diff options
Diffstat (limited to 'arch/sparc/kernel/traps_64.c')
| -rw-r--r-- | arch/sparc/kernel/traps_64.c | 2924 |
1 files changed, 2924 insertions, 0 deletions
diff --git a/arch/sparc/kernel/traps_64.c b/arch/sparc/kernel/traps_64.c new file mode 100644 index 0000000000..08ffd17d5e --- /dev/null +++ b/arch/sparc/kernel/traps_64.c @@ -0,0 +1,2924 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* arch/sparc64/kernel/traps.c + * + * Copyright (C) 1995,1997,2008,2009,2012 David S. Miller (davem@davemloft.net) + * Copyright (C) 1997,1999,2000 Jakub Jelinek (jakub@redhat.com) + */ + +/* + * I like traps on v9, :)))) + */ + +#include <linux/extable.h> +#include <linux/sched/mm.h> +#include <linux/sched/debug.h> +#include <linux/linkage.h> +#include <linux/kernel.h> +#include <linux/signal.h> +#include <linux/smp.h> +#include <linux/mm.h> +#include <linux/init.h> +#include <linux/kallsyms.h> +#include <linux/kdebug.h> +#include <linux/ftrace.h> +#include <linux/reboot.h> +#include <linux/gfp.h> +#include <linux/context_tracking.h> + +#include <asm/smp.h> +#include <asm/delay.h> +#include <asm/ptrace.h> +#include <asm/oplib.h> +#include <asm/page.h> +#include <asm/unistd.h> +#include <linux/uaccess.h> +#include <asm/fpumacro.h> +#include <asm/lsu.h> +#include <asm/dcu.h> +#include <asm/estate.h> +#include <asm/chafsr.h> +#include <asm/sfafsr.h> +#include <asm/psrcompat.h> +#include <asm/processor.h> +#include <asm/timer.h> +#include <asm/head.h> +#include <asm/prom.h> +#include <asm/memctrl.h> +#include <asm/cacheflush.h> +#include <asm/setup.h> + +#include "entry.h" +#include "kernel.h" +#include "kstack.h" + +/* When an irrecoverable trap occurs at tl > 0, the trap entry + * code logs the trap state registers at every level in the trap + * stack. It is found at (pt_regs + sizeof(pt_regs)) and the layout + * is as follows: + */ +struct tl1_traplog { + struct { + unsigned long tstate; + unsigned long tpc; + unsigned long tnpc; + unsigned long tt; + } trapstack[4]; + unsigned long tl; +}; + +static void dump_tl1_traplog(struct tl1_traplog *p) +{ + int i, limit; + + printk(KERN_EMERG "TRAPLOG: Error at trap level 0x%lx, " + "dumping track stack.\n", p->tl); + + limit = (tlb_type == hypervisor) ? 2 : 4; + for (i = 0; i < limit; i++) { + printk(KERN_EMERG + "TRAPLOG: Trap level %d TSTATE[%016lx] TPC[%016lx] " + "TNPC[%016lx] TT[%lx]\n", + i + 1, + p->trapstack[i].tstate, p->trapstack[i].tpc, + p->trapstack[i].tnpc, p->trapstack[i].tt); + printk("TRAPLOG: TPC<%pS>\n", (void *) p->trapstack[i].tpc); + } +} + +void bad_trap(struct pt_regs *regs, long lvl) +{ + char buffer[36]; + + if (notify_die(DIE_TRAP, "bad trap", regs, + 0, lvl, SIGTRAP) == NOTIFY_STOP) + return; + + if (lvl < 0x100) { + sprintf(buffer, "Bad hw trap %lx at tl0\n", lvl); + die_if_kernel(buffer, regs); + } + + lvl -= 0x100; + if (regs->tstate & TSTATE_PRIV) { + sprintf(buffer, "Kernel bad sw trap %lx", lvl); + die_if_kernel(buffer, regs); + } + if (test_thread_flag(TIF_32BIT)) { + regs->tpc &= 0xffffffff; + regs->tnpc &= 0xffffffff; + } + force_sig_fault_trapno(SIGILL, ILL_ILLTRP, + (void __user *)regs->tpc, lvl); +} + +void bad_trap_tl1(struct pt_regs *regs, long lvl) +{ + char buffer[36]; + + if (notify_die(DIE_TRAP_TL1, "bad trap tl1", regs, + 0, lvl, SIGTRAP) == NOTIFY_STOP) + return; + + dump_tl1_traplog((struct tl1_traplog *)(regs + 1)); + + sprintf (buffer, "Bad trap %lx at tl>0", lvl); + die_if_kernel (buffer, regs); +} + +#ifdef CONFIG_DEBUG_BUGVERBOSE +void do_BUG(const char *file, int line) +{ + bust_spinlocks(1); + printk("kernel BUG at %s:%d!\n", file, line); +} +EXPORT_SYMBOL(do_BUG); +#endif + +static DEFINE_SPINLOCK(dimm_handler_lock); +static dimm_printer_t dimm_handler; + +static int sprintf_dimm(int synd_code, unsigned long paddr, char *buf, int buflen) +{ + unsigned long flags; + int ret = -ENODEV; + + spin_lock_irqsave(&dimm_handler_lock, flags); + if (dimm_handler) { + ret = dimm_handler(synd_code, paddr, buf, buflen); + } else if (tlb_type == spitfire) { + if (prom_getunumber(synd_code, paddr, buf, buflen) == -1) + ret = -EINVAL; + else + ret = 0; + } else + ret = -ENODEV; + spin_unlock_irqrestore(&dimm_handler_lock, flags); + + return ret; +} + +int register_dimm_printer(dimm_printer_t func) +{ + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&dimm_handler_lock, flags); + if (!dimm_handler) + dimm_handler = func; + else + ret = -EEXIST; + spin_unlock_irqrestore(&dimm_handler_lock, flags); + + return ret; +} +EXPORT_SYMBOL_GPL(register_dimm_printer); + +void unregister_dimm_printer(dimm_printer_t func) +{ + unsigned long flags; + + spin_lock_irqsave(&dimm_handler_lock, flags); + if (dimm_handler == func) + dimm_handler = NULL; + spin_unlock_irqrestore(&dimm_handler_lock, flags); +} +EXPORT_SYMBOL_GPL(unregister_dimm_printer); + +void spitfire_insn_access_exception(struct pt_regs *regs, unsigned long sfsr, unsigned long sfar) +{ + enum ctx_state prev_state = exception_enter(); + + if (notify_die(DIE_TRAP, "instruction access exception", regs, + 0, 0x8, SIGTRAP) == NOTIFY_STOP) + goto out; + + if (regs->tstate & TSTATE_PRIV) { + printk("spitfire_insn_access_exception: SFSR[%016lx] " + "SFAR[%016lx], going.\n", sfsr, sfar); + die_if_kernel("Iax", regs); + } + if (test_thread_flag(TIF_32BIT)) { + regs->tpc &= 0xffffffff; + regs->tnpc &= 0xffffffff; + } + force_sig_fault(SIGSEGV, SEGV_MAPERR, (void __user *)regs->tpc); +out: + exception_exit(prev_state); +} + +void spitfire_insn_access_exception_tl1(struct pt_regs *regs, unsigned long sfsr, unsigned long sfar) +{ + if (notify_die(DIE_TRAP_TL1, "instruction access exception tl1", regs, + 0, 0x8, SIGTRAP) == NOTIFY_STOP) + return; + + dump_tl1_traplog((struct tl1_traplog *)(regs + 1)); + spitfire_insn_access_exception(regs, sfsr, sfar); +} + +void sun4v_insn_access_exception(struct pt_regs *regs, unsigned long addr, unsigned long type_ctx) +{ + unsigned short type = (type_ctx >> 16); + unsigned short ctx = (type_ctx & 0xffff); + + if (notify_die(DIE_TRAP, "instruction access exception", regs, + 0, 0x8, SIGTRAP) == NOTIFY_STOP) + return; + + if (regs->tstate & TSTATE_PRIV) { + printk("sun4v_insn_access_exception: ADDR[%016lx] " + "CTX[%04x] TYPE[%04x], going.\n", + addr, ctx, type); + die_if_kernel("Iax", regs); + } + + if (test_thread_flag(TIF_32BIT)) { + regs->tpc &= 0xffffffff; + regs->tnpc &= 0xffffffff; + } + force_sig_fault(SIGSEGV, SEGV_MAPERR, (void __user *) addr); +} + +void sun4v_insn_access_exception_tl1(struct pt_regs *regs, unsigned long addr, unsigned long type_ctx) +{ + if (notify_die(DIE_TRAP_TL1, "instruction access exception tl1", regs, + 0, 0x8, SIGTRAP) == NOTIFY_STOP) + return; + + dump_tl1_traplog((struct tl1_traplog *)(regs + 1)); + sun4v_insn_access_exception(regs, addr, type_ctx); +} + +bool is_no_fault_exception(struct pt_regs *regs) +{ + unsigned char asi; + u32 insn; + + if (get_user(insn, (u32 __user *)regs->tpc) == -EFAULT) + return false; + + /* + * Must do a little instruction decoding here in order to + * decide on a course of action. The bits of interest are: + * insn[31:30] = op, where 3 indicates the load/store group + * insn[24:19] = op3, which identifies individual opcodes + * insn[13] indicates an immediate offset + * op3[4]=1 identifies alternate space instructions + * op3[5:4]=3 identifies floating point instructions + * op3[2]=1 identifies stores + * See "Opcode Maps" in the appendix of any Sparc V9 + * architecture spec for full details. + */ + if ((insn & 0xc0800000) == 0xc0800000) { /* op=3, op3[4]=1 */ + if (insn & 0x2000) /* immediate offset */ + asi = (regs->tstate >> 24); /* saved %asi */ + else + asi = (insn >> 5); /* immediate asi */ + if ((asi & 0xf6) == ASI_PNF) { + if (insn & 0x200000) /* op3[2], stores */ + return false; + if (insn & 0x1000000) /* op3[5:4]=3 (fp) */ + handle_ldf_stq(insn, regs); + else + handle_ld_nf(insn, regs); + return true; + } + } + return false; +} + +void spitfire_data_access_exception(struct pt_regs *regs, unsigned long sfsr, unsigned long sfar) +{ + enum ctx_state prev_state = exception_enter(); + + if (notify_die(DIE_TRAP, "data access exception", regs, + 0, 0x30, SIGTRAP) == NOTIFY_STOP) + goto out; + + if (regs->tstate & TSTATE_PRIV) { + /* Test if this comes from uaccess places. */ + const struct exception_table_entry *entry; + + entry = search_exception_tables(regs->tpc); + if (entry) { + /* Ouch, somebody is trying VM hole tricks on us... */ +#ifdef DEBUG_EXCEPTIONS + printk("Exception: PC<%016lx> faddr<UNKNOWN>\n", regs->tpc); + printk("EX_TABLE: insn<%016lx> fixup<%016lx>\n", + regs->tpc, entry->fixup); +#endif + regs->tpc = entry->fixup; + regs->tnpc = regs->tpc + 4; + goto out; + } + /* Shit... */ + printk("spitfire_data_access_exception: SFSR[%016lx] " + "SFAR[%016lx], going.\n", sfsr, sfar); + die_if_kernel("Dax", regs); + } + + if (is_no_fault_exception(regs)) + return; + + force_sig_fault(SIGSEGV, SEGV_MAPERR, (void __user *)sfar); +out: + exception_exit(prev_state); +} + +void spitfire_data_access_exception_tl1(struct pt_regs *regs, unsigned long sfsr, unsigned long sfar) +{ + if (notify_die(DIE_TRAP_TL1, "data access exception tl1", regs, + 0, 0x30, SIGTRAP) == NOTIFY_STOP) + return; + + dump_tl1_traplog((struct tl1_traplog *)(regs + 1)); + spitfire_data_access_exception(regs, sfsr, sfar); +} + +void sun4v_data_access_exception(struct pt_regs *regs, unsigned long addr, unsigned long type_ctx) +{ + unsigned short type = (type_ctx >> 16); + unsigned short ctx = (type_ctx & 0xffff); + + if (notify_die(DIE_TRAP, "data access exception", regs, + 0, 0x8, SIGTRAP) == NOTIFY_STOP) + return; + + if (regs->tstate & TSTATE_PRIV) { + /* Test if this comes from uaccess places. */ + const struct exception_table_entry *entry; + + entry = search_exception_tables(regs->tpc); + if (entry) { + /* Ouch, somebody is trying VM hole tricks on us... */ +#ifdef DEBUG_EXCEPTIONS + printk("Exception: PC<%016lx> faddr<UNKNOWN>\n", regs->tpc); + printk("EX_TABLE: insn<%016lx> fixup<%016lx>\n", + regs->tpc, entry->fixup); +#endif + regs->tpc = entry->fixup; + regs->tnpc = regs->tpc + 4; + return; + } + printk("sun4v_data_access_exception: ADDR[%016lx] " + "CTX[%04x] TYPE[%04x], going.