1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * ARMv8 PMUv3 Performance Events handling code. 4 * 5 * Copyright (C) 2012 ARM Limited 6 * Author: Will Deacon <will.deacon@arm.com> 7 * 8 * This code is based heavily on the ARMv7 perf event code. 9 */ 10 11#include <asm/irq_regs.h> 12#include <asm/perf_event.h> 13#include <asm/virt.h> 14 15#include <clocksource/arm_arch_timer.h> 16 17#include <linux/acpi.h> 18#include <linux/bitfield.h> 19#include <linux/clocksource.h> 20#include <linux/of.h> 21#include <linux/perf/arm_pmu.h> 22#include <linux/perf/arm_pmuv3.h> 23#include <linux/platform_device.h> 24#include <linux/sched_clock.h> 25#include <linux/smp.h> 26#include <linux/nmi.h> 27 28#include <asm/arm_pmuv3.h> 29 30/* ARMv8 Cortex-A53 specific event types. */ 31#define ARMV8_A53_PERFCTR_PREF_LINEFILL 0xC2 32 33/* ARMv8 Cavium ThunderX specific event types. */ 34#define ARMV8_THUNDER_PERFCTR_L1D_CACHE_MISS_ST 0xE9 35#define ARMV8_THUNDER_PERFCTR_L1D_CACHE_PREF_ACCESS 0xEA 36#define ARMV8_THUNDER_PERFCTR_L1D_CACHE_PREF_MISS 0xEB 37#define ARMV8_THUNDER_PERFCTR_L1I_CACHE_PREF_ACCESS 0xEC 38#define ARMV8_THUNDER_PERFCTR_L1I_CACHE_PREF_MISS 0xED 39 40/* 41 * ARMv8 Architectural defined events, not all of these may 42 * be supported on any given implementation. Unsupported events will 43 * be disabled at run-time based on the PMCEID registers. 44 */ 45static const unsigned armv8_pmuv3_perf_map[PERF_COUNT_HW_MAX] = { 46 PERF_MAP_ALL_UNSUPPORTED, 47 [PERF_COUNT_HW_CPU_CYCLES] = ARMV8_PMUV3_PERFCTR_CPU_CYCLES, 48 [PERF_COUNT_HW_INSTRUCTIONS] = ARMV8_PMUV3_PERFCTR_INST_RETIRED, 49 [PERF_COUNT_HW_CACHE_REFERENCES] = ARMV8_PMUV3_PERFCTR_L1D_CACHE, 50 [PERF_COUNT_HW_CACHE_MISSES] = ARMV8_PMUV3_PERFCTR_L1D_CACHE_REFILL, 51 [PERF_COUNT_HW_BRANCH_MISSES] = ARMV8_PMUV3_PERFCTR_BR_MIS_PRED, 52 [PERF_COUNT_HW_BUS_CYCLES] = ARMV8_PMUV3_PERFCTR_BUS_CYCLES, 53 [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = ARMV8_PMUV3_PERFCTR_STALL_FRONTEND, 54 [PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = ARMV8_PMUV3_PERFCTR_STALL_BACKEND, 55}; 56 57static const unsigned armv8_pmuv3_perf_cache_map[PERF_COUNT_HW_CACHE_MAX] 58 [PERF_COUNT_HW_CACHE_OP_MAX] 59 [PERF_COUNT_HW_CACHE_RESULT_MAX] = { 60 PERF_CACHE_MAP_ALL_UNSUPPORTED, 61 62 [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_L1D_CACHE, 63 [C(L1D)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_PMUV3_PERFCTR_L1D_CACHE_REFILL, 64 65 [C(L1I)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_L1I_CACHE, 66 [C(L1I)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_PMUV3_PERFCTR_L1I_CACHE_REFILL, 67 68 [C(DTLB)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_PMUV3_PERFCTR_L1D_TLB_REFILL, 69 [C(DTLB)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_L1D_TLB, 70 71 [C(ITLB)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_PMUV3_PERFCTR_L1I_TLB_REFILL, 72 [C(ITLB)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_L1I_TLB, 73 74 [C(LL)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_PMUV3_PERFCTR_LL_CACHE_MISS_RD, 75 [C(LL)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_LL_CACHE_RD, 76 77 [C(BPU)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_BR_PRED, 78 [C(BPU)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_PMUV3_PERFCTR_BR_MIS_PRED, 79}; 80 81static const unsigned armv8_a53_perf_cache_map[PERF_COUNT_HW_CACHE_MAX] 82 [PERF_COUNT_HW_CACHE_OP_MAX] 83 [PERF_COUNT_HW_CACHE_RESULT_MAX] = { 84 PERF_CACHE_MAP_ALL_UNSUPPORTED, 85 86 [C(L1D)][C(OP_PREFETCH)][C(RESULT_MISS)] = ARMV8_A53_PERFCTR_PREF_LINEFILL, 87 88 [C(NODE)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_RD, 89 [C(NODE)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_WR, 90}; 91 92static const unsigned armv8_a57_perf_cache_map[PERF_COUNT_HW_CACHE_MAX] 93 [PERF_COUNT_HW_CACHE_OP_MAX] 94 [PERF_COUNT_HW_CACHE_RESULT_MAX] = { 95 PERF_CACHE_MAP_ALL_UNSUPPORTED, 96 97 [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_RD, 98 [C(L1D)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_RD, 99 [C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WR, 100 [C(L1D)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_WR, 101 102 [C(DTLB)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_RD, 103 [C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_WR, 104 105 [C(NODE)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_RD, 106 [C(NODE)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_WR, 107}; 108 109static const unsigned armv8_a73_perf_cache_map[PERF_COUNT_HW_CACHE_MAX] 110 [PERF_COUNT_HW_CACHE_OP_MAX] 111 [PERF_COUNT_HW_CACHE_RESULT_MAX] = { 112 PERF_CACHE_MAP_ALL_UNSUPPORTED, 113 114 [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_RD, 115 [C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WR, 116}; 117 118static const unsigned armv8_thunder_perf_cache_map[PERF_COUNT_HW_CACHE_MAX] 119 [PERF_COUNT_HW_CACHE_OP_MAX] 120 [PERF_COUNT_HW_CACHE_RESULT_MAX] = { 121 PERF_CACHE_MAP_ALL_UNSUPPORTED, 122 123 [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_RD, 124 [C(L1D)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_RD, 125 [C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WR, 126 [C(L1D)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV8_THUNDER_PERFCTR_L1D_CACHE_MISS_ST, 127 [C(L1D)][C(OP_PREFETCH)][C(RESULT_ACCESS)] = ARMV8_THUNDER_PERFCTR_L1D_CACHE_PREF_ACCESS, 128 [C(L1D)][C(OP_PREFETCH)][C(RESULT_MISS)] = ARMV8_THUNDER_PERFCTR_L1D_CACHE_PREF_MISS, 129 130 [C(L1I)][C(OP_PREFETCH)][C(RESULT_ACCESS)] = ARMV8_THUNDER_PERFCTR_L1I_CACHE_PREF_ACCESS, 131 [C(L1I)][C(OP_PREFETCH)][C(RESULT_MISS)] = ARMV8_THUNDER_PERFCTR_L1I_CACHE_PREF_MISS, 132 133 [C(DTLB)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_RD, 134 [C(DTLB)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_RD, 135 [C(DTLB)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_WR, 136 [C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_WR, 137}; 138 139static const unsigned armv8_vulcan_perf_cache_map[PERF_COUNT_HW_CACHE_MAX] 140 [PERF_COUNT_HW_CACHE_OP_MAX] 141 [PERF_COUNT_HW_CACHE_RESULT_MAX] = { 142 PERF_CACHE_MAP_ALL_UNSUPPORTED, 143 144 [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_RD, 145 [C(L1D)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_RD, 146 [C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WR, 147 [C(L1D)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_WR, 148 149 [C(DTLB)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_RD, 150 [C(DTLB)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_WR, 151 [C(DTLB)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_RD, 152 [C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_WR, 153 154 [C(NODE)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_RD, 155 [C(NODE)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_WR, 156}; 157 158static ssize_t 159armv8pmu_events_sysfs_show(struct device *dev, 160 struct device_attribute *attr, char *page) 161{ 162 struct perf_pmu_events_attr *pmu_attr; 163 164 pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr); 165 166 return sprintf(page, "event=0x%04llx\n", pmu_attr->id); 167} 168 169#define ARMV8_EVENT_ATTR(name, config) \ 170 PMU_EVENT_ATTR_ID(name, armv8pmu_events_sysfs_show, config) 171 172static struct attribute *armv8_pmuv3_event_attrs[] = { 173 /* 174 * Don't expose the sw_incr event in /sys. It's not usable as writes to 175 * PMSWINC_EL0 will trap as PMUSERENR.{SW,EN}=={0,0} and event rotation 176 * means we don't have a fixed event<->counter relationship regardless. 177 */ 178 ARMV8_EVENT_ATTR(l1i_cache_refill, ARMV8_PMUV3_PERFCTR_L1I_CACHE_REFILL), 179 ARMV8_EVENT_ATTR(l1i_tlb_refill, ARMV8_PMUV3_PERFCTR_L1I_TLB_REFILL), 180 ARMV8_EVENT_ATTR(l1d_cache_refill, ARMV8_PMUV3_PERFCTR_L1D_CACHE_REFILL), 181 ARMV8_EVENT_ATTR(l1d_cache, ARMV8_PMUV3_PERFCTR_L1D_CACHE), 182 ARMV8_EVENT_ATTR(l1d_tlb_refill, ARMV8_PMUV3_PERFCTR_L1D_TLB_REFILL), 183 ARMV8_EVENT_ATTR(ld_retired, ARMV8_PMUV3_PERFCTR_LD_RETIRED), 184 ARMV8_EVENT_ATTR(st_retired, ARMV8_PMUV3_PERFCTR_ST_RETIRED), 185 ARMV8_EVENT_ATTR(inst_retired, ARMV8_PMUV3_PERFCTR_INST_RETIRED), 186 ARMV8_EVENT_ATTR(exc_taken, ARMV8_PMUV3_PERFCTR_EXC_TAKEN), 187 ARMV8_EVENT_ATTR(exc_return, ARMV8_PMUV3_PERFCTR_EXC_RETURN), 188 ARMV8_EVENT_ATTR(cid_write_retired, ARMV8_PMUV3_PERFCTR_CID_WRITE_RETIRED), 189 ARMV8_EVENT_ATTR(pc_write_retired, ARMV8_PMUV3_PERFCTR_PC_WRITE_RETIRED), 190 ARMV8_EVENT_ATTR(br_immed_retired, ARMV8_PMUV3_PERFCTR_BR_IMMED_RETIRED), 191 ARMV8_EVENT_ATTR(br_return_retired, ARMV8_PMUV3_PERFCTR_BR_RETURN_RETIRED), 192 ARMV8_EVENT_ATTR(unaligned_ldst_retired, ARMV8_PMUV3_PERFCTR_UNALIGNED_LDST_RETIRED), 193 ARMV8_EVENT_ATTR(br_mis_pred, ARMV8_PMUV3_PERFCTR_BR_MIS_PRED), 194 ARMV8_EVENT_ATTR(cpu_cycles, ARMV8_PMUV3_PERFCTR_CPU_CYCLES), 195 ARMV8_EVENT_ATTR(br_pred, ARMV8_PMUV3_PERFCTR_BR_PRED), 196 ARMV8_EVENT_ATTR(mem_access, ARMV8_PMUV3_PERFCTR_MEM_ACCESS), 197 ARMV8_EVENT_ATTR(l1i_cache, ARMV8_PMUV3_PERFCTR_L1I_CACHE), 198 ARMV8_EVENT_ATTR(l1d_cache_wb, ARMV8_PMUV3_PERFCTR_L1D_CACHE_WB), 199 ARMV8_EVENT_ATTR(l2d_cache, ARMV8_PMUV3_PERFCTR_L2D_CACHE), 200 ARMV8_EVENT_ATTR(l2d_cache_refill, ARMV8_PMUV3_PERFCTR_L2D_CACHE_REFILL), 201 ARMV8_EVENT_ATTR(l2d_cache_wb, ARMV8_PMUV3_PERFCTR_L2D_CACHE_WB), 202 ARMV8_EVENT_ATTR(bus_access, ARMV8_PMUV3_PERFCTR_BUS_ACCESS), 203 ARMV8_EVENT_ATTR(memory_error, ARMV8_PMUV3_PERFCTR_MEMORY_ERROR), 204 ARMV8_EVENT_ATTR(inst_spec, ARMV8_PMUV3_PERFCTR_INST_SPEC), 205 ARMV8_EVENT_ATTR(ttbr_write_retired, ARMV8_PMUV3_PERFCTR_TTBR_WRITE_RETIRED), 206 ARMV8_EVENT_ATTR(bus_cycles, ARMV8_PMUV3_PERFCTR_BUS_CYCLES), 207 /* Don't expose the chain event in /sys, since it's useless in isolation */ 208 ARMV8_EVENT_ATTR(l1d_cache_allocate, ARMV8_PMUV3_PERFCTR_L1D_CACHE_ALLOCATE), 209 ARMV8_EVENT_ATTR(l2d_cache_allocate, ARMV8_PMUV3_PERFCTR_L2D_CACHE_ALLOCATE), 210 ARMV8_EVENT_ATTR(br_retired, ARMV8_PMUV3_PERFCTR_BR_RETIRED), 211 ARMV8_EVENT_ATTR(br_mis_pred_retired, ARMV8_PMUV3_PERFCTR_BR_MIS_PRED_RETIRED), 212 ARMV8_EVENT_ATTR(stall_frontend, ARMV8_PMUV3_PERFCTR_STALL_FRONTEND), 213 ARMV8_EVENT_ATTR(stall_backend, ARMV8_PMUV3_PERFCTR_STALL_BACKEND), 214 ARMV8_EVENT_ATTR(l1d_tlb, ARMV8_PMUV3_PERFCTR_L1D_TLB), 215 ARMV8_EVENT_ATTR(l1i_tlb, ARMV8_PMUV3_PERFCTR_L1I_TLB), 216 ARMV8_EVENT_ATTR(l2i_cache, ARMV8_PMUV3_PERFCTR_L2I_CACHE), 217 ARMV8_EVENT_ATTR(l2i_cache_refill, ARMV8_PMUV3_PERFCTR_L2I_CACHE_REFILL), 218 ARMV8_EVENT_ATTR(l3d_cache_allocate, ARMV8_PMUV3_PERFCTR_L3D_CACHE_ALLOCATE), 219 ARMV8_EVENT_ATTR(l3d_cache_refill, ARMV8_PMUV3_PERFCTR_L3D_CACHE_REFILL), 220 ARMV8_EVENT_ATTR(l3d_cache, ARMV8_PMUV3_PERFCTR_L3D_CACHE), 221 ARMV8_EVENT_ATTR(l3d_cache_wb, ARMV8_PMUV3_PERFCTR_L3D_CACHE_WB), 222 ARMV8_EVENT_ATTR(l2d_tlb_refill, ARMV8_PMUV3_PERFCTR_L2D_TLB_REFILL), 223 ARMV8_EVENT_ATTR(l2i_tlb_refill, ARMV8_PMUV3_PERFCTR_L2I_TLB_REFILL), 224 ARMV8_EVENT_ATTR(l2d_tlb, ARMV8_PMUV3_PERFCTR_L2D_TLB), 225 ARMV8_EVENT_ATTR(l2i_tlb, ARMV8_PMUV3_PERFCTR_L2I_TLB), 226 ARMV8_EVENT_ATTR(remote_access, ARMV8_PMUV3_PERFCTR_REMOTE_ACCESS), 227 ARMV8_EVENT_ATTR(ll_cache, ARMV8_PMUV3_PERFCTR_LL_CACHE), 228 ARMV8_EVENT_ATTR(ll_cache_miss, ARMV8_PMUV3_PERFCTR_LL_CACHE_MISS), 229 ARMV8_EVENT_ATTR(dtlb_walk, ARMV8_PMUV3_PERFCTR_DTLB_WALK), 230 ARMV8_EVENT_ATTR(itlb_walk, ARMV8_PMUV3_PERFCTR_ITLB_WALK), 231 ARMV8_EVENT_ATTR(ll_cache_rd, ARMV8_PMUV3_PERFCTR_LL_CACHE_RD), 232 ARMV8_EVENT_ATTR(ll_cache_miss_rd, ARMV8_PMUV3_PERFCTR_LL_CACHE_MISS_RD), 233 ARMV8_EVENT_ATTR(remote_access_rd, ARMV8_PMUV3_PERFCTR_REMOTE_ACCESS_RD), 234 ARMV8_EVENT_ATTR(l1d_cache_lmiss_rd, ARMV8_PMUV3_PERFCTR_L1D_CACHE_LMISS_RD), 235 ARMV8_EVENT_ATTR(op_retired, ARMV8_PMUV3_PERFCTR_OP_RETIRED), 236 ARMV8_EVENT_ATTR(op_spec, ARMV8_PMUV3_PERFCTR_OP_SPEC), 237 ARMV8_EVENT_ATTR(stall, ARMV8_PMUV3_PERFCTR_STALL), 238 ARMV8_EVENT_ATTR(stall_slot_backend, ARMV8_PMUV3_PERFCTR_STALL_SLOT_BACKEND), 239 ARMV8_EVENT_ATTR(stall_slot_frontend, ARMV8_PMUV3_PERFCTR_STALL_SLOT_FRONTEND), 240 ARMV8_EVENT_ATTR(stall_slot, ARMV8_PMUV3_PERFCTR_STALL_SLOT), 241 ARMV8_EVENT_ATTR(sample_pop, ARMV8_SPE_PERFCTR_SAMPLE_POP), 242 ARMV8_EVENT_ATTR(sample_feed, ARMV8_SPE_PERFCTR_SAMPLE_FEED), 243 ARMV8_EVENT_ATTR(sample_filtrate, ARMV8_SPE_PERFCTR_SAMPLE_FILTRATE), 244 ARMV8_EVENT_ATTR(sample_collision, ARMV8_SPE_PERFCTR_SAMPLE_COLLISION), 245 ARMV8_EVENT_ATTR(cnt_cycles, ARMV8_AMU_PERFCTR_CNT_CYCLES), 246 ARMV8_EVENT_ATTR(stall_backend_mem, ARMV8_AMU_PERFCTR_STALL_BACKEND_MEM), 247 ARMV8_EVENT_ATTR(l1i_cache_lmiss, ARMV8_PMUV3_PERFCTR_L1I_CACHE_LMISS), 248 ARMV8_EVENT_ATTR(l2d_cache_lmiss_rd, ARMV8_PMUV3_PERFCTR_L2D_CACHE_LMISS_RD), 249 ARMV8_EVENT_ATTR(l2i_cache_lmiss, ARMV8_PMUV3_PERFCTR_L2I_CACHE_LMISS), 250 ARMV8_EVENT_ATTR(l3d_cache_lmiss_rd, ARMV8_PMUV3_PERFCTR_L3D_CACHE_LMISS_RD), 251 