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https://github.com/ARM-software/workload-automation.git
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d9f45db71e
Dynamic modules may be loaded automatically on device initialization if the device supports them. Dynamic modules implent probe() method to determine whether they are supported by a particular deviced. devcpufreq and cpuidle have been converted into dynamic modules
116 lines
3.7 KiB
Python
116 lines
3.7 KiB
Python
# Copyright 2014-2015 ARM Limited
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# pylint: disable=attribute-defined-outside-init
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import wlauto.core.signal as signal
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from wlauto import Module
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from wlauto.exceptions import DeviceError
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class CpuidleState(object):
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@property
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def usage(self):
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return self.get('usage')
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@property
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def time(self):
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return self.get('time')
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@property
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def disable(self):
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return self.get('disable')
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@disable.setter
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def disable(self, value):
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self.set('disable', value)
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@property
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def ordinal(self):
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i = len(self.id)
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while self.id[i - 1].isdigit():
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i -= 1
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if not i:
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raise ValueError('invalid idle state name: "{}"'.format(self.id))
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return int(self.id[i:])
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def __init__(self, device, path):
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self.device = device
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self.path = path
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self.id = self.device.path.basename(self.path)
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self.cpu = self.device.path.basename(self.device.path.dirname(path))
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self.desc = self.get('desc')
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self.name = self.get('name')
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self.latency = self.get('latency')
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self.power = self.get('power')
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def get(self, prop):
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property_path = self.device.path.join(self.path, prop)
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return self.device.get_sysfile_value(property_path)
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def set(self, prop, value):
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property_path = self.device.path.join(self.path, prop)
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self.device.set_sysfile_value(property_path, value)
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def __eq__(self, other):
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if isinstance(other, CpuidleState):
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return (self.name == other.name) and (self.desc == other.desc)
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elif isinstance(other, basestring):
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return (self.name == other) or (self.desc == other)
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else:
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return False
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def __ne__(self, other):
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return not self.__eq__(other)
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class Cpuidle(Module):
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name = 'cpuidle'
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description = """
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Adds cpuidle state query and manupution APIs to a Device interface.
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"""
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capabilities = ['cpuidle']
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root_path = '/sys/devices/system/cpu/cpuidle'
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def probe(self, device):
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return device.file_exists(self.root_path)
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def initialize(self, context):
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self.device = self.root_owner
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signal.connect(self._on_device_init, signal.RUN_INIT, priority=1)
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def get_cpuidle_driver(self):
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return self.device.get_sysfile_value(self.device.path.join(self.root_path, 'current_driver')).strip()
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def get_cpuidle_governor(self):
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return self.device.get_sysfile_value(self.device.path.join(self.root_path, 'current_governor_ro')).strip()
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def get_cpuidle_states(self, cpu=0):
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if isinstance(cpu, int):
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cpu = 'cpu{}'.format(cpu)
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states_dir = self.device.path.join(self.device.path.dirname(self.root_path), cpu, 'cpuidle')
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idle_states = []
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for state in self.device.listdir(states_dir):
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if state.startswith('state'):
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idle_states.append(CpuidleState(self.device, self.device.path.join(states_dir, state)))
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return idle_states
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def _on_device_init(self, context): # pylint: disable=unused-argument
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if not self.device.file_exists(self.root_path):
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raise DeviceError('Device kernel does not appear to have cpuidle enabled.')
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