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
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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(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 BusMasterPort
* 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 BusMasterPort
* 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 BusSlavePort
* 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 std::vector
<BusSlavePort
*>::iterator p
;
130 // iterate over our slave ports and determine which of our
131 // neighbouring master ports are snooping and add them as snoopers
132 for (p
= slavePorts
.begin(); p
!= slavePorts
.end(); ++p
) {
133 if ((*p
)->getMasterPort().isSnooping()) {
134 DPRINTF(BusAddrRanges
, "Adding snooping neighbour %s\n",
135 (*p
)->getMasterPort().name());
136 snoopPorts
.push_back(*p
);
142 Bus::calcPacketTiming(PacketPtr pkt
)
144 // determine the current time rounded to the closest following
146 Tick now
= curTick();
147 if (now
% clock
!= 0) {
148 now
= ((now
/ clock
) + 1) * clock
;
151 Tick headerTime
= now
+ headerCycles
* clock
;
153 // The packet will be sent. Figure out how long it occupies the bus, and
154 // how much of that time is for the first "word", aka bus width.
156 if (pkt
->hasData()) {
157 // If a packet has data, it needs ceil(size/width) cycles to send it
158 int dataSize
= pkt
->getSize();
159 numCycles
+= dataSize
/width
;
160 if (dataSize
% width
)
164 // The first word will be delivered after the current tick, the delivery
165 // of the address if any, and one bus cycle to deliver the data
166 pkt
->firstWordTime
= headerTime
+ clock
;
168 pkt
->finishTime
= headerTime
+ numCycles
* clock
;
173 void Bus::occupyBus(Tick until
)
176 // shortcut for express snoop packets
180 tickNextIdle
= until
;
181 reschedule(busIdleEvent
, tickNextIdle
, true);
183 DPRINTF(Bus
, "The bus is now occupied from tick %d to %d\n",
184 curTick(), tickNextIdle
);
188 Bus::isOccupied(PacketPtr pkt
, Port
* port
)
190 // first we see if the next idle tick is in the future, next the
191 // bus is considered occupied if there are ports on the retry list
192 // and we are not in a retry with the current port
193 if (tickNextIdle
> curTick() ||
194 (!retryList
.empty() && !(inRetry
&& port
== retryList
.front()))) {
195 addToRetryList(port
);
202 Bus::recvTiming(PacketPtr pkt
)
205 Packet::NodeID src_id
= pkt
->getSrc();
207 // determine the source port based on the id and direction
208 Port
*src_port
= NULL
;
209 if (pkt
->isRequest())
210 src_port
= slavePorts
[src_id
];
212 src_port
= masterPorts
[src_id
];
214 // test if the bus should be considered occupied for the current
215 // packet, and exclude express snoops from the check
216 if (!pkt
->isExpressSnoop() && isOccupied(pkt
, src_port
)) {
217 DPRINTF(Bus
, "recvTiming: src %s %s 0x%x BUSY\n",
218 src_port
->name(), pkt
->cmdString(), pkt
->getAddr());
222 DPRINTF(Bus
, "recvTiming: src %s %s 0x%x\n",
223 src_port
->name(), pkt
->cmdString(), pkt
->getAddr());
225 Tick headerFinishTime
= pkt
->isExpressSnoop() ? 0 : calcPacketTiming(pkt
);
226 Tick packetFinishTime
= pkt
->isExpressSnoop() ? 0 : pkt
->finishTime
;
228 // decide what to do based on the direction
229 if (pkt
->isRequest()) {
230 // the packet is a memory-mapped request and should be
231 // broadcasted to our snoopers but the source
232 forwardTiming(pkt
, src_id
);
234 // remember if we add an outstanding req so we can undo it if
