// SPDX-License-Identifier: GPL-2.0
#define pr_fmt(fmt) "irq: " fmt
#include <linux/acpi.h>
#include <linux/debugfs.h>
#include <linux/hardirq.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdesc.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/topology.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/fs.h>
static LIST_HEAD(irq_domain_list);
static DEFINE_MUTEX(irq_domain_mutex);
static struct irq_domain *irq_default_domain;
static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
unsigned int nr_irqs, int node, void *arg,
bool realloc, const struct irq_affinity_desc *affinity);
static void irq_domain_check_hierarchy(struct irq_domain *domain);
static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq);
struct irqchip_fwid {
struct fwnode_handle fwnode;
unsigned int type;
char *name;
phys_addr_t *pa;
};
#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
static void debugfs_add_domain_dir(struct irq_domain *d);
static void debugfs_remove_domain_dir(struct irq_domain *d);
#else
static inline void debugfs_add_domain_dir(struct irq_domain *d) { }
static inline void debugfs_remove_domain_dir(struct irq_domain *d) { }
#endif
static const char *irqchip_fwnode_get_name(const struct fwnode_handle *fwnode)
{
struct irqchip_fwid *fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
return fwid->name;
}
const struct fwnode_operations irqchip_fwnode_ops = {
.get_name = irqchip_fwnode_get_name,
};
EXPORT_SYMBOL_GPL(irqchip_fwnode_ops);
/**
* __irq_domain_alloc_fwnode - Allocate a fwnode_handle suitable for
* identifying an irq domain
* @type: Type of irqchip_fwnode. See linux/irqdomain.h
* @id: Optional user provided id if name != NULL
* @name: Optional user provided domain name
* @pa: Optional user-provided physical address
*
* Allocate a struct irqchip_fwid, and return a pointer to the embedded
* fwnode_handle (or NULL on failure).
*
* Note: The types IRQCHIP_FWNODE_NAMED and IRQCHIP_FWNODE_NAMED_ID are
* solely to transport name information to irqdomain creation code. The
* node is not stored. For other types the pointer is kept in the irq
* domain struct.
*/
struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
const char *name,
phys_addr_t *pa)
{
struct irqchip_fwid *fwid;
char *n;
fwid = kzalloc(sizeof(*fwid), GFP_KERNEL);
switch (type) {
case IRQCHIP_FWNODE_NAMED:
n = kasprintf(GFP_KERNEL, "%s", name);
break;
case IRQCHIP_FWNODE_NAMED_ID:
n = kasprintf(GFP_KERNEL, "%s-%d", name, id);
break;
default:
n = kasprintf(GFP_KERNEL, "irqchip@%pa", pa);
break;
}
if (!fwid || !n) {
kfree(fwid);
kfree(n);
return NULL;
}
fwid->type = type;
fwid->name = n;
fwid->pa = pa;
fwnode_init(&fwid->fwnode, &irqchip_fwnode_ops);
return &fwid->fwnode;
}
EXPORT_SYMBOL_GPL(__irq_domain_alloc_fwnode);
/**
* irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
* @fwnode: fwnode_handle to free
*
* Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
*/
void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
{
struct irqchip_fwid *fwid;
if (!fwnode || WARN_ON(!is_fwnode_irqchip(fwnode)))
return;
fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
kfree(fwid->name);
kfree(fwid);
}
EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
static int alloc_name(struct irq_domain *domain, char *base, enum irq_domain_bus_token bus_token)
{
if (bus_token == DOMAIN_BUS_ANY)
domain->name = kasprintf(GFP_KERNEL, "%s", base);
else
domain->name = kasprintf(GFP_KERNEL, "%s-%d", base, bus_token);
if (!domain->name)
return -ENOMEM;
domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
return 0;
}
static int alloc_fwnode_name(struct irq_domain *domain, const struct fwnode_handle *fwnode,
enum irq_domain_bus_token bus_token, const char *suffix)
{
const char *sep = suffix ? "-" : "";
const char *suf = suffix ? : "";
char *name;
if (bus_token == DOMAIN_BUS_ANY)
name = kasprintf(GFP_KERNEL, "%pfw%s%s", fwnode, sep, suf);
else
name = kasprintf(GFP_KERNEL, "%pfw%s%s-%d", fwnode, sep, suf, bus_token);
if (!name)
return -ENOMEM;
/*
* fwnode paths contain '/', which debugfs is legitimately unhappy
* about. Replace them with ':', which does the trick and is not as
* offensive as '\'...
*/
domain->name = strreplace(name, '/', ':');
domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
return 0;
}
static int alloc_unknown_name(struct irq_domain *domain, enum irq_domain_bus_token bus_token)
{
static atomic_t unknown_domains;
int id = atomic_inc_return(&unknown_domains);
if (bus_token == DOMAIN_BUS_ANY)
domain->name = kasprintf(GFP_KERNEL, "unknown-%d", id);
else
domain->name = kasprintf(GFP_KERNEL, "unknown-%d-%d", id, bus_token);
if (!domain->name)
return -ENOMEM;
domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
return 0;
}
static int irq_domain_set_name(struct irq_domain *domain, const struct irq_domain_info *info)
{
enum irq_domain_bus_token bus_token = info->bus_token;
const struct fwnode_handle *fwnode = info->fwnode;
if (is_fwnode_irqchip(fwnode)) {
struct irqchip_fwid *fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
/*
* The name_suffix is only intended to be used to avoid a name
* collision when multiple domains are created for a single
* device and the name is picked using a real device node.
* (Typical use-case is regmap-IRQ controllers for devices
* providing more than one physical IRQ.) There should be no
* need to use name_suffix with irqchip-fwnode.
*/
if (info->name_suffix)
return -EINVAL;
switch (fwid->type) {
case IRQCHIP_FWNODE_NAMED:
case IRQCHIP_FWNODE_NAMED_ID:
return alloc_name(domain, fwid->name, bus_token);
default:
domain->name = fwid->name;
if (bus_token != DOMAIN_BUS_ANY)
return alloc_name(domain, fwid->name, bus_token);
}
} else if (is_of_node(fwnode) || is_acpi_device_node(fwnode) || is_software_node(fwnode)) {
return alloc_fwnode_name(domain, fwnode, bus_token, info->name_suffix);
}
if (domain->name)
return 0;
if (fwnode)
pr_err("Invalid fwnode type for irqdomain\n");
return alloc_unknown_name(domain, bus_token);
}
static struct irq_domain *__irq_domain_create(const struct irq_domain_info *info)
{
struct irq_domain *domain;
int err;
if (WARN_ON((info->size && info->direct_max) ||
(!IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) && info->direct_max) ||
(info->direct_max && info->direct_max != info->hwirq_max)))
return ERR_PTR(-EINVAL);
domain = kzalloc_node(struct_size(domain, revmap, info->size),
GFP_KERNEL, of_node_to_nid(to_of_node(info->fwnode)));
if (!domain)
return ERR_PTR(-ENOMEM);
err = irq_domain_set_name(domain, info);
if (err) {
kfree(domain);
return ERR_PTR(err);
}
domain->fwnode = fwnode_handle_get(info->fwnode);
fwnode_dev_initialized(domain->fwnode, true);
/* Fill structure */
INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
domain->ops = info->ops;
domain->host_data = info->host_data;
domain->bus_token = info->bus_token;
domain->hwirq_max = info->hwirq_max;
if (info->direct_max)
domain->flags |= IRQ_DOMAIN_FLAG_NO_MAP;
domain->revmap_size = info->size;
/*
* Hierarchical domains use the domain lock of the root domain
* (innermost domain).
