Commit 4d4840b1 authored by Babu Moger's avatar Babu Moger Committed by Borislav Petkov (AMD)
Browse files

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



Add a kernel command-line parameter to enable or disable the exposure of
the L3 Smart Data Cache Injection Allocation Enforcement (SDCIAE) 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://patch.msgid.link/c623edf7cb369ba9da966de47d9f1b666778a40e.1762995456.git.babu.moger@amd.com
parent 3767def1

Documentation/admin-guide/kernel-parameters.txt

+1 −1
Original line number Diff line number Diff line
@@ -6207,7 +6207,7 @@ 
	rdt=		[HW,X86,RDT]

			Turn on/off individual RDT features. List is:

			cmt, mbmtotal, mbmlocal, l3cat, l3cdp, l2cat, l2cdp,

			mba, smba, bmec, abmc.

			mba, smba, bmec, abmc, sdciae.

			E.g. to turn on cmt and turn off mba use:

				rdt=cmt,!mba

Documentation/filesystems/resctrl.rst

+12 −11
Original line number Diff line number Diff line
@@ -17,7 +17,7 @@ AMD refers to this feature as AMD Platform Quality of Service(AMD QoS). 
This feature is enabled by the CONFIG_X86_CPU_RESCTRL and the x86 /proc/cpuinfo

flag bits:



===============================================	================================

=============================================================== ================================

RDT (Resource Director Technology) Allocation			"rdt_a"

CAT (Cache Allocation Technology)				"cat_l3", "cat_l2"

CDP (Code and Data Prioritization)				"cdp_l3", "cdp_l2"
@@ -27,7 +27,8 @@ MBA (Memory Bandwidth Allocation) "mba" 
SMBA (Slow Memory Bandwidth Allocation)				""

BMEC (Bandwidth Monitoring Event Configuration)			""

ABMC (Assignable Bandwidth Monitoring Counters)			""

===============================================	================================

SDCIAE (Smart Data Cache Injection Allocation Enforcement)	""

=============================================================== ================================



Historically, new features were made visible by default in /proc/cpuinfo. This

resulted in the feature flags becoming hard to parse by humans. Adding a new

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

+2 −0
Original line number Diff line number Diff line
@@ -719,6 +719,7 @@ enum { 
	RDT_FLAG_SMBA,

	RDT_FLAG_BMEC,

	RDT_FLAG_ABMC,

	RDT_FLAG_SDCIAE,

};



#define RDT_OPT(idx, n, f)	\
@@ -745,6 +746,7 @@ static struct rdt_options rdt_options[] __ro_after_init = { 
	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),

	RDT_OPT(RDT_FLAG_SDCIAE,    "sdciae",	X86_FEATURE_SDCIAE),

};

#define NUM_RDT_OPTIONS ARRAY_SIZE(rdt_options)