trace-event-parse.c

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/*
 * Copyright (C) 2009, Steven Rostedt <srostedt@redhat.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License (not later!)
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#include "../perf.h"
#include "debug.h"
#include "trace-event.h"

#include "sane_ctype.h"

static int get_common_field(struct scripting_context *context,
                int *offset, int *size, const char *type)
{
    struct pevent *pevent = context->pevent;
    struct event_format *event;
    struct format_field *field;

    if (!*size) {
        if (!pevent->events)
            return 0;

        event = pevent->events[0];
        field = pevent_find_common_field(event, type);
        if (!field)
            return 0;
        *offset = field->offset;
        *size = field->size;
    }

    return pevent_read_number(pevent, context->event_data + *offset, *size);
}

int common_lock_depth(struct scripting_context *context)
{
    static int offset;
    static int size;
    int ret;

    ret = get_common_field(context, &size, &offset,
                   "common_lock_depth");
    if (ret < 0)
        return -1;

    return ret;
}

int common_flags(struct scripting_context *context)
{
    static int offset;
    static int size;
    int ret;

    ret = get_common_field(context, &size, &offset,
                   "common_flags");
    if (ret < 0)
        return -1;

    return ret;
}

int common_pc(struct scripting_context *context)
{
    static int offset;
    static int size;
    int ret;

    ret = get_common_field(context, &size, &offset,
                   "common_preempt_count");
    if (ret < 0)
        return -1;

    return ret;
}

unsigned long long
raw_field_value(struct event_format *event, const char *name, void *data)
{
    struct format_field *field;
    unsigned long long val;

    field = pevent_find_any_field(event, name);
    if (!field)
        return 0ULL;

    pevent_read_number_field(field, data, &val);

    return val;
}

unsigned long long read_size(struct event_format *event, void *ptr, int size)
{
    return pevent_read_number(event->pevent, ptr, size);
}

void event_format__fprintf(struct event_format *event,
               int cpu, void *data, int size, FILE *fp)
{
    struct pevent_record record;
    struct trace_seq s;

    memset(&record, 0, sizeof(record));
    record.cpu = cpu;
    record.size = size;
    record.data = data;

    trace_seq_init(&s);
    pevent_event_info(&s, event, &record);
    trace_seq_do_fprintf(&s, fp);
    trace_seq_destroy(&s);
}

void event_format__print(struct event_format *event,
             int cpu, void *data, int size)
{
    return event_format__fprintf(event, cpu, data, size, stdout);
}

void parse_ftrace_printk(struct pevent *pevent,
             char *file, unsigned int size __maybe_unused)
{
    unsigned long long addr;
    char *printk;
    char *line;
    char *next = NULL;
    char *addr_str;
    char *fmt = NULL;

    line = strtok_r(file, "\n", &next);
    while (line) {
        addr_str = strtok_r(line, ":", &fmt);
        if (!addr_str) {
            pr_warning("printk format with empty entry");
            break;
        }
        addr = strtoull(addr_str, NULL, 16);
        /* fmt still has a space, skip it */
        printk = strdup(fmt+1);
        line = strtok_r(NULL, "\n", &next);
        pevent_register_print_string(pevent, printk, addr);
    }
}

void parse_saved_cmdline(struct pevent *pevent,
             char *file, unsigned int size __maybe_unused)
{
    char *comm;
    char *line;
    char *next = NULL;
    int pid;

    line = strtok_r(file, "\n", &next);
    while (line) {
        sscanf(line, "%d %ms", &pid, &comm);
        pevent_register_comm(pevent, comm, pid);
        free(comm);
        line = strtok_r(NULL, "\n", &next);
    }
}

int parse_ftrace_file(struct pevent *pevent, char *buf, unsigned long size)
{
    return pevent_parse_event(pevent, buf, size, "ftrace");
}

int parse_event_file(struct pevent *pevent,
             char *buf, unsigned long size, char *sys)
{
    return pevent_parse_event(pevent, buf, size, sys);
}

struct event_format *trace_find_next_event(struct pevent *pevent,
                       struct event_format *event)
{
    static int idx;

    if (!pevent || !pevent->events)
        return NULL;

    if (!event) {
        idx = 0;
        return pevent->events[0];
    }

    if (idx < pevent->nr_events && event == pevent->events[idx]) {
        idx++;
        if (idx == pevent->nr_events)
            return NULL;
        return pevent->events[idx];
    }

    for (idx = 1; idx < pevent->nr_events; idx++) {
        if (event == pevent->events[idx - 1])
            return pevent->events[idx];
    }
    return NULL;
}

struct flag {
    const char *name;
    unsigned long long value;
};

static const struct flag flags[] = {
    { "HI_SOFTIRQ", 0 },
    { "TIMER_SOFTIRQ", 1 },
    { "NET_TX_SOFTIRQ", 2 },
    { "NET_RX_SOFTIRQ", 3 },
    { "BLOCK_SOFTIRQ", 4 },
    { "IRQ_POLL_SOFTIRQ", 5 },
    { "TASKLET_SOFTIRQ", 6 },
    { "SCHED_SOFTIRQ", 7 },
    { "HRTIMER_SOFTIRQ", 8 },
    { "RCU_SOFTIRQ", 9 },

    { "HRTIMER_NORESTART", 0 },
    { "HRTIMER_RESTART", 1 },
};

unsigned long long eval_flag(const char *flag)
{
    int i;

    /*
     * Some flags in the format files do not get converted.
     * If the flag is not numeric, see if it is something that
     * we already know about.
     */
    if (isdigit(flag[0]))
        return strtoull(flag, NULL, 0);

    for (i = 0; i < (int)(sizeof(flags)/sizeof(flags[0])); i++)
        if (strcmp(flags[i].name, flag) == 0)
            return flags[i].value;

    return 0;
}