[RFC v2 0/8] 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.

Chris pointed out a bug in the previous version. I've solved this by
deferring buffer creation until fb_ops->fb_open. This works fine for
fbcon as well, since the first thing it does is to call fb_open.

I also had to export some functions for modular builds.

Noralf.

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 (7):
  drm/ioctl: Remove trailing whitespace
  drm: Export some ioctl functions
  drm/fb-helper: Ensure driver module is pinned in fb_open()
  drm/fb-helper: Don't restore if fbdev is not in use
  drm: Handle fbdev emulation in core
  drm/fb-helper: Add generic fbdev emulation
  drm/vc4: Test generic fbdev emulation

 drivers/gpu/drm/drm_auth.c          |   1 +
 drivers/gpu/drm/drm_crtc_internal.h |   4 -
 drivers/gpu/drm/drm_dumb_buffers.c  |   1 +
 drivers/gpu/drm/drm_fb_helper.c     | 356 +++++++++++++++++++++++++++++++++++-
 drivers/gpu/drm/drm_file.c          | 323 ++++++++++++++++++--------------
 drivers/gpu/drm/drm_framebuffer.c   |   1 +
 drivers/gpu/drm/drm_internal.h      |   4 -
 drivers/gpu/drm/drm_ioctl.c         |   5 +-
 drivers/gpu/drm/drm_mode_config.c   |  10 +
 drivers/gpu/drm/drm_prime.c         |   1 +
 drivers/gpu/drm/drm_probe_helper.c  |   4 +
 drivers/gpu/drm/vc4/vc4_drv.c       |   3 -
 drivers/gpu/drm/vc4/vc4_kms.c       |   3 +-
 include/drm/drm_auth.h              |   3 +
 include/drm/drm_dumb_buffers.h      |  10 +
 include/drm/drm_fb_helper.h         |  93 ++++++++++
 include/drm/drm_file.h              |   2 +
 include/drm/drm_framebuffer.h       |   3 +
 include/drm/drm_prime.h             |   2 +
 19 files changed, 680 insertions(+), 149 deletions(-)
 create mode 100644 include/drm/drm_dumb_buffers.h

-- 
2.14.2