hw/scsi/vhost-scsi-common.c

   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)