1 /* SPDX-License-Identifier: GPL-2.0-or-later */
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.
7 * C 2001 PPC 64 Team, IBM Corp
9 #ifndef _ASM_POWERPC_PACA_H
10 #define _ASM_POWERPC_PACA_H
15 #include <linux/string.h>
16 #include <asm/types.h>
17 #include <asm/lppaca.h>
20 #ifdef CONFIG_PPC_BOOK3E
21 #include <asm/exception-64e.h>
23 #include <asm/exception-64s.h>
25 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
26 #include <asm/kvm_book3s_asm.h>
28 #include <asm/accounting.h>
30 #include <asm/cpuidle.h>
31 #include <asm/atomic.h>
33 #include <asm-generic/mmiowb_types.h>
35 register struct paca_struct
*local_paca
asm("r13");
37 #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
38 extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
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.
43 #define get_paca() ((void) debug_smp_processor_id(), local_paca)
45 #define get_paca() local_paca
48 #ifdef CONFIG_PPC_PSERIES
49 #define get_lppaca() (get_paca()->lppaca_ptr)
52 #define get_slb_shadow() (get_paca()->slb_shadow_ptr)
57 * Defines the layout of the paca.
59 * This structure is not directly accessed by firmware or the service
63 #ifdef CONFIG_PPC_PSERIES
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.
71 struct lppaca
*lppaca_ptr
; /* Pointer to LpPaca for PLIC */
72 #endif /* CONFIG_PPC_PSERIES */
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
81 u16 lock_token
; /* Constant 0x8000, used in locks */
82 u16 paca_index
; /* Logical processor number */
84 u16 paca_index
; /* Logical processor number */
85 u16 lock_token
; /* Constant 0x8000, used in locks */
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
;
102 u64 dscr_default
; /* per-CPU default DSCR */
104 #ifdef CONFIG_PPC_BOOK3S_64
106 * Now, starting in cacheline 2, the exception save areas
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 */
115 u8 stab_rr
; /* stab/slb round-robin counter */
116 #ifdef CONFIG_DEBUG_VM
117 u8 in_kernel_slb_handler
;
119 u32 slb_used_bitmap
; /* Bitmaps for first 32 SLB entries. */
121 u32 slb_cache
[SLB_CACHE_ENTRIES
];
122 #endif /* CONFIG_PPC_BOOK3S_64 */
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 */
130 /* Shared by all threads of a core -- points to tcd of first thread */
131 struct tlb_core_data
*tcd_ptr
;
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).
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 */
142 /* Kernel stack pointers for use by special exceptions */
147 struct tlb_core_data tcd
;
148 #endif /* CONFIG_PPC_BOOK3E */
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
;
157 u16 mm_ctx_user_psize
;
163 * then miscellaneous read-write fields
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 */
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 */
178 u64 sprg_vdso
; /* Saved user-visible sprg */
179 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
180 u64 tm_scratch
; /* TM scratch area for reclaim */
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
;
188 /* P7/P8 specific fields */
190 /* PNV_THREAD_RUNNING/NAP/SLEEP */
191 u8 thread_idle_state
;
192 /* Mask to denote subcore sibling threads */
193 u8 subcore_sibling_mask
;
196 /* P9 specific fields */
198 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
199 /* The PSSCR value that the kernel requested before going to stop */
201 /* Flag to request this thread not to stop */
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 */
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
;
218 u16 in_nmi
; /* In nmi handler */
221 * Flag to check whether we are in machine check early handler
222 * and already using emergency stack.
225 u8 hmi_event_available
; /* HMI event is available */
226 u8 hmi_p9_special_emu
; /* HMI P9 special emulation */
228 u8 ftrace_enabled
; /* Hard disable ftrace */
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 */
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
;
240 struct kvmppc_host_state kvm_hstate
;
241 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
243 * Bitmap for sibling subcore status. See kvm/book3s_hv_ras.c for
246 struct sibling_subcore_state
*sibling_subcore_state
;
249 #ifdef CONFIG_PPC_BOOK3S_64
251 * rfi fallback flush must be in its own cacheline to prevent
252 * other paca data leaking into the L1d
254 u64 exrfi
[EX_SIZE
] __aligned(0x80);
255 void *rfi_flush_fallback_area
;
258 #ifdef CONFIG_PPC_PSERIES
259 u8
*mce_data_buf
; /* buffer to hold per cpu rtas errlog */
260 #endif /* CONFIG_PPC_PSERIES */
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
;
271 struct mmiowb_state mmiowb_state
;
273 } ____cacheline_aligned
;
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);
283 #else /* CONFIG_PPC64 */
285 static inline void allocate_paca_ptrs(void) { };
286 static inline void allocate_paca(int cpu
) { };
287 static inline void free_unused_pacas(void) { };
289 #endif /* CONFIG_PPC64 */
291 #endif /* __KERNEL__ */
292 #endif /* _ASM_POWERPC_PACA_H */