235 // necessary, if the packet needs a response, we should add it
236 // as outstanding and express snoops never fail so there is
237 // not need to worry about them
238 bool add_outstanding
= !pkt
->isExpressSnoop() && pkt
->needsResponse();
240 // keep track that we have an outstanding request packet
241 // matching this request, this is used by the coherency
242 // mechanism in determining what to do with snoop responses
243 // (in recvTimingSnoop)
244 if (add_outstanding
) {
245 // we should never have an exsiting request outstanding
246 assert(outstandingReq
.find(pkt
->req
) == outstandingReq
.end());
247 outstandingReq
.insert(pkt
->req
);
250 // since it is a normal request, determine the destination
251 // based on the address and attempt to send the packet
252 bool success
= masterPorts
[findPort(pkt
->getAddr())]->sendTiming(pkt
);
255 // inhibited packets should never be forced to retry
256 assert(!pkt
->memInhibitAsserted());
258 // if it was added as outstanding and the send failed, then
261 outstandingReq
.erase(pkt
->req
);
263 DPRINTF(Bus
, "recvTiming: src %s %s 0x%x RETRY\n",
264 src_port
->name(), pkt
->cmdString(), pkt
->getAddr());
266 addToRetryList(src_port
);
267 occupyBus(headerFinishTime
);
272 // the packet is a normal response to a request that we should
273 // have seen passing through the bus
274 assert(outstandingReq
.find(pkt
->req
) != outstandingReq
.end());
276 // remove it as outstanding
277 outstandingReq
.erase(pkt
->req
);
279 // send the packet to the destination through one of our slave
280 // ports, as determined by the destination field
281 bool success M5_VAR_USED
= slavePorts
[pkt
->getDest()]->sendTiming(pkt
);
283 // currently it is illegal to block responses... can lead to
288 succeededTiming(packetFinishTime
);
294 Bus::recvTimingSnoop(PacketPtr pkt
)
297 Packet::NodeID src_id
= pkt
->getSrc();
299 if (pkt
->isRequest()) {
300 DPRINTF(Bus
, "recvTimingSnoop: src %d %s 0x%x\n",
301 src_id
, pkt
->cmdString(), pkt
->getAddr());
303 // the packet is an express snoop request and should be
304 // broadcasted to our snoopers
305 assert(pkt
->isExpressSnoop());
307 // forward to all snoopers
308 forwardTiming(pkt
, Port::INVALID_PORT_ID
);
310 // a snoop request came from a connected slave device (one of
311 // our master ports), and if it is not coming from the slave
312 // device responsible for the address range something is
313 // wrong, hence there is nothing further to do as the packet
314 // would be going back to where it came from
315 assert(src_id
== findPort(pkt
->getAddr()));
317 // this is an express snoop and is never forced to retry
322 // determine the source port based on the id
323 SlavePort
* src_port
= slavePorts
[src_id
];
325 if (isOccupied(pkt
, src_port
)) {
326 DPRINTF(Bus
, "recvTimingSnoop: src %s %s 0x%x BUSY\n",
327 src_port
->name(), pkt
->cmdString(), pkt
->getAddr());
331 DPRINTF(Bus
, "recvTimingSnoop: src %s %s 0x%x\n",
332 src_port
->name(), pkt
->cmdString(), pkt
->getAddr());
334 // get the destination from the packet
335 Packet::NodeID dest
= pkt
->getDest();
337 // responses are never express snoops
338 assert(!pkt
->isExpressSnoop());
340 calcPacketTiming(pkt
);
341 Tick packetFinishTime
= pkt
->finishTime
;
343 // determine if the response is from a snoop request we
344 // created as the result of a normal request (in which case it
