765 lines
22 KiB
C++
765 lines
22 KiB
C++
/*
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* Copyright (c) 2008 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Ali Saidi
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*/
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/* @file
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* Device model for Intel's I/O AT DMA copy engine.
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*/
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#include <algorithm>
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#include "base/cp_annotate.hh"
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#include "base/trace.hh"
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#include "dev/copy_engine.hh"
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#include "mem/packet.hh"
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#include "mem/packet_access.hh"
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#include "params/CopyEngine.hh"
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#include "sim/stats.hh"
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#include "sim/system.hh"
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using namespace CopyEngineReg;
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using namespace std;
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CopyEngine::CopyEngine(const Params *p)
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: PciDev(p)
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{
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// All Reg regs are initialized to 0 by default
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regs.chanCount = p->ChanCnt;
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regs.xferCap = findMsbSet(p->XferCap);
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regs.attnStatus = 0;
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if (regs.chanCount > 64)
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fatal("CopyEngine interface doesn't support more than 64 DMA engines\n");
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for (int x = 0; x < regs.chanCount; x++) {
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CopyEngineChannel *ch = new CopyEngineChannel(this, x);
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chan.push_back(ch);
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}
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}
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CopyEngine::CopyEngineChannel::CopyEngineChannel(CopyEngine *_ce, int cid)
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: ce(_ce), channelId(cid), busy(false), underReset(false),
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refreshNext(false), latBeforeBegin(ce->params()->latBeforeBegin),
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latAfterCompletion(ce->params()->latAfterCompletion),
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completionDataReg(0), nextState(Idle), drainEvent(NULL),
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fetchCompleteEvent(this), addrCompleteEvent(this),
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readCompleteEvent(this), writeCompleteEvent(this),
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statusCompleteEvent(this)
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{
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cr.status.dma_transfer_status(3);
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cr.descChainAddr = 0;
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cr.completionAddr = 0;
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curDmaDesc = new DmaDesc;
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memset(curDmaDesc, 0, sizeof(DmaDesc));
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copyBuffer = new uint8_t[ce->params()->XferCap];
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}
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CopyEngine::~CopyEngine()
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{
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for (int x = 0; x < chan.size(); x++) {
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delete chan[x];
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}
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}
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CopyEngine::CopyEngineChannel::~CopyEngineChannel()
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{
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delete curDmaDesc;
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delete [] copyBuffer;
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delete cePort;
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}
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void
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CopyEngine::init()
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{
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PciDev::init();
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for (int x = 0; x < chan.size(); x++)
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chan[x]->init();
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}
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void
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CopyEngine::CopyEngineChannel::init()
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{
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Port *peer;
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cePort = new DmaPort(ce, ce->sys, ce->params()->min_backoff_delay,
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ce->params()->max_backoff_delay);
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peer = ce->dmaPort->getPeer()->getOwner()->getPort("");
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peer->setPeer(cePort);
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cePort->setPeer(peer);
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}
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void
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CopyEngine::CopyEngineChannel::recvCommand()
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{
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if (cr.command.start_dma()) {
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assert(!busy);
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cr.status.dma_transfer_status(0);
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nextState = DescriptorFetch;
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fetchAddress = cr.descChainAddr;
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if (ce->getState() == SimObject::Running)
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fetchDescriptor(cr.descChainAddr);
