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authorMarc Zyngier <Marc.Zyngier@arm.com>2013-01-10 15:13:07 +0400
committerMark Rutland <mark.rutland@arm.com>2013-01-31 19:52:00 +0400
commit8266891e252f35dcb189c3f2371cfa588f8a8818 (patch)
treea708f74df24a68dc2d2560a45f4e543f77e6baa9 /drivers/clocksource
parentc2b01e06a9c97cf21ad44b91b3280b0797839a62 (diff)
downloadlinux-8266891e252f35dcb189c3f2371cfa588f8a8818.tar.xz
ARM: arch_timers: switch to physical timers if HYP mode is available
If we're booted in HYP mode, it is possible that we'll run some kind of virtualized environment. In this case, it is a better to switch to the physical timers, and leave the virtual timers to guests. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'drivers/clocksource')
-rw-r--r--drivers/clocksource/arm_arch_timer.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index ec30a7331587..d7ad425ab9b3 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -19,6 +19,7 @@
#include <linux/io.h>
#include <asm/arch_timer.h>
+#include <asm/virt.h>
#include <clocksource/arm_arch_timer.h>
@@ -364,10 +365,14 @@ int __init arch_timer_init(void)
of_node_put(np);
/*
+ * If HYP mode is available, we know that the physical timer
+ * has been configured to be accessible from PL1. Use it, so
+ * that a guest can use the virtual timer instead.
+ *
* If no interrupt provided for virtual timer, we'll have to
* stick to the physical timer. It'd better be accessible...
*/
- if (!arch_timer_ppi[VIRT_PPI]) {
+ if (is_hyp_mode_available() || !arch_timer_ppi[VIRT_PPI]) {
arch_timer_use_virtual = false;
if (!arch_timer_ppi[PHYS_SECURE_PPI] ||