root / hw / virtio-console.c @ 60e1b2a6
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/*
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* Virtio Console and Generic Serial Port Devices
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*
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* Copyright Red Hat, Inc. 2009, 2010
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*
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* Authors:
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* Amit Shah <amit.shah@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*/
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#include "qemu-char.h" |
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#include "qemu-error.h" |
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#include "trace.h" |
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#include "virtio-serial.h" |
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typedef struct VirtConsole { |
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VirtIOSerialPort port; |
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CharDriverState *chr; |
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} VirtConsole; |
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/* Callback function that's called when the guest sends us data */
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static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len) |
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{ |
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VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
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ssize_t ret; |
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if (!vcon->chr) {
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/* If there's no backend, we can just say we consumed all data. */
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return len;
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} |
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ret = qemu_chr_fe_write(vcon->chr, buf, len); |
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trace_virtio_console_flush_buf(port->id, len, ret); |
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if (ret < 0) { |
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/*
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* Ideally we'd get a better error code than just -1, but
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* that's what the chardev interface gives us right now. If
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* we had a finer-grained message, like -EPIPE, we could close
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* this connection. Absent such error messages, the most we
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* can do is to return 0 here.
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*
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* This will prevent stray -1 values to go to
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* virtio-serial-bus.c and cause abort()s in
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* do_flush_queued_data().
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*/
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ret = 0;
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} |
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return ret;
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} |
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/* Callback function that's called when the guest opens the port */
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static void guest_open(VirtIOSerialPort *port) |
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{ |
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VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
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if (!vcon->chr) {
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return;
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} |
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qemu_chr_fe_open(vcon->chr); |
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} |
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/* Callback function that's called when the guest closes the port */
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static void guest_close(VirtIOSerialPort *port) |
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{ |
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VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
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if (!vcon->chr) {
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return;
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} |
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qemu_chr_fe_close(vcon->chr); |
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} |
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/* Readiness of the guest to accept data on a port */
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static int chr_can_read(void *opaque) |
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{ |
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VirtConsole *vcon = opaque; |
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return virtio_serial_guest_ready(&vcon->port);
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} |
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/* Send data from a char device over to the guest */
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static void chr_read(void *opaque, const uint8_t *buf, int size) |
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{ |
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VirtConsole *vcon = opaque; |
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trace_virtio_console_chr_read(vcon->port.id, size); |
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virtio_serial_write(&vcon->port, buf, size); |
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} |
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static void chr_event(void *opaque, int event) |
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{ |
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VirtConsole *vcon = opaque; |
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trace_virtio_console_chr_event(vcon->port.id, event); |
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switch (event) {
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case CHR_EVENT_OPENED:
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virtio_serial_open(&vcon->port); |
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break;
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case CHR_EVENT_CLOSED:
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virtio_serial_close(&vcon->port); |
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break;
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} |
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} |
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static int virtconsole_initfn(VirtIOSerialPort *port) |
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{ |
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VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
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VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
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if (port->id == 0 && !k->is_console) { |
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error_report("Port number 0 on virtio-serial devices reserved for virtconsole devices for backward compatibility.");
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return -1; |
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} |
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if (vcon->chr) {
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qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event, |
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vcon); |
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} |
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return 0; |
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} |
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static Property virtconsole_properties[] = {
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DEFINE_PROP_CHR("chardev", VirtConsole, chr),
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DEFINE_PROP_END_OF_LIST(), |
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}; |
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static void virtconsole_class_init(ObjectClass *klass, void *data) |
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{ |
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DeviceClass *dc = DEVICE_CLASS(klass); |
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VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass); |
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k->is_console = true;
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k->init = virtconsole_initfn; |
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k->have_data = flush_buf; |
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k->guest_open = guest_open; |
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k->guest_close = guest_close; |
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dc->props = virtconsole_properties; |
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} |
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static TypeInfo virtconsole_info = {
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.name = "virtconsole",
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.parent = TYPE_VIRTIO_SERIAL_PORT, |
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.instance_size = sizeof(VirtConsole),
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.class_init = virtconsole_class_init, |
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}; |
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static Property virtserialport_properties[] = {
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DEFINE_PROP_CHR("chardev", VirtConsole, chr),
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DEFINE_PROP_END_OF_LIST(), |
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}; |
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static void virtserialport_class_init(ObjectClass *klass, void *data) |
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{ |
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DeviceClass *dc = DEVICE_CLASS(klass); |
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VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass); |
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k->init = virtconsole_initfn; |
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k->have_data = flush_buf; |
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k->guest_open = guest_open; |
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k->guest_close = guest_close; |
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dc->props = virtserialport_properties; |
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} |
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static TypeInfo virtserialport_info = {
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.name = "virtserialport",
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.parent = TYPE_VIRTIO_SERIAL_PORT, |
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.instance_size = sizeof(VirtConsole),
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.class_init = virtserialport_class_init, |
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}; |
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static void virtconsole_register_types(void) |
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{ |
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type_register_static(&virtconsole_info); |
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type_register_static(&virtserialport_info); |
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} |
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type_init(virtconsole_register_types) |