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} else if (cr.command.append_dma()) {
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if (!busy) {
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nextState = AddressFetch;
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if (ce->getState() == SimObject::Running)
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fetchNextAddr(lastDescriptorAddr);
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} else
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refreshNext = true;
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} else if (cr.command.reset_dma()) {
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if (busy)
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underReset = true;
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else {
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cr.status.dma_transfer_status(3);
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nextState = Idle;
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}
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} else if (cr.command.resume_dma() || cr.command.abort_dma() ||
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cr.command.suspend_dma())
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panic("Resume, Abort, and Suspend are not supported\n");
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cr.command(0);
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}
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Tick
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CopyEngine::read(PacketPtr pkt)
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{
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int bar;
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Addr daddr;
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if (!getBAR(pkt->getAddr(), bar, daddr))
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panic("Invalid PCI memory access to unmapped memory.\n");
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// Only Memory register BAR is allowed
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assert(bar == 0);
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int size = pkt->getSize();
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if (size != sizeof(uint64_t) && size != sizeof(uint32_t) &&
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size != sizeof(uint16_t) && size != sizeof(uint8_t)) {
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panic("Unknown size for MMIO access: %d\n", pkt->getSize());
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}
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DPRINTF(DMACopyEngine, "Read device register %#X size: %d\n", daddr, size);
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pkt->allocate();
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///
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/// Handle read of register here
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///
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if (daddr < 0x80) {
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switch (daddr) {
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case GEN_CHANCOUNT:
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assert(size == sizeof(regs.chanCount));
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pkt->set<uint8_t>(regs.chanCount);
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break;
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case GEN_XFERCAP:
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assert(size == sizeof(regs.xferCap));
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pkt->set<uint8_t>(regs.xferCap);
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break;
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case GEN_INTRCTRL:
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assert(size == sizeof(uint8_t));
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pkt->set<uint8_t>(regs.intrctrl());
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regs.intrctrl.master_int_enable(0);
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break;
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case GEN_ATTNSTATUS:
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assert(size == sizeof(regs.attnStatus));
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pkt->set<uint32_t>(regs.attnStatus);
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regs.attnStatus = 0;
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break;
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default:
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panic("Read request to unknown register number: %#x\n", daddr);
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}
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pkt->makeAtomicResponse();
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return pioDelay;
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}
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// Find which channel we're accessing
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int chanid = 0;
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daddr -= 0x80;
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while (daddr >= 0x80) {
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chanid++;
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daddr -= 0x80;
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}
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if (chanid >= regs.chanCount)
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panic("Access to channel %d (device only configured for %d channels)",
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chanid, regs.chanCount);
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///
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/// Channel registers are handled here
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///
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chan[chanid]->channelRead(pkt, daddr, size);
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pkt->makeAtomicResponse();
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return pioDelay;
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}
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void
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CopyEngine::CopyEngineChannel::channelRead(Packet *pkt, Addr daddr, int size)
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{
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switch (daddr) {
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case CHAN_CONTROL:
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assert(size == sizeof(uint16_t));
