1// SPDX-License-Identifier: GPL-2.0
2#include <linux/types.h>
3#include <linux/string.h>
4#include <linux/zalloc.h>
5#include <stdlib.h>
6
7#include "../../../util/event.h"
8#include "../../../util/synthetic-events.h"
9#include "../../../util/machine.h"
10#include "../../../util/tool.h"
11#include "../../../util/map.h"
12#include "../../../util/debug.h"
13#include "util/sample.h"
14
15#if defined(__x86_64__)
16
17struct perf_event__synthesize_extra_kmaps_cb_args {
18 const struct perf_tool *tool;
19 perf_event__handler_t process;
20 struct machine *machine;
21 union perf_event *event;
22};
23
24static int perf_event__synthesize_extra_kmaps_cb(struct map *map, void *data)
25{
26 struct perf_event__synthesize_extra_kmaps_cb_args *args = data;
27 union perf_event *event = args->event;
28 struct kmap *kmap;
29 size_t size;
30
31 if (!__map__is_extra_kernel_map(map))
32 return 0;
33
34 kmap = map__kmap(map);
35
36 size = sizeof(event->mmap) - sizeof(event->mmap.filename) +
37 PERF_ALIGN(strlen(kmap->name) + 1, sizeof(u64)) +
38 args->machine->id_hdr_size;
39
40 memset(event, 0, size);
41
42 event->mmap.header.type = PERF_RECORD_MMAP;
43
44 /*
45 * kernel uses 0 for user space maps, see kernel/perf_event.c
46 * __perf_event_mmap
47 */
48 if (machine__is_host(args->machine))
49 event->header.misc = PERF_RECORD_MISC_KERNEL;
50 else
51 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
52
53 event->mmap.header.size = size;
54
55 event->mmap.start = map__start(map);
56 event->mmap.len = map__size(map);
57 event->mmap.pgoff = map__pgoff(map);
58 event->mmap.pid = args->machine->pid;
59
60 strlcpy(event->mmap.filename, kmap->name, PATH_MAX);
61
62 if (perf_tool__process_synth_event(tool: args->tool, event, machine: args->machine, process: args->process) != 0)
63 return -1;
64
65 return 0;
66}
67
68int perf_event__synthesize_extra_kmaps(const struct perf_tool *tool,
69 perf_event__handler_t process,
70 struct machine *machine)
71{
72 int rc;
73 struct maps *kmaps = machine__kernel_maps(machine);
74 struct perf_event__synthesize_extra_kmaps_cb_args args = {
75 .tool = tool,
76 .process = process,
77 .machine = machine,
78 .event = zalloc(sizeof(args.event->mmap) + machine->id_hdr_size),
79 };
80
81 if (!args.event) {
82 pr_debug("Not enough memory synthesizing mmap event "
83 "for extra kernel maps\n");
84 return -1;
85 }
86
87 rc = maps__for_each_map(maps: kmaps, cb: perf_event__synthesize_extra_kmaps_cb, data: &args);
88
89 free(args.event);
90 return rc;
91}
92
93#endif
94

source code of linux/tools/perf/arch/x86/util/event.c