root / hw / virtio-console.c @ 31d0f80f
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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 | 98b19252 | Amit Shah | #include "virtio-serial.h" |
16 | 98b19252 | Amit Shah | |
17 | 98b19252 | Amit Shah | typedef struct VirtConsole { |
18 | 98b19252 | Amit Shah | VirtIOSerialPort port; |
19 | 98b19252 | Amit Shah | CharDriverState *chr; |
20 | 98b19252 | Amit Shah | } VirtConsole; |
21 | 98b19252 | Amit Shah | |
22 | 98b19252 | Amit Shah | |
23 | 98b19252 | Amit Shah | /* Callback function that's called when the guest sends us data */
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24 | e300ac27 | Amit Shah | static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len) |
25 | 98b19252 | Amit Shah | { |
26 | 98b19252 | Amit Shah | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
27 | 98b19252 | Amit Shah | |
28 | e300ac27 | Amit Shah | return qemu_chr_write(vcon->chr, buf, len);
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29 | 98b19252 | Amit Shah | } |
30 | 98b19252 | Amit Shah | |
31 | 0b6d2266 | Hans de Goede | /* Callback function that's called when the guest opens the port */
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32 | 0b6d2266 | Hans de Goede | static void guest_open(VirtIOSerialPort *port) |
33 | 0b6d2266 | Hans de Goede | { |
34 | 0b6d2266 | Hans de Goede | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
35 | 0b6d2266 | Hans de Goede | |
36 | 0b6d2266 | Hans de Goede | qemu_chr_guest_open(vcon->chr); |
37 | 0b6d2266 | Hans de Goede | } |
38 | 0b6d2266 | Hans de Goede | |
39 | 0b6d2266 | Hans de Goede | /* Callback function that's called when the guest closes the port */
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40 | 0b6d2266 | Hans de Goede | static void guest_close(VirtIOSerialPort *port) |
41 | 0b6d2266 | Hans de Goede | { |
42 | 0b6d2266 | Hans de Goede | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
43 | 0b6d2266 | Hans de Goede | |
44 | 0b6d2266 | Hans de Goede | qemu_chr_guest_close(vcon->chr); |
45 | 0b6d2266 | Hans de Goede | } |
46 | 0b6d2266 | Hans de Goede | |
47 | 98b19252 | Amit Shah | /* Readiness of the guest to accept data on a port */
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48 | 98b19252 | Amit Shah | static int chr_can_read(void *opaque) |
49 | 98b19252 | Amit Shah | { |
50 | 98b19252 | Amit Shah | VirtConsole *vcon = opaque; |
51 | 98b19252 | Amit Shah | |
52 | 98b19252 | Amit Shah | return virtio_serial_guest_ready(&vcon->port);
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53 | 98b19252 | Amit Shah | } |
54 | 98b19252 | Amit Shah | |
55 | 98b19252 | Amit Shah | /* Send data from a char device over to the guest */
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56 | 98b19252 | Amit Shah | static void chr_read(void *opaque, const uint8_t *buf, int size) |
57 | 98b19252 | Amit Shah | { |
58 | 98b19252 | Amit Shah | VirtConsole *vcon = opaque; |
59 | 98b19252 | Amit Shah | |
60 | 98b19252 | Amit Shah | virtio_serial_write(&vcon->port, buf, size); |
61 | 98b19252 | Amit Shah | } |
62 | 98b19252 | Amit Shah | |
63 | 98b19252 | Amit Shah | static void chr_event(void *opaque, int event) |
64 | 98b19252 | Amit Shah | { |
65 | 98b19252 | Amit Shah | VirtConsole *vcon = opaque; |
66 | 98b19252 | Amit Shah | |
67 | 98b19252 | Amit Shah | switch (event) {
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68 | 28eaf465 | Amit Shah | case CHR_EVENT_OPENED:
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69 | 98b19252 | Amit Shah | virtio_serial_open(&vcon->port); |
70 | 98b19252 | Amit Shah | break;
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71 | 98b19252 | Amit Shah | case CHR_EVENT_CLOSED:
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72 | 98b19252 | Amit Shah | virtio_serial_close(&vcon->port); |
73 | 98b19252 | Amit Shah | break;
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74 | 98b19252 | Amit Shah | } |
75 | 98b19252 | Amit Shah | } |
76 | 98b19252 | Amit Shah | |
77 | a43f9c90 | Gerd Hoffmann | static int generic_port_init(VirtConsole *vcon, VirtIOSerialPort *port) |
78 | 98b19252 | Amit Shah | { |
79 | 98b19252 | Amit Shah | if (vcon->chr) {
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80 | 98b19252 | Amit Shah | qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event, |
81 | 98b19252 | Amit Shah | vcon); |
82 | cbe77b61 | Amit Shah | vcon->port.info->have_data = flush_buf; |
83 | 0b6d2266 | Hans de Goede | vcon->port.info->guest_open = guest_open; |
84 | 0b6d2266 | Hans de Goede | vcon->port.info->guest_close = guest_close; |
85 | 98b19252 | Amit Shah | } |
86 | 98b19252 | Amit Shah | return 0; |
87 | 98b19252 | Amit Shah | } |
88 | 98b19252 | Amit Shah | |
89 | cbe77b61 | Amit Shah | /* Virtio Console Ports */
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90 | a43f9c90 | Gerd Hoffmann | static int virtconsole_initfn(VirtIOSerialPort *port) |
91 | cbe77b61 | Amit Shah | { |
92 | cbe77b61 | Amit Shah | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
93 | cbe77b61 | Amit Shah | |
94 | a43f9c90 | Gerd Hoffmann | return generic_port_init(vcon, port);
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95 | cbe77b61 | Amit Shah | } |
96 | cbe77b61 | Amit Shah | |
97 | a43f9c90 | Gerd Hoffmann | static int virtconsole_exitfn(VirtIOSerialPort *port) |
98 | 98b19252 | Amit Shah | { |
99 | 98b19252 | Amit Shah | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
100 | 98b19252 | Amit Shah | |
101 | 98b19252 | Amit Shah | if (vcon->chr) {
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102 | f9a90f18 | Amit Shah | /*
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103 | f9a90f18 | Amit Shah | * Instead of closing the chardev, free it so it can be used
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104 | f9a90f18 | Amit Shah | * for other purposes.
