*/
void synchronize_irq(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned int status;
- if (irq >= NR_IRQS)
+ if (!desc)
return;
do {
*/
int irq_can_set_affinity(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
if (CHECK_IRQ_PER_CPU(desc->status) || !desc->chip ||
!desc->chip->set_affinity)
*/
int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
+ unsigned long flags;
if (!desc->chip->set_affinity)
return -EINVAL;
- set_balance_irq_affinity(irq, cpumask);
+ spin_lock_irqsave(&desc->lock, flags);
#ifdef CONFIG_GENERIC_PENDING_IRQ
- set_pending_irq(irq, cpumask);
+ if (desc->status & IRQ_MOVE_PCNTXT || desc->status & IRQ_DISABLED) {
+ desc->affinity = cpumask;
+ desc->chip->set_affinity(irq, cpumask);
+ } else {
+ desc->status |= IRQ_MOVE_PENDING;
+ desc->pending_mask = cpumask;
+ }
#else
desc->affinity = cpumask;
desc->chip->set_affinity(irq, cpumask);
#endif
+ desc->status |= IRQ_AFFINITY_SET;
+ spin_unlock_irqrestore(&desc->lock, flags);
return 0;
}
/*
* Generic version of the affinity autoselector.
*/
-int irq_select_affinity(unsigned int irq)
+int do_irq_select_affinity(unsigned int irq, struct irq_desc *desc)
{
cpumask_t mask;
cpus_and(mask, cpu_online_map, irq_default_affinity);
- irq_desc[irq].affinity = mask;
- irq_desc[irq].chip->set_affinity(irq, mask);
+ /*
+ * Preserve an userspace affinity setup, but make sure that
+ * one of the targets is online.
+ */
+ if (desc->status & (IRQ_AFFINITY_SET | IRQ_NO_BALANCING)) {
+ if (cpus_intersects(desc->affinity, cpu_online_map))
+ mask = desc->affinity;
+ else
+ desc->status &= ~IRQ_AFFINITY_SET;
+ }
+
+ desc->affinity = mask;
+ desc->chip->set_affinity(irq, mask);
- set_balance_irq_affinity(irq, mask);
return 0;
}
+#else
+static inline int do_irq_select_affinity(unsigned int irq, struct irq_desc *d)
+{
+ return irq_select_affinity(irq);
+}
#endif
+/*
+ * Called when affinity is set via /proc/irq
+ */
+int irq_select_affinity_usr(unsigned int irq)
+{
+ struct irq_desc *desc = irq_to_desc(irq);
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&desc->lock, flags);
+ ret = do_irq_select_affinity(irq, desc);
+ spin_unlock_irqrestore(&desc->lock, flags);
+
+ return ret;
+}
+
+#else
+static inline int do_irq_select_affinity(int irq, struct irq_desc *desc)
+{
+ return 0;
+}
#endif
/**
*/
void disable_irq_nosync(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
- if (irq >= NR_IRQS)
+ if (!desc)
return;
spin_lock_irqsave(&desc->lock, flags);
*/
void disable_irq(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
- if (irq >= NR_IRQS)
+ if (!desc)
return;
disable_irq_nosync(irq);
{
switch (desc->depth) {
case 0:
- printk(KERN_WARNING "Unbalanced enable for IRQ %d\n", irq);
- WARN_ON(1);
+ WARN(1, KERN_WARNING "Unbalanced enable for IRQ %d\n", irq);
break;
case 1: {
unsigned int status = desc->status & ~IRQ_DISABLED;
*/
void enable_irq(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
- if (irq >= NR_IRQS)
+ if (!desc)
return;
spin_lock_irqsave(&desc->lock, flags);
}
EXPORT_SYMBOL(enable_irq);
+static int set_irq_wake_real(unsigned int irq, unsigned int on)
+{
+ struct irq_desc *desc = irq_to_desc(irq);
+ int ret = -ENXIO;
+
+ if (desc->chip->set_wake)
+ ret = desc->chip->set_wake(irq, on);
+
+ return ret;
+}
+
/**
* set_irq_wake - control irq power management wakeup
* @irq: interrupt to control
*/
int set_irq_wake(unsigned int irq, unsigned int on)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
- int ret = -ENXIO;
- int (*set_wake)(unsigned, unsigned) = desc->chip->set_wake;
+ int ret = 0;
/* wakeup-capable irqs can be shared between drivers that
* don't need to have the same sleep mode behaviors.
