forked from luck/tmp_suning_uos_patched
50f7c03275
Now that everything uses the wrappers, we can remove the default functions. None of those functions is performance critical. That makes the IRQ_MASKED flag tracking fully consistent. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
763 lines
18 KiB
C
763 lines
18 KiB
C
/*
|
|
* linux/kernel/irq/chip.c
|
|
*
|
|
* Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
|
|
* Copyright (C) 2005-2006, Thomas Gleixner, Russell King
|
|
*
|
|
* This file contains the core interrupt handling code, for irq-chip
|
|
* based architectures.
|
|
*
|
|
* Detailed information is available in Documentation/DocBook/genericirq
|
|
*/
|
|
|
|
#include <linux/irq.h>
|
|
#include <linux/msi.h>
|
|
#include <linux/module.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel_stat.h>
|
|
|
|
#include "internals.h"
|
|
|
|
/**
|
|
* irq_set_chip - set the irq chip for an irq
|
|
* @irq: irq number
|
|
* @chip: pointer to irq chip description structure
|
|
*/
|
|
int irq_set_chip(unsigned int irq, struct irq_chip *chip)
|
|
{
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
unsigned long flags;
|
|
|
|
if (!desc) {
|
|
WARN(1, KERN_ERR "Trying to install chip for IRQ%d\n", irq);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!chip)
|
|
chip = &no_irq_chip;
|
|
|
|
raw_spin_lock_irqsave(&desc->lock, flags);
|
|
irq_chip_set_defaults(chip);
|
|
desc->irq_data.chip = chip;
|
|
raw_spin_unlock_irqrestore(&desc->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(irq_set_chip);
|
|
|
|
/**
|
|
* irq_set_type - set the irq trigger type for an irq
|
|
* @irq: irq number
|
|
* @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
|
|
*/
|
|
int irq_set_irq_type(unsigned int irq, unsigned int type)
|
|
{
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
unsigned long flags;
|
|
int ret = -ENXIO;
|
|
|
|
if (!desc) {
|
|
printk(KERN_ERR "Trying to set irq type for IRQ%d\n", irq);
|
|
return -ENODEV;
|
|
}
|
|
|
|
type &= IRQ_TYPE_SENSE_MASK;
|
|
if (type == IRQ_TYPE_NONE)
|
|
return 0;
|
|
|
|
chip_bus_lock(desc);
|
|
raw_spin_lock_irqsave(&desc->lock, flags);
|
|
ret = __irq_set_trigger(desc, irq, type);
|
|
raw_spin_unlock_irqrestore(&desc->lock, flags);
|
|
chip_bus_sync_unlock(desc);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(irq_set_irq_type);
|
|
|
|
/**
|
|
* irq_set_handler_data - set irq handler data for an irq
|
|
* @irq: Interrupt number
|
|
* @data: Pointer to interrupt specific data
|
|
*
|
|
* Set the hardware irq controller data for an irq
|
|
*/
|
|
int irq_set_handler_data(unsigned int irq, void *data)
|
|
{
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
unsigned long flags;
|
|
|
|
if (!desc) {
|
|
printk(KERN_ERR
|
|
"Trying to install controller data for IRQ%d\n", irq);
|
|
return -EINVAL;
|
|
}
|
|
|
|
raw_spin_lock_irqsave(&desc->lock, flags);
|
|
desc->irq_data.handler_data = data;
|
|
raw_spin_unlock_irqrestore(&desc->lock, flags);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(irq_set_handler_data);
|
|
|
|
/**
|
|
* irq_set_msi_desc - set MSI descriptor data for an irq
