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From 374877efe7946546c4fa975bdff5b912d569daad Mon Sep 17 00:00:00 2001
From: Michael Zoran <mzoran@crowfest.net>
Date: Sat, 14 Jan 2017 21:43:57 -0800
Subject: [PATCH] ARM64: Round-Robin dispatch IRQs between CPUs.
IRQ-CPU mapping is round robined on ARM64 to increase
concurrency and allow multiple interrupts to be serviced
at a time. This reduces the need for FIQ.
Signed-off-by: Michael Zoran <mzoran@crowfest.net>
---
drivers/irqchip/irq-bcm2835.c | 15 ++++++++++++++-
drivers/irqchip/irq-bcm2836.c | 21 +++++++++++++++++++++
2 files changed, 35 insertions(+), 1 deletion(-)
--- a/drivers/irqchip/irq-bcm2835.c
+++ b/drivers/irqchip/irq-bcm2835.c
@@ -154,10 +154,23 @@ static void armctrl_unmask_irq(struct ir
}
}
+#ifdef CONFIG_ARM64
+void bcm2836_arm_irqchip_spin_gpu_irq(void);
+
+static void armctrl_ack_irq(struct irq_data *d)
+{
+ bcm2836_arm_irqchip_spin_gpu_irq();
+}
+
+#endif
+
static struct irq_chip armctrl_chip = {
.name = "ARMCTRL-level",
.irq_mask = armctrl_mask_irq,
- .irq_unmask = armctrl_unmask_irq
+ .irq_unmask = armctrl_unmask_irq,
+#ifdef CONFIG_ARM64
+ .irq_ack = armctrl_ack_irq
+#endif
};
static int armctrl_xlate(struct irq_domain *d, struct device_node *ctrlr,
--- a/drivers/irqchip/irq-bcm2836.c
+++ b/drivers/irqchip/irq-bcm2836.c
@@ -87,6 +87,27 @@ static void bcm2836_arm_irqchip_unmask_g
{
}
+#ifdef CONFIG_ARM64
+
+void bcm2836_arm_irqchip_spin_gpu_irq(void)
+{
+ u32 i;
+ void __iomem *gpurouting = (intc.base + LOCAL_GPU_ROUTING);
+ u32 routing_val = readl(gpurouting);
+
+ for (i = 1; i <= 3; i++) {
+ u32 new_routing_val = (routing_val + i) & 3;
+
+ if (cpu_active(new_routing_val)) {
+ writel(new_routing_val, gpurouting);
+ return;
+ }
+ }
+}
+EXPORT_SYMBOL(bcm2836_arm_irqchip_spin_gpu_irq);
+
+#endif
+
static struct irq_chip bcm2836_arm_irqchip_gpu = {
.name = "bcm2836-gpu",
.irq_mask = bcm2836_arm_irqchip_mask_gpu_irq,
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