On Thu, Apr 11, 2019 at 11:30:34AM +0300, Mika Kuoppala wrote: > On gen11 writing to read only ppgtt page causes a gpu hang. > This behaviour is different than with previous gen where > read only ppgtt access is supported. On those, the write > is just dropped without visible side effects. > > Disable ro ppgtt support on gen11 until a solution can > be found to bring it into line with its predecessors. > > References: HSDES#1807136187 > References: https://bugzilla.freedesktop.org/show_bug.cgi?id=108569 > Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > Signed-off-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx> > --- > drivers/gpu/drm/i915/i915_gem_gtt.c | 9 +++++++-- > 1 file changed, 7 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c > index 736c845eb77f..caae8cdafc1a 100644 > --- a/drivers/gpu/drm/i915/i915_gem_gtt.c > +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c > @@ -1548,8 +1548,13 @@ static struct i915_hw_ppgtt *gen8_ppgtt_create(struct drm_i915_private *i915) > > ppgtt_init(i915, ppgtt); > > - /* From bdw, there is support for read-only pages in the PPGTT. */ > - ppgtt->vm.has_read_only = true; > + /* > + * From bdw, there is hw support for read-only pages in the PPGTT. > + * > + * Gen11 has HSDES#:1807136187 unresolved. Disable ro support > + * for now. > + */ > + ppgtt->vm.has_read_only = INTEL_GEN(i915) != 11; I believe it is safest to use < 11, no?! > > /* There are only few exceptions for gen >=6. chv and bxt. > * And we are not sure about the latter so play safe for now. > -- > 2.17.1 > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/intel-gfx _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
