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Release 4.12 include/linux/irqdomain.h

Directory: include/linux
/*
 * irq_domain - IRQ translation domains
 *
 * Translation infrastructure between hw and linux irq numbers.  This is
 * helpful for interrupt controllers to implement mapping between hardware
 * irq numbers and the Linux irq number space.
 *
 * irq_domains also have hooks for translating device tree or other
 * firmware interrupt representations into a hardware irq number that
 * can be mapped back to a Linux irq number without any extra platform
 * support code.
 *
 * Interrupt controller "domain" data structure. This could be defined as a
 * irq domain controller. That is, it handles the mapping between hardware
 * and virtual interrupt numbers for a given interrupt domain. The domain
 * structure is generally created by the PIC code for a given PIC instance
 * (though a domain can cover more than one PIC if they have a flat number
 * model). It's the domain callbacks that are responsible for setting the
 * irq_chip on a given irq_desc after it's been mapped.
 *
 * The host code and data structures use a fwnode_handle pointer to
 * identify the domain. In some cases, and in order to preserve source
 * code compatibility, this fwnode pointer is "upgraded" to a DT
 * device_node. For those firmware infrastructures that do not provide
 * a unique identifier for an interrupt controller, the irq_domain
 * code offers a fwnode allocator.
 */

#ifndef _LINUX_IRQDOMAIN_H

#define _LINUX_IRQDOMAIN_H

#include <linux/types.h>
#include <linux/irqhandler.h>
#include <linux/of.h>
#include <linux/radix-tree.h>

struct device_node;
struct irq_domain;
struct of_device_id;
struct irq_chip;
struct irq_data;
struct cpumask;

/* Number of irqs reserved for a legacy isa controller */

#define NUM_ISA_INTERRUPTS	16


#define IRQ_DOMAIN_IRQ_SPEC_PARAMS 16

/**
 * struct irq_fwspec - generic IRQ specifier structure
 *
 * @fwnode:             Pointer to a firmware-specific descriptor
 * @param_count:        Number of device-specific parameters
 * @param:              Device-specific parameters
 *
 * This structure, directly modeled after of_phandle_args, is used to
 * pass a device-specific description of an interrupt.
 */

struct irq_fwspec {
	
struct fwnode_handle *fwnode;
	
int param_count;
	
u32 param[IRQ_DOMAIN_IRQ_SPEC_PARAMS];
};

/*
 * Should several domains have the same device node, but serve
 * different purposes (for example one domain is for PCI/MSI, and the
 * other for wired IRQs), they can be distinguished using a
 * bus-specific token. Most domains are expected to only carry
 * DOMAIN_BUS_ANY.
 */

enum irq_domain_bus_token {
	
DOMAIN_BUS_ANY		= 0,
	
DOMAIN_BUS_WIRED,
	
DOMAIN_BUS_PCI_MSI,
	
DOMAIN_BUS_PLATFORM_MSI,
	
DOMAIN_BUS_NEXUS,
	
DOMAIN_BUS_IPI,
	
DOMAIN_BUS_FSL_MC_MSI,
};

/**
 * struct irq_domain_ops - Methods for irq_domain objects
 * @match: Match an interrupt controller device node to a host, returns
 *         1 on a match
 * @map: Create or update a mapping between a virtual irq number and a hw
 *       irq number. This is called only once for a given mapping.
 * @unmap: Dispose of such a mapping
 * @xlate: Given a device tree node and interrupt specifier, decode
 *         the hardware irq number and linux irq type value.
 *
 * Functions below are provided by the driver and called whenever a new mapping
 * is created or an old mapping is disposed. The driver can then proceed to
 * whatever internal data structures management is required. It also needs
 * to setup the irq_desc when returning from map().
 */

struct irq_domain_ops {
	
int (*match)(struct irq_domain *d, struct device_node *node,
		     enum irq_domain_bus_token bus_token);
	
int (*select)(struct irq_domain *d, struct irq_fwspec *fwspec,
		      enum irq_domain_bus_token bus_token);
	
int (*map)(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw);
	
void (*unmap)(struct irq_domain *d, unsigned int virq);
	
