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 /* 10 * The below VPHN macros are outside the __KERNEL__ check since these are 11 * used for compiling the vphn selftest in userspace 12 */ 13 14 /* The H_HOME_NODE_ASSOCIATIVITY h_call returns 6 64-bit registers. */ 15 #define VPHN_REGISTER_COUNT 6 16 17 /* 18 * 6 64-bit registers unpacked into up to 24 be32 associativity values. To 19 * form the complete property we have to add the length in the first cell. 20 */ 21 #define VPHN_ASSOC_BUFSIZE (VPHN_REGISTER_COUNT*sizeof(u64)/sizeof(u16) + 1) 22 23 /* 24 * The H_HOME_NODE_ASSOCIATIVITY hcall takes two values for flags: 25 * 1 for retrieving associativity information for a guest cpu 26 * 2 for retrieving associativity information for a host/hypervisor cpu 27 */ 28 #define VPHN_FLAG_VCPU 1 29 #define VPHN_FLAG_PCPU 2 30 31 #ifdef __KERNEL__ 32 33 /* 34 * These definitions relate to hypervisors that only exist when using 35 * a server type processor 36 */ 37 #ifdef CONFIG_PPC_BOOK3S 38 39 /* 40 * This control block contains the data that is shared between the 41 * hypervisor and the OS. 42 */ 43 #include <linux/cache.h> 44 #include <linux/threads.h> 45 #include <asm/types.h> 46 #include <asm/mmu.h> 47 #include <asm/firmware.h> 48 #include <asm/paca.h> 49 50 /* 51 * The lppaca is the "virtual processor area" registered with the hypervisor, 52 * H_REGISTER_VPA etc. 53 * 54 * According to PAPR, the structure is 640 bytes long, must be L1 cache line 55 * aligned, and must not cross a 4kB boundary. Its size field must be at 56 * least 640 bytes (but may be more). 57 * 58 * Pre-v4.14 KVM hypervisors reject the VPA if its size field is smaller than 59 * 1kB, so we dynamically allocate 1kB and advertise size as 1kB, but keep 60 * this structure as the canonical 640 byte size. 61 */ 62 struct lppaca { 63 /* cacheline 1 contains read-only data */ 64 65 __be32 desc; /* Eye catcher 0xD397D781 */ 66 __be16 size; /* Size of this struct */ 67 u8 reserved1[3]; 68 u8 __old_status; /* Old status, including shared proc */ 69 u8 reserved3[14]; 70 volatile __be32 dyn_hw_node_id; /* Dynamic hardware node id */ 71 volatile __be32 dyn_hw_proc_id; /* Dynamic hardware proc id */ 72 u8 reserved4[56]; 73 volatile u8 vphn_assoc_counts[8]; /* Virtual processor home node */ 74 /* associativity change counters */ 75 u8 reserved5[32]; 76 77 /* cacheline 2 contains local read-write data */ 78 79 u8 reserved6[48]; 80 u8 cede_latency_hint; 81 u8 ebb_regs_in_use; 82 u8 reserved7[6]; 83 u8 dtl_enable_mask; /* Dispatch Trace Log mask */ 84 u8 donate_dedicated_cpu; /* Donate dedicated CPU cycles */ 85 u8 fpregs_in_use; 86 u8 pmcregs_in_use; 87 u8 reserved8[28]; 88 __be64 wait_state_cycles; /* Wait cycles for this proc */ 89 u8 reserved9[28]; 90 __be16 slb_count; /* # of SLBs to maintain */ 91 u8 idle; /* Indicate OS is idle */ 92 u8 vmxregs_in_use; 93 94 /* cacheline 3 is shared with other processors */ 95 96 /* 97 * This is the yield_count. An "odd" value (low bit on) means that 98 * the processor is yielded (either because of an OS yield or a 99 * hypervisor preempt). An even value implies that the processor is 100 * currently executing. 101 * NOTE: Even dedicated processor partitions can yield so this 102 * field cannot be used to determine if we are shared or dedicated. 103 */ 104 volatile __be32 yield_count; 105 volatile __be32 dispersion_count; /* dispatch changed physical cpu */ 106 volatile __be64 cmo_faults; /* CMO page fault count */ 107 volatile __be64 cmo_fault_time; /* CMO page fault time */ 108 u8 reserved10[104]; 109 110 /* cacheline 4-5 */ 111 112 __be32 page_ins; /* CMO Hint - # page ins by OS */ 113 u8 reserved11[148]; 114 volatile __be64 dtl_idx; /* Dispatch Trace Log head index */ 115 u8 reserved12[96]; 116 } ____cacheline_aligned; 117 118 #define lppaca_of(cpu) (*paca_ptrs[cpu]->lppaca_ptr) 119 120 /* 121 * We are using a non architected field to determine if a partition is 122 * shared or dedicated. This currently works on both KVM and PHYP, but 123 * we will have to transition to something better. 124 */ 125 #define LPPACA_OLD_SHARED_PROC 2 126 127 #ifdef CONFIG_PPC_PSERIES 128 /* 129 * All CPUs should have the same shared proc value, so directly access the PACA 130 * to avoid false positives from DEBUG_PREEMPT. 131 */ 132 static inline bool lppaca_shared_proc(void) 133 { 134 struct lppaca *l = local_paca->lppaca_ptr; 135 136 if (!firmware_has_feature(FW_FEATURE_SPLPAR)) 137 return false; 138 return !!(l->__old_status & LPPACA_OLD_SHARED_PROC); 139 } 140 141 #define get_lppaca() (get_paca()->lppaca_ptr) 142 #endif 143 144 /* 145 * SLB shadow buffer structure as defined in the PAPR. The save_area 146 * contains adjacent ESID and VSID pairs for each shadowed SLB. The 147 * ESID is stored in the lower 64bits, then the VSID. 148 */ 149 struct slb_shadow { 150 __be32 persistent; /* Number of persistent SLBs */ 151 __be32 buffer_length; /* Total shadow buffer length */ 152 __be64 reserved; 153 struct { 154 __be64 esid; 155 __be64 vsid; 156 } save_area[SLB_NUM_BOLTED]; 157 } ____cacheline_aligned; 158 159 extern long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity); 160 161 #endif /* CONFIG_PPC_BOOK3S */ 162 #endif /* __KERNEL__ */ 163 #endif /* _ASM_POWERPC_LPPACA_H */ 164