[PATCH v8 00/25] gpu: nova-core: Add memory management support

[Joel Fernandes <joelagnelf@nvidia.com>]

This series adds support for nova-core memory management, including VRAM
allocation, PRAMIN, VMM, page table walking, and BAR 1 read/writes.
These are critical for channel management, vGPU, and all other memory
management uses of nova-core.

Changes from v7 to v8:
- Incorporated "Select GPU_BUDDY for VRAM allocation" patch from the
  dependency series (Alex).
- Significant patch reordering for better logical flow (GSP/FB patches
  moved earlier, page table patches, Vmm, Bar1, tests) (Alex).
- Replaced several 'as' usages with into_safe_cast() (Danilo, Alex).
- Updated BAR 1 test cases to include exercising the block size API (Eliot, Danilo).

Changes from v6 to v7:
- Addressed DMA fence signalling usecase per Danilo's feedback.

Pre v6:
- Simplified PRAMIN code (John Hubbard, Alex Courbot).
- Handled different MMU versions: ver2 versus ver3 (John Hubbard).
- Added BAR1 usecase so we have user of DRM Buddy / VMM (John Hubbard).
- Iterating over clist/buddy bindings.

All patches, along with all the dependencies (including CList), can be
found at:
https://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git (branch nova/mm)

Link to v7: https://lore.kernel.org/all/20260218212020.800836-1-joelagnelf@nvidia.com/

Joel Fernandes (25):
  gpu: nova-core: Select GPU_BUDDY for VRAM allocation
  gpu: nova-core: Kconfig: Sort select statements alphabetically
  gpu: nova-core: gsp: Return GspStaticInfo and FbLayout from boot()
  gpu: nova-core: gsp: Extract usable FB region from GSP
  gpu: nova-core: fb: Add usable_vram field to FbLayout
  gpu: nova-core: mm: Add support to use PRAMIN windows to write to VRAM
  docs: gpu: nova-core: Document the PRAMIN aperture mechanism
  gpu: nova-core: mm: Add common memory management types
  gpu: nova-core: mm: Add TLB flush support
  gpu: nova-core: mm: Add GpuMm centralized memory manager
  gpu: nova-core: mm: Use usable VRAM region for buddy allocator
  gpu: nova-core: mm: Add common types for all page table formats
  gpu: nova-core: mm: Add MMU v2 page table types
  gpu: nova-core: mm: Add MMU v3 page table types
  gpu: nova-core: mm: Add unified page table entry wrapper enums
  gpu: nova-core: mm: Add page table walker for MMU v2/v3
  gpu: nova-core: mm: Add Virtual Memory Manager
  gpu: nova-core: mm: Add virtual address range tracking to VMM
  gpu: nova-core: mm: Add multi-page mapping API to VMM
  gpu: nova-core: Add BAR1 aperture type and size constant
  gpu: nova-core: gsp: Add BAR1 PDE base accessors
  gpu: nova-core: mm: Add BAR1 user interface
  gpu: nova-core: mm: Add BarUser to struct Gpu and create at boot
  gpu: nova-core: mm: Add BAR1 memory management self-tests
  gpu: nova-core: mm: Add PRAMIN aperture self-tests

 Documentation/gpu/nova/core/pramin.rst     | 125 ++++++
 Documentation/gpu/nova/index.rst           |   1 +
 drivers/gpu/nova-core/Kconfig              |  13 +-
 drivers/gpu/nova-core/driver.rs            |   9 +-
 drivers/gpu/nova-core/fb.rs                |  26 +-
 drivers/gpu/nova-core/gpu.rs               | 130 +++++-
 drivers/gpu/nova-core/gsp/boot.rs          |  22 +-
 drivers/gpu/nova-core/gsp/commands.rs      |  18 +-
 drivers/gpu/nova-core/gsp/fw/commands.rs   |  40 ++
 drivers/gpu/nova-core/mm.rs                | 245 ++++++++++
 drivers/gpu/nova-core/mm/bar_user.rs       | 406 +++++++++++++++++
 drivers/gpu/nova-core/mm/pagetable.rs      | 453 +++++++++++++++++++
 drivers/gpu/nova-core/mm/pagetable/ver2.rs | 199 +++++++++
 drivers/gpu/nova-core/mm/pagetable/ver3.rs | 302 +++++++++++++
 drivers/gpu/nova-core/mm/pagetable/walk.rs | 218 +++++++++
 drivers/gpu/nova-core/mm/pramin.rs         | 453 +++++++++++++++++++
 drivers/gpu/nova-core/mm/tlb.rs            |  90 ++++
 drivers/gpu/nova-core/mm/vmm.rs            | 494 +++++++++++++++++++++
 drivers/gpu/nova-core/nova_core.rs         |   1 +
 drivers/gpu/nova-core/regs.rs              |  38 ++
 20 files changed, 3273 insertions(+), 10 deletions(-)
 create mode 100644 Documentation/gpu/nova/core/pramin.rst
 create mode 100644 drivers/gpu/nova-core/mm.rs
 create mode 100644 drivers/gpu/nova-core/mm/bar_user.rs
 create mode 100644 drivers/gpu/nova-core/mm/pagetable.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


base-commit: 2961f841b025fb234860bac26dfb7fa7cb0fb122
prerequisite-patch-id: f8778e0b72697243cfe40a8bfcc3ca1d66160b12
prerequisite-patch-id: 763b30c69f9806de97eb58bc8e3406feb6bf61b4
prerequisite-patch-id: 2cded1a588520cf7d08f51bf5b3646d5b3dc26bd
prerequisite-patch-id: 4933d6b86caab3e4630c92292cfe8e9d3b8f3524
prerequisite-patch-id: 9f58738611f42a330b00bd976fbcafe2b7e6d75e
prerequisite-patch-id: 07f81850399af27b61dcba81ad1bb24bcf977ac1
-- 
2.34.1