root / hw / virtio-serial-bus.c @ 8294a64d
History | View | Annotate | Download (27.2 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 "iov.h" |
22 |
#include "monitor.h" |
23 |
#include "qemu-queue.h" |
24 |
#include "sysbus.h" |
25 |
#include "trace.h" |
26 |
#include "virtio-serial.h" |
27 |
|
28 |
/* The virtio-serial bus on top of which the ports will ride as devices */
|
29 |
struct VirtIOSerialBus {
|
30 |
BusState qbus; |
31 |
|
32 |
/* This is the parent device that provides the bus for ports. */
|
33 |
VirtIOSerial *vser; |
34 |
|
35 |
/* The maximum number of ports that can ride on top of this bus */
|
36 |
uint32_t max_nr_ports; |
37 |
}; |
38 |
|
39 |
struct VirtIOSerial {
|
40 |
VirtIODevice vdev; |
41 |
|
42 |
VirtQueue *c_ivq, *c_ovq; |
43 |
/* Arrays of ivqs and ovqs: one per port */
|
44 |
VirtQueue **ivqs, **ovqs; |
45 |
|
46 |
VirtIOSerialBus bus; |
47 |
|
48 |
DeviceState *qdev; |
49 |
|
50 |
QTAILQ_HEAD(, VirtIOSerialPort) ports; |
51 |
|
52 |
/* bitmap for identifying active ports */
|
53 |
uint32_t *ports_map; |
54 |
|
55 |
struct virtio_console_config config;
|
56 |
}; |
57 |
|
58 |
static VirtIOSerialPort *find_port_by_id(VirtIOSerial *vser, uint32_t id)
|
59 |
{ |
60 |
VirtIOSerialPort *port; |
61 |
|
62 |
if (id == VIRTIO_CONSOLE_BAD_ID) {
|
63 |
return NULL; |
64 |
} |
65 |
|
66 |
QTAILQ_FOREACH(port, &vser->ports, next) { |
67 |
if (port->id == id)
|
68 |
return port;
|
69 |
} |
70 |
return NULL; |
71 |
} |
72 |
|
73 |
static VirtIOSerialPort *find_port_by_vq(VirtIOSerial *vser, VirtQueue *vq)
|
74 |
{ |
75 |
VirtIOSerialPort *port; |
76 |
|
77 |
QTAILQ_FOREACH(port, &vser->ports, next) { |
78 |
if (port->ivq == vq || port->ovq == vq)
|
79 |
return port;
|
80 |
} |
81 |
return NULL; |
82 |
} |
83 |
|
84 |
static bool use_multiport(VirtIOSerial *vser) |
85 |
{ |
86 |
return vser->vdev.guest_features & (1 << VIRTIO_CONSOLE_F_MULTIPORT); |
87 |
} |
88 |
|
89 |
static size_t write_to_port(VirtIOSerialPort *port,
|
90 |
const uint8_t *buf, size_t size)
|
91 |
{ |
92 |
VirtQueueElement elem; |
93 |
VirtQueue *vq; |
94 |
size_t offset; |
95 |
|
96 |
vq = port->ivq; |
97 |
if (!virtio_queue_ready(vq)) {
|
98 |
return 0; |
99 |
} |
100 |
|
101 |
offset = 0;
|
102 |
while (offset < size) {
|
103 |
size_t len; |
104 |
|
105 |
if (!virtqueue_pop(vq, &elem)) {
|
106 |
break;
|
107 |
} |
108 |
|
109 |
len = iov_from_buf(elem.in_sg, elem.in_num, |
110 |
buf + offset, 0, size - offset);
|
111 |
offset += len; |
112 |
|
113 |
virtqueue_push(vq, &elem, len); |
114 |
} |
115 |
|
116 |
virtio_notify(&port->vser->vdev, vq); |
117 |
return offset;
|
118 |
} |
119 |
|
120 |
static void discard_vq_data(VirtQueue *vq, VirtIODevice *vdev) |
121 |
{ |
122 |
VirtQueueElement elem; |
123 |
|
124 |
if (!virtio_queue_ready(vq)) {
|
125 |
return;
|
126 |
} |
127 |
while (virtqueue_pop(vq, &elem)) {
|
128 |
virtqueue_push(vq, &elem, 0);
|
129 |
} |
130 |
virtio_notify(vdev, vq); |
131 |
} |
132 |
|
133 |
static void do_flush_queued_data(VirtIOSerialPort *port, VirtQueue *vq, |
134 |
VirtIODevice *vdev) |
135 |
{ |
136 |
VirtIOSerialPortClass *vsc; |
137 |
|
138 |
assert(port); |
139 |
assert(virtio_queue_ready(vq)); |
140 |
|
141 |
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
142 |
|
143 |
while (!port->throttled) {
|
144 |
unsigned int i; |
145 |
|
146 |
/* Pop an elem only if we haven't left off a previous one mid-way */
|
147 |
if (!port->elem.out_num) {
|
148 |
if (!virtqueue_pop(vq, &port->elem)) {
|
149 |
break;
|
150 |
} |
151 |
port->iov_idx = 0;
|
152 |
port->iov_offset = 0;
|
153 |
} |
154 |
|
155 |
for (i = port->iov_idx; i < port->elem.out_num; i++) {
|
156 |
size_t buf_size; |
157 |
ssize_t ret; |
158 |
|
159 |
buf_size = port->elem.out_sg[i].iov_len - port->iov_offset; |
160 |
ret = vsc->have_data(port, |
161 |
port->elem.out_sg[i].iov_base |
162 |
+ port->iov_offset, |
163 |
buf_size); |
164 |
if (ret < 0 && ret != -EAGAIN) { |
165 |
/* We don't handle any other type of errors here */
|
166 |
abort(); |
167 |
} |
168 |
if (ret == -EAGAIN || (ret >= 0 && ret < buf_size)) { |
169 |
/*
|
170 |
* this is a temporary check until chardevs can signal to
|
171 |
* frontends that they are writable again. This prevents
|
172 |
* the console from going into throttled mode (forever)
|
173 |
* if virtio-console is connected to a pty without a
|
174 |
* listener. Otherwise the guest spins forever.
|
175 |
* We can revert this if
|
176 |
* 1: chardevs can notify frondends
|
177 |
* 2: the guest driver does not spin in these cases
|
178 |
*/
|
179 |
if (!vsc->is_console) {
|
180 |
virtio_serial_throttle_port(port, true);
|
181 |
} |
182 |
port->iov_idx = i; |
183 |
if (ret > 0) { |
184 |
port->iov_offset += ret; |
185 |
} |
186 |
break;
|
187 |
} |
188 |
port->iov_offset = 0;
|
189 |
} |
190 |
if (port->throttled) {
|
191 |
break;
|
192 |
} |
193 |
virtqueue_push(vq, &port->elem, 0);
|
194 |
port->elem.out_num = 0;
|
195 |
} |
196 |
virtio_notify(vdev, vq); |
197 |
} |
198 |
|
199 |
static void flush_queued_data(VirtIOSerialPort *port) |
200 |
{ |
201 |
assert(port); |
202 |
|
203 |
if (!virtio_queue_ready(port->ovq)) {
|
204 |
return;
|
205 |
} |
206 |
do_flush_queued_data(port, port->ovq, &port->vser->vdev); |
207 |
} |
208 |
|
209 |
static size_t send_control_msg(VirtIOSerialPort *port, void *buf, size_t len) |
210 |
{ |
211 |
VirtQueueElement elem; |
212 |
VirtQueue *vq; |
213 |
struct virtio_console_control *cpkt;
|
214 |
|
215 |
vq = port->vser->c_ivq; |
216 |
if (!virtio_queue_ready(vq)) {
|
217 |
return 0; |
218 |
} |
219 |
if (!virtqueue_pop(vq, &elem)) {
|
220 |
return 0; |
221 |
} |
222 |
|
223 |
cpkt = (struct virtio_console_control *)buf;
|
224 |
stl_p(&cpkt->id, port->id); |
225 |
memcpy(elem.in_sg[0].iov_base, buf, len);
|
226 |
|
227 |
virtqueue_push(vq, &elem, len); |
228 |
virtio_notify(&port->vser->vdev, vq); |
229 |
return len;
|
230 |
} |
231 |
|
232 |
static size_t send_control_event(VirtIOSerialPort *port, uint16_t event,
|
233 |
uint16_t value) |
234 |
{ |
235 |
struct virtio_console_control cpkt;
|
236 |
|
237 |
stw_p(&cpkt.event, event); |
238 |
stw_p(&cpkt.value, value); |
239 |
|
240 |
trace_virtio_serial_send_control_event(port->id, event, value); |
241 |
return send_control_msg(port, &cpkt, sizeof(cpkt)); |
242 |
} |
243 |
|
244 |
/* Functions for use inside qemu to open and read from/write to ports */
|
245 |
int virtio_serial_open(VirtIOSerialPort *port)
|
246 |
{ |
247 |
/* Don't allow opening an already-open port */
|
248 |
if (port->host_connected) {
|
249 |
return 0; |
250 |
} |
251 |
/* Send port open notification to the guest */
|
252 |
port->host_connected = true;
|
253 |
send_control_event(port, VIRTIO_CONSOLE_PORT_OPEN, 1);
|
254 |
|
255 |
return 0; |
256 |
} |
257 |
|
258 |
int virtio_serial_close(VirtIOSerialPort *port)
|
259 |
{ |
260 |
port->host_connected = false;
|
261 |
/*
|
262 |
* If there's any data the guest sent which the app didn't
|
263 |
* consume, reset the throttling flag and discard the data.
|
264 |
*/
|
265 |
port->throttled = false;
|
266 |
discard_vq_data(port->ovq, &port->vser->vdev); |
267 |
|
268 |
send_control_event(port, VIRTIO_CONSOLE_PORT_OPEN, 0);
|
269 |
|
270 |
return 0; |
271 |
} |
272 |
|
273 |
/* Individual ports/apps call this function to write to the guest. */
|
274 |
ssize_t virtio_serial_write(VirtIOSerialPort *port, const uint8_t *buf,
|
275 |
size_t size) |
276 |
{ |
277 |
if (!port || !port->host_connected || !port->guest_connected) {
|
278 |
return 0; |
279 |
} |
280 |
return write_to_port(port, buf, size);
|
281 |
} |
282 |
|
283 |
/*
|
284 |
* Readiness of the guest to accept data on a port.
