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 #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 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 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 #endif /* CONFIG_PPC_STD_MMU_64 */ 92 u64 dscr_default; /* per-CPU default DSCR */ 93 94 #ifdef CONFIG_PPC_STD_MMU_64 95 /* 96 * Now, starting in cacheline 2, the exception save areas 97 */ 98 /* used for most interrupts/exceptions */ 99 u64 exgen[13] __attribute__((aligned(0x80))); 100 u64 exmc[13]; /* used for machine checks */ 101 u64 exslb[13]; /* used for SLB/segment table misses 102 * on the linear mapping */ 103 /* SLB related definitions */ 104 u16 vmalloc_sllp; 105 u16 slb_cache_ptr; 106 u32 slb_cache[SLB_CACHE_ENTRIES]; 107 #endif /* CONFIG_PPC_STD_MMU_64 */ 108 109 #ifdef CONFIG_PPC_BOOK3E 110 u64 exgen[8] __aligned(0x40); 111 /* Keep pgd in the same cacheline as the start of extlb */ 112 pgd_t *pgd __aligned(0x40); /* Current PGD */ 113 pgd_t *kernel_pgd; /* Kernel PGD */ 114 115 /* Shared by all threads of a core -- points to tcd of first thread */ 116 struct tlb_core_data *tcd_ptr; 117 118 /* 119 * We can have up to 3 levels of reentrancy in the TLB miss handler, 120 * in each of four exception levels (normal, crit, mcheck, debug). 121 */ 122 u64 extlb[12][EX_TLB_SIZE / sizeof(u64)]; 123 u64 exmc[8]; /* used for machine checks */ 124 u64 excrit[8]; /* used for crit interrupts */ 125 u64 exdbg[8]; /* used for debug interrupts */ 126 127 /* Kernel stack pointers for use by special exceptions */ 128 void *mc_kstack; 129 void *crit_kstack; 130 void *dbg_kstack; 131 132 struct tlb_core_data tcd; 133 #endif /* CONFIG_PPC_BOOK3E */ 134 135 #ifdef CONFIG_PPC_BOOK3S 136 mm_context_id_t mm_ctx_id; 137 #ifdef CONFIG_PPC_MM_SLICES 138 u64 mm_ctx_low_slices_psize; 139 unsigned char mm_ctx_high_slices_psize[SLICE_ARRAY_SIZE]; 140 #else 141 u16 mm_ctx_user_psize; 142 u16 mm_ctx_sllp; 143 #endif 144 #endif 145 146 /* 147 * then miscellaneous read-write fields 148 */ 149 struct task_struct *__current; /* Pointer to current */ 150 u64 kstack; /* Saved Kernel stack addr */ 151 u64 stab_rr; /* stab/slb round-robin counter */ 152 u64 saved_r1; /* r1 save for RTAS calls or PM */ 153 u64 saved_msr; /* MSR saved here by enter_rtas */ 154 u16 trap_save; /* Used when bad stack is encountered */ 155 u8 soft_enabled; /* irq soft-enable flag */ 156 u8 irq_happened; /* irq happened while soft-disabled */ 157 u8 io_sync; /* writel() needs spin_unlock sync */ 158 u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */ 159 u8 nap_state_lost; /* NV GPR values lost in power7_idle */ 160 u64 sprg_vdso; /* Saved user-visible sprg */ 161 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 162 u64 tm_scratch; /* TM scratch area for reclaim */ 163 #endif 164 165 #ifdef CONFIG_PPC_POWERNV 166 /* Per-core mask tracking idle threads and a lock bit-[L][TTTTTTTT] */ 167 u32 *core_idle_state_ptr; 168 u8 thread_idle_state; /* PNV_THREAD_RUNNING/NAP/SLEEP */ 169 /* Mask to indicate thread id in core */ 170 u8 thread_mask; 171 /* Mask to denote subcore sibling threads */ 172 u8 subcore_sibling_mask; 173 #endif 174 175 #ifdef CONFIG_PPC_BOOK3S_64 176 /* Exclusive emergency stack pointer for machine check exception. */ 177 void *mc_emergency_sp; 178 /* 179 * Flag to check whether we are in machine check early handler 180 * and already using emergency stack. 181 */ 182 u16 in_mce; 183 u8 hmi_event_available; /* HMI event is available */ 184 #endif 185 186 /* Stuff for accurate time accounting */ 187 u64 user_time; /* accumulated usermode TB ticks */ 188 u64 system_time; /* accumulated system TB ticks */ 189 u64 user_time_scaled; /* accumulated usermode SPURR ticks */ 190 u64 starttime; /* TB value snapshot */ 191 u64 starttime_user; /* TB value on exit to usermode */ 192 u64 startspurr; /* SPURR value snapshot */ 193 u64 utime_sspurr; /* ->user_time when ->startspurr set */ 194 u64 stolen_time; /* TB ticks taken by hypervisor */ 195 u64 dtl_ridx; /* read index in dispatch log */ 196 struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */ 197 198 #ifdef CONFIG_KVM_BOOK3S_HANDLER 199 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE 200 /* We use this to store guest state in */ 201 struct kvmppc_book3s_shadow_vcpu shadow_vcpu; 202 #endif 203 struct kvmppc_host_state kvm_hstate; 204 #endif 205 }; 206 207 #ifdef CONFIG_PPC_BOOK3S 208 static inline void copy_mm_to_paca(mm_context_t *context) 209 { 210 get_paca()->mm_ctx_id = context->id; 211 #ifdef CONFIG_PPC_MM_SLICES 212 get_paca()->mm_ctx_low_slices_psize = context->low_slices_psize; 213 memcpy(&get_paca()->mm_ctx_high_slices_psize, 214 &context->high_slices_psize, SLICE_ARRAY_SIZE); 215 #else 216 get_paca()->mm_ctx_user_psize = context->user_psize; 217 get_paca()->mm_ctx_sllp = context->sllp; 218 #endif 219 } 220 #else 221 static inline void copy_mm_to_paca(mm_context_t *context){} 222 #endif 223 224 extern struct paca_struct *paca; 225 extern void initialise_paca(struct paca_struct *new_paca, int cpu); 226 extern void setup_paca(struct paca_struct *new_paca); 227 extern void allocate_pacas(void); 228 extern void free_unused_pacas(void); 229 230 #else /* CONFIG_PPC64 */ 231 232 static inline void allocate_pacas(void) { }; 233 static inline void free_unused_pacas(void) { }; 234 235 #endif /* CONFIG_PPC64 */ 236 237 #endif /* __KERNEL__ */ 238 #endif /* _ASM_POWERPC_PACA_H */ 239