tools/perf/arch/powerpc/util/header.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <sys/types.h>
   3 #include <unistd.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <linux/stringify.h>
   8 #include "header.h"
   9 #include "util.h"
  10
  11 #define mfspr(rn)       ({unsigned long rval; \
  12                          asm volatile("mfspr %0," __stringify(rn) \
  13                                       : "=r" (rval)); rval; })
  14
  15 #define SPRN_PVR        0x11F   /* Processor Version Register */
  16 #define PVR_VER(pvr)    (((pvr) >>  16) & 0xFFFF) /* Version field */
  17 #define PVR_REV(pvr)    (((pvr) >>   0) & 0xFFFF) /* Revison field */
  18
  19 int
  20 get_cpuid(char *buffer, size_t sz)
  21 {
  22         unsigned long pvr;
  23         int nb;
  24
  25         pvr = mfspr(SPRN_PVR);
  26
  27         nb = scnprintf(buffer, sz, "%lu,%lu$", PVR_VER(pvr), PVR_REV(pvr));
  28
  29         /* look for end marker to ensure the entire data fit */
  30         if (strchr(buffer, '$')) {
  31                 buffer[nb-1] = '\0';
  32                 return 0;
  33         }
  34         return -1;
  35 }
  36
  37 char *
  38 get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
  39 {
  40         char *bufp;
  41
  42         if (asprintf(&bufp, "%.8lx", mfspr(SPRN_PVR)) < 0)
  43                 bufp = NULL;
  44
  45         return bufp;
  46 }