![Mark Salter](/assets/img/avatar_default.png)
Recent arm64 builds using CONFIG_ARM64_64K_PAGES are failing with: arch/arm64/kernel/perf_regs.c: In function ‘perf_reg_abi’: arch/arm64/kernel/perf_regs.c:41:2: error: implicit declaration of function ‘is_compat_thread’ arch/arm64/kernel/perf_event.c:1398:2: error: unknown type name ‘compat_uptr_t’ This is due to some recent arm64 perf commits with compat support: commit23c7d70d55
: ARM64: perf: add support for frame pointer unwinding in compat mode commit2ee0d7fd36
: ARM64: perf: add support for perf registers API Those patches make the arm64 kernel unbuildable if CONFIG_COMPAT is not defined and CONFIG_ARM64_64K_PAGES depends on !CONFIG_COMPAT. This patch allows the arm64 kernel to build with and without CONFIG_COMPAT. Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
1524 lines
37 KiB
C
1524 lines
37 KiB
C
/*
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* PMU support
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*
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* Copyright (C) 2012 ARM Limited
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* Author: Will Deacon <will.deacon@arm.com>
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*
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* This code is based heavily on the ARMv7 perf event code.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define pr_fmt(fmt) "hw perfevents: " fmt
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#include <linux/bitmap.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/perf_event.h>
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#include <linux/platform_device.h>
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#include <linux/spinlock.h>
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#include <linux/uaccess.h>
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#include <asm/cputype.h>
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#include <asm/irq.h>
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#include <asm/irq_regs.h>
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#include <asm/pmu.h>
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#include <asm/stacktrace.h>
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/*
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* ARMv8 supports a maximum of 32 events.
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* The cycle counter is included in this total.
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*/
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#define ARMPMU_MAX_HWEVENTS 32
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static DEFINE_PER_CPU(struct perf_event * [ARMPMU_MAX_HWEVENTS], hw_events);
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static DEFINE_PER_CPU(unsigned long [BITS_TO_LONGS(ARMPMU_MAX_HWEVENTS)], used_mask);
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static DEFINE_PER_CPU(struct pmu_hw_events, cpu_hw_events);
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#define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu))
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/* Set at runtime when we know what CPU type we are. */
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static struct arm_pmu *cpu_pmu;
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int
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armpmu_get_max_events(void)
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{
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int max_events = 0;
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if (cpu_pmu != NULL)
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max_events = cpu_pmu->num_events;
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return max_events;
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}
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EXPORT_SYMBOL_GPL(armpmu_get_max_events);
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int perf_num_counters(void)
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{
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return armpmu_get_max_events();
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}
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EXPORT_SYMBOL_GPL(perf_num_counters);
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#define HW_OP_UNSUPPORTED 0xFFFF
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#define C(_x) \
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PERF_COUNT_HW_CACHE_##_x
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#define CACHE_OP_UNSUPPORTED 0xFFFF
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static int
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armpmu_map_cache_event(const unsigned (*cache_map)
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[PERF_COUNT_HW_CACHE_MAX]
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[PERF_COUNT_HW_CACHE_OP_MAX]
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[PERF_COUNT_HW_CACHE_RESULT_MAX],
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u64 config)
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{
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unsigned int cache_type, cache_op, cache_result, ret;
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cache_type = (config >> 0) & 0xff;
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if (cache_type >= PERF_COUNT_HW_CACHE_MAX)
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return -EINVAL;
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cache_op = (config >> 8) & 0xff;
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if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX)
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return -EINVAL;
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cache_result = (config >> 16) & 0xff;
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if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
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return -EINVAL;
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ret = (int)(*cache_map)[cache_type][cache_op][cache_result];
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if (ret == CACHE_OP_UNSUPPORTED)
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return -ENOENT;
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return ret;
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}
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static int
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armpmu_map_event(const unsigned (*event_map)[PERF_COUNT_HW_MAX], u64 config)
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{
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int mapping;
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if (config >= PERF_COUNT_HW_MAX)
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return -EINVAL;
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mapping = (*event_map)[config];
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return mapping == HW_OP_UNSUPPORTED ? -ENOENT : mapping;
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}
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static int
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armpmu_map_raw_event(u32 raw_event_mask, u64 config)
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{
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return (int)(config & raw_event_mask);
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}
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static int map_cpu_event(struct perf_event *event,
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const unsigned (*event_map)[PERF_COUNT_HW_MAX],
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const unsigned (*cache_map)
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[PERF_COUNT_HW_CACHE_MAX]
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[PERF_COUNT_HW_CACHE_OP_MAX]
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[PERF_COUNT_HW_CACHE_RESULT_MAX],
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u32 raw_event_mask)
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{
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u64 config = event->attr.config;
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switch (event->attr.type) {
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case PERF_TYPE_HARDWARE:
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return armpmu_map_event(event_map, config);
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case PERF_TYPE_HW_CACHE:
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return armpmu_map_cache_event(cache_map, config);
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case PERF_TYPE_RAW:
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return armpmu_map_raw_event(raw_event_mask, config);
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}
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return -ENOENT;
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}
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int
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armpmu_event_set_period(struct perf_event *event,
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struct hw_perf_event *hwc,
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int idx)
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{
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struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
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s64 left = local64_read(&hwc->period_left);
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s64 period = hwc->sample_period;
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int ret = 0;
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if (unlikely(left <= -period)) {
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left = period;
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local64_set(&hwc->period_left, left);
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hwc->last_period = period;
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ret = 1;
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}
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if (unlikely(left <= 0)) {
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left += period;
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local64_set(&hwc->period_left, left);
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hwc->last_period = period;
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ret = 1;
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}
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if (left > (s64)armpmu->max_period)
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left = armpmu->max_period;
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local64_set(&hwc->prev_count, (u64)-left);
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armpmu->write_counter(idx, (u64)(-left) & 0xffffffff);
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perf_event_update_userpage(event);
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return ret;
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}
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u64
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armpmu_event_update(struct perf_event *event,
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struct hw_perf_event *hwc,
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int idx)
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{
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struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
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u64 delta, prev_raw_count, new_raw_count;
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again:
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prev_raw_count = local64_read(&hwc->prev_count);
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new_raw_count = armpmu->read_counter(idx);
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if (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
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new_raw_count) != prev_raw_count)
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goto again;
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delta = (new_raw_count - prev_raw_count) & armpmu->max_period;
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local64_add(delta, &event->count);
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local64_sub(delta, &hwc->period_left);
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return new_raw_count;
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}
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static void
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armpmu_read(struct perf_event *event)
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{
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struct hw_perf_event *hwc = &event->hw;
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/* Don't read disabled counters! */
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if (hwc->idx < 0)
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return;
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armpmu_event_update(event, hwc, hwc->idx);
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}
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static void
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armpmu_stop(struct perf_event *event, int flags)
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{
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struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
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struct hw_perf_event *hwc = &event->hw;
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/*
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* ARM pmu always has to update the counter, so ignore
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* PERF_EF_UPDATE, see comments in armpmu_start().
