linux-kernel - [PATCH v6 2/8] x86/resctrl: Add SDCIAE feature in the command line options

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Message-ID: <22176f481564e2fea9936592f0adc6824efe2edf.1749677012.git.babu.moger@amd.com>
Date: Wed, 11 Jun 2025 16:23:27 -0500
From: Babu Moger <babu.moger@....com>
To: <babu.moger@....com>, <corbet@....net>, <tony.luck@...el.com>,
	<reinette.chatre@...el.com>, <Dave.Martin@....com>, <james.morse@....com>,
	<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
	<dave.hansen@...ux.intel.com>
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Subject: [PATCH v6 2/8] x86/resctrl: Add SDCIAE feature in the command line options

Add the command line options to enable or disable the new resctrl feature
L3 Smart Data Cache Injection Allocation Enforcement (SDCIAE).

Signed-off-by: Babu Moger <babu.moger@....com>
---
v6: No changes.

v5: No changes.

v4: No changes.

v3: No changes.

v2: No changes.
---
 Documentation/admin-guide/kernel-parameters.txt | 2 +-
 arch/x86/kernel/cpu/resctrl/core.c              | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index f1f2c0874da9..95d89f881e10 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -6066,7 +6066,7 @@
 	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, sdciae.
 			E.g. to turn on cmt and turn off mba use:
 				rdt=cmt,!mba
 
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 7109cbfcad4f..326c679ade5c 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -705,6 +705,7 @@ enum {
 	RDT_FLAG_MBA,
 	RDT_FLAG_SMBA,
 	RDT_FLAG_BMEC,
+	RDT_FLAG_SDCIAE,
 };
 
 #define RDT_OPT(idx, n, f)	\
@@ -730,6 +731,7 @@ 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_SDCIAE,    "sdciae",	X86_FEATURE_SDCIAE),
 };
 #define NUM_RDT_OPTIONS ARRAY_SIZE(rdt_options)
 
-- 
2.34.1