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ftrace: Pass probe ops to probe function 

In preparation to cleaning up the probe function registration code, the
"data" parameter will eventually be removed from the probe->func() call.
Instead it will receive its own "ops" function, in which it can set up its
own data that it needs to map.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2017-04-03 18:18:47 -04:00
parent e51a989679
commit bca6c8d048
5 changed files with 27 additions and 14 deletions
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2
kernel/trace/ftrace.c
View File

@ -3739,7 +3739,7 @@ static void function_trace_probe_call(unsigned long ip, unsigned long parent_ip,
preempt_disable_notrace();
hlist_for_each_entry_rcu_notrace(entry, hhd, node) {
if (entry->ip == ip)
entry->ops->func(ip, parent_ip, &entry->data);
entry->ops->func(ip, parent_ip, entry->ops, &entry->data);
}
preempt_enable_notrace();
}

6
kernel/trace/trace.c
View File

@ -6735,13 +6735,15 @@ static const struct file_operations tracing_dyn_info_fops = {
#if defined(CONFIG_TRACER_SNAPSHOT) && defined(CONFIG_DYNAMIC_FTRACE)
static void
ftrace_snapshot(unsigned long ip, unsigned long parent_ip, void **data)
ftrace_snapshot(unsigned long ip, unsigned long parent_ip,
struct ftrace_probe_ops *ops, void **data)
{
tracing_snapshot();
}
static void
ftrace_count_snapshot(unsigned long ip, unsigned long parent_ip, void **data)
ftrace_count_snapshot(unsigned long ip, unsigned long parent_ip,
struct ftrace_probe_ops *ops, void **data)
{
unsigned long *count = (long *)data;

1
kernel/trace/trace.h
View File

@ -934,6 +934,7 @@ static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) {
struct ftrace_probe_ops {
void (*func)(unsigned long ip,
unsigned long parent_ip,
struct ftrace_probe_ops *ops,
void **data);
int (*init)(struct ftrace_probe_ops *ops,
unsigned long ip, void **data);

8
kernel/trace/trace_events.c
View File

@ -2461,7 +2461,8 @@ struct event_probe_data {
};
static void
event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data)
event_enable_probe(unsigned long ip, unsigned long parent_ip,
struct ftrace_probe_ops *ops, void **_data)
{
struct event_probe_data **pdata = (struct event_probe_data **)_data;
struct event_probe_data *data = *pdata;
@ -2476,7 +2477,8 @@ event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data)
}
static void
event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data)
event_enable_count_probe(unsigned long ip, unsigned long parent_ip,
struct ftrace_probe_ops *ops, void **_data)
{
struct event_probe_data **pdata = (struct event_probe_data **)_data;
struct event_probe_data *data = *pdata;
@ -2494,7 +2496,7 @@ event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data
if (data->count != -1)
(data->count)--;
event_enable_probe(ip, parent_ip, _data);
event_enable_probe(ip, parent_ip, ops, _data);
}
static int

24
kernel/trace/trace_functions.c
View File

@ -326,19 +326,22 @@ static void update_traceon_count(void **data, bool on)
}
static void
ftrace_traceon_count(unsigned long ip, unsigned long parent_ip, void **data)
ftrace_traceon_count(unsigned long ip, unsigned long parent_ip,
struct ftrace_probe_ops *ops, void **data)
{
update_traceon_count(data, 1);
}
static void
ftrace_traceoff_count(unsigned long ip, unsigned long parent_ip, void **data)
ftrace_traceoff_count(unsigned long ip, unsigned long parent_ip,
struct ftrace_probe_ops *ops, void **data)
{
update_traceon_count(data, 0);
}
static void
ftrace_traceon(unsigned long ip, unsigned long parent_ip, void **data)
ftrace_traceon(unsigned long ip, unsigned long parent_ip,
struct ftrace_probe_ops *ops, void **data)
{
if (tracing_is_on())
return;
@ -347,7 +350,8 @@ ftrace_traceon(unsigned long ip, unsigned long parent_ip, void **data)
}
static void
ftrace_traceoff(unsigned long ip, unsigned long parent_ip, void **data)
ftrace_traceoff(unsigned long ip, unsigned long parent_ip,
struct ftrace_probe_ops *ops, void **data)
{
if (!tracing_is_on())
return;
@ -365,13 +369,15 @@ ftrace_traceoff(unsigned long ip, unsigned long parent_ip, void **data)
#define STACK_SKIP 4
static void
ftrace_stacktrace(unsigned long ip, unsigned long parent_ip, void **data)
ftrace_stacktrace(unsigned long ip, unsigned long parent_ip,
struct ftrace_probe_ops *ops, void **data)
{
trace_dump_stack(STACK_SKIP);
}
static void
ftrace_stacktrace_count(unsigned long ip, unsigned long parent_ip, void **data)
ftrace_stacktrace_count(unsigned long ip, unsigned long parent_ip,
struct ftrace_probe_ops *ops, void **data)
{
long *count = (long *)data;
long old_count;
@ -419,7 +425,8 @@ static int update_count(void **data)
}
static void
ftrace_dump_probe(unsigned long ip, unsigned long parent_ip, void **data)
ftrace_dump_probe(unsigned long ip, unsigned long parent_ip,
struct ftrace_probe_ops *ops, void **data)
{
if (update_count(data))
ftrace_dump(DUMP_ALL);
@ -427,7 +434,8 @@ ftrace_dump_probe(unsigned long ip, unsigned long parent_ip, void **data)
/* Only dump the current CPU buffer. */
static void
ftrace_cpudump_probe(unsigned long ip, unsigned long parent_ip, void **data)
ftrace_cpudump_probe(unsigned long ip, unsigned long parent_ip,
struct ftrace_probe_ops *ops, void **data)
{
if (update_count(data))
ftrace_dump(DUMP_ORIG);