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/cache.h> 16 #include <linux/string.h> 17 #include <asm/types.h> 18 #include <asm/lppaca.h> 19 #include <asm/mmu.h> 20 #include <asm/page.h> 21 #ifdef CONFIG_PPC_BOOK3E 22 #include <asm/exception-64e.h> 23 #else 24 #include <asm/exception-64s.h> 25 #endif 26 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER 27 #include <asm/kvm_book3s_asm.h> 28 #endif 29 #include <asm/accounting.h> 30 #include <asm/hmi.h> 31 #include <asm/cpuidle.h> 32 #include <asm/atomic.h> 33 #include <asm/mce.h> 34 35 #include <asm-generic/mmiowb_types.h> 36 37 register struct paca_struct *local_paca asm("r13"); 38 39 #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP) 40 extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */ 41 /* 42 * Add standard checks that preemption cannot occur when using get_paca(): 43 * otherwise the paca_struct it points to may be the wrong one just after. 44 */ 45 #define get_paca() ((void) debug_smp_processor_id(), local_paca) 46 #else 47 #define get_paca() local_paca 48 #endif 49 50 #ifdef CONFIG_PPC_PSERIES 51 #define get_lppaca() (get_paca()->lppaca_ptr) 52 #endif 53 54 #define get_slb_shadow() (get_paca()->slb_shadow_ptr) 55 56 struct task_struct; 57 struct rtas_args; 58 59 /* 60 * Defines the layout of the paca. 61 * 62 * This structure is not directly accessed by firmware or the service 63 * processor. 64 */ 65 struct paca_struct { 66 #ifdef CONFIG_PPC_PSERIES 67 /* 68 * Because hw_cpu_id, unlike other paca fields, is accessed 69 * routinely from other CPUs (from the IRQ code), we stick to 70 * read-only (after boot) fields in the first cacheline to 71 * avoid cacheline bouncing. 72 */ 73 74 struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */ 75 #endif /* CONFIG_PPC_PSERIES */ 76 77 /* 78 * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c 79 * load lock_token and paca_index with a single lwz 80 * instruction. They must travel together and be properly 81 * aligned. 82 */ 83 #ifdef __BIG_ENDIAN__ 84 u16 lock_token; /* Constant 0x8000, used in locks */ 85 u16 paca_index; /* Logical processor number */ 86 #else 87 u16 paca_index; /* Logical processor number */ 88 u16 lock_token; /* Constant 0x8000, used in locks */ 89 #endif 90 91 u64 kernel_toc; /* Kernel TOC address */ 92 u64 kernelbase; /* Base address of kernel */ 93 u64 kernel_msr; /* MSR while running in kernel */ 94 void *emergency_sp; /* pointer to emergency stack */ 95 u64 data_offset; /* per cpu data offset */ 96 s16 hw_cpu_id; /* Physical processor number */ 97 u8 cpu_start; /* At startup, processor spins until */ 98 /* this becomes non-zero. */ 99 u8 kexec_state; /* set when kexec down has irqs off */ 100 #ifdef CONFIG_PPC_BOOK3S_64 101 #ifdef CONFIG_PPC_64S_HASH_MMU 102 struct slb_shadow *slb_shadow_ptr; 103 #endif 104 struct dtl_entry *dispatch_log; 105 struct dtl_entry *dispatch_log_end; 106 #endif 107 u64 dscr_default; /* per-CPU default DSCR */ 108 109 #ifdef CONFIG_PPC_BOOK3S_64 110 /* 111 * Now, starting in cacheline 2, the exception save areas 112 */ 113 /* used for most interrupts/exceptions */ 114 u64 exgen[EX_SIZE] __attribute__((aligned(0x80))); 115 116 #ifdef