1 /*
2  * Vhost user scsi PCI Bindings
3  *
4  * Copyright (c) 2016 Nutanix Inc. All rights reserved.
5  *
6  * Author:
7  *  Felipe Franciosi <felipe@nutanix.com>
8  *
9  * This work is largely based on the "vhost-scsi" implementation by:
10  *  Stefan Hajnoczi    <stefanha@linux.vnet.ibm.com>
11  *  Nicholas Bellinger <nab@risingtidesystems.com>
12  *
13  * This work is licensed under the terms of the GNU LGPL, version 2 or later.
14  * See the COPYING.LIB file in the top-level directory.
15  *
16  */
17 
18 #include "qemu/osdep.h"
19 
20 #include "standard-headers/linux/virtio_pci.h"
21 #include "hw/virtio/vhost-user-scsi.h"
22 #include "hw/virtio/virtio.h"
23 #include "hw/virtio/virtio-scsi.h"
24 #include "hw/pci/pci.h"
25 #include "hw/qdev-properties.h"
26 #include "qapi/error.h"
27 #include "qemu/error-report.h"
28 #include "qemu/module.h"
29 #include "hw/pci/msi.h"
30 #include "hw/pci/msix.h"
31 #include "hw/loader.h"
32 #include "sysemu/kvm.h"
33 #include "hw/virtio/virtio-pci.h"
34 #include "qom/object.h"
35 
36 typedef struct VHostUserSCSIPCI VHostUserSCSIPCI;
37 
38 #define TYPE_VHOST_USER_SCSI_PCI "vhost-user-scsi-pci-base"
39 DECLARE_INSTANCE_CHECKER(VHostUserSCSIPCI, VHOST_USER_SCSI_PCI,
40                          TYPE_VHOST_USER_SCSI_PCI)
41 
42 struct VHostUserSCSIPCI {
43     VirtIOPCIProxy parent_obj;
44     VHostUserSCSI vdev;
45 };
46 
47 static Property vhost_user_scsi_pci_properties[] = {
48     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
49                        DEV_NVECTORS_UNSPECIFIED),
50     DEFINE_PROP_END_OF_LIST(),
51 };
52 
53 static void vhost_user_scsi_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
54 {
55     VHostUserSCSIPCI *dev = VHOST_USER_SCSI_PCI(vpci_dev);
56     DeviceState *vdev = DEVICE(&dev->vdev);
57     VirtIOSCSIConf *conf = &dev->vdev.parent_obj.parent_obj.conf;
58 
59     if (conf->num_queues == VIRTIO_SCSI_AUTO_NUM_QUEUES) {
60         conf->num_queues =
61             virtio_pci_optimal_num_queues(VIRTIO_SCSI_VQ_NUM_FIXED);
62     }
63 
64     if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
65         vpci_dev->nvectors = conf->num_queues + VIRTIO_SCSI_VQ_NUM_FIXED + 1;
66     }
67 
68     qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
69 }
70 
71 static void vhost_user_scsi_pci_class_init(ObjectClass *klass, void *data)
72 {
73     DeviceClass *dc = DEVICE_CLASS(klass);
74     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
75     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
76     k->realize = vhost_user_scsi_pci_realize;
77     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
78     device_class_set_props(dc, vhost_user_scsi_pci_properties);
79     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
80     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
81     pcidev_k->revision = 0x00;
82     pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
83 }
84 
85 static void vhost_user_scsi_pci_instance_init(Object *obj)
86 {
87     VHostUserSCSIPCI *dev = VHOST_USER_SCSI_PCI(obj);
88 
89     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
90                                 TYPE_VHOST_USER_SCSI);
91     object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
92                               "bootindex");
93 }
94 
95 static const VirtioPCIDeviceTypeInfo vhost_user_scsi_pci_info = {
96     .base_name             = TYPE_VHOST_USER_SCSI_PCI,
97     .generic_name          = "vhost-user-scsi-pci",
98     .transitional_name     = "vhost-user-scsi-pci-transitional",
99     .non_transitional_name = "vhost-user-scsi-pci-non-transitional",
100     .instance_size = sizeof(VHostUserSCSIPCI),
101     .instance_init = vhost_user_scsi_pci_instance_init,
102     .class_init    = vhost_user_scsi_pci_class_init,
103 };
104 
105 static void vhost_user_scsi_pci_register(void)
106 {
107     virtio_pci_types_register(&vhost_user_scsi_pci_info);
108 }
109 
110 type_init(vhost_user_scsi_pci_register)
111