abstract_mem.cc revision 7730
1/* 2 * Copyright (c) 2001-2005 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: Ron Dreslinski 29 * Ali Saidi 30 */ 31 32#include <sys/types.h> 33#include <sys/mman.h> 34#include <sys/user.h> 35#include <errno.h> 36#include <fcntl.h> 37#include <unistd.h> 38#include <zlib.h> 39 40#include <cstdio> 41#include <iostream> 42#include <string> 43 44#include "arch/registers.hh" 45#include "base/intmath.hh" 46#include "base/misc.hh" 47#include "base/random.hh" 48#include "base/types.hh" 49#include "config/full_system.hh" 50#include "config/the_isa.hh" 51#include "mem/packet_access.hh" 52#include "mem/physical.hh" 53#include "sim/eventq.hh" 54 55using namespace std; 56using namespace TheISA; 57 58PhysicalMemory::PhysicalMemory(const Params *p) 59 : MemObject(p), pmemAddr(NULL), pagePtr(0), 60 lat(p->latency), lat_var(p->latency_var), 61 _size(params()->range.size()), _start(params()->range.start) 62{ 63 if (size() % TheISA::PageBytes != 0) 64 panic("Memory Size not divisible by page size\n"); 65 66 if (params()->null) 67 return; 68 69 70 if (params()->file == "") { 71 int map_flags = MAP_ANON | MAP_PRIVATE; 72 pmemAddr = (uint8_t *)mmap(NULL, size(), 73 PROT_READ | PROT_WRITE, map_flags, -1, 0); 74 } else { 75 int map_flags = MAP_PRIVATE; 76 int fd = open(params()->file.c_str(), O_RDONLY); 77 _size = lseek(fd, 0, SEEK_END); 78 lseek(fd, 0, SEEK_SET); 79 pmemAddr = (uint8_t *)mmap(NULL, roundUp(size(), PAGE_SIZE), 80 PROT_READ | PROT_WRITE, map_flags, fd, 0); 81 } 82 83 if (pmemAddr == (void *)MAP_FAILED) { 84 perror("mmap"); 85 if (params()->file == "") 86 fatal("Could not mmap!\n"); 87 else 88 fatal("Could not find file: %s\n", params()->file); 89 } 90 91 //If requested, initialize all the memory to 0 92 if (p->zero) 93 memset(pmemAddr, 0, size()); 94} 95 96void 97PhysicalMemory::init() 98{ 99 if (ports.size() == 0) { 100 fatal("PhysicalMemory object %s is unconnected!", name()); 101 } 102 103 for (PortIterator pi = ports.begin(); pi != ports.end(); ++pi) { 104 if (*pi) 105 (*pi)->sendStatusChange(Port::RangeChange); 106 } 107} 108 109PhysicalMemory::~PhysicalMemory() 110{ 111 if (pmemAddr) 112 munmap((char*)pmemAddr, size()); 113} 114 115Addr 116PhysicalMemory::new_page() 117{ 118 Addr return_addr = pagePtr << LogVMPageSize; 119 return_addr += start(); 120 121 ++pagePtr; 122 return return_addr; 123} 124 125unsigned 126PhysicalMemory::deviceBlockSize() const 127{ 128 //Can accept anysize request 129 return 0; 130} 131 132Tick 133PhysicalMemory::calculateLatency(PacketPtr pkt) 134{ 135 Tick latency = lat; 136 if (lat_var != 0) 137 latency += random_mt.random<Tick>(0, lat_var); 138 return latency; 139} 140 141 142 143// Add load-locked to tracking list. Should only be called if the 144// operation is a load and the LLSC flag is set. 145void 146PhysicalMemory::trackLoadLocked(PacketPtr pkt) 147{ 148 Request *req = pkt->req; 149 Addr paddr = LockedAddr::mask(req->getPaddr()); 150 151 // first we check if we already have a locked addr for this 152 // xc. Since each xc only gets one, we just update the 153 // existing record with the new address. 154 list<LockedAddr>::iterator i; 155 156 for (i = lockedAddrList.begin(); i != lockedAddrList.end(); ++i) { 157 if (i->matchesContext(req)) { 158 DPRINTF(LLSC, "Modifying lock record: context %d addr %#x\n", 159 req->contextId(), paddr); 160 i->addr = paddr; 161 return; 162 } 163 } 164 165 // no record for this xc: need to allocate a new one 166 DPRINTF(LLSC, "Adding lock record: context %d addr %#x\n", 167 req->contextId(), paddr); 168 lockedAddrList.push_front(LockedAddr(req)); 169} 170 171 172// Called on *writes* only... both regular stores and 173// store-conditional operations. Check for conventional stores which 174// conflict with locked addresses, and for success/failure of store 175// conditionals. 176bool 177PhysicalMemory::checkLockedAddrList(PacketPtr pkt) 178{ 179 Request *req = pkt->req; 180 Addr paddr = LockedAddr::mask(req->getPaddr()); 181 bool isLLSC = pkt->isLLSC(); 182 183 // Initialize return value. Non-conditional stores always 184 // succeed. Assume conditional stores will fail until proven 185 // otherwise. 186 bool success = !isLLSC; 187 188 // Iterate over list. Note that there could be multiple matching 189 // records, as more than one context could have done a load locked 190 // to this location. 191 list<LockedAddr>::iterator i = lockedAddrList.begin(); 192 193 while (i != lockedAddrList.end()) { 194 195 if (i->addr == paddr) { 196 // we have a matching address 197 198 if (isLLSC && i->matchesContext(req)) { 199 // it's a store conditional, and as far as the memory 200 // system can tell, the requesting context's lock is 201 // still valid. 202 DPRINTF(LLSC, "StCond success: context %d addr %#x\n", 203 req->contextId(), paddr); 204 success = true; 205 } 206 207 // Get rid of our record of this lock and advance to next 208 DPRINTF(LLSC, "Erasing lock record: context %d addr %#x\n", 209 i->contextId, paddr); 210 i = lockedAddrList.erase(i); 211 } 212 else { 213 // no match: advance to next record 214 ++i; 215 } 216 } 217 218 if (isLLSC) { 219 req->setExtraData(success ? 1 : 0); 220 } 221 222 return success; 223} 224 225 226#if TRACING_ON 227 228#define CASE(A, T) \ 229 case sizeof(T): \ 230 DPRINTF(MemoryAccess,"%s of size %i on address 0x%x data 0x%x\n", \ 231 A, pkt->getSize(), pkt->getAddr(), pkt->get<T>()); \ 232 break 233 234 235#define TRACE_PACKET(A) \ 236 do { \ 237 switch (pkt->getSize()) { \ 238 CASE(A, uint64_t); \ 239 CASE(A, uint32_t); \ 240 CASE(A, uint16_t); \ 241 CASE(A, uint8_t); \ 242 default: \ 243 DPRINTF(MemoryAccess, "%s of size %i on address 0x%x\n", \ 244 A, pkt->getSize(), pkt->getAddr()); \ 245 } \ 246 } while (0) 247 248#else 249 250#define TRACE_PACKET(A) 251 252#endif 253 254Tick 255PhysicalMemory::doAtomicAccess(PacketPtr pkt) 256{ 257 assert(pkt->getAddr() >= start() && 258 pkt->getAddr() + pkt->getSize() <= start() + size()); 259 260 if (pkt->memInhibitAsserted()) { 261 DPRINTF(MemoryAccess, "mem inhibited on 0x%x: not responding\n", 262 pkt->getAddr()); 263 return 0; 264 } 265 266 uint8_t *hostAddr = pmemAddr + pkt->getAddr() - start(); 267 268 if (pkt->cmd == MemCmd::SwapReq) { 269 IntReg overwrite_val; 270 bool overwrite_mem; 271 uint64_t condition_val64; 272 uint32_t condition_val32; 273 274 if (!pmemAddr) 275 panic("Swap only works if there is real memory (i.e. null=False)"); 276 assert(sizeof(IntReg) >= pkt->getSize()); 277 278 overwrite_mem = true; 279 // keep a copy of our possible write value, and copy what is at the 280 // memory address into the packet 281 std::memcpy(&overwrite_val, pkt->getPtr<uint8_t>(), pkt->getSize()); 282 std::memcpy(pkt->getPtr<uint8_t>(), hostAddr, pkt->getSize()); 283 284 if (pkt->req->isCondSwap()) { 285 if (pkt->getSize() == sizeof(uint64_t)) { 286 condition_val64 = pkt->req->getExtraData(); 287 overwrite_mem = !std::memcmp(&condition_val64, hostAddr, 288 sizeof(uint64_t)); 289 } else if (pkt->getSize() == sizeof(uint32_t)) { 290 condition_val32 = (uint32_t)pkt->req->getExtraData(); 291 overwrite_mem = !std::memcmp(&condition_val32, hostAddr, 292 sizeof(uint32_t)); 293 } else 294 panic("Invalid size for conditional read/write\n"); 295 } 296 297 if (overwrite_mem) 298 std::memcpy(hostAddr, &overwrite_val, pkt->getSize()); 299 300 assert(!pkt->req->isInstFetch()); 301 TRACE_PACKET("Read/Write"); 302 } else if (pkt->isRead()) { 