[v3,0/7] drm/panfrost: drm/panfrost: Add a new submit ioctl

Message

Boris Brezillon July 2, 2021, 2:32 p.m. UTC

Hello,

This is an attempt at providing a new submit ioctl that's more
Vulkan-friendly than the existing one. This ioctl

1/ allows passing several out syncobjs so we can easily update
   several fence/semaphore in a single ioctl() call
2/ allows passing several jobs so we don't have to have one ioctl
   per job-chain recorded in the command buffer
3/ supports disabling implicit dependencies as well as 
   non-exclusive access to BOs, thus removing unnecessary
   synchronization

I've also been looking at adding {IN,OUT}_FENCE_FD support (allowing
one to pass at most one sync_file object in input and/or creating a
sync_file FD embedding the render out fence), but it's not entirely
clear to me when that's useful. Indeed, we can already do the
sync_file <-> syncobj conversion using the
SYNCOBJ_{FD_TO_HANDLE,HANDLE_TO_FD} ioctls if we have to.
Note that, unlike Turnip, PanVk is using syncobjs to implement
vkQueueWaitIdle(), so the syncobj -> sync_file conversion doesn't
have to happen for each submission, but maybe there's a good reason
to use sync_files for that too. Any feedback on that aspect would
be useful I guess.

Any feedback on this new ioctl is welcome, in particular, do you
think other things are missing/would be nice to have for Vulkan?

Regards,

Boris

P.S.: basic igt tests for these new ioctls re available there [1]

[1]https://gitlab.freedesktop.org/bbrezillon/igt-gpu-tools/-/tree/panfrost-batch-submit

Changes in v3:
* Fix a deadlock in the submitqueue logic
* Limit the number of submitqueue per context to 16

Boris Brezillon (7):
  drm/panfrost: Pass a job to panfrost_{acquire,attach}_object_fences()
  drm/panfrost: Move the mappings collection out of
    panfrost_lookup_bos()
  drm/panfrost: Add BO access flags to relax dependencies between jobs
  drm/panfrost: Add the ability to create submit queues
  drm/panfrost: Add a new ioctl to submit batches
  drm/panfrost: Advertise the SYNCOBJ_TIMELINE feature
  drm/panfrost: Bump minor version to reflect the feature additions

 drivers/gpu/drm/panfrost/Makefile             |   3 +-
 drivers/gpu/drm/panfrost/panfrost_device.h    |   2 +-
 drivers/gpu/drm/panfrost/panfrost_drv.c       | 463 ++++++++++++++----
 drivers/gpu/drm/panfrost/panfrost_job.c       |  89 ++--
 drivers/gpu/drm/panfrost/panfrost_job.h       |  10 +-
 .../gpu/drm/panfrost/panfrost_submitqueue.c   | 136 +++++
 .../gpu/drm/panfrost/panfrost_submitqueue.h   |  27 +
 include/uapi/drm/panfrost_drm.h               | 103 ++++
 8 files changed, 689 insertions(+), 144 deletions(-)
 create mode 100644 drivers/gpu/drm/panfrost/panfrost_submitqueue.c
 create mode 100644 drivers/gpu/drm/panfrost/panfrost_submitqueue.h