root / hw / virtio-console.c @ 0cdd3d14
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1 | 98b19252 | Amit Shah | /*
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2 | 98b19252 | Amit Shah | * Virtio Console and Generic Serial Port Devices
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3 | 98b19252 | Amit Shah | *
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4 | 71c092e9 | Amit Shah | * Copyright Red Hat, Inc. 2009, 2010
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5 | 98b19252 | Amit Shah | *
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6 | 98b19252 | Amit Shah | * Authors:
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7 | 98b19252 | Amit Shah | * Amit Shah <amit.shah@redhat.com>
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8 | 98b19252 | Amit Shah | *
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9 | 98b19252 | Amit Shah | * This work is licensed under the terms of the GNU GPL, version 2. See
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10 | 98b19252 | Amit Shah | * the COPYING file in the top-level directory.
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11 | 98b19252 | Amit Shah | */
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12 | 98b19252 | Amit Shah | |
13 | 98b19252 | Amit Shah | #include "qemu-char.h" |
14 | 0b8b716d | Amit Shah | #include "qemu-error.h" |
15 | d02e4fa4 | Amit Shah | #include "trace.h" |
16 | 98b19252 | Amit Shah | #include "virtio-serial.h" |
17 | 98b19252 | Amit Shah | |
18 | 98b19252 | Amit Shah | typedef struct VirtConsole { |
19 | 98b19252 | Amit Shah | VirtIOSerialPort port; |
20 | 98b19252 | Amit Shah | CharDriverState *chr; |
21 | 98b19252 | Amit Shah | } VirtConsole; |
22 | 98b19252 | Amit Shah | |
23 | 98b19252 | Amit Shah | |
24 | 98b19252 | Amit Shah | /* Callback function that's called when the guest sends us data */
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25 | e300ac27 | Amit Shah | static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len) |
26 | 98b19252 | Amit Shah | { |
27 | 98b19252 | Amit Shah | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
28 | d02e4fa4 | Amit Shah | ssize_t ret; |
29 | 98b19252 | Amit Shah | |
30 | 6640422c | Amit Shah | if (!vcon->chr) {
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31 | 6640422c | Amit Shah | /* If there's no backend, we can just say we consumed all data. */
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32 | 6640422c | Amit Shah | return len;
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33 | 6640422c | Amit Shah | } |
34 | 6640422c | Amit Shah | |
35 | 2cc6e0a1 | Anthony Liguori | ret = qemu_chr_fe_write(vcon->chr, buf, len); |
36 | d02e4fa4 | Amit Shah | trace_virtio_console_flush_buf(port->id, len, ret); |
37 | 0219d732 | Amit Shah | |
38 | 0219d732 | Amit Shah | if (ret < 0) { |
39 | 0219d732 | Amit Shah | /*
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40 | 0219d732 | Amit Shah | * Ideally we'd get a better error code than just -1, but
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41 | 0219d732 | Amit Shah | * that's what the chardev interface gives us right now. If
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42 | 0219d732 | Amit Shah | * we had a finer-grained message, like -EPIPE, we could close
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43 | 0219d732 | Amit Shah | * this connection. Absent such error messages, the most we
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44 | 0219d732 | Amit Shah | * can do is to return 0 here.
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45 | 0219d732 | Amit Shah | *
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46 | 0219d732 | Amit Shah | * This will prevent stray -1 values to go to
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47 | 0219d732 | Amit Shah | * virtio-serial-bus.c and cause abort()s in
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48 | 0219d732 | Amit Shah | * do_flush_queued_data().
