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21#include "qemu/osdep.h"
22#include "qapi/error.h"
23#include "qemu/iov.h"
24#include "monitor/monitor.h"
25#include "qemu/error-report.h"
26#include "qemu/queue.h"
27#include "hw/sysbus.h"
28#include "trace.h"
29#include "hw/virtio/virtio-serial.h"
30#include "hw/virtio/virtio-access.h"
31
32static struct VirtIOSerialDevices {
33 QLIST_HEAD(, VirtIOSerial) devices;
34} vserdevices;
35
36static VirtIOSerialPort *find_port_by_id(VirtIOSerial *vser, uint32_t id)
37{
38 VirtIOSerialPort *port;
39
40 if (id == VIRTIO_CONSOLE_BAD_ID) {
41 return NULL;
42 }
43
44 QTAILQ_FOREACH(port, &vser->ports, next) {
45 if (port->id == id)
46 return port;
47 }
48 return NULL;
49}
50
51static VirtIOSerialPort *find_port_by_vq(VirtIOSerial *vser, VirtQueue *vq)
52{
53 VirtIOSerialPort *port;
54
55 QTAILQ_FOREACH(port, &vser->ports, next) {
56 if (port->ivq == vq || port->ovq == vq)
57 return port;
58 }
59 return NULL;
60}
61
62static VirtIOSerialPort *find_port_by_name(char *name)
63{
64 VirtIOSerial *vser;
65
66 QLIST_FOREACH(vser, &vserdevices.devices, next) {
67 VirtIOSerialPort *port;
68
69 QTAILQ_FOREACH(port, &vser->ports, next) {
70 if (port->name && !strcmp(port->name, name)) {
71 return port;
72 }
73 }
74 }
75 return NULL;
76}
77
78static VirtIOSerialPort *find_first_connected_console(VirtIOSerial *vser)
79{
80 VirtIOSerialPort *port;
81
82 QTAILQ_FOREACH(port, &vser->ports, next) {
83 VirtIOSerialPortClass const *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
84 if (vsc->is_console && port->host_connected) {
85 return port;
86 }
87 }
88 return NULL;
89}
90
91static bool use_multiport(VirtIOSerial *vser)
92{
93 VirtIODevice *vdev = VIRTIO_DEVICE(vser);
94 return virtio_vdev_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT);
95}
96
97static size_t write_to_port(VirtIOSerialPort *port,
98 const uint8_t *buf, size_t size)
99{
100 VirtQueueElement *elem;
101 VirtQueue *vq;
102 size_t offset;
103
104 vq = port->ivq;
105 if (!virtio_queue_ready(vq)) {
106 return 0;
107 }
108
109 offset = 0;
110 while (offset < size) {
111 size_t len;
112
113 elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
114 if (!elem) {
115 break;
116 }
117
118 len = iov_from_buf(elem->in_sg, elem->in_num, 0,
119 buf + offset, size - offset);
120 offset += len;
121
122 virtqueue_push(vq, elem, len);
123 g_free(elem);
124 }
125
126 virtio_notify(VIRTIO_DEVICE(port->vser), vq);
127 return offset;
128}
129
130static void discard_vq_data(VirtQueue *vq, VirtIODevice *vdev)
131{
132 VirtQueueElement *elem;
133
134 if (!virtio_queue_ready(vq)) {
135 return;
136 }
137 for (;;) {
138 elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
139 if (!elem) {
140 break;
141 }
142 virtqueue_push(vq, elem, 0);
143 g_free(elem);
144 }
145 virtio_notify(vdev, vq);
146}
147
148static void discard_throttle_data(VirtIOSerialPort *port)
149{
150 if (port->elem) {
151 virtqueue_detach_element(port->ovq, port->elem, 0);
152 g_free(port->elem);
153 port->elem = NULL;
154 }
155}
156
157static void do_flush_queued_data(VirtIOSerialPort *port, VirtQueue *vq,
158 VirtIODevice *vdev)
159{
160 VirtIOSerialPortClass *vsc;
161
162 assert(port);
163 assert(virtio_queue_ready(vq));
164
165 vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
166
167 while (!port->throttled) {
168 unsigned int i;
169
170
171 if (!port->elem) {
172 port->elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
173 if (!port->elem) {
174 break;
175 }
176 port->iov_idx = 0;
177 port->iov_offset = 0;
178 }
179