CONFIG_PPC_64S_HASH_MMU 117 /* SLB related definitions */ 118 u16 vmalloc_sllp; 119 u8 slb_cache_ptr; 120 u8 stab_rr; /* stab/slb round-robin counter */ 121 #ifdef CONFIG_DEBUG_VM 122 u8 in_kernel_slb_handler; 123 #endif 124 u32 slb_used_bitmap; /* Bitmaps for first 32 SLB entries. */ 125 u32 slb_kern_bitmap; 126 u32 slb_cache[SLB_CACHE_ENTRIES]; 127 #endif 128 #endif /* CONFIG_PPC_BOOK3S_64 */ 129 130 #ifdef CONFIG_PPC_BOOK3E 131 u64 exgen[8] __aligned(0x40); 132 /* Keep pgd in the same cacheline as the start of extlb */ 133 pgd_t *pgd __aligned(0x40); /* Current PGD */ 134 pgd_t *kernel_pgd; /* Kernel PGD */ 135 136 /* Shared by all threads of a core -- points to tcd of first thread */ 137 struct tlb_core_data *tcd_ptr; 138 139 /* 140 * We can have up to 3 levels of reentrancy in the TLB miss handler, 141 * in each of four exception levels (normal, crit, mcheck, debug). 142 */ 143 u64 extlb[12][EX_TLB_SIZE / sizeof(u64)]; 144 u64 exmc[8]; /* used for machine checks */ 145 u64 excrit[8]; /* used for crit interrupts */ 146 u64 exdbg[8]; /* used for debug interrupts */ 147 148 /* Kernel stack pointers for use by special exceptions */ 149 void *mc_kstack; 150 void *crit_kstack; 151 void *dbg_kstack; 152 153 struct tlb_core_data tcd; 154 #endif /* CONFIG_PPC_BOOK3E */ 155 156 #ifdef CONFIG_PPC_64S_HASH_MMU 157 unsigned char mm_ctx_low_slices_psize[BITS_PER_LONG / BITS_PER_BYTE]; 158 unsigned char mm_ctx_high_slices_psize[SLICE_ARRAY_SIZE]; 159 #endif 160 161 /* 162 * then miscellaneous read-write fields 163 */ 164 struct task_struct *__current; /* Pointer to current */ 165 u64 kstack; /* Saved Kernel stack addr */ 166 u64 saved_r1; /* r1 save for RTAS calls or PM or EE=0 */ 167 u64 saved_msr; /* MSR saved here by enter_rtas */ 168 #ifdef CONFIG_PPC64 169 u64 exit_save_r1; /* Syscall/interrupt R1 save */ 170 #endif 171 #ifdef CONFIG_PPC_BOOK3E 172 u16 trap_save; /* Used when bad stack is encountered */ 173 #endif 174 #ifdef CONFIG_PPC_BOOK3S_64 175 u8 hsrr_valid; /* HSRRs set for HRFID */ 176 u8 srr_valid; /* SRRs set for RFID */ 177 #endif 178 u8 irq_soft_mask; /* mask for irq soft masking */ 179 u8 irq_happened; /* irq happened while soft-disabled */ 180 u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */ 181 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE 182 u8 pmcregs_in_use; /* pseries puts this in lppaca */ 183 #endif 184 u64 sprg_vdso; /* Saved user-visible sprg */ 185 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 186 u64 tm_scratch; /* TM scratch area for reclaim */ 187 #endif 188 189 #ifdef CONFIG_PPC_POWERNV 190 /* PowerNV idle fields */ 191 /* PNV_CORE_IDLE_* bits, all siblings work on thread 0 paca */ 192 unsigned long idle_state; 193 union { 194 /* P7/P8 specific fields */ 195 struct { 196 /* PNV_THREAD_RUNNING/NAP/SLEEP */ 197 u8 thread_idle_state; 198 /* Mask to denote subcore sibling threads */ 199 u8 subcore_sibling_mask; 200 }; 201 202 /* P9 specific fields */ 203 struct { 204 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE 205 /* The PSSCR value that the kernel requested before going to stop */ 206 u64 requested_psscr; 207 /* Flag to request this thread not to stop */ 