d35dd71ab4
This patch introduces latencies in crossbar that were neglected before. In particular, it adds three parameters in crossbar model: front_end_latency, forward_latency, and response_latency. Along with these parameters, three corresponding members are added: frontEndLatency, forwardLatency, and responseLatency. The coherent crossbar has an additional snoop_response_latency. The latency of the request path through the xbar is set as --> frontEndLatency + forwardLatency In case the snoop filter is enabled, the request path latency is charged also by look-up latency of the snoop filter. --> frontEndLatency + SF(lookupLatency) + forwardLatency. The latency of the response path through the xbar is set instead as --> responseLatency. In case of snoop response, if the response is treated as a normal response the latency associated is again --> responseLatency; If instead it is forwarded as snoop response we add an additional variable + snoopResponseLatency and the latency associated is --> snoopResponseLatency; Furthermore, this patch lets the crossbar progress on the next clock edge after an unused retry, changing the time the crossbar considers itself busy after sending a retry that was not acted upon.
630 lines
22 KiB
C++
630 lines
22 KiB
C++
/*
|
|
* Copyright (c) 2011-2015 ARM Limited
|
|
* All rights reserved
|
|
*
|
|
* The license below extends only to copyright in the software and shall
|
|
* not be construed as granting a license to any other intellectual
|
|
* property including but not limited to intellectual property relating
|
|
* to a hardware implementation of the functionality of the software
|
|
* licensed hereunder. You may use the software subject to the license
|
|
* terms below provided that you ensure that this notice is replicated
|
|
* unmodified and in its entirety in all distributions of the software,
|
|
* modified or unmodified, in source code or in binary form.
|
|
*
|
|
* Copyright (c) 2006 The Regents of The University of Michigan
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are
|
|
* met: redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer;
|
|
* redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution;
|
|
* neither the name of the copyright holders nor the names of its
|
|
* contributors may be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* Authors: Ali Saidi
|
|
* Andreas Hansson
|
|
* William Wang
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* Definition of a crossbar object.
|
|
*/
|
|
|
|
#include "base/misc.hh"
|
|
#include "base/trace.hh"
|
|
#include "debug/AddrRanges.hh"
|
|
#include "debug/Drain.hh"
|
|
#include "debug/XBar.hh"
|
|
#include "mem/xbar.hh"
|
|
|
|
BaseXBar::BaseXBar(const BaseXBarParams *p)
|
|
: MemObject(p),
|
|
frontendLatency(p->frontend_latency),
|
|
forwardLatency(p->forward_latency),
|
|
responseLatency(p->response_latency),
|
|
width(p->width),
|
|
gotAddrRanges(p->port_default_connection_count +
|
|
p->port_master_connection_count, false),
|
|
gotAllAddrRanges(false), defaultPortID(InvalidPortID),
|
|
useDefaultRange(p->use_default_range)
|
|
{}
|
|
|
|
BaseXBar::~BaseXBar()
|
|
{
|
|
for (auto m: masterPorts)
|
|
delete m;
|
|
|
|
for (auto s: slavePorts)
|
|
delete s;
|
|
}
|
|
|
|
void
|
|
BaseXBar::init()
|
|
{
|
|
}
|
|
|
|
BaseMasterPort &
|
|
BaseXBar::getMasterPort(const std::string &if_name, PortID idx)
|
|
{
|
|
if (if_name == "master" && idx < masterPorts.size()) {
|
|
// the master port index translates directly to the vector position
|
|
return *masterPorts[idx];
|
|
} else if (if_name == "default") {
|
|
return *masterPorts[defaultPortID];
|
|
} else {
|
|
return MemObject::getMasterPort(if_name, idx);
|
|
}
|
|
}
|
|
|
|
BaseSlavePort &
|
|
BaseXBar::getSlavePort(const std::string &if_name, PortID idx)
|
|
{
|
|
if (if_name == "slave" && idx < slavePorts.size()) {
|
|
// the slave port index translates directly to the vector position
|
|
return *slavePorts[idx];
|
|
} else {
|
|
return MemObject::getSlavePort(if_name, idx);
|
|
}
|
|
}
|
|
|
|
void
|
|
BaseXBar::calcPacketTiming(PacketPtr pkt, Tick header_delay)
|
|
{
|
|
// the crossbar will be called at a time that is not necessarily
|
|
// coinciding with its own clock, so start by determining how long
|
|
// until the next clock edge (could be zero)
|
|
Tick offset = clockEdge() - curTick();
|
|
|
|
// the header delay depends on the path through the crossbar, and
|
|
// we therefore rely on the caller to provide the actual
|
|
// value
|
|
pkt->headerDelay += offset + header_delay;
|
|
|
|
// note that we add the header delay to the existing value, and
|
|
// align it to the crossbar clock
|
|
|
|
// do a quick sanity check to ensure the timings are not being
|
|
// ignored, note that this specific value may cause problems for
|
|
// slower interconnects
|
|
panic_if(pkt->headerDelay > SimClock::Int::us,
|
|
"Encountered header delay exceeding 1 us\n");
|
|
|
|
if (pkt->hasData()) {
|
|
// the payloadDelay takes into account the relative time to
|
|
// deliver the payload of the packet, after the header delay,
|
|
// we take the maximum since the payload delay could already
|
|
// be longer than what this parcitular crossbar enforces.
