drm/i915: Move gpu_write_list to per-ring

... to prevent flush processing of an idle (or even absent) ring.

This fixes a regression during suspend from 87acb0a5.

Reported-and-tested-by: Alexey Fisher <bug-track@fisher-privat.net>
Tested-by: Peter Clifton <pcjc2@cam.ac.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 19 insertions, 17 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index e7f27a5b89dc..6c2618d884e7 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1657,12 +1657,11 @@ i915_gem_process_flushing_list(struct drm_device *dev,
         struct drm_i915_gem_object *obj_priv, *next;
 
         list_for_each_entry_safe(obj_priv, next,
-                                 &dev_priv->mm.gpu_write_list,
+                                 &ring->gpu_write_list,
                                  gpu_write_list) {
                 struct drm_gem_object *obj = &obj_priv->base;
 
-                if (obj->write_domain & flush_domains &&
-                    obj_priv->ring == ring) {
+                if (obj->write_domain & flush_domains) {
                         uint32_t old_write_domain = obj->write_domain;
 
                         obj->write_domain = 0;
@@ -2173,6 +2172,9 @@ i915_gem_object_unbind(struct drm_gem_object *obj)
 static int i915_ring_idle(struct drm_device *dev,
                           struct intel_ring_buffer *ring)
 {
+        if (list_empty(&ring->gpu_write_list))
+                return 0;
+
         i915_gem_flush_ring(dev, NULL, ring,
                             I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS);
         return i915_wait_request(dev,
@@ -3786,14 +3788,8 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 
         for (i = 0; i < args->buffer_count; i++) {
                 struct drm_gem_object *obj = object_list[i];
-                struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
                 uint32_t old_write_domain = obj->write_domain;
-
                 obj->write_domain = obj->pending_write_domain;
-                if (obj->write_domain)
-                        list_move_tail(&obj_priv->gpu_write_list,
-                                       &dev_priv->mm.gpu_write_list);
-
                 trace_i915_gem_object_change_domain(obj,
                                                     obj->read_domains,
                                                     old_write_domain);
@@ -3858,9 +3854,11 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 
         for (i = 0; i < args->buffer_count; i++) {
                 struct drm_gem_object *obj = object_list[i];
-                obj_priv = to_intel_bo(obj);
 
                 i915_gem_object_move_to_active(obj, ring);
+                if (obj->write_domain)
+                        list_move_tail(&to_intel_bo(obj)->gpu_write_list,
+                                       &ring->gpu_write_list);
         }
 
         i915_add_request(dev, file, request, ring);
@@ -4618,6 +4616,14 @@ i915_gem_lastclose(struct drm_device *dev)
                 DRM_ERROR("failed to idle hardware: %d\n", ret);
 }
 
+static void
+init_ring_lists(struct intel_ring_buffer *ring)
+{
+        INIT_LIST_HEAD(&ring->active_list);
+        INIT_LIST_HEAD(&ring->request_list);
+        INIT_LIST_HEAD(&ring->gpu_write_list);
+}
+
 void
 i915_gem_load(struct drm_device *dev)
 {
@@ -4626,17 +4632,13 @@ i915_gem_load(struct drm_device *dev)
 
         INIT_LIST_HEAD(&dev_priv->mm.active_list);
         INIT_LIST_HEAD(&dev_priv->mm.flushing_list);
-        INIT_LIST_HEAD(&dev_priv->mm.gpu_write_list);
         INIT_LIST_HEAD(&dev_priv->mm.inactive_list);
         INIT_LIST_HEAD(&dev_priv->mm.pinned_list);
         INIT_LIST_HEAD(&dev_priv->mm.fence_list);
         INIT_LIST_HEAD(&dev_priv->mm.deferred_free_list);
-        INIT_LIST_HEAD(&dev_priv->render_ring.active_list);
-        INIT_LIST_HEAD(&dev_priv->render_ring.request_list);
-        INIT_LIST_HEAD(&dev_priv->bsd_ring.active_list);
-        INIT_LIST_HEAD(&dev_priv->bsd_ring.request_list);
-        INIT_LIST_HEAD(&dev_priv->blt_ring.active_list);
-        INIT_LIST_HEAD(&dev_priv->blt_ring.request_list);
+        init_ring_lists(&dev_priv->render_ring);
+        init_ring_lists(&dev_priv->bsd_ring);
+        init_ring_lists(&dev_priv->blt_ring);
         for (i = 0; i < 16; i++)
                 INIT_LIST_HEAD(&dev_priv->fence_regs[i].lru_list);
         INIT_DELAYED_WORK(&dev_priv->mm.retire_work,