPORT_SYMBOL(decrementer_clockevent); + +/* + * This always puts next_tb beyond now, so the clock event will never fire + * with the usual comparison, no need for a separate test for stopped. + */ +#define DEC_CLOCKEVENT_STOPPED ~0ULL +DEFINE_PER_CPU(u64, decrementers_next_tb) = DEC_CLOCKEVENT_STOPPED; +EXPORT_SYMBOL_GPL(decrementers_next_tb); +static DEFINE_PER_CPU(struct clock_event_device, decrementers); + +#define XSEC_PER_SEC (1024*1024) + +#ifdef CONFIG_PPC64 +#define SCALE_XSEC(xsec, max) (((xsec) * max) / XSEC_PER_SEC) +#else +/* compute ((xsec << 12) * max) >> 32 */ +#define SCALE_XSEC(xsec, max) mulhwu((xsec) << 12, max) +#endif + +unsigned long tb_ticks_per_jiffy; +unsigned long tb_ticks_per_usec = 100; /* sane default */ +EXPORT_SYMBOL(tb_ticks_per_usec); +unsigned long tb_ticks_per_sec; +EXPORT_SYMBOL(tb_ticks_per_sec); /* for cputime_t conversions */ + +DEFINE_SPINLOCK(rtc_lock); +EXPORT_SYMBOL_GPL(rtc_lock); + +static u64 tb_to_ns_scale __read_mostly; +static unsigned tb_to_ns_shift __read_mostly; +static u64 boot_tb __read_mostly; + +extern struct timezone sys_tz; +static long timezone_offset; + +unsigned long ppc_proc_freq; +EXPORT_SYMBOL_GPL(ppc_proc_freq); +unsigned long ppc_tb_freq; +EXPORT_SYMBOL_GPL(ppc_tb_freq); + +bool tb_invalid; + +#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE +/* + * Factor for converting from cputime_t (timebase ticks) to + * microseconds. This is stored as 0.64 fixed-point binary fraction. + */ +u64 __cputime_usec_factor; +EXPORT_SYMBOL(__cputime_usec_factor); + +static void calc_cputime_factors(void) +{ + struct div_result res; + + div128_by_32(1000000, 0, tb_ticks_per_sec, &res); + __cputime_usec_factor = res.result_low; +} + +/* + * Read the SPURR on systems that have it, otherwise the PURR, + * or if that doesn't exist return the timebase value passed in. + */ +static inline unsigned long read_spurr(unsigned long tb) +{ + if (cpu_has_feature(CPU_FTR_SPURR)) + return mfspr(SPRN_SPURR); + if (cpu_has_feature(CPU_FTR_PURR)) + return mfspr(SPRN_PURR); + return tb; +} + +/* + * Account time for a transition between system, hard irq + * or soft irq state. + */ +static unsigned long vtime_delta_scaled(struct cpu_accounting_data *acct, + unsigned long now, unsigned long stime) +{ + unsigned long stime_scaled = 0; +#ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME + unsigned long nowscaled, deltascaled; + unsigned long utime, utime_scaled; + + nowscaled = read_spurr(now); + deltascaled = nowscaled - acct->startspurr; + acct->startspurr = nowscaled; + utime = acct->utime - acct->utime_sspurr; + acct->utime_sspurr = acct->utime; + + /* + * Because we don't read the SPURR on every kernel entry/exit, + * deltascaled includes both user and system SPURR ticks. + * Apportion these ticks to system SPURR ticks and user + * SPURR ticks in the same ratio as the system time (delta) + * and user time (udelta) values obtained from the timebase + * over the same interval. The system ticks get accounted here; + * the user ticks get saved up in paca->user_time_scaled to be + * used by account_process_tick. + */ + stime_scaled = stime; + utime_scaled = utime; + if (deltascaled != stime + utime) { + if (utime) { + stime_scaled = deltascaled * stime / (stime + utime); + utime_scaled = deltascaled - stime_scaled; + } else { + stime_scaled = deltascaled; + } + } + acct->utime_scaled += utime_scaled; +#endif + + return stime_scaled; +} + +static unsigned long vtime_delta(struct cpu_accounting_data *acct, + unsigned long *stime_scaled, + unsigned long *steal_time) +{ + unsigned long now, stime; + + WARN_ON_ONCE(!irqs_disabled()); + + now = mftb(); + stime = now - acct->starttime; + acct->starttime = now; + + *stime_scaled = vtime_delta_scaled(acct, now, stime); + + if (IS_ENABLED(CONFIG_PPC_SPLPAR) && + firmware_has_feature(FW_FEATURE_SPLPAR)) + *steal_time = pseries_calculate_stolen_time(now); + else + *steal_time = 0; + + return stime; +} + +static void vtime_delta_kernel(struct cpu_accounting_data *acct, + unsigned long *stime, unsigned long *stime_scaled) +{ + unsigned long steal_time; + + *stime = vtime_delta(acct, stime_scaled, &steal_time); + *stime -= min(*stime, steal_time); + acct->steal_time += steal_time; +} + +void vtime_account_kernel(struct task_struct *tsk) +{ + struct cpu_accounting_data *acct = get_accounting(tsk); + unsigned long stime, stime_scaled; + + vtime_delta_kernel(acct, &stime, &stime_scaled); + + if (tsk->flags & PF_VCPU) { + acct->gtime += stime; +#ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME + acct->utime_scaled += stime_scaled; +#endif + } else { + acct->stime += stime; +#ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME + acct->stime_scaled += stime_scaled; +#endif + } +} +EXPORT_SYMBOL_GPL(vtime_account_kernel); + +void vtime_account_idle(struct task_struct *tsk) +{ + unsigned long stime, stime_scaled, steal_time; + struct cpu_accounting_data *acct = get_accounting(tsk); + + stime = vtime_delta(acct, &stime_scaled, &steal_time); + acct->idle_time += stime + steal_time; +} + +static void vtime_account_irq_field(struct cpu_accounting_data *acct, + unsigned long *field) +{ + unsigned long stime, stime_scaled; + + vtime_delta_kernel(acct, &stime, &stime_scaled); + *field += stime; +#ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME + acct->stime_scaled += stime_scaled; +#endif +} + +void vtime_account_softirq(struct task_struct *tsk) +{ + struct cpu_accounting_data *acct = get_accounting(tsk); + vtime_account_irq_field(acct, &acct->softirq_time); +} + +void vtime_account_hardirq(struct task_struct *tsk) +{ + struct cpu_accounting_data *acct = get_accounting(tsk); + vtime_account_irq_field(acct, &acct->hardirq_time); +} + +static void vtime_flush_scaled(struct task_struct *tsk, + struct cpu_accounting_data *acct) +{ +#ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME + if (acct->utime_scaled) + tsk->utimescaled += cputime_to_nsecs(acct->utime_scaled); + if (acct->stime_scaled) + tsk->stimescaled += cputime_to_nsecs(acct->stime_scaled); + + acct->utime_scaled = 0; + acct->utime_sspurr = 0; + acct->stime_scaled = 0; +#endif +} + +/* + * Account the whole cputime accumulated in the paca + * Must be called with interrupts disabled. + * Assumes that vtime_account_kernel/idle() has been called + * recently (i.e. since the last entry from usermode) so that + * get_paca()->user_time_scaled is up to date. + */ +void vtime_flush(struct task_struct *tsk) +{ + struct cpu_accounting_data *acct = get_accounting(tsk); + + if (acct->utime) + account_user_time(tsk, cputime_to_nsecs(acct->utime)); + + if (acct->gtime) + account_guest_time(tsk, cputime_to_nsecs(acct->gtime)); + + if (IS_ENABLED(CONFIG_PPC_SPLPAR) && acct->steal_time) { + account_steal_time(cputime_to_nsecs(acct->steal_time)); + acct->steal_time = 0; + } + + if (acct->idle_time) + account_idle_time(cputime_to_nsecs(acct->idle_time)); + + if (acct->stime) + account_system_index_time(tsk, cputime_to_nsecs(acct->stime), + CPUTIME_SYSTEM); + + if (acct->hardirq_time) + account_system_index_time(tsk, cputime_to_nsecs(acct->hardirq_time), + CPUTIME_IRQ); + if (acct->softirq_time) + account_system_index_time(tsk, cputime_to_nsecs(acct->softirq_time), + CPUTIME_SOFTIRQ); + + vtime_flush_scaled(tsk, acct); + + acct->utime = 0; + acct->gtime = 0; + acct->idle_time = 0; + acct->stime = 0; + acct->hardirq_time = 0; + acct->softirq_time = 0; +} + +#else /* ! CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ +#define calc_cputime_factors() +#endif + +void __no_kcsan __delay(unsigned long loops) +{ + unsigned long start; + + spin_begin(); + if (tb_invalid) { + /* + * TB is in error state and isn't ticking anymore. + * HMI handler was unable to recover from TB error. + * Return immediately, so that kernel won't get stuck here. + */ + spin_cpu_relax(); + } else { + start = mftb(); + while (mftb() - start < loops) + spin_cpu_relax(); + } + spin_end(); +} +EXPORT_SYMBOL(__delay); + +void __no_kcsan udelay(unsigned long usecs) +{ + __delay(tb_ticks_per_usec * usecs); +} +EXPORT_SYMBOL(udelay); + +#ifdef CONFIG_SMP +unsigned long profile_pc(struct pt_regs *regs) +{ + unsigned long pc = instruction_pointer(regs); + + if (in_lock_functions(pc)) + return regs->link; + + return pc; +} +EXPORT_SYMBOL(profile_pc); +#endif + +#ifdef CONFIG_IRQ_WORK + +/* + * 64-bit uses a byte in the PACA, 32-bit uses a per-cpu variable... + */ +#ifdef CONFIG_PPC64 +static inline unsigned long test_irq_work_pending(void) +{ + unsigned long x; + + asm volatile("lbz %0,%1(13)" + : "=r" (x) + : "i" (offsetof(struct paca_struct, irq_work_pending))); + return x; +} + +static inline void set_irq_work_pending_flag(void) +{ + asm volatile("stb %0,%1(13)" : : + "r" (1), + "i" (offsetof(struct paca_struct, irq_work_pending))); +} + +static inline void clear_irq_work_pending(void) +{ + asm volatile("stb %0,%1(13)" : : + "r" (0), + "i" (offsetof(struct paca_struct, irq_work_pending))); +} + +#else /* 32-bit */ + +DEFINE_PER_CPU(u8, irq_work_pending); + +#define set_irq_work_pending_flag() __this_cpu_write(irq_work_pending, 1) +#define test_irq_work_pending() __this_cpu_read(irq_work_pending) +#define clear_irq_work_pending() __this_cpu_write(irq_work_pending, 0) + +#endif /* 32 vs 64 bit */ + +void arch_irq_work_raise(void) +{ + /* + * 64-bit code that uses irq soft-mask can just cause an immediate + * interrupt here that gets soft masked, if this is called under + * local_irq_disable(). It might be possible to prevent that happening + * by noticing interrupts are disabled and setting decrementer pending + * to be replayed when irqs are enabled. The problem there is that + * tracing can call irq_work_raise, including in code that does low + * level manipulations of irq soft-mask state (e.g., trace_hardirqs_on) + * which could get tangled up if we're messing with the same state + * here. + */ + preempt_disable(); + set_irq_work_pending_flag(); + set_dec(1); + preempt_enable(); +} + +static void set_dec_or_work(u64 val) +{ + set_dec(val); + /* We may have raced with new irq work */ + if (unlikely(test_irq_work_pending())) + set_dec(1); +} + +#else /* CONFIG_IRQ_WORK */ + +#define test_irq_work_pending() 0 +#define clear_irq_work_pending() + +static void set_dec_or_work(u64 val) +{ + set_dec(val); +} +#endif /* CONFIG_IRQ_WORK */ + +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE +void timer_rearm_host_dec(u64 now) +{ + u64 *next_tb = this_cpu_ptr(&decrementers_next_tb); + + WARN_ON_ONCE(!arch_irqs_disabled()); + WARN_ON_ONCE(mfmsr() & MSR_EE); + + if (now >= *next_tb) { + local_paca->irq_happened |= PACA_IRQ_DEC; + } else { + now = *next_tb - now; + if (now > decrementer_max) + now = decrementer_max; + set_dec_or_work(now); + } +} +EXPORT_SYMBOL_GPL(timer_rearm_host_dec); +#endif + +/* + * timer_interrupt - gets called when the decrementer overflows, + * with interrupts disabled. + */ +DEFINE_INTERRUPT_HANDLER_ASYNC(timer_interrupt) +{ + struct clock_event_device *evt = this_cpu_ptr(&decrementers); + u64 *next_tb = this_cpu_ptr(&decrementers_next_tb); + struct pt_regs *old_regs; + u64 now; + + /* + * Some implementations of hotplug will get timer interrupts while + * offline, just ignore these. + */ + if (unlikely(!cpu_online(smp_processor_id()))) { + set_dec(decrementer_max); + return; + } + + /* Conditionally hard-enable interrupts. */ + if (should_hard_irq_enable(regs)) { + /* + * Ensure a positive value is written to the decrementer, or + * else some CPUs will continue to take decrementer exceptions. + * When the PPC_WATCHDOG (decrementer based) is configured, + * keep this at most 31 bits, which is about 4 seconds on most + * systems, which gives the watchdog a chance of catching timer + * interrupt hard lockups. + */ + if (IS_ENABLED(CONFIG_PPC_WATCHDOG)) + set_dec(0x7fffffff); + else + set_dec(decrementer_max); + + do_hard_irq_enable(); + } + +#if defined(CONFIG_PPC32) && defined(CONFIG_PPC_PMAC) + if (atomic_read(&ppc_n_lost_interrupts) != 0) + __do_IRQ(regs); +#endif + + old_regs = set_irq_regs(regs); + + trace_timer_interrupt_entry(regs); + + if (test_irq_work_pending()) { + clear_irq_work_pending(); + mce_run_irq_context_handlers(); + irq_work_run(); + } + + now = get_tb(); + if (now >= *next_tb) { + evt->event_handler(evt); + __this_cpu_inc(irq_stat.timer_irqs_event); + } else { + now = *next_tb - now; + if (now > decrementer_max) + now = decrementer_max; + set_dec_or_work(now); + __this_cpu_inc(irq_stat.timer_irqs_others); + } + + trace_timer_interrupt_exit(regs); + + set_irq_regs(old_regs); +} +EXPORT_SYMBOL(timer_interrupt); + +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST +void timer_broadcast_interrupt(void) +{ + tick_receive_broadcast(); + __this_cpu_inc(irq_stat.broadcast_irqs_event); +} +#endif + +#ifdef CONFIG_SUSPEND +/* Overrides the weak version in kernel/power/main.c */ +void arch_suspend_disable_irqs(void) +{ + if (ppc_md.suspend_disable_irqs) + ppc_md.suspend_disable_irqs(); + + /* Disable the decrementer, so that it doesn't interfere + * with suspending. + */ + + set_dec(decrementer_max); + local_irq_disable(); + set_dec(decrementer_max); +} + +/* Overrides the weak version in kernel/power/main.c */ +void arch_suspend_enable_irqs(void) +{ + local_irq_enable(); + + if (ppc_md.suspend_enable_irqs) + ppc_md.suspend_enable_irqs(); +} +#endif + +unsigned long long tb_to_ns(unsigned long long ticks) +{ + return mulhdu(ticks, tb_to_ns_scale) << tb_to_ns_shift; +} +EXPORT_SYMBOL_GPL(tb_to_ns); + +/* + * Scheduler clock - returns current time in nanosec units. + * + * Note: mulhdu(a, b) (multiply high double unsigned) returns + * the high 64 bits of a * b, i.e. (a * b) >> 64, where a and b + * are 64-bit unsigned numbers. + */ +notrace unsigned long long sched_clock(void) +{ + return mulhdu(get_tb() - boot_tb, tb_to_ns_scale) << tb_to_ns_shift; +} + + +#ifdef CONFIG_PPC_PSERIES + +/* + * Running clock - attempts to give a view of time passing for a virtualised + * kernels. + * Uses the VTB register if available otherwise a next best guess. + */ +unsigned long long running_clock(void) +{ + /* + * Don't read the VTB as a host since KVM does not switch in host + * timebase into the VTB when it takes a guest off the CPU, reading the + * VTB would result in reading 'last switched out' guest VTB. + * + * Host kernels are often compiled with CONFIG_PPC_PSERIES checked, it + * would be unsafe to rely only on the #ifdef above. + */ + if (firmware_has_feature(FW_FEATURE_LPAR) && + cpu_has_feature(CPU_FTR_ARCH_207S)) + return mulhdu(get_vtb() - boot_tb, tb_to_ns_scale) << tb_to_ns_shift; + + /* + * This is a next best approximation without a VTB. + * On a host which is running bare metal there should never be any stolen + * time and on a host which doesn't do any virtualisation TB *should* equal + * VTB so it makes no difference anyway. + */ + return local_clock() - kcpustat_this_cpu->cpustat[CPUTIME_STEAL]; +} +#endif + +static int __init get_freq(char *name, int cells, unsigned long *val) +{ + struct device_node *cpu; + const __be32 *fp; + int found = 0; + + /* The cpu node should have timebase and clock frequency properties */ + cpu = of_find_node_by_type(NULL, "cpu"); + + if (cpu) { + fp = of_get_property(cpu, name, NULL); + if (fp) { + found = 1; + *val = of_read_ulong(fp, cells); + } + + of_node_put(cpu); + } + + return found; +} + +static void start_cpu_decrementer(void) +{ +#ifdef CONFIG_BOOKE_OR_40x + unsigned int tcr; + + /* Clear any pending timer interrupts */ + mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS); + + tcr = mfspr(SPRN_TCR); + /* + * The watchdog may have already been enabled by u-boot. So leave + * TRC[WP] (Watchdog Period) alone. + */ + tcr &= TCR_WP_MASK; /* Clear all bits except for TCR[WP] */ + tcr |= TCR_DIE; /* Enable decrementer */ + mtspr(SPRN_TCR, tcr); +#endif +} + +void __init generic_calibrate_decr(void) +{ + ppc_tb_freq = DEFAULT_TB_FREQ; /* hardcoded default */ + + if (!get_freq("ibm,extended-timebase-frequency", 2, &ppc_tb_freq) && + !get_freq("timebase-frequency", 1, &ppc_tb_freq)) { + + printk(KERN_ERR "WARNING: Estimating decrementer frequency " + "(not found)\n"); + } + + ppc_proc_freq = DEFAULT_PROC_FREQ; /* hardcoded default */ + + if (!get_freq("ibm,extended-clock-frequency", 2, &ppc_proc_freq) && + !get_freq("clock-frequency", 1, &ppc_proc_freq)) { + + printk(KERN_ERR "WARNING: Estimating processor frequency " + "(not found)\n"); + } +} + +int update_persistent_clock64(struct timespec64 now) +{ + struct rtc_time tm; + + if (!ppc_md.set_rtc_time) + return -ENODEV; + + rtc_time64_to_tm(now.tv_sec + 1 + timezone_offset, &tm); + + return ppc_md.set_rtc_time(&tm); +} + +static void __read_persistent_clock(struct timespec64 *ts) +{ + struct rtc_time tm; + static int first = 1; + + ts->tv_nsec = 0; + /* XXX this is a little fragile but will work okay in the short term */ + if (first) { + first = 0; + if (ppc_md.time_init) + timezone_offset = ppc_md.time_init(); + + /* get_boot_time() isn't guaranteed to be safe to call late */ + if (ppc_md.get_boot_time) { + ts->tv_sec = ppc_md.get_boot_time() - timezone_offset; + return; + } + } + if (!ppc_md.get_rtc_time) { + ts->tv_sec = 0; + return; + } + ppc_md.get_rtc_time(&tm); + + ts->tv_sec = rtc_tm_to_time64(&tm); +} + +void read_persistent_clock64(struct timespec64 *ts) +{ + __read_persistent_clock(ts); + + /* Sanitize it in case real time clock is set below EPOCH */ + if (ts->tv_sec < 0) { + ts->tv_sec = 0; + ts->tv_nsec = 0; + } + +} + +/* clocksource code */ +static notrace u64 timebase_read(struct clocksource *cs) +{ + return (u64)get_tb(); +} + +static void __init clocksource_init(void) +{ + struct clocksource *clock = &clocksource_timebase; + + if (clocksource_register_hz(clock, tb_ticks_per_sec)) { + printk(KERN_ERR "clocksource: %s is already registered\n", + clock->name); + return; + } + + printk(KERN_INFO "clocksource: %s mult[%x] shift[%d] registered\n", + clock->name, clock->mult, clock->shift); +} + +static int decrementer_set_next_event(unsigned long evt, + struct clock_event_device *dev) +{ + __this_cpu_write(decrementers_next_tb, get_tb() + evt); + set_dec_or_work(evt); + + return 0; +} + +static int decrementer_shutdown(struct clock_event_device *dev) +{ + __this_cpu_write(decrementers_next_tb, DEC_CLOCKEVENT_STOPPED); + set_dec_or_work(decrementer_max); + + return 0; +} + +static void register_decrementer_clockevent(int cpu) +{ + struct clock_event_device *dec = &per_cpu(decrementers, cpu); + + *dec = decrementer_clockevent; + dec->cpumask = cpumask_of(cpu); + + clockevents_config_and_register(dec, ppc_tb_freq, 2, decrementer_max); + + printk_once(KERN_DEBUG "clockevent: %s mult[%x] shift[%d] cpu[%d]\n", + dec->name, dec->mult, dec->shift, cpu); + + /* Set values for KVM, see kvm_emulate_dec() */ + decrementer_clockevent.mult = dec->mult; + decrementer_clockevent.shift = dec->shift; +} + +static void enable_large_decrementer(void) +{ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + return; + + if (decrementer_max <= DECREMENTER_DEFAULT_MAX) + return; + + /* + * If we're running as the hypervisor we need to enable the LD manually + * otherwise firmware should have done it for us. + */ + if (cpu_has_feature(CPU_FTR_HVMODE)) + mtspr(SPRN_LPCR, mfspr(SPRN_LPCR) | LPCR_LD); +} + +static void __init set_decrementer_max(void) +{ + struct device_node *cpu; + u32 bits = 32; + + /* Prior to ISAv3 the decrementer is always 32 bit */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + return; + + cpu = of_find_node_by_type(NULL, "cpu"); + + if (of_property_read_u32(cpu, "ibm,dec-bits", &bits) == 0) { + if (bits > 64 || bits < 32) { + pr_warn("time_init: firmware supplied invalid ibm,dec-bits"); + bits = 32; + } + + /* calculate the signed maximum given this many bits */ + decrementer_max = (1ul << (bits - 1)) - 1; + } + + of_node_put(cpu); + + pr_info("time_init: %u bit decrementer (max: %llx)\n", + bits, decrementer_max); +} + +static void __init init_decrementer_clockevent(void) +{ + register_decrementer_clockevent(smp_processor_id()); +} + +void secondary_cpu_time_init(void) +{ + /* Enable and test the large decrementer for this cpu */ + enable_large_decrementer(); + + /* Start the decrementer on CPUs that have manual control + * such as BookE + */ + start_cpu_decrementer(); + + /* FIME: Should make unrelated change to move snapshot_timebase + * call here ! */ + register_decrementer_clockevent(smp_processor_id()); +} + +/* This function is only called on the boot processor */ +void __init time_init(void) +{ + struct div_result res; + u64 scale; + unsigned shift; + + /* Normal PowerPC with timebase register */ + ppc_md.calibrate_decr(); + printk(KERN_DEBUG "time_init: decrementer frequency = %lu.%.6lu MHz\n", + ppc_tb_freq / 1000000, ppc_tb_freq % 1000000); + printk(KERN_DEBUG "time_init: processor frequency = %lu.%.6lu MHz\n", + ppc_proc_freq / 1000000, ppc_proc_freq % 1000000); + + tb_ticks_per_jiffy = ppc_tb_freq / HZ; + tb_ticks_per_sec = ppc_tb_freq; + tb_ticks_per_usec = ppc_tb_freq / 1000000; + calc_cputime_factors(); + + /* + * Compute scale factor for sched_clock. + * The calibrate_decr() function has set tb_ticks_per_sec, + * which is the timebase frequency. + * We compute 1e9 * 2^64 / tb_ticks_per_sec and interpret + * the 128-bit result as a 64.64 fixed-point number. + * We then shift that number right until it is less than 1.0, + * giving us the scale factor and shift count to use in + * sched_clock(). + */ + div128_by_32(1000000000, 0, tb_ticks_per_sec, &res); + scale = res.result_low; + for (shift = 0; res.result_high != 0; ++shift) { + scale = (scale >> 1) | (res.result_high << 63); + res.result_high >>= 1; + } + tb_to_ns_scale = scale; + tb_to_ns_shift = shift; + /* Save the current timebase to pretty up CONFIG_PRINTK_TIME */ + boot_tb = get_tb(); + + /* If platform provided a timezone (pmac), we correct the time */ + if (timezone_offset) { + sys_tz.tz_minuteswest = -timezone_offset / 60; + sys_tz.tz_dsttime = 0; + } + + vdso_data->tb_ticks_per_sec = tb_ticks_per_sec; + + /* initialise and enable the large decrementer (if we have one) */ + set_decrementer_max(); + enable_large_decrementer(); + + /* Start the decrementer on CPUs that have manual control + * such as BookE + */ + start_cpu_decrementer(); + + /* Register the clocksource */ + clocksource_init(); + + init_decrementer_clockevent(); + tick_setup_hrtimer_broadcast(); + + of_clk_init(NULL); + enable_sched_clock_irqtime(); +} + +/* + * Divide a 128-bit dividend by a 32-bit divisor, leaving a 128 bit + * result. + */ +void div128_by_32(u64 dividend_high, u64 dividend_low, + unsigned divisor, struct div_result *dr) +{ + unsigned long a, b, c, d; + unsigned long w, x, y, z; + u64 ra, rb, rc; + + a = dividend_high >> 32; + b = dividend_high & 0xffffffff; + c = dividend_low >> 32; + d = dividend_low & 0xffffffff; + + w = a / divisor; + ra = ((u64)(a - (w * divisor)) << 32) + b; + + rb = ((u64) do_div(ra, divisor) << 32) + c; + x = ra; + + rc = ((u64) do_div(rb, divisor) << 32) + d; + y = rb; + + do_div(rc, divisor); + z = rc; + + dr->result_high = ((u64)w << 32) + x; + dr->result_low = ((u64)y << 32) + z; + +} + +/* We don't need to calibrate delay, we use the CPU timebase for that */ +void calibrate_delay(void) +{ + /* Some generic code (such as spinlock debug) use loops_per_jiffy + * as the number of __delay(1) in a jiffy, so make it so + */ + loops_per_jiffy = tb_ticks_per_jiffy; +} + +#if IS_ENABLED(CONFIG_RTC_DRV_GENERIC) +static int rtc_generic_get_time(struct device *dev, struct rtc_time *tm) +{ + ppc_md.get_rtc_time(tm); + return 0; +} + +static int rtc_generic_set_time(struct device *dev, struct rtc_time *tm) +{ + if (!ppc_md.set_rtc_time) + return -EOPNOTSUPP; + + if (ppc_md.set_rtc_time(tm) < 0) + return -EOPNOTSUPP; + + return 0; +} + +static const struct rtc_class_ops rtc_generic_ops = { + .read_time = rtc_generic_get_time, + .set_time = rtc_generic_set_time, +}; + +static int __init rtc_init(void) +{ + struct platform_device *pdev; + + if (!ppc_md.get_rtc_time) + return -ENODEV; + + pdev = platform_device_register_data(NULL, "rtc-generic", -1, + &rtc_generic_ops, + sizeof(rtc_generic_ops)); + + return PTR_ERR_OR_ZERO(pdev); +} + +device_initcall(rtc_init); +#endif diff --git a/arch/powerpc/kernel/tm.S b/arch/powerpc/kernel/tm.S new file mode 100644 index 000000000..5a0f023a2 --- /dev/null +++ b/arch/powerpc/kernel/tm.S @@ -0,0 +1,554 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Transactional memory support routines to reclaim and recheckpoint + * transactional process state. + * + * Copyright 2012 Matt Evans & Michael Neuling, IBM Corporation. + */ + +#include <asm/asm-offsets.h> +#include <asm/ppc_asm.h> +#include <asm/ppc-opcode.h> +#include <asm/ptrace.h> +#include <asm/reg.h> +#include <asm/bug.h> +#include <asm/export.h> +#include <asm/feature-fixups.h> + +#ifdef CONFIG_VSX +/* See fpu.S, this is borrowed from there */ +#define __SAVE_32FPRS_VSRS(n,c,base) \ +BEGIN_FTR_SECTION \ + b 2f; \ +END_FTR_SECTION_IFSET(CPU_FTR_VSX); \ + SAVE_32FPRS(n,base); \ + b 3f; \ +2: SAVE_32VSRS(n,c,base); \ +3: +#define __REST_32FPRS_VSRS(n,c,base) \ +BEGIN_FTR_SECTION \ + b 2f; \ +END_FTR_SECTION_IFSET(CPU_FTR_VSX); \ + REST_32FPRS(n,base); \ + b 3f; \ +2: REST_32VSRS(n,c,base); \ +3: +#else +#define __SAVE_32FPRS_VSRS(n,c,base) SAVE_32FPRS(n, base) +#define __REST_32FPRS_VSRS(n,c,base) REST_32FPRS(n, base) +#endif +#define SAVE_32FPRS_VSRS(n,c,base) \ + __SAVE_32FPRS_VSRS(n,__REG_##c,__REG_##base) +#define REST_32FPRS_VSRS(n,c,base) \ + __REST_32FPRS_VSRS(n,__REG_##c,__REG_##base) + +/* Stack frame offsets for local variables. */ +#define TM_FRAME_L0 TM_FRAME_SIZE-16 +#define TM_FRAME_L1 TM_FRAME_SIZE-8 + + +/* In order to access the TM SPRs, TM must be enabled. So, do so: */ +_GLOBAL(tm_enable) + mfmsr r4 + li r3, MSR_TM >> 32 + sldi r3, r3, 32 + and. r0, r4, r3 + bne 1f + or r4, r4, r3 + mtmsrd r4 +1: blr +EXPORT_SYMBOL_GPL(tm_enable); + +_GLOBAL(tm_disable) + mfmsr r4 + li r3, MSR_TM >> 32 + sldi r3, r3, 32 + andc r4, r4, r3 + mtmsrd r4 + blr +EXPORT_SYMBOL_GPL(tm_disable); + +_GLOBAL(tm_save_sprs) + mfspr r0, SPRN_TFHAR + std r0, THREAD_TM_TFHAR(r3) + mfspr r0, SPRN_TEXASR + std r0, THREAD_TM_TEXASR(r3) + mfspr r0, SPRN_TFIAR + std r0, THREAD_TM_TFIAR(r3) + blr + +_GLOBAL(tm_restore_sprs) + ld r0, THREAD_TM_TFHAR(r3) + mtspr SPRN_TFHAR, r0 + ld r0, THREAD_TM_TEXASR(r3) + mtspr SPRN_TEXASR, r0 + ld r0, THREAD_TM_TFIAR(r3) + mtspr SPRN_TFIAR, r0 + blr + + /* Passed an 8-bit failure cause as first argument. */ +_GLOBAL(tm_abort) + TABORT(R3) + blr +EXPORT_SYMBOL_GPL(tm_abort); + +/* + * void tm_reclaim(struct thread_struct *thread, + * uint8_t cause) + * + * - Performs a full reclaim. This destroys outstanding + * transactions and updates thread.ckpt_regs, thread.ckfp_state and + * thread.ckvr_state with the original checkpointed state. Note that + * thread->regs is unchanged. + * + * Purpose is to both abort transactions of, and preserve the state of, + * a transactions at a context switch. We preserve/restore both sets of process + * state to restore them when the thread's scheduled again. We continue in + * userland as though nothing happened, but when the transaction is resumed + * they will abort back to the checkpointed state we save out here. + * + * Call with IRQs off, stacks get all out of sync for some periods in here! + */ +_GLOBAL(tm_reclaim) + mfcr r5 + mflr r0 + stw r5, 8(r1) + std r0, 16(r1) + std r2, STK_GOT(r1) + stdu r1, -TM_FRAME_SIZE(r1) + + /* We've a struct pt_regs at [r1+STACK_FRAME_OVERHEAD]. */ + + std r3, STK_PARAM(R3)(r1) + SAVE_NVGPRS(r1) + + /* + * Save kernel live AMR since it will be clobbered by treclaim + * but can be used elsewhere later in kernel space. + */ + mfspr r3, SPRN_AMR + std r3, TM_FRAME_L1(r1) + + /* We need to setup MSR for VSX register save instructions. */ + mfmsr r14 + mr r15, r14 + ori r15, r15, MSR_FP + li r16, 0 + ori r16, r16, MSR_EE /* IRQs hard off */ + andc r15, r15, r16 + oris r15, r15, MSR_VEC@h +#ifdef CONFIG_VSX + BEGIN_FTR_SECTION + oris r15,r15, MSR_VSX@h + END_FTR_SECTION_IFSET(CPU_FTR_VSX) +#endif + mtmsrd r15 + std r14, TM_FRAME_L0(r1) + + /* Do sanity check on MSR to make sure we are suspended */ + li r7, (MSR_TS_S)@higher + srdi r6, r14, 32 + and r6, r6, r7 +1: tdeqi r6, 0 + EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0 + + /* Stash the stack pointer away for use after reclaim */ + std r1, PACAR1(r13) + + /* Clear MSR RI since we are about to use SCRATCH0, EE is already off */ + li r5, 0 + mtmsrd r5, 1 + + /* + * BE CAREFUL HERE: + * At this point we can't take an SLB miss since we have MSR_RI + * off. Load only to/from the stack/paca which are in SLB bolted regions + * until we turn MSR RI back on. + * + * The moment we treclaim, ALL of our GPRs will switch + * to user register state. (FPRs, CCR etc. also!) + * Use an sprg and a tm_scratch in the PACA to shuffle. + */ + TRECLAIM(R4) /* Cause in r4 */ + + /* + * ******************** GPRs ******************** + * Stash the checkpointed r13 in the scratch SPR and get the real paca. + */ + SET_SCRATCH0(r13) + GET_PACA(r13) + + /* + * Stash the checkpointed r1 away in paca->tm_scratch and get the real + * stack pointer back into r1. + */ + std r1, PACATMSCRATCH(r13) + ld r1, PACAR1(r13) + + std r11, GPR11(r1) /* Temporary stash */ + + /* + * Move the saved user r1 to the kernel stack in case PACATMSCRATCH is + * clobbered by an exception once we turn on MSR_RI below. + */ + ld r11, PACATMSCRATCH(r13) + std r11, GPR1(r1) + + /* + * Store r13 away so we can free up the scratch SPR for the SLB fault + * handler (needed once we start accessing the thread_struct). + */ + GET_SCRATCH0(r11) + std r11, GPR13(r1) + + /* Reset MSR RI so we can take SLB faults again */ + li r11, MSR_RI + mtmsrd r11, 1 + + /* Store the PPR in r11 and reset to decent value */ + mfspr r11, SPRN_PPR + HMT_MEDIUM + + /* Now get some more GPRS free */ + std r7, GPR7(r1) /* Temporary stash */ + std r12, GPR12(r1) /* '' '' '' */ + ld r12, STK_PARAM(R3)(r1) /* Param 0, thread_struct * */ + + std r11, THREAD_TM_PPR(r12) /* Store PPR and free r11 */ + + addi r7, r12, PT_CKPT_REGS /* Thread's ckpt_regs */ + + /* + * Make r7 look like an exception frame so that we can use the neat + * GPRx(n) macros. r7 is NOT a pt_regs ptr! + */ + subi r7, r7, STACK_FRAME_OVERHEAD + + /* Sync the userland GPRs 2-12, 14-31 to thread->regs: */ + SAVE_GPR(0, r7) /* user r0 */ + SAVE_GPRS(2, 6, r7) /* user r2-r6 */ + SAVE_GPRS(8, 10, r7) /* user r8-r10 */ + ld r3, GPR1(r1) /* user r1 */ + ld r4, GPR7(r1) /* user r7 */ + ld r5, GPR11(r1) /* user r11 */ + ld r6, GPR12(r1) /* user r12 */ + ld r8, GPR13(r1) /* user r13 */ + std r3, GPR1(r7) + std r4, GPR7(r7) + std r5, GPR11(r7) + std r6, GPR12(r7) + std r8, GPR13(r7) + + SAVE_NVGPRS(r7) /* user r14-r31 */ + + /* ******************** NIP ******************** */ + mfspr r3, SPRN_TFHAR + std r3, _NIP(r7) /* Returns to failhandler */ + /* + * The checkpointed NIP is ignored when rescheduling/rechkpting, + * but is used in signal return to 'wind back' to the abort handler. + */ + + /* ***************** CTR, LR, CR, XER ********** */ + mfctr r3 + mflr r4 + mfcr r5 + mfxer r6 + + std r3, _CTR(r7) + std r4, _LINK(r7) + std r5, _CCR(r7) + std r6, _XER(r7) + + /* ******************** TAR, DSCR ********** */ + mfspr r3, SPRN_TAR + mfspr r4, SPRN_DSCR + + std r3, THREAD_TM_TAR(r12) + std