[PATCH v12 0/5] drm/amdgpu: Add WAIT_EVENT ioctl for render-node events

This series introduces a render-node WAIT_EVENT ioctl for retrieving
AMDGPU event records and associated metadata.

WAIT_EVENT complements the EVENTFD notification interface. EVENTFD
provides lightweight readiness notification, while WAIT_EVENT allows
userspace to retrieve the corresponding event record and associated
metadata.

This series builds on the previously proposed render-node EVENTFD
infrastructure and adds WAIT_EVENT support together with USERQ_EOP and
QUEUE_RESET event producers.

Changes since v11:
- Use an unsigned absolute CLOCK_MONOTONIC deadline for WAIT_EVENT.
- Preserve zero timeout semantics as an immediate check-and-return.
- Remove the special handling for indefinite waits.
- Improve kerneldoc for timeout handling and WAIT_EVENT manager
  lifetime.
- Clarify the existing teardown ordering that guarantees the embedded
  WAIT_EVENT manager remains valid while USERQ producers are active.
- Address review comments from Christian.

Srinivasan Shanmugam (5):
  drm/amdgpu/uapi: Add WAIT_EVENT ioctl and metadata structures
  drm/amdgpu: Add wait-event manager and per-file lifetime plumbing
  drm/amdgpu: Remove queue-scoped WAIT_EVENT records on queue teardown
  drm/amdgpu: Record USERQ_EOP WAIT_EVENT notifications
  drm/amdgpu: Record QUEUE_RESET WAIT_EVENT notifications

 drivers/gpu/drm/amd/amdgpu/Makefile           |   2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu.h           |   5 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c       |   1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c       |   5 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c     |  35 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_userq.h     |   2 +
 .../gpu/drm/amd/amdgpu/amdgpu_wait_event.c    | 490 ++++++++++++++++++
 .../gpu/drm/amd/amdgpu/amdgpu_wait_event.h    | 101 ++++
 include/uapi/drm/amdgpu_drm.h                 | 114 ++++
 9 files changed, 751 insertions(+), 4 deletions(-)
 create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_wait_event.c
 create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_wait_event.h

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2.34.1