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
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10 * terms below provided that you ensure that this notice is replicated
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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(InvalidPortID
),
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 // uncacheable requests need never be snooped
221 if (!pkt
->req
->isUncacheable()) {
222 // the packet is a memory-mapped request and should be
223 // broadcasted to our snoopers but the source
224 forwardTiming(pkt
, pkt
->getSrc());
227 // remember if we add an outstanding req so we can undo it if
228 // necessary, if the packet needs a response, we should add it
229 // as outstanding and express snoops never fail so there is
230 // not need to worry about them
231 bool add_outstanding
= !pkt
->isExpressSnoop() && pkt
->needsResponse();
233 // keep track that we have an outstanding request packet
234 // matching this request, this is used by the coherency
235 // mechanism in determining what to do with snoop responses
236 // (in recvTimingSnoop)
237 if (add_outstanding
) {
238 // we should never have an exsiting request outstanding
239 assert(outstandingReq
.find(pkt
->req
) == outstandingReq
.end());
240 outstandingReq
.insert(pkt
->req
);
243 // since it is a normal request, determine the destination
244 // based on the address and attempt to send the packet
245 bool success
= masterPorts
[findPort(pkt
->getAddr())]->sendTimingReq(pkt
);
248 // inhibited packets should never be forced to retry
249 assert(!pkt
->memInhibitAsserted());
251 // if it was added as outstanding and the send failed, then
254 outstandingReq
.erase(pkt
->req
);
256 DPRINTF(Bus
, "recvTimingReq: src %s %s 0x%x RETRY\n",
257 src_port
->name(), pkt
->cmdString(), pkt
->getAddr());
259 addToRetryList(src_port
);
260 occupyBus(headerFinishTime
);
265 succeededTiming(packetFinishTime
);
271 Bus::recvTimingResp(PacketPtr pkt
)
273 // determine the source port based on the id
274 MasterPort
*src_port
= masterPorts
[pkt
->getSrc()];
276 // test if the bus should be considered occupied for the current
278 if (isOccupied(pkt
, src_port
)) {
279 DPRINTF(Bus
, "recvTimingResp: src %s %s 0x%x BUSY\n",
280 src_port
->name(), pkt
->cmdString(), pkt
->getAddr());
284 DPRINTF(Bus
, "recvTimingResp: src %s %s 0x%x\n",
285 src_port
->name(), pkt
->cmdString(), pkt
->getAddr());
287 calcPacketTiming(pkt
);
288 Tick packetFinishTime
= pkt
->finishTime
;
290 // the packet is a normal response to a request that we should
291 // have seen passing through the bus
292 assert(outstandingReq
.find(pkt
->req
) != outstandingReq
.end());
294 // remove it as outstanding
295 outstandingReq
.erase(pkt
->req
);
297 // send the packet to the destination through one of our slave
298 // ports, as determined by the destination field
299 bool success M5_VAR_USED
= slavePorts
[pkt
->getDest()]->sendTimingResp(pkt
);
301 // currently it is illegal to block responses... can lead to
305 succeededTiming(packetFinishTime
);
311 Bus::recvTimingSnoopReq(PacketPtr pkt
)
313 DPRINTF(Bus
, "recvTimingSnoopReq: src %s %s 0x%x\n",
314 masterPorts
[pkt
->getSrc()]->name(), pkt
->cmdString(),
317 // we should only see express snoops from caches
318 assert(pkt
->isExpressSnoop());
320 // forward to all snoopers
321 forwardTiming(pkt
, InvalidPortID
);
323 // a snoop request came from a connected slave device (one of
324 // our master ports), and if it is not coming from the slave
325 // device responsible for the address range something is
326 // wrong, hence there is nothing further to do as the packet
327 // would be going back to where it came from
328 assert(pkt
->getSrc() == findPort(pkt
->getAddr()));
330 // this is an express snoop and is never forced to retry
335 Bus::recvTimingSnoopResp(PacketPtr pkt
)
337 // determine the source port based on the id
338 SlavePort
* src_port
= slavePorts
[pkt
->getSrc()];
340 if (isOccupied(pkt