|
285 |
* Returns max. data the guest can receive
|
286 |
*/
|
287 |
size_t virtio_serial_guest_ready(VirtIOSerialPort *port) |
288 |
{ |
289 |
VirtQueue *vq = port->ivq; |
290 |
|
291 |
if (!virtio_queue_ready(vq) ||
|
292 |
!(port->vser->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK) || |
293 |
virtio_queue_empty(vq)) { |
294 |
return 0; |
295 |
} |
296 |
if (use_multiport(port->vser) && !port->guest_connected) {
|
297 |
return 0; |
298 |
} |
299 |
|
300 |
if (virtqueue_avail_bytes(vq, 4096, 0)) { |
301 |
return 4096; |
302 |
} |
303 |
if (virtqueue_avail_bytes(vq, 1, 0)) { |
304 |
return 1; |
305 |
} |
306 |
return 0; |
307 |
} |
308 |
|
309 |
static void flush_queued_data_bh(void *opaque) |
310 |
{ |
311 |
VirtIOSerialPort *port = opaque; |
312 |
|
313 |
flush_queued_data(port); |
314 |
} |
315 |
|
316 |
void virtio_serial_throttle_port(VirtIOSerialPort *port, bool throttle) |
317 |
{ |
318 |
if (!port) {
|
319 |
return;
|
320 |
} |
321 |
|
322 |
trace_virtio_serial_throttle_port(port->id, throttle); |
323 |
port->throttled = throttle; |
324 |
if (throttle) {
|
325 |
return;
|
326 |
} |
327 |
qemu_bh_schedule(port->bh); |
328 |
} |
329 |
|
330 |
/* Guest wants to notify us of some event */
|
331 |
static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len) |
332 |
{ |
333 |
struct VirtIOSerialPort *port;
|
334 |
VirtIOSerialPortClass *vsc; |
335 |
struct virtio_console_control cpkt, *gcpkt;
|
336 |
uint8_t *buffer; |
337 |
size_t buffer_len; |
338 |
|
339 |
gcpkt = buf; |
340 |
|
341 |
if (len < sizeof(cpkt)) { |
342 |
/* The guest sent an invalid control packet */
|
343 |
return;
|
344 |
} |
345 |
|
346 |
cpkt.event = lduw_p(&gcpkt->event); |
347 |
cpkt.value = lduw_p(&gcpkt->value); |
348 |
|
349 |
trace_virtio_serial_handle_control_message(cpkt.event, cpkt.value); |
350 |
|
351 |
if (cpkt.event == VIRTIO_CONSOLE_DEVICE_READY) {
|
352 |
if (!cpkt.value) {
|
353 |
error_report("virtio-serial-bus: Guest failure in adding device %s",
|
354 |
vser->bus.qbus.name); |
355 |
return;
|
356 |
} |
357 |
/*
|
358 |
* The device is up, we can now tell the device about all the
|
359 |
* ports we have here.
|
360 |
*/
|
361 |
QTAILQ_FOREACH(port, &vser->ports, next) { |
362 |
send_control_event(port, VIRTIO_CONSOLE_PORT_ADD, 1);
|
363 |
} |
364 |
return;
|
365 |
} |
366 |
|
367 |
port = find_port_by_id(vser, ldl_p(&gcpkt->id)); |
368 |
if (!port) {
|
369 |
error_report("virtio-serial-bus: Unexpected port id %u for device %s",
|
370 |
ldl_p(&gcpkt->id), vser->bus.qbus.name); |
371 |
return;
|
372 |
} |
373 |
|
374 |
trace_virtio_serial_handle_control_message_port(port->id); |
375 |
|
376 |
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
377 |
|
378 |
switch(cpkt.event) {
|
379 |
case VIRTIO_CONSOLE_PORT_READY:
|
380 |
if (!cpkt.value) {
|
381 |
error_report("virtio-serial-bus: Guest failure in adding port %u for device %s",
|
382 |
port->id, vser->bus.qbus.name); |
383 |
break;
|
384 |
} |
385 |
/*
|
386 |
* Now that we know the guest asked for the port name, we're
|
387 |
* sure the guest has initialised whatever state is necessary
|
388 |
* for this port. Now's a good time to let the guest know if
|
389 |
* this port is a console port so that the guest can hook it
|
390 |
* up to hvc.