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*/
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if (!(hwc->state & PERF_HES_STOPPED)) {
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armpmu->disable(hwc, hwc->idx);
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barrier(); /* why? */
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armpmu_event_update(event, hwc, hwc->idx);
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hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE;
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}
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}
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static void
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armpmu_start(struct perf_event *event, int flags)
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{
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struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
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struct hw_perf_event *hwc = &event->hw;
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/*
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* ARM pmu always has to reprogram the period, so ignore
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* PERF_EF_RELOAD, see the comment below.
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*/
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if (flags & PERF_EF_RELOAD)
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WARN_ON_ONCE(!(hwc->state & PERF_HES_UPTODATE));
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hwc->state = 0;
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/*
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* Set the period again. Some counters can't be stopped, so when we
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* were stopped we simply disabled the IRQ source and the counter
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* may have been left counting. If we don't do this step then we may
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* get an interrupt too soon or *way* too late if the overflow has
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* happened since disabling.
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*/
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armpmu_event_set_period(event, hwc, hwc->idx);
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armpmu->enable(hwc, hwc->idx);
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}
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static void
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armpmu_del(struct perf_event *event, int flags)
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{
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struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
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struct pmu_hw_events *hw_events = armpmu->get_hw_events();
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struct hw_perf_event *hwc = &event->hw;
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int idx = hwc->idx;
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WARN_ON(idx < 0);
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armpmu_stop(event, PERF_EF_UPDATE);
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hw_events->events[idx] = NULL;
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clear_bit(idx, hw_events->used_mask);
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perf_event_update_userpage(event);
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}
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static int
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armpmu_add(struct perf_event *event, int flags)
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{
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struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
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struct pmu_hw_events *hw_events = armpmu->get_hw_events();
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struct hw_perf_event *hwc = &event->hw;
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int idx;
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int err = 0;
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perf_pmu_disable(event->pmu);
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/* If we don't have a space for the counter then finish early. */
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idx = armpmu->get_event_idx(hw_events, hwc);
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if (idx < 0) {
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err = idx;
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goto out;
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}
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/*
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* If there is an event in the counter we are going to use then make
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* sure it is disabled.
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*/
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event->hw.idx = idx;
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armpmu->disable(hwc, idx);
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hw_events->events[idx] = event;
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hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE;
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if (flags & PERF_EF_START)
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armpmu_start(event, PERF_EF_RELOAD);
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/* Propagate our changes to the userspace mapping. */
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perf_event_update_userpage(event);
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out:
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perf_pmu_enable(event->pmu);
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return err;
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}
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static int
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validate_event(struct pmu_hw_events *hw_events,
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struct perf_event *event)
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{
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struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
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struct hw_perf_event fake_event = event->hw;
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struct pmu *leader_pmu = event->group_leader->pmu;
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if (is_software_event(event))
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return 1;
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if (event->pmu != leader_pmu || event->state < PERF_EVENT_STATE_OFF)
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return 1;
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if (event->state == PERF_EVENT_STATE_OFF && !event->attr.enable_on_exec)
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return 1;
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return armpmu->get_event_idx(hw_events, &fake_event) >= 0;
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}
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static int
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validate_group(struct perf_event *event)
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{
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struct perf_event *sibling, *leader = event->group_leader;
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struct pmu_hw_events fake_pmu;
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DECLARE_BITMAP(fake_used_mask, ARMPMU_MAX_HWEVENTS);
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/*
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* Initialise the fake PMU. We only need to populate the
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* used_mask for the purposes of validation.
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*/
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memset(fake_used_mask, 0, sizeof(fake_used_mask));
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fake_pmu.used_mask = fake_used_mask;
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if (!validate_event(&fake_pmu, leader))
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return -EINVAL;
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list_for_each_entry(sibling, &leader->sibling_list, group_entry) {
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if (!validate_event(&fake_pmu, sibling))
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return -EINVAL;
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}
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if (!validate_event(&fake_pmu, event))
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return -EINVAL;
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return 0;
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}
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static void
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armpmu_disable_percpu_irq(void *data)
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{
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unsigned int irq = *(unsigned int *)data;
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disable_percpu_irq(irq);
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}
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static void
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armpmu_release_hardware(struct arm_pmu *armpmu)
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{
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int irq;
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unsigned int i, irqs;
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struct platform_device *pmu_device = armpmu->plat_device;
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irqs = min(pmu_device->num_resources, num_possible_cpus());
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if (!irqs)
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return;
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irq = platform_get_irq(pmu_device, 0);
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if (irq <= 0)
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return;
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if (irq_is_percpu(irq)) {
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on_each_cpu(armpmu_disable_percpu_irq, &irq, 1);
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free_percpu_irq(irq, &cpu_hw_events);
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} else {
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for (i = 0; i < irqs; ++i) {
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if (!cpumask_test_and_clear_cpu(i, &armpmu->active_irqs))
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continue;
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irq = platform_get_irq(pmu_device, i);
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if (irq > 0)
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free_irq(irq, armpmu);
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}
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}
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}
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static void
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armpmu_enable_percpu_irq(void *data)
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{
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unsigned int irq = *(unsigned int *)data;
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enable_percpu_irq(irq, IRQ_TYPE_NONE);
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}
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static int
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armpmu_reserve_hardware(struct arm_pmu *armpmu)
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{
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int err, irq;
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unsigned int i, irqs;
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struct platform_device *pmu_device = armpmu->plat_device;
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if (!pmu_device) {
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pr_err("no PMU device registered\n");
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return -ENODEV;
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}
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irqs = min(pmu_device->num_resources, num_possible_cpus());
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if (!irqs) {
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pr_err("no irqs for PMUs defined\n");
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return -ENODEV;
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}
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irq = platform_get_irq(pmu_device, 0);
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if (irq <= 0) {
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pr_err("failed to get valid irq for PMU device\n");
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return -ENODEV;
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}
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if (irq_is_percpu(irq)) {
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err = request_percpu_irq(irq, armpmu->handle_irq,
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"arm-pmu", &cpu_hw_events);
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if (err) {
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pr_err("unable to request percpu IRQ%d for ARM PMU counters\n",
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irq);
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armpmu_release_hardware(armpmu);
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return err;
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}
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on_each_cpu(armpmu_enable_percpu_irq, &irq, 1);
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} else {
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for (i = 0; i < irqs; ++i) {
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err = 0;
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irq = platform_get_irq(pmu_device, i);
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if (irq <= 0)
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continue;
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/*
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* If we have a single PMU interrupt that we can't shift,
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* assume that we're running on a uniprocessor machine and
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* continue. Otherwise, continue without this interrupt.
