struct irq_desc *
__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus)
{
struct irq_desc *desc = irq_to_desc(irq);
if (desc) {
if (bus)
chip_bus_lock(desc);
raw_spin_lock_irqsave(&desc->lock, *flags);
}
return desc;
}
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);
handle = __fixup_irq_handler(desc, handle, is_chained);
/* 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_DISABLED;
desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE;
desc->depth = 0;
desc->irq_data.chip->irq_startup(&desc->irq_data);
}
raw_spin_unlock_irqrestore(&desc->lock, flags);
chip_bus_sync_unlock(desc);
}
/**
* disable_irq_nosync - disable an irq without waiting
* @irq: Interrupt to disable
*
* Disable the selected interrupt line. Disables and Enables are
* nested.
* Unlike disable_irq(), this function does not ensure existing
* instances of the IRQ handler have completed before returning.
*
* This function may be called from IRQ context.
*/
void disable_irq_nosync(unsigned int irq)
{
struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
if (!desc)
return;
chip_bus_lock(desc);
raw_spin_lock_irqsave(&desc->lock, flags);
__disable_irq(desc, irq, false);
raw_spin_unlock_irqrestore(&desc->lock, flags);
chip_bus_sync_unlock(desc);
}
/**
* irq_read_line - read the value on an irq line
* @irq: Interrupt number representing a hardware line
*
* This function is meant to be called from within the irq handler.
* Slowbus irq controllers might sleep, but it is assumed that the irq
* handler for slowbus interrupts will execute in thread context, so
* sleeping is okay.
*/
int irq_read_line(unsigned int irq)
{
struct irq_desc *desc = irq_to_desc(irq);
int val;
if (!desc || !desc->irq_data.chip->irq_read_line)
return -EINVAL;
chip_bus_lock(desc);
raw_spin_lock(&desc->lock);
val = desc->irq_data.chip->irq_read_line(&desc->irq_data);
raw_spin_unlock(&desc->lock);
chip_bus_sync_unlock(desc);
return val;
}
/* Henry [email protected] set tg irq status */ int set_tg_irq_status(unsigned int irq, bool enable) { struct irq_desc *desc = irq_to_desc(irq); unsigned long flags; int value; if (!desc) return 0xffffffff; chip_bus_lock(irq, desc); raw_spin_lock_irqsave(&desc->lock, flags); value=__set_tg_irq_status(desc, irq, enable); raw_spin_unlock_irqrestore(&desc->lock, flags); chip_bus_sync_unlock(irq, desc); }
/**
* enable_irq - enable handling of an irq
* @irq: Interrupt to enable
*
* Undoes the effect of one call to disable_irq(). If this
* matches the last disable, processing of interrupts on this
* IRQ line is re-enabled.
*
* This function may be called from IRQ context only when
* desc->irq_data.chip->bus_lock and desc->chip->bus_sync_unlock are NULL !
*/
void enable_irq(unsigned int irq)
{
struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
if (!desc)
return;
if (WARN(!desc->irq_data.chip || !desc->irq_data.chip->irq_enable,
KERN_ERR "enable_irq before setup/request_irq: irq %u\n", irq))
return;
chip_bus_lock(desc);
raw_spin_lock_irqsave(&desc->lock, flags);
__enable_irq(desc, irq, false);
raw_spin_unlock_irqrestore(&desc->lock, flags);
chip_bus_sync_unlock(desc);
}
// ARM10C 20141122
// irq: 16, flags: &flags, false, check: 0
// ARM10C 20141122
// irq: 16, flags: &flags, true, check: 0
struct irq_desc *
__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
unsigned int check)
{
// irq: 16, irq_to_desc(16): kmem_cache#28-oX (irq 16)
// irq: 16, irq_to_desc(16): kmem_cache#28-oX (irq 16)
struct irq_desc *desc = irq_to_desc(irq);
// desc: kmem_cache#28-oX (irq 16)
// desc: kmem_cache#28-oX (irq 16)
// desc: kmem_cache#28-oX (irq 16)
// desc: kmem_cache#28-oX (irq 16)
if (desc) {
// check: 0, _IRQ_DESC_CHECK: 1
// check: 0, _IRQ_DESC_CHECK: 1
if (check & _IRQ_DESC_CHECK) {
if ((check & _IRQ_DESC_PERCPU) &&
!irq_settings_is_per_cpu_devid(desc))
return NULL;
if (!(check & _IRQ_DESC_PERCPU) &&
irq_settings_is_per_cpu_devid(desc))
return NULL;
}
// bus: false
// bus: true
if (bus)
// desc: kmem_cache#28-oX (irq 16)
chip_bus_lock(desc);
// &desc->lock: &(kmem_cache#28-oX (irq 16))->lock, *flags: flags
// &desc->lock: &(kmem_cache#28-oX (irq 16))->lock, *flags: flags
raw_spin_lock_irqsave(&desc->lock, *flags);
// &(kmem_cache#28-oX (irq 16))->lock을 사용하여 spinlock을 설정하고 cpsr을 flags에 저장
// &(kmem_cache#28-oX (irq 16))->lock을 사용하여 spinlock을 설정하고 cpsr을 flags에 저장
}
// desc: kmem_cache#28-oX (irq 16)
// desc: kmem_cache#28-oX (irq 16)
return desc;
// return kmem_cache#28-oX (irq 16)
// return kmem_cache#28-oX (irq 16)
}
/*
* 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.
*/
bool handle_nested_irq(unsigned int irq)
{
struct irq_desc *desc = irq_to_desc(irq);
struct irqaction *action;
int mask_this_irq = 0;
irqreturn_t action_ret;
bool handled = false;
might_sleep();
raw_spin_lock_irq(&desc->lock);
desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
kstat_incr_irqs_this_cpu(irq, desc);
action = desc->action;
if (unlikely(!action || irqd_irq_disabled(&desc->irq_data))) {
desc->istate |= IRQS_PENDING;
mask_this_irq = 1;
goto out_unlock;
}
irqd_set(&desc->irq_data, IRQD_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);
irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
handled = true;
out_unlock:
raw_spin_unlock_irq(&desc->lock);
if (unlikely(mask_this_irq)) {
chip_bus_lock(desc);
mask_irq(desc);
chip_bus_sync_unlock(desc);
}
return handled;
}
/*
* 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;
int mask_this_irq = 0;
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))) {
mask_this_irq = 1;
if (!(desc->status & IRQ_LEVEL))
desc->status |= IRQ_PENDING;
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:
if (unlikely(mask_this_irq)) {
chip_bus_lock(irq, desc);
mask_irq(desc, irq);
chip_bus_sync_unlock(irq, desc);
}
raw_spin_unlock_irq(&desc->lock);
}
struct irq_desc *
__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
unsigned int check)
{
struct irq_desc *desc = irq_to_desc(irq);
if (desc) {
if (check & _IRQ_DESC_CHECK) {
if ((check & _IRQ_DESC_PERCPU) &&
!irq_settings_is_per_cpu_devid(desc))
return NULL;
if (!(check & _IRQ_DESC_PERCPU) &&
irq_settings_is_per_cpu_devid(desc))
return NULL;
}
if (bus)
chip_bus_lock(desc);
raw_spin_lock_irqsave(&desc->lock, *flags);
}
return desc;
}
