root / hw / virtio-serial-bus.c @ 0d09e41a
History | View | Annotate | Download (27.8 kB)
1 |
/*
|
---|---|
2 |
* A bus for connecting virtio serial and console ports
|
3 |
*
|
4 |
* Copyright (C) 2009, 2010 Red Hat, Inc.
|
5 |
*
|
6 |
* Author(s):
|
7 |
* Amit Shah <amit.shah@redhat.com>
|
8 |
*
|
9 |
* Some earlier parts are:
|
10 |
* Copyright IBM, Corp. 2008
|
11 |
* authored by
|
12 |
* Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
|
13 |
*
|
14 |
* This work is licensed under the terms of the GNU GPL, version 2. See
|
15 |
* the COPYING file in the top-level directory.
|
16 |
*
|
17 |
* Contributions after 2012-01-13 are licensed under the terms of the
|
18 |
* GNU GPL, version 2 or (at your option) any later version.
|
19 |
*/
|
20 |
|
21 |
#include "qemu/iov.h" |
22 |
#include "monitor/monitor.h" |
23 |
#include "qemu/queue.h" |
24 |
#include "hw/sysbus.h" |
25 |
#include "trace.h" |
26 |
#include "hw/virtio/virtio-serial.h" |
27 |
|
28 |
static VirtIOSerialPort *find_port_by_id(VirtIOSerial *vser, uint32_t id)
|
29 |
{ |
30 |
VirtIOSerialPort *port; |
31 |
|
32 |
if (id == VIRTIO_CONSOLE_BAD_ID) {
|
33 |
return NULL; |
34 |
} |
35 |
|
36 |
QTAILQ_FOREACH(port, &vser->ports, next) { |
37 |
if (port->id == id)
|
38 |
return port;
|
39 |
} |
40 |
return NULL; |
41 |
} |
42 |
|
43 |
static VirtIOSerialPort *find_port_by_vq(VirtIOSerial *vser, VirtQueue *vq)
|
44 |
{ |
45 |
VirtIOSerialPort *port; |
46 |
|
47 |
QTAILQ_FOREACH(port, &vser->ports, next) { |
48 |
if (port->ivq == vq || port->ovq == vq)
|
49 |
return port;
|
50 |
} |
51 |
return NULL; |
52 |
} |
53 |
|
54 |
static bool use_multiport(VirtIOSerial *vser) |
55 |
{ |
56 |
return vser->vdev.guest_features & (1 << VIRTIO_CONSOLE_F_MULTIPORT); |
57 |
} |
58 |
|
59 |
static size_t write_to_port(VirtIOSerialPort *port,
|
60 |
const uint8_t *buf, size_t size)
|
61 |
{ |
62 |
VirtQueueElement elem; |
63 |
VirtQueue *vq; |
64 |
size_t offset; |
65 |
|
66 |
vq = port->ivq; |
67 |
if (!virtio_queue_ready(vq)) {
|
68 |
return 0; |
69 |
} |
70 |
|
71 |
offset = 0;
|
72 |
while (offset < size) {
|
73 |
size_t len; |
74 |
|
75 |
if (!virtqueue_pop(vq, &elem)) {
|
76 |
break;
|
77 |
} |
78 |
|
79 |
len = iov_from_buf(elem.in_sg, elem.in_num, 0,
|
80 |
buf + offset, size - offset); |
81 |
offset += len; |
82 |
|
83 |
virtqueue_push(vq, &elem, len); |
84 |
} |
85 |
|
86 |
virtio_notify(&port->vser->vdev, vq); |
87 |
return offset;
|
88 |
} |
89 |
|
90 |
static void discard_vq_data(VirtQueue *vq, VirtIODevice *vdev) |
91 |
{ |
92 |
VirtQueueElement elem; |
93 |
|
94 |
if (!virtio_queue_ready(vq)) {
|
95 |
return;
|
96 |
} |
97 |
while (virtqueue_pop(vq, &elem)) {
|
98 |
virtqueue_push(vq, &elem, 0);
|
99 |
} |
100 |
virtio_notify(vdev, vq); |
101 |
} |
102 |
|
103 |
static void do_flush_queued_data(VirtIOSerialPort *port, VirtQueue *vq, |
104 |
VirtIODevice *vdev) |
105 |
{ |
106 |
VirtIOSerialPortClass *vsc; |
107 |
|
108 |
assert(port); |
109 |
assert(virtio_queue_ready(vq)); |
110 |
|
111 |
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
112 |
|
113 |
while (!port->throttled) {
|
114 |
unsigned int i; |
115 |
|
116 |
/* Pop an elem only if we haven't left off a previous one mid-way */
|
117 |
if (!port->elem.out_num) {
|
118 |
if (!virtqueue_pop(vq, &port->elem)) {
|
119 |
break;
|
120 |
} |
121 |
port->iov_idx = 0;
|
