diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/irq/Kconfig | 15 | ||||
| -rw-r--r-- | kernel/irq/Makefile | 1 | ||||
| -rw-r--r-- | kernel/irq/chip.c | 130 | ||||
| -rw-r--r-- | kernel/irq/irqdomain.c | 567 | ||||
| -rw-r--r-- | kernel/irq/manage.c | 2 | ||||
| -rw-r--r-- | kernel/irq/msi.c | 330 |
6 files changed, 1024 insertions, 21 deletions
diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig index 225086b2652e..9a76e3beda54 100644 --- a/kernel/irq/Kconfig +++ b/kernel/irq/Kconfig @@ -55,6 +55,21 @@ config GENERIC_IRQ_CHIP config IRQ_DOMAIN bool +# Support for hierarchical irq domains +config IRQ_DOMAIN_HIERARCHY + bool + select IRQ_DOMAIN + +# Generic MSI interrupt support +config GENERIC_MSI_IRQ + bool + +# Generic MSI hierarchical interrupt domain support +config GENERIC_MSI_IRQ_DOMAIN + bool + select IRQ_DOMAIN_HIERARCHY + select GENERIC_MSI_IRQ + config HANDLE_DOMAIN_IRQ bool diff --git a/kernel/irq/Makefile b/kernel/irq/Makefile index fff17381f0af..d12123526e2b 100644 --- a/kernel/irq/Makefile +++ b/kernel/irq/Makefile @@ -6,3 +6,4 @@ obj-$(CONFIG_IRQ_DOMAIN) += irqdomain.o obj-$(CONFIG_PROC_FS) += proc.o obj-$(CONFIG_GENERIC_PENDING_IRQ) += migration.o obj-$(CONFIG_PM_SLEEP) += pm.o +obj-$(CONFIG_GENERIC_MSI_IRQ) += msi.o diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index e5202f00cabc..6f1c7a566b95 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -15,6 +15,7 @@ #include <linux/module.h> #include <linux/interrupt.h> #include <linux/kernel_stat.h> +#include <linux/irqdomain.h> #include <trace/events/irq.h> @@ -178,6 +179,7 @@ int irq_startup(struct irq_desc *desc, bool resend) irq_state_clr_disabled(desc); desc->depth = 0; + irq_domain_activate_irq(&desc->irq_data); if (desc->irq_data.chip->irq_startup) { ret = desc->irq_data.chip->irq_startup(&desc->irq_data); irq_state_clr_masked(desc); @@ -199,6 +201,7 @@ void irq_shutdown(struct irq_desc *desc) desc->irq_data.chip->irq_disable(&desc->irq_data); else desc->irq_data.chip->irq_mask(&desc->irq_data); + irq_domain_deactivate_irq(&desc->irq_data); irq_state_set_masked(desc); } @@ -728,7 +731,30 @@ __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained, if (!handle) { handle = handle_bad_irq; } else { - if (WARN_ON(desc->irq_data.chip == &no_irq_chip)) + struct irq_data *irq_data = &desc->irq_data; +#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY + /* + * With hierarchical domains we might run into a + * situation where the outermost chip is not yet set + * up, but the inner chips are there. Instead of + * bailing we install the handler, but obviously we + * cannot enable/startup the interrupt at this point. + */ + while (irq_data) { + if (irq_data->chip != &no_irq_chip) + break; + /* + * Bail out if the outer chip is not set up + * and the interrrupt supposed to be started + * right away. + */ + if (WARN_ON(is_chained)) + goto out; + /* Try the parent */ + irq_data = irq_data->parent_data; + } +#endif + if (WARN_ON(!irq_data || irq_data->chip == &no_irq_chip)) goto out; } @@ -847,3 +873,105 @@ void irq_cpu_offline(void) raw_spin_unlock_irqrestore(&desc->lock, flags); } } + +#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY +/** + * irq_chip_ack_parent - Acknowledge the parent interrupt + * @data: Pointer to interrupt specific data + */ +void irq_chip_ack_parent(struct irq_data *data) +{ + data = data->parent_data; + data->chip->irq_ack(data); +} + +/** + * irq_chip_mask_parent - Mask the parent interrupt + * @data: Pointer to interrupt specific data + */ +void irq_chip_mask_parent(struct irq_data *data) +{ + data = data->parent_data; + data->chip->irq_mask(data); +} + +/** + * irq_chip_unmask_parent - Unmask the parent interrupt + * @data: Pointer to interrupt specific data + */ +void irq_chip_unmask_parent(struct irq_data *data) +{ + data = data->parent_data; + data->chip->irq_unmask(data); +} + +/** + * irq_chip_eoi_parent - Invoke EOI on the parent interrupt + * @data: Pointer to interrupt specific data + */ +void irq_chip_eoi_parent(struct irq_data *data) +{ + data = data->parent_data; + data->chip->irq_eoi(data); +} + +/** + * irq_chip_set_affinity_parent - Set affinity on the parent interrupt + * @data: Pointer to interrupt specific data + * @dest: The affinity mask