1 #include <string.h>
2 #include <alloca.h>
3 #include <errno.h>
4
5 #include <sys/types.h>
6 #include <sys/sysctl.h>
7
8 #include <cpuinfo/log.h>
9 #include <mach/api.h>
10
11 #include <TargetConditionals.h>
12
13
cpuinfo_mach_detect_topology(void)14 struct cpuinfo_mach_topology cpuinfo_mach_detect_topology(void) {
15 int cores = 1;
16 size_t sizeof_cores = sizeof(cores);
17 if (sysctlbyname("hw.physicalcpu_max", &cores, &sizeof_cores, NULL, 0) != 0) {
18 cpuinfo_log_error("sysctlbyname(\"hw.physicalcpu_max\") failed: %s", strerror(errno));
19 } else if (cores <= 0) {
20 cpuinfo_log_error("sysctlbyname(\"hw.physicalcpu_max\") returned invalid value %d", cores);
21 cores = 1;
22 }
23
24 int threads = 1;
25 size_t sizeof_threads = sizeof(threads);
26 if (sysctlbyname("hw.logicalcpu_max", &threads, &sizeof_threads, NULL, 0) != 0) {
27 cpuinfo_log_error("sysctlbyname(\"hw.logicalcpu_max\") failed: %s", strerror(errno));
28 } else if (threads <= 0) {
29 cpuinfo_log_error("sysctlbyname(\"hw.logicalcpu_max\") returned invalid value %d", threads);
30 threads = cores;
31 }
32
33 int packages = 1;
34 #if !TARGET_OS_IPHONE
35 size_t sizeof_packages = sizeof(packages);
36 if (sysctlbyname("hw.packages", &packages, &sizeof_packages, NULL, 0) != 0) {
37 cpuinfo_log_error("sysctlbyname(\"hw.packages\") failed: %s", strerror(errno));
38 } else if (packages <= 0) {
39 cpuinfo_log_error("sysctlbyname(\"hw.packages\") returned invalid value %d", packages);
40 packages = 1;
41 }
42 #endif
43
44 cpuinfo_log_debug("mach topology: packages = %d, cores = %d, threads = %d", packages, (int) cores, (int) threads);
45 struct cpuinfo_mach_topology topology = {
46 .packages = (uint32_t) packages,
47 .cores = (uint32_t) cores,
48 .threads = (uint32_t) threads
49 };
50
51 #if !TARGET_OS_IPHONE
52 size_t cacheconfig_size = 0;
53 if (sysctlbyname("hw.cacheconfig", NULL, &cacheconfig_size, NULL, 0) != 0) {
54 cpuinfo_log_error("sysctlbyname(\"hw.cacheconfig\") failed: %s", strerror(errno));
55 } else {
56 uint64_t* cacheconfig = alloca(cacheconfig_size);
57 if (sysctlbyname("hw.cacheconfig", cacheconfig, &cacheconfig_size, NULL, 0) != 0) {
58 cpuinfo_log_error("sysctlbyname(\"hw.cacheconfig\") failed: %s", strerror(errno));
59 } else {
60 size_t cache_configs = cacheconfig_size / sizeof(uint64_t);
61 cpuinfo_log_debug("mach hw.cacheconfig count: %zu", cache_configs);
62 if (cache_configs > CPUINFO_MACH_MAX_CACHE_LEVELS) {
63 cache_configs = CPUINFO_MACH_MAX_CACHE_LEVELS;
64 }
65 for (size_t i = 0; i < cache_configs; i++) {
66 cpuinfo_log_debug("mach hw.cacheconfig[%zu]: %"PRIu64, i, cacheconfig[i]);
67 topology.threads_per_cache[i] = cacheconfig[i];
68 }
69 }
70 }
71 #endif
72 return topology;
73 }
74