LXR linux/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/machine.h"
   7#include "../../util/tool.h"
   8#include "../../util/map.h"
   9#include "../../util/debug.h"
  10
  11#if defined(__x86_64__)
  12
  13int 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
  77