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authorThomas Gleixner2016-06-13 16:33:48 +0200
committerThomas Gleixner2016-06-13 16:34:16 +0200
commita5c8a01968fc9dc94f182172cee7ab40bc496ea4 (patch)
treeaba78887ff90a9a4efc11a548e6ca70131c74973 /kernel/irq
parentff5b706f5189fe8d2a6fd576b491b769ec1d29d3 (diff)
parent3faf24ea894a34887c0ca412f1643540251b9d82 (diff)
Merge tag 'irqchip-for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into irq/core
First drop of irqchip updates for 4.8 from Marc Zyngier: - Fix a few bugs in configuring the default trigger from the irqdomain layer - Make the genirq layer PM aware - Add PM capability to the ARM GIC driver - Add support for 2-level translation tables to the GICv3 ITS driver
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/chip.c40
-rw-r--r--kernel/irq/internals.h1
-rw-r--r--kernel/irq/irqdomain.c58
-rw-r--r--kernel/irq/manage.c45
4 files changed, 134 insertions, 10 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 2f9f2b0e79f2..ad8131473774 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -1093,3 +1093,43 @@ int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
return 0;
}
+
+/**
+ * irq_chip_pm_get - Enable power for an IRQ chip
+ * @data: Pointer to interrupt specific data
+ *
+ * Enable the power to the IRQ chip referenced by the interrupt data
+ * structure.
+ */
+int irq_chip_pm_get(struct irq_data *data)
+{
+ int retval;
+
+ if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device) {
+ retval = pm_runtime_get_sync(data->chip->parent_device);
+ if (retval < 0) {
+ pm_runtime_put_noidle(data->chip->parent_device);
+ return retval;
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * irq_chip_pm_put - Disable power for an IRQ chip
+ * @data: Pointer to interrupt specific data
+ *
+ * Disable the power to the IRQ chip referenced by the interrupt data
+ * structure, belongs. Note that power will only be disabled, once this
+ * function has been called for all IRQs that have called irq_chip_pm_get().
+ */
+int irq_chip_pm_put(struct irq_data *data)
+{
+ int retval = 0;
+
+ if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device)
+ retval = pm_runtime_put(data->chip->parent_device);
+
+ return (retval < 0) ? retval : 0;
+}
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 09be2c903c6d..d5edcdc9382a 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -7,6 +7,7 @@
*/
#include <linux/irqdesc.h>
#include <linux/kernel_stat.h>
+#include <linux/pm_runtime.h>
#ifdef CONFIG_SPARSE_IRQ
# define IRQ_BITMAP_BITS (NR_IRQS + 8196)
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 8798b6c9e945..caa6a63d26f0 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -567,6 +567,7 @@ static void of_phandle_args_to_fwspec(struct of_phandle_args *irq_data,
unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
{
struct irq_domain *domain;
+ struct irq_data *irq_data;
irq_hw_number_t hwirq;
unsigned int type = IRQ_TYPE_NONE;
int virq;
@@ -588,15 +589,46 @@ unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
if (irq_domain_translate(domain, fwspec, &hwirq, &type))
return 0;
- if (irq_domain_is_hierarchy(domain)) {
+ /*
+ * WARN if the irqchip returns a type with bits
+ * outside the sense mask set and clear these bits.
+ */
+ if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK))
+ type &= IRQ_TYPE_SENSE_MASK;
+
+ /*
+ * If we've already configured this interrupt,
+ * don't do it again, or hell will break loose.
+ */
+ virq = irq_find_mapping(domain, hwirq);
+ if (virq) {
+ /*
+ * If the trigger type is not specified or matches the
+ * current trigger type then we are done so return the
+ * interrupt number.
+ */
+ if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
+ return virq;
+
/*
- * If we've already configured this interrupt,
- * don't do it again, or hell will break loose.
+ * If the trigger type has not been set yet, then set
+ * it now and return the interrupt number.
