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drm/i915: Wait until the intel_wakeref idle callback is complete 

When waiting for idle, serialise with any ongoing callback so that it
will have completed before completing the wait.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191118230254.2615942-12-chris@chris-wilson.co.uk
(cherry picked from commit f4ba0707c8)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
This commit is contained in:
Chris Wilson 2019-11-18 23:02:46 +00:00 committed by Joonas Lahtinen
parent 732f9ca4a7
commit f83d7e3f51
2 changed files with 26 additions and 2 deletions
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13
drivers/gpu/drm/i915/intel_wakeref.c
View File

@ -109,8 +109,17 @@ void __intel_wakeref_init(struct intel_wakeref *wf,
int intel_wakeref_wait_for_idle(struct intel_wakeref *wf)
{
return wait_var_event_killable(&wf->wakeref,
!intel_wakeref_is_active(wf));
int err;
might_sleep();
err = wait_var_event_killable(&wf->wakeref,
!intel_wakeref_is_active(wf));
if (err)
return err;
intel_wakeref_unlock_wait(wf);
return 0;
}
static void wakeref_auto_timeout(struct timer_list *t)

15
drivers/gpu/drm/i915/intel_wakeref.h
View File

@ -151,6 +151,21 @@ intel_wakeref_unlock(struct intel_wakeref *wf)
mutex_unlock(&wf->mutex);
}
/**
* intel_wakeref_unlock_wait: Wait until the active callback is complete
* @wf: the wakeref
*
* Waits for the active callback (under the @wf->mutex or another CPU) is
* complete.
*/
static inline void
intel_wakeref_unlock_wait(struct intel_wakeref *wf)
{
mutex_lock(&wf->mutex);
mutex_unlock(&wf->mutex);
flush_work(&wf->work);
}
/**
* intel_wakeref_is_active: Query whether the wakeref is currently held
* @wf: the wakeref