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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