drivers/perf/arm_pmuv3.c

   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/clocksource.h>
  19 #include <linux/of.h>
  20 #include <linux/perf/arm_pmu.h>
  21 #include <linux/perf/arm_pmuv3.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/sched_clock.h>
  24 #include <linux/smp.h>
  25 #include <linux/nmi.h>
  26
  27 #include <asm/arm_pmuv3.h>
  28
  29 /* ARMv8 Cortex-A53 specific event types. */
  30 #define ARMV8_A53_PERFCTR_PREF_LINEFILL                         0xC2
  31
  32 /* ARMv8 Cavium ThunderX specific event types. */
  33 #define ARMV8_THUNDER_PERFCTR_L1D_CACHE_MISS_ST                 0xE9
  34 #define ARMV8_THUNDER_PERFCTR_L1D_CACHE_PREF_ACCESS             0xEA
  35 #define ARMV8_THUNDER_PERFCTR_L1D_CACHE_PREF_MISS               0xEB
  36 #define ARMV8_THUNDER_PERFCTR_L1I_CACHE_PREF_ACCESS             0xEC
  37 #define ARMV8_THUNDER_PERFCTR_L1I_CACHE_PREF_MISS               0xED
  38
  39 /*
  40  * ARMv8 Architectural defined events, not all of these may
  41  * be supported on any given implementation. Unsupported events will
  42  * be disabled at run-time based on the PMCEID registers.
  43  */
  44 static const unsigned armv8_pmuv3_perf_map[PERF_COUNT_HW_MAX] = {
  45         PERF_MAP_ALL_UNSUPPORTED,
  46         [PERF_COUNT_HW_CPU_CYCLES]              = ARMV8_PMUV3_PERFCTR_CPU_CYCLES,
  47         [PERF_COUNT_HW_INSTRUCTIONS]            = ARMV8_PMUV3_PERFCTR_INST_RETIRED,
  48         [PERF_COUNT_HW_CACHE_REFERENCES]        = ARMV8_PMUV3_PERFCTR_L1D_CACHE,
  49         [PERF_COUNT_HW_CACHE_MISSES]            = ARMV8_PMUV3_PERFCTR_L1D_CACHE_REFILL,
  50         [PERF_COUNT_HW_BRANCH_MISSES]           = ARMV8_PMUV3_PERFCTR_BR_MIS_PRED,
  51         [PERF_COUNT_HW_BUS_CYCLES]              = ARMV8_PMUV3_PERFCTR_BUS_CYCLES,
  52         [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = ARMV8_PMUV3_PERFCTR_STALL_FRONTEND,
  53         [PERF_COUNT_HW_STALLED_CYCLES_BACKEND]  = ARMV8_PMUV3_PERFCTR_STALL_BACKEND,
  54 };
  55
  56 static const unsigned armv8_pmuv3_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
  57                                                 [PERF_COUNT_HW_CACHE_OP_MAX]
  58                                                 [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
  59         PERF_CACHE_MAP_ALL_UNSUPPORTED,
  60
  61         [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)]  = ARMV8_PMUV3_PERFCTR_L1D_CACHE,
  62         [C(L1D)][C(OP_READ)][C(RESULT_MISS)]    = ARMV8_PMUV3_PERFCTR_L1D_CACHE_REFILL,
  63
  64         [C(L1I)][C(OP_READ)][C(RESULT_ACCESS)]  = ARMV8_PMUV3_PERFCTR_L1I_CACHE,
  65         [C(L1I)][C(OP_READ)][C(RESULT_MISS)]    = ARMV8_PMUV3_PERFCTR_L1I_CACHE_REFILL,
  66
  67         [C(DTLB)][C(OP_READ)][C(RESULT_MISS)]   = ARMV8_PMUV3_PERFCTR_L1D_TLB_REFILL,
  68         [C(DTLB)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_L1D_TLB,
  69
  70         [C(ITLB)][C(OP_READ)][C(RESULT_MISS)]   = ARMV8_PMUV3_PERFCTR_L1I_TLB_REFILL,
  71         [C(ITLB)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_L1I_TLB,
  72
  73         [C(LL)][C(OP_READ)][C(RESULT_MISS)]     = ARMV8_PMUV3_PERFCTR_LL_CACHE_MISS_RD,
  74         [C(LL)][C(OP_READ)][C(RESULT_ACCESS)]   = ARMV8_PMUV3_PERFCTR_LL_CACHE_RD,
  75
  76         [C(BPU)][C(OP_READ)][C(RESULT_ACCESS)]  = ARMV8_PMUV3_PERFCTR_BR_PRED,
  77         [C(BPU)][C(OP_READ)][C(RESULT_MISS)]    = ARMV8_PMUV3_PERFCTR_BR_MIS_PRED,
  78 };
  79
  80 static const unsigned armv8_a53_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
  81                                               [PERF_COUNT_HW_CACHE_OP_MAX]
  82                                               [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
  83         PERF_CACHE_MAP_ALL_UNSUPPORTED,
  84
  85         [C(L1D)][C(OP_PREFETCH)][C(RESULT_MISS)] = ARMV8_A53_PERFCTR_PREF_LINEFILL,
  86
  87         [C(NODE)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_RD,
  88         [C(NODE)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_WR,
  89 };
  90
  91 static const unsigned armv8_a57_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
  92                                               [PERF_COUNT_HW_CACHE_OP_MAX]
  93                                               [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
  94         PERF_CACHE_MAP_ALL_UNSUPPORTED,
  95
  96         [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)]  = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_RD,
  97         [C(L1D)][C(OP_READ)][C(RESULT_MISS)]    = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_RD,
  98         [C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WR,
  99         [C(L1D)][C(OP_WRITE)][C(RESULT_MISS)]   = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_WR,
 100
 101         [C(DTLB)][C(OP_READ)][C(RESULT_MISS)]   = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_RD,
 102         [C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)]  = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_WR,
 103
 104         [C(NODE)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_RD,
 105         [C(NODE)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_WR,
 106 };
 107
 108 static const unsigned armv8_a73_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
 109                                               [PERF_COUNT_HW_CACHE_OP_MAX]
 110                                               [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
 111         PERF_CACHE_MAP_ALL_UNSUPPORTED,
 112
 113         [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)]  = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_RD,
 114         [C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WR,
 115 };
 116
 117 static const unsigned armv8_thunder_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
 118                                                    [PERF_COUNT_HW_CACHE_OP_MAX]
 119                                                    [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
 120         PERF_CACHE_MAP_ALL_UNSUPPORTED,
 121
 122         [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)]  = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_RD,
 123         [C(L1D)][C(OP_READ)][C(RESULT_MISS)]    = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_RD,
 124         [C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WR,
 125         [C(L1D)][C(OP_WRITE)][C(RESULT_MISS)]   = ARMV8_THUNDER_PERFCTR_L1D_CACHE_MISS_ST,
 126         [C(L1D)][C(OP_PREFETCH)][C(RESULT_ACCESS)] = ARMV8_THUNDER_PERFCTR_L1D_CACHE_PREF_ACCESS,
 127         [C(L1D)][C(OP_PREFETCH)][C(RESULT_MISS)] = ARMV8_THUNDER_PERFCTR_L1D_CACHE_PREF_MISS,
 128
 129         [C(L1I)][C(OP_PREFETCH)][C(RESULT_ACCESS)] = ARMV8_THUNDER_PERFCTR_L1I_CACHE_PREF_ACCESS,
 130         [C(L1I)][C(OP_PREFETCH)][C(RESULT_MISS)] = ARMV8_THUNDER_PERFCTR_L1I_CACHE_PREF_MISS,
 131
 132         [C(DTLB)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_RD,
 133         [C(DTLB)][C(OP_READ)][C(RESULT_MISS)]   = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_RD,
 134         [C(DTLB)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_WR,
 135         [C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)]  = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_WR,
 136 };
 137
 138 static const unsigned armv8_vulcan_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
 139                                               [PERF_COUNT_HW_CACHE_OP_MAX]
 140                                               [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
 141         PERF_CACHE_MAP_ALL_UNSUPPORTED,
 142
 143         [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)]  = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_RD,
 144         [C(L1D)][C(OP_READ)][C(RESULT_MISS)]    = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_RD,
 145         [C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WR,
 146         [C(L1D)][C(OP_WRITE)][C(RESULT_MISS)]   = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_WR,
 147
 148         [C(DTLB)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_RD,
 149         [C(DTLB)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_WR,
 150         [C(DTLB)][C(OP_READ)][C(RESULT_MISS)]   = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_RD,
 151         [C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)]  = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_WR,
 152
 153         [C(NODE)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_RD,
 154         [C(NODE)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_WR,
 155 };
 156
 157 static ssize_t
 158 armv8pmu_events_sysfs_show(struct device *dev,
 159                            struct device_attribute *attr, char *page)
 160 {
 161         struct perf_pmu_events_attr *pmu_attr;
 162
 163         pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
 164
 165         return sprintf(page, "event=0x%04llx\n", pmu_attr->id);
 166 }
 167
 168 #define ARMV8_EVENT_ATTR(name, config)                                          \
 169         PMU_EVENT_ATTR_ID(name, armv8pmu_events_sysfs_show, config)
 170
 171 static struct attribute *armv8_pmuv3_event_attrs[] = {
 172         /*
 173          * Don't expose the sw_incr event in /sys. It's not usable as writes to
 174          * PMSWINC_EL0 will trap as PMUSERENR.{SW,EN}=={0,0} and event rotation
 175          * means we don't have a fixed event<->counter relationship regardless.
 176          */
 177         ARMV8_EVENT_ATTR(l1i_cache_refill, ARMV8_PMUV3_PERFCTR_L1I_CACHE_REFILL),
 178         ARMV8_EVENT_ATTR(l1i_tlb_refill, ARMV8_PMUV3_PERFCTR_L1I_TLB_REFILL),
 179         ARMV8_EVENT_ATTR(l1d_cache_refill, ARMV8_PMUV3_PERFCTR_L1D_CACHE_REFILL),
 180         ARMV8_EVENT_ATTR(l1d_cache, ARMV8_PMUV3_PERFCTR_L1D_CACHE),
 181         ARMV8_EVENT_ATTR(l1d_tlb_refill, ARMV8_PMUV3_PERFCTR_L1D_TLB_REFILL),
 182         ARMV8_EVENT_ATTR(ld_retired, ARMV8_PMUV3_PERFCTR_LD_RETIRED),
 183         ARMV8_EVENT_ATTR(st_retired, ARMV8_PMUV3_PERFCTR_ST_RETIRED),
 184         ARMV8_EVENT_ATTR(inst_retired, ARMV8_PMUV3_PERFCTR_INST_RETIRED),
 185         ARMV8_EVENT_ATTR(exc_taken, ARMV8_PMUV3_PERFCTR_EXC_TAKEN),
 186         ARMV8_EVENT_ATTR(exc_return, ARMV8_PMUV3_PERFCTR_EXC_RETURN),
 187         ARMV8_EVENT_ATTR(cid_write_retired, ARMV8_PMUV3_PERFCTR_CID_WRITE_RETIRED),
 188         ARMV8_EVENT_ATTR(pc_write_retired, ARMV8_PMUV3_PERFCTR_PC_WRITE_RETIRED),
 189         ARMV8_EVENT_ATTR(br_immed_retired, ARMV8_PMUV3_PERFCTR_BR_IMMED_RETIRED),
 190         ARMV8_EVENT_ATTR(br_return_retired, ARMV8_PMUV3_PERFCTR_BR_RETURN_RETIRED),
 191         ARMV8_EVENT_ATTR(unaligned_ldst_retired, ARMV8_PMUV3_PERFCTR_UNALIGNED_LDST_RETIRED),
 192         ARMV8_EVENT_ATTR(br_mis_pred, ARMV8_PMUV3_PERFCTR_BR_MIS_PRED),
 193         ARMV8_EVENT_ATTR(cpu_cycles, ARMV8_PMUV3_PERFCTR_CPU_CYCLES),
 194         ARMV8_EVENT_ATTR(br_pred, ARMV8_PMUV3_PERFCTR_BR_PRED),
 195         ARMV8_EVENT_ATTR(mem_access, ARMV8_PMUV3_PERFCTR_MEM_ACCESS),
 196         ARMV8_EVENT_ATTR(l1i_cache, ARMV8_PMUV3_PERFCTR_L1I_CACHE),
 197         ARMV8_EVENT_ATTR(l1d_cache_wb, ARMV8_PMUV3_PERFCTR_L1D_CACHE_WB),
 198         ARMV8_EVENT_ATTR(l2d_cache, ARMV8_PMUV3_PERFCTR_L2D_CACHE),
 199         ARMV8_EVENT_ATTR(l2d_cache_refill, ARMV8_PMUV3_PERFCTR_L2D_CACHE_REFILL),
 200         ARMV8_EVENT_ATTR(l2d_cache_wb, ARMV8_PMUV3_PERFCTR_L2D_CACHE_WB),
 201         ARMV8_EVENT_ATTR(bus_access, ARMV8_PMUV3_PERFCTR_BUS_ACCESS),
 202         ARMV8_EVENT_ATTR(memory_error, ARMV8_PMUV3_PERFCTR_MEMORY_ERROR),
 203         ARMV8_EVENT_ATTR(inst_spec, ARMV8_PMUV3_PERFCTR_INST_SPEC),
 204         ARMV8_EVENT_ATTR(ttbr_write_retired, ARMV8_PMUV3_PERFCTR_TTBR_WRITE_RETIRED),
 205         ARMV8_EVENT_ATTR(bus_cycles, ARMV8_PMUV3_PERFCTR_BUS_CYCLES),
 206         /* Don't expose the chain event in /sys, since it's useless in isolation */
 207         ARMV8_EVENT_ATTR(l1d_cache_allocate, ARMV8_PMUV3_PERFCTR_L1D_CACHE_ALLOCATE),
 208         ARMV8_EVENT_ATTR(l2d_cache_allocate, ARMV8_PMUV3_PERFCTR_L2D_CACHE_ALLOCATE),
 209         ARMV8_EVENT_ATTR(br_retired, ARMV8_PMUV3_PERFCTR_BR_RETIRED),
 210         ARMV8_EVENT_ATTR(br_mis_pred_retired, ARMV8_PMUV3_PERFCTR_BR_MIS_PRED_RETIRED),
 211         ARMV8_EVENT_ATTR(stall_frontend, ARMV8_PMUV3_PERFCTR_STALL_FRONTEND),
 212         ARMV8_EVENT_ATTR(stall_backend, ARMV8_PMUV3_PERFCTR_STALL_BACKEND),
 213         ARMV8_EVENT_ATTR(l1d_tlb, ARMV8_PMUV3_PERFCTR_L1D_TLB),
 214         ARMV8_EVENT_ATTR(l1i_tlb, ARMV8_PMUV3_PERFCTR_L1I_TLB),
 215         ARMV8_EVENT_ATTR(l2i_cache, ARMV8_PMUV3_PERFCTR_L2I_CACHE),
 216         ARMV8_EVENT_ATTR(l2i_cache_refill, ARMV8_PMUV3_PERFCTR_L2I_CACHE_REFILL),
 217         ARMV8_EVENT_ATTR(l3d_cache_allocate, ARMV8_PMUV3_PERFCTR_L3D_CACHE_ALLOCATE),
 218         ARMV8_EVENT_ATTR(l3d_cache_refill, ARMV8_PMUV3_PERFCTR_L3D_CACHE_REFILL),
 219         ARMV8_EVENT_ATTR(l3d_cache, ARMV8_PMUV3_PERFCTR_L3D_CACHE),
 220         ARMV8_EVENT_ATTR(l3d_cache_wb, ARMV8_PMUV3_PERFCTR_L3D_CACHE_WB),
 221         ARMV8_EVENT_ATTR(l2d_tlb_refill, ARMV8_PMUV3_PERFCTR_L2D_TLB_REFILL),
 222         ARMV8_EVENT_ATTR(l2i_tlb_refill, ARMV8_PMUV3_PERFCTR_L2I_TLB_REFILL),
 223         ARMV8_EVENT_ATTR(l2d_tlb, ARMV8_PMUV3_PERFCTR_L2D_TLB),
 224         ARMV8_EVENT_ATTR(l2i_tlb, ARMV8_PMUV3_PERFCTR_L2I_TLB),
 225         ARMV8_EVENT_ATTR(remote_access, ARMV8_PMUV3_PERFCTR_REMOTE_ACCESS),
 226         ARMV8_EVENT_ATTR(ll_cache, ARMV8_PMUV3_PERFCTR_LL_CACHE),
 227         ARMV8_EVENT_ATTR(ll_cache_miss, ARMV8_PMUV3_PERFCTR_LL_CACHE_MISS),
 228         ARMV8_EVENT_ATTR(dtlb_walk, ARMV8_PMUV3_PERFCTR_DTLB_WALK),
 229         ARMV8_EVENT_ATTR(itlb_walk, ARMV8_PMUV3_PERFCTR_ITLB_WALK),
 230         ARMV8_EVENT_ATTR(ll_cache_rd, ARMV8_PMUV3_PERFCTR_LL_CACHE_RD),
 231         ARMV8_EVENT_ATTR(ll_cache_miss_rd, ARMV8_PMUV3_PERFCTR_LL_CACHE_MISS_RD),
 232         ARMV8_EVENT_ATTR(remote_access_rd, ARMV8_PMUV3_PERFCTR_REMOTE_ACCESS_RD),
 233         ARMV8_EVENT_ATTR(l1d_cache_lmiss_rd, ARMV8_PMUV3_PERFCTR_L1D_CACHE_LMISS_RD),
 234         ARMV8_EVENT_ATTR(op_retired, ARMV8_PMUV3_PERFCTR_OP_RETIRED),
 235         ARMV8_EVENT_ATTR(op_spec, ARMV8_PMUV3_PERFCTR_OP_SPEC),
 236         ARMV8_EVENT_ATTR(stall, ARMV8_PMUV3_PERFCTR_STALL),
 237         ARMV8_EVENT_ATTR(stall_slot_backend, ARMV8_PMUV3_PERFCTR_STALL_SLOT_BACKEND),
 238         ARMV8_EVENT_ATTR(stall_slot_frontend, ARMV8_PMUV3_PERFCTR_STALL_SLOT_FRONTEND),
 239         ARMV8_EVENT_ATTR(stall_slot, ARMV8_PMUV3_PERFCTR_STALL_SLOT),
 240         ARMV8_EVENT_ATTR(sample_pop, ARMV8_SPE_PERFCTR_SAMPLE_POP),
 241         ARMV8_EVENT_ATTR(sample_feed, ARMV8_SPE_PERFCTR_SAMPLE_FEED),
 242         ARMV8_EVENT_ATTR(sample_filtrate, ARMV8_SPE_PERFCTR_SAMPLE_FILTRATE),
 243         ARMV8_EVENT_ATTR(sample_collision, ARMV8_SPE_PERFCTR_SAMPLE_COLLISION),
 244         ARMV8_EVENT_ATTR(cnt_cycles, ARMV8_AMU_PERFCTR_CNT_CYCLES),
 245         ARMV8_EVENT_ATTR(stall_backend_mem, ARMV8_AMU_PERFCTR_STALL_BACKEND_MEM),
 246         ARMV8_EVENT_ATTR(l1i_cache_lmiss, ARMV8_PMUV3_PERFCTR_L1I_CACHE_LMISS),
 247         ARMV8_EVENT_ATTR(l2d_cache_lmiss_rd, ARMV8_PMUV3_PERFCTR_L2D_CACHE_LMISS_RD),
 248         ARMV8_EVENT_ATTR(l2i_cache_lmiss, ARMV8_PMUV3_PERFCTR_L2I_CACHE_LMISS),
 249         ARMV8_EVENT_ATTR(l3d_cache_lmiss_rd, ARMV8_PMUV3_PERFCTR_L3D_CACHE_LMISS_RD),
