[Bug 111699] [CI][BAT]igt at gem_exec_suspend@basic-s4-devices - fail - Failed assertion: !"GPU hung"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111699

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
Correlates with

<3> [90.027305] DMAR: DRHD: handling fault status reg 2
<3> [90.027363] DMAR: [DMA Write] Request device [00:02.0] fault addr 43000
[fault reason 07] Next page table ptr is invalid

In the GPU hang, it dies on MI_BATCH_BUFFER_END and doesn't return execution to
the ring. I presume that's when the lookup failed.

DMA_FADDR: 0x00000000_00013870

didn't cross a page so what it was looking up that failed is a mystery.

"fault addr 43000" looks to be a reference to BBADDR: 0x00000000_00042fd4
But write? gem_exec_suspend does use a scratch page to verify HW works across
suspend (using MI_STORE_DWORD_IMM), so probably that's the page that is absent.

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