atomic.cc revision 3512 
1/*
2 * Copyright (c) 2002-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Steve Reinhardt
29 */
30
31#include "arch/locked_mem.hh"
32#include "arch/utility.hh"
33#include "cpu/exetrace.hh"
34#include "cpu/simple/atomic.hh"
35#include "mem/packet.hh"
36#include "mem/packet_access.hh"
37#include "sim/builder.hh"
38#include "sim/system.hh"
39
40using namespace std;
41using namespace TheISA;
42
43AtomicSimpleCPU::TickEvent::TickEvent(AtomicSimpleCPU *c)
44    : Event(&mainEventQueue, CPU_Tick_Pri), cpu(c)
45{
46}
47
48
49void
50AtomicSimpleCPU::TickEvent::process()
51{
52    cpu->tick();
53}
54
55const char *
56AtomicSimpleCPU::TickEvent::description()
57{
58    return "AtomicSimpleCPU tick event";
59}
60
61Port *
62AtomicSimpleCPU::getPort(const std::string &if_name, int idx)
63{
64    if (if_name == "dcache_port")
65        return &dcachePort;
66    else if (if_name == "icache_port")
67        return &icachePort;
68    else
69        panic("No Such Port\n");
70}
71
72void
73AtomicSimpleCPU::init()
74{
75    BaseCPU::init();
76#if FULL_SYSTEM
77    for (int i = 0; i < threadContexts.size(); ++i) {
78        ThreadContext *tc = threadContexts[i];
79
80        // initialize CPU, including PC
81        TheISA::initCPU(tc, tc->readCpuId());
82    }
83#endif
84}
85
86bool
87AtomicSimpleCPU::CpuPort::recvTiming(PacketPtr pkt)
88{
89    panic("AtomicSimpleCPU doesn't expect recvTiming callback!");
90    return true;
91}
92
93Tick
94AtomicSimpleCPU::CpuPort::recvAtomic(PacketPtr pkt)
95{
96    //Snooping a coherence request, just return
97    return curTick;
98}
99
100void
101AtomicSimpleCPU::CpuPort::recvFunctional(PacketPtr pkt)
102{
103    //No internal storage to update, just return
104    return;
105}
106
107void
108AtomicSimpleCPU::CpuPort::recvStatusChange(Status status)
109{
110    if (status == RangeChange)
111        return;
112
113    panic("AtomicSimpleCPU doesn't expect recvStatusChange callback!");
114}
115
116void
117AtomicSimpleCPU::CpuPort::recvRetry()
118{
119    panic("AtomicSimpleCPU doesn't expect recvRetry callback!");
120}
121
122
123AtomicSimpleCPU::AtomicSimpleCPU(Params *p)
124    : BaseSimpleCPU(p), tickEvent(this),
125      width(p->width), simulate_stalls(p->simulate_stalls),
126      icachePort(name() + "-iport", this), dcachePort(name() + "-iport", this)
127{
128    _status = Idle;
129
130    ifetch_req = new Request();
131    ifetch_req->setThreadContext(p->cpu_id, 0); // Add thread ID if we add MT
132    ifetch_pkt = new Packet(ifetch_req, Packet::ReadReq, Packet::Broadcast);
133    ifetch_pkt->dataStatic(&inst);
134
135    data_read_req = new Request();
136    data_read_req->setThreadContext(p->cpu_id, 0); // Add thread ID here too
137    data_read_pkt = new Packet(data_read_req, Packet::ReadReq,
138                               Packet::Broadcast);
139    data_read_pkt->dataStatic(&dataReg);
140
141    data_write_req = new Request();
142    data_write_req->setThreadContext(p->cpu_id, 0); // Add thread ID here too
143    data_write_pkt = new Packet(data_write_req, Packet::WriteReq,
144                                Packet::Broadcast);
145}
146
147
148AtomicSimpleCPU::~AtomicSimpleCPU()
149{
150}
151
152void
153AtomicSimpleCPU::serialize(ostream &os)
154{
155    SimObject::State so_state = SimObject::getState();
156    SERIALIZE_ENUM(so_state);
157    Status _status = status();
158    SERIALIZE_ENUM(_status);
159    BaseSimpleCPU::serialize(os);
160    nameOut(os, csprintf("%s.tickEvent", name()));
161    tickEvent.serialize(os);
162}
163
164void
165AtomicSimpleCPU::unserialize(Checkpoint *cp, const string &section)
166{
167    SimObject::State so_state;
168    UNSERIALIZE_ENUM(so_state);
169    UNSERIALIZE_ENUM(_status);
170    BaseSimpleCPU::unserialize(cp, section);
171    tickEvent.unserialize(cp, csprintf("%s.tickEvent", section));
172}
173
174void
175AtomicSimpleCPU::resume()
176{
177    if (_status != SwitchedOut && _status != Idle) {
178        assert(system->getMemoryMode() == System::Atomic);
179
180        changeState(SimObject::Running);
181        if (thread->status() == ThreadContext::Active) {
182            if (!tickEvent.scheduled()) {
183                tickEvent.schedule(nextCycle());
184            }
185        }
186    }
187}
188
189void
190AtomicSimpleCPU::switchOut()
191{
192    assert(status() == Running || status() == Idle);
193    _status = SwitchedOut;
194
195    tickEvent.squash();
196}
197
198
199void
200AtomicSimpleCPU::takeOverFrom(BaseCPU *oldCPU)
201{
202    BaseCPU::takeOverFrom(oldCPU);
203
204    assert(!tickEvent.scheduled());
205
206    // if any of this CPU's ThreadContexts are active, mark the CPU as
207    // running and schedule its tick event.
