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- #ifndef _LINUX_IRQ_H
- #define _LINUX_IRQ_H
- /*
- * Please do not include this file in generic code. There is currently
- * no requirement for any architecture to implement anything held
- * within this file.
- *
- * Thanks. --rmk
- */
- #include <linux/smp.h>
- #ifndef CONFIG_S390
- #include <linux/linkage.h>
- #include <linux/cache.h>
- #include <linux/spinlock.h>
- #include <linux/cpumask.h>
- #include <linux/irqreturn.h>
- #include <linux/errno.h>
- #include <asm/irq.h>
- #include <asm/ptrace.h>
- #include <asm/irq_regs.h>
- struct irq_desc;
- typedef void fastcall (*irq_flow_handler_t)(unsigned int irq,
- struct irq_desc *desc);
- /*
- * IRQ line status.
- *
- * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
- *
- * IRQ types
- */
- #define IRQ_TYPE_NONE 0x00000000 /* Default, unspecified type */
- #define IRQ_TYPE_EDGE_RISING 0x00000001 /* Edge rising type */
- #define IRQ_TYPE_EDGE_FALLING 0x00000002 /* Edge falling type */
- #define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
- #define IRQ_TYPE_LEVEL_HIGH 0x00000004 /* Level high type */
- #define IRQ_TYPE_LEVEL_LOW 0x00000008 /* Level low type */
- #define IRQ_TYPE_SENSE_MASK 0x0000000f /* Mask of the above */
- #define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */
- /* Internal flags */
- #define IRQ_INPROGRESS 0x00000100 /* IRQ handler active - do not enter! */
- #define IRQ_DISABLED 0x00000200 /* IRQ disabled - do not enter! */
- #define IRQ_PENDING 0x00000400 /* IRQ pending - replay on enable */
- #define IRQ_REPLAY 0x00000800 /* IRQ has been replayed but not acked yet */
- #define IRQ_AUTODETECT 0x00001000 /* IRQ is being autodetected */
- #define IRQ_WAITING 0x00002000 /* IRQ not yet seen - for autodetection */
- #define IRQ_LEVEL 0x00004000 /* IRQ level triggered */
- #define IRQ_MASKED 0x00008000 /* IRQ masked - shouldn't be seen again */
- #define IRQ_PER_CPU 0x00010000 /* IRQ is per CPU */
- #define IRQ_NOPROBE 0x00020000 /* IRQ is not valid for probing */
- #define IRQ_NOREQUEST 0x00040000 /* IRQ cannot be requested */
- #define IRQ_NOAUTOEN 0x00080000 /* IRQ will not be enabled on request irq */
- #define IRQ_WAKEUP 0x00100000 /* IRQ triggers system wakeup */
- #define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */
- #define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */
- #ifdef CONFIG_IRQ_PER_CPU
- # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
- # define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)
- #else
- # define CHECK_IRQ_PER_CPU(var) 0
- # define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING
- #endif
- struct proc_dir_entry;
- struct msi_desc;
- /**
- * struct irq_chip - hardware interrupt chip descriptor
- *
- * @name: name for /proc/interrupts
- * @startup: start up the interrupt (defaults to ->enable if NULL)
- * @shutdown: shut down the interrupt (defaults to ->disable if NULL)
- * @enable: enable the interrupt (defaults to chip->unmask if NULL)
- * @disable: disable the interrupt (defaults to chip->mask if NULL)
- * @ack: start of a new interrupt
- * @mask: mask an interrupt source
- * @mask_ack: ack and mask an interrupt source
- * @unmask: unmask an interrupt source
- * @eoi: end of interrupt - chip level
- * @end: end of interrupt - flow level
- * @set_affinity: set the CPU affinity on SMP machines
- * @retrigger: resend an IRQ to the CPU
- * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
- * @set_wake: enable/disable power-management wake-on of an IRQ
- *
- * @release: release function solely used by UML
- * @typename: obsoleted by name, kept as migration helper
- */
- struct irq_chip {
- const char *name;
- unsigned int (*startup)(unsigned int irq);
- void (*shutdown)(unsigned int irq);
- void (*enable)(unsigned int irq);
- void (*disable)(unsigned int irq);
- void (*ack)(unsigned int irq);
- void (*mask)(unsigned int irq);
- void (*mask_ack)(unsigned int irq);
- void (*unmask)(unsigned int irq);
- void (*eoi)(unsigned int irq);
- void (*end)(unsigned int irq);
- void (*set_affinity)(unsigned int irq, cpumask_t dest);
- int (*retrigger)(unsigned int irq);
- int (*set_type)(unsigned int irq, unsigned int flow_type);
- int (*set_wake)(unsigned int irq, unsigned int on);
- /* Currently used only by UML, might disappear one day.*/
- #ifdef CONFIG_IRQ_RELEASE_METHOD
- void (*release)(unsigned int irq, void *dev_id);
- #endif
- /*
- * For compatibility, ->typename is copied into ->name.
