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13#include "qemu/osdep.h"
14#include "chardev/char-fe.h"
15#include "qemu/error-report.h"
16#include "trace.h"
17#include "hw/virtio/virtio-serial.h"
18#include "qapi/error.h"
19#include "qapi/qapi-events-char.h"
20
21#define TYPE_VIRTIO_CONSOLE_SERIAL_PORT "virtserialport"
22#define VIRTIO_CONSOLE(obj) \
23 OBJECT_CHECK(VirtConsole, (obj), TYPE_VIRTIO_CONSOLE_SERIAL_PORT)
24
25typedef struct VirtConsole {
26 VirtIOSerialPort parent_obj;
27
28 CharBackend chr;
29 guint watch;
30} VirtConsole;
31
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35
36static gboolean chr_write_unblocked(GIOChannel *chan, GIOCondition cond,
37 void *opaque)
38{
39 VirtConsole *vcon = opaque;
40
41 vcon->watch = 0;
42 virtio_serial_throttle_port(VIRTIO_SERIAL_PORT(vcon), false);
43 return FALSE;
44}
45
46
47static ssize_t flush_buf(VirtIOSerialPort *port,
48 const uint8_t *buf, ssize_t len)
49{
50 VirtConsole *vcon = VIRTIO_CONSOLE(port);
51 ssize_t ret;
52
53 if (!qemu_chr_fe_backend_connected(&vcon->chr)) {
54
55 return len;
56 }
57
58 ret = qemu_chr_fe_write(&vcon->chr, buf, len);
59 trace_virtio_console_flush_buf(port->id, len, ret);
60
61 if (ret < len) {
62 VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port);
63
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67
68
69
70 if (ret < 0)
71 ret = 0;
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93 if (!k->is_console) {
94 virtio_serial_throttle_port(port, true);
95 if (!vcon->watch) {
96 vcon->watch = qemu_chr_fe_add_watch(&vcon->chr,
97 G_IO_OUT|G_IO_HUP,
98 chr_write_unblocked, vcon);
99 }
100 }
101 }
102 return ret;
103}
104
105
106static void set_guest_connected(VirtIOSerialPort *port, int guest_connected)
107{
108 VirtConsole *vcon = VIRTIO_CONSOLE(port);
109 DeviceState *dev = DEVICE(port);
110 VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port);
111
112 if (!k->is_console) {
113 qemu_chr_fe_set_open(&vcon->chr, guest_connected);
114 }
115
116 if (dev->id) {
117 qapi_event_send_vserport_change(dev->id, guest_connected);
118 }
119}
120
121static void guest_writable(VirtIOSerialPort *port)
122{
123 VirtConsole *vcon = VIRTIO_CONSOLE(port);
124
125 qemu_chr_fe_accept_input(&vcon->chr);
126}
127
128
129static int chr_can_read(void *opaque)
130{
131 VirtConsole *vcon = opaque;
132
133 return virtio_serial_guest_ready(VIRTIO_SERIAL_PORT(vcon));
134}
135
136
137static void chr_read(void *opaque, const uint8_t *buf, int size)
138{
139 VirtConsole *vcon = opaque;
140 VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(vcon);
141
142 trace_virtio_console_chr_read(port->id, size);
143 virtio_serial_write(port, buf, size);
144}
145
146static void chr_event(void *opaque, int event)
147{
148 VirtConsole *vcon = opaque;
149 VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(vcon);
150
151 trace_virtio_console_chr_event(port->id, event);
152 switch (event) {
153 case CHR_EVENT_OPENED:
154 virtio_serial_open(port);
155 break;
156 case CHR_EVENT_CLOSED:
157 if (vcon->watch) {
158 g_source_remove(vcon->watch);
159 vcon->watch = 0;
160 }
161 virtio_serial_close(port);
162 break;
163 }
164}
165
166static int chr_be_change(void *opaque)
167{
168 VirtConsole *vcon = opaque;
169 VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(vcon);
170 VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port);
171
172 if (k->is_console) {
173 qemu_chr_fe_set_handlers(&vcon->chr, chr_can_read, chr_read,
