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 <asm/types.h>
  20 #include <asm/lppaca.h>
  21 #include <asm/mmu.h>
  22 #include <asm/page.h>
  23 #include <asm/exception-64e.h>
  24 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
  25 #include <asm/kvm_book3s_asm.h>
  26 #endif
  27
  28 register struct paca_struct *local_paca asm("r13");
  29
  30 #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
  31 extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
  32 /*
  33  * Add standard checks that preemption cannot occur when using get_paca():
  34  * otherwise the paca_struct it points to may be the wrong one just after.
  35  */
  36 #define get_paca()      ((void) debug_smp_processor_id(), local_paca)
  37 #else
  38 #define get_paca()      local_paca
  39 #endif
  40
  41 #define get_lppaca()    (get_paca()->lppaca_ptr)
  42 #define get_slb_shadow()        (get_paca()->slb_shadow_ptr)
  43
  44 struct task_struct;
  45
  46 /*
  47  * Defines the layout of the paca.
  48  *
  49  * This structure is not directly accessed by firmware or the service
  50  * processor.
  51  */
  52 struct paca_struct {
  53 #ifdef CONFIG_PPC_BOOK3S
  54         /*
  55          * Because hw_cpu_id, unlike other paca fields, is accessed
  56          * routinely from other CPUs (from the IRQ code), we stick to
  57          * read-only (after boot) fields in the first cacheline to
  58          * avoid cacheline bouncing.
  59          */
  60
  61         struct lppaca *lppaca_ptr;      /* Pointer to LpPaca for PLIC */
  62 #endif /* CONFIG_PPC_BOOK3S */
  63         /*
  64          * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c
  65          * load lock_token and paca_index with a single lwz
  66          * instruction.  They must travel together and be properly
  67          * aligned.
  68          */
  69 #ifdef __BIG_ENDIAN__
  70         u16 lock_token;                 /* Constant 0x8000, used in locks */
  71         u16 paca_index;                 /* Logical processor number */
  72 #else
  73         u16 paca_index;                 /* Logical processor number */
  74         u16 lock_token;                 /* Constant 0x8000, used in locks */
  75 #endif
  76
  77         u64 kernel_toc;                 /* Kernel TOC address */
  78         u64 kernelbase;                 /* Base address of kernel */
  79         u64 kernel_msr;                 /* MSR while running in kernel */
  80         void *emergency_sp;             /* pointer to emergency stack */
  81         u64 data_offset;                /* per cpu data offset */
  82         s16 hw_cpu_id;                  /* Physical processor number */
  83         u8 cpu_start;                   /* At startup, processor spins until */
  84                                         /* this becomes non-zero. */
  85         u8 kexec_state;         /* set when kexec down has irqs off */
  86 #ifdef CONFIG_PPC_STD_MMU_64
  87         struct slb_shadow *slb_shadow_ptr;
  88         struct dtl_entry *dispatch_log;
  89         struct dtl_entry *dispatch_log_end;
  90 #endif /* CONFIG_PPC_STD_MMU_64 */
  91         u64 dscr_default;               /* per-CPU default DSCR */
  92
  93 #ifdef CONFIG_PPC_STD_MMU_64
  94         /*
  95          * Now, starting in cacheline 2, the exception save areas
  96          */
  97         /* used for most interrupts/exceptions */
  98         u64 exgen[13] __attribute__((aligned(0x80)));
  99         u64 exmc[13];           /* used for machine checks */
 100         u64 exslb[13];          /* used for SLB/segment table misses
 101                                  * on the linear mapping */
 102         /* SLB related definitions */
 103         u16 vmalloc_sllp;
 104         u16 slb_cache_ptr;
 105         u32 slb_cache[SLB_CACHE_ENTRIES];
 106 #endif /* CONFIG_PPC_STD_MMU_64 */
 107
 108 #ifdef CONFIG_PPC_BOOK3E
 109         u64 exgen[8] __aligned(0x40);
 110         /* Keep pgd in the same cacheline as the start of extlb */
 111         pgd_t *pgd __aligned(0x40); /* Current PGD */
 112         pgd_t *kernel_pgd;              /* Kernel PGD */
 113
 114         /* Shared by all threads of a core -- points to tcd of first thread */
 115         struct tlb_core_data *tcd_ptr;
 116
 117         /*
 118          * We can have up to 3 levels of reentrancy in the TLB miss handler,
 119          * in each of four exception levels (normal, crit, mcheck, debug).
