irqchip/sifive-plic: Differentiate between PLIC handler and context

We explicitly differentiate between PLIC handler and context because
PLIC context is for given mode of HART whereas PLIC handler is per-CPU
software construct meant for handling interrupts from a particular
PLIC context.

To achieve this differentiation, we rename "nr_handlers" to "nr_contexts"
and "nr_mapped" to "nr_handlers" in plic_init().

Signed-off-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index b8721b4..c5cc7e1 100644 (file)
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -177,7 +177,7 @@ static int plic_find_hart_id(struct device_node *node)
 static int __init plic_init(struct device_node *node,
                struct device_node *parent)
 {
-       int error = 0, nr_handlers, nr_mapped = 0, i;
+       int error = 0, nr_contexts, nr_handlers = 0, i;
        u32 nr_irqs;
 
        if (plic_regs) {
@@ -194,10 +194,10 @@ static int __init plic_init(struct device_node *node,
        if (WARN_ON(!nr_irqs))
                goto out_iounmap;
 
-       nr_handlers = of_irq_count(node);
-       if (WARN_ON(!nr_handlers))
+       nr_contexts = of_irq_count(node);
+       if (WARN_ON(!nr_contexts))
                goto out_iounmap;
-       if (WARN_ON(nr_handlers < num_possible_cpus()))
+       if (WARN_ON(nr_contexts < num_possible_cpus()))
                goto out_iounmap;
 
        error = -ENOMEM;
@@ -206,7 +206,7 @@ static int __init plic_init(struct device_node *node,
        if (WARN_ON(!plic_irqdomain))
                goto out_iounmap;
 
-       for (i = 0; i < nr_handlers; i++) {
+       for (i = 0; i < nr_contexts; i++) {
                struct of_phandle_args parent;
                struct plic_handler *handler;
                irq_hw_number_t hwirq;
@@ -250,11 +250,11 @@ static int __init plic_init(struct device_node *node,
                writel(0, handler->hart_base + CONTEXT_THRESHOLD);
                for (hwirq = 1; hwirq <= nr_irqs; hwirq++)
                        plic_toggle(handler, hwirq, 0);
-               nr_mapped++;
+               nr_handlers++;
        }
 
-       pr_info("mapped %d interrupts to %d (out of %d) handlers.\n",
-               nr_irqs, nr_mapped, nr_handlers);
+       pr_info("mapped %d interrupts with %d handlers for %d contexts.\n",
+               nr_irqs, nr_handlers, nr_contexts);
        set_handle_irq(plic_handle_irq);
        return 0;