r4, THREAD_TM_DSCR(r12) + + /* ******************** AMR **************** */ + mfspr r3, SPRN_AMR + std r3, THREAD_TM_AMR(r12) + + /* + * MSR and flags: We don't change CRs, and we don't need to alter MSR. + */ + + + /* + * ******************** FPR/VR/VSRs ************ + * After reclaiming, capture the checkpointed FPRs/VRs. + * + * We enabled VEC/FP/VSX in the msr above, so we can execute these + * instructions! + */ + mr r3, r12 + + /* Altivec (VEC/VMX/VR)*/ + addi r7, r3, THREAD_CKVRSTATE + SAVE_32VRS(0, r6, r7) /* r6 scratch, r7 ckvr_state */ + mfvscr v0 + li r6, VRSTATE_VSCR + stvx v0, r7, r6 + + /* VRSAVE */ + mfspr r0, SPRN_VRSAVE + std r0, THREAD_CKVRSAVE(r3) + + /* Floating Point (FP) */ + addi r7, r3, THREAD_CKFPSTATE + SAVE_32FPRS_VSRS(0, R6, R7) /* r6 scratch, r7 ckfp_state */ + mffs fr0 + stfd fr0,FPSTATE_FPSCR(r7) + + + /* + * TM regs, incl TEXASR -- these live in thread_struct. Note they've + * been updated by the treclaim, to explain to userland the failure + * cause (aborted). + */ + mfspr r0, SPRN_TEXASR + mfspr r3, SPRN_TFHAR + mfspr r4, SPRN_TFIAR + std r0, THREAD_TM_TEXASR(r12) + std r3, THREAD_TM_TFHAR(r12) + std r4, THREAD_TM_TFIAR(r12) + + /* Restore kernel live AMR */ + ld r8, TM_FRAME_L1(r1) + mtspr SPRN_AMR, r8 + + /* Restore original MSR/IRQ state & clear TM mode */ + ld r14, TM_FRAME_L0(r1) /* Orig MSR */ + + li r15, 0 + rldimi r14, r15, MSR_TS_LG, (63-MSR_TS_LG)-1 + mtmsrd r14 + + REST_NVGPRS(r1) + + addi r1, r1, TM_FRAME_SIZE + lwz r4, 8(r1) + ld r0, 16(r1) + mtcr r4 + mtlr r0 + ld r2, STK_GOT(r1) + + /* Load CPU's default DSCR */ + ld r0, PACA_DSCR_DEFAULT(r13) + mtspr SPRN_DSCR, r0 + + blr + + + /* + * void __tm_recheckpoint(struct thread_struct *thread) + * - Restore the checkpointed register state saved by tm_reclaim + * when we switch_to a process. + * + * Call with IRQs off, stacks get all out of sync for + * some periods in here! + */ +_GLOBAL(__tm_recheckpoint) + mfcr r5 + mflr r0 + stw r5, 8(r1) + std r0, 16(r1) + std r2, STK_GOT(r1) + stdu r1, -TM_FRAME_SIZE(r1) + + /* + * We've a struct pt_regs at [r1+STACK_FRAME_OVERHEAD]. + * This is used for backing up the NVGPRs: + */ + SAVE_NVGPRS(r1) + + /* + * Save kernel live AMR since it will be clobbered for trechkpt + * but can be used elsewhere later in kernel space. + */ + mfspr r8, SPRN_AMR + std r8, TM_FRAME_L0(r1) + + /* Load complete register state from ts_ckpt* registers */ + + addi r7, r3, PT_CKPT_REGS /* Thread's ckpt_regs */ + + /* + * Make r7 look like an exception frame so that we can use the neat + * GPRx(n) macros. r7 is now NOT a pt_regs ptr! + */ + subi r7, r7, STACK_FRAME_OVERHEAD + + /* We need to setup MSR for FP/VMX/VSX register save instructions. */ + mfmsr r6 + mr r5, r6 + ori r5, r5, MSR_FP +#ifdef CONFIG_ALTIVEC + oris r5, r5, MSR_VEC@h +#endif +#ifdef CONFIG_VSX + BEGIN_FTR_SECTION + oris r5,r5, MSR_VSX@h + END_FTR_SECTION_IFSET(CPU_FTR_VSX) +#endif + mtmsrd r5 + +#ifdef CONFIG_ALTIVEC + /* + * FP and VEC registers: These are recheckpointed from + * thread.ckfp_state and thread.ckvr_state respectively. The + * thread.fp_state[] version holds the 'live' (transactional) + * and will be loaded subsequently by any FPUnavailable trap. + */ + addi r8, r3, THREAD_CKVRSTATE + li r5, VRSTATE_VSCR + lvx v0, r8, r5 + mtvscr v0 + REST_32VRS(0, r5, r8) /* r5 scratch, r8 ptr */ + ld r5, THREAD_CKVRSAVE(r3) + mtspr SPRN_VRSAVE, r5 +#endif + + addi r8, r3, THREAD_CKFPSTATE + lfd fr0, FPSTATE_FPSCR(r8) + MTFSF_L(fr0) + REST_32FPRS_VSRS(0, R4, R8) + + mtmsr r6 /* FP/Vec off again! */ + +restore_gprs: + + /* ****************** CTR, LR, XER ************* */ + ld r4, _CTR(r7) + ld r5, _LINK(r7) + ld r8, _XER(r7) + + mtctr r4 + mtlr r5 + mtxer r8 + + /* ******************** TAR ******************** */ + ld r4, THREAD_TM_TAR(r3) + mtspr SPRN_TAR, r4 + + /* ******************** AMR ******************** */ + ld r4, THREAD_TM_AMR(r3) + mtspr SPRN_AMR, r4 + + /* Load up the PPR and DSCR in GPRs only at this stage */ + ld r5, THREAD_TM_DSCR(r3) + ld r6, THREAD_TM_PPR(r3) + + REST_GPR(0, r7) /* GPR0 */ + REST_GPRS(2, 4, r7) /* GPR2-4 */ + REST_GPRS(8, 12, r7) /* GPR8-12 */ + REST_GPRS(14, 31, r7) /* GPR14-31 */ + + /* Load up PPR and DSCR here so we don't run with user values for long */ + mtspr SPRN_DSCR, r5 + mtspr SPRN_PPR, r6 + + /* + * Do final sanity check on TEXASR to make sure FS is set. Do this + * here before we load up the userspace r1 so any bugs we hit will get + * a call chain. + */ + mfspr r5, SPRN_TEXASR + srdi r5, r5, 16 + li r6, (TEXASR_FS)@h + and r6, r6, r5 +1: tdeqi r6, 0 + EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0 + + /* + * Do final sanity check on MSR to make sure we are not transactional + * or suspended. + */ + mfmsr r6 + li r5, (MSR_TS_MASK)@higher + srdi r6, r6, 32 + and r6, r6, r5 +1: tdnei r6, 0 + EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0 + + /* Restore CR */ + ld r6, _CCR(r7) + mtcr r6 + + REST_GPR(6, r7) + + /* + * Store user r1 and r5 and r13 on the stack (in the unused save + * areas / compiler reserved areas), so that we can access them after + * we clear MSR RI. + */ + + REST_GPR(5, r7) + std r5, -8(r1) + ld r5, GPR13(r7) + std r5, -16(r1) + ld r5, GPR1(r7) + std r5, -24(r1) + + REST_GPR(7, r7) + + /* Stash the stack pointer away for use after recheckpoint */ + std r1, PACAR1(r13) + + /* Clear MSR RI since we are about to clobber r13. EE is already off */ + li r5, 0 + mtmsrd r5, 1 + + /* + * BE CAREFUL HERE: + * At this point we can't take an SLB miss since we have MSR_RI + * off. Load only to/from the stack/paca which are in SLB bolted regions + * until we turn MSR RI back on. + */ + + ld r5, -8(r1) + ld r13, -16(r1) + ld r1, -24(r1) + + /* Commit register state as checkpointed state: */ + TRECHKPT + + HMT_MEDIUM + + /* + * Our transactional state has now changed. + * + * Now just get out of here. Transactional (current) state will be + * updated once restore is called on the return path in the _switch-ed + * -to process. + */ + + GET_PACA(r13) + ld r1, PACAR1(r13) + + /* R13, R1 is restored, so we are recoverable again. EE is still off */ + li r4, MSR_RI + mtmsrd r4, 1 + + /* Restore kernel live AMR */ + ld r8, TM_FRAME_L0(r1) + mtspr SPRN_AMR, r8 + + REST_NVGPRS(r1) + + addi r1, r1, TM_FRAME_SIZE + lwz r4, 8(r1) + ld r0, 16(r1) + mtcr r4 + mtlr r0 + ld r2, STK_GOT(r1) + + /* Load CPU's default DSCR */ + ld r0, PACA_DSCR_DEFAULT(r13) + mtspr SPRN_DSCR, r0 + + blr + + /* ****************************************************************** */ diff --git a/arch/powerpc/kernel/trace/Makefile b/arch/powerpc/kernel/trace/Makefile new file mode 100644 index 000000000..af8527538 --- /dev/null +++ b/arch/powerpc/kernel/trace/Makefile @@ -0,0 +1,26 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for the powerpc trace subsystem +# + +ifdef CONFIG_FUNCTION_TRACER +# do not trace tracer code +CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE) +endif + +obj32-$(CONFIG_FUNCTION_TRACER) += ftrace_mprofile.o +ifdef CONFIG_MPROFILE_KERNEL +obj64-$(CONFIG_FUNCTION_TRACER) += ftrace_mprofile.o +else +obj64-$(CONFIG_FUNCTION_TRACER) += ftrace_64_pg.o +endif +obj-$(CONFIG_FUNCTION_TRACER) += ftrace_low.o ftrace.o +obj-$(CONFIG_TRACING) += trace_clock.o + +obj-$(CONFIG_PPC64) += $(obj64-y) +obj-$(CONFIG_PPC32) += $(obj32-y) + +# Disable GCOV, KCOV & sanitizers in odd or sensitive code +GCOV_PROFILE_ftrace.o := n +KCOV_INSTRUMENT_ftrace.o := n +UBSAN_SANITIZE_ftrace.o := n diff --git a/arch/powerpc/kernel/trace/ftrace.c b/arch/powerpc/kernel/trace/ftrace.c new file mode 100644 index 000000000..7b85c3b46 --- /dev/null +++ b/arch/powerpc/kernel/trace/ftrace.c @@ -0,0 +1,846 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Code for replacing ftrace calls with jumps. + * + * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> + * + * Thanks goes out to P.A. Semi, Inc for supplying me with a PPC64 box. + * + * Added function graph tracer code, taken from x86 that was written + * by Frederic Weisbecker, and ported to PPC by Steven Rostedt. + * + */ + +#define pr_fmt(fmt) "ftrace-powerpc: " fmt + +#include <linux/spinlock.h> +#include <linux/hardirq.h> +#include <linux/uaccess.h> +#include <linux/module.h> +#include <linux/ftrace.h> +#include <linux/percpu.h> +#include <linux/init.h> +#include <linux/list.h> + +#include <asm/cacheflush.h> +#include <asm/code-patching.h> +#include <asm/ftrace.h> +#include <asm/syscall.h> +#include <asm/inst.h> + +/* + * We generally only have a single long_branch tramp and at most 2 or 3 plt + * tramps generated. But, we don't use the plt tramps currently. We also allot + * 2 tramps after .text and .init.text. So, we only end up with around 3 usable + * tramps in total. Set aside 8 just to be sure. + */ +#define NUM_FTRACE_TRAMPS 8 +static unsigned long ftrace_tramps[NUM_FTRACE_TRAMPS]; + +static ppc_inst_t +ftrace_call_replace(unsigned long ip, unsigned long addr, int link) +{ + ppc_inst_t op; + + addr = ppc_function_entry((void *)addr); + + /* if (link) set op to 'bl' else 'b' */ + create_branch(&op, (u32 *)ip, addr, link ? BRANCH_SET_LINK : 0); + + return op; +} + +static inline int +ftrace_modify_code(unsigned long ip, ppc_inst_t old, ppc_inst_t new) +{ + ppc_inst_t replaced; + + /* + * Note: + * We are paranoid about modifying text, as if a bug was to happen, it + * could cause us to read or write to someplace that could cause harm. + * Carefully read and modify the code with probe_kernel_*(), and make + * sure what we read is what we expected it to be before modifying it. + */ + + /* read the text we want to modify */ + if (copy_inst_from_kernel_nofault(&replaced, (void *)ip)) + return -EFAULT; + + /* Make sure it is what we expect it to be */ + if (!ppc_inst_equal(replaced, old)) { + pr_err("%p: replaced (%08lx) != old (%08lx)", (void *)ip, + ppc_inst_as_ulong(replaced), ppc_inst_as_ulong(old)); + return -EINVAL; + } + + /* replace the text with the new text */ + return patch_instruction((u32 *)ip, new); +} + +/* + * Helper functions that are the same for both PPC64 and PPC32. + */ +static int test_24bit_addr(unsigned long ip, unsigned long addr) +{ + addr = ppc_function_entry((void *)addr); + + return is_offset_in_branch_range(addr - ip); +} + +static int is_bl_op(ppc_inst_t op) +{ + return (ppc_inst_val(op) & ~PPC_LI_MASK) == PPC_RAW_BL(0); +} + +static int is_b_op(ppc_inst_t op) +{ + return (ppc_inst_val(op) & ~PPC_LI_MASK) == PPC_RAW_BRANCH(0); +} + +static unsigned long find_bl_target(unsigned long ip, ppc_inst_t op) +{ + int offset; + + offset = PPC_LI(ppc_inst_val(op)); + /* make it signed */ + if (offset & 0x02000000) + offset |= 0xfe000000; + + return ip + (long)offset; +} + +#ifdef CONFIG_MODULES +static int +__ftrace_make_nop(struct module *mod, + struct dyn_ftrace *rec, unsigned long addr) +{ + unsigned long entry, ptr, tramp; + unsigned long ip = rec->ip; + ppc_inst_t op, pop; + + /* read where this goes */ + if (copy_inst_from_kernel_nofault(&op, (void *)ip)) { + pr_err("Fetching opcode failed.\n"); + return -EFAULT; + } + + /* Make sure that this is still a 24bit jump */ + if (!is_bl_op(op)) { + pr_err("Not expected bl: opcode is %08lx\n", ppc_inst_as_ulong(op)); + return -EINVAL; + } + + /* lets find where the pointer goes */ + tramp = find_bl_target(ip, op); + + pr_devel("ip:%lx jumps to %lx", ip, tramp); + + if (module_trampoline_target(mod, tramp, &ptr)) { + pr_err("Failed to get trampoline target\n"); + return -EFAULT; + } + + pr_devel("trampoline target %lx", ptr); + + entry = ppc_global_function_entry((void *)addr); + /* This should match what was called */ + if (ptr != entry) { + pr_err("addr %lx does not match expected %lx\n", ptr, entry); + return -EINVAL; + } + + if (IS_ENABLED(CONFIG_MPROFILE_KERNEL)) { + if (copy_inst_from_kernel_nofault(&op, (void *)(ip - 4))) { + pr_err("Fetching instruction at %lx failed.\n", ip - 4); + return -EFAULT; + } + + /* We expect either a mflr r0, or a std r0, LRSAVE(r1) */ + if (!ppc_inst_equal(op, ppc_inst(PPC_RAW_MFLR(_R0))) && + !ppc_inst_equal(op, ppc_inst(PPC_INST_STD_LR))) { + pr_err("Unexpected instruction %08lx around bl _mcount\n", + ppc_inst_as_ulong(op)); + return -EINVAL; + } + } else if (IS_ENABLED(CONFIG_PPC64)) { + /* + * Check what is in the next instruction. We can see ld r2,40(r1), but + * on first pass after boot we will see mflr r0. + */ + if (copy_inst_from_kernel_nofault(&op, (void *)(ip + 4))) { + pr_err("Fetching op failed.\n"); + return -EFAULT; + } + + if (!ppc_inst_equal(op, ppc_inst(PPC_INST_LD_TOC))) { + pr_err("Expected %08lx found %08lx\n", PPC_INST_LD_TOC, + ppc_inst_as_ulong(op)); + return -EINVAL; + } + } + + /* + * When using -mprofile-kernel or PPC32 there is no load to jump over. + * + * Otherwise our original call site looks like: + * + * bl <tramp> + * ld r2,XX(r1) + * + * Milton Miller pointed out that we can not simply nop the branch. + * If a task was preempted when calling a trace function, the nops + * will remove the way to restore the TOC in r2 and the r2 TOC will + * get corrupted. + * + * Use a b +8 to jump over the load. + */ + if (IS_ENABLED(CONFIG_MPROFILE_KERNEL) || IS_ENABLED(CONFIG_PPC32)) + pop = ppc_inst(PPC_RAW_NOP()); + else + pop = ppc_inst(PPC_RAW_BRANCH(8)); /* b +8 */ + + if (patch_instruction((u32 *)ip, pop)) { + pr_err("Patching NOP failed.\n"); + return -EPERM; + } + + return 0; +} +#else +static int __ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec, unsigned long addr) +{ + return 0; +} +#endif /* CONFIG_MODULES */ + +static unsigned long find_ftrace_tramp(unsigned long ip) +{ + int i; + + /* + * We have the compiler generated long_branch tramps at the end + * and we prefer those + */ + for (i = NUM_FTRACE_TRAMPS - 1; i >= 0; i--) + if (!ftrace_tramps[i]) + continue; + else if (is_offset_in_branch_range(ftrace_tramps[i] - ip)) + return ftrace_tramps[i]; + + return 0; +} + +static int add_ftrace_tramp(unsigned long tramp) +{ + int i; + + for (i = 0; i < NUM_FTRACE_TRAMPS; i++) + if (!ftrace_tramps[i]) { + ftrace_tramps[i] = tramp; + return 0; + } + + return -1; +} + +/* + * If this is a compiler generated long_branch trampoline (essentially, a + * trampoline that has a branch to _mcount()), we re-write the branch to + * instead go to ftrace_[regs_]caller() and note down the location of this + * trampoline. + */ +static int setup_mcount_compiler_tramp(unsigned long tramp) +{ + int i; + ppc_inst_t op; + unsigned long ptr; + + /* Is this a known long jump tramp? */ + for (i = 0; i < NUM_FTRACE_TRAMPS; i++) + if (ftrace_tramps[i] == tramp) + return 0; + + /* New trampoline -- read where this goes */ + if (copy_inst_from_kernel_nofault(&op, (void *)tramp)) { + pr_debug("Fetching opcode failed.\n"); + return -1; + } + + /* Is this a 24 bit branch? */ + if (!is_b_op(op)) { + pr_debug("Trampoline is not a long branch tramp.\n"); + return -1; + } + + /* lets find where the pointer goes */ + ptr = find_bl_target(tramp, op); + + if (ptr != ppc_global_function_entry((void *)_mcount)) { + pr_debug("Trampoline target %p is not _mcount\n", (void *)ptr); + return -1; + } + + /* Let's re-write the tramp to go to ftrace_[regs_]caller */ + if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS)) + ptr = ppc_global_function_entry((void *)ftrace_regs_caller); + else + ptr = ppc_global_function_entry((void *)ftrace_caller); + + if (patch_branch((u32 *)tramp, ptr, 0)) { + pr_debug("REL24 out of range!\n"); + return -1; + } + + if (add_ftrace_tramp(tramp)) { + pr_debug("No tramp locations left\n"); + return -1; + } + + return 0; +} + +static int __ftrace_make_nop_kernel(struct dyn_ftrace *rec, unsigned long addr) +{ + unsigned long tramp, ip = rec->ip; + ppc_inst_t op; + + /* Read where this goes */ + if (copy_inst_from_kernel_nofault(&op, (void *)ip)) { + pr_err("Fetching opcode failed.\n"); + return -EFAULT; + } + + /* Make sure that this is still a 24bit jump */ + if (!is_bl_op(op)) { + pr_err("Not expected bl: opcode is %08lx\n", ppc_inst_as_ulong(op)); + return -EINVAL; + } + + /* Let's find where the pointer goes */ + tramp = find_bl_target(ip, op); + + pr_devel("ip:%lx jumps to %lx", ip, tramp); + + if (setup_mcount_compiler_tramp(tramp)) { + /* Are other trampolines reachable? */ + if (!find_ftrace_tramp(ip)) { + pr_err("No ftrace trampolines reachable from %ps\n", + (void *)ip); + return -EINVAL; + } + } + + if (patch_instruction((u32 *)ip, ppc_inst(PPC_RAW_NOP()))) { + pr_err("Patching NOP failed.\n"); + return -EPERM; + } + + return 0; +} + +int ftrace_make_nop(struct module *mod, + struct dyn_ftrace *rec, unsigned long addr) +{ + unsigned long ip = rec->ip; + ppc_inst_t old, new; + + /* + * If the calling address is more that 24 bits away, + * then we had to use a trampoline to make the call. + * Otherwise just update the call site. + */ + if (test_24bit_addr(ip, addr)) { + /* within range */ + old = ftrace_call_replace(ip, addr, 1); + new = ppc_inst(PPC_RAW_NOP()); + return ftrace_modify_code(ip, old, new); + } else if (core_kernel_text(ip)) { + return __ftrace_make_nop_kernel(rec, addr); + } else if (!IS_ENABLED(CONFIG_MODULES)) { + return -EINVAL; + } + + /* + * Out of range jumps are called from modules. + * We should either already have a pointer to the module + * or it has been passed in. + */ + if (!rec->arch.mod) { + if (!mod) { + pr_err("No module loaded addr=%lx\n", addr); + return -EFAULT; + } + rec->arch.mod = mod; + } else if (mod) { + if (mod != rec->arch.mod) { + pr_err("Record mod %p not equal to passed in mod %p\n", + rec->arch.mod, mod); + return -EINVAL; + } + /* nothing to do if mod == rec->arch.mod */ + } else + mod = rec->arch.mod; + + return __ftrace_make_nop(mod, rec, addr); +} + +#ifdef CONFIG_MODULES +/* + * Examine the existing instructions for __ftrace_make_call. + * They should effectively be a NOP, and follow formal constraints, + * depending on the ABI. Return false if they don't. + */ +static bool expected_nop_sequence(void *ip, ppc_inst_t op0, ppc_inst_t op1) +{ + if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS)) + return ppc_inst_equal(op0, ppc_inst(PPC_RAW_NOP())); + else + return ppc_inst_equal(op0, ppc_inst(PPC_RAW_BRANCH(8))) && + ppc_inst_equal(op1, ppc_inst(PPC_INST_LD_TOC)); +} + +static int +__ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr) +{ + ppc_inst_t op[2]; + void *ip = (void *)rec->ip; + unsigned long entry, ptr, tramp; + struct module *mod = rec->arch.mod; + + /* read where this goes */ + if (copy_inst_from_kernel_nofault(op, ip)) + return -EFAULT; + + if (!IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS) && + copy_inst_from_kernel_nofault(op + 1, ip + 4)) + return -EFAULT; + + if (!expected_nop_sequence(ip, op[0], op[1])) { + pr_err("Unexpected call sequence at %p: %08lx %08lx\n", ip, + ppc_inst_as_ulong(op[0]), ppc_inst_as_ulong(op[1])); + return -EINVAL; + } + + /* If we never set up ftrace trampoline(s), then bail */ + if (!mod->arch.tramp || + (IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS) && !mod->arch.tramp_regs)) { + pr_err("No ftrace trampoline\n"); + return -EINVAL; + } + + if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS) && rec->flags & FTRACE_FL_REGS) + tramp = mod->arch.tramp_regs; + else + tramp = mod->arch.tramp; + + if (module_trampoline_target(mod, tramp, &ptr)) { + pr_err("Failed to get trampoline target\n"); + return -EFAULT; + } + + pr_devel("trampoline target %lx", ptr); + + entry = ppc_global_function_entry((void *)addr); + /* This should match what was called */ + if (ptr != entry) { + pr_err("addr %lx does not match expected %lx\n", ptr, entry); + return -EINVAL; + } + + if (patch_branch(ip, tramp, BRANCH_SET_LINK)) { + pr_err("REL24 out of range!\n"); + return -EINVAL; + } + + return 0; +} +#else +static int __ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr) +{ + return 0; +} +#endif /* CONFIG_MODULES */ + +static int __ftrace_make_call_kernel(struct dyn_ftrace *rec, unsigned long addr) +{ + ppc_inst_t op; + void *ip = (void *)rec->ip; + unsigned long tramp, entry, ptr; + + /* Make sure we're being asked to patch branch to a known ftrace addr */ + entry = ppc_global_function_entry((void *)ftrace_caller); + ptr = ppc_global_function_entry((void *)addr); + + if (ptr != entry && IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS)) + entry = ppc_global_function_entry((void *)ftrace_regs_caller); + + if (ptr != entry) { + pr_err("Unknown ftrace addr to patch: %ps\n", (void *)ptr); + return -EINVAL; + } + + /* Make sure we have a nop */ + if (copy_inst_from_kernel_nofault(&op, ip)) { + pr_err("Unable to read ftrace location %p\n", ip); + return -EFAULT; + } + + if (!ppc_inst_equal(op, ppc_inst(PPC_RAW_NOP()))) { + pr_err("Unexpected call sequence at %p: %08lx\n", + ip, ppc_inst_as_ulong(op)); + return -EINVAL; + } + + tramp = find_ftrace_tramp((unsigned long)ip); + if (!tramp) { + pr_err("No ftrace trampolines reachable from %ps\n", ip); + return -EINVAL; + } + + if (patch_branch(ip, tramp, BRANCH_SET_LINK)) { + pr_err("Error patching branch to ftrace tramp!\n"); + return -EINVAL; + } + + return 0; +} + +int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr) +{ + unsigned long ip = rec->ip; + ppc_inst_t old, new; + + /* + * If the calling address is more that 24 bits away, + * then we had to use a trampoline to make the call. + * Otherwise just update the call site. + */ + if (test_24bit_addr(ip, addr)) { + /* within range */ + old = ppc_inst(PPC_RAW_NOP()); + new = ftrace_call_replace(ip, addr, 1); + return ftrace_modify_code(ip, old, new); + } else if (core_kernel_text(ip)) { + return __ftrace_make_call_kernel(rec, addr); + } else if (!IS_ENABLED(CONFIG_MODULES)) { + /* We should not get here without modules */ + return -EINVAL; + } + + /* + * Out of range jumps are called from modules. + * Being that we are converting from nop, it had better + * already have a module defined. + */ + if (!rec->arch.mod) { + pr_err("No module loaded\n"); + return -EINVAL; + } + + return __ftrace_make_call(rec, addr); +} + +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS +#ifdef CONFIG_MODULES +static int +__ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, + unsigned long addr) +{ + ppc_inst_t op; + unsigned long ip = rec->ip; + unsigned long entry, ptr, tramp; + struct module *mod = rec->arch.mod; + + /* If we never set up ftrace trampolines, then bail */ + if (!mod->arch.tramp || !mod->arch.tramp_regs) { + pr_err("No ftrace trampoline\n"); + return -EINVAL; + } + + /* read where this goes */ + if (copy_inst_from_kernel_nofault(&op, (void *)ip)) { + pr_err("Fetching opcode failed.\n"); + return -EFAULT; + } + + /* Make sure that this is still a 24bit jump */ + if (!is_bl_op(op)) { + pr_err("Not expected bl: opcode is %08lx\n", ppc_inst_as_ulong(op)); + return -EINVAL; + } + + /* lets find where the pointer goes */ + tramp = find_bl_target(ip, op); + entry = ppc_global_function_entry((void *)old_addr); + + pr_devel("ip:%lx jumps to %lx", ip, tramp); + + if (tramp != entry) { + /* old_addr is not within range, so we must have used a trampoline */ + if (module_trampoline_target(mod, tramp, &ptr)) { + pr_err("Failed to get trampoline target\n"); + return -EFAULT; + } + + pr_devel("trampoline target %lx", ptr); + + /* This should match what was called */ + if (ptr != entry) { + pr_err("addr %lx does not match expected %lx\n", ptr, entry); + return -EINVAL; + } + } + + /* The new target may be within range */ + if (test_24bit_addr(ip, addr)) { + /* within range */ + if (patch_branch((u32 *)ip, addr, BRANCH_SET_LINK)) { + pr_err("REL24 out of range!\n"); + return -EINVAL; + } + + return 0; + } + + if (rec->flags & FTRACE_FL_REGS) + tramp = mod->arch.tramp_regs; + else + tramp = mod->arch.tramp; + + if (module_trampoline_target(mod, tramp, &ptr)) { + pr_err("Failed to get trampoline target\n"); + return -EFAULT; + } + + pr_devel("trampoline target %lx", ptr); + + entry = ppc_global_function_entry((void *)addr); + /* This should match what was called */ + if (ptr != entry) { + pr_err("addr %lx does not match expected %lx\n", ptr, entry); + return -EINVAL; + } + + if (patch_branch((u32 *)ip, tramp, BRANCH_SET_LINK)) { + pr_err("REL24 out of range!\n"); + return -EINVAL; + } + + return 0; +} +#else +static int __ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, unsigned long addr) +{ + return 0; +} +#endif + +int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, + unsigned long addr) +{ + unsigned long ip = rec->ip; + ppc_inst_t old, new; + + /* + * If the calling address is more that 24 bits away, + * then we had to use a trampoline to make the call. + * Otherwise just update the call site. + */ + if (test_24bit_addr(ip, addr) && test_24bit_addr(ip, old_addr)) { + /* within range */ + old = ftrace_call_replace(ip, old_addr, 1); + new = ftrace_call_replace(ip, addr, 1); + return ftrace_modify_code(ip, old, new); + } else if (core_kernel_text(ip)) { + /* + * We always patch out of range locations to go to the regs + * variant, so there is nothing to do here + */ + return 0; + } else if (!IS_ENABLED(CONFIG_MODULES)) { + /* We should not get here without modules */ + return -EINVAL; + } + + /* + * Out of range jumps are called from modules. + */ + if (!rec->arch.mod) { + pr_err("No module loaded\n"); + return -EINVAL; + } + + return __ftrace_modify_call(rec, old_addr, addr); +} +#endif + +int ftrace_update_ftrace_func(ftrace_func_t func) +{ + unsigned long ip = (unsigned long)(&ftrace_call); + ppc_inst_t old, new; + int ret; + + old = ppc_inst_read((u32 *)&ftrace_call); + new = ftrace_call_replace(ip, (unsigned long)func, 1); + ret = ftrace_modify_code(ip, old, new); + + /* Also update the regs callback function */ + if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS) && !ret) { + ip = (unsigned long)(&ftrace_regs_call); + old = ppc_inst_read((u32 *)&ftrace_regs_call); + new = ftrace_call_replace(ip, (unsigned long)func, 1); + ret = ftrace_modify_code(ip, old, new); + } + + return ret; +} + +/* + * Use the default ftrace_modify_all_code, but without + * stop_machine(). + */ +void arch_ftrace_update_code(int command) +{ + ftrace_modify_all_code(command); +} + +#ifdef CONFIG_PPC64 +#define PACATOC offsetof(struct paca_struct, kernel_toc) + +extern unsigned int ftrace_tramp_text[], ftrace_tramp_init[]; + +void ftrace_free_init_tramp(void) +{ + int i; + + for (i = 0; i < NUM_FTRACE_TRAMPS && ftrace_tramps[i]; i++) + if (ftrace_tramps[i] == (unsigned long)ftrace_tramp_init) { + ftrace_tramps[i] = 0; + return; + } +} + +int __init ftrace_dyn_arch_init(void) +{ + int i; + unsigned int *tramp[] = { ftrace_tramp_text, ftrace_tramp_init }; + u32 stub_insns[] = { + PPC_RAW_LD(_R12, _R13, PACATOC), + PPC_RAW_ADDIS(_R12, _R12, 0), + PPC_RAW_ADDI(_R12, _R12, 0), + PPC_RAW_MTCTR(_R12), + PPC_RAW_BCTR() + }; + unsigned long addr; + long reladdr; + + if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS)) + addr = ppc_global_function_entry((void *)ftrace_regs_caller); + else + addr = ppc_global_function_entry((void *)ftrace_caller); + + reladdr = addr - kernel_toc_addr(); + + if (reladdr >= SZ_2G || reladdr < -(long)SZ_2G) { + pr_err("Address of %ps out of range of kernel_toc.\n", + (void *)addr); + return -1; + } + + for (i = 0; i < 2; i++) { + memcpy(tramp[i], stub_insns, sizeof(stub_insns)); + tramp[i][1] |= PPC_HA(reladdr); + tramp[i][2] |= PPC_LO(reladdr); + add_ftrace_tramp((unsigned long)tramp[i]); + } + + return 0; +} +#endif + +#ifdef CONFIG_FUNCTION_GRAPH_TRACER + +extern void ftrace_graph_call(void); +extern void ftrace_graph_stub(void); + +static int ftrace_modify_ftrace_graph_caller(bool enable) +{ + unsigned long ip = (unsigned long)(&ftrace_graph_call); + unsigned long addr = (unsigned long)(&ftrace_graph_caller); + unsigned long stub = (unsigned long)(&ftrace_graph_stub); + ppc_inst_t old, new; + + if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_ARGS)) + return 0; + + old = ftrace_call_replace(ip, enable ? stub : addr, 0); + new = ftrace_call_replace(ip, enable ? addr : stub, 0); + + return ftrace_modify_code(ip, old, new); +} + +int ftrace_enable_ftrace_graph_caller(void) +{ + return ftrace_modify_ftrace_graph_caller(true); +} + +int ftrace_disable_ftrace_graph_caller(void) +{ + return ftrace_modify_ftrace_graph_caller(false); +} + +/* + * Hook the return address and push it in the stack of return addrs + * in current thread info. Return the address we want to divert to. + */ +static unsigned long +__prepare_ftrace_return(unsigned long parent, unsigned long ip, unsigned long sp) +{ + unsigned long return_hooker; + int bit; + + if (unlikely(ftrace_graph_is_dead())) + goto out; + + if (unlikely(atomic_read(¤t->tracing_graph_pause))) + goto out; + + bit = ftrace_test_recursion_trylock(ip, parent); + if (bit < 0) + goto out; + + return_hooker = ppc_function_entry(return_to_handler); + + if (!function_graph_enter(parent, ip, 0, (unsigned long *)sp)) + parent = return_hooker; + + ftrace_test_recursion_unlock(bit); +out: + return parent; +} + +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS +void ftrace_graph_func(unsigned long ip, unsigned long parent_ip, + struct ftrace_ops *op, struct ftrace_regs *fregs) +{ + fregs->regs.link = __prepare_ftrace_return(parent_ip, ip, fregs->regs.gpr[1]); +} +#else +unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip, + unsigned long sp) +{ + return __prepare_ftrace_return(parent, ip, sp); +} +#endif +#endif /* CONFIG_FUNCTION_GRAPH_TRACER */ + +#ifdef CONFIG_PPC64_ELF_ABI_V1 +char *arch_ftrace_match_adjust(char *str, const char *search) +{ + if (str[0] == '.' && search[0] != '.') + return str + 1; + else + return str; +} +#endif /* CONFIG_PPC64_ELF_ABI_V1 */ diff --git a/arch/powerpc/kernel/trace/ftrace_64_pg.S b/arch/powerpc/kernel/trace/ftrace_64_pg.S new file mode 100644 index 000000000..6708e24db --- /dev/null +++ b/arch/powerpc/kernel/trace/ftrace_64_pg.S @@ -0,0 +1,67 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Split from ftrace_64.S + */ + +#include <linux/magic.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/ftrace.h> +#include <asm/ppc-opcode.h> +#include <asm/export.h> + +_GLOBAL_TOC(ftrace_caller) + lbz r3, PACA_FTRACE_ENABLED(r13) + cmpdi r3, 0 + beqlr + + /* Taken from output of objdump from lib64/glibc */ + mflr r3 + ld r11, 0(r1) + stdu r1, -112(r1) + std r3, 128(r1) + ld r4, 16(r11) + subi r3, r3, MCOUNT_INSN_SIZE +.globl ftrace_call +ftrace_call: + bl ftrace_stub + nop +#ifdef CONFIG_FUNCTION_GRAPH_TRACER +.globl ftrace_graph_call +ftrace_graph_call: + b ftrace_graph_stub +_GLOBAL(ftrace_graph_stub) +#endif + ld r0, 128(r1) + mtlr r0 + addi r1, r1, 112 + +_GLOBAL(ftrace_stub) + blr + +#ifdef CONFIG_FUNCTION_GRAPH_TRACER +_GLOBAL(ftrace_graph_caller) + addi r5, r1, 112 + /* load r4 with local address */ + ld r4, 128(r1) + subi r4, r4, MCOUNT_INSN_SIZE + + /* Grab the LR out of the caller stack frame */ + ld r11, 112(r1) + ld r3, 16(r11) + + bl prepare_ftrace_return + nop + + /* + * prepare_ftrace_return gives us the address we divert to. + * Change the LR in the callers stack frame to this. + */ + ld r11, 112(r1) + std r3, 16(r11) + + ld r0, 128(r1) + mtlr r0 + addi r1, r1, 112 + blr +#endif /* CONFIG_FUNCTION_GRAPH_TRACER */ diff --git a/arch/powerpc/kernel/trace/ftrace_low.S b/arch/powerpc/kernel/trace/ftrace_low.S new file mode 100644 index 000000000..294d1e059 --- /dev/null +++ b/arch/powerpc/kernel/trace/ftrace_low.S @@ -0,0 +1,78 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Split from entry_64.S + */ + +#include <linux/magic.