Hi,
On 09/02/2021 11:37, Chiou, Cooper wrote:
From this CI warning log, there are all known warning message in i915
driver and is not caused by my patch.
Warning 1:
<3> [69.081809] [drm:wa_verify [i915]] *ERROR* engine workaround lost on
application! (reg[b004]=0x0, relevant bits were 0x0 vs expected 0x80)
Warning 2:
<3> [619.188270] i915/intel_lrc_live_selftests: live_lrc_isolation
failed with error -22
Warning 3:
<3> [282.248111] i915 0000:00:02.0: [drm] *ERROR* CPU pipe A FIFO underrun
This one:
igt@i915_pm_rpm@module-reload:
fi-cfl-8109u: PASS -> DMESG-WARN +35 similar issues
<3> [198.221812] [drm:wa_verify [i915]] *ERROR* engine workaround lost on
application! (reg[b004]=0x0, relevant bits were 0x0 vs expected 0x80)
<3> [198.222751] [drm:wa_verify [i915]] *ERROR* engine workaround lost on
application! (reg[b118]=0x0, relevant bits were 0x0 vs expected 0x200000)
<3> [198.223076] [drm:wa_verify [i915]] *ERROR* engine workaround lost on
application! (reg[b11c]=0x0, relevant bits were 0x0 vs expected 0x4)
?
CI does not think they are old warnings and registers are the MCR affected
range. So more digging would be needed to be sure. You are saying those happen
in our CI without the patch?
Then with regards to the reported perf drop - something to check would be if
the CML system you tested on has the same slice/subslice config as the one from
which the original report originated. Might be hard if the test farm has been
re-configured. But essentially running the benchmark on a few Gen9 machine with
fused ss would be needed I think.
And finally I couldn't find the WA entry in bspec, but maybe I just don't know
where to look. Someone better versed to finding WA. Maybe Matt you would have
time for a quick check if WaProgramMgsrForCorrectSliceSpecificMmioReads is
documented as applicable to Gen9?
Regards,
Tvrtko
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