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Date: Mon, 10 Jun 2013 01:49:18 +0100
From: Grant Likely <grant.likely@...aro.org>
To: linux-kernel@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Thomas Gleixner <tglx@...utronix.de>,
linuxppc-dev@...ts.ozlabs.org,
Grant Likely <grant.likely@...aro.org>
Subject: [RFC 06/10] irqdomain: Clean up aftermath of irq_domain refactoring
After refactoring the irqdomain code, there are a number of API
functions that are merely empty wrappers around core code. Drop those
wrappers out of the C file and replace them with static inlines in the
header.
Signed-off-by: Grant Likely <grant.likely@...aro.org>
---
arch/powerpc/platforms/cell/beat_interrupt.c | 2 +-
arch/powerpc/platforms/powermac/smp.c | 2 +-
include/linux/irqdomain.h | 31 +++++--
kernel/irq/irqdomain.c | 127 ++++++++-------------------
4 files changed, 62 insertions(+), 100 deletions(-)
diff --git a/arch/powerpc/platforms/cell/beat_interrupt.c b/arch/powerpc/platforms/cell/beat_interrupt.c
index 8c6dc42..9e5dfbc 100644
--- a/arch/powerpc/platforms/cell/beat_interrupt.c
+++ b/arch/powerpc/platforms/cell/beat_interrupt.c
@@ -239,7 +239,7 @@ void __init beatic_init_IRQ(void)
ppc_md.get_irq = beatic_get_irq;
/* Allocate an irq host */
- beatic_host = irq_domain_add_nomap(NULL, 0, &beatic_pic_host_ops, NULL);
+ beatic_host = irq_domain_add_nomap(NULL, ~0, &beatic_pic_host_ops, NULL);
BUG_ON(beatic_host == NULL);
irq_set_default_host(beatic_host);
}
diff --git a/arch/powerpc/platforms/powermac/smp.c b/arch/powerpc/platforms/powermac/smp.c
index bdb738a..f921067 100644
--- a/arch/powerpc/platforms/powermac/smp.c
+++ b/arch/powerpc/platforms/powermac/smp.c
@@ -192,7 +192,7 @@ static int psurge_secondary_ipi_init(void)
{
int rc = -ENOMEM;
- psurge_host = irq_domain_add_nomap(NULL, 0, &psurge_host_ops, NULL);
+ psurge_host = irq_domain_add_nomap(NULL, ~0, &psurge_host_ops, NULL);
if (psurge_host)
psurge_secondary_virq = irq_create_direct_mapping(psurge_host);
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 51ef84a..fd4b26f 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -110,6 +110,10 @@ struct irq_domain {
};
#ifdef CONFIG_IRQ_DOMAIN
+struct irq_domain *__irq_domain_add(struct device_node *of_node,
+ int size, int direct_max,
+ const struct irq_domain_ops *ops,
+ void *host_data);
struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
unsigned int size,
unsigned int first_irq,
@@ -121,17 +125,30 @@ struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
irq_hw_number_t first_hwirq,
const struct irq_domain_ops *ops,
void *host_data);
-struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
+extern struct irq_domain *irq_find_host(struct device_node *node);
+extern void irq_set_default_host(struct irq_domain *host);
+
+/**
+ * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
+ * @of_node: pointer to interrupt controller's device tree node.
+ * @size: Number of interrupts in the domain.
+ * @ops: map/unmap domain callbacks
+ * @host_data: Controller private data pointer
+ */
+static inline struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
unsigned int size,
const struct irq_domain_ops *ops,
- void *host_data);
-struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
+ void *host_data)
+{
+ return __irq_domain_add(of_node, size, 0, ops, host_data);
+}
+static inline 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);
-extern struct irq_domain *irq_find_host(struct device_node *node);
-extern void irq_set_default_host(struct irq_domain *host);
-
+ void *host_data)
+{
+ return __irq_domain_add(of_node, 0, max_irq, ops, host_data);
+}
static inline struct irq_domain *irq_domain_add_legacy_isa(
struct device_node *of_node,
const struct irq_domain_ops *ops,
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index c38be78..e0db59e 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -23,8 +23,11 @@ static DEFINE_MUTEX(revmap_trees_mutex);
static struct irq_domain *irq_default_domain;
/**
- * irq_domain_alloc() - Allocate a new irq_domain data structure
+ * __irq_domain_add() - Allocate a new irq_domain data structure
* @of_node: optional device-tree node of the interrupt controller
+ * @size: Size of linear map; 0 for radix mapping only
+ * @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no
+ * direct mapping
* @ops: map/unmap domain callbacks
* @host_data: Controller private data pointer
*
@@ -32,10 +35,10 @@ static struct irq_domain *irq_default_domain;
* register allocated irq_domain with irq_domain_register(). Returns pointer
* to IRQ domain, or NULL on failure.
*/
-static struct irq_domain *irq_domain_alloc(struct device_node *of_node,
- int size,
- const struct irq_domain_ops *ops,
- void *host_data)
+struct irq_domain *__irq_domain_add(struct device_node *of_node,
+ int size, int direct_max,
+ const struct irq_domain_ops *ops,
+ void *host_data)
{
struct irq_domain *domain;
@@ -50,23 +53,16 @@ static struct irq_domain *irq_domain_alloc(struct device_node *of_node,
domain->host_data = host_data;
domain->of_node = of_node_get(of_node);
domain->revmap_size = size;
+ domain->revmap_direct_max_irq = direct_max;
- return domain;
-}
-
-static void irq_domain_free(struct irq_domain *domain)
-{
- of_node_put(domain->of_node);
- kfree(domain);
-}
-
-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("Added domain %s\n", domain->name);
+ return domain;
}
+EXPORT_SYMBOL_GPL(__irq_domain_add);
/**
* irq_domain_remove() - Remove an irq domain.
