Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 82b9b424 authored by Marc Zyngier's avatar Marc Zyngier
Browse files

of/irq: Use the msi-map property to provide device-specific MSI domain 



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.

Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent a251b263

drivers/of/irq.c

+18 −0
Original line number Diff line number Diff line
@@ -688,6 +688,24 @@ static struct irq_domain *__of_get_msi_domain(struct device_node *np, 
	return d;

}



/**

 * 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

include/linux/of_irq.h

+7 −0
Original line number Diff line number Diff line
@@ -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)