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

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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: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2016-08-09 07:50:44 +01:00
parent 1e12c4a939
commit 059e232089
1 changed files with 7 additions and 0 deletions
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7
drivers/irqchip/irq-gic.c
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@ -769,6 +769,13 @@ static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
int cpu; int cpu;
unsigned long flags, map = 0; 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);
return;
}
raw_spin_lock_irqsave(&irq_controller_lock, flags); raw_spin_lock_irqsave(&irq_controller_lock, flags);
/* Convert our logical CPU mask into a physical one. */ /* Convert our logical CPU mask into a physical one. */