1 files changed, 7 insertions, 361 deletions

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 52c89428b0db..c53533b833cf 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -19,7 +19,6 @@
 #include <linux/sched/task.h>
 #include <linux/kallsyms.h>
 #include <linux/seq_file.h>
-#include <linux/suspend.h>
 #include <linux/tracefs.h>
 #include <linux/hardirq.h>
 #include <linux/kthread.h>
@@ -167,12 +166,6 @@ static void ftrace_sync_ipi(void *data)
 	smp_rmb();
 }
 
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-/* Both enabled by default (can be cleared by function_graph tracer flags */
-static bool fgraph_sleep_time = true;
-static bool fgraph_graph_time = true;
-#endif
-
 static ftrace_func_t ftrace_ops_get_list_func(struct ftrace_ops *ops)
 {
 	/*
@@ -790,6 +783,13 @@ function_profile_call(unsigned long ip, unsigned long parent_ip,
 }
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
+static bool fgraph_graph_time = true;
+
+void ftrace_graph_graph_time_control(bool enable)
+{
+	fgraph_graph_time = enable;
+}
+
 static int profile_graph_entry(struct ftrace_graph_ent *trace)
 {
 	int index = current->curr_ret_stack;
@@ -996,10 +996,6 @@ static __init void ftrace_profile_tracefs(struct dentry *d_tracer)
 }
 #endif /* CONFIG_FUNCTION_PROFILER */
 
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-int ftrace_graph_active;
-#endif
-
 #ifdef CONFIG_DYNAMIC_FTRACE
 
 static struct ftrace_ops *removed_ops;
@@ -6697,353 +6693,3 @@ ftrace_enable_sysctl(struct ctl_table *table, int write,
 	mutex_unlock(&ftrace_lock);
 	return ret;
 }
-
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-
-static struct ftrace_ops graph_ops = {
-	.func			= ftrace_stub,
-	.flags			= FTRACE_OPS_FL_RECURSION_SAFE |
-				   FTRACE_OPS_FL_INITIALIZED |
-				   FTRACE_OPS_FL_PID |
-				   FTRACE_OPS_FL_STUB,
-#ifdef FTRACE_GRAPH_TRAMP_ADDR
-	.trampoline		= FTRACE_GRAPH_TRAMP_ADDR,
-	/* trampoline_size is only needed for dynamically allocated tramps */
-#endif
-	ASSIGN_OPS_HASH(graph_ops, &global_ops.local_hash)
-};
-
-void ftrace_graph_sleep_time_control(bool enable)
-{
-	fgraph_sleep_time = enable;
-}
-
-void ftrace_graph_graph_time_control(bool enable)
-{
-	fgraph_graph_time = enable;
-}
-
-int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace)
-{
-	return 0;
-}
-
-/* The callbacks that hook a function */
-trace_func_graph_ret_t ftrace_graph_return =
-			(trace_func_graph_ret_t)ftrace_stub;
-trace_func_graph_ent_t ftrace_graph_entry = ftrace_graph_entry_stub;
-static trace_func_graph_ent_t __ftrace_graph_entry = ftrace_graph_entry_stub;
-
-/* Try to assign a return stack array on FTRACE_RETSTACK_ALLOC_SIZE tasks. */
-static int alloc_retstack_tasklist(struct ftrace_ret_stack **ret_stack_list)
-{
-	int i;
-	int ret = 0;
-	int start = 0, end = FTRACE_RETSTACK_ALLOC_SIZE;
-	struct task_struct *g, *t;
-
-	for (i = 0; i < FTRACE_RETSTACK_ALLOC_SIZE; i++) {
-		ret_stack_list[i] =
-			kmalloc_array(FTRACE_RETFUNC_DEPTH,
-				      sizeof(struct ftrace_ret_stack),
-				      GFP_KERNEL);
-		if (!ret_stack_list[i]) {
-			start = 0;
-			end = i;
-			ret = -ENOMEM;
-			goto free;
-		}
-	}
-
-	read_lock(&tasklist_lock);
-	do_each_thread(g, t) {
-		if (start == end) {
-			ret = -EAGAIN;
-			goto unlock;
-		}
-
-		if (t->ret_stack == NULL) {
-			atomic_set(&t->tracing_graph_pause, 0);
-			atomic_set(&t->trace_overrun, 0);
-			t->curr_ret_stack = -1;
-			t->curr_ret_depth = -1;
-			/* Make sure the tasks see the -1 first: */
-			smp_wmb();
-			t->ret_stack = ret_stack_list[start++];
-		}
-	} while_each_thread(g, t);
-
-unlock:
-	read_unlock(&tasklist_lock);
-free:
-	for (i = start; i < end; i++)
-		kfree(ret_stack_list[i]);
-	return ret;
-}
-
-static void
-ftrace_graph_probe_sched_switch(void *ignore, bool preempt,
-			struct task_struct *prev, struct task_struct *next)
-{
-	unsigned long long timestamp;
-	int index;
-
-	/*
-	 * Does the user want to count the time a function was asleep.
