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 "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)