122 |
port->iov_offset = 0;
|
123 |
} |
124 |
|
125 |
for (i = port->iov_idx; i < port->elem.out_num; i++) {
|
126 |
size_t buf_size; |
127 |
ssize_t ret; |
128 |
|
129 |
buf_size = port->elem.out_sg[i].iov_len - port->iov_offset; |
130 |
ret = vsc->have_data(port, |
131 |
port->elem.out_sg[i].iov_base |
132 |
+ port->iov_offset, |
133 |
buf_size); |
134 |
if (port->throttled) {
|
135 |
port->iov_idx = i; |
136 |
if (ret > 0) { |
137 |
port->iov_offset += ret; |
138 |
} |
139 |
break;
|
140 |
} |
141 |
port->iov_offset = 0;
|
142 |
} |
143 |
if (port->throttled) {
|
144 |
break;
|
145 |
} |
146 |
virtqueue_push(vq, &port->elem, 0);
|
147 |
port->elem.out_num = 0;
|
148 |
} |
149 |
virtio_notify(vdev, vq); |
150 |
} |
151 |
|
152 |
static void flush_queued_data(VirtIOSerialPort *port) |
153 |
{ |
154 |
assert(port); |
155 |
|
156 |
if (!virtio_queue_ready(port->ovq)) {
|
157 |
return;
|
158 |
} |
159 |
do_flush_queued_data(port, port->ovq, &port->vser->vdev); |
160 |
} |
161 |
|
162 |
static size_t send_control_msg(VirtIOSerial *vser, void *buf, size_t len) |
163 |
{ |
164 |
VirtQueueElement elem; |
165 |
VirtQueue *vq; |
166 |
|
167 |
vq = vser->c_ivq; |
168 |
if (!virtio_queue_ready(vq)) {
|
169 |
return 0; |
170 |
} |
171 |
if (!virtqueue_pop(vq, &elem)) {
|
172 |
return 0; |
173 |
} |
174 |
|
175 |
memcpy(elem.in_sg[0].iov_base, buf, len);
|
176 |
|
177 |
virtqueue_push(vq, &elem, len); |
178 |
virtio_notify(&vser->vdev, vq); |
179 |
return len;
|
180 |
} |
181 |
|
182 |
static size_t send_control_event(VirtIOSerial *vser, uint32_t port_id,
|
183 |
uint16_t event, uint16_t value) |
184 |
{ |
185 |
struct virtio_console_control cpkt;
|
186 |
|
187 |
stl_p(&cpkt.id, port_id); |
188 |
stw_p(&cpkt.event, event); |
189 |
stw_p(&cpkt.value, value); |
190 |
|
191 |
trace_virtio_serial_send_control_event(port_id, event, value); |
192 |
return send_control_msg(vser, &cpkt, sizeof(cpkt)); |
193 |
} |
194 |
|
195 |
/* Functions for use inside qemu to open and read from/write to ports */
|
196 |
int virtio_serial_open(VirtIOSerialPort *port)
|
197 |
{ |
198 |
/* Don't allow opening an already-open port */
|
199 |
if (port->host_connected) {
|
200 |
return 0; |
201 |
} |
202 |
/* Send port open notification to the guest */
|
203 |
port->host_connected = true;
|
204 |
send_control_event(port->vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 1);
|
205 |
|
206 |
return 0; |
207 |
} |
208 |
|
209 |
int virtio_serial_close(VirtIOSerialPort *port)
|
210 |
{ |
211 |
port->host_connected = false;
|
212 |
/*
|
213 |
* If there's any data the guest sent which the app didn't
|
214 |
* consume, reset the throttling flag and discard the data.
|
215 |
*/
|
216 |
port->throttled = false;
|
217 |
discard_vq_data(port->ovq, &port->vser->vdev); |
218 |
|
219 |
send_control_event(port->vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 0);
|
220 |
|
221 |
return 0; |
222 |
} |
223 |
|
224 |
/* Individual ports/apps call this function to write to the guest. */
|
225 |
ssize_t virtio_serial_write(VirtIOSerialPort *port, const uint8_t *buf,
|
226 |
size_t size) |
227 |
{ |
228 |
if (!port || !port->host_connected || !port->guest_connected) {
|
229 |
return 0; |
230 |
} |
231 |
return write_to_port(port, buf, size);
|
232 |
} |
233 |
|
234 |
/*
|
235 |
* Readiness of the guest to accept data on a port.
|
236 |
* Returns max. data the guest can receive
|
237 |
*/
|
238 |
size_t virtio_serial_guest_ready(VirtIOSerialPort *port) |
239 |
{ |
240 |
VirtQueue *vq = port->ivq; |
241 |
unsigned int bytes; |
242 |
|
243 |
if (!virtio_queue_ready(vq) ||
|
244 |
!(port->vser->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK) || |
245 |
virtio_queue_empty(vq)) { |
246 |
return 0; |
247 |
} |
248 |
if (use_multiport(port->vser) && !port->guest_connected) {
|
249 |
return 0; |
250 |
} |
251 |
virtqueue_get_avail_bytes(vq, &bytes, NULL, 4096, 0); |
252 |
return bytes;
|
253 |
} |
254 |
|
255 |
static void flush_queued_data_bh(void *opaque) |
256 |
{ |
257 |
VirtIOSerialPort *port = opaque; |
258 |
|
259 |
flush_queued_data(port); |
260 |
} |
261 |
|
262 |
void virtio_serial_throttle_port(VirtIOSerialPort *port, bool throttle) |
263 |
{ |
264 |
if (!port) {
|
265 |
return;
|
266 |
} |
267 |
|
268 |
trace_virtio_serial_throttle_port(port->id, throttle); |
269 |
port->throttled = throttle; |
270 |
if (throttle) {
|
271 |
return;
|
272 |
} |
273 |
qemu_bh_schedule(port->bh); |
274 |
} |
275 |
|
276 |
/* Guest wants to notify us of some event */
|
277 |
static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len) |
278 |
{ |
279 |
struct VirtIOSerialPort *port;
|
280 |
VirtIOSerialPortClass *vsc; |
281 |
struct virtio_console_control cpkt, *gcpkt;
|
282 |
uint8_t *buffer; |
283 |
size_t buffer_len; |
284 |
|
285 |
gcpkt = buf; |
286 |
|
287 |
if (len < sizeof(cpkt)) { |
288 |
/* The guest sent an invalid control packet */
|
289 |
return;
|
290 |
} |
291 |
|
292 |
cpkt.event = lduw_p(&gcpkt->event); |
293 |
cpkt.value = lduw_p(&gcpkt->value); |
294 |
|
295 |
trace_virtio_serial_handle_control_message(cpkt.event, cpkt.value); |
296 |
|
297 |
if (cpkt.event == VIRTIO_CONSOLE_DEVICE_READY) {
|
298 |
if (!cpkt.value) {
|
299 |
error_report("virtio-serial-bus: Guest failure in adding device %s",
|
300 |
vser->bus.qbus.name); |
301 |
return;
|
302 |
} |
303 |
/*
|
304 |
* The device is up, we can now tell the device about all the
|
305 |
* ports we have here.
|
306 |
*/
|
307 |
QTAILQ_FOREACH(port, &vser->ports, next) { |
308 |
send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_ADD, 1);
|
309 |
} |
310 |
return;
|
311 |
} |
312 |
|
313 |
port = find_port_by_id(vser, ldl_p(&gcpkt->id)); |
314 |
if (!port) {
|
315 |
error_report("virtio-serial-bus: Unexpected port id %u for device %s",
|
316 |
ldl_p(&gcpkt->id), vser->bus.qbus.name); |
317 |
return;
|
318 |
} |
319 |
|
320 |
trace_virtio_serial_handle_control_message_port(port->id); |
321 |
|
322 |
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
323 |
|
324 |
switch(cpkt.event) {
|
325 |
case VIRTIO_CONSOLE_PORT_READY:
|
326 |
if (!cpkt.value) {
|
327 |
error_report("virtio-serial-bus: Guest failure in adding port %u for device %s",
|
328 |
port->id, vser->bus.qbus.name); |
329 |
break;
|
330 |
} |
331 |
/*
|
332 |
* Now that we know the guest asked for the port name, we're
|
333 |
* sure the guest has initialised whatever state is necessary
|
334 |
* for this port. Now's a good time to let the guest know if
|
335 |
* this port is a console port so that the guest can hook it
|
336 |
* up to hvc.
|
337 |
*/
|
338 |
if (vsc->is_console) {
|
339 |
send_control_event(vser, port->id, VIRTIO_CONSOLE_CONSOLE_PORT, 1);
|
340 |
} |
341 |
|
342 |
if (port->name) {
|
343 |
stl_p(&cpkt.id, port->id); |
344 |
stw_p(&cpkt.event, VIRTIO_CONSOLE_PORT_NAME); |
345 |
stw_p(&cpkt.value, 1);
|
346 |
|
347 |
buffer_len = sizeof(cpkt) + strlen(port->name) + 1; |
348 |
buffer = g_malloc(buffer_len); |
349 |
|
350 |
memcpy(buffer, &cpkt, sizeof(cpkt));
|
351 |
memcpy(buffer + sizeof(cpkt), port->name, strlen(port->name));
|
352 |
buffer[buffer_len - 1] = 0; |
353 |
|
354 |
send_control_msg(vser, buffer, buffer_len); |
355 |
g_free(buffer); |
356 |
} |
357 |
|
358 |
if (port->host_connected) {
|
359 |
send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 1);
|
360 |
} |
361 |
|
362 |
/*
|
363 |
* When the guest has asked us for this information it means
|
364 |
* the guest is all setup and has its virtqueues
|
365 |
* initialised. If some app is interested in knowing about
|
366 |
* this event, let it know.
|
367 |
*/
|
368 |
if (vsc->guest_ready) {
|
369 |
vsc->guest_ready(port); |
370 |
} |
371 |
break;
|
372 |
|
373 |
case VIRTIO_CONSOLE_PORT_OPEN:
|
374 |
port->guest_connected = cpkt.value; |
375 |
if (vsc->set_guest_connected) {
|
376 |
/* Send the guest opened notification if an app is interested */
|
377 |
vsc->set_guest_connected(port, cpkt.value); |
378 |
} |
379 |
break;
|
380 |
} |
381 |
} |
382 |
|
383 |
static void control_in(VirtIODevice *vdev, VirtQueue *vq) |
384 |
{ |
385 |
} |
386 |
|
387 |
static void control_out(VirtIODevice *vdev, VirtQueue *vq) |
388 |
{ |
389 |
VirtQueueElement elem; |
390 |
VirtIOSerial *vser; |
391 |
uint8_t *buf; |
392 |
size_t len; |
393 |
|
394 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
395 |
|
396 |
len = 0;
|
397 |
buf = NULL;
|
398 |
while (virtqueue_pop(vq, &elem)) {
|
399 |
size_t cur_len; |
400 |
|
401 |
cur_len = iov_size(elem.out_sg, elem.out_num); |
402 |
/*
|
403 |
* Allocate a new buf only if we didn't have one previously or
|
404 |
* if the size of the buf differs
|
405 |
*/
|
406 |
if (cur_len > len) {
|
407 |
g_free(buf); |
408 |
|
409 |
buf = g_malloc(cur_len); |
410 |
len = cur_len; |
411 |
} |
412 |
iov_to_buf(elem.out_sg, elem.out_num, 0, buf, cur_len);
|
413 |
|
414 |
handle_control_message(vser, buf, cur_len); |
415 |
virtqueue_push(vq, &elem, 0);
|
416 |
} |
417 |
g_free(buf); |
418 |
virtio_notify(vdev, vq); |
419 |
} |
420 |
|
421 |
/* Guest wrote something to some port. */
|
422 |
static void handle_output(VirtIODevice *vdev, VirtQueue *vq) |
423 |
{ |
424 |
VirtIOSerial *vser; |
425 |
VirtIOSerialPort *port; |
426 |
|
427 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
428 |
port = find_port_by_vq(vser, vq); |
429 |
|
430 |
if (!port || !port->host_connected) {
|
431 |
discard_vq_data(vq, vdev); |
432 |
return;
|
433 |
} |
434 |
|
435 |
if (!port->throttled) {
|
436 |
do_flush_queued_data(port, vq, vdev); |
437 |
return;
|
438 |
} |
439 |
} |
440 |
|
441 |
static void handle_input(VirtIODevice *vdev, VirtQueue *vq) |
442 |
{ |
443 |
} |
444 |
|
445 |
static uint32_t get_features(VirtIODevice *vdev, uint32_t features)
|
446 |
{ |
447 |
VirtIOSerial *vser; |
448 |
|
449 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
450 |
|
451 |
if (vser->bus.max_nr_ports > 1) { |
452 |
features |= (1 << VIRTIO_CONSOLE_F_MULTIPORT);
|
453 |
} |
454 |
return features;
|
455 |
} |
456 |
|
457 |
/* Guest requested config info */
|
458 |
static void get_config(VirtIODevice *vdev, uint8_t *config_data) |
459 |
{ |
460 |
VirtIOSerial *vser; |
461 |
|
462 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
463 |
memcpy(config_data, &vser->config, sizeof(struct virtio_console_config)); |
464 |
} |
465 |
|
466 |
static void set_config(VirtIODevice *vdev, const uint8_t *config_data) |
467 |
{ |
468 |
struct virtio_console_config config;
|
469 |
|
470 |
memcpy(&config, config_data, sizeof(config));
|
471 |
} |
472 |
|
473 |
static void guest_reset(VirtIOSerial *vser) |
474 |
{ |
475 |
VirtIOSerialPort *port; |
476 |
VirtIOSerialPortClass *vsc; |
477 |
|
478 |
QTAILQ_FOREACH(port, &vser->ports, next) { |
479 |
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
480 |
if (port->guest_connected) {
|
481 |
port->guest_connected = false;
|
482 |
if (vsc->set_guest_connected) {
|
483 |
vsc->set_guest_connected(port, false);
|
484 |
} |
485 |
} |
486 |
} |
487 |
} |
488 |
|
489 |
static void set_status(VirtIODevice *vdev, uint8_t status) |
490 |
{ |
491 |
VirtIOSerial *vser; |
492 |
VirtIOSerialPort *port; |
493 |
|
494 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
495 |
port = find_port_by_id(vser, 0);
|
496 |
|
497 |
if (port && !use_multiport(port->vser)
|
498 |
&& (status & VIRTIO_CONFIG_S_DRIVER_OK)) { |
499 |
/*
|
500 |
* Non-multiport guests won't be able to tell us guest
|
501 |
* open/close status. Such guests can only have a port at id
|
502 |
* 0, so set guest_connected for such ports as soon as guest
|
503 |
* is up.
|
504 |
*/
|
505 |
port->guest_connected = true;
|
506 |
} |
507 |
if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
508 |
guest_reset(vser); |
509 |
} |
510 |
} |
511 |
|
512 |
static void vser_reset(VirtIODevice *vdev) |
513 |
{ |
514 |
VirtIOSerial *vser; |
515 |
|
516 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
517 |
guest_reset(vser); |
518 |
} |
519 |
|
520 |
static void virtio_serial_save(QEMUFile *f, void *opaque) |
521 |
{ |
522 |
VirtIOSerial *s = opaque; |
523 |
VirtIOSerialPort *port; |
524 |
uint32_t nr_active_ports; |
525 |
unsigned int i, max_nr_ports; |
526 |
|
527 |
/* The virtio device */
|
528 |
virtio_save(&s->vdev, f); |
529 |
|
530 |
/* The config space */
|
531 |
qemu_put_be16s(f, &s->config.cols); |
532 |
qemu_put_be16s(f, &s->config.rows); |
533 |
|
534 |
qemu_put_be32s(f, &s->config.max_nr_ports); |
535 |
|
536 |
/* The ports map */
|
537 |
max_nr_ports = tswap32(s->config.max_nr_ports); |
538 |
for (i = 0; i < (max_nr_ports + 31) / 32; i++) { |
539 |
qemu_put_be32s(f, &s->ports_map[i]); |
540 |
} |
541 |
|
542 |
/* Ports */
|
543 |
|
544 |
nr_active_ports = 0;
|
545 |
QTAILQ_FOREACH(port, &s->ports, next) { |
546 |
nr_active_ports++; |
547 |
} |
548 |
|
549 |
qemu_put_be32s(f, &nr_active_ports); |
550 |
|
551 |
/*
|
552 |
* Items in struct VirtIOSerialPort.
