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 49 /* 50 * The lppaca is the "virtual processor area" registered with the hypervisor, 51 * H_REGISTER_VPA etc. 52 * 53 * According to PAPR, the structure is 640 bytes long, must be L1 cache line 54 * aligned, and must not cross a 4kB boundary. Its size field must be at 55 * least 640 bytes (but may be more). 56 * 57 * Pre-v4.14 KVM hypervisors reject the VPA if its size field is smaller than 58 * 1kB, so we dynamically allocate 1kB and advertise size as 1kB, but keep 59 * this structure as the canonical 640 byte size. 60 */ 61 struct lppaca { 62 /* cacheline 1 contains read-only data */ 63 64 __be32 desc; /* Eye catcher 0xD397D781 */ 65 __be16 size; /* Size of this struct */ 66 u8 reserved1[3]; 67 u8 __old_status; /* Old status, including shared proc */ 68 u8 reserved3[14]; 69 volatile __be32 dyn_hw_node_id; /* Dynamic hardware node id */ 70 volatile __be32 dyn_hw_proc_id; /* Dynamic hardware proc id */ 71 u8 reserved4[56]; 72 volatile u8 vphn_assoc_counts[8]; /* Virtual processor home node */ 73 /* associativity change counters */ 74 u8 reserved5[32]; 75 76 /* cacheline 2 contains local read-write data */ 77 78 u8 reserved6[48]; 79 u8 cede_latency_hint; 80 u8 ebb_regs_in_use; 81 u8 reserved7[6]; 82 u8 dtl_enable_mask; /* Dispatch Trace Log mask */ 83 u8 donate_dedicated_cpu; /* Donate dedicated CPU cycles */ 84 u8 fpregs_in_use; 85 u8 pmcregs_in_use; 86 u8 reserved8[28]; 87 __be64 wait_state_cycles; /* Wait cycles for this proc */ 88 u8 reserved9[28]; 89 __be16 slb_count; /* # of SLBs to maintain */ 90 u8 idle; /* Indicate OS is idle */ 91 u8 vmxregs_in_use; 92 93 /* cacheline 3 is shared with other processors */ 94 95 /* 96 * This is the yield_count. An "odd" value (low bit on) means that 97 * the processor is yielded (either because of an OS yield or a 98 * hypervisor preempt). An even value implies that the processor is 99 * currently executing. 100 * NOTE: Even dedicated processor partitions can yield so this 101 * field cannot be used to determine if we are shared or dedicated. 102 */ 103 volatile __be32 yield_count; 104 volatile __be32 dispersion_count; /* dispatch changed physical cpu */ 105 volatile __be64 cmo_faults; /* CMO page fault count */ 106 volatile __be64 cmo_fault_time; /* CMO page fault time */ 107 u8 reserved10[104]; 108 109 /* cacheline 4-5 */ 110 111 __be32 page_ins; /* CMO Hint - # page ins by OS */ 112 u8 reserved11[148]; 113 volatile __be64 dtl_idx; /* Dispatch Trace Log head index */ 114 u8 reserved12[96]; 115 } ____cacheline_aligned; 116 117 #define lppaca_of(cpu) (*paca_ptrs[cpu]->lppaca_ptr) 118 119 /* 120 * We are using a non architected field to determine if a partition is 121 * shared or dedicated. This currently works on both KVM and PHYP, but 122 * we will have to transition to something better. 123 */ 124 #define LPPACA_OLD_SHARED_PROC 2 125 126 static inline bool lppaca_shared_proc(struct lppaca *l) 127 { 128 if (!firmware_has_feature(FW_FEATURE_SPLPAR)) 129 return false; 130 return !!(l->__old_status & LPPACA_OLD_SHARED_PROC); 131 } 132 133 /* 134 * SLB shadow buffer structure as defined in the PAPR. The save_area 135 * contains adjacent ESID and VSID pairs for each shadowed SLB. The 136 * ESID is stored in the lower 64bits, then the VSID. 137 */ 138 struct slb_shadow { 139 __be32 persistent; /* Number of persistent SLBs */ 140 __be32 buffer_length; /* Total shadow buffer length */ 141 __be64 reserved; 142 struct { 143 __be64 esid; 144 __be64 vsid; 145 } save_area[SLB_NUM_BOLTED]; 146 } ____cacheline_aligned; 147 148 extern long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity); 149 150 #endif /* CONFIG_PPC_BOOK3S */ 151 #endif /* __KERNEL__ */ 152 #endif /* _ASM_POWERPC_LPPACA_H */ 153