Re: [PATCH v3 0/7] drm: Add fbdev deferred io support to helpers

[Daniel Vetter <daniel@ffwll.ch>]

On Wed, Apr 27, 2016 at 09:49:49PM +0200, Noralf Trønnes wrote:
> 
> Den 27.04.2016 21:24, skrev Daniel Vetter:
> >On Wed, Apr 27, 2016 at 08:16:29PM +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 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
> >Found two tiny nit in the drm fbdev helper patch. Otherwise I think just needs
> >an ack from Tomi for the fbdev patch, and from Laurent Pinchart for the
> >cma one (you've forgotten to cc him) and this is good to land imo.
> >-Daniel
> 
> Laurent has been cc'ed on the entire patchset.
> Should I have added cc: laurent.pinchart@ideasonboard.com in the
> cma commit message instead?
> 
> I'm not sure who should get what in a patchset like this.
> I use git send-email, and have included all parties for the entire patchset,
> but should Tomi for instance have received only the fbdev patch and
> nothing else?

Ah no worries, you've done right. I simply somehow didn't see the cc:
laurent. Wrt explicit Cc: in patches: I kinda prefer those, since once
merged and you have questions about a patch you still know whom to ping
(e.g. when it causes a regressions). Whereas cc's just in the mail headers
will be lost once merged.

Wrt cc'ing on all patches or just individual ones: People have different
ideas on that. Within the same subsystem I tend to cc just individual
relevant patches (using Cc: in the commit message), across subsystem
mailing lists I think cc'ing on everything is better (for full context).
-Daniel

> 
> Noralf.
> 
> >>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
> >>
> >>  drivers/gpu/drm/Kconfig             |   1 +
> >>  drivers/gpu/drm/drm_fb_cma_helper.c | 178 ++++++++++++++++++++++++++--
> >>  drivers/gpu/drm/drm_fb_helper.c     | 109 +++++++++++++++++-
> >>  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, 378 insertions(+), 328 deletions(-)
> >>
> >>--
> >>2.2.2
> >>
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch