linux-kernel - [PATCH 6/6] irqchip/mips-gic: Separate local interrupt handling.

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Date:   Fri, 5 Jan 2018 10:31:10 +0000
From:   Matt Redfearn <matt.redfearn@...s.com>
To:     Ralf Baechle <ralf@...ux-mips.org>,
        Thomas Gleixner <tglx@...utronix.de>
CC:     <linux-mips@...ux-mips.org>,
        Matt Redfearn <matt.redfearn@...s.com>,
        "Marc Zyngier" <marc.zyngier@....com>,
        Jason Cooper <jason@...edaemon.net>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 6/6] irqchip/mips-gic: Separate local interrupt handling.

The GIC driver now has the concept of multiple vectors for the shared
and local interrupts. The vector number for shared interrupt sources is
now in shared_cpu_pin and this effectively leaves gic_cpu_pin
containing the vector number for local interrupts. Rename it, and
additionally __gic_irq_dispatch to __gic_irq_dispatch_local, which is
only called for local interrupt sources now so no longer needs to handle
shared interrupts.

Signed-off-by: Matt Redfearn <matt.redfearn@...s.com>

---

 drivers/irqchip/irq-mips-gic.c | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index 541eae9a491d..b2cfc6d66d74 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -53,7 +53,7 @@ static struct irq_domain *gic_irq_domain;
 static struct irq_domain *gic_ipi_domain;
 static int gic_shared_intrs;
 static unsigned int shared_cpu_pin;
-static unsigned int gic_cpu_pin;
+static unsigned int local_cpu_pin;
 static unsigned int timer_cpu_pin;
 static struct irq_chip gic_level_irq_controller, gic_edge_irq_controller;
 static DECLARE_BITMAP(ipi_resrv, GIC_MAX_INTRS);
@@ -401,10 +401,9 @@ static struct irq_chip gic_all_vpes_local_irq_controller = {
 	.irq_cpu_online		= gic_all_vpes_irq_cpu_online,
 };
 
-static void __gic_irq_dispatch(void)
+static void __gic_irq_dispatch_local(void)
 {
 	gic_handle_local_int(false);
-	gic_handle_shared_int(false);
 }
 
 static void __gic_irq_dispatch_shared(void)
@@ -482,7 +481,7 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq,
 	}
 
 	intr = GIC_HWIRQ_TO_LOCAL(hwirq);
-	map = GIC_MAP_PIN_MAP_TO_PIN | gic_cpu_pin;
+	map = GIC_MAP_PIN_MAP_TO_PIN | local_cpu_pin;
 
 	switch (intr) {
 	case GIC_LOCAL_INT_TIMER:
@@ -735,18 +734,17 @@ static int __init gic_of_init(struct device_node *node,
 	mips_gic_enable_eic();
 
 	if (cpu_has_veic) {
-		/* Always use vector 1 in EIC mode */
-		gic_cpu_pin = 0;
-		timer_cpu_pin = gic_cpu_pin;
-		set_vi_handler(gic_cpu_pin + GIC_PIN_TO_VEC_OFFSET,
-			       __gic_irq_dispatch);
+		/* Route all local interrupts to pin 0, vector 1 */
+		timer_cpu_pin = local_cpu_pin = 0;
+		set_vi_handler(local_cpu_pin + GIC_PIN_TO_VEC_OFFSET,
+			       __gic_irq_dispatch_local);
 
 		/* Route all shared interrupts to pin 1, vector 2 */
 		shared_cpu_pin = 1;
 		set_vi_handler(shared_cpu_pin + GIC_PIN_TO_VEC_OFFSET,
 			       __gic_irq_dispatch_shared);
 	} else {
-		shared_cpu_pin = gic_cpu_pin = cpu_vec - GIC_CPU_PIN_OFFSET;
+		shared_cpu_pin = local_cpu_pin = cpu_vec - GIC_CPU_PIN_OFFSET;
 		irq_set_chained_handler(MIPS_CPU_IRQ_BASE + cpu_vec,
 					gic_irq_dispatch);
 		/*
@@ -768,7 +766,7 @@ static int __init gic_of_init(struct device_node *node,
 						timer_cpu_pin,
 						gic_irq_dispatch);
 		} else {
-			timer_cpu_pin = gic_cpu_pin;
+			timer_cpu_pin = local_cpu_pin;
 		}
 	}
 
-- 
2.7.4