|
|
* @irq: Interrupt number
|
|
* @entry: Pointer to MSI descriptor data
|
|
*
|
|
* Set the MSI descriptor entry for an irq
|
|
*/
|
|
int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
|
|
{
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
unsigned long flags;
|
|
|
|
if (!desc) {
|
|
printk(KERN_ERR
|
|
"Trying to install msi data for IRQ%d\n", irq);
|
|
return -EINVAL;
|
|
}
|
|
|
|
raw_spin_lock_irqsave(&desc->lock, flags);
|
|
desc->irq_data.msi_desc = entry;
|
|
if (entry)
|
|
entry->irq = irq;
|
|
raw_spin_unlock_irqrestore(&desc->lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* irq_set_chip_data - set irq chip data for an irq
|
|
* @irq: Interrupt number
|
|
* @data: Pointer to chip specific data
|
|
*
|
|
* Set the hardware irq chip data for an irq
|
|
*/
|
|
int irq_set_chip_data(unsigned int irq, void *data)
|
|
{
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
unsigned long flags;
|
|
|
|
if (!desc) {
|
|
printk(KERN_ERR
|
|
"Trying to install chip data for IRQ%d\n", irq);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!desc->irq_data.chip) {
|
|
printk(KERN_ERR "BUG: bad set_irq_chip_data(IRQ#%d)\n", irq);
|
|
return -EINVAL;
|
|
}
|
|
|
|
raw_spin_lock_irqsave(&desc->lock, flags);
|
|
desc->irq_data.chip_data = data;
|
|
raw_spin_unlock_irqrestore(&desc->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(irq_set_chip_data);
|
|
|
|
struct irq_data *irq_get_irq_data(unsigned int irq)
|
|
{
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
|
|
return desc ? &desc->irq_data : NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_get_irq_data);
|
|
|
|
/**
|
|
* set_irq_nested_thread - Set/Reset the IRQ_NESTED_THREAD flag of an irq
|
|
*
|
|
* @irq: Interrupt number
|
|
* @nest: 0 to clear / 1 to set the IRQ_NESTED_THREAD flag
|
|
*
|
|
* The IRQ_NESTED_THREAD flag indicates that on
|
|
* request_threaded_irq() no separate interrupt thread should be
|
|
* created for the irq as the handler are called nested in the
|
|
* context of a demultiplexing interrupt handler thread.
|
|
*/
|
|
void set_irq_nested_thread(unsigned int irq, int nest)
|
|
{
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
unsigned long flags;
|
|
|
|
if (!desc)
|
|
return;
|
|
|
|
raw_spin_lock_irqsave(&desc->lock, flags);
|
|
if (nest)
|
|
desc->status |= IRQ_NESTED_THREAD;
|
|
else
|
|
desc->status &= ~IRQ_NESTED_THREAD;
|
|
raw_spin_unlock_irqrestore(&desc->lock, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(set_irq_nested_thread);
|
|
|
|
int irq_startup(struct irq_desc *desc)
|
|
{
|
|
desc->status &= ~(IRQ_MASKED | IRQ_DISABLED);
|
|
desc->depth = 0;
|
|
|
|
if (desc->irq_data.chip->irq_startup)
|
|
return desc->irq_data.chip->irq_startup(&desc->irq_data);
|
|
|
|
irq_enable(desc);
|
|
return 0;
|
|
}
|
|
|
|
void irq_shutdown(struct irq_desc *desc)
|
|
{
|
|
desc->status |= IRQ_MASKED | IRQ_DISABLED;
|
|
desc->depth = 1;
|
|
if (desc->irq_data.chip->irq_shutdown)
|
|
desc->irq_data.chip->irq_shutdown(&desc->irq_data);
|
|
if (desc->irq_data.chip->irq_disable)
|
|
desc->irq_data.chip->irq_disable(&desc->irq_data);