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49 | 0219d732 | Amit Shah | */
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50 | 0219d732 | Amit Shah | ret = 0;
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51 | 0219d732 | Amit Shah | } |
52 | d02e4fa4 | Amit Shah | return ret;
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53 | 98b19252 | Amit Shah | } |
54 | 98b19252 | Amit Shah | |
55 | 0b6d2266 | Hans de Goede | /* Callback function that's called when the guest opens the port */
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56 | 0b6d2266 | Hans de Goede | static void guest_open(VirtIOSerialPort *port) |
57 | 0b6d2266 | Hans de Goede | { |
58 | 0b6d2266 | Hans de Goede | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
59 | 0b6d2266 | Hans de Goede | |
60 | 6640422c | Amit Shah | if (!vcon->chr) {
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61 | 6640422c | Amit Shah | return;
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62 | 6640422c | Amit Shah | } |
63 | c9d830ed | Anthony Liguori | qemu_chr_fe_open(vcon->chr); |
64 | 0b6d2266 | Hans de Goede | } |
65 | 0b6d2266 | Hans de Goede | |
66 | 0b6d2266 | Hans de Goede | /* Callback function that's called when the guest closes the port */
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67 | 0b6d2266 | Hans de Goede | static void guest_close(VirtIOSerialPort *port) |
68 | 0b6d2266 | Hans de Goede | { |
69 | 0b6d2266 | Hans de Goede | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
70 | 0b6d2266 | Hans de Goede | |
71 | 6640422c | Amit Shah | if (!vcon->chr) {
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72 | 6640422c | Amit Shah | return;
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73 | 6640422c | Amit Shah | } |
74 | 2817822d | Anthony Liguori | qemu_chr_fe_close(vcon->chr); |
75 | 0b6d2266 | Hans de Goede | } |
76 | 0b6d2266 | Hans de Goede | |
77 | 98b19252 | Amit Shah | /* Readiness of the guest to accept data on a port */
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78 | 98b19252 | Amit Shah | static int chr_can_read(void *opaque) |
79 | 98b19252 | Amit Shah | { |
80 | 98b19252 | Amit Shah | VirtConsole *vcon = opaque; |
81 | 98b19252 | Amit Shah | |
82 | 98b19252 | Amit Shah | return virtio_serial_guest_ready(&vcon->port);
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83 | 98b19252 | Amit Shah | } |
84 | 98b19252 | Amit Shah | |
85 | 98b19252 | Amit Shah | /* Send data from a char device over to the guest */
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86 | 98b19252 | Amit Shah | static void chr_read(void *opaque, const uint8_t *buf, int size) |
87 | 98b19252 | Amit Shah | { |
88 | 98b19252 | Amit Shah | VirtConsole *vcon = opaque; |
89 | 98b19252 | Amit Shah | |
90 | d02e4fa4 | Amit Shah | trace_virtio_console_chr_read(vcon->port.id, size); |
91 | 98b19252 | Amit Shah | virtio_serial_write(&vcon->port, buf, size); |
92 | 98b19252 | Amit Shah | } |
93 | 98b19252 | Amit Shah | |
94 | 98b19252 | Amit Shah | static void chr_event(void *opaque, int event) |
95 | 98b19252 | Amit Shah | { |
96 | 98b19252 | Amit Shah | VirtConsole *vcon = opaque; |
97 | 98b19252 | Amit Shah | |
98 | d02e4fa4 | Amit Shah | trace_virtio_console_chr_event(vcon->port.id, event); |
99 | 98b19252 | Amit Shah | switch (event) {
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100 | 28eaf465 | Amit Shah | case CHR_EVENT_OPENED:
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101 | 98b19252 | Amit Shah | virtio_serial_open(&vcon->port); |
102 | 98b19252 | Amit Shah | break;
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103 | 98b19252 | Amit Shah | case CHR_EVENT_CLOSED:
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104 | 98b19252 | Amit Shah | virtio_serial_close(&vcon->port); |
105 | 98b19252 | Amit Shah | break;
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106 | 98b19252 | Amit Shah | } |
107 | 98b19252 | Amit Shah | } |
108 | 98b19252 | Amit Shah | |
109 | 7edfe652 | Markus Armbruster | static int virtconsole_initfn(VirtIOSerialPort *port) |
110 | 98b19252 | Amit Shah | { |
111 | 7edfe652 | Markus Armbruster | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
112 | f82e35e3 | Anthony Liguori | VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
113 | a15bb0d6 | Markus Armbruster | |
114 | f82e35e3 | Anthony Liguori | if (port->id == 0 && !k->is_console) { |
115 | 7edfe652 | Markus Armbruster | error_report("Port number 0 on virtio-serial devices reserved for virtconsole devices for backward compatibility.");
