tools/perf/util/topdown.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <stdio.h>
   3 #include "pmu.h"
   4 #include "topdown.h"
   5
   6 int topdown_filter_events(const char **attr, char **str, bool use_group)
   7 {
   8         int off = 0;
   9         int i;
  10         int len = 0;
  11         char *s;
  12
  13         for (i = 0; attr[i]; i++) {
  14                 if (pmu_have_event("cpu", attr[i])) {
  15                         len += strlen(attr[i]) + 1;
  16                         attr[i - off] = attr[i];
  17                 } else
  18                         off++;
  19         }
  20         attr[i - off] = NULL;
  21
  22         *str = malloc(len + 1 + 2);
  23         if (!*str)
  24                 return -1;
  25         s = *str;
  26         if (i - off == 0) {
  27                 *s = 0;
  28                 return 0;
  29         }
  30         if (use_group)
  31                 *s++ = '{';
  32         for (i = 0; attr[i]; i++) {
  33                 strcpy(s, attr[i]);
  34                 s += strlen(s);
  35                 *s++ = ',';
  36         }
  37         if (use_group) {
  38                 s[-1] = '}';
  39                 *s = 0;
  40         } else
  41                 s[-1] = 0;
  42         return 0;
  43 }
  44
  45 __weak bool arch_topdown_check_group(bool *warn)
  46 {
  47         *warn = false;
  48         return false;
  49 }
  50
  51 __weak void arch_topdown_group_warn(void)
  52 {
  53 }
  54
  55 __weak bool arch_topdown_sample_read(struct evsel *leader __maybe_unused)
  56 {
  57         return false;
  58 }