// SPDX-License-Identifier: GPL-2.0
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#define pr_fmt(fmt) "irq: " fmt
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#include <linux/acpi.h>
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#include <linux/debugfs.h>
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#include <linux/hardirq.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/irqdesc.h>
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#include <linux/irqdomain.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/topology.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#include <linux/fs.h>
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static LIST_HEAD(irq_domain_list);
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static DEFINE_MUTEX(irq_domain_mutex);
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static struct irq_domain *irq_default_domain;
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static void irq_domain_check_hierarchy(struct irq_domain *domain);
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struct irqchip_fwid {
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struct fwnode_handle fwnode;
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unsigned int type;
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char *name;
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phys_addr_t *pa;
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};
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#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
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static void debugfs_add_domain_dir(struct irq_domain *d);
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static void debugfs_remove_domain_dir(struct irq_domain *d);
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#else
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static inline void debugfs_add_domain_dir(struct irq_domain *d) { }
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static inline void debugfs_remove_domain_dir(struct irq_domain *d) { }
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#endif
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const struct fwnode_operations irqchip_fwnode_ops;
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EXPORT_SYMBOL_GPL(irqchip_fwnode_ops);
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/**
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* __irq_domain_alloc_fwnode - Allocate a fwnode_handle suitable for
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* identifying an irq domain
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* @type: Type of irqchip_fwnode. See linux/irqdomain.h
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* @id: Optional user provided id if name != NULL
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* @name: Optional user provided domain name
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* @pa: Optional user-provided physical address
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*
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* Allocate a struct irqchip_fwid, and return a poiner to the embedded
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* fwnode_handle (or NULL on failure).
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*
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* Note: The types IRQCHIP_FWNODE_NAMED and IRQCHIP_FWNODE_NAMED_ID are
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* solely to transport name information to irqdomain creation code. The
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* node is not stored. For other types the pointer is kept in the irq
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* domain struct.
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*/
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struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
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const char *name,
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phys_addr_t *pa)
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{
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struct irqchip_fwid *fwid;
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char *n;
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fwid = kzalloc(sizeof(*fwid), GFP_KERNEL);
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switch (type) {
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case IRQCHIP_FWNODE_NAMED:
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n = kasprintf(GFP_KERNEL, "%s", name);
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break;
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case IRQCHIP_FWNODE_NAMED_ID:
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n = kasprintf(GFP_KERNEL, "%s-%d", name, id);
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break;
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default:
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n = kasprintf(GFP_KERNEL, "irqchip@%pa", pa);
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break;
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}
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if (!fwid || !n) {
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kfree(fwid);
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kfree(n);
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return NULL;
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}
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fwid->type = type;
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fwid->name = n;
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fwid->pa = pa;
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fwnode_init(&fwid->fwnode, &irqchip_fwnode_ops);
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return &fwid->fwnode;
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}
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EXPORT_SYMBOL_GPL(__irq_domain_alloc_fwnode);
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/**
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* irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
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*
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* Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
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*/
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void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
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{
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struct irqchip_fwid *fwid;
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if (WARN_ON(!is_fwnode_irqchip(fwnode)))
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return;
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fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
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kfree(fwid->name);
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kfree(fwid);
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}
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EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
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/**
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* __irq_domain_add() - Allocate a new irq_domain data structure
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* @fwnode: firmware node for the interrupt controller
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* @size: Size of linear map; 0 for radix mapping only
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* @hwirq_max: Maximum number of interrupts supported by controller
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* @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no
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* direct mapping
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* @ops: domain callbacks
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* @host_data: Controller private data pointer
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*
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* Allocates and initializes an irq_domain structure.
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* Returns pointer to IRQ domain, or NULL on failure.
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*/
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struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
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irq_hw_number_t hwirq_max, int direct_max,
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const struct irq_domain_ops *ops,
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void *host_data)
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{
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struct irqchip_fwid *fwid;
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struct irq_domain *domain;
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static atomic_t unknown_domains;
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domain = kzalloc_node(sizeof(*domain) + (sizeof(unsigned int) * size),
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GFP_KERNEL, of_node_to_nid(to_of_node(fwnode)));
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if (!domain)
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return NULL;
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if (is_fwnode_irqchip(fwnode)) {
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fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
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switch (fwid->type) {
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case IRQCHIP_FWNODE_NAMED:
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case IRQCHIP_FWNODE_NAMED_ID:
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domain->fwnode = fwnode;
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domain->name = kstrdup(fwid->name, GFP_KERNEL);
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if (!domain->name) {
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kfree(domain);
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return NULL;
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}
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domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
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break;
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default:
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domain->fwnode = fwnode;
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domain->name = fwid->name;
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break;
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}
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} else if (is_of_node(fwnode) || is_acpi_device_node(fwnode) ||
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is_software_node(fwnode)) {
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char *name;
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/*
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* fwnode paths contain '/', which debugfs is legitimately
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* unhappy about. Replace them with ':', which does
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* the trick and is not as offensive as '\'...
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*/
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name = kasprintf(GFP_KERNEL, "%pfw", fwnode);
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if (!name) {
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kfree(domain);
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return NULL;
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}
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strreplace(name, '/', ':');
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domain->name = name;
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domain->fwnode = fwnode;
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domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
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}
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if (!domain->name) {
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if (fwnode)
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pr_err("Invalid fwnode type for irqdomain\n");
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domain->name = kasprintf(GFP_KERNEL, "unknown-%d",
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atomic_inc_return(&unknown_domains));
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if (!domain->name) {
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kfree(domain);
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return NULL;
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}
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domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
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}
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fwnode_handle_get(fwnode);
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fwnode_dev_initialized(fwnode, true);
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/* Fill structure */
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INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
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mutex_init(&domain->revmap_tree_mutex);
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domain->ops = ops;
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domain->host_data = host_data;
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domain->hwirq_max = hwirq_max;
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domain->revmap_size = size;
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domain->revmap_direct_max_irq = direct_max;
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irq_domain_check_hierarchy(domain);
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mutex_lock(&irq_domain_mutex);
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debugfs_add_domain_dir(domain);
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list_add(&domain->link, &irq_domain_list);
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mutex_unlock(&irq_domain_mutex);
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pr_debug("Added domain %s\n", domain->name);
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return domain;
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}
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EXPORT_SYMBOL_GPL(__irq_domain_add);
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/**
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* irq_domain_remove() - Remove an irq domain.
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* @domain: domain to remove
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*
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* This routine is used to remove an irq domain. The caller must ensure
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* that all mappings within the domain have been disposed of prior to
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* use, depending on the revmap type.
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*/
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void irq_domain_remove(struct irq_domain *domain)
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{
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mutex_lock(&irq_domain_mutex);
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debugfs_remove_domain_dir(domain);
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WARN_ON(!radix_tree_empty(&domain->revmap_tree));
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list_del(&domain->link);
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/*
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* If the going away domain is the default one, reset it.
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*/
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if (unlikely(irq_default_domain == domain))
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irq_set_default_host(NULL);
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mutex_unlock(&irq_domain_mutex);
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pr_debug("Removed domain %s\n", domain->name);
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fwnode_dev_initialized(domain->fwnode, false);
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fwnode_handle_put(domain->fwnode);
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if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
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kfree(domain->name);
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kfree(domain);
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}
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EXPORT_SYMBOL_GPL(irq_domain_remove);
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void irq_domain_update_bus_token(struct irq_domain *domain,
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enum irq_domain_bus_token bus_token)
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{
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char *name;
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if (domain->bus_token == bus_token)
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return;
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mutex_lock(&irq_domain_mutex);
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domain->bus_token = bus_token;
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name = kasprintf(GFP_KERNEL, "%s-%d", domain->name, bus_token);
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if (!name) {
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mutex_unlock(&irq_domain_mutex);
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return;
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}
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debugfs_remove_domain_dir(domain);
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if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
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kfree(domain->name);
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else
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domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
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domain->name = name;
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debugfs_add_domain_dir(domain);
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mutex_unlock(&irq_domain_mutex);
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}
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EXPORT_SYMBOL_GPL(irq_domain_update_bus_token);
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/**
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* irq_domain_add_simple() - Register an irq_domain and optionally map a range of irqs
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* @of_node: pointer to interrupt controller's device tree node.
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* @size: total number of irqs in mapping
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* @first_irq: first number of irq block assigned to the domain,
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* pass zero to assign irqs on-the-fly. If first_irq is non-zero, then
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* pre-map all of the irqs in the domain to virqs starting at first_irq.
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* @ops: domain callbacks
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* @host_data: Controller private data pointer
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*
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* Allocates an irq_domain, and optionally if first_irq is positive then also
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* allocate irq_descs and map all of the hwirqs to virqs starting at first_irq.
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*
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* This is intended to implement the expected behaviour for most
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* interrupt controllers. If device tree is used, then first_irq will be 0 and
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* irqs get mapped dynamically on the fly. However, if the controller requires
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* static virq assignments (non-DT boot) then it will set that up correctly.
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*/
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struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
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unsigned int size,
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unsigned int first_irq,
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const struct irq_domain_ops *ops,
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void *host_data)
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{
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struct irq_domain *domain;
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domain = __irq_domain_add(of_node_to_fwnode(of_node), size, size, 0, ops, host_data);
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if (!domain)
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return NULL;
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if (first_irq > 0) {
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if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
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/* attempt to allocated irq_descs */
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int rc = irq_alloc_descs(first_irq, first_irq, size,
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of_node_to_nid(of_node));
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if (rc < 0)
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pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
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first_irq);
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}
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irq_domain_associate_many(domain, first_irq, 0, size);
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}
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return domain;
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}
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EXPORT_SYMBOL_GPL(irq_domain_add_simple);
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/**
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* irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
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* @of_node: pointer to interrupt controller's device tree node.
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* @size: total number of irqs in legacy mapping
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* @first_irq: first number of irq block assigned to the domain
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* @first_hwirq: first hwirq number to use for the translation. Should normally
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* be '0', but a positive integer can be used if the effective
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* hwirqs numbering does not begin at zero.
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* @ops: map/unmap domain callbacks
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* @host_data: Controller private data pointer
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*
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* Note: the map() callback will be called before this function returns
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* for all legacy interrupts except 0 (which is always the invalid irq for
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* a legacy controller).
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*/
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struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
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unsigned int size,
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unsigned int first_irq,
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irq_hw_number_t first_hwirq,
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const struct irq_domain_ops *ops,
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void *host_data)
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{
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struct irq_domain *domain;
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domain = __irq_domain_add(of_node_to_fwnode(of_node), first_hwirq + size,
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first_hwirq + size, 0, ops, host_data);
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if (domain)
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irq_domain_associate_many(domain, first_irq, first_hwirq, size);
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return domain;
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}
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EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
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/**
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* irq_find_matching_fwspec() - Locates a domain for a given fwspec
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* @fwspec: FW specifier for an interrupt
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* @bus_token: domain-specific data
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*/
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struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
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enum irq_domain_bus_token bus_token)
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{
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struct irq_domain *h, *found = NULL;
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struct fwnode_handle *fwnode = fwspec->fwnode;
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int rc;
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/* We might want to match the legacy controller last since
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* it might potentially be set to match all interrupts in
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* the absence of a device node. This isn't a problem so far
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* yet though...
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*
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* bus_token == DOMAIN_BUS_ANY matches any domain, any other
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* values must generate an exact match for the domain to be
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* selected.
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*/
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mutex_lock(&irq_domain_mutex);
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list_for_each_entry(h, &irq_domain_list, link) {
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if (h->ops->select && fwspec->param_count)
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rc = h->ops->select(h, fwspec, bus_token);
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else if (h->ops->match)
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rc = h->ops->match(h, to_of_node(fwnode), bus_token);
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else
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rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
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((bus_token == DOMAIN_BUS_ANY) ||
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(h->bus_token == bus_token)));
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if (rc) {
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found = h;
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break;
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}
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}
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mutex_unlock(&irq_domain_mutex);
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return found;
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}
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EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
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/**
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* irq_domain_check_msi_remap - Check whether all MSI irq domains implement
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* IRQ remapping
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*
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* Return: false if any MSI irq domain does not support IRQ remapping,
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* true otherwise (including if there is no MSI irq domain)
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*/
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bool irq_domain_check_msi_remap(void)
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{
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struct irq_domain *h;
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bool ret = true;
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mutex_lock(&irq_domain_mutex);
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list_for_each_entry(h, &irq_domain_list, link) {
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if (irq_domain_is_msi(h) &&
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!irq_domain_hierarchical_is_msi_remap(h)) {
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ret = false;
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break;
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}
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}
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mutex_unlock(&irq_domain_mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(irq_domain_check_msi_remap);
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/**
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* irq_set_default_host() - Set a "default" irq domain
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* @domain: default domain pointer
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*
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* For convenience, it's possible to set a "default" domain that will be used
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* whenever NULL is passed to irq_create_mapping(). It makes life easier for
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* platforms that want to manipulate a few hard coded interrupt numbers that
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* aren't properly represented in the device-tree.
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*/
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void irq_set_default_host(struct irq_domain *domain)
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{
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pr_debug("Default domain set to @0x%p\n", domain);
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irq_default_domain = domain;
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}
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EXPORT_SYMBOL_GPL(irq_set_default_host);
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/**
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* irq_get_default_host() - Retrieve the "default" irq domain
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*
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* Returns: the default domain, if any.
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*
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* Modern code should never use this. This should only be used on
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* systems that cannot implement a firmware->fwnode mapping (which
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* both DT and ACPI provide).
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*/
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struct irq_domain *irq_get_default_host(void)
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{
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return irq_default_domain;
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}
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static void irq_domain_clear_mapping(struct irq_domain *domain,
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irq_hw_number_t hwirq)
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{
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if (hwirq < domain->revmap_size) {
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domain->linear_revmap[hwirq] = 0;
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} else {
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mutex_lock(&domain->revmap_tree_mutex);
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radix_tree_delete(&domain->revmap_tree, hwirq);
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mutex_unlock(&domain->revmap_tree_mutex);
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}
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}
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static void irq_domain_set_mapping(struct irq_domain *domain,
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irq_hw_number_t hwirq,
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struct irq_data *irq_data)
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{
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if (hwirq < domain->revmap_size) {
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domain->linear_revmap[hwirq] = irq_data->irq;
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} else {
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mutex_lock(&domain->revmap_tree_mutex);
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radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
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mutex_unlock(&domain->revmap_tree_mutex);
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}
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}
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void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
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{
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struct irq_data *irq_data = irq_get_irq_data(irq);
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irq_hw_number_t hwirq;
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if (WARN(!irq_data || irq_data->domain != domain,
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"virq%i doesn't exist; cannot disassociate\n", irq))
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return;
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hwirq = irq_data->hwirq;
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irq_set_status_flags(irq, IRQ_NOREQUEST);
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/* remove chip and handler */
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irq_set_chip_and_handler(irq, NULL, NULL);
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/* Make sure it's completed */
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synchronize_irq(irq);
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/* Tell the PIC about it */
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if (domain->ops->unmap)
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domain->ops->unmap(domain, irq);
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smp_mb();
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irq_data->domain = NULL;
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irq_data->hwirq = 0;
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domain->mapcount--;
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/* Clear reverse map for this hwirq */
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irq_domain_clear_mapping(domain, hwirq);
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}
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int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
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irq_hw_number_t hwirq)
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{
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struct irq_data *irq_data = irq_get_irq_data(virq);
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int ret;
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if (WARN(hwirq >= domain->hwirq_max,
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"error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
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return -EINVAL;
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if (WARN(!irq_data, "error: virq%i is not allocated", virq))
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return -EINVAL;
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if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
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return -EINVAL;
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mutex_lock(&irq_domain_mutex);
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irq_data->hwirq = hwirq;
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irq_data->domain = domain;
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if (domain->ops->map) {
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ret = domain->ops->map(domain, virq, hwirq);
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if (ret != 0) {
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/*
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* If map() returns -EPERM, this interrupt is protected
|
* by the firmware or some other service and shall not
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* be mapped. Don't bother telling the user about it.
|
*/
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if (ret != -EPERM) {
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pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
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domain->name, hwirq, virq, ret);
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}
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irq_data->domain = NULL;
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irq_data->hwirq = 0;
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mutex_unlock(&irq_domain_mutex);
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return ret;
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}
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/* If not already assigned, give the domain the chip's name */
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if (!domain->name && irq_data->chip)
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domain->name = irq_data->chip->name;
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}
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domain->mapcount++;
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irq_domain_set_mapping(domain, hwirq, irq_data);
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mutex_unlock(&irq_domain_mutex);
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irq_clear_status_flags(virq, IRQ_NOREQUEST);
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return 0;
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}
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EXPORT_SYMBOL_GPL(irq_domain_associate);
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void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
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irq_hw_number_t hwirq_base, int count)
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{
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struct device_node *of_node;
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int i;
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of_node = irq_domain_get_of_node(domain);
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pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
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of_node_full_name(of_node), irq_base, (int)hwirq_base, count);
|
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for (i = 0; i < count; i++) {
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irq_domain_associate(domain, irq_base + i, hwirq_base + i);
|
}
|
}
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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_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)
|
{
|
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),
|
affinity);
|
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_affinity);
|
|
/**
|
* 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 device_node *np, const u32 *args,
|
unsigned int count,
|
struct irq_fwspec *fwspec)
|
{
|
int i;
|
|
fwspec->fwnode = np ? &np->fwnode : NULL;
|
fwspec->param_count = count;
|
|
for (i = 0; i < count; i++)
|
fwspec->param[i] = args[i];
|
}
|
|
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;
|
|
/*
|
* If we've already configured this interrupt,
|
* don't do it again, or hell will break loose.
|
*/
|
virq = irq_find_mapping(domain, hwirq);
|
if (virq) {
|
/*
|
* If the trigger type is not specified or matches the
|
* current trigger type then we are done so return the
|
* interrupt number.
|
*/
|
if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
|
return virq;
|
|
/*
|
* If 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)
|
return 0;
|
|
irqd_set_trigger_type(irq_data, type);
|
return virq;
|
}
|
|
pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
|
hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
|
return 0;
|
}
|
|
if (irq_domain_is_hierarchy(domain)) {
|
virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, fwspec);
|
if (virq <= 0)
|
return 0;
|
} else {
|
/* Create mapping */
|
virq = irq_create_mapping(domain, hwirq);
|
if (!virq)
|
return virq;
|
}
|
|
irq_data = irq_get_irq_data(virq);
|
if (!irq_data) {
|
if (irq_domain_is_hierarchy(domain))
|
irq_domain_free_irqs(virq, 1);
|
else
|
irq_dispose_mapping(virq);
|
return 0;
|
}
|
|
/* Store trigger type */
|
irqd_set_trigger_type(irq_data, type);
|
|
return virq;
|
}
|
EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
|
|
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 = irq_get_irq_data(virq);
|
struct irq_domain *domain;
|
|
if (!virq || !irq_data)
|
return;
|
|
domain = irq_data->domain;
|
if (WARN_ON(domain == NULL))
|
return;
|
|
if (irq_domain_is_hierarchy(domain)) {
|
irq_domain_free_irqs(virq, 1);
|
} else {
|
irq_domain_disassociate(domain, virq);
|
irq_free_desc(virq);
|
}
|
}
|
EXPORT_SYMBOL_GPL(irq_dispose_mapping);
|
|
/**
|
* irq_find_mapping() - Find a linux irq from a 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);
|
|
/**
|
* 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)
|
{
|
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
|
*
|
* 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
|
*/
|
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
|
*
|
* 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 *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;
|
}
|
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);
|
|
/* 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;
|
|
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 (!irq_data->chip || IS_ERR(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, 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;
|
}
|
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, 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);
|
}
|
|
/**
|
* __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 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, const struct irq_affinity_desc *affinity)
|
{
|
int i, ret, virq;
|
|
if (domain == NULL) {
|
domain = irq_default_domain;
|
if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
|
return -EINVAL;
|
}
|
|
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;
|
}
|
|
mutex_lock(&irq_domain_mutex);
|
ret = irq_domain_alloc_irqs_hierarchy(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++) {
|
ret = irq_domain_trim_hierarchy(virq + i);
|
if (ret) {
|
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;
|
}
|
|
/* 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;
|
|
if (d->hwirq < d->domain->revmap_size)
|
return; /* Not using radix tree. */
|
|
/* Fix up the revmap. */
|
mutex_lock(&d->domain->revmap_tree_mutex);
|
slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq);
|
if (slot)
|
radix_tree_replace_slot(&d->domain->revmap_tree, slot, d);
|
mutex_unlock(&d->domain->revmap_tree_mutex);
|
}
|
|
/**
|
* irq_domain_push_irq() - Push a domain in to the top of a hierarchy.
