[PATCH v2 00/12] drm: Add generic fbdev emulation

[Noralf Trønnes]

Den 18.06.2018 16.17, skrev Noralf Trønnes:
> This patchset adds generic fbdev emulation for drivers that supports GEM
> based dumb buffers which support .gem_prime_vmap and gem_prime_mmap. An
> API is begun to support in-kernel clients in general.
>
> Notable changes since version 1:
>
> - Rework client unregister code. I've used reference counting to manage
>    the fact that both the client itself and the driver through
>    drm_dev_unregister() can release the client. The client is now released
>    using drm_client_put() instead of drm_client_free().
>
> - fbdev: Use a shadow buffer for framebuffers that have a dirty
>    callback. This makes the fbdev client truly generic and useable for all
>    drivers. There's a blitting penalty, but this is generic emulation after
>    all. The reason for needing a shadow buffer is that deferred I/O only
>    works with kmalloc/vmalloc buffers and not with shmem buffers
>    (page->lru/mapping).
>
> - Let tinydrm use the full fbdev client
>
> Noralf.
>
> Changes since version 1:
> - Make it possible to embed struct drm_client_dev and drop the private
>    pointer
> - Use kref reference counting to control client release since both the
>    client and the driver can release.
> - Add comment about using dma-buf as a possibility with some rework
> - Move buffer NULL check to drm_client_framebuffer_delete()
> - Move client name to struct drm_client_dev
> - Move up drm_dev_get/put calls to make them more visible
> - Move drm_client_dev.list definition to later patch that makes use of it
>
> - Embed drm_client at the beginning of drm_fb_helper to avoid a fragile
>    transitional kfree hack in drm_client_release()
> - Set owner in drm_fbdev_fb_ops
> - Add kerneldoc to drm_fb_helper_generic_probe()
>
> - Remove unused functions
> - Change name drm_client_funcs.lastclose -> .restore
> - Change name drm_client_funcs.remove -> .unregister
> - Rework unregister code
>
> - tinydrm: Use drm_fbdev_generic_setup() and remove
>    drm_fb_cma_fbdev_init_with_funcs()
>
> 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

Patches 1-3 applied to drm-misc-next. Thanks for reviewing!

Noralf.

>    drm: Begin an API for in-kernel clients
>    drm/fb-helper: Add generic fbdev emulation .fb_probe function
>    drm/pl111: Set .gem_prime_vmap and .gem_prime_mmap
>    drm/cma-helper: Use the generic fbdev emulation
>    drm/client: Add client callbacks
>    drm/debugfs: Add internal client debugfs file
>    drm/fb-helper: Finish the generic fbdev emulation
>    drm/tinydrm: Use drm_fbdev_generic_setup()
>    drm/cma-helper: Remove drm_fb_cma_fbdev_init_with_funcs()
>
>   Documentation/gpu/drm-client.rst            |  12 +
>   Documentation/gpu/index.rst                 |   1 +
>   drivers/gpu/drm/Makefile                    |   2 +-
>   drivers/gpu/drm/drm_client.c                | 435 ++++++++++++++++++++++++++++
>   drivers/gpu/drm/drm_crtc_internal.h         |  19 +-
>   drivers/gpu/drm/drm_debugfs.c               |   7 +
>   drivers/gpu/drm/drm_drv.c                   |   8 +
>   drivers/gpu/drm/drm_dumb_buffers.c          |  33 ++-
>   drivers/gpu/drm/drm_fb_cma_helper.c         | 380 +++---------------------
>   drivers/gpu/drm/drm_fb_helper.c             | 330 ++++++++++++++++++++-
>   drivers/gpu/drm/drm_file.c                  | 304 ++++++++++---------
>   drivers/gpu/drm/drm_framebuffer.c           |  42 ++-
>   drivers/gpu/drm/drm_internal.h              |   2 +
>   drivers/gpu/drm/drm_ioctl.c                 |   4 +-
>   drivers/gpu/drm/drm_probe_helper.c          |   3 +
>   drivers/gpu/drm/pl111/pl111_drv.c           |   2 +
>   drivers/gpu/drm/tinydrm/core/tinydrm-core.c |   3 +-
>   drivers/gpu/drm/tinydrm/ili9225.c           |   1 -
>   drivers/gpu/drm/tinydrm/mi0283qt.c          |   1 -
>   drivers/gpu/drm/tinydrm/st7586.c            |   1 -
>   drivers/gpu/drm/tinydrm/st7735r.c           |   1 -
>   include/drm/drm_client.h                    | 156 ++++++++++
>   include/drm/drm_device.h                    |  21 ++
>   include/drm/drm_fb_cma_helper.h             |   6 -
>   include/drm/drm_fb_helper.h                 |  38 +++
>   25 files changed, 1298 insertions(+), 514 deletions(-)
>   create mode 100644 Documentation/gpu/drm-client.rst
>   create mode 100644 drivers/gpu/drm/drm_client.c
>   create mode 100644 include/drm/drm_client.h
>