# Copyright (c) 2018 ARM Limited
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#
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# to a hardware implementation of the functionality of the software
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# 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
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# neither the name of the copyright holders nor the names of its
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# this software without specific prior written permission.
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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from six import string_types

from m5.SimObject import *
from m5.params import *

# QoS scheduler policy used to serve incoming transaction
class QoSPolicy(SimObject):
    type = 'QoSPolicy'
    abstract = True
    cxx_header = "mem/qos/policy.hh"
    cxx_class = 'QoS::Policy'

class QoSFixedPriorityPolicy(QoSPolicy):
    type = 'QoSFixedPriorityPolicy'
    cxx_header = "mem/qos/policy_fixed_prio.hh"
    cxx_class = 'QoS::FixedPriorityPolicy'

    cxx_exports = [
        PyBindMethod('initRequestorName'),
        PyBindMethod('initRequestorObj'),
    ]

    _requestor_priorities = None

    def setRequestorPriority(self, request_port, priority):
        if not self._requestor_priorities:
            self._requestor_priorities = []

        self._requestor_priorities.append([request_port, priority])

    def setMasterPriority(self, request_port, priority):
        warn('QosFixedPriority.setMasterPriority is deprecated in favor of '
            'setRequestorPriority. See src/mem/qos/QoSPolicy.py for more '
            'information')
        self.setRequestorPriority(request_port, priority)

    def init(self):
        if not self._requestor_priorities:
            print("Error,"
                 "use setRequestorPriority to init requestors/priorities\n");
            exit(1)
        else:
            for prio in self._requestor_priorities:
                request_port = prio[0]
                priority = prio[1]
                if isinstance(request_port, string_types):
                    self.getCCObject().initRequestorName(
                        request_port, int(priority))
                else:
                    self.getCCObject().initRequestorObj(
                        request_port.getCCObject(), priority)

    # default fixed priority value for non-listed Requestors
    qos_fixed_prio_default_prio = Param.UInt8(0,
        "Default priority for non-listed Requestors")

class QoSPropFairPolicy(QoSPolicy):
    type = 'QoSPropFairPolicy'
    cxx_header = "mem/qos/policy_pf.hh"
    cxx_class = 'QoS::PropFairPolicy'

    cxx_exports = [
        PyBindMethod('initRequestorName'),
        PyBindMethod('initRequestorObj'),
    ]

    _requestor_scores = None

    def setInitialScore(self, request_port, score):
        if not self._requestor_scores:
            self._requestor_scores = []

        self._requestor_scores.append([request_port, score])

    def init(self):
        if not self._requestor_scores:
            print("Error, use setInitialScore to init requestors/scores\n");
            exit(1)
        else:
            for prio in self._requestor_scores:
                request_port = prio[0]
                score = prio[1]
                if isinstance(request_port, string_types):
                    self.getCCObject().initRequestorName(
                        request_port, float(score))
                else:
                    self.getCCObject().initRequestorObj(
                        request_port.getCCObject(), float(score))

    weight = Param.Float(0.5, "Pf score weight")