345 // should be in the outstandingReq), or if we merely forwarded
346 // someone else's snoop request
347 if (outstandingReq
.find(pkt
->req
) == outstandingReq
.end()) {
348 // this is a snoop response to a snoop request we
349 // forwarded, e.g. coming from the L1 and going to the L2
350 // this should be forwarded as a snoop response
351 bool success M5_VAR_USED
= masterPorts
[dest
]->sendTimingSnoop(pkt
);
354 // we got a snoop response on one of our slave ports,
355 // i.e. from a coherent master connected to the bus, and
356 // since we created the snoop request as part of
357 // recvTiming, this should now be a normal response again
358 outstandingReq
.erase(pkt
->req
);
360 // this is a snoop response from a coherent master, with a
361 // destination field set on its way through the bus as
362 // request, hence it should never go back to where the
363 // snoop response came from, but instead to where the
364 // original request came from
365 assert(src_id
!= dest
);
367 // as a normal response, it should go back to a master
368 // through one of our slave ports
369 bool success M5_VAR_USED
= slavePorts
[dest
]->sendTiming(pkt
);
371 // currently it is illegal to block responses... can lead
376 succeededTiming(packetFinishTime
);
383 Bus::succeededTiming(Tick busy_time
)
385 // occupy the bus accordingly
386 occupyBus(busy_time
);
388 // if a retrying port succeeded, also take it off the retry list
390 DPRINTF(Bus
, "Remove retry from list %s\n",
391 retryList
.front()->name());
392 retryList
.pop_front();
398 Bus::forwardTiming(PacketPtr pkt
, int exclude_slave_port_id
)
400 SnoopIter s_end
= snoopPorts
.end();
401 for (SnoopIter s_iter
= snoopPorts
.begin(); s_iter
!= s_end
; s_iter
++) {
402 BusSlavePort
*p
= *s_iter
;
403 // we could have gotten this request from a snooping master
404 // (corresponding to our own slave port that is also in
405 // snoopPorts) and should not send it back to where it came
407 if (exclude_slave_port_id
== Port::INVALID_PORT_ID
||
408 p
->getId() != exclude_slave_port_id
) {
409 // cache is not allowed to refuse snoop
410 bool success M5_VAR_USED
= p
->sendTimingSnoop(pkt
);
419 // releasing the bus means we should now be idle
420 assert(curTick() >= tickNextIdle
);
422 // bus is now idle, so if someone is waiting we can retry
423 if (!retryList
.empty()) {
424 // note that we block (return false on recvTiming) both
425 // because the bus is busy and because the destination is
426 // busy, and in the latter case the bus may be released before
427 // we see a retry from the destination
431 //If we weren't able to drain before, we might be able to now.
432 if (drainEvent
&& retryList
.empty() && curTick() >= tickNextIdle
) {
433 drainEvent
->process();
434 // Clear the drain event once we're done with it.
442 // this should never be called with an empty retry list
443 assert(!retryList
.empty());
445 // send a retry to the port at the head of the retry list
448 // note that we might have blocked on the receiving port being
449 // busy (rather than the bus itself) and now call retry before the
450 // destination called retry on the bus
451 retryList
.front()->sendRetry();
453 // If inRetry is still true, sendTiming wasn't called in zero time
454 // (e.g. the cache does this)
456 retryList
.pop_front();
459 //Bring tickNextIdle up to the present
460 while (tickNextIdle
< curTick())
461 tickNextIdle
+= clock
;
463 //Burn a cycle for the missed grant.
