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 #include "qom/object.h"
  31
  32 typedef struct VHostUserBlkPCI VHostUserBlkPCI;
  33
  34 /*
  35  * vhost-user-blk-pci: This extends VirtioPCIProxy.
  36  */
  37 #define TYPE_VHOST_USER_BLK_PCI "vhost-user-blk-pci-base"
  38 DECLARE_INSTANCE_CHECKER(VHostUserBlkPCI, VHOST_USER_BLK_PCI,
  39                          TYPE_VHOST_USER_BLK_PCI)
  40
  41 struct VHostUserBlkPCI {
  42     VirtIOPCIProxy parent_obj;
  43     VHostUserBlk vdev;
  44 };
  45
  46 static Property vhost_user_blk_pci_properties[] = {
  47     DEFINE_PROP_UINT32("class", VirtIOPCIProxy, class_code, 0),
  48     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
  49                        DEV_NVECTORS_UNSPECIFIED),
  50     DEFINE_PROP_END_OF_LIST(),
  51 };
  52
  53 static void vhost_user_blk_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
  54 {
  55     VHostUserBlkPCI *dev = VHOST_USER_BLK_PCI(vpci_dev);
  56     DeviceState *vdev = DEVICE(&dev->vdev);
  57
  58     if (dev->vdev.num_queues == VHOST_USER_BLK_AUTO_NUM_QUEUES) {
  59         dev->vdev.num_queues = virtio_pci_optimal_num_queues(0);
  60     }
  61
  62     if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
  63         vpci_dev->nvectors = dev->vdev.num_queues + 1;
  64     }
  65
  66     qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
  67 }
  68
  69 static void vhost_user_blk_pci_class_init(ObjectClass *klass, void *data)
  70 {
  71     DeviceClass *dc = DEVICE_CLASS(klass);
  72     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
  73     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
  74
  75     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
  76     device_class_set_props(dc, vhost_user_blk_pci_properties);
  77     k->realize = vhost_user_blk_pci_realize;
  78     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
  79     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_BLOCK;
  80     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
  81     pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
  82 }
  83
  84 static void vhost_user_blk_pci_instance_init(Object *obj)
  85 {
  86     VHostUserBlkPCI *dev = VHOST_USER_BLK_PCI(obj);
  87
  88     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
  89                                 TYPE_VHOST_USER_BLK);
  90     object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
  91                               "bootindex");
  92 }
  93
  94 static const VirtioPCIDeviceTypeInfo vhost_user_blk_pci_info = {
  95     .base_name               = TYPE_VHOST_USER_BLK_PCI,
  96     .generic_name            = "vhost-user-blk-pci",
  97     .transitional_name       = "vhost-user-blk-pci-transitional",
  98     .non_transitional_name   = "vhost-user-blk-pci-non-transitional",
  99     .instance_size  = sizeof(VHostUserBlkPCI),
 100     .instance_init  = vhost_user_blk_pci_instance_init,
 101     .class_init     = vhost_user_blk_pci_class_init,
 102 };
 103
 104 static void vhost_user_blk_pci_register(void)
 105 {
 106     virtio_pci_types_register(&vhost_user_blk_pci_info);
 107 }
 108
 109 type_init(vhost_user_blk_pci_register)