system.cc revision 9538:182d67b5b57a
1/* 2 * Copyright (c) 2010-2012 ARM Limited 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) 2002-2006 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: Ali Saidi 41 */ 42 43#include "arch/arm/linux/atag.hh" 44#include "arch/arm/linux/system.hh" 45#include "arch/arm/isa_traits.hh" 46#include "arch/arm/utility.hh" 47#include "arch/generic/linux/threadinfo.hh" 48#include "base/loader/dtb_object.hh" 49#include "base/loader/object_file.hh" 50#include "base/loader/symtab.hh" 51#include "cpu/base.hh" 52#include "cpu/pc_event.hh" 53#include "cpu/thread_context.hh" 54#include "debug/Loader.hh" 55#include "kern/linux/events.hh" 56#include "mem/fs_translating_port_proxy.hh" 57#include "mem/physical.hh" 58#include "sim/stat_control.hh" 59 60using namespace ArmISA; 61using namespace Linux; 62 63LinuxArmSystem::LinuxArmSystem(Params *p) 64 : ArmSystem(p), 65 enableContextSwitchStatsDump(p->enable_context_switch_stats_dump) 66{ 67#ifndef NDEBUG 68 kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic"); 69 if (!kernelPanicEvent) 70 panic("could not find kernel symbol \'panic\'"); 71#endif 72 73 // With ARM udelay() is #defined to __udelay 74 Addr addr = 0; 75 if (kernelSymtab->findAddress("__udelay", addr)) { 76 uDelaySkipEvent = new UDelayEvent(&pcEventQueue, "__udelay", 77 fixFuncEventAddr(addr), 1000, 0); 78 } else { 79 panic("couldn't find kernel symbol \'udelay\'"); 80 } 81 82 // constant arguments to udelay() have some precomputation done ahead of 83 // time. Constant comes from code. 84 if (kernelSymtab->findAddress("__const_udelay", addr)) { 85 constUDelaySkipEvent = new UDelayEvent(&pcEventQueue, "__const_udelay", 86 fixFuncEventAddr(addr), 1000, 107374); 87 } else { 88 panic("couldn't find kernel symbol \'udelay\'"); 89 } 90 91 secDataPtrAddr = 0; 92 secDataAddr = 0; 93 penReleaseAddr = 0; 94 kernelSymtab->findAddress("__secondary_data", secDataPtrAddr); 95 kernelSymtab->findAddress("secondary_data", secDataAddr); 96 kernelSymtab->findAddress("pen_release", penReleaseAddr); 97 98 secDataPtrAddr &= ~ULL(0x7F); 99 secDataAddr &= ~ULL(0x7F); 100 penReleaseAddr &= ~ULL(0x7F); 101} 102 103bool 104LinuxArmSystem::adderBootUncacheable(Addr a) 105{ 106 Addr block = a & ~ULL(0x7F); 107 if (block == secDataPtrAddr || block == secDataAddr || 108 block == penReleaseAddr) 109 return true; 110 return false; 111} 112 113void 114LinuxArmSystem::initState() 115{ 116 // Moved from the constructor to here since it relies on the 117 // address map being resolved in the interconnect 118 119 // Call the initialisation of the super class 120 ArmSystem::initState(); 121 122 // Load symbols at physical address, we might not want 123 // to do this permanently, for but early bootup work 124 // it is helpful. 125 if (params()->early_kernel_symbols) { 126 kernel->loadGlobalSymbols(kernelSymtab, loadAddrMask); 127 kernel->loadGlobalSymbols(debugSymbolTable, loadAddrMask); 128 } 129 130 // Setup boot data structure 131 Addr addr = 0; 132 // Check if the kernel image has a symbol that tells us it supports 133 // device trees. 134 bool kernel_has_fdt_support = 135 kernelSymtab->findAddress("unflatten_device_tree", addr); 136 bool dtb_file_specified = params()->dtb_filename != ""; 137 138 if (kernel_has_fdt_support && dtb_file_specified) { 139 // Kernel supports flattened device tree and dtb file specified. 140 // Using Device Tree Blob to describe system configuration. 141 inform("Loading DTB file: %s\n", params()->dtb_filename); 142 143 ObjectFile *dtb_file = createObjectFile(params()->dtb_filename, true); 144 if (!dtb_file) { 145 fatal("couldn't load DTB file: %s\n", params()->dtb_filename); 146 } 147 148 DtbObject *_dtb_file = dynamic_cast<DtbObject*>(dtb_file); 149 150 if (_dtb_file) { 151 if (!_dtb_file->addBootCmdLine(params()->boot_osflags.c_str(), 152 params()->boot_osflags.size())) { 153 warn("couldn't append bootargs to DTB file: %s\n", 154 params()->dtb_filename); 155 } 156 } else { 157 warn("dtb_file cast failed; couldn't append bootargs " 158 "to DTB file: %s\n", params()->dtb_filename); 159 } 160 161 dtb_file->setTextBase(params()->atags_addr); 162 dtb_file->loadSections(physProxy); 163 delete dtb_file; 164 } else { 165 // Using ATAGS 166 // Warn if the kernel supports FDT and we haven't specified one 167 if (kernel_has_fdt_support) { 168 assert(!dtb_file_specified); 169 warn("Kernel supports device tree, but no DTB file specified\n"); 170 } 171 // Warn if the kernel doesn't support FDT and we have specified one 172 if (dtb_file_specified) { 173 assert(!kernel_has_fdt_support); 174 warn("DTB file specified, but no device tree support in