xref: /openbmc/linux/arch/powerpc/include/asm/paca.h (revision 0edbfea5)
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 
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 
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] __aligned(0x40);
111 	/* Keep pgd in the same cacheline as the start of extlb */
112 	pgd_t *pgd __aligned(0x40); /* 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 #ifdef CONFIG_PPC_BOOK3S
136 	mm_context_id_t mm_ctx_id;
137 #ifdef CONFIG_PPC_MM_SLICES
138 	u64 mm_ctx_low_slices_psize;
139 	unsigned char mm_ctx_high_slices_psize[SLICE_ARRAY_SIZE];
140 #else
141 	u16 mm_ctx_user_psize;
142 	u16 mm_ctx_sllp;
143 #endif
144 #endif
145 
146 	/*
147 	 * then miscellaneous read-write fields
148 	 */
149 	struct task_struct *__current;	/* Pointer to current */
150 	u64 kstack;			/* Saved Kernel stack addr */
151 	u64 stab_rr;			/* stab/slb round-robin counter */
152 	u64 saved_r1;			/* r1 save for RTAS calls or PM */
153 	u64 saved_msr;			/* MSR saved here by enter_rtas */
154 	u16 trap_save;			/* Used when bad stack is encountered */
155 	u8 soft_enabled;		/* irq soft-enable flag */
156 	u8 irq_happened;		/* irq happened while soft-disabled */
157 	u8 io_sync;			/* writel() needs spin_unlock sync */
158 	u8 irq_work_pending;		/* IRQ_WORK interrupt while soft-disable */
159 	u8 nap_state_lost;		/* NV GPR values lost in power7_idle */
160 	u64 sprg_vdso;			/* Saved user-visible sprg */
161 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
162 	u64 tm_scratch;                 /* TM scratch area for reclaim */
163 #endif
164 
165 #ifdef CONFIG_PPC_POWERNV
166 	/* Per-core mask tracking idle threads and a lock bit-[L][TTTTTTTT] */
167 	u32 *core_idle_state_ptr;
168 	u8 thread_idle_state;		/* PNV_THREAD_RUNNING/NAP/SLEEP	*/
169 	/* Mask to indicate thread id in core */
170 	u8 thread_mask;
171 	/* Mask to denote subcore sibling threads */
172 	u8 subcore_sibling_mask;
173 #endif
174 
175 #ifdef CONFIG_PPC_BOOK3S_64
176 	/* Exclusive emergency stack pointer for machine check exception. */
177 	void *mc_emergency_sp;
178 	/*
179 	 * Flag to check whether we are in machine check early handler
180 	 * and already using emergency stack.
181 	 */
182 	u16 in_mce;
183 	u8 hmi_event_available;		 /* HMI event is available */
184 #endif
185 
186 	/* Stuff for accurate time accounting */
187 	u64 user_time;			/* accumulated usermode TB ticks */
188 	u64 system_time;		/* accumulated system TB ticks */
189 	u64 user_time_scaled;		/* accumulated usermode SPURR ticks */
190 	u64 starttime;			/* TB value snapshot */
191 	u64 starttime_user;		/* TB value on exit to usermode */
192 	u64 startspurr;			/* SPURR value snapshot */
193 	u64 utime_sspurr;		/* ->user_time when ->startspurr set */
194 	u64 stolen_time;		/* TB ticks taken by hypervisor */
195 	u64 dtl_ridx;			/* read index in dispatch log */
196 	struct dtl_entry *dtl_curr;	/* pointer corresponding to dtl_ridx */
197 
198 #ifdef CONFIG_KVM_BOOK3S_HANDLER
199 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
200 	/* We use this to store guest state in */
201 	struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
202 #endif
203 	struct kvmppc_host_state kvm_hstate;
204 #endif
205 };
206 
207 #ifdef CONFIG_PPC_BOOK3S
208 static inline void copy_mm_to_paca(mm_context_t *context)
209 {
210 	get_paca()->mm_ctx_id = context->id;
211 #ifdef CONFIG_PPC_MM_SLICES
212 	get_paca()->mm_ctx_low_slices_psize = context->low_slices_psize;
213 	memcpy(&get_paca()->mm_ctx_high_slices_psize,
214 	       &context->high_slices_psize, SLICE_ARRAY_SIZE);
215 #else
216 	get_paca()->mm_ctx_user_psize = context->user_psize;
217 	get_paca()->mm_ctx_sllp = context->sllp;
218 #endif
219 }
220 #else
221 static inline void copy_mm_to_paca(mm_context_t *context){}
222 #endif
223 
224 extern struct paca_struct *paca;
225 extern void initialise_paca(struct paca_struct *new_paca, int cpu);
226 extern void setup_paca(struct paca_struct *new_paca);
227 extern void allocate_pacas(void);
228 extern void free_unused_pacas(void);
229 
230 #else /* CONFIG_PPC64 */
231 
232 static inline void allocate_pacas(void) { };
233 static inline void free_unused_pacas(void) { };
234 
235 #endif /* CONFIG_PPC64 */
236 
237 #endif /* __KERNEL__ */
238 #endif /* _ASM_POWERPC_PACA_H */
239