*/
spin_lock_irqsave(&desc->lock, flags);
if (on) {
- if (desc->wake_depth++ == 0)
- desc->status |= IRQ_WAKEUP;
- else
- set_wake = NULL;
+ if (desc->wake_depth++ == 0) {
+ ret = set_irq_wake_real(irq, on);
+ if (ret)
+ desc->wake_depth = 0;
+ else
+ desc->status |= IRQ_WAKEUP;
+ }
} else {
if (desc->wake_depth == 0) {
- printk(KERN_WARNING "Unbalanced IRQ %d "
- "wake disable\n", irq);
- WARN_ON(1);
- } else if (--desc->wake_depth == 0)
- desc->status &= ~IRQ_WAKEUP;
- else
- set_wake = NULL;
+ WARN(1, "Unbalanced IRQ %d wake disable\n", irq);
+ } else if (--desc->wake_depth == 0) {
+ ret = set_irq_wake_real(irq, on);
+ if (ret)
+ desc->wake_depth = 1;
+ else
+ desc->status &= ~IRQ_WAKEUP;
+ }
}
- if (set_wake)
- ret = desc->chip->set_wake(irq, on);
+
spin_unlock_irqrestore(&desc->lock, flags);
return ret;
}
*/
int can_request_irq(unsigned int irq, unsigned long irqflags)
{
+ struct irq_desc *desc = irq_to_desc(irq);
struct irqaction *action;
- if (irq >= NR_IRQS || irq_desc[irq].status & IRQ_NOREQUEST)
+ if (!desc)
return 0;
- action = irq_desc[irq].action;
+ if (desc->status & IRQ_NOREQUEST)
+ return 0;
+
+ action = desc->action;
if (action)
if (irqflags & action->flags & IRQF_SHARED)
action = NULL;
desc->handle_irq = NULL;
}
+int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
+ unsigned long flags)
+{
+ int ret;
+ struct irq_chip *chip = desc->chip;
+
+ if (!chip || !chip->set_type) {
+ /*
+ * IRQF_TRIGGER_* but the PIC does not support multiple
+ * flow-types?
+ */
+ pr_debug("No set_type function for IRQ %d (%s)\n", irq,
+ chip ? (chip->name ? : "unknown") : "unknown");
+ return 0;
+ }
+
+ ret = chip->set_type(irq, flags & IRQF_TRIGGER_MASK);
+
+ if (ret)
+ pr_err("setting trigger mode %d for irq %u failed (%pF)\n",
+ (int)(flags & IRQF_TRIGGER_MASK),
+ irq, chip->set_type);
+ else {
+ /* note that IRQF_TRIGGER_MASK == IRQ_TYPE_SENSE_MASK */
+ desc->status &= ~IRQ_TYPE_SENSE_MASK;
+ desc->status |= flags & IRQ_TYPE_SENSE_MASK;
+ }
+
+ return ret;
+}
+
/*
* Internal function to register an irqaction - typically used to
* allocate special interrupts that are part of the architecture.
*/
-int setup_irq(unsigned int irq, struct irqaction *new)
+static int
+__setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
{
- struct irq_desc *desc = irq_desc + irq;
struct irqaction *old, **p;
const char *old_name = NULL;
unsigned long flags;
int shared = 0;
+ int ret;
- if (irq >= NR_IRQS)
+ if (!desc)
return -EINVAL;
if (desc->chip == &no_irq_chip)
shared = 1;
}
- *p = new;
-
- /* Exclude IRQ from balancing */
- if (new->flags & IRQF_NOBALANCING)
- desc->status |= IRQ_NO_BALANCING;
-
if (!shared) {
irq_chip_set_defaults(desc->chip);
-#if defined(CONFIG_IRQ_PER_CPU)
- if (new->flags & IRQF_PERCPU)
- desc->status |= IRQ_PER_CPU;
-#endif
-
/* Setup the type (level, edge polarity) if configured: */
if (new->flags & IRQF_TRIGGER_MASK) {
- if (desc->chip && desc->chip->set_type)
- desc->chip->set_type(irq,
- new->flags & IRQF_TRIGGER_MASK);
- else
- /*
- * IRQF_TRIGGER_* but the PIC does not support
- * multiple flow-types?
