[Bug 110367] [CI][DRMTIP] igt at gem_exec_schedule@semaphore-user - warn - Failed assertion: !"GPU hung"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110367

--- Comment #5 from Martin Peres <martin.peres at free.fr> ---
(In reply to Chris Wilson from comment #2)
> commit bac24f59f45419a3853af2f58130cb82b7bdca64
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Fri Mar 29 13:40:24 2019 +0000
> 
>     drm/i915/execlists: Enable coarse preemption boundaries for gen8
>     
>     When we introduced preemption, we chose to keep it disabled for gen8 as
>     supporting preemption inside GPGPU user batches required various w/a in
>     userspace. Since then, the desire to preempt long queues of requests
>     between batches (e.g. within busywaiting semaphores) has grown. So allow
>     arbitration within the busywaits and between requests, but disable
>     arbitration within user batches so that we can preempt between requests
>     and not risk breaking GPGPU.
>     
>     However, since this preemption is much coarser and doesn't interfere
>     with userspace, we decline to include it amongst the scheduler
>     capabilities. (This is also required for us to skip over the preemption
>     selftests that expect to be able to preempt user batches.)
>     
>     Michal suggested that we could perhaps allow preemption inside gen8
>     userspace batches if we can satisfy ourselves that the default
>     preemption settings are viable with existing userspace (principally
>     OpenCL which already should carry any known workaround). We could then
>     merge the two code paths back into one, even dropping the artifical
>     has-preemption device feature flag.
>     
>     Testcase: igt/gem_exec_scheduler/semaphore-user
>     References: beecec901790 ("drm/i915/execlists: Preemption!")
>     Fixes: e88619646971 ("drm/i915: Use HW semaphores for inter-engine
> synchronisation on gen8+")
>     Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
>     Cc: Michal Winiarski <michal.winiarski at intel.com>
>     Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>     Reviewed-by: Michal Winiarski <michal.winiarski at intel.com> #irc
>     Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>     Link:
> https://patchwork.freedesktop.org/patch/msgid/20190329134024.5254-1-
> chris at chris-wilson.co.uk

Thanks, the bug was seen twice on one drmtip run, and not for the following 6
runs. This means we are over the 10x rule and can consider this fixed. Thanks!

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