linux-kernel - [PATCH 06/15] x86/resctrl: Add the mount option for ABMC feature

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Message-ID: <20231201005720.235639-7-babu.moger@amd.com>
Date:   Thu, 30 Nov 2023 18:57:11 -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 06/15] x86/resctrl: Add the mount option for ABMC feature

Add the mount option for ABMC (Assignable Bandwidth Monitoring Counters)
feature.

Signed-off-by: Babu Moger <babu.moger@....com>
---
 Documentation/arch/x86/resctrl.rst     | 2 ++
 arch/x86/kernel/cpu/resctrl/internal.h | 1 +
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 5 +++++
 3 files changed, 8 insertions(+)

diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index 1293cb6cba98..19e906f629d4 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -50,6 +50,8 @@ mount options are:
 "debug":
 	Make debug files accessible. Available debug files are annotated with
 	"Available only with debug option".
+"abmc":
+	Enable ABMC (Assignable Bandwidth Monitoring Counters) feature.
 
 L2 and L3 CDP are controlled separately.
 
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 0b22be85a444..b8f3a0b1ca41 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -56,6 +56,7 @@ struct rdt_fs_context {
 	bool				enable_cdpl3;
 	bool				enable_mba_mbps;
 	bool				enable_debug;
+	bool				enable_abmc;
 };
 
 static inline struct rdt_fs_context *rdt_fc2context(struct fs_context *fc)
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index feeb57ee7888..a4328e12a8f6 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2687,6 +2687,7 @@ enum rdt_param {
 	Opt_cdpl2,
 	Opt_mba_mbps,
 	Opt_debug,
+	Opt_abmc,
 	nr__rdt_params
 };
 
@@ -2695,6 +2696,7 @@ static const struct fs_parameter_spec rdt_fs_parameters[] = {
 	fsparam_flag("cdpl2",		Opt_cdpl2),
 	fsparam_flag("mba_MBps",	Opt_mba_mbps),
 	fsparam_flag("debug",		Opt_debug),
+	fsparam_flag("abmc",		Opt_abmc),
 	{}
 };
 
@@ -2723,6 +2725,9 @@ static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param)
 	case Opt_debug:
 		ctx->enable_debug = true;
 		return 0;
+	case Opt_abmc:
+		ctx->enable_abmc = true;
+		return 0;
 	}
 
 	return -EINVAL;
-- 
2.34.1