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-rw-r--r--kernel/irq/irqdomain.c1978
1 files changed, 1978 insertions, 0 deletions
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
new file mode 100644
index 0000000000..0bdef4fe92
--- /dev/null
+++ b/kernel/irq/irqdomain.c
@@ -0,0 +1,1978 @@
+// 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 (!fwnode || 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;
+ }
+
+ domain->name = strreplace(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);
+ 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;
+
+ /*
+ * Hierarchical domains use the domain lock of the root domain
+ * (innermost domain).
+ *
+ * For non-hierarchical domains (as for root domains), the root
+ * pointer is set to the domain itself so that &domain->root->mutex
+ * always points to the right lock.
+ */
+ mutex_init(&domain->mutex);
+ domain->root = domain;
+
+ 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_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)
+{
+ lockdep_assert_held(&domain->root->mutex);
+
+ if (irq_domain_is_nomap(domain))
+ return;
+
+ if (hwirq < domain->revmap_size)
+ rcu_assign_pointer(domain->revmap[hwirq], NULL);
+ else
+ radix_tree_delete(&domain->revmap_tree, hwirq);
+}
+
+static void irq_domain_set_mapping(struct irq_domain *domain,
+ irq_hw_number_t hwirq,
+ struct irq_data *irq_data)
+{
+ /*
+ * This also makes sure that all domains point to the same root when
+ * called from irq_domain_insert_irq() for each domain in a hierarchy.
+ */
+ lockdep_assert_held(&domain->root->mutex);
+
+ if (irq_domain_is_nomap(domain))
+ return;
+
+ if (hwirq < domain->revmap_size)
+ rcu_assign_pointer(domain->revmap[hwirq], irq_data);
+ else
+ radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
+}
+
+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(&domain->root->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(&domain->root->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;
+ }
+ }
+
+ 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(&domain->root->mutex);
+ ret = irq_domain_associate_locked(domain, virq, hwirq);
+ mutex_unlock(&domain->root->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(&domain->root->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(&domain->root->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(&domain->root->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(&domain->root->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) {
+ if (parent)
+ domain->root = parent->root;
+ 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);
+ }
+
+ 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(&domain->root->mutex);
+ ret = irq_domain_alloc_irqs_locked(domain, irq_base, nr_irqs, node, arg,
+ realloc, affinity);
+ mutex_unlock(&domain->root->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;
+
+ lockdep_assert_held(&d->domain->root->mutex);
+
+ if (irq_domain_is_nomap(d->domain))
+ return;
+
+ /* Fix up the revmap. */
+ 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);
+ }
+}
+
+/**
+ * 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 *irq_data = irq_get_irq_data(virq);
+ struct irq_data *parent_irq_data;
+ 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 (!irq_data)
+ return -EINVAL;
+
+ if (domain->parent != irq_data->domain)
+ return -EINVAL;
+
+ parent_irq_data = kzalloc_node(sizeof(*parent_irq_data), GFP_KERNEL,
+ irq_data_get_node(irq_data));
+ if (!parent_irq_data)
+ return -ENOMEM;
+
+ mutex_lock(&domain->root->mutex);
+
+ /* Copy the original irq_data. */
+ *parent_irq_data = *irq_data;
+
+ /*
+ * Overwrite the irq_data, which is embedded in struct irq_desc, with
+ * values for this domain.
+ */
+ irq_data->parent_data = parent_irq_data;
+ irq_data->domain = domain;
+ irq_data->mask = 0;
+ irq_data->hwirq = 0;
+ irq_data->chip = NULL;
+ 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. */
+ *irq_data = *parent_irq_data;
+ kfree(parent_irq_data);
+ goto error;
+ }
+
+ irq_domain_fix_revmap(parent_irq_data);
+ irq_domain_set_mapping(domain, irq_data->hwirq, irq_data);
+error:
+ mutex_unlock(&domain->root->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 *irq_data = irq_get_irq_data(virq);
+ struct irq_data *parent_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 (!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(irq_data != tmp_irq_data))
+ return -EINVAL;
+
+ if (WARN_ON(irq_data->domain != domain))
+ return -EINVAL;
+
+ parent_irq_data = irq_data->parent_data;
+ if (WARN_ON(!parent_irq_data))
+ return -EINVAL;
+
+ mutex_lock(&domain->root->mutex);
+
+ irq_data->parent_data = NULL;
+
+ irq_domain_clear_mapping(domain, irq_data->hwirq);
+ irq_domain_free_irqs_hierarchy(domain, virq, 1);
+
+ /* Restore the original irq_data. */
+ *irq_data = *parent_irq_data;
+
+ irq_domain_fix_revmap(irq_data);
+
+ mutex_unlock(&domain->root->mutex);
+
+ kfree(parent_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);
+ struct irq_domain *domain;
+ int i;
+
+ if (WARN(!data || !data->domain || !data->domain->ops->free,
+ "NULL pointer, cannot free irq\n"))
+ return;
+
+ domain = data->domain;
+
+ mutex_lock(&domain->root->mutex);
+ for (i = 0; i < nr_irqs; i++)
+ irq_domain_remove_irq(virq + i);
+ irq_domain_free_irqs_hierarchy(domain, virq, nr_irqs);
+ mutex_unlock(&domain->root->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;
+}
+#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
+#include "internals.h"
+
+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