\n", + addr, ctx, type); + die_if_kernel("Dax", regs); + } + + if (test_thread_flag(TIF_32BIT)) { + regs->tpc &= 0xffffffff; + regs->tnpc &= 0xffffffff; + } + if (is_no_fault_exception(regs)) + return; + + /* MCD (Memory Corruption Detection) disabled trap (TT=0x19) in HV + * is vectored thorugh data access exception trap with fault type + * set to HV_FAULT_TYPE_MCD_DIS. Check for MCD disabled trap. + * Accessing an address with invalid ASI for the address, for + * example setting an ADI tag on an address with ASI_MCD_PRIMARY + * when TTE.mcd is not set for the VA, is also vectored into + * kerbel by HV as data access exception with fault type set to + * HV_FAULT_TYPE_INV_ASI. + */ + switch (type) { + case HV_FAULT_TYPE_INV_ASI: + force_sig_fault(SIGILL, ILL_ILLADR, (void __user *)addr); + break; + case HV_FAULT_TYPE_MCD_DIS: + force_sig_fault(SIGSEGV, SEGV_ACCADI, (void __user *)addr); + break; + default: + force_sig_fault(SIGSEGV, SEGV_MAPERR, (void __user *)addr); + break; + } +} + +void sun4v_data_access_exception_tl1(struct pt_regs *regs, unsigned long addr, unsigned long type_ctx) +{ + if (notify_die(DIE_TRAP_TL1, "data access exception tl1", regs, + 0, 0x8, SIGTRAP) == NOTIFY_STOP) + return; + + dump_tl1_traplog((struct tl1_traplog *)(regs + 1)); + sun4v_data_access_exception(regs, addr, type_ctx); +} + +#ifdef CONFIG_PCI +#include "pci_impl.h" +#endif + +/* When access exceptions happen, we must do this. */ +static void spitfire_clean_and_reenable_l1_caches(void) +{ + unsigned long va; + + if (tlb_type != spitfire) + BUG(); + + /* Clean 'em. */ + for (va = 0; va < (PAGE_SIZE << 1); va += 32) { + spitfire_put_icache_tag(va, 0x0); + spitfire_put_dcache_tag(va, 0x0); + } + + /* Re-enable in LSU. */ + __asm__ __volatile__("flush %%g6\n\t" + "membar #Sync\n\t" + "stxa %0, [%%g0] %1\n\t" + "membar #Sync" + : /* no outputs */ + : "r" (LSU_CONTROL_IC | LSU_CONTROL_DC | + LSU_CONTROL_IM | LSU_CONTROL_DM), + "i" (ASI_LSU_CONTROL) + : "memory"); +} + +static void spitfire_enable_estate_errors(void) +{ + __asm__ __volatile__("stxa %0, [%%g0] %1\n\t" + "membar #Sync" + : /* no outputs */ + : "r" (ESTATE_ERR_ALL), + "i" (ASI_ESTATE_ERROR_EN)); +} + +static char ecc_syndrome_table[] = { + 0x4c, 0x40, 0x41, 0x48, 0x42, 0x48, 0x48, 0x49, + 0x43, 0x48, 0x48, 0x49, 0x48, 0x49, 0x49, 0x4a, + 0x44, 0x48, 0x48, 0x20, 0x48, 0x39, 0x4b, 0x48, + 0x48, 0x25, 0x31, 0x48, 0x28, 0x48, 0x48, 0x2c, + 0x45, 0x48, 0x48, 0x21, 0x48, 0x3d, 0x04, 0x48, + 0x48, 0x4b, 0x35, 0x48, 0x2d, 0x48, 0x48, 0x29, + 0x48, 0x00, 0x01, 0x48, 0x0a, 0x48, 0x48, 0x4b, + 0x0f, 0x48, 0x48, 0x4b, 0x48, 0x49, 0x49, 0x48, + 0x46, 0x48, 0x48, 0x2a, 0x48, 0x3b, 0x27, 0x48, + 0x48, 0x4b, 0x33, 0x48, 0x22, 0x48, 0x48, 0x2e, + 0x48, 0x19, 0x1d, 0x48, 0x1b, 0x4a, 0x48, 0x4b, + 0x1f, 0x48, 0x4a, 0x4b, 0x48, 0x4b, 0x4b, 0x48, + 0x48, 0x4b, 0x24, 0x48, 0x07, 0x48, 0x48, 0x36, + 0x4b, 0x48, 0x48, 0x3e, 0x48, 0x30, 0x38, 0x48, + 0x49, 0x48, 0x48, 0x4b, 0x48, 0x4b, 0x16, 0x48, + 0x48, 0x12, 0x4b, 0x48, 0x49, 0x48, 0x48, 0x4b, + 0x47, 0x48, 0x48, 0x2f, 0x48, 0x3f, 0x4b, 0x48, + 0x48, 0x06, 0x37, 0x48, 0x23, 0x48, 0x48, 0x2b, + 0x48, 0x05, 0x4b, 0x48, 0x4b, 0x48, 0x48, 0x32, + 0x26, 0x48, 0x48, 0x3a, 0x48, 0x34, 0x3c, 0x48, + 0x48, 0x11, 0x15, 0x48, 0x13, 0x4a, 0x48, 0x4b, + 0x17, 0x48, 0x4a, 0x4b, 0x48, 0x4b, 0x4b, 0x48, + 0x49, 0x48, 0x48, 0x4b, 0x48, 0x4b, 0x1e, 0x48, + 0x48, 0x1a, 0x4b, 0x48, 0x49, 0x48, 0x48, 0x4b, + 0x48, 0x08, 0x0d, 0x48, 0x02, 0x48, 0x48, 0x49, + 0x03, 0x48, 0x48, 0x49, 0x48, 0x4b, 0x4b, 0x48, + 0x49, 0x48, 0x48, 0x49, 0x48, 0x4b, 0x10, 0x48, + 0x48, 0x14, 0x4b, 0x48, 0x4b, 0x48, 0x48, 0x4b, + 0x49, 0x48, 0x48, 0x49, 0x48, 0x4b, 0x18, 0x48, + 0x48, 0x1c, 0x4b, 0x48, 0x4b, 0x48, 0x48, 0x4b, + 0x4a, 0x0c, 0x09, 0x48, 0x0e, 0x48, 0x48, 0x4b, + 0x0b, 0x48, 0x48, 0x4b, 0x48, 0x4b, 0x4b, 0x4a +}; + +static char *syndrome_unknown = "<Unknown>"; + +static void spitfire_log_udb_syndrome(unsigned long afar, unsigned long udbh, unsigned long udbl, unsigned long bit) +{ + unsigned short scode; + char memmod_str[64], *p; + + if (udbl & bit) { + scode = ecc_syndrome_table[udbl & 0xff]; + if (sprintf_dimm(scode, afar, memmod_str, sizeof(memmod_str)) < 0) + p = syndrome_unknown; + else + p = memmod_str; + printk(KERN_WARNING "CPU[%d]: UDBL Syndrome[%x] " + "Memory Module \"%s\"\n", + smp_processor_id(), scode, p); + } + + if (udbh & bit) { + scode = ecc_syndrome_table[udbh & 0xff]; + if (sprintf_dimm(scode, afar, memmod_str, sizeof(memmod_str)) < 0) + p = syndrome_unknown; + else + p = memmod_str; + printk(KERN_WARNING "CPU[%d]: UDBH Syndrome[%x] " + "Memory Module \"%s\"\n", + smp_processor_id(), scode, p); + } + +} + +static void spitfire_cee_log(unsigned long afsr, unsigned long afar, unsigned long udbh, unsigned long udbl, int tl1, struct pt_regs *regs) +{ + + printk(KERN_WARNING "CPU[%d]: Correctable ECC Error " + "AFSR[%lx] AFAR[%016lx] UDBL[%lx] UDBH[%lx] TL>1[%d]\n", + smp_processor_id(), afsr, afar, udbl, udbh, tl1); + + spitfire_log_udb_syndrome(afar, udbh, udbl, UDBE_CE); + + /* We always log it, even if someone is listening for this + * trap. + */ + notify_die(DIE_TRAP, "Correctable ECC Error", regs, + 0, TRAP_TYPE_CEE, SIGTRAP); + + /* The Correctable ECC Error trap does not disable I/D caches. So + * we only have to restore the ESTATE Error Enable register. + */ + spitfire_enable_estate_errors(); +} + +static void spitfire_ue_log(unsigned long afsr, unsigned long afar, unsigned long udbh, unsigned long udbl, unsigned long tt, int tl1, struct pt_regs *regs) +{ + printk(KERN_WARNING "CPU[%d]: Uncorrectable Error AFSR[%lx] " + "AFAR[%lx] UDBL[%lx] UDBH[%ld] TT[%lx] TL>1[%d]\n", + smp_processor_id(), afsr, afar, udbl, udbh, tt, tl1); + + /* XXX add more human friendly logging of the error status + * XXX as is implemented for cheetah + */ + + spitfire_log_udb_syndrome(afar, udbh, udbl, UDBE_UE); + + /* We always log it, even if someone is listening for this + * trap. + */ + notify_die(DIE_TRAP, "Uncorrectable Error", regs, + 0, tt, SIGTRAP); + + if (regs->tstate & TSTATE_PRIV) { + if (tl1) + dump_tl1_traplog((struct tl1_traplog *)(regs + 1)); + die_if_kernel("UE", regs); + } + + /* XXX need more intelligent processing here, such as is implemented + * XXX for cheetah errors, in fact if the E-cache still holds the + * XXX line with bad parity this will loop + */ + + spitfire_clean_and_reenable_l1_caches(); + spitfire_enable_estate_errors(); + + if (test_thread_flag(TIF_32BIT)) { + regs->tpc &= 0xffffffff; + regs->tnpc &= 0xffffffff; + } + force_sig_fault(SIGBUS, BUS_OBJERR, (void *)0); +} + +void spitfire_access_error(struct pt_regs *regs, unsigned long status_encoded, unsigned long afar) +{ + unsigned long afsr, tt, udbh, udbl; + int tl1; + + afsr = (status_encoded & SFSTAT_AFSR_MASK) >> SFSTAT_AFSR_SHIFT; + tt = (status_encoded & SFSTAT_TRAP_TYPE) >> SFSTAT_TRAP_TYPE_SHIFT; + tl1 = (status_encoded & SFSTAT_TL_GT_ONE) ? 1 : 0; + udbl = (status_encoded & SFSTAT_UDBL_MASK) >> SFSTAT_UDBL_SHIFT; + udbh = (status_encoded & SFSTAT_UDBH_MASK) >> SFSTAT_UDBH_SHIFT; + +#ifdef CONFIG_PCI + if (tt == TRAP_TYPE_DAE && + pci_poke_in_progress && pci_poke_cpu == smp_processor_id()) { + spitfire_clean_and_reenable_l1_caches(); + spitfire_enable_estate_errors(); + + pci_poke_faulted = 1; + regs->tnpc = regs->tpc + 4; + return; + } +#endif + + if (afsr & SFAFSR_UE) + spitfire_ue_log(afsr, afar, udbh, udbl, tt, tl1, regs); + + if (tt == TRAP_TYPE_CEE) { + /* Handle the case where we took a CEE trap, but ACK'd + * only the UE state in the UDB error registers. + */ + if (afsr & SFAFSR_UE) { + if (udbh & UDBE_CE) { + __asm__ __volatile__( + "stxa %0, [%1] %2\n\t" + "membar #Sync" + : /* no outputs */ + : "r" (udbh & UDBE_CE), + "r" (0x0), "i" (ASI_UDB_ERROR_W)); + } + if (udbl & UDBE_CE) { + __asm__ __volatile__( + "stxa %0, [%1] %2\n\t" + "membar #Sync" + : /* no outputs */ + : "r" (udbl & UDBE_CE), + "r" (0x18), "i" (ASI_UDB_ERROR_W)); + } + } + + spitfire_cee_log(afsr, afar, udbh, udbl, tl1, regs); + } +} + +int cheetah_pcache_forced_on; + +void cheetah_enable_pcache(void) +{ + unsigned long dcr; + + printk("CHEETAH: Enabling P-Cache on cpu %d.\n", + smp_processor_id()); + + __asm__ __volatile__("ldxa [%%g0] %1, %0" + : "=r" (dcr) + : "i" (ASI_DCU_CONTROL_REG)); + dcr |= (DCU_PE | DCU_HPE | DCU_SPE | DCU_SL); + __asm__ __volatile__("stxa %0, [%%g0] %1\n\t" + "membar #Sync" + : /* no outputs */ + : "r" (dcr), "i" (ASI_DCU_CONTROL_REG)); +} + +/* Cheetah error trap handling. */ +static unsigned long ecache_flush_physbase; +static unsigned long ecache_flush_linesize; +static unsigned long ecache_flush_size; + +/* This table is ordered in priority of errors and matches the + * AFAR overwrite policy as well. + */ + +struct afsr_error_table { + unsigned long mask; + const char *name; +}; + +static const char CHAFSR_PERR_msg[] = + "System interface protocol error"; +static const char CHAFSR_IERR_msg[] = + "Internal processor error"; +static const char CHAFSR_ISAP_msg[] = + "System request parity error on incoming address"; +static const char CHAFSR_UCU_msg[] = + "Uncorrectable E-cache ECC error for ifetch/data"; +static const char CHAFSR_UCC_msg[] = + "SW Correctable E-cache ECC error for ifetch/data"; +static const char CHAFSR_UE_msg[] = + "Uncorrectable system bus data ECC error for read"; +static const char CHAFSR_EDU_msg[] = + "Uncorrectable E-cache ECC error for stmerge/blkld"; +static const char CHAFSR_EMU_msg[] = + "Uncorrectable system bus MTAG error"; +static const char CHAFSR_WDU_msg[] = + "Uncorrectable E-cache ECC error for writeback"; +static const char CHAFSR_CPU_msg[] = + "Uncorrectable ECC error for copyout"; +static const char CHAFSR_CE_msg[] = + "HW corrected system bus data ECC error for read"; +static const char CHAFSR_EDC_msg[] = + "HW corrected E-cache ECC error for stmerge/blkld"; +static const char CHAFSR_EMC_msg[] = + "HW corrected system bus MTAG ECC error"; +static const char CHAFSR_WDC_msg[] = + "HW corrected E-cache ECC error for writeback"; +static const char CHAFSR_CPC_msg[] = + "HW corrected ECC error for copyout"; +static const char CHAFSR_TO_msg[] = + "Unmapped error from system bus"; +static const char CHAFSR_BERR_msg[] = + "Bus error response from system bus"; +static const char CHAFSR_IVC_msg[] = + "HW corrected system bus data ECC error for ivec read"; +static const char CHAFSR_IVU_msg[] = + "Uncorrectable system bus data ECC error for ivec read"; +static struct afsr_error_table __cheetah_error_table[] = { + { CHAFSR_PERR, CHAFSR_PERR_msg }, + { CHAFSR_IERR, CHAFSR_IERR_msg }, + { CHAFSR_ISAP, CHAFSR_ISAP_msg }, + { CHAFSR_UCU, CHAFSR_UCU_msg }, + { CHAFSR_UCC, CHAFSR_UCC_msg }, + { CHAFSR_UE, CHAFSR_UE_msg }, + { CHAFSR_EDU, CHAFSR_EDU_msg }, + { CHAFSR_EMU, CHAFSR_EMU_msg }, + { CHAFSR_WDU, CHAFSR_WDU_msg }, + { CHAFSR_CPU, CHAFSR_CPU_msg }, + { CHAFSR_CE, CHAFSR_CE_msg }, + { CHAFSR_EDC, CHAFSR_EDC_msg }, + { CHAFSR_EMC, CHAFSR_EMC_msg }, + { CHAFSR_WDC, CHAFSR_WDC_msg }, + { CHAFSR_CPC, CHAFSR_CPC_msg }, + { CHAFSR_TO, CHAFSR_TO_msg }, + { CHAFSR_BERR, CHAFSR_BERR_msg }, + /* These two do not update the AFAR. */ + { CHAFSR_IVC, CHAFSR_IVC_msg }, + { CHAFSR_IVU, CHAFSR_IVU_msg }, + { 0, NULL }, +}; +static const char CHPAFSR_DTO_msg[] = + "System bus unmapped error for prefetch/storequeue-read"; +static const char CHPAFSR_DBERR_msg[] = + "System bus error for prefetch/storequeue-read"; +static const char CHPAFSR_THCE_msg[] = + "Hardware corrected E-cache Tag ECC error"; +static const char CHPAFSR_TSCE_msg[] = + "SW handled correctable E-cache Tag ECC error"; +static const char CHPAFSR_TUE_msg[] = + "Uncorrectable E-cache Tag ECC error"; +static const char CHPAFSR_DUE_msg[] = + "System bus uncorrectable data ECC error due to prefetch/store-fill"; +static struct afsr_error_table __cheetah_plus_error_table[] = { + { CHAFSR_PERR, CHAFSR_PERR_msg }, + { CHAFSR_IERR, CHAFSR_IERR_msg }, + { CHAFSR_ISAP, CHAFSR_ISAP_msg }, + { CHAFSR_UCU, CHAFSR_UCU_msg }, + { CHAFSR_UCC, CHAFSR_UCC_msg }, + { CHAFSR_UE, CHAFSR_UE_msg }, + { CHAFSR_EDU, CHAFSR_EDU_msg }, + { CHAFSR_EMU, CHAFSR_EMU_msg }, + { CHAFSR_WDU, CHAFSR_WDU_msg }, + { CHAFSR_CPU, CHAFSR_CPU_msg }, + { CHAFSR_CE, CHAFSR_CE_msg }, + { CHAFSR_EDC, CHAFSR_EDC_msg }, + { CHAFSR_EMC, CHAFSR_EMC_msg }, + { CHAFSR_WDC, CHAFSR_WDC_msg }, + { CHAFSR_CPC, CHAFSR_CPC_msg }, + { CHAFSR_TO, CHAFSR_TO_msg }, + { CHAFSR_BERR, CHAFSR_BERR_msg }, + { CHPAFSR_DTO, CHPAFSR_DTO_msg }, + { CHPAFSR_DBERR, CHPAFSR_DBERR_msg }, + { CHPAFSR_THCE, CHPAFSR_THCE_msg }, + { CHPAFSR_TSCE, CHPAFSR_TSCE_msg }, + { CHPAFSR_TUE, CHPAFSR_TUE_msg }, + { CHPAFSR_DUE, CHPAFSR_DUE_msg }, + /* These two do not update the AFAR. */ + { CHAFSR_IVC, CHAFSR_IVC_msg }, + { CHAFSR_IVU, CHAFSR_IVU_msg }, + { 0, NULL }, +}; +static const char JPAFSR_JETO_msg[] = + "System interface protocol error, hw timeout caused"; +static const char JPAFSR_SCE_msg[] = + "Parity error on system snoop results"; +static const char JPAFSR_JEIC_msg[] = + "System interface protocol error, illegal command detected"; +static const char JPAFSR_JEIT_msg[] = + "System interface protocol error, illegal ADTYPE detected"; +static const char JPAFSR_OM_msg[] = + "Out of range memory error has occurred"; +static const char JPAFSR_ETP_msg[] = + "Parity error on L2 cache tag SRAM"; +static const char JPAFSR_UMS_msg[] = + "Error due to unsupported store"; +static const char JPAFSR_RUE_msg[] = + "Uncorrectable ECC error from remote cache/memory"; +static const char JPAFSR_RCE_msg[] = + "Correctable ECC error from remote cache/memory"; +static const char JPAFSR_BP_msg[] = + "JBUS parity error on returned read data"; +static const char JPAFSR_WBP_msg[] = + "JBUS parity error on data for writeback or block store"; +static const char JPAFSR_FRC_msg[] = + "Foreign read to DRAM incurring correctable ECC error"; +static const char JPAFSR_FRU_msg[] = + "Foreign read to DRAM incurring uncorrectable ECC error"; +static struct afsr_error_table __jalapeno_error_table[] = { + { JPAFSR_JETO, JPAFSR_JETO_msg }, + { JPAFSR_SCE, JPAFSR_SCE_msg }, + { JPAFSR_JEIC, JPAFSR_JEIC_msg }, + { JPAFSR_JEIT, JPAFSR_JEIT_msg }, + { CHAFSR_PERR, CHAFSR_PERR_msg }, + { CHAFSR_IERR, CHAFSR_IERR_msg }, + { CHAFSR_ISAP, CHAFSR_ISAP_msg }, + { CHAFSR_UCU, CHAFSR_UCU_msg }, + { CHAFSR_UCC, CHAFSR_UCC_msg }, + { CHAFSR_UE, CHAFSR_UE_msg }, + { CHAFSR_EDU, CHAFSR_EDU_msg }, + { JPAFSR_OM, JPAFSR_OM_msg }, + { CHAFSR_WDU, CHAFSR_WDU_msg }, + { CHAFSR_CPU, CHAFSR_CPU_msg }, + { CHAFSR_CE, CHAFSR_CE_msg }, + { CHAFSR_EDC, CHAFSR_EDC_msg }, + { JPAFSR_ETP, JPAFSR_ETP_msg }, + { CHAFSR_WDC, CHAFSR_WDC_msg }, + { CHAFSR_CPC, CHAFSR_CPC_msg }, + { CHAFSR_TO, CHAFSR_TO_msg }, + { CHAFSR_BERR, CHAFSR_BERR_msg }, + { JPAFSR_UMS, JPAFSR_UMS_msg }, + { JPAFSR_RUE, JPAFSR_RUE_msg }, + { JPAFSR_RCE, JPAFSR_RCE_msg }, + { JPAFSR_BP, JPAFSR_BP_msg }, + { JPAFSR_WBP, JPAFSR_WBP_msg }, + { JPAFSR_FRC, JPAFSR_FRC_msg }, + { JPAFSR_FRU, JPAFSR_FRU_msg }, + /* These two do not update the AFAR. */ + { CHAFSR_IVU, CHAFSR_IVU_msg }, + { 0, NULL }, +}; +static struct afsr_error_table *cheetah_error_table; +static unsigned long cheetah_afsr_errors; + +struct cheetah_err_info *cheetah_error_log; + +static inline struct cheetah_err_info *cheetah_get_error_log(unsigned long afsr) +{ + struct cheetah_err_info *p; + int cpu = smp_processor_id(); + + if (!cheetah_error_log) + return NULL; + + p = cheetah_error_log + (cpu * 2); + if ((afsr & CHAFSR_TL1) != 0UL) + p++; + + return p; +} + +extern unsigned int tl0_icpe[], tl1_icpe[]; +extern unsigned int tl0_dcpe[], tl1_dcpe[]; +extern unsigned int tl0_fecc[], tl1_fecc[]; +extern unsigned int tl0_cee[], tl1_cee[]; +extern unsigned int tl0_iae[], tl1_iae[]; +extern unsigned int tl0_dae[], tl1_dae[]; +extern unsigned int cheetah_plus_icpe_trap_vector[], cheetah_plus_icpe_trap_vector_tl1[]; +extern unsigned int cheetah_plus_dcpe_trap_vector[], cheetah_plus_dcpe_trap_vector_tl1[]; +extern unsigned int cheetah_fecc_trap_vector[], cheetah_fecc_trap_vector_tl1[]; +extern unsigned int cheetah_cee_trap_vector[], cheetah_cee_trap_vector_tl1[]; +extern unsigned int cheetah_deferred_trap_vector[], cheetah_deferred_trap_vector_tl1[]; + +void __init cheetah_ecache_flush_init(void) +{ + unsigned long largest_size, smallest_linesize, order, ver; + int i, sz; + + /* Scan all cpu device tree nodes, note two values: + * 1) largest E-cache size + * 2) smallest E-cache line size + */ + largest_size = 0UL; + smallest_linesize = ~0UL; + + for (i = 0; i < NR_CPUS; i++) { + unsigned long val; + + val = cpu_data(i).ecache_size; + if (!val) + continue; + + if (val > largest_size) + largest_size = val; + + val = cpu_data(i).ecache_line_size; + if (val < smallest_linesize) + smallest_linesize = val; + + } + + if (largest_size == 0UL || smallest_linesize == ~0UL) { + prom_printf("cheetah_ecache_flush_init: Cannot probe cpu E-cache " + "parameters.\n"); + prom_halt(); + } + + ecache_flush_size = (2 * largest_size); + ecache_flush_linesize = smallest_linesize; + + ecache_flush_physbase = find_ecache_flush_span(ecache_flush_size); + + if (ecache_flush_physbase == ~0UL) { + prom_printf("cheetah_ecache_flush_init: Cannot find %ld byte " + "contiguous physical memory.\n", + ecache_flush_size); + prom_halt(); + } + + /* Now allocate error trap reporting scoreboard. */ + sz = NR_CPUS * (2 * sizeof(struct cheetah_err_info)); + for (order = 0; order <= MAX_ORDER; order++) { + if ((PAGE_SIZE << order) >= sz) + break; + } + cheetah_error_log = (struct cheetah_err_info *) + __get_free_pages(GFP_KERNEL, order); + if (!cheetah_error_log) { + prom_printf("cheetah_ecache_flush_init: Failed to allocate " + "error logging scoreboard (%d bytes).\n", sz); + prom_halt(); + } + memset(cheetah_error_log, 0, PAGE_SIZE << order); + + /* Mark all AFSRs as invalid so that the trap handler will + * log new new information there. + */ + for (i = 0; i < 2 * NR_CPUS; i++) + cheetah_error_log[i].afsr = CHAFSR_INVALID; + + __asm__ ("rdpr %%ver, %0" : "=r" (ver)); + if ((ver >> 32) == __JALAPENO_ID || + (ver >> 32) == __SERRANO_ID) { + cheetah_error_table = &__jalapeno_error_table[0]; + cheetah_afsr_errors = JPAFSR_ERRORS; + } else if ((ver >> 32) == 0x003e0015) { + cheetah_error_table = &__cheetah_plus_error_table[0]; + cheetah_afsr_errors = CHPAFSR_ERRORS; + } else { + cheetah_error_table = &__cheetah_error_table[0]; + cheetah_afsr_errors = CHAFSR_ERRORS; + } + + /* Now patch trap tables. */ + memcpy(tl0_fecc, cheetah_fecc_trap_vector, (8 * 4)); + memcpy(tl1_fecc, cheetah_fecc_trap_vector_tl1, (8 * 4)); + memcpy(tl0_cee, cheetah_cee_trap_vector, (8 * 4)); + memcpy(tl1_cee, cheetah_cee_trap_vector_tl1, (8 * 4)); + memcpy(tl0_iae, cheetah_deferred_trap_vector, (8 * 4)); + memcpy(tl1_iae, cheetah_deferred_trap_vector_tl1, (8 * 4)); + memcpy(tl0_dae, cheetah_deferred_trap_vector, (8 * 4)); + memcpy(tl1_dae, cheetah_deferred_trap_vector_tl1, (8 * 4)); + if (tlb_type == cheetah_plus) { + memcpy(tl0_dcpe, cheetah_plus_dcpe_trap_vector, (8 * 4)); + memcpy(tl1_dcpe, cheetah_plus_dcpe_trap_vector_tl1, (8 * 4)); + memcpy(tl0_icpe, cheetah_plus_icpe_trap_vector, (8 * 4)); + memcpy(tl1_icpe, cheetah_plus_icpe_trap_vector_tl1, (8 * 4)); + } + flushi(PAGE_OFFSET); +} + +static void cheetah_flush_ecache(void) +{ + unsigned long flush_base = ecache_flush_physbase; + unsigned long flush_linesize = ecache_flush_linesize; + unsigned long flush_size = ecache_flush_size; + + __asm__ __volatile__("1: subcc %0, %4, %0\n\t" + " bne,pt %%xcc, 1b\n\t" + " ldxa [%2 + %0] %3, %%g0\n\t" + : "=&r" (flush_size) + : "0" (flush_size), "r" (flush_base), + "i" (ASI_PHYS_USE_EC), "r" (flush_linesize)); +} + +static void cheetah_flush_ecache_line(unsigned long physaddr) +{ + unsigned long alias; + + physaddr &= ~(8UL - 1UL); + physaddr = (ecache_flush_physbase + + (physaddr & ((ecache_flush_size>>1UL) - 1UL))); + alias = physaddr + (ecache_flush_size >> 1UL); + __asm__ __volatile__("ldxa [%0] %2, %%g0\n\t" + "ldxa [%1] %2, %%g0\n\t" + "membar #Sync" + : /* no outputs */ + : "r" (physaddr), "r" (alias), + "i" (ASI_PHYS_USE_EC)); +} + +/* Unfortunately, the diagnostic access to the I-cache tags we need to + * use to clear the thing interferes with I-cache coherency transactions. + * + * So we must only flush the I-cache when it is disabled. + */ +static void __cheetah_flush_icache(void) +{ + unsigned int icache_size, icache_line_size; + unsigned long addr; + + icache_size = local_cpu_data().icache_size; + icache_line_size = local_cpu_data().icache_line_size; + + /* Clear the valid bits in all the tags. */ + for (addr = 0; addr < icache_size; addr += icache_line_size) { + __asm__ __volatile__("stxa %%g0, [%0] %1\n\t" + "membar #Sync" + : /* no outputs */ + : "r" (addr | (2 << 3)), + "i" (ASI_IC_TAG)); + } +} + +static void cheetah_flush_icache(void) +{ + unsigned long dcu_save; + + /* Save current DCU, disable I-cache. */ + __asm__ __volatile__("ldxa [%%g0] %1, %0\n\t" + "or %0, %2, %%g1\n\t" + "stxa %%g1, [%%g0] %1\n\t" + "membar #Sync" + : "=r" (dcu_save) + : "i" (ASI_DCU_CONTROL_REG), "i" (DCU_IC) + : "g1"); + + __cheetah_flush_icache(); + + /* Restore DCU register */ + __asm__ __volatile__("stxa %0, [%%g0] %1\n\t" + "membar #Sync" + : /* no outputs */ + : "r" (dcu_save), "i" (ASI_DCU_CONTROL_REG)); +} + +static void cheetah_flush_dcache(void) +{ + unsigned int dcache_size, dcache_line_size; + unsigned long addr; + + dcache_size = local_cpu_data().dcache_size; + dcache_line_size = local_cpu_data().dcache_line_size; + + for (addr = 0; addr < dcache_size; addr += dcache_line_size) { + __asm__ __volatile__("stxa %%g0, [%0] %1\n\t" + "membar #Sync" + : /* no outputs */ + : "r" (addr), "i" (ASI_DCACHE_TAG)); + } +} + +/* In order