As the GT may be running in parallel with the module initialisation code, we may enter i915_pmu_gt_parked() as we are executing i915_pmu_register(). We have to init the spinlock before we mark pmu.event_init so that it is available for use by i915_pmu_gt_parked() (which may run as soon as event_init is set).
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=112127 Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursu...@intel.com> --- drivers/gpu/drm/i915/i915_pmu.c | 37 +++++++++++++++++---------------- 1 file changed, 19 insertions(+), 18 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c index 85912917c062..b5b67c0624ff 100644 --- a/drivers/gpu/drm/i915/i915_pmu.c +++ b/drivers/gpu/drm/i915/i915_pmu.c @@ -1101,20 +1101,6 @@ void i915_pmu_register(struct drm_i915_private *i915) return; } - i915_pmu_events_attr_group.attrs = create_event_attributes(pmu); - if (!i915_pmu_events_attr_group.attrs) - goto err; - - pmu->base.attr_groups = i915_pmu_attr_groups; - pmu->base.task_ctx_nr = perf_invalid_context; - pmu->base.event_init = i915_pmu_event_init; - pmu->base.add = i915_pmu_event_add; - pmu->base.del = i915_pmu_event_del; - pmu->base.start = i915_pmu_event_start; - pmu->base.stop = i915_pmu_event_stop; - pmu->base.read = i915_pmu_event_read; - pmu->base.event_idx = i915_pmu_event_event_idx; - spin_lock_init(&pmu->lock); hrtimer_init(&pmu->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); pmu->timer.function = i915_sample; @@ -1128,9 +1114,23 @@ void i915_pmu_register(struct drm_i915_private *i915) if (!pmu->name) goto err; + i915_pmu_events_attr_group.attrs = create_event_attributes(pmu); + if (!i915_pmu_events_attr_group.attrs) + goto err_name; + + pmu->base.attr_groups = i915_pmu_attr_groups; + pmu->base.task_ctx_nr = perf_invalid_context; + pmu->base.event_init = i915_pmu_event_init; + pmu->base.add = i915_pmu_event_add; + pmu->base.del = i915_pmu_event_del; + pmu->base.start = i915_pmu_event_start; + pmu->base.stop = i915_pmu_event_stop; + pmu->base.read = i915_pmu_event_read; + pmu->base.event_idx = i915_pmu_event_event_idx; + ret = perf_pmu_register(&pmu->base, pmu->name, -1); if (ret) - goto err_name; + goto err_attr; ret = i915_pmu_register_cpuhp_state(pmu); if (ret) @@ -1140,13 +1140,14 @@ void i915_pmu_register(struct drm_i915_private *i915) err_unreg: perf_pmu_unregister(&pmu->base); +err_attr: + pmu->base.event_init = NULL; + free_event_attributes(pmu); err_name: if (!is_igp(i915)) kfree(pmu->name); err: - pmu->base.event_init = NULL; - free_event_attributes(pmu); - DRM_NOTE("Failed to register PMU! (err=%d)\n", ret); + dev_notice(i915->drm.dev, "Failed to register PMU!\n"); } void i915_pmu_unregister(struct drm_i915_private *i915) -- 2.24.0.rc1 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
