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drm/i915: Use CPU mapping for userspace dma-buf mmap()

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Userspace is the one in charge of flush CPU by wrapping mmap with
begin{,end}_cpu_access.

v2: Remove LLC check cause we have dma-buf sync providers now. Also, fix return
before transferring ownership when mmap fails.
v3: Fix return values.
v4: !obj->base.filp is user triggerable, so removed the WARN_ON.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Tiago Vignatti <tiago.vignatti@intel.com>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1450820214-12509-6-git-send-email-tiago.vignatti@intel.com
This commit is contained in:
Tiago Vignatti 2015-12-22 19:36:48 -02:00 committed by Daniel Vetter
parent 346400c801
commit 2dbf0d9097
1 changed files with 17 additions and 1 deletions
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18
drivers/gpu/drm/i915/i915_gem_dmabuf.c
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@ -193,7 +193,23 @@ static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_n
static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
{
return -EINVAL;
struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
int ret;
if (obj->base.size < vma->vm_end - vma->vm_start)
return -EINVAL;
if (!obj->base.filp)
return -ENODEV;
ret = obj->base.filp->f_op->mmap(obj->base.filp, vma);
if (ret)
return ret;
fput(vma->vm_file);
vma->vm_file = get_file(obj->base.filp);
return 0;
}
static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction direction)