tests/libqos: virtio-scsi driver and interface nodes

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

@@ -743,6 +743,7 @@ qos-test-obj-y += tests/libqos/virtio-balloon.o
 qos-test-obj-y += tests/libqos/virtio-blk.o
 qos-test-obj-y += tests/libqos/virtio-net.o
 qos-test-obj-y += tests/libqos/virtio-rng.o
+qos-test-obj-y += tests/libqos/virtio-scsi.o
 qos-test-obj-y += tests/libqos/virtio-serial.o
 
 # Machines

tests/libqos/virtio-scsi.c

@@ -0,0 +1,117 @@
+/*
+ * 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 "standard-headers/linux/virtio_ids.h"
+#include "libqos/qgraph.h"
+#include "libqos/virtio-scsi.h"
+
+/* virtio-scsi-device */
+static void *qvirtio_scsi_get_driver(QVirtioSCSI *v_scsi,
+                                     const char *interface)
+{
+    if (!g_strcmp0(interface, "virtio-scsi")) {
+        return v_scsi;
+    }
+    if (!g_strcmp0(interface, "virtio")) {
+        return v_scsi->vdev;
+    }
+
+    fprintf(stderr, "%s not present in virtio-scsi-device\n", interface);
+    g_assert_not_reached();
+}
+
+static void *qvirtio_scsi_device_get_driver(void *object,
+                                            const char *interface)
+{
+    QVirtioSCSIDevice *v_scsi = object;
+    return qvirtio_scsi_get_driver(&v_scsi->scsi, interface);
+}
+
+static void *virtio_scsi_device_create(void *virtio_dev,
+                                          QGuestAllocator *t_alloc,
+                                          void *addr)
+{
+    QVirtioSCSIDevice *virtio_bdevice = g_new0(QVirtioSCSIDevice, 1);
+    QVirtioSCSI *interface = &virtio_bdevice->scsi;
+
+    interface->vdev = virtio_dev;
+
+    virtio_bdevice->obj.get_driver = qvirtio_scsi_device_get_driver;
+
+    return &virtio_bdevice->obj;
+}
+
+/* virtio-scsi-pci */
+static void *qvirtio_scsi_pci_get_driver(void *object,
+                                         const char *interface)
+{
+    QVirtioSCSIPCI *v_scsi = object;
+    if (!g_strcmp0(interface, "pci-device")) {
+        return v_scsi->pci_vdev.pdev;
+    }
+    return qvirtio_scsi_get_driver(&v_scsi->scsi, interface);
+}
+
+static void *virtio_scsi_pci_create(void *pci_bus,
+                                    QGuestAllocator *t_alloc,
+                                    void *addr)
+{
+    QVirtioSCSIPCI *virtio_spci = g_new0(QVirtioSCSIPCI, 1);
+    QVirtioSCSI *interface = &virtio_spci->scsi;
+    QOSGraphObject *obj = &virtio_spci->pci_vdev.obj;
+
+    virtio_pci_init(&virtio_spci->pci_vdev, pci_bus, addr);
+    interface->vdev = &virtio_spci->pci_vdev.vdev;
+
+    g_assert_cmphex(interface->vdev->device_type, ==, VIRTIO_ID_SCSI);
+
+    obj->get_driver = qvirtio_scsi_pci_get_driver;
+
+    return obj;
+}
+
+static void virtio_scsi_register_nodes(void)
+{
+    QPCIAddress addr = {
+        .devfn = QPCI_DEVFN(4, 0),
+    };
+
+    QOSGraphEdgeOptions opts = {
+        .before_cmd_line = "-drive id=drv0,if=none,file=null-co://,format=raw",
+        .after_cmd_line = "-device scsi-hd,bus=vs0.0,drive=drv0",
+    };
+
+    /* virtio-scsi-device */
+    opts.extra_device_opts = "id=vs0";
+    qos_node_create_driver("virtio-scsi-device",
+                            virtio_scsi_device_create);
+    qos_node_consumes("virtio-scsi-device", "virtio-bus", &opts);
+    qos_node_produces("virtio-scsi-device", "virtio-scsi");
+
+    /* virtio-scsi-pci */
+    opts.extra_device_opts = "id=vs0,addr=04.0";
+    add_qpci_address(&opts, &addr);
+    qos_node_create_driver("virtio-scsi-pci", virtio_scsi_pci_create);
+    qos_node_consumes("virtio-scsi-pci", "pci-bus", &opts);
+    qos_node_produces("virtio-scsi-pci", "pci-device");
+    qos_node_produces("virtio-scsi-pci", "virtio-scsi");
+}
+
+libqos_init(virtio_scsi_register_nodes);

tests/libqos/virtio-scsi.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 QVirtioSCSI QVirtioSCSI;
+typedef struct QVirtioSCSIPCI QVirtioSCSIPCI;
+typedef struct QVirtioSCSIDevice QVirtioSCSIDevice;
+
+struct QVirtioSCSI {
+    QVirtioDevice *vdev;
+};
+
+struct QVirtioSCSIPCI {
+    QVirtioPCIDevice pci_vdev;
+    QVirtioSCSI scsi;
+};
+
+struct QVirtioSCSIDevice {
+    QOSGraphObject obj;
+    QVirtioSCSI scsi;
+};