|
* @domain: Domain to push.
|
* @virq: Irq to push the domain in to.
|
* @arg: Passed to the irq_domain_ops alloc() function.
|
*
|
* For an already existing irqdomain hierarchy, as might be obtained
|
* via a call to pci_enable_msix(), add an additional domain to the
|
* head of the processing chain. Must be called before request_irq()
|
* has been called.
|
*/
|
int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg)
|
{
|
struct irq_data *child_irq_data;
|
struct irq_data *root_irq_data = irq_get_irq_data(virq);
|
struct irq_desc *desc;
|
int rv = 0;
|
|
/*
|
* Check that no action has been set, which indicates the virq
|
* is in a state where this function doesn't have to deal with
|
* races between interrupt handling and maintaining the
|
* hierarchy. This will catch gross misuse. Attempting to
|
* make the check race free would require holding locks across
|
* calls to struct irq_domain_ops->alloc(), which could lead
|
* to deadlock, so we just do a simple check before starting.
|
*/
|
desc = irq_to_desc(virq);
|
if (!desc)
|
return -EINVAL;
|
if (WARN_ON(desc->action))
|
return -EBUSY;
|
|
if (domain == NULL)
|
return -EINVAL;
|
|
if (WARN_ON(!irq_domain_is_hierarchy(domain)))
|
return -EINVAL;
|
|
if (!root_irq_data)
|
return -EINVAL;
|
|
if (domain->parent != root_irq_data->domain)
|
return -EINVAL;
|
|
child_irq_data = kzalloc_node(sizeof(*child_irq_data), GFP_KERNEL,
|
irq_data_get_node(root_irq_data));
|
if (!child_irq_data)
|
return -ENOMEM;
|
|
mutex_lock(&irq_domain_mutex);
|
|
/* Copy the original irq_data. */
|
*child_irq_data = *root_irq_data;
|
|
/*
|
* Overwrite the root_irq_data, which is embedded in struct
|
* irq_desc, with values for this domain.
|
*/
|
root_irq_data->parent_data = child_irq_data;
|
root_irq_data->domain = domain;
|
root_irq_data->mask = 0;
|
root_irq_data->hwirq = 0;
|
root_irq_data->chip = NULL;
|
root_irq_data->chip_data = NULL;
|
|
/* May (probably does) set hwirq, chip, etc. */
|
rv = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);
|
if (rv) {
|
/* Restore the original irq_data. */
|
*root_irq_data = *child_irq_data;
|
kfree(child_irq_data);
|
goto error;
|
}
|
|
irq_domain_fix_revmap(child_irq_data);
|
irq_domain_set_mapping(domain, root_irq_data->hwirq, root_irq_data);
|
|
error:
|
mutex_unlock(&irq_domain_mutex);
|
|
return rv;
|
}
|
EXPORT_SYMBOL_GPL(irq_domain_push_irq);
|
|
/**
|
* irq_domain_pop_irq() - Remove a domain from the top of a hierarchy.
|
* @domain: Domain to remove.
|
* @virq: Irq to remove the domain from.
|
*
|
* Undo the effects of a call to irq_domain_push_irq(). Must be
|
* called either before request_irq() or after free_irq().
|
*/
|
int irq_domain_pop_irq(struct irq_domain *domain, int virq)
|
{
|
struct irq_data *root_irq_data = irq_get_irq_data(virq);
|
struct irq_data *child_irq_data;
|
struct irq_data *tmp_irq_data;
|
struct irq_desc *desc;
|
|
/*
|
* Check that no action is set, which indicates the virq is in
|
* a state where this function doesn't have to deal with races
|
* between interrupt handling and maintaining the hierarchy.
|
* This will catch gross misuse. Attempting to make the check
|
* race free would require holding locks across calls to
|
* struct irq_domain_ops->free(), which could lead to
|
* deadlock, so we just do a simple check before starting.
