2 * Copyright (c) 2011-2012 ARM Limited
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
14 * Copyright (c) 2006 The Regents of The University of Michigan
15 * All rights reserved.
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
47 * Definition of a bus object.
50 #include "base/misc.hh"
51 #include "base/trace.hh"
52 #include "debug/Bus.hh"
53 #include "debug/BusAddrRanges.hh"
56 Bus::Bus(const BusParams
*p
)
57 : MemObject(p
), clock(p
->clock
),
58 headerCycles(p
->header_cycles
), width(p
->width
), tickNextIdle(0),
59 drainEvent(NULL
), busIdleEvent(this), inRetry(false),
60 defaultPortId(Port::INVALID_PORT_ID
),
61 useDefaultRange(p
->use_default_range
),
62 defaultBlockSize(p
->block_size
),
63 cachedBlockSize(0), cachedBlockSizeValid(false)
65 //width, clock period, and header cycles must be positive
67 fatal("Bus width must be positive\n");
69 fatal("Bus clock period must be positive\n");
70 if (headerCycles
<= 0)
71 fatal("Number of header cycles must be positive\n");
73 // create the ports based on the size of the master and slave
74 // vector ports, and the presence of the default port, the ports
75 // are enumerated starting from zero
76 for (int i
= 0; i
< p
->port_master_connection_count
; ++i
) {
77 std::string portName
= csprintf("%s-p%d", name(), i
);
78 MasterPort
* bp
= new BusMasterPort(portName
, this, i
);
79 masterPorts
.push_back(bp
);
82 // see if we have a default slave device connected and if so add
83 // our corresponding master port
84 if (p
->port_default_connection_count
) {
85 defaultPortId
= masterPorts
.size();
86 std::string portName
= csprintf("%s-default", name());
87 MasterPort
* bp
= new BusMasterPort(portName
, this, defaultPortId
);
88 masterPorts
.push_back(bp
);
91 // create the slave ports, once again starting at zero
92 for (int i
= 0; i
< p
->port_slave_connection_count
; ++i
) {
93 std::string portName
= csprintf("%s-p%d", name(), i
);
94 SlavePort
* bp
= new BusSlavePort(portName
, this, i
);
95 slavePorts
.push_back(bp
);
102 Bus::getMasterPort(const std::string
&if_name
, int idx
)
104 if (if_name
== "master" && idx
< masterPorts
.size()) {
105 // the master port index translates directly to the vector position
106 return *masterPorts
[idx
];
107 } else if (if_name
== "default") {
108 return *masterPorts
[defaultPortId
];
110 return MemObject::getMasterPort(if_name
, idx
);
115 Bus::getSlavePort(const std::string
&if_name
, int idx
)
117 if (if_name
== "slave" && idx
< slavePorts
.size()) {
118 // the slave port index translates directly to the vector position
119 return *slavePorts
[idx
];
121 return MemObject::getSlavePort(if_name
, idx
);
128 // iterate over our slave ports and determine which of our
129 // neighbouring master ports are snooping and add them as snoopers
130 for (SlavePortConstIter p
= slavePorts
.begin(); p
!= slavePorts
.end();
132 if ((*p
)->getMasterPort().isSnooping()) {
133 DPRINTF(BusAddrRanges
, "Adding snooping neighbour %s\n",
134 (*p
)->getMasterPort().name());
135 snoopPorts
.push_back(*p
);
141 Bus::calcPacketTiming(PacketPtr pkt
)
143 // determine the current time rounded to the closest following
145 Tick now
= curTick();
146 if (now
% clock
!= 0) {
147 now
= ((now
/ clock
) + 1) * clock
;
150 Tick headerTime
= now
+ headerCycles
* clock
;
152 // The packet will be sent. Figure out how long it occupies the bus, and
153 // how much of that time is for the first "word", aka bus width.