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*/
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if (irq_set_affinity(irq, cpumask_of(i)) && irqs > 1) {
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pr_warning("unable to set irq affinity (irq=%d, cpu=%u)\n",
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irq, i);
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continue;
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}
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err = request_irq(irq, armpmu->handle_irq,
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IRQF_NOBALANCING,
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"arm-pmu", armpmu);
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if (err) {
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pr_err("unable to request IRQ%d for ARM PMU counters\n",
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irq);
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armpmu_release_hardware(armpmu);
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return err;
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}
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cpumask_set_cpu(i, &armpmu->active_irqs);
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}
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}
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return 0;
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}
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|
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static void
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hw_perf_event_destroy(struct perf_event *event)
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{
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struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
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atomic_t *active_events = &armpmu->active_events;
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struct mutex *pmu_reserve_mutex = &armpmu->reserve_mutex;
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if (atomic_dec_and_mutex_lock(active_events, pmu_reserve_mutex)) {
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armpmu_release_hardware(armpmu);
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mutex_unlock(pmu_reserve_mutex);
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}
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}
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|
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static int
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event_requires_mode_exclusion(struct perf_event_attr *attr)
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{
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return attr->exclude_idle || attr->exclude_user ||
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attr->exclude_kernel || attr->exclude_hv;
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}
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|
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static int
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__hw_perf_event_init(struct perf_event *event)
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{
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struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
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struct hw_perf_event *hwc = &event->hw;
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int mapping, err;
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|
|
mapping = armpmu->map_event(event);
|
|
|
|
if (mapping < 0) {
|
|
pr_debug("event %x:%llx not supported\n", event->attr.type,
|
|
event->attr.config);
|
|
return mapping;
|
|
}
|
|
|
|
/*
|
|
* We don't assign an index until we actually place the event onto
|
|
* hardware. Use -1 to signify that we haven't decided where to put it
|
|
* yet. For SMP systems, each core has it's own PMU so we can't do any
|
|
* clever allocation or constraints checking at this point.
|
|
*/
|
|
hwc->idx = -1;
|
|
hwc->config_base = 0;
|
|
hwc->config = 0;
|
|
hwc->event_base = 0;
|
|
|
|
/*
|
|
* Check whether we need to exclude the counter from certain modes.
|
|
*/
|
|
if ((!armpmu->set_event_filter ||
|
|
armpmu->set_event_filter(hwc, &event->attr)) &&
|
|
event_requires_mode_exclusion(&event->attr)) {
|
|
pr_debug("ARM performance counters do not support mode exclusion\n");
|
|
return -EPERM;
|
|
}
|
|
|
|
/*
|
|
* Store the event encoding into the config_base field.
|
|
*/
|
|
hwc->config_base |= (unsigned long)mapping;
|
|
|
|
if (!hwc->sample_period) {
|
|
/*
|
|
* For non-sampling runs, limit the sample_period to half
|
|
* of the counter width. That way, the new counter value
|
|
* is far less likely to overtake the previous one unless
|
|
* you have some serious IRQ latency issues.
|
|
*/
|
|
hwc->sample_period = armpmu->max_period >> 1;
|
|
hwc->last_period = hwc->sample_period;
|
|
local64_set(&hwc->period_left, hwc->sample_period);
|
|
}
|
|
|
|
err = 0;
|
|
if (event->group_leader != event) {
|
|
err = validate_group(event);
|
|
if (err)
|
|
return -EINVAL;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int armpmu_event_init(struct perf_event *event)
|
|
{
|
|
struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
|
|
int err = 0;
|
|
atomic_t *active_events = &armpmu->active_events;
|
|
|
|
if (armpmu->map_event(event) == -ENOENT)
|
|
return -ENOENT;
|
|
|
|
event->destroy = hw_perf_event_destroy;
|
|
|
|
if (!atomic_inc_not_zero(active_events)) {
|
|
mutex_lock(&armpmu->reserve_mutex);
|
|
if (atomic_read(active_events) == 0)
|
|
err = armpmu_reserve_hardware(armpmu);
|
|
|
|
if (!err)
|
|
atomic_inc(active_events);
|
|
mutex_unlock(&armpmu->reserve_mutex);
|
|
}
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
err = __hw_perf_event_init(event);
|
|
if (err)
|
|
hw_perf_event_destroy(event);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void armpmu_enable(struct pmu *pmu)
|
|
{
|
|
struct arm_pmu *armpmu = to_arm_pmu(pmu);
|
|
struct pmu_hw_events *hw_events = armpmu->get_hw_events();
|
|
int enabled = bitmap_weight(hw_events->used_mask, armpmu->num_events);
|
|
|
|
if (enabled)
|
|
armpmu->start();
|
|
}
|
|
|
|
static void armpmu_disable(struct pmu *pmu)
|
|
{
|
|
struct arm_pmu *armpmu = to_arm_pmu(pmu);
|
|
armpmu->stop();
|
|
}
|
|
|
|
static void __init armpmu_init(struct arm_pmu *armpmu)
|
|
{
|
|
atomic_set(&armpmu->active_events, 0);
|
|
mutex_init(&armpmu->reserve_mutex);
|
|
|
|
armpmu->pmu = (struct pmu) {
|
|
.pmu_enable = armpmu_enable,
|
|
.pmu_disable = armpmu_disable,
|
|
.event_init = armpmu_event_init,
|
|
.add = armpmu_add,
|
|
.del = armpmu_del,
|
|
.start = armpmu_start,
|
|
.stop = armpmu_stop,
|
|
.read = armpmu_read,
|
|
};
|
|
}
|
|
|
|
int __init armpmu_register(struct arm_pmu *armpmu, char *name, int type)
|
|
{
|
|
armpmu_init(armpmu);
|
|
return perf_pmu_register(&armpmu->pmu, name, type);
|
|
}
|
|
|
|
/*
|
|
* ARMv8 PMUv3 Performance Events handling code.
|
|
* Common event types.