180 for (i = port->iov_idx; i < port->elem->out_num; i++) {
181 size_t buf_size;
182 ssize_t ret;
183
184 buf_size = port->elem->out_sg[i].iov_len - port->iov_offset;
185 ret = vsc->have_data(port,
186 port->elem->out_sg[i].iov_base
187 + port->iov_offset,
188 buf_size);
189 if (!port->elem) {
190 return;
191 }
192 if (port->throttled) {
193 port->iov_idx = i;
194 if (ret > 0) {
195 port->iov_offset += ret;
196 }
197 break;
198 }
199 port->iov_offset = 0;
200 }
201 if (port->throttled) {
202 break;
203 }
204 virtqueue_push(vq, port->elem, 0);
205 g_free(port->elem);
206 port->elem = NULL;
207 }
208 virtio_notify(vdev, vq);
209}
210
211static void flush_queued_data(VirtIOSerialPort *port)
212{
213 assert(port);
214
215 if (!virtio_queue_ready(port->ovq)) {
216 return;
217 }
218 do_flush_queued_data(port, port->ovq, VIRTIO_DEVICE(port->vser));
219}
220
221static size_t send_control_msg(VirtIOSerial *vser, void *buf, size_t len)
222{
223 VirtQueueElement *elem;
224 VirtQueue *vq;
225
226 vq = vser->c_ivq;
227 if (!virtio_queue_ready(vq)) {
228 return 0;
229 }
230
231 elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
232 if (!elem) {
233 return 0;
234 }
235
236
237 iov_from_buf(elem->in_sg, elem->in_num, 0, buf, len);
238
239 virtqueue_push(vq, elem, len);
240 virtio_notify(VIRTIO_DEVICE(vser), vq);
241 g_free(elem);
242
243 return len;
244}
245
246static size_t send_control_event(VirtIOSerial *vser, uint32_t port_id,
247 uint16_t event, uint16_t value)
248{
249 VirtIODevice *vdev = VIRTIO_DEVICE(vser);
250 struct virtio_console_control cpkt;
251
252 virtio_stl_p(vdev, &cpkt.id, port_id);
253 virtio_stw_p(vdev, &cpkt.event, event);
254 virtio_stw_p(vdev, &cpkt.value, value);
255
256 trace_virtio_serial_send_control_event(port_id, event, value);
257 return send_control_msg(vser, &cpkt, sizeof(cpkt));
258}
259
260
261int virtio_serial_open(VirtIOSerialPort *port)
262{
263
264 if (port->host_connected) {
265 return 0;
266 }
267
268 port->host_connected = true;
269 send_control_event(port->vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 1);
270
271 return 0;
272}
273
274int virtio_serial_close(VirtIOSerialPort *port)
275{
276 port->host_connected = false;
277
278
279
280
281 port->throttled = false;
282 discard_throttle_data(port);
283 discard_vq_data(port->ovq, VIRTIO_DEVICE(port->vser));
284
285 send_control_event(port->vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 0);
286
287 return 0;
288}
289
290
291ssize_t virtio_serial_write(VirtIOSerialPort *port, const uint8_t *buf,
292 size_t size)
293{
294 if (!port || !port->host_connected || !port->guest_connected) {
295 return 0;
296 }
297 return write_to_port(port, buf, size);
298}
299
300
301
302
303
304size_t virtio_serial_guest_ready(VirtIOSerialPort *port)
305{
306 VirtIODevice *vdev = VIRTIO_DEVICE(port->vser);
307 VirtQueue *vq = port->ivq;
308 unsigned int bytes;
309
310 if (!virtio_queue_ready(vq) ||
311 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) ||
312 virtio_queue_empty(vq)) {
313 return 0;
314 }
315 if (use_multiport(port->vser) && !port->guest_connected) {
316 return 0;
317 }
318 virtqueue_get_avail_bytes(vq, &bytes, NULL, 4096, 0);
319 return bytes;
320}
321
322static void flush_queued_data_bh(void *opaque)
323{
324 VirtIOSerialPort *port = opaque;
325
326 flush_queued_data(port);
327}
328
329void virtio_serial_throttle_port(VirtIOSerialPort *port, bool throttle)
330{
331 if (!port) {
332 return;
333 }
334
335 trace_virtio_serial_throttle_port(port->id, throttle);
336 port->throttled = throttle;
337 if (throttle) {
