// SPDX-License-Identifier: GPL-2.0
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/*
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* trace_output.c
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*
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* Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
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*
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*/
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/ftrace.h>
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#include <linux/sched/clock.h>
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#include <linux/sched/mm.h>
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#include "trace_output.h"
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/* must be a power of 2 */
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#define EVENT_HASHSIZE 128
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DECLARE_RWSEM(trace_event_sem);
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static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
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static int next_event_type = __TRACE_LAST_TYPE;
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enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
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{
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struct trace_seq *s = &iter->seq;
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struct trace_entry *entry = iter->ent;
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struct bputs_entry *field;
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trace_assign_type(field, entry);
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trace_seq_puts(s, field->str);
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return trace_handle_return(s);
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}
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enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
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{
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struct trace_seq *s = &iter->seq;
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struct trace_entry *entry = iter->ent;
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struct bprint_entry *field;
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trace_assign_type(field, entry);
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trace_seq_bprintf(s, field->fmt, field->buf);
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return trace_handle_return(s);
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}
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enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
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{
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struct trace_seq *s = &iter->seq;
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struct trace_entry *entry = iter->ent;
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struct print_entry *field;
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trace_assign_type(field, entry);
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trace_seq_puts(s, field->buf);
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return trace_handle_return(s);
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}
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const char *
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trace_print_flags_seq(struct trace_seq *p, const char *delim,
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unsigned long flags,
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const struct trace_print_flags *flag_array)
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{
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unsigned long mask;
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const char *str;
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const char *ret = trace_seq_buffer_ptr(p);
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int i, first = 1;
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for (i = 0; flag_array[i].name && flags; i++) {
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mask = flag_array[i].mask;
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if ((flags & mask) != mask)
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continue;
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str = flag_array[i].name;
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flags &= ~mask;
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if (!first && delim)
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trace_seq_puts(p, delim);
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else
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first = 0;
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trace_seq_puts(p, str);
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}
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/* check for left over flags */
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if (flags) {
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if (!first && delim)
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trace_seq_puts(p, delim);
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trace_seq_printf(p, "0x%lx", flags);
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}
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trace_seq_putc(p, 0);
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return ret;
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}
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EXPORT_SYMBOL(trace_print_flags_seq);
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const char *
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trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
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const struct trace_print_flags *symbol_array)
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{
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int i;
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const char *ret = trace_seq_buffer_ptr(p);
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for (i = 0; symbol_array[i].name; i++) {
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if (val != symbol_array[i].mask)
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continue;
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trace_seq_puts(p, symbol_array[i].name);
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break;
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}
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if (ret == (const char *)(trace_seq_buffer_ptr(p)))
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trace_seq_printf(p, "0x%lx", val);
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trace_seq_putc(p, 0);
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return ret;
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}
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EXPORT_SYMBOL(trace_print_symbols_seq);
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#if BITS_PER_LONG == 32
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const char *
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trace_print_flags_seq_u64(struct trace_seq *p, const char *delim,
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unsigned long long flags,
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const struct trace_print_flags_u64 *flag_array)
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{
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unsigned long long mask;
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const char *str;
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const char *ret = trace_seq_buffer_ptr(p);
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int i, first = 1;
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for (i = 0; flag_array[i].name && flags; i++) {
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mask = flag_array[i].mask;
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if ((flags & mask) != mask)
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continue;
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str = flag_array[i].name;
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flags &= ~mask;
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if (!first && delim)
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trace_seq_puts(p, delim);
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else
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first = 0;
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trace_seq_puts(p, str);
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}
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/* check for left over flags */
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if (flags) {
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if (!first && delim)
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trace_seq_puts(p, delim);
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trace_seq_printf(p, "0x%llx", flags);
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}
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trace_seq_putc(p, 0);
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return ret;
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}
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EXPORT_SYMBOL(trace_print_flags_seq_u64);
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const char *
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trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
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const struct trace_print_flags_u64 *symbol_array)
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{
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int i;
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const char *ret = trace_seq_buffer_ptr(p);
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for (i = 0; symbol_array[i].name; i++) {
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if (val != symbol_array[i].mask)
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continue;
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trace_seq_puts(p, symbol_array[i].name);
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break;
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}
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if (ret == (const char *)(trace_seq_buffer_ptr(p)))
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trace_seq_printf(p, "0x%llx", val);
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trace_seq_putc(p, 0);
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return ret;
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}
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EXPORT_SYMBOL(trace_print_symbols_seq_u64);
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#endif
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const char *
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trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
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unsigned int bitmask_size)
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{
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const char *ret = trace_seq_buffer_ptr(p);
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trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
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trace_seq_putc(p, 0);
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return ret;
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}
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EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
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/**
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* trace_print_hex_seq - print buffer as hex sequence
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* @p: trace seq struct to write to
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* @buf: The buffer to print
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* @buf_len: Length of @buf in bytes
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* @concatenate: Print @buf as single hex string or with spacing
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*
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* Prints the passed buffer as a hex sequence either as a whole,
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* single hex string if @concatenate is true or with spacing after
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* each byte in case @concatenate is false.
