builtin-inject.c

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// 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 "perf.h"
#include "util/color.h"
#include "util/evlist.h"
#include "util/evsel.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/thread.h"

#include <subcmd/parse-options.h>

#include <linux/list.h>
#include <errno.h>
#include <signal.h>

struct perf_inject {
    struct perf_tool    tool;
    struct perf_session *session;
    bool            build_ids;
    bool            sched_stat;
    bool            have_auxtrace;
    bool            strip;
    bool            jit_mode;
    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;
};

struct event_entry {
    struct list_head node;
    u32      tid;
    union perf_event event[0];
};

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_tool *tool,
                    union perf_event *event,
                    struct perf_session *session
                    __maybe_unused)
{
    return perf_event__repipe_synth(tool, event);
}

static int perf_event__repipe_attr(struct perf_tool *tool,
                   union perf_event *event,
                   struct perf_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->output.is_pipe)
        return 0;

    return perf_event__repipe_synth(tool, event);
}

#ifdef HAVE_AUXTRACE_SUPPORT

static int copy_bytes(struct perf_inject *inject, int fd, off_t size)
{
    char buf[4096];
    ssize_t ssz;
    int ret;

    while (size > 0) {
        ssz = read(fd, 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_tool *tool,
                       union perf_event *event,
                       struct perf_session *session)
{
    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, perf_data__fd(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_tool *tool __maybe_unused,
                union perf_event *event __maybe_unused,
                struct perf_session *session __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;
}

typedef int (*inject_handler)(struct perf_tool *tool,
                  union perf_event *event,
                  struct perf_sample *sample,
                  struct perf_evsel *evsel,
                  struct machine *machine);

static int perf_event__repipe_sample(struct perf_tool *tool,
                     union perf_event *event,
                     struct perf_sample *sample,
                     struct perf_evsel *evsel,
                     struct machine *machine)
{
    if (evsel->handler) {
        inject_handler f = evsel->handler;
        return f(tool, event, sample, evsel, machine);
    }

    build_id__mark_dso_hit(tool, event, sample, evsel, machine);

    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, sample->pid, &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 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);

    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, sample->pid, &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_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;
}

static int perf_event__repipe_tracing_data(struct perf_tool *tool,
                       union perf_event *event,
                       struct perf_session *session)
{
    int err;

    perf_event__repipe_synth(tool, event);
    err = perf_event__process_tracing_data(tool, event, session);

    return err;
}

static int perf_event__repipe_id_index(struct perf_tool *tool,
                       union perf_event *event,
                       struct perf_session *session)
{
    int err;

    perf_event__repipe_synth(tool, event);
    err = perf_event__process_id_index(tool, event, session);

    return err;
}

static int dso__read_build_id(struct dso *dso)
{
    if (dso->has_build_id)
        return 0;

    if (filename__read_build_id(dso->long_name, dso->build_id,
                    sizeof(dso->build_id)) > 0) {
        dso->has_build_id = true;
        return 0;
    }

    return -1;
}

static int dso__inject_build_id(struct dso *dso, struct perf_tool *tool,
                struct machine *machine)
{
    u16 misc = PERF_RECORD_MISC_USER;
    int err;

    if (dso__read_build_id(dso) < 0) {
        pr_debug("no build_id found for %s\n", dso->long_name);
        return -1;
    }

    if (dso->kernel)
        misc = PERF_RECORD_MISC_KERNEL;

    err = perf_event__synthesize_build_id(tool, dso, misc, perf_event__repipe,
                          machine);
    if (err) {
        pr_err("Can't synthesize build_id event for %s\n", dso->long_name);
        return -1;
    }

    return 0;
}

static int perf_event__inject_buildid(struct perf_tool *tool,
                      union perf_event *event,
                      struct perf_sample *sample,
                      struct perf_evsel *evsel __maybe_unused,
                      struct machine *machine)
{
    struct addr_location al;
    struct thread *thread;

    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)) {
        if (!al.map->dso->hit) {
            al.map->dso->hit = 1;
            if (map__load(al.map) >= 0) {
                dso__inject_build_id(al.map->dso, tool, machine);
                /*
                 * If this fails, too bad, let the other side
                 * account this as unresolved.
                 */
            } else {
#ifdef HAVE_LIBELF_SUPPORT
                pr_warning("no symbols found in %s, maybe "
                       "install a debug package?\n",
                       al.map->dso->long_name);
#endif
            }
        }
    }

    thread__put(thread);
repipe:
    perf_event__repipe(tool, event, sample, machine);
    return 0;
}

static int perf_inject__sched_process_exit(struct perf_tool *tool,
                       union perf_event *event __maybe_unused,
                       struct perf_sample *sample,
                       struct perf_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 perf_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;
}

static int perf_inject__sched_stat(struct perf_tool *tool,
                   union perf_event *event __maybe_unused,
                   struct perf_sample *sample,
                   struct perf_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 = perf_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];
    perf_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->attr.sample_type,
                      evsel->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);
}

static void sig_handler(int sig __maybe_unused)
{
    session_done = 1;
}

static int perf_evsel__check_stype(struct perf_evsel *evsel,
                   u64 sample_type, const char *sample_msg)
{
    struct perf_event_attr *attr = &evsel->attr;
    const char *name = perf_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 perf_evsel *evsel __maybe_unused,
               struct machine *machine __maybe_unused)
{
    return 0;
}

static void strip_init(struct perf_inject *inject)
{
    struct perf_evlist *evlist = inject->session->evlist;
    struct perf_evsel *evsel;

    inject->tool.context_switch = perf_event__drop;

    evlist__for_each_entry(evlist, evsel)
        evsel->handler = drop_sample;
}

static bool has_tracking(struct perf_evsel *evsel)
{
    return evsel->attr.mmap || evsel->attr.mmap2 || evsel->attr.comm ||
           evsel->attr.task;
}

#define COMPAT_MASK (PERF_SAMPLE_ID | PERF_SAMPLE_TID | PERF_SAMPLE_TIME | \
             PERF_SAMPLE_ID | PERF_SAMPLE_CPU | PERF_SAMPLE_IDENTIFIER)

/*
 * In order that the perf.data file is parsable, tracking events like MMAP need
 * their selected event to exist, except if there is only 1 selected event left
 * and it has a compatible sample type.
 */
static bool ok_to_remove(struct perf_evlist *evlist,
             struct perf_evsel *evsel_to_remove)
{
    struct perf_evsel *evsel;
    int cnt = 0;
    bool ok = false;

    if (!has_tracking(evsel_to_remove))
        return true;

    evlist__for_each_entry(evlist, evsel) {
        if (evsel->handler != drop_sample) {
            cnt += 1;
            if ((evsel->attr.sample_type & COMPAT_MASK) ==
                (evsel_to_remove->attr.sample_type & COMPAT_MASK))
                ok = true;
        }
    }

    return ok && cnt == 1;
}

static void strip_fini(struct perf_inject *inject)
{
    struct perf_evlist *evlist = inject->session->evlist;
    struct perf_evsel *evsel, *tmp;

    /* Remove non-synthesized evsels if possible */
    evlist__for_each_entry_safe(evlist, tmp, evsel) {
        if (evsel->handler == drop_sample &&
            ok_to_remove(evlist, evsel)) {
            pr_debug("Deleting %s\n", perf_evsel__name(evsel));
            perf_evlist__remove(evlist, evsel);
            perf_evsel__delete(evsel);
        }
    }
}

static int __cmd_inject(struct perf_inject *inject)
{
    int ret = -EINVAL;
    struct perf_session *session = inject->session;
    struct perf_data *data_out = &inject->output;
    int fd = perf_data__fd(data_out);
    u64 output_data_offset;

    signal(SIGINT, sig_handler);

    if (inject->build_ids || inject->sched_stat ||
        inject->itrace_synth_opts.set) {
        inject->tool.mmap     = perf_event__repipe_mmap;
        inject->tool.mmap2    = perf_event__repipe_mmap2;
        inject->tool.fork     = perf_event__repipe_fork;
        inject->tool.tracing_data = perf_event__repipe_tracing_data;
    }

    output_data_offset = session->header.data_offset;

    if (inject->build_ids) {
        inject->tool.sample = perf_event__inject_buildid;
    } else if (inject->sched_stat) {
        struct perf_evsel *evsel;

