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

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
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         | 21 ++++++++++---------
 arch/x86/kernel/cpu/resctrl/core.c            |  2 ++
 3 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 747a55abf494..398136902e23 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -6154,7 +6154,7 @@
 	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/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst
index c7949dd44f2f..4866a8a4189f 100644
--- a/Documentation/filesystems/resctrl.rst
+++ b/Documentation/filesystems/resctrl.rst
@@ -17,16 +17,17 @@ 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) ""
-===============================================	================================
+=============================================================== ================================
+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)			""
+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 187d527ef73b..f6d84882cc4e 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -707,6 +707,7 @@ enum {
 	RDT_FLAG_MBA,
 	RDT_FLAG_SMBA,
 	RDT_FLAG_BMEC,
+	RDT_FLAG_SDCIAE,
 };
 
 #define RDT_OPT(idx, n, f)	\
@@ -732,6 +733,7 @@ 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

Hi Babu,

On 9/2/25 3:41 PM, Babu Moger wrote:
> Add the command line option to enable or disable the new resctrl feature
> L3 Smart Data Cache Injection Allocation Enforcement (SDCIAE).

Since SDCIAE is the architecture specific feature while the generic resctrl feature
is "io_alloc" I think it will be more accurate to say something similar to the
ABMC changelog:
	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@amd.com>
> ---

With changelog change:

| Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>

Reinette

Hi Reinette,

On 9/18/2025 12:09 AM, Reinette Chatre wrote:
> Hi Babu,
> 
> On 9/2/25 3:41 PM, Babu Moger wrote:
>> Add the command line option to enable or disable the new resctrl feature
>> L3 Smart Data Cache Injection Allocation Enforcement (SDCIAE).
> 
> Since SDCIAE is the architecture specific feature while the generic resctrl feature
> is "io_alloc" I think it will be more accurate to say something similar to the
> ABMC changelog:
> 	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.
> 

Sure.

>>
>> Signed-off-by: Babu Moger <babu.moger@amd.com>
>> ---
> 
> With changelog change:
> 
> | Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
> 

Thanks
Babu