drm/i915/pmu: Handle PCI unbind

Mark the device as closed and keep references to driver data alive to
allow for safe driver unbind with active PMU clients. Perf core does not
otherwise handle this case so we have to do it manually like this.

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/20201020100822.543332-1-tvrtko.ursulin@linux.intel.com

diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index 056994224c6bc4c82f7b2afeab0f6114b72de993..39f584de239b1a0802b5cd412473b12d8371e733 100644 (file)
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -445,6 +445,8 @@ static void i915_pmu_event_destroy(struct perf_event *event)
                container_of(event->pmu, typeof(*i915), pmu.base);
 
        drm_WARN_ON(&i915->drm, event->parent);
+
+       drm_dev_put(&i915->drm);
 }
 
 static int
@@ -510,8 +512,12 @@ static int i915_pmu_event_init(struct perf_event *event)
 {
        struct drm_i915_private *i915 =
                container_of(event->pmu, typeof(*i915), pmu.base);
+       struct i915_pmu *pmu = &i915->pmu;
        int ret;
 
+       if (pmu->closed)
+               return -ENODEV;
+
        if (event->attr.type != event->pmu->type)
                return -ENOENT;
 
@@ -536,8 +542,10 @@ static int i915_pmu_event_init(struct perf_event *event)
        if (ret)
                return ret;
 
-       if (!event->parent)
+       if (!event->parent) {
+               drm_dev_get(&i915->drm);
                event->destroy = i915_pmu_event_destroy;
+       }
 
        return 0;
 }
@@ -594,9 +602,16 @@ static u64 __i915_pmu_event_read(struct perf_event *event)
 
 static void i915_pmu_event_read(struct perf_event *event)
 {
+       struct drm_i915_private *i915 =
+               container_of(event->pmu, typeof(*i915), pmu.base);
        struct hw_perf_event *hwc = &event->hw;
+       struct i915_pmu *pmu = &i915->pmu;
        u64 prev, new;
 
+       if (pmu->closed) {
+               event->hw.state = PERF_HES_STOPPED;
+               return;
+       }
 again:
        prev = local64_read(&hwc->prev_count);
        new = __i915_pmu_event_read(event);
@@ -724,6 +739,13 @@ static void i915_pmu_disable(struct perf_event *event)
 
 static void i915_pmu_event_start(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)
+               return;
+
        i915_pmu_enable(event);
        event->hw.state = 0;
 }
@@ -738,6 +760,13 @@ static void i915_pmu_event_stop(struct perf_event *event, int flags)
 
 static int i915_pmu_event_add(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)
+               return -ENODEV;
+
        if (flags & PERF_EF_START)
                i915_pmu_event_start(event, flags);
 
@@ -1167,7 +1196,13 @@ void i915_pmu_unregister(struct drm_i915_private *i915)
        if (!pmu->base.event_init)
                return;
 
-       drm_WARN_ON(&i915->drm, pmu->enable);
+       /*
+        * "Disconnect" the PMU callbacks - since all are atomic synchronize_rcu
+        * ensures all currently executing ones will have exited before we
+        * proceed with unregistration.
+        */
+       pmu->closed = true;
+       synchronize_rcu();
 
        hrtimer_cancel(&pmu->timer);
 

diff --git a/drivers/gpu/drm/i915/i915_pmu.h b/drivers/gpu/drm/i915/i915_pmu.h
index 941f0c14037ca10dce5066baca711bfdbbef3655..59a0d19afb670aa39f2529bd28b3487440f15c59 100644 (file)
--- a/drivers/gpu/drm/i915/i915_pmu.h
+++ b/drivers/gpu/drm/i915/i915_pmu.h
@@ -49,6 +49,10 @@ struct i915_pmu {
         * @base: PMU base.
         */
        struct pmu base;
+       /**
+        * @closed: i915 is unregistering.
+        */
+       bool closed;
        /**
         * @name: Name as registered with perf core.
         */