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b57df288 GK |
1 | #include <stdio.h> |
2 | #include <stdlib.h> | |
3 | #include <api/fs/fs.h> | |
4 | #include "header.h" | |
5 | ||
6 | #define MIDR "/regs/identification/midr_el1" | |
7 | #define MIDR_SIZE 19 | |
8 | #define MIDR_REVISION_MASK 0xf | |
9 | #define MIDR_VARIANT_SHIFT 20 | |
10 | #define MIDR_VARIANT_MASK (0xf << MIDR_VARIANT_SHIFT) | |
11 | ||
12 | char *get_cpuid_str(struct perf_pmu *pmu) | |
13 | { | |
14 | char *buf = NULL; | |
15 | char path[PATH_MAX]; | |
16 | const char *sysfs = sysfs__mountpoint(); | |
17 | int cpu; | |
18 | u64 midr = 0; | |
f854839b | 19 | struct perf_cpu_map *cpus; |
b57df288 GK |
20 | FILE *file; |
21 | ||
22 | if (!sysfs || !pmu || !pmu->cpus) | |
23 | return NULL; | |
24 | ||
25 | buf = malloc(MIDR_SIZE); | |
26 | if (!buf) | |
27 | return NULL; | |
28 | ||
29 | /* read midr from list of cpus mapped to this pmu */ | |
38f01d8d | 30 | cpus = perf_cpu_map__get(pmu->cpus); |
b57df288 GK |
31 | for (cpu = 0; cpu < cpus->nr; cpu++) { |
32 | scnprintf(path, PATH_MAX, "%s/devices/system/cpu/cpu%d"MIDR, | |
33 | sysfs, cpus->map[cpu]); | |
34 | ||
35 | file = fopen(path, "r"); | |
36 | if (!file) { | |
37 | pr_debug("fopen failed for file %s\n", path); | |
38 | continue; | |
39 | } | |
40 | ||
41 | if (!fgets(buf, MIDR_SIZE, file)) { | |
42 | fclose(file); | |
43 | continue; | |
44 | } | |
45 | fclose(file); | |
46 | ||
47 | /* Ignore/clear Variant[23:20] and | |
48 | * Revision[3:0] of MIDR | |
49 | */ | |
50 | midr = strtoul(buf, NULL, 16); | |
51 | midr &= (~(MIDR_VARIANT_MASK | MIDR_REVISION_MASK)); | |
52 | scnprintf(buf, MIDR_SIZE, "0x%016lx", midr); | |
53 | /* got midr break loop */ | |
54 | break; | |
55 | } | |
56 | ||
57 | if (!midr) { | |
58 | pr_err("failed to get cpuid string for PMU %s\n", pmu->name); | |
59 | free(buf); | |
60 | buf = NULL; | |
61 | } | |
62 | ||
38f01d8d | 63 | perf_cpu_map__put(cpus); |
b57df288 GK |
64 | return buf; |
65 | } |