200803dfe4
Anyone reporting a stuck IRQ should try these options. Its effectiveness varies we've found in the Fedora case. Quite a few systems with misdescribed IRQ routing just work when you use irqpoll. It also fixes up the VIA systems although thats now fixed with the VIA quirk (which we could just make default as its what Redmond OS does but Linus didn't like it historically). A small number of systems have jammed IRQ sources or misdescribes that cause an IRQ that we have no handler registered anywhere for. In those cases it doesn't help. Signed-off-by: Alan Cox <number6@the-village.bc.nu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
101 lines
3 KiB
C
101 lines
3 KiB
C
#ifndef __irq_h
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#define __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/config.h>
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#if !defined(CONFIG_ARCH_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 <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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#define IRQ_PER_CPU 256 /* IRQ is per CPU */
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/*
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* Interrupt controller descriptor. This is all we need
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* to describe about the low-level hardware.
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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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/* 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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/*
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* This is the "IRQ descriptor", which contains various information
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* about the irq, including what kind of hardware handling it has,
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* whether it is disabled etc etc.
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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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typedef struct irq_desc {
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hw_irq_controller *handler;
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void *handler_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 interrupts */
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unsigned int irqs_unhandled;
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spinlock_t lock;
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} ____cacheline_aligned irq_desc_t;
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extern irq_desc_t irq_desc [NR_IRQS];
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#include <asm/hw_irq.h> /* the arch dependent stuff */
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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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extern cpumask_t irq_affinity[NR_IRQS];
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extern int no_irq_affinity;
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extern int noirqdebug_setup(char *str);
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extern fastcall int handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
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struct irqaction *action);
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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, irq_desc_t *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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extern void init_irq_proc(void);
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#endif
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extern hw_irq_controller no_irq_type; /* needed in every arch ? */
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#endif
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#endif /* __irq_h */
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