xref: /openbmc/linux/arch/powerpc/include/asm/paca.h (revision 5d0e4d78)
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 #ifdef CONFIG_PPC_BOOK3E
25 #include <asm/exception-64e.h>
26 #else
27 #include <asm/exception-64s.h>
28 #endif
29 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
30 #include <asm/kvm_book3s_asm.h>
31 #endif
32 #include <asm/accounting.h>
33 #include <asm/hmi.h>
34 
35 register struct paca_struct *local_paca asm("r13");
36 
37 #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
38 extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
39 /*
40  * Add standard checks that preemption cannot occur when using get_paca():
41  * otherwise the paca_struct it points to may be the wrong one just after.
42  */
43 #define get_paca()	((void) debug_smp_processor_id(), local_paca)
44 #else
45 #define get_paca()	local_paca
46 #endif
47 
48 #define get_lppaca()	(get_paca()->lppaca_ptr)
49 #define get_slb_shadow()	(get_paca()->slb_shadow_ptr)
50 
51 struct task_struct;
52 
53 /*
54  * Defines the layout of the paca.
55  *
56  * This structure is not directly accessed by firmware or the service
57  * processor.
58  */
59 struct paca_struct {
60 #ifdef CONFIG_PPC_BOOK3S
61 	/*
62 	 * Because hw_cpu_id, unlike other paca fields, is accessed
63 	 * routinely from other CPUs (from the IRQ code), we stick to
64 	 * read-only (after boot) fields in the first cacheline to
65 	 * avoid cacheline bouncing.
66 	 */
67 
68 	struct lppaca *lppaca_ptr;	/* Pointer to LpPaca for PLIC */
69 #endif /* CONFIG_PPC_BOOK3S */
70 	/*
71 	 * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c
72 	 * load lock_token and paca_index with a single lwz
73 	 * instruction.  They must travel together and be properly
74 	 * aligned.
75 	 */
76 #ifdef __BIG_ENDIAN__
77 	u16 lock_token;			/* Constant 0x8000, used in locks */
78 	u16 paca_index;			/* Logical processor number */
79 #else
80 	u16 paca_index;			/* Logical processor number */
81 	u16 lock_token;			/* Constant 0x8000, used in locks */
82 #endif
83 
84 	u64 kernel_toc;			/* Kernel TOC address */
85 	u64 kernelbase;			/* Base address of kernel */
86 	u64 kernel_msr;			/* MSR while running in kernel */
87 	void *emergency_sp;		/* pointer to emergency stack */
88 	u64 data_offset;		/* per cpu data offset */
89 	s16 hw_cpu_id;			/* Physical processor number */
90 	u8 cpu_start;			/* At startup, processor spins until */
91 					/* this becomes non-zero. */
92 	u8 kexec_state;		/* set when kexec down has irqs off */
93 #ifdef CONFIG_PPC_STD_MMU_64
94 	struct slb_shadow *slb_shadow_ptr;
95 	struct dtl_entry *dispatch_log;
96 	struct dtl_entry *dispatch_log_end;
97 #endif /* CONFIG_PPC_STD_MMU_64 */
98 	u64 dscr_default;		/* per-CPU default DSCR */
99 
100 #ifdef CONFIG_PPC_STD_MMU_64
101 	/*
102 	 * Now, starting in cacheline 2, the exception save areas
103 	 */
104 	/* used for most interrupts/exceptions */
105 	u64 exgen[EX_SIZE] __attribute__((aligned(0x80)));
106 	u64 exslb[EX_SIZE];	/* used for SLB/segment table misses
107  				 * on the linear mapping */
108 	/* SLB related definitions */
109 	u16 vmalloc_sllp;
110 	u16 slb_cache_ptr;
111 	u32 slb_cache[SLB_CACHE_ENTRIES];
112 #endif /* CONFIG_PPC_STD_MMU_64 */
113 
114 #ifdef CONFIG_PPC_BOOK3E
115 	u64 exgen[8] __aligned(0x40);
116 	/* Keep pgd in the same cacheline as the start of extlb */
117 	pgd_t *pgd __aligned(0x40); /* Current PGD */
118 	pgd_t *kernel_pgd;		/* Kernel PGD */
119 
120 	/* Shared by all threads of a core -- points to tcd of first thread */
121 	struct tlb_core_data *tcd_ptr;
122 
123 	/*
124 	 * We can have up to 3 levels of reentrancy in the TLB miss handler,
125 	 * in each of four exception levels (normal, crit, mcheck, debug).
