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Received: from DS7PR12MB9474.namprd12.prod.outlook.com (2603:10b6:8:252::17) by MN2PR12MB4254.namprd12.prod.outlook.com (2603:10b6:208:1d0::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.48.14; Thu, 21 May 2026 07:30:50 +0000 Received: from DS7PR12MB9474.namprd12.prod.outlook.com ([fe80::31ad:931:ef07:8ad7]) by DS7PR12MB9474.namprd12.prod.outlook.com ([fe80::31ad:931:ef07:8ad7%6]) with mapi id 15.21.0025.016; Thu, 21 May 2026 07:30:50 +0000 From: Srirangan Madhavan To: catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, lpieralisi@kernel.org, sudeep.holla@arm.com Cc: conor@kernel.org, jic23@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, vsethi@nvidia.com, jevans@nvidia.com, raghupathyk@nvidia.com, srikars@nvidia.com, nbenech@nvidia.com, alwilliamson@nvidia.com, Dan Williams , Srirangan Madhavan Subject: [RFC PATCH 0/2] arm64: add SMCCC cache invalidation backend for memregion users Date: Thu, 21 May 2026 07:30:45 +0000 Message-ID: <20260521073047.320614-1-smadhavan@nvidia.com> X-Mailer: git-send-email 2.43.0 X-NVConfidentiality: public Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SJ0PR13CA0202.namprd13.prod.outlook.com (2603:10b6:a03:2c3::27) To DS7PR12MB9474.namprd12.prod.outlook.com (2603:10b6:8:252::17) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR12MB9474:EE_|MN2PR12MB4254:EE_ X-MS-Office365-Filtering-Correlation-Id: 15a1c7f3-8f59-41a4-12c3-08deb70ae1f2 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016|18002099003|56012099003|11063799006|6133799003; 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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This series adds an arm64 backend for memregion cache invalidation users based on the Arm SMCCC cache clean+invalidate interface. Per DEN0028, this interface targets systems where a Normal Cacheable memory region can be modified in ways that are not handled by usual PE coherency mechanisms, and where VA-based CMOs may be too slow or insufficient for large ranges and/or system-cache implementations. Representative use cases include device-backed memory state transitions where stale CPU/system cache lines must be invalidated reliably (for example secure erase, reset/offline flows, and dynamic memory reconfiguration). Patch 1 introduces the Arm SMCCC cache clean/invalidate function IDs and transient return codes needed by callers [1]. Patch 2 adds an arm64 cache maintenance provider that: - discovers SMCCC support and attributes at init time - registers with the generic cache coherency framework used by cpu_cache_invalidate_memregion() - handles transient BUSY/RATE_LIMITED responses with bounded retries - coalesces waiters when firmware reports a global operation type This patch set does not add a software fallback path; when firmware does not implement the SMCCC cache maintenance interface, the provider is not registered and existing behavior is preserved. Reference: [1] https://developer.arm.com/documentation/den0028/latest Srirangan Madhavan (2): arm64: smccc: add cache clean/invalidate IDs and return codes arm64: mm: add SMCCC-backed cache invalidate provider MAINTAINERS | 1 + arch/arm64/mm/Makefile | 1 + arch/arm64/mm/cache_maint.c | 180 ++++++++++++++++++++++++++++++++ include/linux/arm-smccc.h | 17 ++- tools/include/linux/arm-smccc.h | 17 ++- 5 files changed, 212 insertions(+), 4 deletions(-) create mode 100644 arch/arm64/mm/cache_maint.c base-commit: 3b3bea6d4b9c162f9e555905d96b8c1da67ecd5b -- 2.43.0