xref: /openbmc/linux/arch/powerpc/include/asm/paca.h (revision a36954f5)
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 exslb[13];		/* used for SLB/segment table misses
103  				 * on the linear mapping */
104 	/* SLB related definitions */
105 	u16 vmalloc_sllp;
106 	u16 slb_cache_ptr;
107 	u32 slb_cache[SLB_CACHE_ENTRIES];
108 #endif /* CONFIG_PPC_STD_MMU_64 */
109 
110 #ifdef CONFIG_PPC_BOOK3E
111 	u64 exgen[8] __aligned(0x40);
112 	/* Keep pgd in the same cacheline as the start of extlb */
113 	pgd_t *pgd __aligned(0x40); /* Current PGD */
114 	pgd_t *kernel_pgd;		/* Kernel PGD */
115 
116 	/* Shared by all threads of a core -- points to tcd of first thread */
117 	struct tlb_core_data *tcd_ptr;
118 
119 	/*
120 	 * We can have up to 3 levels of reentrancy in the TLB miss handler,
121 	 * in each of four exception levels (normal, crit, mcheck, debug).
122 	 */
123 	u64 extlb[12][EX_TLB_SIZE / sizeof(u64)];
124 	u64 exmc[8];		/* used for machine checks */
125 	u64 excrit[8];		/* used for crit interrupts */
126 	u64 exdbg[8];		/* used for debug interrupts */
127 
128 	/* Kernel stack pointers for use by special exceptions */
129 	void *mc_kstack;
130 	void *crit_kstack;
131 	void *dbg_kstack;
132 
133 	struct tlb_core_data tcd;
134 #endif /* CONFIG_PPC_BOOK3E */
135 
136 #ifdef CONFIG_PPC_BOOK3S
137 	mm_context_id_t mm_ctx_id;
138 #ifdef CONFIG_PPC_MM_SLICES
139 	u64 mm_ctx_low_slices_psize;
140 	unsigned char mm_ctx_high_slices_psize[SLICE_ARRAY_SIZE];
141 	unsigned long addr_limit;
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 	/*
176 	 * Pointer to an array which contains pointer
177 	 * to the sibling threads' paca.
178 	 */
179 	struct paca_struct **thread_sibling_pacas;
180 #endif
181 
182 #ifdef CONFIG_PPC_STD_MMU_64
183 	/* Non-maskable exceptions that are not performance critical */
184 	u64 exnmi[13];		/* used for system reset (nmi) */
185 	u64 exmc[13];		/* used for machine checks */
186 #endif
187 #ifdef CONFIG_PPC_BOOK3S_64
188 	/* Exclusive stacks for system reset and machine check exception. */
189 	void *nmi_emergency_sp;
190 	void *mc_emergency_sp;
191 
192 	u16 in_nmi;			/* In nmi handler */
193 
194 	/*
195 	 * Flag to check whether we are in machine check early handler
196 	 * and already using emergency stack.
197 	 */
198 	u16 in_mce;
199 	u8 hmi_event_available;		/* HMI event is available */
200 #endif
201 
202 	/* Stuff for accurate time accounting */
203 	struct cpu_accounting_data accounting;
204 	u64 dtl_ridx;			/* read index in dispatch log */
205 	struct dtl_entry *dtl_curr;	/* pointer corresponding to dtl_ridx */
206 
207 #ifdef CONFIG_KVM_BOOK3S_HANDLER
208 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
209 	/* We use this to store guest state in */
210 	struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
211 #endif
212 	struct kvmppc_host_state kvm_hstate;
213 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
214 	/*
215 	 * Bitmap for sibling subcore status. See kvm/book3s_hv_ras.c for
216 	 * more details
217 	 */
218 	struct sibling_subcore_state *sibling_subcore_state;
219 #endif
220 #endif
221 };
222 
223 extern void copy_mm_to_paca(struct mm_struct *mm);
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