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 28register struct paca_struct *local_paca asm("r13"); 29 30#if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP) 31extern 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 44struct task_struct; 45struct opal_machine_check_event; 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 */ 53struct 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] __attribute__((aligned(0x80))); 111 /* Keep pgd in the same cacheline as the start of extlb */ 112 pgd_t *pgd __attribute__((aligned(0x80))); /* 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 mm_context_t context; 136 137 /* 138 * then miscellaneous read-write fields 139 */ 140 struct task_struct *__current; /* Pointer to current */ 141 u64 kstack; /* Saved Kernel stack addr */ 142 u64 stab_rr; /* stab/slb round-robin counter */ 143 u64 saved_r1; /* r1 save for RTAS calls or PM */ 144 u64 saved_msr; /* MSR saved here by enter_rtas */ 145 u16 trap_save; /* Used when bad stack is encountered */ 146 u8 soft_enabled; /* irq soft-enable flag */ 147 u8 irq_happened; /* irq happened while soft-disabled */ 148 u8 io_sync; /* writel() needs spin_unlock sync */ 149 u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */ 150 u8 nap_state_lost; /* NV GPR values lost in power7_idle */ 151 u64 sprg_vdso; /* Saved user-visible sprg */ 152#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 153 u64 tm_scratch; /* TM scratch area for reclaim */ 154#endif 155 156#ifdef CONFIG_PPC_POWERNV 157 /* Pointer to OPAL machine check event structure set by the 158 * early exception handler for use by high level C handler 159 */ 160 struct opal_machine_check_event *opal_mc_evt; 161#endif 162#ifdef CONFIG_PPC_BOOK3S_64 163 /* Exclusive emergency stack pointer for machine check exception. */ 164 void *mc_emergency_sp; 165 /* 166 * Flag to check whether we are in machine check early handler 167 * and already using emergency stack. 168 */ 169 u16 in_mce; 170 u8 hmi_event_available; /* HMI event is available */ 171#endif 172 173 /* Stuff for accurate time accounting */ 174 u64 user_time; /* accumulated usermode TB ticks */ 175 u64 system_time; /* accumulated system TB ticks */ 176 u64 user_time_scaled; /* accumulated usermode SPURR ticks */ 177 u64 starttime; /* TB value snapshot */ 178 u64 starttime_user; /* TB value on exit to usermode */ 179 u64 startspurr; /* SPURR value snapshot */ 180 u64 utime_sspurr; /* ->user_time when ->startspurr set */ 181 u64 stolen_time; /* TB ticks taken by hypervisor */ 182 u64 dtl_ridx; /* read index in dispatch log */ 183 struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */ 184 185#ifdef CONFIG_KVM_BOOK3S_HANDLER 186#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE 187 /* We use this to store guest state in */ 188 struct kvmppc_book3s_shadow_vcpu shadow_vcpu; 189#endif 190 struct kvmppc_host_state kvm_hstate; 191#endif 192}; 193 194extern struct paca_struct *paca; 195extern void initialise_paca(struct paca_struct *new_paca, int cpu); 196extern void setup_paca(struct paca_struct *new_paca); 197extern void allocate_pacas(void); 198extern void free_unused_pacas(void); 199 200#else /* CONFIG_PPC64 */ 201 202static inline void allocate_pacas(void) { }; 203static inline void free_unused_pacas(void) { }; 204 205#endif /* CONFIG_PPC64 */ 206 207#endif /* __KERNEL__ */ 208#endif /* _ASM_POWERPC_PACA_H */ 209