[Bug 99671] [v4.10 snb] weird seqno/request tracking - HEAD overtakes TAIL

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99671

--- Comment #43 from Chris Wilson <chris at chris-wilson.co.uk> ---
Just documenting my continual failure here. Having run with DEBUG_GEM enabled,
you also showed that this assert doesn't fire:

void __i915_gem_request_submit(struct drm_i915_gem_request *request)
{
        GEM_BUG_ON(i915_seqno_passed(intel_engine_get_seqno(engine), seqno));
}

which is the scenario I was worrying about in comment 39. I still need to write
a test to see if the tail write goes backwards.

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