155 if (pkt
->hasData()) {
156 // If a packet has data, it needs ceil(size/width) cycles to send it
157 int dataSize
= pkt
->getSize();
158 numCycles
+= dataSize
/width
;
159 if (dataSize
% width
)
163 // The first word will be delivered after the current tick, the delivery
164 // of the address if any, and one bus cycle to deliver the data
165 pkt
->firstWordTime
= headerTime
+ clock
;
167 pkt
->finishTime
= headerTime
+ numCycles
* clock
;
172 void Bus::occupyBus(Tick until
)
175 // shortcut for express snoop packets
179 tickNextIdle
= until
;
180 reschedule(busIdleEvent
, tickNextIdle
, true);
182 DPRINTF(Bus
, "The bus is now occupied from tick %d to %d\n",
183 curTick(), tickNextIdle
);
187 Bus::isOccupied(PacketPtr pkt
, Port
* port
)
189 // first we see if the next idle tick is in the future, next the
190 // bus is considered occupied if there are ports on the retry list
191 // and we are not in a retry with the current port
192 if (tickNextIdle
> curTick() ||
193 (!retryList
.empty() && !(inRetry
&& port
== retryList
.front()))) {
194 addToRetryList(port
);
201 Bus::recvTimingReq(PacketPtr pkt
)
203 // determine the source port based on the id
204 SlavePort
*src_port
= slavePorts
[pkt
->getSrc()];
206 // test if the bus should be considered occupied for the current
207 // packet, and exclude express snoops from the check
208 if (!pkt
->isExpressSnoop() && isOccupied(pkt
, src_port
)) {
209 DPRINTF(Bus
, "recvTimingReq: src %s %s 0x%x BUSY\n",
210 src_port
->name(), pkt
->cmdString(), pkt
->getAddr());
214 DPRINTF(Bus
, "recvTimingReq: src %s %s 0x%x\n",
215 src_port
->name(), pkt
->cmdString(), pkt
->getAddr());
217 Tick headerFinishTime
= pkt
->isExpressSnoop() ? 0 : calcPacketTiming(pkt
);
218 Tick packetFinishTime
= pkt
->isExpressSnoop() ? 0 : pkt
->finishTime
;
220 // the packet is a memory-mapped request and should be
221 // broadcasted to our snoopers but the source
222 forwardTiming(pkt
, pkt
->getSrc());
224 // remember if we add an outstanding req so we can undo it if
225 // necessary, if the packet needs a response, we should add it
226 // as outstanding and express snoops never fail so there is
227 // not need to worry about them
228 bool add_outstanding
= !pkt
->isExpressSnoop() && pkt
->needsResponse();
230 // keep track that we have an outstanding request packet
231 // matching this request, this is used by the coherency
232 // mechanism in determining what to do with snoop responses
233 // (in recvTimingSnoop)
234 if (add_outstanding
) {
235 // we should never have an exsiting request outstanding
236 assert(outstandingReq
.find(pkt
->req
) == outstandingReq
.end());
237 outstandingReq
.insert(pkt
->req
);
240 // since it is a normal request, determine the destination
241 // based on the address and attempt to send the packet
242 bool success
= masterPorts
[findPort(pkt
->getAddr())]->sendTimingReq(pkt
);
245 // inhibited packets should never be forced to retry
246 assert(!pkt
->memInhibitAsserted());
248 // if it was added as outstanding and the send failed, then
251 outstandingReq
.erase(pkt
->req
);
253 DPRINTF(Bus
, "recvTimingReq: src %s %s 0x%x RETRY\n",
254 src_port
->name(), pkt
->cmdString(), pkt
->getAddr());
256 addToRetryList(src_port
);
257 occupyBus(headerFinishTime
);
262 succeededTiming(packetFinishTime
);
268 Bus::recvTimingResp(PacketPtr pkt
)
270 // determine the source port based on the id
271 MasterPort
*src_port
= masterPorts
[pkt
->getSrc()];
273 // test if the bus should be considered occupied for the current
275 if (isOccupied(pkt
, src_port
)) {
276 DPRINTF(Bus
, "recvTimingResp: src %s %s 0x%x BUSY\n",
277 src_port
->name(), pkt
->cmdString(), pkt
->getAddr());
281 DPRINTF(Bus
, "recvTimingResp: src %s %s 0x%x\n",
282 src_port
->name(), pkt
->cmdString(), pkt
->getAddr());
284 calcPacketTiming(pkt
);
285 Tick packetFinishTime
= pkt
->finishTime
;
287 // the packet is a normal response to a request that we should
288 // have seen passing through the bus
289 assert(outstandingReq
.find(pkt
->req
) != outstandingReq
.end());
291 // remove it as outstanding
292 outstandingReq
.erase(pkt
->req
);
294 // send the packet to the destination through one of our slave
295 // ports, as determined by the destination field
296 bool success M5_VAR_USED
= slavePorts
[pkt
->getDest()]->sendTimingResp(pkt
);
298 // currently it is illegal to block responses... can lead to
302 succeededTiming(packetFinishTime
);
308 Bus::recvTimingSnoopReq(PacketPtr pkt
)
310 DPRINTF(Bus
, "recvTimingSnoopReq: src %s %s 0x%x\n",
311 masterPorts
[pkt
->getSrc()]->name(), pkt
->cmdString(),
314 // we should only see express snoops from caches
315 assert(pkt
->isExpressSnoop());
317 // forward to all snoopers
318 forwardTiming(pkt
, Port::INVALID_PORT_ID
);
320 // a snoop request came from a connected slave device (one of
321 // our master ports), and if it is not coming from the slave
322 // device responsible for the address range something is
323 // wrong, hence there is nothing further to do as the packet
324 // would be going back to where it came from
325 assert(pkt
->getSrc() == findPort(pkt
->getAddr()));
327 // this is an express snoop and is never forced to retry
332 Bus::recvTimingSnoopResp(PacketPtr pkt
)
334 // determine the source port based on the id
335 SlavePort
* src_port
= slavePorts
[pkt
->getSrc()];
337 if (isOccupied(pkt
, src_port
)) {
338 DPRINTF(Bus
, "recvTimingSnoopResp: src %s %s 0x%x BUSY\n",
339 src_port
->name(), pkt
->cmdString(), pkt
->getAddr());
343 DPRINTF(Bus
, "recvTimingSnoop: src %s %s 0x%x\n",
344 src_port
->name(), pkt
->cmdString(), pkt
->getAddr());
346 // get the destination from the packet
347 Packet::NodeID dest
= pkt
->getDest();
349 // responses are never express snoops
350 assert(!pkt
->isExpressSnoop());
352 calcPacketTiming(pkt
);
353 Tick packetFinishTime
= pkt
->finishTime
;
355 // determine if the response is from a snoop request we
356 // created as the result of a normal request (in which case it
357 // should be in the outstandingReq), or if we merely forwarded
358 // someone else's snoop request
359 if (outstandingReq
.find(pkt
->req
) == outstandingReq
.end()) {
360 // this is a snoop response to a snoop request we
361 // forwarded, e.g. coming from the L1 and going to the L2
362 // this should be forwarded as a snoop response
363 bool success M5_VAR_USED
= masterPorts
[dest
]->sendTimingSnoopResp(pkt
);
366 // we got a snoop response on one of our slave ports,
367 // i.e. from a coherent master connected to the bus, and
