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| author | Tvrtko Ursulin <tvrtko.ursulin@intel.com> | 2017-11-21 21:18:50 +0300 |
|---|---|---|
| committer | Tvrtko Ursulin <tvrtko.ursulin@intel.com> | 2017-11-22 14:25:04 +0300 |
| commit | 0cd4684d6ea9a4ffec33fc19de4dd667bb90d0a5 (patch) | |
| tree | 7053d1e21797b716fd25265324ed1ab8c4ef242f /drivers/gpu/drm/i915/i915_pmu.c | |
| parent | b3add01ee217db8e0da8a6596f03c487ed33b06e (diff) | |
| download | linux-0cd4684d6ea9a4ffec33fc19de4dd667bb90d0a5.tar.xz | |
drm/i915/pmu: Add interrupt count metric
For clients like intel-gpu-overlay it is easier to read the
count via the perf API than having to parse /proc.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171121181852.16128-7-tvrtko.ursulin@linux.intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/i915_pmu.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_pmu.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c index 6a428e7218d2..fef389ebf92c 100644 --- a/drivers/gpu/drm/i915/i915_pmu.c +++ b/drivers/gpu/drm/i915/i915_pmu.c @@ -277,6 +277,22 @@ static enum hrtimer_restart i915_sample(struct hrtimer *hrtimer) return HRTIMER_RESTART; } +static u64 count_interrupts(struct drm_i915_private *i915) +{ + /* open-coded kstat_irqs() */ + struct irq_desc *desc = irq_to_desc(i915->drm.pdev->irq); + u64 sum = 0; + int cpu; + + if (!desc || !desc->kstat_irqs) + return 0; + + for_each_possible_cpu(cpu) + sum += *per_cpu_ptr(desc->kstat_irqs, cpu); + + return sum; +} + static void i915_pmu_event_destroy(struct perf_event *event) { WARN_ON(event->parent); @@ -343,6 +359,8 @@ static int i915_pmu_event_init(struct perf_event *event) if (INTEL_GEN(i915) < 6) ret = -ENODEV; break; + case I915_PMU_INTERRUPTS: + break; default: ret = -ENOENT; break; @@ -392,6 +410,9 @@ static u64 __i915_pmu_event_read(struct perf_event *event) div_u64(i915->pmu.sample[__I915_SAMPLE_FREQ_REQ].cur, FREQUENCY); break; + case I915_PMU_INTERRUPTS: + val = count_interrupts(i915); + break; } } @@ -654,6 +675,8 @@ static struct attribute *i915_pmu_events_attrs[] = { I915_EVENT(actual-frequency, I915_PMU_ACTUAL_FREQUENCY, "MHz"), I915_EVENT(requested-frequency, I915_PMU_REQUESTED_FREQUENCY, "MHz"), + I915_EVENT_ATTR(interrupts, I915_PMU_INTERRUPTS), + NULL, }; |