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

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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: Rob Herring <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
This commit is contained in:
Marc Zyngier 2015-10-02 14:38:55 +01:00
commit 82b9b4243c
2 changed files with 25 additions and 0 deletions
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18
drivers/of/irq.c
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@ -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