WIP FPC-III support

[linux/fpc-iii.git] / arch / arm64 / kernel / perf_event.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * ARMv8 PMUv3 Performance Events handling code.
 *
 * Copyright (C) 2012 ARM Limited
 * Author: Will Deacon <will.deacon@arm.com>
 *
 * This code is based heavily on the ARMv7 perf event code.
 */

#include <asm/irq_regs.h>
#include <asm/perf_event.h>
#include <asm/sysreg.h>
#include <asm/virt.h>

#include <clocksource/arm_arch_timer.h>

#include <linux/acpi.h>
#include <linux/clocksource.h>
#include <linux/kvm_host.h>
#include <linux/of.h>
#include <linux/perf/arm_pmu.h>
#include <linux/platform_device.h>
#include <linux/sched_clock.h>
#include <linux/smp.h>
#include <linux/nmi.h>
#include <linux/cpufreq.h>

/* ARMv8 Cortex-A53 specific event types. */
#define ARMV8_A53_PERFCTR_PREF_LINEFILL                         0xC2

/* ARMv8 Cavium ThunderX specific event types. */
#define ARMV8_THUNDER_PERFCTR_L1D_CACHE_MISS_ST                 0xE9
#define ARMV8_THUNDER_PERFCTR_L1D_CACHE_PREF_ACCESS             0xEA
#define ARMV8_THUNDER_PERFCTR_L1D_CACHE_PREF_MISS               0xEB
#define ARMV8_THUNDER_PERFCTR_L1I_CACHE_PREF_ACCESS             0xEC
#define ARMV8_THUNDER_PERFCTR_L1I_CACHE_PREF_MISS               0xED

/*
 * ARMv8 Architectural defined events, not all of these may
 * be supported on any given implementation. Unsupported events will
 * be disabled at run-time based on the PMCEID registers.
 */
static const unsigned armv8_pmuv3_perf_map[PERF_COUNT_HW_MAX] = {
        PERF_MAP_ALL_UNSUPPORTED,
        [PERF_COUNT_HW_CPU_CYCLES]              = ARMV8_PMUV3_PERFCTR_CPU_CYCLES,
        [PERF_COUNT_HW_INSTRUCTIONS]            = ARMV8_PMUV3_PERFCTR_INST_RETIRED,
        [PERF_COUNT_HW_CACHE_REFERENCES]        = ARMV8_PMUV3_PERFCTR_L1D_CACHE,
        [PERF_COUNT_HW_CACHE_MISSES]            = ARMV8_PMUV3_PERFCTR_L1D_CACHE_REFILL,
        [PERF_COUNT_HW_BRANCH_INSTRUCTIONS]     = ARMV8_PMUV3_PERFCTR_PC_WRITE_RETIRED,
        [PERF_COUNT_HW_BRANCH_MISSES]           = ARMV8_PMUV3_PERFCTR_BR_MIS_PRED,
        [PERF_COUNT_HW_BUS_CYCLES]              = ARMV8_PMUV3_PERFCTR_BUS_CYCLES,
        [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = ARMV8_PMUV3_PERFCTR_STALL_FRONTEND,
        [PERF_COUNT_HW_STALLED_CYCLES_BACKEND]  = ARMV8_PMUV3_PERFCTR_STALL_BACKEND,
};

static const unsigned armv8_pmuv3_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
                                                [PERF_COUNT_HW_CACHE_OP_MAX]
                                                [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
        PERF_CACHE_MAP_ALL_UNSUPPORTED,

        [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)]  = ARMV8_PMUV3_PERFCTR_L1D_CACHE,
        [C(L1D)][C(OP_READ)][C(RESULT_MISS)]    = ARMV8_PMUV3_PERFCTR_L1D_CACHE_REFILL,

        [C(L1I)][C(OP_READ)][C(RESULT_ACCESS)]  = ARMV8_PMUV3_PERFCTR_L1I_CACHE,
        [C(L1I)][C(OP_READ)][C(RESULT_MISS)]    = ARMV8_PMUV3_PERFCTR_L1I_CACHE_REFILL,

        [C(DTLB)][C(OP_READ)][C(RESULT_MISS)]   = ARMV8_PMUV3_PERFCTR_L1D_TLB_REFILL,
        [C(DTLB)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_L1D_TLB,

        [C(ITLB)][C(OP_READ)][C(RESULT_MISS)]   = ARMV8_PMUV3_PERFCTR_L1I_TLB_REFILL,
        [C(ITLB)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_L1I_TLB,

        [C(LL)][C(OP_READ)][C(RESULT_MISS)]     = ARMV8_PMUV3_PERFCTR_LL_CACHE_MISS_RD,
        [C(LL)][C(OP_READ)][C(RESULT_ACCESS)]   = ARMV8_PMUV3_PERFCTR_LL_CACHE_RD,

        [C(BPU)][C(OP_READ)][C(RESULT_ACCESS)]  = ARMV8_PMUV3_PERFCTR_BR_PRED,
        [C(BPU)][C(OP_READ)][C(RESULT_MISS)]    = ARMV8_PMUV3_PERFCTR_BR_MIS_PRED,
};

static const unsigned armv8_a53_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
                                              [PERF_COUNT_HW_CACHE_OP_MAX]
                                              [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
        PERF_CACHE_MAP_ALL_UNSUPPORTED,

        [C(L1D)][C(OP_PREFETCH)][C(RESULT_MISS)] = ARMV8_A53_PERFCTR_PREF_LINEFILL,

        [C(NODE)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_RD,
        [C(NODE)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_WR,
};

static const unsigned armv8_a57_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
                                              [PERF_COUNT_HW_CACHE_OP_MAX]
                                              [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
        PERF_CACHE_MAP_ALL_UNSUPPORTED,

        [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)]  = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_RD,
        [C(L1D)][C(OP_READ)][C(RESULT_MISS)]    = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_RD,
        [C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WR,
        [C(L1D)][C(OP_WRITE)][C(RESULT_MISS)]   = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_WR,

        [C(DTLB)][C(OP_READ)][C(RESULT_MISS)]   = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_RD,
        [C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)]  = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_WR,

        [C(NODE)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_RD,
        [C(NODE)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_WR,
};

static const unsigned armv8_a73_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
                                              [PERF_COUNT_HW_CACHE_OP_MAX]
                                              [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
        PERF_CACHE_MAP_ALL_UNSUPPORTED,

        [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)]  = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_RD,
        [C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WR,
};

static const unsigned armv8_thunder_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
                                                   [PERF_COUNT_HW_CACHE_OP_MAX]
                                                   [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
        PERF_CACHE_MAP_ALL_UNSUPPORTED,

        [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)]  = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_RD,
        [C(L1D)][C(OP_READ)][C(RESULT_MISS)]    = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_RD,
        [C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WR,
        [C(L1D)][C(OP_WRITE)][C(RESULT_MISS)]   = ARMV8_THUNDER_PERFCTR_L1D_CACHE_MISS_ST,
        [C(L1D)][C(OP_PREFETCH)][C(RESULT_ACCESS)] = ARMV8_THUNDER_PERFCTR_L1D_CACHE_PREF_ACCESS,
        [C(L1D)][C(OP_PREFETCH)][C(RESULT_MISS)] = ARMV8_THUNDER_PERFCTR_L1D_CACHE_PREF_MISS,

