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
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2002-2005 The Regents of The University of Michigan
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Ron Dreslinski
41 * Ali Saidi
42 * Andreas Hansson
43 * William Wang
44 */
45
46/**
47 * @file
48 * Declaration of a non-coherent crossbar.
49 */
50
51#ifndef __MEM_NONCOHERENT_XBAR_HH__
52#define __MEM_NONCOHERENT_XBAR_HH__
53
54#include "mem/xbar.hh"
55#include "params/NoncoherentXBar.hh"
56
57/**
58 * A non-coherent crossbar connects a number of non-snooping masters
59 * and slaves, and routes the request and response packets based on
60 * the address. The request packets issued by the master connected to
61 * a non-coherent crossbar could still snoop in caches attached to a
62 * coherent crossbar, as is the case with the I/O bus and memory bus
63 * in most system configurations. No snoops will, however, reach any
64 * master on the non-coherent crossbar itself.
65 *
66 * The non-coherent crossbar can be used as a template for modelling
67 * PCIe, and non-coherent AMBA and OCP buses, and is typically used
68 * for the I/O buses.
69 */
70class NoncoherentXBar : public BaseXBar
71{
72
73 protected:
74
75 /**
76 * Declare the layers of this crossbar, one vector for requests
77 * and one for responses.
78 */
79 std::vector<ReqLayer*> reqLayers;
80 std::vector<RespLayer*> respLayers;
81
82 /**
83 * Declaration of the non-coherent crossbar slave port type, one
84 * will be instantiated for each of the master ports connecting to
85 * the crossbar.
86 */
87 class NoncoherentXBarSlavePort : public SlavePort
88 {
89 private:
90
91 /** A reference to the crossbar to which this port belongs. */
92 NoncoherentXBar &xbar;
93
94 public:
95
96 NoncoherentXBarSlavePort(const std::string &_name,
97 NoncoherentXBar &_xbar, PortID _id)
98 : SlavePort(_name, &_xbar, _id), xbar(_xbar)
99 { }
100
101 protected:
102
103 /**
104 * When receiving a timing request, pass it to the crossbar.
105 */
106 virtual bool recvTimingReq(PacketPtr pkt)
107 { return xbar.recvTimingReq(pkt, id); }
108
109 /**
110 * When receiving an atomic request, pass it to the crossbar.
111 */
112 virtual Tick recvAtomic(PacketPtr pkt)
113 { return xbar.recvAtomic(pkt, id); }
114
115 /**
116 * When receiving a functional request, pass it to the crossbar.
117 */
118 virtual void recvFunctional(PacketPtr pkt)
119 { xbar.recvFunctional(pkt, id); }
120
121 /**
122 * When receiving a retry, pass it to the crossbar.
123 */
124 virtual void recvRespRetry()
125 { panic("Crossbar slave ports should never retry.\n"); }
126
127 /**
128 * Return the union of all adress ranges seen by this crossbar.
129 */
130 virtual AddrRangeList getAddrRanges() const
131 { return xbar.getAddrRanges(); }
132
133 };
134
135 /**
136 * Declaration of the crossbar master port type, one will be
137 * instantiated for each of the slave ports connecting to the
138 * crossbar.
139 */
140 class NoncoherentXBarMasterPort : public MasterPort
141 {
142 private:
143
144 /** A reference to the crossbar to which this port belongs. */
145 NoncoherentXBar &xbar;
146
147 public:
148
149 NoncoherentXBarMasterPort(const std::string &_name,
150 NoncoherentXBar &_xbar, PortID _id)
151 : MasterPort(_name, &_xbar, _id), xbar(_xbar)
152 { }
153
154 protected:
155
156 /**
157 * When receiving a timing response, pass it to the crossbar.
158 */
159 virtual bool recvTimingResp(PacketPtr pkt)
160 { return xbar.recvTimingResp(pkt, id); }
161
162 /** When reciving a range change from the peer port (at id),
163 pass it to the crossbar. */
164 virtual void recvRangeChange()
165 { xbar.recvRangeChange(id); }
166
167 /** When reciving a retry from the peer port (at id),
168 pass it to the crossbar. */
169 virtual void recvReqRetry()
170 { xbar.recvReqRetry(id); }
171
172 };
173
174 /** Function called by the port when the crossbar is recieving a Timing
175 request packet.*/
176 virtual bool recvTimingReq(PacketPtr pkt, PortID slave_port_id);
177
178 /** Function called by the port when the crossbar is recieving a Timing
179 response packet.*/
180 virtual bool recvTimingResp(PacketPtr pkt, PortID master_port_id);
181
182 /** Timing function called by port when it is once again able to process
183 * requests. */
184 void recvReqRetry(PortID master_port_id);
185
186 /** Function called by the port when the crossbar is recieving a Atomic
187 transaction.*/
188 Tick recvAtomic(PacketPtr pkt, PortID slave_port_id);
189
190 /** Function called by the port when the crossbar is recieving a Functional
191 transaction.*/
192 void recvFunctional(PacketPtr pkt, PortID slave_port_id);
193
194 public:
195
196 NoncoherentXBar(const NoncoherentXBarParams *p);
197
198 virtual ~NoncoherentXBar();
199
200 unsigned int drain(DrainManager *dm);
201
202 /**
203 * stats
204 */
205 virtual void regStats();
206 Stats::Scalar totPktSize;
207};
208
209#endif //__MEM_NONCOHERENT_XBAR_HH__
| 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
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2002-2005 The Regents of The University of Michigan
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Ron Dreslinski
41 * Ali Saidi
42 * Andreas Hansson
43 * William Wang
44 */
45
46/**
47 * @file
48 * Declaration of a non-coherent crossbar.
49 */
50
51#ifndef __MEM_NONCOHERENT_XBAR_HH__
52#define __MEM_NONCOHERENT_XBAR_HH__
53
54#include "mem/xbar.hh"
55#include "params/NoncoherentXBar.hh"
56
57/**
58 * A non-coherent crossbar connects a number of non-snooping masters
59 * and slaves, and routes the request and response packets based on
60 * the address. The request packets issued by the master connected to
61 * a non-coherent crossbar could still snoop in caches attached to a
62 * coherent crossbar, as is the case with the I/O bus and memory bus
63 * in most system configurations. No snoops will, however, reach any
64 * master on the non-coherent crossbar itself.
65 *
66 * The non-coherent crossbar can be used as a template for modelling
67 * PCIe, and non-coherent AMBA and OCP buses, and is typically used
68 * for the I/O buses.
69 */
70class NoncoherentXBar : public BaseXBar
71{
72
73 protected:
74
75 /**
76 * Declare the layers of this crossbar, one vector for requests
77 * and one for responses.
78 */
79 std::vector<ReqLayer*> reqLayers;
80 std::vector<RespLayer*> respLayers;
81
82 /**
83 * Declaration of the non-coherent crossbar slave port type, one
84 * will be instantiated for each of the master ports connecting to
85 * the crossbar.
86 */
87 class NoncoherentXBarSlavePort : public SlavePort
88 {
89 private:
90
91 /** A reference to the crossbar to which this port belongs. */
92 NoncoherentXBar &xbar;
93
94 public:
95
96 NoncoherentXBarSlavePort(const std::string &_name,
97 NoncoherentXBar &_xbar, PortID _id)
98 : SlavePort(_name, &_xbar, _id), xbar(_xbar)
99 { }
100
101 protected:
102
103 /**
104 * When receiving a timing request, pass it to the crossbar.
105 */
106 virtual bool recvTimingReq(PacketPtr pkt)
107 { return xbar.recvTimingReq(pkt, id); }
108
109 /**
110 * When receiving an atomic request, pass it to the crossbar.
111 */
112 virtual Tick recvAtomic(PacketPtr pkt)
113 { return xbar.recvAtomic(pkt, id); }
114
115 /**
116 * When receiving a functional request, pass it to the crossbar.
117 */
118 virtual void recvFunctional(PacketPtr pkt)
119 { xbar.recvFunctional(pkt, id); }
120
121 /**
122 * When receiving a retry, pass it to the crossbar.
123 */
124 virtual void recvRespRetry()
125 { panic("Crossbar slave ports should never retry.\n"); }
126
127 /**
128 * Return the union of all adress ranges seen by this crossbar.
129 */
130 virtual AddrRangeList getAddrRanges() const
131 { return xbar.getAddrRanges(); }
132
133 };
134
135 /**
136 * Declaration of the crossbar master port type, one will be
137 * instantiated for each of the slave ports connecting to the
138 * crossbar.
139 */
140 class NoncoherentXBarMasterPort : public MasterPort
141 {
142 private:
143
144 /** A reference to the crossbar to which this port belongs. */
145 NoncoherentXBar &xbar;
146
147 public:
148
149 NoncoherentXBarMasterPort(const std::string &_name,
150 NoncoherentXBar &_xbar, PortID _id)
151 : MasterPort(_name, &_xbar, _id), xbar(_xbar)
152 { }
153
154 protected:
155
156 /**
157 * When receiving a timing response, pass it to the crossbar.
158 */
159 virtual bool recvTimingResp(PacketPtr pkt)
160 { return xbar.recvTimingResp(pkt, id); }
161
162 /** When reciving a range change from the peer port (at id),
163 pass it to the crossbar. */
164 virtual void recvRangeChange()
165 { xbar.recvRangeChange(id); }
166
167 /** When reciving a retry from the peer port (at id),
168 pass it to the crossbar. */
169 virtual void recvReqRetry()
170 { xbar.recvReqRetry(id); }
171
172 };
173
174 /** Function called by the port when the crossbar is recieving a Timing
175 request packet.*/
176 virtual bool recvTimingReq(PacketPtr pkt, PortID slave_port_id);
177
178 /** Function called by the port when the crossbar is recieving a Timing
179 response packet.*/
180 virtual bool recvTimingResp(PacketPtr pkt, PortID master_port_id);
181
182 /** Timing function called by port when it is once again able to process
183 * requests. */
184 void recvReqRetry(PortID master_port_id);
185
186 /** Function called by the port when the crossbar is recieving a Atomic
187 transaction.*/
188 Tick recvAtomic(PacketPtr pkt, PortID slave_port_id);
189
190 /** Function called by the port when the crossbar is recieving a Functional
191 transaction.*/
192 void recvFunctional(PacketPtr pkt, PortID slave_port_id);
193
194 public:
195
196 NoncoherentXBar(const NoncoherentXBarParams *p);
197
198 virtual ~NoncoherentXBar();
199
200 unsigned int drain(DrainManager *dm);
201
202 /**
203 * stats
204 */
205 virtual void regStats();
206 Stats::Scalar totPktSize;
207};
208
209#endif //__MEM_NONCOHERENT_XBAR_HH__
|