@@ -689,6 +689,24 @@ static struct irq_domain *__of_get_msi_domain(struct device_node *np,
}
/**
+ * of_msi_map_get_device_domain - Use msi-map to find the relevant MSI domain
+ * @dev: device for which the mapping is to be done.
+ * @rid: Requester ID for the device.
+ *
+ * Walk up the device hierarchy looking for devices with a "msi-map"
+ * property.
+ *
+ * Returns: the MSI domain for this device (or NULL on failure)
+ */
+struct irq_domain *of_msi_map_get_device_domain(struct device *dev, u32 rid)
+{
+ struct device_node *np = NULL;
+
+ __of_msi_map_rid(dev, &np, rid);
+ return __of_get_msi_domain(np, DOMAIN_BUS_PCI_MSI);
+}
+
+/**
* of_msi_get_domain - Use msi-parent to find the relevant MSI domain
* @dev: device for which the domain is requested
* @np: device node for @dev
@@ -49,6 +49,8 @@ extern int of_irq_to_resource_table(struct device_node *dev,
extern struct irq_domain *of_msi_get_domain(struct device *dev,
struct device_node *np,
enum irq_domain_bus_token token);
+extern struct irq_domain *of_msi_map_get_device_domain(struct device *dev,
+ u32 rid);
#else
static inline int of_irq_count(struct device_node *dev)
{
@@ -73,6 +75,11 @@ static inline struct irq_domain *of_msi_get_domain(struct device *dev,
{
return NULL;
}
+static inline struct irq_domain *of_msi_map_get_device_domain(struct device *dev,
+ u32 rid)
+{
+ return NULL;
+}
#endif
#if defined(CONFIG_OF)
While msi-parent is used to point to the MSI controller that works for all the devices behind a root complex, it doesn't allow configurations where each individual device can be routed to a separate MSI controller. The msi-map property provides this flexibility (and much more), so let's add a utility function that parses it, and return the corresponding MSI domain. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> --- drivers/of/irq.c | 18 ++++++++++++++++++ include/linux/of_irq.h | 7 +++++++ 2 files changed, 25 insertions(+)