// SPDX-License-Identifier: GPL-2.0
/*
* builtin-inject.c
*
* Builtin inject command: Examine the live mode (stdin) event stream
* and repipe it to stdout while optionally injecting additional
* events into it.
*/
#include "builtin.h"
#include "util/color.h"
#include "util/dso.h"
#include "util/vdso.h"
#include "util/evlist.h"
#include "util/evsel.h"
#include "util/map.h"
#include "util/session.h"
#include "util/tool.h"
#include "util/debug.h"
#include "util/build-id.h"
#include "util/data.h"
#include "util/auxtrace.h"
#include "util/jit.h"
#include "util/string2.h"
#include "util/symbol.h"
#include "util/synthetic-events.h"
#include "util/thread.h"
#include "util/namespaces.h"
#include "util/util.h"
#include "util/tsc.h"
#include <internal/lib.h>
#include <linux/err.h>
#include <subcmd/parse-options.h>
#include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
#include <linux/list.h>
#include <linux/string.h>
#include <linux/zalloc.h>
#include <linux/hash.h>
#include <ctype.h>
#include <errno.h>
#include <signal.h>
#include <inttypes.h>
struct guest_event {
struct perf_sample sample;
union perf_event *event;
char *event_buf;
};
struct guest_id {
/* hlist_node must be first, see free_hlist() */
struct hlist_node node;
u64 id;
u64 host_id;
u32 vcpu;
};
struct guest_tid {
/* hlist_node must be first, see free_hlist() */
struct hlist_node node;
/* Thread ID of QEMU thread */
u32 tid;
u32 vcpu;
};
struct guest_vcpu {
/* Current host CPU */
u32 cpu;
/* Thread ID of QEMU thread */
u32 tid;
};
struct guest_session {
char *perf_data_file;
u32 machine_pid;
u64 time_offset;
double time_scale;
struct perf_tool tool;
struct perf_data data;
struct perf_session *session;
char *tmp_file_name;
int tmp_fd;
struct perf_tsc_conversion host_tc;
struct perf_tsc_conversion guest_tc;
bool copy_kcore_dir;
bool have_tc;
bool fetched;
bool ready;
u16 dflt_id_hdr_size;
u64 dflt_id;
u64 highest_id;
/* Array of guest_vcpu */
struct guest_vcpu *vcpu;
size_t vcpu_cnt;
/* Hash table for guest_id */
struct hlist_head heads[PERF_EVLIST__HLIST_SIZE];
/* Hash table for guest_tid */
struct hlist_head tids[PERF_EVLIST__HLIST_SIZE];
/* Place to stash next guest event */
struct guest_event ev;
};
struct perf_inject {
struct perf_tool tool;
struct perf_session *session;
bool build_ids;
bool build_id_all;
bool sched_stat;
bool have_auxtrace;
bool strip;
bool jit_mode;
bool in_place_update;
bool in_place_update_dry_run;
bool is_pipe;
bool copy_kcore_dir;
const char *input_name;
struct perf_data output;
u64 bytes_written;
u64 aux_id;
struct list_head samples;
struct itrace_synth_opts itrace_synth_opts;
char *event_copy;
struct perf_file_section secs[HEADER_FEAT_BITS];
struct guest_session guest_session;
struct strlist *known_build_ids;
};
struct event_entry {
struct list_head node;
u32 tid;
union perf_event event[];
};
static int dso__inject_build_id(struct dso *dso, struct perf_tool *tool,
struct machine *machine, u8 cpumode, u32 flags);
static int output_bytes(struct perf_inject *inject, void *buf, size_t sz)
{
ssize_t size;
size = perf_data__write(&inject->output, buf, sz);
if (size < 0)
return -errno;
inject->bytes_written += size;
return 0;
}
static int perf_event__repipe_synth(struct perf_tool *tool,
union perf_event *event)
{
struct perf_inject *inject = container_of(tool, struct perf_inject,
tool);
return output_bytes(inject, event, event->header.size);
}
static int perf_event__repipe_oe_synth(struct perf_tool *tool,
union perf_event *event,
struct ordered_events *oe __maybe_unused)
{
return perf_event__repipe_synth(tool, event);
}
#ifdef HAVE_JITDUMP
static int perf_event__drop_oe(struct perf_tool *tool __maybe_unused,
union perf_event *event __maybe_unused,
struct ordered_events *oe __maybe_unused)
{
return 0;
}
#endif
static int perf_event__repipe_op2_synth(struct perf_session *session,
union perf_event *event)
{
return perf_event__repipe_synth(session->tool, event);
}
static int perf_event__repipe_op4_synth(struct perf_session *session,
union perf_event *event,
u64 data __maybe_unused,
const char *str __maybe_unused)
{
return perf_event__repipe_synth(session->tool, event);
}
static int perf_event__repipe_attr(struct perf_tool *tool,
union perf_event *event,
struct evlist **pevlist)
{
struct perf_inject *inject = container_of(tool, struct perf_inject,
tool);
int ret;
ret = perf_event__process_attr(tool, event, pevlist);
if (ret)
return ret;
if (!inject->is_pipe)
return 0;
return perf_event__repipe_synth(tool, event);
}
static int perf_event__repipe_event_update(struct perf_tool *tool,
union perf_event *event,
struct evlist **pevlist __maybe_unused)
{
return perf_event__repipe_synth(tool, event);
}
#ifdef HAVE_AUXTRACE_SUPPORT
static int copy_bytes(struct perf_inject *inject, struct perf_data *data, off_t size)
{
char buf[4096];
ssize_t ssz;
int ret;
while (size > 0) {
ssz = perf_data__read(data, buf, min(size, (off_t)sizeof(buf)));
if (ssz < 0)
return -errno;
ret = output_bytes(inject, buf, ssz);
if (ret)
return ret;
size -= ssz;
}
return 0;
}
static s64 perf_event__repipe_auxtrace(struct perf_session *session,
union perf_event *event)
{
struct perf_tool *tool = session->tool;
struct perf_inject *inject = container_of(tool, struct perf_inject,
tool);
int ret;
inject->have_auxtrace = true;
if (!inject->output.is_pipe) {
off_t offset;
offset = lseek(inject->output.file.fd, 0, SEEK_CUR);
if (offset == -1)
return -errno;
ret = auxtrace_index__auxtrace_event(&session->auxtrace_index,
event, offset);
if (ret < 0)
return ret;
}
if (perf_data__is_pipe(session->data) || !session->one_mmap) {
ret = output_bytes(inject, event, event->header.size);
if (ret < 0)
return ret;
ret = copy_bytes(inject, session->data,
event->auxtrace.size);
} else {
ret = output_bytes(inject, event,
event->header.size + event->auxtrace.size);
}
if (ret < 0)
return ret;
return event->auxtrace.size;
}
#else
static s64
perf_event__repipe_auxtrace(struct perf_session *session __maybe_unused,
union perf_event *event __maybe_unused)
{
pr_err("AUX area tracing not supported\n");
return -EINVAL;
}
#endif
static int perf_event__repipe(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample __maybe_unused,
struct machine *machine __maybe_unused)
{
return perf_event__repipe_synth(tool, event);
}
static int perf_event__drop(struct perf_tool *tool __maybe_unused,
union perf_event *event __maybe_unused,
struct perf_sample *sample __maybe_unused,
struct machine *machine __maybe_unused)
{
return 0;
}
static int perf_event__drop_aux(struct perf_tool *tool,
union perf_event *event __maybe_unused,
struct perf_sample *sample,
struct machine *machine __maybe_unused)
{
struct perf_inject *inject = container_of(tool, struct perf_inject, tool);
if (!inject->aux_id)
inject->aux_id = sample->id;
return 0;
}
static union perf_event *
perf_inject__cut_auxtrace_sample(struct perf_inject *inject,
union perf_event *event,
struct perf_sample *sample)
{
size_t sz1 = sample->aux_sample.data - (void *)event;
size_t sz2 = event->header.size - sample->aux_sample.size - sz1;
union perf_event *ev;
if (inject->event_copy == NULL) {
inject->event_copy = malloc(PERF_SAMPLE_MAX_SIZE);
if (!inject->event_copy)
return ERR_PTR(-ENOMEM);
}
ev = (union perf_event *)inject->event_copy;
if (sz1 > event->header.size || sz2 > event->header.size ||
sz1 + sz2 > event->header.size ||
sz1 < sizeof(struct perf_event_header) + sizeof(u64))
return event;
memcpy(ev, event, sz1);
memcpy((void *)ev + sz1, (void *)event + event->header.size - sz2, sz2);
ev->header.size = sz1 + sz2;
((u64 *)((void *)ev + sz1))[-1] = 0;
return ev;
}
typedef int (*inject_handler)(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct evsel *evsel,
struct machine *machine);
static int perf_event__repipe_sample(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct evsel *evsel,
struct machine *machine)
{
struct perf_inject *inject = container_of(tool, struct perf_inject,
tool);
if (evsel && evsel->handler) {
inject_handler f = evsel->handler;
return f(tool, event, sample, evsel, machine);
}
build_id__mark_dso_hit(tool, event, sample, evsel, machine);
if (inject->itrace_synth_opts.set && sample->aux_sample.size) {
event = perf_inject__cut_auxtrace_sample(inject, event, sample);
if (IS_ERR(event))
return PTR_ERR(event);
}
return perf_event__repipe_synth(tool, event);
}
static int perf_event__repipe_mmap(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
int err;
err = perf_event__process_mmap(tool, event, sample, machine);
perf_event__repipe(tool, event, sample, machine);
return err;
}
#ifdef HAVE_JITDUMP
static int perf_event__jit_repipe_mmap(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
struct perf_inject *inject = container_of(tool, struct perf_inject, tool);
u64 n = 0;
int ret;
/*
* if jit marker, then inject jit mmaps and generate ELF images
*/
ret = jit_process(inject->session, &inject->output, machine,
event->mmap.filename, event->mmap.pid, event->mmap.tid, &n);
if (ret < 0)
return ret;
if (ret) {
inject->bytes_written += n;
return 0;
}
return perf_event__repipe_mmap(tool, event, sample, machine);
}
#endif
static struct dso *findnew_dso(int pid, int tid, const char *filename,
struct dso_id *id, struct machine *machine)
{
struct thread *thread;
struct nsinfo *nsi = NULL;
struct nsinfo *nnsi;
struct dso *dso;
bool vdso;
thread = machine__findnew_thread(machine, pid, tid);
if (thread == NULL) {
pr_err("cannot find or create a task %d/%d.\n", tid, pid);
return NULL;
}
vdso = is_vdso_map(filename);
nsi = nsinfo__get(thread__nsinfo(thread));
if (vdso) {
/* The vdso maps are always on the host and not the
* container. Ensure that we don't use setns to look
* them up.
