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Commit cc79ca69 authored by Grant Likely's avatar Grant Likely
Browse files

irq_domain: Move irq_domain code from powerpc to kernel/irq 



This patch only moves the code.  It doesn't make any changes, and the
code is still only compiled for powerpc.  Follow-on patches will generalize
the code for other architectures.

Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Milton Miller <miltonm@bga.com>
Tested-by: default avatarOlof Johansson <olof@lixom.net>
parent 6d9285b0

arch/powerpc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -135,6 +135,7 @@ config PPC 
	select HAVE_GENERIC_HARDIRQS

	select HAVE_SPARSE_IRQ

	select IRQ_PER_CPU

	select IRQ_DOMAIN

	select GENERIC_IRQ_SHOW

	select GENERIC_IRQ_SHOW_LEVEL

	select IRQ_FORCED_THREADING

arch/powerpc/include/asm/irq.h

+0 −144
Original line number Diff line number Diff line
@@ -42,154 +42,10 @@ extern atomic_t ppc_n_lost_interrupts; 
/* Same thing, used by the generic IRQ code */

#define NR_IRQS_LEGACY		NUM_ISA_INTERRUPTS



/*

 * The host code and data structures are fairly agnostic to the fact that

 * we use an open firmware device-tree. We do have references to struct

 * device_node in two places: in irq_find_host() to find the host matching

 * a given interrupt controller node, and of course as an argument to its

 * counterpart host->ops->match() callback. However, those are treated as

 * generic pointers by the core and the fact that it's actually a device-node

 * pointer is purely a convention between callers and implementation. This

 * code could thus be used on other architectures by replacing those two

 * by some sort of arch-specific void * "token" used to identify interrupt

 * controllers.

 */



struct irq_data;

extern irq_hw_number_t irqd_to_hwirq(struct irq_data *d);

extern irq_hw_number_t virq_to_hw(unsigned int virq);



/**

 * irq_alloc_host - Allocate a new irq_domain data structure

 * @of_node: optional device-tree node of the interrupt controller

 * @revmap_type: type of reverse mapping to use

 * @revmap_arg: for IRQ_DOMAIN_MAP_LINEAR linear only: size of the map

 * @ops: map/unmap host callbacks

 * @inval_irq: provide a hw number in that host space that is always invalid

 *

 * Allocates and initialize and irq_domain structure. Note that in the case of

 * IRQ_DOMAIN_MAP_LEGACY, the map() callback will be called before this returns

 * for all legacy interrupts except 0 (which is always the invalid irq for

 * a legacy controller). For a IRQ_DOMAIN_MAP_LINEAR, the map is allocated by

 * this call as well. For a IRQ_DOMAIN_MAP_TREE, the radix tree will be allocated

 * later during boot automatically (the reverse mapping will use the slow path

 * until that happens).

 */

extern struct irq_domain *irq_alloc_host(struct device_node *of_node,

				       unsigned int revmap_type,

				       unsigned int revmap_arg,

				       struct irq_domain_ops *ops,

				       irq_hw_number_t inval_irq);





/**

 * irq_find_host - Locates a host for a given device node

 * @node: device-tree node of the interrupt controller

 */

extern struct irq_domain *irq_find_host(struct device_node *node);





/**

 * irq_set_default_host - Set a "default" host

 * @host: default host pointer

 *

 * For convenience, it's possible to set a "default" host that will be used

 * whenever NULL is passed to irq_create_mapping(). It makes life easier for

 * platforms that want to manipulate a few hard coded interrupt numbers that

 * aren't properly represented in the device-tree.

 */

extern void irq_set_default_host(struct irq_domain *host);





/**

 * irq_set_virq_count - Set the maximum number of virt irqs

 * @count: number of linux virtual irqs, capped with NR_IRQS

 *

 * This is mainly for use by platforms like iSeries who want to program

 * the virtual irq number in the controller to avoid the reverse mapping

 */

extern void irq_set_virq_count(unsigned int count);





/**

 * irq_create_mapping - Map a hardware interrupt into linux virq space

 * @host: host owning this hardware interrupt or NULL for default host

 * @hwirq: hardware irq number in that host space

 *

 * Only one mapping per hardware interrupt is permitted. Returns a linux

 * virq number.

 * If the sense/trigger is to be specified, set_irq_type() should be called

 * on the number returned from that call.

