![Robert P. J. Day](/assets/img/avatar_default.png)
Run this: #!/bin/sh for f in $(grep -Erl "\([^\)]*\) *k[cmz]alloc" *) ; do echo "De-casting $f..." perl -pi -e "s/ ?= ?\([^\)]*\) *(k[cmz]alloc) *\(/ = \1\(/" $f done And then go through and reinstate those cases where code is casting pointers to non-pointers. And then drop a few hunks which conflicted with outstanding work. Cc: Russell King <rmk@arm.linux.org.uk>, Ian Molton <spyro@f2s.com> Cc: Mikael Starvik <starvik@axis.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Greg KH <greg@kroah.com> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Paul Fulghum <paulkf@microgate.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Karsten Keil <kkeil@suse.de> Cc: Mauro Carvalho Chehab <mchehab@infradead.org> Cc: Jeff Garzik <jeff@garzik.org> Cc: James Bottomley <James.Bottomley@steeleye.com> Cc: Ian Kent <raven@themaw.net> Cc: Steven French <sfrench@us.ibm.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Neil Brown <neilb@cse.unsw.edu.au> Cc: Jaroslav Kysela <perex@suse.cz> Cc: Takashi Iwai <tiwai@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
717 lines
17 KiB
C
717 lines
17 KiB
C
/*
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* linux/arch/arm/kernel/irq.c
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*
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* Copyright (C) 1992 Linus Torvalds
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* Modifications for ARM processor Copyright (C) 1995-2000 Russell King.
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* 'Borrowed' for ARM26 and (C) 2003 Ian Molton.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This file contains the code used by various IRQ handling routines:
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* asking for different IRQ's should be done through these routines
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* instead of just grabbing them. Thus setups with different IRQ numbers
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* shouldn't result in any weird surprises, and installing new handlers
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* should be easier.
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*
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* IRQ's are in fact implemented a bit like signal handlers for the kernel.
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* Naturally it's not a 1:1 relation, but there are similarities.
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*/
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#include <linux/module.h>
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#include <linux/ptrace.h>
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#include <linux/kernel_stat.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/ioport.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/random.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/seq_file.h>
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#include <linux/errno.h>
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#include <asm/irq.h>
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#include <asm/system.h>
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#include <asm/irqchip.h>
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//FIXME - this ought to be in a header IMO
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void __init arc_init_irq(void);
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/*
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* Maximum IRQ count. Currently, this is arbitary. However, it should
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* not be set too low to prevent false triggering. Conversely, if it
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* is set too high, then you could miss a stuck IRQ.
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*
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* FIXME Maybe we ought to set a timer and re-enable the IRQ at a later time?
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*/
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#define MAX_IRQ_CNT 100000
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static volatile unsigned long irq_err_count;
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static DEFINE_SPINLOCK(irq_controller_lock);
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struct irqdesc irq_desc[NR_IRQS];
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/*
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* Dummy mask/unmask handler
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*/
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void dummy_mask_unmask_irq(unsigned int irq)
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{
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}
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void do_bad_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
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{
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irq_err_count += 1;
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printk(KERN_ERR "IRQ: spurious interrupt %d\n", irq);
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}
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static struct irqchip bad_chip = {
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.ack = dummy_mask_unmask_irq,
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.mask = dummy_mask_unmask_irq,
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.unmask = dummy_mask_unmask_irq,
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};
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static struct irqdesc bad_irq_desc = {
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.chip = &bad_chip,
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.handle = do_bad_IRQ,
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.depth = 1,
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};
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/**
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* disable_irq - disable an irq and wait for completion
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* @irq: Interrupt to disable
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*
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* Disable the selected interrupt line. We do this lazily.
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*
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* This function may be called from IRQ context.
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*/
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void disable_irq(unsigned int irq)
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{
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struct irqdesc *desc = irq_desc + irq;
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unsigned long flags;
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spin_lock_irqsave(&irq_controller_lock, flags);
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if (!desc->depth++)
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desc->enabled = 0;
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spin_unlock_irqrestore(&irq_controller_lock, flags);
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}
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/**
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* enable_irq - enable interrupt handling on an irq
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* @irq: Interrupt to enable
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*
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* Re-enables the processing of interrupts on this IRQ line.
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* Note that this may call the interrupt handler, so you may
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* get unexpected results if you hold IRQs disabled.
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*
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* This function may be called from IRQ context.
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*/
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void enable_irq(unsigned int irq)
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{
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struct irqdesc *desc = irq_desc + irq;
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unsigned long flags;
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int pending = 0;
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spin_lock_irqsave(&irq_controller_lock, flags);
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if (unlikely(!desc->depth)) {
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printk("enable_irq(%u) unbalanced from %p\n", irq,
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__builtin_return_address(0)); //FIXME bum addresses reported - why?
