xref: /openbmc/qemu/hw/scsi/vhost-scsi-common.c (revision 7962e432)
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/fw-path-provider.h"
28 
vhost_scsi_common_start(VHostSCSICommon * vsc,Error ** errp)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 
vhost_scsi_common_stop(VHostSCSICommon * vsc)104 void 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     vhost_dev_stop(&vsc->dev, vdev, true);
112 
113     if (k->set_guest_notifiers) {
114         ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
115         if (ret < 0) {
116                 error_report("vhost guest notifier cleanup failed: %d", ret);
117         }
118     }
119     assert(ret >= 0);
120 
121     vhost_dev_disable_notifiers(&vsc->dev, vdev);
122 }
123 
vhost_scsi_common_get_features(VirtIODevice * vdev,uint64_t features,Error ** errp)124 uint64_t vhost_scsi_common_get_features(VirtIODevice *vdev, uint64_t features,
125                                         Error **errp)
126 {
127     VHostSCSICommon *vsc = VHOST_SCSI_COMMON(vdev);
128 
129     /* Turn on predefined features supported by this device */
130     features |= vsc->host_features;
131 
132     return vhost_get_features(&vsc->dev, vsc->feature_bits, features);
133 }
134 
vhost_scsi_common_set_config(VirtIODevice * vdev,const uint8_t * config)135 void vhost_scsi_common_set_config(VirtIODevice *vdev, const uint8_t *config)
136 {
137     VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
138     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
139 
140     if ((uint32_t)virtio_ldl_p(vdev, &scsiconf->sense_size) != vs->sense_size ||
141         (uint32_t)virtio_ldl_p(vdev, &scsiconf->cdb_size) != vs->cdb_size) {
142         error_report("vhost-scsi does not support changing the sense data and "
143                      "CDB sizes");
144         exit(1);
145     }
146 }
147 
148 /*
149  * Implementation of an interface to adjust firmware path
150  * for the bootindex property handling.
151  */
vhost_scsi_common_get_fw_dev_path(FWPathProvider * p,BusState * bus,DeviceState * dev)152 char *vhost_scsi_common_get_fw_dev_path(FWPathProvider *p, BusState *bus,
153                                         DeviceState *dev)
154 {
155     VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev);
156     /* format: /channel@channel/vhost-scsi@target,lun */
157     return g_strdup_printf("/channel@%x/%s@%x,%x", vsc->channel,
158                            qdev_fw_name(dev), vsc->target, vsc->lun);
159 }
160 
161 static const TypeInfo vhost_scsi_common_info = {
162     .name = TYPE_VHOST_SCSI_COMMON,
163     .parent = TYPE_VIRTIO_SCSI_COMMON,
164     .instance_size = sizeof(VHostSCSICommon),
165     .abstract = true,
166 };
167 
virtio_register_types(void)168 static void virtio_register_types(void)
169 {
170     type_register_static(&vhost_scsi_common_info);
171 }
172 
173 type_init(virtio_register_types)
174