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Subject[PATCH v2 5/6] irq/domain: provide irq_domain_dispose_mappings() helper
Date
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Unmapping all interrupts before removing an irq_domain is a common
use-case. Provide an appropriate helper that can also be used with
the remove() callback in irq_domain ops.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
include/linux/irqdomain.h | 2 ++
kernel/irq/irqdomain.c | 17 +++++++++++++++++
2 files changed, 19 insertions(+)

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index fbc25f464f62..8fd27614dafd 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -390,6 +390,7 @@ extern unsigned int irq_create_mapping(struct irq_domain *host,
irq_hw_number_t hwirq);
extern unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec);
extern void irq_dispose_mapping(unsigned int virq);
+extern void irq_domain_dispose_mappings(struct irq_domain *domain);

/**
* irq_linear_revmap() - Find a linux irq from a hw irq number.
@@ -594,6 +595,7 @@ irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain)

#else /* CONFIG_IRQ_DOMAIN */
static inline void irq_dispose_mapping(unsigned int virq) { }
+static inline void irq_domain_dispose_mappings(struct irq_domain *domain) { }
static inline struct irq_domain *irq_find_matching_fwnode(
struct fwnode_handle *fwnode, enum irq_domain_bus_token bus_token)
{
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index b391d2e65bdd..d09de9f2411a 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -888,6 +888,23 @@ void irq_dispose_mapping(unsigned int virq)
}
EXPORT_SYMBOL_GPL(irq_dispose_mapping);

+/**
+ * irq_domain_dispose_mappings() - Unmap all interrupts
+ * @domain: domain for which to unmap all interrupts
+ */
+void irq_domain_dispose_mappings(struct irq_domain *domain)
+{
+ unsigned int virq;
+ int i;
+
+ for (i = 0; i < domain->hwirq_max; i++) {
+ virq = irq_find_mapping(domain, i);
+ if (virq)
+ irq_dispose_mapping(virq);
+ }
+}
+EXPORT_SYMBOL_GPL(irq_domain_dispose_mappings);
+
/**
* irq_find_mapping() - Find a linux irq from a hw irq number.
* @domain: domain owning this hardware interrupt
--
2.25.0
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