1 /* 2 * lppaca.h 3 * Copyright (C) 2001 Mike Corrigan IBM Corporation 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 */ 19 #ifndef _ASM_POWERPC_LPPACA_H 20 #define _ASM_POWERPC_LPPACA_H 21 #ifdef __KERNEL__ 22 23 /* 24 * These definitions relate to hypervisors that only exist when using 25 * a server type processor 26 */ 27 #ifdef CONFIG_PPC_BOOK3S 28 29 /* 30 * This control block contains the data that is shared between the 31 * hypervisor and the OS. 32 */ 33 #include <linux/cache.h> 34 #include <linux/threads.h> 35 #include <asm/types.h> 36 #include <asm/mmu.h> 37 #include <asm/firmware.h> 38 39 /* 40 * The lppaca is the "virtual processor area" registered with the hypervisor, 41 * H_REGISTER_VPA etc. 42 * 43 * According to PAPR, the structure is 640 bytes long, must be L1 cache line 44 * aligned, and must not cross a 4kB boundary. Its size field must be at 45 * least 640 bytes (but may be more). 46 * 47 * Pre-v4.14 KVM hypervisors reject the VPA if its size field is smaller than 48 * 1kB, so we dynamically allocate 1kB and advertise size as 1kB, but keep 49 * this structure as the canonical 640 byte size. 50 */ 51 struct lppaca { 52 /* cacheline 1 contains read-only data */ 53 54 __be32 desc; /* Eye catcher 0xD397D781 */ 55 __be16 size; /* Size of this struct */ 56 u8 reserved1[3]; 57 u8 __old_status; /* Old status, including shared proc */ 58 u8 reserved3[14]; 59 volatile __be32 dyn_hw_node_id; /* Dynamic hardware node id */ 60 volatile __be32 dyn_hw_proc_id; /* Dynamic hardware proc id */ 61 u8 reserved4[56]; 62 volatile u8 vphn_assoc_counts[8]; /* Virtual processor home node */ 63 /* associativity change counters */ 64 u8 reserved5[32]; 65 66 /* cacheline 2 contains local read-write data */ 67 68 u8 reserved6[48]; 69 u8 cede_latency_hint; 70 u8 ebb_regs_in_use; 71 u8 reserved7[6]; 72 u8 dtl_enable_mask; /* Dispatch Trace Log mask */ 73 u8 donate_dedicated_cpu; /* Donate dedicated CPU cycles */ 74 u8 fpregs_in_use; 75 u8 pmcregs_in_use; 76 u8 reserved8[28]; 77 __be64 wait_state_cycles; /* Wait cycles for this proc */ 78 u8 reserved9[28]; 79 __be16 slb_count; /* # of SLBs to maintain */ 80 u8 idle; /* Indicate OS is idle */ 81 u8 vmxregs_in_use; 82 83 /* cacheline 3 is shared with other processors */ 84 85 /* 86 * This is the yield_count. An "odd" value (low bit on) means that 87 * the processor is yielded (either because of an OS yield or a 88 * hypervisor preempt). An even value implies that the processor is 89 * currently executing. 90 * NOTE: Even dedicated processor partitions can yield so this 91 * field cannot be used to determine if we are shared or dedicated. 92 */ 93 volatile __be32 yield_count; 94 volatile __be32 dispersion_count; /* dispatch changed physical cpu */ 95 volatile __be64 cmo_faults; /* CMO page fault count */ 96 volatile __be64 cmo_fault_time; /* CMO page fault time */ 97 u8 reserved10[104]; 98 99 /* cacheline 4-5 */ 100 101 __be32 page_ins; /* CMO Hint - # page ins by OS */ 102 u8 reserved11[148]; 103 volatile __be64 dtl_idx; /* Dispatch Trace Log head index */ 104 u8 reserved12[96]; 105 } ____cacheline_aligned; 106 107 #define lppaca_of(cpu) (*paca_ptrs[cpu]->lppaca_ptr) 108 109 /* 110 * We are using a non architected field to determine if a partition is 111 * shared or dedicated. This currently works on both KVM and PHYP, but 112 * we will have to transition to something better. 113 */ 114 #define LPPACA_OLD_SHARED_PROC 2 115 116 static inline bool lppaca_shared_proc(struct lppaca *l) 117 { 118 if (!firmware_has_feature(FW_FEATURE_SPLPAR)) 119 return false; 120 return !!(l->__old_status & LPPACA_OLD_SHARED_PROC); 121 } 122 123 /* 124 * SLB shadow buffer structure as defined in the PAPR. The save_area 125 * contains adjacent ESID and VSID pairs for each shadowed SLB. The 126 * ESID is stored in the lower 64bits, then the VSID. 127 */ 128 struct slb_shadow { 129 __be32 persistent; /* Number of persistent SLBs */ 130 __be32 buffer_length; /* Total shadow buffer length */ 131 __be64 reserved; 132 struct { 133 __be64 esid; 134 __be64 vsid; 135 } save_area[SLB_NUM_BOLTED]; 136 } ____cacheline_aligned; 137 138 /* 139 * Layout of entries in the hypervisor's dispatch trace log buffer. 140 */ 141 struct dtl_entry { 142 u8 dispatch_reason; 143 u8 preempt_reason; 144 __be16 processor_id; 145 __be32 enqueue_to_dispatch_time; 146 __be32 ready_to_enqueue_time; 147 __be32 waiting_to_ready_time; 148 __be64 timebase; 149 __be64 fault_addr; 150 __be64 srr0; 151 __be64 srr1; 152 }; 153 154 #define DISPATCH_LOG_BYTES 4096 /* bytes per cpu */ 155 #define N_DISPATCH_LOG (DISPATCH_LOG_BYTES / sizeof(struct dtl_entry)) 156 157 extern struct kmem_cache *dtl_cache; 158 159 /* 160 * When CONFIG_VIRT_CPU_ACCOUNTING_NATIVE = y, the cpu accounting code controls 161 * reading from the dispatch trace log. If other code wants to consume 162 * DTL entries, it can set this pointer to a function that will get 163 * called once for each DTL entry that gets processed. 164 */ 165 extern void (*dtl_consumer)(struct dtl_entry *entry, u64 index); 166 167 #endif /* CONFIG_PPC_BOOK3S */ 168 #endif /* __KERNEL__ */ 169 #endif /* _ASM_POWERPC_LPPACA_H */ 170