|
|
else
|
|
desc->irq_data.chip->irq_mask(&desc->irq_data);
|
|
}
|
|
|
|
void irq_enable(struct irq_desc *desc)
|
|
{
|
|
if (desc->irq_data.chip->irq_enable)
|
|
desc->irq_data.chip->irq_enable(&desc->irq_data);
|
|
else
|
|
desc->irq_data.chip->irq_unmask(&desc->irq_data);
|
|
desc->status &= ~IRQ_MASKED;
|
|
}
|
|
|
|
void irq_disable(struct irq_desc *desc)
|
|
{
|
|
if (desc->irq_data.chip->irq_disable) {
|
|
desc->irq_data.chip->irq_disable(&desc->irq_data);
|
|
desc->status |= IRQ_MASKED;
|
|
}
|
|
}
|
|
|
|
#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
|
|
/* Temporary migration helpers */
|
|
static void compat_irq_mask(struct irq_data *data)
|
|
{
|
|
data->chip->mask(data->irq);
|
|
}
|
|
|
|
static void compat_irq_unmask(struct irq_data *data)
|
|
{
|
|
data->chip->unmask(data->irq);
|
|
}
|
|
|
|
static void compat_irq_ack(struct irq_data *data)
|
|
{
|
|
data->chip->ack(data->irq);
|
|
}
|
|
|
|
static void compat_irq_mask_ack(struct irq_data *data)
|
|
{
|
|
data->chip->mask_ack(data->irq);
|
|
}
|
|
|
|
static void compat_irq_eoi(struct irq_data *data)
|
|
{
|
|
data->chip->eoi(data->irq);
|
|
}
|
|
|
|
static void compat_irq_enable(struct irq_data *data)
|
|
{
|
|
data->chip->enable(data->irq);
|
|
}
|
|
|
|
static void compat_irq_disable(struct irq_data *data)
|
|
{
|
|
data->chip->disable(data->irq);
|
|
}
|
|
|
|
static void compat_irq_shutdown(struct irq_data *data)
|
|
{
|
|
data->chip->shutdown(data->irq);
|
|
}
|
|
|
|
static unsigned int compat_irq_startup(struct irq_data *data)
|
|
{
|
|
return data->chip->startup(data->irq);
|
|
}
|
|
|
|
static int compat_irq_set_affinity(struct irq_data *data,
|
|
const struct cpumask *dest, bool force)
|
|
{
|
|
return data->chip->set_affinity(data->irq, dest);
|
|
}
|
|
|
|
static int compat_irq_set_type(struct irq_data *data, unsigned int type)
|
|
{
|
|
return data->chip->set_type(data->irq, type);
|
|
}
|
|
|
|
static int compat_irq_set_wake(struct irq_data *data, unsigned int on)
|
|
{
|
|
return data->chip->set_wake(data->irq, on);
|
|
}
|
|
|
|
static int compat_irq_retrigger(struct irq_data *data)
|
|
{
|
|
return data->chip->retrigger(data->irq);
|
|
}
|
|
|
|
static void compat_bus_lock(struct irq_data *data)
|
|
{
|
|
data->chip->bus_lock(data->irq);
|
|
}
|
|
|
|
static void compat_bus_sync_unlock(struct irq_data *data)
|
|
{
|
|
data->chip->bus_sync_unlock(data->irq);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Fixup enable/disable function pointers
|
|
*/
|
|
void irq_chip_set_defaults(struct irq_chip *chip)
|
|
{
|
|
#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
|
|
if (chip->enable)
|
|
chip->irq_enable = compat_irq_enable;
|
|
if (chip->disable)
|
|
chip->irq_disable = compat_irq_disable;
|
|
if (chip->shutdown)
|
|
chip->irq_shutdown = compat_irq_shutdown;
|
|
if (chip->startup)
|
|
chip->irq_startup = compat_irq_startup;
|
|
if (!chip->end)
|
|
chip->end = dummy_irq_chip.end;
|
|
if (chip->bus_lock)
|
|
chip->irq_bus_lock = compat_bus_lock;
|
|
if (chip->bus_sync_unlock)
|
|
chip->irq_bus_sync_unlock = compat_bus_sync_unlock;
|
