Commit b1fa6fd9 authored by Chris Wilson's avatar Chris Wilson Committed by Jani Nikula
Browse files

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



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: default avatarChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: default avatarMika 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 de5147b8)
Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
parent 0de50e40

drivers/gpu/drm/i915/gt/intel_engine_pm.h

+9 −1
Original line number Diff line number Diff line
@@ -7,12 +7,20 @@ 
#ifndef INTEL_ENGINE_PM_H

#define INTEL_ENGINE_PM_H



#include "intel_engine_types.h"

#include "intel_wakeref.h"



struct drm_i915_private;

struct intel_engine_cs;



void intel_engine_pm_get(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_init__pm(struct intel_engine_cs *engine);

drivers/gpu/drm/i915/intel_wakeref.h

+15 −0
Original line number Diff line number Diff line
@@ -65,6 +65,21 @@ intel_wakeref_get(struct intel_runtime_pm *rpm, 
	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

 * @i915: the drm_i915_private device

CRA Git | Maintained and supported by SUSTech CRA and CCSE