--- /dev/null
+/*
+ * 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 "sysemu/char.h"
+#include "qemu/error-report.h"
+#include "trace.h"
+#include "hw/virtio/virtio-serial.h"
+#include "qapi-event.h"
+
+#define TYPE_VIRTIO_CONSOLE_SERIAL_PORT "virtserialport"
+#define VIRTIO_CONSOLE(obj) \
+ OBJECT_CHECK(VirtConsole, (obj), TYPE_VIRTIO_CONSOLE_SERIAL_PORT)
+
+typedef struct VirtConsole {
+ VirtIOSerialPort parent_obj;
+
+ CharDriverState *chr;
+ guint watch;
+} 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;
+
+ vcon->watch = 0;
+ virtio_serial_throttle_port(VIRTIO_SERIAL_PORT(vcon), 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, ssize_t len)
+{
+ VirtConsole *vcon = VIRTIO_CONSOLE(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 < len) {
+ 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.
+ */
+ if (ret < 0)
+ ret = 0;
+ if (!k->is_console) {
+ virtio_serial_throttle_port(port, true);
+ if (!vcon->watch) {
+ vcon->watch = qemu_chr_fe_add_watch(vcon->chr,
+ G_IO_OUT|G_IO_HUP,
+ chr_write_unblocked, vcon);
+ }
+ }
+ }
+ return ret;
+}
+
+/* Callback function that's called when the guest opens/closes the port */
+static void set_guest_connected(VirtIOSerialPort *port, int guest_connected)
+{
+ VirtConsole *vcon = VIRTIO_CONSOLE(port);
+ DeviceState *dev = DEVICE(port);
+
+ if (vcon->chr) {
+ qemu_chr_fe_set_open(vcon->chr, guest_connected);
+ }
+
+ if (dev->id) {
+ qapi_event_send_vserport_change(dev->id, guest_connected,
+ &error_abort);
+ }
+}
+
+static void guest_writable(VirtIOSerialPort *port)
+{
+ VirtConsole *vcon = VIRTIO_CONSOLE(port);
+
+ if (vcon->chr) {
+ qemu_chr_accept_input(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(VIRTIO_SERIAL_PORT(vcon));
+}
+
+/* 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;
+ VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(vcon);
+
+ trace_virtio_console_chr_read(port->id, size);
+ virtio_serial_write(port, buf, size);
+}
+
+static void chr_event(void *opaque, int event)
+{
+ VirtConsole *vcon = opaque;
+ VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(vcon);
+
+ trace_virtio_console_chr_event(port->id, event);
+ switch (event) {
+ case CHR_EVENT_OPENED:
+ virtio_serial_open(port);
+ break;
+ case CHR_EVENT_CLOSED:
+ if (vcon->watch) {
+ g_source_remove(vcon->watch);
+ vcon->watch = 0;
+ }
+ virtio_serial_close(port);
+ break;
+ }
+}
+
+static void virtconsole_realize(DeviceState *dev, Error **errp)
+{
+ VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(dev);
+ VirtConsole *vcon = VIRTIO_CONSOLE(dev);
+ VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(dev);
+
+ if (port->id == 0 && !k->is_console) {
+ error_setg(errp, "Port number 0 on virtio-serial devices reserved "
+ "for virtconsole devices for backward compatibility.");
+ return;
+ }
+
+ if (vcon->chr) {
+ vcon->chr->explicit_fe_open = 1;
+ qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event,
+ vcon);
+ }
+}
+
+static void virtconsole_unrealize(DeviceState *dev, Error **errp)
+{
+ VirtConsole *vcon = VIRTIO_CONSOLE(dev);
+
+ if (vcon->watch) {
+ g_source_remove(vcon->watch);
+ }
+}
+
+static void virtconsole_class_init(ObjectClass *klass, void *data)
+{
+ VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass);
+
+ k->is_console = true;
+}
+
+static const TypeInfo virtconsole_info = {
+ .name = "virtconsole",
+ .parent = TYPE_VIRTIO_CONSOLE_SERIAL_PORT,
+ .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->realize = virtconsole_realize;
+ k->unrealize = virtconsole_unrealize;
+ k->have_data = flush_buf;
+ k->set_guest_connected = set_guest_connected;
+ k->guest_writable = guest_writable;
+ dc->props = virtserialport_properties;
+}
+
+static const TypeInfo virtserialport_info = {
+ .name = TYPE_VIRTIO_CONSOLE_SERIAL_PORT,
+ .parent = TYPE_VIRTIO_SERIAL_PORT,
+ .instance_size = sizeof(VirtConsole),
+ .class_init = virtserialport_class_init,
+};
+
+static void virtconsole_register_types(void)
+{
+ type_register_static(&virtserialport_info);
+ type_register_static(&virtconsole_info);
+}
+
+type_init(virtconsole_register_types)
Code Review / kvmfornfv.git / blobdiff