Add a kernel command-line parameter to enable or disable the exposure of
the ABMC (Assignable Bandwidth Monitoring Counters) hardware feature to
resctrl.
Signed-off-by: Babu Moger <babu.moger@amd.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
---
v18: No changes.
v17: No changes.
v16: Added Reviewed-by tag.
v15: No changes.
v14: Slight changelog modification.
v13: Removed the Reviewed-by as the file resctrl.rst is moved to
Documentation/filesystems/resctrl.rst. In that sense patch has changed.
v12: No changes.
v11: No changes.
v10: No changes.
v9: No code changes. Added Reviewed-by.
v8: Commit message update.
v7: No changes
v6: No changes
v5: No changes
v4: No changes
v3: No changes
v2: No changes
---
Documentation/admin-guide/kernel-parameters.txt | 2 +-
Documentation/filesystems/resctrl.rst | 1 +
arch/x86/kernel/cpu/resctrl/core.c | 2 ++
3 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 747a55abf494..5bab2eff81eb 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, abmc.
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..c97fd77a107d 100644
--- a/Documentation/filesystems/resctrl.rst
+++ b/Documentation/filesystems/resctrl.rst
@@ -26,6 +26,7 @@ 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) ""
=============================================== ================================
Historically, new features were made visible by default in /proc/cpuinfo. This
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index fbf019c1ff11..b07b12a05886 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -711,6 +711,7 @@ enum {
RDT_FLAG_MBA,
RDT_FLAG_SMBA,
RDT_FLAG_BMEC,
+ RDT_FLAG_ABMC,
};
#define RDT_OPT(idx, n, f) \
@@ -736,6 +737,7 @@ 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_ABMC, "abmc", X86_FEATURE_ABMC),
};
#define NUM_RDT_OPTIONS ARRAY_SIZE(rdt_options)
--
2.34.1