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vhost-user-blk-pci.c (3522B)

      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 "hw/virtio/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)