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authorGrant Likely <grant.likely@linaro.org>2013-06-10 04:06:02 +0400
committerGrant Likely <grant.likely@linaro.org>2013-06-24 17:01:42 +0400
commitddaf144c61da45ae5c49ae38556c3ac4524f9318 (patch)
tree6992bedc5f2a620f7b4e4dadfce76658e7667d35 /kernel/irq
parent1400ea86025a22862f97e7fe544433751b43ecec (diff)
downloadlinux-ddaf144c61da45ae5c49ae38556c3ac4524f9318.tar.xz
irqdomain: Refactor irq_domain_associate_many()
Originally, irq_domain_associate_many() was designed to unwind the mapped irqs on a failure of any individual association. However, that proved to be a problem with certain IRQ controllers. Some of them only support a subset of irqs, and will fail when attempting to map a reserved IRQ. In those cases we want to map as many IRQs as possible, so instead it is better for irq_domain_associate_many() to make a best-effort attempt to map irqs, but not fail if any or all of them don't succeed. If a caller really cares about how many irqs got associated, then it should instead go back and check that all of the irqs is cares about were mapped. The original design open-coded the individual association code into the body of irq_domain_associate_many(), but with no longer needing to unwind associations, the code becomes simpler to split out irq_domain_associate() to contain the bulk of the logic, and irq_domain_associate_many() to be a simple loop wrapper. This patch also adds a new error check to the associate path to make sure it isn't called for an irq larger than the controller can handle, and adds locking so that the irq_domain_mutex is held while setting up a new association. v3: Fixup missing change to irq_domain_add_tree() v2: Fixup x86 warning. irq_domain_associate_many() no longer returns an error code, but reports errors to the printk log directly. In the majority of cases we don't actually want to fail if there is a problem, but rather log it and still try to boot the system. Signed-off-by: Grant Likely <grant.likely@linaro.org> irqdomain: Fix flubbed irq_domain_associate_many refactoring commit d39046ec72, "irqdomain: Refactor irq_domain_associate_many()" was missing the following hunk which causes a boot failure on anything using irq_domain_add_tree() to allocate an irq domain. Signed-off-by: Grant Likely <grant.likely@linaro.org> Cc: Michael Neuling <mikey@neuling.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>, Cc: Thomas Gleixner <tglx@linutronix.de>, Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/irqdomain.c185
1 files changed, 91 insertions, 94 deletions
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 280b8047d8db..80e92492c77b 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -35,8 +35,8 @@ static struct irq_domain *irq_default_domain;
* register allocated irq_domain with irq_domain_register(). Returns pointer
* to IRQ domain, or NULL on failure.
*/
-struct irq_domain *__irq_domain_add(struct device_node *of_node,
- int size, int direct_max,
+struct irq_domain *__irq_domain_add(struct device_node *of_node, int size,
+ irq_hw_number_t hwirq_max, int direct_max,
const struct irq_domain_ops *ops,
void *host_data)
{
@@ -52,6 +52,7 @@ struct irq_domain *__irq_domain_add(struct device_node *of_node,
domain->ops = ops;
domain->host_data = host_data;
domain->of_node = of_node_get(of_node);
+ domain->hwirq_max = hwirq_max;
domain->revmap_size = size;
domain->revmap_direct_max_irq = direct_max;
@@ -126,7 +127,7 @@ struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
{
struct irq_domain *domain;
- domain = __irq_domain_add(of_node, size, 0, ops, host_data);
+ domain = __irq_domain_add(of_node, size, size, 0, ops, host_data);
if (!domain)
return NULL;
@@ -139,7 +140,7 @@ struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
first_irq);
}
- WARN_ON(irq_domain_associate_many(domain, first_irq, 0, size));
+ irq_domain_associate_many(domain, first_irq, 0, size);
}
return domain;
