diff options
Diffstat (limited to 'src/hw/char/virtio-console.c')
| -rw-r--r-- | src/hw/char/virtio-console.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/src/hw/char/virtio-console.c b/src/hw/char/virtio-console.c new file mode 100644 index 0000000..2a867cb --- /dev/null +++ b/src/hw/char/virtio-console.c @@ -0,0 +1,217 @@ +/* + * Virtio Console and Generic Serial Port Devices + * + * Copyright Red Hat, Inc. 2009, 2010 + * + * Authors: + * Amit Shah <amit.shah@redhat.com> + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + */ + +#include "sysemu/char.h" +#include "qemu/error-report.h" +#include "trace.h" +#include "hw/virtio/virtio-serial.h" +#include "qapi-event.h" + +#define TYPE_VIRTIO_CONSOLE_SERIAL_PORT "virtserialport" +#define VIRTIO_CONSOLE(obj) \ + OBJECT_CHECK(VirtConsole, (obj), TYPE_VIRTIO_CONSOLE_SERIAL_PORT) + +typedef struct VirtConsole { + VirtIOSerialPort parent_obj; + + CharDriverState *chr; + guint watch; +} VirtConsole; + +/* + * Callback function that's called from chardevs when backend becomes + * writable. + */ +static gboolean chr_write_unblocked(GIOChannel *chan, GIOCondition cond, + void *opaque) +{ + VirtConsole *vcon = opaque; + + vcon->watch = 0; + virtio_serial_throttle_port(VIRTIO_SERIAL_PORT(vcon), false); + return FALSE; +} + +/* Callback function that's called when the guest sends us data */ +static ssize_t flush_buf(VirtIOSerialPort *port, + const uint8_t *buf, ssize_t len) +{ + VirtConsole *vcon = VIRTIO_CONSOLE(port); + ssize_t ret; + + if (!vcon->chr) { + /* If there's no backend, we can just say we consumed all data. */ + return len; + } + + ret = qemu_chr_fe_write(vcon->chr, buf, len); + trace_virtio_console_flush_buf(port->id, len, ret); + + if (ret < len) { + VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port); + + /* + * Ideally we'd get a better error code than just -1, but + * that's what the chardev interface gives us right now. If + * we had a finer-grained message, like -EPIPE, we could close + * this connection. + */ + if (ret < 0) + ret = 0; + if (!k->is_console) { + virtio_serial_throttle_port(port, true); + if (!vcon->watch) { + vcon->watch = qemu_chr_fe_add_watch(vcon->chr, + G_IO_OUT|G_IO_HUP, + chr_write_unblocked, vcon); + } + } + } + return ret; +} + +/* Callback function that's called when the guest opens/closes the port */ +static void set_guest_connected(VirtIOSerialPort *port, int guest_connected) +{ + VirtConsole *vcon = VIRTIO_CONSOLE(port); + DeviceState *dev = DEVICE(port); + + if (vcon->chr) { + qemu_chr_fe_set_open(vcon->chr, guest_connected); + } + + if (dev->id) { + qapi_event_send_vserport_change(dev->id, guest_connected, + &error_abort); + } +} + +static void guest_writable(VirtIOSerialPort *port) +{ + VirtConsole *vcon = VIRTIO_CONSOLE(port); + + if (vcon->chr) { + qemu_chr_accept_input(vcon->chr); + } +} + +/* Readiness of the guest to accept data on a port */ +static int chr_can_read(void *opaque) +{ + VirtConsole *vcon = opaque; + + return virtio_serial_guest_ready(VIRTIO_SERIAL_PORT(vcon)); +} + +/* Send data from a char device over to the guest */ +static void chr_read(void *opaque, const uint8_t *buf, int size) +{ + VirtConsole *vcon = opaque; + VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(vcon); + + trace_virtio_console_chr_read(port->id, size); + virtio_serial_write(port, buf, size); +} + +static void chr_event(void *opaque, int event) +{ + VirtConsole *vcon = opaque; + VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(vcon); + + trace_virtio_console_chr_event(port->id, event); + switch (event) { + case CHR_EVENT_OPENED: + virtio_serial_open(port); + break; + case CHR_EVENT_CLOSED: + if (vcon->watch) { + g_source_remove(vcon->watch); + vcon->watch = 0; + } + virtio_serial_close(port); + break; + } +} + +static void virtconsole_realize(DeviceState *dev, Error **errp) +{ + VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(dev); + VirtConsole *vcon = VIRTIO_CONSOLE(dev); + VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(dev); + + if (port->id == 0 && !k->is_console) { + error_setg(errp, "Port number 0 on virtio-serial devices reserved " + "for virtconsole devices for backward compatibility."); + return; + } + + if (vcon->chr) { + vcon->chr->explicit_fe_open = 1; + qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event, + vcon); + } +} + +static void virtconsole_unrealize(DeviceState *dev, Error **errp) +{ + VirtConsole *vcon = VIRTIO_CONSOLE(dev); + + if (vcon->watch) { + g_source_remove(vcon->watch); + } +} + +static void virtconsole_class_init(ObjectClass *klass, void *data) +{ + VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass); + + k->is_console = true; +} + +static const TypeInfo virtconsole_info = { + .name = "virtconsole", + .parent = TYPE_VIRTIO_CONSOLE_SERIAL_PORT, + .class_init = virtconsole_class_init, +}; + +static Property virtserialport_properties[] = { + DEFINE_PROP_CHR("chardev", VirtConsole, chr), + DEFINE_PROP_END_OF_LIST(), +}; + +static void virtserialport_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass); + + k->realize = virtconsole_realize; + k->unrealize = virtconsole_unrealize; + k->have_data = flush_buf; + k->set_guest_connected = set_guest_connected; + k->guest_writable = guest_writable; + dc->props = virtserialport_properties; +} + +static const TypeInfo virtserialport_info = { + .name = TYPE_VIRTIO_CONSOLE_SERIAL_PORT, + .parent = TYPE_VIRTIO_SERIAL_PORT, + .instance_size = sizeof(VirtConsole), + .class_init = virtserialport_class_init, +}; + +static void virtconsole_register_types(void) +{ + type_register_static(&virtserialport_info); + type_register_static(&virtconsole_info); +} + +type_init(virtconsole_register_types) |
