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98b19252 AS |
1 | /* |
2 | * Virtio Console and Generic Serial Port Devices | |
3 | * | |
71c092e9 | 4 | * Copyright Red Hat, Inc. 2009, 2010 |
98b19252 AS |
5 | * |
6 | * Authors: | |
7 | * Amit Shah <amit.shah@redhat.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
10 | * the COPYING file in the top-level directory. | |
11 | */ | |
12 | ||
927d4878 | 13 | #include "char/char.h" |
1de7afc9 | 14 | #include "qemu/error-report.h" |
d02e4fa4 | 15 | #include "trace.h" |
83c9f4ca | 16 | #include "hw/virtio-serial.h" |
98b19252 AS |
17 | |
18 | typedef struct VirtConsole { | |
19 | VirtIOSerialPort port; | |
20 | CharDriverState *chr; | |
21 | } VirtConsole; | |
22 | ||
7df4d457 AS |
23 | /* |
24 | * Callback function that's called from chardevs when backend becomes | |
25 | * writable. | |
26 | */ | |
27 | static gboolean chr_write_unblocked(GIOChannel *chan, GIOCondition cond, | |
28 | void *opaque) | |
29 | { | |
30 | VirtConsole *vcon = opaque; | |
31 | ||
32 | virtio_serial_throttle_port(&vcon->port, false); | |
33 | return FALSE; | |
34 | } | |
98b19252 AS |
35 | |
36 | /* Callback function that's called when the guest sends us data */ | |
e300ac27 | 37 | static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len) |
98b19252 AS |
38 | { |
39 | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); | |
d02e4fa4 | 40 | ssize_t ret; |
98b19252 | 41 | |
6640422c AS |
42 | if (!vcon->chr) { |
43 | /* If there's no backend, we can just say we consumed all data. */ | |
44 | return len; | |
45 | } | |
46 | ||
2cc6e0a1 | 47 | ret = qemu_chr_fe_write(vcon->chr, buf, len); |
d02e4fa4 | 48 | trace_virtio_console_flush_buf(port->id, len, ret); |
0219d732 | 49 | |
d6258c93 AS |
50 | if (ret <= 0) { |
51 | VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port); | |
52 | ||
0219d732 AS |
53 | /* |
54 | * Ideally we'd get a better error code than just -1, but | |
55 | * that's what the chardev interface gives us right now. If | |
56 | * we had a finer-grained message, like -EPIPE, we could close | |
d6258c93 | 57 | * this connection. |
0219d732 AS |
58 | */ |
59 | ret = 0; | |
d6258c93 AS |
60 | if (!k->is_console) { |
61 | virtio_serial_throttle_port(port, true); | |
62 | qemu_chr_fe_add_watch(vcon->chr, G_IO_OUT, chr_write_unblocked, | |
63 | vcon); | |
64 | } | |
0219d732 | 65 | } |
d02e4fa4 | 66 | return ret; |
98b19252 AS |
67 | } |
68 | ||
0b6d2266 HG |
69 | /* Callback function that's called when the guest opens the port */ |
70 | static void guest_open(VirtIOSerialPort *port) | |
71 | { | |
72 | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); | |
73 | ||
6640422c AS |
74 | if (!vcon->chr) { |
75 | return; | |
76 | } | |
c9d830ed | 77 | qemu_chr_fe_open(vcon->chr); |
0b6d2266 HG |
78 | } |
79 | ||
80 | /* Callback function that's called when the guest closes the port */ | |
81 | static void guest_close(VirtIOSerialPort *port) | |
82 | { | |
83 | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); | |
84 | ||
6640422c AS |
85 | if (!vcon->chr) { |
86 | return; | |
87 | } | |
2817822d | 88 | qemu_chr_fe_close(vcon->chr); |
0b6d2266 HG |
89 | } |
90 | ||
98b19252 AS |
91 | /* Readiness of the guest to accept data on a port */ |
92 | static int chr_can_read(void *opaque) | |
93 | { | |
94 | VirtConsole *vcon = opaque; | |
95 | ||
96 | return virtio_serial_guest_ready(&vcon->port); | |
97 | } | |
98 | ||
99 | /* Send data from a char device over to the guest */ | |
100 | static void chr_read(void *opaque, const uint8_t *buf, int size) | |
101 | { | |
102 | VirtConsole *vcon = opaque; | |
