| /* |
| * Copyright (c) 2018 ARM Limited. |
| * |
| * SPDX-License-Identifier: MIT |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to |
| * deal in the Software without restriction, including without limitation the |
| * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| * sell copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in all |
| * copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| */ |
| #include "arm_compute/runtime/CPUUtils.h" |
| |
| #include "arm_compute/core/CPP/CPPTypes.h" |
| #include "arm_compute/core/Error.h" |
| #include "support/ToolchainSupport.h" |
| |
| #include <array> |
| #include <cstdlib> |
| #include <cstring> |
| #include <fcntl.h> |
| #include <fstream> |
| #include <map> |
| #include <sched.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| #ifndef BARE_METAL |
| #include <regex> |
| #include <thread> |
| #endif /* BARE_METAL */ |
| |
| #if !defined(BARE_METAL) && (defined(__arm__) || defined(__aarch64__)) |
| #include <sys/auxv.h> |
| |
| /* Get HWCAP bits from asm/hwcap.h */ |
| #include <asm/hwcap.h> |
| #endif /* !BARE_METAL */ |
| |
| /* Make sure the bits we care about are defined, just in case asm/hwcap.h is |
| * out of date (or for bare metal mode) */ |
| #ifndef HWCAP_ASIMDHP |
| #define HWCAP_ASIMDHP (1 << 10) |
| #endif /* HWCAP_ASIMDHP */ |
| |
| #ifndef HWCAP_CPUID |
| #define HWCAP_CPUID (1 << 11) |
| #endif /* HWCAP_CPUID */ |
| |
| #ifndef HWCAP_ASIMDDP |
| #define HWCAP_ASIMDDP (1 << 20) |
| #endif /* HWCAP_ASIMDDP */ |
| |
| namespace |
| { |
| using namespace arm_compute; |
| |
| #if !defined(BARE_METAL) && (defined(__arm__) || defined(__aarch64__)) |
| |
| bool model_supports_dot(CPUModel model) |
| { |
| switch(model) |
| { |
| case CPUModel::GENERIC_FP16_DOT: |
| case CPUModel::A55r1: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| bool model_supports_fp16(CPUModel model) |
| { |
| switch(model) |
| { |
| case CPUModel::GENERIC_FP16: |
| case CPUModel::GENERIC_FP16_DOT: |
| case CPUModel::A55r1: |
| return true; |
| default: |
| return false; |
| } |
| } |
| /* Convert an MIDR register value to a CPUModel enum value. */ |
| CPUModel midr_to_model(const unsigned int midr) |
| { |
| CPUModel model = CPUModel::GENERIC; |
| |
| // Unpack variant and CPU ID |
| const int implementer = (midr >> 24) & 0xFF; |
| const int variant = (midr >> 20) & 0xF; |
| const int cpunum = (midr >> 4) & 0xFFF; |
| |
| if(implementer == 0x41) // Arm CPUs |
| { |
| // Only CPUs we have code paths for are detected. All other CPUs can be safely classed as "GENERIC" |
| switch(cpunum) |
| { |
| case 0xd03: // A53 |
| case 0xd04: // A35 |
| model = CPUModel::A53; |
| break; |
| case 0xd05: // A55 |
| if(variant != 0) |
| { |
| model = CPUModel::A55r1; |
| } |
| else |
| { |
| model = CPUModel::A55r0; |
| } |
| break; |
| case 0xd0a: // A75 |
| if(variant != 0) |
| { |
| model = CPUModel::GENERIC_FP16_DOT; |
| } |
| else |
| { |
| model = CPUModel::GENERIC_FP16; |
| } |
| break; |
| case 0xd0b: // A76 |
| case 0xd06: // Helios FIXME: Unreleased CPU, remove before release |
| case 0xd0c: // Ares FIXME: Unreleased CPU, remove before release |
| case 0xd0d: // Deimos FIXME: Unreleased CPU, remove before release |
| model = CPUModel::GENERIC_FP16_DOT; |
| break; |
| default: |
| model = CPUModel::GENERIC; |
| break; |
| } |
| } |
| |
| return model; |
| } |
| |
| void populate_models_cpuid(std::vector<CPUModel> &cpusv) |
| { |