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*/
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const char *
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trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len,
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bool concatenate)
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{
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int i;
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const char *ret = trace_seq_buffer_ptr(p);
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const char *fmt = concatenate ? "%*phN" : "%*ph";
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for (i = 0; i < buf_len; i += 16)
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trace_seq_printf(p, fmt, min(buf_len - i, 16), &buf[i]);
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trace_seq_putc(p, 0);
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return ret;
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}
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EXPORT_SYMBOL(trace_print_hex_seq);
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const char *
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trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
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size_t el_size)
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{
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const char *ret = trace_seq_buffer_ptr(p);
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const char *prefix = "";
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void *ptr = (void *)buf;
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size_t buf_len = count * el_size;
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trace_seq_putc(p, '{');
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while (ptr < buf + buf_len) {
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switch (el_size) {
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case 1:
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trace_seq_printf(p, "%s0x%x", prefix,
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*(u8 *)ptr);
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break;
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case 2:
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trace_seq_printf(p, "%s0x%x", prefix,
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*(u16 *)ptr);
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break;
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case 4:
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trace_seq_printf(p, "%s0x%x", prefix,
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*(u32 *)ptr);
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break;
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case 8:
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trace_seq_printf(p, "%s0x%llx", prefix,
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*(u64 *)ptr);
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break;
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default:
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trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
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*(u8 *)ptr);
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el_size = 1;
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}
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prefix = ",";
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ptr += el_size;
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}
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trace_seq_putc(p, '}');
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trace_seq_putc(p, 0);
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return ret;
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}
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EXPORT_SYMBOL(trace_print_array_seq);
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const char *
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trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str,
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int prefix_type, int rowsize, int groupsize,
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const void *buf, size_t len, bool ascii)
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{
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const char *ret = trace_seq_buffer_ptr(p);
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trace_seq_putc(p, '\n');
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trace_seq_hex_dump(p, prefix_str, prefix_type,
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rowsize, groupsize, buf, len, ascii);
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trace_seq_putc(p, 0);
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return ret;
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}
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EXPORT_SYMBOL(trace_print_hex_dump_seq);
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int trace_raw_output_prep(struct trace_iterator *iter,
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struct trace_event *trace_event)
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{
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struct trace_event_call *event;
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struct trace_seq *s = &iter->seq;
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struct trace_seq *p = &iter->tmp_seq;
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struct trace_entry *entry;
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event = container_of(trace_event, struct trace_event_call, event);
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entry = iter->ent;
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if (entry->type != event->event.type) {
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WARN_ON_ONCE(1);
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return TRACE_TYPE_UNHANDLED;
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}
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trace_seq_init(p);
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trace_seq_printf(s, "%s: ", trace_event_name(event));
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return trace_handle_return(s);
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}
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EXPORT_SYMBOL(trace_raw_output_prep);
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static int trace_output_raw(struct trace_iterator *iter, char *name,
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char *fmt, va_list ap)
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{
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struct trace_seq *s = &iter->seq;
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trace_seq_printf(s, "%s: ", name);
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trace_seq_vprintf(s, fmt, ap);
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return trace_handle_return(s);
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}
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int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
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{
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va_list ap;
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int ret;
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va_start(ap, fmt);
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ret = trace_output_raw(iter, name, fmt, ap);
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va_end(ap);
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return ret;
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}
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EXPORT_SYMBOL_GPL(trace_output_call);
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#ifdef CONFIG_KRETPROBES
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static inline const char *kretprobed(const char *name)
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{
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static const char tramp_name[] = "kretprobe_trampoline";
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int size = sizeof(tramp_name);
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if (strncmp(tramp_name, name, size) == 0)
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return "[unknown/kretprobe'd]";
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return name;
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}
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#else
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static inline const char *kretprobed(const char *name)
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{
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return name;
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}
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#endif /* CONFIG_KRETPROBES */
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static void
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seq_print_sym(struct trace_seq *s, unsigned long address, bool offset)
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{
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#ifdef CONFIG_KALLSYMS
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char str[KSYM_SYMBOL_LEN];
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const char *name;
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if (offset)
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sprint_symbol(str, address);
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else
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kallsyms_lookup(address, NULL, NULL, NULL, str);
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name = kretprobed(str);
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if (name && strlen(name)) {
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trace_seq_puts(s, name);
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return;
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}
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#endif
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trace_seq_printf(s, "0x%08lx", address);
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}
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#ifndef CONFIG_64BIT
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# define IP_FMT "%08lx"
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#else
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# define IP_FMT "%016lx"
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#endif
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static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
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unsigned long ip, unsigned long sym_flags)
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{
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struct file *file = NULL;
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unsigned long vmstart = 0;
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int ret = 1;
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if (s->full)
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return 0;
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if (mm) {
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const struct vm_area_struct *vma;
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mmap_read_lock(mm);
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vma = find_vma(mm, ip);
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if (vma) {
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file = vma->vm_file;
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vmstart = vma->vm_start;
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}
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if (file) {
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ret = trace_seq_path(s, &file->f_path);
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if (ret)
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trace_seq_printf(s, "[+0x%lx]",
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ip - vmstart);
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}
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mmap_read_unlock(mm);
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}
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if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
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trace_seq_printf(s, " <" IP_FMT ">", ip);
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return !trace_seq_has_overflowed(s);
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}
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int
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seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
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{
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if (!ip) {
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trace_seq_putc(s, '0');
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goto out;
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}
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seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET);
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if (sym_flags & TRACE_ITER_SYM_ADDR)
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trace_seq_printf(s, " <" IP_FMT ">", ip);
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out:
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return !trace_seq_has_overflowed(s);
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}
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/**
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* trace_print_lat_fmt - print the irq, preempt and lockdep fields
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* @s: trace seq struct to write to
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* @entry: The trace entry field from the ring buffer
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*
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* Prints the generic fields of irqs off, in hard or softirq, preempt
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* count.
