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drm/i915/pmu: Don't grab wakeref when enabling events

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commit 171a8e99828144050015672016dd63494c6d200a upstream.

Chris found a CI report which points out calling intel_runtime_pm_get from
inside i915_pmu_enable hook is not allowed since it can be invoked from
hard irq context. This is something we knew but forgot, so lets fix it
once again.

We do this by syncing the internal book keeping with hardware rc6 counter
on driver load.

v2:
 * Always sync on parking and fully sync on init.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Fixes: f4e9894b6952 ("drm/i915/pmu: Correct the rc6 offset upon enabling")
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20201214094349.3563876-1-tvrtko.ursulin@linux.intel.com
(cherry picked from commit dbe13ae1d6abaab417edf3c37601c6a56594a4cd)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210118100724.465555-1-chris@chris-wilson.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tvrtko Ursulin 2021-01-18 10:07:24 +00:00 committed by Greg Kroah-Hartman
parent 520d05a77b
commit 37ef64511f
1 changed files with 16 additions and 14 deletions
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30
drivers/gpu/drm/i915/i915_pmu.c
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@ -184,13 +184,24 @@ static u64 get_rc6(struct intel_gt *gt)
return val;
}
static void init_rc6(struct i915_pmu *pmu)
{
struct drm_i915_private *i915 = container_of(pmu, typeof(*i915), pmu);
intel_wakeref_t wakeref;
with_intel_runtime_pm(i915->gt.uncore->rpm, wakeref) {
pmu->sample[__I915_SAMPLE_RC6].cur = __get_rc6(&i915->gt);
pmu->sample[__I915_SAMPLE_RC6_LAST_REPORTED].cur =
pmu->sample[__I915_SAMPLE_RC6].cur;
pmu->sleep_last = ktime_get();
}
}
static void park_rc6(struct drm_i915_private *i915)
{
struct i915_pmu *pmu = &i915->pmu;
if (pmu->enable & config_enabled_mask(I915_PMU_RC6_RESIDENCY))
pmu->sample[__I915_SAMPLE_RC6].cur = __get_rc6(&i915->gt);
pmu->sample[__I915_SAMPLE_RC6].cur = __get_rc6(&i915->gt);
pmu->sleep_last = ktime_get();
}
@ -201,6 +212,7 @@ static u64 get_rc6(struct intel_gt *gt)
return __get_rc6(gt);
}
static void init_rc6(struct i915_pmu *pmu) { }
static void park_rc6(struct drm_i915_private *i915) {}
#endif
@ -613,10 +625,8 @@ static void i915_pmu_enable(struct perf_event *event)
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);
/*
@ -627,13 +637,6 @@ static void i915_pmu_enable(struct perf_event *event)
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]++;
@ -674,8 +677,6 @@ static void i915_pmu_enable(struct perf_event *event)
* 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)
@ -1101,6 +1102,7 @@ void i915_pmu_register(struct drm_i915_private *i915)
hrtimer_init(&pmu->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
pmu->timer.function = i915_sample;
pmu->cpuhp.slot = CPUHP_INVALID;
init_rc6(pmu);
if (!is_igp(i915)) {
pmu->name = kasprintf(GFP_KERNEL,