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author | Eric Anholt <eric@anholt.net> | 2017-03-01 10:56:01 -0800 |
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committer | Eric Anholt <eric@anholt.net> | 2017-03-02 09:57:10 -0800 |
commit | eb981383ff74f109c72c8c94f4d63705d51cba20 (patch) | |
tree | 63fa939c720d4d206f765964f66cd021315d618c /drivers/gpu/drm/vc4 | |
parent | afc1ebf4562a14b8a981a0de2a3aa063dbd4c5b2 (diff) | |
download | op-kernel-dev-eb981383ff74f109c72c8c94f4d63705d51cba20.zip op-kernel-dev-eb981383ff74f109c72c8c94f4d63705d51cba20.tar.gz |
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
Diffstat (limited to 'drivers/gpu/drm/vc4')
-rw-r--r-- | drivers/gpu/drm/vc4/vc4_bo.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/gpu/drm/vc4/vc4_bo.c b/drivers/gpu/drm/vc4/vc4_bo.c index 7abcd9c..e5c7aa9 100644 --- a/drivers/gpu/drm/vc4/vc4_bo.c +++ b/drivers/gpu/drm/vc4/vc4_bo.c @@ -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); |