linux-kernel - [PATCH 03/12] irqchip/gic: Report that effective affinity is a single target

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Date:   Tue, 15 Aug 2017 12:34:38 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Wei Xu <xuwei5@...ilicon.com>,
        James Hogan <james.hogan@...tec.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...e-electrons.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Kevin Cernekee <cernekee@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        Paul Burton <paul.burton@...tec.com>,
        Matt Redfearn <matt.redfearn@...tec.com>
Subject: [PATCH 03/12] irqchip/gic: Report that effective affinity is a single target

The 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@....com>
---
 drivers/irqchip/Kconfig   | 1 +
 drivers/irqchip/irq-gic.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index f1fd5f44d1d4..586929d072ca 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -7,6 +7,7 @@ config ARM_GIC
 	select IRQ_DOMAIN
 	select IRQ_DOMAIN_HIERARCHY
 	select MULTI_IRQ_HANDLER
+	select GENERIC_IRQ_EFFECTIVE_AFF_MASK
 
 config ARM_GIC_PM
 	bool
diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 1b1df4f770bd..20dd2ba3d603 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -344,6 +344,8 @@ static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
 	writel_relaxed(val | bit, reg);
 	gic_unlock_irqrestore(flags);
 
+	irq_data_update_effective_affinity(d, cpumask_of(cpu));
+
 	return IRQ_SET_MASK_OK_DONE;
 }
 #endif
@@ -966,6 +968,7 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
 		irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
 				    handle_fasteoi_irq, NULL, NULL);
 		irq_set_probe(irq);
+		irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(irq)));
 	}
 	return 0;
 }
-- 
2.11.0