1 /* SPDX-License-Identifier: GPL-2.0-or-later */
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.
7 * C 2001 PPC 64 Team, IBM Corp
9 #ifndef _ASM_POWERPC_PACA_H
10 #define _ASM_POWERPC_PACA_H
15 #include <linux/cache.h>
16 #include <linux/string.h>
17 #include <asm/types.h>
20 #ifdef CONFIG_PPC_BOOK3E_64
21 #include <asm/exception-64e.h>
23 #include <asm/exception-64s.h>
25 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
26 #include <asm/kvm_book3s_asm.h>
28 #include <asm/accounting.h>
30 #include <asm/cpuidle.h>
31 #include <asm/atomic.h>
34 #include <asm-generic/mmiowb_types.h>
36 register struct paca_struct *local_paca asm("r13");
38 #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
39 extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
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.
44 #define get_paca() ((void) debug_smp_processor_id(), local_paca)
46 #define get_paca() local_paca
49 #define get_slb_shadow() (get_paca()->slb_shadow_ptr)
56 * Defines the layout of the paca.
58 * This structure is not directly accessed by firmware or the service
62 #ifdef CONFIG_PPC_PSERIES
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.
70 struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */
71 #endif /* CONFIG_PPC_PSERIES */
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
80 u16 lock_token; /* Constant 0x8000, used in locks */
81 u16 paca_index; /* Logical processor number */
83 u16 paca_index; /* Logical processor number */
84 u16 lock_token; /* Constant 0x8000, used in locks */
87 u64 kernel_toc; /* Kernel TOC address */
88 u64 kernelbase; /* Base address of kernel */
89 u64 kernel_msr; /* MSR while running in kernel */
90 void *emergency_sp; /* pointer to emergency stack */
91 u64 data_offset; /* per cpu data offset */
92 s16 hw_cpu_id; /* Physical processor number */
93 u8 cpu_start; /* At startup, processor spins until */
94 /* this becomes non-zero. */
95 u8 kexec_state; /* set when kexec down has irqs off */
96 #ifdef CONFIG_PPC_BOOK3S_64
97 #ifdef CONFIG_PPC_64S_HASH_MMU
98 struct slb_shadow *slb_shadow_ptr;
100 struct dtl_entry *dispatch_log;
101 struct dtl_entry *dispatch_log_end;
103 u64 dscr_default; /* per-CPU default DSCR */
105 #ifdef CONFIG_PPC_BOOK3S_64
107 * Now, starting in cacheline 2, the exception save areas
109 /* used for most interrupts/exceptions */
110 u64 exgen[EX_SIZE] __attribute__((aligned(0x80)));
112 #ifdef CONFIG_PPC_64S_HASH_MMU
113 /* SLB related definitions */
116 u8 stab_rr; /* stab/slb round-robin counter */
117 #ifdef CONFIG_DEBUG_VM
118 u8 in_kernel_slb_handler;
120 u32 slb_used_bitmap; /* Bitmaps for first 32 SLB entries. */
122 u32 slb_cache[SLB_CACHE_ENTRIES];
124 #endif /* CONFIG_PPC_BOOK3S_64 */
126 #ifdef CONFIG_PPC_BOOK3E_64
127 u64 exgen[8] __aligned(0x40);
128 /* Keep pgd in the same cacheline as the start of extlb */
129 pgd_t *pgd __aligned(0x40); /* Current PGD */
130 pgd_t *kernel_pgd; /* Kernel PGD */
132 /* Shared by all threads of a core -- points to tcd of first thread */
133 struct tlb_core_data *tcd_ptr;
136 * We can have up to 3 levels of reentrancy in the TLB miss handler,
137 * in each of four exception levels (normal, crit, mcheck, debug).