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*/
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int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
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{
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char hardsoft_irq;
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char need_resched;
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char need_resched_lazy;
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char irqs_off;
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int hardirq;
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int softirq;
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int nmi;
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nmi = entry->flags & TRACE_FLAG_NMI;
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hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
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softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
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irqs_off =
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(entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
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(entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
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'.';
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switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
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TRACE_FLAG_PREEMPT_RESCHED)) {
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case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
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need_resched = 'N';
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break;
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case TRACE_FLAG_NEED_RESCHED:
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need_resched = 'n';
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break;
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case TRACE_FLAG_PREEMPT_RESCHED:
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need_resched = 'p';
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break;
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default:
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need_resched = '.';
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break;
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}
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need_resched_lazy =
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(entry->flags & TRACE_FLAG_NEED_RESCHED_LAZY) ? 'L' : '.';
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hardsoft_irq =
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(nmi && hardirq) ? 'Z' :
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nmi ? 'z' :
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(hardirq && softirq) ? 'H' :
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hardirq ? 'h' :
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softirq ? 's' :
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'.' ;
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trace_seq_printf(s, "%c%c%c%c",
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irqs_off, need_resched, need_resched_lazy,
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hardsoft_irq);
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if (entry->preempt_count)
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trace_seq_printf(s, "%x", entry->preempt_count);
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else
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trace_seq_putc(s, '.');
|
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if (entry->preempt_lazy_count)
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trace_seq_printf(s, "%x", entry->preempt_lazy_count);
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else
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trace_seq_putc(s, '.');
|
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if (entry->migrate_disable)
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trace_seq_printf(s, "%x", entry->migrate_disable);
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else
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trace_seq_putc(s, '.');
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return !trace_seq_has_overflowed(s);
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}
|
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static int
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lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
|
{
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char comm[TASK_COMM_LEN];
|
|
trace_find_cmdline(entry->pid, comm);
|
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trace_seq_printf(s, "%8.8s-%-7d %3d",
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comm, entry->pid, cpu);
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return trace_print_lat_fmt(s, entry);
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}
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#undef MARK
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#define MARK(v, s) {.val = v, .sym = s}
|
/* trace overhead mark */
|
static const struct trace_mark {
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unsigned long long val; /* unit: nsec */
