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drm/i915: Add a wakeref getter for iff the wakeref is already active

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For use in the next patch, we want to acquire a wakeref without having
to wake the device up -- i.e. only acquire the engine wakeref if the
engine is already active.

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/20190626154549.10066-1-chris@chris-wilson.co.uk
(cherry picked from commit de5147b8ce)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Chris Wilson
2019-06-26 16:45:47 +01:00
committed by Jani Nikula
parent 0de50e40fc
commit b1fa6fd94f
2 changed files with 24 additions and 1 deletions
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10
drivers/gpu/drm/i915/gt/intel_engine_pm.h
View File

@@ -7,12 +7,20 @@
#ifndef INTEL_ENGINE_PM_H #ifndef INTEL_ENGINE_PM_H
#define INTEL_ENGINE_PM_H #define INTEL_ENGINE_PM_H
#include "intel_engine_types.h"
#include "intel_wakeref.h"
struct drm_i915_private; struct drm_i915_private;
struct intel_engine_cs;
void intel_engine_pm_get(struct intel_engine_cs *engine); void intel_engine_pm_get(struct intel_engine_cs *engine);
void intel_engine_pm_put(struct intel_engine_cs *engine); void intel_engine_pm_put(struct intel_engine_cs *engine);
static inline bool
intel_engine_pm_get_if_awake(struct intel_engine_cs *engine)
{
return intel_wakeref_get_if_active(&engine->wakeref);
}
void intel_engine_park(struct intel_engine_cs *engine); void intel_engine_park(struct intel_engine_cs *engine);
void intel_engine_init__pm(struct intel_engine_cs *engine); void intel_engine_init__pm(struct intel_engine_cs *engine);

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

@@ -65,6 +65,21 @@ intel_wakeref_get(struct intel_runtime_pm *rpm,
return 0; return 0;
} }
/**
* intel_wakeref_get_if_in_use: Acquire the wakeref
* @wf: the wakeref
*
* Acquire a hold on the wakeref, but only if the wakeref is already
* active.
*
* Returns: true if the wakeref was acquired, false otherwise.
*/
static inline bool
intel_wakeref_get_if_active(struct intel_wakeref *wf)
{
return atomic_inc_not_zero(&wf->count);
}
/** /**
* intel_wakeref_put: Release the wakeref * intel_wakeref_put: Release the wakeref
* @i915: the drm_i915_private device * @i915: the drm_i915_private device