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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Implementation of get_cpuid().4 *5 * Copyright IBM Corp. 2014, 20186 * 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 <errno.h>12#include <unistd.h>13#include <stdio.h>14#include <string.h>15#include <linux/ctype.h>16#include <linux/kernel.h>17#include <linux/zalloc.h>18 19#include "../../util/header.h"20 21#define SYSINFO_MANU "Manufacturer:"22#define SYSINFO_TYPE "Type:"23#define SYSINFO_MODEL "Model:"24#define SRVLVL_CPUMF "CPU-MF:"25#define SRVLVL_VERSION "version="26#define SRVLVL_AUTHORIZATION "authorization="27#define SYSINFO "/proc/sysinfo"28#define SRVLVL "/proc/service_levels"29 30int get_cpuid(char *buffer, size_t sz)31{32 char *cp, *line = NULL, *line2;33 char type[8], model[33], version[8], manufacturer[32], authorization[8];34 int tpsize = 0, mdsize = 0, vssize = 0, mfsize = 0, atsize = 0;35 int read;36 unsigned long line_sz;37 size_t nbytes;38 FILE *sysinfo;39 40 /*41 * Scan /proc/sysinfo line by line and read out values for42 * Manufacturer:, Type: and Model:, for example:43 * Manufacturer: IBM44 * Type: 296445 * Model: 702 N9646 * The first word is the Model Capacity and the second word is47 * Model (can be omitted). Both words have a maximum size of 1648 * bytes.49 */50 memset(manufacturer, 0, sizeof(manufacturer));51 memset(type, 0, sizeof(type));52 memset(model, 0, sizeof(model));53 memset(version, 0, sizeof(version));54 memset(authorization, 0, sizeof(authorization));55 56 sysinfo = fopen(SYSINFO, "r");57 if (sysinfo == NULL)58 return errno;59 60 while ((read = getline(&line, &line_sz, sysinfo)) != -1) {61 if (!strncmp(line, SYSINFO_MANU, strlen(SYSINFO_MANU))) {62 line2 = line + strlen(SYSINFO_MANU);63 64 while ((cp = strtok_r(line2, "\n ", &line2))) {65 mfsize += scnprintf(manufacturer + mfsize,66 sizeof(manufacturer) - mfsize, "%s", cp);67 }68 }69 70 if (!strncmp(line, SYSINFO_TYPE, strlen(SYSINFO_TYPE))) {71 line2 = line + strlen(SYSINFO_TYPE);72 73 while ((cp = strtok_r(line2, "\n ", &line2))) {74 tpsize += scnprintf(type + tpsize,75 sizeof(type) - tpsize, "%s", cp);76 }77 }78 79 if (!strncmp(line, SYSINFO_MODEL, strlen(SYSINFO_MODEL))) {80 line2 = line + strlen(SYSINFO_MODEL);81 82 while ((cp = strtok_r(line2, "\n ", &line2))) {83 mdsize += scnprintf(model + mdsize, sizeof(model) - mdsize,84 "%s%s", model[0] ? "," : "", cp);85 }86 break;87 }88 }89 fclose(sysinfo);90 91 /* Missing manufacturer, type or model information should not happen */92 if (!manufacturer[0] || !type[0] || !model[0])93 return EINVAL;94 95 /*96 * Scan /proc/service_levels and return the CPU-MF counter facility97 * version number and authorization level.98 * Optional, does not exist on z/VM guests.99 */100 sysinfo = fopen(SRVLVL, "r");101 if (sysinfo == NULL)102 goto skip_sysinfo;103 while ((read = getline(&line, &line_sz, sysinfo)) != -1) {104 if (strncmp(line, SRVLVL_CPUMF, strlen(SRVLVL_CPUMF)))105 continue;106 107 line2 = line + strlen(SRVLVL_CPUMF);108 while ((cp = strtok_r(line2, "\n ", &line2))) {109 if (!strncmp(cp, SRVLVL_VERSION,110 strlen(SRVLVL_VERSION))) {111 char *sep = strchr(cp, '=');112 113 vssize += scnprintf(version + vssize,114 sizeof(version) - vssize, "%s", sep + 1);115 }116 if (!strncmp(cp, SRVLVL_AUTHORIZATION,117 strlen(SRVLVL_AUTHORIZATION))) {118 char *sep = strchr(cp, '=');119 120 atsize += scnprintf(authorization + atsize,121 sizeof(authorization) - atsize, "%s", sep + 1);122 }123 }124 }125 fclose(sysinfo);126 127skip_sysinfo:128 free(line);129 130 if (version[0] && authorization[0] )131 nbytes = snprintf(buffer, sz, "%s,%s,%s,%s,%s",132 manufacturer, type, model, version,133 authorization);134 else135 nbytes = snprintf(buffer, sz, "%s,%s,%s", manufacturer, type,136 model);137 return (nbytes >= sz) ? ENOBUFS : 0;138}139 140char *get_cpuid_str(struct perf_pmu *pmu __maybe_unused)141{142 char *buf = malloc(128);143 144 if (buf && get_cpuid(buf, 128))145 zfree(&buf);146 return buf;147}148