Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 1 | /* |
Pablo Marquez Tello | 67c3c63 | 2023-01-23 17:00:41 +0000 | [diff] [blame] | 2 | * Copyright (c) 2021-2023 Arm Limited. |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 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 | #include "src/common/cpuinfo/CpuInfo.h" |
| 25 | |
| 26 | #include "arm_compute/core/Error.h" |
| 27 | #include "arm_compute/core/Log.h" |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 28 | #include "support/StringSupport.h" |
| 29 | #include "support/ToolchainSupport.h" |
| 30 | |
| 31 | #include <sstream> |
| 32 | |
| 33 | #if !defined(BARE_METAL) |
| 34 | #include <algorithm> |
| 35 | #include <cstring> |
| 36 | #include <fstream> |
Pablo Tello | 4e66d70 | 2022-03-07 18:20:12 +0000 | [diff] [blame] | 37 | #if !defined(_WIN64) |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 38 | #include <regex.h> /* C++ std::regex takes up a lot of space in the standalone builds */ |
| 39 | #include <sched.h> |
Pablo Tello | 4e66d70 | 2022-03-07 18:20:12 +0000 | [diff] [blame] | 40 | #endif /* !defined(_WIN64) */ |
| 41 | |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 42 | #include <thread> |
| 43 | #include <unordered_map> |
| 44 | #endif /* !defined(BARE_METAL) */ |
| 45 | |
Pablo Tello | 4e66d70 | 2022-03-07 18:20:12 +0000 | [diff] [blame] | 46 | #if !defined(_WIN64) |
Kevin Lo | 7195f71 | 2022-01-07 15:46:02 +0800 | [diff] [blame] | 47 | #if !defined(BARE_METAL) && !defined(__APPLE__) && !defined(__OpenBSD__) && (defined(__arm__) || defined(__aarch64__)) |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 48 | #include <asm/hwcap.h> /* Get HWCAP bits from asm/hwcap.h */ |
| 49 | #include <sys/auxv.h> |
Pablo Marquez Tello | 639f0f6 | 2022-01-21 15:25:27 +0000 | [diff] [blame] | 50 | #elif defined(__APPLE__) && defined(__aarch64__) |
| 51 | #include <sys/sysctl.h> |
| 52 | #include <sys/types.h> |
Pablo Tello | 4e66d70 | 2022-03-07 18:20:12 +0000 | [diff] [blame] | 53 | #endif /* defined(__APPLE__) && defined(__aarch64__)) */ |
Kevin Lo | 7195f71 | 2022-01-07 15:46:02 +0800 | [diff] [blame] | 54 | #endif /* !defined(BARE_METAL) && !defined(__APPLE__) && !defined(__OpenBSD__) && (defined(__arm__) || defined(__aarch64__)) */ |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 55 | |
| 56 | #define ARM_COMPUTE_CPU_FEATURE_HWCAP_CPUID (1 << 11) |
| 57 | #define ARM_COMPUTE_GET_FEATURE_REG(var, freg) __asm __volatile("MRS %0, " #freg \ |
| 58 | : "=r"(var)) |
| 59 | namespace arm_compute |
| 60 | { |
| 61 | namespace cpuinfo |
| 62 | { |
| 63 | namespace |
| 64 | { |
Pablo Tello | 4e66d70 | 2022-03-07 18:20:12 +0000 | [diff] [blame] | 65 | #if !defined(_WIN64) && !defined(BARE_METAL) && !defined(__APPLE__) && !defined(__OpenBSD__) && (defined(__arm__) || defined(__aarch64__)) |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 66 | /** Extract MIDR using CPUID information that are exposed to user-space |
| 67 | * |
| 68 | * @param[in] max_num_cpus Maximum number of possible CPUs |
| 69 | * |
| 70 | * @return std::vector<uint32_t> A list of the MIDR of each core |
| 71 | */ |
| 72 | std::vector<uint32_t> midr_from_cpuid(uint32_t max_num_cpus) |
| 73 | { |
| 74 | std::vector<uint32_t> cpus; |
| 75 | for(unsigned int i = 0; i < max_num_cpus; ++i) |
| 76 | { |
| 77 | std::stringstream str; |
| 78 | str << "/sys/devices/system/cpu/cpu" << i << "/regs/identification/midr_el1"; |
| 79 | std::ifstream file(str.str(), std::ios::in); |
| 80 | if(file.is_open()) |
| 81 | { |
| 82 | std::string line; |
| 83 | if(bool(getline(file, line))) |
| 84 | { |
| 85 | cpus.emplace_back(support::cpp11::stoul(line, nullptr, support::cpp11::NumericBase::BASE_16)); |
| 86 | } |
| 87 | } |
| 88 | } |
| 89 | return cpus; |
| 90 | } |
| 91 | |
| 92 | /** Extract MIDR by parsing the /proc/cpuinfo meta-data |
| 93 | * |
| 94 | * @param[in] max_num_cpus Maximum number of possible CPUs |
| 95 | * |
| 96 | * @return std::vector<uint32_t> A list of the MIDR of each core |
| 97 | */ |
| 98 | std::vector<uint32_t> midr_from_proc_cpuinfo(int max_num_cpus) |
| 99 | { |
| 100 | std::vector<uint32_t> cpus; |
| 101 | |
| 102 | regex_t proc_regex; |
| 103 | regex_t imp_regex; |
| 104 | regex_t var_regex; |
| 105 | regex_t part_regex; |
| 106 | regex_t rev_regex; |
| 107 | |
| 108 | memset(&proc_regex, 0, sizeof(regex_t)); |
| 109 | memset(&imp_regex, 0, sizeof(regex_t)); |
| 110 | memset(&var_regex, 0, sizeof(regex_t)); |
| 111 | memset(&part_regex, 0, sizeof(regex_t)); |
| 112 | memset(&rev_regex, 0, sizeof(regex_t)); |
| 113 | |
| 114 | int ret_status = 0; |
| 115 | // If "long-form" cpuinfo is present, parse that to populate models. |
| 116 | ret_status |= regcomp(&proc_regex, R"(^processor.*([[:digit:]]+)$)", REG_EXTENDED); |
| 117 | ret_status |= regcomp(&imp_regex, R"(^CPU implementer.*0x(..)$)", REG_EXTENDED); |
| 118 | ret_status |= regcomp(&var_regex, R"(^CPU variant.*0x(.)$)", REG_EXTENDED); |
| 119 | ret_status |= regcomp(&part_regex, R"(^CPU part.*0x(...)$)", REG_EXTENDED); |
| 120 | ret_status |= regcomp(&rev_regex, R"(^CPU revision.*([[:digit:]]+)$)", REG_EXTENDED); |
| 121 | ARM_COMPUTE_UNUSED(ret_status); |
| 122 | ARM_COMPUTE_ERROR_ON_MSG(ret_status != 0, "Regex compilation failed."); |
| 123 | |
| 124 | std::ifstream file("/proc/cpuinfo", std::ios::in); |
| 125 | if(file.is_open()) |
| 126 | { |
| 127 | std::string line; |
| 128 | int midr = 0; |
| 129 | int curcpu = -1; |
| 130 | |
| 131 | while(bool(getline(file, line))) |
| 132 | { |
| 133 | std::array<regmatch_t, 2> match; |
| 134 | ret_status = regexec(&proc_regex, line.c_str(), 2, match.data(), 0); |
| 135 | if(ret_status == 0) |
| 136 | { |
| 137 | std::string id = line.substr(match[1].rm_so, (match[1].rm_eo - match[1].rm_so)); |
