[PATCH v6 0/5] Rust GPUVM immediate mode

[Alice Ryhl <aliceryhl@google.com>]

This series provides an immediate mode GPUVM implementation.

Only immediate mode is provided for Rust code, as all planned Rust
drivers intend to use GPUVM in immediate mode.

Signed-off-by: Alice Ryhl <aliceryhl@google.com>
---
Changes in v6:
- Rebase on drm-rust-next-2026-04-06. As a result, the dma-resv helpers
  patch is dropped because it was already merged into drm-rust-next.
- Fix Send/Sync impls for GpuVm<T> to take T:Send into account.
- Fix Send/Sync impls and data()/data_ref() methods on UniqueRefGpuVm to
  take T:Send and T:Shync into account.
- Pass __GFP_ZERO to kbox, so that data is zeroed when calling drm_gpuvm_init.
- Call drm_gpuvm_bo_extobj_add() in obtain() even if it returns an
  existing pointer to avoid race condition.
- Check that vm_bo is from the correct GpuVm in sm_map().
- Change sm_map() to take &GpuVmBo instead of ARef<GpuVmBo>.
- Document that sparse VAs are not yet supported.
- Link to v5: https://lore.kernel.org/r/20260320-gpuvm-rust-v5-0-76fd44f17a87@google.com

Changes in v5:
- Rename GpuVmCore to UniqueRefGpuVm.
- Implement Send/Sync for GpuVm.
- Move helpers/dma-resv.c in MAINTAINERS
- Improve GpuVmBo allocation and free docs
- Add "in GEM list" invariant to GpuVmBo
    - also mention said invariant on GpuVa
- Replace GpuVmBoRegistered with ARef<GpuVmBo>
- Add TODO about dma-resv lock usage
- Add __rust_helper to helpers/drm_gpuvm.c
- Change _invariant type to silence type complexity clippy lint
- Link to v4: https://lore.kernel.org/r/20260130-gpuvm-rust-v4-0-8364d104ff40@google.com

Changes in v4:
- Add trait bound so that DriverGpuVm::Object must be the same type as
  Driver::Object.
- Add rust/helpers/dma-resv.c to MAINTAINERS.
- Add __rust_helper to dma_resv_lock and dma_resv_unlock.
- Rename GpuVm::raw_resv_lock() to GpuVm::raw_resv()
- Reword comment in obtain() for adding to extobj list.
- Fix typo in commit message referring to GpuVm<_> instead of GpuVmBo<_>.
- Changed the PhantomData type used for invariance and add comment. (No
  functional change.)
- Rename offset to gem_offset in args to sm_map().
- Link to v3: https://lore.kernel.org/r/20260121-gpuvm-rust-v3-0-dd95c04aec35@google.com

Changes in v3:
- C prerequisites have landed, so only Rust part is present.
- The logic for drm_exec was removed, and is for a follow-up.
- Split up into patches.
- Add lifetime to SmStepContext.
- Docs filled out.
- Mutex abstractions used for GEM gpuva lock.
- Drop 'shared data' concept for now. (Can be added back later if required.)
- Rename 'core' field to 'data'.
- GpuVmCore<T> now derefs to GpuVm<T> instead of T.
- Renamed GpuVmBoObtain to GpuVmBoResident.
- Probably more changes I forgot.
- Link to v2: https://lore.kernel.org/r/20260108-gpuvm-rust-v2-0-dbd014005a0b@google.com

Changes in v2:
- For this version, only the C prerequisites are included. Rust will be
  sent as follow-up.
- Add comment to drm_gpuvm_bo_destroy_not_in_lists()
- Add Fixes: tag.
- Pick up Reviewed-by tags.
- Link to v1: https://lore.kernel.org/r/20251128-gpuvm-rust-v1-0-ebf66bf234e0@google.com

---
Alice Ryhl (4):
      rust: gpuvm: add GpuVm::obtain()
      rust: gpuvm: add GpuVa struct
      rust: gpuvm: add GpuVmCore::sm_unmap()
      rust: gpuvm: add GpuVmCore::sm_map()

Asahi Lina (1):
      rust: drm: add base GPUVM immediate mode abstraction

 MAINTAINERS                     |   2 +
 rust/bindings/bindings_helper.h |   1 +
 rust/helpers/drm_gpuvm.c        |  26 +++
 rust/helpers/helpers.c          |   1 +
 rust/kernel/drm/gpuvm/mod.rs    | 328 ++++++++++++++++++++++++++++++
 rust/kernel/drm/gpuvm/sm_ops.rs | 429 ++++++++++++++++++++++++++++++++++++++++
 rust/kernel/drm/gpuvm/va.rs     | 168 ++++++++++++++++
 rust/kernel/drm/gpuvm/vm_bo.rs  | 249 +++++++++++++++++++++++
 rust/kernel/drm/mod.rs          |   1 +
 9 files changed, 1205 insertions(+)
---
base-commit: a7a080bb4236ebe577b6776d940d1717912ff6dd
change-id: 20251128-gpuvm-rust-b719cac27ad6

Best regards,
-- 
Alice Ryhl <aliceryhl@google.com>