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client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by MWH0EPF000A6733.mail.protection.outlook.com (10.167.249.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9846.18 via Frontend Transport; Fri, 24 Apr 2026 01:42:52 +0000 Received: from ruby-9651host.amd.com (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Thu, 23 Apr 2026 20:42:43 -0500 From: Babu Moger To: , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v2 7/8] x86,fs/resctrl: Add the resource for Global Slow Memory Bandwidth Allocation Date: Fri, 24 Apr 2026 01:41:37 +0000 Message-ID: X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: satlexmb07.amd.com (10.181.42.216) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MWH0EPF000A6733:EE_|IA4PR12MB9763:EE_ X-MS-Office365-Filtering-Correlation-Id: 1ec04213-3559-41a4-8dad-08dea1a2cd16 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|7416014|36860700016|82310400026|22082099003|18002099003|56012099003|20046099003; 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A GLBE control domain is a set of QoS (L3) domains that are grouped together for global bandwidth allocation; GLSBE reuses those same control domains. Add the resource definition for GLSBE in the resctrl filesystem so administrators can configure and manage slow-memory bandwidth at GLSBE control domain granularity: The GLSBE control domain is aligned to the system's NPS (Nodes Per Socket) configuration. Because RDT_RESOURCE_GSMBA uses the RESCTRL_NPS_NODE scope, updates routed through resctrl_arch_update_domains() already flow into resctrl_arch_update_nps(), which programs MSR_IA32_GSMBA_BW_BASE on one CPU per L3 within the domain. The schemata identifier is named GSMBA (Global Slow Memory Bandwidth Allocation) to mirror SMBA; the architecturally documented name GLSBE is used only in CPUID references. Signed-off-by: Babu Moger --- v2: Rewrite commit log to describe GSMBA and NPS scope. --- 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 f3ff11ca03f2..83e042caa080 100644 --- a/arch/x86/include/asm/msr-index.h +++ b/arch/x86/include/asm/msr-index.h @@ -1294,6 +1294,7 @@ #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 667ff3eb57f5..9a78a59f1929 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_NPS_NODE, + .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; } @@ -979,6 +991,19 @@ 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; @@ -1017,6 +1042,9 @@ static __init bool get_rdt_alloc_resources(void) if (get_slow_mem_config()) ret = true; + if (get_gslow_mem_config()) + ret = true; + return ret; } @@ -1120,6 +1148,9 @@ 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 22bbc5fa520d..217055aaf5c7 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/SMBA/GMBA resource\n"); + r->rid == RDT_RESOURCE_SMBA || r->rid == RDT_RESOURCE_GSMBA)) { + rdt_last_cmd_puts("Cannot pseudo-lock MBA/SMBA/GMBA/GSMBA resource\n"); return -EINVAL; } diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c index cc14c04314fe..761cc9cff4db 100644 --- a/fs/resctrl/rdtgroup.c +++ b/fs/resctrl/rdtgroup.c @@ -1413,7 +1413,7 @@ 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) { @@ -1619,7 +1619,8 @@ 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); @@ -2172,7 +2173,7 @@ 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 && @@ -2189,6 +2190,11 @@ 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; @@ -2405,6 +2411,7 @@ 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; @@ -3658,7 +3665,8 @@ 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 ed09ed2e0477..cd374f0d31db 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 */ -- 2.43.0