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, VirtIOSerialDevice *dev)
  61 {
  62     vcon->port.info = dev->info;
  63
  64     if (vcon->chr) {
  65         qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event,
  66                               vcon);
  67         vcon->port.info->have_data = flush_buf;
  68     }
  69     return 0;
  70 }
  71
  72 /* Virtio Console Ports */
  73 static int virtconsole_initfn(VirtIOSerialDevice *dev)
  74 {
  75     VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev);
  76     VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
  77
  78     port->is_console = true;
  79     return generic_port_init(vcon, dev);
  80 }
  81
  82 static int virtconsole_exitfn(VirtIOSerialDevice *dev)
  83 {
  84     VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev);
  85     VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
  86
  87     if (vcon->chr) {
  88         port->info->have_data = NULL;
  89         qemu_chr_close(vcon->chr);
  90     }
  91
  92     return 0;
  93 }
  94
  95 static VirtIOSerialPortInfo virtconsole_info = {
  96     .qdev.name     = "virtconsole",
  97     .qdev.size     = sizeof(VirtConsole),
  98     .init          = virtconsole_initfn,
  99     .exit          = virtconsole_exitfn,
 100     .qdev.props = (Property[]) {
 101         DEFINE_PROP_UINT8("is_console", VirtConsole, port.is_console, 1),
 102         DEFINE_PROP_UINT32("nr", VirtConsole, port.id, VIRTIO_CONSOLE_BAD_ID),
 103         DEFINE_PROP_CHR("chardev", VirtConsole, chr),
 104         DEFINE_PROP_STRING("name", VirtConsole, port.name),
 105         DEFINE_PROP_END_OF_LIST(),
 106     },
 107 };
 108
 109 static void virtconsole_register(void)
 110 {
 111     virtio_serial_port_qdev_register(&virtconsole_info);
 112 }
 113 device_init(virtconsole_register)
 114
 115 /* Generic Virtio Serial Ports */
 116 static int virtserialport_initfn(VirtIOSerialDevice *dev)
 117 {
 118     VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev);
 119     VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
 120
 121     return generic_port_init(vcon, dev);
 122 }
 123
 124 static VirtIOSerialPortInfo virtserialport_info = {
 125     .qdev.name     = "virtserialport",
 126     .qdev.size     = sizeof(VirtConsole),
 127     .init          = virtserialport_initfn,
 128     .exit          = virtconsole_exitfn,
 129     .qdev.props = (Property[]) {
 130         DEFINE_PROP_UINT32("nr", VirtConsole, port.id, VIRTIO_CONSOLE_BAD_ID),
 131         DEFINE_PROP_CHR("chardev", VirtConsole, chr),
 132         DEFINE_PROP_STRING("name", VirtConsole, port.name),
 133         DEFINE_PROP_END_OF_LIST(),
 134     },
 135 };
 136
 137 static void virtserialport_register(void)
 138 {
 139     virtio_serial_port_qdev_register(&virtserialport_info);
 140 }
 141 device_init(virtserialport_register)