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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2017-10-06 11:40:38 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2017-10-06 17:49:46 +0100 |
| commit | 7c26240e8a19240924b029215989f28995f16d8c (patch) | |
| tree | f16c43f466b110831a435c0ed61a7c1a93892328 | |
| parent | bb8920f5bea53317c15d1c14f2704f2deaeb9ffd (diff) | |
| download | linux-7c26240e8a19240924b029215989f28995f16d8c.tar.bz2 | |
drm/i915: Try harder to finish the idle-worker
If a worker requeues itself, it may switch to a different kworker pool,
which flush_work() considers as complete. To be strict, we then need to
keep flushing the work until it is no longer pending.
References: https://bugs.freedesktop.org/show_bug.cgi?id=102456
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171006104038.22337-1-chris@chris-wilson.co.uk
| -rw-r--r-- | drivers/gpu/drm/i915/i915_debugfs.c | 3 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem.c | 3 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_utils.h | 13 |
3 files changed, 15 insertions, 4 deletions
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 44aae25d12c7..84ab77c02d3e 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -4259,8 +4259,7 @@ fault_irq_set(struct drm_i915_private *i915, mutex_unlock(&i915->drm.struct_mutex); /* Flush idle worker to disarm irq */ - while (flush_delayed_work(&i915->gt.idle_work)) - ; + drain_delayed_work(&i915->gt.idle_work); return 0; diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index ab8c6946fea4..c48700f7bc6e 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -4547,8 +4547,7 @@ int i915_gem_suspend(struct drm_i915_private *dev_priv) /* As the idle_work is rearming if it detects a race, play safe and * repeat the flush until it is definitely idle. */ - while (flush_delayed_work(&dev_priv->gt.idle_work)) - ; + drain_delayed_work(&dev_priv->gt.idle_work); /* Assert that we sucessfully flushed all the work and * reset the GPU back to its idle, low power state. diff --git a/drivers/gpu/drm/i915/i915_utils.h b/drivers/gpu/drm/i915/i915_utils.h index c242327d5217..af3d7cc53fa1 100644 --- a/drivers/gpu/drm/i915/i915_utils.h +++ b/drivers/gpu/drm/i915/i915_utils.h @@ -124,4 +124,17 @@ static inline void __list_del_many(struct list_head *head, WRITE_ONCE(head->next, first); } +/* + * Wait until the work is finally complete, even if it tries to postpone + * by requeueing itself. Note, that if the worker never cancels itself, + * we will spin forever. + */ +static inline void drain_delayed_work(struct delayed_work *dw) +{ + do { + while (flush_delayed_work(dw)) + ; + } while (delayed_work_pending(dw)); +} + #endif /* !__I915_UTILS_H */ |