tools/perf/arch/x86/util/event.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/types.h>
   3 #include <linux/string.h>
   4
   5 #include "../../util/machine.h"
   6 #include "../../util/tool.h"
   7 #include "../../util/map.h"
   8 #include "../../util/util.h"
   9 #include "../../util/debug.h"
  10
  11 #if defined(__x86_64__)
  12
  13 int perf_event__synthesize_extra_kmaps(struct perf_tool *tool,
  14                                        perf_event__handler_t process,
  15                                        struct machine *machine)
  16 {
  17         int rc = 0;
  18         struct map *pos;
  19         struct map_groups *kmaps = &machine->kmaps;
  20         struct maps *maps = &kmaps->maps;
  21         union perf_event *event = zalloc(sizeof(event->mmap) +
  22                                          machine->id_hdr_size);
  23
  24         if (!event) {
  25                 pr_debug("Not enough memory synthesizing mmap event "
  26                          "for extra kernel maps\n");
  27                 return -1;
  28         }
  29
  30         for (pos = maps__first(maps); pos; pos = map__next(pos)) {
  31                 struct kmap *kmap;
  32                 size_t size;
  33
  34                 if (!__map__is_extra_kernel_map(pos))
  35                         continue;
  36
  37                 kmap = map__kmap(pos);
  38
  39                 size = sizeof(event->mmap) - sizeof(event->mmap.filename) +
  40                        PERF_ALIGN(strlen(kmap->name) + 1, sizeof(u64)) +
  41                        machine->id_hdr_size;
  42
  43                 memset(event, 0, size);
  44
  45                 event->mmap.header.type = PERF_RECORD_MMAP;
  46
  47                 /*
  48                  * kernel uses 0 for user space maps, see kernel/perf_event.c
  49                  * __perf_event_mmap
  50                  */
  51                 if (machine__is_host(machine))
  52                         event->header.misc = PERF_RECORD_MISC_KERNEL;
  53                 else
  54                         event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
  55
  56                 event->mmap.header.size = size;
  57
  58                 event->mmap.start = pos->start;
  59                 event->mmap.len   = pos->end - pos->start;
  60                 event->mmap.pgoff = pos->pgoff;
  61                 event->mmap.pid   = machine->pid;
  62
  63                 strlcpy(event->mmap.filename, kmap->name, PATH_MAX);
  64
  65                 if (perf_tool__process_synth_event(tool, event, machine,
  66                                                    process) != 0) {
  67                         rc = -1;
  68                         break;
  69                 }
  70         }
  71
  72         free(event);
  73         return rc;
  74 }
  75
  76 #endif