Pablo Tello | eb82fd2 | 2018-02-23 13:43:50 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2018 ARM Limited. |
| 3 | * |
| 4 | * SPDX-License-Identifier: MIT |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to |
| 8 | * deal in the Software without restriction, including without limitation the |
| 9 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| 10 | * sell copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all |
| 14 | * copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 19 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 22 | * SOFTWARE. |
| 23 | */ |
| 24 | |
| 25 | #pragma once |
| 26 | |
| 27 | #include <fcntl.h> |
| 28 | #include <sched.h> |
| 29 | #include <stdio.h> |
| 30 | #include <stdlib.h> |
| 31 | #include <string.h> |
| 32 | #include <unistd.h> |
| 33 | #include <sys/types.h> |
| 34 | #include <sys/stat.h> |
| 35 | |
| 36 | #include <fstream> |
| 37 | #include <iostream> |
| 38 | #include <regex> |
| 39 | #include <sstream> |
| 40 | #include <thread> |
| 41 | |
| 42 | extern int l1_cache_size; |
| 43 | extern int l2_cache_size; |
| 44 | extern int force_cpu; |
| 45 | |
| 46 | #ifdef __ANDROID__ |
| 47 | inline unsigned long stoul( const std::string& str, std::size_t* pos = 0, int base = 10 ) |
| 48 | { |
| 49 | char *end; |
| 50 | const unsigned long ret = strtoul( str.c_str(), &end, base); |
| 51 | *pos = end - str.c_str(); |
| 52 | return ret; |
| 53 | } |
| 54 | inline int stoi( const std::string& str, std::size_t* pos = 0, int base = 10 ) |
| 55 | { |
| 56 | return atoi(str.c_str()); |
| 57 | } |
| 58 | #endif |
| 59 | |
| 60 | |
| 61 | #ifndef BARE_METAL |
| 62 | #include <sys/auxv.h> |
| 63 | |
| 64 | /* Get HWCAP bits from asm/hwcap.h */ |
| 65 | #include <asm/hwcap.h> |
| 66 | #endif /* !BARE_METAL */ |
| 67 | |
| 68 | /* Make sure the bits we care about are defined, just in case asm/hwcap.h is |
| 69 | * out of date (or for bare metal mode) */ |
| 70 | #ifndef HWCAP_ASIMDHP |
| 71 | #define HWCAP_ASIMDHP (1 << 10) |
| 72 | #endif |
| 73 | |
| 74 | #ifndef HWCAP_CPUID |
| 75 | #define HWCAP_CPUID (1 << 11) |
| 76 | #endif |
| 77 | |
| 78 | #ifndef HWCAP_ASIMDDP |
| 79 | #define HWCAP_ASIMDDP (1 << 20) |
| 80 | #endif |
| 81 | |
| 82 | #define CPUINFO_HACK |
| 83 | |
| 84 | //unsigned int get_cpu_impl(); |
| 85 | |
| 86 | |
| 87 | /* CPU models - we only need to detect CPUs we have |
| 88 | * microarchitecture-specific code for. |
| 89 | * |
| 90 | * Architecture features are detected via HWCAPs. |
| 91 | */ |
| 92 | enum class CPUModel { |
| 93 | GENERIC = 0x0001, |
| 94 | A53 = 0x0010, |
| 95 | A55r0 = 0x0011, |
| 96 | A55r1 = 0x0012, |
| 97 | }; |
| 98 | |
| 99 | class CPUInfo |
| 100 | { |
| 101 | private: |
| 102 | struct PerCPUData { |
| 103 | CPUModel model = CPUModel::GENERIC; |
| 104 | uint32_t midr = 0; |
| 105 | bool model_set = false; |
| 106 | }; |
| 107 | |
| 108 | std::vector<PerCPUData> _percpu={}; |
| 109 | |
| 110 | bool _cpuid = false; |
| 111 | bool _fp16 = false; |
| 112 | bool _dotprod = false; |
| 113 | |
