On Wed, Apr 27, 2016 at 09:49:49PM +0200, Noralf Trønnes wrote:

Den 27.04.2016 21:24, skrev Daniel Vetter:

quoted

On Wed, Apr 27, 2016 at 08:16:29PM +0200, Noralf Trønnes wrote:

quoted

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.

quoted

quoted

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