/* * Virtio Serial / Console Support * * Copyright IBM, Corp. 2008 * Copyright Red Hat, Inc. 2009, 2010 * * Authors: * Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> * 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. * */ #ifndef _QEMU_VIRTIO_SERIAL_H #define _QEMU_VIRTIO_SERIAL_H #include "qdev.h" #include "virtio.h" /* == Interface shared between the guest kernel and qemu == */ /* The Virtio ID for virtio console / serial ports */ #define VIRTIO_ID_CONSOLE 3 /* Features supported */ #define VIRTIO_CONSOLE_F_MULTIPORT 1 #define VIRTIO_CONSOLE_BAD_ID (~(uint32_t)0) struct virtio_console_config { /* * These two fields are used by VIRTIO_CONSOLE_F_SIZE which * isn't implemented here yet */ uint16_t cols; uint16_t rows; uint32_t max_nr_ports; } QEMU_PACKED; struct virtio_console_control { uint32_t id; /* Port number */ uint16_t event; /* The kind of control event (see below) */ uint16_t value; /* Extra information for the key */ }; struct virtio_serial_conf { /* Max. number of ports we can have for a virtio-serial device */ uint32_t max_virtserial_ports; }; /* Some events for the internal messages (control packets) */ #define VIRTIO_CONSOLE_DEVICE_READY 0 #define VIRTIO_CONSOLE_PORT_ADD 1 #define VIRTIO_CONSOLE_PORT_REMOVE 2 #define VIRTIO_CONSOLE_PORT_READY 3 #define VIRTIO_CONSOLE_CONSOLE_PORT 4 #define VIRTIO_CONSOLE_RESIZE 5 #define VIRTIO_CONSOLE_PORT_OPEN 6 #define VIRTIO_CONSOLE_PORT_NAME 7 /* == In-qemu interface == */ #define TYPE_VIRTIO_SERIAL_PORT "virtio-serial-port" #define VIRTIO_SERIAL_PORT(obj) \ OBJECT_CHECK(VirtIOSerialPort, (obj), TYPE_VIRTIO_SERIAL_PORT) #define VIRTIO_SERIAL_PORT_CLASS(klass) \ OBJECT_CLASS_CHECK(VirtIOSerialPortClass, (klass), TYPE_VIRTIO_SERIAL_PORT) #define VIRTIO_SERIAL_PORT_GET_CLASS(obj) \ OBJECT_GET_CLASS(VirtIOSerialPortClass, (obj), TYPE_VIRTIO_SERIAL_PORT) typedef struct VirtIOSerial VirtIOSerial; typedef struct VirtIOSerialBus VirtIOSerialBus; typedef struct VirtIOSerialPort VirtIOSerialPort; typedef struct VirtIOSerialPortClass { DeviceClass parent_class; /* Is this a device that binds with hvc in the guest? */ bool is_console; /* * The per-port (or per-app) init function that's called when a * new device is found on the bus. */ int (*init)(VirtIOSerialPort *port); /* * Per-port exit function that's called when a port gets * hot-unplugged or removed. */ int (*exit)(VirtIOSerialPort *port); /* Callbacks for guest events */ /* Guest opened device. */ void (*guest_open)(VirtIOSerialPort *port); /* Guest closed device. */ void (*guest_close)(VirtIOSerialPort *port); /* Guest is now ready to accept data (virtqueues set up). */ void (*guest_ready)(VirtIOSerialPort *port); /* * Guest wrote some data to the port. This data is handed over to * the app via this callback. The app can return a size less than * 'len'. In this case, throttling will be enabled for this port. */ ssize_t (*have_data)(VirtIOSerialPort *port, const uint8_t *buf, size_t len); } VirtIOSerialPortClass; /* * This is the state that's shared between all the ports. Some of the * state is configurable via command-line options. Some of it can be * set by individual devices in their initfn routines. Some of the * state is set by the generic qdev device init routine. */ struct VirtIOSerialPort { DeviceState dev; QTAILQ_ENTRY(VirtIOSerialPort) next; /* * This field gives us the virtio device as well as the qdev bus * that we are associated with */ VirtIOSerial *vser; VirtQueue *ivq, *ovq; /* * This name is sent to the guest and exported via sysfs. * The guest could create symlinks based on this information. * The name is in the reverse fqdn format, like org.qemu.console.0 */ char *name; /* * This id helps identify ports between the guest and the host. * The guest sends a "header" with this id with each data packet * that it sends and the host can then find out which associated * device to send out this data to */ uint32_t id; /* * This is the elem that we pop from the virtqueue. A slow * backend that consumes guest data (e.g. the file backend for * qemu chardevs) can cause the guest to block till all the output * is flushed. This isn't desired, so we keep a note of the last * element popped and continue consuming it once the backend * becomes writable again. */ VirtQueueElement elem; /* * The index and the offset into the iov buffer that was popped in * elem above. */ uint32_t iov_idx; uint64_t iov_offset; /* * When unthrottling we use a bottom-half to call flush_queued_data. */ QEMUBH *bh; /* Is the corresponding guest device open? */ bool guest_connected; /* Is this device open for IO on the host? */ bool host_connected; /* Do apps not want to receive data? */ bool throttled; }; /* Interface to the virtio-serial bus */ /* * Open a connection to the port * Returns 0 on success (always). */ int virtio_serial_open(VirtIOSerialPort *port); /* * Close the connection to the port * Returns 0 on success (always). */ int virtio_serial_close(VirtIOSerialPort *port); /* * Send data to Guest */ ssize_t virtio_serial_write(VirtIOSerialPort *port, const uint8_t *buf, size_t size); /* * Query whether a guest is ready to receive data. */ size_t virtio_serial_guest_ready(VirtIOSerialPort *port); /* * Flow control: Ports can signal to the virtio-serial core to stop * sending data or re-start sending data, depending on the 'throttle' * value here. */ void virtio_serial_throttle_port(VirtIOSerialPort *port, bool throttle); #endif