internals.h

/*
 * IRQ subsystem internal functions and variables:
 *
 * Do not ever include this file from anything else than
 * kernel/irq/. Do not even think about using any information outside
 * of this file for your non core code.
 */
#include <linux/irqdesc.h>

#ifdef CONFIG_SPARSE_IRQ
# define IRQ_BITMAP_BITS	(NR_IRQS + 8196)
#else
# define IRQ_BITMAP_BITS	NR_IRQS
#endif

#include "compat.h"
#include "settings.h"

#define istate core_internal_state__do_not_mess_with_it

extern int noirqdebug;

/*
 * Bits used by threaded handlers:
 * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
 * IRQTF_DIED      - handler thread died
 * IRQTF_WARNED    - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
 * IRQTF_AFFINITY  - irq thread is requested to adjust affinity
 */
enum {
	IRQTF_RUNTHREAD,
	IRQTF_DIED,
	IRQTF_WARNED,
	IRQTF_AFFINITY,
};

/*
 * Bit masks for desc->state
 *
 * IRQS_AUTODETECT		- autodetection in progress
 * IRQS_SPURIOUS_DISABLED	- was disabled due to spurious interrupt
 *				  detection
 * IRQS_POLL_INPROGRESS		- polling in progress
 * IRQS_INPROGRESS		- Interrupt in progress
 * IRQS_ONESHOT			- irq is not unmasked in primary handler
 */
enum {
	IRQS_AUTODETECT		= 0x00000001,
	IRQS_SPURIOUS_DISABLED	= 0x00000002,
	IRQS_POLL_INPROGRESS	= 0x00000008,
	IRQS_INPROGRESS		= 0x00000010,
	IRQS_ONESHOT		= 0x00000020,
};

#define irq_data_to_desc(data)	container_of(data, struct irq_desc, irq_data)

/* Set default functions for irq_chip structures: */
extern void irq_chip_set_defaults(struct irq_chip *chip);

/* Set default handler: */
extern void compat_irq_chip_set_default_handler(struct irq_desc *desc);

extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
		unsigned long flags);
extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp);
extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume);

extern int irq_startup(struct irq_desc *desc);
extern void irq_shutdown(struct irq_desc *desc);
extern void irq_enable(struct irq_desc *desc);
extern void irq_disable(struct irq_desc *desc);

extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);

irqreturn_t handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action);
irqreturn_t handle_irq_event(struct irq_desc *desc);

/* Resending of interrupts :*/
void check_irq_resend(struct irq_desc *desc, unsigned int irq);
bool irq_wait_for_poll(struct irq_desc *desc);

#ifdef CONFIG_PROC_FS
extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
extern void register_handler_proc(unsigned int irq, struct irqaction *action);
extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
#else
static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
static inline void register_handler_proc(unsigned int irq,
					 struct irqaction *action) { }
static inline void unregister_handler_proc(unsigned int irq,
					   struct irqaction *action) { }
#endif

extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);

extern void irq_set_thread_affinity(struct irq_desc *desc);

/* Inline functions for support of irq chips on slow busses */
static inline void chip_bus_lock(struct irq_desc *desc)
{
	if (unlikely(desc->irq_data.chip->irq_bus_lock))
		desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
}

static inline void chip_bus_sync_unlock(struct irq_desc *desc)
{
	if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
		desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
}

/*
 * Debugging printout:
 */

#include <linux/kallsyms.h>

#define P(f) if (desc->status & f) printk("%14s set\n", #f)
#define PS(f) if (desc->istate & f) printk("%14s set\n", #f)

static inline void print_irq_desc(unsigned int irq, struct irq_desc *desc)
{
	printk("irq %d, desc: %p, depth: %d, count: %d, unhandled: %d\n",
		irq, desc, desc->depth, desc->irq_count, desc->irqs_unhandled);
	printk("->handle_irq():  %p, ", desc->handle_irq);
	print_symbol("%s\n", (unsigned long)desc->handle_irq);
	printk("->irq_data.chip(): %p, ", desc->irq_data.chip);
	print_symbol("%s\n", (unsigned long)desc->irq_data.chip);
	printk("->action(): %p\n", desc->action);
	if (desc->action) {
		printk("->action->handler(): %p, ", desc->action->handler);
		print_symbol("%s\n", (unsigned long)desc->action->handler);
	}

	P(IRQ_DISABLED);
	P(IRQ_PENDING);
	P(IRQ_REPLAY);
	P(IRQ_WAITING);
	P(IRQ_LEVEL);
	P(IRQ_MASKED);
#ifdef CONFIG_IRQ_PER_CPU
	P(IRQ_PER_CPU);
#endif
	P(IRQ_NOPROBE);
	P(IRQ_NOREQUEST);
	P(IRQ_NOAUTOEN);

	PS(IRQS_AUTODETECT);
	PS(IRQS_INPROGRESS);
}

#undef P
#undef PS