22 #include <linux/time-internal.h>
47 		panic("time-travel: time goes backwards %lld -> %lld\n",  in time_travel_set_time()
89 		panic("time-travel external link is broken\n");  in time_travel_handle_message()
91 		panic("invalid time-travel message - %d bytes\n", ret);  in time_travel_handle_message()
95 		WARN_ONCE(1, "time-travel: unexpected message %lld\n",  in time_travel_handle_message()
101 		time_travel_set_time(msg->time);  in time_travel_handle_message()
105 		time_travel_ext_free_until = msg->time;  in time_travel_handle_message()
113 static u64 time_travel_ext_req(u32 op, u64 time)  in time_travel_ext_req()  argument
119 		.time = time,  in time_travel_ext_req()
133 	 * current time (for UM_TIMETRAVEL_GET) and getting another  in time_travel_ext_req()
134 	 * ACK without a time would confuse us a lot!  in time_travel_ext_req()
146 		panic("time-travel: ACK message has different seqno! op=%d, seq=%d != %d time=%lld\n",  in time_travel_ext_req()
147 		      msg.op, msg.seq, mseq, msg.time);  in time_travel_ext_req()
150 		time_travel_set_time(msg.time);  in time_travel_ext_req()
153 	return msg.time;  in time_travel_ext_req()
173 static void time_travel_ext_update_request(unsigned long long time)  in time_travel_ext_update_request()  argument
178 	/* asked for exactly this time previously */  in time_travel_ext_update_request()
180 	    time == time_travel_ext_prev_request)  in time_travel_ext_update_request()
183 	time_travel_ext_prev_request = time;  in time_travel_ext_update_request()
185 	time_travel_ext_req(UM_TIMETRAVEL_REQUEST, time);  in time_travel_ext_update_request()
195 static bool time_travel_ext_request(unsigned long long time)  in time_travel_ext_request()  argument
203 	    time < time_travel_ext_free_until)  in time_travel_ext_request()
206 	time_travel_ext_update_request(time);  in time_travel_ext_request()
258 				    unsigned long long time)  in __time_travel_add_event()  argument
272 	e->time = time;  in __time_travel_add_event()
276 		 * Add the new entry before one with higher time,  in __time_travel_add_event()
282 		if ((tmp->time > e->time) ||  in __time_travel_add_event()
283 		    (tmp->time == e->time && tmp->onstack && e->onstack)) {  in __time_travel_add_event()
294 	time_travel_ext_update_request(tmp->time);  in __time_travel_add_event()
295 	time_travel_next_event = tmp->time;  in __time_travel_add_event()
299 				  unsigned long long time)  in time_travel_add_event()  argument
304 	__time_travel_add_event(e, time);  in time_travel_add_event()
357 		__time_travel_update_time(e->time, idle);  in time_travel_update_time()
362 			BUG_ON(time_travel_time != e->time);  in time_travel_update_time()
368 					panic("On-stack event dequeued outside of the stack! time=%lld, event time=%lld, event=%pS\n",  in time_travel_update_time()
369 					      time_travel_time, e->time, e);  in time_travel_update_time()
376 			time_travel_ext_update_request(e->time);  in time_travel_update_time()
396 	 * same time (again) to run the interrupt...  in time_travel_add_irq_event()
425 			os_timer_one_shot(time_travel_timer_event.time - next);  in time_travel_sleep()
461 			panic("time-travel: invalid external ID in string '%s'\n",  in time_travel_connect_external()
471 		panic("time-travel: failed to connect to external socket %s\n",  in time_travel_connect_external()
500 extern u64 time_travel_ext_req(u32 op, u64 time);
503 #define time_travel_add_event(e, time) do { } while (0)  argument
512 	 * In basic time-travel mode we still get real interrupts  in timer_handler()
513 	 * (signals) but since we don't read time from the OS, we  in timer_handler()
514 	 * must update the simulated time here to the expiry when  in timer_handler()
621 		 * stuck in loops that expect time to move more than the  in timer_read()
706 		timer_clockevent.name = "time-travel-timer-infcpu";  in setup_time_travel()
707 		timer_clocksource.name = "time-travel-clock";  in setup_time_travel()
713 		timer_clockevent.name = "time-travel-timer-external";  in setup_time_travel()
714 		timer_clocksource.name = "time-travel-clock-external";  in setup_time_travel()
720 		timer_clockevent.name = "time-travel-timer";  in setup_time_travel()
721 		timer_clocksource.name = "time-travel-clock";  in setup_time_travel()
728 __setup("time-travel", setup_time_travel);
730 "time-travel\n"
731 "This option just enables basic time travel mode, in which the clock/timers\n"
733 "waiting for real time to elapse. However, instance CPU speed is limited by\n"
737 "time-travel=inf-cpu\n"
738 "This enables time travel mode with infinite processing power, in which there\n"
744 "time-travel=ext:[ID:]/path/to/socket\n"
745 "This enables time travel mode similar to =inf-cpu, except the system will\n"
747 "have more than one system simultaneously be on simulated time. The virtio\n"
764 __setup("time-travel-start", setup_time_travel_start);
766 "time-travel-start=<seconds>\n"
768 "the host's wall clock at the time of UML boot.\n");