linux/drivers/cpufreq, branch v6.17

cpufreq: Initialize cpufreq-based invariance before subsys

2025-09-20T11:00:20Z

commit 2a6c72738706 ("cpufreq: Initialize cpufreq-based frequency-invariance later") postponed the frequency invariance initialization to avoid disabling it in the error case. This isn't locking safe, instead move the initialization up before the subsys interface is registered (which will rebuild the sched_domains) and add the corresponding disable on the error path. Observed lockdep without this patch: [ 0.989686] ====================================================== [ 0.989688] WARNING: possible circular locking dependency detected [ 0.989690] 6.17.0-rc4-cix-build+ #31 Tainted: G S [ 0.989691] ------------------------------------------------------ [ 0.989692] swapper/0/1 is trying to acquire lock: [ 0.989693] ffff800082ada7f8 (sched_energy_mutex){+.+.}-{4:4}, at: rebuild_sched_domains_energy+0x30/0x58 [ 0.989705] but task is already holding lock: [ 0.989706] ffff000088c89bc8 (&policy->rwsem){+.+.}-{4:4}, at: cpufreq_online+0x7f8/0xbe0 [ 0.989713] which lock already depends on the new lock. Fixes: 2a6c72738706 ("cpufreq: Initialize cpufreq-based frequency-invariance later") Signed-off-by: Christian Loehle Signed-off-by: Rafael J. Wysocki

Merge branches 'pm-sleep' and 'pm-em'

2025-09-11T12:22:35Z

Merge a hibernation regression fix and an fix related to energy model management for 6.17-rc6 * pm-sleep: PM: hibernate: Restrict GFP mask in hibernation_snapshot() * pm-em: PM: EM: Add function for registering a PD without capacity update

PM: EM: Add function for registering a PD without capacity update

2025-09-10T10:03:19Z

The intel_pstate driver manages CPU capacity changes itself and it does not need an update of the capacity of all CPUs in the system to be carried out after registering a PD. Moreover, in some configurations (for instance, an SMT-capable hybrid x86 system booted with nosmt in the kernel command line) the em_check_capacity_update() call at the end of em_dev_register_perf_domain() always fails and reschedules itself to run once again in 1 s, so effectively it runs in vain every 1 s forever. To address this, introduce a new variant of em_dev_register_perf_domain(), called em_dev_register_pd_no_update(), that does not invoke em_check_capacity_update(), and make intel_pstate use it instead of the original. Fixes: 7b010f9b9061 ("cpufreq: intel_pstate: EAS support for hybrid platforms") Closes: https://lore.kernel.org/linux-pm/40212796-734c-4140-8a85-854f72b8144d@panix.com/ Reported-by: Kenneth R. Crudup Tested-by: Kenneth R. Crudup Cc: 6.16+ # 6.16+ Signed-off-by: Rafael J. Wysocki

cpufreq/amd-pstate: Fix a regression leading to EPP 0 after resume

2025-09-03T14:17:34Z

During the suspend sequence the cached CPPC request is destroyed with the expectation that it's restored during resume. This assumption broke when the separate cache EPP variable was removed, and then it was broken again by commit 608a76b65288 ("cpufreq/amd-pstate: Add support for the "Requested CPU Min frequency" BIOS option") which explicitly set it to zero during suspend. Remove the invalidation and set the value during the suspend call to update limits so that the cached variable can be used to restore on resume. Fixes: 608a76b65288 ("cpufreq/amd-pstate: Add support for the "Requested CPU Min frequency" BIOS option") Fixes: b7a41156588a ("cpufreq/amd-pstate: Invalidate cppc_req_cached during suspend") Reported-by: goldens Closes: https://community.frame.work/t/increased-power-usage-after-resuming-from-suspend-on-ryzen-7040-kernel-6-15-regression/ Closes: https://bugzilla.redhat.com/show_bug.cgi?id=2391221 Tested-by: goldens Tested-by: Willian Wang Reported-by: Vincent Mauirn Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219981 Tested-by: Alex De Lorenzo Reviewed-by: Gautham R. Shenoy Link: https://lore.kernel.org/r/20250826052747.2240670-1-superm1@kernel.org Signed-off-by: Mario Limonciello (AMD)

cpufreq/amd-pstate: Fix setting of CPPC.min_perf in active mode for performance governor