| 138 | int newcpu = support::cpp11::stoi(id, nullptr); |
| 139 | |
| 140 | if(curcpu >= 0 && midr == 0) |
| 141 | { |
| 142 | // Matched a new CPU ID without any description of the previous one - looks like old format. |
| 143 | return {}; |
| 144 | } |
| 145 | |
| 146 | if(curcpu >= 0 && curcpu < max_num_cpus) |
| 147 | { |
| 148 | cpus.emplace_back(midr); |
| 149 | } |
| 150 | else |
| 151 | { |
| 152 | ARM_COMPUTE_LOG_INFO_MSG_CORE("Trying to populate a core id with id greater than the expected number of cores!"); |
| 153 | } |
| 154 | |
| 155 | midr = 0; |
| 156 | curcpu = newcpu; |
| 157 | |
| 158 | continue; |
| 159 | } |
| 160 | |
| 161 | ret_status = regexec(&imp_regex, line.c_str(), 2, match.data(), 0); |
| 162 | if(ret_status == 0) |
| 163 | { |
| 164 | std::string subexp = line.substr(match[1].rm_so, (match[1].rm_eo - match[1].rm_so)); |
| 165 | int impv = support::cpp11::stoi(subexp, nullptr, support::cpp11::NumericBase::BASE_16); |
| 166 | midr |= (impv << 24); |
| 167 | |
| 168 | continue; |
| 169 | } |
| 170 | |
| 171 | ret_status = regexec(&var_regex, line.c_str(), 2, match.data(), 0); |
| 172 | if(ret_status == 0) |
| 173 | { |
| 174 | std::string subexp = line.substr(match[1].rm_so, (match[1].rm_eo - match[1].rm_so)); |
| 175 | int varv = support::cpp11::stoi(subexp, nullptr, support::cpp11::NumericBase::BASE_16); |
| 176 | midr |= (varv << 20); |
| 177 | |
| 178 | continue; |
| 179 | } |
| 180 | |
| 181 | ret_status = regexec(&part_regex, line.c_str(), 2, match.data(), 0); |
| 182 | if(ret_status == 0) |
| 183 | { |
| 184 | std::string subexp = line.substr(match[1].rm_so, (match[1].rm_eo - match[1].rm_so)); |
| 185 | int partv = support::cpp11::stoi(subexp, nullptr, support::cpp11::NumericBase::BASE_16); |
| 186 | midr |= (partv << 4); |
| 187 | |
| 188 | continue; |
| 189 | } |
| 190 | |
| 191 | ret_status = regexec(&rev_regex, line.c_str(), 2, match.data(), 0); |
| 192 | if(ret_status == 0) |
| 193 | { |
| 194 | std::string subexp = line.substr(match[1].rm_so, (match[1].rm_eo - match[1].rm_so)); |
| 195 | int regv = support::cpp11::stoi(subexp, nullptr); |
| 196 | midr |= (regv); |
| 197 | midr |= (0xf << 16); |
| 198 | |
| 199 | continue; |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | if(curcpu >= 0 && curcpu < max_num_cpus) |
| 204 | { |
| 205 | cpus.emplace_back(midr); |
| 206 | } |
| 207 | else |
| 208 | { |
| 209 | ARM_COMPUTE_LOG_INFO_MSG_CORE("Trying to populate a core id with id greater than the expected number of cores!"); |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | // Free allocated memory |
| 214 | regfree(&proc_regex); |
| 215 | regfree(&imp_regex); |
| 216 | regfree(&var_regex); |
| 217 | regfree(&part_regex); |
| 218 | regfree(&rev_regex); |
| 219 | |
| 220 | return cpus; |
| 221 | } |
| 222 | |
| 223 | /** Get the maximim number of CPUs in the system by parsing /sys/devices/system/cpu/present |
