};
int __irq_offset_value;
-int ppc_spurious_interrupts = 0;
-unsigned long lpEvent_count = 0;
+int ppc_spurious_interrupts;
+unsigned long lpevent_count;
int
setup_irq(unsigned int irq, struct irqaction * new)
#endif /* CONFIG_SMP */
-/* XXX Make this into free_irq() - Anton */
-
-/* This could be promoted to a real free_irq() ... */
-static int
-do_free_irq(int irq, void* dev_id)
-{
- irq_desc_t *desc = get_irq_desc(irq);
- struct irqaction **p;
- unsigned long flags;
-
- spin_lock_irqsave(&desc->lock,flags);
- p = &desc->action;
- for (;;) {
- struct irqaction * action = *p;
- if (action) {
- struct irqaction **pp = p;
- p = &action->next;
- if (action->dev_id != dev_id)
- continue;
-
- /* Found it - now remove it from the list of entries */
- *pp = action->next;
- if (!desc->action) {
- desc->status |= IRQ_DISABLED;
- mask_irq(irq);
- }
- spin_unlock_irqrestore(&desc->lock,flags);
-
- /* Wait to make sure it's not being used on another CPU */
- synchronize_irq(irq);
- kfree(action);
- return 0;
- }
- printk("Trying to free free IRQ%d\n",irq);
- spin_unlock_irqrestore(&desc->lock,flags);
- break;
- }
- return -ENOENT;
-}
-
-
int request_irq(unsigned int irq,
irqreturn_t (*handler)(int, void *, struct pt_regs *),
unsigned long irqflags, const char * devname, void *dev_id)
if (irq >= NR_IRQS)
return -EINVAL;
if (!handler)
- /* We could implement really free_irq() instead of that... */
- return do_free_irq(irq, dev_id);
+ return -EINVAL;
action = (struct irqaction *)
kmalloc(sizeof(struct irqaction), GFP_KERNEL);
action->handler = handler;
action->flags = irqflags;
- action->mask = 0;
+ cpus_clear(action->mask);
action->name = devname;
action->dev_id = dev_id;
action->next = NULL;
void free_irq(unsigned int irq, void *dev_id)
{
- request_irq(irq, NULL, 0, NULL, dev_id);
+ irq_desc_t *desc = get_irq_desc(irq);
+ struct irqaction **p;
+ unsigned long flags;
+
+ spin_lock_irqsave(&desc->lock,flags);
+ p = &desc->action;
+ for (;;) {
+ struct irqaction * action = *p;
+ if (action) {
+ struct irqaction **pp = p;
+ p = &action->next;
+ if (action->dev_id != dev_id)
+ continue;
+
+ /* Found it - now remove it from the list of entries */
+ *pp = action->next;
+ if (!desc->action) {
+ desc->status |= IRQ_DISABLED;
+ mask_irq(irq);
+ }
+ spin_unlock_irqrestore(&desc->lock,flags);
+
+ /* Wait to make sure it's not being used on another CPU */
+ synchronize_irq(irq);
+ kfree(action);
+ return;
+ }
+ printk("Trying to free free IRQ%d\n",irq);
+ spin_unlock_irqrestore(&desc->lock,flags);
+ break;
+ }
+ return;
}
EXPORT_SYMBOL(free_irq);
return 0;
}
-static inline int handle_irq_event(int irq, struct pt_regs *regs,
- struct irqaction *action)
+int handle_irq_event(int irq, struct pt_regs *regs, struct irqaction *action)
{
int status = 0;
int retval = 0;
-#ifndef CONFIG_PPC_ISERIES
if (!(action->flags & SA_INTERRUPT))
local_irq_enable();
-#endif
do {
status |= action->flags;
} while (action);
if (status & SA_SAMPLE_RANDOM)
add_interrupt_randomness(irq);
-#ifndef CONFIG_PPC_ISERIES
local_irq_disable();
-#endif
return retval;
}
int cpu = smp_processor_id();
irq_desc_t *desc = get_irq_desc(irq);
irqreturn_t action_ret;
+#ifdef CONFIG_IRQSTACKS
+ struct thread_info *curtp, *irqtp;
+#endif
kstat_cpu(cpu).irqs[irq]++;
*/
for (;;) {
spin_unlock(&desc->lock);
- action_ret = handle_irq_event(irq, regs, action);
+
+#ifdef CONFIG_IRQSTACKS
+ /* Switch to the irq stack to handle this */
+ curtp = current_thread_info();
+ irqtp = hardirq_ctx[smp_processor_id()];
+ if (curtp != irqtp) {
+ irqtp->task = curtp->task;
+ irqtp->flags = 0;
+ action_ret = call_handle_irq_event(irq, regs, action, irqtp);
+ irqtp->task = NULL;
+ if (irqtp->flags)
+ set_bits(irqtp->flags, &curtp->flags);
+ } else
+#endif
+ action_ret = handle_irq_event(irq, regs, action);
+
spin_lock(&desc->lock);
if (!noirqdebug)
note_interrupt(irq, desc, action_ret);
}
#ifdef CONFIG_PPC_ISERIES
-int do_IRQ(struct pt_regs *regs)
+void do_IRQ(struct pt_regs *regs)
{
struct paca_struct *lpaca;
struct ItLpQueue *lpq;
lpaca = get_paca();
#ifdef CONFIG_SMP
- if (lpaca->xLpPaca.xIntDword.xFields.xIpiCnt) {
- lpaca->xLpPaca.xIntDword.xFields.xIpiCnt = 0;
+ if (lpaca->lppaca.xIntDword.xFields.xIpiCnt) {
+ lpaca->lppaca.xIntDword.xFields.xIpiCnt = 0;
iSeries_smp_message_recv(regs);
}
#endif /* CONFIG_SMP */
- lpq = lpaca->lpQueuePtr;
+ lpq = lpaca->lpqueue_ptr;
if (lpq && ItLpQueue_isLpIntPending(lpq))
- lpEvent_count += ItLpQueue_process(lpq, regs);
+ lpevent_count += ItLpQueue_process(lpq, regs);
irq_exit();
- if (lpaca->xLpPaca.xIntDword.xFields.xDecrInt) {
- lpaca->xLpPaca.xIntDword.xFields.xDecrInt = 0;
+ if (lpaca->lppaca.xIntDword.xFields.xDecrInt) {
+ lpaca->lppaca.xIntDword.xFields.xDecrInt = 0;
/* Signal a fake decrementer interrupt */
timer_interrupt(regs);
}
-
- return 1; /* lets ret_from_int know we can do checks */
}
#else /* CONFIG_PPC_ISERIES */
-int do_IRQ(struct pt_regs *regs)
+void do_IRQ(struct pt_regs *regs)
{
- int irq, first = 1;
+ int irq;
irq_enter();
- /*
- * Every arch is required to implement ppc_md.get_irq.
