linux-kernel - [PATCH 2/2] irqchip/gic: Ensure gic_cpu_if_up/down() programs correct GIC instance

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Message-ID: <1438273573-27958-2-git-send-email-jonathanh@nvidia.com>
Date:	Thu, 30 Jul 2015 17:26:13 +0100
From:	Jon Hunter <jonathanh@...dia.com>
To:	Marc Zyngier <marc.zyngier@....com>,
	Russell King <linux@....linux.org.uk>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>
CC:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Jon Hunter <jonathanh@...dia.com>
Subject: [PATCH 2/2] irqchip/gic: Ensure gic_cpu_if_up/down() programs correct GIC instance

Commit 3228950621d9 ("irqchip: gic: Preserve gic V2 bypass bits in cpu
ctrl register") added a new function, gic_cpu_if_up(), to program the
GIC CPU_CTRL register. This function assumes that there is only one GIC
instance present and hence always uses the chip data for the primary GIC
controller. Although it is not common for there to be a secondary, some
devices do support a secondary. Therefore, fix this by passing
gic_cpu_if_up() a pointer to the appropriate chip data structure.

Similarly, the function gic_cpu_if_down() only assumes that there is a
single GIC instance present. Update this function so that an instance
number is passed for the appropriate GIC. The vexpress TC2 (which has
a single GIC) is currently the only user of this function and so update
it accordingly.

Signed-off-by: Jon Hunter <jonathanh@...dia.com>
---
I was hoping to make the gic_cpu_if_up/down function more symmetric as we
discussed but it is not possible to pass the gic_nr to gic_cpu_if_up()
from all the places called without making more changes. However, given
that gic_cpu_if_up() is a local function and gic_cpu_if_down() is public,
may be it does not matter too much.

 arch/arm/mach-vexpress/tc2_pm.c |  2 +-
 drivers/irqchip/irq-gic.c       | 14 +++++++-------
 include/linux/irqchip/arm-gic.h |  2 +-
 3 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/arch/arm/mach-vexpress/tc2_pm.c b/arch/arm/mach-vexpress/tc2_pm.c
index b3328cd46c33..1aa4ccece69f 100644
--- a/arch/arm/mach-vexpress/tc2_pm.c
+++ b/arch/arm/mach-vexpress/tc2_pm.c
@@ -80,7 +80,7 @@ static void tc2_pm_cpu_powerdown_prepare(unsigned int cpu, unsigned int cluster)
 	 * to the CPU by disabling the GIC CPU IF to prevent wfi
 	 * from completing execution behind power controller back
 	 */
-	gic_cpu_if_down();
+	gic_cpu_if_down(0);
 }
 
 static void tc2_pm_cluster_powerdown_prepare(unsigned int cluster)
diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 7566fe259d27..cf9aca22120f 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -356,10 +356,10 @@ static u8 gic_get_cpumask(struct gic_chip_data *gic)
 	return mask;
 }
 
-static void gic_cpu_if_up(void)
+static void gic_cpu_if_up(struct gic_chip_data *gic)
 {
-	void __iomem *cpu_base = gic_data_cpu_base(&gic_data[0]);
-	void __iomem *dist_base = gic_data_dist_base(&gic_data[0]);
+	void __iomem *cpu_base = gic_data_cpu_base(gic);
+	void __iomem *dist_base = gic_data_dist_base(gic);
 	u32 bypass = 0;
 
 	/*
@@ -451,12 +451,12 @@ static void gic_cpu_init(struct gic_chip_data *gic)
 	}
 
 	writel_relaxed(GICC_INT_PRI_THRESHOLD, base + GIC_CPU_PRIMASK);
-	gic_cpu_if_up();
+	gic_cpu_if_up(gic);
 }
 
-void gic_cpu_if_down(void)
+void gic_cpu_if_down(unsigned int gic_nr)
 {
-	void __iomem *cpu_base = gic_data_cpu_base(&gic_data[0]);
+	void __iomem *cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
 	u32 val = 0;
 
 	val = readl(cpu_base + GIC_CPU_CTRL);
@@ -608,7 +608,7 @@ static void gic_cpu_restore(unsigned int gic_nr)
 	}
 
 	writel_relaxed(GICC_INT_PRI_THRESHOLD, cpu_base + GIC_CPU_PRIMASK);
-	gic_cpu_if_up();
+	gic_cpu_if_up(&gic_data[gic_nr]);
 }
 
 static int gic_notifier(struct notifier_block *self, unsigned long cmd,	void *v)
diff --git a/include/linux/irqchip/arm-gic.h b/include/linux/irqchip/arm-gic.h
index f52a9024be9a..9728bf4ca31b 100644
--- a/include/linux/irqchip/arm-gic.h
+++ b/include/linux/irqchip/arm-gic.h
@@ -100,7 +100,7 @@ struct device_node;
 void gic_init_bases(unsigned int, int, void __iomem *, void __iomem *,
 		    u32 offset, struct device_node *);
 void gic_cascade_irq(unsigned int gic_nr, unsigned int irq);
-void gic_cpu_if_down(void);
+void gic_cpu_if_down(unsigned int gic_nr);
 
 static inline void gic_init(unsigned int nr, int start,
 			    void __iomem *dist , void __iomem *cpu)
-- 
2.1.4

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