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https://github.com/stenzek/duckstation.git
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74 lines
2.5 KiB
C
74 lines
2.5 KiB
C
#include <string.h>
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#include <alloca.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#include <cpuinfo/log.h>
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#include <mach/api.h>
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#include <TargetConditionals.h>
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struct cpuinfo_mach_topology cpuinfo_mach_detect_topology(void) {
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int cores = 1;
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size_t sizeof_cores = sizeof(cores);
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if (sysctlbyname("hw.physicalcpu_max", &cores, &sizeof_cores, NULL, 0) != 0) {
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cpuinfo_log_error("sysctlbyname(\"hw.physicalcpu_max\") failed: %s", strerror(errno));
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} else if (cores <= 0) {
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cpuinfo_log_error("sysctlbyname(\"hw.physicalcpu_max\") returned invalid value %d", cores);
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cores = 1;
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}
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int threads = 1;
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size_t sizeof_threads = sizeof(threads);
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if (sysctlbyname("hw.logicalcpu_max", &threads, &sizeof_threads, NULL, 0) != 0) {
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cpuinfo_log_error("sysctlbyname(\"hw.logicalcpu_max\") failed: %s", strerror(errno));
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} else if (threads <= 0) {
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cpuinfo_log_error("sysctlbyname(\"hw.logicalcpu_max\") returned invalid value %d", threads);
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threads = cores;
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}
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int packages = 1;
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#if !TARGET_OS_IPHONE
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size_t sizeof_packages = sizeof(packages);
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if (sysctlbyname("hw.packages", &packages, &sizeof_packages, NULL, 0) != 0) {
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cpuinfo_log_error("sysctlbyname(\"hw.packages\") failed: %s", strerror(errno));
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} else if (packages <= 0) {
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cpuinfo_log_error("sysctlbyname(\"hw.packages\") returned invalid value %d", packages);
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packages = 1;
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}
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#endif
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cpuinfo_log_debug("mach topology: packages = %d, cores = %d, threads = %d", packages, (int) cores, (int) threads);
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struct cpuinfo_mach_topology topology = {
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.packages = (uint32_t) packages,
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.cores = (uint32_t) cores,
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.threads = (uint32_t) threads
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};
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#if !TARGET_OS_IPHONE
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size_t cacheconfig_size = 0;
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if (sysctlbyname("hw.cacheconfig", NULL, &cacheconfig_size, NULL, 0) != 0) {
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cpuinfo_log_error("sysctlbyname(\"hw.cacheconfig\") failed: %s", strerror(errno));
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} else {
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uint64_t* cacheconfig = alloca(cacheconfig_size);
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if (sysctlbyname("hw.cacheconfig", cacheconfig, &cacheconfig_size, NULL, 0) != 0) {
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cpuinfo_log_error("sysctlbyname(\"hw.cacheconfig\") failed: %s", strerror(errno));
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} else {
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size_t cache_configs = cacheconfig_size / sizeof(uint64_t);
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cpuinfo_log_debug("mach hw.cacheconfig count: %zu", cache_configs);
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if (cache_configs > CPUINFO_MACH_MAX_CACHE_LEVELS) {
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cache_configs = CPUINFO_MACH_MAX_CACHE_LEVELS;
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}
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for (size_t i = 0; i < cache_configs; i++) {
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cpuinfo_log_debug("mach hw.cacheconfig[%zu]: %"PRIu64, i, cacheconfig[i]);
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topology.threads_per_cache[i] = cacheconfig[i];
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}
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}
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}
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#endif
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return topology;
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}
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