*
* For non-hierarchical domains (as for root domains), the root
* pointer is set to the domain itself so that &domain->root->mutex
* always points to the right lock.
*/
mutex_init(&domain->mutex);
domain->root = domain;
irq_domain_check_hierarchy(domain);
return domain;
}
static void __irq_domain_publish(struct irq_domain *domain)
{
mutex_lock(&irq_domain_mutex);
debugfs_add_domain_dir(domain);
list_add(&domain->link, &irq_domain_list);
mutex_unlock(&irq_domain_mutex);
pr_debug("Added domain %s\n", domain->name);
}
static void irq_domain_free(struct irq_domain *domain)
{
fwnode_dev_initialized(domain->fwnode, false);
fwnode_handle_put(domain->fwnode);
if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
kfree(domain->name);
kfree(domain);
}
static void irq_domain_instantiate_descs(const struct irq_domain_info *info)
{
if (!IS_ENABLED(CONFIG_SPARSE_IRQ))
return;
if (irq_alloc_descs(info->virq_base, info->virq_base, info->size,
of_node_to_nid(to_of_node(info->fwnode))) < 0) {
pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
info->virq_base);
}
}
static struct irq_domain *__irq_domain_instantiate(const struct irq_domain_info *info,
bool cond_alloc_descs, bool force_associate)
{
struct irq_domain *domain;
int err;
domain = __irq_domain_create(info);
if (IS_ERR(domain))
return domain;
domain->flags |= info->domain_flags;
domain->exit = info->exit;
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
if (info->parent) {
domain->root = info->parent->root;
domain->parent = info->parent;
}
#endif
if (info->dgc_info) {
err = irq_domain_alloc_generic_chips(domain, info->dgc_info);
if (err)
goto err_domain_free;
}
if (info->init) {
err = info->init(domain);
if (err)
goto err_domain_gc_remove;
}
__irq_domain_publish(domain);
if (cond_alloc_descs && info->virq_base > 0)
irq_domain_instantiate_descs(info);
/*
* Legacy interrupt domains have a fixed Linux interrupt number
* associated. Other interrupt domains can request association by
* providing a Linux interrupt number > 0.
*/
if (force_associate || info->virq_base > 0) {
irq_domain_associate_many(domain, info->virq_base, info->hwirq_base,
info->size - info->hwirq_base);
}
return domain;
err_domain_gc_remove:
if (info->dgc_info)
irq_domain_remove_generic_chips(domain);
err_domain_free:
irq_domain_free(domain);
return ERR_PTR(err);
}
/**
* irq_domain_instantiate() - Instantiate a new irq domain data structure
* @info: Domain information pointer pointing to the information for this domain
*
* Return: A pointer to the instantiated irq domain or an ERR_PTR value.
*/
struct irq_domain *irq_domain_instantiate(const struct irq_domain_info *info)
{
return __irq_domain_instantiate(info, false, false);
}
EXPORT_SYMBOL_GPL(irq_domain_instantiate);
/**
* irq_domain_remove() - Remove an irq domain.
* @domain: domain to remove
*
* This routine is used to remove an irq domain. The caller must ensure
* that all mappings within the domain have been disposed of prior to
* use, depending on the revmap type.
*/
void irq_domain_remove(struct irq_domain *domain)
{
if (domain->exit)
domain->exit(domain);
mutex_lock(&irq_domain_mutex);
debugfs_remove_domain_dir(domain);
WARN_ON(!radix_tree_empty(&domain->revmap_tree));
list_del(&domain->link);
/*
* If the going away domain is the default one, reset it.
*/
if (unlikely(irq_default_domain == domain))
irq_set_default_host(NULL);
mutex_unlock(&irq_domain_mutex);
if (domain->flags & IRQ_DOMAIN_FLAG_DESTROY_GC)
irq_domain_remove_generic_chips(domain);
pr_debug("Removed domain %s\n", domain->name);
irq_domain_free(domain);
}
EXPORT_SYMBOL_GPL(irq_domain_remove);
void irq_domain_update_bus_token(struct irq_domain *domain,
enum irq_domain_bus_token bus_token)
{
char *name;
if (domain->bus_token == bus_token)
return;
mutex_lock(&irq_domain_mutex);
domain->bus_token = bus_token;
name = kasprintf(GFP_KERNEL, "%s-%d", domain->name, bus_token);
if (!name) {
mutex_unlock(&irq_domain_mutex);
return;
}
debugfs_remove_domain_dir(domain);
if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
kfree(domain->name);
else
domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
domain->name = name;
debugfs_add_domain_dir(domain);
mutex_unlock(&irq_domain_mutex);
}
EXPORT_SYMBOL_GPL(irq_domain_update_bus_token);
/**
* irq_domain_create_simple() - Register an irq_domain and optionally map a range of irqs
* @fwnode: firmware node for the interrupt controller
* @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. If first_irq is non-zero, then
* pre-map all of the irqs in the domain to virqs starting at first_irq.
* @ops: domain callbacks
* @host_data: Controller private data pointer
*
* 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. 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_create_simple(struct fwnode_handle *fwnode,
unsigned int size,
unsigned int first_irq,
const struct irq_domain_ops *ops,
void *host_data)
{
struct irq_domain_info info = {
.fwnode = fwnode,
.size = size,
.hwirq_max = size,
.virq_base = first_irq,
.ops = ops,
.host_data = host_data,
};
struct irq_domain *domain = __irq_domain_instantiate(&info, true, false);
return IS_ERR(domain) ? NULL : domain;
}
EXPORT_SYMBOL_GPL(irq_domain_create_simple);
/**
* irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
* @of_node: pointer to interrupt controller's device tree node.
* @size: total number of irqs in legacy mapping
* @first_irq: first number of irq block assigned to the domain
* @first_hwirq: first hwirq number to use for the translation. Should normally
* be '0', but a positive integer can be used if the effective
* hwirqs numbering does not begin at zero.