 250         ARMV8_EVENT_ATTR(trb_wrap, ARMV8_PMUV3_PERFCTR_TRB_WRAP),
 251         ARMV8_EVENT_ATTR(trb_trig, ARMV8_PMUV3_PERFCTR_TRB_TRIG),
 252         ARMV8_EVENT_ATTR(trcextout0, ARMV8_PMUV3_PERFCTR_TRCEXTOUT0),
 253         ARMV8_EVENT_ATTR(trcextout1, ARMV8_PMUV3_PERFCTR_TRCEXTOUT1),
 254         ARMV8_EVENT_ATTR(trcextout2, ARMV8_PMUV3_PERFCTR_TRCEXTOUT2),
 255         ARMV8_EVENT_ATTR(trcextout3, ARMV8_PMUV3_PERFCTR_TRCEXTOUT3),
 256         ARMV8_EVENT_ATTR(cti_trigout4, ARMV8_PMUV3_PERFCTR_CTI_TRIGOUT4),
 257         ARMV8_EVENT_ATTR(cti_trigout5, ARMV8_PMUV3_PERFCTR_CTI_TRIGOUT5),
 258         ARMV8_EVENT_ATTR(cti_trigout6, ARMV8_PMUV3_PERFCTR_CTI_TRIGOUT6),
 259         ARMV8_EVENT_ATTR(cti_trigout7, ARMV8_PMUV3_PERFCTR_CTI_TRIGOUT7),
 260         ARMV8_EVENT_ATTR(ldst_align_lat, ARMV8_PMUV3_PERFCTR_LDST_ALIGN_LAT),
 261         ARMV8_EVENT_ATTR(ld_align_lat, ARMV8_PMUV3_PERFCTR_LD_ALIGN_LAT),
 262         ARMV8_EVENT_ATTR(st_align_lat, ARMV8_PMUV3_PERFCTR_ST_ALIGN_LAT),
 263         ARMV8_EVENT_ATTR(mem_access_checked, ARMV8_MTE_PERFCTR_MEM_ACCESS_CHECKED),
 264         ARMV8_EVENT_ATTR(mem_access_checked_rd, ARMV8_MTE_PERFCTR_MEM_ACCESS_CHECKED_RD),
 265         ARMV8_EVENT_ATTR(mem_access_checked_wr, ARMV8_MTE_PERFCTR_MEM_ACCESS_CHECKED_WR),
 266         NULL,
 267 };
 268
 269 static umode_t
 270 armv8pmu_event_attr_is_visible(struct kobject *kobj,
 271                                struct attribute *attr, int unused)
 272 {
 273         struct device *dev = kobj_to_dev(kobj);
 274         struct pmu *pmu = dev_get_drvdata(dev);
 275         struct arm_pmu *cpu_pmu = container_of(pmu, struct arm_pmu, pmu);
 276         struct perf_pmu_events_attr *pmu_attr;
 277
 278         pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr.attr);
 279
 280         if (pmu_attr->id < ARMV8_PMUV3_MAX_COMMON_EVENTS &&
 281             test_bit(pmu_attr->id, cpu_pmu->pmceid_bitmap))
 282                 return attr->mode;
 283
 284         if (pmu_attr->id >= ARMV8_PMUV3_EXT_COMMON_EVENT_BASE) {
 285                 u64 id = pmu_attr->id - ARMV8_PMUV3_EXT_COMMON_EVENT_BASE;
 286
 287                 if (id < ARMV8_PMUV3_MAX_COMMON_EVENTS &&
 288                     test_bit(id, cpu_pmu->pmceid_ext_bitmap))
 289                         return attr->mode;
 290         }
 291
 292         return 0;
 293 }
 294
 295 static const struct attribute_group armv8_pmuv3_events_attr_group = {
 296         .name = "events",
 297         .attrs = armv8_pmuv3_event_attrs,
 298         .is_visible = armv8pmu_event_attr_is_visible,
 299 };
 300
 301 PMU_FORMAT_ATTR(event, "config:0-15");
 302 PMU_FORMAT_ATTR(long, "config1:0");
 303 PMU_FORMAT_ATTR(rdpmc, "config1:1");
 304
 305 static int sysctl_perf_user_access __read_mostly;
 306
 307 static bool armv8pmu_event_is_64bit(struct perf_event *event)
 308 {
 309         return event->attr.config1 & 0x1;
 310 }
 311
 312 static bool armv8pmu_event_want_user_access(struct perf_event *event)
 313 {
 314         return event->attr.config1 & 0x2;
 315 }
 316
 317 static struct attribute *armv8_pmuv3_format_attrs[] = {
 318         &format_attr_event.attr,
 319         &format_attr_long.attr,
 320         &format_attr_rdpmc.attr,
 321         NULL,
 322 };
 323
 324 static const struct attribute_group armv8_pmuv3_format_attr_group = {
 325         .name = "format",
 326         .attrs = armv8_pmuv3_format_attrs,
 327 };
 328
 329 static ssize_t slots_show(struct device *dev, struct device_attribute *attr,
 330                           char *page)
 331 {
 332         struct pmu *pmu = dev_get_drvdata(dev);
 333         struct arm_pmu *cpu_pmu = container_of(pmu, struct arm_pmu, pmu);
 334         u32 slots = cpu_pmu->reg_pmmir & ARMV8_PMU_SLOTS_MASK;
 335
 336         return sysfs_emit(page, "0x%08x\n", slots);
 337 }
 338
 339 static DEVICE_ATTR_RO(slots);
 340
 341 static ssize_t bus_slots_show(struct device *dev, struct device_attribute *attr,
 342                               char *page)
 343 {
 344         struct pmu *pmu = dev_get_drvdata(dev);
 345         struct arm_pmu *cpu_pmu = container_of(pmu, struct arm_pmu, pmu);
 346         u32 bus_slots = (cpu_pmu->reg_pmmir >> ARMV8_PMU_BUS_SLOTS_SHIFT)
 347                         & ARMV8_PMU_BUS_SLOTS_MASK;
 348
 349         return sysfs_emit(page, "0x%08x\n", bus_slots);
 350 }
 351
 352 static DEVICE_ATTR_RO(bus_slots);
 353
 354 static ssize_t bus_width_show(struct device *dev, struct device_attribute *attr,
 355                               char *page)
 356 {
 357         struct pmu *pmu = dev_get_drvdata(dev);
 358         struct arm_pmu *cpu_pmu = container_of(pmu, struct arm_pmu, pmu);
 359         u32 bus_width = (cpu_pmu->reg_pmmir >> ARMV8_PMU_BUS_WIDTH_SHIFT)
 360                         & ARMV8_PMU_BUS_WIDTH_MASK;
 361         u32 val = 0;
 362
 363         /* Encoded as Log2(number of bytes), plus one */
 364         if (bus_width > 2 && bus_width < 13)
 365                 val = 1 << (bus_width - 1);
 366
 367         return sysfs_emit(page, "0x%08x\n", val);
 368 }
 369
 370 static DEVICE_ATTR_RO(bus_width);
 371
 372 static struct attribute *armv8_pmuv3_caps_attrs[] = {
 373         &dev_attr_slots.attr,
 374         &dev_attr_bus_slots.attr,
 375         &dev_attr_bus_width.attr,
 376         NULL,
 377 };
 378
 379 static const struct attribute_group armv8_pmuv3_caps_attr_group = {
 380         .name = "caps",
 381         .attrs = armv8_pmuv3_caps_attrs,
 382 };
 383
 384 /*
 385  * Perf Events' indices
 386  */
 387 #define ARMV8_IDX_CYCLE_COUNTER 0
 388 #define ARMV8_IDX_COUNTER0      1
 389 #define ARMV8_IDX_CYCLE_COUNTER_USER    32
 390
 391 /*
 392  * We unconditionally enable ARMv8.5-PMU long event counter support
 393  * (64-bit events) where supported. Indicate if this arm_pmu has long
 394  * event counter support.
