[PATCH 0/3] Tegra Host1x dma_fence/sync_file support

[Mikko Perttunen]

Hi everyone,

this series adds support for using sync fences as prefences and
postfences for host1x job submissions. The patches are available
as a git repository at

  https://github.com/cyndis/linux/tree/host1x-fence-1

and testing code is available at

  https://github.com/cyndis/host1x_test

though you may want to edit the main function to disable the
timeout tests for now as they cause a deadlock (not caused
by this series; fix upcoming).

Verified on a Jetson TX1; should go on top of the earlier
VIC series.

Some additional points:
* I noticed that the waitchk_mask field in the submit UAPI is completely
  useless, and has never had any effect in the upstream kernel.
  It has also not existed in the downstream kernel for many years.
  We could replace it with the flags field if that is deemed
  acceptable, though of course it is possible there exists some
  application that fills it with some non-zero value.
* Signaling is enabled for all host1x fences, not just those for
  which enable_signaling has been called. This is because
  enable_signaling is called from atomic context and we cannot set
  up an action waiter in atomic context.

Thanks,
Mikko

Mikko Perttunen (3):
  gpu: host1x: Add support for DMA fences
  drm/tegra: Add sync file support to submit interface
  drm/tegra: Support for sync file-based fences in submit

 drivers/gpu/drm/tegra/drm.c        |  69 +++++++++++--
 drivers/gpu/host1x/Kconfig         |   1 +
 drivers/gpu/host1x/Makefile        |   1 +
 drivers/gpu/host1x/dev.h           |  12 ++-
 drivers/gpu/host1x/fence.c         | 202 +++++++++++++++++++++++++++++++++++++
 drivers/gpu/host1x/fence.h         |  28 +++++
 drivers/gpu/host1x/hw/channel_hw.c |  36 +++++--
 drivers/gpu/host1x/intr.c          |  11 +-
 drivers/gpu/host1x/intr.h          |   8 +-
 drivers/gpu/host1x/syncpt.c        |   2 +
 include/linux/host1x.h             |  12 ++-
 include/uapi/drm/tegra_drm.h       |   8 +-
 12 files changed, 367 insertions(+), 23 deletions(-)
 create mode 100644 drivers/gpu/host1x/fence.c
 create mode 100644 drivers/gpu/host1x/fence.h

-- 
2.11.1