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linux/arch/x86/events
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Kan Liang 6f7f984fa8 perf/x86/uncore: Correct the number of CHAs on EMR 
Starting from SPR, the basic uncore PMON information is retrieved from
the discovery table (resides in an MMIO space populated by BIOS). It is
called the discovery method. The existing value of the type->num_boxes
is from the discovery table.

On some SPR variants, there is a firmware bug that makes the value from the
discovery table incorrect. We use the value from the
SPR_MSR_UNC_CBO_CONFIG MSR to replace the one from the discovery table:

   38776cc45e ("perf/x86/uncore: Correct the number of CHAs on SPR")

Unfortunately, the SPR_MSR_UNC_CBO_CONFIG isn't available for the EMR
XCC (Always returns 0), but the above firmware bug doesn't impact the
EMR XCC.

Don't let the value from the MSR replace the existing value from the
discovery table.

Fixes: 38776cc45e ("perf/x86/uncore: Correct the number of CHAs on SPR")
Reported-by: Stephane Eranian <eranian@google.com>
Reported-by: Yunying Sun <yunying.sun@intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Yunying Sun <yunying.sun@intel.com>
Link: https://lore.kernel.org/r/20230905134248.496114-1-kan.liang@linux.intel.com
2023-09-05 21:50:21 +02:00
..
amd perf/x86/ibs: Set mem_lvl_num, mem_remote and mem_hops for data_src 2023-07-26 12:28:45 +02:00
intel perf/x86/uncore: Correct the number of CHAs on EMR 2023-09-05 21:50:21 +02:00
zhaoxin x86/perf/zhaoxin: Add stepping check for ZXC 2023-02-11 11:18:12 +01:00
core.c perf/x86: Remove unused PERF_PMU_CAP_HETEROGENEOUS_CPUS capability 2023-07-26 12:28:46 +02:00
Kconfig perf/x86/Kconfig: Fix indentation in the Kconfig file 2022-05-25 15:54:26 +02:00
Makefile perf/x86: Move branch classifier 2022-08-27 00:05:44 +02:00
msr.c x86/cpu: Fix Gracemont uarch 2023-08-09 21:51:06 +02:00
perf_event_flags.h x86/perf: Assert all platform event flags are within PERF_EVENT_FLAG_ARCH 2022-09-07 21:54:01 +02:00
perf_event.h perf/x86/intel: Add Crestmont PMU 2023-08-09 21:51:07 +02:00
probe.c perf/x86/rapl: Add msr mask support 2021-02-10 14:44:54 +01:00
probe.h perf/x86/rapl: Add msr mask support 2021-02-10 14:44:54 +01:00
rapl.c x86/cpu: Fix Gracemont uarch 2023-08-09 21:51:06 +02:00
utils.c perf/x86/utils: Fix uninitialized var in get_branch_type() 2022-09-29 12:20:56 +02:00