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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // 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 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);
 
 /**
  * __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 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);
 
     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);
     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;
     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);
 }
 
 int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
              irq_hw_number_t hwirq)
 {
     struct irq_data *irq_data = irq_get_irq_data(virq);
     int ret;
 
     if (WARN(hwirq >= domain->hwirq_max,
          "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
         return -EINVAL;
     if (WARN(!irq_data, "error: virq%i is not allocated", virq))
         return -EINVAL;
     if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
         return -EINVAL;
 
     mutex_lock(&irq_domain_mutex);
     irq_data->hwirq = hwirq;
     irq_data->domain = domain;
     if (domain->ops->map) {
         ret = domain->ops->map(domain, virq, hwirq);
         if (ret != 0) {
             /*
              * If map() returns -EPERM, this interrupt is protected
              * by the firmware or some other service and shall not
              * be mapped. Don't bother telling the user about it.
              */
             if (ret != -EPERM) {
                 pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
                        domain->name, hwirq, virq, ret);
             }
             irq_data->domain = NULL;
             irq_data->hwirq = 0;
             mutex_unlock(&irq_domain_mutex);
             return ret;
         }
 
         /* If not already assigned, give the domain the chip's name */
         if (!domain->name && irq_data->chip)
             domain->name = irq_data->chip->name;
     }
 
     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);
 
 #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
 
 /**
  * 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;
 }
 
 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;
 
     /*
      * 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_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_linear(fwnode, size, ops, host_data);
     else
         domain = irq_domain_create_tree(fwnode, ops, host_data);
     if (domain) {
         domain->parent = parent;
         domain->flags |= flags;
     }
 
     return domain;
 }
 EXPORT_SYMBOL_GPL(irq_domain_create_hierarchy);
 
 static void irq_domain_insert_irq(int virq)
 {
     struct irq_data *data;
 
     for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
         struct irq_domain *domain = data->domain;
 
         domain->mapcount++;
         irq_domain_set_mapping(domain, data->hwirq, data);
 
         /* If not already assigned, give the domain the chip's name */
         if (!domain->name && data->chip)
             domain->name = data->chip->name;
     }
 
     irq_clear_status_flags(virq, IRQ_NOREQUEST);
 }
 
 static void irq_domain_remove_irq(int virq)
 {
     struct irq_data *data;
 
     irq_set_status_flags(virq, IRQ_NOREQUEST);
     irq_set_chip_and_handler(virq, NULL, NULL);
     synchronize_irq(virq);
     smp_mb();
 
     for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
         struct irq_domain *domain = data->domain;
         irq_hw_number_t hwirq = data->hwirq;
 
         domain->mapcount--;
         irq_domain_clear_mapping(domain, hwirq);
     }
 }
 
 static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
                            struct irq_data *child)
 {
     struct irq_data *irq_data;
 
     irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
                 irq_data_get_node(child));
     if (irq_data) {
         child->parent_data = irq_data;
         irq_data->irq = child->irq;
         irq_data->common = child->common;
         irq_data->domain = domain;
     }
 
     return irq_data;
 }
 
 static void __irq_domain_free_hierarchy(struct irq_data *irq_data)
 {
     struct irq_data *tmp;
 
     while (irq_data) {
         tmp = irq_data;
         irq_data = irq_data->parent_data;
         kfree(tmp);
     }
 }
 
 static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
 {
     struct irq_data *irq_data, *tmp;
     int i;
 
     for (i = 0; i < nr_irqs; i++) {
         irq_data = irq_get_irq_data(virq + i);
         tmp = irq_data->parent_data;
         irq_data->parent_data = NULL;
         irq_data->domain = NULL;
 
