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| author | Boris Brezillon <boris.brezillon@collabora.com> | 2019-05-29 09:51:21 +0300 |
|---|---|---|
| committer | Rob Herring <robh@kernel.org> | 2019-06-10 18:14:01 +0300 |
| commit | be7d9f05c53e6fc88525f8e55cf2dae937761799 (patch) | |
| tree | c0fb452c203168f200831d604b62712d9f03610e /drivers | |
| parent | 652b8b086538c8a10de5aa5cbdaef79333b46358 (diff) | |
| download | linux-be7d9f05c53e6fc88525f8e55cf2dae937761799.tar.xz | |
drm/gem_shmem: Use a writecombine mapping for ->vaddr
Right now, the BO is mapped as a cached region when ->vmap() is called
and the underlying object is not a dmabuf.
Doing that makes cache management a bit more complicated (you'd need
to call dma_map/unmap_sg() on the ->sgt field everytime the BO is about
to be passed to the GPU/CPU), so let's map the BO with writecombine
attributes instead (as done in most drivers).
Fixes: 2194a63a818d ("drm: Add library for shmem backed GEM objects")
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190529065121.13485-1-boris.brezillon@collabora.com
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/drm_gem_shmem_helper.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index 1ee208c2c85e..472ea5d81f82 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -255,7 +255,8 @@ static void *drm_gem_shmem_vmap_locked(struct drm_gem_shmem_object *shmem) if (obj->import_attach) shmem->vaddr = dma_buf_vmap(obj->import_attach->dmabuf); else - shmem->vaddr = vmap(shmem->pages, obj->size >> PAGE_SHIFT, VM_MAP, PAGE_KERNEL); + shmem->vaddr = vmap(shmem->pages, obj->size >> PAGE_SHIFT, + VM_MAP, pgprot_writecombine(PAGE_KERNEL)); if (!shmem->vaddr) { DRM_DEBUG_KMS("Failed to vmap pages\n"); |