root / hw / char / virtio-serial-bus.c @ a8aec295
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/*
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* A bus for connecting virtio serial and console ports
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*
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* Copyright (C) 2009, 2010 Red Hat, Inc.
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*
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* Author(s):
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* Amit Shah <amit.shah@redhat.com>
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*
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* Some earlier parts are:
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* Copyright IBM, Corp. 2008
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* authored by
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* Christian Ehrhardt <ehrhardt@linux.vnet.ibm.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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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "qemu/iov.h" |
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#include "monitor/monitor.h" |
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#include "qemu/queue.h" |
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#include "hw/sysbus.h" |
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#include "trace.h" |
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#include "hw/virtio/virtio-serial.h" |
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static VirtIOSerialPort *find_port_by_id(VirtIOSerial *vser, uint32_t id)
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{ |
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VirtIOSerialPort *port; |
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if (id == VIRTIO_CONSOLE_BAD_ID) {
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return NULL; |
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} |
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QTAILQ_FOREACH(port, &vser->ports, next) { |
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if (port->id == id)
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return port;
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} |
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return NULL; |
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} |
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static VirtIOSerialPort *find_port_by_vq(VirtIOSerial *vser, VirtQueue *vq)
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{ |
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VirtIOSerialPort *port; |
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QTAILQ_FOREACH(port, &vser->ports, next) { |
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if (port->ivq == vq || port->ovq == vq)
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return port;
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} |
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return NULL; |
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} |
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static bool use_multiport(VirtIOSerial *vser) |
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{ |
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VirtIODevice *vdev = VIRTIO_DEVICE(vser); |
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return vdev->guest_features & (1 << VIRTIO_CONSOLE_F_MULTIPORT); |
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} |
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static size_t write_to_port(VirtIOSerialPort *port,
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const uint8_t *buf, size_t size)
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{ |
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VirtQueueElement elem; |
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VirtQueue *vq; |
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size_t offset; |
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vq = port->ivq; |
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if (!virtio_queue_ready(vq)) {
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return 0; |
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} |
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offset = 0;
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while (offset < size) {
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size_t len; |
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if (!virtqueue_pop(vq, &elem)) {
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break;
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} |
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len = iov_from_buf(elem.in_sg, elem.in_num, 0,
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buf + offset, size - offset); |
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offset += len; |
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virtqueue_push(vq, &elem, len); |
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} |
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virtio_notify(VIRTIO_DEVICE(port->vser), vq); |
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return offset;
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} |
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static void discard_vq_data(VirtQueue *vq, VirtIODevice *vdev) |
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{ |
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VirtQueueElement elem; |
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if (!virtio_queue_ready(vq)) {
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return;
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} |
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while (virtqueue_pop(vq, &elem)) {
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virtqueue_push(vq, &elem, 0);
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} |
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virtio_notify(vdev, vq); |
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} |
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static void do_flush_queued_data(VirtIOSerialPort *port, VirtQueue *vq, |
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VirtIODevice *vdev) |
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{ |
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VirtIOSerialPortClass *vsc; |
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assert(port); |
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assert(virtio_queue_ready(vq)); |
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vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
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while (!port->throttled) {
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unsigned int i; |
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/* Pop an elem only if we haven't left off a previous one mid-way */
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if (!port->elem.out_num) {
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if (!virtqueue_pop(vq, &port->elem)) {
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break;
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} |
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port->iov_idx = 0;
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port->iov_offset = 0;
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} |
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for (i = port->iov_idx; i < port->elem.out_num; i++) {
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size_t buf_size; |
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ssize_t ret; |
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buf_size = port->elem.out_sg[i].iov_len - port->iov_offset; |
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ret = vsc->have_data(port, |
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port->elem.out_sg[i].iov_base |
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+ port->iov_offset, |
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buf_size); |
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if (port->throttled) {
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port->iov_idx = i; |
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if (ret > 0) { |
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port->iov_offset += ret; |
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} |
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break;
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} |
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port->iov_offset = 0;
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} |
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if (port->throttled) {
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break;
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} |
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virtqueue_push(vq, &port->elem, 0);
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port->elem.out_num = 0;
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} |
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virtio_notify(vdev, vq); |
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} |
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static void flush_queued_data(VirtIOSerialPort *port) |
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{ |
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assert(port); |
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if (!virtio_queue_ready(port->ovq)) {
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return;
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} |
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do_flush_queued_data(port, port->ovq, VIRTIO_DEVICE(port->vser)); |
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} |
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static size_t send_control_msg(VirtIOSerial *vser, void *buf, size_t len) |
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{ |
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VirtQueueElement elem; |
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VirtQueue *vq; |
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vq = vser->c_ivq; |
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if (!virtio_queue_ready(vq)) {
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return 0; |
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} |
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if (!virtqueue_pop(vq, &elem)) {
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return 0; |
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} |
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memcpy(elem.in_sg[0].iov_base, buf, len);
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virtqueue_push(vq, &elem, len); |
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virtio_notify(VIRTIO_DEVICE(vser), vq); |
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return len;
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} |
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static size_t send_control_event(VirtIOSerial *vser, uint32_t port_id,
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uint16_t event, uint16_t value) |
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{ |
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struct virtio_console_control cpkt;
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stl_p(&cpkt.id, port_id); |
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stw_p(&cpkt.event, event); |
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stw_p(&cpkt.value, value); |
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trace_virtio_serial_send_control_event(port_id, event, value); |
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return send_control_msg(vser, &cpkt, sizeof(cpkt)); |
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} |
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/* Functions for use inside qemu to open and read from/write to ports */
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int virtio_serial_open(VirtIOSerialPort *port)
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{ |
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/* Don't allow opening an already-open port */
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if (port->host_connected) {
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return 0; |
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} |
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/* Send port open notification to the guest */
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port->host_connected = true;
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send_control_event(port->vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 1);
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return 0; |
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} |
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int virtio_serial_close(VirtIOSerialPort *port)
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{ |
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port->host_connected = false;
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/*
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* If there's any data the guest sent which the app didn't
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* consume, reset the throttling flag and discard the data.
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*/
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port->throttled = false;
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discard_vq_data(port->ovq, VIRTIO_DEVICE(port->vser)); |
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send_control_event(port->vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 0);
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return 0; |
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} |
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/* Individual ports/apps call this function to write to the guest. */
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ssize_t virtio_serial_write(VirtIOSerialPort *port, const uint8_t *buf,
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size_t size) |
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{ |
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if (!port || !port->host_connected || !port->guest_connected) {
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return 0; |
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} |
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return write_to_port(port, buf, size);
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} |
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/*
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* Readiness of the guest to accept data on a port.
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* Returns max. data the guest can receive
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*/
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size_t virtio_serial_guest_ready(VirtIOSerialPort *port) |
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{ |
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VirtIODevice *vdev = VIRTIO_DEVICE(port->vser); |
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VirtQueue *vq = port->ivq; |
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unsigned int bytes; |
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if (!virtio_queue_ready(vq) ||
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!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) || |
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virtio_queue_empty(vq)) { |
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return 0; |
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} |
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if (use_multiport(port->vser) && !port->guest_connected) {
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return 0; |
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} |
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virtqueue_get_avail_bytes(vq, &bytes, NULL, 4096, 0); |
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return bytes;
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} |
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static void flush_queued_data_bh(void *opaque) |
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{ |
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VirtIOSerialPort *port = opaque; |
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flush_queued_data(port); |
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} |
263 |
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void virtio_serial_throttle_port(VirtIOSerialPort *port, bool throttle) |
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{ |
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if (!port) {
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return;
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} |
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trace_virtio_serial_throttle_port(port->id, throttle); |
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port->throttled = throttle; |
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if (throttle) {
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return;
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} |
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qemu_bh_schedule(port->bh); |
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} |
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/* Guest wants to notify us of some event */
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static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len) |
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{ |
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struct VirtIOSerialPort *port;
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VirtIOSerialPortClass *vsc; |
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struct virtio_console_control cpkt, *gcpkt;
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uint8_t *buffer; |
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size_t buffer_len; |
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gcpkt = buf; |
288 |
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if (len < sizeof(cpkt)) { |
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/* The guest sent an invalid control packet */
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return;
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} |
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cpkt.event = lduw_p(&gcpkt->event); |
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cpkt.value = lduw_p(&gcpkt->value); |
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trace_virtio_serial_handle_control_message(cpkt.event, cpkt.value); |
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if (cpkt.event == VIRTIO_CONSOLE_DEVICE_READY) {
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if (!cpkt.value) {
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error_report("virtio-serial-bus: Guest failure in adding device %s",
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vser->bus.qbus.name); |
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return;
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} |
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/*
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* The device is up, we can now tell the device about all the
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* ports we have here.
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*/
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QTAILQ_FOREACH(port, &vser->ports, next) { |
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send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_ADD, 1);
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} |
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return;
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} |
314 |
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port = find_port_by_id(vser, ldl_p(&gcpkt->id)); |
316 |
if (!port) {
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error_report("virtio-serial-bus: Unexpected port id %u for device %s",
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ldl_p(&gcpkt->id), vser->bus.qbus.name); |
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return;
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} |
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trace_virtio_serial_handle_control_message_port(port->id); |
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vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
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switch(cpkt.event) {
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case VIRTIO_CONSOLE_PORT_READY:
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if (!cpkt.value) {
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error_report("virtio-serial-bus: Guest failure in adding port %u for device %s",
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port->id, vser->bus.qbus.name); |
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break;
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} |
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/*
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* Now that we know the guest asked for the port name, we're
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* sure the guest has initialised whatever state is necessary
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* for this port. Now's a good time to let the guest know if
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* this port is a console port so that the guest can hook it
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* up to hvc.
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*/
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if (vsc->is_console) {
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send_control_event(vser, port->id, VIRTIO_CONSOLE_CONSOLE_PORT, 1);
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} |
343 |
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if (port->name) {
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stl_p(&cpkt.id, port->id); |
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stw_p(&cpkt.event, VIRTIO_CONSOLE_PORT_NAME); |
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stw_p(&cpkt.value, 1);
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buffer_len = sizeof(cpkt) + strlen(port->name) + 1; |
350 |
buffer = g_malloc(buffer_len); |
351 |
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memcpy(buffer, &cpkt, sizeof(cpkt));
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memcpy(buffer + sizeof(cpkt), port->name, strlen(port->name));
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buffer[buffer_len - 1] = 0; |
355 |
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356 |
send_control_msg(vser, buffer, buffer_len); |
357 |
g_free(buffer); |
358 |
} |
359 |
|
360 |
if (port->host_connected) {
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send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 1);
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} |
363 |
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364 |
/*
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* When the guest has asked us for this information it means
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* the guest is all setup and has its virtqueues
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* initialised. If some app is interested in knowing about
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* this event, let it know.
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*/
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370 |
if (vsc->guest_ready) {
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371 |
vsc->guest_ready(port); |
372 |
} |
373 |
break;
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374 |
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375 |
case VIRTIO_CONSOLE_PORT_OPEN:
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376 |
port->guest_connected = cpkt.value; |
377 |
if (vsc->set_guest_connected) {
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378 |
/* Send the guest opened notification if an app is interested */
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379 |
vsc->set_guest_connected(port, cpkt.value); |
380 |
} |
381 |
break;
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382 |
} |
383 |
} |
384 |
|
385 |
static void control_in(VirtIODevice *vdev, VirtQueue *vq) |
386 |
{ |
387 |
} |
388 |
|
389 |
static void control_out(VirtIODevice *vdev, VirtQueue *vq) |
390 |
{ |
391 |
VirtQueueElement elem; |
392 |
VirtIOSerial *vser; |
393 |
uint8_t *buf; |
394 |
size_t len; |
395 |
|
396 |
vser = VIRTIO_SERIAL(vdev); |
397 |
|
398 |
len = 0;
|
399 |
buf = NULL;
|
400 |
while (virtqueue_pop(vq, &elem)) {
|
401 |
size_t cur_len; |
402 |
|
403 |
cur_len = iov_size(elem.out_sg, elem.out_num); |
404 |
/*
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405 |
* Allocate a new buf only if we didn't have one previously or
|
406 |
* if the size of the buf differs
|
407 |
*/
|
408 |
if (cur_len > len) {
|
409 |
g_free(buf); |
410 |
|
411 |
buf = g_malloc(cur_len); |
412 |
len = cur_len; |
413 |
} |
414 |
iov_to_buf(elem.out_sg, elem.out_num, 0, buf, cur_len);
|
415 |
|
416 |
handle_control_message(vser, buf, cur_len); |
417 |
virtqueue_push(vq, &elem, 0);
|
418 |
} |
419 |
g_free(buf); |
420 |
virtio_notify(vdev, vq); |
421 |
} |
422 |
|
423 |
/* Guest wrote something to some port. */
|
424 |
static void handle_output(VirtIODevice *vdev, VirtQueue *vq) |
425 |
{ |
426 |
VirtIOSerial *vser; |
427 |
VirtIOSerialPort *port; |
428 |
|
429 |
vser = VIRTIO_SERIAL(vdev); |
430 |
port = find_port_by_vq(vser, vq); |
431 |
|
432 |
if (!port || !port->host_connected) {
|
433 |
discard_vq_data(vq, vdev); |
434 |
return;
|
435 |
} |
436 |
|
437 |
if (!port->throttled) {
|
438 |
do_flush_queued_data(port, vq, vdev); |
439 |
return;
|
440 |
} |
441 |
} |
442 |
|
443 |
static void handle_input(VirtIODevice *vdev, VirtQueue *vq) |
444 |
{ |
445 |
} |
446 |
|
447 |
static uint32_t get_features(VirtIODevice *vdev, uint32_t features)
|
448 |
{ |
449 |
VirtIOSerial *vser; |
450 |
|
451 |
vser = VIRTIO_SERIAL(vdev); |
452 |
|
453 |
if (vser->bus.max_nr_ports > 1) { |
454 |
features |= (1 << VIRTIO_CONSOLE_F_MULTIPORT);
|
455 |
} |
456 |
return features;
|
457 |
} |
458 |
|
459 |
/* Guest requested config info */
|
460 |
static void get_config(VirtIODevice *vdev, uint8_t *config_data) |
461 |
{ |
462 |
VirtIOSerial *vser; |
463 |
|
464 |
vser = VIRTIO_SERIAL(vdev); |
465 |
memcpy(config_data, &vser->config, sizeof(struct virtio_console_config)); |
466 |
} |
467 |
|
468 |
static void set_config(VirtIODevice *vdev, const uint8_t *config_data) |
469 |
{ |
470 |
struct virtio_console_config config;
|
471 |
|
472 |
memcpy(&config, config_data, sizeof(config));
|
473 |
} |
474 |
|
475 |
static void guest_reset(VirtIOSerial *vser) |
476 |
{ |
477 |
VirtIOSerialPort *port; |
478 |
VirtIOSerialPortClass *vsc; |
479 |
|
480 |
QTAILQ_FOREACH(port, &vser->ports, next) { |
481 |
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
482 |
if (port->guest_connected) {
|
483 |
port->guest_connected = false;
|
484 |
if (vsc->set_guest_connected) {
|
485 |
vsc->set_guest_connected(port, false);
|
486 |
} |
487 |
} |
488 |
} |
489 |
} |
490 |
|
491 |
static void set_status(VirtIODevice *vdev, uint8_t status) |
492 |
{ |
493 |
VirtIOSerial *vser; |
494 |
VirtIOSerialPort *port; |
495 |
|
496 |
vser = VIRTIO_SERIAL(vdev); |
497 |
port = find_port_by_id(vser, 0);
|
498 |
|
499 |
if (port && !use_multiport(port->vser)
|
500 |
&& (status & VIRTIO_CONFIG_S_DRIVER_OK)) { |
501 |
/*
|
502 |
* Non-multiport guests won't be able to tell us guest
|
503 |
* open/close status. Such guests can only have a port at id
|
504 |
* 0, so set guest_connected for such ports as soon as guest
|
505 |
* is up.
|
506 |
*/
|
507 |
port->guest_connected = true;
|
508 |
} |
509 |
if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
510 |
guest_reset(vser); |
511 |
} |
512 |
} |
513 |
|
514 |
static void vser_reset(VirtIODevice *vdev) |
515 |
{ |
516 |
VirtIOSerial *vser; |
517 |
|
518 |
vser = VIRTIO_SERIAL(vdev); |
519 |
guest_reset(vser); |
520 |
} |
521 |
|
522 |
static void virtio_serial_save(QEMUFile *f, void *opaque) |
523 |
{ |
524 |
VirtIOSerial *s = VIRTIO_SERIAL(opaque); |
525 |
VirtIOSerialPort *port; |
526 |
uint32_t nr_active_ports; |
527 |
unsigned int i, max_nr_ports; |
528 |
|
529 |
/* The virtio device */
|
530 |
virtio_save(VIRTIO_DEVICE(s), f); |
531 |
|
532 |
/* The config space */
|
533 |
qemu_put_be16s(f, &s->config.cols); |
534 |
qemu_put_be16s(f, &s->config.rows); |
535 |
|
536 |
qemu_put_be32s(f, &s->config.max_nr_ports); |
537 |
|
538 |
/* The ports map */
|
539 |
max_nr_ports = tswap32(s->config.max_nr_ports); |
540 |
for (i = 0; i < (max_nr_ports + 31) / 32; i++) { |
541 |
qemu_put_be32s(f, &s->ports_map[i]); |
542 |
} |
543 |
|
544 |
/* Ports */
|
545 |
|
546 |
nr_active_ports = 0;
|
547 |
QTAILQ_FOREACH(port, &s->ports, next) { |
548 |
nr_active_ports++; |
549 |
} |
550 |
|
551 |
qemu_put_be32s(f, &nr_active_ports); |
552 |
|
553 |
/*
|
554 |
* Items in struct VirtIOSerialPort.
|
555 |
*/
|
556 |
QTAILQ_FOREACH(port, &s->ports, next) { |
557 |
uint32_t elem_popped; |
558 |
|
559 |
qemu_put_be32s(f, &port->id); |
560 |
qemu_put_byte(f, port->guest_connected); |
561 |
qemu_put_byte(f, port->host_connected); |
562 |
|
563 |
elem_popped = 0;
|
564 |
if (port->elem.out_num) {
|
565 |
elem_popped = 1;
|
566 |
} |
567 |
qemu_put_be32s(f, &elem_popped); |
568 |
if (elem_popped) {
|
569 |
qemu_put_be32s(f, &port->iov_idx); |
570 |
qemu_put_be64s(f, &port->iov_offset); |
571 |
|
572 |
qemu_put_buffer(f, (unsigned char *)&port->elem, |
573 |
sizeof(port->elem));
|
574 |
} |
575 |
} |
576 |
} |
577 |
|
578 |
static void virtio_serial_post_load_timer_cb(void *opaque) |
579 |
{ |
580 |
uint32_t i; |
581 |
VirtIOSerial *s = VIRTIO_SERIAL(opaque); |
582 |
VirtIOSerialPort *port; |
583 |
uint8_t host_connected; |
584 |
VirtIOSerialPortClass *vsc; |
585 |
|
586 |
if (!s->post_load) {
|
587 |
return;
|
588 |
} |
589 |
for (i = 0 ; i < s->post_load->nr_active_ports; ++i) { |
590 |
port = s->post_load->connected[i].port; |
591 |
host_connected = s->post_load->connected[i].host_connected; |
592 |
if (host_connected != port->host_connected) {
|
593 |
/*
|
594 |
* We have to let the guest know of the host connection
|
595 |
* status change
|
596 |
*/
|
597 |
send_control_event(s, port->id, VIRTIO_CONSOLE_PORT_OPEN, |
598 |
port->host_connected); |
599 |
} |
600 |
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
601 |
if (vsc->set_guest_connected) {
|
602 |
vsc->set_guest_connected(port, port->guest_connected); |
603 |
} |
604 |
} |
605 |
g_free(s->post_load->connected); |
606 |
qemu_free_timer(s->post_load->timer); |
607 |
g_free(s->post_load); |
