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x86/resctrl: Add ABMC feature in the command line options

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Add a kernel command-line parameter to enable or disable the exposure of
the ABMC (Assignable Bandwidth Monitoring Counters) hardware feature to
resctrl.

Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/cover.1757108044.git.babu.moger@amd.com
This commit is contained in:
Babu Moger
2025-09-05 16:34:05 -05:00
committed by Borislav Petkov (AMD)
parent e19c062199
commit bebf57bf05
3 changed files with 4 additions and 1 deletions
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2
Documentation/admin-guide/kernel-parameters.txt
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@@ -6155,7 +6155,7 @@
rdt= [HW,X86,RDT]
Turn on/off individual RDT features. List is:
cmt, mbmtotal, mbmlocal, l3cat, l3cdp, l2cat, l2cdp,
mba, smba, bmec.
mba, smba, bmec, abmc.
E.g. to turn on cmt and turn off mba use:
rdt=cmt,!mba

1
Documentation/filesystems/resctrl.rst
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@@ -26,6 +26,7 @@ MBM (Memory Bandwidth Monitoring) "cqm_mbm_total", "cqm_mbm_local"
MBA (Memory Bandwidth Allocation) "mba"
SMBA (Slow Memory Bandwidth Allocation) ""
BMEC (Bandwidth Monitoring Event Configuration) ""
ABMC (Assignable Bandwidth Monitoring Counters) ""
=============================================== ================================
Historically, new features were made visible by default in /proc/cpuinfo. This

2
arch/x86/kernel/cpu/resctrl/core.c
View File

@@ -711,6 +711,7 @@ enum {
RDT_FLAG_MBA,
RDT_FLAG_SMBA,
RDT_FLAG_BMEC,
RDT_FLAG_ABMC,
};
#define RDT_OPT(idx, n, f) \
@@ -736,6 +737,7 @@ static struct rdt_options rdt_options[] __ro_after_init = {
RDT_OPT(RDT_FLAG_MBA, "mba", X86_FEATURE_MBA),
RDT_OPT(RDT_FLAG_SMBA, "smba", X86_FEATURE_SMBA),
RDT_OPT(RDT_FLAG_BMEC, "bmec", X86_FEATURE_BMEC),
RDT_OPT(RDT_FLAG_ABMC, "abmc", X86_FEATURE_ABMC),
};
#define NUM_RDT_OPTIONS ARRAY_SIZE(rdt_options)