|
553 |
*/
|
554 |
QTAILQ_FOREACH(port, &s->ports, next) { |
555 |
uint32_t elem_popped; |
556 |
|
557 |
qemu_put_be32s(f, &port->id); |
558 |
qemu_put_byte(f, port->guest_connected); |
559 |
qemu_put_byte(f, port->host_connected); |
560 |
|
561 |
elem_popped = 0;
|
562 |
if (port->elem.out_num) {
|
563 |
elem_popped = 1;
|
564 |
} |
565 |
qemu_put_be32s(f, &elem_popped); |
566 |
if (elem_popped) {
|
567 |
qemu_put_be32s(f, &port->iov_idx); |
568 |
qemu_put_be64s(f, &port->iov_offset); |
569 |
|
570 |
qemu_put_buffer(f, (unsigned char *)&port->elem, |
571 |
sizeof(port->elem));
|
572 |
} |
573 |
} |
574 |
} |
575 |
|
576 |
static void virtio_serial_post_load_timer_cb(void *opaque) |
577 |
{ |
578 |
uint32_t i; |
579 |
VirtIOSerial *s = opaque; |
580 |
VirtIOSerialPort *port; |
581 |
uint8_t host_connected; |
582 |
VirtIOSerialPortClass *vsc; |
583 |
|
584 |
if (!s->post_load) {
|
585 |
return;
|
586 |
} |
587 |
for (i = 0 ; i < s->post_load->nr_active_ports; ++i) { |
588 |
port = s->post_load->connected[i].port; |
589 |
host_connected = s->post_load->connected[i].host_connected; |
590 |
if (host_connected != port->host_connected) {
|
591 |
/*
|
592 |
* We have to let the guest know of the host connection
|
593 |
* status change
|
594 |
*/
|
595 |
send_control_event(s, port->id, VIRTIO_CONSOLE_PORT_OPEN, |
596 |
port->host_connected); |
597 |
} |
598 |
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
599 |
if (vsc->set_guest_connected) {
|
600 |
vsc->set_guest_connected(port, port->guest_connected); |
601 |
} |
602 |
} |
603 |
g_free(s->post_load->connected); |
604 |
qemu_free_timer(s->post_load->timer); |
605 |
g_free(s->post_load); |
606 |
s->post_load = NULL;
|
607 |
} |
608 |
|
609 |
static int fetch_active_ports_list(QEMUFile *f, int version_id, |
610 |
VirtIOSerial *s, uint32_t nr_active_ports) |
611 |
{ |
612 |
uint32_t i; |
613 |
|
614 |
s->post_load = g_malloc0(sizeof(*s->post_load));
|
615 |
s->post_load->nr_active_ports = nr_active_ports; |
616 |
s->post_load->connected = |
617 |
g_malloc0(sizeof(*s->post_load->connected) * nr_active_ports);
|
618 |
|
619 |
s->post_load->timer = qemu_new_timer_ns(vm_clock, |
620 |
virtio_serial_post_load_timer_cb, |
621 |
s); |
622 |
|
623 |
/* Items in struct VirtIOSerialPort */
|
624 |
for (i = 0; i < nr_active_ports; i++) { |
625 |
VirtIOSerialPort *port; |
626 |
uint32_t id; |
627 |
|
628 |
id = qemu_get_be32(f); |
629 |
port = find_port_by_id(s, id); |
630 |
if (!port) {
|
631 |
return -EINVAL;
|
632 |
} |
633 |
|
634 |
port->guest_connected = qemu_get_byte(f); |
635 |
s->post_load->connected[i].port = port; |
636 |
s->post_load->connected[i].host_connected = qemu_get_byte(f); |
637 |
|
638 |
if (version_id > 2) { |
639 |
uint32_t elem_popped; |
640 |
|
641 |
qemu_get_be32s(f, &elem_popped); |
642 |
if (elem_popped) {
|
643 |
qemu_get_be32s(f, &port->iov_idx); |
644 |
qemu_get_be64s(f, &port->iov_offset); |
645 |
|
646 |
qemu_get_buffer(f, (unsigned char *)&port->elem, |
647 |
sizeof(port->elem));
|
648 |
virtqueue_map_sg(port->elem.in_sg, port->elem.in_addr, |
649 |
port->elem.in_num, 1);
|
650 |
virtqueue_map_sg(port->elem.out_sg, port->elem.out_addr, |
651 |
port->elem.out_num, 1);
|
652 |
|
653 |
/*
|
654 |
* Port was throttled on source machine. Let's
|
655 |
* unthrottle it here so data starts flowing again.
