diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0586-drm-vc4-Fulfill-user-BO-creation-requests-from-the-k.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0586-drm-vc4-Fulfill-user-BO-creation-requests-from-the-k.patch | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0586-drm-vc4-Fulfill-user-BO-creation-requests-from-the-k.patch b/target/linux/brcm2708/patches-4.4/0586-drm-vc4-Fulfill-user-BO-creation-requests-from-the-k.patch new file mode 100644 index 0000000000..2dab022d12 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0586-drm-vc4-Fulfill-user-BO-creation-requests-from-the-k.patch @@ -0,0 +1,59 @@ +From 6b7250b2393653e5d08deed591b78b41a2ee8d43 Mon Sep 17 00:00:00 2001 +From: Eric Anholt <eric@anholt.net> +Date: Wed, 8 Feb 2017 15:00:54 -0800 +Subject: [PATCH] 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 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> +--- + drivers/gpu/drm/vc4/vc4_bo.c | 13 +++++++------ + 1 file changed, 7 insertions(+), 6 deletions(-) + +diff --git a/drivers/gpu/drm/vc4/vc4_bo.c b/drivers/gpu/drm/vc4/vc4_bo.c +index 56b779c..ce8a5fd 100644 +--- a/drivers/gpu/drm/vc4/vc4_bo.c ++++ b/drivers/gpu/drm/vc4/vc4_bo.c +@@ -208,22 +208,23 @@ 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; + int pass, ret; ++ 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; + } + + /* Otherwise, make a new BO. */ +-- +2.1.4 + |