Subject: [RFC Part2 v1 01/21] irqdomain: Introduce new interfaces to support hierarchy irqdomains

From: [email-masked] (Yasuaki Ishimatsu)
Date: Wed, 24 Sep 2014 15:55:29 +0900

(2014/09/11 23:03), Jiang Liu wrote:
> We plan to use hierarchy irqdomain to suppport CPU vector assignment,
> interrupt remapping controller, IO-APIC controller, MSI interrupt
> and hypertransport interrupt etc on x86 platforms. So extend irqdomain
> interfaces to support hierarchy irqdomain.
> 
> There are already many clients of current irqdomain interfaces.
> To minimize the changes, we choose to introduce new version 2 interfaces
> to support hierarchy instead of extending existing irqdomain interfaces.
> 
> According to Thomas's suggestion, the most important design decision is
> to build hierarchy struct irq_data to support hierarchy irqdomain, so
> hierarchy irqdomain related data could be saved in struct irq_data.
> With support of hierarchy irq_data, we could also support stacked
> irq_chips. This is most useful in case of set_affinity().
> 
> The new hierarchy irqdomain introduces following interfaces:
> 1) irq_domain_alloc_irqs()/irq_domain_free_irqs(): allocate/release IRQ
>     and related resources.
> 2) __irq_domain_alloc_irqs(): a special version to support legacy IRQs.
> 3) irq_domain_activate_irq()/irq_domain_deactivate_irq(): program
>     interrupt controllers to activate/deactivate interrupt.
> 
> There are also several help functions to ease irqdomain implemenations:
> 1) irq_domain_get_irq_data(): get irq_data associated with a specific
>     irqdomain.
> 2) irq_domain_set_hwirq_and_chip(): save irqdomain specific data into
>     irq_data.
> 3) irq_domain_alloc_irqs_parent()/irq_domain_free_irqs_parent(): invoke
>     parent irqdomain's alloc/free callbacks.
> 
> We also changed irq_startup()/irq_shutdown() to invoke
> irq_domain_activate_irq()/irq_domain_deactivate_irq() to program
> interrupt controller when start/stop interrupts.
> 
> Signed-off-by: Jiang Liu <[email-masked]>
> ---
>   include/linux/irq.h       |    3 +
>   include/linux/irqdomain.h |   60 ++++++++
>   kernel/irq/Kconfig        |    3 +
>   kernel/irq/chip.c         |    3 +
>   kernel/irq/irqdomain.c    |  349 +++++++++++++++++++++++++++++++++++++++++++--
>   5 files changed, 404 insertions(+), 14 deletions(-)
> 
> diff --git a/include/linux/irq.h b/include/linux/irq.h
> index 62af59242ddc..4b74565690ce 100644
> --- a/include/linux/irq.h
> +++ b/include/linux/irq.h
> @@ -151,6 +151,9 @@ struct irq_data {
>   	unsigned int		state_use_accessors;
>   	struct irq_chip		*chip;
>   	struct irq_domain	*domain;
> +#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
> +	struct irq_data		*parent_data;
> +#endif
>   	void			*handler_data;
>   	void			*chip_data;
>   	struct msi_desc		*msi_desc;
> diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
> index b0f9d16e48f6..a9ddc8534c63 100644
> --- a/include/linux/irqdomain.h
> +++ b/include/linux/irqdomain.h
> @@ -38,6 +38,7 @@
>   struct device_node;
>   struct irq_domain;
>   struct of_device_id;
> +struct irq_chip;
>   
>   /* Number of irqs reserved for a legacy isa controller */
>   #define NUM_ISA_INTERRUPTS	16
> @@ -64,6 +65,16 @@ 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 irqdomains */
> +	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);
> +	int (*activate)(struct irq_domain *d, struct irq_data *irq_data);
> +	int (*deactivate)(struct irq_domain *d, struct irq_data *irq_data);
> +#endif
>   };
>   
>   extern struct irq_domain_ops irq_generic_chip_ops;
> @@ -101,6 +112,9 @@ struct irq_domain {
>   	/* 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;
> @@ -220,8 +234,54 @@ int irq_domain_xlate_onetwocell(struct irq_domain *d, struct device_node *ctrlr,
>   			const u32 *intspec, unsigned int intsize,
>   			irq_hw_number_t *out_hwirq, unsigned int *out_type);
>   
> +#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
> +/* V2 interfaces to support hierarchy IRQ domains. */
> +extern struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
> +						unsigned int virq);
> +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 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 int irq_domain_activate_irq(struct irq_data *irq_data);
> +extern int irq_domain_deactivate_irq(struct irq_data *irq_data);
> +
> +static inline int irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
> +				unsigned int nr_irqs, int node, void *arg)
> +{
> +	return __irq_domain_alloc_irqs(domain, irq_base, nr_irqs, node,
> +				       arg, false);
> +}
> +
> +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);
> +}
> +#else	/* CONFIG_IRQ_DOMAIN_HIERARCHY */
> +static inline int irq_domain_activate_irq(struct irq_data *data) { return 0; }
> +static inline int irq_domain_deactivate_irq(struct irq_data *data) { return 0; }
> +#endif	/* CONFIG_IRQ_DOMAIN_HIERARCHY */
> +
>   #else /* CONFIG_IRQ_DOMAIN */
>   static inline void irq_dispose_mapping(unsigned int virq) { }
> +static inline int irq_domain_activate_irq(struct irq_data *data) { return 0; }
> +static inline int irq_domain_deactivate_irq(struct irq_data *data) { return 0; }
>   #endif /* !CONFIG_IRQ_DOMAIN */
>   
>   #endif /* _LINUX_IRQDOMAIN_H */
> diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig
> index d269cecdfbf0..dc1f3d08892e 100644
> --- a/kernel/irq/Kconfig
> +++ b/kernel/irq/Kconfig
> @@ -55,6 +55,9 @@ config GENERIC_IRQ_CHIP
>   config IRQ_DOMAIN
>   	bool
>   
> +config IRQ_DOMAIN_HIERARCHY
> +	bool
> +
>   config IRQ_DOMAIN_DEBUG
>   	bool "Expose hardware/virtual IRQ mapping via debugfs"
>   	depends on IRQ_DOMAIN && DEBUG_FS
> diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
> index 6223fab9a9d2..46bd5e2190c3 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);
>   }
>   
> diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
> index 6534ff6ce02e..e285f3abc595 100644
> --- a/kernel/irq/irqdomain.c
> +++ b/kernel/irq/irqdomain.c
> @@ -23,6 +23,9 @@ 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);
> +
>   /**
>    * __irq_domain_add() - Allocate a new irq_domain data structure
>    * @of_node: optional device-tree node of the interrupt controller
> @@ -30,7 +33,7 @@ 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.
> @@ -109,7 +112,7 @@ 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 +177,8 @@ 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 +389,6 @@ 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 +410,8 @@ 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;
> @@ -490,7 +486,13 @@ unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
>   	}
>   
>   	/* Create mapping */
> -	virq = irq_create_mapping(domain, hwirq);
> +#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
> +	if (domain->ops->alloc)
> +		virq = irq_domain_alloc_irqs(domain, -1, 1, NUMA_NO_NODE,
> +					     irq_data);
> +	else
> +#endif
> +		virq = irq_create_mapping(domain, hwirq);
>   	if (!virq)
>   		return virq;
>   
> @@ -540,7 +542,11 @@ unsigned int irq_find_mapping(struct irq_domain *domain,
>   		return 0;
>   
>   	if (hwirq < domain->revmap_direct_max_irq) {
> +#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
> +		data = irq_domain_get_irq_data(domain, hwirq);
> +#else
>   		data = irq_get_irq_data(hwirq);
> +#endif
>   		if (data && (data->domain == domain) && (data->hwirq == hwirq))
>   			return hwirq;
>   	}
> @@ -709,3 +715,318 @@ 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 nr_irqs,
> +				  irq_hw_number_t hwirq, int node)
> +{
> +	unsigned int hint;
> +
> +	if (virq >= 0) {
> +		virq = irq_alloc_descs(virq, virq, nr_irqs, node);
> +	} else {
> +		hint = hwirq % nr_irqs;
> +		if (hint == 0)
> +			hint++;
> +		virq = irq_alloc_descs_from(hint, nr_irqs, node);
> +		if (virq <= 0 && hint > 1)
> +			virq = irq_alloc_descs_from(1, nr_irqs, node);
> +	}
> +
> +	return virq;
> +}
> +
> +#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
> +static void irq_domain_free_descs(unsigned int virq, unsigned int nr_irqs)
> +{
> +	unsigned int i;
> +
> +	for (i = 0; i < nr_irqs; i++)
> +		irq_free_desc(virq + i);
> +}
> +
> +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;

