840343dce314241772a6ae1990061bcbb1b7171a
2 * Copyright (c) 2006 The Regents of The University of Michigan
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
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11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 #include "base/chunk_generator.hh"
33 #include "base/trace.hh"
34 #include "debug/BusAddrRanges.hh"
35 #include "debug/DMA.hh"
36 #include "dev/io_device.hh"
37 #include "sim/system.hh"
39 PioPort::PioPort(PioDevice
*dev
, System
*s
, std::string pname
)
40 : SimpleTimingPort(dev
->name() + pname
, dev
), device(dev
)
45 PioPort::recvAtomic(PacketPtr pkt
)
47 return pkt
->isRead() ? device
->read(pkt
) : device
->write(pkt
);
51 PioPort::getAddrRanges()
53 return device
->getAddrRanges();
57 PioDevice::PioDevice(const Params
*p
)
58 : MemObject(p
), sys(p
->system
), pioPort(NULL
)
61 PioDevice::~PioDevice()
71 panic("Pio port of %s not connected to anything!", name());
72 pioPort
->sendRangeChange();
76 PioDevice::getPort(const std::string
&if_name
, int idx
)
78 if (if_name
== "pio") {
80 fatal("%s: pio port already connected to %s",
81 name(), pioPort
->getPeer()->name());
82 pioPort
= new PioPort(this, sys
);
89 PioDevice::drain(Event
*de
)
92 count
= pioPort
->drain(de
);
94 changeState(Draining
);
100 BasicPioDevice::BasicPioDevice(const Params
*p
)
101 : PioDevice(p
), pioAddr(p
->pio_addr
), pioSize(0),
102 pioDelay(p
->pio_latency
)
106 BasicPioDevice::getAddrRanges()
108 assert(pioSize
!= 0);
109 AddrRangeList ranges
;
110 DPRINTF(BusAddrRanges
, "registering range: %#x-%#x\n", pioAddr
, pioSize
);
111 ranges
.push_back(RangeSize(pioAddr
, pioSize
));
116 DmaPort::DmaPort(MemObject
*dev
, System
*s
, Tick min_backoff
, Tick max_backoff
,
118 : Port(dev
->name() + "-dmaport", dev
), device(dev
), sys(s
),
119 pendingCount(0), actionInProgress(0), drainEvent(NULL
),
120 backoffTime(0), minBackoffDelay(min_backoff
),
121 maxBackoffDelay(max_backoff
), inRetry(false), recvSnoops(recv_snoops
),
126 DmaPort::recvTiming(PacketPtr pkt
)
128 if (pkt
->wasNacked()) {
129 DPRINTF(DMA
, "Received nacked %s addr %#x\n",
130 pkt
->cmdString(), pkt
->getAddr());
132 if (backoffTime
< minBackoffDelay
)
133 backoffTime
= minBackoffDelay
;
134 else if (backoffTime
< maxBackoffDelay
)
137 device
->reschedule(backoffEvent
, curTick() + backoffTime
, true);
139 DPRINTF(DMA
, "Backoff time set to %d ticks\n", backoffTime
);
143 } else if (pkt
->isRequest() && recvSnoops
) {
145 } else if (pkt
->senderState
) {
149 DPRINTF(DMA
, "Received response %s addr %#x size %#x\n",
150 pkt
->cmdString(), pkt
->getAddr(), pkt
->req
->getSize());
151 state
= dynamic_cast<DmaReqState
*>(pkt
->senderState
);
154 assert(pendingCount
>= 0);
157 // We shouldn't ever get a block in ownership state
158 assert(!(pkt
->memInhibitAsserted() && !pkt
->sharedAsserted()));
160 state
->numBytes
+= pkt
->req
->getSize();
161 assert(state
->totBytes
>= state
->numBytes
);
162 if (state
->totBytes
== state
->numBytes
) {
163 if (state
->completionEvent
) {
165 device
->schedule(state
->completionEvent
,
166 curTick() + state
->delay
);
168 state
->completionEvent
->process();
175 if (pendingCount
== 0 && drainEvent
) {
176 drainEvent
->process();
180 panic("Got packet without sender state... huh?\n");
186 DmaDevice::DmaDevice(const Params
*p
)
187 : PioDevice(p
), dmaPort(NULL
)
192 DmaDevice::drain(Event
*de
)
195 count
= pioPort
->drain(de
) + dmaPort
->drain(de
);
197 changeState(Draining
);
199 changeState(Drained
);
204 DmaPort::drain(Event
*de
)
206 if (pendingCount
== 0)
216 assert(transmitList
.size());
219 PacketPtr pkt
= transmitList
.front();
220 DPRINTF(DMA
, "Retry on %s addr %#x\n",
221 pkt
->cmdString(), pkt
->getAddr());
222 result
= sendTiming(pkt
);
224 DPRINTF(DMA
, "-- Done\n");
