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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> MIME-Version: 1.0 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; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?qyFPQ5GYFqXL4KyW/YDJ7c7K3QureLjD7yyRx7H2CGD/kTFknU9v9RsgiQ2H?= =?us-ascii?Q?D0ylIF6uP0l2xCwRLqCoLHA6jpFpca9fs35bbRcImdnylpagpixHyPxoPK+9?= =?us-ascii?Q?hu7Czpxe5vshdOUMoIenaoRfCQwmVJVWpASqAoF81+KH1rhixao7nsoqMJF8?= =?us-ascii?Q?83jbiaKFU56nvpFp01SNjFLR0unXf+wGnvv74zNLI7voiMDdi42LF5pLK6k2?= =?us-ascii?Q?pCKDhCk4UU6HwOxjKmpdMTwWxeeWiAPxRLVKBbbNnMRmt8JBtu32sz+qXnYN?= =?us-ascii?Q?BUasfbHOO7OzSjmASco2daBqrJl/Z4YZ+b3zyO0lg7uZfD7QgVlrFmeooaXd?= =?us-ascii?Q?4CV26zVy8/xW8CKfwUY5ZhY4D3UnGqGZriuWMNyRnL+bI1PAvXrobyCNSki+?= =?us-ascii?Q?1LjbehvGVg+kEIqVbioEvYzlWuxWX/6P71TyGwXJE8RZco62KTSZJaMwYewg?= =?us-ascii?Q?qsP8m0p+U44GgyJCRPE95gGozaK5CzojOsTFDq0rhv0WXlEjLjrBQnnmrBtZ?= =?us-ascii?Q?hJM+iNdRpDejQKi4nk/gKyWUStGRjaBW1Y9BteTpOCku5Yu4UO8Uzk6btIMU?= =?us-ascii?Q?uVLkbZgvupZDVOvKv9ZvKodPfNCyENUDDCcccO/DG3Bybl5i2EUJTVMrrnGC?= =?us-ascii?Q?nRtkM0VipiddRBqz/aMRKLytsT0c65mz2iO08YU0ECMukspyyy65yI1USARF?= =?us-ascii?Q?vFbsH6RzGlcPjpk+M4VOIeOxVG4ls1eX+8JAqjIl/UN59sqdvK68VaAFbwWA?= =?us-ascii?Q?ym8Kvf1cx1ge5+GV3EARvWpXQqB2TZBD8Q5ugyJq0HCRyf/YOqpOud3mQuRp?= =?us-ascii?Q?xUEoEYr3E9Ktg2XsXSuq+ZFgTZRcvWfds6yMtI5WTgbkdQrtupMQ5AKQe2U/?= =?us-ascii?Q?HS0UcbbwkcQkPpuS+5YWj+fPceKOpecCClFEG75zUt1vmwFWcqviERXnIRHa?= =?us-ascii?Q?GsCjnBLiIIomfuZ4nRrOWHMlxoyaEcFms+R4XLG3WS4GNwQ5+fLkztWZQ5eZ?= =?us-ascii?Q?KTxI9Y0ZKeGz1Yg8VJDOOFWAjTtqMsR+oJLpQ/kAaeBdp5S8AEPB1J/JPkC/?= =?us-ascii?Q?QK+2Q8mZwgP+EbF124dI7A7TvqZtfLExeMFTbu0WxfeB4xZWcUTYzLQWkotD?= =?us-ascii?Q?Vti9NMAVyrL2uhVw1PAt0WIuQ4LlKI3EsSRC4Gn10YPnybMjgx/q95hCCJaZ?= =?us-ascii?Q?9CwfBohI88020ElrBV3HyGNZ0qBMXJxk62gsBAB/1kAjGpmSG8lKMbLwUw5F?= =?us-ascii?Q?DiibZeXL7sP75m75f5ApjeQnAneFyumRNBIcu500VnKa6zl6Ka0obj26JsBO?= =?us-ascii?Q?cXTqCiFKRdLOScRvLd6rNlXf/kkZrIaBEnFqSnfq8zwp6/LiAxLGlCTzKACV?= =?us-ascii?Q?kqzVI1VcLzsW1z5M8ntbmPHO9YvZoPukjSBMWSDj11DJKctsHw=3D=3D?= X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230031)(82310400017)(36860700004)(376005)(1800799015);DIR:OUT;SFP:1101; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel