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
allocate_paca(int cpu)297 static inline void allocate_paca(int cpu) { }
free_unused_pacas(void)298 static inline void free_unused_pacas(void) { }
299
300 #endif /* CONFIG_PPC64 */
301
302 #endif /* __KERNEL__ */
303 #endif /* _ASM_POWERPC_PACA_H */
304