1/* 2 * Copyright (c) 2012-2013, 2015 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 --- 83 unchanged lines hidden (view full) --- 92 */ 93 enum BlockedCause { 94 Blocked_NoMSHRs = MSHRQueue_MSHRs, 95 Blocked_NoWBBuffers = MSHRQueue_WriteBuffer, 96 Blocked_NoTargets, 97 NUM_BLOCKED_CAUSES 98 }; 99 |
100 protected: 101 102 /** 103 * A cache master port is used for the memory-side port of the 104 * cache, and in addition to the basic timing port that only sends 105 * response packets through a transmit list, it also offers the 106 * ability to schedule and send request packets (requests & |
107 * writebacks). The send event is scheduled through schedSendEvent, |
108 * and the sendDeferredPacket of the timing port is modified to 109 * consider both the transmit list and the requests from the MSHR. 110 */ 111 class CacheMasterPort : public QueuedMasterPort 112 { 113 114 public: 115 116 /** 117 * Schedule a send of a request packet (from the MSHR). Note 118 * that we could already have a retry outstanding. 119 */ |
120 void schedSendEvent(Tick time) |
121 { |
122 DPRINTF(CachePort, "Scheduling send event at %llu\n", time); |
123 reqQueue.schedSendEvent(time); 124 } 125 126 protected: 127 128 CacheMasterPort(const std::string &_name, BaseCache *_cache, 129 ReqPacketQueue &_reqQueue, 130 SnoopRespPacketQueue &_snoopRespQueue) : --- 66 unchanged lines hidden (view full) --- 197 * event to the queued port to go and ask the MSHR and write queue 198 * if they have packets to send. 199 * 200 * allocateBufferInternal() function is called in: 201 * - MSHR allocateWriteBuffer (unchached write forwarded to WriteBuffer); 202 * - MSHR allocateMissBuffer (miss in MSHR queue); 203 */ 204 MSHR *allocateBufferInternal(MSHRQueue *mq, Addr addr, int size, |
205 PacketPtr pkt, Tick time, 206 bool sched_send) |
207 { 208 // check that the address is block aligned since we rely on 209 // this in a number of places when checking for matches and 210 // overlap 211 assert(addr == blockAlign(addr)); 212 213 MSHR *mshr = mq->allocate(addr, size, pkt, time, order++); 214 215 if (mq->isFull()) { 216 setBlocked((BlockedCause)mq->index); 217 } 218 |
219 if (sched_send) 220 // schedule the send 221 schedMemSideSendEvent(time); |
222 223 return mshr; 224 } 225 226 void markInServiceInternal(MSHR *mshr, bool pending_dirty_resp) 227 { 228 MSHRQueue *mq = mshr->queue; 229 bool wasFull = mq->isFull(); --- 265 unchanged lines hidden (view full) --- 495 } 496 497 498 Addr blockAlign(Addr addr) const { return (addr & ~(Addr(blkSize - 1))); } 499 500 501 const AddrRangeList &getAddrRanges() const { return addrRanges; } 502 |
503 MSHR *allocateMissBuffer(PacketPtr pkt, Tick time, bool sched_send = true) |
504 { 505 return allocateBufferInternal(&mshrQueue, 506 blockAlign(pkt->getAddr()), blkSize, |
507 pkt, time, sched_send); |
508 } 509 |
510 MSHR *allocateWriteBuffer(PacketPtr pkt, Tick time) |
511 { 512 // should only see clean evictions in a read-only cache 513 assert(!isReadOnly || pkt->cmd == MemCmd::CleanEvict); 514 assert(pkt->isWrite() && !pkt->isRead()); 515 return allocateBufferInternal(&writeBuffer, 516 blockAlign(pkt->getAddr()), blkSize, |
517 pkt, time, true); |
518 } 519 520 /** 521 * Returns true if the cache is blocked for accesses. 522 */ 523 bool isBlocked() const 524 { 525 return blocked != 0; --- 30 unchanged lines hidden (view full) --- 556 DPRINTF(Cache,"Unblocking for cause %d, mask=%d\n", cause, blocked); 557 if (blocked == 0) { 558 blocked_cycles[cause] += curCycle() - blockedCycle; 559 cpuSidePort->clearBlocked(); 560 } 561 } 562 563 /** |
564 * Schedule a send event for the memory-side port. If already 565 * scheduled, this may reschedule the event at an earlier 566 * time. When the specified time is reached, the port is free to 567 * send either a response, a request, or a prefetch request. 568 * 569 * @param time The time when to attempt sending a packet. |
570 */ |
571 void schedMemSideSendEvent(Tick time) |
572 { |
573 memSidePort->schedSendEvent(time); |
574 } 575 |
576 virtual bool inCache(Addr addr, bool is_secure) const = 0; 577 578 virtual bool inMissQueue(Addr addr, bool is_secure) const = 0; 579 580 void incMissCount(PacketPtr pkt) 581 { 582 assert(pkt->req->masterId() < system->maxMasters()); 583 misses[pkt->cmdToIndex()][pkt->req->masterId()]++; --- 17 unchanged lines hidden --- |