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/string.h>
16 #include <asm/types.h>
17 #include <asm/lppaca.h>
18 #include <asm/mmu.h>
19 #include <asm/page.h>
20 #ifdef CONFIG_PPC_BOOK3E
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
33 #include <asm-generic/mmiowb_types.h>
34
35 register struct paca_struct *local_paca asm("r13");
36
37 #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
38 extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
39 /*
40 * Add standard checks that preemption cannot occur when using get_paca():
41 * otherwise the paca_struct it points to may be the wrong one just after.
42 */
43 #define get_paca() ((void) debug_smp_processor_id(), local_paca)
44 #else
45 #define get_paca() local_paca
46 #endif
47
48 #ifdef CONFIG_PPC_PSERIES
49 #define get_lppaca() (get_paca()->lppaca_ptr)
50 #endif
51
52 #define get_slb_shadow() (get_paca()->slb_shadow_ptr)
53
54 struct task_struct;
55
56 /*
57 * Defines the layout of the paca.
58 *
59 * This structure is not directly accessed by firmware or the service
60 * processor.
61 */
62 struct paca_struct {
63 #ifdef CONFIG_PPC_PSERIES
64 /*
65 * Because hw_cpu_id, unlike other paca fields, is accessed
66 * routinely from other CPUs (from the IRQ code), we stick to
67 * read-only (after boot) fields in the first cacheline to
68 * avoid cacheline bouncing.
69 */
70
71 struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */
72 #endif /* CONFIG_PPC_PSERIES */
73
74 /*
75 * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c
76 * load lock_token and paca_index with a single lwz
77 * instruction. They must travel together and be properly
78 * aligned.
79 */
80 #ifdef __BIG_ENDIAN__
81 u16 lock_token; /* Constant 0x8000, used in locks */
82 u16 paca_index; /* Logical processor number */
83 #else
84 u16 paca_index; /* Logical processor number */
85 u16 lock_token; /* Constant 0x8000, used in locks */
86 #endif
87
88 u64 kernel_toc; /* Kernel TOC address */
89 u64 kernelbase; /* Base address of kernel */
90 u64 kernel_msr; /* MSR while running in kernel */
91 void *emergency_sp; /* pointer to emergency stack */
92 u64 data_offset; /* per cpu data offset */
93 s16 hw_cpu_id; /* Physical processor number */
94 u8 cpu_start; /* At startup, processor spins until */
95 /* this becomes non-zero. */
96 u8 kexec_state; /* set when kexec down has irqs off */
97 #ifdef CONFIG_PPC_BOOK3S_64
98 struct slb_shadow *slb_shadow_ptr;
99 struct dtl_entry *dispatch_log;
100 struct dtl_entry *dispatch_log_end;
101 #endif
102 u64 dscr_default; /* per-CPU default DSCR */
103
104 #ifdef CONFIG_PPC_BOOK3S_64
105 /*
106 * Now, starting in cacheline 2, the exception save areas
107 */
108 /* used for most interrupts/exceptions */
109 u64 exgen[EX_SIZE] __attribute__((aligned(0x80)));
110 u64 exslb[EX_SIZE]; /* used for SLB/segment table misses
111 * on the linear mapping */
112 /* SLB related definitions */
113 u16 vmalloc_sllp;
114 u8 slb_cache_ptr;
115 u8 stab_rr; /* stab/slb round-robin counter */
116 #ifdef CONFIG_DEBUG_VM
117 u8 in_kernel_slb_handler;
118 #endif
119 u32 slb_used_bitmap; /* Bitmaps for first 32 SLB entries. */
120 u32 slb_kern_bitmap;
121 u32 slb_cache[SLB_CACHE_ENTRIES];
122 #endif /* CONFIG_PPC_BOOK3S_64 */
123
124 #ifdef CONFIG_PPC_BOOK3E
125 u64 exgen[8] __aligned(0x40);
126 /* Keep pgd in the same cacheline as the start of extlb */
127 pgd_t *pgd __aligned(0x40); /* Current PGD */
128 pgd_t *kernel_pgd; /* Kernel PGD */
129
130 /* Shared by all threads of a core -- points to tcd of first thread */
131 struct tlb_core_data *tcd_ptr;
132
133 /*
134 * We can have up to 3 levels of reentrancy in the TLB miss handler,
135 * in each of four exception levels (normal, crit, mcheck, debug).
