summaryrefslogtreecommitdiffstats
path: root/hw/scsi/vhost-scsi-common.c
blob: 767f827e55beb923e96b903900aaa1c9e4e9c266 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
/*
 * vhost-scsi-common
 *
 * Copyright (c) 2016 Nutanix Inc. All rights reserved.
 *
 * Author:
 *  Felipe Franciosi <felipe@nutanix.com>
 *
 * This work is largely based on the "vhost-scsi" implementation by:
 *  Stefan Hajnoczi    <stefanha@linux.vnet.ibm.com>
 *  Nicholas Bellinger <nab@risingtidesystems.com>
 *
 * This work is licensed under the terms of the GNU LGPL, version 2 or later.
 * See the COPYING.LIB file in the top-level directory.
 *
 */

#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
#include "hw/virtio/vhost.h"
#include "hw/virtio/vhost-scsi-common.h"
#include "hw/virtio/virtio-scsi.h"
#include "hw/virtio/virtio-bus.h"
#include "hw/virtio/virtio-access.h"
#include "hw/fw-path-provider.h"

int vhost_scsi_common_start(VHostSCSICommon *vsc)
{
    int ret, i;
    VirtIODevice *vdev = VIRTIO_DEVICE(vsc);
    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);

    VirtIOSCSICommon *vs = (VirtIOSCSICommon *)vsc;

    if (!k->set_guest_notifiers) {
        error_report("binding does not support guest notifiers");
        return -ENOSYS;
    }

    ret = vhost_dev_enable_notifiers(&vsc->dev, vdev);
    if (ret < 0) {
        return ret;
    }

    ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, true);
    if (ret < 0) {
        error_report("Error binding guest notifier");
        goto err_host_notifiers;
    }

    vsc->dev.acked_features = vdev->guest_features;

    assert(vsc->inflight == NULL);
    vsc->inflight = g_new0(struct vhost_inflight, 1);
    ret = vhost_dev_get_inflight(&vsc->dev,
                                 vs->conf.virtqueue_size,
                                 vsc->inflight);
    if (ret < 0) {
        error_report("Error get inflight: %d", -ret);
        goto err_guest_notifiers;
    }

    ret = vhost_dev_set_inflight(&vsc->dev, vsc->inflight);
    if (ret < 0) {
        error_report("Error set inflight: %d", -ret);
        goto err_guest_notifiers;
    }

    ret = vhost_dev_start(&vsc->dev, vdev);
    if (ret < 0) {
        error_report("Error start vhost dev");
        goto err_guest_notifiers;
    }

    /* guest_notifier_mask/pending not used yet, so just unmask
     * everything here.  virtio-pci will do the right thing by
     * enabling/disabling irqfd.
     */
    for (i = 0; i < vsc->dev.nvqs; i++) {
        vhost_virtqueue_mask(&vsc->dev, vdev, vsc->dev.vq_index + i, false);
    }

    return ret;

err_guest_notifiers:
    g_free(vsc->inflight);
    vsc->inflight = NULL;

    k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
err_host_notifiers:
    vhost_dev_disable_notifiers(&vsc->dev, vdev);
    return ret;
}

void vhost_scsi_common_stop(VHostSCSICommon *vsc)
{
    VirtIODevice *vdev = VIRTIO_DEVICE(vsc);
    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
    int ret = 0;

    vhost_dev_stop(&vsc->dev, vdev);

    if (k->set_guest_notifiers) {
        ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
        if (ret < 0) {
                error_report("vhost guest notifier cleanup failed: %d", ret);
        }
    }
    assert(ret >= 0);

    if (vsc->inflight) {
        vhost_dev_free_inflight(vsc->inflight);
        vsc->inflight = NULL;
    }

    vhost_dev_disable_notifiers(&vsc->dev, vdev);
}

uint64_t vhost_scsi_common_get_features(VirtIODevice *vdev, uint64_t features,
                                        Error **errp)
{
    VHostSCSICommon *vsc = VHOST_SCSI_COMMON(vdev);

    /* Turn on predefined features supported by this device */
    features |= vsc->host_features;

    return vhost_get_features(&vsc->dev, vsc->feature_bits, features);
}

void vhost_scsi_common_set_config(VirtIODevice *vdev, const uint8_t *config)
{
    VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
    VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);

    if ((uint32_t)virtio_ldl_p(vdev, &scsiconf->sense_size) != vs->sense_size ||
        (uint32_t)virtio_ldl_p(vdev, &scsiconf->cdb_size) != vs->cdb_size) {
        error_report("vhost-scsi does not support changing the sense data and "
                     "CDB sizes");
        exit(1);
    }
}

/*
 * Implementation of an interface to adjust firmware path
 * for the bootindex property handling.
 */
char *vhost_scsi_common_get_fw_dev_path(FWPathProvider *p, BusState *bus,
                                        DeviceState *dev)
{
    VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev);
    /* format: /channel@channel/vhost-scsi@target,lun */
    return g_strdup_printf("/channel@%x/%s@%x,%x", vsc->channel,
                           qdev_fw_name(dev), vsc->target, vsc->lun);
}

static const TypeInfo vhost_scsi_common_info = {
    .name = TYPE_VHOST_SCSI_COMMON,
    .parent = TYPE_VIRTIO_SCSI_COMMON,
    .instance_size = sizeof(VHostSCSICommon),
    .abstract = true,
};

static void virtio_register_types(void)
{
    type_register_static(&vhost_scsi_common_info);
}

type_init(virtio_register_types)