|
656 |
*/
|
657 |
virtio_serial_throttle_port(port, false);
|
658 |
} |
659 |
} |
660 |
} |
661 |
qemu_mod_timer(s->post_load->timer, 1);
|
662 |
return 0; |
663 |
} |
664 |
|
665 |
static int virtio_serial_load(QEMUFile *f, void *opaque, int version_id) |
666 |
{ |
667 |
VirtIOSerial *s = opaque; |
668 |
uint32_t max_nr_ports, nr_active_ports, ports_map; |
669 |
unsigned int i; |
670 |
int ret;
|
671 |
|
672 |
if (version_id > 3) { |
673 |
return -EINVAL;
|
674 |
} |
675 |
|
676 |
/* The virtio device */
|
677 |
ret = virtio_load(&s->vdev, f); |
678 |
if (ret) {
|
679 |
return ret;
|
680 |
} |
681 |
|
682 |
if (version_id < 2) { |
683 |
return 0; |
684 |
} |
685 |
|
686 |
/* The config space */
|
687 |
qemu_get_be16s(f, &s->config.cols); |
688 |
qemu_get_be16s(f, &s->config.rows); |
689 |
|
690 |
qemu_get_be32s(f, &max_nr_ports); |
691 |
tswap32s(&max_nr_ports); |
692 |
if (max_nr_ports > tswap32(s->config.max_nr_ports)) {
|
693 |
/* Source could have had more ports than us. Fail migration. */
|
694 |
return -EINVAL;
|
695 |
} |
696 |
|
697 |
for (i = 0; i < (max_nr_ports + 31) / 32; i++) { |
698 |
qemu_get_be32s(f, &ports_map); |
699 |
|
700 |
if (ports_map != s->ports_map[i]) {
|
701 |
/*
|
702 |
* Ports active on source and destination don't
|
703 |
* match. Fail migration.
|
704 |
*/
|
705 |
return -EINVAL;
|
706 |
} |
707 |
} |
708 |
|
709 |
qemu_get_be32s(f, &nr_active_ports); |
710 |
|
711 |
if (nr_active_ports) {
|
712 |
ret = fetch_active_ports_list(f, version_id, s, nr_active_ports); |
713 |
if (ret) {
|
714 |
return ret;
|
715 |
} |
716 |
} |
717 |
return 0; |
718 |
} |
719 |
|
720 |
static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent); |
721 |
|
722 |
static Property virtser_props[] = {
|
723 |
DEFINE_PROP_UINT32("nr", VirtIOSerialPort, id, VIRTIO_CONSOLE_BAD_ID),
|
724 |
DEFINE_PROP_STRING("name", VirtIOSerialPort, name),
|
725 |
DEFINE_PROP_END_OF_LIST() |
726 |
}; |
727 |
|
728 |
#define TYPE_VIRTIO_SERIAL_BUS "virtio-serial-bus" |
729 |
#define VIRTIO_SERIAL_BUS(obj) \
|
730 |
OBJECT_CHECK(VirtIOSerialBus, (obj), TYPE_VIRTIO_SERIAL_BUS) |
731 |
|
732 |
static void virtser_bus_class_init(ObjectClass *klass, void *data) |
733 |
{ |
734 |
BusClass *k = BUS_CLASS(klass); |
735 |
k->print_dev = virtser_bus_dev_print; |
736 |
} |
737 |
|
738 |
static const TypeInfo virtser_bus_info = { |
739 |
.name = TYPE_VIRTIO_SERIAL_BUS, |
740 |
.parent = TYPE_BUS, |
741 |
.instance_size = sizeof(VirtIOSerialBus),
|
742 |
.class_init = virtser_bus_class_init, |
743 |
}; |
744 |
|
745 |
static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent) |
746 |
{ |
747 |
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev); |
748 |
|
749 |
monitor_printf(mon, "%*sport %d, guest %s, host %s, throttle %s\n",
|
750 |
indent, "", port->id,
|
751 |
port->guest_connected ? "on" : "off", |
752 |
port->host_connected ? "on" : "off", |
753 |
port->throttled ? "on" : "off"); |
754 |
} |
755 |
|
756 |
/* This function is only used if a port id is not provided by the user */
|
757 |
static uint32_t find_free_port_id(VirtIOSerial *vser)
|
758 |
{ |
759 |
unsigned int i, max_nr_ports; |
760 |
|
761 |
max_nr_ports = tswap32(vser->config.max_nr_ports); |
762 |
for (i = 0; i < (max_nr_ports + 31) / 32; i++) { |
763 |
uint32_t map, bit; |
764 |
|
765 |
map = vser->ports_map[i]; |
766 |
bit = ffs(~map); |
767 |
if (bit) {
|
768 |
return (bit - 1) + i * 32; |
769 |
} |
770 |
} |
771 |
return VIRTIO_CONSOLE_BAD_ID;
|
772 |
} |
773 |
|
774 |
static void mark_port_added(VirtIOSerial *vser, uint32_t port_id) |
775 |
{ |
776 |
unsigned int i; |
777 |
|
778 |
i = port_id / 32;
|
779 |
vser->ports_map[i] |= 1U << (port_id % 32); |
780 |
} |
781 |
|
782 |
static void add_port(VirtIOSerial *vser, uint32_t port_id) |
783 |
{ |
784 |
mark_port_added(vser, port_id); |
785 |
send_control_event(vser, port_id, VIRTIO_CONSOLE_PORT_ADD, 1);
|
786 |
} |
787 |
|
788 |
static void remove_port(VirtIOSerial *vser, uint32_t port_id) |
789 |
{ |
790 |
VirtIOSerialPort *port; |
791 |
unsigned int i; |
792 |
|
793 |
i = port_id / 32;
|
794 |
vser->ports_map[i] &= ~(1U << (port_id % 32)); |
795 |
|
796 |
port = find_port_by_id(vser, port_id); |
797 |
/*
|
798 |
* This function is only called from qdev's unplug callback; if we
|
799 |
* get a NULL port here, we're in trouble.