@@ -170,11 +171,12 @@ struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
{
struct irq_domain *domain;
- domain = __irq_domain_add(of_node, first_hwirq + size, 0, ops, host_data);
+ domain = __irq_domain_add(of_node, first_hwirq + size,
+ first_hwirq + size, 0, ops, host_data);
if (!domain)
return NULL;
- WARN_ON(irq_domain_associate_many(domain, first_irq, first_hwirq, size));
+ irq_domain_associate_many(domain, first_irq, first_hwirq, size);
return domain;
}
@@ -228,109 +230,109 @@ void irq_set_default_host(struct irq_domain *domain)
}
EXPORT_SYMBOL_GPL(irq_set_default_host);
-static void irq_domain_disassociate_many(struct irq_domain *domain,
- unsigned int irq_base, int count)
+static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
{
- /*
- * disassociate in reverse order;
- * not strictly necessary, but nice for unwinding
- */
- while (count--) {
- int irq = irq_base + count;
- struct irq_data *irq_data = irq_get_irq_data(irq);
- irq_hw_number_t hwirq;
+ struct irq_data *irq_data = irq_get_irq_data(irq);
+ irq_hw_number_t hwirq;
- if (WARN_ON(!irq_data || irq_data->domain != domain))
- continue;
+ if (WARN(!irq_data || irq_data->domain != domain,
+ "virq%i doesn't exist; cannot disassociate\n", irq))
+ return;
- hwirq = irq_data->hwirq;
- irq_set_status_flags(irq, IRQ_NOREQUEST);
+ hwirq = irq_data->hwirq;
+ irq_set_status_flags(irq, IRQ_NOREQUEST);
- /* remove chip and handler */
- irq_set_chip_and_handler(irq, NULL, NULL);
+ /* remove chip and handler */
+ irq_set_chip_and_handler(irq, NULL, NULL);
- /* Make sure it's completed */
- synchronize_irq(irq);
+ /* Make sure it's completed */
+ synchronize_irq(irq);
- /* Tell the PIC about it */
- if (domain->ops->unmap)
- domain->ops->unmap(domain, irq);
- smp_mb();
+ /* Tell the PIC about it */
+ if (domain->ops->unmap)
+ domain->ops->unmap(domain, irq);
+ smp_mb();
- irq_data->domain = NULL;
- irq_data->hwirq = 0;
+ irq_data->domain = NULL;
+ irq_data->hwirq = 0;
- /* Clear reverse map for this hwirq */
- if (hwirq < domain->revmap_size) {
- domain->linear_revmap[hwirq] = 0;
- } else {
- mutex_lock(&revmap_trees_mutex);
- radix_tree_delete(&domain->revmap_tree, hwirq);
- mutex_unlock(&revmap_trees_mutex);
- }
+ /* Clear reverse map for this hwirq */
+ if (hwirq < domain->revmap_size) {
+ domain->linear_revmap[hwirq] = 0;
+ } else {
+ mutex_lock(&revmap_trees_mutex);
+ radix_tree_delete(&domain->revmap_tree, hwirq);
+ mutex_unlock(&revmap_trees_mutex);
}
}
-int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
- irq_hw_number_t hwirq_base, int count)
+int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
+ irq_hw_number_t hwirq)
{
- unsigned int virq = irq_base;
- irq_hw_number_t hwirq = hwirq_base;
- int i, ret;
+ struct irq_data *irq_data = irq_get_irq_data(virq);
+ int ret;
- pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
- of_node_full_name(domain->of_node), irq_base, (int)hwirq_base, count);
+ if (WARN(hwirq >= domain->hwirq_max,
+ "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
+ return -EINVAL;
+ if (WARN(!irq_data, "error: virq%i is not allocated", virq))
+ return -EINVAL;
+ if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
+ return -EINVAL;
- for (i = 0; i < count; i++) {
- struct irq_data *irq_data = irq_get_irq_data(virq + i);
-
- if (WARN(!irq_data, "error: irq_desc not allocated; "
- "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i))
- return -EINVAL;
- if (WARN(irq_data->domain, "error: irq_desc already associated; "
- "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i))
- return -EINVAL;
- };
-
- for (i = 0; i < count; i++, virq++, hwirq++) {
- struct irq_data *irq_data = irq_get_irq_data(virq);
-
- irq_data->hwirq = hwirq;
- irq_data->domain = domain;
- if (domain->ops->map) {
- ret = domain->ops->map(domain, virq, hwirq);
- if (ret != 0) {
- /*
- * If map() returns -EPERM, this interrupt is protected
- * by the firmware or some other service and shall not
- * be mapped. Don't bother telling the user about it.