|
391 |
*/
|
392 |
if (vsc->is_console) {
|
393 |
send_control_event(port, VIRTIO_CONSOLE_CONSOLE_PORT, 1);
|
394 |
} |
395 |
|
396 |
if (port->name) {
|
397 |
stw_p(&cpkt.event, VIRTIO_CONSOLE_PORT_NAME); |
398 |
stw_p(&cpkt.value, 1);
|
399 |
|
400 |
buffer_len = sizeof(cpkt) + strlen(port->name) + 1; |
401 |
buffer = g_malloc(buffer_len); |
402 |
|
403 |
memcpy(buffer, &cpkt, sizeof(cpkt));
|
404 |
memcpy(buffer + sizeof(cpkt), port->name, strlen(port->name));
|
405 |
buffer[buffer_len - 1] = 0; |
406 |
|
407 |
send_control_msg(port, buffer, buffer_len); |
408 |
g_free(buffer); |
409 |
} |
410 |
|
411 |
if (port->host_connected) {
|
412 |
send_control_event(port, VIRTIO_CONSOLE_PORT_OPEN, 1);
|
413 |
} |
414 |
|
415 |
/*
|
416 |
* When the guest has asked us for this information it means
|
417 |
* the guest is all setup and has its virtqueues
|
418 |
* initialised. If some app is interested in knowing about
|
419 |
* this event, let it know.
|
420 |
*/
|
421 |
if (vsc->guest_ready) {
|
422 |
vsc->guest_ready(port); |
423 |
} |
424 |
break;
|
425 |
|
426 |
case VIRTIO_CONSOLE_PORT_OPEN:
|
427 |
port->guest_connected = cpkt.value; |
428 |
if (cpkt.value && vsc->guest_open) {
|
429 |
/* Send the guest opened notification if an app is interested */
|
430 |
vsc->guest_open(port); |
431 |
} |
432 |
|
433 |
if (!cpkt.value && vsc->guest_close) {
|
434 |
/* Send the guest closed notification if an app is interested */
|
435 |
vsc->guest_close(port); |
436 |
} |
437 |
break;
|
438 |
} |
439 |
} |
440 |
|
441 |
static void control_in(VirtIODevice *vdev, VirtQueue *vq) |
442 |
{ |
443 |
} |
444 |
|
445 |
static void control_out(VirtIODevice *vdev, VirtQueue *vq) |
446 |
{ |
447 |
VirtQueueElement elem; |
448 |
VirtIOSerial *vser; |
449 |
uint8_t *buf; |
450 |
size_t len; |
451 |
|
452 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
453 |
|
454 |
len = 0;
|
455 |
buf = NULL;
|
456 |
while (virtqueue_pop(vq, &elem)) {
|
457 |
size_t cur_len, copied; |
458 |
|
459 |
cur_len = iov_size(elem.out_sg, elem.out_num); |
460 |
/*
|
461 |
* Allocate a new buf only if we didn't have one previously or
|
462 |
* if the size of the buf differs
|
463 |
*/
|
464 |
if (cur_len > len) {
|
465 |
g_free(buf); |
466 |
|
467 |
buf = g_malloc(cur_len); |
468 |
len = cur_len; |
469 |
} |
470 |
copied = iov_to_buf(elem.out_sg, elem.out_num, buf, 0, len);
|
471 |
|
472 |
handle_control_message(vser, buf, copied); |
473 |
virtqueue_push(vq, &elem, 0);
|
474 |
} |
475 |
g_free(buf); |
476 |
virtio_notify(vdev, vq); |
477 |
} |
478 |
|
479 |
/* Guest wrote something to some port. */
|
480 |
static void handle_output(VirtIODevice *vdev, VirtQueue *vq) |
481 |
{ |
482 |
VirtIOSerial *vser; |
483 |
VirtIOSerialPort *port; |
484 |
|
485 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
486 |
port = find_port_by_vq(vser, vq); |
487 |
|
488 |
if (!port || !port->host_connected) {
|
489 |
discard_vq_data(vq, vdev); |
490 |
return;
|
491 |
} |
492 |
|
493 |
if (!port->throttled) {
|
494 |
do_flush_queued_data(port, vq, vdev); |
495 |
return;
|
496 |
} |
497 |
} |
498 |
|
499 |
static void handle_input(VirtIODevice *vdev, VirtQueue *vq) |
500 |
{ |
501 |
} |
502 |
|
503 |
static uint32_t get_features(VirtIODevice *vdev, uint32_t features)
|
504 |
{ |
505 |
VirtIOSerial *vser; |
506 |
|
507 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
508 |
|
509 |
if (vser->bus.max_nr_ports > 1) { |
510 |
features |= (1 << VIRTIO_CONSOLE_F_MULTIPORT);
|
511 |
} |
512 |
return features;
|
513 |
} |
514 |
|
515 |
/* Guest requested config info */
|
516 |
static void get_config(VirtIODevice *vdev, uint8_t *config_data) |
517 |
{ |
518 |
VirtIOSerial *vser; |
519 |
|
520 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
521 |
memcpy(config_data, &vser->config, sizeof(struct virtio_console_config)); |
522 |
} |
523 |
|
524 |
static void set_config(VirtIODevice *vdev, const uint8_t *config_data) |
525 |
{ |
526 |
struct virtio_console_config config;
|
527 |
|
528 |
memcpy(&config, config_data, sizeof(config));
|
529 |
} |
530 |
|
531 |
static void guest_reset(VirtIOSerial *vser) |
532 |
{ |
533 |
VirtIOSerialPort *port; |
534 |
VirtIOSerialPortClass *vsc; |
535 |
|
536 |
QTAILQ_FOREACH(port, &vser->ports, next) { |
537 |
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
538 |
if (port->guest_connected) {
|
539 |
port->guest_connected = false;
|
540 |
|
541 |
if (vsc->guest_close)
|
542 |
vsc->guest_close(port); |
543 |
} |
544 |
} |
545 |
} |
546 |
|
547 |
static void set_status(VirtIODevice *vdev, uint8_t status) |
548 |
{ |
549 |
VirtIOSerial *vser; |
550 |
VirtIOSerialPort *port; |
551 |
|
552 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
553 |
port = find_port_by_id(vser, 0);
|
554 |
|
555 |
if (port && !use_multiport(port->vser)
|
556 |
&& (status & VIRTIO_CONFIG_S_DRIVER_OK)) { |
557 |
/*
|
558 |
* Non-multiport guests won't be able to tell us guest
|
559 |
* open/close status. Such guests can only have a port at id
|
560 |
* 0, so set guest_connected for such ports as soon as guest
|
561 |
* is up.
