lkml.org 
[lkml]   [2014]   [Nov]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [patch 01/16] irqdomain: Introduce new interfaces to support hierarchy irqdomains
Hi Thomas, Jiang,
On 2014/11/12 21:42, Thomas Gleixner wrote:

> From: Jiang Liu <jiang.liu@linux.intel.com>
>
[...]
> /* Number of irqs reserved for a legacy isa controller */
> #define NUM_ISA_INTERRUPTS 16
> @@ -64,6 +66,16 @@ struct irq_domain_ops {
> int (*xlate)(struct irq_domain *d, struct device_node *node,
> const u32 *intspec, unsigned int intsize,
> unsigned long *out_hwirq, unsigned int *out_type);
> +
> +#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
> + /* extended V2 interfaces to support hierarchy irq_domains */
> + int (*alloc)(struct irq_domain *d, unsigned int virq,
> + unsigned int nr_irqs, void *arg);
> + void (*free)(struct irq_domain *d, unsigned int virq,
> + unsigned int nr_irqs);
> + void (*activate)(struct irq_domain *d, struct irq_data *irq_data);
> + void (*deactivate)(struct irq_domain *d, struct irq_data *irq_data);

What's the usage of the parameter domain reference in activate/deactivate?
I think the purpose of the two callbacks is to activate/deactivate the
irq_data->hwirq in irq_data->domain. If so, the first parameter @domain is
required to be equal to irq_data->domain (which makes @domain useless).
Besides, the main responsibility of interrupt domains is to manage mappings
between hardware and linux interrupt numbers, so would it be better if move
the two callbacks into struct irq_chip?

Thanks,
Abel.