|
if (chip->mask)
|
|
chip->irq_mask = compat_irq_mask;
|
|
if (chip->unmask)
|
|
chip->irq_unmask = compat_irq_unmask;
|
|
if (chip->ack)
|
|
chip->irq_ack = compat_irq_ack;
|
|
if (chip->mask_ack)
|
|
chip->irq_mask_ack = compat_irq_mask_ack;
|
|
if (chip->eoi)
|
|
chip->irq_eoi = compat_irq_eoi;
|
|
if (chip->set_affinity)
|
|
chip->irq_set_affinity = compat_irq_set_affinity;
|
|
if (chip->set_type)
|
|
chip->irq_set_type = compat_irq_set_type;
|
|
if (chip->set_wake)
|
|
chip->irq_set_wake = compat_irq_set_wake;
|
|
if (chip->retrigger)
|
|
chip->irq_retrigger = compat_irq_retrigger;
|
|
#endif
|
|
}
|
|
|
|
static inline void mask_ack_irq(struct irq_desc *desc)
|
|
{
|
|
if (desc->irq_data.chip->irq_mask_ack)
|
|
desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
|
|
else {
|
|
desc->irq_data.chip->irq_mask(&desc->irq_data);
|
|
if (desc->irq_data.chip->irq_ack)
|
|
desc->irq_data.chip->irq_ack(&desc->irq_data);
|
|
}
|
|
desc->status |= IRQ_MASKED;
|
|
}
|
|
|
|
static inline void mask_irq(struct irq_desc *desc)
|
|
{
|
|
if (desc->irq_data.chip->irq_mask) {
|
|
desc->irq_data.chip->irq_mask(&desc->irq_data);
|
|
desc->status |= IRQ_MASKED;
|
|
}
|
|
}
|
|
|
|
static inline void unmask_irq(struct irq_desc *desc)
|
|
{
|
|
if (desc->irq_data.chip->irq_unmask) {
|
|
desc->irq_data.chip->irq_unmask(&desc->irq_data);
|
|
desc->status &= ~IRQ_MASKED;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* handle_nested_irq - Handle a nested irq from a irq thread
|
|
* @irq: the interrupt number
|
|
*
|
|
* Handle interrupts which are nested into a threaded interrupt
|
|
* handler. The handler function is called inside the calling
|
|
* threads context.
|
|
*/
|
|
void handle_nested_irq(unsigned int irq)
|
|
{
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
struct irqaction *action;
|
|
irqreturn_t action_ret;
|
|
|
|
might_sleep();
|
|
|
|
raw_spin_lock_irq(&desc->lock);
|
|
|
|
kstat_incr_irqs_this_cpu(irq, desc);
|
|
|
|
action = desc->action;
|
|
if (unlikely(!action || (desc->status & IRQ_DISABLED)))
|
|
goto out_unlock;
|
|
|
|
desc->status |= IRQ_INPROGRESS;
|
|
raw_spin_unlock_irq(&desc->lock);
|
|
|
|
action_ret = action->thread_fn(action->irq, action->dev_id);
|
|
if (!noirqdebug)
|
|
note_interrupt(irq, desc, action_ret);
|
|
|
|
raw_spin_lock_irq(&desc->lock);
|
|
desc->status &= ~IRQ_INPROGRESS;
|
|
|
|
out_unlock:
|
|
raw_spin_unlock_irq(&desc->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(handle_nested_irq);
|
|
|
|
static bool irq_check_poll(struct irq_desc *desc)
|
|
{
|
|
if (!(desc->status & IRQ_POLL_INPROGRESS))
|
|
return false;
|
|
return irq_wait_for_poll(desc);
|
|
}
|
|
|
|
/**
|
|
* handle_simple_irq - Simple and software-decoded IRQs.
|
|
* @irq: the interrupt number
|
|
* @desc: the interrupt description structure for this irq
|
|
*
|
|
* Simple interrupts are either sent from a demultiplexing interrupt
|
|
* handler or come from hardware, where no interrupt hardware control
|
|
* is necessary.
|
|
*
|
|
* Note: The caller is expected to handle the ack, clear, mask and
|
|
* unmask issues if necessary.
