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// SPDX-License-Identifier: GPL-2.0
#include <linux/types.h>
#include <linux/string.h>
#include <linux/zalloc.h>
#include <stdlib.h>
#include "../../../util/event.h"
#include "../../../util/synthetic-events.h"
#include "../../../util/machine.h"
#include "../../../util/tool.h"
#include "../../../util/map.h"
#include "../../../util/debug.h"
#include "util/sample.h"
#if defined(__x86_64__)
struct perf_event__synthesize_extra_kmaps_cb_args {
const struct perf_tool *tool;
perf_event__handler_t process;
struct machine *machine;
union perf_event *event;
};
static int perf_event__synthesize_extra_kmaps_cb(struct map *map, void *data)
{
struct perf_event__synthesize_extra_kmaps_cb_args *args = data;
union perf_event *event = args->event;
struct kmap *kmap;
size_t size;
if (!__map__is_extra_kernel_map(map))
return 0;
kmap = map__kmap(map);
size = sizeof(event->mmap) - sizeof(event->mmap.filename) +
PERF_ALIGN(strlen(kmap->name) + 1, sizeof(u64)) +
args->machine->id_hdr_size;
memset(event, 0, size);
event->mmap.header.type = PERF_RECORD_MMAP;
/*
* kernel uses 0 for user space maps, see kernel/perf_event.c
* __perf_event_mmap
*/
if (machine__is_host(args->machine))
event->header.misc = PERF_RECORD_MISC_KERNEL;
else
event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
event->mmap.header.size = size;
event->mmap.start = map__start(map);
event->mmap.len = map__size(map);
event->mmap.pgoff = map__pgoff(map);
event->mmap.pid = args->machine->pid;
strlcpy(event->mmap.filename, kmap->name, PATH_MAX);
if (perf_tool__process_synth_event(args->tool, event, args->machine, args->process) != 0)
return -1;
return 0;
}
int perf_event__synthesize_extra_kmaps(const struct perf_tool *tool,
perf_event__handler_t process,
struct machine *machine)
{
int rc;
struct maps *kmaps = machine__kernel_maps(machine);
struct perf_event__synthesize_extra_kmaps_cb_args args = {
.tool = tool,
.process = process,
.machine = machine,
.event = zalloc(sizeof(args.event->mmap) + machine->id_hdr_size),
};
if (!args.event) {
pr_debug("Not enough memory synthesizing mmap event "
"for extra kernel maps\n");
return -1;
}
rc = maps__for_each_map(kmaps, perf_event__synthesize_extra_kmaps_cb, &args);
free(args.event);
return rc;
}
#endif
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