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} else if (!--desc->depth) {
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desc->probing = 0;
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desc->enabled = 1;
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desc->chip->unmask(irq);
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pending = desc->pending;
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desc->pending = 0;
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/*
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* If the interrupt was waiting to be processed,
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* retrigger it.
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*/
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if (pending)
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desc->chip->rerun(irq);
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}
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spin_unlock_irqrestore(&irq_controller_lock, flags);
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}
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int show_interrupts(struct seq_file *p, void *v)
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{
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int i = *(loff_t *) v;
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struct irqaction * action;
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if (i < NR_IRQS) {
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action = irq_desc[i].action;
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if (!action)
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goto out;
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seq_printf(p, "%3d: %10u ", i, kstat_irqs(i));
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seq_printf(p, " %s", action->name);
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for (action = action->next; action; action = action->next) {
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seq_printf(p, ", %s", action->name);
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}
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seq_putc(p, '\n');
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} else if (i == NR_IRQS) {
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show_fiq_list(p, v);
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seq_printf(p, "Err: %10lu\n", irq_err_count);
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}
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out:
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return 0;
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}
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/*
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* IRQ lock detection.
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*
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* Hopefully, this should get us out of a few locked situations.
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* However, it may take a while for this to happen, since we need
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* a large number if IRQs to appear in the same jiffie with the
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* same instruction pointer (or within 2 instructions).
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*/
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static int check_irq_lock(struct irqdesc *desc, int irq, struct pt_regs *regs)
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{
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unsigned long instr_ptr = instruction_pointer(regs);
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if (desc->lck_jif == jiffies &&
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desc->lck_pc >= instr_ptr && desc->lck_pc < instr_ptr + 8) {
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desc->lck_cnt += 1;
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if (desc->lck_cnt > MAX_IRQ_CNT) {
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printk(KERN_ERR "IRQ LOCK: IRQ%d is locking the system, disabled\n", irq);
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return 1;
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}
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} else {
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desc->lck_cnt = 0;
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desc->lck_pc = instruction_pointer(regs);
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desc->lck_jif = jiffies;
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}
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return 0;
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}
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static void
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__do_irq(unsigned int irq, struct irqaction *action, struct pt_regs *regs)
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{
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unsigned int status;
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int ret;
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spin_unlock(&irq_controller_lock);
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if (!(action->flags & IRQF_DISABLED))
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local_irq_enable();
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status = 0;
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do {
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ret = action->handler(irq, action->dev_id, regs);
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if (ret == IRQ_HANDLED)
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status |= action->flags;
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action = action->next;
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} while (action);
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if (status & IRQF_SAMPLE_RANDOM)
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add_interrupt_randomness(irq);
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spin_lock_irq(&irq_controller_lock);
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}
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/*
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* This is for software-decoded IRQs. The caller is expected to
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* handle the ack, clear, mask and unmask issues.
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*/
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void
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do_simple_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
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{
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struct irqaction *action;
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const int cpu = smp_processor_id();
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desc->triggered = 1;
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kstat_cpu(cpu).irqs[irq]++;
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action = desc->action;
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if (action)
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__do_irq(irq, desc->action, regs);
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}
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/*
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* Most edge-triggered IRQ implementations seem to take a broken
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* approach to this. Hence the complexity.
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*/
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void
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do_edge_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
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{
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const int cpu = smp_processor_id();
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desc->triggered = 1;
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/*
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* If we're currently running this IRQ, or its disabled,
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* we shouldn't process the IRQ. Instead, turn on the
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* hardware masks.
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*/
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if (unlikely(desc->running || !desc->enabled))
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goto running;
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/*
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* Acknowledge and clear the IRQ, but don't mask it.
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*/
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desc->chip->ack(irq);
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/*
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* Mark the IRQ currently in progress.
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*/
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desc->running = 1;
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kstat_cpu(cpu).irqs[irq]++;
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do {
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struct irqaction *action;
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action = desc->action;
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if (!action)
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break;
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if (desc->pending && desc->enabled) {
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desc->pending = 0;
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desc->chip->unmask(irq);
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}
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__do_irq(irq, action, regs);
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} while (desc->pending);
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desc->running = 0;
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/*
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* If we were disabled or freed, shut down the handler.
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*/
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if (likely(desc->action && !check_irq_lock(desc, irq, regs)))
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return;
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running:
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/*
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* We got another IRQ while this one was masked or
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* currently running. Delay it.