*/
nnsi = nsinfo__copy(nsi);
if (nnsi) {
nsinfo__put(nsi);
nsinfo__clear_need_setns(nnsi);
nsi = nnsi;
}
dso = machine__findnew_vdso(machine, thread);
} else {
dso = machine__findnew_dso_id(machine, filename, id);
}
if (dso) {
mutex_lock(dso__lock(dso));
dso__set_nsinfo(dso, nsi);
mutex_unlock(dso__lock(dso));
} else
nsinfo__put(nsi);
thread__put(thread);
return dso;
}
static int perf_event__repipe_buildid_mmap(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
struct dso *dso;
dso = findnew_dso(event->mmap.pid, event->mmap.tid,
event->mmap.filename, NULL, machine);
if (dso && !dso__hit(dso)) {
dso__set_hit(dso);
dso__inject_build_id(dso, tool, machine, sample->cpumode, 0);
}
dso__put(dso);
return perf_event__repipe(tool, event, sample, machine);
}
static int perf_event__repipe_mmap2(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
int err;
err = perf_event__process_mmap2(tool, event, sample, machine);
perf_event__repipe(tool, event, sample, machine);
if (event->header.misc & PERF_RECORD_MISC_MMAP_BUILD_ID) {
struct dso *dso;
dso = findnew_dso(event->mmap2.pid, event->mmap2.tid,
event->mmap2.filename, NULL, machine);
if (dso) {
/* mark it not to inject build-id */
dso__set_hit(dso);
}
dso__put(dso);
}
return err;
}
#ifdef HAVE_JITDUMP
static int perf_event__jit_repipe_mmap2(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
struct perf_inject *inject = container_of(tool, struct perf_inject, tool);
u64 n = 0;
int ret;
/*
* if jit marker, then inject jit mmaps and generate ELF images
*/
ret = jit_process(inject->session, &inject->output, machine,
event->mmap2.filename, event->mmap2.pid, event->mmap2.tid, &n);
if (ret < 0)
return ret;
if (ret) {
inject->bytes_written += n;
return 0;
}
return perf_event__repipe_mmap2(tool, event, sample, machine);
}
#endif
static int perf_event__repipe_buildid_mmap2(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
struct dso_id dso_id = {
.maj = event->mmap2.maj,
.min = event->mmap2.min,
.ino = event->mmap2.ino,
.ino_generation = event->mmap2.ino_generation,
};
struct dso *dso;
if (event->header.misc & PERF_RECORD_MISC_MMAP_BUILD_ID) {
/* cannot use dso_id since it'd have invalid info */
dso = findnew_dso(event->mmap2.pid, event->mmap2.tid,
event->mmap2.filename, NULL, machine);
if (dso) {
/* mark it not to inject build-id */
dso__set_hit(dso);
}
dso__put(dso);
perf_event__repipe(tool, event, sample, machine);
return 0;
}
dso = findnew_dso(event->mmap2.pid, event->mmap2.tid,
event->mmap2.filename, &dso_id, machine);
if (dso && !dso__hit(dso)) {
dso__set_hit(dso);
dso__inject_build_id(dso, tool, machine, sample->cpumode,
event->mmap2.flags);
}
dso__put(dso);
perf_event__repipe(tool, event, sample, machine);
return 0;
}
static int perf_event__repipe_fork(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
int err;
err = perf_event__process_fork(tool, event, sample, machine);
perf_event__repipe(tool, event, sample, machine);
return err;
}
static int perf_event__repipe_comm(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
int err;
err = perf_event__process_comm(tool, event, sample, machine);
perf_event__repipe(tool, event, sample, machine);
return err;
}
static int perf_event__repipe_namespaces(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
int err = perf_event__process_namespaces(tool, event, sample, machine);
perf_event__repipe(tool, event, sample, machine);
return err;
}
static int perf_event__repipe_exit(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
int err;
err = perf_event__process_exit(tool, event, sample, machine);
perf_event__repipe(tool, event, sample, machine);
return err;
}
#ifdef HAVE_LIBTRACEEVENT
static int perf_event__repipe_tracing_data(struct perf_session *session,
union perf_event *event)
{
perf_event__repipe_synth(session->tool, event);
return perf_event__process_tracing_data(session, event);
}
#endif
static int dso__read_build_id(struct dso *dso)
{
struct nscookie nsc;
if (dso__has_build_id(dso))
return 0;
mutex_lock(dso__lock(dso));
nsinfo__mountns_enter(dso__nsinfo(dso), &nsc);
if (filename__read_build_id(dso__long_name(dso), dso__bid(dso)) > 0)
dso__set_has_build_id(dso);
else if (dso__nsinfo(dso)) {
char *new_name = dso__filename_with_chroot(dso, dso__long_name(dso));
if (new_name && filename__read_build_id(new_name, dso__bid(dso)) > 0)
dso__set_has_build_id(dso);
free(new_name);
}
nsinfo__mountns_exit(&nsc);
mutex_unlock(dso__lock(dso));
return dso__has_build_id(dso) ? 0 : -1;
}
static struct strlist *perf_inject__parse_known_build_ids(
const char *known_build_ids_string)
{
struct str_node *pos, *tmp;
struct strlist *known_build_ids;
int bid_len;
known_build_ids = strlist__new(known_build_ids_string, NULL);
if (known_build_ids == NULL)
return NULL;
strlist__for_each_entry_safe(pos, tmp, known_build_ids) {
const char *build_id, *dso_name;
build_id = skip_spaces(pos->s);
dso_name = strchr(build_id, ' ');
if (dso_name == NULL) {
strlist__remove(known_build_ids, pos);
continue;
}
bid_len = dso_name - pos->s;
dso_name = skip_spaces(dso_name);
if (bid_len % 2 != 0 || bid_len >= SBUILD_ID_SIZE) {
strlist__remove(known_build_ids, pos);
continue;
}
for (int ix = 0; 2 * ix + 1 < bid_len; ++ix) {
if (!isxdigit(build_id[2 * ix]) ||
!isxdigit(build_id[2 * ix + 1])) {
strlist__remove(known_build_ids, pos);
break;
}
}
}
return known_build_ids;
}
static bool perf_inject__lookup_known_build_id(struct perf_inject *inject,
struct dso *dso)
{
struct str_node *pos;
int bid_len;
strlist__for_each_entry(pos, inject->known_build_ids) {
const char *build_id, *dso_name;
build_id = skip_spaces(pos->s);
dso_name = strchr(build_id, ' ');
bid_len = dso_name - pos->s;
dso_name = skip_spaces(dso_name);
if (strcmp(dso__long_name(dso), dso_name))
continue;
for (int ix = 0; 2 * ix + 1 < bid_len; ++ix) {
dso__bid(dso)->data[ix] = (hex(build_id[2 * ix]) << 4 |
hex(build_id[2 * ix + 1]));
}
dso__bid(dso)->size = bid_len / 2;
dso__set_has_build_id(dso);
return true;
}
return false;
}
static int dso__inject_build_id(struct dso *dso, struct perf_tool *tool,
struct machine *machine, u8 cpumode, u32 flags)
{
struct perf_inject *inject = container_of(tool, struct perf_inject,
tool);
int err;
if (is_anon_memory(dso__long_name(dso)) || flags & MAP_HUGETLB)
return 0;
if (is_no_dso_memory(dso__long_name(dso)))
return 0;
if (inject->known_build_ids != NULL &&
perf_inject__lookup_known_build_id(inject, dso))
return 1;
if (dso__read_build_id(dso) < 0) {
pr_debug("no build_id found for %s\n", dso__long_name(dso));
return -1;
}
err = perf_event__synthesize_build_id(tool, dso, cpumode,
perf_event__repipe, machine);
if (err) {
pr_err("Can't synthesize build_id event for %s\n", dso__long_name(dso));
return -1;
}
return 0;
}
int perf_event__inject_buildid(struct perf_tool *tool, union perf_event *event,
struct perf_sample *sample,
struct evsel *evsel __maybe_unused,
struct machine *machine)
{
struct addr_location al;
struct thread *thread;
addr_location__init(&al);
thread = machine__findnew_thread(machine, sample->pid, sample->tid);
if (thread == NULL) {
pr_err("problem processing %d event, skipping it.\n",
event->header.type);
goto repipe;
}
if (thread__find_map(thread, sample->cpumode, sample->ip, &al)) {
struct dso *dso = map__dso(al.map);
if (!dso__hit(dso)) {
dso__set_hit(dso);
dso__inject_build_id(dso, tool, machine,
sample->cpumode, map__flags(al.map));
}
}
thread__put(thread);
repipe:
perf_event__repipe(tool, event, sample, machine);
addr_location__exit(&al);
return 0;
}
static int perf_inject__sched_process_exit(struct perf_tool *tool,
union perf_event *event __maybe_unused,
struct perf_sample *sample,
struct evsel *evsel __maybe_unused,
struct machine *machine __maybe_unused)
{
struct perf_inject *inject = container_of(tool, struct perf_inject, tool);
struct event_entry *ent;
list_for_each_entry(ent, &inject->samples, node) {
if (sample->tid == ent->tid) {
list_del_init(&ent->node);
free(ent);
break;
}
}
return 0;
}
static int perf_inject__sched_switch(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct evsel *evsel,
struct machine *machine)
{
struct perf_inject *inject = container_of(tool, struct perf_inject, tool);
struct event_entry *ent;
perf_inject__sched_process_exit(tool, event, sample, evsel, machine);
ent = malloc(event->header.size + sizeof(struct event_entry));
if (ent == NULL) {
color_fprintf(stderr, PERF_COLOR_RED,
"Not enough memory to process sched switch event!");
return -1;
}
ent->tid = sample->tid;
memcpy(&ent->event, event, event->header.size);
list_add(&ent->node, &inject->samples);
return 0;
}
#ifdef HAVE_LIBTRACEEVENT
static int perf_inject__sched_stat(struct perf_tool *tool,
union perf_event *event __maybe_unused,
struct perf_sample *sample,
struct evsel *evsel,
struct machine *machine)
{
struct event_entry *ent;
union perf_event *event_sw;
struct perf_sample sample_sw;
struct perf_inject *inject = container_of(tool, struct perf_inject, tool);
u32 pid = evsel__intval(evsel, sample, "pid");
list_for_each_entry(ent, &inject->samples, node) {
if (pid == ent->tid)
goto found;
}
return 0;
found:
event_sw = &ent->event[0];
evsel__parse_sample(evsel, event_sw, &sample_sw);
sample_sw.period = sample->period;
sample_sw.time = sample->time;
perf_event__synthesize_sample(event_sw, evsel->core.attr.sample_type,
evsel->core.attr.read_format, &sample_sw);
build_id__mark_dso_hit(tool, event_sw, &sample_sw, evsel, machine);
return perf_event__repipe(tool, event_sw, &sample_sw, machine);
}
#endif
static struct guest_vcpu *guest_session__vcpu(struct guest_session *gs, u32 vcpu)
{
if (realloc_array_as_needed(gs->vcpu, gs->vcpu_cnt, vcpu, NULL))
return NULL;
return &gs->vcpu[vcpu];
}
static int guest_session__output_bytes(struct guest_session *gs, void *buf, size_t sz)
{
ssize_t ret = writen(gs->tmp_fd, buf, sz);
return ret < 0 ? ret : 0;
}
static int guest_session__repipe(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample __maybe_unused,
struct machine *machine __maybe_unused)
{
struct guest_session *gs = container_of(tool, struct guest_session, tool);
return guest_session__output_bytes(gs, event, event->header.size);
}
static int guest_session__map_tid(struct guest_session *gs, u32 tid, u32 vcpu)
{
struct guest_tid *guest_tid = zalloc(sizeof(*guest_tid));
int hash;
if (!guest_tid)
return -ENOMEM;
guest_tid->tid = tid;
guest_tid->vcpu = vcpu;
hash = hash_32(guest_tid->tid, PERF_EVLIST__HLIST_BITS);
hlist_add_head(&guest_tid->node, &gs->tids[hash]);
return 0;
}
static int host_peek_vm_comms_cb(struct perf_session *session __maybe_unused,
union perf_event *event,
u64 offset __maybe_unused, void *data)
{
struct guest_session *gs = data;
unsigned int vcpu;
struct guest_vcpu *guest_vcpu;
int ret;
if (event->header.type != PERF_RECORD_COMM ||
event->comm.pid != gs->machine_pid)
return 0;
/*
* QEMU option -name debug-threads=on, causes thread names formatted as
* below, although it is not an ABI. Also libvirt seems to use this by
* default. Here we rely on it to tell us which thread is which VCPU.
