drm/i915: extract object active state flushing code

Both busy_ioctl and the new wait_ioct need to do the same dance (or at
least should). Some slight changes:
- busy_ioctl now unconditionally checks for olr. Before emitting a
  require flush would have prevent the olr check and hence required a
  second call to the busy ioctl to really emit the request.
- the timeout wait now also retires request. Not really required for
  abi-reasons, but makes a notch more sense imo.

I've tested this by pimping the i-g-t test some more and also checking
the polling behviour of the wait_rendering_timeout ioctl versus what
busy_ioctl returns.

v2: Too many people complained about unplug, new color is
flush_active.

v3: Kill the comment about the unplug moniker.

v4: s/un-active/inactive/

Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
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 a20ac43..af67803 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2029,6 +2029,31 @@ i915_gem_object_wait_rendering(struct drm_i915_gem_object *obj)
        return 0;
 }
 
+/**
+ * Ensures that an object will eventually get non-busy by flushing any required
+ * write domains, emitting any outstanding lazy request and retiring and
+ * completed requests.
+ */
+static int
+i915_gem_object_flush_active(struct drm_i915_gem_object *obj)
+{
+       int ret;
+
+       if (obj->active) {
+               ret = i915_gem_object_flush_gpu_write_domain(obj);
+               if (ret)
+                       return ret;
+
+               ret = i915_gem_check_olr(obj->ring,
+                                        obj->last_rendering_seqno);
+               if (ret)
+                       return ret;
+               i915_gem_retire_requests_ring(obj->ring);
+       }
+
+       return 0;
+}
+
 /**
  * i915_gem_wait_ioctl - implements DRM_IOCTL_I915_GEM_WAIT
  * @DRM_IOCTL_ARGS: standard ioctl arguments
@@ -2073,11 +2098,8 @@ i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
                return -ENOENT;
        }
 
-       /* Need to make sure the object is flushed first. This non-obvious
-        * flush is required to enforce that (active && !olr) == no wait
-        * necessary.
-        */
-       ret = i915_gem_object_flush_gpu_write_domain(obj);
+       /* Need to make sure the object gets inactive eventually. */
+       ret = i915_gem_object_flush_active(obj);
        if (ret)
                goto out;
 
@@ -2089,10 +2111,6 @@ i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
        if (seqno == 0)
                 goto out;
 
-       ret = i915_gem_check_olr(ring, seqno);
-       if (ret)
-               goto out;
-
        /* Do this after OLR check to make sure we make forward progress polling
         * on this IOCTL with a 0 timeout (like busy ioctl)
         */
@@ -3330,30 +3348,9 @@ i915_gem_busy_ioctl(struct drm_device *dev, void *data,
         * become non-busy without any further actions, therefore emit any
         * necessary flushes here.
         */
-       args->busy = obj->active;
-       if (args->busy) {
-               /* Unconditionally flush objects, even when the gpu still uses this
-                * object. Userspace calling this function indicates that it wants to
-                * use this buffer rather sooner than later, so issuing the required
-                * flush earlier is beneficial.
-                */
-               if (obj->base.write_domain & I915_GEM_GPU_DOMAINS) {
-                       ret = i915_gem_flush_ring(obj->ring,
-                                                 0, obj->base.write_domain);
-               } else {
-                       ret = i915_gem_check_olr(obj->ring,
-                                                obj->last_rendering_seqno);
-               }
+       ret = i915_gem_object_flush_active(obj);
 
-               /* Update the active list for the hardware's current position.
-                * Otherwise this only updates on a delayed timer or when irqs
-                * are actually unmasked, and our working set ends up being
-                * larger than required.
-                */
-               i915_gem_retire_requests_ring(obj->ring);
-
-               args->busy = obj->active;
-       }
+       args->busy = obj->active;
 
        drm_gem_object_unreference(&obj->base);
 unlock: