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

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <sys/types.h>
   3 #include <errno.h>
   4 #include <unistd.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <linux/stringify.h>
   9 #include "header.h"
  10 #include "util.h"
  11
  12 #define mfspr(rn)       ({unsigned long rval; \
  13                          asm volatile("mfspr %0," __stringify(rn) \
  14                                       : "=r" (rval)); rval; })
  15
  16 #define SPRN_PVR        0x11F   /* Processor Version Register */
  17 #define PVR_VER(pvr)    (((pvr) >>  16) & 0xFFFF) /* Version field */
  18 #define PVR_REV(pvr)    (((pvr) >>   0) & 0xFFFF) /* Revison field */
  19
  20 int
  21 get_cpuid(char *buffer, size_t sz)
  22 {
  23         unsigned long pvr;
  24         int nb;
  25
  26         pvr = mfspr(SPRN_PVR);
  27
  28         nb = scnprintf(buffer, sz, "%lu,%lu$", PVR_VER(pvr), PVR_REV(pvr));
  29
  30         /* look for end marker to ensure the entire data fit */
  31         if (strchr(buffer, '$')) {
  32                 buffer[nb-1] = '\0';
  33                 return 0;
  34         }
  35         return ENOBUFS;
  36 }
  37
  38 char *
  39 get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
  40 {
  41         char *bufp;
  42
  43         if (asprintf(&bufp, "%.8lx", mfspr(SPRN_PVR)) < 0)
  44                 bufp = NULL;
  45
  46         return bufp;
  47 }