[PATCH 2/3] drm/nouveau: slowpath for pushbuf ioctl

[Maarten Lankhorst]

Op 05-11-2019 om 12:04 schreef Daniel Vetter:
> On Mon, Nov 04, 2019 at 06:38:00PM +0100, Daniel Vetter wrote:
>> We can't copy_*_user while holding reservations, that will (soon even
>> for nouveau) lead to deadlocks. And it breaks the cross-driver
>> contract around dma_resv.
>>
>> Fix this by adding a slowpath for when we need relocations, and by
>> pushing the writeback of the new presumed offsets to the very end.
>>
>> Aside from "it compiles" entirely untested unfortunately.
>>
>> Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
>> Cc: Ilia Mirkin <imirkin at alum.mit.edu>
>> Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
>> Cc: Ben Skeggs <bskeggs at redhat.com>
>> Cc: nouveau at lists.freedesktop.org
> Ping for ack/review so I can land this entire series. intel-gfx-ci is all
> happy with the rebased version, so nouveau ack is the only hold-up here.

I don't feel confident reviewing this as I lack the hw, so all review caveats reply.

Having said that, this looks sane, and if it blows up we'll found out eventually. :)

Reviewed-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>