|
562 |
*/
|
563 |
port->guest_connected = true;
|
564 |
} |
565 |
if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
566 |
guest_reset(vser); |
567 |
} |
568 |
} |
569 |
|
570 |
static void vser_reset(VirtIODevice *vdev) |
571 |
{ |
572 |
VirtIOSerial *vser; |
573 |
|
574 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
575 |
guest_reset(vser); |
576 |
} |
577 |
|
578 |
static void virtio_serial_save(QEMUFile *f, void *opaque) |
579 |
{ |
580 |
VirtIOSerial *s = opaque; |
581 |
VirtIOSerialPort *port; |
582 |
uint32_t nr_active_ports; |
583 |
unsigned int i, max_nr_ports; |
584 |
|
585 |
/* The virtio device */
|
586 |
virtio_save(&s->vdev, f); |
587 |
|
588 |
/* The config space */
|
589 |
qemu_put_be16s(f, &s->config.cols); |
590 |
qemu_put_be16s(f, &s->config.rows); |
591 |
|
592 |
qemu_put_be32s(f, &s->config.max_nr_ports); |
593 |
|
594 |
/* The ports map */
|
595 |
max_nr_ports = tswap32(s->config.max_nr_ports); |
596 |
for (i = 0; i < (max_nr_ports + 31) / 32; i++) { |
597 |
qemu_put_be32s(f, &s->ports_map[i]); |
598 |
} |
599 |
|
600 |
/* Ports */
|
601 |
|
602 |
nr_active_ports = 0;
|
603 |
QTAILQ_FOREACH(port, &s->ports, next) { |
604 |
nr_active_ports++; |
605 |
} |
606 |
|
607 |
qemu_put_be32s(f, &nr_active_ports); |
608 |
|
609 |
/*
|
610 |
* Items in struct VirtIOSerialPort.
|
611 |
*/
|
612 |
QTAILQ_FOREACH(port, &s->ports, next) { |
613 |
uint32_t elem_popped; |
614 |
|
615 |
qemu_put_be32s(f, &port->id); |
616 |
qemu_put_byte(f, port->guest_connected); |
617 |
qemu_put_byte(f, port->host_connected); |
618 |
|
619 |
elem_popped = 0;
|
620 |
if (port->elem.out_num) {
|
621 |
elem_popped = 1;
|
622 |
} |
623 |
qemu_put_be32s(f, &elem_popped); |
624 |
if (elem_popped) {
|
625 |
qemu_put_be32s(f, &port->iov_idx); |
626 |
qemu_put_be64s(f, &port->iov_offset); |
627 |
|
628 |
qemu_put_buffer(f, (unsigned char *)&port->elem, |
629 |
sizeof(port->elem));
|
630 |
} |
631 |
} |
632 |
} |
633 |
|
634 |
static int virtio_serial_load(QEMUFile *f, void *opaque, int version_id) |
635 |
{ |
636 |
VirtIOSerial *s = opaque; |
637 |
VirtIOSerialPort *port; |
638 |
uint32_t max_nr_ports, nr_active_ports, ports_map; |
639 |
unsigned int i; |
640 |
int ret;
|
641 |
|
642 |
if (version_id > 3) { |
643 |
return -EINVAL;
|
644 |
} |
645 |
|
646 |
/* The virtio device */
|
647 |
ret = virtio_load(&s->vdev, f); |
648 |
if (ret) {
|
649 |
return ret;
|
650 |
} |
651 |
|
652 |
if (version_id < 2) { |
653 |
return 0; |
654 |
} |
655 |
|
656 |
/* The config space */
|
657 |
qemu_get_be16s(f, &s->config.cols); |
658 |
qemu_get_be16s(f, &s->config.rows); |
659 |
|
660 |
qemu_get_be32s(f, &max_nr_ports); |
661 |
tswap32s(&max_nr_ports); |
662 |
if (max_nr_ports > tswap32(s->config.max_nr_ports)) {
|
663 |
/* Source could have had more ports than us. Fail migration. */
|
664 |
return -EINVAL;
|
665 |
} |
666 |
|
667 |
for (i = 0; i < (max_nr_ports + 31) / 32; i++) { |
668 |
qemu_get_be32s(f, &ports_map); |
669 |
|
670 |
if (ports_map != s->ports_map[i]) {
|
671 |
/*
|
672 |
* Ports active on source and destination don't
|
673 |
* match. Fail migration.
|
674 |
*/
|
675 |
return -EINVAL;
|
676 |
} |
677 |
} |
678 |
|
679 |
qemu_get_be32s(f, &nr_active_ports); |
680 |
|
681 |
/* Items in struct VirtIOSerialPort */
|
682 |
for (i = 0; i < nr_active_ports; i++) { |
683 |
uint32_t id; |
684 |
bool host_connected;
|
685 |
|
686 |
id = qemu_get_be32(f); |
687 |
port = find_port_by_id(s, id); |
688 |
if (!port) {
|
689 |
return -EINVAL;
|
690 |
} |
691 |
|
692 |
port->guest_connected = qemu_get_byte(f); |
693 |
host_connected = qemu_get_byte(f); |
694 |
if (host_connected != port->host_connected) {
|
695 |
/*
|
696 |
* We have to let the guest know of the host connection
|
697 |
* status change
|
698 |
*/
|
699 |
send_control_event(port, VIRTIO_CONSOLE_PORT_OPEN, |
700 |
port->host_connected); |
701 |
} |
702 |
|
703 |
if (version_id > 2) { |
704 |
uint32_t elem_popped; |
705 |
|
706 |
qemu_get_be32s(f, &elem_popped); |
707 |
if (elem_popped) {
|
708 |
qemu_get_be32s(f, &port->iov_idx); |
709 |
qemu_get_be64s(f, &port->iov_offset); |
710 |
|
711 |
qemu_get_buffer(f, (unsigned char *)&port->elem, |
712 |
sizeof(port->elem));
|
713 |
virtqueue_map_sg(port->elem.in_sg, port->elem.in_addr, |
714 |
port->elem.in_num, 1);
|
715 |
virtqueue_map_sg(port->elem.out_sg, port->elem.out_addr, |
716 |
port->elem.out_num, 1);
|
717 |
|
718 |
/*
|
719 |
* Port was throttled on source machine. Let's
|
720 |
* unthrottle it here so data starts flowing again.
|
721 |
*/
|
722 |
virtio_serial_throttle_port(port, false);
|
723 |
} |
724 |
} |
725 |
} |
726 |
return 0; |
727 |
} |
728 |
|
729 |
static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent); |
730 |
|
731 |
static struct BusInfo virtser_bus_info = { |
732 |
.name = "virtio-serial-bus",
|
733 |
.size = sizeof(VirtIOSerialBus),
|
734 |
.print_dev = virtser_bus_dev_print, |
735 |
.props = (Property[]) { |
736 |
DEFINE_PROP_UINT32("nr", VirtIOSerialPort, id, VIRTIO_CONSOLE_BAD_ID),
|
737 |
DEFINE_PROP_STRING("name", VirtIOSerialPort, name),
|
738 |
DEFINE_PROP_END_OF_LIST() |
739 |
} |
740 |
}; |
741 |
|
742 |
static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent) |
743 |
{ |
744 |
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev); |
745 |
|
746 |
monitor_printf(mon, "%*sport %d, guest %s, host %s, throttle %s\n",
|
747 |
indent, "", port->id,
|
748 |
port->guest_connected ? "on" : "off", |
749 |
port->host_connected ? "on" : "off", |
750 |
port->throttled ? "on" : "off"); |
751 |
} |
752 |
|
753 |
/* This function is only used if a port id is not provided by the user */
|
754 |
static uint32_t find_free_port_id(VirtIOSerial *vser)
|
755 |
{ |
756 |
unsigned int i, max_nr_ports; |
757 |
|
758 |
max_nr_ports = tswap32(vser->config.max_nr_ports); |
759 |
for (i = 0; i < (max_nr_ports + 31) / 32; i++) { |
760 |
uint32_t map, bit; |
761 |
|
762 |
map = vser->ports_map[i]; |
763 |
bit = ffs(~map); |
764 |
if (bit) {
|
765 |
return (bit - 1) + i * 32; |
766 |
} |
767 |
} |
768 |
return VIRTIO_CONSOLE_BAD_ID;
|
769 |
} |
770 |
|
771 |
static void mark_port_added(VirtIOSerial *vser, uint32_t port_id) |
772 |
{ |
773 |
unsigned int i; |
774 |
|
775 |
i = port_id / 32;
|
776 |
vser->ports_map[i] |= 1U << (port_id % 32); |
777 |
} |
778 |
|
779 |
static void add_port(VirtIOSerial *vser, uint32_t port_id) |
780 |
{ |
781 |
mark_port_added(vser, port_id); |
782 |
|
783 |
send_control_event(find_port_by_id(vser, port_id), |
784 |
VIRTIO_CONSOLE_PORT_ADD, 1);
|
785 |
} |
786 |
|
787 |
static void remove_port(VirtIOSerial *vser, uint32_t port_id) |
788 |
{ |
789 |
VirtIOSerialPort *port; |
790 |
unsigned int i; |
791 |
|
792 |
i = port_id / 32;
|
793 |
vser->ports_map[i] &= ~(1U << (port_id % 32)); |
794 |
|
795 |
port = find_port_by_id(vser, port_id); |
