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>
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 @@
* 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 @@
{
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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);