         __irq_domain_free_hierarchy(tmp);
     }
 }
 
 /**
  * irq_domain_disconnect_hierarchy - Mark the first unused level of a hierarchy
  * @domain: IRQ domain from which the hierarchy is to be disconnected
  * @virq:   IRQ number where the hierarchy is to be trimmed
  *
  * Marks the @virq level belonging to @domain as disconnected.
  * Returns -EINVAL if @virq doesn't have a valid irq_data pointing
  * to @domain.
  *
  * Its only use is to be able to trim levels of hierarchy that do not
  * have any real meaning for this interrupt, and that the driver marks
  * as such from its .alloc() callback.
  */
 int irq_domain_disconnect_hierarchy(struct irq_domain *domain,
                     unsigned int virq)
 {
     struct irq_data *irqd;
 
     irqd = irq_domain_get_irq_data(domain, virq);
     if (!irqd)
         return -EINVAL;
 
     irqd->chip = ERR_PTR(-ENOTCONN);
     return 0;
 }
 EXPORT_SYMBOL_GPL(irq_domain_disconnect_hierarchy);
 
 static int irq_domain_trim_hierarchy(unsigned int virq)
 {
     struct irq_data *tail, *irqd, *irq_data;
 
     irq_data = irq_get_irq_data(virq);
     tail = NULL;
 
     /* The first entry must have a valid irqchip */
     if (!irq_data->chip || IS_ERR(irq_data->chip))
         return -EINVAL;
 
     /*
      * Validate that the irq_data chain is sane in the presence of
      * a hierarchy trimming marker.
      */
     for (irqd = irq_data->parent_data; irqd; irq_data = irqd, irqd = irqd->parent_data) {
         /* Can't have a valid irqchip after a trim marker */
         if (irqd->chip && tail)
             return -EINVAL;
 
         /* Can't have an empty irqchip before a trim marker */
         if (!irqd->chip && !tail)
             return -EINVAL;
 
         if (IS_ERR(irqd->chip)) {
             /* Only -ENOTCONN is a valid trim marker */
             if (PTR_ERR(irqd->chip) != -ENOTCONN)
                 return -EINVAL;
 
             tail = irq_data;
         }
     }
 
     /* No trim marker, nothing to do */
     if (!tail)
         return 0;
 
     pr_info("IRQ%d: trimming hierarchy from %s\n",
         virq, tail->parent_data->domain->name);
 
     /* Sever the inner part of the hierarchy...  */
     irqd = tail;
     tail = tail->parent_data;
     irqd->parent_data = NULL;
     __irq_domain_free_hierarchy(tail);
 
     return 0;
 }
 
 static int irq_domain_alloc_irq_data(struct irq_domain *domain,
                      unsigned int virq, unsigned int nr_irqs)
 {
     struct irq_data *irq_data;
     struct irq_domain *parent;
     int i;
 
     /* The outermost irq_data is embedded in struct irq_desc */
     for (i = 0; i < nr_irqs; i++) {
         irq_data = irq_get_irq_data(virq + i);
         irq_data->domain = domain;
 
         for (parent = domain->parent; parent; parent = parent->parent) {
             irq_data = irq_domain_insert_irq_data(parent, irq_data);
             if (!irq_data) {
                 irq_domain_free_irq_data(virq, i + 1);
                 return -ENOMEM;
             }
         }
     }
 
     return 0;
 }
 
 /**
  * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
  * @domain: domain to match
  * @virq:   IRQ number to get irq_data
  */
 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
                      unsigned int virq)
 {
     struct irq_data *irq_data;
 
     for (irq_data = irq_get_irq_data(virq); irq_data;
          irq_data = irq_data->parent_data)
         if (irq_data->domain == domain)
             return irq_data;
 
     return NULL;
 }
 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
 
 /**
  * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
  * @domain: Interrupt domain to match
  * @virq:   IRQ number
  * @hwirq:  The hwirq number
  * @chip:   The associated interrupt chip
  * @chip_data:  The associated chip data
  */
 int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
                   irq_hw_number_t hwirq,
                   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);
 }
 
 /**
  * __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;
 }
 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 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_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

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