/*
+ * Copyright (c) 2012, 2015 ARM Limited
+ * All rights reserved.
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder. You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
* Copyright (c) 2006 The Regents of The University of Michigan
* All rights reserved.
*
* Nathan Binkert
*/
-#include "base/chunk_generator.hh"
#include "base/trace.hh"
+#include "debug/AddrRanges.hh"
#include "dev/io_device.hh"
#include "sim/system.hh"
-
-PioPort::PioPort(PioDevice *dev, System *s, std::string pname)
- : SimpleTimingPort(dev->name() + pname, dev), device(dev)
-{ }
-
+PioPort::PioPort(PioDevice *dev)
+ : SimpleTimingPort(dev->name() + ".pio", dev), device(dev)
+{
+}
Tick
PioPort::recvAtomic(PacketPtr pkt)
{
- return pkt->isRead() ? device->read(pkt) : device->write(pkt);
+ // technically the packet only reaches us after the header delay,
+ // and typically we also need to deserialise any payload
+ Tick receive_delay = pkt->headerDelay + pkt->payloadDelay;
+ pkt->headerDelay = pkt->payloadDelay = 0;
+
+ const Tick delay(pkt->isRead() ? device->read(pkt) : device->write(pkt));
+ assert(pkt->isResponse() || pkt->isError());
+ return delay + receive_delay;
}
-void
-PioPort::getDeviceAddressRanges(AddrRangeList &resp, bool &snoop)
+AddrRangeList
+PioPort::getAddrRanges() const
{
- snoop = false;
- device->addressRanges(resp);
- for (AddrRangeIter i = resp.begin(); i != resp.end(); i++)
- DPRINTF(BusAddrRanges, "Adding Range %#x-%#x\n", i->start, i->end);
+ return device->getAddrRanges();
}
-
PioDevice::PioDevice(const Params *p)
- : MemObject(p), platform(p->platform), sys(p->system), pioPort(NULL)
+ : MemObject(p), sys(p->system), pioPort(this)
{}
PioDevice::~PioDevice()
{
- if (pioPort)
- delete pioPort;
}
void
PioDevice::init()
{
- if (!pioPort)
- panic("Pio port not connected to anything!");
- pioPort->sendStatusChange(Port::RangeChange);
+ if (!pioPort.isConnected())
+ panic("Pio port of %s not connected to anything!", name());
+ pioPort.sendRangeChange();
}
-
-unsigned int
-PioDevice::drain(Event *de)
+BaseSlavePort &
+PioDevice::getSlavePort(const std::string &if_name, PortID idx)
{
- unsigned int count;
- count = pioPort->drain(de);
- if (count)
- changeState(Draining);
- else
- changeState(Drained);
- return count;
+ if (if_name == "pio") {
+ return pioPort;
+ }
+ return MemObject::getSlavePort(if_name, idx);
}
-BasicPioDevice::BasicPioDevice(const Params *p)
- : PioDevice(p), pioAddr(p->pio_addr), pioSize(0),
+BasicPioDevice::BasicPioDevice(const Params *p, Addr size)
+ : PioDevice(p), pioAddr(p->pio_addr), pioSize(size),
pioDelay(p->pio_latency)
{}
-void
-BasicPioDevice::addressRanges(AddrRangeList &range_list)
+AddrRangeList
+BasicPioDevice::getAddrRanges() const
{
assert(pioSize != 0);
- range_list.clear();
- DPRINTF(BusAddrRanges, "registering range: %#x-%#x\n", pioAddr, pioSize);
- range_list.push_back(RangeSize(pioAddr, pioSize));
-}
-
-
-DmaPort::DmaPort(MemObject *dev, System *s, Tick min_backoff, Tick max_backoff)
- : Port(dev->name() + "-dmaport", dev), device(dev), sys(s),
- pendingCount(0), actionInProgress(0), drainEvent(NULL),
- backoffTime(0), minBackoffDelay(min_backoff),
- maxBackoffDelay(max_backoff), inRetry(false), backoffEvent(this)
-{ }
-
-bool
-DmaPort::recvTiming(PacketPtr pkt)
-{
- if (pkt->wasNacked()) {
- DPRINTF(DMA, "Received nacked %s addr %#x\n",
- pkt->cmdString(), pkt->getAddr());
-
- if (backoffTime < minBackoffDelay)
- backoffTime = minBackoffDelay;
- else if (backoffTime < maxBackoffDelay)
- backoffTime <<= 1;
-
- reschedule(backoffEvent, curTick + backoffTime, true);
-
- DPRINTF(DMA, "Backoff time set to %d ticks\n", backoffTime);
-
- pkt->reinitNacked();
- queueDma(pkt, true);
- } else if (pkt->senderState) {
- DmaReqState *state;
- backoffTime >>= 2;
-
- DPRINTF(DMA, "Received response %s addr %#x size %#x\n",
- pkt->cmdString(), pkt->getAddr(), pkt->req->getSize());
- state = dynamic_cast<DmaReqState*>(pkt->senderState);
- pendingCount--;
-
- assert(pendingCount >= 0);
- assert(state);
-
- state->numBytes += pkt->req->getSize();
- assert(state->totBytes >= state->numBytes);
- if (state->totBytes == state->numBytes) {
- if (state->completionEvent) {
- if (state->delay)
- schedule(state->completionEvent, curTick + state->delay);
- else
- state->completionEvent->process();
- }
- delete state;
- }
- delete pkt->req;
- delete pkt;
-
- if (pendingCount == 0 && drainEvent) {
- drainEvent->process();
- drainEvent = NULL;
- }
- } else {
- panic("Got packet without sender state... huh?\n");
- }
-
- return true;
-}
-
-DmaDevice::DmaDevice(const Params *p)