796 |
/* Flush out any unconsumed buffers first */
|
797 |
discard_vq_data(port->ovq, &port->vser->vdev); |
798 |
|
799 |
send_control_event(port, VIRTIO_CONSOLE_PORT_REMOVE, 1);
|
800 |
} |
801 |
|
802 |
static int virtser_port_qdev_init(DeviceState *qdev) |
803 |
{ |
804 |
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev); |
805 |
VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
806 |
VirtIOSerialBus *bus = DO_UPCAST(VirtIOSerialBus, qbus, qdev->parent_bus); |
807 |
int ret, max_nr_ports;
|
808 |
bool plugging_port0;
|
809 |
|
810 |
port->vser = bus->vser; |
811 |
port->bh = qemu_bh_new(flush_queued_data_bh, port); |
812 |
|
813 |
assert(vsc->have_data); |
814 |
|
815 |
/*
|
816 |
* Is the first console port we're seeing? If so, put it up at
|
817 |
* location 0. This is done for backward compatibility (old
|
818 |
* kernel, new qemu).
|
819 |
*/
|
820 |
plugging_port0 = vsc->is_console && !find_port_by_id(port->vser, 0);
|
821 |
|
822 |
if (find_port_by_id(port->vser, port->id)) {
|
823 |
error_report("virtio-serial-bus: A port already exists at id %u",
|
824 |
port->id); |
825 |
return -1; |
826 |
} |
827 |
|
828 |
if (port->id == VIRTIO_CONSOLE_BAD_ID) {
|
829 |
if (plugging_port0) {
|
830 |
port->id = 0;
|
831 |
} else {
|
832 |
port->id = find_free_port_id(port->vser); |
833 |
if (port->id == VIRTIO_CONSOLE_BAD_ID) {
|
834 |
error_report("virtio-serial-bus: Maximum port limit for this device reached");
|
835 |
return -1; |
836 |
} |
837 |
} |
838 |
} |
839 |
|
840 |
max_nr_ports = tswap32(port->vser->config.max_nr_ports); |
841 |
if (port->id >= max_nr_ports) {
|
842 |
error_report("virtio-serial-bus: Out-of-range port id specified, max. allowed: %u",
|
843 |
max_nr_ports - 1);
|
844 |
return -1; |
845 |
} |
846 |
|
847 |
ret = vsc->init(port); |
848 |
if (ret) {
|
849 |
return ret;
|
850 |
} |
851 |
|
852 |
port->elem.out_num = 0;
|
853 |
|
854 |
QTAILQ_INSERT_TAIL(&port->vser->ports, port, next); |
855 |
port->ivq = port->vser->ivqs[port->id]; |
856 |
port->ovq = port->vser->ovqs[port->id]; |
857 |
|
858 |
add_port(port->vser, port->id); |
859 |
|
860 |
/* Send an update to the guest about this new port added */
|
861 |
virtio_notify_config(&port->vser->vdev); |
862 |
|
863 |
return ret;
|
864 |
} |
865 |
|
866 |
static int virtser_port_qdev_exit(DeviceState *qdev) |
867 |
{ |
868 |
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev); |
869 |
VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
870 |
VirtIOSerial *vser = port->vser; |
871 |
|
872 |
qemu_bh_delete(port->bh); |
873 |
remove_port(port->vser, port->id); |
874 |
|
875 |
QTAILQ_REMOVE(&vser->ports, port, next); |
876 |
|
877 |
if (vsc->exit) {
|
878 |
vsc->exit(port); |
879 |
} |
880 |
return 0; |
881 |
} |
882 |
|
883 |
VirtIODevice *virtio_serial_init(DeviceState *dev, virtio_serial_conf *conf) |
884 |
{ |
885 |
VirtIOSerial *vser; |
886 |
VirtIODevice *vdev; |
887 |
uint32_t i, max_supported_ports; |
888 |
|
889 |
if (!conf->max_virtserial_ports)
|
890 |
return NULL; |
891 |
|
892 |
/* Each port takes 2 queues, and one pair is for the control queue */
|
893 |
max_supported_ports = VIRTIO_PCI_QUEUE_MAX / 2 - 1; |
894 |
|
895 |
if (conf->max_virtserial_ports > max_supported_ports) {
|
896 |
error_report("maximum ports supported: %u", max_supported_ports);
|
897 |
return NULL; |
898 |
} |
899 |
|
900 |
vdev = virtio_common_init("virtio-serial", VIRTIO_ID_CONSOLE,
|
901 |
sizeof(struct virtio_console_config), |
902 |
sizeof(VirtIOSerial));
|
903 |
|
904 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
905 |
|
906 |
/* Spawn a new virtio-serial bus on which the ports will ride as devices */
|
907 |