464 tickNextIdle
+= clock
;
466 reschedule(busIdleEvent
, tickNextIdle
, true);
471 Bus::recvRetry(Port::PortId id
)
473 // we got a retry from a peer that we tried to send something to
474 // and failed, but we sent it on the account of someone else, and
475 // that source port should be on our retry list, however if the
476 // bus is released before this happens and the retry (from the bus
477 // point of view) is successful then this no longer holds and we
478 // could in fact have an empty retry list
479 if (retryList
.empty())
482 // if the bus isn't busy
483 if (curTick() >= tickNextIdle
) {
484 // note that we do not care who told us to retry at the moment, we
485 // merely let the first one on the retry list go
491 Bus::findPort(Addr addr
)
493 /* An interval tree would be a better way to do this. --ali. */
496 dest_id
= checkPortCache(addr
);
497 if (dest_id
!= Port::INVALID_PORT_ID
)
500 // Check normal port ranges
501 PortIter i
= portMap
.find(RangeSize(addr
,1));
502 if (i
!= portMap
.end()) {
504 updatePortCache(dest_id
, i
->first
.start
, i
->first
.end
);
508 // Check if this matches the default range
509 if (useDefaultRange
) {
510 AddrRangeIter a_end
= defaultRange
.end();
511 for (AddrRangeIter i
= defaultRange
.begin(); i
!= a_end
; i
++) {
513 DPRINTF(Bus
, " found addr %#llx on default\n", addr
);
514 return defaultPortId
;
517 } else if (defaultPortId
!= Port::INVALID_PORT_ID
) {
518 DPRINTF(Bus
, "Unable to find destination for addr %#llx, "
519 "will use default port\n", addr
);
520 return defaultPortId
;
523 // we should use the range for the default port and it did not
524 // match, or the default port is not set
525 fatal("Unable to find destination for addr %#llx on bus %s\n", addr
,
530 Bus::recvAtomic(PacketPtr pkt
)
532 DPRINTF(Bus
, "recvAtomic: packet src %s addr 0x%x cmd %s\n",
533 slavePorts
[pkt
->getSrc()]->name(), pkt
->getAddr(),
536 // we should always see a request routed based on the address
537 assert(pkt
->isRequest());
539 // forward to all snoopers but the source
540 std::pair
<MemCmd
, Tick
> snoop_result
= forwardAtomic(pkt
, pkt
->getSrc());
541 MemCmd snoop_response_cmd
= snoop_result
.first
;
542 Tick snoop_response_latency
= snoop_result
.second
;
544 // even if we had a snoop response, we must continue and also
545 // perform the actual request at the destination
546 int dest_id
= findPort(pkt
->getAddr());
548 // forward the request to the appropriate destination
549 Tick response_latency
= masterPorts
[dest_id
]->sendAtomic(pkt
);
551 // if we got a response from a snooper, restore it here
552 if (snoop_response_cmd
!= MemCmd::InvalidCmd
) {
553 // no one else should have responded
554 assert(!pkt
->isResponse());
555 pkt
->cmd
= snoop_response_cmd
;
556 response_latency
= snoop_response_latency
;
559 pkt
->finishTime
= curTick() + response_latency
;
560 return response_latency
;
564 Bus::recvAtomicSnoop(PacketPtr pkt
)
566 DPRINTF(Bus
, "recvAtomicSnoop: packet src %s addr 0x%x cmd %s\n",
567 masterPorts
[pkt
->getSrc()]->name(), pkt
->getAddr(),
570 // we should always see a request routed based on the address
571 assert(pkt
->isRequest());
573 // forward to all snoopers
574 std::pair
<MemCmd
, Tick
> snoop_result
=
575 forwardAtomic(pkt
, Port::INVALID_PORT_ID
);
576 MemCmd snoop_response_cmd
= snoop_result
.first
;
577 Tick snoop_response_latency
= snoop_result
.second
;
579 if (snoop_response_cmd
!= MemCmd::InvalidCmd
)
580 pkt
->cmd
= snoop_response_cmd
;
582 pkt
->finishTime
= curTick() + snoop_response_latency
;
583 return snoop_response_latency
;
586 std::pair
<MemCmd
, Tick
>
587 Bus::forwardAtomic(PacketPtr pkt
, int exclude_slave_port_id
)
589 // the packet may be changed on snoops, record the original source
590 // and command to enable us to restore it between snoops so that
591 // additional snoops can take place properly
592 Packet::NodeID orig_src_id
= pkt
->getSrc();
593 MemCmd orig_cmd
= pkt
->cmd
;
594 MemCmd snoop_response_cmd
= MemCmd::InvalidCmd
;
595 Tick snoop_response_latency
= 0;
597 SnoopIter s_end
= snoopPorts
.end();
