[Bug 103484] SSEU status is all 0 on BXT

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103484

--- Comment #22 from Lionel Landwerlin <lionel.g.landwerlin at linux.intel.com> ---
(In reply to Lionel Landwerlin from comment #21)
> Chris suggests we move the igt test as a selftest in i915 for 3 reasons :
> 
> 1. ack registers are priveleged so must be read from kernel
> 2. need to read the value from command streamer because we need HW awake + a
> context scheduled (ack register values reflect the programmed value in
> context image)
> 3. there is some ongoing work to change powergating configuration
> dynamically and that will likely rely on heuristic in i915, which means
> userspace can probably only guess the value in the ack registers

I should add that the selftest should only verify the initial value programmed
is correct.

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