338 return;
339 }
340 qemu_bh_schedule(port->bh);
341}
342
343
344static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len)
345{
346 VirtIODevice *vdev = VIRTIO_DEVICE(vser);
347 struct VirtIOSerialPort *port;
348 VirtIOSerialPortClass *vsc;
349 struct virtio_console_control cpkt, *gcpkt;
350 uint8_t *buffer;
351 size_t buffer_len;
352
353 gcpkt = buf;
354
355 if (len < sizeof(cpkt)) {
356
357 return;
358 }
359
360 cpkt.event = virtio_lduw_p(vdev, &gcpkt->event);
361 cpkt.value = virtio_lduw_p(vdev, &gcpkt->value);
362
363 trace_virtio_serial_handle_control_message(cpkt.event, cpkt.value);
364
365 if (cpkt.event == VIRTIO_CONSOLE_DEVICE_READY) {
366 if (!cpkt.value) {
367 error_report("virtio-serial-bus: Guest failure in adding device %s",
368 vser->bus.qbus.name);
369 return;
370 }
371
372
373
374
375 QTAILQ_FOREACH(port, &vser->ports, next) {
376 send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_ADD, 1);
377 }
378 return;
379 }
380
381 port = find_port_by_id(vser, virtio_ldl_p(vdev, &gcpkt->id));
382 if (!port) {
383 error_report("virtio-serial-bus: Unexpected port id %u for device %s",
384 virtio_ldl_p(vdev, &gcpkt->id), vser->bus.qbus.name);
385 return;
386 }
387
388 trace_virtio_serial_handle_control_message_port(port->id);
389
390 vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
391
392 switch(cpkt.event) {
393 case VIRTIO_CONSOLE_PORT_READY:
394 if (!cpkt.value) {
395 error_report("virtio-serial-bus: Guest failure in adding port %u for device %s",
396 port->id, vser->bus.qbus.name);
397 break;
398 }
399
400
401
402
403
404
405
406 if (vsc->is_console) {
407 send_control_event(vser, port->id, VIRTIO_CONSOLE_CONSOLE_PORT, 1);
408 }
409
410 if (port->name) {
411 virtio_stl_p(vdev, &cpkt.id, port->id);
412 virtio_stw_p(vdev, &cpkt.event, VIRTIO_CONSOLE_PORT_NAME);
413 virtio_stw_p(vdev, &cpkt.value, 1);
414
415 buffer_len = sizeof(cpkt) + strlen(port->name) + 1;
416 buffer = g_malloc(buffer_len);
417
418 memcpy(buffer, &cpkt, sizeof(cpkt));
419 memcpy(buffer + sizeof(cpkt), port->name, strlen(port->name));
420 buffer[buffer_len - 1] = 0;
421
422 send_control_msg(vser, buffer, buffer_len);
423 g_free(buffer);
424 }
425
426 if (port->host_connected) {
427 send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 1);
428 }
429
430
431
432
433
434
435
436 if (vsc->guest_ready) {
437 vsc->guest_ready(port);
438 }
439 break;
440
441 case VIRTIO_CONSOLE_PORT_OPEN:
442 port->guest_connected = cpkt.value;
443 if (vsc->set_guest_connected) {
444
445 vsc->set_guest_connected(port, cpkt.value);
446 }
447 break;
448 }
449}
450
451static void control_in(VirtIODevice *vdev, VirtQueue *vq)
452{
453}
454
455static void control_out(VirtIODevice *vdev, VirtQueue *vq)
456{
457 VirtQueueElement *elem;
458 VirtIOSerial *vser;
459 uint8_t *buf;
460 size_t len;
461
462 vser = VIRTIO_SERIAL(vdev);
463
464 len = 0;
465 buf = NULL;
466 for (;;) {
467 size_t cur_len;
468
469 elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
470 if (!elem) {
471 break;
472 }
473
474 cur_len = iov_size(elem->out_sg, elem->out_num);
475
476
477
478
479 if (cur_len > len) {
480 g_free(buf);
481
482 buf = g_malloc(cur_len);
483 len = cur_len;
484 }
485 iov_to_buf(elem->out_sg, elem->out_num, 0, buf, cur_len);
486
487 handle_control_message(vser, buf, cur_len);
488 virtqueue_push(vq, elem, 0);
489 g_free(elem);
490 }
491 g_free(buf);
492 virtio_notify(vdev, vq);
493}
494
495
496static void handle_output(VirtIODevice *vdev, VirtQueue *vq)
497{
498 VirtIOSerial *vser;
499 VirtIOSerialPort *port;
500
