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x86/resctrl: Add SDCIAE feature in the command line options

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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>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://patch.msgid.link/c623edf7cb369ba9da966de47d9f1b666778a40e.1762995456.git.babu.moger@amd.com
This commit is contained in:
Babu Moger 2025-11-12 18:57:28 -06:00 committed by Borislav Petkov (AMD)
parent 3767def18f
commit 4d4840b125
3 changed files with 15 additions and 12 deletions
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2
Documentation/admin-guide/kernel-parameters.txt
View File

@ -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

23
Documentation/filesystems/resctrl.rst
View File

@ -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

2
arch/x86/kernel/cpu/resctrl/core.c
View File

@ -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)