1 files changed, 716 insertions, 112 deletions

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 1f9e26526b69..3601f3fbf67c 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -1,189 +1,793 @@
+#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/seq_file.h>
 #include <linux/slab.h>
+#include <linux/smp.h>
+#include <linux/fs.h>
+
+#define IRQ_DOMAIN_MAP_LEGACY 0 /* driver allocated fixed range of irqs.
+                                 * ie. legacy 8259, gets irqs 1..15 */
+#define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */
+#define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */
+#define IRQ_DOMAIN_MAP_TREE 3 /* radix tree */
 
 static LIST_HEAD(irq_domain_list);
 static DEFINE_MUTEX(irq_domain_mutex);
 
+static DEFINE_MUTEX(revmap_trees_mutex);
+static unsigned int irq_virq_count = NR_IRQS;
+static struct irq_domain *irq_default_domain;
+
 /**
- * irq_domain_add() - Register an irq_domain
- * @domain: ptr to initialized irq_domain structure
+ * irq_domain_alloc() - Allocate a new irq_domain data structure
+ * @of_node: optional device-tree node of the interrupt controller
+ * @revmap_type: type of reverse mapping to use
+ * @ops: map/unmap domain callbacks
+ * @host_data: Controller private data pointer
  *
- * Registers an irq_domain structure.  The irq_domain must at a minimum be
- * initialized with an ops structure pointer, and either a ->to_irq hook or
- * a valid irq_base value.  Everything else is optional.
+ * Allocates and initialize and irq_domain structure.  Caller is expected to
+ * register allocated irq_domain with irq_domain_register().  Returns pointer
+ * to IRQ domain, or NULL on failure.
  */
-void irq_domain_add(struct irq_domain *domain)
+static struct irq_domain *irq_domain_alloc(struct device_node *of_node,
+                                           unsigned int revmap_type,
+                                           const struct irq_domain_ops *ops,
+                                           void *host_data)
 {
-        struct irq_data *d;
-        int hwirq, irq;
+        struct irq_domain *domain;
 
-        /*
-         * This assumes that the irq_domain owner has already allocated
-         * the irq_descs.  This block will be removed when support for dynamic
-         * allocation of irq_descs is added to irq_domain.
-         */
-        irq_domain_for_each_irq(domain, hwirq, irq) {
-                d = irq_get_irq_data(irq);
-                if (!d) {
-                        WARN(1, "error: assigning domain to non existant irq_desc");
-                        return;
-                }
-                if (d->domain) {
-                        /* things are broken; just report, don't clean up */
-                        WARN(1, "error: irq_desc already assigned to a domain");
-                        return;
+        domain = kzalloc(sizeof(*domain), GFP_KERNEL);
+        if (WARN_ON(!domain))
+                return NULL;
+
+        /* Fill structure */
+        domain->revmap_type = revmap_type;
+        domain->ops = ops;
+        domain->host_data = host_data;
+        domain->of_node = of_node_get(of_node);
+
+        return domain;
+}
+
+static void irq_domain_add(struct irq_domain *domain)
+{
+        mutex_lock(&irq_domain_mutex);
+        list_add(&domain->link, &irq_domain_list);
+        mutex_unlock(&irq_domain_mutex);
+        pr_debug("irq: Allocated domain of type %d @0x%p\n",
+                 domain->revmap_type, domain);
+}
+
+static unsigned int irq_domain_legacy_revmap(struct irq_domain *domain,
+                                             irq_hw_number_t hwirq)
+{
+        irq_hw_number_t first_hwirq = domain->revmap_data.legacy.first_hwirq;
+        int size = domain->revmap_data.legacy.size;
+
+        if (WARN_ON(hwirq < first_hwirq || hwirq >= first_hwirq + size))
+                return 0;
+        return hwirq - first_hwirq + domain->revmap_data.legacy.first_irq;
+}
+
+/**
+ * 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)
+{
+        struct irq_domain *domain;
+        unsigned int i;
+
+        domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LEGACY, ops, host_data);
+        if (!domain)
+                return NULL;
+
+        domain->revmap_data.legacy.first_irq = first_irq;
+        domain->revmap_data.legacy.first_hwirq = first_hwirq;
+        domain->revmap_data.legacy.size = size;
+
+        mutex_lock(&irq_domain_mutex);
+        /* Verify that all the irqs are available */
+        for (i = 0; i < size; i++) {
+                int irq = first_irq + i;
+                struct irq_data *irq_data = irq_get_irq_data(irq);
+
+                if (WARN_ON(!irq_data || irq_data->domain)) {
+                        mutex_unlock(&irq_domain_mutex);
+                        of_node_put(domain->of_node);
+                        kfree(domain);
+                        return NULL;
                 }
-                d->domain = domain;
-                d->hwirq = hwirq;
         }
 
