Source code for devlib.platform
# Copyright 2018 ARM Limited
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import logging
BIG_CPUS = ['A15', 'A57', 'A72', 'A73']
[docs]class Platform(object):
@property
def number_of_clusters(self):
return len(set(self.core_clusters))
def __init__(self,
name=None,
core_names=None,
core_clusters=None,
big_core=None,
model=None,
modules=None,
):
self.name = name
self.core_names = core_names or []
self.core_clusters = core_clusters or []
self.big_core = big_core
self.little_core = None
self.model = model
self.modules = modules or []
self.logger = logging.getLogger(self.name)
if not self.core_clusters and self.core_names:
self._set_core_clusters_from_core_names()
def init_target_connection(self, target):
# May be ovewritten by subclasses to provide target-specific
# connection initialisation.
pass
def update_from_target(self, target):
if not self.core_names:
self.core_names = target.cpuinfo.cpu_names
self._set_core_clusters_from_core_names()
if not self.big_core and self.number_of_clusters == 2:
self.big_core = self._identify_big_core()
if not self.core_clusters and self.core_names:
self._set_core_clusters_from_core_names()
if not self.model:
self._set_model_from_target(target)
if not self.name:
self.name = self.model
self._validate()
def setup(self, target):
# May be overwritten by subclasses to provide platform-specific
# setup procedures.
pass
def _set_core_clusters_from_core_names(self):
self.core_clusters = []
clusters = []
for cn in self.core_names:
if cn not in clusters:
clusters.append(cn)
self.core_clusters.append(clusters.index(cn))
def _set_model_from_target(self, target):
if target.os == 'android':
try:
self.model = target.getprop(prop='ro.product.device')
except KeyError:
self.model = target.getprop('ro.product.model')
elif target.file_exists("/proc/device-tree/model"):
# There is currently no better way to do this cross platform.
# ARM does not have dmidecode
raw_model = target.execute("cat /proc/device-tree/model")
device_model_to_return = '_'.join(raw_model.split()[:2])
return device_model_to_return.rstrip(' \t\r\n\0')
elif target.is_rooted:
try:
self.model = target.execute('dmidecode -s system-version',
as_root=True).strip()
except Exception: # pylint: disable=broad-except
pass # this is best-effort
def _identify_big_core(self):
for core in self.core_names:
if core.upper() in BIG_CPUS:
return core
big_idx = self.core_clusters.index(max(self.core_clusters))
return self.core_names[big_idx]
def _validate(self):
if len(self.core_names) != len(self.core_clusters):
raise ValueError('core_names and core_clusters are of different lengths.')
if self.big_core and self.number_of_clusters != 2:
raise ValueError('attempting to set big_core on non-big.LITTLE device. '
'(number of clusters is not 2)')
if self.big_core and self.big_core not in self.core_names:
message = 'Invalid big_core value "{}"; must be in [{}]'
raise ValueError(message.format(self.big_core,
', '.join(set(self.core_names))))
if self.big_core:
for core in self.core_names:
if core != self.big_core:
self.little_core = core
break