Commit 8cfcf155 authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by Steven Rostedt (VMware)
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tracing: kprobes: Output kprobe event to printk buffer 

Since kprobe-events use event_trigger_unlock_commit_regs() directly,
that events doesn't show up in printk buffer if "tp_printk" is set.

Use trace_event_buffer_commit() in kprobe events so that it can
invoke output_printk() as same as other trace events.

Link: http://lkml.kernel.org/r/157867233085.17873.5210928676787339604.stgit@devnote2



Signed-off-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
[ Adjusted data var declaration placement in __kretprobe_trace_func() ]
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent d8d0c245

include/linux/trace_events.h

+1 −0
Original line number Diff line number Diff line
@@ -216,6 +216,7 @@ struct trace_event_buffer { 
	void				*entry;

	unsigned long			flags;

	int				pc;

	struct pt_regs			*regs;

};



void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer,

kernel/trace/trace.c

+2 −2
Original line number Diff line number Diff line
@@ -2680,9 +2680,9 @@ void trace_event_buffer_commit(struct trace_event_buffer *fbuffer) 
	if (static_key_false(&tracepoint_printk_key.key))

		output_printk(fbuffer);



	event_trigger_unlock_commit(fbuffer->trace_file, fbuffer->buffer,

	event_trigger_unlock_commit_regs(fbuffer->trace_file, fbuffer->buffer,

				    fbuffer->event, fbuffer->entry,

				    fbuffer->flags, fbuffer->pc);

				    fbuffer->flags, fbuffer->pc, fbuffer->regs);

}

EXPORT_SYMBOL_GPL(trace_event_buffer_commit);

kernel/trace/trace_events.c

+1 −0
Original line number Diff line number Diff line
@@ -272,6 +272,7 @@ void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, 
	if (!fbuffer->event)

		return NULL;



	fbuffer->regs = NULL;

	fbuffer->entry = ring_buffer_event_data(fbuffer->event);

	return fbuffer->entry;

}

kernel/trace/trace_kprobe.c

+28 −29
Original line number Diff line number Diff line
@@ -1175,35 +1175,35 @@ __kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs, 
		    struct trace_event_file *trace_file)

{

	struct kprobe_trace_entry_head *entry;

	struct trace_buffer *buffer;

	struct ring_buffer_event *event;

	int size, dsize, pc;

	unsigned long irq_flags;

	struct trace_event_call *call = trace_probe_event_call(&tk->tp);

	struct trace_event_buffer fbuffer;

	int dsize;



	WARN_ON(call != trace_file->event_call);



	if (trace_trigger_soft_disabled(trace_file))

		return;



	local_save_flags(irq_flags);

	pc = preempt_count();

	local_save_flags(fbuffer.flags);

	fbuffer.pc = preempt_count();

	fbuffer.trace_file = trace_file;



	dsize = __get_data_size(&tk->tp, regs);

	size = sizeof(*entry) + tk->tp.size + dsize;



	event = trace_event_buffer_lock_reserve(&buffer, trace_file,

	fbuffer.event =

		trace_event_buffer_lock_reserve(&fbuffer.buffer, trace_file,

					call->event.type,

						size, irq_flags, pc);

	if (!event)

					sizeof(*entry) + tk->tp.size + dsize,

					fbuffer.flags, fbuffer.pc);

	if (!fbuffer.event)

		return;



	entry = ring_buffer_event_data(event);

	fbuffer.regs = regs;

	entry = fbuffer.entry = ring_buffer_event_data(fbuffer.event);

	entry->ip = (unsigned long)tk->rp.kp.addr;

	store_trace_args(&entry[1], &tk->tp, regs, sizeof(*entry), dsize);



	event_trigger_unlock_commit_regs(trace_file, buffer, event,

					 entry, irq_flags, pc, regs);

	trace_event_buffer_commit(&fbuffer);

}



static void
@@ -1223,36 +1223,35 @@ __kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri, 
		       struct trace_event_file *trace_file)

{

	struct kretprobe_trace_entry_head *entry;

	struct trace_buffer *buffer;

	struct ring_buffer_event *event;

	int size, pc, dsize;

	unsigned long irq_flags;

	struct trace_event_buffer fbuffer;

	struct trace_event_call *call = trace_probe_event_call(&tk->tp);

	int dsize;



	WARN_ON(call != trace_file->event_call);



	if (trace_trigger_soft_disabled(trace_file))

		return;



	local_save_flags(irq_flags);

	pc = preempt_count();

	local_save_flags(fbuffer.flags);

	fbuffer.pc = preempt_count();

	fbuffer.trace_file = trace_file;



	dsize = __get_data_size(&tk->tp, regs);

	size = sizeof(*entry) + tk->tp.size + dsize;



	event = trace_event_buffer_lock_reserve(&buffer, trace_file,

	fbuffer.event =

		trace_event_buffer_lock_reserve(&fbuffer.buffer, trace_file,

					call->event.type,

						size, irq_flags, pc);

	if (!event)

					sizeof(*entry) + tk->tp.size + dsize,

					fbuffer.flags, fbuffer.pc);

	if (!fbuffer.event)

		return;



	entry = ring_buffer_event_data(event);

	fbuffer.regs = regs;

	entry = fbuffer.entry = ring_buffer_event_data(fbuffer.event);

	entry->func = (unsigned long)tk->rp.kp.addr;

	entry->ret_ip = (unsigned long)ri->ret_addr;

	store_trace_args(&entry[1], &tk->tp, regs, sizeof(*entry), dsize);



	event_trigger_unlock_commit_regs(trace_file, buffer, event,

					 entry, irq_flags, pc, regs);

	trace_event_buffer_commit(&fbuffer);

}



static void

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