@samitouri / QOSamiQemu
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1 /*
2 * libqos driver framework
3 *
4 * Based on tests/qtest/libqos/virtio-blk.c
5 *
6 * Copyright (c) 2020 Coiby Xu <coiby.xu@gmail.com>
7 *
8 * Copyright (c) 2018 Emanuele Giuseppe Esposito <e.emanuelegiuseppe@gmail.com>
9 *
10 * This library is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License version 2.1 as published by the Free Software Foundation.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, see <http://www.gnu.org/licenses/>
21 */
22
23 #include "qemu/osdep.h"
24 #include "../libqtest.h"
25 #include "qemu/module.h"
26 #include "standard-headers/linux/virtio_blk.h"
27 #include "vhost-user-blk.h"
28
29 #define PCI_SLOT 0x04
30 #define PCI_FN 0x00
31
32 /* virtio-blk-device */
33 static void *qvhost_user_blk_get_driver(QVhostUserBlk *v_blk,
34 const char *interface)
35 {
36 if (!g_strcmp0(interface, "vhost-user-blk")) {
37 return v_blk;
38 }
39 if (!g_strcmp0(interface, "virtio")) {
40 return v_blk->vdev;
41 }
42
43 fprintf(stderr, "%s not present in vhost-user-blk-device\n", interface);
44 g_assert_not_reached();
45 }
46
47 static void *qvhost_user_blk_device_get_driver(void *object,
48 const char *interface)
49 {
50 QVhostUserBlkDevice *v_blk = object;
51 return qvhost_user_blk_get_driver(&v_blk->blk, interface);
52 }
53
54 static void *vhost_user_blk_device_create(void *virtio_dev,
55 QGuestAllocator *t_alloc,
56 void *addr)
57 {
58 QVhostUserBlkDevice *vhost_user_blk = g_new0(QVhostUserBlkDevice, 1);
59 QVhostUserBlk *interface = &vhost_user_blk->blk;
60
61 interface->vdev = virtio_dev;
62
63 vhost_user_blk->obj.get_driver = qvhost_user_blk_device_get_driver;
64
65 return &vhost_user_blk->obj;
66 }
67
68 /* virtio-blk-pci */
69 static void *qvhost_user_blk_pci_get_driver(void *object, const char *interface)
70 {
71 QVhostUserBlkPCI *v_blk = object;
72 if (!g_strcmp0(interface, "pci-device")) {
73 return v_blk->pci_vdev.pdev;
74 }
75 return qvhost_user_blk_get_driver(&v_blk->blk, interface);
76 }
77
78 static void *vhost_user_blk_pci_create(void *pci_bus, QGuestAllocator *t_alloc,
79 void *addr)
80 {
81 QVhostUserBlkPCI *vhost_user_blk = g_new0(QVhostUserBlkPCI, 1);
82 QVhostUserBlk *interface = &vhost_user_blk->blk;
83 QOSGraphObject *obj = &vhost_user_blk->pci_vdev.obj;
84
85 virtio_pci_init(&vhost_user_blk->pci_vdev, pci_bus, addr);
86 interface->vdev = &vhost_user_blk->pci_vdev.vdev;
87
88 g_assert_cmphex(interface->vdev->device_type, ==, VIRTIO_ID_BLOCK);
89
90 obj->get_driver = qvhost_user_blk_pci_get_driver;
91
92 return obj;
93 }
94
95 static void vhost_user_blk_register_nodes(void)
96 {
97 /*
98 * FIXME: every test using these two nodes needs to setup a
99 * -drive,id=drive0 otherwise QEMU is not going to start.
100 * Therefore, we do not include "produces" edge for virtio
101 * and pci-device yet.
102 */
103
104 char *arg = g_strdup_printf("id=drv0,chardev=char1,addr=%x.%x",
105 PCI_SLOT, PCI_FN);
106
107 QPCIAddress addr = {
108 .devfn = QPCI_DEVFN(PCI_SLOT, PCI_FN),
109 };
110
111 QOSGraphEdgeOptions opts = { };
112
113 /* virtio-blk-device */
114 /** opts.extra_device_opts = "drive=drive0"; */
115 qos_node_create_driver("vhost-user-blk-device",
116 vhost_user_blk_device_create);
117 qos_node_consumes("vhost-user-blk-device", "virtio-bus", &opts);
118 qos_node_produces("vhost-user-blk-device", "vhost-user-blk");
119
120 /* virtio-blk-pci */
121 opts.extra_device_opts = arg;
122 add_qpci_address(&opts, &addr);
123 qos_node_create_driver("vhost-user-blk-pci", vhost_user_blk_pci_create);
124 qos_node_consumes("vhost-user-blk-pci", "pci-bus", &opts);
125 qos_node_produces("vhost-user-blk-pci", "vhost-user-blk");
126
127 g_free(arg);
128 }
129
130 libqos_init(vhost_user_blk_register_nodes);