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/*
* Copyright (c) 2008 The Regents of The University of Michigan
* All rights reserved.
*
* 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.
*
* Authors: Ali Saidi
*/
/* @file
* Device model for Intel's I/O Acceleration Technology (I/OAT).
* A DMA asyncronous copy engine
*/
#ifndef __DEV_COPY_ENGINE_HH__
#define __DEV_COPY_ENGINE_HH__
#include <vector>
#include "base/statistics.hh"
#include "dev/copy_engine_defs.hh"
#include "dev/pcidev.hh"
#include "params/CopyEngine.hh"
#include "sim/eventq.hh"
class CopyEngine : public PciDev
{
class CopyEngineChannel
{
private:
DmaPort *cePort;
CopyEngine *ce;
CopyEngineReg::ChanRegs cr;
int channelId;
CopyEngineReg::DmaDesc *curDmaDesc;
uint8_t *copyBuffer;
bool busy;
bool underReset;
bool refreshNext;
Addr lastDescriptorAddr;
Addr fetchAddress;
Tick latBeforeBegin;
Tick latAfterCompletion;
uint64_t completionDataReg;
enum ChannelState {
Idle,
AddressFetch,
DescriptorFetch,
DMARead,
DMAWrite,
CompletionWrite
};
ChannelState nextState;
Event *drainEvent;
public:
CopyEngineChannel(CopyEngine *_ce, int cid);
virtual ~CopyEngineChannel();
void init();
std::string name() { assert(ce); return ce->name() + csprintf("-chan%d", channelId); }
virtual void addressRanges(AddrRangeList &range_list) { range_list.clear(); }
virtual Tick read(PacketPtr pkt)
{ panic("CopyEngineChannel has no I/O access\n");}
virtual Tick write(PacketPtr pkt)
{ panic("CopyEngineChannel has no I/O access\n"); }
void channelRead(PacketPtr pkt, Addr daddr, int size);
void channelWrite(PacketPtr pkt, Addr daddr, int size);
unsigned int drain(Event *de);
void resume();
void serialize(std::ostream &os);
void unserialize(Checkpoint *cp, const std::string §ion);
private:
void fetchDescriptor(Addr address);
void fetchDescComplete();
EventWrapper<CopyEngineChannel, &CopyEngineChannel::fetchDescComplete>
fetchCompleteEvent;
void fetchNextAddr(Addr address);
void fetchAddrComplete();
EventWrapper<CopyEngineChannel, &CopyEngineChannel::fetchAddrComplete>
addrCompleteEvent;
void readCopyBytes();
void readCopyBytesComplete();
EventWrapper<CopyEngineChannel, &CopyEngineChannel::readCopyBytesComplete>
readCompleteEvent;
void writeCopyBytes();
void writeCopyBytesComplete();
EventWrapper <CopyEngineChannel, &CopyEngineChannel::writeCopyBytesComplete>
writeCompleteEvent;
void writeCompletionStatus();
void writeStatusComplete();
EventWrapper <CopyEngineChannel, &CopyEngineChannel::writeStatusComplete>
statusCompleteEvent;
void continueProcessing();
void recvCommand();
bool inDrain();
void restartStateMachine();
};
private:
Stats::Vector<> bytesCopied;
Stats::Vector<> copiesProcessed;
// device registers
CopyEngineReg::Regs regs;
// Array of channels each one with regs/dma port/etc
std::vector<CopyEngineChannel*> chan;
public:
typedef CopyEngineParams Params;
const Params *
params() const
{
return dynamic_cast<const Params *>(_params);
}
CopyEngine(const Params *params);
~CopyEngine();
void regStats();
void init();
virtual Tick read(PacketPtr pkt);
virtual Tick write(PacketPtr pkt);
virtual void serialize(std::ostream &os);
virtual void unserialize(Checkpoint *cp, const std::string §ion);
virtual unsigned int drain(Event *de);
virtual void resume();
};
#endif //__DEV_COPY_ENGINE_HH__
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