- */
- if (ret != -EPERM) {
- pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
- domain->name, hwirq, virq, ret);
- }
- irq_data->domain = NULL;
- irq_data->hwirq = 0;
- continue;
+ mutex_lock(&irq_domain_mutex);
+ irq_data->hwirq = hwirq;
+ irq_data->domain = domain;
+ if (domain->ops->map) {
+ ret = domain->ops->map(domain, virq, hwirq);
+ if (ret != 0) {
+ /*
+ * If map() returns -EPERM, this interrupt is protected
+ * by the firmware or some other service and shall not
+ * be mapped. Don't bother telling the user about it.
+ */
+ if (ret != -EPERM) {
+ pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
+ domain->name, hwirq, virq, ret);
}
- /* If not already assigned, give the domain the chip's name */
- if (!domain->name && irq_data->chip)
- domain->name = irq_data->chip->name;
+ irq_data->domain = NULL;
+ irq_data->hwirq = 0;
+ mutex_unlock(&irq_domain_mutex);
+ return ret;
}
- if (hwirq < domain->revmap_size) {
- domain->linear_revmap[hwirq] = virq;
- } else {
- mutex_lock(&revmap_trees_mutex);
- radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
- mutex_unlock(&revmap_trees_mutex);
- }
+ /* If not already assigned, give the domain the chip's name */
+ if (!domain->name && irq_data->chip)
+ domain->name = irq_data->chip->name;
+ }
- irq_clear_status_flags(virq, IRQ_NOREQUEST);
+ if (hwirq < domain->revmap_size) {
+ domain->linear_revmap[hwirq] = virq;
+ } else {
+ mutex_lock(&revmap_trees_mutex);
+ radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
+ mutex_unlock(&revmap_trees_mutex);
}
+ mutex_unlock(&irq_domain_mutex);
+
+ irq_clear_status_flags(virq, IRQ_NOREQUEST);
return 0;
}
+EXPORT_SYMBOL_GPL(irq_domain_associate);
+
+void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
+ irq_hw_number_t hwirq_base, int count)
+{
+ int i;
+
+ pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
+ of_node_full_name(domain->of_node), irq_base, (int)hwirq_base, count);
+
+ for (i = 0; i < count; i++) {
+ irq_domain_associate(domain, irq_base + i, hwirq_base + i);
+ }
+}
EXPORT_SYMBOL_GPL(irq_domain_associate_many);
/**
@@ -460,12 +462,7 @@ int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base,
if (unlikely(ret < 0))
return ret;
- ret = irq_domain_associate_many(domain, irq_base, hwirq_base, count);
- if (unlikely(ret < 0)) {
- irq_free_descs(irq_base, count);
- return ret;
- }
-
+ irq_domain_associate_many(domain, irq_base, hwirq_base, count);
return 0;
}
EXPORT_SYMBOL_GPL(irq_create_strict_mappings);
@@ -535,7 +532,7 @@ void irq_dispose_mapping(unsigned int virq)
if (WARN_ON(domain == NULL))
return;
- irq_domain_disassociate_many(domain, virq, 1);
+ irq_domain_disassociate(domain, virq);
irq_free_desc(virq);
}
EXPORT_SYMBOL_GPL(irq_dispose_mapping);