*/
ret = sscanf(event->comm.comm, "CPU %u/KVM", &vcpu);
if (ret <= 0)
return ret;
pr_debug("Found VCPU: tid %u comm %s vcpu %u\n",
event->comm.tid, event->comm.comm, vcpu);
if (vcpu > INT_MAX) {
pr_err("Invalid VCPU %u\n", vcpu);
return -EINVAL;
}
guest_vcpu = guest_session__vcpu(gs, vcpu);
if (!guest_vcpu)
return -ENOMEM;
if (guest_vcpu->tid && guest_vcpu->tid != event->comm.tid) {
pr_err("Fatal error: Two threads found with the same VCPU\n");
return -EINVAL;
}
guest_vcpu->tid = event->comm.tid;
return guest_session__map_tid(gs, event->comm.tid, vcpu);
}
static int host_peek_vm_comms(struct perf_session *session, struct guest_session *gs)
{
return perf_session__peek_events(session, session->header.data_offset,
session->header.data_size,
host_peek_vm_comms_cb, gs);
}
static bool evlist__is_id_used(struct evlist *evlist, u64 id)
{
return evlist__id2sid(evlist, id);
}
static u64 guest_session__allocate_new_id(struct guest_session *gs, struct evlist *host_evlist)
{
do {
gs->highest_id += 1;
} while (!gs->highest_id || evlist__is_id_used(host_evlist, gs->highest_id));
return gs->highest_id;
}
static int guest_session__map_id(struct guest_session *gs, u64 id, u64 host_id, u32 vcpu)
{
struct guest_id *guest_id = zalloc(sizeof(*guest_id));
int hash;
if (!guest_id)
return -ENOMEM;
guest_id->id = id;
guest_id->host_id = host_id;
guest_id->vcpu = vcpu;
hash = hash_64(guest_id->id, PERF_EVLIST__HLIST_BITS);
hlist_add_head(&guest_id->node, &gs->heads[hash]);
return 0;
}
static u64 evlist__find_highest_id(struct evlist *evlist)
{
struct evsel *evsel;
u64 highest_id = 1;
evlist__for_each_entry(evlist, evsel) {
u32 j;
for (j = 0; j < evsel->core.ids; j++) {
u64 id = evsel->core.id[j];
if (id > highest_id)
highest_id = id;
}
}
return highest_id;
}
static int guest_session__map_ids(struct guest_session *gs, struct evlist *host_evlist)
{
struct evlist *evlist = gs->session->evlist;
struct evsel *evsel;
int ret;
evlist__for_each_entry(evlist, evsel) {
u32 j;
for (j = 0; j < evsel->core.ids; j++) {
struct perf_sample_id *sid;
u64 host_id;
u64 id;
id = evsel->core.id[j];
sid = evlist__id2sid(evlist, id);
if (!sid || sid->cpu.cpu == -1)
continue;
host_id = guest_session__allocate_new_id(gs, host_evlist);
ret = guest_session__map_id(gs, id, host_id, sid->cpu.cpu);
if (ret)
return ret;
}
}
return 0;
}
static struct guest_id *guest_session__lookup_id(struct guest_session *gs, u64 id)
{
struct hlist_head *head;
struct guest_id *guest_id;
int hash;
hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
head = &gs->heads[hash];
hlist_for_each_entry(guest_id, head, node)
if (guest_id->id == id)
return guest_id;
return NULL;
}
static int process_attr(struct perf_tool *tool, union perf_event *event,
struct perf_sample *sample __maybe_unused,
struct machine *machine __maybe_unused)
{
struct perf_inject *inject = container_of(tool, struct perf_inject, tool);
return perf_event__process_attr(tool, event, &inject->session->evlist);
}
static int guest_session__add_attr(struct guest_session *gs, struct evsel *evsel)
{
struct perf_inject *inject = container_of(gs, struct perf_inject, guest_session);
struct perf_event_attr attr = evsel->core.attr;
u64 *id_array;
u32 *vcpu_array;
int ret = -ENOMEM;
u32 i;
id_array = calloc(evsel->core.ids, sizeof(*id_array));
if (!id_array)
return -ENOMEM;
vcpu_array = calloc(evsel->core.ids, sizeof(*vcpu_array));
if (!vcpu_array)
goto out;
for (i = 0; i < evsel->core.ids; i++) {
u64 id = evsel->core.id[i];
struct guest_id *guest_id = guest_session__lookup_id(gs, id);
if (!guest_id) {
pr_err("Failed to find guest id %"PRIu64"\n", id);
ret = -EINVAL;
goto out;
}
id_array[i] = guest_id->host_id;
vcpu_array[i] = guest_id->vcpu;
}
attr.sample_type |= PERF_SAMPLE_IDENTIFIER;
attr.exclude_host = 1;
attr.exclude_guest = 0;
ret = perf_event__synthesize_attr(&inject->tool, &attr, evsel->core.ids,
id_array, process_attr);
if (ret)
pr_err("Failed to add guest attr.\n");
for (i = 0; i < evsel->core.ids; i++) {
struct perf_sample_id *sid;
u32 vcpu = vcpu_array[i];
sid = evlist__id2sid(inject->session->evlist, id_array[i]);
/* Guest event is per-thread from the host point of view */
sid->cpu.cpu = -1;
sid->tid = gs->vcpu[vcpu].tid;
sid->machine_pid = gs->machine_pid;
sid->vcpu.cpu = vcpu;
}
out:
free(vcpu_array);
free(id_array);
return ret;
}
static int guest_session__add_attrs(struct guest_session *gs)
{
struct evlist *evlist = gs->session->evlist;
struct evsel *evsel;
int ret;
evlist__for_each_entry(evlist, evsel) {
ret = guest_session__add_attr(gs, evsel);
if (ret)
return ret;
}
return 0;
}
static int synthesize_id_index(struct perf_inject *inject, size_t new_cnt)
{
struct perf_session *session = inject->session;
struct evlist *evlist = session->evlist;
struct machine *machine = &session->machines.host;
size_t from = evlist->core.nr_entries - new_cnt;
return __perf_event__synthesize_id_index(&inject->tool, perf_event__repipe,
evlist, machine, from);
}
static struct guest_tid *guest_session__lookup_tid(struct guest_session *gs, u32 tid)
{
struct hlist_head *head;
struct guest_tid *guest_tid;
int hash;
hash = hash_32(tid, PERF_EVLIST__HLIST_BITS);
head = &gs->tids[hash];
hlist_for_each_entry(guest_tid, head, node)
if (guest_tid->tid == tid)
return guest_tid;
return NULL;
}
static bool dso__is_in_kernel_space(struct dso *dso)
{
if (dso__is_vdso(dso))
return false;
return dso__is_kcore(dso) ||
dso__kernel(dso) ||
is_kernel_module(dso__long_name(dso), PERF_RECORD_MISC_CPUMODE_UNKNOWN);
}
static u64 evlist__first_id(struct evlist *evlist)
{
struct evsel *evsel;
evlist__for_each_entry(evlist, evsel) {
if (evsel->core.ids)
return evsel->core.id[0];
}
return 0;
}
static int process_build_id(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample __maybe_unused,
struct machine *machine __maybe_unused)
{
struct perf_inject *inject = container_of(tool, struct perf_inject, tool);
return perf_event__process_build_id(inject->session, event);
}
static int synthesize_build_id(struct perf_inject *inject, struct dso *dso, pid_t machine_pid)
{
struct machine *machine = perf_session__findnew_machine(inject->session, machine_pid);
u8 cpumode = dso__is_in_kernel_space(dso) ?
PERF_RECORD_MISC_GUEST_KERNEL :
PERF_RECORD_MISC_GUEST_USER;
if (!machine)
return -ENOMEM;
dso__set_hit(dso);
return perf_event__synthesize_build_id(&inject->tool, dso, cpumode,
process_build_id, machine);
}
static int guest_session__add_build_ids_cb(struct dso *dso, void *data)
{
struct guest_session *gs = data;
struct perf_inject *inject = container_of(gs, struct perf_inject, guest_session);
if (!dso__has_build_id(dso))
return 0;
return synthesize_build_id(inject, dso, gs->machine_pid);
}
static int guest_session__add_build_ids(struct guest_session *gs)
{
struct perf_inject *inject = container_of(gs, struct perf_inject, guest_session);
/* Build IDs will be put in the Build ID feature section */
perf_header__set_feat(&inject->session->header, HEADER_BUILD_ID);
return dsos__for_each_dso(&gs->session->machines.host.dsos,
guest_session__add_build_ids_cb,
gs);
}
static int guest_session__ksymbol_event(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample __maybe_unused,
struct machine *machine __maybe_unused)
{
struct guest_session *gs = container_of(tool, struct guest_session, tool);
/* Only support out-of-line i.e. no BPF support */
if (event->ksymbol.ksym_type != PERF_RECORD_KSYMBOL_TYPE_OOL)
return 0;
return guest_session__output_bytes(gs, event, event->header.size);
}
static int guest_session__start(struct guest_session *gs, const char *name, bool force)
{
char tmp_file_name[] = "/tmp/perf-inject-guest_session-XXXXXX";
struct perf_session *session;
int ret;
/* Only these events will be injected */
gs->tool.mmap = guest_session__repipe;
gs->tool.mmap2 = guest_session__repipe;
gs->tool.comm = guest_session__repipe;
gs->tool.fork = guest_session__repipe;
gs->tool.exit = guest_session__repipe;
gs->tool.lost = guest_session__repipe;
gs->tool.context_switch = guest_session__repipe;
gs->tool.ksymbol = guest_session__ksymbol_event;
gs->tool.text_poke = guest_session__repipe;
/*
* Processing a build ID creates a struct dso with that build ID. Later,
* all guest dsos are iterated and the build IDs processed into the host
* session where they will be output to the Build ID feature section
* when the perf.data file header is written.
*/
gs->tool.build_id = perf_event__process_build_id;
/* Process the id index to know what VCPU an ID belongs to */
gs->tool.id_index = perf_event__process_id_index;
gs->tool.ordered_events = true;
gs->tool.ordering_requires_timestamps = true;
gs->data.path = name;
gs->data.force = force;
gs->data.mode = PERF_DATA_MODE_READ;
session = perf_session__new(&gs->data, &gs->tool);
if (IS_ERR(session))
return PTR_ERR(session);
gs->session = session;
/*
* Initial events have zero'd ID samples. Get default ID sample size
* used for removing them.
*/
gs->dflt_id_hdr_size = session->machines.host.id_hdr_size;
/* And default ID for adding back a host-compatible ID sample */
gs->dflt_id = evlist__first_id(session->evlist);
if (!gs->dflt_id) {
pr_err("Guest data has no sample IDs");
return -EINVAL;
}
/* Temporary file for guest events */
gs->tmp_file_name = strdup(tmp_file_name);
if (!gs->tmp_file_name)
return -ENOMEM;
gs->tmp_fd = mkstemp(gs->tmp_file_name);
if (gs->tmp_fd < 0)
return -errno;
if (zstd_init(&gs->session->zstd_data, 0) < 0)
pr_warning("Guest session decompression initialization failed.\n");
/*
* perf does not support processing 2 sessions simultaneously, so output
* guest events to a temporary file.
*/
ret = perf_session__process_events(gs->session);
if (ret)
return ret;
if (lseek(gs->tmp_fd, 0, SEEK_SET))
return -errno;
return 0;
}
/* Free hlist nodes assuming hlist_node is the first member of hlist entries */
static void free_hlist(struct hlist_head *heads, size_t hlist_sz)
{
struct hlist_node *pos, *n;
size_t i;
for (i = 0; i < hlist_sz; ++i) {
hlist_for_each_safe(pos, n, &heads[i]) {
hlist_del(pos);
free(pos);
}
}
}
static void guest_session__exit(struct guest_session *gs)
{
if (gs->session) {
perf_session__delete(gs->session);
free_hlist(gs->heads, PERF_EVLIST__HLIST_SIZE);
free_hlist(gs->tids, PERF_EVLIST__HLIST_SIZE);
}
if (gs->tmp_file_name) {
if (gs->tmp_fd >= 0)
close(gs->tmp_fd);
unlink(gs->tmp_file_name);
zfree(&gs->tmp_file_name);
}
zfree(&gs->vcpu);
zfree(&gs->perf_data_file);
}
static void get_tsc_conv(struct perf_tsc_conversion *tc, struct perf_record_time_conv *time_conv)
{
tc->time_shift = time_conv->time_shift;
tc->time_mult = time_conv->time_mult;
tc->time_zero = time_conv->time_zero;
tc->time_cycles = time_conv->time_cycles;
tc->time_mask = time_conv->time_mask;
tc->cap_user_time_zero = time_conv->cap_user_time_zero;
tc->cap_user_time_short = time_conv->cap_user_time_short;
}
static void guest_session__get_tc(struct guest_session *gs)
{
struct perf_inject *inject = container_of(gs, struct perf_inject, guest_session);
get_tsc_conv(&gs->host_tc, &inject->session->time_conv);
get_tsc_conv(&gs->guest_tc, &gs->session->time_conv);
}
static void guest_session__convert_time(struct guest_session *gs, u64 guest_time, u64 *host_time)
{
u64 tsc;
if (!guest_time) {
*host_time = 0;
return;
}
if (gs->guest_tc.cap_user_time_zero)
tsc = perf_time_to_tsc(guest_time, &gs->guest_tc);
else
tsc = guest_time;
/*
* This is the correct order of operations for x86 if the TSC Offset and
* Multiplier values are used.
*/
tsc -= gs->time_offset;
tsc /= gs->time_scale;
if (gs->host_tc.cap_user_time_zero)
*host_time = tsc_to_perf_time(tsc, &gs->host_tc);
else
*host_time = tsc;
}
static int guest_session__fetch(struct guest_session *gs)
{
void *buf;
struct perf_event_header *hdr;
size_t hdr_sz = sizeof(*hdr);
ssize_t ret;
buf = gs->ev.event_buf;
if (!buf) {
buf = malloc(PERF_SAMPLE_MAX_SIZE);
if (!buf)
return -ENOMEM;
gs->ev.event_buf = buf;
}
hdr = buf;
ret = readn(gs->tmp_fd, buf, hdr_sz);
if (ret < 0)
return ret;
if (!ret) {
/* Zero size means EOF */
hdr->size = 0;
return 0;
}
buf += hdr_sz;
ret = readn(gs->tmp_fd, buf, hdr->size - hdr_sz);
if (ret < 0)
return ret;
gs->ev.event = (union perf_event *)gs->ev.event_buf;
gs->ev.sample.time = 0;
if (hdr->type >= PERF_RECORD_USER_TYPE_START) {
pr_err("Unexpected type fetching guest event");
return 0;
}
ret = evlist__parse_sample(gs->session->evlist, gs->ev.event, &gs->ev.sample);
if (ret) {
pr_err("Parse failed fetching guest event");
return ret;
}
if (!gs->have_tc) {
guest_session__get_tc(gs);
gs->have_tc = true;
}
guest_session__convert_time(gs, gs->ev.sample.time, &gs->ev.sample.time);
return 0;
}
static int evlist__append_id_sample(struct evlist *evlist, union perf_event *ev,
const struct perf_sample *sample)
{
struct evsel *evsel;
void *array;
int ret;
evsel = evlist__id2evsel(evlist, sample->id);
array = ev;
if (!evsel) {
pr_err("No evsel for id %"PRIu64"\n", sample->id);
return -EINVAL;
}
array += ev->header.size;
ret = perf_event__synthesize_id_sample(array, evsel->core.attr.sample_type, sample);
if (ret < 0)
return ret;
if (ret & 7) {
pr_err("Bad id sample size %d\n", ret);
return -EINVAL;
}
ev->header.size += ret;
return 0;
}
static int guest_session__inject_events(struct guest_session *gs, u64 timestamp)
{
struct perf_inject *inject = container_of(gs, struct perf_inject, guest_session);
int ret;
if (!gs->ready)
return 0;
while (1) {
struct perf_sample *sample;
struct guest_id *guest_id;
union perf_event *ev;
u16 id_hdr_size;
u8 cpumode;
u64 id;
if (!gs->fetched) {
ret = guest_session__fetch(gs);
if (ret)
return ret;
gs->fetched = true;
}
ev = gs->ev.event;
sample = &gs->ev.sample;
if (!ev->header.size)
return 0; /* EOF */
if (sample->time > timestamp)
return 0;
/* Change cpumode to guest */
cpumode = ev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
if (cpumode & PERF_RECORD_MISC_USER)
cpumode = PERF_RECORD_MISC_GUEST_USER;
else
cpumode = PERF_RECORD_MISC_GUEST_KERNEL;
ev->header.misc &= ~PERF_RECORD_MISC_CPUMODE_MASK;
ev->header.misc |= cpumode;
id = sample->id;
if (!id) {
id = gs->dflt_id;
id_hdr_size = gs->dflt_id_hdr_size;
} else {
struct evsel *evsel = evlist__id2evsel(gs->session->evlist, id);
id_hdr_size = evsel__id_hdr_size(evsel);
}
if (id_hdr_size & 7) {
pr_err("Bad id_hdr_size %u\n", id_hdr_size);
return -EINVAL;
}
if (ev->header.size & 7) {
pr_err("Bad event size %u\n", ev->header.size);
return -EINVAL;
}
/* Remove guest id sample */
ev->header.size -= id_hdr_size;
if (ev->header.size & 7) {
pr_err("Bad raw event size %u\n", ev->header.size);
return -EINVAL;
}
guest_id = guest_session__lookup_id(gs, id);
if (!guest_id) {
pr_err("Guest event with unknown id %llu\n",
(unsigned long long)id);
return -EINVAL;
}
/* Change to host ID to avoid conflicting ID values */
sample->id = guest_id->host_id;
sample->stream_id = guest_id->host_id;
if (sample->cpu != (u32)-1) {
if (sample->cpu >= gs->vcpu_cnt) {
pr_err("Guest event with unknown VCPU %u\n",
sample->cpu);
return -EINVAL;
}
/* Change to host CPU instead of guest VCPU */
sample->cpu = gs->vcpu[sample->cpu].cpu;
}
/* New id sample with new ID and CPU */
ret = evlist__append_id_sample(inject->session->evlist, ev, sample);
if (ret)
return ret;
if (ev->header.size & 7) {
pr_err("Bad new event size %u\n", ev->header.size);
return -EINVAL;
}
gs->fetched = false;
ret = output_bytes(inject, ev, ev->header.size);
if (ret)
return ret;
}
}
static int guest_session__flush_events(struct guest_session *gs)
{
return guest_session__inject_events(gs, -1);
}
static int host__repipe(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
struct perf_inject *inject = container_of(tool, struct perf_inject, tool);
int ret;
ret = guest_session__inject_events(&inject->guest_session, sample->time);
if (ret)
return ret;
return perf_event__repipe(tool, event, sample, machine);
}
static int host__finished_init(struct perf_session *session, union perf_event *event)
{
struct perf_inject *inject = container_of(session->tool, struct perf_inject, tool);
struct guest_session *gs = &inject->guest_session;
int ret;
/*
* Peek through host COMM events to find QEMU threads and the VCPU they
* are running.
