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MIPS: support for generic clockevents broadcast

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This patch adds support for generic clockevents broadcast using the a
dummy clockevent device and the tick_broadcast function introduced by
commit 12ad100046 "clockevents: Add generic timer broadcast function".

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
This commit is contained in:
Paul Burton 2014-02-14 09:24:58 +00:00
parent 60bdb9c7bd
commit cc7964af8f
2 changed files with 44 additions and 0 deletions
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1
arch/mips/Kconfig
View File

@ -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"

43
arch/mips/kernel/smp.c
View File

@ -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 */