to set + * @force: Flag to enforce setting (disable online checks) + * + * Conditinal, as the underlying parent chip might not implement it. + */ +int irq_chip_set_affinity_parent(struct irq_data *data, + const struct cpumask *dest, bool force) +{ + data = data->parent_data; + if (data->chip->irq_set_affinity) + return data->chip->irq_set_affinity(data, dest, force); + + return -ENOSYS; +} + +/** + * irq_chip_retrigger_hierarchy - Retrigger an interrupt in hardware + * @data: Pointer to interrupt specific data + * + * Iterate through the domain hierarchy of the interrupt and check + * whether a hw retrigger function exists. If yes, invoke it. + */ +int irq_chip_retrigger_hierarchy(struct irq_data *data) +{ + for (data = data->parent_data; data; data = data->parent_data) + if (data->chip && data->chip->irq_retrigger) + return data->chip->irq_retrigger(data); + + return -ENOSYS; +} +#endif + +/** + * irq_chip_compose_msi_msg - Componse msi message for a irq chip + * @data: Pointer to interrupt specific data + * @msg: Pointer to the MSI message + * + * For hierarchical domains we find the first chip in the hierarchy + * which implements the irq_compose_msi_msg callback. For non + * hierarchical we use the top level chip. + */ +int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) +{ + struct irq_data *pos = NULL; + +#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY + for (; data; data = data->parent_data) +#endif + if (data->chip && data->chip->irq_compose_msi_msg) + pos = data; + if (!pos) + return -ENOSYS; + + pos->chip->irq_compose_msi_msg(pos, msg); + + return 0; +} diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 6534ff6ce02e..7fac311057b8 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -23,6 +23,10 @@ static DEFINE_MUTEX(irq_domain_mutex); 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 @@ -30,7 +34,7 @@ static struct irq_domain *irq_default_domain; * @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. @@ -56,6 +60,7 @@ struct irq_domain *__irq_domain_add(struct device_node *of_node, int size, 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); @@ -109,7 +114,7 @@ EXPORT_SYMBOL_GPL(irq_domain_remove); * @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 @@ -174,10 +179,8 @@ struct irq_domain *irq_domain_add_legacy(struct device_node *of_node, 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; } @@ -388,7 +391,6 @@ EXPORT_SYMBOL_GPL(irq_create_direct_mapping); 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); @@ -410,12 +412,8 @@ unsigned int irq_create_mapping(struct irq_domain *domain, } /* 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; @@ -471,7 +469,7 @@ unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data) 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) { @@ -489,10 +487,24 @@ unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data) 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 && @@ -540,8 +552,8 @@ unsigned int irq_find_mapping(struct irq_domain *domain, 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; } @@ -709,3 +721,518 @@ const struct irq_domain_ops irq_domain_simple_ops = { .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 */ diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 0a9104b4608b..80692373abd6 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -183,6 +183,7 @@ int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask, ret = chip->irq_set_affinity(data, mask, force); switch (ret) { case IRQ_SET_MASK_OK: + case IRQ_SET_MASK_OK_DONE: cpumask_copy(data->affinity, mask); case IRQ_SET_MASK_OK_NOCOPY: irq_set_thread_affinity(desc); @@ -600,6 +601,7 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq, switch (ret) { case IRQ_SET_MASK_OK: + case IRQ_SET_MASK_OK_DONE: irqd_clear(&desc->irq_data, IRQD_TRIGGER_MASK); irqd_set(&desc->irq_data, flags); diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c new file mode 100644 index 000000000000..3e18163f336f --- /dev/null +++ b/kernel/irq/msi.c @@ -0,0 +1,330 @@ +/* + * linux/kernel/irq/msi.c + * + * Copyright (C) 2014 Intel Corp. + * Author: Jiang Liu <jiang.liu@linux.intel.com> + * + * This file is licensed under GPLv2. + * + * This file contains common code to support Message Signalled Interrupt for + * PCI compatible and non PCI compatible devices. + */ +#include <linux/types.h> +#include <linux/device.h> +#include <linux/irq.h> +#include <linux/irqdomain.h> +#include <linux/msi.h> + +/* Temparory solution for building, will be removed later */ +#include <linux/pci.h> + +void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg) +{ + *msg = entry->msg; +} + +void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg) +{ + struct msi_desc *entry = irq_get_msi_desc(irq); + + __get_cached_msi_msg(entry, msg); +} +EXPORT_SYMBOL_GPL(get_cached_msi_msg); + +#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN +static inline void irq_chip_write_msi_msg(struct irq_data *data, + struct msi_msg *msg) +{ + data->chip->irq_write_msi_msg(data, msg); +} + +/** + * msi_domain_set_affinity - Generic affinity setter function for MSI domains + * @irq_data: The irq data associated to the interrupt + * @mask: The affinity mask to set + * @force: Flag to enforce setting (disable online checks) + * + * Intended to be used by MSI interrupt controllers which are + * implemented with hierarchical domains. + */ +int msi_domain_set_affinity(struct irq_data *irq_data, + const struct cpumask *mask, bool force) +{ + struct irq_data *parent = irq_data->parent_data; + struct msi_msg msg; + int ret; + + ret = parent->chip->irq_set_affinity(parent, mask, force); + if (ret >= 0 && ret != IRQ_SET_MASK_OK_DONE) { + BUG_ON(irq_chip_compose_msi_msg(irq_data, &msg)); + irq_chip_write_msi_msg(irq_data, &msg); + } + + return ret; +} + +static void msi_domain_activate(struct irq_domain *domain, + struct irq_data *irq_data) +{ + struct msi_msg msg; + + BUG_ON(irq_chip_compose_msi_msg(irq_data, &msg)); + irq_chip_write_msi_msg(irq_data, &msg); +} + +static void msi_domain_deactivate(struct irq_domain *domain, + struct irq_data *irq_data) +{ + struct msi_msg msg; + + memset(&msg, 0, sizeof(msg)); + irq_chip_write_msi_msg(irq_data, &msg); +} + +static int msi_domain_alloc(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs, void *arg) +{ + struct msi_domain_info *info = domain->host_data; + struct msi_domain_ops *ops = info->ops; + irq_hw_number_t hwirq = ops->get_hwirq(info, arg); + int i, ret; + + if (irq_find_mapping(domain, hwirq) > 0) + return -EEXIST; + + ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg); + if (ret < 0) + return ret; + + for (i = 0; i < nr_irqs; i++) { + ret = ops->msi_init(domain, info, virq + i, hwirq + i, arg); + if (ret < 0) { + if (ops->msi_free) { + for (i--; i > 0; i--) + ops->msi_free(domain, info, virq + i); + } + irq_domain_free_irqs_top(domain, virq, nr_irqs); + return ret; + } + } + + return 0; +} + +static void msi_domain_free(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs) +{ + struct msi_domain_info *info = domain->host_data; + int i; + + if (info->ops->msi_free) { + for (i = 0; i < nr_irqs; i++) + info->ops->msi_free(domain, info, virq + i); + } + irq_domain_free_irqs_top(domain, virq, nr_irqs); +} + +static struct irq_domain_ops msi_domain_ops = { + .alloc = msi_domain_alloc, + .free = msi_domain_free, + .activate = msi_domain_activate, + .deactivate = msi_domain_deactivate, +}; + +#ifdef GENERIC_MSI_DOMAIN_OPS +static irq_hw_number_t msi_domain_ops_get_hwirq(struct msi_domain_info *info, + msi_alloc_info_t *arg) +{ + return arg->hwirq; +} + +static int msi_domain_ops_prepare(struct irq_domain *domain, struct device *dev, + int nvec, msi_alloc_info_t *arg) +{ + memset(arg, 0, sizeof(*arg)); + return 0; +} + +static void msi_domain_ops_set_desc(msi_alloc_info_t *arg, + struct msi_desc *desc) +{ + arg->desc = desc; +} +#else +#define msi_domain_ops_get_hwirq NULL +#define msi_domain_ops_prepare NULL +#define msi_domain_ops_set_desc NULL +#endif /* !GENERIC_MSI_DOMAIN_OPS */ + +static int msi_domain_ops_init(struct irq_domain *domain, + struct msi_domain_info *info, + unsigned int virq, irq_hw_number_t hwirq, + msi_alloc_info_t *arg) +{ + irq_domain_set_hwirq_and_chip(domain, virq, hwirq, info->chip, + info->chip_data); + if (info->handler && info->handler_name) { + __irq_set_handler(virq, info->handler, 0, info->handler_name); + if (info->handler_data) + irq_set_handler_data(virq, info->handler_data); + } + return 0; +} + +static int msi_domain_ops_check(struct