linux-kernel - Re: [PATCH v4 0/7] drm: Add fbdev deferred io support to helpers

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Message-ID: <20160429145705.GD14148@phenom.ffwll.local>
Date:	Fri, 29 Apr 2016 16:57:05 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Noralf Trønnes <noralf@...nnes.org>
Cc:	dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
	daniel@...ll.ch, laurent.pinchart@...asonboard.com,
	tomi.valkeinen@...com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/7] drm: Add fbdev deferred io support to helpers

On Thu, Apr 28, 2016 at 05:18:30PM +0200, Noralf Trønnes wrote:
> This patchset adds fbdev deferred io support to drm_fb_helper and
> drm_fb_cma_helper.
> 
> It channels fbdev mmap and fb_{write,fillrect,copyarea,imageblit} damage
> through the (struct drm_framebuffer_funcs)->dirty callback on the
> fb_helper framebuffer which will always run in process context.
> 
> I have also added patches that converts qxl and udl to use this
> deferred io support. I have only compile tested it, no functional testing.
> I know that qxl is purely a software thing so I could actually test it, but
> I have never used qemu so I'm not keen on spending a lot of time on that.
> 
> This was originally part of the tinydrm patchset.
> 
> Changes since v3:
> - drm/fb-helper: Add fb_deferred_io support
>   - Don't use forward decl, move drm_fb_helper_dirty_work()
>   - Use DIV_ROUND_UP in drm_fb_helper_deferred_io()
> 
> Changes since v2:
> - drm/rect: Add some drm_clip_rect utility functions
>   - This patch is dropped
> - drm/fb-helper: Add fb_deferred_io support
>   - FB_DEFERRED_IO is now always selected by DRM_KMS_FB_HELPER, ifdef removed
>   - The drm_clip_rect utility functions are dropped, so open code it
>   - docs: use & to denote structs
> - drm/qxl: Use drm_fb_helper deferred_io support
>   - The drm_clip_rect_{width/height} functions are dropped, so open code it
> 
> Changes since v1:
> - drm/fb-helper: Add fb_deferred_io support
>   - Use a dedicated worker to run the framebuffer flushing like qxl does
>   - Add parameter descriptions to drm_fb_helper_deferred_io
> - fbdev: fb_defio: Export fb_deferred_io_mmap
>   - Expand commit message
> - drm/qxl: Use drm_fb_helper deferred_io support
>   - Add FIXME about special dirty() callback for fbdev
>   - Remove note in commit message about deferred worker, drm_fb_helper
>     is similar to qxl now.
> - drm/udl: Use drm_fb_helper deferred_io support
>   - No need to enable deferred_io by default since drm_fb_helper uses
>     a dedicated worker for flushing
> 
> Changes since RFC:
> - Fix drm_clip_rect use to be exclusive on x2/y2
> - Put drm_clip_rect functions in drm_rect.{h,c}
> - Take into account that (struct fb_ops *)->fb_{write,...}() can be called
>   from atomic context (spin_lock_irqsave)
> - Export fb_deferred_io_mmap()
> - Add some more documentation
> - Add qxl and udl patches
> 
> Noralf Trønnes (7):
>   drm/udl: Change drm_fb_helper_sys_*() calls to sys_*()
>   drm/qxl: Change drm_fb_helper_sys_*() calls to sys_*()
>   drm/fb-helper: Add fb_deferred_io support
>   fbdev: fb_defio: Export fb_deferred_io_mmap
>   drm/fb-cma-helper: Add fb_deferred_io support
>   drm/qxl: Use drm_fb_helper deferred_io support
>   drm/udl: Use drm_fb_helper deferred_io support

Scrolled through them all once more, and didn't spot anything else. Great
work! I plan to pull it all into drm-misc next week for 4.7 still. Please
ping me in case I forget.
-Daniel

> 
>  drivers/gpu/drm/Kconfig             |   1 +
>  drivers/gpu/drm/drm_fb_cma_helper.c | 178 ++++++++++++++++++++++++++--
>  drivers/gpu/drm/drm_fb_helper.c     | 103 ++++++++++++++++-
>  drivers/gpu/drm/qxl/qxl_display.c   |   9 +-
>  drivers/gpu/drm/qxl/qxl_drv.h       |   7 +-
>  drivers/gpu/drm/qxl/qxl_fb.c        | 223 +++++++++---------------------------
>  drivers/gpu/drm/qxl/qxl_kms.c       |   4 -
>  drivers/gpu/drm/udl/udl_drv.h       |   2 -
>  drivers/gpu/drm/udl/udl_fb.c        | 140 +---------------------
>  drivers/video/fbdev/core/fb_defio.c |   3 +-
>  include/drm/drm_fb_cma_helper.h     |  14 +++
>  include/drm/drm_fb_helper.h         |  15 +++
>  include/linux/fb.h                  |   1 +
>  13 files changed, 372 insertions(+), 328 deletions(-)
> 
> --
> 2.2.2
> 

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