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Commit 66296954 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

Merge branch 'irq/for-gpio' into irq/core 

Merge the flow handlers and irq domain extensions which are in a separate
branch so they can be consumed by the gpio folks.
parents 50091212 495c38d3

include/linux/irq.h

+2 −0
Original line number Diff line number Diff line
@@ -568,6 +568,8 @@ extern int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg); 
extern int irq_chip_pm_get(struct irq_data *data);

extern int irq_chip_pm_put(struct irq_data *data);

#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY

extern void handle_fasteoi_ack_irq(struct irq_desc *desc);

extern void handle_fasteoi_mask_irq(struct irq_desc *desc);

extern void irq_chip_enable_parent(struct irq_data *data);

extern void irq_chip_disable_parent(struct irq_data *data);

extern void irq_chip_ack_parent(struct irq_data *data);

include/linux/irqdomain.h

+3 −0
Original line number Diff line number Diff line
@@ -460,6 +460,9 @@ extern void irq_domain_free_irqs_common(struct irq_domain *domain, 
extern void irq_domain_free_irqs_top(struct irq_domain *domain,

				     unsigned int virq, unsigned int nr_irqs);



extern int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg);

extern int irq_domain_pop_irq(struct irq_domain *domain, int virq);



extern int irq_domain_alloc_irqs_parent(struct irq_domain *domain,

					unsigned int irq_base,

					unsigned int nr_irqs, void *arg);

kernel/irq/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -73,6 +73,10 @@ config IRQ_DOMAIN_HIERARCHY 
	bool

	select IRQ_DOMAIN



# Support for hierarchical fasteoi+edge and fasteoi+level handlers

config IRQ_FASTEOI_HIERARCHY_HANDLERS

	bool



# Generic IRQ IPI support

config GENERIC_IRQ_IPI

	bool

kernel/irq/chip.c

+109 −0
Original line number Diff line number Diff line
@@ -1092,6 +1092,112 @@ void irq_cpu_offline(void) 
}



#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY



#ifdef CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS

/**

 *	handle_fasteoi_ack_irq - irq handler for edge hierarchy

 *	stacked on transparent controllers

 *

 *	@desc:	the interrupt description structure for this irq

 *

 *	Like handle_fasteoi_irq(), but for use with hierarchy where

 *	the irq_chip also needs to have its ->irq_ack() function

 *	called.

 */

void handle_fasteoi_ack_irq(struct irq_desc *desc)

{

	struct irq_chip *chip = desc->irq_data.chip;



	raw_spin_lock(&desc->lock);



	if (!irq_may_run(desc))

		goto out;



	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);



	/*

	 * If its disabled or no action available

	 * then mask it and get out of here:

	 */

	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {

		desc->istate |= IRQS_PENDING;

		mask_irq(desc);

		goto out;

	}



	kstat_incr_irqs_this_cpu(desc);

	if (desc->istate & IRQS_ONESHOT)

		mask_irq(desc);



	/* Start handling the irq */

	desc->irq_data.chip->irq_ack(&desc->irq_data);



	preflow_handler(desc);

	handle_irq_event(desc);



	cond_unmask_eoi_irq(desc, chip);



	raw_spin_unlock(&desc->lock);

	return;

out:

	if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))

		chip->irq_eoi(&desc->irq_data);

	raw_spin_unlock(&desc->lock);

}

EXPORT_SYMBOL_GPL(handle_fasteoi_ack_irq);



/**

 *	handle_fasteoi_mask_irq - irq handler for level hierarchy

 *	stacked on transparent controllers

 *

 *	@desc:	the interrupt description structure for this irq

 *

 *	Like handle_fasteoi_irq(), but for use with hierarchy where

 *	the irq_chip also needs to have its ->irq_mask_ack() function

 *	called.

 */

void handle_fasteoi_mask_irq(struct irq_desc *desc)

{

	struct irq_chip *chip = desc->irq_data.chip;



	raw_spin_lock(&desc->lock);

	mask_ack_irq(desc);



	if (!irq_may_run(desc))

		goto out;



	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);



	/*

	 * If its disabled or no action available

	 * then mask it and get out of here:

	 */

	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {

		desc->istate |= IRQS_PENDING;

		mask_irq(desc);

		goto out;

	}



	kstat_incr_irqs_this_cpu(desc);

	if (desc->istate & IRQS_ONESHOT)

		mask_irq(desc);



	preflow_handler(desc);

	handle_irq_event(desc);



	cond_unmask_eoi_irq(desc, chip);



	raw_spin_unlock(&desc->lock);

	return;

out:

	if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))

		chip->irq_eoi(&desc->irq_data);

	raw_spin_unlock(&desc->lock);

