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| author | Paul Burton <paul.burton@imgtec.com> | 2014-02-14 09:24:58 +0000 |
|---|---|---|
| committer | Paul Burton <paul.burton@imgtec.com> | 2014-05-02 16:39:12 +0100 |
| commit | cc7964af8f997a20240d3ec5bf90c4fd20d3c48a (patch) | |
| tree | b948efef5c1f7365db870ffe12a1480149602900 /arch/mips/kernel | |
| parent | 60bdb9c7bd9ab5b63ad68e9391056f8757b810f1 (diff) | |
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 12ad10004645 "clockevents: Add generic timer broadcast function".
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Diffstat (limited to 'arch/mips/kernel')
| -rw-r--r-- | arch/mips/kernel/smp.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c index 0a022ee33b2a..9a5226443bc1 100644 --- a/arch/mips/kernel/smp.c +++ b/arch/mips/kernel/smp.c @@ -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 */ |