[RFC v3 00/12] drm: Add generic fbdev emulation

[Noralf Trønnes]

This patchset explores the possibility of having generic fbdev emulation
in DRM for drivers that supports dumb buffers which they can export.

The change this time is that I have tried to do an in-kernel client API.
The intention was to have callbacks on the drm_file, but I gave up on
that mainly because I have to take a ref on the driver module since
drm_driver->postclose is called in drm_file_free(). This blocks DRM
driver module unload. Another reason is that the callback signalling new
drm_devices would have to be out-of-band so I put all the callbacks
together.

The patchset includes 3 different clients that I have done to see how it
is to use the API:
- fbdev
- bootsplash
- VT console

There is still work left to be done, but it would be nice to get some
feedback about the direction I have taken.

For readers I suggest to first look at the bootsplash client to see the
API in use. The client is very simple so it's an easy read.

Noralf.

Changes since version 2:
- Don't set drm master for in-kernel clients. (Daniel Vetter)
- Add in-kernel client API

Changes since version 1:
- Don't add drm_fb_helper_fb_open() and drm_fb_helper_fb_release() to
  DRM_FB_HELPER_DEFAULT_OPS(). (Fi.CI.STATIC)
  The following uses that macro and sets fb_open/close: udlfb_ops,
  amdgpufb_ops, drm_fb_helper_generic_fbdev_ops, nouveau_fbcon_ops,
  nouveau_fbcon_sw_ops, radeonfb_ops.
  This results in: warning: Initializer entry defined twice
- Support CONFIG_DRM_KMS_HELPER=m (kbuild test robot)
  ERROR: <function> [drivers/gpu/drm/drm_kms_helper.ko] undefined!
- Drop buggy patch: (Chris Wilson)
  drm/prime: Clear drm_gem_object->dma_buf on release
- Defer buffer creation until fb_open.

David Herrmann (1):
  drm: provide management functions for drm_file

Noralf Trønnes (11):
  drm/file: Don't set master on in-kernel clients
  drm: Make ioctls available for in-kernel clients part 1
  drm: Make ioctls available for in-kernel clients part 2
  drm: Add _ioctl suffix to some functions
  drm: Add DRM device iterator
  drm/modes: Add drm_umode_equal()
  drm/framebuffer: Add drm_mode_can_dirtyfb()
  drm: Add API for in-kernel clients
  drm/client: Add fbdev emulation client
  drm/client: Add bootsplash client
  drm/client: Add VT console client

 drivers/gpu/drm/Kconfig                 |    2 +
 drivers/gpu/drm/Makefile                |    3 +-
 drivers/gpu/drm/client/Kconfig          |   30 +
 drivers/gpu/drm/client/Makefile         |    5 +
 drivers/gpu/drm/client/drm_bootsplash.c |  205 ++++
 drivers/gpu/drm/client/drm_client.c     | 1612 +++++++++++++++++++++++++++++++
 drivers/gpu/drm/client/drm_fbdev.c      |  997 +++++++++++++++++++
 drivers/gpu/drm/client/drm_vtcon.c      |  760 +++++++++++++++
 drivers/gpu/drm/drm_connector.c         |   50 +-
 drivers/gpu/drm/drm_crtc.c              |   47 +-
 drivers/gpu/drm/drm_crtc_internal.h     |   80 +-
 drivers/gpu/drm/drm_drv.c               |   66 ++
 drivers/gpu/drm/drm_dumb_buffers.c      |   33 +-
 drivers/gpu/drm/drm_encoder.c           |   10 +-
 drivers/gpu/drm/drm_file.c              |  304 +++---
 drivers/gpu/drm/drm_framebuffer.c       |  149 ++-
 drivers/gpu/drm/drm_internal.h          |    7 +
 drivers/gpu/drm/drm_ioc32.c             |    2 +-
 drivers/gpu/drm/drm_ioctl.c             |   24 +-
 drivers/gpu/drm/drm_mode_config.c       |   81 +-
 drivers/gpu/drm/drm_mode_object.c       |   12 +-
 drivers/gpu/drm/drm_modes.c             |   50 +
 drivers/gpu/drm/drm_plane.c             |   24 +-
 drivers/gpu/drm/drm_prime.c             |   13 +-
 drivers/gpu/drm/drm_probe_helper.c      |    3 +
 drivers/gpu/drm/drm_vblank.c            |   11 +-
 include/drm/drm_client.h                |  192 ++++
 include/drm/drm_device.h                |    1 +
 include/drm/drm_drv.h                   |   34 +
 include/drm/drm_file.h                  |    7 +
 include/drm/drm_framebuffer.h           |    2 +
 include/drm/drm_modes.h                 |    2 +
 32 files changed, 4515 insertions(+), 303 deletions(-)
 create mode 100644 drivers/gpu/drm/client/Kconfig
 create mode 100644 drivers/gpu/drm/client/Makefile
 create mode 100644 drivers/gpu/drm/client/drm_bootsplash.c
 create mode 100644 drivers/gpu/drm/client/drm_client.c
 create mode 100644 drivers/gpu/drm/client/drm_fbdev.c
 create mode 100644 drivers/gpu/drm/client/drm_vtcon.c
 create mode 100644 include/drm/drm_client.h

-- 
2.15.1