| 114 | unsigned int L1_cache_size = 32768; |
| 115 | unsigned int L2_cache_size = 262144; |
| 116 | |
| 117 | /* Convert an MIDR register value to a CPUModel enum value. */ |
| 118 | CPUModel midr_to_model(const unsigned int midr) const { |
| 119 | CPUModel model; |
| 120 | |
| 121 | // Unpack variant and CPU ID |
| 122 | int variant = (midr >> 20) & 0xF; |
| 123 | int cpunum = (midr >> 4) & 0xFFF; |
| 124 | |
| 125 | /* Only CPUs we have code paths for are detected. All other CPUs |
| 126 | * can be safely classed as "GENERIC" |
| 127 | */ |
| 128 | |
| 129 | switch(cpunum) { |
| 130 | case 0xd03: |
| 131 | model = CPUModel::A53; |
| 132 | break; |
| 133 | |
| 134 | case 0xd05: |
| 135 | if (variant) { |
| 136 | model = CPUModel::A55r1; |
| 137 | } else { |
| 138 | model = CPUModel::A55r0; |
| 139 | } |
| 140 | break; |
| 141 | |
| 142 | default: |
| 143 | model = CPUModel::GENERIC; |
| 144 | break; |
| 145 | } |
| 146 | |
| 147 | return model; |
| 148 | } |
| 149 | |
| 150 | /* If the CPUID capability is present, MIDR information is provided in |
| 151 | /sys. Use that to populate the CPU model table. */ |
| 152 | void populate_models_cpuid() { |
| 153 | for (unsigned long int i=0; i<_percpu.size(); i++) { |
| 154 | std::stringstream str; |
| 155 | str << "/sys/devices/system/cpu/cpu" << i << "/regs/identification/midr_el1"; |
| 156 | std::ifstream file; |
| 157 | |
| 158 | file.open(str.str(), std::ios::in); |
| 159 | |
| 160 | if (file.is_open()) { |
| 161 | std::string line; |
| 162 | |
| 163 | if (bool(getline(file, line))) { |
| 164 | const unsigned long midr = stoul(line, nullptr, 16); |
| 165 | |
| 166 | _percpu[i].midr = (midr & 0xffffffff); |
| 167 | _percpu[i].model = midr_to_model(_percpu[i].midr); |
| 168 | _percpu[i].model_set = true; |
| 169 | } |
| 170 | } |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | /* If "long-form" cpuinfo is present, parse that to populate models. */ |
| 175 | void populate_models_cpuinfo() { |
| 176 | std::regex proc_regex("^processor.*(\\d+)$"); |
| 177 | std::regex imp_regex("^CPU implementer.*0x(..)$"); |
| 178 | std::regex var_regex("^CPU variant.*0x(.)$"); |
| 179 | std::regex part_regex("^CPU part.*0x(...)$"); |
| 180 | std::regex rev_regex("^CPU revision.*(\\d+)$"); |
| 181 | |
| 182 | std::ifstream file; |
| 183 | file.open("/proc/cpuinfo", std::ios::in); |
| 184 | |
| 185 | if (file.is_open()) { |
| 186 | std::string line; |
| 187 | int midr=0; |
| 188 | int curcpu=-1; |
| 189 | |
| 190 | while(bool(getline(file, line))) { |
| 191 | std::smatch match; |
| 192 | |
| 193 | if (std::regex_match(line, match, proc_regex)) { |
| 194 | std::string id = match[1]; |
| 195 | int newcpu=stoi(id, nullptr, 0); |
| 196 | |
| 197 | if (curcpu >= 0 && midr==0) { |
| 198 | // Matched a new CPU ID without any description of the previous one - looks like old format. |
| 199 | return; |
| 200 | } |
| 201 | |
| 202 | if (curcpu >= 0) { |
| 203 | _percpu[curcpu].midr = midr; |
| 204 | _percpu[curcpu].model = midr_to_model(midr); |
| 205 | _percpu[curcpu].model_set = true; |
