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/*
* Copyright (c) 2018 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* 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 the copyright holders 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.
*
* Author: Matteo Andreozzi
*/
#ifndef __MEM_QOS_POLICY_HH__
#define __MEM_QOS_POLICY_HH__
#include "base/trace.hh"
#include "debug/QOS.hh"
#include "mem/qos/mem_ctrl.hh"
#include "mem/packet.hh"
#include "sim/system.hh"
namespace QoS {
/**
* QoS Policy base class
*
* QoS Policy base class: all QoS policies derive from this class to
* implement specific QoS scheduling algorithms
*
*/
class Policy : public SimObject
{
public:
using Params = QoSPolicyParams;
Policy(const Params* p);
virtual ~Policy();
virtual void regStats() override {};
virtual void init() override {};
/**
* Setting a pointer to the Memory Controller implementing
* the policy.
*/
void setMemCtrl(MemCtrl* mem) { memCtrl = mem; };
/**
* Builds a MasterID/value pair given a master input.
* This will be lookuped in the system list of masters in order
* to retrieve the associated MasterID.
* In case the master name/object cannot be resolved, the pairing
* method will panic.
*
* @param master Master to lookup in the system
* @param value Value to be associated with the MasterID
* @return A MasterID/Value pair.
*/
template <typename M, typename T>
std::pair<MasterID, T> pair(M master, T value);
/**
* Schedules data - must be defined by derived class
*
* @param mId master id to schedule
* @param data data to schedule
* @return QoS priority value
*/
virtual uint8_t schedule(const MasterID mId, const uint64_t data) = 0;
/**
* Schedules a packet. Non virtual interface for the scheduling
* method requiring a master ID.
*
* @param pkt pointer to packet to schedule
* @return QoS priority value
*/
uint8_t schedule(const PacketPtr pkt);
protected:
/** Pointer to parent memory controller implementing the policy */
MemCtrl* memCtrl;
};
template <typename M, typename T>
std::pair<MasterID, T>
Policy::pair(M master, T value)
{
auto id = memCtrl->system()->lookupMasterId(master);
panic_if(id == Request::invldMasterId,
"Unable to find master %s\n", master);
DPRINTF(QOS,
"Master %s [id %d] associated with QoS data %d\n",
master, id, value);
return std::pair<MasterID, T>(id, value);
}
} // namespace QoS
#endif /* __MEM_QOS_POLICY_HH__ */
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