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cpufreq: CPPC: Add sysfs documentation for perf_limited

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Add ABI documentation for the Performance Limited Register sysfs
interface in the cppc_cpufreq driver.

Signed-off-by: Sumit Gupta <sumitg@nvidia.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Pierre Gondois <pierre.gondois@arm.com>
Reviewed-by: Lifeng Zheng <zhenglifeng1@huawei.com>
Link: https://patch.msgid.link/20260206142658.72583-8-sumitg@nvidia.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Sumit Gupta
2026-02-06 19:56:58 +05:30
committed by Rafael J. Wysocki
parent 13c45a2663
commit 856250ba2e
1 changed files with 18 additions and 0 deletions
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18
Documentation/ABI/testing/sysfs-devices-system-cpu
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@@ -327,6 +327,24 @@ Description: Energy performance preference
This file is only present if the cppc-cpufreq driver is in use.
What: /sys/devices/system/cpu/cpuX/cpufreq/perf_limited
Date: February 2026
Contact: linux-pm@vger.kernel.org
Description: Performance Limited
Read to check if platform throttling (thermal/power/current
limits) caused delivered performance to fall below the
requested level. A non-zero value indicates throttling occurred.
Write the bitmask of bits to clear:
- 0x1 = clear bit 0 (desired performance excursion)
- 0x2 = clear bit 1 (minimum performance excursion)
- 0x3 = clear both bits
The platform sets these bits; OSPM can only clear them.
This file is only present if the cppc-cpufreq driver is in use.
What: /sys/devices/system/cpu/cpu*/cache/index3/cache_disable_{0,1}
Date: August 2008