[Mesa-stable] [PATCH] xa: add xa_surface_from_handle2

[Emil Velikov]

Hi all,

On 1 August 2015 at 20:40, Thomas Hellstrom <thellstrom at vmware.com> wrote:
> Hi!
>
> On 08/01/2015 07:16 PM, Emil Velikov wrote:
>> On 22 July 2015 at 00:00, Rob Clark <robdclark at gmail.com> wrote:
>>> From: Rob Clark <robclark at freedesktop.org>
>>>
>>> Like xa_surface_from_handle(), but takes a handle type, rather than
>>> hard-coding 'shared' handle.  This is needed to fix bugs seen with
>>> xf86-video-freedreno with xrandr rotation, for example.  The root issue
>>> is that doing a GEM_OPEN ioctl on a bo that already has a GEM handle
>>> associated with the drm_file will result in two unique handles for the
>>> same bo.  Which causes all sorts of follow-on fail.
>>>
>>> Cc: "10.5 10.6" <mesa-stable at lists.freedesktop.org>
>>> Signed-off-by: Rob Clark <robclark at freedesktop.org>
>>> ---
>>> Note: it would be good to get this in stable too, since I have a patch
>>> for xf86-video-freedreno which will depend on this.
>>>
>> Bth, I'm not too excited about having new APIs in the stable branch,
>> despite them being trivial as this one.
>> Regardless it would be nice to get a pair of eyes looking in this direction.
>>
>> The patch does exactly what it says on the tin, although I do wonder
>> if we should bump XA_TRACKER_VERSION_MINOR ?
>
> I haven't had time yet to look at the patch itself (I'm on vacation and
> back next week), but having XA recognize handle types, in particular
> dma-buf fds is, IMO a good thing.
>
> Regarding adding new interfaces to XA, the XA documentation is pretty
> explicit about how this should be handled and recognized, with version
> numbers. As long as all XA users follow this, it should be pretty
> straightforward also in a stable mesa branch. IIRC, the XA minor must be
> bumped in this case, and an out-of-mesa-tree user can't rely on the
> symbol being present, since an old libxatracker with the same major
> number might be present, but needs to use dlsym() or something similar.
>
Rob, Thomas do you plan on picking this up and addressing the final bits ?

-Emil