501 vser = VIRTIO_SERIAL(vdev);
502 port = find_port_by_vq(vser, vq);
503
504 if (!port || !port->host_connected) {
505 discard_vq_data(vq, vdev);
506 return;
507 }
508
509 if (!port->throttled) {
510 do_flush_queued_data(port, vq, vdev);
511 return;
512 }
513}
514
515static void handle_input(VirtIODevice *vdev, VirtQueue *vq)
516{
517
518
519
520
521
522
523
524
525
526
527
528 VirtIOSerial *vser;
529 VirtIOSerialPort *port;
530 VirtIOSerialPortClass *vsc;
531
532 vser = VIRTIO_SERIAL(vdev);
533 port = find_port_by_vq(vser, vq);
534
535 if (!port) {
536 return;
537 }
538 vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
539
540
541
542
543
544
545 if (port->guest_connected && port->host_connected && vsc->guest_writable) {
546 vsc->guest_writable(port);
547 }
548}
549
550static uint64_t get_features(VirtIODevice *vdev, uint64_t features,
551 Error **errp)
552{
553 VirtIOSerial *vser;
554
555 vser = VIRTIO_SERIAL(vdev);
556
557 features |= vser->host_features;
558 if (vser->bus.max_nr_ports > 1) {
559 virtio_add_feature(&features, VIRTIO_CONSOLE_F_MULTIPORT);
560 }
561 return features;
562}
563
564
565static void get_config(VirtIODevice *vdev, uint8_t *config_data)
566{
567 VirtIOSerial *vser = VIRTIO_SERIAL(vdev);
568 struct virtio_console_config *config =
569 (struct virtio_console_config *)config_data;
570
571 config->cols = 0;
572 config->rows = 0;
573 config->max_nr_ports = virtio_tswap32(vdev,
574 vser->serial.max_virtserial_ports);
575}
576
577
578static void set_config(VirtIODevice *vdev, const uint8_t *config_data)
579{
580 VirtIOSerial *vser = VIRTIO_SERIAL(vdev);
581 struct virtio_console_config *config =
582 (struct virtio_console_config *)config_data;
583 uint8_t emerg_wr_lo = le32_to_cpu(config->emerg_wr);
584 VirtIOSerialPort *port = find_first_connected_console(vser);
585 VirtIOSerialPortClass *vsc;
586
587 if (!config->emerg_wr) {
588 return;
589 }
590
591
592 config->emerg_wr = 0;
593 if (!port) {
594 return;
595 }
596 vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
597 (void)vsc->have_data(port, &emerg_wr_lo, 1);
598}
599
600static void guest_reset(VirtIOSerial *vser)
601{
602 VirtIOSerialPort *port;
603 VirtIOSerialPortClass *vsc;
604
605 QTAILQ_FOREACH(port, &vser->ports, next) {
606 vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
607
608 discard_throttle_data(port);
609
610 if (port->guest_connected) {
611 port->guest_connected = false;
612 if (vsc->set_guest_connected) {
613 vsc->set_guest_connected(port, false);
614 }
615 }
616 }
617}
618
619static void set_status(VirtIODevice *vdev, uint8_t status)
620{
621 VirtIOSerial *vser;
622 VirtIOSerialPort *port;
623
624 vser = VIRTIO_SERIAL(vdev);
625 port = find_port_by_id(vser, 0);
626
627 if (port && !use_multiport(port->vser)
628 && (status & VIRTIO_CONFIG_S_DRIVER_OK)) {
629
630
631
632
633
634
635 port->guest_connected = true;
636 }
637 if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
638 guest_reset(vser);
639 }
640}
641
642static void vser_reset(VirtIODevice *vdev)
643{
644 VirtIOSerial *vser;
645
646 vser = VIRTIO_SERIAL(vdev);
647 guest_reset(vser);
648}
649
650static void virtio_serial_save_device(VirtIODevice *vdev, QEMUFile *f)
651{
652 VirtIOSerial *s = VIRTIO_SERIAL(vdev);
653 VirtIOSerialPort *port;
654 uint32_t nr_active_ports;
655 unsigned int i, max_nr_ports;
656 struct virtio_console_config config;
657
658
659 get_config(vdev, (uint8_t *)&config);
660 qemu_put_be16s(f, &config.cols);
661 qemu_put_be16s(f, &config.rows);
662 qemu_put_be32s(f, &config.max_nr_ports);
663
664