irq_domain *domain, + struct msi_domain_info *info, + struct device *dev) +{ + return 0; +} + +static struct msi_domain_ops msi_domain_ops_default = { + .get_hwirq = msi_domain_ops_get_hwirq, + .msi_init = msi_domain_ops_init, + .msi_check = msi_domain_ops_check, + .msi_prepare = msi_domain_ops_prepare, + .set_desc = msi_domain_ops_set_desc, +}; + +static void msi_domain_update_dom_ops(struct msi_domain_info *info) +{ + struct msi_domain_ops *ops = info->ops; + + if (ops == NULL) { + info->ops = &msi_domain_ops_default; + return; + } + + if (ops->get_hwirq == NULL) + ops->get_hwirq = msi_domain_ops_default.get_hwirq; + if (ops->msi_init == NULL) + ops->msi_init = msi_domain_ops_default.msi_init; + if (ops->msi_check == NULL) + ops->msi_check = msi_domain_ops_default.msi_check; + if (ops->msi_prepare == NULL) + ops->msi_prepare = msi_domain_ops_default.msi_prepare; + if (ops->set_desc == NULL) + ops->set_desc = msi_domain_ops_default.set_desc; +} + +static void msi_domain_update_chip_ops(struct msi_domain_info *info) +{ + struct irq_chip *chip = info->chip; + + BUG_ON(!chip); + if (!chip->irq_mask) + chip->irq_mask = pci_msi_mask_irq; + if (!chip->irq_unmask) + chip->irq_unmask = pci_msi_unmask_irq; + if (!chip->irq_set_affinity) + chip->irq_set_affinity = msi_domain_set_affinity; +} + +/** + * msi_create_irq_domain - Create a MSI interrupt domain + * @of_node: Optional device-tree node of the interrupt controller + * @info: MSI domain info + * @parent: Parent irq domain + */ +struct irq_domain *msi_create_irq_domain(struct device_node *node, + struct msi_domain_info *info, + struct irq_domain *parent) +{ + if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS) + msi_domain_update_dom_ops(info); + if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS) + msi_domain_update_chip_ops(info); + + return irq_domain_add_hierarchy(parent, 0, 0, node, &msi_domain_ops, + info); +} + +/** + * msi_domain_alloc_irqs - Allocate interrupts from a MSI interrupt domain + * @domain: The domain to allocate from + * @dev: Pointer to device struct of the device for which the interrupts + * are allocated + * @nvec: The number of interrupts to allocate + * + * Returns 0 on success or an error code. + */ +int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev, + int nvec) +{ + struct msi_domain_info *info = domain->host_data; + struct msi_domain_ops *ops = info->ops; + msi_alloc_info_t arg; + struct msi_desc *desc; + int i, ret, virq = -1; + + ret = ops->msi_check(domain, info, dev); + if (ret == 0) + ret = ops->msi_prepare(domain, dev, nvec, &arg); + if (ret) + return ret; + + for_each_msi_entry(desc, dev) { + ops->set_desc(&arg, desc); + if (info->flags & MSI_FLAG_IDENTITY_MAP) + virq = (int)ops->get_hwirq(info, &arg); + else + virq = -1; + + virq = __irq_domain_alloc_irqs(domain, virq, desc->nvec_used, + dev_to_node(dev), &arg, false); + if (virq < 0) { + ret = -ENOSPC; + if (ops->handle_error) + ret = ops->handle_error(domain, desc, ret); + if (ops->msi_finish) + ops->msi_finish(&arg, ret); + return ret; + } + + for (i = 0; i < desc->nvec_used; i++) + irq_set_msi_desc_off(virq, i, desc); + } + + if (ops->msi_finish) + ops->msi_finish(&arg, 0); + + for_each_msi_entry(desc, dev) { + if (desc->nvec_used == 1) + dev_dbg(dev, "irq %d for MSI\n", virq); + else + dev_dbg(dev, "irq [%d-%d] for MSI\n", + virq, virq + desc->nvec_used - 1); + } + + return 0; +} + +/** + * msi_domain_free_irqs - Free interrupts from a MSI interrupt @domain associated tp @dev + * @domain: The domain to managing the interrupts + * @dev: Pointer to device struct of the device for which the interrupts + * are free + */ +void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev) +{ + struct msi_desc *desc; + + for_each_msi_entry(desc, dev) { + irq_domain_free_irqs(desc->irq, desc->nvec_used); + desc->irq = 0; + } +} + +/** + * msi_get_domain_info - Get the MSI interrupt domain info for @domain + * @domain: The interrupt domain to retrieve data from + * + * Returns the pointer to the msi_domain_info stored in + * @domain->host_data. + */ +struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain) +{ + return (struct msi_domain_info *)domain->host_data; +} + +#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */ |