1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * This control block defines the PACA which defines the processor 4 * specific data for each logical processor on the system. 5 * There are some pointers defined that are utilized by PLIC. 6 * 7 * C 2001 PPC 64 Team, IBM Corp 8 */ 9 #ifndef _ASM_POWERPC_PACA_H 10 #define _ASM_POWERPC_PACA_H 11 #ifdef __KERNEL__ 12 13 #ifdef CONFIG_PPC64 14 15 #include <linux/string.h> 16 #include <asm/types.h> 17 #include <asm/lppaca.h> 18 #include <asm/mmu.h> 19 #include <asm/page.h> 20 #ifdef CONFIG_PPC_BOOK3E 21 #include <asm/exception-64e.h> 22 #else 23 #include <asm/exception-64s.h> 24 #endif 25 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER 26 #include <asm/kvm_book3s_asm.h> 27 #endif 28 #include <asm/accounting.h> 29 #include <asm/hmi.h> 30 #include <asm/cpuidle.h> 31 #include <asm/atomic.h> 32 #include <asm/rtas-types.h> 33 34 #include <asm-generic/mmiowb_types.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 #ifdef CONFIG_PPC_PSERIES 50 #define get_lppaca() (get_paca()->lppaca_ptr) 51 #endif 52 53 #define get_slb_shadow() (get_paca()->slb_shadow_ptr) 54 55 struct task_struct; 56 57 /* 58 * Defines the layout of the paca. 59 * 60 * This structure is not directly accessed by firmware or the service 61 * processor. 62 */ 63 struct paca_struct { 64 #ifdef CONFIG_PPC_PSERIES 65 /* 66 * Because hw_cpu_id, unlike other paca fields, is accessed 67 * routinely from other CPUs (from the IRQ code), we stick to 68 * read-only (after boot) fields in the first cacheline to 69 * avoid cacheline bouncing. 70 */ 71 72 struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */ 73 #endif /* CONFIG_PPC_PSERIES */ 74 75 /* 76 * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c 77 * load lock_token and paca_index with a single lwz 78 * instruction. They must travel together and be properly 79 * aligned. 80 */ 81 #ifdef __BIG_ENDIAN__ 82 u16 lock_token; /* Constant 0x8000, used in locks */ 83 u16 paca_index; /* Logical processor number */ 84 #else 85 u16 paca_index; /* Logical processor number */ 86 u16 lock_token; /* Constant 0x8000, used in locks */ 87 #endif 88 89 u64 kernel_toc; /* Kernel TOC address */ 90 u64 kernelbase; /* Base address of kernel */ 91 u64 kernel_msr; /* MSR while running in kernel */ 92 void *emergency_sp; /* pointer to emergency stack */ 93 u64 data_offset; /* per cpu data offset */ 94 s16 hw_cpu_id; /* Physical processor number */ 95 u8 cpu_start; /* At startup, processor spins until */ 96 /* this becomes non-zero. */ 97 u8 kexec_state; /* set when kexec down has irqs off */ 98 #ifdef CONFIG_PPC_BOOK3S_64 99 struct slb_shadow *slb_shadow_ptr; 100 struct dtl_entry *dispatch_log; 101 struct dtl_entry *dispatch_log_end; 102 #endif 103 u64 dscr_default; /* per-CPU default DSCR */ 104 105 #ifdef CONFIG_PPC_BOOK3S_64 106 /* 107 * Now, starting in cacheline 2, the exception save areas 108 */ 109 /* used for most interrupts/exceptions */ 110 u64 exgen[EX_SIZE] __attribute__((aligned(0x80))); 111 u64 exslb[EX_SIZE]; /* used for SLB/segment table misses 112 * on the linear mapping */ 113 /* SLB related definitions */ 114 u16 vmalloc_sllp; 115 u8 slb_cache_ptr; 116 u8 stab_rr; /* stab/slb round-robin counter */ 117 #ifdef CONFIG_DEBUG_VM 118 u8 in_kernel_slb_handler; 119 #endif 120 u32 slb_used_bitmap; /* Bitmaps for first 32 SLB entries. */ 121 u32 slb_kern_bitmap; 122 u32 slb_cache[SLB_CACHE_ENTRIES]; 123 #endif /* CONFIG_PPC_BOOK3S_64 */ 124 125 #ifdef CONFIG_PPC_BOOK3E 126 u64 exgen[8] __aligned(0x40); 127 /* Keep pgd in the same cacheline as the start of extlb */ 128 pgd_t *pgd __aligned(0x40); /* Current PGD */ 129 pgd_t *kernel_pgd; /* Kernel PGD */ 130 131 /* Shared by all threads of a core -- points to tcd of first thread */ 132 struct tlb_core_data *tcd_ptr; 133 134 /* 135 * We can have up to 3 levels of reentrancy in the TLB miss handler, 136 * in each of four exception levels (normal, crit, mcheck, debug). 