From de5147b8ce6d51f634661d7c531385371485cec6 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Wed, 26 Jun 2019 16:45:47 +0100 Subject: [PATCH] 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: Chris Wilson Reviewed-by: Mika Kuoppala Link: https://patchwork.freedesktop.org/patch/msgid/20190626154549.10066-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/gt/intel_engine_pm.h | 7 ++++++- drivers/gpu/drm/i915/intel_wakeref.h | 15 +++++++++++++++ 2 files changed, 21 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gt/intel_engine_pm.h b/drivers/gpu/drm/i915/gt/intel_engine_pm.h index f3f5b031b4a1..7d057cdcd919 100644 --- a/drivers/gpu/drm/i915/gt/intel_engine_pm.h +++ b/drivers/gpu/drm/i915/gt/intel_engine_pm.h @@ -11,7 +11,6 @@ #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); @@ -22,6 +21,12 @@ intel_engine_pm_is_awake(const struct intel_engine_cs *engine) return intel_wakeref_is_active(&engine->wakeref); } +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); diff --git a/drivers/gpu/drm/i915/intel_wakeref.h b/drivers/gpu/drm/i915/intel_wakeref.h index f74272770a5c..1d6f5986e4e5 100644 --- a/drivers/gpu/drm/i915/intel_wakeref.h +++ b/drivers/gpu/drm/i915/intel_wakeref.h @@ -71,6 +71,21 @@ 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