1457 lines
30 KiB
C
1457 lines
30 KiB
C
/*
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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 "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 + 1;
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int trace_print_seq(struct seq_file *m, struct trace_seq *s)
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{
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int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
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int ret;
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ret = seq_write(m, s->buffer, len);
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/*
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* Only reset this buffer if we successfully wrote to the
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* seq_file buffer.
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*/
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if (!ret)
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trace_seq_init(s);
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return ret;
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}
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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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int ret;
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trace_assign_type(field, entry);
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ret = trace_seq_puts(s, field->str);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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return TRACE_TYPE_HANDLED;
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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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int ret;
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trace_assign_type(field, entry);
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ret = trace_seq_bprintf(s, field->fmt, field->buf);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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return TRACE_TYPE_HANDLED;
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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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int ret;
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trace_assign_type(field, entry);
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ret = trace_seq_printf(s, "%s", field->buf);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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return TRACE_TYPE_HANDLED;
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}
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/**
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* trace_seq_printf - sequence printing of trace information
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* @s: trace sequence descriptor
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* @fmt: printf format string
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*
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* It returns 0 if the trace oversizes the buffer's free
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* space, 1 otherwise.
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*
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* The tracer may use either sequence operations or its own
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* copy to user routines. To simplify formating of a trace
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* trace_seq_printf is used to store strings into a special
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* buffer (@s). Then the output may be either used by
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* the sequencer or pulled into another buffer.
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*/
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int
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trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
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{
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int len = (PAGE_SIZE - 1) - s->len;
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va_list ap;
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int ret;
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if (s->full || !len)
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return 0;
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va_start(ap, fmt);
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ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
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va_end(ap);
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/* If we can't write it all, don't bother writing anything */
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if (ret >= len) {
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s->full = 1;
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return 0;
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}
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s->len += ret;
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return 1;
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}
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EXPORT_SYMBOL_GPL(trace_seq_printf);
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/**
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* trace_seq_vprintf - sequence printing of trace information
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* @s: trace sequence descriptor
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* @fmt: printf format string
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*
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* The tracer may use either sequence operations or its own
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* copy to user routines. To simplify formating of a trace
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* trace_seq_printf is used to store strings into a special
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* buffer (@s). Then the output may be either used by
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* the sequencer or pulled into another buffer.
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*/
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int
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trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
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{
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int len = (PAGE_SIZE - 1) - s->len;
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int ret;
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if (s->full || !len)
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return 0;
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ret = vsnprintf(s->buffer + s->len, len, fmt, args);
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/* If we can't write it all, don't bother writing anything */
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if (ret >= len) {
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s->full = 1;
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return 0;
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}
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s->len += ret;
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return len;
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}
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EXPORT_SYMBOL_GPL(trace_seq_vprintf);
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int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
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{
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int len = (PAGE_SIZE - 1) - s->len;
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int ret;
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if (s->full || !len)
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return 0;
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ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
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/* If we can't write it all, don't bother writing anything */
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if (ret >= len) {
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s->full = 1;
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return 0;
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}
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s->len += ret;
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return len;
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}
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/**
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* trace_seq_puts - trace sequence printing of simple string
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* @s: trace sequence descriptor
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* @str: simple string to record
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*
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* The tracer may use either the sequence operations or its own
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* copy to user routines. This function records a simple string
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* into a special buffer (@s) for later retrieval by a sequencer
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* or other mechanism.
