1 files changed, 82 insertions, 15 deletions

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 24bea97c736c..151b13119208 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>
@@ -272,7 +273,7 @@ void do_IRQ(struct pt_regs *regs)
         struct thread_info *curtp, *irqtp;
 #endif
 
-        irq_enter();
+        irq_enter();
 
 #ifdef CONFIG_DEBUG_STACKOVERFLOW
         /* Debugging check for stack overflow: is there less than 2KB free? */
@@ -321,7 +322,7 @@ void do_IRQ(struct pt_regs *regs)
                 /* That's not SMP safe ... but who cares ? */
                 ppc_spurious_interrupts++;
 
-        irq_exit();
+        irq_exit();
         set_irq_regs(old_regs);
 
 #ifdef CONFIG_PPC_ISERIES
@@ -418,10 +419,16 @@ irq_hw_number_t virq_to_hw(unsigned int virq)
 }
 EXPORT_SYMBOL_GPL(virq_to_hw);
 
-__init_refok struct irq_host *irq_alloc_host(unsigned int revmap_type,
-                                                unsigned int revmap_arg,
-                                                struct irq_host_ops *ops,
-                                                irq_hw_number_t inval_irq)
+static int default_irq_host_match(struct irq_host *h, struct device_node *np)
+{
+        return h->of_node != NULL && h->of_node == np;
+}
+
+struct irq_host *irq_alloc_host(struct device_node *of_node,
+                                unsigned int revmap_type,
+                                unsigned int revmap_arg,
+                                struct irq_host_ops *ops,
+                                irq_hw_number_t inval_irq)
 {
         struct irq_host *host;
         unsigned int size = sizeof(struct irq_host);
@@ -432,13 +439,7 @@ __init_refok struct irq_host *irq_alloc_host(unsigned int revmap_type,
         /* Allocate structure and revmap table if using linear mapping */
         if (revmap_type == IRQ_HOST_MAP_LINEAR)
                 size += revmap_arg * sizeof(unsigned int);
-        if (mem_init_done)
-                host = kzalloc(size, GFP_KERNEL);
-        else {
-                host = alloc_bootmem(size);
-                if (host)
-                        memset(host, 0, size);
-        }
+        host = zalloc_maybe_bootmem(size, GFP_KERNEL);
         if (host == NULL)
                 return NULL;
 
@@ -446,6 +447,10 @@ __init_refok struct irq_host *irq_alloc_host(unsigned int revmap_type,
         host->revmap_type = revmap_type;
         host->inval_irq = inval_irq;
         host->ops = ops;
+        host->of_node = of_node;
+
+        if (host->ops->match == NULL)
+                host->ops->match = default_irq_host_match;
 
         spin_lock_irqsave(&irq_big_lock, flags);
 
@@ -477,7 +482,7 @@ __init_refok struct irq_host *irq_alloc_host(unsigned int revmap_type,
                 host->inval_irq = 0;
                 /* setup us as the host for all legacy interrupts */
                 for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
-                        irq_map[i].hwirq = 0;
+                        irq_map[i].hwirq = i;
                         smp_wmb();
                         irq_map[i].host = host;
                         smp_wmb();
@@ -521,7 +526,7 @@ struct irq_host *irq_find_host(struct device_node *node)
          */
         spin_lock_irqsave(&irq_big_lock, flags);
         list_for_each_entry(h, &irq_hosts, link)
-                if (h->ops->match == NULL || h->ops->match(h, node)) {
+                if (h->ops->match(h, node)) {
                         found = h;
                         break;
                 }
@@ -996,6 +1001,68 @@ 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