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Tue, 14 Jul 2026 16:09:22 -0700 Date: Tue, 14 Jul 2026 16:09:21 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , "Joerg Roedel (AMD)" , Jean-Philippe Brucker , , Robin Murphy , Will Deacon , David Matlack , "Pasha Tatashin" , , "Pranjal Shrivastava" , Samiullah Khawaja , Mostafa Saleh Subject: Re: [PATCH v3 7/8] iommu/arm-smmu-v3: Change how the tlbi describes the invalidation Message-ID: References: <0-v3-4e7f64f4e094+85e-smmu_tlbi_jgg@nvidia.com> <7-v3-4e7f64f4e094+85e-smmu_tlbi_jgg@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <7-v3-4e7f64f4e094+85e-smmu_tlbi_jgg@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001F7:EE_|PH7PR12MB5620:EE_ X-MS-Office365-Filtering-Correlation-Id: d8c954f7-62e2-4754-a496-08dee1fcf752 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|1800799024|36860700016|376014|82310400026|23010399003|18002099003|22082099003|11063799006|56012099006|4143699003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 1DM3AOsM9UlcCusii+FSh03GqRphPTgvky6I4BT+xZXZ+PRQN+Bu65D1+io6/gy8geEIe0QI0PaFqBV3l2Ksz1y6auNaszYEmolRIUEAEMxEgukVhhIPafEBALXewOaTKMnkwaaOoB8Drwyv9G91B6R4+VBJ/VeycNd7JMpDFYw40x1gyqJTAMhu61Y6zeR9tbriYPtAyzcHNLMrO4EX1WqYU062A5I2IrvzNNgx+95TM0XCaDT1BmIR+ZCkwUcTmgeey4rbRl5HYCaF8PqMHdhw0gzmcgZMJzfZrUaD+F4rka7nd0RUo2tI9EQdeoucPp5tytaE/Mu2v8Mv7+mZucGt2lIgqwujzUIZucMPc0a8P2UCXE//VXKRCPeJKS9mh8OifBrH0WZm2uucUHmpRieOELwyeShDNw4dV1Vhq4mhrrHZON3colyJ3PLVaUEE X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jul 2026 23:09:33.0382 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d8c954f7-62e2-4754-a496-08dee1fcf752 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001F7.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB5620 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260714_160941_936884_EE1E7BE2 X-CRM114-Status: GOOD ( 13.13 ) 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 Tue, Jul 14, 2026 at 03:46:07PM -0300, Jason Gunthorpe wrote: > +static unsigned int arm_smmu_compute_ttl(u8 leaf_bitmap, u8 table_bitmap, > + } else { > + /* Both bitmaps zero is not allowed */ > + return 0; > + } "not allowed" reads like we need a WARN_ON? Otherwise, should it be reworded? > +static u8 arm_smmu_tlbi_calc_stride(struct arm_smmu_tlbi *tlbi) > +{ > + u8 combined = tlbi->table_levels_bitmap | tlbi->leaf_levels_bitmap; > + u8 tg_szlg2 = tlbi->tgsz_lg2; > + > + if (!combined) > + return U8_MAX; As the code checks "combined", ... > + * If leaf_levels_bitmap is 0 then this is a walk cache only > + * invalidation. If table_levels_bitmap is 0 then this is a leaf only > + * invalidation. ..., how about listing all combinations in this kdocs: * The pair (table, leaf) below selects the invalidation scope: * table!=0, leaf==0 : walk cache only * table==0, leaf!=0 : leaves only * table!=0, leaf!=0 : walk cache + leaves * table==0, leaf==0 : a full invalidation ? > + * Level bitmaps use iommupt numbering: bit 0 is the leaf-only level > + * (ARM level 3), bit 1 is the next level up (ARM level 2), etc. Also, the driver calculates ttl via the inverted numbering noted here. How about: static inline int arm_smmu_bitmap_to_level(u8 bitmap) { return 3 - (int)__ffs(bitmap); } ? Then, arm_smmu_compute_ttl() would read slightly better. With that, Reviewed-by: Nicolin Chen