        [C(L1I)][C(OP_PREFETCH)][C(RESULT_ACCESS)] = ARMV8_THUNDER_PERFCTR_L1I_CACHE_PREF_ACCESS,
        [C(L1I)][C(OP_PREFETCH)][C(RESULT_MISS)] = ARMV8_THUNDER_PERFCTR_L1I_CACHE_PREF_MISS,

        [C(DTLB)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_RD,
        [C(DTLB)][C(OP_READ)][C(RESULT_MISS)]   = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_RD,
        [C(DTLB)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_WR,
        [C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)]  = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_WR,
};

static const unsigned armv8_vulcan_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
                                              [PERF_COUNT_HW_CACHE_OP_MAX]
                                              [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
        PERF_CACHE_MAP_ALL_UNSUPPORTED,

        [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)]  = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_RD,
        [C(L1D)][C(OP_READ)][C(RESULT_MISS)]    = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_RD,
        [C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WR,
        [C(L1D)][C(OP_WRITE)][C(RESULT_MISS)]   = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_WR,

        [C(DTLB)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_RD,
        [C(DTLB)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_WR,
        [C(DTLB)][C(OP_READ)][C(RESULT_MISS)]   = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_RD,
        [C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)]  = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_WR,

        [C(NODE)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_RD,
        [C(NODE)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_WR,
};

static ssize_t
armv8pmu_events_sysfs_show(struct device *dev,
                           struct device_attribute *attr, char *page)
{
        struct perf_pmu_events_attr *pmu_attr;

        pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);

        return sprintf(page, "event=0x%04llx\n", pmu_attr->id);
}

#define ARMV8_EVENT_ATTR(name, config)                                          \
        (&((struct perf_pmu_events_attr) {                                      \
                .attr = __ATTR(name, 0444, armv8pmu_events_sysfs_show, NULL),   \
                .id = config,                                                   \
        }).attr.attr)

