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
  27 typedef struct VHostSCSIPCI VHostSCSIPCI;
  28
  29 /*
  30  * vhost-scsi-pci: This extends VirtioPCIProxy.
  31  */
  32 #define TYPE_VHOST_SCSI_PCI "vhost-scsi-pci-base"
  33 DECLARE_INSTANCE_CHECKER(VHostSCSIPCI, VHOST_SCSI_PCI,
  34                          TYPE_VHOST_SCSI_PCI)
  35
  36 struct VHostSCSIPCI {
  37     VirtIOPCIProxy parent_obj;
  38     VHostSCSI vdev;
  39 };
  40
  41 static Property vhost_scsi_pci_properties[] = {
  42     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
  43                        DEV_NVECTORS_UNSPECIFIED),
  44     DEFINE_PROP_END_OF_LIST(),
  45 };
  46
  47 static 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
  65 static 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
  79 static 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
  89 static 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
  99 static void vhost_scsi_pci_register(void)
 100 {
 101     virtio_pci_types_register(&vhost_scsi_pci_info);
 102 }
 103
 104 type_init(vhost_scsi_pci_register)