From: Tom Zanussi Date: Mon, 6 Jan 2014 19:44:19 +0000 (-0600) Subject: tracing/kprobes: Add trace event trigger invocations X-Git-Tag: next-20140116~29^2~7 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0641d368f206f2fe7725c9fa5f1461229ef8010f;p=karo-tx-linux.git tracing/kprobes: Add trace event trigger invocations Add code to the kprobe/kretprobe event functions that will invoke any event triggers associated with a probe's ftrace_event_file. The code to do this is very similar to the invocation code already used to invoke the triggers associated with static events and essentially replaces the existing soft-disable checks with a superset that preserves the original behavior but adds the bits needed to support event triggers. Link: http://lkml.kernel.org/r/f2d49f157b608070045fdb26c9564d5a05a5a7d0.1389036657.git.tom.zanussi@linux.intel.com Acked-by: Masami Hiramatsu Signed-off-by: Tom Zanussi Signed-off-by: Steven Rostedt --- diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index ce0ed8afb77e..3afa716d6268 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -929,12 +929,20 @@ __kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs, struct ring_buffer *buffer; int size, dsize, pc; unsigned long irq_flags; + unsigned long eflags; + enum event_trigger_type tt = ETT_NONE; struct ftrace_event_call *call = &tk->tp.call; WARN_ON(call != ftrace_file->event_call); - if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags)) - return; + eflags = ftrace_file->flags; + + if (!(eflags & FTRACE_EVENT_FL_TRIGGER_COND)) { + if (eflags & FTRACE_EVENT_FL_TRIGGER_MODE) + event_triggers_call(ftrace_file, NULL); + if (eflags & FTRACE_EVENT_FL_SOFT_DISABLED) + return; + } local_save_flags(irq_flags); pc = preempt_count(); @@ -952,9 +960,16 @@ __kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs, entry->ip = (unsigned long)tk->rp.kp.addr; store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize); - if (!filter_check_discard(ftrace_file, entry, buffer, event)) + if (eflags & FTRACE_EVENT_FL_TRIGGER_COND) + tt = event_triggers_call(ftrace_file, entry); + + if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags)) + ring_buffer_discard_commit(buffer, event); + else if (!filter_check_discard(ftrace_file, entry, buffer, event)) trace_buffer_unlock_commit_regs(buffer, event, irq_flags, pc, regs); + if (tt) + event_triggers_post_call(ftrace_file, tt); } static __kprobes void @@ -977,12 +992,20 @@ __kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri, struct ring_buffer *buffer; int size, pc, dsize; unsigned long irq_flags; + unsigned long eflags; + enum event_trigger_type tt = ETT_NONE; struct ftrace_event_call *call = &tk->tp.call; WARN_ON(call != ftrace_file->event_call); - if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags)) - return; + eflags = ftrace_file->flags; + + if (!(eflags & FTRACE_EVENT_FL_TRIGGER_COND)) { + if (eflags & FTRACE_EVENT_FL_TRIGGER_MODE) + event_triggers_call(ftrace_file, NULL); + if (eflags & FTRACE_EVENT_FL_SOFT_DISABLED) + return; + } local_save_flags(irq_flags); pc = preempt_count(); @@ -1001,9 +1024,16 @@ __kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri, entry->ret_ip = (unsigned long)ri->ret_addr; store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize); - if (!filter_check_discard(ftrace_file, entry, buffer, event)) + if (eflags & FTRACE_EVENT_FL_TRIGGER_COND) + tt = event_triggers_call(ftrace_file, entry); + + if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags)) + ring_buffer_discard_commit(buffer, event); + else if (!filter_check_discard(ftrace_file, entry, buffer, event)) trace_buffer_unlock_commit_regs(buffer, event, irq_flags, pc, regs); + if (tt) + event_triggers_post_call(ftrace_file, tt); } static __kprobes void