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/init.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
29 register struct paca_struct *local_paca asm("r13");
30
31 #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
32 extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
33 /*
34 * Add standard checks that preemption cannot occur when using get_paca():
35 * otherwise the paca_struct it points to may be the wrong one just after.
36 */
37 #define get_paca() ((void) debug_smp_processor_id(), local_paca)
38 #else
39 #define get_paca() local_paca
40 #endif
41
42 #define get_lppaca() (get_paca()->lppaca_ptr)
43 #define get_slb_shadow() (get_paca()->slb_shadow_ptr)
44
45 struct task_struct;
46 struct opal_machine_check_event;
47
48 /*
49 * Defines the layout of the paca.
50 *
51 * This structure is not directly accessed by firmware or the service
52 * processor.
53 */
54 struct paca_struct {
55 #ifdef CONFIG_PPC_BOOK3S
56 /*
57 * Because hw_cpu_id, unlike other paca fields, is accessed
58 * routinely from other CPUs (from the IRQ code), we stick to
59 * read-only (after boot) fields in the first cacheline to
60 * avoid cacheline bouncing.
61 */
62
63 struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */
64 #endif /* CONFIG_PPC_BOOK3S */
65 /*
66 * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c
67 * load lock_token and paca_index with a single lwz
68 * instruction. They must travel together and be properly
69 * aligned.
70 */
71 u16 lock_token; /* Constant 0x8000, used in locks */
72 u16 paca_index; /* Logical processor number */
73
74 u64 kernel_toc; /* Kernel TOC address */
75 u64 kernelbase; /* Base address of kernel */
76 u64 kernel_msr; /* MSR while running in kernel */
77 #ifdef CONFIG_PPC_STD_MMU_64
78 u64 stab_real; /* Absolute address of segment table */
79 u64 stab_addr; /* Virtual address of segment table */
80 #endif /* CONFIG_PPC_STD_MMU_64 */
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
92 /*
93 * Now, starting in cacheline 2, the exception save areas
94 */
95 /* used for most interrupts/exceptions */
96 u64 exgen[12] __attribute__((aligned(0x80)));
97 u64 exmc[12]; /* used for machine checks */
98 u64 exslb[12]; /* used for SLB/segment table misses
99 * on the linear mapping */
100 /* SLB related definitions */
101 u16 vmalloc_sllp;
102 u16 slb_cache_ptr;
103 u32 slb_cache[SLB_CACHE_ENTRIES];
104 #endif /* CONFIG_PPC_STD_MMU_64 */
105
106 #ifdef CONFIG_PPC_BOOK3E
107 u64 exgen[8] __attribute__((aligned(0x80)));
108 /* Keep pgd in the same cacheline as the start of extlb */
109 pgd_t *pgd __attribute__((aligned(0x80))); /* Current PGD */
110 pgd_t *kernel_pgd; /* Kernel PGD */
111 /* We can have up to 3 levels of reentrancy in the TLB miss handler */
112 u64 extlb[3][EX_TLB_SIZE / sizeof(u64)];
113 u64 exmc[8]; /* used for machine checks */
114 u64 excrit[8]; /* used for crit interrupts */
115 u64 exdbg[8]; /* used for debug interrupts */
116
117 /* Kernel stack pointers for use by special exceptions */
118 void *mc_kstack;
119 void *crit_kstack;
120 void *dbg_kstack;
121 #endif /* CONFIG_PPC_BOOK3E */
122
123 mm_context_t context;
124
125 /*
126 * then miscellaneous read-write fields
127 */
128 struct task_struct *__current; /* Pointer to current */
129 u64 kstack; /* Saved Kernel stack addr */
130 u64 stab_rr; /* stab/slb round-robin counter */
131 u64 saved_r1; /* r1 save for RTAS calls or PM */
132 u64 saved_msr; /* MSR saved here by enter_rtas */
133 u16 trap_save; /* Used when bad stack is encountered */
134 u8 soft_enabled; /* irq soft-enable flag */
135 u8 irq_happened; /* irq happened while soft-disabled */
136 u8 io_sync; /* writel() needs spin_unlock sync */
137 u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */
138 u8 nap_state_lost; /* NV GPR values lost in power7_idle */
139 u64 sprg3; /* Saved user-visible sprg */
140 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
141 u64 tm_scratch; /* TM scratch area for reclaim */
142 #endif
143
144 #ifdef CONFIG_PPC_POWERNV
145 /* Pointer to OPAL machine check event structure set by the
146 * early exception handler for use by high level C handler
147 */
148 struct opal_machine_check_event *opal_mc_evt;
149 #endif
150
151 /* Stuff for accurate time accounting */
152 u64 user_time; /* accumulated usermode TB ticks */
153 u64 system_time; /* accumulated system TB ticks */
154 u64 user_time_scaled; /* accumulated usermode SPURR ticks */
155 u64 starttime; /* TB value snapshot */
156 u64 starttime_user; /* TB value on exit to usermode */
157 u64 startspurr; /* SPURR value snapshot */
158 u64 utime_sspurr; /* ->user_time when ->startspurr set */
159 u64 stolen_time; /* TB ticks taken by hypervisor */
160 u64 dtl_ridx; /* read index in dispatch log */
161 struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */
162
163 #ifdef CONFIG_KVM_BOOK3S_HANDLER
164 #ifdef CONFIG_KVM_BOOK3S_PR
165 /* We use this to store guest state in */
166 struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
167 #endif
168 struct kvmppc_host_state kvm_hstate;
169 #endif
170 };
171
172 extern struct paca_struct *paca;
173 extern void initialise_paca(struct paca_struct *new_paca, int cpu);
174 extern void setup_paca(struct paca_struct *new_paca);
175 extern void allocate_pacas(void);
176 extern void free_unused_pacas(void);
177
178 #else /* CONFIG_PPC64 */
179
allocate_pacas(void)180 static inline void allocate_pacas(void) { };
free_unused_pacas(void)181 static inline void free_unused_pacas(void) { };
182
183 #endif /* CONFIG_PPC64 */
184
185 #endif /* __KERNEL__ */
186 #endif /* _ASM_POWERPC_PACA_H */
187