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/ftrace.h> +#include <asm/ppc-opcode.h> +#include <asm/export.h> + +#ifdef CONFIG_PPC64 +.pushsection ".tramp.ftrace.text","aw",@progbits; +.globl ftrace_tramp_text +ftrace_tramp_text: + .space 64 +.popsection + +.pushsection ".tramp.ftrace.init","aw",@progbits; +.globl ftrace_tramp_init +ftrace_tramp_init: + .space 64 +.popsection +#endif + +_GLOBAL(mcount) +_GLOBAL(_mcount) +EXPORT_SYMBOL(_mcount) + mflr r12 + mtctr r12 + mtlr r0 + bctr + +#ifdef CONFIG_FUNCTION_GRAPH_TRACER +_GLOBAL(return_to_handler) + /* need to save return values */ +#ifdef CONFIG_PPC64 + std r4, -32(r1) + std r3, -24(r1) + /* save TOC */ + std r2, -16(r1) + std r31, -8(r1) + mr r31, r1 + stdu r1, -112(r1) + + /* + * We might be called from a module. + * Switch to our TOC to run inside the core kernel. + */ + LOAD_PACA_TOC() +#else + stwu r1, -16(r1) + stw r3, 8(r1) + stw r4, 12(r1) +#endif + + bl ftrace_return_to_handler + nop + + /* return value has real return address */ + mtlr r3 + +#ifdef CONFIG_PPC64 + ld r1, 0(r1) + ld r4, -32(r1) + ld r3, -24(r1) + ld r2, -16(r1) + ld r31, -8(r1) +#else + lwz r3, 8(r1) + lwz r4, 12(r1) + addi r1, r1, 16 +#endif + + /* Jump back to real return address */ + blr +#endif /* CONFIG_FUNCTION_GRAPH_TRACER */ diff --git a/arch/powerpc/kernel/trace/ftrace_mprofile.S b/arch/powerpc/kernel/trace/ftrace_mprofile.S new file mode 100644 index 000000000..f4a72b384 --- /dev/null +++ b/arch/powerpc/kernel/trace/ftrace_mprofile.S @@ -0,0 +1,256 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Split from ftrace_64.S + */ + +#include <linux/magic.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/ftrace.h> +#include <asm/ppc-opcode.h> +#include <asm/export.h> +#include <asm/thread_info.h> +#include <asm/bug.h> +#include <asm/ptrace.h> + +/* + * + * ftrace_caller()/ftrace_regs_caller() is the function that replaces _mcount() + * when ftrace is active. + * + * We arrive here after a function A calls function B, and we are the trace + * function for B. When we enter r1 points to A's stack frame, B has not yet + * had a chance to allocate one yet. + * + * Additionally r2 may point either to the TOC for A, or B, depending on + * whether B did a TOC setup sequence before calling us. + * + * On entry the LR points back to the _mcount() call site, and r0 holds the + * saved LR as it was on entry to B, ie. the original return address at the + * call site in A. + * + * Our job is to save the register state into a struct pt_regs (on the stack) + * and then arrange for the ftrace function to be called. + */ +.macro ftrace_regs_entry allregs + /* Create a minimal stack frame for representing B */ + PPC_STLU r1, -STACK_FRAME_MIN_SIZE(r1) + + /* Create our stack frame + pt_regs */ + PPC_STLU r1,-SWITCH_FRAME_SIZE(r1) + + /* Save all gprs to pt_regs */ + SAVE_GPR(0, r1) + SAVE_GPRS(3, 10, r1) + +#ifdef CONFIG_PPC64 + /* Save the original return address in A's stack frame */ + std r0, LRSAVE+SWITCH_FRAME_SIZE+STACK_FRAME_MIN_SIZE(r1) + /* Ok to continue? */ + lbz r3, PACA_FTRACE_ENABLED(r13) + cmpdi r3, 0 + beq ftrace_no_trace +#endif + + .if \allregs == 1 + SAVE_GPR(2, r1) + SAVE_GPRS(11, 31, r1) + .else +#ifdef CONFIG_LIVEPATCH_64 + SAVE_GPR(14, r1) +#endif + .endif + + /* Save previous stack pointer (r1) */ + addi r8, r1, SWITCH_FRAME_SIZE+STACK_FRAME_MIN_SIZE + PPC_STL r8, GPR1(r1) + + .if \allregs == 1 + /* Load special regs for save below */ + mfmsr r8 + mfctr r9 + mfxer r10 + mfcr r11 + .else + /* Clear MSR to flag as ftrace_caller versus frace_regs_caller */ + li r8, 0 + .endif + + /* Get the _mcount() call site out of LR */ + mflr r7 + /* Save it as pt_regs->nip */ + PPC_STL r7, _NIP(r1) + /* Also save it in B's stackframe header for proper unwind */ + PPC_STL r7, LRSAVE+SWITCH_FRAME_SIZE(r1) + /* Save the read LR in pt_regs->link */ + PPC_STL r0, _LINK(r1) + +#ifdef CONFIG_PPC64 + /* Save callee's TOC in the ABI compliant location */ + std r2, STK_GOT(r1) + LOAD_PACA_TOC() /* get kernel TOC in r2 */ + LOAD_REG_ADDR(r3, function_trace_op) + ld r5,0(r3) +#else + lis r3,function_trace_op@ha + lwz r5,function_trace_op@l(r3) +#endif + +#ifdef CONFIG_LIVEPATCH_64 + mr r14, r7 /* remember old NIP */ +#endif + + /* Calculate ip from nip-4 into r3 for call below */ + subi r3, r7, MCOUNT_INSN_SIZE + + /* Put the original return address in r4 as parent_ip */ + mr r4, r0 + + /* Save special regs */ + PPC_STL r8, _MSR(r1) + .if \allregs == 1 + PPC_STL r9, _CTR(r1) + PPC_STL r10, _XER(r1) + PPC_STL r11, _CCR(r1) + .endif + + /* Load &pt_regs in r6 for call below */ + addi r6, r1, STACK_FRAME_OVERHEAD +.endm + +.macro ftrace_regs_exit allregs + /* Load ctr with the possibly modified NIP */ + PPC_LL r3, _NIP(r1) + mtctr r3 + +#ifdef CONFIG_LIVEPATCH_64 + cmpd r14, r3 /* has NIP been altered? */ +#endif + + /* Restore gprs */ + .if \allregs == 1 + REST_GPRS(2, 31, r1) + .else + REST_GPRS(3, 10, r1) +#ifdef CONFIG_LIVEPATCH_64 + REST_GPR(14, r1) +#endif + .endif + + /* Restore possibly modified LR */ + PPC_LL r0, _LINK(r1) + mtlr r0 + +#ifdef CONFIG_PPC64 + /* Restore callee's TOC */ + ld r2, STK_GOT(r1) +#endif + + /* Pop our stack frame */ + addi r1, r1, SWITCH_FRAME_SIZE+STACK_FRAME_MIN_SIZE + +#ifdef CONFIG_LIVEPATCH_64 + /* Based on the cmpd above, if the NIP was altered handle livepatch */ + bne- livepatch_handler +#endif + bctr /* jump after _mcount site */ +.endm + +_GLOBAL(ftrace_regs_caller) + ftrace_regs_entry 1 + /* ftrace_call(r3, r4, r5, r6) */ +.globl ftrace_regs_call +ftrace_regs_call: + bl ftrace_stub + nop + ftrace_regs_exit 1 + +_GLOBAL(ftrace_caller) + ftrace_regs_entry 0 + /* ftrace_call(r3, r4, r5, r6) */ +.globl ftrace_call +ftrace_call: + bl ftrace_stub + nop + ftrace_regs_exit 0 + +_GLOBAL(ftrace_stub) + blr + +#ifdef CONFIG_PPC64 +ftrace_no_trace: + mflr r3 + mtctr r3 + REST_GPR(3, r1) + addi r1, r1, SWITCH_FRAME_SIZE+STACK_FRAME_MIN_SIZE + mtlr r0 + bctr +#endif + +#ifdef CONFIG_LIVEPATCH_64 + /* + * This function runs in the mcount context, between two functions. As + * such it can only clobber registers which are volatile and used in + * function linkage. + * + * We get here when a function A, calls another function B, but B has + * been live patched with a new function C. + * + * On entry: + * - we have no stack frame and can not allocate one + * - LR points back to the original caller (in A) + * - CTR holds the new NIP in C + * - r0, r11 & r12 are free + */ +livepatch_handler: + ld r12, PACA_THREAD_INFO(r13) + + /* Allocate 3 x 8 bytes */ + ld r11, TI_livepatch_sp(r12) + addi r11, r11, 24 + std r11, TI_livepatch_sp(r12) + + /* Save toc & real LR on livepatch stack */ + std r2, -24(r11) + mflr r12 + std r12, -16(r11) + + /* Store stack end marker */ + lis r12, STACK_END_MAGIC@h + ori r12, r12, STACK_END_MAGIC@l + std r12, -8(r11) + + /* Put ctr in r12 for global entry and branch there */ + mfctr r12 + bctrl + + /* + * Now we are returning from the patched function to the original + * caller A. We are free to use r11, r12 and we can use r2 until we + * restore it. + */ + + ld r12, PACA_THREAD_INFO(r13) + + ld r11, TI_livepatch_sp(r12) + + /* Check stack marker hasn't been trashed */ + lis r2, STACK_END_MAGIC@h + ori r2, r2, STACK_END_MAGIC@l + ld r12, -8(r11) +1: tdne r12, r2 + EMIT_BUG_ENTRY 1b, __FILE__, __LINE__ - 1, 0 + + /* Restore LR & toc from livepatch stack */ + ld r12, -16(r11) + mtlr r12 + ld r2, -24(r11) + + /* Pop livepatch stack frame */ + ld r12, PACA_THREAD_INFO(r13) + subi r11, r11, 24 + std r11, TI_livepatch_sp(r12) + + /* Return to original caller of live patched function */ + blr +#endif /* CONFIG_LIVEPATCH */ diff --git a/arch/powerpc/kernel/trace/trace_clock.c b/arch/powerpc/kernel/trace/trace_clock.c new file mode 100644 index 000000000..b0143a313 --- /dev/null +++ b/arch/powerpc/kernel/trace/trace_clock.c @@ -0,0 +1,13 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * + * Copyright (C) 2015 Naveen N. Rao, IBM Corporation + */ + +#include <asm/trace_clock.h> +#include <asm/time.h> + +u64 notrace trace_clock_ppc_tb(void) +{ + return get_tb(); +} diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c new file mode 100644 index 000000000..3956f3268 --- /dev/null +++ b/arch/powerpc/kernel/traps.c @@ -0,0 +1,2314 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * Copyright 2007-2010 Freescale Semiconductor, Inc. + * + * Modified by Cort Dougan (cort@cs.nmt.edu) + * and Paul Mackerras (paulus@samba.org) + */ + +/* + * This file handles the architecture-dependent parts of hardware exceptions + */ + +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/sched/debug.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/pkeys.h> +#include <linux/stddef.h> +#include <linux/unistd.h> +#include <linux/ptrace.h> +#include <linux/user.h> +#include <linux/interrupt.h> +#include <linux/init.h> +#include <linux/extable.h> +#include <linux/module.h> /* print_modules */ +#include <linux/prctl.h> +#include <linux/delay.h> +#include <linux/kprobes.h> +#include <linux/kexec.h> +#include <linux/backlight.h> +#include <linux/bug.h> +#include <linux/kdebug.h> +#include <linux/ratelimit.h> +#include <linux/context_tracking.h> +#include <linux/smp.h> +#include <linux/console.h> +#include <linux/kmsg_dump.h> +#include <linux/debugfs.h> + +#include <asm/emulated_ops.h> +#include <linux/uaccess.h> +#include <asm/interrupt.h> +#include <asm/io.h> +#include <asm/machdep.h> +#include <asm/rtas.h> +#include <asm/pmc.h> +#include <asm/reg.h> +#ifdef CONFIG_PMAC_BACKLIGHT +#include <asm/backlight.h> +#endif +#ifdef CONFIG_PPC64 +#include <asm/firmware.h> +#include <asm/processor.h> +#endif +#include <asm/kexec.h> +#include <asm/ppc-opcode.h> +#include <asm/rio.h> +#include <asm/fadump.h> +#include <asm/switch_to.h> +#include <asm/tm.h> +#include <asm/debug.h> +#include <asm/asm-prototypes.h> +#include <asm/hmi.h> +#include <sysdev/fsl_pci.h> +#include <asm/kprobes.h> +#include <asm/stacktrace.h> +#include <asm/nmi.h> +#include <asm/disassemble.h> +#include <asm/udbg.h> + +#if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC_CORE) +int (*__debugger)(struct pt_regs *regs) __read_mostly; +int (*__debugger_ipi)(struct pt_regs *regs) __read_mostly; +int (*__debugger_bpt)(struct pt_regs *regs) __read_mostly; +int (*__debugger_sstep)(struct pt_regs *regs) __read_mostly; +int (*__debugger_iabr_match)(struct pt_regs *regs) __read_mostly; +int (*__debugger_break_match)(struct pt_regs *regs) __read_mostly; +int (*__debugger_fault_handler)(struct pt_regs *regs) __read_mostly; + +EXPORT_SYMBOL(__debugger); +EXPORT_SYMBOL(__debugger_ipi); +EXPORT_SYMBOL(__debugger_bpt); +EXPORT_SYMBOL(__debugger_sstep); +EXPORT_SYMBOL(__debugger_iabr_match); +EXPORT_SYMBOL(__debugger_break_match); +EXPORT_SYMBOL(__debugger_fault_handler); +#endif + +/* Transactional Memory trap debug */ +#ifdef TM_DEBUG_SW +#define TM_DEBUG(x...) printk(KERN_INFO x) +#else +#define TM_DEBUG(x...) do { } while(0) +#endif + +static const char *signame(int signr) +{ + switch (signr) { + case SIGBUS: return "bus error"; + case SIGFPE: return "floating point exception"; + case SIGILL: return "illegal instruction"; + case SIGSEGV: return "segfault"; + case SIGTRAP: return "unhandled trap"; + } + + return "unknown signal"; +} + +/* + * Trap & Exception support + */ + +#ifdef CONFIG_PMAC_BACKLIGHT +static void pmac_backlight_unblank(void) +{ + mutex_lock(&pmac_backlight_mutex); + if (pmac_backlight) { + struct backlight_properties *props; + + props = &pmac_backlight->props; + props->brightness = props->max_brightness; + props->power = FB_BLANK_UNBLANK; + backlight_update_status(pmac_backlight); + } + mutex_unlock(&pmac_backlight_mutex); +} +#else +static inline void pmac_backlight_unblank(void) { } +#endif + +/* + * If oops/die is expected to crash the machine, return true here. + * + * This should not be expected to be 100% accurate, there may be + * notifiers registered or other unexpected conditions that may bring + * down the kernel. Or if the current process in the kernel is holding + * locks or has other critical state, the kernel may become effectively + * unusable anyway. + */ +bool die_will_crash(void) +{ + if (should_fadump_crash()) + return true; + if (kexec_should_crash(current)) + return true; + if (in_interrupt() || panic_on_oops || + !current->pid || is_global_init(current)) + return true; + + return false; +} + +static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED; +static int die_owner = -1; +static unsigned int die_nest_count; +static int die_counter; + +extern void panic_flush_kmsg_start(void) +{ + /* + * These are mostly taken from kernel/panic.c, but tries to do + * relatively minimal work. Don't use delay functions (TB may + * be broken), don't crash dump (need to set a firmware log), + * don't run notifiers. We do want to get some information to + * Linux console. + */ + console_verbose(); + bust_spinlocks(1); +} + +extern void panic_flush_kmsg_end(void) +{ + kmsg_dump(KMSG_DUMP_PANIC); + bust_spinlocks(0); + debug_locks_off(); + console_flush_on_panic(CONSOLE_FLUSH_PENDING); +} + +static unsigned long oops_begin(struct pt_regs *regs) +{ + int cpu; + unsigned long flags; + + oops_enter(); + + /* racy, but better than risking deadlock. */ + raw_local_irq_save(flags); + cpu = smp_processor_id(); + if (!arch_spin_trylock(&die_lock)) { + if (cpu == die_owner) + /* nested oops. should stop eventually */; + else + arch_spin_lock(&die_lock); + } + die_nest_count++; + die_owner = cpu; + console_verbose(); + bust_spinlocks(1); + if (machine_is(powermac)) + pmac_backlight_unblank(); + return flags; +} +NOKPROBE_SYMBOL(oops_begin); + +static void oops_end(unsigned long flags, struct pt_regs *regs, + int signr) +{ + bust_spinlocks(0); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); + die_nest_count--; + oops_exit(); + printk("\n"); + if (!die_nest_count) { + /* Nest count reaches zero, release the lock. */ + die_owner = -1; + arch_spin_unlock(&die_lock); + } + raw_local_irq_restore(flags); + + /* + * system_reset_excption handles debugger, crash dump, panic, for 0x100 + */ + if (TRAP(regs) == INTERRUPT_SYSTEM_RESET) + return; + + crash_fadump(regs, "die oops"); + + if (kexec_should_crash(current)) + crash_kexec(regs); + + if (!signr) + return; + + /* + * While our oops output is serialised by a spinlock, output + * from panic() called below can race and corrupt it. If we + * know we are going to panic, delay for 1 second so we have a + * chance to get clean backtraces from all CPUs that are oopsing. + */ + if (in_interrupt() || panic_on_oops || !current->pid || + is_global_init(current)) { + mdelay(MSEC_PER_SEC); + } + + if (panic_on_oops) + panic("Fatal exception"); + make_task_dead(signr); +} +NOKPROBE_SYMBOL(oops_end); + +static char *get_mmu_str(void) +{ + if (early_radix_enabled()) + return " MMU=Radix"; + if (early_mmu_has_feature(MMU_FTR_HPTE_TABLE)) + return " MMU=Hash"; + return ""; +} + +static int __die(const char *str, struct pt_regs *regs, long err) +{ + printk("Oops: %s, sig: %ld [#%d]\n", str, err, ++die_counter); + + printk("%s PAGE_SIZE=%luK%s%s%s%s%s%s %s\n", + IS_ENABLED(CONFIG_CPU_LITTLE_ENDIAN) ? "LE" : "BE", + PAGE_SIZE / 1024, get_mmu_str(), + IS_ENABLED(CONFIG_PREEMPT) ? " PREEMPT" : "", + IS_ENABLED(CONFIG_SMP) ? " SMP" : "", + IS_ENABLED(CONFIG_SMP) ? (" NR_CPUS=" __stringify(NR_CPUS)) : "", + debug_pagealloc_enabled() ? " DEBUG_PAGEALLOC" : "", + IS_ENABLED(CONFIG_NUMA) ? " NUMA" : "", + ppc_md.name ? ppc_md.name : ""); + + if (notify_die(DIE_OOPS, str, regs, err, 255, SIGSEGV) == NOTIFY_STOP) + return 1; + + print_modules(); + show_regs(regs); + + return 0; +} +NOKPROBE_SYMBOL(__die); + +void die(const char *str, struct pt_regs *regs, long err) +{ + unsigned long flags; + + /* + * system_reset_excption handles debugger, crash dump, panic, for 0x100 + */ + if (TRAP(regs) != INTERRUPT_SYSTEM_RESET) { + if (debugger(regs)) + return; + } + + flags = oops_begin(regs); + if (__die(str, regs, err)) + err = 0; + oops_end(flags, regs, err); +} +NOKPROBE_SYMBOL(die); + +void user_single_step_report(struct pt_regs *regs) +{ + force_sig_fault(SIGTRAP, TRAP_TRACE, (void __user *)regs->nip); +} + +static void show_signal_msg(int signr, struct pt_regs *regs, int code, + unsigned long addr) +{ + static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL, + DEFAULT_RATELIMIT_BURST); + + if (!show_unhandled_signals) + return; + + if (!unhandled_signal(current, signr)) + return; + + if (!__ratelimit(&rs)) + return; + + pr_info("%s[%d]: %s (%d) at %lx nip %lx lr %lx code %x", + current->comm, current->pid, signame(signr), signr, + addr, regs->nip, regs->link, code); + + print_vma_addr(KERN_CONT " in ", regs->nip); + + pr_cont("\n"); + + show_user_instructions(regs); +} + +static bool exception_common(int signr, struct pt_regs *regs, int code, + unsigned long addr) +{ + if (!user_mode(regs)) { + die("Exception in kernel mode", regs, signr); + return false; + } + + /* + * Must not enable interrupts even for user-mode exception, because + * this can be called from machine check, which may be a NMI or IRQ + * which don't like interrupts being enabled. Could check for + * in_hardirq || in_nmi perhaps, but there doesn't seem to be a good + * reason why _exception() should enable irqs for an exception handler, + * the handlers themselves do that directly. + */ + + show_signal_msg(signr, regs, code, addr); + + current->thread.trap_nr = code; + + return true; +} + +void _exception_pkey(struct pt_regs *regs, unsigned long addr, int key) +{ + if (!exception_common(SIGSEGV, regs, SEGV_PKUERR, addr)) + return; + + force_sig_pkuerr((void __user *) addr, key); +} + +void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr) +{ + if (!exception_common(signr, regs, code, addr)) + return; + + force_sig_fault(signr, code, (void __user *)addr); +} + +/* + * The interrupt architecture has a quirk in that the HV interrupts excluding + * the NMIs (0x100 and 0x200) do not clear MSR[RI] at entry. The first thing + * that an interrupt handler must do is save off a GPR into a scratch register, + * and all interrupts on POWERNV (HV=1) use the HSPRG1 register as scratch. + * Therefore an NMI can clobber an HV interrupt's live HSPRG1 without noticing + * that it is non-reentrant, which leads to random data corruption. + * + * The solution is for NMI interrupts in HV mode to check if they originated + * from these critical HV interrupt regions. If so, then mark them not + * recoverable. + * + * An alternative would be for HV NMIs to use SPRG for scratch to avoid the + * HSPRG1 clobber, however this would cause guest SPRG to be clobbered. Linux + * guests should always have MSR[RI]=0 when its scratch SPRG is in use, so + * that would work. However any other guest OS that may have the SPRG live + * and MSR[RI]=1 could encounter silent corruption. + * + * Builds that do not support KVM could take this second option to increase + * the recoverability of NMIs. + */ +noinstr void hv_nmi_check_nonrecoverable(struct pt_regs *regs) +{ +#ifdef CONFIG_PPC_POWERNV + unsigned long kbase = (unsigned long)_stext; + unsigned long nip = regs->nip; + + if (!(regs->msr & MSR_RI)) + return; + if (!(regs->msr & MSR_HV)) + return; + if (regs->msr & MSR_PR) + return; + + /* + * Now test if the interrupt has hit a range that may be using + * HSPRG1 without having RI=0 (i.e., an HSRR interrupt). The + * problem ranges all run un-relocated. Test real and virt modes + * at the same time by dropping the high bit of the nip (virt mode + * entry points still have the +0x4000 offset). + */ + nip &= ~0xc000000000000000ULL; + if ((nip >= 0x500 && nip < 0x600) || (nip >= 0x4500 && nip < 0x4600)) + goto nonrecoverable; + if ((nip >= 0x980 && nip < 0xa00) || (nip >= 0x4980 && nip < 0x4a00)) + goto nonrecoverable; + if ((nip >= 0xe00 && nip < 0xec0) || (nip >= 0x4e00 && nip < 0x4ec0)) + goto nonrecoverable; + if ((nip >= 0xf80 && nip < 0xfa0) || (nip >= 0x4f80 && nip < 0x4fa0)) + goto nonrecoverable; + + /* Trampoline code runs un-relocated so subtract kbase. */ + if (nip >= (unsigned long)(start_real_trampolines - kbase) && + nip < (unsigned long)(end_real_trampolines - kbase)) + goto nonrecoverable; + if (nip >= (unsigned long)(start_virt_trampolines - kbase) && + nip < (unsigned long)(end_virt_trampolines - kbase)) + goto nonrecoverable; + return; + +nonrecoverable: + regs->msr &= ~MSR_RI; + local_paca->hsrr_valid = 0; + local_paca->srr_valid = 0; +#endif +} +DEFINE_INTERRUPT_HANDLER_NMI(system_reset_exception) +{ + unsigned long hsrr0, hsrr1; + bool saved_hsrrs = false; + + /* + * System reset can interrupt code where HSRRs are live and MSR[RI]=1. + * The system reset interrupt itself may clobber HSRRs (e.g., to call + * OPAL), so save them here and restore them before returning. + * + * Machine checks don't need to save HSRRs, as the real mode handler + * is careful to avoid them, and the regular handler is not delivered + * as an NMI. + */ + if (cpu_has_feature(CPU_FTR_HVMODE)) { + hsrr0 = mfspr(SPRN_HSRR0); + hsrr1 = mfspr(SPRN_HSRR1); + saved_hsrrs = true; + } + + hv_nmi_check_nonrecoverable(regs); + + __this_cpu_inc(irq_stat.sreset_irqs); + + /* See if any machine dependent calls */ + if (ppc_md.system_reset_exception) { + if (ppc_md.system_reset_exception(regs)) + goto out; + } + + if (debugger(regs)) + goto out; + + kmsg_dump(KMSG_DUMP_OOPS); + /* + * A system reset is a request to dump, so we always send + * it through the crashdump code (if fadump or kdump are + * registered). + */ + crash_fadump(regs, "System Reset"); + + crash_kexec(regs); + + /* + * We aren't the primary crash CPU. We need to send it + * to a holding pattern to avoid it ending up in the panic + * code. + */ + crash_kexec_secondary(regs); + + /* + * No debugger or crash dump registered, print logs then + * panic. + */ + die("System Reset", regs, SIGABRT); + + mdelay(2*MSEC_PER_SEC); /* Wait a little while for others to print */ + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); + nmi_panic(regs, "System Reset"); + +out: +#ifdef CONFIG_PPC_BOOK3S_64 + BUG_ON(get_paca()->in_nmi == 0); + if (get_paca()->in_nmi > 1) + die("Unrecoverable nested System Reset", regs, SIGABRT); +#endif + /* Must die if the interrupt is not recoverable */ + if (regs_is_unrecoverable(regs)) { + /* For the reason explained in die_mce, nmi_exit before die */ + nmi_exit(); + die("Unrecoverable System Reset", regs, SIGABRT); + } + + if (saved_hsrrs) { + mtspr(SPRN_HSRR0, hsrr0); + mtspr(SPRN_HSRR1, hsrr1); + } + + /* What should we do here? We could issue a shutdown or hard reset. */ + + return 0; +} + +/* + * I/O accesses can cause machine checks on powermacs. + * Check if the NIP corresponds to the address of a sync + * instruction for which there is an entry in the exception + * table. + * -- paulus. + */ +static inline int check_io_access(struct pt_regs *regs) +{ +#ifdef CONFIG_PPC32 + unsigned long msr = regs->msr; + const struct exception_table_entry *entry; + unsigned int *nip = (unsigned int *)regs->nip; + + if (((msr & 0xffff0000) == 0 || (msr & (0x80000 | 0x40000))) + && (entry = search_exception_tables(regs->nip)) != NULL) { + /* + * Check that it's a sync instruction, or somewhere + * in the twi; isync; nop sequence that inb/inw/inl uses. + * As the address is in the exception table + * we should be able to read the instr there. + * For the debug message, we look at the preceding + * load or store. + */ + if (*nip == PPC_RAW_NOP()) + nip -= 2; + else if (*nip == PPC_RAW_ISYNC()) + --nip; + if (*nip == PPC_RAW_SYNC() || get_op(*nip) == OP_TRAP) { + unsigned int rb; + + --nip; + rb = (*nip >> 11) & 0x1f; + printk(KERN_DEBUG "%s bad port %lx at %p\n", + (*nip & 0x100)? "OUT to": "IN from", + regs->gpr[rb] - _IO_BASE, nip); + regs_set_recoverable(regs); + regs_set_return_ip(regs, extable_fixup(entry)); + return 1; + } + } +#endif /* CONFIG_PPC32 */ + return 0; +} + +#ifdef CONFIG_PPC_ADV_DEBUG_REGS +/* On 4xx, the reason for the machine check or program exception + is in the ESR. */ +#define get_reason(regs) ((regs)->esr) +#define REASON_FP ESR_FP +#define REASON_ILLEGAL (ESR_PIL | ESR_PUO) +#define REASON_PRIVILEGED ESR_PPR +#define REASON_TRAP ESR_PTR +#define REASON_PREFIXED 0 +#define REASON_BOUNDARY 0 + +/* single-step stuff */ +#define single_stepping(regs) (current->thread.debug.dbcr0 & DBCR0_IC) +#define clear_single_step(regs) (current->thread.debug.dbcr0 &= ~DBCR0_IC) +#define clear_br_trace(regs) do {} while(0) +#else +/* On non-4xx, the reason for the machine check or program + exception is in the MSR. */ +#define get_reason(regs) ((regs)->msr) +#define REASON_TM SRR1_PROGTM +#define REASON_FP SRR1_PROGFPE +#define REASON_ILLEGAL SRR1_PROGILL +#define REASON_PRIVILEGED SRR1_PROGPRIV +#define REASON_TRAP SRR1_PROGTRAP +#define REASON_PREFIXED SRR1_PREFIXED +#define REASON_BOUNDARY SRR1_BOUNDARY + +#define single_stepping(regs) ((regs)->msr & MSR_SE) +#define clear_single_step(regs) (regs_set_return_msr((regs), (regs)->msr & ~MSR_SE)) +#define clear_br_trace(regs) (regs_set_return_msr((regs), (regs)->msr & ~MSR_BE)) +#endif + +#define inst_length(reason) (((reason) & REASON_PREFIXED) ? 8 : 4) + +#if defined(CONFIG_PPC_E500) +int machine_check_e500mc(struct pt_regs *regs) +{ + unsigned long mcsr = mfspr(SPRN_MCSR); + unsigned long pvr = mfspr(SPRN_PVR); + unsigned long reason = mcsr; + int recoverable = 1; + + if (reason & MCSR_LD) { + recoverable = fsl_rio_mcheck_exception(regs); + if (recoverable == 1) + goto silent_out; + } + + printk("Machine check in kernel mode.\n"); + printk("Caused by (from MCSR=%lx): ", reason); + + if (reason & MCSR_MCP) + pr_cont("Machine Check Signal\n"); + + if (reason & MCSR_ICPERR) { + pr_cont("Instruction Cache Parity Error\n"); + + /* + * This is recoverable by invalidating the i-cache. + */ + mtspr(SPRN_L1CSR1, mfspr(SPRN_L1CSR1) | L1CSR1_ICFI); + while (mfspr(SPRN_L1CSR1) & L1CSR1_ICFI) + ; + + /* + * This will generally be accompanied by an instruction + * fetch error report -- only treat MCSR_IF as fatal + * if it wasn't due to an L1 parity error. + */ + reason &= ~MCSR_IF; + } + + if (reason & MCSR_DCPERR_MC) { + pr_cont("Data Cache Parity Error\n"); + + /* + * In write shadow mode we auto-recover from the error, but it + * may still get logged and cause a machine check. We should + * only treat the non-write shadow case as non-recoverable. + */ + /* On e6500 core, L1 DCWS (Data cache write shadow mode) bit + * is not implemented but L1 data cache always runs in write + * shadow mode. Hence on data cache parity errors HW will + * automatically invalidate the L1 Data Cache. + */ + if (PVR_VER(pvr) != PVR_VER_E6500) { + if (!(mfspr(SPRN_L1CSR2) & L1CSR2_DCWS)) + recoverable = 0; + } + } + + if (reason & MCSR_L2MMU_MHIT) { + pr_cont("Hit on multiple TLB entries\n"); + recoverable = 0; + } + + if (reason & MCSR_NMI) + pr_cont("Non-maskable interrupt\n"); + + if (reason & MCSR_IF) { + pr_cont("Instruction Fetch Error Report\n"); + recoverable = 0; + } + + if (reason & MCSR_LD) { + pr_cont("Load Error Report\n"); + recoverable = 0; + } + + if (reason & MCSR_ST) { + pr_cont("Store Error Report\n"); + recoverable = 0; + } + + if (reason & MCSR_LDG) { + pr_cont("Guarded Load Error Report\n"); + recoverable = 0; + } + + if (reason & MCSR_TLBSYNC) + pr_cont("Simultaneous tlbsync operations\n"); + + if (reason & MCSR_BSL2_ERR) { + pr_cont("Level 2 Cache Error\n"); + recoverable = 0; + } + + if (reason & MCSR_MAV) { + u64 addr; + + addr = mfspr(SPRN_MCAR); + addr |= (u64)mfspr(SPRN_MCARU) << 32; + + pr_cont("Machine Check %s Address: %#llx\n", + reason & MCSR_MEA ? "Effective" : "Physical", addr); + } + +silent_out: + mtspr(SPRN_MCSR, mcsr); + return mfspr(SPRN_MCSR) == 0 && recoverable; +} + +int machine_check_e500(struct pt_regs *regs) +{ + unsigned long reason = mfspr(SPRN_MCSR); + + if (reason & MCSR_BUS_RBERR) { + if (fsl_rio_mcheck_exception(regs)) + return 1; + if (fsl_pci_mcheck_exception(regs)) + return 1; + } + + printk("Machine check in kernel mode.\n"); + printk("Caused by (from MCSR=%lx): ", reason); + + if (reason & MCSR_MCP) + pr_cont("Machine Check Signal\n"); + if (reason & MCSR_ICPERR) + pr_cont("Instruction Cache Parity Error\n"); + if (reason & MCSR_DCP_PERR) + pr_cont("Data Cache Push Parity Error\n"); + if (reason & MCSR_DCPERR) + pr_cont("Data Cache Parity Error\n"); + if (reason & MCSR_BUS_IAERR) + pr_cont("Bus - Instruction Address Error\n"); + if (reason & MCSR_BUS_RAERR) + pr_cont("Bus - Read Address Error\n"); + if (reason & MCSR_BUS_WAERR) + pr_cont("Bus - Write Address Error\n"); + if (reason & MCSR_BUS_IBERR) + pr_cont("Bus - Instruction Data Error\n"); + if (reason & MCSR_BUS_RBERR) + pr_cont("Bus - Read Data Bus Error\n"); + if (reason & MCSR_BUS_WBERR) + pr_cont("Bus - Write Data Bus Error\n"); + if (reason & MCSR_BUS_IPERR) + pr_cont("Bus - Instruction Parity Error\n"); + if (reason & MCSR_BUS_RPERR) + pr_cont("Bus - Read Parity Error\n"); + + return 0; +} + +int machine_check_generic(struct pt_regs *regs) +{ + return 0; +} +#elif defined(CONFIG_PPC32) +int machine_check_generic(struct pt_regs *regs) +{ + unsigned long reason = regs->msr; + + printk("Machine check in kernel mode.