static struct attribute *armv8_pmuv3_event_attrs[] = {
        ARMV8_EVENT_ATTR(sw_incr, ARMV8_PMUV3_PERFCTR_SW_INCR),
        ARMV8_EVENT_ATTR(l1i_cache_refill, ARMV8_PMUV3_PERFCTR_L1I_CACHE_REFILL),
        ARMV8_EVENT_ATTR(l1i_tlb_refill, ARMV8_PMUV3_PERFCTR_L1I_TLB_REFILL),
        ARMV8_EVENT_ATTR(l1d_cache_refill, ARMV8_PMUV3_PERFCTR_L1D_CACHE_REFILL),
        ARMV8_EVENT_ATTR(l1d_cache, ARMV8_PMUV3_PERFCTR_L1D_CACHE),
        ARMV8_EVENT_ATTR(l1d_tlb_refill, ARMV8_PMUV3_PERFCTR_L1D_TLB_REFILL),
        ARMV8_EVENT_ATTR(ld_retired, ARMV8_PMUV3_PERFCTR_LD_RETIRED),
        ARMV8_EVENT_ATTR(st_retired, ARMV8_PMUV3_PERFCTR_ST_RETIRED),
        ARMV8_EVENT_ATTR(inst_retired, ARMV8_PMUV3_PERFCTR_INST_RETIRED),
        ARMV8_EVENT_ATTR(exc_taken, ARMV8_PMUV3_PERFCTR_EXC_TAKEN),
        ARMV8_EVENT_ATTR(exc_return, ARMV8_PMUV3_PERFCTR_EXC_RETURN),
        ARMV8_EVENT_ATTR(cid_write_retired, ARMV8_PMUV3_PERFCTR_CID_WRITE_RETIRED),
        ARMV8_EVENT_ATTR(pc_write_retired, ARMV8_PMUV3_PERFCTR_PC_WRITE_RETIRED),
        ARMV8_EVENT_ATTR(br_immed_retired, ARMV8_PMUV3_PERFCTR_BR_IMMED_RETIRED),
        ARMV8_EVENT_ATTR(br_return_retired, ARMV8_PMUV3_PERFCTR_BR_RETURN_RETIRED),
        ARMV8_EVENT_ATTR(unaligned_ldst_retired, ARMV8_PMUV3_PERFCTR_UNALIGNED_LDST_RETIRED),
        ARMV8_EVENT_ATTR(br_mis_pred, ARMV8_PMUV3_PERFCTR_BR_MIS_PRED),
        ARMV8_EVENT_ATTR(cpu_cycles, ARMV8_PMUV3_PERFCTR_CPU_CYCLES),
        ARMV8_EVENT_ATTR(br_pred, ARMV8_PMUV3_PERFCTR_BR_PRED),
        ARMV8_EVENT_ATTR(mem_access, ARMV8_PMUV3_PERFCTR_MEM_ACCESS),
        ARMV8_EVENT_ATTR(l1i_cache, ARMV8_PMUV3_PERFCTR_L1I_CACHE),
        ARMV8_EVENT_ATTR(l1d_cache_wb, ARMV8_PMUV3_PERFCTR_L1D_CACHE_WB),
        ARMV8_EVENT_ATTR(l2d_cache, ARMV8_PMUV3_PERFCTR_L2D_CACHE),
        ARMV8_EVENT_ATTR(l2d_cache_refill, ARMV8_PMUV3_PERFCTR_L2D_CACHE_REFILL),
        ARMV8_EVENT_ATTR(l2d_cache_wb, ARMV8_PMUV3_PERFCTR_L2D_CACHE_WB),
        ARMV8_EVENT_ATTR(bus_access, ARMV8_PMUV3_PERFCTR_BUS_ACCESS),
        ARMV8_EVENT_ATTR(memory_error, ARMV8_PMUV3_PERFCTR_MEMORY_ERROR),
        ARMV8_EVENT_ATTR(inst_spec, ARMV8_PMUV3_PERFCTR_INST_SPEC),
        ARMV8_EVENT_ATTR(ttbr_write_retired, ARMV8_PMUV3_PERFCTR_TTBR_WRITE_RETIRED),
        ARMV8_EVENT_ATTR(bus_cycles, ARMV8_PMUV3_PERFCTR_BUS_CYCLES),
        /* Don't expose the chain event in /sys, since it's useless in isolation */
        ARMV8_EVENT_ATTR(l1d_cache_allocate, ARMV8_PMUV3_PERFCTR_L1D_CACHE_ALLOCATE),
        ARMV8_EVENT_ATTR(l2d_cache_allocate, ARMV8_PMUV3_PERFCTR_L2D_CACHE_ALLOCATE),
        ARMV8_EVENT_ATTR(br_retired, ARMV8_PMUV3_PERFCTR_BR_RETIRED),
        ARMV8_EVENT_ATTR(br_mis_pred_retired, ARMV8_PMUV3_PERFCTR_BR_MIS_PRED_RETIRED),
        ARMV8_EVENT_ATTR(stall_frontend, ARMV8_PMUV3_PERFCTR_STALL_FRONTEND),
        ARMV8_EVENT_ATTR(stall_backend, ARMV8_PMUV3_PERFCTR_STALL_BACKEND),
        ARMV8_EVENT_ATTR(l1d_tlb, ARMV8_PMUV3_PERFCTR_L1D_TLB),
        ARMV8_EVENT_ATTR(l1i_tlb, ARMV8_PMUV3_PERFCTR_L1I_TLB),
        ARMV8_EVENT_ATTR(l2i_cache, ARMV8_PMUV3_PERFCTR_L2I_CACHE),
        ARMV8_EVENT_ATTR(l2i_cache_refill, ARMV8_PMUV3_PERFCTR_L2I_CACHE_REFILL),
        ARMV8_EVENT_ATTR(l3d_cache_allocate, ARMV8_PMUV3_PERFCTR_L3D_CACHE_ALLOCATE),
        ARMV8_EVENT_ATTR(l3d_cache_refill, ARMV8_PMUV3_PERFCTR_L3D_CACHE_REFILL),
        ARMV8_EVENT_ATTR(l3d_cache, ARMV8_PMUV3_PERFCTR_L3D_CACHE),
        ARMV8_EVENT_ATTR(l3d_cache_wb, ARMV8_PMUV3_PERFCTR_L3D_CACHE_WB),
        ARMV8_EVENT_ATTR(l2d_tlb_refill, ARMV8_PMUV3_PERFCTR_L2D_TLB_REFILL),
        ARMV8_EVENT_ATTR(l2i_tlb_refill, ARMV8_PMUV3_PERFCTR_L2I_TLB_REFILL),
        ARMV8_EVENT_ATTR(l2d_tlb, ARMV8_PMUV3_PERFCTR_L2D_TLB),
        ARMV8_EVENT_ATTR(l2i_tlb, ARMV8_PMUV3_PERFCTR_L2I_TLB),
        ARMV8_EVENT_ATTR(remote_access, ARMV8_PMUV3_PERFCTR_REMOTE_ACCESS),
        ARMV8_EVENT_ATTR(ll_cache, ARMV8_PMUV3_PERFCTR_LL_CACHE),
        ARMV8_EVENT_ATTR(ll_cache_miss, ARMV8_PMUV3_PERFCTR_LL_CACHE_MISS),
        ARMV8_EVENT_ATTR(dtlb_walk, ARMV8_PMUV3_PERFCTR_DTLB_WALK),
        ARMV8_EVENT_ATTR(itlb_walk, ARMV8_PMUV3_PERFCTR_ITLB_WALK),
        ARMV8_EVENT_ATTR(ll_cache_rd, ARMV8_PMUV3_PERFCTR_LL_CACHE_RD),
        ARMV8_EVENT_ATTR(ll_cache_miss_rd, ARMV8_PMUV3_PERFCTR_LL_CACHE_MISS_RD),
        ARMV8_EVENT_ATTR(remote_access_rd, ARMV8_PMUV3_PERFCTR_REMOTE_ACCESS_RD),
        ARMV8_EVENT_ATTR(l1d_cache_lmiss_rd, ARMV8_PMUV3_PERFCTR_L1D_CACHE_LMISS_RD),
        ARMV8_EVENT_ATTR(op_retired, ARMV8_PMUV3_PERFCTR_OP_RETIRED),
        ARMV8_EVENT_ATTR(op_spec, ARMV8_PMUV3_PERFCTR_OP_SPEC),
        ARMV8_EVENT_ATTR(stall, ARMV8_PMUV3_PERFCTR_STALL),
        ARMV8_EVENT_ATTR(stall_slot_backend, ARMV8_PMUV3_PERFCTR_STALL_SLOT_BACKEND),
        ARMV8_EVENT_ATTR(stall_slot_frontend, ARMV8_PMUV3_PERFCTR_STALL_SLOT_FRONTEND),
        ARMV8_EVENT_ATTR(stall_slot, ARMV8_PMUV3_PERFCTR_STALL_SLOT),
        ARMV8_EVENT_ATTR(sample_pop, ARMV8_SPE_PERFCTR_SAMPLE_POP),
        ARMV8_EVENT_ATTR(sample_feed, ARMV8_SPE_PERFCTR_SAMPLE_FEED),
        ARMV8_EVENT_ATTR(sample_filtrate, ARMV8_SPE_PERFCTR_SAMPLE_FILTRATE),
        ARMV8_EVENT_ATTR(sample_collision, ARMV8_SPE_PERFCTR_SAMPLE_COLLISION),
        ARMV8_EVENT_ATTR(cnt_cycles, ARMV8_AMU_PERFCTR_CNT_CYCLES),
        ARMV8_EVENT_ATTR(stall_backend_mem, ARMV8_AMU_PERFCTR_STALL_BACKEND_MEM),
        ARMV8_EVENT_ATTR(l1i_cache_lmiss, ARMV8_PMUV3_PERFCTR_L1I_CACHE_LMISS),
        ARMV8_EVENT_ATTR(l2d_cache_lmiss_rd, ARMV8_PMUV3_PERFCTR_L2D_CACHE_LMISS_RD),
        ARMV8_EVENT_ATTR(l2i_cache_lmiss, ARMV8_PMUV3_PERFCTR_L2I_CACHE_LMISS),
        ARMV8_EVENT_ATTR(l3d_cache_lmiss_rd, ARMV8_PMUV3_PERFCTR_L3D_CACHE_LMISS_RD),
        ARMV8_EVENT_ATTR(ldst_align_lat, ARMV8_PMUV3_PERFCTR_LDST_ALIGN_LAT),
        ARMV8_EVENT_ATTR(ld_align_lat, ARMV8_PMUV3_PERFCTR_LD_ALIGN_LAT),
        ARMV8_EVENT_ATTR(st_align_lat, ARMV8_PMUV3_PERFCTR_ST_ALIGN_LAT),
        ARMV8_EVENT_ATTR(mem_access_checked, ARMV8_MTE_PERFCTR_MEM_ACCESS_CHECKED),
        ARMV8_EVENT_ATTR(mem_access_checked_rd, ARMV8_MTE_PERFCTR_MEM_ACCESS_CHECKED_RD),
        ARMV8_EVENT_ATTR(mem_access_checked_wr, ARMV8_MTE_PERFCTR_MEM_ACCESS_CHECKED_WR),
        NULL,
};

static umode_t
armv8pmu_event_attr_is_visible(struct kobject *kobj,
                               struct attribute *attr, int unused)
{
        struct device *dev = kobj_to_dev(kobj);
        struct pmu *pmu = dev_get_drvdata(dev);
        struct arm_pmu *cpu_pmu = container_of(pmu, struct arm_pmu, pmu);
        struct perf_pmu_events_attr *pmu_attr;

        pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr.attr);

        if (pmu_attr->id < ARMV8_PMUV3_MAX_COMMON_EVENTS &&
            test_bit(pmu_attr->id, cpu_pmu->pmceid_bitmap))
                return attr->mode;

        if (pmu_attr->id >= ARMV8_PMUV3_EXT_COMMON_EVENT_BASE) {
                u64 id = pmu_attr->id - ARMV8_PMUV3_EXT_COMMON_EVENT_BASE;

                if (id < ARMV8_PMUV3_MAX_COMMON_EVENTS &&
                    test_bit(id, cpu_pmu->pmceid_ext_bitmap))
                        return attr->mode;
        }

        return 0;
}

static struct attribute_group armv8_pmuv3_events_attr_group = {
        .name = "events",
        .attrs = armv8_pmuv3_event_attrs,
        .is_visible = armv8pmu_event_attr_is_visible,
};

