[PATCH 3/4] irqchip/sifive-plic: Separate irq_chip for muiltiple PLIC instances

[Anup Patel]

To distinguish interrupts from multiple PLIC instances, we use a
per-PLIC irq_chip instance with a different name.

Signed-off-by: Anup Patel <anup.pa...@wdc.com>
---
 drivers/irqchip/irq-sifive-plic.c | 28 +++++++++++++++-------------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/drivers/irqchip/irq-sifive-plic.c 
b/drivers/irqchip/irq-sifive-plic.c
index 2d3db927a551..e42fc082ad18 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -60,6 +60,7 @@
 #define        PLIC_ENABLE_THRESHOLD           0
 
 struct plic_priv {
+       struct irq_chip chip;
        struct cpumask lmask;
        struct irq_domain *irqdomain;
        void __iomem *regs;
@@ -76,6 +77,7 @@ struct plic_handler {
        void __iomem            *enable_base;
        struct plic_priv        *priv;
 };
+static unsigned int plic_count;
 static bool plic_cpuhp_setup_done;
 static DEFINE_PER_CPU(struct plic_handler, plic_handlers);
 
@@ -164,20 +166,12 @@ static void plic_irq_eoi(struct irq_data *d)
        writel(d->hwirq, handler->hart_base + CONTEXT_CLAIM);
 }
 
-static struct irq_chip plic_chip = {
-       .name           = "SiFive PLIC",
-       .irq_mask       = plic_irq_mask,
-       .irq_unmask     = plic_irq_unmask,
-       .irq_eoi        = plic_irq_eoi,
-#ifdef CONFIG_SMP
-       .irq_set_affinity = plic_set_affinity,
-#endif
-};
-
 static int plic_irqdomain_map(struct irq_domain *d, unsigned int irq,
                              irq_hw_number_t hwirq)
 {
-       irq_domain_set_info(d, irq, hwirq, &plic_chip, d->host_data,
+       struct plic_priv *priv = d->host_data;
+
+       irq_domain_set_info(d, irq, hwirq, &priv->chip, d->host_data,
                            handle_fasteoi_irq, NULL, NULL);
        irq_set_noprobe(irq);
        return 0;
@@ -294,6 +288,14 @@ static int __init plic_init(struct device_node *node,
        if (!priv)
                return -ENOMEM;
 
+       priv->chip.name = kasprintf(GFP_KERNEL, "PLIC%d", plic_count++);
+       priv->chip.irq_mask = plic_irq_mask,
+       priv->chip.irq_unmask = plic_irq_unmask,
+       priv->chip.irq_eoi = plic_irq_eoi,
+#ifdef CONFIG_SMP
+       priv->chip.irq_set_affinity = plic_set_affinity,
+#endif
+
        priv->regs = of_iomap(node, 0);
        if (WARN_ON(!priv->regs)) {
                error = -EIO;
@@ -383,9 +385,9 @@ static int __init plic_init(struct device_node *node,
        }
 
        pr_info("interrupt-controller at 0x%llx "
-               "(interrupts=%d, contexts=%d, handlers=%d)\n",
+               "(interrupts=%d, contexts=%d, handlers=%d) (%s)\n",
                (unsigned long long)iores.start, nr_irqs,
-               nr_contexts, nr_handlers);
+               nr_contexts, nr_handlers, priv->chip.name);
        set_handle_irq(plic_handle_irq);
        return 0;
 
-- 
2.25.1