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

[Rob Clark]

On Sat, Aug 1, 2015 at 1:16 PM, Emil Velikov <emil.l.velikov at gmail.com> 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 ?

well, I guess we can punt on this one.. it seems kind of asymmetrical
to the get_handle API to not support the various different sorts of
handles..  But I still end up running into problems, since I end up
with two different 'fd_device' instances (so two sets of hashtables to
track already-imported-handles/etc) between the ddx code and xa
(gallium)..

In the end just using -modesetting+glamor seems like an easier fix..

> Thanks
> Emil