*/
ret = host_peek_vm_comms(session, gs);
if (ret)
return ret;
if (!gs->vcpu_cnt) {
pr_err("No VCPU threads found for pid %u\n", gs->machine_pid);
return -EINVAL;
}
/*
* Allocate new (unused) host sample IDs and map them to the guest IDs.
*/
gs->highest_id = evlist__find_highest_id(session->evlist);
ret = guest_session__map_ids(gs, session->evlist);
if (ret)
return ret;
ret = guest_session__add_attrs(gs);
if (ret)
return ret;
ret = synthesize_id_index(inject, gs->session->evlist->core.nr_entries);
if (ret) {
pr_err("Failed to synthesize id_index\n");
return ret;
}
ret = guest_session__add_build_ids(gs);
if (ret) {
pr_err("Failed to add guest build IDs\n");
return ret;
}
gs->ready = true;
ret = guest_session__inject_events(gs, 0);
if (ret)
return ret;
return perf_event__repipe_op2_synth(session, event);
}
/*
* Obey finished-round ordering. The FINISHED_ROUND event is first processed
* which flushes host events to file up until the last flush time. Then inject
* guest events up to the same time. Finally write out the FINISHED_ROUND event
* itself.
*/
static int host__finished_round(struct perf_tool *tool,
union perf_event *event,
struct ordered_events *oe)
{
struct perf_inject *inject = container_of(tool, struct perf_inject, tool);
int ret = perf_event__process_finished_round(tool, event, oe);
u64 timestamp = ordered_events__last_flush_time(oe);
if (ret)
return ret;
ret = guest_session__inject_events(&inject->guest_session, timestamp);
if (ret)
return ret;
return perf_event__repipe_oe_synth(tool, event, oe);
}
static int host__context_switch(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
struct perf_inject *inject = container_of(tool, struct perf_inject, tool);
bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT;
struct guest_session *gs = &inject->guest_session;
u32 pid = event->context_switch.next_prev_pid;
u32 tid = event->context_switch.next_prev_tid;
struct guest_tid *guest_tid;
u32 vcpu;
if (out || pid != gs->machine_pid)
goto out;
guest_tid = guest_session__lookup_tid(gs, tid);
if (!guest_tid)
goto out;
if (sample->cpu == (u32)-1) {
pr_err("Switch event does not have CPU\n");
return -EINVAL;
}
vcpu = guest_tid->vcpu;
if (vcpu >= gs->vcpu_cnt)
return -EINVAL;
/* Guest is switching in, record which CPU the VCPU is now running on */
gs->vcpu[vcpu].cpu = sample->cpu;
out:
return host__repipe(tool, event, sample, machine);
}
static void sig_handler(int sig __maybe_unused)
{
session_done = 1;
}
static int evsel__check_stype(struct evsel *evsel, u64 sample_type, const char *sample_msg)
{
struct perf_event_attr *attr = &evsel->core.attr;
const char *name = evsel__name(evsel);
if (!(attr->sample_type & sample_type)) {
pr_err("Samples for %s event do not have %s attribute set.",
name, sample_msg);
return -EINVAL;
}
return 0;
}
static int drop_sample(struct perf_tool *tool __maybe_unused,
union perf_event *event __maybe_unused,
struct perf_sample *sample __maybe_unused,
struct evsel *evsel __maybe_unused,
struct machine *machine __maybe_unused)
{
return 0;
}
static void strip_init(struct perf_inject *inject)
{
struct evlist *evlist = inject->session->evlist;
struct evsel *evsel;
inject->tool.context_switch = perf_event__drop;
evlist__for_each_entry(evlist, evsel)
evsel->handler = drop_sample;
}
static int parse_vm_time_correlation(const struct option *opt, const char *str, int unset)
{
struct perf_inject *inject = opt->value;
const char *args;
char *dry_run;
if (unset)
return 0;
inject->itrace_synth_opts.set = true;
inject->itrace_synth_opts.vm_time_correlation = true;
inject->in_place_update = true;
if (!str)
return 0;
dry_run = skip_spaces(str);
if (!strncmp(dry_run, "dry-run", strlen("dry-run"))) {
inject->itrace_synth_opts.vm_tm_corr_dry_run = true;
inject->in_place_update_dry_run = true;
args = dry_run + strlen("dry-run");
} else {
args = str;
}
inject->itrace_synth_opts.vm_tm_corr_args = strdup(args);
return inject->itrace_synth_opts.vm_tm_corr_args ? 0 : -ENOMEM;
}
static int parse_guest_data(const struct option *opt, const char *str, int unset)
{
struct perf_inject *inject = opt->value;
struct guest_session *gs = &inject->guest_session;
char *tok;
char *s;
if (unset)
return 0;
if (!str)
goto bad_args;
s = strdup(str);
if (!s)
return -ENOMEM;
gs->perf_data_file = strsep(&s, ",");
if (!gs->perf_data_file)
goto bad_args;
gs->copy_kcore_dir = has_kcore_dir(gs->perf_data_file);
if (gs->copy_kcore_dir)
inject->output.is_dir = true;
tok = strsep(&s, ",");
if (!tok)
goto bad_args;
gs->machine_pid = strtoul(tok, NULL, 0);
if (!inject->guest_session.machine_pid)
goto bad_args;
gs->time_scale = 1;
tok = strsep(&s, ",");
if (!tok)
goto out;
gs->time_offset = strtoull(tok, NULL, 0);
tok = strsep(&s, ",");
if (!tok)
goto out;
gs->time_scale = strtod(tok, NULL);
if (!gs->time_scale)
goto bad_args;
out:
return 0;
bad_args:
pr_err("--guest-data option requires guest perf.data file name, "
"guest machine PID, and optionally guest timestamp offset, "
"and guest timestamp scale factor, separated by commas.\n");
return -1;
}
static int save_section_info_cb(struct perf_file_section *section,
struct perf_header *ph __maybe_unused,
int feat, int fd __maybe_unused, void *data)
{
struct perf_inject *inject = data;
inject->secs[feat] = *section;
return 0;
}
static int save_section_info(struct perf_inject *inject)
{
struct perf_header *header = &inject->session->header;
int fd = perf_data__fd(inject->session->data);
return perf_header__process_sections(header, fd, inject, save_section_info_cb);
}
static bool keep_feat(int feat)
{
switch (feat) {
/* Keep original information that describes the machine or software */
case HEADER_TRACING_DATA:
case HEADER_HOSTNAME:
case HEADER_OSRELEASE:
case HEADER_VERSION:
case HEADER_ARCH:
case HEADER_NRCPUS:
case HEADER_CPUDESC:
case HEADER_CPUID:
case HEADER_TOTAL_MEM:
case HEADER_CPU_TOPOLOGY:
case HEADER_NUMA_TOPOLOGY:
case HEADER_PMU_MAPPINGS:
case HEADER_CACHE:
case HEADER_MEM_TOPOLOGY:
case HEADER_CLOCKID:
case HEADER_BPF_PROG_INFO:
case HEADER_BPF_BTF:
case HEADER_CPU_PMU_CAPS:
case HEADER_CLOCK_DATA:
case HEADER_HYBRID_TOPOLOGY:
case HEADER_PMU_CAPS:
return true;
/* Information that can be updated */
case HEADER_BUILD_ID:
case HEADER_CMDLINE:
case HEADER_EVENT_DESC:
case HEADER_BRANCH_STACK:
case HEADER_GROUP_DESC:
case HEADER_AUXTRACE:
case HEADER_STAT:
case HEADER_SAMPLE_TIME:
case HEADER_DIR_FORMAT:
case HEADER_COMPRESSED:
default:
return false;
};
}
static int read_file(int fd, u64 offs, void *buf, size_t sz)
{
ssize_t ret = preadn(fd, buf, sz, offs);
if (ret < 0)
return -errno;
if ((size_t)ret != sz)
return -EINVAL;
return 0;
}
static int feat_copy(struct perf_inject *inject, int feat, struct feat_writer *fw)
{