|
|
*/
|
|
enum armv8_pmuv3_perf_types {
|
|
/* Required events. */
|
|
ARMV8_PMUV3_PERFCTR_PMNC_SW_INCR = 0x00,
|
|
ARMV8_PMUV3_PERFCTR_L1_DCACHE_REFILL = 0x03,
|
|
ARMV8_PMUV3_PERFCTR_L1_DCACHE_ACCESS = 0x04,
|
|
ARMV8_PMUV3_PERFCTR_PC_BRANCH_MIS_PRED = 0x10,
|
|
ARMV8_PMUV3_PERFCTR_CLOCK_CYCLES = 0x11,
|
|
ARMV8_PMUV3_PERFCTR_PC_BRANCH_PRED = 0x12,
|
|
|
|
/* At least one of the following is required. */
|
|
ARMV8_PMUV3_PERFCTR_INSTR_EXECUTED = 0x08,
|
|
ARMV8_PMUV3_PERFCTR_OP_SPEC = 0x1B,
|
|
|
|
/* Common architectural events. */
|
|
ARMV8_PMUV3_PERFCTR_MEM_READ = 0x06,
|
|
ARMV8_PMUV3_PERFCTR_MEM_WRITE = 0x07,
|
|
ARMV8_PMUV3_PERFCTR_EXC_TAKEN = 0x09,
|
|
ARMV8_PMUV3_PERFCTR_EXC_EXECUTED = 0x0A,
|
|
ARMV8_PMUV3_PERFCTR_CID_WRITE = 0x0B,
|
|
ARMV8_PMUV3_PERFCTR_PC_WRITE = 0x0C,
|
|
ARMV8_PMUV3_PERFCTR_PC_IMM_BRANCH = 0x0D,
|
|
ARMV8_PMUV3_PERFCTR_PC_PROC_RETURN = 0x0E,
|
|
ARMV8_PMUV3_PERFCTR_MEM_UNALIGNED_ACCESS = 0x0F,
|
|
ARMV8_PMUV3_PERFCTR_TTBR_WRITE = 0x1C,
|
|
|
|
/* Common microarchitectural events. */
|
|
ARMV8_PMUV3_PERFCTR_L1_ICACHE_REFILL = 0x01,
|
|
ARMV8_PMUV3_PERFCTR_ITLB_REFILL = 0x02,
|
|
ARMV8_PMUV3_PERFCTR_DTLB_REFILL = 0x05,
|
|
ARMV8_PMUV3_PERFCTR_MEM_ACCESS = 0x13,
|
|
ARMV8_PMUV3_PERFCTR_L1_ICACHE_ACCESS = 0x14,
|
|
ARMV8_PMUV3_PERFCTR_L1_DCACHE_WB = 0x15,
|
|
ARMV8_PMUV3_PERFCTR_L2_CACHE_ACCESS = 0x16,
|
|
ARMV8_PMUV3_PERFCTR_L2_CACHE_REFILL = 0x17,
|
|
ARMV8_PMUV3_PERFCTR_L2_CACHE_WB = 0x18,
|
|
ARMV8_PMUV3_PERFCTR_BUS_ACCESS = 0x19,
|
|
ARMV8_PMUV3_PERFCTR_MEM_ERROR = 0x1A,
|
|
ARMV8_PMUV3_PERFCTR_BUS_CYCLES = 0x1D,
|
|
};
|
|
|
|
/* PMUv3 HW events mapping. */
|
|
static const unsigned armv8_pmuv3_perf_map[PERF_COUNT_HW_MAX] = {
|
|
[PERF_COUNT_HW_CPU_CYCLES] = ARMV8_PMUV3_PERFCTR_CLOCK_CYCLES,
|
|
[PERF_COUNT_HW_INSTRUCTIONS] = ARMV8_PMUV3_PERFCTR_INSTR_EXECUTED,
|
|
[PERF_COUNT_HW_CACHE_REFERENCES] = ARMV8_PMUV3_PERFCTR_L1_DCACHE_ACCESS,
|
|
[PERF_COUNT_HW_CACHE_MISSES] = ARMV8_PMUV3_PERFCTR_L1_DCACHE_REFILL,
|
|
[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = HW_OP_UNSUPPORTED,
|
|
[PERF_COUNT_HW_BRANCH_MISSES] = ARMV8_PMUV3_PERFCTR_PC_BRANCH_MIS_PRED,
|
|
[PERF_COUNT_HW_BUS_CYCLES] = HW_OP_UNSUPPORTED,
|
|
[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = HW_OP_UNSUPPORTED,
|
|
[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = HW_OP_UNSUPPORTED,
|
|
};
|
|
|
|
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] = {
|
|
[C(L1D)] = {
|
|
[C(OP_READ)] = {
|
|
[C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_L1_DCACHE_ACCESS,
|
|
[C(RESULT_MISS)] = ARMV8_PMUV3_PERFCTR_L1_DCACHE_REFILL,
|
|
},
|
|
[C(OP_WRITE)] = {
|
|
[C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_L1_DCACHE_ACCESS,
|
|
[C(RESULT_MISS)] = ARMV8_PMUV3_PERFCTR_L1_DCACHE_REFILL,
|
|
},
|
|
[C(OP_PREFETCH)] = {
|
|
[C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
|
|
[C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
|
|
},
|
|
},
|
|
[C(L1I)] = {
|
|
[C(OP_READ)] = {
|
|
[C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
|
|
[C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
|
|
},
|
|
[C(OP_WRITE)] = {
|
|
[C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
|
|
[C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
|
|
},
|
|
[C(OP_PREFETCH)] = {
|
|
[C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
|
|
[C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
|
|
},
|
|
},
|
|
[C(LL)] = {
|
|
[C(OP_READ)] = {
|
|
[C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
|
|
[C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
|
|
},
|
|
[C(OP_WRITE)] = {
|
|
[C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
|
|
[C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
|
|
},
|
|
[C(OP_PREFETCH)] = {
|
|
[C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
|
|
[C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
|
|
},
|
|
},
|
|
[C(DTLB)] = {
|
|
[C(OP_READ)] = {
|
|
[C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
|
|
[C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
|
|
},
|
|
[C(OP_WRITE)] = {
|
|
[C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
|
|
[C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
|
|
},
|
|
[C(OP_PREFETCH)] = {
|
|
[C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
|
|
[C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
|
|
},
|
|
},
|
|
[C(ITLB)] = {
|
|
[C(OP_READ)] = {
|
|
[C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
|
|
[C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
|
|
},
|
|
[C(OP_WRITE)] = {
|
|
[C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
|
|
[C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
|
|
},
|
|
[C(OP_PREFETCH)] = {
|
|
[C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
|
|
[C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
|
|
},
|
|
},
|
|
[C(BPU)] = {
|
|
[C(OP_READ)] = {
|
|
[C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_PC_BRANCH_PRED,
|
|
[C(RESULT_MISS)] = ARMV8_PMUV3_PERFCTR_PC_BRANCH_MIS_PRED,
|
|
},
|
|
[C(OP_WRITE)] = {
|
|
[C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_PC_BRANCH_PRED,
|
|
[C(RESULT_MISS)] = ARMV8_PMUV3_PERFCTR_PC_BRANCH_MIS_PRED,
|
|
},
|
|
[C(OP_PREFETCH)] = {
|
|
[C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
|
|
[C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
|
|
},
|
|
},
|
|
[C(NODE)] = {
|
|
[C(OP_READ)] = {
|
|
[C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
|
|
[C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
|
|
},
|
|
[C(OP_WRITE)] = {
|
|
[C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
|
|
[C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
|
|
},
|
|
[C(OP_PREFETCH)] = {
|
|
[C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
|
|
[C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
|
|
},
|
|
},
|
|
};
|
|
|
|
/*
|
|
* Perf Events' indices
|
|
*/
|
|
#define ARMV8_IDX_CYCLE_COUNTER 0
|
|
#define ARMV8_IDX_COUNTER0 1
|
|
#define ARMV8_IDX_COUNTER_LAST (ARMV8_IDX_CYCLE_COUNTER + cpu_pmu->num_events - 1)
|
|
|
|
#define ARMV8_MAX_COUNTERS 32
|
|
#define ARMV8_COUNTER_MASK (ARMV8_MAX_COUNTERS - 1)
|
|
|
|
/*
|
|
* ARMv8 low level PMU access
|
|
*/
|
|
|
|
/*
|
|
* Perf Event to low level counters mapping
|
|
*/
|
|
#define ARMV8_IDX_TO_COUNTER(x) \
|
|
(((x) - ARMV8_IDX_COUNTER0) & ARMV8_COUNTER_MASK)
|
|
|
|
/*
|
|
* Per-CPU PMCR: config reg
|
|
*/
|
|
#define ARMV8_PMCR_E (1 << 0) /* Enable all counters */
|
|
#define ARMV8_PMCR_P (1 << 1) /* Reset all counters */
|
|
#define ARMV8_PMCR_C (1 << 2) /* Cycle counter reset */
|
|
#define ARMV8_PMCR_D (1 << 3) /* CCNT counts every 64th cpu cycle */
|
|
#define ARMV8_PMCR_X (1 << 4) /* Export to ETM */
|
|
#define ARMV8_PMCR_DP (1 << 5) /* Disable CCNT if non-invasive debug*/
|
|
#define ARMV8_PMCR_N_SHIFT 11 /* Number of counters supported */
|
|
#define ARMV8_PMCR_N_MASK 0x1f
|
|
#define ARMV8_PMCR_MASK 0x3f /* Mask for writable bits */
|
|
|
|
/*
|
|
* PMOVSR: counters overflow flag status reg
|
|
*/
|
|
#define ARMV8_OVSR_MASK 0xffffffff /* Mask for writable bits */
|
|
#define ARMV8_OVERFLOWED_MASK ARMV8_OVSR_MASK
|
|
|
|
/*
|
|
* PMXEVTYPER: Event selection reg
|
|
*/
|
|
#define ARMV8_EVTYPE_MASK 0xc80003ff /* Mask for writable bits */
|
|
#define ARMV8_EVTYPE_EVENT 0x3ff /* Mask for EVENT bits */
|
|
|
|
/*
|
|
* Event filters for PMUv3
|
|
*/
|
|
#define ARMV8_EXCLUDE_EL1 (1 << 31)
|
|
#define ARMV8_EXCLUDE_EL0 (1 << 30)
|
|
#define ARMV8_INCLUDE_EL2 (1 << 27)
|
|
|
|
static inline u32 armv8pmu_pmcr_read(void)
|
|
{
|
|
u32 val;
|
|
asm volatile("mrs %0, pmcr_el0" : "=r" (val));
|
|
return val;
|
|
}
|
|
|
|
static inline void armv8pmu_pmcr_write(u32 val)
|
|
{
|
|
val &= ARMV8_PMCR_MASK;
|
|
isb();
|
|
asm volatile("msr pmcr_el0, %0" :: "r" (val));
|
|
}
|
|
|
|
static inline int armv8pmu_has_overflowed(u32 pmovsr)
|
|
{
|
|
return pmovsr & ARMV8_OVERFLOWED_MASK;
|
|
}
|
|
|
|
static inline int armv8pmu_counter_valid(int idx)
|
|
{
|
|
return idx >= ARMV8_IDX_CYCLE_COUNTER && idx <= ARMV8_IDX_COUNTER_LAST;
|
|
}
|
|
|
|
static inline int armv8pmu_counter_has_overflowed(u32 pmnc, int idx)
|
|
{
|
|
int ret = 0;
|
|
u32 counter;
|
|
|
|
if (!armv8pmu_counter_valid(idx)) {
|
|
pr_err("CPU%u checking wrong counter %d overflow status\n",
|
|
smp_processor_id(), idx);
|
|
} else {
|
|
counter = ARMV8_IDX_TO_COUNTER(idx);
|
|
ret = pmnc & BIT(counter);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline int armv8pmu_select_counter(int idx)
|
|
{
|
|
u32 counter;
|
|
|
|
if (!armv8pmu_counter_valid(idx)) {
|
|
pr_err("CPU%u selecting wrong PMNC counter %d\n",
|
|
smp_processor_id(), idx);
|
|
return -EINVAL;
|
|
}
|
|
|
|
counter = ARMV8_IDX_TO_COUNTER(idx);
|
|
asm volatile("msr pmselr_el0, %0" :: "r" (counter));
|
|
isb();
|
|
|
|
return idx;
|
|
}
|
|
|
|
static inline u32 armv8pmu_read_counter(int idx)
|
|
{
|
|
u32 value = 0;
|
|
|
|
if (!armv8pmu_counter_valid(idx))
|
|
pr_err("CPU%u reading wrong counter %d\n",
|
|
smp_processor_id(), idx);
|
|
else if (idx == ARMV8_IDX_CYCLE_COUNTER)
|
|
asm volatile("mrs %0, pmccntr_el0" : "=r" (value));
|
|
else if (armv8pmu_select_counter(idx) == idx)
|
|
asm volatile("mrs %0, pmxevcntr_el0" : "=r" (value));
|
|
|
|
return value;
|
|
}
|
|
|
|