| 206 | |
| 207 | printf("CPU %d: %x\n",curcpu,midr); |
| 208 | } |
| 209 | |
| 210 | midr=0; |
| 211 | curcpu=newcpu; |
| 212 | |
| 213 | continue; |
| 214 | } |
| 215 | |
| 216 | if (std::regex_match(line, match, imp_regex)) { |
| 217 | int impv = stoi(match[1], nullptr, 16); |
| 218 | midr |= (impv << 24); |
| 219 | continue; |
| 220 | } |
| 221 | |
| 222 | if (std::regex_match(line, match, var_regex)) { |
| 223 | int varv = stoi(match[1], nullptr, 16); |
| 224 | midr |= (varv << 16); |
| 225 | continue; |
| 226 | } |
| 227 | |
| 228 | if (std::regex_match(line, match, part_regex)) { |
| 229 | int partv = stoi(match[1], nullptr, 16); |
| 230 | midr |= (partv << 4); |
| 231 | continue; |
| 232 | } |
| 233 | |
| 234 | if (std::regex_match(line, match, rev_regex)) { |
| 235 | int regv = stoi(match[1], nullptr, 10); |
| 236 | midr |= (regv); |
| 237 | midr |= (0xf << 16); |
| 238 | continue; |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | if (curcpu >= 0) { |
| 243 | _percpu[curcpu].midr = midr; |
| 244 | _percpu[curcpu].model = midr_to_model(midr); |
| 245 | _percpu[curcpu].model_set = true; |
| 246 | |
| 247 | printf("CPU %d: %x\n",curcpu,midr); |
| 248 | } |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | /* Identify the maximum valid CPUID in the system. This reads |
| 253 | * /sys/devices/system/cpu/present to get the information. */ |
| 254 | int get_max_cpus() { |
| 255 | int max_cpus = 1; |
| 256 | |
| 257 | #ifndef BARE_METAL |
| 258 | std::ifstream CPUspresent; |
| 259 | CPUspresent.open("/sys/devices/system/cpu/present", std::ios::in); |
| 260 | bool success = false; |
| 261 | |
| 262 | if (CPUspresent.is_open()) { |
| 263 | std::string line; |
| 264 | |
| 265 | if (bool(getline(CPUspresent, line))) { |
| 266 | /* The content of this file is a list of ranges or single values, e.g. |
| 267 | * 0-5, or 1-3,5,7 or similar. As we are interested in the |
| 268 | * max valid ID, we just need to find the last valid |
| 269 | * delimiter ('-' or ',') and parse the integer immediately after that. |
| 270 | */ |
| 271 | auto startfrom=line.begin(); |
| 272 | |
| 273 | for (auto i=line.begin(); i<line.end(); ++i) { |
| 274 | if (*i=='-' || *i==',') { |
| 275 | startfrom=i+1; |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | line.erase(line.begin(), startfrom); |
| 280 | |
| 281 | max_cpus = stoi(line, nullptr, 0) + 1; |
| 282 | success = true; |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | // Return std::thread::hardware_concurrency() as a fallback. |
| 287 | if (!success) { |
| 288 | max_cpus = std::thread::hardware_concurrency(); |
| 289 | } |
| 290 | #endif // !BARE_METAL |
| 291 | |
| 292 | return max_cpus; |
| 293 | } |
| 294 | |
| 295 | public: |
| 296 | CPUInfo() { |
| 297 | #ifndef BARE_METAL |
| 298 | unsigned long hwcaps = getauxval(AT_HWCAP); |
| 299 | |
| 300 | if (hwcaps & HWCAP_CPUID) { |
| 301 | _cpuid = true; |
| 302 | } |
| 303 | |
| 304 | if (hwcaps & HWCAP_ASIMDHP) { |
| 305 | _fp16 = true; |
| 306 | } |
| 307 | |
