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 | if (!k->set_guest_notifiers) { |
36 | error_report("binding does not support guest notifiers" ); |
37 | return -ENOSYS; |
38 | } |
39 | |
40 | ret = vhost_dev_enable_notifiers(&vsc->dev, vdev); |
41 | if (ret < 0) { |
42 | return ret; |
43 | } |
44 | |
45 | ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, true); |
46 | if (ret < 0) { |
47 | error_report("Error binding guest notifier" ); |
48 | goto err_host_notifiers; |
49 | } |
50 | |
51 | vsc->dev.acked_features = vdev->guest_features; |
52 | ret = vhost_dev_start(&vsc->dev, vdev); |
53 | if (ret < 0) { |
54 | error_report("Error start vhost dev" ); |
55 | goto err_guest_notifiers; |
56 | } |
57 | |
58 | /* guest_notifier_mask/pending not used yet, so just unmask |
59 | * everything here. virtio-pci will do the right thing by |
60 | * enabling/disabling irqfd. |
61 | */ |
62 | for (i = 0; i < vsc->dev.nvqs; i++) { |
63 | vhost_virtqueue_mask(&vsc->dev, vdev, vsc->dev.vq_index + i, false); |
64 | } |
65 | |
66 | return ret; |
67 | |
68 | err_guest_notifiers: |
69 | k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false); |
70 | err_host_notifiers: |
71 | vhost_dev_disable_notifiers(&vsc->dev, vdev); |
72 | return ret; |
73 | } |
74 | |
75 | void vhost_scsi_common_stop(VHostSCSICommon *vsc) |
76 | { |
77 | VirtIODevice *vdev = VIRTIO_DEVICE(vsc); |
78 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
79 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); |
80 | int ret = 0; |
81 | |
82 | vhost_dev_stop(&vsc->dev, vdev); |
83 | |
84 | if (k->set_guest_notifiers) { |
85 | ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false); |
86 | if (ret < 0) { |
87 | error_report("vhost guest notifier cleanup failed: %d" , ret); |
88 | } |
89 | } |
90 | assert(ret >= 0); |
91 | |
92 | vhost_dev_disable_notifiers(&vsc->dev, vdev); |
93 | } |
94 | |
95 | uint64_t vhost_scsi_common_get_features(VirtIODevice *vdev, uint64_t features, |
96 | Error **errp) |
97 | { |
98 | VHostSCSICommon *vsc = VHOST_SCSI_COMMON(vdev); |
99 | |
100 | /* Turn on predefined features supported by this device */ |
101 | features |= vsc->host_features; |
102 | |
103 | return vhost_get_features(&vsc->dev, vsc->feature_bits, features); |
104 | } |
105 | |
106 | void vhost_scsi_common_set_config(VirtIODevice *vdev, const uint8_t *config) |
107 | { |
108 | VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; |
109 | VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev); |
110 | |
111 | if ((uint32_t)virtio_ldl_p(vdev, &scsiconf->sense_size) != vs->sense_size || |
112 | (uint32_t)virtio_ldl_p(vdev, &scsiconf->cdb_size) != vs->cdb_size) { |
113 | error_report("vhost-scsi does not support changing the sense data and " |
114 | "CDB sizes" ); |
115 | exit(1); |
116 | } |
117 | } |
118 | |
119 | /* |
120 | * Implementation of an interface to adjust firmware path |
121 | * for the bootindex property handling. |
122 | */ |
123 | char *vhost_scsi_common_get_fw_dev_path(FWPathProvider *p, BusState *bus, |
124 | DeviceState *dev) |
125 | { |
126 | VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev); |
127 | /* format: /channel@channel/vhost-scsi@target,lun */ |
128 | return g_strdup_printf("/channel@%x/%s@%x,%x" , vsc->channel, |
129 | qdev_fw_name(dev), vsc->target, vsc->lun); |
130 | } |
131 | |
132 | static const TypeInfo vhost_scsi_common_info = { |
133 | .name = TYPE_VHOST_SCSI_COMMON, |
134 | .parent = TYPE_VIRTIO_SCSI_COMMON, |
135 | .instance_size = sizeof(VHostSCSICommon), |
136 | .abstract = true, |
137 | }; |
138 | |
139 | static void virtio_register_types(void) |
140 | { |
141 | type_register_static(&vhost_scsi_common_info); |
142 | } |
143 | |
144 | type_init(virtio_register_types) |
145 | |