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>
}
static int
-cpld_pic_host_match(struct irq_domain *h, struct device_node *node)
+cpld_pic_host_match(struct irq_domain *h, struct device_node *node,
+ enum irq_domain_bus_token bus_token)
{
return cpld_pic_node == node;
}
#endif /* CONFIG_SMP */
-static int iic_host_match(struct irq_domain *h, struct device_node *node)
+static int iic_host_match(struct irq_domain *h, struct device_node *node,
+ enum irq_domain_bus_token bus_token)
{
return of_device_is_compatible(node,
"IBM,CBEA-Internal-Interrupt-Controller");
return 0;
}
-static int flipper_pic_match(struct irq_domain *h, struct device_node *np)
+static int flipper_pic_match(struct irq_domain *h, struct device_node *np,
+ enum irq_domain_bus_token bus_token)
{
return 1;
}
.name = "cascade",
};
-static int pmac_pic_host_match(struct irq_domain *h, struct device_node *node)
+static int pmac_pic_host_match(struct irq_domain *h, struct device_node *node,
+ enum irq_domain_bus_token bus_token)
{
/* We match all, we don't always have a node anyway */
return 1;
opal_handle_events(be64_to_cpu(last_outstanding_events));
}
-static int opal_event_match(struct irq_domain *h, struct device_node *node)
+static int opal_event_match(struct irq_domain *h, struct device_node *node,
+ enum irq_domain_bus_token bus_token)
{
return h->of_node == node;
}
return 0;
}
-static int ps3_host_match(struct irq_domain *h, struct device_node *np)
+static int ps3_host_match(struct irq_domain *h, struct device_node *np,
+ enum irq_domain_bus_token bus_token)
{
/* Match all */
return 1;
return irq_linear_revmap(global_ehv_pic->irqhost, irq);
}
-static int ehv_pic_host_match(struct irq_domain *h, struct device_node *node)
+static int ehv_pic_host_match(struct irq_domain *h, struct device_node *node,
+ enum irq_domain_bus_token bus_token)
{
/* Exact match, unless ehv_pic node is NULL */
return h->of_node == NULL || h->of_node == node;
.flags = IORESOURCE_BUSY,
};
-static int i8259_host_match(struct irq_domain *h, struct device_node *node)
+static int i8259_host_match(struct irq_domain *h, struct device_node *node,
+ enum irq_domain_bus_token bus_token)
{
return h->of_node == NULL || h->of_node == node;
}
.irq_set_type = ipic_set_irq_type,
};
-static int ipic_host_match(struct irq_domain *h, struct device_node *node)
+static int ipic_host_match(struct irq_domain *h, struct device_node *node,
+ enum irq_domain_bus_token bus_token)
{
/* Exact match, unless ipic node is NULL */
return h->of_node == NULL || h->of_node == node;
#endif /* CONFIG_MPIC_U3_HT_IRQS */
-static int mpic_host_match(struct irq_domain *h, struct device_node *node)
+static int mpic_host_match(struct irq_domain *h, struct device_node *node,
+ enum irq_domain_bus_token bus_token)
{
/* Exact match, unless mpic node is NULL */
return h->of_node == NULL || h->of_node == node;
.irq_mask_ack = qe_ic_mask_irq,
};
-static int qe_ic_host_match(struct irq_domain *h, struct device_node *node)
+static int qe_ic_host_match(struct irq_domain *h, struct device_node *node,
+ enum irq_domain_bus_token bus_token)
{
/* Exact match, unless qe_ic node is NULL */
return h->of_node == NULL || h->of_node == node;
}
#endif /* CONFIG_SMP */
-static int xics_host_match(struct irq_domain *h, struct device_node *node)
+static int xics_host_match(struct irq_domain *h, struct device_node *node,
+ enum irq_domain_bus_token bus_token)
{
struct ics *ics;
/* 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
* 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,
/* 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;
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.
EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
/**
- * irq_find_host() - Locates a domain for a given device node
+ * irq_find_matching_host() - Locates a domain for a given device node
* @node: device-tree node of the interrupt controller
+ * @bus_token: domain-specific data
*/
-struct irq_domain *irq_find_host(struct device_node *node)
+struct irq_domain *irq_find_matching_host(struct device_node *node,
+ enum irq_domain_bus_token bus_token)
{
struct irq_domain *h, *found = NULL;
int rc;
* it might potentially be set to match all interrupts in
* the absence of a device node. This isn't a problem so far
* yet though...
+ *
+ * bus_token == DOMAIN_BUS_ANY matches any domain, any other
+ * values must generate an exact match for the domain to be
+ * selected.
*/
mutex_lock(&irq_domain_mutex);
list_for_each_entry(h, &irq_domain_list, link) {
if (h->ops->match)
- rc = h->ops->match(h, node);
+ rc = h->ops->match(h, node, bus_token);
else
- rc = (h->of_node != NULL) && (h->of_node == node);
+ rc = ((h->of_node != NULL) && (h->of_node == node) &&
+ ((bus_token == DOMAIN_BUS_ANY) ||
+ (h->bus_token == bus_token)));
if (rc) {
found = h;
mutex_unlock(&irq_domain_mutex);
return found;
}
-EXPORT_SYMBOL_GPL(irq_find_host);
+EXPORT_SYMBOL_GPL(irq_find_matching_host);
/**
* irq_set_default_host() - Set a "default" irq domain
projects / linux-platform-drivers-x86.git / commitdiff