hw/virtio-console.c

   1 /*
   2  * Virtio Console and Generic Serial Port Devices
   3  *
   4  * Copyright Red Hat, Inc. 2009
   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 size_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len)
  24 {
  25     VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
  26     ssize_t ret;
  27
  28     ret = qemu_chr_write(vcon->chr, buf, len);
  29
  30     return ret < 0 ? 0 : ret;
  31 }
  32
  33 /* Readiness of the guest to accept data on a port */
  34 static int chr_can_read(void *opaque)
  35 {
  36     VirtConsole *vcon = opaque;
  37
  38     return virtio_serial_guest_ready(&vcon->port);
  39 }
  40
  41 /* Send data from a char device over to the guest */
  42 static void chr_read(void *opaque, const uint8_t *buf, int size)
  43 {
  44     VirtConsole *vcon = opaque;
  45
  46     virtio_serial_write(&vcon->port, buf, size);
  47 }
  48
  49 static void chr_event(void *opaque, int event)
  50 {
  51     VirtConsole *vcon = opaque;
  52
  53     switch (event) {
  54     case CHR_EVENT_OPENED: {
  55         virtio_serial_open(&vcon->port);
  56         break;
  57     }
  58     case CHR_EVENT_CLOSED:
  59         virtio_serial_close(&vcon->port);
  60         break;
  61     }
  62 }
  63
  64 /* Virtio Console Ports */
  65 static int virtconsole_initfn(VirtIOSerialDevice *dev)
  66 {
  67     VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev);
  68     VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
  69
  70     port->info = dev->info;
  71
  72     port->is_console = true;
  73
  74     if (vcon->chr) {
  75         qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event,
  76                               vcon);
  77         port->info->have_data = flush_buf;
  78     }
  79     return 0;
  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_CHR("chardev", VirtConsole, chr),
 103         DEFINE_PROP_STRING("name", VirtConsole, port.name),
 104         DEFINE_PROP_END_OF_LIST(),
 105     },
 106 };
 107
 108 static void virtconsole_register(void)
 109 {
 110     virtio_serial_port_qdev_register(&virtconsole_info);
 111 }
 112 device_init(virtconsole_register)
 113
 114 /* Generic Virtio Serial Ports */
 115 static int virtserialport_initfn(VirtIOSerialDevice *dev)
 116 {
 117     VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev);
 118     VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
 119
 120     port->info = dev->info;
 121
 122     if (vcon->chr) {
 123         qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event,
 124                               vcon);
 125         port->info->have_data = flush_buf;
 126     }
 127     return 0;
 128 }
 129
 130 static VirtIOSerialPortInfo virtserialport_info = {
 131     .qdev.name     = "virtserialport",
 132     .qdev.size     = sizeof(VirtConsole),
 133     .init          = virtserialport_initfn,
 134     .exit          = virtconsole_exitfn,
 135     .qdev.props = (Property[]) {
 136         DEFINE_PROP_CHR("chardev", VirtConsole, chr),
 137         DEFINE_PROP_STRING("name", VirtConsole, port.name),
 138         DEFINE_PROP_END_OF_LIST(),
 139     },
 140 };
 141
 142 static void virtserialport_register(void)
 143 {
 144     virtio_serial_port_qdev_register(&virtserialport_info);
 145 }
 146 device_init(virtserialport_register)