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-rw-r--r--include/linux/irqdomain.h18
-rw-r--r--kernel/irq/irqdomain.c107
2 files changed, 39 insertions, 86 deletions
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index e5e513c..1cbb741 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);
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index b1b5e67..5a1d8ec 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);
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