Select Git revision
irqdomain.c
irqdomain.c 38.57 KiB
#define pr_fmt(fmt) "irq: " fmt
#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 DEFINE_MUTEX(revmap_trees_mutex);
static struct irq_domain *irq_default_domain;
static int irq_domain_alloc_descs(int virq, unsigned int nr_irqs,
irq_hw_number_t hwirq, int node);
static void irq_domain_check_hierarchy(struct irq_domain *domain);
struct irqchip_fwid {
struct fwnode_handle fwnode;
char *name;
void *data;
};
/**
* irq_domain_alloc_fwnode - Allocate a fwnode_handle suitable for
* identifying an irq domain
* @data: optional user-provided data
*
* Allocate a struct device_node, and return a poiner to the embedded
* fwnode_handle (or NULL on failure).
*/
struct fwnode_handle *irq_domain_alloc_fwnode(void *data)
{
struct irqchip_fwid *fwid;
char *name;
fwid = kzalloc(sizeof(*fwid), GFP_KERNEL);
name = kasprintf(GFP_KERNEL, "irqchip@%p", data);
if (!fwid || !name) {
kfree(fwid);
kfree(name);
return NULL;
}
fwid->name = name;
fwid->data = data;
fwid->fwnode.type = FWNODE_IRQCHIP;
return &fwid->fwnode;
}
EXPORT_SYMBOL_GPL(irq_domain_alloc_fwnode);
/**
* irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
*
* Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
*/
void irq_domain_free_fwnode(struct fwnode_handle *fwnode){
struct irqchip_fwid *fwid;
if (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);
/**
* __irq_domain_add() - Allocate a new irq_domain data structure
* @of_node: optional device-tree node of the interrupt controller
* @size: Size of linear map; 0 for radix mapping only
* @hwirq_max: Maximum number of interrupts supported by controller
* @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no
* direct mapping
* @ops: domain callbacks
* @host_data: Controller private data pointer
*
* Allocates and initialize and irq_domain structure.
* Returns pointer to IRQ domain, or NULL on failure.
*/
struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
irq_hw_number_t hwirq_max, int direct_max,
const struct irq_domain_ops *ops,
void *host_data)
{
struct irq_domain *domain;
struct device_node *of_node;
of_node = to_of_node(fwnode);
domain = kzalloc_node(sizeof(*domain) + (sizeof(unsigned int) * size),
GFP_KERNEL, of_node_to_nid(of_node));
if (WARN_ON(!domain))
return NULL;
of_node_get(of_node);
/* Fill structure */
INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
domain->ops = ops;
domain->host_data = host_data;
domain->fwnode = fwnode;
domain->hwirq_max = hwirq_max;
domain->revmap_size = size;
domain->revmap_direct_max_irq = direct_max;
irq_domain_check_hierarchy(domain);
mutex_lock(&irq_domain_mutex);
list_add(&domain->link, &irq_domain_list);
mutex_unlock(&irq_domain_mutex);
pr_debug("Added domain %s\n", domain->name);
return domain;
}
EXPORT_SYMBOL_GPL(__irq_domain_add);
/**
* 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){
mutex_lock(&irq_domain_mutex);
/*
* radix_tree_delete() takes care of destroying the root
* node when all entries are removed. Shout if there are
* any mappings left.
*/
WARN_ON(domain->revmap_tree.height);
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);
pr_debug("Removed domain %s\n", domain->name);
of_node_put(irq_domain_get_of_node(domain));
kfree(domain);
}
EXPORT_SYMBOL_GPL(irq_domain_remove);
/**
* irq_domain_add_simple() - Register an irq_domain and optionally map a range of irqs
* @of_node: pointer to interrupt controller's device tree node.