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105 | f9a90f18 | Amit Shah | */
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106 | f9a90f18 | Amit Shah | qemu_chr_add_handlers(vcon->chr, NULL, NULL, NULL, NULL); |
107 | 98b19252 | Amit Shah | } |
108 | 98b19252 | Amit Shah | |
109 | 98b19252 | Amit Shah | return 0; |
110 | 98b19252 | Amit Shah | } |
111 | 98b19252 | Amit Shah | |
112 | 98b19252 | Amit Shah | static VirtIOSerialPortInfo virtconsole_info = {
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113 | 98b19252 | Amit Shah | .qdev.name = "virtconsole",
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114 | 98b19252 | Amit Shah | .qdev.size = sizeof(VirtConsole),
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115 | 2a3d57ce | Markus Armbruster | .is_console = true,
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116 | 98b19252 | Amit Shah | .init = virtconsole_initfn, |
117 | 98b19252 | Amit Shah | .exit = virtconsole_exitfn, |
118 | 98b19252 | Amit Shah | .qdev.props = (Property[]) { |
119 | 055b889f | Amit Shah | DEFINE_PROP_UINT32("nr", VirtConsole, port.id, VIRTIO_CONSOLE_BAD_ID),
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120 | 98b19252 | Amit Shah | DEFINE_PROP_CHR("chardev", VirtConsole, chr),
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121 | 160600fd | Amit Shah | DEFINE_PROP_STRING("name", VirtConsole, port.name),
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122 | 98b19252 | Amit Shah | DEFINE_PROP_END_OF_LIST(), |
123 | 98b19252 | Amit Shah | }, |
124 | 98b19252 | Amit Shah | }; |
125 | 98b19252 | Amit Shah | |
126 | 98b19252 | Amit Shah | static void virtconsole_register(void) |
127 | 98b19252 | Amit Shah | { |
128 | 98b19252 | Amit Shah | virtio_serial_port_qdev_register(&virtconsole_info); |
129 | 98b19252 | Amit Shah | } |
130 | 98b19252 | Amit Shah | device_init(virtconsole_register) |
131 | b60c470b | Amit Shah | |
132 | b60c470b | Amit Shah | /* Generic Virtio Serial Ports */
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133 | a43f9c90 | Gerd Hoffmann | static int virtserialport_initfn(VirtIOSerialPort *port) |
134 | b60c470b | Amit Shah | { |
135 | b60c470b | Amit Shah | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
136 | b60c470b | Amit Shah | |
137 | 0b8b716d | Amit Shah | if (port->id == 0) { |
138 | 0b8b716d | Amit Shah | /*
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139 | 0b8b716d | Amit Shah | * Disallow a generic port at id 0, that's reserved for
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140 | 0b8b716d | Amit Shah | * console ports.
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141 | 0b8b716d | Amit Shah | */
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142 | 0b8b716d | Amit Shah | error_report("Port number 0 on virtio-serial devices reserved for virtconsole devices for backward compatibility.");
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143 | 0b8b716d | Amit Shah | return -1; |
144 | 0b8b716d | Amit Shah | } |
145 | a43f9c90 | Gerd Hoffmann | return generic_port_init(vcon, port);
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146 | b60c470b | Amit Shah | } |
147 | b60c470b | Amit Shah | |
148 | b60c470b | Amit Shah | static VirtIOSerialPortInfo virtserialport_info = {
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149 | b60c470b | Amit Shah | .qdev.name = "virtserialport",
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150 | b60c470b | Amit Shah | .qdev.size = sizeof(VirtConsole),
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151 | b60c470b | Amit Shah | .init = virtserialport_initfn, |
152 | b60c470b | Amit Shah | .exit = virtconsole_exitfn, |
153 | b60c470b | Amit Shah | .qdev.props = (Property[]) { |
154 | 055b889f | Amit Shah | DEFINE_PROP_UINT32("nr", VirtConsole, port.id, VIRTIO_CONSOLE_BAD_ID),
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155 | b60c470b | Amit Shah | DEFINE_PROP_CHR("chardev", VirtConsole, chr),
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156 | b60c470b | Amit Shah | DEFINE_PROP_STRING("name", VirtConsole, port.name),
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157 | b60c470b | Amit Shah | DEFINE_PROP_END_OF_LIST(), |
158 | b60c470b | Amit Shah | }, |
159 | b60c470b | Amit Shah | }; |
160 | b60c470b | Amit Shah | |
161 | b60c470b | Amit Shah | static void virtserialport_register(void) |
162 | b60c470b | Amit Shah | { |
163 | b60c470b | Amit Shah | virtio_serial_port_qdev_register(&virtserialport_info); |
164 | b60c470b | Amit Shah | } |
165 | b60c470b | Amit Shah | device_init(virtserialport_register) |