target/linux/brcm2708/patches-4.9/950-0131-ARM64-Round-Robin-dispatch-IRQs-between-CPUs.patch

   1 From 3a9b48156c6681e846d1a7dbe4ecbb3ae14c2f3c Mon Sep 17 00:00:00 2001
   2 From: Michael Zoran <mzoran@crowfest.net>
   3 Date: Sat, 14 Jan 2017 21:43:57 -0800
   4 Subject: [PATCH] ARM64: Round-Robin dispatch IRQs between CPUs.
   5
   6 IRQ-CPU mapping is round robined on ARM64 to increase
   7 concurrency and allow multiple interrupts to be serviced
   8 at a time.  This reduces the need for FIQ.
   9
  10 Signed-off-by: Michael Zoran <mzoran@crowfest.net>
  11 ---
  12  drivers/irqchip/irq-bcm2835.c | 15 ++++++++++++++-
  13  drivers/irqchip/irq-bcm2836.c | 21 +++++++++++++++++++++
  14  2 files changed, 35 insertions(+), 1 deletion(-)
  15
  16 --- a/drivers/irqchip/irq-bcm2835.c
  17 +++ b/drivers/irqchip/irq-bcm2835.c
  18 @@ -168,10 +168,23 @@ static void armctrl_unmask_irq(struct ir
  19         }
  20  }
  21
  22 +#ifdef CONFIG_ARM64
  23 +void bcm2836_arm_irqchip_spin_gpu_irq(void);
  24 +
  25 +static void armctrl_ack_irq(struct irq_data *d)
  26 +{
  27 +       bcm2836_arm_irqchip_spin_gpu_irq();
  28 +}
  29 +
  30 +#endif
  31 +
  32  static struct irq_chip armctrl_chip = {
  33         .name = "ARMCTRL-level",
  34         .irq_mask = armctrl_mask_irq,
  35 -       .irq_unmask = armctrl_unmask_irq
  36 +       .irq_unmask = armctrl_unmask_irq,
  37 +#ifdef CONFIG_ARM64
  38 +       .irq_ack    = armctrl_ack_irq
  39 +#endif
  40  };
  41
  42  static int armctrl_xlate(struct irq_domain *d, struct device_node *ctrlr,
  43 --- a/drivers/irqchip/irq-bcm2836.c
  44 +++ b/drivers/irqchip/irq-bcm2836.c
  45 @@ -145,6 +145,27 @@ static void bcm2836_arm_irqchip_unmask_g
  46  {
  47  }
  48
  49 +#ifdef CONFIG_ARM64
  50 +
  51 +void bcm2836_arm_irqchip_spin_gpu_irq(void)
  52 +{
  53 +       u32 i;
  54 +       void __iomem *gpurouting = (intc.base + LOCAL_GPU_ROUTING);
  55 +       u32 routing_val = readl(gpurouting);
  56 +
  57 +       for (i = 1; i <= 3; i++) {
  58 +               u32 new_routing_val = (routing_val + i) & 3;
  59 +
  60 +               if (cpu_active(new_routing_val)) {
  61 +                       writel(new_routing_val, gpurouting);
  62 +                       return;
  63 +               }
  64 +       }
  65 +}
  66 +EXPORT_SYMBOL(bcm2836_arm_irqchip_spin_gpu_irq);
  67 +
  68 +#endif
  69 +
  70  static struct irq_chip bcm2836_arm_irqchip_gpu = {
  71         .name           = "bcm2836-gpu",
  72         .irq_mask       = bcm2836_arm_irqchip_mask_gpu_irq,