-	 * If so, do not update the time stamps.
-	 */
-	if (fgraph_sleep_time)
-		return;
-
-	timestamp = trace_clock_local();
-
-	prev->ftrace_timestamp = timestamp;
-
-	/* only process tasks that we timestamped */
-	if (!next->ftrace_timestamp)
-		return;
-
-	/*
-	 * Update all the counters in next to make up for the
-	 * time next was sleeping.
-	 */
-	timestamp -= next->ftrace_timestamp;
-
-	for (index = next->curr_ret_stack; index >= 0; index--)
-		next->ret_stack[index].calltime += timestamp;
-}
-
-/* Allocate a return stack for each task */
-static int start_graph_tracing(void)
-{
-	struct ftrace_ret_stack **ret_stack_list;
-	int ret, cpu;
-
-	ret_stack_list = kmalloc_array(FTRACE_RETSTACK_ALLOC_SIZE,
-				       sizeof(struct ftrace_ret_stack *),
-				       GFP_KERNEL);
-
-	if (!ret_stack_list)
-		return -ENOMEM;
-
-	/* The cpu_boot init_task->ret_stack will never be freed */
-	for_each_online_cpu(cpu) {
-		if (!idle_task(cpu)->ret_stack)
-			ftrace_graph_init_idle_task(idle_task(cpu), cpu);
-	}
-
-	do {
-		ret = alloc_retstack_tasklist(ret_stack_list);
-	} while (ret == -EAGAIN);
-
-	if (!ret) {
-		ret = register_trace_sched_switch(ftrace_graph_probe_sched_switch, NULL);
-		if (ret)
-			pr_info("ftrace_graph: Couldn't activate tracepoint"
-				" probe to kernel_sched_switch\n");
-	}
-
-	kfree(ret_stack_list);
-	return ret;
-}
-
-/*
- * Hibernation protection.
- * The state of the current task is too much unstable during
- * suspend/restore to disk. We want to protect against that.
- */
-static int
-ftrace_suspend_notifier_call(struct notifier_block *bl, unsigned long state,
-							void *unused)
-{
-	switch (state) {
-	case PM_HIBERNATION_PREPARE:
-		pause_graph_tracing();
-		break;
-
-	case PM_POST_HIBERNATION:
-		unpause_graph_tracing();
-		break;
-	}
-	return NOTIFY_DONE;
-}
-
-static int ftrace_graph_entry_test(struct ftrace_graph_ent *trace)
-{
-	if (!ftrace_ops_test(&global_ops, trace->func, NULL))
-		return 0;
-	return __ftrace_graph_entry(trace);
-}
-
-/*
- * The function graph tracer should only trace the functions defined
- * by set_ftrace_filter and set_ftrace_notrace. If another function
- * tracer ops is registered, the graph tracer requires testing the
- * function against the global ops, and not just trace any function
- * that any ftrace_ops registered.
- */
-void update_function_graph_func(void)
-{
-	struct ftrace_ops *op;
-	bool do_test = false;
-
-	/*
-	 * The graph and global ops share the same set of functions
-	 * to test. If any other ops is on the list, then
-	 * the graph tracing needs to test if its the function
-	 * it should call.
-	 */
-	do_for_each_ftrace_op(op, ftrace_ops_list) {
-		if (op != &global_ops && op != &graph_ops &&
-		    op != &ftrace_list_end) {
-			do_test = true;
-			/* in double loop, break out with goto */
-			goto out;
-		}
-	} while_for_each_ftrace_op(op);
- out:
-	if (do_test)
-		ftrace_graph_entry = ftrace_graph_entry_test;
-	else
-		ftrace_graph_entry = __ftrace_graph_entry;
-}
-
-static struct notifier_block ftrace_suspend_notifier = {
-	.notifier_call = ftrace_suspend_notifier_call,
-};
-
-int register_ftrace_graph(trace_func_graph_ret_t retfunc,
-			trace_func_graph_ent_t entryfunc)
-{
-	int ret = 0;
-
-	mutex_lock(&ftrace_lock);
-
-	/* we currently allow only one tracer registered at a time */
-	if (ftrace_graph_active) {
-		ret = -EBUSY;
-		goto out;
-	}
-
-	register_pm_notifier(&ftrace_suspend_notifier);
-
-	ftrace_graph_active++;
-	ret = start_graph_tracing();
-	if (ret) {
-		ftrace_graph_active--;
-		goto out;
-	}
-
-	ftrace_graph_return = retfunc;
-
-	/*
-	 * Update the indirect function to the entryfunc, and the
-	 * function that gets called to the entry_test first. Then
-	 * call the update fgraph entry function to determine if
-	 * the entryfunc should be called directly or not.
