This patchset adds support for emulating virtual hardware with VKMS. The virtual hardware mode can be enabled by using the following command while loading the module: sudo modprobe vkms enable_virtual_hw=1
The first patch is prep work for adding virtual_hw mode and refactors the plane composition in vkms by adding a helper function vkms_composer_common() which can be used for both vblank mode and virtual mode.
The second patch adds virtual hardware support as a module option. The second patch adds new atomic helper functions for the virtual mode and modifies the existing atomic helpers for usage by the vblank mode This gives us two sets of drm_crtc_helper_funcs struct for both modes, making the code flow cleaner and easier to debug.
This patchset has been tested with the igt tests, kms_writeback, kms_atomic, kms_lease, kms_flip, kms_pipe_get_crc and preserves results except for subtests related to crc reads and skips tests that rely on vertical blanking. This patchset must be tested after incorporating the igt-tests patch: https://lists.freedesktop.org/archives/igt-dev/2021-February/029355.html
Sumera Priyadarsini (2): drm/vkms: Refactor vkms_composer_worker() to prep for virtual_hw mode drm/vkms: Add support for virtual hardware mode
drivers/gpu/drm/vkms/vkms_composer.c | 88 +++++++++++++++++----------- drivers/gpu/drm/vkms/vkms_crtc.c | 51 +++++++++++----- drivers/gpu/drm/vkms/vkms_drv.c | 18 ++++-- drivers/gpu/drm/vkms/vkms_drv.h | 4 ++ 4 files changed, 109 insertions(+), 52 deletions(-)