On Mon, Apr 29, 2019 at 4:38 PM Gerd Hoffmann kraxel@redhat.com wrote:
Hi,
More useful would be some way to signal this self-reimport capability to userspace somehow. See DRM_PRIME_CAP_LOCAL patch.
Userspace is supposed to test whether import/export works for a specific combo, not blindly assume it does and then keel over. I think we need to fix that, not add more flags - there's lots of reasons why a given pair of devices can't share buffers (e.g. all the contiguous allocations stuff on socs).
Ok. Lets scratch the DRM_PRIME_CAP_LOCAL idea then and blame userspace instead.
Right now I have the choice to set DRM_PRIME_CAP_{IMPORT,EXPORT}, in which case some userspace assumes it can do cross-driver export/import and trips over that not working. Or I do not set DRM_PRIME_CAP_{IMPORT,EXPORT}, which breaks DRI3 ...
Yeah that's not an option.
Good. Can I get an ack for this patch then, as it unbreaks DRI3 with qxl?
Oh sure, acked-by: me. Sorry forgot to supply that ... -Daniel