208    for (int i = 0; i < threadContexts.size(); ++i) {
209        ThreadContext *tc = threadContexts[i];
210        if (tc->status() == ThreadContext::Active && _status != Running) {
211            _status = Running;
212            tickEvent.schedule(nextCycle());
213            break;
214        }
215    }
216    if (_status != Running) {
217        _status = Idle;
218    }
219}
220
221
222void
223AtomicSimpleCPU::activateContext(int thread_num, int delay)
224{
225    assert(thread_num == 0);
226    assert(thread);
227
228    assert(_status == Idle);
229    assert(!tickEvent.scheduled());
230
231    notIdleFraction++;
232    //Make sure ticks are still on multiples of cycles
233    tickEvent.schedule(nextCycle(curTick + cycles(delay)));
234    _status = Running;
235}
236
237
238void
239AtomicSimpleCPU::suspendContext(int thread_num)
240{
241    assert(thread_num == 0);
242    assert(thread);
243
244    assert(_status == Running);
245
246    // tick event may not be scheduled if this gets called from inside
247    // an instruction's execution, e.g. "quiesce"
248    if (tickEvent.scheduled())
249        tickEvent.deschedule();
250
251    notIdleFraction--;
252    _status = Idle;
253}
254
255
256template <class T>
257Fault
258AtomicSimpleCPU::read(Addr addr, T &data, unsigned flags)
259{
260    // use the CPU's statically allocated read request and packet objects
261    Request *req = data_read_req;
262    PacketPtr pkt = data_read_pkt;
263
264    req->setVirt(0, addr, sizeof(T), flags, thread->readPC());
265
266    if (traceData) {
267        traceData->setAddr(addr);
268    }
269
270    // translate to physical address
271    Fault fault = thread->translateDataReadReq(req);
272
273    // Now do the access.
274    if (fault == NoFault) {
275        pkt->reinitFromRequest();
276
277        dcache_latency = dcachePort.sendAtomic(pkt);
278        dcache_access = true;
279
280        assert(pkt->result == Packet::Success);
281        data = pkt->get<T>();
282
283        if (req->isLocked()) {
284            TheISA::handleLockedRead(thread, req);
285        }
286    }
287
288    // This will need a new way to tell if it has a dcache attached.
