kernel/Documentation/admin-guide/pm/amd-pstate.rst, branch linux-rolling-stable

Documentation: amd-pstate:fix minimum performance state label error

2025-07-16T19:55:58Z

In the AMD P-States Performance Scale diagram, the labels for "Max Perf" and "Lowest Perf" were incorrectly used to define the range for "Desired Perf".The "Desired performance target" should be bounded by the "Maximum requested performance" and the "Minimum requested performance", which corresponds to "Max Perf" and "Min Perf", respectively. Signed-off-by: Shouye Liu Reviewed-by: Mario Limonciello Link: https://lore.kernel.org/r/20250522070140.17557-1-shouyeliu@gmail.com Signed-off-by: Mario Limonciello

cpufreq/amd-pstate: Store the boost numerator as highest perf again

2024-12-10T16:17:43Z

commit ad4caad58d91d ("cpufreq: amd-pstate: Merge amd_pstate_highest_perf_set() into amd_get_boost_ratio_numerator()") changed the semantics for highest perf and commit 18d9b52271213 ("cpufreq/amd-pstate: Use nominal perf for limits when boost is disabled") worked around those semantic changes. This however is a confusing result and furthermore makes it awkward to change frequency limits and boost due to the scaling differences. Restore the boost numerator to highest perf again. Suggested-by: Dhananjay Ugwekar Reviewed-by: Gautham R. Shenoy Fixes: ad4caad58d91 ("cpufreq: amd-pstate: Merge amd_pstate_highest_perf_set() into amd_get_boost_ratio_numerator()") Link: https://lore.kernel.org/r/20241209185248.16301-2-mario.limonciello@amd.com Signed-off-by: Mario Limonciello

amd-pstate: Add missing documentation for `amd_pstate_prefcore_ranking`

2024-09-11T15:23:23Z

`amd_pstate_prefcore_ranking` reflects the dynamic rankings of a CPU core based on platform conditions. Explicitly include it in the documentation. Reviewed-by: Gautham R. Shenoy Signed-off-by: Mario Limonciello

cpufreq: amd-pstate: Add documentation for `amd_pstate_hw_prefcore`

2024-09-11T15:23:23Z

Explain that the sysfs file represents both preferred core being enabled by the user and supported by the hardware. Reviewed-by: Gautham R. Shenoy Signed-off-by: Mario Limonciello

cpufreq: amd-pstate: Merge amd_pstate_highest_perf_set() into amd_get_boost_ratio_numerator()

2024-09-11T15:23:23Z

The special case in amd_pstate_highest_perf_set() is the value used for calculating the boost numerator. Merge this into amd_get_boost_ratio_numerator() and then use that to calculate boost ratio. This allows dropping more special casing of the highest perf value. Reviewed-by: Gautham R. Shenoy Signed-off-by: Mario Limonciello

Documentation: cpufreq: amd-pstate: update doc for Per CPU boost control method

2024-06-26T20:48:21Z

Updates the documentation in `amd-pstate.rst` to include information about the per CPU boost control feature. Users can now enable or disable the Core Performance Boost (CPB) feature on individual CPUs using the `boost` sysfs attribute. Reviewed-by: Gautham R. Shenoy Signed-off-by: Perry Yuan Co-developed-by: Mario Limonciello Link: https://lore.kernel.org/r/20240626042733.3747-5-mario.limonciello@amd.com Signed-off-by: Mario Limonciello

Documentation: PM: amd-pstate: add guided mode to the Operation mode

2024-06-21T02:52:05Z

the guided mode is also supported, so the operation mode should include that mode as well. Reviewed-by: Mario Limonciello Signed-off-by: Perry Yuan Reviewed-by: Gautham R. Shenoy Link: https://lore.kernel.org/r/a61d825ef71f6aacc8f1624fe9fb982b8446b5a7.1718811234.git.perry.yuan@amd.com Signed-off-by: Mario Limonciello

Documentation: PM: amd-pstate: Fix section title underline

2024-02-12T13:40:32Z

Title under line too short Signed-off-by: Meng Li [ rjw: Subject edits ] Signed-off-by: Rafael J. Wysocki

Documentation: amd-pstate: introduce amd-pstate preferred core

2024-01-31T13:54:50Z

Introduce amd-pstate preferred core. check preferred core state set by the kernel parameter: $ cat /sys/devices/system/cpu/amd-pstate/prefcore Tested-by: Oleksandr Natalenko Reviewed-by: Wyes Karny Reviewed-by: Mario Limonciello Reviewed-by: Huang Rui Reviewed-by: Perry Yuan Signed-off-by: Meng Li Signed-off-by: Rafael J. Wysocki

Documentation: admin-guide: PM: Fix two typos

2024-01-10T14:10:44Z

Fix two typos in the admin-guide: - a missing e in "reference_perf" in cppc_sysfs.rst. - the amd_pstate sysfs path uses a dash instead of an underscore. Signed-off-by: Erwan Velu [ rjw: Subject and changelog edits ] Signed-off-by: Rafael J. Wysocki