103 | ||
d02e4fa4 | 104 | trace_virtio_console_chr_read(vcon->port.id, size); |
98b19252 AS |
105 | virtio_serial_write(&vcon->port, buf, size); |
106 | } | |
107 | ||
108 | static void chr_event(void *opaque, int event) | |
109 | { | |
110 | VirtConsole *vcon = opaque; | |
111 | ||
d02e4fa4 | 112 | trace_virtio_console_chr_event(vcon->port.id, event); |
98b19252 | 113 | switch (event) { |
28eaf465 | 114 | case CHR_EVENT_OPENED: |
98b19252 AS |
115 | virtio_serial_open(&vcon->port); |
116 | break; | |
98b19252 AS |
117 | case CHR_EVENT_CLOSED: |
118 | virtio_serial_close(&vcon->port); | |
119 | break; | |
120 | } | |
121 | } | |
122 | ||
7edfe652 | 123 | static int virtconsole_initfn(VirtIOSerialPort *port) |
98b19252 | 124 | { |
7edfe652 | 125 | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
f82e35e3 | 126 | VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
a15bb0d6 | 127 | |
f82e35e3 | 128 | if (port->id == 0 && !k->is_console) { |
7edfe652 MA |
129 | error_report("Port number 0 on virtio-serial devices reserved for virtconsole devices for backward compatibility."); |
130 | return -1; | |
131 | } | |
132 | ||
98b19252 AS |
133 | if (vcon->chr) { |
134 | qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event, | |
135 | vcon); | |
98b19252 | 136 | } |
cbe77b61 | 137 | |
7edfe652 | 138 | return 0; |
cbe77b61 AS |
139 | } |
140 | ||
f82e35e3 AL |
141 | static Property virtconsole_properties[] = { |
142 | DEFINE_PROP_CHR("chardev", VirtConsole, chr), | |
143 | DEFINE_PROP_END_OF_LIST(), | |
144 | }; | |
145 | ||
146 | static void virtconsole_class_init(ObjectClass *klass, void *data) | |
147 | { | |
39bffca2 | 148 | DeviceClass *dc = DEVICE_CLASS(klass); |
f82e35e3 AL |
149 | VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass); |
150 | ||
151 | k->is_console = true; | |
152 | k->init = virtconsole_initfn; | |
153 | k->have_data = flush_buf; | |
154 | k->guest_open = guest_open; | |
155 | k->guest_close = guest_close; | |
39bffca2 | 156 | dc->props = virtconsole_properties; |
f82e35e3 AL |
157 | } |
158 | ||
8c43a6f0 | 159 | static const TypeInfo virtconsole_info = { |
39bffca2 AL |
160 | .name = "virtconsole", |
161 | .parent = TYPE_VIRTIO_SERIAL_PORT, | |
162 | .instance_size = sizeof(VirtConsole), | |
163 | .class_init = virtconsole_class_init, | |
98b19252 AS |
164 | }; |
165 | ||
f82e35e3 AL |
166 | static Property virtserialport_properties[] = { |
167 | DEFINE_PROP_CHR("chardev", VirtConsole, chr), | |
168 | DEFINE_PROP_END_OF_LIST(), | |
169 | }; | |
170 | ||
171 | static void virtserialport_class_init(ObjectClass *klass, void *data) | |
172 | { | |
39bffca2 | 173 | DeviceClass *dc = DEVICE_CLASS(klass); |
f82e35e3 AL |
174 | VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass); |
175 | ||
176 | k->init = virtconsole_initfn; | |
177 | k->have_data = flush_buf; | |
178 | k->guest_open = guest_open; | |
179 | k->guest_close = guest_close; | |
39bffca2 | 180 | dc->props = virtserialport_properties; |
f82e35e3 AL |
181 | } |
182 | ||
8c43a6f0 | 183 | static const TypeInfo virtserialport_info = { |
39bffca2 AL |
184 | .name = "virtserialport", |
185 | .parent = TYPE_VIRTIO_SERIAL_PORT, | |
186 | .instance_size = sizeof(VirtConsole), | |
187 | .class_init = virtserialport_class_init, | |
b60c470b AS |
188 | }; |
189 | ||
83f7d43a | 190 | static void virtconsole_register_types(void) |
b60c470b | 191 | { |
83f7d43a | 192 | type_register_static(&virtconsole_info); |
39bffca2 | 193 | type_register_static(&virtserialport_info); |
b60c470b | 194 | } |
83f7d43a AF |
195 | |
196 | type_init(virtconsole_register_types) |