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>

2 files changed, 34 insertions, 3 deletions

diff --git a/include/asm-generic/rtc.h b/include/asm-generic/rtc.h
index cef08db34ada..4087037a4225 100644
--- a/include/asm-generic/rtc.h
+++ b/include/asm-generic/rtc.h
@@ -114,6 +114,7 @@ static inline unsigned int get_rtc_time(struct rtc_time *time)
 /* Set the current date and time in the real time clock. */
 static inline int set_rtc_time(struct rtc_time *time)
 {
+	unsigned long flags;
 	unsigned char mon, day, hrs, min, sec;
 	unsigned char save_control, save_freq_select;
 	unsigned int yrs;
@@ -131,7 +132,7 @@ static inline int set_rtc_time(struct rtc_time *time)
 	if (yrs > 255)	/* They are unsigned */
 		return -EINVAL;
 
-	spin_lock_irq(&rtc_lock);
+	spin_lock_irqsave(&rtc_lock, flags);
 #ifdef CONFIG_MACH_DECSTATION
 	real_yrs = yrs;
 	leap_yr = ((!((yrs + 1900) % 4) && ((yrs + 1900) % 100)) ||
@@ -152,7 +153,7 @@ static inline int set_rtc_time(struct rtc_time *time)
 	 * whether the chip is in binary mode or not.
 	 */
 	if (yrs > 169) {
-		spin_unlock_irq(&rtc_lock);
+		spin_unlock_irqrestore(&rtc_lock, flags);
 		return -EINVAL;
 	}
 
@@ -187,7 +188,7 @@ static inline int set_rtc_time(struct rtc_time *time)
 	CMOS_WRITE(save_control, RTC_CONTROL);
 	CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
 
-	spin_unlock_irq(&rtc_lock);
+	spin_unlock_irqrestore(&rtc_lock, flags);
 
 	return 0;
 }
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