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*/
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desc->pending = 1;
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desc->chip->mask(irq);
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desc->chip->ack(irq);
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}
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/*
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* Level-based IRQ handler. Nice and simple.
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*/
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void
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do_level_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
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{
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struct irqaction *action;
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const int cpu = smp_processor_id();
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desc->triggered = 1;
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/*
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* Acknowledge, clear _AND_ disable the interrupt.
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*/
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desc->chip->ack(irq);
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if (likely(desc->enabled)) {
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kstat_cpu(cpu).irqs[irq]++;
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/*
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* Return with this interrupt masked if no action
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*/
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action = desc->action;
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if (action) {
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__do_irq(irq, desc->action, regs);
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if (likely(desc->enabled &&
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!check_irq_lock(desc, irq, regs)))
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desc->chip->unmask(irq);
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}
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}
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}
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/*
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* do_IRQ handles all hardware IRQ's. Decoded IRQs should not
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* come via this function. Instead, they should provide their
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* own 'handler'
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*/
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asmlinkage void asm_do_IRQ(int irq, struct pt_regs *regs)
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{
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struct irqdesc *desc = irq_desc + irq;
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/*
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* Some hardware gives randomly wrong interrupts. Rather
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* than crashing, do something sensible.
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*/
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if (irq >= NR_IRQS)
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desc = &bad_irq_desc;
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irq_enter();
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spin_lock(&irq_controller_lock);
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desc->handle(irq, desc, regs);
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spin_unlock(&irq_controller_lock);
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irq_exit();
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}
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void __set_irq_handler(unsigned int irq, irq_handler_t handle, int is_chained)
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{
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struct irqdesc *desc;
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unsigned long flags;
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if (irq >= NR_IRQS) {
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printk(KERN_ERR "Trying to install handler for IRQ%d\n", irq);
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return;
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}
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if (handle == NULL)
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handle = do_bad_IRQ;
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desc = irq_desc + irq;
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if (is_chained && desc->chip == &bad_chip)
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printk(KERN_WARNING "Trying to install chained handler for IRQ%d\n", irq);
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spin_lock_irqsave(&irq_controller_lock, flags);
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if (handle == do_bad_IRQ) {
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desc->chip->mask(irq);
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desc->chip->ack(irq);
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desc->depth = 1;
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desc->enabled = 0;
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}
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desc->handle = handle;
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if (handle != do_bad_IRQ && is_chained) {
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desc->valid = 0;
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desc->probe_ok = 0;
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desc->depth = 0;
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desc->chip->unmask(irq);
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}
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spin_unlock_irqrestore(&irq_controller_lock, flags);
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}
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void set_irq_chip(unsigned int irq, struct irqchip *chip)
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{
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struct irqdesc *desc;
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unsigned long flags;
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if (irq >= NR_IRQS) {
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printk(KERN_ERR "Trying to install chip for IRQ%d\n", irq);
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return;
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}
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if (chip == NULL)
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chip = &bad_chip;
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desc = irq_desc + irq;
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spin_lock_irqsave(&irq_controller_lock, flags);
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desc->chip = chip;
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spin_unlock_irqrestore(&irq_controller_lock, flags);
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}
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int set_irq_type(unsigned int irq, unsigned int type)
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{
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struct irqdesc *desc;
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unsigned long flags;
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int ret = -ENXIO;
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if (irq >= NR_IRQS) {
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printk(KERN_ERR "Trying to set irq type for IRQ%d\n", irq);
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return -ENODEV;
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}
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desc = irq_desc + irq;
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if (desc->chip->type) {
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spin_lock_irqsave(&irq_controller_lock, flags);
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ret = desc->chip->type(irq, type);
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spin_unlock_irqrestore(&irq_controller_lock, flags);
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}
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return ret;
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}
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void set_irq_flags(unsigned int irq, unsigned int iflags)
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{
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struct irqdesc *desc;
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unsigned long flags;
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if (irq >= NR_IRQS) {
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printk(KERN_ERR "Trying to set irq flags for IRQ%d\n", irq);
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return;
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}
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desc = irq_desc + irq;
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spin_lock_irqsave(&irq_controller_lock, flags);
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desc->valid = (iflags & IRQF_VALID) != 0;
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desc->probe_ok = (iflags & IRQF_PROBE) != 0;
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desc->noautoenable = (iflags & IRQF_NOAUTOEN) != 0;
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spin_unlock_irqrestore(&irq_controller_lock, flags);
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}
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int setup_irq(unsigned int irq, struct irqaction *new)
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{
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int shared = 0;
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struct irqaction *old, **p;
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unsigned long flags;
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struct irqdesc *desc;
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/*
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* Some drivers like serial.c use request_irq() heavily,
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* so we have to be careful not to interfere with a
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* running system.
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*/
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if (new->flags & IRQF_SAMPLE_RANDOM) {
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/*
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* This function might sleep, we want to call it first,
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* outside of the atomic block.
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* Yes, this might clear the entropy pool if the wrong
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* driver is attempted to be loaded, without actually
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* installing a new handler, but is this really a problem,
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* only the sysadmin is able to do this.
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*/
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rand_initialize_irq(irq);
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}
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/*
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* The following block of code has to be executed atomically
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*/
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desc = irq_desc + irq;
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spin_lock_irqsave(&irq_controller_lock, flags);
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p = &desc->action;
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if ((old = *p) != NULL) {
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/* Can't share interrupts unless both agree to */
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if (!(old->flags & new->flags & IRQF_SHARED)) {
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spin_unlock_irqrestore(&irq_controller_lock, flags);
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return -EBUSY;
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}
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/* add new interrupt at end of irq queue */
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do {
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p = &old->next;
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old = *p;
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} while (old);
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shared = 1;
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}
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*p = new;
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if (!shared) {
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desc->probing = 0;
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desc->running = 0;
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desc->pending = 0;
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desc->depth = 1;
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if (!desc->noautoenable) {
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desc->depth = 0;
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desc->enabled = 1;
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desc->chip->unmask(irq);
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}
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}
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spin_unlock_irqrestore(&irq_controller_lock, flags);
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return 0;
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}
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/**
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* request_irq - allocate an interrupt line
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* @irq: Interrupt line to allocate
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* @handler: Function to be called when the IRQ occurs
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* @irqflags: Interrupt type flags
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* @devname: An ascii name for the claiming device
|
|
* @dev_id: A cookie passed back to the handler function
|
|
*
|
|
* This call allocates interrupt resources and enables the
|
|
* interrupt line and IRQ handling. From the point this
|
|
* call is made your handler function may be invoked. Since
|
|
* your handler function must clear any interrupt the board
|
|
* raises, you must take care both to initialise your hardware
|
|
* and to set up the interrupt handler in the right order.
|
|
*
|
|
* Dev_id must be globally unique. Normally the address of the
|
|
* device data structure is used as the cookie. Since the handler
|
|
* receives this value it makes sense to use it.
|
|
*
|
|
* If your interrupt is shared you must pass a non NULL dev_id
|
|
* as this is required when freeing the interrupt.
|
|
*
|
|
* Flags:
|
|
*
|
|
* IRQF_SHARED Interrupt is shared
|
|
*
|
|
* IRQF_DISABLED Disable local interrupts while processing
|
|
*
|
|
* IRQF_SAMPLE_RANDOM The interrupt can be used for entropy
|
|
*
|
|
*/
|
|
|
|
//FIXME - handler used to return void - whats the significance of the change?
|
|
int request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *),
|
|
unsigned long irq_flags, const char * devname, void *dev_id)
|
|
{
|
|
unsigned long retval;
|
|
struct irqaction *action;
|
|
|
|
if (irq >= NR_IRQS || !irq_desc[irq].valid || !handler ||
|
|
(irq_flags & IRQF_SHARED && !dev_id))
|
|
return -EINVAL;
|
|
|
|
action = kmalloc(sizeof(struct irqaction), GFP_KERNEL);
|
|
if (!action)
|
|
return -ENOMEM;
|
|
|
|
action->handler = handler;
|
|
action->flags = irq_flags;
|
|
cpus_clear(action->mask);
|
|
action->name = devname;
|
|
action->next = NULL;
|
|
action->dev_id = dev_id;
|
|
|
|
retval = setup_irq(irq, action);
|
|
|
|
if (retval)
|
|
kfree(action);
|
|
return retval;
|
|
}
|
|
|
|
EXPORT_SYMBOL(request_irq);
|
|
|
|
/**
|
|
* free_irq - free an interrupt
|
|
* @irq: Interrupt line to free
|
|
* @dev_id: Device identity to free
|
|
*
|
|
* Remove an interrupt handler. The handler is removed and if the
|
|
* interrupt line is no longer in use by any driver it is disabled.
|
|
* On a shared IRQ the caller must ensure the interrupt is disabled
|
|
* on the card it drives before calling this function.
|
|
*
|
|
* This function may be called from interrupt context.
