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-rw-r--r--arch/powerpc/kernel/irq.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 1339f32b44b..0e47c8cfc97 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -52,6 +52,7 @@
#include <linux/mutex.h>
#include <linux/bootmem.h>
#include <linux/pci.h>
+#include <linux/debugfs.h>
#include <asm/uaccess.h>
#include <asm/system.h>
@@ -1006,6 +1007,68 @@ static int irq_late_init(void)
}
arch_initcall(irq_late_init);
+#ifdef CONFIG_VIRQ_DEBUG
+static int virq_debug_show(struct seq_file *m, void *private)
+{
+ unsigned long flags;
+ irq_desc_t *desc;
+ const char *p;
+ char none[] = "none";
+ int i;
+
+ seq_printf(m, "%-5s %-7s %-15s %s\n", "virq", "hwirq",
+ "chip name", "host name");
+
+ for (i = 1; i < NR_IRQS; i++) {
+ desc = get_irq_desc(i);
+ spin_lock_irqsave(&desc->lock, flags);
+
+ if (desc->action && desc->action->handler) {
+ seq_printf(m, "%5d ", i);
+ seq_printf(m, "0x%05lx ", virq_to_hw(i));
+
+ if (desc->chip && desc->chip->typename)
+ p = desc->chip->typename;
+ else
+ p = none;
+ seq_printf(m, "%-15s ", p);
+
+ if (irq_map[i].host && irq_map[i].host->of_node)
+ p = irq_map[i].host->of_node->full_name;
+ else
+ p = none;
+ seq_printf(m, "%s\n", p);
+ }
+
+ spin_unlock_irqrestore(&desc->lock, flags);
+ }
+
+ return 0;
+}
+
+static int virq_debug_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, virq_debug_show, inode->i_private);
+}
+
+static const struct file_operations virq_debug_fops = {
+ .open = virq_debug_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init irq_debugfs_init(void)
+{
+ if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root,
+ NULL, &virq_debug_fops))
+ return -ENOMEM;
+
+ return 0;
+}
+__initcall(irq_debugfs_init);
+#endif /* CONFIG_VIRQ_DEBUG */
+
#endif /* CONFIG_PPC_MERGE */
#ifdef CONFIG_PPC64