, src_port
)) {
341 DPRINTF(Bus
, "recvTimingSnoopResp: src %s %s 0x%x BUSY\n",
342 src_port
->name(), pkt
->cmdString(), pkt
->getAddr());
346 DPRINTF(Bus
, "recvTimingSnoop: src %s %s 0x%x\n",
347 src_port
->name(), pkt
->cmdString(), pkt
->getAddr());
349 // get the destination from the packet
350 PortID dest
= pkt
->getDest();
352 // responses are never express snoops
353 assert(!pkt
->isExpressSnoop());
355 calcPacketTiming(pkt
);
356 Tick packetFinishTime
= pkt
->finishTime
;
358 // determine if the response is from a snoop request we
359 // created as the result of a normal request (in which case it
360 // should be in the outstandingReq), or if we merely forwarded
361 // someone else's snoop request
362 if (outstandingReq
.find(pkt
->req
) == outstandingReq
.end()) {
363 // this is a snoop response to a snoop request we
364 // forwarded, e.g. coming from the L1 and going to the L2
365 // this should be forwarded as a snoop response
366 bool success M5_VAR_USED
= masterPorts
[dest
]->sendTimingSnoopResp(pkt
);
369 // we got a snoop response on one of our slave ports,
370 // i.e. from a coherent master connected to the bus, and
371 // since we created the snoop request as part of
372 // recvTiming, this should now be a normal response again
373 outstandingReq
.erase(pkt
->req
);
375 // this is a snoop response from a coherent master, with a
376 // destination field set on its way through the bus as
377 // request, hence it should never go back to where the
378 // snoop response came from, but instead to where the
379 // original request came from
380 assert(pkt
->getSrc() != dest
);
382 // as a normal response, it should go back to a master
383 // through one of our slave ports
384 bool success M5_VAR_USED
= slavePorts
[dest
]->sendTimingResp(pkt
);
386 // currently it is illegal to block responses... can lead
391 succeededTiming(packetFinishTime
);
398 Bus::succeededTiming(Tick busy_time
)
400 // occupy the bus accordingly
401 occupyBus(busy_time
);
403 // if a retrying port succeeded, also take it off the retry list
405 DPRINTF(Bus
, "Remove retry from list %s\n",
406 retryList
.front()->name());
407 retryList
.pop_front();
413 Bus::forwardTiming(PacketPtr pkt
, PortID exclude_slave_port_id
)
415 for (SlavePortIter s
= snoopPorts
.begin(); s
!= snoopPorts
.end(); ++s
) {
417 // we could have gotten this request from a snooping master
418 // (corresponding to our own slave port that is also in
419 // snoopPorts) and should not send it back to where it came
421 if (exclude_slave_port_id
== InvalidPortID
||
422 p
->getId() != exclude_slave_port_id
) {
423 // cache is not allowed to refuse snoop
424 p
->sendTimingSnoopReq(pkt
);
432 // releasing the bus means we should now be idle
433 assert(curTick() >= tickNextIdle
);
435 // bus is now idle, so if someone is waiting we can retry
436 if (!retryList
.empty()) {
437 // note that we block (return false on recvTiming) both
438 // because the bus is busy and because the destination is
439 // busy, and in the latter case the bus may be released before
440 // we see a retry from the destination
444 //If we weren't able to drain before, we might be able to now.
445 if (drainEvent
&& retryList
.empty() && curTick() >= tickNextIdle
) {
446 drainEvent
->process();
447 // Clear the drain event once we're done with it.
455 // this should never be called with an empty retry list
456 assert(!retryList
.empty());
458 // send a retry to the port at the head of the retry list
461 // note that we might have blocked on the receiving port being
462 // busy (rather than the bus itself) and now call retry before the
463 // destination called retry on the bus
464 retryList
.front()->sendRetry();
466 // If inRetry is still true, sendTiming wasn't called in zero time
467 // (e.g. the cache does this)
469 retryList
.pop_front();
472 //Bring tickNextIdle up to the present
473 while (tickNextIdle
< curTick())
474 tickNextIdle
+= clock
;
476 //Burn a cycle for the missed grant.
