root / hw / virtio-serial-bus.c @ a43f9c90
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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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#include "iov.h" |
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#include "monitor.h" |
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#include "qemu-queue.h" |
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#include "sysbus.h" |
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#include "virtio-serial.h" |
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/* The virtio-serial bus on top of which the ports will ride as devices */
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struct VirtIOSerialBus {
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BusState qbus; |
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/* This is the parent device that provides the bus for ports. */
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VirtIOSerial *vser; |
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/* The maximum number of ports that can ride on top of this bus */
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uint32_t max_nr_ports; |
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}; |
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struct VirtIOSerial {
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VirtIODevice vdev; |
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VirtQueue *c_ivq, *c_ovq; |
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/* Arrays of ivqs and ovqs: one per port */
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VirtQueue **ivqs, **ovqs; |
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VirtIOSerialBus *bus; |
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DeviceState *qdev; |
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QTAILQ_HEAD(, VirtIOSerialPort) ports; |
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/* bitmap for identifying active ports */
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uint32_t *ports_map; |
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struct virtio_console_config config;
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}; |
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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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return vser->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, |
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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(&port->vser->vdev, 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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assert(port); |
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assert(virtio_queue_ready(vq)); |
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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 = port->info->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 (ret < 0 && ret != -EAGAIN) { |
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/* We don't handle any other type of errors here */
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abort(); |
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} |
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if (ret == -EAGAIN || (ret >= 0 && ret < buf_size)) { |
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virtio_serial_throttle_port(port, true);
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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, &port->vser->vdev); |
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} |
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static size_t send_control_msg(VirtIOSerialPort *port, 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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struct virtio_console_control *cpkt;
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vq = port->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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cpkt = (struct virtio_console_control *)buf;
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stl_p(&cpkt->id, port->id); |
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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(&port->vser->vdev, vq); |
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return len;
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} |
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static size_t send_control_event(VirtIOSerialPort *port, uint16_t event,
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uint16_t value) |
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{ |
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struct virtio_console_control cpkt;
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stw_p(&cpkt.event, event); |
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stw_p(&cpkt.value, value); |
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return send_control_msg(port, &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, 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, &port->vser->vdev); |
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send_control_event(port, 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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VirtQueue *vq = port->ivq; |
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if (!virtio_queue_ready(vq) ||
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!(port->vser->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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if (virtqueue_avail_bytes(vq, 4096, 0)) { |
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return 4096; |
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} |
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if (virtqueue_avail_bytes(vq, 1, 0)) { |
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return 1; |
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} |
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return 0; |
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} |
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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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port->throttled = throttle; |
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if (throttle) {
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return;
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} |
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flush_queued_data(port); |
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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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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; |
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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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port = find_port_by_id(vser, ldl_p(&gcpkt->id)); |
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if (!port && cpkt.event != VIRTIO_CONSOLE_DEVICE_READY)
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return;
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switch(cpkt.event) {
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case 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\n",
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vser->bus->qbus.name); |
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break;
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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(port, VIRTIO_CONSOLE_PORT_ADD, 1);
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} |
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break;
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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\n",
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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 (port->is_console) {
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send_control_event(port, VIRTIO_CONSOLE_CONSOLE_PORT, 1);
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} |
356 |
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if (port->name) {
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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; |
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buffer = qemu_malloc(buffer_len); |
363 |
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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; |
367 |
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send_control_msg(port, buffer, buffer_len); |
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qemu_free(buffer); |
370 |
} |
371 |
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if (port->host_connected) {
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send_control_event(port, VIRTIO_CONSOLE_PORT_OPEN, 1);
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} |
375 |
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/*
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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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if (port->info->guest_ready) {
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port->info->guest_ready(port); |
384 |
} |
385 |
break;
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case VIRTIO_CONSOLE_PORT_OPEN:
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port->guest_connected = cpkt.value; |
389 |
if (cpkt.value && port->info->guest_open) {
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390 |
/* Send the guest opened notification if an app is interested */
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port->info->guest_open(port); |
392 |
} |
393 |
|
394 |
if (!cpkt.value && port->info->guest_close) {
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395 |
/* Send the guest closed notification if an app is interested */
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396 |
port->info->guest_close(port); |
397 |
} |
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break;
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} |
400 |
} |
401 |
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402 |
static void control_in(VirtIODevice *vdev, VirtQueue *vq) |
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{ |
404 |
} |
405 |
|
406 |
static void control_out(VirtIODevice *vdev, VirtQueue *vq) |
407 |
{ |
408 |
VirtQueueElement elem; |
409 |
VirtIOSerial *vser; |
410 |
uint8_t *buf; |
411 |
size_t len; |
412 |
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vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
414 |
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415 |
len = 0;
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416 |
buf = NULL;
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417 |
while (virtqueue_pop(vq, &elem)) {
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418 |
size_t cur_len, copied; |
419 |
|
420 |
cur_len = iov_size(elem.out_sg, elem.out_num); |
421 |
/*
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422 |
* Allocate a new buf only if we didn't have one previously or
|
423 |
* if the size of the buf differs
|
424 |
*/
|
425 |
if (cur_len > len) {
|
426 |
qemu_free(buf); |
427 |
|
428 |
buf = qemu_malloc(cur_len); |
429 |
len = cur_len; |
430 |
} |
431 |
copied = iov_to_buf(elem.out_sg, elem.out_num, buf, 0, len);
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432 |
|
433 |
handle_control_message(vser, buf, copied); |
434 |
virtqueue_push(vq, &elem, 0);
|
435 |
} |
436 |
qemu_free(buf); |
437 |
virtio_notify(vdev, vq); |
438 |
} |
439 |
|
440 |
/* Guest wrote something to some port. */
|
441 |
static void handle_output(VirtIODevice *vdev, VirtQueue *vq) |
442 |
{ |
443 |
VirtIOSerial *vser; |
444 |
VirtIOSerialPort *port; |
445 |
bool discard;
|
446 |
|
447 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
448 |
port = find_port_by_vq(vser, vq); |
449 |
|
450 |
discard = false;
|
451 |
if (!port || !port->host_connected || !port->info->have_data) {
|
452 |
discard = true;
|
453 |
} |
454 |
|
455 |
if (discard) {
|
456 |
discard_vq_data(vq, vdev); |
457 |
return;
|
458 |
} |
459 |
if (port->throttled) {
|
460 |
return;
|
461 |
} |
462 |
|
463 |
do_flush_queued_data(port, vq, vdev); |
464 |
} |
465 |
|
466 |
static void handle_input(VirtIODevice *vdev, VirtQueue *vq) |
467 |
{ |
468 |
} |
469 |
|
470 |
static uint32_t get_features(VirtIODevice *vdev, uint32_t features)
|
471 |
{ |
472 |
VirtIOSerial *vser; |
473 |
|
474 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
475 |
|
476 |
if (vser->bus->max_nr_ports > 1) { |
477 |
features |= (1 << VIRTIO_CONSOLE_F_MULTIPORT);
|
478 |
} |
479 |
return features;
|
480 |
} |
481 |
|
482 |
/* Guest requested config info */
|
483 |
static void get_config(VirtIODevice *vdev, uint8_t *config_data) |
484 |
{ |
485 |
VirtIOSerial *vser; |
486 |
|
487 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
488 |
memcpy(config_data, &vser->config, sizeof(struct virtio_console_config)); |
489 |
} |
490 |
|
491 |
static void set_config(VirtIODevice *vdev, const uint8_t *config_data) |
492 |
{ |
493 |
struct virtio_console_config config;
|
494 |
|
495 |
memcpy(&config, config_data, sizeof(config));
|
496 |
} |
497 |
|
498 |
static void virtio_serial_save(QEMUFile *f, void *opaque) |
499 |
{ |
500 |
VirtIOSerial *s = opaque; |
501 |
VirtIOSerialPort *port; |
502 |
uint32_t nr_active_ports; |
503 |
unsigned int i; |
504 |
|
505 |
/* The virtio device */
|
506 |
virtio_save(&s->vdev, f); |
507 |
|
508 |
/* The config space */
|
509 |
qemu_put_be16s(f, &s->config.cols); |
510 |
qemu_put_be16s(f, &s->config.rows); |
511 |
|
512 |
qemu_put_be32s(f, &s->config.max_nr_ports); |
513 |
|
514 |
/* The ports map */
|
515 |
|
516 |
for (i = 0; i < (s->config.max_nr_ports + 31) / 32; i++) { |
517 |
qemu_put_be32s(f, &s->ports_map[i]); |
518 |
} |
519 |
|
520 |
/* Ports */
|
521 |
|
522 |
nr_active_ports = 0;
|
523 |
QTAILQ_FOREACH(port, &s->ports, next) { |
524 |
nr_active_ports++; |
525 |
} |
526 |
|
527 |
qemu_put_be32s(f, &nr_active_ports); |
528 |
|
529 |
/*
|
530 |
* Items in struct VirtIOSerialPort.
