[PATCH RFC v6 00/26] nova-core: Memory management infrastructure (v6)

[Joel Fernandes <joelagnelf@nvidia.com>]

This series is rebased on drm-rust-kernel/drm-rust-next and provides memory
management infrastructure for the nova-core GPU driver. It combines several
previous series and provides a foundation for nova GPU memory management
including page tables, virtual memory management, and BAR mapping. All these
are critical nova-core features.

The series includes:
- A Rust module (CList) to interface with C circular linked lists, required
  for iterating over buddy allocator blocks.
- Movement of the DRM buddy allocator up to drivers/gpu/ level, renamed to GPU buddy.
- Rust bindings for the GPU buddy allocator.
- PRAMIN aperture support for direct VRAM access.
- Page table types for MMU v2 and v3 formats.
- Virtual Memory Manager (VMM) for GPU virtual address space management.
- BAR1 user interface for mapping access GPU via virtual memory.
- Selftests for PRAMIN and BAR1 user interface (disabled by default).

Changes from v5 to v6:
- Rebased on drm-rust-kernel/drm-rust-next
- Added page table types and page table walker infrastructure
- Added Virtual Memory Manager (VMM)
- Added BAR1 user interface
- Added TLB flush support
- Added GpuMm memory manager
- Extended to 26 patches from 6 (full mm infrastructure now included)

The git tree with all patches can be found at:
git://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git (tag: nova-mm-v6-20260120)

Link to v5: https://lore.kernel.org/all/20251219203805.1246586-1-joelagnelf@nvidia.com/

Previous series that are combined:
- v4 (clist + buddy): https://lore.kernel.org/all/20251204215129.2357292-1-joelagnelf@nvidia.com/
- v3 (clist only): https://lore.kernel.org/all/20251129213056.4021375-1-joelagnelf@nvidia.com/
- v2 (clist only): https://lore.kernel.org/all/20251111171315.2196103-4-joelagnelf@nvidia.com/
- clist RFC (original with buddy): https://lore.kernel.org/all/20251030190613.1224287-1-joelagnelf@nvidia.com/
- DRM buddy move: https://lore.kernel.org/all/20251124234432.1988476-1-joelagnelf@nvidia.com/
- PRAMIN series: https://lore.kernel.org/all/20251020185539.49986-1-joelagnelf@nvidia.com/

Joel Fernandes (26):
  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
  nova-core: mm: Select GPU_BUDDY for VRAM allocation
  nova-core: mm: Add support to use PRAMIN windows to write to VRAM
  docs: gpu: nova-core: Document the PRAMIN aperture mechanism
  nova-core: Add BAR1 aperture type and size constant
  nova-core: gsp: Add BAR1 PDE base accessors
  nova-core: mm: Add common memory management types
  nova-core: mm: Add common types for all page table formats
  nova-core: mm: Add MMU v2 page table types
  nova-core: mm: Add MMU v3 page table types
  nova-core: mm: Add unified page table entry wrapper enums
  nova-core: mm: Add TLB flush support
  nova-core: mm: Add GpuMm centralized memory manager
  nova-core: mm: Add page table walker for MMU v2
  nova-core: mm: Add Virtual Memory Manager
  nova-core: mm: Add virtual address range tracking to VMM
  nova-core: mm: Add BAR1 user interface
  nova-core: gsp: Return GspStaticInfo and FbLayout from boot()
  nova-core: mm: Add memory management self-tests
  nova-core: mm: Add PRAMIN aperture self-tests
  nova-core: gsp: Extract usable FB region from GSP
  nova-core: fb: Add usable_vram field to FbLayout
  nova-core: mm: Use usable VRAM region for buddy allocator
  nova-core: mm: Add BarUser to struct Gpu and create at boot

 Documentation/gpu/drm-mm.rst                  |   10 +-
 Documentation/gpu/nova/core/pramin.rst        |  125 ++
 Documentation/gpu/nova/index.rst              |    1 +
 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                   | 1284 +---------------
 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/nova-core/Kconfig                 |   22 +
 drivers/gpu/nova-core/driver.rs               |    9 +-
 drivers/gpu/nova-core/fb.rs                   |   23 +-
 drivers/gpu/nova-core/gpu.rs                  |  140 +-
 drivers/gpu/nova-core/gsp/boot.rs             |   22 +-
 drivers/gpu/nova-core/gsp/commands.rs         |   18 +-
 drivers/gpu/nova-core/gsp/fw/commands.rs      |   38 +
 drivers/gpu/nova-core/mm/bar_user.rs          |  336 +++++
 drivers/gpu/nova-core/mm/mod.rs               |  209 +++
 drivers/gpu/nova-core/mm/pagetable/mod.rs     |  377 +++++
 drivers/gpu/nova-core/mm/pagetable/ver2.rs    |  184 +++
 drivers/gpu/nova-core/mm/pagetable/ver3.rs    |  286 ++++
 drivers/gpu/nova-core/mm/pagetable/walk.rs    |  285 ++++
 drivers/gpu/nova-core/mm/pramin.rs            |  404 +++++
 drivers/gpu/nova-core/mm/tlb.rs               |   79 +
 drivers/gpu/nova-core/mm/vmm.rs               |  247 ++++
 drivers/gpu/nova-core/nova_core.rs            |    1 +
 drivers/gpu/nova-core/regs.rs                 |   38 +
 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                      |  538 +++++++
 rust/kernel/gpu/mod.rs                        |    5 +
 rust/kernel/lib.rs                            |    3 +
 62 files changed, 5788 insertions(+), 1808 deletions(-)
 create mode 100644 Documentation/gpu/nova/core/pramin.rst
 create mode 100644 drivers/gpu/Kconfig
 create mode 100644 drivers/gpu/buddy.c
 create mode 100644 drivers/gpu/nova-core/mm/bar_user.rs
 create mode 100644 drivers/gpu/nova-core/mm/mod.rs
 create mode 100644 drivers/gpu/nova-core/mm/pagetable/mod.rs
 create mode 100644 drivers/gpu/nova-core/mm/pagetable/ver2.rs
 create mode 100644 drivers/gpu/nova-core/mm/pagetable/ver3.rs
 create mode 100644 drivers/gpu/nova-core/mm/pagetable/walk.rs
 create mode 100644 drivers/gpu/nova-core/mm/pramin.rs
 create mode 100644 drivers/gpu/nova-core/mm/tlb.rs
 create mode 100644 drivers/gpu/nova-core/mm/vmm.rs
 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


base-commit: 6ea52b6d8f33ae627f4dcf43b12b6e713a8b9331
-- 
2.34.1