[PATCH v4] dma-buf: Add ioctls to allow userspace to flush

Daniel Vetter daniel at ffwll.ch
Wed Aug 26 07:51:18 PDT 2015

On Wed, Aug 26, 2015 at 11:32:30AM -0300, Tiago Vignatti wrote:
> On 08/26/2015 09:58 AM, Daniel Vetter wrote:
> >The other is that right now there's no user nor implementation in sight
> >which actually does range-based flush optimizations, so I'm pretty much
> >expecting we'll get it wrong. Maybe instead we should go one step further
> >and remove the range from the internal dma-buf interface and also drop it
> >from the ioctl? With the flags we can always add something later on once
> >we have a real user with a clear need for it. But afaik cros only wants to
> >shuffle around entire tiles and has a buffer-per-tile approach.
> Thomas, I think Daniel has a point here and also, I wouldn't mind removing
> all range control from the dma-buf ioctl either.

if we go with nuking it from the ioctl I'd suggest to also nuke it from
the dma-buf internal inferface first too.
Daniel Vetter
Software Engineer, Intel Corporation

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