Re: [PATCH v10 0/8] Preparatory patches for nova-core memory management

[Joel Fernandes <joelagnelf@nvidia.com>]

My CC list missed a lot of folks, sorry about that. Adding more CC's to this
email to make people aware of the posting. Thankfully it got posted to the
archives so for those on rust-for-linux, dri-devel and nouveau lore lists, they
would get it.

Thanks,

--
Joel Fernandes

On 2/18/2026 3:54 PM, Joel Fernandes wrote:
> These are initial preparatory patches needed for nova-core memory management
> support. The series moves the DRM buddy allocator one level up so it can be
> shared across GPU subsystems, adds Rust FFI and clist bindings, and creates
> Rust GPU buddy allocator bindings.
> 
> The clist/ffi patches are ready, reviewed by Gary and Danilo. Miguel, can you
> pull those via the rust tree?
> 
> The non-Rust DRM buddy related patches are already being pulled into upstream
> by Dave Airlie but I have included them here as they are needed for the rest of
> the patches (thanks to Dave for reworking them so they applied).
> 
> I will post the nova-core memory management patches as a separate follow-up
> series just after this one.
> 
> The git tree with all these patches can be found at:
> git://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git (tag: nova/mm)
> 
> Joel Fernandes (7):
>   gpu: Move DRM buddy allocator one level up (part one)
>   gpu: Move DRM buddy allocator one level up (part two)
>   rust: ffi: Convert pub use to pub mod and create ffi module
>   rust: clist: Add support to interface with C linked lists
>   rust: gpu: Add GPU buddy allocator bindings
>   nova-core: mm: Select GPU_BUDDY for VRAM allocation
>   nova-core: Kconfig: Sort select statements alphabetically
> 
> Koen Koning (1):
>   gpu: Fix uninitialized buddy for built-in drivers
> 
>  Documentation/gpu/drm-mm.rst                  |   10 +-
>  MAINTAINERS                                   |   15 +-
>  drivers/gpu/Kconfig                           |   13 +
>  drivers/gpu/Makefile                          |    3 +-
>  drivers/gpu/buddy.c                           | 1322 +++++++++++++++++
>  drivers/gpu/drm/Kconfig                       |    5 +-
>  drivers/gpu/drm/Kconfig.debug                 |    1 -
>  drivers/gpu/drm/Makefile                      |    1 -
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c       |    2 +-
>  .../gpu/drm/amd/amdgpu/amdgpu_res_cursor.h    |   12 +-
>  drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c  |   79 +-
>  drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.h  |   20 +-
>  drivers/gpu/drm/drm_buddy.c                   | 1277 +---------------
>  drivers/gpu/drm/i915/gem/i915_gem_ttm.c       |    2 +-
>  drivers/gpu/drm/i915/i915_scatterlist.c       |   10 +-
>  drivers/gpu/drm/i915/i915_ttm_buddy_manager.c |   55 +-
>  drivers/gpu/drm/i915/i915_ttm_buddy_manager.h |    4 +-
>  .../drm/i915/selftests/intel_memory_region.c  |   20 +-
>  drivers/gpu/drm/tests/Makefile                |    1 -
>  drivers/gpu/drm/tests/drm_exec_test.c         |    2 -
>  drivers/gpu/drm/tests/drm_mm_test.c           |    2 -
>  .../gpu/drm/ttm/tests/ttm_bo_validate_test.c  |    4 +-
>  drivers/gpu/drm/ttm/tests/ttm_mock_manager.c  |   18 +-
>  drivers/gpu/drm/ttm/tests/ttm_mock_manager.h  |    4 +-
>  drivers/gpu/drm/xe/xe_res_cursor.h            |   34 +-
>  drivers/gpu/drm/xe/xe_svm.c                   |   12 +-
>  drivers/gpu/drm/xe/xe_ttm_vram_mgr.c          |   71 +-
>  drivers/gpu/drm/xe/xe_ttm_vram_mgr_types.h    |    4 +-
>  drivers/gpu/nova-core/Kconfig                 |    3 +-
>  drivers/gpu/tests/Makefile                    |    4 +
>  .../gpu_buddy_test.c}                         |  416 +++---
>  .../lib/drm_random.c => tests/gpu_random.c}   |   18 +-
>  .../lib/drm_random.h => tests/gpu_random.h}   |   18 +-
>  drivers/video/Kconfig                         |    1 +
>  include/drm/drm_buddy.h                       |  163 +-
>  include/linux/gpu_buddy.h                     |  177 +++
>  rust/bindings/bindings_helper.h               |   11 +
>  rust/helpers/gpu.c                            |   23 +
>  rust/helpers/helpers.c                        |    2 +
>  rust/helpers/list.c                           |   17 +
>  rust/kernel/ffi/clist.rs                      |  327 ++++
>  rust/kernel/ffi/mod.rs                        |    9 +
>  rust/kernel/gpu/buddy.rs                      |  537 +++++++
>  rust/kernel/gpu/mod.rs                        |    5 +
>  rust/kernel/lib.rs                            |    5 +-
>  45 files changed, 2893 insertions(+), 1846 deletions(-)
>  create mode 100644 drivers/gpu/Kconfig
>  create mode 100644 drivers/gpu/buddy.c
>  create mode 100644 drivers/gpu/tests/Makefile
>  rename drivers/gpu/{drm/tests/drm_buddy_test.c => tests/gpu_buddy_test.c} (67%)
>  rename drivers/gpu/{drm/lib/drm_random.c => tests/gpu_random.c} (59%)
>  rename drivers/gpu/{drm/lib/drm_random.h => tests/gpu_random.h} (53%)
>  create mode 100644 include/linux/gpu_buddy.h
>  create mode 100644 rust/helpers/gpu.c
>  create mode 100644 rust/helpers/list.c
>  create mode 100644 rust/kernel/ffi/clist.rs
>  create mode 100644 rust/kernel/ffi/mod.rs
>  create mode 100644 rust/kernel/gpu/buddy.rs
>  create mode 100644 rust/kernel/gpu/mod.rs
> 
> Cc: Nikola Djukic <ndjukic@nvidia.com>
> base-commit: 2961f841b025fb234860bac26dfb7fa7cb0fb122

-- 
Joel Fernandes