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drm/i915: Mark intel_wakeref_get() as a sleeper

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Assume that intel_wakeref_get() may take the mutex, and perform other
sleeping actions in the course of its callbacks and so use might_sleep()
to ensure that all callers abide. Anything that cannot sleep has to use
e.g. intel_wakeref_get_if_active() to guarantee its avoidance of the
non-atomic paths.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191121130528.309474-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-11-21 13:05:28 +00:00
parent c95d31c3df
commit 93b0e8fe47
4 changed files with 24 additions and 4 deletions
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5
drivers/gpu/drm/i915/gt/intel_gt_pm.h
View File

@ -22,6 +22,11 @@ static inline void intel_gt_pm_get(struct intel_gt *gt)
intel_wakeref_get(&gt->wakeref);
}
static inline void __intel_gt_pm_get(struct intel_gt *gt)
{
__intel_wakeref_get(&gt->wakeref);
}
static inline bool intel_gt_pm_get_if_awake(struct intel_gt *gt)
{
return intel_wakeref_get_if_active(&gt->wakeref);

2
drivers/gpu/drm/i915/gt/intel_lrc.c
View File

@ -1121,7 +1121,7 @@ __execlists_schedule_in(struct i915_request *rq)
BUILD_BUG_ON(NUM_CONTEXT_TAG > GEN12_MAX_CONTEXT_HW_ID);
}
intel_gt_pm_get(engine->gt);
__intel_gt_pm_get(engine->gt);
execlists_context_status_change(rq, INTEL_CONTEXT_SCHEDULE_IN);
intel_engine_context_in(engine);

2
drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
View File

@ -529,7 +529,7 @@ static struct i915_request *schedule_in(struct i915_request *rq, int idx)
* required if we generalise the inflight tracking.
*/
intel_gt_pm_get(rq->engine->gt);
__intel_gt_pm_get(rq->engine->gt);
return i915_request_get(rq);
}

19
drivers/gpu/drm/i915/intel_wakeref.h
View File

@ -59,9 +59,7 @@ void __intel_wakeref_put_last(struct intel_wakeref *wf, unsigned long flags);
/**
* intel_wakeref_get: Acquire the wakeref
* @i915: the drm_i915_private device
* @wf: the wakeref
* @fn: callback for acquired the wakeref, called only on first acquire.
*
* Acquire a hold on the wakeref. The first user to do so, will acquire
* the runtime pm wakeref and then call the @fn underneath the wakeref
@ -76,12 +74,29 @@ void __intel_wakeref_put_last(struct intel_wakeref *wf, unsigned long flags);
static inline int
intel_wakeref_get(struct intel_wakeref *wf)
{
might_sleep();
if (unlikely(!atomic_inc_not_zero(&wf->count)))
return __intel_wakeref_get_first(wf);
return 0;
}
/**
* __intel_wakeref_get: Acquire the wakeref, again
* @wf: the wakeref
*
* Increment the wakeref counter, only valid if it is already held by
* the caller.
*
* See intel_wakeref_get().
*/
static inline void
__intel_wakeref_get(struct intel_wakeref *wf)
{
INTEL_WAKEREF_BUG_ON(atomic_read(&wf->count) <= 0);
atomic_inc(&wf->count);
}
/**
* intel_wakeref_get_if_in_use: Acquire the wakeref
* @wf: the wakeref