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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>
This commit is contained in:
Marc Zyngier 2013-01-10 11:13:07 +00:00 committed by Mark Rutland
parent c2b01e06a9
commit 8266891e25
1 changed files with 6 additions and 1 deletions
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7
drivers/clocksource/arm_arch_timer.c
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@ -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] ||