3418d72404
Introduce IRQ_NOPROBE: enables platforms to control chip-probing. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
262 lines
6.9 KiB
C
262 lines
6.9 KiB
C
#ifndef _LINUX_IRQ_H
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#define _LINUX_IRQ_H
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/*
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* Please do not include this file in generic code. There is currently
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* no requirement for any architecture to implement anything held
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* within this file.
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*
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* Thanks. --rmk
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*/
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#include <linux/smp.h>
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#ifndef CONFIG_S390
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#include <linux/linkage.h>
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#include <linux/cache.h>
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#include <linux/spinlock.h>
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#include <linux/cpumask.h>
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#include <linux/irqreturn.h>
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#include <asm/irq.h>
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#include <asm/ptrace.h>
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/*
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* IRQ line status.
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*/
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#define IRQ_INPROGRESS 1 /* IRQ handler active - do not enter! */
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#define IRQ_DISABLED 2 /* IRQ disabled - do not enter! */
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#define IRQ_PENDING 4 /* IRQ pending - replay on enable */
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#define IRQ_REPLAY 8 /* IRQ has been replayed but not acked yet */
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#define IRQ_AUTODETECT 16 /* IRQ is being autodetected */
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#define IRQ_WAITING 32 /* IRQ not yet seen - for autodetection */
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#define IRQ_LEVEL 64 /* IRQ level triggered */
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#define IRQ_MASKED 128 /* IRQ masked - shouldn't be seen again */
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#ifdef CONFIG_IRQ_PER_CPU
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# define IRQ_PER_CPU 256 /* IRQ is per CPU */
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# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
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#else
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# define CHECK_IRQ_PER_CPU(var) 0
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#endif
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#define IRQ_NOPROBE 512 /* IRQ is not valid for probing */
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/**
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* struct hw_interrupt_type - hardware interrupt type descriptor
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*
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* @name: name for /proc/interrupts
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* @startup: start up the interrupt (defaults to ->enable if NULL)
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* @shutdown: shut down the interrupt (defaults to ->disable if NULL)
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* @enable: enable the interrupt (defaults to chip->unmask if NULL)
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* @disable: disable the interrupt (defaults to chip->mask if NULL)
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* @handle_irq: irq flow handler called from the arch IRQ glue code
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* @ack: start of a new interrupt
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* @mask: mask an interrupt source
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* @mask_ack: ack and mask an interrupt source
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* @unmask: unmask an interrupt source
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* @hold: same interrupt while the handler is running
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* @end: end of interrupt
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* @set_affinity: set the CPU affinity on SMP machines
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* @retrigger: resend an IRQ to the CPU
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* @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
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* @set_wake: enable/disable power-management wake-on of an IRQ
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*
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* @release: release function solely used by UML
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*/
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struct hw_interrupt_type {
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const char *typename;
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unsigned int (*startup)(unsigned int irq);
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void (*shutdown)(unsigned int irq);
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void (*enable)(unsigned int irq);
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void (*disable)(unsigned int irq);
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void (*ack)(unsigned int irq);
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void (*end)(unsigned int irq);
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void (*set_affinity)(unsigned int irq, cpumask_t dest);
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int (*retrigger)(unsigned int irq);
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/* Currently used only by UML, might disappear one day.*/
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#ifdef CONFIG_IRQ_RELEASE_METHOD
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void (*release)(unsigned int irq, void *dev_id);
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#endif
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};
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typedef struct hw_interrupt_type hw_irq_controller;
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struct proc_dir_entry;
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/**
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* struct irq_desc - interrupt descriptor
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*
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* @handler: interrupt type dependent handler functions
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* @handler_data: data for the type handlers
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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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* @irq_count: stats field to detect stalled irqs
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* @irqs_unhandled: stats field for spurious unhandled interrupts
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* @lock: locking for SMP
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* @affinity: IRQ affinity on SMP
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* @pending_mask: pending rebalanced interrupts
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* @move_irq: need to re-target IRQ destination
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* @dir: /proc/irq/ procfs entry
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* @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP
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*
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* Pad this out to 32 bytes for cache and indexing reasons.
