[GIT PULL] DRM Rust changes for v7.1-rc1
From: Danilo Krummrich
Date: Mon Mar 30 2026 - 18:37:27 EST
Hi Dave and Sima,
Please pull these DRM Rust changes.
There's quite a lot of stuff in here this time. The highlights are GPU buddy
and GEM shmem abstractions on the DRM core side; RPC continuation records, the
missing Turing pieces, exposed GSP log buffers in debugfs, and lots of general
refactorings and improvements on the nova-core side.
Among the latter I want to highlight the generic kernel register!() macro and
the DMA improvements.
There are also quite a few external dependencies in here. Besides a few Rust
core and minor workqueue changes, I took all the DMA changes through this tree
for this cycle and merged a shared signed tag from the driver-core tree for
register!() and other I/O improvements.
(I plan to send an early driver-core PR to Linus for this cycle, since I also
gave out two other signed tags for other trees.)
All changes have been in linux-next for at least one round -- no conflicts
expected.
- Danilo
The following changes since commit f338e77383789c0cae23ca3d48adcc5e9e137e3c:
Linux 7.0-rc4 (2026-03-15 13:52:05 -0700)
are available in the Git repository at:
https://gitlab.freedesktop.org/drm/rust/kernel.git tags/drm-rust-next-2026-03-30
for you to fetch changes up to 7c50d748b4a635bc39802ea3f6b120e66b1b9067:
gpu: nova-core: firmware: factor out an elf_str() function (2026-03-30 14:01:53 +0900)
----------------------------------------------------------------
DRM Rust changes for v7.1-rc1
- DMA:
- Rework the DMA coherent API: introduce Coherent<T> as a generalized
container for arbitrary types, replacing the slice-only
CoherentAllocation<T>. Add CoherentBox for memory initialization
before exposing a buffer to hardware (converting to Coherent when
ready), and CoherentHandle for allocations without kernel mapping.
- Add Coherent::init() / init_with_attrs() for one-shot initialization
via pin-init, and from-slice constructors for both Coherent and
CoherentBox
- Add uaccess write_dma() for copying from DMA buffers to userspace
and BinaryWriter support for Coherent<T>
- DRM:
- Add GPU buddy allocator abstraction
- Add DRM shmem GEM helper abstraction
- Allow drm::Device to dispatch work and delayed work items to driver
private data
- Add impl_aref_for_gem_obj!() macro to reduce GEM refcount
boilerplate, and introduce DriverObject::Args for constructor
context
- Add dma_resv_lock helper and raw_dma_resv() accessor on GEM objects
- Clean up imports across the DRM module
- I/O:
- Merged via a signed tag from the driver-core tree: register!() macro
and I/O infrastructure improvements (IoCapable refactor, RelaxedMmio
wrapper, IoLoc trait, generic accessors, write_reg /
LocatedRegister)
- Nova (Core):
- Fix and harden the GSP command queue: correct write pointer
advancing, empty slot handling, and ring buffer indexing; add mutex
locking and make Cmdq a pinned type; distinguish wait vs no-wait
commands
- Add support for large RPCs via continuation records, splitting
oversized commands across multiple queue slots
- Simplify GSP sequencer and message handling code: remove unused
trait and Display impls, derive Debug and Zeroable where applicable,
warn on unconsumed message data
- Refactor Falcon firmware handling: create DMA objects lazily, add
PIO upload support, and use the Generic Bootloader to boot FWSEC on
Turing
- Convert all register definitions (PMC, PBUS, PFB, GC6, FUSE, PDISP,
Falcon) to the kernel register!() macro; add bounded_enum macro to
define enums usable as register fields
- Migrate all DMA usage to the new Coherent, CoherentBox, and
CoherentHandle APIs
- Harden firmware parsing with checked arithmetic throughout FWSEC,
Booter, RISC-V parsing paths
- Add debugfs support for reading GSP-RM log buffers; replace
module_pci_driver!() with explicit module init to support
module-level debugfs setup
- Fix auxiliary device registration for multi-GPU systems
- Various cleanups: import style, firmware parsing refactoring,
framebuffer size logging
- Rust:
- Add interop::list module providing a C linked list interface
- Extend num::Bounded with shift operations, into_bool(), and const
get() to support register bitfield manipulation
- Enable the generic_arg_infer Rust feature and add EMSGSIZE error
code
- Tyr:
- Adopt vertical import style per kernel Rust guidelines
- Clarify driver/device type names and use DRM device type alias
consistently across the driver
- Fix GPU model/version decoding in GpuInfo
- Workqueue:
- Add ARef<T> support for work and delayed work
----------------------------------------------------------------
Alexandre Courbot (50):
gpu: nova-core: gsp: warn if data remains after processing a message
gpu: nova-core: gsp: remove unnecessary Display impls
gpu: nova-core: gsp: simplify sequencer opcode parsing
gpu: nova-core: gsp: remove unneeded sequencer trait
gpu: nova-core: gsp: derive `Debug` on more sequencer types
gpu: nova-core: gsp: derive Zeroable for GspStaticConfigInfo
gpu: nova-core: use core library's CStr instead of kernel one
gpu: nova-core: create falcon firmware DMA objects lazily
gpu: nova-core: falcon: add constant for memory block alignment
gpu: nova-core: falcon: rename load parameters to reflect DMA dependency
gpu: nova-core: falcon: remove FalconFirmware's dependency on FalconDmaLoadable
gpu: nova-core: move brom_params and boot_addr to FalconFirmware
gpu: nova-core: falcon: remove unwarranted safety check in dma_load
gpu: nova-core: make Chipset::arch() const
gpu: nova-core: add gen_bootloader firmware to ModInfoBuilder
gpu: nova-core: firmware: add comments to justify v3 header values
gpu: nova-core: firmware: fix and explain v2 header offsets computations
rust: io: turn IoCapable into a functional trait
rust: io: mem: use non-relaxed I/O ops in examples
rust: io: provide Mmio relaxed ops through a wrapper type
rust: io: remove legacy relaxed accessors of Mmio
rust: pci: io: remove overloaded Io methods of ConfigSpace
rust: io: remove overloaded Io methods of Mmio
rust: enable the `generic_arg_infer` feature
rust: num: add `shr` and `shl` methods to `Bounded`
rust: num: add `into_bool` method to `Bounded`
rust: num: make Bounded::get const
rust: io: add IoLoc type and generic I/O accessors
rust: io: use generic read/write accessors for primitive accesses
rust: io: add `register!` macro
rust: io: introduce `write_reg` and `LocatedRegister`
sample: rust: pci: use `register!` macro
gpu: nova-core: gsp: move Cmdq's DMA handle to a struct member
gpu: nova-core: introduce `bounded_enum` macro
gpu: nova-core: convert PMC registers to kernel register macro
gpu: nova-core: convert PBUS registers to kernel register macro
gpu: nova-core: convert PFB registers to kernel register macro
gpu: nova-core: convert GC6 registers to kernel register macro
gpu: nova-core: convert FUSE registers to kernel register macro
gpu: nova-core: convert PDISP registers to kernel register macro
gpu: nova-core: convert falcon registers to kernel register macro
gpu: nova-core: remove `io::` qualifier to register macro invocations
Documentation: nova: remove register abstraction task
rust: dma: add from-slice constructors for Coherent and CoherentBox
gpu: nova-core: firmware: riscv: use dma::Coherent
gpu: nova-core: firmware: fwsec: use dma::Coherent
gpu: nova-core: falcon: use dma::Coherent
gpu: nova-core: fb: use dma::CoherentHandle
gpu: nova-core: firmware: gsp: use dma::Coherent for signatures
gpu: nova-core: firmware: gsp: use dma::Coherent for level0 table
Alice Ryhl (2):
rust: workqueue: use new sync::aref path for imports
rust: drm: use new sync::aref path for imports
Asahi Lina (2):
rust: helpers: Add bindings/wrappers for dma_resv_lock
rust: drm: gem: shmem: Add DRM shmem helper abstraction
Daniel Almeida (4):
rust: workqueue: add support for ARef<T>
rust: drm: dispatch work items to the private data
rust: workqueue: add delayed work support for ARef<T>
rust: drm: dispatch delayed work items to the private data
Danilo Krummrich (14):
Merge tag 'v7.0-rc4' into drm-rust-next
Merge tag 'rust_io-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core into drm-rust-next
Merge tag 'drm-misc-next-2026-03-12' into drm-rust-next
rust: dma: use "kernel vertical" style for imports
rust: dma: introduce dma::CoherentBox for memory initialization
rust: dma: add Coherent:init() and Coherent::init_with_attrs()
gpu: nova-core: use Coherent::init to initialize GspFwWprMeta
gpu: nova-core: convert Gsp::new() to use CoherentBox
rust: dma: remove dma::CoherentAllocation<T>
rust: uaccess: generalize write_dma() to accept any Coherent<T>
rust: dma: generalize BinaryWriter impl for Coherent<T>
gpu: nova-core: use sized array for GSP log buffers
rust: dma: remove DMA_ATTR_NO_KERNEL_MAPPING from public attrs
rust: dma: add CoherentHandle for DMA allocations without kernel mapping
Deborah Brouwer (3):
drm/tyr: Use vertical style for imports
drm/tyr: Clarify driver/device type names
drm/tyr: Use DRM device type alias across driver
Eliot Courtney (19):
gpu: nova-core: gsp: fix incorrect advancing of write pointer
gpu: nova-core: gsp: clarify comments about invariants and pointer roles
gpu: nova-core: gsp: use empty slices instead of [0..0] ranges
gpu: nova-core: gsp: fix improper handling of empty slot in cmdq
gpu: nova-core: gsp: fix improper indexing in driver_read_area
gpu: nova-core: gsp: sort `MsgFunction` variants alphabetically
gpu: nova-core: gsp: add mechanism to wait for space on command queue
rust: add EMSGSIZE error code
gpu: nova-core: gsp: add checking oversized commands
gpu: nova-core: gsp: clarify invariant on command queue
gpu: nova-core: gsp: unconditionally call variable payload handling
gpu: nova-core: gsp: add `size` helper to `CommandToGsp`
gpu: nova-core: gsp: support large RPCs via continuation record
gpu: nova-core: gsp: add tests for continuation records
gpu: nova-core: gsp: fix stale doc comments on command queue methods
gpu: nova-core: gsp: add `RECEIVE_TIMEOUT` constant for command queue
gpu: nova-core: gsp: add reply/no-reply info to `CommandToGsp`
gpu: nova-core: gsp: make `Cmdq` a pinned type
gpu: nova-core: gsp: add mutex locking to Cmdq
Gary Guo (4):
gpu: nova-core: remove redundant `.as_ref()` for `dev_*` print
rust: dma: add generalized container for types other than slices
rust: dma: add zeroed constructor to `Coherent`
gpu: nova-core: convert to new dma::Coherent API
Joel Fernandes (9):
gpu: nova-core: use checked arithmetic in FWSEC firmware parsing
gpu: nova-core: use checked arithmetic in Booter signature parsing
gpu: nova-core: use checked arithmetic in frombytes_at helper
gpu: nova-core: use checked arithmetic in BinFirmware::data
gpu: nova-core: use checked arithmetic in RISC-V firmware parsing
gpu: nova-core: Kconfig: Sort select statements alphabetically
rust: interop: Add list module for C linked list interface
rust: gpu: Add GPU buddy allocator bindings
MAINTAINERS: gpu: buddy: Update reviewer
John Hubbard (6):
gpu: nova-core: fix aux device registration for multi-GPU systems
gpu: nova-core: print FB sizes, along with ranges
gpu: nova-core: add FbRange.len() and use it in boot.rs
gpu: nova-core: apply the one "use" item per line policy to commands.rs
gpu: nova-core: firmware: move firmware image parsing code to firmware.rs
gpu: nova-core: firmware: factor out an elf_str() function
Lyude Paul (5):
rust/drm: Fixup import styles
rust/drm: Remove imports covered by prelude::*
rust: drm: Add gem::impl_aref_for_gem_obj!
rust: gem: Introduce DriverObject::Args
rust: drm: gem: Add raw_dma_resv() function
Onur Özkan (1):
drm/tyr: gpu: fix GpuInfo::log model/version decoding
Timur Tabi (8):
gpu: nova-core: add PIO support for loading firmware images
gpu: nova-core: use the Generic Bootloader to boot FWSEC on Turing
rust: device: add device name method
rust: uaccess: add write_dma() for copying from DMA buffers to userspace
rust: dma: implement BinaryWriter for Coherent<[u8]>
gpu: nova-core: Replace module_pci_driver! with explicit module init
gpu: nova-core: create debugfs root in module init
gpu: nova-core: create GSP-RM logging buffers debugfs entries
Documentation/gpu/nova/core/todo.rst | 76 ------
MAINTAINERS | 18 +-
