[v2,00/10] drm/bochs: Modernize driver

Message

Thomas Zimmermann Sept. 2, 2024, 10:53 a.m. UTC

(was: rm/bochs: Modernize driver)

Bochs is lagging behind the overall state of DRM. This series gives
the driver an update.

Patch 1 removes duplicated functionality that is already handled
by the DRM core.

Patches 2 and 3 streamlines driver cleanup. Patch 2 reworks EDID
handling to follow current best practices. All buffers with EDID
data will now be cleaned up automatically. Patch 3 adds managed
cleanups for I/O resources. No fini function is needed.

Patches 4 to 6 embed struct drm_device in struct bochs_device and
remove all uses of dev_private.

Patch 7 replaces simple display helpers with regular atomic helpers.
The former are a mid-layer that is more often 'in the way' than helping.
Regular atomic helpers are composable with each other. Simple-pipe
is not.

Patch 8 replaces GEM VRAM with GEM SHMEM. The new memory manager
is more reliable and allows for larger resolutions. Display updates
were so slow that Gnome was unmanageable with a flickering cursor and
single FPS. The new memory management makes Gnome at least useable.

Patch 9 implements display-mode validation against the available video
memory. Modes should now be useable iff they passed mode_valid.

Patch 10 removes code from GEM VRAM helpers that is now no longer in
use.

Tested with qemu emulation.

v2:
- fix linker error (kernel test robot)
- fix mode validation

Thomas Zimmermann (10):
  drm/bochs: Remove manual format test from fb_create
  drm/bochs: Use helpers for struct drm_edid
  drm/bochs: Do managed resource cleanup
  drm/bochs: Pass bochs device to various functions
  drm/bochs: Upcast with to_bochs_device()
  drm/bochs: Allocate DRM device in struct bochs_device
  drm/bochs: Use regular atomic helpers
  drm/bochs: Use GEM SHMEM helpers for memory management
  drm/bochs: Validate display modes against available video memory
  drm/gem-vram: Remove support for simple display pipelines

 drivers/gpu/drm/drm_gem_vram_helper.c |  45 ---
 drivers/gpu/drm/tiny/Kconfig          |   4 +-
 drivers/gpu/drm/tiny/bochs.c          | 384 +++++++++++++++-----------
 include/drm/drm_gem_vram_helper.h     |  13 -
 4 files changed, 224 insertions(+), 222 deletions(-)