mirror of https://github.com/hak5/openwrt-owl.git
54 lines
1.6 KiB
Diff
54 lines
1.6 KiB
Diff
From cb8a5a1cf8cfd5b88fe641ada9a2dfb318d43c3f 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(-)
|
|
|
|
--- a/drivers/gpu/drm/vc4/vc4_bo.c
|
|
+++ b/drivers/gpu/drm/vc4/vc4_bo.c
|
|
@@ -208,21 +208,22 @@ struct drm_gem_object *vc4_create_object
|
|
}
|
|
|
|
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);
|