|
|
*/
|
|
void free_irq(unsigned int irq, void *dev_id)
|
|
{
|
|
struct irqaction * action, **p;
|
|
unsigned long flags;
|
|
|
|
if (irq >= NR_IRQS || !irq_desc[irq].valid) {
|
|
printk(KERN_ERR "Trying to free IRQ%d\n",irq);
|
|
#ifdef CONFIG_DEBUG_ERRORS
|
|
__backtrace();
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
spin_lock_irqsave(&irq_controller_lock, flags);
|
|
for (p = &irq_desc[irq].action; (action = *p) != NULL; p = &action->next) {
|
|
if (action->dev_id != dev_id)
|
|
continue;
|
|
|
|
/* Found it - now free it */
|
|
*p = action->next;
|
|
kfree(action);
|
|
goto out;
|
|
}
|
|
printk(KERN_ERR "Trying to free free IRQ%d\n",irq);
|
|
#ifdef CONFIG_DEBUG_ERRORS
|
|
__backtrace();
|
|
#endif
|
|
out:
|
|
spin_unlock_irqrestore(&irq_controller_lock, flags);
|
|
}
|
|
|
|
EXPORT_SYMBOL(free_irq);
|
|
|
|
/* Start the interrupt probing. Unlike other architectures,
|
|
* we don't return a mask of interrupts from probe_irq_on,
|
|
* but return the number of interrupts enabled for the probe.
|
|
* The interrupts which have been enabled for probing is
|
|
* instead recorded in the irq_desc structure.
|
|
*/
|
|
unsigned long probe_irq_on(void)
|
|
{
|
|
unsigned int i, irqs = 0;
|
|
unsigned long delay;
|
|
|
|
/*
|
|
* first snaffle up any unassigned but
|
|
* probe-able interrupts
|
|
*/
|
|
spin_lock_irq(&irq_controller_lock);
|
|
for (i = 0; i < NR_IRQS; i++) {
|
|
if (!irq_desc[i].probe_ok || irq_desc[i].action)
|
|
continue;
|
|
|
|
irq_desc[i].probing = 1;
|
|
irq_desc[i].triggered = 0;
|
|
if (irq_desc[i].chip->type)
|
|
irq_desc[i].chip->type(i, IRQT_PROBE);
|
|
irq_desc[i].chip->unmask(i);
|
|
irqs += 1;
|
|
}
|
|
spin_unlock_irq(&irq_controller_lock);
|
|
|
|
/*
|
|
* wait for spurious interrupts to mask themselves out again
|
|
*/
|
|
for (delay = jiffies + HZ/10; time_before(jiffies, delay); )
|
|
/* min 100ms delay */;
|
|
|
|
/*
|
|
* now filter out any obviously spurious interrupts
|
|
*/
|
|
spin_lock_irq(&irq_controller_lock);
|
|
for (i = 0; i < NR_IRQS; i++) {
|
|
if (irq_desc[i].probing && irq_desc[i].triggered) {
|
|
irq_desc[i].probing = 0;
|
|
irqs -= 1;
|
|
}
|
|
}
|
|
spin_unlock_irq(&irq_controller_lock);
|
|
|
|
return irqs;
|
|
}
|
|
|
|
EXPORT_SYMBOL(probe_irq_on);
|
|
|
|
/*
|
|
* Possible return values:
|
|
* >= 0 - interrupt number
|
|
* -1 - no interrupt/many interrupts
|
|
*/
|
|
int probe_irq_off(unsigned long irqs)
|
|
{
|
|
unsigned int i;
|
|
int irq_found = NO_IRQ;
|
|
|
|
/*
|
|
* look at the interrupts, and find exactly one
|
|
* that we were probing has been triggered
|
|
*/
|
|
spin_lock_irq(&irq_controller_lock);
|
|
for (i = 0; i < NR_IRQS; i++) {
|
|
if (irq_desc[i].probing &&
|
|
irq_desc[i].triggered) {
|
|
if (irq_found != NO_IRQ) {
|
|
irq_found = NO_IRQ;
|
|
goto out;
|
|
}
|
|
irq_found = i;
|
|
}
|
|
}
|
|
|
|
if (irq_found == -1)
|
|
irq_found = NO_IRQ;
|
|
out:
|
|
spin_unlock_irq(&irq_controller_lock);
|
|
|
|
return irq_found;
|
|
}
|
|
|
|
EXPORT_SYMBOL(probe_irq_off);
|
|
|
|
void __init init_irq_proc(void)
|
|
{
|
|
}
|
|
|
|
void __init init_IRQ(void)
|
|
{
|
|
struct irqdesc *desc;
|
|
extern void init_dma(void);
|
|
int irq;
|
|
|
|
for (irq = 0, desc = irq_desc; irq < NR_IRQS; irq++, desc++)
|
|
*desc = bad_irq_desc;
|
|
|
|
arc_init_irq();
|
|
init_dma();
|
|
}
|