static DEFINE_MUTEX(revmap_trees_mutex);
static struct irq_domain *irq_default_domain;
+static int irq_domain_alloc_descs(int virq, unsigned int nr_irqs,
+ irq_hw_number_t hwirq, int node);
+static void irq_domain_check_hierarchy(struct irq_domain *domain);
+
/**
* __irq_domain_add() - Allocate a new irq_domain data structure
* @of_node: optional device-tree node of the interrupt controller
* @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: map/unmap domain callbacks
+ * @ops: domain callbacks
* @host_data: Controller private data pointer
*
* Allocates and initialize and irq_domain structure.
domain->hwirq_max = hwirq_max;
domain->revmap_size = size;
domain->revmap_direct_max_irq = direct_max;
+ irq_domain_check_hierarchy(domain);
mutex_lock(&irq_domain_mutex);
list_add(&domain->link, &irq_domain_list);
* @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: map/unmap domain callbacks
+ * @ops: domain callbacks
* @host_data: Controller private data pointer
*
* Allocates an irq_domain, and optionally if first_irq is positive then also
domain = __irq_domain_add(of_node, first_hwirq + size,
first_hwirq + size, 0, ops, host_data);
- if (!domain)
- return NULL;
-
- irq_domain_associate_many(domain, first_irq, first_hwirq, size);
+ if (domain)
+ irq_domain_associate_many(domain, first_irq, first_hwirq, size);
return domain;
}
unsigned int irq_create_mapping(struct irq_domain *domain,
irq_hw_number_t hwirq)
{
- unsigned int hint;
int virq;
pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
}
/* Allocate a virtual interrupt number */
- hint = hwirq % nr_irqs;
- if (hint == 0)
- hint++;
- virq = irq_alloc_desc_from(hint, of_node_to_nid(domain->of_node));
- if (virq <= 0)
- virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
+ virq = irq_domain_alloc_descs(-1, 1, hwirq,
+ of_node_to_nid(domain->of_node));
if (virq <= 0) {
pr_debug("-> virq allocation failed\n");
return 0;
struct irq_domain *domain;
irq_hw_number_t hwirq;
unsigned int type = IRQ_TYPE_NONE;
- unsigned int virq;
+ int virq;
domain = irq_data->np ? irq_find_host(irq_data->np) : irq_default_domain;
if (!domain) {
return 0;
}
- /* Create mapping */
- virq = irq_create_mapping(domain, hwirq);
- if (!virq)
- return virq;
+ if (irq_domain_is_hierarchy(domain)) {
+ /*
+ * 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)
+ return virq;
+
+ virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, irq_data);
+ if (virq <= 0)
+ return 0;
+ } else {
+ /* Create mapping */
+ virq = irq_create_mapping(domain, hwirq);
+ if (!virq)
+ return virq;
+ }
/* Set type if specified and different than the current one */
if (type != IRQ_TYPE_NONE &&
return 0;
if (hwirq < domain->revmap_direct_max_irq) {
- data = irq_get_irq_data(hwirq);
- if (data && (data->domain == domain) && (data->hwirq == hwirq))
+ data = irq_domain_get_irq_data(domain, hwirq);
+ if (data && data->hwirq == hwirq)
return hwirq;
}
.xlate = irq_domain_xlate_onetwocell,
};
EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
+
+static int irq_domain_alloc_descs(int virq, unsigned int cnt,
+ irq_hw_number_t hwirq, int node)
+{
+ unsigned int hint;
+
+ if (virq >= 0) {
+ virq = irq_alloc_descs(virq, virq, cnt, node);
+ } else {
+ hint = hwirq % nr_irqs;
+ if (hint == 0)
+ hint++;
+ virq = irq_alloc_descs_from(hint, cnt, node);
+ if (virq <= 0 && hint > 1)
+ virq = irq_alloc_descs_from(1, cnt, node);
+ }
+
+ return virq;
+}
+
+#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
+/**
+ * irq_domain_add_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
+ * @node: Optional device-tree node 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_add_hierarchy(struct irq_domain *parent,
