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1 | /* | |
2 | * Virtio Console and Generic Serial Port Devices | |
3 | * | |
4 | * Copyright Red Hat, Inc. 2009, 2010 | |
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 | ||
13 | #include "qemu-char.h" | |
14 | #include "qemu-error.h" | |
15 | #include "virtio-serial.h" | |
16 | ||
17 | typedef struct VirtConsole { | |
18 | VirtIOSerialPort port; | |
19 | CharDriverState *chr; | |
20 | } VirtConsole; | |
21 | ||
22 | ||
23 | /* Callback function that's called when the guest sends us data */ | |
24 | static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len) | |
25 | { | |
26 | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); | |
27 | ||
28 | return qemu_chr_write(vcon->chr, buf, len); | |
29 | } | |
30 | ||
31 | /* Callback function that's called when the guest opens the port */ | |
32 | static void guest_open(VirtIOSerialPort *port) | |
33 | { | |
34 | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); | |
35 | ||
36 | qemu_chr_guest_open(vcon->chr); | |
37 | } | |
38 | ||
39 | /* Callback function that's called when the guest closes the port */ | |
40 | static void guest_close(VirtIOSerialPort *port) | |
41 | { | |
42 | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); | |
43 | ||
44 | qemu_chr_guest_close(vcon->chr); | |
45 | } | |
46 | ||
47 | /* Readiness of the guest to accept data on a port */ | |
48 | static int chr_can_read(void *opaque) | |
49 | { | |
50 | VirtConsole *vcon = opaque; | |
51 | ||
52 | return virtio_serial_guest_ready(&vcon->port); | |
53 | } | |
54 | ||
55 | /* Send data from a char device over to the guest */ | |
56 | static void chr_read(void *opaque, const uint8_t *buf, int size) | |
57 | { | |
58 | VirtConsole *vcon = opaque; | |
59 | ||
60 | virtio_serial_write(&vcon->port, buf, size); | |
61 | } | |
62 | ||
63 | static void chr_event(void *opaque, int event) | |
64 | { | |
65 | VirtConsole *vcon = opaque; | |
66 | ||
67 | switch (event) { | |
68 | case CHR_EVENT_OPENED: | |
69 | virtio_serial_open(&vcon->port); | |
70 | break; | |
71 | case CHR_EVENT_CLOSED: | |
72 | virtio_serial_close(&vcon->port); | |
73 | break; | |
74 | } | |
75 | } | |
76 | ||
77 | static int virtconsole_initfn(VirtIOSerialPort *port) | |
78 | { | |
79 | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); | |
80 | VirtIOSerialPortInfo *info = DO_UPCAST(VirtIOSerialPortInfo, qdev, | |
81 | vcon->port.dev.info); | |
82 | ||
83 | if (port->id == 0 && !info->is_console) { | |
84 | error_report("Port number 0 on virtio-serial devices reserved for virtconsole devices for backward compatibility."); | |
85 | return -1; | |
86 | } | |
87 | ||
88 | if (vcon->chr) { | |
89 | qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event, | |
90 | vcon); | |
91 | info->have_data = flush_buf; | |
92 | info->guest_open = guest_open; | |
93 | info->guest_close = guest_close; | |
94 | } | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | static int virtconsole_exitfn(VirtIOSerialPort *port) | |
100 | { | |
101 | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); | |
102 | ||
103 | if (vcon->chr) { | |
104 | /* | |
105 | * Instead of closing the chardev, free it so it can be used | |
106 | * for other purposes. | |
107 | */ | |
108 | qemu_chr_add_handlers(vcon->chr, NULL, NULL, NULL, NULL); | |
109 | } | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
114 | static VirtIOSerialPortInfo virtconsole_info = { | |
115 | .qdev.name = "virtconsole", | |
116 | .qdev.size = sizeof(VirtConsole), | |
117 | .is_console = true, | |
118 | .init = virtconsole_initfn, | |
119 | .exit = virtconsole_exitfn, | |
120 | .qdev.props = (Property[]) { | |
121 | DEFINE_PROP_UINT32("nr", VirtConsole, port.id, VIRTIO_CONSOLE_BAD_ID), | |
122 | DEFINE_PROP_CHR("chardev", VirtConsole, chr), | |
123 | DEFINE_PROP_STRING("name", VirtConsole, port.name), | |
124 | DEFINE_PROP_END_OF_LIST(), | |
125 | }, | |
126 | }; | |
127 | ||
128 | static void virtconsole_register(void) | |
129 | { | |
130 | virtio_serial_port_qdev_register(&virtconsole_info); | |
131 | } | |
132 | device_init(virtconsole_register) | |
133 | ||
134 | static VirtIOSerialPortInfo virtserialport_info = { | |
135 | .qdev.name = "virtserialport", | |
136 | .qdev.size = sizeof(VirtConsole), | |
137 | .init = virtconsole_initfn, | |
138 | .exit = virtconsole_exitfn, | |
139 | .qdev.props = (Property[]) { | |
140 | DEFINE_PROP_UINT32("nr", VirtConsole, port.id, VIRTIO_CONSOLE_BAD_ID), | |
141 | DEFINE_PROP_CHR("chardev", VirtConsole, chr), | |
142 | DEFINE_PROP_STRING("name", VirtConsole, port.name), | |
143 | DEFINE_PROP_END_OF_LIST(), | |
144 | }, | |
145 | }; | |
146 | ||
147 | static void virtserialport_register(void) | |
148 | { | |
149 | virtio_serial_port_qdev_register(&virtserialport_info); | |
150 | } | |
151 | device_init(virtserialport_register) |