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 struct opal_machine_check_event;
  46
  47 /*
  48  * Defines the layout of the paca.
  49  *
  50  * This structure is not directly accessed by firmware or the service
  51  * processor.
  52  */
  53 struct paca_struct {
  54 #ifdef CONFIG_PPC_BOOK3S
  55         /*
  56          * Because hw_cpu_id, unlike other paca fields, is accessed
  57          * routinely from other CPUs (from the IRQ code), we stick to
  58          * read-only (after boot) fields in the first cacheline to
  59          * avoid cacheline bouncing.
  60          */
  61
  62         struct lppaca *lppaca_ptr;      /* Pointer to LpPaca for PLIC */
  63 #endif /* CONFIG_PPC_BOOK3S */
  64         /*
  65          * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c
  66          * load lock_token and paca_index with a single lwz
  67          * instruction.  They must travel together and be properly
  68          * aligned.
  69          */
  70 #ifdef __BIG_ENDIAN__
  71         u16 lock_token;                 /* Constant 0x8000, used in locks */
  72         u16 paca_index;                 /* Logical processor number */
  73 #else
  74         u16 paca_index;                 /* Logical processor number */
  75         u16 lock_token;                 /* Constant 0x8000, used in locks */
  76 #endif
  77
  78         u64 kernel_toc;                 /* Kernel TOC address */
  79         u64 kernelbase;                 /* Base address of kernel */
  80         u64 kernel_msr;                 /* MSR while running in kernel */
  81 #ifdef CONFIG_PPC_STD_MMU_64
  82         u64 stab_real;                  /* Absolute address of segment table */
  83         u64 stab_addr;                  /* Virtual address of segment table */
  84 #endif /* CONFIG_PPC_STD_MMU_64 */
  85         void *emergency_sp;             /* pointer to emergency stack */
  86         u64 data_offset;                /* per cpu data offset */
  87         s16 hw_cpu_id;                  /* Physical processor number */
  88         u8 cpu_start;                   /* At startup, processor spins until */
  89                                         /* this becomes non-zero. */
  90         u8 kexec_state;         /* set when kexec down has irqs off */
  91 #ifdef CONFIG_PPC_STD_MMU_64
  92         struct slb_shadow *slb_shadow_ptr;
  93         struct dtl_entry *dispatch_log;
  94         struct dtl_entry *dispatch_log_end;
  95
  96         /*
  97          * Now, starting in cacheline 2, the exception save areas
  98          */
  99         /* used for most interrupts/exceptions */
 100         u64 exgen[13] __attribute__((aligned(0x80)));
 101         u64 exmc[13];           /* used for machine checks */
 102         u64 exslb[13];          /* used for SLB/segment table misses
 103                                  * on the linear mapping */
 104         /* SLB related definitions */
 105         u16 vmalloc_sllp;
 106         u16 slb_cache_ptr;
 107         u32 slb_cache[SLB_CACHE_ENTRIES];
 108 #endif /* CONFIG_PPC_STD_MMU_64 */
 109
 110 #ifdef CONFIG_PPC_BOOK3E
 111         u64 exgen[8] __attribute__((aligned(0x80)));
 112         /* Keep pgd in the same cacheline as the start of extlb */
 113         pgd_t *pgd __attribute__((aligned(0x80))); /* Current PGD */
 114         pgd_t *kernel_pgd;              /* Kernel PGD */
 115
 116         /* Shared by all threads of a core -- points to tcd of first thread */
 117         struct tlb_core_data *tcd_ptr;
 118
 119         /* We can have up to 3 levels of reentrancy in the TLB miss handler */
 120         u64 extlb[3][EX_TLB_SIZE / sizeof(u64)];
 121         u64 exmc[8];            /* used for machine checks */
 122         u64 excrit[8];          /* used for crit interrupts */
 123         u64 exdbg[8];           /* used for debug interrupts */
 124
 125         /* Kernel stack pointers for use by special exceptions */
 126         void *mc_kstack;
 127         void *crit_kstack;
 128         void *dbg_kstack;
 129
 130         struct tlb_core_data tcd;
 131 #endif /* CONFIG_PPC_BOOK3E */
 132
 133         mm_context_t context;
 134
 135         /*
 136          * then miscellaneous read-write fields
 137          */
 138         struct task_struct *__current;  /* Pointer to current */
 139         u64 kstack;                     /* Saved Kernel stack addr */
 140         u64 stab_rr;                    /* stab/slb round-robin counter */
 141         u64 saved_r1;                   /* r1 save for RTAS calls or PM */
 142         u64 saved_msr;                  /* MSR saved here by enter_rtas */
 143         u16 trap_save;                  /* Used when bad stack is encountered */
 144         u8 soft_enabled;                /* irq soft-enable flag */
 145         u8 irq_happened;                /* irq happened while soft-disabled */
 146         u8 io_sync;                     /* writel() needs spin_unlock sync */
 147         u8 irq_work_pending;            /* IRQ_WORK interrupt while soft-disable */
 148         u8 nap_state_lost;              /* NV GPR values lost in power7_idle */
 149         u64 sprg3;                      /* Saved user-visible sprg */
 150 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 151         u64 tm_scratch;                 /* TM scratch area for reclaim */
 152 #endif
 153
 154 #ifdef CONFIG_PPC_POWERNV
 155         /* Pointer to OPAL machine check event structure set by the
 156          * early exception handler for use by high level C handler
 157          */
 158         struct opal_machine_check_event *opal_mc_evt;
 159 #endif
 160 #ifdef CONFIG_PPC_BOOK3S_64
 161         /* Exclusive emergency stack pointer for machine check exception. */
 162         void *mc_emergency_sp;
 163         /*
 164          * Flag to check whether we are in machine check early handler
 165          * and already using emergency stack.
 166          */
 167         u16 in_mce;
 168 #endif
 169
 170         /* Stuff for accurate time accounting */
 171         u64 user_time;                  /* accumulated usermode TB ticks */
 172         u64 system_time;                /* accumulated system TB ticks */
 173         u64 user_time_scaled;           /* accumulated usermode SPURR ticks */
 174         u64 starttime;                  /* TB value snapshot */
 175         u64 starttime_user;             /* TB value on exit to usermode */
 176         u64 startspurr;                 /* SPURR value snapshot */
 177         u64 utime_sspurr;               /* ->user_time when ->startspurr set */
 178         u64 stolen_time;                /* TB ticks taken by hypervisor */
 179         u64 dtl_ridx;                   /* read index in dispatch log */
 180         struct dtl_entry *dtl_curr;     /* pointer corresponding to dtl_ridx */
 181
 182 #ifdef CONFIG_KVM_BOOK3S_HANDLER
 183 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
 184         /* We use this to store guest state in */
 185         struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
 186 #endif
 187         struct kvmppc_host_state kvm_hstate;
 188 #endif
 189 };
 190
 191 extern struct paca_struct *paca;
 192 extern void initialise_paca(struct paca_struct *new_paca, int cpu);
 193 extern void setup_paca(struct paca_struct *new_paca);
 194 extern void allocate_pacas(void);
 195 extern void free_unused_pacas(void);
 196
 197 #else /* CONFIG_PPC64 */
 198
 199 static inline void allocate_pacas(void) { };
 200 static inline void free_unused_pacas(void) { };
 201
 202 #endif /* CONFIG_PPC64 */
 203
 204 #endif /* __KERNEL__ */
 205 #endif /* _ASM_POWERPC_PACA_H */