* @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_add_simple(struct device_node *of_node,
unsigned int size,
unsigned int first_irq,
const struct irq_domain_ops *ops,
void *host_data)
{
struct irq_domain *domain;
domain = __irq_domain_add(of_node_to_fwnode(of_node), size, size, 0, ops, host_data);
if (!domain)
return NULL;
if (first_irq > 0) {
if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
/* attempt to allocated irq_descs */
int rc = irq_alloc_descs(first_irq, first_irq, size,
of_node_to_nid(of_node));
if (rc < 0)
pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
first_irq);
}
irq_domain_associate_many(domain, first_irq, 0, size);
}
return domain;}
EXPORT_SYMBOL_GPL(irq_domain_add_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)
{
struct irq_domain *domain;
domain = __irq_domain_add(of_node_to_fwnode(of_node), first_hwirq + size,
first_hwirq + size, 0, ops, host_data);
if (domain)
irq_domain_associate_many(domain, first_irq, first_hwirq, size);
return domain;
}
EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
/**
* irq_find_matching_fwnode() - Locates a domain for a given fwnode
* @fwnode: FW descriptor of the interrupt controller
* @bus_token: domain-specific data
*/
struct irq_domain *irq_find_matching_fwnode(struct fwnode_handle *fwnode,
enum irq_domain_bus_token bus_token)
{
struct irq_domain *h, *found = NULL;
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->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_fwnode);
/**
* 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);
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;
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;
/* Clear reverse map for this hwirq */
if (hwirq < domain->revmap_size) {
domain->linear_revmap[hwirq] = 0;
} else {
mutex_lock(&revmap_trees_mutex);
radix_tree_delete(&domain->revmap_tree, hwirq);
mutex_unlock(&revmap_trees_mutex);
}
}
int irq_domain_associate(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;
mutex_lock(&irq_domain_mutex);
irq_data->hwirq = hwirq;
irq_data->domain = domain;
if (domain->ops->map) {
ret = domain->ops->map(domain, virq, hwirq);
if (ret != 0) {
/*
* If map() returns -EPERM, this interrupt is protected
* by the firmware or some other service and shall not
* be mapped. Don't bother telling the user about it.
*/
if (ret != -EPERM) {
pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
domain->name, hwirq, virq, ret);
}
irq_data->domain = NULL;
irq_data->hwirq = 0;
mutex_unlock(&irq_domain_mutex);
return ret;
}
/* If not already assigned, give the domain the chip's name */
if (!domain->name && irq_data->chip)
domain->name = irq_data->chip->name;
}
if (hwirq < domain->revmap_size) {
domain->linear_revmap[hwirq] = virq;
} else {
mutex_lock(&revmap_trees_mutex);
radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
mutex_unlock(&revmap_trees_mutex);
}
mutex_unlock(&irq_domain_mutex);
irq_clear_status_flags(virq, IRQ_NOREQUEST);
return 0;
}
EXPORT_SYMBOL_GPL(irq_domain_associate);
void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
irq_hw_number_t hwirq_base, int count)
{
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);
/**
* 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->revmap_direct_max_irq) {
pr_err("ERROR: no free irqs available below %i maximum\n",
domain->revmap_direct_max_irq);
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);
/**
* irq_create_mapping() - 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
*
* 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(struct irq_domain *domain,
irq_hw_number_t hwirq)
{
struct device_node *of_node;
int virq;
pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
/* Look for default domain if nececssary */
if (domain == NULL)
domain = irq_default_domain;
if (domain == NULL) {
WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
return 0;
}
pr_debug("-> using domain @%p\n", domain);
of_node = irq_domain_get_of_node(domain);
/* Check if mapping already exists */
virq = irq_find_mapping(domain, hwirq);
if (virq) {
pr_debug("-> existing mapping on virq %d\n", virq);
return virq;
}
/* Allocate a virtual interrupt number */
virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node));
if (virq <= 0) {
pr_debug("-> virq allocation failed\n"); return 0;
}
if (irq_domain_associate(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;
}
EXPORT_SYMBOL_GPL(irq_create_mapping);
/**
* irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs
* @domain: domain owning the interrupt range
* @irq_base: beginning of linux IRQ range
* @hwirq_base: beginning of hardware IRQ range
* @count: Number of interrupts to map
*
* This routine is used for allocating and mapping a range of hardware
* irqs to linux irqs where the linux irq numbers are at pre-defined
* locations. For use by controllers that already have static mappings
* to insert in to the domain.
*
* Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time
* domain insertion.
*
* 0 is returned upon success, while any failure to establish a static
* mapping is treated as an error.
*/
int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base,
irq_hw_number_t hwirq_base, int count)
{
struct device_node *of_node;
int ret;
of_node = irq_domain_get_of_node(domain);
ret = irq_alloc_descs(irq_base, irq_base, count,
of_node_to_nid(of_node));
if (unlikely(ret < 0))
return ret;
irq_domain_associate_many(domain, irq_base, hwirq_base, count);
return 0;
}
EXPORT_SYMBOL_GPL(irq_create_strict_mappings);
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;
}
static void of_phandle_args_to_fwspec(struct of_phandle_args *irq_data,
struct irq_fwspec *fwspec){
int i;
fwspec->fwnode = irq_data->np ? &irq_data->np->fwnode : NULL;
fwspec->param_count = irq_data->args_count;
for (i = 0; i < irq_data->args_count; i++)
fwspec->param[i] = irq_data->args[i];
}
unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
{
struct irq_domain *domain;
irq_hw_number_t hwirq;
unsigned int type = IRQ_TYPE_NONE;
int virq;
if (fwspec->fwnode) {
domain = irq_find_matching_fwnode(fwspec->fwnode,
DOMAIN_BUS_WIRED);
if (!domain)
domain = irq_find_matching_fwnode(fwspec->fwnode,
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;
if (irq_domain_is_hierarchy(domain)) {
/*
* 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)
return virq;
virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, fwspec);
if (virq <= 0)
return 0;
} else {
/* Create mapping */
virq = irq_create_mapping(domain, hwirq);
if (!virq)
return virq;
}
/* Set type if specified and different than the current one */
if (type != IRQ_TYPE_NONE &&
type != irq_get_trigger_type(virq))
irq_set_irq_type(virq, type);
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, &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 = irq_get_irq_data(virq);
struct irq_domain *domain;
if (!virq || !irq_data)
return;
domain = irq_data->domain;
if (WARN_ON(domain == NULL))
return;
irq_domain_disassociate(domain, virq);
irq_free_desc(virq);
}
EXPORT_SYMBOL_GPL(irq_dispose_mapping);
/**
* irq_find_mapping() - Find a linux irq from an hw irq number.
* @domain: domain owning this hardware interrupt
* @hwirq: hardware irq number in that domain space
*/
unsigned int irq_find_mapping(struct irq_domain *domain,
irq_hw_number_t hwirq)
{
struct irq_data *data;
/* Look for default domain if nececssary */
if (domain == NULL)
domain = irq_default_domain;
if (domain == NULL)
return 0;
if (hwirq < domain->revmap_direct_max_irq) {
data = irq_domain_get_irq_data(domain, hwirq);
if (data && data->hwirq == hwirq)
return hwirq;
}
/* Check if the hwirq is in the linear revmap. */
if (hwirq < domain->revmap_size)
return domain->linear_revmap[hwirq];
rcu_read_lock();
data = radix_tree_lookup(&domain->revmap_tree, hwirq);
rcu_read_unlock();
return data ? data->irq : 0;
}
EXPORT_SYMBOL_GPL(irq_find_mapping);
#ifdef CONFIG_IRQ_DOMAIN_DEBUG
static int virq_debug_show(struct seq_file *m, void *private)
{
unsigned long flags;
struct irq_desc *desc;
struct irq_domain *domain;
struct radix_tree_iter iter;
void *data, **slot;
int i;
seq_printf(m, " %-16s %-6s %-10s %-10s %s\n",
"name", "mapped", "linear-max", "direct-max", "devtree-node");
mutex_lock(&irq_domain_mutex);
list_for_each_entry(domain, &irq_domain_list, link) { struct device_node *of_node;
int count = 0;
of_node = irq_domain_get_of_node(domain);
radix_tree_for_each_slot(slot, &domain->revmap_tree, &iter, 0)
count++;
seq_printf(m, "%c%-16s %6u %10u %10u %s\n",
domain == irq_default_domain ? '*' : ' ', domain->name,
domain->revmap_size + count, domain->revmap_size,
domain->revmap_direct_max_irq,
of_node ? of_node_full_name(of_node) : "");
}
mutex_unlock(&irq_domain_mutex);
seq_printf(m, "%-5s %-7s %-15s %-*s %6s %-14s %s\n", "irq", "hwirq",
"chip name", (int)(2 * sizeof(void *) + 2), "chip data",
