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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-event.h"
19
20#define TYPE_VIRTIO_CONSOLE_SERIAL_PORT "virtserialport"
21#define VIRTIO_CONSOLE(obj) \
22 OBJECT_CHECK(VirtConsole, (obj), TYPE_VIRTIO_CONSOLE_SERIAL_PORT)
23
24typedef struct VirtConsole {
25 VirtIOSerialPort parent_obj;
26
27 CharBackend chr;
28 guint watch;
29} VirtConsole;
30
31
32
33
34
35static gboolean chr_write_unblocked(GIOChannel *chan, GIOCondition cond,
36 void *opaque)
37{
38 VirtConsole *vcon = opaque;
39
40 vcon->watch = 0;
41 virtio_serial_throttle_port(VIRTIO_SERIAL_PORT(vcon), false);
42 return FALSE;
43}
44
45
46static ssize_t flush_buf(VirtIOSerialPort *port,
47 const uint8_t *buf, ssize_t len)
48{
49 VirtConsole *vcon = VIRTIO_CONSOLE(port);
50 ssize_t ret;
51
52 if (!qemu_chr_fe_backend_connected(&vcon->chr)) {
53
54 return len;
55 }
56
57 ret = qemu_chr_fe_write(&vcon->chr, buf, len);
58 trace_virtio_console_flush_buf(port->id, len, ret);
59
60 if (ret < len) {
61 VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port);
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67
68
69 if (ret < 0)
70 ret = 0;
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92 if (!k->is_console) {
93 virtio_serial_throttle_port(port, true);
94 if (!vcon->watch) {
95 vcon->watch = qemu_chr_fe_add_watch(&vcon->chr,
96 G_IO_OUT|G_IO_HUP,
97 chr_write_unblocked, vcon);
98 }
99 }
100 }
101 return ret;
102}
103
104
105static void set_guest_connected(VirtIOSerialPort *port, int guest_connected)
106{
107 VirtConsole *vcon = VIRTIO_CONSOLE(port);
108 DeviceState *dev = DEVICE(port);
109 VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port);
110
111 if (!k->is_console) {
112 qemu_chr_fe_set_open(&vcon->chr, guest_connected);
113 }
114
115 if (dev->id) {
116 qapi_event_send_vserport_change(dev->id, guest_connected,
117 &error_abort);
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_realize(DeviceState *dev, Error **errp)
191{
192 VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(dev);
193 VirtConsole *vcon = VIRTIO_CONSOLE(dev);
194 VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(dev);
195
196 if (port->id == 0 && !k->is_console) {
197 error_setg(errp, "Port number 0 on virtio-serial devices reserved "
198 "for virtconsole devices for backward compatibility.");
199 return;
200 }
201
202 if (qemu_chr_fe_backend_connected(&vcon->chr)) {
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212 if (k->is_console) {
213 qemu_chr_fe_set_handlers(&vcon->chr, chr_can_read, chr_read,
214 NULL, chr_be_change,
215 vcon, NULL, true);
216 virtio_serial_open(port);
217 } else {
218 qemu_chr_fe_set_handlers(&vcon->chr, chr_can_read, chr_read,
219 chr_event, chr_be_change,
220 vcon, NULL, false);
221 }
222 }
223}
224
225static void virtconsole_unrealize(DeviceState *dev, Error **errp)
226{
227 VirtConsole *vcon = VIRTIO_CONSOLE(dev);
228
229 if (vcon->watch) {
230 g_source_remove(vcon->watch);
231 }
232}
233
234static void virtconsole_class_init(ObjectClass *klass, void *data)
235{
236 VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass);
237
238 k->is_console = true;
239}
240
241static const TypeInfo virtconsole_info = {
242 .name = "virtconsole",
243 .parent = TYPE_VIRTIO_CONSOLE_SERIAL_PORT,
244 .class_init = virtconsole_class_init,
245};
246
247static Property virtserialport_properties[] = {
248 DEFINE_PROP_CHR("chardev", VirtConsole, chr),
249 DEFINE_PROP_END_OF_LIST(),
250};
251
252static void virtserialport_class_init(ObjectClass *klass, void *data)
253{
254 DeviceClass *dc = DEVICE_CLASS(klass);
255 VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass);
256
257 k->realize = virtconsole_realize;
258 k->unrealize = virtconsole_unrealize;
259 k->have_data = flush_buf;
260 k->set_guest_connected = set_guest_connected;
261 k->guest_writable = guest_writable;
262 dc->props = virtserialport_properties;
263}
264
265static const TypeInfo virtserialport_info = {
266 .name = TYPE_VIRTIO_CONSOLE_SERIAL_PORT,
267 .parent = TYPE_VIRTIO_SERIAL_PORT,
268 .instance_size = sizeof(VirtConsole),
269 .class_init = virtserialport_class_init,
270};
271
272static void virtconsole_register_types(void)
273{
274 type_register_static(&virtserialport_info);
275 type_register_static(&virtconsole_info);
276}
277
278type_init(virtconsole_register_types)
279