ARMV8_EVENT_ATTR(trb_wrap, ARMV8_PMUV3_PERFCTR_TRB_WRAP), 252 ARMV8_EVENT_ATTR(trb_trig, ARMV8_PMUV3_PERFCTR_TRB_TRIG), 253 ARMV8_EVENT_ATTR(trcextout0, ARMV8_PMUV3_PERFCTR_TRCEXTOUT0), 254 ARMV8_EVENT_ATTR(trcextout1, ARMV8_PMUV3_PERFCTR_TRCEXTOUT1), 255 ARMV8_EVENT_ATTR(trcextout2, ARMV8_PMUV3_PERFCTR_TRCEXTOUT2), 256 ARMV8_EVENT_ATTR(trcextout3, ARMV8_PMUV3_PERFCTR_TRCEXTOUT3), 257 ARMV8_EVENT_ATTR(cti_trigout4, ARMV8_PMUV3_PERFCTR_CTI_TRIGOUT4), 258 ARMV8_EVENT_ATTR(cti_trigout5, ARMV8_PMUV3_PERFCTR_CTI_TRIGOUT5), 259 ARMV8_EVENT_ATTR(cti_trigout6, ARMV8_PMUV3_PERFCTR_CTI_TRIGOUT6), 260 ARMV8_EVENT_ATTR(cti_trigout7, ARMV8_PMUV3_PERFCTR_CTI_TRIGOUT7), 261 ARMV8_EVENT_ATTR(ldst_align_lat, ARMV8_PMUV3_PERFCTR_LDST_ALIGN_LAT), 262 ARMV8_EVENT_ATTR(ld_align_lat, ARMV8_PMUV3_PERFCTR_LD_ALIGN_LAT), 263 ARMV8_EVENT_ATTR(st_align_lat, ARMV8_PMUV3_PERFCTR_ST_ALIGN_LAT), 264 ARMV8_EVENT_ATTR(mem_access_checked, ARMV8_MTE_PERFCTR_MEM_ACCESS_CHECKED), 265 ARMV8_EVENT_ATTR(mem_access_checked_rd, ARMV8_MTE_PERFCTR_MEM_ACCESS_CHECKED_RD), 266 ARMV8_EVENT_ATTR(mem_access_checked_wr, ARMV8_MTE_PERFCTR_MEM_ACCESS_CHECKED_WR), 267 NULL, 268}; 269 270static umode_t 271armv8pmu_event_attr_is_visible(struct kobject *kobj, 272 struct attribute *attr, int unused) 273{ 274 struct device *dev = kobj_to_dev(kobj); 275 struct pmu *pmu = dev_get_drvdata(dev); 276 struct arm_pmu *cpu_pmu = container_of(pmu, struct arm_pmu, pmu); 277 struct perf_pmu_events_attr *pmu_attr; 278 279 pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr.attr); 280 281 if (pmu_attr->id < ARMV8_PMUV3_MAX_COMMON_EVENTS && 282 test_bit(pmu_attr->id, cpu_pmu->pmceid_bitmap)) 283 return attr->mode; 284 285 if (pmu_attr->id >= ARMV8_PMUV3_EXT_COMMON_EVENT_BASE) { 286 u64 id = pmu_attr->id - ARMV8_PMUV3_EXT_COMMON_EVENT_BASE; 287 288 if (id < ARMV8_PMUV3_MAX_COMMON_EVENTS && 289 test_bit(id, cpu_pmu->pmceid_ext_bitmap)) 290 return attr->mode; 291 } 292 293 return 0; 294} 295 296static const struct attribute_group armv8_pmuv3_events_attr_group = { 297 .name = "events", 298 .attrs = armv8_pmuv3_event_attrs, 299 .is_visible = armv8pmu_event_attr_is_visible, 300}; 301 302/* User ABI */ 303#define ATTR_CFG_FLD_event_CFG config 304#define ATTR_CFG_FLD_event_LO 0 305#define ATTR_CFG_FLD_event_HI 15 306#define ATTR_CFG_FLD_long_CFG config1 307#define ATTR_CFG_FLD_long_LO 0 308#define ATTR_CFG_FLD_long_HI 0 309#define ATTR_CFG_FLD_rdpmc_CFG config1 310#define ATTR_CFG_FLD_rdpmc_LO 1 311#define ATTR_CFG_FLD_rdpmc_HI 1 312#define ATTR_CFG_FLD_threshold_count_CFG config1 /* PMEVTYPER.TC[0] */ 313#define ATTR_CFG_FLD_threshold_count_LO 2 314#define ATTR_CFG_FLD_threshold_count_HI 2 315#define ATTR_CFG_FLD_threshold_compare_CFG config1 /* PMEVTYPER.TC[2:1] */ 316#define ATTR_CFG_FLD_threshold_compare_LO 3 317#define ATTR_CFG_FLD_threshold_compare_HI 4 318#define ATTR_CFG_FLD_threshold_CFG config1 /* PMEVTYPER.TH */ 319#define ATTR_CFG_FLD_threshold_LO 5 320#define ATTR_CFG_FLD_threshold_HI 16 321 322GEN_PMU_FORMAT_ATTR(event); 323GEN_PMU_FORMAT_ATTR(long); 324GEN_PMU_FORMAT_ATTR(rdpmc); 325GEN_PMU_FORMAT_ATTR(threshold_count); 326GEN_PMU_FORMAT_ATTR(threshold_compare); 327GEN_PMU_FORMAT_ATTR(threshold); 328 329static int sysctl_perf_user_access __read_mostly; 330 331static bool armv8pmu_event_is_64bit(struct perf_event *event) 332{ 333 return ATTR_CFG_GET_FLD(&event->attr, long); 334} 335 336static bool armv8pmu_event_want_user_access(struct perf_event *event) 337{ 338 return ATTR_CFG_GET_FLD(&event->attr, rdpmc); 339} 340 341static u8 armv8pmu_event_threshold_control(struct perf_event_attr *attr) 342{ 343 u8 th_compare = ATTR_CFG_GET_FLD(attr, threshold_compare); 344 u8 th_count = ATTR_CFG_GET_FLD(attr, threshold_count); 345 346 /* 347 * The count bit is always the bottom bit of the full control field, and 348 * the comparison is the upper two bits, but it's not explicitly 349 * labelled in the Arm ARM. For the Perf interface we split it into two 350 * fields, so reconstruct it here. 351 */ 352 return (th_compare << 1) | th_count; 353} 354 355static struct attribute *armv8_pmuv3_format_attrs[] = { 356 &format_attr_event.attr, 357 &format_attr_long.attr, 358 &format_attr_rdpmc.attr, 359 &format_attr_threshold.attr, 360 &format_attr_threshold_compare.attr, 361 &format_attr_threshold_count.attr, 362 NULL, 363}; 364 365static const struct attribute_group armv8_pmuv3_format_attr_group = { 366 .name = "format", 367 .attrs = armv8_pmuv3_format_attrs, 368}; 369 370static ssize_t slots_show(struct device *dev, struct device_attribute *attr, 371 char *page) 372{ 373 struct pmu *pmu = dev_get_drvdata(dev); 374 struct arm_pmu *cpu_pmu = container_of(pmu, struct arm_pmu, pmu); 375 u32 slots = FIELD_GET(ARMV8_PMU_SLOTS, cpu_pmu->reg_pmmir); 376 377 return sysfs_emit(page, "0x%08x\n", slots); 378} 379 380static DEVICE_ATTR_RO(slots); 381 382static ssize_t bus_slots_show(struct device *dev, struct device_attribute *attr, 383 char *page) 384{ 385 struct pmu *pmu = dev_get_drvdata(dev); 386 struct arm_pmu *cpu_pmu = container_of(pmu, struct arm_pmu, pmu); 387 u32 bus_slots = FIELD_GET(ARMV8_PMU_BUS_SLOTS, cpu_pmu->reg_pmmir); 388 389 return sysfs_emit(page, "0x%08x\n", bus_slots); 390} 391 392static DEVICE_ATTR_RO(bus_slots); 393 394static ssize_t bus_width_show(struct device *dev, struct device_attribute *attr, 395 char *page) 396{ 397 struct pmu *pmu = dev_get_drvdata(dev); 398 struct arm_pmu *cpu_pmu = container_of(pmu, struct arm_pmu, pmu); 399 u32 bus_width = FIELD_GET(ARMV8_PMU_BUS_WIDTH, cpu_pmu->reg_pmmir); 400 u32 val = 0; 401 402 /* Encoded as Log2(number of bytes), plus one */ 403 if (bus_width > 2 && bus_width < 13) 404 val = 1 << (bus_width - 1); 405 406 return sysfs_emit(page, "0x%08x\n", val); 407} 408 409static DEVICE_ATTR_RO(bus_width); 410 411static u32 threshold_max(struct arm_pmu *cpu_pmu) 412{ 413 /* 414 * PMMIR.THWIDTH is readable and non-zero on aarch32, but it would be 415 * impossible to write the threshold in the upper 32 bits of PMEVTYPER. 416 */ 417 if (IS_ENABLED(CONFIG_ARM)) 418 return 0; 419 420 /* 421 * The largest value that can be written to PMEVTYPER<n>_EL0.TH is 422 * (2 ^ PMMIR.THWIDTH) - 1. 