"active", "type", "domain");
for (i = 1; i < nr_irqs; i++) {
desc = irq_to_desc(i);
if (!desc)
continue;
raw_spin_lock_irqsave(&desc->lock, flags);
domain = desc->irq_data.domain;
if (domain) {
struct irq_chip *chip;
int hwirq = desc->irq_data.hwirq;
bool direct;
seq_printf(m, "%5d ", i);
seq_printf(m, "0x%05x ", hwirq);
chip = irq_desc_get_chip(desc);
seq_printf(m, "%-15s ", (chip && chip->name) ? chip->name : "none");
data = irq_desc_get_chip_data(desc);
seq_printf(m, data ? "0x%p " : " %p ", data);
seq_printf(m, " %c ", (desc->action && desc->action->handler) ? '*' : ' ');
direct = (i == hwirq) && (i < domain->revmap_direct_max_irq);
seq_printf(m, "%6s%-8s ",
(hwirq < domain->revmap_size) ? "LINEAR" : "RADIX",
direct ? "(DIRECT)" : "");
seq_printf(m, "%s\n", desc->irq_data.domain->name);
}
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("irq_domain_mapping", S_IRUGO, NULL,
NULL, &virq_debug_fops) == NULL)
return -ENOMEM;
return 0;
}
__initcall(irq_debugfs_init);
#endif /* CONFIG_IRQ_DOMAIN_DEBUG */
/**
* irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
*
* 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
*
* 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)
{
if (WARN_ON(intsize < 2))
return -EINVAL;
*out_hwirq = intspec[0];
*out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
return 0;
}
EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
/**
* irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
*
* 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];
*out_type = (intsize > 1) ? intspec[1] : 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);
static int irq_domain_alloc_descs(int virq, unsigned int cnt,
irq_hw_number_t hwirq, int node)
{
unsigned int hint;
if (virq >= 0) {
virq = irq_alloc_descs(virq, virq, cnt, node);
} else {
hint = hwirq % nr_irqs;
if (hint == 0)
hint++;
virq = irq_alloc_descs_from(hint, cnt, node);
if (virq <= 0 && hint > 1)
virq = irq_alloc_descs_from(1, cnt, node);
}
return virq;
}
#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 *domain;
if (size)
domain = irq_domain_create_linear(fwnode, size, ops, host_data);
else
domain = irq_domain_create_tree(fwnode, ops, host_data);
if (domain) {
domain->parent = parent;
domain->flags |= flags;
}
return domain;
}
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;
irq_hw_number_t hwirq = data->hwirq;
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);
}
/* If not already assigned, give the domain the chip's name */
if (!domain->name && data->chip)
domain->name = data->chip->name;
}
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;
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 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_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;
while (tmp) {
irq_data = tmp;
tmp = tmp->parent_data;
kfree(irq_data);
}
}
}
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, 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 = chip ? chip : &no_irq_chip;
irq_data->chip_data = chip_data;
return 0;
}
/**
* 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, 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_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;
}
/**
* 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);
}
/**
* 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 bool irq_domain_is_auto_recursive(struct irq_domain *domain){
return domain->flags & IRQ_DOMAIN_FLAG_AUTO_RECURSIVE;
}
static void irq_domain_free_irqs_recursive(struct irq_domain *domain,
unsigned int irq_base,
unsigned int nr_irqs)
{
domain->ops->free(domain, irq_base, nr_irqs);
if (irq_domain_is_auto_recursive(domain)) {
BUG_ON(!domain->parent);
irq_domain_free_irqs_recursive(domain->parent, irq_base,
nr_irqs);
}
}
int irq_domain_alloc_irqs_recursive(struct irq_domain *domain,
unsigned int irq_base,
unsigned int nr_irqs, void *arg)
{
int ret = 0;
struct irq_domain *parent = domain->parent;
bool recursive = irq_domain_is_auto_recursive(domain);
BUG_ON(recursive && !parent);
if (recursive)
ret = irq_domain_alloc_irqs_recursive(parent, irq_base,
nr_irqs, arg);
if (ret >= 0)
ret = domain->ops->alloc(domain, irq_base, nr_irqs, arg);
if (ret < 0 && recursive)
irq_domain_free_irqs_recursive(parent, irq_base, nr_irqs);
return ret;
}
/**
* __irq_domain_alloc_irqs - Allocate IRQs from domain
* @domain: domain to allocate from
* @irq_base: allocate specified IRQ nubmer 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
*
* 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 hardwares 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)
{
int i, ret, virq;
if (domain == NULL) {
domain = irq_default_domain;
if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
return -EINVAL;
}
if (!domain->ops->alloc) { pr_debug("domain->ops->alloc() is NULL\n");
return -ENOSYS;
}
if (realloc && irq_base >= 0) {
virq = irq_base;
} else {
virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node);
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;
}
mutex_lock(&irq_domain_mutex);
ret = irq_domain_alloc_irqs_recursive(domain, virq, nr_irqs, arg);
if (ret < 0) {
mutex_unlock(&irq_domain_mutex);
goto out_free_irq_data;
}
for (i = 0; i < nr_irqs; i++)
irq_domain_insert_irq(virq + i);
mutex_unlock(&irq_domain_mutex);
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_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);
int i;
if (WARN(!data || !data->domain || !data->domain->ops->free,
"NULL pointer, cannot free irq\n"))
return;
mutex_lock(&irq_domain_mutex);
for (i = 0; i < nr_irqs; i++)
irq_domain_remove_irq(virq + i);
irq_domain_free_irqs_recursive(data->domain, virq, nr_irqs);
mutex_unlock(&irq_domain_mutex);
irq_domain_free_irq_data(virq, nr_irqs);
irq_free_descs(virq, nr_irqs);
}
/**
* irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
* @irq_base: Base IRQ number
* @nr_irqs: Number of IRQs to allocate
* @arg: Allocation data (arch/domain specific)
* * Check whether the domain has been setup recursive. If not allocate
* through the parent domain.
*/
int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
unsigned int irq_base, unsigned int nr_irqs,
void *arg)
{
/* irq_domain_alloc_irqs_recursive() has called parent's alloc() */
if (irq_domain_is_auto_recursive(domain))
return 0;
domain = domain->parent;
if (domain)
return irq_domain_alloc_irqs_recursive(domain, irq_base,
nr_irqs, arg);
return -ENOSYS;
}
/**
* irq_domain_free_irqs_parent - Free interrupts from parent domain
* @irq_base: Base IRQ number
* @nr_irqs: Number of IRQs to free
*
* Check whether the domain has been setup recursive. If not free
* through the parent domain.
*/
void irq_domain_free_irqs_parent(struct irq_domain *domain,
unsigned int irq_base, unsigned int nr_irqs)
{
/* irq_domain_free_irqs_recursive() will call parent's free */
if (!irq_domain_is_auto_recursive(domain) && domain->parent)
irq_domain_free_irqs_recursive(domain->parent, irq_base,
nr_irqs);
}
/**
* irq_domain_activate_irq - Call domain_ops->activate recursively to activate
* interrupt
* @irq_data: outermost irq_data associated with interrupt
*
* This is the second step to call domain_ops->activate to program interrupt
* controllers, so the interrupt could actually get delivered.
*/
void irq_domain_activate_irq(struct irq_data *irq_data)
{
if (irq_data && irq_data->domain) {
struct irq_domain *domain = irq_data->domain;
if (irq_data->parent_data)
irq_domain_activate_irq(irq_data->parent_data);
if (domain->ops->activate)
domain->ops->activate(domain, irq_data);
}
}
/**
* 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 (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 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, 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 void irq_domain_check_hierarchy(struct irq_domain *domain)
{
}
#endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */