| #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/irqnr.h> |
| #include <linux/errno.h> |
| #include <linux/wait.h> |
| |
| #include <asm/irq.h> |
| #include <asm/ptrace.h> |
| #include <asm/irq_regs.h> |
| |
| struct irq_desc; |
| typedef void (*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 */ |
| #define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */ |
| #define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */ |
| #define IRQ_AFFINITY_SET 0x02000000 /* IRQ affinity was set from userspace*/ |
| |
| #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, |
| const struct cpumask *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 timer_rand_state; |
| struct irq_2_iommu; |
| /** |
| * struct irq_desc - interrupt descriptor |
| * @irq: interrupt number for this descriptor |
| * @timer_rand_state: pointer to timer rand state struct |
| * @kstat_irqs: irq stats per cpu |
| * @irq_2_iommu: iommu with this irq |
| * @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 |
| * @last_unhandled: aging timer for unhandled count |
| * @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 |
| * @threads_active: number of irqaction threads currently running |
| * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers |
| * @dir: /proc/irq/ procfs entry |
| * @name: flow handler name for /proc/interrupts output |
| */ |
| struct irq_desc { |
| unsigned int irq; |
| struct timer_rand_state *timer_rand_state; |
| unsigned int *kstat_irqs; |
| #ifdef CONFIG_INTR_REMAP |
| struct irq_2_iommu *irq_2_iommu; |
| #endif |
| 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 long last_unhandled; /* Aging timer for unhandled count */ |
| unsigned int irqs_unhandled; |
| spinlock_t lock; |
| #ifdef CONFIG_SMP |
| cpumask_var_t affinity; |
| unsigned int cpu; |
| #ifdef CONFIG_GENERIC_PENDING_IRQ |
| cpumask_var_t pending_mask; |
| #endif |
| #endif |
| atomic_t threads_active; |
| wait_queue_head_t wait_for_threads; |
| #ifdef CONFIG_PROC_FS |
| struct proc_dir_entry *dir; |
| #endif |
| const char *name; |
| } ____cacheline_internodealigned_in_smp; |
| |
| extern void arch_init_copy_chip_data(struct irq_desc *old_desc, |
| struct irq_desc *desc, int cpu); |
| extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc); |
| |
| #ifndef CONFIG_SPARSE_IRQ |
| extern struct irq_desc irq_desc[NR_IRQS]; |
| #else /* CONFIG_SPARSE_IRQ */ |
| extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int cpu); |
| #endif /* CONFIG_SPARSE_IRQ */ |
| |
| extern struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu); |
| |
| static inline struct irq_desc * |
| irq_remap_to_desc(unsigned int irq, struct irq_desc *desc) |
| { |
| #ifdef CONFIG_NUMA_MIGRATE_IRQ_DESC |
| return irq_to_desc(irq); |
| #else |
| return desc; |
| #endif |
| } |
| |
| /* |
| * Migration helpers for obsolete names, they will go away: |
| */ |
| #define hw_interrupt_type irq_chip |
| #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); |
| extern void remove_irq(unsigned int irq, struct irqaction *act); |
| |
| #ifdef CONFIG_GENERIC_HARDIRQS |
| |
| #ifdef CONFIG_SMP |
| |
| #ifdef CONFIG_GENERIC_PENDING_IRQ |
| |
| void move_native_irq(int irq); |
| void move_masked_irq(int irq); |
| |
| #else /* CONFIG_GENERIC_PENDING_IRQ */ |
| |
| static inline void move_irq(int irq) |
| { |
| } |
| |
| static inline void move_native_irq(int irq) |
| { |
| } |
| |
| static inline void move_masked_irq(int irq) |
| { |
| } |
| |
| #endif /* CONFIG_GENERIC_PENDING_IRQ */ |
| |
| #else /* CONFIG_SMP */ |
| |
| #define move_native_irq(x) |
| #define move_masked_irq(x) |
| |
| #endif /* CONFIG_SMP */ |
| |
| extern int no_irq_affinity; |
| |
| static inline int irq_balancing_disabled(unsigned int irq) |
| { |
| struct irq_desc *desc; |
| |
| desc = irq_to_desc(irq); |
| return desc->status & IRQ_NO_BALANCING_MASK; |
| } |
| |
| /* Handle irq action chains: */ |
| extern irqreturn_t 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 handle_level_irq(unsigned int irq, struct irq_desc *desc); |
| extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc); |
| extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc); |
| extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc); |
| extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc); |
| extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc); |
| |
| /* |
| * Monolithic do_IRQ implementation. |
| */ |
| #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ |
| extern 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_desc(unsigned int irq, struct irq_desc *desc) |
| { |
| #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 |
| } |
| |
| static inline void generic_handle_irq(unsigned int irq) |
| { |
| generic_handle_irq_desc(irq, irq_to_desc(irq)); |
| } |
| |
| /* Handling of unhandled and spurious interrupts: */ |
| extern void note_interrupt(unsigned int irq, struct irq_desc *desc, |
| irqreturn_t 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); |
| |
| /* caller has locked the irq_desc and both params are valid */ |
| static inline void __set_irq_handler_unlocked(int irq, |
| irq_flow_handler_t handler) |
| { |
| struct irq_desc *desc; |
| |
| desc = irq_to_desc(irq); |
| desc->handle_irq = handler; |
| } |
| |
| /* |
| * 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); |
| } |
| |
| extern void set_irq_noprobe(unsigned int irq); |
| extern void set_irq_probe(unsigned int irq); |
| |
| /* Handle dynamic irq creation and destruction */ |
| extern unsigned int create_irq_nr(unsigned int irq_want); |
| 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_to_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_to_desc(irq)->chip) |
| #define get_irq_chip_data(irq) (irq_to_desc(irq)->chip_data) |
| #define get_irq_data(irq) (irq_to_desc(irq)->handler_data) |
| #define get_irq_msi(irq) (irq_to_desc(irq)->msi_desc) |
| |
| #define get_irq_desc_chip(desc) ((desc)->chip) |
| #define get_irq_desc_chip_data(desc) ((desc)->chip_data) |
| #define get_irq_desc_data(desc) ((desc)->handler_data) |
| #define get_irq_desc_msi(desc) ((desc)->msi_desc) |
| |
| #endif /* CONFIG_GENERIC_HARDIRQS */ |
| |
| #endif /* !CONFIG_S390 */ |
| |
| #ifdef CONFIG_SMP |
| /** |
| * init_alloc_desc_masks - allocate cpumasks for irq_desc |
| * @desc: pointer to irq_desc struct |
| * @cpu: cpu which will be handling the cpumasks |
| * @boot: true if need bootmem |
| * |
| * Allocates affinity and pending_mask cpumask if required. |
| * Returns true if successful (or not required). |
| * Side effect: affinity has all bits set, pending_mask has all bits clear. |
| */ |
| static inline bool init_alloc_desc_masks(struct irq_desc *desc, int cpu, |
| bool boot) |
| { |
| int node; |
| |
| if (boot) { |
| alloc_bootmem_cpumask_var(&desc->affinity); |
| cpumask_setall(desc->affinity); |
| |
| #ifdef CONFIG_GENERIC_PENDING_IRQ |
| alloc_bootmem_cpumask_var(&desc->pending_mask); |
| cpumask_clear(desc->pending_mask); |
| #endif |
| return true; |
| } |
| |
| node = cpu_to_node(cpu); |
| |
| if (!alloc_cpumask_var_node(&desc->affinity, GFP_ATOMIC, node)) |
| return false; |
| cpumask_setall(desc->affinity); |
| |
| #ifdef CONFIG_GENERIC_PENDING_IRQ |
| if (!alloc_cpumask_var_node(&desc->pending_mask, GFP_ATOMIC, node)) { |
| free_cpumask_var(desc->affinity); |
| return false; |
| } |
| cpumask_clear(desc->pending_mask); |
| #endif |
| return true; |
| } |
| |
| /** |
| * init_copy_desc_masks - copy cpumasks for irq_desc |
| * @old_desc: pointer to old irq_desc struct |
| * @new_desc: pointer to new irq_desc struct |
| * |
| * Insures affinity and pending_masks are copied to new irq_desc. |
| * If !CONFIG_CPUMASKS_OFFSTACK the cpumasks are embedded in the |
| * irq_desc struct so the copy is redundant. |
| */ |
| |
| static inline void init_copy_desc_masks(struct irq_desc *old_desc, |
| struct irq_desc *new_desc) |
| { |
| #ifdef CONFIG_CPUMASKS_OFFSTACK |
| cpumask_copy(new_desc->affinity, old_desc->affinity); |
| |
| #ifdef CONFIG_GENERIC_PENDING_IRQ |
| cpumask_copy(new_desc->pending_mask, old_desc->pending_mask); |
| #endif |
| #endif |
| } |
| |
| #else /* !CONFIG_SMP */ |
| |
| static inline bool init_alloc_desc_masks(struct irq_desc *desc, int cpu, |
| bool boot) |
| { |
| return true; |
| } |
| |
| static inline void init_copy_desc_masks(struct irq_desc *old_desc, |
| struct irq_desc *new_desc) |
| { |
| } |
| |
| #endif /* CONFIG_SMP */ |
| |
| #endif /* _LINUX_IRQ_H */ |