|
char sym;
|
} mark[] = {
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MARK(1000000000ULL , '$'), /* 1 sec */
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MARK(100000000ULL , '@'), /* 100 msec */
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MARK(10000000ULL , '*'), /* 10 msec */
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MARK(1000000ULL , '#'), /* 1000 usecs */
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MARK(100000ULL , '!'), /* 100 usecs */
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MARK(10000ULL , '+'), /* 10 usecs */
|
};
|
#undef MARK
|
|
char trace_find_mark(unsigned long long d)
|
{
|
int i;
|
int size = ARRAY_SIZE(mark);
|
|
for (i = 0; i < size; i++) {
|
if (d > mark[i].val)
|
break;
|
}
|
|
return (i == size) ? ' ' : mark[i].sym;
|
}
|
|
static int
|
lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
|
{
|
struct trace_array *tr = iter->tr;
|
unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
|
unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
|
unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start;
|
unsigned long long rel_ts = next_ts - iter->ts;
|
struct trace_seq *s = &iter->seq;
|
|
if (in_ns) {
|
abs_ts = ns2usecs(abs_ts);
|
rel_ts = ns2usecs(rel_ts);
|
}
|
|
if (verbose && in_ns) {
|
unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
|
unsigned long abs_msec = (unsigned long)abs_ts;
|
unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
|
unsigned long rel_msec = (unsigned long)rel_ts;
|
|
trace_seq_printf(
|
s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
|
ns2usecs(iter->ts),
|
abs_msec, abs_usec,
|
rel_msec, rel_usec);
|
|
} else if (verbose && !in_ns) {
|
trace_seq_printf(
|
s, "[%016llx] %lld (+%lld): ",
|
iter->ts, abs_ts, rel_ts);
|
|
} else if (!verbose && in_ns) {
|
trace_seq_printf(
|
s, " %4lldus%c: ",
|
abs_ts,
|
trace_find_mark(rel_ts * NSEC_PER_USEC));
|
|
} else { /* !verbose && !in_ns */
|
trace_seq_printf(s, " %4lld: ", abs_ts);
|
}
|
|
return !trace_seq_has_overflowed(s);
|
}
|
|
int trace_print_context(struct trace_iterator *iter)
|
{
|
struct trace_array *tr = iter->tr;
|
struct trace_seq *s = &iter->seq;
|
struct trace_entry *entry = iter->ent;
|
unsigned long long t;
|
unsigned long secs, usec_rem;
|
char comm[TASK_COMM_LEN];
|
|
trace_find_cmdline(entry->pid, comm);
|
|
trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid);
|
|
if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
|
unsigned int tgid = trace_find_tgid(entry->pid);
|
|
if (!tgid)
|
trace_seq_printf(s, "(-------) ");
|
else
|
trace_seq_printf(s, "(%7d) ", tgid);
|
}
|
|
trace_seq_printf(s, "[%03d] ", iter->cpu);
|
|
if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
|
trace_print_lat_fmt(s, entry);
|
|
if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
|
t = ns2usecs(iter->ts);
|
usec_rem = do_div(t, USEC_PER_SEC);
|
secs = (unsigned long)t;
|
trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
|
} else
|
trace_seq_printf(s, " %12llu: ", iter->ts);
|
|
return !trace_seq_has_overflowed(s);
|
}
|
|
int trace_print_lat_context(struct trace_iterator *iter)
|
{
|
struct trace_entry *entry, *next_entry;
|
struct trace_array *tr = iter->tr;
|
struct trace_seq *s = &iter->seq;
|
unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
|
u64 next_ts;
|
|
next_entry = trace_find_next_entry(iter, NULL, &next_ts);
|
if (!next_entry)
|
next_ts = iter->ts;
|
|
/* trace_find_next_entry() may change iter->ent */
|
entry = iter->ent;
|
|
if (verbose) {
|
char comm[TASK_COMM_LEN];
|
|
trace_find_cmdline(entry->pid, comm);
|
|
trace_seq_printf(
|
s, "%16s %7d %3d %d %08x %08lx ",
|
comm, entry->pid, iter->cpu, entry->flags,
|
entry->preempt_count, iter->idx);
|
} else {
|
lat_print_generic(s, entry, iter->cpu);
|
}
|
|
lat_print_timestamp(iter, next_ts);
|
|
return !trace_seq_has_overflowed(s);
|
}
|
|
/**
|
* ftrace_find_event - find a registered event
|
* @type: the type of event to look for
|
*
|
* Returns an event of type @type otherwise NULL
|
* Called with trace_event_read_lock() held.
|
*/
|
struct trace_event *ftrace_find_event(int type)
|
{
|
struct trace_event *event;
|
unsigned key;
|
|
key = type & (EVENT_HASHSIZE - 1);
|
|
hlist_for_each_entry(event, &event_hash[key], node) {
|
if (event->type == type)
|
return event;
|
}
|
|
return NULL;
|
}
|
|
static LIST_HEAD(ftrace_event_list);
|
|
static int trace_search_list(struct list_head **list)
|
{
|
struct trace_event *e;
|
int next = __TRACE_LAST_TYPE;
|
|
if (list_empty(&ftrace_event_list)) {
|
*list = &ftrace_event_list;
|
return next;
|
}
|
|
/*
|
* We used up all possible max events,
|
* lets see if somebody freed one.
|
*/
|
list_for_each_entry(e, &ftrace_event_list, list) {
|
if (e->type != next)
|
break;
|
next++;
|
}
|
|
/* Did we used up all 65 thousand events??? */
|
if (next > TRACE_EVENT_TYPE_MAX)
|
return 0;
|
|
*list = &e->list;
|
return next;
|
}
|
|
void trace_event_read_lock(void)
|
{
|
down_read(&trace_event_sem);
|
}
|
|
void trace_event_read_unlock(void)
|
{
|
up_read(&trace_event_sem);
|
}
|
|
/**
|
* register_trace_event - register output for an event type
|
* @event: the event type to register
|
*
|
* Event types are stored in a hash and this hash is used to
|
* find a way to print an event. If the @event->type is set
|
* then it will use that type, otherwise it will assign a
|
* type to use.
