[RFC PATCH v3 02/17] x86/resctrl: Add ABMC feature in the command line options

Babu Moger
2024-03-29T01:07:16Z

Add the command line options to enable or disable the new resctrl feature
ABMC (Assignable Bandwidth Monitoring Counters).

Signed-off-by: Babu Moger <babu.moger@amd.com>

---
v3: No changes

v2: No changes
---
Documentation/admin-guide/kernel-parameters.txt | 2 +-
Documentation/arch/x86/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 bb884c14b2f6..b3a2e7f72462 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5551,7 +5551,7 @@
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/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index 6c245582d8fb..68df7751d1f5 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/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 83e40341583e..57a8c6f30dd6 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -664,6 +664,7 @@ enum {
RDT_FLAG_MBA,
RDT_FLAG_SMBA,
RDT_FLAG_BMEC,
+ RDT_FLAG_ABMC,
};

#define RDT_OPT(idx, n, f) \
@@ -689,6 +690,7 @@ static struct rdt_options rdt_options[] __initdata = {
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