|
|
pkt->payloadDelay = std::max<Tick>(pkt->payloadDelay,
|
|
divCeil(pkt->getSize(), width) *
|
|
clockPeriod());
|
|
}
|
|
|
|
// the payload delay is not paying for the clock offset as that is
|
|
// already done using the header delay, and the payload delay is
|
|
// also used to determine how long the crossbar layer is busy and
|
|
// thus regulates throughput
|
|
}
|
|
|
|
template <typename SrcType, typename DstType>
|
|
BaseXBar::Layer<SrcType,DstType>::Layer(DstType& _port, BaseXBar& _xbar,
|
|
const std::string& _name) :
|
|
port(_port), xbar(_xbar), _name(_name), state(IDLE), drainManager(NULL),
|
|
waitingForPeer(NULL), releaseEvent(this)
|
|
{
|
|
}
|
|
|
|
template <typename SrcType, typename DstType>
|
|
void BaseXBar::Layer<SrcType,DstType>::occupyLayer(Tick until)
|
|
{
|
|
// ensure the state is busy at this point, as the layer should
|
|
// transition from idle as soon as it has decided to forward the
|
|
// packet to prevent any follow-on calls to sendTiming seeing an
|
|
// unoccupied layer
|
|
assert(state == BUSY);
|
|
|
|
// until should never be 0 as express snoops never occupy the layer
|
|
assert(until != 0);
|
|
xbar.schedule(releaseEvent, until);
|
|
|
|
// account for the occupied ticks
|
|
occupancy += until - curTick();
|
|
|
|
DPRINTF(BaseXBar, "The crossbar layer is now busy from tick %d to %d\n",
|
|
curTick(), until);
|
|
}
|
|
|
|
template <typename SrcType, typename DstType>
|
|
bool
|
|
BaseXBar::Layer<SrcType,DstType>::tryTiming(SrcType* src_port)
|
|
{
|
|
// if we are in the retry state, we will not see anything but the
|
|
// retrying port (or in the case of the snoop ports the snoop
|
|
// response port that mirrors the actual slave port) as we leave
|
|
// this state again in zero time if the peer does not immediately
|
|
// call the layer when receiving the retry
|
|
|
|
// first we see if the layer is busy, next we check if the
|
|
// destination port is already engaged in a transaction waiting
|
|
// for a retry from the peer
|
|
if (state == BUSY || waitingForPeer != NULL) {
|
|
// the port should not be waiting already
|
|
assert(std::find(waitingForLayer.begin(), waitingForLayer.end(),
|
|
src_port) == waitingForLayer.end());
|
|
|
|
// put the port at the end of the retry list waiting for the
|
|
// layer to be freed up (and in the case of a busy peer, for
|
|
// that transaction to go through, and then the layer to free
|
|
// up)
|
|
waitingForLayer.push_back(src_port);
|
|
return false;
|
|
}
|
|
|
|
state = BUSY;
|
|
|
|
return true;
|
|
}
|
|
|
|
template <typename SrcType, typename DstType>
|
|
void
|
|
BaseXBar::Layer<SrcType,DstType>::succeededTiming(Tick busy_time)
|
|
{
|
|
// we should have gone from idle or retry to busy in the tryTiming
|
|
// test
|
|
assert(state == BUSY);
|
|
|
|
// occupy the layer accordingly
|
|
occupyLayer(busy_time);
|
|
}
|
|
|
|
template <typename SrcType, typename DstType>
|
|
void
|
|
BaseXBar::Layer<SrcType,DstType>::failedTiming(SrcType* src_port,
|
|
Tick busy_time)
|
|
{
|
|
// ensure no one got in between and tried to send something to
|
|
// this port
|
|
assert(waitingForPeer == NULL);
|
|
|
|
// if the source port is the current retrying one or not, we have
|
|
// failed in forwarding and should track that we are now waiting
|
|
