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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>
This commit is contained in:
Ben Widawsky 2013-09-24 09:57:57 -07:00 committed by Daniel Vetter
parent bcccff847d
commit 5c2abbeab7
2 changed files with 18 additions and 3 deletions
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4
drivers/gpu/drm/i915/i915_drv.h
View File

@ -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);

17
drivers/gpu/drm/i915/i915_gem.c
View File

@ -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;
}