Quoting Kenneth Graunke (2018-01-04 19:38:05) > Geminilake requires the 3D driver to select whether barriers are > intended for compute shaders, or tessellation control shaders, by > whacking a "Barrier Mode" bit in SLICE_COMMON_ECO_CHICKEN1 when > switching pipelines. Failure to do this properly can result in GPU > hangs. > > Unfortunately, this means it needs to switch mid-batch, so only > userspace can properly set it. To facilitate this, the kernel needs > to whitelist the register. > > Signed-off-by: Kenneth Graunke <kenneth@xxxxxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > --- > drivers/gpu/drm/i915/i915_reg.h | 2 ++ > drivers/gpu/drm/i915/intel_engine_cs.c | 5 +++++ > 2 files changed, 7 insertions(+) > > Hello, > > We unfortunately need to whitelist an extra register for GPU hang fix > on Geminilake. Here's the corresponding Mesa patch: Thankfully it appears to be context saved. Has a w/a name been assigned for this? -Chris