368 // since we created the snoop request as part of
369 // recvTiming, this should now be a normal response again
370 outstandingReq
.erase(pkt
->req
);
372 // this is a snoop response from a coherent master, with a
373 // destination field set on its way through the bus as
374 // request, hence it should never go back to where the
375 // snoop response came from, but instead to where the
376 // original request came from
377 assert(pkt
->getSrc() != dest
);
379 // as a normal response, it should go back to a master
380 // through one of our slave ports
381 bool success M5_VAR_USED
= slavePorts
[dest
]->sendTimingResp(pkt
);
383 // currently it is illegal to block responses... can lead
388 succeededTiming(packetFinishTime
);
395 Bus::succeededTiming(Tick busy_time
)
397 // occupy the bus accordingly
398 occupyBus(busy_time
);
400 // if a retrying port succeeded, also take it off the retry list
402 DPRINTF(Bus
, "Remove retry from list %s\n",
403 retryList
.front()->name());
404 retryList
.pop_front();
410 Bus::forwardTiming(PacketPtr pkt
, int exclude_slave_port_id
)
412 for (SlavePortIter s
= snoopPorts
.begin(); s
!= snoopPorts
.end(); ++s
) {
414 // we could have gotten this request from a snooping master
415 // (corresponding to our own slave port that is also in
416 // snoopPorts) and should not send it back to where it came
418 if (exclude_slave_port_id
== Port::INVALID_PORT_ID
||
419 p
->getId() != exclude_slave_port_id
) {
420 // cache is not allowed to refuse snoop
421 p
->sendTimingSnoopReq(pkt
);
429 // releasing the bus means we should now be idle
430 assert(curTick() >= tickNextIdle
);
432 // bus is now idle, so if someone is waiting we can retry
433 if (!retryList
.empty()) {
434 // note that we block (return false on recvTiming) both
435 // because the bus is busy and because the destination is
436 // busy, and in the latter case the bus may be released before
437 // we see a retry from the destination
441 //If we weren't able to drain before, we might be able to now.
442 if (drainEvent
&& retryList
.empty() && curTick() >= tickNextIdle
) {
443 drainEvent
->process();
444 // Clear the drain event once we're done with it.
452 // this should never be called with an empty retry list
453 assert(!retryList
.empty());
455 // send a retry to the port at the head of the retry list
458 // note that we might have blocked on the receiving port being
459 // busy (rather than the bus itself) and now call retry before the
460 // destination called retry on the bus
461 retryList
.front()->sendRetry();
463 // If inRetry is still true, sendTiming wasn't called in zero time
464 // (e.g. the cache does this)
466 retryList
.pop_front();
469 //Bring tickNextIdle up to the present
470 while (tickNextIdle
< curTick())
471 tickNextIdle
+= clock
;
473 //Burn a cycle for the missed grant.
474 tickNextIdle
+= clock
;
476 reschedule(busIdleEvent
, tickNextIdle
, true);
481 Bus::recvRetry(Port::PortId id
)
483 // we got a retry from a peer that we tried to send something to
484 // and failed, but we sent it on the account of someone else, and
485 // that source port should be on our retry list, however if the
486 // bus is released before this happens and the retry (from the bus