 */

extern unsigned int irq_create_mapping(struct irq_domain *host,

				       irq_hw_number_t hwirq);





/**

 * irq_dispose_mapping - Unmap an interrupt

 * @virq: linux virq number of the interrupt to unmap

 */

extern void irq_dispose_mapping(unsigned int virq);



/**

 * irq_find_mapping - Find a linux virq from an hw irq number.

 * @host: host owning this hardware interrupt

 * @hwirq: hardware irq number in that host space

 *

 * This is a slow path, for use by generic code. It's expected that an

 * irq controller implementation directly calls the appropriate low level

 * mapping function.

 */

extern unsigned int irq_find_mapping(struct irq_domain *host,

				     irq_hw_number_t hwirq);



/**

 * irq_create_direct_mapping - Allocate a virq for direct mapping

 * @host: host to allocate the virq for or NULL for default host

 *

 * This routine is used for irq controllers which can choose the hardware

 * interrupt numbers they generate. In such a case it's simplest to use

 * the linux virq as the hardware interrupt number.

 */

extern unsigned int irq_create_direct_mapping(struct irq_domain *host);



/**

 * irq_radix_revmap_insert - Insert a hw irq to linux virq number mapping.

 * @host: host owning this hardware interrupt

 * @virq: linux irq number

 * @hwirq: hardware irq number in that host space

 *

 * This is for use by irq controllers that use a radix tree reverse

 * mapping for fast lookup.

 */

extern void irq_radix_revmap_insert(struct irq_domain *host, unsigned int virq,

				    irq_hw_number_t hwirq);



/**

 * irq_radix_revmap_lookup - Find a linux virq from a hw irq number.

 * @host: host owning this hardware interrupt

 * @hwirq: hardware irq number in that host space

 *

 * This is a fast path, for use by irq controller code that uses radix tree

 * revmaps

 */

extern unsigned int irq_radix_revmap_lookup(struct irq_domain *host,

					    irq_hw_number_t hwirq);



/**

 * irq_linear_revmap - Find a linux virq from a hw irq number.

 * @host: host owning this hardware interrupt

 * @hwirq: hardware irq number in that host space

 *

 * This is a fast path, for use by irq controller code that uses linear

 * revmaps. It does fallback to the slow path if the revmap doesn't exist

 * yet and will create the revmap entry with appropriate locking

 */



extern unsigned int irq_linear_revmap(struct irq_domain *host,

				      irq_hw_number_t hwirq);





/**

 * irq_early_init - Init irq remapping subsystem

 */

arch/powerpc/kernel/irq.c

+0 −502
Original line number Diff line number Diff line
@@ -486,17 +486,6 @@ void do_softirq(void) 
	local_irq_restore(flags);

}





/*

 * IRQ controller and virtual interrupts

 */



static LIST_HEAD(irq_domain_list);

static DEFINE_MUTEX(irq_domain_mutex);

static DEFINE_MUTEX(revmap_trees_mutex);

static unsigned int irq_virq_count = NR_IRQS;

static struct irq_domain *irq_default_host;



irq_hw_number_t irqd_to_hwirq(struct irq_data *d)

{

	return d->hwirq;
@@ -510,362 +499,6 @@ irq_hw_number_t virq_to_hw(unsigned int virq) 
}

EXPORT_SYMBOL_GPL(virq_to_hw);



static int default_irq_host_match(struct irq_domain *h, struct device_node *np)

{

	return h->of_node != NULL && h->of_node == np;

}



struct irq_domain *irq_alloc_host(struct device_node *of_node,

				unsigned int revmap_type,

				unsigned int revmap_arg,

				struct irq_domain_ops *ops,

				irq_hw_number_t inval_irq)

{

	struct irq_domain *host, *h;

	unsigned int size = sizeof(struct irq_domain);

	unsigned int i;

	unsigned int *rmap;



	/* Allocate structure and revmap table if using linear mapping */

	if (revmap_type == IRQ_DOMAIN_MAP_LINEAR)

		size += revmap_arg * sizeof(unsigned int);

	host = kzalloc(size, GFP_KERNEL);

	if (host == NULL)

		return NULL;



	/* Fill structure */

	host->revmap_type = revmap_type;

	host->inval_irq = inval_irq;

	host->ops = ops;

	host->of_node = of_node_get(of_node);



	if (host->ops->match == NULL)

		host->ops->match = default_irq_host_match;



	mutex_lock(&irq_domain_mutex);

