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Linux/arch/powerpc/include/asm/paca.h

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  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 
 46 /*
 47  * Defines the layout of the paca.
 48  *
 49  * This structure is not directly accessed by firmware or the service
 50  * processor.
 51  */
 52 struct paca_struct {
 53 #ifdef CONFIG_PPC_BOOK3S
 54         /*
 55          * Because hw_cpu_id, unlike other paca fields, is accessed
 56          * routinely from other CPUs (from the IRQ code), we stick to
 57          * read-only (after boot) fields in the first cacheline to
 58          * avoid cacheline bouncing.
 59          */
 60 
 61         struct lppaca *lppaca_ptr;      /* Pointer to LpPaca for PLIC */
 62 #endif /* CONFIG_PPC_BOOK3S */
 63         /*
 64          * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c 
 65          * load lock_token and paca_index with a single lwz
 66          * instruction.  They must travel together and be properly
 67          * aligned.
 68          */
 69 #ifdef __BIG_ENDIAN__
 70         u16 lock_token;                 /* Constant 0x8000, used in locks */
 71         u16 paca_index;                 /* Logical processor number */
 72 #else
 73         u16 paca_index;                 /* Logical processor number */
 74         u16 lock_token;                 /* Constant 0x8000, used in locks */
 75 #endif
 76 
 77         u64 kernel_toc;                 /* Kernel TOC address */
 78         u64 kernelbase;                 /* Base address of kernel */
 79         u64 kernel_msr;                 /* MSR while running in kernel */
 80         void *emergency_sp;             /* pointer to emergency stack */
 81         u64 data_offset;                /* per cpu data offset */
 82         s16 hw_cpu_id;                  /* Physical processor number */
 83         u8 cpu_start;                   /* At startup, processor spins until */
 84                                         /* this becomes non-zero. */
 85         u8 kexec_state;         /* set when kexec down has irqs off */
 86 #ifdef CONFIG_PPC_STD_MMU_64
 87         struct slb_shadow *slb_shadow_ptr;
 88         struct dtl_entry *dispatch_log;
 89         struct dtl_entry *dispatch_log_end;
 90 #endif /* CONFIG_PPC_STD_MMU_64 */
 91         u64 dscr_default;               /* per-CPU default DSCR */
 92 
 93 #ifdef CONFIG_PPC_STD_MMU_64
 94         /*
 95          * Now, starting in cacheline 2, the exception save areas
 96          */
 97         /* used for most interrupts/exceptions */
 98         u64 exgen[13] __attribute__((aligned(0x80)));
 99         u64 exmc[13];           /* used for machine checks */
100         u64 exslb[13];          /* used for SLB/segment table misses
101                                  * on the linear mapping */
102         /* SLB related definitions */
103         u16 vmalloc_sllp;
104         u16 slb_cache_ptr;
105         u32 slb_cache[SLB_CACHE_ENTRIES];
106 #endif /* CONFIG_PPC_STD_MMU_64 */
107 
108 #ifdef CONFIG_PPC_BOOK3E
109         u64 exgen[8] __aligned(0x40);
110         /* Keep pgd in the same cacheline as the start of extlb */
111         pgd_t *pgd __aligned(0x40); /* Current PGD */
112         pgd_t *kernel_pgd;              /* Kernel PGD */
113 
114         /* Shared by all threads of a core -- points to tcd of first thread */
115         struct tlb_core_data *tcd_ptr;
116 
117         /*
118          * We can have up to 3 levels of reentrancy in the TLB miss handler,
119          * in each of four exception levels (normal, crit, mcheck, debug).
120          */
121         u64 extlb[12][EX_TLB_SIZE / sizeof(u64)];
122         u64 exmc[8];            /* used for machine checks */
123         u64 excrit[8];          /* used for crit interrupts */
124         u64 exdbg[8];           /* used for debug interrupts */
125 
126         /* Kernel stack pointers for use by special exceptions */
127         void *mc_kstack;
128         void *crit_kstack;
129         void *dbg_kstack;
130 
131         struct tlb_core_data tcd;
132 #endif /* CONFIG_PPC_BOOK3E */
133 
134         mm_context_t context;
135 
136         /*
137          * then miscellaneous read-write fields
138          */
139         struct task_struct *__current;  /* Pointer to current */
140         u64 kstack;                     /* Saved Kernel stack addr */
141         u64 stab_rr;                    /* stab/slb round-robin counter */
142         u64 saved_r1;                   /* r1 save for RTAS calls or PM */
143         u64 saved_msr;                  /* MSR saved here by enter_rtas */
144         u16 trap_save;                  /* Used when bad stack is encountered */
145         u8 soft_enabled;                /* irq soft-enable flag */
146         u8 irq_happened;                /* irq happened while soft-disabled */
147         u8 io_sync;                     /* writel() needs spin_unlock sync */
148         u8 irq_work_pending;            /* IRQ_WORK interrupt while soft-disable */
149         u8 nap_state_lost;              /* NV GPR values lost in power7_idle */
150         u64 sprg_vdso;                  /* Saved user-visible sprg */
151 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
152         u64 tm_scratch;                 /* TM scratch area for reclaim */
153 #endif
154 
155 #ifdef CONFIG_PPC_POWERNV
156         /* Per-core mask tracking idle threads and a lock bit-[L][TTTTTTTT] */
157         u32 *core_idle_state_ptr;
158         u8 thread_idle_state;           /* PNV_THREAD_RUNNING/NAP/SLEEP */
159         /* Mask to indicate thread id in core */
160         u8 thread_mask;
161         /* Mask to denote subcore sibling threads */
162         u8 subcore_sibling_mask;
163 #endif
164 
165 #ifdef CONFIG_PPC_BOOK3S_64
166         /* Exclusive emergency stack pointer for machine check exception. */
167         void *mc_emergency_sp;
168         /*
169          * Flag to check whether we are in machine check early handler
170          * and already using emergency stack.
171          */
172         u16 in_mce;
173         u8 hmi_event_available;          /* HMI event is available */
174 #endif
175 
176         /* Stuff for accurate time accounting */
177         u64 user_time;                  /* accumulated usermode TB ticks */
178         u64 system_time;                /* accumulated system TB ticks */
179         u64 user_time_scaled;           /* accumulated usermode SPURR ticks */
180         u64 starttime;                  /* TB value snapshot */
181         u64 starttime_user;             /* TB value on exit to usermode */
182         u64 startspurr;                 /* SPURR value snapshot */
183         u64 utime_sspurr;               /* ->user_time when ->startspurr set */
184         u64 stolen_time;                /* TB ticks taken by hypervisor */
185         u64 dtl_ridx;                   /* read index in dispatch log */
186         struct dtl_entry *dtl_curr;     /* pointer corresponding to dtl_ridx */
187 
188 #ifdef CONFIG_KVM_BOOK3S_HANDLER
189 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
190         /* We use this to store guest state in */
191         struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
192 #endif
193         struct kvmppc_host_state kvm_hstate;
194 #endif
195 };
196 
197 extern struct paca_struct *paca;
198 extern void initialise_paca(struct paca_struct *new_paca, int cpu);
199 extern void setup_paca(struct paca_struct *new_paca);
200 extern void allocate_pacas(void);
201 extern void free_unused_pacas(void);
202 
203 #else /* CONFIG_PPC64 */
204 
205 static inline void allocate_pacas(void) { };
206 static inline void free_unused_pacas(void) { };
207 
208 #endif /* CONFIG_PPC64 */
209 
210 #endif /* __KERNEL__ */
211 #endif /* _ASM_POWERPC_PACA_H */
212 

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