303 assert(!pkt->isWrite()); 304 if (pkt->isLLSC()) { 305 trackLoadLocked(pkt); 306 } 307 if (pmemAddr) 308 memcpy(pkt->getPtr<uint8_t>(), hostAddr, pkt->getSize()); 309 TRACE_PACKET(pkt->req->isInstFetch() ? "IFetch" : "Read"); 310 } else if (pkt->isWrite()) { 311 if (writeOK(pkt)) { 312 if (pmemAddr) 313 memcpy(hostAddr, pkt->getPtr<uint8_t>(), pkt->getSize()); 314 assert(!pkt->req->isInstFetch()); 315 TRACE_PACKET("Write"); 316 } 317 } else if (pkt->isInvalidate()) { 318 //upgrade or invalidate 319 if (pkt->needsResponse()) { 320 pkt->makeAtomicResponse(); 321 } 322 } else { 323 panic("unimplemented"); 324 } 325 326 if (pkt->needsResponse()) { 327 pkt->makeAtomicResponse(); 328 } 329 return calculateLatency(pkt); 330} 331 332 333void 334PhysicalMemory::doFunctionalAccess(PacketPtr pkt) 335{ 336 assert(pkt->getAddr() >= start() && 337 pkt->getAddr() + pkt->getSize() <= start() + size()); 338 339 340 uint8_t *hostAddr = pmemAddr + pkt->getAddr() - start(); 341 342 if (pkt->isRead()) { 343 if (pmemAddr) 344 memcpy(pkt->getPtr<uint8_t>(), hostAddr, pkt->getSize()); 345 TRACE_PACKET("Read"); 346 pkt->makeAtomicResponse(); 347 } else if (pkt->isWrite()) { 348 if (pmemAddr) 349 memcpy(hostAddr, pkt->getPtr<uint8_t>(), pkt->getSize()); 350 TRACE_PACKET("Write"); 351 pkt->makeAtomicResponse(); 352 } else if (pkt->isPrint()) { 353 Packet::PrintReqState *prs = 354 dynamic_cast<Packet::PrintReqState*>(pkt->senderState); 355 // Need to call printLabels() explicitly since we're not going 356 // through printObj(). 357 prs->printLabels(); 358 // Right now we just print the single byte at the specified address. 359 ccprintf(prs->os, "%s%#x\n", prs->curPrefix(), *hostAddr); 360 } else { 361 panic("PhysicalMemory: unimplemented functional command %s", 362 pkt->cmdString()); 363 } 364} 365 366 367Port * 368PhysicalMemory::getPort(const std::string &if_name, int idx) 369{ 370 // Accept request for "functional" port for backwards compatibility 371 // with places where this function is called from C++. I'd prefer 372 // to move all these into Python someday. 373 if (if_name == "functional") { 374 return new MemoryPort(csprintf("%s-functional", name()), this); 375 } 376 377 if (if_name != "port") { 378 panic("PhysicalMemory::getPort: unknown port %s requested", if_name); 379 } 380 381 if (idx >= (int)ports.size()) { 382 ports.resize(idx + 1); 383 } 384 385 if (ports[idx] != NULL) { 386 panic("PhysicalMemory::getPort: port %d already assigned", idx); 387 } 388 389 MemoryPort *port = 390 new MemoryPort(csprintf("%s-port%d", name(), idx), this); 391 392 ports[idx] = port; 393 return port; 394} 395 396 397void 398PhysicalMemory::recvStatusChange(Port::Status status) 399{ 400} 401 402PhysicalMemory::MemoryPort::MemoryPort(const std::string &_name, 403 PhysicalMemory *_memory) 404 : SimpleTimingPort(_name, _memory), memory(_memory) 405{ } 406 407void 408PhysicalMemory::MemoryPort::recvStatusChange(Port::Status status) 409{ 410 memory->recvStatusChange(status); 411} 412 413void 414PhysicalMemory::MemoryPort::getDeviceAddressRanges(AddrRangeList &resp, 415 bool &snoop) 416{ 417 memory->getAddressRanges(resp, snoop); 418} 419 420void 421PhysicalMemory::getAddressRanges(AddrRangeList &resp, bool &snoop) 422{ 423 snoop = false; 424 resp.clear(); 425 resp.push_back(RangeSize(start(), size())); 426} 427 428unsigned 429PhysicalMemory::MemoryPort::deviceBlockSize() const 430{ 431 return memory->deviceBlockSize(); 432} 433 434Tick 435PhysicalMemory::MemoryPort::recvAtomic(PacketPtr pkt) 436{ 437 return memory->doAtomicAccess(pkt); 438} 439 440void 441PhysicalMemory::MemoryPort::recvFunctional(PacketPtr pkt) 442{ 443 pkt->pushLabel(memory->name()); 444 445 if (!checkFunctional(pkt)) { 446 // Default implementation of SimpleTimingPort::recvFunctional() 447 // calls recvAtomic() and throws away the latency; we can save a 448 // little here by just not calculating the latency. 