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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.
################################################################################
"""
The module defines PqosCatL2 which can be used to read or write L2 CAT
configuration.
"""
from __future__ import absolute_import, division, print_function
import ctypes
from pqos.capability import PqosCap
from pqos.common import pqos_handle_error, COSBase
from pqos.native_struct import CPqosL2Ca
from pqos.pqos import Pqos
class PqosCatL2(object):
"PQoS L2 Cache Allocation Technology"
class COS(COSBase): # pylint: disable=too-few-public-methods
"L2 class of service configuration"
def __init__(self):
self.pqos = Pqos()
def set(self, l2id, coses):
"""
Sets class of service on a specified l2id.
Parameters:
l2id: L2 cache identifier
coses: a list of PqosCatL2.COS objects, class of service
configuration
"""
pqos_l2_cas = [CPqosL2Ca.from_cos(cos) for cos in coses]
pqos_l2_ca_arr = (CPqosL2Ca * len(pqos_l2_cas))(*pqos_l2_cas)
ret = self.pqos.lib.pqos_l2ca_set(l2id, len(pqos_l2_cas),
pqos_l2_ca_arr)
pqos_handle_error('pqos_l2ca_set', ret)
def get(self, l2id):
"""
Reads classes of service from a L2 ID.
Parameters:
l2id: L2 cache identifier
"""
cap = PqosCap()
cos_num = cap.get_l2ca_cos_num()
l2cas = (CPqosL2Ca * cos_num)()
num_ca = ctypes.c_uint(0)
num_ca_ref = ctypes.byref(num_ca)
ret = self.pqos.lib.pqos_l2ca_get(l2id, cos_num, num_ca_ref, l2cas)
pqos_handle_error('pqos_l2ca_get', ret)
coses = [l2ca.to_cos(self.COS) for l2ca in l2cas[:num_ca.value]]
return coses
def get_min_cbm_bits(self):
"""Gets minimum number of bits which must be set in L2 way mask when
updating a class of service."""
min_cbm_bits = ctypes.c_uint(0)
min_cbm_bits_ref = ctypes.byref(min_cbm_bits)
ret = self.pqos.lib.pqos_l2ca_get_min_cbm_bits(min_cbm_bits_ref)
pqos_handle_error('pqos_l2ca_get_min_cbm_bits', ret)
return min_cbm_bits.value
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