[Intel-gfx] [PATCH 2/3] drm/i915: Always flush the dirty CPU cache when pinning the scanout

[Chris Wilson]

Currently we only clflush the scanout if it is in the CPU domain. Also
flush if we have a pending CPU clflush. We also want to treat the
dirtyfb path similar, and flush any pending writes there as well.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem.c      | 9 +++++----
 drivers/gpu/drm/i915/intel_display.c | 2 ++
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index d48509783e41..6845cf03287c 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3356,12 +3356,12 @@ int i915_gem_object_set_cache_level(struct drm_i915_gem_object *obj,
 				    enum i915_cache_level cache_level)
 {
 	struct i915_vma *vma;
-	int ret = 0;
+	int ret;
 
 	lockdep_assert_held(&obj->base.dev->struct_mutex);
 
 	if (obj->cache_level == cache_level)
-		goto out;
+		return 0;
 
 	/* Inspect the list of currently bound VMA and unbind any that would
 	 * be invalid given the new cache-level. This is principally to
@@ -3459,7 +3459,6 @@ int i915_gem_object_set_cache_level(struct drm_i915_gem_object *obj,
 		vma->node.color = cache_level;
 	obj->cache_level = cache_level;
 
-out:
 	/* Flush the dirty CPU caches to the backing storage so that the
 	 * object is now coherent at its new cache level (with respect
 	 * to the access domain).
@@ -3608,7 +3607,9 @@ i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
 
 	vma->display_alignment = max_t(u64, vma->display_alignment, alignment);
 
-	i915_gem_object_flush_cpu_write_domain(obj);
+	if (obj->cache_dirty || obj->base.write_domain == I915_GEM_DOMAIN_CPU)
+		i915_gem_clflush_object(obj, true);
+	intel_fb_obj_flush(obj, false, ORIGIN_CPU);
 
 	old_write_domain = obj->base.write_domain;
 	old_read_domains = obj->base.read_domains;
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 92ab01f33208..47233b242c99 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -15698,6 +15698,8 @@ static int intel_user_framebuffer_dirty(struct drm_framebuffer *fb,
 	struct drm_i915_gem_object *obj = intel_fb->obj;
 
 	mutex_lock(&dev->struct_mutex);
+	if (obj->pin_display && obj->cache_dirty)
+		i915_gem_clflush_object(obj, true);
 	intel_fb_obj_flush(obj, false, ORIGIN_DIRTYFB);
 	mutex_unlock(&dev->struct_mutex);
 
-- 
2.10.2