Changes in register.rs

0fc8f6200d2313278fbf4539bbab74677c685531 - Merge drm/drm-fixes into drm-misc-fixes

Mon, 27 Apr 2026 10:26:49 +0200

Merge drm/drm-fixes into drm-misc-fixesGetting fixes and updates from v7.1-rc1.Signed-off-by: Thomas Zimmermann List of files: /linux/rust/kernel/io/register.rs

4793dae01f47754e288cdbb3a22581cac2317f2b - Merge tag 'driver-core-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core

Tue, 14 Apr 2026 04:03:11 +0200

Merge tag 'driver-core-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-corePull driver core updates from Danilo Krummrich: "debugfs: - Fix NULL pointer dereference in debugfs_create_str() - Fix misplaced EXPORT_SYMBOL_GPL for debugfs_create_str() - Fix soundwire debugfs NULL pointer dereference from uninitialized firmware_file device property: - Make fwnode flags modifications thread safe; widen the field to unsigned long and use set_bit() / clear_bit() based accessors - Document how to check for the property presence devres: - Separate struct devres_node from its "subclasses" (struct devres, struct devres_group); give struct devres_node its own release and free callbacks for per-type dispatch - Introduce struct devres_action for devres actions, avoiding the ARCH_DMA_MINALIGN alignment overhead of struct devres - Export struct devres_node and its init/add/remove/dbginfo primitives for use by Rust Devres - Fix missing node debug info in devm_krealloc() - Use guard(spinlock_irqsave) where applicable; consolidate unlock paths in devres_release_group() driver_override: - Convert PCI, WMI, vdpa, s390/cio, s390/ap, and fsl-mc to the generic driver_override infrastructure, replacing per-bus driver_override strings, sysfs attributes, and match logic; fixes a potential UAF from unsynchronized access to driver_override in bus match() callbacks - Simplify __device_set_driver_override() logic kernfs: - Send IN_DELETE_SELF and IN_IGNORED inotify events on kernfs file and directory removal - Add corresponding selftests for memcg platform: - Allow attaching software nodes when creating platform devices via a new 'swnode' field in struct platform_device_info - Add kerneldoc for struct platform_device_info software node: - Move software node initialization from postcore_initcall() to driver_init(), making it available early in the boot process - Move kernel_kobj initialization (ksysfs_init) earlier to support the above - Remove software_node_exit(); dead code in a built-in unit SoC: - Introduce of_machine_read_compatible() and of_machine_read_model() OF helpers and export soc_attr_read_machine() to replace direct accesses to of_root from SoC drivers; also enables CONFIG_COMPILE_TEST coverage for these drivers sysfs: - Constify attribute group array pointers to 'const struct attribute_group *const *' in sysfs functions, device_add_groups() / device_remove_groups(), and struct class Rust: - Devres: - Embed struct devres_node directly in Devres instead of going through devm_add_action(), avoiding the extra allocation and the unnecessary ARCH_DMA_MINALIGN alignment - I/O: - Turn IoCapable from a marker trait into a functional trait carrying the raw I/O accessor implementation (io_read / io_write), providing working defaults for the per-type Io methods - Add RelaxedMmio wrapper type, making relaxed accessors usable in code generic over the Io trait - Remove overloaded per-type Io methods and per-backend macros from Mmio and PCI ConfigSpace - I/O (Register): - Add IoLoc trait and generic read/write/update methods to the Io trait, making I/O operations parameterizable by typed locations - Add register! macro for defining hardware register types with typed bitfield accessors backed by Bounded values; supports direct, relative, and array register addressing - Add write_reg() / try_write_reg() and LocatedRegister trait - Update PCI sample driver to demonstrate the register! macro Example: ``` register! { /// UART control register. CTRL(u32) @ 0x18 { /// Receiver enable. 19:19 rx_enable => bool; /// Parity configuration. 14:13 parity ?=> Parity; } /// FIFO watermark and counter register. WATER(u32) @ 0x2c { /// Number of datawords in the receive FIFO. 26:24 rx_count; /// RX interrupt threshold. 17:16 rx_water; } } impl WATER { fn rx_above_watermark(&self) -> bool { self.rx_count() > self.rx_water() } } fn init(bar: &pci::Bar) { let water = WATER::zeroed() .with_const_rx_water::<1>(); // > 3 would not compile bar.write_reg(water); let ctrl = CTRL::zeroed() .with_parity(Parity::Even) .with_rx_enable(true); bar.write_reg(ctrl); } fn handle_rx(bar: &pci::Bar) { if bar.read(WATER).rx_above_watermark() { // drain the FIFO } } fn set_parity(bar: &pci::Bar, parity: Parity) { bar.update(CTRL, |r| r.with_parity(parity)); } ``` - IRQ: - Move 'static bounds from where clauses to trait declarations for IRQ handler traits - Misc: - Enable the generic_arg_infer Rust feature - Extend Bounded with shift operations, single-bit bool conversion, and const get() Misc: - Make deferred_probe_timeout default a Kconfig option - Drop auxiliary_dev_pm_ops; the PM core falls back to driver PM callbacks when no bus type PM ops are set - Add conditional guard support for device_lock() - Add ksysfs.c to the DRIVER CORE MAINTAINERS entry - Fix kernel-doc warnings in base.h - Fix stale reference to memory_block_add_nid() in documentation"* tag 'driver-core-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core: (67 commits) bus: fsl-mc: use generic driver_override infrastructure s390/ap: use generic driver_override infrastructure s390/cio: use generic driver_override infrastructure vdpa: use generic driver_override infrastructure platform/wmi: use generic driver_override infrastructure PCI: use generic driver_override infrastructure driver core: make software nodes available earlier software node: remove software_node_exit() kernel: ksysfs: initialize kernel_kobj earlier MAINTAINERS: add ksysfs.c to the DRIVER CORE entry drivers/base/memory: fix stale reference to memory_block_add_nid() device property: Document how to check for the property presence soundwire: debugfs: initialize firmware_file to empty string debugfs: fix placement of EXPORT_SYMBOL_GPL for debugfs_create_str() debugfs: check for NULL pointer in debugfs_create_str() driver core: Make deferred_probe_timeout default a Kconfig option driver core: simplify __device_set_driver_override() clearing logic driver core: auxiliary bus: Drop auxiliary_dev_pm_ops device property: Make modifications of fwnode "flags" thread safe rust: devres: embed struct devres_node directly ... List of files: /linux/rust/kernel/io/register.rs

9bdbf7eb25b3121ef19533df4fb70f2c39fc0d6a - Merge tag 'drm-rust-next-2026-03-30' of https://gitlab.freedesktop.org/drm/rust/kernel into drm-next

Tue, 31 Mar 2026 23:20:59 +0200

Merge tag 'drm-rust-next-2026-03-30' of https://gitlab.freedesktop.org/drm/rust/kernel into drm-nextDRM Rust changes for v7.1-rc1- DMA: - Rework the DMA coherent API: introduce Coherent as a generalized container for arbitrary types, replacing the slice-only CoherentAllocation. 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- 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 support for work and delayed workSigned-off-by: Dave Airlie From: "Danilo Krummrich" Link: https://patch.msgid.link/DHGH4BLT03BU.ZJH5U52WE8BY@kernel.org List of files: /linux/rust/kernel/io/register.rs

d19ab42867ae7c68be84ed957d95712b7934773f - 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

Tue, 17 Mar 2026 20:13:16 +0100

Merge tag 'rust_io-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core into drm-rust-nextRegister abstraction and I/O infrastructure improvementsIntroduce the register!() macro to define type-safe I/O registeraccesses. Refactor the IoCapable trait into a functional trait, whichsimplifies I/O backends and removes the need for overloaded Io methods.This is a stable tag for other trees to merge.Signed-off-by: Danilo Krummrich List of files: /linux/rust/kernel/io/register.rs

de25dc008ea74bc6f33b8d6e773e51a920813fdc - Merge tag 'rust_io-7.1-rc1' into driver-core-next

Tue, 17 Mar 2026 20:11:03 +0100

Merge tag 'rust_io-7.1-rc1' into driver-core-nextRegister abstraction and I/O infrastructure improvementsIntroduce the register!() macro to define type-safe I/O registeraccesses. Refactor the IoCapable trait into a functional trait, whichsimplifies I/O backends and removes the need for overloaded Io methods.This is a stable tag for other trees to merge.Signed-off-by: Danilo Krummrich List of files: /linux/rust/kernel/io/register.rs

9a52a8f5ed97d47c9641248874f4c6a78e136d97 - rust: io: introduce `write_reg` and `LocatedRegister`

Sat, 14 Mar 2026 02:06:18 +0100

rust: io: introduce `write_reg` and `LocatedRegister`Some I/O types, like fixed address registers, carry their locationalongside their values. For these types, the regular `Io::write` methodcan lead into repeating the location information twice: once to providethe location itself, another time to build the value.We are also considering supporting making all register values carrytheir full location information for convenience and safety.Add a new `Io::write_reg` method that takes a single argumentimplementing `LocatedRegister`, a trait that decomposes implementorsinto a `(location, value)` tuple. This allows write operations on fixedoffset registers to be done while specifying their name only once.Suggested-by: Danilo Krummrich Link: https://lore.kernel.org/all/DH0XBLXZD81K.22SWIZ1ZAOW1@kernel.org/Signed-off-by: Alexandre Courbot Link: https://patch.msgid.link/20260314-register-v9-8-86805b2f7e9d@nvidia.com[ Replace FIFO with VERSION register in the examples. - Danilo ]Signed-off-by: Danilo Krummrich List of files: /linux/rust/kernel/io/register.rs

20ba6a1dbcb957152f6d858015b3a3311dd6da49 - rust: io: add `register!` macro

Sat, 14 Mar 2026 02:06:17 +0100

rust: io: add `register!` macroAdd a macro for defining hardware register types with I/O accessors.Each register field is represented as a `Bounded` of the appropriate bitwidth, ensuring field values are never silently truncated.Fields can optionally be converted to/from custom types, either falliblyor infallibly.The address of registers can be direct, relative, or indexed, supportingmost of the patterns in which registers are arranged.Suggested-by: Danilo Krummrich Link: https://lore.kernel.org/all/20250306222336.23482-6-dakr@kernel.org/Co-developed-by: Gary Guo Signed-off-by: Gary Guo Signed-off-by: Alexandre Courbot Link: https://patch.msgid.link/20260314-register-v9-7-86805b2f7e9d@nvidia.com[ * Improve wording and formatting of doc-comments, * Import build_assert!(), * Add missing inline annotations, * Call static_assert!() with absolute path, * Use expect instead of allow. - Danilo ]Signed-off-by: Danilo Krummrich List of files: /linux/rust/kernel/io/register.rs