static inline void armv8pmu_write_counter(int idx, u32 value)
|
|
{
|
|
if (!armv8pmu_counter_valid(idx))
|
|
pr_err("CPU%u writing wrong counter %d\n",
|
|
smp_processor_id(), idx);
|
|
else if (idx == ARMV8_IDX_CYCLE_COUNTER)
|
|
asm volatile("msr pmccntr_el0, %0" :: "r" (value));
|
|
else if (armv8pmu_select_counter(idx) == idx)
|
|
asm volatile("msr pmxevcntr_el0, %0" :: "r" (value));
|
|
}
|
|
|
|
static inline void armv8pmu_write_evtype(int idx, u32 val)
|
|
{
|
|
if (armv8pmu_select_counter(idx) == idx) {
|
|
val &= ARMV8_EVTYPE_MASK;
|
|
asm volatile("msr pmxevtyper_el0, %0" :: "r" (val));
|
|
}
|
|
}
|
|
|
|
static inline int armv8pmu_enable_counter(int idx)
|
|
{
|
|
u32 counter;
|
|
|
|
if (!armv8pmu_counter_valid(idx)) {
|
|
pr_err("CPU%u enabling wrong PMNC counter %d\n",
|
|
smp_processor_id(), idx);
|
|
return -EINVAL;
|
|
}
|
|
|
|
counter = ARMV8_IDX_TO_COUNTER(idx);
|
|
asm volatile("msr pmcntenset_el0, %0" :: "r" (BIT(counter)));
|
|
return idx;
|
|
}
|
|
|
|
static inline int armv8pmu_disable_counter(int idx)
|
|
{
|
|
u32 counter;
|
|
|
|
if (!armv8pmu_counter_valid(idx)) {
|
|
pr_err("CPU%u disabling wrong PMNC counter %d\n",
|
|
smp_processor_id(), idx);
|
|
return -EINVAL;
|
|
}
|
|
|
|
counter = ARMV8_IDX_TO_COUNTER(idx);
|
|
asm volatile("msr pmcntenclr_el0, %0" :: "r" (BIT(counter)));
|
|
return idx;
|
|
}
|
|
|
|
static inline int armv8pmu_enable_intens(int idx)
|
|
{
|
|
u32 counter;
|
|
|
|
if (!armv8pmu_counter_valid(idx)) {
|
|
pr_err("CPU%u enabling wrong PMNC counter IRQ enable %d\n",
|
|
smp_processor_id(), idx);
|
|
return -EINVAL;
|
|
}
|
|
|
|
counter = ARMV8_IDX_TO_COUNTER(idx);
|
|
asm volatile("msr pmintenset_el1, %0" :: "r" (BIT(counter)));
|
|
return idx;
|
|
}
|
|
|
|
static inline int armv8pmu_disable_intens(int idx)
|
|
{
|
|
u32 counter;
|
|
|
|
if (!armv8pmu_counter_valid(idx)) {
|
|
pr_err("CPU%u disabling wrong PMNC counter IRQ enable %d\n",
|
|
smp_processor_id(), idx);
|
|
return -EINVAL;
|
|
}
|
|
|
|
counter = ARMV8_IDX_TO_COUNTER(idx);
|
|
asm volatile("msr pmintenclr_el1, %0" :: "r" (BIT(counter)));
|
|
isb();
|
|
/* Clear the overflow flag in case an interrupt is pending. */
|
|
asm volatile("msr pmovsclr_el0, %0" :: "r" (BIT(counter)));
|
|
isb();
|
|
return idx;
|
|
}
|
|
|
|
static inline u32 armv8pmu_getreset_flags(void)
|
|
{
|
|
u32 value;
|
|
|
|
/* Read */
|
|
asm volatile("mrs %0, pmovsclr_el0" : "=r" (value));
|
|
|
|
/* Write to clear flags */
|
|
value &= ARMV8_OVSR_MASK;
|
|
asm volatile("msr pmovsclr_el0, %0" :: "r" (value));
|
|
|
|
return value;
|
|
}
|
|
|
|
static void armv8pmu_enable_event(struct hw_perf_event *hwc, int idx)
|
|
{
|
|
unsigned long flags;
|
|
struct pmu_hw_events *events = cpu_pmu->get_hw_events();
|
|
|
|
/*
|
|
* Enable counter and interrupt, and set the counter to count
|
|
* the event that we're interested in.
|
|
*/
|
|
raw_spin_lock_irqsave(&events->pmu_lock, flags);
|
|
|
|
/*
|
|
* Disable counter
|
|
*/
|
|
armv8pmu_disable_counter(idx);
|
|
|
|
/*
|
|
* Set event (if destined for PMNx counters).
|
|
*/
|
|
armv8pmu_write_evtype(idx, hwc->config_base);
|
|
|
|
/*
|
|
* Enable interrupt for this counter
|
|
*/
|
|
armv8pmu_enable_intens(idx);
|
|
|
|
/*
|
|
* Enable counter
|
|
*/
|
|
armv8pmu_enable_counter(idx);
|
|
|
|
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
|
|
}
|
|
|
|
static void armv8pmu_disable_event(struct hw_perf_event *hwc, int idx)
|
|
{
|
|
unsigned long flags;
|
|
struct pmu_hw_events *events = cpu_pmu->get_hw_events();
|
|
|
|
/*
|
|
* Disable counter and interrupt
|
|
*/
|
|
raw_spin_lock_irqsave(&events->pmu_lock, flags);
|
|
|
|
/*
|
|
* Disable counter
|
|
*/
|
|
armv8pmu_disable_counter(idx);
|
|
|
|
/*
|
|
* Disable interrupt for this counter
|
|
*/
|
|
armv8pmu_disable_intens(idx);
|
|
|
|
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
|
|
}
|
|
|
|
static irqreturn_t armv8pmu_handle_irq(int irq_num, void *dev)
|
|
{
|
|
u32 pmovsr;
|
|
struct perf_sample_data data;
|
|
struct pmu_hw_events *cpuc;
|
|
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();
|
|
|
|
cpuc = this_cpu_ptr(&cpu_hw_events);
|
|
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, hwc, idx);
|
|
perf_sample_data_init(&data, 0, hwc->last_period);
|
|
if (!armpmu_event_set_period(event, hwc, idx))
|
|
continue;
|
|
|
|
if (perf_event_overflow(event, &data, regs))
|
|
cpu_pmu->disable(hwc, idx);
|
|
}
|
|
|
|
/*
|
|
* Handle the pending perf events.
|
|
*
|
|
* Note: this call *must* be run with interrupts disabled. For
|
|
* platforms that can have the PMU interrupts raised as an NMI, this
|
|
* will not work.
