| Message ID | 1439422160-20148-5-git-send-email-tiago.vignatti@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, Aug 12, 2015 at 08:29:13PM -0300, Tiago Vignatti wrote: > 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. > > Signed-off-by: Tiago Vignatti <tiago.vignatti@intel.com> I have some reservations with CPU mmapping on !llc platforms, somehow we need to encourage creation of snooped bo (and proper usage thereof). However, the patches look good. Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> -Chris
diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c index 8447ba4..ecd00d6 100644 --- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c @@ -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, size_t start, size_t length, enum dma_data_direction direction)
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. Signed-off-by: Tiago Vignatti <tiago.vignatti@intel.com> --- drivers/gpu/drm/i915/i915_gem_dmabuf.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-)