Commit cc7964af authored by Paul Burton's avatar Paul Burton

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
...@@ -51,6 +51,7 @@ config MIPS ...@@ -51,6 +51,7 @@ config MIPS
select HAVE_DEBUG_STACKOVERFLOW select HAVE_DEBUG_STACKOVERFLOW
select HAVE_CC_STACKPROTECTOR select HAVE_CC_STACKPROTECTOR
select CPU_PM if CPU_IDLE select CPU_PM if CPU_IDLE
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
menu "Machine selection" menu "Machine selection"
......
...@@ -404,3 +404,46 @@ void dump_send_ipi(void (*dump_ipi_callback)(void *)) ...@@ -404,3 +404,46 @@ void dump_send_ipi(void (*dump_ipi_callback)(void *))
} }
EXPORT_SYMBOL(dump_send_ipi); EXPORT_SYMBOL(dump_send_ipi);
#endif #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 */
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