423 */ 424 return (1 << FIELD_GET(ARMV8_PMU_THWIDTH, cpu_pmu->reg_pmmir)) - 1; 425} 426 427static ssize_t threshold_max_show(struct device *dev, 428 struct device_attribute *attr, char *page) 429{ 430 struct pmu *pmu = dev_get_drvdata(dev); 431 struct arm_pmu *cpu_pmu = container_of(pmu, struct arm_pmu, pmu); 432 433 return sysfs_emit(page, "0x%08x\n", threshold_max(cpu_pmu)); 434} 435 436static DEVICE_ATTR_RO(threshold_max); 437 438static struct attribute *armv8_pmuv3_caps_attrs[] = { 439 &dev_attr_slots.attr, 440 &dev_attr_bus_slots.attr, 441 &dev_attr_bus_width.attr, 442 &dev_attr_threshold_max.attr, 443 NULL, 444}; 445 446static const struct attribute_group armv8_pmuv3_caps_attr_group = { 447 .name = "caps", 448 .attrs = armv8_pmuv3_caps_attrs, 449}; 450 451/* 452 * Perf Events' indices 453 */ 454#define ARMV8_IDX_CYCLE_COUNTER 0 455#define ARMV8_IDX_COUNTER0 1 456#define ARMV8_IDX_CYCLE_COUNTER_USER 32 457 458/* 459 * We unconditionally enable ARMv8.5-PMU long event counter support 460 * (64-bit events) where supported. Indicate if this arm_pmu has long 461 * event counter support. 462 * 463 * On AArch32, long counters make no sense (you can't access the top 464 * bits), so we only enable this on AArch64. 465 */ 466static bool armv8pmu_has_long_event(struct arm_pmu *cpu_pmu) 467{ 468 return (IS_ENABLED(CONFIG_ARM64) && is_pmuv3p5(cpu_pmu->pmuver)); 469} 470 471static bool armv8pmu_event_has_user_read(struct perf_event *event) 472{ 473 return event->hw.flags & PERF_EVENT_FLAG_USER_READ_CNT; 474} 475 476/* 477 * We must chain two programmable counters for 64 bit events, 478 * except when we have allocated the 64bit cycle counter (for CPU 479 * cycles event) or when user space counter access is enabled. 480 */ 481static bool armv8pmu_event_is_chained(struct perf_event *event) 482{ 483 int idx = event->hw.idx; 484 struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu); 485 486 return !armv8pmu_event_has_user_read(event) && 487 armv8pmu_event_is_64bit(event) && 488 !armv8pmu_has_long_event(cpu_pmu) && 489 (idx != ARMV8_IDX_CYCLE_COUNTER); 490} 491 492/* 493 * ARMv8 low level PMU access 494 */ 495 496/* 497 * Perf Event to low level counters mapping 498 */ 499#define ARMV8_IDX_TO_COUNTER(x) \ 500 (((x) - ARMV8_IDX_COUNTER0) & ARMV8_PMU_COUNTER_MASK) 501 502static u64 armv8pmu_pmcr_read(void) 503{ 504 return read_pmcr(); 505} 506 507static void armv8pmu_pmcr_write(u64 val) 508{ 509 val &= ARMV8_PMU_PMCR_MASK; 510 isb(); 511 write_pmcr(val); 512} 513 514static int armv8pmu_has_overflowed(u32 pmovsr) 515{ 516 return pmovsr & ARMV8_PMU_OVERFLOWED_MASK; 517} 518 519static int armv8pmu_counter_has_overflowed(u32 pmnc, int idx) 520{ 521 return pmnc & BIT(ARMV8_IDX_TO_COUNTER(idx)); 522} 523 524static u64 armv8pmu_read_evcntr(int idx) 525{ 526 u32 counter = ARMV8_IDX_TO_COUNTER(idx); 527 528 return read_pmevcntrn(counter); 529} 530 531static u64 armv8pmu_read_hw_counter(struct perf_event *event) 532{ 533 int idx = event->hw.idx; 534 u64 val = armv8pmu_read_evcntr(idx); 535 536 if (armv8pmu_event_is_chained(event)) 537 val = (val << 32) | armv8pmu_read_evcntr(idx - 1); 538 return val; 539} 540 541/* 542 * The cycle counter is always a 64-bit counter. When ARMV8_PMU_PMCR_LP 543 * is set the event counters also become 64-bit counters. Unless the 544 * user has requested a long counter (attr.config1) then we want to 545 * interrupt upon 32-bit overflow - we achieve this by applying a bias. 546 */ 547static bool armv8pmu_event_needs_bias(struct perf_event *event) 548{ 549 struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu); 550 struct hw_perf_event *hwc = &event->hw; 551 int idx = hwc->idx; 552 553 if (armv8pmu_event_is_64bit(event)) 554 return false; 555 556 if (armv8pmu_has_long_event(cpu_pmu) || 557 idx == ARMV8_IDX_CYCLE_COUNTER) 558 return true; 559 560 return false; 561} 562 563static u64 armv8pmu_bias_long_counter(struct perf_event *event, u64 value) 564{ 565 if (armv8pmu_event_needs_bias(event)) 566 value |= GENMASK_ULL(63, 32); 567 568 return value; 569} 570 571static u64 armv8pmu_unbias_long_counter(struct perf_event *event, u64 value) 572{ 573 if (armv8pmu_event_needs_bias(event)) 574 value &= ~GENMASK_ULL(63, 32); 575 576 return value; 577} 578 579static u64 armv8pmu_read_counter(struct perf_event *event) 580{ 581 struct hw_perf_event *hwc = &event->hw; 582 int idx = hwc->idx; 583 u64 value; 584 585 if (idx == ARMV8_IDX_CYCLE_COUNTER) 586 value = read_pmccntr(); 587 else 588 value = armv8pmu_read_hw_counter(event); 589 590 return armv8pmu_unbias_long_counter(event, value); 591} 592 593static void armv8pmu_write_evcntr(int idx, u64 value) 594{ 595 u32 counter = ARMV8_IDX_TO_COUNTER(idx); 596 597 write_pmevcntrn(counter, value); 598} 599 600static void armv8pmu_write_hw_counter(struct perf_event *event, 601 u64 value) 602{ 603 int idx = event->hw.idx; 604 605 if (armv8pmu_event_is_chained(event)) { 606 armv8pmu_write_evcntr(idx, upper_32_bits(value)); 607 armv8pmu_write_evcntr(idx - 1, lower_32_bits(value)); 608 } else { 609 armv8pmu_write_evcntr(idx, value); 610 } 611} 612 613static void armv8pmu_write_counter(struct perf_event *event, u64 value) 614{ 615 struct hw_perf_event *hwc = &event->hw; 616 int idx = hwc->idx; 617 618 value = armv8pmu_bias_long_counter(event, value); 619 620 if (idx == ARMV8_IDX_CYCLE_COUNTER) 621 write_pmccntr(value); 622 else 623 armv8pmu_write_hw_counter(event, value); 624} 625 626static void armv8pmu_write_evtype(int idx, unsigned long val) 627{ 628 u32 counter = ARMV8_IDX_TO_COUNTER(idx); 629 unsigned long mask = ARMV8_PMU_EVTYPE_EVENT | 630 ARMV8_PMU_INCLUDE_EL2 | 631 ARMV8_PMU_EXCLUDE_EL0 | 632 ARMV8_PMU_EXCLUDE_EL1; 633 634 if (IS_ENABLED(CONFIG_ARM64)) 635 mask |= ARMV8_PMU_EVTYPE_TC | ARMV8_PMU_EVTYPE_TH; 636 637 val &= mask; 638 write_pmevtypern(counter, val); 639} 640 641static void armv8pmu_write_event_type(struct perf_event *event) 642{ 643 struct hw_perf_event *hwc = &event->hw; 644 int idx = hwc->idx; 645 646 /* 647 * For chained events, the low counter is programmed to count 648 * the event of interest and the high counter is programmed 649 * with CHAIN event code with filters set to count at all ELs. 650 */ 651 if (armv8pmu_event_is_chained(event)) { 652 u32 chain_evt = ARMV8_PMUV3_PERFCTR_CHAIN | 653 ARMV8_PMU_INCLUDE_EL2; 654 655 armv8pmu_write_evtype(idx - 1, hwc->config_base); 656 armv8pmu_write_evtype(idx, chain_evt); 657 } else { 658 if (idx == ARMV8_IDX_CYCLE_COUNTER) 659 write_pmccfiltr(hwc->config_base); 660 else 661 armv8pmu_write_evtype(idx, hwc->config_base); 662 } 663} 664 665static u32 armv8pmu_event_cnten_mask(struct perf_event *event) 666{ 667 int counter = ARMV8_IDX_TO_COUNTER(event->hw.idx); 668 u32 mask = BIT(counter); 669 670 if (armv8pmu_event_is_chained(event)) 671 mask |= BIT(counter - 1); 672 return mask; 673} 674 675static void armv8pmu_enable_counter(u32 mask) 676{ 677 /* 678 * Make sure event configuration register writes are visible before we 679 * enable the counter. 