\n"); + printk("Caused by (from SRR1=%lx): ", reason); + switch (reason & 0x601F0000) { + case 0x80000: + pr_cont("Machine check signal\n"); + break; + case 0x40000: + case 0x140000: /* 7450 MSS error and TEA */ + pr_cont("Transfer error ack signal\n"); + break; + case 0x20000: + pr_cont("Data parity error signal\n"); + break; + case 0x10000: + pr_cont("Address parity error signal\n"); + break; + case 0x20000000: + pr_cont("L1 Data Cache error\n"); + break; + case 0x40000000: + pr_cont("L1 Instruction Cache error\n"); + break; + case 0x00100000: + pr_cont("L2 data cache parity error\n"); + break; + default: + pr_cont("Unknown values in msr\n"); + } + return 0; +} +#endif /* everything else */ + +void die_mce(const char *str, struct pt_regs *regs, long err) +{ + /* + * The machine check wants to kill the interrupted context, + * but make_task_dead() checks for in_interrupt() and panics + * in that case, so exit the irq/nmi before calling die. + */ + if (in_nmi()) + nmi_exit(); + else + irq_exit(); + die(str, regs, err); +} + +/* + * BOOK3S_64 does not usually call this handler as a non-maskable interrupt + * (it uses its own early real-mode handler to handle the MCE proper + * and then raises irq_work to call this handler when interrupts are + * enabled). The only time when this is not true is if the early handler + * is unrecoverable, then it does call this directly to try to get a + * message out. + */ +static void __machine_check_exception(struct pt_regs *regs) +{ + int recover = 0; + + __this_cpu_inc(irq_stat.mce_exceptions); + + add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE); + + /* See if any machine dependent calls. In theory, we would want + * to call the CPU first, and call the ppc_md. one if the CPU + * one returns a positive number. However there is existing code + * that assumes the board gets a first chance, so let's keep it + * that way for now and fix things later. --BenH. + */ + if (ppc_md.machine_check_exception) + recover = ppc_md.machine_check_exception(regs); + else if (cur_cpu_spec->machine_check) + recover = cur_cpu_spec->machine_check(regs); + + if (recover > 0) + goto bail; + + if (debugger_fault_handler(regs)) + goto bail; + + if (check_io_access(regs)) + goto bail; + + die_mce("Machine check", regs, SIGBUS); + +bail: + /* Must die if the interrupt is not recoverable */ + if (regs_is_unrecoverable(regs)) + die_mce("Unrecoverable Machine check", regs, SIGBUS); +} + +#ifdef CONFIG_PPC_BOOK3S_64 +DEFINE_INTERRUPT_HANDLER_RAW(machine_check_early_boot) +{ + udbg_printf("Machine check (early boot)\n"); + udbg_printf("SRR0=0x%016lx SRR1=0x%016lx\n", regs->nip, regs->msr); + udbg_printf(" DAR=0x%016lx DSISR=0x%08lx\n", regs->dar, regs->dsisr); + udbg_printf(" LR=0x%016lx R1=0x%08lx\n", regs->link, regs->gpr[1]); + udbg_printf("------\n"); + die("Machine check (early boot)", regs, SIGBUS); + for (;;) + ; + return 0; +} + +DEFINE_INTERRUPT_HANDLER_ASYNC(machine_check_exception_async) +{ + __machine_check_exception(regs); +} +#endif +DEFINE_INTERRUPT_HANDLER_NMI(machine_check_exception) +{ + __machine_check_exception(regs); + + return 0; +} + +DEFINE_INTERRUPT_HANDLER(SMIException) /* async? */ +{ + die("System Management Interrupt", regs, SIGABRT); +} + +#ifdef CONFIG_VSX +static void p9_hmi_special_emu(struct pt_regs *regs) +{ + unsigned int ra, rb, t, i, sel, instr, rc; + const void __user *addr; + u8 vbuf[16] __aligned(16), *vdst; + unsigned long ea, msr, msr_mask; + bool swap; + + if (__get_user(instr, (unsigned int __user *)regs->nip)) + return; + + /* + * lxvb16x opcode: 0x7c0006d8 + * lxvd2x opcode: 0x7c000698 + * lxvh8x opcode: 0x7c000658 + * lxvw4x opcode: 0x7c000618 + */ + if ((instr & 0xfc00073e) != 0x7c000618) { + pr_devel("HMI vec emu: not vector CI %i:%s[%d] nip=%016lx" + " instr=%08x\n", + smp_processor_id(), current->comm, current->pid, + regs->nip, instr); + return; + } + + /* Grab vector registers into the task struct */ + msr = regs->msr; /* Grab msr before we flush the bits */ + flush_vsx_to_thread(current); + enable_kernel_altivec(); + + /* + * Is userspace running with a different endian (this is rare but + * not impossible) + */ + swap = (msr & MSR_LE) != (MSR_KERNEL & MSR_LE); + + /* Decode the instruction */ + ra = (instr >> 16) & 0x1f; + rb = (instr >> 11) & 0x1f; + t = (instr >> 21) & 0x1f; + if (instr & 1) + vdst = (u8 *)¤t->thread.vr_state.vr[t]; + else + vdst = (u8 *)¤t->thread.fp_state.fpr[t][0]; + + /* Grab the vector address */ + ea = regs->gpr[rb] + (ra ? regs->gpr[ra] : 0); + if (is_32bit_task()) + ea &= 0xfffffffful; + addr = (__force const void __user *)ea; + + /* Check it */ + if (!access_ok(addr, 16)) { + pr_devel("HMI vec emu: bad access %i:%s[%d] nip=%016lx" + " instr=%08x addr=%016lx\n", + smp_processor_id(), current->comm, current->pid, + regs->nip, instr, (unsigned long)addr); + return; + } + + /* Read the vector */ + rc = 0; + if ((unsigned long)addr & 0xfUL) + /* unaligned case */ + rc = __copy_from_user_inatomic(vbuf, addr, 16); + else + __get_user_atomic_128_aligned(vbuf, addr, rc); + if (rc) { + pr_devel("HMI vec emu: page fault %i:%s[%d] nip=%016lx" + " instr=%08x addr=%016lx\n", + smp_processor_id(), current->comm, current->pid, + regs->nip, instr, (unsigned long)addr); + return; + } + + pr_devel("HMI vec emu: emulated vector CI %i:%s[%d] nip=%016lx" + " instr=%08x addr=%016lx\n", + smp_processor_id(), current->comm, current->pid, regs->nip, + instr, (unsigned long) addr); + + /* Grab instruction "selector" */ + sel = (instr >> 6) & 3; + + /* + * Check to make sure the facility is actually enabled. This + * could happen if we get a false positive hit. + * + * lxvd2x/lxvw4x always check MSR VSX sel = 0,2 + * lxvh8x/lxvb16x check MSR VSX or VEC depending on VSR used sel = 1,3 + */ + msr_mask = MSR_VSX; + if ((sel & 1) && (instr & 1)) /* lxvh8x & lxvb16x + VSR >= 32 */ + msr_mask = MSR_VEC; + if (!(msr & msr_mask)) { + pr_devel("HMI vec emu: MSR fac clear %i:%s[%d] nip=%016lx" + " instr=%08x msr:%016lx\n", + smp_processor_id(), current->comm, current->pid, + regs->nip, instr, msr); + return; + } + + /* Do logging here before we modify sel based on endian */ + switch (sel) { + case 0: /* lxvw4x */ + PPC_WARN_EMULATED(lxvw4x, regs); + break; + case 1: /* lxvh8x */ + PPC_WARN_EMULATED(lxvh8x, regs); + break; + case 2: /* lxvd2x */ + PPC_WARN_EMULATED(lxvd2x, regs); + break; + case 3: /* lxvb16x */ + PPC_WARN_EMULATED(lxvb16x, regs); + break; + } + +#ifdef __LITTLE_ENDIAN__ + /* + * An LE kernel stores the vector in the task struct as an LE + * byte array (effectively swapping both the components and + * the content of the components). Those instructions expect + * the components to remain in ascending address order, so we + * swap them back. + * + * If we are running a BE user space, the expectation is that + * of a simple memcpy, so forcing the emulation to look like + * a lxvb16x should do the trick. + */ + if (swap) + sel = 3; + + switch (sel) { + case 0: /* lxvw4x */ + for (i = 0; i < 4; i++) + ((u32 *)vdst)[i] = ((u32 *)vbuf)[3-i]; + break; + case 1: /* lxvh8x */ + for (i = 0; i < 8; i++) + ((u16 *)vdst)[i] = ((u16 *)vbuf)[7-i]; + break; + case 2: /* lxvd2x */ + for (i = 0; i < 2; i++) + ((u64 *)vdst)[i] = ((u64 *)vbuf)[1-i]; + break; + case 3: /* lxvb16x */ + for (i = 0; i < 16; i++) + vdst[i] = vbuf[15-i]; + break; + } +#else /* __LITTLE_ENDIAN__ */ + /* On a big endian kernel, a BE userspace only needs a memcpy */ + if (!swap) + sel = 3; + + /* Otherwise, we need to swap the content of the components */ + switch (sel) { + case 0: /* lxvw4x */ + for (i = 0; i < 4; i++) + ((u32 *)vdst)[i] = cpu_to_le32(((u32 *)vbuf)[i]); + break; + case 1: /* lxvh8x */ + for (i = 0; i < 8; i++) + ((u16 *)vdst)[i] = cpu_to_le16(((u16 *)vbuf)[i]); + break; + case 2: /* lxvd2x */ + for (i = 0; i < 2; i++) + ((u64 *)vdst)[i] = cpu_to_le64(((u64 *)vbuf)[i]); + break; + case 3: /* lxvb16x */ + memcpy(vdst, vbuf, 16); + break; + } +#endif /* !__LITTLE_ENDIAN__ */ + + /* Go to next instruction */ + regs_add_return_ip(regs, 4); +} +#endif /* CONFIG_VSX */ + +DEFINE_INTERRUPT_HANDLER_ASYNC(handle_hmi_exception) +{ + struct pt_regs *old_regs; + + old_regs = set_irq_regs(regs); + +#ifdef CONFIG_VSX + /* Real mode flagged P9 special emu is needed */ + if (local_paca->hmi_p9_special_emu) { + local_paca->hmi_p9_special_emu = 0; + + /* + * We don't want to take page faults while doing the + * emulation, we just replay the instruction if necessary. + */ + pagefault_disable(); + p9_hmi_special_emu(regs); + pagefault_enable(); + } +#endif /* CONFIG_VSX */ + + if (ppc_md.handle_hmi_exception) + ppc_md.handle_hmi_exception(regs); + + set_irq_regs(old_regs); +} + +DEFINE_INTERRUPT_HANDLER(unknown_exception) +{ + printk("Bad trap at PC: %lx, SR: %lx, vector=%lx\n", + regs->nip, regs->msr, regs->trap); + + _exception(SIGTRAP, regs, TRAP_UNK, 0); +} + +DEFINE_INTERRUPT_HANDLER_ASYNC(unknown_async_exception) +{ + printk("Bad trap at PC: %lx, SR: %lx, vector=%lx\n", + regs->nip, regs->msr, regs->trap); + + _exception(SIGTRAP, regs, TRAP_UNK, 0); +} + +DEFINE_INTERRUPT_HANDLER_NMI(unknown_nmi_exception) +{ + printk("Bad trap at PC: %lx, SR: %lx, vector=%lx\n", + regs->nip, regs->msr, regs->trap); + + _exception(SIGTRAP, regs, TRAP_UNK, 0); + + return 0; +} + +DEFINE_INTERRUPT_HANDLER(instruction_breakpoint_exception) +{ + if (notify_die(DIE_IABR_MATCH, "iabr_match", regs, 5, + 5, SIGTRAP) == NOTIFY_STOP) + return; + if (debugger_iabr_match(regs)) + return; + _exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip); +} + +DEFINE_INTERRUPT_HANDLER(RunModeException) +{ + _exception(SIGTRAP, regs, TRAP_UNK, 0); +} + +static void __single_step_exception(struct pt_regs *regs) +{ + clear_single_step(regs); + clear_br_trace(regs); + + if (kprobe_post_handler(regs)) + return; + + if (notify_die(DIE_SSTEP, "single_step", regs, 5, + 5, SIGTRAP) == NOTIFY_STOP) + return; + if (debugger_sstep(regs)) + return; + + _exception(SIGTRAP, regs, TRAP_TRACE, regs->nip); +} + +DEFINE_INTERRUPT_HANDLER(single_step_exception) +{ + __single_step_exception(regs); +} + +/* + * After we have successfully emulated an instruction, we have to + * check if the instruction was being single-stepped, and if so, + * pretend we got a single-step exception. This was pointed out + * by Kumar Gala. -- paulus + */ +static void emulate_single_step(struct pt_regs *regs) +{ + if (single_stepping(regs)) + __single_step_exception(regs); +} + +#ifdef CONFIG_PPC_FPU_REGS +static inline int __parse_fpscr(unsigned long fpscr) +{ + int ret = FPE_FLTUNK; + + /* Invalid operation */ + if ((fpscr & FPSCR_VE) && (fpscr & FPSCR_VX)) + ret = FPE_FLTINV; + + /* Overflow */ + else if ((fpscr & FPSCR_OE) && (fpscr & FPSCR_OX)) + ret = FPE_FLTOVF; + + /* Underflow */ + else if ((fpscr & FPSCR_UE) && (fpscr & FPSCR_UX)) + ret = FPE_FLTUND; + + /* Divide by zero */ + else if ((fpscr & FPSCR_ZE) && (fpscr & FPSCR_ZX)) + ret = FPE_FLTDIV; + + /* Inexact result */ + else if ((fpscr & FPSCR_XE) && (fpscr & FPSCR_XX)) + ret = FPE_FLTRES; + + return ret; +} +#endif + +static void parse_fpe(struct pt_regs *regs) +{ + int code = 0; + + flush_fp_to_thread(current); + +#ifdef CONFIG_PPC_FPU_REGS + code = __parse_fpscr(current->thread.fp_state.fpscr); +#endif + + _exception(SIGFPE, regs, code, regs->nip); +} + +/* + * Illegal instruction emulation support. Originally written to + * provide the PVR to user applications using the mfspr rd, PVR. + * Return non-zero if we can't emulate, or -EFAULT if the associated + * memory access caused an access fault. Return zero on success. + * + * There are a couple of ways to do this, either "decode" the instruction + * or directly match lots of bits. In this case, matching lots of + * bits is faster and easier. + * + */ +static int emulate_string_inst(struct pt_regs *regs, u32 instword) +{ + u8 rT = (instword >> 21) & 0x1f; + u8 rA = (instword >> 16) & 0x1f; + u8 NB_RB = (instword >> 11) & 0x1f; + u32 num_bytes; + unsigned long EA; + int pos = 0; + + /* Early out if we are an invalid form of lswx */ + if ((instword & PPC_INST_STRING_MASK) == PPC_INST_LSWX) + if ((rT == rA) || (rT == NB_RB)) + return -EINVAL; + + EA = (rA == 0) ? 0 : regs->gpr[rA]; + + switch (instword & PPC_INST_STRING_MASK) { + case PPC_INST_LSWX: + case PPC_INST_STSWX: + EA += NB_RB; + num_bytes = regs->xer & 0x7f; + break; + case PPC_INST_LSWI: + case PPC_INST_STSWI: + num_bytes = (NB_RB == 0) ? 32 : NB_RB; + break; + default: + return -EINVAL; + } + + while (num_bytes != 0) + { + u8 val; + u32 shift = 8 * (3 - (pos & 0x3)); + + /* if process is 32-bit, clear upper 32 bits of EA */ + if ((regs->msr & MSR_64BIT) == 0) + EA &= 0xFFFFFFFF; + + switch ((instword & PPC_INST_STRING_MASK)) { + case PPC_INST_LSWX: + case PPC_INST_LSWI: + if (get_user(val, (u8 __user *)EA)) + return -EFAULT; + /* first time updating this reg, + * zero it out */ + if (pos == 0) + regs->gpr[rT] = 0; + regs->gpr[rT] |= val << shift; + break; + case PPC_INST_STSWI: + case PPC_INST_STSWX: + val = regs->gpr[rT] >> shift; + if (put_user(val, (u8 __user *)EA)) + return -EFAULT; + break; + } + /* move EA to next address */ + EA += 1; + num_bytes--; + + /* manage our position within the register */ + if (++pos == 4) { + pos = 0; + if (++rT == 32) + rT = 0; + } + } + + return 0; +} + +static int emulate_popcntb_inst(struct pt_regs *regs, u32 instword) +{ + u32 ra,rs; + unsigned long tmp; + + ra = (instword >> 16) & 0x1f; + rs = (instword >> 21) & 0x1f; + + tmp = regs->gpr[rs]; + tmp = tmp - ((tmp >> 1) & 0x5555555555555555ULL); + tmp = (tmp & 0x3333333333333333ULL) + ((tmp >> 2) & 0x3333333333333333ULL); + tmp = (tmp + (tmp >> 4)) & 0x0f0f0f0f0f0f0f0fULL; + regs->gpr[ra] = tmp; + + return 0; +} + +static int emulate_isel(struct pt_regs *regs, u32 instword) +{ + u8 rT = (instword >> 21) & 0x1f; + u8 rA = (instword >> 16) & 0x1f; + u8 rB = (instword >> 11) & 0x1f; + u8 BC = (instword >> 6) & 0x1f; + u8 bit; + unsigned long tmp; + + tmp = (rA == 0) ? 0 : regs->gpr[rA]; + bit = (regs->ccr >> (31 - BC)) & 0x1; + + regs->gpr[rT] = bit ? tmp : regs->gpr[rB]; + + return 0; +} + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +static inline bool tm_abort_check(struct pt_regs *regs, int cause) +{ + /* If we're emulating a load/store in an active transaction, we cannot + * emulate it as the kernel operates in transaction suspended context. + * We need to abort the transaction. This creates a persistent TM + * abort so tell the user what caused it with a new code. + */ + if (MSR_TM_TRANSACTIONAL(regs->msr)) { + tm_enable(); + tm_abort(cause); + return true; + } + return false; +} +#else +static inline bool tm_abort_check(struct pt_regs *regs, int reason) +{ + return false; +} +#endif + +static int emulate_instruction(struct pt_regs *regs) +{ + u32 instword; + u32 rd; + + if (!user_mode(regs)) + return -EINVAL; + + if (get_user(instword, (u32 __user *)(regs->nip))) + return -EFAULT; + + /* Emulate the mfspr rD, PVR. */ + if ((instword & PPC_INST_MFSPR_PVR_MASK) == PPC_INST_MFSPR_PVR) { + PPC_WARN_EMULATED(mfpvr, regs); + rd = (instword >> 21) & 0x1f; + regs->gpr[rd] = mfspr(SPRN_PVR); + return 0; + } + + /* Emulating the dcba insn is just a no-op. */ + if ((instword & PPC_INST_DCBA_MASK) == PPC_INST_DCBA) { + PPC_WARN_EMULATED(dcba, regs); + return 0; + } + + /* Emulate the mcrxr insn. */ + if ((instword & PPC_INST_MCRXR_MASK) == PPC_INST_MCRXR) { + int shift = (instword >> 21) & 0x1c; + unsigned long msk = 0xf0000000UL >> shift; + + PPC_WARN_EMULATED(mcrxr, regs); + regs->ccr = (regs->ccr & ~msk) | ((regs->xer >> shift) & msk); + regs->xer &= ~0xf0000000UL; + return 0; + } + + /* Emulate load/store string insn. */ + if ((instword & PPC_INST_STRING_GEN_MASK) == PPC_INST_STRING) { + if (tm_abort_check(regs, + TM_CAUSE_EMULATE | TM_CAUSE_PERSISTENT)) + return -EINVAL; + PPC_WARN_EMULATED(string, regs); + return emulate_string_inst(regs, instword); + } + + /* Emulate the popcntb (Population Count Bytes) instruction. */ + if ((instword & PPC_INST_POPCNTB_MASK) == PPC_INST_POPCNTB) { + PPC_WARN_EMULATED(popcntb, regs); + return emulate_popcntb_inst(regs, instword); + } + + /* Emulate isel (Integer Select) instruction */ + if ((instword & PPC_INST_ISEL_MASK) == PPC_INST_ISEL) { + PPC_WARN_EMULATED(isel, regs); + return emulate_isel(regs, instword); + } + + /* Emulate sync instruction variants */ + if ((instword & PPC_INST_SYNC_MASK) == PPC_INST_SYNC) { + PPC_WARN_EMULATED(sync, regs); + asm volatile("sync"); + return 0; + } + +#ifdef CONFIG_PPC64 + /* Emulate the mfspr rD, DSCR. */ + if ((((instword & PPC_INST_MFSPR_DSCR_USER_MASK) == + PPC_INST_MFSPR_DSCR_USER) || + ((instword & PPC_INST_MFSPR_DSCR_MASK) == + PPC_INST_MFSPR_DSCR)) && + cpu_has_feature(CPU_FTR_DSCR)) { + PPC_WARN_EMULATED(mfdscr, regs); + rd = (instword >> 21) & 0x1f; + regs->gpr[rd] = mfspr(SPRN_DSCR); + return 0; + } + /* Emulate the mtspr DSCR, rD. */ + if ((((instword & PPC_INST_MTSPR_DSCR_USER_MASK) == + PPC_INST_MTSPR_DSCR_USER) || + ((instword & PPC_INST_MTSPR_DSCR_MASK) == + PPC_INST_MTSPR_DSCR)) && + cpu_has_feature(CPU_FTR_DSCR)) { + PPC_WARN_EMULATED(mtdscr, regs); + rd = (instword >> 21) & 0x1f; + current->thread.dscr = regs->gpr[rd]; + current->thread.dscr_inherit = 1; + mtspr(SPRN_DSCR, current->thread.dscr); + return 0; + } +#endif + + return -EINVAL; +} + +int is_valid_bugaddr(unsigned long addr) +{ + return is_kernel_addr(addr); +} + +#ifdef CONFIG_MATH_EMULATION +static int emulate_math(struct pt_regs *regs) +{ + int ret; + + ret = do_mathemu(regs); + if (ret >= 0) + PPC_WARN_EMULATED(math, regs); + + switch (ret) { + case 0: + emulate_single_step(regs); + return 0; + case 1: { + int code = 0; + code = __parse_fpscr(current->thread.fp_state.fpscr); + _exception(SIGFPE, regs, code, regs->nip); + return 0; + } + case -EFAULT: + _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip); + return 0; + } + + return -1; +} +#else +static inline int emulate_math(struct pt_regs *regs) { return -1; } +#endif + +static void do_program_check(struct pt_regs *regs) +{ + unsigned int reason = get_reason(regs); + + /* We can now get here via a FP Unavailable exception if the core + * has no FPU, in that case the reason flags will be 0 */ + + if (reason & REASON_FP) { + /* IEEE FP exception */ + parse_fpe(regs); + return; + } + if (reason & REASON_TRAP) { + unsigned long bugaddr; + /* Debugger is first in line to stop recursive faults in + * rcu_lock, notify_die, or atomic_notifier_call_chain */ + if (debugger_bpt(regs)) + return; + + if (kprobe_handler(regs)) + return; + + /* trap exception */ + if (notify_die(DIE_BPT, "breakpoint", regs, 5, 5, SIGTRAP) + == NOTIFY_STOP) + return; + + bugaddr = regs->nip; + /* + * Fixup bugaddr for BUG_ON() in real mode + */ + if (!is_kernel_addr(bugaddr) && !(regs->msr & MSR_IR)) + bugaddr += PAGE_OFFSET; + + if (!(regs->msr & MSR_PR) && /* not user-mode */ + report_bug(bugaddr, regs) == BUG_TRAP_TYPE_WARN) { + const struct exception_table_entry *entry; + + entry = search_exception_tables(bugaddr); + if (entry) { + regs_set_return_ip(regs, extable_fixup(entry) + regs->nip - bugaddr); + return; + } + } + _exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip); + return; + } +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + if (reason & REASON_TM) { + /* This is a TM "Bad Thing Exception" program check. + * This occurs when: + * - An rfid/hrfid/mtmsrd attempts to cause an illegal + * transition in TM states. + * - A trechkpt is attempted when transactional. + * - A treclaim is attempted when non transactional. + * - A tend is illegally attempted. + * - writing a TM SPR when transactional. + * + * If usermode caused this, it's done something illegal and + * gets a SIGILL slap on the wrist. We call it an illegal + * operand to distinguish from the instruction just being bad + * (e.g. executing a 'tend' on a CPU without TM!); it's an + * illegal /placement/ of a valid instruction. + */ + if (user_mode(regs)) { + _exception(SIGILL, regs, ILL_ILLOPN, regs->nip); + return; + } else { + printk(KERN_EMERG "Unexpected TM Bad Thing exception " + "at %lx (msr 0x%lx) tm_scratch=%llx\n", + regs->nip, regs->msr, get_paca()->tm_scratch); + die("Unrecoverable exception", regs, SIGABRT); + } + } +#endif + + /* + * If we took the program check in the kernel skip down to sending a + * SIGILL. The subsequent cases all relate to emulating instructions + * which we should only do for userspace. We also do not want to enable + * interrupts for kernel faults because that might lead to further + * faults, and loose the context of the original exception. + */ + if (!user_mode(regs)) + goto sigill; + + interrupt_cond_local_irq_enable(regs); + + /* (reason & REASON_ILLEGAL) would be the obvious thing here, + * but there seems to be a hardware bug on the 405GP (RevD) + * that means ESR is sometimes set incorrectly - either to + * ESR_DST (!?) or 0. In the process of chasing this with the + * hardware people - not sure if it can happen on any illegal + * instruction or only on FP instructions, whether there is a + * pattern to occurrences etc. -dgibson 31/Mar/2003 + */ + if (!emulate_math(regs)) + return; + + /* Try to emulate it if we should. */ + if (reason & (REASON_ILLEGAL | REASON_PRIVILEGED)) { + switch (emulate_instruction(regs)) { + case 0: + regs_add_return_ip(regs, 4); + emulate_single_step(regs); + return; + case -EFAULT: + _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip); + return; + } + } + +sigill: + if (reason & REASON_PRIVILEGED) + _exception(SIGILL, regs, ILL_PRVOPC, regs->nip); + else + _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); + +} + +DEFINE_INTERRUPT_HANDLER(program_check_exception) +{ + do_program_check(regs); +} + +/* + * This occurs when running in hypervisor mode on POWER6 or later + * and an illegal instruction is encountered. + */ +DEFINE_INTERRUPT_HANDLER(emulation_assist_interrupt) +{ + regs_set_return_msr(regs, regs->msr | REASON_ILLEGAL); + do_program_check(regs); +} + +DEFINE_INTERRUPT_HANDLER(alignment_exception) +{ + int sig, code, fixed = 0; + unsigned long reason; + + interrupt_cond_local_irq_enable(regs); + + reason = get_reason(regs); + if (reason & REASON_BOUNDARY) { + sig = SIGBUS; + code = BUS_ADRALN; + goto bad; + } + + if (tm_abort_check(regs, TM_CAUSE_ALIGNMENT | TM_CAUSE_PERSISTENT)) + return; + + /* we don't implement logging of alignment exceptions */ + if (!(current->thread.align_ctl & PR_UNALIGN_SIGBUS)) + fixed = fix_alignment(regs); + + if (fixed == 1) { + /* skip over emulated instruction */ + regs_add_return_ip(regs, inst_length(reason)); + emulate_single_step(regs); + return; + } + + /* Operand address was bad */ + if (fixed == -EFAULT) { + sig = SIGSEGV; + code = SEGV_ACCERR; + } else { + sig = SIGBUS; + code = BUS_ADRALN; + } +bad: + if (user_mode(regs)) + _exception(sig, regs, code, regs->dar); + else + bad_page_fault(regs, sig); +} + +DEFINE_INTERRUPT_HANDLER(stack_overflow_exception) +{ + die("Kernel stack overflow", regs, SIGSEGV); +} + +DEFINE_INTERRUPT_HANDLER(kernel_fp_unavailable_exception) +{ + printk(KERN_EMERG "Unrecoverable FP Unavailable Exception " + "%lx at %lx\n", regs->trap, regs->nip); + die("Unrecoverable FP Unavailable Exception", regs, SIGABRT); +} + +DEFINE_INTERRUPT_HANDLER(altivec_unavailable_exception) +{ + if (user_mode(regs)) { + /* A user program has executed an altivec instruction, + but this kernel doesn't support altivec. */ + _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); + return; + } + + printk(KERN_EMERG "Unrecoverable VMX/Altivec Unavailable Exception " + "%lx at %lx\n", regs->trap, regs->nip); + die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT); +} + +DEFINE_INTERRUPT_HANDLER(vsx_unavailable_exception) +{ + if (user_mode(regs)) { + /* A user program has executed an vsx instruction, + but this kernel doesn't support vsx. */ + _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); + return; + } + + printk(KERN_EMERG "Unrecoverable VSX Unavailable Exception " + "%lx at %lx\n", regs->trap, regs->nip); + die("Unrecoverable VSX Unavailable Exception", regs, SIGABRT); +} + +#ifdef CONFIG_PPC_BOOK3S_64 +static void tm_unavailable(struct pt_regs *regs) +{ +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + if (user_mode(regs)) { + current->thread.load_tm++; + regs_set_return_msr(regs, regs->msr | MSR_TM); + tm_enable(); + tm_restore_sprs(¤t->thread); + return; + } +#endif + pr_emerg("Unrecoverable TM Unavailable Exception " + "%lx at %lx\n", regs->trap, regs->nip); + die("Unrecoverable TM Unavailable Exception", regs, SIGABRT); +} + +DEFINE_INTERRUPT_HANDLER(facility_unavailable_exception) +{ + static char *facility_strings[] = { + [FSCR_FP_LG] = "FPU", + [FSCR_VECVSX_LG] = "VMX/VSX", + [FSCR_DSCR_LG] = "DSCR", + [FSCR_PM_LG] = "PMU SPRs", + [FSCR_BHRB_LG] = "BHRB", + [FSCR_TM_LG] = "TM", + [FSCR_EBB_LG] = "EBB", + [FSCR_TAR_LG] = "TAR", + [FSCR_MSGP_LG] = "MSGP", + [FSCR_SCV_LG] = "SCV", + [FSCR_PREFIX_LG] = "PREFIX", + }; + char *facility = "unknown"; + u64 value; + u32 instword, rd; + u8 status; + bool hv; + + hv = (TRAP(regs) == INTERRUPT_H_FAC_UNAVAIL); + if (hv) + value = mfspr(SPRN_HFSCR); + else + value = mfspr(SPRN_FSCR); + + status = value >> 56; + if ((hv || status >= 2) && + (status < ARRAY_SIZE(facility_strings)) && + facility_strings[status]) + facility = facility_strings[status]; + + /* We should not have taken this interrupt in kernel */ + if (!user_mode(regs)) { + pr_emerg("Facility '%s' unavailable (%d) exception in kernel mode at %lx\n", + facility, status, regs->nip); + die("Unexpected facility unavailable exception", regs, SIGABRT); + } + + interrupt_cond_local_irq_enable(regs); + + if (status == FSCR_DSCR_LG) { + /* + * User is accessing the DSCR register using the problem + * state only SPR number (0x03) either through a mfspr or + * a mtspr instruction. If it is a write attempt through + * a mtspr, then we set the inherit bit. This also allows + * the user to write or read the register directly in the + * future by setting via the FSCR DSCR bit. But in case it + * is a read DSCR attempt through a mfspr instruction, we + * just emulate the instruction instead. This code path will + * always emulate all the mfspr instructions till the user + * has attempted at least one mtspr instruction. This way it + * preserves the same behaviour when the user is accessing + * the DSCR through privilege level only SPR number (0x11) + * which is emulated through illegal instruction exception. + * We always leave HFSCR DSCR set. + */ + if (get_user(instword, (u32 __user *)(regs->nip))) { + pr_err("Failed to fetch the user instruction\n"); + return; + } + + /* Write into DSCR (mtspr 0x03, RS) */ + if ((instword & PPC_INST_MTSPR_DSCR_USER_MASK) + == PPC_INST_MTSPR_DSCR_USER) { + rd = (instword >> 21) & 0x1f; + current->thread.dscr = regs->gpr[rd]; + current->thread.dscr_inherit = 1; + current->thread.fscr |= FSCR_DSCR; + mtspr(SPRN_FSCR, current->thread.fscr); + } + + /* Read from DSCR (mfspr RT, 0x03) */ + if ((instword & PPC_INST_MFSPR_DSCR_USER_MASK) + == PPC_INST_MFSPR_DSCR_USER) { + if (emulate_instruction(regs)) { + pr_err("DSCR based mfspr emulation failed\n"); + return; + } + regs_add_return_ip(regs, 4); + emulate_single_step(regs); + } + return; + } + + if (status == FSCR_TM_LG) { + /* + * If we're here then the hardware is TM aware because it + * generated an exception with FSRM_TM set. + * + * If cpu_has_feature(CPU_FTR_TM) is false, then either firmware + * told us not to do TM, or the kernel is not built with TM + * support. + * + * If both of those things are true, then userspace can spam the + * console by triggering the printk() below just by continually + * doing tbegin (or any TM instruction). So in that case just + * send the process a SIGILL immediately. + */ + if (!cpu_has_feature(CPU_FTR_TM)) + goto out; + + tm_unavailable(regs); + return; + } + + pr_err_ratelimited("%sFacility '%s' unavailable (%d), exception at 0x%lx, MSR=%lx\n", + hv ? "Hypervisor " : "", facility, status, regs->nip, regs->msr); + +out: + _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); +} +#endif + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + +DEFINE_INTERRUPT_HANDLER(fp_unavailable_tm) +{ + /* Note: This does not handle any kind of FP laziness. */ + + TM_DEBUG("FP Unavailable trap whilst transactional at 0x%lx, MSR=%lx\n", + regs->nip, regs->msr); + + /* We can only have got here if the task started using FP after + * beginning the transaction. So, the transactional regs are just a + * copy of the checkpointed ones. But, we still need to recheckpoint + * as we're enabling FP for the process; it will return, abort the + * transaction, and probably retry but now with FP enabled. So the + * checkpointed FP registers need to be loaded. + */ + tm_reclaim_current(TM_CAUSE_FAC_UNAV); + + /* + * Reclaim initially saved out bogus (lazy) FPRs to ckfp_state, and + * then it was overwrite by the thr->fp_state by tm_reclaim_thread(). + * + * At this point, ck{fp,vr}_state contains the exact values we want to + * recheckpoint. + */ + + /* Enable FP for the task: */ + current->thread.load_fp = 1; + + /* + * Recheckpoint all the checkpointed ckpt, ck{fp, vr}_state registers. + */ + tm_recheckpoint(¤t->thread); +} + +DEFINE_INTERRUPT_HANDLER(altivec_unavailable_tm) +{ + /* See the comments in fp_unavailable_tm(). This function operates + * the same way. + */ + + TM_DEBUG("Vector Unavailable trap whilst transactional at 0x%lx," + "MSR=%lx\n", + regs->nip, regs->msr); + tm_reclaim_current(TM_CAUSE_FAC_UNAV); + current->thread.load_vec = 1; + tm_recheckpoint(¤t->thread); + current->thread.used_vr = 1; +} + +DEFINE_INTERRUPT_HANDLER(vsx_unavailable_tm) +{ + /* See the comments in fp_unavailable_tm(). This works similarly, + * though we're loading both FP and VEC registers in here. + * + * If FP isn't in use, load FP regs. If VEC isn't in use, load VEC + * regs. Either way, set MSR_VSX. + */ + + TM_DEBUG("VSX Unavailable trap whilst transactional at 0x%lx," + "MSR=%lx\n", + regs->nip, regs->msr); + + current->thread.used_vsr = 1; + + /* This reclaims FP and/or VR regs if they're already enabled */ + tm_reclaim_current(TM_CAUSE_FAC_UNAV); + + current->thread.load_vec = 1; + current->thread.load_fp = 1; + + tm_recheckpoint(¤t->thread); +} +#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ + +#ifdef CONFIG_PPC64 +DECLARE_INTERRUPT_HANDLER_NMI(performance_monitor_exception_nmi); +DEFINE_INTERRUPT_HANDLER_NMI(performance_monitor_exception_nmi) +{ + __this_cpu_inc(irq_stat.pmu_irqs); + + perf_irq(regs); + + return 0; +} +#endif + +DECLARE_INTERRUPT_HANDLER_ASYNC(performance_monitor_exception_async); +DEFINE_INTERRUPT_HANDLER_ASYNC(performance_monitor_exception_async) +{ + __this_cpu_inc(irq_stat.pmu_irqs); + + perf_irq(regs); +} + +DEFINE_INTERRUPT_HANDLER_RAW(performance_monitor_exception) +{ + /* + * On 64-bit, if perf interrupts hit in a local_irq_disable + * (soft-masked) region, we consider them as NMIs. This is required to + * prevent hash faults on user addresses when reading callchains (and + * looks better from an irq tracing perspective). + */ + if (IS_ENABLED(CONFIG_PPC64) && unlikely(arch_irq_disabled_regs(regs))) + performance_monitor_exception_nmi(regs); + else + performance_monitor_exception_async(regs); + + return 0; +} + +#ifdef CONFIG_PPC_ADV_DEBUG_REGS +static void handle_debug(struct pt_regs *regs, unsigned long debug_status) +{ + int changed = 0; + /* + * Determine the cause of the debug event, clear the + * event flags and send a trap to the handler. Torez + */ + if (debug_status & (DBSR_DAC1R | DBSR_DAC1W)) { + dbcr_dac(current) &= ~(DBCR_DAC1R | DBCR_DAC1W); +#ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE + current->thread.debug.dbcr2 &= ~DBCR2_DAC12MODE; +#endif + do_send_trap(regs, mfspr(SPRN_DAC1), debug_status, + 5); + changed |= 0x01; + } else if (debug_status & (DBSR_DAC2R | DBSR_DAC2W)) { + dbcr_dac(current) &= ~(DBCR_DAC2R | DBCR_DAC2W); + do_send_trap(regs, mfspr(SPRN_DAC2), debug_status, + 6); + changed |= 0x01; + } else if (debug_status & DBSR_IAC1) { + current->thread.debug.dbcr0 &= ~DBCR0_IAC1; + dbcr_iac_range(current) &= ~DBCR_IAC12MODE; + do_send_trap(regs, mfspr(SPRN_IAC1), debug_status, + 1); + changed |= 0x01; + } else if (debug_status & DBSR_IAC2) { + current->thread.debug.dbcr0 &= ~DBCR0_IAC2; + do_send_trap(regs, mfspr(SPRN_IAC2), debug_status, + 2); + changed |= 0x01; + } else if (debug_status & DBSR_IAC3) { + current->thread.debug.dbcr0 &= ~DBCR0_IAC3; + dbcr_iac_range(current) &= ~DBCR_IAC34MODE; + do_send_trap(regs, mfspr(SPRN_IAC3), debug_status, + 3); + changed |= 0x01; + } else if (debug_status & DBSR_IAC4) { + current->thread.debug.dbcr0 &= ~DBCR0_IAC4; + do_send_trap(regs, mfspr(SPRN_IAC4), debug_status, + 4); + changed |= 0x01; + } + /* + * At the point this routine was called, the MSR(DE) was turned off. + * Check all other debug flags and see if that bit needs to be turned + * back on or not. + */ + if (DBCR_ACTIVE_EVENTS(current->thread.debug.dbcr0, + current->thread.debug.dbcr1)) + regs_set_return_msr(regs, regs->msr | MSR_DE); + else + /* Make sure the IDM flag is off */ + current->thread.debug.dbcr0 &= ~DBCR0_IDM; + + if (changed & 0x01) + mtspr(SPRN_DBCR0, current->thread.debug.dbcr0); +} + +DEFINE_INTERRUPT_HANDLER(DebugException) +{ + unsigned long debug_status = regs->dsisr; + + current->thread.debug.dbsr = debug_status; + + /* Hack alert: On BookE, Branch Taken stops on the branch itself, while + * on server, it stops on the target of the branch. In order to simulate + * the server behaviour, we thus restart right away with a single step + * instead of stopping here when hitting a BT + */ + if (debug_status & DBSR_BT) { + regs_set_return_msr(regs, regs->msr & ~MSR_DE); + + /* Disable BT */ + mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~DBCR0_BT); + /* Clear the BT event */ + mtspr(SPRN_DBSR, DBSR_BT); + + /* Do the single step trick only when coming from userspace */ + if (user_mode(regs)) { + current->thread.debug.dbcr0 &= ~DBCR0_BT; + current->thread.debug.dbcr0 |= DBCR0_IDM | DBCR0_IC; + regs_set_return_msr(regs, regs->msr | MSR_DE); + return; + } + + if (kprobe_post_handler(regs)) + return; + + if (notify_die(DIE_SSTEP, "block_step", regs, 5, + 5, SIGTRAP) == NOTIFY_STOP) { + return; + } + if (debugger_sstep(regs)) + return; + } else if (debug_status & DBSR_IC) { /* Instruction complete */ + regs_set_return_msr(regs, regs->msr & ~MSR_DE); + + /* Disable instruction completion */ + mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~DBCR0_IC); + /* Clear the instruction completion event */ + mtspr(SPRN_DBSR, DBSR_IC); + + if (kprobe_post_handler(regs)) + return; + + if (notify_die(DIE_SSTEP, "single_step", regs, 5, + 5, SIGTRAP) == NOTIFY_STOP) { + return; + } + + if (debugger_sstep(regs)) + return; + + if (user_mode(regs)) { + current->thread.debug.dbcr0 &= ~DBCR0_IC; + if (DBCR_ACTIVE_EVENTS(current->thread.debug.dbcr0, + current->thread.debug.dbcr1)) + regs_set_return_msr(regs, regs->msr | MSR_DE); + else + /* Make sure the IDM bit is off */ + current->thread.debug.dbcr0 &= ~DBCR0_IDM; + } + + _exception(SIGTRAP, regs, TRAP_TRACE, regs->nip); + } else + handle_debug(regs, debug_status); +} +#endif /* CONFIG_PPC_ADV_DEBUG_REGS */ + +#ifdef CONFIG_ALTIVEC +DEFINE_INTERRUPT_HANDLER(altivec_assist_exception) +{ + int err; + + if (!user_mode(regs)) { + printk(KERN_EMERG "VMX/Altivec assist exception in kernel mode" + " at %lx\n", regs->nip); + die("Kernel VMX/Altivec assist exception", regs, SIGILL); + } + + flush_altivec_to_thread(current); + + PPC_WARN_EMULATED(altivec, regs); + err = emulate_altivec(regs); + if (err == 0) { + regs_add_return_ip(regs, 4); /* skip emulated instruction */ + emulate_single_step(regs); + return; + } + + if (err == -EFAULT) { + /* got an error reading the instruction */ + _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip); + } else { + /* didn't recognize the instruction */ + /* XXX quick hack for now: set the non-Java bit in the VSCR */ + printk_ratelimited(KERN_ERR "Unrecognized altivec instruction " + "in %s at %lx\n", current->comm, regs->nip); + current->thread.vr_state.vscr.u[3] |= 0x10000; + } +} +#endif /* CONFIG_ALTIVEC */ + +#ifdef CONFIG_PPC_85xx +DEFINE_INTERRUPT_HANDLER(CacheLockingException) +{ + unsigned long error_code = regs->dsisr; + + /* We treat cache locking instructions from the user + * as priv ops, in the future we could try to do + * something smarter + */ + if (error_code & (ESR_DLK|ESR_ILK)) + _exception(SIGILL, regs, ILL_PRVOPC, regs->nip); + return; +} +#endif /* CONFIG_PPC_85xx */ + +#ifdef CONFIG_SPE +DEFINE_INTERRUPT_HANDLER(SPEFloatingPointException) +{ + unsigned long spefscr; + int fpexc_mode; + int code = FPE_FLTUNK; + int err; + + interrupt_cond_local_irq_enable(regs); + + flush_spe_to_thread(current); + + spefscr = current->thread.spefscr; + fpexc_mode = current->thread.fpexc_mode; + + if ((spefscr & SPEFSCR_FOVF) && (fpexc_mode & PR_FP_EXC_OVF)) { + code = FPE_FLTOVF; + } + else if ((spefscr & SPEFSCR_FUNF) && (fpexc_mode & PR_FP_EXC_UND)) { + code = FPE_FLTUND; + } + else if ((spefscr & SPEFSCR_FDBZ) && (fpexc_mode & PR_FP_EXC_DIV)) + code = FPE_FLTDIV; + else if ((spefscr & SPEFSCR_FINV) && (fpexc_mode & PR_FP_EXC_INV)) { + code = FPE_FLTINV; + } + else if ((spefscr & (SPEFSCR_FG | SPEFSCR_FX)) && (fpexc_mode & PR_FP_EXC_RES)) + code = FPE_FLTRES; + + err = do_spe_mathemu(regs); + if (err == 0) { + regs_add_return_ip(regs, 4); /* skip emulated instruction */ + emulate_single_step(regs); + return; + } + + if (err == -EFAULT) { + /* got an error reading the instruction */ + _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip); + } else if (err == -EINVAL) { + /* didn't recognize the instruction */ + printk(KERN_ERR "unrecognized spe instruction " + "in %s at %lx\n", current->comm, regs->nip); + } else { + _exception(SIGFPE, regs, code, regs->nip); + } + + return; +} + +DEFINE_INTERRUPT_HANDLER(SPEFloatingPointRoundException) +{ + int err; + + interrupt_cond_local_irq_enable(regs); + + preempt_disable(); + if (regs->msr & MSR_SPE) + giveup_spe(current); + preempt_enable(); + + regs_add_return_ip(regs, -4); + err = speround_handler(regs); + if (err == 0) { + regs_add_return_ip(regs, 4); /* skip emulated instruction */ + emulate_single_step(regs); + return; + } + + if (err == -EFAULT) { + /* got an error reading the instruction */ + _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip); + } else if (err == -EINVAL) { + /* didn't recognize the instruction */ + printk(KERN_ERR "unrecognized spe instruction " + "in %s at %lx\n", current->comm, regs->nip); + } else { + _exception(SIGFPE, regs, FPE_FLTUNK, regs->nip); + return; + } +} +#endif + +/* + * We enter here if we get an unrecoverable exception, that is, one + * that happened at a point where the RI (recoverable interrupt) bit + * in the MSR is 0. This indicates that SRR0/1 are live, and that + * we therefore lost state by taking this exception. + */ +void __noreturn unrecoverable_exception(struct pt_regs *regs) +{ + pr_emerg("Unrecoverable exception %lx at %lx (msr=%lx)\n", + regs->trap, regs->nip, regs->msr); + die("Unrecoverable exception", regs, SIGABRT); + /* die() should not return */ + for (;;) + ; +} + +#if defined(CONFIG_BOOKE_WDT) || defined(CONFIG_40x) +/* + * Default handler for a Watchdog exception, + * spins until a reboot occurs + */ +void __attribute__ ((weak)) WatchdogHandler(struct pt_regs *regs) +{ + /* Generic WatchdogHandler, implement your own */ + mtspr(SPRN_TCR, mfspr(SPRN_TCR)&(~TCR_WIE)); + return; +} + +DEFINE_INTERRUPT_HANDLER_NMI(WatchdogException) +{ + printk (KERN_EMERG "PowerPC Book-E Watchdog Exception\n"); + WatchdogHandler(regs); + return 0; +} +#endif + +/* + * We enter here if we discover during exception entry that we are + * running in supervisor mode with a userspace value in the stack pointer. + */ +DEFINE_INTERRUPT_HANDLER(kernel_bad_stack) +{ + printk(KERN_EMERG "Bad kernel stack pointer %lx at %lx\n", + regs->gpr[1], regs->nip); + die("Bad kernel stack pointer", regs, SIGABRT); +} + +#ifdef CONFIG_PPC_EMULATED_STATS + +#define WARN_EMULATED_SETUP(type) .type = { .name = #type } + +struct ppc_emulated ppc_emulated = { +#ifdef CONFIG_ALTIVEC + WARN_EMULATED_SETUP(altivec), +#endif + WARN_EMULATED_SETUP(dcba), + WARN_EMULATED_SETUP(dcbz), + WARN_EMULATED_SETUP(fp_pair), + WARN_EMULATED_SETUP(isel), + WARN_EMULATED_SETUP(mcrxr), + WARN_EMULATED_SETUP(mfpvr), + WARN_EMULATED_SETUP(multiple), + WARN_EMULATED_SETUP(popcntb), + WARN_EMULATED_SETUP(spe), + WARN_EMULATED_SETUP(string), + WARN_EMULATED_SETUP(sync), + WARN_EMULATED_SETUP(unaligned), +#ifdef CONFIG_MATH_EMULATION + WARN_EMULATED_SETUP(math), +#endif +#ifdef CONFIG_VSX + WARN_EMULATED_SETUP(vsx), +#endif +#ifdef CONFIG_PPC64 + WARN_EMULATED_SETUP(mfdscr), + WARN_EMULATED_SETUP(mtdscr), + WARN_EMULATED_SETUP(lq_stq), + WARN_EMULATED_SETUP(lxvw4x), + WARN_EMULATED_SETUP(lxvh8x), + WARN_EMULATED_SETUP(lxvd2x), + WARN_EMULATED_SETUP(lxvb16x), +#endif +}; + +u32 ppc_warn_emulated; + +void ppc_warn_emulated_print(const char *type) +{ + pr_warn_ratelimited("%s used emulated %s instruction\n", current->comm, + type); +} + +static int __init ppc_warn_emulated_init(void) +{ + struct dentry *dir; + unsigned int i; + struct ppc_emulated_entry *entries = (void *)&ppc_emulated; + + dir = debugfs_create_dir("emulated_instructions", + arch_debugfs_dir); + + debugfs_create_u32("do_warn", 0644, dir, &ppc_warn_emulated); + + for (i = 0; i < sizeof(ppc_emulated)/sizeof(*entries); i++) + debugfs_create_u32(entries[i].name, 0644, dir, + (u32 *)&entries[i].val.counter); + + return 0; +} + +device_initcall(ppc_warn_emulated_init); + +#endif /* CONFIG_PPC_EMULATED_STATS */ diff --git a/arch/powerpc/kernel/ucall.S b/arch/powerpc/kernel/ucall.S new file mode 100644 index 000000000..07296bc39 --- /dev/null +++ b/arch/powerpc/kernel/ucall.S @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Generic code to perform an ultravisor call. + * + * Copyright 2019, IBM Corporation. + * + */ +#include <asm/ppc_asm.h> +#include <asm/export.h> + +_GLOBAL(ucall_norets) +EXPORT_SYMBOL_GPL(ucall_norets) + sc 2 /* Invoke the ultravisor */ + blr /* Return r3 = status */ diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c new file mode 100644 index 000000000..92b3fc258 --- /dev/null +++ b/arch/powerpc/kernel/udbg.c @@ -0,0 +1,180 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * polling mode stateless debugging stuff, originally for NS16550 Serial Ports + * + * c 2001 PPC 64 Team, IBM Corp + */ + +#include <linux/stdarg.h> +#include <linux/types.h> +#include <linux/sched.h> +#include <linux/console.h> +#include <linux/init.h> +#include <asm/processor.h> +#include <asm/udbg.h> + +void (*udbg_putc)(char c); +void (*udbg_flush)(void); +int (*udbg_getc)(void); +int (*udbg_getc_poll)(void); + +/* + * Early debugging facilities. You can enable _one_ of these via .config, + * if you do so your kernel _will not boot_ on anything else. Be careful. + */ +void __init udbg_early_init(void) +{ +#if defined(CONFIG_PPC_EARLY_DEBUG_LPAR) + /* For LPAR machines that have an HVC console on vterm 0 */ + udbg_init_debug_lpar(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI) + /* For LPAR machines that have an HVSI console on vterm 0 */ + udbg_init_debug_lpar_hvsi(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_G5) + /* For use on Apple G5 machines */ + udbg_init_pmac_realmode(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_PANEL) + /* RTAS panel debug */ + udbg_init_rtas_panel(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_CONSOLE) + /* RTAS console debug */ + udbg_init_rtas_console(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_MAPLE) + /* Maple real mode debug */ + udbg_init_maple_realmode(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_PAS_REALMODE) + udbg_init_pas_realmode(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_BOOTX) + udbg_init_btext(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_44x) + /* PPC44x debug */ + udbg_init_44x_as1(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_40x) + /* PPC40x debug */ + udbg_init_40x_realmode(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_CPM) + udbg_init_cpm(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_USBGECKO) + udbg_init_usbgecko(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_MEMCONS) + /* In memory console */ + udbg_init_memcons(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_EHV_BC) + udbg_init_ehv_bc(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_PS3GELIC) + udbg_init_ps3gelic(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_RAW) + udbg_init_debug_opal_raw(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI) + udbg_init_debug_opal_hvsi(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_16550) + udbg_init_debug_16550(); +#endif + +#ifdef CONFIG_PPC_EARLY_DEBUG + console_loglevel = CONSOLE_LOGLEVEL_DEBUG; + + register_early_udbg_console(); +#endif +} + +/* udbg library, used by xmon et al */ +void udbg_puts(const char *s) +{ + if (udbg_putc) { + char c; + + if (s && *s != '\0') { + while ((c = *s++) != '\0') + udbg_putc(c); + } + + if (udbg_flush) + udbg_flush(); + } +#if 0 + else { + printk("%s", s); + } +#endif +} + +int udbg_write(const char *s, int n) +{ + int remain = n; + char c; + + if (!udbg_putc) + return 0; + + if (s && *s != '\0') { + while (((c = *s++) != '\0') && (remain-- > 0)) { + udbg_putc(c); + } + } + + if (udbg_flush) + udbg_flush(); + + return n - remain; +} + +#define UDBG_BUFSIZE 256 +void udbg_printf(const char *fmt, ...) +{ + if (udbg_putc) { + char buf[UDBG_BUFSIZE]; + va_list args; + + va_start(args, fmt); + vsnprintf(buf, UDBG_BUFSIZE, fmt, args); + udbg_puts(buf); + va_end(args); + } +} + +void __init udbg_progress(char *s, unsigned short hex) +{ + udbg_puts(s); + udbg_puts("\n"); +} + +/* + * Early boot console based on udbg + */ +static void udbg_console_write(struct console *con, const char *s, + unsigned int n) +{ + udbg_write(s, n); +} + +static struct console udbg_console = { + .name = "udbg", + .write = udbg_console_write, + .flags = CON_PRINTBUFFER | CON_ENABLED | CON_BOOT | CON_ANYTIME, + .index = 0, +}; + +/* + * Called by setup_system after ppc_md->probe and ppc_md->early_init. + * Call it again after setting udbg_putc in ppc_md->setup_arch. + */ +void __init register_early_udbg_console(void) +{ + if (early_console) + return; + + if (!udbg_putc) + return; + + if (strstr(boot_command_line, "udbg-immortal")) { + printk(KERN_INFO "early console immortal !\n"); + udbg_console.flags &= ~CON_BOOT; + } + early_console = &udbg_console; + register_console(&udbg_console); +} + +#if 0 /* if you want to use this as a regular output console */ +console_initcall(register_udbg_console); +#endif diff --git a/arch/powerpc/kernel/udbg_16550.c b/arch/powerpc/kernel/udbg_16550.c new file mode 100644 index 000000000..74ddf836f --- /dev/null +++ b/arch/powerpc/kernel/udbg_16550.c @@ -0,0 +1,331 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * udbg for NS16550 compatible serial ports + * + * Copyright (C) 2001-2005 PPC 64 Team, IBM Corp + */ +#include <linux/types.h> +#include <asm/udbg.h> +#include <asm/io.h> +#include <asm/reg_a2.h> +#include <asm/early_ioremap.h> + +extern u8 real_readb(volatile u8 __iomem *addr); +extern void real_writeb(u8 data, volatile u8 __iomem *addr); +extern u8 real_205_readb(volatile u8 __iomem *addr); +extern void real_205_writeb(u8 data, volatile u8 __iomem *addr); + +#define UART_RBR 0 +#define UART_IER 1 +#define UART_FCR 2 +#define UART_LCR 3 +#define UART_MCR 4 +#define UART_LSR 5 +#define UART_MSR 6 +#define UART_SCR 7 +#define UART_THR UART_RBR +#define UART_IIR UART_FCR +#define UART_DLL UART_RBR +#define UART_DLM UART_IER +#define UART_DLAB UART_LCR + +#define LSR_DR 0x01 /* Data ready */ +#define LSR_OE 0x02 /* Overrun */ +#define LSR_PE 0x04 /* Parity error */ +#define LSR_FE 0x08 /* Framing error */ +#define LSR_BI 0x10 /* Break */ +#define LSR_THRE 0x20 /* Xmit holding register empty */ +#define LSR_TEMT 0x40 /* Xmitter empty */ +#define LSR_ERR 0x80 /* Error */ + +#define LCR_DLAB 0x80 + +static u8 (*udbg_uart_in)(unsigned int reg); +static void (*udbg_uart_out)(unsigned int reg, u8 data); + +static void udbg_uart_flush(void) +{ + if (!udbg_uart_in) + return; + + /* wait for idle */ + while ((udbg_uart_in(UART_LSR) & LSR_THRE) == 0) + cpu_relax(); +} + +static void udbg_uart_putc(char c) +{ + if (!udbg_uart_out) + return; + + if (c == '\n') + udbg_uart_putc('\r'); + udbg_uart_flush(); + udbg_uart_out(UART_THR, c); +} + +static int udbg_uart_getc_poll(void) +{ + if (!udbg_uart_in) + return -1; + + if (!(udbg_uart_in(UART_LSR) & LSR_DR)) + return udbg_uart_in(UART_RBR); + + return -1; +} + +static int udbg_uart_getc(void) +{ + if (!udbg_uart_in) + return -1; + /* wait for char */ + while (!(udbg_uart_in(UART_LSR) & LSR_DR)) + cpu_relax(); + return udbg_uart_in(UART_RBR); +} + +static void __init udbg_use_uart(void) +{ + udbg_putc = udbg_uart_putc; + udbg_flush = udbg_uart_flush; + udbg_getc = udbg_uart_getc; + udbg_getc_poll = udbg_uart_getc_poll; +} + +void __init udbg_uart_setup(unsigned int speed, unsigned int clock) +{ + unsigned int dll, base_bauds; + + if (!udbg_uart_out) + return; + + if (clock == 0) + clock = 1843200; + if (speed == 0) + speed = 9600; + + base_bauds = clock / 16; + dll = base_bauds / speed; + + udbg_uart_out(UART_LCR, 0x00); + udbg_uart_out(UART_IER, 0xff); + udbg_uart_out(UART_IER, 0x00); + udbg_uart_out(UART_LCR, LCR_DLAB); + udbg_uart_out(UART_DLL, dll & 0xff); + udbg_uart_out(UART_DLM, dll >> 8); + /* 8 data, 1 stop, no parity */ + udbg_uart_out(UART_LCR, 0x3); + /* RTS/DTR */ + udbg_uart_out(UART_MCR, 0x3); + /* Clear & enable FIFOs */ + udbg_uart_out(UART_FCR, 0x7); +} + +unsigned int __init udbg_probe_uart_speed(unsigned int clock) +{ + unsigned int dll, dlm, divisor, prescaler, speed; + u8 old_lcr; + + old_lcr = udbg_uart_in(UART_LCR); + + /* select divisor latch registers. */ + udbg_uart_out(UART_LCR, old_lcr | LCR_DLAB); + + /* now, read the divisor */ + dll = udbg_uart_in(UART_DLL); + dlm = udbg_uart_in(UART_DLM); + divisor = dlm << 8 | dll; + + /* check prescaling */ + if (udbg_uart_in(UART_MCR) & 0x80) + prescaler = 4; + else + prescaler = 1; + + /* restore the LCR */ + udbg_uart_out(UART_LCR, old_lcr); + + /* calculate speed */ + speed = (clock / prescaler) / (divisor * 16); + + /* sanity check */ + if (speed > (clock / 16)) + speed = 9600; + + return speed; +} + +static union { + unsigned char __iomem *mmio_base; + unsigned long pio_base; +} udbg_uart; + +static unsigned int udbg_uart_stride = 1; + +static u8 udbg_uart_in_pio(unsigned int reg) +{ + return inb(udbg_uart.pio_base + (reg * udbg_uart_stride)); +} + +static void udbg_uart_out_pio(unsigned int reg, u8 data) +{ + outb(data, udbg_uart.pio_base + (reg * udbg_uart_stride)); +} + +void __init udbg_uart_init_pio(unsigned long port, unsigned int stride) +{ + if (!port) + return; + udbg_uart.pio_base = port; + udbg_uart_stride = stride; + udbg_uart_in = udbg_uart_in_pio; + udbg_uart_out = udbg_uart_out_pio; + udbg_use_uart(); +} + +static u8 udbg_uart_in_mmio(unsigned int reg) +{ + return in_8(udbg_uart.mmio_base + (reg * udbg_uart_stride)); +} + +static void udbg_uart_out_mmio(unsigned int reg, u8 data) +{ + out_8(udbg_uart.mmio_base + (reg * udbg_uart_stride), data); +} + + +void __init udbg_uart_init_mmio(void __iomem *addr, unsigned int stride) +{ + if (!addr) + return; + udbg_uart.mmio_base = addr; + udbg_uart_stride = stride; + udbg_uart_in = udbg_uart_in_mmio; + udbg_uart_out = udbg_uart_out_mmio; + udbg_use_uart(); +} + +#ifdef CONFIG_PPC_MAPLE + +#define UDBG_UART_MAPLE_ADDR ((void __iomem *)0xf40003f8) + +static u8 udbg_uart_in_maple(unsigned int reg) +{ + return real_readb(UDBG_UART_MAPLE_ADDR + reg); +} + +static void udbg_uart_out_maple(unsigned int reg, u8 val) +{ + real_writeb(val, UDBG_UART_MAPLE_ADDR + reg); +} + +void __init udbg_init_maple_realmode(void) +{ + udbg_uart_in = udbg_uart_in_maple; + udbg_uart_out = udbg_uart_out_maple; + udbg_use_uart(); +} + +#endif /* CONFIG_PPC_MAPLE */ + +#ifdef CONFIG_PPC_PASEMI + +#define UDBG_UART_PAS_ADDR ((void __iomem *)0xfcff03f8UL) + +static u8 udbg_uart_in_pas(unsigned int reg) +{ + return real_205_readb(UDBG_UART_PAS_ADDR + reg); +} + +static void udbg_uart_out_pas(unsigned int reg, u8 val) +{ + real_205_writeb(val, UDBG_UART_PAS_ADDR + reg); +} + +void __init udbg_init_pas_realmode(void) +{ + udbg_uart_in = udbg_uart_in_pas; + udbg_uart_out = udbg_uart_out_pas; + udbg_use_uart(); +} + +#endif /* CONFIG_PPC_PASEMI */ + +#ifdef CONFIG_PPC_EARLY_DEBUG_44x + +#include <platforms/44x/44x.h> + +static u8 udbg_uart_in_44x_as1(unsigned int reg) +{ + return as1_readb((void __iomem *)PPC44x_EARLY_DEBUG_VIRTADDR + reg); +} + +static void udbg_uart_out_44x_as1(unsigned int reg, u8 val) +{ + as1_writeb(val, (void __iomem *)PPC44x_EARLY_DEBUG_VIRTADDR + reg); +} + +void __init udbg_init_44x_as1(void) +{ + udbg_uart_in = udbg_uart_in_44x_as1; + udbg_uart_out = udbg_uart_out_44x_as1; + udbg_use_uart(); +} + +#endif /* CONFIG_PPC_EARLY_DEBUG_44x */ + +#ifdef CONFIG_PPC_EARLY_DEBUG_40x + +static u8 udbg_uart_in_40x(unsigned int reg) +{ + return real_readb((void __iomem *)CONFIG_PPC_EARLY_DEBUG_40x_PHYSADDR + + reg); +} + +static void udbg_uart_out_40x(unsigned int reg, u8 val) +{ + real_writeb(val, (void __iomem *)CONFIG_PPC_EARLY_DEBUG_40x_PHYSADDR + + reg); +} + +void __init udbg_init_40x_realmode(void) +{ + udbg_uart_in = udbg_uart_in_40x; + udbg_uart_out = udbg_uart_out_40x; + udbg_use_uart(); +} + +#endif /* CONFIG_PPC_EARLY_DEBUG_40x */ + +#ifdef CONFIG_PPC_EARLY_DEBUG_16550 + +static void __iomem *udbg_uart_early_addr; + +void __init udbg_init_debug_16550(void) +{ + udbg_uart_early_addr = early_ioremap(CONFIG_PPC_EARLY_DEBUG_16550_PHYSADDR, 0x1000); + udbg_uart_init_mmio(udbg_uart_early_addr, CONFIG_PPC_EARLY_DEBUG_16550_STRIDE); +} + +static int __init udbg_init_debug_16550_ioremap(void) +{ + void __iomem *addr; + + if (!udbg_uart_early_addr) + return 0; + + addr = ioremap(CONFIG_PPC_EARLY_DEBUG_16550_PHYSADDR, 0x1000); + if (WARN_ON(!addr)) + return -ENOMEM; + + udbg_uart_init_mmio(addr, CONFIG_PPC_EARLY_DEBUG_16550_STRIDE); + early_iounmap(udbg_uart_early_addr, 0x1000); + udbg_uart_early_addr = NULL; + + return 0; +} + +early_initcall(udbg_init_debug_16550_ioremap); + +#endif /* CONFIG_PPC_EARLY_DEBUG_16550 */ diff --git a/arch/powerpc/kernel/uprobes.c b/arch/powerpc/kernel/uprobes.c new file mode 100644 index 000000000..95a41ae9d --- /dev/null +++ b/arch/powerpc/kernel/uprobes.c @@ -0,0 +1,217 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * User-space Probes (UProbes) for powerpc + * + * Copyright IBM Corporation, 2007-2012 + * + * Adapted from the x86 port by Ananth N Mavinakayanahalli <ananth@in.ibm.com> + */ +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/ptrace.h> +#include <linux/uprobes.h> +#include <linux/uaccess.h> +#include <linux/kdebug.h> + +#include <asm/sstep.h> +#include <asm/inst.h> + +#define UPROBE_TRAP_NR UINT_MAX + +/** + * is_trap_insn - check if the instruction is a trap variant + * @insn: instruction to be checked. + * Returns true if @insn is a trap variant. + */ +bool is_trap_insn(uprobe_opcode_t *insn) +{ + return (is_trap(*insn)); +} + +/** + * arch_uprobe_analyze_insn + * @mm: the probed address space. + * @arch_uprobe: the probepoint information. + * @addr: vaddr to probe. + * Return 0 on success or a -ve number on error. + */ +int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, + struct mm_struct *mm, unsigned long addr) +{ + if (addr & 0x03) + return -EINVAL; + + if (cpu_has_feature(CPU_FTR_ARCH_31) && + ppc_inst_prefixed(ppc_inst_read(auprobe->insn)) && + (addr & 0x3f) == 60) { + pr_info_ratelimited("Cannot register a uprobe on 64 byte unaligned prefixed instruction\n"); + return -EINVAL; + } + + if (!can_single_step(ppc_inst_val(ppc_inst_read(auprobe->insn)))) { + pr_info_ratelimited("Cannot register a uprobe on instructions that can't be single stepped\n"); + return -ENOTSUPP; + } + + return 0; +} + +/* + * arch_uprobe_pre_xol - prepare to execute out of line. + * @auprobe: the probepoint information. + * @regs: reflects the saved user state of current task. + */ +int arch_uprobe_pre_xol(struct arch_uprobe *auprobe, struct pt_regs *regs) +{ + struct arch_uprobe_task *autask = ¤t->utask->autask; + + autask->saved_trap_nr = current->thread.trap_nr; + current->thread.trap_nr = UPROBE_TRAP_NR; + regs_set_return_ip(regs, current->utask->xol_vaddr); + + user_enable_single_step(current); + return 0; +} + +/** + * uprobe_get_swbp_addr - compute address of swbp given post-swbp regs + * @regs: Reflects the saved state of the task after it has hit a breakpoint + * instruction. + * Return the address of the breakpoint instruction. + */ +unsigned long uprobe_get_swbp_addr(struct pt_regs *regs) +{ + return instruction_pointer(regs); +} + +/* + * If xol insn itself traps and generates a signal (SIGILL/SIGSEGV/etc), + * then detect the case where a singlestepped instruction jumps back to its + * own address. It is assumed that anything like do_page_fault/do_trap/etc + * sets thread.trap_nr != UINT_MAX. + * + * arch_uprobe_pre_xol/arch_uprobe_post_xol save/restore thread.trap_nr, + * arch_uprobe_xol_was_trapped() simply checks that ->trap_nr is not equal to + * UPROBE_TRAP_NR == UINT_MAX set by arch_uprobe_pre_xol(). + */ +bool arch_uprobe_xol_was_trapped(struct task_struct *t) +{ + if (t->thread.trap_nr != UPROBE_TRAP_NR) + return true; + + return false; +} + +/* + * Called after single-stepping. To avoid the SMP problems that can + * occur when we temporarily put back the original opcode to + * single-step, we single-stepped a copy of the instruction. + * + * This function prepares to resume execution after the single-step. + */ +int arch_uprobe_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs) +{ + struct uprobe_task *utask = current->utask; + + WARN_ON_ONCE(current->thread.trap_nr != UPROBE_TRAP_NR); + + current->thread.trap_nr = utask->autask.saved_trap_nr; + + /* + * On powerpc, except for loads and stores, most instructions + * including ones that alter code flow (branches, calls, returns) + * are emulated in the kernel. We get here only if the emulation + * support doesn't exist and have to fix-up the next instruction + * to be executed. + */ + regs_set_return_ip(regs, (unsigned long)ppc_inst_next((void *)utask->vaddr, auprobe->insn)); + + user_disable_single_step(current); + return 0; +} + +/* callback routine for handling exceptions. */ +int arch_uprobe_exception_notify(struct notifier_block *self, + unsigned long val, void *data) +{ + struct die_args *args = data; + struct pt_regs *regs = args->regs; + + /* regs == NULL is a kernel bug */ + if (WARN_ON(!regs)) + return NOTIFY_DONE; + + /* We are only interested in userspace traps */ + if (!user_mode(regs)) + return NOTIFY_DONE; + + switch (val) { + case DIE_BPT: + if (uprobe_pre_sstep_notifier(regs)) + return NOTIFY_STOP; + break; + case DIE_SSTEP: + if (uprobe_post_sstep_notifier(regs)) + return NOTIFY_STOP; + break; + default: + break; + } + return NOTIFY_DONE; +} + +/* + * This function gets called when XOL instruction either gets trapped or + * the thread has a fatal signal, so reset the instruction pointer to its + * probed address. + */ +void arch_uprobe_abort_xol(struct arch_uprobe *auprobe, struct pt_regs *regs) +{ + struct uprobe_task *utask = current->utask; + + current->thread.trap_nr = utask->autask.saved_trap_nr; + instruction_pointer_set(regs, utask->vaddr); + + user_disable_single_step(current); +} + +/* + * See if the instruction can be emulated. + * Returns true if instruction was emulated, false otherwise. + */ +bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs) +{ + int ret; + + /* + * emulate_step() returns 1 if the insn was successfully emulated. + * For all other cases, we need to single-step in hardware. + */ + ret = emulate_step(regs, ppc_inst_read(auprobe->insn)); + if (ret > 0) + return true; + + return false; +} + +unsigned long +arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, struct pt_regs *regs) +{ + unsigned long orig_ret_vaddr; + + orig_ret_vaddr = regs->link; + + /* Replace the return addr with trampoline addr */ + regs->link = trampoline_vaddr; + + return orig_ret_vaddr; +} + +bool arch_uretprobe_is_alive(struct return_instance *ret, enum rp_check ctx, + struct pt_regs *regs) +{ + if (ctx == RP_CHECK_CHAIN_CALL) + return regs->gpr[1] <= ret->stack; + else + return regs->gpr[1] < ret->stack; +} diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c new file mode 100644 index 000000000..4abc01949 --- /dev/null +++ b/arch/powerpc/kernel/vdso.c @@ -0,0 +1,402 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +/* + * Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp. + * <benh@kernel.crashing.org> + */ + +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/stddef.h> +#include <linux/unistd.h> +#include <linux/slab.h> +#include <linux/user.h> +#include <linux/elf.h> +#include <linux/security.h> +#include <linux/memblock.h> +#include <linux/syscalls.h> +#include <linux/time_namespace.h> +#include <vdso/datapage.h> + +#include <asm/syscall.h> +#include <asm/processor.h> +#include <asm/mmu.h> +#include <asm/mmu_context.h> +#include <asm/machdep.h> +#include <asm/cputable.h> +#include <asm/sections.h> +#include <asm/firmware.h> +#include <asm/vdso.h> +#include <asm/vdso_datapage.h> +#include <asm/setup.h> + +/* The alignment of the vDSO */ +#define VDSO_ALIGNMENT (1 << 16) + +extern char vdso32_start, vdso32_end; +extern char vdso64_start, vdso64_end; + +long sys_ni_syscall(void); + +/* + * The vdso data page (aka. systemcfg for old ppc64 fans) is here. + * Once the early boot kernel code no longer needs to muck around + * with it, it will become dynamically allocated + */ +static union { + struct vdso_arch_data data; + u8 page[PAGE_SIZE]; +} vdso_data_store __page_aligned_data; +struct vdso_arch_data *vdso_data = &vdso_data_store.data; + +enum vvar_pages { + VVAR_DATA_PAGE_OFFSET, + VVAR_TIMENS_PAGE_OFFSET, + VVAR_NR_PAGES, +}; + +static int vdso_mremap(const struct vm_special_mapping *sm, struct vm_area_struct *new_vma, + unsigned long text_size) +{ + unsigned long new_size = new_vma->vm_end - new_vma->vm_start; + + if (new_size != text_size) + return -EINVAL; + + current->mm->context.vdso = (void __user *)new_vma->vm_start; + + return 0; +} + +static int vdso32_mremap(const struct vm_special_mapping *sm, struct vm_area_struct *new_vma) +{ + return vdso_mremap(sm, new_vma, &vdso32_end - &vdso32_start); +} + +static int vdso64_mremap(const struct vm_special_mapping *sm, struct vm_area_struct *new_vma) +{ + return vdso_mremap(sm, new_vma, &vdso64_end - &vdso64_start); +} + +static vm_fault_t vvar_fault(const struct vm_special_mapping *sm, + struct vm_area_struct *vma, struct vm_fault *vmf); + +static struct vm_special_mapping vvar_spec __ro_after_init = { + .name = "[vvar]", + .fault = vvar_fault, +}; + +static struct vm_special_mapping vdso32_spec __ro_after_init = { + .name = "[vdso]", + .mremap = vdso32_mremap, +}; + +static struct vm_special_mapping vdso64_spec __ro_after_init = { + .name = "[vdso]", + .mremap = vdso64_mremap, +}; + +#ifdef CONFIG_TIME_NS +struct vdso_data *arch_get_vdso_data(void *vvar_page) +{ + return ((struct vdso_arch_data *)vvar_page)->data; +} + +/* + * The vvar mapping contains data for a specific time namespace, so when a task + * changes namespace we must unmap its vvar data for the old namespace. + * Subsequent faults will map in data for the new namespace. + * + * For more details see timens_setup_vdso_data(). + */ +int vdso_join_timens(struct task_struct *task, struct time_namespace *ns) +{ + struct mm_struct *mm = task->mm; + VMA_ITERATOR(vmi, mm, 0); + struct vm_area_struct *vma; + + mmap_read_lock(mm); + for_each_vma(vmi, vma) { + unsigned long size = vma->vm_end - vma->vm_start; + + if (vma_is_special_mapping(vma, &vvar_spec)) + zap_page_range(vma, vma->vm_start, size); + } + mmap_read_unlock(mm); + + return 0; +} + +static struct page *find_timens_vvar_page(struct vm_area_struct *vma) +{ + if (likely(vma->vm_mm == current->mm)) + return current->nsproxy->time_ns->vvar_page; + + /* + * VM_PFNMAP | VM_IO protect .fault() handler from being called + * through interfaces like /proc/$pid/mem or + * process_vm_{readv,writev}() as long as there's no .access() + * in special_mapping_vmops. + * For more details check_vma_flags() and __access_remote_vm() + */ + WARN(1, "vvar_page accessed remotely"); + + return NULL; +} +#else +static struct page *find_timens_vvar_page(struct vm_area_struct *vma) +{ + return NULL; +} +#endif + +static vm_fault_t vvar_fault(const struct vm_special_mapping *sm, + struct vm_area_struct *vma, struct vm_fault *vmf) +{ + struct page *timens_page = find_timens_vvar_page(vma); + unsigned long pfn; + + switch (vmf->pgoff) { + case VVAR_DATA_PAGE_OFFSET: + if (timens_page) + pfn = page_to_pfn(timens_page); + else + pfn = virt_to_pfn(vdso_data); + break; +#ifdef CONFIG_TIME_NS + case VVAR_TIMENS_PAGE_OFFSET: + /* + * If a task belongs to a time namespace then a namespace + * specific VVAR is mapped with the VVAR_DATA_PAGE_OFFSET and + * the real VVAR page is mapped with the VVAR_TIMENS_PAGE_OFFSET + * offset. + * See also the comment near timens_setup_vdso_data(). + */ + if (!timens_page) + return VM_FAULT_SIGBUS; + pfn = virt_to_pfn(vdso_data); + break; +#endif /* CONFIG_TIME_NS */ + default: + return VM_FAULT_SIGBUS; + } + + return vmf_insert_pfn(vma, vmf->address, pfn); +} + +/* + * This is called from binfmt_elf, we create the special vma for the + * vDSO and insert it into the mm struct tree + */ +static int __arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) +{ + unsigned long vdso_size, vdso_base, mappings_size; + struct vm_special_mapping *vdso_spec; + unsigned long vvar_size = VVAR_NR_PAGES * PAGE_SIZE; + struct mm_struct *mm = current->mm; + struct vm_area_struct *vma; + + if (is_32bit_task()) { + vdso_spec = &vdso32_spec; + vdso_size = &vdso32_end - &vdso32_start; + } else { + vdso_spec = &vdso64_spec; + vdso_size = &vdso64_end - &vdso64_start; + } + + mappings_size = vdso_size + vvar_size; + mappings_size += (VDSO_ALIGNMENT - 1) & PAGE_MASK; + + /* + * Pick a base address for the vDSO in process space. + * Add enough to the size so that the result can be aligned. + */ + vdso_base = get_unmapped_area(NULL, 0, mappings_size, 0, 0); + if (IS_ERR_VALUE(vdso_base)) + return vdso_base; + + /* Add required alignment. */ + vdso_base = ALIGN(vdso_base, VDSO_ALIGNMENT); + + /* + * Put vDSO base into mm struct. We need to do this before calling + * install_special_mapping or the perf counter mmap tracking code + * will fail to recognise it as a vDSO. + */ + mm->context.vdso = (void __user *)vdso_base + vvar_size; + + vma = _install_special_mapping(mm, vdso_base, vvar_size, + VM_READ | VM_MAYREAD | VM_IO | + VM_DONTDUMP | VM_PFNMAP, &vvar_spec); + if (IS_ERR(vma)) + return PTR_ERR(vma); + + /* + * our vma flags don't have VM_WRITE so by default, the process isn't + * allowed to write those pages. + * gdb can break that with ptrace interface, and thus trigger COW on + * those pages but it's then your responsibility to never do that on + * the "data" page of the vDSO or you'll stop getting kernel updates + * and your nice userland gettimeofday will be totally dead. + * It's fine to use that for setting breakpoints in the vDSO code + * pages though. + */ + vma = _install_special_mapping(mm, vdso_base + vvar_size, vdso_size, + VM_READ | VM_EXEC | VM_MAYREAD | + VM_MAYWRITE | VM_MAYEXEC, vdso_spec); + if (IS_ERR(vma)) + do_munmap(mm, vdso_base, vvar_size, NULL); + + return PTR_ERR_OR_ZERO(vma); +} + +int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) +{ + struct mm_struct *mm = current->mm; + int rc; + + mm->context.vdso = NULL; + + if (mmap_write_lock_killable(mm)) + return -EINTR; + + rc = __arch_setup_additional_pages(bprm, uses_interp); + if (rc) + mm->context.vdso = NULL; + + mmap_write_unlock(mm); + return rc; +} + +#define VDSO_DO_FIXUPS(type, value, bits, sec) do { \ + void *__start = (void *)VDSO##bits##_SYMBOL(&vdso##bits##_start, sec##_start); \ + void *__end = (void *)VDSO##bits##_SYMBOL(&vdso##bits##_start, sec##_end); \ + \ + do_##type##_fixups((value), __start, __end); \ +} while (0) + +static void __init vdso_fixup_features(void) +{ +#ifdef CONFIG_PPC64 + VDSO_DO_FIXUPS(feature, cur_cpu_spec->cpu_features, 64, ftr_fixup); + VDSO_DO_FIXUPS(feature, cur_cpu_spec->mmu_features, 64, mmu_ftr_fixup); + VDSO_DO_FIXUPS(feature, powerpc_firmware_features, 64, fw_ftr_fixup); + VDSO_DO_FIXUPS(lwsync, cur_cpu_spec->cpu_features, 64, lwsync_fixup); +#endif /* CONFIG_PPC64 */ + +#ifdef CONFIG_VDSO32 + VDSO_DO_FIXUPS(feature, cur_cpu_spec->cpu_features, 32, ftr_fixup); + VDSO_DO_FIXUPS(feature, cur_cpu_spec->mmu_features, 32, mmu_ftr_fixup); +#ifdef CONFIG_PPC64 + VDSO_DO_FIXUPS(feature, powerpc_firmware_features, 32, fw_ftr_fixup); +#endif /* CONFIG_PPC64 */ + VDSO_DO_FIXUPS(lwsync, cur_cpu_spec->cpu_features, 32, lwsync_fixup); +#endif +} + +/* + * Called from setup_arch to initialize the bitmap of available + * syscalls in the systemcfg page + */ +static void __init vdso_setup_syscall_map(void) +{ + unsigned int i; + + for (i = 0; i < NR_syscalls; i++) { + if (sys_call_table[i] != (void *)&sys_ni_syscall) + vdso_data->syscall_map[i >> 5] |= 0x80000000UL >> (i & 0x1f); + if (IS_ENABLED(CONFIG_COMPAT) && + compat_sys_call_table[i] != (void *)&sys_ni_syscall) + vdso_data->compat_syscall_map[i >> 5] |= 0x80000000UL >> (i & 0x1f); + } +} + +#ifdef CONFIG_PPC64 +int vdso_getcpu_init(void) +{ + unsigned long cpu, node, val; + + /* + * SPRG_VDSO contains the CPU in the bottom 16 bits and the NUMA node + * in the next 16 bits. The VDSO uses this to implement getcpu(). + */ + cpu = get_cpu(); + WARN_ON_ONCE(cpu > 0xffff); + + node = cpu_to_node(cpu); + WARN_ON_ONCE(node > 0xffff); + + val = (cpu & 0xffff) | ((node & 0xffff) << 16); + mtspr(SPRN_SPRG_VDSO_WRITE, val); + get_paca()->sprg_vdso = val; + + put_cpu(); + + return 0; +} +/* We need to call this before SMP init */ +early_initcall(vdso_getcpu_init); +#endif + +static struct page ** __init vdso_setup_pages(void *start, void *end) +{ + int i; + struct page **pagelist; + int pages = (end - start) >> PAGE_SHIFT; + + pagelist = kcalloc(pages + 1, sizeof(struct page *), GFP_KERNEL); + if (!pagelist) + panic("%s: Cannot allocate page list for VDSO", __func__); + + for (i = 0; i < pages; i++) + pagelist[i] = virt_to_page(start + i * PAGE_SIZE); + + return pagelist; +} + +static int __init vdso_init(void) +{ +#ifdef CONFIG_PPC64 + /* + * Fill up the "systemcfg" stuff for backward compatibility + */ + strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64"); + vdso_data->version.major = SYSTEMCFG_MAJOR; + vdso_data->version.minor = SYSTEMCFG_MINOR; + vdso_data->processor = mfspr(SPRN_PVR); + /* + * Fake the old platform number for pSeries and add + * in LPAR bit if necessary + */ + vdso_data->platform = 0x100; + if (firmware_has_feature(FW_FEATURE_LPAR)) + vdso_data->platform |= 1; + vdso_data->physicalMemorySize = memblock_phys_mem_size(); + vdso_data->dcache_size = ppc64_caches.l1d.size; + vdso_data->dcache_line_size = ppc64_caches.l1d.line_size; + vdso_data->icache_size = ppc64_caches.l1i.size; + vdso_data->icache_line_size = ppc64_caches.l1i.line_size; + vdso_data->dcache_block_size = ppc64_caches.l1d.block_size; + vdso_data->icache_block_size = ppc64_caches.l1i.block_size; + vdso_data->dcache_log_block_size = ppc64_caches.l1d.log_block_size; + vdso_data->icache_log_block_size = ppc64_caches.l1i.log_block_size; +#endif /* CONFIG_PPC64 */ + + vdso_setup_syscall_map(); + + vdso_fixup_features(); + + if (IS_ENABLED(CONFIG_VDSO32)) + vdso32_spec.pages = vdso_setup_pages(&vdso32_start, &vdso32_end); + + if (IS_ENABLED(CONFIG_PPC64)) + vdso64_spec.pages = vdso_setup_pages(&vdso64_start, &vdso64_end); + + smp_wmb(); + + return 0; +} +arch_initcall(vdso_init); diff --git a/arch/powerpc/kernel/vdso/.gitignore b/arch/powerpc/kernel/vdso/.gitignore new file mode 100644 index 000000000..dd9bdd677 --- /dev/null +++ b/arch/powerpc/kernel/vdso/.gitignore @@ -0,0 +1,5 @@ +# SPDX-License-Identifier: GPL-2.0-only +vdso32.lds +vdso32.so.dbg +vdso64.lds +vdso64.so.dbg diff --git a/arch/powerpc/kernel/vdso/Makefile b/arch/powerpc/kernel/vdso/Makefile new file mode 100644 index 000000000..a2e7b0ce5 --- /dev/null +++ b/arch/powerpc/kernel/vdso/Makefile @@ -0,0 +1,104 @@ +# SPDX-License-Identifier: GPL-2.0 + +# List of files in the vdso, has to be asm only for now + +ARCH_REL_TYPE_ABS := R_PPC_JUMP_SLOT|R_PPC_GLOB_DAT|R_PPC_ADDR32|R_PPC_ADDR24|R_PPC_ADDR16|R_PPC_ADDR16_LO|R_PPC_ADDR16_HI|R_PPC_ADDR16_HA|R_PPC_ADDR14|R_PPC_ADDR14_BRTAKEN|R_PPC_ADDR14_BRNTAKEN|R_PPC_REL24 +include $(srctree)/lib/vdso/Makefile + +obj-vdso32 = sigtramp32-32.o gettimeofday-32.o datapage-32.o cacheflush-32.o note-32.o getcpu-32.o +obj-vdso64 = sigtramp64-64.o gettimeofday-64.o datapage-64.o cacheflush-64.o note-64.o getcpu-64.o + +ifneq ($(c-gettimeofday-y),) + CFLAGS_vgettimeofday-32.o += -include $(c-gettimeofday-y) + CFLAGS_vgettimeofday-32.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) + CFLAGS_vgettimeofday-32.o += $(call cc-option, -fno-stack-protector) + CFLAGS_vgettimeofday-32.o += -DDISABLE_BRANCH_PROFILING + CFLAGS_vgettimeofday-32.o += -ffreestanding -fasynchronous-unwind-tables + CFLAGS_REMOVE_vgettimeofday-32.o = $(CC_FLAGS_FTRACE) + CFLAGS_REMOVE_vgettimeofday-32.o += -mcmodel=medium -mabi=elfv1 -mabi=elfv2 -mcall-aixdesc + CFLAGS_vgettimeofday-64.o += -include $(c-gettimeofday-y) + CFLAGS_vgettimeofday-64.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) + CFLAGS_vgettimeofday-64.o += $(call cc-option, -fno-stack-protector) + CFLAGS_vgettimeofday-64.o += -DDISABLE_BRANCH_PROFILING + CFLAGS_vgettimeofday-64.o += -ffreestanding -fasynchronous-unwind-tables + CFLAGS_REMOVE_vgettimeofday-64.o = $(CC_FLAGS_FTRACE) +# Go prior to 1.16.x assumes r30 is not clobbered by any VDSO code. That used to be true +# by accident when the VDSO was hand-written asm code, but may not be now that the VDSO is +# compiler generated. To avoid breaking Go tell GCC not to use r30. Impact on code +# generation is minimal, it will just use r29 instead. + CFLAGS_vgettimeofday-64.o += $(call cc-option, -ffixed-r30) +endif + +# Build rules + +ifdef CROSS32_COMPILE + VDSOCC := $(CROSS32_COMPILE)gcc +else + VDSOCC := $(CC) +endif + +targets := $(obj-vdso32) vdso32.so.dbg vgettimeofday-32.o +obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32)) +targets += $(obj-vdso64) vdso64.so.dbg vgettimeofday-64.o +obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64)) + +GCOV_PROFILE := n +KCOV_INSTRUMENT := n +UBSAN_SANITIZE := n +KASAN_SANITIZE := n + +ccflags-y := -shared -fno-common -fno-builtin -nostdlib -Wl,--hash-style=both +ccflags-$(CONFIG_LD_IS_LLD) += $(call cc-option,--ld-path=$(LD),-fuse-ld=lld) + +CC32FLAGS := -Wl,-soname=linux-vdso32.so.1 -m32 +AS32FLAGS := -D__VDSO32__ -s + +CC64FLAGS := -Wl,-soname=linux-vdso64.so.1 +AS64FLAGS := -D__VDSO64__ -s + +targets += vdso32.lds +CPPFLAGS_vdso32.lds += -P -C -Upowerpc +targets += vdso64.lds +CPPFLAGS_vdso64.lds += -P -C -U$(ARCH) + +# link rule for the .so file, .lds has to be first +$(obj)/vdso32.so.dbg: $(src)/vdso32.lds $(obj-vdso32) $(obj)/vgettimeofday-32.o FORCE + $(call if_changed,vdso32ld_and_check) +$(obj)/vdso64.so.dbg: $(src)/vdso64.lds $(obj-vdso64) $(obj)/vgettimeofday-64.o FORCE + $(call if_changed,vdso64ld_and_check) + +# assembly rules for the .S files +$(obj-vdso32): %-32.o: %.S FORCE + $(call if_changed_dep,vdso32as) +$(obj)/vgettimeofday-32.o: %-32.o: %.c FORCE + $(call if_changed_dep,vdso32cc) +$(obj-vdso64): %-64.o: %.S FORCE + $(call if_changed_dep,vdso64as) +$(obj)/vgettimeofday-64.o: %-64.o: %.c FORCE + $(call if_changed_dep,cc_o_c) + +# Generate VDSO offsets using helper script +gen-vdso32sym := $(srctree)/$(src)/gen_vdso32_offsets.sh +quiet_cmd_vdso32sym = VDSO32SYM $@ + cmd_vdso32sym = $(NM) $< | $(gen-vdso32sym) | LC_ALL=C sort > $@ +gen-vdso64sym := $(srctree)/$(src)/gen_vdso64_offsets.sh +quiet_cmd_vdso64sym = VDSO64SYM $@ + cmd_vdso64sym = $(NM) $< | $(gen-vdso64sym) | LC_ALL=C sort > $@ + +include/generated/vdso32-offsets.h: $(obj)/vdso32.so.dbg FORCE + $(call if_changed,vdso32sym) +include/generated/vdso64-offsets.h: $(obj)/vdso64.so.dbg FORCE + $(call if_changed,vdso64sym) + +# actual build commands +quiet_cmd_vdso32ld_and_check = VDSO32L $@ + cmd_vdso32ld_and_check = $(VDSOCC) $(c_flags) $(CC32FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^) -z noexecstack ; $(cmd_vdso_check) +quiet_cmd_vdso32as = VDSO32A $@ + cmd_vdso32as = $(VDSOCC) $(a_flags) $(CC32FLAGS) $(AS32FLAGS) -c -o $@ $< +quiet_cmd_vdso32cc = VDSO32C $@ + cmd_vdso32cc = $(VDSOCC) $(c_flags) $(CC32FLAGS) -c -o $@ $< + +quiet_cmd_vdso64ld_and_check = VDSO64L $@ + cmd_vdso64ld_and_check = $(VDSOCC) $(c_flags) $(CC64FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^) -z noexecstack ; $(cmd_vdso_check) +quiet_cmd_vdso64as = VDSO64A $@ + cmd_vdso64as = $(VDSOCC) $(a_flags) $(CC64FLAGS) $(AS64FLAGS) -c -o $@ $< diff --git a/arch/powerpc/kernel/vdso/cacheflush.S b/arch/powerpc/kernel/vdso/cacheflush.S new file mode 100644 index 000000000..0085ae464 --- /dev/null +++ b/arch/powerpc/kernel/vdso/cacheflush.S @@ -0,0 +1,99 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * vDSO provided cache flush routines + * + * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org), + * IBM Corp. + */ +#include <asm/processor.h> +#include <asm/ppc_asm.h> +#include <asm/vdso.h> +#include <asm/vdso_datapage.h> +#include <asm/asm-offsets.h> +#include <asm/cache.h> + + .text + +/* + * Default "generic" version of __kernel_sync_dicache. + * + * void __kernel_sync_dicache(unsigned long start, unsigned long end) + * + * Flushes the data cache & invalidate the instruction cache for the + * provided range [start, end[ + */ +V_FUNCTION_BEGIN(__kernel_sync_dicache) + .cfi_startproc +BEGIN_FTR_SECTION + b 3f +END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE) +#ifdef CONFIG_PPC64 + mflr r12 + .cfi_register lr,r12 + get_datapage r10 + mtlr r12 + .cfi_restore lr +#endif + +#ifdef CONFIG_PPC64 + lwz r7,CFG_DCACHE_BLOCKSZ(r10) + addi r5,r7,-1 +#else + li r5, L1_CACHE_BYTES - 1 +#endif + andc r6,r3,r5 /* round low to line bdy */ + subf r8,r6,r4 /* compute length */ + add r8,r8,r5 /* ensure we get enough */ +#ifdef CONFIG_PPC64 + lwz r9,CFG_DCACHE_LOGBLOCKSZ(r10) + PPC_SRL. r8,r8,r9 /* compute line count */ +#else + srwi. r8, r8, L1_CACHE_SHIFT + mr r7, r6 +#endif + crclr cr0*4+so + beqlr /* nothing to do? */ + mtctr r8 +1: dcbst 0,r6 +#ifdef CONFIG_PPC64 + add r6,r6,r7 +#else + addi r6, r6, L1_CACHE_BYTES +#endif + bdnz 1b + sync + +/* Now invalidate the instruction cache */ + +#ifdef CONFIG_PPC64 + lwz r7,CFG_ICACHE_BLOCKSZ(r10) + addi r5,r7,-1 + andc r6,r3,r5 /* round low to line bdy */ + subf r8,r6,r4 /* compute length */ + add r8,r8,r5 + lwz r9,CFG_ICACHE_LOGBLOCKSZ(r10) + PPC_SRL. r8,r8,r9 /* compute line count */ + crclr cr0*4+so + beqlr /* nothing to do? */ +#endif + mtctr r8 +#ifdef CONFIG_PPC64 +2: icbi 0,r6 + add r6,r6,r7 +#else +2: icbi 0, r7 + addi r7, r7, L1_CACHE_BYTES +#endif + bdnz 2b + isync + li r3,0 + blr +3: + crclr cr0*4+so + sync + icbi 0,r1 + isync + li r3,0 + blr + .cfi_endproc +V_FUNCTION_END(__kernel_sync_dicache) diff --git a/arch/powerpc/kernel/vdso/datapage.S b/arch/powerpc/kernel/vdso/datapage.S new file mode 100644 index 000000000..db8e167f0 --- /dev/null +++ b/arch/powerpc/kernel/vdso/datapage.S @@ -0,0 +1,64 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Access to the shared data page by the vDSO & syscall map + * + * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org), IBM Corp. + */ + +#include <asm/processor.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/unistd.h> +#include <asm/vdso.h> +#include <asm/vdso_datapage.h> + + .text + +/* + * void *__kernel_get_syscall_map(unsigned int *syscall_count) ; + * + * returns a pointer to the syscall map. the map is agnostic to the + * size of "long", unlike kernel bitops, it stores bits from top to + * bottom so that memory actually contains a linear bitmap + * check for syscall N by testing bit (0x80000000 >> (N & 0x1f)) of + * 32 bits int at N >> 5. + */ +V_FUNCTION_BEGIN(__kernel_get_syscall_map) + .cfi_startproc + mflr r12 + .cfi_register lr,r12 + mr. r4,r3 + get_datapage r3 + mtlr r12 +#ifdef __powerpc64__ + addi r3,r3,CFG_SYSCALL_MAP64 +#else + addi r3,r3,CFG_SYSCALL_MAP32 +#endif + crclr cr0*4+so + beqlr + li r0,NR_syscalls + stw r0,0(r4) + blr + .cfi_endproc +V_FUNCTION_END(__kernel_get_syscall_map) + +/* + * void unsigned long long __kernel_get_tbfreq(void); + * + * returns the timebase frequency in HZ + */ +V_FUNCTION_BEGIN(__kernel_get_tbfreq) + .cfi_startproc + mflr r12 + .cfi_register lr,r12 + get_datapage r3 +#ifndef __powerpc64__ + lwz r4,(CFG_TB_TICKS_PER_SEC + 4)(r3) +#endif + PPC_LL r3,CFG_TB_TICKS_PER_SEC(r3) + mtlr r12 + crclr cr0*4+so + blr + .cfi_endproc +V_FUNCTION_END(__kernel_get_tbfreq) diff --git a/arch/powerpc/kernel/vdso/gen_vdso32_offsets.sh b/arch/powerpc/kernel/vdso/gen_vdso32_offsets.sh new file mode 100755 index 000000000..c7b54a5dc --- /dev/null +++ b/arch/powerpc/kernel/vdso/gen_vdso32_offsets.sh @@ -0,0 +1,16 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 + +# +# Match symbols in the DSO that look like VDSO_*; produce a header file +# of constant offsets into the shared object. +# +# Doing this inside the Makefile will break the $(filter-out) function, +# causing Kbuild to rebuild the vdso-offsets header file every time. +# +# Author: Will Deacon <will.deacon@arm.com +# + +LC_ALL=C +sed -n -e 's/^00*/0/' -e \ +'s/^\([0-9a-fA-F]*\) . VDSO_\([a-zA-Z0-9_]*\)$/\#define vdso32_offset_\2\t0x\1/p' diff --git a/arch/powerpc/kernel/vdso/gen_vdso64_offsets.sh b/arch/powerpc/kernel/vdso/gen_vdso64_offsets.sh new file mode 100755 index 000000000..4bf15ffd5 --- /dev/null +++ b/arch/powerpc/kernel/vdso/gen_vdso64_offsets.sh @@ -0,0 +1,16 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 + +# +# Match symbols in the DSO that look like VDSO_*; produce a header file +# of constant offsets into the shared object. +# +# Doing this inside the Makefile will break the $(filter-out) function, +# causing Kbuild to rebuild the vdso-offsets header file every time. +# +# Author: Will Deacon <will.deacon@arm.com +# + +LC_ALL=C +sed -n -e 's/^00*/0/' -e \ +'s/^\([0-9a-fA-F]*\) . VDSO_\([a-zA-Z0-9_]*\)$/\#define vdso64_offset_\2\t0x\1/p' diff --git a/arch/powerpc/kernel/vdso/getcpu.S b/arch/powerpc/kernel/vdso/getcpu.S new file mode 100644 index 000000000..8e08ccf19 --- /dev/null +++ b/arch/powerpc/kernel/vdso/getcpu.S @@ -0,0 +1,50 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * + * Copyright (C) IBM Corporation, 2012 + * + * Author: Anton Blanchard <anton@au.ibm.com> + */ +#include <asm/ppc_asm.h> +#include <asm/vdso.h> + + .text +/* + * Exact prototype of getcpu + * + * int __kernel_getcpu(unsigned *cpu, unsigned *node); + * + */ +#if defined(CONFIG_PPC64) +V_FUNCTION_BEGIN(__kernel_getcpu) + .cfi_startproc + mfspr r5,SPRN_SPRG_VDSO_READ + PPC_LCMPI cr0,r3,0 + PPC_LCMPI cr1,r4,0 + clrlwi r6,r5,16 + rlwinm r7,r5,16,31-15,31-0 + beq cr0,1f + stw r6,0(r3) +1: crclr cr0*4+so + li r3,0 /* always success */ + beqlr cr1 + stw r7,0(r4) + blr + .cfi_endproc +V_FUNCTION_END(__kernel_getcpu) +#elif !defined(CONFIG_SMP) +V_FUNCTION_BEGIN(__kernel_getcpu) + .cfi_startproc + cmpwi cr0, r3, 0 + cmpwi cr1, r4, 0 + li r5, 0 + beq cr0, 1f + stw r5, 0(r3) +1: li r3, 0 /* always success */ + crclr cr0*4+so + beqlr cr1 + stw r5, 0(r4) + blr + .cfi_endproc +V_FUNCTION_END(__kernel_getcpu) +#endif diff --git a/arch/powerpc/kernel/vdso/gettimeofday.S b/arch/powerpc/kernel/vdso/gettimeofday.S new file mode 100644 index 000000000..0c4ecc8fe --- /dev/null +++ b/arch/powerpc/kernel/vdso/gettimeofday.S @@ -0,0 +1,129 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Userland implementation of gettimeofday() for processes + * for use in the vDSO + * + * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org, + * IBM Corp. + */ +#include <asm/processor.h> +#include <asm/ppc_asm.h> +#include <asm/vdso.h> +#include <asm/vdso_datapage.h> +#include <asm/asm-offsets.h> +#include <asm/unistd.h> + +/* + * The macro sets two stack frames, one for the caller and one for the callee + * because there are no requirement for the caller to set a stack frame when + * calling VDSO so it may have omitted to set one, especially on PPC64 + */ + +.macro cvdso_call funct call_time=0 + .cfi_startproc + PPC_STLU r1, -PPC_MIN_STKFRM(r1) + .cfi_adjust_cfa_offset PPC_MIN_STKFRM + mflr r0 + PPC_STLU r1, -PPC_MIN_STKFRM(r1) + .cfi_adjust_cfa_offset PPC_MIN_STKFRM + PPC_STL r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1) + .cfi_rel_offset lr, PPC_MIN_STKFRM + PPC_LR_STKOFF +#ifdef __powerpc64__ + PPC_STL r2, PPC_MIN_STKFRM + STK_GOT(r1) + .cfi_rel_offset r2, PPC_MIN_STKFRM + STK_GOT +#endif + get_datapage r5 + .ifeq \call_time + addi r5, r5, VDSO_DATA_OFFSET + .else + addi r4, r5, VDSO_DATA_OFFSET + .endif + bl DOTSYM(\funct) + PPC_LL r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1) +#ifdef __powerpc64__ + PPC_LL r2, PPC_MIN_STKFRM + STK_GOT(r1) + .cfi_restore r2 +#endif + .ifeq \call_time + cmpwi r3, 0 + .endif + mtlr r0 + addi r1, r1, 2 * PPC_MIN_STKFRM + .cfi_restore lr + .cfi_def_cfa_offset 0 + crclr so + .ifeq \call_time + beqlr+ + crset so + neg r3, r3 + .endif + blr + .cfi_endproc +.endm + + .text +/* + * Exact prototype of gettimeofday + * + * int __kernel_gettimeofday(struct timeval *tv, struct timezone *tz); + * + */ +V_FUNCTION_BEGIN(__kernel_gettimeofday) + cvdso_call __c_kernel_gettimeofday +V_FUNCTION_END(__kernel_gettimeofday) + +/* + * Exact prototype of clock_gettime() + * + * int __kernel_clock_gettime(clockid_t clock_id, struct timespec *tp); + * + */ +V_FUNCTION_BEGIN(__kernel_clock_gettime) + cvdso_call __c_kernel_clock_gettime +V_FUNCTION_END(__kernel_clock_gettime) + +/* + * Exact prototype of clock_gettime64() + * + * int __kernel_clock_gettime64(clockid_t clock_id, struct __timespec64 *ts); + * + */ +#ifndef __powerpc64__ +V_FUNCTION_BEGIN(__kernel_clock_gettime64) + cvdso_call __c_kernel_clock_gettime64 +V_FUNCTION_END(__kernel_clock_gettime64) +#endif + +/* + * Exact prototype of clock_getres() + * + * int __kernel_clock_getres(clockid_t clock_id, struct timespec *res); + * + */ +V_FUNCTION_BEGIN(__kernel_clock_getres) + cvdso_call __c_kernel_clock_getres +V_FUNCTION_END(__kernel_clock_getres) + + +/* + * Exact prototype of time() + * + * time_t time(time *t); + * + */ +V_FUNCTION_BEGIN(__kernel_time) + cvdso_call __c_kernel_time call_time=1 +V_FUNCTION_END(__kernel_time) + +/* Routines for restoring integer registers, called by the compiler. */ +/* Called with r11 pointing to the stack header word of the caller of the */ +/* function, just beyond the end of the integer restore area. */ +#ifndef __powerpc64__ +_GLOBAL(_restgpr_31_x) +_GLOBAL(_rest32gpr_31_x) + lwz r0,4(r11) + lwz r31,-4(r11) + mtlr r0 + mr r1,r11 + blr +#endif diff --git a/arch/powerpc/kernel/vdso/note.S b/arch/powerpc/kernel/vdso/note.S new file mode 100644 index 000000000..227a73273 --- /dev/null +++ b/arch/powerpc/kernel/vdso/note.S @@ -0,0 +1,28 @@ +/* + * This supplies .note.* sections to go into the PT_NOTE inside the vDSO text. + * Here we can supply some information useful to userland. + */ + +#include <linux/uts.h> +#include <linux/version.h> +#include <linux/build-salt.h> + +#define ASM_ELF_NOTE_BEGIN(name, flags, vendor, type) \ + .section name, flags; \ + .balign 4; \ + .long 1f - 0f; /* name length */ \ + .long 3f - 2f; /* data length */ \ + .long type; /* note type */ \ +0: .asciz vendor; /* vendor name */ \ +1: .balign 4; \ +2: + +#define ASM_ELF_NOTE_END \ +3: .balign 4; /* pad out section */ \ + .previous + + ASM_ELF_NOTE_BEGIN(".note.kernel-version", "a", UTS_SYSNAME, 0) + .long LINUX_VERSION_CODE + ASM_ELF_NOTE_END + +BUILD_SALT diff --git a/arch/powerpc/kernel/vdso/sigtramp32.S b/arch/powerpc/kernel/vdso/sigtramp32.S new file mode 100644 index 000000000..0bcc5e5fe --- /dev/null +++ b/arch/powerpc/kernel/vdso/sigtramp32.S @@ -0,0 +1,295 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Signal trampolines for 32 bits processes in a ppc64 kernel for + * use in the vDSO + * + * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org), IBM Corp. + * Copyright (C) 2004 Alan Modra (amodra@au.ibm.com)), IBM Corp. + */ +#include <asm/processor.h> +#include <asm/ppc_asm.h> +#include <asm/unistd.h> +#include <asm/vdso.h> + + .text + +/* The nop here is a hack. The dwarf2 unwind routines subtract 1 from + the return address to get an address in the middle of the presumed + call instruction. Since we don't have a call here, we artificially + extend the range covered by the unwind info by adding a nop before + the real start. */ + nop +V_FUNCTION_BEGIN(__kernel_sigtramp32) +.Lsig_start = . - 4 + li r0,__NR_sigreturn + sc +.Lsig_end: +V_FUNCTION_END(__kernel_sigtramp32) + +.Lsigrt_start: + nop +V_FUNCTION_BEGIN(__kernel_sigtramp_rt32) + li r0,__NR_rt_sigreturn + sc +.Lsigrt_end: +V_FUNCTION_END(__kernel_sigtramp_rt32) + + .section .eh_frame,"a",@progbits + +/* Register r1 can be found at offset 4 of a pt_regs structure. + A pointer to the pt_regs is stored in memory at the old sp plus PTREGS. */ +#define cfa_save \ + .byte 0x0f; /* DW_CFA_def_cfa_expression */ \ + .uleb128 9f - 1f; /* length */ \ +1: \ + .byte 0x71; .sleb128 PTREGS; /* DW_OP_breg1 */ \ + .byte 0x06; /* DW_OP_deref */ \ + .byte 0x23; .uleb128 RSIZE; /* DW_OP_plus_uconst */ \ + .byte 0x06; /* DW_OP_deref */ \ +9: + +/* Register REGNO can be found at offset OFS of a pt_regs structure. + A pointer to the pt_regs is stored in memory at the old sp plus PTREGS. */ +#define rsave(regno, ofs) \ + .byte 0x10; /* DW_CFA_expression */ \ + .uleb128 regno; /* regno */ \ + .uleb128 9f - 1f; /* length */ \ +1: \ + .byte 0x71; .sleb128 PTREGS; /* DW_OP_breg1 */ \ + .byte 0x06; /* DW_OP_deref */ \ + .ifne ofs; \ + .byte 0x23; .uleb128 ofs; /* DW_OP_plus_uconst */ \ + .endif; \ +9: + +/* If msr bit 1<<25 is set, then VMX register REGNO is at offset REGNO*16 + of the VMX reg struct. The VMX reg struct is at offset VREGS of + the pt_regs struct. This macro is for REGNO == 0, and contains + 'subroutines' that the other macros jump to. */ +#define vsave_msr0(regno) \ + .byte 0x10; /* DW_CFA_expression */ \ + .uleb128 regno + 77; /* regno */ \ + .uleb128 9f - 1f; /* length */ \ +1: \ + .byte 0x30 + regno; /* DW_OP_lit0 */ \ +2: \ + .byte 0x40; /* DW_OP_lit16 */ \ + .byte 0x1e; /* DW_OP_mul */ \ +3: \ + .byte 0x71; .sleb128 PTREGS; /* DW_OP_breg1 */ \ + .byte 0x06; /* DW_OP_deref */ \ + .byte 0x12; /* DW_OP_dup */ \ + .byte 0x23; /* DW_OP_plus_uconst */ \ + .uleb128 33*RSIZE; /* msr offset */ \ + .byte 0x06; /* DW_OP_deref */ \ + .byte 0x0c; .long 1 << 25; /* DW_OP_const4u */ \ + .byte 0x1a; /* DW_OP_and */ \ + .byte 0x12; /* DW_OP_dup, ret 0 if bra taken */ \ + .byte 0x30; /* DW_OP_lit0 */ \ + .byte 0x29; /* DW_OP_eq */ \ + .byte 0x28; .short 0x7fff; /* DW_OP_bra to end */ \ + .byte 0x13; /* DW_OP_drop, pop the 0 */ \ + .byte 0x23; .uleb128 VREGS; /* DW_OP_plus_uconst */ \ + .byte 0x22; /* DW_OP_plus */ \ + .byte 0x2f; .short 0x7fff; /* DW_OP_skip to end */ \ +9: + +/* If msr bit 1<<25 is set, then VMX register REGNO is at offset REGNO*16 + of the VMX reg struct. REGNO is 1 thru 31. */ +#define vsave_msr1(regno) \ + .byte 0x10; /* DW_CFA_expression */ \ + .uleb128 regno + 77; /* regno */ \ + .uleb128 9f - 1f; /* length */ \ +1: \ + .byte 0x30 + regno; /* DW_OP_lit n */ \ + .byte 0x2f; .short 2b - 9f; /* DW_OP_skip */ \ +9: + +/* If msr bit 1<<25 is set, then VMX register REGNO is at offset OFS of + the VMX save block. */ +#define vsave_msr2(regno, ofs) \ + .byte 0x10; /* DW_CFA_expression */ \ + .uleb128 regno + 77; /* regno */ \ + .uleb128 9f - 1f; /* length */ \ +1: \ + .byte 0x0a; .short ofs; /* DW_OP_const2u */ \ + .byte 0x2f; .short 3b - 9f; /* DW_OP_skip */ \ +9: + +/* VMX register REGNO is at offset OFS of the VMX save area. */ +#define vsave(regno, ofs) \ + .byte 0x10; /* DW_CFA_expression */ \ + .uleb128 regno + 77; /* regno */ \ + .uleb128 9f - 1f; /* length */ \ +1: \ + .byte 0x71; .sleb128 PTREGS; /* DW_OP_breg1 */ \ + .byte 0x06; /* DW_OP_deref */ \ + .byte 0x23; .uleb128 VREGS; /* DW_OP_plus_uconst */ \ + .byte 0x23; .uleb128 ofs; /* DW_OP_plus_uconst */ \ +9: + +/* This is where the pt_regs pointer can be found on the stack. */ +#define PTREGS 64+28 + +/* Size of regs. */ +#define RSIZE 4 + +/* This is the offset of the VMX regs. */ +#define VREGS 48*RSIZE+34*8 + +/* Describe where general purpose regs are saved. */ +#define EH_FRAME_GEN \ + cfa_save; \ + rsave ( 0, 0*RSIZE); \ + rsave ( 2, 2*RSIZE); \ + rsave ( 3, 3*RSIZE); \ + rsave ( 4, 4*RSIZE); \ + rsave ( 5, 5*RSIZE); \ + rsave ( 6, 6*RSIZE); \ + rsave ( 7, 7*RSIZE); \ + rsave ( 8, 8*RSIZE); \ + rsave ( 9, 9*RSIZE); \ + rsave (10, 10*RSIZE); \ + rsave (11, 11*RSIZE); \ + rsave (12, 12*RSIZE); \ + rsave (13, 13*RSIZE); \ + rsave (14, 14*RSIZE); \ + rsave (15, 15*RSIZE); \ + rsave (16, 16*RSIZE); \ + rsave (17, 17*RSIZE); \ + rsave (18, 18*RSIZE); \ + rsave (19, 19*RSIZE); \ + rsave (20, 20*RSIZE); \ + rsave (21, 21*RSIZE); \ + rsave (22, 22*RSIZE); \ + rsave (23, 23*RSIZE); \ + rsave (24, 24*RSIZE); \ + rsave (25, 25*RSIZE); \ + rsave (26, 26*RSIZE); \ + rsave (27, 27*RSIZE); \ + rsave (28, 28*RSIZE); \ + rsave (29, 29*RSIZE); \ + rsave (30, 30*RSIZE); \ + rsave (31, 31*RSIZE); \ + rsave (67, 32*RSIZE); /* ap, used as temp for nip */ \ + rsave (65, 36*RSIZE); /* lr */ \ + rsave (70, 38*RSIZE) /* cr */ + +/* Describe where the FP regs are saved. */ +#define EH_FRAME_FP \ + rsave (32, 48*RSIZE + 0*8); \ + rsave (33, 48*RSIZE + 1*8); \ + rsave (34, 48*RSIZE + 2*8); \ + rsave (35, 48*RSIZE + 3*8); \ + rsave (36, 48*RSIZE + 4*8); \ + rsave (37, 48*RSIZE + 5*8); \ + rsave (38, 48*RSIZE + 6*8); \ + rsave (39, 48*RSIZE + 7*8); \ + rsave (40, 48*RSIZE + 8*8); \ + rsave (41, 48*RSIZE + 9*8); \ + rsave (42, 48*RSIZE + 10*8); \ + rsave (43, 48*RSIZE + 11*8); \ + rsave (44, 48*RSIZE + 12*8); \ + rsave (45, 48*RSIZE + 13*8); \ + rsave (46, 48*RSIZE + 14*8); \ + rsave (47, 48*RSIZE + 15*8); \ + rsave (48, 48*RSIZE + 16*8); \ + rsave (49, 48*RSIZE + 17*8); \ + rsave (50, 48*RSIZE + 18*8); \ + rsave (51, 48*RSIZE + 19*8); \ + rsave (52, 48*RSIZE + 20*8); \ + rsave (53, 48*RSIZE + 21*8); \ + rsave (54, 48*RSIZE + 22*8); \ + rsave (55, 48*RSIZE + 23*8); \ + rsave (56, 48*RSIZE + 24*8); \ + rsave (57, 48*RSIZE + 25*8); \ + rsave (58, 48*RSIZE + 26*8); \ + rsave (59, 48*RSIZE + 27*8); \ + rsave (60, 48*RSIZE + 28*8); \ + rsave (61, 48*RSIZE + 29*8); \ + rsave (62, 48*RSIZE + 30*8); \ + rsave (63, 48*RSIZE + 31*8) + +/* Describe where the VMX regs are saved. */ +#ifdef CONFIG_ALTIVEC +#define EH_FRAME_VMX \ + vsave_msr0 ( 0); \ + vsave_msr1 ( 1); \ + vsave_msr1 ( 2); \ + vsave_msr1 ( 3); \ + vsave_msr1 ( 4); \ + vsave_msr1 ( 5); \ + vsave_msr1 ( 6); \ + vsave_msr1 ( 7); \ + vsave_msr1 ( 8); \ + vsave_msr1 ( 9); \ + vsave_msr1 (10); \ + vsave_msr1 (11); \ + vsave_msr1 (12); \ + vsave_msr1 (13); \ + vsave_msr1 (14); \ + vsave_msr1 (15); \ + vsave_msr1 (16); \ + vsave_msr1 (17); \ + vsave_msr1 (18); \ + vsave_msr1 (19); \ + vsave_msr1 (20); \ + vsave_msr1 (21); \ + vsave_msr1 (22); \ + vsave_msr1 (23); \ + vsave_msr1 (24); \ + vsave_msr1 (25); \ + vsave_msr1 (26); \ + vsave_msr1 (27); \ + vsave_msr1 (28); \ + vsave_msr1 (29); \ + vsave_msr1 (30); \ + vsave_msr1 (31); \ + vsave_msr2 (33, 32*16+12); \ + vsave (32, 32*16) +#else +#define EH_FRAME_VMX +#endif + +.Lcie: + .long .Lcie_end - .Lcie_start +.Lcie_start: + .long 0 /* CIE ID */ + .byte 1 /* Version number */ + .string "zRS" /* NUL-terminated augmentation string */ + .uleb128 4 /* Code alignment factor */ + .sleb128 -4 /* Data alignment factor */ + .byte 67 /* Return address register column, ap */ + .uleb128 1 /* Augmentation value length */ + .byte 0x1b /* DW_EH_PE_pcrel | DW_EH_PE_sdata4. */ + .byte 0x0c,1,0 /* DW_CFA_def_cfa: r1 ofs 0 */ + .balign 4 +.Lcie_end: + + .long .Lfde0_end - .Lfde0_start +.Lfde0_start: + .long .Lfde0_start - .Lcie /* CIE pointer. */ + .long .Lsig_start - . /* PC start, length */ + .long .Lsig_end - .Lsig_start + .uleb128 0 /* Augmentation */ + EH_FRAME_GEN + EH_FRAME_FP + EH_FRAME_VMX + .balign 4 +.Lfde0_end: + +/* We have a different stack layout for rt_sigreturn. */ +#undef PTREGS +#define PTREGS 64+16+128+20+28 + + .long .Lfde1_end - .Lfde1_start +.Lfde1_start: + .long .Lfde1_start - .Lcie /* CIE pointer. */ + .long .Lsigrt_start - . /* PC start, length */ + .long .Lsigrt_end - .Lsigrt_start + .uleb128 0 /* Augmentation */ + EH_FRAME_GEN + EH_FRAME_FP + EH_FRAME_VMX + .balign 4 +.Lfde1_end: diff --git a/arch/powerpc/kernel/vdso/sigtramp64.S b/arch/powerpc/kernel/vdso/sigtramp64.S new file mode 100644 index 000000000..2d4067561 --- /dev/null +++ b/arch/powerpc/kernel/vdso/sigtramp64.S @@ -0,0 +1,313 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Signal trampoline for 64 bits processes in a ppc64 kernel for + * use in the vDSO + * + * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org), IBM Corp. + * Copyright (C) 2004 Alan Modra (amodra@au.ibm.com)), IBM Corp. + */ +#include <asm/cache.h> /* IFETCH_ALIGN_BYTES */ +#include <asm/processor.h> +#include <asm/ppc_asm.h> +#include <asm/unistd.h> +#include <asm/vdso.h> +#include <asm/ptrace.h> /* XXX for __SIGNAL_FRAMESIZE */ + + .text + +/* + * __kernel_start_sigtramp_rt64 and __kernel_sigtramp_rt64 together + * are one function split in two parts. The kernel jumps to the former + * and the signal handler indirectly (by blr) returns to the latter. + * __kernel_sigtramp_rt64 needs to point to the return address so + * glibc can correctly identify the trampoline stack frame. + */ + .balign 8 + .balign IFETCH_ALIGN_BYTES +V_FUNCTION_BEGIN(__kernel_start_sigtramp_rt64) +.Lsigrt_start: + bctrl /* call the handler */ +V_FUNCTION_END(__kernel_start_sigtramp_rt64) +V_FUNCTION_BEGIN(__kernel_sigtramp_rt64) + addi r1, r1, __SIGNAL_FRAMESIZE + li r0,__NR_rt_sigreturn + sc +.Lsigrt_end: +V_FUNCTION_END(__kernel_sigtramp_rt64) +/* The .balign 8 above and the following zeros mimic the old stack + trampoline layout. The last magic value is the ucontext pointer, + chosen in such a way that older libgcc unwind code returns a zero + for a sigcontext pointer. */ + .long 0,0,0 + .quad 0,-21*8 + +/* Register r1 can be found at offset 8 of a pt_regs structure. + A pointer to the pt_regs is stored in memory at the old sp plus PTREGS. */ +#define cfa_save \ + .byte 0x0f; /* DW_CFA_def_cfa_expression */ \ + .uleb128 9f - 1f; /* length */ \ +1: \ + .byte 0x71; .sleb128 PTREGS; /* DW_OP_breg1 */ \ + .byte 0x06; /* DW_OP_deref */ \ + .byte 0x23; .uleb128 RSIZE; /* DW_OP_plus_uconst */ \ + .byte 0x06; /* DW_OP_deref */ \ +9: + +/* Register REGNO can be found at offset OFS of a pt_regs structure. + A pointer to the pt_regs is stored in memory at the old sp plus PTREGS. */ +#define rsave(regno, ofs) \ + .byte 0x10; /* DW_CFA_expression */ \ + .uleb128 regno; /* regno */ \ + .uleb128 9f - 1f; /* length */ \ +1: \ + .byte 0x71; .sleb128 PTREGS; /* DW_OP_breg1 */ \ + .byte 0x06; /* DW_OP_deref */ \ + .ifne ofs; \ + .byte 0x23; .uleb128 ofs; /* DW_OP_plus_uconst */ \ + .endif; \ +9: + +/* If msr bit 1<<25 is set, then VMX register REGNO is at offset REGNO*16 + of the VMX reg struct. A pointer to the VMX reg struct is at VREGS in + the pt_regs struct. This macro is for REGNO == 0, and contains + 'subroutines' that the other macros jump to. */ +#define vsave_msr0(regno) \ + .byte 0x10; /* DW_CFA_expression */ \ + .uleb128 regno + 77; /* regno */ \ + .uleb128 9f - 1f; /* length */ \ +1: \ + .byte 0x30 + regno; /* DW_OP_lit0 */ \ +2: \ + .byte 0x40; /* DW_OP_lit16 */ \ + .byte 0x1e; /* DW_OP_mul */ \ +3: \ + .byte 0x71; .sleb128 PTREGS; /* DW_OP_breg1 */ \ + .byte 0x06; /* DW_OP_deref */ \ + .byte 0x12; /* DW_OP_dup */ \ + .byte 0x23; /* DW_OP_plus_uconst */ \ + .uleb128 33*RSIZE; /* msr offset */ \ + .byte 0x06; /* DW_OP_deref */ \ + .byte 0x0c; .long 1 << 25; /* DW_OP_const4u */ \ + .byte 0x1a; /* DW_OP_and */ \ + .byte 0x12; /* DW_OP_dup, ret 0 if bra taken */ \ + .byte 0x30; /* DW_OP_lit0 */ \ + .byte 0x29; /* DW_OP_eq */ \ + .byte 0x28; .short 0x7fff; /* DW_OP_bra to end */ \ + .byte 0x13; /* DW_OP_drop, pop the 0 */ \ + .byte 0x23; .uleb128 VREGS; /* DW_OP_plus_uconst */ \ + .byte 0x06; /* DW_OP_deref */ \ + .byte 0x22; /* DW_OP_plus */ \ + .byte 0x2f; .short 0x7fff; /* DW_OP_skip to end */ \ +9: + +/* If msr bit 1<<25 is set, then VMX register REGNO is at offset REGNO*16 + of the VMX reg struct. REGNO is 1 thru 31. */ +#define vsave_msr1(regno) \ + .byte 0x10; /* DW_CFA_expression */ \ + .uleb128 regno + 77; /* regno */ \ + .uleb128 9f - 1f; /* length */ \ +1: \ + .byte 0x30 + regno; /* DW_OP_lit n */ \ + .byte 0x2f; .short 2b - 9f; /* DW_OP_skip */ \ +9: + +/* If msr bit 1<<25 is set, then VMX register REGNO is at offset OFS of + the VMX save block. */ +#define vsave_msr2(regno, ofs) \ + .byte 0x10; /* DW_CFA_expression */ \ + .uleb128 regno + 77; /* regno */ \ + .uleb128 9f - 1f; /* length */ \ +1: \ + .byte 0x0a; .short ofs; /* DW_OP_const2u */ \ + .byte 0x2f; .short 3b - 9f; /* DW_OP_skip */ \ +9: + +/* VMX register REGNO is at offset OFS of the VMX save area. */ +#define vsave(regno, ofs) \ + .byte 0x10; /* DW_CFA_expression */ \ + .uleb128 regno + 77; /* regno */ \ + .uleb128 9f - 1f; /* length */ \ +1: \ + .byte 0x71; .sleb128 PTREGS; /* DW_OP_breg1 */ \ + .byte 0x06; /* DW_OP_deref */ \ + .byte 0x23; .uleb128 VREGS; /* DW_OP_plus_uconst */ \ + .byte 0x06; /* DW_OP_deref */ \ + .byte 0x23; .uleb128 ofs; /* DW_OP_plus_uconst */ \ +9: + +/* This is where the pt_regs pointer can be found on the stack. */ +#define PTREGS 128+168+56 + +/* Size of regs. */ +#define RSIZE 8 + +/* Size of CR reg in DWARF unwind info. */ +#define CRSIZE 4 + +/* Offset of CR reg within a full word. */ +#ifdef __LITTLE_ENDIAN__ +#define CROFF 0 +#else +#define CROFF (RSIZE - CRSIZE) +#endif + +/* This is the offset of the VMX reg pointer. */ +#define VREGS 48*RSIZE+33*8 + +/* Describe where general purpose regs are saved. */ +#define EH_FRAME_GEN \ + cfa_save; \ + rsave ( 0, 0*RSIZE); \ + rsave ( 2, 2*RSIZE); \ + rsave ( 3, 3*RSIZE); \ + rsave ( 4, 4*RSIZE); \ + rsave ( 5, 5*RSIZE); \ + rsave ( 6, 6*RSIZE); \ + rsave ( 7, 7*RSIZE); \ + rsave ( 8, 8*RSIZE); \ + rsave ( 9, 9*RSIZE); \ + rsave (10, 10*RSIZE); \ + rsave (11, 11*RSIZE); \ + rsave (12, 12*RSIZE); \ + rsave (13, 13*RSIZE); \ + rsave (14, 14*RSIZE); \ + rsave (15, 15*RSIZE); \ + rsave (16, 16*RSIZE); \ + rsave (17, 17*RSIZE); \ + rsave (18, 18*RSIZE); \ + rsave (19, 19*RSIZE); \ + rsave (20, 20*RSIZE); \ + rsave (21, 21*RSIZE); \ + rsave (22, 22*RSIZE); \ + rsave (23, 23*RSIZE); \ + rsave (24, 24*RSIZE); \ + rsave (25, 25*RSIZE); \ + rsave (26, 26*RSIZE); \ + rsave (27, 27*RSIZE); \ + rsave (28, 28*RSIZE); \ + rsave (29, 29*RSIZE); \ + rsave (30, 30*RSIZE); \ + rsave (31, 31*RSIZE); \ + rsave (67, 32*RSIZE); /* ap, used as temp for nip */ \ + rsave (65, 36*RSIZE); /* lr */ \ + rsave (68, 38*RSIZE + CROFF); /* cr fields */ \ + rsave (69, 38*RSIZE + CROFF); \ + rsave (70, 38*RSIZE + CROFF); \ + rsave (71, 38*RSIZE + CROFF); \ + rsave (72, 38*RSIZE + CROFF); \ + rsave (73, 38*RSIZE + CROFF); \ + rsave (74, 38*RSIZE + CROFF); \ + rsave (75, 38*RSIZE + CROFF) + +/* Describe where the FP regs are saved. */ +#define EH_FRAME_FP \ + rsave (32, 48*RSIZE + 0*8); \ + rsave (33, 48*RSIZE + 1*8); \ + rsave (34, 48*RSIZE + 2*8); \ + rsave (35, 48*RSIZE + 3*8); \ + rsave (36, 48*RSIZE + 4*8); \ + rsave (37, 48*RSIZE + 5*8); \ + rsave (38, 48*RSIZE + 6*8); \ + rsave (39, 48*RSIZE + 7*8); \ + rsave (40, 48*RSIZE + 8*8); \ + rsave (41, 48*RSIZE + 9*8); \ + rsave (42, 48*RSIZE + 10*8); \ + rsave (43, 48*RSIZE + 11*8); \ + rsave (44, 48*RSIZE + 12*8); \ + rsave (45, 48*RSIZE + 13*8); \ + rsave (46, 48*RSIZE + 14*8); \ + rsave (47, 48*RSIZE + 15*8); \ + rsave (48, 48*RSIZE + 16*8); \ + rsave (49, 48*RSIZE + 17*8); \ + rsave (50, 48*RSIZE + 18*8); \ + rsave (51, 48*RSIZE + 19*8); \ + rsave (52, 48*RSIZE + 20*8); \ + rsave (53, 48*RSIZE + 21*8); \ + rsave (54, 48*RSIZE + 22*8); \ + rsave (55, 48*RSIZE + 23*8); \ + rsave (56, 48*RSIZE + 24*8); \ + rsave (57, 48*RSIZE + 25*8); \ + rsave (58, 48*RSIZE + 26*8); \ + rsave (59, 48*RSIZE + 27*8); \ + rsave (60, 48*RSIZE + 28*8); \ + rsave (61, 48*RSIZE + 29*8); \ + rsave (62, 48*RSIZE + 30*8); \ + rsave (63, 48*RSIZE + 31*8) + +/* Describe where the VMX regs are saved. */ +#ifdef CONFIG_ALTIVEC +#define EH_FRAME_VMX \ + vsave_msr0 ( 0); \ + vsave_msr1 ( 1); \ + vsave_msr1 ( 2); \ + vsave_msr1 ( 3); \ + vsave_msr1 ( 4); \ + vsave_msr1 ( 5); \ + vsave_msr1 ( 6); \ + vsave_msr1 ( 7); \ + vsave_msr1 ( 8); \ + vsave_msr1 ( 9); \ + vsave_msr1 (10); \ + vsave_msr1 (11); \ + vsave_msr1 (12); \ + vsave_msr1 (13); \ + vsave_msr1 (14); \ + vsave_msr1 (15); \ + vsave_msr1 (16); \ + vsave_msr1 (17); \ + vsave_msr1 (18); \ + vsave_msr1 (19); \ + vsave_msr1 (20); \ + vsave_msr1 (21); \ + vsave_msr1 (22); \ + vsave_msr1 (23); \ + vsave_msr1 (24); \ + vsave_msr1 (25); \ + vsave_msr1 (26); \ + vsave_msr1 (27); \ + vsave_msr1 (28); \ + vsave_msr1 (29); \ + vsave_msr1 (30); \ + vsave_msr1 (31); \ + vsave_msr2 (33, 32*16+12); \ + vsave (32, 33*16) +#else +#define EH_FRAME_VMX +#endif + + .section .eh_frame,"a",@progbits +.Lcie: + .long .Lcie_end - .Lcie_start +.Lcie_start: + .long 0 /* CIE ID */ + .byte 1 /* Version number */ + .string "zRS" /* NUL-terminated augmentation string */ + .uleb128 4 /* Code alignment factor */ + .sleb128 -8 /* Data alignment factor */ + .byte 67 /* Return address register column, ap */ + .uleb128 1 /* Augmentation value length */ + .byte 0x14 /* DW_EH_PE_pcrel | DW_EH_PE_udata8. */ + .byte 0x0c,1,0 /* DW_CFA_def_cfa: r1 ofs 0 */ + .balign 8 +.Lcie_end: + + .long .Lfde0_end - .Lfde0_start +.Lfde0_start: + .long .Lfde0_start - .Lcie /* CIE pointer. */ + .quad .Lsigrt_start - . /* PC start, length */ + .quad .Lsigrt_end - .Lsigrt_start + .uleb128 0 /* Augmentation */ + EH_FRAME_GEN + EH_FRAME_FP + EH_FRAME_VMX +# Do we really need to describe the frame at this point? ie. will +# we ever have some call chain that returns somewhere past the addi? +# I don't think so, since gcc doesn't support async signals. +# .byte 0x41 /* DW_CFA_advance_loc 1*4 */ +#undef PTREGS +#define PTREGS 168+56 +# EH_FRAME_GEN +# EH_FRAME_FP +# EH_FRAME_VMX + .balign 8 +.Lfde0_end: diff --git a/arch/powerpc/kernel/vdso/vdso32.lds.S b/arch/powerpc/kernel/vdso/vdso32.lds.S new file mode 100644 index 000000000..bc0be274a --- /dev/null +++ b/arch/powerpc/kernel/vdso/vdso32.lds.S @@ -0,0 +1,138 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * This is the infamous ld script for the 32 bits vdso + * library + */ +#include <asm/vdso.h> +#include <asm/page.h> +#include <asm-generic/vmlinux.lds.h> + +#ifdef __LITTLE_ENDIAN__ +OUTPUT_FORMAT("elf32-powerpcle", "elf32-powerpcle", "elf32-powerpcle") +#else +OUTPUT_FORMAT("elf32-powerpc", "elf32-powerpc", "elf32-powerpc") +#endif +OUTPUT_ARCH(powerpc:common) + +SECTIONS +{ + PROVIDE(_vdso_datapage = . - 2 * PAGE_SIZE); + . = SIZEOF_HEADERS; + + .hash : { *(.hash) } :text + .gnu.hash : { *(.gnu.hash) } + .dynsym : { *(.dynsym) } + .dynstr : { *(.dynstr) } + .gnu.version : { *(.gnu.version) } + .gnu.version_d : { *(.gnu.version_d) } + .gnu.version_r : { *(.gnu.version_r) } + + .note : { *(.note.*) } :text :note + + . = ALIGN(16); + .text : { + *(.text .stub .text.* .gnu.linkonce.t.* __ftr_alt_*) + } :text + PROVIDE(__etext = .); + PROVIDE(_etext = .); + PROVIDE(etext = .); + + . = ALIGN(8); + VDSO_ftr_fixup_start = .; + __ftr_fixup : { *(__ftr_fixup) } + VDSO_ftr_fixup_end = .; + + . = ALIGN(8); + VDSO_mmu_ftr_fixup_start = .; + __mmu_ftr_fixup : { *(__mmu_ftr_fixup) } + VDSO_mmu_ftr_fixup_end = .; + + . = ALIGN(8); + VDSO_lwsync_fixup_start = .; + __lwsync_fixup : { *(__lwsync_fixup) } + VDSO_lwsync_fixup_end = .; + +#ifdef CONFIG_PPC64 + . = ALIGN(8); + VDSO_fw_ftr_fixup_start = .; + __fw_ftr_fixup : { *(__fw_ftr_fixup) } + VDSO_fw_ftr_fixup_end = .; +#endif + + /* + * Other stuff is appended to the text segment: + */ + .rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) } + .rodata1 : { *(.rodata1) } + + .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr + .eh_frame : { KEEP (*(.eh_frame)) } :text + .gcc_except_table : { *(.gcc_except_table) } + .fixup : { *(.fixup) } + + .dynamic : { *(.dynamic) } :text :dynamic + .got : { *(.got) } :text + .plt : { *(.plt) } + + _end = .; + __end = .; + PROVIDE(end = .); + + DWARF_DEBUG + ELF_DETAILS + + /DISCARD/ : { + *(.note.GNU-stack) + *(.data .data.* .gnu.linkonce.d.* .sdata*) + *(.bss .sbss .dynbss .dynsbss) + *(.got1) + } +} + +/* + * Very old versions of ld do not recognize this name token; use the constant. + */ +#define PT_GNU_EH_FRAME 0x6474e550 + +/* + * We must supply the ELF program headers explicitly to get just one + * PT_LOAD segment, and set the flags explicitly to make segments read-only. + */ +PHDRS +{ + text PT_LOAD FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */ + dynamic PT_DYNAMIC FLAGS(4); /* PF_R */ + note PT_NOTE FLAGS(4); /* PF_R */ + eh_frame_hdr PT_GNU_EH_FRAME; +} + +/* + * This controls what symbols we export from the DSO. + */ +VERSION +{ + VDSO_VERSION_STRING { + global: + __kernel_get_syscall_map; + __kernel_gettimeofday; + __kernel_clock_gettime; + __kernel_clock_gettime64; + __kernel_clock_getres; + __kernel_time; + __kernel_get_tbfreq; + __kernel_sync_dicache; + __kernel_sigtramp32; + __kernel_sigtramp_rt32; +#if defined(CONFIG_PPC64) || !defined(CONFIG_SMP) + __kernel_getcpu; +#endif + + local: *; + }; +} + +/* + * Make the sigreturn code visible to the kernel. + */ +VDSO_sigtramp32 = __kernel_sigtramp32; +VDSO_sigtramp_rt32 = __kernel_sigtramp_rt32; diff --git a/arch/powerpc/kernel/vdso/vdso64.lds.S b/arch/powerpc/kernel/vdso/vdso64.lds.S new file mode 100644 index 000000000..744ae5363 --- /dev/null +++ b/arch/powerpc/kernel/vdso/vdso64.lds.S @@ -0,0 +1,132 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * This is the infamous ld script for the 64 bits vdso + * library + */ +#include <asm/vdso.h> +#include <asm/page.h> +#include <asm-generic/vmlinux.lds.h> + +#ifdef __LITTLE_ENDIAN__ +OUTPUT_FORMAT("elf64-powerpcle", "elf64-powerpcle", "elf64-powerpcle") +#else +OUTPUT_FORMAT("elf64-powerpc", "elf64-powerpc", "elf64-powerpc") +#endif +OUTPUT_ARCH(powerpc:common64) + +SECTIONS +{ + PROVIDE(_vdso_datapage = . - 2 * PAGE_SIZE); + . = SIZEOF_HEADERS; + + .hash : { *(.hash) } :text + .gnu.hash : { *(.gnu.hash) } + .dynsym : { *(.dynsym) } + .dynstr : { *(.dynstr) } + .gnu.version : { *(.gnu.version) } + .gnu.version_d : { *(.gnu.version_d) } + .gnu.version_r : { *(.gnu.version_r) } + + .note : { *(.note.*) } :text :note + + . = ALIGN(16); + .text : { + *(.text .stub .text.* .gnu.linkonce.t.* __ftr_alt_*) + *(.sfpr .glink) + } :text + PROVIDE(__etext = .); + PROVIDE(_etext = .); + PROVIDE(etext = .); + + . = ALIGN(8); + VDSO_ftr_fixup_start = .; + __ftr_fixup : { *(__ftr_fixup) } + VDSO_ftr_fixup_end = .; + + . = ALIGN(8); + VDSO_mmu_ftr_fixup_start = .; + __mmu_ftr_fixup : { *(__mmu_ftr_fixup) } + VDSO_mmu_ftr_fixup_end = .; + + . = ALIGN(8); + VDSO_lwsync_fixup_start = .; + __lwsync_fixup : { *(__lwsync_fixup) } + VDSO_lwsync_fixup_end = .; + + . = ALIGN(8); + VDSO_fw_ftr_fixup_start = .; + __fw_ftr_fixup : { *(__fw_ftr_fixup) } + VDSO_fw_ftr_fixup_end = .; + + /* + * Other stuff is appended to the text segment: + */ + .rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) } + .rodata1 : { *(.rodata1) } + + .dynamic : { *(.dynamic) } :text :dynamic + + .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr + .eh_frame : { KEEP (*(.eh_frame)) } :text + .gcc_except_table : { *(.gcc_except_table) } + .rela.dyn ALIGN(8) : { *(.rela.dyn) } + + .got ALIGN(8) : { *(.got .toc) } + + _end = .; + PROVIDE(end = .); + + DWARF_DEBUG + ELF_DETAILS + + /DISCARD/ : { + *(.note.GNU-stack) + *(.branch_lt) + *(.data .data.* .gnu.linkonce.d.* .sdata*) + *(.bss .sbss .dynbss .dynsbss) + *(.opd) + } +} + +/* + * Very old versions of ld do not recognize this name token; use the constant. + */ +#define PT_GNU_EH_FRAME 0x6474e550 + +/* + * We must supply the ELF program headers explicitly to get just one + * PT_LOAD segment, and set the flags explicitly to make segments read-only. + */ +PHDRS +{ + text PT_LOAD FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */ + dynamic PT_DYNAMIC FLAGS(4); /* PF_R */ + note PT_NOTE FLAGS(4); /* PF_R */ + eh_frame_hdr PT_GNU_EH_FRAME; +} + +/* + * This controls what symbols we export from the DSO. + */ +VERSION +{ + VDSO_VERSION_STRING { + global: + __kernel_get_syscall_map; + __kernel_gettimeofday; + __kernel_clock_gettime; + __kernel_clock_getres; + __kernel_get_tbfreq; + __kernel_sync_dicache; + __kernel_sigtramp_rt64; + __kernel_getcpu; + __kernel_time; + + local: *; + }; +} + +/* + * Make the sigreturn code visible to the kernel. + */ +VDSO_sigtramp_rt64 = __kernel_start_sigtramp_rt64; diff --git a/arch/powerpc/kernel/vdso/vgettimeofday.c b/arch/powerpc/kernel/vdso/vgettimeofday.c new file mode 100644 index 000000000..55a287c9a --- /dev/null +++ b/arch/powerpc/kernel/vdso/vgettimeofday.c @@ -0,0 +1,49 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Powerpc userspace implementations of gettimeofday() and similar. + */ +#include <linux/time.h> +#include <linux/types.h> + +#ifdef __powerpc64__ +int __c_kernel_clock_gettime(clockid_t clock, struct __kernel_timespec *ts, + const struct vdso_data *vd) +{ + return __cvdso_clock_gettime_data(vd, clock, ts); +} + +int __c_kernel_clock_getres(clockid_t clock_id, struct __kernel_timespec *res, + const struct vdso_data *vd) +{ + return __cvdso_clock_getres_data(vd, clock_id, res); +} +#else +int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, + const struct vdso_data *vd) +{ + return __cvdso_clock_gettime32_data(vd, clock, ts); +} + +int __c_kernel_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts, + const struct vdso_data *vd) +{ + return __cvdso_clock_gettime_data(vd, clock, ts); +} + +int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, + const struct vdso_data *vd) +{ + return __cvdso_clock_getres_time32_data(vd, clock_id, res); +} +#endif + +int __c_kernel_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz, + const struct vdso_data *vd) +{ + return __cvdso_gettimeofday_data(vd, tv, tz); +} + +__kernel_old_time_t __c_kernel_time(__kernel_old_time_t *time, const struct vdso_data *vd) +{ + return __cvdso_time_data(vd, time); +} diff --git a/arch/powerpc/kernel/vdso32_wrapper.S b/arch/powerpc/kernel/vdso32_wrapper.S new file mode 100644 index 000000000..10f92f265 --- /dev/null +++ b/arch/powerpc/kernel/vdso32_wrapper.S @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include <linux/linkage.h> +#include <asm/page.h> + + __PAGE_ALIGNED_DATA + + .globl vdso32_start, vdso32_end + .balign PAGE_SIZE +vdso32_start: + .incbin "arch/powerpc/kernel/vdso/vdso32.so.dbg" + .balign PAGE_SIZE +vdso32_end: + + .previous diff --git a/arch/powerpc/kernel/vdso64_wrapper.S b/arch/powerpc/kernel/vdso64_wrapper.S new file mode 100644 index 000000000..839d1a614 --- /dev/null +++ b/arch/powerpc/kernel/vdso64_wrapper.S @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include <linux/linkage.h> +#include <asm/page.h> + + __PAGE_ALIGNED_DATA + + .globl vdso64_start, vdso64_end + .balign PAGE_SIZE +vdso64_start: + .incbin "arch/powerpc/kernel/vdso/vdso64.so.dbg" + .balign PAGE_SIZE +vdso64_end: + + .previous diff --git a/arch/powerpc/kernel/vecemu.c b/arch/powerpc/kernel/vecemu.c new file mode 100644 index 000000000..fd9432875 --- /dev/null +++ b/arch/powerpc/kernel/vecemu.c @@ -0,0 +1,351 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Routines to emulate some Altivec/VMX instructions, specifically + * those that can trap when given denormalized operands in Java mode. + */ +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/sched.h> +#include <asm/ptrace.h> +#include <asm/processor.h> +#include <asm/switch_to.h> +#include <linux/uaccess.h> +#include <asm/inst.h> + +/* Functions in vector.S */ +extern void vaddfp(vector128 *dst, vector128 *a, vector128 *b); +extern void vsubfp(vector128 *dst, vector128 *a, vector128 *b); +extern void vmaddfp(vector128 *dst, vector128 *a, vector128 *b, vector128 *c); +extern void vnmsubfp(vector128 *dst, vector128 *a, vector128 *b, vector128 *c); +extern void vrefp(vector128 *dst, vector128 *src); +extern void vrsqrtefp(vector128 *dst, vector128 *src); +extern void vexptep(vector128 *dst, vector128 *src); + +static unsigned int exp2s[8] = { + 0x800000, + 0x8b95c2, + 0x9837f0, + 0xa5fed7, + 0xb504f3, + 0xc5672a, + 0xd744fd, + 0xeac0c7 +}; + +/* + * Computes an estimate of 2^x. The `s' argument is the 32-bit + * single-precision floating-point representation of x. + */ +static unsigned int eexp2(unsigned int s) +{ + int exp, pwr; + unsigned int mant, frac; + + /* extract exponent field from input */ + exp = ((s >> 23) & 0xff) - 127; + if (exp > 7) { + /* check for NaN input */ + if (exp == 128 && (s & 0x7fffff) != 0) + return s | 0x400000; /* return QNaN */ + /* 2^-big = 0, 2^+big = +Inf */ + return (s & 0x80000000)? 0: 0x7f800000; /* 0 or +Inf */ + } + if (exp < -23) + return 0x3f800000; /* 1.0 */ + + /* convert to fixed point integer in 9.23 representation */ + pwr = (s & 0x7fffff) | 0x800000; + if (exp > 0) + pwr <<= exp; + else + pwr >>= -exp; + if (s & 0x80000000) + pwr = -pwr; + + /* extract integer part, which becomes exponent part of result */ + exp = (pwr >> 23) + 126; + if (exp >= 254) + return 0x7f800000; + if (exp < -23) + return 0; + + /* table lookup on top 3 bits of fraction to get mantissa */ + mant = exp2s[(pwr >> 20) & 7]; + + /* linear interpolation using remaining 20 bits of fraction */ + asm("mulhwu %0,%1,%2" : "=r" (frac) + : "r" (pwr << 12), "r" (0x172b83ff)); + asm("mulhwu %0,%1,%2" : "=r" (frac) : "r" (frac), "r" (mant)); + mant += frac; + + if (exp >= 0) + return mant + (exp << 23); + + /* denormalized result */ + exp = -exp; + mant += 1 << (exp - 1); + return mant >> exp; +} + +/* + * Computes an estimate of log_2(x). The `s' argument is the 32-bit + * single-precision floating-point representation of x. + */ +static unsigned int elog2(unsigned int s) +{ + int exp, mant, lz, frac; + + exp = s & 0x7f800000; + mant = s & 0x7fffff; + if (exp == 0x7f800000) { /* Inf or NaN */ + if (mant != 0) + s |= 0x400000; /* turn NaN into QNaN */ + return s; + } + if ((exp | mant) == 0) /* +0 or -0 */ + return 0xff800000; /* return -Inf */ + + if (exp == 0) { + /* denormalized */ + asm("cntlzw %0,%1" : "=r" (lz) : "r" (mant)); + mant <<= lz - 8; + exp = (-118 - lz) << 23; + } else { + mant |= 0x800000; + exp -= 127 << 23; + } + + if (mant >= 0xb504f3) { /* 2^0.5 * 2^23 */ + exp |= 0x400000; /* 0.5 * 2^23 */ + asm("mulhwu %0,%1,%2" : "=r" (mant) + : "r" (mant), "r" (0xb504f334)); /* 2^-0.5 * 2^32 */ + } + if (mant >= 0x9837f0) { /* 2^0.25 * 2^23 */ + exp |= 0x200000; /* 0.25 * 2^23 */ + asm("mulhwu %0,%1,%2" : "=r" (mant) + : "r" (mant), "r" (0xd744fccb)); /* 2^-0.25 * 2^32 */ + } + if (mant >= 0x8b95c2) { /* 2^0.125 * 2^23 */ + exp |= 0x100000; /* 0.125 * 2^23 */ + asm("mulhwu %0,%1,%2" : "=r" (mant) + : "r" (mant), "r" (0xeac0c6e8)); /* 2^-0.125 * 2^32 */ + } + if (mant > 0x800000) { /* 1.0 * 2^23 */ + /* calculate (mant - 1) * 1.381097463 */ + /* 1.381097463 == 0.125 / (2^0.125 - 1) */ + asm("mulhwu %0,%1,%2" : "=r" (frac) + : "r" ((mant - 0x800000) << 1), "r" (0xb0c7cd3a)); + exp += frac; + } + s = exp & 0x80000000; + if (exp != 0) { + if (s) + exp = -exp; + asm("cntlzw %0,%1" : "=r" (lz) : "r" (exp)); + lz = 8 - lz; + if (lz > 0) + exp >>= lz; + else if (lz < 0) + exp <<= -lz; + s += ((lz + 126) << 23) + exp; + } + return s; +} + +#define VSCR_SAT 1 + +static int ctsxs(unsigned int x, int scale, unsigned int *vscrp) +{ + int exp, mant; + + exp = (x >> 23) & 0xff; + mant = x & 0x7fffff; + if (exp == 255 && mant != 0) + return 0; /* NaN -> 0 */ + exp = exp - 127 + scale; + if (exp < 0) + return 0; /* round towards zero */ + if (exp >= 31) { + /* saturate, unless the result would be -2^31 */ + if (x + (scale << 23) != 0xcf000000) + *vscrp |= VSCR_SAT; + return (x & 0x80000000)? 0x80000000: 0x7fffffff; + } + mant |= 0x800000; + mant = (mant << 7) >> (30 - exp); + return (x & 0x80000000)? -mant: mant; +} + +static unsigned int ctuxs(unsigned int x, int scale, unsigned int *vscrp) +{ + int exp; + unsigned int mant; + + exp = (x >> 23) & 0xff; + mant = x & 0x7fffff; + if (exp == 255 && mant != 0) + return 0; /* NaN -> 0 */ + exp = exp - 127 + scale; + if (exp < 0) + return 0; /* round towards zero */ + if (x & 0x80000000) { + /* negative => saturate to 0 */ + *vscrp |= VSCR_SAT; + return 0; + } + if (exp >= 32) { + /* saturate */ + *vscrp |= VSCR_SAT; + return 0xffffffff; + } + mant |= 0x800000; + mant = (mant << 8) >> (31 - exp); + return mant; +} + +/* Round to floating integer, towards 0 */ +static unsigned int rfiz(unsigned int x) +{ + int exp; + + exp = ((x >> 23) & 0xff) - 127; + if (exp == 128 && (x & 0x7fffff) != 0) + return x | 0x400000; /* NaN -> make it a QNaN */ + if (exp >= 23) + return x; /* it's an integer already (or Inf) */ + if (exp < 0) + return x & 0x80000000; /* |x| < 1.0 rounds to 0 */ + return x & ~(0x7fffff >> exp); +} + +/* Round to floating integer, towards +/- Inf */ +static unsigned int rfii(unsigned int x) +{ + int exp, mask; + + exp = ((x >> 23) & 0xff) - 127; + if (exp == 128 && (x & 0x7fffff) != 0) + return x | 0x400000; /* NaN -> make it a QNaN */ + if (exp >= 23) + return x; /* it's an integer already (or Inf) */ + if ((x & 0x7fffffff) == 0) + return x; /* +/-0 -> +/-0 */ + if (exp < 0) + /* 0 < |x| < 1.0 rounds to +/- 1.0 */ + return (x & 0x80000000) | 0x3f800000; + mask = 0x7fffff >> exp; + /* mantissa overflows into exponent - that's OK, + it can't overflow into the sign bit */ + return (x + mask) & ~mask; +} + +/* Round to floating integer, to nearest */ +static unsigned int rfin(unsigned int x) +{ + int exp, half; + + exp = ((x >> 23) & 0xff) - 127; + if (exp == 128 && (x & 0x7fffff) != 0) + return x | 0x400000; /* NaN -> make it a QNaN */ + if (exp >= 23) + return x; /* it's an integer already (or Inf) */ + if (exp < -1) + return x & 0x80000000; /* |x| < 0.5 -> +/-0 */ + if (exp == -1) + /* 0.5 <= |x| < 1.0 rounds to +/- 1.0 */ + return (x & 0x80000000) | 0x3f800000; + half = 0x400000 >> exp; + /* add 0.5 to the magnitude and chop off the fraction bits */ + return (x + half) & ~(0x7fffff >> exp); +} + +int emulate_altivec(struct pt_regs *regs) +{ + ppc_inst_t instr; + unsigned int i, word; + unsigned int va, vb, vc, vd; + vector128 *vrs; + + if (get_user_instr(instr, (void __user *)regs->nip)) + return -EFAULT; + + word = ppc_inst_val(instr); + if (ppc_inst_primary_opcode(instr) != 4) + return -EINVAL; /* not an altivec instruction */ + vd = (word >> 21) & 0x1f; + va = (word >> 16) & 0x1f; + vb = (word >> 11) & 0x1f; + vc = (word >> 6) & 0x1f; + + vrs = current->thread.vr_state.vr; + switch (word & 0x3f) { + case 10: + switch (vc) { + case 0: /* vaddfp */ + vaddfp(&vrs[vd], &vrs[va], &vrs[vb]); + break; + case 1: /* vsubfp */ + vsubfp(&vrs[vd], &vrs[va], &vrs[vb]); + break; + case 4: /* vrefp */ + vrefp(&vrs[vd], &vrs[vb]); + break; + case 5: /* vrsqrtefp */ + vrsqrtefp(&vrs[vd], &vrs[vb]); + break; + case 6: /* vexptefp */ + for (i = 0; i < 4; ++i) + vrs[vd].u[i] = eexp2(vrs[vb].u[i]); + break; + case 7: /* vlogefp */ + for (i = 0; i < 4; ++i) + vrs[vd].u[i] = elog2(vrs[vb].u[i]); + break; + case 8: /* vrfin */ + for (i = 0; i < 4; ++i) + vrs[vd].u[i] = rfin(vrs[vb].u[i]); + break; + case 9: /* vrfiz */ + for (i = 0; i < 4; ++i) + vrs[vd].u[i] = rfiz(vrs[vb].u[i]); + break; + case 10: /* vrfip */ + for (i = 0; i < 4; ++i) { + u32 x = vrs[vb].u[i]; + x = (x & 0x80000000)? rfiz(x): rfii(x); + vrs[vd].u[i] = x; + } + break; + case 11: /* vrfim */ + for (i = 0; i < 4; ++i) { + u32 x = vrs[vb].u[i]; + x = (x & 0x80000000)? rfii(x): rfiz(x); + vrs[vd].u[i] = x; + } + break; + case 14: /* vctuxs */ + for (i = 0; i < 4; ++i) + vrs[vd].u[i] = ctuxs(vrs[vb].u[i], va, + ¤t->thread.vr_state.vscr.u[3]); + break; + case 15: /* vctsxs */ + for (i = 0; i < 4; ++i) + vrs[vd].u[i] = ctsxs(vrs[vb].u[i], va, + ¤t->thread.vr_state.vscr.u[3]); + break; + default: + return -EINVAL; + } + break; + case 46: /* vmaddfp */ + vmaddfp(&vrs[vd], &vrs[va], &vrs[vb], &vrs[vc]); + break; + case 47: /* vnmsubfp */ + vnmsubfp(&vrs[vd], &vrs[va], &vrs[vb], &vrs[vc]); + break; + default: + return -EINVAL; + } + + return 0; +} diff --git a/arch/powerpc/kernel/vector.S b/arch/powerpc/kernel/vector.S new file mode 100644 index 000000000..99c1e7084 --- /dev/null +++ b/arch/powerpc/kernel/vector.S @@ -0,0 +1,346 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include <asm/processor.h> +#include <asm/ppc_asm.h> +#include <asm/reg.h> +#include <asm/asm-offsets.h> +#include <asm/cputable.h> +#include <asm/thread_info.h> +#include <asm/page.h> +#include <asm/ptrace.h> +#include <asm/export.h> +#include <asm/asm-compat.h> + +/* + * Load state from memory into VMX registers including VSCR. + * Assumes the caller has enabled VMX in the MSR. + */ +_GLOBAL(load_vr_state) + li r4,VRSTATE_VSCR + lvx v0,r4,r3 + mtvscr v0 + REST_32VRS(0,r4,r3) + blr +EXPORT_SYMBOL(load_vr_state) +_ASM_NOKPROBE_SYMBOL(load_vr_state); /* used by restore_math */ + +/* + * Store VMX state into memory, including VSCR. + * Assumes the caller has enabled VMX in the MSR. + */ +_GLOBAL(store_vr_state) + SAVE_32VRS(0, r4, r3) + mfvscr v0 + li r4, VRSTATE_VSCR + stvx v0, r4, r3 + lvx v0, 0, r3 + blr +EXPORT_SYMBOL(store_vr_state) + +/* + * Disable VMX for the task which had it previously, + * and save its vector registers in its thread_struct. + * Enables the VMX for use in the kernel on return. + * On SMP we know the VMX is free, since we give it up every + * switch (ie, no lazy save of the vector registers). + * + * Note that on 32-bit this can only use registers that will be + * restored by fast_exception_return, i.e. r3 - r6, r10 and r11. + */ +_GLOBAL(load_up_altivec) + mfmsr r5 /* grab the current MSR */ +#ifdef CONFIG_PPC_BOOK3S_64 + /* interrupt doesn't set MSR[RI] and HPT can fault on current access */ + ori r5,r5,MSR_RI +#endif + oris r5,r5,MSR_VEC@h + MTMSRD(r5) /* enable use of AltiVec now */ + isync + + /* + * While userspace in general ignores VRSAVE, glibc uses it as a boolean + * to optimise userspace context save/restore. Whenever we take an + * altivec unavailable exception we must set VRSAVE to something non + * zero. Set it to all 1s. See also the programming note in the ISA. + */ + mfspr r4,SPRN_VRSAVE + cmpwi 0,r4,0 + bne+ 1f + li r4,-1 + mtspr SPRN_VRSAVE,r4 +1: + /* enable use of VMX after return */ +#ifdef CONFIG_PPC32 + addi r5,r2,THREAD + oris r9,r9,MSR_VEC@h +#else + ld r4,PACACURRENT(r13) + addi r5,r4,THREAD /* Get THREAD */ + oris r12,r12,MSR_VEC@h + std r12,_MSR(r1) +#ifdef CONFIG_PPC_BOOK3S_64 + li r4,0 + stb r4,PACASRR_VALID(r13) +#endif +#endif + li r4,1 + stb r4,THREAD_LOAD_VEC(r5) + addi r6,r5,THREAD_VRSTATE + li r10,VRSTATE_VSCR + stw r4,THREAD_USED_VR(r5) + lvx v0,r10,r6 + mtvscr v0 + REST_32VRS(0,r4,r6) + /* restore registers and return */ + blr +_ASM_NOKPROBE_SYMBOL(load_up_altivec) + +/* + * save_altivec(tsk) + * Save the vector registers to its thread_struct + */ +_GLOBAL(save_altivec) + addi r3,r3,THREAD /* want THREAD of task */ + PPC_LL r7,THREAD_VRSAVEAREA(r3) + PPC_LL r5,PT_REGS(r3) + PPC_LCMPI 0,r7,0 + bne 2f + addi r7,r3,THREAD_VRSTATE +2: SAVE_32VRS(0,r4,r7) + mfvscr v0 + li r4,VRSTATE_VSCR + stvx v0,r4,r7 + lvx v0,0,r7 + blr + +#ifdef CONFIG_VSX + +#ifdef CONFIG_PPC32 +#error This asm code isn't ready for 32-bit kernels +#endif + +/* + * load_up_vsx(unused, unused, tsk) + * Disable VSX for the task which had it previously, + * and save its vector registers in its thread_struct. + * Reuse the fp and vsx saves, but first check to see if they have + * been saved already. + */ +_GLOBAL(load_up_vsx) +/* Load FP and VSX registers if they haven't been done yet */ + andi. r5,r12,MSR_FP + beql+ load_up_fpu /* skip if already loaded */ + andis. r5,r12,MSR_VEC@h + beql+ load_up_altivec /* skip if already loaded */ + +#ifdef CONFIG_PPC_BOOK3S_64 + /* interrupt doesn't set MSR[RI] and HPT can fault on current access */ + li r5,MSR_RI + mtmsrd r5,1 +#endif + + ld r4,PACACURRENT(r13) + addi r4,r4,THREAD /* Get THREAD */ + li r6,1 + stw r6,THREAD_USED_VSR(r4) /* ... also set thread used vsr */ + /* enable use of VSX after return */ + oris r12,r12,MSR_VSX@h + std r12,_MSR(r1) + li r4,0 + stb r4,PACASRR_VALID(r13) + b fast_interrupt_return_srr + +#endif /* CONFIG_VSX */ + + +/* + * The routines below are in assembler so we can closely control the + * usage of floating-point registers. These routines must be called + * with preempt disabled. + */ + .data +#ifdef CONFIG_PPC32 +fpzero: + .long 0 +fpone: + .long 0x3f800000 /* 1.0 in single-precision FP */ +fphalf: + .long 0x3f000000 /* 0.5 in single-precision FP */ + +#define LDCONST(fr, name) \ + lis r11,name@ha; \ + lfs fr,name@l(r11) +#else + +fpzero: + .quad 0 +fpone: + .quad 0x3ff0000000000000 /* 1.0 */ +fphalf: + .quad 0x3fe0000000000000 /* 0.5 */ + +#define LDCONST(fr, name) \ + addis r11,r2,name@toc@ha; \ + lfd fr,name@toc@l(r11) +#endif + .text +/* + * Internal routine to enable floating point and set FPSCR to 0. + * Don't call it from C; it doesn't use the normal calling convention. + */ +fpenable: +#ifdef CONFIG_PPC32 + stwu r1,-64(r1) +#else + stdu r1,-64(r1) +#endif + mfmsr r10 + ori r11,r10,MSR_FP + mtmsr r11 + isync + stfd fr0,24(r1) + stfd fr1,16(r1) + stfd fr31,8(r1) + LDCONST(fr1, fpzero) + mffs fr31 + MTFSF_L(fr1) + blr + +fpdisable: + mtlr r12 + MTFSF_L(fr31) + lfd fr31,8(r1) + lfd fr1,16(r1) + lfd fr0,24(r1) + mtmsr r10 + isync + addi r1,r1,64 + blr + +/* + * Vector add, floating point. + */ +_GLOBAL(vaddfp) + mflr r12 + bl fpenable + li r0,4 + mtctr r0 + li r6,0 +1: lfsx fr0,r4,r6 + lfsx fr1,r5,r6 + fadds fr0,fr0,fr1 + stfsx fr0,r3,r6 + addi r6,r6,4 + bdnz 1b + b fpdisable + +/* + * Vector subtract, floating point. + */ +_GLOBAL(vsubfp) + mflr r12 + bl fpenable + li r0,4 + mtctr r0 + li r6,0 +1: lfsx fr0,r4,r6 + lfsx fr1,r5,r6 + fsubs fr0,fr0,fr1 + stfsx fr0,r3,r6 + addi r6,r6,4 + bdnz 1b + b fpdisable + +/* + * Vector multiply and add, floating point. + */ +_GLOBAL(vmaddfp) + mflr r12 + bl fpenable + stfd fr2,32(r1) + li r0,4 + mtctr r0 + li r7,0 +1: lfsx fr0,r4,r7 + lfsx fr1,r5,r7 + lfsx fr2,r6,r7 + fmadds fr0,fr0,fr2,fr1 + stfsx fr0,r3,r7 + addi r7,r7,4 + bdnz 1b + lfd fr2,32(r1) + b fpdisable + +/* + * Vector negative multiply and subtract, floating point. + */ +_GLOBAL(vnmsubfp) + mflr r12 + bl fpenable + stfd fr2,32(r1) + li r0,4 + mtctr r0 + li r7,0 +1: lfsx fr0,r4,r7 + lfsx fr1,r5,r7 + lfsx fr2,r6,r7 + fnmsubs fr0,fr0,fr2,fr1 + stfsx fr0,r3,r7 + addi r7,r7,4 + bdnz 1b + lfd fr2,32(r1) + b fpdisable + +/* + * Vector reciprocal estimate. We just compute 1.0/x. + * r3 -> destination, r4 -> source. + */ +_GLOBAL(vrefp) + mflr r12 + bl fpenable + li r0,4 + LDCONST(fr1, fpone) + mtctr r0 + li r6,0 +1: lfsx fr0,r4,r6 + fdivs fr0,fr1,fr0 + stfsx fr0,r3,r6 + addi r6,r6,4 + bdnz 1b + b fpdisable + +/* + * Vector reciprocal square-root estimate, floating point. + * We use the frsqrte instruction for the initial estimate followed + * by 2 iterations of Newton-Raphson to get sufficient accuracy. + * r3 -> destination, r4 -> source. + */ +_GLOBAL(vrsqrtefp) + mflr r12 + bl fpenable + stfd fr2,32(r1) + stfd fr3,40(r1) + stfd fr4,48(r1) + stfd fr5,56(r1) + li r0,4 + LDCONST(fr4, fpone) + LDCONST(fr5, fphalf) + mtctr r0 + li r6,0 +1: lfsx fr0,r4,r6 + frsqrte fr1,fr0 /* r = frsqrte(s) */ + fmuls fr3,fr1,fr0 /* r * s */ + fmuls fr2,fr1,fr5 /* r * 0.5 */ + fnmsubs fr3,fr1,fr3,fr4 /* 1 - s * r * r */ + fmadds fr1,fr2,fr3,fr1 /* r = r + 0.5 * r * (1 - s * r * r) */ + fmuls fr3,fr1,fr0 /* r * s */ + fmuls fr2,fr1,fr5 /* r * 0.5 */ + fnmsubs fr3,fr1,fr3,fr4 /* 1 - s * r * r */ + fmadds fr1,fr2,fr3,fr1 /* r = r + 0.5 * r * (1 - s * r * r) */ + stfsx fr1,r3,r6 + addi r6,r6,4 + bdnz 1b + lfd fr5,56(r1) + lfd fr4,48(r1) + lfd fr3,40(r1) + lfd fr2,32(r1) + b fpdisable diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S new file mode 100644 index 000000000..a4c6efadc --- /dev/null +++ b/arch/powerpc/kernel/vmlinux.lds.S @@ -0,0 +1,422 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifdef CONFIG_PPC64 +#define PROVIDE32(x) PROVIDE(__unused__##x) +#else +#define PROVIDE32(x) PROVIDE(x) +#endif + +#define BSS_FIRST_SECTIONS *(.bss.prominit) +#define EMITS_PT_NOTE +#define RO_EXCEPTION_TABLE_ALIGN 0 +#define RUNTIME_DISCARD_EXIT + +#define SOFT_MASK_TABLE(align) \ + . = ALIGN(align); \ + __soft_mask_table : AT(ADDR(__soft_mask_table) - LOAD_OFFSET) { \ + __start___soft_mask_table = .; \ + KEEP(*(__soft_mask_table)) \ + __stop___soft_mask_table = .; \ + } + +#define RESTART_TABLE(align) \ + . = ALIGN(align); \ + __restart_table : AT(ADDR(__restart_table) - LOAD_OFFSET) { \ + __start___restart_table = .; \ + KEEP(*(__restart_table)) \ + __stop___restart_table = .; \ + } + +#include <asm/page.h> +#include <asm-generic/vmlinux.lds.h> +#include <asm/cache.h> +#include <asm/thread_info.h> + +#define STRICT_ALIGN_SIZE (1 << CONFIG_DATA_SHIFT) + +#if STRICT_ALIGN_SIZE < PAGE_SIZE +#error "CONFIG_DATA_SHIFT must be >= PAGE_SHIFT" +#endif + +ENTRY(_stext) + +PHDRS { + text PT_LOAD FLAGS(7); /* RWX */ + note PT_NOTE FLAGS(0); +} + +#ifdef CONFIG_PPC64 +OUTPUT_ARCH(powerpc:common64) +jiffies = jiffies_64; +#else +OUTPUT_ARCH(powerpc:common) +jiffies = jiffies_64 + 4; +#endif +SECTIONS +{ + . = KERNELBASE; + +/* + * Text, read only data and other permanent read-only sections + */ + + _text = .; + _stext = .; + + /* + * Head text. + * This needs to be in its own output section to avoid ld placing + * branch trampoline stubs randomly throughout the fixed sections, + * which it will do (even if the branch comes from another section) + * in order to optimize stub generation. + */ + .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { +#ifdef CONFIG_PPC64 + KEEP(*(.head.text.first_256B)); +#ifdef CONFIG_PPC_BOOK3E_64 +#else + KEEP(*(.head.text.real_vectors)); + *(.head.text.real_trampolines); + KEEP(*(.head.text.virt_vectors)); + *(.head.text.virt_trampolines); +# if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) + KEEP(*(.head.data.fwnmi_page)); +# endif +#endif +#else /* !CONFIG_PPC64 */ + HEAD_TEXT +#endif + } :text + + __head_end = .; + +#ifdef CONFIG_PPC64 + /* + * ALIGN(0) overrides the default output section alignment because + * this needs to start right after .head.text in order for fixed + * section placement to work. + */ + .text ALIGN(0) : AT(ADDR(.text) - LOAD_OFFSET) { +#ifdef CONFIG_LD_HEAD_STUB_CATCH + KEEP(*(.linker_stub_catch)); + . = . ; +#endif + +#else + .text : AT(ADDR(.text) - LOAD_OFFSET) { + ALIGN_FUNCTION(); +#endif + /* careful! __ftr_alt_* sections need to be close to .text */ + *(.text.hot .text.hot.* TEXT_MAIN .text.fixup .text.unlikely .text.unlikely.* .fixup __ftr_alt_* .ref.text); +#ifdef CONFIG_PPC64 + *(.tramp.ftrace.text); +#endif + NOINSTR_TEXT + SCHED_TEXT + CPUIDLE_TEXT + LOCK_TEXT + KPROBES_TEXT + IRQENTRY_TEXT + SOFTIRQENTRY_TEXT + /* + * -Os builds call FP save/restore functions. The powerpc64 + * linker generates those on demand in the .sfpr section. + * .sfpr gets placed at the beginning of a group of input + * sections, which can break start-of-text offset if it is + * included with the main text sections, so put it by itself. + */ + *(.sfpr); + MEM_KEEP(init.text) + MEM_KEEP(exit.text) + } :text + + . = ALIGN(PAGE_SIZE); + _etext = .; + PROVIDE32 (etext = .); + + /* Read-only data */ + RO_DATA(PAGE_SIZE) + +#ifdef CONFIG_PPC32 + .sdata2 : AT(ADDR(.sdata2) - LOAD_OFFSET) { + *(.sdata2) + } +#endif + + .data.rel.ro : AT(ADDR(.data.rel.ro) - LOAD_OFFSET) { + *(.data.rel.ro .data.rel.ro.*) + } + + .branch_lt : AT(ADDR(.branch_lt) - LOAD_OFFSET) { + *(.branch_lt) + } + +#ifdef CONFIG_PPC32 + .got1 : AT(ADDR(.got1) - LOAD_OFFSET) { + *(.got1) + } + .got2 : AT(ADDR(.got2) - LOAD_OFFSET) { + __got2_start = .; + *(.got2) + __got2_end = .; + } + .got : AT(ADDR(.got) - LOAD_OFFSET) { + *(.got) + *(.got.plt) + } + .plt : AT(ADDR(.plt) - LOAD_OFFSET) { + /* XXX: is .plt (and .got.plt) required? */ + *(.plt) + } + +#else /* CONFIG_PPC32 */ + .toc1 : AT(ADDR(.toc1) - LOAD_OFFSET) { + *(.toc1) + } + + .got : AT(ADDR(.got) - LOAD_OFFSET) ALIGN(256) { + *(.got .toc) + } + + SOFT_MASK_TABLE(8) + RESTART_TABLE(8) + +#ifdef CONFIG_PPC64_ELF_ABI_V1 + .opd : AT(ADDR(.opd) - LOAD_OFFSET) { + __start_opd = .; + KEEP(*(.opd)) + __end_opd = .; + } +#endif + + . = ALIGN(8); + __stf_entry_barrier_fixup : AT(ADDR(__stf_entry_barrier_fixup) - LOAD_OFFSET) { + __start___stf_entry_barrier_fixup = .; + *(__stf_entry_barrier_fixup) + __stop___stf_entry_barrier_fixup = .; + } + + . = ALIGN(8); + __uaccess_flush_fixup : AT(ADDR(__uaccess_flush_fixup) - LOAD_OFFSET) { + __start___uaccess_flush_fixup = .; + *(__uaccess_flush_fixup) + __stop___uaccess_flush_fixup = .; + } + + . = ALIGN(8); + __entry_flush_fixup : AT(ADDR(__entry_flush_fixup) - LOAD_OFFSET) { + __start___entry_flush_fixup = .; + *(__entry_flush_fixup) + __stop___entry_flush_fixup = .; + } + + . = ALIGN(8); + __scv_entry_flush_fixup : AT(ADDR(__scv_entry_flush_fixup) - LOAD_OFFSET) { + __start___scv_entry_flush_fixup = .; + *(__scv_entry_flush_fixup) + __stop___scv_entry_flush_fixup = .; + } + + . = ALIGN(8); + __stf_exit_barrier_fixup : AT(ADDR(__stf_exit_barrier_fixup) - LOAD_OFFSET) { + __start___stf_exit_barrier_fixup = .; + *(__stf_exit_barrier_fixup) + __stop___stf_exit_barrier_fixup = .; + } + + . = ALIGN(8); + __rfi_flush_fixup : AT(ADDR(__rfi_flush_fixup) - LOAD_OFFSET) { + __start___rfi_flush_fixup = .; + *(__rfi_flush_fixup) + __stop___rfi_flush_fixup = .; + } +#endif /* CONFIG_PPC32 */ + +#ifdef CONFIG_PPC_BARRIER_NOSPEC + . = ALIGN(8); + __spec_barrier_fixup : AT(ADDR(__spec_barrier_fixup) - LOAD_OFFSET) { + __start___barrier_nospec_fixup = .; + *(__barrier_nospec_fixup) + __stop___barrier_nospec_fixup = .; + } +#endif /* CONFIG_PPC_BARRIER_NOSPEC */ + +#ifdef CONFIG_PPC_E500 + . = ALIGN(8); + __spec_btb_flush_fixup : AT(ADDR(__spec_btb_flush_fixup) - LOAD_OFFSET) { + __start__btb_flush_fixup = .; + *(__btb_flush_fixup) + __stop__btb_flush_fixup = .; + } +#endif + + /* + * Various code relies on __init_begin being at the strict RWX boundary. + */ + . = ALIGN(STRICT_ALIGN_SIZE); + __srwx_boundary = .; + __end_rodata = .; + __init_begin = .; + +/* + * Init sections discarded at runtime + */ + .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { + _sinittext = .; + INIT_TEXT + + /* + *.init.text might be RO so we must ensure this section ends on + * a page boundary. + */ + . = ALIGN(PAGE_SIZE); + _einittext = .; +#ifdef CONFIG_PPC64 + *(.tramp.ftrace.init); +#endif + } :text + + /* .exit.text is discarded at runtime, not link time, + * to deal with references from __bug_table + */ + .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) { + EXIT_TEXT + } + + . = ALIGN(PAGE_SIZE); + + INIT_DATA_SECTION(16) + + . = ALIGN(8); + __ftr_fixup : AT(ADDR(__ftr_fixup) - LOAD_OFFSET) { + __start___ftr_fixup = .; + KEEP(*(__ftr_fixup)) + __stop___ftr_fixup = .; + } + . = ALIGN(8); + __mmu_ftr_fixup : AT(ADDR(__mmu_ftr_fixup) - LOAD_OFFSET) { + __start___mmu_ftr_fixup = .; + KEEP(*(__mmu_ftr_fixup)) + __stop___mmu_ftr_fixup = .; + } + . = ALIGN(8); + __lwsync_fixup : AT(ADDR(__lwsync_fixup) - LOAD_OFFSET) { + __start___lwsync_fixup = .; + KEEP(*(__lwsync_fixup)) + __stop___lwsync_fixup = .; + } +#ifdef CONFIG_PPC64 + . = ALIGN(8); + __fw_ftr_fixup : AT(ADDR(__fw_ftr_fixup) - LOAD_OFFSET) { + __start___fw_ftr_fixup = .; + KEEP(*(__fw_ftr_fixup)) + __stop___fw_ftr_fixup = .; + } +#endif + + PERCPU_SECTION(L1_CACHE_BYTES) + + . = ALIGN(8); + .machine.desc : AT(ADDR(.machine.desc) - LOAD_OFFSET) { + __machine_desc_start = . ; + KEEP(*(.machine.desc)) + __machine_desc_end = . ; + } +#ifdef CONFIG_RELOCATABLE + . = ALIGN(8); + .dynsym : AT(ADDR(.dynsym) - LOAD_OFFSET) + { + __dynamic_symtab = .; + *(.dynsym) + } + .dynstr : AT(ADDR(.dynstr) - LOAD_OFFSET) { *(.dynstr) } + .dynamic : AT(ADDR(.dynamic) - LOAD_OFFSET) + { + __dynamic_start = .; + *(.dynamic) + } + .hash : AT(ADDR(.hash) - LOAD_OFFSET) { *(.hash) } + .gnu.hash : AT(ADDR(.gnu.hash) - LOAD_OFFSET) { *(.gnu.hash) } + .interp : AT(ADDR(.interp) - LOAD_OFFSET) { *(.interp) } + .rela.dyn : AT(ADDR(.rela.dyn) - LOAD_OFFSET) + { + __rela_dyn_start = .; + *(.rela*) + } +#endif + /* .exit.data is discarded at runtime, not link time, + * to deal with references from .exit.text + */ + .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) { + EXIT_DATA + } + + /* freed after init ends here */ + . = ALIGN(PAGE_SIZE); + __init_end = .; + +/* + * And now the various read/write data + */ + + . = ALIGN(PAGE_SIZE); + _sdata = .; + + .data : AT(ADDR(.data) - LOAD_OFFSET) { + DATA_DATA + *(.data.rel*) +#ifdef CONFIG_PPC32 + *(SDATA_MAIN) +#endif + } + + /* The initial task and kernel stack */ + INIT_TASK_DATA_SECTION(THREAD_ALIGN) + + .data..page_aligned : AT(ADDR(.data..page_aligned) - LOAD_OFFSET) { + PAGE_ALIGNED_DATA(PAGE_SIZE) + } + + .data..cacheline_aligned : AT(ADDR(.data..cacheline_aligned) - LOAD_OFFSET) { + CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES) + } + + .data..read_mostly : AT(ADDR(.data..read_mostly) - LOAD_OFFSET) { + READ_MOSTLY_DATA(L1_CACHE_BYTES) + } + + . = ALIGN(PAGE_SIZE); + .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) { + NOSAVE_DATA + } + + BUG_TABLE + + . = ALIGN(PAGE_SIZE); + _edata = .; + PROVIDE32 (edata = .); + +/* + * And finally the bss + */ + + BSS_SECTION(0, 0, 0) + + . = ALIGN(PAGE_SIZE); + _end = . ; + PROVIDE32 (end = .); + + DWARF_DEBUG + ELF_DETAILS + + DISCARDS + /DISCARD/ : { + *(*.EMB.apuinfo) + *(.glink .iplt .plt .comment) + *(.gnu.version*) + *(.gnu.attributes) + *(.eh_frame) +#ifndef CONFIG_RELOCATABLE + *(.rela*) +#endif + } +} diff --git a/arch/powerpc/kernel/watchdog.c b/arch/powerpc/kernel/watchdog.c new file mode 100644 index 000000000..dbcc4a793 --- /dev/null +++ b/arch/powerpc/kernel/watchdog.c @@ -0,0 +1,591 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Watchdog support on powerpc systems. + * + * Copyright 2017, IBM Corporation. + * + * This uses code from arch/sparc/kernel/nmi.c and kernel/watchdog.c + */ + +#define pr_fmt(fmt) "watchdog: " fmt + +#include <linux/kernel.h> +#include <linux/param.h> +#include <linux/init.h> +#include <linux/percpu.h> +#include <linux/cpu.h> +#include <linux/nmi.h> +#include <linux/module.h> +#include <linux/export.h> +#include <linux/kprobes.h> +#include <linux/hardirq.h> +#include <linux/reboot.h> +#include <linux/slab.h> +#include <linux/kdebug.h> +#include <linux/sched/debug.h> +#include <linux/delay.h> +#include <linux/processor.h> +#include <linux/smp.h> + +#include <asm/interrupt.h> +#include <asm/paca.h> +#include <asm/nmi.h> + +/* + * The powerpc watchdog ensures that each CPU is able to service timers. + * The watchdog sets up a simple timer on each CPU to run once per timer + * period, and updates a per-cpu timestamp and a "pending" cpumask. This is + * the heartbeat. + * + * Then there are two systems to check that the heartbeat is still running. + * The local soft-NMI, and the SMP checker. + * + * The soft-NMI checker can detect lockups on the local CPU. When interrupts + * are disabled with local_irq_disable(), platforms that use soft-masking + * can leave hardware interrupts enabled and handle them with a masked + * interrupt handler. The masked handler can send the timer interrupt to the + * watchdog's soft_nmi_interrupt(), which appears to Linux as an NMI + * interrupt, and can be used to detect CPUs stuck with IRQs disabled. + * + * The soft-NMI checker will compare the heartbeat timestamp for this CPU + * with the current time, and take action if the difference exceeds the + * watchdog threshold. + * + * The limitation of the soft-NMI watchdog is that it does not work when + * interrupts are hard disabled or otherwise not being serviced. This is + * solved by also having a SMP watchdog where all CPUs check all other + * CPUs heartbeat. + * + * The SMP checker can detect lockups on other CPUs. A global "pending" + * cpumask is kept, containing all CPUs which enable the watchdog. Each + * CPU clears their pending bit in their heartbeat timer. When the bitmask + * becomes empty, the last CPU to clear its pending bit updates a global + * timestamp and refills the pending bitmask. + * + * In the heartbeat timer, if any CPU notices that the global timestamp has + * not been updated for a period exceeding the watchdog threshold, then it + * means the CPU(s) with their bit still set in the pending mask have had + * their heartbeat stop, and action is taken. + * + * Some platforms implement true NMI IPIs, which can be used by the SMP + * watchdog to detect an unresponsive CPU and pull it out of its stuck + * state with the NMI IPI, to get crash/debug data from it. This way the + * SMP watchdog can detect hardware interrupts off lockups. + */ + +static cpumask_t wd_cpus_enabled __read_mostly; + +static u64 wd_panic_timeout_tb __read_mostly; /* timebase ticks until panic */ +static u64 wd_smp_panic_timeout_tb __read_mostly; /* panic other CPUs */ + +static u64 wd_timer_period_ms __read_mostly; /* interval between heartbeat */ + +static DEFINE_PER_CPU(struct hrtimer, wd_hrtimer); +static DEFINE_PER_CPU(u64, wd_timer_tb); + +/* SMP checker bits */ +static unsigned long __wd_smp_lock; +static unsigned long __wd_reporting; +static unsigned long __wd_nmi_output; +static cpumask_t wd_smp_cpus_pending; +static cpumask_t wd_smp_cpus_stuck; +static u64 wd_smp_last_reset_tb; + +#ifdef CONFIG_PPC_PSERIES +static u64 wd_timeout_pct; +#endif + +/* + * Try to take the exclusive watchdog action / NMI IPI / printing lock. + * wd_smp_lock must be held. If this fails, we should return and wait + * for the watchdog to kick in again (or another CPU to trigger it). + * + * Importantly, if hardlockup_panic is set, wd_try_report failure should + * not delay the panic, because whichever other CPU is reporting will + * call panic. + */ +static bool wd_try_report(void) +{ + if (__wd_reporting) + return false; + __wd_reporting = 1; + return true; +} + +/* End printing after successful wd_try_report. wd_smp_lock not required. */ +static void wd_end_reporting(void) +{ + smp_mb(); /* End printing "critical section" */ + WARN_ON_ONCE(__wd_reporting == 0); + WRITE_ONCE(__wd_reporting, 0); +} + +static inline void wd_smp_lock(unsigned long *flags) +{ + /* + * Avoid locking layers if possible. + * This may be called from low level interrupt handlers at some + * point in future. + */ + raw_local_irq_save(*flags); + hard_irq_disable(); /* Make it soft-NMI safe */ + while (unlikely(test_and_set_bit_lock(0, &__wd_smp_lock))) { + raw_local_irq_restore(*flags); + spin_until_cond(!test_bit(0, &__wd_smp_lock)); + raw_local_irq_save(*flags); + hard_irq_disable(); + } +} + +static inline void wd_smp_unlock(unsigned long *flags) +{ + clear_bit_unlock(0, &__wd_smp_lock); + raw_local_irq_restore(*flags); +} + +static void wd_lockup_ipi(struct pt_regs *regs) +{ + int cpu = raw_smp_processor_id(); + u64 tb = get_tb(); + + pr_emerg("CPU %d Hard LOCKUP\n", cpu); + pr_emerg("CPU %d TB:%lld, last heartbeat TB:%lld (%lldms ago)\n", + cpu, tb, per_cpu(wd_timer_tb, cpu), + tb_to_ns(tb - per_cpu(wd_timer_tb, cpu)) / 1000000); + print_modules(); + print_irqtrace_events(current); + if (regs) + show_regs(regs); + else + dump_stack(); + + /* + * __wd_nmi_output must be set after we printk from NMI context. + * + * printk from NMI context defers printing to the console to irq_work. + * If that NMI was taken in some code that is hard-locked, then irqs + * are disabled so irq_work will never fire. That can result in the + * hard lockup messages being delayed (indefinitely, until something + * else kicks the console drivers). + * + * Setting __wd_nmi_output will cause another CPU to notice and kick + * the console drivers for us. + * + * xchg is not needed here (it could be a smp_mb and store), but xchg + * gives the memory ordering and atomicity required. + */ + xchg(&__wd_nmi_output, 1); + + /* Do not panic from here because that can recurse into NMI IPI layer */ +} + +static bool set_cpu_stuck(int cpu) +{ + cpumask_set_cpu(cpu, &wd_smp_cpus_stuck); + cpumask_clear_cpu(cpu, &wd_smp_cpus_pending); + /* + * See wd_smp_clear_cpu_pending() + */ + smp_mb(); + if (cpumask_empty(&wd_smp_cpus_pending)) { + wd_smp_last_reset_tb = get_tb(); + cpumask_andnot(&wd_smp_cpus_pending, + &wd_cpus_enabled, + &wd_smp_cpus_stuck); + return true; + } + return false; +} + +static void watchdog_smp_panic(int cpu) +{ + static cpumask_t wd_smp_cpus_ipi; // protected by reporting + unsigned long flags; + u64 tb, last_reset; + int c; + + wd_smp_lock(&flags); + /* Double check some things under lock */ + tb = get_tb(); + last_reset = wd_smp_last_reset_tb; + if ((s64)(tb - last_reset) < (s64)wd_smp_panic_timeout_tb) + goto out; + if (cpumask_test_cpu(cpu, &wd_smp_cpus_pending)) + goto out; + if (!wd_try_report()) + goto out; + for_each_online_cpu(c) { + if (!cpumask_test_cpu(c, &wd_smp_cpus_pending)) + continue; + if (c == cpu) + continue; // should not happen + + __cpumask_set_cpu(c, &wd_smp_cpus_ipi); + if (set_cpu_stuck(c)) + break; + } + if (cpumask_empty(&wd_smp_cpus_ipi)) { + wd_end_reporting(); + goto out; + } + wd_smp_unlock(&flags); + + pr_emerg("CPU %d detected hard LOCKUP on other CPUs %*pbl\n", + cpu, cpumask_pr_args(&wd_smp_cpus_ipi)); + pr_emerg("CPU %d TB:%lld, last SMP heartbeat TB:%lld (%lldms ago)\n", + cpu, tb, last_reset, tb_to_ns(tb - last_reset) / 1000000); + + if (!sysctl_hardlockup_all_cpu_backtrace) { + /* + * Try to trigger the stuck CPUs, unless we are going to + * get a backtrace on all of them anyway. + */ + for_each_cpu(c, &wd_smp_cpus_ipi) { + smp_send_nmi_ipi(c, wd_lockup_ipi, 1000000); + __cpumask_clear_cpu(c, &wd_smp_cpus_ipi); + } + } else { + trigger_allbutself_cpu_backtrace(); + cpumask_clear(&wd_smp_cpus_ipi); + } + + if (hardlockup_panic) + nmi_panic(NULL, "Hard LOCKUP"); + + wd_end_reporting(); + + return; + +out: + wd_smp_unlock(&flags); +} + +static void wd_smp_clear_cpu_pending(int cpu) +{ + if (!cpumask_test_cpu(cpu, &wd_smp_cpus_pending)) { + if (unlikely(cpumask_test_cpu(cpu, &wd_smp_cpus_stuck))) { + struct pt_regs *regs = get_irq_regs(); + unsigned long flags; + + pr_emerg("CPU %d became unstuck TB:%lld\n", + cpu, get_tb()); + print_irqtrace_events(current); + if (regs) + show_regs(regs); + else + dump_stack(); + + wd_smp_lock(&flags); + cpumask_clear_cpu(cpu, &wd_smp_cpus_stuck); + wd_smp_unlock(&flags); + } else { + /* + * The last CPU to clear pending should have reset the + * watchdog so we generally should not find it empty + * here if our CPU was clear. However it could happen + * due to a rare race with another CPU taking the + * last CPU out of the mask concurrently. + * + * We can't add a warning for it. But just in case + * there is a problem with the watchdog that is causing + * the mask to not be reset, try to kick it along here. + */ + if (unlikely(cpumask_empty(&wd_smp_cpus_pending))) + goto none_pending; + } + return; + } + + /* + * All other updates to wd_smp_cpus_pending are performed under + * wd_smp_lock. All of them are atomic except the case where the + * mask becomes empty and is reset. This will not happen here because + * cpu was tested to be in the bitmap (above), and a CPU only clears + * its own bit. _Except_ in the case where another CPU has detected a + * hard lockup on our CPU and takes us out of the pending mask. So in + * normal operation there will be no race here, no problem. + * + * In the lockup case, this atomic clear-bit vs a store that refills + * other bits in the accessed word wll not be a problem. The bit clear + * is atomic so it will not cause the store to get lost, and the store + * will never set this bit so it will not overwrite the bit clear. The + * only way for a stuck CPU to return to the pending bitmap is to + * become unstuck itself. + */ + cpumask_clear_cpu(cpu, &wd_smp_cpus_pending); + + /* + * Order the store to clear pending with the load(s) to check all + * words in the pending mask to check they are all empty. This orders + * with the same barrier on another CPU. This prevents two CPUs + * clearing the last 2 pending bits, but neither seeing the other's + * store when checking if the mask is empty, and missing an empty + * mask, which ends with a false positive. + */ + smp_mb(); + if (cpumask_empty(&wd_smp_cpus_pending)) { + unsigned long flags; + +none_pending: + /* + * Double check under lock because more than one CPU could see + * a clear mask with the lockless check after clearing their + * pending bits. + */ + wd_smp_lock(&flags); + if (cpumask_empty(&wd_smp_cpus_pending)) { + wd_smp_last_reset_tb = get_tb(); + cpumask_andnot(&wd_smp_cpus_pending, + &wd_cpus_enabled, + &wd_smp_cpus_stuck); + } + wd_smp_unlock(&flags); + } +} + +static void watchdog_timer_interrupt(int cpu) +{ + u64 tb = get_tb(); + + per_cpu(wd_timer_tb, cpu) = tb; + + wd_smp_clear_cpu_pending(cpu); + + if ((s64)(tb - wd_smp_last_reset_tb) >= (s64)wd_smp_panic_timeout_tb) + watchdog_smp_panic(cpu); + + if (__wd_nmi_output && xchg(&__wd_nmi_output, 0)) { + /* + * Something has called printk from NMI context. It might be + * stuck, so this triggers a flush that will get that + * printk output to the console. + * + * See wd_lockup_ipi. + */ + printk_trigger_flush(); + } +} + +DEFINE_INTERRUPT_HANDLER_NMI(soft_nmi_interrupt) +{ + unsigned long flags; + int cpu = raw_smp_processor_id(); + u64 tb; + + /* should only arrive from kernel, with irqs disabled */ + WARN_ON_ONCE(!arch_irq_disabled_regs(regs)); + + if (!cpumask_test_cpu(cpu, &wd_cpus_enabled)) + return 0; + + __this_cpu_inc(irq_stat.soft_nmi_irqs); + + tb = get_tb(); + if (tb - per_cpu(wd_timer_tb, cpu) >= wd_panic_timeout_tb) { + /* + * Taking wd_smp_lock here means it is a soft-NMI lock, which + * means we can't take any regular or irqsafe spin locks while + * holding this lock. This is why timers can't printk while + * holding the lock. + */ + wd_smp_lock(&flags); + if (cpumask_test_cpu(cpu, &wd_smp_cpus_stuck)) { + wd_smp_unlock(&flags); + return 0; + } + if (!wd_try_report()) { + wd_smp_unlock(&flags); + /* Couldn't report, try again in 100ms */ + mtspr(SPRN_DEC, 100 * tb_ticks_per_usec * 1000); + return 0; + } + + set_cpu_stuck(cpu); + + wd_smp_unlock(&flags); + + pr_emerg("CPU %d self-detected hard LOCKUP @ %pS\n", + cpu, (void *)regs->nip); + pr_emerg("CPU %d TB:%lld, last heartbeat TB:%lld (%lldms ago)\n", + cpu, tb, per_cpu(wd_timer_tb, cpu), + tb_to_ns(tb - per_cpu(wd_timer_tb, cpu)) / 1000000); + print_modules(); + print_irqtrace_events(current); + show_regs(regs); + + xchg(&__wd_nmi_output, 1); // see wd_lockup_ipi + + if (sysctl_hardlockup_all_cpu_backtrace) + trigger_allbutself_cpu_backtrace(); + + if (hardlockup_panic) + nmi_panic(regs, "Hard LOCKUP"); + + wd_end_reporting(); + } + /* + * We are okay to change DEC in soft_nmi_interrupt because the masked + * handler has marked a DEC as pending, so the timer interrupt will be + * replayed as soon as local irqs are enabled again. + */ + if (wd_panic_timeout_tb < 0x7fffffff) + mtspr(SPRN_DEC, wd_panic_timeout_tb); + + return 0; +} + +static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer) +{ + int cpu = smp_processor_id(); + + if (!(watchdog_enabled & NMI_WATCHDOG_ENABLED)) + return HRTIMER_NORESTART; + + if (!cpumask_test_cpu(cpu, &watchdog_cpumask)) + return HRTIMER_NORESTART; + + watchdog_timer_interrupt(cpu); + + hrtimer_forward_now(hrtimer, ms_to_ktime(wd_timer_period_ms)); + + return HRTIMER_RESTART; +} + +void arch_touch_nmi_watchdog(void) +{ + unsigned long ticks = tb_ticks_per_usec * wd_timer_period_ms * 1000; + int cpu = smp_processor_id(); + u64 tb; + + if (!cpumask_test_cpu(cpu, &watchdog_cpumask)) + return; + + tb = get_tb(); + if (tb - per_cpu(wd_timer_tb, cpu) >= ticks) { + per_cpu(wd_timer_tb, cpu) = tb; + wd_smp_clear_cpu_pending(cpu); + } +} +EXPORT_SYMBOL(arch_touch_nmi_watchdog); + +static void start_watchdog(void *arg) +{ + struct hrtimer *hrtimer = this_cpu_ptr(&wd_hrtimer); + int cpu = smp_processor_id(); + unsigned long flags; + + if (cpumask_test_cpu(cpu, &wd_cpus_enabled)) { + WARN_ON(1); + return; + } + + if (!(watchdog_enabled & NMI_WATCHDOG_ENABLED)) + return; + + if (!cpumask_test_cpu(cpu, &watchdog_cpumask)) + return; + + wd_smp_lock(&flags); + cpumask_set_cpu(cpu, &wd_cpus_enabled); + if (cpumask_weight(&wd_cpus_enabled) == 1) { + cpumask_set_cpu(cpu, &wd_smp_cpus_pending); + wd_smp_last_reset_tb = get_tb(); + } + wd_smp_unlock(&flags); + + *this_cpu_ptr(&wd_timer_tb) = get_tb(); + + hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + hrtimer->function = watchdog_timer_fn; + hrtimer_start(hrtimer, ms_to_ktime(wd_timer_period_ms), + HRTIMER_MODE_REL_PINNED); +} + +static int start_watchdog_on_cpu(unsigned int cpu) +{ + return smp_call_function_single(cpu, start_watchdog, NULL, true); +} + +static void stop_watchdog(void *arg) +{ + struct hrtimer *hrtimer = this_cpu_ptr(&wd_hrtimer); + int cpu = smp_processor_id(); + unsigned long flags; + + if (!cpumask_test_cpu(cpu, &wd_cpus_enabled)) + return; /* Can happen in CPU unplug case */ + + hrtimer_cancel(hrtimer); + + wd_smp_lock(&flags); + cpumask_clear_cpu(cpu, &wd_cpus_enabled); + wd_smp_unlock(&flags); + + wd_smp_clear_cpu_pending(cpu); +} + +static int stop_watchdog_on_cpu(unsigned int cpu) +{ + return smp_call_function_single(cpu, stop_watchdog, NULL, true); +} + +static void watchdog_calc_timeouts(void) +{ + u64 threshold = watchdog_thresh; + +#ifdef CONFIG_PPC_PSERIES + threshold += (READ_ONCE(wd_timeout_pct) * threshold) / 100; +#endif + + wd_panic_timeout_tb = threshold * ppc_tb_freq; + + /* Have the SMP detector trigger a bit later */ + wd_smp_panic_timeout_tb = wd_panic_timeout_tb * 3 / 2; + + /* 2/5 is the factor that the perf based detector uses */ + wd_timer_period_ms = watchdog_thresh * 1000 * 2 / 5; +} + +void watchdog_nmi_stop(void) +{ + int cpu; + + for_each_cpu(cpu, &wd_cpus_enabled) + stop_watchdog_on_cpu(cpu); +} + +void watchdog_nmi_start(void) +{ + int cpu; + + watchdog_calc_timeouts(); + for_each_cpu_and(cpu, cpu_online_mask, &watchdog_cpumask) + start_watchdog_on_cpu(cpu); +} + +/* + * Invoked from core watchdog init. + */ +int __init watchdog_nmi_probe(void) +{ + int err; + + err = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, + "powerpc/watchdog:online", + start_watchdog_on_cpu, + stop_watchdog_on_cpu); + if (err < 0) { + pr_warn("could not be initialized"); + return err; + } + return 0; +} + +#ifdef CONFIG_PPC_PSERIES +void watchdog_nmi_set_timeout_pct(u64 pct) +{ + pr_info("Set the NMI watchdog timeout factor to %llu%%\n", pct); + WRITE_ONCE(wd_timeout_pct, pct); + lockup_detector_reconfigure(); +} +#endif |