 395  *
 396  * On AArch32, long counters make no sense (you can't access the top
 397  * bits), so we only enable this on AArch64.
 398  */
 399 static bool armv8pmu_has_long_event(struct arm_pmu *cpu_pmu)
 400 {
 401         return (IS_ENABLED(CONFIG_ARM64) && is_pmuv3p5(cpu_pmu->pmuver));
 402 }
 403
 404 static bool armv8pmu_event_has_user_read(struct perf_event *event)
 405 {
 406         return event->hw.flags & PERF_EVENT_FLAG_USER_READ_CNT;
 407 }
 408
 409 /*
 410  * We must chain two programmable counters for 64 bit events,
 411  * except when we have allocated the 64bit cycle counter (for CPU
 412  * cycles event) or when user space counter access is enabled.
 413  */
 414 static bool armv8pmu_event_is_chained(struct perf_event *event)
 415 {
 416         int idx = event->hw.idx;
 417         struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
 418
 419         return !armv8pmu_event_has_user_read(event) &&
 420                armv8pmu_event_is_64bit(event) &&
 421                !armv8pmu_has_long_event(cpu_pmu) &&
 422                (idx != ARMV8_IDX_CYCLE_COUNTER);
 423 }
 424
 425 /*
 426  * ARMv8 low level PMU access
 427  */
 428
 429 /*
 430  * Perf Event to low level counters mapping
 431  */
 432 #define ARMV8_IDX_TO_COUNTER(x) \
 433         (((x) - ARMV8_IDX_COUNTER0) & ARMV8_PMU_COUNTER_MASK)
 434
 435 static u64 armv8pmu_pmcr_read(void)
 436 {
 437         return read_pmcr();
 438 }
 439
 440 static void armv8pmu_pmcr_write(u64 val)
 441 {
 442         val &= ARMV8_PMU_PMCR_MASK;
 443         isb();
 444         write_pmcr(val);
 445 }
 446
 447 static int armv8pmu_has_overflowed(u32 pmovsr)
 448 {
 449         return pmovsr & ARMV8_PMU_OVERFLOWED_MASK;
 450 }
 451
 452 static int armv8pmu_counter_has_overflowed(u32 pmnc, int idx)
 453 {
 454         return pmnc & BIT(ARMV8_IDX_TO_COUNTER(idx));
 455 }
 456
 457 static u64 armv8pmu_read_evcntr(int idx)
 458 {
 459         u32 counter = ARMV8_IDX_TO_COUNTER(idx);
 460
 461         return read_pmevcntrn(counter);
 462 }
 463
 464 static u64 armv8pmu_read_hw_counter(struct perf_event *event)
 465 {
 466         int idx = event->hw.idx;
 467         u64 val = armv8pmu_read_evcntr(idx);
 468
 469         if (armv8pmu_event_is_chained(event))
 470                 val = (val << 32) | armv8pmu_read_evcntr(idx - 1);
 471         return val;
 472 }
 473
 474 /*
 475  * The cycle counter is always a 64-bit counter. When ARMV8_PMU_PMCR_LP
 476  * is set the event counters also become 64-bit counters. Unless the
 477  * user has requested a long counter (attr.config1) then we want to
 478  * interrupt upon 32-bit overflow - we achieve this by applying a bias.
 479  */
 480 static bool armv8pmu_event_needs_bias(struct perf_event *event)
 481 {
 482         struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
 483         struct hw_perf_event *hwc = &event->hw;
 484         int idx = hwc->idx;
 485
 486         if (armv8pmu_event_is_64bit(event))
 487                 return false;
 488
 489         if (armv8pmu_has_long_event(cpu_pmu) ||
 490             idx == ARMV8_IDX_CYCLE_COUNTER)
 491                 return true;
 492
 493         return false;
 494 }
 495
 496 static u64 armv8pmu_bias_long_counter(struct perf_event *event, u64 value)
 497 {
 498         if (armv8pmu_event_needs_bias(event))
 499                 value |= GENMASK_ULL(63, 32);
 500
 501         return value;
 502 }
 503
 504 static u64 armv8pmu_unbias_long_counter(struct perf_event *event, u64 value)
 505 {
 506         if (armv8pmu_event_needs_bias(event))
 507                 value &= ~GENMASK_ULL(63, 32);
 508
 509         return value;
 510 }
 511
 512 static u64 armv8pmu_read_counter(struct perf_event *event)
 513 {
 514         struct hw_perf_event *hwc = &event->hw;
 515         int idx = hwc->idx;
 516         u64 value;
 517
 518         if (idx == ARMV8_IDX_CYCLE_COUNTER)
 519                 value = read_pmccntr();
 520         else
 521                 value = armv8pmu_read_hw_counter(event);
 522
 523         return  armv8pmu_unbias_long_counter(event, value);
 524 }
 525
 526 static void armv8pmu_write_evcntr(int idx, u64 value)
 527 {
 528         u32 counter = ARMV8_IDX_TO_COUNTER(idx);
 529
 530         write_pmevcntrn(counter, value);
 531 }
 532
 533 static void armv8pmu_write_hw_counter(struct perf_event *event,
 534                                              u64 value)
 535 {
 536         int idx = event->hw.idx;
 537
 538         if (armv8pmu_event_is_chained(event)) {
 539                 armv8pmu_write_evcntr(idx, upper_32_bits(value));
 540                 armv8pmu_write_evcntr(idx - 1, lower_32_bits(value));
 541         } else {
 542                 armv8pmu_write_evcntr(idx, value);
 543         }
 544 }
 545
 546 static void armv8pmu_write_counter(struct perf_event *event, u64 value)
 547 {
 548         struct hw_perf_event *hwc = &event->hw;
 549         int idx = hwc->idx;
 550
 551         value = armv8pmu_bias_long_counter(event, value);
 552
 553         if (idx == ARMV8_IDX_CYCLE_COUNTER)
 554                 write_pmccntr(value);
 555         else
 556                 armv8pmu_write_hw_counter(event, value);
 557 }
 558
 559 static void armv8pmu_write_evtype(int idx, u32 val)
 560 {
 561         u32 counter = ARMV8_IDX_TO_COUNTER(idx);
 562
 563         val &= ARMV8_PMU_EVTYPE_MASK;
 564         write_pmevtypern(counter, val);
 565 }
 566
 567 static void armv8pmu_write_event_type(struct perf_event *event)
 568 {
 569         struct hw_perf_event *hwc = &event->hw;
 570         int idx = hwc->idx;
 571
 572         /*
 573          * For chained events, the low counter is programmed to count
 574          * the event of interest and the high counter is programmed
 575          * with CHAIN event code with filters set to count at all ELs.