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pkt->set<uint16_t>(cr.ctrl());
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cr.ctrl.in_use(1);
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break;
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case CHAN_STATUS:
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assert(size == sizeof(uint64_t));
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pkt->set<uint64_t>(cr.status() | ~busy);
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break;
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case CHAN_CHAINADDR:
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assert(size == sizeof(uint64_t) || size == sizeof(uint32_t));
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if (size == sizeof(uint64_t))
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pkt->set<uint64_t>(cr.descChainAddr);
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else
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pkt->set<uint32_t>(bits(cr.descChainAddr,0,31));
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break;
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case CHAN_CHAINADDR_HIGH:
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assert(size == sizeof(uint32_t));
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pkt->set<uint32_t>(bits(cr.descChainAddr,32,63));
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break;
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case CHAN_COMMAND:
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assert(size == sizeof(uint8_t));
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pkt->set<uint32_t>(cr.command());
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break;
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case CHAN_CMPLNADDR:
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assert(size == sizeof(uint64_t) || size == sizeof(uint32_t));
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if (size == sizeof(uint64_t))
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pkt->set<uint64_t>(cr.completionAddr);
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else
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pkt->set<uint32_t>(bits(cr.completionAddr,0,31));
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break;
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case CHAN_CMPLNADDR_HIGH:
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assert(size == sizeof(uint32_t));
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pkt->set<uint32_t>(bits(cr.completionAddr,32,63));
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break;
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case CHAN_ERROR:
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assert(size == sizeof(uint32_t));
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pkt->set<uint32_t>(cr.error());
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break;
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default:
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panic("Read request to unknown channel register number: (%d)%#x\n",
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channelId, daddr);
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}
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}
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Tick
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CopyEngine::write(PacketPtr pkt)
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{
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int bar;
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Addr daddr;
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if (!getBAR(pkt->getAddr(), bar, daddr))
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panic("Invalid PCI memory access to unmapped memory.\n");
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// Only Memory register BAR is allowed
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assert(bar == 0);
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int size = pkt->getSize();
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///
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/// Handle write of register here
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///
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if (size == sizeof(uint64_t)) {
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uint64_t val M5_VAR_USED = pkt->get<uint64_t>();
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DPRINTF(DMACopyEngine, "Wrote device register %#X value %#X\n", daddr, val);
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} else if (size == sizeof(uint32_t)) {
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uint32_t val M5_VAR_USED = pkt->get<uint32_t>();
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DPRINTF(DMACopyEngine, "Wrote device register %#X value %#X\n", daddr, val);
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} else if (size == sizeof(uint16_t)) {
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uint16_t val M5_VAR_USED = pkt->get<uint16_t>();
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DPRINTF(DMACopyEngine, "Wrote device register %#X value %#X\n", daddr, val);
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} else if (size == sizeof(uint8_t)) {
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uint8_t val M5_VAR_USED = pkt->get<uint8_t>();
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DPRINTF(DMACopyEngine, "Wrote device register %#X value %#X\n", daddr, val);
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} else {
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panic("Unknown size for MMIO access: %d\n", size);
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}
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if (daddr < 0x80) {
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switch (daddr) {
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case GEN_CHANCOUNT:
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case GEN_XFERCAP:
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case GEN_ATTNSTATUS:
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DPRINTF(DMACopyEngine, "Warning, ignorning write to register %x\n",
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daddr);
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break;
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case GEN_INTRCTRL:
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regs.intrctrl.master_int_enable(bits(pkt->get<uint8_t>(),0,1));
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break;
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default:
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panic("Read request to unknown register number: %#x\n", daddr);
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}
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pkt->makeAtomicResponse();
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return pioDelay;
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}
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// Find which channel we're accessing
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int chanid = 0;
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daddr -= 0x80;
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while (daddr >= 0x80) {
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chanid++;
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daddr -= 0x80;
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}
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if (chanid >= regs.chanCount)
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panic("Access to channel %d (device only configured for %d channels)",
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chanid, regs.chanCount);
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///
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/// Channel registers are handled here
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///
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chan[chanid]->channelWrite(pkt, daddr, size);
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pkt->makeAtomicResponse();
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return pioDelay;
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}
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void
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CopyEngine::CopyEngineChannel::channelWrite(Packet *pkt, Addr daddr, int size)
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{
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switch (daddr) {
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case CHAN_CONTROL:
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assert(size == sizeof(uint16_t));
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int old_int_disable;
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old_int_disable = cr.ctrl.interrupt_disable();
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cr.ctrl(pkt->get<uint16_t>());
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if (cr.ctrl.interrupt_disable())
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cr.ctrl.interrupt_disable(0);
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else
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cr.ctrl.interrupt_disable(old_int_disable);
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break;
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case CHAN_STATUS:
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assert(size == sizeof(uint64_t));
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DPRINTF(DMACopyEngine, "Warning, ignorning write to register %x\n",
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daddr);
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break;
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case CHAN_CHAINADDR:
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assert(size == sizeof(uint64_t) || size == sizeof(uint32_t));
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if (size == sizeof(uint64_t))
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cr.descChainAddr = pkt->get<uint64_t>();
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else
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cr.descChainAddr = (uint64_t)pkt->get<uint32_t>() |
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(cr.descChainAddr & ~mask(32));
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DPRINTF(DMACopyEngine, "Chain Address %x\n", cr.descChainAddr);
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break;
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case CHAN_CHAINADDR_HIGH:
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assert(size == sizeof(uint32_t));
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cr.descChainAddr = ((uint64_t)pkt->get<uint32_t>() <<32) |
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(cr.descChainAddr & mask(32));
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DPRINTF(DMACopyEngine, "Chain Address %x\n", cr.descChainAddr);
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break;
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case CHAN_COMMAND:
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assert(size == sizeof(uint8_t));
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cr.command(pkt->get<uint8_t>());
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recvCommand();
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break;
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case CHAN_CMPLNADDR:
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assert(size == sizeof(uint64_t) || size == sizeof(uint32_t));
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if (size == sizeof(uint64_t))
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cr.completionAddr = pkt->get<uint64_t>();
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else
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cr.completionAddr = pkt->get<uint32_t>() |
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(cr.completionAddr & ~mask(32));
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break;
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case CHAN_CMPLNADDR_HIGH:
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assert(size == sizeof(uint32_t));
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cr.completionAddr = ((uint64_t)pkt->get<uint32_t>() <<32) |
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(cr.completionAddr & mask(32));
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break;
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case CHAN_ERROR:
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assert(size == sizeof(uint32_t));
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cr.error(~pkt->get<uint32_t>() & cr.error());
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break;
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default:
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panic("Read request to unknown channel register number: (%d)%#x\n",
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channelId, daddr);
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}
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}
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void
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CopyEngine::regStats()
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{
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using namespace Stats;
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bytesCopied
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.init(regs.chanCount)
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.name(name() + ".bytes_copied")
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.desc("Number of bytes copied by each engine")
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.flags(total)
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;
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copiesProcessed
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.init(regs.chanCount)
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.name(name() + ".copies_processed")
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.desc("Number of copies processed by each engine")
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.flags(total)
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;
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}
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void
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CopyEngine::CopyEngineChannel::fetchDescriptor(Addr address)
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{
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anDq();
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anBegin("FetchDescriptor");
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DPRINTF(DMACopyEngine, "Reading descriptor from at memory location %#x(%#x)\n",
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address, ce->platform->pciToDma(address));
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assert(address);
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busy = true;
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DPRINTF(DMACopyEngine, "dmaAction: %#x, %d bytes, to addr %#x\n",
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ce->platform->pciToDma(address), sizeof(DmaDesc), curDmaDesc);
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cePort->dmaAction(MemCmd::ReadReq, ce->platform->pciToDma(address),
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sizeof(DmaDesc), &fetchCompleteEvent, (uint8_t*)curDmaDesc,
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latBeforeBegin);
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lastDescriptorAddr = address;
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}
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void
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CopyEngine::CopyEngineChannel::fetchDescComplete()
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{
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DPRINTF(DMACopyEngine, "Read of descriptor complete\n");
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if ((curDmaDesc->command & DESC_CTRL_NULL)) {
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DPRINTF(DMACopyEngine, "Got NULL descriptor, skipping\n");
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assert(!(curDmaDesc->command & DESC_CTRL_CP_STS));
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if (curDmaDesc->command & DESC_CTRL_CP_STS) {
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panic("Shouldn't be able to get here\n");
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nextState = CompletionWrite;
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if (inDrain()) return;
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writeCompletionStatus();
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} else {
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anBegin("Idle");
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anWait();
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busy = false;
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nextState = Idle;
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inDrain();
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}
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return;
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}
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if (curDmaDesc->command & ~DESC_CTRL_CP_STS)
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panic("Descriptor has flag other that completion status set\n");
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nextState = DMARead;
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if (inDrain()) return;
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readCopyBytes();
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}
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void
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CopyEngine::CopyEngineChannel::readCopyBytes()
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{
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anBegin("ReadCopyBytes");
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DPRINTF(DMACopyEngine, "Reading %d bytes from buffer to memory location %#x(%#x)\n",
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curDmaDesc->len, curDmaDesc->dest,
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ce->platform->pciToDma(curDmaDesc->src));
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cePort->dmaAction(MemCmd::ReadReq, ce->platform->pciToDma(curDmaDesc->src),
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curDmaDesc->len, &readCompleteEvent, copyBuffer, 0);
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}
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void
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CopyEngine::CopyEngineChannel::readCopyBytesComplete()
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{
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DPRINTF(DMACopyEngine, "Read of bytes to copy complete\n");
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nextState = DMAWrite;
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if (inDrain()) return;
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writeCopyBytes();
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}
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void
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CopyEngine::CopyEngineChannel::writeCopyBytes()
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{
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anBegin("WriteCopyBytes");
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DPRINTF(DMACopyEngine, "Writing %d bytes from buffer to memory location %#x(%#x)\n",
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curDmaDesc->len, curDmaDesc->dest,
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ce->platform->pciToDma(curDmaDesc->dest));
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cePort->dmaAction(MemCmd::WriteReq, ce->platform->pciToDma(curDmaDesc->dest),
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curDmaDesc->len, &writeCompleteEvent, copyBuffer, 0);