608 |
s->post_load = NULL;
|
609 |
} |
610 |
|
611 |
static int fetch_active_ports_list(QEMUFile *f, int version_id, |
612 |
VirtIOSerial *s, uint32_t nr_active_ports) |
613 |
{ |
614 |
uint32_t i; |
615 |
|
616 |
s->post_load = g_malloc0(sizeof(*s->post_load));
|
617 |
s->post_load->nr_active_ports = nr_active_ports; |
618 |
s->post_load->connected = |
619 |
g_malloc0(sizeof(*s->post_load->connected) * nr_active_ports);
|
620 |
|
621 |
s->post_load->timer = qemu_new_timer_ns(vm_clock, |
622 |
virtio_serial_post_load_timer_cb, |
623 |
s); |
624 |
|
625 |
/* Items in struct VirtIOSerialPort */
|
626 |
for (i = 0; i < nr_active_ports; i++) { |
627 |
VirtIOSerialPort *port; |
628 |
uint32_t id; |
629 |
|
630 |
id = qemu_get_be32(f); |
631 |
port = find_port_by_id(s, id); |
632 |
if (!port) {
|
633 |
return -EINVAL;
|
634 |
} |
635 |
|
636 |
port->guest_connected = qemu_get_byte(f); |
637 |
s->post_load->connected[i].port = port; |
638 |
s->post_load->connected[i].host_connected = qemu_get_byte(f); |
639 |
|
640 |
if (version_id > 2) { |
641 |
uint32_t elem_popped; |
642 |
|
643 |
qemu_get_be32s(f, &elem_popped); |
644 |
if (elem_popped) {
|
645 |
qemu_get_be32s(f, &port->iov_idx); |
646 |
qemu_get_be64s(f, &port->iov_offset); |
647 |
|
648 |
qemu_get_buffer(f, (unsigned char *)&port->elem, |
649 |
sizeof(port->elem));
|
650 |
virtqueue_map_sg(port->elem.in_sg, port->elem.in_addr, |
651 |
port->elem.in_num, 1);
|
652 |
virtqueue_map_sg(port->elem.out_sg, port->elem.out_addr, |
653 |
port->elem.out_num, 1);
|
654 |
|
655 |
/*
|
656 |
* Port was throttled on source machine. Let's
|
657 |
* unthrottle it here so data starts flowing again.
|
658 |
*/
|
659 |
virtio_serial_throttle_port(port, false);
|
660 |
} |
661 |
} |
662 |
} |
663 |
qemu_mod_timer(s->post_load->timer, 1);
|
664 |
return 0; |
665 |
} |
666 |
|
667 |
static int virtio_serial_load(QEMUFile *f, void *opaque, int version_id) |
668 |
{ |
669 |
VirtIOSerial *s = VIRTIO_SERIAL(opaque); |
670 |
uint32_t max_nr_ports, nr_active_ports, ports_map; |
671 |
unsigned int i; |
672 |
int ret;
|
673 |
|
674 |
if (version_id > 3) { |
675 |
return -EINVAL;
|
676 |
} |
677 |
|
678 |
/* The virtio device */
|
679 |
ret = virtio_load(VIRTIO_DEVICE(s), f); |
680 |
if (ret) {
|
681 |
return ret;
|
682 |
} |
683 |
|
684 |
if (version_id < 2) { |
685 |
return 0; |
686 |
} |
687 |
|
688 |
/* The config space */
|
689 |
qemu_get_be16s(f, &s->config.cols); |
690 |
qemu_get_be16s(f, &s->config.rows); |
691 |
|
692 |
qemu_get_be32s(f, &max_nr_ports); |
693 |
tswap32s(&max_nr_ports); |
694 |
if (max_nr_ports > tswap32(s->config.max_nr_ports)) {
|
695 |
/* Source could have had more ports than us. Fail migration. */
|
696 |
return -EINVAL;
|
697 |
} |
698 |
|
699 |
for (i = 0; i < (max_nr_ports + 31) / 32; i++) { |
700 |
qemu_get_be32s(f, &ports_map); |
701 |
|
702 |
if (ports_map != s->ports_map[i]) {
|
703 |
/*
|
704 |
* Ports active on source and destination don't
|
705 |
* match. Fail migration.
|
706 |
*/
|
707 |
return -EINVAL;
|
708 |
} |
709 |
} |
710 |
|
711 |
qemu_get_be32s(f, &nr_active_ports); |
712 |
|
713 |
if (nr_active_ports) {
|
714 |
ret = fetch_active_ports_list(f, version_id, s, nr_active_ports); |
715 |
if (ret) {
|
716 |
return ret;
|
717 |
} |
718 |
} |
719 |
return 0; |
720 |
} |
721 |
|
722 |
static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent); |
723 |
|
724 |
static Property virtser_props[] = {
|
725 |
DEFINE_PROP_UINT32("nr", VirtIOSerialPort, id, VIRTIO_CONSOLE_BAD_ID),
|
726 |
DEFINE_PROP_STRING("name", VirtIOSerialPort, name),
|
727 |
DEFINE_PROP_END_OF_LIST() |
728 |
}; |
729 |
|
730 |
#define TYPE_VIRTIO_SERIAL_BUS "virtio-serial-bus" |
731 |
#define VIRTIO_SERIAL_BUS(obj) \
|
732 |
OBJECT_CHECK(VirtIOSerialBus, (obj), TYPE_VIRTIO_SERIAL_BUS) |
733 |
|
734 |
static void virtser_bus_class_init(ObjectClass *klass, void *data) |
735 |
{ |
736 |
BusClass *k = BUS_CLASS(klass); |
737 |
k->print_dev = virtser_bus_dev_print; |
738 |
} |
739 |
|
740 |
static const TypeInfo virtser_bus_info = { |
741 |
.name = TYPE_VIRTIO_SERIAL_BUS, |
742 |
.parent = TYPE_BUS, |
743 |
.instance_size = sizeof(VirtIOSerialBus),
|
744 |
.class_init = virtser_bus_class_init, |
745 |
}; |
746 |
|
747 |
static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent) |
748 |
{ |
749 |
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev); |
750 |
|
751 |
monitor_printf(mon, "%*sport %d, guest %s, host %s, throttle %s\n",
|
752 |
indent, "", port->id,
|
753 |
port->guest_connected ? "on" : "off", |
754 |
port->host_connected ? "on" : "off", |
755 |
port->throttled ? "on" : "off"); |
756 |
} |
757 |
|
758 |
/* This function is only used if a port id is not provided by the user */
|
759 |
static uint32_t find_free_port_id(VirtIOSerial *vser)
|
760 |
{ |
761 |
unsigned int i, max_nr_ports; |
762 |
|
763 |
max_nr_ports = tswap32(vser->config.max_nr_ports); |
764 |
for (i = 0; i < (max_nr_ports + 31) / 32; i++) { |
765 |
uint32_t map, bit; |
766 |
|
767 |
map = vser->ports_map[i]; |
768 |
bit = ffs(~map); |
769 |
if (bit) {
|
770 |
return (bit - 1) + i * 32; |
771 |
} |
772 |
} |
773 |
return VIRTIO_CONSOLE_BAD_ID;
|
774 |
} |
775 |
|
776 |
static void mark_port_added(VirtIOSerial *vser, uint32_t port_id) |
777 |
{ |
778 |
unsigned int i; |
779 |
|
780 |
i = port_id / 32;
|
781 |
vser->ports_map[i] |= 1U << (port_id % 32); |
782 |
} |
783 |
|
784 |
static void add_port(VirtIOSerial *vser, uint32_t port_id) |
785 |
{ |
786 |
mark_port_added(vser, port_id); |
787 |
send_control_event(vser, port_id, VIRTIO_CONSOLE_PORT_ADD, 1);
|
788 |
} |
789 |
|
790 |
static void remove_port(VirtIOSerial *vser, uint32_t port_id) |
791 |
{ |
792 |
VirtIOSerialPort *port; |
793 |
unsigned int i; |
794 |
|
795 |
i = port_id / 32;
|
796 |
vser->ports_map[i] &= ~(1U << (port_id % 32)); |
797 |
|
798 |
port = find_port_by_id(vser, port_id); |
799 |
/*
|
800 |
* This function is only called from qdev's unplug callback; if we
|
801 |
* get a NULL port here, we're in trouble.
|
802 |
*/
|
803 |
assert(port); |
804 |
|
805 |
/* Flush out any unconsumed buffers first */
|
806 |
discard_vq_data(port->ovq, VIRTIO_DEVICE(port->vser)); |
807 |
|
808 |
send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_REMOVE, 1);
|
809 |
} |
810 |
|
811 |
static int virtser_port_qdev_init(DeviceState *qdev) |
812 |
{ |
813 |
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev); |
814 |
VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
815 |
VirtIOSerialBus *bus = DO_UPCAST(VirtIOSerialBus, qbus, qdev->parent_bus); |
816 |
int ret, max_nr_ports;
|
817 |
bool plugging_port0;
|
818 |
|
819 |
port->vser = bus->vser; |
820 |
port->bh = qemu_bh_new(flush_queued_data_bh, port); |
821 |
|
822 |
assert(vsc->have_data); |
823 |
|
824 |
/*
|
825 |
* Is the first console port we're seeing? If so, put it up at
|
826 |
* location 0. This is done for backward compatibility (old
|
827 |
* kernel, new qemu).
|
828 |
*/
|
829 |
plugging_port0 = vsc->is_console && !find_port_by_id(port->vser, 0);
|
830 |
|
831 |
if (find_port_by_id(port->vser, port->id)) {
|
832 |
error_report("virtio-serial-bus: A port already exists at id %u",
|
833 |
port->id); |
834 |
return -1; |
835 |
} |
836 |
|
837 |
if (port->id == VIRTIO_CONSOLE_BAD_ID) {
|
838 |
if (plugging_port0) {
|
839 |
port->id = 0;
|
840 |
} else {
|
841 |
port->id = find_free_port_id(port->vser); |
842 |
if (port->id == VIRTIO_CONSOLE_BAD_ID) {
|
843 |
error_report("virtio-serial-bus: Maximum port limit for this device reached");
|
844 |
return -1; |
845 |
} |
846 |
} |
847 |
} |
848 |
|
849 |
max_nr_ports = tswap32(port->vser->config.max_nr_ports); |
850 |
if (port->id >= max_nr_ports) {
|
851 |
error_report("virtio-serial-bus: Out-of-range port id specified, max. allowed: %u",
|
852 |
max_nr_ports - 1);
|
853 |
return -1; |
854 |
} |
855 |
|
856 |
ret = vsc->init(port); |
857 |
if (ret) {
|
858 |
return ret;
|
859 |
} |
860 |
|
861 |
port->elem.out_num = 0;
|
862 |
|
863 |
QTAILQ_INSERT_TAIL(&port->vser->ports, port, next); |
864 |
port->ivq = port->vser->ivqs[port->id]; |
865 |
port->ovq = port->vser->ovqs[port->id]; |
866 |
|
867 |
add_port(port->vser, port->id); |
868 |
|
869 |
/* Send an update to the guest about this new port added */
|
870 |
virtio_notify_config(VIRTIO_DEVICE(port->vser)); |
871 |
|
872 |
return ret;
|
873 |
} |
874 |
|
875 |
static int virtser_port_qdev_exit(DeviceState *qdev) |
876 |
{ |
877 |
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev); |
878 |
VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
879 |
VirtIOSerial *vser = port->vser; |
880 |
|
881 |
qemu_bh_delete(port->bh); |
882 |
remove_port(port->vser, port->id); |
883 |
|
884 |
QTAILQ_REMOVE(&vser->ports, port, next); |
885 |
|
886 |
if (vsc->exit) {
|
887 |
vsc->exit(port); |
888 |
} |
889 |
return 0; |
890 |
} |
891 |
|
892 |
static int virtio_serial_device_init(VirtIODevice *vdev) |
893 |
{ |
894 |
DeviceState *qdev = DEVICE(vdev); |
895 |
VirtIOSerial *vser = VIRTIO_SERIAL(vdev); |
896 |
uint32_t i, max_supported_ports; |
897 |
|
898 |
if (!vser->serial.max_virtserial_ports) {
|
899 |
return -1; |
900 |
} |
901 |
|
902 |
/* Each port takes 2 queues, and one pair is for the control queue */
|
903 |
max_supported_ports = VIRTIO_PCI_QUEUE_MAX / 2 - 1; |
904 |
|
905 |
if (vser->serial.max_virtserial_ports > max_supported_ports) {
|
906 |
error_report("maximum ports supported: %u", max_supported_ports);
|
907 |
return -1; |
908 |
} |
909 |
|
910 |
virtio_init(vdev, "virtio-serial", VIRTIO_ID_CONSOLE,
|
911 |
sizeof(struct virtio_console_config)); |
912 |
|
913 |
/* Spawn a new virtio-serial bus on which the ports will ride as devices */
|
914 |
qbus_create_inplace(&vser->bus.qbus, TYPE_VIRTIO_SERIAL_BUS, qdev, |
915 |
vdev->bus_name); |
916 |
vser->bus.qbus.allow_hotplug = 1;
|
917 |
vser->bus.vser = vser; |
918 |
QTAILQ_INIT(&vser->ports); |
919 |
|
920 |
vser->bus.max_nr_ports = vser->serial.max_virtserial_ports; |
921 |
vser->ivqs = g_malloc(vser->serial.max_virtserial_ports |
922 |
* sizeof(VirtQueue *));
|
923 |
vser->ovqs = g_malloc(vser->serial.max_virtserial_ports |
924 |
* sizeof(VirtQueue *));
|
925 |
|
926 |
/* Add a queue for host to guest transfers for port 0 (backward compat) */
|
927 |
vser->ivqs[0] = virtio_add_queue(vdev, 128, handle_input); |
928 |
/* Add a queue for guest to host transfers for port 0 (backward compat) */
|
929 |
vser->ovqs[0] = virtio_add_queue(vdev, 128, handle_output); |
930 |
|
931 |
/* TODO: host to guest notifications can get dropped
|
932 |
* if the queue fills up. Implement queueing in host,
|
933 |
* this might also make it possible to reduce the control
|
934 |
* queue size: as guest preposts buffers there,
|
935 |
* this will save 4Kbyte of guest memory per entry. */
|
936 |
|
937 |
/* control queue: host to guest */
|
938 |
vser->c_ivq = virtio_add_queue(vdev, 32, control_in);
|
939 |
/* control queue: guest to host */
|
940 |
vser->c_ovq = virtio_add_queue(vdev, 32, control_out);
|
941 |
|
942 |
for (i = 1; i < vser->bus.max_nr_ports; i++) { |
943 |
/* Add a per-port queue for host to guest transfers */
|
944 |
vser->ivqs[i] = virtio_add_queue(vdev, 128, handle_input);
|
945 |
/* Add a per-per queue for guest to host transfers */
|
946 |
vser->ovqs[i] = virtio_add_queue(vdev, 128, handle_output);
|
947 |
} |
948 |
|
949 |
vser->config.max_nr_ports = tswap32(vser->serial.max_virtserial_ports); |
950 |
vser->ports_map = g_malloc0(((vser->serial.max_virtserial_ports + 31) / 32) |
951 |
* sizeof(vser->ports_map[0])); |
952 |
/*
|
953 |
* Reserve location 0 for a console port for backward compat
|
954 |
* (old kernel, new qemu)
|
955 |
*/
|
956 |
mark_port_added(vser, 0);
|
957 |
|
958 |
vser->post_load = NULL;
|
959 |
|
960 |
/*
|
961 |
* Register for the savevm section with the virtio-console name
|
962 |
* to preserve backward compat
|
963 |
*/
|
964 |
register_savevm(qdev, "virtio-console", -1, 3, virtio_serial_save, |
965 |
virtio_serial_load, vser); |
966 |
|
967 |
return 0; |
968 |
} |
969 |
|
970 |
static void virtio_serial_port_class_init(ObjectClass *klass, void *data) |
971 |
{ |
972 |
DeviceClass *k = DEVICE_CLASS(klass); |
973 |
k->init = virtser_port_qdev_init; |
974 |
k->bus_type = TYPE_VIRTIO_SERIAL_BUS; |
975 |
k->exit = virtser_port_qdev_exit; |
976 |
k->unplug = qdev_simple_unplug_cb; |
977 |
k->props = virtser_props; |
978 |
} |
979 |
|
980 |
static const TypeInfo virtio_serial_port_type_info = { |
981 |
.name = TYPE_VIRTIO_SERIAL_PORT, |
982 |
.parent = TYPE_DEVICE, |
983 |
.instance_size = sizeof(VirtIOSerialPort),
|
984 |
.abstract = true,
|
985 |
.class_size = sizeof(VirtIOSerialPortClass),
|
986 |
.class_init = virtio_serial_port_class_init, |
987 |
}; |
988 |
|
989 |
static int virtio_serial_device_exit(DeviceState *dev) |
990 |
{ |
991 |
VirtIOSerial *vser = VIRTIO_SERIAL(dev); |
992 |
VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
993 |
|
994 |
unregister_savevm(dev, "virtio-console", vser);
|
995 |
|
996 |
g_free(vser->ivqs); |
997 |
g_free(vser->ovqs); |
998 |
g_free(vser->ports_map); |
999 |
if (vser->post_load) {
|
1000 |
g_free(vser->post_load->connected); |
1001 |
qemu_del_timer(vser->post_load->timer); |
1002 |
qemu_free_timer(vser->post_load->timer); |
1003 |
g_free(vser->post_load); |
1004 |
} |
1005 |
virtio_cleanup(vdev); |
1006 |
return 0; |
1007 |
} |
1008 |
|
1009 |
static Property virtio_serial_properties[] = {
|
1010 |
DEFINE_VIRTIO_SERIAL_PROPERTIES(VirtIOSerial, serial), |
1011 |
DEFINE_PROP_END_OF_LIST(), |
1012 |
}; |
1013 |
|
1014 |
static void virtio_serial_class_init(ObjectClass *klass, void *data) |
1015 |
{ |
1016 |
DeviceClass *dc = DEVICE_CLASS(klass); |
1017 |
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); |
1018 |
dc->exit = virtio_serial_device_exit; |
1019 |
dc->props = virtio_serial_properties; |
1020 |
vdc->init = virtio_serial_device_init; |
1021 |
vdc->get_features = get_features; |
1022 |
vdc->get_config = get_config; |
1023 |
vdc->set_config = set_config; |
1024 |
vdc->set_status = set_status; |
1025 |
vdc->reset = vser_reset; |
1026 |
} |
1027 |
|
1028 |
static const TypeInfo virtio_device_info = { |
1029 |
.name = TYPE_VIRTIO_SERIAL, |
1030 |
.parent = TYPE_VIRTIO_DEVICE, |
1031 |
.instance_size = sizeof(VirtIOSerial),
|
1032 |
.class_init = virtio_serial_class_init, |
1033 |
}; |
1034 |
|
1035 |
static void virtio_serial_register_types(void) |
1036 |
{ |
1037 |
type_register_static(&virtser_bus_info); |
1038 |
type_register_static(&virtio_serial_port_type_info); |
1039 |
type_register_static(&virtio_device_info); |
1040 |
} |
1041 |
|
1042 |
type_init(virtio_serial_register_types) |