680 * */ 681 isb(); 682 write_pmcntenset(mask); 683} 684 685static void armv8pmu_enable_event_counter(struct perf_event *event) 686{ 687 struct perf_event_attr *attr = &event->attr; 688 u32 mask = armv8pmu_event_cnten_mask(event); 689 690 kvm_set_pmu_events(mask, attr); 691 692 /* We rely on the hypervisor switch code to enable guest counters */ 693 if (!kvm_pmu_counter_deferred(attr)) 694 armv8pmu_enable_counter(mask); 695} 696 697static void armv8pmu_disable_counter(u32 mask) 698{ 699 write_pmcntenclr(mask); 700 /* 701 * Make sure the effects of disabling the counter are visible before we 702 * start configuring the event. 703 */ 704 isb(); 705} 706 707static void armv8pmu_disable_event_counter(struct perf_event *event) 708{ 709 struct perf_event_attr *attr = &event->attr; 710 u32 mask = armv8pmu_event_cnten_mask(event); 711 712 kvm_clr_pmu_events(mask); 713 714 /* We rely on the hypervisor switch code to disable guest counters */ 715 if (!kvm_pmu_counter_deferred(attr)) 716 armv8pmu_disable_counter(mask); 717} 718 719static void armv8pmu_enable_intens(u32 mask) 720{ 721 write_pmintenset(mask); 722} 723 724static void armv8pmu_enable_event_irq(struct perf_event *event) 725{ 726 u32 counter = ARMV8_IDX_TO_COUNTER(event->hw.idx); 727 armv8pmu_enable_intens(BIT(counter)); 728} 729 730static void armv8pmu_disable_intens(u32 mask) 731{ 732 write_pmintenclr(mask); 733 isb(); 734 /* Clear the overflow flag in case an interrupt is pending. */ 735 write_pmovsclr(mask); 736 isb(); 737} 738 739static void armv8pmu_disable_event_irq(struct perf_event *event) 740{ 741 u32 counter = ARMV8_IDX_TO_COUNTER(event->hw.idx); 742 armv8pmu_disable_intens(BIT(counter)); 743} 744 745static u32 armv8pmu_getreset_flags(void) 746{ 747 u32 value; 748 749 /* Read */ 750 value = read_pmovsclr(); 751 752 /* Write to clear flags */ 753 value &= ARMV8_PMU_OVERFLOWED_MASK; 754 write_pmovsclr(value); 755 756 return value; 757} 758 759static void update_pmuserenr(u64 val) 760{ 761 lockdep_assert_irqs_disabled(); 762 763 /* 764 * The current PMUSERENR_EL0 value might be the value for the guest. 765 * If that's the case, have KVM keep tracking of the register value 766 * for the host EL0 so that KVM can restore it before returning to 767 * the host EL0. Otherwise, update the register now. 768 */ 769 if (kvm_set_pmuserenr(val)) 770 return; 771 772 write_pmuserenr(val); 773} 774 775static void armv8pmu_disable_user_access(void) 776{ 777 update_pmuserenr(0); 778} 779 780static void armv8pmu_enable_user_access(struct arm_pmu *cpu_pmu) 781{ 782 int i; 783 struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events); 784 785 /* Clear any unused counters to avoid leaking their contents */ 786 for_each_clear_bit(i, cpuc->used_mask, cpu_pmu->num_events) { 787 if (i == ARMV8_IDX_CYCLE_COUNTER) 788 write_pmccntr(0); 789 else 790 armv8pmu_write_evcntr(i, 0); 791 } 792 793 update_pmuserenr(ARMV8_PMU_USERENR_ER | ARMV8_PMU_USERENR_CR); 794} 795 796static void armv8pmu_enable_event(struct perf_event *event) 797{ 798 /* 799 * Enable counter and interrupt, and set the counter to count 800 * the event that we're interested in. 801 */ 802 armv8pmu_disable_event_counter(event); 803 armv8pmu_write_event_type(event); 804 armv8pmu_enable_event_irq(event); 805 armv8pmu_enable_event_counter(event); 806} 807 808static void armv8pmu_disable_event(struct perf_event *event) 809{ 810 armv8pmu_disable_event_counter(event); 811 armv8pmu_disable_event_irq(event); 812} 813 814static void armv8pmu_start(struct arm_pmu *cpu_pmu) 815{ 816 struct perf_event_context *ctx; 817 int nr_user = 0; 818 819 ctx = perf_cpu_task_ctx(); 820 if (ctx) 821 nr_user = ctx->nr_user; 822 823 if (sysctl_perf_user_access && nr_user) 824 armv8pmu_enable_user_access(cpu_pmu); 825 else 826 armv8pmu_disable_user_access(); 827 828 /* Enable all counters */ 829 armv8pmu_pmcr_write(armv8pmu_pmcr_read() | ARMV8_PMU_PMCR_E); 830 831 kvm_vcpu_pmu_resync_el0(); 832} 833 834static void armv8pmu_stop(struct arm_pmu *cpu_pmu) 835{ 836 /* Disable all counters */ 837 armv8pmu_pmcr_write(armv8pmu_pmcr_read() & ~ARMV8_PMU_PMCR_E); 838} 839 840static irqreturn_t armv8pmu_handle_irq(struct arm_pmu *cpu_pmu) 841{ 842 u32 pmovsr; 843 struct perf_sample_data data; 844 struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events); 845 struct pt_regs *regs; 846 int idx; 847 848 /* 849 * Get and reset the IRQ flags 850 */ 851 pmovsr = armv8pmu_getreset_flags(); 852 853 /* 854 * Did an overflow occur? 855 */ 856 if (!armv8pmu_has_overflowed(pmovsr)) 857 return IRQ_NONE; 858 859 /* 860 * Handle the counter(s) overflow(s) 861 */ 862 regs = get_irq_regs(); 863 864 /* 865 * Stop the PMU while processing the counter overflows 866 * to prevent skews in group events. 867 */ 868 armv8pmu_stop(cpu_pmu); 869 for (idx = 0; idx < cpu_pmu->num_events; ++idx) { 870 struct perf_event *event = cpuc->events[idx]; 871 struct hw_perf_event *hwc; 872 873 /* Ignore if we don't have an event. */ 874 if (!event) 875 continue; 876 877 /* 878 * We have a single interrupt for all counters. Check that 879 * each counter has overflowed before we process it. 880 */ 881 if (!armv8pmu_counter_has_overflowed(pmovsr, idx)) 882 continue; 883 884 hwc = &event->hw; 885 armpmu_event_update(event); 886 perf_sample_data_init(&data, 0, hwc->last_period); 887 if (!armpmu_event_set_period(event)) 888 continue; 889 890 /* 891 * Perf event overflow will queue the processing of the event as 892 * an irq_work which will be taken care of in the handling of 893 * IPI_IRQ_WORK. 894 */ 895 if (perf_event_overflow(event, &data, regs)) 896 cpu_pmu->disable(event); 897 } 898 armv8pmu_start(cpu_pmu); 899 900 return IRQ_HANDLED; 901} 902 903static int armv8pmu_get_single_idx(struct pmu_hw_events *cpuc, 904 struct arm_pmu *cpu_pmu) 905{ 906 int idx; 907 908 for (idx = ARMV8_IDX_COUNTER0; idx < cpu_pmu->num_events; idx++) { 909 if (!test_and_set_bit(idx, cpuc->used_mask)) 910 return idx; 911 } 912 return -EAGAIN; 