kernel/linux.git/samples/rust/rust_driver_platform.rs, branch v6.19.11

Merge tag 'driver-core-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core

2025-12-06T05:29:02+00:00

Pull driver core updates from Danilo Krummrich: "Arch Topology: - Move parse_acpi_topology() from arm64 to common code for reuse in RISC-V CPU: - Expose housekeeping CPUs through /sys/devices/system/cpu/housekeeping - Print a newline (or 0x0A) instead of '(null)' reading /sys/devices/system/cpu/nohz_full when nohz_full= is not set debugfs - Remove (broken) 'no-mount' mode - Remove redundant access mode checks in debugfs_get_tree() and debugfs_create_*() functions Devres: - Remove unused devm_free_percpu() helper - Move devm_alloc_percpu() from device.h to devres.h Firmware Loader: - Replace simple_strtol() with kstrtoint() - Do not call cancel_store() when no upload is in progress kernfs: - Increase struct super_block::maxbytes to MAX_LFS_FILESIZE - Fix a missing unwind path in __kernfs_new_node() Misc: - Increase the name size in struct auxiliary_device_id to 40 characters - Replace system_unbound_wq with system_dfl_wq and add WQ_PERCPU to alloc_workqueue() Platform: - Replace ERR_PTR() with IOMEM_ERR_PTR() in platform ioremap functions Rust: - Auxiliary: - Unregister auxiliary device on parent device unbind - Move parent() to impl Device; implement device context aware parent() for Device - Illustrate how to safely obtain a driver's device private data when calling from an auxiliary driver into the parant device driver - DebugFs: - Implement support for binary large objects - Device: - Let probe() return the driver's device private data as pinned initializer, i.e. impl PinInit - Implement safe accessor for a driver's device private data for Device (returned reference can't out-live driver binding and guarantees the correct private data type) - Implement AsBusDevice trait, to be used by class device abstractions to derive the bus device type of the parent device - DMA: - Store raw pointer of allocation as NonNull - Use start_ptr() and start_ptr_mut() to inherit correct mutability of self - FS: - Add file::Offset type alias - I2C: - Add abstractions for I2C device / driver infrastructure - Implement abstractions for manual I2C device registrations - I/O: - Use "kernel vertical" style for imports - Define ResourceSize as resource_size_t - Move ResourceSize to top-level I/O module - Add type alias for phys_addr_t - Implement Rust version of read_poll_timeout_atomic() - PCI: - Use "kernel vertical" style for imports - Move I/O and IRQ infrastructure to separate files - Add support for PCI interrupt vectors - Implement TryInto> for IrqVector<'a> to convert an IrqVector bound to specific pci::Device into an IrqRequest bound to the same pci::Device's parent Device - Leverage pin_init_scope() to get rid of redundant Result in IRQ methods - PinInit: - Add {pin_}init_scope() to execute code before creating an initializer - Platform: - Leverage pin_init_scope() to get rid of redundant Result in IRQ methods - Timekeeping: - Implement abstraction of udelay() - Uaccess: - Implement read_slice_partial() and read_slice_file() for UserSliceReader - Implement write_slice_partial() and write_slice_file() for UserSliceWriter sysfs: - Prepare the constification of struct attribute" * tag 'driver-core-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core: (75 commits) rust: pci: fix build failure when CONFIG_PCI_MSI is disabled debugfs: Fix default access mode config check debugfs: Remove broken no-mount mode debugfs: Remove redundant access mode checks driver core: Check drivers_autoprobe for all added devices driver core: WQ_PERCPU added to alloc_workqueue users driver core: replace use of system_unbound_wq with system_dfl_wq tick/nohz: Expose housekeeping CPUs in sysfs tick/nohz: avoid showing '(null)' if nohz_full= not set sysfs/cpu: Use DEVICE_ATTR_RO for nohz_full attribute kernfs: fix memory leak of kernfs_iattrs in __kernfs_new_node fs/kernfs: raise sb->maxbytes to MAX_LFS_FILESIZE mod_devicetable: Bump auxiliary_device_id name size sysfs: simplify attribute definition macros samples/kobject: constify 'struct foo_attribute' samples/kobject: add is_visible() callback to attribute group sysfs: attribute_group: enable const variants of is_visible() sysfs: introduce __SYSFS_FUNCTION_ALTERNATIVE() sysfs: transparently handle const pointers in ATTRIBUTE_GROUPS() sysfs: attribute_group: allow registration of const attribute ...

rust: driver: let probe() return impl PinInit

2025-10-21T16:40:48+00:00

The driver model defines the lifetime of the private data stored in (and owned by) a bus device to be valid from when the driver is bound to a device (i.e. from successful probe()) until the driver is unbound from the device. This is already taken care of by the Rust implementation of the driver model. However, we still ask drivers to return a Result>> from probe(). Unlike in C, where we do not have the concept of initializers, but rather deal with uninitialized memory, drivers can just return an impl PinInit instead. This contributes to more clarity to the fact that a driver returns it's device private data in probe() and the Rust driver model owns the data, manages the lifetime and - considering the lifetime - provides (safe) accessors for the driver. Hence, let probe() functions return an impl PinInit instead of Result>>. Reviewed-by: Alice Ryhl Acked-by: Viresh Kumar Reviewed-by: Alexandre Courbot Acked-by: Greg Kroah-Hartman Signed-off-by: Danilo Krummrich

samples: rust: platform: remove trailing commas

2025-10-20T02:04:23+00:00

This prepares for a later commit in which we introduce a custom formatting macro; that macro doesn't handle trailing commas so just remove them. Acked-by: Danilo Krummrich Reviewed-by: Benno Lossin Signed-off-by: Tamir Duberstein Link: https://patch.msgid.link/20251018-cstr-core-v18-1-9378a54385f8@gmail.com Signed-off-by: Miguel Ojeda

rust: driver-core: Update ARef and AlwaysRefCounted imports from sync::aref

2025-08-15T20:34:41+00:00

Update call sites in the driver-core files and its related samples to import `ARef` and `AlwaysRefCounted` from `sync::aref` instead of `types`. This aligns with the ongoing effort to move `ARef` and `AlwaysRefCounted` to sync. Suggested-by: Benno Lossin Link: https://github.com/Rust-for-Linux/linux/issues/1173 Signed-off-by: Shankari Anand Link: https://lore.kernel.org/r/20250814104615.355106-1-shankari.ak0208@gmail.com Signed-off-by: Danilo Krummrich

samples: rust: add ACPI match table example to platform driver

2025-06-26T21:26:15+00:00

Extend the Rust sample platform driver to probe using device/driver name matching, OF ID table matching, or ACPI ID table matching. Signed-off-by: Igor Korotin Link: https://lore.kernel.org/r/20250620154552.299932-1-igor.korotin.linux@gmail.com [ Use 'LNUXBEEF' as ACPI ID. - Danilo ] Signed-off-by: Danilo Krummrich

samples: rust: platform: conditionally call Self::properties_parse()

2025-06-25T16:10:12+00:00

Only call Self::properties_parse() when the FwNode is an OF node. Once we add ACPI support, we don't want the ACPI device to fail probing in Self::properties_parse(). Signed-off-by: Igor Korotin Link: https://lore.kernel.org/r/20250620152103.282763-1-igor.korotin.linux@gmail.com Signed-off-by: Danilo Krummrich

samples: rust: platform: don't call as_ref() repeatedly

2025-06-25T16:10:12+00:00

In SampleDriver::probe() don't call pdev.as_ref() repeatedly, instead introduce a dedicated &Device. Signed-off-by: Igor Korotin Reviewed-by: Dirk Behme Link: https://lore.kernel.org/r/20250620151849.281238-1-igor.korotin.linux@gmail.com Signed-off-by: Danilo Krummrich

samples: rust: platform: Add property child and reference args examples

2025-06-25T15:48:41+00:00

Add some example usage of the device property methods for reading DT/ACPI/swnode child nodes and reference args. Signed-off-by: Remo Senekowitsch Link: https://lore.kernel.org/r/20250616154511.1862909-4-remo@buenzli.dev [ Convert 'child@{0,1}' to 'child-{0,1}'; skip child nodes without 'compatible' property in of_unittest_platform_populate() as proposed by Rob Herring. - Danilo] Signed-off-by: Danilo Krummrich

samples: rust: platform: Add property read examples

2025-06-12T23:14:13+00:00

Add some example usage of the device property read methods for DT/ACPI/swnode properties. Tested-by: Dirk Behme Co-developed-by: Rob Herring (Arm) Signed-off-by: Rob Herring (Arm) Signed-off-by: Remo Senekowitsch Link: https://lore.kernel.org/r/20250611102908.212514-10-remo@buenzli.dev Signed-off-by: Danilo Krummrich

Merge tag 'driver-core-6.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

2025-04-01T18:02:03+00:00

Pull driver core updatesk from Greg KH: "Here is the big set of driver core updates for 6.15-rc1. Lots of stuff happened this development cycle, including: - kernfs scaling changes to make it even faster thanks to rcu - bin_attribute constify work in many subsystems - faux bus minor tweaks for the rust bindings - rust binding updates for driver core, pci, and platform busses, making more functionaliy available to rust drivers. These are all due to people actually trying to use the bindings that were in 6.14. - make Rafael and Danilo full co-maintainers of the driver core codebase - other minor fixes and updates" * tag 'driver-core-6.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (52 commits) rust: platform: require Send for Driver trait implementers rust: pci: require Send for Driver trait implementers rust: platform: impl Send + Sync for platform::Device rust: pci: impl Send + Sync for pci::Device rust: platform: fix unrestricted &mut platform::Device rust: pci: fix unrestricted &mut pci::Device rust: device: implement device context marker rust: pci: use to_result() in enable_device_mem() MAINTAINERS: driver core: mark Rafael and Danilo as co-maintainers rust/kernel/faux: mark Registration methods inline driver core: faux: only create the device if probe() succeeds rust/faux: Add missing parent argument to Registration::new() rust/faux: Drop #[repr(transparent)] from faux::Registration rust: io: fix devres test with new io accessor functions rust: io: rename `io::Io` accessors kernfs: Move dput() outside of the RCU section. efi: rci2: mark bin_attribute as __ro_after_init rapidio: constify 'struct bin_attribute' firmware: qemu_fw_cfg: constify 'struct bin_attribute' powerpc/perf/hv-24x7: Constify 'struct bin_attribute' ...