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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 SJ5PEPF000001F0.mail.protection.outlook.com (10.167.242.68) 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 22:45:49 +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 16:45:47 -0600 From: Babu Moger To: , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v7 08/19] x86/resctrl: Register RESCTRL_GLOBAL_ENABLE_PER_CPU when PLZA is available Date: Wed, 11 Nov 2026 16:44:01 -0600 Message-ID: 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: SJ5PEPF000001F0:EE_|PH7PR12MB5974:EE_ X-MS-Office365-Filtering-Correlation-Id: 7d9d9815-46b2-449d-8178-08df40458844 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|23010399003|376014|36860700016|82310400026|7416014|261009223027099003|10067099003|261102123227099003|261021121427099003|261022075727099003|11063799006|5023799004|56012099006|18002099003|22082099003; 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Register the RESCTRL_GLOBAL_ENABLE_PER_CPU kernel mode with the resctrl kernel mode infrastructure when PLZA is supported. Signed-off-by: Babu Moger --- v7: Changelog Update for consistancy. v6: Use RESCTRL_GLOBAL_ENABLE_PER_CPU. Rewrite changelog (not a bugfix). v5: Update the patch to adapt new data structure and resctrl_set_kmode_support() changes. v4: New patch to set the supported features during arch init. --- arch/x86/kernel/cpu/resctrl/core.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c index e64e9191184e..14530c11bbd7 100644 --- a/arch/x86/kernel/cpu/resctrl/core.c +++ b/arch/x86/kernel/cpu/resctrl/core.c @@ -990,6 +990,10 @@ static __init bool get_rdt_resources(void) rdt_alloc_capable = get_rdt_alloc_resources(); rdt_mon_capable = get_rdt_mon_resources(); + if (rdt_cpu_has(X86_FEATURE_PLZA) && + (rdt_alloc_capable || rdt_mon_capable)) + resctrl_set_kmode_support(RESCTRL_GLOBAL_ENABLE_PER_CPU); + return (rdt_mon_capable || rdt_alloc_capable); } -- 2.43.0