diff options
Diffstat (limited to 'kernel/irq/irqdomain.c')
| -rw-r--r-- | kernel/irq/irqdomain.c | 2009 |
1 files changed, 2009 insertions, 0 deletions
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c new file mode 100644 index 000000000..607c0c3d3 --- /dev/null +++ b/kernel/irq/irqdomain.c @@ -0,0 +1,2009 @@ +// SPDX-License-Identifier: GPL-2.0 + +#define pr_fmt(fmt) "irq: " fmt + +#include <linux/acpi.h> +#include <linux/debugfs.h> +#include <linux/hardirq.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/irqdesc.h> +#include <linux/irqdomain.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/topology.h> +#include <linux/seq_file.h> +#include <linux/slab.h> +#include <linux/smp.h> +#include <linux/fs.h> + +static LIST_HEAD(irq_domain_list); +static DEFINE_MUTEX(irq_domain_mutex); + +static struct irq_domain *irq_default_domain; + +static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base, + unsigned int nr_irqs, int node, void *arg, + bool realloc, const struct irq_affinity_desc *affinity); +static void irq_domain_check_hierarchy(struct irq_domain *domain); + +struct irqchip_fwid { + struct fwnode_handle fwnode; + unsigned int type; + char *name; + phys_addr_t *pa; +}; + +#ifdef CONFIG_GENERIC_IRQ_DEBUGFS +static void debugfs_add_domain_dir(struct irq_domain *d); +static void debugfs_remove_domain_dir(struct irq_domain *d); +#else +static inline void debugfs_add_domain_dir(struct irq_domain *d) { } +static inline void debugfs_remove_domain_dir(struct irq_domain *d) { } +#endif + +static const char *irqchip_fwnode_get_name(const struct fwnode_handle *fwnode) +{ + struct irqchip_fwid *fwid = container_of(fwnode, struct irqchip_fwid, fwnode); + + return fwid->name; +} + +const struct fwnode_operations irqchip_fwnode_ops = { + .get_name = irqchip_fwnode_get_name, +}; +EXPORT_SYMBOL_GPL(irqchip_fwnode_ops); + +/** + * __irq_domain_alloc_fwnode - Allocate a fwnode_handle suitable for + * identifying an irq domain + * @type: Type of irqchip_fwnode. See linux/irqdomain.h + * @id: Optional user provided id if name != NULL + * @name: Optional user provided domain name + * @pa: Optional user-provided physical address + * + * Allocate a struct irqchip_fwid, and return a pointer to the embedded + * fwnode_handle (or NULL on failure). + * + * Note: The types IRQCHIP_FWNODE_NAMED and IRQCHIP_FWNODE_NAMED_ID are + * solely to transport name information to irqdomain creation code. The + * node is not stored. For other types the pointer is kept in the irq + * domain struct. + */ +struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id, + const char *name, + phys_addr_t *pa) +{ + struct irqchip_fwid *fwid; + char *n; + + fwid = kzalloc(sizeof(*fwid), GFP_KERNEL); + + switch (type) { + case IRQCHIP_FWNODE_NAMED: + n = kasprintf(GFP_KERNEL, "%s", name); + break; + case IRQCHIP_FWNODE_NAMED_ID: + n = kasprintf(GFP_KERNEL, "%s-%d", name, id); + break; + default: + n = kasprintf(GFP_KERNEL, "irqchip@%pa", pa); + break; + } + + if (!fwid || !n) { + kfree(fwid); + kfree(n); + return NULL; + } + + fwid->type = type; + fwid->name = n; + fwid->pa = pa; + fwnode_init(&fwid->fwnode, &irqchip_fwnode_ops); + return &fwid->fwnode; +} +EXPORT_SYMBOL_GPL(__irq_domain_alloc_fwnode); + +/** + * irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle + * + * Free a fwnode_handle allocated with irq_domain_alloc_fwnode. + */ +void irq_domain_free_fwnode(struct fwnode_handle *fwnode) +{ + struct irqchip_fwid *fwid; + + if (WARN_ON(!is_fwnode_irqchip(fwnode))) + return; + + fwid = container_of(fwnode, struct irqchip_fwid, fwnode); + kfree(fwid->name); + kfree(fwid); +} +EXPORT_SYMBOL_GPL(irq_domain_free_fwnode); + +static struct irq_domain *__irq_domain_create(struct fwnode_handle *fwnode, + unsigned int size, + irq_hw_number_t hwirq_max, + int direct_max, + const struct irq_domain_ops *ops, + void *host_data) +{ + struct irqchip_fwid *fwid; + struct irq_domain *domain; + + static atomic_t unknown_domains; + + if (WARN_ON((size && direct_max) || + (!IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) && direct_max) || + (direct_max && (direct_max != hwirq_max)))) + return NULL; + + domain = kzalloc_node(struct_size(domain, revmap, size), + GFP_KERNEL, of_node_to_nid(to_of_node(fwnode))); + if (!domain) + return NULL; + + if (is_fwnode_irqchip(fwnode)) { + fwid = container_of(fwnode, struct irqchip_fwid, fwnode); + + switch (fwid->type) { + case IRQCHIP_FWNODE_NAMED: + case IRQCHIP_FWNODE_NAMED_ID: + domain->fwnode = fwnode; + domain->name = kstrdup(fwid->name, GFP_KERNEL); + if (!domain->name) { + kfree(domain); + return NULL; + } + domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED; + break; + default: + domain->fwnode = fwnode; + domain->name = fwid->name; + break; + } + } else if (is_of_node(fwnode) || is_acpi_device_node(fwnode) || + is_software_node(fwnode)) { + char *name; + + /* + * fwnode paths contain '/', which debugfs is legitimately + * unhappy about. Replace them with ':', which does + * the trick and is not as offensive as '\'... + */ + name = kasprintf(GFP_KERNEL, "%pfw", fwnode); + if (!name) { + kfree(domain); + return NULL; + } + + strreplace(name, '/', ':'); + + domain->name = name; + domain->fwnode = fwnode; + domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED; + } + + if (!domain->name) { + if (fwnode) + pr_err("Invalid fwnode type for irqdomain\n"); + domain->name = kasprintf(GFP_KERNEL, "unknown-%d", + atomic_inc_return(&unknown_domains)); + if (!domain->name) { + kfree(domain); + return NULL; + } + domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED; + } + + fwnode_handle_get(fwnode); + fwnode_dev_initialized(fwnode, true); + + /* Fill structure */ + INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL); + mutex_init(&domain->revmap_mutex); + domain->ops = ops; + domain->host_data = host_data; + domain->hwirq_max = hwirq_max; + + if (direct_max) { + domain->flags |= IRQ_DOMAIN_FLAG_NO_MAP; + } + + domain->revmap_size = size; + + irq_domain_check_hierarchy(domain); + + return domain; +} + +static void __irq_domain_publish(struct irq_domain *domain) +{ + mutex_lock(&irq_domain_mutex); + debugfs_add_domain_dir(domain); + list_add(&domain->link, &irq_domain_list); + mutex_unlock(&irq_domain_mutex); + + pr_debug("Added domain %s\n", domain->name); +} + +/** + * __irq_domain_add() - Allocate a new irq_domain data structure + * @fwnode: firmware node for the interrupt controller + * @size: Size of linear map; 0 for radix mapping only + * @hwirq_max: Maximum number of interrupts supported by controller + * @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no + * direct mapping + * @ops: domain callbacks + * @host_data: Controller private data pointer + * + * Allocates and initializes an irq_domain structure. + * Returns pointer to IRQ domain, or NULL on failure. + */ +struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, unsigned int size, + irq_hw_number_t hwirq_max, int direct_max, + const struct irq_domain_ops *ops, + void *host_data) +{ + struct irq_domain *domain; + + domain = __irq_domain_create(fwnode, size, hwirq_max, direct_max, + ops, host_data); + if (domain) + __irq_domain_publish(domain); + + return domain; +} +EXPORT_SYMBOL_GPL(__irq_domain_add); + +/** + * irq_domain_remove() - Remove an irq domain. + * @domain: domain to remove + * + * This routine is used to remove an irq domain. The caller must ensure + * that all mappings within the domain have been disposed of prior to + * use, depending on the revmap type. + */ +void irq_domain_remove(struct irq_domain *domain) +{ + mutex_lock(&irq_domain_mutex); + debugfs_remove_domain_dir(domain); + + WARN_ON(!radix_tree_empty(&domain->revmap_tree)); + + list_del(&domain->link); + + /* + * If the going away domain is the default one, reset it. + */ + if (unlikely(irq_default_domain == domain)) + irq_set_default_host(NULL); + + mutex_unlock(&irq_domain_mutex); + + pr_debug("Removed domain %s\n", domain->name); + + fwnode_dev_initialized(domain->fwnode, false); + fwnode_handle_put(domain->fwnode); + if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED) + kfree(domain->name); + kfree(domain); +} +EXPORT_SYMBOL_GPL(irq_domain_remove); + +void irq_domain_update_bus_token(struct irq_domain *domain, + enum irq_domain_bus_token bus_token) +{ + char *name; + + if (domain->bus_token == bus_token) + return; + + mutex_lock(&irq_domain_mutex); + + domain->bus_token = bus_token; + + name = kasprintf(GFP_KERNEL, "%s-%d", domain->name, bus_token); + if (!name) { + mutex_unlock(&irq_domain_mutex); + return; + } + + debugfs_remove_domain_dir(domain); + + if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED) + kfree(domain->name); + else + domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED; + + domain->name = name; + debugfs_add_domain_dir(domain); + + mutex_unlock(&irq_domain_mutex); +} +EXPORT_SYMBOL_GPL(irq_domain_update_bus_token); + +/** + * irq_domain_create_simple() - Register an irq_domain and optionally map a range of irqs + * @fwnode: firmware node for the interrupt controller + * @size: total number of irqs in mapping + * @first_irq: first number of irq block assigned to the domain, + * pass zero to assign irqs on-the-fly. If first_irq is non-zero, then + * pre-map all of the irqs in the domain to virqs starting at first_irq. + * @ops: domain callbacks + * @host_data: Controller private data pointer + * + * Allocates an irq_domain, and optionally if first_irq is positive then also + * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq. + * + * This is intended to implement the expected behaviour for most + * interrupt controllers. If device tree is used, then first_irq will be 0 and + * irqs get mapped dynamically on the fly. However, if the controller requires + * static virq assignments (non-DT boot) then it will set that up correctly. + */ +struct irq_domain *irq_domain_create_simple(struct fwnode_handle *fwnode, + unsigned int size, + unsigned int first_irq, + const struct irq_domain_ops *ops, + void *host_data) +{ + struct irq_domain *domain; + + domain = __irq_domain_add(fwnode, size, size, 0, ops, host_data); + if (!domain) + return NULL; + + if (first_irq > 0) { + if (IS_ENABLED(CONFIG_SPARSE_IRQ)) { + /* attempt to allocated irq_descs */ + int rc = irq_alloc_descs(first_irq, first_irq, size, + of_node_to_nid(to_of_node(fwnode))); + if (rc < 0) + pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n", + first_irq); + } + irq_domain_associate_many(domain, first_irq, 0, size); + } + + return domain; +} +EXPORT_SYMBOL_GPL(irq_domain_create_simple); + +/** + * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain. + * @of_node: pointer to interrupt controller's device tree node. + * @size: total number of irqs in legacy mapping + * @first_irq: first number of irq block assigned to the domain + * @first_hwirq: first hwirq number to use for the translation. Should normally + * be '0', but a positive integer can be used if the effective + * hwirqs numbering does not begin at zero. + * @ops: map/unmap domain callbacks + * @host_data: Controller private data pointer + * + * Note: the map() callback will be called before this function returns + * for all legacy interrupts except 0 (which is always the invalid irq for + * a legacy controller). + */ +struct irq_domain *irq_domain_add_legacy(struct device_node *of_node, + unsigned int size, + unsigned int first_irq, + irq_hw_number_t first_hwirq, + const struct irq_domain_ops *ops, + void *host_data) +{ + return irq_domain_create_legacy(of_node_to_fwnode(of_node), size, + first_irq, first_hwirq, ops, host_data); +} +EXPORT_SYMBOL_GPL(irq_domain_add_legacy); + +struct irq_domain *irq_domain_create_legacy(struct fwnode_handle *fwnode, + unsigned int size, + unsigned int first_irq, + irq_hw_number_t first_hwirq, + const struct irq_domain_ops *ops, + void *host_data) +{ + struct irq_domain *domain; + + domain = __irq_domain_add(fwnode, first_hwirq + size, first_hwirq + size, 0, ops, host_data); + if (domain) + irq_domain_associate_many(domain, first_irq, first_hwirq, size); + + return domain; +} +EXPORT_SYMBOL_GPL(irq_domain_create_legacy); + +/** + * irq_find_matching_fwspec() - Locates a domain for a given fwspec + * @fwspec: FW specifier for an interrupt + * @bus_token: domain-specific data + */ +struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec, + enum irq_domain_bus_token bus_token) +{ + struct irq_domain *h, *found = NULL; + struct fwnode_handle *fwnode = fwspec->fwnode; + int rc; + + /* We might want to match the legacy controller last since + * it might potentially be set to match all interrupts in + * the absence of a device node. This isn't a problem so far + * yet though... + * + * bus_token == DOMAIN_BUS_ANY matches any domain, any other + * values must generate an exact match for the domain to be + * selected. + */ + mutex_lock(&irq_domain_mutex); + list_for_each_entry(h, &irq_domain_list, link) { + if (h->ops->select && fwspec->param_count) + rc = h->ops->select(h, fwspec, bus_token); + else if (h->ops->match) + rc = h->ops->match(h, to_of_node(fwnode), bus_token); + else + rc = ((fwnode != NULL) && (h->fwnode == fwnode) && + ((bus_token == DOMAIN_BUS_ANY) || + (h->bus_token == bus_token))); + + if (rc) { + found = h; + break; + } + } + mutex_unlock(&irq_domain_mutex); + return found; +} +EXPORT_SYMBOL_GPL(irq_find_matching_fwspec); + +/** + * irq_domain_check_msi_remap - Check whether all MSI irq domains implement + * IRQ remapping + * + * Return: false if any MSI irq domain does not support IRQ remapping, + * true otherwise (including if there is no MSI irq domain) + */ +bool irq_domain_check_msi_remap(void) +{ + struct irq_domain *h; + bool ret = true; + + mutex_lock(&irq_domain_mutex); + list_for_each_entry(h, &irq_domain_list, link) { + if (irq_domain_is_msi(h) && + !irq_domain_hierarchical_is_msi_remap(h)) { + ret = false; + break; + } + } + mutex_unlock(&irq_domain_mutex); + return ret; +} +EXPORT_SYMBOL_GPL(irq_domain_check_msi_remap); + +/** + * irq_set_default_host() - Set a "default" irq domain + * @domain: default domain pointer + * + * For convenience, it's possible to set a "default" domain that will be used + * whenever NULL is passed to irq_create_mapping(). It makes life easier for + * platforms that want to manipulate a few hard coded interrupt numbers that + * aren't properly represented in the device-tree. + */ +void irq_set_default_host(struct irq_domain *domain) +{ + pr_debug("Default domain set to @0x%p\n", domain); + + irq_default_domain = domain; +} +EXPORT_SYMBOL_GPL(irq_set_default_host); + +/** + * irq_get_default_host() - Retrieve the "default" irq domain + * + * Returns: the default domain, if any. + * + * Modern code should never use this. This should only be used on + * systems that cannot implement a firmware->fwnode mapping (which + * both DT and ACPI provide). + */ +struct irq_domain *irq_get_default_host(void) +{ + return irq_default_domain; +} +EXPORT_SYMBOL_GPL(irq_get_default_host); + +static bool irq_domain_is_nomap(struct irq_domain *domain) +{ + return IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) && + (domain->flags & IRQ_DOMAIN_FLAG_NO_MAP); +} + +static void irq_domain_clear_mapping(struct irq_domain *domain, + irq_hw_number_t hwirq) +{ + if (irq_domain_is_nomap(domain)) + return; + + mutex_lock(&domain->revmap_mutex); + if (hwirq < domain->revmap_size) + rcu_assign_pointer(domain->revmap[hwirq], NULL); + else + radix_tree_delete(&domain->revmap_tree, hwirq); + mutex_unlock(&domain->revmap_mutex); +} + +static void irq_domain_set_mapping(struct irq_domain *domain, + irq_hw_number_t hwirq, + struct irq_data *irq_data) +{ + if (irq_domain_is_nomap(domain)) + return; + + mutex_lock(&domain->revmap_mutex); + if (hwirq < domain->revmap_size) + rcu_assign_pointer(domain->revmap[hwirq], irq_data); + else + radix_tree_insert(&domain->revmap_tree, hwirq, irq_data); + mutex_unlock(&domain->revmap_mutex); +} + +static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq) +{ + struct irq_data *irq_data = irq_get_irq_data(irq); + irq_hw_number_t hwirq; + + if (WARN(!irq_data || irq_data->domain != domain, + "virq%i doesn't exist; cannot disassociate\n", irq)) + return; + + hwirq = irq_data->hwirq; + + mutex_lock(&irq_domain_mutex); + + irq_set_status_flags(irq, IRQ_NOREQUEST); + + /* remove chip and handler */ + irq_set_chip_and_handler(irq, NULL, NULL); + + /* Make sure it's completed */ + synchronize_irq(irq); + + /* Tell the PIC about it */ + if (domain->ops->unmap) + domain->ops->unmap(domain, irq); + smp_mb(); + + irq_data->domain = NULL; + irq_data->hwirq = 0; + domain->mapcount--; + + /* Clear reverse map for this hwirq */ + irq_domain_clear_mapping(domain, hwirq); + + mutex_unlock(&irq_domain_mutex); +} + +static int irq_domain_associate_locked(struct irq_domain *domain, unsigned int virq, + irq_hw_number_t hwirq) +{ + struct irq_data *irq_data = irq_get_irq_data(virq); + int ret; + + if (WARN(hwirq >= domain->hwirq_max, + "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name)) + return -EINVAL; + if (WARN(!irq_data, "error: virq%i is not allocated", virq)) + return -EINVAL; + if (WARN(irq_data->domain, "error: virq%i is already associated", virq)) + return -EINVAL; + + irq_data->hwirq = hwirq; + irq_data->domain = domain; + if (domain->ops->map) { + ret = domain->ops->map(domain, virq, hwirq); + if (ret != 0) { + /* + * If map() returns -EPERM, this interrupt is protected + * by the firmware or some other service and shall not + * be mapped. Don't bother telling the user about it. + */ + if (ret != -EPERM) { + pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n", + domain->name, hwirq, virq, ret); + } + irq_data->domain = NULL; + irq_data->hwirq = 0; + return ret; + } + + /* 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); + + irq_clear_status_flags(virq, IRQ_NOREQUEST); + + return 0; +} + +int irq_domain_associate(struct irq_domain *domain, unsigned int virq, + irq_hw_number_t hwirq) +{ + int ret; + + mutex_lock(&irq_domain_mutex); + ret = irq_domain_associate_locked(domain, virq, hwirq); + mutex_unlock(&irq_domain_mutex); + + return ret; +} +EXPORT_SYMBOL_GPL(irq_domain_associate); + +void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base, + irq_hw_number_t hwirq_base, int count) +{ + struct device_node *of_node; + int i; + + of_node = irq_domain_get_of_node(domain); + pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__, + of_node_full_name(of_node), irq_base, (int)hwirq_base, count); + + for (i = 0; i < count; i++) { + irq_domain_associate(domain, irq_base + i, hwirq_base + i); + } +} +EXPORT_SYMBOL_GPL(irq_domain_associate_many); + +#ifdef CONFIG_IRQ_DOMAIN_NOMAP +/** + * irq_create_direct_mapping() - Allocate an irq for direct mapping + * @domain: domain to allocate the irq for or NULL for default domain + * + * This routine is used for irq controllers which can choose the hardware + * interrupt numbers they generate. In such a case it's simplest to use + * the linux irq as the hardware interrupt number. It still uses the linear + * or radix tree to store the mapping, but the irq controller can optimize + * the revmap path by using the hwirq directly. + */ +unsigned int irq_create_direct_mapping(struct irq_domain *domain) +{ + struct device_node *of_node; + unsigned int virq; + + if (domain == NULL) + domain = irq_default_domain; + + of_node = irq_domain_get_of_node(domain); + virq = irq_alloc_desc_from(1, of_node_to_nid(of_node)); + if (!virq) { + pr_debug("create_direct virq allocation failed\n"); + return 0; + } + if (virq >= domain->hwirq_max) { + pr_err("ERROR: no free irqs available below %lu maximum\n", + domain->hwirq_max); + irq_free_desc(virq); + return 0; + } + pr_debug("create_direct obtained virq %d\n", virq); + + if (irq_domain_associate(domain, virq, virq)) { + irq_free_desc(virq); + return 0; + } + + return virq; +} +EXPORT_SYMBOL_GPL(irq_create_direct_mapping); +#endif + +static unsigned int irq_create_mapping_affinity_locked(struct irq_domain *domain, + irq_hw_number_t hwirq, + const struct irq_affinity_desc *affinity) +{ + struct device_node *of_node = irq_domain_get_of_node(domain); + int virq; + + pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq); + + /* Allocate a virtual interrupt number */ + virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node), + affinity); + if (virq <= 0) { + pr_debug("-> virq allocation failed\n"); + return 0; + } + + if (irq_domain_associate_locked(domain, virq, hwirq)) { + irq_free_desc(virq); + return 0; + } + + pr_debug("irq %lu on domain %s mapped to virtual irq %u\n", + hwirq, of_node_full_name(of_node), virq); + + return virq; +} + +/** + * irq_create_mapping_affinity() - Map a hardware interrupt into linux irq space + * @domain: domain owning this hardware interrupt or NULL for default domain + * @hwirq: hardware irq number in that domain space + * @affinity: irq affinity + * + * Only one mapping per hardware interrupt is permitted. Returns a linux + * irq number. + * If the sense/trigger is to be specified, set_irq_type() should be called + * on the number returned from that call. + */ +unsigned int irq_create_mapping_affinity(struct irq_domain *domain, + irq_hw_number_t hwirq, + const struct irq_affinity_desc *affinity) +{ + int virq; + + /* Look for default domain if necessary */ + if (domain == NULL) + domain = irq_default_domain; + if (domain == NULL) { + WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq); + return 0; + } + + mutex_lock(&irq_domain_mutex); + + /* Check if mapping already exists */ + virq = irq_find_mapping(domain, hwirq); + if (virq) { + pr_debug("existing mapping on virq %d\n", virq); + goto out; + } + + virq = irq_create_mapping_affinity_locked(domain, hwirq, affinity); +out: + mutex_unlock(&irq_domain_mutex); + + return virq; +} +EXPORT_SYMBOL_GPL(irq_create_mapping_affinity); + +static int irq_domain_translate(struct irq_domain *d, + struct irq_fwspec *fwspec, + irq_hw_number_t *hwirq, unsigned int *type) +{ +#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY + if (d->ops->translate) + return d->ops->translate(d, fwspec, hwirq, type); +#endif + if (d->ops->xlate) + return d->ops->xlate(d, to_of_node(fwspec->fwnode), + fwspec->param, fwspec->param_count, + hwirq, type); + + /* If domain has no translation, then we assume interrupt line */ + *hwirq = fwspec->param[0]; + return 0; +} + +void of_phandle_args_to_fwspec(struct device_node *np, const u32 *args, + unsigned int count, struct irq_fwspec *fwspec) +{ + int i; + + fwspec->fwnode = of_node_to_fwnode(np); + fwspec->param_count = count; + + for (i = 0; i < count; i++) + fwspec->param[i] = args[i]; +} +EXPORT_SYMBOL_GPL(of_phandle_args_to_fwspec); + +unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec) +{ + struct irq_domain *domain; + struct irq_data *irq_data; + irq_hw_number_t hwirq; + unsigned int type = IRQ_TYPE_NONE; + int virq; + + if (fwspec->fwnode) { + domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED); + if (!domain) + domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY); + } else { + domain = irq_default_domain; + } + + if (!domain) { + pr_warn("no irq domain found for %s !