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Merge branch 'pmtimer-overflow' into release

This commit is contained in:
Len Brown 2009-04-05 01:39:07 -04:00
parent a3b2c5e413 ff69f2bba6
commit 2ddb9f17ba
1 changed files with 27 additions and 36 deletions
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63
drivers/acpi/processor_idle.c
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@ -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 @@ module_param(nocst, uint, 0000);
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 struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = {
{},
};
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 inline void acpi_idle_do_entry(struct acpi_processor_cx *cx)
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 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev,
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 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev,
{
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 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev,
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 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev,
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 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
{
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 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
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 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
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 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
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 = {