* shouldn't result in any weird surprises, and installing new handlers
* should be easier.
*
- * Notice Linux/CRIS: these routines do not care about SMP
- *
*/
/*
#include <linux/config.h>
#include <linux/module.h>
#include <linux/ptrace.h>
+#include <linux/irq.h>
#include <linux/kernel_stat.h>
#include <linux/signal.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/errno.h>
-#include <linux/bitops.h>
+#include <linux/spinlock.h>
#include <asm/io.h>
-/* Defined in arch specific irq.c */
-extern void arch_setup_irq(int irq);
-extern void arch_free_irq(int irq);
-
-void
-disable_irq(unsigned int irq_nr)
-{
- unsigned long flags;
-
- local_save_flags(flags);
- local_irq_disable();
- mask_irq(irq_nr);
- local_irq_restore(flags);
-}
-
-void
-enable_irq(unsigned int irq_nr)
+void ack_bad_irq(unsigned int irq)
{
- unsigned long flags;
- local_save_flags(flags);
- local_irq_disable();
- unmask_irq(irq_nr);
- local_irq_restore(flags);
+ printk("unexpected IRQ trap at vector %02x\n", irq);
}
-unsigned long
-probe_irq_on()
-{
- return 0;
-}
-
-EXPORT_SYMBOL(probe_irq_on);
-
-int
-probe_irq_off(unsigned long x)
-{
- return 0;
-}
-
-EXPORT_SYMBOL(probe_irq_off);
-
-/*
- * Initial irq handlers.
- */
-
-static struct irqaction *irq_action[NR_IRQS];
-
int show_interrupts(struct seq_file *p, void *v)
{
- int i = *(loff_t *) v;
+ int i = *(loff_t *) v, j;
struct irqaction * action;
unsigned long flags;
+ if (i == 0) {
+ seq_printf(p, " ");
+ for_each_online_cpu(j)
+ seq_printf(p, "CPU%d ",j);
+ seq_putc(p, '\n');
+ }
+
if (i < NR_IRQS) {
- local_irq_save(flags);
- action = irq_action[i];
- if (!action)
+ spin_lock_irqsave(&irq_desc[i].lock, flags);
+ action = irq_desc[i].action;
+ if (!action)
goto skip;
- seq_printf(p, "%2d: %10u %c %s",
- i, kstat_this_cpu.irqs[i],
- (action->flags & SA_INTERRUPT) ? '+' : ' ',
- action->name);
- for (action = action->next; action; action = action->next) {
- seq_printf(p, ",%s %s",
- (action->flags & SA_INTERRUPT) ? " +" : "",
- action->name);
- }
+ seq_printf(p, "%3d: ",i);
+#ifndef CONFIG_SMP
+ seq_printf(p, "%10u ", kstat_irqs(i));
+#else
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
+#endif
+ seq_printf(p, " %14s", irq_desc[i].handler->typename);
+ seq_printf(p, " %s", action->name);
+
+ for (action=action->next; action; action = action->next)
+ seq_printf(p, ", %s", action->name);
+
seq_putc(p, '\n');
skip:
- local_irq_restore(flags);
+ spin_unlock_irqrestore(&irq_desc[i].lock, flags);
}
return 0;
}
+
/* called by the assembler IRQ entry functions defined in irq.h
* to dispatch the interrupts to registred handlers
* interrupts are disabled upon entry - depending on if the
asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
{
- struct irqaction *action;
- int do_random, cpu;
- int ret, retval = 0;
-
- cpu = smp_processor_id();
- irq_enter();
- kstat_cpu(cpu).irqs[irq - FIRST_IRQ]++;
- action = irq_action[irq - FIRST_IRQ];
-
- if (action) {
- if (!(action->flags & SA_INTERRUPT))
- local_irq_enable();
- do_random = 0;
- do {
- ret = action->handler(irq, action->dev_id, regs);
- if (ret == IRQ_HANDLED)
- do_random |= action->flags;
- retval |= ret;
- action = action->next;
- } while (action);
-
- if (retval != 1) {
- if (retval) {
- printk("irq event %d: bogus retval mask %x\n",
- irq, retval);
- } else {
- printk("irq %d: nobody cared\n", irq);