|
531 |
*/
|
532 |
QTAILQ_FOREACH(port, &s->ports, next) { |
533 |
uint32_t elem_popped; |
534 |
|
535 |
qemu_put_be32s(f, &port->id); |
536 |
qemu_put_byte(f, port->guest_connected); |
537 |
qemu_put_byte(f, port->host_connected); |
538 |
|
539 |
elem_popped = 0;
|
540 |
if (port->elem.out_num) {
|
541 |
elem_popped = 1;
|
542 |
} |
543 |
qemu_put_be32s(f, &elem_popped); |
544 |
if (elem_popped) {
|
545 |
qemu_put_be32s(f, &port->iov_idx); |
546 |
qemu_put_be64s(f, &port->iov_offset); |
547 |
|
548 |
qemu_put_buffer(f, (unsigned char *)&port->elem, |
549 |
sizeof(port->elem));
|
550 |
} |
551 |
} |
552 |
} |
553 |
|
554 |
static int virtio_serial_load(QEMUFile *f, void *opaque, int version_id) |
555 |
{ |
556 |
VirtIOSerial *s = opaque; |
557 |
VirtIOSerialPort *port; |
558 |
uint32_t max_nr_ports, nr_active_ports, ports_map; |
559 |
unsigned int i; |
560 |
|
561 |
if (version_id > 3) { |
562 |
return -EINVAL;
|
563 |
} |
564 |
|
565 |
/* The virtio device */
|
566 |
virtio_load(&s->vdev, f); |
567 |
|
568 |
if (version_id < 2) { |
569 |
return 0; |
570 |
} |
571 |
|
572 |
/* The config space */
|
573 |
qemu_get_be16s(f, &s->config.cols); |
574 |
qemu_get_be16s(f, &s->config.rows); |
575 |
|
576 |
qemu_get_be32s(f, &max_nr_ports); |
577 |
if (max_nr_ports > s->config.max_nr_ports) {
|
578 |
/* Source could have had more ports than us. Fail migration. */
|
579 |
return -EINVAL;
|
580 |
} |
581 |
|
582 |
for (i = 0; i < (max_nr_ports + 31) / 32; i++) { |
583 |
qemu_get_be32s(f, &ports_map); |
584 |
|
585 |
if (ports_map != s->ports_map[i]) {
|
586 |
/*
|
587 |
* Ports active on source and destination don't
|
588 |
* match. Fail migration.
|
589 |
*/
|
590 |
return -EINVAL;
|
591 |
} |
592 |
} |
593 |
|
594 |
qemu_get_be32s(f, &nr_active_ports); |
595 |
|
596 |
/* Items in struct VirtIOSerialPort */
|
597 |
for (i = 0; i < nr_active_ports; i++) { |
598 |
uint32_t id; |
599 |
bool host_connected;
|
600 |
|
601 |
id = qemu_get_be32(f); |
602 |
port = find_port_by_id(s, id); |
603 |
|
604 |
port->guest_connected = qemu_get_byte(f); |
605 |
host_connected = qemu_get_byte(f); |
606 |
if (host_connected != port->host_connected) {
|
607 |
/*
|
608 |
* We have to let the guest know of the host connection
|
609 |
* status change
|
610 |
*/
|
611 |
send_control_event(port, VIRTIO_CONSOLE_PORT_OPEN, |
612 |
port->host_connected); |
613 |
} |
614 |
|
615 |
if (version_id > 2) { |
616 |
uint32_t elem_popped; |
617 |
|
618 |
qemu_get_be32s(f, &elem_popped); |
619 |
if (elem_popped) {
|
620 |
qemu_get_be32s(f, &port->iov_idx); |
621 |
qemu_get_be64s(f, &port->iov_offset); |
622 |
|
623 |
qemu_get_buffer(f, (unsigned char *)&port->elem, |
624 |
sizeof(port->elem));
|
625 |
virtqueue_map_sg(port->elem.in_sg, port->elem.in_addr, |
626 |
port->elem.in_num, 1);
|
627 |
virtqueue_map_sg(port->elem.out_sg, port->elem.out_addr, |
628 |
port->elem.out_num, 1);
|
629 |
|
630 |
/*
|
631 |
* Port was throttled on source machine. Let's
|
632 |
* unthrottle it here so data starts flowing again.
