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ftrace: Allow other users of function tracing to use the output listing 

The function tracer is set up to allow any other subsystem (like perf)
to use it. Ftrace already has a way to list what functions are enabled
by the global_ops. It would be very helpful to let other users of
the function tracer to be able to use the same code.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2011-12-19 14:41:25 -05:00 committed by Steven Rostedt
parent 06a51d9307
commit fc13cb0ce4
2 changed files with 60 additions and 16 deletions
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35
include/linux/ftrace.h
View File

@ -202,6 +202,14 @@ enum {
FTRACE_UPDATE_MAKE_NOP,
};
enum {
FTRACE_ITER_FILTER = (1 << 0),
FTRACE_ITER_NOTRACE = (1 << 1),
FTRACE_ITER_PRINTALL = (1 << 2),
FTRACE_ITER_HASH = (1 << 3),
FTRACE_ITER_ENABLED = (1 << 4),
};
void arch_ftrace_update_code(int command);
struct ftrace_rec_iter;
@ -217,6 +225,15 @@ int ftrace_location(unsigned long ip);
extern ftrace_func_t ftrace_trace_function;
int ftrace_regex_open(struct ftrace_ops *ops, int flag,
struct inode *inode, struct file *file);
ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
size_t cnt, loff_t *ppos);
ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
size_t cnt, loff_t *ppos);
loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int origin);
int ftrace_regex_release(struct inode *inode, struct file *file);
/* defined in arch */
extern int ftrace_ip_converted(unsigned long ip);
extern int ftrace_dyn_arch_init(void *data);
@ -311,6 +328,24 @@ static inline int ftrace_text_reserved(void *start, void *end)
{
return 0;
}
/*
* Again users of functions that have ftrace_ops may not
* have them defined when ftrace is not enabled, but these
* functions may still be called. Use a macro instead of inline.
*/
#define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; })
static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
size_t cnt, loff_t *ppos) { return -ENODEV; }
static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
size_t cnt, loff_t *ppos) { return -ENODEV; }
static inline loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int origin)
{
return -ENODEV;
}
static inline int
ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; }
#endif /* CONFIG_DYNAMIC_FTRACE */
/* totally disable ftrace - can not re-enable after this */

41
kernel/trace/ftrace.c
View File

@ -2134,14 +2134,6 @@ static int __init ftrace_dyn_table_alloc(unsigned long num_to_init)
return 0;
}
enum {
FTRACE_ITER_FILTER = (1 << 0),
FTRACE_ITER_NOTRACE = (1 << 1),
FTRACE_ITER_PRINTALL = (1 << 2),
FTRACE_ITER_HASH = (1 << 3),
FTRACE_ITER_ENABLED = (1 << 4),
};
#define FTRACE_BUFF_MAX (KSYM_SYMBOL_LEN+4) /* room for wildcards */
struct ftrace_iterator {
@ -2249,7 +2241,7 @@ static void *
t_next(struct seq_file *m, void *v, loff_t *pos)
{
struct ftrace_iterator *iter = m->private;
struct ftrace_ops *ops = &global_ops;
struct ftrace_ops *ops = iter->ops;
struct dyn_ftrace *rec = NULL;
if (unlikely(ftrace_disabled))
@ -2305,7 +2297,7 @@ static void reset_iter_read(struct ftrace_iterator *iter)
static void *t_start(struct seq_file *m, loff_t *pos)
{
struct ftrace_iterator *iter = m->private;
struct ftrace_ops *ops = &global_ops;
struct ftrace_ops *ops = iter->ops;
void *p = NULL;
loff_t l;
@ -2414,6 +2406,7 @@ ftrace_avail_open(struct inode *inode, struct file *file)
return -ENOMEM;
iter->pg = ftrace_pages_start;
iter->ops = &global_ops;
ret = seq_open(file, &show_ftrace_seq_ops);
if (!ret) {
@ -2442,6 +2435,7 @@ ftrace_enabled_open(struct inode *inode, struct file *file)
iter->pg = ftrace_pages_start;
iter->flags = FTRACE_ITER_ENABLED;
iter->ops = &global_ops;
ret = seq_open(file, &show_ftrace_seq_ops);
if (!ret) {
@ -2462,7 +2456,23 @@ static void ftrace_filter_reset(struct ftrace_hash *hash)
mutex_unlock(&ftrace_lock);
}
static int
/**
* ftrace_regex_open - initialize function tracer filter files
* @ops: The ftrace_ops that hold the hash filters
* @flag: The type of filter to process
* @inode: The inode, usually passed in to your open routine
* @file: The file, usually passed in to your open routine
*
* ftrace_regex_open() initializes the filter files for the
* @ops. Depending on @flag it may process the filter hash or
* the notrace hash of @ops. With this called from the open
* routine, you can use ftrace_filter_write() for the write
* routine if @flag has FTRACE_ITER_FILTER set, or
* ftrace_notrace_write() if @flag has FTRACE_ITER_NOTRACE set.
* ftrace_regex_lseek() should be used as the lseek routine, and
* release must call ftrace_regex_release().
*/
int
ftrace_regex_open(struct ftrace_ops *ops, int flag,
struct inode *inode, struct file *file)
{
@ -2542,7 +2552,7 @@ ftrace_notrace_open(struct inode *inode, struct file *file)
inode, file);
}
static loff_t
loff_t
ftrace_regex_lseek(struct file *file, loff_t offset, int origin)
{
loff_t ret;
@ -3095,14 +3105,14 @@ ftrace_regex_write(struct file *file, const char __user *ubuf,
return ret;
}
static ssize_t
ssize_t
ftrace_filter_write(struct file *file, const char __user *ubuf,
size_t cnt, loff_t *ppos)
{
return ftrace_regex_write(file, ubuf, cnt, ppos, 1);
}
static ssize_t
ssize_t
ftrace_notrace_write(struct file *file, const char __user *ubuf,
size_t cnt, loff_t *ppos)
{
@ -3292,8 +3302,7 @@ static void __init set_ftrace_early_filters(void)
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
}
static int
ftrace_regex_release(struct inode *inode, struct file *file)
int ftrace_regex_release(struct inode *inode, struct file *file)
{
struct seq_file *m = (struct seq_file *)file->private_data;
struct ftrace_iterator *iter;