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);
	
int (*translate)(struct irq_domain *d, struct irq_fwspec *fwspec,
			 unsigned long *out_hwirq, unsigned int *out_type);
#endif
};

extern struct irq_domain_ops irq_generic_chip_ops;

struct irq_domain_chip_generic;

/**
 * struct irq_domain - Hardware interrupt number translation object
 * @link: Element in global irq_domain list.
 * @name: Name of interrupt domain
 * @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
 *           when decoding device tree interrupt specifiers.
 * @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
 *                         support direct mapping
 * @revmap_size: Size of the linear map table @linear_revmap[]
 * @revmap_tree: Radix map tree for hwirqs that don't fit in the linear map
 * @linear_revmap: Linear table of hwirq->virq reverse mappings
 */

struct irq_domain {
	
struct list_head link;
	
const char *name;
	
const struct irq_domain_ops *ops;
	
void *host_data;
	
unsigned int flags;

	/* Optional data */
	
struct fwnode_handle *fwnode;
	
enum irq_domain_bus_token bus_token;
	
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;
	
unsigned int revmap_direct_max_irq;
	
unsigned int revmap_size;
	
struct radix_tree_root revmap_tree;
	
unsigned int linear_revmap[];
};

/* Irq domain flags */
enum {
	/* Irq domain is hierarchical */
	
IRQ_DOMAIN_FLAG_HIERARCHY	= (1 << 0),

	/* Core calls alloc/free recursive through the domain hierarchy. */
	
IRQ_DOMAIN_FLAG_AUTO_RECURSIVE	= (1 << 1),

	/* Irq domain is an IPI domain with virq per cpu */
	
IRQ_DOMAIN_FLAG_IPI_PER_CPU	= (1 << 2),

	/* Irq domain is an IPI domain with single virq */
	
IRQ_DOMAIN_FLAG_IPI_SINGLE	= (1 << 3),

	/* Irq domain implements MSIs */
	
IRQ_DOMAIN_FLAG_MSI		= (1 << 4),

	/* Irq domain implements MSI remapping */
	
IRQ_DOMAIN_FLAG_MSI_REMAP	= (1 << 5),

	/*
         * Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved
         * for implementation specific purposes and ignored by the
         * core code.
         */
	
IRQ_DOMAIN_FLAG_NONCORE		= (1 << 16),
};


static inline struct device_node *irq_domain_get_of_node(struct irq_domain *d) { return to_of_node(d->fwnode); }

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#ifdef CONFIG_IRQ_DOMAIN struct fwnode_handle *irq_domain_alloc_fwnode(void *data); void irq_domain_free_fwnode(struct fwnode_handle *fwnode); struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size, irq_hw_number_t hwirq_max, int direct_max, const struct irq_domain_ops *ops, void *host_data); struct irq_domain *irq_domain_add_simple(struct device_node *of_node, unsigned int size, unsigned int first_irq, const struct irq_domain_ops *ops, void *host_data); struct irq_domain *irq_domain_add_legacy(struct device_node *of_node, unsigned int size, unsigned int first_irq, irq_hw_number_t first_hwirq, const struct irq_domain_ops *ops, void *host_data); extern struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec, enum irq_domain_bus_token bus_token); extern bool irq_domain_check_msi_remap(void); extern void irq_set_default_host(struct irq_domain *host); extern int irq_domain_alloc_descs(int virq, unsigned int nr_irqs, irq_hw_number_t hwirq, int node, const struct cpumask *affinity);
static inline struct fwnode_handle *of_node_to_fwnode(struct device_node *node) { return node ? &node->fwnode : NULL; }

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static inline bool is_fwnode_irqchip(struct fwnode_handle *fwnode) { return fwnode && fwnode->type == FWNODE_IRQCHIP; }

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static inline struct irq_domain *irq_find_matching_fwnode(struct fwnode_handle *fwnode, enum irq_domain_bus_token bus_token) { struct irq_fwspec fwspec = { .fwnode = fwnode, }; return irq_find_matching_fwspec(&fwspec, bus_token); }

