[Intel-gfx] [PATCH v4 4/4] drm/i915: Add function to clear scanout flag for vmas

[Jouni Högander]

Currently frontbuffer tracking code is directly iterating over object vmas
and clearing scanout flags for them. Add function to clear scanout flag for
vmas and use it from frontbuffer tracking code.

v2: describe function parameter.

Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
Reviewed-by: Jani Nikula <jani.nikula at intel.com>
---
 .../gpu/drm/i915/display/intel_frontbuffer.c  |  8 +-------
 drivers/gpu/drm/i915/i915_vma.c               | 20 +++++++++++++++++++
 drivers/gpu/drm/i915/i915_vma.h               |  2 ++
 3 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_frontbuffer.c b/drivers/gpu/drm/i915/display/intel_frontbuffer.c
index 56f45370fee0..22392f94b626 100644
--- a/drivers/gpu/drm/i915/display/intel_frontbuffer.c
+++ b/drivers/gpu/drm/i915/display/intel_frontbuffer.c
@@ -226,16 +226,10 @@ static void frontbuffer_release(struct kref *ref)
 	struct intel_frontbuffer *front =
 		container_of(ref, typeof(*front), ref);
 	struct drm_i915_gem_object *obj = front->obj;
-	struct i915_vma *vma;
 
 	drm_WARN_ON(&intel_bo_to_i915(obj)->drm, atomic_read(&front->bits));
 
-	spin_lock(&obj->vma.lock);
-	for_each_ggtt_vma(vma, obj) {
-		i915_vma_clear_scanout(vma);
-		vma->display_alignment = I915_GTT_MIN_ALIGNMENT;
-	}
-	spin_unlock(&obj->vma.lock);
+	i915_ggtt_clear_scanout(obj);
 
 	i915_gem_object_set_frontbuffer(obj, NULL);
 	spin_unlock(&intel_bo_to_i915(obj)->display.fb_tracking.lock);
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index e90b9c812180..63e111266de1 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -1629,6 +1629,26 @@ int i915_ggtt_pin(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
 	return err;
 }
 
+/**
+ * i915_ggtt_clear_scanout - Clear scanout flag for all objects ggtt vmas
+ * @obj: i915 GEM object
+ * This function clears scanout flags for objects ggtt vmas. These flags are set
+ * when object is pinned for display use and this function to clear them all is
+ * targeted to be called by frontbuffer tracking code when the frontbuffer is
+ * about to be released.
+ */
+void i915_ggtt_clear_scanout(struct drm_i915_gem_object *obj)
+{
+	struct i915_vma *vma;
+
+	spin_lock(&obj->vma.lock);
+	for_each_ggtt_vma(vma, obj) {
+		i915_vma_clear_scanout(vma);
+		vma->display_alignment = I915_GTT_MIN_ALIGNMENT;
+	}
+	spin_unlock(&obj->vma.lock);
+}
+
 static void __vma_close(struct i915_vma *vma, struct intel_gt *gt)
 {
 	/*
diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h
index 9a9729205d5b..eaa310864370 100644
--- a/drivers/gpu/drm/i915/i915_vma.h
+++ b/drivers/gpu/drm/i915/i915_vma.h
@@ -435,6 +435,8 @@ static inline void i915_vma_clear_scanout(struct i915_vma *vma)
 	clear_bit(I915_VMA_SCANOUT_BIT, __i915_vma_flags(vma));
 }
 
+void i915_ggtt_clear_scanout(struct drm_i915_gem_object *obj);
+
 #define for_each_until(cond) if (cond) break; else
 
 /**
-- 
2.34.1