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genirq/irqdomain: Allow irq domain aliasing

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It is not uncommon (at least with the ARM stuff) to have a piece
of hardware that implements different flavours of "interrupts".
A typical example of this is the GICv3 ITS, which implements
standard PCI/MSI support, but also some form of "generic MSI".

So far, the PCI/MSI domain is registered using the ITS device_node,
so that irq_find_host can return it. On the contrary, the raw MSI
domain is not registered with an device_node, making it impossible
to be looked up by another subsystem (obviously, using the same
device_node twice would only result in confusion, as it is not
defined which one irq_find_host would return).

A solution to this is to "type" domains that may be aliasing, and
to be able to lookup an device_node that matches a given type.
For this, we introduce irq_find_matching_host() as a superset
of irq_find_host:

struct irq_domain *irq_find_matching_host(struct device_node *node,
                                enum irq_domain_bus_token bus_token);

where bus_token is the "type" we want to match the domain against
(so far, only DOMAIN_BUS_ANY is defined). This result in some
moderately invasive changes on the PPC side (which is the only
user of the .match method).

This has otherwise no functionnal change.

Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: <linux-arm-kernel@lists.infradead.org>
Cc: Yijing Wang <wangyijing@huawei.com>
Cc: Ma Jun <majun258@huawei.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Duc Dang <dhdang@apm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/1438091186-10244-2-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Marc Zyngier 2015-07-28 14:46:08 +01:00 • committed by Thomas Gleixner
parent 8505a81bb0
commit ad3aedfbb0
14 changed files with 58 additions and 19 deletions
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23
include/linux/irqdomain.h
View file

@ -45,6 +45,17 @@ struct irq_data;
/* Number of irqs reserved for a legacy isa controller */
#define NUM_ISA_INTERRUPTS 16
/*
* Should several domains have the same device node, but serve
* different purposes (for example one domain is for PCI/MSI, and the
* other for wired IRQs), they can be distinguished using a
* bus-specific token. Most domains are expected to only carry
* DOMAIN_BUS_ANY.
*/
enum irq_domain_bus_token {
DOMAIN_BUS_ANY = 0,
};
/**
* struct irq_domain_ops - Methods for irq_domain objects
* @match: Match an interrupt controller device node to a host, returns
@ -61,7 +72,8 @@ struct irq_data;
* to setup the irq_desc when returning from map().
*/
struct irq_domain_ops {
int (*match)(struct irq_domain *d, struct device_node *node);
int (*match)(struct irq_domain *d, struct device_node *node,
enum irq_domain_bus_token bus_token);
int (*map)(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw);
void (*unmap)(struct irq_domain *d, unsigned int virq);
int (*xlate)(struct irq_domain *d, struct device_node *node,
@ -116,6 +128,7 @@ struct irq_domain {
/* Optional data */
struct device_node *of_node;
enum irq_domain_bus_token bus_token;
struct irq_domain_chip_generic *gc;
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
struct irq_domain *parent;
@ -161,9 +174,15 @@ struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
irq_hw_number_t first_hwirq,
const struct irq_domain_ops *ops,
void *host_data);
extern struct irq_domain *irq_find_host(struct device_node *node);
extern struct irq_domain *irq_find_matching_host(struct device_node *node,
enum irq_domain_bus_token bus_token);
extern void irq_set_default_host(struct irq_domain *host);
static inline struct irq_domain *irq_find_host(struct device_node *node)
{
return irq_find_matching_host(node, DOMAIN_BUS_ANY);
}
/**
* irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
* @of_node: pointer to interrupt controller's device tree node.