| // If the CPUID capability is present, MIDR information is provided in /sys. Use that to populate the CPU model table. |
| uint32_t i = 0; |
| for(auto &c : cpusv) |
| { |
| std::stringstream str; |
| str << "/sys/devices/system/cpu/cpu" << i++ << "/regs/identification/midr_el1"; |
| std::ifstream file; |
| file.open(str.str(), std::ios::in); |
| if(file.is_open()) |
| { |
| std::string line; |
| if(bool(getline(file, line))) |
| { |
| const unsigned long midr = support::cpp11::stoul(line, nullptr, support::cpp11::NumericBase::BASE_16); |
| c = midr_to_model(midr & 0xffffffff); |
| } |
| } |
| } |
| } |
| |
| void populate_models_cpuinfo(std::vector<CPUModel> &cpusv) |
| { |
| // If "long-form" cpuinfo is present, parse that to populate models. |
| std::regex proc_regex("^processor.*(\\d+)$"); |
| std::regex imp_regex("^CPU implementer.*0x(..)$"); |
| std::regex var_regex("^CPU variant.*0x(.)$"); |
| std::regex part_regex("^CPU part.*0x(...)$"); |
| std::regex rev_regex("^CPU revision.*(\\d+)$"); |
| |
| std::ifstream file; |
| file.open("/proc/cpuinfo", std::ios::in); |
| |
| if(file.is_open()) |
| { |
| std::string line; |
| int midr = 0; |
| int curcpu = -1; |
| |
| while(bool(getline(file, line))) |
| { |
| std::smatch match; |
| |
| if(std::regex_match(line, match, proc_regex)) |
| { |
| std::string id = match[1]; |
| int newcpu = support::cpp11::stoi(id, nullptr); |
| |
| if(curcpu >= 0 && midr == 0) |
| { |
| // Matched a new CPU ID without any description of the previous one - looks like old format. |
| return; |
| } |
| |
| if(curcpu >= 0) |
| { |
| cpusv[curcpu] = midr_to_model(midr); |
| } |
| |
| midr = 0; |
| curcpu = newcpu; |
| |
| continue; |
| } |
| |
| if(std::regex_match(line, match, imp_regex)) |
| { |
| int impv = support::cpp11::stoi(match[1], nullptr, support::cpp11::NumericBase::BASE_16); |
| midr |= (impv << 24); |
| continue; |
| } |
| |
| if(std::regex_match(line, match, var_regex)) |
| { |
| int varv = support::cpp11::stoi(match[1], nullptr, support::cpp11::NumericBase::BASE_16); |
| midr |= (varv << 20); |
| continue; |
| } |
| |
| if(std::regex_match(line, match, part_regex)) |
| { |
| int partv = support::cpp11::stoi(match[1], nullptr, support::cpp11::NumericBase::BASE_16); |
| midr |= (partv << 4); |
| continue; |
| } |
| |
| if(std::regex_match(line, match, rev_regex)) |
| { |
| int regv = support::cpp11::stoi(match[1], nullptr); |
| midr |= (regv); |
| midr |= (0xf << 16); |
| continue; |
| } |
| } |
| |
| if(curcpu >= 0) |
| { |
| cpusv[curcpu] = midr_to_model(midr); |
| } |
| } |
| } |
| |
| int get_max_cpus() |
| { |
| int max_cpus = 1; |
| #if !defined(BARE_METAL) && (defined(__arm__) || defined(__aarch64__)) |
| std::ifstream CPUspresent; |
| CPUspresent.open("/sys/devices/system/cpu/present", std::ios::in); |
| bool success = false; |
| |
| if(CPUspresent.is_open()) |
| { |
| std::string line; |
| |
| if(bool(getline(CPUspresent, line))) |
| { |
| /* The content of this file is a list of ranges or single values, e.g. |
| * 0-5, or 1-3,5,7 or similar. As we are interested in the |
| * max valid ID, we just need to find the last valid |
| * delimiter ('-' or ',') and parse the integer immediately after that. |
| */ |
| auto startfrom = line.begin(); |
| |
| for(auto i = line.begin(); i < line.end(); ++i) |
| { |
| if(*i == '-' || *i == ',') |
| { |
| startfrom = i + 1; |
| } |
| } |
| |
| line.erase(line.begin(), startfrom); |
| |
| max_cpus = support::cpp11::stoi(line, nullptr) + 1; |
| success = true; |
| } |
| } |
| |
| // Return std::thread::hardware_concurrency() as a fallback. |
| if(!success) |
| { |
| max_cpus = std::thread::hardware_concurrency(); |
| } |
| #endif /* BARE_METAL */ |
| return max_cpus; |
| } |
| #endif /* !defined(BARE_METAL) && (defined(__arm__) || defined(__aarch64__)) */ |
| |
| } // namespace |
| |
| namespace arm_compute |
| { |
| void get_cpu_configuration(CPUInfo &cpuinfo) |
| { |
| #if !defined(BARE_METAL) && (defined(__arm__) || defined(__aarch64__)) |
| bool cpuid = false; |
| bool hwcaps_fp16_support = false; |
| bool hwcaps_dot_support = false; |
| |
| const uint32_t hwcaps = getauxval(AT_HWCAP); |
| |
| if((hwcaps & HWCAP_CPUID) != 0) |
| { |
| cpuid = true; |
| } |
| |
| if((hwcaps & HWCAP_ASIMDHP) != 0) |
| { |
| hwcaps_fp16_support = true; |
| } |
| |
| #if defined(__aarch64__) |
| if((hwcaps & HWCAP_ASIMDDP) != 0) |
| { |
| hwcaps_dot_support = true; |
| } |
| #endif /* defined(__aarch64__) */ |
| |
| const unsigned int max_cpus = get_max_cpus(); |
| cpuinfo.set_cpu_num(max_cpus); |
| std::vector<CPUModel> percpu(max_cpus, CPUModel::GENERIC); |
| if(cpuid) |
| { |
| populate_models_cpuid(percpu); |
| } |
| else |
| { |
| populate_models_cpuinfo(percpu); |
| } |
| int j(0); |
| // Update dot product and FP16 support if one of the CPUs support these features |
| // We assume that the system does not have mixed architectures |
| bool one_supports_dot = false; |
| bool one_supports_fp16 = false; |
| for(const auto &v : percpu) |
| { |
| one_supports_dot |= model_supports_dot(v); |
| one_supports_fp16 |= model_supports_fp16(v); |
| cpuinfo.set_cpu_model(j++, v); |
| } |
| cpuinfo.set_dotprod(one_supports_dot || hwcaps_dot_support); |
| cpuinfo.set_fp16(one_supports_fp16 || hwcaps_fp16_support); |
| #else /* !defined(BARE_METAL) && (defined(__arm__) || defined(__aarch64__)) */ |
| ARM_COMPUTE_UNUSED(cpuinfo); |
| #endif /* !defined(BARE_METAL) && (defined(__arm__) || defined(__aarch64__)) */ |
| } |
| |
| unsigned int get_threads_hint() |
| { |
| unsigned int num_threads_hint = 1; |
| |
| #ifndef BARE_METAL |
| std::map<std::string, unsigned int> cpu_part_occurrence_map; |
| |
| // CPU part regex |
| std::regex cpu_part_rgx(R"(.*CPU part.+?(?=:).+?(?=\w+)(\w+).*)"); |
| std::smatch cpu_part_match; |
| |
| // Read cpuinfo and get occurrence of each core |
| std::ifstream cpuinfo; |
| cpuinfo.open("/proc/cpuinfo", std::ios::in); |
| if(cpuinfo.is_open()) |
| { |
| std::string line; |
| while(bool(getline(cpuinfo, line))) |
| { |
| if(std::regex_search(line.cbegin(), line.cend(), cpu_part_match, cpu_part_rgx)) |
| { |
| std::string cpu_part = cpu_part_match[1]; |
| if(cpu_part_occurrence_map.find(cpu_part) != cpu_part_occurrence_map.end()) |
| { |
| cpu_part_occurrence_map[cpu_part]++; |
| } |
| else |
| { |
| cpu_part_occurrence_map[cpu_part] = 1; |
| } |
| } |
| } |
| } |
| |
| // Get min number of threads |
| auto min_common_cores = std::min_element(cpu_part_occurrence_map.begin(), cpu_part_occurrence_map.end(), |
| [](const std::pair<std::string, unsigned int> &p1, const std::pair<std::string, unsigned int> &p2) |
| { |
| return p1.second < p2.second; |
| }); |
| |
| // Set thread hint |
| num_threads_hint = cpu_part_occurrence_map.empty() ? std::thread::hardware_concurrency() : min_common_cores->second; |
| #endif /* BARE_METAL */ |
| |
| return num_threads_hint; |
| } |
| |
| } // namespace arm_compute |