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drm/i915/pmu: Check if pmu is closed before stopping event

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When the driver unbinds, pmu is unregistered and i915->uabi_engines is
set to RB_ROOT. Due to this, when i915 PMU tries to stop the engine
events, it issues a warn_on because engine lookup fails.

All perf hooks are taking care of this using a pmu->closed flag that is
set when PMU unregisters. The stop event seems to have been left out.

Check for pmu->closed in pmu_event_stop as well.

Based on discussion here -
https://patchwork.freedesktop.org/patch/492079/?series=105790&rev=2

v2: s/is/if/ in commit title
v3: Add fixes tag and cc stable

Cc: <stable@vger.kernel.org> # v5.11+
Fixes: b00bccb3f0 ("drm/i915/pmu: Handle PCI unbind")
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231020152441.3764850-1-umesh.nerlige.ramappa@intel.com
(cherry picked from commit 31f6a06f0c)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Umesh Nerlige Ramappa 2023-10-20 08:24:41 -07:00 committed by Rodrigo Vivi
parent 78cc55e0b6
commit 4cbed7702e
1 changed files with 9 additions and 0 deletions
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9
drivers/gpu/drm/i915/i915_pmu.c
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@ -832,9 +832,18 @@ static void i915_pmu_event_start(struct perf_event *event, int flags)
static void i915_pmu_event_stop(struct perf_event *event, int flags)
{
struct drm_i915_private *i915 =
container_of(event->pmu, typeof(*i915), pmu.base);
struct i915_pmu *pmu = &i915->pmu;
if (pmu->closed)
goto out;
if (flags & PERF_EF_UPDATE)
i915_pmu_event_read(event);
i915_pmu_disable(event);
out:
event->hw.state = PERF_HES_STOPPED;
}