(I'm taking over this patchset from Alex, [1] as we agreed that it should go through the drm-misc tree.)
When assigning a primary graphics device to VM through vfio-pci device assignment, users often prevent binding of the native PCI graphics driver to avoid device initialization conflicts, however firmware console drivers may still be attached to the device which can often be cumbersome to manually unbind or exclude via cmdline options.
This series proposes to move the DRM aperture helpers out to drivers/video/ to make it more accessible to drivers like vfio-pci, which have neither dependencies on DRM code nor a struct drm_driver to present to existing interfaces. vfio-pci can then trivially call into the aperture helpers to remove conflicting drivers, rather than open coding it ourselves as was proposed with a new symbol export in v1 of this series. [2]
v3: * add aperture_ prefix to all interfaces (Javier) * improved documentation (Javier) * update MAINTAINERS [3] and add aperture helpers
[1] https://lore.kernel.org/all/165541020563.1955826.16350888595945658159.stgit@... [2] https://lore.kernel.org/all/165453797543.3592816.6381793341352595461.stgit@o... [3] https://lore.kernel.org/all/20220518183006.14548-2-tzimmermann@suse.de/
Alex Williamson (1): vfio/pci: Remove console drivers
Thomas Zimmermann (2): MAINTAINERS: Broaden scope of simpledrm entry drm: Implement DRM aperture helpers under video/
Documentation/driver-api/aperture.rst | 13 + Documentation/driver-api/index.rst | 1 + MAINTAINERS | 6 +- drivers/gpu/drm/drm_aperture.c | 178 +------------ drivers/gpu/drm/tiny/Kconfig | 1 + drivers/vfio/pci/vfio_pci_core.c | 5 + drivers/video/Kconfig | 6 + drivers/video/Makefile | 2 + drivers/video/aperture.c | 351 ++++++++++++++++++++++++++ drivers/video/console/Kconfig | 1 + drivers/video/fbdev/Kconfig | 7 +- include/linux/aperture.h | 56 ++++ 12 files changed, 456 insertions(+), 171 deletions(-) create mode 100644 Documentation/driver-api/aperture.rst create mode 100644 drivers/video/aperture.c create mode 100644 include/linux/aperture.h
base-commit: 7025c1f111b7a057243de45bd56c14b906242a53