to make the even parity correct we must do two things. + * First, we clear DC_data_parity and set DC_utag to an appropriate value. + * Next, we clear out all 32-bytes of data for that line. Data of + * all-zero + tag parity value of zero == correct parity. + */ +static void cheetah_plus_zap_dcache_parity(void) +{ + unsigned int dcache_size, dcache_line_size; + unsigned long addr; + + dcache_size = local_cpu_data().dcache_size; + dcache_line_size = local_cpu_data().dcache_line_size; + + for (addr = 0; addr < dcache_size; addr += dcache_line_size) { + unsigned long tag = (addr >> 14); + unsigned long line; + + __asm__ __volatile__("membar #Sync\n\t" + "stxa %0, [%1] %2\n\t" + "membar #Sync" + : /* no outputs */ + : "r" (tag), "r" (addr), + "i" (ASI_DCACHE_UTAG)); + for (line = addr; line < addr + dcache_line_size; line += 8) + __asm__ __volatile__("membar #Sync\n\t" + "stxa %%g0, [%0] %1\n\t" + "membar #Sync" + : /* no outputs */ + : "r" (line), + "i" (ASI_DCACHE_DATA)); + } +} + +/* Conversion tables used to frob Cheetah AFSR syndrome values into + * something palatable to the memory controller driver get_unumber + * routine. + */ +#define MT0 137 +#define MT1 138 +#define MT2 139 +#define NONE 254 +#define MTC0 140 +#define MTC1 141 +#define MTC2 142 +#define MTC3 143 +#define C0 128 +#define C1 129 +#define C2 130 +#define C3 131 +#define C4 132 +#define C5 133 +#define C6 134 +#define C7 135 +#define C8 136 +#define M2 144 +#define M3 145 +#define M4 146 +#define M 147 +static unsigned char cheetah_ecc_syntab[] = { +/*00*/NONE, C0, C1, M2, C2, M2, M3, 47, C3, M2, M2, 53, M2, 41, 29, M, +/*01*/C4, M, M, 50, M2, 38, 25, M2, M2, 33, 24, M2, 11, M, M2, 16, +/*02*/C5, M, M, 46, M2, 37, 19, M2, M, 31, 32, M, 7, M2, M2, 10, +/*03*/M2, 40, 13, M2, 59, M, M2, 66, M, M2, M2, 0, M2, 67, 71, M, +/*04*/C6, M, M, 43, M, 36, 18, M, M2, 49, 15, M, 63, M2, M2, 6, +/*05*/M2, 44, 28, M2, M, M2, M2, 52, 68, M2, M2, 62, M2, M3, M3, M4, +/*06*/M2, 26, 106, M2, 64, M, M2, 2, 120, M, M2, M3, M, M3, M3, M4, +/*07*/116, M2, M2, M3, M2, M3, M, M4, M2, 58, 54, M2, M, M4, M4, M3, +/*08*/C7, M2, M, 42, M, 35, 17, M2, M, 45, 14, M2, 21, M2, M2, 5, +/*09*/M, 27, M, M, 99, M, M, 3, 114, M2, M2, 20, M2, M3, M3, M, +/*0a*/M2, 23, 113, M2, 112, M2, M, 51, 95, M, M2, M3, M2, M3, M3, M2, +/*0b*/103, M, M2, M3, M2, M3, M3, M4, M2, 48, M, M, 73, M2, M, M3, +/*0c*/M2, 22, 110, M2, 109, M2, M, 9, 108, M2, M, M3, M2, M3, M3, M, +/*0d*/102, M2, M, M, M2, M3, M3, M, M2, M3, M3, M2, M, M4, M, M3, +/*0e*/98, M, M2, M3, M2, M, M3, M4, M2, M3, M3, M4, M3, M, M, M, +/*0f*/M2, M3, M3, M, M3, M, M, M, 56, M4, M, M3, M4, M, M, M, +/*10*/C8, M, M2, 39, M, 34, 105, M2, M, 30, 104, M, 101, M, M, 4, +/*11*/M, M, 100, M, 83, M, M2, 12, 87, M, M, 57, M2, M, M3, M, +/*12*/M2, 97, 82, M2, 78, M2, M2, 1, 96, M, M, M, M, M, M3, M2, +/*13*/94, M, M2, M3, M2, M, M3, M, M2, M, 79, M, 69, M, M4, M, +/*14*/M2, 93, 92, M, 91, M, M2, 8, 90, M2, M2, M, M, M, M, M4, +/*15*/89, M, M, M3, M2, M3, M3, M, M, M, M3, M2, M3, M2, M, M3, +/*16*/86, M, M2, M3, M2, M, M3, M, M2, M, M3, M, M3, M, M, M3, +/*17*/M, M, M3, M2, M3, M2, M4, M, 60, M, M2, M3, M4, M, M, M2, +/*18*/M2, 88, 85, M2, 84, M, M2, 55, 81, M2, M2, M3, M2, M3, M3, M4, +/*19*/77, M, M, M, M2, M3, M, M, M2, M3, M3, M4, M3, M2, M, M, +/*1a*/74, M, M2, M3, M, M, M3, M, M, M, M3, M, M3, M, M4, M3, +/*1b*/M2, 70, 107, M4, 65, M2, M2, M, 127, M, M, M, M2, M3, M3, M, +/*1c*/80, M2, M2, 72, M, 119, 118, M, M2, 126, 76, M, 125, M, M4, M3, +/*1d*/M2, 115, 124, M, 75, M, M, M3, 61, M, M4, M, M4, M, M, M, +/*1e*/M, 123, 122, M4, 121, M4, M, M3, 117, M2, M2, M3, M4, M3, M, M, +/*1f*/111, M, M, M, M4, M3, M3, M, M, M, M3, M, M3, M2, M, M +}; +static unsigned char cheetah_mtag_syntab[] = { + NONE, MTC0, + MTC1, NONE, + MTC2, NONE, + NONE, MT0, + MTC3, NONE, + NONE, MT1, + NONE, MT2, + NONE, NONE +}; + +/* Return the highest priority error conditon mentioned. */ +static inline unsigned long cheetah_get_hipri(unsigned long afsr) +{ + unsigned long tmp = 0; + int i; + + for (i = 0; cheetah_error_table[i].mask; i++) { + if ((tmp = (afsr & cheetah_error_table[i].mask)) != 0UL) + return tmp; + } + return tmp; +} + +static const char *cheetah_get_string(unsigned long bit) +{ + int i; + + for (i = 0; cheetah_error_table[i].mask; i++) { + if ((bit & cheetah_error_table[i].mask) != 0UL) + return cheetah_error_table[i].name; + } + return "???"; +} + +static void cheetah_log_errors(struct pt_regs *regs, struct cheetah_err_info *info, + unsigned long afsr, unsigned long afar, int recoverable) +{ + unsigned long hipri; + char unum[256]; + + printk("%s" "ERROR(%d): Cheetah error trap taken afsr[%016lx] afar[%016lx] TL1(%d)\n", + (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(), + afsr, afar, + (afsr & CHAFSR_TL1) ? 1 : 0); + printk("%s" "ERROR(%d): TPC[%lx] TNPC[%lx] O7[%lx] TSTATE[%lx]\n", + (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(), + regs->tpc, regs->tnpc, regs->u_regs[UREG_I7], regs->tstate); + printk("%s" "ERROR(%d): ", + (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id()); + printk("TPC<%pS>\n", (void *) regs->tpc); + printk("%s" "ERROR(%d): M_SYND(%lx), E_SYND(%lx)%s%s\n", + (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(), + (afsr & CHAFSR_M_SYNDROME) >> CHAFSR_M_SYNDROME_SHIFT, + (afsr & CHAFSR_E_SYNDROME) >> CHAFSR_E_SYNDROME_SHIFT, + (afsr & CHAFSR_ME) ? ", Multiple Errors" : "", + (afsr & CHAFSR_PRIV) ? ", Privileged" : ""); + hipri = cheetah_get_hipri(afsr); + printk("%s" "ERROR(%d): Highest priority error (%016lx) \"%s\"\n", + (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(), + hipri, cheetah_get_string(hipri)); + + /* Try to get unumber if relevant. */ +#define ESYND_ERRORS (CHAFSR_IVC | CHAFSR_IVU | \ + CHAFSR_CPC | CHAFSR_CPU | \ + CHAFSR_UE | CHAFSR_CE | \ + CHAFSR_EDC | CHAFSR_EDU | \ + CHAFSR_UCC | CHAFSR_UCU | \ + CHAFSR_WDU | CHAFSR_WDC) +#define MSYND_ERRORS (CHAFSR_EMC | CHAFSR_EMU) + if (afsr & ESYND_ERRORS) { + int syndrome; + int ret; + + syndrome = (afsr & CHAFSR_E_SYNDROME) >> CHAFSR_E_SYNDROME_SHIFT; + syndrome = cheetah_ecc_syntab[syndrome]; + ret = sprintf_dimm(syndrome, afar, unum, sizeof(unum)); + if (ret != -1) + printk("%s" "ERROR(%d): AFAR E-syndrome [%s]\n", + (recoverable ? KERN_WARNING : KERN_CRIT), + smp_processor_id(), unum); + } else if (afsr & MSYND_ERRORS) { + int syndrome; + int ret; + + syndrome = (afsr & CHAFSR_M_SYNDROME) >> CHAFSR_M_SYNDROME_SHIFT; + syndrome = cheetah_mtag_syntab[syndrome]; + ret = sprintf_dimm(syndrome, afar, unum, sizeof(unum)); + if (ret != -1) + printk("%s" "ERROR(%d): AFAR M-syndrome [%s]\n", + (recoverable ? KERN_WARNING : KERN_CRIT), + smp_processor_id(), unum); + } + + /* Now dump the cache snapshots. */ + printk("%s" "ERROR(%d): D-cache idx[%x] tag[%016llx] utag[%016llx] stag[%016llx]\n", + (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(), + (int) info->dcache_index, + info->dcache_tag, + info->dcache_utag, + info->dcache_stag); + printk("%s" "ERROR(%d): D-cache data0[%016llx] data1[%016llx] data2[%016llx] data3[%016llx]\n", + (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(), + info->dcache_data[0], + info->dcache_data[1], + info->dcache_data[2], + info->dcache_data[3]); + printk("%s" "ERROR(%d): I-cache idx[%x] tag[%016llx] utag[%016llx] stag[%016llx] " + "u[%016llx] l[%016llx]\n", + (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(), + (int) info->icache_index, + info->icache_tag, + info->icache_utag, + info->icache_stag, + info->icache_upper, + info->icache_lower); + printk("%s" "ERROR(%d): I-cache INSN0[%016llx] INSN1[%016llx] INSN2[%016llx] INSN3[%016llx]\n", + (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(), + info->icache_data[0], + info->icache_data[1], + info->icache_data[2], + info->icache_data[3]); + printk("%s" "ERROR(%d): I-cache INSN4[%016llx] INSN5[%016llx] INSN6[%016llx] INSN7[%016llx]\n", + (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(), + info->icache_data[4], + info->icache_data[5], + info->icache_data[6], + info->icache_data[7]); + printk("%s" "ERROR(%d): E-cache idx[%x] tag[%016llx]\n", + (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(), + (int) info->ecache_index, info->ecache_tag); + printk("%s" "ERROR(%d): E-cache data0[%016llx] data1[%016llx] data2[%016llx] data3[%016llx]\n", + (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(), + info->ecache_data[0], + info->ecache_data[1], + info->ecache_data[2], + info->ecache_data[3]); + + afsr = (afsr & ~hipri) & cheetah_afsr_errors; + while (afsr != 0UL) { + unsigned long bit = cheetah_get_hipri(afsr); + + printk("%s" "ERROR: Multiple-error (%016lx) \"%s\"\n", + (recoverable ? KERN_WARNING : KERN_CRIT), + bit, cheetah_get_string(bit)); + + afsr &= ~bit; + } + + if (!recoverable) + printk(KERN_CRIT "ERROR: This condition is not recoverable.\n"); +} + +static int cheetah_recheck_errors(struct cheetah_err_info *logp) +{ + unsigned long afsr, afar; + int ret = 0; + + __asm__ __volatile__("ldxa [%%g0] %1, %0\n\t" + : "=r" (afsr) + : "i" (ASI_AFSR)); + if ((afsr & cheetah_afsr_errors) != 0) { + if (logp != NULL) { + __asm__ __volatile__("ldxa [%%g0] %1, %0\n\t" + : "=r" (afar) + : "i" (ASI_AFAR)); + logp->afsr = afsr; + logp->afar = afar; + } + ret = 1; + } + __asm__ __volatile__("stxa %0, [%%g0] %1\n\t" + "membar #Sync\n\t" + : : "r" (afsr), "i" (ASI_AFSR)); + + return ret; +} + +void cheetah_fecc_handler(struct pt_regs *regs, unsigned long afsr, unsigned long afar) +{ + struct cheetah_err_info local_snapshot, *p; + int recoverable; + + /* Flush E-cache */ + cheetah_flush_ecache(); + + p = cheetah_get_error_log(afsr); + if (!p) { + prom_printf("ERROR: Early Fast-ECC error afsr[%016lx] afar[%016lx]\n", + afsr, afar); + prom_printf("ERROR: CPU(%d) TPC[%016lx] TNPC[%016lx] TSTATE[%016lx]\n", + smp_processor_id(), regs->tpc, regs->tnpc, regs->tstate); + prom_halt(); + } + + /* Grab snapshot of logged error. */ + memcpy(&local_snapshot, p, sizeof(local_snapshot)); + + /* If the current trap snapshot does not match what the + * trap handler passed along into our args, big trouble. + * In such a case, mark the local copy as invalid. + * + * Else, it matches and we mark the afsr in the non-local + * copy as invalid so we may log new error traps there. + */ + if (p->afsr != afsr || p->afar != afar) + local_snapshot.afsr = CHAFSR_INVALID; + else + p->afsr = CHAFSR_INVALID; + + cheetah_flush_icache(); + cheetah_flush_dcache(); + + /* Re-enable I-cache/D-cache */ + __asm__ __volatile__("ldxa [%%g0] %0, %%g1\n\t" + "or %%g1, %1, %%g1\n\t" + "stxa %%g1, [%%g0] %0\n\t" + "membar #Sync" + : /* no outputs */ + : "i" (ASI_DCU_CONTROL_REG), + "i" (DCU_DC | DCU_IC) + : "g1"); + + /* Re-enable error reporting */ + __asm__ __volatile__("ldxa [%%g0] %0, %%g1\n\t" + "or %%g1, %1, %%g1\n\t" + "stxa %%g1, [%%g0] %0\n\t" + "membar #Sync" + : /* no outputs */ + : "i" (ASI_ESTATE_ERROR_EN), + "i" (ESTATE_ERROR_NCEEN | ESTATE_ERROR_CEEN) + : "g1"); + + /* Decide if we can continue after handling this trap and + * logging the error. + */ + recoverable = 1; + if (afsr & (CHAFSR_PERR | CHAFSR_IERR | CHAFSR_ISAP)) + recoverable = 0; + + /* Re-check AFSR/AFAR. What we are looking for here is whether a new + * error was logged while we had error reporting traps disabled. + */ + if (cheetah_recheck_errors(&local_snapshot)) { + unsigned long new_afsr = local_snapshot.afsr; + + /* If we got a new asynchronous error, die... */ + if (new_afsr & (CHAFSR_EMU | CHAFSR_EDU | + CHAFSR_WDU | CHAFSR_CPU | + CHAFSR_IVU | CHAFSR_UE | + CHAFSR_BERR | CHAFSR_TO)) + recoverable = 0; + } + + /* Log errors. */ + cheetah_log_errors(regs, &local_snapshot, afsr, afar, recoverable); + + if (!recoverable) + panic("Irrecoverable Fast-ECC error trap.\n"); + + /* Flush E-cache to kick the error trap handlers out. */ + cheetah_flush_ecache(); +} + +/* Try to fix a correctable error by pushing the line out from + * the E-cache. Recheck error reporting registers to see if the + * problem is intermittent. + */ +static int cheetah_fix_ce(unsigned long physaddr) +{ + unsigned long orig_estate; + unsigned long alias1, alias2; + int ret; + + /* Make sure correctable error traps are disabled. */ + __asm__ __volatile__("ldxa [%%g0] %2, %0\n\t" + "andn %0, %1, %%g1\n\t" + "stxa %%g1, [%%g0] %2\n\t" + "membar #Sync" + : "=&r" (orig_estate) + : "i" (ESTATE_ERROR_CEEN), + "i" (ASI_ESTATE_ERROR_EN) + : "g1"); + + /* We calculate alias addresses that will force the + * cache line in question out of the E-cache. Then + * we bring it back in with an atomic instruction so + * that we get it in some modified/exclusive state, + * then we displace it again to try and get proper ECC + * pushed back into the system. + */ + physaddr &= ~(8UL - 1UL); + alias1 = (ecache_flush_physbase + + (physaddr & ((ecache_flush_size >> 1) - 1))); + alias2 = alias1 + (ecache_flush_size >> 1); + __asm__ __volatile__("ldxa [%0] %3, %%g0\n\t" + "ldxa [%1] %3, %%g0\n\t" + "casxa [%2] %3, %%g0, %%g0\n\t" + "ldxa [%0] %3, %%g0\n\t" + "ldxa [%1] %3, %%g0\n\t" + "membar #Sync" + : /* no outputs */ + : "r" (alias1), "r" (alias2), + "r" (physaddr), "i" (ASI_PHYS_USE_EC)); + + /* Did that trigger another error? */ + if (cheetah_recheck_errors(NULL)) { + /* Try one more time. */ + __asm__ __volatile__("ldxa [%0] %1, %%g0\n\t" + "membar #Sync" + : : "r" (physaddr), "i" (ASI_PHYS_USE_EC)); + if (cheetah_recheck_errors(NULL)) + ret = 2; + else + ret = 1; + } else { + /* No new error, intermittent problem. */ + ret = 0; + } + + /* Restore error enables. */ + __asm__ __volatile__("stxa %0, [%%g0] %1\n\t" + "membar #Sync" + : : "r" (orig_estate), "i" (ASI_ESTATE_ERROR_EN)); + + return ret; +} + +/* Return non-zero if PADDR is a valid physical memory address. */ +static int cheetah_check_main_memory(unsigned long paddr) +{ + unsigned long vaddr = PAGE_OFFSET + paddr; + + if (vaddr > (unsigned long) high_memory) + return 0; + + return kern_addr_valid(vaddr); +} + +void cheetah_cee_handler(struct pt_regs *regs, unsigned long afsr, unsigned long afar) +{ + struct cheetah_err_info local_snapshot, *p; + int recoverable, is_memory; + + p = cheetah_get_error_log(afsr); + if (!p) { + prom_printf("ERROR: Early CEE error afsr[%016lx] afar[%016lx]\n", + afsr, afar); + prom_printf("ERROR: CPU(%d) TPC[%016lx] TNPC[%016lx] TSTATE[%016lx]\n", + smp_processor_id(), regs->tpc, regs->tnpc, regs->tstate); + prom_halt(); + } + + /* Grab snapshot of logged error. */ + memcpy(&local_snapshot, p, sizeof(local_snapshot)); + + /* If the current trap snapshot does not match what the + * trap handler passed along into our args, big trouble. + * In such a case, mark the local copy as invalid. + * + * Else, it matches and we mark the afsr in the non-local + * copy as invalid so we may log new error traps there. + */ + if (p->afsr != afsr || p->afar != afar) + local_snapshot.afsr = CHAFSR_INVALID; + else + p->afsr = CHAFSR_INVALID; + + is_memory = cheetah_check_main_memory(afar); + + if (is_memory && (afsr & CHAFSR_CE) != 0UL) { + /* XXX Might want to log the results of this operation + * XXX somewhere... -DaveM + */ + cheetah_fix_ce(afar); + } + + { + int flush_all, flush_line; + + flush_all = flush_line = 0; + if ((afsr & CHAFSR_EDC) != 0UL) { + if ((afsr & cheetah_afsr_errors) == CHAFSR_EDC) + flush_line = 1; + else + flush_all = 1; + } else if ((afsr & CHAFSR_CPC) != 0UL) { + if ((afsr & cheetah_afsr_errors) == CHAFSR_CPC) + flush_line = 1; + else + flush_all = 1; + } + + /* Trap handler only disabled I-cache, flush it. */ + cheetah_flush_icache(); + + /* Re-enable I-cache */ + __asm__ __volatile__("ldxa [%%g0] %0, %%g1\n\t" + "or %%g1, %1, %%g1\n\t" + "stxa %%g1, [%%g0] %0\n\t" + "membar #Sync" + : /* no outputs */ + : "i" (ASI_DCU_CONTROL_REG), + "i" (DCU_IC) + : "g1"); + + if (flush_all) + cheetah_flush_ecache(); + else if (flush_line) + cheetah_flush_ecache_line(afar); + } + + /* Re-enable error reporting */ + __asm__ __volatile__("ldxa [%%g0] %0, %%g1\n\t" + "or %%g1, %1, %%g1\n\t" + "stxa %%g1, [%%g0] %0\n\t" + "membar #Sync" + : /* no outputs */ + : "i" (ASI_ESTATE_ERROR_EN), + "i" (ESTATE_ERROR_CEEN) + : "g1"); + + /* Decide if we can continue after handling this trap and + * logging the error. + */ + recoverable = 1; + if (afsr & (CHAFSR_PERR | CHAFSR_IERR | CHAFSR_ISAP)) + recoverable = 0; + + /* Re-check AFSR/AFAR */ + (void) cheetah_recheck_errors(&local_snapshot); + + /* Log errors. */ + cheetah_log_errors(regs, &local_snapshot, afsr, afar, recoverable); + + if (!recoverable) + panic("Irrecoverable Correctable-ECC error trap.\n"); +} + +void cheetah_deferred_handler(struct pt_regs *regs, unsigned long afsr, unsigned long afar) +{ + struct cheetah_err_info local_snapshot, *p; + int recoverable, is_memory; + +#ifdef CONFIG_PCI + /* Check for the special PCI poke sequence. */ + if (pci_poke_in_progress && pci_poke_cpu == smp_processor_id()) { + cheetah_flush_icache(); + cheetah_flush_dcache(); + + /* Re-enable I-cache/D-cache */ + __asm__ __volatile__("ldxa [%%g0] %0, %%g1\n\t" + "or %%g1, %1, %%g1\n\t" + "stxa %%g1, [%%g0] %0\n\t" + "membar #Sync" + : /* no outputs */ + : "i" (ASI_DCU_CONTROL_REG), + "i" (DCU_DC | DCU_IC) + : "g1"); + + /* Re-enable error reporting */ + __asm__ __volatile__("ldxa [%%g0] %0, %%g1\n\t" + "or %%g1, %1, %%g1\n\t" + "stxa %%g1, [%%g0] %0\n\t" + "membar #Sync" + : /* no outputs */ + : "i" (ASI_ESTATE_ERROR_EN), + "i" (ESTATE_ERROR_NCEEN | ESTATE_ERROR_CEEN) + : "g1"); + + (void) cheetah_recheck_errors(NULL); + + pci_poke_faulted = 1; + regs->tpc += 4; + regs->tnpc = regs->tpc + 4; + return; + } +#endif + + p = cheetah_get_error_log(afsr); + if (!p) { + prom_printf("ERROR: Early deferred error afsr[%016lx] afar[%016lx]\n", + afsr, afar); + prom_printf("ERROR: CPU(%d) TPC[%016lx] TNPC[%016lx] TSTATE[%016lx]\n", + smp_processor_id(), regs->tpc, regs->tnpc, regs->tstate); + prom_halt(); + } + + /* Grab snapshot of logged error. */ + memcpy(&local_snapshot, p, sizeof(local_snapshot)); + + /* If the current trap snapshot does not match what the + * trap handler passed along into our args, big trouble. + * In such a case, mark the local copy as invalid. + * + * Else, it matches and we mark the afsr in the non-local + * copy as invalid so we may log new error traps there. + */ + if (p->afsr != afsr || p->afar != afar) + local_snapshot.afsr = CHAFSR_INVALID; + else + p->afsr = CHAFSR_INVALID; + + is_memory = cheetah_check_main_memory(afar); + + { + int flush_all, flush_line; + + flush_all = flush_line = 0; + if ((afsr & CHAFSR_EDU) != 0UL) { + if ((afsr & cheetah_afsr_errors) == CHAFSR_EDU) + flush_line = 1; + else + flush_all = 1; + } else if ((afsr & CHAFSR_BERR) != 0UL) { + if ((afsr & cheetah_afsr_errors) == CHAFSR_BERR) + flush_line = 1; + else + flush_all = 1; + } + + cheetah_flush_icache(); + cheetah_flush_dcache(); + + /* Re-enable I/D caches */ + __asm__ __volatile__("ldxa [%%g0] %0, %%g1\n\t" + "or %%g1, %1, %%g1\n\t" + "stxa %%g1, [%%g0] %0\n\t" + "membar #Sync" + : /* no outputs */ + : "i" (ASI_DCU_CONTROL_REG), + "i" (DCU_IC | DCU_DC) + : "g1"); + + if (flush_all) + cheetah_flush_ecache(); + else if (flush_line) + cheetah_flush_ecache_line(afar); + } + + /* Re-enable error reporting */ + __asm__ __volatile__("ldxa [%%g0] %0, %%g1\n\t" + "or %%g1, %1, %%g1\n\t" + "stxa %%g1, [%%g0] %0\n\t" + "membar #Sync" + : /* no outputs */ + : "i" (ASI_ESTATE_ERROR_EN), + "i" (ESTATE_ERROR_NCEEN | ESTATE_ERROR_CEEN) + : "g1"); + + /* Decide if we can continue after handling this trap and + * logging the error. + */ + recoverable = 1; + if (afsr & (CHAFSR_PERR | CHAFSR_IERR | CHAFSR_ISAP)) + recoverable = 0; + + /* Re-check AFSR/AFAR. What we are looking for here is whether a new + * error was logged while we had error reporting traps disabled. + */ + if (cheetah_recheck_errors(&local_snapshot)) { + unsigned long new_afsr = local_snapshot.afsr; + + /* If we got a new asynchronous error, die... */ + if (new_afsr & (CHAFSR_EMU | CHAFSR_EDU | + CHAFSR_WDU | CHAFSR_CPU | + CHAFSR_IVU | CHAFSR_UE | + CHAFSR_BERR | CHAFSR_TO)) + recoverable = 0; + } + + /* Log errors. */ + cheetah_log_errors(regs, &local_snapshot, afsr, afar, recoverable); + + /* "Recoverable" here means we try to yank the page from ever + * being newly used again. This depends upon a few things: + * 1) Must be main memory, and AFAR must be valid. + * 2) If we trapped from user, OK. + * 3) Else, if we trapped from kernel we must find exception + * table entry (ie. we have to have been accessing user + * space). + * + * If AFAR is not in main memory, or we trapped from kernel + * and cannot find an exception table entry, it is unacceptable + * to try and continue. + */ + if (recoverable && is_memory) { + if ((regs->tstate & TSTATE_PRIV) == 0UL) { + /* OK, usermode access. */ + recoverable = 1; + } else { + const struct exception_table_entry *entry; + + entry = search_exception_tables(regs->tpc); + if (entry) { + /* OK, kernel access to userspace. */ + recoverable = 1; + + } else { + /* BAD, privileged state is corrupted. */ + recoverable = 0; + } + + if (recoverable) { + if (pfn_valid(afar >> PAGE_SHIFT)) + get_page(pfn_to_page(afar >> PAGE_SHIFT)); + else + recoverable = 0; + + /* Only perform fixup if we still have a + * recoverable condition. + */ + if (recoverable) { + regs->tpc = entry->fixup; + regs->tnpc = regs->tpc + 4; + } + } + } + } else { + recoverable = 0; + } + + if (!recoverable) + panic("Irrecoverable deferred error trap.