drm/i915: Stop discarding GTT cache-domain on unbind vma

Since commit 43566dedde54 ("drm/i915: Broaden application of
set-domain(GTT)") we allowed objects to be in the GTT domain, but unbound.
Therefore removing the GTT cache domain when removing the GGTT vma is no
longer semantically correct.

An unfortunate side-effect is we lose the wondrously named
i915_gem_object_finish_gtt(), not to be confused with
i915_gem_gtt_finish_object()!

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Akash Goel <akash.goel@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160818161718.27187-30-chris@chris-wilson.co.uk

1 files changed, 3 insertions, 23 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 14c624ee6dbf..0e1f5dde2e87 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2857,27 +2857,6 @@ i915_gem_object_sync(struct drm_i915_gem_object *obj,
         return 0;
 }
 
-static void i915_gem_object_finish_gtt(struct drm_i915_gem_object *obj)
-{
-        u32 old_write_domain, old_read_domains;
-
-        /* Force a pagefault for domain tracking on next user access */
-        i915_gem_release_mmap(obj);
-
-        if ((obj->base.read_domains & I915_GEM_DOMAIN_GTT) == 0)
-                return;
-
-        old_read_domains = obj->base.read_domains;
-        old_write_domain = obj->base.write_domain;
-
-        obj->base.read_domains &= ~I915_GEM_DOMAIN_GTT;
-        obj->base.write_domain &= ~I915_GEM_DOMAIN_GTT;
-
-        trace_i915_gem_object_change_domain(obj,
-                                            old_read_domains,
-                                            old_write_domain);
-}
-
 static void __i915_vma_iounmap(struct i915_vma *vma)
 {
         GEM_BUG_ON(i915_vma_is_pinned(vma));
@@ -2933,13 +2912,14 @@ int i915_vma_unbind(struct i915_vma *vma)
         GEM_BUG_ON(!obj->pages);
 
         if (i915_vma_is_map_and_fenceable(vma)) {
-                i915_gem_object_finish_gtt(obj);
-
                 /* release the fence reg _after_ flushing */
                 ret = i915_vma_put_fence(vma);
                 if (ret)
                         return ret;
 
+                /* Force a pagefault for domain tracking on next user access */
+                i915_gem_release_mmap(obj);
+
                 __i915_vma_iounmap(vma);
                 vma->flags &= ~I915_VMA_CAN_FENCE;
         }