// for the peer to send a retry
|
|
waitingForPeer = src_port;
|
|
|
|
// we should have gone from idle or retry to busy in the tryTiming
|
|
// test
|
|
assert(state == BUSY);
|
|
|
|
// occupy the bus accordingly
|
|
occupyLayer(busy_time);
|
|
}
|
|
|
|
template <typename SrcType, typename DstType>
|
|
void
|
|
BaseXBar::Layer<SrcType,DstType>::releaseLayer()
|
|
{
|
|
// releasing the bus means we should now be idle
|
|
assert(state == BUSY);
|
|
assert(!releaseEvent.scheduled());
|
|
|
|
// update the state
|
|
state = IDLE;
|
|
|
|
// bus layer is now idle, so if someone is waiting we can retry
|
|
if (!waitingForLayer.empty()) {
|
|
// there is no point in sending a retry if someone is still
|
|
// waiting for the peer
|
|
if (waitingForPeer == NULL)
|
|
retryWaiting();
|
|
} else if (waitingForPeer == NULL && drainManager) {
|
|
DPRINTF(Drain, "Crossbar done draining, signaling drain manager\n");
|
|
//If we weren't able to drain before, do it now.
|
|
drainManager->signalDrainDone();
|
|
// Clear the drain event once we're done with it.
|
|
drainManager = NULL;
|
|
}
|
|
}
|
|
|
|
template <typename SrcType, typename DstType>
|
|
void
|
|
BaseXBar::Layer<SrcType,DstType>::retryWaiting()
|
|
{
|
|
// this should never be called with no one waiting
|
|
assert(!waitingForLayer.empty());
|
|
|
|
// we always go to retrying from idle
|
|
assert(state == IDLE);
|
|
|
|
// update the state
|
|
state = RETRY;
|
|
|
|
// set the retrying port to the front of the retry list and pop it
|
|
// off the list
|
|
SrcType* retryingPort = waitingForLayer.front();
|
|
waitingForLayer.pop_front();
|
|
|
|
// tell the port to retry, which in some cases ends up calling the
|
|
// layer again
|
|
sendRetry(retryingPort);
|
|
|
|
// If the layer is still in the retry state, sendTiming wasn't
|
|
// called in zero time (e.g. the cache does this when a writeback
|
|
// is squashed)
|
|
if (state == RETRY) {
|
|
// update the state to busy and reset the retrying port, we
|
|
// have done our bit and sent the retry
|
|
state = BUSY;
|
|
|
|
// occupy the crossbar layer until the next clock edge
|
|
occupyLayer(xbar.clockEdge());
|
|
}
|
|
}
|
|
|
|
template <typename SrcType, typename DstType>
|
|
void
|
|
BaseXBar::Layer<SrcType,DstType>::recvRetry()
|
|
{
|
|
// we should never get a retry without having failed to forward
|
|
// something to this port
|
|
assert(waitingForPeer != NULL);
|
|
|
|
// add the port where the failed packet originated to the front of
|
|
// the waiting ports for the layer, this allows us to call retry
|
|
// on the port immediately if the crossbar layer is idle
|
|
waitingForLayer.push_front(waitingForPeer);
|
|
|
|
// we are no longer waiting for the peer
|
|
waitingForPeer = NULL;
|
|
|
|
// if the layer is idle, retry this port straight away, if we
|
|
// are busy, then simply let the port wait for its turn
|
|
if (state == IDLE) {
|
|
retryWaiting();
|
|
} else {
|
|
assert(state == BUSY);
|
|
}
|
|
}
|
|
|
|
PortID
|
|
BaseXBar::findPort(Addr addr)
|
|
{
|
|
// we should never see any address lookups before we've got the
|
|
// ranges of all connected slave modules
|
|
assert(gotAllAddrRanges);
|
|
|
|
// Check the cache
|
|
PortID dest_id = checkPortCache(addr);
|
|
if (dest_id != InvalidPortID)
|
|
return dest_id;
|
|
|
|