\n"); +} + +/* Handle a D/I cache parity error trap. TYPE is encoded as: + * + * Bit0: 0=dcache,1=icache + * Bit1: 0=recoverable,1=unrecoverable + * + * The hardware has disabled both the I-cache and D-cache in + * the %dcr register. + */ +void cheetah_plus_parity_error(int type, struct pt_regs *regs) +{ + if (type & 0x1) + __cheetah_flush_icache(); + else + cheetah_plus_zap_dcache_parity(); + cheetah_flush_dcache(); + + /* Re-enable I-cache/D-cache */ + __asm__ __volatile__("ldxa [%%g0] %0, %%g1\n\t" + "or %%g1, %1, %%g1\n\t" + "stxa %%g1, [%%g0] %0\n\t" + "membar #Sync" + : /* no outputs */ + : "i" (ASI_DCU_CONTROL_REG), + "i" (DCU_DC | DCU_IC) + : "g1"); + + if (type & 0x2) { + printk(KERN_EMERG "CPU[%d]: Cheetah+ %c-cache parity error at TPC[%016lx]\n", + smp_processor_id(), + (type & 0x1) ? 'I' : 'D', + regs->tpc); + printk(KERN_EMERG "TPC<%pS>\n", (void *) regs->tpc); + panic("Irrecoverable Cheetah+ parity error."); + } + + printk(KERN_WARNING "CPU[%d]: Cheetah+ %c-cache parity error at TPC[%016lx]\n", + smp_processor_id(), + (type & 0x1) ? 'I' : 'D', + regs->tpc); + printk(KERN_WARNING "TPC<%pS>\n", (void *) regs->tpc); +} + +struct sun4v_error_entry { + /* Unique error handle */ +/*0x00*/u64 err_handle; + + /* %stick value at the time of the error */ +/*0x08*/u64 err_stick; + +/*0x10*/u8 reserved_1[3]; + + /* Error type */ +/*0x13*/u8 err_type; +#define SUN4V_ERR_TYPE_UNDEFINED 0 +#define SUN4V_ERR_TYPE_UNCORRECTED_RES 1 +#define SUN4V_ERR_TYPE_PRECISE_NONRES 2 +#define SUN4V_ERR_TYPE_DEFERRED_NONRES 3 +#define SUN4V_ERR_TYPE_SHUTDOWN_RQST 4 +#define SUN4V_ERR_TYPE_DUMP_CORE 5 +#define SUN4V_ERR_TYPE_SP_STATE_CHANGE 6 +#define SUN4V_ERR_TYPE_NUM 7 + + /* Error attributes */ +/*0x14*/u32 err_attrs; +#define SUN4V_ERR_ATTRS_PROCESSOR 0x00000001 +#define SUN4V_ERR_ATTRS_MEMORY 0x00000002 +#define SUN4V_ERR_ATTRS_PIO 0x00000004 +#define SUN4V_ERR_ATTRS_INT_REGISTERS 0x00000008 +#define SUN4V_ERR_ATTRS_FPU_REGISTERS 0x00000010 +#define SUN4V_ERR_ATTRS_SHUTDOWN_RQST 0x00000020 +#define SUN4V_ERR_ATTRS_ASR 0x00000040 +#define SUN4V_ERR_ATTRS_ASI 0x00000080 +#define SUN4V_ERR_ATTRS_PRIV_REG 0x00000100 +#define SUN4V_ERR_ATTRS_SPSTATE_MSK 0x00000600 +#define SUN4V_ERR_ATTRS_MCD 0x00000800 +#define SUN4V_ERR_ATTRS_SPSTATE_SHFT 9 +#define SUN4V_ERR_ATTRS_MODE_MSK 0x03000000 +#define SUN4V_ERR_ATTRS_MODE_SHFT 24 +#define SUN4V_ERR_ATTRS_RES_QUEUE_FULL 0x80000000 + +#define SUN4V_ERR_SPSTATE_FAULTED 0 +#define SUN4V_ERR_SPSTATE_AVAILABLE 1 +#define SUN4V_ERR_SPSTATE_NOT_PRESENT 2 + +#define SUN4V_ERR_MODE_USER 1 +#define SUN4V_ERR_MODE_PRIV 2 + + /* Real address of the memory region or PIO transaction */ +/*0x18*/u64 err_raddr; + + /* Size of the operation triggering the error, in bytes */ +/*0x20*/u32 err_size; + + /* ID of the CPU */ +/*0x24*/u16 err_cpu; + + /* Grace periof for shutdown, in seconds */ +/*0x26*/u16 err_secs; + + /* Value of the %asi register */ +/*0x28*/u8 err_asi; + +/*0x29*/u8 reserved_2; + + /* Value of the ASR register number */ +/*0x2a*/u16 err_asr; +#define SUN4V_ERR_ASR_VALID 0x8000 + +/*0x2c*/u32 reserved_3; +/*0x30*/u64 reserved_4; +/*0x38*/u64 reserved_5; +}; + +static atomic_t sun4v_resum_oflow_cnt = ATOMIC_INIT(0); +static atomic_t sun4v_nonresum_oflow_cnt = ATOMIC_INIT(0); + +static const char *sun4v_err_type_to_str(u8 type) +{ + static const char *types[SUN4V_ERR_TYPE_NUM] = { + "undefined", + "uncorrected resumable", + "precise nonresumable", + "deferred nonresumable", + "shutdown request", + "dump core", + "SP state change", + }; + + if (type < SUN4V_ERR_TYPE_NUM) + return types[type]; + + return "unknown"; +} + +static void sun4v_emit_err_attr_strings(u32 attrs) +{ + static const char *attr_names[] = { + "processor", + "memory", + "PIO", + "int-registers", + "fpu-registers", + "shutdown-request", + "ASR", + "ASI", + "priv-reg", + }; + static const char *sp_states[] = { + "sp-faulted", + "sp-available", + "sp-not-present", + "sp-state-reserved", + }; + static const char *modes[] = { + "mode-reserved0", + "user", + "priv", + "mode-reserved1", + }; + u32 sp_state, mode; + int i; + + for (i = 0; i < ARRAY_SIZE(attr_names); i++) { + if (attrs & (1U << i)) { + const char *s = attr_names[i]; + + pr_cont("%s ", s); + } + } + + sp_state = ((attrs & SUN4V_ERR_ATTRS_SPSTATE_MSK) >> + SUN4V_ERR_ATTRS_SPSTATE_SHFT); + pr_cont("%s ", sp_states[sp_state]); + + mode = ((attrs & SUN4V_ERR_ATTRS_MODE_MSK) >> + SUN4V_ERR_ATTRS_MODE_SHFT); + pr_cont("%s ", modes[mode]); + + if (attrs & SUN4V_ERR_ATTRS_RES_QUEUE_FULL) + pr_cont("res-queue-full "); +} + +/* When the report contains a real-address of "-1" it means that the + * hardware did not provide the address. So we compute the effective + * address of the load or store instruction at regs->tpc and report + * that. Usually when this happens it's a PIO and in such a case we + * are using physical addresses with bypass ASIs anyways, so what we + * report here is exactly what we want. + */ +static void sun4v_report_real_raddr(const char *pfx, struct pt_regs *regs) +{ + unsigned int insn; + u64 addr; + + if (!(regs->tstate & TSTATE_PRIV)) + return; + + insn = *(unsigned int *) regs->tpc; + + addr = compute_effective_address(regs, insn, 0); + + printk("%s: insn effective address [0x%016llx]\n", + pfx, addr); +} + +static void sun4v_log_error(struct pt_regs *regs, struct sun4v_error_entry *ent, + int cpu, const char *pfx, atomic_t *ocnt) +{ + u64 *raw_ptr = (u64 *) ent; + u32 attrs; + int cnt; + + printk("%s: Reporting on cpu %d\n", pfx, cpu); + printk("%s: TPC [0x%016lx] <%pS>\n", + pfx, regs->tpc, (void *) regs->tpc); + + printk("%s: RAW [%016llx:%016llx:%016llx:%016llx\n", + pfx, raw_ptr[0], raw_ptr[1], raw_ptr[2], raw_ptr[3]); + printk("%s: %016llx:%016llx:%016llx:%016llx]\n", + pfx, raw_ptr[4], raw_ptr[5], raw_ptr[6], raw_ptr[7]); + + printk("%s: handle [0x%016llx] stick [0x%016llx]\n", + pfx, ent->err_handle, ent->err_stick); + + printk("%s: type [%s]\n", pfx, sun4v_err_type_to_str(ent->err_type)); + + attrs = ent->err_attrs; + printk("%s: attrs [0x%08x] < ", pfx, attrs); + sun4v_emit_err_attr_strings(attrs); + pr_cont(">\n"); + + /* Various fields in the error report are only valid if + * certain attribute bits are set. + */ + if (attrs & (SUN4V_ERR_ATTRS_MEMORY | + SUN4V_ERR_ATTRS_PIO | + SUN4V_ERR_ATTRS_ASI)) { + printk("%s: raddr [0x%016llx]\n", pfx, ent->err_raddr); + + if (ent->err_raddr == ~(u64)0) + sun4v_report_real_raddr(pfx, regs); + } + + if (attrs & (SUN4V_ERR_ATTRS_MEMORY | SUN4V_ERR_ATTRS_ASI)) + printk("%s: size [0x%x]\n", pfx, ent->err_size); + + if (attrs & (SUN4V_ERR_ATTRS_PROCESSOR | + SUN4V_ERR_ATTRS_INT_REGISTERS | + SUN4V_ERR_ATTRS_FPU_REGISTERS | + SUN4V_ERR_ATTRS_PRIV_REG)) + printk("%s: cpu[%u]\n", pfx, ent->err_cpu); + + if (attrs & SUN4V_ERR_ATTRS_ASI) + printk("%s: asi [0x%02x]\n", pfx, ent->err_asi); + + if ((attrs & (SUN4V_ERR_ATTRS_INT_REGISTERS | + SUN4V_ERR_ATTRS_FPU_REGISTERS | + SUN4V_ERR_ATTRS_PRIV_REG)) && + (ent->err_asr & SUN4V_ERR_ASR_VALID) != 0) + printk("%s: reg [0x%04x]\n", + pfx, ent->err_asr & ~SUN4V_ERR_ASR_VALID); + + show_regs(regs); + + if ((cnt = atomic_read(ocnt)) != 0) { + atomic_set(ocnt, 0); + wmb(); + printk("%s: Queue overflowed %d times.\n", + pfx, cnt); + } +} + +/* Handle memory corruption detected error which is vectored in + * through resumable error trap. + */ +void do_mcd_err(struct pt_regs *regs, struct sun4v_error_entry ent) +{ + if (notify_die(DIE_TRAP, "MCD error", regs, 0, 0x34, + SIGSEGV) == NOTIFY_STOP) + return; + + if (regs->tstate & TSTATE_PRIV) { + /* MCD exception could happen because the task was + * running a system call with MCD enabled and passed a + * non-versioned pointer or pointer with bad version + * tag to the system call. In such cases, hypervisor + * places the address of offending instruction in the + * resumable error report. This is a deferred error, + * so the read/write that caused the trap was potentially + * retired long time back and we may have no choice + * but to send SIGSEGV to the process. + */ + const struct exception_table_entry *entry; + + entry = search_exception_tables(regs->tpc); + if (entry) { + /* Looks like a bad syscall parameter */ +#ifdef DEBUG_EXCEPTIONS + pr_emerg("Exception: PC<%016lx> faddr<UNKNOWN>\n", + regs->tpc); + pr_emerg("EX_TABLE: insn<%016lx> fixup<%016lx>\n", + ent.err_raddr, entry->fixup); +#endif + regs->tpc = entry->fixup; + regs->tnpc = regs->tpc + 4; + return; + } + } + + /* Send SIGSEGV to the userspace process with the right signal + * code + */ + force_sig_fault(SIGSEGV, SEGV_ADIDERR, (void __user *)ent.err_raddr); +} + +/* We run with %pil set to PIL_NORMAL_MAX and PSTATE_IE enabled in %pstate. + * Log the event and clear the first word of the entry. + */ +void sun4v_resum_error(struct pt_regs *regs, unsigned long offset) +{ + enum ctx_state prev_state = exception_enter(); + struct sun4v_error_entry *ent, local_copy; + struct trap_per_cpu *tb; + unsigned long paddr; + int cpu; + + cpu = get_cpu(); + + tb = &trap_block[cpu]; + paddr = tb->resum_kernel_buf_pa + offset; + ent = __va(paddr); + + memcpy(&local_copy, ent, sizeof(struct sun4v_error_entry)); + + /* We have a local copy now, so release the entry. */ + ent->err_handle = 0; + wmb(); + + put_cpu(); + + if (local_copy.err_type == SUN4V_ERR_TYPE_SHUTDOWN_RQST) { + /* We should really take the seconds field of + * the error report and use it for the shutdown + * invocation, but for now do the same thing we + * do for a DS shutdown request. + */ + pr_info("Shutdown request, %u seconds...\n", + local_copy.err_secs); + orderly_poweroff(true); + goto out; + } + + /* If this is a memory corruption detected error vectored in + * by HV through resumable error trap, call the handler + */ + if (local_copy.err_attrs & SUN4V_ERR_ATTRS_MCD) { + do_mcd_err(regs, local_copy); + return; + } + + sun4v_log_error(regs, &local_copy, cpu, + KERN_ERR "RESUMABLE ERROR", + &sun4v_resum_oflow_cnt); +out: + exception_exit(prev_state); +} + +/* If we try to printk() we'll probably make matters worse, by trying + * to retake locks this cpu already holds or causing more errors. So + * just bump a counter, and we'll report these counter bumps above. + */ +void sun4v_resum_overflow(struct pt_regs *regs) +{ + atomic_inc(&sun4v_resum_oflow_cnt); +} + +/* Given a set of registers, get the virtual addressi that was being accessed + * by the faulting instructions at tpc. + */ +static unsigned long sun4v_get_vaddr(struct pt_regs *regs) +{ + unsigned int insn; + + if (!copy_from_user(&insn, (void __user *)regs->tpc, 4)) { + return compute_effective_address(regs, insn, + (insn >> 25) & 0x1f); + } + return 0; +} + +/* Attempt to handle non-resumable errors generated from userspace. + * Returns true if the signal was handled, false otherwise. + */ +bool sun4v_nonresum_error_user_handled(struct pt_regs *regs, + struct sun4v_error_entry *ent) { + + unsigned int attrs = ent->err_attrs; + + if (attrs & SUN4V_ERR_ATTRS_MEMORY) { + unsigned long addr = ent->err_raddr; + + if (addr == ~(u64)0) { + /* This seems highly unlikely to ever occur */ + pr_emerg("SUN4V NON-RECOVERABLE ERROR: Memory error detected in unknown location!