* @ops: map/unmap domain callbacks
* @host_data: Controller private data pointer
*
* Note: the map() callback will be called before this function returns
* for all legacy interrupts except 0 (which is always the invalid irq for
* a legacy controller).
*/
struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
unsigned int size,
unsigned int first_irq,
irq_hw_number_t first_hwirq,
const struct irq_domain_ops *ops,
void *host_data)
{
return irq_domain_create_legacy(of_node_to_fwnode(of_node), size,
first_irq, first_hwirq, ops, host_data);
}
EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
struct irq_domain *irq_domain_create_legacy(struct fwnode_handle *fwnode,
unsigned int size,
unsigned int first_irq,
irq_hw_number_t first_hwirq,
const struct irq_domain_ops *ops,
void *host_data)
{
struct irq_domain_info info = {
.fwnode = fwnode,
.size = first_hwirq + size,
.hwirq_max = first_hwirq + size,
.hwirq_base = first_hwirq,
.virq_base = first_irq,
.ops = ops,
.host_data = host_data,
};
struct irq_domain *domain = __irq_domain_instantiate(&info, false, true);
return IS_ERR(domain) ? NULL : domain;
}
EXPORT_SYMBOL_GPL(irq_domain_create_legacy);
/**
* irq_find_matching_fwspec() - Locates a domain for a given fwspec
* @fwspec: FW specifier for an interrupt
* @bus_token: domain-specific data
*/
struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
enum irq_domain_bus_token bus_token)
{
struct irq_domain *h, *found = NULL;
struct fwnode_handle *fwnode = fwspec->fwnode;
int rc;
/*
* 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...
*
* bus_token == DOMAIN_BUS_ANY matches any domain, any other
* values must generate an exact match for the domain to be
* selected.
*/
mutex_lock(&irq_domain_mutex);
list_for_each_entry(h, &irq_domain_list, link) {
if (h->ops->select && bus_token != DOMAIN_BUS_ANY)
rc = h->ops->select(h, fwspec, bus_token);
else if (h->ops->match)
rc = h->ops->match(h, to_of_node(fwnode), bus_token);
else
rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
((bus_token == DOMAIN_BUS_ANY) ||
(h->bus_token == bus_token)));
if (rc) {
found = h;
break;
}
}
mutex_unlock(&irq_domain_mutex);
return found;
}
EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
/**
* irq_set_default_host() - Set a "default" irq domain
* @domain: default domain pointer
*
* For convenience, it's possible to set a "default" domain 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.
*/
void irq_set_default_host(struct irq_domain *domain)
{
pr_debug("Default domain set to @0x%p\n", domain);
irq_default_domain = domain;
}
EXPORT_SYMBOL_GPL(irq_set_default_host);
/**
* irq_get_default_host() - Retrieve the "default" irq domain
*
* Returns: the default domain, if any.
*
* Modern code should never use this. This should only be used on
* systems that cannot implement a firmware->fwnode mapping (which
* both DT and ACPI provide).
*/
struct irq_domain *irq_get_default_host(void)
{
return irq_default_domain;
}
EXPORT_SYMBOL_GPL(irq_get_default_host);
static bool irq_domain_is_nomap(struct irq_domain *domain)
{
return IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) &&
(domain->flags & IRQ_DOMAIN_FLAG_NO_MAP);
}
static void irq_domain_clear_mapping(struct irq_domain *domain,
irq_hw_number_t hwirq)
{
lockdep_assert_held(&domain->root->mutex);
if (irq_domain_is_nomap(domain))
return;
if (hwirq < domain->revmap_size)
rcu_assign_pointer(domain->revmap[hwirq], NULL);
else
radix_tree_delete(&domain->revmap_tree, hwirq);
}
static void irq_domain_set_mapping(struct irq_domain *domain,
irq_hw_number_t hwirq,
struct irq_data *irq_data)
{
/*
* This also makes sure that all domains point to the same root when
* called from irq_domain_insert_irq() for each domain in a hierarchy.
*/
lockdep_assert_held(&domain->root->mutex);
if (irq_domain_is_nomap(domain))
return;
if (hwirq < domain->revmap_size)
rcu_assign_pointer(domain->revmap[hwirq], irq_data);
else
radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
}
static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
{
struct irq_data *irq_data = irq_get_irq_data(irq);
irq_hw_number_t hwirq;
if (WARN(!irq_data || irq_data->domain != domain,
"virq%i doesn't exist; cannot disassociate\n", irq))
return;
hwirq = irq_data->hwirq;
mutex_lock(&domain->root->mutex);
irq_set_status_flags(irq, IRQ_NOREQUEST);
/* remove chip and handler */
irq_set_chip_and_handler(irq, NULL, NULL);
/* Make sure it's completed */
synchronize_irq(irq);
/* Tell the PIC about it */
if (domain->ops->unmap)
domain->ops->unmap(domain, irq);
smp_mb();
irq_data->domain = NULL;
irq_data->hwirq = 0;
domain->mapcount--;
/* Clear reverse map for this hwirq */
irq_domain_clear_mapping(domain, hwirq);
mutex_unlock(&domain->root->mutex);
}
static int irq_domain_associate_locked(struct irq_domain *domain, unsigned int virq,
irq_hw_number_t hwirq)
{
struct irq_data *irq_data = irq_get_irq_data(virq);
int ret;
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;
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;
return ret;
}
}
domain->mapcount++;
irq_domain_set_mapping(domain, hwirq, irq_data);
irq_clear_status_flags(virq, IRQ_NOREQUEST);
return 0;
}
int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
irq_hw_number_t hwirq)
{
int ret;
mutex_lock(&domain->root->mutex);
ret = irq_domain_associate_locked(domain, virq, hwirq);
mutex_unlock(&domain->root->mutex);
return ret;
}
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)
{
struct device_node *of_node;
int i;
of_node = irq_domain_get_of_node(domain);
pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
of_node_full_name(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);
#ifdef CONFIG_IRQ_DOMAIN_NOMAP
/**
* irq_create_direct_mapping() - Allocate an irq for direct mapping
* @domain: domain to allocate the irq for or NULL for default domain
*
* 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 irq as the hardware interrupt number. It still uses the linear
* or radix tree to store the mapping, but the irq controller can optimize
* the revmap path by using the hwirq directly.