| 224 | * |
| 225 | * @return int Maximum number of CPUs |
| 226 | */ |
| 227 | int get_max_cpus() |
| 228 | { |
| 229 | int max_cpus = 1; |
| 230 | std::ifstream CPUspresent; |
| 231 | CPUspresent.open("/sys/devices/system/cpu/present", std::ios::in); |
| 232 | bool success = false; |
| 233 | |
| 234 | if(CPUspresent.is_open()) |
| 235 | { |
| 236 | std::string line; |
| 237 | |
| 238 | if(bool(getline(CPUspresent, line))) |
| 239 | { |
| 240 | /* The content of this file is a list of ranges or single values, e.g. |
| 241 | * 0-5, or 1-3,5,7 or similar. As we are interested in the |
| 242 | * max valid ID, we just need to find the last valid |
| 243 | * delimiter ('-' or ',') and parse the integer immediately after that. |
| 244 | */ |
| 245 | auto startfrom = line.begin(); |
| 246 | |
| 247 | for(auto i = line.begin(); i < line.end(); ++i) |
| 248 | { |
| 249 | if(*i == '-' || *i == ',') |
| 250 | { |
| 251 | startfrom = i + 1; |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | line.erase(line.begin(), startfrom); |
| 256 | |
| 257 | max_cpus = support::cpp11::stoi(line, nullptr) + 1; |
| 258 | success = true; |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | // Return std::thread::hardware_concurrency() as a fallback. |
| 263 | if(!success) |
| 264 | { |
| 265 | max_cpus = std::thread::hardware_concurrency(); |
| 266 | } |
| 267 | return max_cpus; |
| 268 | } |
Pablo Tello | 4e66d70 | 2022-03-07 18:20:12 +0000 | [diff] [blame] | 269 | #elif defined(__aarch64__) && defined(__APPLE__) /* !defined(BARE_METAL) && !defined(__APPLE__) && (defined(__arm__) || defined(__aarch64__)) */ |
Pablo Marquez Tello | 639f0f6 | 2022-01-21 15:25:27 +0000 | [diff] [blame] | 270 | /** Query features through sysctlbyname |
| 271 | * |
| 272 | * @return int value queried |
| 273 | */ |
Pablo Tello | 4e66d70 | 2022-03-07 18:20:12 +0000 | [diff] [blame] | 274 | int get_hw_capability(const std::string &cap) |
Pablo Marquez Tello | 639f0f6 | 2022-01-21 15:25:27 +0000 | [diff] [blame] | 275 | { |
Pablo Tello | 4e66d70 | 2022-03-07 18:20:12 +0000 | [diff] [blame] | 276 | int64_t result(0); |
| 277 | size_t size = sizeof(result); |
| 278 | sysctlbyname(cap.c_str(), &result, &size, NULL, 0); |
| 279 | return result; |
Pablo Marquez Tello | 639f0f6 | 2022-01-21 15:25:27 +0000 | [diff] [blame] | 280 | } |
Pablo Tello | 4e66d70 | 2022-03-07 18:20:12 +0000 | [diff] [blame] | 281 | #endif /* !defined(BARE_METAL) && !defined(__APPLE__) && !defined(__OpenBSD__) && (defined(__arm__) || defined(__aarch64__)) */ |
Michalis Spyrou | 20fca52 | 2021-06-07 14:23:57 +0100 | [diff] [blame] | 282 | |
| 283 | #if defined(BARE_METAL) && defined(__aarch64__) |
| 284 | uint64_t get_sve_feature_reg() |
| 285 | { |
| 286 | uint64_t svefr0 = 0; |
| 287 | __asm __volatile( |
| 288 | ".inst 0xd5380483 // mrs x3, ID_AA64ZFR0_EL1\n" |
| 289 | "MOV %0, X3" |
| 290 | : "=r"(svefr0) |
| 291 | : |
| 292 | : "x3"); |
| 293 | return svefr0; |
| 294 | } |
| 295 | #endif /* defined(BARE_METAL) && defined(__aarch64__) */ |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 296 | } // namespace |
| 297 | |
| 298 | CpuInfo::CpuInfo(CpuIsaInfo isa, std::vector<CpuModel> cpus) |
| 299 | : _isa(std::move(isa)), _cpus(std::move(cpus)) |
| 300 | { |
| 301 | } |
| 302 | |
| 303 | CpuInfo CpuInfo::build() |
| 304 | { |
Pablo Tello | 4e66d70 | 2022-03-07 18:20:12 +0000 | [diff] [blame] | 305 | #if !defined(_WIN64) && !defined(BARE_METAL) && !defined(__APPLE__) && !defined(__OpenBSD__) && (defined(__arm__) || defined(__aarch64__)) |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 306 | const uint32_t hwcaps = getauxval(AT_HWCAP); |
| 307 | const uint32_t hwcaps2 = getauxval(AT_HWCAP2); |
| 308 | const uint32_t max_cpus = get_max_cpus(); |
| 309 | |
| 310 | // Populate midr values |
| 311 | std::vector<uint32_t> cpus_midr; |
| 312 | if(hwcaps & ARM_COMPUTE_CPU_FEATURE_HWCAP_CPUID) |
| 313 | { |
| 314 | cpus_midr = midr_from_cpuid(max_cpus); |
| 315 | } |
| 316 | if(cpus_midr.empty()) |
| 317 | { |
| 318 | cpus_midr = midr_from_proc_cpuinfo(max_cpus); |
| 319 | } |
| 320 | if(cpus_midr.empty()) |
| 321 | { |
| 322 | cpus_midr.resize(max_cpus, 0); |
| 323 | } |
| 324 | |
| 325 | // Populate isa (Assume homogeneous ISA specification) |
| 326 | CpuIsaInfo isa = init_cpu_isa_from_hwcaps(hwcaps, hwcaps2, cpus_midr.back()); |
| 327 | |
| 328 | // Convert midr to models |
| 329 | std::vector<CpuModel> cpus_model; |
| 330 | std::transform(std::begin(cpus_midr), std::end(cpus_midr), std::back_inserter(cpus_model), |
| 331 | [](uint32_t midr) -> CpuModel { return midr_to_model(midr); }); |
| 332 | |
| 333 | CpuInfo info(isa, cpus_model); |
| 334 | return info; |
| 335 | |
Pablo Tello | 4e66d70 | 2022-03-07 18:20:12 +0000 | [diff] [blame] | 336 | #elif(BARE_METAL) && defined(__aarch64__) /* !defined(BARE_METAL) && !defined(__APPLE__) && !defined(__OpenBSD__) && (defined(__arm__) || defined(__aarch64__)) */ |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 337 | |
| 338 | // Assume single CPU in bare metal mode. Just read the ID register and feature bits directly. |
Viet-Hoa Do | 03b2971 | 2022-06-01 11:47:14 +0100 | [diff] [blame] | 339 | uint64_t isar0 = 0, isar1 = 0, pfr0 = 0, pfr1 = 0, svefr0 = 0, midr = 0; |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 340 | ARM_COMPUTE_GET_FEATURE_REG(isar0, ID_AA64ISAR0_EL1); |
| 341 | ARM_COMPUTE_GET_FEATURE_REG(isar1, ID_AA64ISAR1_EL1); |
| 342 | ARM_COMPUTE_GET_FEATURE_REG(pfr0, ID_AA64PFR0_EL1); |
Viet-Hoa Do | 03b2971 | 2022-06-01 11:47:14 +0100 | [diff] [blame] | 343 | ARM_COMPUTE_GET_FEATURE_REG(pfr1, ID_AA64PFR1_EL1); |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 344 | ARM_COMPUTE_GET_FEATURE_REG(midr, MIDR_EL1); |
| 345 | if((pfr0 >> 32) & 0xf) |
| 346 | { |
| 347 | svefr0 = get_sve_feature_reg(); |
| 348 | } |
| 349 | |
Viet-Hoa Do | 03b2971 | 2022-06-01 11:47:14 +0100 | [diff] [blame] | 350 | CpuIsaInfo isa = init_cpu_isa_from_regs(isar0, isar1, pfr0, pfr1, svefr0, midr); |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 351 | std::vector<CpuModel> cpus_model(1, midr_to_model(midr)); |
| 352 | CpuInfo info(isa, cpus_model); |
| 353 | return info; |
Pablo Marquez Tello | 639f0f6 | 2022-01-21 15:25:27 +0000 | [diff] [blame] | 354 | #elif defined(__aarch64__) && defined(__APPLE__) /* #elif(BARE_METAL) && defined(__aarch64__) */ |
Pablo Marquez Tello | 67c3c63 | 2023-01-23 17:00:41 +0000 | [diff] [blame] | 355 | int ncpus = get_hw_capability("hw.perflevel0.logicalcpu"); |
Pablo Tello | 4e66d70 | 2022-03-07 18:20:12 +0000 | [diff] [blame] | 356 | CpuIsaInfo isainfo; |
Pablo Marquez Tello | 639f0f6 | 2022-01-21 15:25:27 +0000 | [diff] [blame] | 357 | std::vector<CpuModel> cpus_model(ncpus); |
| 358 | isainfo.neon = get_hw_capability("hw.optional.neon"); |
| 359 | isainfo.fp16 = get_hw_capability("hw.optional.neon_fp16"); |
Pablo Tello | 4e66d70 | 2022-03-07 18:20:12 +0000 | [diff] [blame] | 360 | isainfo.dot = get_hw_capability("hw.optional.arm.FEAT_DotProd"); |
| 361 | CpuInfo info(isainfo, cpus_model); |
Pablo Marquez Tello | 639f0f6 | 2022-01-21 15:25:27 +0000 | [diff] [blame] | 362 | return info; |
Pablo Tello | 4e66d70 | 2022-03-07 18:20:12 +0000 | [diff] [blame] | 363 | #else /* #elif defined(__aarch64__) && defined(__APPLE__) */ |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 364 | CpuInfo info(CpuIsaInfo(), { CpuModel::GENERIC }); |
| 365 | return info; |
Pablo Tello | 4e66d70 | 2022-03-07 18:20:12 +0000 | [diff] [blame] | 366 | #endif /* !defined(BARE_METAL) && !defined(__APPLE__) && !defined(__OpenBSD__) && (defined(__arm__) || defined(__aarch64__)) */ |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 367 | } |
| 368 | |
| 369 | CpuModel CpuInfo::cpu_model(uint32_t cpuid) const |
| 370 | { |
| 371 | if(cpuid < _cpus.size()) |
| 372 | { |
| 373 | return _cpus[cpuid]; |
| 374 | } |
| 375 | return CpuModel::GENERIC; |
| 376 | } |
| 377 | |
| 378 | CpuModel CpuInfo::cpu_model() const |
| 379 | { |
Pablo Tello | 4e66d70 | 2022-03-07 18:20:12 +0000 | [diff] [blame] | 380 | #if defined(_WIN64) || defined(BARE_METAL) || defined(__APPLE__) || defined(__OpenBSD__) || (!defined(__arm__) && !defined(__aarch64__)) |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 381 | return cpu_model(0); |
Kevin Lo | 7195f71 | 2022-01-07 15:46:02 +0800 | [diff] [blame] | 382 | #else /* defined(BARE_METAL) || defined(__APPLE__) || defined(__OpenBSD__) || (!defined(__arm__) && !defined(__aarch64__)) */ |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 383 | return cpu_model(sched_getcpu()); |