	/* Make sure only one legacy controller can be created */

	if (revmap_type == IRQ_DOMAIN_MAP_LEGACY) {

		list_for_each_entry(h, &irq_domain_list, link) {

			if (WARN_ON(h->revmap_type == IRQ_DOMAIN_MAP_LEGACY)) {

				mutex_unlock(&irq_domain_mutex);

				of_node_put(host->of_node);

				kfree(host);

				return NULL;

			}

		}

	}

	list_add(&host->link, &irq_domain_list);

	mutex_unlock(&irq_domain_mutex);



	/* Additional setups per revmap type */

	switch(revmap_type) {

	case IRQ_DOMAIN_MAP_LEGACY:

		/* 0 is always the invalid number for legacy */

		host->inval_irq = 0;

		/* setup us as the host for all legacy interrupts */

		for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {

			struct irq_data *irq_data = irq_get_irq_data(i);

			irq_data->hwirq = i;

			irq_data->domain = host;



			/* Legacy flags are left to default at this point,

			 * one can then use irq_create_mapping() to

			 * explicitly change them

			 */

			ops->map(host, i, i);



			/* Clear norequest flags */

			irq_clear_status_flags(i, IRQ_NOREQUEST);

		}

		break;

	case IRQ_DOMAIN_MAP_LINEAR:

		rmap = (unsigned int *)(host + 1);

		for (i = 0; i < revmap_arg; i++)

			rmap[i] = NO_IRQ;

		host->revmap_data.linear.size = revmap_arg;

		host->revmap_data.linear.revmap = rmap;

		break;

	case IRQ_DOMAIN_MAP_TREE:

		INIT_RADIX_TREE(&host->revmap_data.tree, GFP_KERNEL);

		break;

	default:

		break;

	}



	pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);



	return host;

}



struct irq_domain *irq_find_host(struct device_node *node)

{

	struct irq_domain *h, *found = NULL;



	/* We might want to match the legacy controller last since

	 * it might potentially be set to match all interrupts in

	 * the absence of a device node. This isn't a problem so far

	 * yet though...

	 */

	mutex_lock(&irq_domain_mutex);

	list_for_each_entry(h, &irq_domain_list, link)

		if (h->ops->match(h, node)) {

			found = h;

			break;

		}

	mutex_unlock(&irq_domain_mutex);

	return found;

}

EXPORT_SYMBOL_GPL(irq_find_host);



void irq_set_default_host(struct irq_domain *host)

{

	pr_debug("irq: Default host set to @0x%p\n", host);



	irq_default_host = host;

}



void irq_set_virq_count(unsigned int count)

{

	pr_debug("irq: Trying to set virq count to %d\n", count);



	BUG_ON(count < NUM_ISA_INTERRUPTS);

	if (count < NR_IRQS)

		irq_virq_count = count;

}



static int irq_setup_virq(struct irq_domain *host, unsigned int virq,

			    irq_hw_number_t hwirq)

{

	struct irq_data *irq_data = irq_get_irq_data(virq);



	irq_data->hwirq = hwirq;

	irq_data->domain = host;

	if (host->ops->map(host, virq, hwirq)) {

		pr_debug("irq: -> mapping failed, freeing\n");

		irq_data->domain = NULL;

		irq_data->hwirq = 0;

		return -1;

	}



	irq_clear_status_flags(virq, IRQ_NOREQUEST);



	return 0;

}



unsigned int irq_create_direct_mapping(struct irq_domain *host)

{

	unsigned int virq;



	if (host == NULL)

		host = irq_default_host;



	BUG_ON(host == NULL);

	WARN_ON(host->revmap_type != IRQ_DOMAIN_MAP_NOMAP);



	virq = irq_alloc_desc_from(1, 0);

	if (virq == NO_IRQ) {

		pr_debug("irq: create_direct virq allocation failed\n");

		return NO_IRQ;

	}

	if (virq >= irq_virq_count) {

		pr_err("ERROR: no free irqs available below %i maximum\n",

			irq_virq_count);

		irq_free_desc(virq);

		return 0;

	}



	pr_debug("irq: create_direct obtained virq %d\n", virq);



	if (irq_setup_virq(host, virq, virq)) {

		irq_free_desc(virq);

		return NO_IRQ;

	}



	return virq;

}



unsigned int irq_create_mapping(struct irq_domain *host,

				irq_hw_number_t hwirq)

{

	unsigned int virq, hint;



	pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);



	/* Look for default host if nececssary */

	if (host == NULL)

		host = irq_default_host;

	if (host == NULL) {

		printk(KERN_WARNING "irq_create_mapping called for"

		       " NULL host, hwirq=%lx\n", hwirq);