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ce->bytesCopied[channelId] += curDmaDesc->len;
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ce->copiesProcessed[channelId]++;
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}
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|
|
|
void
|
|
CopyEngine::CopyEngineChannel::writeCopyBytesComplete()
|
|
{
|
|
DPRINTF(DMACopyEngine, "Write of bytes to copy complete user1: %#x\n",
|
|
curDmaDesc->user1);
|
|
|
|
cr.status.compl_desc_addr(lastDescriptorAddr >> 6);
|
|
completionDataReg = cr.status() | 1;
|
|
|
|
anQ("DMAUsedDescQ", channelId, 1);
|
|
anQ("AppRecvQ", curDmaDesc->user1, curDmaDesc->len);
|
|
if (curDmaDesc->command & DESC_CTRL_CP_STS) {
|
|
nextState = CompletionWrite;
|
|
if (inDrain()) return;
|
|
writeCompletionStatus();
|
|
return;
|
|
}
|
|
|
|
continueProcessing();
|
|
}
|
|
|
|
void
|
|
CopyEngine::CopyEngineChannel::continueProcessing()
|
|
{
|
|
busy = false;
|
|
|
|
if (underReset) {
|
|
anBegin("Reset");
|
|
anWait();
|
|
underReset = false;
|
|
refreshNext = false;
|
|
busy = false;
|
|
nextState = Idle;
|
|
return;
|
|
}
|
|
|
|
if (curDmaDesc->next) {
|
|
nextState = DescriptorFetch;
|
|
fetchAddress = curDmaDesc->next;
|
|
if (inDrain()) return;
|
|
fetchDescriptor(curDmaDesc->next);
|
|
} else if (refreshNext) {
|
|
nextState = AddressFetch;
|
|
refreshNext = false;
|
|
if (inDrain()) return;
|
|
fetchNextAddr(lastDescriptorAddr);
|
|
} else {
|
|
inDrain();
|
|
nextState = Idle;
|
|
anWait();
|
|
anBegin("Idle");
|
|
}
|
|
}
|
|
|
|
void
|
|
CopyEngine::CopyEngineChannel::writeCompletionStatus()
|
|
{
|
|
anBegin("WriteCompletionStatus");
|
|
DPRINTF(DMACopyEngine, "Writing completion status %#x to address %#x(%#x)\n",
|
|
completionDataReg, cr.completionAddr,
|
|
ce->platform->pciToDma(cr.completionAddr));
|
|
|
|
cePort->dmaAction(MemCmd::WriteReq, ce->platform->pciToDma(cr.completionAddr),
|
|
sizeof(completionDataReg), &statusCompleteEvent,
|
|
(uint8_t*)&completionDataReg, latAfterCompletion);
|
|
}
|
|
|
|
void
|
|
CopyEngine::CopyEngineChannel::writeStatusComplete()
|
|
{
|
|
DPRINTF(DMACopyEngine, "Writing completion status complete\n");
|
|
continueProcessing();
|
|
}
|
|
|
|
void
|
|
CopyEngine::CopyEngineChannel::fetchNextAddr(Addr address)
|
|
{
|
|
anBegin("FetchNextAddr");
|
|
DPRINTF(DMACopyEngine, "Fetching next address...\n");
|
|
busy = true;
|
|
cePort->dmaAction(MemCmd::ReadReq, ce->platform->pciToDma(address +
|
|
offsetof(DmaDesc, next)), sizeof(Addr), &addrCompleteEvent,
|
|
(uint8_t*)curDmaDesc + offsetof(DmaDesc, next), 0);
|
|
}
|
|
|
|
void
|
|
CopyEngine::CopyEngineChannel::fetchAddrComplete()
|
|
{
|
|
DPRINTF(DMACopyEngine, "Fetching next address complete: %#x\n",
|
|
curDmaDesc->next);
|
|
if (!curDmaDesc->next) {
|
|
DPRINTF(DMACopyEngine, "Got NULL descriptor, nothing more to do\n");
|
|
busy = false;
|
|
nextState = Idle;
|
|
anWait();
|
|
anBegin("Idle");
|
|
inDrain();
|
|
return;
|
|
}
|
|
nextState = DescriptorFetch;
|
|
fetchAddress = curDmaDesc->next;
|
|
if (inDrain()) return;
|
|
fetchDescriptor(curDmaDesc->next);
|
|
}
|
|
|
|
bool
|
|
CopyEngine::CopyEngineChannel::inDrain()
|
|
{
|
|
if (ce->getState() == SimObject::Draining) {
|
|
DPRINTF(DMACopyEngine, "processing drain\n");
|
|
assert(drainEvent);
|
|
drainEvent->process();
|
|
drainEvent = NULL;
|
|
}
|
|
|
|
return ce->getState() != SimObject::Running;
|
|
}
|
|
|
|
unsigned int
|
|
CopyEngine::CopyEngineChannel::drain(Event *de)
|
|
{
|
|
if (nextState == Idle || ce->getState() != SimObject::Running)
|
|
return 0;
|
|
unsigned int count = 1;
|
|
count += cePort->drain(de);
|
|
|
|
DPRINTF(DMACopyEngine, "unable to drain, returning %d\n", count);
|
|
drainEvent = de;
|
|
return count;
|
|
}
|
|
|
|
unsigned int
|
|
CopyEngine::drain(Event *de)
|
|
{
|
|
unsigned int count;
|
|
count = pioPort->drain(de) + dmaPort->drain(de) + configPort->drain(de);
|
|
for (int x = 0;x < chan.size(); x++)
|
|
count += chan[x]->drain(de);
|
|
|
|
if (count)
|
|
changeState(Draining);
|
|
else
|
|
changeState(Drained);
|
|
|
|
DPRINTF(DMACopyEngine, "call to CopyEngine::drain() returning %d\n", count);
|
|
return count;
|
|
}
|
|
|
|
void
|
|
CopyEngine::serialize(std::ostream &os)
|
|
{
|
|
PciDev::serialize(os);
|
|
regs.serialize(os);
|
|
for (int x =0; x < chan.size(); x++) {
|
|
nameOut(os, csprintf("%s.channel%d", name(), x));
|
|
chan[x]->serialize(os);
|
|
}
|
|
}
|
|
|
|
void
|
|
CopyEngine::unserialize(Checkpoint *cp, const std::string §ion)
|
|
{
|
|
PciDev::unserialize(cp, section);
|
|
regs.unserialize(cp, section);
|
|
for (int x = 0; x < chan.size(); x++)
|
|
chan[x]->unserialize(cp, csprintf("%s.channel%d", section, x));
|
|
}
|
|
|
|
void
|
|
CopyEngine::CopyEngineChannel::serialize(std::ostream &os)
|
|
{
|
|
SERIALIZE_SCALAR(channelId);
|
|
SERIALIZE_SCALAR(busy);
|
|
SERIALIZE_SCALAR(underReset);
|
|
SERIALIZE_SCALAR(refreshNext);
|
|
SERIALIZE_SCALAR(lastDescriptorAddr);
|
|
SERIALIZE_SCALAR(completionDataReg);
|
|
SERIALIZE_SCALAR(fetchAddress);
|
|
int nextState = this->nextState;
|
|
SERIALIZE_SCALAR(nextState);
|
|
arrayParamOut(os, "curDmaDesc", (uint8_t*)curDmaDesc, sizeof(DmaDesc));
|
|
SERIALIZE_ARRAY(copyBuffer, ce->params()->XferCap);
|
|
cr.serialize(os);
|
|
|
|
}
|
|
void
|
|
CopyEngine::CopyEngineChannel::unserialize(Checkpoint *cp, const std::string §ion)
|
|
{
|
|
UNSERIALIZE_SCALAR(channelId);
|
|
UNSERIALIZE_SCALAR(busy);
|
|
UNSERIALIZE_SCALAR(underReset);
|
|
UNSERIALIZE_SCALAR(refreshNext);
|
|
UNSERIALIZE_SCALAR(lastDescriptorAddr);
|
|
UNSERIALIZE_SCALAR(completionDataReg);
|
|
UNSERIALIZE_SCALAR(fetchAddress);
|
|
int nextState;
|
|
UNSERIALIZE_SCALAR(nextState);
|
|
this->nextState = (ChannelState)nextState;
|
|
arrayParamIn(cp, section, "curDmaDesc", (uint8_t*)curDmaDesc, sizeof(DmaDesc));
|
|
UNSERIALIZE_ARRAY(copyBuffer, ce->params()->XferCap);
|
|
cr.unserialize(cp, section);
|
|
|
|
}
|
|
|
|
void
|
|
CopyEngine::CopyEngineChannel::restartStateMachine()
|
|
{
|
|
switch(nextState) {
|
|
case AddressFetch:
|
|
fetchNextAddr(lastDescriptorAddr);
|
|
break;
|
|
case DescriptorFetch:
|
|
fetchDescriptor(fetchAddress);
|
|
break;
|
|
case DMARead:
|
|
readCopyBytes();
|
|
break;
|
|
case DMAWrite:
|
|
writeCopyBytes();
|
|
break;
|
|
case CompletionWrite:
|
|
writeCompletionStatus();
|
|
break;
|
|
case Idle:
|
|
break;
|
|
default:
|
|
panic("Unknown state for CopyEngineChannel\n");
|
|
}
|
|
}
|
|
|
|
void
|
|
CopyEngine::resume()
|
|
{
|
|
SimObject::resume();
|
|
for (int x = 0;x < chan.size(); x++)
|
|
chan[x]->resume();
|
|
}
|
|
|
|
|
|
void
|
|
CopyEngine::CopyEngineChannel::resume()
|
|
{
|
|
DPRINTF(DMACopyEngine, "Restarting state machine at state %d\n", nextState);
|
|
restartStateMachine();
|
|
}
|
|
|
|
CopyEngine *
|
|
CopyEngineParams::create()
|
|
{
|
|
return new CopyEngine(this);
|
|
}
|