[PATCH 0/6] Usermode queue fencing synchronization

[Arunpravin Paneer Selvam]

This patch series introduces fence drivers for usermode graphics
queues synchronization.

The idea here is, we insert a hardware fence signal command at the end of user process
graphics rendering commands and the creates a fence using the current wptr. On the
Otherhand, a process required to access these shared resources should wait on the
fence address/wptr value provided by the driver through wait ioctl function.
Here the hardware/firmware supposed to write the read pointer into fence address.
Hence the process waiting on the fence address equating the fence address (wptr) >= rptr,
before start consuming the buffers. This way we achieve the implicit synchronization
among userspace process for the shared resources.

The core usermode queue and doorbell design patches in review are seen below
which are prerequisites for this work.
Task 1: https://patchwork.freedesktop.org/series/114065/
Task 2: https://patchwork.freedesktop.org/series/113669/#rev2

Alex Deucher (1):
  drm/amdgpu: UAPI headers for userqueue Secure semaphore

Arunpravin Paneer Selvam (5):
  drm/amdgpu: Implement a new 64bit sequence memory driver
  drm/amdgpu: Implement a new userqueue fence driver
  drm/amdgpu: Add mqd support for the fence address
  drm/amdgpu: Implement userqueue signal/wait IOCTL functions
  drm/amdgpu: Enable userqueue fence interrupt handling support

 drivers/gpu/drm/amd/amdgpu/Makefile           |   2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu.h           |   8 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c    |   8 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c       |   9 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c       |  13 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_seq64.c     | 158 ++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_seq64.h     |  48 ++
 .../gpu/drm/amd/amdgpu/amdgpu_userq_fence.c   | 512 ++++++++++++++++++
 .../gpu/drm/amd/amdgpu/amdgpu_userq_fence.h   |  68 +++
 drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c |  21 +
 .../amd/amdgpu/amdgpu_userqueue_mqd_gfx_v11.c |   4 +
 drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c        |  20 +-
 .../gpu/drm/amd/include/amdgpu_userqueue.h    |   2 +
 drivers/gpu/drm/amd/include/v11_structs.h     |   4 +-
 include/uapi/drm/amdgpu_drm.h                 |  46 ++
 15 files changed, 919 insertions(+), 4 deletions(-)
 create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_seq64.c
 create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_seq64.h
 create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c
 create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.h

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2.25.1