linux-kernel - [PATCH v10 02/10] x86/resctrl: Add SDCIAE feature in the command line options

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Message-ID: <490b84c9723027d4e7e4cf0018a6e472a2900469.1761090859.git.babu.moger@amd.com>
Date: Tue, 21 Oct 2025 18:54:45 -0500
From: Babu Moger <babu.moger@....com>
To: <tony.luck@...el.com>, <reinette.chatre@...el.com>, <tglx@...utronix.de>,
	<mingo@...hat.com>, <bp@...en8.de>, <dave.hansen@...ux.intel.com>
CC: <corbet@....net>, <Dave.Martin@....com>, <james.morse@....com>,
	<babu.moger@....com>, <x86@...nel.org>, <hpa@...or.com>,
	<akpm@...ux-foundation.org>, <paulmck@...nel.org>, <rdunlap@...radead.org>,
	<pmladek@...e.com>, <kees@...nel.org>, <arnd@...db.de>, <fvdl@...gle.com>,
	<seanjc@...gle.com>, <pawan.kumar.gupta@...ux.intel.com>, <xin@...or.com>,
	<thomas.lendacky@....com>, <sohil.mehta@...el.com>, <jarkko@...nel.org>,
	<chang.seok.bae@...el.com>, <ebiggers@...gle.com>,
	<elena.reshetova@...el.com>, <ak@...ux.intel.com>,
	<mario.limonciello@....com>, <perry.yuan@....com>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<peternewman@...gle.com>
Subject: [PATCH v10 02/10] 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: Babu Moger <babu.moger@....com>
Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
---
v10: Changelog update.
     Fixed the few conflicts due to recent ABMC feature merge.

v9: Minor changelog update.
    Fixed the tabs in SMBA and BMEC lines.

v8: Updated Documentation/filesystems/resctrl.rst.

v7: No changes.

v6: No changes.

v5: No changes.

v4: No changes.

v3: No changes.

v2: No changes.
---
 .../admin-guide/kernel-parameters.txt         |  2 +-
 Documentation/filesystems/resctrl.rst         | 23 ++++++++++---------
 arch/x86/kernel/cpu/resctrl/core.c            |  2 ++
 3 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 6c42061ca20e..29db32a86815 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -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
 
diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst
index b7f35b07876a..d7a51cae6b26 100644
--- a/Documentation/filesystems/resctrl.rst
+++ b/Documentation/filesystems/resctrl.rst
@@ -17,17 +17,18 @@ 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"
-CQM (Cache QoS Monitoring)			"cqm_llc", "cqm_occup_llc"
-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) ""
-===============================================	================================
+=============================================================== ================================
+RDT (Resource Director Technology) Allocation			"rdt_a"
+CAT (Cache Allocation Technology)				"cat_l3", "cat_l2"
+CDP (Code and Data Prioritization)				"cdp_l3", "cdp_l2"
+CQM (Cache QoS Monitoring)					"cqm_llc", "cqm_occup_llc"
+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)			""
+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
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 06ca5a30140c..2b2935b3df8d 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -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)
 
-- 
2.34.1