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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 3oVdIjf3Od4UYMl3tiWaVALz6GTYeu3LJ7TVWf2YpHZSnLOB2UqJubzzMP52BaIyAM2QD6lBFVtpWp1z7GQs86Y0BWYshNo7RWpRiy/wCq0JftZJUnKCjHry3ESH8I+Yly1Yaw0Qq0N52Imsg4ErZ7cngDvRZVRehDWmTEEON6+jpby/990dNRUriGQB6D7oyKODzP2MFK8zcKtlQlRtARF8w+9S83ufIaO7JGAP4doVbMYEcVlxrbRlSQWmAqS+drOQbHkzIVCXbqNIVyJvd01AI6BuVhFL/T+zVmPj/rDRjxaA3FWyiY9/dYHkjbJdgNos8qTztuO/W//8isR4TFMbPOsR+jA7/W75SXgwnkFp5skaY4GK0wVfhkbFsPzvS7hqX/a2b4/kbGrxW49lBq0zZKoqC1Cmmb5pihMKGwRSUh7bU0amLr4D/Y90A1ry X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Oct 2026 08:41:53.8686 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: fa5a999b-544b-49d3-725b-08df301852fd X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AM2PEPF00070CF7.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM8PR08MB5633 On 10/21/26 18:50, Nicolin Chen wrote: >> Earlier the event queue feature flag was unset - should we still be going >> with that decision? > Yes. EVETQ and PRIQ are disabled in kdump mode, even today: > > if (is_kdump_kernel()) > enables &= ~(CR0_EVTQEN | CR0_PRIQEN); ok > >> Did you consider to just re-probe the SMMU driver without trying this >> adoption method when problems occur? > You mean -EPROBE_DEFER? Yes, and it should play ok with the IOMMU probe ordering "replay" mechanism. > I don't think it would be cleaner.. > > And it would retry the "adopt" mode again? No, that's the point. Currently you first try the adopt mechanism; if a problem is found there, you fall back to the normal full reset. My idea is that if a problem is found with the adopt mechanism, you just re-probe with the normal full reset method, so that you don't need to undo some adopt work during the probe. > This is a per-smmu > option, no global flag. When it re-probes, smmu pointer would > be reallocated. So it won't disable the adopt path during the > re-probe. > > Here, we just have three lines to fallback immediately, which > is much less expensive than a re-probe, IMHO. ok, if you think so. BTW, on another point, nobody checks the specific error code returned value from arm_smmu_kdump_adopt_strtab(), so you can consider making it return a bool.