1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/list.h>
3 #include <linux/compiler.h>
4 #include <linux/string.h>
5 #include <linux/zalloc.h>
6 #include <sys/types.h>
7 #include <errno.h>
8 #include <fcntl.h>
9 #include <sys/stat.h>
10 #include <unistd.h>
11 #include <stdio.h>
12 #include <stdbool.h>
13 #include <stdarg.h>
14 #include <locale.h>
15 #include <api/fs/fs.h>
16 #include "fncache.h"
17 #include "pmu-hybrid.h"
18
19 LIST_HEAD(perf_pmu__hybrid_pmus);
20
perf_pmu__hybrid_mounted(const char * name)21 bool perf_pmu__hybrid_mounted(const char *name)
22 {
23 char path[PATH_MAX];
24 const char *sysfs;
25 FILE *file;
26 int n, cpu;
27
28 if (strncmp(name, "cpu_", 4))
29 return false;
30
31 sysfs = sysfs__mountpoint();
32 if (!sysfs)
33 return false;
34
35 snprintf(path, PATH_MAX, CPUS_TEMPLATE_CPU, sysfs, name);
36 if (!file_available(path))
37 return false;
38
39 file = fopen(path, "r");
40 if (!file)
41 return false;
42
43 n = fscanf(file, "%u", &cpu);
44 fclose(file);
45 if (n <= 0)
46 return false;
47
48 return true;
49 }
50
perf_pmu__find_hybrid_pmu(const char * name)51 struct perf_pmu *perf_pmu__find_hybrid_pmu(const char *name)
52 {
53 struct perf_pmu *pmu;
54
55 if (!name)
56 return NULL;
57
58 perf_pmu__for_each_hybrid_pmu(pmu) {
59 if (!strcmp(name, pmu->name))
60 return pmu;
61 }
62
63 return NULL;
64 }
65
perf_pmu__is_hybrid(const char * name)66 bool perf_pmu__is_hybrid(const char *name)
67 {
68 return perf_pmu__find_hybrid_pmu(name) != NULL;
69 }
70
perf_pmu__hybrid_type_to_pmu(const char * type)71 char *perf_pmu__hybrid_type_to_pmu(const char *type)
72 {
73 char *pmu_name = NULL;
74
75 if (asprintf(&pmu_name, "cpu_%s", type) < 0)
76 return NULL;
77
78 if (perf_pmu__is_hybrid(pmu_name))
79 return pmu_name;
80
81 /*
82 * pmu may be not scanned, check the sysfs.
83 */
84 if (perf_pmu__hybrid_mounted(pmu_name))
85 return pmu_name;
86
87 free(pmu_name);
88 return NULL;
89 }
90