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| author | Ben Widawsky <benjamin.widawsky@intel.com> | 2013-09-24 09:57:57 -0700 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-10-01 07:45:21 +0200 |
| commit | 5c2abbeab798154166d42fce4f71790caa6dd9bc (patch) | |
| tree | 4f2232391cd39f6a9dc5887af634f1c045d6074e /drivers/gpu/drm/i915/i915_gem.c | |
| parent | bcccff847d1fdb53c2fae999a7f03facfa399bab (diff) | |
| download | talos-obmc-linux-5c2abbeab798154166d42fce4f71790caa6dd9bc.tar.gz talos-obmc-linux-5c2abbeab798154166d42fce4f71790caa6dd9bc.zip | |
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 <chris@chris-wilson.co.uk>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem.c | 17 |
1 files changed, 15 insertions, 2 deletions
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; +} |