2025-08-21T14:34:52Z

In the "active" mode of the amd-pstate driver with performance governor, the CPPC.min_perf is expected to be the nominal_perf. However after commit a9b9b4c2a4cd ("cpufreq/amd-pstate: Drop min and max cached frequencies"), this is not the case when the governor is switched from performance to powersave and back to performance, and the CPPC.min_perf will be equal to the scaling_min_freq that was set for the powersave governor. This is because prior to commit a9b9b4c2a4cd ("cpufreq/amd-pstate: Drop min and max cached frequencies"), amd_pstate_epp_update_limit() would unconditionally call amd_pstate_update_min_max_limit() and the latter function would enforce the CPPC.min_perf constraint when the governor is performance. However, after the aforementioned commit, amd_pstate_update_min_max_limit() is called by amd_pstate_epp_update_limit() only when either the scaling_{min/max}_freq is different from the cached value of cpudata->{min/max}_limit_freq, which wouldn't have changed on a governor transition from powersave to performance, thus missing out on enforcing the CPPC.min_perf constraint for the performance governor. Fix this by invoking amd_pstate_epp_udpate_limit() not only when the {min/max} limits have changed from the cached values, but also when the policy itself has changed. Fixes: a9b9b4c2a4cd ("cpufreq/amd-pstate: Drop min and max cached frequencies") Signed-off-by: Gautham R. Shenoy Reviewed-by: Mario Limonciello Link: https://lore.kernel.org/r/20250821042638.356-1-gautham.shenoy@amd.com Signed-off-by: Mario Limonciello (AMD)

cpufreq: intel_pstate: Support Clearwater Forest OOB mode

2025-08-11T19:49:47Z

Prevent intel_pstate from loading when OOB (Out Of Band) P-states mode is enabled. Signed-off-by: Srinivas Pandruvada Link: https://patch.msgid.link/20250808145122.4057208-1-srinivas.pandruvada@linux.intel.com Signed-off-by: Rafael J. Wysocki

Merge tag 'rust-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ojeda/linux

2025-08-03T20:49:10Z

Pull Rust updates from Miguel Ojeda: "Toolchain and infrastructure: - Enable a set of Clippy lints: 'ptr_as_ptr', 'ptr_cast_constness', 'as_ptr_cast_mut', 'as_underscore', 'cast_lossless' and 'ref_as_ptr' These are intended to avoid type casts with the 'as' operator, which are quite powerful, into restricted variants that are less powerful and thus should help to avoid mistakes - Remove the 'author' key now that most instances were moved to the plural one in the previous cycle 'kernel' crate: - New 'bug' module: add 'warn_on!' macro which reuses the existing 'BUG'/'WARN' infrastructure, i.e. it respects the usual sysctls and kernel parameters: warn_on!(value == 42); To avoid duplicating the assembly code, the same strategy is followed as for the static branch code in order to share the assembly between both C and Rust This required a few rearrangements on C arch headers -- the existing C macros should still generate the same outputs, thus no functional change expected there - 'workqueue' module: add delayed work items, including a 'DelayedWork' struct, a 'impl_has_delayed_work!' macro and an 'enqueue_delayed' method, e.g.: /// Enqueue the struct for execution on the system workqueue, /// where its value will be printed 42 jiffies later. fn print_later(value: Arc) { let _ = workqueue::system().enqueue_delayed(value, 42); } - New 'bits' module: add support for 'bit' and 'genmask' functions, with runtime- and compile-time variants, e.g.: static_assert!(0b00010000 == bit_u8(4)); static_assert!(0b00011110 == genmask_u8(1..=4)); assert!(checked_bit_u32(u32::BITS).is_none()); - 'uaccess' module: add 'UserSliceReader::strcpy_into_buf', which reads NUL-terminated strings from userspace into a '&CStr' Introduce 'UserPtr' newtype, similar in purpose to '__user' in C, to minimize mistakes handling userspace pointers, including mixing them up with integers and leaking them via the 'Debug' trait. Add it to the prelude, too - Start preparations for the replacement of our custom 'CStr' type with the analogous type in the 'core' standard library. This will take place across several cycles to make it easier. For this one, it includes a new 'fmt' module, using upstream method names and some other cleanups Replace 'fmt!' with a re-export, which helps Clippy lint properly, and clean up the found 'uninlined-format-args' instances - 'dma' module: - Clarify wording and be consistent in 'coherent' nomenclature - Convert the 'read!()' and 'write!()' macros to return a 'Result' - Add 'as_slice()', 'write()' methods in 'CoherentAllocation' - Expose 'count()' and 'size()' in 'CoherentAllocation' and add the corresponding type invariants - Implement 'CoherentAllocation::dma_handle_with_offset()' - 'time' module: - Make 'Instant' generic over clock source. This allows the compiler to assert that arithmetic expressions involving the 'Instant' use 'Instants' based on the same clock source - Make 'HrTimer' generic over the timer mode. 'HrTimer' timers take a 'Duration' or an 'Instant' when setting the expiry time, depending on the timer mode. With this change, the compiler can check the type matches the timer mode - Add an abstraction for 'fsleep'. 'fsleep' is a flexible sleep function that will select an appropriate sleep method depending on the requested sleep time - Avoid 64-bit divisions on 32-bit hardware when calculating timestamps - Seal the 'HrTimerMode' trait. This prevents users of the 'HrTimerMode' from implementing the trait on their own types - Pass the correct timer mode ID to 'hrtimer_start_range_ns()' - 'list' module: remove 'OFFSET' constants, allowing to remove pointer arithmetic; now 'impl_list_item!' invokes 'impl_has_list_links!' or 'impl_has_list_links_self_ptr!'. Other simplifications too - 'types' module: remove 'ForeignOwnable::PointedTo' in favor of a constant, which avoids exposing the type of the opaque pointer, and require 'into_foreign' to return non-null Remove the 'Either' type as well. It is unused, and we want to encourage the use of custom enums for concrete use cases - 'sync' module: implement 'Borrow' and 'BorrowMut' for 'Arc' types to allow them to be used in generic APIs - 'alloc' module: implement 'Borrow' and 'BorrowMut' for 'Box'; and 'Borrow', 'BorrowMut' and 'Default' for 'Vec' - 'Opaque' type: add 'cast_from' method to perform a restricted cast that cannot change the inner type and use it in callers of 'container_of!'. Rename 'raw_get' to 'cast_into' to match it - 'rbtree' module: add 'is_empty' method - 'sync' module: new 'aref' submodule to hold 'AlwaysRefCounted' and 'ARef', which are moved from the too general 'types' module which we want to reduce or eventually remove. Also fix a safety comment in 'static_lock_class' 'pin-init' crate: - Add 'impl [Pin]Init for Result', so results are now (pin-)initializers - Add 'Zeroable::init_zeroed()' that delegates to 'init_zeroed()' - New 'zeroed()', a safe version of 'mem::zeroed()' and also provide it via 'Zeroable::zeroed()' - Implement 'Zeroable' for 'Option<&T>', 'Option<&mut T>' and for 'Option<[unsafe] [extern "abi"] fn(...args...) -> ret>' for '"Rust"' and '"C"' ABIs and up to 20 arguments - Changed blanket impls of 'Init' and 'PinInit' from 'impl [Pin]Init for T' to 'impl [Pin]Init for T' - Renamed 'zeroed()' to 'init_zeroed()' - Upstream dev news: improve CI more to deny warnings, use '--all-targets'. Check the synchronization status of the two '-next' branches in upstream and the kernel MAINTAINERS: - Add Vlastimil Babka, Liam R. Howlett, Uladzislau Rezki and Lorenzo Stoakes as reviewers (thanks everyone) And a few other cleanups and improvements" * tag 'rust-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ojeda/linux: (76 commits) rust: Add warn_on macro arm64/bug: Add ARCH_WARN_ASM macro for BUG/WARN asm code sharing with Rust riscv/bug: Add ARCH_WARN_ASM macro for BUG/WARN asm code sharing with Rust x86/bug: Add ARCH_WARN_ASM macro for BUG/WARN asm code sharing with Rust rust: kernel: move ARef and AlwaysRefCounted to sync::aref rust: sync: fix safety comment for `static_lock_class` rust: types: remove `Either` rust: kernel: use `core::ffi::CStr` method names rust: str: add `CStr` methods matching `core::ffi::CStr` rust: str: remove unnecessary qualification rust: use `kernel::{fmt,prelude::fmt!}` rust: kernel: add `fmt` module rust: kernel: remove `fmt!`, fix clippy::uninlined-format-args scripts: rust: emit path candidates in panic message scripts: rust: replace length checks with match rust: list: remove nonexistent generic parameter in link rust: bits: add support for bits/genmask macros rust: list: remove OFFSET constants rust: list: add `impl_list_item!` examples rust: list: use fully qualified path ...

Merge tag 'trace-unused-v6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

2025-07-30T23:41:58Z

Pull tracepoint cleanup from Steven Rostedt: "Remove or hide unused tracepoints Tracepoints take up memory (around 5K per tracepoint) even when they are unused. Changes are being made to detect when a tracepoint is defined but unused and a warning is shown at build. But those changes are not yet ready for inclusion. - Fix some of the unused tracepoints that it detected Some tracepoints were removed and others were hidden by config settings to match the config settings of where they are instantiated. Some tracepoints were moved into architecture specific code as only one architecture used them. - Call the ftrace_test_filter tracepoint in an unreachable if statement The ftrace_test_filter tracepoint which is defined when ftrace selftests are configured and is used to test the filter logic, but the tracepoint is not actually called. It is put into an if statement to not have it get compiled out, but also not warn for not being used" * tag 'trace-unused-v6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: tracing: sched: Hide numa events under CONFIG_NUMA_BALANCING powerpc/thp: tracing: Hide hugepage events under CONFIG_PPC_BOOK3S_64 tracing: Call trace_ftrace_test_filter() for the event tracing: arm: arm64: Hide trace events ipi_raise, ipi_entry and ipi_exit binder: Remove unused binder lock events PM: tracing: Hide power_domain_target event under ARCH_OMAP2PLUS PM: tracing: Hide device_pm_callback events under PM_SLEEP PM: tracing: Hide psci_domain_idle events under ARM_PSCI_CPUIDLE PM: cpufreq: powernv/tracing: Move powernv_throttle trace event alarmtimer: Hide alarmtimer_suspend event when RTC_CLASS is not configured tracing, AER: Hide PCIe AER event when PCIEAER is not configured