|
800 |
*/
|
801 |
assert(port); |
802 |
|
803 |
/* Flush out any unconsumed buffers first */
|
804 |
discard_vq_data(port->ovq, &port->vser->vdev); |
805 |
|
806 |
send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_REMOVE, 1);
|
807 |
} |
808 |
|
809 |
static int virtser_port_qdev_init(DeviceState *qdev) |
810 |
{ |
811 |
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev); |
812 |
VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
813 |
VirtIOSerialBus *bus = DO_UPCAST(VirtIOSerialBus, qbus, qdev->parent_bus); |
814 |
int ret, max_nr_ports;
|
815 |
bool plugging_port0;
|
816 |
|
817 |
port->vser = bus->vser; |
818 |
port->bh = qemu_bh_new(flush_queued_data_bh, port); |
819 |
|
820 |
assert(vsc->have_data); |
821 |
|
822 |
/*
|
823 |
* Is the first console port we're seeing? If so, put it up at
|
824 |
* location 0. This is done for backward compatibility (old
|
825 |
* kernel, new qemu).
|
826 |
*/
|
827 |
plugging_port0 = vsc->is_console && !find_port_by_id(port->vser, 0);
|
828 |
|
829 |
if (find_port_by_id(port->vser, port->id)) {
|
830 |
error_report("virtio-serial-bus: A port already exists at id %u",
|
831 |
port->id); |
832 |
return -1; |
833 |
} |
834 |
|
835 |
if (port->id == VIRTIO_CONSOLE_BAD_ID) {
|
836 |
if (plugging_port0) {
|
837 |
port->id = 0;
|
838 |
} else {
|
839 |
port->id = find_free_port_id(port->vser); |
840 |
if (port->id == VIRTIO_CONSOLE_BAD_ID) {
|
841 |
error_report("virtio-serial-bus: Maximum port limit for this device reached");
|
842 |
return -1; |
843 |
} |
844 |
} |
845 |
} |
846 |
|
847 |
max_nr_ports = tswap32(port->vser->config.max_nr_ports); |
848 |
if (port->id >= max_nr_ports) {
|
849 |
error_report("virtio-serial-bus: Out-of-range port id specified, max. allowed: %u",
|
850 |
max_nr_ports - 1);
|
851 |
return -1; |
852 |
} |
853 |
|
854 |
ret = vsc->init(port); |
855 |
if (ret) {
|
856 |
return ret;
|
857 |
} |
858 |
|
859 |
port->elem.out_num = 0;
|
860 |
|
861 |
QTAILQ_INSERT_TAIL(&port->vser->ports, port, next); |
862 |
port->ivq = port->vser->ivqs[port->id]; |
863 |
port->ovq = port->vser->ovqs[port->id]; |
864 |
|
865 |
add_port(port->vser, port->id); |
866 |
|
867 |
/* Send an update to the guest about this new port added */
|
868 |
virtio_notify_config(&port->vser->vdev); |
869 |
|
870 |
return ret;
|
871 |
} |
872 |
|
873 |
static int virtser_port_qdev_exit(DeviceState *qdev) |
874 |
{ |
875 |
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev); |
876 |
VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
877 |
VirtIOSerial *vser = port->vser; |
878 |
|
879 |
qemu_bh_delete(port->bh); |
880 |
remove_port(port->vser, port->id); |
881 |
|
882 |
QTAILQ_REMOVE(&vser->ports, port, next); |
883 |
|
884 |
if (vsc->exit) {
|
885 |
vsc->exit(port); |
886 |
} |
887 |
return 0; |
888 |
} |
889 |
|
890 |
VirtIODevice *virtio_serial_init(DeviceState *dev, virtio_serial_conf *conf) |
891 |
{ |
892 |
VirtIOSerial *vser; |
893 |
VirtIODevice *vdev; |
894 |
uint32_t i, max_supported_ports; |
895 |
|
896 |
if (!conf->max_virtserial_ports)
|
897 |
return NULL; |
898 |
|
899 |
/* Each port takes 2 queues, and one pair is for the control queue */
|
900 |
max_supported_ports = VIRTIO_PCI_QUEUE_MAX / 2 - 1; |
901 |
|
902 |
if (conf->max_virtserial_ports > max_supported_ports) {
|
903 |
error_report("maximum ports supported: %u", max_supported_ports);
|
904 |
return NULL; |
905 |
} |
906 |
|
907 |
vdev = virtio_common_init("virtio-serial", VIRTIO_ID_CONSOLE,
|
908 |
sizeof(struct virtio_console_config), |
909 |
sizeof(VirtIOSerial));
|
910 |
|
911 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
912 |
|
913 |
/* Spawn a new virtio-serial bus on which the ports will ride as devices */
|
914 |
qbus_create_inplace(&vser->bus.qbus, TYPE_VIRTIO_SERIAL_BUS, dev, NULL);
|
915 |
vser->bus.qbus.allow_hotplug = 1;
|
916 |
vser->bus.vser = vser; |
917 |
QTAILQ_INIT(&vser->ports); |
