/*
- * Virtio Console Device
+ * Virtio Console and Generic Serial Port Devices
*
- * 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.
- *
*/
-#include "hw.h"
#include "qemu-char.h"
-#include "virtio.h"
-#include "virtio-console.h"
-
+#include "qemu/error-report.h"
+#include "trace.h"
+#include "virtio-serial.h"
-typedef struct VirtIOConsole
-{
- VirtIODevice vdev;
- VirtQueue *ivq, *dvq;
+typedef struct VirtConsole {
+ VirtIOSerialPort port;
CharDriverState *chr;
-} VirtIOConsole;
+} VirtConsole;
-static VirtIOConsole *to_virtio_console(VirtIODevice *vdev)
-{
- return (VirtIOConsole *)vdev;
-}
-static void virtio_console_handle_output(VirtIODevice *vdev, VirtQueue *vq)
+/* 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)
{
- VirtIOConsole *s = to_virtio_console(vdev);
- VirtQueueElement elem;
+ VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
+ ssize_t ret;
- while (virtqueue_pop(vq, &elem)) {
- ssize_t len = 0;
- int d;
+ if (!vcon->chr) {
+ /* If there's no backend, we can just say we consumed all data. */
+ return len;
+ }
- for (d=0; d < elem.out_num; d++)
- len += qemu_chr_write(s->chr, elem.out_sg[d].iov_base,elem.out_sg[d].iov_len);
- virtqueue_push(vq, &elem, len);
- virtio_notify(vdev, vq);
+ ret = qemu_chr_fe_write(vcon->chr, buf, len);
+ trace_virtio_console_flush_buf(port->id, len, ret);
+
+ if (ret < 0) {
+ /*
+ * 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. Absent such error messages, the most we
+ * can do is to return 0 here.
+ *
+ * This will prevent stray -1 values to go to
+ * virtio-serial-bus.c and cause abort()s in
+ * do_flush_queued_data().
+ */
+ ret = 0;
}
+ return ret;
}
-static void virtio_console_handle_input(VirtIODevice *vdev, VirtQueue *vq)
+/* Callback function that's called when the guest opens the port */
+static void guest_open(VirtIOSerialPort *port)
{
-}
+ VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
-static uint32_t virtio_console_get_features(VirtIODevice *vdev)
-{
- return 0;
+ if (!vcon->chr) {
+ return;
+ }
+ qemu_chr_fe_open(vcon->chr);
}
-static int vcon_can_read(void *opaque)
+/* Callback function that's called when the guest closes the port */
+static void guest_close(VirtIOSerialPort *port)
{
- VirtIOConsole *s = (VirtIOConsole *) opaque;
-
- if (!virtio_queue_ready(s->ivq) ||
- !(s->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK) ||
- virtio_queue_empty(s->ivq))
- return 0;
-
- /* current implementations have a page sized buffer.
- * We fall back to a one byte per read if there is not enough room.
- * It would be cool to have a function that returns the available byte
- * instead of checking for a limit */
- if (virtqueue_avail_bytes(s->ivq, TARGET_PAGE_SIZE, 0))
- return TARGET_PAGE_SIZE;
- if (virtqueue_avail_bytes(s->ivq, 1, 0))
- return 1;
- return 0;
-}
+ VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
-static void vcon_read(void *opaque, const uint8_t *buf, int size)
-{
- VirtIOConsole *s = (VirtIOConsole *) opaque;
- VirtQueueElement elem;
- int offset = 0;
-
- /* The current kernel implementation has only one outstanding input
- * buffer of PAGE_SIZE. Nevertheless, this function is prepared to
- * handle multiple buffers with multiple sg element for input */
- while (offset < size) {
- int i = 0;
- if (!virtqueue_pop(s->ivq, &elem))
- break;
- while (offset < size && i < elem.in_num) {
- int len = MIN(elem.in_sg[i].iov_len, size - offset);
- memcpy(elem.in_sg[i].iov_base, buf + offset, len);
- offset += len;
- i++;
- }
- virtqueue_push(s->ivq, &elem, size);
+ if (!vcon->chr) {
+ return;
}
- virtio_notify(&s->vdev, s->ivq);
+ qemu_chr_fe_close(vcon->chr);
}
-static void vcon_event(void *opaque, int event)
+/* Readiness of the guest to accept data on a port */
+static int chr_can_read(void *opaque)
{
- /* we will ignore any event for the time being */
+ VirtConsole *vcon = opaque;
+
+ return virtio_serial_guest_ready(&vcon->port);
}
-static void virtio_console_save(QEMUFile *f, void *opaque)
+/* Send data from a char device over to the guest */
+static void chr_read(void *opaque, const uint8_t *buf, int size)
{
- VirtIOConsole *s = opaque;
+ VirtConsole *vcon = opaque;
- virtio_save(&s->vdev, f);
+ trace_virtio_console_chr_read(vcon->port.id, size);
+ virtio_serial_write(&vcon->port, buf, size);
}
-static int virtio_console_load(QEMUFile *f, void *opaque, int version_id)
+static void chr_event(void *opaque, int event)
{
- VirtIOConsole *s = opaque;
+ 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 (version_id != 1)
- return -EINVAL;
+ 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) {
+ qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event,
+ vcon);
+ }
- virtio_load(&s->vdev, f);
return 0;
}
-void *virtio_console_init(PCIBus *bus, CharDriverState *chr)
-{
- VirtIOConsole *s;
+static Property virtconsole_properties[] = {
+ DEFINE_PROP_CHR("chardev", VirtConsole, chr),
+ DEFINE_PROP_END_OF_LIST(),
+};
- s = (VirtIOConsole *)virtio_init_pci(bus, "virtio-console",
- 6900, 0x1003,
- 0, VIRTIO_ID_CONSOLE,
- 0x03, 0x80, 0x00,
- 0, sizeof(VirtIOConsole));
- if (s == NULL)
- return NULL;
+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->guest_open = guest_open;
+ k->guest_close = guest_close;
+ dc->props = virtconsole_properties;
+}
- s->vdev.get_features = virtio_console_get_features;
+static TypeInfo virtconsole_info = {
+ .name = "virtconsole",
+ .parent = TYPE_VIRTIO_SERIAL_PORT,
+ .instance_size = sizeof(VirtConsole),
+ .class_init = virtconsole_class_init,
+};
- s->ivq = virtio_add_queue(&s->vdev, 128, virtio_console_handle_input);
- s->dvq = virtio_add_queue(&s->vdev, 128, virtio_console_handle_output);
+static Property virtserialport_properties[] = {
+ DEFINE_PROP_CHR("chardev", VirtConsole, chr),
+ DEFINE_PROP_END_OF_LIST(),
+};
- s->chr = chr;
- qemu_chr_add_handlers(chr, vcon_can_read, vcon_read, vcon_event, s);
+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->guest_open = guest_open;
+ k->guest_close = guest_close;
+ dc->props = virtserialport_properties;
+}
- register_savevm("virtio-console", -1, 1, virtio_console_save, virtio_console_load, s);
+static TypeInfo virtserialport_info = {
+ .name = "virtserialport",
+ .parent = TYPE_VIRTIO_SERIAL_PORT,
+ .instance_size = sizeof(VirtConsole),
+ .class_init = virtserialport_class_init,
+};
- return &s->vdev;
+static void virtconsole_register_types(void)
+{
+ type_register_static(&virtconsole_info);
+ type_register_static(&virtserialport_info);
}
+
+type_init(virtconsole_register_types)
projects / qemu.git / blobdiff