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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
36register struct paca_struct *local_paca asm("r13");
37
38#if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
39extern 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
51struct task_struct;
52struct rtas_args;
53struct 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 */
61struct 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 u64 exit_save_r1; /* Syscall/interrupt R1 save */
167#ifdef CONFIG_PPC_BOOK3E_64
168 u16 trap_save; /* Used when bad stack is encountered */
169#endif
170#ifdef CONFIG_PPC_BOOK3S_64
171 u8 hsrr_valid; /* HSRRs set for HRFID */
172 u8 srr_valid; /* SRRs set for RFID */
173#endif
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 */
179#endif
180 u64 sprg_vdso; /* Saved user-visible sprg */
181#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
182 u64 tm_scratch; /* TM scratch area for reclaim */
183#endif
184
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_lock; /* A value of 1 means acquired */
189 unsigned long idle_state;
190 union {
191 /* P7/P8 specific fields */
192 struct {
193 /* PNV_THREAD_RUNNING/NAP/SLEEP */
194 u8 thread_idle_state;
195 /* Mask to denote subcore sibling threads */
196 u8 subcore_sibling_mask;
197 };
198
199 /* P9 specific fields */
200 struct {
201#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
202 /* The PSSCR value that the kernel requested before going to stop */
203 u64 requested_psscr;
204 /* Flag to request this thread not to stop */
205 atomic_t dont_stop;
206#endif
207 };
208 };
209#endif
210
211#ifdef CONFIG_PPC_BOOK3S_64
212 /* Non-maskable exceptions that are not performance critical */
213 u64 exnmi[EX_SIZE]; /* used for system reset (nmi) */
214 u64 exmc[EX_SIZE]; /* used for machine checks */
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 u32 hmi_irqs; /* HMI irq stat */
229#endif
230 u8 ftrace_enabled; /* Hard disable ftrace */
231
232 /* Stuff for accurate time accounting */
233 struct cpu_accounting_data accounting;
234 u64 dtl_ridx; /* read index in dispatch log */
235 struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */
236
237#ifdef CONFIG_KVM_BOOK3S_HANDLER
238#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
239 /* We use this to store guest state in */
240 struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
241#endif
242 struct kvmppc_host_state kvm_hstate;
243#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
244 /*
245 * Bitmap for sibling subcore status. See kvm/book3s_hv_ras.c for
246 * more details
247 */
248 struct sibling_subcore_state *sibling_subcore_state;
249#endif
250#endif
251#ifdef CONFIG_PPC_BOOK3S_64
252 /*
253 * rfi fallback flush must be in its own cacheline to prevent
254 * other paca data leaking into the L1d
255 */
256 u64 exrfi[EX_SIZE] __aligned(0x80);
257 void *rfi_flush_fallback_area;
258 u64 l1d_flush_size;
259#endif
260#ifdef CONFIG_PPC_PSERIES
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#ifdef CONFIG_PPC_64S_HASH_MMU
266 /* Capture SLB related old contents in MCE handler. */
267 struct slb_entry *mce_faulty_slbs;
268 u16 slb_save_cache_ptr;
269#endif
270#endif /* CONFIG_PPC_BOOK3S_64 */
271#ifdef CONFIG_STACKPROTECTOR
272 unsigned long canary;
273#endif
274#ifdef CONFIG_MMIOWB
275 struct mmiowb_state mmiowb_state;
276#endif
277#ifdef CONFIG_PPC_BOOK3S_64
278 struct mce_info *mce_info;
279 u8 mce_pending_irq_work;
280#endif /* CONFIG_PPC_BOOK3S_64 */
281} ____cacheline_aligned;
282
283extern void copy_mm_to_paca(struct mm_struct *mm);
284extern struct paca_struct **paca_ptrs;
285extern void initialise_paca(struct paca_struct *new_paca, int cpu);
286extern void setup_paca(struct paca_struct *new_paca);
287extern void allocate_paca_ptrs(void);
288extern void allocate_paca(int cpu);
289extern void free_unused_pacas(void);
290
291#else /* CONFIG_PPC64 */
292
293static inline void allocate_paca(int cpu) { }
294static inline void free_unused_pacas(void) { }
295
296#endif /* CONFIG_PPC64 */
297
298#endif /* __KERNEL__ */
299#endif /* _ASM_POWERPC_PACA_H */
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#include <asm/atomic.h>
36
37register struct paca_struct *local_paca asm("r13");
38
39#if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
40extern 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
56struct task_struct;
57
58/*
59 * Defines the layout of the paca.