449 memory->doFunctionalAccess(pkt); 450 } 451 452 pkt->popLabel(); 453} 454 455unsigned int 456PhysicalMemory::drain(Event *de) 457{ 458 int count = 0; 459 for (PortIterator pi = ports.begin(); pi != ports.end(); ++pi) { 460 count += (*pi)->drain(de); 461 } 462 463 if (count) 464 changeState(Draining); 465 else 466 changeState(Drained); 467 return count; 468} 469 470void 471PhysicalMemory::serialize(ostream &os) 472{ 473 if (!pmemAddr) 474 return; 475 476 gzFile compressedMem; 477 string filename = name() + ".physmem"; 478 479 SERIALIZE_SCALAR(filename); 480 SERIALIZE_SCALAR(_size); 481 482 // write memory file 483 string thefile = Checkpoint::dir() + "/" + filename.c_str(); 484 int fd = creat(thefile.c_str(), 0664); 485 if (fd < 0) { 486 perror("creat"); 487 fatal("Can't open physical memory checkpoint file '%s'\n", filename); 488 } 489 490 compressedMem = gzdopen(fd, "wb"); 491 if (compressedMem == NULL) 492 fatal("Insufficient memory to allocate compression state for %s\n", 493 filename); 494 495 if (gzwrite(compressedMem, pmemAddr, size()) != (int)size()) { 496 fatal("Write failed on physical memory checkpoint file '%s'\n", 497 filename); 498 } 499 500 if (gzclose(compressedMem)) 501 fatal("Close failed on physical memory checkpoint file '%s'\n", 502 filename); 503} 504 505void 506PhysicalMemory::unserialize(Checkpoint *cp, const string §ion) 507{ 508 if (!pmemAddr) 509 return; 510 511 gzFile compressedMem; 512 long *tempPage; 513 long *pmem_current; 514 uint64_t curSize; 515 uint32_t bytesRead; 516 const uint32_t chunkSize = 16384; 517 518 string filename; 519 520 UNSERIALIZE_SCALAR(filename); 521 522 filename = cp->cptDir + "/" + filename; 523 524 // mmap memoryfile 525 int fd = open(filename.c_str(), O_RDONLY); 526 if (fd < 0) { 527 perror("open"); 528 fatal("Can't open physical memory checkpoint file '%s'", filename); 529 } 530 531 compressedMem = gzdopen(fd, "rb"); 532 if (compressedMem == NULL) 533 fatal("Insufficient memory to allocate compression state for %s\n", 534 filename); 535 536 // unmap file that was mmaped in the constructor 537 // This is done here to make sure that gzip and open don't muck with our 538 // nice large space of memory before we reallocate it 539 munmap((char*)pmemAddr, size()); 540 541 UNSERIALIZE_SCALAR(_size); 542 if (size() > params()->range.size()) 543 fatal("Memory size has changed!\n"); 544 545 pmemAddr = (uint8_t *)mmap(NULL, size(), 546 PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0); 547 548 if (pmemAddr == (void *)MAP_FAILED) { 549 perror("mmap"); 550 fatal("Could not mmap physical memory!\n"); 551 } 552 553 curSize = 0; 554 tempPage = (long*)malloc(chunkSize); 555 if (tempPage == NULL) 556 fatal("Unable to malloc memory to read file %s\n", filename); 557 558 /* Only copy bytes that are non-zero, so we don't give the VM system hell */ 559 while (curSize < size()) { 560 bytesRead = gzread(compressedMem, tempPage, chunkSize); 561 if (bytesRead == 0) 562 break; 563 564 assert(bytesRead % sizeof(long) == 0); 565 566 for (uint32_t x = 0; x < bytesRead / sizeof(long); x++) 567 { 568 if (*(tempPage+x) != 0) { 569 pmem_current = (long*)(pmemAddr + curSize + x * sizeof(long)); 570 *pmem_current = *(tempPage+x); 571 } 572 } 573 curSize += bytesRead; 574 } 575 576 free(tempPage); 577 578 if (gzclose(compressedMem)) 579 fatal("Close failed on physical memory checkpoint file '%s'\n", 580 filename); 581 582} 583 584PhysicalMemory * 585PhysicalMemoryParams::create() 586{ 587 return new PhysicalMemory(this); 588} 589