b1b7509185
Get rid of register/unregister_early_external_interrupt() and clean up the code while at it. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/*
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* Copyright IBM Corp. 1999,2010
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* Author(s): Holger Smolinski <Holger.Smolinski@de.ibm.com>,
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* Martin Schwidefsky <schwidefsky@de.ibm.com>,
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*/
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#include <linux/kernel_stat.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/ftrace.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <asm/s390_ext.h>
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#include <asm/irq_regs.h>
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#include <asm/cputime.h>
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#include <asm/lowcore.h>
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#include <asm/irq.h>
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#include "entry.h"
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struct ext_int_info {
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struct ext_int_info *next;
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ext_int_handler_t handler;
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__u16 code;
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};
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/*
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* ext_int_hash[index] is the start of the list for all external interrupts
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* that hash to this index. With the current set of external interrupts
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* (0x1202 external call, 0x1004 cpu timer, 0x2401 hwc console, 0x4000
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* iucv and 0x2603 pfault) this is always the first element.
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*/
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static struct ext_int_info *ext_int_hash[256];
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static inline int ext_hash(__u16 code)
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{
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return (code + (code >> 9)) & 0xff;
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}
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int register_external_interrupt(__u16 code, ext_int_handler_t handler)
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{
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struct ext_int_info *p;
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int index;
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p = kmalloc(sizeof(*p), GFP_ATOMIC);
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if (!p)
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return -ENOMEM;
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p->code = code;
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p->handler = handler;
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index = ext_hash(code);
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p->next = ext_int_hash[index];
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ext_int_hash[index] = p;
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return 0;
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}
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EXPORT_SYMBOL(register_external_interrupt);
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int unregister_external_interrupt(__u16 code, ext_int_handler_t handler)
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{
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struct ext_int_info *p, *q;
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int index;
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index = ext_hash(code);
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q = NULL;
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p = ext_int_hash[index];
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while (p) {
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if (p->code == code && p->handler == handler)
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break;
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q = p;
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p = p->next;
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}
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if (!p)
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return -ENOENT;
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if (q)
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q->next = p->next;
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else
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ext_int_hash[index] = p->next;
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kfree(p);
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return 0;
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}
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EXPORT_SYMBOL(unregister_external_interrupt);
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void __irq_entry do_extint(struct pt_regs *regs, unsigned int ext_int_code,
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unsigned int param32, unsigned long param64)
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{
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struct pt_regs *old_regs;
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unsigned short code;
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struct ext_int_info *p;
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int index;
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code = (unsigned short) ext_int_code;
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old_regs = set_irq_regs(regs);
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s390_idle_check(regs, S390_lowcore.int_clock,
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S390_lowcore.async_enter_timer);
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irq_enter();
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if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
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/* Serve timer interrupts first. */
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clock_comparator_work();
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kstat_cpu(smp_processor_id()).irqs[EXTERNAL_INTERRUPT]++;
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if (code != 0x1004)
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__get_cpu_var(s390_idle).nohz_delay = 1;
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index = ext_hash(code);
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for (p = ext_int_hash[index]; p; p = p->next) {
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if (likely(p->code == code))
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p->handler(ext_int_code, param32, param64);
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}
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irq_exit();
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set_irq_regs(old_regs);
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}
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