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1 /*
2 * vhost-scsi-common
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 #include "qapi/error.h"
20 #include "qemu/error-report.h"
21 #include "qemu/module.h"
22 #include "hw/virtio/vhost.h"
23 #include "hw/virtio/vhost-scsi-common.h"
24 #include "hw/virtio/virtio-scsi.h"
25 #include "hw/virtio/virtio-bus.h"
26 #include "hw/virtio/virtio-access.h"
27 #include "hw/core/fw-path-provider.h"
28
29 int vhost_scsi_common_start(VHostSCSICommon *vsc, Error **errp)
30 {
31 int ret, i;
32 VirtIODevice *vdev = VIRTIO_DEVICE(vsc);
33 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
34 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
35
36 VirtIOSCSICommon *vs = (VirtIOSCSICommon *)vsc;
37
38 if (!k->set_guest_notifiers) {
39 error_setg(errp, "binding does not support guest notifiers");
40 return -ENOSYS;
41 }
42
43 ret = vhost_dev_enable_notifiers(&vsc->dev, vdev);
44 if (ret < 0) {
45 error_setg_errno(errp, -ret, "Error enabling host notifiers");
46 return ret;
47 }
48
49 ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, true);
50 if (ret < 0) {
51 error_setg_errno(errp, -ret, "Error binding guest notifier");
52 goto err_host_notifiers;
53 }
54
55 vsc->dev.acked_features = vdev->guest_features;
56
57 ret = vhost_dev_prepare_inflight(&vsc->dev, vdev);
58 if (ret < 0) {
59 error_setg_errno(errp, -ret, "Error setting inflight format");
60 goto err_guest_notifiers;
61 }
62
63 if (vsc->inflight) {
64 if (!vsc->inflight->addr) {
65 ret = vhost_dev_get_inflight(&vsc->dev,
66 vs->conf.virtqueue_size,
67 vsc->inflight);
68 if (ret < 0) {
69 error_setg_errno(errp, -ret, "Error getting inflight");
70 goto err_guest_notifiers;
71 }
72 }
73
74 ret = vhost_dev_set_inflight(&vsc->dev, vsc->inflight);
75 if (ret < 0) {
76 error_setg_errno(errp, -ret, "Error setting inflight");
77 goto err_guest_notifiers;
78 }
79 }
80
81 ret = vhost_dev_start(&vsc->dev, vdev, true);
82 if (ret < 0) {
83 error_setg_errno(errp, -ret, "Error starting vhost dev");
84 goto err_guest_notifiers;
85 }
86
87 /* guest_notifier_mask/pending not used yet, so just unmask
88 * everything here. virtio-pci will do the right thing by
89 * enabling/disabling irqfd.
90 */
91 for (i = 0; i < vsc->dev.nvqs; i++) {
92 vhost_virtqueue_mask(&vsc->dev, vdev, vsc->dev.vq_index + i, false);
93 }
94
95 return ret;
96
97 err_guest_notifiers:
98 k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
99 err_host_notifiers:
100 vhost_dev_disable_notifiers(&vsc->dev, vdev);
101 return ret;
102 }
103
104 int vhost_scsi_common_stop(VHostSCSICommon *vsc)
105 {
106 VirtIODevice *vdev = VIRTIO_DEVICE(vsc);
107 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
108 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
109 int ret = 0;
110
111 ret = vhost_dev_stop(&vsc->dev, vdev, true);
112
113 if (k->set_guest_notifiers) {
114 int r = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
115 if (r < 0) {
116 error_report("vhost guest notifier cleanup failed: %d", r);
117 return r;
118 }
119 }
120
121 vhost_dev_disable_notifiers(&vsc->dev, vdev);
122 return ret;
123 }
124
125 uint64_t vhost_scsi_common_get_features(VirtIODevice *vdev, uint64_t features,
126 Error **errp)
127 {
128 VHostSCSICommon *vsc = VHOST_SCSI_COMMON(vdev);
129
130 /* Turn on predefined features supported by this device */
131 features |= vsc->host_features;
132
133 return vhost_get_features(&vsc->dev, vsc->feature_bits, features);
134 }
135
136 void vhost_scsi_common_set_config(VirtIODevice *vdev, const uint8_t *config)
137 {
138 VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
139 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
140
141 if ((uint32_t)virtio_ldl_p(vdev, &scsiconf->sense_size) != vs->sense_size ||
142 (uint32_t)virtio_ldl_p(vdev, &scsiconf->cdb_size) != vs->cdb_size) {
143 error_report("vhost-scsi does not support changing the sense data and "
144 "CDB sizes");
145 exit(1);
146 }
147 }
148
149 /*
150 * Implementation of an interface to adjust firmware path
151 * for the bootindex property handling.
152 */
153 char *vhost_scsi_common_get_fw_dev_path(FWPathProvider *p, BusState *bus,
154 DeviceState *dev)
155 {
156 VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev);
157 /* format: /channel@channel/vhost-scsi@target,lun */
158 return g_strdup_printf("/channel@%x/%s@%x,%x", vsc->channel,
159 qdev_fw_name(dev), vsc->target, vsc->lun);
160 }
161
162 static const TypeInfo vhost_scsi_common_info = {
163 .name = TYPE_VHOST_SCSI_COMMON,
164 .parent = TYPE_VIRTIO_SCSI_COMMON,
165 .instance_size = sizeof(VHostSCSICommon),
166 .abstract = true,
167 };
168
169 static void virtio_register_types(void)
170 {
171 type_register_static(&vhost_scsi_common_info);
172 }
173
174 type_init(virtio_register_types)