{"id":2225514,"url":"http://patchwork.ozlabs.org/api/covers/2225514/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/cover/20260421-nova-unload-v2-0-2fe54963af8b@nvidia.com/","project":{"id":28,"url":"http://patchwork.ozlabs.org/api/projects/28/?format=json","name":"Linux PCI development","link_name":"linux-pci","list_id":"linux-pci.vger.kernel.org","list_email":"linux-pci@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260421-nova-unload-v2-0-2fe54963af8b@nvidia.com>","list_archive_url":null,"date":"2026-04-21T06:16:10","name":"[v2,0/5] gpu: nova-core: run unload sequence upon unbinding","submitter":{"id":13521,"url":"http://patchwork.ozlabs.org/api/people/13521/?format=json","name":"Alexandre 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Alice Ryhl ,\n David Airlie , Simona Vetter ,\n Bjorn Helgaas ,\n =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= ,\n Miguel Ojeda , Gary Guo , =?utf-8?q?Bj?=\n\t=?utf-8?q?=C3=B6rn_Roy_Baron?= ,\n Benno Lossin , Andreas Hindborg ,\n Trevor Gross , Boqun Feng ","Cc":"John Hubbard ,\n Alistair Popple ,\n Joel Fernandes , Timur Tabi ,\n Eliot Courtney , nouveau@lists.freedesktop.org,\n dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,\n linux-pci@vger.kernel.org, rust-for-linux@vger.kernel.org,\n Alexandre Courbot ","X-Mailer":"b4 0.15.2","X-ClientProxiedBy":"OS7PR01CA0073.jpnprd01.prod.outlook.com\n (2603:1096:604:253::16) To CH2PR12MB3990.namprd12.prod.outlook.com\n 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477a7aef-f8df-41b2-62c7-08de9f6d7ec4","X-MS-Exchange-CrossTenant-AuthSource":"CH2PR12MB3990.namprd12.prod.outlook.com","X-MS-Exchange-CrossTenant-AuthAs":"Internal","X-MS-Exchange-CrossTenant-OriginalArrivalTime":"21 Apr 2026 06:16:16.2987\n (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":"\n HA0MAwdKhH8uYrIIyB/KbHOaQCL7hrr76GYaB7oKWQyluFV97TBNCLR8ogxbJ6Rw+tSTHYK7K81MU+v8MzY8kA==","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"CYYPR12MB8749"},"content":"Currently the GSP is left running and the WPR2 memory region untouched\nwhen the driver is unbound. This is obviously not ideal for at least two\nreasons:\n\n- Probing requires setting up the WPR2 region, which cannot be done if\n there is already one in place. Hence the current requirement to reset\n the GPU (using e.g. `echo 1 >/sys/bus/pci/devices/.../reset`) before\n the driver can be probed again after removal.\n- The running GSP may still attempt to access shared memory regions\n which the kernel might recycle.\n\nOn top of that, there is a nasty bug in the Blackwell VBIOS that\nsometimes borks the GPU upon PCI reset, requiring a reboot. So relying\non the PCI reset to unload/reload Nova is really not practical here.\n\nThis series does the necessary to leave the GPU in a clean state after\nunbind, for all currently supported GPUs. Blackwell support is trivial\nand will be added alongside the Blackwell series [1] if this can be\nmerged first.\n\nThe first patch adds a `warn_on_err` utility macro to the kernel crate\nas it is useful to warn on failures in the driver unbind path, but I can\nremove it if it is not deemed useful.\n\nThis series applies cleanly on `master` as of today.\n\n[1] https://lore.kernel.org/all/20260411024953.473149-1-jhubbard@nvidia.com/\n\nSigned-off-by: Alexandre Courbot \n---\nChanges in v2:\n- Rebase on top of `master` and remove unneeded/obsolete preparatory patches.\n- Tidy up the imports of commands from the `fw` module in the `gsp` module.\n- Link to v1: https://patch.msgid.link/20251216-nova-unload-v1-0-6a5d823be19d@nvidia.com\n\n---\nAlexandre Courbot (5):\n rust: add warn_on_err macro\n gpu: nova-core: use warn_on_err macro\n gpu: nova-core: do not import firmware commands into GSP command module\n gpu: nova-core: send UNLOADING_GUEST_DRIVER GSP command upon unloading\n gpu: nova-core: run Booter Unloader and FWSEC-SB upon unbinding\n\n drivers/gpu/nova-core/firmware/booter.rs | 1 -\n drivers/gpu/nova-core/firmware/fwsec.rs | 1 -\n drivers/gpu/nova-core/gpu.rs | 21 ++++--\n drivers/gpu/nova-core/gsp/boot.rs | 83 +++++++++++++++++++++++\n drivers/gpu/nova-core/gsp/commands.rs | 60 ++++++++++++----\n drivers/gpu/nova-core/gsp/fw.rs | 4 ++\n drivers/gpu/nova-core/gsp/fw/commands.rs | 23 +++++++\n drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs | 8 +++\n drivers/gpu/nova-core/regs.rs | 5 ++\n rust/kernel/bug.rs | 10 +++\n 10 files changed, 197 insertions(+), 19 deletions(-)\n---\nbase-commit: b4e07588e743c989499ca24d49e752c074924a9a\nchange-id: 20251216-nova-unload-4029b3b76950\n\nBest regards,\n-- \nAlexandre Courbot "}