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54a9adc460
Conditional spinlocks make it hard for gcc and for lockdep to follow the code flow. This one causes a warning with at least gcc-9 and higher: In file included from include/linux/irq.h:14, from drivers/gpu/drm/i915/i915_pmu.c:7: drivers/gpu/drm/i915/i915_pmu.c: In function 'i915_sample': include/linux/spinlock.h:289:3: error: 'flags' may be used uninitialized in this function [-Werror=maybe-uninitialized] 289 | _raw_spin_unlock_irqrestore(lock, flags); \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/i915/i915_pmu.c:288:17: note: 'flags' was declared here 288 | unsigned long flags; | ^~~~~ Split out the part between the locks into a separate function for readability and to let the compiler figure out what the logic actually is. Fixes:d79e1bd676
("drm/i915/pmu: Only use exclusive mmio access for gen7") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20200527140526.1458215-1-arnd@arndb.de (cherry picked from commit6ec81b8273
) Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
1177 lines
28 KiB
C
1177 lines
28 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright © 2017-2018 Intel Corporation
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*/
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#include <linux/irq.h>
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#include <linux/pm_runtime.h>
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#include "gt/intel_engine.h"
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#include "gt/intel_engine_pm.h"
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#include "gt/intel_engine_user.h"
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#include "gt/intel_gt_pm.h"
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#include "gt/intel_rc6.h"
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#include "gt/intel_rps.h"
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#include "i915_drv.h"
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#include "i915_pmu.h"
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#include "intel_pm.h"
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/* Frequency for the sampling timer for events which need it. */
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#define FREQUENCY 200
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#define PERIOD max_t(u64, 10000, NSEC_PER_SEC / FREQUENCY)
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#define ENGINE_SAMPLE_MASK \
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(BIT(I915_SAMPLE_BUSY) | \
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BIT(I915_SAMPLE_WAIT) | \
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BIT(I915_SAMPLE_SEMA))
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#define ENGINE_SAMPLE_BITS (1 << I915_PMU_SAMPLE_BITS)
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static cpumask_t i915_pmu_cpumask;
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static u8 engine_config_sample(u64 config)
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{
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return config & I915_PMU_SAMPLE_MASK;
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}
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static u8 engine_event_sample(struct perf_event *event)
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{
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return engine_config_sample(event->attr.config);
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}
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static u8 engine_event_class(struct perf_event *event)
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{
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return (event->attr.config >> I915_PMU_CLASS_SHIFT) & 0xff;
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}
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static u8 engine_event_instance(struct perf_event *event)
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{
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return (event->attr.config >> I915_PMU_SAMPLE_BITS) & 0xff;
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}
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static bool is_engine_config(u64 config)
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{
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return config < __I915_PMU_OTHER(0);
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}
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static unsigned int config_enabled_bit(u64 config)
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{
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if (is_engine_config(config))
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return engine_config_sample(config);
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else
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return ENGINE_SAMPLE_BITS + (config - __I915_PMU_OTHER(0));
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}
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static u64 config_enabled_mask(u64 config)
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{
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return BIT_ULL(config_enabled_bit(config));
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}
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static bool is_engine_event(struct perf_event *event)
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{
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return is_engine_config(event->attr.config);
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}
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static unsigned int event_enabled_bit(struct perf_event *event)
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{
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return config_enabled_bit(event->attr.config);
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}
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static bool pmu_needs_timer(struct i915_pmu *pmu, bool gpu_active)
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{
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struct drm_i915_private *i915 = container_of(pmu, typeof(*i915), pmu);
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u64 enable;
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/*
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* Only some counters need the sampling timer.
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*
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* We start with a bitmask of all currently enabled events.
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*/
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enable = pmu->enable;
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/*
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* Mask out all the ones which do not need the timer, or in
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* other words keep all the ones that could need the timer.
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*/
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enable &= config_enabled_mask(I915_PMU_ACTUAL_FREQUENCY) |
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config_enabled_mask(I915_PMU_REQUESTED_FREQUENCY) |
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ENGINE_SAMPLE_MASK;
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/*
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* When the GPU is idle per-engine counters do not need to be
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* running so clear those bits out.
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*/
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if (!gpu_active)
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enable &= ~ENGINE_SAMPLE_MASK;
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/*
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* Also there is software busyness tracking available we do not
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* need the timer for I915_SAMPLE_BUSY counter.
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*/
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else if (i915->caps.scheduler & I915_SCHEDULER_CAP_ENGINE_BUSY_STATS)
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enable &= ~BIT(I915_SAMPLE_BUSY);
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/*
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* If some bits remain it means we need the sampling timer running.
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*/
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return enable;
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}
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static u64 __get_rc6(struct intel_gt *gt)
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{
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struct drm_i915_private *i915 = gt->i915;
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u64 val;
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val = intel_rc6_residency_ns(>->rc6,
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IS_VALLEYVIEW(i915) ?
