dep: Add cpuinfo
This commit is contained in:
Connor McLaughlin
406
dep/cpuinfo/src/linux/processors.c
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406
dep/cpuinfo/src/linux/processors.c
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@ -0,0 +1,406 @@
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#if !defined(__ANDROID__)
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/*
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* sched.h is only used for CPU_SETSIZE constant.
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* Android NDK headers before platform 21 do have this constant in sched.h
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*/
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#include <sched.h>
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#endif
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#include <linux/api.h>
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#include <cpuinfo/log.h>
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#define STRINGIFY(token) #token
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#define KERNEL_MAX_FILENAME "/sys/devices/system/cpu/kernel_max"
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#define KERNEL_MAX_FILESIZE 32
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#define FREQUENCY_FILENAME_SIZE (sizeof("/sys/devices/system/cpu/cpu" STRINGIFY(UINT32_MAX) "/cpufreq/cpuinfo_max_freq"))
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#define MAX_FREQUENCY_FILENAME_FORMAT "/sys/devices/system/cpu/cpu%" PRIu32 "/cpufreq/cpuinfo_max_freq"
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#define MIN_FREQUENCY_FILENAME_FORMAT "/sys/devices/system/cpu/cpu%" PRIu32 "/cpufreq/cpuinfo_min_freq"
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#define FREQUENCY_FILESIZE 32
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#define PACKAGE_ID_FILENAME_SIZE (sizeof("/sys/devices/system/cpu/cpu" STRINGIFY(UINT32_MAX) "/topology/physical_package_id"))
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#define PACKAGE_ID_FILENAME_FORMAT "/sys/devices/system/cpu/cpu%" PRIu32 "/topology/physical_package_id"
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#define PACKAGE_ID_FILESIZE 32
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#define CORE_ID_FILENAME_SIZE (sizeof("/sys/devices/system/cpu/cpu" STRINGIFY(UINT32_MAX) "/topology/core_id"))
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#define CORE_ID_FILENAME_FORMAT "/sys/devices/system/cpu/cpu%" PRIu32 "/topology/core_id"
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#define CORE_ID_FILESIZE 32
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#define CORE_SIBLINGS_FILENAME_SIZE (sizeof("/sys/devices/system/cpu/cpu" STRINGIFY(UINT32_MAX) "/topology/core_siblings_list"))
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#define CORE_SIBLINGS_FILENAME_FORMAT "/sys/devices/system/cpu/cpu%" PRIu32 "/topology/core_siblings_list"
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#define THREAD_SIBLINGS_FILENAME_SIZE (sizeof("/sys/devices/system/cpu/cpu" STRINGIFY(UINT32_MAX) "/topology/thread_siblings_list"))
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#define THREAD_SIBLINGS_FILENAME_FORMAT "/sys/devices/system/cpu/cpu%" PRIu32 "/topology/thread_siblings_list"
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#define POSSIBLE_CPULIST_FILENAME "/sys/devices/system/cpu/possible"
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#define PRESENT_CPULIST_FILENAME "/sys/devices/system/cpu/present"
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inline static const char* parse_number(const char* start, const char* end, uint32_t number_ptr[restrict static 1]) {
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uint32_t number = 0;
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const char* parsed = start;
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for (; parsed != end; parsed++) {
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const uint32_t digit = (uint32_t) (uint8_t) (*parsed) - (uint32_t) '0';
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if (digit >= 10) {
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break;
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}
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number = number * UINT32_C(10) + digit;
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}
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*number_ptr = number;
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return parsed;
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}
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/* Locale-independent */
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inline static bool is_whitespace(char c) {
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switch (c) {
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case ' ':
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case '\t':
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case '\n':
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case '\r':
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return true;
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default:
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return false;
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}
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}
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#if defined(__ANDROID__) && !defined(CPU_SETSIZE)
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/*
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* Android NDK headers before platform 21 do not define CPU_SETSIZE,
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* so we hard-code its value, as defined in platform 21 headers
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*/
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#if defined(__LP64__)
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static const uint32_t default_max_processors_count = 1024;
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#else
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static const uint32_t default_max_processors_count = 32;
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#endif
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#else
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static const uint32_t default_max_processors_count = CPU_SETSIZE;
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#endif
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static bool uint32_parser(const char* text_start, const char* text_end, void* context) {
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if (text_start == text_end) {
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cpuinfo_log_error("failed to parse file %s: file is empty", KERNEL_MAX_FILENAME);
