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_STD_MMU_64 95 struct slb_shadow *slb_shadow_ptr; 96 struct dtl_entry *dispatch_log; 97 struct dtl_entry *dispatch_log_end; 98 #endif /* CONFIG_PPC_STD_MMU_64 */ 99 u64 dscr_default; /* per-CPU default DSCR */ 100 101 #ifdef CONFIG_PPC_STD_MMU_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_STD_MMU_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 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 soft_enabled; /* irq soft-enable flag */ 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_STD_MMU_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 #endif 214 215 /* Stuff for accurate time accounting */ 216 struct cpu_accounting_data accounting; 217 u64 dtl_ridx; /* read index in dispatch log */ 218 struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */ 219 220 #ifdef CONFIG_KVM_BOOK3S_HANDLER 221 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE 222 /* We use this to store guest state in */ 223 struct kvmppc_book3s_shadow_vcpu shadow_vcpu; 224 #endif 225 struct kvmppc_host_state kvm_hstate; 226 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE 227 /* 228 * Bitmap for sibling subcore status. See kvm/book3s_hv_ras.c for 229 * more details 230 */ 231 struct sibling_subcore_state *sibling_subcore_state; 232 #endif 233 #endif 234 }; 235 236 extern void copy_mm_to_paca(struct mm_struct *mm); 237 extern struct paca_struct *paca; 238 extern void initialise_paca(struct paca_struct *new_paca, int cpu); 239 extern void setup_paca(struct paca_struct *new_paca); 240 extern void allocate_pacas(void); 241 extern void free_unused_pacas(void); 242 243 #else /* CONFIG_PPC64 */ 244 245 static inline void allocate_pacas(void) { }; 246 static inline void free_unused_pacas(void) { }; 247 248 #endif /* CONFIG_PPC64 */ 249 250 #endif /* __KERNEL__ */ 251 #endif /* _ASM_POWERPC_PACA_H */ 252