On 01/11/2021 10:40, Joonas Lahtinen wrote:
Quoting Tvrtko Ursulin (2021-11-01 12:15:19)
On 25/10/2021 05:26, Cooper Chiou wrote:
This implements WaProgramMgsrForCorrectSliceSpecificMmioReads which
was omitted by mistake from Gen9 documentation, while it is actually
applicable to fused off parts.
Workaround consists of making sure MCR packet control register is
programmed to point to enabled slice/subslice pair before doing any
MMIO reads from the affected registers.
Failure do to this can result in complete system hangs when running
certain workloads. Two known cases which can cause system hangs are:
1. "test_basic progvar_prog_scope_uninit" test which is part of
Khronos OpenCL conformance suite
(https://github.com/KhronosGroup/OpenCL-CTS) with the Intel
OpenCL driver (https://github.com/intel/compute-runtime).
2. VP8 media hardware encoding using the full-feature build of the
Intel media-driver (https://github.com/intel/media-driver) and
ffmpeg.
For the former case patch was verified to fix the hard system hang
when executing the OCL test on Intel Pentium CPU 6405U which contains
fused off GT1 graphics.
Reference: HSD#1508045018,1405586840, BSID#0575
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>
Cc: William Tseng <william.tseng@xxxxxxxxx>
Cc: Shawn C Lee <shawn.c.lee@xxxxxxxxx>
Cc: Pawel Wilma <pawel.wilma@xxxxxxxxx>
Signed-off-by: Cooper Chiou <cooper.chiou@xxxxxxxxx>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Thanks for following through with all the testing and validation for the
patch!
Acked-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
I've pushed it, thanks!
Regards,
Tvrtko
