[Bug 112117] [CI][SHARDS] igt at gem_ctx_exec@basic-nohangcheck - fail - Failed assertion: gem_wait(i915, spin->handle, &timeout) == 0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112117

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit 2e0986a58cc4f2e7f9e7ede19ec32b9c116d0068
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Oct 23 14:31:07 2019 +0100

    drm/i915/gem: Cancel contexts when hangchecking is disabled

    Normally, we rely on our hangcheck to prevent persistent batches from
    hogging the GPU. However, if the user disables hangcheck, this mechanism
    breaks down. Despite our insistence that this is unsafe, the users are
    equally insistent that they want to use endless batches and will disable
    the hangcheck mechanism. We are looking at replacing hangcheck, in the
    next patch, with a softer mechanism, that sends a pulse down the engine
    to check if it is well. We can use the same preemptive pulse to flush an
    active context off the GPU upon context close, preventing resources
    being lost and unkillable requests remaining on the GPU after process
    termination.

    Testcase: igt/gem_ctx_exec/basic-nohangcheck
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
    Cc: Michał Winiarski <michal.winiarski at intel.com>
    Cc: Jon Bloomfield <jon.bloomfield at intel.com>
    Reviewed-by: Jon Bloomfield <jon.bloomfield at intel.com>
    Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20191023133108.21401-4-chris@chris-wilson.co.uk

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