PMU_FORMAT_ATTR(event, "config:0-15");
PMU_FORMAT_ATTR(long, "config1:0");

static inline bool armv8pmu_event_is_64bit(struct perf_event *event)
{
        return event->attr.config1 & 0x1;
}

static struct attribute *armv8_pmuv3_format_attrs[] = {
        &format_attr_event.attr,
        &format_attr_long.attr,
        NULL,
};

static struct attribute_group armv8_pmuv3_format_attr_group = {
        .name = "format",
        .attrs = armv8_pmuv3_format_attrs,
};

static ssize_t slots_show(struct device *dev, struct device_attribute *attr,
                          char *page)
{
        struct pmu *pmu = dev_get_drvdata(dev);
        struct arm_pmu *cpu_pmu = container_of(pmu, struct arm_pmu, pmu);
        u32 slots = cpu_pmu->reg_pmmir & ARMV8_PMU_SLOTS_MASK;

        return snprintf(page, PAGE_SIZE, "0x%08x\n", slots);
}

static DEVICE_ATTR_RO(slots);

static struct attribute *armv8_pmuv3_caps_attrs[] = {
        &dev_attr_slots.attr,
        NULL,
};

static struct attribute_group armv8_pmuv3_caps_attr_group = {
        .name = "caps",
        .attrs = armv8_pmuv3_caps_attrs,
};

/*
 * Perf Events' indices
 */
#define ARMV8_IDX_CYCLE_COUNTER 0
#define ARMV8_IDX_COUNTER0      1


/*
 * We unconditionally enable ARMv8.5-PMU long event counter support
 * (64-bit events) where supported. Indicate if this arm_pmu has long
 * event counter support.
 */
static bool armv8pmu_has_long_event(struct arm_pmu *cpu_pmu)
{
        return (cpu_pmu->pmuver >= ID_AA64DFR0_PMUVER_8_5);
}

/*
 * We must chain two programmable counters for 64 bit events,
 * except when we have allocated the 64bit cycle counter (for CPU
 * cycles event). This must be called only when the event has
 * a counter allocated.
 */
static inline bool armv8pmu_event_is_chained(struct perf_event *event)
{
        int idx = event->hw.idx;
        struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);

        return !WARN_ON(idx < 0) &&
               armv8pmu_event_is_64bit(event) &&
               !armv8pmu_has_long_event(cpu_pmu) &&
               (idx != ARMV8_IDX_CYCLE_COUNTER);
}

/*
 * ARMv8 low level PMU access
 */

/*
 * Perf Event to low level counters mapping
 */
#define ARMV8_IDX_TO_COUNTER(x) \
        (((x) - ARMV8_IDX_COUNTER0) & ARMV8_PMU_COUNTER_MASK)

/*
 * This code is really good
 */

#define PMEVN_CASE(n, case_macro) \
        case n: case_macro(n); break

#define PMEVN_SWITCH(x, case_macro)                             \
        do {                                                    \
                switch (x) {                                    \
                PMEVN_CASE(0,  case_macro);                     \
                PMEVN_CASE(1,  case_macro);                     \
                PMEVN_CASE(2,  case_macro);                     \
                PMEVN_CASE(3,  case_macro);                     \
                PMEVN_CASE(4,  case_macro);                     \
                PMEVN_CASE(5,  case_macro);                     \
                PMEVN_CASE(6,  case_macro);                     \
                PMEVN_CASE(7,  case_macro);                     \
                PMEVN_CASE(8,  case_macro);                     \
                PMEVN_CASE(9,  case_macro);                     \
                PMEVN_CASE(10, case_macro);                     \
                PMEVN_CASE(11, case_macro);                     \
                PMEVN_CASE(12, case_macro);                     \
                PMEVN_CASE(13, case_macro);                     \
                PMEVN_CASE(14, case_macro);                     \
                PMEVN_CASE(15, case_macro);                     \
                PMEVN_CASE(16, case_macro);                     \
                PMEVN_CASE(17, case_macro);                     \
                PMEVN_CASE(18, case_macro);                     \
                PMEVN_CASE(19, case_macro);                     \
                PMEVN_CASE(20, case_macro);                     \
                PMEVN_CASE(21, case_macro);                     \
                PMEVN_CASE(22, case_macro);                     \
                PMEVN_CASE(23, case_macro);                     \
                PMEVN_CASE(24, case_macro);                     \
                PMEVN_CASE(25, case_macro);                     \
                PMEVN_CASE(26, case_macro);                     \
                PMEVN_CASE(27, case_macro);                     \
                PMEVN_CASE(28, case_macro);                     \
                PMEVN_CASE(29, case_macro);                     \
                PMEVN_CASE(30, case_macro);                     \
                default: WARN(1, "Invalid PMEV* index\n");      \
                }                                               \
        } while (0)

#define RETURN_READ_PMEVCNTRN(n) \
        return read_sysreg(pmevcntr##n##_el0)
static unsigned long read_pmevcntrn(int n)
{
        PMEVN_SWITCH(n, RETURN_READ_PMEVCNTRN);
        return 0;
}

#define WRITE_PMEVCNTRN(n) \
        write_sysreg(val, pmevcntr##n##_el0)
static void write_pmevcntrn(int n, unsigned long val)
{
        PMEVN_SWITCH(n, WRITE_PMEVCNTRN);
}

#define WRITE_PMEVTYPERN(n) \
        write_sysreg(val, pmevtyper##n##_el0)
static void write_pmevtypern(int n, unsigned long val)
{
        PMEVN_SWITCH(n, WRITE_PMEVTYPERN);
}

static inline u32 armv8pmu_pmcr_read(void)
{
        return read_sysreg(pmcr_el0);
}

static inline void armv8pmu_pmcr_write(u32 val)
{
        val &= ARMV8_PMU_PMCR_MASK;
        isb();
        write_sysreg(val, pmcr_el0);
}

static inline int armv8pmu_has_overflowed(u32 pmovsr)
{
        return pmovsr & ARMV8_PMU_OVERFLOWED_MASK;
}

static inline int armv8pmu_counter_has_overflowed(u32 pmnc, int idx)
{
        return pmnc & BIT(ARMV8_IDX_TO_COUNTER(idx));
}

static inline u32 armv8pmu_read_evcntr(int idx)
{
        u32 counter = ARMV8_IDX_TO_COUNTER(idx);

        return read_pmevcntrn(counter);
}

static inline u64 armv8pmu_read_hw_counter(struct perf_event *event)
{
        int idx = event->hw.idx;
        u64 val = 0;

        val = armv8pmu_read_evcntr(idx);
        if (armv8pmu_event_is_chained(event))
                val = (val << 32) | armv8pmu_read_evcntr(idx - 1);
        return val;
}

