On Wed, Jul 13, 2022 at 09:12:26AM +0100, Mauro Carvalho Chehab wrote: > The intel_gt_pm.h file contains some convenient macros to be used > in GT code in order to get/put runtime PM references and for > checking them. > > Add descriptions based on the ones at intel_wakeref.h and > intel_runtime_pm.c. > > Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> > --- > > To avoid mailbombing on a large number of people, only mailing lists were C/C on the cover. > See [PATCH v2 00/39] at: https://lore.kernel.org/all/cover.1657699522.git.mchehab@xxxxxxxxxx/ > > Documentation/gpu/i915.rst | 2 + > drivers/gpu/drm/i915/gt/intel_gt_pm.h | 62 +++++++++++++++++++++++++++ > 2 files changed, 64 insertions(+) > > diff --git a/Documentation/gpu/i915.rst b/Documentation/gpu/i915.rst > index 6bb50edc6d79..9862d504df4d 100644 > --- a/Documentation/gpu/i915.rst > +++ b/Documentation/gpu/i915.rst > @@ -709,6 +709,8 @@ Table Manager (TTM) > > .. kernel-doc:: drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c > > +.. kernel-doc:: drivers/gpu/drm/i915/gt/intel_gt_pm.h I don't believe this is the right placement for this. the rest lgtm > + > Graphics Execution Manager (GEM) > -------------------------------- > > diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.h b/drivers/gpu/drm/i915/gt/intel_gt_pm.h > index bc898df7a48c..a8ea6846980a 100644 > --- a/drivers/gpu/drm/i915/gt/intel_gt_pm.h > +++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.h > @@ -11,21 +11,57 @@ > #include "intel_gt_types.h" > #include "intel_wakeref.h" > > +/** > + * intel_gt_pm_is_awake: Query whether the runtime PM is awake held > + * > + * @gt: pointer to the graphics engine > + * > + * Returns: true if a runtime pm reference is currently held and the GT is > + * awake. > + */ > static inline bool intel_gt_pm_is_awake(const struct intel_gt *gt) > { > return intel_wakeref_is_active(>->wakeref); > } > > +/** > + * intel_gt_pm_get: grab a runtime PM reference ensuring that GT is powered up > + * @gt: pointer to the graphics engine > + * > + * Any runtime pm reference obtained by this function must have a symmetric > + * call to intel_gt_pm_put() to release the reference again. > + * > + * Note that this is allowed to fail, in which case the runtime-pm wakeref > + * will be released and the acquisition unwound. > + */ > static inline void intel_gt_pm_get(struct intel_gt *gt) > { > intel_wakeref_get(>->wakeref); > } > > +/** > + * __intel_gt_pm_get: Acquire the runtime PM reference again > + * @gt: pointer to the graphics engine which contains the wakeref > + * > + * Increment the PM reference counter, only valid if it is already held by > + * the caller. > + * > + * See intel_gt_pm_get(). > + */ > static inline void __intel_gt_pm_get(struct intel_gt *gt) > { > __intel_wakeref_get(>->wakeref); > } > > +/** > + * intel_gt_pm_get_if_awake: Acquire the runtime PM reference if active > + * @gt: pointer to the graphics engine which contains the PM reference > + * > + * Acquire a hold on the PM reference, but only if the GT is already > + * active. > + * > + * Returns: true if the wakeref was acquired, false otherwise. > + */ > static inline bool intel_gt_pm_get_if_awake(struct intel_gt *gt) > { > return intel_wakeref_get_if_active(>->wakeref); > @@ -36,6 +72,14 @@ static inline void intel_gt_pm_might_get(struct intel_gt *gt) > intel_wakeref_might_get(>->wakeref); > } > > +/** > + * intel_gt_pm_put: Release the runtime PM reference > + * @gt: pointer to the graphics engine which contains the PM reference > + * > + * Release our hold on the runtime PM for GT. > + * > + * It might power down the GT right away if this is the last reference. > + */ > static inline void intel_gt_pm_put(struct intel_gt *gt) > { > intel_wakeref_put(>->wakeref); > @@ -51,10 +95,28 @@ static inline void intel_gt_pm_might_put(struct intel_gt *gt) > intel_wakeref_might_put(>->wakeref); > } > > +/** > + * with_intel_gt_pm - get a GT reference ensuring that GT is powered up, > + * run some code and then put the reference away. > + * > + * @gt: pointer to the gt > + * @tmp: pointer to a temporary wakeref. > + */ > #define with_intel_gt_pm(gt, tmp) \ > for (tmp = 1, intel_gt_pm_get(gt); tmp; \ > intel_gt_pm_put(gt), tmp = 0) > > +/** > + * intel_gt_pm_wait_for_idle: Wait until the runtime PM reference is idle > + * @gt: pointer to the graphics engine which contains the PM reference > + * > + * Wait for the earlier asynchronous release of the runtime PM reference. Note > + * this will wait for any third party as well, so make sure you only wait > + * when you have control over the GT runtime PM and trust no one else is > + * acquiring it. > + * > + * Return: 0 on success, error code if killed. > + */ > static inline int intel_gt_pm_wait_for_idle(struct intel_gt *gt) > { > return intel_wakeref_wait_for_idle(>->wakeref); > -- > 2.36.1 >