> +#endif
> };
>
> extern struct irq_domain_ops irq_generic_chip_ops;
> @@ -77,6 +89,7 @@ struct irq_domain_chip_generic;
> * @ops: pointer to irq_domain methods
> * @host_data: private data pointer for use by owner. Not touched by irq_domain
> * core code.
> + * @flags: host per irq_domain flags
> *
> * Optional elements
> * @of_node: Pointer to device tree nodes associated with the irq_domain. Used
> @@ -84,6 +97,7 @@ struct irq_domain_chip_generic;
> * @gc: Pointer to a list of generic chips. There is a helper function for
> * setting up one or more generic chips for interrupt controllers
> * drivers using the generic chip library which uses this pointer.
> + * @parent: Pointer to parent irq_domain to support hierarchy irq_domains
> *
> * Revmap data, used internally by irq_domain
> * @revmap_direct_max_irq: The largest hwirq that can be set for controllers that
> @@ -97,10 +111,14 @@ struct irq_domain {
> const char *name;
> const struct irq_domain_ops *ops;
> void *host_data;
> + unsigned int flags;
>
> /* Optional data */
> struct device_node *of_node;
> struct irq_domain_chip_generic *gc;
> +#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
> + struct irq_domain *parent;
> +#endif
>
> /* reverse map data. The linear map gets appended to the irq_domain */
> irq_hw_number_t hwirq_max;
> @@ -110,6 +128,9 @@ struct irq_domain {
> unsigned int linear_revmap[];
> };
>
> +#define IRQ_DOMAIN_FLAG_HIERARCHY 0x1
> +#define IRQ_DOMAIN_FLAG_ARCH1 0x10000
> +
> #ifdef CONFIG_IRQ_DOMAIN
> struct irq_domain *__irq_domain_add(struct device_node *of_node, int size,
> irq_hw_number_t hwirq_max, int direct_max,
> @@ -220,8 +241,73 @@ int irq_domain_xlate_onetwocell(struct i
> const u32 *intspec, unsigned int intsize,
> irq_hw_number_t *out_hwirq, unsigned int *out_type);
>
> +/* V2 interfaces to support hierarchy IRQ domains. */
> +extern struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
> + unsigned int virq);
> +#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
> +extern int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
> + unsigned int nr_irqs, int node, void *arg,
> + bool realloc);
> +extern void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs);
> +extern void irq_domain_activate_irq(struct irq_data *irq_data);
> +extern void irq_domain_deactivate_irq(struct irq_data *irq_data);
> +
> +static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
> + unsigned int nr_irqs, int node, void *arg)
> +{
> + return __irq_domain_alloc_irqs(domain, -1, nr_irqs, node, arg, false);
> +}
> +
> +extern 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);
> +extern void irq_domain_reset_irq_data(struct irq_data *irq_data);
> +extern void irq_domain_free_irqs_common(struct irq_domain *domain,
> + int virq, int nr_irqs);
> +extern void irq_domain_free_irqs_top(struct irq_domain *domain,
> + int virq, int nr_irqs);
> +
> +static inline int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
> + int irq_base, unsigned int nr_irqs, void *arg)
> +{
> + if (domain->parent && domain->parent->ops->alloc)
> + return domain->parent->ops->alloc(domain->parent, irq_base,
> + nr_irqs, arg);
> + return -ENOSYS;
> +}
> +
> +static inline void irq_domain_free_irqs_parent(struct irq_domain *domain,
> + int irq_base, unsigned int nr_irqs)
> +{
> + if (domain->parent && domain->parent->ops->free)
> + domain->parent->ops->free(domain->parent, irq_base, nr_irqs);
> +}
> +
> +static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
> +{
> + return domain->flags & IRQ_DOMAIN_FLAG_HIERARCHY;
> +}
> +#else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
> +static inline void irq_domain_activate_irq(struct irq_data *data) { }
> +static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
> +static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
> + unsigned int nr_irqs, int node, void *arg)
> +{
> + return -1;
> +}
> +
> +static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
> +{
> + return false;
> +}
> +#endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
> +
> #else /* CONFIG_IRQ_DOMAIN */
> static inline void irq_dispose_mapping(unsigned int virq) { }
> +static inline void irq_domain_activate_irq(struct irq_data *data) { }
> +static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
> #endif /* !CONFIG_IRQ_DOMAIN */
>
> #endif /* _LINUX_IRQDOMAIN_H */
> Index: tip/kernel/irq/Kconfig
> ===================================================================
> --- tip.orig/kernel/irq/Kconfig
> +++ tip/kernel/irq/Kconfig
> @@ -55,6 +55,11 @@ config GENERIC_IRQ_CHIP
> config IRQ_DOMAIN
> bool
>
> +# Support for hierarchical irq domains
> +config IRQ_DOMAIN_HIERARCHY
> + bool
> + select IRQ_DOMAIN
> +
> config HANDLE_DOMAIN_IRQ
> bool
>
> Index: tip/kernel/irq/chip.c
> ===================================================================
> --- tip.orig/kernel/irq/chip.c
> +++ tip/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, b
> 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);
> }
>
> Index: tip/kernel/irq/irqdomain.c
> ===================================================================
> --- tip.orig/kernel/irq/irqdomain.c
> +++ tip/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_do
> * @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(stru
> 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
>
> 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_mapp
> 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 i
> }
>
> /* 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(struc
> 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) {
> @@ -480,6 +478,11 @@ unsigned int irq_create_of_mapping(struc
> return 0;
> }
>
> + if (irq_domain_is_hierarchy(domain)) {
> + virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, irq_data);
> + return virq <= 0 ? 0 : virq;
> + }
> +
> /* If domain has no translation, then we assume interrupt line */
> if (domain->ops->xlate == NULL)
> hwirq = irq_data->args[0];
> @@ -540,8 +543,8 @@ unsigned int irq_find_mapping(struct irq
> 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 +712,359 @@ const struct irq_domain_ops irq_domain_s
> .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
> +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)
> +{
> + int i;
> + struct irq_data *irq_data, *tmp;
> +
> + 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)
> +{
> + int i;
> + struct irq_data *irq_data;
> + struct irq_domain *parent;
> +
> + /* 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;
> +}
> +
> +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;
> +}
> +
> +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;
> +}
> +
> +void irq_domain_free_irqs_common(struct irq_domain *domain, int virq,
> + int nr_irqs)
> +{
> + int i;
> + struct irq_data *irq_data;
> +
> + 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);
> +}
> +
> +void irq_domain_free_irqs_top(struct irq_domain *domain, int virq,
> + 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);
> +}
> +
> +/**
> + * __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
> + * hiearchy 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 = domain->ops->alloc(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)
> +{
> + int i;
> + struct irq_data *data = irq_get_irq_data(virq);
> +
> + 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);
> + data->domain->ops->free(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_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 */
>
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
> .
>
>





\
 
 \ /
  Last update: 2014-11-24 14:01    [W:0.311 / U:4.888 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site