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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2001, 2002 Jeff Dike ([email protected])
*/
#ifndef __IRQ_KERN_H__
#define __IRQ_KERN_H__
#include <linux/interrupt.h>
#include <linux/time-internal.h>
#include <asm/ptrace.h>
#include "irq_user.h"
#define UM_IRQ_ALLOC -1
int um_request_irq(int irq, int fd, enum um_irq_type type,
irq_handler_t handler, unsigned long irqflags,
const char *devname, void *dev_id);
#ifdef CONFIG_UML_TIME_TRAVEL_SUPPORT
/**
* um_request_irq_tt - request an IRQ with timetravel handler
*
* @irq: the IRQ number, or %UM_IRQ_ALLOC
* @fd: The file descriptor to request an IRQ for
* @type: read or write
* @handler: the (generic style) IRQ handler
* @irqflags: Linux IRQ flags
* @devname: name for this to show
* @dev_id: data pointer to pass to the IRQ handler
* @timetravel_handler: the timetravel interrupt handler, invoked with the IRQ
* number, fd, dev_id and time-travel event pointer.
*
* Returns: The interrupt number assigned or a negative error.
*
* Note that the timetravel handler is invoked only if the time_travel_mode is
* %TT_MODE_EXTERNAL, and then it is invoked even while the system is suspended!
* This function must call time_travel_add_irq_event() for the event passed with
* an appropriate delay, before sending an ACK on the socket it was invoked for.
*
* If this was called while the system is suspended, then adding the event will
* cause the system to resume.
*
* Since this function will almost certainly have to handle the FD's condition,
* a read will consume the message, and after that it is up to the code using
* it to pass such a message to the @handler in whichever way it can.
*
* If time_travel_mode is not %TT_MODE_EXTERNAL the @timetravel_handler will
* not be invoked at all and the @handler must handle the FD becoming
* readable (or writable) instead. Use um_irq_timetravel_handler_used() to
* distinguish these cases.
*
* See virtio_uml.c for an example.
*/
int um_request_irq_tt(int irq, int fd, enum um_irq_type type,
irq_handler_t handler, unsigned long irqflags,
const char *devname, void *dev_id,
void (*timetravel_handler)(int, int, void *,
struct time_travel_event *));
#else
static inline
int um_request_irq_tt(int irq, int fd, enum um_irq_type type,
irq_handler_t handler, unsigned long irqflags,
const char *devname, void *dev_id,
void (*timetravel_handler)(int, int, void *,
struct time_travel_event *))
{
return um_request_irq(irq, fd, type, handler, irqflags,
devname, dev_id);
}
#endif
static inline bool um_irq_timetravel_handler_used(void)
{
return time_travel_mode == TT_MODE_EXTERNAL;
}
void um_free_irq(int irq, void *dev_id);
#endif
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