drm/i915: Apply big hammer to serialise buffer access between rings

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 469a5b1a48aaf6eb3e38d7dcf875a9bb33d18178..984eb6e9db033c71c49c1589a5f58f55ad3e9fd2 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3106,7 +3106,8 @@ i915_gem_object_set_to_gpu_domain(struct drm_gem_object *obj,
         * write domain
         */
        if (obj->write_domain &&
-           obj->write_domain != obj->pending_read_domains) {
+           (obj->write_domain != obj->pending_read_domains ||
+            obj_priv->ring != ring)) {
                flush_domains |= obj->write_domain;
                invalidate_domains |=
                        obj->pending_read_domains & ~obj->write_domain;
@@ -3495,6 +3496,52 @@ i915_gem_execbuffer_pin(struct drm_device *dev,
        return 0;
 }
 
+static int
+i915_gem_execbuffer_move_to_gpu(struct drm_device *dev,
+                               struct drm_file *file,
+                               struct intel_ring_buffer *ring,
+                               struct drm_gem_object **objects,
+                               int count)
+{
+       struct drm_i915_private *dev_priv = dev->dev_private;
+       int ret, i;
+
+       /* Zero the global flush/invalidate flags. These
+        * will be modified as new domains are computed
+        * for each object
+        */
+       dev->invalidate_domains = 0;
+       dev->flush_domains = 0;
+       dev_priv->mm.flush_rings = 0;
+       for (i = 0; i < count; i++)
+               i915_gem_object_set_to_gpu_domain(objects[i], ring);
+
+       if (dev->invalidate_domains | dev->flush_domains) {
+#if WATCH_EXEC
+               DRM_INFO("%s: invalidate_domains %08x flush_domains %08x\n",
+                         __func__,
+                        dev->invalidate_domains,
+                        dev->flush_domains);
+#endif
+               i915_gem_flush(dev, file,
+                              dev->invalidate_domains,
+                              dev->flush_domains,
+                              dev_priv->mm.flush_rings);
+       }
+
+       for (i = 0; i < count; i++) {
+               struct drm_i915_gem_object *obj = to_intel_bo(objects[i]);
+               /* XXX replace with semaphores */
+               if (obj->ring && ring != obj->ring) {
+                       ret = i915_gem_object_wait_rendering(&obj->base, true);
+                       if (ret)
+                               return ret;
+               }
+       }
+
+       return 0;
+}
+
 /* Throttle our rendering by waiting until the ring has completed our requests
  * emitted over 20 msec ago.
  *
@@ -3755,33 +3802,10 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
                goto err;
        }
 
-       /* Zero the global flush/invalidate flags. These
-        * will be modified as new domains are computed
-        * for each object
-        */
-       dev->invalidate_domains = 0;
-       dev->flush_domains = 0;
-       dev_priv->mm.flush_rings = 0;
-
-       for (i = 0; i < args->buffer_count; i++) {
-               struct drm_gem_object *obj = object_list[i];
-
-               /* Compute new gpu domains and update invalidate/flush */
-               i915_gem_object_set_to_gpu_domain(obj, ring);
-       }
-
-       if (dev->invalidate_domains | dev->flush_domains) {
-#if WATCH_EXEC
-               DRM_INFO("%s: invalidate_domains %08x flush_domains %08x\n",
-                         __func__,
-                        dev->invalidate_domains,
-                        dev->flush_domains);
-#endif
-               i915_gem_flush(dev, file,
-                              dev->invalidate_domains,
-                              dev->flush_domains,
-                              dev_priv->mm.flush_rings);
-       }
+       ret = i915_gem_execbuffer_move_to_gpu(dev, file, ring,
+                                             object_list, args->buffer_count);
+       if (ret)
+               goto err;
 
        for (i = 0; i < args->buffer_count; i++) {
                struct drm_gem_object *obj = object_list[i];