913} 914 915static int armv8pmu_get_chain_idx(struct pmu_hw_events *cpuc, 916 struct arm_pmu *cpu_pmu) 917{ 918 int idx; 919 920 /* 921 * Chaining requires two consecutive event counters, where 922 * the lower idx must be even. 923 */ 924 for (idx = ARMV8_IDX_COUNTER0 + 1; idx < cpu_pmu->num_events; idx += 2) { 925 if (!test_and_set_bit(idx, cpuc->used_mask)) { 926 /* Check if the preceding even counter is available */ 927 if (!test_and_set_bit(idx - 1, cpuc->used_mask)) 928 return idx; 929 /* Release the Odd counter */ 930 clear_bit(idx, cpuc->used_mask); 931 } 932 } 933 return -EAGAIN; 934} 935 936static int armv8pmu_get_event_idx(struct pmu_hw_events *cpuc, 937 struct perf_event *event) 938{ 939 struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu); 940 struct hw_perf_event *hwc = &event->hw; 941 unsigned long evtype = hwc->config_base & ARMV8_PMU_EVTYPE_EVENT; 942 943 /* Always prefer to place a cycle counter into the cycle counter. */ 944 if (evtype == ARMV8_PMUV3_PERFCTR_CPU_CYCLES) { 945 if (!test_and_set_bit(ARMV8_IDX_CYCLE_COUNTER, cpuc->used_mask)) 946 return ARMV8_IDX_CYCLE_COUNTER; 947 else if (armv8pmu_event_is_64bit(event) && 948 armv8pmu_event_want_user_access(event) && 949 !armv8pmu_has_long_event(cpu_pmu)) 950 return -EAGAIN; 951 } 952 953 /* 954 * Otherwise use events counters 955 */ 956 if (armv8pmu_event_is_chained(event)) 957 return armv8pmu_get_chain_idx(cpuc, cpu_pmu); 958 else 959 return armv8pmu_get_single_idx(cpuc, cpu_pmu); 960} 961 962static void armv8pmu_clear_event_idx(struct pmu_hw_events *cpuc, 963 struct perf_event *event) 964{ 965 int idx = event->hw.idx; 966 967 clear_bit(idx, cpuc->used_mask); 968 if (armv8pmu_event_is_chained(event)) 969 clear_bit(idx - 1, cpuc->used_mask); 970} 971 972static int armv8pmu_user_event_idx(struct perf_event *event) 973{ 974 if (!sysctl_perf_user_access || !armv8pmu_event_has_user_read(event)) 975 return 0; 976 977 /* 978 * We remap the cycle counter index to 32 to 979 * match the offset applied to the rest of 980 * the counter indices. 981 */ 982 if (event->hw.idx == ARMV8_IDX_CYCLE_COUNTER) 983 return ARMV8_IDX_CYCLE_COUNTER_USER; 984 985 return event->hw.idx; 986} 987 988/* 989 * Add an event filter to a given event. 990 */ 991static int armv8pmu_set_event_filter(struct hw_perf_event *event, 992 struct perf_event_attr *attr) 993{ 994 unsigned long config_base = 0; 995 struct perf_event *perf_event = container_of(attr, struct perf_event, 996 attr); 997 struct arm_pmu *cpu_pmu = to_arm_pmu(perf_event->pmu); 998 u32 th; 999 1000 if (attr->exclude_idle) { 1001 pr_debug("ARM performance counters do not support mode exclusion\n"); 1002 return -EOPNOTSUPP; 1003 } 1004 1005 /* 1006 * If we're running in hyp mode, then we *are* the hypervisor. 1007 * Therefore we ignore exclude_hv in this configuration, since 1008 * there's no hypervisor to sample anyway. This is consistent 1009 * with other architectures (x86 and Power). 1010 */ 1011 if (is_kernel_in_hyp_mode()) { 1012 if (!attr->exclude_kernel && !attr->exclude_host) 1013 config_base |= ARMV8_PMU_INCLUDE_EL2; 1014 if (attr->exclude_guest) 1015 config_base |= ARMV8_PMU_EXCLUDE_EL1; 1016 if (attr->exclude_host) 1017 config_base |= ARMV8_PMU_EXCLUDE_EL0; 1018 } else { 1019 if (!attr->exclude_hv && !attr->exclude_host) 1020 config_base |= ARMV8_PMU_INCLUDE_EL2; 1021 } 1022 1023 /* 1024 * Filter out !VHE kernels and guest kernels 1025 */ 1026 if (attr->exclude_kernel) 1027 config_base |= ARMV8_PMU_EXCLUDE_EL1; 1028 1029 if (attr->exclude_user) 1030 config_base |= ARMV8_PMU_EXCLUDE_EL0; 1031 1032 /* 1033 * If FEAT_PMUv3_TH isn't implemented, then THWIDTH (threshold_max) will 1034 * be 0 and will also trigger this check, preventing it from being used. 1035 */ 1036 th = ATTR_CFG_GET_FLD(attr, threshold); 1037 if (th > threshold_max(cpu_pmu)) { 1038 pr_debug("PMU event threshold exceeds max value\n"); 1039 return -EINVAL; 1040 } 1041 1042 if (IS_ENABLED(CONFIG_ARM64) && th) { 1043 config_base |= FIELD_PREP(ARMV8_PMU_EVTYPE_TH, th); 1044 config_base |= FIELD_PREP(ARMV8_PMU_EVTYPE_TC, 1045 armv8pmu_event_threshold_control(attr)); 1046 } 1047 1048 /* 1049 * Install the filter into config_base as this is used to 1050 * construct the event type. 1051 */ 1052 event->config_base = config_base; 1053 1054 return 0; 1055} 1056 1057static void armv8pmu_reset(void *info) 1058{ 1059 struct arm_pmu *cpu_pmu = (struct arm_pmu *)info; 1060 u64 pmcr; 1061 1062 /* The counter and interrupt enable registers are unknown at reset. */ 1063 armv8pmu_disable_counter(U32_MAX); 1064 armv8pmu_disable_intens(U32_MAX); 1065 1066 /* Clear the counters we flip at guest entry/exit */ 1067 kvm_clr_pmu_events(U32_MAX); 1068 1069 /* 1070 * Initialize & Reset PMNC. Request overflow interrupt for 1071 * 64 bit cycle counter but cheat in armv8pmu_write_counter(). 1072 */ 1073 pmcr = ARMV8_PMU_PMCR_P | ARMV8_PMU_PMCR_C | ARMV8_PMU_PMCR_LC; 1074 1075 /* Enable long event counter support where available */ 1076 if (armv8pmu_has_long_event(cpu_pmu)) 1077 pmcr |= ARMV8_PMU_PMCR_LP; 1078 1079 armv8pmu_pmcr_write(pmcr); 1080} 1081 1082static int __armv8_pmuv3_map_event_id(struct arm_pmu *armpmu, 1083 struct perf_event *event) 1084{ 1085 if (event->attr.type == PERF_TYPE_HARDWARE && 1086 event->attr.config == PERF_COUNT_HW_BRANCH_INSTRUCTIONS) { 1087 1088 if (test_bit(ARMV8_PMUV3_PERFCTR_PC_WRITE_RETIRED, 1089 armpmu->pmceid_bitmap)) 1090 return ARMV8_PMUV3_PERFCTR_PC_WRITE_RETIRED; 1091 1092 if (test_bit(ARMV8_PMUV3_PERFCTR_BR_RETIRED, 1093 armpmu->pmceid_bitmap)) 1094 return ARMV8_PMUV3_PERFCTR_BR_RETIRED; 1095 1096 return HW_OP_UNSUPPORTED; 1097 } 1098 1099 return armpmu_map_event(event, &armv8_pmuv3_perf_map, 1100 &armv8_pmuv3_perf_cache_map, 1101 ARMV8_PMU_EVTYPE_EVENT); 1102} 1103 1104static int __armv8_pmuv3_map_event(struct perf_event *event, 1105 const unsigned (*extra_event_map) 1106 [PERF_COUNT_HW_MAX], 1107 const unsigned (*extra_cache_map) 1108 [PERF_COUNT_HW_CACHE_MAX] 1109 [PERF_COUNT_HW_CACHE_OP_MAX] 1110 [PERF_COUNT_HW_CACHE_RESULT_MAX]) 1111{ 1112 int hw_event_id; 1113 struct arm_pmu *armpmu = to_arm_pmu(event->pmu); 1114 1115 hw_event_id = __armv8_pmuv3_map_event_id(armpmu, event); 1116 1117 /* 1118 * CHAIN events only work when paired with an adjacent counter, and it 1119 * never makes sense for a user to open one in isolation, as they'll be 1120 * rotated arbitrarily. 