hw/virtio-console.c

   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 "virtio-serial.h"
  15
  16 typedef struct VirtConsole {
  17     VirtIOSerialPort port;
  18     CharDriverState *chr;
  19 } VirtConsole;
  20
  21
  22 /* Callback function that's called when the guest sends us data */
  23 static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len)
  24 {
  25     VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
  26
  27     return qemu_chr_write(vcon->chr, buf, len);
  28 }
  29
  30 /* Readiness of the guest to accept data on a port */
  31 static int chr_can_read(void *opaque)
  32 {
  33     VirtConsole *vcon = opaque;
  34
  35     return virtio_serial_guest_ready(&vcon->port);
  36 }
  37
  38 /* Send data from a char device over to the guest */
  39 static void chr_read(void *opaque, const uint8_t *buf, int size)
  40 {
  41     VirtConsole *vcon = opaque;
  42
  43     virtio_serial_write(&vcon->port, buf, size);
  44 }
  45
  46 static void chr_event(void *opaque, int event)
  47 {
  48     VirtConsole *vcon = opaque;
  49
  50     switch (event) {
  51     case CHR_EVENT_OPENED:
  52         virtio_serial_open(&vcon->port);
  53         break;
  54     case CHR_EVENT_CLOSED:
  55         virtio_serial_close(&vcon->port);
  56         break;
  57     }
  58 }
  59
  60 static int generic_port_init(VirtConsole *vcon, VirtIOSerialPort *port)
  61 {
  62     if (vcon->chr) {
  63         qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event,
  64                               vcon);
  65         vcon->port.info->have_data = flush_buf;
  66     }
  67     return 0;
  68 }
  69
  70 /* Virtio Console Ports */
  71 static int virtconsole_initfn(VirtIOSerialPort *port)
  72 {
  73     VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
  74
  75     port->is_console = true;
  76     return generic_port_init(vcon, port);
  77 }
  78
  79 static int virtconsole_exitfn(VirtIOSerialPort *port)
  80 {
  81     VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
  82
  83     if (vcon->chr) {
  84         port->info->have_data = NULL;
  85         qemu_chr_close(vcon->chr);
  86     }
  87
  88     return 0;
  89 }
  90
  91 static VirtIOSerialPortInfo virtconsole_info = {
  92     .qdev.name     = "virtconsole",
  93     .qdev.size     = sizeof(VirtConsole),
  94     .init          = virtconsole_initfn,
  95     .exit          = virtconsole_exitfn,
  96     .qdev.props = (Property[]) {
  97         DEFINE_PROP_UINT8("is_console", VirtConsole, port.is_console, 1),
  98         DEFINE_PROP_UINT32("nr", VirtConsole, port.id, VIRTIO_CONSOLE_BAD_ID),
  99         DEFINE_PROP_CHR("chardev", VirtConsole, chr),
 100         DEFINE_PROP_STRING("name", VirtConsole, port.name),
 101         DEFINE_PROP_END_OF_LIST(),
 102     },
 103 };
 104
 105 static void virtconsole_register(void)
 106 {
 107     virtio_serial_port_qdev_register(&virtconsole_info);
 108 }
 109 device_init(virtconsole_register)
 110
 111 /* Generic Virtio Serial Ports */
 112 static int virtserialport_initfn(VirtIOSerialPort *port)
 113 {
 114     VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
 115
 116     return generic_port_init(vcon, port);
 117 }
 118
 119 static VirtIOSerialPortInfo virtserialport_info = {
 120     .qdev.name     = "virtserialport",
 121     .qdev.size     = sizeof(VirtConsole),
 122     .init          = virtserialport_initfn,
 123     .exit          = virtconsole_exitfn,
 124     .qdev.props = (Property[]) {
 125         DEFINE_PROP_UINT32("nr", VirtConsole, port.id, VIRTIO_CONSOLE_BAD_ID),
 126         DEFINE_PROP_CHR("chardev", VirtConsole, chr),
 127         DEFINE_PROP_STRING("name", VirtConsole, port.name),
 128         DEFINE_PROP_END_OF_LIST(),
 129     },
 130 };
 131
 132 static void virtserialport_register(void)
 133 {
 134     virtio_serial_port_qdev_register(&virtserialport_info);
 135 }
 136 device_init(virtserialport_register)