Add some basic resume trace facilities

Considering that there isn't a lot of hw we can depend on during resume,
this is about as good as it gets.

This is x86-only for now, although the basic concept (and most of the
code) will certainly work on almost any platform.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/resume-trace.h

@@ -0,0 +1,30 @@
+#ifndef RESUME_TRACE_H
+#define RESUME_TRACE_H
+
+#ifdef CONFIG_PM_TRACE
+
+struct device;
+extern void set_trace_device(struct device *);
+extern void generate_resume_trace(void *tracedata, unsigned int user);
+
+#define TRACE_DEVICE(dev) set_trace_device(dev)
+#define TRACE_RESUME(user) do {				\
+	void *tracedata;				\
+	asm volatile("movl $1f,%0\n"			\
+		".section .tracedata,\"a\"\n"		\
+		"1:\t.word %c1\n"			\
+		"\t.long %c2\n"				\
+		".previous"				\
+		:"=r" (tracedata)			\
+		: "i" (__LINE__), "i" (__FILE__));	\
+	generate_resume_trace(tracedata, user);		\
+} while (0)
+
+#else
+
+#define TRACE_DEVICE(dev) do { } while (0)
+#define TRACE_RESUME(dev) do { } while (0)
+
+#endif
+
+#endif