write_queue_entry.cc

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/*
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 * Copyright (c) 2002-2005 The Regents of The University of Michigan
 * Copyright (c) 2010 Advanced Micro Devices, Inc.
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 * Authors: Erik Hallnor
 *          Dave Greene
 *          Andreas Hansson
 */

#include "mem/cache/write_queue_entry.hh"

#include <cassert>
#include <string>

#include "base/logging.hh"
#include "base/types.hh"
#include "mem/cache/base.hh"
#include "mem/request.hh"

inline void
WriteQueueEntry::TargetList::add(PacketPtr pkt, Tick readyTime,
                                 Counter order)
{
    emplace_back(pkt, readyTime, order);
}

bool
WriteQueueEntry::TargetList::trySatisfyFunctional(PacketPtr pkt)
{
    for (auto& t : *this) {
        if (pkt->trySatisfyFunctional(t.pkt)) {
            return true;
        }
    }

    return false;
}

void
WriteQueueEntry::TargetList::print(std::ostream &os, int verbosity,
                                   const std::string &prefix) const
{
    for (auto& t : *this) {
        ccprintf(os, "%sFromCPU: ", prefix);
        t.pkt->print(os, verbosity, "");
    }
}

void
WriteQueueEntry::allocate(Addr blk_addr, unsigned blk_size, PacketPtr target,
                          Tick when_ready, Counter _order)
{
    blkAddr = blk_addr;
    blkSize = blk_size;
    isSecure = target->isSecure();
    readyTime = when_ready;
    order = _order;
    assert(target);
    _isUncacheable = target->req->isUncacheable();
    inService = false;

    // we should never have more than a single target for cacheable
    // writes (writebacks and clean evictions)
    panic_if(!_isUncacheable && !targets.empty(),
             "Write queue entry %#llx should never have more than one "
             "cacheable target", blkAddr);
    panic_if(!((target->isWrite() && _isUncacheable) ||
               (target->isEviction() && !_isUncacheable) ||
               target->cmd == MemCmd::WriteClean),
             "Write queue entry %#llx should be an uncacheable write or "
             "a cacheable eviction or a writeclean");

    targets.add(target, when_ready, _order);

    // All targets must refer to the same block
    assert(target->matchBlockAddr(targets.front().pkt, blkSize));
}

void
WriteQueueEntry::deallocate()
{
    assert(targets.empty());
    inService = false;
}

bool
WriteQueueEntry::trySatisfyFunctional(PacketPtr pkt)
{
    // For printing, we treat the WriteQueueEntry as a whole as single
    // entity. For other requests, we iterate over the individual
    // targets since that's where the actual data lies.
    if (pkt->isPrint()) {
        pkt->trySatisfyFunctional(this, blkAddr, isSecure, blkSize, nullptr);
        return false;
    } else {
        return targets.trySatisfyFunctional(pkt);
    }
}

bool
WriteQueueEntry::sendPacket(BaseCache &cache)
{
    return cache.sendWriteQueuePacket(this);
}

bool
WriteQueueEntry::matchBlockAddr(const Addr addr, const bool is_secure) const
{
    assert(hasTargets());
    return (blkAddr == addr) && (isSecure == is_secure);
}

bool
WriteQueueEntry::matchBlockAddr(const PacketPtr pkt) const
{
    assert(hasTargets());
    return pkt->matchBlockAddr(blkAddr, isSecure, blkSize);
}

bool
WriteQueueEntry::conflictAddr(const QueueEntry* entry) const
{
    assert(hasTargets());
    return entry->matchBlockAddr(blkAddr, isSecure);
}

void
WriteQueueEntry::print(std::ostream &os, int verbosity,
                       const std::string &prefix) const
{
    ccprintf(os, "%s[%#llx:%#llx](%s) %s %s %s state: %s %s %s %s %s\n",
             prefix, blkAddr, blkAddr + blkSize - 1,
             isSecure ? "s" : "ns",
             _isUncacheable ? "Unc" : "",
             inService ? "InSvc" : "");

    ccprintf(os, "%s  Targets:\n", prefix);
    targets.print(os, verbosity, prefix + "    ");
}

std::string
WriteQueueEntry::print() const
{
    std::ostringstream str;
    print(str);
    return str.str();
}