LXR qemu/hw/virtio/vhost-scsi-pci.c

   1/*
   2 * Vhost scsi PCI bindings
   3 *
   4 * Copyright IBM, Corp. 2011
   5 *
   6 * Authors:
   7 *  Stefan Hajnoczi   <stefanha@linux.vnet.ibm.com>
   8 *
   9 * Changes for QEMU mainline + tcm_vhost kernel upstream:
  10 *  Nicholas Bellinger <nab@risingtidesystems.com>
  11 *
  12 * This work is licensed under the terms of the GNU LGPL, version 2 or later.
  13 * See the COPYING.LIB file in the top-level directory.
  14 *
  15 */
  16
  17#include "qemu/osdep.h"
  18
  19#include "standard-headers/linux/virtio_pci.h"
  20#include "hw/qdev-properties.h"
  21#include "hw/virtio/vhost-scsi.h"
  22#include "qapi/error.h"
  23#include "qemu/module.h"
  24#include "virtio-pci.h"
  25#include "qom/object.h"
  26
  27typedef struct VHostSCSIPCI VHostSCSIPCI;
  28
  29/*
  30 * vhost-scsi-pci: This extends VirtioPCIProxy.
  31 */
  32#define TYPE_VHOST_SCSI_PCI "vhost-scsi-pci-base"
  33DECLARE_INSTANCE_CHECKER(VHostSCSIPCI, VHOST_SCSI_PCI,
  34                         TYPE_VHOST_SCSI_PCI)
  35
  36struct VHostSCSIPCI {
  37    VirtIOPCIProxy parent_obj;
  38    VHostSCSI vdev;
  39};
  40
  41static Property vhost_scsi_pci_properties[] = {
  42    DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
  43                       DEV_NVECTORS_UNSPECIFIED),
  44    DEFINE_PROP_END_OF_LIST(),
  45};
  46
  47static void vhost_scsi_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
  48{
  49    VHostSCSIPCI *dev = VHOST_SCSI_PCI(vpci_dev);
  50    DeviceState *vdev = DEVICE(&dev->vdev);
  51    VirtIOSCSIConf *conf = &dev->vdev.parent_obj.parent_obj.conf;
  52
  53    if (conf->num_queues == VIRTIO_SCSI_AUTO_NUM_QUEUES) {
  54        conf->num_queues =
  55            virtio_pci_optimal_num_queues(VIRTIO_SCSI_VQ_NUM_FIXED);
  56    }
  57
  58    if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
  59        vpci_dev->nvectors = conf->num_queues + VIRTIO_SCSI_VQ_NUM_FIXED + 1;
  60    }
  61
  62    qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
  63}
  64
  65static void vhost_scsi_pci_class_init(ObjectClass *klass, void *data)
  66{
  67    DeviceClass *dc = DEVICE_CLASS(klass);
  68    VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
  69    PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
  70    k->realize = vhost_scsi_pci_realize;
  71    set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
  72    device_class_set_props(dc, vhost_scsi_pci_properties);
  73    pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
  74    pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
  75    pcidev_k->revision = 0x00;
  76    pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
  77}
  78
  79static void vhost_scsi_pci_instance_init(Object *obj)
  80{
  81    VHostSCSIPCI *dev = VHOST_SCSI_PCI(obj);
  82
  83    virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
  84                                TYPE_VHOST_SCSI);
  85    object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
  86                              "bootindex");
  87}
  88
  89static const VirtioPCIDeviceTypeInfo vhost_scsi_pci_info = {
  90    .base_name             = TYPE_VHOST_SCSI_PCI,
  91    .generic_name          = "vhost-scsi-pci",
  92    .transitional_name     = "vhost-scsi-pci-transitional",
  93    .non_transitional_name = "vhost-scsi-pci-non-transitional",
  94    .instance_size = sizeof(VHostSCSIPCI),
  95    .instance_init = vhost_scsi_pci_instance_init,
  96    .class_init    = vhost_scsi_pci_class_init,
  97};
  98
  99static void vhost_scsi_pci_register(void)
 100{
 101    virtio_pci_types_register(&vhost_scsi_pci_info);
 102}
 103
 104type_init(vhost_scsi_pci_register)
 105