|
|
*/
|
|
irq_work_run();
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void armv8pmu_start(void)
|
|
{
|
|
unsigned long flags;
|
|
struct pmu_hw_events *events = cpu_pmu->get_hw_events();
|
|
|
|
raw_spin_lock_irqsave(&events->pmu_lock, flags);
|
|
/* Enable all counters */
|
|
armv8pmu_pmcr_write(armv8pmu_pmcr_read() | ARMV8_PMCR_E);
|
|
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
|
|
}
|
|
|
|
static void armv8pmu_stop(void)
|
|
{
|
|
unsigned long flags;
|
|
struct pmu_hw_events *events = cpu_pmu->get_hw_events();
|
|
|
|
raw_spin_lock_irqsave(&events->pmu_lock, flags);
|
|
/* Disable all counters */
|
|
armv8pmu_pmcr_write(armv8pmu_pmcr_read() & ~ARMV8_PMCR_E);
|
|
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
|
|
}
|
|
|
|
static int armv8pmu_get_event_idx(struct pmu_hw_events *cpuc,
|
|
struct hw_perf_event *event)
|
|
{
|
|
int idx;
|
|
unsigned long evtype = event->config_base & ARMV8_EVTYPE_EVENT;
|
|
|
|
/* Always place a cycle counter into the cycle counter. */
|
|
if (evtype == ARMV8_PMUV3_PERFCTR_CLOCK_CYCLES) {
|
|
if (test_and_set_bit(ARMV8_IDX_CYCLE_COUNTER, cpuc->used_mask))
|
|
return -EAGAIN;
|
|
|
|
return ARMV8_IDX_CYCLE_COUNTER;
|
|
}
|
|
|
|
/*
|
|
* For anything other than a cycle counter, try and use
|
|
* the events counters
|
|
*/
|
|
for (idx = ARMV8_IDX_COUNTER0; idx < cpu_pmu->num_events; ++idx) {
|
|
if (!test_and_set_bit(idx, cpuc->used_mask))
|
|
return idx;
|
|
}
|
|
|
|
/* The counters are all in use. */
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/*
|
|
* Add an event filter to a given event. This will only work for PMUv2 PMUs.
|
|
*/
|
|
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 (attr->exclude_user)
|
|
config_base |= ARMV8_EXCLUDE_EL0;
|
|
if (attr->exclude_kernel)
|
|
config_base |= ARMV8_EXCLUDE_EL1;
|
|
if (!attr->exclude_hv)
|
|
config_base |= ARMV8_INCLUDE_EL2;
|
|
|
|
/*
|
|
* Install the filter into config_base as this is used to
|
|
* construct the event type.
|
|
*/
|
|
event->config_base = config_base;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void armv8pmu_reset(void *info)
|
|
{
|
|
u32 idx, nb_cnt = cpu_pmu->num_events;
|
|
|
|
/* The counter and interrupt enable registers are unknown at reset. */
|
|
for (idx = ARMV8_IDX_CYCLE_COUNTER; idx < nb_cnt; ++idx)
|
|
armv8pmu_disable_event(NULL, idx);
|
|
|
|
/* Initialize & Reset PMNC: C and P bits. */
|
|
armv8pmu_pmcr_write(ARMV8_PMCR_P | ARMV8_PMCR_C);
|
|
|
|
/* Disable access from userspace. */
|
|
asm volatile("msr pmuserenr_el0, %0" :: "r" (0));
|
|
}
|
|
|
|
static int armv8_pmuv3_map_event(struct perf_event *event)
|
|
{
|
|
return map_cpu_event(event, &armv8_pmuv3_perf_map,
|
|
&armv8_pmuv3_perf_cache_map,
|
|
ARMV8_EVTYPE_EVENT);
|
|
}
|
|
|
|
static struct arm_pmu armv8pmu = {
|
|
.handle_irq = armv8pmu_handle_irq,
|
|
.enable = armv8pmu_enable_event,
|
|
.disable = armv8pmu_disable_event,
|
|
.read_counter = armv8pmu_read_counter,
|
|
.write_counter = armv8pmu_write_counter,
|
|
.get_event_idx = armv8pmu_get_event_idx,
|
|
.start = armv8pmu_start,
|
|
.stop = armv8pmu_stop,
|
|
.reset = armv8pmu_reset,
|
|
.max_period = (1LLU << 32) - 1,
|
|
};
|
|
|
|
static u32 __init armv8pmu_read_num_pmnc_events(void)
|
|
{
|
|
u32 nb_cnt;
|
|
|
|
/* Read the nb of CNTx counters supported from PMNC */
|
|
nb_cnt = (armv8pmu_pmcr_read() >> ARMV8_PMCR_N_SHIFT) & ARMV8_PMCR_N_MASK;
|
|
|
|
/* Add the CPU cycles counter and return */
|
|
return nb_cnt + 1;
|
|
}
|
|
|
|
static struct arm_pmu *__init armv8_pmuv3_pmu_init(void)
|
|
{
|
|
armv8pmu.name = "arm/armv8-pmuv3";
|
|
armv8pmu.map_event = armv8_pmuv3_map_event;
|
|
armv8pmu.num_events = armv8pmu_read_num_pmnc_events();
|
|
armv8pmu.set_event_filter = armv8pmu_set_event_filter;
|
|
return &armv8pmu;
|
|
}
|
|
|
|
/*
|
|
* Ensure the PMU has sane values out of reset.
|
|
* This requires SMP to be available, so exists as a separate initcall.
|
|
*/
|
|
static int __init
|
|
cpu_pmu_reset(void)
|
|
{
|
|
if (cpu_pmu && cpu_pmu->reset)
|
|
return on_each_cpu(cpu_pmu->reset, NULL, 1);
|
|
return 0;
|
|
}
|
|
arch_initcall(cpu_pmu_reset);
|
|
|
|
/*
|
|
* PMU platform driver and devicetree bindings.
|
|
*/
|
|
static struct of_device_id armpmu_of_device_ids[] = {
|
|
{.compatible = "arm,armv8-pmuv3"},
|
|
{},
|
|
};
|
|
|
|
static int armpmu_device_probe(struct platform_device *pdev)
|
|
{
|
|
if (!cpu_pmu)
|
|
return -ENODEV;
|
|
|
|
cpu_pmu->plat_device = pdev;
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver armpmu_driver = {
|
|
.driver = {
|
|
.name = "arm-pmu",
|
|
.of_match_table = armpmu_of_device_ids,
|
|
},
|
|
.probe = armpmu_device_probe,
|
|
};
|
|
|
|
static int __init register_pmu_driver(void)
|
|
{
|
|
return platform_driver_register(&armpmu_driver);
|
|
}
|
|
device_initcall(register_pmu_driver);
|
|
|
|
static struct pmu_hw_events *armpmu_get_cpu_events(void)
|
|
{
|
|
return this_cpu_ptr(&cpu_hw_events);
|
|
}
|
|
|
|
static void __init cpu_pmu_init(struct arm_pmu *armpmu)
|
|
{
|
|
int cpu;
|
|
for_each_possible_cpu(cpu) {
|
|
struct pmu_hw_events *events = &per_cpu(cpu_hw_events, cpu);
|
|
events->events = per_cpu(hw_events, cpu);
|
|
events->used_mask = per_cpu(used_mask, cpu);
|
|
raw_spin_lock_init(&events->pmu_lock);
|
|
}
|
|
armpmu->get_hw_events = armpmu_get_cpu_events;
|
|
}
|
|
|
|
static int __init init_hw_perf_events(void)
|
|
{
|
|
u64 dfr = read_cpuid(ID_AA64DFR0_EL1);
|
|
|
|
switch ((dfr >> 8) & 0xf) {
|
|
case 0x1: /* PMUv3 */
|
|
cpu_pmu = armv8_pmuv3_pmu_init();
|
|
break;
|
|
}
|
|
|
|
if (cpu_pmu) {
|
|
pr_info("enabled with %s PMU driver, %d counters available\n",
|
|
cpu_pmu->name, cpu_pmu->num_events);
|
|
cpu_pmu_init(cpu_pmu);
|
|
armpmu_register(cpu_pmu, "cpu", PERF_TYPE_RAW);
|
|
} else {
|
|
pr_info("no hardware support available\n");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
early_initcall(init_hw_perf_events);
|
|
|
|
/*
|
|
* Callchain handling code.
|
|
*/
|
|
struct frame_tail {
|
|
struct frame_tail __user *fp;
|
|
unsigned long lr;
|
|
} __attribute__((packed));
|
|
|
|
/*
|
|
* Get the return address for a single stackframe and return a pointer to the
|
|
* next frame tail.
|
|
*/
|
|
static struct frame_tail __user *
|
|
user_backtrace(struct frame_tail __user *tail,
|
|
struct perf_callchain_entry *entry)
|
|
{
|
|
struct frame_tail buftail;
|
|
unsigned long err;
|
|
|
|
/* Also check accessibility of one struct frame_tail beyond */
|
|
if (!access_ok(VERIFY_READ, tail, sizeof(buftail)))
|
|
return NULL;
|
|
|
|
pagefault_disable();
|
|
err = __copy_from_user_inatomic(&buftail, tail, sizeof(buftail));
|
|
pagefault_enable();
|
|
|
|
if (err)
|
|
return NULL;
|
|
|
|
perf_callchain_store(entry, buftail.lr);
|
|
|
|
/*
|
|
* Frame pointers should strictly progress back up the stack
|
|
* (towards higher addresses).
|
|
*/
|
|
if (tail >= buftail.fp)
|
|
return NULL;
|
|
|
|
return buftail.fp;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
/*
|
|
* The registers we're interested in are at the end of the variable
|
|
* length saved register structure. The fp points at the end of this
|
|
* structure so the address of this struct is:
|
|
* (struct compat_frame_tail *)(xxx->fp)-1
|
|
*
|
|
* This code has been adapted from the ARM OProfile support.
|
|
*/
|
|
struct compat_frame_tail {
|
|
compat_uptr_t fp; /* a (struct compat_frame_tail *) in compat mode */
|
|
u32 sp;
|
|
u32 lr;
|
|
} __attribute__((packed));
|
|
|
|
static struct compat_frame_tail __user *
|
|
compat_user_backtrace(struct compat_frame_tail __user *tail,
|
|
struct perf_callchain_entry *entry)
|
|
{
|
|
struct compat_frame_tail buftail;
|
|
unsigned long err;
|
|
|
|
/* Also check accessibility of one struct frame_tail beyond */
|
|
if (!access_ok(VERIFY_READ, tail, sizeof(buftail)))
|
|
return NULL;
|
|
|
|
pagefault_disable();
|
|
err = __copy_from_user_inatomic(&buftail, tail, sizeof(buftail));
|
|
pagefault_enable();
|
|
|
|
if (err)
|
|
return NULL;
|
|
|
|
perf_callchain_store(entry, buftail.lr);
|
|
|
|
/*
|
|
* Frame pointers should strictly progress back up the stack
|
|
* (towards higher addresses).
|
|
*/
|
|
if (tail + 1 >= (struct compat_frame_tail __user *)
|
|
compat_ptr(buftail.fp))
|
|
return NULL;
|
|
|
|
return (struct compat_frame_tail __user *)compat_ptr(buftail.fp) - 1;
|
|
}
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
void perf_callchain_user(struct perf_callchain_entry *entry,
|
|
struct pt_regs *regs)
|
|
{
|
|
if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
|
|
/* We don't support guest os callchain now */
|
|
return;
|
|
}
|
|
|
|
perf_callchain_store(entry, regs->pc);
|
|
|
|
if (!compat_user_mode(regs)) {
|
|
/* AARCH64 mode */
|
|
struct frame_tail __user *tail;
|
|
|
|
tail = (struct frame_tail __user *)regs->regs[29];
|
|
|
|
while (entry->nr < PERF_MAX_STACK_DEPTH &&
|
|
tail && !((unsigned long)tail & 0xf))
|
|
tail = user_backtrace(tail, entry);
|
|
} else {
|
|
#ifdef CONFIG_COMPAT
|
|
/* AARCH32 compat mode */
|
|
struct compat_frame_tail __user *tail;
|
|
|
|
tail = (struct compat_frame_tail __user *)regs->compat_fp - 1;
|
|
|
|
while ((entry->nr < PERF_MAX_STACK_DEPTH) &&
|
|
tail && !((unsigned long)tail & 0x3))
|
|
tail = compat_user_backtrace(tail, entry);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Gets called by walk_stackframe() for every stackframe. This will be called
|
|
* whist unwinding the stackframe and is like a subroutine return so we use
|
|
* the PC.
|
|
*/
|
|
static int callchain_trace(struct stackframe *frame, void *data)
|
|
{
|
|
struct perf_callchain_entry *entry = data;
|
|
perf_callchain_store(entry, frame->pc);
|
|
return 0;
|
|
}
|
|
|
|
void perf_callchain_kernel(struct perf_callchain_entry *entry,
|
|
struct pt_regs *regs)
|
|
{
|
|
struct stackframe frame;
|
|
|
|
if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
|
|
/* We don't support guest os callchain now */
|
|
return;
|
|
}
|
|
|
|
frame.fp = regs->regs[29];
|
|
frame.sp = regs->sp;
|
|
frame.pc = regs->pc;
|
|
|
|
walk_stackframe(&frame, callchain_trace, entry);
|
|
}
|
|
|
|
unsigned long perf_instruction_pointer(struct pt_regs *regs)
|
|
{
|
|
if (perf_guest_cbs && perf_guest_cbs->is_in_guest())
|
|
return perf_guest_cbs->get_guest_ip();
|
|
|
|
return instruction_pointer(regs);
|
|
}
|
|
|
|
unsigned long perf_misc_flags(struct pt_regs *regs)
|
|
{
|
|
int misc = 0;
|
|
|
|
if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
|
|
if (perf_guest_cbs->is_user_mode())
|
|
misc |= PERF_RECORD_MISC_GUEST_USER;
|
|
else
|
|
misc |= PERF_RECORD_MISC_GUEST_KERNEL;
|
|
} else {
|
|
if (user_mode(regs))
|
|
misc |= PERF_RECORD_MISC_USER;
|
|
else
|
|
misc |= PERF_RECORD_MISC_KERNEL;
|
|
}
|
|
|
|
return misc;
|
|
}
|