drm/i915: Discard the unused obj->last_fenced_ring

As we now never pipeline a fence update, obj->last_fenced_ring is always
the same as the obj->ring whenever obj->last_fenced_seqno is active, so
remove it.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 7 insertions, 14 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 6a504f997251..69e153956182 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -930,13 +930,12 @@ struct drm_i915_gem_object {
          */
         uint32_t gtt_offset;
 
-        /** Breadcrumb of last rendering to the buffer. */
-        uint32_t last_rendering_seqno;
         struct intel_ring_buffer *ring;
 
+        /** Breadcrumb of last rendering to the buffer. */
+        uint32_t last_rendering_seqno;
         /** Breadcrumb of last fenced GPU access to the buffer. */
         uint32_t last_fenced_seqno;
-        struct intel_ring_buffer *last_fenced_ring;
 
         /** Current tiling stride for the object, if it's tiled. */
         uint32_t stride;
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 3a091f55fbcc..b25d22971513 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1398,7 +1398,6 @@ i915_gem_object_move_to_active(struct drm_i915_gem_object *obj,
 
         if (obj->fenced_gpu_access) {
                 obj->last_fenced_seqno = seqno;
-                obj->last_fenced_ring = ring;
 
                 /* Bump MRU to take account of the delayed flush */
                 if (obj->fence_reg != I915_FENCE_REG_NONE) {
@@ -1445,7 +1444,6 @@ i915_gem_object_move_to_inactive(struct drm_i915_gem_object *obj)
         BUG_ON(!list_empty(&obj->gpu_write_list));
         BUG_ON(!obj->active);
         obj->ring = NULL;
-        obj->last_fenced_ring = NULL;
 
         i915_gem_object_move_off_active(obj);
         obj->fenced_gpu_access = false;
@@ -1650,7 +1648,6 @@ static void i915_gem_reset_fences(struct drm_device *dev)
                 reg->obj->fence_reg = I915_FENCE_REG_NONE;
                 reg->obj->fenced_gpu_access = false;
                 reg->obj->last_fenced_seqno = 0;
-                reg->obj->last_fenced_ring = NULL;
                 i915_gem_clear_fence_reg(dev, reg);
         }
 }
@@ -2295,7 +2292,7 @@ i915_gem_object_flush_fence(struct drm_i915_gem_object *obj)
 
         if (obj->fenced_gpu_access) {
                 if (obj->base.write_domain & I915_GEM_GPU_DOMAINS) {
-                        ret = i915_gem_flush_ring(obj->last_fenced_ring,
+                        ret = i915_gem_flush_ring(obj->ring,
                                                   0, obj->base.write_domain);
                         if (ret)
                                 return ret;
@@ -2304,10 +2301,10 @@ i915_gem_object_flush_fence(struct drm_i915_gem_object *obj)
                 obj->fenced_gpu_access = false;
         }
 
-        if (obj->last_fenced_seqno && NULL != obj->last_fenced_ring) {
-                if (!ring_passed_seqno(obj->last_fenced_ring,
+        if (obj->last_fenced_seqno) {
+                if (!ring_passed_seqno(obj->ring,
                                        obj->last_fenced_seqno)) {
-                        ret = i915_wait_request(obj->last_fenced_ring,
+                        ret = i915_wait_request(obj->ring,
                                                 obj->last_fenced_seqno,
                                                 true);
                         if (ret)
@@ -2315,7 +2312,6 @@ i915_gem_object_flush_fence(struct drm_i915_gem_object *obj)
                 }
 
                 obj->last_fenced_seqno = 0;
-                obj->last_fenced_ring = NULL;
         }
 
         /* Ensure that all CPU reads are completed before installing a fence
@@ -2382,7 +2378,7 @@ i915_find_fence_reg(struct drm_device *dev)
                 if (first == NULL)
                         first = reg;
 
-                if (reg->obj->last_fenced_ring == NULL) {
+                if (reg->obj->last_fenced_seqno == 0) {
                         avail = reg;
                         break;
                 }
@@ -2458,7 +2454,6 @@ i915_gem_object_get_fence(struct drm_i915_gem_object *obj)
                 }
 
                 old->fence_reg = I915_FENCE_REG_NONE;
-                old->last_fenced_ring = NULL;
                 old->last_fenced_seqno = 0;
 
                 drm_gem_object_unreference(&old->base);
@@ -2467,7 +2462,6 @@ i915_gem_object_get_fence(struct drm_i915_gem_object *obj)
         reg->obj = obj;
         list_move_tail(&reg->lru_list, &dev_priv->mm.fence_list);
         obj->fence_reg = reg - dev_priv->fence_regs;
-        obj->last_fenced_ring = NULL;
 
 update:
         obj->tiling_changed = false;