918 |
|
919 |
vser->bus.max_nr_ports = conf->max_virtserial_ports; |
920 |
vser->ivqs = g_malloc(conf->max_virtserial_ports * sizeof(VirtQueue *));
|
921 |
vser->ovqs = g_malloc(conf->max_virtserial_ports * sizeof(VirtQueue *));
|
922 |
|
923 |
/* Add a queue for host to guest transfers for port 0 (backward compat) */
|
924 |
vser->ivqs[0] = virtio_add_queue(vdev, 128, handle_input); |
925 |
/* Add a queue for guest to host transfers for port 0 (backward compat) */
|
926 |
vser->ovqs[0] = virtio_add_queue(vdev, 128, handle_output); |
927 |
|
928 |
/* TODO: host to guest notifications can get dropped
|
929 |
* if the queue fills up. Implement queueing in host,
|
930 |
* this might also make it possible to reduce the control
|
931 |
* queue size: as guest preposts buffers there,
|
932 |
* this will save 4Kbyte of guest memory per entry. */
|
933 |
|
934 |
/* control queue: host to guest */
|
935 |
vser->c_ivq = virtio_add_queue(vdev, 32, control_in);
|
936 |
/* control queue: guest to host */
|
937 |
vser->c_ovq = virtio_add_queue(vdev, 32, control_out);
|
938 |
|
939 |
for (i = 1; i < vser->bus.max_nr_ports; i++) { |
940 |
/* Add a per-port queue for host to guest transfers */
|
941 |
vser->ivqs[i] = virtio_add_queue(vdev, 128, handle_input);
|
942 |
/* Add a per-per queue for guest to host transfers */
|
943 |
vser->ovqs[i] = virtio_add_queue(vdev, 128, handle_output);
|
944 |
} |
945 |
|
946 |
vser->config.max_nr_ports = tswap32(conf->max_virtserial_ports); |
947 |
vser->ports_map = g_malloc0(((conf->max_virtserial_ports + 31) / 32) |
948 |
* sizeof(vser->ports_map[0])); |
949 |
/*
|
950 |
* Reserve location 0 for a console port for backward compat
|
951 |
* (old kernel, new qemu)
|
952 |
*/
|
953 |
mark_port_added(vser, 0);
|
954 |
|
955 |
vser->vdev.get_features = get_features; |
956 |
vser->vdev.get_config = get_config; |
957 |
vser->vdev.set_config = set_config; |
958 |
vser->vdev.set_status = set_status; |
959 |
vser->vdev.reset = vser_reset; |
960 |
|
961 |
vser->qdev = dev; |
962 |
|
963 |
vser->post_load = NULL;
|
964 |
|
965 |
/*
|
966 |
* Register for the savevm section with the virtio-console name
|
967 |
* to preserve backward compat
|
968 |
*/
|
969 |
register_savevm(dev, "virtio-console", -1, 3, virtio_serial_save, |
970 |
virtio_serial_load, vser); |
971 |
|
972 |
return vdev;
|
973 |
} |
974 |
|
975 |
void virtio_serial_exit(VirtIODevice *vdev)
|
976 |
{ |
977 |
VirtIOSerial *vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
978 |
|
979 |
unregister_savevm(vser->qdev, "virtio-console", vser);
|
980 |
|
981 |
g_free(vser->ivqs); |
982 |
g_free(vser->ovqs); |
983 |
g_free(vser->ports_map); |
984 |
if (vser->post_load) {
|
985 |
g_free(vser->post_load->connected); |
986 |
qemu_del_timer(vser->post_load->timer); |
987 |
qemu_free_timer(vser->post_load->timer); |
988 |
g_free(vser->post_load); |
989 |
} |
990 |
virtio_cleanup(vdev); |
991 |
} |
992 |
|
993 |
static void virtio_serial_port_class_init(ObjectClass *klass, void *data) |
994 |
{ |
995 |
DeviceClass *k = DEVICE_CLASS(klass); |
996 |
k->init = virtser_port_qdev_init; |
997 |
k->bus_type = TYPE_VIRTIO_SERIAL_BUS; |
998 |
k->exit = virtser_port_qdev_exit; |
999 |
k->unplug = qdev_simple_unplug_cb; |
1000 |
k->props = virtser_props; |
1001 |
} |
1002 |
|
1003 |
static const TypeInfo virtio_serial_port_type_info = { |
1004 |
.name = TYPE_VIRTIO_SERIAL_PORT, |
1005 |
.parent = TYPE_DEVICE, |
1006 |
.instance_size = sizeof(VirtIOSerialPort),
|
1007 |
.abstract = true,
|
1008 |
.class_size = sizeof(VirtIOSerialPortClass),
|
1009 |
.class_init = virtio_serial_port_class_init, |
1010 |
}; |
1011 |
|
1012 |
static void virtio_serial_register_types(void) |
1013 |
{ |
1014 |
type_register_static(&virtser_bus_info); |
1015 |
type_register_static(&virtio_serial_port_type_info); |
1016 |
} |
1017 |
|
1018 |
type_init(virtio_serial_register_types) |