drm/panfrost, panthor: Cached maps and explicit flushing

This series implements cached maps and explicit flushing for both panfrost
and panthor.

The PanVK MR to use this lives here:

https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests...

This version moves away from the code sharing proposed at the
drm_prime/gem_shmem level and hand-roll a bunch of things that
could potentially be shared. The goal here is to take the path
of least resistance and discuss this controversial code-sharing
topic in a follow-up MR. Keeping everyone Cc-ed on the previous
version involved, so they're aware of this change of direction,
sorry for the noise if you don't care :-/.

Changes in v2:
- Expose the coherency so userspace can know when it should skip cache
  maintenance
- Hook things up at drm_gem_object_funcs level to dma-buf cpu_prep hooks
  can be implemented generically
- Revisit the semantics of the flags passed to gem_sync()
- Add BO_QUERY_INFO ioctls to query BO flags on imported objects and
  let the UMD know when cache maintenance is needed on those

Changes in v3:
- New patch to fix panthor_gpu_coherency_set()
- No other major changes, check each patch changelog for more details

Changes in v4:
- Two trivial fixes, check each patch changelog for more details

Changes in v5:
- Add a way to overload dma_buf_ops while still relying on the drm_prime
  boilerplate
- Add default shmem implementation for
  dma_buf_ops::{begin,end}_cpu_access()
- Provide custom dma_buf_ops to deal with CPU cache flushes around CPU
  accesses when the BO is CPU-cacheable
- Go back to a version of drm_gem_shmem_sync() that only deals with
  cache maintenance, and adjust the semantics to make it clear this is
  the only thing it cares about
- Adjust the BO_SYNC ioctls according to the new drm_gem_shmem_sync()
  semantics

Changes in v6:
- No major changes, check the changelog in each patch for more details

Changes in v7:
- Drop the drm_prime/gem_shmem helpers and duplicate the logic in
  panthor/panfrost

Boris Brezillon (8):
  drm/panthor: Provide a custom dma_buf implementation
  drm/panthor: Fix panthor_gpu_coherency_set()
  drm/panthor: Expose the selected coherency protocol to the UMD
  drm/panthor: Add a PANTHOR_BO_SYNC ioctl
  drm/panthor: Add an ioctl to query BO flags
  drm/panfrost: Provide a custom dma_buf implementation
  drm/panfrost: Expose the selected coherency protocol to the UMD
  drm/panfrost: Add an ioctl to query BO flags

Faith Ekstrand (4):
  drm/panthor: Bump the driver version to 1.6
  drm/panfrost: Add a PANFROST_SYNC_BO ioctl
  drm/panfrost: Add flag to map GEM object Write-Back Cacheable
  drm/panfrost: Bump the driver version to 1.6

Loïc Molinari (1):
  drm/panthor: Add flag to map GEM object Write-Back Cacheable

 drivers/gpu/drm/panfrost/panfrost_device.h |   1 +
 drivers/gpu/drm/panfrost/panfrost_drv.c    | 101 ++++++++-
 drivers/gpu/drm/panfrost/panfrost_gem.c    | 240 +++++++++++++++++++++
 drivers/gpu/drm/panfrost/panfrost_gem.h    |  10 +
 drivers/gpu/drm/panfrost/panfrost_gpu.c    |  26 ++-
 drivers/gpu/drm/panfrost/panfrost_regs.h   |  10 +-
 drivers/gpu/drm/panthor/panthor_device.c   |  10 +-
 drivers/gpu/drm/panthor/panthor_drv.c      |  79 ++++++-
 drivers/gpu/drm/panthor/panthor_gem.c      | 240 ++++++++++++++++++++-
 drivers/gpu/drm/panthor/panthor_gem.h      |   6 +
 drivers/gpu/drm/panthor/panthor_gpu.c      |   2 +-
 drivers/gpu/drm/panthor/panthor_sched.c    |  18 +-
 include/uapi/drm/panfrost_drm.h            |  76 ++++++-
 include/uapi/drm/panthor_drm.h             | 157 +++++++++++++-
 14 files changed, 954 insertions(+), 22 deletions(-)

-- 
2.51.1