*/
unsigned int irq_create_direct_mapping(struct irq_domain *domain)
{
struct device_node *of_node;
unsigned int virq;
if (domain == NULL)
domain = irq_default_domain;
of_node = irq_domain_get_of_node(domain);
virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
if (!virq) {
pr_debug("create_direct virq allocation failed\n");
return 0;
}
if (virq >= domain->hwirq_max) {
pr_err("ERROR: no free irqs available below %lu maximum\n",
domain->hwirq_max);
irq_free_desc(virq);
return 0;
}
pr_debug("create_direct obtained virq %d\n", virq);
if (irq_domain_associate(domain, virq, virq)) {
irq_free_desc(virq);
return 0;
}
return virq;
}
EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
#endif
static unsigned int irq_create_mapping_affinity_locked(struct irq_domain *domain,
irq_hw_number_t hwirq,
const struct irq_affinity_desc *affinity)
{
struct device_node *of_node = irq_domain_get_of_node(domain);
int virq;
pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
/* Allocate a virtual interrupt number */
virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node),
affinity);
if (virq <= 0) {
pr_debug("-> virq allocation failed\n");
return 0;
}
if (irq_domain_associate_locked(domain, virq, hwirq)) {
irq_free_desc(virq);
return 0;
}
pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
hwirq, of_node_full_name(of_node), virq);
return virq;
}
/**
* irq_create_mapping_affinity() - Map a hardware interrupt into linux irq space
* @domain: domain owning this hardware interrupt or NULL for default domain
* @hwirq: hardware irq number in that domain space
* @affinity: irq affinity
*
* Only one mapping per hardware interrupt is permitted. Returns a linux
* irq number.
* If the sense/trigger is to be specified, set_irq_type() should be called
* on the number returned from that call.
*/
unsigned int irq_create_mapping_affinity(struct irq_domain *domain,
irq_hw_number_t hwirq,
const struct irq_affinity_desc *affinity)
{
int virq;
/* Look for default domain if necessary */
if (domain == NULL)
domain = irq_default_domain;
if (domain == NULL) {
WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
return 0;
}
mutex_lock(&domain->root->mutex);
/* Check if mapping already exists */
virq = irq_find_mapping(domain, hwirq);
if (virq) {
pr_debug("existing mapping on virq %d\n", virq);
goto out;
}
virq = irq_create_mapping_affinity_locked(domain, hwirq, affinity);
out:
mutex_unlock(&domain->root->mutex);
return virq;
}
EXPORT_SYMBOL_GPL(irq_create_mapping_affinity);
static int irq_domain_translate(struct irq_domain *d,
struct irq_fwspec *fwspec,
irq_hw_number_t *hwirq, unsigned int *type)
{
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
if (d->ops->translate)
return d->ops->translate(d, fwspec, hwirq, type);
#endif
if (d->ops->xlate)
return d->ops->xlate(d, to_of_node(fwspec->fwnode),
fwspec->param, fwspec->param_count,
hwirq, type);
/* If domain has no translation, then we assume interrupt line */
*hwirq = fwspec->param[0];
return 0;
}
void of_phandle_args_to_fwspec(struct device_node *np, const u32 *args,
unsigned int count, struct irq_fwspec *fwspec)
{
int i;
fwspec->fwnode = of_node_to_fwnode(np);
fwspec->param_count = count;
for (i = 0; i < count; i++)
fwspec->param[i] = args[i];
}
EXPORT_SYMBOL_GPL(of_phandle_args_to_fwspec);
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;
if (fwspec->fwnode) {
domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
if (!domain)
domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
} else {
domain = irq_default_domain;
}
if (!domain) {
pr_warn("no irq domain found for %s !\n",
of_node_full_name(to_of_node(fwspec->fwnode)));
return 0;
}
if (irq_domain_translate(domain, fwspec, &hwirq, &type))
return 0;
/*
* 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;
mutex_lock(&domain->root->mutex);
/*
* 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))
goto out;
/*
* If the trigger type has not been set yet, then set
* it now and return the interrupt number.
*/
if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) {
irq_data = irq_get_irq_data(virq);
if (!irq_data) {
virq = 0;
goto out;
}
irqd_set_trigger_type(irq_data, type);
goto out;
}
pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
virq = 0;
goto out;
}
if (irq_domain_is_hierarchy(domain)) {
if (irq_domain_is_msi_device(domain)) {
mutex_unlock(&domain->root->mutex);
virq = msi_device_domain_alloc_wired(domain, hwirq, type);
mutex_lock(&domain->root->mutex);
} else
virq = irq_domain_alloc_irqs_locked(domain, -1, 1, NUMA_NO_NODE,
fwspec, false, NULL);
if (virq <= 0) {
virq = 0;
goto out;
}
} else {
/* Create mapping */
virq = irq_create_mapping_affinity_locked(domain, hwirq, NULL);
if (!virq)
goto out;
}
irq_data = irq_get_irq_data(virq);
if (WARN_ON(!irq_data)) {
virq = 0;
goto out;
}
/* Store trigger type */
irqd_set_trigger_type(irq_data, type);
out:
mutex_unlock(&domain->root->mutex);
return virq;
}
EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
{
struct irq_fwspec fwspec;
of_phandle_args_to_fwspec(irq_data->np, irq_data->args,
irq_data->args_count, &fwspec);
return irq_create_fwspec_mapping(&fwspec);
}
EXPORT_SYMBOL_GPL(irq_create_of_mapping);
/**
* irq_dispose_mapping() - Unmap an interrupt
* @virq: linux irq number of the interrupt to unmap
*/
void irq_dispose_mapping(unsigned int virq)
{
struct irq_data *irq_data;
struct irq_domain *domain;
irq_data = virq ? irq_get_irq_data(virq) : NULL;
if (!irq_data)
return;
domain = irq_data->domain;
if (WARN_ON(domain == NULL))
return;
if (irq_domain_is_hierarchy(domain)) {
irq_domain_free_one_irq(domain, virq);
} else {
irq_domain_disassociate(domain, virq);
irq_free_desc(virq);
}
}
EXPORT_SYMBOL_GPL(irq_dispose_mapping);
/**
* __irq_resolve_mapping() - Find a linux irq from a hw irq number.
* @domain: domain owning this hardware interrupt
* @hwirq: hardware irq number in that domain space
* @irq: optional pointer to return the Linux irq if required
*
* Returns the interrupt descriptor.
*/
struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain,
irq_hw_number_t hwirq,
unsigned int *irq)
{
struct irq_desc *desc = NULL;
struct irq_data *data;
/* Look for default domain if necessary */
if (domain == NULL)
domain = irq_default_domain;
if (domain == NULL)
return desc;
if (irq_domain_is_nomap(domain)) {
if (hwirq < domain->hwirq_max) {
data = irq_domain_get_irq_data(domain, hwirq);
if (data && data->hwirq == hwirq)
desc = irq_data_to_desc(data);
if (irq && desc)
*irq = hwirq;
}
return desc;
}
rcu_read_lock();
/* Check if the hwirq is in the linear revmap. */
if (hwirq < domain->revmap_size)
data = rcu_dereference(domain->revmap[hwirq]);
else
data = radix_tree_lookup(&domain->revmap_tree, hwirq);
if (likely(data)) {
desc = irq_data_to_desc(data);
if (irq)
*irq = data->irq;
}
rcu_read_unlock();
return desc;
}
EXPORT_SYMBOL_GPL(__irq_resolve_mapping);
/**
* irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
* @d: Interrupt domain involved in the translation
* @ctrlr: The device tree node for the device whose interrupt is translated
* @intspec: The interrupt specifier data from the device tree
* @intsize: The number of entries in @intspec
* @out_hwirq: Pointer to storage for the hardware interrupt number
* @out_type: Pointer to storage for the interrupt type
*
* Device Tree IRQ specifier translation function which works with one cell
* bindings where the cell value maps directly to the hwirq number.
