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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e15a4fea4d
This adds CONFIG_DEBUG_VM checks to ensure: - The kernel stack is in the SLB after it's flushed and bolted. - We don't insert an SLB for an address that is aleady in the SLB. - The kernel SLB miss handler does not take an SLB miss. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
287 lines
8.7 KiB
C
287 lines
8.7 KiB
C
/*
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* This control block defines the PACA which defines the processor
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* specific data for each logical processor on the system.
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* There are some pointers defined that are utilized by PLIC.
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*
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* C 2001 PPC 64 Team, IBM Corp
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _ASM_POWERPC_PACA_H
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#define _ASM_POWERPC_PACA_H
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#ifdef __KERNEL__
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#ifdef CONFIG_PPC64
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#include <linux/string.h>
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#include <asm/types.h>
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#include <asm/lppaca.h>
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#include <asm/mmu.h>
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#include <asm/page.h>
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#ifdef CONFIG_PPC_BOOK3E
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#include <asm/exception-64e.h>
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#else
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#include <asm/exception-64s.h>
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#endif
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#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
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#include <asm/kvm_book3s_asm.h>
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#endif
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#include <asm/accounting.h>
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#include <asm/hmi.h>
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#include <asm/cpuidle.h>
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#include <asm/atomic.h>
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register struct paca_struct *local_paca asm("r13");
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#if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
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extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
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/*
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* Add standard checks that preemption cannot occur when using get_paca():
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* otherwise the paca_struct it points to may be the wrong one just after.
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*/
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#define get_paca() ((void) debug_smp_processor_id(), local_paca)
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#else
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#define get_paca() local_paca
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#endif
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#ifdef CONFIG_PPC_PSERIES
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#define get_lppaca() (get_paca()->lppaca_ptr)
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#endif
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#define get_slb_shadow() (get_paca()->slb_shadow_ptr)
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struct task_struct;
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/*
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* Defines the layout of the paca.
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*
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* This structure is not directly accessed by firmware or the service
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* processor.
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*/
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struct paca_struct {
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#ifdef CONFIG_PPC_PSERIES
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/*
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* Because hw_cpu_id, unlike other paca fields, is accessed
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* routinely from other CPUs (from the IRQ code), we stick to
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* read-only (after boot) fields in the first cacheline to
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* avoid cacheline bouncing.
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*/
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struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */
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#endif /* CONFIG_PPC_PSERIES */
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/*
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* MAGIC: the spinlock functions in arch/powerpc/lib/locks.c
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* load lock_token and paca_index with a single lwz
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* instruction. They must travel together and be properly
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* aligned.
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*/
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#ifdef __BIG_ENDIAN__
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u16 lock_token; /* Constant 0x8000, used in locks */
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u16 paca_index; /* Logical processor number */
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#else
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u16 paca_index; /* Logical processor number */
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u16 lock_token; /* Constant 0x8000, used in locks */
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#endif
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u64 kernel_toc; /* Kernel TOC address */
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u64 kernelbase; /* Base address of kernel */
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u64 kernel_msr; /* MSR while running in kernel */
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void *emergency_sp; /* pointer to emergency stack */
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u64 data_offset; /* per cpu data offset */
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s16 hw_cpu_id; /* Physical processor number */
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u8 cpu_start; /* At startup, processor spins until */
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/* this becomes non-zero. */
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u8 kexec_state; /* set when kexec down has irqs off */
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#ifdef CONFIG_PPC_BOOK3S_64
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struct slb_shadow *slb_shadow_ptr;
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struct dtl_entry *dispatch_log;
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struct dtl_entry *dispatch_log_end;
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#endif
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u64 dscr_default; /* per-CPU default DSCR */
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#ifdef CONFIG_PPC_BOOK3S_64
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/*
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* Now, starting in cacheline 2, the exception save areas
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*/
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/* used for most interrupts/exceptions */
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u64 exgen[EX_SIZE] __attribute__((aligned(0x80)));
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u64 exslb[EX_SIZE]; /* used for SLB/segment table misses
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* on the linear mapping */
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/* SLB related definitions */
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u16 vmalloc_sllp;
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u8 slb_cache_ptr;
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u8 stab_rr; /* stab/slb round-robin counter */
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#ifdef CONFIG_DEBUG_VM
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u8 in_kernel_slb_handler;
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#endif
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u32 slb_used_bitmap; /* Bitmaps for first 32 SLB entries. */
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u32 slb_kern_bitmap;
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u32 slb_cache[SLB_CACHE_ENTRIES];
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#endif /* CONFIG_PPC_BOOK3S_64 */
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#ifdef CONFIG_PPC_BOOK3E
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u64 exgen[8] __aligned(0x40);
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/* Keep pgd in the same cacheline as the start of extlb */
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pgd_t *pgd __aligned(0x40); /* Current PGD */
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pgd_t *kernel_pgd; /* Kernel PGD */
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/* Shared by all threads of a core -- points to tcd of first thread */
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struct tlb_core_data *tcd_ptr;
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/*
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* We can have up to 3 levels of reentrancy in the TLB miss handler,
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* in each of four exception levels (normal, crit, mcheck, debug).
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*/
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u64 extlb[12][EX_TLB_SIZE / sizeof(u64)];
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u64 exmc[8]; /* used for machine checks */
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u64 excrit[8]; /* used for crit interrupts */
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u64 exdbg[8]; /* used for debug interrupts */
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/* Kernel stack pointers for use by special exceptions */
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void *mc_kstack;
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void *crit_kstack;
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void *dbg_kstack;
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struct tlb_core_data tcd;
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#endif /* CONFIG_PPC_BOOK3E */
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#ifdef CONFIG_PPC_BOOK3S
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mm_context_id_t mm_ctx_id;
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#ifdef CONFIG_PPC_MM_SLICES
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unsigned char mm_ctx_low_slices_psize[BITS_PER_LONG / BITS_PER_BYTE];
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unsigned char mm_ctx_high_slices_psize[SLICE_ARRAY_SIZE];
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unsigned long mm_ctx_slb_addr_limit;
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#else
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u16 mm_ctx_user_psize;
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u16 mm_ctx_sllp;
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#endif
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#endif
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/*
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* then miscellaneous read-write fields
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*/
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struct task_struct *__current; /* Pointer to current */
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u64 kstack; /* Saved Kernel stack addr */
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u64 saved_r1; /* r1 save for RTAS calls or PM or EE=0 */
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u64 saved_msr; /* MSR saved here by enter_rtas */
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u16 trap_save; /* Used when bad stack is encountered */
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u8 irq_soft_mask; /* mask for irq soft masking */
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u8 irq_happened; /* irq happened while soft-disabled */
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u8 io_sync; /* writel() needs spin_unlock sync */
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u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */
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u8 nap_state_lost; /* NV GPR values lost in power7_idle */
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#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
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u8 pmcregs_in_use; /* pseries puts this in lppaca */
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#endif
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u64 sprg_vdso; /* Saved user-visible sprg */
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#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
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u64 tm_scratch; /* TM scratch area for reclaim */
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#endif
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#ifdef CONFIG_PPC_POWERNV
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/* Per-core mask tracking idle threads and a lock bit-[L][TTTTTTTT] */
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u32 *core_idle_state_ptr;
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u8 thread_idle_state; /* PNV_THREAD_RUNNING/NAP/SLEEP */
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/* Mask to indicate thread id in core */
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u8 thread_mask;
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/* Mask to denote subcore sibling threads */
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u8 subcore_sibling_mask;
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/* Flag to request this thread not to stop */
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atomic_t dont_stop;
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/* The PSSCR value that the kernel requested before going to stop */
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u64 requested_psscr;
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/*
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* Save area for additional SPRs that need to be
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* saved/restored during cpuidle stop.
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*/
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struct stop_sprs stop_sprs;
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#endif
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#ifdef CONFIG_PPC_BOOK3S_64
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/* Non-maskable exceptions that are not performance critical */
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u64 exnmi[EX_SIZE]; /* used for system reset (nmi) */
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u64 exmc[EX_SIZE]; /* used for machine checks */
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#endif
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#ifdef CONFIG_PPC_BOOK3S_64
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/* Exclusive stacks for system reset and machine check exception. */
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void *nmi_emergency_sp;
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void *mc_emergency_sp;
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u16 in_nmi; /* In nmi handler */
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/*
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* Flag to check whether we are in machine check early handler
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* and already using emergency stack.
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*/
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u16 in_mce;
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u8 hmi_event_available; /* HMI event is available */
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u8 hmi_p9_special_emu; /* HMI P9 special emulation */
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#endif
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u8 ftrace_enabled; /* Hard disable ftrace */
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/* Stuff for accurate time accounting */
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struct cpu_accounting_data accounting;
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u64 dtl_ridx; /* read index in dispatch log */
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struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */
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#ifdef CONFIG_KVM_BOOK3S_HANDLER
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#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
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/* We use this to store guest state in */
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struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
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#endif
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struct kvmppc_host_state kvm_hstate;
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#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
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/*
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* Bitmap for sibling subcore status. See kvm/book3s_hv_ras.c for
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* more details
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*/
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struct sibling_subcore_state *sibling_subcore_state;
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#endif
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#endif
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#ifdef CONFIG_PPC_BOOK3S_64
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/*
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* rfi fallback flush must be in its own cacheline to prevent
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* other paca data leaking into the L1d
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*/
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u64 exrfi[EX_SIZE] __aligned(0x80);
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void *rfi_flush_fallback_area;
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u64 l1d_flush_size;
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#endif
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#ifdef CONFIG_PPC_PSERIES
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u8 *mce_data_buf; /* buffer to hold per cpu rtas errlog */
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#endif /* CONFIG_PPC_PSERIES */
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#ifdef CONFIG_PPC_BOOK3S_64
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/* Capture SLB related old contents in MCE handler. */
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struct slb_entry *mce_faulty_slbs;
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u16 slb_save_cache_ptr;
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#endif /* CONFIG_PPC_BOOK3S_64 */
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#ifdef CONFIG_STACKPROTECTOR
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unsigned long canary;
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#endif
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} ____cacheline_aligned;
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extern void copy_mm_to_paca(struct mm_struct *mm);
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extern struct paca_struct **paca_ptrs;
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extern void initialise_paca(struct paca_struct *new_paca, int cpu);
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extern void setup_paca(struct paca_struct *new_paca);
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extern void allocate_paca_ptrs(void);
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extern void allocate_paca(int cpu);
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extern void free_unused_pacas(void);
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#else /* CONFIG_PPC64 */
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static inline void allocate_paca_ptrs(void) { };
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static inline void allocate_paca(int cpu) { };
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static inline void free_unused_pacas(void) { };
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#endif /* CONFIG_PPC64 */
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_PACA_H */
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