[PATCH v4 00/13] PRIME Synchronization

[Alex Goins]

Hello all,

These patches change the xserver to support setting up PRIME with double
buffering, and implement double buffered PRIME sink and source support in
the modesetting driver. In addition to these changes, I've upstreamed a
couple of patches to the i915 DRM driver that mesh with these, and have
implemented double buffered PRIME source support in the NVIDIA proprietary
driver (pending release.)

With this patch set you can test without needing the NVIDIA proprietary
driver. I tested with i915 as the sink and Nouveau as the source.

Before patches: http://i.imgur.com/favNJcA.jpg
After patches:  http://i.imgur.com/pUUZ6sE.jpg

They also improve performance significantly when using a modesetting source
by cutting down the number of copies to one per vblank.

Previous cover letters:
    v3: http://lists.x.org/archives/xorg-devel/2016-February/048677.html
    v2: http://lists.x.org/archives/xorg-devel/2016-January/048434.html
    v1: http://lists.x.org/archives/xorg-devel/2015-November/048039.html

The biggest change in this patch set from the last one is the
implementation of double buffered PRIME source support in the modesetting
driver. Note that this is a basic implementation designed to exercise all
of the new ABI functions. It lacks some of the more advanced functionality,
such as fenced asynchronous presentation, and OpenGL syncing to the sink's
vblank. The RRCrtcPtr argument to rrStartFlippingPixmapTracking() is
designed to make the source aware of which outputs are on the crtc for use
with OpenGL synchronization, but isn't used here. Everything else is
exercised.

The most notable change other than source support is disabling reverse
PRIME for Glamor-accelerated i915 sinks, the rationale for which can be
found in "modesetting: Disable Reverse PRIME for i915."

Aside from those, it's just a few bug fixes and style changes. The details
can be found in their respective changelogs.

Thanks, Alex @ NVIDIA Linux Driver Team

Alex Goins (13):
  xf86: Add PRIME flipping functions to Screen
  modesetting: scanout_pixmap_gpu one call only
  randr/xf86: Add PRIME Synchronization / Double Buffer
  randr: Add ability to turn PRIME sync off
  randr: Cleanup rrSetupPixmapSharing()
  modesetting: Properly clean up w/ PRIME syncing
  modesetting: Implement PRIME syncing as a sink
  modesetting: Fix mmap leak in scanout_pixmap_cpu
  modesetting: Suspend and resume flipping with DPMS
  modesetting: Blacklist UDL from PRIME sync
  modesetting: Disable Reverse PRIME for i915
  modesetting: Consistent whitespace in driver.c
  modesetting: Implement PRIME syncing as a source

 hw/xfree86/drivers/modesetting/driver.c          | 289 ++++++++++++++++++++---
 hw/xfree86/drivers/modesetting/drmmode_display.c | 281 ++++++++++++++++++++--
 hw/xfree86/drivers/modesetting/drmmode_display.h |  23 +-
 hw/xfree86/modes/xf86Crtc.h                      |   4 +
 hw/xfree86/modes/xf86RandR12.c                   |   4 +-
 include/scrnintstr.h                             |  14 ++
 randr/randrstr.h                                 |  17 ++
 randr/rrcrtc.c                                   | 164 +++++++++++--
 randr/rrprovider.c                               |  57 +++++
 9 files changed, 782 insertions(+), 71 deletions(-)

-- 
1.9.1