289    if (req->isUncacheable())
290        recordEvent("Uncached Read");
291
292    return fault;
293}
294
295#ifndef DOXYGEN_SHOULD_SKIP_THIS
296
297template
298Fault
299AtomicSimpleCPU::read(Addr addr, uint64_t &data, unsigned flags);
300
301template
302Fault
303AtomicSimpleCPU::read(Addr addr, uint32_t &data, unsigned flags);
304
305template
306Fault
307AtomicSimpleCPU::read(Addr addr, uint16_t &data, unsigned flags);
308
309template
310Fault
311AtomicSimpleCPU::read(Addr addr, uint8_t &data, unsigned flags);
312
313#endif //DOXYGEN_SHOULD_SKIP_THIS
314
315template<>
316Fault
317AtomicSimpleCPU::read(Addr addr, double &data, unsigned flags)
318{
319    return read(addr, *(uint64_t*)&data, flags);
320}
321
322template<>
323Fault
324AtomicSimpleCPU::read(Addr addr, float &data, unsigned flags)
325{
326    return read(addr, *(uint32_t*)&data, flags);
327}
328
329
330template<>
331Fault
332AtomicSimpleCPU::read(Addr addr, int32_t &data, unsigned flags)
333{
334    return read(addr, (uint32_t&)data, flags);
335}
336
337
338template <class T>
339Fault
340AtomicSimpleCPU::write(T data, Addr addr, unsigned flags, uint64_t *res)
341{
342    // use the CPU's statically allocated write request and packet objects
343    Request *req = data_write_req;
344    PacketPtr pkt = data_write_pkt;
345
346    req->setVirt(0, addr, sizeof(T), flags, thread->readPC());
347
348    if (traceData) {
349        traceData->setAddr(addr);
350    }
351
352    // translate to physical address
353    Fault fault = thread->translateDataWriteReq(req);
354
355    // Now do the access.
356    if (fault == NoFault) {
357        bool do_access = true;  // flag to suppress cache access
358
359        if (req->isLocked()) {
360            do_access = TheISA::handleLockedWrite(thread, req);
361        }
362
363        if (do_access) {
364            data = htog(data);
365            pkt->reinitFromRequest();
366            pkt->dataStatic(&data);
367
368            dcache_latency = dcachePort.sendAtomic(pkt);
369            dcache_access = true;
370
371            assert(pkt->result == Packet::Success);
372        }
373
374        if (req->isLocked()) {
375            uint64_t scResult = req->getScResult();
376            if (scResult != 0) {
377                // clear failure counter
378                thread->setStCondFailures(0);
379            }
380            if (res) {
381                *res = req->getScResult();
382            }
383        }
384    }
385
386    // This will need a new way to tell if it's hooked up to a cache or not.
387    if (req->isUncacheable())
388        recordEvent("Uncached Write");
389
390    // If the write needs to have a fault on the access, consider calling
391    // changeStatus() and changing it to "bad addr write" or something.
392    return fault;
393}
394
395
396#ifndef DOXYGEN_SHOULD_SKIP_THIS
397template
398Fault
399AtomicSimpleCPU::write(uint64_t data, Addr addr,
400                       unsigned flags, uint64_t *res);
401
402template
403Fault
404AtomicSimpleCPU::write(uint32_t data, Addr addr,
405                       unsigned flags, uint64_t *res);
406
407template
408Fault
409AtomicSimpleCPU::write(uint16_t data, Addr addr,
410                       unsigned flags, uint64_t *res);
411
412template
413Fault
414AtomicSimpleCPU::write(uint8_t data, Addr addr,
415                       unsigned flags, uint64_t *res);
416
417#endif //DOXYGEN_SHOULD_SKIP_THIS
418
419template<>
420Fault
421AtomicSimpleCPU::write(double data, Addr addr, unsigned flags, uint64_t *res)
422{
423    return write(*(uint64_t*)&data, addr, flags, res);
424}
425
426template<>
427Fault
428AtomicSimpleCPU::write(float data, Addr addr, unsigned flags, uint64_t *res)
429{
430    return write(*(uint32_t*)&data, addr, flags, res);
431}
432
433
434template<>
435Fault
436AtomicSimpleCPU::write(int32_t data, Addr addr, unsigned flags, uint64_t *res)
437{
438    return write((uint32_t)data, addr, flags, res);
439}
440
441
442void
443AtomicSimpleCPU::tick()
444{
445    Tick latency = cycles(1); // instruction takes one cycle by default
446
447    for (int i = 0; i < width; ++i) {
448        numCycles++;
449
450        if (!curStaticInst || !curStaticInst->isDelayedCommit())
451            checkForInterrupts();
452
453        Fault fault = setupFetchRequest(ifetch_req);
454
455        if (fault == NoFault) {
456            ifetch_pkt->reinitFromRequest();
457
458            Tick icache_latency = icachePort.sendAtomic(ifetch_pkt);
459            // ifetch_req is initialized to read the instruction directly
460            // into the CPU object's inst field.
461
462            dcache_access = false; // assume no dcache access
463            preExecute();
464            fault = curStaticInst->execute(this, traceData);
465            postExecute();
466
467            if (simulate_stalls) {
468                Tick icache_stall = icache_latency - cycles(1);
469                Tick dcache_stall =
470                    dcache_access ? dcache_latency - cycles(1) : 0;
471                Tick stall_cycles = (icache_stall + dcache_stall) / cycles(1);
472                if (cycles(stall_cycles) < (icache_stall + dcache_stall))
473                    latency += cycles(stall_cycles+1);
474                else
475                    latency += cycles(stall_cycles);
476            }
477
478        }
479
480        advancePC(fault);
481    }
482
483    if (_status != Idle)
484        tickEvent.schedule(curTick + latency);
485}
486
487
488////////////////////////////////////////////////////////////////////////
489//
490//  AtomicSimpleCPU Simulation Object
491//
492BEGIN_DECLARE_SIM_OBJECT_PARAMS(AtomicSimpleCPU)
493
494    Param<Counter> max_insts_any_thread;
495    Param<Counter> max_insts_all_threads;
496    Param<Counter> max_loads_any_thread;
497    Param<Counter> max_loads_all_threads;
498    Param<Tick> progress_interval;
499    SimObjectParam<System *> system;
500    Param<int> cpu_id;
501
502#if FULL_SYSTEM
503    SimObjectParam<TheISA::ITB *> itb;
504    SimObjectParam<TheISA::DTB *> dtb;
505    Param<Tick> profile;
506#else
507    SimObjectParam<Process *> workload;
508#endif // FULL_SYSTEM
509
510    Param<int> clock;
511
512    Param<bool> defer_registration;
513    Param<int> width;
514    Param<bool> function_trace;
515    Param<Tick> function_trace_start;
516    Param<bool> simulate_stalls;
517
518END_DECLARE_SIM_OBJECT_PARAMS(AtomicSimpleCPU)
519
520BEGIN_INIT_SIM_OBJECT_PARAMS(AtomicSimpleCPU)
521
522    INIT_PARAM(max_insts_any_thread,
523               "terminate when any thread reaches this inst count"),
524    INIT_PARAM(max_insts_all_threads,
525               "terminate when all threads have reached this inst count"),
526    INIT_PARAM(max_loads_any_thread,
527               "terminate when any thread reaches this load count"),
528    INIT_PARAM(max_loads_all_threads,
529               "terminate when all threads have reached this load count"),
530    INIT_PARAM(progress_interval, "Progress interval"),
531    INIT_PARAM(system, "system object"),
532    INIT_PARAM(cpu_id, "processor ID"),
533
534#if FULL_SYSTEM
535    INIT_PARAM(itb, "Instruction TLB"),
536    INIT_PARAM(dtb, "Data TLB"),
537    INIT_PARAM(profile, ""),
538#else
539    INIT_PARAM(workload, "processes to run"),
540#endif // FULL_SYSTEM
541
542    INIT_PARAM(clock, "clock speed"),
543    INIT_PARAM(defer_registration, "defer system registration (for sampling)"),
544    INIT_PARAM(width, "cpu width"),
545    INIT_PARAM(function_trace, "Enable function trace"),
546    INIT_PARAM(function_trace_start, "Cycle to start function trace"),
547    INIT_PARAM(simulate_stalls, "Simulate cache stall cycles")
548
549END_INIT_SIM_OBJECT_PARAMS(AtomicSimpleCPU)
550
551
552CREATE_SIM_OBJECT(AtomicSimpleCPU)
553{
554    AtomicSimpleCPU::Params *params = new AtomicSimpleCPU::Params();
555    params->name = getInstanceName();
556    params->numberOfThreads = 1;
557    params->max_insts_any_thread = max_insts_any_thread;
558    params->max_insts_all_threads = max_insts_all_threads;
559    params->max_loads_any_thread = max_loads_any_thread;
560    params->max_loads_all_threads = max_loads_all_threads;
561    params->progress_interval = progress_interval;
562    params->deferRegistration = defer_registration;
563    params->clock = clock;
564    params->functionTrace = function_trace;
565    params->functionTraceStart = function_trace_start;
566    params->width = width;
567    params->simulate_stalls = simulate_stalls;
568    params->system = system;
569    params->cpu_id = cpu_id;
570
571#if FULL_SYSTEM
572    params->itb = itb;
573    params->dtb = dtb;
574    params->profile = profile;
575#else
576    params->process = workload;
577#endif
578
579    AtomicSimpleCPU *cpu = new AtomicSimpleCPU(params);
580    return cpu;
581}
582
583REGISTER_SIM_OBJECT("AtomicSimpleCPU", AtomicSimpleCPU)
584
585