[Intel-gfx] [PATCH 21/22] drm/i915: Bump the inactive tracking for all VMA accessed

[Chris Wilson]

We track the LRU access for eviction and bump the last access for the
user GGTT on set-to-gtt. When we do so we need to not only bump the
primary GGTT VMA but all partials as well. Similarly we want to
bump the last access tracking for when unpinning an object from the
scanout so that they do not get promptly evicted and hopefully remain
available for reuse on the next frame.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem.c | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index a76dffd3fbd7..ab3c96f09050 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3242,6 +3242,24 @@ i915_gem_object_flush_cpu_write_domain(struct drm_i915_gem_object *obj)
 					    I915_GEM_DOMAIN_CPU);
 }
 
+static void i915_gem_object_bump_inactive_ggtt(struct drm_i915_gem_object *obj)
+{
+	struct i915_vma *vma;
+
+	list_for_each_entry(vma, &obj->vma_list, obj_link) {
+		if (!i915_vma_is_ggtt(vma))
+			continue;
+
+		if (i915_vma_is_active(vma))
+			continue;
+
+		if (!drm_mm_node_allocated(&vma->node))
+			continue;
+
+		list_move_tail(&vma->vm_link, &vma->vm->inactive_list);
+	}
+}
+
 /**
  * Moves a single object to the GTT read, and possibly write domain.
  * @obj: object to act on
@@ -3254,7 +3272,6 @@ int
 i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write)
 {
 	uint32_t old_write_domain, old_read_domains;
-	struct i915_vma *vma;
 	int ret;
 
 	ret = i915_gem_object_wait_rendering(obj, !write);
@@ -3304,11 +3321,7 @@ i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write)
 					    old_write_domain);
 
 	/* And bump the LRU for this access */
-	vma = i915_gem_object_to_ggtt(obj, NULL);
-	if (vma &&
-	    drm_mm_node_allocated(&vma->node) &&
-	    !i915_vma_is_active(vma))
-		list_move_tail(&vma->vm_link, &vma->vm->inactive_list);
+	i915_gem_object_bump_inactive_ggtt(obj);
 
 	return 0;
 }
@@ -3611,6 +3624,10 @@ i915_gem_object_unpin_from_display_plane(struct i915_vma *vma)
 	if (--vma->obj->pin_display == 0)
 		vma->display_alignment = 0;
 
+	/* Bump the LRU to try and avoid premature eviction whilst flipping  */
+	if (!i915_vma_is_active(vma))
+		list_move_tail(&vma->vm_link, &vma->vm->inactive_list);
+
 	i915_vma_unpin(vma);
 	WARN_ON(vma->obj->pin_display > i915_vma_pin_count(vma));
 }
-- 
2.8.1