 576          */
 577         if (armv8pmu_event_is_chained(event)) {
 578                 u32 chain_evt = ARMV8_PMUV3_PERFCTR_CHAIN |
 579                                 ARMV8_PMU_INCLUDE_EL2;
 580
 581                 armv8pmu_write_evtype(idx - 1, hwc->config_base);
 582                 armv8pmu_write_evtype(idx, chain_evt);
 583         } else {
 584                 if (idx == ARMV8_IDX_CYCLE_COUNTER)
 585                         write_pmccfiltr(hwc->config_base);
 586                 else
 587                         armv8pmu_write_evtype(idx, hwc->config_base);
 588         }
 589 }
 590
 591 static u32 armv8pmu_event_cnten_mask(struct perf_event *event)
 592 {
 593         int counter = ARMV8_IDX_TO_COUNTER(event->hw.idx);
 594         u32 mask = BIT(counter);
 595
 596         if (armv8pmu_event_is_chained(event))
 597                 mask |= BIT(counter - 1);
 598         return mask;
 599 }
 600
 601 static void armv8pmu_enable_counter(u32 mask)
 602 {
 603         /*
 604          * Make sure event configuration register writes are visible before we
 605          * enable the counter.
 606          * */
 607         isb();
 608         write_pmcntenset(mask);
 609 }
 610
 611 static void armv8pmu_enable_event_counter(struct perf_event *event)
 612 {
 613         struct perf_event_attr *attr = &event->attr;
 614         u32 mask = armv8pmu_event_cnten_mask(event);
 615
 616         kvm_set_pmu_events(mask, attr);
 617
 618         /* We rely on the hypervisor switch code to enable guest counters */
 619         if (!kvm_pmu_counter_deferred(attr))
 620                 armv8pmu_enable_counter(mask);
 621 }
 622
 623 static void armv8pmu_disable_counter(u32 mask)
 624 {
 625         write_pmcntenclr(mask);
 626         /*
 627          * Make sure the effects of disabling the counter are visible before we
 628          * start configuring the event.
 629          */
 630         isb();
 631 }
 632
 633 static void armv8pmu_disable_event_counter(struct perf_event *event)
 634 {
 635         struct perf_event_attr *attr = &event->attr;
 636         u32 mask = armv8pmu_event_cnten_mask(event);
 637
 638         kvm_clr_pmu_events(mask);
 639
 640         /* We rely on the hypervisor switch code to disable guest counters */
 641         if (!kvm_pmu_counter_deferred(attr))
 642                 armv8pmu_disable_counter(mask);
 643 }
 644
 645 static void armv8pmu_enable_intens(u32 mask)
 646 {
 647         write_pmintenset(mask);
 648 }
 649
 650 static void armv8pmu_enable_event_irq(struct perf_event *event)
 651 {
 652         u32 counter = ARMV8_IDX_TO_COUNTER(event->hw.idx);
 653         armv8pmu_enable_intens(BIT(counter));
 654 }
 655
 656 static void armv8pmu_disable_intens(u32 mask)
 657 {
 658         write_pmintenclr(mask);
 659         isb();
 660         /* Clear the overflow flag in case an interrupt is pending. */
 661         write_pmovsclr(mask);
 662         isb();
 663 }
 664
 665 static void armv8pmu_disable_event_irq(struct perf_event *event)
 666 {
 667         u32 counter = ARMV8_IDX_TO_COUNTER(event->hw.idx);
 668         armv8pmu_disable_intens(BIT(counter));
 669 }
 670
 671 static u32 armv8pmu_getreset_flags(void)
 672 {
 673         u32 value;
 674
 675         /* Read */
 676         value = read_pmovsclr();
 677
 678         /* Write to clear flags */
 679         value &= ARMV8_PMU_OVSR_MASK;
 680         write_pmovsclr(value);
 681
 682         return value;
 683 }
 684
 685 static void update_pmuserenr(u64 val)
 686 {
 687         lockdep_assert_irqs_disabled();
 688
 689         /*
 690          * The current PMUSERENR_EL0 value might be the value for the guest.
 691          * If that's the case, have KVM keep tracking of the register value
 692          * for the host EL0 so that KVM can restore it before returning to
 693          * the host EL0. Otherwise, update the register now.
 694          */
 695         if (kvm_set_pmuserenr(val))
 696                 return;
 697
 698         write_pmuserenr(val);
 699 }
 700
 701 static void armv8pmu_disable_user_access(void)
 702 {
 703         update_pmuserenr(0);
 704 }
 705
 706 static void armv8pmu_enable_user_access(struct arm_pmu *cpu_pmu)
 707 {
 708         int i;
 709         struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events);
 710
 711         /* Clear any unused counters to avoid leaking their contents */
 712         for_each_clear_bit(i, cpuc->used_mask, cpu_pmu->num_events) {
 713                 if (i == ARMV8_IDX_CYCLE_COUNTER)
 714                         write_pmccntr(0);
 715                 else
 716                         armv8pmu_write_evcntr(i, 0);
 717         }
 718
 719         update_pmuserenr(ARMV8_PMU_USERENR_ER | ARMV8_PMU_USERENR_CR);
 720 }
 721
 722 static void armv8pmu_enable_event(struct perf_event *event)
 723 {
 724         /*
 725          * Enable counter and interrupt, and set the counter to count
 726          * the event that we're interested in.
 727          */
 728         armv8pmu_disable_event_counter(event);
 729         armv8pmu_write_event_type(event);
 730         armv8pmu_enable_event_irq(event);
 731         armv8pmu_enable_event_counter(event);
 732 }
 733
 734 static void armv8pmu_disable_event(struct perf_event *event)
 735 {
 736         armv8pmu_disable_event_counter(event);
 737         armv8pmu_disable_event_irq(event);
 738 }
 739
 740 static void armv8pmu_start(struct arm_pmu *cpu_pmu)
 741 {
 742         struct perf_event_context *ctx;
 743         int nr_user = 0;
 744
 745         ctx = perf_cpu_task_ctx();
 746         if (ctx)
 747                 nr_user = ctx->nr_user;
 748
 749         if (sysctl_perf_user_access && nr_user)
 750                 armv8pmu_enable_user_access(cpu_pmu);
 751         else
 752                 armv8pmu_disable_user_access();
 753
 754         /* Enable all counters */
 755         armv8pmu_pmcr_write(armv8pmu_pmcr_read() | ARMV8_PMU_PMCR_E);
 756
 757         kvm_vcpu_pmu_resync_el0();
 758 }
 759
 760 static void armv8pmu_stop(struct arm_pmu *cpu_pmu)
 761 {
 762         /* Disable all counters */
 763         armv8pmu_pmcr_write(armv8pmu_pmcr_read() & ~ARMV8_PMU_PMCR_E);
 764 }
 765
 766 static irqreturn_t armv8pmu_handle_irq(struct arm_pmu *cpu_pmu)
 767 {
 768         u32 pmovsr;
 769         struct perf_sample_data data;
 770         struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events);
 771         struct pt_regs *regs;
 772         int idx;
 773
 774         /*
 775          * Get and reset the IRQ flags
 776          */
 777         pmovsr = armv8pmu_getreset_flags();
 778
 779         /*
 780          * Did an overflow occur?
 781          */
 782         if (!armv8pmu_has_overflowed(pmovsr))
 783                 return IRQ_NONE;
 784
 785         /*
 786          * Handle the counter(s) overflow(s)
 787          */
 788         regs = get_irq_regs();
 789
 790         /*
 791          * Stop the PMU while processing the counter overflows
 792          * to prevent skews in group events.
 793          */
 794         armv8pmu_stop(cpu_pmu);
 795         for (idx = 0; idx < cpu_pmu->num_events; ++idx) {
 796                 struct perf_event *event = cpuc->events[idx];
 797                 struct hw_perf_event *hwc;
 798
 799                 /* Ignore if we don't have an event. */
 800                 if (!event)
 801                         continue;
 802
 803                 /*
 804                  * We have a single interrupt for all counters. Check that
 805                  * each counter has overflowed before we process it.
 806                  */
 807                 if (!armv8pmu_counter_has_overflowed(pmovsr, idx))
 808                         continue;
 809
 810                 hwc = &event->hw;
 811                 armpmu_event_update(event);
 812                 perf_sample_data_init(&data, 0, hwc->last_period);
 813                 if (!armpmu_event_set_period(event))
 814                         continue;
 815
 816                 /*
 817                  * Perf event overflow will queue the processing of the event as
 818                  * an irq_work which will be taken care of in the handling of
 819                  * IPI_IRQ_WORK.
 820                  */
 821                 if (perf_event_overflow(event, &data, regs))
 822                         cpu_pmu->disable(event);
 823         }
 824         armv8pmu_start(cpu_pmu);
 825
 826         return IRQ_HANDLED;
 827 }
 828
 829 static int armv8pmu_get_single_idx(struct pmu_hw_events *cpuc,
 830                                     struct arm_pmu *cpu_pmu)
 831 {
 832         int idx;
 833
 834         for (idx = ARMV8_IDX_COUNTER0; idx < cpu_pmu->num_events; idx++) {
 835                 if (!test_and_set_bit(idx, cpuc->used_mask))
 836                         return idx;
 837         }
 838         return -EAGAIN;
 839 }
 840
 841 static int armv8pmu_get_chain_idx(struct pmu_hw_events *cpuc,
 842                                    struct arm_pmu *cpu_pmu)
 843 {
 844         int idx;
 845
 846         /*
 847          * Chaining requires two consecutive event counters, where
 848          * the lower idx must be even.