1121 */ 1122 if (hw_event_id == ARMV8_PMUV3_PERFCTR_CHAIN) 1123 return -EINVAL; 1124 1125 if (armv8pmu_event_is_64bit(event)) 1126 event->hw.flags |= ARMPMU_EVT_64BIT; 1127 1128 /* 1129 * User events must be allocated into a single counter, and so 1130 * must not be chained. 1131 * 1132 * Most 64-bit events require long counter support, but 64-bit 1133 * CPU_CYCLES events can be placed into the dedicated cycle 1134 * counter when this is free. 1135 */ 1136 if (armv8pmu_event_want_user_access(event)) { 1137 if (!(event->attach_state & PERF_ATTACH_TASK)) 1138 return -EINVAL; 1139 if (armv8pmu_event_is_64bit(event) && 1140 (hw_event_id != ARMV8_PMUV3_PERFCTR_CPU_CYCLES) && 1141 !armv8pmu_has_long_event(armpmu)) 1142 return -EOPNOTSUPP; 1143 1144 event->hw.flags |= PERF_EVENT_FLAG_USER_READ_CNT; 1145 } 1146 1147 /* Only expose micro/arch events supported by this PMU */ 1148 if ((hw_event_id > 0) && (hw_event_id < ARMV8_PMUV3_MAX_COMMON_EVENTS) 1149 && test_bit(hw_event_id, armpmu->pmceid_bitmap)) { 1150 return hw_event_id; 1151 } 1152 1153 return armpmu_map_event(event, extra_event_map, extra_cache_map, 1154 ARMV8_PMU_EVTYPE_EVENT); 1155} 1156 1157static int armv8_pmuv3_map_event(struct perf_event *event) 1158{ 1159 return __armv8_pmuv3_map_event(event, NULL, NULL); 1160} 1161 1162static int armv8_a53_map_event(struct perf_event *event) 1163{ 1164 return __armv8_pmuv3_map_event(event, NULL, &armv8_a53_perf_cache_map); 1165} 1166 1167static int armv8_a57_map_event(struct perf_event *event) 1168{ 1169 return __armv8_pmuv3_map_event(event, NULL, &armv8_a57_perf_cache_map); 1170} 1171 1172static int armv8_a73_map_event(struct perf_event *event) 1173{ 1174 return __armv8_pmuv3_map_event(event, NULL, &armv8_a73_perf_cache_map); 1175} 1176 1177static int armv8_thunder_map_event(struct perf_event *event) 1178{ 1179 return __armv8_pmuv3_map_event(event, NULL, 1180 &armv8_thunder_perf_cache_map); 1181} 1182 1183static int armv8_vulcan_map_event(struct perf_event *event) 1184{ 1185 return __armv8_pmuv3_map_event(event, NULL, 1186 &armv8_vulcan_perf_cache_map); 1187} 1188 1189struct armv8pmu_probe_info { 1190 struct arm_pmu *pmu; 1191 bool present; 1192}; 1193 1194static void __armv8pmu_probe_pmu(void *info) 1195{ 1196 struct armv8pmu_probe_info *probe = info; 1197 struct arm_pmu *cpu_pmu = probe->pmu; 1198 u64 pmceid_raw[2]; 1199 u32 pmceid[2]; 1200 int pmuver; 1201 1202 pmuver = read_pmuver(); 1203 if (!pmuv3_implemented(pmuver)) 1204 return; 1205 1206 cpu_pmu->pmuver = pmuver; 1207 probe->present = true; 1208 1209 /* Read the nb of CNTx counters supported from PMNC */ 1210 cpu_pmu->num_events = FIELD_GET(ARMV8_PMU_PMCR_N, armv8pmu_pmcr_read()); 1211 1212 /* Add the CPU cycles counter */ 1213 cpu_pmu->num_events += 1; 1214 1215 pmceid[0] = pmceid_raw[0] = read_pmceid0(); 1216 pmceid[1] = pmceid_raw[1] = read_pmceid1(); 1217 1218 bitmap_from_arr32(cpu_pmu->pmceid_bitmap, 1219 pmceid, ARMV8_PMUV3_MAX_COMMON_EVENTS); 1220 1221 pmceid[0] = pmceid_raw[0] >> 32; 1222 pmceid[1] = pmceid_raw[1] >> 32; 1223 1224 bitmap_from_arr32(cpu_pmu->pmceid_ext_bitmap, 1225 pmceid, ARMV8_PMUV3_MAX_COMMON_EVENTS); 1226 1227 /* store PMMIR register for sysfs */ 1228 if (is_pmuv3p4(pmuver)) 1229 cpu_pmu->reg_pmmir = read_pmmir(); 1230 else 1231 cpu_pmu->reg_pmmir = 0; 1232} 1233 1234static int armv8pmu_probe_pmu(struct arm_pmu *cpu_pmu) 1235{ 1236 struct armv8pmu_probe_info probe = { 1237 .pmu = cpu_pmu, 1238 .present = false, 1239 }; 1240 int ret; 1241 1242 ret = smp_call_function_any(&cpu_pmu->supported_cpus, 1243 __armv8pmu_probe_pmu, 1244 &probe, 1); 1245 if (ret) 1246 return ret; 1247 1248 return probe.present ? 0 : -ENODEV; 1249} 1250 1251static void armv8pmu_disable_user_access_ipi(void *unused) 1252{ 1253 armv8pmu_disable_user_access(); 1254} 1255 1256static int armv8pmu_proc_user_access_handler(struct ctl_table *table, int write, 1257 void *buffer, size_t *lenp, loff_t *ppos) 1258{ 1259 int ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 1260 if (ret || !write || sysctl_perf_user_access) 1261 return ret; 1262 1263 on_each_cpu(armv8pmu_disable_user_access_ipi, NULL, 1); 1264 return 0; 1265} 1266 1267static struct ctl_table armv8_pmu_sysctl_table[] = { 1268 { 1269 .procname = "perf_user_access", 1270 .data = &sysctl_perf_user_access, 1271 .maxlen = sizeof(unsigned int), 1272 .mode = 0644, 1273 .proc_handler = armv8pmu_proc_user_access_handler, 1274 .extra1 = SYSCTL_ZERO, 1275 .extra2 = SYSCTL_ONE, 1276 }, 1277}; 1278 1279static void armv8_pmu_register_sysctl_table(void) 1280{ 1281 static u32 tbl_registered = 0; 1282 1283 if (!cmpxchg_relaxed(&tbl_registered, 0, 1)) 1284 register_sysctl("kernel", armv8_pmu_sysctl_table); 1285} 1286 1287static int armv8_pmu_init(struct arm_pmu *cpu_pmu, char *name, 1288 int (*map_event)(struct perf_event *event)) 1289{ 1290 int ret = armv8pmu_probe_pmu(cpu_pmu); 1291 if (ret) 1292 return ret; 1293 1294 cpu_pmu->handle_irq = armv8pmu_handle_irq; 1295 cpu_pmu->enable = armv8pmu_enable_event; 1296 cpu_pmu->disable = armv8pmu_disable_event; 1297 cpu_pmu->read_counter = armv8pmu_read_counter; 1298 cpu_pmu->write_counter = armv8pmu_write_counter; 1299 cpu_pmu->get_event_idx = armv8pmu_get_event_idx; 1300 cpu_pmu->clear_event_idx = armv8pmu_clear_event_idx; 1301 cpu_pmu->start = armv8pmu_start; 1302 cpu_pmu->stop = armv8pmu_stop; 1303 cpu_pmu->reset = armv8pmu_reset; 1304 cpu_pmu->set_event_filter = armv8pmu_set_event_filter; 1305 1306 cpu_pmu->pmu.event_idx = armv8pmu_user_event_idx; 1307 1308 cpu_pmu->name = name; 1309 cpu_pmu->map_event = map_event; 1310 cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_EVENTS] = &armv8_pmuv3_events_attr_group; 1311 cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_FORMATS] = &armv8_pmuv3_format_attr_group; 1312 cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_CAPS] = &armv8_pmuv3_caps_attr_group; 1313 armv8_pmu_register_sysctl_table(); 1314 return 0; 1315} 1316 1317#define PMUV3_INIT_SIMPLE(name) \ 1318static int name##_pmu_init(struct arm_pmu *cpu_pmu) \ 1319{ \ 1320 return armv8_pmu_init(cpu_pmu, #name, armv8_pmuv3_map_event); \ 1321} 1322 1323#define PMUV3_INIT_MAP_EVENT(name, map_event) \ 1324static int name##_pmu_init(struct arm_pmu *cpu_pmu) \ 1325{ \ 1326 return armv8_pmu_init(cpu_pmu, #name, map_event); \ 1327} 1328 1329PMUV3_INIT_SIMPLE(armv8_pmuv3) 1330 1331PMUV3_INIT_SIMPLE(armv8_cortex_a34) 