+ unsigned int flags,
+ unsigned int size,
+ struct device_node *node,
+ const struct irq_domain_ops *ops,
+ void *host_data)
+{
+ struct irq_domain *domain;
+
+ if (size)
+ domain = irq_domain_add_linear(node, size, ops, host_data);
+ else
+ domain = irq_domain_add_tree(node, ops, host_data);
+ if (domain) {
+ domain->parent = parent;
+ domain->flags |= flags;
+ }
+
+ return domain;
+}
+
+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;
+ irq_hw_number_t hwirq = data->hwirq;
+
+ if (hwirq < domain->revmap_size) {
+ domain->linear_revmap[hwirq] = virq;
+ } else {
+ mutex_lock(&revmap_trees_mutex);
+ radix_tree_insert(&domain->revmap_tree, hwirq, data);
+ mutex_unlock(&revmap_trees_mutex);
+ }
+
+ /* 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;
+
+ if (hwirq < domain->revmap_size) {
+ domain->linear_revmap[hwirq] = 0;
+ } else {
+ mutex_lock(&revmap_trees_mutex);
+ radix_tree_delete(&domain->revmap_tree, hwirq);
+ mutex_unlock(&revmap_trees_mutex);
+ }
+ }
+}
+
+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, child->node);
+ if (irq_data) {
+ child->parent_data = irq_data;
+ irq_data->irq = child->irq;
+ irq_data->node = child->node;
+ irq_data->domain = domain;
+ }
+
+ return irq_data;
+}
+
+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;
+
+ while (tmp) {
+ irq_data = tmp;
+ tmp = tmp->parent_data;
+ kfree(irq_data);
+ }
+ }
+}
+
+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;
+}
+
+/**
+ * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
+ * @domain: Interrupt domain to match
+ * @virq: IRQ number
+ * @hwirq: The hwirq number
+ * @chip: The associated interrupt chip
+ * @chip_data: The associated chip data
+ */
+int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
+ irq_hw_number_t hwirq, struct irq_chip *chip,
+ void *chip_data)
+{
+ struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
+
+ if (!irq_data)
+ return -ENOENT;
+
+ irq_data->hwirq = hwirq;
+ irq_data->chip = chip ? chip : &no_irq_chip;
+ irq_data->chip_data = chip_data;
+
+ return 0;
+}
+
+/**
+ * irq_domain_set_info - Set the complete data for a @virq in @domain
+ * @domain: Interrupt domain to match
+ * @virq: IRQ number
+ * @hwirq: The hardware interrupt number
+ * @chip: The associated interrupt chip
+ * @chip_data: The associated interrupt chip data
+ * @handler: The interrupt flow handler
+ * @handler_data: The interrupt flow handler data
+ * @handler_name: The interrupt handler name
+ */
+void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
+ irq_hw_number_t hwirq, struct irq_chip *chip,
+ void *chip_data, irq_flow_handler_t handler,
+ void *handler_data, const char *handler_name)
+{
+ irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
+ __irq_set_handler(virq, handler, 0, handler_name);
+ irq_set_handler_data(virq, handler_data);
+}
+
+/**
+ * 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;
+}
+
+/**
+ * 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);
+}
+
+/**
+ * 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 bool irq_domain_is_auto_recursive(struct irq_domain *domain)
+{
+ return domain->flags & IRQ_DOMAIN_FLAG_AUTO_RECURSIVE;
+}
+
+static void irq_domain_free_irqs_recursive(struct irq_domain *domain,
+ unsigned int irq_base,
+ unsigned int nr_irqs)
+{
+ domain->ops->free(domain, irq_base, nr_irqs);
+ if (irq_domain_is_auto_recursive(domain)) {
+ BUG_ON(!domain->parent);
+ irq_domain_free_irqs_recursive(domain->parent, irq_base,
+ nr_irqs);
+ }
+}
+
+static int irq_domain_alloc_irqs_recursive(struct irq_domain *domain,
+ unsigned int irq_base,