665 max_nr_ports = s->serial.max_virtserial_ports;
666 for (i = 0; i < (max_nr_ports + 31) / 32; i++) {
667 qemu_put_be32s(f, &s->ports_map[i]);
668 }
669
670
671
672 nr_active_ports = 0;
673 QTAILQ_FOREACH(port, &s->ports, next) {
674 nr_active_ports++;
675 }
676
677 qemu_put_be32s(f, &nr_active_ports);
678
679
680
681
682 QTAILQ_FOREACH(port, &s->ports, next) {
683 uint32_t elem_popped;
684
685 qemu_put_be32s(f, &port->id);
686 qemu_put_byte(f, port->guest_connected);
687 qemu_put_byte(f, port->host_connected);
688
689 elem_popped = 0;
690 if (port->elem) {
691 elem_popped = 1;
692 }
693 qemu_put_be32s(f, &elem_popped);
694 if (elem_popped) {
695 qemu_put_be32s(f, &port->iov_idx);
696 qemu_put_be64s(f, &port->iov_offset);
697 qemu_put_virtqueue_element(f, port->elem);
698 }
699 }
700}
701
702static void virtio_serial_post_load_timer_cb(void *opaque)
703{
704 uint32_t i;
705 VirtIOSerial *s = VIRTIO_SERIAL(opaque);
706 VirtIOSerialPort *port;
707 uint8_t host_connected;
708 VirtIOSerialPortClass *vsc;
709
710 if (!s->post_load) {
711 return;
712 }
713 for (i = 0 ; i < s->post_load->nr_active_ports; ++i) {
714 port = s->post_load->connected[i].port;
715 host_connected = s->post_load->connected[i].host_connected;
716 if (host_connected != port->host_connected) {
717
718
719
720
721 send_control_event(s, port->id, VIRTIO_CONSOLE_PORT_OPEN,
722 port->host_connected);
723 }
724 vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
725 if (vsc->set_guest_connected) {
726 vsc->set_guest_connected(port, port->guest_connected);
727 }
728 }
729 g_free(s->post_load->connected);
730 timer_del(s->post_load->timer);
731 timer_free(s->post_load->timer);
732 g_free(s->post_load);
733 s->post_load = NULL;
734}
735
736static int fetch_active_ports_list(QEMUFile *f,
737 VirtIOSerial *s, uint32_t nr_active_ports)
738{
739 VirtIODevice *vdev = VIRTIO_DEVICE(s);
740 uint32_t i;
741
742 s->post_load = g_malloc0(sizeof(*s->post_load));
743 s->post_load->nr_active_ports = nr_active_ports;
744 s->post_load->connected =
745 g_malloc0(sizeof(*s->post_load->connected) * nr_active_ports);
746
747 s->post_load->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
748 virtio_serial_post_load_timer_cb,
749 s);
750
751
752 for (i = 0; i < nr_active_ports; i++) {
753 VirtIOSerialPort *port;
754 uint32_t elem_popped;
755 uint32_t id;
756
757 id = qemu_get_be32(f);
758 port = find_port_by_id(s, id);
759 if (!port) {
760 return -EINVAL;
761 }
762
763 port->guest_connected = qemu_get_byte(f);
764 s->post_load->connected[i].port = port;
765 s->post_load->connected[i].host_connected = qemu_get_byte(f);
766
767 qemu_get_be32s(f, &elem_popped);
768 if (elem_popped) {
769 qemu_get_be32s(f, &port->iov_idx);
770 qemu_get_be64s(f, &port->iov_offset);
771
772 port->elem =
773 qemu_get_virtqueue_element(vdev, f, sizeof(VirtQueueElement));
774
775
776
777
778
779 virtio_serial_throttle_port(port, false);
780 }
781 }
782 timer_mod(s->post_load->timer, 1);
783 return 0;
784}
785
786static int virtio_serial_load_device(VirtIODevice *vdev, QEMUFile *f,
787 int version_id)
788{
789 VirtIOSerial *s = VIRTIO_SERIAL(vdev);
790 uint32_t max_nr_ports, nr_active_ports, ports_map;
791 unsigned int i;
792 int ret;
793 uint32_t tmp;
794
795
796 qemu_get_be16s(f, (uint16_t *) &tmp);
797 qemu_get_be16s(f, (uint16_t *) &tmp);
798 qemu_get_be32s(f, &tmp);
799
800 max_nr_ports = s->serial.max_virtserial_ports;
801 for (i = 0; i < (max_nr_ports + 31) / 32; i++) {
802 qemu_get_be32s(f, &ports_map);
803
804 if (ports_map != s->ports_map[i]) {
805
806
807
808
809 return -EINVAL;
