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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 argparse
from pqos import Pqos
from pqos.cpuinfo import PqosCpuInfo
from pqos.l2ca import PqosCatL2
def str_to_int(num_str):
"""
Converts string into number.
Parameters:
num_str: a string to be converted into number
Returns:
numeric value of the string representing the number
"""
if num_str.lower().startswith('0x'):
return int(num_str[2:], 16)
return int(num_str)
# /**
# * @brief Verifies and translates definition of single
# * allocation class of service
# * from args into internal configuration.
# *
# * @param argc Number of arguments in input command
# * @param argv Input arguments for COS allocation
# */
def set_allocation_class(l2_ids, class_id, mask):
"""
Sets up allocation classes of service on selected CPU sockets
Parameters:
l2_ids: a list of L2 IDs
class_id: class of service ID
mask: COS bitmask
"""
l2ca = PqosCatL2()
cos = l2ca.COS(class_id, mask)
for l2_id in l2_ids:
try:
l2ca.set(l2_id, [cos])
except:
print("Setting up cache allocation class of service failed!")
def print_allocation_config(l2_ids):
"""
Prints allocation configuration.
Parameters:
l2_ids: a list of L2 IDs
"""
l2ca = PqosCatL2()
for l2_id in l2_ids:
try:
coses = l2ca.get(l2_id)
print("L2CA COS definitions for L2 ID %u:" % l2_id)
for cos in coses:
cos_params = (cos.class_id, cos.mask)
print(" L2CA COS%u => MASK 0x%x" % cos_params)
except:
print("Error")
raise
def parse_args():
"""
Parses command line arguments.
Returns:
an object with parsed command line arguments
"""
def int_dec_or_hex(num):
try:
return str_to_int(num)
except:
msg = 'Cannot convert a parameter to a number'
raise argparse.ArgumentError(msg)
description = 'PQoS Library Python wrapper - L2 CAT allocation example'
parser = argparse.ArgumentParser(description=description)
parser.add_argument('-I', dest='interface', action='store_const',
const='OS', default='MSR',
help='select library OS interface')
parser.add_argument('class_id', type=int, help='COS ID')
parser.add_argument('mask', type=int_dec_or_hex, help='COS bitmask')
args = parser.parse_args()
return args
class PqosContextManager:
"""
Helper class for using PQoS library Python wrapper as a context manager
(in a with statement).
"""
def __init__(self, *args, **kwargs):
self.args = args
self.kwargs = kwargs
self.pqos = Pqos()
def __enter__(self):
"Initializes PQoS library."
self.pqos.init(*self.args, **self.kwargs)
return self.pqos
def __exit__(self, *args, **kwargs):
"Finalizes PQoS library."
self.pqos.fini()
return None
def main():
args = parse_args()
try:
with PqosContextManager(args.interface):
cpu = PqosCpuInfo()
l2_ids = cpu.get_l2ids()
set_allocation_class(l2_ids, args.class_id, args.mask)
print_allocation_config(l2_ids)
except:
print("Error!")
raise
if __name__ == "__main__":
main()
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