diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 1cbb7413c121..51ef84a3c990 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -73,50 +73,42 @@ struct irq_domain_chip_generic;
/**
* struct irq_domain - Hardware interrupt number translation object
* @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.
+ * @name: Name of interrupt domain
* @ops: pointer to irq_domain methods
* @host_data: private data pointer for use by owner. Not touched by irq_domain
* core code.
- * @irq_base: Start of irq_desc range assigned to the irq_domain. The creator
- * of the irq_domain is responsible for allocating the array of
- * irq_desc structures.
- * @nr_irq: Number of irqs managed by the irq domain
- * @hwirq_base: Starting number for hwirqs managed by the irq domain
- * @of_node: (optional) Pointer to device tree nodes associated with the
- * irq_domain. Used when decoding device tree interrupt specifiers.
+ *
+ * Optional elements
+ * @of_node: Pointer to device tree nodes associated with the irq_domain. Used
+ * when decoding device tree interrupt specifiers.
+ * @gc: Pointer to a list of generic chips. There is a helper function for
+ * setting up one or more generic chips for interrupt controllers
+ * drivers using the generic chip library which uses this pointer.
+ *
+ * Revmap data, used internally by irq_domain
+ * @revmap_direct_max_irq: The largest hwirq that can be set for controllers that
+ * support direct mapping
+ * @revmap_size: Size of the linear map table @linear_revmap[]
+ * @revmap_tree: Radix map tree for hwirqs that don't fit in the linear map
+ * @linear_revmap: Linear table of hwirq->virq reverse mappings
*/
struct irq_domain {
struct list_head link;
const char *name;
-
- /* type of reverse mapping_technique */
- unsigned int revmap_type;
- struct {
- struct {
- unsigned int size;
- } linear;
- struct {
- unsigned int max_irq;
- } nomap;
- struct radix_tree_root tree;
- } revmap_data;
const struct irq_domain_ops *ops;
void *host_data;
- irq_hw_number_t inval_irq;
- /* Optional device node pointer */
+ /* Optional data */
struct device_node *of_node;
- /* Optional pointer to generic interrupt chips */
struct irq_domain_chip_generic *gc;
- /* Linear reverse map */
+ /* reverse map data. The linear map gets appended to the irq_domain */
+ unsigned int revmap_direct_max_irq;
+ unsigned int revmap_size;
+ struct radix_tree_root revmap_tree;
unsigned int linear_revmap[];
};
-#define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */
-#define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */
-
#ifdef CONFIG_IRQ_DOMAIN
struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
unsigned int size,
diff --git a/kernel/irq/generic-chip.c b/kernel/irq/generic-chip.c
index ca98cc5d6308..4b011064e146 100644
--- a/kernel/irq/generic-chip.c
+++ b/kernel/irq/generic-chip.c
@@ -270,10 +270,7 @@ int irq_alloc_domain_generic_chips(struct irq_domain *d, int irqs_per_chip,
if (d->gc)
return -EBUSY;
- if (d->revmap_type != IRQ_DOMAIN_MAP_LINEAR)
- return -EINVAL;
-
- numchips = d->revmap_data.linear.size / irqs_per_chip;
+ numchips = d->revmap_size / irqs_per_chip;
if (!numchips)
return -EINVAL;
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 5a1d8ec8509e..c38be78fceb4 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -25,7 +25,6 @@ static struct irq_domain *irq_default_domain;
/**
* irq_domain_alloc() - Allocate a new irq_domain data structure
* @of_node: optional device-tree node of the interrupt controller
- * @revmap_type: type of reverse mapping to use
* @ops: map/unmap domain callbacks
* @host_data: Controller private data pointer
*
@@ -34,7 +33,7 @@ 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, int size,
+ int size,
const struct irq_domain_ops *ops,
void *host_data)
{
@@ -46,12 +45,11 @@ static struct irq_domain *irq_domain_alloc(struct device_node *of_node,
return NULL;
/* Fill structure */
- INIT_RADIX_TREE(&domain->revmap_data.tree, GFP_KERNEL);
- domain->revmap_type = revmap_type;
+ INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
domain->ops = ops;
domain->host_data = host_data;
domain->of_node = of_node_get(of_node);
- domain->revmap_data.linear.size = size;
+ domain->revmap_size = size;
return domain;
}
@@ -67,8 +65,7 @@ static void irq_domain_add(struct irq_domain *domain)
mutex_lock(&irq_domain_mutex);
list_add(&domain->link, &irq_domain_list);
mutex_unlock(&irq_domain_mutex);
- pr_debug("Allocated domain of type %d @0x%p\n",
- domain->revmap_type, domain);
+ pr_debug("Added domain %s\n", domain->name);
}
/**
@@ -88,7 +85,7 @@ void irq_domain_remove(struct irq_domain *domain)
* node when all entries are removed. Shout if there are
* any mappings left.
