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
15int 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
78