Re: [PATCH 00/25] drm: fb emulation: Step 1: Create new drm_fb_helper wrapper funcs

[Daniel Vetter <daniel@ffwll.ch>]

On Mon, Jul 13, 2015 at 12:07:56PM +0530, Archit Taneja wrote:
> DRM drivers using drm_fb_helpers still call some fbdev core functions.
> This makes the driver depend on CONFIG_FB, resulting in complicated
> Kconfig options, and preventing us from creating a top level drm config
> option to enable/disable FBDEV emulation.
> 
> Create new drm_fb_helper functions that replace these fbdev functions.
> 
> In most cases, the new helper funcs simply wrap around the original fbdev
> functions. For a few (like framebufer_alloc), we actually do some work
> that is currently redundant across multiple drivers.
> 
> With these patches, the drivers don't call any fbdev functions directly.
> They are now called through functions in drm_fb_helper.c. We will later
> create a fbdev emulation config option to stub out the fb helpers.
> 
> The only exception is vmwgfx driver. This doesn't use drm_fb_helper. It
> creates a fb device how a driver in drivers/video/fbdev would. Maybe this
> needs to be converted to use drm_fb_helpers.
> 
> For more info, have a look at the threads:
> http://lists.freedesktop.org/archives/dri-devel/2015-March/078729.html
> http://lists.freedesktop.org/archives/dri-devel/2015-March/078975.html

I think overall this looks really nice. I quickly fired this up on an i915
machine and it worked, so I pulled it all into topic/drm-misc (which is in
linux-next) to give this the testing it needs. I'll probably do a separate
topic branch for the pull request to Dave with the final patches. My plan
would be to make one overall pull for step 1 plus the first patch of step
2. Then everything else could go in through driver maintainers like usual
I think.

Cheers, Daniel

> 
> Archit Taneja (25):
>   drm/fb_helper: Add drm_fb_helper functions to manage fb_info creation
>   drm/fb_helper: Create a wrapper for unlink_framebuffer
>   drm/fb_helper: Create wrappers for fb_sys_read/write funcs
>   drm/fb_helper: Create wrappers for blit, copyarea and fillrect funcs
>   drm/fb_helper: Create a wrapper for fb_set_suspend
>   drm/fb_helper: Create a wrapper for remove_conflicting_framebuffers
>   drm/cirrus: Use new drm_fb_helper functions
>   drm/rockchip: Use new drm_fb_helper functions
>   drm/armada: Use new drm_fb_helper functions
>   drm/ast: Use new drm_fb_helper functions
>   drm/omap: Use new drm_fb_helper functions
>   drm/tegra: Use new drm_fb_helper functions
>   drm/msm: Use new drm_fb_helper functions
>   drm/exynos: Use new drm_fb_helper functions
>   drm/gma500: Use new drm_fb_helper functions
>   drm/mgag200: Use new drm_fb_helper functions
>   drm/radeon: Use new drm_fb_helper functions
>   drm/qxl: Use new drm_fb_helper functions
>   drm/i915: Use new drm_fb_helper functions
>   drm/nouveau: Use new drm_fb_helper functions
>   drm/udl: Use new drm_fb_helper functions
>   drm/boschs: Use new drm_fb_helper functions
>   drm/amdgpu: Use new drm_fb_helper functions
>   drm/virtio: Use new drm_fb_helper functions
>   drm/fb_cma_helper: Use new drm_fb_helper functions
> 
>  drivers/gpu/drm/Kconfig                       |   7 ++
>  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c       |   4 +-
>  drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c        |  43 +++-----
>  drivers/gpu/drm/armada/armada_fbdev.c         |  33 ++----
>  drivers/gpu/drm/ast/ast_fb.c                  |  47 +++------
>  drivers/gpu/drm/bochs/bochs_drv.c             |   6 +-
>  drivers/gpu/drm/bochs/bochs_fbdev.c           |  34 ++----
>  drivers/gpu/drm/cirrus/cirrus_drv.c           |   7 +-
>  drivers/gpu/drm/cirrus/cirrus_fbdev.c         |  39 ++-----
>  drivers/gpu/drm/drm_fb_cma_helper.c           |  45 ++------
>  drivers/gpu/drm/drm_fb_helper.c               | 142 ++++++++++++++++++++++++++
>  drivers/gpu/drm/exynos/exynos_drm_fbdev.c     |  45 +++-----
>  drivers/gpu/drm/gma500/accel_2d.c             |   6 +-
>  drivers/gpu/drm/gma500/framebuffer.c          |  47 +++------
>  drivers/gpu/drm/i915/i915_dma.c               |   3 +-
>  drivers/gpu/drm/i915/intel_fbdev.c            |  40 +++-----
>  drivers/gpu/drm/mgag200/mgag200_drv.c         |   3 +-
>  drivers/gpu/drm/mgag200/mgag200_fb.c          |  36 ++-----
>  drivers/gpu/drm/mgag200/mgag200_main.c        |   2 +-
>  drivers/gpu/drm/msm/msm_fbdev.c               |  34 ++----
>  drivers/gpu/drm/nouveau/nouveau_drm.c         |   3 +-
>  drivers/gpu/drm/nouveau/nouveau_fbcon.c       |  38 +++----
>  drivers/gpu/drm/omapdrm/omap_fbdev.c          |  34 ++----
>  drivers/gpu/drm/qxl/qxl_fb.c                  |  40 +++-----
>  drivers/gpu/drm/radeon/radeon_drv.c           |   4 +-
>  drivers/gpu/drm/radeon/radeon_fb.c            |  41 +++-----
>  drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c |  47 +++------
>  drivers/gpu/drm/tegra/fb.c                    |  40 +++-----
>  drivers/gpu/drm/udl/udl_fb.c                  |  40 +++-----
>  drivers/gpu/drm/virtio/virtgpu_drm_bus.c      |   3 +-
>  drivers/gpu/drm/virtio/virtgpu_fb.c           |  30 ++----
>  include/drm/drm_fb_helper.h                   |  30 ++++++
>  32 files changed, 426 insertions(+), 547 deletions(-)
> 
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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