Commit bebf57bf authored by Babu Moger's avatar Babu Moger Committed by Borislav Petkov (AMD)
Browse files

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



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: default avatarBabu Moger <babu.moger@amd.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: default avatarReinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/cover.1757108044.git.babu.moger@amd.com
parent e19c0621

Documentation/admin-guide/kernel-parameters.txt

+1 −1
Original line number Diff line number Diff line
@@ -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

Documentation/filesystems/resctrl.rst

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/x86/kernel/cpu/resctrl/core.c

+2 −0
Original line number Diff line number Diff line
@@ -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)