Why don't you care NULL condition?

> +		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 outmost 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;

ditto.

Thanks,
Yasuaki Ishimatsu

> +
> +		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 assoicated 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;
> +	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 = NULL;
> +	irq_data->chip_data = NULL;
> +}
> +
> +/**
> + * 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
> + */
> +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_domain_free_descs(virq, nr_irqs);
> +	return ret;
> +}
> +
> +/**
> + * irq_domain_free_irqs - Free IRQ number and assoicated 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_domain_free_descs(virq, nr_irqs);
> +}
> +
> +/**
> + * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
> + *			     interrupt
> + * @irq_data: out most irq_data associated with interrupt
> + *
> + * It calls domain_ops->activate to program interrupt controllers, so the
> + * interrupt could actually delivered.
> + */
> +int irq_domain_activate_irq(struct irq_data *irq_data)
> +{
> +	int ret = 0;
> +
> +	if (irq_data && irq_data->domain) {
> +		struct irq_domain *domain = irq_data->domain;
> +
> +		if (irq_data->parent_data)
> +			ret = irq_domain_activate_irq(irq_data->parent_data);
> +		if (ret == 0 && domain->ops->activate)
> +			ret = domain->ops->activate(domain, irq_data);
> +	}
> +
> +	return ret;
> +}
> +
> +/**
> + * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to
> + *			       deactivate interrupt
> + * @irq_data: out most irq_data associated with interrupt
> + *
> + * It calls domain_ops->deactivate to program interrupt controllers to disable
> + * interrupt delivery.
> + */
> +int irq_domain_deactivate_irq(struct irq_data *irq_data)
> +{
> +	int ret = 0;
> +
> +	if (irq_data && irq_data->domain) {
> +		struct irq_domain *domain = irq_data->domain;
> +
> +		if (domain->ops->deactivate)
> +			ret = domain->ops->deactivate(domain, irq_data);
> +		if (ret == 0 && irq_data->parent_data)
> +			ret = irq_domain_deactivate_irq(irq_data->parent_data);
> +	}
> +
> +	return ret;
> +}
> +#endif	/* CONFIG_IRQ_DOMAIN_HIERARCHY */
>