*/
- virq = irq_find_mapping(domain, hwirq);
- if (virq)
+ if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) {
+ irq_data = irq_get_irq_data(virq);
+ if (!irq_data)
+ return 0;
+
+ irqd_set_trigger_type(irq_data, type);
return virq;
+ }
+
+ pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
+ hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
+ return 0;
+ }
+ if (irq_domain_is_hierarchy(domain)) {
virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, fwspec);
if (virq <= 0)
return 0;
@@ -607,10 +639,18 @@ unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
return virq;
}
- /* Set type if specified and different than the current one */
- if (type != IRQ_TYPE_NONE &&
- type != irq_get_trigger_type(virq))
- irq_set_irq_type(virq, type);
+ irq_data = irq_get_irq_data(virq);
+ if (!irq_data) {
+ if (irq_domain_is_hierarchy(domain))
+ irq_domain_free_irqs(virq, 1);
+ else
+ irq_dispose_mapping(virq);
+ return 0;
+ }
+
+ /* Store trigger type */
+ irqd_set_trigger_type(irq_data, type);
+
return virq;
}
EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index ef0bc02c3a70..00cfc852cca8 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1117,6 +1117,13 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
new->irq = irq;
/*
+ * If the trigger type is not specified by the caller,
+ * then use the default for this interrupt.
+ */
+ if (!(new->flags & IRQF_TRIGGER_MASK))
+ new->flags |= irqd_get_trigger_type(&desc->irq_data);
+
+ /*
* Check whether the interrupt nests into another interrupt
* thread.
*/
@@ -1409,10 +1416,18 @@ int setup_irq(unsigned int irq, struct irqaction *act)
if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc)))
return -EINVAL;
+
+ retval = irq_chip_pm_get(&desc->irq_data);
+ if (retval < 0)
+ return retval;
+
chip_bus_lock(desc);
retval = __setup_irq(irq, desc, act);
chip_bus_sync_unlock(desc);
+ if (retval)
+ irq_chip_pm_put(&desc->irq_data);
+
return retval;
}
EXPORT_SYMBOL_GPL(setup_irq);
@@ -1506,6 +1521,7 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
}
}
+ irq_chip_pm_put(&desc->irq_data);
module_put(desc->owner);
kfree(action->secondary);
return action;
@@ -1648,11 +1664,16 @@ int request_threaded_irq(unsigned int irq, irq_handler_t handler,
action->name = devname;
action->dev_id = dev_id;
+ retval = irq_chip_pm_get(&desc->irq_data);
+ if (retval < 0)
+ return retval;
+
chip_bus_lock(desc);
retval = __setup_irq(irq, desc, action);
chip_bus_sync_unlock(desc);
if (retval) {
+ irq_chip_pm_put(&desc->irq_data);
kfree(action->secondary);
kfree(action);
}
@@ -1730,7 +1751,14 @@ void enable_percpu_irq(unsigned int irq, unsigned int type)
if (!desc)
return;
+ /*
+ * If the trigger type is not specified by the caller, then
+ * use the default for this interrupt.
+ */
type &= IRQ_TYPE_SENSE_MASK;
+ if (type == IRQ_TYPE_NONE)
+ type = irqd_get_trigger_type(&desc->irq_data);
+
if (type != IRQ_TYPE_NONE) {
int ret;
@@ -1822,6 +1850,7 @@ static struct irqaction *__free_percpu_irq(unsigned int irq, void __percpu *dev_
unregister_handler_proc(irq, action);
+ irq_chip_pm_put(&desc->irq_data);
module_put(desc->owner);
return action;
@@ -1884,10 +1913,18 @@ int setup_percpu_irq(unsigned int irq, struct irqaction *act)
if (!desc || !irq_settings_is_per_cpu_devid(desc))
return -EINVAL;
+
+ retval = irq_chip_pm_get(&desc->irq_data);
+ if (retval < 0)
+ return retval;
+
chip_bus_lock(desc);
retval = __setup_irq(irq, desc, act);
chip_bus_sync_unlock(desc);
+ if (retval)
+ irq_chip_pm_put(&desc->irq_data);
+
return retval;
}
@@ -1931,12 +1968,18 @@ int request_percpu_irq(unsigned int irq, irq_handler_t handler,
action->name = devname;
action->percpu_dev_id = dev_id;
+ retval = irq_chip_pm_get(&desc->irq_data);
+ if (retval < 0)
+ return retval;
+
chip_bus_lock(desc);
retval = __setup_irq(irq, desc, action);
chip_bus_sync_unlock(desc);
- if (retval)
+ if (retval) {
+ irq_chip_pm_put(&desc->irq_data);
kfree(action);
+ }
return retval;
}