225 transmitList
.pop_front();
229 DPRINTF(DMA
, "-- Failed, queued\n");
231 } while (!backoffTime
&& result
&& transmitList
.size());
233 if (transmitList
.size() && backoffTime
&& !inRetry
) {
234 DPRINTF(DMA
, "Scheduling backoff for %d\n", curTick()+backoffTime
);
235 if (!backoffEvent
.scheduled())
236 device
->schedule(backoffEvent
, backoffTime
+ curTick());
238 DPRINTF(DMA
, "TransmitList: %d, backoffTime: %d inRetry: %d es: %d\n",
239 transmitList
.size(), backoffTime
, inRetry
,
240 backoffEvent
.scheduled());
245 DmaPort::dmaAction(Packet::Command cmd
, Addr addr
, int size
, Event
*event
,
246 uint8_t *data
, Tick delay
, Request::Flags flag
)
248 assert(device
->getState() == SimObject::Running
);
250 DmaReqState
*reqState
= new DmaReqState(event
, this, size
, delay
);
253 DPRINTF(DMA
, "Starting DMA for addr: %#x size: %d sched: %d\n", addr
, size
,
254 event
? event
->scheduled() : -1 );
255 for (ChunkGenerator
gen(addr
, size
, peerBlockSize());
256 !gen
.done(); gen
.next()) {
257 Request
*req
= new Request(gen
.addr(), gen
.size(), flag
);
258 PacketPtr pkt
= new Packet(req
, cmd
, Packet::Broadcast
);
260 // Increment the data pointer on a write
262 pkt
->dataStatic(data
+ gen
.complete());
264 pkt
->senderState
= reqState
;
266 assert(pendingCount
>= 0);
268 DPRINTF(DMA
, "--Queuing DMA for addr: %#x size: %d\n", gen
.addr(),
276 DmaPort::queueDma(PacketPtr pkt
, bool front
)
280 transmitList
.push_front(pkt
);
282 transmitList
.push_back(pkt
);
290 // some kind of selction between access methods
291 // more work is going to have to be done to make
292 // switching actually work
293 assert(transmitList
.size());
294 PacketPtr pkt
= transmitList
.front();
296 Enums::MemoryMode state
= sys
->getMemoryMode();
297 if (state
== Enums::timing
) {
298 if (backoffEvent
.scheduled() || inRetry
) {
299 DPRINTF(DMA
, "Can't send immediately, waiting for retry or backoff timer\n");
303 DPRINTF(DMA
, "Attempting to send %s addr %#x\n",
304 pkt
->cmdString(), pkt
->getAddr());
308 result
= sendTiming(pkt
);
310 transmitList
.pop_front();
311 DPRINTF(DMA
, "-- Done\n");
314 DPRINTF(DMA
, "-- Failed: queued\n");
316 } while (result
&& !backoffTime
&& transmitList
.size());
318 if (transmitList
.size() && backoffTime
&& !inRetry
&&
319 !backoffEvent
.scheduled()) {
320 DPRINTF(DMA
, "-- Scheduling backoff timer for %d\n",
321 backoffTime
+curTick());
322 device
->schedule(backoffEvent
, backoffTime
+ curTick());
324 } else if (state
== Enums::atomic
) {
325 transmitList
.pop_front();
328 DPRINTF(DMA
, "--Sending DMA for addr: %#x size: %d\n",
329 pkt
->req
->getPaddr(), pkt
->req
->getSize());
330 lat
= sendAtomic(pkt
);
331 assert(pkt
->senderState
);
332 DmaReqState
*state
= dynamic_cast<DmaReqState
*>(pkt
->senderState
);
334 state
->numBytes
+= pkt
->req
->getSize();
336 DPRINTF(DMA
, "--Received response for DMA for addr: %#x size: %d nb: %d, tot: %d sched %d\n",
337 pkt
->req
->getPaddr(), pkt
->req
->getSize(), state
->numBytes
,
339 state
->completionEvent
? state
->completionEvent
->scheduled() : 0 );
341 if (state
->totBytes
== state
->numBytes
) {
342 if (state
->completionEvent
) {
343 assert(!state
->completionEvent
->scheduled());
344 device
->schedule(state
->completionEvent
,
345 curTick() + lat
+ state
->delay
);
351 assert(pendingCount
>= 0);
354 if (pendingCount
== 0 && drainEvent
) {
355 drainEvent
->process();
360 panic("Unknown memory command state.");
363 DmaDevice::~DmaDevice()
371 DmaDevice::getPort(const std::string
&if_name
, int idx
)
373 if (if_name
== "dma") {
375 fatal("%s: dma port already connected to %s",
376 name(), dmaPort
->getPeer()->name());
377 dmaPort
= new DmaPort(this, sys
, params()->min_backoff_delay
,
378 params()->max_backoff_delay
);
381 return PioDevice::getPort(if_name
, idx
);