*/
int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
const u32 *intspec, unsigned int intsize,
unsigned long *out_hwirq, unsigned int *out_type)
{
if (WARN_ON(intsize < 1))
return -EINVAL;
*out_hwirq = intspec[0];
*out_type = IRQ_TYPE_NONE;
return 0;
}
EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
/**
* irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
* @d: Interrupt domain involved in the translation
* @ctrlr: The device tree node for the device whose interrupt is translated
* @intspec: The interrupt specifier data from the device tree
* @intsize: The number of entries in @intspec
* @out_hwirq: Pointer to storage for the hardware interrupt number
* @out_type: Pointer to storage for the interrupt type
*
* Device Tree IRQ specifier translation function which works with two cell
* bindings where the cell values map directly to the hwirq number
* and linux irq flags.
*/
int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
const u32 *intspec, unsigned int intsize,
irq_hw_number_t *out_hwirq, unsigned int *out_type)
{
struct irq_fwspec fwspec;
of_phandle_args_to_fwspec(ctrlr, intspec, intsize, &fwspec);
return irq_domain_translate_twocell(d, &fwspec, out_hwirq, out_type);
}
EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
/**
* irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
* @d: Interrupt domain involved in the translation
* @ctrlr: The device tree node for the device whose interrupt is translated
* @intspec: The interrupt specifier data from the device tree
* @intsize: The number of entries in @intspec
* @out_hwirq: Pointer to storage for the hardware interrupt number
* @out_type: Pointer to storage for the interrupt type
*
* Device Tree IRQ specifier translation function which works with either one
* or two cell bindings where the cell values map directly to the hwirq number
* and linux irq flags.
*
* Note: don't use this function unless your interrupt controller explicitly
* supports both one and two cell bindings. For the majority of controllers
* the _onecell() or _twocell() variants above should be used.
*/
int irq_domain_xlate_onetwocell(struct irq_domain *d,
struct device_node *ctrlr,
const u32 *intspec, unsigned int intsize,
unsigned long *out_hwirq, unsigned int *out_type)
{
if (WARN_ON(intsize < 1))
return -EINVAL;
*out_hwirq = intspec[0];
if (intsize > 1)
*out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
else
*out_type = IRQ_TYPE_NONE;
return 0;
}
EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
const struct irq_domain_ops irq_domain_simple_ops = {
.xlate = irq_domain_xlate_onetwocell,
};
EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
/**
* irq_domain_translate_onecell() - Generic translate for direct one cell
* bindings
* @d: Interrupt domain involved in the translation
* @fwspec: The firmware interrupt specifier to translate
* @out_hwirq: Pointer to storage for the hardware interrupt number
* @out_type: Pointer to storage for the interrupt type
*/
int irq_domain_translate_onecell(struct irq_domain *d,
struct irq_fwspec *fwspec,
unsigned long *out_hwirq,
unsigned int *out_type)
{
if (WARN_ON(fwspec->param_count < 1))
return -EINVAL;
*out_hwirq = fwspec->param[0];
*out_type = IRQ_TYPE_NONE;
return 0;
}
EXPORT_SYMBOL_GPL(irq_domain_translate_onecell);
/**
* irq_domain_translate_twocell() - Generic translate for direct two cell
* bindings
* @d: Interrupt domain involved in the translation
* @fwspec: The firmware interrupt specifier to translate
* @out_hwirq: Pointer to storage for the hardware interrupt number
* @out_type: Pointer to storage for the interrupt type
*
* Device Tree IRQ specifier translation function which works with two cell
* bindings where the cell values map directly to the hwirq number
* and linux irq flags.
*/
int irq_domain_translate_twocell(struct irq_domain *d,
struct irq_fwspec *fwspec,
unsigned long *out_hwirq,
unsigned int *out_type)
{
if (WARN_ON(fwspec->param_count < 2))
return -EINVAL;
*out_hwirq = fwspec->param[0];
*out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
return 0;
}
EXPORT_SYMBOL_GPL(irq_domain_translate_twocell);
int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq,
int node, const struct irq_affinity_desc *affinity)
{
unsigned int hint;
if (virq >= 0) {
virq = __irq_alloc_descs(virq, virq, cnt, node, THIS_MODULE,
affinity);
} else {
hint = hwirq % nr_irqs;
if (hint == 0)
hint++;
virq = __irq_alloc_descs(-1, hint, cnt, node, THIS_MODULE,
affinity);
if (virq <= 0 && hint > 1) {
virq = __irq_alloc_descs(-1, 1, cnt, node, THIS_MODULE,
affinity);
}
}
return virq;
}
/**
* irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data
* @irq_data: The pointer to irq_data
*/
void irq_domain_reset_irq_data(struct irq_data *irq_data)
{
irq_data->hwirq = 0;
irq_data->chip = &no_irq_chip;
irq_data->chip_data = NULL;
}
EXPORT_SYMBOL_GPL(irq_domain_reset_irq_data);
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
/**
* irq_domain_create_hierarchy - Add a irqdomain into the hierarchy
* @parent: Parent irq domain to associate with the new domain
* @flags: Irq domain flags associated to the domain
* @size: Size of the domain. See below
* @fwnode: Optional fwnode of the interrupt controller
* @ops: Pointer to the interrupt domain callbacks
* @host_data: Controller private data pointer
*
* If @size is 0 a tree domain is created, otherwise a linear domain.
*
* If successful the parent is associated to the new domain and the
* domain flags are set.
* Returns pointer to IRQ domain, or NULL on failure.
*/
struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
unsigned int flags,
unsigned int size,
struct fwnode_handle *fwnode,
const struct irq_domain_ops *ops,
void *host_data)
{
struct irq_domain_info info = {
.fwnode = fwnode,
.size = size,
.hwirq_max = size,
.ops = ops,
.host_data = host_data,
.domain_flags = flags,
.parent = parent,
};
struct irq_domain *d;
if (!info.size)
info.hwirq_max = ~0U;
d = irq_domain_instantiate(&info);
return IS_ERR(d) ? NULL : d;
}
EXPORT_SYMBOL_GPL(irq_domain_create_hierarchy);
static void irq_domain_insert_irq(int virq)
{
struct irq_data *data;
for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
struct irq_domain *domain = data->domain;
domain->mapcount++;
irq_domain_set_mapping(domain, data->hwirq, data);
}
irq_clear_status_flags(virq, IRQ_NOREQUEST);
}
static void irq_domain_remove_irq(int virq)
{
struct irq_data *data;
irq_set_status_flags(virq, IRQ_NOREQUEST);
irq_set_chip_and_handler(virq, NULL, NULL);
synchronize_irq(virq);
smp_mb();
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--;
irq_domain_clear_mapping(domain, hwirq);
}
}
static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
struct irq_data *child)
{
struct irq_data *irq_data;
irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
irq_data_get_node(child));
if (irq_data) {
child->parent_data = irq_data;
irq_data->irq = child->irq;
irq_data->common = child->common;
irq_data->domain = domain;
}
return irq_data;
}
static void __irq_domain_free_hierarchy(struct irq_data *irq_data)
{
struct irq_data *tmp;
while (irq_data) {
tmp = irq_data;
irq_data = irq_data->parent_data;
kfree(tmp);
}
}
static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
{
struct irq_data *irq_data, *tmp;
int i;
for (i = 0; i < nr_irqs; i++) {
irq_data = irq_get_irq_data(virq + i);
tmp = irq_data->parent_data;
irq_data->parent_data = NULL;
irq_data->domain = NULL;
__irq_domain_free_hierarchy(tmp);
}
}
/**
* irq_domain_disconnect_hierarchy - Mark the first unused level of a hierarchy
* @domain: IRQ domain from which the hierarchy is to be disconnected
* @virq: IRQ number where the hierarchy is to be trimmed
*
* Marks the @virq level belonging to @domain as disconnected.
* Returns -EINVAL if @virq doesn't have a valid irq_data pointing
* to @domain.
*
* Its only use is to be able to trim levels of hierarchy that do not
* have any real meaning for this interrupt, and that the driver marks
* as such from its .alloc() callback.
*/
int irq_domain_disconnect_hierarchy(struct irq_domain *domain,
unsigned int virq)
{
struct irq_data *irqd;
irqd = irq_domain_get_irq_data(domain, virq);
if (!irqd)
return -EINVAL;
irqd->chip = ERR_PTR(-ENOTCONN);
return 0;
}
EXPORT_SYMBOL_GPL(irq_domain_disconnect_hierarchy);
static int irq_domain_trim_hierarchy(unsigned int virq)
{
struct irq_data *tail, *irqd, *irq_data;
irq_data = irq_get_irq_data(virq);
tail = NULL;
/* The first entry must have a valid irqchip */
if (IS_ERR_OR_NULL(irq_data->chip))
return -EINVAL;
/*
* Validate that the irq_data chain is sane in the presence of
* a hierarchy trimming marker.
*/
for (irqd = irq_data->parent_data; irqd; irq_data = irqd, irqd = irqd->parent_data) {
/* Can't have a valid irqchip after a trim marker */
if (irqd->chip && tail)
return -EINVAL;
/* Can't have an empty irqchip before a trim marker */
if (!irqd->chip && !tail)
return -EINVAL;
if (IS_ERR(irqd->chip)) {
/* Only -ENOTCONN is a valid trim marker */
if (PTR_ERR(irqd->chip) != -ENOTCONN)
return -EINVAL;
tail = irq_data;
}
}
/* No trim marker, nothing to do */
if (!tail)
return 0;
pr_info("IRQ%d: trimming hierarchy from %s\n",
virq, tail->parent_data->domain->name);
/* Sever the inner part of the hierarchy... */
irqd = tail;
tail = tail->parent_data;
irqd->parent_data = NULL;
__irq_domain_free_hierarchy(tail);
return 0;
}
static int irq_domain_alloc_irq_data(struct irq_domain *domain,
unsigned int virq, unsigned int nr_irqs)
{
struct irq_data *irq_data;
struct irq_domain *parent;
int i;
/* The outermost irq_data is embedded in struct irq_desc */
for (i = 0; i < nr_irqs; i++) {
irq_data = irq_get_irq_data(virq + i);
irq_data->domain = domain;
for (parent = domain->parent; parent; parent = parent->parent) {
irq_data = irq_domain_insert_irq_data(parent, irq_data);
if (!irq_data) {
irq_domain_free_irq_data(virq, i + 1);
return -ENOMEM;
}
}
}
return 0;
}
/**
* irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
* @domain: domain to match
* @virq: IRQ number to get irq_data
*/
struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
unsigned int virq)
{
struct irq_data *irq_data;
for (irq_data = irq_get_irq_data(virq); irq_data;
irq_data = irq_data->parent_data)
if (irq_data->domain == domain)
return irq_data;
return NULL;
}
EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
/**
* irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
* @domain: Interrupt domain to match
* @virq: IRQ number
* @hwirq: The hwirq number
* @chip: The associated interrupt chip
* @chip_data: The associated chip data
*/
int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
irq_hw_number_t hwirq,
const struct irq_chip *chip,
void *chip_data)
{
struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
if (!irq_data)
return -ENOENT;
irq_data->hwirq = hwirq;
irq_data->chip = (struct irq_chip *)(chip ? chip : &no_irq_chip);
irq_data->chip_data = chip_data;
return 0;
}
EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip);
/**
* irq_domain_set_info - Set the complete data for a @virq in @domain
* @domain: Interrupt domain to match
* @virq: IRQ number
* @hwirq: The hardware interrupt number
* @chip: The associated interrupt chip
* @chip_data: The associated interrupt chip data
* @handler: The interrupt flow handler
* @handler_data: The interrupt flow handler data
* @handler_name: The interrupt handler name
*/
void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
irq_hw_number_t hwirq, const struct irq_chip *chip,
void *chip_data, irq_flow_handler_t handler,
void *handler_data, const char *handler_name)
{
irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
__irq_set_handler(virq, handler, 0, handler_name);
irq_set_handler_data(virq, handler_data);
}
EXPORT_SYMBOL(irq_domain_set_info);
/**
* irq_domain_free_irqs_common - Clear irq_data and free the parent
* @domain: Interrupt domain to match
* @virq: IRQ number to start with
* @nr_irqs: The number of irqs to free
*/
void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs)
{
struct irq_data *irq_data;
int i;
for (i = 0; i < nr_irqs; i++) {
irq_data = irq_domain_get_irq_data(domain, virq + i);
if (irq_data)
irq_domain_reset_irq_data(irq_data);
}
irq_domain_free_irqs_parent(domain, virq, nr_irqs);
}