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*/
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int trace_seq_puts(struct trace_seq *s, const char *str)
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{
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int len = strlen(str);
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if (s->full)
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return 0;
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if (len > ((PAGE_SIZE - 1) - s->len)) {
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s->full = 1;
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return 0;
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}
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memcpy(s->buffer + s->len, str, len);
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s->len += len;
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return len;
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}
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int trace_seq_putc(struct trace_seq *s, unsigned char c)
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{
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if (s->full)
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return 0;
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if (s->len >= (PAGE_SIZE - 1)) {
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s->full = 1;
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return 0;
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}
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s->buffer[s->len++] = c;
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return 1;
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}
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EXPORT_SYMBOL(trace_seq_putc);
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int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
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{
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if (s->full)
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return 0;
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if (len > ((PAGE_SIZE - 1) - s->len)) {
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s->full = 1;
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return 0;
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}
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memcpy(s->buffer + s->len, mem, len);
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s->len += len;
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return len;
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}
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int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
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{
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unsigned char hex[HEX_CHARS];
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const unsigned char *data = mem;
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int i, j;
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if (s->full)
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return 0;
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#ifdef __BIG_ENDIAN
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for (i = 0, j = 0; i < len; i++) {
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#else
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for (i = len-1, j = 0; i >= 0; i--) {
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#endif
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hex[j++] = hex_asc_hi(data[i]);
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hex[j++] = hex_asc_lo(data[i]);
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}
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hex[j++] = ' ';
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return trace_seq_putmem(s, hex, j);
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}
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void *trace_seq_reserve(struct trace_seq *s, size_t len)
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{
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void *ret;
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if (s->full)
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return NULL;
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if (len > ((PAGE_SIZE - 1) - s->len)) {
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s->full = 1;
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return NULL;
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}
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ret = s->buffer + s->len;
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s->len += len;
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return ret;
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}
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int trace_seq_path(struct trace_seq *s, const struct path *path)
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{
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unsigned char *p;
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if (s->full)
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return 0;
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if (s->len >= (PAGE_SIZE - 1)) {
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s->full = 1;
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return 0;
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}
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p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
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if (!IS_ERR(p)) {
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p = mangle_path(s->buffer + s->len, p, "\n");
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if (p) {
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s->len = p - s->buffer;
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return 1;
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}
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} else {
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s->buffer[s->len++] = '?';
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return 1;
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}
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s->full = 1;
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return 0;
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}
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const char *
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ftrace_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 = p->buffer + p->len;
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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(ftrace_print_flags_seq);
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const char *
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ftrace_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 = p->buffer + p->len;
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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 *)(p->buffer + p->len))
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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(ftrace_print_symbols_seq);
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#if BITS_PER_LONG == 32
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const char *
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ftrace_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 = p->buffer + p->len;
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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 *)(p->buffer + p->len))
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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(ftrace_print_symbols_seq_u64);
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#endif
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const char *
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ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
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{
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int i;
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const char *ret = p->buffer + p->len;
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for (i = 0; i < buf_len; i++)
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trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", 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(ftrace_print_hex_seq);
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int ftrace_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 ftrace_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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int ret;
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event = container_of(trace_event, struct ftrace_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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ret = trace_seq_printf(s, "%s: ", event->name);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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return 0;
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}
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EXPORT_SYMBOL(ftrace_raw_output_prep);
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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 int
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seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
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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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kallsyms_lookup(address, NULL, NULL, NULL, str);
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name = kretprobed(str);
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return trace_seq_printf(s, fmt, name);
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#endif
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return 1;
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}
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static int
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seq_print_sym_offset(struct trace_seq *s, const char *fmt,
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unsigned long address)
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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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sprint_symbol(str, address);
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name = kretprobed(str);
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return trace_seq_printf(s, fmt, name);
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#endif
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return 1;
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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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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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down_read(&mm->mmap_sem);
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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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ret = trace_seq_printf(s, "[+0x%lx]",
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ip - vmstart);
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}
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up_read(&mm->mmap_sem);
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}
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if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
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ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
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return ret;
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}
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int
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seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
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unsigned long sym_flags)
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{
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struct mm_struct *mm = NULL;
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int ret = 1;
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unsigned int i;
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if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
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struct task_struct *task;
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/*
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* we do the lookup on the thread group leader,
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* since individual threads might have already quit!
