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Received: from CH3PR12MB8659.namprd12.prod.outlook.com (2603:10b6:610:17c::13) by IA1PR12MB8191.namprd12.prod.outlook.com (2603:10b6:208:3f3::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9052.15; Thu, 21 Aug 2025 13:07:45 +0000 Received: from CH3PR12MB8659.namprd12.prod.outlook.com ([fe80::6eb6:7d37:7b4b:1732]) by CH3PR12MB8659.namprd12.prod.outlook.com ([fe80::6eb6:7d37:7b4b:1732%4]) with mapi id 15.20.9031.024; Thu, 21 Aug 2025 13:07:43 +0000 Date: Thu, 21 Aug 2025 10:07:41 -0300 From: Jason Gunthorpe To: Nicolin Chen Cc: Ethan Zhao , robin.murphy@arm.com, joro@8bytes.org, bhelgaas@google.com, will@kernel.org, robin.clark@oss.qualcomm.com, yong.wu@mediatek.com, matthias.bgg@gmail.com, angelogioacchino.delregno@collabora.com, thierry.reding@gmail.com, vdumpa@nvidia.com, jonathanh@nvidia.com, rafael@kernel.org, lenb@kernel.org, kevin.tian@intel.com, yi.l.liu@intel.com, baolu.lu@linux.intel.com, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-tegra@vger.kernel.org, linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, patches@lists.linux.dev, pjaroszynski@nvidia.com, vsethi@nvidia.com, helgaas@kernel.org Subject: Re: [PATCH v3 5/5] pci: Suspend iommu function prior to resetting a device Message-ID: <20250821130741.GL802098@nvidia.com> References: <3749cd6a1430ac36d1af1fadaa4d90ceffef9c62.1754952762.git.nicolinc@nvidia.com> <550635db-00ce-410e-add0-77c1a75adb11@gmail.com> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?eqeD9lxcWqHis5hh+Y1/SFiVT8CbkVDVyV9IMZuvE5aenm6w4f+ecVh8Woaj?= =?us-ascii?Q?JpJN91FImSEhXcSWRGQX1s//288clAZ+6nka9Vf46IavDWuuGVDRnzP70uOa?= =?us-ascii?Q?pIXacJnyln0H6/oFJSxSH0kojfSTLiFST7zghd3huH4jhf+iDZXvksFdLg2w?= =?us-ascii?Q?HUHL6NXMxdnntud5T6Ge+d7FyC8oOWnnOyIXVNrqYq4fPt1vlbXxugi7zAuc?= =?us-ascii?Q?OPxBv3HsEy6OH1eOjCuHNQj6NDxCvAnvB39EbNIfLYIa0P8KAlhytpc4p9TS?= =?us-ascii?Q?oiN4pJBP18V5WgZ9N1vy69ts/3KBy/JRgCCd9V+KZG0Kk1A9O2bHjqyJsGTs?= =?us-ascii?Q?d4iphXFoBH6yrqfYg6ziecvCG19ErecH1aABcCPS4ZC4VY+r9N8zeXi1Upge?= =?us-ascii?Q?aA7OpEhkGrzUDv46U5WrG50BpFeajBIFMZPC1AA9GAsGyiXj5Rt7V5zqY5uS?= =?us-ascii?Q?dDxDvIsBG+zVkXQJPhiDJk4iAw3uhnal86+28s7U8DHFSPeUVzsKQqBtm5xW?= =?us-ascii?Q?/geNqMLBOPItEUPsisVzWOHBX2qQyaQ7ofGHS9jwlOqWb9NwsFYfi21SvSby?= =?us-ascii?Q?I/ndnuNwvMYjD9npHS1PmcWcKgcupRs02VTpjYSTr+vXFny7aH1nKXTJQpvJ?= =?us-ascii?Q?DGz753wGpvRCJO8w5V0qEHT4rtjZre4MogcS4cdjGotmQT2hSo+1Sqp+PqDT?= =?us-ascii?Q?fc/SoZ8cb7YSiuieRF7KJlnVhNzA6tKIteQ4XFJnImkVuMKa17sB+MC41NRa?= =?us-ascii?Q?84HvMs8xDY0OKZETfgZb7yIHfwPJ8jUuIGmfk4F6SRaDMA2yqPb5tgdHH7y2?= =?us-ascii?Q?uHtlAz+n5dL7Py3ngNBwV75E5F2zcQGEeu0YKD587yj8tP8/Sj7EBWNjAT/q?= =?us-ascii?Q?7zqbGJgS7NB/wgz0Q7MS/9WLol7KxThqeftdz9xQPgiEIvQYMv7JnRg2YOKK?= =?us-ascii?Q?Qw9DEvhnH8Wp8yTkDKROKkHQmhlShs19TbHqiqPPkVb5MpqeEE8G92WULuZM?= =?us-ascii?Q?zbVsOC7nk2oCyFMM0J54pVH6oO56jPt6RRup+Mt6wpt44luwAJQhpIvt2h3p?= =?us-ascii?Q?uL4k/7QvX9QYYZE4n9DQcsR2m2APu1IpvSgiIxjrZ2srZgRYLt7Tz2TLe7cW?= =?us-ascii?Q?+uNy5GGDEirIBMT81zZy/P0NDiHIcnkiLZ0I5S8aO1dJs+xAFbNgR4kafImU?= =?us-ascii?Q?yNUs2YXBTOuIZKU0SjSikVG+qVfe9m75YLEkHy7M3pzCcV9AUA4xODx9sHa8?= =?us-ascii?Q?ewyPDUqQatfj+CBZvl+Vmf7X9mNUU05MKL4FHEetPHh5Qjk9DwwtS8efU/lT?= =?us-ascii?Q?bL66IiEgdsBf6kj4l3/ZThE+Pqp0W+83b3y9CrdCDNnIHV92j3XN9YYH+6IN?= =?us-ascii?Q?LGKro6G+RhSoOF8DZvynUWS5lfE2uAT6Pil1yIkm28/asrpktCy4Jhzn7wAQ?= =?us-ascii?Q?eCO6V4zJ2rYfQkYPf1+d76JYoTYjszxcj6UqwLP+sjQzXS0/911o2QJP3tuU?= =?us-ascii?Q?beqgI9VZ+rSnqH03VUmbXLo/IbGbB5fpw6Jh8/8Ii8K1GiRc8hlh4ZlXYffL?= =?us-ascii?Q?HDF7OUqKBOHrlzzh2+U8RMQ75UWel8o3LEBF27Ii?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 6840f9d1-da1c-43f7-5ac1-08dde0b3b761 X-MS-Exchange-CrossTenant-AuthSource: CH3PR12MB8659.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Aug 2025 13:07:43.8992 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: AouWxZnohcmS2zD6Pv4f2xJEgrSueEdvNbhuckvZfxtNx0/WNUkaJ5GYdKt/4gT2 X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB8191 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250821_060751_742043_B34C10D8 X-CRM114-Status: GOOD ( 10.82 ) 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, Aug 19, 2025 at 02:59:07PM -0700, Nicolin Chen wrote: > c) multiple pci_devs with their own RIDs > > In this case, either FLR or IOMMU only resets the PF. That > being said, VFs might be affected since PF is resetting? > If there is an issue, I don't see it coming from the IOMMU- > level reset.. It would still allow the ATS issue from the VF side. The VF could be pushing an invalidation during the PF reset that will get clobbered. I haven't fully checked but I think Linux doesn't really (easially?) allow resetting a PF while a VF is present... Arguably if the PF is reset the VFs should have their translations blocked too. Jason