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################################################################################
# BSD LICENSE
#
# Copyright(c) 2019-2023 Intel Corporation. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Intel Corporation nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
################################################################################
import os
import re
import subprocess
import pexpect
RESCTRL_ROOT_PATH = "/sys/fs/resctrl"
class ResctrlSchemata:
def __init__(self, path):
self.path = path
self.data = {}
self.parse()
def parse(self):
# Open file and fill each line into a list
# pylint: disable=unspecified-encoding
with open(self.path, 'r') as schema_file:
lines = schema_file.readlines()
for line in lines:
match = re.search(r"^\s*([A-Z23]*):(.*)$", line)
if not match:
continue
label = match.group(1)
data = match.group(2).split(";")
self.data[label] = []
for mask in data:
match = re.search(r"^([0-9]*)=\s*([0-9a-f]*)$", mask)
if not match:
continue
if label == "MB":
value = int(match.group(2), 10)
else:
value = int(match.group(2), 16)
self.data[label].append(value)
def get(self, label, resource_id):
return self.data[label][resource_id]
class Resctrl:
def __init__(self):
self.root = RESCTRL_ROOT_PATH
def run_cmd(self, command):
with subprocess.Popen(command.split(), stdin=subprocess.PIPE,
stdout=subprocess.PIPE, stderr=subprocess.PIPE) as child:
(stdout, stderr) = child.communicate()
if stdout is not None:
stdout = stdout.decode("utf-8")
if stderr is not None:
stderr = stderr.decode("utf-8")
return stdout, stderr, child.returncode
def is_mounted(self):
command = "mount -t resctrl"
output, _, _ = self.run_cmd(command)
return "resctrl" in output and self.root in output and "rw" in output
def mount(self, cdp=False, cdpl2=False, mba_mbps=False):
options_str = ''
options = []
if cdp:
options.append('cdp')
if cdpl2:
options.append('cdpl2')
if mba_mbps:
options.append('mba_MBps')
if options:
options_str = ' -o ' + ','.join(options)
command = f"mount -t resctrl resctrl{options_str} {self.root}"
self.run_cmd(command)
return self.is_mounted()
def umount(self):
command = "umount -a -t resctrl"
self.run_cmd(command)
return not self.is_mounted()
def info_dir_exists(self, dir_name):
dir_path = os.path.join(self.root, "info", dir_name)
return os.path.exists(dir_path)
def get_mon_features(self):
mon_feat_path = os.path.join(self.root, "info", "L3_MON", "mon_features")
if not os.path.exists(mon_feat_path):
return []
# pylint: disable=unspecified-encoding
with open(mon_feat_path, 'r') as feat_file:
lines = feat_file.readlines()
return [line.strip() for line in lines]
def get_schemata_path(self, cos=0):
if cos == 0:
return os.path.join(self.root, "schemata")
return os.path.join(self.root, f"COS{str(cos)}", "schemata")
def get_schemata(self, cos=0):
path = self.get_schemata_path(cos)
return ResctrlSchemata(path)
@staticmethod
def get_ctrl_group_count():
ctrl_group_count = 0
command = f'bash -c "ls {RESCTRL_ROOT_PATH}"'
output, exit_code = pexpect.run(command, withexitstatus=True)
if exit_code == 0:
ctrl_group_count = 1
command = f'bash -c "ls {RESCTRL_ROOT_PATH} | grep COS | wc -l"'
output = pexpect.run(command)
ctrl_group_count += int(output)
return ctrl_group_count
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