Merge branch 'pmtimer-overflow' into release
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 397f2a7..4e6e758 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -64,7 +64,6 @@
#define _COMPONENT ACPI_PROCESSOR_COMPONENT
ACPI_MODULE_NAME("processor_idle");
#define ACPI_PROCESSOR_FILE_POWER "power"
-#define US_TO_PM_TIMER_TICKS(t) ((t * (PM_TIMER_FREQUENCY/1000)) / 1000)
#define PM_TIMER_TICK_NS (1000000000ULL/PM_TIMER_FREQUENCY)
#define C2_OVERHEAD 1 /* 1us */
#define C3_OVERHEAD 1 /* 1us */
@@ -78,6 +77,10 @@
static unsigned int latency_factor __read_mostly = 2;
module_param(latency_factor, uint, 0644);
+static s64 us_to_pm_timer_ticks(s64 t)
+{
+ return div64_u64(t * PM_TIMER_FREQUENCY, 1000000);
+}
/*
* IBM ThinkPad R40e crashes mysteriously when going into C2 or C3.
* For now disable this. Probably a bug somewhere else.
@@ -108,25 +111,6 @@
{},
};
-static inline u32 ticks_elapsed(u32 t1, u32 t2)
-{
- if (t2 >= t1)
- return (t2 - t1);
- else if (!(acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER))
- return (((0x00FFFFFF - t1) + t2) & 0x00FFFFFF);
- else
- return ((0xFFFFFFFF - t1) + t2);
-}
-
-static inline u32 ticks_elapsed_in_us(u32 t1, u32 t2)
-{
- if (t2 >= t1)
- return PM_TIMER_TICKS_TO_US(t2 - t1);
- else if (!(acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER))
- return PM_TIMER_TICKS_TO_US(((0x00FFFFFF - t1) + t2) & 0x00FFFFFF);
- else
- return PM_TIMER_TICKS_TO_US((0xFFFFFFFF - t1) + t2);
-}
/*
* Callers should disable interrupts before the call and enable
@@ -802,7 +786,8 @@
static int acpi_idle_enter_c1(struct cpuidle_device *dev,
struct cpuidle_state *state)
{
- u32 t1, t2;
+ ktime_t kt1, kt2;
+ s64 idle_time;
struct acpi_processor *pr;
struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
@@ -820,14 +805,15 @@
return 0;
}
- t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+ kt1 = ktime_get_real();
acpi_idle_do_entry(cx);
- t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+ kt2 = ktime_get_real();
+ idle_time = ktime_to_us(ktime_sub(kt2, kt1));
local_irq_enable();
cx->usage++;
- return ticks_elapsed_in_us(t1, t2);
+ return idle_time;
}
/**
@@ -840,8 +826,9 @@
{
struct acpi_processor *pr;
struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
- u32 t1, t2;
- int sleep_ticks = 0;
+ ktime_t kt1, kt2;
+ s64 idle_time;
+ s64 sleep_ticks = 0;
pr = __get_cpu_var(processors);
@@ -874,18 +861,19 @@
if (cx->type == ACPI_STATE_C3)
ACPI_FLUSH_CPU_CACHE();
- t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+ kt1 = ktime_get_real();
/* Tell the scheduler that we are going deep-idle: */
sched_clock_idle_sleep_event();
acpi_idle_do_entry(cx);
- t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+ kt2 = ktime_get_real();
+ idle_time = ktime_to_us(ktime_sub(kt2, kt1));
#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
/* TSC could halt in idle, so notify users */
if (tsc_halts_in_c(cx->type))
mark_tsc_unstable("TSC halts in idle");;
#endif
- sleep_ticks = ticks_elapsed(t1, t2);
+ sleep_ticks = us_to_pm_timer_ticks(idle_time);
/* Tell the scheduler how much we idled: */
sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
@@ -897,7 +885,7 @@
acpi_state_timer_broadcast(pr, cx, 0);
cx->time += sleep_ticks;
- return ticks_elapsed_in_us(t1, t2);
+ return idle_time;
}
static int c3_cpu_count;
@@ -915,8 +903,10 @@
{
struct acpi_processor *pr;
struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
- u32 t1, t2;
- int sleep_ticks = 0;
+ ktime_t kt1, kt2;
+ s64 idle_time;
+ s64 sleep_ticks = 0;
+
pr = __get_cpu_var(processors);
@@ -983,9 +973,10 @@
ACPI_FLUSH_CPU_CACHE();
}
- t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+ kt1 = ktime_get_real();
acpi_idle_do_entry(cx);
- t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+ kt2 = ktime_get_real();
+ idle_time = ktime_to_us(ktime_sub(kt2, kt1));
/* Re-enable bus master arbitration */
if (pr->flags.bm_check && pr->flags.bm_control) {
@@ -1000,7 +991,7 @@
if (tsc_halts_in_c(ACPI_STATE_C3))
mark_tsc_unstable("TSC halts in idle");
#endif
- sleep_ticks = ticks_elapsed(t1, t2);
+ sleep_ticks = us_to_pm_timer_ticks(idle_time);
/* Tell the scheduler how much we idled: */
sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
@@ -1011,7 +1002,7 @@
acpi_state_timer_broadcast(pr, cx, 0);
cx->time += sleep_ticks;
- return ticks_elapsed_in_us(t1, t2);
+ return idle_time;
}
struct cpuidle_driver acpi_idle_driver = {