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/string.h>
  20 #include <asm/types.h>
  21 #include <asm/lppaca.h>
  22 #include <asm/mmu.h>
  23 #include <asm/page.h>
  24 #ifdef CONFIG_PPC_BOOK3E
  25 #include <asm/exception-64e.h>
  26 #else
  27 #include <asm/exception-64s.h>
  28 #endif
  29 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
  30 #include <asm/kvm_book3s_asm.h>
  31 #endif
  32 #include <asm/accounting.h>
  33 #include <asm/hmi.h>
  34 #include <asm/cpuidle.h>
  35
  36 register struct paca_struct *local_paca asm("r13");
  37
  38 #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
  39 extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
  40 /*
  41  * Add standard checks that preemption cannot occur when using get_paca():
  42  * otherwise the paca_struct it points to may be the wrong one just after.
  43  */
  44 #define get_paca()      ((void) debug_smp_processor_id(), local_paca)
  45 #else
  46 #define get_paca()      local_paca
  47 #endif
  48
  49 #define get_lppaca()    (get_paca()->lppaca_ptr)
  50 #define get_slb_shadow()        (get_paca()->slb_shadow_ptr)
  51
  52 struct task_struct;
  53
  54 /*
  55  * Defines the layout of the paca.
  56  *
  57  * This structure is not directly accessed by firmware or the service
  58  * processor.
  59  */
  60 struct paca_struct {
  61 #ifdef CONFIG_PPC_BOOK3S
  62         /*
  63          * Because hw_cpu_id, unlike other paca fields, is accessed
  64          * routinely from other CPUs (from the IRQ code), we stick to
  65          * read-only (after boot) fields in the first cacheline to
  66          * avoid cacheline bouncing.
  67          */
  68
  69         struct lppaca *lppaca_ptr;      /* Pointer to LpPaca for PLIC */
  70 #endif /* CONFIG_PPC_BOOK3S */
  71         /*
  72          * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c
  73          * load lock_token and paca_index with a single lwz
  74          * instruction.  They must travel together and be properly
  75          * aligned.
  76          */
  77 #ifdef __BIG_ENDIAN__
  78         u16 lock_token;                 /* Constant 0x8000, used in locks */
  79         u16 paca_index;                 /* Logical processor number */
  80 #else
  81         u16 paca_index;                 /* Logical processor number */
  82         u16 lock_token;                 /* Constant 0x8000, used in locks */
  83 #endif
  84
  85         u64 kernel_toc;                 /* Kernel TOC address */
  86         u64 kernelbase;                 /* Base address of kernel */
  87         u64 kernel_msr;                 /* MSR while running in kernel */
  88         void *emergency_sp;             /* pointer to emergency stack */
  89         u64 data_offset;                /* per cpu data offset */
  90         s16 hw_cpu_id;                  /* Physical processor number */
  91         u8 cpu_start;                   /* At startup, processor spins until */
  92                                         /* this becomes non-zero. */
  93         u8 kexec_state;         /* set when kexec down has irqs off */
  94 #ifdef CONFIG_PPC_BOOK3S_64
  95         struct slb_shadow *slb_shadow_ptr;
  96         struct dtl_entry *dispatch_log;
  97         struct dtl_entry *dispatch_log_end;
  98 #endif
  99         u64 dscr_default;               /* per-CPU default DSCR */
 100
 101 #ifdef CONFIG_PPC_BOOK3S_64
 102         /*
 103          * Now, starting in cacheline 2, the exception save areas
 104          */
 105         /* used for most interrupts/exceptions */
 106         u64 exgen[EX_SIZE] __attribute__((aligned(0x80)));
 107         u64 exslb[EX_SIZE];     /* used for SLB/segment table misses
 108                                  * on the linear mapping */
 109         /* SLB related definitions */
 110         u16 vmalloc_sllp;
 111         u16 slb_cache_ptr;
 112         u32 slb_cache[SLB_CACHE_ENTRIES];
 113 #endif /* CONFIG_PPC_BOOK3S_64 */
 114
 115 #ifdef CONFIG_PPC_BOOK3E
 116         u64 exgen[8] __aligned(0x40);
 117         /* Keep pgd in the same cacheline as the start of extlb */
 118         pgd_t *pgd __aligned(0x40); /* Current PGD */
 119         pgd_t *kernel_pgd;              /* Kernel PGD */
 120
 121         /* Shared by all threads of a core -- points to tcd of first thread */
 122         struct tlb_core_data *tcd_ptr;
 123
 124         /*
 125          * We can have up to 3 levels of reentrancy in the TLB miss handler,
 126          * in each of four exception levels (normal, crit, mcheck, debug).
