On Tue, Sep 24, 2013 at 09:57:57AM -0700, Ben Widawsky wrote:
> "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.gb7...@nuc-i3427.alporthouse.com>
>
> Reviewed-by: Chris Wilson <ch...@chris-wilson.co.uk>
> Signed-off-by: Ben Widawsky <b...@bwidawsk.net>
> ---
> 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
Bikeshed police: obj_to_gtt should probably be a static inline function
and also might need a bit a prefix now ...
-Daniel
>
> /* 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
>
> _______________________________________________
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> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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