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static inline struct irq_domain *irq_find_matching_host(struct device_node *node, enum irq_domain_bus_token bus_token) { return irq_find_matching_fwnode(of_node_to_fwnode(node), bus_token); }

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static inline struct irq_domain *irq_find_host(struct device_node *node) { return irq_find_matching_host(node, DOMAIN_BUS_ANY); }

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/** * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain. * @of_node: pointer to interrupt controller's device tree node. * @size: Number of interrupts in the domain. * @ops: map/unmap domain callbacks * @host_data: Controller private data pointer */
static inline struct irq_domain *irq_domain_add_linear(struct device_node *of_node, unsigned int size, const struct irq_domain_ops *ops, void *host_data) { return __irq_domain_add(of_node_to_fwnode(of_node), size, size, 0, ops, host_data); }

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static inline struct irq_domain *irq_domain_add_nomap(struct device_node *of_node, unsigned int max_irq, const struct irq_domain_ops *ops, void *host_data) { return __irq_domain_add(of_node_to_fwnode(of_node), 0, max_irq, max_irq, ops, host_data); }

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static inline struct irq_domain *irq_domain_add_legacy_isa( struct device_node *of_node, const struct irq_domain_ops *ops, void *host_data) { return irq_domain_add_legacy(of_node, NUM_ISA_INTERRUPTS, 0, 0, ops, host_data); }

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static inline struct irq_domain *irq_domain_add_tree(struct device_node *of_node, const struct irq_domain_ops *ops, void *host_data) { return __irq_domain_add(of_node_to_fwnode(of_node), 0, ~0, 0, ops, host_data); }

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static inline struct irq_domain *irq_domain_create_linear(struct fwnode_handle *fwnode, unsigned int size, const struct irq_domain_ops *ops, void *host_data) { return __irq_domain_add(fwnode, size, size, 0, ops, host_data); }

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static inline struct irq_domain *irq_domain_create_tree(struct fwnode_handle *fwnode, const struct irq_domain_ops *ops, void *host_data) { return __irq_domain_add(fwnode, 0, ~0, 0, ops, host_data); }

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extern void irq_domain_remove(struct irq_domain *host); extern int irq_domain_associate(struct irq_domain *domain, unsigned int irq, irq_hw_number_t hwirq); extern void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base, irq_hw_number_t hwirq_base, int count); extern void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq); extern unsigned int irq_create_mapping(struct irq_domain *host, irq_hw_number_t hwirq); extern unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec); extern void irq_dispose_mapping(unsigned int virq); /** * irq_linear_revmap() - Find a linux irq from a hw irq number. * @domain: domain owning this hardware interrupt * @hwirq: hardware irq number in that domain space * * This is a fast path alternative to irq_find_mapping() that can be * called directly by irq controller code to save a handful of * instructions. It is always safe to call, but won't find irqs mapped * using the radix tree. */
static inline unsigned int irq_linear_revmap(struct irq_domain *domain, irq_hw_number_t hwirq) { return hwirq < domain->revmap_size ? domain->linear_revmap[hwirq] : 0; }

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extern unsigned int irq_find_mapping(struct irq_domain *host, irq_hw_number_t hwirq); extern unsigned int irq_create_direct_mapping(struct irq_domain *host); extern int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base, irq_hw_number_t hwirq_base, int count);
static inline int irq_create_identity_mapping(struct irq_domain *host, irq_hw_number_t hwirq) { return irq_create_strict_mappings(host, hwirq, hwirq, 1); }

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extern const struct irq_domain_ops irq_domain_simple_ops; /* stock xlate functions */ int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr, const u32 *intspec, unsigned int intsize, irq_hw_number_t *out_hwirq, unsigned int *out_type); int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr, const u32 *intspec, unsigned int intsize, irq_hw_number_t *out_hwirq, unsigned int *out_type); 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); /* IPI functions */ int irq_reserve_ipi(struct irq_domain *domain, const struct cpumask *dest); int irq_destroy_ipi(unsigned int irq, const struct cpumask *dest); /* V2 interfaces to support hierarchy IRQ domains. */ extern struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain, unsigned int virq); extern 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); #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY extern struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent, unsigned int flags, unsigned int size, struct fwnode_handle *fwnode, const struct irq_domain_ops *ops, void *host_data);
static inline 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) { return irq_domain_create_hierarchy(parent, flags, size, of_node_to_fwnode(node), ops, host_data); }