- * Will disappear.
- */
- const char *typename;
- };
- /**
- * struct irq_desc - interrupt descriptor
- *
- * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()]
- * @chip: low level interrupt hardware access
- * @msi_desc: MSI descriptor
- * @handler_data: per-IRQ data for the irq_chip methods
- * @chip_data: platform-specific per-chip private data for the chip
- * methods, to allow shared chip implementations
- * @action: the irq action chain
- * @status: status information
- * @depth: disable-depth, for nested irq_disable() calls
- * @wake_depth: enable depth, for multiple set_irq_wake() callers
- * @irq_count: stats field to detect stalled irqs
- * @irqs_unhandled: stats field for spurious unhandled interrupts
- * @lock: locking for SMP
- * @affinity: IRQ affinity on SMP
- * @cpu: cpu index useful for balancing
- * @pending_mask: pending rebalanced interrupts
- * @dir: /proc/irq/ procfs entry
- * @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP
- * @name: flow handler name for /proc/interrupts output
- *
- * Pad this out to 32 bytes for cache and indexing reasons.
- */
- struct irq_desc {
- irq_flow_handler_t handle_irq;
- struct irq_chip *chip;
- struct msi_desc *msi_desc;
- void *handler_data;
- void *chip_data;
- struct irqaction *action; /* IRQ action list */
- unsigned int status; /* IRQ status */
- unsigned int depth; /* nested irq disables */
- unsigned int wake_depth; /* nested wake enables */
- unsigned int irq_count; /* For detecting broken IRQs */
- unsigned int irqs_unhandled;
- spinlock_t lock;
- #ifdef CONFIG_SMP
- cpumask_t affinity;
- unsigned int cpu;
- #endif
- #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
- cpumask_t pending_mask;
- #endif
- #ifdef CONFIG_PROC_FS
- struct proc_dir_entry *dir;
- #endif
- const char *name;
- } ____cacheline_aligned;
- extern struct irq_desc irq_desc[NR_IRQS];
- /*
- * Migration helpers for obsolete names, they will go away:
- */
- #define hw_interrupt_type irq_chip
- typedef struct irq_chip hw_irq_controller;
- #define no_irq_type no_irq_chip
- typedef struct irq_desc irq_desc_t;
- /*
- * Pick up the arch-dependent methods:
- */
- #include <asm/hw_irq.h>
- extern int setup_irq(unsigned int irq, struct irqaction *new);
- #ifdef CONFIG_GENERIC_HARDIRQS
- #ifndef handle_dynamic_tick
- # define handle_dynamic_tick(a) do { } while (0)
- #endif
- #ifdef CONFIG_SMP
- #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
- void set_pending_irq(unsigned int irq, cpumask_t mask);
- void move_native_irq(int irq);
- void move_masked_irq(int irq);
- #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */
- static inline void move_irq(int irq)
- {
- }
- static inline void move_native_irq(int irq)
- {
- }
- static inline void move_masked_irq(int irq)
- {
- }
- static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
- {
- }
- #endif /* CONFIG_GENERIC_PENDING_IRQ */
- extern int irq_set_affinity(unsigned int irq, cpumask_t cpumask);
- extern int irq_can_set_affinity(unsigned int irq);
- #else /* CONFIG_SMP */
- #define move_native_irq(x)
- #define move_masked_irq(x)
- static inline int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
- {
- return -EINVAL;
- }
- static inline int irq_can_set_affinity(unsigned int irq) { return 0; }
- #endif /* CONFIG_SMP */
- #ifdef CONFIG_IRQBALANCE
- extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask);
- #else
- static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
- {
- }
- #endif
- #ifdef CONFIG_AUTO_IRQ_AFFINITY
- extern int select_smp_affinity(unsigned int irq);
- #else
- static inline int select_smp_affinity(unsigned int irq)
- {
- return 1;
- }
- #endif
- extern int no_irq_affinity;
- static inline int irq_balancing_disabled(unsigned int irq)
- {
- return irq_desc[irq].status & IRQ_NO_BALANCING_MASK;
- }
- /* Handle irq action chains: */
- extern int handle_IRQ_event(unsigned int irq, struct irqaction *action);
- /*
- * Built-in IRQ handlers for various IRQ types,
- * callable via desc->chip->handle_irq()
- */
- extern void fastcall handle_level_irq(unsigned int irq, struct irq_desc *desc);
- extern void fastcall handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
- extern void fastcall handle_edge_irq(unsigned int irq, struct irq_desc *desc);
- extern void fastcall handle_simple_irq(unsigned int irq, struct irq_desc *desc);
- extern void fastcall handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
- extern void fastcall handle_bad_irq(unsigned int irq, struct irq_desc *desc);
- /*
- * Monolithic do_IRQ implementation.
