Re: [RFC] GPU reset notification interface

Daniel Vetter
2012-07-18T16:42:47Z

On Wed, Jul 18, 2012 at 6:36 PM, Adam Jackson <ajax@redhat.com> wrote:
> On Wed, 2012-07-18 at 09:23 -0700, Ian Romanick wrote:
>> On 07/18/2012 02:20 AM, Daniel Vetter wrote:
>> > A few things:
>> > - I agree with Chris that reset_in_progress should go, if userspace can
>> > sneak in and witness a reset event, we have a bug in the kernel. Since
>> > very recently, we actually have a few bugs less in that area ;-)
>>
>> I'm operating under the assumption that, from user space's perspective,
>> resets are not instantaneous. If resets are instantaneous, that may
>> change things.
>
> Do they need to be instantaneous, or do they merely need to be
> atomic-and-reasonably-quick? Could just block new ioctl submission
> until the reset completes.

That's actually what we already do, that "block ioctls until reset
completes thing" ;-)
-Daniel
--
Daniel Vetter
daniel.vetter@ffwll.ch - +41 (0) 79 364 57 48 - http://blog.ffwll.ch