487 // point of view) is successful then this no longer holds and we
488 // could in fact have an empty retry list
489 if (retryList
.empty())
492 // if the bus isn't busy
493 if (curTick() >= tickNextIdle
) {
494 // note that we do not care who told us to retry at the moment, we
495 // merely let the first one on the retry list go
501 Bus::findPort(Addr addr
)
503 /* An interval tree would be a better way to do this. --ali. */
506 dest_id
= checkPortCache(addr
);
507 if (dest_id
!= Port::INVALID_PORT_ID
)
510 // Check normal port ranges
511 PortIter i
= portMap
.find(RangeSize(addr
,1));
512 if (i
!= portMap
.end()) {
514 updatePortCache(dest_id
, i
->first
.start
, i
->first
.end
);
518 // Check if this matches the default range
519 if (useDefaultRange
) {
520 AddrRangeIter a_end
= defaultRange
.end();
521 for (AddrRangeIter i
= defaultRange
.begin(); i
!= a_end
; i
++) {
523 DPRINTF(Bus
, " found addr %#llx on default\n", addr
);
524 return defaultPortId
;
527 } else if (defaultPortId
!= Port::INVALID_PORT_ID
) {
528 DPRINTF(Bus
, "Unable to find destination for addr %#llx, "
529 "will use default port\n", addr
);
530 return defaultPortId
;
533 // we should use the range for the default port and it did not
534 // match, or the default port is not set
535 fatal("Unable to find destination for addr %#llx on bus %s\n", addr
,
540 Bus::recvAtomic(PacketPtr pkt
)
542 DPRINTF(Bus
, "recvAtomic: packet src %s addr 0x%x cmd %s\n",
543 slavePorts
[pkt
->getSrc()]->name(), pkt
->getAddr(),
546 // forward to all snoopers but the source
547 std::pair
<MemCmd
, Tick
> snoop_result
= forwardAtomic(pkt
, pkt
->getSrc());
548 MemCmd snoop_response_cmd
= snoop_result
.first
;
549 Tick snoop_response_latency
= snoop_result
.second
;
551 // even if we had a snoop response, we must continue and also
552 // perform the actual request at the destination
553 int dest_id
= findPort(pkt
->getAddr());
555 // forward the request to the appropriate destination
556 Tick response_latency
= masterPorts
[dest_id
]->sendAtomic(pkt
);
558 // if we got a response from a snooper, restore it here
559 if (snoop_response_cmd
!= MemCmd::InvalidCmd
) {
560 // no one else should have responded
561 assert(!pkt
->isResponse());
562 pkt
->cmd
= snoop_response_cmd
;
563 response_latency
= snoop_response_latency
;
566 pkt
->finishTime
= curTick() + response_latency
;
567 return response_latency
;
571 Bus::recvAtomicSnoop(PacketPtr pkt
)
573 DPRINTF(Bus
, "recvAtomicSnoop: packet src %s addr 0x%x cmd %s\n",
574 masterPorts
[pkt
->getSrc()]->name(), pkt
->getAddr(),
577 // forward to all snoopers
578 std::pair
<MemCmd
, Tick
> snoop_result
=
579 forwardAtomic(pkt
, Port::INVALID_PORT_ID
);
580 MemCmd snoop_response_cmd
= snoop_result
.first
;
581 Tick snoop_response_latency
= snoop_result
.second
;
583 if (snoop_response_cmd
!= MemCmd::InvalidCmd
)
584 pkt
->cmd
= snoop_response_cmd
;
586 pkt
->finishTime
= curTick() + snoop_response_latency
;
587 return snoop_response_latency
;
590 std::pair
<MemCmd
, Tick
>
591 Bus::forwardAtomic(PacketPtr pkt
, int exclude_slave_port_id
)
593 // the packet may be changed on snoops, record the original source
594 // and command to enable us to restore it between snoops so that
595 // additional snoops can take place properly