EXPORT_SYMBOL_GPL(irq_domain_free_irqs_common);
/**
* irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent
* @domain: Interrupt domain to match
* @virq: IRQ number to start with
* @nr_irqs: The number of irqs to free
*/
void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs)
{
int i;
for (i = 0; i < nr_irqs; i++) {
irq_set_handler_data(virq + i, NULL);
irq_set_handler(virq + i, NULL);
}
irq_domain_free_irqs_common(domain, virq, nr_irqs);
}
static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain,
unsigned int irq_base,
unsigned int nr_irqs)
{
unsigned int i;
if (!domain->ops->free)
return;
for (i = 0; i < nr_irqs; i++) {
if (irq_domain_get_irq_data(domain, irq_base + i))
domain->ops->free(domain, irq_base + i, 1);
}
}
int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,
unsigned int irq_base,
unsigned int nr_irqs, void *arg)
{
if (!domain->ops->alloc) {
pr_debug("domain->ops->alloc() is NULL\n");
return -ENOSYS;
}
return domain->ops->alloc(domain, irq_base, nr_irqs, arg);
}
static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
unsigned int nr_irqs, int node, void *arg,
bool realloc, const struct irq_affinity_desc *affinity)
{
int i, ret, virq;
if (realloc && irq_base >= 0) {
virq = irq_base;
} else {
virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node,
affinity);
if (virq < 0) {
pr_debug("cannot allocate IRQ(base %d, count %d)\n",
irq_base, nr_irqs);
return virq;
}
}
if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) {
pr_debug("cannot allocate memory for IRQ%d\n", virq);
ret = -ENOMEM;
goto out_free_desc;
}
ret = irq_domain_alloc_irqs_hierarchy(domain, virq, nr_irqs, arg);
if (ret < 0)
goto out_free_irq_data;
for (i = 0; i < nr_irqs; i++) {
ret = irq_domain_trim_hierarchy(virq + i);
if (ret)
goto out_free_irq_data;
}
for (i = 0; i < nr_irqs; i++)
irq_domain_insert_irq(virq + i);
return virq;
out_free_irq_data:
irq_domain_free_irq_data(virq, nr_irqs);
out_free_desc:
irq_free_descs(virq, nr_irqs);
return ret;
}
/**
* __irq_domain_alloc_irqs - Allocate IRQs from domain
* @domain: domain to allocate from
* @irq_base: allocate specified IRQ number if irq_base >= 0
* @nr_irqs: number of IRQs to allocate
* @node: NUMA node id for memory allocation
* @arg: domain specific argument
* @realloc: IRQ descriptors have already been allocated if true
* @affinity: Optional irq affinity mask for multiqueue devices
*
* Allocate IRQ numbers and initialized all data structures to support
* hierarchy IRQ domains.
* Parameter @realloc is mainly to support legacy IRQs.
* Returns error code or allocated IRQ number
*
* The whole process to setup an IRQ has been split into two steps.
* The first step, __irq_domain_alloc_irqs(), is to allocate IRQ
* descriptor and required hardware resources. The second step,
* irq_domain_activate_irq(), is to program the hardware with preallocated
* resources. In this way, it's easier to rollback when failing to
* allocate resources.
*/
int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
unsigned int nr_irqs, int node, void *arg,
bool realloc, const struct irq_affinity_desc *affinity)
{
int ret;
if (domain == NULL) {
domain = irq_default_domain;
if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
return -EINVAL;
}
mutex_lock(&domain->root->mutex);
ret = irq_domain_alloc_irqs_locked(domain, irq_base, nr_irqs, node, arg,
realloc, affinity);
mutex_unlock(&domain->root->mutex);
return ret;
}
EXPORT_SYMBOL_GPL(__irq_domain_alloc_irqs);
/* 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 __rcu **slot;
lockdep_assert_held(&d->domain->root->mutex);
if (irq_domain_is_nomap(d->domain))
return;
/* Fix up the revmap. */
if (d->hwirq < d->domain->revmap_size) {
/* Not using radix tree */
rcu_assign_pointer(d->domain->revmap[d->hwirq], d);
} else {
slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq);
if (slot)
radix_tree_replace_slot(&d->domain->revmap_tree, slot, d);
}
}
/**
* 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 *irq_data = irq_get_irq_data(virq);
struct irq_data *parent_irq_data;
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 (!irq_data)
return -EINVAL;
if (domain->parent != irq_data->domain)
return -EINVAL;
parent_irq_data = kzalloc_node(sizeof(*parent_irq_data), GFP_KERNEL,
irq_data_get_node(irq_data));
if (!parent_irq_data)
return -ENOMEM;
mutex_lock(&domain->root->mutex);
/* Copy the original irq_data. */
*parent_irq_data = *irq_data;
/*
* Overwrite the irq_data, which is embedded in struct irq_desc, with
* values for this domain.
*/
irq_data->parent_data = parent_irq_data;
irq_data->domain = domain;
irq_data->mask = 0;
irq_data->hwirq = 0;
irq_data->chip = NULL;
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. */
*irq_data = *parent_irq_data;
kfree(parent_irq_data);
goto error;
}
irq_domain_fix_revmap(parent_irq_data);
irq_domain_set_mapping(domain, irq_data->hwirq, irq_data);
error:
mutex_unlock(&domain->root->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 *irq_data = irq_get_irq_data(virq);
struct irq_data *parent_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 (!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(irq_data != tmp_irq_data))
return -EINVAL;
if (WARN_ON(irq_data->domain != domain))
return -EINVAL;
parent_irq_data = irq_data->parent_data;
if (WARN_ON(!parent_irq_data))
return -EINVAL;
mutex_lock(&domain->root->mutex);
irq_data->parent_data = NULL;
irq_domain_clear_mapping(domain, irq_data->hwirq);
irq_domain_free_irqs_hierarchy(domain, virq, 1);
/* Restore the original irq_data. */
*irq_data = *parent_irq_data;
irq_domain_fix_revmap(irq_data);
mutex_unlock(&domain->root->mutex);
kfree(parent_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
* @nr_irqs: number of IRQs to free
*/
void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
{
struct irq_data *data = irq_get_irq_data(virq);
struct irq_domain *domain;
int i;
if (WARN(!data || !data->domain || !data->domain->ops->free,
"NULL pointer, cannot free irq\n"))
return;
domain = data->domain;
mutex_lock(&domain->root->mutex);
for (i = 0; i < nr_irqs; i++)
irq_domain_remove_irq(virq + i);
irq_domain_free_irqs_hierarchy(domain, virq, nr_irqs);
mutex_unlock(&domain->root->mutex);
irq_domain_free_irq_data(virq, nr_irqs);
irq_free_descs(virq, nr_irqs);
}
static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq)
{
if (irq_domain_is_msi_device(domain))
msi_device_domain_free_wired(domain, virq);
else
irq_domain_free_irqs(virq, 1);
}
/**
* irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
* @domain: Domain below which interrupts must be allocated
* @irq_base: Base IRQ number
* @nr_irqs: Number of IRQs to allocate
* @arg: Allocation data (arch/domain specific)
*/
int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
