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) 172