Adds helpers for maintaining aperture ownership. Currently wraps the infrastructure around fbdev's remove_conflicting_framebuffers(). For adding generic drivers to DRM, we need a hand-over mechanism that unloads the generic driver before loading the hardware's native driver. So far, this was supported for generic fbdev drivers, but not for DRM drivers. As a first step, this patchset provides a DRM interface to release ownership of a framebuffer aperture. When called, all generic drivers for framebuffers in the range are being unloaded. At this point the functions wrap similar fbdev functionality. The old fbdev-based interface is being inlined into the new functionsa and drivers are converted. The patchset is based on patches 3 and 4 of [1]. I incorporated the review comments and kept the acked-bys. All converted drivers have been built at least once on either x86-64, aarch64 or arm. [1] https://lore.kernel.org/dri-devel/20210318102921.21536-1-tzimmermann@xxxxxxx/ Thomas Zimmermann (3): drm/aperture: Add infrastructure for aperture ownership drm/aperture: Convert drivers to aperture interfaces drm/aperture: Inline fbdev conflict helpers into aperture helpers Documentation/gpu/drm-internals.rst | 12 ++ drivers/gpu/drm/Makefile | 2 +- drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 3 +- drivers/gpu/drm/armada/armada_drv.c | 5 +- drivers/gpu/drm/ast/ast_drv.c | 23 ++- drivers/gpu/drm/bochs/bochs_drv.c | 3 +- drivers/gpu/drm/drm_aperture.c | 131 ++++++++++++++++++ .../gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c | 4 +- drivers/gpu/drm/i915/i915_drv.c | 3 +- drivers/gpu/drm/meson/meson_drv.c | 27 ++-- drivers/gpu/drm/mgag200/mgag200_drv.c | 5 +- drivers/gpu/drm/msm/msm_fbdev.c | 5 +- drivers/gpu/drm/nouveau/nouveau_drm.c | 3 +- drivers/gpu/drm/qxl/qxl_drv.c | 5 +- drivers/gpu/drm/radeon/radeon_drv.c | 3 +- drivers/gpu/drm/sun4i/sun4i_drv.c | 5 +- drivers/gpu/drm/tegra/drm.c | 4 +- drivers/gpu/drm/tiny/cirrus.c | 3 +- drivers/gpu/drm/vboxvideo/vbox_drv.c | 3 +- drivers/gpu/drm/vc4/vc4_drv.c | 5 +- drivers/gpu/drm/virtio/virtgpu_drv.c | 10 +- drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 4 +- include/drm/drm_aperture.h | 31 +++++ include/drm/drm_fb_helper.h | 51 ------- 24 files changed, 242 insertions(+), 108 deletions(-) create mode 100644 drivers/gpu/drm/drm_aperture.c create mode 100644 include/drm/drm_aperture.h -- 2.31.1