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VLV_GT_RENDER_RC6 :
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GEN6_GT_GFX_RC6);
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if (HAS_RC6p(i915))
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val += intel_rc6_residency_ns(>->rc6, GEN6_GT_GFX_RC6p);
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if (HAS_RC6pp(i915))
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val += intel_rc6_residency_ns(>->rc6, GEN6_GT_GFX_RC6pp);
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return val;
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}
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#if IS_ENABLED(CONFIG_PM)
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static inline s64 ktime_since(const ktime_t kt)
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{
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return ktime_to_ns(ktime_sub(ktime_get(), kt));
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}
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static u64 get_rc6(struct intel_gt *gt)
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{
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struct drm_i915_private *i915 = gt->i915;
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struct i915_pmu *pmu = &i915->pmu;
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unsigned long flags;
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bool awake = false;
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u64 val;
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if (intel_gt_pm_get_if_awake(gt)) {
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val = __get_rc6(gt);
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intel_gt_pm_put_async(gt);
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awake = true;
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}
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spin_lock_irqsave(&pmu->lock, flags);
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if (awake) {
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pmu->sample[__I915_SAMPLE_RC6].cur = val;
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} else {
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/*
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* We think we are runtime suspended.
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*
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* Report the delta from when the device was suspended to now,
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* on top of the last known real value, as the approximated RC6
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* counter value.
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*/
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val = ktime_since(pmu->sleep_last);
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val += pmu->sample[__I915_SAMPLE_RC6].cur;
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}
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if (val < pmu->sample[__I915_SAMPLE_RC6_LAST_REPORTED].cur)
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val = pmu->sample[__I915_SAMPLE_RC6_LAST_REPORTED].cur;
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else
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pmu->sample[__I915_SAMPLE_RC6_LAST_REPORTED].cur = val;
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spin_unlock_irqrestore(&pmu->lock, flags);
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return val;
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}
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static void park_rc6(struct drm_i915_private *i915)
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{
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struct i915_pmu *pmu = &i915->pmu;
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if (pmu->enable & config_enabled_mask(I915_PMU_RC6_RESIDENCY))
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pmu->sample[__I915_SAMPLE_RC6].cur = __get_rc6(&i915->gt);
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pmu->sleep_last = ktime_get();
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}
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#else
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static u64 get_rc6(struct intel_gt *gt)
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{
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return __get_rc6(gt);
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}
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static void park_rc6(struct drm_i915_private *i915) {}
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#endif
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static void __i915_pmu_maybe_start_timer(struct i915_pmu *pmu)
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{
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if (!pmu->timer_enabled && pmu_needs_timer(pmu, true)) {
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pmu->timer_enabled = true;
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pmu->timer_last = ktime_get();
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hrtimer_start_range_ns(&pmu->timer,
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ns_to_ktime(PERIOD), 0,
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HRTIMER_MODE_REL_PINNED);
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}
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}
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void i915_pmu_gt_parked(struct drm_i915_private *i915)
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{
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struct i915_pmu *pmu = &i915->pmu;
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if (!pmu->base.event_init)
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return;
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spin_lock_irq(&pmu->lock);
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park_rc6(i915);
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/*
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* Signal sampling timer to stop if only engine events are enabled and
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* GPU went idle.
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*/
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pmu->timer_enabled = pmu_needs_timer(pmu, false);
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spin_unlock_irq(&pmu->lock);
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}
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void i915_pmu_gt_unparked(struct drm_i915_private *i915)
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{
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struct i915_pmu *pmu = &i915->pmu;
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if (!pmu->base.event_init)
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return;
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spin_lock_irq(&pmu->lock);
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/*
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* Re-enable sampling timer when GPU goes active.
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*/
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__i915_pmu_maybe_start_timer(pmu);
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spin_unlock_irq(&pmu->lock);
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}
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static void
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add_sample(struct i915_pmu_sample *sample, u32 val)
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{
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sample->cur += val;
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}
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static bool exclusive_mmio_access(const struct drm_i915_private *i915)
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{
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/*
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* We have to avoid concurrent mmio cache line access on gen7 or
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* risk a machine hang. For a fun history lesson dig out the old
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* userspace intel_gpu_top and run it on Ivybridge or Haswell!
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*/
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return IS_GEN(i915, 7);
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}
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static void engine_sample(struct intel_engine_cs *engine, unsigned int period_ns)
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{
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struct intel_engine_pmu *pmu = &engine->pmu;
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bool busy;
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u32 val;
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val = ENGINE_READ_FW(engine, RING_CTL);
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if (val == 0) /* powerwell off => engine idle */
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return;
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if (val & RING_WAIT)
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add_sample(&pmu->sample[I915_SAMPLE_WAIT], period_ns);
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if (val & RING_WAIT_SEMAPHORE)
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add_sample(&pmu->sample[I915_SAMPLE_SEMA], period_ns);
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/* No need to sample when busy stats are supported. */
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if (intel_engine_supports_stats(engine))
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return;
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/*
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* While waiting on a semaphore or event, MI_MODE reports the
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* ring as idle. However, previously using the seqno, and with
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* execlists sampling, we account for the ring waiting as the
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* engine being busy. Therefore, we record the sample as being
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* busy if either waiting or !idle.
