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    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
  87err_guest_notifiers:
  88    g_free(vsc->inflight);
  89    vsc->inflight = NULL;
  90
  91    k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
  92err_host_notifiers:
  93    vhost_dev_disable_notifiers(&vsc->dev, vdev);
  94    return ret;
  95}
  96
  97void 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
 122uint64_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
 133void 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 */
 150char *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
 159static 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
 166static void virtio_register_types(void)
 167{
 168    type_register_static(&vhost_scsi_common_info);
 169}
 170
 171type_init(virtio_register_types)
 172