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 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 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 } 123 124 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 } 134 135 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 */ 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 }; 167 168 static void virtio_register_types(void) 169 { 170 type_register_static(&vhost_scsi_common_info); 171 } 172 173 type_init(virtio_register_types) 174