		WARN_ON(1);

		return NO_IRQ;

	}

	pr_debug("irq: -> using host @%p\n", host);



	/* Check if mapping already exists */

	virq = irq_find_mapping(host, hwirq);

	if (virq != NO_IRQ) {

		pr_debug("irq: -> existing mapping on virq %d\n", virq);

		return virq;

	}



	/* Get a virtual interrupt number */

	if (host->revmap_type == IRQ_DOMAIN_MAP_LEGACY) {

		/* Handle legacy */

		virq = (unsigned int)hwirq;

		if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)

			return NO_IRQ;

		return virq;

	} else {

		/* Allocate a virtual interrupt number */

		hint = hwirq % irq_virq_count;

		if (hint == 0)

			hint = 1;

		virq = irq_alloc_desc_from(hint, 0);

		if (!virq)

			virq = irq_alloc_desc_from(1, 0);

		if (virq == NO_IRQ) {

			pr_debug("irq: -> virq allocation failed\n");

			return NO_IRQ;

		}

	}



	if (irq_setup_virq(host, virq, hwirq)) {

		if (host->revmap_type != IRQ_DOMAIN_MAP_LEGACY)

			irq_free_desc(virq);

		return NO_IRQ;

	}



	pr_debug("irq: irq %lu on host %s mapped to virtual irq %u\n",

		hwirq, host->of_node ? host->of_node->full_name : "null", virq);



	return virq;

}

EXPORT_SYMBOL_GPL(irq_create_mapping);



unsigned int irq_create_of_mapping(struct device_node *controller,

				   const u32 *intspec, unsigned int intsize)

{

	struct irq_domain *host;

	irq_hw_number_t hwirq;

	unsigned int type = IRQ_TYPE_NONE;

	unsigned int virq;



	if (controller == NULL)

		host = irq_default_host;

	else

		host = irq_find_host(controller);

	if (host == NULL) {

		printk(KERN_WARNING "irq: no irq host found for %s !\n",

		       controller->full_name);

		return NO_IRQ;

	}



	/* If host has no translation, then we assume interrupt line */

	if (host->ops->xlate == NULL)

		hwirq = intspec[0];

	else {

		if (host->ops->xlate(host, controller, intspec, intsize,

				     &hwirq, &type))

			return NO_IRQ;

	}



	/* Create mapping */

	virq = irq_create_mapping(host, hwirq);

	if (virq == NO_IRQ)

		return virq;



	/* Set type if specified and different than the current one */

	if (type != IRQ_TYPE_NONE &&

	    type != (irqd_get_trigger_type(irq_get_irq_data(virq))))

		irq_set_irq_type(virq, type);

	return virq;

}

EXPORT_SYMBOL_GPL(irq_create_of_mapping);



void irq_dispose_mapping(unsigned int virq)

{

	struct irq_data *irq_data = irq_get_irq_data(virq);

	struct irq_domain *host;

	irq_hw_number_t hwirq;



	if (virq == NO_IRQ || !irq_data)

		return;



	host = irq_data->domain;

	if (WARN_ON(host == NULL))

		return;



	/* Never unmap legacy interrupts */

	if (host->revmap_type == IRQ_DOMAIN_MAP_LEGACY)

		return;



	irq_set_status_flags(virq, IRQ_NOREQUEST);



	/* remove chip and handler */

	irq_set_chip_and_handler(virq, NULL, NULL);



	/* Make sure it's completed */

	synchronize_irq(virq);



	/* Tell the PIC about it */

	if (host->ops->unmap)

		host->ops->unmap(host, virq);

	smp_mb();



	/* Clear reverse map */

	hwirq = irq_data->hwirq;

	switch(host->revmap_type) {

	case IRQ_DOMAIN_MAP_LINEAR:

		if (hwirq < host->revmap_data.linear.size)

			host->revmap_data.linear.revmap[hwirq] = NO_IRQ;

		break;

	case IRQ_DOMAIN_MAP_TREE:

		mutex_lock(&revmap_trees_mutex);

		radix_tree_delete(&host->revmap_data.tree, hwirq);

		mutex_unlock(&revmap_trees_mutex);

		break;

	}



	/* Destroy map */

	irq_data->hwirq = host->inval_irq;



	irq_free_desc(virq);

}

EXPORT_SYMBOL_GPL(irq_dispose_mapping);



unsigned int irq_find_mapping(struct irq_domain *host,

			      irq_hw_number_t hwirq)

