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