[Intel-gfx] [PATCH 1/2] drm/i915: add assumed cpu-dirtied flush

[Ben Widawsky]

Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_drv.h            |    2 ++
 drivers/gpu/drm/i915/i915_gem_execbuffer.c |    4 ++++
 2 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index feb4f16..2a61e63 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -879,6 +879,8 @@ struct drm_i915_gem_object {
 	 * reaches 0, dev_priv->pending_flip_queue will be woken up.
 	 */
 	atomic_t pending_flip;
+
+	atomic_t always_cpu_dirty;
 };
 
 #define to_intel_bo(x) container_of(x, struct drm_i915_gem_object, base)
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 4934cf8..f60cfcc 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -201,6 +201,10 @@ i915_gem_object_set_to_gpu_domain(struct drm_i915_gem_object *obj,
 
 	cd->invalidate_domains |= invalidate_domains;
 	cd->flush_domains |= flush_domains;
+
+	if (atomic_read(&obj->always_cpu_dirty))
+		cd->flush_domains |= I915_GEM_DOMAIN_CPU;
+
 	if (flush_domains & I915_GEM_GPU_DOMAINS)
 		cd->flush_rings |= obj->ring->id;
 	if (invalidate_domains & I915_GEM_GPU_DOMAINS)
-- 
1.7.6