2  * Copyright (c) 2021-2023 Arm Limited.
4  * SPDX-License-Identifier: MIT
66 /** Extract MIDR using CPUID information that are exposed to user-space
68  * @param[in] max_num_cpus Maximum number of possible CPUs
74     std::vector<uint32_t> cpus;  in midr_from_cpuid()  local
85 …     cpus.emplace_back(support::cpp11::stoul(line, nullptr, support::cpp11::NumericBase::BASE_16));  in midr_from_cpuid()
89     return cpus;  in midr_from_cpuid()
92 /** Extract MIDR by parsing the /proc/cpuinfo meta-data
94  * @param[in] max_num_cpus Maximum number of possible CPUs
100     std::vector<uint32_t> cpus;  in midr_from_proc_cpuinfo()  local
115     // If "long-form" cpuinfo is present, parse that to populate models.  in midr_from_proc_cpuinfo()
129         int         curcpu = -1;  in midr_from_proc_cpuinfo()
137                 std::string id     = line.substr(match[1].rm_so, (match[1].rm_eo - match[1].rm_so));  in midr_from_proc_cpuinfo()
142 …       // Matched a new CPU ID without any description of the previous one - looks like old format.  in midr_from_proc_cpuinfo()
148                     cpus.emplace_back(midr);  in midr_from_proc_cpuinfo()
164                 std::string subexp = line.substr(match[1].rm_so, (match[1].rm_eo - match[1].rm_so));  in midr_from_proc_cpuinfo()
174                 std::string subexp = line.substr(match[1].rm_so, (match[1].rm_eo - match[1].rm_so));  in midr_from_proc_cpuinfo()
184                 std::string subexp = line.substr(match[1].rm_so, (match[1].rm_eo - match[1].rm_so));  in midr_from_proc_cpuinfo()
194                 std::string subexp = line.substr(match[1].rm_so, (match[1].rm_eo - match[1].rm_so));  in midr_from_proc_cpuinfo()
205             cpus.emplace_back(midr);  in midr_from_proc_cpuinfo()
220     return cpus;  in midr_from_proc_cpuinfo()
223 /** Get the maximim number of CPUs in the system by parsing /sys/devices/system/cpu/present
225  * @return int Maximum number of CPUs
241                  * 0-5, or 1-3,5,7 or similar.  As we are interested in the  in get_max_cpus()
243                  * delimiter ('-' or ',') and parse the integer immediately after that.  in get_max_cpus()
249                 if(*i == '-' || *i == ',')  in get_max_cpus()
298 CpuInfo::CpuInfo(CpuIsaInfo isa, std::vector<CpuModel> cpus)  in CpuInfo()  argument
299     : _isa(std::move(isa)), _cpus(std::move(cpus))  in CpuInfo()
331                    [](uint32_t midr) -> CpuModel { return midr_to_model(midr); });  in build()
397     std::vector<std::string> cpus;  in num_threads_hint()  local
398     cpus.reserve(64);  in num_threads_hint()
417                 cpus.emplace_back(line.substr(match[1].rm_so, (match[1].rm_eo - match[1].rm_so)));  in num_threads_hint()
424     std::sort(std::begin(cpus), std::end(cpus));  in num_threads_hint()
425     auto least_frequent_cpu_occurences = [](const std::vector<std::string> &cpus) -> uint32_t  in num_threads_hint()
428         for(const auto &cpu : cpus)  in num_threads_hint()
433         uint32_t vmin = cpus.size() + 1;  in num_threads_hint()
442 …num_threads_hint = cpus.empty() ? std::thread::hardware_concurrency() : least_frequent_cpu_occuren…  in num_threads_hint()