        evlist__for_each_entry(session->evlist, evsel) {
            const char *name = perf_evsel__name(evsel);

            if (!strcmp(name, "sched:sched_switch")) {
                if (perf_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;
            else if (!strncmp(name, "sched:sched_stat_", 17))
                evsel->handler = perf_inject__sched_stat;
        }
    } 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__repipe_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.ordered_events = true;
        inject->tool.ordering_requires_timestamps = true;
        /* Allow space in the header for new attributes */
        output_data_offset = 4096;
        if (inject->strip)
            strip_init(inject);
    }

    if (!inject->itrace_synth_opts.set)
        auxtrace_index__free(&session->auxtrace_index);

    if (!data_out->is_pipe)
        lseek(fd, output_data_offset, SEEK_SET);

    ret = perf_session__process_events(session);
    if (ret)
        return ret;

    if (!data_out->is_pipe) {
        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)
            dsos__hit_all(session);
        /*
         * The AUX areas have been removed and replaced with
         * synthesized hardware events, so clear the feature flag and
         * remove the evsel.
         */
        if (inject->itrace_synth_opts.set) {
            struct perf_evsel *evsel;

            perf_header__clear_feat(&session->header,
                        HEADER_AUXTRACE);
            if (inject->itrace_synth_opts.last_branch)
                perf_header__set_feat(&session->header,
                              HEADER_BRANCH_STACK);
            evsel = perf_evlist__id2evsel_strict(session->evlist,
                                 inject->aux_id);
            if (evsel) {
                pr_debug("Deleting %s\n",
                     perf_evsel__name(evsel));
                perf_evlist__remove(session->evlist, evsel);
                perf_evsel__delete(evsel);
            }
            if (inject->strip)
                strip_fini(inject);
        }
        session->header.data_offset = output_data_offset;
        session->header.data_size = inject->bytes_written;
        perf_session__write_header(session, session->evlist, fd, true);
    }

    return ret;
}

int cmd_inject(int argc, const char **argv)
{
    struct perf_inject inject = {
        .tool = {
            .sample     = perf_event__repipe_sample,
            .mmap       = perf_event__repipe,
            .mmap2      = perf_event__repipe,
            .comm       = 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,
            .context_switch = perf_event__repipe,
            .read       = perf_event__repipe_sample,
            .throttle   = perf_event__repipe,
            .unthrottle = perf_event__repipe,
            .attr       = perf_event__repipe_attr,
            .tracing_data   = perf_event__repipe_op2_synth,
            .auxtrace_info  = perf_event__repipe_op2_synth,
            .auxtrace   = perf_event__repipe_auxtrace,
            .auxtrace_error = perf_event__repipe_op2_synth,
            .time_conv  = 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,
            .feature    = perf_event__repipe_op2_synth,
        },
        .input_name  = "-",
        .samples = LIST_HEAD_INIT(inject.samples),
        .output = {
            .file      = {
                .path = "-",
            },
            .mode      = PERF_DATA_MODE_WRITE,
        },
    };
    struct perf_data data = {
        .mode = PERF_DATA_MODE_READ,
    };
    int ret;

    struct option options[] = {
        OPT_BOOLEAN('b', "build-ids", &inject.build_ids,
                "Inject build-ids into the output stream"),
        OPT_STRING('i', "input", &inject.input_name, "file",
               "input file name"),
        OPT_STRING('o', "output", &inject.output.file.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(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",
                    itrace_parse_synth_opts),
        OPT_BOOLEAN(0, "strip", &inject.strip,
                "strip non-synthesized events (use with --itrace)"),
        OPT_END()
    };
    const char * const inject_usage[] = {
        "perf inject [<options>]",
        NULL
    };
#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 (perf_data__open(&inject.output)) {
        perror("failed to create output file");
        return -1;
    }

    inject.tool.ordered_events = inject.sched_stat;

    data.file.path = inject.input_name;
    inject.session = perf_session__new(&data, true, &inject.tool);
    if (inject.session == NULL)
        return -1;

    if (inject.build_ids) {
        /*
         * 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;
    }
#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);

out_delete:
    perf_session__delete(inject.session);
    return ret;
}