{

	unsigned int i;

	unsigned int hint = hwirq % irq_virq_count;



	/* Look for default host if nececssary */

	if (host == NULL)

		host = irq_default_host;

	if (host == NULL)

		return NO_IRQ;



	/* legacy -> bail early */

	if (host->revmap_type == IRQ_DOMAIN_MAP_LEGACY)

		return hwirq;



	/* Slow path does a linear search of the map */

	if (hint == 0)

		hint = 1;

	i = hint;

	do {

		struct irq_data *data = irq_get_irq_data(i);

		if (data && (data->domain == host) && (data->hwirq == hwirq))

			return i;

		i++;

		if (i >= irq_virq_count)

			i = 1;

	} while(i != hint);

	return NO_IRQ;

}

EXPORT_SYMBOL_GPL(irq_find_mapping);



#ifdef CONFIG_SMP

int irq_choose_cpu(const struct cpumask *mask)

{
@@ -902,146 +535,11 @@ int irq_choose_cpu(const struct cpumask *mask) 
}

#endif



unsigned int irq_radix_revmap_lookup(struct irq_domain *host,

				     irq_hw_number_t hwirq)

{

	struct irq_data *irq_data;



	if (WARN_ON_ONCE(host->revmap_type != IRQ_DOMAIN_MAP_TREE))

		return irq_find_mapping(host, hwirq);



	/*

	 * Freeing an irq can delete nodes along the path to

	 * do the lookup via call_rcu.

	 */

	rcu_read_lock();

	irq_data = radix_tree_lookup(&host->revmap_data.tree, hwirq);

	rcu_read_unlock();



	/*

	 * If found in radix tree, then fine.

	 * Else fallback to linear lookup - this should not happen in practice

	 * as it means that we failed to insert the node in the radix tree.

	 */

	return irq_data ? irq_data->irq : irq_find_mapping(host, hwirq);

}



void irq_radix_revmap_insert(struct irq_domain *host, unsigned int virq,

			     irq_hw_number_t hwirq)

{

	struct irq_data *irq_data = irq_get_irq_data(virq);



	if (WARN_ON(host->revmap_type != IRQ_DOMAIN_MAP_TREE))

		return;



	if (virq != NO_IRQ) {

		mutex_lock(&revmap_trees_mutex);

		radix_tree_insert(&host->revmap_data.tree, hwirq, irq_data);

		mutex_unlock(&revmap_trees_mutex);

	}

}



unsigned int irq_linear_revmap(struct irq_domain *host,

			       irq_hw_number_t hwirq)

{

	unsigned int *revmap;



	if (WARN_ON_ONCE(host->revmap_type != IRQ_DOMAIN_MAP_LINEAR))

		return irq_find_mapping(host, hwirq);



	/* Check revmap bounds */

	if (unlikely(hwirq >= host->revmap_data.linear.size))

		return irq_find_mapping(host, hwirq);



	/* Check if revmap was allocated */

	revmap = host->revmap_data.linear.revmap;

	if (unlikely(revmap == NULL))

		return irq_find_mapping(host, hwirq);



	/* Fill up revmap with slow path if no mapping found */

	if (unlikely(revmap[hwirq] == NO_IRQ))

		revmap[hwirq] = irq_find_mapping(host, hwirq);



	return revmap[hwirq];

}



int arch_early_irq_init(void)

{

	return 0;

}



#ifdef CONFIG_VIRQ_DEBUG

static int virq_debug_show(struct seq_file *m, void *private)

{

	unsigned long flags;

	struct irq_desc *desc;

	const char *p;

	static const char none[] = "none";

	void *data;

	int i;



	seq_printf(m, "%-5s  %-7s  %-15s  %-18s  %s\n", "virq", "hwirq",

		      "chip name", "chip data", "host name");



	for (i = 1; i < nr_irqs; i++) {

		desc = irq_to_desc(i);

		if (!desc)

			continue;



		raw_spin_lock_irqsave(&desc->lock, flags);



		if (desc->action && desc->action->handler) {

			struct irq_chip *chip;



			seq_printf(m, "%5d  ", i);

			seq_printf(m, "0x%05lx  ", desc->irq_data.hwirq);



			chip = irq_desc_get_chip(desc);

			if (chip && chip->name)

				p = chip->name;

			else

				p = none;

			seq_printf(m, "%-15s  ", p);



			data = irq_desc_get_chip_data(desc);

			seq_printf(m, "0x%16p  ", data);



			if (desc->irq_data.domain->of_node)

				p = desc->irq_data.domain->of_node->full_name;

			else

				p = none;

			seq_printf(m, "%s\n", p);