208 atomic_t dont_stop; 209 #endif 210 }; 211 }; 212 #endif 213 214 #ifdef CONFIG_PPC_BOOK3S_64 215 /* Non-maskable exceptions that are not performance critical */ 216 u64 exnmi[EX_SIZE]; /* used for system reset (nmi) */ 217 u64 exmc[EX_SIZE]; /* used for machine checks */ 218 #endif 219 #ifdef CONFIG_PPC_BOOK3S_64 220 /* Exclusive stacks for system reset and machine check exception. */ 221 void *nmi_emergency_sp; 222 void *mc_emergency_sp; 223 224 u16 in_nmi; /* In nmi handler */ 225 226 /* 227 * Flag to check whether we are in machine check early handler 228 * and already using emergency stack. 229 */ 230 u16 in_mce; 231 u8 hmi_event_available; /* HMI event is available */ 232 u8 hmi_p9_special_emu; /* HMI P9 special emulation */ 233 u32 hmi_irqs; /* HMI irq stat */ 234 #endif 235 u8 ftrace_enabled; /* Hard disable ftrace */ 236 237 /* Stuff for accurate time accounting */ 238 struct cpu_accounting_data accounting; 239 u64 dtl_ridx; /* read index in dispatch log */ 240 struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */ 241 242 #ifdef CONFIG_KVM_BOOK3S_HANDLER 243 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE 244 /* We use this to store guest state in */ 245 struct kvmppc_book3s_shadow_vcpu shadow_vcpu; 246 #endif 247 struct kvmppc_host_state kvm_hstate; 248 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE 249 /* 250 * Bitmap for sibling subcore status. See kvm/book3s_hv_ras.c for 251 * more details 252 */ 253 struct sibling_subcore_state *sibling_subcore_state; 254 #endif 255 #endif 256 #ifdef CONFIG_PPC_BOOK3S_64 257 /* 258 * rfi fallback flush must be in its own cacheline to prevent 259 * other paca data leaking into the L1d 260 */ 261 u64 exrfi[EX_SIZE] __aligned(0x80); 262 void *rfi_flush_fallback_area; 263 u64 l1d_flush_size; 264 #endif 265 #ifdef CONFIG_PPC_PSERIES 266 struct rtas_args *rtas_args_reentrant; 267 u8 *mce_data_buf; /* buffer to hold per cpu rtas errlog */ 268 #endif /* CONFIG_PPC_PSERIES */ 269 270 #ifdef CONFIG_PPC_BOOK3S_64 271 #ifdef CONFIG_PPC_64S_HASH_MMU 272 /* Capture SLB related old contents in MCE handler. */ 273 struct slb_entry *mce_faulty_slbs; 274 u16 slb_save_cache_ptr; 275 #endif 276 #endif /* CONFIG_PPC_BOOK3S_64 */ 277 #ifdef CONFIG_STACKPROTECTOR 278 unsigned long canary; 279 #endif 280 #ifdef CONFIG_MMIOWB 281 struct mmiowb_state mmiowb_state; 282 #endif 283 #ifdef CONFIG_PPC_BOOK3S_64 284 struct mce_info *mce_info; 285 u8 mce_pending_irq_work; 286 #endif /* CONFIG_PPC_BOOK3S_64 */ 287 } ____cacheline_aligned; 288 289 extern void copy_mm_to_paca(struct mm_struct *mm); 290 extern struct paca_struct **paca_ptrs; 291 extern void initialise_paca(struct paca_struct *new_paca, int cpu); 292 extern void setup_paca(struct paca_struct *new_paca); 293 extern void allocate_paca_ptrs(void); 294 extern void allocate_paca(int cpu); 295 extern void free_unused_pacas(void); 296 297 #else /* CONFIG_PPC64 */ 298 299 static inline void allocate_paca_ptrs(void) { } 300 static inline void allocate_paca(int cpu) { } 301 static inline void free_unused_pacas(void) { } 302 303 #endif /* CONFIG_PPC64 */ 304 305 #endif /* __KERNEL__ */ 306 #endif /* _ASM_POWERPC_PACA_H */ 307