- : PioDevice(p), dmaPort(NULL)
-{ }
-
-
-unsigned int
-DmaDevice::drain(Event *de)
-{
- unsigned int count;
- count = pioPort->drain(de) + dmaPort->drain(de);
- if (count)
- changeState(Draining);
- else
- changeState(Drained);
- return count;
-}
-
-unsigned int
-DmaPort::drain(Event *de)
-{
- if (pendingCount == 0)
- return 0;
- drainEvent = de;
- return 1;
-}
-
-
-void
-DmaPort::recvRetry()
-{
- assert(transmitList.size());
- bool result = true;
- do {
- PacketPtr pkt = transmitList.front();
- DPRINTF(DMA, "Retry on %s addr %#x\n",
- pkt->cmdString(), pkt->getAddr());
- result = sendTiming(pkt);
- if (result) {
- DPRINTF(DMA, "-- Done\n");
- transmitList.pop_front();
- inRetry = false;
- } else {
- inRetry = true;
- DPRINTF(DMA, "-- Failed, queued\n");
- }
- } while (!backoffTime && result && transmitList.size());
-
- if (transmitList.size() && backoffTime && !inRetry) {
- DPRINTF(DMA, "Scheduling backoff for %d\n", curTick+backoffTime);
- if (!backoffEvent.scheduled())
- schedule(backoffEvent, backoffTime + curTick);
- }
- DPRINTF(DMA, "TransmitList: %d, backoffTime: %d inRetry: %d es: %d\n",
- transmitList.size(), backoffTime, inRetry,
- backoffEvent.scheduled());
-}
-
-
-void
-DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,
- uint8_t *data, Tick delay, Request::Flags flag)
-{
- assert(device->getState() == SimObject::Running);
-
- DmaReqState *reqState = new DmaReqState(event, this, size, delay);
-
-
- DPRINTF(DMA, "Starting DMA for addr: %#x size: %d sched: %d\n", addr, size,
- event ? event->scheduled() : -1 );
- for (ChunkGenerator gen(addr, size, peerBlockSize());
- !gen.done(); gen.next()) {
- Request *req = new Request(gen.addr(), gen.size(), flag);
- PacketPtr pkt = new Packet(req, cmd, Packet::Broadcast);
-
- // Increment the data pointer on a write
- if (data)
- pkt->dataStatic(data + gen.complete());
-
- pkt->senderState = reqState;
-
- assert(pendingCount >= 0);
- pendingCount++;
- DPRINTF(DMA, "--Queuing DMA for addr: %#x size: %d\n", gen.addr(),
- gen.size());
- queueDma(pkt);
- }
-
-}
-
-void
-DmaPort::queueDma(PacketPtr pkt, bool front)
-{
-
- if (front)
- transmitList.push_front(pkt);
- else
- transmitList.push_back(pkt);
- sendDma();
-}
-
-
-void
-DmaPort::sendDma()
-{
- // some kind of selction between access methods
- // more work is going to have to be done to make
- // switching actually work
- assert(transmitList.size());
- PacketPtr pkt = transmitList.front();
-
- Enums::MemoryMode state = sys->getMemoryMode();
- if (state == Enums::timing) {
- if (backoffEvent.scheduled() || inRetry) {
- DPRINTF(DMA, "Can't send immediately, waiting for retry or backoff timer\n");
- return;
- }
-
- DPRINTF(DMA, "Attempting to send %s addr %#x\n",
- pkt->cmdString(), pkt->getAddr());
-
- bool result;
- do {
- result = sendTiming(pkt);
- if (result) {
- transmitList.pop_front();
- DPRINTF(DMA, "-- Done\n");
- } else {
- inRetry = true;
- DPRINTF(DMA, "-- Failed: queued\n");
- }
- } while (result && !backoffTime && transmitList.size());
-
- if (transmitList.size() && backoffTime && !inRetry &&
- !backoffEvent.scheduled()) {
- DPRINTF(DMA, "-- Scheduling backoff timer for %d\n",
- backoffTime+curTick);
- schedule(backoffEvent, backoffTime + curTick);
- }
- } else if (state == Enums::atomic) {
- transmitList.pop_front();
-
- Tick lat;
- DPRINTF(DMA, "--Sending DMA for addr: %#x size: %d\n",
- pkt->req->getPaddr(), pkt->req->getSize());
- lat = sendAtomic(pkt);
- assert(pkt->senderState);
- DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState);
- assert(state);
- state->numBytes += pkt->req->getSize();
-
- DPRINTF(DMA, "--Received response for DMA for addr: %#x size: %d nb: %d, tot: %d sched %d\n",
- pkt->req->getPaddr(), pkt->req->getSize(), state->numBytes,
- state->totBytes,
- state->completionEvent ? state->completionEvent->scheduled() : 0 );
-
- if (state->totBytes == state->numBytes) {
- if (state->completionEvent) {
- assert(!state->completionEvent->scheduled());
- schedule(state->completionEvent, curTick + lat + state->delay);
- }
- delete state;
- delete pkt->req;
- }
- pendingCount--;
- assert(pendingCount >= 0);
- delete pkt;
-
- if (pendingCount == 0 && drainEvent) {
- drainEvent->process();
- drainEvent = NULL;
- }
-
- } else
- panic("Unknown memory command state.");
-}
-
-DmaDevice::~DmaDevice()
-{
- if (dmaPort)
- delete dmaPort;
+ AddrRangeList ranges;
+ DPRINTF(AddrRanges, "registering range: %#x-%#x\n", pioAddr, pioSize);
+ ranges.push_back(RangeSize(pioAddr, pioSize));
+ return ranges;
}
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