linux-kernel - [PATCH 04/15] x86/resctrl: Add ABMC feature in the command line options

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Message-ID: <20231201005720.235639-5-babu.moger@amd.com>
Date:   Thu, 30 Nov 2023 18:57:09 -0600
From:   Babu Moger <babu.moger@....com>
To:     <corbet@....net>, <fenghua.yu@...el.com>,
        <reinette.chatre@...el.com>, <tglx@...utronix.de>,
        <mingo@...hat.com>, <bp@...en8.de>, <dave.hansen@...ux.intel.com>
CC:     <x86@...nel.org>, <hpa@...or.com>, <paulmck@...nel.org>,
        <rdunlap@...radead.org>, <tj@...nel.org>, <peterz@...radead.org>,
        <seanjc@...gle.com>, <kim.phillips@....com>, <babu.moger@....com>,
        <jmattson@...gle.com>, <ilpo.jarvinen@...ux.intel.com>,
        <jithu.joseph@...el.com>, <kan.liang@...ux.intel.com>,
        <nikunj@....com>, <daniel.sneddon@...ux.intel.com>,
        <pbonzini@...hat.com>, <rick.p.edgecombe@...el.com>,
        <rppt@...nel.org>, <maciej.wieczor-retman@...el.com>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <eranian@...gle.com>, <peternewman@...gle.com>, <dhagiani@....com>
Subject: [PATCH 04/15] x86/resctrl: Add ABMC feature in the command line options

Add the command line options to enable or disable the new resctrl feature
ABMC (Assignable Bandwidth Monitoring Counters).

Signed-off-by: Babu Moger <babu.moger@....com>
---
 Documentation/admin-guide/kernel-parameters.txt | 2 +-
 Documentation/arch/x86/resctrl.rst              | 1 +
 arch/x86/kernel/cpu/resctrl/core.c              | 2 ++
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 65731b060e3f..59a9e486fbbf 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5475,7 +5475,7 @@
 	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
 
diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index a6279df64a9d..d816ded93c22 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -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
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 3fbae10b662d..a257017b4de5 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -678,6 +678,7 @@ enum {
 	RDT_FLAG_MBA,
 	RDT_FLAG_SMBA,
 	RDT_FLAG_BMEC,
+	RDT_FLAG_ABMC,
 };
 
 #define RDT_OPT(idx, n, f)	\
@@ -703,6 +704,7 @@ static struct rdt_options rdt_options[]  __initdata = {
 	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)
 
-- 
2.34.1