Kevin Lo | 7195f71 | 2022-01-07 15:46:02 +0800 | [diff] [blame] | 384 | #endif /* defined(BARE_METAL) || defined(__APPLE__) || defined(__OpenBSD__) || (!defined(__arm__) && !defined(__aarch64__)) */ |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 385 | } |
| 386 | |
| 387 | uint32_t CpuInfo::num_cpus() const |
| 388 | { |
| 389 | return _cpus.size(); |
| 390 | } |
| 391 | |
| 392 | uint32_t num_threads_hint() |
| 393 | { |
| 394 | unsigned int num_threads_hint = 1; |
| 395 | |
Viet-Hoa Do | 13321f7 | 2023-02-24 17:32:27 +0000 | [diff] [blame] | 396 | #if !defined(BARE_METAL) && !defined(_WIN64) && !defined(ARM_COMPUTE_DISABLE_THREADS_HINT) |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 397 | std::vector<std::string> cpus; |
| 398 | cpus.reserve(64); |
| 399 | |
| 400 | // CPU part regex |
| 401 | regex_t cpu_part_rgx; |
| 402 | memset(&cpu_part_rgx, 0, sizeof(regex_t)); |
| 403 | int ret_status = regcomp(&cpu_part_rgx, R"(.*CPU part.+/?\:[[:space:]]+([[:alnum:]]+).*)", REG_EXTENDED); |
| 404 | ARM_COMPUTE_UNUSED(ret_status); |
| 405 | ARM_COMPUTE_ERROR_ON_MSG(ret_status != 0, "Regex compilation failed."); |
| 406 | |
| 407 | // Read cpuinfo and get occurrence of each core |
| 408 | std::ifstream cpuinfo_file("/proc/cpuinfo", std::ios::in); |
| 409 | if(cpuinfo_file.is_open()) |
| 410 | { |
| 411 | std::string line; |
| 412 | while(bool(getline(cpuinfo_file, line))) |
| 413 | { |
| 414 | std::array<regmatch_t, 2> match; |
| 415 | if(regexec(&cpu_part_rgx, line.c_str(), 2, match.data(), 0) == 0) |
| 416 | { |
| 417 | cpus.emplace_back(line.substr(match[1].rm_so, (match[1].rm_eo - match[1].rm_so))); |
| 418 | } |
| 419 | } |
| 420 | } |
| 421 | regfree(&cpu_part_rgx); |
| 422 | |
| 423 | // Get min number of threads |
| 424 | std::sort(std::begin(cpus), std::end(cpus)); |
| 425 | auto least_frequent_cpu_occurences = [](const std::vector<std::string> &cpus) -> uint32_t |
| 426 | { |
| 427 | std::unordered_map<std::string, uint32_t> cpus_freq; |
| 428 | for(const auto &cpu : cpus) |
| 429 | { |
| 430 | cpus_freq[cpu]++; |
| 431 | } |
| 432 | |
| 433 | uint32_t vmin = cpus.size() + 1; |
| 434 | for(const auto &cpu_freq : cpus_freq) |
| 435 | { |
| 436 | vmin = std::min(vmin, cpu_freq.second); |
| 437 | } |
| 438 | return vmin; |
| 439 | }; |
| 440 | |
| 441 | // Set thread hint |
| 442 | num_threads_hint = cpus.empty() ? std::thread::hardware_concurrency() : least_frequent_cpu_occurences(cpus); |
Viet-Hoa Do | 13321f7 | 2023-02-24 17:32:27 +0000 | [diff] [blame] | 443 | #endif /* !defined(BARE_METAL) && !defined(_WIN64) && !defined(ARM_COMPUTE_DISABLE_THREADS_HINT) */ |
Georgios Pinitas | 08302c1 | 2021-06-09 10:08:27 +0100 | [diff] [blame] | 444 | |
| 445 | return num_threads_hint; |
| 446 | } |
| 447 | } // namespace cpuinfo |
Pablo Marquez Tello | 639f0f6 | 2022-01-21 15:25:27 +0000 | [diff] [blame] | 448 | } // namespace arm_compute |