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 and return an error code on
failure. The vexpress TC2 (which has a single GIC) is currently the only
user of this function and so update it accordingly. Note that because the
TC2 only has a single GIC, the call to gic_cpu_if_down() should always
be successful.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: <linux-arm-kernel@lists.infradead.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Jason Cooper <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/1438332252-25248-2-git-send-email-jonathanh@nvidia.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 12 insertions, 6 deletions

diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 84fc622d0309..aa3e7b8a69c4 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -356,9 +356,9 @@ 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 *cpu_base = gic_data_cpu_base(gic);
 	u32 bypass = 0;
 
 	/*
@@ -426,17 +426,23 @@ static void gic_cpu_init(struct gic_chip_data *gic)
 	gic_cpu_config(dist_base, NULL);
 
 	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)
+int gic_cpu_if_down(unsigned int gic_nr)
 {
-	void __iomem *cpu_base = gic_data_cpu_base(&gic_data[0]);
+	void __iomem *cpu_base;
 	u32 val = 0;
 
+	if (gic_nr >= MAX_GIC_NR)
+		return -EINVAL;
+
+	cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
 	val = readl(cpu_base + GIC_CPU_CTRL);
 	val &= ~GICC_ENABLE;
 	writel_relaxed(val, cpu_base + GIC_CPU_CTRL);
+
+	return 0;
 }
 
 #ifdef CONFIG_CPU_PM
@@ -572,7 +578,7 @@ static void gic_cpu_restore(unsigned int gic_nr)
 					dist_base + GIC_DIST_PRI + i * 4);
 
 	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)