-        mutex_lock(&irq_domain_mutex);
-        list_add(&domain->list, &irq_domain_list);
+        /* Claim all of the irqs before registering a legacy domain */
+        for (i = 0; i < size; i++) {
+                struct irq_data *irq_data = irq_get_irq_data(first_irq + i);
+                irq_data->hwirq = first_hwirq + i;
+                irq_data->domain = domain;
+        }
         mutex_unlock(&irq_domain_mutex);
+
+        for (i = 0; i < size; i++) {
+                int irq = first_irq + i;
+                int hwirq = first_hwirq + i;
+
+                /* IRQ0 gets ignored */
+                if (!irq)
+                        continue;
+
+                /* Legacy flags are left to default at this point,
+                 * one can then use irq_create_mapping() to
+                 * explicitly change them
+                 */
+                ops->map(domain, irq, hwirq);
+
+                /* Clear norequest flags */
+                irq_clear_status_flags(irq, IRQ_NOREQUEST);
+        }
+
+        irq_domain_add(domain);
+        return domain;
+}
+
+/**
+ * irq_domain_add_linear() - Allocate and register a legacy revmap irq_domain.
+ * @of_node: pointer to interrupt controller's device tree node.
+ * @ops: map/unmap domain callbacks
+ * @host_data: Controller private data pointer
+ */
+struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
+                                         unsigned int size,
+                                         const struct irq_domain_ops *ops,
+                                         void *host_data)
+{
+        struct irq_domain *domain;
+        unsigned int *revmap;
+
+        revmap = kzalloc(sizeof(*revmap) * size, GFP_KERNEL);
+        if (WARN_ON(!revmap))
+                return NULL;
+
+        domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LINEAR, ops, host_data);
+        if (!domain) {
+                kfree(revmap);
+                return NULL;
+        }
+        domain->revmap_data.linear.size = size;
+        domain->revmap_data.linear.revmap = revmap;
+        irq_domain_add(domain);
+        return domain;
+}
+
+struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
+                                         const struct irq_domain_ops *ops,
+                                         void *host_data)
+{
+        struct irq_domain *domain = irq_domain_alloc(of_node,
+                                        IRQ_DOMAIN_MAP_NOMAP, ops, host_data);
+        if (domain)
+                irq_domain_add(domain);
+        return domain;
+}
+
+/**
+ * irq_domain_add_tree()
+ * @of_node: pointer to interrupt controller's device tree node.
+ * @ops: map/unmap domain callbacks
+ *
+ * Note: The radix tree will be allocated later during boot automatically
+ * (the reverse mapping will use the slow path until that happens).
+ */
+struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
+                                         const struct irq_domain_ops *ops,
+                                         void *host_data)
+{
+        struct irq_domain *domain = irq_domain_alloc(of_node,
+                                        IRQ_DOMAIN_MAP_TREE, ops, host_data);
+        if (domain) {
+                INIT_RADIX_TREE(&domain->revmap_data.tree, GFP_KERNEL);
+                irq_domain_add(domain);
+        }
+        return domain;
 }
 
 /**
- * irq_domain_del() - Unregister an irq_domain
- * @domain: ptr to registered irq_domain.
+ * irq_find_host() - Locates a domain for a given device node
+ * @node: device-tree node of the interrupt controller
  */
-void irq_domain_del(struct irq_domain *domain)
+struct irq_domain *irq_find_host(struct device_node *node)
 {
-        struct irq_data *d;
-        int hwirq, irq;
+        struct irq_domain *h, *found = NULL;
+        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...
+         */
         mutex_lock(&irq_domain_mutex);
-        list_del(&domain->list);
+        list_for_each_entry(h, &irq_domain_list, link) {
+                if (h->ops->match)
+                        rc = h->ops->match(h, node);
+                else
+                        rc = (h->of_node != NULL) && (h->of_node == node);
+
+                if (rc) {
+                        found = h;
+                        break;
+                }
+        }
         mutex_unlock(&irq_domain_mutex);
+        return found;
+}
+EXPORT_SYMBOL_GPL(irq_find_host);
+
+/**
+ * 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("irq: Default domain set to @0x%p\n", domain);
+
+        irq_default_domain = domain;
+}
+
+/**
+ * irq_set_virq_count() - Set the maximum number of linux irqs
+ * @count: number of linux irqs, capped with NR_IRQS
+ *
+ * This is mainly for use by platforms like iSeries who want to program
+ * the virtual irq number in the controller to avoid the reverse mapping
+ */
+void irq_set_virq_count(unsigned int count)
+{
+        pr_debug("irq: Trying to set virq count to %d\n", count);
 
-        /* Clear the irq_domain assignments */
-        irq_domain_for_each_irq(domain, hwirq, irq) {
-                d = irq_get_irq_data(irq);
-                d->domain = NULL;
+        BUG_ON(count < NUM_ISA_INTERRUPTS);
+        if (count < NR_IRQS)
+                irq_virq_count = count;
+}
+
+static int irq_setup_virq(struct irq_domain *domain, unsigned int virq,
+                            irq_hw_number_t hwirq)
+{
+        struct irq_data *irq_data = irq_get_irq_data(virq);
+
+        irq_data->hwirq = hwirq;
+        irq_data->domain = domain;
+        if (domain->ops->map(domain, virq, hwirq)) {
+                pr_debug("irq: -> mapping failed, freeing\n");
+                irq_data->domain = NULL;
+                irq_data->hwirq = 0;
+                return -1;
         }
+
+        irq_clear_status_flags(virq, IRQ_NOREQUEST);
+
+        return 0;
 }
 
-#if defined(CONFIG_OF_IRQ)
 /**
- * irq_create_of_mapping() - Map a linux irq number from a DT interrupt spec
+ * irq_create_direct_mapping() - Allocate an irq for direct mapping
+ * @domain: domain to allocate the irq for or NULL for default domain
  *
- * Used by the device tree interrupt mapping code to translate a device tree
- * interrupt specifier to a valid linux irq number.  Returns either a valid
- * linux IRQ number or 0.
+ * 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.
+ */
+unsigned int irq_create_direct_mapping(struct irq_domain *domain)
+{
+        unsigned int virq;
+
+        if (domain == NULL)
+                domain = irq_default_domain;
+
+        BUG_ON(domain == NULL);
+        WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP);
+
+        virq = irq_alloc_desc_from(1, 0);
+        if (!virq) {
+                pr_debug("irq: create_direct virq allocation failed\n");
+                return 0;
+        }
+        if (virq >= irq_virq_count) {
+                pr_err("ERROR: no free irqs available below %i maximum\n",
+                        irq_virq_count);
+                irq_free_desc(virq);
+                return 0;
+        }
+
+        pr_debug("irq: create_direct obtained virq %d\n", virq);
+
+        if (irq_setup_virq(domain, virq, virq)) {
+                irq_free_desc(virq);
+                return 0;
+        }
+
+        return virq;
+}
+
+/**
+ * irq_create_mapping() - 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
  *
- * When the caller no longer need the irq number returned by this function it
- * should arrange to call irq_dispose_mapping().
+ * 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(struct irq_domain *domain,
+                                irq_hw_number_t hwirq)
+{
+        unsigned int virq, hint;
+
+        pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
+
+        /* Look for default domain if nececssary */
+        if (domain == NULL)
+                domain = irq_default_domain;
+        if (domain == NULL) {
+                printk(KERN_WARNING "irq_create_mapping called for"
+                       " NULL domain, hwirq=%lx\n", hwirq);
+                WARN_ON(1);
+                return 0;
+        }
+        pr_debug("irq: -> using domain @%p\n", domain);
+
+        /* Check if mapping already exists */
+        virq = irq_find_mapping(domain, hwirq);
+        if (virq) {
+                pr_debug("irq: -> existing mapping on virq %d\n", virq);
+                return virq;
+        }
+
+        /* Get a virtual interrupt number */
+        if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
+                return irq_domain_legacy_revmap(domain, hwirq);
+
+        /* Allocate a virtual interrupt number */
+        hint = hwirq % irq_virq_count;
+        if (hint == 0)
+                hint++;
+        virq = irq_alloc_desc_from(hint, 0);
+        if (!virq)
+                virq = irq_alloc_desc_from(1, 0);
+        if (!virq) {
+                pr_debug("irq: -> virq allocation failed\n");
+                return 0;
+        }
+
+        if (irq_setup_virq(domain, virq, hwirq)) {
+                if (domain->revmap_type != IRQ_DOMAIN_MAP_LEGACY)
+                        irq_free_desc(virq);
+                return 0;
+        }
+
+        pr_debug("irq: irq %lu on domain %s mapped to virtual irq %u\n",
+                hwirq, domain->of_node ? domain->of_node->full_name : "null", virq);
+
+        return virq;
+}
+EXPORT_SYMBOL_GPL(irq_create_mapping);
+
 unsigned int irq_create_of_mapping(struct device_node *controller,
                                    const u32 *intspec, unsigned int intsize)
 {
         struct irq_domain *domain;
-        unsigned long hwirq;
-        unsigned int irq, type;
-        int rc = -EINVAL;
+        irq_hw_number_t hwirq;
+        unsigned int type = IRQ_TYPE_NONE;
+        unsigned int virq;
 
-        /* Find a domain which can translate the irq spec */
-        mutex_lock(&irq_domain_mutex);
-        list_for_each_entry(domain, &irq_domain_list, list) {
-                if (!domain->ops->dt_translate)
-                        continue;
-                rc = domain->ops->dt_translate(domain, controller,
-                                        intspec, intsize, &hwirq, &type);
-                if (rc == 0)
-                        break;
+        domain = controller ? irq_find_host(controller) : irq_default_domain;
+        if (!domain) {
+#ifdef CONFIG_MIPS
+                /*
+                 * Workaround to avoid breaking interrupt controller drivers
+                 * that don't yet register an irq_domain.  This is temporary
+                 * code. ~~~gcl, Feb 24, 2012
+                 *
+                 * Scheduled for removal in Linux v3.6.  That should be enough
+                 * time.
+                 */
+                if (intsize > 0)
+                        return intspec[0];
+#endif
+                printk(KERN_WARNING "irq: no irq domain found for %s !\n",
+                       controller->full_name);
+                return 0;
         }
-        mutex_unlock(&irq_domain_mutex);
 
-        if (rc != 0)
-                return 0;
+        /* If domain has no translation, then we assume interrupt line */
+        if (domain->ops->xlate == NULL)
+                hwirq = intspec[0];
+        else {
+                if (domain->ops->xlate(domain, controller, intspec, intsize,
+                                     &hwirq, &type))
+                        return 0;
+        }
+
+        /* Create mapping */
+        virq = irq_create_mapping(domain, hwirq);
+        if (!virq)
+                return virq;
 
