On Oct 11, 2011 6:50 PM, "Jesse Barker" <jesse.barker@linaro.org> wrote:

On Mon, Oct 10, 2011 at 10:46 PM, Sumit Semwal <sumit.semwal@linaro.org> wrote:
> On 11 October 2011 01:45, Daniel Vetter <daniel@ffwll.ch> wrote:
>>
>> On Mon, Oct 10, 2011 at 10:06:09PM +0530, Sumit Semwal wrote:
>> > On 10 October 2011 02:13, Clark, Rob <rob@ti.com> wrote:
>> >
>> > > hmm, random though..
>> > >
>> > > should we define CPU_PREP/CPU_FINI type ioctl's?
>> > >
>> > > At least in the GStreamer case, we could cache the userspace mmap'ing,
>> > > and use the extra ioctls so the kernel side would know when cache
>> > > clean/invalidate is needed.  That would be a bit more efficient than
>> > > forcing userspace to map/unmap all the time, and could hook into
>> > > sync-objects of the allocator in cases where you have CPU access after
>> > > GPU renders to a buffer..
>> > >
>> >
>> > So, you think we could post the RFC to upstream lists without this,
>> > mentioning it as the immediate next TODO item? Or is it essential to add
>> > it
>> > for v1 of RFC?
>>
>> I think th "That would be a bit more efficient than ..." is a dead
>> giveaway: Imo performance optimisation for future extensions ;-)
>>
>> Otherwise I'm pretty satisfied with what the patch currently looks like
>> now. I think the next step is to proof-of-concept actual use-cases. I'm
>> hoping to be able to help there by porting Dave Airlie's PRIME drm buffer
>> sharing work onto this (the necessary hw is already here to make something
>> work on i915). But I can't promise much, unfortunately - too much other
>> stuff going on.
>
> Thanks Rob and Daniel,
> I would then post out the RFC to the upstream lists today. [I would post to
> linux-arm-kernel, linux-kernel, linux-mm, dri-devel, linux-media. Any other
> lists that should be part of this post you reckon?

That's the set of lists we talked about in Budapest, so it seems safe
to run with that.  If someone comes up with an additional suggestion
afterwards, you can always forward it along.

cheers,
Jesse

> BR,
> ~Sumit.
>>
>> Yours, Daniel
>> --
>> Daniel Vetter
>> Mail: daniel@ffwll.ch
>> Mobile: +41 (0)79 365 57 48
>
>
>
> --
>
> Thanks and regards,
>
> Sumit Semwal
>
> Linaro Kernel Engineer - Graphics working group
>
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