int fd = perf_data__fd(inject->session->data);
u64 offs = inject->secs[feat].offset;
size_t sz = inject->secs[feat].size;
void *buf = malloc(sz);
int ret;
if (!buf)
return -ENOMEM;
ret = read_file(fd, offs, buf, sz);
if (ret)
goto out_free;
ret = fw->write(fw, buf, sz);
out_free:
free(buf);
return ret;
}
struct inject_fc {
struct feat_copier fc;
struct perf_inject *inject;
};
static int feat_copy_cb(struct feat_copier *fc, int feat, struct feat_writer *fw)
{
struct inject_fc *inj_fc = container_of(fc, struct inject_fc, fc);
struct perf_inject *inject = inj_fc->inject;
int ret;
if (!inject->secs[feat].offset ||
!keep_feat(feat))
return 0;
ret = feat_copy(inject, feat, fw);
if (ret < 0)
return ret;
return 1; /* Feature section copied */
}
static int copy_kcore_dir(struct perf_inject *inject)
{
char *cmd;
int ret;
ret = asprintf(&cmd, "cp -r -n %s/kcore_dir* %s >/dev/null 2>&1",
inject->input_name, inject->output.path);
if (ret < 0)
return ret;
pr_debug("%s\n", cmd);
ret = system(cmd);
free(cmd);
return ret;
}
static int guest_session__copy_kcore_dir(struct guest_session *gs)
{
struct perf_inject *inject = container_of(gs, struct perf_inject, guest_session);
char *cmd;
int ret;
ret = asprintf(&cmd, "cp -r -n %s/kcore_dir %s/kcore_dir__%u >/dev/null 2>&1",
gs->perf_data_file, inject->output.path, gs->machine_pid);
if (ret < 0)
return ret;
pr_debug("%s\n", cmd);
ret = system(cmd);
free(cmd);
return ret;
}
static int output_fd(struct perf_inject *inject)
{
return inject->in_place_update ? -1 : perf_data__fd(&inject->output);
}
static int __cmd_inject(struct perf_inject *inject)
{
int ret = -EINVAL;
struct guest_session *gs = &inject->guest_session;
struct perf_session *session = inject->session;
int fd = output_fd(inject);
u64 output_data_offset;
signal(SIGINT, sig_handler);
if (inject->build_ids || inject->sched_stat ||
inject->itrace_synth_opts.set || inject->build_id_all) {
inject->tool.mmap = perf_event__repipe_mmap;
inject->tool.mmap2 = perf_event__repipe_mmap2;
inject->tool.fork = perf_event__repipe_fork;
#ifdef HAVE_LIBTRACEEVENT
inject->tool.tracing_data = perf_event__repipe_tracing_data;
#endif
}
output_data_offset = perf_session__data_offset(session->evlist);
if (inject->build_id_all) {
inject->tool.mmap = perf_event__repipe_buildid_mmap;
inject->tool.mmap2 = perf_event__repipe_buildid_mmap2;
} else if (inject->build_ids) {
inject->tool.sample = perf_event__inject_buildid;
} else if (inject->sched_stat) {
struct evsel *evsel;
evlist__for_each_entry(session->evlist, evsel) {
const char *name = evsel__name(evsel);
if (!strcmp(name, "sched:sched_switch")) {
if (evsel__check_stype(evsel, PERF_SAMPLE_TID, "TID"))
return -EINVAL;
evsel->handler = perf_inject__sched_switch;
} else if (!strcmp(name, "sched:sched_process_exit"))
evsel->handler = perf_inject__sched_process_exit;
#ifdef HAVE_LIBTRACEEVENT
else if (!strncmp(name, "sched:sched_stat_", 17))
evsel->handler = perf_inject__sched_stat;
#endif
}
} else if (inject->itrace_synth_opts.vm_time_correlation) {
session->itrace_synth_opts = &inject->itrace_synth_opts;
memset(&inject->tool, 0, sizeof(inject->tool));
inject->tool.id_index = perf_event__process_id_index;
inject->tool.auxtrace_info = perf_event__process_auxtrace_info;
inject->tool.auxtrace = perf_event__process_auxtrace;
inject->tool.auxtrace_error = perf_event__process_auxtrace_error;
inject->tool.ordered_events = true;
inject->tool.ordering_requires_timestamps = true;
} else if (inject->itrace_synth_opts.set) {
session->itrace_synth_opts = &inject->itrace_synth_opts;
inject->itrace_synth_opts.inject = true;
inject->tool.comm = perf_event__repipe_comm;
inject->tool.namespaces = perf_event__repipe_namespaces;
inject->tool.exit = perf_event__repipe_exit;
inject->tool.id_index = perf_event__process_id_index;
inject->tool.auxtrace_info = perf_event__process_auxtrace_info;
inject->tool.auxtrace = perf_event__process_auxtrace;
inject->tool.aux = perf_event__drop_aux;
inject->tool.itrace_start = perf_event__drop_aux;
inject->tool.aux_output_hw_id = perf_event__drop_aux;
inject->tool.ordered_events = true;
inject->tool.ordering_requires_timestamps = true;
/* Allow space in the header for new attributes */
output_data_offset = roundup(8192 + session->header.data_offset, 4096);
if (inject->strip)
strip_init(inject);
} else if (gs->perf_data_file) {
char *name = gs->perf_data_file;
/*
* Not strictly necessary, but keep these events in order wrt
* guest events.
*/
inject->tool.mmap = host__repipe;
inject->tool.mmap2 = host__repipe;
inject->tool.comm = host__repipe;
inject->tool.fork = host__repipe;
inject->tool.exit = host__repipe;
inject->tool.lost = host__repipe;
inject->tool.context_switch = host__repipe;
inject->tool.ksymbol = host__repipe;
inject->tool.text_poke = host__repipe;
/*
* Once the host session has initialized, set up sample ID
* mapping and feed in guest attrs, build IDs and initial
* events.
*/
inject->tool.finished_init = host__finished_init;
/* Obey finished round ordering */
inject->tool.finished_round = host__finished_round,
/* Keep track of which CPU a VCPU is runnng on */
inject->tool.context_switch = host__context_switch;
/*
* Must order events to be able to obey finished round
* ordering.
*/
inject->tool.ordered_events = true;
inject->tool.ordering_requires_timestamps = true;
/* Set up a separate session to process guest perf.data file */
ret = guest_session__start(gs, name, session->data->force);
if (ret) {
pr_err("Failed to process %s, error %d\n", name, ret);
return ret;
}
/* Allow space in the header for guest attributes */
output_data_offset += gs->session->header.data_offset;
output_data_offset = roundup(output_data_offset, 4096);
}
if (!inject->itrace_synth_opts.set)
auxtrace_index__free(&session->auxtrace_index);
if (!inject->is_pipe && !inject->in_place_update)
lseek(fd, output_data_offset, SEEK_SET);
ret = perf_session__process_events(session);
if (ret)
return ret;
if (gs->session) {
/*
* Remaining guest events have later timestamps. Flush them
* out to file.
*/
ret = guest_session__flush_events(gs);
if (ret) {
pr_err("Failed to flush guest events\n");
return ret;
}
}
if (!inject->is_pipe && !inject->in_place_update) {
struct inject_fc inj_fc = {
.fc.copy = feat_copy_cb,
.inject = inject,
};
if (inject->build_ids)
perf_header__set_feat(&session->header,
HEADER_BUILD_ID);
/*
* Keep all buildids when there is unprocessed AUX data because
* it is not known which ones the AUX trace hits.
*/
if (perf_header__has_feat(&session->header, HEADER_BUILD_ID) &&
inject->have_auxtrace && !inject->itrace_synth_opts.set)
perf_session__dsos_hit_all(session);
/*
* The AUX areas have been removed and replaced with
* synthesized hardware events, so clear the feature flag.