-        irq = irq_domain_to_irq(domain, hwirq);
-        if (type != IRQ_TYPE_NONE)
-                irq_set_irq_type(irq, type);
-        pr_debug("%s: mapped hwirq=%i to irq=%i, flags=%x\n",
-                 controller->full_name, (int)hwirq, irq, type);
-        return irq;
+        /* Set type if specified and different than the current one */
+        if (type != IRQ_TYPE_NONE &&
+            type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
+                irq_set_irq_type(virq, type);
+        return virq;
 }
 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
 
 /**
- * irq_dispose_mapping() - Discard a mapping created by irq_create_of_mapping()
- * @irq: linux irq number to be discarded
+ * 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;
+        irq_hw_number_t hwirq;
+
+        if (!virq || !irq_data)
+                return;
+
+        domain = irq_data->domain;
+        if (WARN_ON(domain == NULL))
+                return;
+
+        /* Never unmap legacy interrupts */
+        if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
+                return;
+
+        irq_set_status_flags(virq, IRQ_NOREQUEST);
+
+        /* remove chip and handler */
+        irq_set_chip_and_handler(virq, NULL, NULL);
+
+        /* Make sure it's completed */
+        synchronize_irq(virq);
+
+        /* Tell the PIC about it */
+        if (domain->ops->unmap)
+                domain->ops->unmap(domain, virq);
+        smp_mb();
+
+        /* Clear reverse map */
+        hwirq = irq_data->hwirq;
+        switch(domain->revmap_type) {
+        case IRQ_DOMAIN_MAP_LINEAR:
+                if (hwirq < domain->revmap_data.linear.size)
+                        domain->revmap_data.linear.revmap[hwirq] = 0;
+                break;
+        case IRQ_DOMAIN_MAP_TREE:
+                mutex_lock(&revmap_trees_mutex);
+                radix_tree_delete(&domain->revmap_data.tree, hwirq);
+                mutex_unlock(&revmap_trees_mutex);
+                break;
+        }
+
+        irq_free_desc(virq);
+}
+EXPORT_SYMBOL_GPL(irq_dispose_mapping);
+
+/**
+ * irq_find_mapping() - Find a linux irq from an hw irq number.
+ * @domain: domain owning this hardware interrupt
+ * @hwirq: hardware irq number in that domain space
+ *
+ * This is a slow path, for use by generic code. It's expected that an
+ * irq controller implementation directly calls the appropriate low level
+ * mapping function.
+ */
+unsigned int irq_find_mapping(struct irq_domain *domain,
+                              irq_hw_number_t hwirq)
+{
+        unsigned int i;
+        unsigned int hint = hwirq % irq_virq_count;
+
+        /* Look for default domain if nececssary */
+        if (domain == NULL)
+                domain = irq_default_domain;
+        if (domain == NULL)
+                return 0;
+
+        /* legacy -> bail early */
+        if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
+                return irq_domain_legacy_revmap(domain, hwirq);
+
+        /* Slow path does a linear search of the map */
+        if (hint == 0)
+                hint = 1;
+        i = hint;
+        do {
+                struct irq_data *data = irq_get_irq_data(i);
+                if (data && (data->domain == domain) && (data->hwirq == hwirq))
+                        return i;
+                i++;
+                if (i >= irq_virq_count)
+                        i = 1;
+        } while(i != hint);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(irq_find_mapping);
+
+/**
+ * irq_radix_revmap_lookup() - Find a linux irq from a hw irq number.
+ * @domain: domain owning this hardware interrupt
+ * @hwirq: hardware irq number in that domain space
  *
- * Calling this function indicates the caller no longer needs a reference to
- * the linux irq number returned by a prior call to irq_create_of_mapping().
+ * This is a fast path, for use by irq controller code that uses radix tree
+ * revmaps
  */
-void irq_dispose_mapping(unsigned int irq)
+unsigned int irq_radix_revmap_lookup(struct irq_domain *domain,
+                                     irq_hw_number_t hwirq)
 {
+        struct irq_data *irq_data;
+
+        if (WARN_ON_ONCE(domain->revmap_type != IRQ_DOMAIN_MAP_TREE))
+                return irq_find_mapping(domain, hwirq);
+
+        /*
+         * Freeing an irq can delete nodes along the path to
+         * do the lookup via call_rcu.
+         */
+        rcu_read_lock();
+        irq_data = radix_tree_lookup(&domain->revmap_data.tree, hwirq);
+        rcu_read_unlock();
+
         /*
-         * nothing yet; will be filled when support for dynamic allocation of
-         * irq_descs is added to irq_domain
+         * If found in radix tree, then fine.
+         * Else fallback to linear lookup - this should not happen in practice
+         * as it means that we failed to insert the node in the radix tree.
          */
+        return irq_data ? irq_data->irq : irq_find_mapping(domain, hwirq);
 }
-EXPORT_SYMBOL_GPL(irq_dispose_mapping);
 
