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// SPDX-License-Identifier: GPL-2.0-only
/*
* Implementation of get_cpuid().
*
* Copyright IBM Corp. 2014, 2018
* Author(s): Alexander Yarygin <yarygin@linux.vnet.ibm.com>
* Thomas Richter <tmricht@linux.vnet.ibm.com>
*/
#include <sys/types.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <linux/ctype.h>
#include <linux/kernel.h>
#include <linux/zalloc.h>
#include "../../util/header.h"
#define SYSINFO_MANU "Manufacturer:"
#define SYSINFO_TYPE "Type:"
#define SYSINFO_MODEL "Model:"
#define SRVLVL_CPUMF "CPU-MF:"
#define SRVLVL_VERSION "version="
#define SRVLVL_AUTHORIZATION "authorization="
#define SYSINFO "/proc/sysinfo"
#define SRVLVL "/proc/service_levels"
int get_cpuid(char *buffer, size_t sz)
{
char *cp, *line = NULL, *line2;
char type[8], model[33], version[8], manufacturer[32], authorization[8];
int tpsize = 0, mdsize = 0, vssize = 0, mfsize = 0, atsize = 0;
int read;
unsigned long line_sz;
size_t nbytes;
FILE *sysinfo;
/*
* Scan /proc/sysinfo line by line and read out values for
* Manufacturer:, Type: and Model:, for example:
* Manufacturer: IBM
* Type: 2964
* Model: 702 N96
* The first word is the Model Capacity and the second word is
* Model (can be omitted). Both words have a maximum size of 16
* bytes.
*/
memset(manufacturer, 0, sizeof(manufacturer));
memset(type, 0, sizeof(type));
memset(model, 0, sizeof(model));
memset(version, 0, sizeof(version));
memset(authorization, 0, sizeof(authorization));
sysinfo = fopen(SYSINFO, "r");
if (sysinfo == NULL)
return errno;
while ((read = getline(&line, &line_sz, sysinfo)) != -1) {
if (!strncmp(line, SYSINFO_MANU, strlen(SYSINFO_MANU))) {
line2 = line + strlen(SYSINFO_MANU);
while ((cp = strtok_r(line2, "\n ", &line2))) {
mfsize += scnprintf(manufacturer + mfsize,
sizeof(manufacturer) - mfsize, "%s", cp);
}
}
if (!strncmp(line, SYSINFO_TYPE, strlen(SYSINFO_TYPE))) {
line2 = line + strlen(SYSINFO_TYPE);
while ((cp = strtok_r(line2, "\n ", &line2))) {
tpsize += scnprintf(type + tpsize,
sizeof(type) - tpsize, "%s", cp);
}
}
if (!strncmp(line, SYSINFO_MODEL, strlen(SYSINFO_MODEL))) {
line2 = line + strlen(SYSINFO_MODEL);
while ((cp = strtok_r(line2, "\n ", &line2))) {
mdsize += scnprintf(model + mdsize, sizeof(model) - mdsize,
"%s%s", model[0] ? "," : "", cp);
}
break;
}
}
fclose(sysinfo);
/* Missing manufacturer, type or model information should not happen */
if (!manufacturer[0] || !type[0] || !model[0])
return EINVAL;
/*
* Scan /proc/service_levels and return the CPU-MF counter facility
* version number and authorization level.
* Optional, does not exist on z/VM guests.
*/
sysinfo = fopen(SRVLVL, "r");
if (sysinfo == NULL)
goto skip_sysinfo;
while ((read = getline(&line, &line_sz, sysinfo)) != -1) {
if (strncmp(line, SRVLVL_CPUMF, strlen(SRVLVL_CPUMF)))
continue;
line2 = line + strlen(SRVLVL_CPUMF);
while ((cp = strtok_r(line2, "\n ", &line2))) {
if (!strncmp(cp, SRVLVL_VERSION,
strlen(SRVLVL_VERSION))) {
char *sep = strchr(cp, '=');
vssize += scnprintf(version + vssize,
sizeof(version) - vssize, "%s", sep + 1);
}
if (!strncmp(cp, SRVLVL_AUTHORIZATION,
strlen(SRVLVL_AUTHORIZATION))) {
char *sep = strchr(cp, '=');
atsize += scnprintf(authorization + atsize,
sizeof(authorization) - atsize, "%s", sep + 1);
}
}
}
fclose(sysinfo);
skip_sysinfo:
free(line);
if (version[0] && authorization[0] )
nbytes = snprintf(buffer, sz, "%s,%s,%s,%s,%s",
manufacturer, type, model, version,
authorization);
else
nbytes = snprintf(buffer, sz, "%s,%s,%s", manufacturer, type,
model);
return (nbytes >= sz) ? ENOBUFS : 0;
}
char *get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
{
char *buf = malloc(128);
if (buf && get_cpuid(buf, 128))
zfree(&buf);
return buf;
}
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