linux-kernel - [PATCH V6 0/2] drm/vkms: Add virtual hardware module

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Date:   Wed, 1 Sep 2021 22:10:49 +0530
From:   Sumera Priyadarsini <sylphrenadin@...il.com>
To:     melissa.srw@...il.com
Cc:     rodrigosiqueiramelo@...il.com, hamohammed.sa@...il.com,
        daniel@...ll.ch, airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH V6 0/2] drm/vkms: Add virtual hardware module

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.
It adds new atomic helper functions for the virtual mode
and uses the existing atomic helpers for vblank mode
This gives us two sets of drm_crtc_funcs and drm_crtc_helper_funcs
structs 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 vertical blanking, in which case,
tests are skipped.

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  | 92 +++++++++++++++++----------
 drivers/gpu/drm/vkms/vkms_crtc.c      | 43 ++++++++++++-
 drivers/gpu/drm/vkms/vkms_drv.c       | 16 +++--
 drivers/gpu/drm/vkms/vkms_drv.h       |  4 ++
 drivers/gpu/drm/vkms/vkms_writeback.c |  3 +-
 5 files changed, 117 insertions(+), 41 deletions(-)

-- 
2.31.1