1 /*
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.
5 *
6 * C 2001 PPC 64 Team, IBM Corp
7 *
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.
12 */
13 #ifndef _ASM_POWERPC_PACA_H
14 #define _ASM_POWERPC_PACA_H
15 #ifdef __KERNEL__
16
17 #ifdef CONFIG_PPC64
18
19 #include <linux/string.h>
20 #include <asm/types.h>
21 #include <asm/lppaca.h>
22 #include <asm/mmu.h>
23 #include <asm/page.h>
24 #include <asm/exception-64e.h>
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
31 register struct paca_struct *local_paca asm("r13");
32
33 #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
34 extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
35 /*
36 * Add standard checks that preemption cannot occur when using get_paca():
37 * otherwise the paca_struct it points to may be the wrong one just after.
38 */
39 #define get_paca() ((void) debug_smp_processor_id(), local_paca)
40 #else
41 #define get_paca() local_paca
42 #endif
43
44 #define get_lppaca() (get_paca()->lppaca_ptr)
45 #define get_slb_shadow() (get_paca()->slb_shadow_ptr)
46
47 struct task_struct;
48
49 /*
50 * Defines the layout of the paca.
51 *
52 * This structure is not directly accessed by firmware or the service
53 * processor.
54 */
55 struct paca_struct {
56 #ifdef CONFIG_PPC_BOOK3S
57 /*
58 * Because hw_cpu_id, unlike other paca fields, is accessed
59 * routinely from other CPUs (from the IRQ code), we stick to
60 * read-only (after boot) fields in the first cacheline to
61 * avoid cacheline bouncing.
62 */
63
64 struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */
65 #endif /* CONFIG_PPC_BOOK3S */
66 /*
67 * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c
68 * load lock_token and paca_index with a single lwz
69 * instruction. They must travel together and be properly
70 * aligned.
71 */
72 #ifdef __BIG_ENDIAN__
73 u16 lock_token; /* Constant 0x8000, used in locks */
74 u16 paca_index; /* Logical processor number */
75 #else
76 u16 paca_index; /* Logical processor number */
77 u16 lock_token; /* Constant 0x8000, used in locks */
78 #endif
79
80 u64 kernel_toc; /* Kernel TOC address */
81 u64 kernelbase; /* Base address of kernel */
82 u64 kernel_msr; /* MSR while running in kernel */
83 void *emergency_sp; /* pointer to emergency stack */
84 u64 data_offset; /* per cpu data offset */
85 s16 hw_cpu_id; /* Physical processor number */
86 u8 cpu_start; /* At startup, processor spins until */
87 /* this becomes non-zero. */
88 u8 kexec_state; /* set when kexec down has irqs off */
89 #ifdef CONFIG_PPC_STD_MMU_64
90 struct slb_shadow *slb_shadow_ptr;
91 struct dtl_entry *dispatch_log;
92 struct dtl_entry *dispatch_log_end;
93 #endif /* CONFIG_PPC_STD_MMU_64 */
94 u64 dscr_default; /* per-CPU default DSCR */
95
96 #ifdef CONFIG_PPC_STD_MMU_64
97 /*
98 * Now, starting in cacheline 2, the exception save areas
99 */
100 /* used for most interrupts/exceptions */
101 u64 exgen[13] __attribute__((aligned(0x80)));
102 u64 exmc[13]; /* used for machine checks */
103 u64 exslb[13]; /* used for SLB/segment table misses
104 * on the linear mapping */
105 /* SLB related definitions */
106 u16 vmalloc_sllp;
107 u16 slb_cache_ptr;
108 u32 slb_cache[SLB_CACHE_ENTRIES];
109 #endif /* CONFIG_PPC_STD_MMU_64 */
110
111 #ifdef CONFIG_PPC_BOOK3E
112 u64 exgen[8] __aligned(0x40);
113 /* Keep pgd in the same cacheline as the start of extlb */
114 pgd_t *pgd __aligned(0x40); /* Current PGD */
115 pgd_t *kernel_pgd; /* Kernel PGD */
116
117 /* Shared by all threads of a core -- points to tcd of first thread */
118 struct tlb_core_data *tcd_ptr;
119
120 /*
121 * We can have up to 3 levels of reentrancy in the TLB miss handler,
122 * in each of four exception levels (normal, crit, mcheck, debug).