-	 */
-	__ftrace_graph_entry = entryfunc;
-	ftrace_graph_entry = ftrace_graph_entry_test;
-	update_function_graph_func();
-
-	ret = ftrace_startup(&graph_ops, FTRACE_START_FUNC_RET);
-out:
-	mutex_unlock(&ftrace_lock);
-	return ret;
-}
-
-void unregister_ftrace_graph(void)
-{
-	mutex_lock(&ftrace_lock);
-
-	if (unlikely(!ftrace_graph_active))
-		goto out;
-
-	ftrace_graph_active--;
-	ftrace_graph_return = (trace_func_graph_ret_t)ftrace_stub;
-	ftrace_graph_entry = ftrace_graph_entry_stub;
-	__ftrace_graph_entry = ftrace_graph_entry_stub;
-	ftrace_shutdown(&graph_ops, FTRACE_STOP_FUNC_RET);
-	unregister_pm_notifier(&ftrace_suspend_notifier);
-	unregister_trace_sched_switch(ftrace_graph_probe_sched_switch, NULL);
-
- out:
-	mutex_unlock(&ftrace_lock);
-}
-
-static DEFINE_PER_CPU(struct ftrace_ret_stack *, idle_ret_stack);
-
-static void
-graph_init_task(struct task_struct *t, struct ftrace_ret_stack *ret_stack)
-{
-	atomic_set(&t->tracing_graph_pause, 0);
-	atomic_set(&t->trace_overrun, 0);
-	t->ftrace_timestamp = 0;
-	/* make curr_ret_stack visible before we add the ret_stack */
-	smp_wmb();
-	t->ret_stack = ret_stack;
-}
-
-/*
- * Allocate a return stack for the idle task. May be the first
- * time through, or it may be done by CPU hotplug online.
- */
-void ftrace_graph_init_idle_task(struct task_struct *t, int cpu)
-{
-	t->curr_ret_stack = -1;
-	t->curr_ret_depth = -1;
-	/*
-	 * The idle task has no parent, it either has its own
-	 * stack or no stack at all.
-	 */
-	if (t->ret_stack)
-		WARN_ON(t->ret_stack != per_cpu(idle_ret_stack, cpu));
-
-	if (ftrace_graph_active) {
-		struct ftrace_ret_stack *ret_stack;
-
-		ret_stack = per_cpu(idle_ret_stack, cpu);
-		if (!ret_stack) {
-			ret_stack =
-				kmalloc_array(FTRACE_RETFUNC_DEPTH,
-					      sizeof(struct ftrace_ret_stack),
-					      GFP_KERNEL);
-			if (!ret_stack)
-				return;
-			per_cpu(idle_ret_stack, cpu) = ret_stack;
-		}
-		graph_init_task(t, ret_stack);
-	}
-}
-
-/* Allocate a return stack for newly created task */
-void ftrace_graph_init_task(struct task_struct *t)
-{
-	/* Make sure we do not use the parent ret_stack */
-	t->ret_stack = NULL;
-	t->curr_ret_stack = -1;
-	t->curr_ret_depth = -1;
-
-	if (ftrace_graph_active) {
-		struct ftrace_ret_stack *ret_stack;
-
-		ret_stack = kmalloc_array(FTRACE_RETFUNC_DEPTH,
-					  sizeof(struct ftrace_ret_stack),
-					  GFP_KERNEL);
-		if (!ret_stack)
-			return;
-		graph_init_task(t, ret_stack);
-	}
-}
-
-void ftrace_graph_exit_task(struct task_struct *t)
-{
-	struct ftrace_ret_stack	*ret_stack = t->ret_stack;
-
-	t->ret_stack = NULL;
-	/* NULL must become visible to IRQs before we free it: */
-	barrier();
-
-	kfree(ret_stack);
-}
-#endif