| 308 | if (hwcaps & HWCAP_ASIMDDP) { |
| 309 | _dotprod = true; |
| 310 | } |
| 311 | |
| 312 | #ifdef __aarch64__ |
| 313 | /* Pre-4.15 kernels don't have the ASIMDDP bit. |
| 314 | * |
| 315 | * Although the CPUID bit allows us to read the feature register |
| 316 | * directly, the kernel quite sensibly masks this to only show |
| 317 | * features known by it to be safe to show to userspace. As a |
| 318 | * result, pre-4.15 kernels won't show the relevant bit in the |
| 319 | * feature registers either. |
| 320 | * |
| 321 | * So for now, use a whitelist of CPUs known to support the feature. |
| 322 | */ |
| 323 | if (!_dotprod && _cpuid) { |
| 324 | /* List of CPUs with dot product support: A55r1 A75r1 A75r2 */ |
| 325 | const unsigned int dotprod_whitelist_masks[] = { 0xfff0fff0, 0xfff0fff0, 0xfff0fff0, 0 }; |
| 326 | const unsigned int dotprod_whitelist_values[] = { 0x4110d050, 0x4110d0a0, 0x4120d0a0, 0 }; |
| 327 | |
| 328 | unsigned long cpuid; |
| 329 | |
| 330 | __asm __volatile ( |
| 331 | "mrs %0, midr_el1\n" |
| 332 | : "=r" (cpuid) |
| 333 | : |
| 334 | : |
| 335 | ); |
| 336 | |
| 337 | for (int i=0;dotprod_whitelist_values[i];i++) { |
| 338 | if ((cpuid & dotprod_whitelist_masks[i]) == dotprod_whitelist_values[i]) { |
| 339 | _dotprod = true; |
| 340 | break; |
| 341 | } |
| 342 | } |
| 343 | } |
| 344 | #endif |
| 345 | _percpu.resize(get_max_cpus()); |
| 346 | #endif |
| 347 | if (_cpuid) { |
| 348 | populate_models_cpuid(); |
| 349 | } else { |
| 350 | populate_models_cpuinfo(); |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | void set_fp16(const bool fp16) { |
| 355 | _fp16 = fp16; |
| 356 | } |
| 357 | |
| 358 | void set_dotprod(const bool dotprod) { |
| 359 | _dotprod = dotprod; |
| 360 | } |
| 361 | |
| 362 | void set_cpu_model(unsigned long cpuid, CPUModel model) { |
| 363 | if (_percpu.size() > cpuid) { |
| 364 | _percpu[cpuid].model = model; |
| 365 | _percpu[cpuid].model_set = true; |
| 366 | } |
| 367 | } |
| 368 | |
| 369 | bool has_fp16() const { |
| 370 | return _fp16; |
| 371 | } |
| 372 | |
| 373 | bool has_dotprod() const { |
| 374 | return _dotprod; |
| 375 | } |
| 376 | |
| 377 | CPUModel get_cpu_model(unsigned long cpuid) const { |
| 378 | if (cpuid < _percpu.size()) { |
| 379 | return _percpu[cpuid].model; |
| 380 | } |
| 381 | |
| 382 | return CPUModel::GENERIC; |
| 383 | } |
| 384 | |
| 385 | CPUModel get_cpu_model() const { |
| 386 | #ifdef BARE_METAL |
| 387 | return get_cpu_model(0); |
| 388 | #else |
| 389 | return get_cpu_model(sched_getcpu()); |
| 390 | #endif |
| 391 | } |
| 392 | |
| 393 | unsigned int get_L1_cache_size() const { |
| 394 | return L1_cache_size; |
| 395 | } |
| 396 | |
| 397 | void set_L1_cache_size(unsigned int size) { |
| 398 | L1_cache_size = size; |
| 399 | } |
| 400 | |
| 401 | unsigned int get_L2_cache_size() const { |
| 402 | return L2_cache_size; |
| 403 | } |
| 404 | |
| 405 | void set_L2_cache_size(unsigned int size) { |
| 406 | L2_cache_size = size; |
| 407 | } |
| 408 | }; |
| 409 | |
| 410 | CPUInfo *get_CPUInfo(); |