168 lines
4.7 KiB
C
168 lines
4.7 KiB
C
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#ifndef _LINUX_IRQDESC_H
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#define _LINUX_IRQDESC_H
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/*
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* Core internal functions to deal with irq descriptors
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*
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* This include will move to kernel/irq once we cleaned up the tree.
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* For now it's included from <linux/irq.h>
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*/
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struct proc_dir_entry;
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struct timer_rand_state;
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/**
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* struct irq_desc - interrupt descriptor
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* @irq_data: per irq and chip data passed down to chip functions
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* @timer_rand_state: pointer to timer rand state struct
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* @kstat_irqs: irq stats per cpu
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* @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()]
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* @action: the irq action chain
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* @status: status information
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* @depth: disable-depth, for nested irq_disable() calls
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* @wake_depth: enable depth, for multiple set_irq_wake() callers
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* @irq_count: stats field to detect stalled irqs
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* @last_unhandled: aging timer for unhandled count
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* @irqs_unhandled: stats field for spurious unhandled interrupts
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* @lock: locking for SMP
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* @pending_mask: pending rebalanced interrupts
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* @threads_active: number of irqaction threads currently running
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* @wait_for_threads: wait queue for sync_irq to wait for threaded handlers
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* @dir: /proc/irq/ procfs entry
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* @name: flow handler name for /proc/interrupts output
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*/
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struct irq_desc {
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#ifdef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
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struct irq_data irq_data;
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#else
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/*
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* This union will go away, once we fixed the direct access to
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* irq_desc all over the place. The direct fields are a 1:1
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* overlay of irq_data.
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*/
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union {
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struct irq_data irq_data;
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struct {
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unsigned int irq;
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unsigned int node;
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struct irq_chip *chip;
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void *handler_data;
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void *chip_data;
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struct msi_desc *msi_desc;
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#ifdef CONFIG_SMP
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cpumask_var_t affinity;
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#endif
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};
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};
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#endif
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struct timer_rand_state *timer_rand_state;
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unsigned int *kstat_irqs;
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irq_flow_handler_t handle_irq;
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struct irqaction *action; /* IRQ action list */
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unsigned int status; /* IRQ status */
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unsigned int depth; /* nested irq disables */
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unsigned int wake_depth; /* nested wake enables */
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unsigned int irq_count; /* For detecting broken IRQs */
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unsigned long last_unhandled; /* Aging timer for unhandled count */
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unsigned int irqs_unhandled;
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raw_spinlock_t lock;
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#ifdef CONFIG_SMP
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const struct cpumask *affinity_hint;
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#ifdef CONFIG_GENERIC_PENDING_IRQ
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cpumask_var_t pending_mask;
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#endif
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#endif
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atomic_t threads_active;
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wait_queue_head_t wait_for_threads;
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#ifdef CONFIG_PROC_FS
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struct proc_dir_entry *dir;
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#endif
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const char *name;
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} ____cacheline_internodealigned_in_smp;
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extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
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struct irq_desc *desc, int node);
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extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc);
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#ifndef CONFIG_SPARSE_IRQ
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extern struct irq_desc irq_desc[NR_IRQS];
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#endif
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#ifdef CONFIG_NUMA_IRQ_DESC
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extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int node);
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#else
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static inline struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
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{
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return desc;
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}
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#endif
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extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node);
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#ifdef CONFIG_GENERIC_HARDIRQS
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#define get_irq_desc_chip(desc) ((desc)->irq_data.chip)
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#define get_irq_desc_chip_data(desc) ((desc)->irq_data.chip_data)
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#define get_irq_desc_data(desc) ((desc)->irq_data.handler_data)
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#define get_irq_desc_msi(desc) ((desc)->irq_data.msi_desc)
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/*
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* Monolithic do_IRQ implementation.
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*/
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#ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
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extern unsigned int __do_IRQ(unsigned int irq);
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#endif
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/*
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* Architectures call this to let the generic IRQ layer
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* handle an interrupt. If the descriptor is attached to an
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* irqchip-style controller then we call the ->handle_irq() handler,
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* and it calls __do_IRQ() if it's attached to an irqtype-style controller.
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*/
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static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
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{
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#ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
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desc->handle_irq(irq, desc);
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#else
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if (likely(desc->handle_irq))
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desc->handle_irq(irq, desc);
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else
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__do_IRQ(irq);
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#endif
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}
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static inline void generic_handle_irq(unsigned int irq)
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{
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generic_handle_irq_desc(irq, irq_to_desc(irq));
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}
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/* Test to see if a driver has successfully requested an irq */
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static inline int irq_has_action(unsigned int irq)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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return desc->action != NULL;
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}
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static inline int irq_balancing_disabled(unsigned int irq)
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{
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struct irq_desc *desc;
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desc = irq_to_desc(irq);
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return desc->status & IRQ_NO_BALANCING_MASK;
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}
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/* caller has locked the irq_desc and both params are valid */
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static inline void __set_irq_handler_unlocked(int irq,
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irq_flow_handler_t handler)
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{
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struct irq_desc *desc;
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desc = irq_to_desc(irq);
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desc->handle_irq = handler;
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}
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#endif
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#endif
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