linux-kernel - [PATCH 3/4] irqchip/sifive-plic: Separate irq

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Date:   Sat, 16 May 2020 12:09:00 +0530
From:   Anup Patel <anup.patel@....com>
To:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>
Cc:     Atish Patra <atish.patra@....com>,
        Alistair Francis <Alistair.Francis@....com>,
        Anup Patel <anup@...infault.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Anup Patel <anup.patel@....com>
Subject: [PATCH 3/4] irqchip/sifive-plic: Separate irq_chip for muiltiple PLIC instances

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.patel@....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