- }
- }
-
- if (do_random & SA_SAMPLE_RANDOM)
- add_interrupt_randomness(irq);
- local_irq_disable();
- }
- irq_exit();
-}
-
-/* this function links in a handler into the chain of handlers for the
- given irq, and if the irq has never been registred, the appropriate
- handler is entered into the interrupt vector
-*/
-
-int setup_irq(int irq, struct irqaction * new)
-{
- int shared = 0;
- struct irqaction *old, **p;
- unsigned long flags;
-
- p = irq_action + irq - FIRST_IRQ;
- if ((old = *p) != NULL) {
- /* Can't share interrupts unless both agree to */
- if (!(old->flags & new->flags & SA_SHIRQ))
- return -EBUSY;
-
- /* Can't share interrupts unless both are same type */
- if ((old->flags ^ new->flags) & SA_INTERRUPT)
- return -EBUSY;
-
- /* add new interrupt at end of irq queue */
- do {
- p = &old->next;
- old = *p;
- } while (old);
- shared = 1;
- }
-
- if (new->flags & SA_SAMPLE_RANDOM)
- rand_initialize_irq(irq);
-
- local_save_flags(flags);
- local_irq_disable();
- *p = new;
-
- if (!shared) {
- /* if the irq wasn't registred before, enter it into the vector table
- and unmask it physically
- */
- arch_setup_irq(irq);
- unmask_irq(irq);
- }
-
- local_irq_restore(flags);
- return 0;
-}
-
-/* this function is called by a driver to register an irq handler
- Valid flags:
- SA_INTERRUPT -> it's a fast interrupt, handler called with irq disabled and
- no signal checking etc is performed upon exit
- SA_SHIRQ -> the interrupt can be shared between different handlers, the handler
- is required to check if the irq was "aimed" at it explicitely
- SA_RANDOM -> the interrupt will add to the random generators entropy
-*/
-
-int request_irq(unsigned int irq,
- irqreturn_t (*handler)(int, void *, struct pt_regs *),
- unsigned long irqflags,
- const char * devname,
- void *dev_id)
-{
- int retval;
- struct irqaction * action;
-
- if(!handler)
- return -EINVAL;
-
- /* allocate and fill in a handler structure and setup the irq */
-
- action = (struct irqaction *)kmalloc(sizeof(struct irqaction), GFP_KERNEL);
- if (!action)
- return -ENOMEM;
-
- action->handler = handler;
- action->flags = irqflags;
- 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);
-
-void free_irq(unsigned int irq, void *dev_id)
-{
- struct irqaction * action, **p;
- unsigned long flags;
-
- if (irq >= NR_IRQS) {
- printk("Trying to free IRQ%d\n",irq);
- return;
+ unsigned long sp;
+ irq_enter();
+ sp = rdsp();
+ if (unlikely((sp & (PAGE_SIZE - 1)) < (PAGE_SIZE/8))) {
+ printk("do_IRQ: stack overflow: %lX\n", sp);
+ show_stack(NULL, (unsigned long *)sp);
}
- for (p = irq - FIRST_IRQ + irq_action; (action = *p) != NULL; p = &action->next) {
- if (action->dev_id != dev_id)
- continue;
-
- /* Found it - now free it */
- local_save_flags(flags);
- local_irq_disable();
- *p = action->next;
- if (!irq_action[irq - FIRST_IRQ]) {
- mask_irq(irq);
- arch_free_irq(irq);
- }
- local_irq_restore(flags);
- kfree(action);
- return;
- }
- printk("Trying to free free IRQ%d\n",irq);
+ __do_IRQ(irq, regs);
+ irq_exit();
}
-EXPORT_SYMBOL(free_irq);
-
void weird_irq(void)
{
local_irq_disable();
while(1);
}
-#if defined(CONFIG_PROC_FS) && defined(CONFIG_SYSCTL)
-/* Used by other archs to show/control IRQ steering during SMP */
-void __init
-init_irq_proc(void)
-{
-}
-#endif
git://git.onelab.eu / linux-2.6.git / blobdiff