From: Takao Shinohara <shin@sm.sony.co.jp>
Date: Mon, 30 Apr 2007 21:01:07 +0000 (+1000)
Subject: [POWERPC] PS3: Fix system slowdown
X-Git-Tag: v2.6.22-rc1~358^2~54
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0874dd40bf3c1f291da14b2c554c5640c0b6bf1b;p=linux-2.6

[POWERPC] PS3: Fix system slowdown

The PS3 HV will deliver soft-disabled interrupts at the next HV call or
interrupt.  Add an HV call to local_irq_restore() to force the timely
delivery of any pending interrupts.

This fixes the system slowdown bug reported here
http://bugzilla.kernel.org/show_bug.cgi?id=8260

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
---

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 6c83fe229e..5719a530f2 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -67,6 +67,7 @@
 #ifdef CONFIG_PPC64
 #include <asm/paca.h>
 #include <asm/firmware.h>
+#include <asm/lv1call.h>
 #endif
 
 int __irq_offset_value;
@@ -162,6 +163,16 @@ void local_irq_restore(unsigned long en)
 	local_paca->hard_enabled = en;
 	if ((int)mfspr(SPRN_DEC) < 0)
 		mtspr(SPRN_DEC, 1);
+
+	/*
+	 * Force the delivery of pending soft-disabled interrupts on PS3.
+	 * Any HV call will have this side effect.
+	 */
+	if (firmware_has_feature(FW_FEATURE_PS3_LV1)) {
+		u64 tmp;
+		lv1_get_version_info(&tmp);
+	}
+
 	hard_irq_enable();
 }
 #endif /* CONFIG_PPC64 */