/*
 * The cycle counter is always a 64-bit counter. When ARMV8_PMU_PMCR_LP
 * is set the event counters also become 64-bit counters. Unless the
 * user has requested a long counter (attr.config1) then we want to
 * interrupt upon 32-bit overflow - we achieve this by applying a bias.
 */
static bool armv8pmu_event_needs_bias(struct perf_event *event)
{
        struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
        struct hw_perf_event *hwc = &event->hw;
        int idx = hwc->idx;

        if (armv8pmu_event_is_64bit(event))
                return false;

        if (armv8pmu_has_long_event(cpu_pmu) ||
            idx == ARMV8_IDX_CYCLE_COUNTER)
                return true;

        return false;
}

static u64 armv8pmu_bias_long_counter(struct perf_event *event, u64 value)
{
        if (armv8pmu_event_needs_bias(event))
                value |= GENMASK(63, 32);

        return value;
}

static u64 armv8pmu_unbias_long_counter(struct perf_event *event, u64 value)
{
        if (armv8pmu_event_needs_bias(event))
                value &= ~GENMASK(63, 32);

        return value;
}

static u64 armv8pmu_read_counter(struct perf_event *event)
{
        struct hw_perf_event *hwc = &event->hw;
        int idx = hwc->idx;
        u64 value = 0;

        if (idx == ARMV8_IDX_CYCLE_COUNTER)
                value = read_sysreg(pmccntr_el0);
        else
                value = armv8pmu_read_hw_counter(event);

        return  armv8pmu_unbias_long_counter(event, value);
}

static inline void armv8pmu_write_evcntr(int idx, u64 value)
{
        u32 counter = ARMV8_IDX_TO_COUNTER(idx);

        write_pmevcntrn(counter, value);
}

static inline void armv8pmu_write_hw_counter(struct perf_event *event,
                                             u64 value)
{
        int idx = event->hw.idx;

        if (armv8pmu_event_is_chained(event)) {
                armv8pmu_write_evcntr(idx, upper_32_bits(value));
                armv8pmu_write_evcntr(idx - 1, lower_32_bits(value));
        } else {
                armv8pmu_write_evcntr(idx, value);
        }
}

static void armv8pmu_write_counter(struct perf_event *event, u64 value)
{
        struct hw_perf_event *hwc = &event->hw;
        int idx = hwc->idx;

        value = armv8pmu_bias_long_counter(event, value);

        if (idx == ARMV8_IDX_CYCLE_COUNTER)
                write_sysreg(value, pmccntr_el0);
        else
                armv8pmu_write_hw_counter(event, value);
}

static inline void armv8pmu_write_evtype(int idx, u32 val)
{
        u32 counter = ARMV8_IDX_TO_COUNTER(idx);

        val &= ARMV8_PMU_EVTYPE_MASK;
        write_pmevtypern(counter, val);
}

static inline void armv8pmu_write_event_type(struct perf_event *event)
{
        struct hw_perf_event *hwc = &event->hw;
        int idx = hwc->idx;

        /*
         * For chained events, the low counter is programmed to count
         * the event of interest and the high counter is programmed
         * with CHAIN event code with filters set to count at all ELs.
         */
        if (armv8pmu_event_is_chained(event)) {
                u32 chain_evt = ARMV8_PMUV3_PERFCTR_CHAIN |
                                ARMV8_PMU_INCLUDE_EL2;

                armv8pmu_write_evtype(idx - 1, hwc->config_base);
                armv8pmu_write_evtype(idx, chain_evt);
        } else {
                if (idx == ARMV8_IDX_CYCLE_COUNTER)
                        write_sysreg(hwc->config_base, pmccfiltr_el0);
                else
                        armv8pmu_write_evtype(idx, hwc->config_base);
        }
}

static u32 armv8pmu_event_cnten_mask(struct perf_event *event)
{
        int counter = ARMV8_IDX_TO_COUNTER(event->hw.idx);
        u32 mask = BIT(counter);

        if (armv8pmu_event_is_chained(event))
                mask |= BIT(counter - 1);
        return mask;
}

static inline void armv8pmu_enable_counter(u32 mask)
{
        /*
         * Make sure event configuration register writes are visible before we
         * enable the counter.
         * */
        isb();
        write_sysreg(mask, pmcntenset_el0);
}

static inline void armv8pmu_enable_event_counter(struct perf_event *event)
{
        struct perf_event_attr *attr = &event->attr;
        u32 mask = armv8pmu_event_cnten_mask(event);

        kvm_set_pmu_events(mask, attr);

        /* We rely on the hypervisor switch code to enable guest counters */
        if (!kvm_pmu_counter_deferred(attr))
                armv8pmu_enable_counter(mask);
}

static inline void armv8pmu_disable_counter(u32 mask)
{
        write_sysreg(mask, pmcntenclr_el0);
        /*
         * Make sure the effects of disabling the counter are visible before we
         * start configuring the event.
         */
        isb();
}

static inline void armv8pmu_disable_event_counter(struct perf_event *event)
{
        struct perf_event_attr *attr = &event->attr;
        u32 mask = armv8pmu_event_cnten_mask(event);

        kvm_clr_pmu_events(mask);

        /* We rely on the hypervisor switch code to disable guest counters */
        if (!kvm_pmu_counter_deferred(attr))
                armv8pmu_disable_counter(mask);
}

static inline void armv8pmu_enable_intens(u32 mask)
{
        write_sysreg(mask, pmintenset_el1);
}

static inline void armv8pmu_enable_event_irq(struct perf_event *event)
{
        u32 counter = ARMV8_IDX_TO_COUNTER(event->hw.idx);
        armv8pmu_enable_intens(BIT(counter));
}

static inline void armv8pmu_disable_intens(u32 mask)
{
        write_sysreg(mask, pmintenclr_el1);
        isb();
        /* Clear the overflow flag in case an interrupt is pending. */
        write_sysreg(mask, pmovsclr_el0);
        isb();
}

static inline void armv8pmu_disable_event_irq(struct perf_event *event)
{
        u32 counter = ARMV8_IDX_TO_COUNTER(event->hw.idx);
        armv8pmu_disable_intens(BIT(counter));
}

static inline u32 armv8pmu_getreset_flags(void)
{
        u32 value;

        /* Read */
        value = read_sysreg(pmovsclr_el0);

        /* Write to clear flags */
        value &= ARMV8_PMU_OVSR_MASK;
        write_sysreg(value, pmovsclr_el0);

        return value;
}

static void armv8pmu_enable_event(struct perf_event *event)
{
        /*
         * Enable counter and interrupt, and set the counter to count
         * the event that we're interested in.
         */

        /*
         * Disable counter
         */
        armv8pmu_disable_event_counter(event);

        /*
         * Set event.
         */
        armv8pmu_write_event_type(event);

        /*
         * Enable interrupt for this counter
         */
        armv8pmu_enable_event_irq(event);

        /*
         * Enable counter
         */
        armv8pmu_enable_event_counter(event);
}

static void armv8pmu_disable_event(struct perf_event *event)
{
        /*
         * Disable counter
         */
        armv8pmu_disable_event_counter(event);

        /*
         * Disable interrupt for this counter
         */
        armv8pmu_disable_event_irq(event);
}

static void armv8pmu_start(struct arm_pmu *cpu_pmu)
{
        /* Enable all counters */
        armv8pmu_pmcr_write(armv8pmu_pmcr_read() | ARMV8_PMU_PMCR_E);
}

static void armv8pmu_stop(struct arm_pmu *cpu_pmu)
{
        /* Disable all counters */
        armv8pmu_pmcr_write(armv8pmu_pmcr_read() & ~ARMV8_PMU_PMCR_E);
}

static irqreturn_t armv8pmu_handle_irq(struct arm_pmu *cpu_pmu)
{
        u32 pmovsr;
        struct perf_sample_data data;
        struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events);
        struct pt_regs *regs;
        int idx;

        /*
         * Get and reset the IRQ flags
         */
        pmovsr = armv8pmu_getreset_flags();

        /*
         * Did an overflow occur?
         */
        if (!armv8pmu_has_overflowed(pmovsr))
                return IRQ_NONE;

