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/mmu.h> 19 #include <asm/page.h> 20 #ifdef CONFIG_PPC_BOOK3E_64 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/mce.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 #define get_slb_shadow() (get_paca()->slb_shadow_ptr) 50 51 struct task_struct; 52 struct rtas_args; 53 struct lppaca; 54 55 /* 56 * Defines the layout of the paca. 57 * 58 * This structure is not directly accessed by firmware or the service 59 * processor. 60 */ 61 struct paca_struct { 62 #ifdef CONFIG_PPC_PSERIES 63 /* 64 * Because hw_cpu_id, unlike other paca fields, is accessed 65 * routinely from other CPUs (from the IRQ code), we stick to 66 * read-only (after boot) fields in the first cacheline to 67 * avoid cacheline bouncing. 68 */ 69 70 struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */ 71 #endif /* CONFIG_PPC_PSERIES */ 72 73 /* 74 * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c 75 * load lock_token and paca_index with a single lwz 76 * instruction. They must travel together and be properly 77 * aligned. 78 */ 79 #ifdef __BIG_ENDIAN__ 80 u16 lock_token; /* Constant 0x8000, used in locks */ 81 u16 paca_index; /* Logical processor number */ 82 #else 83 u16 paca_index; /* Logical processor number */ 84 u16 lock_token; /* Constant 0x8000, used in locks */ 85 #endif 86 87 #ifndef CONFIG_PPC_KERNEL_PCREL 88 u64 kernel_toc; /* Kernel TOC address */ 89 #endif 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 #ifdef CONFIG_PPC_64S_HASH_MMU 100 struct slb_shadow *slb_shadow_ptr; 101 #endif 102 struct dtl_entry *dispatch_log; 103 struct dtl_entry *dispatch_log_end; 104 #endif 105 u64 dscr_default; /* per-CPU default DSCR */ 106 107 #ifdef CONFIG_PPC_BOOK3S_64 108 /* 109 * Now, starting in cacheline 2, the exception save areas 110 */ 111 /* used for most interrupts/exceptions */ 112 u64 exgen[EX_SIZE] __attribute__((aligned(0x80))); 113 114 #ifdef CONFIG_PPC_64S_HASH_MMU 115 /* SLB related definitions */ 116 u16 vmalloc_sllp; 117 u8 slb_cache_ptr; 118 u8 stab_rr; /* stab/slb round-robin counter */ 119 #ifdef CONFIG_DEBUG_VM 120 u8 in_kernel_slb_handler; 121 #endif 122 u32 slb_used_bitmap; /* Bitmaps for first 32 SLB entries. */ 123 u32 slb_kern_bitmap; 124 u32 slb_cache[SLB_CACHE_ENTRIES]; 125 #endif 126 #endif /* CONFIG_PPC_BOOK3S_64 */ 127 128 #ifdef CONFIG_PPC_BOOK3E_64 129 u64 exgen[8] __aligned(0x40); 130 /* Keep pgd in the same cacheline as the start of extlb */ 131 pgd_t *pgd __aligned(0x40); /* Current PGD */ 132 pgd_t *kernel_pgd; /* Kernel PGD */ 133 134 /* Shared by all threads of a core -- points to tcd of first thread */ 135 struct tlb_core_data *tcd_ptr; 136 137 /* 138 * We can have up to 3 levels of reentrancy in the TLB miss handler, 139 * in each of four exception levels (normal, crit, mcheck, debug). 140 */ 141 u64 extlb[12][EX_TLB_SIZE / sizeof(u64)]; 142 u64 exmc[8]; /* used for machine checks */ 143 u64 excrit[8]; /* used for crit interrupts */ 144 u64 exdbg[8]; /* used for debug interrupts */ 145 146 /* Kernel stack pointers for use by special exceptions */ 147 void *mc_kstack; 148 void *crit_kstack; 149 void *dbg_kstack; 150 151 struct tlb_core_data tcd; 152 #endif /* CONFIG_PPC_BOOK3E_64 */ 153 154 #ifdef CONFIG_PPC_64S_HASH_MMU 155 unsigned char mm_ctx_low_slices_psize[BITS_PER_LONG / BITS_PER_BYTE]; 156 unsigned char mm_ctx_high_slices_psize[SLICE_ARRAY_SIZE]; 157 #endif 158 159 /* 160 * then miscellaneous read-write fields 161 */ 162 struct task_struct *__current; /* Pointer to current */ 163 u64 kstack; /* Saved Kernel stack addr */ 164 u64 saved_r1; /* r1 save for RTAS calls or PM or EE=0 */ 165 u64 saved_msr; /* MSR saved here by enter_rtas */ 166 #ifdef CONFIG_PPC64 167 u64 exit_save_r1; /* Syscall/interrupt R1 save */ 168 #endif 169 #ifdef CONFIG_PPC_BOOK3E_64 170 u16 trap_save; /* Used when bad stack is encountered */ 171 #endif 172 #ifdef CONFIG_PPC_BOOK3S_64 173 u8 hsrr_valid; /* HSRRs set for HRFID */ 174 u8 srr_valid; /* SRRs set for RFID */ 175 #endif 176 u8 irq_soft_mask; /* mask for irq soft masking */ 177 u8 irq_happened; /* irq happened while soft-disabled */ 