477 tickNextIdle
+= clock
;
479 reschedule(busIdleEvent
, tickNextIdle
, true);
484 Bus::recvRetry(PortID id
)
486 // we got a retry from a peer that we tried to send something to
487 // and failed, but we sent it on the account of someone else, and
488 // that source port should be on our retry list, however if the
489 // bus is released before this happens and the retry (from the bus
490 // point of view) is successful then this no longer holds and we
491 // could in fact have an empty retry list
492 if (retryList
.empty())
495 // if the bus isn't busy
496 if (curTick() >= tickNextIdle
) {
497 // note that we do not care who told us to retry at the moment, we
498 // merely let the first one on the retry list go
504 Bus::findPort(Addr addr
)
506 /* An interval tree would be a better way to do this. --ali. */
507 PortID dest_id
= checkPortCache(addr
);
508 if (dest_id
!= InvalidPortID
)
511 // Check normal port ranges
512 PortIter i
= portMap
.find(RangeSize(addr
,1));
513 if (i
!= portMap
.end()) {
515 updatePortCache(dest_id
, i
->first
.start
, i
->first
.end
);
519 // Check if this matches the default range
520 if (useDefaultRange
) {
521 AddrRangeIter a_end
= defaultRange
.end();
522 for (AddrRangeIter i
= defaultRange
.begin(); i
!= a_end
; i
++) {
524 DPRINTF(Bus
, " found addr %#llx on default\n", addr
);
525 return defaultPortID
;
528 } else if (defaultPortID
!= InvalidPortID
) {
529 DPRINTF(Bus
, "Unable to find destination for addr %#llx, "
530 "will use default port\n", addr
);
531 return defaultPortID
;
534 // we should use the range for the default port and it did not
535 // match, or the default port is not set
536 fatal("Unable to find destination for addr %#llx on bus %s\n", addr
,
541 Bus::recvAtomic(PacketPtr pkt
)
543 DPRINTF(Bus
, "recvAtomic: packet src %s addr 0x%x cmd %s\n",
544 slavePorts
[pkt
->getSrc()]->name(), pkt
->getAddr(),
547 MemCmd snoop_response_cmd
= MemCmd::InvalidCmd
;
548 Tick snoop_response_latency
= 0;
550 // uncacheable requests need never be snooped
551 if (!pkt
->req
->isUncacheable()) {
552 // forward to all snoopers but the source
553 std::pair
<MemCmd
, Tick
> snoop_result
=
554 forwardAtomic(pkt
, pkt
->getSrc());
555 snoop_response_cmd
= snoop_result
.first
;
556 snoop_response_latency
= snoop_result
.second
;
559 // even if we had a snoop response, we must continue and also
560 // perform the actual request at the destination
561 PortID dest_id
= findPort(pkt
->getAddr());
563 // forward the request to the appropriate destination
564 Tick response_latency
= masterPorts
[dest_id
]->sendAtomic(pkt
);
566 // if we got a response from a snooper, restore it here
567 if (snoop_response_cmd
!= MemCmd::InvalidCmd
) {
568 // no one else should have responded
569 assert(!pkt
->isResponse());
570 pkt
->cmd
= snoop_response_cmd
;
571 response_latency
= snoop_response_latency
;
574 pkt
->finishTime
= curTick() + response_latency
;
575 return response_latency
;
579 Bus::recvAtomicSnoop(PacketPtr pkt
)
581 DPRINTF(Bus
, "recvAtomicSnoop: packet src %s addr 0x%x cmd %s\n",
582 masterPorts
[pkt
->getSrc()]->name(), pkt
->getAddr(),
585 // forward to all snoopers
586 std::pair
<MemCmd
, Tick
> snoop_result
=
587 forwardAtomic(pkt
, InvalidPortID
);
588 MemCmd snoop_response_cmd
= snoop_result
.first
;
589 Tick snoop_response_latency
= snoop_result
.second
;
591 if (snoop_response_cmd
!= MemCmd::InvalidCmd
)
592 pkt
->cmd
= snoop_response_cmd
;
594 pkt
->finishTime
= curTick() + snoop_response_latency
;
595 return snoop_response_latency
;
598 std::pair
<MemCmd
, Tick
>
