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Mon, 10 Jun 2024 20:02:39 -0700 Date: Mon, 10 Jun 2024 20:02:38 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , Joerg Roedel , , Robin Murphy , Will Deacon , Michael Shavit , , Ryan Roberts , Mostafa Saleh Subject: Re: [PATCH v2 08/10] iommu/arm-smmu-v3: Shrink the cdtab l1_desc array Message-ID: References: <0-v2-318ed5f6983b+198f-smmuv3_tidy_jgg@nvidia.com> <8-v2-318ed5f6983b+198f-smmuv3_tidy_jgg@nvidia.com> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <8-v2-318ed5f6983b+198f-smmuv3_tidy_jgg@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PEPF00000010:EE_|DM4PR12MB7527:EE_ X-MS-Office365-Filtering-Correlation-Id: 5865a0e0-c289-410d-a2ca-08dc89c2f899 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230031|82310400017|36860700004|376005|1800799015; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Jun 2024 03:02:46.5528 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5865a0e0-c289-410d-a2ca-08dc89c2f899 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CH3PEPF00000010.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB7527 On Mon, Jun 10, 2024 at 09:31:17PM -0300, Jason Gunthorpe wrote: > The top of the 2 level CD table is (at most) 1024 entries big, and two > high order allocations are required. One of __le64 which is programmed > into the HW (8k) and one of struct arm_smmu_l1_ctx_desc which holds the > CPU pointer (16k). > > There are two copies of the l2ptr_dma, one is stored in the struct > arm_smmu_l1_ctx_desc, and another is encoded in the __le64 for the HW to > use. Instead of storing two copies just decode the value from the __le64. > > Signed-off-by: Jason Gunthorpe Reviewed-by: Nicolin Chen