|
|
*/
|
|
void
|
|
handle_simple_irq(unsigned int irq, struct irq_desc *desc)
|
|
{
|
|
struct irqaction *action;
|
|
irqreturn_t action_ret;
|
|
|
|
raw_spin_lock(&desc->lock);
|
|
|
|
if (unlikely(desc->status & IRQ_INPROGRESS))
|
|
if (!irq_check_poll(desc))
|
|
goto out_unlock;
|
|
|
|
desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
|
|
kstat_incr_irqs_this_cpu(irq, desc);
|
|
|
|
action = desc->action;
|
|
if (unlikely(!action || (desc->status & IRQ_DISABLED)))
|
|
goto out_unlock;
|
|
|
|
desc->status |= IRQ_INPROGRESS;
|
|
raw_spin_unlock(&desc->lock);
|
|
|
|
action_ret = handle_IRQ_event(irq, action);
|
|
if (!noirqdebug)
|
|
note_interrupt(irq, desc, action_ret);
|
|
|
|
raw_spin_lock(&desc->lock);
|
|
desc->status &= ~IRQ_INPROGRESS;
|
|
out_unlock:
|
|
raw_spin_unlock(&desc->lock);
|
|
}
|
|
|
|
/**
|
|
* handle_level_irq - Level type irq handler
|
|
* @irq: the interrupt number
|
|
* @desc: the interrupt description structure for this irq
|
|
*
|
|
* Level type interrupts are active as long as the hardware line has
|
|
* the active level. This may require to mask the interrupt and unmask
|
|
* it after the associated handler has acknowledged the device, so the
|
|
* interrupt line is back to inactive.
|
|
*/
|
|
void
|
|
handle_level_irq(unsigned int irq, struct irq_desc *desc)
|
|
{
|
|
struct irqaction *action;
|
|
irqreturn_t action_ret;
|
|
|
|
raw_spin_lock(&desc->lock);
|
|
mask_ack_irq(desc);
|
|
|
|
if (unlikely(desc->status & IRQ_INPROGRESS))
|
|
if (!irq_check_poll(desc))
|
|
goto out_unlock;
|
|
|
|
desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
|
|
kstat_incr_irqs_this_cpu(irq, desc);
|
|
|
|
/*
|
|
* If its disabled or no action available
|
|
* keep it masked and get out of here
|
|
*/
|
|
action = desc->action;
|
|
if (unlikely(!action || (desc->status & IRQ_DISABLED)))
|
|
goto out_unlock;
|
|
|
|
desc->status |= IRQ_INPROGRESS;
|
|
raw_spin_unlock(&desc->lock);
|
|
|
|
action_ret = handle_IRQ_event(irq, action);
|
|
if (!noirqdebug)
|
|
note_interrupt(irq, desc, action_ret);
|
|
|
|
raw_spin_lock(&desc->lock);
|
|
desc->status &= ~IRQ_INPROGRESS;
|
|
|
|
if (!(desc->status & (IRQ_DISABLED | IRQ_ONESHOT)))
|
|
unmask_irq(desc);
|
|
out_unlock:
|
|
raw_spin_unlock(&desc->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(handle_level_irq);
|
|
|
|
/**
|
|
* handle_fasteoi_irq - irq handler for transparent controllers
|
|
* @irq: the interrupt number
|
|
* @desc: the interrupt description structure for this irq
|
|
*
|
|
* Only a single callback will be issued to the chip: an ->eoi()
|
|
* call when the interrupt has been serviced. This enables support
|
|
* for modern forms of interrupt handlers, which handle the flow
|
|
* details in hardware, transparently.
