diff options
Diffstat (limited to 'hw/char/virtio-console.c')
| -rw-r--r-- | hw/char/virtio-console.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/hw/char/virtio-console.c b/hw/char/virtio-console.c new file mode 100644 index 0000000000..31f672c9a3 --- /dev/null +++ b/hw/char/virtio-console.c @@ -0,0 +1,184 @@ +/* + * 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 "char/char.h" +#include "qemu/error-report.h" +#include "trace.h" +#include "hw/virtio/virtio-serial.h" + +typedef struct VirtConsole { + VirtIOSerialPort port; + CharDriverState *chr; +} 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; + + virtio_serial_throttle_port(&vcon->port, 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, size_t len) +{ + VirtConsole *vcon = DO_UPCAST(VirtConsole, port, 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 <= 0) { + 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. + */ + ret = 0; + if (!k->is_console) { + virtio_serial_throttle_port(port, true); + qemu_chr_fe_add_watch(vcon->chr, G_IO_OUT, 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 = DO_UPCAST(VirtConsole, port, port); + + if (!vcon->chr) { + return; + } + qemu_chr_fe_set_open(vcon->chr, guest_connected); +} + +/* 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(&vcon->port); +} + +/* 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; + + trace_virtio_console_chr_read(vcon->port.id, size); + virtio_serial_write(&vcon->port, buf, size); +} + +static void chr_event(void *opaque, int event) +{ + VirtConsole *vcon = opaque; + + trace_virtio_console_chr_event(vcon->port.id, event); + switch (event) { + case CHR_EVENT_OPENED: + virtio_serial_open(&vcon->port); + break; + case CHR_EVENT_CLOSED: + virtio_serial_close(&vcon->port); + break; + } +} + +static int virtconsole_initfn(VirtIOSerialPort *port) +{ + VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); + VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port); + + if (port->id == 0 && !k->is_console) { + error_report("Port number 0 on virtio-serial devices reserved for virtconsole devices for backward compatibility."); + return -1; + } + + if (vcon->chr) { + vcon->chr->explicit_fe_open = 1; + qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event, + vcon); + } + + return 0; +} + +static Property virtconsole_properties[] = { + DEFINE_PROP_CHR("chardev", VirtConsole, chr), + DEFINE_PROP_END_OF_LIST(), +}; + +static void virtconsole_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass); + + k->is_console = true; + k->init = virtconsole_initfn; + k->have_data = flush_buf; + k->set_guest_connected = set_guest_connected; + dc->props = virtconsole_properties; +} + +static const TypeInfo virtconsole_info = { + .name = "virtconsole", + .parent = TYPE_VIRTIO_SERIAL_PORT, + .instance_size = sizeof(VirtConsole), + .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->init = virtconsole_initfn; + k->have_data = flush_buf; + k->set_guest_connected = set_guest_connected; + dc->props = virtserialport_properties; +} + +static const TypeInfo virtserialport_info = { + .name = "virtserialport", + .parent = TYPE_VIRTIO_SERIAL_PORT, + .instance_size = sizeof(VirtConsole), + .class_init = virtserialport_class_init, +}; + +static void virtconsole_register_types(void) +{ + type_register_static(&virtconsole_info); + type_register_static(&virtserialport_info); +} + +type_init(virtconsole_register_types) |