136 */
137 u64 extlb[12][EX_TLB_SIZE / sizeof(u64)];
138 u64 exmc[8]; /* used for machine checks */
139 u64 excrit[8]; /* used for crit interrupts */
140 u64 exdbg[8]; /* used for debug interrupts */
141
142 /* Kernel stack pointers for use by special exceptions */
143 void *mc_kstack;
144 void *crit_kstack;
145 void *dbg_kstack;
146
147 struct tlb_core_data tcd;
148 #endif /* CONFIG_PPC_BOOK3E */
149
150 #ifdef CONFIG_PPC_BOOK3S
151 mm_context_id_t mm_ctx_id;
152 #ifdef CONFIG_PPC_MM_SLICES
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];
155 unsigned long mm_ctx_slb_addr_limit;
156 #else
157 u16 mm_ctx_user_psize;
158 u16 mm_ctx_sllp;
159 #endif
160 #endif
161
162 /*
163 * then miscellaneous read-write fields
164 */
165 struct task_struct *__current; /* Pointer to current */
166 u64 kstack; /* Saved Kernel stack addr */
167 u64 saved_r1; /* r1 save for RTAS calls or PM or EE=0 */
168 u64 saved_msr; /* MSR saved here by enter_rtas */
169 #ifdef CONFIG_PPC_BOOK3E
170 u16 trap_save; /* Used when bad stack is encountered */
171 #endif
172 u8 irq_soft_mask; /* mask for irq soft masking */
173 u8 irq_happened; /* irq happened while soft-disabled */
174 u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */
175 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
176 u8 pmcregs_in_use; /* pseries puts this in lppaca */
177 #endif
178 u64 sprg_vdso; /* Saved user-visible sprg */
179 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
180 u64 tm_scratch; /* TM scratch area for reclaim */
181 #endif
182
183 #ifdef CONFIG_PPC_POWERNV
184 /* PowerNV idle fields */
185 /* PNV_CORE_IDLE_* bits, all siblings work on thread 0 paca */
186 unsigned long idle_state;
187 union {
188 /* P7/P8 specific fields */
189 struct {
190 /* PNV_THREAD_RUNNING/NAP/SLEEP */
191 u8 thread_idle_state;
192 /* Mask to denote subcore sibling threads */
193 u8 subcore_sibling_mask;
194 };
195
196 /* P9 specific fields */
197 struct {
198 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
199 /* The PSSCR value that the kernel requested before going to stop */
200 u64 requested_psscr;
201 /* Flag to request this thread not to stop */
202 atomic_t dont_stop;
203 #endif
204 };
205 };
206 #endif
207
208 #ifdef CONFIG_PPC_BOOK3S_64
209 /* Non-maskable exceptions that are not performance critical */
210 u64 exnmi[EX_SIZE]; /* used for system reset (nmi) */
211 u64 exmc[EX_SIZE]; /* used for machine checks */
212 #endif
213 #ifdef CONFIG_PPC_BOOK3S_64
214 /* Exclusive stacks for system reset and machine check exception. */
215 void *nmi_emergency_sp;
216 void *mc_emergency_sp;
217
218 u16 in_nmi; /* In nmi handler */
219
220 /*
221 * Flag to check whether we are in machine check early handler
222 * and already using emergency stack.
223 */
224 u16 in_mce;
225 u8 hmi_event_available; /* HMI event is available */
226 u8 hmi_p9_special_emu; /* HMI P9 special emulation */
227 #endif
228 u8 ftrace_enabled; /* Hard disable ftrace */
229
230 /* Stuff for accurate time accounting */
231 struct cpu_accounting_data accounting;
232 u64 dtl_ridx; /* read index in dispatch log */
233 struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */
234
235 #ifdef CONFIG_KVM_BOOK3S_HANDLER
236 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
237 /* We use this to store guest state in */
238 struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
239 #endif
240 struct kvmppc_host_state kvm_hstate;
241 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
242 /*
243 * Bitmap for sibling subcore status. See kvm/book3s_hv_ras.c for
244 * more details
245 */
246 struct sibling_subcore_state *sibling_subcore_state;
247 #endif
248 #endif
249 #ifdef CONFIG_PPC_BOOK3S_64
250 /*
251 * rfi fallback flush must be in its own cacheline to prevent
252 * other paca data leaking into the L1d
253 */
254 u64 exrfi[EX_SIZE] __aligned(0x80);
255 void *rfi_flush_fallback_area;
256 u64 l1d_flush_size;
257 #endif
258 #ifdef CONFIG_PPC_PSERIES
259 u8 *mce_data_buf; /* buffer to hold per cpu rtas errlog */
260 #endif /* CONFIG_PPC_PSERIES */
261
262 #ifdef CONFIG_PPC_BOOK3S_64
263 /* Capture SLB related old contents in MCE handler. */
264 struct slb_entry *mce_faulty_slbs;
265 u16 slb_save_cache_ptr;
266 #endif /* CONFIG_PPC_BOOK3S_64 */
267 #ifdef CONFIG_STACKPROTECTOR
268 unsigned long canary;
269 #endif
270 #ifdef CONFIG_MMIOWB
271 struct mmiowb_state mmiowb_state;
272 #endif
273 } ____cacheline_aligned;
274
275 extern void copy_mm_to_paca(struct mm_struct *mm);
276 extern struct paca_struct **paca_ptrs;
277 extern void initialise_paca(struct paca_struct *new_paca, int cpu);
278 extern void setup_paca(struct paca_struct *new_paca);
279 extern void allocate_paca_ptrs(void);
280 extern void allocate_paca(int cpu);
281 extern void free_unused_pacas(void);
282
283 #else /* CONFIG_PPC64 */
284
allocate_paca_ptrs(void)285 static inline void allocate_paca_ptrs(void) { };
allocate_paca(int cpu)286 static inline void allocate_paca(int cpu) { };
free_unused_pacas(void)287 static inline void free_unused_pacas(void) { };
288
289 #endif /* CONFIG_PPC64 */
290
291 #endif /* __KERNEL__ */
292 #endif /* _ASM_POWERPC_PACA_H */
293