+ unsigned int nr_irqs, void *arg)
+{
+ int ret = 0;
+ struct irq_domain *parent = domain->parent;
+ bool recursive = irq_domain_is_auto_recursive(domain);
+
+ BUG_ON(recursive && !parent);
+ if (recursive)
+ ret = irq_domain_alloc_irqs_recursive(parent, irq_base,
+ nr_irqs, arg);
+ if (ret >= 0)
+ ret = domain->ops->alloc(domain, irq_base, nr_irqs, arg);
+ if (ret < 0 && recursive)
+ irq_domain_free_irqs_recursive(parent, irq_base, nr_irqs);
+
+ return ret;
+}
+
+/**
+ * __irq_domain_alloc_irqs - Allocate IRQs from domain
+ * @domain: domain to allocate from
+ * @irq_base: allocate specified IRQ nubmer 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
+ *
+ * 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 hardwares 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)
+{
+ int i, ret, virq;
+
+ if (domain == NULL) {
+ domain = irq_default_domain;
+ if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
+ return -EINVAL;
+ }
+
+ if (!domain->ops->alloc) {
+ pr_debug("domain->ops->alloc() is NULL\n");
+ return -ENOSYS;
+ }
+
+ if (realloc && irq_base >= 0) {
+ virq = irq_base;
+ } else {
+ virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node);
+ 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_recursive(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++)
+ 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;
+}
+
+/**
+ * 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_recursive(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
+ * @irq_base: Base IRQ number
+ * @nr_irqs: Number of IRQs to allocate
+ * @arg: Allocation data (arch/domain specific)
+ *
+ * Check whether the domain has been setup recursive. If not allocate
+ * through the parent domain.
+ */
+int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
+ unsigned int irq_base, unsigned int nr_irqs,
+ void *arg)
+{
+ /* irq_domain_alloc_irqs_recursive() has called parent's alloc() */
+ if (irq_domain_is_auto_recursive(domain))
+ return 0;
+
+ domain = domain->parent;
+ if (domain)
+ return irq_domain_alloc_irqs_recursive(domain, irq_base,
+ nr_irqs, arg);
+ return -ENOSYS;
+}
+
+/**
+ * irq_domain_free_irqs_parent - Free interrupts from parent domain
+ * @irq_base: Base IRQ number
+ * @nr_irqs: Number of IRQs to free
+ *
+ * Check whether the domain has been setup recursive. If not free
+ * through the parent domain.
+ */
+void irq_domain_free_irqs_parent(struct irq_domain *domain,
+ unsigned int irq_base, unsigned int nr_irqs)
+{
+ /* irq_domain_free_irqs_recursive() will call parent's free */
+ if (!irq_domain_is_auto_recursive(domain) && domain->parent)
+ irq_domain_free_irqs_recursive(domain->parent, irq_base,
+ nr_irqs);
+}
+
+/**
+ * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
+ * interrupt
+ * @irq_data: outermost irq_data associated with interrupt
+ *
+ * This is the second step to call domain_ops->activate to program interrupt
+ * controllers, so the interrupt could actually get delivered.
+ */
+void irq_domain_activate_irq(struct irq_data *irq_data)
+{
+ if (irq_data && irq_data->domain) {
+ struct irq_domain *domain = irq_data->domain;
+
+ if (irq_data->parent_data)
+ irq_domain_activate_irq(irq_data->parent_data);
+ if (domain->ops->activate)
+ domain->ops->activate(domain, irq_data);
+ }
+}
+
+/**
+ * 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 (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 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;
+}
+
+static void irq_domain_check_hierarchy(struct irq_domain *domain)
+{
+}
+#endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
projects / firefly-linux-kernel-4.4.55.git / blobdiff