1332PMUV3_INIT_SIMPLE(armv8_cortex_a55) 1333PMUV3_INIT_SIMPLE(armv8_cortex_a65) 1334PMUV3_INIT_SIMPLE(armv8_cortex_a75) 1335PMUV3_INIT_SIMPLE(armv8_cortex_a76) 1336PMUV3_INIT_SIMPLE(armv8_cortex_a77) 1337PMUV3_INIT_SIMPLE(armv8_cortex_a78) 1338PMUV3_INIT_SIMPLE(armv9_cortex_a510) 1339PMUV3_INIT_SIMPLE(armv9_cortex_a520) 1340PMUV3_INIT_SIMPLE(armv9_cortex_a710) 1341PMUV3_INIT_SIMPLE(armv9_cortex_a715) 1342PMUV3_INIT_SIMPLE(armv9_cortex_a720) 1343PMUV3_INIT_SIMPLE(armv8_cortex_x1) 1344PMUV3_INIT_SIMPLE(armv9_cortex_x2) 1345PMUV3_INIT_SIMPLE(armv9_cortex_x3) 1346PMUV3_INIT_SIMPLE(armv9_cortex_x4) 1347PMUV3_INIT_SIMPLE(armv8_neoverse_e1) 1348PMUV3_INIT_SIMPLE(armv8_neoverse_n1) 1349PMUV3_INIT_SIMPLE(armv9_neoverse_n2) 1350PMUV3_INIT_SIMPLE(armv8_neoverse_v1) 1351 1352PMUV3_INIT_SIMPLE(armv8_nvidia_carmel) 1353PMUV3_INIT_SIMPLE(armv8_nvidia_denver) 1354 1355PMUV3_INIT_MAP_EVENT(armv8_cortex_a35, armv8_a53_map_event) 1356PMUV3_INIT_MAP_EVENT(armv8_cortex_a53, armv8_a53_map_event) 1357PMUV3_INIT_MAP_EVENT(armv8_cortex_a57, armv8_a57_map_event) 1358PMUV3_INIT_MAP_EVENT(armv8_cortex_a72, armv8_a57_map_event) 1359PMUV3_INIT_MAP_EVENT(armv8_cortex_a73, armv8_a73_map_event) 1360PMUV3_INIT_MAP_EVENT(armv8_cavium_thunder, armv8_thunder_map_event) 1361PMUV3_INIT_MAP_EVENT(armv8_brcm_vulcan, armv8_vulcan_map_event) 1362 1363static const struct of_device_id armv8_pmu_of_device_ids[] = { 1364 {.compatible = "arm,armv8-pmuv3", .data = armv8_pmuv3_pmu_init}, 1365 {.compatible = "arm,cortex-a34-pmu", .data = armv8_cortex_a34_pmu_init}, 1366 {.compatible = "arm,cortex-a35-pmu", .data = armv8_cortex_a35_pmu_init}, 1367 {.compatible = "arm,cortex-a53-pmu", .data = armv8_cortex_a53_pmu_init}, 1368 {.compatible = "arm,cortex-a55-pmu", .data = armv8_cortex_a55_pmu_init}, 1369 {.compatible = "arm,cortex-a57-pmu", .data = armv8_cortex_a57_pmu_init}, 1370 {.compatible = "arm,cortex-a65-pmu", .data = armv8_cortex_a65_pmu_init}, 1371 {.compatible = "arm,cortex-a72-pmu", .data = armv8_cortex_a72_pmu_init}, 1372 {.compatible = "arm,cortex-a73-pmu", .data = armv8_cortex_a73_pmu_init}, 1373 {.compatible = "arm,cortex-a75-pmu", .data = armv8_cortex_a75_pmu_init}, 1374 {.compatible = "arm,cortex-a76-pmu", .data = armv8_cortex_a76_pmu_init}, 1375 {.compatible = "arm,cortex-a77-pmu", .data = armv8_cortex_a77_pmu_init}, 1376 {.compatible = "arm,cortex-a78-pmu", .data = armv8_cortex_a78_pmu_init}, 1377 {.compatible = "arm,cortex-a510-pmu", .data = armv9_cortex_a510_pmu_init}, 1378 {.compatible = "arm,cortex-a520-pmu", .data = armv9_cortex_a520_pmu_init}, 1379 {.compatible = "arm,cortex-a710-pmu", .data = armv9_cortex_a710_pmu_init}, 1380 {.compatible = "arm,cortex-a715-pmu", .data = armv9_cortex_a715_pmu_init}, 1381 {.compatible = "arm,cortex-a720-pmu", .data = armv9_cortex_a720_pmu_init}, 1382 {.compatible = "arm,cortex-x1-pmu", .data = armv8_cortex_x1_pmu_init}, 1383 {.compatible = "arm,cortex-x2-pmu", .data = armv9_cortex_x2_pmu_init}, 1384 {.compatible = "arm,cortex-x3-pmu", .data = armv9_cortex_x3_pmu_init}, 1385 {.compatible = "arm,cortex-x4-pmu", .data = armv9_cortex_x4_pmu_init}, 1386 {.compatible = "arm,neoverse-e1-pmu", .data = armv8_neoverse_e1_pmu_init}, 1387 {.compatible = "arm,neoverse-n1-pmu", .data = armv8_neoverse_n1_pmu_init}, 1388 {.compatible = "arm,neoverse-n2-pmu", .data = armv9_neoverse_n2_pmu_init}, 1389 {.compatible = "arm,neoverse-v1-pmu", .data = armv8_neoverse_v1_pmu_init}, 1390 {.compatible = "cavium,thunder-pmu", .data = armv8_cavium_thunder_pmu_init}, 1391 {.compatible = "brcm,vulcan-pmu", .data = armv8_brcm_vulcan_pmu_init}, 1392 {.compatible = "nvidia,carmel-pmu", .data = armv8_nvidia_carmel_pmu_init}, 1393 {.compatible = "nvidia,denver-pmu", .data = armv8_nvidia_denver_pmu_init}, 1394 {}, 1395}; 1396 1397static int armv8_pmu_device_probe(struct platform_device *pdev) 1398{ 1399 return arm_pmu_device_probe(pdev, armv8_pmu_of_device_ids, NULL); 1400} 1401 1402static struct platform_driver armv8_pmu_driver = { 1403 .driver = { 1404 .name = ARMV8_PMU_PDEV_NAME, 1405 .of_match_table = armv8_pmu_of_device_ids, 1406 .suppress_bind_attrs = true, 1407 }, 1408 .probe = armv8_pmu_device_probe, 1409}; 1410 1411static int __init armv8_pmu_driver_init(void) 1412{ 1413 int ret; 1414 1415 if (acpi_disabled) 1416 ret = platform_driver_register(&armv8_pmu_driver); 1417 else 1418 ret = arm_pmu_acpi_probe(armv8_pmuv3_pmu_init); 1419 1420 if (!ret) 1421 lockup_detector_retry_init(); 1422 1423 return ret; 1424} 1425device_initcall(armv8_pmu_driver_init) 1426 1427void arch_perf_update_userpage(struct perf_event *event, 1428 struct perf_event_mmap_page *userpg, u64 now) 1429{ 1430 struct clock_read_data *rd; 1431 unsigned int seq; 1432 u64 ns; 1433 1434 userpg->cap_user_time = 0; 1435 userpg->cap_user_time_zero = 0; 1436 userpg->cap_user_time_short = 0; 1437 userpg->cap_user_rdpmc = armv8pmu_event_has_user_read(event); 1438 1439 if (userpg->cap_user_rdpmc) { 1440 if (event->hw.flags & ARMPMU_EVT_64BIT) 1441 userpg->pmc_width = 64; 1442 else 1443 userpg->pmc_width = 32; 1444 } 1445 1446 do { 1447 rd = sched_clock_read_begin(&seq); 1448 1449 if (rd->read_sched_clock != arch_timer_read_counter) 1450 return; 1451 1452 userpg->time_mult = rd->mult; 1453 userpg->time_shift = rd->shift; 1454 userpg->time_zero = rd->epoch_ns; 1455 userpg->time_cycles = rd->epoch_cyc; 1456 userpg->time_mask = rd->sched_clock_mask; 1457 1458 /* 1459 * Subtract the cycle base, such that software that 1460 * doesn't know about cap_user_time_short still 'works' 1461 * assuming no wraps. 1462 */ 1463 ns = mul_u64_u32_shr(rd->epoch_cyc, rd->mult, rd->shift); 1464 userpg->time_zero -= ns; 1465 1466 } while (sched_clock_read_retry(seq)); 1467 1468 userpg->time_offset = userpg->time_zero - now; 1469 1470 /* 1471 * time_shift is not expected to be greater than 31 due to 1472 * the original published conversion algorithm shifting a 1473 * 32-bit value (now specifies a 64-bit value) - refer 1474 * perf_event_mmap_page documentation in perf_event.h. 1475 */ 1476 if (userpg->time_shift == 32) { 1477 userpg->time_shift = 31; 1478 userpg->time_mult >>= 1; 1479 } 1480 1481 /* 1482 * Internal timekeeping for enabled/running/stopped times 1483 * is always computed with the sched_clock. 1484 */ 1485 userpg->cap_user_time = 1; 1486 userpg->cap_user_time_zero = 1; 1487 userpg->cap_user_time_short = 1; 1488} 1489