drm/i915: Refactor the wait_rendering completion into a common routine

Harmonise the completion logic between the non-blocking and normal
wait_rendering paths, and move that logic into a common function.

In the process, we note that the last_write_seqno is by definition the
earlier of the two read/write seqnos and so all successful waits will
have passed the last_write_seqno. Therefore we can unconditionally clear
the write seqno and its domains in the completion logic.

v2: Add the missing ring parameter, because sometimes it is good to have
things compile.

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

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 18025fd..769f752 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1087,6 +1087,25 @@ i915_wait_seqno(struct intel_ring_buffer *ring, uint32_t seqno)
                            interruptible, NULL);
 }
 
+static int
+i915_gem_object_wait_rendering__tail(struct drm_i915_gem_object *obj,
+                                    struct intel_ring_buffer *ring)
+{
+       i915_gem_retire_requests_ring(ring);
+
+       /* Manually manage the write flush as we may have not yet
+        * retired the buffer.
+        *
+        * Note that the last_write_seqno is always the earlier of
+        * the two (read/write) seqno, so if we haved successfully waited,
+        * we know we have passed the last write.
+        */
+       obj->last_write_seqno = 0;
+       obj->base.write_domain &= ~I915_GEM_GPU_DOMAINS;
+
+       return 0;
+}
+
 /**
  * Ensures that all rendering to the object has completed and the object is
  * safe to unbind from the GTT or access from the CPU.
@@ -1107,18 +1126,7 @@ i915_gem_object_wait_rendering(struct drm_i915_gem_object *obj,
        if (ret)
                return ret;
 
-       i915_gem_retire_requests_ring(ring);
-
-       /* Manually manage the write flush as we may have not yet
-        * retired the buffer.
-        */
-       if (obj->last_write_seqno &&
-           i915_seqno_passed(seqno, obj->last_write_seqno)) {
-               obj->last_write_seqno = 0;
-               obj->base.write_domain &= ~I915_GEM_GPU_DOMAINS;
-       }
-
-       return 0;
+       return i915_gem_object_wait_rendering__tail(obj, ring);
 }
 
 /* A nonblocking variant of the above wait. This is a highly dangerous routine
@@ -1154,20 +1162,10 @@ i915_gem_object_wait_rendering__nonblocking(struct drm_i915_gem_object *obj,
        mutex_unlock(&dev->struct_mutex);
        ret = __wait_seqno(ring, seqno, reset_counter, true, NULL);
        mutex_lock(&dev->struct_mutex);
+       if (ret)
+               return ret;
 
-       i915_gem_retire_requests_ring(ring);
-
-       /* Manually manage the write flush as we may have not yet
-        * retired the buffer.
-        */
-       if (ret == 0 &&
-           obj->last_write_seqno &&
-           i915_seqno_passed(seqno, obj->last_write_seqno)) {
-               obj->last_write_seqno = 0;
-               obj->base.write_domain &= ~I915_GEM_GPU_DOMAINS;
-       }
-
-       return ret;
+       return i915_gem_object_wait_rendering__tail(obj, ring);
 }
 
 /**