[Intel-gfx] [PATCH v2] drm/i915: Taint (TAINT_DIE) the kernel if the GPU reset fails

[Chris Wilson]

Quoting Chris Wilson (2017-11-29 14:05:33)
> History tells us that if we cannot reset the GPU now, we never will. This
> then impacts everything that is run subsequently. On failing the reset,
> we mark the driver as wedged, trying to prevent further execution on the
> GPU, forcing userspace to fallback to using the CPU to update its
> framebuffers and let the user know what happened.
> 
> We also want to go one step further and add a taint to the kernel so that
> any subsequent faults can be traced back to this failure. This is
> important for igt, where if the GPU/driver fails we want to reboot and
> restart testing rather than continue on into oblivion.
> 
> TAINT_DIE is colloquially known as "system on fire", which seems
> appropriate for unresponsive hardware.
> 
> v2: Also taint if the recovery fails (again history shows us that is
> typically fatal).
> 
> References: https://bugs.freedesktop.org/show_bug.cgi?id=103514
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> Cc: Michał Winiarski <michal.winiarski at intel.com>

irc
Acked-by: Tomi Sarvela <tomi.p.sarvela at intel.com>
-Chris