- * (is an explicit fastcall, because i386 4KSTACKS calls it from assembly)
- */
- #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
- extern fastcall unsigned int __do_IRQ(unsigned int irq);
- #endif
- /*
- * Architectures call this to let the generic IRQ layer
- * handle an interrupt. If the descriptor is attached to an
- * irqchip-style controller then we call the ->handle_irq() handler,
- * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
- */
- static inline void generic_handle_irq(unsigned int irq)
- {
- struct irq_desc *desc = irq_desc + irq;
- #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
- desc->handle_irq(irq, desc);
- #else
- if (likely(desc->handle_irq))
- desc->handle_irq(irq, desc);
- else
- __do_IRQ(irq);
- #endif
- }
- /* Handling of unhandled and spurious interrupts: */
- extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
- int action_ret);
- /* Resending of interrupts :*/
- void check_irq_resend(struct irq_desc *desc, unsigned int irq);
- /* Enable/disable irq debugging output: */
- extern int noirqdebug_setup(char *str);
- /* Checks whether the interrupt can be requested by request_irq(): */
- extern int can_request_irq(unsigned int irq, unsigned long irqflags);
- /* Dummy irq-chip implementations: */
- extern struct irq_chip no_irq_chip;
- extern struct irq_chip dummy_irq_chip;
- extern void
- set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
- irq_flow_handler_t handle);
- extern void
- set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
- irq_flow_handler_t handle, const char *name);
- extern void
- __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
- const char *name);
- /*
- * Set a highlevel flow handler for a given IRQ:
- */
- static inline void
- set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
- {
- __set_irq_handler(irq, handle, 0, NULL);
- }
- /*
- * Set a highlevel chained flow handler for a given IRQ.
- * (a chained handler is automatically enabled and set to
- * IRQ_NOREQUEST and IRQ_NOPROBE)
- */
- static inline void
- set_irq_chained_handler(unsigned int irq,
- irq_flow_handler_t handle)
- {
- __set_irq_handler(irq, handle, 1, NULL);
- }
- /* Handle dynamic irq creation and destruction */
- extern int create_irq(void);
- extern void destroy_irq(unsigned int irq);
- /* Test to see if a driver has successfully requested an irq */
- static inline int irq_has_action(unsigned int irq)
- {
- struct irq_desc *desc = irq_desc + irq;
- return desc->action != NULL;
- }
- /* Dynamic irq helper functions */
- extern void dynamic_irq_init(unsigned int irq);
- extern void dynamic_irq_cleanup(unsigned int irq);
- /* Set/get chip/data for an IRQ: */
- extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
- extern int set_irq_data(unsigned int irq, void *data);
- extern int set_irq_chip_data(unsigned int irq, void *data);
- extern int set_irq_type(unsigned int irq, unsigned int type);
- extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
- #define get_irq_chip(irq) (irq_desc[irq].chip)
- #define get_irq_chip_data(irq) (irq_desc[irq].chip_data)
- #define get_irq_data(irq) (irq_desc[irq].handler_data)
- #define get_irq_msi(irq) (irq_desc[irq].msi_desc)
- #endif /* CONFIG_GENERIC_HARDIRQS */
- #endif /* !CONFIG_S390 */
- #endif /* _LINUX_IRQ_H */
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