2  * Xen event channels (FIFO-based ABI)
49 #include <xen/xen-ops.h>
75 #define EVTCHN_FIFO_BIT(b, w) \  argument
76     (((unsigned long)w & 0x4UL) ? (EVTCHN_FIFO_ ##b + 32) : EVTCHN_FIFO_ ##b)
81 #define EVTCHN_FIFO_BIT(b, w) EVTCHN_FIFO_ ##b  argument
112 		q->head[i] = 0;  in init_control_block()
149 		return -EINVAL;  in evtchn_fifo_setup()
160 				ret = -ENOMEM;  in evtchn_fifo_setup()
191 	/* no-op */  in evtchn_fifo_bind_to_cpu()
273 static void consume_one_event(unsigned cpu, struct evtchn_loop_ctrl *ctrl,  in consume_one_event()  argument
282 	head = q->head[priority];  in consume_one_event()
289 		virt_rmb(); /* Ensure word is up-to-date before reading head. */  in consume_one_event()
290 		head = control_block->head[priority];  in consume_one_event()
298 	 * If the link is non-zero, there are more events in the  in consume_one_event()
308 		if (unlikely(!ctrl))  in consume_one_event()
311 			handle_irq_for_port(port, ctrl);  in consume_one_event()
314 	q->head[priority] = head;  in consume_one_event()
318 					struct evtchn_loop_ctrl *ctrl)  in __evtchn_fifo_handle_events()  argument
326 	ready = xchg(&control_block->ready, 0);  in __evtchn_fifo_handle_events()
330 		consume_one_event(cpu, ctrl, control_block, q, &ready);  in __evtchn_fifo_handle_events()
331 		ready |= xchg(&control_block->ready, 0);  in __evtchn_fifo_handle_events()
336 				      struct evtchn_loop_ctrl *ctrl)  in evtchn_fifo_handle_events()  argument
338 	__evtchn_fifo_handle_events(cpu, ctrl);  in evtchn_fifo_handle_events()
378 	int ret = -ENOMEM;  in evtchn_fifo_alloc_control_block()
435 	pr_info("Using FIFO-based ABI\n");  in xen_evtchn_fifo_init()