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