 849          */
 850         for (idx = ARMV8_IDX_COUNTER0 + 1; idx < cpu_pmu->num_events; idx += 2) {
 851                 if (!test_and_set_bit(idx, cpuc->used_mask)) {
 852                         /* Check if the preceding even counter is available */
 853                         if (!test_and_set_bit(idx - 1, cpuc->used_mask))
 854                                 return idx;
 855                         /* Release the Odd counter */
 856                         clear_bit(idx, cpuc->used_mask);
 857                 }
 858         }
 859         return -EAGAIN;
 860 }
 861
 862 static int armv8pmu_get_event_idx(struct pmu_hw_events *cpuc,
 863                                   struct perf_event *event)
 864 {
 865         struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
 866         struct hw_perf_event *hwc = &event->hw;
 867         unsigned long evtype = hwc->config_base & ARMV8_PMU_EVTYPE_EVENT;
 868
 869         /* Always prefer to place a cycle counter into the cycle counter. */
 870         if (evtype == ARMV8_PMUV3_PERFCTR_CPU_CYCLES) {
 871                 if (!test_and_set_bit(ARMV8_IDX_CYCLE_COUNTER, cpuc->used_mask))
 872                         return ARMV8_IDX_CYCLE_COUNTER;
 873                 else if (armv8pmu_event_is_64bit(event) &&
 874                            armv8pmu_event_want_user_access(event) &&
 875                            !armv8pmu_has_long_event(cpu_pmu))
 876                                 return -EAGAIN;
 877         }
 878
 879         /*
 880          * Otherwise use events counters
 881          */
 882         if (armv8pmu_event_is_chained(event))
 883                 return  armv8pmu_get_chain_idx(cpuc, cpu_pmu);
 884         else
 885                 return armv8pmu_get_single_idx(cpuc, cpu_pmu);
 886 }
 887
 888 static void armv8pmu_clear_event_idx(struct pmu_hw_events *cpuc,
 889                                      struct perf_event *event)
 890 {
 891         int idx = event->hw.idx;
 892
 893         clear_bit(idx, cpuc->used_mask);
 894         if (armv8pmu_event_is_chained(event))
 895                 clear_bit(idx - 1, cpuc->used_mask);
 896 }
 897
 898 static int armv8pmu_user_event_idx(struct perf_event *event)
 899 {
 900         if (!sysctl_perf_user_access || !armv8pmu_event_has_user_read(event))
 901                 return 0;
 902
 903         /*
 904          * We remap the cycle counter index to 32 to
 905          * match the offset applied to the rest of
 906          * the counter indices.
 907          */
 908         if (event->hw.idx == ARMV8_IDX_CYCLE_COUNTER)
 909                 return ARMV8_IDX_CYCLE_COUNTER_USER;
 910
 911         return event->hw.idx;
 912 }
 913
 914 /*
 915  * Add an event filter to a given event.
 916  */
 917 static int armv8pmu_set_event_filter(struct hw_perf_event *event,
 918                                      struct perf_event_attr *attr)
 919 {
 920         unsigned long config_base = 0;
 921
 922         if (attr->exclude_idle)
 923                 return -EPERM;
 924
 925         /*
 926          * If we're running in hyp mode, then we *are* the hypervisor.
 927          * Therefore we ignore exclude_hv in this configuration, since
 928          * there's no hypervisor to sample anyway. This is consistent
 929          * with other architectures (x86 and Power).
 930          */
 931         if (is_kernel_in_hyp_mode()) {
 932                 if (!attr->exclude_kernel && !attr->exclude_host)
 933                         config_base |= ARMV8_PMU_INCLUDE_EL2;
 934                 if (attr->exclude_guest)
 935                         config_base |= ARMV8_PMU_EXCLUDE_EL1;
 936                 if (attr->exclude_host)
 937                         config_base |= ARMV8_PMU_EXCLUDE_EL0;
 938         } else {
 939                 if (!attr->exclude_hv && !attr->exclude_host)
 940                         config_base |= ARMV8_PMU_INCLUDE_EL2;
 941         }
 942
 943         /*
 944          * Filter out !VHE kernels and guest kernels
 945          */
 946         if (attr->exclude_kernel)
 947                 config_base |= ARMV8_PMU_EXCLUDE_EL1;
 948
 949         if (attr->exclude_user)
 950                 config_base |= ARMV8_PMU_EXCLUDE_EL0;
 951
 952         /*
 953          * Install the filter into config_base as this is used to
 954          * construct the event type.
 955          */
 956         event->config_base = config_base;
 957
 958         return 0;
 959 }
 960
 961 static void armv8pmu_reset(void *info)
 962 {
 963         struct arm_pmu *cpu_pmu = (struct arm_pmu *)info;
 964         u64 pmcr;
 965
 966         /* The counter and interrupt enable registers are unknown at reset. */
 967         armv8pmu_disable_counter(U32_MAX);
 968         armv8pmu_disable_intens(U32_MAX);
 969
 970         /* Clear the counters we flip at guest entry/exit */
 971         kvm_clr_pmu_events(U32_MAX);
 972
 973         /*
 974          * Initialize & Reset PMNC. Request overflow interrupt for
 975          * 64 bit cycle counter but cheat in armv8pmu_write_counter().
 976          */
 977         pmcr = ARMV8_PMU_PMCR_P | ARMV8_PMU_PMCR_C | ARMV8_PMU_PMCR_LC;
 978
 979         /* Enable long event counter support where available */
 980         if (armv8pmu_has_long_event(cpu_pmu))
 981                 pmcr |= ARMV8_PMU_PMCR_LP;
 982
 983         armv8pmu_pmcr_write(pmcr);
 984 }
 985
 986 static int __armv8_pmuv3_map_event_id(struct arm_pmu *armpmu,
 987                                       struct perf_event *event)
 988 {
 989         if (event->attr.type == PERF_TYPE_HARDWARE &&
 990             event->attr.config == PERF_COUNT_HW_BRANCH_INSTRUCTIONS) {
 991
 992                 if (test_bit(ARMV8_PMUV3_PERFCTR_PC_WRITE_RETIRED,
 993                              armpmu->pmceid_bitmap))
 994                         return ARMV8_PMUV3_PERFCTR_PC_WRITE_RETIRED;
 995
 996                 if (test_bit(ARMV8_PMUV3_PERFCTR_BR_RETIRED,
 997                              armpmu->pmceid_bitmap))
 998                         return ARMV8_PMUV3_PERFCTR_BR_RETIRED;
 999
1000                 return HW_OP_UNSUPPORTED;
1001         }
1002
1003         return armpmu_map_event(event, &armv8_pmuv3_perf_map,
1004                                 &armv8_pmuv3_perf_cache_map,
1005                                 ARMV8_PMU_EVTYPE_EVENT);
1006 }
1007
1008 static int __armv8_pmuv3_map_event(struct perf_event *event,
1009                                    const unsigned (*extra_event_map)
1010                                                   [PERF_COUNT_HW_MAX],
1011                                    const unsigned (*extra_cache_map)
1012                                                   [PERF_COUNT_HW_CACHE_MAX]
1013                                                   [PERF_COUNT_HW_CACHE_OP_MAX]
1014                                                   [PERF_COUNT_HW_CACHE_RESULT_MAX])
1015 {
1016         int hw_event_id;
1017         struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
1018
1019         hw_event_id = __armv8_pmuv3_map_event_id(armpmu, event);
1020
1021         /*
1022          * CHAIN events only work when paired with an adjacent counter, and it
1023          * never makes sense for a user to open one in isolation, as they'll be
1024          * rotated arbitrarily.
1025          */
1026         if (hw_event_id == ARMV8_PMUV3_PERFCTR_CHAIN)
1027                 return -EINVAL;
1028
1029         if (armv8pmu_event_is_64bit(event))
1030                 event->hw.flags |= ARMPMU_EVT_64BIT;
1031
1032         /*
1033          * User events must be allocated into a single counter, and so
1034          * must not be chained.
1035          *
1036          * Most 64-bit events require long counter support, but 64-bit
1037          * CPU_CYCLES events can be placed into the dedicated cycle
1038          * counter when this is free.
