xref: /qemu/hw/virtio/virtio-blk-pci.c (revision e3a6e0da) 
1 /*
2  * Virtio blk PCI Bindings
3  *
4  * Copyright IBM, Corp. 2007
5  * Copyright (c) 2009 CodeSourcery
6  *
7  * Authors:
8  *  Anthony Liguori   <aliguori@us.ibm.com>
9  *  Paul Brook        <paul@codesourcery.com>
10  *
11  * This work is licensed under the terms of the GNU GPL, version 2.  See
12  * the COPYING file in the top-level directory.
13  *
14  * Contributions after 2012-01-13 are licensed under the terms of the
15  * GNU GPL, version 2 or (at your option) any later version.
16  */
17 
18 #include "qemu/osdep.h"
19 
20 #include "hw/qdev-properties.h"
21 #include "hw/virtio/virtio-blk.h"
22 #include "virtio-pci.h"
23 #include "qapi/error.h"
24 #include "qemu/module.h"
25 #include "qom/object.h"
26 
27 typedef struct VirtIOBlkPCI VirtIOBlkPCI;
28 
29 /*
30  * virtio-blk-pci: This extends VirtioPCIProxy.
31  */
32 #define TYPE_VIRTIO_BLK_PCI "virtio-blk-pci-base"
33 DECLARE_INSTANCE_CHECKER(VirtIOBlkPCI, VIRTIO_BLK_PCI,
34                          TYPE_VIRTIO_BLK_PCI)
35 
36 struct VirtIOBlkPCI {
37     VirtIOPCIProxy parent_obj;
38     VirtIOBlock vdev;
39 };
40 
41 static Property virtio_blk_pci_properties[] = {
42     DEFINE_PROP_UINT32("class", VirtIOPCIProxy, class_code, 0),
43     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
44                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
45     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
46                        DEV_NVECTORS_UNSPECIFIED),
47     DEFINE_PROP_END_OF_LIST(),
48 };
49 
50 static void virtio_blk_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
51 {
52     VirtIOBlkPCI *dev = VIRTIO_BLK_PCI(vpci_dev);
53     DeviceState *vdev = DEVICE(&dev->vdev);
54     VirtIOBlkConf *conf = &dev->vdev.conf;
55 
56     if (conf->num_queues == VIRTIO_BLK_AUTO_NUM_QUEUES) {
57         conf->num_queues = virtio_pci_optimal_num_queues(0);
58     }
59 
60     if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
61         vpci_dev->nvectors = conf->num_queues + 1;
62     }
63 
64     qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
65 }
66 
67 static void virtio_blk_pci_class_init(ObjectClass *klass, void *data)
68 {
69     DeviceClass *dc = DEVICE_CLASS(klass);
70     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
71     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
72 
73     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
74     device_class_set_props(dc, virtio_blk_pci_properties);
75     k->realize = virtio_blk_pci_realize;
76     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
77     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_BLOCK;
78     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
79     pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
80 }
81 
82 static void virtio_blk_pci_instance_init(Object *obj)
83 {
84     VirtIOBlkPCI *dev = VIRTIO_BLK_PCI(obj);
85 
86     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
87                                 TYPE_VIRTIO_BLK);
88     object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
89                               "bootindex");
90 }
91 
92 static const VirtioPCIDeviceTypeInfo virtio_blk_pci_info = {
93     .base_name              = TYPE_VIRTIO_BLK_PCI,
94     .generic_name           = "virtio-blk-pci",
95     .transitional_name      = "virtio-blk-pci-transitional",
96     .non_transitional_name  = "virtio-blk-pci-non-transitional",
97     .instance_size = sizeof(VirtIOBlkPCI),
98     .instance_init = virtio_blk_pci_instance_init,
99     .class_init    = virtio_blk_pci_class_init,
100 };
101 
102 static void virtio_blk_pci_register(void)
103 {
104     virtio_pci_types_register(&virtio_blk_pci_info);
105 }
106 
107 type_init(virtio_blk_pci_register)
108