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116 | 7edfe652 | Markus Armbruster | return -1; |
117 | 7edfe652 | Markus Armbruster | } |
118 | 7edfe652 | Markus Armbruster | |
119 | 98b19252 | Amit Shah | if (vcon->chr) {
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120 | 98b19252 | Amit Shah | qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event, |
121 | 98b19252 | Amit Shah | vcon); |
122 | 98b19252 | Amit Shah | } |
123 | cbe77b61 | Amit Shah | |
124 | 7edfe652 | Markus Armbruster | return 0; |
125 | cbe77b61 | Amit Shah | } |
126 | cbe77b61 | Amit Shah | |
127 | f82e35e3 | Anthony Liguori | static Property virtconsole_properties[] = {
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128 | f82e35e3 | Anthony Liguori | DEFINE_PROP_CHR("chardev", VirtConsole, chr),
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129 | f82e35e3 | Anthony Liguori | DEFINE_PROP_END_OF_LIST(), |
130 | f82e35e3 | Anthony Liguori | }; |
131 | f82e35e3 | Anthony Liguori | |
132 | f82e35e3 | Anthony Liguori | static void virtconsole_class_init(ObjectClass *klass, void *data) |
133 | f82e35e3 | Anthony Liguori | { |
134 | 39bffca2 | Anthony Liguori | DeviceClass *dc = DEVICE_CLASS(klass); |
135 | f82e35e3 | Anthony Liguori | VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass); |
136 | f82e35e3 | Anthony Liguori | |
137 | f82e35e3 | Anthony Liguori | k->is_console = true;
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138 | f82e35e3 | Anthony Liguori | k->init = virtconsole_initfn; |
139 | f82e35e3 | Anthony Liguori | k->have_data = flush_buf; |
140 | f82e35e3 | Anthony Liguori | k->guest_open = guest_open; |
141 | f82e35e3 | Anthony Liguori | k->guest_close = guest_close; |
142 | 39bffca2 | Anthony Liguori | dc->props = virtconsole_properties; |
143 | f82e35e3 | Anthony Liguori | } |
144 | f82e35e3 | Anthony Liguori | |
145 | 39bffca2 | Anthony Liguori | static TypeInfo virtconsole_info = {
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146 | 39bffca2 | Anthony Liguori | .name = "virtconsole",
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147 | 39bffca2 | Anthony Liguori | .parent = TYPE_VIRTIO_SERIAL_PORT, |
148 | 39bffca2 | Anthony Liguori | .instance_size = sizeof(VirtConsole),
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149 | 39bffca2 | Anthony Liguori | .class_init = virtconsole_class_init, |
150 | 98b19252 | Amit Shah | }; |
151 | 98b19252 | Amit Shah | |
152 | f82e35e3 | Anthony Liguori | static Property virtserialport_properties[] = {
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153 | f82e35e3 | Anthony Liguori | DEFINE_PROP_CHR("chardev", VirtConsole, chr),
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154 | f82e35e3 | Anthony Liguori | DEFINE_PROP_END_OF_LIST(), |
155 | f82e35e3 | Anthony Liguori | }; |
156 | f82e35e3 | Anthony Liguori | |
157 | f82e35e3 | Anthony Liguori | static void virtserialport_class_init(ObjectClass *klass, void *data) |
158 | f82e35e3 | Anthony Liguori | { |
159 | 39bffca2 | Anthony Liguori | DeviceClass *dc = DEVICE_CLASS(klass); |
160 | f82e35e3 | Anthony Liguori | VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass); |
161 | f82e35e3 | Anthony Liguori | |
162 | f82e35e3 | Anthony Liguori | k->init = virtconsole_initfn; |
163 | f82e35e3 | Anthony Liguori | k->have_data = flush_buf; |
164 | f82e35e3 | Anthony Liguori | k->guest_open = guest_open; |
165 | f82e35e3 | Anthony Liguori | k->guest_close = guest_close; |
166 | 39bffca2 | Anthony Liguori | dc->props = virtserialport_properties; |
167 | f82e35e3 | Anthony Liguori | } |
168 | f82e35e3 | Anthony Liguori | |
169 | 39bffca2 | Anthony Liguori | static TypeInfo virtserialport_info = {
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170 | 39bffca2 | Anthony Liguori | .name = "virtserialport",
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171 | 39bffca2 | Anthony Liguori | .parent = TYPE_VIRTIO_SERIAL_PORT, |
172 | 39bffca2 | Anthony Liguori | .instance_size = sizeof(VirtConsole),
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173 | 39bffca2 | Anthony Liguori | .class_init = virtserialport_class_init, |
174 | b60c470b | Amit Shah | }; |
175 | b60c470b | Amit Shah | |
176 | 83f7d43a | Andreas Färber | static void virtconsole_register_types(void) |
177 | b60c470b | Amit Shah | { |
178 | 83f7d43a | Andreas Färber | type_register_static(&virtconsole_info); |
179 | 39bffca2 | Anthony Liguori | type_register_static(&virtserialport_info); |
180 | b60c470b | Amit Shah | } |
181 | 83f7d43a | Andreas Färber | |
182 | 83f7d43a | Andreas Färber | type_init(virtconsole_register_types) |