1039          */
1040         if (armv8pmu_event_want_user_access(event)) {
1041                 if (!(event->attach_state & PERF_ATTACH_TASK))
1042                         return -EINVAL;
1043                 if (armv8pmu_event_is_64bit(event) &&
1044                     (hw_event_id != ARMV8_PMUV3_PERFCTR_CPU_CYCLES) &&
1045                     !armv8pmu_has_long_event(armpmu))
1046                         return -EOPNOTSUPP;
1047
1048                 event->hw.flags |= PERF_EVENT_FLAG_USER_READ_CNT;
1049         }
1050
1051         /* Only expose micro/arch events supported by this PMU */
1052         if ((hw_event_id > 0) && (hw_event_id < ARMV8_PMUV3_MAX_COMMON_EVENTS)
1053             && test_bit(hw_event_id, armpmu->pmceid_bitmap)) {
1054                 return hw_event_id;
1055         }
1056
1057         return armpmu_map_event(event, extra_event_map, extra_cache_map,
1058                                 ARMV8_PMU_EVTYPE_EVENT);
1059 }
1060
1061 static int armv8_pmuv3_map_event(struct perf_event *event)
1062 {
1063         return __armv8_pmuv3_map_event(event, NULL, NULL);
1064 }
1065
1066 static int armv8_a53_map_event(struct perf_event *event)
1067 {
1068         return __armv8_pmuv3_map_event(event, NULL, &armv8_a53_perf_cache_map);
1069 }
1070
1071 static int armv8_a57_map_event(struct perf_event *event)
1072 {
1073         return __armv8_pmuv3_map_event(event, NULL, &armv8_a57_perf_cache_map);
1074 }
1075
1076 static int armv8_a73_map_event(struct perf_event *event)
1077 {
1078         return __armv8_pmuv3_map_event(event, NULL, &armv8_a73_perf_cache_map);
1079 }
1080
1081 static int armv8_thunder_map_event(struct perf_event *event)
1082 {
1083         return __armv8_pmuv3_map_event(event, NULL,
1084                                        &armv8_thunder_perf_cache_map);
1085 }
1086
1087 static int armv8_vulcan_map_event(struct perf_event *event)
1088 {
1089         return __armv8_pmuv3_map_event(event, NULL,
1090                                        &armv8_vulcan_perf_cache_map);
1091 }
1092
1093 struct armv8pmu_probe_info {
1094         struct arm_pmu *pmu;
1095         bool present;
1096 };
1097
1098 static void __armv8pmu_probe_pmu(void *info)
1099 {
1100         struct armv8pmu_probe_info *probe = info;
1101         struct arm_pmu *cpu_pmu = probe->pmu;
1102         u64 pmceid_raw[2];
1103         u32 pmceid[2];
1104         int pmuver;
1105
1106         pmuver = read_pmuver();
1107         if (!pmuv3_implemented(pmuver))
1108                 return;
1109
1110         cpu_pmu->pmuver = pmuver;
1111         probe->present = true;
1112
1113         /* Read the nb of CNTx counters supported from PMNC */
1114         cpu_pmu->num_events = (armv8pmu_pmcr_read() >> ARMV8_PMU_PMCR_N_SHIFT)
1115                 & ARMV8_PMU_PMCR_N_MASK;
1116
1117         /* Add the CPU cycles counter */
1118         cpu_pmu->num_events += 1;
1119
1120         pmceid[0] = pmceid_raw[0] = read_pmceid0();
1121         pmceid[1] = pmceid_raw[1] = read_pmceid1();
1122
1123         bitmap_from_arr32(cpu_pmu->pmceid_bitmap,
1124                              pmceid, ARMV8_PMUV3_MAX_COMMON_EVENTS);
1125
1126         pmceid[0] = pmceid_raw[0] >> 32;
1127         pmceid[1] = pmceid_raw[1] >> 32;
1128
1129         bitmap_from_arr32(cpu_pmu->pmceid_ext_bitmap,
1130                              pmceid, ARMV8_PMUV3_MAX_COMMON_EVENTS);
1131
1132         /* store PMMIR register for sysfs */
1133         if (is_pmuv3p4(pmuver))
1134                 cpu_pmu->reg_pmmir = read_pmmir();
1135         else
1136                 cpu_pmu->reg_pmmir = 0;
1137 }
1138
1139 static int armv8pmu_probe_pmu(struct arm_pmu *cpu_pmu)
1140 {
1141         struct armv8pmu_probe_info probe = {
1142                 .pmu = cpu_pmu,
1143                 .present = false,
1144         };
1145         int ret;
1146
1147         ret = smp_call_function_any(&cpu_pmu->supported_cpus,
1148                                     __armv8pmu_probe_pmu,
1149                                     &probe, 1);
1150         if (ret)
1151                 return ret;
1152
1153         return probe.present ? 0 : -ENODEV;
1154 }
1155
1156 static void armv8pmu_disable_user_access_ipi(void *unused)
1157 {
1158         armv8pmu_disable_user_access();
1159 }
1160
1161 static int armv8pmu_proc_user_access_handler(struct ctl_table *table, int write,
1162                 void *buffer, size_t *lenp, loff_t *ppos)
1163 {
1164         int ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1165         if (ret || !write || sysctl_perf_user_access)
1166                 return ret;
1167
1168         on_each_cpu(armv8pmu_disable_user_access_ipi, NULL, 1);
1169         return 0;
1170 }
1171
1172 static struct ctl_table armv8_pmu_sysctl_table[] = {
1173         {
1174                 .procname       = "perf_user_access",
1175                 .data           = &sysctl_perf_user_access,
1176                 .maxlen         = sizeof(unsigned int),
1177                 .mode           = 0644,
1178                 .proc_handler   = armv8pmu_proc_user_access_handler,
1179                 .extra1         = SYSCTL_ZERO,
1180                 .extra2         = SYSCTL_ONE,
1181         },
1182 };
1183
1184 static void armv8_pmu_register_sysctl_table(void)
1185 {
1186         static u32 tbl_registered = 0;
1187
1188         if (!cmpxchg_relaxed(&tbl_registered, 0, 1))
1189                 register_sysctl("kernel", armv8_pmu_sysctl_table);
1190 }
1191
1192 static int armv8_pmu_init(struct arm_pmu *cpu_pmu, char *name,
1193                           int (*map_event)(struct perf_event *event))
1194 {
1195         int ret = armv8pmu_probe_pmu(cpu_pmu);
1196         if (ret)
1197                 return ret;
1198
1199         cpu_pmu->handle_irq             = armv8pmu_handle_irq;
1200         cpu_pmu->enable                 = armv8pmu_enable_event;
1201         cpu_pmu->disable                = armv8pmu_disable_event;
1202         cpu_pmu->read_counter           = armv8pmu_read_counter;
1203         cpu_pmu->write_counter          = armv8pmu_write_counter;
1204         cpu_pmu->get_event_idx          = armv8pmu_get_event_idx;
1205         cpu_pmu->clear_event_idx        = armv8pmu_clear_event_idx;
1206         cpu_pmu->start                  = armv8pmu_start;
1207         cpu_pmu->stop                   = armv8pmu_stop;
1208         cpu_pmu->reset                  = armv8pmu_reset;
1209         cpu_pmu->set_event_filter       = armv8pmu_set_event_filter;
1210
1211         cpu_pmu->pmu.event_idx          = armv8pmu_user_event_idx;
1212
1213         cpu_pmu->name                   = name;
1214         cpu_pmu->map_event              = map_event;
1215         cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_EVENTS] = &armv8_pmuv3_events_attr_group;
1216         cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_FORMATS] = &armv8_pmuv3_format_attr_group;
1217         cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_CAPS] = &armv8_pmuv3_caps_attr_group;
1218         armv8_pmu_register_sysctl_table();
1219         return 0;
1220 }
1221
1222 #define PMUV3_INIT_SIMPLE(name)                                         \
1223 static int name##_pmu_init(struct arm_pmu *cpu_pmu)                     \
1224 {                                                                       \
1225         return armv8_pmu_init(cpu_pmu, #name, armv8_pmuv3_map_event);   \
1226 }
1227
1228 #define PMUV3_INIT_MAP_EVENT(name, map_event)                           \
1229 static int name##_pmu_init(struct arm_pmu *cpu_pmu)                     \
1230 {                                                                       \
