irqdomain: merge linear and tree reverse mappings.

Keeping them separate makes irq_domain more complex and adds a lot of
code (as proven by the diffstat).  Merging them simplifies the whole
scheme.  This change makes it so both the tree and linear methods can be
used by the same irq_domain instance.  If the hwirq is less than the
->linear_size, then the linear map is used to reverse map the hwirq.
Otherwise the radix tree is used.  The test for which map to use is no
more expensive that the existing code, so the performance of fast path
is preserved.

It also means that complex interrupt controllers can use both the
linear map and a tree in the same domain.  This may be useful for an
interrupt controller with a base set of core irqs and a large number
of GPIOs which might be used as irqs.  The linear map could cover the
core irqs, and the tree used for thas irqs.  The linear map could
cover the core irqs, and the tree used for the gpios.

v2: Drop reorganization of revmap data

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Rob Herring <rob.herring@calxeda.com>

1 files changed, 10 insertions, 8 deletions

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index e5e513c2d104..1cbb7413c121 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -75,7 +75,6 @@ struct irq_domain_chip_generic;
  * @link: Element in global irq_domain list.
  * @revmap_type: Method used for reverse mapping hwirq numbers to linux irq. This
  *               will be one of the IRQ_DOMAIN_MAP_* values.
- * @revmap_data: Revmap method specific data.
  * @ops: pointer to irq_domain methods
  * @host_data: private data pointer for use by owner.  Not touched by irq_domain
  *             core code.
@@ -93,10 +92,9 @@ struct irq_domain {
 
 	/* type of reverse mapping_technique */
 	unsigned int revmap_type;
-	union {
+	struct {
 		struct {
 			unsigned int size;
-			unsigned int *revmap;
 		} linear;
 		struct {
 			unsigned int max_irq;
@@ -111,11 +109,13 @@ struct irq_domain {
 	struct device_node *of_node;
 	/* Optional pointer to generic interrupt chips */
 	struct irq_domain_chip_generic *gc;
+
+	/* Linear reverse map */
+	unsigned int linear_revmap[];
 };
 
 #define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */
 #define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */
-#define IRQ_DOMAIN_MAP_TREE 3 /* radix tree */
 
 #ifdef CONFIG_IRQ_DOMAIN
 struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
@@ -137,10 +137,6 @@ struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
 					 unsigned int max_irq,
 					 const struct irq_domain_ops *ops,
 					 void *host_data);
-struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
-					 const struct irq_domain_ops *ops,
-					 void *host_data);
-
 extern struct irq_domain *irq_find_host(struct device_node *node);
 extern void irq_set_default_host(struct irq_domain *host);
 
@@ -152,6 +148,12 @@ static inline struct irq_domain *irq_domain_add_legacy_isa(
 	return irq_domain_add_legacy(of_node, NUM_ISA_INTERRUPTS, 0, 0, ops,
 				     host_data);
 }
+static inline struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
+					 const struct irq_domain_ops *ops,
+					 void *host_data)
+{
+	return irq_domain_add_linear(of_node, 0, ops, host_data);
+}
 
 extern void irq_domain_remove(struct irq_domain *host);