139 u64 extlb[12][EX_TLB_SIZE / sizeof(u64)];
140 u64 exmc[8]; /* used for machine checks */
141 u64 excrit[8]; /* used for crit interrupts */
142 u64 exdbg[8]; /* used for debug interrupts */
144 /* Kernel stack pointers for use by special exceptions */
149 struct tlb_core_data tcd;
150 #endif /* CONFIG_PPC_BOOK3E_64 */
152 #ifdef CONFIG_PPC_64S_HASH_MMU
153 unsigned char mm_ctx_low_slices_psize[BITS_PER_LONG / BITS_PER_BYTE];
154 unsigned char mm_ctx_high_slices_psize[SLICE_ARRAY_SIZE];
158 * then miscellaneous read-write fields
160 struct task_struct *__current; /* Pointer to current */
161 u64 kstack; /* Saved Kernel stack addr */
162 u64 saved_r1; /* r1 save for RTAS calls or PM or EE=0 */
163 u64 saved_msr; /* MSR saved here by enter_rtas */
165 u64 exit_save_r1; /* Syscall/interrupt R1 save */
167 #ifdef CONFIG_PPC_BOOK3E_64
168 u16 trap_save; /* Used when bad stack is encountered */
170 #ifdef CONFIG_PPC_BOOK3S_64
171 u8 hsrr_valid; /* HSRRs set for HRFID */
172 u8 srr_valid; /* SRRs set for RFID */
174 u8 irq_soft_mask; /* mask for irq soft masking */
175 u8 irq_happened; /* irq happened while soft-disabled */
176 u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */
177 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
178 u8 pmcregs_in_use; /* pseries puts this in lppaca */
180 u64 sprg_vdso; /* Saved user-visible sprg */
181 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
182 u64 tm_scratch; /* TM scratch area for reclaim */
185 #ifdef CONFIG_PPC_POWERNV
186 /* PowerNV idle fields */
187 /* PNV_CORE_IDLE_* bits, all siblings work on thread 0 paca */
188 unsigned long idle_state;
190 /* P7/P8 specific fields */
192 /* PNV_THREAD_RUNNING/NAP/SLEEP */
193 u8 thread_idle_state;
194 /* Mask to denote subcore sibling threads */
195 u8 subcore_sibling_mask;
198 /* P9 specific fields */
200 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
201 /* The PSSCR value that the kernel requested before going to stop */
203 /* Flag to request this thread not to stop */
210 #ifdef CONFIG_PPC_BOOK3S_64
211 /* Non-maskable exceptions that are not performance critical */
212 u64 exnmi[EX_SIZE]; /* used for system reset (nmi) */
213 u64 exmc[EX_SIZE]; /* used for machine checks */
215 #ifdef CONFIG_PPC_BOOK3S_64
216 /* Exclusive stacks for system reset and machine check exception. */
217 void *nmi_emergency_sp;
218 void *mc_emergency_sp;
220 u16 in_nmi; /* In nmi handler */
223 * Flag to check whether we are in machine check early handler
224 * and already using emergency stack.
227 u8 hmi_event_available; /* HMI event is available */
228 u8 hmi_p9_special_emu; /* HMI P9 special emulation */
229 u32 hmi_irqs; /* HMI irq stat */
231 u8 ftrace_enabled; /* Hard disable ftrace */
233 /* Stuff for accurate time accounting */
234 struct cpu_accounting_data accounting;
235 u64 dtl_ridx; /* read index in dispatch log */
236 struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */
238 #ifdef CONFIG_KVM_BOOK3S_HANDLER
239 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
240 /* We use this to store guest state in */
241 struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
243 struct kvmppc_host_state kvm_hstate;
244 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
246 * Bitmap for sibling subcore status. See kvm/book3s_hv_ras.c for
249 struct sibling_subcore_state *sibling_subcore_state;
252 #ifdef CONFIG_PPC_BOOK3S_64
254 * rfi fallback flush must be in its own cacheline to prevent
255 * other paca data leaking into the L1d
257 u64 exrfi[EX_SIZE] __aligned(0x80);
258 void *rfi_flush_fallback_area;
261 #ifdef CONFIG_PPC_PSERIES
262 u8 *mce_data_buf; /* buffer to hold per cpu rtas errlog */
263 #endif /* CONFIG_PPC_PSERIES */
265 #ifdef CONFIG_PPC_BOOK3S_64
266 #ifdef CONFIG_PPC_64S_HASH_MMU
267 /* Capture SLB related old contents in MCE handler. */
268 struct slb_entry *mce_faulty_slbs;
269 u16 slb_save_cache_ptr;
271 #endif /* CONFIG_PPC_BOOK3S_64 */
272 #ifdef CONFIG_STACKPROTECTOR
273 unsigned long canary;
276 struct mmiowb_state mmiowb_state;
278 #ifdef CONFIG_PPC_BOOK3S_64
279 struct mce_info *mce_info;
280 u8 mce_pending_irq_work;
281 #endif /* CONFIG_PPC_BOOK3S_64 */
282 } ____cacheline_aligned;
284 extern void copy_mm_to_paca(struct mm_struct *mm);
285 extern struct paca_struct **paca_ptrs;
286 extern void initialise_paca(struct paca_struct *new_paca, int cpu);
287 extern void setup_paca(struct paca_struct *new_paca);
288 extern void allocate_paca_ptrs(void);
289 extern void allocate_paca(int cpu);
290 extern void free_unused_pacas(void);
292 #else /* CONFIG_PPC64 */
294 static inline void allocate_paca(int cpu) { }
295 static inline void free_unused_pacas(void) { }
297 #endif /* CONFIG_PPC64 */
299 #endif /* __KERNEL__ */
300 #endif /* _ASM_POWERPC_PACA_H */