|
*
|
* If you assign your own type, please make sure it is added
|
* to the trace_type enum in trace.h, to avoid collisions
|
* with the dynamic types.
|
*
|
* Returns the event type number or zero on error.
|
*/
|
int register_trace_event(struct trace_event *event)
|
{
|
unsigned key;
|
int ret = 0;
|
|
down_write(&trace_event_sem);
|
|
if (WARN_ON(!event))
|
goto out;
|
|
if (WARN_ON(!event->funcs))
|
goto out;
|
|
INIT_LIST_HEAD(&event->list);
|
|
if (!event->type) {
|
struct list_head *list = NULL;
|
|
if (next_event_type > TRACE_EVENT_TYPE_MAX) {
|
|
event->type = trace_search_list(&list);
|
if (!event->type)
|
goto out;
|
|
} else {
|
|
event->type = next_event_type++;
|
list = &ftrace_event_list;
|
}
|
|
if (WARN_ON(ftrace_find_event(event->type)))
|
goto out;
|
|
list_add_tail(&event->list, list);
|
|
} else if (event->type > __TRACE_LAST_TYPE) {
|
printk(KERN_WARNING "Need to add type to trace.h\n");
|
WARN_ON(1);
|
goto out;
|
} else {
|
/* Is this event already used */
|
if (ftrace_find_event(event->type))
|
goto out;
|
}
|
|
if (event->funcs->trace == NULL)
|
event->funcs->trace = trace_nop_print;
|
if (event->funcs->raw == NULL)
|
event->funcs->raw = trace_nop_print;
|
if (event->funcs->hex == NULL)
|
event->funcs->hex = trace_nop_print;
|
if (event->funcs->binary == NULL)
|
event->funcs->binary = trace_nop_print;
|
|
key = event->type & (EVENT_HASHSIZE - 1);
|
|
hlist_add_head(&event->node, &event_hash[key]);
|
|
ret = event->type;
|
out:
|
up_write(&trace_event_sem);
|
|
return ret;
|
}
|
EXPORT_SYMBOL_GPL(register_trace_event);
|
|
/*
|
* Used by module code with the trace_event_sem held for write.
|
*/
|
int __unregister_trace_event(struct trace_event *event)
|
{
|
hlist_del(&event->node);
|
list_del(&event->list);
|
return 0;
|
}
|
|
/**
|
* unregister_trace_event - remove a no longer used event
|
* @event: the event to remove
|
*/
|
int unregister_trace_event(struct trace_event *event)
|
{
|
down_write(&trace_event_sem);
|
__unregister_trace_event(event);
|
up_write(&trace_event_sem);
|
|
return 0;
|
}
|
EXPORT_SYMBOL_GPL(unregister_trace_event);
|
|
/*
|
* Standard events
|
*/
|
|
enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
|
struct trace_event *event)
|
{
|
trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
|
|
return trace_handle_return(&iter->seq);
|
}
|
|
/* TRACE_FN */
|
static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
|
struct trace_event *event)
|
{
|
struct ftrace_entry *field;
|
struct trace_seq *s = &iter->seq;
|
|
trace_assign_type(field, iter->ent);
|
|
seq_print_ip_sym(s, field->ip, flags);
|
|
if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
|
trace_seq_puts(s, " <-");
|
seq_print_ip_sym(s, field->parent_ip, flags);
|
}
|
|
trace_seq_putc(s, '\n');
|
|
return trace_handle_return(s);
|
}
|
|
static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
|
struct trace_event *event)
|
{
|
struct ftrace_entry *field;
|
|
trace_assign_type(field, iter->ent);
|
|
trace_seq_printf(&iter->seq, "%lx %lx\n",
|
field->ip,
|
field->parent_ip);
|
|
return trace_handle_return(&iter->seq);
|
}
|
|
static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
|
struct trace_event *event)
|
{
|
struct ftrace_entry *field;
|
struct trace_seq *s = &iter->seq;
|
|
trace_assign_type(field, iter->ent);
|
|
SEQ_PUT_HEX_FIELD(s, field->ip);
|
SEQ_PUT_HEX_FIELD(s, field->parent_ip);
|
|
return trace_handle_return(s);
|
}
|
|
static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
|
struct trace_event *event)
|
{
|
struct ftrace_entry *field;
|
struct trace_seq *s = &iter->seq;
|
|
trace_assign_type(field, iter->ent);
|
|
SEQ_PUT_FIELD(s, field->ip);
|
SEQ_PUT_FIELD(s, field->parent_ip);
|
|
return trace_handle_return(s);
|
}
|
|
static struct trace_event_functions trace_fn_funcs = {
|
.trace = trace_fn_trace,
|
.raw = trace_fn_raw,
|
.hex = trace_fn_hex,
|
.binary = trace_fn_bin,
|
