Commit 059e2320 authored by Marc Zyngier's avatar Marc Zyngier

irqchip/gic: Allow self-SGIs for SMP on UP configurations

On systems where a single CPU is present, the GIC may not support
having SGIs delivered to a target list. In that case, we use the
self-SGI mechanism to allow the interrupt to be delivered locally.
Tested-by: default avatarFabio Estevam <>
Signed-off-by: default avatarMarc Zyngier <>
parent 1e12c4a9
......@@ -769,6 +769,13 @@ static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
int cpu;
unsigned long flags, map = 0;
if (unlikely(nr_cpu_ids == 1)) {
/* Only one CPU? let's do a self-IPI... */
writel_relaxed(2 << 24 | irq,
gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
raw_spin_lock_irqsave(&irq_controller_lock, flags);
/* Convert our logical CPU mask into a physical one. */
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment