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