From 18416e45b76189daf37ba53b2bd0b9ac3749e92e Mon Sep 17 00:00:00 2001
From: Marc Zyngier <marc.zyngier@arm.com>
Date: Fri, 18 Aug 2017 09:39:24 +0100
Subject: [PATCH] irqchip/mips-gic: Report that effective affinity is a single
 target

The MIPS GIC driver only targets a single CPU at a time, even if
the notional affinity is wider. Let's inform the core code
about this.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Wei Xu <xuwei5@hisilicon.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Gregory Clement <gregory.clement@free-electrons.com>
Cc: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Link: http://lkml.kernel.org/r/20170818083925.10108-12-marc.zyngier@arm.com
---
 drivers/irqchip/Kconfig        |  1 +
 drivers/irqchip/irq-mips-gic.c | 10 +++++++---
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 39bfa5b25b54..bca9a88012f0 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -141,6 +141,7 @@ config IRQ_MIPS_CPU
 	select GENERIC_IRQ_IPI if SYS_SUPPORTS_MULTITHREADING
 	select IRQ_DOMAIN
 	select IRQ_DOMAIN_HIERARCHY if GENERIC_IRQ_IPI
+	select GENERIC_IRQ_EFFECTIVE_AFF_MASK
 
 config CLPS711X_IRQCHIP
 	bool
diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index 6ab1d3afec02..6461380ff1a4 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -445,24 +445,27 @@ static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
 	unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
 	cpumask_t	tmp = CPU_MASK_NONE;
 	unsigned long	flags;
-	int		i;
+	int		i, cpu;
 
 	cpumask_and(&tmp, cpumask, cpu_online_mask);
 	if (cpumask_empty(&tmp))
 		return -EINVAL;
 
+	cpu = cpumask_first(&tmp);
+
 	/* Assumption : cpumask refers to a single CPU */
 	spin_lock_irqsave(&gic_lock, flags);
 
 	/* Re-route this IRQ */
-	gic_map_to_vpe(irq, mips_cm_vp_id(cpumask_first(&tmp)));
+	gic_map_to_vpe(irq, mips_cm_vp_id(cpu));
 
 	/* Update the pcpu_masks */
 	for (i = 0; i < min(gic_vpes, NR_CPUS); i++)
 		clear_bit(irq, pcpu_masks[i].pcpu_mask);
-	set_bit(irq, pcpu_masks[cpumask_first(&tmp)].pcpu_mask);
+	set_bit(irq, pcpu_masks[cpu].pcpu_mask);
 
 	cpumask_copy(irq_data_get_affinity_mask(d), cpumask);
+	irq_data_update_effective_affinity(d, cpumask_of(cpu));
 	spin_unlock_irqrestore(&gic_lock, flags);
 
 	return IRQ_SET_MASK_OK_NOCOPY;
@@ -716,6 +719,7 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq,
 		if (err)
 			return err;
 
+		irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq)));
 		return gic_shared_irq_domain_map(d, virq, hwirq, 0);
 	}