};
|
|
static struct trace_event trace_fn_event = {
|
.type = TRACE_FN,
|
.funcs = &trace_fn_funcs,
|
};
|
|
/* TRACE_CTX an TRACE_WAKE */
|
static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
|
char *delim)
|
{
|
struct ctx_switch_entry *field;
|
char comm[TASK_COMM_LEN];
|
int S, T;
|
|
|
trace_assign_type(field, iter->ent);
|
|
T = task_index_to_char(field->next_state);
|
S = task_index_to_char(field->prev_state);
|
trace_find_cmdline(field->next_pid, comm);
|
trace_seq_printf(&iter->seq,
|
" %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n",
|
field->prev_pid,
|
field->prev_prio,
|
S, delim,
|
field->next_cpu,
|
field->next_pid,
|
field->next_prio,
|
T, comm);
|
|
return trace_handle_return(&iter->seq);
|
}
|
|
static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
|
struct trace_event *event)
|
{
|
return trace_ctxwake_print(iter, "==>");
|
}
|
|
static enum print_line_t trace_wake_print(struct trace_iterator *iter,
|
int flags, struct trace_event *event)
|
{
|
return trace_ctxwake_print(iter, " +");
|
}
|
|
static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
|
{
|
struct ctx_switch_entry *field;
|
int T;
|
|
trace_assign_type(field, iter->ent);
|
|
if (!S)
|
S = task_index_to_char(field->prev_state);
|
T = task_index_to_char(field->next_state);
|
trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
|
field->prev_pid,
|
field->prev_prio,
|
S,
|
field->next_cpu,
|
field->next_pid,
|
field->next_prio,
|
T);
|
|
return trace_handle_return(&iter->seq);
|
}
|
|
static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
|
struct trace_event *event)
|
{
|
return trace_ctxwake_raw(iter, 0);
|
}
|
|
static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
|
struct trace_event *event)
|
{
|
return trace_ctxwake_raw(iter, '+');
|
}
|
|
|
static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
|
{
|
struct ctx_switch_entry *field;
|
struct trace_seq *s = &iter->seq;
|
int T;
|
|
trace_assign_type(field, iter->ent);
|
|
if (!S)
|
S = task_index_to_char(field->prev_state);
|
T = task_index_to_char(field->next_state);
|
|
SEQ_PUT_HEX_FIELD(s, field->prev_pid);
|
SEQ_PUT_HEX_FIELD(s, field->prev_prio);
|
SEQ_PUT_HEX_FIELD(s, S);
|
SEQ_PUT_HEX_FIELD(s, field->next_cpu);
|
SEQ_PUT_HEX_FIELD(s, field->next_pid);
|
SEQ_PUT_HEX_FIELD(s, field->next_prio);
|
SEQ_PUT_HEX_FIELD(s, T);
|
|
return trace_handle_return(s);
|
}
|
|
static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
|
struct trace_event *event)
|
{
|
return trace_ctxwake_hex(iter, 0);
|
}
|
|
static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
|
struct trace_event *event)
|
{
|
return trace_ctxwake_hex(iter, '+');
|
}
|
|
static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
|
int flags, struct trace_event *event)
|
{
|
struct ctx_switch_entry *field;
|
struct trace_seq *s = &iter->seq;
|
|
trace_assign_type(field, iter->ent);
|
|
SEQ_PUT_FIELD(s, field->prev_pid);
|
SEQ_PUT_FIELD(s, field->prev_prio);
|
SEQ_PUT_FIELD(s, field->prev_state);
|
SEQ_PUT_FIELD(s, field->next_cpu);
|
SEQ_PUT_FIELD(s, field->next_pid);
|
SEQ_PUT_FIELD(s, field->next_prio);
|
SEQ_PUT_FIELD(s, field->next_state);
|
|
return trace_handle_return(s);
|
}
|
|
static struct trace_event_functions trace_ctx_funcs = {
|
.trace = trace_ctx_print,
|
.raw = trace_ctx_raw,
|
.hex = trace_ctx_hex,
|
.binary = trace_ctxwake_bin,
|
};
|
|
static struct trace_event trace_ctx_event = {
|
.type = TRACE_CTX,
|
.funcs = &trace_ctx_funcs,
|
};
|
|
static struct trace_event_functions trace_wake_funcs = {
|
.trace = trace_wake_print,
|
.raw = trace_wake_raw,
|
.hex = trace_wake_hex,
|
.binary = trace_ctxwake_bin,
|
};
|
|
static struct trace_event trace_wake_event = {
|
.type = TRACE_WAKE,
|
.funcs = &trace_wake_funcs,
|
};
|
|
/* TRACE_STACK */
|
|
static enum print_line_t trace_stack_print(struct trace_iterator *iter,
|
int flags, struct trace_event *event)
|
{
|
struct stack_entry *field;
|
struct trace_seq *s = &iter->seq;
|
unsigned long *p;
|
unsigned long *end;
|
|
trace_assign_type(field, iter->ent);
|
end = (unsigned long *)((long)iter->ent + iter->ent_size);
|
|
trace_seq_puts(s, "<stack trace>\n");
|
|
for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) {
|
|
if (trace_seq_has_overflowed(s))
|
break;
|
|
trace_seq_puts(s, " => ");
|
seq_print_ip_sym(s, *p, flags);
|
trace_seq_putc(s, '\n');
|
}
|
|
return trace_handle_return(s);
|
}
|
|
static struct trace_event_functions trace_stack_funcs = {
|
.trace = trace_stack_print,
|
};
|
|
static struct trace_event trace_stack_event = {
|
.type = TRACE_STACK,
|
.funcs = &trace_stack_funcs,
|
};
|
|
/* TRACE_USER_STACK */
|
static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
|
int flags, struct trace_event *event)
|
{
|
struct trace_array *tr = iter->tr;
|
struct userstack_entry *field;
|
struct trace_seq *s = &iter->seq;
|
struct mm_struct *mm = NULL;
|
unsigned int i;
|
|
trace_assign_type(field, iter->ent);
|
|
trace_seq_puts(s, "<user stack trace>\n");
|
|
if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
|
struct task_struct *task;
|
/*
|
* we do the lookup on the thread group leader,
|
* since individual threads might have already quit!
|
*/
|
rcu_read_lock();
|
task = find_task_by_vpid(field->tgid);
|
if (task)
|
mm = get_task_mm(task);
|
rcu_read_unlock();
|
}
|
|
for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
|
unsigned long ip = field->caller[i];
|
|
if (!ip || trace_seq_has_overflowed(s))
|
break;
|
|
trace_seq_puts(s, " => ");
|
seq_print_user_ip(s, mm, ip, flags);
|
trace_seq_putc(s, '\n');
|
}
|
|
if (mm)
|
mmput(mm);
|
|
return trace_handle_return(s);
|
}
|
|
static struct trace_event_functions trace_user_stack_funcs = {
|
.trace = trace_user_stack_print,
|
};
|
|
static struct trace_event trace_user_stack_event = {
|
.type = TRACE_USER_STACK,
|
.funcs = &trace_user_stack_funcs,
|
};
|
|
/* TRACE_HWLAT */
|
static enum print_line_t
|
trace_hwlat_print(struct trace_iterator *iter, int flags,
|
struct trace_event *event)
|
{
|
struct trace_entry *entry = iter->ent;
|
struct trace_seq *s = &iter->seq;
|
struct hwlat_entry *field;
|
|
trace_assign_type(field, entry);
|
|
trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d",
|
field->seqnum,
|
field->duration,
|
field->outer_duration,
|
(long long)field->timestamp.tv_sec,
|
field->timestamp.tv_nsec, field->count);
|
|
if (field->nmi_count) {
|
/*
|
* The generic sched_clock() is not NMI safe, thus
|
* we only record the count and not the time.
|
*/
|
if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
|
trace_seq_printf(s, " nmi-total:%llu",
|
field->nmi_total_ts);
|
trace_seq_printf(s, " nmi-count:%u",
|
field->nmi_count);
|
}
|
|
trace_seq_putc(s, '\n');
|
|
return trace_handle_return(s);
|
}
|
|
|
static enum print_line_t
|
trace_hwlat_raw(struct trace_iterator *iter, int flags,
|
struct trace_event *event)
|
{
|
struct hwlat_entry *field;
|
struct trace_seq *s = &iter->seq;
|
|
trace_assign_type(field, iter->ent);
|
|
trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
|
field->duration,
|
field->outer_duration,
|
(long long)field->timestamp.tv_sec,
|
field->timestamp.tv_nsec,
|
field->seqnum);
|
|
return trace_handle_return(s);
|
}
|
|
static struct trace_event_functions trace_hwlat_funcs = {
|
.trace = trace_hwlat_print,
|
.raw = trace_hwlat_raw,
|
};
|
|
static struct trace_event trace_hwlat_event = {
|
.type = TRACE_HWLAT,
|
.funcs = &trace_hwlat_funcs,
|
};
|
|
/* TRACE_BPUTS */
|
static enum print_line_t
|
trace_bputs_print(struct trace_iterator *iter, int flags,
|
struct trace_event *event)
|
{
|
struct trace_entry *entry = iter->ent;
|
struct trace_seq *s = &iter->seq;
|
struct bputs_entry *field;
|
|
trace_assign_type(field, entry);
|
|
seq_print_ip_sym(s, field->ip, flags);
|
trace_seq_puts(s, ": ");
|
trace_seq_puts(s, field->str);
