From: Ben Widawsky Date: Tue, 24 Sep 2013 16:57:57 +0000 (-0700) Subject: drm/i915: Provide a cheap ggtt vma lookup X-Git-Tag: firefly_0821_release~176^2~4694^2~167^2~59 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=5c2abbeab798154166d42fce4f71790caa6dd9bc;p=firefly-linux-kernel-4.4.55.git drm/i915: Provide a cheap ggtt vma lookup "We do fairly often lookup the ggtt vma for an obj." - Chris Wilson. As such, provide a function to offer slightly cheaper access to the vma. Not performance tested. By my quick estimation it saves at least 3 pointer dereferences from the existing mechanism. This patch mostly matches code from Chris in <20130911221430.GB7825@nuc-i3427.alporthouse.com> Reviewed-by: Chris Wilson Signed-off-by: Ben Widawsky Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 662c0ff0b049..a3d43b25e1d9 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -2030,6 +2030,9 @@ struct i915_vma *i915_gem_obj_to_vma(struct drm_i915_gem_object *obj, struct i915_vma * i915_gem_obj_lookup_or_create_vma(struct drm_i915_gem_object *obj, struct i915_address_space *vm); + +struct i915_vma *i915_gem_obj_to_ggtt(struct drm_i915_gem_object *obj); + /* Some GGTT VM helpers */ #define obj_to_ggtt(obj) \ (&((struct drm_i915_private *)(obj)->base.dev->dev_private)->gtt.base) @@ -2066,7 +2069,6 @@ i915_gem_obj_ggtt_pin(struct drm_i915_gem_object *obj, return i915_gem_object_pin(obj, obj_to_ggtt(obj), alignment, map_and_fenceable, nonblocking); } -#undef obj_to_ggtt /* i915_gem_context.c */ void i915_gem_context_init(struct drm_device *dev); diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 96ad99ccf0ac..0d6b012b4f60 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -3410,8 +3410,7 @@ i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write) /* And bump the LRU for this access */ if (i915_gem_object_is_inactive(obj)) { - struct i915_vma *vma = i915_gem_obj_to_vma(obj, - &dev_priv->gtt.base); + struct i915_vma *vma = i915_gem_obj_to_ggtt(obj); if (vma) list_move_tail(&vma->mm_list, &dev_priv->gtt.base.inactive_list); @@ -4972,3 +4971,17 @@ i915_gem_inactive_scan(struct shrinker *shrinker, struct shrink_control *sc) mutex_unlock(&dev->struct_mutex); return freed; } + +struct i915_vma *i915_gem_obj_to_ggtt(struct drm_i915_gem_object *obj) +{ + struct i915_vma *vma; + + if (WARN_ON(list_empty(&obj->vma_list))) + return NULL; + + vma = list_first_entry(&obj->vma_list, typeof(*vma), vma_link); + if (WARN_ON(vma->vm != obj_to_ggtt(obj))) + return NULL; + + return vma; +}