> On Dec 4, 2025, at 4:53 PM, Joel Fernandes <[email protected]> wrote: > > This series combines a number of other series which build up to the same > goal: > to make it possible to use DRM buddy from nova-core rust code. See links to > the > different series below. > > The git tree with all patches can be found at: > git://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git (tag: > clist-buddy-v4-20251204)
FYI - this series is rebased on linux-next to reduce conflicts, but I am happy to rebase on another tree if needed/requested. Thanks, - Joel > > Changes for v4: > - Combined the clist and drm buddy series: > - A rust module (CList) to access circular linked lists from rust code. > - DRM buddy allocator bindings that were originally part of RFC. > - DRM buddy allocator one level up to drivers/gpu/ so it can be used by > GPU drivers (example, nova-core) that have usecases other than DRM. > - Add Rust bindings for the GPU buddy allocator. > > Notes from past cover letters about CList: > > Introduction > ============ > This patchset introduces an interface to iterate over doubly circular linked > lists used in the kernel (allocated by C kernel code). The main usecase is > iterating over the list of blocks provided by the GPU buddy allocator. > > The series also moves the DRM buddy allocator one level up and adds Rust > bindings for it, enabling GPU drivers like nova-core to use it. > > A question may arise: Why not use rust list.rs for this? > ========================================================= > Rust's list.rs is used to provide safe intrusive lists for Rust-allocated > items. In doing so, it takes ownership of the items in the list and the links > between list items. However, the usecase for GPU buddy allocator bindings, the > C side allocates the items in the list, and also links the list together. Due > to this, there is an ownership conflict making list.rs not the best > abstraction > for this usecase. What we need is a view of the list, not ownership of it. > Further, the list links in a bindings usecase may come from C allocated > objects, not from the Rust side. > > Link to v2 (clist only): > https://lore.kernel.org/all/[email protected]/ > > Notes and patches about DRM buddy code movement and DRM buddy bindings: > > Link to RFC: > https://lore.kernel.org/all/[email protected]/ > Link to DRM buddy move discussion: > https://lore.kernel.org/all/[email protected]/ > > Joel Fernandes (3): > rust: clist: Add support to interface with C linked lists > gpu: Move DRM buddy allocator one level up > rust: gpu: Add GPU buddy allocator bindings > > Documentation/gpu/drm-mm.rst | 10 +- > MAINTAINERS | 7 + > drivers/gpu/Kconfig | 13 + > drivers/gpu/Makefile | 2 + > drivers/gpu/buddy.c | 1310 +++++++++++++++++ > drivers/gpu/drm/Kconfig | 1 + > drivers/gpu/drm/Kconfig.debug | 4 +- > drivers/gpu/drm/amd/amdgpu/Kconfig | 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 | 80 +- > drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.h | 20 +- > drivers/gpu/drm/drm_buddy.c | 1287 +--------------- > drivers/gpu/drm/i915/Kconfig | 1 + > 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 | 6 +- > .../drm/i915/selftests/intel_memory_region.c | 20 +- > drivers/gpu/drm/tests/Makefile | 1 - > .../gpu/drm/ttm/tests/ttm_bo_validate_test.c | 5 +- > drivers/gpu/drm/ttm/tests/ttm_mock_manager.c | 18 +- > drivers/gpu/drm/ttm/tests/ttm_mock_manager.h | 4 +- > drivers/gpu/drm/xe/Kconfig | 1 + > 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 | 73 +- > drivers/gpu/drm/xe/xe_ttm_vram_mgr_types.h | 4 +- > drivers/gpu/tests/Makefile | 3 + > .../gpu_buddy_test.c} | 390 ++--- > drivers/gpu/tests/gpu_random.c | 48 + > drivers/gpu/tests/gpu_random.h | 28 + > drivers/video/Kconfig | 2 + > 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 | 12 + > rust/kernel/clist.rs | 357 +++++ > rust/kernel/gpu/buddy.rs | 527 +++++++ > rust/kernel/gpu/mod.rs | 5 + > rust/kernel/lib.rs | 3 + > 42 files changed, 2944 insertions(+), 1800 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} > (68%) > create mode 100644 drivers/gpu/tests/gpu_random.c > create mode 100644 drivers/gpu/tests/gpu_random.h > 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/clist.rs > create mode 100644 rust/kernel/gpu/buddy.rs > create mode 100644 rust/kernel/gpu/mod.rs > > -- > 2.34.1 >