}

EXPORT_SYMBOL_GPL(handle_fasteoi_mask_irq);



#endif /* CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS */



/**

 * irq_chip_enable_parent - Enable the parent interrupt (defaults to unmask if

 * NULL)
@@ -1105,6 +1211,7 @@ void irq_chip_enable_parent(struct irq_data *data) 
	else

		data->chip->irq_unmask(data);

}

EXPORT_SYMBOL_GPL(irq_chip_enable_parent);



/**

 * irq_chip_disable_parent - Disable the parent interrupt (defaults to mask if
@@ -1119,6 +1226,7 @@ void irq_chip_disable_parent(struct irq_data *data) 
	else

		data->chip->irq_mask(data);

}

EXPORT_SYMBOL_GPL(irq_chip_disable_parent);



/**

 * irq_chip_ack_parent - Acknowledge the parent interrupt
@@ -1181,6 +1289,7 @@ int irq_chip_set_affinity_parent(struct irq_data *data, 


	return -ENOSYS;

}

EXPORT_SYMBOL_GPL(irq_chip_set_affinity_parent);



/**

 * irq_chip_set_type_parent - Set IRQ type on the parent interrupt

kernel/irq/irqdomain.c

+200 −30
Original line number Diff line number Diff line
@@ -455,6 +455,31 @@ void irq_set_default_host(struct irq_domain *domain) 
}

EXPORT_SYMBOL_GPL(irq_set_default_host);



static void irq_domain_clear_mapping(struct irq_domain *domain,

				     irq_hw_number_t 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);

	}

}



static void irq_domain_set_mapping(struct irq_domain *domain,

				   irq_hw_number_t hwirq,

				   struct irq_data *irq_data)

{

	if (hwirq < domain->revmap_size) {

		domain->linear_revmap[hwirq] = irq_data->irq;

	} else {

		mutex_lock(&revmap_trees_mutex);

		radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);

		mutex_unlock(&revmap_trees_mutex);

	}

}



void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)

{

	struct irq_data *irq_data = irq_get_irq_data(irq);
@@ -483,13 +508,7 @@ void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq) 
	domain->mapcount--;



	/* 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);

	}

	irq_domain_clear_mapping(domain, hwirq);

}



int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
@@ -533,13 +552,7 @@ int irq_domain_associate(struct irq_domain *domain, unsigned int virq, 
	}



	domain->mapcount++;

	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);

	}

	irq_domain_set_mapping(domain, hwirq, irq_data);

	mutex_unlock(&irq_domain_mutex);



	irq_clear_status_flags(virq, IRQ_NOREQUEST);
@@ -1138,16 +1151,9 @@ static void irq_domain_insert_irq(int virq) 


	for (data = irq_get_irq_data(virq); data; data = data->parent_data) {

		struct irq_domain *domain = data->domain;

		irq_hw_number_t hwirq = data->hwirq;



		domain->mapcount++;

		if (hwirq < domain->revmap_size) {

			domain->linear_revmap[hwirq] = virq;

		} else {

			mutex_lock(&revmap_trees_mutex);

			radix_tree_insert(&domain->revmap_tree, hwirq, data);

			mutex_unlock(&revmap_trees_mutex);

		}

		irq_domain_set_mapping(domain, data->hwirq, data);



		/* If not already assigned, give the domain the chip's name */

		if (!domain->name && data->chip)
@@ -1171,13 +1177,7 @@ static void irq_domain_remove_irq(int virq) 
		irq_hw_number_t hwirq = data->hwirq;



		domain->mapcount--;

		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);

		}

		irq_domain_clear_mapping(domain, hwirq);

	}

}
@@ -1362,6 +1362,7 @@ static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain, 
					   unsigned int irq_base,

					   unsigned int nr_irqs)

{

	if (domain->ops->free)

		domain->ops->free(domain, irq_base, nr_irqs);

}
@@ -1448,6 +1449,175 @@ int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base, 
	return ret;

}



/* The irq_data was moved, fix the revmap to refer to the new location */

static void irq_domain_fix_revmap(struct irq_data *d)

{

	void **slot;



	if (d->hwirq < d->domain->revmap_size)

		return; /* Not using radix tree. */



	/* Fix up the revmap. */

	mutex_lock(&revmap_trees_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);

}



/**

 * irq_domain_push_irq() - Push a domain in to the top of a hierarchy.

 * @domain:	Domain to push.

 * @virq:	Irq to push the domain in to.

 * @arg:	Passed to the irq_domain_ops alloc() function.

 *

 * For an already existing irqdomain hierarchy, as might be obtained

 * via a call to pci_enable_msix(), add an additional domain to the

 * head of the processing chain.  Must be called before request_irq()

 * has been called.