		}



		raw_spin_unlock_irqrestore(&desc->lock, flags);

	}



	return 0;

}



static int virq_debug_open(struct inode *inode, struct file *file)

{

	return single_open(file, virq_debug_show, inode->i_private);

}



static const struct file_operations virq_debug_fops = {

	.open = virq_debug_open,

	.read = seq_read,

	.llseek = seq_lseek,

	.release = single_release,

};



static int __init irq_debugfs_init(void)

{

	if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root,

				 NULL, &virq_debug_fops) == NULL)

		return -ENOMEM;



	return 0;

}

__initcall(irq_debugfs_init);

#endif /* CONFIG_VIRQ_DEBUG */



#ifdef CONFIG_PPC64

static int __init setup_noirqdistrib(char *str)

{

include/linux/irqdomain.h

+42 −4
Original line number Diff line number Diff line
@@ -16,6 +16,17 @@ 
 * (though a domain can cover more than one PIC if they have a flat number

 * model). It's the domain callbacks that are responsible for setting the

 * irq_chip on a given irq_desc after it's been mapped.

 *

 * The host code and data structures are agnostic to whether or not

 * we use an open firmware device-tree. We do have references to struct

 * device_node in two places: in irq_find_host() to find the host matching

 * a given interrupt controller node, and of course as an argument to its

 * counterpart domain->ops->match() callback. However, those are treated as

 * generic pointers by the core and the fact that it's actually a device-node

 * pointer is purely a convention between callers and implementation. This

 * code could thus be used on other architectures by replacing those two

 * by some sort of arch-specific void * "token" used to identify interrupt

 * controllers.

 */



#ifndef _LINUX_IRQDOMAIN_H
@@ -108,6 +119,32 @@ struct irq_domain { 
};



#ifdef CONFIG_IRQ_DOMAIN

#ifdef CONFIG_PPC

extern struct irq_domain *irq_alloc_host(struct device_node *of_node,

				       unsigned int revmap_type,

				       unsigned int revmap_arg,

				       struct irq_domain_ops *ops,

				       irq_hw_number_t inval_irq);

extern struct irq_domain *irq_find_host(struct device_node *node);

extern void irq_set_default_host(struct irq_domain *host);

extern void irq_set_virq_count(unsigned int count);





extern unsigned int irq_create_mapping(struct irq_domain *host,

				       irq_hw_number_t hwirq);

extern void irq_dispose_mapping(unsigned int virq);

extern unsigned int irq_find_mapping(struct irq_domain *host,

				     irq_hw_number_t hwirq);

extern unsigned int irq_create_direct_mapping(struct irq_domain *host);

extern void irq_radix_revmap_insert(struct irq_domain *host, unsigned int virq,

				    irq_hw_number_t hwirq);

extern unsigned int irq_radix_revmap_lookup(struct irq_domain *host,

					    irq_hw_number_t hwirq);

extern unsigned int irq_linear_revmap(struct irq_domain *host,

				      irq_hw_number_t hwirq);



#else /* CONFIG_PPC */



/**

 * irq_domain_to_irq() - Translate from a hardware irq to a linux irq number

 *
@@ -137,15 +174,16 @@ extern void irq_domain_add(struct irq_domain *domain); 
extern void irq_domain_del(struct irq_domain *domain);



extern struct irq_domain_ops irq_domain_simple_ops;

#endif /* CONFIG_IRQ_DOMAIN */



#if defined(CONFIG_IRQ_DOMAIN) && defined(CONFIG_OF_IRQ)

#if defined(CONFIG_OF_IRQ)

extern void irq_domain_add_simple(struct device_node *controller, int irq_base);

extern void irq_domain_generate_simple(const struct of_device_id *match,

					u64 phys_base, unsigned int irq_start);

#else /* CONFIG_IRQ_DOMAIN && CONFIG_OF_IRQ */

#else /* CONFIG_OF_IRQ */

static inline void irq_domain_generate_simple(const struct of_device_id *match,

					u64 phys_base, unsigned int irq_start) { }

#endif /* CONFIG_IRQ_DOMAIN && CONFIG_OF_IRQ */

#endif /* !CONFIG_OF_IRQ */

#endif /* !CONFIG_PPC */

#endif /* CONFIG_IRQ_DOMAIN */



#endif /* _LINUX_IRQDOMAIN_H */

kernel/irq/irqdomain.c

+600 −0

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