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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> 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; X-Microsoft-Antispam-Message-Info: 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 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:(13230040)(36860700016)(82310400026)(7416014)(376014)(1800799024);DIR:OUT;SFP:1101; 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260306_123451_037447_4BBE3E6C X-CRM114-Status: GOOD ( 11.78 ) 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 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