*/
- WARN_ON(domain->revmap_data.tree.height);
+ WARN_ON(domain->revmap_tree.height);
list_del(&domain->link);
@@ -100,8 +97,7 @@ void irq_domain_remove(struct irq_domain *domain)
mutex_unlock(&irq_domain_mutex);
- pr_debug("Removed domain of type %d @0x%p\n",
- domain->revmap_type, domain);
+ pr_debug("Removed domain %s\n", domain->name);
irq_domain_free(domain);
}
@@ -216,7 +212,7 @@ struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
{
struct irq_domain *domain;
- domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LINEAR, size, ops, host_data);
+ domain = irq_domain_alloc(of_node, size, ops, host_data);
if (!domain)
return NULL;
@@ -230,10 +226,9 @@ struct irq_domain *irq_domain_add_nomap(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_NOMAP, 0, ops, host_data);
+ struct irq_domain *domain = irq_domain_alloc(of_node, 0, ops, host_data);
if (domain) {
- domain->revmap_data.nomap.max_irq = max_irq ? max_irq : ~0;
+ domain->revmap_direct_max_irq = max_irq ? max_irq : ~0;
irq_domain_add(domain);
}
return domain;
@@ -321,11 +316,11 @@ static void irq_domain_disassociate_many(struct irq_domain *domain,
irq_data->hwirq = 0;
/* Clear reverse map for this hwirq */
- if (hwirq < domain->revmap_data.linear.size) {
+ if (hwirq < domain->revmap_size) {
domain->linear_revmap[hwirq] = 0;
} else {
mutex_lock(&revmap_trees_mutex);
- radix_tree_delete(&domain->revmap_data.tree, hwirq);
+ radix_tree_delete(&domain->revmap_tree, hwirq);
mutex_unlock(&revmap_trees_mutex);
}
}
@@ -378,11 +373,11 @@ int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
domain->name = irq_data->chip->name;
}
- if (hwirq < domain->revmap_data.linear.size) {
+ if (hwirq < domain->revmap_size) {
domain->linear_revmap[hwirq] = virq;
} else {
mutex_lock(&revmap_trees_mutex);
- radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data);
+ radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
mutex_unlock(&revmap_trees_mutex);
}
@@ -399,7 +394,9 @@ EXPORT_SYMBOL_GPL(irq_domain_associate_many);
*
* This routine is used for irq controllers which can choose the hardware
* interrupt numbers they generate. In such a case it's simplest to use
- * the linux irq as the hardware interrupt number.
+ * the linux irq as the hardware interrupt number. It still uses the linear
+ * or radix tree to store the mapping, but the irq controller can optimize
+ * the revmap path by using the hwirq directly.
*/
unsigned int irq_create_direct_mapping(struct irq_domain *domain)
{
@@ -408,17 +405,14 @@ unsigned int irq_create_direct_mapping(struct irq_domain *domain)
if (domain == NULL)
domain = irq_default_domain;
- if (WARN_ON(!domain || domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP))
- return 0;
-
virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
if (!virq) {
pr_debug("create_direct virq allocation failed\n");
return 0;
}
- if (virq >= domain->revmap_data.nomap.max_irq) {
+ if (virq >= domain->revmap_direct_max_irq) {
pr_err("ERROR: no free irqs available below %i maximum\n",
- domain->revmap_data.nomap.max_irq);
+ domain->revmap_direct_max_irq);
irq_free_desc(virq);
return 0;
}
@@ -617,17 +611,13 @@ unsigned int irq_find_mapping(struct irq_domain *domain,
if (domain == NULL)
return 0;
- switch (domain->revmap_type) {
- case IRQ_DOMAIN_MAP_LINEAR:
- return irq_linear_revmap(domain, hwirq);
- case IRQ_DOMAIN_MAP_NOMAP:
+ if (hwirq < domain->revmap_direct_max_irq) {
data = irq_get_irq_data(hwirq);
if (data && (data->domain == domain) && (data->hwirq == hwirq))
return hwirq;
- break;
}
- return 0;
+ return irq_linear_revmap(domain, hwirq);
}
EXPORT_SYMBOL_GPL(irq_find_mapping);
@@ -643,12 +633,11 @@ 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 (hwirq >= domain->revmap_data.linear.size) {
+ if (hwirq >= domain->revmap_size) {
rcu_read_lock();
- data = radix_tree_lookup(&domain->revmap_data.tree, hwirq);
+ data = radix_tree_lookup(&domain->revmap_tree, hwirq);
rcu_read_unlock();
return data ? data->irq : 0;
}