drivers/gpu/drm/Kconfig | 7 +
drivers/gpu/drm/nova/gem.rs | 5 +-
drivers/gpu/drm/tyr/driver.rs | 100 ++++----
drivers/gpu/drm/tyr/file.rs | 36 +--
drivers/gpu/drm/tyr/gem.rs | 18 +-
drivers/gpu/drm/tyr/gpu.rs | 58 ++---
drivers/gpu/drm/tyr/regs.rs | 16 +-
drivers/gpu/drm/tyr/tyr.rs | 4 +-
drivers/gpu/nova-core/Kconfig | 2 +-
drivers/gpu/nova-core/dma.rs | 54 -----
drivers/gpu/nova-core/driver.rs | 17 +-
drivers/gpu/nova-core/falcon.rs | 789 +++++++++++++++++++++++++++++++++++---------------------------
drivers/gpu/nova-core/falcon/gsp.rs | 27 ++-
drivers/gpu/nova-core/falcon/hal.rs | 6 +-
drivers/gpu/nova-core/falcon/hal/ga102.rs | 70 +++---
drivers/gpu/nova-core/falcon/hal/tu102.rs | 12 +-
drivers/gpu/nova-core/falcon/sec2.rs | 17 +-
drivers/gpu/nova-core/fb.rs | 101 ++++++--
drivers/gpu/nova-core/fb/hal/ga100.rs | 37 +--
drivers/gpu/nova-core/fb/hal/ga102.rs | 7 +-
drivers/gpu/nova-core/fb/hal/tu102.rs | 17 +-
drivers/gpu/nova-core/firmware.rs | 194 ++++++++++++----
drivers/gpu/nova-core/firmware/booter.rs | 87 +++----
drivers/gpu/nova-core/firmware/fwsec.rs | 181 +++++++--------
drivers/gpu/nova-core/firmware/fwsec/bootloader.rs | 350 ++++++++++++++++++++++++++++
drivers/gpu/nova-core/firmware/gsp.rs | 118 ++--------
drivers/gpu/nova-core/firmware/riscv.rs | 10 +-
drivers/gpu/nova-core/gfw.rs | 11 +-
drivers/gpu/nova-core/gpu.rs | 66 +++---
drivers/gpu/nova-core/gsp.rs | 118 ++++++----
drivers/gpu/nova-core/gsp/boot.rs | 82 +++----
drivers/gpu/nova-core/gsp/cmdq.rs | 397 ++++++++++++++++++++++---------
drivers/gpu/nova-core/gsp/cmdq/continuation.rs | 307 ++++++++++++++++++++++++
drivers/gpu/nova-core/gsp/commands.rs | 23 +-
drivers/gpu/nova-core/gsp/fw.rs | 309 ++++++++++---------------
drivers/gpu/nova-core/gsp/fw/commands.rs | 17 +-
drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs | 1 +
drivers/gpu/nova-core/gsp/sequencer.rs | 22 +-
drivers/gpu/nova-core/nova_core.rs | 54 ++++-
drivers/gpu/nova-core/num.rs | 80 +++++++
drivers/gpu/nova-core/regs.rs | 549 +++++++++++++++++++++++++------------------
drivers/gpu/nova-core/regs/macros.rs | 739 ----------------------------------------------------------
rust/bindings/bindings_helper.h | 14 ++
rust/helpers/device.c | 5 +
rust/helpers/dma-resv.c | 14 ++
rust/helpers/drm.c | 56 ++++-
rust/helpers/gpu.c | 17 ++
rust/helpers/helpers.c | 3 +
rust/helpers/list.c | 17 ++
rust/kernel/device.rs | 15 +-
rust/kernel/dma.rs | 899 +++++++++++++++++++++++++++++++++++++++++++++++++++++-----------------
rust/kernel/drm/device.rs | 87 ++++++-
rust/kernel/drm/driver.rs | 10 +-
rust/kernel/drm/file.rs | 8 +-
rust/kernel/drm/gem/mod.rs | 104 +++++++--
rust/kernel/drm/gem/shmem.rs | 228 ++++++++++++++++++
rust/kernel/error.rs | 1 +
rust/kernel/gpu.rs | 6 +
rust/kernel/gpu/buddy.rs | 614 ++++++++++++++++++++++++++++++++++++++++++++++++
rust/kernel/interop.rs | 9 +
rust/kernel/interop/list.rs | 339 +++++++++++++++++++++++++++
rust/kernel/io.rs | 780 ++++++++++++++++++++++++++++++++++++++-----------------------
rust/kernel/io/mem.rs | 10 +-
rust/kernel/io/register.rs | 1260 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
rust/kernel/lib.rs | 8 +
rust/kernel/num/bounded.rs | 70 +++++-
rust/kernel/pci/io.rs | 99 +++-----
rust/kernel/uaccess.rs | 91 +++++++-
rust/kernel/workqueue.rs | 104 ++++++++-
samples/rust/rust_dma.rs | 13 +-
samples/rust/rust_driver_pci.rs | 90 ++++++--
scripts/Makefile.build | 3 +-
74 files changed, 7125 insertions(+), 3058 deletions(-)
delete mode 100644 drivers/gpu/nova-core/dma.rs
create mode 100644 drivers/gpu/nova-core/firmware/fwsec/bootloader.rs
create mode 100644 drivers/gpu/nova-core/gsp/cmdq/continuation.rs
delete mode 100644 drivers/gpu/nova-core/regs/macros.rs
create mode 100644 rust/helpers/dma-resv.c
create mode 100644 rust/helpers/gpu.c
create mode 100644 rust/helpers/list.c
create mode 100644 rust/kernel/drm/gem/shmem.rs
create mode 100644 rust/kernel/gpu.rs
create mode 100644 rust/kernel/gpu/buddy.rs
create mode 100644 rust/kernel/interop.rs
create mode 100644 rust/kernel/interop/list.rs
create mode 100644 rust/kernel/io/register.rs