137 */ 138 u64 extlb[12][EX_TLB_SIZE / sizeof(u64)]; 139 u64 exmc[8]; /* used for machine checks */ 140 u64 excrit[8]; /* used for crit interrupts */ 141 u64 exdbg[8]; /* used for debug interrupts */ 142 143 /* Kernel stack pointers for use by special exceptions */ 144 void *mc_kstack; 145 void *crit_kstack; 146 void *dbg_kstack; 147 148 struct tlb_core_data tcd; 149 #endif /* CONFIG_PPC_BOOK3E */ 150 151 #ifdef CONFIG_PPC_BOOK3S 152 mm_context_id_t mm_ctx_id; 153 #ifdef CONFIG_PPC_MM_SLICES 154 unsigned char mm_ctx_low_slices_psize[BITS_PER_LONG / BITS_PER_BYTE]; 155 unsigned char mm_ctx_high_slices_psize[SLICE_ARRAY_SIZE]; 156 unsigned long mm_ctx_slb_addr_limit; 157 #else 158 u16 mm_ctx_user_psize; 159 u16 mm_ctx_sllp; 160 #endif 161 #endif 162 163 /* 164 * then miscellaneous read-write fields 165 */ 166 struct task_struct *__current; /* Pointer to current */ 167 u64 kstack; /* Saved Kernel stack addr */ 168 u64 saved_r1; /* r1 save for RTAS calls or PM or EE=0 */ 169 u64 saved_msr; /* MSR saved here by enter_rtas */ 170 #ifdef CONFIG_PPC_BOOK3E 171 u16 trap_save; /* Used when bad stack is encountered */ 172 #endif 173 u8 irq_soft_mask; /* mask for irq soft masking */ 174 u8 irq_happened; /* irq happened while soft-disabled */ 175 u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */ 176 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE 177 u8 pmcregs_in_use; /* pseries puts this in lppaca */ 178 #endif 179 u64 sprg_vdso; /* Saved user-visible sprg */ 180 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 181 u64 tm_scratch; /* TM scratch area for reclaim */ 182 #endif 183 184 #ifdef CONFIG_PPC_POWERNV 185 /* PowerNV idle fields */ 186 /* PNV_CORE_IDLE_* bits, all siblings work on thread 0 paca */ 187 unsigned long idle_state; 188 union { 189 /* P7/P8 specific fields */ 190 struct { 191 /* PNV_THREAD_RUNNING/NAP/SLEEP */ 192 u8 thread_idle_state; 193 /* Mask to denote subcore sibling threads */ 194 u8 subcore_sibling_mask; 195 }; 196 197 /* P9 specific fields */ 198 struct { 199 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE 200 /* The PSSCR value that the kernel requested before going to stop */ 201 u64 requested_psscr; 202 /* Flag to request this thread not to stop */ 203 atomic_t dont_stop; 204 #endif 205 }; 206 }; 207 #endif 208 209 #ifdef CONFIG_PPC_BOOK3S_64 210 /* Non-maskable exceptions that are not performance critical */ 211 u64 exnmi[EX_SIZE]; /* used for system reset (nmi) */ 212 u64 exmc[EX_SIZE]; /* used for machine checks */ 213 #endif 214 #ifdef CONFIG_PPC_BOOK3S_64 215 /* Exclusive stacks for system reset and machine check exception. */ 216 void *nmi_emergency_sp; 217 void *mc_emergency_sp; 218 219 u16 in_nmi; /* In nmi handler */ 220 221 /* 222 * Flag to check whether we are in machine check early handler 223 * and already using emergency stack. 224 */ 225 u16 in_mce; 226 u8 hmi_event_available; /* HMI event is available */ 227 u8 hmi_p9_special_emu; /* HMI P9 special emulation */ 228 #endif 229 u8 ftrace_enabled; /* Hard disable ftrace */ 230 231 /* Stuff for accurate time accounting */ 232 struct cpu_accounting_data accounting; 233 u64 dtl_ridx; /* read index in dispatch log */ 234 struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */ 235 236 #ifdef CONFIG_KVM_BOOK3S_HANDLER 237 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE 238 /* We use this to store guest state in */ 239 struct kvmppc_book3s_shadow_vcpu shadow_vcpu; 240 #endif 241 struct kvmppc_host_state kvm_hstate; 242 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE 243 /* 244 * Bitmap for sibling subcore status. See kvm/book3s_hv_ras.c for 245 * more details 246 */ 247 struct sibling_subcore_state *sibling_subcore_state; 248 #endif 249 #endif 250 #ifdef CONFIG_PPC_BOOK3S_64 251 /* 252 * rfi fallback flush must be in its own cacheline to prevent 253 * other paca data leaking into the L1d 254 */ 255 u64 exrfi[EX_SIZE] __aligned(0x80); 256 void *rfi_flush_fallback_area; 257 u64 l1d_flush_size; 258 #endif 259 #ifdef CONFIG_PPC_PSERIES 260 struct rtas_args *rtas_args_reentrant; 261 u8 *mce_data_buf; /* buffer to hold per cpu rtas errlog */ 262 #endif /* CONFIG_PPC_PSERIES */ 263 264 #ifdef CONFIG_PPC_BOOK3S_64 265 /* Capture SLB related old contents in MCE handler. */ 266 struct slb_entry *mce_faulty_slbs; 267 u16 slb_save_cache_ptr; 268 #endif /* CONFIG_PPC_BOOK3S_64 */ 269 #ifdef CONFIG_STACKPROTECTOR 270 unsigned long canary; 271 #endif 272 #ifdef CONFIG_MMIOWB 273 struct mmiowb_state mmiowb_state; 274 #endif 275 } ____cacheline_aligned; 276 277 extern void copy_mm_to_paca(struct mm_struct *mm); 278 extern struct paca_struct **paca_ptrs; 279 extern void initialise_paca(struct paca_struct *new_paca, int cpu); 280 extern void setup_paca(struct paca_struct *new_paca); 281 extern void allocate_paca_ptrs(void); 282 extern void allocate_paca(int cpu); 283 extern void free_unused_pacas(void); 284 285 #else /* CONFIG_PPC64 */ 286 287 static inline void allocate_paca_ptrs(void) { }; 288 static inline void allocate_paca(int cpu) { }; 289 static inline void free_unused_pacas(void) { }; 290 291 #endif /* CONFIG_PPC64 */ 292 293 #endif /* __KERNEL__ */ 294 #endif /* _ASM_POWERPC_PACA_H */ 295