mirror of
https://github.com/torvalds/linux.git
synced 2024-11-19 18:41:48 +00:00
f6649a7e5a
Read external interrupts parameters from the lowcore in the first level interrupt handler in entry[64].S. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
146 lines
3.7 KiB
C
146 lines
3.7 KiB
C
/*
|
|
* arch/s390/kernel/s390_ext.c
|
|
*
|
|
* S390 version
|
|
* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
|
|
* Author(s): Holger Smolinski (Holger.Smolinski@de.ibm.com),
|
|
* Martin Schwidefsky (schwidefsky@de.ibm.com)
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/ftrace.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/interrupt.h>
|
|
#include <asm/cputime.h>
|
|
#include <asm/lowcore.h>
|
|
#include <asm/s390_ext.h>
|
|
#include <asm/irq_regs.h>
|
|
#include <asm/irq.h>
|
|
#include "entry.h"
|
|
|
|
/*
|
|
* ext_int_hash[index] is the start of the list for all external interrupts
|
|
* that hash to this index. With the current set of external interrupts
|
|
* (0x1202 external call, 0x1004 cpu timer, 0x2401 hwc console, 0x4000
|
|
* iucv and 0x2603 pfault) this is always the first element.
|
|
*/
|
|
ext_int_info_t *ext_int_hash[256] = { NULL, };
|
|
|
|
static inline int ext_hash(__u16 code)
|
|
{
|
|
return (code + (code >> 9)) & 0xff;
|
|
}
|
|
|
|
int register_external_interrupt(__u16 code, ext_int_handler_t handler)
|
|
{
|
|
ext_int_info_t *p;
|
|
int index;
|
|
|
|
p = kmalloc(sizeof(ext_int_info_t), GFP_ATOMIC);
|
|
if (p == NULL)
|
|
return -ENOMEM;
|
|
p->code = code;
|
|
p->handler = handler;
|
|
index = ext_hash(code);
|
|
p->next = ext_int_hash[index];
|
|
ext_int_hash[index] = p;
|
|
return 0;
|
|
}
|
|
|
|
int register_early_external_interrupt(__u16 code, ext_int_handler_t handler,
|
|
ext_int_info_t *p)
|
|
{
|
|
int index;
|
|
|
|
if (p == NULL)
|
|
return -EINVAL;
|
|
p->code = code;
|
|
p->handler = handler;
|
|
index = ext_hash(code);
|
|
p->next = ext_int_hash[index];
|
|
ext_int_hash[index] = p;
|
|
return 0;
|
|
}
|
|
|
|
int unregister_external_interrupt(__u16 code, ext_int_handler_t handler)
|
|
{
|
|
ext_int_info_t *p, *q;
|
|
int index;
|
|
|
|
index = ext_hash(code);
|
|
q = NULL;
|
|
p = ext_int_hash[index];
|
|
while (p != NULL) {
|
|
if (p->code == code && p->handler == handler)
|
|
break;
|
|
q = p;
|
|
p = p->next;
|
|
}
|
|
if (p == NULL)
|
|
return -ENOENT;
|
|
if (q != NULL)
|
|
q->next = p->next;
|
|
else
|
|
ext_int_hash[index] = p->next;
|
|
kfree(p);
|
|
return 0;
|
|
}
|
|
|
|
int unregister_early_external_interrupt(__u16 code, ext_int_handler_t handler,
|
|
ext_int_info_t *p)
|
|
{
|
|
ext_int_info_t *q;
|
|
int index;
|
|
|
|
if (p == NULL || p->code != code || p->handler != handler)
|
|
return -EINVAL;
|
|
index = ext_hash(code);
|
|
q = ext_int_hash[index];
|
|
if (p != q) {
|
|
while (q != NULL) {
|
|
if (q->next == p)
|
|
break;
|
|
q = q->next;
|
|
}
|
|
if (q == NULL)
|
|
return -ENOENT;
|
|
q->next = p->next;
|
|
} else
|
|
ext_int_hash[index] = p->next;
|
|
return 0;
|
|
}
|
|
|
|
void __irq_entry do_extint(struct pt_regs *regs, unsigned int ext_int_code,
|
|
unsigned int param32, unsigned long param64)
|
|
{
|
|
struct pt_regs *old_regs;
|
|
unsigned short code;
|
|
ext_int_info_t *p;
|
|
int index;
|
|
|
|
code = (unsigned short) ext_int_code;
|
|
old_regs = set_irq_regs(regs);
|
|
s390_idle_check(regs, S390_lowcore.int_clock,
|
|
S390_lowcore.async_enter_timer);
|
|
irq_enter();
|
|
if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
|
|
/* Serve timer interrupts first. */
|
|
clock_comparator_work();
|
|
kstat_cpu(smp_processor_id()).irqs[EXTERNAL_INTERRUPT]++;
|
|
if (code != 0x1004)
|
|
__get_cpu_var(s390_idle).nohz_delay = 1;
|
|
index = ext_hash(code);
|
|
for (p = ext_int_hash[index]; p; p = p->next) {
|
|
if (likely(p->code == code))
|
|
p->handler(ext_int_code, param32, param64);
|
|
}
|
|
irq_exit();
|
|
set_irq_regs(old_regs);
|
|
}
|
|
|
|
EXPORT_SYMBOL(register_external_interrupt);
|
|
EXPORT_SYMBOL(unregister_external_interrupt);
|