54bb7f4bda
Our ppc64 spinlocks and rwlocks use a trick where a lock token and the paca index are placed in the lock with a single store. Since we are using two u16s they need adjusting for little endian. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
191 lines
6.3 KiB
C
191 lines
6.3 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/init.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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#include <asm/exception-64e.h>
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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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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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#define get_lppaca() (get_paca()->lppaca_ptr)
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#define get_slb_shadow() (get_paca()->slb_shadow_ptr)
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struct task_struct;
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struct opal_machine_check_event;
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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_BOOK3S
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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_BOOK3S */
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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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#ifdef CONFIG_PPC_STD_MMU_64
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u64 stab_real; /* Absolute address of segment table */
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u64 stab_addr; /* Virtual address of segment table */
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#endif /* CONFIG_PPC_STD_MMU_64 */
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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_STD_MMU_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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/*
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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[13] __attribute__((aligned(0x80)));
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u64 exmc[13]; /* used for machine checks */
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u64 exslb[13]; /* 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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u16 slb_cache_ptr;
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u32 slb_cache[SLB_CACHE_ENTRIES];
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#endif /* CONFIG_PPC_STD_MMU_64 */
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#ifdef CONFIG_PPC_BOOK3E
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u64 exgen[8] __attribute__((aligned(0x80)));
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/* Keep pgd in the same cacheline as the start of extlb */
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pgd_t *pgd __attribute__((aligned(0x80))); /* Current PGD */
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pgd_t *kernel_pgd; /* Kernel PGD */
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/* We can have up to 3 levels of reentrancy in the TLB miss handler */
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u64 extlb[3][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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#endif /* CONFIG_PPC_BOOK3E */
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mm_context_t context;
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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 stab_rr; /* stab/slb round-robin counter */
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u64 saved_r1; /* r1 save for RTAS calls or PM */
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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 soft_enabled; /* irq soft-enable flag */
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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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u64 sprg3; /* 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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/* Pointer to OPAL machine check event structure set by the
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* early exception handler for use by high level C handler
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*/
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struct opal_machine_check_event *opal_mc_evt;
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#endif
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/* Stuff for accurate time accounting */
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u64 user_time; /* accumulated usermode TB ticks */
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u64 system_time; /* accumulated system TB ticks */
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u64 user_time_scaled; /* accumulated usermode SPURR ticks */
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u64 starttime; /* TB value snapshot */
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u64 starttime_user; /* TB value on exit to usermode */
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u64 startspurr; /* SPURR value snapshot */
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u64 utime_sspurr; /* ->user_time when ->startspurr set */
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u64 stolen_time; /* TB ticks taken by hypervisor */
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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
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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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#endif
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};
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extern struct paca_struct *paca;
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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_pacas(void);
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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_pacas(void) { };
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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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