123 */
124 u64 extlb[12][EX_TLB_SIZE / sizeof(u64)];
125 u64 exmc[8]; /* used for machine checks */
126 u64 excrit[8]; /* used for crit interrupts */
127 u64 exdbg[8]; /* used for debug interrupts */
128
129 /* Kernel stack pointers for use by special exceptions */
130 void *mc_kstack;
131 void *crit_kstack;
132 void *dbg_kstack;
133
134 struct tlb_core_data tcd;
135 #endif /* CONFIG_PPC_BOOK3E */
136
137 #ifdef CONFIG_PPC_BOOK3S
138 mm_context_id_t mm_ctx_id;
139 #ifdef CONFIG_PPC_MM_SLICES
140 u64 mm_ctx_low_slices_psize;
141 unsigned char mm_ctx_high_slices_psize[SLICE_ARRAY_SIZE];
142 #else
143 u16 mm_ctx_user_psize;
144 u16 mm_ctx_sllp;
145 #endif
146 #endif
147
148 /*
149 * then miscellaneous read-write fields
150 */
151 struct task_struct *__current; /* Pointer to current */
152 u64 kstack; /* Saved Kernel stack addr */
153 u64 stab_rr; /* stab/slb round-robin counter */
154 u64 saved_r1; /* r1 save for RTAS calls or PM */
155 u64 saved_msr; /* MSR saved here by enter_rtas */
156 u16 trap_save; /* Used when bad stack is encountered */
157 u8 soft_enabled; /* irq soft-enable flag */
158 u8 irq_happened; /* irq happened while soft-disabled */
159 u8 io_sync; /* writel() needs spin_unlock sync */
160 u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */
161 u8 nap_state_lost; /* NV GPR values lost in power7_idle */
162 u64 sprg_vdso; /* Saved user-visible sprg */
163 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
164 u64 tm_scratch; /* TM scratch area for reclaim */
165 #endif
166
167 #ifdef CONFIG_PPC_POWERNV
168 /* Per-core mask tracking idle threads and a lock bit-[L][TTTTTTTT] */
169 u32 *core_idle_state_ptr;
170 u8 thread_idle_state; /* PNV_THREAD_RUNNING/NAP/SLEEP */
171 /* Mask to indicate thread id in core */
172 u8 thread_mask;
173 /* Mask to denote subcore sibling threads */
174 u8 subcore_sibling_mask;
175 #endif
176
177 #ifdef CONFIG_PPC_BOOK3S_64
178 /* Exclusive emergency stack pointer for machine check exception. */
179 void *mc_emergency_sp;
180 /*
181 * Flag to check whether we are in machine check early handler
182 * and already using emergency stack.
183 */
184 u16 in_mce;
185 u8 hmi_event_available; /* HMI event is available */
186 #endif
187
188 /* Stuff for accurate time accounting */
189 struct cpu_accounting_data accounting;
190 u64 stolen_time; /* TB ticks taken by hypervisor */
191 u64 dtl_ridx; /* read index in dispatch log */
192 struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */
193
194 #ifdef CONFIG_KVM_BOOK3S_HANDLER
195 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
196 /* We use this to store guest state in */
197 struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
198 #endif
199 struct kvmppc_host_state kvm_hstate;
200 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
201 /*
202 * Bitmap for sibling subcore status. See kvm/book3s_hv_ras.c for
203 * more details
204 */
205 struct sibling_subcore_state *sibling_subcore_state;
206 #endif
207 #endif
208 #ifdef CONFIG_PPC_BOOK3S_64
209 /*
210 * rfi fallback flush must be in its own cacheline to prevent
211 * other paca data leaking into the L1d
212 */
213 u64 exrfi[13] __aligned(0x80);
214 void *rfi_flush_fallback_area;
215 u64 l1d_flush_size;
216 #endif
217 };
218
219 #ifdef CONFIG_PPC_BOOK3S
copy_mm_to_paca(mm_context_t * context)220 static inline void copy_mm_to_paca(mm_context_t *context)
221 {
222 get_paca()->mm_ctx_id = context->id;
223 #ifdef CONFIG_PPC_MM_SLICES
224 get_paca()->mm_ctx_low_slices_psize = context->low_slices_psize;
225 memcpy(&get_paca()->mm_ctx_high_slices_psize,
226 &context->high_slices_psize, SLICE_ARRAY_SIZE);
227 #else
228 get_paca()->mm_ctx_user_psize = context->user_psize;
229 get_paca()->mm_ctx_sllp = context->sllp;
230 #endif
231 }
232 #else
copy_mm_to_paca(mm_context_t * context)233 static inline void copy_mm_to_paca(mm_context_t *context){}
234 #endif
235
236 extern struct paca_struct *paca;
237 extern void initialise_paca(struct paca_struct *new_paca, int cpu);
238 extern void setup_paca(struct paca_struct *new_paca);
239 extern void allocate_pacas(void);
240 extern void free_unused_pacas(void);
241
242 #else /* CONFIG_PPC64 */
243
allocate_pacas(void)244 static inline void allocate_pacas(void) { };
free_unused_pacas(void)245 static inline void free_unused_pacas(void) { };
246
247 #endif /* CONFIG_PPC64 */
248
249 #endif /* __KERNEL__ */
250 #endif /* _ASM_POWERPC_PACA_H */
251