810 }
811 }
812
813 qemu_get_be32s(f, &nr_active_ports);
814
815 if (nr_active_ports) {
816 ret = fetch_active_ports_list(f, s, nr_active_ports);
817 if (ret) {
818 return ret;
819 }
820 }
821 return 0;
822}
823
824static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent);
825
826static Property virtser_props[] = {
827 DEFINE_PROP_UINT32("nr", VirtIOSerialPort, id, VIRTIO_CONSOLE_BAD_ID),
828 DEFINE_PROP_STRING("name", VirtIOSerialPort, name),
829 DEFINE_PROP_END_OF_LIST()
830};
831
832#define TYPE_VIRTIO_SERIAL_BUS "virtio-serial-bus"
833#define VIRTIO_SERIAL_BUS(obj) \
834 OBJECT_CHECK(VirtIOSerialBus, (obj), TYPE_VIRTIO_SERIAL_BUS)
835
836static void virtser_bus_class_init(ObjectClass *klass, void *data)
837{
838 BusClass *k = BUS_CLASS(klass);
839 k->print_dev = virtser_bus_dev_print;
840}
841
842static const TypeInfo virtser_bus_info = {
843 .name = TYPE_VIRTIO_SERIAL_BUS,
844 .parent = TYPE_BUS,
845 .instance_size = sizeof(VirtIOSerialBus),
846 .class_init = virtser_bus_class_init,
847};
848
849static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent)
850{
851 VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(qdev);
852
853 monitor_printf(mon, "%*sport %d, guest %s, host %s, throttle %s\n",
854 indent, "", port->id,
855 port->guest_connected ? "on" : "off",
856 port->host_connected ? "on" : "off",
857 port->throttled ? "on" : "off");
858}
859
860
861static uint32_t find_free_port_id(VirtIOSerial *vser)
862{
863 unsigned int i, max_nr_ports;
864
865 max_nr_ports = vser->serial.max_virtserial_ports;
866 for (i = 0; i < (max_nr_ports + 31) / 32; i++) {
867 uint32_t map, zeroes;
868
869 map = vser->ports_map[i];
870 zeroes = ctz32(~map);
871 if (zeroes != 32) {
872 return zeroes + i * 32;
873 }
874 }
875 return VIRTIO_CONSOLE_BAD_ID;
876}
877
878static void mark_port_added(VirtIOSerial *vser, uint32_t port_id)
879{
880 unsigned int i;
881
882 i = port_id / 32;
883 vser->ports_map[i] |= 1U << (port_id % 32);
884}
885
886static void add_port(VirtIOSerial *vser, uint32_t port_id)
887{
888 mark_port_added(vser, port_id);
889 send_control_event(vser, port_id, VIRTIO_CONSOLE_PORT_ADD, 1);
890}
891
892static void remove_port(VirtIOSerial *vser, uint32_t port_id)
893{
894 VirtIOSerialPort *port;
895
896
897
898
899
900
901 if (port_id) {
902 unsigned int i;
903
904 i = port_id / 32;
905 vser->ports_map[i] &= ~(1U << (port_id % 32));
906 }
907
908 port = find_port_by_id(vser, port_id);
909
910
911
912
913 assert(port);
914
915
916 discard_throttle_data(port);
917 discard_vq_data(port->ovq, VIRTIO_DEVICE(port->vser));
918
919 send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_REMOVE, 1);
920}
921
922static void virtser_port_device_realize(DeviceState *dev, Error **errp)
923{
924 VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(dev);
925 VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
926 VirtIOSerialBus *bus = VIRTIO_SERIAL_BUS(qdev_get_parent_bus(dev));
927 int max_nr_ports;
928 bool plugging_port0;
929 Error *err = NULL;
930
931 port->vser = bus->vser;
932 port->bh = qemu_bh_new(flush_queued_data_bh, port);
933
934 assert(vsc->have_data);
935
936
937
938
939
940
941 plugging_port0 = vsc->is_console && !find_port_by_id(port->vser, 0);
942
943 if (find_port_by_id(port->vser, port->id)) {
944 error_setg(errp, "virtio-serial-bus: A port already exists at id %u",
945 port->id);
946 return;
947 }
948
949 if (port->name != NULL && find_port_by_name(port->name)) {
950 error_setg(errp, "virtio-serial-bus: A port already exists by name %s",
951 port->name);
952 return;
953 }
954
955 if (port->id == VIRTIO_CONSOLE_BAD_ID) {
956 if (plugging_port0) {
957 port->id = 0;
958 } else {
959 port->id = find_free_port_id(port->vser);
960 if (port->id == VIRTIO_CONSOLE_BAD_ID) {
961 error_setg(errp, "virtio-serial-bus: Maximum port limit for "
962 "this device reached");
963 return;
964 }
965 }
966 }
967
968 max_nr_ports = port->vser->serial.max_virtserial_ports;
969 if (port->id >= max_nr_ports) {
970 error_setg(errp, "virtio-serial-bus: Out-of-range port id specified, "
971 "max. allowed: %u", max_nr_ports - 1);
972 return;
973 }
974
975 vsc->realize(dev, &err);
976 if (err != NULL) {
977 error_propagate(errp, err);
978 return;
979 }
980
981 port->elem = NULL;
982}
983
984static void virtser_port_device_plug(HotplugHandler *hotplug_dev,
985 DeviceState *dev, Error **errp)
986{
987 VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(dev);
988
989 QTAILQ_INSERT_TAIL(&port->vser->ports, port, next);
990 port->ivq = port->vser->ivqs[port->id];
991 port->ovq = port->vser->ovqs[port->id];
992
993 add_port(port->vser, port->id);
994
995
996 virtio_notify_config(VIRTIO_DEVICE(hotplug_dev));
997}
998
999static void virtser_port_device_unrealize(DeviceState *dev, Error **errp)
1000{
1001 VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(dev);
1002 VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(dev);
1003 VirtIOSerial *vser = port->vser;
1004
1005 qemu_bh_delete(port->bh);
1006 remove_port(port->vser, port->id);
1007
1008 QTAILQ_REMOVE(&vser->ports, port, next);
1009
1010 if (vsc->unrealize) {
1011 vsc->unrealize(dev, errp);
1012 }
1013}
1014
1015static void virtio_serial_device_realize(DeviceState *dev, Error **errp)
1016{
1017 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1018 VirtIOSerial *vser = VIRTIO_SERIAL(dev);
1019 uint32_t i, max_supported_ports;
1020 size_t config_size = sizeof(struct virtio_console_config);
1021
1022 if (!vser->serial.max_virtserial_ports) {
1023 error_setg(errp, "Maximum number of serial ports not specified");
1024 return;
1025 }
1026
1027
1028 max_supported_ports = VIRTIO_QUEUE_MAX / 2 - 1;
1029
1030 if (vser->serial.max_virtserial_ports > max_supported_ports) {
1031 error_setg(errp, "maximum ports supported: %u", max_supported_ports);
1032 return;
1033 }
1034
1035 if (!virtio_has_feature(vser->host_features,
1036 VIRTIO_CONSOLE_F_EMERG_WRITE)) {
1037 config_size = offsetof(struct virtio_console_config, emerg_wr);
1038 }
1039 virtio_init(vdev, "virtio-serial", VIRTIO_ID_CONSOLE,
1040 config_size);
1041
1042
1043 qbus_create_inplace(&vser->bus, sizeof(vser->bus), TYPE_VIRTIO_SERIAL_BUS,
1044 dev, vdev->bus_name);
1045 qbus_set_hotplug_handler(BUS(&vser->bus), DEVICE(vser), errp);
1046 vser->bus.vser = vser;
1047 QTAILQ_INIT(&vser->ports);
1048
1049 vser->bus.max_nr_ports = vser->serial.max_virtserial_ports;
1050 vser->ivqs = g_malloc(vser->serial.max_virtserial_ports
1051 * sizeof(VirtQueue *));
1052 vser->ovqs = g_malloc(vser->serial.max_virtserial_ports
1053 * sizeof(VirtQueue *));
1054
1055
1056 vser->ivqs[0] = virtio_add_queue(vdev, 128, handle_input);
1057
1058 vser->ovqs[0] = virtio_add_queue(vdev, 128, handle_output);
1059
1060
1061
1062
1063
1064
1065
1066
1067 vser->c_ivq = virtio_add_queue(vdev, 32, control_in);
1068
1069 vser->c_ovq = virtio_add_queue(vdev, 32, control_out);
1070
1071 for (i = 1; i < vser->bus.max_nr_ports; i++) {
1072
1073 vser->ivqs[i] = virtio_add_queue(vdev, 128, handle_input);
1074
1075 vser->ovqs[i] = virtio_add_queue(vdev, 128, handle_output);
1076 }
1077
