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Diffstat (limited to 'arch/powerpc/include/asm/paca.h')
| -rw-r--r-- | arch/powerpc/include/asm/paca.h | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h new file mode 100644 index 000000000..e667d455e --- /dev/null +++ b/arch/powerpc/include/asm/paca.h @@ -0,0 +1,303 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * This control block defines the PACA which defines the processor + * specific data for each logical processor on the system. + * There are some pointers defined that are utilized by PLIC. + * + * C 2001 PPC 64 Team, IBM Corp + */ +#ifndef _ASM_POWERPC_PACA_H +#define _ASM_POWERPC_PACA_H +#ifdef __KERNEL__ + +#ifdef CONFIG_PPC64 + +#include <linux/cache.h> +#include <linux/string.h> +#include <asm/types.h> +#include <asm/mmu.h> +#include <asm/page.h> +#ifdef CONFIG_PPC_BOOK3E_64 +#include <asm/exception-64e.h> +#else +#include <asm/exception-64s.h> +#endif +#ifdef CONFIG_KVM_BOOK3S_64_HANDLER +#include <asm/kvm_book3s_asm.h> +#endif +#include <asm/accounting.h> +#include <asm/hmi.h> +#include <asm/cpuidle.h> +#include <asm/atomic.h> +#include <asm/mce.h> + +#include <asm-generic/mmiowb_types.h> + +register struct paca_struct *local_paca asm("r13"); + +#if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP) +extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */ +/* + * Add standard checks that preemption cannot occur when using get_paca(): + * otherwise the paca_struct it points to may be the wrong one just after. + */ +#define get_paca() ((void) debug_smp_processor_id(), local_paca) +#else +#define get_paca() local_paca +#endif + +#define get_slb_shadow() (get_paca()->slb_shadow_ptr) + +struct task_struct; +struct rtas_args; +struct lppaca; + +/* + * Defines the layout of the paca. + * + * This structure is not directly accessed by firmware or the service + * processor. + */ +struct paca_struct { +#ifdef CONFIG_PPC_PSERIES + /* + * Because hw_cpu_id, unlike other paca fields, is accessed + * routinely from other CPUs (from the IRQ code), we stick to + * read-only (after boot) fields in the first cacheline to + * avoid cacheline bouncing. + */ + + struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */ +#endif /* CONFIG_PPC_PSERIES */ + + /* + * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c + * load lock_token and paca_index with a single lwz + * instruction. They must travel together and be properly + * aligned. + */ +#ifdef __BIG_ENDIAN__ + u16 lock_token; /* Constant 0x8000, used in locks */ + u16 paca_index; /* Logical processor number */ +#else + u16 paca_index; /* Logical processor number */ + u16 lock_token; /* Constant 0x8000, used in locks */ +#endif + +#ifndef CONFIG_PPC_KERNEL_PCREL + u64 kernel_toc; /* Kernel TOC address */ +#endif + u64 kernelbase; /* Base address of kernel */ + u64 kernel_msr; /* MSR while running in kernel */ + void *emergency_sp; /* pointer to emergency stack */ + u64 data_offset; /* per cpu data offset */ + s16 hw_cpu_id; /* Physical processor number */ + u8 cpu_start; /* At startup, processor spins until */ + /* this becomes non-zero. */ + u8 kexec_state; /* set when kexec down has irqs off */ +#ifdef CONFIG_PPC_BOOK3S_64 +#ifdef CONFIG_PPC_64S_HASH_MMU + struct slb_shadow *slb_shadow_ptr; +#endif + struct dtl_entry *dispatch_log; + struct dtl_entry *dispatch_log_end; +#endif + u64 dscr_default; /* per-CPU default DSCR */ + +#ifdef CONFIG_PPC_BOOK3S_64 + /* + * Now, starting in cacheline 2, the exception save areas + */ + /* used for most interrupts/exceptions */ + u64 exgen[EX_SIZE] __attribute__((aligned(0x80))); + +#ifdef CONFIG_PPC_64S_HASH_MMU + /* SLB related definitions */ + u16 vmalloc_sllp; + u8 slb_cache_ptr; + u8 stab_rr; /* stab/slb round-robin counter */ +#ifdef CONFIG_DEBUG_VM + u8 in_kernel_slb_handler; +#endif + u32 slb_used_bitmap; /* Bitmaps for first 32 SLB entries. */ + u32 slb_kern_bitmap; + u32 slb_cache[SLB_CACHE_ENTRIES]; +#endif +#endif /* CONFIG_PPC_BOOK3S_64 */ + +#ifdef CONFIG_PPC_BOOK3E_64 + u64 exgen[8] __aligned(0x40); + /* Keep pgd in the same cacheline as the start of extlb */ + pgd_t *pgd __aligned(0x40); /* Current PGD */ + pgd_t *kernel_pgd; /* Kernel PGD */ + + /* Shared by all threads of a core -- points to tcd of first thread */ + struct tlb_core_data *tcd_ptr; + + /* + * We can have up to 3 levels of reentrancy in the TLB miss handler, + * in each of four exception levels (normal, crit, mcheck, debug). + */ + u64 extlb[12][EX_TLB_SIZE / sizeof(u64)]; + u64 exmc[8]; /* used for machine checks */ + u64 excrit[8]; /* used for crit interrupts */ + u64 exdbg[8]; /* used for debug interrupts */ + + /* Kernel stack pointers for use by special exceptions */ + void *mc_kstack; + void *crit_kstack; + void *dbg_kstack; + + struct tlb_core_data tcd; +#endif /* CONFIG_PPC_BOOK3E_64 */ + +#ifdef CONFIG_PPC_64S_HASH_MMU + unsigned char mm_ctx_low_slices_psize[BITS_PER_LONG / BITS_PER_BYTE]; + unsigned char mm_ctx_high_slices_psize[SLICE_ARRAY_SIZE]; +#endif + + /* + * then miscellaneous read-write fields + */ + struct task_struct *__current; /* Pointer to current */ + u64 kstack; /* Saved Kernel stack addr */ + u64 saved_r1; /* r1 save for RTAS calls or PM or EE=0 */ + u64 saved_msr; /* MSR saved here by enter_rtas */ +#ifdef CONFIG_PPC64 + u64 exit_save_r1; /* Syscall/interrupt R1 save */ +#endif +#ifdef CONFIG_PPC_BOOK3E_64 + u16 trap_save; /* Used when bad stack is encountered */ +#endif +#ifdef CONFIG_PPC_BOOK3S_64 + u8 hsrr_valid; /* HSRRs set for HRFID */ + u8 srr_valid; /* SRRs set for RFID */ +#endif + u8 irq_soft_mask; /* mask for irq soft masking */ + u8 irq_happened; /* irq happened while soft-disabled */ + u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */ +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE + u8 pmcregs_in_use; /* pseries puts this in lppaca */ +#endif + u64 sprg_vdso; /* Saved user-visible sprg */ +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + u64 tm_scratch; /* TM scratch area for reclaim */ +#endif + +#ifdef CONFIG_PPC_POWERNV + /* PowerNV idle fields */ + /* PNV_CORE_IDLE_* bits, all siblings work on thread 0 paca */ + unsigned long idle_lock; /* A value of 1 means acquired */ + unsigned long idle_state; + union { + /* P7/P8 specific fields */ + struct { + /* PNV_THREAD_RUNNING/NAP/SLEEP */ + u8 thread_idle_state; + /* Mask to denote subcore sibling threads */ + u8 subcore_sibling_mask; + }; + + /* P9 specific fields */ + struct { +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE + /* The PSSCR value that the kernel requested before going to stop */ + u64 requested_psscr; + /* Flag to request this thread not to stop */ + atomic_t dont_stop; +#endif + }; + }; +#endif + +#ifdef CONFIG_PPC_BOOK3S_64 + /* Non-maskable exceptions that are not performance critical */ + u64 exnmi[EX_SIZE]; /* used for system reset (nmi) */ + u64 exmc[EX_SIZE]; /* used for machine checks */ +#endif +#ifdef CONFIG_PPC_BOOK3S_64 + /* Exclusive stacks for system reset and machine check exception. */ + void *nmi_emergency_sp; + void *mc_emergency_sp; + + u16 in_nmi; /* In nmi handler */ + + /* + * Flag to check whether we are in machine check early handler + * and already using emergency stack. + */ + u16 in_mce; + u8 hmi_event_available; /* HMI event is available */ + u8 hmi_p9_special_emu; /* HMI P9 special emulation */ + u32 hmi_irqs; /* HMI irq stat */ +#endif + u8 ftrace_enabled; /* Hard disable ftrace */ + + /* Stuff for accurate time accounting */ + struct cpu_accounting_data accounting; + u64 dtl_ridx; /* read index in dispatch log */ + struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */ + +#ifdef CONFIG_KVM_BOOK3S_HANDLER +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + /* We use this to store guest state in */ + struct kvmppc_book3s_shadow_vcpu shadow_vcpu; +#endif + struct kvmppc_host_state kvm_hstate; +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE + /* + * Bitmap for sibling subcore status. See kvm/book3s_hv_ras.c for + * more details + */ + struct sibling_subcore_state *sibling_subcore_state; +#endif +#endif +#ifdef CONFIG_PPC_BOOK3S_64 + /* + * rfi fallback flush must be in its own cacheline to prevent + * other paca data leaking into the L1d + */ + u64 exrfi[EX_SIZE] __aligned(0x80); + void *rfi_flush_fallback_area; + u64 l1d_flush_size; +#endif +#ifdef CONFIG_PPC_PSERIES + u8 *mce_data_buf; /* buffer to hold per cpu rtas errlog */ +#endif /* CONFIG_PPC_PSERIES */ + +#ifdef CONFIG_PPC_BOOK3S_64 +#ifdef CONFIG_PPC_64S_HASH_MMU + /* Capture SLB related old contents in MCE handler. */ + struct slb_entry *mce_faulty_slbs; + u16 slb_save_cache_ptr; +#endif +#endif /* CONFIG_PPC_BOOK3S_64 */ +#ifdef CONFIG_STACKPROTECTOR + unsigned long canary; +#endif +#ifdef CONFIG_MMIOWB + struct mmiowb_state mmiowb_state; +#endif +#ifdef CONFIG_PPC_BOOK3S_64 + struct mce_info *mce_info; + u8 mce_pending_irq_work; +#endif /* CONFIG_PPC_BOOK3S_64 */ +} ____cacheline_aligned; + +extern void copy_mm_to_paca(struct mm_struct *mm); +extern struct paca_struct **paca_ptrs; +extern void initialise_paca(struct paca_struct *new_paca, int cpu); +extern void setup_paca(struct paca_struct *new_paca); +extern void allocate_paca_ptrs(void); +extern void allocate_paca(int cpu); +extern void free_unused_pacas(void); + +#else /* CONFIG_PPC64 */ + +static inline void allocate_paca(int cpu) { } +static inline void free_unused_pacas(void) { } + +#endif /* CONFIG_PPC64 */ + +#endif /* __KERNEL__ */ +#endif /* _ASM_POWERPC_PACA_H */ |