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Commit cc7964af authored by Paul Burton's avatar Paul Burton
Browse files

MIPS: support for generic clockevents broadcast 



This patch adds support for generic clockevents broadcast using the a
dummy clockevent device and the tick_broadcast function introduced by
commit 12ad1000 "clockevents: Add generic timer broadcast function".

Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
parent 60bdb9c7

arch/mips/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -51,6 +51,7 @@ config MIPS 
	select HAVE_DEBUG_STACKOVERFLOW

	select HAVE_CC_STACKPROTECTOR

	select CPU_PM if CPU_IDLE

	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST



menu "Machine selection"

arch/mips/kernel/smp.c

+43 −0
Original line number Diff line number Diff line
@@ -404,3 +404,46 @@ void dump_send_ipi(void (*dump_ipi_callback)(void *)) 
}

EXPORT_SYMBOL(dump_send_ipi);

#endif



#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST



static DEFINE_PER_CPU(atomic_t, tick_broadcast_count);

static DEFINE_PER_CPU(struct call_single_data, tick_broadcast_csd);



void tick_broadcast(const struct cpumask *mask)

{

	atomic_t *count;

	struct call_single_data *csd;

	int cpu;



	for_each_cpu(cpu, mask) {

		count = &per_cpu(tick_broadcast_count, cpu);

		csd = &per_cpu(tick_broadcast_csd, cpu);



		if (atomic_inc_return(count) == 1)

			smp_call_function_single_async(cpu, csd);

	}

}



static void tick_broadcast_callee(void *info)

{

	int cpu = smp_processor_id();

	tick_receive_broadcast();

	atomic_set(&per_cpu(tick_broadcast_count, cpu), 0);

}



static int __init tick_broadcast_init(void)

{

	struct call_single_data *csd;

	int cpu;



	for (cpu = 0; cpu < NR_CPUS; cpu++) {

		csd = &per_cpu(tick_broadcast_csd, cpu);

		csd->func = tick_broadcast_callee;

	}



	return 0;

}

early_initcall(tick_broadcast_init);



#endif /* CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */