qemu/hw/virtio-console.c
Anthony Liguori 6e72a00f90 Merge remote-tracking branch 'bonzini/hw-dirs' into staging
* bonzini/hw-dirs:
  sh: move files referencing CPU to hw/sh4/
  ppc: move more files to hw/ppc
  ppc: move files referencing CPU to hw/ppc/
  m68k: move files referencing CPU to hw/m68k/
  i386: move files referencing CPU to hw/i386/
  arm: move files referencing CPU to hw/arm/
  hw: move boards and other isolated files to hw/ARCH
  ppc: express FDT dependency of pSeries and e500 boards via default-configs/
  build: always link device_tree.o into emulators if libfdt available
  hw: include hw header files with full paths
  ppc: do not use ../ in include files
  vt82c686: vt82c686 is not a PCI host bridge
  virtio-9p: remove PCI dependencies from hw/9pfs/
  virtio-9p: use CONFIG_VIRTFS, not CONFIG_LINUX
  hw: move device-hotplug.o to toplevel, compile it once
  hw: move qdev-monitor.o to toplevel directory
  hw: move fifo.[ch] to libqemuutil
  hw: move char backends to backends/

Conflicts:
	backends/baum.c
	backends/msmouse.c
	hw/a15mpcore.c
	hw/arm/Makefile.objs
	hw/arm/pic_cpu.c
	hw/dataplane/event-poll.c
	hw/dataplane/virtio-blk.c
	include/char/baum.h
	include/char/msmouse.h
	qemu-char.c
	vl.c

Resolve conflicts caused by header movements.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-03-10 19:56:35 -05:00

197 lines
5.2 KiB
C

/*
* Virtio Console and Generic Serial Port Devices
*
* Copyright Red Hat, Inc. 2009, 2010
*
* Authors:
* Amit Shah <amit.shah@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*/
#include "char/char.h"
#include "qemu/error-report.h"
#include "trace.h"
#include "hw/virtio-serial.h"
typedef struct VirtConsole {
VirtIOSerialPort port;
CharDriverState *chr;
} VirtConsole;
/*
* Callback function that's called from chardevs when backend becomes
* writable.
*/
static gboolean chr_write_unblocked(GIOChannel *chan, GIOCondition cond,
void *opaque)
{
VirtConsole *vcon = opaque;
virtio_serial_throttle_port(&vcon->port, false);
return FALSE;
}
/* Callback function that's called when the guest sends us data */
static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len)
{
VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
ssize_t ret;
if (!vcon->chr) {
/* If there's no backend, we can just say we consumed all data. */
return len;
}
ret = qemu_chr_fe_write(vcon->chr, buf, len);
trace_virtio_console_flush_buf(port->id, len, ret);
if (ret <= 0) {
VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port);
/*
* Ideally we'd get a better error code than just -1, but
* that's what the chardev interface gives us right now. If
* we had a finer-grained message, like -EPIPE, we could close
* this connection.
*/
ret = 0;
if (!k->is_console) {
virtio_serial_throttle_port(port, true);
qemu_chr_fe_add_watch(vcon->chr, G_IO_OUT, chr_write_unblocked,
vcon);
}
}
return ret;
}
/* Callback function that's called when the guest opens the port */
static void guest_open(VirtIOSerialPort *port)
{
VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
if (!vcon->chr) {
return;
}
qemu_chr_fe_open(vcon->chr);
}
/* Callback function that's called when the guest closes the port */
static void guest_close(VirtIOSerialPort *port)
{
VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
if (!vcon->chr) {
return;
}
qemu_chr_fe_close(vcon->chr);
}
/* Readiness of the guest to accept data on a port */
static int chr_can_read(void *opaque)
{
VirtConsole *vcon = opaque;
return virtio_serial_guest_ready(&vcon->port);
}
/* Send data from a char device over to the guest */
static void chr_read(void *opaque, const uint8_t *buf, int size)
{
VirtConsole *vcon = opaque;
trace_virtio_console_chr_read(vcon->port.id, size);
virtio_serial_write(&vcon->port, buf, size);
}
static void chr_event(void *opaque, int event)
{
VirtConsole *vcon = opaque;
trace_virtio_console_chr_event(vcon->port.id, event);
switch (event) {
case CHR_EVENT_OPENED:
virtio_serial_open(&vcon->port);
break;
case CHR_EVENT_CLOSED:
virtio_serial_close(&vcon->port);
break;
}
}
static int virtconsole_initfn(VirtIOSerialPort *port)
{
VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port);
if (port->id == 0 && !k->is_console) {
error_report("Port number 0 on virtio-serial devices reserved for virtconsole devices for backward compatibility.");
return -1;
}
if (vcon->chr) {
qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event,
vcon);
}
return 0;
}
static Property virtconsole_properties[] = {
DEFINE_PROP_CHR("chardev", VirtConsole, chr),
DEFINE_PROP_END_OF_LIST(),
};
static void virtconsole_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass);
k->is_console = true;
k->init = virtconsole_initfn;
k->have_data = flush_buf;
k->guest_open = guest_open;
k->guest_close = guest_close;
dc->props = virtconsole_properties;
}
static const TypeInfo virtconsole_info = {
.name = "virtconsole",
.parent = TYPE_VIRTIO_SERIAL_PORT,
.instance_size = sizeof(VirtConsole),
.class_init = virtconsole_class_init,
};
static Property virtserialport_properties[] = {
DEFINE_PROP_CHR("chardev", VirtConsole, chr),
DEFINE_PROP_END_OF_LIST(),
};
static void virtserialport_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass);
k->init = virtconsole_initfn;
k->have_data = flush_buf;
k->guest_open = guest_open;
k->guest_close = guest_close;
dc->props = virtserialport_properties;
}
static const TypeInfo virtserialport_info = {
.name = "virtserialport",
.parent = TYPE_VIRTIO_SERIAL_PORT,
.instance_size = sizeof(VirtConsole),
.class_init = virtserialport_class_init,
};
static void virtconsole_register_types(void)
{
type_register_static(&virtconsole_info);
type_register_static(&virtserialport_info);
}
type_init(virtconsole_register_types)