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*/
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rcu_read_lock();
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task = find_task_by_vpid(entry->tgid);
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if (task)
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mm = get_task_mm(task);
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rcu_read_unlock();
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}
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for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
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unsigned long ip = entry->caller[i];
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if (ip == ULONG_MAX || !ret)
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break;
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if (ret)
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ret = trace_seq_puts(s, " => ");
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if (!ip) {
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if (ret)
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ret = trace_seq_puts(s, "??");
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if (ret)
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ret = trace_seq_puts(s, "\n");
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continue;
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}
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if (!ret)
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break;
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if (ret)
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ret = seq_print_user_ip(s, mm, ip, sym_flags);
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ret = trace_seq_puts(s, "\n");
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}
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if (mm)
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mmput(mm);
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return ret;
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}
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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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int ret;
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if (!ip)
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return trace_seq_printf(s, "0");
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|
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if (sym_flags & TRACE_ITER_SYM_OFFSET)
|
|
ret = seq_print_sym_offset(s, "%s", ip);
|
|
else
|
|
ret = seq_print_sym_short(s, "%s", ip);
|
|
|
|
if (!ret)
|
|
return 0;
|
|
|
|
if (sym_flags & TRACE_ITER_SYM_ADDR)
|
|
ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* trace_print_lat_fmt - print the irq, preempt and lockdep fields
|
|
* @s: trace seq struct to write to
|
|
* @entry: The trace entry field from the ring buffer
|
|
*
|
|
* Prints the generic fields of irqs off, in hard or softirq, preempt
|
|
* count.
|
|
*/
|
|
int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
|
|
{
|
|
char hardsoft_irq;
|
|
char need_resched;
|
|
char irqs_off;
|
|
int hardirq;
|
|
int softirq;
|
|
int ret;
|
|
|
|
hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
|
|
softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
|
|
|
|
irqs_off =
|
|
(entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
|
|
(entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
|
|
'.';
|
|
need_resched =
|
|
(entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.';
|
|
hardsoft_irq =
|
|
(hardirq && softirq) ? 'H' :
|
|
hardirq ? 'h' :
|
|
softirq ? 's' :
|
|
'.';
|
|
|
|
if (!trace_seq_printf(s, "%c%c%c",
|
|
irqs_off, need_resched, hardsoft_irq))
|
|
return 0;
|
|
|
|
if (entry->preempt_count)
|
|
ret = trace_seq_printf(s, "%x", entry->preempt_count);
|
|
else
|
|
ret = trace_seq_putc(s, '.');
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
|
|
{
|
|
char comm[TASK_COMM_LEN];
|
|
|
|
trace_find_cmdline(entry->pid, comm);
|
|
|
|
if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
|
|
comm, entry->pid, cpu))
|
|
return 0;
|
|
|
|
return trace_print_lat_fmt(s, entry);
|
|
}
|
|
|
|
static unsigned long preempt_mark_thresh_us = 100;
|
|
|
|
static int
|
|
lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
|
|
{
|
|
unsigned long verbose = 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->trace_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;
|
|
|
|
return 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) {
|
|
return trace_seq_printf(
|
|
s, "[%016llx] %lld (+%lld): ",
|
|
iter->ts, abs_ts, rel_ts);
|
|
} else if (!verbose && in_ns) {
|
|
return trace_seq_printf(
|
