coherent_xbar.cc (11334:9bd2e84abdca) coherent_xbar.cc (11544:2383451ff6a5)
1/*
2 * Copyright (c) 2011-2015 ARM Limited
3 * All rights reserved
4 *
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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110 delete l;
111 for (auto p: snoopRespPorts)
112 delete p;
113}
114
115void
116CoherentXBar::init()
117{
1/*
2 * Copyright (c) 2011-2015 ARM Limited
3 * All rights reserved
4 *
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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110 delete l;
111 for (auto p: snoopRespPorts)
112 delete p;
113}
114
115void
116CoherentXBar::init()
117{
118 // the base class is responsible for determining the block size
119 BaseXBar::init();
120
121 // iterate over our slave ports and determine which of our
122 // neighbouring master ports are snooping and add them as snoopers
123 for (const auto& p: slavePorts) {
124 // check if the connected master port is snooping
125 if (p->isSnooping()) {
126 DPRINTF(AddrRanges, "Adding snooping master %s\n",

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228 // snooping above
229 const bool expect_snoop_resp = !cache_responding && pkt->cacheResponding();
230 bool expect_response = pkt->needsResponse() && !pkt->cacheResponding();
231
232 const bool sink_packet = sinkPacket(pkt);
233
234 // in certain cases the crossbar is responsible for responding
235 bool respond_directly = false;
118 BaseXBar::init();
119
120 // iterate over our slave ports and determine which of our
121 // neighbouring master ports are snooping and add them as snoopers
122 for (const auto& p: slavePorts) {
123 // check if the connected master port is snooping
124 if (p->isSnooping()) {
125 DPRINTF(AddrRanges, "Adding snooping master %s\n",

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227 // snooping above
228 const bool expect_snoop_resp = !cache_responding && pkt->cacheResponding();
229 bool expect_response = pkt->needsResponse() && !pkt->cacheResponding();
230
231 const bool sink_packet = sinkPacket(pkt);
232
233 // in certain cases the crossbar is responsible for responding
234 bool respond_directly = false;
236
235 // store the original address as an address mapper could possibly
236 // modify the address upon a sendTimingRequest
237 const Addr addr(pkt->getAddr());
237 if (sink_packet) {
238 DPRINTF(CoherentXBar, "Not forwarding %s to %#llx\n",
239 pkt->cmdString(), pkt->getAddr());
240 } else {
241 // determine if we are forwarding the packet, or responding to
242 // it
243 if (!pointOfCoherency || pkt->isRead() || pkt->isWrite()) {
244 // if we are passing on, rather than sinking, a packet to

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260 respond_directly = true;
261 assert(!expect_snoop_resp);
262 expect_response = false;
263 }
264 }
265
266 if (snoopFilter && !system->bypassCaches()) {
267 // Let the snoop filter know about the success of the send operation
238 if (sink_packet) {
239 DPRINTF(CoherentXBar, "Not forwarding %s to %#llx\n",
240 pkt->cmdString(), pkt->getAddr());
241 } else {
242 // determine if we are forwarding the packet, or responding to
243 // it
244 if (!pointOfCoherency || pkt->isRead() || pkt->isWrite()) {
245 // if we are passing on, rather than sinking, a packet to

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261 respond_directly = true;
262 assert(!expect_snoop_resp);
263 expect_response = false;
264 }
265 }
266
267 if (snoopFilter && !system->bypassCaches()) {
268 // Let the snoop filter know about the success of the send operation
268 snoopFilter->finishRequest(!success, pkt);
269 snoopFilter->finishRequest(!success, addr);
269 }
270
271 // check if we were successful in sending the packet onwards
272 if (!success) {
273 // express snoops should never be forced to retry
274 assert(!is_express_snoop);
275
276 // restore the header delay

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655 " SF size: %i lat: %i\n", __func__,
656 slavePorts[slave_port_id]->name(), pkt->cmdString(),
657 pkt->getAddr(), sf_res.first.size(), sf_res.second);
658
659 // let the snoop filter know about the success of the send
660 // operation, and do it even before sending it onwards to
661 // avoid situations where atomic upward snoops sneak in
662 // between and change the filter state
270 }
271
272 // check if we were successful in sending the packet onwards
273 if (!success) {
274 // express snoops should never be forced to retry
275 assert(!is_express_snoop);
276
277 // restore the header delay

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656 " SF size: %i lat: %i\n", __func__,
657 slavePorts[slave_port_id]->name(), pkt->cmdString(),
658 pkt->getAddr(), sf_res.first.size(), sf_res.second);
659
660 // let the snoop filter know about the success of the send
661 // operation, and do it even before sending it onwards to
662 // avoid situations where atomic upward snoops sneak in
663 // between and change the filter state
663 snoopFilter->finishRequest(false, pkt);
664 snoopFilter->finishRequest(false, pkt->getAddr());
664
665 snoop_result = forwardAtomic(pkt, slave_port_id, InvalidPortID,
666 sf_res.first);
667 } else {
668 snoop_result = forwardAtomic(pkt, slave_port_id);
669 }
670 snoop_response_cmd = snoop_result.first;
671 snoop_response_latency += snoop_result.second;

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666 snoop_result = forwardAtomic(pkt, slave_port_id, InvalidPortID,
667 sf_res.first);
668 } else {
669 snoop_result = forwardAtomic(pkt, slave_port_id);
670 }
671 snoop_response_cmd = snoop_result.first;
672 snoop_response_latency += snoop_result.second;

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