Now IPI can interrupt to clock interrupt handler.

It prevents deadlock with TLB shootdown and clock interrupt.
ok miod@

3 files changed, 22 insertions, 15 deletions

diff --git a/sys/arch/mips64/mips64/clock.c b/sys/arch/mips64/mips64/clock.c
index 91c405be630..0cd58d1559c 100644
--- a/sys/arch/mips64/mips64/clock.c
+++ b/sys/arch/mips64/mips64/clock.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: clock.c,v 1.29 2009/11/22 22:15:25 syuu Exp $ */
+/*	$OpenBSD: clock.c,v 1.30 2009/11/26 23:32:46 syuu Exp $ */
 
 /*
  * Copyright (c) 2001-2004 Opsycon AB  (www.opsycon.se / www.opsycon.com)
@@ -117,9 +117,13 @@ clockattach(struct device *parent, struct device *self, void *aux)
 uint32_t
 clock_int5(uint32_t mask, struct trap_frame *tf)
 {
-	u_int32_t clkdiff;
+	u_int32_t clkdiff, sr;
 	struct cpu_info *ci = curcpu();
 
+	/* Enable interrupts at this (hardware) level again */
+	sr = getsr();
+	updateimask(mask);
+
 	/*
 	 * If we got an interrupt before we got ready to process it,
 	 * retrigger it as far as possible. cpu_initclocks() will
@@ -127,6 +131,7 @@ clock_int5(uint32_t mask, struct trap_frame *tf)
 	 */
 	if (ci->ci_clock_started == 0) {
 		cp0_set_compare(cp0_get_count() - 1);
+		setsr(sr);
 		return CR_INT_5;
 	}
 
@@ -158,12 +163,19 @@ clock_int5(uint32_t mask, struct trap_frame *tf)
 	 * Process clock interrupt unless it is currently masked.
 	 */
 	if (tf->ipl < IPL_CLOCK) {
+#ifdef MULTIPROCESSOR
+		__mp_lock(&kernel_lock);
+#endif
 		while (ci->ci_pendingticks) {
 			clk_count.ec_count++;
 			hardclock(tf);
 			ci->ci_pendingticks--;
 		}
+#ifdef MULTIPROCESSOR
+		__mp_unlock(&kernel_lock);
+#endif
 	}
+	setsr(sr);
 
 	return CR_INT_5;	/* Clock is always on 5 */
 }
diff --git a/sys/arch/mips64/mips64/interrupt.c b/sys/arch/mips64/mips64/interrupt.c
index 5f6717b34e1..5bd47a08a4c 100644
--- a/sys/arch/mips64/mips64/interrupt.c
+++ b/sys/arch/mips64/mips64/interrupt.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: interrupt.c,v 1.53 2009/11/22 00:31:03 syuu Exp $ */
+/*	$OpenBSD: interrupt.c,v 1.54 2009/11/26 23:32:46 syuu Exp $ */
 
 /*
  * Copyright (c) 2001-2004 Opsycon AB  (www.opsycon.se / www.opsycon.com)
@@ -114,12 +114,6 @@ interrupt(struct trap_frame *trapframe)
 #ifdef DEBUG_INTERRUPT
 	trapdebug_enter(trapframe, 0);
 #endif
-
-#ifdef MULTIPROCESSOR
-	if (ci->ci_ipl < IPL_SCHED)
-		__mp_lock(&kernel_lock);
-#endif
-
 	uvmexp.intrs++;
 
 	/* Mask out interrupts from cause that are unmasked */
@@ -152,11 +146,6 @@ interrupt(struct trap_frame *trapframe)
 		ci->ci_ipl = s;	/* no-overhead splx */
 		__asm__ ("sync\n\t.set reorder\n");
 	}
-
-#ifdef MULTIPROCESSOR
-	if (ci->ci_ipl < IPL_SCHED)
-		__mp_unlock(&kernel_lock);
-#endif
 }
 
 
diff --git a/sys/arch/mips64/mips64/softintr.c b/sys/arch/mips64/mips64/softintr.c
index c9244cf76e8..354480fe936 100644
--- a/sys/arch/mips64/mips64/softintr.c
+++ b/sys/arch/mips64/mips64/softintr.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: softintr.c,v 1.7 2009/11/22 22:15:25 syuu Exp $	*/
+/*	$OpenBSD: softintr.c,v 1.8 2009/11/26 23:32:46 syuu Exp $	*/
 /*	$NetBSD: softintr.c,v 1.2 2003/07/15 00:24:39 lukem Exp $	*/
 
 /*
@@ -205,6 +205,9 @@ dosoftint()
 	struct cpu_info *ci = curcpu();
 	int sir, q, mask;
 
+	if (ci->ci_ipl < IPL_SCHED)
+		__mp_lock(&kernel_lock);
+
 	while ((sir = ci->ci_softpending) != 0) {
 		atomic_clearbits_int(&ci->ci_softpending, sir);
 
@@ -214,4 +217,7 @@ dosoftint()
 				softintr_dispatch(q);
 		}
 	}
+
+	if (ci->ci_ipl < IPL_SCHED)
+		__mp_unlock(&kernel_lock);
 }