598 for (SnoopIter s_iter
= snoopPorts
.begin(); s_iter
!= s_end
; s_iter
++) {
599 BusSlavePort
*p
= *s_iter
;
600 // we could have gotten this request from a snooping master
601 // (corresponding to our own slave port that is also in
602 // snoopPorts) and should not send it back to where it came
604 if (exclude_slave_port_id
== Port::INVALID_PORT_ID
||
605 p
->getId() != exclude_slave_port_id
) {
606 Tick latency
= p
->sendAtomicSnoop(pkt
);
607 // in contrast to a functional access, we have to keep on
608 // going as all snoopers must be updated even if we get a
610 if (pkt
->isResponse()) {
611 // response from snoop agent
612 assert(pkt
->cmd
!= orig_cmd
);
613 assert(pkt
->memInhibitAsserted());
614 // should only happen once
615 assert(snoop_response_cmd
== MemCmd::InvalidCmd
);
616 // save response state
617 snoop_response_cmd
= pkt
->cmd
;
618 snoop_response_latency
= latency
;
619 // restore original packet state for remaining snoopers
621 pkt
->setSrc(orig_src_id
);
627 // the packet is restored as part of the loop and any potential
628 // snoop response is part of the returned pair
629 return std::make_pair(snoop_response_cmd
, snoop_response_latency
);
633 Bus::recvFunctional(PacketPtr pkt
)
635 if (!pkt
->isPrint()) {
636 // don't do DPRINTFs on PrintReq as it clutters up the output
638 "recvFunctional: packet src %s addr 0x%x cmd %s\n",
639 slavePorts
[pkt
->getSrc()]->name(), pkt
->getAddr(),
643 // we should always see a request routed based on the address
644 assert(pkt
->isRequest());
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 // we should always see a request routed based on the address
670 assert(pkt
->isRequest());
672 // forward to all snoopers
673 forwardFunctional(pkt
, Port::INVALID_PORT_ID
);
677 Bus::forwardFunctional(PacketPtr pkt
, int exclude_slave_port_id
)
679 SnoopIter s_end
= snoopPorts
.end();
680 for (SnoopIter s_iter
= snoopPorts
.begin(); s_iter
!= s_end
; s_iter
++) {
681 BusSlavePort
*p
= *s_iter
;
682 // we could have gotten this request from a snooping master
683 // (corresponding to our own slave port that is also in
684 // snoopPorts) and should not send it back to where it came
686 if (exclude_slave_port_id
== Port::INVALID_PORT_ID
||
687 p
->getId() != exclude_slave_port_id
)
688 p
->sendFunctionalSnoop(pkt
);
690 // if we get a response we are done
691 if (pkt
->isResponse()) {
697 /** Function called by the port when the bus is receiving a range change.*/
699 Bus::recvRangeChange(Port::PortId id
)
701 AddrRangeList ranges
;
704 if (inRecvRangeChange
.count(id
))
706 inRecvRangeChange
.insert(id
);
708 DPRINTF(BusAddrRanges
, "received RangeChange from device id %d\n", id
);
711 if (id
== defaultPortId
) {
712 defaultRange
.clear();
713 // Only try to update these ranges if the user set a default responder.
714 if (useDefaultRange
) {
715 AddrRangeList ranges
=
716 masterPorts
[id
]->getSlavePort().getAddrRanges();
717 for(iter
= ranges
.begin(); iter
!= ranges
.end(); iter
++) {
718 defaultRange
.push_back(*iter
);
719 DPRINTF(BusAddrRanges
, "Adding range %#llx - %#llx for default range\n",
720 iter
->start
, iter
->end
);
725 assert(id
< masterPorts
.size() && id
>= 0);
726 BusMasterPort
*port
= masterPorts
[id
];
728 // Clean out any previously existent ids
729 for (PortIter portIter
= portMap
.begin();
730 portIter
!= portMap
.end(); ) {
731 if (portIter
->second
== id
)
732 portMap
.erase(portIter
++);
737 ranges
= port
->getSlavePort().getAddrRanges();
739 for (iter
= ranges
.begin(); iter
!= ranges
.end(); iter
++) {
740 DPRINTF(BusAddrRanges
, "Adding range %#llx - %#llx for id %d\n",
741 iter
->start
, iter
->end
, id
);
742 if (portMap
.insert(*iter
, id
) == portMap
.end()) {
743 int conflict_id
= portMap
.find(*iter
)->second
;
744 fatal("%s has two ports with same range:\n\t%s\n\t%s\n",
745 name(), masterPorts
[id
]->getSlavePort().name(),
746 masterPorts
[conflict_id
]->getSlavePort().name());
750 DPRINTF(BusAddrRanges
, "port list has %d entries\n", portMap
.size());
752 // tell all our peers that our address range has changed.
