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b57df288 GK |
1 | #include <stdio.h> |
2 | #include <stdlib.h> | |
87ffb6c6 ACM |
3 | #include <perf/cpumap.h> |
4 | #include <internal/cpumap.h> | |
b57df288 | 5 | #include <api/fs/fs.h> |
45a2c0cc | 6 | #include "debug.h" |
b57df288 GK |
7 | #include "header.h" |
8 | ||
9 | #define MIDR "/regs/identification/midr_el1" | |
10 | #define MIDR_SIZE 19 | |
11 | #define MIDR_REVISION_MASK 0xf | |
12 | #define MIDR_VARIANT_SHIFT 20 | |
13 | #define MIDR_VARIANT_MASK (0xf << MIDR_VARIANT_SHIFT) | |
14 | ||
15 | char *get_cpuid_str(struct perf_pmu *pmu) | |
16 | { | |
17 | char *buf = NULL; | |
18 | char path[PATH_MAX]; | |
19 | const char *sysfs = sysfs__mountpoint(); | |
20 | int cpu; | |
21 | u64 midr = 0; | |
f854839b | 22 | struct perf_cpu_map *cpus; |
b57df288 GK |
23 | FILE *file; |
24 | ||
25 | if (!sysfs || !pmu || !pmu->cpus) | |
26 | return NULL; | |
27 | ||
28 | buf = malloc(MIDR_SIZE); | |
29 | if (!buf) | |
30 | return NULL; | |
31 | ||
32 | /* read midr from list of cpus mapped to this pmu */ | |
38f01d8d | 33 | cpus = perf_cpu_map__get(pmu->cpus); |
87ffb6c6 | 34 | for (cpu = 0; cpu < perf_cpu_map__nr(cpus); cpu++) { |
b57df288 GK |
35 | scnprintf(path, PATH_MAX, "%s/devices/system/cpu/cpu%d"MIDR, |
36 | sysfs, cpus->map[cpu]); | |
37 | ||
38 | file = fopen(path, "r"); | |
39 | if (!file) { | |
40 | pr_debug("fopen failed for file %s\n", path); | |
41 | continue; | |
42 | } | |
43 | ||
44 | if (!fgets(buf, MIDR_SIZE, file)) { | |
45 | fclose(file); | |
46 | continue; | |
47 | } | |
48 | fclose(file); | |
49 | ||
50 | /* Ignore/clear Variant[23:20] and | |
51 | * Revision[3:0] of MIDR | |
52 | */ | |
53 | midr = strtoul(buf, NULL, 16); | |
54 | midr &= (~(MIDR_VARIANT_MASK | MIDR_REVISION_MASK)); | |
55 | scnprintf(buf, MIDR_SIZE, "0x%016lx", midr); | |
56 | /* got midr break loop */ | |
57 | break; | |
58 | } | |
59 | ||
60 | if (!midr) { | |
61 | pr_err("failed to get cpuid string for PMU %s\n", pmu->name); | |
62 | free(buf); | |
63 | buf = NULL; | |
64 | } | |
65 | ||
38f01d8d | 66 | perf_cpu_map__put(cpus); |
b57df288 GK |
67 | return buf; |
68 | } |