Re: [PATCH 5/8] drm/i915: Uninterruptibly drain the timelines on unwedging

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Quoting Mika Kuoppala (2019-02-08 15:07:55)
> Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> 
> > Quoting Mika Kuoppala (2019-02-08 09:46:01)
> >> Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> >> 
> >> > On wedging, we mark all executing requests as complete and all pending
> >> > requests completed as soon as they are ready. Before unwedging though we
> >> > wish to flush those pending requests prior to restoring default
> >> > execution, and so we must wait. Do so interruptibly as we do not provide
> >> 
> >> uninterruptibly?
> >> 
> >> > the EINTR gracefully back to userspace in this case but persistent in
> >> 
> >> be persistent?
> >> 
> >> We lost the gracefullness due to not having the interruptible
> >> mutex wait on reset path anymore?
> >
> > No. We never had graceful handling, as we could never propagate the
> > EINTR from unwedge back to userspace so it became EIO instead.
> 
> Now I managed to entertain atleast myself.
> I try to find a deeper meaning so hard on this...
> 
> and there it is, in plain sight: the return code
> is not used. I really did read it before
> but obviously no rampup in powerstate was involved.

Exactly. A task for the future would be to use killable here, let the
user die and leave the machine wedged. But that requires a bit more
effort :)
-Chris
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