Changes in cppc.c

a5778046a02570fd23bdf0b48dce330237d1996c - Merge tag 'pm-7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Tue, 18 Aug 2026 17:47:09 +0200

Merge tag 'pm-7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pmPull power management updates from Rafael Wysocki: "As has been the case for quite some time, this set of changes is dominated by cpufreq updates including intel-pstate and amd-pstate driver updates, minor fixes and cleanups of other assorted cpufreq drivers, schedutil governor updates, fixes of the Rust bindings, new hardware support (IPQ5210 in qcom-nvmem), and some updates of self tests related to cpufreq. The second largest group of changes are cpuidle updates consisting of intel_idle driver updates and ACPI processor idle driver updates, both mostly related to ACPI _LPI support. There are also updates related to system sleep, mostly in the hibernation core code, two operating performance points (OPP) updates, one runtime PM framework update, one power capping update, and some tools updates including the addition of ACPI CPPC support to cpupower. Specifics: - Minor fixes and cleanups in assorted cpufreq drivers (Dan Carpenter, Guru Das Srinagesh, Haoxiang Li, Karl Mehltretter, Sasha Finkelstein, and Pan Chuang) - Fix cpufreq table creation and bios_limits() callback in the Rust bindings (Priya Bala Govindasamy) - Add IPQ5210 support to qcom-nvmem driver (Varadarajan Narayanan) - Adjust the .adjust_perf() cpufreq driver callback to allow the maximum performance value to be passed to drivers and update the intel_pstate driver to use it (Rafael Wysocki) - Set policy->cur to the actual requested frequency in the intel_pstate driver when the performance policy is used (Rafael Wysocki) - Simplify HWP handling on Broadwell processors in intel_pstate (Rafael Wysocki) - Fix setting minimum P-state at init time in intel_pstate (Rafael Wysocki) - Consolidate frequency values computation in intel_pstate and clean up code in that driver (Rafael Wysocki) - Add missing kernel-doc descriptions for structure and union members in the amd-pstate driver (David Vernet) - Handle missing policy in dynamic EPP callbacks in the amd-pstate driver (EDAMAMEX) - Introduce EXPORT_SYMBOL_FOR_PSTATE_UT() to export amd-pstate driver symbols to the amd-pstate-ut subdriver (K Prateek Nayak) - Add dynamic EPP as an "energy_performance_preference" mode in amd-pstate, remove the "amd_dynamic_epp" kernel command line option and the "dynamic_epp" sysfs attribute, and update the dynamic_epp documentation accordingly (K Prateek Nayak) - Add unit tests for CPPC Performance Priority and the "dynamic" EPP mode in the amd-pstate driver (K Prateek Nayak) - Set min_limit_freq based on bios_min_perf in amd-pstate and remove the defensive check for bios_min_perf from it (K Prateek Nayak) - Fix EPP return type and handle errors in amd-pstate during initialization, toggle auto_sel in active mode on shared memory systems, and cache the firmware programmed EPP value (Marco Scardovi) - Skip tests in amd-pstate-ut if the amd-pstate driver is not in active use (Qianheng Peng) - Replace sprintf() with sysfs_emit() in sysfs show in the cpufreq schedutil governor and fix a self-contradictory comment in sugov_iowait_apply() (Zhongqiu Han) - Fix the usage example for the sampling_rate tunable of the ondemand cpufreq governor in admin-guide (wangxiaodong) - Avoid using deep idle states during initialization in the intel_idle driver to work around device handling issues (Rafael Wysocki) - Fix and refactor the ACPI processor driver code related to ACPI _LPI support and add ACPI _LPI support to intel_idle based on that ACPI processor driver update (Rafael Wysocki) - Backup and restore governor for cpufreq sptests (Yiwei Lin) - Remove unnecessary sudo from quick_shuffle() and remove unused local variables from switch_show_governor() in cpufreq selftests (Jinseok Kim) - Rename the PM core module parameter prefix to "pm" and allow the PM transition (DPM) watchdog to be disabled by default (Tzung-Bi Shih) - Fix off-by-one in wakelocks number limit check in the system sleep sysfs interface (Haowen Tu) - Remove kernel-doc markings from helper descriptions in the core hibernation code (Adi Nata) - Use %pe to print error pointer values in the hibernation core (Ronan Marchal) - Fix memory leak in snapshot_write_next() error path (Malaya Kumar Rout) - Delay allocating and linking the next swap_map_page in the hibernation image saving code until another image page actually needs to be recorded (Haesung Kim) - Fix cleanup ordering around scope-based pointers in OPP (Gregor Herburger). - Use clk_get_optional() for optional clocks in OPP (Praveen Talari). - Stop setting runtime_error on runtime resume callback failures to allow drivers to recover from resume issues (Praveen Talari) - Handle PMU registration failure during probe in the intel_rapl_tpmi driver (Sumeet Pawnikar) - Avoid optional imports in intel_pstate_tracer unless they are really needed (Yousef Alhouseen) - Add generic CPPC performance display to the cpupower utility, build and call CPPC information on non-AMD processors, make cpupower print kernel and hardware frequency information, and add libm to cpupower for generic CPPC view (Jeremy Linton) - Remove conditional return with no effect from cpupower (Sang-Heon Jeon)"* tag 'pm-7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (76 commits) cpufreq: imx6q: fix out-of-bounds write when probed more than once cpufreq: imx6q: fix devres accumulation across driver rebind rust: cpufreq: Fix temporary write in Registration::bios_limit_callback rust: cpufreq: Add CPUFREQ_TABLE_END as last table entry in TableBuilder::to_table opp: Use clk_get_optional() to avoid leaving opp_table->clk as an error pointer intel_idle: Avoid using deep idle states during initialization cpupower: remove conditional return with no effect cpufreq: intel_pstate: Adjust policy->cur in active mode to policy cpufreq/amd-pstate: Document missing kernel-doc members cpufreq/amd-pstate-ut: Add unit test for CPPC Performance Priority cpufreq/amd-pstate-ut: Add unit test for "dynamic" EPP mode cpufreq/amd-pstate: Reduce the scope of exported symbols Documentation/amd-pstate: Update dynamic_epp documentation with new behavior cpufreq/amd-pstate: Remove "amd_dynamic_epp" cmdline and "dynamic_epp" sysfs cpufreq/amd-pstate: Add dynamic EPP as an "energy_performance_preference" mode cpufreq/amd-pstate: Extract platform profile to EPP conversion into a helper cpufreq/amd-pstate: Remove the defensive check for bios_min_perf cpufreq/amd-pstate: Set min_limit_freq based on bios_min_perf powercap: intel_rapl_tpmi: Handle PMU registration failure during probe PM: sleep: Allow disabling DPM watchdog by default ... List of files: /linux/tools/power/cpupower/utils/helpers/cppc.c

7544a367adc1ce5e9cc62315b4c32dc72b509451 - Merge branches 'pm-sleep', 'pm-runtime', 'pm-powercap' and 'pm-tools'

Fri, 07 Aug 2026 22:07:04 +0200

Merge branches 'pm-sleep', 'pm-runtime', 'pm-powercap' and 'pm-tools'Merge updates related to system sleep handling and runtime PM, a powercapping update, and power management tools updates for 7.3-rc1: - Rename the PM core module parameter prefix to "pm" and allow the PM transition (DPM) watchdog to be disabled by default (Tzung-Bi Shih) - Fix off-by-one in wakelocks number limit check in the system sleep sysfs interface (Haowen Tu) - Remove kernel-doc markings from helper descriptions in the core hibernation code (Adi Nata) - Use %pe to print error pointer values in the hibernation core (Ronan Marchal) - Fix memory leak in snapshot_write_next() error path (Malaya Kumar Rout) - Delay allocating and linking the next swap_map_page in the hibernation image saving code until another image page actually needs to be recorded (Haesung Kim) - Stop setting runtime_error on runtime resume callback failures to allow drivers to recover from resume issues (Praveen Talari) - Handle PMU registration failure during probe in the intel_rapl_tpmi driver (Sumeet Pawnikar) - Avoid optional imports in intel_pstate_tracer unless they are really needed (Yousef Alhouseen) - Add generic CPPC performance display to the cpupower utility, build and call CPPC information on non-AMD processors, make cpupower print kernel and hardware frequency information, and add libm to cpupower for generic CPPC view (Jeremy Linton) - Remove conditional return with no effect from cpupower (Sang-Heon Jeon)* pm-sleep: PM: sleep: Allow disabling DPM watchdog by default PM: sleep: Rename module parameters prefix to "pm" PM: hibernate: swap: defer linking the next map page PM: hibernate: Fix memory leak in snapshot_write_next() error path PM: hibernate: Use %pe to print error pointer values PM: hibernate: Remove kernel-doc markings from helper descriptions PM: sleep: Fix off-by-one in wakelocks number limit check* pm-runtime: PM: runtime: Only set runtime_error on suspend callback failures* pm-powercap: powercap: intel_rapl_tpmi: Handle PMU registration failure during probe* pm-tools: cpupower: remove conditional return with no effect tools/power: intel_pstate_tracer: avoid optional imports for help cpupower: Add libm to cpupower for generic CPPC view cpupower: Print kernel and hardware frequency information cpupower: Build and call CPPC information on non-AMD processors cpupower: Add generic CPPC performance display List of files: /linux/tools/power/cpupower/utils/helpers/cppc.c

f1a1cf1590a4692a29a6740d26f9e593155bac4d - Merge tag 'linux-cpupower-7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux

Wed, 05 Aug 2026 13:53:51 +0200

Merge tag 'linux-cpupower-7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linuxPull cpupower utility updates for 7.3-rc1 from Shuah Khan:"Adds support for generic CPPC display that depends only on standardized fields, improving AMD specific implementation for the same. Removes conditional return with no effect as part of tree-wide code clean up effort."* tag 'linux-cpupower-7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux: cpupower: remove conditional return with no effect cpupower: Add libm to cpupower for generic CPPC view cpupower: Print kernel and hardware frequency information cpupower: Build and call CPPC information on non-AMD processors cpupower: Add generic CPPC performance display List of files: /linux/tools/power/cpupower/utils/helpers/cppc.c

68f34fad760b68e878aced43934cc02b9d1bed89 - cpupower: Add generic CPPC performance display

Fri, 10 Jul 2026 00:13:42 +0200

cpupower: Add generic CPPC performance displayArm64 machines, and possibly others, use the standard ACPI defined CPPCinfrastructure. cpupower has CPPC support, but it's largely writtenaround the intricacies of AMD processors, using platform MSRs to avoidshortcomings in the specification.Add a generic CPPC display that depends only on standardized fields. Thecomputed frequency values are best effort and rely on the FW providingoptional values that can be used to derive a meaningful frequency at agiven unique performance level.Link: https://lore.kernel.org/r/20260709221344.1919794-2-jeremy.linton@arm.comSigned-off-by: Jeremy Linton Signed-off-by: Shuah Khan List of files: /linux/tools/power/cpupower/utils/helpers/cppc.c