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