596 Packet::NodeID orig_src_id
= pkt
->getSrc();
597 MemCmd orig_cmd
= pkt
->cmd
;
598 MemCmd snoop_response_cmd
= MemCmd::InvalidCmd
;
599 Tick snoop_response_latency
= 0;
601 for (SlavePortIter s
= snoopPorts
.begin(); s
!= snoopPorts
.end(); ++s
) {
603 // we could have gotten this request from a snooping master
604 // (corresponding to our own slave port that is also in
605 // snoopPorts) and should not send it back to where it came
607 if (exclude_slave_port_id
== Port::INVALID_PORT_ID
||
608 p
->getId() != exclude_slave_port_id
) {
609 Tick latency
= p
->sendAtomicSnoop(pkt
);
610 // in contrast to a functional access, we have to keep on
611 // going as all snoopers must be updated even if we get a
613 if (pkt
->isResponse()) {
614 // response from snoop agent
615 assert(pkt
->cmd
!= orig_cmd
);
616 assert(pkt
->memInhibitAsserted());
617 // should only happen once
618 assert(snoop_response_cmd
== MemCmd::InvalidCmd
);
619 // save response state
620 snoop_response_cmd
= pkt
->cmd
;
621 snoop_response_latency
= latency
;
622 // restore original packet state for remaining snoopers
624 pkt
->setSrc(orig_src_id
);
630 // the packet is restored as part of the loop and any potential
631 // snoop response is part of the returned pair
632 return std::make_pair(snoop_response_cmd
, snoop_response_latency
);
636 Bus::recvFunctional(PacketPtr pkt
)
638 if (!pkt
->isPrint()) {
639 // don't do DPRINTFs on PrintReq as it clutters up the output
641 "recvFunctional: packet src %s addr 0x%x cmd %s\n",
642 slavePorts
[pkt
->getSrc()]->name(), pkt
->getAddr(),
646 // forward to all snoopers but the source
647 forwardFunctional(pkt
, pkt
->getSrc());
649 // there is no need to continue if the snooping has found what we
650 // were looking for and the packet is already a response
651 if (!pkt
->isResponse()) {
652 int dest_id
= findPort(pkt
->getAddr());
654 masterPorts
[dest_id
]->sendFunctional(pkt
);
659 Bus::recvFunctionalSnoop(PacketPtr pkt
)
661 if (!pkt
->isPrint()) {
662 // don't do DPRINTFs on PrintReq as it clutters up the output
664 "recvFunctionalSnoop: packet src %s addr 0x%x cmd %s\n",
665 masterPorts
[pkt
->getSrc()]->name(), pkt
->getAddr(),
669 // forward to all snoopers
670 forwardFunctional(pkt
, Port::INVALID_PORT_ID
);
674 Bus::forwardFunctional(PacketPtr pkt
, int exclude_slave_port_id
)
676 for (SlavePortIter s
= snoopPorts
.begin(); s
!= snoopPorts
.end(); ++s
) {
678 // we could have gotten this request from a snooping master
679 // (corresponding to our own slave port that is also in
680 // snoopPorts) and should not send it back to where it came
682 if (exclude_slave_port_id
== Port::INVALID_PORT_ID
||
683 p
->getId() != exclude_slave_port_id
)
684 p
->sendFunctionalSnoop(pkt
);
686 // if we get a response we are done
687 if (pkt
->isResponse()) {
693 /** Function called by the port when the bus is receiving a range change.*/
695 Bus::recvRangeChange(Port::PortId id
)
697 AddrRangeList ranges
;
700 if (inRecvRangeChange
.count(id
))
702 inRecvRangeChange
.insert(id
);
704 DPRINTF(BusAddrRanges
, "received RangeChange from device id %d\n", id
);
707 if (id
== defaultPortId
) {
708 defaultRange
.clear();
709 // Only try to update these ranges if the user set a default responder.
710 if (useDefaultRange
) {
711 AddrRangeList ranges
=
712 masterPorts
[id
]->getSlavePort().getAddrRanges();
713 for(iter
= ranges
.begin(); iter
!= ranges
.end(); iter
++) {
714 defaultRange
.push_back(*iter
);
715 DPRINTF(BusAddrRanges
, "Adding range %#llx - %#llx for default range\n",
716 iter
->start
, iter
->end
);
721 assert(id
< masterPorts
.size() && id
>= 0);
722 MasterPort
*port
= masterPorts
[id
];
724 // Clean out any previously existent ids
725 for (PortIter portIter
= portMap
.begin();
726 portIter
!= portMap
.end(); ) {
727 if (portIter
->second
== id
)
728 portMap
.erase(portIter
++);
733 ranges
= port
->getSlavePort().getAddrRanges();
735 for (iter
= ranges
.begin(); iter
!= ranges
.end(); iter
++) {
736 DPRINTF(BusAddrRanges
, "Adding range %#llx - %#llx for id %d\n",
737 iter
->start
, iter
->end
, id
);
738 if (portMap
.insert(*iter
, id
) == portMap
.end()) {
739 int conflict_id
= portMap
.find(*iter
)->second
;
740 fatal("%s has two ports with same range:\n\t%s\n\t%s\n",
741 name(), masterPorts
[id
]->getSlavePort().name(),
742 masterPorts
[conflict_id
]->getSlavePort().name());
746 DPRINTF(BusAddrRanges
, "port list has %d entries\n", portMap
.size());
748 // tell all our neighbouring master ports that our address range
750 for (SlavePortConstIter p
= slavePorts
.begin(); p
!= slavePorts
.end();
752 (*p
)->sendRangeChange();
754 inRecvRangeChange
.erase(id
);
758 Bus::getAddrRanges(Port::PortId id
)
760 AddrRangeList ranges
;
762 DPRINTF(BusAddrRanges
, "received address range request, returning:\n");
764 for (AddrRangeIter dflt_iter
= defaultRange
.begin();
765 dflt_iter
!= defaultRange
.end(); dflt_iter
++) {
766 ranges
.push_back(*dflt_iter
);
767 DPRINTF(BusAddrRanges
, " -- Dflt: %#llx : %#llx\n",dflt_iter
->start
,
770 for (PortIter portIter
= portMap
.begin();
771 portIter
!= portMap
.end(); portIter
++) {
773 for (AddrRangeIter dflt_iter
= defaultRange
.begin();
774 dflt_iter
!= defaultRange
.end(); dflt_iter
++) {
775 if ((portIter
->first
.start
< dflt_iter
->start
&&
776 portIter
->first
.end
>= dflt_iter
->start
) ||
777 (portIter
->first
.start
< dflt_iter
->end
&&
778 portIter
->first
.end
>= dflt_iter
->end
))
779 fatal("Devices can not set ranges that itersect the default set\
780 but are not a subset of the default set.\n");
781 if (portIter
->first
.start
>= dflt_iter
->start
&&
782 portIter
->first
.end
<= dflt_iter
->end
) {
784 DPRINTF(BusAddrRanges
, " -- %#llx : %#llx is a SUBSET\n",
785 portIter
->first
.start
, portIter
->first
.end
);
788 if (portIter
->second
!= id
&& !subset
) {
789 ranges
.push_back(portIter
->first
);
790 DPRINTF(BusAddrRanges
, " -- %#llx : %#llx\n",
791 portIter
->first
.start
, portIter
->first
.end
);
799 Bus::isSnooping(Port::PortId id
) const
801 // in essence, answer the question if there are snooping ports
802 return !snoopPorts
.empty();
806 Bus::findBlockSize(Port::PortId id
)
808 if (cachedBlockSizeValid
)
809 return cachedBlockSize
;
813 PortIter p_end
= portMap
.end();
814 for (PortIter p_iter
= portMap
.begin(); p_iter
!= p_end
; p_iter
++) {
815 unsigned tmp_bs
= masterPorts
[p_iter
->second
]->peerBlockSize();
820 for (SlavePortConstIter s
= snoopPorts
.begin(); s
!= snoopPorts
.end();
822 unsigned tmp_bs
= (*s
)->peerBlockSize();
827 max_bs
= defaultBlockSize
;
830 warn_once("Blocksize found to not be 64... hmm... probably not.\n");
831 cachedBlockSize
= max_bs
;
832 cachedBlockSizeValid
= true;
838 Bus::drain(Event
* de
)
840 //We should check that we're not "doing" anything, and that noone is
841 //waiting. We might be idle but have someone waiting if the device we
842 //contacted for a retry didn't actually retry.
843 if (!retryList
.empty() || (curTick() < tickNextIdle
&&
844 busIdleEvent
.scheduled())) {
854 if (tickNextIdle
< curTick())
855 tickNextIdle
= (curTick() / clock
) * clock
+ clock
;
861 return new Bus(this);