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Wed, 25 Mar 2026 00:12:09 +0000 From: Aaron Tomlin To: tony.luck@intel.com, reinette.chatre@intel.com, Dave.Martin@arm.com, james.morse@arm.com, babu.moger@amd.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com Cc: dave.martin@arm.com, sean@ashe.io, neelx@suse.com, mproche@gmail.com, chjohnst@gmail.com, linux-kernel@vger.kernel.org Subject: [PATCH v6 1/2] fs/resctrl: Report invalid domain ID when parsing io_alloc_cbm Date: Tue, 24 Mar 2026 20:11:58 -0400 Message-ID: <20260325001159.447075-2-atomlin@atomlin.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260325001159.447075-1-atomlin@atomlin.com> References: <20260325001159.447075-1-atomlin@atomlin.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: BLAPR03CA0157.namprd03.prod.outlook.com (2603:10b6:208:32f::27) To CWLP123MB3523.GBRP123.PROD.OUTLOOK.COM (2603:10a6:400:70::10) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CWLP123MB3523:EE_|LO2P123MB4078:EE_ X-MS-Office365-Filtering-Correlation-Id: ff11e5a7-8fc5-43d6-3677-08de8a0327c2 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|376014|366016|56012099003|18002099003|22082099003; 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charset="utf-8" The last_cmd_status file is intended to report details about the most recent resctrl filesystem operation, specifically to aid in diagnosing failures. However, when parsing io_alloc_cbm, if a user provides a domain ID that does not exist in the resource, the operation fails with -EINVAL without updating last_cmd_status. This results in inconsistent behaviour where the system call returns an error, but last_cmd_status misleadingly reports "ok", leaving the user unaware that the failure was caused by an invalid domain ID. Write an error message to last_cmd_status when the target domain ID cannot be found. Fixes: 28fa2cce7a83 ("fs/resctrl: Introduce interface to modify io_alloc ca= pacity bitmasks") Suggested-by: Reinette Chatre Signed-off-by: Aaron Tomlin Reviewed-by: Babu Moger Reviewed-by: Reinette Chatre Tested-by: Babu Moger --- fs/resctrl/ctrlmondata.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c index cc4237c57cbe..2ef53161ce11 100644 --- a/fs/resctrl/ctrlmondata.c +++ b/fs/resctrl/ctrlmondata.c @@ -992,6 +992,7 @@ static int resctrl_io_alloc_parse_line(char *line, str= uct rdt_resource *r, } } =20 + rdt_last_cmd_printf("Invalid domain %lu\n", dom_id); return -EINVAL; } =20 --=20 2.51.0 From nobody Thu Apr 2 15:35:48 2026 Received: from CWXP265CU009.outbound.protection.outlook.com (mail-ukwestazon11021122.outbound.protection.outlook.com [52.101.100.122]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3868C3597B for ; 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charset="utf-8" Configuring the io_alloc_cbm interface requires an explicit domain ID for each cache domain. On systems with high core counts and numerous cache clusters, this requirement becomes cumbersome for automation and management tasks that aim to apply a uniform policy. Introduce a wildcard domain ID selector "*" for the io_alloc_cbm interface. This enables users to set the same Capacity Bitmask (CBM) across all cache domains in a single operation. Signed-off-by: Aaron Tomlin Reviewed-by: Babu Moger Reviewed-by: Reinette Chatre Tested-by: Babu Moger --- Documentation/filesystems/resctrl.rst | 8 ++++++++ fs/resctrl/ctrlmondata.c | 21 +++++++++++++++++---- 2 files changed, 25 insertions(+), 4 deletions(-) diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesyst= ems/resctrl.rst index ba609f8d4de5..b003bed339fd 100644 --- a/Documentation/filesystems/resctrl.rst +++ b/Documentation/filesystems/resctrl.rst @@ -215,6 +215,14 @@ related to allocation: # cat /sys/fs/resctrl/info/L3/io_alloc_cbm 0=3D00ff;1=3D000f =20 + An ID of "*" configures all domains with the provided CBM. + + Example on a system that does not require a minimum number of consecutiv= e bits in the mask:: + + # echo "*=3D0" > /sys/fs/resctrl/info/L3/io_alloc_cbm + # cat /sys/fs/resctrl/info/L3/io_alloc_cbm + 0=3D0;1=3D0 + When CDP is enabled "io_alloc_cbm" associated with the CDP_DATA and CDP_= CODE resources may reflect the same values. For example, values read from and written to /sys/fs/resctrl/info/L3DATA/io_alloc_cbm may be reflected by diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c index 2ef53161ce11..9a7dfc48cb2e 100644 --- a/fs/resctrl/ctrlmondata.c +++ b/fs/resctrl/ctrlmondata.c @@ -954,25 +954,34 @@ static int resctrl_io_alloc_parse_line(char *line, s= truct rdt_resource *r, struct resctrl_schema *s, u32 closid) { enum resctrl_conf_type peer_type; + unsigned long dom_id =3D ULONG_MAX; struct rdt_parse_data data; struct rdt_ctrl_domain *d; + bool update_all =3D false; char *dom =3D NULL, *id; - unsigned long dom_id; =20 next: if (!line || line[0] =3D=3D '\0') return 0; =20 + if (update_all) { + rdt_last_cmd_puts("Configurations after global '*'\n"); + return -EINVAL; + } + dom =3D strsep(&line, ";"); id =3D strsep(&dom, "=3D"); - if (!dom || kstrtoul(id, 10, &dom_id)) { + + if (dom && !strcmp(id, "*")) { + update_all =3D true; + } else if (!dom || kstrtoul(id, 10, &dom_id)) { rdt_last_cmd_puts("Missing '=3D' or non-numeric domain\n"); return -EINVAL; } =20 dom =3D strim(dom); list_for_each_entry(d, &r->ctrl_domains, hdr.list) { - if (d->hdr.id =3D=3D dom_id) { + if (update_all || d->hdr.id =3D=3D dom_id) { data.buf =3D dom; data.mode =3D RDT_MODE_SHAREABLE; data.closid =3D closid; @@ -988,10 +997,14 @@ static int resctrl_io_alloc_parse_line(char *line, s= truct rdt_resource *r, &d->staged_config[s->conf_type], sizeof(d->staged_config[0])); } - goto next; + if (!update_all) + goto next; } } =20 + if (update_all) + goto next; + rdt_last_cmd_printf("Invalid domain %lu\n", dom_id); return -EINVAL; } --=20 2.51.0