|
|
return trace_handle_return(s);
|
}
|
|
|
static enum print_line_t
|
trace_bputs_raw(struct trace_iterator *iter, int flags,
|
struct trace_event *event)
|
{
|
struct bputs_entry *field;
|
struct trace_seq *s = &iter->seq;
|
|
trace_assign_type(field, iter->ent);
|
|
trace_seq_printf(s, ": %lx : ", field->ip);
|
trace_seq_puts(s, field->str);
|
|
return trace_handle_return(s);
|
}
|
|
static struct trace_event_functions trace_bputs_funcs = {
|
.trace = trace_bputs_print,
|
.raw = trace_bputs_raw,
|
};
|
|
static struct trace_event trace_bputs_event = {
|
.type = TRACE_BPUTS,
|
.funcs = &trace_bputs_funcs,
|
};
|
|
/* TRACE_BPRINT */
|
static enum print_line_t
|
trace_bprint_print(struct trace_iterator *iter, int flags,
|
struct trace_event *event)
|
{
|
struct trace_entry *entry = iter->ent;
|
struct trace_seq *s = &iter->seq;
|
struct bprint_entry *field;
|
|
trace_assign_type(field, entry);
|
|
seq_print_ip_sym(s, field->ip, flags);
|
trace_seq_puts(s, ": ");
|
trace_seq_bprintf(s, field->fmt, field->buf);
|
|
return trace_handle_return(s);
|
}
|
|
|
static enum print_line_t
|
trace_bprint_raw(struct trace_iterator *iter, int flags,
|
struct trace_event *event)
|
{
|
struct bprint_entry *field;
|
struct trace_seq *s = &iter->seq;
|
|
trace_assign_type(field, iter->ent);
|
|
trace_seq_printf(s, ": %lx : ", field->ip);
|
trace_seq_bprintf(s, field->fmt, field->buf);
|
|
return trace_handle_return(s);
|
}
|
|
static struct trace_event_functions trace_bprint_funcs = {
|
.trace = trace_bprint_print,
|
.raw = trace_bprint_raw,
|
};
|
|
static struct trace_event trace_bprint_event = {
|
.type = TRACE_BPRINT,
|
.funcs = &trace_bprint_funcs,
|
};
|
|
/* TRACE_PRINT */
|
static enum print_line_t trace_print_print(struct trace_iterator *iter,
|
int flags, struct trace_event *event)
|
{
|
struct print_entry *field;
|
struct trace_seq *s = &iter->seq;
|
|
trace_assign_type(field, iter->ent);
|
|
seq_print_ip_sym(s, field->ip, flags);
|
trace_seq_printf(s, ": %s", field->buf);
|
|
return trace_handle_return(s);
|
}
|
|
static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
|
struct trace_event *event)
|
{
|
struct print_entry *field;
|
|
trace_assign_type(field, iter->ent);
|
|
trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
|
|
return trace_handle_return(&iter->seq);
|
}
|
|
static struct trace_event_functions trace_print_funcs = {
|
.trace = trace_print_print,
|
.raw = trace_print_raw,
|
};
|
|
static struct trace_event trace_print_event = {
|
.type = TRACE_PRINT,
|
.funcs = &trace_print_funcs,
|
};
|
|
static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
|
struct trace_event *event)
|
{
|
struct raw_data_entry *field;
|
int i;
|
|
trace_assign_type(field, iter->ent);
|
|
trace_seq_printf(&iter->seq, "# %x buf:", field->id);
|
|
for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
|
trace_seq_printf(&iter->seq, " %02x",
|
(unsigned char)field->buf[i]);
|
|
trace_seq_putc(&iter->seq, '\n');
|
|
return trace_handle_return(&iter->seq);
|
}
|
|
static struct trace_event_functions trace_raw_data_funcs = {
|
.trace = trace_raw_data,
|
.raw = trace_raw_data,
|
};
|
|
static struct trace_event trace_raw_data_event = {
|
.type = TRACE_RAW_DATA,
|
.funcs = &trace_raw_data_funcs,
|
};
|
|
|
static struct trace_event *events[] __initdata = {
|
&trace_fn_event,
|
&trace_ctx_event,
|
&trace_wake_event,
|
&trace_stack_event,
|
&trace_user_stack_event,
|
&trace_bputs_event,
|
&trace_bprint_event,
|
&trace_print_event,
|
&trace_hwlat_event,
|
&trace_raw_data_event,
|
NULL
|
};
|
|
__init static int init_events(void)
|
{
|
struct trace_event *event;
|
int i, ret;
|
|
for (i = 0; events[i]; i++) {
|
event = events[i];
|
|
ret = register_trace_event(event);
|
if (!ret) {
|
printk(KERN_WARNING "event %d failed to register\n",
|
event->type);
|
WARN_ON_ONCE(1);
|
}
|
}
|
|
return 0;
|
}
|
early_initcall(init_events);
|