|
s, " %4lldus%c: ",
|
|
abs_ts,
|
|
rel_ts > preempt_mark_thresh_us ? '!' :
|
|
rel_ts > 1 ? '+' : ' ');
|
|
} else { /* !verbose && !in_ns */
|
|
return trace_seq_printf(s, " %4lld: ", abs_ts);
|
|
}
|
|
}
|
|
|
|
int trace_print_context(struct trace_iterator *iter)
|
|
{
|
|
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];
|
|
int ret;
|
|
|
|
trace_find_cmdline(entry->pid, comm);
|
|
|
|
ret = trace_seq_printf(s, "%16s-%-5d [%03d] ",
|
|
comm, entry->pid, iter->cpu);
|
|
if (!ret)
|
|
return 0;
|
|
|
|
if (trace_flags & TRACE_ITER_IRQ_INFO) {
|
|
ret = trace_print_lat_fmt(s, entry);
|
|
if (!ret)
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
return trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
|
|
} else
|
|
return trace_seq_printf(s, " %12llu: ", iter->ts);
|
|
}
|
|
|
|
int trace_print_lat_context(struct trace_iterator *iter)
|
|
{
|
|
u64 next_ts;
|
|
int ret;
|
|
/* trace_find_next_entry will reset ent_size */
|
|
int ent_size = iter->ent_size;
|
|
struct trace_seq *s = &iter->seq;
|
|
struct trace_entry *entry = iter->ent,
|
|
*next_entry = trace_find_next_entry(iter, NULL,
|
|
&next_ts);
|
|
unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
|
|
|
|
/* Restore the original ent_size */
|
|
iter->ent_size = ent_size;
|
|
|
|
if (!next_entry)
|
|
next_ts = iter->ts;
|
|
|
|
if (verbose) {
|
|
char comm[TASK_COMM_LEN];
|
|
|
|
trace_find_cmdline(entry->pid, comm);
|
|
|
|
ret = trace_seq_printf(
|
|
s, "%16s %5d %3d %d %08x %08lx ",
|
|
comm, entry->pid, iter->cpu, entry->flags,
|
|
entry->preempt_count, iter->idx);
|
|
} else {
|
|
ret = lat_print_generic(s, entry, iter->cpu);
|
|
}
|
|
|
|
if (ret)
|
|
ret = lat_print_timestamp(iter, next_ts);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
|
|
|
|
static int task_state_char(unsigned long state)
|
|
{
|
|
int bit = state ? __ffs(state) + 1 : 0;
|
|
|
|
return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
|
|
}
|
|
|
|
/**
|
|
* 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 last = __TRACE_LAST_TYPE;
|
|
|
|
if (list_empty(&ftrace_event_list)) {
|
|
*list = &ftrace_event_list;
|
|
return last + 1;
|
|
}
|
|
|
|
/*
|
|
* 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 != last + 1)
|
|
break;
|
|
last++;
|
|
}
|
|
|
|
/* Did we used up all 65 thousand events??? */
|
|
if ((last + 1) > FTRACE_MAX_EVENT)
|
|
return 0;
|
|
|
|
*list = &e->list;
|
|
return last + 1;
|
|
}
|
|
|
|
void trace_event_read_lock(void)
|
|
{
|
|
down_read(&trace_event_sem);
|
|
}
|
|
|
|
void trace_event_read_unlock(void)
|
|
{
|
|
up_read(&trace_event_sem);
|
|
}
|
|
|
|
/**
|
|
* register_ftrace_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_ftrace_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 > FTRACE_MAX_EVENT) {
|
|
|
|
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_ftrace_event);
|
|
|
|
/*
|
|
* Used by module code with the trace_event_sem held for write.
|
|
*/
|
|
int __unregister_ftrace_event(struct trace_event *event)
|
|
{
|
|
hlist_del(&event->node);
|
|
list_del(&event->list);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* unregister_ftrace_event - remove a no longer used event
|
|
* @event: the event to remove
|
|
*/
|
|
int unregister_ftrace_event(struct trace_event *event)
|
|
{
|
|
down_write(&trace_event_sem);
|
|
__unregister_ftrace_event(event);
|
|
up_write(&trace_event_sem);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(unregister_ftrace_event);
|
|
|
|
/*
|
|
* Standard events
|
|
*/
|
|
|
|
enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
|
|
struct trace_event *event)
|
|
{
|
|
if (!trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type))
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
}
|
|
|
|
/* 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);
|
|
|
|
if (!seq_print_ip_sym(s, field->ip, flags))
|
|
goto partial;
|
|
|
|
if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
|
|
if (!trace_seq_printf(s, " <-"))
|
|
goto partial;
|
|
if (!seq_print_ip_sym(s,
|
|
field->parent_ip,
|
|
flags))
|
|
goto partial;
|
|
}
|
|
if (!trace_seq_printf(s, "\n"))
|
|
goto partial;
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
|
|
partial:
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
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);
|
|
|
|
if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
|
|
field->ip,
|
|
field->parent_ip))
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
}
|
|
|
|
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_RET(s, field->ip);
|
|
SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
}
|
|
|
|
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_RET(s, field->ip);
|
|
SEQ_PUT_FIELD_RET(s, field->parent_ip);
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
}
|
|
|
|
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_state_char(field->next_state);
|
|
S = task_state_char(field->prev_state);
|
|
trace_find_cmdline(field->next_pid, comm);
|
|
if (!trace_seq_printf(&iter->seq,
|
|
" %5d:%3d:%c %s [%03d] %5d:%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_TYPE_PARTIAL_LINE;
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
}
|
|
|
|
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_state_char(field->prev_state);
|
|
T = task_state_char(field->next_state);
|
|
if (!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_TYPE_PARTIAL_LINE;
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
}
|
|
|
|
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_state_char(field->prev_state);
|
|
T = task_state_char(field->next_state);
|
|
|
|
SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
|
|
SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
|
|
SEQ_PUT_HEX_FIELD_RET(s, S);
|
|
SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
|
|
SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
|
|
SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
|
|
SEQ_PUT_HEX_FIELD_RET(s, T);
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
}
|
|
|
|
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_RET(s, field->prev_pid);
|
|
SEQ_PUT_FIELD_RET(s, field->prev_prio);
|
|
SEQ_PUT_FIELD_RET(s, field->prev_state);
|
|
SEQ_PUT_FIELD_RET(s, field->next_pid);
|
|
SEQ_PUT_FIELD_RET(s, field->next_prio);
|
|
SEQ_PUT_FIELD_RET(s, field->next_state);
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
}
|
|
|
|
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);
|
|
|
|
if (!trace_seq_puts(s, "<stack trace>\n"))
|
|
goto partial;
|
|
|
|
for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
|
|
if (!trace_seq_puts(s, " => "))
|
|
goto partial;
|
|
|
|
if (!seq_print_ip_sym(s, *p, flags))
|
|
goto partial;
|
|
if (!trace_seq_puts(s, "\n"))
|
|
goto partial;
|
|
}
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
|
|
partial:
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
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 userstack_entry *field;
|
|
struct trace_seq *s = &iter->seq;
|
|
|
|
trace_assign_type(field, iter->ent);
|
|
|
|
if (!trace_seq_puts(s, "<user stack trace>\n"))
|
|
goto partial;
|
|
|
|
if (!seq_print_userip_objs(field, s, flags))
|
|
goto partial;
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
|
|
partial:
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
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_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);
|
|
|
|
if (!seq_print_ip_sym(s, field->ip, flags))
|
|
goto partial;
|
|
|
|
if (!trace_seq_puts(s, ": "))
|
|
goto partial;
|
|
|
|
if (!trace_seq_puts(s, field->str))
|
|
goto partial;
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
|
|
partial:
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
|
|
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);
|
|
|
|
if (!trace_seq_printf(s, ": %lx : ", field->ip))
|
|
goto partial;
|
|
|
|
if (!trace_seq_puts(s, field->str))
|
|
goto partial;
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
|
|
partial:
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
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);
|
|
|
|
if (!seq_print_ip_sym(s, field->ip, flags))
|
|
goto partial;
|
|
|
|
if (!trace_seq_puts(s, ": "))
|
|
goto partial;
|
|
|
|
if (!trace_seq_bprintf(s, field->fmt, field->buf))
|
|
goto partial;
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
|
|
partial:
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
|
|
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);
|
|
|
|
if (!trace_seq_printf(s, ": %lx : ", field->ip))
|
|
goto partial;
|
|
|
|
if (!trace_seq_bprintf(s, field->fmt, field->buf))
|
|
goto partial;
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
|
|
partial:
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
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);
|
|
|
|
if (!seq_print_ip_sym(s, field->ip, flags))
|
|
goto partial;
|
|
|
|
if (!trace_seq_printf(s, ": %s", field->buf))
|
|
goto partial;
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
|
|
partial:
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
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);
|
|
|
|
if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
|
|
goto partial;
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
|
|
partial:
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
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 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,
|
|
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_ftrace_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);
|