// Check the address map interval tree
|
|
auto i = portMap.find(addr);
|
|
if (i != portMap.end()) {
|
|
dest_id = i->second;
|
|
updatePortCache(dest_id, i->first);
|
|
return dest_id;
|
|
}
|
|
|
|
// Check if this matches the default range
|
|
if (useDefaultRange) {
|
|
if (defaultRange.contains(addr)) {
|
|
DPRINTF(AddrRanges, " found addr %#llx on default\n",
|
|
addr);
|
|
return defaultPortID;
|
|
}
|
|
} else if (defaultPortID != InvalidPortID) {
|
|
DPRINTF(AddrRanges, "Unable to find destination for addr %#llx, "
|
|
"will use default port\n", addr);
|
|
return defaultPortID;
|
|
}
|
|
|
|
// we should use the range for the default port and it did not
|
|
// match, or the default port is not set
|
|
fatal("Unable to find destination for addr %#llx on %s\n", addr,
|
|
name());
|
|
}
|
|
|
|
/** Function called by the port when the crossbar is receiving a range change.*/
|
|
void
|
|
BaseXBar::recvRangeChange(PortID master_port_id)
|
|
{
|
|
DPRINTF(AddrRanges, "Received range change from slave port %s\n",
|
|
masterPorts[master_port_id]->getSlavePort().name());
|
|
|
|
// remember that we got a range from this master port and thus the
|
|
// connected slave module
|
|
gotAddrRanges[master_port_id] = true;
|
|
|
|
// update the global flag
|
|
if (!gotAllAddrRanges) {
|
|
// take a logical AND of all the ports and see if we got
|
|
// ranges from everyone
|
|
gotAllAddrRanges = true;
|
|
std::vector<bool>::const_iterator r = gotAddrRanges.begin();
|
|
while (gotAllAddrRanges && r != gotAddrRanges.end()) {
|
|
gotAllAddrRanges &= *r++;
|
|
}
|
|
if (gotAllAddrRanges)
|
|
DPRINTF(AddrRanges, "Got address ranges from all slaves\n");
|
|
}
|
|
|
|
// note that we could get the range from the default port at any
|
|
// point in time, and we cannot assume that the default range is
|
|
// set before the other ones are, so we do additional checks once
|
|
// all ranges are provided
|
|
if (master_port_id == defaultPortID) {
|
|
// only update if we are indeed checking ranges for the
|
|
// default port since the port might not have a valid range
|
|
// otherwise
|
|
if (useDefaultRange) {
|
|
AddrRangeList ranges = masterPorts[master_port_id]->getAddrRanges();
|
|
|
|
if (ranges.size() != 1)
|
|
fatal("Crossbar %s may only have a single default range",
|
|
name());
|
|
|
|
defaultRange = ranges.front();
|
|
}
|
|
} else {
|
|
// the ports are allowed to update their address ranges
|
|
// dynamically, so remove any existing entries
|
|
if (gotAddrRanges[master_port_id]) {
|
|
for (auto p = portMap.begin(); p != portMap.end(); ) {
|
|
if (p->second == master_port_id)
|
|
// erasing invalidates the iterator, so advance it
|
|
// before the deletion takes place
|
|
portMap.erase(p++);
|
|
else
|
|
p++;
|
|
}
|
|
}
|
|
|
|
AddrRangeList ranges = masterPorts[master_port_id]->getAddrRanges();
|
|
|
|
for (const auto& r: ranges) {
|
|
DPRINTF(AddrRanges, "Adding range %s for id %d\n",
|
|
r.to_string(), master_port_id);
|
|
if (portMap.insert(r, master_port_id) == portMap.end()) {
|
|
PortID conflict_id = portMap.find(r)->second;
|
|
fatal("%s has two ports responding within range %s:\n\t%s\n\t%s\n",
|
|
name(),
|
|
r.to_string(),
|
|
masterPorts[master_port_id]->getSlavePort().name(),
|
|
masterPorts[conflict_id]->getSlavePort().name());
|
|
}
|
|
}
|
|
}
|
|
|
|
// if we have received ranges from all our neighbouring slave
|
|
// modules, go ahead and tell our connected master modules in
|
|
// turn, this effectively assumes a tree structure of the system
|
|
if (gotAllAddrRanges) {
|
|
DPRINTF(AddrRanges, "Aggregating address ranges\n");
|
|
xbarRanges.clear();
|
|
|
|
// start out with the default range
|
|
if (useDefaultRange) {
|
|
if (!gotAddrRanges[defaultPortID])
|
|
fatal("Crossbar %s uses default range, but none provided",
|
|
name());
|
|
|
|
xbarRanges.push_back(defaultRange);
|
|
DPRINTF(AddrRanges, "-- Adding default %s\n",
|
|
defaultRange.to_string());
|
|
}
|
|
|
|
// merge all interleaved ranges and add any range that is not
|
|
// a subset of the default range
|
|
std::vector<AddrRange> intlv_ranges;
|
|
for (const auto& r: portMap) {
|
|
// if the range is interleaved then save it for now
|
|
if (r.first.interleaved()) {
|
|
// if we already got interleaved ranges that are not
|
|
// part of the same range, then first do a merge
|
|
// before we add the new one
|
|
if (!intlv_ranges.empty() &&
|
|
!intlv_ranges.back().mergesWith(r.first)) {
|
|
DPRINTF(AddrRanges, "-- Merging range from %d ranges\n",
|
|
intlv_ranges.size());
|
|
AddrRange merged_range(intlv_ranges);
|
|
// next decide if we keep the merged range or not
|
|
if (!(useDefaultRange &&
|
|
merged_range.isSubset(defaultRange))) {
|
|
xbarRanges.push_back(merged_range);
|
|
DPRINTF(AddrRanges, "-- Adding merged range %s\n",
|
|
merged_range.to_string());
|
|
}
|
|
intlv_ranges.clear();
|
|
}
|
|
intlv_ranges.push_back(r.first);
|
|
} else {
|
|
// keep the current range if not a subset of the default
|
|
if (!(useDefaultRange &&
|
|
r.first.isSubset(defaultRange))) {
|
|
xbarRanges.push_back(r.first);
|
|
DPRINTF(AddrRanges, "-- Adding range %s\n",
|
|
r.first.to_string());
|
|
}
|
|
}
|
|
}
|
|
|
|
// if there is still interleaved ranges waiting to be merged,
|
|
// go ahead and do it
|
|
if (!intlv_ranges.empty()) {
|
|
DPRINTF(AddrRanges, "-- Merging range from %d ranges\n",
|
|
intlv_ranges.size());
|
|
AddrRange merged_range(intlv_ranges);
|
|
if (!(useDefaultRange && merged_range.isSubset(defaultRange))) {
|
|
xbarRanges.push_back(merged_range);
|
|
DPRINTF(AddrRanges, "-- Adding merged range %s\n",
|
|
merged_range.to_string());
|
|
}
|
|
}
|
|
|
|
// also check that no range partially overlaps with the
|
|
// default range, this has to be done after all ranges are set
|
|
// as there are no guarantees for when the default range is
|
|
// update with respect to the other ones
|
|
if (useDefaultRange) {
|
|
for (const auto& r: xbarRanges) {
|
|
// see if the new range is partially
|
|
// overlapping the default range
|
|
if (r.intersects(defaultRange) &&
|
|
!r.isSubset(defaultRange))
|
|
fatal("Range %s intersects the " \
|
|
"default range of %s but is not a " \
|
|
"subset\n", r.to_string(), name());
|
|
}
|
|
}
|
|
|
|
// tell all our neighbouring master ports that our address
|
|
// ranges have changed
|
|
for (const auto& s: slavePorts)
|
|
s->sendRangeChange();
|
|
}
|
|
|
|
clearPortCache();
|
|
}
|
|
|
|
AddrRangeList
|
|
BaseXBar::getAddrRanges() const
|
|
{
|
|
// we should never be asked without first having sent a range
|
|
// change, and the latter is only done once we have all the ranges
