[patch 3/6] x86, ftrace, hw-branch-tracer: dump trace on oops

[Markus Metzger]

Dump the branch trace on an oops (based on ftrace_dump_on_oops).

Signed-off-by: Markus Metzger <markus.t.metzger@xxxxxxxxx>
---

Index: ftrace/arch/x86/kernel/dumpstack.c
===================================================================
--- ftrace.orig/arch/x86/kernel/dumpstack.c	2009-01-16 15:52:35.000000000 +0100
+++ ftrace/arch/x86/kernel/dumpstack.c	2009-01-16 16:19:36.000000000 +0100
@@ -14,6 +14,7 @@
 #include <linux/bug.h>
 #include <linux/nmi.h>
 #include <linux/sysfs.h>
+#include <linux/ftrace.h>
 
 #include <asm/stacktrace.h>
 
@@ -195,6 +196,11 @@
 	int cpu;
 	unsigned long flags;
 
+	/* notify the hw-branch tracer so it may disable tracing and
+	   add the last trace to the trace buffer -
+	   the earlier this happens, the more useful the trace. */
+	trace_hw_branch_oops();
+
 	oops_enter();
 
 	/* racy, but better than risking deadlock. */
Index: ftrace/kernel/trace/trace.h
===================================================================
--- ftrace.orig/kernel/trace/trace.h	2009-01-16 15:52:35.000000000 +0100
+++ ftrace/kernel/trace/trace.h	2009-01-16 16:19:36.000000000 +0100
@@ -415,7 +415,6 @@
 
 void trace_graph_return(struct ftrace_graph_ret *trace);
 int trace_graph_entry(struct ftrace_graph_ent *trace);
-void trace_hw_branch(struct trace_array *tr, u64 from, u64 to);
 
 void tracing_start_cmdline_record(void);
 void tracing_stop_cmdline_record(void);
Index: ftrace/kernel/trace/trace_hw_branches.c
===================================================================
--- ftrace.orig/kernel/trace/trace_hw_branches.c	2009-01-16 16:19:35.000000000 +0100
+++ ftrace/kernel/trace/trace_hw_branches.c	2009-01-16 16:20:04.000000000 +0100
@@ -39,6 +39,7 @@
 #define this_buffer per_cpu(buffer, smp_processor_id())
 
 static int __read_mostly trace_hw_branches_enabled;
+static struct trace_array *hw_branch_trace __read_mostly;
 
 
 /*
@@ -127,6 +128,8 @@
 
 static int bts_trace_init(struct trace_array *tr)
 {
+	hw_branch_trace = tr;
+
 	register_hotcpu_notifier(&bts_hotcpu_notifier);
 	tracing_reset_online_cpus(tr);
 	bts_trace_start(tr);
@@ -166,8 +169,9 @@
 	return TRACE_TYPE_UNHANDLED;
 }
 
-void trace_hw_branch(struct trace_array *tr, u64 from, u64 to)
+void trace_hw_branch(u64 from, u64 to)
 {
+	struct trace_array *tr = hw_branch_trace;
 	struct ring_buffer_event *event;
 	struct hw_branch_entry *entry;
 	unsigned long irq1, irq2;
@@ -200,8 +204,7 @@
 	local_irq_restore(irq1);
 }
 
-static void trace_bts_at(struct trace_array *tr,
-			 const struct bts_trace *trace, void *at)
+static void trace_bts_at(const struct bts_trace *trace, void *at)
 {
 	struct bts_struct bts;
 	int err = 0;
@@ -216,7 +219,7 @@
 
 	switch (bts.qualifier) {
 	case BTS_BRANCH:
-		trace_hw_branch(tr, bts.variant.lbr.from, bts.variant.lbr.to);
+		trace_hw_branch(bts.variant.lbr.from, bts.variant.lbr.to);
 		break;
 	}
 }
@@ -232,12 +235,15 @@
 	const struct bts_trace *trace;
 	unsigned char *at;
 
-	if (!this_tracer)
+	if (unlikely(!tr))
 		return;
 
 	if (unlikely(atomic_read(&tr->data[raw_smp_processor_id()]->disabled)))
 		return;
 
+	if (unlikely(!this_tracer))
+		return;
+
 	ds_suspend_bts(this_tracer);
 	trace = ds_read_bts(this_tracer);
 	if (!trace)
@@ -245,11 +251,11 @@
 
 	for (at = trace->ds.top; (void *)at < trace->ds.end;
 	     at += trace->ds.size)
-		trace_bts_at(tr, trace, at);
+		trace_bts_at(trace, at);
 
 	for (at = trace->ds.begin; (void *)at < trace->ds.top;
 	     at += trace->ds.size)
-		trace_bts_at(tr, trace, at);
+		trace_bts_at(trace, at);
 
 out:
 	ds_resume_bts(this_tracer);
@@ -264,6 +270,15 @@
 	mutex_unlock(&bts_tracer_mutex);
 }
 
+void trace_hw_branch_oops(void)
+{
+	mutex_lock(&bts_tracer_mutex);
+
+	trace_bts_cpu(hw_branch_trace);
+
+	mutex_unlock(&bts_tracer_mutex);
+}
+
 struct tracer bts_tracer __read_mostly =
 {
 	.name		= "hw-branch-tracer",
Index: ftrace/include/linux/ftrace.h
===================================================================
--- ftrace.orig/include/linux/ftrace.h	2009-01-16 15:52:35.000000000 +0100
+++ ftrace/include/linux/ftrace.h	2009-01-16 16:19:36.000000000 +0100
@@ -492,4 +492,17 @@
 
 #endif /* CONFIG_TRACING */
 
+
+#ifdef CONFIG_HW_BRANCH_TRACER
+
+void trace_hw_branch(u64 from, u64 to);
+void trace_hw_branch_oops(void);
+
+#else /* CONFIG_HW_BRANCH_TRACER */
+
+static inline void trace_hw_branch(u64 from, u64 to) {}
+static inline void trace_hw_branch_oops(void) {}
+
+#endif /* CONFIG_HW_BRANCH_TRACER */
+
 #endif /* _LINUX_FTRACE_H */
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