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linux/drivers/gpu
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Chris Wilson fb6f0b64e4 drm/i915: Prevent machine hang from Broxton's vtd w/a and error capture 
Since capturing the error state requires fiddling around with the GGTT
to read arbitrary buffers and is itself run under stop_machine(), it
deadlocks the machine (effectively a hard hang) when run in conjunction
with Broxton's VTd workaround to serialize GGTT access.

v2: Store the ERR_PTR in first_error so that the error can be reported
to the user via sysfs.
v3: Mention the quirk in dmesg (using info as per usual)

Fixes: 0ef34ad622 ("drm/i915: Serialize GTT/Aperture accesses on BXT")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jon Bloomfield <jon.bloomfield@intel.com>
Cc: John Harrison <john.C.Harrison@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181102161232.17742-5-chris@chris-wilson.co.uk
2018-11-19 17:16:44 +00:00
..
drm drm/i915: Prevent machine hang from Broxton's vtd w/a and error capture 2018-11-19 17:16:44 +00:00
host1x gpu: host1x: Detach Host1x from IOMMU DMA domain on arm32 2018-09-26 17:11:14 +02:00
ipu-v3 drm pull for 4.19-rc1 2018-08-15 17:39:07 -07:00
vga ALSA: hda - Enable runtime PM only for discrete GPU 2018-09-13 17:58:30 +02:00
Makefile