-int irq_domain_simple_dt_translate(struct irq_domain *d,
-                            struct device_node *controller,
-                            const u32 *intspec, unsigned int intsize,
-                            unsigned long *out_hwirq, unsigned int *out_type)
+/**
+ * irq_radix_revmap_insert() - Insert a hw irq to linux irq number mapping.
+ * @domain: domain owning this hardware interrupt
+ * @virq: linux irq number
+ * @hwirq: hardware irq number in that domain space
+ *
+ * This is for use by irq controllers that use a radix tree reverse
+ * mapping for fast lookup.
+ */
+void irq_radix_revmap_insert(struct irq_domain *domain, unsigned int virq,
+                             irq_hw_number_t hwirq)
 {
-        if (d->of_node != controller)
-                return -EINVAL;
-        if (intsize < 1)
-                return -EINVAL;
-        if (d->nr_irq && ((intspec[0] < d->hwirq_base) ||
-            (intspec[0] >= d->hwirq_base + d->nr_irq)))
-                return -EINVAL;
+        struct irq_data *irq_data = irq_get_irq_data(virq);
+
+        if (WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_TREE))
+                return;
+
+        if (virq) {
+                mutex_lock(&revmap_trees_mutex);
+                radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data);
+                mutex_unlock(&revmap_trees_mutex);
+        }
+}
+
+/**
+ * irq_linear_revmap() - Find a linux irq from a hw irq number.
+ * @domain: domain owning this hardware interrupt
+ * @hwirq: hardware irq number in that domain space
+ *
+ * This is a fast path, for use by irq controller code that uses linear
+ * revmaps. It does fallback to the slow path if the revmap doesn't exist
+ * yet and will create the revmap entry with appropriate locking
+ */
+unsigned int irq_linear_revmap(struct irq_domain *domain,
+                               irq_hw_number_t hwirq)
+{
+        unsigned int *revmap;
+
+        if (WARN_ON_ONCE(domain->revmap_type != IRQ_DOMAIN_MAP_LINEAR))
+                return irq_find_mapping(domain, hwirq);
+
+        /* Check revmap bounds */
+        if (unlikely(hwirq >= domain->revmap_data.linear.size))
+                return irq_find_mapping(domain, hwirq);
+
+        /* Check if revmap was allocated */
+        revmap = domain->revmap_data.linear.revmap;
+        if (unlikely(revmap == NULL))
+                return irq_find_mapping(domain, hwirq);
+
+        /* Fill up revmap with slow path if no mapping found */
+        if (unlikely(!revmap[hwirq]))
+                revmap[hwirq] = irq_find_mapping(domain, hwirq);
+
+        return revmap[hwirq];
+}
+
+#ifdef CONFIG_IRQ_DOMAIN_DEBUG
+static int virq_debug_show(struct seq_file *m, void *private)
+{
+        unsigned long flags;
+        struct irq_desc *desc;
+        const char *p;
+        static const char none[] = "none";
+        void *data;
+        int i;
+
+        seq_printf(m, "%-5s  %-7s  %-15s  %-18s  %s\n", "virq", "hwirq",
+                      "chip name", "chip data", "domain name");
+
+        for (i = 1; i < nr_irqs; i++) {
+                desc = irq_to_desc(i);
+                if (!desc)
+                        continue;
+
+                raw_spin_lock_irqsave(&desc->lock, flags);
+
+                if (desc->action && desc->action->handler) {
+                        struct irq_chip *chip;
+
+                        seq_printf(m, "%5d  ", i);
+                        seq_printf(m, "0x%05lx  ", desc->irq_data.hwirq);
+
+                        chip = irq_desc_get_chip(desc);
+                        if (chip && chip->name)
+                                p = chip->name;
+                        else
+                                p = none;
+                        seq_printf(m, "%-15s  ", p);
+
+                        data = irq_desc_get_chip_data(desc);
+                        seq_printf(m, "0x%16p  ", data);
+
+                        if (desc->irq_data.domain && desc->irq_data.domain->of_node)
+                                p = desc->irq_data.domain->of_node->full_name;
+                        else
+                                p = none;
+                        seq_printf(m, "%s\n", p);
+                }
+
+                raw_spin_unlock_irqrestore(&desc->lock, flags);
+        }
+
+        return 0;
+}
 
+static int virq_debug_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, virq_debug_show, inode->i_private);
+}
+
+static const struct file_operations virq_debug_fops = {
+        .open = virq_debug_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+static int __init irq_debugfs_init(void)
+{
+        if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL,
+                                 NULL, &virq_debug_fops) == NULL)
+                return -ENOMEM;
+
+        return 0;
+}
+__initcall(irq_debugfs_init);
+#endif /* CONFIG_IRQ_DOMAIN_DEBUG */
+
+int irq_domain_simple_map(struct irq_domain *d, unsigned int irq,
+                          irq_hw_number_t hwirq)
+{
+        return 0;
+}
+
+/**
+ * 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;
-        if (intsize > 1)
-                *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
         return 0;
 }
+EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
 
 /**
- * irq_domain_create_simple() - Set up a 'simple' translation range
+ * 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.
  */
-void irq_domain_add_simple(struct device_node *controller, int irq_base)
+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_domain *domain;
-
-        domain = kzalloc(sizeof(*domain), GFP_KERNEL);
-        if (!domain) {
-                WARN_ON(1);
-                return;
-        }
+        if (WARN_ON(intsize < 2))
+                return -EINVAL;
+        *out_hwirq = intspec[0];
+        *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
+        return 0;
+}
+EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
 
-        domain->irq_base = irq_base;
-        domain->of_node = of_node_get(controller);
-        domain->ops = &irq_domain_simple_ops;
-        irq_domain_add(domain);
+/**
+ * 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];
+        *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE;
+        return 0;
 }
-EXPORT_SYMBOL_GPL(irq_domain_add_simple);
+EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
 
+const struct irq_domain_ops irq_domain_simple_ops = {
+        .map = irq_domain_simple_map,
+        .xlate = irq_domain_xlate_onetwocell,
+};
+EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
+
+#ifdef CONFIG_OF_IRQ
 void irq_domain_generate_simple(const struct of_device_id *match,
                                 u64 phys_base, unsigned int irq_start)
 {
         struct device_node *node;
-        pr_info("looking for phys_base=%llx, irq_start=%i\n",
+        pr_debug("looking for phys_base=%llx, irq_start=%i\n",
                 (unsigned long long) phys_base, (int) irq_start);
         node = of_find_matching_node_by_address(NULL, match, phys_base);
         if (node)
-                irq_domain_add_simple(node, irq_start);
-        else
-                pr_info("no node found\n");
+                irq_domain_add_legacy(node, 32, irq_start, 0,
+                                      &irq_domain_simple_ops, NULL);
 }
 EXPORT_SYMBOL_GPL(irq_domain_generate_simple);
-#endif /* CONFIG_OF_IRQ */
-
-struct irq_domain_ops irq_domain_simple_ops = {
-#ifdef CONFIG_OF_IRQ
-        .dt_translate = irq_domain_simple_dt_translate,
-#endif /* CONFIG_OF_IRQ */
-};
-EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
+#endif