        /*
         * Handle the counter(s) overflow(s)
         */
        regs = get_irq_regs();

        /*
         * Stop the PMU while processing the counter overflows
         * to prevent skews in group events.
         */
        armv8pmu_stop(cpu_pmu);
        for (idx = 0; idx < cpu_pmu->num_events; ++idx) {
                struct perf_event *event = cpuc->events[idx];
                struct hw_perf_event *hwc;

                /* Ignore if we don't have an event. */
                if (!event)
                        continue;

                /*
                 * We have a single interrupt for all counters. Check that
                 * each counter has overflowed before we process it.
                 */
                if (!armv8pmu_counter_has_overflowed(pmovsr, idx))
                        continue;

                hwc = &event->hw;
                armpmu_event_update(event);
                perf_sample_data_init(&data, 0, hwc->last_period);
                if (!armpmu_event_set_period(event))
                        continue;

                /*
                 * Perf event overflow will queue the processing of the event as
                 * an irq_work which will be taken care of in the handling of
                 * IPI_IRQ_WORK.
                 */
                if (perf_event_overflow(event, &data, regs))
                        cpu_pmu->disable(event);
        }
        armv8pmu_start(cpu_pmu);

        return IRQ_HANDLED;
}

static int armv8pmu_get_single_idx(struct pmu_hw_events *cpuc,
                                    struct arm_pmu *cpu_pmu)
{
        int idx;

        for (idx = ARMV8_IDX_COUNTER0; idx < cpu_pmu->num_events; idx ++) {
                if (!test_and_set_bit(idx, cpuc->used_mask))
                        return idx;
        }
        return -EAGAIN;
}

static int armv8pmu_get_chain_idx(struct pmu_hw_events *cpuc,
                                   struct arm_pmu *cpu_pmu)
{
        int idx;

        /*
         * Chaining requires two consecutive event counters, where
         * the lower idx must be even.
         */
        for (idx = ARMV8_IDX_COUNTER0 + 1; idx < cpu_pmu->num_events; idx += 2) {
                if (!test_and_set_bit(idx, cpuc->used_mask)) {
                        /* Check if the preceding even counter is available */
                        if (!test_and_set_bit(idx - 1, cpuc->used_mask))
                                return idx;
                        /* Release the Odd counter */
                        clear_bit(idx, cpuc->used_mask);
                }
        }
        return -EAGAIN;
}

static int armv8pmu_get_event_idx(struct pmu_hw_events *cpuc,
                                  struct perf_event *event)
{
        struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
        struct hw_perf_event *hwc = &event->hw;
        unsigned long evtype = hwc->config_base & ARMV8_PMU_EVTYPE_EVENT;

        /* Always prefer to place a cycle counter into the cycle counter. */
        if (evtype == ARMV8_PMUV3_PERFCTR_CPU_CYCLES) {
                if (!test_and_set_bit(ARMV8_IDX_CYCLE_COUNTER, cpuc->used_mask))
                        return ARMV8_IDX_CYCLE_COUNTER;
        }

        /*
         * Otherwise use events counters
         */
        if (armv8pmu_event_is_64bit(event) &&
            !armv8pmu_has_long_event(cpu_pmu))
                return  armv8pmu_get_chain_idx(cpuc, cpu_pmu);
        else
                return armv8pmu_get_single_idx(cpuc, cpu_pmu);
}

static void armv8pmu_clear_event_idx(struct pmu_hw_events *cpuc,
                                     struct perf_event *event)
{
        int idx = event->hw.idx;

        clear_bit(idx, cpuc->used_mask);
        if (armv8pmu_event_is_chained(event))
                clear_bit(idx - 1, cpuc->used_mask);
}

/*
 * Add an event filter to a given event.
 */
static int armv8pmu_set_event_filter(struct hw_perf_event *event,
                                     struct perf_event_attr *attr)
{
        unsigned long config_base = 0;

        if (attr->exclude_idle)
                return -EPERM;

        /*
         * If we're running in hyp mode, then we *are* the hypervisor.
         * Therefore we ignore exclude_hv in this configuration, since
         * there's no hypervisor to sample anyway. This is consistent
         * with other architectures (x86 and Power).
         */
        if (is_kernel_in_hyp_mode()) {
                if (!attr->exclude_kernel && !attr->exclude_host)
                        config_base |= ARMV8_PMU_INCLUDE_EL2;
                if (attr->exclude_guest)
                        config_base |= ARMV8_PMU_EXCLUDE_EL1;
                if (attr->exclude_host)
                        config_base |= ARMV8_PMU_EXCLUDE_EL0;
        } else {
                if (!attr->exclude_hv && !attr->exclude_host)
                        config_base |= ARMV8_PMU_INCLUDE_EL2;
        }

        /*
         * Filter out !VHE kernels and guest kernels
         */
        if (attr->exclude_kernel)
                config_base |= ARMV8_PMU_EXCLUDE_EL1;

        if (attr->exclude_user)
                config_base |= ARMV8_PMU_EXCLUDE_EL0;

        /*
         * Install the filter into config_base as this is used to
         * construct the event type.
         */
        event->config_base = config_base;

        return 0;
}

static int armv8pmu_filter_match(struct perf_event *event)
{
        unsigned long evtype = event->hw.config_base & ARMV8_PMU_EVTYPE_EVENT;
        return evtype != ARMV8_PMUV3_PERFCTR_CHAIN;
}

static void armv8pmu_reset(void *info)
{
        struct arm_pmu *cpu_pmu = (struct arm_pmu *)info;
        u32 pmcr;

        /* The counter and interrupt enable registers are unknown at reset. */
        armv8pmu_disable_counter(U32_MAX);
        armv8pmu_disable_intens(U32_MAX);

        /* Clear the counters we flip at guest entry/exit */
        kvm_clr_pmu_events(U32_MAX);

        /*
         * Initialize & Reset PMNC. Request overflow interrupt for
         * 64 bit cycle counter but cheat in armv8pmu_write_counter().
         */
        pmcr = ARMV8_PMU_PMCR_P | ARMV8_PMU_PMCR_C | ARMV8_PMU_PMCR_LC;

        /* Enable long event counter support where available */
        if (armv8pmu_has_long_event(cpu_pmu))
                pmcr |= ARMV8_PMU_PMCR_LP;

        armv8pmu_pmcr_write(pmcr);
}

static int __armv8_pmuv3_map_event(struct perf_event *event,
                                   const unsigned (*extra_event_map)
                                                  [PERF_COUNT_HW_MAX],
                                   const unsigned (*extra_cache_map)
                                                  [PERF_COUNT_HW_CACHE_MAX]
                                                  [PERF_COUNT_HW_CACHE_OP_MAX]
                                                  [PERF_COUNT_HW_CACHE_RESULT_MAX])
{
        int hw_event_id;
        struct arm_pmu *armpmu = to_arm_pmu(event->pmu);

        hw_event_id = armpmu_map_event(event, &armv8_pmuv3_perf_map,
                                       &armv8_pmuv3_perf_cache_map,
                                       ARMV8_PMU_EVTYPE_EVENT);

        if (armv8pmu_event_is_64bit(event))
                event->hw.flags |= ARMPMU_EVT_64BIT;

        /* Only expose micro/arch events supported by this PMU */
        if ((hw_event_id > 0) && (hw_event_id < ARMV8_PMUV3_MAX_COMMON_EVENTS)
            && test_bit(hw_event_id, armpmu->pmceid_bitmap)) {
                return hw_event_id;
        }

        return armpmu_map_event(event, extra_event_map, extra_cache_map,
                                ARMV8_PMU_EVTYPE_EVENT);
}

static int armv8_pmuv3_map_event(struct perf_event *event)
{
        return __armv8_pmuv3_map_event(event, NULL, NULL);
}

static int armv8_a53_map_event(struct perf_event *event)
{
        return __armv8_pmuv3_map_event(event, NULL, &armv8_a53_perf_cache_map);
}

static int armv8_a57_map_event(struct perf_event *event)
{
        return __armv8_pmuv3_map_event(event, NULL, &armv8_a57_perf_cache_map);
}

static int armv8_a73_map_event(struct perf_event *event)
{
        return __armv8_pmuv3_map_event(event, NULL, &armv8_a73_perf_cache_map);
}

static int armv8_thunder_map_event(struct perf_event *event)
{
        return __armv8_pmuv3_map_event(event, NULL,
                                       &armv8_thunder_perf_cache_map);
}

static int armv8_vulcan_map_event(struct perf_event *event)
{
        return __armv8_pmuv3_map_event(event, NULL,
                                       &armv8_vulcan_perf_cache_map);
}

struct armv8pmu_probe_info {
        struct arm_pmu *pmu;
        bool present;
};

static void __armv8pmu_probe_pmu(void *info)
{
        struct armv8pmu_probe_info *probe = info;
        struct arm_pmu *cpu_pmu = probe->pmu;
        u64 dfr0;
        u64 pmceid_raw[2];
        u32 pmceid[2];
        int pmuver;

        dfr0 = read_sysreg(id_aa64dfr0_el1);
        pmuver = cpuid_feature_extract_unsigned_field(dfr0,
                        ID_AA64DFR0_PMUVER_SHIFT);
        if (pmuver == 0xf || pmuver == 0)
                return;

        cpu_pmu->pmuver = pmuver;
        probe->present = true;

        /* Read the nb of CNTx counters supported from PMNC */
        cpu_pmu->num_events = (armv8pmu_pmcr_read() >> ARMV8_PMU_PMCR_N_SHIFT)
                & ARMV8_PMU_PMCR_N_MASK;

        /* Add the CPU cycles counter */
        cpu_pmu->num_events += 1;

        pmceid[0] = pmceid_raw[0] = read_sysreg(pmceid0_el0);
        pmceid[1] = pmceid_raw[1] = read_sysreg(pmceid1_el0);

        bitmap_from_arr32(cpu_pmu->pmceid_bitmap,
                             pmceid, ARMV8_PMUV3_MAX_COMMON_EVENTS);

        pmceid[0] = pmceid_raw[0] >> 32;
        pmceid[1] = pmceid_raw[1] >> 32;

        bitmap_from_arr32(cpu_pmu->pmceid_ext_bitmap,
                             pmceid, ARMV8_PMUV3_MAX_COMMON_EVENTS);

        /* store PMMIR_EL1 register for sysfs */
        if (pmuver >= ID_AA64DFR0_PMUVER_8_4 && (pmceid_raw[1] & BIT(31)))
                cpu_pmu->reg_pmmir = read_cpuid(PMMIR_EL1);
        else
                cpu_pmu->reg_pmmir = 0;
}

static int armv8pmu_probe_pmu(struct arm_pmu *cpu_pmu)
{
        struct armv8pmu_probe_info probe = {
                .pmu = cpu_pmu,
                .present = false,
        };
        int ret;

        ret = smp_call_function_any(&cpu_pmu->supported_cpus,
                                    __armv8pmu_probe_pmu,
                                    &probe, 1);
        if (ret)
                return ret;

        return probe.present ? 0 : -ENODEV;
}

static int armv8_pmu_init(struct arm_pmu *cpu_pmu, char *name,
                          int (*map_event)(struct perf_event *event),
                          const struct attribute_group *events,
                          const struct attribute_group *format,
                          const struct attribute_group *caps)
{
        int ret = armv8pmu_probe_pmu(cpu_pmu);
        if (ret)
                return ret;

        cpu_pmu->handle_irq             = armv8pmu_handle_irq;
        cpu_pmu->enable                 = armv8pmu_enable_event;
        cpu_pmu->disable                = armv8pmu_disable_event;
        cpu_pmu->read_counter           = armv8pmu_read_counter;
        cpu_pmu->write_counter          = armv8pmu_write_counter;
        cpu_pmu->get_event_idx          = armv8pmu_get_event_idx;
        cpu_pmu->clear_event_idx        = armv8pmu_clear_event_idx;
        cpu_pmu->start                  = armv8pmu_start;
        cpu_pmu->stop                   = armv8pmu_stop;
        cpu_pmu->reset                  = armv8pmu_reset;
        cpu_pmu->set_event_filter       = armv8pmu_set_event_filter;
        cpu_pmu->filter_match           = armv8pmu_filter_match;

        cpu_pmu->name                   = name;
        cpu_pmu->map_event              = map_event;
        cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_EVENTS] = events ?
                        events : &armv8_pmuv3_events_attr_group;
        cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_FORMATS] = format ?
                        format : &armv8_pmuv3_format_attr_group;
        cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_CAPS] = caps ?
                        caps : &armv8_pmuv3_caps_attr_group;

        return 0;
}

static int armv8_pmu_init_nogroups(struct arm_pmu *cpu_pmu, char *name,
                                   int (*map_event)(struct perf_event *event))
{
        return armv8_pmu_init(cpu_pmu, name, map_event, NULL, NULL, NULL);
}

static int armv8_pmuv3_init(struct arm_pmu *cpu_pmu)
{
        return armv8_pmu_init_nogroups(cpu_pmu, "armv8_pmuv3",
                                       armv8_pmuv3_map_event);
}

static int armv8_a34_pmu_init(struct arm_pmu *cpu_pmu)
{
        return armv8_pmu_init_nogroups(cpu_pmu, "armv8_cortex_a34",
                                       armv8_pmuv3_map_event);
}

static int armv8_a35_pmu_init(struct arm_pmu *cpu_pmu)
{
        return armv8_pmu_init_nogroups(cpu_pmu, "armv8_cortex_a35",
                                       armv8_a53_map_event);
}

static int armv8_a53_pmu_init(struct arm_pmu *cpu_pmu)
{
        return armv8_pmu_init_nogroups(cpu_pmu, "armv8_cortex_a53",
                                       armv8_a53_map_event);
}

static int armv8_a55_pmu_init(struct arm_pmu *cpu_pmu)
{
        return armv8_pmu_init_nogroups(cpu_pmu, "armv8_cortex_a55",
                                       armv8_pmuv3_map_event);
}

static int armv8_a57_pmu_init(struct arm_pmu *cpu_pmu)
{
        return armv8_pmu_init_nogroups(cpu_pmu, "armv8_cortex_a57",
                                       armv8_a57_map_event);
}

static int armv8_a65_pmu_init(struct arm_pmu *cpu_pmu)
{
        return armv8_pmu_init_nogroups(cpu_pmu, "armv8_cortex_a65",
                                       armv8_pmuv3_map_event);
}

static int armv8_a72_pmu_init(struct arm_pmu *cpu_pmu)
{
        return armv8_pmu_init_nogroups(cpu_pmu, "armv8_cortex_a72",
                                       armv8_a57_map_event);
}