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*/
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busy = val & (RING_WAIT_SEMAPHORE | RING_WAIT);
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if (!busy) {
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val = ENGINE_READ_FW(engine, RING_MI_MODE);
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busy = !(val & MODE_IDLE);
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}
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if (busy)
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add_sample(&pmu->sample[I915_SAMPLE_BUSY], period_ns);
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}
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static void
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engines_sample(struct intel_gt *gt, unsigned int period_ns)
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{
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struct drm_i915_private *i915 = gt->i915;
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struct intel_engine_cs *engine;
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enum intel_engine_id id;
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unsigned long flags;
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if ((i915->pmu.enable & ENGINE_SAMPLE_MASK) == 0)
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return;
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if (!intel_gt_pm_is_awake(gt))
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return;
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for_each_engine(engine, gt, id) {
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if (!intel_engine_pm_get_if_awake(engine))
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continue;
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if (exclusive_mmio_access(i915)) {
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spin_lock_irqsave(&engine->uncore->lock, flags);
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engine_sample(engine, period_ns);
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spin_unlock_irqrestore(&engine->uncore->lock, flags);
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} else {
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engine_sample(engine, period_ns);
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}
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intel_engine_pm_put_async(engine);
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}
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}
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static void
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add_sample_mult(struct i915_pmu_sample *sample, u32 val, u32 mul)
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{
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sample->cur += mul_u32_u32(val, mul);
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}
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static bool frequency_sampling_enabled(struct i915_pmu *pmu)
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{
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return pmu->enable &
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(config_enabled_mask(I915_PMU_ACTUAL_FREQUENCY) |
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config_enabled_mask(I915_PMU_REQUESTED_FREQUENCY));
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}
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static void
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frequency_sample(struct intel_gt *gt, unsigned int period_ns)
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{
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struct drm_i915_private *i915 = gt->i915;
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struct intel_uncore *uncore = gt->uncore;
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struct i915_pmu *pmu = &i915->pmu;
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struct intel_rps *rps = >->rps;
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if (!frequency_sampling_enabled(pmu))
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return;
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/* Report 0/0 (actual/requested) frequency while parked. */
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if (!intel_gt_pm_get_if_awake(gt))
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return;
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if (pmu->enable & config_enabled_mask(I915_PMU_ACTUAL_FREQUENCY)) {
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u32 val;
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/*
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* We take a quick peek here without using forcewake
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* so that we don't perturb the system under observation
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* (forcewake => !rc6 => increased power use). We expect
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* that if the read fails because it is outside of the
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* mmio power well, then it will return 0 -- in which
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* case we assume the system is running at the intended
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* frequency. Fortunately, the read should rarely fail!
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*/
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val = intel_uncore_read_fw(uncore, GEN6_RPSTAT1);
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if (val)
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val = intel_rps_get_cagf(rps, val);
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else
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val = rps->cur_freq;
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add_sample_mult(&pmu->sample[__I915_SAMPLE_FREQ_ACT],
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intel_gpu_freq(rps, val), period_ns / 1000);
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}
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if (pmu->enable & config_enabled_mask(I915_PMU_REQUESTED_FREQUENCY)) {
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add_sample_mult(&pmu->sample[__I915_SAMPLE_FREQ_REQ],
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intel_gpu_freq(rps, rps->cur_freq),
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period_ns / 1000);
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}
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intel_gt_pm_put_async(gt);
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}
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static enum hrtimer_restart i915_sample(struct hrtimer *hrtimer)
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{
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struct drm_i915_private *i915 =
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container_of(hrtimer, struct drm_i915_private, pmu.timer);
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struct i915_pmu *pmu = &i915->pmu;
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struct intel_gt *gt = &i915->gt;
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unsigned int period_ns;
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ktime_t now;
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if (!READ_ONCE(pmu->timer_enabled))
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return HRTIMER_NORESTART;
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now = ktime_get();
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period_ns = ktime_to_ns(ktime_sub(now, pmu->timer_last));
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pmu->timer_last = now;
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/*
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* Strictly speaking the passed in period may not be 100% accurate for
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* all internal calculation, since some amount of time can be spent on
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* grabbing the forcewake. However the potential error from timer call-
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* back delay greatly dominates this so we keep it simple.
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*/
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engines_sample(gt, period_ns);
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frequency_sample(gt, period_ns);
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hrtimer_forward(hrtimer, now, ns_to_ktime(PERIOD));
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return HRTIMER_RESTART;
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}
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static u64 count_interrupts(struct drm_i915_private *i915)
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{
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/* open-coded kstat_irqs() */
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struct irq_desc *desc = irq_to_desc(i915->drm.pdev->irq);
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u64 sum = 0;
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int cpu;
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if (!desc || !desc->kstat_irqs)
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return 0;
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for_each_possible_cpu(cpu)
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sum += *per_cpu_ptr(desc->kstat_irqs, cpu);
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return sum;
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}
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static void i915_pmu_event_destroy(struct perf_event *event)
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{
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WARN_ON(event->parent);
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module_put(THIS_MODULE);
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}
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static int
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engine_event_status(struct intel_engine_cs *engine,
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enum drm_i915_pmu_engine_sample sample)
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{
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switch (sample) {
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case I915_SAMPLE_BUSY:
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case I915_SAMPLE_WAIT:
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break;
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case I915_SAMPLE_SEMA:
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if (INTEL_GEN(engine->i915) < 6)
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return -ENODEV;
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break;
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default:
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return -ENOENT;
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}
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return 0;
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}
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static int
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config_status(struct drm_i915_private *i915, u64 config)
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{
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switch (config) {
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case I915_PMU_ACTUAL_FREQUENCY:
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if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915))
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/* Requires a mutex for sampling! */
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return -ENODEV;
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/* Fall-through. */
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case I915_PMU_REQUESTED_FREQUENCY:
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if (INTEL_GEN(i915) < 6)
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return -ENODEV;
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break;
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case I915_PMU_INTERRUPTS:
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break;
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case I915_PMU_RC6_RESIDENCY:
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if (!HAS_RC6(i915))
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return -ENODEV;
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break;
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default:
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return -ENOENT;
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}
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return 0;
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}
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static int engine_event_init(struct perf_event *event)
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{
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struct drm_i915_private *i915 =
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container_of(event->pmu, typeof(*i915), pmu.base);
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struct intel_engine_cs *engine;
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|
|
engine = intel_engine_lookup_user(i915, engine_event_class(event),
|
|
engine_event_instance(event));
|
|
if (!engine)
|
|
return -ENODEV;
|
|
|
|
return engine_event_status(engine, engine_event_sample(event));
|
|
}
|
|
|
|
static int i915_pmu_event_init(struct perf_event *event)
|
|
{
|
|
struct drm_i915_private *i915 =
|
|
container_of(event->pmu, typeof(*i915), pmu.base);
|
|
int ret;
|
|
|
|
if (event->attr.type != event->pmu->type)
|
|
return -ENOENT;
|
|
|
|
/* unsupported modes and filters */
|
|
if (event->attr.sample_period) /* no sampling */
|
|
return -EINVAL;
|
|
|
|
if (has_branch_stack(event))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (event->cpu < 0)
|
|
return -EINVAL;
|
|
|
|
/* only allow running on one cpu at a time */
|
|
if (!cpumask_test_cpu(event->cpu, &i915_pmu_cpumask))
|
|
return -EINVAL;
|
|
|
|
if (is_engine_event(event))
|
|
ret = engine_event_init(event);
|
|
else
|
|
ret = config_status(i915, event->attr.config);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!event->parent) {
|
|
__module_get(THIS_MODULE);
|
|
event->destroy = i915_pmu_event_destroy;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u64 __i915_pmu_event_read(struct perf_event *event)
|
|
{
|
|
struct drm_i915_private *i915 =
|
|
container_of(event->pmu, typeof(*i915), pmu.base);
|
|
struct i915_pmu *pmu = &i915->pmu;
|
|
u64 val = 0;
|
|
|
|
if (is_engine_event(event)) {
|
|
u8 sample = engine_event_sample(event);
|
|
struct intel_engine_cs *engine;
|
|
|
|
engine = intel_engine_lookup_user(i915,
|
|
engine_event_class(event),
|
|
engine_event_instance(event));
|
|
|
|
if (drm_WARN_ON_ONCE(&i915->drm, !engine)) {
|
|
/* Do nothing */
|
|
} else if (sample == I915_SAMPLE_BUSY &&
|
|
intel_engine_supports_stats(engine)) {
|
|
val = ktime_to_ns(intel_engine_get_busy_time(engine));
|
|
} else {
|
|
val = engine->pmu.sample[sample].cur;
|
|
}
|
|
} else {
|
|
switch (event->attr.config) {
|
|
case I915_PMU_ACTUAL_FREQUENCY:
|
|
val =
|
|
div_u64(pmu->sample[__I915_SAMPLE_FREQ_ACT].cur,
|
|
USEC_PER_SEC /* to MHz */);
|
|
break;
|
|
case I915_PMU_REQUESTED_FREQUENCY:
|
|
val =
|
|
div_u64(pmu->sample[__I915_SAMPLE_FREQ_REQ].cur,
|
|
USEC_PER_SEC /* to MHz */);
|
|
break;
|
|
case I915_PMU_INTERRUPTS:
|
|
val = count_interrupts(i915);
|
|
break;
|
|
case I915_PMU_RC6_RESIDENCY:
|
|
val = get_rc6(&i915->gt);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return val;
|
|
}
|
|
|
|
static void i915_pmu_event_read(struct perf_event *event)
|
|
{
|
|
struct hw_perf_event *hwc = &event->hw;
|
|
u64 prev, new;
|
|
|
|
again:
|
|
prev = local64_read(&hwc->prev_count);
|
|
new = __i915_pmu_event_read(event);
|
|
|
|
if (local64_cmpxchg(&hwc->prev_count, prev, new) != prev)
|
|
goto again;
|
|
|
|
local64_add(new - prev, &event->count);
|
|
}
|
|
|
|
static void i915_pmu_enable(struct perf_event *event)
|
|
{
|
|
struct drm_i915_private *i915 =
|
|
container_of(event->pmu, typeof(*i915), pmu.base);
|
|
unsigned int bit = event_enabled_bit(event);
|
|
struct i915_pmu *pmu = &i915->pmu;
|
|
intel_wakeref_t wakeref;
|
|
unsigned long flags;
|
|
|
|
wakeref = intel_runtime_pm_get(&i915->runtime_pm);
|
|
spin_lock_irqsave(&pmu->lock, flags);
|
|
|
|
/*
|
|
* Update the bitmask of enabled events and increment
|
|
* the event reference counter.
|
|
*/
|
|
BUILD_BUG_ON(ARRAY_SIZE(pmu->enable_count) != I915_PMU_MASK_BITS);
|
|
GEM_BUG_ON(bit >= ARRAY_SIZE(pmu->enable_count));
|
|
GEM_BUG_ON(pmu->enable_count[bit] == ~0);
|
|
|
|
if (pmu->enable_count[bit] == 0 &&
|
|
config_enabled_mask(I915_PMU_RC6_RESIDENCY) & BIT_ULL(bit)) {
|
|
pmu->sample[__I915_SAMPLE_RC6_LAST_REPORTED].cur = 0;
|
|
pmu->sample[__I915_SAMPLE_RC6].cur = __get_rc6(&i915->gt);
|
|
pmu->sleep_last = ktime_get();
|
|
}
|
|
|
|
pmu->enable |= BIT_ULL(bit);
|
|
pmu->enable_count[bit]++;
|
|
|
|
/*
|
|
* Start the sampling timer if needed and not already enabled.
|
|
*/
|
|
__i915_pmu_maybe_start_timer(pmu);
|
|
|
|
/*
|
|
* For per-engine events the bitmask and reference counting
|
|
* is stored per engine.
|
|
*/
|
|
if (is_engine_event(event)) {
|
|
u8 sample = engine_event_sample(event);
|
|
struct intel_engine_cs *engine;
|
|
|
|
engine = intel_engine_lookup_user(i915,
|
|
engine_event_class(event),
|
|
engine_event_instance(event));
|
|
|
|
BUILD_BUG_ON(ARRAY_SIZE(engine->pmu.enable_count) !=
|
|
I915_ENGINE_SAMPLE_COUNT);
|
|
BUILD_BUG_ON(ARRAY_SIZE(engine->pmu.sample) !=
|
|
I915_ENGINE_SAMPLE_COUNT);
|
|
GEM_BUG_ON(sample >= ARRAY_SIZE(engine->pmu.enable_count));
|
|
GEM_BUG_ON(sample >= ARRAY_SIZE(engine->pmu.sample));
|
|
GEM_BUG_ON(engine->pmu.enable_count[sample] == ~0);
|
|
|
|
engine->pmu.enable |= BIT(sample);
|
|
engine->pmu.enable_count[sample]++;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&pmu->lock, flags);
|
|
|
|
/*
|
|
* Store the current counter value so we can report the correct delta
|
|
* for all listeners. Even when the event was already enabled and has
|
|
* an existing non-zero value.
|
|
*/
|
|
local64_set(&event->hw.prev_count, __i915_pmu_event_read(event));
|
|
|
|
intel_runtime_pm_put(&i915->runtime_pm, wakeref);
|
|
}
|
|
|
|
static void i915_pmu_disable(struct perf_event *event)
|
|
{
|
|
struct drm_i915_private *i915 =
|
|
container_of(event->pmu, typeof(*i915), pmu.base);
|
|
unsigned int bit = event_enabled_bit(event);
|
|
struct i915_pmu *pmu = &i915->pmu;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&pmu->lock, flags);
|
|
|
|
if (is_engine_event(event)) {
|
|
u8 sample = engine_event_sample(event);
|
|
struct intel_engine_cs *engine;
|
|
|
|
engine = intel_engine_lookup_user(i915,
|
|
engine_event_class(event),
|
|
engine_event_instance(event));
|
|
|
|
GEM_BUG_ON(sample >= ARRAY_SIZE(engine->pmu.enable_count));
|
|
GEM_BUG_ON(sample >= ARRAY_SIZE(engine->pmu.sample));
|
|
GEM_BUG_ON(engine->pmu.enable_count[sample] == 0);
|
|
|
|
/*
|
|
* Decrement the reference count and clear the enabled
|
|
* bitmask when the last listener on an event goes away.
|
|
*/
|
|
if (--engine->pmu.enable_count[sample] == 0)
|
|
engine->pmu.enable &= ~BIT(sample);
|
|
}
|
|
|
|
GEM_BUG_ON(bit >= ARRAY_SIZE(pmu->enable_count));
|
|
GEM_BUG_ON(pmu->enable_count[bit] == 0);
|
|
/*
|
|
* Decrement the reference count and clear the enabled
|
|
* bitmask when the last listener on an event goes away.