|
|
*/
|
|
void
|
|
handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
|
|
{
|
|
struct irqaction *action;
|
|
irqreturn_t action_ret;
|
|
|
|
raw_spin_lock(&desc->lock);
|
|
|
|
if (unlikely(desc->status & IRQ_INPROGRESS))
|
|
if (!irq_check_poll(desc))
|
|
goto out;
|
|
|
|
desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
|
|
kstat_incr_irqs_this_cpu(irq, desc);
|
|
|
|
/*
|
|
* If its disabled or no action available
|
|
* then mask it and get out of here:
|
|
*/
|
|
action = desc->action;
|
|
if (unlikely(!action || (desc->status & IRQ_DISABLED))) {
|
|
desc->status |= IRQ_PENDING;
|
|
mask_irq(desc);
|
|
goto out;
|
|
}
|
|
|
|
desc->status |= IRQ_INPROGRESS;
|
|
desc->status &= ~IRQ_PENDING;
|
|
raw_spin_unlock(&desc->lock);
|
|
|
|
action_ret = handle_IRQ_event(irq, action);
|
|
if (!noirqdebug)
|
|
note_interrupt(irq, desc, action_ret);
|
|
|
|
raw_spin_lock(&desc->lock);
|
|
desc->status &= ~IRQ_INPROGRESS;
|
|
out:
|
|
desc->irq_data.chip->irq_eoi(&desc->irq_data);
|
|
|
|
raw_spin_unlock(&desc->lock);
|
|
}
|
|
|
|
/**
|
|
* handle_edge_irq - edge type IRQ handler
|
|
* @irq: the interrupt number
|
|
* @desc: the interrupt description structure for this irq
|
|
*
|
|
* Interrupt occures on the falling and/or rising edge of a hardware
|
|
* signal. The occurence is latched into the irq controller hardware
|
|
* and must be acked in order to be reenabled. After the ack another
|
|
* interrupt can happen on the same source even before the first one
|
|
* is handled by the associated event handler. If this happens it
|
|
* might be necessary to disable (mask) the interrupt depending on the
|
|
* controller hardware. This requires to reenable the interrupt inside
|
|
* of the loop which handles the interrupts which have arrived while
|
|
* the handler was running. If all pending interrupts are handled, the
|
|
* loop is left.
|
|
*/
|
|
void
|
|
handle_edge_irq(unsigned int irq, struct irq_desc *desc)
|
|
{
|
|
raw_spin_lock(&desc->lock);
|
|
|
|
desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
|
|
|
|
/*
|
|
* If we're currently running this IRQ, or its disabled,
|
|
* we shouldn't process the IRQ. Mark it pending, handle
|
|
* the necessary masking and go out
|
|
*/
|
|
if (unlikely((desc->status & (IRQ_INPROGRESS | IRQ_DISABLED)) ||
|
|
!desc->action)) {
|
|
if (!irq_check_poll(desc)) {
|
|
desc->status |= (IRQ_PENDING | IRQ_MASKED);
|
|
mask_ack_irq(desc);
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
kstat_incr_irqs_this_cpu(irq, desc);
|
|
|
|
/* Start handling the irq */
|
|
desc->irq_data.chip->irq_ack(&desc->irq_data);
|
|
|
|
/* Mark the IRQ currently in progress.*/
|
|
desc->status |= IRQ_INPROGRESS;
|
|
|
|
do {
|
|
struct irqaction *action = desc->action;
|
|
irqreturn_t action_ret;
|
|
|
|
if (unlikely(!action)) {
|
|
mask_irq(desc);
|
|
goto out_unlock;
|
|
}
|
|
|
|
/*
|
|
* When another irq arrived while we were handling
|
|
* one, we could have masked the irq.
|
|
* Renable it, if it was not disabled in meantime.
|
|
*/
|
|
if (unlikely((desc->status &
|
|
(IRQ_PENDING | IRQ_MASKED | IRQ_DISABLED)) ==
|
|
(IRQ_PENDING | IRQ_MASKED))) {
|
|
unmask_irq(desc);
|
|
}
|
|
|
|
desc->status &= ~IRQ_PENDING;
|
|
raw_spin_unlock(&desc->lock);
|
|
action_ret = handle_IRQ_event(irq, action);
|
|
if (!noirqdebug)
|
|
note_interrupt(irq, desc, action_ret);
|
|
raw_spin_lock(&desc->lock);
|
|
|
|
} while ((desc->status & (IRQ_PENDING | IRQ_DISABLED)) == IRQ_PENDING);
|
|
|
|
desc->status &= ~IRQ_INPROGRESS;
|
|
out_unlock:
|
|
raw_spin_unlock(&desc->lock);
|
|
}
|
|
|
|
/**
|
|
* handle_percpu_irq - Per CPU local irq handler
|
|
* @irq: the interrupt number
|
|
* @desc: the interrupt description structure for this irq
|
|
*
|
|
* Per CPU interrupts on SMP machines without locking requirements
|
|
*/
|
|
void
|
|
handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
|
|
{
|
|
irqreturn_t action_ret;
|
|
|
|
kstat_incr_irqs_this_cpu(irq, desc);
|
|
|
|
if (desc->irq_data.chip->irq_ack)
|
|
desc->irq_data.chip->irq_ack(&desc->irq_data);
|
|
|
|
action_ret = handle_IRQ_event(irq, desc->action);
|
|
if (!noirqdebug)
|
|
note_interrupt(irq, desc, action_ret);
|
|
|
|
if (desc->irq_data.chip->irq_eoi)
|
|
desc->irq_data.chip->irq_eoi(&desc->irq_data);
|
|
}
|
|
|
|
void
|
|
__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
|
|
const char *name)
|
|
{
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
unsigned long flags;
|
|
|
|
if (!desc) {
|
|
printk(KERN_ERR
|
|
"Trying to install type control for IRQ%d\n", irq);
|
|
return;
|
|
}
|
|
|
|
if (!handle)
|
|
handle = handle_bad_irq;
|
|
else if (desc->irq_data.chip == &no_irq_chip) {
|
|
printk(KERN_WARNING "Trying to install %sinterrupt handler "
|
|
"for IRQ%d\n", is_chained ? "chained " : "", irq);
|
|
/*
|
|
* Some ARM implementations install a handler for really dumb
|
|
* interrupt hardware without setting an irq_chip. This worked
|
|
* with the ARM no_irq_chip but the check in setup_irq would
|
|
* prevent us to setup the interrupt at all. Switch it to
|
|
* dummy_irq_chip for easy transition.
|
|
*/
|
|
desc->irq_data.chip = &dummy_irq_chip;
|
|
}
|
|
|
|
chip_bus_lock(desc);
|
|
raw_spin_lock_irqsave(&desc->lock, flags);
|
|
|
|
/* Uninstall? */
|
|
if (handle == handle_bad_irq) {
|
|
if (desc->irq_data.chip != &no_irq_chip)
|
|
mask_ack_irq(desc);
|
|
desc->status |= IRQ_DISABLED;
|
|
desc->depth = 1;
|
|
}
|
|
desc->handle_irq = handle;
|
|
desc->name = name;
|
|
|
|
if (handle != handle_bad_irq && is_chained) {
|
|
desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE;
|
|
irq_startup(desc);
|
|
}
|
|
raw_spin_unlock_irqrestore(&desc->lock, flags);
|
|
chip_bus_sync_unlock(desc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__set_irq_handler);
|
|
|
|
void
|
|
set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
|
|
irq_flow_handler_t handle)
|
|
{
|
|
set_irq_chip(irq, chip);
|
|
__set_irq_handler(irq, handle, 0, NULL);
|
|
}
|
|
|
|
void
|
|
set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
|
|
irq_flow_handler_t handle, const char *name)
|
|
{
|
|
set_irq_chip(irq, chip);
|
|
__set_irq_handler(irq, handle, 0, name);
|
|
}
|
|
|
|
void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
|
|
{
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
unsigned long flags;
|
|
|
|
if (!desc)
|
|
return;
|
|
|
|
/* Sanitize flags */
|
|
set &= IRQF_MODIFY_MASK;
|
|
clr &= IRQF_MODIFY_MASK;
|
|
|
|
raw_spin_lock_irqsave(&desc->lock, flags);
|
|
desc->status &= ~clr;
|
|
desc->status |= set;
|
|
raw_spin_unlock_irqrestore(&desc->lock, flags);
|
|
}
|