unsigned int irq_base, unsigned int nr_irqs,
void *arg)
{
if (!domain->parent)
return -ENOSYS;
return irq_domain_alloc_irqs_hierarchy(domain->parent, irq_base,
nr_irqs, arg);
}
EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent);
/**
* irq_domain_free_irqs_parent - Free interrupts from parent domain
* @domain: Domain below which interrupts must be freed
* @irq_base: Base IRQ number
* @nr_irqs: Number of IRQs to free
*/
void irq_domain_free_irqs_parent(struct irq_domain *domain,
unsigned int irq_base, unsigned int nr_irqs)
{
if (!domain->parent)
return;
irq_domain_free_irqs_hierarchy(domain->parent, irq_base, nr_irqs);
}
EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
static void __irq_domain_deactivate_irq(struct irq_data *irq_data)
{
if (irq_data && irq_data->domain) {
struct irq_domain *domain = irq_data->domain;
if (domain->ops->deactivate)
domain->ops->deactivate(domain, irq_data);
if (irq_data->parent_data)
__irq_domain_deactivate_irq(irq_data->parent_data);
}
}
static int __irq_domain_activate_irq(struct irq_data *irqd, bool reserve)
{
int ret = 0;
if (irqd && irqd->domain) {
struct irq_domain *domain = irqd->domain;
if (irqd->parent_data)
ret = __irq_domain_activate_irq(irqd->parent_data,
reserve);
if (!ret && domain->ops->activate) {
ret = domain->ops->activate(domain, irqd, reserve);
/* Rollback in case of error */
if (ret && irqd->parent_data)
__irq_domain_deactivate_irq(irqd->parent_data);
}
}
return ret;
}
/**
* irq_domain_activate_irq - Call domain_ops->activate recursively to activate
* interrupt
* @irq_data: Outermost irq_data associated with interrupt
* @reserve: If set only reserve an interrupt vector instead of assigning one
*
* This is the second step to call domain_ops->activate to program interrupt
* controllers, so the interrupt could actually get delivered.
*/
int irq_domain_activate_irq(struct irq_data *irq_data, bool reserve)
{
int ret = 0;
if (!irqd_is_activated(irq_data))
ret = __irq_domain_activate_irq(irq_data, reserve);
if (!ret)
irqd_set_activated(irq_data);
return ret;
}
/**
* irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to
* deactivate interrupt
* @irq_data: outermost irq_data associated with interrupt
*
* It calls domain_ops->deactivate to program interrupt controllers to disable
* interrupt delivery.
*/
void irq_domain_deactivate_irq(struct irq_data *irq_data)
{
if (irqd_is_activated(irq_data)) {
__irq_domain_deactivate_irq(irq_data);
irqd_clr_activated(irq_data);
}
}
static void irq_domain_check_hierarchy(struct irq_domain *domain)
{
/* Hierarchy irq_domains must implement callback alloc() */
if (domain->ops->alloc)
domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
}
#else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
/**
* irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
* @domain: domain to match
* @virq: IRQ number to get irq_data
*/
struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
unsigned int virq)
{
struct irq_data *irq_data = irq_get_irq_data(virq);
return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
}
EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
/**
* irq_domain_set_info - Set the complete data for a @virq in @domain
* @domain: Interrupt domain to match
* @virq: IRQ number
* @hwirq: The hardware interrupt number
* @chip: The associated interrupt chip
* @chip_data: The associated interrupt chip data
* @handler: The interrupt flow handler
* @handler_data: The interrupt flow handler data
* @handler_name: The interrupt handler name
*/
void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
irq_hw_number_t hwirq, const struct irq_chip *chip,
void *chip_data, irq_flow_handler_t handler,
void *handler_data, const char *handler_name)
{
irq_set_chip_and_handler_name(virq, chip, handler, handler_name);
irq_set_chip_data(virq, chip_data);
irq_set_handler_data(virq, handler_data);
}
static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
unsigned int nr_irqs, int node, void *arg,
bool realloc, const struct irq_affinity_desc *affinity)
{
return -EINVAL;
}
static void irq_domain_check_hierarchy(struct irq_domain *domain) { }
static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq) { }
#endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
#include "internals.h"
static struct dentry *domain_dir;
static const struct irq_bit_descr irqdomain_flags[] = {
BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_HIERARCHY),
BIT_MASK_DESCR(IRQ_DOMAIN_NAME_ALLOCATED),
BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_IPI_PER_CPU),
BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_IPI_SINGLE),
BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_MSI),
BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_ISOLATED_MSI),
BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_NO_MAP),
BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_MSI_PARENT),
BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_MSI_DEVICE),
BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_NONCORE),
};
static void irq_domain_debug_show_one(struct seq_file *m, struct irq_domain *d, int ind)
{
seq_printf(m, "%*sname: %s\n", ind, "", d->name);
seq_printf(m, "%*ssize: %u\n", ind + 1, "", d->revmap_size);
seq_printf(m, "%*smapped: %u\n", ind + 1, "", d->mapcount);
seq_printf(m, "%*sflags: 0x%08x\n", ind +1 , "", d->flags);
irq_debug_show_bits(m, ind, d->flags, irqdomain_flags, ARRAY_SIZE(irqdomain_flags));
if (d->ops && d->ops->debug_show)
d->ops->debug_show(m, d, NULL, ind + 1);
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
if (!d->parent)
return;
seq_printf(m, "%*sparent: %s\n", ind + 1, "", d->parent->name);
irq_domain_debug_show_one(m, d->parent, ind + 4);
#endif
}
static int irq_domain_debug_show(struct seq_file *m, void *p)
{
struct irq_domain *d = m->private;
/* Default domain? Might be NULL */
if (!d) {
if (!irq_default_domain)
return 0;
d = irq_default_domain;
}
irq_domain_debug_show_one(m, d, 0);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(irq_domain_debug);
static void debugfs_add_domain_dir(struct irq_domain *d)
{
if (!d->name || !domain_dir)
return;
debugfs_create_file(d->name, 0444, domain_dir, d,
&irq_domain_debug_fops);
}
static void debugfs_remove_domain_dir(struct irq_domain *d)
{
debugfs_lookup_and_remove(d->name, domain_dir);
}
void __init irq_domain_debugfs_init(struct dentry *root)
{
struct irq_domain *d;
domain_dir = debugfs_create_dir("domains", root);
debugfs_create_file("default", 0444, domain_dir, NULL,
&irq_domain_debug_fops);
mutex_lock(&irq_domain_mutex);
list_for_each_entry(d, &irq_domain_list, link)
debugfs_add_domain_dir(d);
mutex_unlock(&irq_domain_mutex);
}
#endif
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