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drm/vc4: Fulfill user BO creation requests from the kernel BO cache. 

The from_cache flag was actually "the BO is invisible to userspace",
so we can repurpose it to just zero out a cached BO and return it to
userspace.

Improves wall time for a loop of 5 glsl-algebraic-add-add-1 by
-1.44989% +/- 0.862891% (n=28, 1 outlier removed from each that
appeared to be other system noise)

Note that there's an intel-gpu-tools test to check for the proper
zeroing behavior here, which we continue to pass.

Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170301185602.6873-1-eric@anholt.net
This commit is contained in:
Eric Anholt 2017-03-01 10:56:01 -08:00
parent afc1ebf456
commit eb981383ff
1 changed files with 7 additions and 6 deletions
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13
drivers/gpu/drm/vc4/vc4_bo.c
View File

@ -211,21 +211,22 @@ struct drm_gem_object *vc4_create_object(struct drm_device *dev, size_t size)
}
struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t unaligned_size,
bool from_cache)
bool allow_unzeroed)
{
size_t size = roundup(unaligned_size, PAGE_SIZE);
struct vc4_dev *vc4 = to_vc4_dev(dev);
struct drm_gem_cma_object *cma_obj;
struct vc4_bo *bo;
if (size == 0)
return ERR_PTR(-EINVAL);
/* First, try to get a vc4_bo from the kernel BO cache. */
if (from_cache) {
struct vc4_bo *bo = vc4_bo_get_from_cache(dev, size);
if (bo)
return bo;
bo = vc4_bo_get_from_cache(dev, size);
if (bo) {
if (!allow_unzeroed)
memset(bo->base.vaddr, 0, bo->base.base.size);
return bo;
}
cma_obj = drm_gem_cma_create(dev, size);