[PATCH drm-next 00/14] [RFC] DRM GPUVA Manager & Nouveau VM_BIND UAPI
Christian König
christian.koenig at amd.com
Wed Jan 18 08:53:10 UTC 2023
Am 18.01.23 um 07:12 schrieb Danilo Krummrich:
> This patch series provides a new UAPI for the Nouveau driver in order to
> support Vulkan features, such as sparse bindings and sparse residency.
>
> Furthermore, with the DRM GPUVA manager it provides a new DRM core feature to
> keep track of GPU virtual address (VA) mappings in a more generic way.
>
> The DRM GPUVA manager is indented to help drivers implement userspace-manageable
> GPU VA spaces in reference to the Vulkan API. In order to achieve this goal it
> serves the following purposes in this context.
>
> 1) Provide a dedicated range allocator to track GPU VA allocations and
> mappings, making use of the drm_mm range allocator.
This means that the ranges are allocated by the kernel? If yes that's a
really really bad idea.
Regards,
Christian.
>
> 2) Generically connect GPU VA mappings to their backing buffers, in
> particular DRM GEM objects.
>
> 3) Provide a common implementation to perform more complex mapping
> operations on the GPU VA space. In particular splitting and merging
> of GPU VA mappings, e.g. for intersecting mapping requests or partial
> unmap requests.
>
> The new VM_BIND Nouveau UAPI build on top of the DRM GPUVA manager, itself
> providing the following new interfaces.
>
> 1) Initialize a GPU VA space via the new DRM_IOCTL_NOUVEAU_VM_INIT ioctl
> for UMDs to specify the portion of VA space managed by the kernel and
> userspace, respectively.
>
> 2) Allocate and free a VA space region as well as bind and unbind memory
> to the GPUs VA space via the new DRM_IOCTL_NOUVEAU_VM_BIND ioctl.
>
> 3) Execute push buffers with the new DRM_IOCTL_NOUVEAU_EXEC ioctl.
>
> Both, DRM_IOCTL_NOUVEAU_VM_BIND and DRM_IOCTL_NOUVEAU_EXEC, make use of the DRM
> scheduler to queue jobs and support asynchronous processing with DRM syncobjs
> as synchronization mechanism.
>
> By default DRM_IOCTL_NOUVEAU_VM_BIND does synchronous processing,
> DRM_IOCTL_NOUVEAU_EXEC supports asynchronous processing only.
>
> The new VM_BIND UAPI for Nouveau makes also use of drm_exec (execution context
> for GEM buffers) by Christian König. Since the patch implementing drm_exec was
> not yet merged into drm-next it is part of this series, as well as a small fix
> for this patch, which was found while testing this series.
>
> This patch series is also available at [1].
>
> There is a Mesa NVK merge request by Dave Airlie [2] implementing the
> corresponding userspace parts for this series.
>
> The Vulkan CTS test suite passes the sparse binding and sparse residency test
> cases for the new UAPI together with Dave's Mesa work.
>
> There are also some test cases in the igt-gpu-tools project [3] for the new UAPI
> and hence the DRM GPU VA manager. However, most of them are testing the DRM GPU
> VA manager's logic through Nouveau's new UAPI and should be considered just as
> helper for implementation.
>
> However, I absolutely intend to change those test cases to proper kunit test
> cases for the DRM GPUVA manager, once and if we agree on it's usefulness and
> design.
>
> [1] https://gitlab.freedesktop.org/nouvelles/kernel/-/tree/new-uapi-drm-next /
> https://gitlab.freedesktop.org/nouvelles/kernel/-/merge_requests/1
> [2] https://gitlab.freedesktop.org/nouveau/mesa/-/merge_requests/150/
> [3] https://gitlab.freedesktop.org/dakr/igt-gpu-tools/-/tree/wip_nouveau_vm_bind
>
> I also want to give credit to Dave Airlie, who contributed a lot of ideas to
> this patch series.
