xref: /openbmc/linux/arch/powerpc/include/asm/paca.h (revision a32cc817)
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 #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 #ifdef CONFIG_PPC_PSERIES
50 #define get_lppaca()	(get_paca()->lppaca_ptr)
51 #endif
52 
53 #define get_slb_shadow()	(get_paca()->slb_shadow_ptr)
54 
55 struct task_struct;
56 struct rtas_args;
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  */
64 struct 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 #ifdef CONFIG_PPC_64S_HASH_MMU
101 	struct slb_shadow *slb_shadow_ptr;
102 #endif
103 	struct dtl_entry *dispatch_log;
104 	struct dtl_entry *dispatch_log_end;
105 #endif
106 	u64 dscr_default;		/* per-CPU default DSCR */
107 
108 #ifdef CONFIG_PPC_BOOK3S_64
109 	/*
110 	 * Now, starting in cacheline 2, the exception save areas
111 	 */
112 	/* used for most interrupts/exceptions */
113 	u64 exgen[EX_SIZE] __attribute__((aligned(0x80)));
114 
115 #ifdef CONFIG_PPC_64S_HASH_MMU
116 	/* SLB related definitions */
117 	u16 vmalloc_sllp;
118 	u8 slb_cache_ptr;
119 	u8 stab_rr;			/* stab/slb round-robin counter */
120 #ifdef CONFIG_DEBUG_VM
121 	u8 in_kernel_slb_handler;
122 #endif
123 	u32 slb_used_bitmap;		/* Bitmaps for first 32 SLB entries. */
124 	u32 slb_kern_bitmap;
125 	u32 slb_cache[SLB_CACHE_ENTRIES];
126 #endif
127 #endif /* CONFIG_PPC_BOOK3S_64 */
128 
129 #ifdef CONFIG_PPC_BOOK3E
130 	u64 exgen[8] __aligned(0x40);
131 	/* Keep pgd in the same cacheline as the start of extlb */
132 	pgd_t *pgd __aligned(0x40); /* Current PGD */
133 	pgd_t *kernel_pgd;		/* Kernel PGD */
134 
135 	/* Shared by all threads of a core -- points to tcd of first thread */
136 	struct tlb_core_data *tcd_ptr;
137 
138 	/*
139 	 * We can have up to 3 levels of reentrancy in the TLB miss handler,
140 	 * in each of four exception levels (normal, crit, mcheck, debug).
141 	 */
142 	u64 extlb[12][EX_TLB_SIZE / sizeof(u64)];
143 	u64 exmc[8];		/* used for machine checks */
144 	u64 excrit[8];		/* used for crit interrupts */
145 	u64 exdbg[8];		/* used for debug interrupts */
146 
147 	/* Kernel stack pointers for use by special exceptions */
148 	void *mc_kstack;
149 	void *crit_kstack;
150 	void *dbg_kstack;
151 
152 	struct tlb_core_data tcd;
153 #endif /* CONFIG_PPC_BOOK3E */
154 
155 #ifdef CONFIG_PPC_BOOK3S
156 #ifdef CONFIG_PPC_64S_HASH_MMU
157 #ifdef CONFIG_PPC_MM_SLICES
158 	unsigned char mm_ctx_low_slices_psize[BITS_PER_LONG / BITS_PER_BYTE];
159 	unsigned char mm_ctx_high_slices_psize[SLICE_ARRAY_SIZE];
160 #else
161 	u16 mm_ctx_user_psize;
162 	u16 mm_ctx_sllp;
163 #endif
164 #endif
165 #endif
166 
167 	/*
168 	 * then miscellaneous read-write fields
169 	 */
170 	struct task_struct *__current;	/* Pointer to current */
171 	u64 kstack;			/* Saved Kernel stack addr */
172 	u64 saved_r1;			/* r1 save for RTAS calls or PM or EE=0 */
173 	u64 saved_msr;			/* MSR saved here by enter_rtas */
174 #ifdef CONFIG_PPC64
175 	u64 exit_save_r1;		/* Syscall/interrupt R1 save */
176 #endif
177 #ifdef CONFIG_PPC_BOOK3E
178 	u16 trap_save;			/* Used when bad stack is encountered */
179 #endif
180 #ifdef CONFIG_PPC_BOOK3S_64
181 	u8 hsrr_valid;			/* HSRRs set for HRFID */
182 	u8 srr_valid;			/* SRRs set for RFID */
183 #endif
184 	u8 irq_soft_mask;		/* mask for irq soft masking */
185 	u8 irq_happened;		/* irq happened while soft-disabled */
186 	u8 irq_work_pending;		/* IRQ_WORK interrupt while soft-disable */
187 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
188 	u8 pmcregs_in_use;		/* pseries puts this in lppaca */
189 #endif
190 	u64 sprg_vdso;			/* Saved user-visible sprg */
191 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
192 	u64 tm_scratch;                 /* TM scratch area for reclaim */
193 #endif
194 
195 #ifdef CONFIG_PPC_POWERNV
196 	/* PowerNV idle fields */
