clocksource: arch_timer: use virtual counters

Switching between reading the virtual or physical counters is
problematic, as some core code wants a view of time before we're fully
set up. Using a function pointer and switching the source after the
first read can make time appear to go backwards, and having a check in
the read function is an unfortunate block on what we want to be a fast
path.

Instead, this patch makes us always use the virtual counters. If we're a
guest, or don't have hyp mode, we'll use the virtual timers, and as such
don't care about CNTVOFF as long as it doesn't change in such a way as
to make time appear to travel backwards. As the guest will use the
virtual timers, a (potential) KVM host must use the physical timers
(which can wake up the host even if they fire while a guest is
executing), and hence a host must have CNTVOFF set to zero so as to have
a consistent view of time between the physical timers and virtual
counters.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Rob Herring <rob.herring@calxeda.com>

4 files changed, 6 insertions, 38 deletions

diff --git a/arch/arm/include/asm/arch_timer.h b/arch/arm/include/asm/arch_timer.h
index 7c1bfc0aea0c..accefe099182 100644
--- a/arch/arm/include/asm/arch_timer.h
+++ b/arch/arm/include/asm/arch_timer.h
@@ -80,15 +80,6 @@ static inline u32 arch_timer_get_cntfrq(void)
         return val;
 }
 
-static inline u64 arch_counter_get_cntpct(void)
-{
-        u64 cval;
-
-        isb();
-        asm volatile("mrrc p15, 0, %Q0, %R0, c14" : "=r" (cval));
-        return cval;
-}
-
 static inline u64 arch_counter_get_cntvct(void)
 {
         u64 cval;
diff --git a/arch/arm64/include/asm/arch_timer.h b/arch/arm64/include/asm/arch_timer.h
index bf6ab242f047..d56ed11ba9a3 100644
--- a/arch/arm64/include/asm/arch_timer.h
+++ b/arch/arm64/include/asm/arch_timer.h
@@ -110,16 +110,6 @@ static inline void __cpuinit arch_counter_set_user_access(void)
         asm volatile("msr       cntkctl_el1, %0" : : "r" (cntkctl));
 }
 
-static inline u64 arch_counter_get_cntpct(void)
-{
-        u64 cval;
-
-        isb();
-        asm volatile("mrs %0, cntpct_el0" : "=r" (cval));
-
-        return cval;
-}
-
 static inline u64 arch_counter_get_cntvct(void)
 {
         u64 cval;
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index a2b254189782..053d846ab5b1 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -186,27 +186,19 @@ u32 arch_timer_get_rate(void)
         return arch_timer_rate;
 }
 
-/*
- * Some external users of arch_timer_read_counter (e.g. sched_clock) may try to
- * call it before it has been initialised. Rather than incur a performance
- * penalty checking for initialisation, provide a default implementation that
- * won't lead to time appearing to jump backwards.
- */
-static u64 arch_timer_read_zero(void)
+u64 arch_timer_read_counter(void)
 {
-        return 0;
+        return arch_counter_get_cntvct();
 }
 
-u64 (*arch_timer_read_counter)(void) = arch_timer_read_zero;
-
 static cycle_t arch_counter_read(struct clocksource *cs)
 {
-        return arch_timer_read_counter();
+        return arch_counter_get_cntvct();
 }
 
 static cycle_t arch_counter_read_cc(const struct cyclecounter *cc)
 {
-        return arch_timer_read_counter();
+        return arch_counter_get_cntvct();
 }
 
 static struct clocksource clocksource_counter = {
@@ -287,7 +279,7 @@ static int __init arch_timer_register(void)
         cyclecounter.mult = clocksource_counter.mult;
         cyclecounter.shift = clocksource_counter.shift;
         timecounter_init(&timecounter, &cyclecounter,
-                         arch_counter_get_cntpct());
+                         arch_counter_get_cntvct());
 
         if (arch_timer_use_virtual) {
                 ppi = arch_timer_ppi[VIRT_PPI];
@@ -376,11 +368,6 @@ static void __init arch_timer_init(struct device_node *np)
                 }
         }
 
-        if (arch_timer_use_virtual)
-                arch_timer_read_counter = arch_counter_get_cntvct;
-        else
-                arch_timer_read_counter = arch_counter_get_cntpct;
-
         arch_timer_register();
         arch_timer_arch_init();
 }
diff --git a/include/clocksource/arm_arch_timer.h b/include/clocksource/arm_arch_timer.h
index e6c9c4cc9b23..c463ce990c48 100644
--- a/include/clocksource/arm_arch_timer.h
+++ b/include/clocksource/arm_arch_timer.h
@@ -32,7 +32,7 @@
 #ifdef CONFIG_ARM_ARCH_TIMER
 
 extern u32 arch_timer_get_rate(void);
-extern u64 (*arch_timer_read_counter)(void);
+extern u64 arch_timer_read_counter(void);
 extern struct timecounter *arch_timer_get_timecounter(void);
 
 #else