*/
if (inject->itrace_synth_opts.set) {
perf_header__clear_feat(&session->header,
HEADER_AUXTRACE);
if (inject->itrace_synth_opts.last_branch ||
inject->itrace_synth_opts.add_last_branch)
perf_header__set_feat(&session->header,
HEADER_BRANCH_STACK);
}
session->header.data_offset = output_data_offset;
session->header.data_size = inject->bytes_written;
perf_session__inject_header(session, session->evlist, fd, &inj_fc.fc);
if (inject->copy_kcore_dir) {
ret = copy_kcore_dir(inject);
if (ret) {
pr_err("Failed to copy kcore\n");
return ret;
}
}
if (gs->copy_kcore_dir) {
ret = guest_session__copy_kcore_dir(gs);
if (ret) {
pr_err("Failed to copy guest kcore\n");
return ret;
}
}
}
return ret;
}
int cmd_inject(int argc, const char **argv)
{
struct perf_inject inject = {
.tool = {
.sample = perf_event__repipe_sample,
.read = perf_event__repipe_sample,
.mmap = perf_event__repipe,
.mmap2 = perf_event__repipe,
.comm = perf_event__repipe,
.namespaces = perf_event__repipe,
.cgroup = perf_event__repipe,
.fork = perf_event__repipe,
.exit = perf_event__repipe,
.lost = perf_event__repipe,
.lost_samples = perf_event__repipe,
.aux = perf_event__repipe,
.itrace_start = perf_event__repipe,
.aux_output_hw_id = perf_event__repipe,
.context_switch = perf_event__repipe,
.throttle = perf_event__repipe,
.unthrottle = perf_event__repipe,
.ksymbol = perf_event__repipe,
.bpf = perf_event__repipe,
.text_poke = perf_event__repipe,
.attr = perf_event__repipe_attr,
.event_update = perf_event__repipe_event_update,
.tracing_data = perf_event__repipe_op2_synth,
.finished_round = perf_event__repipe_oe_synth,
.build_id = perf_event__repipe_op2_synth,
.id_index = perf_event__repipe_op2_synth,
.auxtrace_info = perf_event__repipe_op2_synth,
.auxtrace_error = perf_event__repipe_op2_synth,
.time_conv = perf_event__repipe_op2_synth,
.thread_map = perf_event__repipe_op2_synth,
.cpu_map = perf_event__repipe_op2_synth,
.stat_config = perf_event__repipe_op2_synth,
.stat = perf_event__repipe_op2_synth,
.stat_round = perf_event__repipe_op2_synth,
.feature = perf_event__repipe_op2_synth,
.finished_init = perf_event__repipe_op2_synth,
.compressed = perf_event__repipe_op4_synth,
.auxtrace = perf_event__repipe_auxtrace,
},
.input_name = "-",
.samples = LIST_HEAD_INIT(inject.samples),
.output = {
.path = "-",
.mode = PERF_DATA_MODE_WRITE,
.use_stdio = true,
},
};
struct perf_data data = {
.mode = PERF_DATA_MODE_READ,
.use_stdio = true,
};
int ret;
bool repipe = true;
const char *known_build_ids = NULL;
struct option options[] = {
OPT_BOOLEAN('b', "build-ids", &inject.build_ids,
"Inject build-ids into the output stream"),
OPT_BOOLEAN(0, "buildid-all", &inject.build_id_all,
"Inject build-ids of all DSOs into the output stream"),
OPT_STRING(0, "known-build-ids", &known_build_ids,
"buildid path [,buildid path...]",
"build-ids to use for given paths"),
OPT_STRING('i', "input", &inject.input_name, "file",
"input file name"),
OPT_STRING('o', "output", &inject.output.path, "file",
"output file name"),
OPT_BOOLEAN('s', "sched-stat", &inject.sched_stat,
"Merge sched-stat and sched-switch for getting events "
"where and how long tasks slept"),
#ifdef HAVE_JITDUMP
OPT_BOOLEAN('j', "jit", &inject.jit_mode, "merge jitdump files into perf.data file"),
#endif
OPT_INCR('v', "verbose", &verbose,
"be more verbose (show build ids, etc)"),
OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
"file", "vmlinux pathname"),
OPT_BOOLEAN(0, "ignore-vmlinux", &symbol_conf.ignore_vmlinux,
"don't load vmlinux even if found"),
OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name, "file",
"kallsyms pathname"),
OPT_BOOLEAN('f', "force", &data.force, "don't complain, do it"),
OPT_CALLBACK_OPTARG(0, "itrace", &inject.itrace_synth_opts,
NULL, "opts", "Instruction Tracing options\n"
ITRACE_HELP,
itrace_parse_synth_opts),
OPT_BOOLEAN(0, "strip", &inject.strip,
"strip non-synthesized events (use with --itrace)"),
OPT_CALLBACK_OPTARG(0, "vm-time-correlation", &inject, NULL, "opts",
"correlate time between VM guests and the host",
parse_vm_time_correlation),
OPT_CALLBACK_OPTARG(0, "guest-data", &inject, NULL, "opts",
"inject events from a guest perf.data file",
parse_guest_data),
OPT_STRING(0, "guestmount", &symbol_conf.guestmount, "directory",
"guest mount directory under which every guest os"
" instance has a subdir"),
OPT_END()
};
const char * const inject_usage[] = {
"perf inject [<options>]",
NULL
};
if (!inject.itrace_synth_opts.set) {
/* Disable eager loading of kernel symbols that adds overhead to perf inject. */
symbol_conf.lazy_load_kernel_maps = true;
}
#ifndef HAVE_JITDUMP
set_option_nobuild(options, 'j', "jit", "NO_LIBELF=1", true);
#endif
argc = parse_options(argc, argv, options, inject_usage, 0);
/*
* Any (unrecognized) arguments left?
*/
if (argc)
usage_with_options(inject_usage, options);
if (inject.strip && !inject.itrace_synth_opts.set) {
pr_err("--strip option requires --itrace option\n");
return -1;
}
if (symbol__validate_sym_arguments())
return -1;
if (inject.in_place_update) {
if (!strcmp(inject.input_name, "-")) {
pr_err("Input file name required for in-place updating\n");
return -1;
}
if (strcmp(inject.output.path, "-")) {
pr_err("Output file name must not be specified for in-place updating\n");
return -1;
}
if (!data.force && !inject.in_place_update_dry_run) {
pr_err("The input file would be updated in place, "
"the --force option is required.\n");
return -1;
}
if (!inject.in_place_update_dry_run)
data.in_place_update = true;
} else {
if (strcmp(inject.output.path, "-") && !inject.strip &&
has_kcore_dir(inject.input_name)) {
inject.output.is_dir = true;
inject.copy_kcore_dir = true;
}
if (perf_data__open(&inject.output)) {
perror("failed to create output file");
return -1;
}
}
data.path = inject.input_name;
if (!strcmp(inject.input_name, "-") || inject.output.is_pipe) {
inject.is_pipe = true;
/*
* Do not repipe header when input is a regular file
* since either it can rewrite the header at the end
* or write a new pipe header.
*/
if (strcmp(inject.input_name, "-"))
repipe = false;
}
inject.session = __perf_session__new(&data, repipe,
output_fd(&inject),
&inject.tool);
if (IS_ERR(inject.session)) {
ret = PTR_ERR(inject.session);
goto out_close_output;
}
if (zstd_init(&(inject.session->zstd_data), 0) < 0)
pr_warning("Decompression initialization failed.\n");
/* Save original section info before feature bits change */
ret = save_section_info(&inject);
if (ret)
goto out_delete;
if (!data.is_pipe && inject.output.is_pipe) {
ret = perf_header__write_pipe(perf_data__fd(&inject.output));
if (ret < 0) {
pr_err("Couldn't write a new pipe header.\n");
goto out_delete;
}
ret = perf_event__synthesize_for_pipe(&inject.tool,
inject.session,
&inject.output,
perf_event__repipe);
if (ret < 0)
goto out_delete;
}
if (inject.build_ids && !inject.build_id_all) {
/*
* to make sure the mmap records are ordered correctly
* and so that the correct especially due to jitted code
* mmaps. We cannot generate the buildid hit list and
* inject the jit mmaps at the same time for now.
*/
inject.tool.ordered_events = true;
inject.tool.ordering_requires_timestamps = true;
if (known_build_ids != NULL) {
inject.known_build_ids =
perf_inject__parse_known_build_ids(known_build_ids);
if (inject.known_build_ids == NULL) {
pr_err("Couldn't parse known build ids.\n");
goto out_delete;
}
}
}
if (inject.sched_stat) {
inject.tool.ordered_events = true;
}
#ifdef HAVE_JITDUMP
if (inject.jit_mode) {
inject.tool.mmap2 = perf_event__jit_repipe_mmap2;
inject.tool.mmap = perf_event__jit_repipe_mmap;
inject.tool.ordered_events = true;
inject.tool.ordering_requires_timestamps = true;
/*
* JIT MMAP injection injects all MMAP events in one go, so it
* does not obey finished_round semantics.
*/
inject.tool.finished_round = perf_event__drop_oe;
}
#endif
ret = symbol__init(&inject.session->header.env);
if (ret < 0)
goto out_delete;
ret = __cmd_inject(&inject);
guest_session__exit(&inject.guest_session);
out_delete:
strlist__delete(inject.known_build_ids);
zstd_fini(&(inject.session->zstd_data));
perf_session__delete(inject.session);
out_close_output:
if (!inject.in_place_update)
perf_data__close(&inject.output);
free(inject.itrace_synth_opts.vm_tm_corr_args);
free(inject.event_copy);
free(inject.guest_session.ev.event_buf);
return ret;
}
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