tools/perf/arch/s390/util/header.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Implementation of get_cpuid().
   4  *
   5  * Copyright IBM Corp. 2014, 2018
   6  * Author(s): Alexander Yarygin <yarygin@linux.vnet.ibm.com>
   7  *            Thomas Richter <tmricht@linux.vnet.ibm.com>
   8  */
   9
  10 #include <sys/types.h>
  11 #include <unistd.h>
  12 #include <stdio.h>
  13 #include <string.h>
  14 #include <linux/ctype.h>
  15 #include <linux/kernel.h>
  16 #include <linux/zalloc.h>
  17
  18 #include "../../util/header.h"
  19
  20 #define SYSINFO_MANU    "Manufacturer:"
  21 #define SYSINFO_TYPE    "Type:"
  22 #define SYSINFO_MODEL   "Model:"
  23 #define SRVLVL_CPUMF    "CPU-MF:"
  24 #define SRVLVL_VERSION  "version="
  25 #define SRVLVL_AUTHORIZATION    "authorization="
  26 #define SYSINFO         "/proc/sysinfo"
  27 #define SRVLVL          "/proc/service_levels"
  28
  29 int get_cpuid(char *buffer, size_t sz)
  30 {
  31         char *cp, *line = NULL, *line2;
  32         char type[8], model[33], version[8], manufacturer[32], authorization[8];
  33         int tpsize = 0, mdsize = 0, vssize = 0, mfsize = 0, atsize = 0;
  34         int read;
  35         unsigned long line_sz;
  36         size_t nbytes;
  37         FILE *sysinfo;
  38
  39         /*
  40          * Scan /proc/sysinfo line by line and read out values for
  41          * Manufacturer:, Type: and Model:, for example:
  42          * Manufacturer:    IBM
  43          * Type:            2964
  44          * Model:           702              N96
  45          * The first word is the Model Capacity and the second word is
  46          * Model (can be omitted). Both words have a maximum size of 16
  47          * bytes.
  48          */
  49         memset(manufacturer, 0, sizeof(manufacturer));
  50         memset(type, 0, sizeof(type));
  51         memset(model, 0, sizeof(model));
  52         memset(version, 0, sizeof(version));
  53         memset(authorization, 0, sizeof(authorization));
  54
  55         sysinfo = fopen(SYSINFO, "r");
  56         if (sysinfo == NULL)
  57                 return -1;
  58
  59         while ((read = getline(&line, &line_sz, sysinfo)) != -1) {
  60                 if (!strncmp(line, SYSINFO_MANU, strlen(SYSINFO_MANU))) {
  61                         line2 = line + strlen(SYSINFO_MANU);
  62
  63                         while ((cp = strtok_r(line2, "\n ", &line2))) {
  64                                 mfsize += scnprintf(manufacturer + mfsize,
  65                                                     sizeof(manufacturer) - mfsize, "%s", cp);
  66                         }
  67                 }
  68
  69                 if (!strncmp(line, SYSINFO_TYPE, strlen(SYSINFO_TYPE))) {
  70                         line2 = line + strlen(SYSINFO_TYPE);
  71
  72                         while ((cp = strtok_r(line2, "\n ", &line2))) {
  73                                 tpsize += scnprintf(type + tpsize,
  74                                                     sizeof(type) - tpsize, "%s", cp);
  75                         }
  76                 }
  77
  78                 if (!strncmp(line, SYSINFO_MODEL, strlen(SYSINFO_MODEL))) {
  79                         line2 = line + strlen(SYSINFO_MODEL);
  80
  81                         while ((cp = strtok_r(line2, "\n ", &line2))) {
  82                                 mdsize += scnprintf(model + mdsize, sizeof(model) - mdsize,
  83                                                     "%s%s", model[0] ? "," : "", cp);
  84                         }
  85                         break;
  86                 }
  87         }
  88         fclose(sysinfo);
  89
  90         /* Missing manufacturer, type or model information should not happen */
  91         if (!manufacturer[0] || !type[0] || !model[0])
  92                 return -1;
  93
  94         /*
  95          * Scan /proc/service_levels and return the CPU-MF counter facility
  96          * version number and authorization level.
  97          * Optional, does not exist on z/VM guests.
  98          */
  99         sysinfo = fopen(SRVLVL, "r");
 100         if (sysinfo == NULL)
 101                 goto skip_sysinfo;
 102         while ((read = getline(&line, &line_sz, sysinfo)) != -1) {
 103                 if (strncmp(line, SRVLVL_CPUMF, strlen(SRVLVL_CPUMF)))
 104                         continue;
 105
 106                 line2 = line + strlen(SRVLVL_CPUMF);
 107                 while ((cp = strtok_r(line2, "\n ", &line2))) {
 108                         if (!strncmp(cp, SRVLVL_VERSION,
 109                                      strlen(SRVLVL_VERSION))) {
 110                                 char *sep = strchr(cp, '=');
 111
 112                                 vssize += scnprintf(version + vssize,
 113                                                     sizeof(version) - vssize, "%s", sep + 1);
 114                         }
 115                         if (!strncmp(cp, SRVLVL_AUTHORIZATION,
 116                                      strlen(SRVLVL_AUTHORIZATION))) {
 117                                 char *sep = strchr(cp, '=');
 118
 119                                 atsize += scnprintf(authorization + atsize,
 120                                                     sizeof(authorization) - atsize, "%s", sep + 1);
 121                         }
 122                 }
 123         }
 124         fclose(sysinfo);
 125
 126 skip_sysinfo:
 127         free(line);
 128
 129         if (version[0] && authorization[0] )
 130                 nbytes = snprintf(buffer, sz, "%s,%s,%s,%s,%s",
 131                                   manufacturer, type, model, version,
 132                                   authorization);
 133         else
 134                 nbytes = snprintf(buffer, sz, "%s,%s,%s", manufacturer, type,
 135                                   model);
 136         return (nbytes >= sz) ? -1 : 0;
 137 }
 138
 139 char *get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
 140 {
 141         char *buf = malloc(128);
 142
 143         if (buf && get_cpuid(buf, 128) < 0)
 144                 zfree(&buf);
 145         return buf;
 146 }