LXR qemu/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
  28int 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    if (!k->set_guest_notifiers) {
  36        error_report("binding does not support guest notifiers");
  37        return -ENOSYS;
  38    }
  39
  40    ret = vhost_dev_enable_notifiers(&vsc->dev, vdev);
  41    if (ret < 0) {
  42        return ret;
  43    }
  44
  45    ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, true);
  46    if (ret < 0) {
  47        error_report("Error binding guest notifier");
  48        goto err_host_notifiers;
  49    }
  50
  51    vsc->dev.acked_features = vdev->guest_features;
  52    ret = vhost_dev_start(&vsc->dev, vdev);
  53    if (ret < 0) {
  54        error_report("Error start vhost dev");
  55        goto err_guest_notifiers;
  56    }
  57
  58    /* guest_notifier_mask/pending not used yet, so just unmask
  59     * everything here.  virtio-pci will do the right thing by
  60     * enabling/disabling irqfd.
  61     */
  62    for (i = 0; i < vsc->dev.nvqs; i++) {
  63        vhost_virtqueue_mask(&vsc->dev, vdev, vsc->dev.vq_index + i, false);
  64    }
  65
  66    return ret;
  67
  68err_guest_notifiers:
  69    k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
  70err_host_notifiers:
  71    vhost_dev_disable_notifiers(&vsc->dev, vdev);
  72    return ret;
  73}
  74
  75void vhost_scsi_common_stop(VHostSCSICommon *vsc)
  76{
  77    VirtIODevice *vdev = VIRTIO_DEVICE(vsc);
  78    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
  79    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
  80    int ret = 0;
  81
  82    vhost_dev_stop(&vsc->dev, vdev);
  83
  84    if (k->set_guest_notifiers) {
  85        ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
  86        if (ret < 0) {
  87                error_report("vhost guest notifier cleanup failed: %d", ret);
  88        }
  89    }
  90    assert(ret >= 0);
  91
  92    vhost_dev_disable_notifiers(&vsc->dev, vdev);
  93}
  94
  95uint64_t vhost_scsi_common_get_features(VirtIODevice *vdev, uint64_t features,
  96                                        Error **errp)
  97{
  98    VHostSCSICommon *vsc = VHOST_SCSI_COMMON(vdev);
  99
 100    /* Turn on predefined features supported by this device */
 101    features |= vsc->host_features;
 102
 103    return vhost_get_features(&vsc->dev, vsc->feature_bits, features);
 104}
 105
 106void vhost_scsi_common_set_config(VirtIODevice *vdev, const uint8_t *config)
 107{
 108    VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
 109    VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
 110
 111    if ((uint32_t)virtio_ldl_p(vdev, &scsiconf->sense_size) != vs->sense_size ||
 112        (uint32_t)virtio_ldl_p(vdev, &scsiconf->cdb_size) != vs->cdb_size) {
 113        error_report("vhost-scsi does not support changing the sense data and "
 114                     "CDB sizes");
 115        exit(1);
 116    }
 117}
 118
 119/*
 120 * Implementation of an interface to adjust firmware path
 121 * for the bootindex property handling.
 122 */
 123char *vhost_scsi_common_get_fw_dev_path(FWPathProvider *p, BusState *bus,
 124                                        DeviceState *dev)
 125{
 126    VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev);
 127    /* format: /channel@channel/vhost-scsi@target,lun */
 128    return g_strdup_printf("/channel@%x/%s@%x,%x", vsc->channel,
 129                           qdev_fw_name(dev), vsc->target, vsc->lun);
 130}
 131
 132static const TypeInfo vhost_scsi_common_info = {
 133    .name = TYPE_VHOST_SCSI_COMMON,
 134    .parent = TYPE_VIRTIO_SCSI_COMMON,
 135    .instance_size = sizeof(VHostSCSICommon),
 136    .abstract = true,
 137};
 138
 139static void virtio_register_types(void)
 140{
 141    type_register_static(&vhost_scsi_common_info);
 142}
 143
 144type_init(virtio_register_types)
 145