linux-kernel - [PATCH 0/4] PCI: Add support and tests for FIXUP quirks in modules

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Message-ID: <20250912230208.967129-1-briannorris@chromium.org>
Date: Fri, 12 Sep 2025 15:59:31 -0700
From: Brian Norris <briannorris@...omium.org>
To: Bjorn Helgaas <bhelgaas@...gle.com>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Petr Pavlu <petr.pavlu@...e.com>,
	Daniel Gomez <da.gomez@...nel.org>
Cc: linux-pci@...r.kernel.org,
	David Gow <davidgow@...gle.com>,
	Rae Moar <rmoar@...gle.com>,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-modules@...r.kernel.org,
	Johannes Berg <johannes@...solutions.net>,
	Sami Tolvanen <samitolvanen@...gle.com>,
	Richard Weinberger <richard@....at>,
	Wei Liu <wei.liu@...nel.org>,
	Brendan Higgins <brendan.higgins@...ux.dev>,
	kunit-dev@...glegroups.com,
	Anton Ivanov <anton.ivanov@...bridgegreys.com>,
	linux-um@...ts.infradead.org,
	Brian Norris <briannorris@...omium.org>
Subject: [PATCH 0/4] PCI: Add support and tests for FIXUP quirks in modules

This series primarily adds support for DECLARE_PCI_FIXUP_*() in modules.
There are a few drivers that already use this, and so they are
presumably broken when built as modules.

While at it, I wrote some unit tests that emulate a fake PCI device, and
let the PCI framework match/not-match its vendor/device IDs. This test
can be built into the kernel or built as a module.

I also include some infrastructure changes (patch 3 and 4), so that
ARCH=um (the default for kunit.py), ARCH=arm, and ARCH=arm64 will run
these tests by default. These patches have different maintainers and are
independent, so they can probably be picked up separately. I included
them because otherwise the tests in patch 2 aren't so easy to run.


Brian Norris (4):
  PCI: Support FIXUP quirks in modules
  PCI: Add KUnit tests for FIXUP quirks
  um: Select PCI_DOMAINS_GENERIC
  kunit: qemu_configs: Add PCI to arm, arm64

 arch/um/Kconfig                           |   1 +
 drivers/pci/Kconfig                       |  11 ++
 drivers/pci/Makefile                      |   1 +
 drivers/pci/fixup-test.c                  | 197 ++++++++++++++++++++++
 drivers/pci/quirks.c                      |  62 +++++++
 include/linux/module.h                    |  18 ++
 kernel/module/main.c                      |  26 +++
 tools/testing/kunit/qemu_configs/arm.py   |   1 +
 tools/testing/kunit/qemu_configs/arm64.py |   1 +
 9 files changed, 318 insertions(+)
 create mode 100644 drivers/pci/fixup-test.c

-- 
2.51.0.384.g4c02a37b29-goog