>
> Christian König (1):
> drm: execution context for GEM buffers
>
> Danilo Krummrich (13):
> drm/exec: fix memory leak in drm_exec_prepare_obj()
> drm: manager to keep track of GPUs VA mappings
> drm: debugfs: provide infrastructure to dump a DRM GPU VA space
> drm/nouveau: new VM_BIND uapi interfaces
> drm/nouveau: get vmm via nouveau_cli_vmm()
> drm/nouveau: bo: initialize GEM GPU VA interface
> drm/nouveau: move usercopy helpers to nouveau_drv.h
> drm/nouveau: fence: fail to emit when fence context is killed
> drm/nouveau: chan: provide nouveau_channel_kill()
> drm/nouveau: nvkm/vmm: implement raw ops to manage uvmm
> drm/nouveau: implement uvmm for user mode bindings
> drm/nouveau: implement new VM_BIND UAPI
> drm/nouveau: debugfs: implement DRM GPU VA debugfs
>
> Documentation/gpu/driver-uapi.rst | 11 +
> Documentation/gpu/drm-mm.rst | 43 +
> drivers/gpu/drm/Kconfig | 6 +
> drivers/gpu/drm/Makefile | 3 +
> drivers/gpu/drm/amd/amdgpu/Kconfig | 1 +
> drivers/gpu/drm/drm_debugfs.c | 56 +
> drivers/gpu/drm/drm_exec.c | 294 ++++
> drivers/gpu/drm/drm_gem.c | 3 +
> drivers/gpu/drm/drm_gpuva_mgr.c | 1323 +++++++++++++++++
> drivers/gpu/drm/nouveau/Kbuild | 3 +
> drivers/gpu/drm/nouveau/Kconfig | 2 +
> drivers/gpu/drm/nouveau/include/nvif/if000c.h | 23 +-
> drivers/gpu/drm/nouveau/include/nvif/vmm.h | 17 +-
> .../gpu/drm/nouveau/include/nvkm/subdev/mmu.h | 10 +
> drivers/gpu/drm/nouveau/nouveau_abi16.c | 23 +
> drivers/gpu/drm/nouveau/nouveau_abi16.h | 1 +
> drivers/gpu/drm/nouveau/nouveau_bo.c | 152 +-
> drivers/gpu/drm/nouveau/nouveau_bo.h | 2 +-
> drivers/gpu/drm/nouveau/nouveau_chan.c | 16 +-
> drivers/gpu/drm/nouveau/nouveau_chan.h | 1 +
> drivers/gpu/drm/nouveau/nouveau_debugfs.c | 24 +
> drivers/gpu/drm/nouveau/nouveau_drm.c | 25 +-
> drivers/gpu/drm/nouveau/nouveau_drv.h | 92 +-
> drivers/gpu/drm/nouveau/nouveau_exec.c | 310 ++++
> drivers/gpu/drm/nouveau/nouveau_exec.h | 55 +
> drivers/gpu/drm/nouveau/nouveau_fence.c | 7 +
> drivers/gpu/drm/nouveau/nouveau_fence.h | 2 +-
> drivers/gpu/drm/nouveau/nouveau_gem.c | 83 +-
> drivers/gpu/drm/nouveau/nouveau_mem.h | 5 +
> drivers/gpu/drm/nouveau/nouveau_prime.c | 2 +-
> drivers/gpu/drm/nouveau/nouveau_sched.c | 780 ++++++++++
> drivers/gpu/drm/nouveau/nouveau_sched.h | 98 ++
> drivers/gpu/drm/nouveau/nouveau_svm.c | 2 +-
> drivers/gpu/drm/nouveau/nouveau_uvmm.c | 575 +++++++
> drivers/gpu/drm/nouveau/nouveau_uvmm.h | 68 +
> drivers/gpu/drm/nouveau/nouveau_vmm.c | 4 +-
> drivers/gpu/drm/nouveau/nvif/vmm.c | 73 +-
> .../gpu/drm/nouveau/nvkm/subdev/mmu/uvmm.c | 168 ++-
> .../gpu/drm/nouveau/nvkm/subdev/mmu/uvmm.h | 1 +
> drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmm.c | 32 +-
> drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmm.h | 3 +
> include/drm/drm_debugfs.h | 25 +
> include/drm/drm_drv.h | 6 +
> include/drm/drm_exec.h | 144 ++
> include/drm/drm_gem.h | 75 +
> include/drm/drm_gpuva_mgr.h | 527 +++++++
> include/uapi/drm/nouveau_drm.h | 216 +++
> 47 files changed, 5266 insertions(+), 126 deletions(-)
> create mode 100644 drivers/gpu/drm/drm_exec.c
> create mode 100644 drivers/gpu/drm/drm_gpuva_mgr.c
> create mode 100644 drivers/gpu/drm/nouveau/nouveau_exec.c
> create mode 100644 drivers/gpu/drm/nouveau/nouveau_exec.h
> create mode 100644 drivers/gpu/drm/nouveau/nouveau_sched.c
> create mode 100644 drivers/gpu/drm/nouveau/nouveau_sched.h
> create mode 100644 drivers/gpu/drm/nouveau/nouveau_uvmm.c
> create mode 100644 drivers/gpu/drm/nouveau/nouveau_uvmm.h
> create mode 100644 include/drm/drm_exec.h
> create mode 100644 include/drm/drm_gpuva_mgr.h
>
>
> base-commit: 0b45ac1170ea6416bc1d36798414c04870cd356d
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