22 #include <linux/time-internal.h>
48 		panic("time-travel: time goes backwards %lld -> %lld\n",  in time_travel_set_time()
85 		panic("time-travel external link is broken\n");  in time_travel_handle_message()
87 		panic("invalid time-travel message - %d bytes\n", ret);  in time_travel_handle_message()
91 		WARN_ONCE(1, "time-travel: unexpected message %lld\n",  in time_travel_handle_message()
97 		time_travel_set_time(msg->time);  in time_travel_handle_message()
101 		time_travel_ext_free_until = msg->time;  in time_travel_handle_message()
109 static u64 time_travel_ext_req(u32 op, u64 time)  in time_travel_ext_req()  argument
115 		.time = time,  in time_travel_ext_req()
129 	 * current time (for UM_TIMETRAVEL_GET) and getting another  in time_travel_ext_req()
130 	 * ACK without a time would confuse us a lot!  in time_travel_ext_req()
142 		panic("time-travel: ACK message has different seqno! op=%d, seq=%d != %d time=%lld\n",  in time_travel_ext_req()
143 		      msg.op, msg.seq, mseq, msg.time);  in time_travel_ext_req()
146 		time_travel_set_time(msg.time);  in time_travel_ext_req()
149 	return msg.time;  in time_travel_ext_req()
169 static void time_travel_ext_update_request(unsigned long long time)  in time_travel_ext_update_request()  argument
174 	/* asked for exactly this time previously */  in time_travel_ext_update_request()
176 	    time == time_travel_ext_prev_request)  in time_travel_ext_update_request()
184 	    time < time_travel_ext_free_until)  in time_travel_ext_update_request()
187 	time_travel_ext_prev_request = time;  in time_travel_ext_update_request()
189 	time_travel_ext_req(UM_TIMETRAVEL_REQUEST, time);  in time_travel_ext_update_request()
205 static bool time_travel_ext_request(unsigned long long time)  in time_travel_ext_request()  argument
213 	    time < time_travel_ext_free_until)  in time_travel_ext_request()
216 	time_travel_ext_update_request(time);  in time_travel_ext_request()
269 				    unsigned long long time)  in __time_travel_add_event()  argument
279 	e->time = time;  in __time_travel_add_event()
284 		 * Add the new entry before one with higher time,  in __time_travel_add_event()
290 		if ((tmp->time > e->time) ||  in __time_travel_add_event()
291 		    (tmp->time == e->time && tmp->onstack && e->onstack)) {  in __time_travel_add_event()
302 	time_travel_ext_update_request(tmp->time);  in __time_travel_add_event()
303 	time_travel_next_event = tmp->time;  in __time_travel_add_event()
308 				  unsigned long long time)  in time_travel_add_event()  argument
313 	__time_travel_add_event(e, time);  in time_travel_add_event()
410 		__time_travel_update_time(e->time, idle);  in time_travel_update_time()
415 			BUG_ON(time_travel_time != e->time);  in time_travel_update_time()
421 					panic("On-stack event dequeued outside of the stack! time=%lld, event time=%lld, event=%pS\n",  in time_travel_update_time()
422 					      time_travel_time, e->time, e);  in time_travel_update_time()
429 			time_travel_ext_update_request(e->time);  in time_travel_update_time()
440 	 * Disable interrupts before calculating the new time so  in time_travel_update_time_rel()
442 	 * a bad time e.g. after we read time_travel_time but  in time_travel_update_time_rel()
443 	 * before we've completed updating the time.  in time_travel_update_time_rel()
469 	 * same time (again) to run the interrupt...  in time_travel_add_irq_event()
503 			os_timer_one_shot(time_travel_timer_event.time - next);  in time_travel_sleep()
539 			panic("time-travel: invalid external ID in string '%s'\n",  in time_travel_connect_external()
549 		panic("time-travel: failed to connect to external socket %s\n",  in time_travel_connect_external()
569 		/* controller gave us the *current* time, so adjust by that */  in time_travel_set_start()
612 extern u64 time_travel_ext_req(u32 op, u64 time);
615 #define time_travel_add_event(e, time) do { } while (0)  argument
626 	 * In basic time-travel mode we still get real interrupts  in timer_handler()
627 	 * (signals) but since we don't read time from the OS, we  in timer_handler()
628 	 * must update the simulated time here to the expiry when  in timer_handler()
735 		 * stuck in loops that expect time to move more than the  in timer_read()
819 		timer_clockevent.name = "time-travel-timer-infcpu";  in setup_time_travel()
820 		timer_clocksource.name = "time-travel-clock";  in setup_time_travel()
826 		timer_clockevent.name = "time-travel-timer-external";  in setup_time_travel()
827 		timer_clocksource.name = "time-travel-clock-external";  in setup_time_travel()
833 		timer_clockevent.name = "time-travel-timer";  in setup_time_travel()
834 		timer_clocksource.name = "time-travel-clock";  in setup_time_travel()
841 __setup("time-travel", setup_time_travel);
843 "time-travel\n"
844 "This option just enables basic time travel mode, in which the clock/timers\n"
846 "waiting for real time to elapse. However, instance CPU speed is limited by\n"
850 "time-travel=inf-cpu\n"
851 "This enables time travel mode with infinite processing power, in which there\n"
857 "time-travel=ext:[ID:]/path/to/socket\n"
858 "This enables time travel mode similar to =inf-cpu, except the system will\n"
860 "have more than one system simultaneously be on simulated time. The virtio\n"
877 __setup("time-travel-start", setup_time_travel_start);
879 "time-travel-start=<seconds>\n"
881 "the host's wall clock at the time of UML boot.\n");