 120          */
 121         u64 extlb[12][EX_TLB_SIZE / sizeof(u64)];
 122         u64 exmc[8];            /* used for machine checks */
 123         u64 excrit[8];          /* used for crit interrupts */
 124         u64 exdbg[8];           /* used for debug interrupts */
 125
 126         /* Kernel stack pointers for use by special exceptions */
 127         void *mc_kstack;
 128         void *crit_kstack;
 129         void *dbg_kstack;
 130
 131         struct tlb_core_data tcd;
 132 #endif /* CONFIG_PPC_BOOK3E */
 133
 134         mm_context_t context;
 135
 136         /*
 137          * then miscellaneous read-write fields
 138          */
 139         struct task_struct *__current;  /* Pointer to current */
 140         u64 kstack;                     /* Saved Kernel stack addr */
 141         u64 stab_rr;                    /* stab/slb round-robin counter */
 142         u64 saved_r1;                   /* r1 save for RTAS calls or PM */
 143         u64 saved_msr;                  /* MSR saved here by enter_rtas */
 144         u16 trap_save;                  /* Used when bad stack is encountered */
 145         u8 soft_enabled;                /* irq soft-enable flag */
 146         u8 irq_happened;                /* irq happened while soft-disabled */
 147         u8 io_sync;                     /* writel() needs spin_unlock sync */
 148         u8 irq_work_pending;            /* IRQ_WORK interrupt while soft-disable */
 149         u8 nap_state_lost;              /* NV GPR values lost in power7_idle */
 150         u64 sprg_vdso;                  /* Saved user-visible sprg */
 151 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 152         u64 tm_scratch;                 /* TM scratch area for reclaim */
 153 #endif
 154
 155 #ifdef CONFIG_PPC_POWERNV
 156         /* Per-core mask tracking idle threads and a lock bit-[L][TTTTTTTT] */
 157         u32 *core_idle_state_ptr;
 158         u8 thread_idle_state;           /* PNV_THREAD_RUNNING/NAP/SLEEP */
 159         /* Mask to indicate thread id in core */
 160         u8 thread_mask;
 161         /* Mask to denote subcore sibling threads */
 162         u8 subcore_sibling_mask;
 163 #endif
 164
 165 #ifdef CONFIG_PPC_BOOK3S_64
 166         /* Exclusive emergency stack pointer for machine check exception. */
 167         void *mc_emergency_sp;
 168         /*
 169          * Flag to check whether we are in machine check early handler
 170          * and already using emergency stack.
 171          */
 172         u16 in_mce;
 173         u8 hmi_event_available;          /* HMI event is available */
 174 #endif
 175
 176         /* Stuff for accurate time accounting */
 177         u64 user_time;                  /* accumulated usermode TB ticks */
 178         u64 system_time;                /* accumulated system TB ticks */
 179         u64 user_time_scaled;           /* accumulated usermode SPURR ticks */
 180         u64 starttime;                  /* TB value snapshot */
 181         u64 starttime_user;             /* TB value on exit to usermode */
 182         u64 startspurr;                 /* SPURR value snapshot */
 183         u64 utime_sspurr;               /* ->user_time when ->startspurr set */
 184         u64 stolen_time;                /* TB ticks taken by hypervisor */
 185         u64 dtl_ridx;                   /* read index in dispatch log */
 186         struct dtl_entry *dtl_curr;     /* pointer corresponding to dtl_ridx */
 187
 188 #ifdef CONFIG_KVM_BOOK3S_HANDLER
 189 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
 190         /* We use this to store guest state in */
 191         struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
 192 #endif
 193         struct kvmppc_host_state kvm_hstate;
 194 #endif
 195 };
 196
 197 extern struct paca_struct *paca;
 198 extern void initialise_paca(struct paca_struct *new_paca, int cpu);
 199 extern void setup_paca(struct paca_struct *new_paca);
 200 extern void allocate_pacas(void);
 201 extern void free_unused_pacas(void);
 202
 203 #else /* CONFIG_PPC64 */
 204
 205 static inline void allocate_pacas(void) { };
 206 static inline void free_unused_pacas(void) { };
 207
 208 #endif /* CONFIG_PPC64 */
 209
 210 #endif /* __KERNEL__ */
 211 #endif /* _ASM_POWERPC_PACA_H */