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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by SJ5PEPF000001F3.mail.protection.outlook.com (10.167.242.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.615.4 via Frontend Transport; Wed, 11 Nov 2026 22:45:38 +0000 Received: from bmoger-ubuntu.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 15.2.2562.53; Wed, 11 Nov 2026 16:45:26 -0600 From: Babu Moger To: , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v7 06/19] fs/resctrl: Introduce data structures for kernel mode configuration Date: Wed, 11 Nov 2026 16:43:59 -0600 Message-ID: <4c86fe8b1d5d5e405faa67d19b5f6a236843b093.1794437052.git.babu.moger@amd.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: satlexmb08.amd.com (10.181.42.217) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001F3:EE_|CH2PR12MB4101:EE_ X-MS-Office365-Filtering-Correlation-Id: 715fa251-067e-43c9-4f76-08df404581cf X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|23010399003|376014|36860700016|82310400026|7416014|13003099007|261009223027099003|10067099003|261102123227099003|261021121427099003|261022075727099003|11063799006|5023799004|56012099006|6133799003|18002099003|22082099003; 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Introduce struct resctrl_kmode_cfg to represent supported kernel modes and their configuration. Signed-off-by: Babu Moger --- v7: Changed kmode_sup -> supported, kmode_cur -> active. Updated the changelog. Removed resctrl_kmode_init(). Updated the code comments. v6: Drop ctrl_en/mon_en and use resctrl_arch_alloc_capable() / resctrl_arch_mon_capable() directly. Flatten caps/active into resctrl_kmode_cfg. Rename resctrl_kcfg to resctrl_kmode, ctrl_mode to ctrl, mon_mode to mon, and k_rdtgrp to rdtgrp. Comments describe the objects, not a member list. Rewrite changelog. v5: Replace per-mode registration helpers with a single resctrl_kmode_cfg structure. Derive ctrl_en and mon_en from resctrl_arch_alloc_capable() and resctrl_arch_mon_capable() during filesystem init. Update code comments and changelog. v4: New patch to initialize supported kernel modes. https://lore.kernel.org/lkml/737a4228-52fb-4583-ac64-8efe79c107e6@intel.com/ Changed the kmode_cur to enum resctrl_kernel_mode in resctrl_kmode_cfg. Moved the resctrl_kmode_cfg to filesystem code. --- fs/resctrl/internal.h | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h index e62a277dee85..38aa0c0cfb7e 100644 --- a/fs/resctrl/internal.h +++ b/fs/resctrl/internal.h @@ -314,6 +314,33 @@ struct mbm_state { u32 prev_bw; }; +/** + * enum kmode_state - Kernel mode association state. + * @KMODE_INHERIT: Inherit the CLOSID or RMID from the user task. + * @KMODE_ASSIGN: Use the CLOSID or RMID from the backing resource group. + */ +enum kmode_state { + KMODE_INHERIT, + KMODE_ASSIGN +}; + +/** + * struct resctrl_kmode_cfg - Kernel mode configuration + * @supported: Bitmap of supported kernel modes. + * @active: Currently active kernel mode. + * @ctrl: CLOSID assign or inherit in %RESCTRL_GLOBAL_ENABLE_PER_CPU. + * @mon: RMID assign or inherit in %RESCTRL_GLOBAL_ENABLE_PER_CPU. + * @rdtgrp: Resource group backing %RESCTRL_GLOBAL_ENABLE_PER_CPU. + * %NULL while the mode is not selected. + */ +struct resctrl_kmode_cfg { + DECLARE_BITMAP(supported, RESCTRL_NUM_KERNEL_MODES); + enum resctrl_kernel_mode active; + enum kmode_state ctrl; + enum kmode_state mon; + struct rdtgroup *rdtgrp; +}; + extern struct mutex rdtgroup_mutex; static inline const char *rdt_kn_name(const struct kernfs_node *kn) -- 2.43.0