[Bug 99130] [IVB] CONFIG_PROVE_LOCKING=y causes igt/gem_exec/basic-wait-all (and possibly others) to fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99130

--- Comment #10 from Chris Wilson <chris at chris-wilson.co.uk> ---
[  154.074065] [drm:drm_ioctl] pid=2323, dev=0xe200, auth=1, I915_GEM_WAIT
[  154.074748] i915_gem_wait_ioctl: timeout 0.500000000 -> 0.499993351
[  154.075390] [drm:drm_ioctl] ret = -512
...
[  155.072528] [drm:drm_ioctl] pid=2323, dev=0xe200, auth=1, I915_GEM_WAIT
[  155.073234] i915_gem_wait_ioctl: timeout 0.488539596 -> 0.488535373
[  155.073916] [drm:drm_ioctl] ret = -512
[  155.074605] [drm:drm_ioctl] pid=2323, dev=0xe200, auth=1, I915_GEM_WAIT
[  155.075307] i915_gem_wait_ioctl: timeout 0.488535373 -> 0.488532529

Walltime of 1s, but actual wait time of ~12ms.

Each ioctl is taking ~1.4ms (inside drmIoctl) with a further interval of ~0.7ms
between ioctls. And we account for 3us.

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