 127          */
 128         u64 extlb[12][EX_TLB_SIZE / sizeof(u64)];
 129         u64 exmc[8];            /* used for machine checks */
 130         u64 excrit[8];          /* used for crit interrupts */
 131         u64 exdbg[8];           /* used for debug interrupts */
 132
 133         /* Kernel stack pointers for use by special exceptions */
 134         void *mc_kstack;
 135         void *crit_kstack;
 136         void *dbg_kstack;
 137
 138         struct tlb_core_data tcd;
 139 #endif /* CONFIG_PPC_BOOK3E */
 140
 141 #ifdef CONFIG_PPC_BOOK3S
 142         mm_context_id_t mm_ctx_id;
 143 #ifdef CONFIG_PPC_MM_SLICES
 144         u64 mm_ctx_low_slices_psize;
 145         unsigned char mm_ctx_high_slices_psize[SLICE_ARRAY_SIZE];
 146         unsigned long mm_ctx_slb_addr_limit;
 147 #else
 148         u16 mm_ctx_user_psize;
 149         u16 mm_ctx_sllp;
 150 #endif
 151 #endif
 152
 153         /*
 154          * then miscellaneous read-write fields
 155          */
 156         struct task_struct *__current;  /* Pointer to current */
 157         u64 kstack;                     /* Saved Kernel stack addr */
 158         u64 stab_rr;                    /* stab/slb round-robin counter */
 159         u64 saved_r1;                   /* r1 save for RTAS calls or PM */
 160         u64 saved_msr;                  /* MSR saved here by enter_rtas */
 161         u16 trap_save;                  /* Used when bad stack is encountered */
 162         u8 irq_soft_mask;               /* mask for irq soft masking */
 163         u8 irq_happened;                /* irq happened while soft-disabled */
 164         u8 io_sync;                     /* writel() needs spin_unlock sync */
 165         u8 irq_work_pending;            /* IRQ_WORK interrupt while soft-disable */
 166         u8 nap_state_lost;              /* NV GPR values lost in power7_idle */
 167         u64 sprg_vdso;                  /* Saved user-visible sprg */
 168 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 169         u64 tm_scratch;                 /* TM scratch area for reclaim */
 170 #endif
 171
 172 #ifdef CONFIG_PPC_POWERNV
 173         /* Per-core mask tracking idle threads and a lock bit-[L][TTTTTTTT] */
 174         u32 *core_idle_state_ptr;
 175         u8 thread_idle_state;           /* PNV_THREAD_RUNNING/NAP/SLEEP */
 176         /* Mask to indicate thread id in core */
 177         u8 thread_mask;
 178         /* Mask to denote subcore sibling threads */
 179         u8 subcore_sibling_mask;
 180         /*
 181          * Pointer to an array which contains pointer
 182          * to the sibling threads' paca.
 183          */
 184         struct paca_struct **thread_sibling_pacas;
 185         /* The PSSCR value that the kernel requested before going to stop */
 186         u64 requested_psscr;
 187
 188         /*
 189          * Save area for additional SPRs that need to be
 190          * saved/restored during cpuidle stop.
 191          */
 192         struct stop_sprs stop_sprs;
 193 #endif
 194
 195 #ifdef CONFIG_PPC_BOOK3S_64
 196         /* Non-maskable exceptions that are not performance critical */
 197         u64 exnmi[EX_SIZE];     /* used for system reset (nmi) */
 198         u64 exmc[EX_SIZE];      /* used for machine checks */
 199 #endif
 200 #ifdef CONFIG_PPC_BOOK3S_64
 201         /* Exclusive stacks for system reset and machine check exception. */
 202         void *nmi_emergency_sp;
 203         void *mc_emergency_sp;
 204
 205         u16 in_nmi;                     /* In nmi handler */
 206
 207         /*
 208          * Flag to check whether we are in machine check early handler
 209          * and already using emergency stack.
 210          */
 211         u16 in_mce;
 212         u8 hmi_event_available;         /* HMI event is available */
 213         u8 hmi_p9_special_emu;          /* HMI P9 special emulation */
 214 #endif
 215
 216         /* Stuff for accurate time accounting */
 217         struct cpu_accounting_data accounting;
 218         u64 dtl_ridx;                   /* read index in dispatch log */
 219         struct dtl_entry *dtl_curr;     /* pointer corresponding to dtl_ridx */
 220
 221 #ifdef CONFIG_KVM_BOOK3S_HANDLER
 222 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
 223         /* We use this to store guest state in */
 224         struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
 225 #endif
 226         struct kvmppc_host_state kvm_hstate;
 227 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
 228         /*
 229          * Bitmap for sibling subcore status. See kvm/book3s_hv_ras.c for
 230          * more details
 231          */
 232         struct sibling_subcore_state *sibling_subcore_state;
 233 #endif
 234 #endif
 235 #ifdef CONFIG_PPC_BOOK3S_64
 236         /*
 237          * rfi fallback flush must be in its own cacheline to prevent
 238          * other paca data leaking into the L1d
 239          */
 240         u64 exrfi[EX_SIZE] __aligned(0x80);
 241         void *rfi_flush_fallback_area;
 242         u64 l1d_flush_size;
 243 #endif
 244 };
 245
 246 extern void copy_mm_to_paca(struct mm_struct *mm);
 247 extern struct paca_struct *paca;
 248 extern void initialise_paca(struct paca_struct *new_paca, int cpu);
 249 extern void setup_paca(struct paca_struct *new_paca);
 250 extern void allocate_pacas(void);
 251 extern void free_unused_pacas(void);
 252
 253 #else /* CONFIG_PPC64 */
 254
 255 static inline void allocate_pacas(void) { };
 256 static inline void free_unused_pacas(void) { };
 257
 258 #endif /* CONFIG_PPC64 */
 259
 260 #endif /* __KERNEL__ */
 261 #endif /* _ASM_POWERPC_PACA_H */