Nouveau - Aug 2022 - Advice about debugging nouveau driver suspend issue (init_on_alloc=1 and init_on_free=1)

On Thu, 2022-08-11 at 00:08 +0200, Karol Herbst wrote:
> the thing is, without this patch, the "hw path" fails with a
timeout
> of... 30 seconds?, the code falls back to sw and it takes up to 2-3
> minutes to finish up. So even if this solution is overkill, it fixes a
> real issue. I suspect _something_ is bonkers with the fencing we do
> here and we don't see that the stuff is actually finished or whatever,
> or maybe we never emit the fence in the first place.. I didn't dig
> deep enough.
> 
> With this, it's really quick and everything.
I guess with a todo comment this is probably fine then, since this would only
really be affecting GPUs using m2mf anyway

-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat

On Thu, Aug 11, 2022 at 11:20 PM Lyude Paul <lyude at redhat.com>
wrote:
>
> On Thu, 2022-08-11 at 00:08 +0200, Karol Herbst wrote:
> > the thing is, without this patch, the "hw path" fails with a
timeout
> > of... 30 seconds?, the code falls back to sw and it takes up to 2-3
> > minutes to finish up. So even if this solution is overkill, it fixes a
> > real issue. I suspect _something_ is bonkers with the fencing we do
> > here and we don't see that the stuff is actually finished or
whatever,
> > or maybe we never emit the fence in the first place.. I didn't dig
> > deep enough.
> >
> > With this, it's really quick and everything.
>
> I guess with a todo comment this is probably fine then, since this would
only
> really be affecting GPUs using m2mf anyway
>
I was mostly wondering if this is safe, but it probably is and it does
fix real user issues. I don't have a better solution at the moment
anyway.
> --
> Cheers,
>  Lyude Paul (she/her)
>  Software Engineer at Red Hat
>