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module/cpuidle: Add listing & setting governors

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Add support for listing the currently available idle governors and
setting the currently used one through sysfs.
This commit is contained in:
Kajetan Puchalski 2022-07-18 14:12:16 +01:00 committed by Marc Bonnici
parent 5042f474c2
commit ff2268b715
1 changed files with 26 additions and 0 deletions
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26
devlib/module/cpuidle.py
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@ -19,7 +19,9 @@ from operator import attrgetter
from pprint import pformat
from devlib.module import Module
from devlib.exception import TargetStableError
from devlib.utils.types import integer, boolean
from devlib.utils.misc import memoized
class CpuidleState(object):
@ -170,8 +172,32 @@ class Cpuidle(Module):
def get_driver(self):
return self.target.read_value(self.target.path.join(self.root_path, 'current_driver'))
@memoized
def list_governors(self):
"""Returns a list of supported idle governors."""
sysfile = self.target.path.join(self.root_path, 'available_governors')
output = self.target.read_value(sysfile)
return output.strip().split()
def get_governor(self):
"""Returns the currently selected idle governor."""
path = self.target.path.join(self.root_path, 'current_governor_ro')
if not self.target.file_exists(path):
path = self.target.path.join(self.root_path, 'current_governor')
return self.target.read_value(path)
def set_governor(self, governor):
"""
Set the idle governor for the system.
:param governor: The name of the governor to be used. This must be
supported by the specific device.
:raises TargetStableError if governor is not supported by the CPU, or
if, for some reason, the governor could not be set.
"""
supported = self.list_governors()
if governor not in supported:
raise TargetStableError('Governor {} not supported'.format(governor))
sysfile = self.target.path.join(self.root_path, 'current_governor')
self.target.write_value(sysfile, governor)