From e1a9c16b303725ac900fee2a3ec4dbe2c2f846ab Mon Sep 17 00:00:00 2001
From: Julien Grall <julien.grall@linaro.org>
Date: Mon, 9 Sep 2013 11:35:26 +0000
Subject: xen/arm: disable cpuidle and cpufreq when linux is running as dom0

When linux is running as dom0, Xen doesn't show the physical cpu but a
virtual CPU.
On some ARM SOC (for instance the exynos 5250), linux registers callbacks
for cpuidle and cpufreq. When these callbacks are called, they will modify
directly the physical cpu not the virtual one. It can impact the whole board
instead of only dom0.

Signed-off-by: Julien Grall <julien.grall@linaro.org>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 arch/arm/xen/enlighten.c | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'arch/arm/xen/enlighten.c')

diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index e70ce04e9dad..79b317a5e480 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -21,6 +21,8 @@
 #include <linux/of.h>
 #include <linux/of_irq.h>
 #include <linux/of_address.h>
+#include <linux/cpuidle.h>
+#include <linux/cpufreq.h>
 
 #include <linux/mm.h>
 
@@ -266,6 +268,13 @@ static int __init xen_guest_init(void)
 	if (!xen_initial_domain())
 		xenbus_probe(NULL);
 
+	/*
+	 * Making sure board specific code will not set up ops for
+	 * cpu idle and cpu freq.
+	 */
+	disable_cpuidle();
+	disable_cpufreq();
+
 	return 0;
 }
 core_initcall(xen_guest_init);
-- 
cgit