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| author | Sumit Gupta <sumitg@nvidia.com> | 2026-02-06 17:26:58 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2026-02-27 22:50:42 +0300 |
| commit | 856250ba2e810e772dc95b3234ebf0d6393a51d9 (patch) | |
| tree | d9449937f915f35da8bb15ce7089d5d650c25643 | |
| parent | 13c45a26635fa51a68911aa57e6778bdad18b103 (diff) | |
| download | linux-856250ba2e810e772dc95b3234ebf0d6393a51d9.tar.xz | |
cpufreq: CPPC: Add sysfs documentation for perf_limited
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>
| -rw-r--r-- | Documentation/ABI/testing/sysfs-devices-system-cpu | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu index 3a05604c21bf..82d10d556cc8 100644 --- a/Documentation/ABI/testing/sysfs-devices-system-cpu +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu @@ -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 |