[Intel-gfx] [PATCH 2/2] drm/i915/selftests: Exercise resetting in the middle of a wait-on-fence

[Matthew Auld]

On 19 July 2018 at 20:47, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> On older HW, gen2/3, fence registers are used for detiling GPU commands
> and as such changing those registers requires serialisation with the
> requests on the GPU. Anything running on the GPU is subject to a hang,
> and so we must be able to recover cleanly in the middle of a stuck wait
> on a fence register.
>
> We can simulate using the fence on the GPU simply by marking the fence
> as active on the request for this vma, the interface being common to all
> gen, thus broadening the test.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld at intel.com>