=== Debugging ===
-If you switch on CONFIG_IRQ_DOMAIN_DEBUG (which depends on
-CONFIG_IRQ_DOMAIN and CONFIG_DEBUG_FS), you will find a new file in
-your debugfs mount point, called irq_domain_mapping. This file
-contains a live snapshot of all the IRQ domains in the system:
-
- name mapped linear-max direct-max devtree-node
- pl061 8 8 0 /smb/gpio@e0080000
- pl061 8 8 0 /smb/gpio@e1050000
- pMSI 0 0 0 /interrupt-controller@e1101000/v2m@e0080000
- MSI 37 0 0 /interrupt-controller@e1101000/v2m@e0080000
- GICv2m 37 0 0 /interrupt-controller@e1101000/v2m@e0080000
- GICv2 448 448 0 /interrupt-controller@e1101000
-
-it also iterates over the interrupts to display their mapping in the
-domains, and makes the domain stacking visible:
-
-
-irq hwirq chip name chip data active type domain
- 1 0x00019 GICv2 0xffff00000916bfd8 * LINEAR GICv2
- 2 0x0001d GICv2 0xffff00000916bfd8 LINEAR GICv2
- 3 0x0001e GICv2 0xffff00000916bfd8 * LINEAR GICv2
- 4 0x0001b GICv2 0xffff00000916bfd8 * LINEAR GICv2
- 5 0x0001a GICv2 0xffff00000916bfd8 LINEAR GICv2
-[...]
- 96 0x81808 MSI 0x (null) RADIX MSI
- 96+ 0x00063 GICv2m 0xffff8003ee116980 RADIX GICv2m
- 96+ 0x00063 GICv2 0xffff00000916bfd8 LINEAR GICv2
- 97 0x08800 MSI 0x (null) * RADIX MSI
- 97+ 0x00064 GICv2m 0xffff8003ee116980 * RADIX GICv2m
- 97+ 0x00064 GICv2 0xffff00000916bfd8 * LINEAR GICv2
-
-Here, interrupts 1-5 are only using a single domain, while 96 and 97
-are build out of a stack of three domain, each level performing a
-particular function.
+Most of the internals of the IRQ subsystem are exposed in debugfs by
+turning CONFIG_GENERIC_IRQ_DEBUGFS on.
}
EXPORT_SYMBOL_GPL(irq_find_mapping);
-#ifdef CONFIG_IRQ_DOMAIN_DEBUG
-static void virq_debug_show_one(struct seq_file *m, struct irq_desc *desc)
-{
- struct irq_domain *domain;
- struct irq_data *data;
-
- domain = desc->irq_data.domain;
- data = &desc->irq_data;
-
- while (domain) {
- unsigned int irq = data->irq;
- unsigned long hwirq = data->hwirq;
- struct irq_chip *chip;
- bool direct;
-
- if (data == &desc->irq_data)
- seq_printf(m, "%5d ", irq);
- else
- seq_printf(m, "%5d+ ", irq);
- seq_printf(m, "0x%05lx ", hwirq);
-
- chip = irq_data_get_irq_chip(data);
- seq_printf(m, "%-15s ", (chip && chip->name) ? chip->name : "none");
-
- seq_printf(m, "0x%p ", irq_data_get_irq_chip_data(data));
-
- seq_printf(m, " %c ", (desc->action && desc->action->handler) ? '*' : ' ');
- direct = (irq == hwirq) && (irq < domain->revmap_direct_max_irq);
- seq_printf(m, "%6s%-8s ",
- (hwirq < domain->revmap_size) ? "LINEAR" : "RADIX",
- direct ? "(DIRECT)" : "");
- seq_printf(m, "%s\n", domain->name);
-#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
- domain = domain->parent;
- data = data->parent_data;
-#else
- domain = NULL;
-#endif
- }
-}
-
-static int virq_debug_show(struct seq_file *m, void *private)
-{
- unsigned long flags;
- struct irq_desc *desc;
- struct irq_domain *domain;
- struct radix_tree_iter iter;
- void __rcu **slot;
- int i;
-
- seq_printf(m, " %-16s %-6s %-10s %-10s %s\n",
- "name", "mapped", "linear-max", "direct-max", "devtree-node");
- mutex_lock(&irq_domain_mutex);
- list_for_each_entry(domain, &irq_domain_list, link) {
- struct device_node *of_node;
- const char *name;
-
- int count = 0;
-
- of_node = irq_domain_get_of_node(domain);
- if (of_node)
- name = of_node_full_name(of_node);
- else if (is_fwnode_irqchip(domain->fwnode))
- name = container_of(domain->fwnode, struct irqchip_fwid,
- fwnode)->name;
- else
- name = "";
-
- radix_tree_for_each_slot(slot, &domain->revmap_tree, &iter, 0)
- count++;
- seq_printf(m, "%c%-16s %6u %10u %10u %s\n",
- domain == irq_default_domain ? '*' : ' ', domain->name,
- domain->revmap_size + count, domain->revmap_size,
- domain->revmap_direct_max_irq,
- name);
- }
- mutex_unlock(&irq_domain_mutex);
-
- seq_printf(m, "%-5s %-7s %-15s %-*s %6s %-14s %s\n", "irq", "hwirq",
- "chip name", (int)(2 * sizeof(void *) + 2), "chip data",
- "active", "type", "domain");
-
- for (i = 1; i < nr_irqs; i++) {
- desc = irq_to_desc(i);
- if (!desc)
- continue;
-
- raw_spin_lock_irqsave(&desc->lock, flags);
- virq_debug_show_one(m, desc);
- raw_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("irq_domain_mapping", S_IRUGO, NULL,
- NULL, &virq_debug_fops) == NULL)
- return -ENOMEM;
-
- return 0;
-}
-__initcall(irq_debugfs_init);
-#endif /* CONFIG_IRQ_DOMAIN_DEBUG */
-
/**
* irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
*
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