[PATCH v2 00/12] AMDGPU doorbell manager

[Shashank Sharma]

Doorbells in AMDGPU drivers are currently managed by different clients
in a scattered way, across may places. The existing clients are:
- AMDGPU graphics driver for kernel level doorbell writes.
- AMDGPU MES module for kernel level doorbell write (MES ring test and
  aggregated doorbells).
- AMDGPU MES module for MES process doorbells.
- AMDKFD module for KFD/KIQ kernel doorbells.
- AMDKFD module for KFD process doorbells.
- AMDGPU usermode queues for usermode doorbell writes (upcoming).

This patch series introduces doorbell-manager to keep the doorbell
handling at a central place. The fundamental changes are:
- Introduce and accommodate a new GEM domain for doorbells.
- Prepare the AMDGPU ttm backend for handling doorbell allocation.
- Create doorbell BOs for kernel-level and process level doorbell
  opertations, and place it in existing structures.
- Modify the existing graphics, KFD and MES code to use the
  doorbell-manager functions.
- Remove the existing doorbell management code in KFD/MES.

The idea is that:
- a kernel client can call doorbell manager functions to allocate/free
  doorbell pages.
- a usermode app can directly allocate a page from the doorbell bar just
  like a GEM object and use it for different usermode queues.
- There is no direct UAPI change in this series, just an additional flag
  for GEM_OBJECT_DOORBELL, here:
  https://gitlab.freedesktop.org/mesa/drm/-/merge_requests/286

PS: This series has been sanity tested with kfd_test_suit to ensure
    it is not introducing any regressions due to kfd doorbell changes.

Alex Deucher (2):
  drm/amdgpu: add UAPI for allocating doorbell memory
  drm/amdgpu: accommodate DOMAIN/PL_DOORBELL

Shashank Sharma (10):
  drm/amdgpu: create a new file for doorbell manager
  drm/amdgpu: don't modify num_doorbells for mes
  drm/amdgpu: initialize ttm for doorbells
  drm/amdgpu: create kernel doorbell pages
  get absolute offset from doorbell index
  drm/amdgpu: use doorbell manager for kfd kernel doorbells
  drm/amdgpu: use doorbell manager for kfd process doorbells
  drm/amdgpu: remove unused functions and variables
  drm/amdgpu: use doorbell mgr for MES kernel doorbells
  drm/amdgpu: cleanup MES process level doorbells

 drivers/gpu/drm/amd/amdgpu/Makefile           |   2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c    | 174 +------------
 drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell.h  |  17 +-
 .../gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c  | 230 ++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c       | 148 +++--------
 drivers/gpu/drm/amd/amdgpu/amdgpu_mes.h       |  16 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c    |  11 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.h    |   2 +
 .../gpu/drm/amd/amdgpu/amdgpu_res_cursor.h    |   2 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c       |  30 ++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h       |   1 +
 drivers/gpu/drm/amd/amdkfd/kfd_chardev.c      |  13 -
 drivers/gpu/drm/amd/amdkfd/kfd_device.c       |   2 -
 .../drm/amd/amdkfd/kfd_device_queue_manager.c |   8 +-
 drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c     | 207 +++++-----------
 drivers/gpu/drm/amd/amdkfd/kfd_priv.h         |  27 +-
 drivers/gpu/drm/amd/amdkfd/kfd_process.c      |  21 +-
 .../amd/amdkfd/kfd_process_queue_manager.c    |  22 +-
 include/uapi/drm/amdgpu_drm.h                 |   7 +-
 19 files changed, 446 insertions(+), 494 deletions(-)
 create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c

-- 
2.40.0