On Fri, Oct 16, 2020 at 06:54:11PM +0100, Chris Wilson wrote: > MEDIA_STATE_VFE only accepts the 'maximum number of threads' in the > range [0, n-1] where n is #EU * (#threads/EU) with the number of threads > based on plaform and the number of EU based on the number of slices and > subslices. This is a fixed number per platform/gt, so appropriately > limit the number of threads we spawn to match the device. > > Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2024 > Fixes: 47f8253d2b89 ("drm/i915/gen7: Clear all EU/L3 residual contexts") > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk> > Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com> > Cc: Prathap Kumar Valsan <prathap.kumar.valsan at intel.com> > Cc: Akeem G Abodunrin <akeem.g.abodunrin at intel.com> > Cc: Balestrieri Francesco <francesco.balestrieri at intel.com> > Cc: Bloomfield Jon <jon.bloomfield at intel.com> > Cc: <stable at vger.kernel.org> # v5.7+ > --- > ... I tested this patch and found that it prevents the GPU hang I had reported on the HP Pavilion Mini 300-020 in https://gitlab.freedesktop.org/drm/intel/-/issues/2413. In more detail: I built linux-next at tag next-20201106 without the patch, and booted the result on an Ubuntu 20.04 base system. As expected, I observed the hang that I had previously reported as soon as Cinnnamon started when I entered graphical.target. I then applied this patch - that being the only change to my kernel - and I was able to boot to graphical.target 5 times consecutively without any GPU hang. You may add my endorsements: Tested-by: Randy Wright <rwright@xxxxxxx> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2413 Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2106 -- Randy Wright Hewlett Packard Enterprise Phone: (970) 898-0998 Mail: rwright@xxxxxxx
