add hrtimer_forward_now() for 6.18.34 drm

sys/dev/pci/drm/drm_linux.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: drm_linux.c,v 1.137 2026/04/28 03:44:14 jsg Exp $	*/
+/*	$OpenBSD: drm_linux.c,v 1.138 2026/06/02 03:17:28 jsg Exp $	*/
 /*
  * Copyright (c) 2013 Jonathan Gray <jsg@openbsd.org>
  * Copyright (c) 2015, 2016 Mark Kettenis <kettenis@openbsd.org>
@@ -3650,6 +3650,19 @@ seq_buf_printf(struct seq_buf *s, const char *fmt, ...)
 	}
 }
 
+u64
+hrtimer_forward_now(struct timeout *to, ktime_t val)
+{
+	struct timespec now, ts;
+
+	getnanotime(&now);
+	NSEC_TO_TIMESPEC(ktime_to_ns(val), &ts);
+	timespecadd(&ts, &now, &ts);
+	timeout_abs_ts(to, &ts);
+
+	return 0;
+}
+
 #ifdef __HAVE_FDT
 
 #include <dev/ofw/openfirm.h>

sys/dev/pci/drm/include/linux/hrtimer.h

@@ -3,10 +3,11 @@
 #ifndef _LINUX_HRTIMER_H
 #define _LINUX_HRTIMER_H
 
-#include <sys/types.h>
-#include <sys/timeout.h>
+#include <linux/types.h>
 #include <linux/rbtree.h>
 
+#include <sys/timeout.h>
+
 enum hrtimer_restart { HRTIMER_NORESTART, HRTIMER_RESTART };
 struct hrtimer {
 	enum hrtimer_restart	(*function)(struct hrtimer *);
@@ -18,4 +19,6 @@ struct hrtimer {
 #define hrtimer_try_to_cancel(x)	timeout_del(x)	/* XXX ret -1 if running */
 #define hrtimer_active(x)		timeout_pending(x)
 
+u64 hrtimer_forward_now(struct timeout *, ktime_t);
+
 #endif