diff options
Diffstat (limited to 'qemu/hw/char/virtio-serial-bus.c')
| -rw-r--r-- | qemu/hw/char/virtio-serial-bus.c | 1149 |
1 files changed, 0 insertions, 1149 deletions
diff --git a/qemu/hw/char/virtio-serial-bus.c b/qemu/hw/char/virtio-serial-bus.c deleted file mode 100644 index 6e5de6dec..000000000 --- a/qemu/hw/char/virtio-serial-bus.c +++ /dev/null @@ -1,1149 +0,0 @@ -/* - * A bus for connecting virtio serial and console ports - * - * Copyright (C) 2009, 2010 Red Hat, Inc. - * - * Author(s): - * Amit Shah <amit.shah@redhat.com> - * - * Some earlier parts are: - * Copyright IBM, Corp. 2008 - * authored by - * Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> - * - * This work is licensed under the terms of the GNU GPL, version 2. See - * the COPYING file in the top-level directory. - * - * Contributions after 2012-01-13 are licensed under the terms of the - * GNU GPL, version 2 or (at your option) any later version. - */ - -#include "qemu/osdep.h" -#include "qapi/error.h" -#include "qemu/iov.h" -#include "monitor/monitor.h" -#include "qemu/error-report.h" -#include "qemu/queue.h" -#include "hw/sysbus.h" -#include "trace.h" -#include "hw/virtio/virtio-serial.h" -#include "hw/virtio/virtio-access.h" - -static struct VirtIOSerialDevices { - QLIST_HEAD(, VirtIOSerial) devices; -} vserdevices; - -static VirtIOSerialPort *find_port_by_id(VirtIOSerial *vser, uint32_t id) -{ - VirtIOSerialPort *port; - - if (id == VIRTIO_CONSOLE_BAD_ID) { - return NULL; - } - - QTAILQ_FOREACH(port, &vser->ports, next) { - if (port->id == id) - return port; - } - return NULL; -} - -static VirtIOSerialPort *find_port_by_vq(VirtIOSerial *vser, VirtQueue *vq) -{ - VirtIOSerialPort *port; - - QTAILQ_FOREACH(port, &vser->ports, next) { - if (port->ivq == vq || port->ovq == vq) - return port; - } - return NULL; -} - -static VirtIOSerialPort *find_port_by_name(char *name) -{ - VirtIOSerial *vser; - - QLIST_FOREACH(vser, &vserdevices.devices, next) { - VirtIOSerialPort *port; - - QTAILQ_FOREACH(port, &vser->ports, next) { - if (port->name && !strcmp(port->name, name)) { - return port; - } - } - } - return NULL; -} - -static bool use_multiport(VirtIOSerial *vser) -{ - VirtIODevice *vdev = VIRTIO_DEVICE(vser); - return virtio_vdev_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT); -} - -static size_t write_to_port(VirtIOSerialPort *port, - const uint8_t *buf, size_t size) -{ - VirtQueueElement *elem; - VirtQueue *vq; - size_t offset; - - vq = port->ivq; - if (!virtio_queue_ready(vq)) { - return 0; - } - - offset = 0; - while (offset < size) { - size_t len; - - elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); - if (!elem) { - break; - } - - len = iov_from_buf(elem->in_sg, elem->in_num, 0, - buf + offset, size - offset); - offset += len; - - virtqueue_push(vq, elem, len); - g_free(elem); - } - - virtio_notify(VIRTIO_DEVICE(port->vser), vq); - return offset; -} - -static void discard_vq_data(VirtQueue *vq, VirtIODevice *vdev) -{ - VirtQueueElement *elem; - - if (!virtio_queue_ready(vq)) { - return; - } - for (;;) { - elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); - if (!elem) { - break; - } - virtqueue_push(vq, elem, 0); - g_free(elem); - } - virtio_notify(vdev, vq); -} - -static void do_flush_queued_data(VirtIOSerialPort *port, VirtQueue *vq, - VirtIODevice *vdev) -{ - VirtIOSerialPortClass *vsc; - - assert(port); - assert(virtio_queue_ready(vq)); - - vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); - - while (!port->throttled) { - unsigned int i; - - /* Pop an elem only if we haven't left off a previous one mid-way */ - if (!port->elem) { - port->elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); - if (!port->elem) { - break; - } - port->iov_idx = 0; - port->iov_offset = 0; - } - - for (i = port->iov_idx; i < port->elem->out_num; i++) { - size_t buf_size; - ssize_t ret; - - buf_size = port->elem->out_sg[i].iov_len - port->iov_offset; - ret = vsc->have_data(port, - port->elem->out_sg[i].iov_base - + port->iov_offset, - buf_size); - if (port->throttled) { - port->iov_idx = i; - if (ret > 0) { - port->iov_offset += ret; - } - break; - } - port->iov_offset = 0; - } - if (port->throttled) { - break; - } - virtqueue_push(vq, port->elem, 0); - g_free(port->elem); - port->elem = NULL; - } - virtio_notify(vdev, vq); -} - -static void flush_queued_data(VirtIOSerialPort *port) -{ - assert(port); - - if (!virtio_queue_ready(port->ovq)) { - return; - } - do_flush_queued_data(port, port->ovq, VIRTIO_DEVICE(port->vser)); -} - -static size_t send_control_msg(VirtIOSerial *vser, void *buf, size_t len) -{ - VirtQueueElement *elem; - VirtQueue *vq; - - vq = vser->c_ivq; - if (!virtio_queue_ready(vq)) { - return 0; - } - - elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); - if (!elem) { - return 0; - } - - /* TODO: detect a buffer that's too short, set NEEDS_RESET */ - iov_from_buf(elem->in_sg, elem->in_num, 0, buf, len); - - virtqueue_push(vq, elem, len); - virtio_notify(VIRTIO_DEVICE(vser), vq); - g_free(elem); - - return len; -} - -static size_t send_control_event(VirtIOSerial *vser, uint32_t port_id, - uint16_t event, uint16_t value) -{ - VirtIODevice *vdev = VIRTIO_DEVICE(vser); - struct virtio_console_control cpkt; - - virtio_stl_p(vdev, &cpkt.id, port_id); - virtio_stw_p(vdev, &cpkt.event, event); - virtio_stw_p(vdev, &cpkt.value, value); - - trace_virtio_serial_send_control_event(port_id, event, value); - return send_control_msg(vser, &cpkt, sizeof(cpkt)); -} - -/* Functions for use inside qemu to open and read from/write to ports */ -int virtio_serial_open(VirtIOSerialPort *port) -{ - /* Don't allow opening an already-open port */ - if (port->host_connected) { - return 0; - } - /* Send port open notification to the guest */ - port->host_connected = true; - send_control_event(port->vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 1); - - return 0; -} - -int virtio_serial_close(VirtIOSerialPort *port) -{ - port->host_connected = false; - /* - * If there's any data the guest sent which the app didn't - * consume, reset the throttling flag and discard the data. - */ - port->throttled = false; - discard_vq_data(port->ovq, VIRTIO_DEVICE(port->vser)); - - send_control_event(port->vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 0); - - return 0; -} - -/* Individual ports/apps call this function to write to the guest. */ -ssize_t virtio_serial_write(VirtIOSerialPort *port, const uint8_t *buf, - size_t size) -{ - if (!port || !port->host_connected || !port->guest_connected) { - return 0; - } - return write_to_port(port, buf, size); -} - -/* - * Readiness of the guest to accept data on a port. - * Returns max. data the guest can receive - */ -size_t virtio_serial_guest_ready(VirtIOSerialPort *port) -{ - VirtIODevice *vdev = VIRTIO_DEVICE(port->vser); - VirtQueue *vq = port->ivq; - unsigned int bytes; - - if (!virtio_queue_ready(vq) || - !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) || - virtio_queue_empty(vq)) { - return 0; - } - if (use_multiport(port->vser) && !port->guest_connected) { - return 0; - } - virtqueue_get_avail_bytes(vq, &bytes, NULL, 4096, 0); - return bytes; -} - -static void flush_queued_data_bh(void *opaque) -{ - VirtIOSerialPort *port = opaque; - - flush_queued_data(port); -} - -void virtio_serial_throttle_port(VirtIOSerialPort *port, bool throttle) -{ - if (!port) { - return; - } - - trace_virtio_serial_throttle_port(port->id, throttle); - port->throttled = throttle; - if (throttle) { - return; - } - qemu_bh_schedule(port->bh); -} - -/* Guest