753 // Don't tell the device that caused this change, it already knows
754 std::vector
<BusSlavePort
*>::const_iterator intIter
;
756 for (intIter
= slavePorts
.begin(); intIter
!= slavePorts
.end(); intIter
++)
757 (*intIter
)->sendRangeChange();
759 inRecvRangeChange
.erase(id
);
763 Bus::getAddrRanges(Port::PortId id
)
765 AddrRangeList ranges
;
767 DPRINTF(BusAddrRanges
, "received address range request, returning:\n");
769 for (AddrRangeIter dflt_iter
= defaultRange
.begin();
770 dflt_iter
!= defaultRange
.end(); dflt_iter
++) {
771 ranges
.push_back(*dflt_iter
);
772 DPRINTF(BusAddrRanges
, " -- Dflt: %#llx : %#llx\n",dflt_iter
->start
,
775 for (PortIter portIter
= portMap
.begin();
776 portIter
!= portMap
.end(); portIter
++) {
778 for (AddrRangeIter dflt_iter
= defaultRange
.begin();
779 dflt_iter
!= defaultRange
.end(); dflt_iter
++) {
780 if ((portIter
->first
.start
< dflt_iter
->start
&&
781 portIter
->first
.end
>= dflt_iter
->start
) ||
782 (portIter
->first
.start
< dflt_iter
->end
&&
783 portIter
->first
.end
>= dflt_iter
->end
))
784 fatal("Devices can not set ranges that itersect the default set\
785 but are not a subset of the default set.\n");
786 if (portIter
->first
.start
>= dflt_iter
->start
&&
787 portIter
->first
.end
<= dflt_iter
->end
) {
789 DPRINTF(BusAddrRanges
, " -- %#llx : %#llx is a SUBSET\n",
790 portIter
->first
.start
, portIter
->first
.end
);
793 if (portIter
->second
!= id
&& !subset
) {
794 ranges
.push_back(portIter
->first
);
795 DPRINTF(BusAddrRanges
, " -- %#llx : %#llx\n",
796 portIter
->first
.start
, portIter
->first
.end
);
804 Bus::isSnooping(Port::PortId id
) const
806 // in essence, answer the question if there are snooping ports
807 return !snoopPorts
.empty();
811 Bus::findBlockSize(Port::PortId id
)
813 if (cachedBlockSizeValid
)
814 return cachedBlockSize
;
818 PortIter p_end
= portMap
.end();
819 for (PortIter p_iter
= portMap
.begin(); p_iter
!= p_end
; p_iter
++) {
820 unsigned tmp_bs
= masterPorts
[p_iter
->second
]->peerBlockSize();
824 SnoopIter s_end
= snoopPorts
.end();
825 for (SnoopIter s_iter
= snoopPorts
.begin(); s_iter
!= s_end
; s_iter
++) {
826 unsigned tmp_bs
= (*s_iter
)->peerBlockSize();
831 max_bs
= defaultBlockSize
;
834 warn_once("Blocksize found to not be 64... hmm... probably not.\n");
835 cachedBlockSize
= max_bs
;
836 cachedBlockSizeValid
= true;
842 Bus::drain(Event
* de
)
844 //We should check that we're not "doing" anything, and that noone is
845 //waiting. We might be idle but have someone waiting if the device we
846 //contacted for a retry didn't actually retry.
847 if (!retryList
.empty() || (curTick() < tickNextIdle
&&
848 busIdleEvent
.scheduled())) {
858 if (tickNextIdle
< curTick())
859 tickNextIdle
= (curTick() / clock
) * clock
+ clock
;
865 return new Bus(this);