Skip to content
Permalink
Browse files

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>
  • Loading branch information...
Electron752 authored and popcornmix committed Jan 15, 2017
1 parent 1c3155c commit 72e34f274a63a516f0b7ea5e164f30cdc8b62324
Showing with 35 additions and 1 deletion.
  1. +14 −1 drivers/irqchip/irq-bcm2835.c
  2. +21 −0 drivers/irqchip/irq-bcm2836.c
@@ -168,10 +168,23 @@ static void armctrl_unmask_irq(struct irq_data *d)
}
}

#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,
@@ -145,6 +145,27 @@ static void bcm2836_arm_irqchip_unmask_gpu_irq(struct irq_data *d)
{
}

#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,

0 comments on commit 72e34f2

Please sign in to comment.
You can’t perform that action at this time.