wants to notify us of some event */ -static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len) -{ - VirtIODevice *vdev = VIRTIO_DEVICE(vser); - struct VirtIOSerialPort *port; - VirtIOSerialPortClass *vsc; - struct virtio_console_control cpkt, *gcpkt; - uint8_t *buffer; - size_t buffer_len; - - gcpkt = buf; - - if (len < sizeof(cpkt)) { - /* The guest sent an invalid control packet */ - return; - } - - cpkt.event = virtio_lduw_p(vdev, &gcpkt->event); - cpkt.value = virtio_lduw_p(vdev, &gcpkt->value); - - trace_virtio_serial_handle_control_message(cpkt.event, cpkt.value); - - if (cpkt.event == VIRTIO_CONSOLE_DEVICE_READY) { - if (!cpkt.value) { - error_report("virtio-serial-bus: Guest failure in adding device %s", - vser->bus.qbus.name); - return; - } - /* - * The device is up, we can now tell the device about all the - * ports we have here. - */ - QTAILQ_FOREACH(port, &vser->ports, next) { - send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_ADD, 1); - } - return; - } - - port = find_port_by_id(vser, virtio_ldl_p(vdev, &gcpkt->id)); - if (!port) { - error_report("virtio-serial-bus: Unexpected port id %u for device %s", - virtio_ldl_p(vdev, &gcpkt->id), vser->bus.qbus.name); - return; - } - - trace_virtio_serial_handle_control_message_port(port->id); - - vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); - - switch(cpkt.event) { - case VIRTIO_CONSOLE_PORT_READY: - if (!cpkt.value) { - error_report("virtio-serial-bus: Guest failure in adding port %u for device %s", - port->id, vser->bus.qbus.name); - break; - } - /* - * Now that we know the guest asked for the port name, we're - * sure the guest has initialised whatever state is necessary - * for this port. Now's a good time to let the guest know if - * this port is a console port so that the guest can hook it - * up to hvc. - */ - if (vsc->is_console) { - send_control_event(vser, port->id, VIRTIO_CONSOLE_CONSOLE_PORT, 1); - } - - if (port->name) { - virtio_stl_p(vdev, &cpkt.id, port->id); - virtio_stw_p(vdev, &cpkt.event, VIRTIO_CONSOLE_PORT_NAME); - virtio_stw_p(vdev, &cpkt.value, 1); - - buffer_len = sizeof(cpkt) + strlen(port->name) + 1; - buffer = g_malloc(buffer_len); - - memcpy(buffer, &cpkt, sizeof(cpkt)); - memcpy(buffer + sizeof(cpkt), port->name, strlen(port->name)); - buffer[buffer_len - 1] = 0; - - send_control_msg(vser, buffer, buffer_len); - g_free(buffer); - } - - if (port->host_connected) { - send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 1); - } - - /* - * When the guest has asked us for this information it means - * the guest is all setup and has its virtqueues - * initialised. If some app is interested in knowing about - * this event, let it know. - */ - if (vsc->guest_ready) { - vsc->guest_ready(port); - } - break; - - case VIRTIO_CONSOLE_PORT_OPEN: - port->guest_connected = cpkt.value; - if (vsc->set_guest_connected) { - /* Send the guest opened notification if an app is interested */ - vsc->set_guest_connected(port, cpkt.value); - } - break; - } -} - -static void control_in(VirtIODevice *vdev, VirtQueue *vq) -{ -} - -static void control_out(VirtIODevice *vdev, VirtQueue *vq) -{ - VirtQueueElement *elem; - VirtIOSerial *vser; - uint8_t *buf; - size_t len; - - vser = VIRTIO_SERIAL(vdev); - - len = 0; - buf = NULL; - for (;;) { - size_t cur_len; - - elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); - if (!elem) { - break; - } - - cur_len = iov_size(elem->out_sg, elem->out_num); - /* - * Allocate a new buf only if we didn't have one previously or - * if the size of the buf differs - */ - if (cur_len > len) { - g_free(buf); - - buf = g_malloc(cur_len); - len = cur_len; - } - iov_to_buf(elem->out_sg, elem->out_num, 0, buf, cur_len); - - handle_control_message(vser, buf, cur_len); - virtqueue_push(vq, elem, 0); - g_free(elem); - } - g_free(buf); - virtio_notify(vdev, vq); -} - -/* Guest wrote something to some port. */ -static void handle_output(VirtIODevice *vdev, VirtQueue *vq) -{ - VirtIOSerial *vser; - VirtIOSerialPort *port; - - vser = VIRTIO_SERIAL(vdev); - port = find_port_by_vq(vser, vq); - - if (!port || !port->host_connected) { - discard_vq_data(vq, vdev); - return; - } - - if (!port->throttled) { - do_flush_queued_data(port, vq, vdev); - return; - } -} - -static void handle_input(VirtIODevice *vdev, VirtQueue *vq) -{ - /* - * Users of virtio-serial would like to know when guest becomes - * writable again -- i.e. if a vq had stuff queued up and the - * guest wasn't reading at all, the host would not be able to - * write to the vq anymore. Once the guest reads off something, - * we can start queueing things up again. However, this call is - * made for each buffer addition by the guest -- even though free - * buffers existed prior to the current buffer addition. This is - * done so as not to maintain previous state, which will need - * additional live-migration-related changes. - */ - VirtIOSerial *vser; - VirtIOSerialPort *port; - VirtIOSerialPortClass *vsc; - - vser = VIRTIO_SERIAL(vdev); - port = find_port_by_vq(vser, vq); - - if (!port) { - return; - } - vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); - - /* - * If guest_connected is false, this call is being made by the - * early-boot queueing up of descriptors, which is just noise for - * the host apps -- don't disturb them in that case. - */ - if (port->guest_connected && port->host_connected && vsc->guest_writable) { - vsc->guest_writable(port); - } -} - -static uint64_t get_features(VirtIODevice *vdev, uint64_t features, - Error **errp) -{ - VirtIOSerial *vser; - - vser = VIRTIO_SERIAL(vdev); - - if (vser->bus.max_nr_ports > 1) { - virtio_add_feature(&features, VIRTIO_CONSOLE_F_MULTIPORT); - } - return features; -} - -/* Guest requested config info */ -static void get_config(VirtIODevice *vdev, uint8_t *config_data) -{ - VirtIOSerial *vser = VIRTIO_SERIAL(vdev); - struct virtio_console_config *config = - (struct virtio_console_config *)config_data; - - config->cols = 0; - config->rows = 0; - config->max_nr_ports = virtio_tswap32(vdev, - vser->serial.max_virtserial_ports); -} - -static void guest_reset(VirtIOSerial *vser) -{ - VirtIOSerialPort *port; - VirtIOSerialPortClass *vsc; - - QTAILQ_FOREACH(port, &vser->ports, next) { - vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); - if (port->guest_connected) { - port->guest_connected = false; - if (vsc->set_guest_connected) { - vsc->set_guest_connected(port, false); - } - } - } -} - -static void set_status(VirtIODevice *vdev, uint8_t status) -{ - VirtIOSerial *vser; - VirtIOSerialPort *port; - - vser = VIRTIO_SERIAL(vdev); - port = find_port_by_id(vser, 0); - - if (port && !use_multiport(port->vser) - && (status & VIRTIO_CONFIG_S_DRIVER_OK)) { - /* - * Non-multiport guests won't be able to tell us guest - * open/close status. Such guests can only have a port at id - * 0, so set guest_connected for such ports as soon as guest - * is up. - */ - port->guest_connected = true; - } - if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) { - guest_reset(vser); - } -} - -static void vser_reset(VirtIODevice *vdev) -{ - VirtIOSerial *vser; - - vser = VIRTIO_SERIAL(vdev); - guest_reset(vser); -} - -static void virtio_serial_save(QEMUFile *f, void *opaque) -{ - /* The virtio device */ - virtio_save(VIRTIO_DEVICE(opaque), f); -} - -static void virtio_serial_save_device(VirtIODevice *vdev, QEMUFile *f) -{ - VirtIOSerial *s = VIRTIO_SERIAL(vdev); - VirtIOSerialPort *port; - uint32_t nr_active_ports; - unsigned int