1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * lppaca.h 4 * Copyright (C) 2001 Mike Corrigan IBM Corporation 5 */ 6 #ifndef _ASM_POWERPC_LPPACA_H 7 #define _ASM_POWERPC_LPPACA_H 8 #ifdef __KERNEL__ 9 10 /* 11 * These definitions relate to hypervisors that only exist when using 12 * a server type processor 13 */ 14 #ifdef CONFIG_PPC_BOOK3S 15 16 /* 17 * This control block contains the data that is shared between the 18 * hypervisor and the OS. 19 */ 20 #include <linux/cache.h> 21 #include <linux/threads.h> 22 #include <asm/types.h> 23 #include <asm/mmu.h> 24 #include <asm/firmware.h> 25 26 /* 27 * The lppaca is the "virtual processor area" registered with the hypervisor, 28 * H_REGISTER_VPA etc. 29 * 30 * According to PAPR, the structure is 640 bytes long, must be L1 cache line 31 * aligned, and must not cross a 4kB boundary. Its size field must be at 32 * least 640 bytes (but may be more). 33 * 34 * Pre-v4.14 KVM hypervisors reject the VPA if its size field is smaller than 35 * 1kB, so we dynamically allocate 1kB and advertise size as 1kB, but keep 36 * this structure as the canonical 640 byte size. 37 */ 38 struct lppaca { 39 /* cacheline 1 contains read-only data */ 40 41 __be32 desc; /* Eye catcher 0xD397D781 */ 42 __be16 size; /* Size of this struct */ 43 u8 reserved1[3]; 44 u8 __old_status; /* Old status, including shared proc */ 45 u8 reserved3[14]; 46 volatile __be32 dyn_hw_node_id; /* Dynamic hardware node id */ 47 volatile __be32 dyn_hw_proc_id; /* Dynamic hardware proc id */ 48 u8 reserved4[56]; 49 volatile u8 vphn_assoc_counts[8]; /* Virtual processor home node */ 50 /* associativity change counters */ 51 u8 reserved5[32]; 52 53 /* cacheline 2 contains local read-write data */ 54 55 u8 reserved6[48]; 56 u8 cede_latency_hint; 57 u8 ebb_regs_in_use; 58 u8 reserved7[6]; 59 u8 dtl_enable_mask; /* Dispatch Trace Log mask */ 60 u8 donate_dedicated_cpu; /* Donate dedicated CPU cycles */ 61 u8 fpregs_in_use; 62 u8 pmcregs_in_use; 63 u8 reserved8[28]; 64 __be64 wait_state_cycles; /* Wait cycles for this proc */ 65 u8 reserved9[28]; 66 __be16 slb_count; /* # of SLBs to maintain */ 67 u8 idle; /* Indicate OS is idle */ 68 u8 vmxregs_in_use; 69 70 /* cacheline 3 is shared with other processors */ 71 72 /* 73 * This is the yield_count. An "odd" value (low bit on) means that 74 * the processor is yielded (either because of an OS yield or a 75 * hypervisor preempt). An even value implies that the processor is 76 * currently executing. 77 * NOTE: Even dedicated processor partitions can yield so this 78 * field cannot be used to determine if we are shared or dedicated. 79 */ 80 volatile __be32 yield_count; 81 volatile __be32 dispersion_count; /* dispatch changed physical cpu */ 82 volatile __be64 cmo_faults; /* CMO page fault count */ 83 volatile __be64 cmo_fault_time; /* CMO page fault time */ 84 u8 reserved10[104]; 85 86 /* cacheline 4-5 */ 87 88 __be32 page_ins; /* CMO Hint - # page ins by OS */ 89 u8 reserved11[148]; 90 volatile __be64 dtl_idx; /* Dispatch Trace Log head index */ 91 u8 reserved12[96]; 92 } ____cacheline_aligned; 93 94 #define lppaca_of(cpu) (*paca_ptrs[cpu]->lppaca_ptr) 95 96 /* 97 * We are using a non architected field to determine if a partition is 98 * shared or dedicated. This currently works on both KVM and PHYP, but 99 * we will have to transition to something better. 100 */ 101 #define LPPACA_OLD_SHARED_PROC 2 102 103 static inline bool lppaca_shared_proc(struct lppaca *l) 104 { 105 if (!firmware_has_feature(FW_FEATURE_SPLPAR)) 106 return false; 107 return !!(l->__old_status & LPPACA_OLD_SHARED_PROC); 108 } 109 110 /* 111 * SLB shadow buffer structure as defined in the PAPR. The save_area 112 * contains adjacent ESID and VSID pairs for each shadowed SLB. The 113 * ESID is stored in the lower 64bits, then the VSID. 114 */ 115 struct slb_shadow { 116 __be32 persistent; /* Number of persistent SLBs */ 117 __be32 buffer_length; /* Total shadow buffer length */ 118 __be64 reserved; 119 struct { 120 __be64 esid; 121 __be64 vsid; 122 } save_area[SLB_NUM_BOLTED]; 123 } ____cacheline_aligned; 124 125 /* 126 * Layout of entries in the hypervisor's dispatch trace log buffer. 127 */ 128 struct dtl_entry { 129 u8 dispatch_reason; 130 u8 preempt_reason; 131 __be16 processor_id; 132 __be32 enqueue_to_dispatch_time; 133 __be32 ready_to_enqueue_time; 134 __be32 waiting_to_ready_time; 135 __be64 timebase; 136 __be64 fault_addr; 137 __be64 srr0; 138 __be64 srr1; 139 }; 140 141 #define DISPATCH_LOG_BYTES 4096 /* bytes per cpu */ 142 #define N_DISPATCH_LOG (DISPATCH_LOG_BYTES / sizeof(struct dtl_entry)) 143 144 extern struct kmem_cache *dtl_cache; 145 146 /* 147 * When CONFIG_VIRT_CPU_ACCOUNTING_NATIVE = y, the cpu accounting code controls 148 * reading from the dispatch trace log. If other code wants to consume 149 * DTL entries, it can set this pointer to a function that will get 150 * called once for each DTL entry that gets processed. 151 */ 152 extern void (*dtl_consumer)(struct dtl_entry *entry, u64 index); 153 154 #endif /* CONFIG_PPC_BOOK3S */ 155 #endif /* __KERNEL__ */ 156 #endif /* _ASM_POWERPC_LPPACA_H */ 157