dbce706e25
With Chris Wedgwood <cw@f00f.org> Currently UML must explicitly call the UML-specific free_irq_by_irq_and_dev() for each free_irq call it's done. This is needed because ->shutdown and/or ->disable are only called when the last "action" for that irq is removed. Instead, for UML shared IRQs (UML IRQs are very often, if not always, shared), for each dev_id some setup is done, which must be cleared on the release of that fd. For instance, for each open console a new instance (i.e. new dev_id) of the same IRQ is requested(). Exactly, a fd is stored in an array (pollfds), which is after read by a host thread and passed to poll(). Each event registered by poll() triggers an interrupt. So, for each free_irq() we must remove the corresponding host fd from the table, which we do via this -release() method. In this patch we add an appropriate hook for this, and remove all uses of it by pointing the hook to the said procedure; this is safe to do since the said procedure. Also some cosmetic improvements are included. This is heavily based on some work by Chris Wedgwood, which however didn't get the patch merged for something I'd call a "misunderstanding" (the need for this patch wasn't cleanly explained, thus adding the generic hook was felt as undesirable). Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> CC: Ingo Molnar <mingo@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
99 lines
2.9 KiB
C
99 lines
2.9 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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void (*release)(unsigned int irq, void *dev_id);
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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, int action_ret);
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extern void report_bad_irq(unsigned int irq, irq_desc_t *desc, int action_ret);
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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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