On Thu, 19 Oct 2023, Umesh Nerlige Ramappa <umesh.nerlige.ramappa@xxxxxxxxx> wrote: > 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 > > Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@xxxxxxxxx> > --- > drivers/gpu/drm/i915/i915_pmu.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c > index 108b675088ba..f861863eb7c1 100644 > --- a/drivers/gpu/drm/i915/i915_pmu.c > +++ b/drivers/gpu/drm/i915/i915_pmu.c > @@ -831,9 +831,18 @@ 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; This inspired me to write [1]. Please review. BR, Jani. [1] https://patchwork.freedesktop.org/series/125464/ > + > + 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; > } -- Jani Nikula, Intel
