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, 29 insertions, 78 deletions

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index b1b5e6793fd2..5a1d8ec8509e 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -34,22 +34,24 @@ static struct irq_domain *irq_default_domain;
  * to IRQ domain, or NULL on failure.
  */
 static struct irq_domain *irq_domain_alloc(struct device_node *of_node,
-					   unsigned int revmap_type,
+					   unsigned int revmap_type, int size,
 					   const struct irq_domain_ops *ops,
 					   void *host_data)
 {
 	struct irq_domain *domain;
 
-	domain = kzalloc_node(sizeof(*domain), GFP_KERNEL,
-			      of_node_to_nid(of_node));
+	domain = kzalloc_node(sizeof(*domain) + (sizeof(unsigned int) * size),
+			      GFP_KERNEL, of_node_to_nid(of_node));
 	if (WARN_ON(!domain))
 		return NULL;
 
 	/* Fill structure */
+	INIT_RADIX_TREE(&domain->revmap_data.tree, GFP_KERNEL);
 	domain->revmap_type = revmap_type;
 	domain->ops = ops;
 	domain->host_data = host_data;
 	domain->of_node = of_node_get(of_node);
+	domain->revmap_data.linear.size = size;
 
 	return domain;
 }
@@ -81,22 +83,12 @@ void irq_domain_remove(struct irq_domain *domain)
 {
 	mutex_lock(&irq_domain_mutex);
 
-	switch (domain->revmap_type) {
-	case IRQ_DOMAIN_MAP_TREE:
-		/*
-		 * radix_tree_delete() takes care of destroying the root
-		 * node when all entries are removed. Shout if there are
-		 * any mappings left.
-		 */
-		WARN_ON(domain->revmap_data.tree.height);
-		break;
-	case IRQ_DOMAIN_MAP_LINEAR:
-		kfree(domain->revmap_data.linear.revmap);
-		domain->revmap_data.linear.size = 0;
-		break;
-	case IRQ_DOMAIN_MAP_NOMAP:
-		break;
-	}
+	/*
+	 * radix_tree_delete() takes care of destroying the root
+	 * node when all entries are removed. Shout if there are
+	 * any mappings left.
+	 */
+	WARN_ON(domain->revmap_data.tree.height);
 
 	list_del(&domain->link);
 
@@ -223,20 +215,11 @@ struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
 					 void *host_data)
 {
 	struct irq_domain *domain;
-	unsigned int *revmap;
 
-	revmap = kzalloc_node(sizeof(*revmap) * size, GFP_KERNEL,
-			      of_node_to_nid(of_node));
-	if (WARN_ON(!revmap))
+	domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LINEAR, size, ops, host_data);
+	if (!domain)
 		return NULL;
 
-	domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LINEAR, ops, host_data);
-	if (!domain) {
-		kfree(revmap);
-		return NULL;
-	}
-	domain->revmap_data.linear.size = size;
-	domain->revmap_data.linear.revmap = revmap;
 	irq_domain_add(domain);
 	return domain;
 }
@@ -248,7 +231,7 @@ struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
 					 void *host_data)
 {
 	struct irq_domain *domain = irq_domain_alloc(of_node,
-					IRQ_DOMAIN_MAP_NOMAP, ops, host_data);
+					IRQ_DOMAIN_MAP_NOMAP, 0, ops, host_data);
 	if (domain) {
 		domain->revmap_data.nomap.max_irq = max_irq ? max_irq : ~0;
 		irq_domain_add(domain);
@@ -258,28 +241,6 @@ struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
 EXPORT_SYMBOL_GPL(irq_domain_add_nomap);
 
