hw/virtio/vhost-user-blk-pci.c

   1 /*
   2  * Vhost user blk PCI Bindings
   3  *
   4  * Copyright(C) 2017 Intel Corporation.
   5  *
   6  * Authors:
   7  *  Changpeng Liu <changpeng.liu@intel.com>
   8  *
   9  * Largely based on the "vhost-user-scsi.c" and "vhost-scsi.c" implemented by:
  10  * Felipe Franciosi <felipe@nutanix.com>
  11  * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
  12  * Nicholas Bellinger <nab@risingtidesystems.com>
  13  *
  14  * This work is licensed under the terms of the GNU LGPL, version 2 or later.
  15  * See the COPYING.LIB file in the top-level directory.
  16  *
  17  */
  18
  19 #include "qemu/osdep.h"
  20
  21 #include "standard-headers/linux/virtio_pci.h"
  22 #include "hw/virtio/virtio.h"
  23 #include "hw/virtio/vhost-user-blk.h"
  24 #include "hw/pci/pci.h"
  25 #include "hw/qdev-properties.h"
  26 #include "qapi/error.h"
  27 #include "qemu/error-report.h"
  28 #include "qemu/module.h"
  29 #include "virtio-pci.h"
  30
  31 typedef struct VHostUserBlkPCI VHostUserBlkPCI;
  32
  33 /*
  34  * vhost-user-blk-pci: This extends VirtioPCIProxy.
  35  */
  36 #define TYPE_VHOST_USER_BLK_PCI "vhost-user-blk-pci-base"
  37 #define VHOST_USER_BLK_PCI(obj) \
  38         OBJECT_CHECK(VHostUserBlkPCI, (obj), TYPE_VHOST_USER_BLK_PCI)
  39
  40 struct VHostUserBlkPCI {
  41     VirtIOPCIProxy parent_obj;
  42     VHostUserBlk vdev;
  43 };
  44
  45 static Property vhost_user_blk_pci_properties[] = {
  46     DEFINE_PROP_UINT32("class", VirtIOPCIProxy, class_code, 0),
  47     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
  48                        DEV_NVECTORS_UNSPECIFIED),
  49     DEFINE_PROP_END_OF_LIST(),
  50 };
  51
  52 static void vhost_user_blk_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
  53 {
  54     VHostUserBlkPCI *dev = VHOST_USER_BLK_PCI(vpci_dev);
  55     DeviceState *vdev = DEVICE(&dev->vdev);
  56
  57     if (dev->vdev.num_queues == VHOST_USER_BLK_AUTO_NUM_QUEUES) {
  58         dev->vdev.num_queues = virtio_pci_optimal_num_queues(0);
  59     }
  60
  61     if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
  62         vpci_dev->nvectors = dev->vdev.num_queues + 1;
  63     }
  64
  65     qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
  66 }
  67
  68 static void vhost_user_blk_pci_class_init(ObjectClass *klass, void *data)
  69 {
  70     DeviceClass *dc = DEVICE_CLASS(klass);
  71     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
  72     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
  73
  74     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
  75     device_class_set_props(dc, vhost_user_blk_pci_properties);
  76     k->realize = vhost_user_blk_pci_realize;
  77     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
  78     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_BLOCK;
  79     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
  80     pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
  81 }
  82
  83 static void vhost_user_blk_pci_instance_init(Object *obj)
  84 {
  85     VHostUserBlkPCI *dev = VHOST_USER_BLK_PCI(obj);
  86
  87     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
  88                                 TYPE_VHOST_USER_BLK);
  89     object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
  90                               "bootindex");
  91 }
  92
  93 static const VirtioPCIDeviceTypeInfo vhost_user_blk_pci_info = {
  94     .base_name               = TYPE_VHOST_USER_BLK_PCI,
  95     .generic_name            = "vhost-user-blk-pci",
  96     .transitional_name       = "vhost-user-blk-pci-transitional",
  97     .non_transitional_name   = "vhost-user-blk-pci-non-transitional",
  98     .instance_size  = sizeof(VHostUserBlkPCI),
  99     .instance_init  = vhost_user_blk_pci_instance_init,
 100     .class_init     = vhost_user_blk_pci_class_init,
 101 };
 102
 103 static void vhost_user_blk_pci_register(void)
 104 {
 105     virtio_pci_types_register(&vhost_user_blk_pci_info);
 106 }
 107
 108 type_init(vhost_user_blk_pci_register)