kernel\n"); 175 } 176 177 AtagCore ac; 178 ac.flags(1); // read-only 179 ac.pagesize(8192); 180 ac.rootdev(0); 181 182 AddrRangeList atagRanges = physmem.getConfAddrRanges(); 183 if (atagRanges.size() != 1) { 184 fatal("Expected a single ATAG memory entry but got %d\n", 185 atagRanges.size()); 186 } 187 AtagMem am; 188 am.memSize(atagRanges.begin()->size()); 189 am.memStart(atagRanges.begin()->start()); 190 191 AtagCmdline ad; 192 ad.cmdline(params()->boot_osflags); 193 194 DPRINTF(Loader, "boot command line %d bytes: %s\n", 195 ad.size() <<2, params()->boot_osflags.c_str()); 196 197 AtagNone an; 198 199 uint32_t size = ac.size() + am.size() + ad.size() + an.size(); 200 uint32_t offset = 0; 201 uint8_t *boot_data = new uint8_t[size << 2]; 202 203 offset += ac.copyOut(boot_data + offset); 204 offset += am.copyOut(boot_data + offset); 205 offset += ad.copyOut(boot_data + offset); 206 offset += an.copyOut(boot_data + offset); 207 208 DPRINTF(Loader, "Boot atags was %d bytes in total\n", size << 2); 209 DDUMP(Loader, boot_data, size << 2); 210 211 physProxy.writeBlob(params()->atags_addr, boot_data, size << 2); 212 213 delete[] boot_data; 214 } 215 216 for (int i = 0; i < threadContexts.size(); i++) { 217 threadContexts[i]->setIntReg(0, 0); 218 threadContexts[i]->setIntReg(1, params()->machine_type); 219 threadContexts[i]->setIntReg(2, params()->atags_addr); 220 } 221} 222 223LinuxArmSystem::~LinuxArmSystem() 224{ 225 if (uDelaySkipEvent) 226 delete uDelaySkipEvent; 227 if (constUDelaySkipEvent) 228 delete constUDelaySkipEvent; 229 230 if (dumpStatsPCEvent) 231 delete dumpStatsPCEvent; 232} 233 234LinuxArmSystem * 235LinuxArmSystemParams::create() 236{ 237 return new LinuxArmSystem(this); 238} 239 240void 241LinuxArmSystem::startup() 242{ 243 if (enableContextSwitchStatsDump) { 244 dumpStatsPCEvent = addKernelFuncEvent<DumpStatsPCEvent>("__switch_to"); 245 if (!dumpStatsPCEvent) 246 panic("dumpStatsPCEvent not created!"); 247 248 std::string task_filename = "tasks.txt"; 249 taskFile = simout.create(name() + "." + task_filename); 250 251 for (int i = 0; i < _numContexts; i++) { 252 ThreadContext *tc = threadContexts[i]; 253 uint32_t pid = tc->getCpuPtr()->getPid(); 254 if (pid != Request::invldPid) { 255 mapPid(tc, pid); 256 tc->getCpuPtr()->taskId(taskMap[pid]); 257 } 258 } 259 } 260} 261 262void 263LinuxArmSystem::mapPid(ThreadContext *tc, uint32_t pid) 264{ 265 // Create a new unique identifier for this pid 266 std::map<uint32_t, uint32_t>::iterator itr = taskMap.find(pid); 267 if (itr == taskMap.end()) { 268 uint32_t map_size = taskMap.size(); 269 if (map_size > ContextSwitchTaskId::MaxNormalTaskId + 1) { 270 warn_once("Error out of identifiers for cache occupancy stats"); 271 taskMap[pid] = ContextSwitchTaskId::Unknown; 272 } else { 273 taskMap[pid] = map_size; 274 } 275 } 276} 277 278/** This function is called whenever the the kernel function 279 * "__switch_to" is called to change running tasks. 280 * 281 * r0 = task_struct of the previously running process 282 * r1 = task_info of the previously running process 283 * r2 = task_info of the next process to run 284 */ 285void 286DumpStatsPCEvent::process(ThreadContext *tc) 287{ 288 Linux::ThreadInfo ti(tc); 289 Addr task_descriptor = tc->readIntReg(2); 290 uint32_t pid = ti.curTaskPID(task_descriptor); 291 uint32_t tgid = ti.curTaskTGID(task_descriptor); 292 std::string next_task_str = ti.curTaskName(task_descriptor); 293 294 // Streamline treats pid == -1 as the kernel process. 295 // Also pid == 0 implies idle process (except during Linux boot) 296 int32_t mm = ti.curTaskMm(task_descriptor); 297 bool is_kernel = (mm == 0); 298 if (is_kernel && (pid != 0)) { 299 pid = -1; 300 tgid = -1; 301 next_task_str = "kernel"; 302 } 303 304 LinuxArmSystem* sys = dynamic_cast<LinuxArmSystem *>(tc->getSystemPtr()); 305 if (!sys) { 306 panic("System is not LinuxArmSystem while getting Linux process info!"); 307 } 308 std::map<uint32_t, uint32_t>& taskMap = sys->taskMap; 309 310 // Create a new unique identifier for this pid 311 sys->mapPid(tc, pid); 312 313 // Set cpu task id, output process info, and dump stats 314 tc->getCpuPtr()->taskId(taskMap[pid]); 315 tc->getCpuPtr()->setPid(pid); 316 317 std::ostream* taskFile = sys->taskFile; 318 319 // Task file is read by cache occupancy plotting script or 320 // Streamline conversion script. 321 ccprintf(*taskFile, 322 "tick=%lld %d cpu_id=%d next_pid=%d next_tgid=%d next_task=%s\n", 323 curTick(), taskMap[pid], tc->cpuId(), (int) pid, (int) tgid, 324 next_task_str); 325 taskFile->flush(); 326 327 // Dump and reset statistics 328 Stats::schedStatEvent(true, true, curTick(), 0); 329} 330 331