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Sun, 17 May 2026 20:27:42 -0700 Date: Sun, 17 May 2026 20:27:40 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , Jonathan Hunter , "Joerg Roedel" , , , Robin Murphy , "Thierry Reding" , Krishna Reddy , "Will Deacon" , David Matlack , Pasha Tatashin , , Pranjal Shrivastava , Samiullah Khawaja , Mostafa Saleh Subject: Re: [PATCH v2 7/9] iommu/arm-smmu-v3: Directly encode CMDQ_OP_ATC_INV Message-ID: References: <0-v2-47b2bf710ad5+716ac-smmu_no_cmdq_ent_jgg@nvidia.com> <7-v2-47b2bf710ad5+716ac-smmu_no_cmdq_ent_jgg@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <7-v2-47b2bf710ad5+716ac-smmu_no_cmdq_ent_jgg@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF00012E5F:EE_|DS0PR12MB8246:EE_ X-MS-Office365-Filtering-Correlation-Id: 435a04a9-ab46-4780-a21d-08deb48d7794 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700016|376014|7416014|1800799024|11063799003|4143699003|18002099003|56012099003|22082099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: bzKdTjtzq7MlPaOY1YDwogYoAq5dwW2n2gUI1S9n8478Vysa8F15GdU7+0ZaCfgw7pXEu/NKpz3Mmozmx8Q/lCrzkdAaRa0vsBjec8sMq+rOcEUiVztoeWmOyYwizt8lSXVoHgIQAsy4fLaLNl6tQ/+xml9X66BWFoiD9RooQgFS4v0nT7azkRD7XHMiwuk5AovXBCRuMEMNIdCLT2gNVJcVW82NB/B7HkU9BPiCIcz55l6NxakIxOlxfSisDFHqDPPqdrDKYhMNO92+1KadBB3KrMJSsYDirWxsN9EeO91Kc/+oAxeafZKfCpWdNLY4FiRxOZa0lVbKSrjqM3EhdKdi7prUiDrO8wjQcsmRM8TKiKU0y6z4z1L2Z/PGPGEcYV51Sg4iP7I6YqfSteyRsIwCLnAGmXfrlZXnQBlb16uThw1VoxalrINn5CAhZaNW X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 May 2026 03:28:02.1887 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 435a04a9-ab46-4780-a21d-08deb48d7794 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1PEPF00012E5F.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB8246 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260517_202811_443943_14CBBE90 X-CRM114-Status: GOOD ( 17.23 ) 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 On Wed, May 13, 2026 at 08:57:46PM -0300, Jason Gunthorpe wrote: > Add a new command make function and convert all the places using > ATC_INV. > > Split out full invalidation to directly make the cmd instead of > overloading size=0 to mean full invalidation. > > In section "3.9.1 ATS Interface" of F.b the specification says: > > When the SMMU returns an ATS Translation Completion for a request that > had a PASID, the Global bit of the Translation Completion Data Entry > must be zero. > > Even though it faithfully forwards the G bit through to the ATS > invalidation command there is no way to create G mappings so there is > never any need to send a G invalidation. Thus don't expose global in the > new helpers and leave CMDQ_ATC_0_GLOBAL unused. > > Reviewed-by: Mostafa Saleh > Reviewed-by: Pranjal Shrivastava > Tested-by: Pranjal Shrivastava > Tested-by: Mostafa Saleh > Signed-off-by: Jason Gunthorpe Reviewed-by: Nicolin Chen With a nit .. > -static void > -arm_smmu_atc_inv_to_cmd(int ssid, unsigned long iova, size_t size, > - struct arm_smmu_cmdq_ent *cmd) > +static struct arm_smmu_cmd > +arm_smmu_atc_inv_to_cmd(u32 sid, int ssid, unsigned long iova, size_t size) > { > size_t log2_span; > size_t span_mask; > @@ -2395,17 +2386,6 @@ arm_smmu_atc_inv_to_cmd(int ssid, unsigned long iova, size_t size, > * This has the unpleasant side-effect of invalidating all PASID-tagged > * ATC entries within the address range. > */ > - *cmd = (struct arm_smmu_cmdq_ent) { > - .opcode = CMDQ_OP_ATC_INV, > - .substream_valid = (ssid != IOMMU_NO_PASID), > - .atc.ssid = ssid, > - }; > - > - if (!size) { > - cmd->atc.size = ATC_INV_SIZE_ALL; > - return; > - } .. should !size jump to arm_smmu_make_cmd_atc_inv_all()? Or maybe add a note to disallow this function being used with !size and WARN_ON? The function name itself doesn't sound very restricted though. Nicolin