tests/libqos: virtio-serial driver and interface nodes

Add qgraph nodes for virtio-serial-pci and virtio-serial-device.
Both nodes produce virtio-serial, but virtio-serial-pci receives
a pci-bus and uses virtio-pci QOSGraphObject and functions,
while virtio-serial-device receives a virtio-bus and implements
its own functions

Signed-off-by: Emanuele Giuseppe Esposito <e.emanuelegiuseppe@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tests/Makefile.include

@@ -751,6 +751,7 @@ qos-test-obj-y += $(libqos-pc-obj-y) $(libqos-spapr-obj-y)
 qos-test-obj-y += tests/libqos/e1000e.o
 qos-test-obj-y += tests/libqos/sdhci.o
 qos-test-obj-y += $(libqos-virtio-obj-y)
+qos-test-obj-y += tests/libqos/virtio-serial.o
 
 # Machines
 qos-test-obj-y += tests/libqos/aarch64-xlnx-zcu102-machine.o

tests/libqos/virtio-serial.c

@@ -0,0 +1,110 @@
+/*
+ * libqos driver framework
+ *
+ * Copyright (c) 2018 Emanuele Giuseppe Esposito <e.emanuelegiuseppe@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2 as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>
+ */
+
+#include "qemu/osdep.h"
+#include "libqtest.h"
+#include "libqos/qgraph.h"
+#include "libqos/virtio-serial.h"
+
+static void *qvirtio_serial_get_driver(QVirtioSerial *v_serial,
+                                       const char *interface)
+{
+    if (!g_strcmp0(interface, "virtio-serial")) {
+        return v_serial;
+    }
+    if (!g_strcmp0(interface, "virtio")) {
+        return v_serial->vdev;
+    }
+
+    fprintf(stderr, "%s not present in virtio-serial-device\n", interface);
+    g_assert_not_reached();
+}
+
+static void *qvirtio_serial_device_get_driver(void *object,
+                                              const char *interface)
+{
+    QVirtioSerialDevice *v_serial = object;
+    return qvirtio_serial_get_driver(&v_serial->serial, interface);
+}
+
+static void *virtio_serial_device_create(void *virtio_dev,
+                                         QGuestAllocator *t_alloc,
+                                         void *addr)
+{
+    QVirtioSerialDevice *virtio_device = g_new0(QVirtioSerialDevice, 1);
+    QVirtioSerial *interface = &virtio_device->serial;
+
+    interface->vdev = virtio_dev;
+
+    virtio_device->obj.get_driver = qvirtio_serial_device_get_driver;
+
+    return &virtio_device->obj;
+}
+
+/* virtio-serial-pci */
+static void *qvirtio_serial_pci_get_driver(void *object, const char *interface)
+{
+    QVirtioSerialPCI *v_serial = object;
+    if (!g_strcmp0(interface, "pci-device")) {
+        return v_serial->pci_vdev.pdev;
+    }
+    return qvirtio_serial_get_driver(&v_serial->serial, interface);
+}
+
+static void *virtio_serial_pci_create(void *pci_bus, QGuestAllocator *t_alloc,
+                                      void *addr)
+{
+    QVirtioSerialPCI *virtio_spci = g_new0(QVirtioSerialPCI, 1);
+    QVirtioSerial *interface = &virtio_spci->serial;
+    QOSGraphObject *obj = &virtio_spci->pci_vdev.obj;
+
+    virtio_pci_init(&virtio_spci->pci_vdev, pci_bus, addr);
+    interface->vdev = &virtio_spci->pci_vdev.vdev;
+
+    obj->get_driver = qvirtio_serial_pci_get_driver;
+
+    return obj;
+}
+
+static void virtio_serial_register_nodes(void)
+{
+   QPCIAddress addr = {
+        .devfn = QPCI_DEVFN(4, 0),
+    };
+
+    QOSGraphEdgeOptions edge_opts = { };
+
+    /* virtio-serial-device */
+    edge_opts.extra_device_opts = "id=vser0";
+    qos_node_create_driver("virtio-serial-device",
+                            virtio_serial_device_create);
+    qos_node_consumes("virtio-serial-device", "virtio-bus", &edge_opts);
+    qos_node_produces("virtio-serial-device", "virtio");
+    qos_node_produces("virtio-serial-device", "virtio-serial");
+
+    /* virtio-serial-pci */
+    edge_opts.extra_device_opts = "id=vser0,addr=04.0";
+    add_qpci_address(&edge_opts, &addr);
+    qos_node_create_driver("virtio-serial-pci", virtio_serial_pci_create);
+    qos_node_consumes("virtio-serial-pci", "pci-bus", &edge_opts);
+    qos_node_produces("virtio-serial-pci", "pci-device");
+    qos_node_produces("virtio-serial-pci", "virtio");
+    qos_node_produces("virtio-serial-pci", "virtio-serial");
+}
+
+libqos_init(virtio_serial_register_nodes);

tests/libqos/virtio-serial.h

@@ -0,0 +1,39 @@
+/*
+ * libqos driver framework
+ *
+ * Copyright (c) 2018 Emanuele Giuseppe Esposito <e.emanuelegiuseppe@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2 as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>
+ */
+
+#include "libqos/qgraph.h"
+#include "libqos/virtio.h"
+#include "libqos/virtio-pci.h"
+
+typedef struct QVirtioSerial QVirtioSerial;
+typedef struct QVirtioSerialPCI QVirtioSerialPCI;
+typedef struct QVirtioSerialDevice QVirtioSerialDevice;
+
+struct QVirtioSerial {
+    QVirtioDevice *vdev;
+};
+
+struct QVirtioSerialPCI {
+    QVirtioPCIDevice pci_vdev;
+    QVirtioSerial serial;
+};
+
+struct QVirtioSerialDevice {
+    QOSGraphObject obj;
+    QVirtioSerial serial;
+};