Switch the softinterrupt code on x86 over to mutexes instead of

simplelocks + splhigh().

First part of making it possible to make mpsafe softinterrupts.

"oh yes, definitely" miod@

2 files changed, 14 insertions, 28 deletions

diff --git a/sys/arch/i386/i386/softintr.c b/sys/arch/i386/i386/softintr.c
index 5010e70fdb4..4a9a65a04d4 100644
--- a/sys/arch/i386/i386/softintr.c
+++ b/sys/arch/i386/i386/softintr.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: softintr.c,v 1.2 2008/06/26 05:42:10 ray Exp $	*/
+/*	$OpenBSD: softintr.c,v 1.3 2009/04/19 17:50:18 oga Exp $	*/
 /*	$NetBSD: softintr.c,v 1.1 2003/02/26 21:26:12 fvdl Exp $	*/
 
 /*-
@@ -63,7 +63,7 @@ softintr_init(void)
 	for (i = 0; i < I386_NSOFTINTR; i++) {
 		si = &i386_soft_intrs[i];
 		TAILQ_INIT(&si->softintr_q);
-		simple_lock_init(&si->softintr_slock);
+		mtx_init(&si->softintr_lock, IPL_HIGH);
 		si->softintr_ssir = i386_soft_intr_to_ssir[i];
 	}
 }
@@ -78,18 +78,17 @@ softintr_dispatch(int which)
 {
 	struct i386_soft_intr *si = &i386_soft_intrs[which];
 	struct i386_soft_intrhand *sih;
-	int s;
 
 	for (;;) {
-		i386_softintr_lock(si, s);
+		mtx_enter(&si->softintr_lock);
 		sih = TAILQ_FIRST(&si->softintr_q);
 		if (sih == NULL) {
-			i386_softintr_unlock(si, s);
+			mtx_leave(&si->softintr_lock);
 			break;
 		}
 		TAILQ_REMOVE(&si->softintr_q, sih, sih_q);
 		sih->sih_pending = 0;
-		i386_softintr_unlock(si, s);
+		mtx_leave(&si->softintr_lock);
 
 		uvmexp.softs++;
 		(*sih->sih_fn)(sih->sih_arg);
@@ -148,14 +147,13 @@ softintr_disestablish(void *arg)
 {
 	struct i386_soft_intrhand *sih = arg;
 	struct i386_soft_intr *si = sih->sih_intrhead;
-	int s;
 
-	i386_softintr_lock(si, s);
+	mtx_enter(&si->softintr_lock);
 	if (sih->sih_pending) {
 		TAILQ_REMOVE(&si->softintr_q, sih, sih_q);
 		sih->sih_pending = 0;
 	}
-	i386_softintr_unlock(si, s);
+	mtx_leave(&si->softintr_lock);
 
 	free(sih, M_DEVBUF);
 }
diff --git a/sys/arch/i386/include/intr.h b/sys/arch/i386/include/intr.h
index 812af4d74d1..fd5f02fa4af 100644
--- a/sys/arch/i386/include/intr.h
+++ b/sys/arch/i386/include/intr.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: intr.h,v 1.37 2009/03/15 19:40:40 miod Exp $	*/
+/*	$OpenBSD: intr.h,v 1.38 2009/04/19 17:50:18 oga Exp $	*/
 /*	$NetBSD: intr.h,v 1.5 1996/05/13 06:11:28 mycroft Exp $	*/
 
 /*
@@ -36,6 +36,7 @@
 #include <machine/intrdefs.h>
 
 #ifndef _LOCORE
+#include <sys/mutex.h>
 #include <machine/cpu.h>
 
 extern volatile u_int32_t lapic_tpr;	/* Current interrupt priority level. */
@@ -170,23 +171,11 @@ struct i386_soft_intrhand {
 
 struct i386_soft_intr {
 	TAILQ_HEAD(, i386_soft_intrhand)
-		softintr_q;
-	int softintr_ssir;
-	struct simplelock softintr_slock;
+			softintr_q;
+	int		softintr_ssir;
+	struct mutex	softintr_lock;
 };
 
-#define	i386_softintr_lock(si, s)					\
-do {									\
-	(s) = splhigh();						\
-	simple_lock(&si->softintr_slock);				\
-} while (/*CONSTCOND*/ 0)
-
-#define	i386_softintr_unlock(si, s)					\
-do {									\
-	simple_unlock(&si->softintr_slock);				\
-	splx((s));							\
-} while (/*CONSTCOND*/ 0)
-
 void	*softintr_establish(int, void (*)(void *), void *);
 void	softintr_disestablish(void *);
 void	softintr_init(void);
@@ -196,15 +185,14 @@ void	softintr_dispatch(int);
 do {									\
 	struct i386_soft_intrhand *__sih = (arg);			\
 	struct i386_soft_intr *__si = __sih->sih_intrhead;		\
-	int __s;							\
 									\
-	i386_softintr_lock(__si, __s);					\
+	mtx_enter(&__si->softintr_lock);				\
 	if (__sih->sih_pending == 0) {					\
 		TAILQ_INSERT_TAIL(&__si->softintr_q, __sih, sih_q);	\
 		__sih->sih_pending = 1;					\
 		softintr(__si->softintr_ssir);				\
 	}								\
-	i386_softintr_unlock(__si, __s);					\
+	mtx_leave(&__si->softintr_lock);				\
 } while (/*CONSTCOND*/ 0)
 #endif /* _LOCORE */