|
|
// of the connected devices
|
|
assert(gotAllAddrRanges);
|
|
|
|
// at the moment, this never happens, as there are no cycles in
|
|
// the range queries and no devices on the master side of a crossbar
|
|
// (CPU, cache, bridge etc) actually care about the ranges of the
|
|
// ports they are connected to
|
|
|
|
DPRINTF(AddrRanges, "Received address range request\n");
|
|
|
|
return xbarRanges;
|
|
}
|
|
|
|
void
|
|
BaseXBar::regStats()
|
|
{
|
|
using namespace Stats;
|
|
|
|
transDist
|
|
.init(MemCmd::NUM_MEM_CMDS)
|
|
.name(name() + ".trans_dist")
|
|
.desc("Transaction distribution")
|
|
.flags(nozero);
|
|
|
|
// get the string representation of the commands
|
|
for (int i = 0; i < MemCmd::NUM_MEM_CMDS; i++) {
|
|
MemCmd cmd(i);
|
|
const std::string &cstr = cmd.toString();
|
|
transDist.subname(i, cstr);
|
|
}
|
|
|
|
pktCount
|
|
.init(slavePorts.size(), masterPorts.size())
|
|
.name(name() + ".pkt_count")
|
|
.desc("Packet count per connected master and slave (bytes)")
|
|
.flags(total | nozero | nonan);
|
|
|
|
pktSize
|
|
.init(slavePorts.size(), masterPorts.size())
|
|
.name(name() + ".pkt_size")
|
|
.desc("Cumulative packet size per connected master and slave (bytes)")
|
|
.flags(total | nozero | nonan);
|
|
|
|
// both the packet count and total size are two-dimensional
|
|
// vectors, indexed by slave port id and master port id, thus the
|
|
// neighbouring master and slave, they do not differentiate what
|
|
// came from the master and was forwarded to the slave (requests
|
|
// and snoop responses) and what came from the slave and was
|
|
// forwarded to the master (responses and snoop requests)
|
|
for (int i = 0; i < slavePorts.size(); i++) {
|
|
pktCount.subname(i, slavePorts[i]->getMasterPort().name());
|
|
pktSize.subname(i, slavePorts[i]->getMasterPort().name());
|
|
for (int j = 0; j < masterPorts.size(); j++) {
|
|
pktCount.ysubname(j, masterPorts[j]->getSlavePort().name());
|
|
pktSize.ysubname(j, masterPorts[j]->getSlavePort().name());
|
|
}
|
|
}
|
|
}
|
|
|
|
template <typename SrcType, typename DstType>
|
|
unsigned int
|
|
BaseXBar::Layer<SrcType,DstType>::drain(DrainManager *dm)
|
|
{
|
|
//We should check that we're not "doing" anything, and that noone is
|
|
//waiting. We might be idle but have someone waiting if the device we
|
|
//contacted for a retry didn't actually retry.
|
|
if (state != IDLE) {
|
|
DPRINTF(Drain, "Crossbar not drained\n");
|
|
drainManager = dm;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
template <typename SrcType, typename DstType>
|
|
void
|
|
BaseXBar::Layer<SrcType,DstType>::regStats()
|
|
{
|
|
using namespace Stats;
|
|
|
|
occupancy
|
|
.name(name() + ".occupancy")
|
|
.desc("Layer occupancy (ticks)")
|
|
.flags(nozero);
|
|
|
|
utilization
|
|
.name(name() + ".utilization")
|
|
.desc("Layer utilization (%)")
|
|
.precision(1)
|
|
.flags(nozero);
|
|
|
|
utilization = 100 * occupancy / simTicks;
|
|
}
|
|
|
|
/**
|
|
* Crossbar layer template instantiations. Could be removed with _impl.hh
|
|
* file, but since there are only two given options (MasterPort and
|
|
* SlavePort) it seems a bit excessive at this point.
|
|
*/
|
|
template class BaseXBar::Layer<SlavePort,MasterPort>;
|
|
template class BaseXBar::Layer<MasterPort,SlavePort>;
|