 /**
- * irq_domain_add_tree()
- * @of_node: pointer to interrupt controller's device tree node.
- * @ops: map/unmap domain callbacks
- *
- * Note: The radix tree will be allocated later during boot automatically
- * (the reverse mapping will use the slow path until that happens).
- */
-struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
-					 const struct irq_domain_ops *ops,
-					 void *host_data)
-{
-	struct irq_domain *domain = irq_domain_alloc(of_node,
-					IRQ_DOMAIN_MAP_TREE, ops, host_data);
-	if (domain) {
-		INIT_RADIX_TREE(&domain->revmap_data.tree, GFP_KERNEL);
-		irq_domain_add(domain);
-	}
-	return domain;
-}
-EXPORT_SYMBOL_GPL(irq_domain_add_tree);
-
-/**
  * irq_find_host() - Locates a domain for a given device node
  * @node: device-tree node of the interrupt controller
  */
@@ -359,17 +320,13 @@ static void irq_domain_disassociate_many(struct irq_domain *domain,
 		irq_data->domain = NULL;
 		irq_data->hwirq = 0;
 
-		/* Clear reverse map */
-		switch(domain->revmap_type) {
-		case IRQ_DOMAIN_MAP_LINEAR:
-			if (hwirq < domain->revmap_data.linear.size)
-				domain->revmap_data.linear.revmap[hwirq] = 0;
-			break;
-		case IRQ_DOMAIN_MAP_TREE:
+		/* Clear reverse map for this hwirq */
+		if (hwirq < domain->revmap_data.linear.size) {
+			domain->linear_revmap[hwirq] = 0;
+		} else {
 			mutex_lock(&revmap_trees_mutex);
 			radix_tree_delete(&domain->revmap_data.tree, hwirq);
 			mutex_unlock(&revmap_trees_mutex);
-			break;
 		}
 	}
 }
@@ -421,16 +378,12 @@ int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
 				domain->name = irq_data->chip->name;
 		}
 
-		switch (domain->revmap_type) {
-		case IRQ_DOMAIN_MAP_LINEAR:
-			if (hwirq < domain->revmap_data.linear.size)
-				domain->revmap_data.linear.revmap[hwirq] = virq;
-			break;
-		case IRQ_DOMAIN_MAP_TREE:
+		if (hwirq < domain->revmap_data.linear.size) {
+			domain->linear_revmap[hwirq] = virq;
+		} else {
 			mutex_lock(&revmap_trees_mutex);
 			radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data);
 			mutex_unlock(&revmap_trees_mutex);
-			break;
 		}
 
 		irq_clear_status_flags(virq, IRQ_NOREQUEST);
@@ -667,13 +620,6 @@ unsigned int irq_find_mapping(struct irq_domain *domain,
 	switch (domain->revmap_type) {
 	case IRQ_DOMAIN_MAP_LINEAR:
 		return irq_linear_revmap(domain, hwirq);
-	case IRQ_DOMAIN_MAP_TREE:
-		rcu_read_lock();
-		data = radix_tree_lookup(&domain->revmap_data.tree, hwirq);
-		rcu_read_unlock();
-		if (data)
-			return data->irq;
-		break;
 	case IRQ_DOMAIN_MAP_NOMAP:
 		data = irq_get_irq_data(hwirq);
 		if (data && (data->domain == domain) && (data->hwirq == hwirq))
@@ -696,13 +642,18 @@ EXPORT_SYMBOL_GPL(irq_find_mapping);
 unsigned int irq_linear_revmap(struct irq_domain *domain,
 			       irq_hw_number_t hwirq)
 {
+	struct irq_data *data;
 	BUG_ON(domain->revmap_type != IRQ_DOMAIN_MAP_LINEAR);
 
 	/* Check revmap bounds; complain if exceeded */
-	if (WARN_ON(hwirq >= domain->revmap_data.linear.size))
-		return 0;
+	if (hwirq >= domain->revmap_data.linear.size) {
+		rcu_read_lock();
+		data = radix_tree_lookup(&domain->revmap_data.tree, hwirq);
+		rcu_read_unlock();
+		return data ? data->irq : 0;
+	}
 
-	return domain->revmap_data.linear.revmap[hwirq];
+	return domain->linear_revmap[hwirq];
 }
 EXPORT_SYMBOL_GPL(irq_linear_revmap);