[PATCH v9 00/23] gpu: nova-core: Add memory management support

Joel Fernandes
2026-03-11T08:09:37Z

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.

It is based on linux -next and all patches, along with all the dependencies
(such as buddy bindings, CList), can be found at:
git://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git (tag: nova-mm-v9-20260310)

Change log:

Changes from v8 to v9:
- Added fixes from Zhi Wang for bitfield position changes in virtual address
and larger BAR1 size on some platforms. Tested and working for vGPU usecase!
- Refactored gsp: boot() to return only GspStaticInfo, removing FbLayout (Alex)
- bar1_pde_base and bar2_pde_base are now accessed via GspStaticInfo directly (Alex)
- Added new patch "gsp: Expose total physical VRAM end from FB region info"
introducing total_fb_end() to expose VRAM extent. (Alex)
- Consolidated usable VRAM and BarUser setup; removed dedicated
"fb: Add usable_vram field to FbLayout", "mm: Use usable VRAM region for
buddy allocator", and "mm: Add BarUser to struct Gpu and create at boot".

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.

Link to v8: https://lore.kernel.org/all/20260224225323.3312204-1-joelagnelf@nvidia.com/
Link to v7: https://lore.kernel.org/all/20260218212020.800836-1-joelagnelf@nvidia.com/

Joel Fernandes (24):
gpu: nova-core: Select GPU_BUDDY for VRAM allocation
gpu: nova-core: Kconfig: Sort select statements alphabetically
gpu: nova-core: gsp: Return GspStaticInfo from boot()
gpu: nova-core: gsp: Extract usable FB region from GSP
gpu: nova-core: gsp: Expose total physical VRAM end from FB region
info
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: 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: mm: Add BAR1 user interface
gpu: nova-core: mm: Add BAR1 memory management self-tests
gpu: nova-core: mm: Add PRAMIN aperture self-tests

Zhi Wang (1):
gpu: nova-core: Use runtime BAR1 size instead of hardcoded 256MB

Documentation/gpu/nova/core/pramin.rst | 125 +++++
Documentation/gpu/nova/index.rst | 1 +
MAINTAINERS | 14 +-
drivers/gpu/nova-core/Kconfig | 13 +-
drivers/gpu/nova-core/driver.rs | 3 +
drivers/gpu/nova-core/gpu.rs | 90 ++-
drivers/gpu/nova-core/gsp/boot.rs | 12 +-
drivers/gpu/nova-core/gsp/commands.rs | 18 +-
drivers/gpu/nova-core/gsp/fw/commands.rs | 59 ++
drivers/gpu/nova-core/mm.rs | 235 ++++++++
drivers/gpu/nova-core/mm/bar_user.rs | 412 ++++++++++++++
drivers/gpu/nova-core/mm/pagetable.rs | 481 ++++++++++++++++
drivers/gpu/nova-core/mm/pagetable/ver2.rs | 232 ++++++++
drivers/gpu/nova-core/mm/pagetable/ver3.rs | 337 ++++++++++++
drivers/gpu/nova-core/mm/pagetable/walk.rs | 218 ++++++++
drivers/gpu/nova-core/mm/pramin.rs | 502 +++++++++++++++++
drivers/gpu/nova-core/mm/tlb.rs | 90 +++
drivers/gpu/nova-core/mm/vmm.rs | 498 +++++++++++++++++
drivers/gpu/nova-core/nova_core.rs | 1 +
drivers/gpu/nova-core/regs.rs | 39 ++
29 files changed, 4390 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

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2.34.1