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1 | /* | |
2 | * (C) 2010,2011 Thomas Renninger <trenn@suse.de>, Novell Inc. | |
3 | * | |
4 | * Licensed under the terms of the GNU GPL License version 2. | |
5 | * | |
6 | * ToDo: Needs to be done more properly for AMD/Intel specifics | |
7 | */ | |
8 | ||
9 | /* Helper struct for qsort, must be in sync with cpupower_topology.cpu_info */ | |
10 | /* Be careful: Need to pass unsigned to the sort, so that offlined cores are | |
11 | in the end, but double check for -1 for offlined cpus at other places */ | |
12 | ||
13 | #include <stdlib.h> | |
14 | #include <stdio.h> | |
15 | #include <unistd.h> | |
16 | #include <errno.h> | |
17 | #include <fcntl.h> | |
18 | ||
19 | #include <helpers/helpers.h> | |
20 | #include <helpers/sysfs.h> | |
21 | ||
22 | /* returns -1 on failure, 0 on success */ | |
23 | static int sysfs_topology_read_file(unsigned int cpu, const char *fname, int *result) | |
24 | { | |
25 | char linebuf[MAX_LINE_LEN]; | |
26 | char *endp; | |
27 | char path[SYSFS_PATH_MAX]; | |
28 | ||
29 | snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/topology/%s", | |
30 | cpu, fname); | |
31 | if (sysfs_read_file(path, linebuf, MAX_LINE_LEN) == 0) | |
32 | return -1; | |
33 | *result = strtol(linebuf, &endp, 0); | |
34 | if (endp == linebuf || errno == ERANGE) | |
35 | return -1; | |
36 | return 0; | |
37 | } | |
38 | ||
39 | static int __compare(const void *t1, const void *t2) | |
40 | { | |
41 | struct cpuid_core_info *top1 = (struct cpuid_core_info *)t1; | |
42 | struct cpuid_core_info *top2 = (struct cpuid_core_info *)t2; | |
43 | if (top1->pkg < top2->pkg) | |
44 | return -1; | |
45 | else if (top1->pkg > top2->pkg) | |
46 | return 1; | |
47 | else if (top1->core < top2->core) | |
48 | return -1; | |
49 | else if (top1->core > top2->core) | |
50 | return 1; | |
51 | else if (top1->cpu < top2->cpu) | |
52 | return -1; | |
53 | else if (top1->cpu > top2->cpu) | |
54 | return 1; | |
55 | else | |
56 | return 0; | |
57 | } | |
58 | ||
59 | /* | |
60 | * Returns amount of cpus, negative on error, cpu_top must be | |
61 | * passed to cpu_topology_release to free resources | |
62 | * | |
63 | * Array is sorted after ->pkg, ->core, then ->cpu | |
64 | */ | |
65 | int get_cpu_topology(struct cpupower_topology *cpu_top) | |
66 | { | |
67 | int cpu, last_pkg, cpus = sysconf(_SC_NPROCESSORS_CONF); | |
68 | ||
69 | cpu_top->core_info = malloc(sizeof(struct cpuid_core_info) * cpus); | |
70 | if (cpu_top->core_info == NULL) | |
71 | return -ENOMEM; | |
72 | cpu_top->pkgs = cpu_top->cores = 0; | |
73 | for (cpu = 0; cpu < cpus; cpu++) { | |
74 | cpu_top->core_info[cpu].cpu = cpu; | |
75 | cpu_top->core_info[cpu].is_online = sysfs_is_cpu_online(cpu); | |
76 | if(sysfs_topology_read_file( | |
77 | cpu, | |
78 | "physical_package_id", | |
79 | &(cpu_top->core_info[cpu].pkg)) < 0) { | |
80 | cpu_top->core_info[cpu].pkg = -1; | |
81 | cpu_top->core_info[cpu].core = -1; | |
82 | continue; | |
83 | } | |
84 | if(sysfs_topology_read_file( | |
85 | cpu, | |
86 | "core_id", | |
87 | &(cpu_top->core_info[cpu].core)) < 0) { | |
88 | cpu_top->core_info[cpu].pkg = -1; | |
89 | cpu_top->core_info[cpu].core = -1; | |
90 | continue; | |
91 | } | |
92 | } | |
93 | ||
94 | qsort(cpu_top->core_info, cpus, sizeof(struct cpuid_core_info), | |
95 | __compare); | |
96 | ||
97 | /* Count the number of distinct pkgs values. This works | |
98 | because the primary sort of the core_info struct was just | |
99 | done by pkg value. */ | |
100 | last_pkg = cpu_top->core_info[0].pkg; | |
101 | for(cpu = 1; cpu < cpus; cpu++) { | |
102 | if (cpu_top->core_info[cpu].pkg != last_pkg && | |
103 | cpu_top->core_info[cpu].pkg != -1) { | |
104 | ||
105 | last_pkg = cpu_top->core_info[cpu].pkg; | |
106 | cpu_top->pkgs++; | |
107 | } | |
108 | } | |
109 | if (!cpu_top->core_info[0].pkg == -1) | |
110 | cpu_top->pkgs++; | |
111 | ||
112 | /* Intel's cores count is not consecutively numbered, there may | |
113 | * be a core_id of 3, but none of 2. Assume there always is 0 | |
114 | * Get amount of cores by counting duplicates in a package | |
115 | for (cpu = 0; cpu_top->core_info[cpu].pkg = 0 && cpu < cpus; cpu++) { | |
116 | if (cpu_top->core_info[cpu].core == 0) | |
117 | cpu_top->cores++; | |
118 | */ | |
119 | return cpus; | |
120 | } | |
121 | ||
122 | void cpu_topology_release(struct cpupower_topology cpu_top) | |
123 | { | |
124 | free(cpu_top.core_info); | |
125 | } |