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![Christoph Hellwig](/assets/img/avatar_default.png)
Now that the last users of markers have migrated to the event tracer we can kill off the (now orphan) support code. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20090917173527.GA1699@lst.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
251 lines
4.9 KiB
C
251 lines
4.9 KiB
C
/*
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* trace binary printk
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*
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* Copyright (C) 2008 Lai Jiangshan <laijs@cn.fujitsu.com>
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*
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*/
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#include <linux/seq_file.h>
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#include <linux/debugfs.h>
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#include <linux/uaccess.h>
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#include <linux/kernel.h>
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#include <linux/ftrace.h>
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#include <linux/string.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/ctype.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include "trace.h"
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#ifdef CONFIG_MODULES
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/*
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* modules trace_printk()'s formats are autosaved in struct trace_bprintk_fmt
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* which are queued on trace_bprintk_fmt_list.
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*/
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static LIST_HEAD(trace_bprintk_fmt_list);
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/* serialize accesses to trace_bprintk_fmt_list */
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static DEFINE_MUTEX(btrace_mutex);
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struct trace_bprintk_fmt {
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struct list_head list;
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char fmt[0];
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};
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static inline struct trace_bprintk_fmt *lookup_format(const char *fmt)
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{
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struct trace_bprintk_fmt *pos;
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list_for_each_entry(pos, &trace_bprintk_fmt_list, list) {
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if (!strcmp(pos->fmt, fmt))
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return pos;
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}
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return NULL;
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}
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static
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void hold_module_trace_bprintk_format(const char **start, const char **end)
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{
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const char **iter;
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mutex_lock(&btrace_mutex);
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for (iter = start; iter < end; iter++) {
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struct trace_bprintk_fmt *tb_fmt = lookup_format(*iter);
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if (tb_fmt) {
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*iter = tb_fmt->fmt;
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continue;
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}
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tb_fmt = kmalloc(offsetof(struct trace_bprintk_fmt, fmt)
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+ strlen(*iter) + 1, GFP_KERNEL);
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if (tb_fmt) {
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list_add_tail(&tb_fmt->list, &trace_bprintk_fmt_list);
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strcpy(tb_fmt->fmt, *iter);
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*iter = tb_fmt->fmt;
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} else
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*iter = NULL;
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}
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mutex_unlock(&btrace_mutex);
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}
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static int module_trace_bprintk_format_notify(struct notifier_block *self,
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unsigned long val, void *data)
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{
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struct module *mod = data;
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if (mod->num_trace_bprintk_fmt) {
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const char **start = mod->trace_bprintk_fmt_start;
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const char **end = start + mod->num_trace_bprintk_fmt;
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if (val == MODULE_STATE_COMING)
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hold_module_trace_bprintk_format(start, end);
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}
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return 0;
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}
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#else /* !CONFIG_MODULES */
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__init static int
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module_trace_bprintk_format_notify(struct notifier_block *self,
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unsigned long val, void *data)
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{
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return 0;
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}
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#endif /* CONFIG_MODULES */
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__initdata_or_module static
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struct notifier_block module_trace_bprintk_format_nb = {
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.notifier_call = module_trace_bprintk_format_notify,
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};
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int __trace_bprintk(unsigned long ip, const char *fmt, ...)
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{
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int ret;
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va_list ap;
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if (unlikely(!fmt))
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return 0;
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if (!(trace_flags & TRACE_ITER_PRINTK))
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return 0;
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va_start(ap, fmt);
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ret = trace_vbprintk(ip, 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_bprintk);
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int __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap)
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{
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if (unlikely(!fmt))
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return 0;
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if (!(trace_flags & TRACE_ITER_PRINTK))
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return 0;
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return trace_vbprintk(ip, fmt, ap);
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}
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EXPORT_SYMBOL_GPL(__ftrace_vbprintk);
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int __trace_printk(unsigned long ip, const char *fmt, ...)
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{
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int ret;
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va_list ap;
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if (!(trace_flags & TRACE_ITER_PRINTK))
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return 0;
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va_start(ap, fmt);
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ret = trace_vprintk(ip, 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_printk);
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int __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap)
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{
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if (!(trace_flags & TRACE_ITER_PRINTK))
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return 0;
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return trace_vprintk(ip, fmt, ap);
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}
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EXPORT_SYMBOL_GPL(__ftrace_vprintk);
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static void *
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t_start(struct seq_file *m, loff_t *pos)
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{
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const char **fmt = __start___trace_bprintk_fmt + *pos;
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if ((unsigned long)fmt >= (unsigned long)__stop___trace_bprintk_fmt)
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return NULL;
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return fmt;
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}
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static void *t_next(struct seq_file *m, void * v, loff_t *pos)
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{
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(*pos)++;
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return t_start(m, pos);
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}
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static int t_show(struct seq_file *m, void *v)
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{
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const char **fmt = v;
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const char *str = *fmt;
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int i;
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seq_printf(m, "0x%lx : \"", *(unsigned long *)fmt);
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/*
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* Tabs and new lines need to be converted.
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*/
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for (i = 0; str[i]; i++) {
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switch (str[i]) {
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case '\n':
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seq_puts(m, "\\n");
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break;
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case '\t':
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seq_puts(m, "\\t");
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break;
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case '\\':
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seq_puts(m, "\\");
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break;
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case '"':
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seq_puts(m, "\\\"");
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break;
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default:
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seq_putc(m, str[i]);
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}
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}
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seq_puts(m, "\"\n");
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return 0;
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}
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static void t_stop(struct seq_file *m, void *p)
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{
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}
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static const struct seq_operations show_format_seq_ops = {
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.start = t_start,
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.next = t_next,
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.show = t_show,
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.stop = t_stop,
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};
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static int
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ftrace_formats_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &show_format_seq_ops);
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}
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static const struct file_operations ftrace_formats_fops = {
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.open = ftrace_formats_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static __init int init_trace_printk_function_export(void)
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{
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struct dentry *d_tracer;
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d_tracer = tracing_init_dentry();
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if (!d_tracer)
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return 0;
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trace_create_file("printk_formats", 0444, d_tracer,
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NULL, &ftrace_formats_fops);
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return 0;
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}
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fs_initcall(init_trace_printk_function_export);
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static __init int init_trace_printk(void)
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{
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return register_module_notifier(&module_trace_bprintk_format_nb);
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}
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early_initcall(init_trace_printk);
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