"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 <[email protected]> Reviewed-by: Chris Wilson <[email protected]> Signed-off-by: Ben Widawsky <[email protected]> --- drivers/gpu/drm/i915/i915_drv.h | 4 +++- drivers/gpu/drm/i915/i915_gem.c | 17 +++++++++++++++-- 2 files changed, 18 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 07de53c..67a31c2 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -2026,6 +2026,9 @@ 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) @@ -2062,7 +2065,6 @@ 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 8450724..6b134f0 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -3403,8 +3403,7 @@ 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); @@ -4940,3 +4939,17 @@ unsigned long i915_gem_obj_size(struct drm_i915_gem_object *o, return 0; } + +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; +} -- 1.8.4 _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
