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SubjectRe: [Linaro-mm-sig] [RFC 1/2] dma-buf: Introduce dma buffer sharing mechanism
On Sat, Nov 26, 2011 at 8:00 AM, Daniel Vetter <> wrote:
> On Fri, Nov 25, 2011 at 17:28, Dave Airlie <> wrote:
>> I've rebuilt my PRIME interface on top of dmabuf to see how it would work,
>> I've got primed gears running again on top, but I expect all my object
>> lifetime and memory ownership rules need fixing up (i.e. leaks like a
>> sieve).
>> has the i915/nouveau patches for the kernel to produce the prime interface.
> I've noticed that your implementations for get_scatterlist (at least
> for the i915 driver) doesn't return the sg table mapped into the
> device address space. I've checked and the documentation makes it
> clear that this should be the case (and we really need this to support
> certain insane hw), but the get/put_scatterlist names are a bit
> misleading. Proposal:
> - use struct sg_table instead of scatterlist like you've already done
> in you branch. Simply more consistent with the dma api.


> - rename get/put_scatterlist into map/unmap for consistency with all
> the map/unmap dma api functions. The attachement would then serve as
> the abstract cookie to the backing storage, similar to how struct page
> * works as an abstract cookie for dma_map/unmap_page. The only special
> thing is that struct device * parameter because that's already part of
> the attachment.


> - add new wrapper functions dma_buf_map_attachment and
> dma_buf_unmap_attachement to hide all the pointer/vtable-chasing that
> we currently expose to users of this interface.

I thought that was one of the earlier comments on the initial dmabuf
patch, but either way: yup


> Comments?
> Cheers, Daniel
> --
> Daniel Vetter
> - +41 (0) 79 364 57 48 -
> --
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