@@ -99,30 +95,28 @@ void irq_domain_remove(struct irq_domain *domain)
pr_debug("Removed domain %s\n", domain->name);
- irq_domain_free(domain);
+ of_node_put(domain->of_node);
+ kfree(domain);
}
EXPORT_SYMBOL_GPL(irq_domain_remove);
/**
- * irq_domain_add_simple() - Allocate and register a simple irq_domain.
+ * irq_domain_add_simple() - Register an irq_domain and optionally map a range of irqs
* @of_node: pointer to interrupt controller's device tree node.
* @size: total number of irqs in mapping
* @first_irq: first number of irq block assigned to the domain,
- * pass zero to assign irqs on-the-fly. This will result in a
- * linear IRQ domain so it is important to use irq_create_mapping()
- * for each used IRQ, especially when SPARSE_IRQ is enabled.
+ * pass zero to assign irqs on-the-fly. If first_irq is non-zero, then
+ * pre-map all of the irqs in the domain to virqs starting at first_irq.
* @ops: map/unmap domain callbacks
* @host_data: Controller private data pointer
*
- * Allocates a legacy irq_domain if irq_base is positive or a linear
- * domain otherwise. For the legacy domain, IRQ descriptors will also
- * be allocated.
+ * Allocates an irq_domain, and optionally if first_irq is positive then also
+ * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq.
*
* This is intended to implement the expected behaviour for most
- * interrupt controllers which is that a linear mapping should
- * normally be used unless the system requires a legacy mapping in
- * order to support supplying interrupt numbers during non-DT
- * registration of devices.
+ * interrupt controllers. If device tree is used, then first_irq will be 0 and
+ * irqs get mapped dynamically on the fly. However, if the controller requires
+ * static virq assignments (non-DT boot) then it will set that up correctly.
*/
struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
unsigned int size,
@@ -130,33 +124,25 @@ struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
const struct irq_domain_ops *ops,
void *host_data)
{
- if (first_irq > 0) {
- int irq_base;
+ struct irq_domain *domain;
+
+ domain = __irq_domain_add(of_node, size, 0, ops, host_data);
+ if (!domain)
+ return NULL;
+ if (first_irq > 0) {
if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
- /*
- * Set the descriptor allocator to search for a
- * 1-to-1 mapping, such as irq_alloc_desc_at().
- * Use of_node_to_nid() which is defined to
- * numa_node_id() on platforms that have no custom
- * implementation.
- */
- irq_base = irq_alloc_descs(first_irq, first_irq, size,
- of_node_to_nid(of_node));
- if (irq_base < 0) {
+ /* attempt to allocated irq_descs */
+ int rc = irq_alloc_descs(first_irq, first_irq, size,
+ of_node_to_nid(of_node));
+ if (rc < 0)
pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
first_irq);
- irq_base = first_irq;
- }
- } else
- irq_base = first_irq;
-
- return irq_domain_add_legacy(of_node, size, irq_base, 0,
- ops, host_data);
+ }
+ WARN_ON(irq_domain_associate_many(domain, first_irq, 0, size));
}
- /* A linear domain is the default */
- return irq_domain_add_linear(of_node, size, ops, host_data);
+ return domain;
}
EXPORT_SYMBOL_GPL(irq_domain_add_simple);
@@ -184,11 +170,7 @@ struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
{
struct irq_domain *domain;
- pr_debug("Setting up legacy domain virq[%i:%i] ==> hwirq[%i:%i]\n",
- first_irq, first_irq + size - 1,
- (int)first_hwirq, (int)first_hwirq + size -1);
-
- domain = irq_domain_add_linear(of_node, first_hwirq + size, ops, host_data);
+ domain = __irq_domain_add(of_node, first_hwirq + size, 0, ops, host_data);
if (!domain)
return NULL;
@@ -199,43 +181,6 @@ struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
/**
- * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
- * @of_node: pointer to interrupt controller's device tree node.
- * @size: Number of interrupts in the domain.
- * @ops: map/unmap domain callbacks
- * @host_data: Controller private data pointer
- */
-struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
- unsigned int size,
- const struct irq_domain_ops *ops,
- void *host_data)
-{
- struct irq_domain *domain;
-
- domain = irq_domain_alloc(of_node, size, ops, host_data);
- if (!domain)
- return NULL;
-
- irq_domain_add(domain);
- return domain;
-}
-EXPORT_SYMBOL_GPL(irq_domain_add_linear);
-
-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 *domain = irq_domain_alloc(of_node, 0, ops, host_data);
- if (domain) {
- domain->revmap_direct_max_irq = max_irq ? max_irq : ~0;
- irq_domain_add(domain);
- }
- return domain;
-}
-EXPORT_SYMBOL_GPL(irq_domain_add_nomap);
-
-/**
* irq_find_host() - Locates a domain for a given device node
* @node: device-tree node of the interrupt controller
*/
--
1.8.1.2
--
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