- */
- printk(KERN_WARNING "No IRQF_TRIGGER set_type "
- "function for IRQ %d (%s)\n", irq,
- desc->chip ? desc->chip->name :
- "unknown");
+ ret = __irq_set_trigger(desc, irq, new->flags);
+
+ if (ret) {
+ spin_unlock_irqrestore(&desc->lock, flags);
+ return ret;
+ }
} else
compat_irq_chip_set_default_handler(desc);
+#if defined(CONFIG_IRQ_PER_CPU)
+ if (new->flags & IRQF_PERCPU)
+ desc->status |= IRQ_PER_CPU;
+#endif
desc->status &= ~(IRQ_AUTODETECT | IRQ_WAITING |
IRQ_INPROGRESS | IRQ_SPURIOUS_DISABLED);
if (!(desc->status & IRQ_NOAUTOEN)) {
desc->depth = 0;
desc->status &= ~IRQ_DISABLED;
- if (desc->chip->startup)
- desc->chip->startup(irq);
- else
- desc->chip->enable(irq);
+ desc->chip->startup(irq);
} else
/* Undo nested disables: */
desc->depth = 1;
+ /* Exclude IRQ from balancing if requested */
+ if (new->flags & IRQF_NOBALANCING)
+ desc->status |= IRQ_NO_BALANCING;
+
/* Set default affinity mask once everything is setup */
- irq_select_affinity(irq);
+ do_irq_select_affinity(irq, desc);
+
+ } else if ((new->flags & IRQF_TRIGGER_MASK)
+ && (new->flags & IRQF_TRIGGER_MASK)
+ != (desc->status & IRQ_TYPE_SENSE_MASK)) {
+ /* hope the handler works with the actual trigger mode... */
+ pr_warning("IRQ %d uses trigger mode %d; requested %d\n",
+ irq, (int)(desc->status & IRQ_TYPE_SENSE_MASK),
+ (int)(new->flags & IRQF_TRIGGER_MASK));
}
+
+ *p = new;
+
/* Reset broken irq detection when installing new handler */
desc->irq_count = 0;
desc->irqs_unhandled = 0;
spin_unlock_irqrestore(&desc->lock, flags);
new->irq = irq;
- register_irq_proc(irq);
+ register_irq_proc(irq, desc);
new->dir = NULL;
register_handler_proc(irq, new);
}
/**
+ * setup_irq - setup an interrupt
+ * @irq: Interrupt line to setup
+ * @act: irqaction for the interrupt
+ *
+ * Used to statically setup interrupts in the early boot process.
+ */
+int setup_irq(unsigned int irq, struct irqaction *act)
+{
+ struct irq_desc *desc = irq_to_desc(irq);
+
+ return __setup_irq(irq, desc, act);
+}
+
+/**
* free_irq - free an interrupt
* @irq: Interrupt line to free
* @dev_id: Device identity to free
*/
void free_irq(unsigned int irq, void *dev_id)
{
- struct irq_desc *desc;
+ struct irq_desc *desc = irq_to_desc(irq);
struct irqaction **p;
unsigned long flags;
WARN_ON(in_interrupt());
- if (irq >= NR_IRQS)
+
+ if (!desc)
return;
- desc = irq_desc + irq;
spin_lock_irqsave(&desc->lock, flags);
p = &desc->action;
for (;;) {
* IRQF_SHARED Interrupt is shared
* IRQF_DISABLED Disable local interrupts while processing
* IRQF_SAMPLE_RANDOM The interrupt can be used for entropy
+ * IRQF_TRIGGER_* Specify active edge(s) or level
*
*/
int request_irq(unsigned int irq, irq_handler_t handler,
unsigned long irqflags, const char *devname, void *dev_id)
{
struct irqaction *action;
+ struct irq_desc *desc;
int retval;
#ifdef CONFIG_LOCKDEP
*/
if ((irqflags & IRQF_SHARED) && !dev_id)
return -EINVAL;
- if (irq >= NR_IRQS)
+
+ desc = irq_to_desc(irq);
+ if (!desc)
return -EINVAL;
- if (irq_desc[irq].status & IRQ_NOREQUEST)
+
+ if (desc->status & IRQ_NOREQUEST)
return -EINVAL;
if (!handler)
return -EINVAL;
action->next = NULL;
action->dev_id = dev_id;
+ retval = __setup_irq(irq, desc, action);
+ if (retval)
+ kfree(action);
+
#ifdef CONFIG_DEBUG_SHIRQ
if (irqflags & IRQF_SHARED) {
/*
* It's a shared IRQ -- the driver ought to be prepared for it
* to happen immediately, so let's make sure....
- * We do this before actually registering it, to make sure that
- * a 'real' IRQ doesn't run in parallel with our fake
+ * We disable the irq to make sure that a 'real' IRQ doesn't
+ * run in parallel with our fake.
*/
unsigned long flags;
+ disable_irq(irq);
local_irq_save(flags);
+
handler(irq, dev_id);
+
local_irq_restore(flags);
+ enable_irq(irq);
}
#endif
-
- retval = setup_irq(irq, action);
- if (retval)
- kfree(action);
-
return retval;
}
EXPORT_SYMBOL(request_irq);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff