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>

1 files changed, 30 insertions, 0 deletions

diff --git a/include/linux/resume-trace.h b/include/linux/resume-trace.h
new file mode 100644
index 000000000000..a376bd4ade39
--- /dev/null
+++ b/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