140 lines
2.8 KiB
C
140 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <sys/types.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <regex.h>
|
|
|
|
#include "../../../util/debug.h"
|
|
#include "../../../util/header.h"
|
|
#include "cpuid.h"
|
|
|
|
void get_cpuid_0(char *vendor, unsigned int *lvl)
|
|
{
|
|
unsigned int b, c, d;
|
|
|
|
cpuid(0, 0, lvl, &b, &c, &d);
|
|
strncpy(&vendor[0], (char *)(&b), 4);
|
|
strncpy(&vendor[4], (char *)(&d), 4);
|
|
strncpy(&vendor[8], (char *)(&c), 4);
|
|
vendor[12] = '\0';
|
|
}
|
|
|
|
static int
|
|
__get_cpuid(char *buffer, size_t sz, const char *fmt)
|
|
{
|
|
unsigned int a, b, c, d, lvl;
|
|
int family = -1, model = -1, step = -1;
|
|
int nb;
|
|
char vendor[16];
|
|
|
|
get_cpuid_0(vendor, &lvl);
|
|
|
|
if (lvl >= 1) {
|
|
cpuid(1, 0, &a, &b, &c, &d);
|
|
|
|
family = (a >> 8) & 0xf; /* bits 11 - 8 */
|
|
model = (a >> 4) & 0xf; /* Bits 7 - 4 */
|
|
step = a & 0xf;
|
|
|
|
/* extended family */
|
|
if (family == 0xf)
|
|
family += (a >> 20) & 0xff;
|
|
|
|
/* extended model */
|
|
if (family >= 0x6)
|
|
model += ((a >> 16) & 0xf) << 4;
|
|
}
|
|
nb = scnprintf(buffer, sz, fmt, vendor, family, model, step);
|
|
|
|
/* look for end marker to ensure the entire data fit */
|
|
if (strchr(buffer, '$')) {
|
|
buffer[nb-1] = '\0';
|
|
return 0;
|
|
}
|
|
return ENOBUFS;
|
|
}
|
|
|
|
int
|
|
get_cpuid(char *buffer, size_t sz)
|
|
{
|
|
return __get_cpuid(buffer, sz, "%s,%u,%u,%u$");
|
|
}
|
|
|
|
char *
|
|
get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
|
|
{
|
|
char *buf = malloc(128);
|
|
|
|
if (buf && __get_cpuid(buf, 128, "%s-%u-%X-%X$") < 0) {
|
|
free(buf);
|
|
return NULL;
|
|
}
|
|
return buf;
|
|
}
|
|
|
|
/* Full CPUID format for x86 is vendor-family-model-stepping */
|
|
static bool is_full_cpuid(const char *id)
|
|
{
|
|
const char *tmp = id;
|
|
int count = 0;
|
|
|
|
while ((tmp = strchr(tmp, '-')) != NULL) {
|
|
count++;
|
|
tmp++;
|
|
}
|
|
|
|
if (count == 3)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
int strcmp_cpuid_str(const char *mapcpuid, const char *id)
|
|
{
|
|
regex_t re;
|
|
regmatch_t pmatch[1];
|
|
int match;
|
|
bool full_mapcpuid = is_full_cpuid(mapcpuid);
|
|
bool full_cpuid = is_full_cpuid(id);
|
|
|
|
/*
|
|
* Full CPUID format is required to identify a platform.
|
|
* Error out if the cpuid string is incomplete.
|
|
*/
|
|
if (full_mapcpuid && !full_cpuid) {
|
|
pr_info("Invalid CPUID %s. Full CPUID is required, "
|
|
"vendor-family-model-stepping\n", id);
|
|
return 1;
|
|
}
|
|
|
|
if (regcomp(&re, mapcpuid, REG_EXTENDED) != 0) {
|
|
/* Warn unable to generate match particular string. */
|
|
pr_info("Invalid regular expression %s\n", mapcpuid);
|
|
return 1;
|
|
}
|
|
|
|
match = !regexec(&re, id, 1, pmatch, 0);
|
|
regfree(&re);
|
|
if (match) {
|
|
size_t match_len = (pmatch[0].rm_eo - pmatch[0].rm_so);
|
|
size_t cpuid_len;
|
|
|
|
/* If the full CPUID format isn't required,
|
|
* ignoring the stepping.
|
|
*/
|
|
if (!full_mapcpuid && full_cpuid)
|
|
cpuid_len = strrchr(id, '-') - id;
|
|
else
|
|
cpuid_len = strlen(id);
|
|
|
|
/* Verify the entire string matched. */
|
|
if (match_len == cpuid_len)
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|