arch/powerpc/include/asm/paca.h

   1 /*
   2  * This control block defines the PACA which defines the processor
   3  * specific data for each logical processor on the system.
   4  * There are some pointers defined that are utilized by PLIC.
   5  *
   6  * C 2001 PPC 64 Team, IBM Corp
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * as published by the Free Software Foundation; either version
  11  * 2 of the License, or (at your option) any later version.
  12  */
  13 #ifndef _ASM_POWERPC_PACA_H
  14 #define _ASM_POWERPC_PACA_H
  15 #ifdef __KERNEL__
  16
  17 #ifdef CONFIG_PPC64
  18
  19 #include <linux/init.h>
  20 #include <asm/types.h>
  21 #include <asm/lppaca.h>
  22 #include <asm/mmu.h>
  23 #include <asm/page.h>
  24 #include <asm/exception-64e.h>
  25 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
  26 #include <asm/kvm_book3s_asm.h>
  27 #endif
  28
  29 register struct paca_struct *local_paca asm("r13");
  30
  31 #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
  32 extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
  33 /*
  34  * Add standard checks that preemption cannot occur when using get_paca():
  35  * otherwise the paca_struct it points to may be the wrong one just after.
  36  */
  37 #define get_paca()      ((void) debug_smp_processor_id(), local_paca)
  38 #else
  39 #define get_paca()      local_paca
  40 #endif
  41
  42 #define get_lppaca()    (get_paca()->lppaca_ptr)
  43 #define get_slb_shadow()        (get_paca()->slb_shadow_ptr)
  44
  45 struct task_struct;
  46 struct opal_machine_check_event;
  47
  48 /*
  49  * Defines the layout of the paca.
  50  *
  51  * This structure is not directly accessed by firmware or the service
  52  * processor.
  53  */
  54 struct paca_struct {
  55 #ifdef CONFIG_PPC_BOOK3S
  56         /*
  57          * Because hw_cpu_id, unlike other paca fields, is accessed
  58          * routinely from other CPUs (from the IRQ code), we stick to
  59          * read-only (after boot) fields in the first cacheline to
  60          * avoid cacheline bouncing.
  61          */
  62
  63         struct lppaca *lppaca_ptr;      /* Pointer to LpPaca for PLIC */
  64 #endif /* CONFIG_PPC_BOOK3S */
  65         /*
  66          * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c
  67          * load lock_token and paca_index with a single lwz
  68          * instruction.  They must travel together and be properly
  69          * aligned.
  70          */
  71         u16 lock_token;                 /* Constant 0x8000, used in locks */
  72         u16 paca_index;                 /* Logical processor number */
  73
  74         u64 kernel_toc;                 /* Kernel TOC address */
  75         u64 kernelbase;                 /* Base address of kernel */
  76         u64 kernel_msr;                 /* MSR while running in kernel */
  77 #ifdef CONFIG_PPC_STD_MMU_64
  78         u64 stab_real;                  /* Absolute address of segment table */
  79         u64 stab_addr;                  /* Virtual address of segment table */
  80 #endif /* CONFIG_PPC_STD_MMU_64 */
  81         void *emergency_sp;             /* pointer to emergency stack */
  82         u64 data_offset;                /* per cpu data offset */
  83         s16 hw_cpu_id;                  /* Physical processor number */
  84         u8 cpu_start;                   /* At startup, processor spins until */
  85                                         /* this becomes non-zero. */
  86         u8 kexec_state;         /* set when kexec down has irqs off */
  87 #ifdef CONFIG_PPC_STD_MMU_64
  88         struct slb_shadow *slb_shadow_ptr;
  89         struct dtl_entry *dispatch_log;
  90         struct dtl_entry *dispatch_log_end;
  91
  92         /*
  93          * Now, starting in cacheline 2, the exception save areas
  94          */
  95         /* used for most interrupts/exceptions */
  96         u64 exgen[12] __attribute__((aligned(0x80)));
  97         u64 exmc[12];           /* used for machine checks */
  98         u64 exslb[12];          /* used for SLB/segment table misses
  99                                  * on the linear mapping */
