[PATCH 3/7] genirq/debugfs: Allow irq domain name to be overriden

From: Marc Zyngier
Date: Tue Apr 24 2018 - 10:38:40 EST


As for irqchip, it would be useful for a domain to generate its
name dynamically, and thus control the name that gets used in
debugfs.

Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
---
include/linux/irqdomain.h | 1 +
kernel/irq/irqdomain.c | 14 ++++++++++++++
2 files changed, 15 insertions(+)

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 48c7e86bb556..a912b1cc1715 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -119,6 +119,7 @@ struct irq_domain_ops {
unsigned long *out_hwirq, unsigned int *out_type);
#endif
#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
+ char *(*override_name)(struct irq_domain *d);
void (*debug_show)(struct seq_file *m, struct irq_domain *d,
struct irq_data *irqd, int ind);
#endif
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 5d9fc01b60a6..521065c8bace 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -220,6 +220,20 @@ struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
domain->revmap_direct_max_irq = direct_max;
irq_domain_check_hierarchy(domain);

+#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
+ if (domain->ops->override_name) {
+ char *new_name;
+
+ new_name = domain->ops->override_name(domain);
+ if (new_name) {
+ if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
+ kfree(domain->name);
+ domain->name = new_name;
+ domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
+ }
+ }
+#endif
+
mutex_lock(&irq_domain_mutex);
debugfs_add_domain_dir(domain);
list_add(&domain->link, &irq_domain_list);
--
2.14.2