1078 vser->ports_map = g_malloc0(((vser->serial.max_virtserial_ports + 31) / 32)
1079 * sizeof(vser->ports_map[0]));
1080
1081
1082
1083
1084 mark_port_added(vser, 0);
1085
1086 vser->post_load = NULL;
1087
1088 QLIST_INSERT_HEAD(&vserdevices.devices, vser, next);
1089}
1090
1091static void virtio_serial_port_class_init(ObjectClass *klass, void *data)
1092{
1093 DeviceClass *k = DEVICE_CLASS(klass);
1094
1095 set_bit(DEVICE_CATEGORY_INPUT, k->categories);
1096 k->bus_type = TYPE_VIRTIO_SERIAL_BUS;
1097 k->realize = virtser_port_device_realize;
1098 k->unrealize = virtser_port_device_unrealize;
1099 k->props = virtser_props;
1100}
1101
1102static const TypeInfo virtio_serial_port_type_info = {
1103 .name = TYPE_VIRTIO_SERIAL_PORT,
1104 .parent = TYPE_DEVICE,
1105 .instance_size = sizeof(VirtIOSerialPort),
1106 .abstract = true,
1107 .class_size = sizeof(VirtIOSerialPortClass),
1108 .class_init = virtio_serial_port_class_init,
1109};
1110
1111static void virtio_serial_device_unrealize(DeviceState *dev, Error **errp)
1112{
1113 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1114 VirtIOSerial *vser = VIRTIO_SERIAL(dev);
1115
1116 QLIST_REMOVE(vser, next);
1117
1118 g_free(vser->ivqs);
1119 g_free(vser->ovqs);
1120 g_free(vser->ports_map);
1121 if (vser->post_load) {
1122 g_free(vser->post_load->connected);
1123 timer_del(vser->post_load->timer);
1124 timer_free(vser->post_load->timer);
1125 g_free(vser->post_load);
1126 }
1127
1128 qbus_set_hotplug_handler(BUS(&vser->bus), NULL, errp);
1129
1130 virtio_cleanup(vdev);
1131}
1132
1133
1134static const VMStateDescription vmstate_virtio_console = {
1135 .name = "virtio-console",
1136 .minimum_version_id = 3,
1137 .version_id = 3,
1138 .fields = (VMStateField[]) {
1139 VMSTATE_VIRTIO_DEVICE,
1140 VMSTATE_END_OF_LIST()
1141 },
1142};
1143
1144static Property virtio_serial_properties[] = {
1145 DEFINE_PROP_UINT32("max_ports", VirtIOSerial, serial.max_virtserial_ports,
1146 31),
1147 DEFINE_PROP_BIT64("emergency-write", VirtIOSerial, host_features,
1148 VIRTIO_CONSOLE_F_EMERG_WRITE, true),
1149 DEFINE_PROP_END_OF_LIST(),
1150};
1151
1152static void virtio_serial_class_init(ObjectClass *klass, void *data)
1153{
1154 DeviceClass *dc = DEVICE_CLASS(klass);
1155 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
1156 HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
1157
1158 QLIST_INIT(&vserdevices.devices);
1159
1160 dc->props = virtio_serial_properties;
1161 dc->vmsd = &vmstate_virtio_console;
1162 set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
1163 vdc->realize = virtio_serial_device_realize;
1164 vdc->unrealize = virtio_serial_device_unrealize;
1165 vdc->get_features = get_features;
1166 vdc->get_config = get_config;
1167 vdc->set_config = set_config;
1168 vdc->set_status = set_status;
1169 vdc->reset = vser_reset;
1170 vdc->save = virtio_serial_save_device;
1171 vdc->load = virtio_serial_load_device;
1172 hc->plug = virtser_port_device_plug;
1173 hc->unplug = qdev_simple_device_unplug_cb;
1174}
1175
1176static const TypeInfo virtio_device_info = {
1177 .name = TYPE_VIRTIO_SERIAL,
1178 .parent = TYPE_VIRTIO_DEVICE,
1179 .instance_size = sizeof(VirtIOSerial),
1180 .class_init = virtio_serial_class_init,
1181 .interfaces = (InterfaceInfo[]) {
1182 { TYPE_HOTPLUG_HANDLER },
1183 { }
1184 }
1185};
1186
1187static void virtio_serial_register_types(void)
1188{
1189 type_register_static(&virtser_bus_info);
1190 type_register_static(&virtio_serial_port_type_info);
1191 type_register_static(&virtio_device_info);
1192}
1193
1194type_init(virtio_serial_register_types)
1195