diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2017-11-30 18:07:02 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2020-02-11 00:16:15 +0000 |
| commit | cbc1f3cb67b6ec13182117a329b6f03810c03cf6 (patch) | |
| tree | a06004a50196379f78ae19fc9e9ff33f92fb1fbc /drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | |
| parent | 4746fd5c2c132225bdd817ddf04e8454e872f8c2 (diff) | |
| download | linux-cbc1f3cb67b6ec13182117a329b6f03810c03cf6.tar.bz2 | |
drm/i915: Skip CPU synchronisation on dmabuf attachments
dma-bufs are device coherent, with explicit CPU synchronisation provided
via the begin/end cpu access ioctls. As the coherency of the dma-buf is
explicitly defined to be under user control, flushing any caches on
attach/detach of the dma-buf is additional work that doesn't aide the
user in the slightest.
Suggested-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Dongwon Kim <dongwon.kim@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171130180702.29357-1-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c index 372b57ca0efc..7db5a793739d 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c @@ -48,7 +48,9 @@ static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachme src = sg_next(src); } - if (!dma_map_sg(attachment->dev, st->sgl, st->nents, dir)) { + if (!dma_map_sg_attrs(attachment->dev, + st->sgl, st->nents, dir, + DMA_ATTR_SKIP_CPU_SYNC)) { ret = -ENOMEM; goto err_free_sg; } @@ -71,7 +73,9 @@ static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, { struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf); - dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir); + dma_unmap_sg_attrs(attachment->dev, + sg->sgl, sg->nents, dir, + DMA_ATTR_SKIP_CPU_SYNC); sg_free_table(sg); kfree(sg); |