src/mem/qos/policy_fixed_prio.cc

   1 /*
   2  * Copyright (c) 2018 ARM Limited
   3  * All rights reserved
   4  *
   5  * The license below extends only to copyright in the software and shall
   6  * not be construed as granting a license to any other intellectual
   7  * property including but not limited to intellectual property relating
   8  * to a hardware implementation of the functionality of the software
   9  * licensed hereunder.  You may use the software subject to the license
  10  * terms below provided that you ensure that this notice is replicated
  11  * unmodified and in its entirety in all distributions of the software,
  12  * modified or unmodified, in source code or in binary form.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions are
  16  * met: redistributions of source code must retain the above copyright
  17  * notice, this list of conditions and the following disclaimer;
  18  * redistributions in binary form must reproduce the above copyright
  19  * notice, this list of conditions and the following disclaimer in the
  20  * documentation and/or other materials provided with the distribution;
  21  * neither the name of the copyright holders nor the names of its
  22  * contributors may be used to endorse or promote products derived from
  23  * this software without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  26  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  27  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  28  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  29  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  30  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  31  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  32  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  35  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * Author: Matteo Andreozzi
  38  */
  39
  40 #include "mem/qos/policy_fixed_prio.hh"
  41
  42 #include <algorithm>
  43 #include <functional>
  44
  45 #include "mem/request.hh"
  46
  47 namespace QoS {
  48
  49 FixedPriorityPolicy::FixedPriorityPolicy(const Params &p)
  50   : Policy(p), defaultPriority(p.qos_fixed_prio_default_prio)
  51 {}
  52
  53 FixedPriorityPolicy::~FixedPriorityPolicy()
  54 {}
  55
  56 void
  57 FixedPriorityPolicy::init()
  58 {
  59 }
  60
  61 void
  62 FixedPriorityPolicy::initRequestorName(std::string requestor, uint8_t priority)
  63 {
  64     priorityMap.insert(
  65         this->pair<std::string, uint8_t>(requestor, priority));
  66 }
  67
  68 void
  69 FixedPriorityPolicy::initRequestorObj(const SimObject* requestor,
  70                                    uint8_t priority)
  71 {
  72     priorityMap.insert(
  73         this->pair<const SimObject*, uint8_t>(requestor, priority));
  74 }
  75
  76 uint8_t
  77 FixedPriorityPolicy::schedule(const RequestorID id, const uint64_t data)
  78 {
  79     // Reads a packet's RequestorID contained in its encapsulated request
  80     // if a match is found in the configured priority map, returns the
  81     // matching priority, else returns zero
  82
  83     auto ret = priorityMap.find(id);
  84
  85     if (ret != priorityMap.end()) {
  86         return ret->second;
  87     } else {
  88         DPRINTF(QOS, "Requestor %s (RequestorID %d) not present in "
  89                      "priorityMap, assigning default priority %d\n",
  90                       memCtrl->system()->getRequestorName(id),
  91                       id, defaultPriority);
  92         return defaultPriority;
  93     }
  94 }
  95
  96 } // namespace QoS