178 u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */ 179 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE 180 u8 pmcregs_in_use; /* pseries puts this in lppaca */ 181 #endif 182 u64 sprg_vdso; /* Saved user-visible sprg */ 183 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 184 u64 tm_scratch; /* TM scratch area for reclaim */ 185 #endif 186 187 #ifdef CONFIG_PPC_POWERNV 188 /* PowerNV idle fields */ 189 /* PNV_CORE_IDLE_* bits, all siblings work on thread 0 paca */ 190 unsigned long idle_lock; /* A value of 1 means acquired */ 191 unsigned long idle_state; 192 union { 193 /* P7/P8 specific fields */ 194 struct { 195 /* PNV_THREAD_RUNNING/NAP/SLEEP */ 196 u8 thread_idle_state; 197 /* Mask to denote subcore sibling threads */ 198 u8 subcore_sibling_mask; 199 }; 200 201 /* P9 specific fields */ 202 struct { 203 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE 204 /* The PSSCR value that the kernel requested before going to stop */ 205 u64 requested_psscr; 206 /* Flag to request this thread not to stop */ 207 atomic_t dont_stop; 208 #endif 209 }; 210 }; 211 #endif 212 213 #ifdef CONFIG_PPC_BOOK3S_64 214 /* Non-maskable exceptions that are not performance critical */ 215 u64 exnmi[EX_SIZE]; /* used for system reset (nmi) */ 216 u64 exmc[EX_SIZE]; /* used for machine checks */ 217 #endif 218 #ifdef CONFIG_PPC_BOOK3S_64 219 /* Exclusive stacks for system reset and machine check exception. */ 220 void *nmi_emergency_sp; 221 void *mc_emergency_sp; 222 223 u16 in_nmi; /* In nmi handler */ 224 225 /* 226 * Flag to check whether we are in machine check early handler 227 * and already using emergency stack. 228 */ 229 u16 in_mce; 230 u8 hmi_event_available; /* HMI event is available */ 231 u8 hmi_p9_special_emu; /* HMI P9 special emulation */ 232 u32 hmi_irqs; /* HMI irq stat */ 233 #endif 234 u8 ftrace_enabled; /* Hard disable ftrace */ 235 236 /* Stuff for accurate time accounting */ 237 struct cpu_accounting_data accounting; 238 u64 dtl_ridx; /* read index in dispatch log */ 239 struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */ 240 241 #ifdef CONFIG_KVM_BOOK3S_HANDLER 242 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE 243 /* We use this to store guest state in */ 244 struct kvmppc_book3s_shadow_vcpu shadow_vcpu; 245 #endif 246 struct kvmppc_host_state kvm_hstate; 247 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE 248 /* 249 * Bitmap for sibling subcore status. See kvm/book3s_hv_ras.c for 250 * more details 251 */ 252 struct sibling_subcore_state *sibling_subcore_state; 253 #endif 254 #endif 255 #ifdef CONFIG_PPC_BOOK3S_64 256 /* 257 * rfi fallback flush must be in its own cacheline to prevent 258 * other paca data leaking into the L1d 259 */ 260 u64 exrfi[EX_SIZE] __aligned(0x80); 261 void *rfi_flush_fallback_area; 262 u64 l1d_flush_size; 263 #endif 264 #ifdef CONFIG_PPC_PSERIES 265 u8 *mce_data_buf; /* buffer to hold per cpu rtas errlog */ 266 #endif /* CONFIG_PPC_PSERIES */ 267 268 #ifdef CONFIG_PPC_BOOK3S_64 269 #ifdef CONFIG_PPC_64S_HASH_MMU 270 /* Capture SLB related old contents in MCE handler. */ 271 struct slb_entry *mce_faulty_slbs; 272 u16 slb_save_cache_ptr; 273 #endif 274 #endif /* CONFIG_PPC_BOOK3S_64 */ 275 #ifdef CONFIG_STACKPROTECTOR 276 unsigned long canary; 277 #endif 278 #ifdef CONFIG_MMIOWB 279 struct mmiowb_state mmiowb_state; 280 #endif 281 #ifdef CONFIG_PPC_BOOK3S_64 282 struct mce_info *mce_info; 283 u8 mce_pending_irq_work; 284 #endif /* CONFIG_PPC_BOOK3S_64 */ 285 } ____cacheline_aligned; 286 287 extern void copy_mm_to_paca(struct mm_struct *mm); 288 extern struct paca_struct **paca_ptrs; 289 extern void initialise_paca(struct paca_struct *new_paca, int cpu); 290 extern void setup_paca(struct paca_struct *new_paca); 291 extern void allocate_paca_ptrs(void); 292 extern void allocate_paca(int cpu); 293 extern void free_unused_pacas(void); 294 295 #else /* CONFIG_PPC64 */ 296 297 static inline void allocate_paca(int cpu) { } 298 static inline void free_unused_pacas(void) { } 299 300 #endif /* CONFIG_PPC64 */ 301 302 #endif /* __KERNEL__ */ 303 #endif /* _ASM_POWERPC_PACA_H */ 304