| // SPDX-License-Identifier: GPL-2.0 |
| #include <sys/types.h> |
| #include <unistd.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <regex.h> |
| |
| #include "../../util/header.h" |
| |
| static inline void |
| cpuid(unsigned int op, unsigned int *a, unsigned int *b, unsigned int *c, |
| unsigned int *d) |
| { |
| __asm__ __volatile__ (".byte 0x53\n\tcpuid\n\t" |
| "movl %%ebx, %%esi\n\t.byte 0x5b" |
| : "=a" (*a), |
| "=S" (*b), |
| "=c" (*c), |
| "=d" (*d) |
| : "a" (op)); |
| } |
| |
| 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]; |
| |
| cpuid(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'; |
| |
| if (lvl >= 1) { |
| cpuid(1, &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, '$')) { |
| buffer[nb-1] = '\0'; |
| return 0; |
| } |
| return -1; |
| } |
| |
| int |
| get_cpuid(char *buffer, size_t sz) |
| { |
| return __get_cpuid(buffer, sz, "%s,%u,%u,%u$"); |
| } |
| |
| 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; |
| } |