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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/um/include/shared/irq_kern.h | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/um/include/shared/irq_kern.h')
-rw-r--r-- | arch/um/include/shared/irq_kern.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/arch/um/include/shared/irq_kern.h b/arch/um/include/shared/irq_kern.h new file mode 100644 index 000000000..f2dc817ab --- /dev/null +++ b/arch/um/include/shared/irq_kern.h @@ -0,0 +1,79 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com) + */ + +#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 |