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*/
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struct irq_desc {
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hw_irq_controller *chip;
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void *chip_data;
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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 irq_count; /* For detecting broken IRQs */
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unsigned int irqs_unhandled;
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spinlock_t lock;
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#ifdef CONFIG_SMP
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cpumask_t affinity;
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#endif
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#if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
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cpumask_t pending_mask;
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unsigned int move_irq; /* need to re-target IRQ dest */
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#endif
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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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} ____cacheline_aligned;
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extern struct irq_desc irq_desc[NR_IRQS];
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/*
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* Migration helpers for obsolete names, they will go away:
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*/
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typedef struct irq_desc irq_desc_t;
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/*
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* Pick up the arch-dependent methods:
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*/
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#include <asm/hw_irq.h>
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extern int setup_irq(unsigned int irq, struct irqaction *new);
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#ifdef CONFIG_GENERIC_HARDIRQS
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#ifdef CONFIG_SMP
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static inline void set_native_irq_info(int irq, cpumask_t mask)
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{
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irq_desc[irq].affinity = mask;
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}
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#else
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static inline void set_native_irq_info(int irq, cpumask_t mask)
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{
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}
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#endif
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#ifdef CONFIG_SMP
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#if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
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void set_pending_irq(unsigned int irq, cpumask_t mask);
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void move_native_irq(int irq);
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#ifdef CONFIG_PCI_MSI
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/*
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* Wonder why these are dummies?
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* For e.g the set_ioapic_affinity_vector() calls the set_ioapic_affinity_irq()
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* counter part after translating the vector to irq info. We need to perform
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* this operation on the real irq, when we dont use vector, i.e when
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* pci_use_vector() is false.
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*/
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static inline void move_irq(int irq)
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{
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}
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static inline void set_irq_info(int irq, cpumask_t mask)
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{
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}
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#else /* CONFIG_PCI_MSI */
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static inline void move_irq(int irq)
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{
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move_native_irq(irq);
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}
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static inline void set_irq_info(int irq, cpumask_t mask)
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{
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set_native_irq_info(irq, mask);
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}
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#endif /* CONFIG_PCI_MSI */
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#else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */
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static inline void move_irq(int irq)
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{
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}
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static inline void move_native_irq(int irq)
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{
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}
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static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
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{
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}
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static inline void set_irq_info(int irq, cpumask_t mask)
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{
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set_native_irq_info(irq, mask);
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}
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#endif /* CONFIG_GENERIC_PENDING_IRQ */
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#else /* CONFIG_SMP */
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#define move_irq(x)
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#define move_native_irq(x)
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#endif /* CONFIG_SMP */
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#ifdef CONFIG_IRQBALANCE
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extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask);
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#else
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static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
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{
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}
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#endif
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#ifdef CONFIG_AUTO_IRQ_AFFINITY
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extern int select_smp_affinity(unsigned int irq);
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#else
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static inline int select_smp_affinity(unsigned int irq)
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{
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return 1;
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}
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#endif
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extern int no_irq_affinity;
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extern int noirqdebug_setup(char *str);
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extern irqreturn_t handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
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struct irqaction *action);
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/*
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* Explicit fastcall, because i386 4KSTACKS calls it from assembly:
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*/
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extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);
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extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
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int action_ret, struct pt_regs *regs);
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extern int can_request_irq(unsigned int irq, unsigned long irqflags);
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/* Resending of interrupts :*/
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void check_irq_resend(struct irq_desc *desc, unsigned int irq);
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extern void init_irq_proc(void);
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#endif /* CONFIG_GENERIC_HARDIRQS */
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extern hw_irq_controller no_irq_type; /* needed in every arch ? */
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#endif /* !CONFIG_S390 */
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#endif /* _LINUX_IRQ_H */
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