 */

int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg)

{

	struct irq_data *child_irq_data;

	struct irq_data *root_irq_data = irq_get_irq_data(virq);

	struct irq_desc *desc;

	int rv = 0;



	/*

	 * Check that no action has been set, which indicates the virq

	 * is in a state where this function doesn't have to deal with

	 * races between interrupt handling and maintaining the

	 * hierarchy.  This will catch gross misuse.  Attempting to

	 * make the check race free would require holding locks across

	 * calls to struct irq_domain_ops->alloc(), which could lead

	 * to deadlock, so we just do a simple check before starting.

	 */

	desc = irq_to_desc(virq);

	if (!desc)

		return -EINVAL;

	if (WARN_ON(desc->action))

		return -EBUSY;



	if (domain == NULL)

		return -EINVAL;



	if (WARN_ON(!irq_domain_is_hierarchy(domain)))

		return -EINVAL;



	if (domain->parent != root_irq_data->domain)

		return -EINVAL;



	if (!root_irq_data)

		return -EINVAL;



	child_irq_data = kzalloc_node(sizeof(*child_irq_data), GFP_KERNEL,

				      irq_data_get_node(root_irq_data));

	if (!child_irq_data)

		return -ENOMEM;



	mutex_lock(&irq_domain_mutex);



	/* Copy the original irq_data. */

	*child_irq_data = *root_irq_data;



	/*

	 * Overwrite the root_irq_data, which is embedded in struct

	 * irq_desc, with values for this domain.

	 */

	root_irq_data->parent_data = child_irq_data;

	root_irq_data->domain = domain;

	root_irq_data->mask = 0;

	root_irq_data->hwirq = 0;

	root_irq_data->chip = NULL;

	root_irq_data->chip_data = NULL;



	/* May (probably does) set hwirq, chip, etc. */

	rv = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);

	if (rv) {

		/* Restore the original irq_data. */

		*root_irq_data = *child_irq_data;

		goto error;

	}



	irq_domain_fix_revmap(child_irq_data);

	irq_domain_set_mapping(domain, root_irq_data->hwirq, root_irq_data);



error:

	mutex_unlock(&irq_domain_mutex);



	return rv;

}

EXPORT_SYMBOL_GPL(irq_domain_push_irq);



/**

 * irq_domain_pop_irq() - Remove a domain from the top of a hierarchy.

 * @domain:	Domain to remove.

 * @virq:	Irq to remove the domain from.

 *

 * Undo the effects of a call to irq_domain_push_irq().  Must be

 * called either before request_irq() or after free_irq().

 */

int irq_domain_pop_irq(struct irq_domain *domain, int virq)

{

	struct irq_data *root_irq_data = irq_get_irq_data(virq);

	struct irq_data *child_irq_data;

	struct irq_data *tmp_irq_data;

	struct irq_desc *desc;



	/*

	 * Check that no action is set, which indicates the virq is in

	 * a state where this function doesn't have to deal with races

	 * between interrupt handling and maintaining the hierarchy.

	 * This will catch gross misuse.  Attempting to make the check

	 * race free would require holding locks across calls to

	 * struct irq_domain_ops->free(), which could lead to

	 * deadlock, so we just do a simple check before starting.

	 */

	desc = irq_to_desc(virq);

	if (!desc)

		return -EINVAL;

	if (WARN_ON(desc->action))

		return -EBUSY;



	if (domain == NULL)

		return -EINVAL;



	if (!root_irq_data)

		return -EINVAL;



	tmp_irq_data = irq_domain_get_irq_data(domain, virq);



	/* We can only "pop" if this domain is at the top of the list */

	if (WARN_ON(root_irq_data != tmp_irq_data))

		return -EINVAL;



	if (WARN_ON(root_irq_data->domain != domain))

		return -EINVAL;



	child_irq_data = root_irq_data->parent_data;

	if (WARN_ON(!child_irq_data))

		return -EINVAL;



	mutex_lock(&irq_domain_mutex);



	root_irq_data->parent_data = NULL;



	irq_domain_clear_mapping(domain, root_irq_data->hwirq);

	irq_domain_free_irqs_hierarchy(domain, virq, 1);



	/* Restore the original irq_data. */

	*root_irq_data = *child_irq_data;



	irq_domain_fix_revmap(root_irq_data);



	mutex_unlock(&irq_domain_mutex);



	kfree(child_irq_data);



	return 0;

}

EXPORT_SYMBOL_GPL(irq_domain_pop_irq);



/**

 * irq_domain_free_irqs - Free IRQ number and associated data structures

 * @virq:	base IRQ number