197 	/* PNV_CORE_IDLE_* bits, all siblings work on thread 0 paca */
198 	unsigned long idle_state;
199 	union {
200 		/* P7/P8 specific fields */
201 		struct {
202 			/* PNV_THREAD_RUNNING/NAP/SLEEP	*/
203 			u8 thread_idle_state;
204 			/* Mask to denote subcore sibling threads */
205 			u8 subcore_sibling_mask;
206 		};
207 
208 		/* P9 specific fields */
209 		struct {
210 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
211 			/* The PSSCR value that the kernel requested before going to stop */
212 			u64 requested_psscr;
213 			/* Flag to request this thread not to stop */
214 			atomic_t dont_stop;
215 #endif
216 		};
217 	};
218 #endif
219 
220 #ifdef CONFIG_PPC_BOOK3S_64
221 	/* Non-maskable exceptions that are not performance critical */
222 	u64 exnmi[EX_SIZE];	/* used for system reset (nmi) */
223 	u64 exmc[EX_SIZE];	/* used for machine checks */
224 #endif
225 #ifdef CONFIG_PPC_BOOK3S_64
226 	/* Exclusive stacks for system reset and machine check exception. */
227 	void *nmi_emergency_sp;
228 	void *mc_emergency_sp;
229 
230 	u16 in_nmi;			/* In nmi handler */
231 
232 	/*
233 	 * Flag to check whether we are in machine check early handler
234 	 * and already using emergency stack.
235 	 */
236 	u16 in_mce;
237 	u8 hmi_event_available;		/* HMI event is available */
238 	u8 hmi_p9_special_emu;		/* HMI P9 special emulation */
239 	u32 hmi_irqs;			/* HMI irq stat */
240 #endif
241 	u8 ftrace_enabled;		/* Hard disable ftrace */
242 
243 	/* Stuff for accurate time accounting */
244 	struct cpu_accounting_data accounting;
245 	u64 dtl_ridx;			/* read index in dispatch log */
246 	struct dtl_entry *dtl_curr;	/* pointer corresponding to dtl_ridx */
247 
248 #ifdef CONFIG_KVM_BOOK3S_HANDLER
249 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
250 	/* We use this to store guest state in */
251 	struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
252 #endif
253 	struct kvmppc_host_state kvm_hstate;
254 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
255 	/*
256 	 * Bitmap for sibling subcore status. See kvm/book3s_hv_ras.c for
257 	 * more details
258 	 */
259 	struct sibling_subcore_state *sibling_subcore_state;
260 #endif
261 #endif
262 #ifdef CONFIG_PPC_BOOK3S_64
263 	/*
264 	 * rfi fallback flush must be in its own cacheline to prevent
265 	 * other paca data leaking into the L1d
266 	 */
267 	u64 exrfi[EX_SIZE] __aligned(0x80);
268 	void *rfi_flush_fallback_area;
269 	u64 l1d_flush_size;
270 #endif
271 #ifdef CONFIG_PPC_PSERIES
272 	struct rtas_args *rtas_args_reentrant;
273 	u8 *mce_data_buf;		/* buffer to hold per cpu rtas errlog */
274 #endif /* CONFIG_PPC_PSERIES */
275 
276 #ifdef CONFIG_PPC_BOOK3S_64
277 #ifdef CONFIG_PPC_64S_HASH_MMU
278 	/* Capture SLB related old contents in MCE handler. */
279 	struct slb_entry *mce_faulty_slbs;
280 	u16 slb_save_cache_ptr;
281 #endif
282 #endif /* CONFIG_PPC_BOOK3S_64 */
283 #ifdef CONFIG_STACKPROTECTOR
284 	unsigned long canary;
285 #endif
286 #ifdef CONFIG_MMIOWB
287 	struct mmiowb_state mmiowb_state;
288 #endif
289 #ifdef CONFIG_PPC_BOOK3S_64
290 	struct mce_info *mce_info;
291 	u8 mce_pending_irq_work;
292 #endif /* CONFIG_PPC_BOOK3S_64 */
293 } ____cacheline_aligned;
294 
295 extern void copy_mm_to_paca(struct mm_struct *mm);
296 extern struct paca_struct **paca_ptrs;
297 extern void initialise_paca(struct paca_struct *new_paca, int cpu);
298 extern void setup_paca(struct paca_struct *new_paca);
299 extern void allocate_paca_ptrs(void);
300 extern void allocate_paca(int cpu);
301 extern void free_unused_pacas(void);
302 
303 #else /* CONFIG_PPC64 */
304 
305 static inline void allocate_paca_ptrs(void) { }
306 static inline void allocate_paca(int cpu) { }
307 static inline void free_unused_pacas(void) { }
308 
309 #endif /* CONFIG_PPC64 */
310 
311 #endif /* __KERNEL__ */
312 #endif /* _ASM_POWERPC_PACA_H */
313