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