qbus_create_inplace(&vser->bus.qbus, &virtser_bus_info, dev, NULL);
|
908 |
vser->bus.qbus.allow_hotplug = 1;
|
909 |
vser->bus.vser = vser; |
910 |
QTAILQ_INIT(&vser->ports); |
911 |
|
912 |
vser->bus.max_nr_ports = conf->max_virtserial_ports; |
913 |
vser->ivqs = g_malloc(conf->max_virtserial_ports * sizeof(VirtQueue *));
|
914 |
vser->ovqs = g_malloc(conf->max_virtserial_ports * sizeof(VirtQueue *));
|
915 |
|
916 |
/* Add a queue for host to guest transfers for port 0 (backward compat) */
|
917 |
vser->ivqs[0] = virtio_add_queue(vdev, 128, handle_input); |
918 |
/* Add a queue for guest to host transfers for port 0 (backward compat) */
|
919 |
vser->ovqs[0] = virtio_add_queue(vdev, 128, handle_output); |
920 |
|
921 |
/* TODO: host to guest notifications can get dropped
|
922 |
* if the queue fills up. Implement queueing in host,
|
923 |
* this might also make it possible to reduce the control
|
924 |
* queue size: as guest preposts buffers there,
|
925 |
* this will save 4Kbyte of guest memory per entry. */
|
926 |
|
927 |
/* control queue: host to guest */
|
928 |
vser->c_ivq = virtio_add_queue(vdev, 32, control_in);
|
929 |
/* control queue: guest to host */
|
930 |
vser->c_ovq = virtio_add_queue(vdev, 32, control_out);
|
931 |
|
932 |
for (i = 1; i < vser->bus.max_nr_ports; i++) { |
933 |
/* Add a per-port queue for host to guest transfers */
|
934 |
vser->ivqs[i] = virtio_add_queue(vdev, 128, handle_input);
|
935 |
/* Add a per-per queue for guest to host transfers */
|
936 |
vser->ovqs[i] = virtio_add_queue(vdev, 128, handle_output);
|
937 |
} |
938 |
|
939 |
vser->config.max_nr_ports = tswap32(conf->max_virtserial_ports); |
940 |
vser->ports_map = g_malloc0(((conf->max_virtserial_ports + 31) / 32) |
941 |
* sizeof(vser->ports_map[0])); |
942 |
/*
|
943 |
* Reserve location 0 for a console port for backward compat
|
944 |
* (old kernel, new qemu)
|
945 |
*/
|
946 |
mark_port_added(vser, 0);
|
947 |
|
948 |
vser->vdev.get_features = get_features; |
949 |
vser->vdev.get_config = get_config; |
950 |
vser->vdev.set_config = set_config; |
951 |
vser->vdev.set_status = set_status; |
952 |
vser->vdev.reset = vser_reset; |
953 |
|
954 |
vser->qdev = dev; |
955 |
|
956 |
/*
|
957 |
* Register for the savevm section with the virtio-console name
|
958 |
* to preserve backward compat
|
959 |
*/
|
960 |
register_savevm(dev, "virtio-console", -1, 3, virtio_serial_save, |
961 |
virtio_serial_load, vser); |
962 |
|
963 |
return vdev;
|
964 |
} |
965 |
|
966 |
void virtio_serial_exit(VirtIODevice *vdev)
|
967 |
{ |
968 |
VirtIOSerial *vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
969 |
|
970 |
unregister_savevm(vser->qdev, "virtio-console", vser);
|
971 |
|
972 |
g_free(vser->ivqs); |
973 |
g_free(vser->ovqs); |
974 |
g_free(vser->ports_map); |
975 |
|
976 |
virtio_cleanup(vdev); |
977 |
} |
978 |
|
979 |
static void virtio_serial_port_class_init(ObjectClass *klass, void *data) |
980 |
{ |
981 |
DeviceClass *k = DEVICE_CLASS(klass); |
982 |
k->init = virtser_port_qdev_init; |
983 |
k->bus_info = &virtser_bus_info; |
984 |
k->exit = virtser_port_qdev_exit; |
985 |
k->unplug = qdev_simple_unplug_cb; |
986 |
} |
987 |
|
988 |
static TypeInfo virtio_serial_port_type_info = {
|
989 |
.name = TYPE_VIRTIO_SERIAL_PORT, |
990 |
.parent = TYPE_DEVICE, |
991 |
.instance_size = sizeof(VirtIOSerialPort),
|
992 |
.abstract = true,
|
993 |
.class_size = sizeof(VirtIOSerialPortClass),
|
994 |
.class_init = virtio_serial_port_class_init, |
995 |
}; |
996 |
|
997 |
static void virtio_serial_register_types(void) |
998 |
{ |
999 |
type_register_static(&virtio_serial_port_type_info); |
1000 |
} |
1001 |
|
1002 |
type_init(virtio_serial_register_types) |