|
|
*/
|
|
if (--pmu->enable_count[bit] == 0) {
|
|
pmu->enable &= ~BIT_ULL(bit);
|
|
pmu->timer_enabled &= pmu_needs_timer(pmu, true);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&pmu->lock, flags);
|
|
}
|
|
|
|
static void i915_pmu_event_start(struct perf_event *event, int flags)
|
|
{
|
|
i915_pmu_enable(event);
|
|
event->hw.state = 0;
|
|
}
|
|
|
|
static void i915_pmu_event_stop(struct perf_event *event, int flags)
|
|
{
|
|
if (flags & PERF_EF_UPDATE)
|
|
i915_pmu_event_read(event);
|
|
i915_pmu_disable(event);
|
|
event->hw.state = PERF_HES_STOPPED;
|
|
}
|
|
|
|
static int i915_pmu_event_add(struct perf_event *event, int flags)
|
|
{
|
|
if (flags & PERF_EF_START)
|
|
i915_pmu_event_start(event, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void i915_pmu_event_del(struct perf_event *event, int flags)
|
|
{
|
|
i915_pmu_event_stop(event, PERF_EF_UPDATE);
|
|
}
|
|
|
|
static int i915_pmu_event_event_idx(struct perf_event *event)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
struct i915_str_attribute {
|
|
struct device_attribute attr;
|
|
const char *str;
|
|
};
|
|
|
|
static ssize_t i915_pmu_format_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct i915_str_attribute *eattr;
|
|
|
|
eattr = container_of(attr, struct i915_str_attribute, attr);
|
|
return sprintf(buf, "%s\n", eattr->str);
|
|
}
|
|
|
|
#define I915_PMU_FORMAT_ATTR(_name, _config) \
|
|
(&((struct i915_str_attribute[]) { \
|
|
{ .attr = __ATTR(_name, 0444, i915_pmu_format_show, NULL), \
|
|
.str = _config, } \
|
|
})[0].attr.attr)
|
|
|
|
static struct attribute *i915_pmu_format_attrs[] = {
|
|
I915_PMU_FORMAT_ATTR(i915_eventid, "config:0-20"),
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group i915_pmu_format_attr_group = {
|
|
.name = "format",
|
|
.attrs = i915_pmu_format_attrs,
|
|
};
|
|
|
|
struct i915_ext_attribute {
|
|
struct device_attribute attr;
|
|
unsigned long val;
|
|
};
|
|
|
|
static ssize_t i915_pmu_event_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct i915_ext_attribute *eattr;
|
|
|
|
eattr = container_of(attr, struct i915_ext_attribute, attr);
|
|
return sprintf(buf, "config=0x%lx\n", eattr->val);
|
|
}
|
|
|
|
static ssize_t
|
|
i915_pmu_get_attr_cpumask(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return cpumap_print_to_pagebuf(true, buf, &i915_pmu_cpumask);
|
|
}
|
|
|
|
static DEVICE_ATTR(cpumask, 0444, i915_pmu_get_attr_cpumask, NULL);
|
|
|
|
static struct attribute *i915_cpumask_attrs[] = {
|
|
&dev_attr_cpumask.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group i915_pmu_cpumask_attr_group = {
|
|
.attrs = i915_cpumask_attrs,
|
|
};
|
|
|
|
#define __event(__config, __name, __unit) \
|
|
{ \
|
|
.config = (__config), \
|
|
.name = (__name), \
|
|
.unit = (__unit), \
|
|
}
|
|
|
|
#define __engine_event(__sample, __name) \
|
|
{ \
|
|
.sample = (__sample), \
|
|
.name = (__name), \
|
|
}
|
|
|
|
static struct i915_ext_attribute *
|
|
add_i915_attr(struct i915_ext_attribute *attr, const char *name, u64 config)
|
|
{
|
|
sysfs_attr_init(&attr->attr.attr);
|
|
attr->attr.attr.name = name;
|
|
attr->attr.attr.mode = 0444;
|
|
attr->attr.show = i915_pmu_event_show;
|
|
attr->val = config;
|
|
|
|
return ++attr;
|
|
}
|
|
|
|
static struct perf_pmu_events_attr *
|
|
add_pmu_attr(struct perf_pmu_events_attr *attr, const char *name,
|
|
const char *str)
|
|
{
|
|
sysfs_attr_init(&attr->attr.attr);
|
|
attr->attr.attr.name = name;
|
|
attr->attr.attr.mode = 0444;
|
|
attr->attr.show = perf_event_sysfs_show;
|
|
attr->event_str = str;
|
|
|
|
return ++attr;
|
|
}
|
|
|
|
static struct attribute **
|
|
create_event_attributes(struct i915_pmu *pmu)
|
|
{
|
|
struct drm_i915_private *i915 = container_of(pmu, typeof(*i915), pmu);
|
|
static const struct {
|
|
u64 config;
|
|
const char *name;
|
|
const char *unit;
|
|
} events[] = {
|
|
__event(I915_PMU_ACTUAL_FREQUENCY, "actual-frequency", "M"),
|
|
__event(I915_PMU_REQUESTED_FREQUENCY, "requested-frequency", "M"),
|
|
__event(I915_PMU_INTERRUPTS, "interrupts", NULL),
|
|
__event(I915_PMU_RC6_RESIDENCY, "rc6-residency", "ns"),
|
