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Message-ID: <d712f52434d78d0ed14ffa22a1ffa4765f67cc3b.1769029977.git.babu.moger@amd.com>
Date: Wed, 21 Jan 2026 15:12:44 -0600
From: Babu Moger <babu.moger@....com>
To: <corbet@....net>, <tony.luck@...el.com>, <reinette.chatre@...el.com>,
<Dave.Martin@....com>, <james.morse@....com>, <babu.moger@....com>,
<tglx@...nel.org>, <mingo@...hat.com>, <bp@...en8.de>,
<dave.hansen@...ux.intel.com>
CC: <x86@...nel.org>, <hpa@...or.com>, <peterz@...radead.org>,
<juri.lelli@...hat.com>, <vincent.guittot@...aro.org>,
<dietmar.eggemann@....com>, <rostedt@...dmis.org>, <bsegall@...gle.com>,
<mgorman@...e.de>, <vschneid@...hat.com>, <akpm@...ux-foundation.org>,
<pawan.kumar.gupta@...ux.intel.com>, <pmladek@...e.com>,
<feng.tang@...ux.alibaba.com>, <kees@...nel.org>, <arnd@...db.de>,
<fvdl@...gle.com>, <lirongqing@...du.com>, <bhelgaas@...gle.com>,
<seanjc@...gle.com>, <xin@...or.com>, <manali.shukla@....com>,
<dapeng1.mi@...ux.intel.com>, <chang.seok.bae@...el.com>,
<mario.limonciello@....com>, <naveen@...nel.org>,
<elena.reshetova@...el.com>, <thomas.lendacky@....com>,
<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<kvm@...r.kernel.org>, <peternewman@...gle.com>, <eranian@...gle.com>,
<gautham.shenoy@....com>
Subject: [RFC PATCH 06/19] x86,fs/resctrl: Add the resource for Global Slow Memory Bandwidth Enforcement(GLSBE)
AMD PQoS Global Slow Bandwidth Enforcement (GLSBE) provides a mechanism
for software to specify bandwidth limits for groups of threads that span
multiple QoS Domains.
Add the resource definition Global Slow Memory Bandwidth Enforcement
to resctrl filesystem. Resource allows users to configure and manage
the global slow memory bandwidth allocation settings for GLBE control
domain.
Signed-off-by: Babu Moger <babu.moger@....com>
---
arch/x86/include/asm/msr-index.h | 1 +
arch/x86/kernel/cpu/resctrl/core.c | 31 ++++++++++++++++++++++++++++++
fs/resctrl/ctrlmondata.c | 4 ++--
fs/resctrl/rdtgroup.c | 16 +++++++++++----
include/linux/resctrl.h | 1 +
5 files changed, 47 insertions(+), 6 deletions(-)
diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index e9b21676102c..0ef1f6a8f4bc 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -1275,6 +1275,7 @@
#define MSR_IA32_L3_QOS_EXT_CFG 0xc00003ff
#define MSR_IA32_EVT_CFG_BASE 0xc0000400
#define MSR_IA32_GMBA_BW_BASE 0xc0000600
+#define MSR_IA32_GSMBA_BW_BASE 0xc0000680
/* AMD-V MSRs */
#define MSR_VM_CR 0xc0010114
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index b4468481d3bf..cd208cd71232 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -109,6 +109,15 @@ struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = {
.schema_fmt = RESCTRL_SCHEMA_RANGE,
},
},
+ [RDT_RESOURCE_GSMBA] =
+ {
+ .r_resctrl = {
+ .name = "GSMBA",
+ .ctrl_scope = RESCTRL_L3_CACHE,
+ .ctrl_domains = ctrl_domain_init(RDT_RESOURCE_GSMBA),
+ .schema_fmt = RESCTRL_SCHEMA_RANGE,
+ },
+ },
[RDT_RESOURCE_PERF_PKG] =
{
.r_resctrl = {
@@ -261,6 +270,9 @@ static __init bool __rdt_get_mem_config_amd(struct rdt_resource *r)
case RDT_RESOURCE_GMBA:
subleaf = 7;
break;
+ case RDT_RESOURCE_GSMBA:
+ subleaf = 8;
+ break;
default:
return false;
}
@@ -958,6 +970,19 @@ static __init bool get_slow_mem_config(void)
return false;
}
+static __init bool get_gslow_mem_config(void)
+{
+ struct rdt_hw_resource *hw_res = &rdt_resources_all[RDT_RESOURCE_GSMBA];
+
+ if (!rdt_cpu_has(X86_FEATURE_GSMBA))
+ return false;
+
+ if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
+ return __rdt_get_mem_config_amd(&hw_res->r_resctrl);
+
+ return false;
+}
+
static __init bool get_rdt_alloc_resources(void)
{
struct rdt_resource *r;