599 Bus::forwardAtomic(PacketPtr pkt
, PortID exclude_slave_port_id
)
601 // the packet may be changed on snoops, record the original source
602 // and command to enable us to restore it between snoops so that
603 // additional snoops can take place properly
604 PortID orig_src_id
= pkt
->getSrc();
605 MemCmd orig_cmd
= pkt
->cmd
;
606 MemCmd snoop_response_cmd
= MemCmd::InvalidCmd
;
607 Tick snoop_response_latency
= 0;
609 for (SlavePortIter s
= snoopPorts
.begin(); s
!= snoopPorts
.end(); ++s
) {
611 // we could have gotten this request from a snooping master
612 // (corresponding to our own slave port that is also in
613 // snoopPorts) and should not send it back to where it came
615 if (exclude_slave_port_id
== InvalidPortID
||
616 p
->getId() != exclude_slave_port_id
) {
617 Tick latency
= p
->sendAtomicSnoop(pkt
);
618 // in contrast to a functional access, we have to keep on
619 // going as all snoopers must be updated even if we get a
621 if (pkt
->isResponse()) {
622 // response from snoop agent
623 assert(pkt
->cmd
!= orig_cmd
);
624 assert(pkt
->memInhibitAsserted());
625 // should only happen once
626 assert(snoop_response_cmd
== MemCmd::InvalidCmd
);
627 // save response state
628 snoop_response_cmd
= pkt
->cmd
;
629 snoop_response_latency
= latency
;
630 // restore original packet state for remaining snoopers
632 pkt
->setSrc(orig_src_id
);
638 // the packet is restored as part of the loop and any potential
639 // snoop response is part of the returned pair
640 return std::make_pair(snoop_response_cmd
, snoop_response_latency
);
644 Bus::recvFunctional(PacketPtr pkt
)
646 if (!pkt
->isPrint()) {
647 // don't do DPRINTFs on PrintReq as it clutters up the output
649 "recvFunctional: packet src %s addr 0x%x cmd %s\n",
650 slavePorts
[pkt
->getSrc()]->name(), pkt
->getAddr(),
654 // uncacheable requests need never be snooped
655 if (!pkt
->req
->isUncacheable()) {
656 // forward to all snoopers but the source
657 forwardFunctional(pkt
, pkt
->getSrc());
660 // there is no need to continue if the snooping has found what we
661 // were looking for and the packet is already a response
662 if (!pkt
->isResponse()) {
663 PortID dest_id
= findPort(pkt
->getAddr());
665 masterPorts
[dest_id
]->sendFunctional(pkt
);
670 Bus::recvFunctionalSnoop(PacketPtr pkt
)
672 if (!pkt
->isPrint()) {
673 // don't do DPRINTFs on PrintReq as it clutters up the output
675 "recvFunctionalSnoop: packet src %s addr 0x%x cmd %s\n",
676 masterPorts
[pkt
->getSrc()]->name(), pkt
->getAddr(),
680 // forward to all snoopers
681 forwardFunctional(pkt
, InvalidPortID
);
685 Bus::forwardFunctional(PacketPtr pkt
, PortID exclude_slave_port_id
)
687 for (SlavePortIter s
= snoopPorts
.begin(); s
!= snoopPorts
.end(); ++s
) {
689 // we could have gotten this request from a snooping master
690 // (corresponding to our own slave port that is also in
691 // snoopPorts) and should not send it back to where it came
693 if (exclude_slave_port_id
== InvalidPortID
||
694 p
->getId() != exclude_slave_port_id
)
695 p
->sendFunctionalSnoop(pkt
);
697 // if we get a response we are done
698 if (pkt
->isResponse()) {
704 /** Function called by the port when the bus is receiving a range change.*/
706 Bus::recvRangeChange(PortID id
)
708 AddrRangeList ranges
;
711 if (inRecvRangeChange
.count(id
))
713 inRecvRangeChange
.insert(id
);
715 DPRINTF(BusAddrRanges
, "received RangeChange from device id %d\n", id
);
718 if (id
== defaultPortID
) {
719 defaultRange
.clear();
720 // Only try to update these ranges if the user set a default responder.
