From 3a9f3c695a95d3c34a360e9a95bccce37806c952 Mon Sep 17 00:00:00 2001 From: Michael Zoran 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 --- 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 @@ -162,10 +162,23 @@ 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 @@ -95,6 +95,27 @@ 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,