1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/*
* 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
*/
#include "mem/tport.hh"
void
SimpleTimingPort::recvFunctional(PacketPtr pkt)
{
//First check queued events
std::list<PacketPtr>::iterator i = transmitList.begin();
std::list<PacketPtr>::iterator end = transmitList.end();
bool cont = true;
while (i != end && cont) {
PacketPtr target = *i;
// If the target contains data, and it overlaps the
// probed request, need to update data
if (target->intersect(pkt))
fixPacket(pkt, target);
}
//Then just do an atomic access and throw away the returned latency
if (cont)
recvAtomic(pkt);
}
bool
SimpleTimingPort::recvTiming(PacketPtr pkt)
{
// If the device is only a slave, it should only be sending
// responses, which should never get nacked. There used to be
// code to hanldle nacks here, but I'm pretty sure it didn't work
// correctly with the drain code, so that would need to be fixed
// if we ever added it back.
assert(pkt->result != Packet::Nacked);
Tick latency = recvAtomic(pkt);
// turn packet around to go back to requester if response expected
if (pkt->needsResponse()) {
pkt->makeTimingResponse();
sendTimingLater(pkt, latency);
}
else {
if (pkt->cmd != Packet::UpgradeReq)
{
delete pkt->req;
delete pkt;
}
}
return true;
}
void
SimpleTimingPort::recvRetry()
{
assert(outTiming > 0);
assert(!transmitList.empty());
if (sendTiming(transmitList.front())) {
transmitList.pop_front();
outTiming--;
DPRINTF(Bus, "No Longer waiting on retry\n");
if (!transmitList.empty())
sendTimingLater(transmitList.front(), 1);
}
if (transmitList.empty() && drainEvent) {
drainEvent->process();
drainEvent = NULL;
}
}
void
SimpleTimingPort::SendEvent::process()
{
assert(port->outTiming > 0);
if (!port->transmitList.empty() && port->transmitList.front() != packet) {
//We are not the head of the list
port->transmitList.push_back(packet);
} else if (port->sendTiming(packet)) {
// send successful
if (port->transmitList.size()) {
port->transmitList.pop_front();
port->outTiming--;
if (!port->transmitList.empty())
port->sendTimingLater(port->transmitList.front(), 1);
}
if (port->transmitList.empty() && port->drainEvent) {
port->drainEvent->process();
port->drainEvent = NULL;
}
} else {
// send unsuccessful (due to flow control). Will get retry
// callback later; save for then if not already
DPRINTF(Bus, "Waiting on retry\n");
if (!(port->transmitList.front() == packet))
port->transmitList.push_back(packet);
}
}
unsigned int
SimpleTimingPort::drain(Event *de)
{
if (outTiming == 0 && transmitList.size() == 0)
return 0;
drainEvent = de;
return 1;
}
|