|
633 |
*/
|
634 |
virtio_serial_throttle_port(port, false);
|
635 |
} |
636 |
} |
637 |
} |
638 |
return 0; |
639 |
} |
640 |
|
641 |
static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent); |
642 |
|
643 |
static struct BusInfo virtser_bus_info = { |
644 |
.name = "virtio-serial-bus",
|
645 |
.size = sizeof(VirtIOSerialBus),
|
646 |
.print_dev = virtser_bus_dev_print, |
647 |
}; |
648 |
|
649 |
static VirtIOSerialBus *virtser_bus_new(DeviceState *dev)
|
650 |
{ |
651 |
VirtIOSerialBus *bus; |
652 |
|
653 |
bus = FROM_QBUS(VirtIOSerialBus, qbus_create(&virtser_bus_info, dev, NULL));
|
654 |
bus->qbus.allow_hotplug = 1;
|
655 |
|
656 |
return bus;
|
657 |
} |
658 |
|
659 |
static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent) |
660 |
{ |
661 |
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev); |
662 |
|
663 |
monitor_printf(mon, "%*s dev-prop-int: id: %u\n",
|
664 |
indent, "", port->id);
|
665 |
monitor_printf(mon, "%*s dev-prop-int: guest_connected: %d\n",
|
666 |
indent, "", port->guest_connected);
|
667 |
monitor_printf(mon, "%*s dev-prop-int: host_connected: %d\n",
|
668 |
indent, "", port->host_connected);
|
669 |
monitor_printf(mon, "%*s dev-prop-int: throttled: %d\n",
|
670 |
indent, "", port->throttled);
|
671 |
} |
672 |
|
673 |
/* This function is only used if a port id is not provided by the user */
|
674 |
static uint32_t find_free_port_id(VirtIOSerial *vser)
|
675 |
{ |
676 |
unsigned int i; |
677 |
|
678 |
for (i = 0; i < (vser->config.max_nr_ports + 31) / 32; i++) { |
679 |
uint32_t map, bit; |
680 |
|
681 |
map = vser->ports_map[i]; |
682 |
bit = ffs(~map); |
683 |
if (bit) {
|
684 |
return (bit - 1) + i * 32; |
685 |
} |
686 |
} |
687 |
return VIRTIO_CONSOLE_BAD_ID;
|
688 |
} |
689 |
|
690 |
static void mark_port_added(VirtIOSerial *vser, uint32_t port_id) |
691 |
{ |
692 |
unsigned int i; |
693 |
|
694 |
i = port_id / 32;
|
695 |
vser->ports_map[i] |= 1U << (port_id % 32); |
696 |
} |
697 |
|
698 |
static void add_port(VirtIOSerial *vser, uint32_t port_id) |
699 |
{ |
700 |
mark_port_added(vser, port_id); |
701 |
|
702 |
send_control_event(find_port_by_id(vser, port_id), |
703 |
VIRTIO_CONSOLE_PORT_ADD, 1);
|
704 |
} |
705 |
|
706 |
static void remove_port(VirtIOSerial *vser, uint32_t port_id) |
707 |
{ |
708 |
VirtIOSerialPort *port; |
709 |
unsigned int i; |
710 |
|
711 |
i = port_id / 32;
|
712 |
vser->ports_map[i] &= ~(1U << (port_id % 32)); |
713 |
|
714 |
port = find_port_by_id(vser, port_id); |
715 |
/* Flush out any unconsumed buffers first */
|
716 |
discard_vq_data(port->ovq, &port->vser->vdev); |
717 |
|
718 |
send_control_event(port, VIRTIO_CONSOLE_PORT_REMOVE, 1);
|
719 |
} |
720 |
|
721 |
static int virtser_port_qdev_init(DeviceState *qdev, DeviceInfo *base) |
722 |
{ |
723 |
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev); |
724 |
VirtIOSerialPortInfo *info = DO_UPCAST(VirtIOSerialPortInfo, qdev, base); |
725 |
VirtIOSerialBus *bus = DO_UPCAST(VirtIOSerialBus, qbus, qdev->parent_bus); |
726 |
int ret;
|
727 |
bool plugging_port0;
|
728 |
|
729 |
port->vser = bus->vser; |
730 |
|
731 |
/*
|
732 |
* Is the first console port we're seeing? If so, put it up at
|
733 |
* location 0. This is done for backward compatibility (old
|
734 |
* kernel, new qemu).