|
*/
|
desc = irq_to_desc(virq);
|
if (!desc)
|
return -EINVAL;
|
if (WARN_ON(desc->action))
|
return -EBUSY;
|
|
if (domain == NULL)
|
return -EINVAL;
|
|
if (!root_irq_data)
|
return -EINVAL;
|
|
tmp_irq_data = irq_domain_get_irq_data(domain, virq);
|
|
/* We can only "pop" if this domain is at the top of the list */
|
if (WARN_ON(root_irq_data != tmp_irq_data))
|
return -EINVAL;
|
|
if (WARN_ON(root_irq_data->domain != domain))
|
return -EINVAL;
|
|
child_irq_data = root_irq_data->parent_data;
|
if (WARN_ON(!child_irq_data))
|
return -EINVAL;
|
|
mutex_lock(&irq_domain_mutex);
|
|
root_irq_data->parent_data = NULL;
|
|
irq_domain_clear_mapping(domain, root_irq_data->hwirq);
|
irq_domain_free_irqs_hierarchy(domain, virq, 1);
|
|
/* Restore the original irq_data. */
|
*root_irq_data = *child_irq_data;
|
|
irq_domain_fix_revmap(root_irq_data);
|
|
mutex_unlock(&irq_domain_mutex);
|
|
kfree(child_irq_data);
|
|
return 0;
|
}
|
EXPORT_SYMBOL_GPL(irq_domain_pop_irq);
|
|
/**
|
* irq_domain_free_irqs - Free IRQ number and associated data structures
|
* @virq: base IRQ number
|
* @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_hierarchy(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)
|
{
|
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
|
* @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)
|
{
|
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;
|
}
|
|
/**
|
* irq_domain_hierarchical_is_msi_remap - Check if the domain or any
|
* parent has MSI remapping support
|
* @domain: domain pointer
|
*/
|
bool irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain)
|
{
|
for (; domain; domain = domain->parent) {
|
if (irq_domain_is_msi_remap(domain))
|
return true;
|
}
|
return false;
|
}
|
#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 */
|
|
#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
|
static struct dentry *domain_dir;
|
|
static void
|
irq_domain_debug_show_one(struct seq_file *m, struct irq_domain *d, int ind)
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{
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seq_printf(m, "%*sname: %s\n", ind, "", d->name);
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seq_printf(m, "%*ssize: %u\n", ind + 1, "",
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d->revmap_size + d->revmap_direct_max_irq);
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seq_printf(m, "%*smapped: %u\n", ind + 1, "", d->mapcount);
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seq_printf(m, "%*sflags: 0x%08x\n", ind +1 , "", d->flags);
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if (d->ops && d->ops->debug_show)
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d->ops->debug_show(m, d, NULL, ind + 1);
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#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
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if (!d->parent)
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return;
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seq_printf(m, "%*sparent: %s\n", ind + 1, "", d->parent->name);
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irq_domain_debug_show_one(m, d->parent, ind + 4);
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#endif
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}
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static int irq_domain_debug_show(struct seq_file *m, void *p)
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{
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struct irq_domain *d = m->private;
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/* Default domain? Might be NULL */
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if (!d) {
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if (!irq_default_domain)
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return 0;
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d = irq_default_domain;
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}
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irq_domain_debug_show_one(m, d, 0);
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(irq_domain_debug);
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static void debugfs_add_domain_dir(struct irq_domain *d)
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{
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if (!d->name || !domain_dir || d->debugfs_file)
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return;
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d->debugfs_file = debugfs_create_file(d->name, 0444, domain_dir, d,
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&irq_domain_debug_fops);
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}
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static void debugfs_remove_domain_dir(struct irq_domain *d)
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{
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debugfs_remove(d->debugfs_file);
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d->debugfs_file = NULL;
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}
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void __init irq_domain_debugfs_init(struct dentry *root)
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{
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struct irq_domain *d;
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domain_dir = debugfs_create_dir("domains", root);
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debugfs_create_file("default", 0444, domain_dir, NULL,
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&irq_domain_debug_fops);
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mutex_lock(&irq_domain_mutex);
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list_for_each_entry(d, &irq_domain_list, link)
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debugfs_add_domain_dir(d);
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mutex_unlock(&irq_domain_mutex);
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}
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#endif
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