text: /*
   * vhost-scsi-common
   *
   * Copyright (c) 2016 Nutanix Inc. All rights reserved.
   *
   * Author:
   *  Felipe Franciosi <felipe@nutanix.com>
   *
   * This work is largely based on the "vhost-scsi" implementation by:
   *  Stefan Hajnoczi    <stefanha@linux.vnet.ibm.com>
   *  Nicholas Bellinger <nab@risingtidesystems.com>
   *
   * This work is licensed under the terms of the GNU LGPL, version 2 or later.
   * See the COPYING.LIB file in the top-level directory.
   *
   */
  
  #include "qemu/osdep.h"
  #include "qemu/error-report.h"
  #include "hw/virtio/vhost.h"
  #include "hw/virtio/vhost-scsi-common.h"
  #include "hw/virtio/virtio-scsi.h"
  #include "hw/virtio/virtio-bus.h"
  #include "hw/virtio/virtio-access.h"
  #include "hw/fw-path-provider.h"
  
  int vhost_scsi_common_start(VHostSCSICommon *vsc)
  {
      int ret, i;
      VirtIODevice *vdev = VIRTIO_DEVICE(vsc);
      BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
      VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
  
      if (!k->set_guest_notifiers) {
          error_report("binding does not support guest notifiers");
          return -ENOSYS;
      }
  
      ret = vhost_dev_enable_notifiers(&vsc->dev, vdev);
      if (ret < 0) {
          return ret;
      }
  
      ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, true);
      if (ret < 0) {
          error_report("Error binding guest notifier");
          goto err_host_notifiers;
      }
  
      vsc->dev.acked_features = vdev->guest_features;
      ret = vhost_dev_start(&vsc->dev, vdev);
      if (ret < 0) {
          error_report("Error start vhost dev");
          goto err_guest_notifiers;
      }
  
      /* guest_notifier_mask/pending not used yet, so just unmask
       * everything here.  virtio-pci will do the right thing by
       * enabling/disabling irqfd.
       */
      for (i = 0; i < vsc->dev.nvqs; i++) {
          vhost_virtqueue_mask(&vsc->dev, vdev, vsc->dev.vq_index + i, false);
      }
  
      return ret;
  
  err_guest_notifiers:
      k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
  err_host_notifiers:
      vhost_dev_disable_notifiers(&vsc->dev, vdev);
      return ret;
  }
  
  void vhost_scsi_common_stop(VHostSCSICommon *vsc)
  {
      VirtIODevice *vdev = VIRTIO_DEVICE(vsc);
      BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
      VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
      int ret = 0;
  
      vhost_dev_stop(&vsc->dev, vdev);
  
      if (k->set_guest_notifiers) {
          ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
          if (ret < 0) {
                  error_report("vhost guest notifier cleanup failed: %d", ret);
          }
      }
      assert(ret >= 0);
  
      vhost_dev_disable_notifiers(&vsc->dev, vdev);
  }
  
  uint64_t vhost_scsi_common_get_features(VirtIODevice *vdev, uint64_t features,
                                          Error **errp)
  {
      VHostSCSICommon *vsc = VHOST_SCSI_COMMON(vdev);
  
      /* Turn on predefined features supported by this device */
      features |= vsc->host_features;
  
      return vhost_get_features(&vsc->dev, vsc->feature_bits, features);
  }
  
  void vhost_scsi_common_set_config(VirtIODevice *vdev, const uint8_t *config)
  {
      VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
      VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
  
      if ((uint32_t)virtio_ldl_p(vdev, &scsiconf->sense_size) != vs->sense_size ||
          (uint32_t)virtio_ldl_p(vdev, &scsiconf->cdb_size) != vs->cdb_size) {
          error_report("vhost-scsi does not support changing the sense data and "
                       "CDB sizes");
          exit(1);
      }
  }
  
  /*
   * Implementation of an interface to adjust firmware path
   * for the bootindex property handling.
   */
  char *vhost_scsi_common_get_fw_dev_path(FWPathProvider *p, BusState *bus,
                                          DeviceState *dev)
  {
      VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev);
      /* format: /channel@channel/vhost-scsi@target,lun */
      return g_strdup_printf("/channel@%x/%s@%x,%x", vsc->channel,
                             qdev_fw_name(dev), vsc->target, vsc->lun);
  }
  
  static const TypeInfo vhost_scsi_common_info = {
      .name = TYPE_VHOST_SCSI_COMMON,
      .parent = TYPE_VIRTIO_SCSI_COMMON,
      .instance_size = sizeof(VHostSCSICommon),
      .abstract = true,
  };
  
  static void virtio_register_types(void)
  {
      type_register_static(&vhost_scsi_common_info);
  }
  
  type_init(virtio_register_types)
  