irqdomain: Move revmap_trees_mutex to struct irq_domain

The revmap_trees_mutex protects domain->revmap_tree.  There is no
need to make it global because it is allowed to modify revmap_tree
of two different domains concurrently.  Having said that, this would
not be a actual bottleneck because the interrupt map/unmap does not
occur quite often.  Rather, the motivation is to tidy up the code
from a data structure point of view.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 7d0c6c1..df162f7 100644 (file)
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -32,6 +32,7 @@
 #include <linux/types.h>
 #include <linux/irqhandler.h>
 #include <linux/of.h>
+#include <linux/mutex.h>
 #include <linux/radix-tree.h>
 
 struct device_node;
@@ -176,6 +177,7 @@ struct irq_domain {
        unsigned int revmap_direct_max_irq;
        unsigned int revmap_size;
        struct radix_tree_root revmap_tree;
+       struct mutex revmap_tree_mutex;
        unsigned int linear_revmap[];
 };
 

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index b50f737..31d0f9f 100644 (file)
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -21,7 +21,6 @@
 static LIST_HEAD(irq_domain_list);
 static DEFINE_MUTEX(irq_domain_mutex);
 
-static DEFINE_MUTEX(revmap_trees_mutex);
 static struct irq_domain *irq_default_domain;
 
 static void irq_domain_check_hierarchy(struct irq_domain *domain);
@@ -211,6 +210,7 @@ struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
 
        /* Fill structure */
        INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
+       mutex_init(&domain->revmap_tree_mutex);
        domain->ops = ops;
        domain->host_data = host_data;
        domain->hwirq_max = hwirq_max;
@@ -462,9 +462,9 @@ static void irq_domain_clear_mapping(struct irq_domain *domain,
        if (hwirq < domain->revmap_size) {
                domain->linear_revmap[hwirq] = 0;
        } else {
-               mutex_lock(&revmap_trees_mutex);
+               mutex_lock(&domain->revmap_tree_mutex);
                radix_tree_delete(&domain->revmap_tree, hwirq);
-               mutex_unlock(&revmap_trees_mutex);
+               mutex_unlock(&domain->revmap_tree_mutex);
        }
 }
 
@@ -475,9 +475,9 @@ static void irq_domain_set_mapping(struct irq_domain *domain,
        if (hwirq < domain->revmap_size) {
                domain->linear_revmap[hwirq] = irq_data->irq;
        } else {
-               mutex_lock(&revmap_trees_mutex);
+               mutex_lock(&domain->revmap_tree_mutex);
                radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
-               mutex_unlock(&revmap_trees_mutex);
+               mutex_unlock(&domain->revmap_tree_mutex);
        }
 }
 
@@ -1459,11 +1459,11 @@ static void irq_domain_fix_revmap(struct irq_data *d)
                return; /* Not using radix tree. */
 
        /* Fix up the revmap. */
-       mutex_lock(&revmap_trees_mutex);
+       mutex_lock(&d->domain->revmap_tree_mutex);
        slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq);
        if (slot)
                radix_tree_replace_slot(&d->domain->revmap_tree, slot, d);
-       mutex_unlock(&revmap_trees_mutex);
+       mutex_unlock(&d->domain->revmap_tree_mutex);
 }
 
 /**