|
735 |
*/
|
736 |
plugging_port0 = port->is_console && !find_port_by_id(port->vser, 0);
|
737 |
|
738 |
if (find_port_by_id(port->vser, port->id)) {
|
739 |
error_report("virtio-serial-bus: A port already exists at id %u\n",
|
740 |
port->id); |
741 |
return -1; |
742 |
} |
743 |
|
744 |
if (port->id == VIRTIO_CONSOLE_BAD_ID) {
|
745 |
if (plugging_port0) {
|
746 |
port->id = 0;
|
747 |
} else {
|
748 |
port->id = find_free_port_id(port->vser); |
749 |
if (port->id == VIRTIO_CONSOLE_BAD_ID) {
|
750 |
error_report("virtio-serial-bus: Maximum port limit for this device reached\n");
|
751 |
return -1; |
752 |
} |
753 |
} |
754 |
} |
755 |
|
756 |
if (port->id >= port->vser->config.max_nr_ports) {
|
757 |
error_report("virtio-serial-bus: Out-of-range port id specified, max. allowed: %u\n",
|
758 |
port->vser->config.max_nr_ports - 1);
|
759 |
return -1; |
760 |
} |
761 |
|
762 |
port->info = info; |
763 |
ret = info->init(port); |
764 |
if (ret) {
|
765 |
return ret;
|
766 |
} |
767 |
|
768 |
if (!use_multiport(port->vser)) {
|
769 |
/*
|
770 |
* Allow writes to guest in this case; we have no way of
|
771 |
* knowing if a guest port is connected.
|
772 |
*/
|
773 |
port->guest_connected = true;
|
774 |
} |
775 |
|
776 |
port->elem.out_num = 0;
|
777 |
|
778 |
QTAILQ_INSERT_TAIL(&port->vser->ports, port, next); |
779 |
port->ivq = port->vser->ivqs[port->id]; |
780 |
port->ovq = port->vser->ovqs[port->id]; |
781 |
|
782 |
add_port(port->vser, port->id); |
783 |
|
784 |
/* Send an update to the guest about this new port added */
|
785 |
virtio_notify_config(&port->vser->vdev); |
786 |
|
787 |
return ret;
|
788 |
} |
789 |
|
790 |
static int virtser_port_qdev_exit(DeviceState *qdev) |
791 |
{ |
792 |
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev); |
793 |
VirtIOSerial *vser = port->vser; |
794 |
|
795 |
remove_port(port->vser, port->id); |
796 |
|
797 |
QTAILQ_REMOVE(&vser->ports, port, next); |
798 |
|
799 |
if (port->info->exit)
|
800 |
port->info->exit(port); |
801 |
|
802 |
return 0; |
803 |
} |
804 |
|
805 |
void virtio_serial_port_qdev_register(VirtIOSerialPortInfo *info)
|
806 |
{ |
807 |
info->qdev.init = virtser_port_qdev_init; |
808 |
info->qdev.bus_info = &virtser_bus_info; |
809 |
info->qdev.exit = virtser_port_qdev_exit; |
810 |
info->qdev.unplug = qdev_simple_unplug_cb; |
811 |
qdev_register(&info->qdev); |
812 |
} |
813 |
|
814 |
VirtIODevice *virtio_serial_init(DeviceState *dev, uint32_t max_nr_ports) |
815 |
{ |
816 |
VirtIOSerial *vser; |
817 |
VirtIODevice *vdev; |
818 |
uint32_t i, max_supported_ports; |
819 |
|
820 |
if (!max_nr_ports)
|
821 |
return NULL; |
822 |
|
823 |
/* Each port takes 2 queues, and one pair is for the control queue */
|
824 |
max_supported_ports = VIRTIO_PCI_QUEUE_MAX / 2 - 1; |
825 |
|
826 |
if (max_nr_ports > max_supported_ports) {
|
827 |
error_report("maximum ports supported: %u", max_supported_ports);
|
828 |
return NULL; |
829 |
} |
830 |
|
831 |
vdev = virtio_common_init("virtio-serial", VIRTIO_ID_CONSOLE,
|
832 |
sizeof(struct virtio_console_config), |
833 |
sizeof(VirtIOSerial));
|
834 |
|
835 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
836 |
|
837 |
/* Spawn a new virtio-serial bus on which the ports will ride as devices */
|
838 |
vser->bus = virtser_bus_new(dev); |
839 |
vser->bus->vser = vser; |
840 |
QTAILQ_INIT(&vser->ports); |
841 |
|
842 |
vser->bus->max_nr_ports = max_nr_ports; |
843 |
vser->ivqs = qemu_malloc(max_nr_ports * sizeof(VirtQueue *));
|
844 |
vser->ovqs = qemu_malloc(max_nr_ports * sizeof(VirtQueue *));
|
845 |
|
846 |
/* Add a queue for host to guest transfers for port 0 (backward compat) */
|
847 |
vser->ivqs[0] = virtio_add_queue(vdev, 128, handle_input); |
848 |
/* Add a queue for guest to host transfers for port 0 (backward compat) */
|
849 |
vser->ovqs[0] = virtio_add_queue(vdev, 128, handle_output); |
850 |
|
851 |
/* TODO: host to guest notifications can get dropped
|
852 |
* if the queue fills up. Implement queueing in host,
|
853 |
* this might also make it possible to reduce the control
|
854 |
* queue size: as guest preposts buffers there,
|
855 |
* this will save 4Kbyte of guest memory per entry. */
|
856 |
|
857 |
/* control queue: host to guest */
|
858 |
vser->c_ivq = virtio_add_queue(vdev, 32, control_in);
|
859 |
/* control queue: guest to host */
|
860 |
vser->c_ovq = virtio_add_queue(vdev, 32, control_out);
|
861 |
|
862 |
for (i = 1; i < vser->bus->max_nr_ports; i++) { |
863 |
/* Add a per-port queue for host to guest transfers */
|
864 |
vser->ivqs[i] = virtio_add_queue(vdev, 128, handle_input);
|
865 |
/* Add a per-per queue for guest to host transfers */
|
866 |
vser->ovqs[i] = virtio_add_queue(vdev, 128, handle_output);
|
867 |
} |
868 |
|
869 |
vser->config.max_nr_ports = max_nr_ports; |
870 |
vser->ports_map = qemu_mallocz(((max_nr_ports + 31) / 32) |
871 |
* sizeof(vser->ports_map[0])); |
872 |
/*
|
873 |
* Reserve location 0 for a console port for backward compat
|
874 |
* (old kernel, new qemu)
|
875 |
*/
|
876 |
mark_port_added(vser, 0);
|
877 |
|
878 |
vser->vdev.get_features = get_features; |
879 |
vser->vdev.get_config = get_config; |
880 |
vser->vdev.set_config = set_config; |
881 |
|
882 |
vser->qdev = dev; |
883 |
|
884 |
/*
|
885 |
* Register for the savevm section with the virtio-console name
|
886 |
* to preserve backward compat
|
887 |
*/
|
888 |
register_savevm(dev, "virtio-console", -1, 3, virtio_serial_save, |
889 |
virtio_serial_load, vser); |
890 |
|
891 |
return vdev;
|
892 |
} |
893 |
|
894 |
void virtio_serial_exit(VirtIODevice *vdev)
|
895 |
{ |
896 |
VirtIOSerial *vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
897 |
|
898 |
unregister_savevm(vser->qdev, "virtio-console", vser);
|
899 |
|
900 |
qemu_free(vser->ivqs); |
901 |
qemu_free(vser->ovqs); |
902 |
qemu_free(vser->ports_map); |
903 |
|
904 |
virtio_cleanup(vdev); |
905 |
} |