irqdomain: Allow domain matching on irq_fwspec

When iterating over the irq domain list, we try to match a domain
either by calling a match() function or by comparing a number
of fields passed as parameters.

Both approaches are a bit restrictive:
- match() is DT specific and only takes a device node
- the fallback case only deals with the fwnode_handle

It would be useful if we had a per-domain function that would
actually perform the matching check on the whole of the
irq_fwspec structure. This would allow for a domain to triage
matching attempts that need to extend beyond the fwnode.

Let's introduce irq_find_matching_fwspec(), which takes a full
blown irq_fwspec structure, and call into a select() function
implemented by the irqdomain. irq_find_matching_fwnode() is
made a wrapper around irq_find_matching_fwspec in order to
preserve compatibility.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Rob Herring <robh+dt@kernel.org>
Link: http://lkml.kernel.org/r/1460365075-7316-2-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 24 insertions, 10 deletions

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 736abd74c135..f1f36e04d885 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -96,6 +96,8 @@ enum irq_domain_bus_token {
 struct irq_domain_ops {
         int (*match)(struct irq_domain *d, struct device_node *node,
                      enum irq_domain_bus_token bus_token);
+        int (*select)(struct irq_domain *d, struct irq_fwspec *fwspec,
+                      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,
@@ -211,7 +213,7 @@ 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_matching_fwnode(struct fwnode_handle *fwnode,
+extern struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
                                                    enum irq_domain_bus_token bus_token);
 extern void irq_set_default_host(struct irq_domain *host);
 extern int irq_domain_alloc_descs(int virq, unsigned int nr_irqs,
@@ -227,6 +229,17 @@ static inline bool is_fwnode_irqchip(struct fwnode_handle *fwnode)
         return fwnode && fwnode->type == FWNODE_IRQCHIP;
 }
 
+static inline
+struct irq_domain *irq_find_matching_fwnode(struct fwnode_handle *fwnode,
+                                            enum irq_domain_bus_token bus_token)
+{
+        struct irq_fwspec fwspec = {
+                .fwnode = fwnode,
+        };
+
+        return irq_find_matching_fwspec(&fwspec, bus_token);
+}
+
 static inline struct irq_domain *irq_find_matching_host(struct device_node *node,
                                                         enum irq_domain_bus_token bus_token)
 {
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 3a519a01118b..503c5b9dd030 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -243,14 +243,15 @@ struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
 EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
 
 /**
- * irq_find_matching_fwnode() - Locates a domain for a given fwnode
- * @fwnode: FW descriptor of the interrupt controller
+ * irq_find_matching_fwspec() - Locates a domain for a given fwspec
+ * @fwspec: FW specifier for an interrupt
  * @bus_token: domain-specific data
  */
-struct irq_domain *irq_find_matching_fwnode(struct fwnode_handle *fwnode,
+struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
                                             enum irq_domain_bus_token bus_token)
 {
         struct irq_domain *h, *found = NULL;
+        struct fwnode_handle *fwnode = fwspec->fwnode;
         int rc;
 
         /* We might want to match the legacy controller last since
@@ -264,7 +265,9 @@ struct irq_domain *irq_find_matching_fwnode(struct fwnode_handle *fwnode,
          */
         mutex_lock(&irq_domain_mutex);
         list_for_each_entry(h, &irq_domain_list, link) {
-                if (h->ops->match)
+                if (h->ops->select && fwspec->param_count)
+                        rc = h->ops->select(h, fwspec, bus_token);
+                else if (h->ops->match)
                         rc = h->ops->match(h, to_of_node(fwnode), bus_token);
                 else
                         rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
@@ -279,7 +282,7 @@ struct irq_domain *irq_find_matching_fwnode(struct fwnode_handle *fwnode,
         mutex_unlock(&irq_domain_mutex);
         return found;
 }
-EXPORT_SYMBOL_GPL(irq_find_matching_fwnode);
+EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
 
 /**
  * irq_set_default_host() - Set a "default" irq domain
@@ -574,11 +577,9 @@ unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
         int virq;
 
         if (fwspec->fwnode) {
-                domain = irq_find_matching_fwnode(fwspec->fwnode,
-                                                  DOMAIN_BUS_WIRED);
+                domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
                 if (!domain)
-                        domain = irq_find_matching_fwnode(fwspec->fwnode,
-                                                          DOMAIN_BUS_ANY);
+                        domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
         } else {
                 domain = irq_default_domain;
         }