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| author | Marc Zyngier <marc.zyngier@arm.com> | 2015-10-02 14:38:55 +0100 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2015-10-16 13:07:15 +0100 |
| commit | 82b9b4243c6d99d9e38087fa89183aa7479185e9 (patch) | |
| tree | abf24aebdcc73c8ef001e27aed472027ea7d4e9c | |
| parent | a251b263346e38b9fafebeb49ada9ce894882616 (diff) | |
| download | lwn-82b9b4243c6d99d9e38087fa89183aa7479185e9.tar.gz lwn-82b9b4243c6d99d9e38087fa89183aa7479185e9.zip | |
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: Rob Herring <robh@kernel.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
| -rw-r--r-- | drivers/of/irq.c | 18 | ||||
| -rw-r--r-- | include/linux/of_irq.h | 7 |
2 files changed, 25 insertions, 0 deletions
diff --git a/drivers/of/irq.c b/drivers/of/irq.c index ed64d98807f9..0baf626da56a 100644 --- a/drivers/of/irq.c +++ b/drivers/of/irq.c @@ -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 diff --git a/include/linux/of_irq.h b/include/linux/of_irq.h index 62ae6edecfd5..65d969246a4d 100644 --- a/include/linux/of_irq.h +++ b/include/linux/of_irq.h @@ -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) |