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extern int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base, unsigned int nr_irqs, int node, void *arg, bool realloc, const struct cpumask *affinity); 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, NULL); }

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extern int irq_domain_alloc_irqs_recursive(struct irq_domain *domain, unsigned int irq_base, unsigned int nr_irqs, void *arg); 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, unsigned int virq, unsigned int nr_irqs); extern void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs); extern int irq_domain_alloc_irqs_parent(struct irq_domain *domain, unsigned int irq_base, unsigned int nr_irqs, void *arg); extern void irq_domain_free_irqs_parent(struct irq_domain *domain, unsigned int irq_base, unsigned int nr_irqs);
static inline bool irq_domain_is_hierarchy(struct irq_domain *domain) { return domain->flags & IRQ_DOMAIN_FLAG_HIERARCHY; }

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static inline bool irq_domain_is_ipi(struct irq_domain *domain) { return domain->flags & (IRQ_DOMAIN_FLAG_IPI_PER_CPU | IRQ_DOMAIN_FLAG_IPI_SINGLE); }

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static inline bool irq_domain_is_ipi_per_cpu(struct irq_domain *domain) { return domain->flags & IRQ_DOMAIN_FLAG_IPI_PER_CPU; }

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static inline bool irq_domain_is_ipi_single(struct irq_domain *domain) { return domain->flags & IRQ_DOMAIN_FLAG_IPI_SINGLE; }

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static inline bool irq_domain_is_msi(struct irq_domain *domain) { return domain->flags & IRQ_DOMAIN_FLAG_MSI; }

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static inline bool irq_domain_is_msi_remap(struct irq_domain *domain) { return domain->flags & IRQ_DOMAIN_FLAG_MSI_REMAP; }

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extern bool irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain); #else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
static inline void irq_domain_activate_irq(struct irq_data *data) { }

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static inline void irq_domain_deactivate_irq(struct irq_data *data) { }

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static inline int irq_domain_alloc_irqs(struct irq_domain *domain, unsigned int nr_irqs, int node, void *arg) { return -1; }

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static inline void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs) { }

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static inline bool irq_domain_is_hierarchy(struct irq_domain *domain) { return false; }

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static inline bool irq_domain_is_ipi(struct irq_domain *domain) { return false; }

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static inline bool irq_domain_is_ipi_per_cpu(struct irq_domain *domain) { return false; }

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static inline bool irq_domain_is_ipi_single(struct irq_domain *domain) { return false; }

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static inline bool irq_domain_is_msi(struct irq_domain *domain) { return false; }

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static inline bool irq_domain_is_msi_remap(struct irq_domain *domain) { return false; }

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static inline bool irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain) { return false; }

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#endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */ #else /* CONFIG_IRQ_DOMAIN */
static inline void irq_dispose_mapping(unsigned int virq) { }

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static inline void irq_domain_activate_irq(struct irq_data *data) { }

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static inline void irq_domain_deactivate_irq(struct irq_data *data) { }

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static inline struct irq_domain *irq_find_matching_fwnode( struct fwnode_handle *fwnode, enum irq_domain_bus_token bus_token) { return NULL; }

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static inline bool irq_domain_check_msi_remap(void) { return false; }

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#endif /* !CONFIG_IRQ_DOMAIN */ #endif /* _LINUX_IRQDOMAIN_H */

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Eric Auger1185.47%23.39%
Suravee Suthikulpanit421.95%23.39%
Stefan Agner381.76%11.69%
Thomas Gleixner301.39%23.39%
Mark Brown231.07%11.69%
Jon Hunter140.65%11.69%
Mian Yousaf Kaukab120.56%11.69%
Paul Mundt100.46%11.69%
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