Commit 7dfc8199 authored by Yang Yingliang's avatar Yang Yingliang Committed by Greg Kroah-Hartman

irqchip/gic-v3-its: Don't bind LPI to unavailable NUMA node

commit c1797b11 upstream.

On a NUMA system, if an ITS is local to an offline node, the ITS driver may
pick an offline CPU to bind the LPI.  In this case, pick an online CPU (and
the first one will do).

But on some systems, binding an LPI to non-local node CPU may cause
deadlock (see Cavium erratum 23144).  In this case, just fail the activate
and return an error code.
Signed-off-by: default avatarYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Sumit Garg <sumit.garg@linaro.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20180622095254.5906-5-marc.zyngier@arm.comSigned-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 88c4318d
......@@ -2221,7 +2221,14 @@ static void its_irq_domain_activate(struct irq_domain *domain,
cpu_mask = cpumask_of_node(its_dev->its->numa_node);
/* Bind the LPI to the first possible CPU */
cpu = cpumask_first(cpu_mask);
cpu = cpumask_first_and(cpu_mask, cpu_online_mask);
if (cpu >= nr_cpu_ids) {
if (its_dev->its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_23144)
return;
cpu = cpumask_first(cpu_online_mask);
}
its_dev->event_map.col_map[event] = cpu;
irq_data_update_effective_affinity(d, cpumask_of(cpu));
......
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