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tracing: Pass the trace_array into ftrace_probe_ops functions

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Pass the trace_array associated to a ftrace_probe_ops into the probe_ops
func(), init() and free() functions. The trace_array is the descriptor that
describes a tracing instance. This will help create the infrastructure that
will allow having function probes unique to tracing instances.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware)
2017-04-10 22:30:05 -04:00
parent 04ec7bb642
commit b5f081b563
5 changed files with 51 additions and 30 deletions
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13
kernel/trace/ftrace.c
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@@ -3791,6 +3791,7 @@ static void function_trace_probe_call(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *op, struct pt_regs *pt_regs)
{
struct ftrace_probe_ops *probe_ops;
struct trace_array *tr = op->private;
probe_ops = container_of(op, struct ftrace_probe_ops, ops);
@@ -3800,7 +3801,7 @@ static void function_trace_probe_call(unsigned long ip, unsigned long parent_ip,
* on the hash. rcu_read_lock is too dangerous here.
*/
preempt_disable_notrace();
probe_ops->func(ip, parent_ip, probe_ops, NULL);
probe_ops->func(ip, parent_ip, tr, probe_ops, NULL);
preempt_enable_notrace();
}
@@ -3969,6 +3970,7 @@ register_ftrace_function_probe(char *glob, struct trace_array *tr,
ops->ops.func = function_trace_probe_call;
ftrace_ops_init(&ops->ops);
INIT_LIST_HEAD(&ops->list);
ops->ops.private = tr;
}
mutex_lock(&ops->ops.func_hash->regex_lock);
@@ -3997,7 +3999,7 @@ register_ftrace_function_probe(char *glob, struct trace_array *tr,
* to give the caller an opportunity to do so.
*/
if (ops->init) {
ret = ops->init(ops, entry->ip, data);
ret = ops->init(ops, tr, entry->ip, data);
if (ret < 0)
goto out;
}
@@ -4038,7 +4040,7 @@ register_ftrace_function_probe(char *glob, struct trace_array *tr,
hlist_for_each_entry(entry, &hash->buckets[i], hlist) {
if (ftrace_lookup_ip(old_hash, entry->ip))
continue;
ops->free(ops, entry->ip, NULL);
ops->free(ops, tr, entry->ip, NULL);
}
}
goto out_unlock;
@@ -4055,6 +4057,7 @@ unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops)
struct ftrace_hash *hash = NULL;
struct hlist_node *tmp;
struct hlist_head hhd;
struct trace_array *tr;
char str[KSYM_SYMBOL_LEN];
int i, ret;
int size;
@@ -4062,6 +4065,8 @@ unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops)
if (!(ops->ops.flags & FTRACE_OPS_FL_INITIALIZED))
return -EINVAL;
tr = ops->ops.private;
if (glob && (strcmp(glob, "*") == 0 || !strlen(glob)))
func_g.search = NULL;
else if (glob) {
@@ -4139,7 +4144,7 @@ unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops)
hlist_for_each_entry_safe(entry, tmp, &hhd, hlist) {
hlist_del(&entry->hlist);
if (ops->free)
ops->free(ops, entry->ip, NULL);
ops->free(ops, tr, entry->ip, NULL);
kfree(entry);
}
mutex_unlock(&ftrace_lock);