static int armv8_a73_pmu_init(struct arm_pmu *cpu_pmu)
{
        return armv8_pmu_init_nogroups(cpu_pmu, "armv8_cortex_a73",
                                       armv8_a73_map_event);
}

static int armv8_a75_pmu_init(struct arm_pmu *cpu_pmu)
{
        return armv8_pmu_init_nogroups(cpu_pmu, "armv8_cortex_a75",
                                       armv8_pmuv3_map_event);
}

static int armv8_a76_pmu_init(struct arm_pmu *cpu_pmu)
{
        return armv8_pmu_init_nogroups(cpu_pmu, "armv8_cortex_a76",
                                       armv8_pmuv3_map_event);
}

static int armv8_a77_pmu_init(struct arm_pmu *cpu_pmu)
{
        return armv8_pmu_init_nogroups(cpu_pmu, "armv8_cortex_a77",
                                       armv8_pmuv3_map_event);
}

static int armv8_e1_pmu_init(struct arm_pmu *cpu_pmu)
{
        return armv8_pmu_init_nogroups(cpu_pmu, "armv8_neoverse_e1",
                                       armv8_pmuv3_map_event);
}

static int armv8_n1_pmu_init(struct arm_pmu *cpu_pmu)
{
        return armv8_pmu_init_nogroups(cpu_pmu, "armv8_neoverse_n1",
                                       armv8_pmuv3_map_event);
}

static int armv8_thunder_pmu_init(struct arm_pmu *cpu_pmu)
{
        return armv8_pmu_init_nogroups(cpu_pmu, "armv8_cavium_thunder",
                                       armv8_thunder_map_event);
}

static int armv8_vulcan_pmu_init(struct arm_pmu *cpu_pmu)
{
        return armv8_pmu_init_nogroups(cpu_pmu, "armv8_brcm_vulcan",
                                       armv8_vulcan_map_event);
}

static const struct of_device_id armv8_pmu_of_device_ids[] = {
        {.compatible = "arm,armv8-pmuv3",       .data = armv8_pmuv3_init},
        {.compatible = "arm,cortex-a34-pmu",    .data = armv8_a34_pmu_init},
        {.compatible = "arm,cortex-a35-pmu",    .data = armv8_a35_pmu_init},
        {.compatible = "arm,cortex-a53-pmu",    .data = armv8_a53_pmu_init},
        {.compatible = "arm,cortex-a55-pmu",    .data = armv8_a55_pmu_init},
        {.compatible = "arm,cortex-a57-pmu",    .data = armv8_a57_pmu_init},
        {.compatible = "arm,cortex-a65-pmu",    .data = armv8_a65_pmu_init},
        {.compatible = "arm,cortex-a72-pmu",    .data = armv8_a72_pmu_init},
        {.compatible = "arm,cortex-a73-pmu",    .data = armv8_a73_pmu_init},
        {.compatible = "arm,cortex-a75-pmu",    .data = armv8_a75_pmu_init},
        {.compatible = "arm,cortex-a76-pmu",    .data = armv8_a76_pmu_init},
        {.compatible = "arm,cortex-a77-pmu",    .data = armv8_a77_pmu_init},
        {.compatible = "arm,neoverse-e1-pmu",   .data = armv8_e1_pmu_init},
        {.compatible = "arm,neoverse-n1-pmu",   .data = armv8_n1_pmu_init},
        {.compatible = "cavium,thunder-pmu",    .data = armv8_thunder_pmu_init},
        {.compatible = "brcm,vulcan-pmu",       .data = armv8_vulcan_pmu_init},
        {},
};

static int armv8_pmu_device_probe(struct platform_device *pdev)
{
        return arm_pmu_device_probe(pdev, armv8_pmu_of_device_ids, NULL);
}

static struct platform_driver armv8_pmu_driver = {
        .driver         = {
                .name   = ARMV8_PMU_PDEV_NAME,
                .of_match_table = armv8_pmu_of_device_ids,
                .suppress_bind_attrs = true,
        },
        .probe          = armv8_pmu_device_probe,
};

static int __init armv8_pmu_driver_init(void)
{
        int ret;

        if (acpi_disabled)
                ret = platform_driver_register(&armv8_pmu_driver);
        else
                ret = arm_pmu_acpi_probe(armv8_pmuv3_init);

        /*
         * Try to re-initialize lockup detector after PMU init in
         * case PMU events are triggered via NMIs.
         */
        if (ret == 0 && arm_pmu_irq_is_nmi())
                lockup_detector_init();

        return ret;
}
device_initcall(armv8_pmu_driver_init)

void arch_perf_update_userpage(struct perf_event *event,
                               struct perf_event_mmap_page *userpg, u64 now)
{
        struct clock_read_data *rd;
        unsigned int seq;
        u64 ns;

        userpg->cap_user_time = 0;
        userpg->cap_user_time_zero = 0;
        userpg->cap_user_time_short = 0;

        do {
                rd = sched_clock_read_begin(&seq);

                if (rd->read_sched_clock != arch_timer_read_counter)
                        return;

                userpg->time_mult = rd->mult;
                userpg->time_shift = rd->shift;
                userpg->time_zero = rd->epoch_ns;
                userpg->time_cycles = rd->epoch_cyc;
                userpg->time_mask = rd->sched_clock_mask;

                /*
                 * Subtract the cycle base, such that software that
                 * doesn't know about cap_user_time_short still 'works'
                 * assuming no wraps.
                 */
                ns = mul_u64_u32_shr(rd->epoch_cyc, rd->mult, rd->shift);
                userpg->time_zero -= ns;

        } while (sched_clock_read_retry(seq));

        userpg->time_offset = userpg->time_zero - now;

        /*
         * time_shift is not expected to be greater than 31 due to
         * the original published conversion algorithm shifting a
         * 32-bit value (now specifies a 64-bit value) - refer
         * perf_event_mmap_page documentation in perf_event.h.
         */
        if (userpg->time_shift == 32) {
                userpg->time_shift = 31;
                userpg->time_mult >>= 1;
        }

        /*
         * Internal timekeeping for enabled/running/stopped times
         * is always computed with the sched_clock.
         */
        userpg->cap_user_time = 1;
        userpg->cap_user_time_zero = 1;
        userpg->cap_user_time_short = 1;
}

#ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF
/*
 * Safe maximum CPU frequency in case a particular platform doesn't implement
 * cpufreq driver. Although, architecture doesn't put any restrictions on
 * maximum frequency but 5 GHz seems to be safe maximum given the available
 * Arm CPUs in the market which are clocked much less than 5 GHz. On the other
 * hand, we can't make it much higher as it would lead to a large hard-lockup
 * detection timeout on parts which are running slower (eg. 1GHz on
 * Developerbox) and doesn't possess a cpufreq driver.
 */
#define SAFE_MAX_CPU_FREQ       5000000000UL // 5 GHz
u64 hw_nmi_get_sample_period(int watchdog_thresh)
{
        unsigned int cpu = smp_processor_id();
        unsigned long max_cpu_freq;

        max_cpu_freq = cpufreq_get_hw_max_freq(cpu) * 1000UL;
        if (!max_cpu_freq)
                max_cpu_freq = SAFE_MAX_CPU_FREQ;

        return (u64)max_cpu_freq * watchdog_thresh;
}
#endif