@@ -996,6 +1021,9 @@ static __init bool get_rdt_alloc_resources(void)
if (get_slow_mem_config())
ret = true;
+ if (get_gslow_mem_config())
+ ret = true;
+
return ret;
}
@@ -1099,6 +1127,9 @@ static __init void rdt_init_res_defs_amd(void)
} else if (r->rid == RDT_RESOURCE_SMBA) {
hw_res->msr_base = MSR_IA32_SMBA_BW_BASE;
hw_res->msr_update = mba_wrmsr_amd;
+ } else if (r->rid == RDT_RESOURCE_GSMBA) {
+ hw_res->msr_base = MSR_IA32_GSMBA_BW_BASE;
+ hw_res->msr_update = mba_wrmsr_amd;
}
}
}
diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c
index ad7327b90d3f..5c529de24612 100644
--- a/fs/resctrl/ctrlmondata.c
+++ b/fs/resctrl/ctrlmondata.c
@@ -247,8 +247,8 @@ static int parse_line(char *line, struct resctrl_schema *s,
if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
(r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_GMBA ||
- r->rid == RDT_RESOURCE_SMBA)) {
- rdt_last_cmd_puts("Cannot pseudo-lock MBA resource\n");
+ r->rid == RDT_RESOURCE_SMBA || r->rid == RDT_RESOURCE_GSMBA)) {
+ rdt_last_cmd_puts("Cannot pseudo-lock MBA/SMBA resource\n");
return -EINVAL;
}
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index d2eab9007cc1..fc034f4481e3 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -1423,7 +1423,7 @@ static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
list_for_each_entry(s, &resctrl_schema_all, list) {
r = s->res;
if (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_GMBA ||
- r->rid == RDT_RESOURCE_SMBA)
+ r->rid == RDT_RESOURCE_SMBA || r->rid == RDT_RESOURCE_GSMBA)
continue;
has_cache = true;
list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
@@ -1627,7 +1627,8 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
type);
if (r->rid == RDT_RESOURCE_MBA ||
r->rid == RDT_RESOURCE_GMBA ||
- r->rid == RDT_RESOURCE_SMBA)
+ r->rid == RDT_RESOURCE_SMBA ||
+ r->rid == RDT_RESOURCE_GSMBA)
size = ctrl;
else
size = rdtgroup_cbm_to_size(r, d, ctrl);
@@ -2187,7 +2188,7 @@ static struct rftype *rdtgroup_get_rftype_by_name(const char *name)
static void thread_throttle_mode_init(void)
{
enum membw_throttle_mode throttle_mode = THREAD_THROTTLE_UNDEFINED;
- struct rdt_resource *r_mba, *r_gmba, *r_smba;
+ struct rdt_resource *r_mba, *r_gmba, *r_smba, *r_gsmba;
r_mba = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
if (r_mba->alloc_capable &&
@@ -2204,6 +2205,11 @@ static void thread_throttle_mode_init(void)
r_smba->membw.throttle_mode != THREAD_THROTTLE_UNDEFINED)
throttle_mode = r_smba->membw.throttle_mode;
+ r_gsmba = resctrl_arch_get_resource(RDT_RESOURCE_GSMBA);
+ if (r_gsmba->alloc_capable &&
+ r_gsmba->membw.throttle_mode != THREAD_THROTTLE_UNDEFINED)
+ throttle_mode = r_gsmba->membw.throttle_mode;
+
if (throttle_mode == THREAD_THROTTLE_UNDEFINED)
return;
@@ -2420,6 +2426,7 @@ static unsigned long fflags_from_resource(struct rdt_resource *r)
case RDT_RESOURCE_MBA:
case RDT_RESOURCE_GMBA:
case RDT_RESOURCE_SMBA:
+ case RDT_RESOURCE_GSMBA:
return RFTYPE_RES_MB;
case RDT_RESOURCE_PERF_PKG:
return RFTYPE_RES_PERF_PKG;
@@ -3669,7 +3676,8 @@ static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp)
r = s->res;
if (r->rid == RDT_RESOURCE_MBA ||
r->rid == RDT_RESOURCE_GMBA ||
- r->rid == RDT_RESOURCE_SMBA) {
+ r->rid == RDT_RESOURCE_SMBA ||
+ r->rid == RDT_RESOURCE_GSMBA) {
rdtgroup_init_mba(r, rdtgrp->closid);
if (is_mba_sc(r))
continue;
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 17e12cd3befc..63d74c0dbb8f 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -54,6 +54,7 @@ enum resctrl_res_level {
RDT_RESOURCE_MBA,
RDT_RESOURCE_GMBA,
RDT_RESOURCE_SMBA,
+ RDT_RESOURCE_GSMBA,
RDT_RESOURCE_PERF_PKG,
/* Must be the last */
--
2.34.1
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