1 | /* |
---|
2 | * SOCLIB_LGPL_HEADER_BEGIN |
---|
3 | * |
---|
4 | * This file is part of SoCLib, GNU LGPLv2.1. |
---|
5 | * |
---|
6 | * SoCLib is free software; you can redistribute it and/or modify it |
---|
7 | * under the terms of the GNU Lesser General Public License as published |
---|
8 | * by the Free Software Foundation; version 2.1 of the License. |
---|
9 | * |
---|
10 | * SoCLib is distributed in the hope that it will be useful, but |
---|
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
---|
13 | * Lesser General Public License for more details. |
---|
14 | * |
---|
15 | * You should have received a copy of the GNU Lesser General Public |
---|
16 | * License along with SoCLib; if not, write to the Free Software |
---|
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
---|
18 | * 02110-1301 USA |
---|
19 | * |
---|
20 | * SOCLIB_LGPL_HEADER_END |
---|
21 | * |
---|
22 | * Copyright (c) UPMC, Lip6, Asim |
---|
23 | Alain Greiner <alain.greiner@lip6.fr> 2005 |
---|
24 | * Nicolas Pouillon <nipo@ssji.net>, 2008 |
---|
25 | * |
---|
26 | * Maintainers: alain |
---|
27 | */ |
---|
28 | |
---|
29 | /////////////////////////////////////////////////////////////////////////// |
---|
30 | // Implementation Note : |
---|
31 | // This component is implemented as two independant combinational |
---|
32 | // crossbars, for VCI commands and VCI responses respectively. |
---|
33 | // - The CMD crossbar has NI local plus one global input |
---|
34 | // ports. It has NT local + one global output ports. |
---|
35 | // - The RSP crossbar has NT local plus one global input |
---|
36 | // ports. It has NI local + one global output ports. |
---|
37 | // For each generic crossbar, the input and output ports are impemented |
---|
38 | // as arrays of ports, and the last port (i.e. the largest index value) |
---|
39 | // is the port connected to the global interconnect. |
---|
40 | // |
---|
41 | // This component does not contain FIFOs, and behaves as a Mealy FSM. |
---|
42 | // |
---|
43 | // It supportsi single flit VCI broadcast commands : If the |
---|
44 | // two lsb bits of the VCI ADDRESS are non zero, the corresponding |
---|
45 | // command is considered as a broadcast. |
---|
46 | // For a broadcast, the single VCI flit is SEQUENCIALLY transmitted |
---|
47 | // to the (NT+1) output ports, but not to the requesting input port. |
---|
48 | // For each transmitted flit to a given output port, the standard |
---|
49 | // round-robin allocation policy is respected. |
---|
50 | // As the broadcast command arriving on input port (i) should not be |
---|
51 | // transmitted to the requester, it is not transmitted on output port (i). |
---|
52 | // Therefore, in case of broadcast, NI & NT must be equal, and all |
---|
53 | // connected components mus have the same index for input & output ports. |
---|
54 | /////////////////////////////////////////////////////////////////////////// |
---|
55 | |
---|
56 | #include <systemc> |
---|
57 | #include <cassert> |
---|
58 | #include "vci_buffers.h" |
---|
59 | #include "../include/vci_local_crossbar.h" |
---|
60 | #include "alloc_elems.h" |
---|
61 | |
---|
62 | namespace soclib { namespace caba { |
---|
63 | |
---|
64 | using soclib::common::alloc_elems; |
---|
65 | using soclib::common::dealloc_elems; |
---|
66 | |
---|
67 | using namespace sc_core; |
---|
68 | |
---|
69 | //////////////////////////////////////////////// |
---|
70 | template<typename pkt_t> |
---|
71 | class SimpleCrossbar |
---|
72 | //////////////////////////////////////////////// |
---|
73 | { |
---|
74 | const size_t m_cluster_id; // cluster index |
---|
75 | const size_t m_in_size; // total number of inputs (local + global) |
---|
76 | const size_t m_out_size; // total number of outputs (local + global) |
---|
77 | const void* m_rt; // routing table if cmd / masking table if rsp |
---|
78 | const void* m_lt; // locality table if cmd / id_locality table if rsp |
---|
79 | const bool m_is_cmd; // cmd crossbar when true |
---|
80 | |
---|
81 | sc_signal<bool>* r_allocated; // for each output port: allocation state |
---|
82 | sc_signal<size_t>* r_origin; // for each output port: input port index |
---|
83 | sc_signal<bool>* r_bc_state; // for each input port: broadcast requested |
---|
84 | sc_signal<size_t>* r_bc_count; // for each input port: requested output index |
---|
85 | |
---|
86 | public: |
---|
87 | //////////////////////////////// |
---|
88 | SimpleCrossbar( size_t cluster_id, // cluster index |
---|
89 | size_t in_size, // number of inputs |
---|
90 | size_t out_size, // number of outputs |
---|
91 | void* rt, // routing table |
---|
92 | void* lt, // locality table |
---|
93 | bool is_cmd ) |
---|
94 | : m_cluster_id( cluster_id ), |
---|
95 | m_in_size( in_size ), |
---|
96 | m_out_size( out_size ), |
---|
97 | m_rt( rt ), |
---|
98 | m_lt( lt ), |
---|
99 | m_is_cmd( is_cmd ) |
---|
100 | { |
---|
101 | r_allocated = new sc_signal<bool>[out_size]; |
---|
102 | r_origin = new sc_signal<size_t>[out_size]; |
---|
103 | r_bc_state = new sc_signal<bool>[in_size]; |
---|
104 | r_bc_count = new sc_signal<size_t>[in_size]; |
---|
105 | } // end constructor |
---|
106 | |
---|
107 | //////////// |
---|
108 | void reset() |
---|
109 | { |
---|
110 | for (size_t i=0; i<m_out_size; ++i) |
---|
111 | { |
---|
112 | r_origin[i] = 0; |
---|
113 | r_allocated[i] = false; |
---|
114 | } |
---|
115 | for (size_t i=0; i<m_in_size; ++i) |
---|
116 | { |
---|
117 | r_bc_state[i] = false; |
---|
118 | r_bc_count[i] = 0; |
---|
119 | } |
---|
120 | } // end reset() |
---|
121 | |
---|
122 | ////////////////// |
---|
123 | void print_trace() |
---|
124 | { |
---|
125 | for( size_t out=0 ; out<m_out_size ; out++) |
---|
126 | { |
---|
127 | if( r_allocated[out].read() ) |
---|
128 | { |
---|
129 | if( m_is_cmd ) std::cout << std::dec |
---|
130 | << "initiator " << r_origin[out].read() |
---|
131 | << " => target " << out; |
---|
132 | else std::cout << std::dec |
---|
133 | << "target " << r_origin[out].read() |
---|
134 | << " => initiator " << out; |
---|
135 | } |
---|
136 | } |
---|
137 | for ( size_t in=0 ; in<m_in_size ; in++) |
---|
138 | { |
---|
139 | if( r_bc_state[in].read() ) |
---|
140 | { |
---|
141 | if( m_is_cmd ) std::cout << " broadcast request from initiator " << in |
---|
142 | << " requesting target " |
---|
143 | << r_bc_count[in].read(); |
---|
144 | else std::cout << " broadcast request from target " << in |
---|
145 | << " requesting initiator " |
---|
146 | << r_bc_count[in].read(); |
---|
147 | } |
---|
148 | } |
---|
149 | } // end print_trace() |
---|
150 | |
---|
151 | ////////////////////////// |
---|
152 | size_t route( pkt_t flit ) |
---|
153 | { |
---|
154 | if( m_is_cmd ) // we use a 64 bits AddressDecodingTable for ADDRESS |
---|
155 | { |
---|
156 | soclib::common::AddressDecodingTable<uint64_t, size_t>* rt = |
---|
157 | (soclib::common::AddressDecodingTable<uint64_t, size_t>*)m_rt; |
---|
158 | return rt->get_value( (uint64_t)(flit.dest()) ); |
---|
159 | } |
---|
160 | else // we use a 32 bits AddressDecodingTable for SRCID |
---|
161 | { |
---|
162 | soclib::common::AddressDecodingTable<uint32_t, size_t>* rt = |
---|
163 | (soclib::common::AddressDecodingTable<uint32_t, size_t>*)m_rt; |
---|
164 | return rt->get_value( (uint32_t)(flit.dest()) ); |
---|
165 | } |
---|
166 | } // end route() |
---|
167 | |
---|
168 | /////////////////////////// |
---|
169 | bool is_local( pkt_t flit ) |
---|
170 | { |
---|
171 | if( m_is_cmd ) // we use a 64 bits AddressDecoding Table for ADDRESS |
---|
172 | { |
---|
173 | soclib::common::AddressDecodingTable<uint64_t, bool>* lt = |
---|
174 | (soclib::common::AddressDecodingTable<uint64_t, bool>*)m_lt; |
---|
175 | return lt->get_value( (uint64_t)(flit.dest()) ); |
---|
176 | } |
---|
177 | else // we use a 32 bits AddressDecodingTable for SRCID |
---|
178 | { |
---|
179 | soclib::common::AddressDecodingTable<uint32_t, bool>* lt = |
---|
180 | (soclib::common::AddressDecodingTable<uint32_t, bool>*)m_lt; |
---|
181 | return lt->get_value( (uint32_t)(flit.dest()) ); |
---|
182 | } |
---|
183 | } // end is_local() |
---|
184 | |
---|
185 | ////////////////////////////////////////////////////////////// |
---|
186 | void transition( typename pkt_t::input_port_t **input_port, |
---|
187 | typename pkt_t::output_port_t **output_port ) |
---|
188 | { |
---|
189 | // loop on the input ports to handle r_bc_state[in] and r_bc_count[in] |
---|
190 | for( size_t in = 0 ; in < m_in_size ; in++ ) |
---|
191 | { |
---|
192 | if ( input_port[in]->getVal() ) |
---|
193 | { |
---|
194 | if ( r_bc_state[in].read() ) // pending broadcast |
---|
195 | { |
---|
196 | size_t out = r_bc_count[in]; |
---|
197 | if ( ( r_allocated[out].read() ) && |
---|
198 | ( r_origin[out].read() == in ) && |
---|
199 | ( output_port[out]->toPeerEnd() ) ) // successfully transmitted |
---|
200 | { |
---|
201 | // the broadcast should not be sent to the requester... |
---|
202 | if ( (out == 0) || ((out == 1) && (in == 0)) ) r_bc_state[in] = false; |
---|
203 | else if ( (out-1) != in ) r_bc_count[in] = out-1; |
---|
204 | else r_bc_count[in] = out-2; |
---|
205 | } |
---|
206 | } |
---|
207 | else // no pending proadcast |
---|
208 | { |
---|
209 | pkt_t tmp; |
---|
210 | tmp.readFrom(*input_port[in]); |
---|
211 | if ( tmp.is_broadcast() ) // broadcast request |
---|
212 | { |
---|
213 | assert( input_port[in]->eop && |
---|
214 | "error in vci_local_crossbar : VCI broacast packet must be one flit"); |
---|
215 | |
---|
216 | r_bc_state[in] = true; |
---|
217 | // the broadcast should not be sent to the requester... |
---|
218 | if ( in == m_in_size-1 ) r_bc_count[in] = m_out_size-2; |
---|
219 | else r_bc_count[in] = m_out_size-1; |
---|
220 | } |
---|
221 | } |
---|
222 | } |
---|
223 | } |
---|
224 | |
---|
225 | // loop on the output ports to handle r_allocated[out] and r_origin[out] |
---|
226 | for ( size_t out = 0; out < m_out_size; out++) |
---|
227 | { |
---|
228 | // de-allocation if the last flit is accepted |
---|
229 | if ( r_allocated[out] ) |
---|
230 | { |
---|
231 | if ( output_port[out]->toPeerEnd() ) r_allocated[out] = false; |
---|
232 | } |
---|
233 | // allocation respecting round-robin priority (even for broadcast) |
---|
234 | else |
---|
235 | { |
---|
236 | for(size_t _in = 0; _in < m_in_size; _in++) |
---|
237 | { |
---|
238 | size_t in = (_in + r_origin[out] + 1) % m_in_size; |
---|
239 | if ( input_port[in]->getVal() ) |
---|
240 | { |
---|
241 | pkt_t tmp; |
---|
242 | tmp.readFrom(*input_port[in]); |
---|
243 | |
---|
244 | // broadcast request |
---|
245 | bool bc_req = tmp.is_broadcast() and |
---|
246 | r_bc_state[in].read() and (r_bc_count[in].read() == out); |
---|
247 | |
---|
248 | // to global request |
---|
249 | bool gl_req = not tmp.is_broadcast() and (out == m_out_size-1) and |
---|
250 | not is_local( tmp ) and (in != m_in_size-1); |
---|
251 | |
---|
252 | // to local request |
---|
253 | bool lc_req = not tmp.is_broadcast() and (out == route( tmp )) and |
---|
254 | is_local( tmp ); |
---|
255 | |
---|
256 | // to migrated segment request (to local) |
---|
257 | bool mg_req = not tmp.is_broadcast() and (out == route( tmp )) and |
---|
258 | not is_local( tmp ) and (in == m_in_size-1); |
---|
259 | |
---|
260 | if ( bc_req or gl_req or lc_req or mg_req ) |
---|
261 | { |
---|
262 | r_allocated[out] = true; |
---|
263 | r_origin[out] = in; |
---|
264 | break; |
---|
265 | } |
---|
266 | } |
---|
267 | } |
---|
268 | } |
---|
269 | } |
---|
270 | } // end transition |
---|
271 | |
---|
272 | ///////////////////////////////////////////////////////////// |
---|
273 | void genMealy( typename pkt_t::input_port_t **input_port, |
---|
274 | typename pkt_t::output_port_t **output_port ) |
---|
275 | { |
---|
276 | bool ack[m_in_size]; |
---|
277 | for( size_t in = 0; in < m_in_size; in++) ack[in] = false; |
---|
278 | |
---|
279 | // transmit flits on output ports |
---|
280 | for( size_t out = 0; out < m_out_size; out++) |
---|
281 | { |
---|
282 | if (r_allocated[out]) |
---|
283 | { |
---|
284 | size_t in = r_origin[out]; |
---|
285 | pkt_t tmp; |
---|
286 | tmp.readFrom(*input_port[in]); |
---|
287 | tmp.writeTo(*output_port[out]); |
---|
288 | ack[in] = output_port[out]->getAck(); |
---|
289 | if ( r_bc_state[in].read() ) // its a broacast |
---|
290 | { |
---|
291 | // in case of broadcast, the flit must be consumed only |
---|
292 | // if it is the last output port ... |
---|
293 | ack[in] = ack[in] && ( (out == 0) || ((out == 1) && (in == 0)) ); |
---|
294 | } |
---|
295 | } |
---|
296 | else |
---|
297 | { |
---|
298 | output_port[out]->setVal( false ); |
---|
299 | } |
---|
300 | } |
---|
301 | |
---|
302 | // Send acknowledges on input ports |
---|
303 | for( size_t in = 0; in < m_in_size; in++) input_port[in]->setAck( ack[in] ); |
---|
304 | } // en genmealy |
---|
305 | |
---|
306 | }; // end class SimpleCrossbar |
---|
307 | |
---|
308 | #define tmpl(x) template<typename vci_param> x VciLocalCrossbar<vci_param> |
---|
309 | |
---|
310 | ///////////////////////// |
---|
311 | tmpl(void)::print_trace() |
---|
312 | { |
---|
313 | std::cout << "LOCAL_CROSSBAR " << name() << " / "; |
---|
314 | m_cmd_crossbar->print_trace(); |
---|
315 | m_rsp_crossbar->print_trace(); |
---|
316 | std::cout << std::endl; |
---|
317 | } |
---|
318 | |
---|
319 | //////////////////////// |
---|
320 | tmpl(void)::transition() |
---|
321 | { |
---|
322 | if ( ! p_resetn.read() ) |
---|
323 | { |
---|
324 | m_cmd_crossbar->reset(); |
---|
325 | m_rsp_crossbar->reset(); |
---|
326 | return; |
---|
327 | } |
---|
328 | |
---|
329 | m_cmd_crossbar->transition( m_ports_to_initiator, m_ports_to_target ); |
---|
330 | m_rsp_crossbar->transition( m_ports_to_target, m_ports_to_initiator ); |
---|
331 | } |
---|
332 | |
---|
333 | ////////////////////// |
---|
334 | tmpl(void)::genMealy() |
---|
335 | { |
---|
336 | m_cmd_crossbar->genMealy( m_ports_to_initiator, m_ports_to_target ); |
---|
337 | m_rsp_crossbar->genMealy( m_ports_to_target, m_ports_to_initiator ); |
---|
338 | } |
---|
339 | |
---|
340 | /////////////////////////////////////////////////////////////////////// |
---|
341 | tmpl(/**/)::VciLocalCrossbar( sc_core::sc_module_name name, |
---|
342 | const soclib::common::MappingTable &mt, |
---|
343 | const size_t cluster_id, |
---|
344 | const size_t nb_attached_initiators, |
---|
345 | const size_t nb_attached_targets, |
---|
346 | const size_t default_target_id ) |
---|
347 | : BaseModule(name), |
---|
348 | p_clk("clk"), |
---|
349 | p_resetn("resetn"), |
---|
350 | p_to_target(soclib::common::alloc_elems<VciInitiator<vci_param> >( |
---|
351 | "to_target", nb_attached_targets)), |
---|
352 | p_to_initiator(soclib::common::alloc_elems<VciTarget<vci_param> >( |
---|
353 | "to_initiator", nb_attached_initiators)), |
---|
354 | p_target_to_up("target_to_up"), |
---|
355 | p_initiator_to_up("initiator_to_up"), |
---|
356 | m_nb_attached_initiators(nb_attached_initiators), |
---|
357 | m_nb_attached_targets(nb_attached_targets), |
---|
358 | m_cmd_rt ( mt.getLocalIndexFromAddress( cluster_id, default_target_id ) ), |
---|
359 | m_cmd_lt ( mt.getLocalMatchFromAddress( cluster_id ) ), |
---|
360 | m_rsp_rt ( mt.getLocalIndexFromSrcid( cluster_id ) ), |
---|
361 | m_rsp_lt ( mt.getLocalMatchFromSrcid( cluster_id ) ) |
---|
362 | { |
---|
363 | std::cout << " - Building VciLocalCrossbar " << name << std::dec << std::endl |
---|
364 | << " => cluster_id = " << cluster_id << std::endl |
---|
365 | << " => targets = " << nb_attached_targets << std::endl |
---|
366 | << " => initiators = " << nb_attached_initiators << std::endl |
---|
367 | << " => default target = " << default_target_id << std::endl; |
---|
368 | |
---|
369 | SC_METHOD(transition); |
---|
370 | dont_initialize(); |
---|
371 | sensitive << p_clk.pos(); |
---|
372 | |
---|
373 | SC_METHOD(genMealy); |
---|
374 | dont_initialize(); |
---|
375 | sensitive << p_clk.neg(); |
---|
376 | |
---|
377 | for ( size_t i=0; i<nb_attached_initiators; ++i ) |
---|
378 | sensitive << p_to_initiator[i]; |
---|
379 | for ( size_t i=0; i<nb_attached_targets; ++i ) |
---|
380 | sensitive << p_to_target[i]; |
---|
381 | |
---|
382 | sensitive << p_target_to_up |
---|
383 | << p_initiator_to_up; |
---|
384 | |
---|
385 | // building cmd and rsp crossbars |
---|
386 | m_cmd_crossbar = new SimpleCrossbar<VciCmdBuffer<vci_param> >( |
---|
387 | cluster_id, |
---|
388 | nb_attached_initiators+1, |
---|
389 | nb_attached_targets+1, |
---|
390 | (void*)(&m_cmd_rt), |
---|
391 | (void*)(&m_cmd_lt), |
---|
392 | true ); |
---|
393 | |
---|
394 | m_rsp_crossbar = new SimpleCrossbar<VciRspBuffer<vci_param> >( |
---|
395 | cluster_id, |
---|
396 | nb_attached_targets+1, |
---|
397 | nb_attached_initiators+1, |
---|
398 | (void*)(&m_rsp_rt), |
---|
399 | (void*)(&m_rsp_lt), |
---|
400 | false ); |
---|
401 | |
---|
402 | m_ports_to_initiator = new VciTarget<vci_param>*[nb_attached_initiators+1]; |
---|
403 | for (size_t i=0; i<nb_attached_initiators; ++i) |
---|
404 | m_ports_to_initiator[i] = &p_to_initiator[i]; |
---|
405 | m_ports_to_initiator[nb_attached_initiators] = &p_target_to_up; |
---|
406 | |
---|
407 | m_ports_to_target = new VciInitiator<vci_param>*[nb_attached_targets+1]; |
---|
408 | for (size_t i=0; i<nb_attached_targets; ++i) |
---|
409 | m_ports_to_target[i] = &p_to_target[i]; |
---|
410 | m_ports_to_target[nb_attached_targets] = &p_initiator_to_up; |
---|
411 | } |
---|
412 | |
---|
413 | /////////////////////////////// |
---|
414 | tmpl(/**/)::~VciLocalCrossbar() |
---|
415 | { |
---|
416 | soclib::common::dealloc_elems(p_to_initiator, m_nb_attached_initiators); |
---|
417 | soclib::common::dealloc_elems(p_to_target, m_nb_attached_targets); |
---|
418 | } |
---|
419 | |
---|
420 | }} |
---|
421 | |
---|
422 | // Local Variables: |
---|
423 | // tab-width: 4 |
---|
424 | // c-basic-offset: 4 |
---|
425 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
---|
426 | // indent-tabs-mode: nil |
---|
427 | // End: |
---|
428 | |
---|
429 | // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
---|