 100         /* SLB related definitions */
 101         u16 vmalloc_sllp;
 102         u16 slb_cache_ptr;
 103         u32 slb_cache[SLB_CACHE_ENTRIES];
 104 #endif /* CONFIG_PPC_STD_MMU_64 */
 105
 106 #ifdef CONFIG_PPC_BOOK3E
 107         u64 exgen[8] __attribute__((aligned(0x80)));
 108         /* Keep pgd in the same cacheline as the start of extlb */
 109         pgd_t *pgd __attribute__((aligned(0x80))); /* Current PGD */
 110         pgd_t *kernel_pgd;              /* Kernel PGD */
 111         /* We can have up to 3 levels of reentrancy in the TLB miss handler */
 112         u64 extlb[3][EX_TLB_SIZE / sizeof(u64)];
 113         u64 exmc[8];            /* used for machine checks */
 114         u64 excrit[8];          /* used for crit interrupts */
 115         u64 exdbg[8];           /* used for debug interrupts */
 116
 117         /* Kernel stack pointers for use by special exceptions */
 118         void *mc_kstack;
 119         void *crit_kstack;
 120         void *dbg_kstack;
 121 #endif /* CONFIG_PPC_BOOK3E */
 122
 123         mm_context_t context;
 124
 125         /*
 126          * then miscellaneous read-write fields
 127          */
 128         struct task_struct *__current;  /* Pointer to current */
 129         u64 kstack;                     /* Saved Kernel stack addr */
 130         u64 stab_rr;                    /* stab/slb round-robin counter */
 131         u64 saved_r1;                   /* r1 save for RTAS calls or PM */
 132         u64 saved_msr;                  /* MSR saved here by enter_rtas */
 133         u16 trap_save;                  /* Used when bad stack is encountered */
 134         u8 soft_enabled;                /* irq soft-enable flag */
 135         u8 irq_happened;                /* irq happened while soft-disabled */
 136         u8 io_sync;                     /* writel() needs spin_unlock sync */
 137         u8 irq_work_pending;            /* IRQ_WORK interrupt while soft-disable */
 138         u8 nap_state_lost;              /* NV GPR values lost in power7_idle */
 139         u64 sprg3;                      /* Saved user-visible sprg */
 140 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 141         u64 tm_scratch;                 /* TM scratch area for reclaim */
 142 #endif
 143
 144 #ifdef CONFIG_PPC_POWERNV
 145         /* Pointer to OPAL machine check event structure set by the
 146          * early exception handler for use by high level C handler
 147          */
 148         struct opal_machine_check_event *opal_mc_evt;
 149 #endif
 150
 151         /* Stuff for accurate time accounting */
 152         u64 user_time;                  /* accumulated usermode TB ticks */
 153         u64 system_time;                /* accumulated system TB ticks */
 154         u64 user_time_scaled;           /* accumulated usermode SPURR ticks */
 155         u64 starttime;                  /* TB value snapshot */
 156         u64 starttime_user;             /* TB value on exit to usermode */
 157         u64 startspurr;                 /* SPURR value snapshot */
 158         u64 utime_sspurr;               /* ->user_time when ->startspurr set */
 159         u64 stolen_time;                /* TB ticks taken by hypervisor */
 160         u64 dtl_ridx;                   /* read index in dispatch log */
 161         struct dtl_entry *dtl_curr;     /* pointer corresponding to dtl_ridx */
 162
 163 #ifdef CONFIG_KVM_BOOK3S_HANDLER
 164 #ifdef CONFIG_KVM_BOOK3S_PR
 165         /* We use this to store guest state in */
 166         struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
 167 #endif
 168         struct kvmppc_host_state kvm_hstate;
 169 #endif
 170 };
 171
 172 extern struct paca_struct *paca;
 173 extern void initialise_paca(struct paca_struct *new_paca, int cpu);
 174 extern void setup_paca(struct paca_struct *new_paca);
 175 extern void allocate_pacas(void);
 176 extern void free_unused_pacas(void);
 177
 178 #else /* CONFIG_PPC64 */
 179
 180 static inline void allocate_pacas(void) { };
 181 static inline void free_unused_pacas(void) { };
 182
 183 #endif /* CONFIG_PPC64 */
 184
 185 #endif /* __KERNEL__ */
 186 #endif /* _ASM_POWERPC_PACA_H */