[Bug 106385] [GLK] GPU HANG: ecode 9:0:0xfffffffe, reason: hang on rcs0, bcs0, vcs0, vecs0, action: reset

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106385

--- Comment #12 from Chris Wilson <chris at chris-wilson.co.uk> ---
In the intel_iommu=igfx_off test, we got

[    0.000000] Linux version 4.17.0-rc3+ (root at amd1.blue.org) (gcc version
7.3.0 (GCC)) #5 SMP PREEMPT Fri May 4 08:44:22 CEST 2018
[    0.000000] Command line: \\k.efi rw drm.debug=0xf intel_iommu=igfx_off
initrd=\i.img
...
[    0.258015] DMAR: No ATSR found
[    0.258097] DMAR: dmar0: Using Queued invalidation
[    0.258107] DMAR: dmar1: Using Queued invalidation
[    0.258195] DMAR: Setting RMRR:
[    0.258282] DMAR: Setting identity map for device 0000:00:02.0 [0x5f800000 -
0x7fffffff]
...
[  207.804629] [drm] VT-d active for gfx access

Odd. So we didn't succeed in disabling iommu. Do you mind compiling out iommu
entirely to be sure we don't have a problem here with iommu+HWSP?

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