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1886 lines
51 KiB
1886 lines
51 KiB
// 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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static const char *irqchip_fwnode_get_name(const struct fwnode_handle *fwnode) |
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{ |
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struct irqchip_fwid *fwid = container_of(fwnode, struct irqchip_fwid, fwnode); |
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return fwid->name; |
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} |
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const struct fwnode_operations irqchip_fwnode_ops = { |
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.get_name = irqchip_fwnode_get_name, |
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}; |
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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 pointer 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_create_simple() - Register an irq_domain and optionally map a range of irqs |
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* @fwnode: firmware node for the interrupt controller |
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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_create_simple(struct fwnode_handle *fwnode, |
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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(fwnode, 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(to_of_node(fwnode))); |
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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_create_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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return irq_domain_create_legacy(of_node_to_fwnode(of_node), size, |
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first_irq, first_hwirq, ops, host_data); |
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} |
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EXPORT_SYMBOL_GPL(irq_domain_add_legacy); |
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struct irq_domain *irq_domain_create_legacy(struct fwnode_handle *fwnode, |
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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(fwnode, first_hwirq + size, 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_create_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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static 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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|
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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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|
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/* remove chip and handler */ |
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irq_set_chip_and_handler(irq, NULL, NULL); |
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|
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/* Make sure it's completed */ |
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synchronize_irq(irq); |
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|
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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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|
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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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|
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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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|
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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; |
|
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; |
|
} |
|
|
|
domain->mapcount++; |
|
irq_domain_set_mapping(domain, hwirq, irq_data); |
|
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_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 necessary */ |
|
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); |
|
|
|
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 = of_node_to_fwnode(np); |
|
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 necessary */ |
|
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; |
|
} |
|
|
|
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 the hardware with preallocated |
|
* resources. In this way, it's easier to rollback when failing to |
|
* allocate resources. |
|
*/ |
|
int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base, |
|
unsigned int nr_irqs, int node, void *arg, |
|
bool realloc, const struct irq_affinity_desc *affinity) |
|
{ |
|
int 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 |
|
* @domain: Domain below which interrupts must be allocated |
|
* @irq_base: Base IRQ number |
|
* @nr_irqs: Number of IRQs to allocate |
|
* @arg: Allocation data (arch/domain specific) |
|
*/ |
|
int irq_domain_alloc_irqs_parent(struct irq_domain *domain, |
|
unsigned int irq_base, unsigned int nr_irqs, |
|
void *arg) |
|
{ |
|
if (!domain->parent) |
|
return -ENOSYS; |
|
|
|
return irq_domain_alloc_irqs_hierarchy(domain->parent, irq_base, |
|
nr_irqs, arg); |
|
} |
|
EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent); |
|
|
|
/** |
|
* irq_domain_free_irqs_parent - Free interrupts from parent domain |
|
* @domain: Domain below which interrupts must be freed |
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* @irq_base: Base IRQ number |
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* @nr_irqs: Number of IRQs to free |
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*/ |
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void irq_domain_free_irqs_parent(struct irq_domain *domain, |
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unsigned int irq_base, unsigned int nr_irqs) |
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{ |
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if (!domain->parent) |
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return; |
|
|
|
irq_domain_free_irqs_hierarchy(domain->parent, irq_base, nr_irqs); |
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} |
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EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent); |
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|
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static void __irq_domain_deactivate_irq(struct irq_data *irq_data) |
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{ |
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if (irq_data && irq_data->domain) { |
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struct irq_domain *domain = irq_data->domain; |
|
|
|
if (domain->ops->deactivate) |
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domain->ops->deactivate(domain, irq_data); |
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if (irq_data->parent_data) |
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__irq_domain_deactivate_irq(irq_data->parent_data); |
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} |
|
} |
|
|
|
static int __irq_domain_activate_irq(struct irq_data *irqd, bool reserve) |
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{ |
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int ret = 0; |
|
|
|
if (irqd && irqd->domain) { |
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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) |
|
{ |
|
seq_printf(m, "%*sname: %s\n", ind, "", d->name); |
|
seq_printf(m, "%*ssize: %u\n", ind + 1, "", |
|
d->revmap_size + d->revmap_direct_max_irq); |
|
seq_printf(m, "%*smapped: %u\n", ind + 1, "", d->mapcount); |
|
seq_printf(m, "%*sflags: 0x%08x\n", ind +1 , "", d->flags); |
|
if (d->ops && d->ops->debug_show) |
|
d->ops->debug_show(m, d, NULL, ind + 1); |
|
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY |
|
if (!d->parent) |
|
return; |
|
seq_printf(m, "%*sparent: %s\n", ind + 1, "", d->parent->name); |
|
irq_domain_debug_show_one(m, d->parent, ind + 4); |
|
#endif |
|
} |
|
|
|
static int irq_domain_debug_show(struct seq_file *m, void *p) |
|
{ |
|
struct irq_domain *d = m->private; |
|
|
|
/* Default domain? Might be NULL */ |
|
if (!d) { |
|
if (!irq_default_domain) |
|
return 0; |
|
d = irq_default_domain; |
|
} |
|
irq_domain_debug_show_one(m, d, 0); |
|
return 0; |
|
} |
|
DEFINE_SHOW_ATTRIBUTE(irq_domain_debug); |
|
|
|
static void debugfs_add_domain_dir(struct irq_domain *d) |
|
{ |
|
if (!d->name || !domain_dir) |
|
return; |
|
debugfs_create_file(d->name, 0444, domain_dir, d, |
|
&irq_domain_debug_fops); |
|
} |
|
|
|
static void debugfs_remove_domain_dir(struct irq_domain *d) |
|
{ |
|
debugfs_remove(debugfs_lookup(d->name, domain_dir)); |
|
} |
|
|
|
void __init irq_domain_debugfs_init(struct dentry *root) |
|
{ |
|
struct irq_domain *d; |
|
|
|
domain_dir = debugfs_create_dir("domains", root); |
|
|
|
debugfs_create_file("default", 0444, domain_dir, NULL, |
|
&irq_domain_debug_fops); |
|
mutex_lock(&irq_domain_mutex); |
|
list_for_each_entry(d, &irq_domain_list, link) |
|
debugfs_add_domain_dir(d); |
|
mutex_unlock(&irq_domain_mutex); |
|
} |
|
#endif
|
|
|