60 *
61 * This structure is not directly accessed by firmware or the service
62 * processor.
63 */
64struct paca_struct {
65#ifdef CONFIG_PPC_PSERIES
66 /*
67 * Because hw_cpu_id, unlike other paca fields, is accessed
68 * routinely from other CPUs (from the IRQ code), we stick to
69 * read-only (after boot) fields in the first cacheline to
70 * avoid cacheline bouncing.
71 */
72
73 struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */
74#endif /* CONFIG_PPC_PSERIES */
75
76 /*
77 * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c
78 * load lock_token and paca_index with a single lwz
79 * instruction. They must travel together and be properly
80 * aligned.
81 */
82#ifdef __BIG_ENDIAN__
83 u16 lock_token; /* Constant 0x8000, used in locks */
84 u16 paca_index; /* Logical processor number */
85#else
86 u16 paca_index; /* Logical processor number */
87 u16 lock_token; /* Constant 0x8000, used in locks */
88#endif
89
90 u64 kernel_toc; /* Kernel TOC address */
91 u64 kernelbase; /* Base address of kernel */
92 u64 kernel_msr; /* MSR while running in kernel */
93 void *emergency_sp; /* pointer to emergency stack */
94 u64 data_offset; /* per cpu data offset */
95 s16 hw_cpu_id; /* Physical processor number */
96 u8 cpu_start; /* At startup, processor spins until */
97 /* this becomes non-zero. */
98 u8 kexec_state; /* set when kexec down has irqs off */
99#ifdef CONFIG_PPC_BOOK3S_64
100 struct slb_shadow *slb_shadow_ptr;
101 struct dtl_entry *dispatch_log;
102 struct dtl_entry *dispatch_log_end;
103#endif
104 u64 dscr_default; /* per-CPU default DSCR */
105
106#ifdef CONFIG_PPC_BOOK3S_64
107 /*
108 * Now, starting in cacheline 2, the exception save areas
109 */
110 /* used for most interrupts/exceptions */
111 u64 exgen[EX_SIZE] __attribute__((aligned(0x80)));
112 u64 exslb[EX_SIZE]; /* used for SLB/segment table misses
113 * on the linear mapping */
114 /* SLB related definitions */
115 u16 vmalloc_sllp;
116 u16 slb_cache_ptr;
117 u32 slb_cache[SLB_CACHE_ENTRIES];
118#endif /* CONFIG_PPC_BOOK3S_64 */
119
120#ifdef CONFIG_PPC_BOOK3E
121 u64 exgen[8] __aligned(0x40);
122 /* Keep pgd in the same cacheline as the start of extlb */
123 pgd_t *pgd __aligned(0x40); /* Current PGD */
124 pgd_t *kernel_pgd; /* Kernel PGD */
125
126 /* Shared by all threads of a core -- points to tcd of first thread */
127 struct tlb_core_data *tcd_ptr;
128
129 /*
130 * We can have up to 3 levels of reentrancy in the TLB miss handler,
131 * in each of four exception levels (normal, crit, mcheck, debug).
132 */
133 u64 extlb[12][EX_TLB_SIZE / sizeof(u64)];
134 u64 exmc[8]; /* used for machine checks */
135 u64 excrit[8]; /* used for crit interrupts */
136 u64 exdbg[8]; /* used for debug interrupts */
137
138 /* Kernel stack pointers for use by special exceptions */
139 void *mc_kstack;
140 void *crit_kstack;
141 void *dbg_kstack;
142
143 struct tlb_core_data tcd;
144#endif /* CONFIG_PPC_BOOK3E */
145
146#ifdef CONFIG_PPC_BOOK3S
147 mm_context_id_t mm_ctx_id;
148#ifdef CONFIG_PPC_MM_SLICES
149 unsigned char mm_ctx_low_slices_psize[BITS_PER_LONG / BITS_PER_BYTE];
150 unsigned char mm_ctx_high_slices_psize[SLICE_ARRAY_SIZE];
151 unsigned long mm_ctx_slb_addr_limit;
152#else
153 u16 mm_ctx_user_psize;
154 u16 mm_ctx_sllp;
155#endif
156#endif
157
158 /*
159 * then miscellaneous read-write fields
160 */
161 struct task_struct *__current; /* Pointer to current */
162 u64 kstack; /* Saved Kernel stack addr */
163 u64 stab_rr; /* stab/slb round-robin counter */
164 u64 saved_r1; /* r1 save for RTAS calls or PM */
165 u64 saved_msr; /* MSR saved here by enter_rtas */
166 u16 trap_save; /* Used when bad stack is encountered */
167 u8 irq_soft_mask; /* mask for irq soft masking */
168 u8 irq_happened; /* irq happened while soft-disabled */
169 u8 io_sync; /* writel() needs spin_unlock sync */
170 u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */
171 u8 nap_state_lost; /* NV GPR values lost in power7_idle */
172#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
173 u8 pmcregs_in_use; /* pseries puts this in lppaca */
174#endif
175 u64 sprg_vdso; /* Saved user-visible sprg */
176#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
177 u64 tm_scratch; /* TM scratch area for reclaim */
178#endif
179
180#ifdef CONFIG_PPC_POWERNV
181 /* Per-core mask tracking idle threads and a lock bit-[L][TTTTTTTT] */
182 u32 *core_idle_state_ptr;
183 u8 thread_idle_state; /* PNV_THREAD_RUNNING/NAP/SLEEP */
184 /* Mask to indicate thread id in core */
185 u8 thread_mask;
186 /* Mask to denote subcore sibling threads */
187 u8 subcore_sibling_mask;
188 /* Flag to request this thread not to stop */
189 atomic_t dont_stop;
190 /*
191 * Pointer to an array which contains pointer
192 * to the sibling threads' paca.
193 */
194 struct paca_struct **thread_sibling_pacas;
195 /* The PSSCR value that the kernel requested before going to stop */
196 u64 requested_psscr;
197
198 /*
199 * Save area for additional SPRs that need to be
200 * saved/restored during cpuidle stop.
201 */
202 struct stop_sprs stop_sprs;
203#endif
204
205#ifdef CONFIG_PPC_BOOK3S_64
206 /* Non-maskable exceptions that are not performance critical */
207 u64 exnmi[EX_SIZE]; /* used for system reset (nmi) */
208 u64 exmc[EX_SIZE]; /* used for machine checks */
209#endif
210#ifdef CONFIG_PPC_BOOK3S_64
211 /* Exclusive stacks for system reset and machine check exception. */
212 void *nmi_emergency_sp;
213 void *mc_emergency_sp;
214
215 u16 in_nmi; /* In nmi handler */
216
217 /*
218 * Flag to check whether we are in machine check early handler
219 * and already using emergency stack.
220 */
221 u16 in_mce;
222 u8 hmi_event_available; /* HMI event is available */
223 u8 hmi_p9_special_emu; /* HMI P9 special emulation */
224#endif
225
226 /* Stuff for accurate time accounting */
227 struct cpu_accounting_data accounting;
228 u64 dtl_ridx; /* read index in dispatch log */
229 struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */
230
231#ifdef CONFIG_KVM_BOOK3S_HANDLER
232#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
233 /* We use this to store guest state in */
234 struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
235#endif
236 struct kvmppc_host_state kvm_hstate;
237#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
238 /*
239 * Bitmap for sibling subcore status. See kvm/book3s_hv_ras.c for
240 * more details
241 */
242 struct sibling_subcore_state *sibling_subcore_state;
243#endif
244#endif
245#ifdef CONFIG_PPC_BOOK3S_64
246 /*
247 * rfi fallback flush must be in its own cacheline to prevent
248 * other paca data leaking into the L1d
249 */
250 u64 exrfi[EX_SIZE] __aligned(0x80);
251 void *rfi_flush_fallback_area;
252 u64 l1d_flush_size;
253#endif
254} ____cacheline_aligned;
255
256extern void copy_mm_to_paca(struct mm_struct *mm);
257extern struct paca_struct **paca_ptrs;
258extern void initialise_paca(struct paca_struct *new_paca, int cpu);
259extern void setup_paca(struct paca_struct *new_paca);
260extern void allocate_paca_ptrs(void);
261extern void allocate_paca(int cpu);
262extern void free_unused_pacas(void);
263
264#else /* CONFIG_PPC64 */
265
266static inline void allocate_paca_ptrs(void) { };
267static inline void allocate_paca(int cpu) { };
268static inline void free_unused_pacas(void) { };
269
270#endif /* CONFIG_PPC64 */
271
272#endif /* __KERNEL__ */
273#endif /* _ASM_POWERPC_PACA_H */