drm: use hi-res time to implement ktime_get(), ktime_get_real()

There seems to have been some confusion about the granularity of
certain time interfaces in the Linux kernel when our DRM compatibility
layer was written.

To be clear: the Linux ktime_get() and ktime_get_real() interfaces are
*high resolution* clocks.  We should to implement them with high
resolution interfaces from our own kernel.

Thus, use microuptime(9) to implement ktime_get() and microtime(9) to
implement ktime_get_real().

While here, ktime_get_raw_ns() should use ktime_get_raw(), not
ktime_get().

Discussed with kettenis@ and jsg@.

ok jsg@

2 files changed, 4 insertions, 4 deletions

diff --git a/sys/dev/pci/drm/include/linux/ktime.h b/sys/dev/pci/drm/include/linux/ktime.h
index 8edf0205069..4e744bd9e66 100644
--- a/sys/dev/pci/drm/include/linux/ktime.h
+++ b/sys/dev/pci/drm/include/linux/ktime.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ktime.h,v 1.3 2020/06/29 08:42:00 jsg Exp $	*/
+/*	$OpenBSD: ktime.h,v 1.4 2020/07/07 04:05:25 cheloha Exp $	*/
 /*
  * Copyright (c) 2013, 2014, 2015 Mark Kettenis
  *
@@ -29,7 +29,7 @@ ktime_get(void)
 {
 	struct timeval tv;
 	
-	getmicrouptime(&tv);
+	microuptime(&tv);
 	return tv;
 }
 
@@ -63,7 +63,7 @@ ktime_to_ns(struct timeval tv)
 static inline int64_t
 ktime_get_raw_ns(void)
 {
-	return ktime_to_ns(ktime_get());
+	return ktime_to_ns(ktime_get_raw());
 }
 
 static inline struct timespec64
diff --git a/sys/dev/pci/drm/include/linux/timekeeping.h b/sys/dev/pci/drm/include/linux/timekeeping.h
index ea19385fad6..a2a6828e966 100644
--- a/sys/dev/pci/drm/include/linux/timekeeping.h
+++ b/sys/dev/pci/drm/include/linux/timekeeping.h
@@ -16,7 +16,7 @@ static inline struct timeval
 ktime_get_real(void)
 {
 	struct timeval tv;
-	getmicrotime(&tv);
+	microtime(&tv);
 	return tv;
 }