[RFC,00/10] drm/i915/vm_bind: Add VM_BIND functionality

Message

Niranjana Vishwanathapura July 1, 2022, 10:50 p.m. UTC

DRM_I915_GEM_VM_BIND/UNBIND ioctls allows UMD to bind/unbind GEM
buffer objects (BOs) or sections of a BOs at specified GPU virtual
addresses on a specified address space (VM). Multiple mappings can map
to the same physical pages of an object (aliasing). These mappings (also
referred to as persistent mappings) will be persistent across multiple
GPU submissions (execbuf calls) issued by the UMD, without user having
to provide a list of all required mappings during each submission (as
required by older execbuf mode).

This patch series support VM_BIND version 1, as described by the param
I915_PARAM_VM_BIND_VERSION.

Add new execbuf3 ioctl (I915_GEM_EXECBUFFER3) which only works in
vm_bind mode. The vm_bind mode only works with this new execbuf3 ioctl.
The new execbuf3 ioctl will not have any execlist support and all the
legacy support like relocations etc., are removed.

TODOs:
* Support out fence for VM_UNBIND ioctl.
* Async VM_UNBIND support.
* Share code between execbuf2 and execbuf3 where possible.
* Cleanups and optimizations.

NOTEs:
* It is based on below VM_BIND design+uapi patch series.
  https://lists.freedesktop.org/archives/intel-gfx/2022-July/300760.html

* The IGT RFC series is posted as,
  [RFC 0/5] vm_bind: Add VM_BIND validation support

Signed-off-by: Niranjana Vishwanathapura <[e-mail]>

Niranjana Vishwanathapura (10):
  drm/i915/vm_bind: Introduce VM_BIND ioctl
  drm/i915/vm_bind: Bind and unbind mappings
  drm/i915/vm_bind: Support private and shared BOs
  drm/i915/vm_bind: Add out fence support
  drm/i915/vm_bind: Handle persistent vmas
  drm/i915/vm_bind: Add I915_GEM_EXECBUFFER3 ioctl
  drm/i915/vm_bind: Handle persistent vmas in execbuf3
  drm/i915/vm_bind: userptr dma-resv changes
  drm/i915/vm_bind: Skip vma_lookup for persistent vmas
  drm/i915/vm_bind: Fix vm->vm_bind_mutex and vm->mutex nesting

 drivers/gpu/drm/i915/Makefile                 |    2 +
 drivers/gpu/drm/i915/gem/i915_gem_context.c   |   20 +-
 drivers/gpu/drm/i915/gem/i915_gem_context.h   |   15 +
 drivers/gpu/drm/i915/gem/i915_gem_create.c    |   51 +-
 drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c    |    6 +
 .../gpu/drm/i915/gem/i915_gem_execbuffer.c    |    5 +
 .../gpu/drm/i915/gem/i915_gem_execbuffer3.c   | 1270 +++++++++++++++++
 drivers/gpu/drm/i915/gem/i915_gem_ioctls.h    |    2 +
 drivers/gpu/drm/i915/gem/i915_gem_object.c    |    1 +
 drivers/gpu/drm/i915/gem/i915_gem_object.h    |    2 +
 .../gpu/drm/i915/gem/i915_gem_object_types.h  |    3 +
 drivers/gpu/drm/i915/gem/i915_gem_ttm.c       |    3 +
 drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h   |   54 +
 .../drm/i915/gem/i915_gem_vm_bind_object.c    |  342 +++++
 drivers/gpu/drm/i915/gt/intel_gtt.c           |   37 +-
 drivers/gpu/drm/i915/gt/intel_gtt.h           |   20 +
 drivers/gpu/drm/i915/i915_driver.c            |   38 +
 drivers/gpu/drm/i915/i915_gem_gtt.h           |   22 +
 drivers/gpu/drm/i915/i915_getparam.c          |    3 +
 drivers/gpu/drm/i915/i915_vma.c               |   59 +-
 drivers/gpu/drm/i915/i915_vma.h               |   80 +-
 drivers/gpu/drm/i915/i915_vma_types.h         |   40 +
 include/uapi/drm/i915_drm.h                   |  289 +++-
 23 files changed, 2316 insertions(+), 48 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/gem/i915_gem_execbuffer3.c
 create mode 100644 drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h
 create mode 100644 drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c