diff options
Diffstat (limited to 'arch/arm/kernel/smp.c')
| -rw-r--r-- | arch/arm/kernel/smp.c | 64 |
1 files changed, 52 insertions, 12 deletions
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index ece658e773a6..de885fd256c5 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -22,17 +22,20 @@ #include <linux/smp.h> #include <linux/seq_file.h> #include <linux/irq.h> +#include <linux/percpu.h> +#include <linux/clockchips.h> #include <asm/atomic.h> #include <asm/cacheflush.h> #include <asm/cpu.h> +#include <asm/cputype.h> #include <asm/mmu_context.h> #include <asm/pgtable.h> #include <asm/pgalloc.h> #include <asm/processor.h> #include <asm/tlbflush.h> #include <asm/ptrace.h> -#include <asm/cputype.h> +#include <asm/localtimer.h> /* * as from 2.5, kernels no longer have an init_tasks structure @@ -164,7 +167,7 @@ int __cpuexit __cpu_disable(void) * Take this CPU offline. Once we clear this, we can't return, * and we must not schedule until we're ready to give up the cpu. */ - cpu_clear(cpu, cpu_online_map); + set_cpu_online(cpu, false); /* * OK - migrate IRQs away from this CPU @@ -275,9 +278,9 @@ asmlinkage void __cpuinit secondary_start_kernel(void) local_fiq_enable(); /* - * Setup local timer for this CPU. + * Setup the percpu timer for this CPU. */ - local_timer_setup(); + percpu_timer_setup(); calibrate_delay(); @@ -286,7 +289,7 @@ asmlinkage void __cpuinit secondary_start_kernel(void) /* * OK, now it's safe to let the boot CPU continue */ - cpu_set(cpu, cpu_online_map); + set_cpu_online(cpu, true); /* * OK, it's off to the idle thread for us @@ -384,10 +387,16 @@ void show_local_irqs(struct seq_file *p) seq_putc(p, '\n'); } +/* + * Timer (local or broadcast) support + */ +static DEFINE_PER_CPU(struct clock_event_device, percpu_clockevent); + static void ipi_timer(void) { + struct clock_event_device *evt = &__get_cpu_var(percpu_clockevent); irq_enter(); - local_timer_interrupt(); + evt->event_handler(evt); irq_exit(); } @@ -406,6 +415,42 @@ asmlinkage void __exception do_local_timer(struct pt_regs *regs) } #endif +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST +static void smp_timer_broadcast(const struct cpumask *mask) +{ + send_ipi_message(mask, IPI_TIMER); +} + +static void broadcast_timer_set_mode(enum clock_event_mode mode, + struct clock_event_device *evt) +{ +} + +static void local_timer_setup(struct clock_event_device *evt) +{ + evt->name = "dummy_timer"; + evt->features = CLOCK_EVT_FEAT_ONESHOT | + CLOCK_EVT_FEAT_PERIODIC | + CLOCK_EVT_FEAT_DUMMY; + evt->rating = 400; + evt->mult = 1; + evt->set_mode = broadcast_timer_set_mode; + evt->broadcast = smp_timer_broadcast; + + clockevents_register_device(evt); +} +#endif + +void __cpuinit percpu_timer_setup(void) +{ + unsigned int cpu = smp_processor_id(); + struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu); + + evt->cpumask = cpumask_of(cpu); + + local_timer_setup(evt); +} + static DEFINE_SPINLOCK(stop_lock); /* @@ -418,7 +463,7 @@ static void ipi_cpu_stop(unsigned int cpu) dump_stack(); spin_unlock(&stop_lock); - cpu_clear(cpu, cpu_online_map); + set_cpu_online(cpu, false); local_fiq_disable(); local_irq_disable(); @@ -502,11 +547,6 @@ void smp_send_reschedule(int cpu) send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE); } -void smp_timer_broadcast(const struct cpumask *mask) -{ - send_ipi_message(mask, IPI_TIMER); -} - void smp_send_stop(void) { cpumask_t mask = cpu_online_map; |