126 	 */
127 	u64 extlb[12][EX_TLB_SIZE / sizeof(u64)];
128 	u64 exmc[8];		/* used for machine checks */
129 	u64 excrit[8];		/* used for crit interrupts */
130 	u64 exdbg[8];		/* used for debug interrupts */
131 
132 	/* Kernel stack pointers for use by special exceptions */
133 	void *mc_kstack;
134 	void *crit_kstack;
135 	void *dbg_kstack;
136 
137 	struct tlb_core_data tcd;
138 #endif /* CONFIG_PPC_BOOK3E */
139 
140 #ifdef CONFIG_PPC_BOOK3S
141 	mm_context_id_t mm_ctx_id;
142 #ifdef CONFIG_PPC_MM_SLICES
143 	u64 mm_ctx_low_slices_psize;
144 	unsigned char mm_ctx_high_slices_psize[SLICE_ARRAY_SIZE];
145 	unsigned long addr_limit;
146 #else
147 	u16 mm_ctx_user_psize;
148 	u16 mm_ctx_sllp;
149 #endif
150 #endif
151 
152 	/*
153 	 * then miscellaneous read-write fields
154 	 */
155 	struct task_struct *__current;	/* Pointer to current */
156 	u64 kstack;			/* Saved Kernel stack addr */
157 	u64 stab_rr;			/* stab/slb round-robin counter */
158 	u64 saved_r1;			/* r1 save for RTAS calls or PM */
159 	u64 saved_msr;			/* MSR saved here by enter_rtas */
160 	u16 trap_save;			/* Used when bad stack is encountered */
161 	u8 soft_enabled;		/* irq soft-enable flag */
162 	u8 irq_happened;		/* irq happened while soft-disabled */
163 	u8 io_sync;			/* writel() needs spin_unlock sync */
164 	u8 irq_work_pending;		/* IRQ_WORK interrupt while soft-disable */
165 	u8 nap_state_lost;		/* NV GPR values lost in power7_idle */
166 	u64 sprg_vdso;			/* Saved user-visible sprg */
167 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
168 	u64 tm_scratch;                 /* TM scratch area for reclaim */
169 #endif
170 
171 #ifdef CONFIG_PPC_POWERNV
172 	/* Per-core mask tracking idle threads and a lock bit-[L][TTTTTTTT] */
173 	u32 *core_idle_state_ptr;
174 	u8 thread_idle_state;		/* PNV_THREAD_RUNNING/NAP/SLEEP	*/
175 	/* Mask to indicate thread id in core */
176 	u8 thread_mask;
177 	/* Mask to denote subcore sibling threads */
178 	u8 subcore_sibling_mask;
179 	/*
180 	 * Pointer to an array which contains pointer
181 	 * to the sibling threads' paca.
182 	 */
183 	struct paca_struct **thread_sibling_pacas;
184 	/* The PSSCR value that the kernel requested before going to stop */
185 	u64 requested_psscr;
186 #endif
187 
188 #ifdef CONFIG_PPC_STD_MMU_64
189 	/* Non-maskable exceptions that are not performance critical */
190 	u64 exnmi[EX_SIZE];	/* used for system reset (nmi) */
191 	u64 exmc[EX_SIZE];	/* used for machine checks */
192 #endif
193 #ifdef CONFIG_PPC_BOOK3S_64
194 	/* Exclusive stacks for system reset and machine check exception. */
195 	void *nmi_emergency_sp;
196 	void *mc_emergency_sp;
197 
198 	u16 in_nmi;			/* In nmi handler */
199 
200 	/*
201 	 * Flag to check whether we are in machine check early handler
202 	 * and already using emergency stack.
203 	 */
204 	u16 in_mce;
205 	u8 hmi_event_available;		/* HMI event is available */
206 #endif
207 
208 	/* Stuff for accurate time accounting */
209 	struct cpu_accounting_data accounting;
210 	u64 dtl_ridx;			/* read index in dispatch log */
211 	struct dtl_entry *dtl_curr;	/* pointer corresponding to dtl_ridx */
212 
213 #ifdef CONFIG_KVM_BOOK3S_HANDLER
214 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
215 	/* We use this to store guest state in */
216 	struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
217 #endif
218 	struct kvmppc_host_state kvm_hstate;
219 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
220 	/*
221 	 * Bitmap for sibling subcore status. See kvm/book3s_hv_ras.c for
222 	 * more details
223 	 */
224 	struct sibling_subcore_state *sibling_subcore_state;
225 #endif
226 #endif
227 };
228 
229 extern void copy_mm_to_paca(struct mm_struct *mm);
230 extern struct paca_struct *paca;
231 extern void initialise_paca(struct paca_struct *new_paca, int cpu);
232 extern void setup_paca(struct paca_struct *new_paca);
233 extern void allocate_pacas(void);
234 extern void free_unused_pacas(void);
235 
236 #else /* CONFIG_PPC64 */
237 
238 static inline void allocate_pacas(void) { };
239 static inline void free_unused_pacas(void) { };
240 
241 #endif /* CONFIG_PPC64 */
242 
243 #endif /* __KERNEL__ */
244 #endif /* _ASM_POWERPC_PACA_H */
245