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 <asm/types.h>
20 #include <asm/lppaca.h>
21 #include <asm/mmu.h>
22 #include <asm/page.h>
23 #include <asm/exception-64e.h>
24 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
25 #include <asm/kvm_book3s_asm.h>
26 #endif
27
28 register struct paca_struct *local_paca asm("r13");
29
30 #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
31 extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
32 /*
33 * Add standard checks that preemption cannot occur when using get_paca():
34 * otherwise the paca_struct it points to may be the wrong one just after.
35 */
36 #define get_paca() ((void) debug_smp_processor_id(), local_paca)
37 #else
38 #define get_paca() local_paca
39 #endif
40
41 #define get_lppaca() (get_paca()->lppaca_ptr)
42 #define get_slb_shadow() (get_paca()->slb_shadow_ptr)
43
44 struct task_struct;
45 struct opal_machine_check_event;
46
47 /*
48 * Defines the layout of the paca.
49 *
50 * This structure is not directly accessed by firmware or the service
51 * processor.
52 */
53 struct paca_struct {
54 #ifdef CONFIG_PPC_BOOK3S
55 /*
56 * Because hw_cpu_id, unlike other paca fields, is accessed
57 * routinely from other CPUs (from the IRQ code), we stick to
58 * read-only (after boot) fields in the first cacheline to
59 * avoid cacheline bouncing.
60 */
61
62 struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */
63 #endif /* CONFIG_PPC_BOOK3S */
64 /*
65 * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c
66 * load lock_token and paca_index with a single lwz
67 * instruction. They must travel together and be properly
68 * aligned.
69 */
70 #ifdef __BIG_ENDIAN__
71 u16 lock_token; /* Constant 0x8000, used in locks */
72 u16 paca_index; /* Logical processor number */
73 #else
74 u16 paca_index; /* Logical processor number */
75 u16 lock_token; /* Constant 0x8000, used in locks */
76 #endif
77
78 u64 kernel_toc; /* Kernel TOC address */
79 u64 kernelbase; /* Base address of kernel */
80 u64 kernel_msr; /* MSR while running in kernel */
81 void *emergency_sp; /* pointer to emergency stack */
82 u64 data_offset; /* per cpu data offset */
83 s16 hw_cpu_id; /* Physical processor number */
84 u8 cpu_start; /* At startup, processor spins until */
85 /* this becomes non-zero. */
86 u8 kexec_state; /* set when kexec down has irqs off */
87 #ifdef CONFIG_PPC_STD_MMU_64
88 struct slb_shadow *slb_shadow_ptr;
89 struct dtl_entry *dispatch_log;
90 struct dtl_entry *dispatch_log_end;
91 #endif /* CONFIG_PPC_STD_MMU_64 */
92 u64 dscr_default; /* per-CPU default DSCR */
93
94 #ifdef CONFIG_PPC_STD_MMU_64
95 /*
96 * Now, starting in cacheline 2, the exception save areas
97 */
98 /* used for most interrupts/exceptions */
99 u64 exgen[13] __attribute__((aligned(0x80)));
100 u64 exmc[13]; /* used for machine checks */
101 u64 exslb[13]; /* used for SLB/segment table misses
102 * on the linear mapping */
103 /* SLB related definitions */
104 u16 vmalloc_sllp;
105 u16 slb_cache_ptr;
106 u32 slb_cache[SLB_CACHE_ENTRIES];
107 #endif /* CONFIG_PPC_STD_MMU_64 */
108
109 #ifdef CONFIG_PPC_BOOK3E
110 u64 exgen[8] __attribute__((aligned(0x80)));
111 /* Keep pgd in the same cacheline as the start of extlb */
112 pgd_t *pgd __attribute__((aligned(0x80))); /* Current PGD */
113 pgd_t *kernel_pgd; /* Kernel PGD */
114
115 /* Shared by all threads of a core -- points to tcd of first thread */
116 struct tlb_core_data *tcd_ptr;
117
118 /*
119 * We can have up to 3 levels of reentrancy in the TLB miss handler,
120 * in each of four exception levels (normal, crit, mcheck, debug).
121 */
122 u64 extlb[12][EX_TLB_SIZE / sizeof(u64)];
123 u64 exmc[8]; /* used for machine checks */
124 u64 excrit[8]; /* used for crit interrupts */
125 u64 exdbg[8]; /* used for debug interrupts */
126
127 /* Kernel stack pointers for use by special exceptions */
128 void *mc_kstack;
129 void *crit_kstack;
130 void *dbg_kstack;
131
132 struct tlb_core_data tcd;
133 #endif /* CONFIG_PPC_BOOK3E */
134
135 mm_context_t context;
136
137 /*
138 * then miscellaneous read-write fields
139 */
140 struct task_struct *__current; /* Pointer to current */
141 u64 kstack; /* Saved Kernel stack addr */
142 u64 stab_rr; /* stab/slb round-robin counter */
143 u64 saved_r1; /* r1 save for RTAS calls or PM */
144 u64 saved_msr; /* MSR saved here by enter_rtas */
145 u16 trap_save; /* Used when bad stack is encountered */
146 u8 soft_enabled; /* irq soft-enable flag */
147 u8 irq_happened; /* irq happened while soft-disabled */
148 u8 io_sync; /* writel() needs spin_unlock sync */
149 u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */
150 u8 nap_state_lost; /* NV GPR values lost in power7_idle */
151 u64 sprg_vdso; /* Saved user-visible sprg */
152 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
153 u64 tm_scratch; /* TM scratch area for reclaim */
154 #endif
155
156 #ifdef CONFIG_PPC_POWERNV
157 /* Pointer to OPAL machine check event structure set by the
158 * early exception handler for use by high level C handler
159 */
160 struct opal_machine_check_event *opal_mc_evt;
161 #endif
162 #ifdef CONFIG_PPC_BOOK3S_64
163 /* Exclusive emergency stack pointer for machine check exception. */
164 void *mc_emergency_sp;
165 /*
166 * Flag to check whether we are in machine check early handler
167 * and already using emergency stack.
168 */
169 u16 in_mce;
170 u8 hmi_event_available; /* HMI event is available */
171 #endif
172
173 /* Stuff for accurate time accounting */
174 u64 user_time; /* accumulated usermode TB ticks */
175 u64 system_time; /* accumulated system TB ticks */
176 u64 user_time_scaled; /* accumulated usermode SPURR ticks */
177 u64 starttime; /* TB value snapshot */
178 u64 starttime_user; /* TB value on exit to usermode */
179 u64 startspurr; /* SPURR value snapshot */
180 u64 utime_sspurr; /* ->user_time when ->startspurr set */
181 u64 stolen_time; /* TB ticks taken by hypervisor */
182 u64 dtl_ridx; /* read index in dispatch log */
183 struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */
184
185 #ifdef CONFIG_KVM_BOOK3S_HANDLER
186 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
187 /* We use this to store guest state in */
188 struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
189 #endif
190 struct kvmppc_host_state kvm_hstate;
191 #endif
192 };
193
194 extern struct paca_struct *paca;
195 extern void initialise_paca(struct paca_struct *new_paca, int cpu);
196 extern void setup_paca(struct paca_struct *new_paca);
197 extern void allocate_pacas(void);
198 extern void free_unused_pacas(void);
199
200 #else /* CONFIG_PPC64 */
201
allocate_pacas(void)202 static inline void allocate_pacas(void) { };
free_unused_pacas(void)203 static inline void free_unused_pacas(void) { };
204
205 #endif /* CONFIG_PPC64 */
206
207 #endif /* __KERNEL__ */
208 #endif /* _ASM_POWERPC_PACA_H */
209