openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

drm/i915/pmu: Correct the rc6 offset upon enabling 

The rc6 residency starts ticking from 0 from BIOS POST, but the kernel
starts measuring the time from its boot. If we start measuruing
I915_PMU_RC6_RESIDENCY while the GT is idle, we start our sampling from
0 and then upon first activity (park/unpark) add in all the rc6
residency since boot. After the first park with the sampler engaged, the
sleep/active counters are aligned.

v2: With a wakeref to be sure

Closes: https://gitlab.freedesktop.org/drm/intel/issues/973
Fixes: df6a420535 ("drm/i915/pmu: Ensure monotonic rc6")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200114105648.2172026-1-chris@chris-wilson.co.uk
(cherry picked from commit f4e9894b69)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Chris Wilson 2020-01-14 10:56:47 +00:00 committed by Jani Nikula
parent c2cebbc4a5
commit 88a9c66d99
1 changed files with 12 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/gpu/drm/i915/i915_pmu.c
View File

@ -637,8 +637,10 @@ 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);
/*
@ -648,6 +650,14 @@ static void i915_pmu_enable(struct perf_event *event)
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]++;
@ -688,6 +698,8 @@ 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)