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return false;
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}
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uint32_t kernel_max = 0;
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const char* parsed_end = parse_number(text_start, text_end, &kernel_max);
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if (parsed_end == text_start) {
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cpuinfo_log_error("failed to parse file %s: \"%.*s\" is not an unsigned number",
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KERNEL_MAX_FILENAME, (int) (text_end - text_start), text_start);
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return false;
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} else {
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for (const char* char_ptr = parsed_end; char_ptr != text_end; char_ptr++) {
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if (!is_whitespace(*char_ptr)) {
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cpuinfo_log_warning("non-whitespace characters \"%.*s\" following number in file %s are ignored",
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(int) (text_end - char_ptr), char_ptr, KERNEL_MAX_FILENAME);
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break;
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}
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}
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}
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uint32_t* kernel_max_ptr = (uint32_t*) context;
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*kernel_max_ptr = kernel_max;
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return true;
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}
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uint32_t cpuinfo_linux_get_max_processors_count(void) {
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uint32_t kernel_max;
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if (cpuinfo_linux_parse_small_file(KERNEL_MAX_FILENAME, KERNEL_MAX_FILESIZE, uint32_parser, &kernel_max)) {
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cpuinfo_log_debug("parsed kernel_max value of %"PRIu32" from %s", kernel_max, KERNEL_MAX_FILENAME);
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if (kernel_max >= default_max_processors_count) {
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cpuinfo_log_warning("kernel_max value of %"PRIu32" parsed from %s exceeds platform-default limit %"PRIu32,
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kernel_max, KERNEL_MAX_FILENAME, default_max_processors_count - 1);
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}
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return kernel_max + 1;
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} else {
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cpuinfo_log_warning("using platform-default max processors count = %"PRIu32, default_max_processors_count);
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return default_max_processors_count;
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}
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}
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uint32_t cpuinfo_linux_get_processor_max_frequency(uint32_t processor) {
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char max_frequency_filename[FREQUENCY_FILENAME_SIZE];
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const int chars_formatted = snprintf(
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max_frequency_filename, FREQUENCY_FILENAME_SIZE, MAX_FREQUENCY_FILENAME_FORMAT, processor);
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if ((unsigned int) chars_formatted >= FREQUENCY_FILENAME_SIZE) {
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cpuinfo_log_warning("failed to format filename for max frequency of processor %"PRIu32, processor);
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return 0;
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}
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uint32_t max_frequency;
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if (cpuinfo_linux_parse_small_file(max_frequency_filename, FREQUENCY_FILESIZE, uint32_parser, &max_frequency)) {
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cpuinfo_log_debug("parsed max frequency value of %"PRIu32" KHz for logical processor %"PRIu32" from %s",
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max_frequency, processor, max_frequency_filename);
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return max_frequency;
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} else {
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cpuinfo_log_warning("failed to parse max frequency for processor %"PRIu32" from %s",
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processor, max_frequency_filename);
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return 0;
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}
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}
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uint32_t cpuinfo_linux_get_processor_min_frequency(uint32_t processor) {
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char min_frequency_filename[FREQUENCY_FILENAME_SIZE];
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const int chars_formatted = snprintf(
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min_frequency_filename, FREQUENCY_FILENAME_SIZE, MIN_FREQUENCY_FILENAME_FORMAT, processor);
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if ((unsigned int) chars_formatted >= FREQUENCY_FILENAME_SIZE) {
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cpuinfo_log_warning("failed to format filename for min frequency of processor %"PRIu32, processor);
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return 0;
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}
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uint32_t min_frequency;
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if (cpuinfo_linux_parse_small_file(min_frequency_filename, FREQUENCY_FILESIZE, uint32_parser, &min_frequency)) {
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cpuinfo_log_debug("parsed min frequency value of %"PRIu32" KHz for logical processor %"PRIu32" from %s",
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min_frequency, processor, min_frequency_filename);
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return min_frequency;
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} else {
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/*
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* This error is less severe than parsing max frequency, because min frequency is only useful for clustering,
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* while max frequency is also needed for peak FLOPS calculation.