i, max_nr_ports; - struct virtio_console_config config; - - /* The config space (ignored on the far end in current versions) */ - get_config(vdev, (uint8_t *)&config); - qemu_put_be16s(f, &config.cols); - qemu_put_be16s(f, &config.rows); - qemu_put_be32s(f, &config.max_nr_ports); - - /* The ports map */ - max_nr_ports = s->serial.max_virtserial_ports; - for (i = 0; i < (max_nr_ports + 31) / 32; i++) { - qemu_put_be32s(f, &s->ports_map[i]); - } - - /* Ports */ - - nr_active_ports = 0; - QTAILQ_FOREACH(port, &s->ports, next) { - nr_active_ports++; - } - - qemu_put_be32s(f, &nr_active_ports); - - /* - * Items in struct VirtIOSerialPort. - */ - QTAILQ_FOREACH(port, &s->ports, next) { - uint32_t elem_popped; - - qemu_put_be32s(f, &port->id); - qemu_put_byte(f, port->guest_connected); - qemu_put_byte(f, port->host_connected); - - elem_popped = 0; - if (port->elem) { - elem_popped = 1; - } - qemu_put_be32s(f, &elem_popped); - if (elem_popped) { - qemu_put_be32s(f, &port->iov_idx); - qemu_put_be64s(f, &port->iov_offset); - qemu_put_virtqueue_element(f, port->elem); - } - } -} - -static void virtio_serial_post_load_timer_cb(void *opaque) -{ - uint32_t i; - VirtIOSerial *s = VIRTIO_SERIAL(opaque); - VirtIOSerialPort *port; - uint8_t host_connected; - VirtIOSerialPortClass *vsc; - - if (!s->post_load) { - return; - } - for (i = 0 ; i < s->post_load->nr_active_ports; ++i) { - port = s->post_load->connected[i].port; - host_connected = s->post_load->connected[i].host_connected; - if (host_connected != port->host_connected) { - /* - * We have to let the guest know of the host connection - * status change - */ - send_control_event(s, port->id, VIRTIO_CONSOLE_PORT_OPEN, - port->host_connected); - } - vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); - if (vsc->set_guest_connected) { - vsc->set_guest_connected(port, port->guest_connected); - } - } - g_free(s->post_load->connected); - timer_free(s->post_load->timer); - g_free(s->post_load); - s->post_load = NULL; -} - -static int fetch_active_ports_list(QEMUFile *f, int version_id, - VirtIOSerial *s, uint32_t nr_active_ports) -{ - uint32_t i; - - s->post_load = g_malloc0(sizeof(*s->post_load)); - s->post_load->nr_active_ports = nr_active_ports; - s->post_load->connected = - g_malloc0(sizeof(*s->post_load->connected) * nr_active_ports); - - s->post_load->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, - virtio_serial_post_load_timer_cb, - s); - - /* Items in struct VirtIOSerialPort */ - for (i = 0; i < nr_active_ports; i++) { - VirtIOSerialPort *port; - uint32_t id; - - id = qemu_get_be32(f); - port = find_port_by_id(s, id); - if (!port) { - return -EINVAL; - } - - port->guest_connected = qemu_get_byte(f); - s->post_load->connected[i].port = port; - s->post_load->connected[i].host_connected = qemu_get_byte(f); - - if (version_id > 2) { - uint32_t elem_popped; - - qemu_get_be32s(f, &elem_popped); - if (elem_popped) { - qemu_get_be32s(f, &port->iov_idx); - qemu_get_be64s(f, &port->iov_offset); - - port->elem = - qemu_get_virtqueue_element(f, sizeof(VirtQueueElement)); - - /* - * Port was throttled on source machine. Let's - * unthrottle it here so data starts flowing again. - */ - virtio_serial_throttle_port(port, false); - } - } - } - timer_mod(s->post_load->timer, 1); - return 0; -} - -static int virtio_serial_load(QEMUFile *f, void *opaque, int version_id) -{ - if (version_id > 3) { - return -EINVAL; - } - - /* The virtio device */ - return virtio_load(VIRTIO_DEVICE(opaque), f, version_id); -} - -static int virtio_serial_load_device(VirtIODevice *vdev, QEMUFile *f, - int version_id) -{ - VirtIOSerial *s = VIRTIO_SERIAL(vdev); - uint32_t max_nr_ports, nr_active_ports, ports_map; - unsigned int i; - int ret; - uint32_t tmp; - - if (version_id < 2) { - return 0; - } - - /* Unused */ - qemu_get_be16s(f, (uint16_t *) &tmp); - qemu_get_be16s(f, (uint16_t *) &tmp); - qemu_get_be32s(f, &tmp); - - max_nr_ports = s->serial.max_virtserial_ports; - for (i = 0; i < (max_nr_ports + 31) / 32; i++) { - qemu_get_be32s(f, &ports_map); - - if (ports_map != s->ports_map[i]) { - /* - * Ports active on source and destination don't - * match. Fail migration. - */ - return -EINVAL; - } - } - - qemu_get_be32s(f, &nr_active_ports); - - if (nr_active_ports) { - ret = fetch_active_ports_list(f, version_id, s, nr_active_ports); - if (ret) { - return ret; - } - } - return 0; -} - -static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent); - -static Property virtser_props[] = { - DEFINE_PROP_UINT32("nr", VirtIOSerialPort, id, VIRTIO_CONSOLE_BAD_ID), - DEFINE_PROP_STRING("name", VirtIOSerialPort, name), - DEFINE_PROP_END_OF_LIST() -}; - -#define TYPE_VIRTIO_SERIAL_BUS "virtio-serial-bus" -#define VIRTIO_SERIAL_BUS(obj) \ - OBJECT_CHECK(VirtIOSerialBus, (obj), TYPE_VIRTIO_SERIAL_BUS) - -static void virtser_bus_class_init(ObjectClass *klass, void *data) -{ - BusClass *k = BUS_CLASS(klass); - k->print_dev = virtser_bus_dev_print; -} - -static const TypeInfo virtser_bus_info = { - .name = TYPE_VIRTIO_SERIAL_BUS, - .parent = TYPE_BUS, - .instance_size = sizeof(VirtIOSerialBus), - .class_init = virtser_bus_class_init, -}; - -static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent) -{ - VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(qdev); - - monitor_printf(mon, "%*sport %d, guest %s, host %s, throttle %s\n", - indent, "", port->id, - port->guest_connected ? "on" : "off", - port->host_connected ? "on" : "off", - port->throttled ? "on" : "off"); -} - -/* This function is only used if a port id is not provided by the user */ -static uint32_t find_free_port_id(VirtIOSerial *vser) -{ - unsigned int i, max_nr_ports; - - max_nr_ports = vser->serial.max_virtserial_ports; - for (i = 0; i < (max_nr_ports + 31) / 32; i++) { - uint32_t map, zeroes; - - map = vser->ports_map[i]; - zeroes = ctz32(~map); - if (zeroes != 32) { - return zeroes + i * 32; - } - } - return VIRTIO_CONSOLE_BAD_ID; -} - -static void mark_port_added(VirtIOSerial *vser, uint32_t port_id) -{ - unsigned int i; - - i = port_id / 32; - vser->ports_map[i] |= 1U << (port_id % 32); -} - -static void add_port(VirtIOSerial *vser, uint32_t port_id) -{ - mark_port_added(vser, port_id); - send_control_event(vser, port_id, VIRTIO_CONSOLE_PORT_ADD, 1); -} - -static void remove_port(VirtIOSerial *vser, uint32_t port_id) -{ - VirtIOSerialPort *port; - - /* - * Don't mark port 0 removed -- we explicitly reserve it for - * backward compat with older guests, ensure a virtconsole device - * unplug retains the reservation. - */ - if (port_id) { - unsigned int i; - - i = port_id / 32; - vser->ports_map[i] &= ~(1U << (port_id % 32)); - } - - port = find_port_by_id(vser, port_id); - /* - * This function is only called from qdev's unplug callback; if we - * get a NULL port here, we're in trouble. - */ - assert(port); - - /* Flush out any unconsumed buffers first */ - discard_vq_data(port->ovq, VIRTIO_DEVICE(port->vser)); - - send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_REMOVE, 1); -} - -static void virtser_port_device_realize(DeviceState *dev, Error **errp) -{ - VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(dev); - VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); - VirtIOSerialBus *bus = VIRTIO_SERIAL_BUS(qdev_get_parent_bus(dev)); - int max_nr_ports; - bool plugging_port0; - Error *err = NULL; - - port->vser = bus->vser; - port->bh = qemu_bh_new(flush_queued_data_bh, port); - - assert(vsc->have_data); - - /* - * Is the first console port we're seeing? If so, put it up at - * location 0. This is done for backward compatibility (old - * kernel, new qemu). - */ - plugging_port0 = vsc->is_console && !find_port_by_id(port->vser, 0); - - if (find_port_by_id(port->vser, port->id)) { - error_setg(errp, "virtio-serial-bus: A port already exists at id %u", - port->id); - return; - } - - if (port->name != NULL && find_port_by_name(port->name)) { - error_setg(errp, "virtio-serial-bus: A port already exists by name %s", - port->name); - return; - } - - if (port->id == VIRTIO_CONSOLE_BAD_ID) { - if (plugging_port0) { - port->id = 0; - } else { - port->id = find_free_port_id(port->vser); - if (port->id == VIRTIO_CONSOLE_BAD_ID) { - error_setg(errp, "virtio-serial-bus: Maximum port limit for " - "this device reached"); - return; - } - } - } - - max_nr_ports = port->vser->serial.max_virtserial_ports; - if (port->id >= max_nr_ports) { - error_setg(errp, "virtio-serial-bus: Out-of-range port id specified, " - "max. allowed: %u", max_nr_ports - 1); - return; - } - - vsc->realize(dev, &err); - if (err != NULL) { - error_propagate(errp, err); - return; - } - - port->elem = NULL; -} - -static void virtser_port_device_plug(HotplugHandler *hotplug_dev, - DeviceState *dev, Error **errp) -{ - VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(dev); - - QTAILQ_INSERT_TAIL(&port->vser->ports, port, next); - port->ivq = port->vser->ivqs[port->id]; - port->ovq = port->vser->ovqs[port->id]; - - add_port(port->vser, port->id); - - /* Send an update to the guest about this new port added */ - virtio_notify_config(VIRTIO_DEVICE(hotplug_dev)); -} - -static void virtser_port_device_unrealize(DeviceState *dev, Error **errp) -{ - VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(dev); - VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(dev); - VirtIOSerial *vser = port->vser; - - qemu_bh_delete(port->bh); - remove_port(port->vser, port->id); - - QTAILQ_REMOVE(&vser->ports, port, next); - - if (vsc->unrealize) { - vsc->unrealize(dev, errp); - } -} - -static void virtio_serial_device_realize(DeviceState *dev, Error **errp) -{ - VirtIODevice *vdev = VIRTIO_DEVICE(dev); - VirtIOSerial *vser = VIRTIO_SERIAL(dev); - uint32_t i, max_supported_ports; - - if (!vser->serial.max_virtserial_ports) { - error_setg(errp, "Maximum number of serial ports not specified"); - return; - } - - /* Each port takes 2 queues, and one pair is for the control queue */ - max_supported_ports = VIRTIO_QUEUE_MAX / 2 - 1; - - if (vser->serial.max_virtserial_ports > max_supported_ports) { - error_setg(errp, "maximum ports supported: %u", max_supported_ports); - return; - } - - /* We don't support emergency write, skip it for now. */ - /* TODO: cleaner fix, depending on host features. */ - virtio_init(vdev, "virtio-serial", VIRTIO_ID_CONSOLE, - offsetof(struct virtio_console_config, emerg_wr)); - - /* Spawn a new virtio-serial bus on which the ports will ride as devices */ - qbus_create_inplace(&vser->bus, sizeof(vser->bus), TYPE_VIRTIO_SERIAL_BUS, - dev, vdev->bus_name); - qbus_set_hotplug_handler(BUS(&vser->bus), DEVICE(vser), errp); - vser->bus.vser = vser; - QTAILQ_INIT(&vser->ports); - - vser->bus.max_nr_ports = vser->serial.max_virtserial_ports; - vser->ivqs = g_malloc(vser->serial.max_virtserial_ports - * sizeof(VirtQueue *)); - vser->ovqs = g_malloc(vser->serial.max_virtserial_ports - * sizeof(VirtQueue *)); - - /* Add a queue for host to guest transfers for port 0 (backward compat) */ - vser->ivqs[0] = virtio_add_queue(vdev, 128, handle_input); - /* Add a queue for guest to host transfers for port 0 (backward compat) */ - vser->ovqs[0] = virtio_add_queue(vdev, 128, handle_output); - - /* TODO: host to guest notifications can get dropped - * if the queue fills up. Implement queueing in