\n", + of_node_full_name(to_of_node(fwspec->fwnode))); + return 0; + } + + if (irq_domain_translate(domain, fwspec, &hwirq, &type)) + return 0; + + /* + * WARN if the irqchip returns a type with bits + * outside the sense mask set and clear these bits. + */ + if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK)) + type &= IRQ_TYPE_SENSE_MASK; + + mutex_lock(&irq_domain_mutex); + + /* + * If we've already configured this interrupt, + * don't do it again, or hell will break loose. + */ + virq = irq_find_mapping(domain, hwirq); + if (virq) { + /* + * If the trigger type is not specified or matches the + * current trigger type then we are done so return the + * interrupt number. + */ + if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq)) + goto out; + + /* + * If the trigger type has not been set yet, then set + * it now and return the interrupt number. + */ + if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) { + irq_data = irq_get_irq_data(virq); + if (!irq_data) { + virq = 0; + goto out; + } + + irqd_set_trigger_type(irq_data, type); + goto out; + } + + pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n", + hwirq, of_node_full_name(to_of_node(fwspec->fwnode))); + virq = 0; + goto out; + } + + if (irq_domain_is_hierarchy(domain)) { + virq = irq_domain_alloc_irqs_locked(domain, -1, 1, NUMA_NO_NODE, + fwspec, false, NULL); + if (virq <= 0) { + virq = 0; + goto out; + } + } else { + /* Create mapping */ + virq = irq_create_mapping_affinity_locked(domain, hwirq, NULL); + if (!virq) + goto out; + } + + irq_data = irq_get_irq_data(virq); + if (WARN_ON(!irq_data)) { + virq = 0; + goto out; + } + + /* Store trigger type */ + irqd_set_trigger_type(irq_data, type); +out: + mutex_unlock(&irq_domain_mutex); + + return virq; +} +EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping); + +unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data) +{ + struct irq_fwspec fwspec; + + of_phandle_args_to_fwspec(irq_data->np, irq_data->args, + irq_data->args_count, &fwspec); + + return irq_create_fwspec_mapping(&fwspec); +} +EXPORT_SYMBOL_GPL(irq_create_of_mapping); + +/** + * irq_dispose_mapping() - Unmap an interrupt + * @virq: linux irq number of the interrupt to unmap + */ +void irq_dispose_mapping(unsigned int virq) +{ + struct irq_data *irq_data = 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_resolve_mapping() - Find a linux irq from a hw irq number. + * @domain: domain owning this hardware interrupt + * @hwirq: hardware irq number in that domain space + * @irq: optional pointer to return the Linux irq if required + * + * Returns the interrupt descriptor. + */ +struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain, + irq_hw_number_t hwirq, + unsigned int *irq) +{ + struct irq_desc *desc = NULL; + struct irq_data *data; + + /* Look for default domain if necessary */ + if (domain == NULL) + domain = irq_default_domain; + if (domain == NULL) + return desc; + + if (irq_domain_is_nomap(domain)) { + if (hwirq < domain->hwirq_max) { + data = irq_domain_get_irq_data(domain, hwirq); + if (data && data->hwirq == hwirq) + desc = irq_data_to_desc(data); + if (irq && desc) + *irq = hwirq; + } + + return desc; + } + + rcu_read_lock(); + /* Check if the hwirq is in the linear revmap. */ + if (hwirq < domain->revmap_size) + data = rcu_dereference(domain->revmap[hwirq]); + else + data = radix_tree_lookup(&domain->revmap_tree, hwirq); + + if (likely(data)) { + desc = irq_data_to_desc(data); + if (irq) + *irq = data->irq; + } + + rcu_read_unlock(); + return desc; +} +EXPORT_SYMBOL_GPL(__irq_resolve_mapping); + +/** + * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings + * + * 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(fwnode, size, size, 0, ops, host_data); + else + domain = __irq_domain_create(fwnode, 0, ~0, 0, ops, host_data); + + if (domain) { + domain->parent = parent; + domain->flags |= flags; + + __irq_domain_publish(domain); + } + + 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, + const struct irq_chip *chip, + void *chip_data) +{ + struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq); + + if (!irq_data) + return -ENOENT; + + irq_data->hwirq = hwirq; + irq_data->chip = (struct irq_chip *)(chip ? chip : &no_irq_chip); + irq_data->chip_data = chip_data; + + return 0; +} +EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip); + +/** + * irq_domain_set_info - Set the complete data for a @virq in @domain + * @domain: Interrupt domain to match + * @virq: IRQ number + * @hwirq: The hardware interrupt number + * @chip: The associated interrupt chip + * @chip_data: The associated interrupt chip data + * @handler: The interrupt flow handler + * @handler_data: The interrupt flow handler data + * @handler_name: The interrupt handler name + */ +void irq_domain_set_info(struct irq_domain *domain, unsigned int virq, + irq_hw_number_t hwirq, const struct irq_chip *chip, + void *chip_data, irq_flow_handler_t handler, + void *handler_data, const char *handler_name) +{ + irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data); + __irq_set_handler(virq, handler, 0, handler_name); + irq_set_handler_data(virq, handler_data); +} +EXPORT_SYMBOL(irq_domain_set_info); + +/** + * irq_domain_free_irqs_common - Clear irq_data and free the parent + * @domain: Interrupt domain to match + * @virq: IRQ number to start with + * @nr_irqs: The number of irqs to free + */ +void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs) +{ + struct irq_data *irq_data; + int i; + + for (i = 0; i < nr_irqs; i++) { + irq_data = irq_domain_get_irq_data(domain, virq + i); + if (irq_data) + irq_domain_reset_irq_data(irq_data); + } + irq_domain_free_irqs_parent(domain, virq, nr_irqs); +} +EXPORT_SYMBOL_GPL(irq_domain_free_irqs_common); + +/** + * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent + * @domain: Interrupt domain to match + * @virq: IRQ number to start with + * @nr_irqs: The number of irqs to free + */ +void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs) +{ + int i; + + for (i = 0; i < nr_irqs; i++) { + irq_set_handler_data(virq + i, NULL); + irq_set_handler(virq + i, NULL); + } + irq_domain_free_irqs_common(domain, virq, nr_irqs); +} + +static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain, + unsigned int irq_base, + unsigned int nr_irqs) +{ + unsigned int i; + + if (!domain->ops->free) + return; + + for (i = 0; i < nr_irqs; i++) { + if (irq_domain_get_irq_data(domain, irq_base + i)) + domain->ops->free(domain, irq_base + i, 1); + } +} + +int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain, + unsigned int irq_base, + unsigned int nr_irqs, void *arg) +{ + if (!domain->ops->alloc) { + pr_debug("domain->ops->alloc() is NULL\n"); + return -ENOSYS; + } + + return domain->ops->alloc(domain, irq_base, nr_irqs, arg); +} + +static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base, + unsigned int nr_irqs, int node, void *arg, + bool realloc, const struct irq_affinity_desc *affinity) +{ + int i, ret, virq; + + if (realloc && irq_base >= 0) { + virq = irq_base; + } else { + virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node, + affinity); + if (virq < 0) { + pr_debug("cannot allocate IRQ(base %d, count %d)\n", + irq_base, nr_irqs); + return virq; + } + } + + if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) { + pr_debug("cannot allocate memory for IRQ%d\n", virq); + ret = -ENOMEM; + goto out_free_desc; + } + + ret = irq_domain_alloc_irqs_hierarchy(domain, virq, nr_irqs, arg); + if (ret < 0) + goto out_free_irq_data; + + for (i = 0; i < nr_irqs; i++) { + ret = irq_domain_trim_hierarchy(virq + i); + if (ret) + goto out_free_irq_data; + } + + for (i = 0; i < nr_irqs; i++) + irq_domain_insert_irq(virq + i); + + return virq; + +out_free_irq_data: + irq_domain_free_irq_data(virq, nr_irqs); +out_free_desc: + irq_free_descs(virq, nr_irqs); + return ret; +} + +/** + * __irq_domain_alloc_irqs - Allocate IRQs from domain + * @domain: domain to allocate from + * @irq_base: allocate specified IRQ number if irq_base >= 0 + * @nr_irqs: number of IRQs to allocate + * @node: NUMA node id for memory allocation + * @arg: domain specific argument + * @realloc: IRQ descriptors have already been allocated if true + * @affinity: Optional irq affinity mask for multiqueue devices + * + * Allocate IRQ numbers and initialized all data structures to support + * hierarchy IRQ domains. + * Parameter @realloc is mainly to support legacy IRQs. + * Returns error code or allocated IRQ number + * + * The whole process to setup an IRQ has been split into two steps. + * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ + * descriptor and required hardware resources. The second step, + * irq_domain_activate_irq(), is to program the hardware with preallocated + * resources. In this way, it's easier to rollback when failing to + * allocate resources. + */ +int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base, + unsigned int nr_irqs, int node, void *arg, + bool realloc, const struct irq_affinity_desc *affinity) +{ + int ret; + + if (domain == NULL) { + domain = irq_default_domain; + if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n")) + return -EINVAL; + } + + mutex_lock(&irq_domain_mutex); + ret = irq_domain_alloc_irqs_locked(domain, irq_base, nr_irqs, node, arg, + realloc, affinity); + mutex_unlock(&irq_domain_mutex); + + return ret; +} +EXPORT_SYMBOL_GPL(__irq_domain_alloc_irqs); + +/* The irq_data was moved, fix the revmap to refer to the new location */ +static void irq_domain_fix_revmap(struct irq_data *d) +{ + void __rcu **slot; + + if (irq_domain_is_nomap(d->domain)) + return; + + /* Fix up the revmap. */ + mutex_lock(&d->domain->revmap_mutex); + if (d->hwirq < d->domain->revmap_size) { + /* Not using radix tree */ + rcu_assign_pointer(d->domain->revmap[d->hwirq], d); + } else { + slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq); + if (slot) + radix_tree_replace_slot(&d->domain->revmap_tree, slot, d); + } + mutex_unlock(&d->domain->revmap_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 + * @irq_base: Base IRQ number + * @nr_irqs: Number of IRQs to free + */ +void irq_domain_free_irqs_parent(struct irq_domain *domain, + unsigned int irq_base, unsigned int nr_irqs) +{ + if (!domain->parent) + return; + + irq_domain_free_irqs_hierarchy(domain->parent, irq_base, nr_irqs); +} +EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent); + +static void __irq_domain_deactivate_irq(struct irq_data *irq_data) +{ + if (irq_data && irq_data->domain) { + struct irq_domain *domain = irq_data->domain; + + if (domain->ops->deactivate) + domain->ops->deactivate(domain, irq_data); + if (irq_data->parent_data) + __irq_domain_deactivate_irq(irq_data->parent_data); + } +} + +static int __irq_domain_activate_irq(struct irq_data *irqd, bool reserve) +{ + int ret = 0; + + if (irqd && irqd->domain) { + struct irq_domain *domain = irqd->domain; + + if (irqd->parent_data) + ret = __irq_domain_activate_irq(irqd->parent_data, + reserve); + if (!ret && domain->ops->activate) { + ret = domain->ops->activate(domain, irqd, reserve); + /* Rollback in case of error */ + if (ret && irqd->parent_data) + __irq_domain_deactivate_irq(irqd->parent_data); + } + } + return ret; +} + +/** + * irq_domain_activate_irq - Call domain_ops->activate recursively to activate + * interrupt + * @irq_data: Outermost irq_data associated with interrupt + * @reserve: If set only reserve an interrupt vector instead of assigning one + * + * This is the second step to call domain_ops->activate to program interrupt + * controllers, so the interrupt could actually get delivered. + */ +int irq_domain_activate_irq(struct irq_data *irq_data, bool reserve) +{ + int ret = 0; + + if (!irqd_is_activated(irq_data)) + ret = __irq_domain_activate_irq(irq_data, reserve); + if (!ret) + irqd_set_activated(irq_data); + return ret; +} + +/** + * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to + * deactivate interrupt + * @irq_data: outermost irq_data associated with interrupt + * + * It calls domain_ops->deactivate to program interrupt controllers to disable + * interrupt delivery. + */ +void irq_domain_deactivate_irq(struct irq_data *irq_data) +{ + if (irqd_is_activated(irq_data)) { + __irq_domain_deactivate_irq(irq_data); + irqd_clr_activated(irq_data); + } +} + +static void irq_domain_check_hierarchy(struct irq_domain *domain) +{ + /* Hierarchy irq_domains must implement callback alloc() */ + if (domain->ops->alloc) + domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY; +} + +/** + * 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, const struct irq_chip *chip, + void *chip_data, irq_flow_handler_t handler, + void *handler_data, const char *handler_name) +{ + irq_set_chip_and_handler_name(virq, chip, handler, handler_name); + irq_set_chip_data(virq, chip_data); + irq_set_handler_data(virq, handler_data); +} + +static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base, + unsigned int nr_irqs, int node, void *arg, + bool realloc, const struct irq_affinity_desc *affinity) +{ + return -EINVAL; +} + +static void irq_domain_check_hierarchy(struct irq_domain *domain) +{ +} +#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); + 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_lookup_and_remove(d->name, domain_dir); +} + +void __init irq_domain_debugfs_init(struct dentry *root) +{ + struct irq_domain *d; + + domain_dir = debugfs_create_dir("domains", root); + + debugfs_create_file("default", 0444, domain_dir, NULL, + &irq_domain_debug_fops); + mutex_lock(&irq_domain_mutex); + list_for_each_entry(d, &irq_domain_list, link) + debugfs_add_domain_dir(d); + mutex_unlock(&irq_domain_mutex); +} +#endif |