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 9 #ifdef __KERNEL__ 10 11 /* 12 * These definitions relate to hypervisors that only exist when using 13 * a server type processor 14 */ 15 #ifdef CONFIG_PPC_BOOK3S 16 17 /* 18 * This control block contains the data that is shared between the 19 * hypervisor and the OS. 20 */ 21 #include <linux/cache.h> 22 #include <linux/threads.h> 23 #include <asm/types.h> 24 #include <asm/mmu.h> 25 #include <asm/firmware.h> 26 #include <asm/paca.h> 27 28 /* 29 * The lppaca is the "virtual processor area" registered with the hypervisor, 30 * H_REGISTER_VPA etc. 31 * 32 * According to PAPR, the structure is 640 bytes long, must be L1 cache line 33 * aligned, and must not cross a 4kB boundary. Its size field must be at 34 * least 640 bytes (but may be more). 35 * 36 * Pre-v4.14 KVM hypervisors reject the VPA if its size field is smaller than 37 * 1kB, so we dynamically allocate 1kB and advertise size as 1kB, but keep 38 * this structure as the canonical 640 byte size. 39 */ 40 struct lppaca { 41 /* cacheline 1 contains read-only data */ 42 43 __be32 desc; /* Eye catcher 0xD397D781 */ 44 __be16 size; /* Size of this struct */ 45 u8 reserved1[3]; 46 u8 __old_status; /* Old status, including shared proc */ 47 u8 reserved3[14]; 48 volatile __be32 dyn_hw_node_id; /* Dynamic hardware node id */ 49 volatile __be32 dyn_hw_proc_id; /* Dynamic hardware proc id */ 50 u8 reserved4[56]; 51 volatile u8 vphn_assoc_counts[8]; /* Virtual processor home node */ 52 /* associativity change counters */ 53 u8 reserved5[32]; 54 55 /* cacheline 2 contains local read-write data */ 56 57 u8 reserved6[48]; 58 u8 cede_latency_hint; 59 u8 ebb_regs_in_use; 60 u8 reserved7[6]; 61 u8 dtl_enable_mask; /* Dispatch Trace Log mask */ 62 u8 donate_dedicated_cpu; /* Donate dedicated CPU cycles */ 63 u8 fpregs_in_use; 64 u8 pmcregs_in_use; 65 u8 l2_counters_enable; /* Enable usage of counters for KVM guest */ 66 u8 reserved8[27]; 67 __be64 wait_state_cycles; /* Wait cycles for this proc */ 68 u8 reserved9[28]; 69 __be16 slb_count; /* # of SLBs to maintain */ 70 u8 idle; /* Indicate OS is idle */ 71 u8 vmxregs_in_use; 72 73 /* cacheline 3 is shared with other processors */ 74 75 /* 76 * This is the yield_count. An "odd" value (low bit on) means that 77 * the processor is yielded (either because of an OS yield or a 78 * hypervisor preempt). An even value implies that the processor is 79 * currently executing. 80 * NOTE: Even dedicated processor partitions can yield so this 81 * field cannot be used to determine if we are shared or dedicated. 82 */ 83 volatile __be32 yield_count; 84 volatile __be32 dispersion_count; /* dispatch changed physical cpu */ 85 volatile __be64 cmo_faults; /* CMO page fault count */ 86 volatile __be64 cmo_fault_time; /* CMO page fault time */ 87 u8 reserved10[64]; /* [S]PURR expropriated/donated */ 88 volatile __be64 enqueue_dispatch_tb; /* Total TB enqueue->dispatch */ 89 volatile __be64 ready_enqueue_tb; /* Total TB ready->enqueue */ 90 volatile __be64 wait_ready_tb; /* Total TB wait->ready */ 91 u8 reserved11[16]; 92 93 /* cacheline 4-5 */ 94 95 __be32 page_ins; /* CMO Hint - # page ins by OS */ 96 u8 reserved12[28]; 97 volatile __be64 l1_to_l2_cs_tb; 98 volatile __be64 l2_to_l1_cs_tb; 99 volatile __be64 l2_runtime_tb; 100 u8 reserved13[96]; 101 volatile __be64 dtl_idx; /* Dispatch Trace Log head index */ 102 u8 reserved14[96]; 103 } ____cacheline_aligned; 104 105 #define lppaca_of(cpu) (*paca_ptrs[cpu]->lppaca_ptr) 106 107 /* 108 * We are using a non architected field to determine if a partition is 109 * shared or dedicated. This currently works on both KVM and PHYP, but 110 * we will have to transition to something better. 111 */ 112 #define LPPACA_OLD_SHARED_PROC 2 113 114 #ifdef CONFIG_PPC_PSERIES 115 /* 116 * All CPUs should have the same shared proc value, so directly access the PACA 117 * to avoid false positives from DEBUG_PREEMPT. 118 */ 119 static inline bool lppaca_shared_proc(void) 120 { 121 struct lppaca *l = local_paca->lppaca_ptr; 122 123 if (!firmware_has_feature(FW_FEATURE_SPLPAR)) 124 return false; 125 return !!(l->__old_status & LPPACA_OLD_SHARED_PROC); 126 } 127 128 #define get_lppaca() (get_paca()->lppaca_ptr) 129 #endif 130 131 /* 132 * SLB shadow buffer structure as defined in the PAPR. The save_area 133 * contains adjacent ESID and VSID pairs for each shadowed SLB. The 134 * ESID is stored in the lower 64bits, then the VSID. 135 */ 136 struct slb_shadow { 137 __be32 persistent; /* Number of persistent SLBs */ 138 __be32 buffer_length; /* Total shadow buffer length */ 139 __be64 reserved; 140 struct { 141 __be64 esid; 142 __be64 vsid; 143 } save_area[SLB_NUM_BOLTED]; 144 } ____cacheline_aligned; 145 146 #endif /* CONFIG_PPC_BOOK3S */ 147 #endif /* __KERNEL__ */ 148 #endif /* _ASM_POWERPC_LPPACA_H */ 149