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.
6 * C 2001 PPC 64 Team, IBM Corp
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.
13 #ifndef _ASM_POWERPC_PACA_H
14 #define _ASM_POWERPC_PACA_H
19 #include <linux/string.h>
20 #include <asm/types.h>
21 #include <asm/lppaca.h>
24 #ifdef CONFIG_PPC_BOOK3E
25 #include <asm/exception-64e.h>
27 #include <asm/exception-64s.h>
29 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
30 #include <asm/kvm_book3s_asm.h>
32 #include <asm/accounting.h>
34 #include <asm/cpuidle.h>
35 #include <asm/atomic.h>
37 #include <asm-generic/mmiowb_types.h>
39 register struct paca_struct *local_paca asm("r13");
41 #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
42 extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
44 * Add standard checks that preemption cannot occur when using get_paca():
45 * otherwise the paca_struct it points to may be the wrong one just after.
47 #define get_paca() ((void) debug_smp_processor_id(), local_paca)
49 #define get_paca() local_paca
52 #ifdef CONFIG_PPC_PSERIES
53 #define get_lppaca() (get_paca()->lppaca_ptr)
56 #define get_slb_shadow() (get_paca()->slb_shadow_ptr)
61 * Defines the layout of the paca.
63 * This structure is not directly accessed by firmware or the service
67 #ifdef CONFIG_PPC_PSERIES
69 * Because hw_cpu_id, unlike other paca fields, is accessed
70 * routinely from other CPUs (from the IRQ code), we stick to
71 * read-only (after boot) fields in the first cacheline to
72 * avoid cacheline bouncing.
75 struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */
76 #endif /* CONFIG_PPC_PSERIES */
79 * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c
80 * load lock_token and paca_index with a single lwz
81 * instruction. They must travel together and be properly
85 u16 lock_token; /* Constant 0x8000, used in locks */
86 u16 paca_index; /* Logical processor number */
88 u16 paca_index; /* Logical processor number */
89 u16 lock_token; /* Constant 0x8000, used in locks */
92 u64 kernel_toc; /* Kernel TOC address */
93 u64 kernelbase; /* Base address of kernel */
94 u64 kernel_msr; /* MSR while running in kernel */
95 void *emergency_sp; /* pointer to emergency stack */
96 u64 data_offset; /* per cpu data offset */
97 s16 hw_cpu_id; /* Physical processor number */
98 u8 cpu_start; /* At startup, processor spins until */
99 /* this becomes non-zero. */
100 u8 kexec_state; /* set when kexec down has irqs off */
101 #ifdef CONFIG_PPC_BOOK3S_64
102 struct slb_shadow *slb_shadow_ptr;
103 struct dtl_entry *dispatch_log;
104 struct dtl_entry *dispatch_log_end;
106 u64 dscr_default; /* per-CPU default DSCR */
108 #ifdef CONFIG_PPC_BOOK3S_64
110 * Now, starting in cacheline 2, the exception save areas
112 /* used for most interrupts/exceptions */
113 u64 exgen[EX_SIZE] __attribute__((aligned(0x80)));
114 u64 exslb[EX_SIZE]; /* used for SLB/segment table misses
115 * on the linear mapping */
116 /* SLB related definitions */
119 u8 stab_rr; /* stab/slb round-robin counter */
120 #ifdef CONFIG_DEBUG_VM
121 u8 in_kernel_slb_handler;
123 u32 slb_used_bitmap; /* Bitmaps for first 32 SLB entries. */
125 u32 slb_cache[SLB_CACHE_ENTRIES];
126 #endif /* CONFIG_PPC_BOOK3S_64 */
128 #ifdef CONFIG_PPC_BOOK3E
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 */
134 /* Shared by all threads of a core -- points to tcd of first thread */
135 struct tlb_core_data *tcd_ptr;
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).
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 */
146 /* Kernel stack pointers for use by special exceptions */
151 struct tlb_core_data tcd;
152 #endif /* CONFIG_PPC_BOOK3E */
154 #ifdef CONFIG_PPC_BOOK3S
155 mm_context_id_t mm_ctx_id;
156 #ifdef CONFIG_PPC_MM_SLICES
157 unsigned char mm_ctx_low_slices_psize[BITS_PER_LONG / BITS_PER_BYTE];
158 unsigned char mm_ctx_high_slices_psize[SLICE_ARRAY_SIZE];
159 unsigned long mm_ctx_slb_addr_limit;
161 u16 mm_ctx_user_psize;
167 * then miscellaneous read-write fields
169 struct task_struct *__current; /* Pointer to current */
170 u64 kstack; /* Saved Kernel stack addr */
171 u64 saved_r1; /* r1 save for RTAS calls or PM or EE=0 */
172 u64 saved_msr; /* MSR saved here by enter_rtas */
173 u16 trap_save; /* Used when bad stack is encountered */
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 */
230 u8 ftrace_enabled; /* Hard disable ftrace */
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 */
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;
242 struct kvmppc_host_state kvm_hstate;
243 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
245 * Bitmap for sibling subcore status. See kvm/book3s_hv_ras.c for
248 struct sibling_subcore_state *sibling_subcore_state;
251 #ifdef CONFIG_PPC_BOOK3S_64
253 * rfi fallback flush must be in its own cacheline to prevent
254 * other paca data leaking into the L1d
256 u64 exrfi[EX_SIZE] __aligned(0x80);
257 void *rfi_flush_fallback_area;
260 #ifdef CONFIG_PPC_PSERIES
261 u8 *mce_data_buf; /* buffer to hold per cpu rtas errlog */
262 #endif /* CONFIG_PPC_PSERIES */
264 #ifdef CONFIG_PPC_BOOK3S_64
265 /* Capture SLB related old contents in MCE handler. */
266 struct slb_entry *mce_faulty_slbs;
267 u16 slb_save_cache_ptr;
268 #endif /* CONFIG_PPC_BOOK3S_64 */
269 #ifdef CONFIG_STACKPROTECTOR
270 unsigned long canary;
273 struct mmiowb_state mmiowb_state;
275 } ____cacheline_aligned;
277 extern void copy_mm_to_paca(struct mm_struct *mm);
278 extern struct paca_struct **paca_ptrs;
279 extern void initialise_paca(struct paca_struct *new_paca, int cpu);
280 extern void setup_paca(struct paca_struct *new_paca);
281 extern void allocate_paca_ptrs(void);
282 extern void allocate_paca(int cpu);
283 extern void free_unused_pacas(void);
285 #else /* CONFIG_PPC64 */
287 static inline void allocate_paca_ptrs(void) { };
288 static inline void allocate_paca(int cpu) { };
289 static inline void free_unused_pacas(void) { };
291 #endif /* CONFIG_PPC64 */
293 #endif /* __KERNEL__ */
294 #endif /* _ASM_POWERPC_PACA_H */