Merge tag 'x86-platform-2025-07-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2025-07-30T03:05:06Z

Pull x86 platform updates from Ingo Molnar: "This adds support for the AMD hardware feedback interface (HFI), by Perry Yuan" * tag 'x86-platform-2025-07-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/itmt: Add debugfs file to show core priorities platform/x86/amd: hfi: Add debugfs support platform/x86/amd: hfi: Set ITMT priority from ranking data cpufreq/amd-pstate: Disable preferred cores on designs with workload classification x86/process: Clear hardware feedback history for AMD processors platform/x86: hfi: Add power management callback platform/x86: hfi: Add online and offline callback support platform/x86: hfi: Init per-cpu scores for each class platform/x86: hfi: Parse CPU core ranking data from shared memory platform/x86: hfi: Introduce AMD Hardware Feedback Interface Driver x86/msr-index: Add AMD workload classification MSRs MAINTAINERS: Add maintainer entry for AMD Hardware Feedback Driver Documentation/x86: Add AMD Hardware Feedback Interface documentation

Merge tag 'driver-core-6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core

2025-07-29T19:15:39Z

Pull driver core updates from Danilo Krummrich: "debugfs: - Remove unneeded debugfs_file_{get,put}() instances - Remove last remnants of debugfs_real_fops() - Allow storing non-const void * in struct debugfs_inode_info::aux sysfs: - Switch back to attribute_group::bin_attrs (treewide) - Switch back to bin_attribute::read()/write() (treewide) - Constify internal references to 'struct bin_attribute' Support cache-ids for device-tree systems: - Add arch hook arch_compact_of_hwid() - Use arch_compact_of_hwid() to compact MPIDR values on arm64 Rust: - Device: - Introduce CoreInternal device context (for bus internal methods) - Provide generic drvdata accessors for bus devices - Provide Driver::unbind() callbacks - Use the infrastructure above for auxiliary, PCI and platform - Implement Device::as_bound() - Rename Device::as_ref() to Device::from_raw() (treewide) - Implement fwnode and device property abstractions - Implement example usage in the Rust platform sample driver - Devres: - Remove the inner reference count (Arc) and use pin-init instead - Replace Devres::new_foreign_owned() with devres::register() - Require T to be Send in Devres - Initialize the data kept inside a Devres last - Provide an accessor for the Devres associated Device - Device ID: - Add support for ACPI device IDs and driver match tables - Split up generic device ID infrastructure - Use generic device ID infrastructure in net::phy - DMA: - Implement the dma::Device trait - Add DMA mask accessors to dma::Device - Implement dma::Device for PCI and platform devices - Use DMA masks from the DMA sample module - I/O: - Implement abstraction for resource regions (struct resource) - Implement resource-based ioremap() abstractions - Provide platform device accessors for I/O (remap) requests - Misc: - Support fallible PinInit types in Revocable - Implement Wrapper for Opaque - Merge pin-init blanket dependencies (for Devres) Misc: - Fix OF node leak in auxiliary_device_create() - Use util macros in device property iterators - Improve kobject sample code - Add device_link_test() for testing device link flags - Fix typo in Documentation/ABI/testing/sysfs-kernel-address_bits - Hint to prefer container_of_const() over container_of()" * tag 'driver-core-6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core: (84 commits) rust: io: fix broken intra-doc links to `platform::Device` rust: io: fix broken intra-doc link to missing `flags` module rust: io: mem: enable IoRequest doc-tests rust: platform: add resource accessors rust: io: mem: add a generic iomem abstraction rust: io: add resource abstraction rust: samples: dma: set DMA mask rust: platform: implement the `dma::Device` trait rust: pci: implement the `dma::Device` trait rust: dma: add DMA addressing capabilities rust: dma: implement `dma::Device` trait rust: net::phy Change module_phy_driver macro to use module_device_table macro rust: net::phy represent DeviceId as transparent wrapper over mdio_device_id rust: device_id: split out index support into a separate trait device: rust: rename Device::as_ref() to Device::from_raw() arm64: cacheinfo: Provide helper to compress MPIDR value into u32 cacheinfo: Add arch hook to compress CPU h/w id into 32 bits for cache-id cacheinfo: Set cache 'id' based on DT data container_of: Document container_of() is not to be used in new code driver core: auxiliary bus: fix OF node leak ...