174 NULL, chr_be_change, vcon, NULL, true);
175 } else {
176 qemu_chr_fe_set_handlers(&vcon->chr, chr_can_read, chr_read,
177 chr_event, chr_be_change, vcon, NULL, false);
178 }
179
180 if (vcon->watch) {
181 g_source_remove(vcon->watch);
182 vcon->watch = qemu_chr_fe_add_watch(&vcon->chr,
183 G_IO_OUT | G_IO_HUP,
184 chr_write_unblocked, vcon);
185 }
186
187 return 0;
188}
189
190static void virtconsole_enable_backend(VirtIOSerialPort *port, bool enable)
191{
192 VirtConsole *vcon = VIRTIO_CONSOLE(port);
193
194 if (!qemu_chr_fe_backend_connected(&vcon->chr)) {
195 return;
196 }
197
198 if (enable) {
199 VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port);
200
201 qemu_chr_fe_set_handlers(&vcon->chr, chr_can_read, chr_read,
202 k->is_console ? NULL : chr_event,
203 chr_be_change, vcon, NULL, false);
204 } else {
205 qemu_chr_fe_set_handlers(&vcon->chr, NULL, NULL, NULL,
206 NULL, NULL, NULL, false);
207 }
208}
209
210static void virtconsole_realize(DeviceState *dev, Error **errp)
211{
212 VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(dev);
213 VirtConsole *vcon = VIRTIO_CONSOLE(dev);
214 VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(dev);
215
216 if (port->id == 0 && !k->is_console) {
217 error_setg(errp, "Port number 0 on virtio-serial devices reserved "
218 "for virtconsole devices for backward compatibility.");
219 return;
220 }
221
222 if (qemu_chr_fe_backend_connected(&vcon->chr)) {
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232 if (k->is_console) {
233 qemu_chr_fe_set_handlers(&vcon->chr, chr_can_read, chr_read,
234 NULL, chr_be_change,
235 vcon, NULL, true);
236 virtio_serial_open(port);
237 } else {
238 qemu_chr_fe_set_handlers(&vcon->chr, chr_can_read, chr_read,
239 chr_event, chr_be_change,
240 vcon, NULL, false);
241 }
242 }
243}
244
245static void virtconsole_unrealize(DeviceState *dev, Error **errp)
246{
247 VirtConsole *vcon = VIRTIO_CONSOLE(dev);
248
249 if (vcon->watch) {
250 g_source_remove(vcon->watch);
251 }
252}
253
254static void virtconsole_class_init(ObjectClass *klass, void *data)
255{
256 VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass);
257
258 k->is_console = true;
259}
260
261static const TypeInfo virtconsole_info = {
262 .name = "virtconsole",
263 .parent = TYPE_VIRTIO_CONSOLE_SERIAL_PORT,
264 .class_init = virtconsole_class_init,
265};
266
267static Property virtserialport_properties[] = {
268 DEFINE_PROP_CHR("chardev", VirtConsole, chr),
269 DEFINE_PROP_END_OF_LIST(),
270};
271
272static void virtserialport_class_init(ObjectClass *klass, void *data)
273{
274 DeviceClass *dc = DEVICE_CLASS(klass);
275 VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass);
276
277 k->realize = virtconsole_realize;
278 k->unrealize = virtconsole_unrealize;
279 k->have_data = flush_buf;
280 k->set_guest_connected = set_guest_connected;
281 k->enable_backend = virtconsole_enable_backend;
282 k->guest_writable = guest_writable;
283 dc->props = virtserialport_properties;
284}
285
286static const TypeInfo virtserialport_info = {
287 .name = TYPE_VIRTIO_CONSOLE_SERIAL_PORT,
288 .parent = TYPE_VIRTIO_SERIAL_PORT,
289 .instance_size = sizeof(VirtConsole),
290 .class_init = virtserialport_class_init,
291};
292
293static void virtconsole_register_types(void)
294{
295 type_register_static(&virtserialport_info);
296 type_register_static(&virtconsole_info);
297}
298
299type_init(virtconsole_register_types)
300