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@xxxxxxxxxxxxxxxxxx>
---
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
--
2.20.1
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