diff options
Diffstat (limited to 'arch/powerpc/kernel/time.c')
| -rw-r--r-- | arch/powerpc/kernel/time.c | 91 |
1 files changed, 68 insertions, 23 deletions
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index a925a8eae12..5cd3db5cae4 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -116,9 +116,12 @@ static struct clock_event_device decrementer_clockevent = { .features = CLOCK_EVT_FEAT_ONESHOT, }; -static DEFINE_PER_CPU(struct clock_event_device, decrementers); -void init_decrementer_clockevent(void); -static DEFINE_PER_CPU(u64, decrementer_next_tb); +struct decrementer_clock { + struct clock_event_device event; + u64 next_tb; +}; + +static DEFINE_PER_CPU(struct decrementer_clock, decrementers); #ifdef CONFIG_PPC_ISERIES static unsigned long __initdata iSeries_recal_titan; @@ -216,7 +219,11 @@ static u64 read_purr(void) */ static u64 read_spurr(u64 purr) { - if (cpu_has_feature(CPU_FTR_SPURR)) + /* + * cpus without PURR won't have a SPURR + * We already know the former when we use this, so tell gcc + */ + if (cpu_has_feature(CPU_FTR_PURR) && cpu_has_feature(CPU_FTR_SPURR)) return mfspr(SPRN_SPURR); return purr; } @@ -227,29 +234,30 @@ static u64 read_spurr(u64 purr) */ void account_system_vtime(struct task_struct *tsk) { - u64 now, nowscaled, delta, deltascaled; + u64 now, nowscaled, delta, deltascaled, sys_time; unsigned long flags; local_irq_save(flags); now = read_purr(); - delta = now - get_paca()->startpurr; - get_paca()->startpurr = now; nowscaled = read_spurr(now); + delta = now - get_paca()->startpurr; deltascaled = nowscaled - get_paca()->startspurr; + get_paca()->startpurr = now; get_paca()->startspurr = nowscaled; if (!in_interrupt()) { /* deltascaled includes both user and system time. * Hence scale it based on the purr ratio to estimate * the system time */ + sys_time = get_paca()->system_time; if (get_paca()->user_time) - deltascaled = deltascaled * get_paca()->system_time / - (get_paca()->system_time + get_paca()->user_time); - delta += get_paca()->system_time; + deltascaled = deltascaled * sys_time / + (sys_time + get_paca()->user_time); + delta += sys_time; get_paca()->system_time = 0; } account_system_time(tsk, 0, delta); - get_paca()->purrdelta = delta; account_system_time_scaled(tsk, deltascaled); + get_paca()->purrdelta = delta; get_paca()->spurrdelta = deltascaled; local_irq_restore(flags); } @@ -326,11 +334,9 @@ void calculate_steal_time(void) s64 stolen; struct cpu_purr_data *pme; - if (!cpu_has_feature(CPU_FTR_PURR)) - return; - pme = &per_cpu(cpu_purr_data, smp_processor_id()); + pme = &__get_cpu_var(cpu_purr_data); if (!pme->initialized) - return; /* this can happen in early boot */ + return; /* !CPU_FTR_PURR or early in early boot */ tb = mftb(); purr = mfspr(SPRN_PURR); stolen = (tb - pme->tb) - (purr - pme->purr); @@ -353,7 +359,7 @@ static void snapshot_purr(void) if (!cpu_has_feature(CPU_FTR_PURR)) return; local_irq_save(flags); - pme = &per_cpu(cpu_purr_data, smp_processor_id()); + pme = &__get_cpu_var(cpu_purr_data); pme->tb = mftb(); pme->purr = mfspr(SPRN_PURR); pme->initialized = 1; @@ -556,8 +562,8 @@ void __init iSeries_time_init_early(void) void timer_interrupt(struct pt_regs * regs) { struct pt_regs *old_regs; - int cpu = smp_processor_id(); - struct clock_event_device *evt = &per_cpu(decrementers, cpu); + struct decrementer_clock *decrementer = &__get_cpu_var(decrementers); + struct clock_event_device *evt = &decrementer->event; u64 now; /* Ensure a positive value is written to the decrementer, or else @@ -570,9 +576,9 @@ void timer_interrupt(struct pt_regs * regs) #endif now = get_tb_or_rtc(); - if (now < per_cpu(decrementer_next_tb, cpu)) { + if (now < decrementer->next_tb) { /* not time for this event yet */ - now = per_cpu(decrementer_next_tb, cpu) - now; + now = decrementer->next_tb - now; if (now <= DECREMENTER_MAX) set_dec((int)now); return; @@ -623,6 +629,45 @@ void wakeup_decrementer(void) set_dec(ticks); } +#ifdef CONFIG_SUSPEND +void generic_suspend_disable_irqs(void) +{ + preempt_disable(); + + /* Disable the decrementer, so that it doesn't interfere + * with suspending. + */ + + set_dec(0x7fffffff); + local_irq_disable(); + set_dec(0x7fffffff); +} + +void generic_suspend_enable_irqs(void) +{ + wakeup_decrementer(); + + local_irq_enable(); + preempt_enable(); +} + +/* Overrides the weak version in kernel/power/main.c */ +void arch_suspend_disable_irqs(void) +{ + if (ppc_md.suspend_disable_irqs) + ppc_md.suspend_disable_irqs(); + generic_suspend_disable_irqs(); +} + +/* Overrides the weak version in kernel/power/main.c */ +void arch_suspend_enable_irqs(void) +{ + generic_suspend_enable_irqs(); + if (ppc_md.suspend_enable_irqs) + ppc_md.suspend_enable_irqs(); +} +#endif + #ifdef CONFIG_SMP void __init smp_space_timers(unsigned int max_cpus) { @@ -811,7 +856,7 @@ void __init clocksource_init(void) static int decrementer_set_next_event(unsigned long evt, struct clock_event_device *dev) { - __get_cpu_var(decrementer_next_tb) = get_tb_or_rtc() + evt; + __get_cpu_var(decrementers).next_tb = get_tb_or_rtc() + evt; set_dec(evt); return 0; } @@ -825,7 +870,7 @@ static void decrementer_set_mode(enum clock_event_mode mode, static void register_decrementer_clockevent(int cpu) { - struct clock_event_device *dec = &per_cpu(decrementers, cpu); + struct clock_event_device *dec = &per_cpu(decrementers, cpu).event; *dec = decrementer_clockevent; dec->cpumask = cpumask_of_cpu(cpu); @@ -836,7 +881,7 @@ static void register_decrementer_clockevent(int cpu) clockevents_register_device(dec); } -void init_decrementer_clockevent(void) +static void __init init_decrementer_clockevent(void) { int cpu = smp_processor_id(); |