drm/i915: pass which operation triggered the frontbuffer tracking

We want to port FBC to the frontbuffer tracking infrastructure, but
for that we need to know what caused the object invalidation so
we can react accordingly: CPU mmaps need manual, GTT mmaps and
flips don't need handling and ring rendering needs nukes.

v2: - s/ORIGIN_RENDER/ORIGIN_CS/ (Daniel, Rodrigo)
    - Fix copy/pasted wrong documentation
    - Rebase
v3: - Rebase
v4: - Don't pass the operation to flushes (Daniel).
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_drv.h

@@ -788,6 +788,13 @@ struct intel_context {
 	struct list_head link;
 };
 
+enum fb_op_origin {
+	ORIGIN_GTT,
+	ORIGIN_CPU,
+	ORIGIN_CS,
+	ORIGIN_FLIP,
+};
+
 struct i915_fbc {
 	unsigned long uncompressed_size;
 	unsigned threshold;

drivers/gpu/drm/i915/i915_gem.c

@@ -3756,7 +3756,7 @@ i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write)
 	}
 
 	if (write)
-		intel_fb_obj_invalidate(obj, NULL);
+		intel_fb_obj_invalidate(obj, NULL, ORIGIN_GTT);
 
 	trace_i915_gem_object_change_domain(obj,
 					    old_read_domains,
@@ -4071,7 +4071,7 @@ i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write)
 	}
 
 	if (write)
-		intel_fb_obj_invalidate(obj, NULL);
+		intel_fb_obj_invalidate(obj, NULL, ORIGIN_CPU);
 
 	trace_i915_gem_object_change_domain(obj,
 					    old_read_domains,

drivers/gpu/drm/i915/i915_gem_execbuffer.c

@@ -971,7 +971,7 @@ i915_gem_execbuffer_move_to_active(struct list_head *vmas,
 			obj->dirty = 1;
 			i915_gem_request_assign(&obj->last_write_req, req);
 
-			intel_fb_obj_invalidate(obj, ring);
+			intel_fb_obj_invalidate(obj, ring, ORIGIN_CS);
 
 			/* update for the implicit flush after a batch */
 			obj->base.write_domain &= ~I915_GEM_GPU_DOMAINS;

drivers/gpu/drm/i915/intel_drv.h

@@ -873,7 +873,8 @@ void intel_ddi_set_vc_payload_alloc(struct drm_crtc *crtc, bool state);
 
 /* intel_frontbuffer.c */
 void intel_fb_obj_invalidate(struct drm_i915_gem_object *obj,
-			     struct intel_engine_cs *ring);
+			     struct intel_engine_cs *ring,
+			     enum fb_op_origin origin);
 void intel_frontbuffer_flip_prepare(struct drm_device *dev,
 				    unsigned frontbuffer_bits);
 void intel_frontbuffer_flip_complete(struct drm_device *dev,

drivers/gpu/drm/i915/intel_frontbuffer.c

@@ -127,6 +127,7 @@ static void intel_mark_fb_busy(struct drm_device *dev,
  * intel_fb_obj_invalidate - invalidate frontbuffer object
  * @obj: GEM object to invalidate
  * @ring: set for asynchronous rendering
+ * @origin: which operation caused the invalidation
  *
  * This function gets called every time rendering on the given object starts and
  * frontbuffer caching (fbc, low refresh rate for DRRS, panel self refresh) must
@@ -135,7 +136,8 @@ static void intel_mark_fb_busy(struct drm_device *dev,
  * scheduled.
  */
 void intel_fb_obj_invalidate(struct drm_i915_gem_object *obj,
-			     struct intel_engine_cs *ring)
+			     struct intel_engine_cs *ring,
+			     enum fb_op_origin origin)
 {
 	struct drm_device *dev = obj->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;