|
};
|
|
static const struct {
|
|
enum drm_i915_pmu_engine_sample sample;
|
|
char *name;
|
|
} engine_events[] = {
|
|
__engine_event(I915_SAMPLE_BUSY, "busy"),
|
|
__engine_event(I915_SAMPLE_SEMA, "sema"),
|
|
__engine_event(I915_SAMPLE_WAIT, "wait"),
|
|
};
|
|
unsigned int count = 0;
|
|
struct perf_pmu_events_attr *pmu_attr = NULL, *pmu_iter;
|
|
struct i915_ext_attribute *i915_attr = NULL, *i915_iter;
|
|
struct attribute **attr = NULL, **attr_iter;
|
|
struct intel_engine_cs *engine;
|
|
unsigned int i;
|
|
|
|
/* Count how many counters we will be exposing. */
|
|
for (i = 0; i < ARRAY_SIZE(events); i++) {
|
|
if (!config_status(i915, events[i].config))
|
|
count++;
|
|
}
|
|
|
|
for_each_uabi_engine(engine, i915) {
|
|
for (i = 0; i < ARRAY_SIZE(engine_events); i++) {
|
|
if (!engine_event_status(engine,
|
|
engine_events[i].sample))
|
|
count++;
|
|
}
|
|
}
|
|
|
|
/* Allocate attribute objects and table. */
|
|
i915_attr = kcalloc(count, sizeof(*i915_attr), GFP_KERNEL);
|
|
if (!i915_attr)
|
|
goto err_alloc;
|
|
|
|
pmu_attr = kcalloc(count, sizeof(*pmu_attr), GFP_KERNEL);
|
|
if (!pmu_attr)
|
|
goto err_alloc;
|
|
|
|
/* Max one pointer of each attribute type plus a termination entry. */
|
|
attr = kcalloc(count * 2 + 1, sizeof(*attr), GFP_KERNEL);
|
|
if (!attr)
|
|
goto err_alloc;
|
|
|
|
i915_iter = i915_attr;
|
|
pmu_iter = pmu_attr;
|
|
attr_iter = attr;
|
|
|
|
/* Initialize supported non-engine counters. */
|
|
for (i = 0; i < ARRAY_SIZE(events); i++) {
|
|
char *str;
|
|
|
|
if (config_status(i915, events[i].config))
|
|
continue;
|
|
|
|
str = kstrdup(events[i].name, GFP_KERNEL);
|
|
if (!str)
|
|
goto err;
|
|
|
|
*attr_iter++ = &i915_iter->attr.attr;
|
|
i915_iter = add_i915_attr(i915_iter, str, events[i].config);
|
|
|
|
if (events[i].unit) {
|
|
str = kasprintf(GFP_KERNEL, "%s.unit", events[i].name);
|
|
if (!str)
|
|
goto err;
|
|
|
|
*attr_iter++ = &pmu_iter->attr.attr;
|
|
pmu_iter = add_pmu_attr(pmu_iter, str, events[i].unit);
|
|
}
|
|
}
|
|
|
|
/* Initialize supported engine counters. */
|
|
for_each_uabi_engine(engine, i915) {
|
|
for (i = 0; i < ARRAY_SIZE(engine_events); i++) {
|
|
char *str;
|
|
|
|
if (engine_event_status(engine,
|
|
engine_events[i].sample))
|
|
continue;
|
|
|
|
str = kasprintf(GFP_KERNEL, "%s-%s",
|
|
engine->name, engine_events[i].name);
|
|
if (!str)
|
|
goto err;
|
|
|
|
*attr_iter++ = &i915_iter->attr.attr;
|
|
i915_iter =
|
|
add_i915_attr(i915_iter, str,
|
|
__I915_PMU_ENGINE(engine->uabi_class,
|
|
engine->uabi_instance,
|
|
engine_events[i].sample));
|
|
|
|
str = kasprintf(GFP_KERNEL, "%s-%s.unit",
|
|
engine->name, engine_events[i].name);
|
|
if (!str)
|
|
goto err;
|
|
|
|
*attr_iter++ = &pmu_iter->attr.attr;
|
|
pmu_iter = add_pmu_attr(pmu_iter, str, "ns");
|
|
}
|
|
}
|
|
|
|
pmu->i915_attr = i915_attr;
|
|
pmu->pmu_attr = pmu_attr;
|
|
|
|
return attr;
|
|
|
|
err:;
|
|
for (attr_iter = attr; *attr_iter; attr_iter++)
|
|
kfree((*attr_iter)->name);
|
|
|
|
err_alloc:
|
|
kfree(attr);
|
|
kfree(i915_attr);
|
|
kfree(pmu_attr);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void free_event_attributes(struct i915_pmu *pmu)
|
|
{
|
|
struct attribute **attr_iter = pmu->events_attr_group.attrs;
|
|
|
|
for (; *attr_iter; attr_iter++)
|
|
kfree((*attr_iter)->name);
|
|
|
|
kfree(pmu->events_attr_group.attrs);
|
|
kfree(pmu->i915_attr);
|
|
kfree(pmu->pmu_attr);
|
|
|
|
pmu->events_attr_group.attrs = NULL;
|
|
pmu->i915_attr = NULL;
|
|
pmu->pmu_attr = NULL;
|
|
}
|
|
|
|
static int i915_pmu_cpu_online(unsigned int cpu, struct hlist_node *node)
|
|
{
|
|
struct i915_pmu *pmu = hlist_entry_safe(node, typeof(*pmu), cpuhp.node);
|
|
|
|
GEM_BUG_ON(!pmu->base.event_init);
|
|
|
|
/* Select the first online CPU as a designated reader. */
|
|
if (!cpumask_weight(&i915_pmu_cpumask))
|
|
cpumask_set_cpu(cpu, &i915_pmu_cpumask);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int i915_pmu_cpu_offline(unsigned int cpu, struct hlist_node *node)
|
|
{
|
|
struct i915_pmu *pmu = hlist_entry_safe(node, typeof(*pmu), cpuhp.node);
|
|
