mirror of
https://gitee.com/bianbu-linux/linux-6.6
synced 2025-07-06 00:13:38 -04:00
dde8b58d51
Add a pseudo RTC that simply is able to send an alarm signal waking up the system at a given time in the future. Since apparently timerfd_create() FDs don't support SIGIO, we use the sigio-creating helper thread, which just learned to do suspend/resume properly in the previous patch. For time-travel mode, OTOH, just add an event at the specified time in the future, and that's already sufficient to wake up the system at that point in time since suspend will just be in an "endless wait". For s2idle support also call pm_system_wakeup(). Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Richard Weinberger <richard@nod.at>
101 lines
2.3 KiB
C
101 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2012 - 2014 Cisco Systems
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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*/
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#ifndef __TIMER_INTERNAL_H__
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#define __TIMER_INTERNAL_H__
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#include <linux/list.h>
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#include <asm/bug.h>
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#define TIMER_MULTIPLIER 256
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#define TIMER_MIN_DELTA 500
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enum time_travel_mode {
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TT_MODE_OFF,
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TT_MODE_BASIC,
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TT_MODE_INFCPU,
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TT_MODE_EXTERNAL,
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};
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#ifdef CONFIG_UML_TIME_TRAVEL_SUPPORT
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struct time_travel_event {
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unsigned long long time;
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void (*fn)(struct time_travel_event *d);
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struct list_head list;
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bool pending, onstack;
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};
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extern enum time_travel_mode time_travel_mode;
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void time_travel_sleep(void);
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static inline void
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time_travel_set_event_fn(struct time_travel_event *e,
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void (*fn)(struct time_travel_event *d))
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{
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e->fn = fn;
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}
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void __time_travel_propagate_time(void);
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static inline void time_travel_propagate_time(void)
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{
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if (time_travel_mode == TT_MODE_EXTERNAL)
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__time_travel_propagate_time();
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}
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void __time_travel_wait_readable(int fd);
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static inline void time_travel_wait_readable(int fd)
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{
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if (time_travel_mode == TT_MODE_EXTERNAL)
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__time_travel_wait_readable(fd);
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}
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void time_travel_add_irq_event(struct time_travel_event *e);
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void time_travel_add_event_rel(struct time_travel_event *e,
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unsigned long long delay_ns);
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bool time_travel_del_event(struct time_travel_event *e);
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#else
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struct time_travel_event {
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};
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#define time_travel_mode TT_MODE_OFF
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static inline void time_travel_sleep(void)
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{
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}
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/* this is a macro so the event/function need not exist */
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#define time_travel_set_event_fn(e, fn) do {} while (0)
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static inline void time_travel_propagate_time(void)
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{
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}
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static inline void time_travel_wait_readable(int fd)
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{
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}
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static inline void time_travel_add_irq_event(struct time_travel_event *e)
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{
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WARN_ON(1);
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}
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/*
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* not inlines so the data structure need not exist,
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* cause linker failures
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*/
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extern void time_travel_not_configured(void);
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#define time_travel_add_event_rel(...) time_travel_not_configured()
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#define time_travel_del_event(...) time_travel_not_configured()
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#endif /* CONFIG_UML_TIME_TRAVEL_SUPPORT */
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/*
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* Without CONFIG_UML_TIME_TRAVEL_SUPPORT this is a linker error if used,
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* which is intentional since we really shouldn't link it in that case.
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*/
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void time_travel_ndelay(unsigned long nsec);
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#endif /* __TIMER_INTERNAL_H__ */
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