721 if (useDefaultRange
) {
722 AddrRangeList ranges
=
723 masterPorts
[id
]->getSlavePort().getAddrRanges();
724 for(iter
= ranges
.begin(); iter
!= ranges
.end(); iter
++) {
725 defaultRange
.push_back(*iter
);
726 DPRINTF(BusAddrRanges
, "Adding range %#llx - %#llx for default range\n",
727 iter
->start
, iter
->end
);
732 assert(id
< masterPorts
.size() && id
>= 0);
733 MasterPort
*port
= masterPorts
[id
];
735 // Clean out any previously existent ids
736 for (PortIter portIter
= portMap
.begin();
737 portIter
!= portMap
.end(); ) {
738 if (portIter
->second
== id
)
739 portMap
.erase(portIter
++);
744 ranges
= port
->getSlavePort().getAddrRanges();
746 for (iter
= ranges
.begin(); iter
!= ranges
.end(); iter
++) {
747 DPRINTF(BusAddrRanges
, "Adding range %#llx - %#llx for id %d\n",
748 iter
->start
, iter
->end
, id
);
749 if (portMap
.insert(*iter
, id
) == portMap
.end()) {
750 PortID conflict_id
= portMap
.find(*iter
)->second
;
751 fatal("%s has two ports with same range:\n\t%s\n\t%s\n",
752 name(), masterPorts
[id
]->getSlavePort().name(),
753 masterPorts
[conflict_id
]->getSlavePort().name());
757 DPRINTF(BusAddrRanges
, "port list has %d entries\n", portMap
.size());
759 // tell all our neighbouring master ports that our address range
761 for (SlavePortConstIter p
= slavePorts
.begin(); p
!= slavePorts
.end();
763 (*p
)->sendRangeChange();
765 inRecvRangeChange
.erase(id
);
769 Bus::getAddrRanges(PortID id
)
771 AddrRangeList ranges
;
773 DPRINTF(BusAddrRanges
, "received address range request, returning:\n");
775 for (AddrRangeIter dflt_iter
= defaultRange
.begin();
776 dflt_iter
!= defaultRange
.end(); dflt_iter
++) {
777 ranges
.push_back(*dflt_iter
);
778 DPRINTF(BusAddrRanges
, " -- Dflt: %#llx : %#llx\n",dflt_iter
->start
,
781 for (PortIter portIter
= portMap
.begin();
782 portIter
!= portMap
.end(); portIter
++) {
784 for (AddrRangeIter dflt_iter
= defaultRange
.begin();
785 dflt_iter
!= defaultRange
.end(); dflt_iter
++) {
786 if ((portIter
->first
.start
< dflt_iter
->start
&&
787 portIter
->first
.end
>= dflt_iter
->start
) ||
788 (portIter
->first
.start
< dflt_iter
->end
&&
789 portIter
->first
.end
>= dflt_iter
->end
))
790 fatal("Devices can not set ranges that itersect the default set\
791 but are not a subset of the default set.\n");
792 if (portIter
->first
.start
>= dflt_iter
->start
&&
793 portIter
->first
.end
<= dflt_iter
->end
) {
795 DPRINTF(BusAddrRanges
, " -- %#llx : %#llx is a SUBSET\n",
796 portIter
->first
.start
, portIter
->first
.end
);
799 if (portIter
->second
!= id
&& !subset
) {
800 ranges
.push_back(portIter
->first
);
801 DPRINTF(BusAddrRanges
, " -- %#llx : %#llx\n",
802 portIter
->first
.start
, portIter
->first
.end
);
810 Bus::isSnooping(PortID id
) const
812 // in essence, answer the question if there are snooping ports
813 return !snoopPorts
.empty();
817 Bus::findBlockSize(PortID id
)
819 if (cachedBlockSizeValid
)
820 return cachedBlockSize
;
824 PortIter p_end
= portMap
.end();
825 for (PortIter p_iter
= portMap
.begin(); p_iter
!= p_end
; p_iter
++) {
826 unsigned tmp_bs
= masterPorts
[p_iter
->second
]->peerBlockSize();
831 for (SlavePortConstIter s
= snoopPorts
.begin(); s
!= snoopPorts
.end();
833 unsigned tmp_bs
= (*s
)->peerBlockSize();
838 max_bs
= defaultBlockSize
;
841 warn_once("Blocksize found to not be 64... hmm... probably not.\n");
842 cachedBlockSize
= max_bs
;
843 cachedBlockSizeValid
= true;
849 Bus::drain(Event
* de
)
851 //We should check that we're not "doing" anything, and that noone is
852 //waiting. We might be idle but have someone waiting if the device we
853 //contacted for a retry didn't actually retry.
854 if (!retryList
.empty() || (curTick() < tickNextIdle
&&
855 busIdleEvent
.scheduled())) {
865 if (tickNextIdle
< curTick())
866 tickNextIdle
= (curTick() / clock
) * clock
+ clock
;
872 return new Bus(this);