Merge tag 'pull-request-2022-05-18' of https://gitlab.com/thuth/qemu into staging
[qemu.git] / hw / scsi / vhost-scsi-common.c
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 "qemu/error-report.h"
20 #include "qemu/module.h"
21 #include "hw/virtio/vhost.h"
22 #include "hw/virtio/vhost-scsi-common.h"
23 #include "hw/virtio/virtio-scsi.h"
24 #include "hw/virtio/virtio-bus.h"
25 #include "hw/virtio/virtio-access.h"
26 #include "hw/fw-path-provider.h"
27
28 int vhost_scsi_common_start(VHostSCSICommon *vsc)
29 {
30 int ret, i;
31 VirtIODevice *vdev = VIRTIO_DEVICE(vsc);
32 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
33 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
34
35 VirtIOSCSICommon *vs = (VirtIOSCSICommon *)vsc;
36
37 if (!k->set_guest_notifiers) {
38 error_report("binding does not support guest notifiers");
39 return -ENOSYS;
40 }
41
42 ret = vhost_dev_enable_notifiers(&vsc->dev, vdev);
43 if (ret < 0) {
44 return ret;
45 }
46
47 ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, true);
48 if (ret < 0) {
49 error_report("Error binding guest notifier");
50 goto err_host_notifiers;
51 }
52
53 vsc->dev.acked_features = vdev->guest_features;
54
55 assert(vsc->inflight == NULL);
56 vsc->inflight = g_new0(struct vhost_inflight, 1);
57 ret = vhost_dev_get_inflight(&vsc->dev,
58 vs->conf.virtqueue_size,
59 vsc->inflight);
60 if (ret < 0) {
61 error_report("Error get inflight: %d", -ret);
62 goto err_guest_notifiers;
63 }
64
65 ret = vhost_dev_set_inflight(&vsc->dev, vsc->inflight);
66 if (ret < 0) {
67 error_report("Error set inflight: %d", -ret);
68 goto err_guest_notifiers;
69 }
70
71 ret = vhost_dev_start(&vsc->dev, vdev);
72 if (ret < 0) {
73 error_report("Error start vhost dev");
74 goto err_guest_notifiers;
75 }
76
77 /* guest_notifier_mask/pending not used yet, so just unmask
78 * everything here. virtio-pci will do the right thing by
79 * enabling/disabling irqfd.
80 */
81 for (i = 0; i < vsc->dev.nvqs; i++) {
82 vhost_virtqueue_mask(&vsc->dev, vdev, vsc->dev.vq_index + i, false);
83 }
84
85 return ret;
86
87 err_guest_notifiers:
88 g_free(vsc->inflight);
89 vsc->inflight = NULL;
90
91 k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
92 err_host_notifiers:
93 vhost_dev_disable_notifiers(&vsc->dev, vdev);
94 return ret;
95 }
96
97 void vhost_scsi_common_stop(VHostSCSICommon *vsc)
98 {
99 VirtIODevice *vdev = VIRTIO_DEVICE(vsc);
100 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
101 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
102 int ret = 0;
103
104 vhost_dev_stop(&vsc->dev, vdev);
105
106 if (k->set_guest_notifiers) {
107 ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
108 if (ret < 0) {
109 error_report("vhost guest notifier cleanup failed: %d", ret);
110 }
111 }
112 assert(ret >= 0);
113
114 if (vsc->inflight) {
115 vhost_dev_free_inflight(vsc->inflight);
116 vsc->inflight = NULL;
117 }
118
119 vhost_dev_disable_notifiers(&vsc->dev, vdev);
120 }
121
122 uint64_t vhost_scsi_common_get_features(VirtIODevice *vdev, uint64_t features,
123 Error **errp)
124 {
125 VHostSCSICommon *vsc = VHOST_SCSI_COMMON(vdev);
126
127 /* Turn on predefined features supported by this device */
128 features |= vsc->host_features;
129
130 return vhost_get_features(&vsc->dev, vsc->feature_bits, features);
131 }
132
133 void vhost_scsi_common_set_config(VirtIODevice *vdev, const uint8_t *config)
134 {
135 VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
136 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
137
138 if ((uint32_t)virtio_ldl_p(vdev, &scsiconf->sense_size) != vs->sense_size ||
139 (uint32_t)virtio_ldl_p(vdev, &scsiconf->cdb_size) != vs->cdb_size) {
140 error_report("vhost-scsi does not support changing the sense data and "
141 "CDB sizes");
142 exit(1);
143 }
144 }
145
146 /*
147 * Implementation of an interface to adjust firmware path
148 * for the bootindex property handling.
149 */
150 char *vhost_scsi_common_get_fw_dev_path(FWPathProvider *p, BusState *bus,
151 DeviceState *dev)
152 {
153 VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev);
154 /* format: /channel@channel/vhost-scsi@target,lun */
155 return g_strdup_printf("/channel@%x/%s@%x,%x", vsc->channel,
156 qdev_fw_name(dev), vsc->target, vsc->lun);
157 }
158
159 static const TypeInfo vhost_scsi_common_info = {
160 .name = TYPE_VHOST_SCSI_COMMON,
161 .parent = TYPE_VIRTIO_SCSI_COMMON,
162 .instance_size = sizeof(VHostSCSICommon),
163 .abstract = true,
164 };
165
166 static void virtio_register_types(void)
167 {
168 type_register_static(&vhost_scsi_common_info);
169 }
170
171 type_init(virtio_register_types)