On 22/07/2024 22:06, Lucas De Marchi wrote:
There's no need to free the resources during unbind. Since perf events
may still access them due to open events, it's safer to free them when
dropping the last i915 reference.
Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_pmu.c | 21 ++++++++++++++++-----
1 file changed, 16 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index b5d14dd318e4..8708f905f4f4 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -5,6 +5,7 @@
*/
#include <linux/pm_runtime.h>
+#include <drm/drm_managed.h>
#include "gt/intel_engine.h"
#include "gt/intel_engine_pm.h"
@@ -1152,6 +1153,17 @@ static void free_event_attributes(struct i915_pmu *pmu)
pmu->pmu_attr = NULL;
}
+static void free_pmu(struct drm_device *dev, void *res)
+{
+ struct i915_pmu *pmu = res;
+ struct drm_i915_private *i915 = pmu_to_i915(pmu);
+
+ free_event_attributes(pmu);
+ kfree(pmu->base.attr_groups);
+ if (IS_DGFX(i915))
+ kfree(pmu->name);
+}
+
static int i915_pmu_cpu_online(unsigned int cpu, struct hlist_node *node)
{
struct i915_pmu *pmu = hlist_entry_safe(node, typeof(*pmu), cpuhp.node);
@@ -1302,6 +1314,9 @@ void i915_pmu_register(struct drm_i915_private *i915)
if (ret)
goto err_unreg;
+ if (drmm_add_action_or_reset(&i915->drm, free_pmu, pmu))
+ goto err_unreg;
Is i915_pmu_unregister_cpuhp_state missing on this error path?
Regards,
Tvrtko
+
return;
err_unreg:
@@ -1336,11 +1351,7 @@ void i915_pmu_unregister(struct drm_i915_private *i915)
hrtimer_cancel(&pmu->timer);
i915_pmu_unregister_cpuhp_state(pmu);
-
perf_pmu_unregister(&pmu->base);
+
pmu->base.event_init = NULL;
- kfree(pmu->base.attr_groups);
- if (IS_DGFX(i915))
- kfree(pmu->name);
- free_event_attributes(pmu);
}