\n"); + } else { + unsigned long page_cnt = DIV_ROUND_UP(ent->err_size, + PAGE_SIZE); + + /* Break the unfortunate news. */ + pr_emerg("SUN4V NON-RECOVERABLE ERROR: Memory failed at %016lX\n", + addr); + pr_emerg("SUN4V NON-RECOVERABLE ERROR: Claiming %lu ages.\n", + page_cnt); + + while (page_cnt-- > 0) { + if (pfn_valid(addr >> PAGE_SHIFT)) + get_page(pfn_to_page(addr >> PAGE_SHIFT)); + addr += PAGE_SIZE; + } + } + force_sig(SIGKILL); + + return true; + } + if (attrs & SUN4V_ERR_ATTRS_PIO) { + force_sig_fault(SIGBUS, BUS_ADRERR, + (void __user *)sun4v_get_vaddr(regs)); + return true; + } + + /* Default to doing nothing */ + return false; +} + +/* We run with %pil set to PIL_NORMAL_MAX and PSTATE_IE enabled in %pstate. + * Log the event, clear the first word of the entry, and die. + */ +void sun4v_nonresum_error(struct pt_regs *regs, unsigned long offset) +{ + struct sun4v_error_entry *ent, local_copy; + struct trap_per_cpu *tb; + unsigned long paddr; + int cpu; + + cpu = get_cpu(); + + tb = &trap_block[cpu]; + paddr = tb->nonresum_kernel_buf_pa + offset; + ent = __va(paddr); + + memcpy(&local_copy, ent, sizeof(struct sun4v_error_entry)); + + /* We have a local copy now, so release the entry. */ + ent->err_handle = 0; + wmb(); + + put_cpu(); + + if (!(regs->tstate & TSTATE_PRIV) && + sun4v_nonresum_error_user_handled(regs, &local_copy)) { + /* DON'T PANIC: This userspace error was handled. */ + return; + } + +#ifdef CONFIG_PCI + /* Check for the special PCI poke sequence. */ + if (pci_poke_in_progress && pci_poke_cpu == cpu) { + pci_poke_faulted = 1; + regs->tpc += 4; + regs->tnpc = regs->tpc + 4; + return; + } +#endif + + sun4v_log_error(regs, &local_copy, cpu, + KERN_EMERG "NON-RESUMABLE ERROR", + &sun4v_nonresum_oflow_cnt); + + panic("Non-resumable error."); +} + +/* If we try to printk() we'll probably make matters worse, by trying + * to retake locks this cpu already holds or causing more errors. So + * just bump a counter, and we'll report these counter bumps above. + */ +void sun4v_nonresum_overflow(struct pt_regs *regs) +{ + /* XXX Actually even this can make not that much sense. Perhaps + * XXX we should just pull the plug and panic directly from here? + */ + atomic_inc(&sun4v_nonresum_oflow_cnt); +} + +static void sun4v_tlb_error(struct pt_regs *regs) +{ + die_if_kernel("TLB/TSB error", regs); +} + +unsigned long sun4v_err_itlb_vaddr; +unsigned long sun4v_err_itlb_ctx; +unsigned long sun4v_err_itlb_pte; +unsigned long sun4v_err_itlb_error; + +void sun4v_itlb_error_report(struct pt_regs *regs, int tl) +{ + dump_tl1_traplog((struct tl1_traplog *)(regs + 1)); + + printk(KERN_EMERG "SUN4V-ITLB: Error at TPC[%lx], tl %d\n", + regs->tpc, tl); + printk(KERN_EMERG "SUN4V-ITLB: TPC<%pS>\n", (void *) regs->tpc); + printk(KERN_EMERG "SUN4V-ITLB: O7[%lx]\n", regs->u_regs[UREG_I7]); + printk(KERN_EMERG "SUN4V-ITLB: O7<%pS>\n", + (void *) regs->u_regs[UREG_I7]); + printk(KERN_EMERG "SUN4V-ITLB: vaddr[%lx] ctx[%lx] " + "pte[%lx] error[%lx]\n", + sun4v_err_itlb_vaddr, sun4v_err_itlb_ctx, + sun4v_err_itlb_pte, sun4v_err_itlb_error); + + sun4v_tlb_error(regs); +} + +unsigned long sun4v_err_dtlb_vaddr; +unsigned long sun4v_err_dtlb_ctx; +unsigned long sun4v_err_dtlb_pte; +unsigned long sun4v_err_dtlb_error; + +void sun4v_dtlb_error_report(struct pt_regs *regs, int tl) +{ + dump_tl1_traplog((struct tl1_traplog *)(regs + 1)); + + printk(KERN_EMERG "SUN4V-DTLB: Error at TPC[%lx], tl %d\n", + regs->tpc, tl); + printk(KERN_EMERG "SUN4V-DTLB: TPC<%pS>\n", (void *) regs->tpc); + printk(KERN_EMERG "SUN4V-DTLB: O7[%lx]\n", regs->u_regs[UREG_I7]); + printk(KERN_EMERG "SUN4V-DTLB: O7<%pS>\n", + (void *) regs->u_regs[UREG_I7]); + printk(KERN_EMERG "SUN4V-DTLB: vaddr[%lx] ctx[%lx] " + "pte[%lx] error[%lx]\n", + sun4v_err_dtlb_vaddr, sun4v_err_dtlb_ctx, + sun4v_err_dtlb_pte, sun4v_err_dtlb_error); + + sun4v_tlb_error(regs); +} + +void hypervisor_tlbop_error(unsigned long err, unsigned long op) +{ + printk(KERN_CRIT "SUN4V: TLB hv call error %lu for op %lu\n", + err, op); +} + +void hypervisor_tlbop_error_xcall(unsigned long err, unsigned long op) +{ + printk(KERN_CRIT "SUN4V: XCALL TLB hv call error %lu for op %lu\n", + err, op); +} + +static void do_fpe_common(struct pt_regs *regs) +{ + if (regs->tstate & TSTATE_PRIV) { + regs->tpc = regs->tnpc; + regs->tnpc += 4; + } else { + unsigned long fsr = current_thread_info()->xfsr[0]; + int code; + + if (test_thread_flag(TIF_32BIT)) { + regs->tpc &= 0xffffffff; + regs->tnpc &= 0xffffffff; + } + code = FPE_FLTUNK; + if ((fsr & 0x1c000) == (1 << 14)) { + if (fsr & 0x10) + code = FPE_FLTINV; + else if (fsr & 0x08) + code = FPE_FLTOVF; + else if (fsr & 0x04) + code = FPE_FLTUND; + else if (fsr & 0x02) + code = FPE_FLTDIV; + else if (fsr & 0x01) + code = FPE_FLTRES; + } + force_sig_fault(SIGFPE, code, (void __user *)regs->tpc); + } +} + +void do_fpieee(struct pt_regs *regs) +{ + enum ctx_state prev_state = exception_enter(); + + if (notify_die(DIE_TRAP, "fpu exception ieee", regs, + 0, 0x24, SIGFPE) == NOTIFY_STOP) + goto out; + + do_fpe_common(regs); +out: + exception_exit(prev_state); +} + +void do_fpother(struct pt_regs *regs) +{ + enum ctx_state prev_state = exception_enter(); + struct fpustate *f = FPUSTATE; + int ret = 0; + + if (notify_die(DIE_TRAP, "fpu exception other", regs, + 0, 0x25, SIGFPE) == NOTIFY_STOP) + goto out; + + switch ((current_thread_info()->xfsr[0] & 0x1c000)) { + case (2 << 14): /* unfinished_FPop */ + case (3 << 14): /* unimplemented_FPop */ + ret = do_mathemu(regs, f, false); + break; + } + if (ret) + goto out; + do_fpe_common(regs); +out: + exception_exit(prev_state); +} + +void do_tof(struct pt_regs *regs) +{ + enum ctx_state prev_state = exception_enter(); + + if (notify_die(DIE_TRAP, "tagged arithmetic overflow", regs, + 0, 0x26, SIGEMT) == NOTIFY_STOP) + goto out; + + if (regs->tstate & TSTATE_PRIV) + die_if_kernel("Penguin overflow trap from kernel mode", regs); + if (test_thread_flag(TIF_32BIT)) { + regs->tpc &= 0xffffffff; + regs->tnpc &= 0xffffffff; + } + force_sig_fault(SIGEMT, EMT_TAGOVF, (void __user *)regs->tpc); +out: + exception_exit(prev_state); +} + +void do_div0(struct pt_regs *regs) +{ + enum ctx_state prev_state = exception_enter(); + + if (notify_die(DIE_TRAP, "integer division by zero", regs, + 0, 0x28, SIGFPE) == NOTIFY_STOP) + goto out; + + if (regs->tstate & TSTATE_PRIV) + die_if_kernel("TL0: Kernel divide by zero.", regs); + if (test_thread_flag(TIF_32BIT)) { + regs->tpc &= 0xffffffff; + regs->tnpc &= 0xffffffff; + } + force_sig_fault(SIGFPE, FPE_INTDIV, (void __user *)regs->tpc); +out: + exception_exit(prev_state); +} + +static void instruction_dump(unsigned int *pc) +{ + int i; + + if ((((unsigned long) pc) & 3)) + return; + + printk("Instruction DUMP:"); + for (i = -3; i < 6; i++) + printk("%c%08x%c",i?' ':'<',pc[i],i?' ':'>'); + printk("\n"); +} + +static void user_instruction_dump(unsigned int __user *pc) +{ + int i; + unsigned int buf[9]; + + if ((((unsigned long) pc) & 3)) + return; + + if (copy_from_user(buf, pc - 3, sizeof(buf))) + return; + + printk("Instruction DUMP:"); + for (i = 0; i < 9; i++) + printk("%c%08x%c",i==3?' ':'<',buf[i],i==3?' ':'>'); + printk("\n"); +} + +void show_stack(struct task_struct *tsk, unsigned long *_ksp, const char *loglvl) +{ + unsigned long fp, ksp; + struct thread_info *tp; + int count = 0; +#ifdef CONFIG_FUNCTION_GRAPH_TRACER + int graph = 0; +#endif + + ksp = (unsigned long) _ksp; + if (!tsk) + tsk = current; + tp = task_thread_info(tsk); + if (ksp == 0UL) { + if (tsk == current) + asm("mov %%fp, %0" : "=r" (ksp)); + else + ksp = tp->ksp; + } + if (tp == current_thread_info()) + flushw_all(); + + fp = ksp + STACK_BIAS; + + printk("%sCall Trace:\n", loglvl); + do { + struct sparc_stackf *sf; + struct pt_regs *regs; + unsigned long pc; + + if (!kstack_valid(tp, fp)) + break; + sf = (struct sparc_stackf *) fp; + regs = (struct pt_regs *) (sf + 1); + + if (kstack_is_trap_frame(tp, regs)) { + if (!(regs->tstate & TSTATE_PRIV)) + break; + pc = regs->tpc; + fp = regs->u_regs[UREG_I6] + STACK_BIAS; + } else { + pc = sf->callers_pc; + fp = (unsigned long)sf->fp + STACK_BIAS; + } + + print_ip_sym(loglvl, pc); +#ifdef CONFIG_FUNCTION_GRAPH_TRACER + if ((pc + 8UL) == (unsigned long) &return_to_handler) { + struct ftrace_ret_stack *ret_stack; + ret_stack = ftrace_graph_get_ret_stack(tsk, graph); + if (ret_stack) { + pc = ret_stack->ret; + print_ip_sym(loglvl, pc); + graph++; + } + } +#endif + } while (++count < 16); +} + +static inline struct reg_window *kernel_stack_up(struct reg_window *rw) +{ + unsigned long fp = rw->ins[6]; + + if (!fp) + return NULL; + + return (struct reg_window *) (fp + STACK_BIAS); +} + +void __noreturn die_if_kernel(char *str, struct pt_regs *regs) +{ + static int die_counter; + int count = 0; + + /* Amuse the user. */ + printk( +" \\|/ ____ \\|/\n" +" \"@'/ .. \\`@\"\n" +" /_| \\__/ |_\\\n" +" \\__U_/\n"); + + printk("%s(%d): %s [#%d]\n", current->comm, task_pid_nr(current), str, ++die_counter); + notify_die(DIE_OOPS, str, regs, 0, 255, SIGSEGV); + __asm__ __volatile__("flushw"); + show_regs(regs); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); + if (regs->tstate & TSTATE_PRIV) { + struct thread_info *tp = current_thread_info(); + struct reg_window *rw = (struct reg_window *) + (regs->u_regs[UREG_FP] + STACK_BIAS); + + /* Stop the back trace when we hit userland or we + * find some badly aligned kernel stack. + */ + while (rw && + count++ < 30 && + kstack_valid(tp, (unsigned long) rw)) { + printk("Caller[%016lx]: %pS\n", rw->ins[7], + (void *) rw->ins[7]); + + rw = kernel_stack_up(rw); + } + instruction_dump ((unsigned int *) regs->tpc); + } else { + if (test_thread_flag(TIF_32BIT)) { + regs->tpc &= 0xffffffff; + regs->tnpc &= 0xffffffff; + } + user_instruction_dump ((unsigned int __user *) regs->tpc); + } + if (panic_on_oops) + panic("Fatal exception"); + make_task_dead((regs->tstate & TSTATE_PRIV)? SIGKILL : SIGSEGV); +} +EXPORT_SYMBOL(die_if_kernel); + +#define VIS_OPCODE_MASK ((0x3 << 30) | (0x3f << 19)) +#define VIS_OPCODE_VAL ((0x2 << 30) | (0x36 << 19)) + +void do_illegal_instruction(struct pt_regs *regs) +{ + enum ctx_state prev_state = exception_enter(); + unsigned long pc = regs->tpc; + unsigned long tstate = regs->tstate; + u32 insn; + + if (notify_die(DIE_TRAP, "illegal instruction", regs, + 0, 0x10, SIGILL) == NOTIFY_STOP) + goto out; + + if (tstate & TSTATE_PRIV) + die_if_kernel("Kernel illegal instruction", regs); + if (test_thread_flag(TIF_32BIT)) + pc = (u32)pc; + if (get_user(insn, (u32 __user *) pc) != -EFAULT) { + if ((insn & 0xc1ffc000) == 0x81700000) /* POPC */ { + if (handle_popc(insn, regs)) + goto out; + } else if ((insn & 0xc1580000) == 0xc1100000) /* LDQ/STQ */ { + if (handle_ldf_stq(insn, regs)) + goto out; + } else if (tlb_type == hypervisor) { + if ((insn & VIS_OPCODE_MASK) == VIS_OPCODE_VAL) { + if (!vis_emul(regs, insn)) + goto out; + } else { + struct fpustate *f = FPUSTATE; + + /* On UltraSPARC T2 and later, FPU insns which + * are not implemented in HW signal an illegal + * instruction trap and do not set the FP Trap + * Trap in the %fsr to unimplemented_FPop. + */ + if (do_mathemu(regs, f, true)) + goto out; + } + } + } + force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)pc); +out: + exception_exit(prev_state); +} + +void mem_address_unaligned(struct pt_regs *regs, unsigned long sfar, unsigned long sfsr) +{ + enum ctx_state prev_state = exception_enter(); + + if (notify_die(DIE_TRAP, "memory address unaligned", regs, + 0, 0x34, SIGSEGV) == NOTIFY_STOP) + goto out; + + if (regs->tstate & TSTATE_PRIV) { + kernel_unaligned_trap(regs, *((unsigned int *)regs->tpc)); + goto out; + } + if (is_no_fault_exception(regs)) + return; + + force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)sfar); +out: + exception_exit(prev_state); +} + +void sun4v_do_mna(struct pt_regs *regs, unsigned long addr, unsigned long type_ctx) +{ + if (notify_die(DIE_TRAP, "memory address unaligned", regs, + 0, 0x34, SIGSEGV) == NOTIFY_STOP) + return; + + if (regs->tstate & TSTATE_PRIV) { + kernel_unaligned_trap(regs, *((unsigned int *)regs->tpc)); + return; + } + if (is_no_fault_exception(regs)) + return; + + force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *) addr); +} + +/* sun4v_mem_corrupt_detect_precise() - Handle precise exception on an ADI + * tag mismatch. + * + * ADI version tag mismatch on a load from memory always results in a + * precise exception. Tag mismatch on a store to memory will result in + * precise exception if MCDPER or PMCDPER is set to 1. + */ +void sun4v_mem_corrupt_detect_precise(struct pt_regs *regs, unsigned long addr, + unsigned long context) +{ + if (notify_die(DIE_TRAP, "memory corruption precise exception", regs, + 0, 0x8, SIGSEGV) == NOTIFY_STOP) + return; + + if (regs->tstate & TSTATE_PRIV) { + /* MCD exception could happen because the task was running + * a system call with MCD enabled and passed a non-versioned + * pointer or pointer with bad version tag to the system + * call. + */ + const struct exception_table_entry *entry; + + entry = search_exception_tables(regs->tpc); + if (entry) { + /* Looks like a bad syscall parameter */ +#ifdef DEBUG_EXCEPTIONS + pr_emerg("Exception: PC<%016lx> faddr<UNKNOWN>\n", + regs->tpc); + pr_emerg("EX_TABLE: insn<%016lx> fixup<%016lx>\n", + regs->tpc, entry->fixup); +#endif + regs->tpc = entry->fixup; + regs->tnpc = regs->tpc + 4; + return; + } + pr_emerg("%s: ADDR[%016lx] CTX[%lx], going.\n", + __func__, addr, context); + die_if_kernel("MCD precise", regs); + } + + if (test_thread_flag(TIF_32BIT)) { + regs->tpc &= 0xffffffff; + regs->tnpc &= 0xffffffff; + } + force_sig_fault(SIGSEGV, SEGV_ADIPERR, (void __user *)addr); +} + +void do_privop(struct pt_regs *regs) +{ + enum ctx_state prev_state = exception_enter(); + + if (notify_die(DIE_TRAP, "privileged operation", regs, + 0, 0x11, SIGILL) == NOTIFY_STOP) + goto out; + + if (test_thread_flag(TIF_32BIT)) { + regs->tpc &= 0xffffffff; + regs->tnpc &= 0xffffffff; + } + force_sig_fault(SIGILL, ILL_PRVOPC, (void __user *)regs->tpc); +out: + exception_exit(prev_state); +} + +void do_privact(struct pt_regs *regs) +{ + do_privop(regs); +} + +/* Trap level 1 stuff or other traps we should never see... */ +void do_cee(struct pt_regs *regs) +{ + exception_enter(); + die_if_kernel("TL0: Cache Error Exception", regs); +} + +void do_div0_tl1(struct pt_regs *regs) +{ + exception_enter(); + dump_tl1_traplog((struct tl1_traplog *)(regs + 1)); + die_if_kernel("TL1: DIV0 Exception", regs); +} + +void do_fpieee_tl1(struct pt_regs *regs) +{ + exception_enter(); + dump_tl1_traplog((struct tl1_traplog *)(regs + 1)); + die_if_kernel("TL1: FPU IEEE Exception", regs); +} + +void do_fpother_tl1(struct pt_regs *regs) +{ + exception_enter(); + dump_tl1_traplog((struct tl1_traplog *)(regs + 1)); + die_if_kernel("TL1: FPU Other Exception", regs); +} + +void do_ill_tl1(struct pt_regs *regs) +{ + exception_enter(); + dump_tl1_traplog((struct tl1_traplog *)(regs + 1)); + die_if_kernel("TL1: Illegal Instruction Exception", regs); +} + +void do_irq_tl1(struct pt_regs *regs) +{ + exception_enter(); + dump_tl1_traplog((struct tl1_traplog *)(regs + 1)); + die_if_kernel("TL1: IRQ Exception", regs); +} + +void do_lddfmna_tl1(struct pt_regs *regs) +{ + exception_enter(); + dump_tl1_traplog((struct tl1_traplog *)(regs + 1)); + die_if_kernel("TL1: LDDF Exception", regs); +} + +void do_stdfmna_tl1(struct pt_regs *regs) +{ + exception_enter(); + dump_tl1_traplog((struct tl1_traplog *)(regs + 1)); + die_if_kernel("TL1: STDF Exception", regs); +} + +void do_paw(struct pt_regs *regs) +{ + exception_enter(); + die_if_kernel("TL0: Phys Watchpoint Exception", regs); +} + +void do_paw_tl1(struct pt_regs *regs) +{ + exception_enter(); + dump_tl1_traplog((struct tl1_traplog *)(regs + 1)); + die_if_kernel("TL1: Phys Watchpoint Exception", regs); +} + +void do_vaw(struct pt_regs *regs) +{ + exception_enter(); + die_if_kernel("TL0: Virt Watchpoint Exception", regs); +} + +void do_vaw_tl1(struct pt_regs *regs) +{ + exception_enter(); + dump_tl1_traplog((struct tl1_traplog *)(regs + 1)); + die_if_kernel("TL1: Virt Watchpoint Exception", regs); +} + +void do_tof_tl1(struct pt_regs *regs) +{ + exception_enter(); + dump_tl1_traplog((struct tl1_traplog *)(regs + 1)); + die_if_kernel("TL1: Tag Overflow Exception", regs); +} + +void do_getpsr(struct pt_regs *regs) +{ + regs->u_regs[UREG_I0] = tstate_to_psr(regs->tstate); + regs->tpc = regs->tnpc; + regs->tnpc += 4; + if (test_thread_flag(TIF_32BIT)) { + regs->tpc &= 0xffffffff; + regs->tnpc &= 0xffffffff; + } +} + +u64 cpu_mondo_counter[NR_CPUS] = {0}; +struct trap_per_cpu trap_block[NR_CPUS]; +EXPORT_SYMBOL(trap_block); + +/* This can get invoked before sched_init() so play it super safe + * and use hard_smp_processor_id(). + */ +void notrace init_cur_cpu_trap(struct thread_info *t) +{ + int cpu = hard_smp_processor_id(); + struct trap_per_cpu *p = &trap_block[cpu]; + + p->thread = t; + p->pgd_paddr = 0; +} + +extern void thread_info_offsets_are_bolixed_dave(void); +extern void trap_per_cpu_offsets_are_bolixed_dave(void); +extern void tsb_config_offsets_are_bolixed_dave(void); + +/* Only invoked on boot processor. */ +void __init trap_init(void) +{ + /* Compile time sanity check. */ + BUILD_BUG_ON(TI_TASK != offsetof(struct thread_info, task) || + TI_FLAGS != offsetof(struct thread_info, flags) || + TI_CPU != offsetof(struct thread_info, cpu) || + TI_FPSAVED != offsetof(struct thread_info, fpsaved) || + TI_KSP != offsetof(struct thread_info, ksp) || + TI_FAULT_ADDR != offsetof(struct thread_info, + fault_address) || + TI_KREGS != offsetof(struct thread_info, kregs) || + TI_UTRAPS != offsetof(struct thread_info, utraps) || + TI_REG_WINDOW != offsetof(struct thread_info, + reg_window) || + TI_RWIN_SPTRS != offsetof(struct thread_info, + rwbuf_stkptrs) || + TI_GSR != offsetof(struct thread_info, gsr) || + TI_XFSR != offsetof(struct thread_info, xfsr) || + TI_PRE_COUNT != offsetof(struct thread_info, + preempt_count) || + TI_NEW_CHILD != offsetof(struct thread_info, new_child) || + TI_KUNA_REGS != offsetof(struct thread_info, + kern_una_regs) || + TI_KUNA_INSN != offsetof(struct thread_info, + kern_una_insn) || + TI_FPREGS != offsetof(struct thread_info, fpregs) || + (TI_FPREGS & (64 - 1))); + + BUILD_BUG_ON(TRAP_PER_CPU_THREAD != offsetof(struct trap_per_cpu, + thread) || + (TRAP_PER_CPU_PGD_PADDR != + offsetof(struct trap_per_cpu, pgd_paddr)) || + (TRAP_PER_CPU_CPU_MONDO_PA != + offsetof(struct trap_per_cpu, cpu_mondo_pa)) || + (TRAP_PER_CPU_DEV_MONDO_PA != + offsetof(struct trap_per_cpu, dev_mondo_pa)) || + (TRAP_PER_CPU_RESUM_MONDO_PA != + offsetof(struct trap_per_cpu, resum_mondo_pa)) || + (TRAP_PER_CPU_RESUM_KBUF_PA != + offsetof(struct trap_per_cpu, resum_kernel_buf_pa)) || + (TRAP_PER_CPU_NONRESUM_MONDO_PA != + offsetof(struct trap_per_cpu, nonresum_mondo_pa)) || + (TRAP_PER_CPU_NONRESUM_KBUF_PA != + offsetof(struct trap_per_cpu, nonresum_kernel_buf_pa)) || + (TRAP_PER_CPU_FAULT_INFO != + offsetof(struct trap_per_cpu, fault_info)) || + (TRAP_PER_CPU_CPU_MONDO_BLOCK_PA != + offsetof(struct trap_per_cpu, cpu_mondo_block_pa)) || + (TRAP_PER_CPU_CPU_LIST_PA != + offsetof(struct trap_per_cpu, cpu_list_pa)) || + (TRAP_PER_CPU_TSB_HUGE != + offsetof(struct trap_per_cpu, tsb_huge)) || + (TRAP_PER_CPU_TSB_HUGE_TEMP != + offsetof(struct trap_per_cpu, tsb_huge_temp)) || + (TRAP_PER_CPU_IRQ_WORKLIST_PA != + offsetof(struct trap_per_cpu, irq_worklist_pa)) || + (TRAP_PER_CPU_CPU_MONDO_QMASK != + offsetof(struct trap_per_cpu, cpu_mondo_qmask)) || + (TRAP_PER_CPU_DEV_MONDO_QMASK != + offsetof(struct trap_per_cpu, dev_mondo_qmask)) || + (TRAP_PER_CPU_RESUM_QMASK != + offsetof(struct trap_per_cpu, resum_qmask)) || + (TRAP_PER_CPU_NONRESUM_QMASK != + offsetof(struct trap_per_cpu, nonresum_qmask)) || + (TRAP_PER_CPU_PER_CPU_BASE != + offsetof(struct trap_per_cpu, __per_cpu_base))); + + BUILD_BUG_ON((TSB_CONFIG_TSB != + offsetof(struct tsb_config, tsb)) || + (TSB_CONFIG_RSS_LIMIT != + offsetof(struct tsb_config, tsb_rss_limit)) || + (TSB_CONFIG_NENTRIES != + offsetof(struct tsb_config, tsb_nentries)) || + (TSB_CONFIG_REG_VAL != + offsetof(struct tsb_config, tsb_reg_val)) || + (TSB_CONFIG_MAP_VADDR != + offsetof(struct tsb_config, tsb_map_vaddr)) || + (TSB_CONFIG_MAP_PTE != + offsetof(struct tsb_config, tsb_map_pte))); + + /* Attach to the address space of init_task. On SMP we + * do this in smp.c:smp_callin for other cpus. + */ + mmgrab(&init_mm); + current->active_mm = &init_mm; +} |