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Fri, 6 Mar 2026 12:34:25 -0800 Date: Fri, 6 Mar 2026 12:34:24 -0800 From: Nicolin Chen To: Jason Gunthorpe CC: Robin Murphy , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v1 2/2] iommu/arm-smmu-v3: Recover ATC invalidate timeouts Message-ID: References: <20260305153911.GT972761@nvidia.com> <20260305234158.GB1651202@nvidia.com> <60d77adc-d5a6-40e2-a497-a57004f23e7e@arm.com> <20260306140115.GH1651202@nvidia.com> <20260306202216.GO1651202@nvidia.com> Precedence: bulk X-Mailing-List: iommu@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: <20260306202216.GO1651202@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF000015CB:EE_|LV3PR12MB9094:EE_ X-MS-Office365-Filtering-Correlation-Id: 834f47ab-7d7c-4441-0024-08de7bbfccca X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|82310400026|7416014|376014|1800799024; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: AklOSyOY3YvtRp5LTuAQyLnEgUe/ffNjiTuQI7RShON2l6lizvgdhnx1CgGdvcSId4jfJ9Ziz2urplggiEacpReLiJ56zsi2Kd5/6T2mPlYGqZqZsJw7v7wVeNIWsdtpvstQmAmNVyUbhMkM8SIVB90jIQnicrTjC02PnJ6tzcVG/rUg6LG4YEpHnJXH5/w1Mw59y4ab3vPUIfBMwN7q6ihCvraJVp0vwLM5BPbhRIijeRYRavrMs+bv6YCSGHROIrPjh+pb0xnKznL5MP27190Gxe+fQo64j1XACpEMVFptc8MVnkkFY7xv64+h3n+oD4+PitZIVnhSgRkFKFnEMrQMwBF2JwJ79PoS6lICLk3/guX0bKKp2cSO/pDoe0x4q7aBfAp05DNFyIgWOVfh0scK5AF44zlij1NJqtKOhkvNzq06M7TFTnxMYyL2H4VI X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Mar 2026 20:34:43.6739 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 834f47ab-7d7c-4441-0024-08de7bbfccca 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: SA2PEPF000015CB.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV3PR12MB9094 On Fri, Mar 06, 2026 at 04:22:16PM -0400, Jason Gunthorpe wrote: > On Fri, Mar 06, 2026 at 12:18:24PM -0800, Nicolin Chen wrote: > > > IIUIC, we would have two timeouts to identify the device(s), so we > > wouldn't need to give away the optimization of batching ATCI cmds? > > Yes we should not harm success path performance to compensate for a > RAS error case. > > > Will letting a faulty device time out once again give it a window > > to corrupt the memory? > > No, you are doing this within the flush callback so everything relying > on that flush should remain held. Oh, right! I didn't see that coming.. I will rebase the next version on the invalidation series as we have multiple things relying on that now. Thanks Nicolin