host, - * this might also make it possible to reduce the control - * queue size: as guest preposts buffers there, - * this will save 4Kbyte of guest memory per entry. */ - - /* control queue: host to guest */ - vser->c_ivq = virtio_add_queue(vdev, 32, control_in); - /* control queue: guest to host */ - vser->c_ovq = virtio_add_queue(vdev, 32, control_out); - - for (i = 1; i < vser->bus.max_nr_ports; i++) { - /* Add a per-port queue for host to guest transfers */ - vser->ivqs[i] = virtio_add_queue(vdev, 128, handle_input); - /* Add a per-per queue for guest to host transfers */ - vser->ovqs[i] = virtio_add_queue(vdev, 128, handle_output); - } - - vser->ports_map = g_malloc0(((vser->serial.max_virtserial_ports + 31) / 32) - * sizeof(vser->ports_map[0])); - /* - * Reserve location 0 for a console port for backward compat - * (old kernel, new qemu) - */ - mark_port_added(vser, 0); - - vser->post_load = NULL; - - /* - * Register for the savevm section with the virtio-console name - * to preserve backward compat - */ - register_savevm(dev, "virtio-console", -1, 3, virtio_serial_save, - virtio_serial_load, vser); - - QLIST_INSERT_HEAD(&vserdevices.devices, vser, next); -} - -static void virtio_serial_port_class_init(ObjectClass *klass, void *data) -{ - DeviceClass *k = DEVICE_CLASS(klass); - - set_bit(DEVICE_CATEGORY_INPUT, k->categories); - k->bus_type = TYPE_VIRTIO_SERIAL_BUS; - k->realize = virtser_port_device_realize; - k->unrealize = virtser_port_device_unrealize; - k->props = virtser_props; -} - -static const TypeInfo virtio_serial_port_type_info = { - .name = TYPE_VIRTIO_SERIAL_PORT, - .parent = TYPE_DEVICE, - .instance_size = sizeof(VirtIOSerialPort), - .abstract = true, - .class_size = sizeof(VirtIOSerialPortClass), - .class_init = virtio_serial_port_class_init, -}; - -static void virtio_serial_device_unrealize(DeviceState *dev, Error **errp) -{ - VirtIODevice *vdev = VIRTIO_DEVICE(dev); - VirtIOSerial *vser = VIRTIO_SERIAL(dev); - - QLIST_REMOVE(vser, next); - - unregister_savevm(dev, "virtio-console", vser); - - g_free(vser->ivqs); - g_free(vser->ovqs); - g_free(vser->ports_map); - if (vser->post_load) { - g_free(vser->post_load->connected); - timer_del(vser->post_load->timer); - timer_free(vser->post_load->timer); - g_free(vser->post_load); - } - virtio_cleanup(vdev); -} - -static Property virtio_serial_properties[] = { - DEFINE_PROP_UINT32("max_ports", VirtIOSerial, serial.max_virtserial_ports, - 31), - DEFINE_PROP_END_OF_LIST(), -}; - -static void virtio_serial_class_init(ObjectClass *klass, void *data) -{ - DeviceClass *dc = DEVICE_CLASS(klass); - VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); - HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); - - QLIST_INIT(&vserdevices.devices); - - dc->props = virtio_serial_properties; - set_bit(DEVICE_CATEGORY_INPUT, dc->categories); - vdc->realize = virtio_serial_device_realize; - vdc->unrealize = virtio_serial_device_unrealize; - vdc->get_features = get_features; - vdc->get_config = get_config; - vdc->set_status = set_status; - vdc->reset = vser_reset; - vdc->save = virtio_serial_save_device; - vdc->load = virtio_serial_load_device; - hc->plug = virtser_port_device_plug; - hc->unplug = qdev_simple_device_unplug_cb; -} - -static const TypeInfo virtio_device_info = { - .name = TYPE_VIRTIO_SERIAL, - .parent = TYPE_VIRTIO_DEVICE, - .instance_size = sizeof(VirtIOSerial), - .class_init = virtio_serial_class_init, - .interfaces = (InterfaceInfo[]) { - { TYPE_HOTPLUG_HANDLER }, - { } - } -}; - -static void virtio_serial_register_types(void) -{ - type_register_static(&virtser_bus_info); - type_register_static(&virtio_serial_port_type_info); - type_register_static(&virtio_device_info); -} - -type_init(virtio_serial_register_types) |