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*/
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cpuinfo_log_info("failed to parse min frequency for processor %"PRIu32" from %s",
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processor, min_frequency_filename);
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return 0;
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}
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}
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bool cpuinfo_linux_get_processor_core_id(uint32_t processor, uint32_t core_id_ptr[restrict static 1]) {
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char core_id_filename[PACKAGE_ID_FILENAME_SIZE];
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const int chars_formatted = snprintf(
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core_id_filename, CORE_ID_FILENAME_SIZE, CORE_ID_FILENAME_FORMAT, processor);
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if ((unsigned int) chars_formatted >= CORE_ID_FILENAME_SIZE) {
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cpuinfo_log_warning("failed to format filename for core id of processor %"PRIu32, processor);
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return 0;
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}
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uint32_t core_id;
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if (cpuinfo_linux_parse_small_file(core_id_filename, CORE_ID_FILESIZE, uint32_parser, &core_id)) {
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cpuinfo_log_debug("parsed core id value of %"PRIu32" for logical processor %"PRIu32" from %s",
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core_id, processor, core_id_filename);
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*core_id_ptr = core_id;
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return true;
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} else {
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cpuinfo_log_info("failed to parse core id for processor %"PRIu32" from %s",
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processor, core_id_filename);
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return false;
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}
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}
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bool cpuinfo_linux_get_processor_package_id(uint32_t processor, uint32_t package_id_ptr[restrict static 1]) {
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char package_id_filename[PACKAGE_ID_FILENAME_SIZE];
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const int chars_formatted = snprintf(
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package_id_filename, PACKAGE_ID_FILENAME_SIZE, PACKAGE_ID_FILENAME_FORMAT, processor);
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if ((unsigned int) chars_formatted >= PACKAGE_ID_FILENAME_SIZE) {
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cpuinfo_log_warning("failed to format filename for package id of processor %"PRIu32, processor);
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return 0;
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}
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uint32_t package_id;
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if (cpuinfo_linux_parse_small_file(package_id_filename, PACKAGE_ID_FILESIZE, uint32_parser, &package_id)) {
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cpuinfo_log_debug("parsed package id value of %"PRIu32" for logical processor %"PRIu32" from %s",
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package_id, processor, package_id_filename);
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*package_id_ptr = package_id;
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return true;
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} else {
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cpuinfo_log_info("failed to parse package id for processor %"PRIu32" from %s",
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processor, package_id_filename);
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return false;
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}
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}
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static bool max_processor_number_parser(uint32_t processor_list_start, uint32_t processor_list_end, void* context) {
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uint32_t* processor_number_ptr = (uint32_t*) context;
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const uint32_t processor_list_last = processor_list_end - 1;
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if (*processor_number_ptr < processor_list_last) {
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*processor_number_ptr = processor_list_last;
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}
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return true;
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}
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uint32_t cpuinfo_linux_get_max_possible_processor(uint32_t max_processors_count) {
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uint32_t max_possible_processor = 0;
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if (!cpuinfo_linux_parse_cpulist(POSSIBLE_CPULIST_FILENAME, max_processor_number_parser, &max_possible_processor)) {
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#if CPUINFO_ARCH_ARM || CPUINFO_ARCH_ARM64
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cpuinfo_log_error("failed to parse the list of possible processors in %s", POSSIBLE_CPULIST_FILENAME);
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#else
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cpuinfo_log_warning("failed to parse the list of possible processors in %s", POSSIBLE_CPULIST_FILENAME);
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#endif
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return UINT32_MAX;
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}
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if (max_possible_processor >= max_processors_count) {
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cpuinfo_log_warning(
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"maximum possible processor number %"PRIu32" exceeds system limit %"PRIu32": truncating to the latter",
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max_possible_processor, max_processors_count - 1);
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max_possible_processor = max_processors_count - 1;
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}
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return max_possible_processor;
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}
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uint32_t cpuinfo_linux_get_max_present_processor(uint32_t max_processors_count) {
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uint32_t max_present_processor = 0;
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if (!cpuinfo_linux_parse_cpulist(PRESENT_CPULIST_FILENAME, max_processor_number_parser, &max_present_processor)) {
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#if CPUINFO_ARCH_ARM || CPUINFO_ARCH_ARM64
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cpuinfo_log_error("failed to parse the list of present processors in %s", PRESENT_CPULIST_FILENAME);
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#else
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cpuinfo_log_warning("failed to parse the list of present processors in %s", PRESENT_CPULIST_FILENAME);
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#endif
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return UINT32_MAX;
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}
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if (max_present_processor >= max_processors_count) {
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cpuinfo_log_warning(
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"maximum present processor number %"PRIu32" exceeds system limit %"PRIu32": truncating to the latter",
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max_present_processor, max_processors_count - 1);
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max_present_processor = max_processors_count - 1;
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}
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return max_present_processor;
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}
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struct detect_processors_context {
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uint32_t max_processors_count;
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uint32_t* processor0_flags;
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uint32_t processor_struct_size;
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uint32_t detected_flag;
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};
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static bool detect_processor_parser(uint32_t processor_list_start, uint32_t processor_list_end, void* context) {
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const uint32_t max_processors_count = ((struct detect_processors_context*) context)->max_processors_count;
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const uint32_t* processor0_flags = ((struct detect_processors_context*) context)->processor0_flags;
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const uint32_t processor_struct_size = ((struct detect_processors_context*) context)->processor_struct_size;
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const uint32_t detected_flag = ((struct detect_processors_context*) context)->detected_flag;
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for (uint32_t processor = processor_list_start; processor < processor_list_end; processor++) {
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if (processor >= max_processors_count) {
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break;
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}
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*((uint32_t*) ((uintptr_t) processor0_flags + processor_struct_size * processor)) |= detected_flag;
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}
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return true;
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}
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bool cpuinfo_linux_detect_possible_processors(uint32_t max_processors_count,
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uint32_t* processor0_flags, uint32_t processor_struct_size, uint32_t possible_flag)
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{
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struct detect_processors_context context = {
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.max_processors_count = max_processors_count,
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.processor0_flags = processor0_flags,
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.processor_struct_size = processor_struct_size,
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.detected_flag = possible_flag,
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};
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if (cpuinfo_linux_parse_cpulist(POSSIBLE_CPULIST_FILENAME, detect_processor_parser, &context)) {
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return true;
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} else {
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cpuinfo_log_warning("failed to parse the list of possible processors in %s", POSSIBLE_CPULIST_FILENAME);
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return false;
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}
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}
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bool cpuinfo_linux_detect_present_processors(uint32_t max_processors_count,
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uint32_t* processor0_flags, uint32_t processor_struct_size, uint32_t present_flag)
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{
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struct detect_processors_context context = {
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.max_processors_count = max_processors_count,
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.processor0_flags = processor0_flags,
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.processor_struct_size = processor_struct_size,
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.detected_flag = present_flag,
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};
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if (cpuinfo_linux_parse_cpulist(PRESENT_CPULIST_FILENAME, detect_processor_parser, &context)) {
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return true;
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} else {
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cpuinfo_log_warning("failed to parse the list of present processors in %s", PRESENT_CPULIST_FILENAME);
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return false;
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}
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}
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struct siblings_context {
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const char* group_name;
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uint32_t max_processors_count;
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uint32_t processor;
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cpuinfo_siblings_callback callback;
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void* callback_context;
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};
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static bool siblings_parser(uint32_t sibling_list_start, uint32_t sibling_list_end, struct siblings_context* context) {
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const char* group_name = context->group_name;
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const uint32_t max_processors_count = context->max_processors_count;
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const uint32_t processor = context->processor;
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if (sibling_list_end > max_processors_count) {
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cpuinfo_log_warning("ignore %s siblings %"PRIu32"-%"PRIu32" of processor %"PRIu32,
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group_name, max_processors_count, sibling_list_end - 1, processor);
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sibling_list_end = max_processors_count;
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}
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return context->callback(processor, sibling_list_start, sibling_list_end, context->callback_context);
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}
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bool cpuinfo_linux_detect_core_siblings(
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uint32_t max_processors_count,
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uint32_t processor,
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cpuinfo_siblings_callback callback,
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void* context)
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{
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char core_siblings_filename[CORE_SIBLINGS_FILENAME_SIZE];
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const int chars_formatted = snprintf(
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core_siblings_filename, CORE_SIBLINGS_FILENAME_SIZE, CORE_SIBLINGS_FILENAME_FORMAT, processor);
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if ((unsigned int) chars_formatted >= CORE_SIBLINGS_FILENAME_SIZE) {
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cpuinfo_log_warning("failed to format filename for core siblings of processor %"PRIu32, processor);
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return false;
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}
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struct siblings_context siblings_context = {
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.group_name = "package",
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.max_processors_count = max_processors_count,
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.processor = processor,
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.callback = callback,
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.callback_context = context,
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};
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if (cpuinfo_linux_parse_cpulist(core_siblings_filename,
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(cpuinfo_cpulist_callback) siblings_parser, &siblings_context))
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{
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return true;
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} else {
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cpuinfo_log_info("failed to parse the list of core siblings for processor %"PRIu32" from %s",
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processor, core_siblings_filename);
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return false;
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}
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}
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bool cpuinfo_linux_detect_thread_siblings(
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uint32_t max_processors_count,
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uint32_t processor,
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cpuinfo_siblings_callback callback,
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void* context)
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{
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char thread_siblings_filename[THREAD_SIBLINGS_FILENAME_SIZE];
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const int chars_formatted = snprintf(
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thread_siblings_filename, THREAD_SIBLINGS_FILENAME_SIZE, THREAD_SIBLINGS_FILENAME_FORMAT, processor);
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if ((unsigned int) chars_formatted >= THREAD_SIBLINGS_FILENAME_SIZE) {
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cpuinfo_log_warning("failed to format filename for thread siblings of processor %"PRIu32, processor);
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return false;
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}
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struct siblings_context siblings_context = {
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.group_name = "core",
|
||||
.max_processors_count = max_processors_count,
|
||||
.processor = processor,
|
||||
.callback = callback,
|
||||
.callback_context = context,
|
||||
};
|
||||
if (cpuinfo_linux_parse_cpulist(thread_siblings_filename,
|
||||
(cpuinfo_cpulist_callback) siblings_parser, &siblings_context))
|
||||
{
|
||||
return true;
|
||||
} else {
|
||||
cpuinfo_log_info("failed to parse the list of thread siblings for processor %"PRIu32" from %s",
|
||||
processor, thread_siblings_filename);
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user