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

commit c1797b11a0 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: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Thomas 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.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Yang Yingliang 2018-06-22 10:52:51 +01:00 committed by Greg Kroah-Hartman
parent 88c4318d36
commit 7dfc81992a
1 changed files with 8 additions and 1 deletions
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9
drivers/irqchip/irq-gic-v3-its.c
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@ -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));