On Thu, Mar 30, 2017 at 04:05:58PM +0100, Chris Wilson wrote:
> One invariant on the order of requests on an engine is that they are
> monotonically increasing. Assert that when we check retirement on the
> ring that no request is more recent than the last submit request.
>
> Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Reviewed-by: Michał Winiarski <michal.winiar...@intel.com>
-Michał
> ---
> drivers/gpu/drm/i915/i915_gem_request.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_request.c
> b/drivers/gpu/drm/i915/i915_gem_request.c
> index 2cb2206b2f6b..2ce37e25f623 100644
> --- a/drivers/gpu/drm/i915/i915_gem_request.c
> +++ b/drivers/gpu/drm/i915/i915_gem_request.c
> @@ -1246,6 +1246,8 @@ static void engine_retire_requests(struct
> intel_engine_cs *engine)
> u32 seqno = intel_engine_get_seqno(engine);
> LIST_HEAD(retire);
>
> + GEM_BUG_ON(!i915_seqno_passed(intel_engine_last_submit(engine), seqno));
> +
> spin_lock_irq(&engine->timeline->lock);
> list_for_each_entry_safe(request, next,
> &engine->timeline->requests, link) {
> --
> 2.11.0
>
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