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Work around a firmware bug in the uncore PMU driver,

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affecting certain Intel systems.
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'perf-urgent-2023-09-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 perf event fix from Ingo Molnar:
 "Work around a firmware bug in the uncore PMU driver, affecting certain
  Intel systems"

* tag 'perf-urgent-2023-09-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/uncore: Correct the number of CHAs on EMR
This commit is contained in:
Linus Torvalds 2023-09-10 10:34:46 -07:00
commit e79dbf03d8
1 changed files with 11 additions and 1 deletions
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12
arch/x86/events/intel/uncore_snbep.c
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@ -6474,8 +6474,18 @@ void spr_uncore_cpu_init(void)
type = uncore_find_type_by_id(uncore_msr_uncores, UNCORE_SPR_CHA);
if (type) {
/*
* The value from the discovery table (stored in the type->num_boxes
* of UNCORE_SPR_CHA) is incorrect on some SPR variants because of a
* firmware bug. Using the value from SPR_MSR_UNC_CBO_CONFIG to replace it.
*/
rdmsrl(SPR_MSR_UNC_CBO_CONFIG, num_cbo);
type->num_boxes = num_cbo;
/*
* The MSR doesn't work on the EMR XCC, but the firmware bug doesn't impact
* the EMR XCC. Don't let the value from the MSR replace the existing value.
*/
if (num_cbo)
type->num_boxes = num_cbo;
}
spr_uncore_iio_free_running.num_boxes = uncore_type_max_boxes(uncore_msr_uncores, UNCORE_SPR_IIO);
}