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Fri, 24 Apr 2026 11:33:18 -0700 Received: from Asurada-Nvidia (10.127.8.12) by mail.nvidia.com (10.126.190.182) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20 via Frontend Transport; Fri, 24 Apr 2026 11:33:17 -0700 Date: Fri, 24 Apr 2026 11:33:16 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , , , , , , , , , , , , Subject: Re: [PATCH rc v2 1/5] iommu/arm-smmu-v3: Add arm_smmu_adopt_strtab() for kdump Message-ID: References: <20260424165613.GC3444440@nvidia.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20260424165613.GC3444440@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN2PEPF000044A4:EE_|MW4PR12MB6852:EE_ X-MS-Office365-Filtering-Correlation-Id: 1c26bb8e-7044-4080-2d29-08dea22ff9ad X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|36860700016|376014|82310400026|1800799024|22082099003|18002099003|56012099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: bmDuVLcu0KGkkpqaXPnSZI7dCrbfpBJVwitrRVg/pgDC13O+fzID+JLu6j7SYzl6qVVdkL3N7nmVHheSYEOT7Azhd59EpMhUUmdBvIo3U6dfB1U8DAfKOTp4fjAcB0UYphFqVpQR/YTj9rpdRUyXxNJDDbOwyB9TQfNhgTOedlPjDRzCn07dhyHcn25m0soSbpx+zjdVgmDFQsmHXvRGOSCS1CHgjBcVDZRYczp1xQwyJIpEog6JOn7KffJKhC8GEv80s5s4k7BC5Crqt6QtGWyYuZPA0iYVwFPT5iin/L3QtluhPsP6OhUNHYn282PpF7tuVL8Ry0dvv4V3bGPz9HgGHlPp07C08OdRLV4SrdqGQKine5/5xiTldoZWAkcjTB2U8ftRoXAxCPffSdJSUtBUAcOg6U3UMEEwgTq5Ua+OFzs3T5tRSXz7zL5X192+ X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Apr 2026 18:33:26.7763 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1c26bb8e-7044-4080-2d29-08dea22ff9ad X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN2PEPF000044A4.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB6852 On Fri, Apr 24, 2026 at 01:56:13PM -0300, Jason Gunthorpe wrote: > On Wed, Apr 15, 2026 at 02:17:36PM -0700, Nicolin Chen wrote: > > +static int arm_smmu_adopt_strtab_2lvl(struct arm_smmu_device *smmu, u32 cfg_reg, [..] > > + cfg->l2.l1tab = devm_memremap( > > + smmu->dev, dma, num_l1_ents * sizeof(struct arm_smmu_strtab_l1), > > + MEMREMAP_WB); > > WB shouldn't be unconditional? If the SMMU is working non-coherently > we need to map it NC. Same remark everwhere Hmm, I am trying to add a coherent-only gate for the series. MEMREMAP_WC might work. But we cannot verify that on a coherent SMMU, right? Nicolin