1231         return armv8_pmu_init(cpu_pmu, #name, map_event);               \
1232 }
1233
1234 PMUV3_INIT_SIMPLE(armv8_pmuv3)
1235
1236 PMUV3_INIT_SIMPLE(armv8_cortex_a34)
1237 PMUV3_INIT_SIMPLE(armv8_cortex_a55)
1238 PMUV3_INIT_SIMPLE(armv8_cortex_a65)
1239 PMUV3_INIT_SIMPLE(armv8_cortex_a75)
1240 PMUV3_INIT_SIMPLE(armv8_cortex_a76)
1241 PMUV3_INIT_SIMPLE(armv8_cortex_a77)
1242 PMUV3_INIT_SIMPLE(armv8_cortex_a78)
1243 PMUV3_INIT_SIMPLE(armv9_cortex_a510)
1244 PMUV3_INIT_SIMPLE(armv9_cortex_a520)
1245 PMUV3_INIT_SIMPLE(armv9_cortex_a710)
1246 PMUV3_INIT_SIMPLE(armv9_cortex_a715)
1247 PMUV3_INIT_SIMPLE(armv9_cortex_a720)
1248 PMUV3_INIT_SIMPLE(armv8_cortex_x1)
1249 PMUV3_INIT_SIMPLE(armv9_cortex_x2)
1250 PMUV3_INIT_SIMPLE(armv9_cortex_x3)
1251 PMUV3_INIT_SIMPLE(armv9_cortex_x4)
1252 PMUV3_INIT_SIMPLE(armv8_neoverse_e1)
1253 PMUV3_INIT_SIMPLE(armv8_neoverse_n1)
1254 PMUV3_INIT_SIMPLE(armv9_neoverse_n2)
1255 PMUV3_INIT_SIMPLE(armv8_neoverse_v1)
1256
1257 PMUV3_INIT_SIMPLE(armv8_nvidia_carmel)
1258 PMUV3_INIT_SIMPLE(armv8_nvidia_denver)
1259
1260 PMUV3_INIT_MAP_EVENT(armv8_cortex_a35, armv8_a53_map_event)
1261 PMUV3_INIT_MAP_EVENT(armv8_cortex_a53, armv8_a53_map_event)
1262 PMUV3_INIT_MAP_EVENT(armv8_cortex_a57, armv8_a57_map_event)
1263 PMUV3_INIT_MAP_EVENT(armv8_cortex_a72, armv8_a57_map_event)
1264 PMUV3_INIT_MAP_EVENT(armv8_cortex_a73, armv8_a73_map_event)
1265 PMUV3_INIT_MAP_EVENT(armv8_cavium_thunder, armv8_thunder_map_event)
1266 PMUV3_INIT_MAP_EVENT(armv8_brcm_vulcan, armv8_vulcan_map_event)
1267
1268 static const struct of_device_id armv8_pmu_of_device_ids[] = {
1269         {.compatible = "arm,armv8-pmuv3",       .data = armv8_pmuv3_pmu_init},
1270         {.compatible = "arm,cortex-a34-pmu",    .data = armv8_cortex_a34_pmu_init},
1271         {.compatible = "arm,cortex-a35-pmu",    .data = armv8_cortex_a35_pmu_init},
1272         {.compatible = "arm,cortex-a53-pmu",    .data = armv8_cortex_a53_pmu_init},
1273         {.compatible = "arm,cortex-a55-pmu",    .data = armv8_cortex_a55_pmu_init},
1274         {.compatible = "arm,cortex-a57-pmu",    .data = armv8_cortex_a57_pmu_init},
1275         {.compatible = "arm,cortex-a65-pmu",    .data = armv8_cortex_a65_pmu_init},
1276         {.compatible = "arm,cortex-a72-pmu",    .data = armv8_cortex_a72_pmu_init},
1277         {.compatible = "arm,cortex-a73-pmu",    .data = armv8_cortex_a73_pmu_init},
1278         {.compatible = "arm,cortex-a75-pmu",    .data = armv8_cortex_a75_pmu_init},
1279         {.compatible = "arm,cortex-a76-pmu",    .data = armv8_cortex_a76_pmu_init},
1280         {.compatible = "arm,cortex-a77-pmu",    .data = armv8_cortex_a77_pmu_init},
1281         {.compatible = "arm,cortex-a78-pmu",    .data = armv8_cortex_a78_pmu_init},
1282         {.compatible = "arm,cortex-a510-pmu",   .data = armv9_cortex_a510_pmu_init},
1283         {.compatible = "arm,cortex-a520-pmu",   .data = armv9_cortex_a520_pmu_init},
1284         {.compatible = "arm,cortex-a710-pmu",   .data = armv9_cortex_a710_pmu_init},
1285         {.compatible = "arm,cortex-a715-pmu",   .data = armv9_cortex_a715_pmu_init},
1286         {.compatible = "arm,cortex-a720-pmu",   .data = armv9_cortex_a720_pmu_init},
1287         {.compatible = "arm,cortex-x1-pmu",     .data = armv8_cortex_x1_pmu_init},
1288         {.compatible = "arm,cortex-x2-pmu",     .data = armv9_cortex_x2_pmu_init},
1289         {.compatible = "arm,cortex-x3-pmu",     .data = armv9_cortex_x3_pmu_init},
1290         {.compatible = "arm,cortex-x4-pmu",     .data = armv9_cortex_x4_pmu_init},
1291         {.compatible = "arm,neoverse-e1-pmu",   .data = armv8_neoverse_e1_pmu_init},
1292         {.compatible = "arm,neoverse-n1-pmu",   .data = armv8_neoverse_n1_pmu_init},
1293         {.compatible = "arm,neoverse-n2-pmu",   .data = armv9_neoverse_n2_pmu_init},
1294         {.compatible = "arm,neoverse-v1-pmu",   .data = armv8_neoverse_v1_pmu_init},
1295         {.compatible = "cavium,thunder-pmu",    .data = armv8_cavium_thunder_pmu_init},
1296         {.compatible = "brcm,vulcan-pmu",       .data = armv8_brcm_vulcan_pmu_init},
1297         {.compatible = "nvidia,carmel-pmu",     .data = armv8_nvidia_carmel_pmu_init},
1298         {.compatible = "nvidia,denver-pmu",     .data = armv8_nvidia_denver_pmu_init},
1299         {},
1300 };
1301
1302 static int armv8_pmu_device_probe(struct platform_device *pdev)
1303 {
1304         return arm_pmu_device_probe(pdev, armv8_pmu_of_device_ids, NULL);
1305 }
1306
1307 static struct platform_driver armv8_pmu_driver = {
1308         .driver         = {
1309                 .name   = ARMV8_PMU_PDEV_NAME,
1310                 .of_match_table = armv8_pmu_of_device_ids,
1311                 .suppress_bind_attrs = true,
1312         },
1313         .probe          = armv8_pmu_device_probe,
1314 };
1315
1316 static int __init armv8_pmu_driver_init(void)
1317 {
1318         int ret;
1319
1320         if (acpi_disabled)
1321                 ret = platform_driver_register(&armv8_pmu_driver);
1322         else
1323                 ret = arm_pmu_acpi_probe(armv8_pmuv3_pmu_init);
1324
1325         if (!ret)
1326                 lockup_detector_retry_init();
1327
1328         return ret;
1329 }
1330 device_initcall(armv8_pmu_driver_init)
1331
1332 void arch_perf_update_userpage(struct perf_event *event,
1333                                struct perf_event_mmap_page *userpg, u64 now)
1334 {
1335         struct clock_read_data *rd;
1336         unsigned int seq;
1337         u64 ns;
1338
1339         userpg->cap_user_time = 0;
1340         userpg->cap_user_time_zero = 0;
1341         userpg->cap_user_time_short = 0;
1342         userpg->cap_user_rdpmc = armv8pmu_event_has_user_read(event);
1343
1344         if (userpg->cap_user_rdpmc) {
1345                 if (event->hw.flags & ARMPMU_EVT_64BIT)
1346                         userpg->pmc_width = 64;
1347                 else
1348                         userpg->pmc_width = 32;
1349         }
1350
1351         do {
1352                 rd = sched_clock_read_begin(&seq);
1353
1354                 if (rd->read_sched_clock != arch_timer_read_counter)
1355                         return;
1356
1357                 userpg->time_mult = rd->mult;
1358                 userpg->time_shift = rd->shift;
1359                 userpg->time_zero = rd->epoch_ns;
1360                 userpg->time_cycles = rd->epoch_cyc;
1361                 userpg->time_mask = rd->sched_clock_mask;
1362
1363                 /*
1364                  * Subtract the cycle base, such that software that
1365                  * doesn't know about cap_user_time_short still 'works'
1366                  * assuming no wraps.
1367                  */
1368                 ns = mul_u64_u32_shr(rd->epoch_cyc, rd->mult, rd->shift);
1369                 userpg->time_zero -= ns;
1370
1371         } while (sched_clock_read_retry(seq));
1372
1373         userpg->time_offset = userpg->time_zero - now;
1374
1375         /*
1376          * time_shift is not expected to be greater than 31 due to
1377          * the original published conversion algorithm shifting a
1378          * 32-bit value (now specifies a 64-bit value) - refer
1379          * perf_event_mmap_page documentation in perf_event.h.
1380          */
1381         if (userpg->time_shift == 32) {
1382                 userpg->time_shift = 31;
1383                 userpg->time_mult >>= 1;
1384         }
1385
1386         /*
1387          * Internal timekeeping for enabled/running/stopped times
1388          * is always computed with the sched_clock.
1389          */
1390         userpg->cap_user_time = 1;
1391         userpg->cap_user_time_zero = 1;
1392         userpg->cap_user_time_short = 1;
1393 }