- * This function will either return an irq number or -1 to
- * indicate there are no more pending. But the first time
- * through the loop this means there wasn't an IRQ pending.
- * The value -2 is for buggy hardware and means that this IRQ
- * has already been handled. -- Tom
- */
- while ((irq = ppc_md.get_irq(regs)) >= 0) {
- ppc_irq_dispatch_handler(regs, irq);
- first = 0;
+#ifdef CONFIG_DEBUG_STACKOVERFLOW
+ /* Debugging check for stack overflow: is there less than 4KB free? */
+ {
+ long sp;
+
+ sp = __get_SP() & (THREAD_SIZE-1);
+
+ if (unlikely(sp < (sizeof(struct thread_info) + 4096))) {
+ printk("do_IRQ: stack overflow: %ld\n",
+ sp - sizeof(struct thread_info));
+ dump_stack();
+ }
}
- if (irq != -2 && first)
+#endif
+
+ irq = ppc_md.get_irq(regs);
+
+ if (irq >= 0)
+ ppc_irq_dispatch_handler(regs, irq);
+ else
/* That's not SMP safe ... but who cares ? */
ppc_spurious_interrupts++;
irq_exit();
-
- return 1; /* lets ret_from_int know we can do checks */
}
#endif /* CONFIG_PPC_ISERIES */
once++;
ppc_md.init_IRQ();
+ irq_ctx_init();
}
static struct proc_dir_entry * root_irq_dir;
return len;
}
-static int irq_affinity_write_proc (struct file *file, const char *buffer,
+static int irq_affinity_write_proc (struct file *file, const char __user *buffer,
unsigned long count, void *data)
{
unsigned int irq = (long)data;
irq_desc_t *desc = get_irq_desc(irq);
int ret;
cpumask_t new_value, tmp;
- cpumask_t allcpus = CPU_MASK_ALL;
if (!desc->handler->set_affinity)
return -EIO;
* NR_CPUS == 32 and cpumask is a long), so we mask it here to
* be consistent.
*/
- cpus_and(new_value, new_value, allcpus);
+ cpus_and(new_value, new_value, CPU_MASK_ALL);
/*
* Grab lock here so cpu_online_map can't change, and also
{
unsigned i;
for (i=0; i<NR_CPUS; ++i) {
- if ( paca[i].prof_buffer && (new_value & 1) )
+ if ( paca[i].prof_buffer && cpu_isset(i, new_value) )
paca[i].prof_enabled = 1;
else
paca[i].prof_enabled = 0;
- new_value >>= 1;
}
}
#endif
int i;
/* create /proc/irq */
- root_irq_dir = proc_mkdir("irq", 0);
+ root_irq_dir = proc_mkdir("irq", NULL);
/* create /proc/irq/prof_cpu_mask */
entry = create_proc_entry("prof_cpu_mask", 0600, root_irq_dir);
}
-#endif
+#endif /* CONFIG_PPC_ISERIES */
+
+#ifdef CONFIG_IRQSTACKS
+struct thread_info *softirq_ctx[NR_CPUS];
+struct thread_info *hardirq_ctx[NR_CPUS];
+
+void irq_ctx_init(void)
+{
+ struct thread_info *tp;
+ int i;
+
+ for (i = 0; i < NR_CPUS; i++) {
+ memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
+ tp = softirq_ctx[i];
+ tp->cpu = i;
+ tp->preempt_count = SOFTIRQ_OFFSET;
+
+ memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
+ tp = hardirq_ctx[i];
+ tp->cpu = i;
+ tp->preempt_count = HARDIRQ_OFFSET;
+ }
+}
+
+void do_softirq(void)
+{
+ unsigned long flags;
+ struct thread_info *curtp, *irqtp;
+
+ if (in_interrupt())
+ return;
+
+ local_irq_save(flags);
+
+ if (local_softirq_pending()) {
+ curtp = current_thread_info();
+ irqtp = softirq_ctx[smp_processor_id()];
+ irqtp->task = curtp->task;
+ call_do_softirq(irqtp);
+ irqtp->task = NULL;
+ }
+
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL(do_softirq);
+
+#endif /* CONFIG_IRQSTACKS */
+
git://git.onelab.eu / linux-2.6.git / blobdiff