[v5,4/5] irqchip: sifive-plic: Differentiate between PLIC handler and context

Commit Message

Anup Patel Jan. 19, 2019, 5:56 a.m. UTC

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 <[e-mail]>
---
 drivers/irqchip/irq-sifive-plic.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

Comments

Christoph Hellwig Feb. 12, 2019, 7:09 a.m. UTC | #1

Looks fine,

Reviewed-by: Christoph Hellwig <[e-mail]>

Patch

diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index b9a0bcefe426..24c906f4be93 100644
--- 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;
@@ -245,11 +245,11 @@  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;