unsigned int target;
|
|
|
|
GEM_BUG_ON(!pmu->base.event_init);
|
|
|
|
if (cpumask_test_and_clear_cpu(cpu, &i915_pmu_cpumask)) {
|
|
target = cpumask_any_but(topology_sibling_cpumask(cpu), cpu);
|
|
/* Migrate events if there is a valid target */
|
|
if (target < nr_cpu_ids) {
|
|
cpumask_set_cpu(target, &i915_pmu_cpumask);
|
|
perf_pmu_migrate_context(&pmu->base, cpu, target);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int i915_pmu_register_cpuhp_state(struct i915_pmu *pmu)
|
|
{
|
|
enum cpuhp_state slot;
|
|
int ret;
|
|
|
|
ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
|
|
"perf/x86/intel/i915:online",
|
|
i915_pmu_cpu_online,
|
|
i915_pmu_cpu_offline);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
slot = ret;
|
|
ret = cpuhp_state_add_instance(slot, &pmu->cpuhp.node);
|
|
if (ret) {
|
|
cpuhp_remove_multi_state(slot);
|
|
return ret;
|
|
}
|
|
|
|
pmu->cpuhp.slot = slot;
|
|
return 0;
|
|
}
|
|
|
|
static void i915_pmu_unregister_cpuhp_state(struct i915_pmu *pmu)
|
|
{
|
|
WARN_ON(pmu->cpuhp.slot == CPUHP_INVALID);
|
|
WARN_ON(cpuhp_state_remove_instance(pmu->cpuhp.slot, &pmu->cpuhp.node));
|
|
cpuhp_remove_multi_state(pmu->cpuhp.slot);
|
|
pmu->cpuhp.slot = CPUHP_INVALID;
|
|
}
|
|
|
|
static bool is_igp(struct drm_i915_private *i915)
|
|
{
|
|
struct pci_dev *pdev = i915->drm.pdev;
|
|
|
|
/* IGP is 0000:00:02.0 */
|
|
return pci_domain_nr(pdev->bus) == 0 &&
|
|
pdev->bus->number == 0 &&
|
|
PCI_SLOT(pdev->devfn) == 2 &&
|
|
PCI_FUNC(pdev->devfn) == 0;
|
|
}
|
|
|
|
void i915_pmu_register(struct drm_i915_private *i915)
|
|
{
|
|
struct i915_pmu *pmu = &i915->pmu;
|
|
const struct attribute_group *attr_groups[] = {
|
|
&i915_pmu_format_attr_group,
|
|
&pmu->events_attr_group,
|
|
&i915_pmu_cpumask_attr_group,
|
|
NULL
|
|
};
|
|
|
|
int ret = -ENOMEM;
|
|
|
|
if (INTEL_GEN(i915) <= 2) {
|
|
drm_info(&i915->drm, "PMU not supported for this GPU.");
|
|
return;
|
|
}
|
|
|
|
spin_lock_init(&pmu->lock);
|
|
hrtimer_init(&pmu->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
|
|
pmu->timer.function = i915_sample;
|
|
pmu->cpuhp.slot = CPUHP_INVALID;
|
|
|
|
if (!is_igp(i915)) {
|
|
pmu->name = kasprintf(GFP_KERNEL,
|
|
"i915_%s",
|
|
dev_name(i915->drm.dev));
|
|
if (pmu->name) {
|
|
/* tools/perf reserves colons as special. */
|
|
strreplace((char *)pmu->name, ':', '_');
|
|
}
|
|
} else {
|
|
pmu->name = "i915";
|
|
}
|
|
if (!pmu->name)
|
|
goto err;
|
|
|
|
pmu->events_attr_group.name = "events";
|
|
pmu->events_attr_group.attrs = create_event_attributes(pmu);
|
|
if (!pmu->events_attr_group.attrs)
|
|
goto err_name;
|
|
|
|
pmu->base.attr_groups = kmemdup(attr_groups, sizeof(attr_groups),
|
|
GFP_KERNEL);
|
|
if (!pmu->base.attr_groups)
|
|
goto err_attr;
|
|
|
|
pmu->base.task_ctx_nr = perf_invalid_context;
|
|
pmu->base.event_init = i915_pmu_event_init;
|
|
pmu->base.add = i915_pmu_event_add;
|
|
pmu->base.del = i915_pmu_event_del;
|
|
pmu->base.start = i915_pmu_event_start;
|
|
pmu->base.stop = i915_pmu_event_stop;
|
|
pmu->base.read = i915_pmu_event_read;
|
|
pmu->base.event_idx = i915_pmu_event_event_idx;
|
|
|
|
ret = perf_pmu_register(&pmu->base, pmu->name, -1);
|
|
if (ret)
|
|
goto err_groups;
|
|
|
|
ret = i915_pmu_register_cpuhp_state(pmu);
|
|
if (ret)
|
|
goto err_unreg;
|
|
|
|
return;
|
|
|
|
err_unreg:
|
|
perf_pmu_unregister(&pmu->base);
|
|
err_groups:
|
|
kfree(pmu->base.attr_groups);
|
|
err_attr:
|
|
pmu->base.event_init = NULL;
|
|
free_event_attributes(pmu);
|
|
err_name:
|
|
if (!is_igp(i915))
|
|
kfree(pmu->name);
|
|
err:
|
|
drm_notice(&i915->drm, "Failed to register PMU!\n");
|
|
}
|
|
|
|
void i915_pmu_unregister(struct drm_i915_private *i915)
|
|
{
|
|
struct i915_pmu *pmu = &i915->pmu;
|
|
|
|
if (!pmu->base.event_init)
|
|
return;
|
|
|
|
drm_WARN_ON(&i915->drm, pmu->enable);
|
|
|
|
hrtimer_cancel(&pmu->timer);
|
|
|
|
i915_pmu_unregister_cpuhp_state(pmu);
|
|
|
|
perf_pmu_unregister(&pmu->base);
|
|
pmu->base.event_init = NULL;
|
|
kfree(pmu->base.attr_groups);
|
|
if (!is_igp(i915))
|
|
kfree(pmu->name);
|
|
free_event_attributes(pmu);
|
|
}
|