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

   1 /*
   2  * Vhost user scsi PCI Bindings
   3  *
   4  * Copyright (c) 2016 Nutanix Inc. All rights reserved.
   5  *
   6  * Author:
   7  *  Felipe Franciosi <felipe@nutanix.com>
   8  *
   9  * This work is largely based on the "vhost-scsi" implementation by:
  10  *  Stefan Hajnoczi    <stefanha@linux.vnet.ibm.com>
  11  *  Nicholas Bellinger <nab@risingtidesystems.com>
  12  *
  13  * This work is licensed under the terms of the GNU LGPL, version 2 or later.
  14  * See the COPYING.LIB file in the top-level directory.
  15  *
  16  */
  17
  18 #include "qemu/osdep.h"
  19
  20 #include "standard-headers/linux/virtio_pci.h"
  21 #include "hw/virtio/vhost-user-scsi.h"
  22 #include "hw/virtio/virtio.h"
  23 #include "hw/virtio/virtio-scsi.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/pci/msi.h"
  30 #include "hw/pci/msix.h"
  31 #include "hw/loader.h"
  32 #include "sysemu/kvm.h"
  33 #include "hw/virtio/virtio-pci.h"
  34 #include "qom/object.h"
  35
  36 typedef struct VHostUserSCSIPCI VHostUserSCSIPCI;
  37
  38 #define TYPE_VHOST_USER_SCSI_PCI "vhost-user-scsi-pci-base"
  39 DECLARE_INSTANCE_CHECKER(VHostUserSCSIPCI, VHOST_USER_SCSI_PCI,
  40                          TYPE_VHOST_USER_SCSI_PCI)
  41
  42 struct VHostUserSCSIPCI {
  43     VirtIOPCIProxy parent_obj;
  44     VHostUserSCSI vdev;
  45 };
  46
  47 static Property vhost_user_scsi_pci_properties[] = {
  48     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
  49                        DEV_NVECTORS_UNSPECIFIED),
  50     DEFINE_PROP_END_OF_LIST(),
  51 };
  52
  53 static void vhost_user_scsi_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
  54 {
  55     VHostUserSCSIPCI *dev = VHOST_USER_SCSI_PCI(vpci_dev);
  56     DeviceState *vdev = DEVICE(&dev->vdev);
  57     VirtIOSCSIConf *conf = &dev->vdev.parent_obj.parent_obj.conf;
  58
  59     if (conf->num_queues == VIRTIO_SCSI_AUTO_NUM_QUEUES) {
  60         conf->num_queues =
  61             virtio_pci_optimal_num_queues(VIRTIO_SCSI_VQ_NUM_FIXED);
  62     }
  63
  64     if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
  65         vpci_dev->nvectors = conf->num_queues + VIRTIO_SCSI_VQ_NUM_FIXED + 1;
  66     }
  67
  68     qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
  69 }
  70
  71 static void vhost_user_scsi_pci_class_init(ObjectClass *klass, void *data)
  72 {
  73     DeviceClass *dc = DEVICE_CLASS(klass);
  74     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
  75     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
  76     k->realize = vhost_user_scsi_pci_realize;
  77     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
  78     device_class_set_props(dc, vhost_user_scsi_pci_properties);
  79     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
  80     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
  81     pcidev_k->revision = 0x00;
  82     pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
  83 }
  84
  85 static void vhost_user_scsi_pci_instance_init(Object *obj)
  86 {
  87     VHostUserSCSIPCI *dev = VHOST_USER_SCSI_PCI(obj);
  88
  89     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
  90                                 TYPE_VHOST_USER_SCSI);
  91     object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
  92                               "bootindex");
  93 }
  94
  95 static const VirtioPCIDeviceTypeInfo vhost_user_scsi_pci_info = {
  96     .base_name             = TYPE_VHOST_USER_SCSI_PCI,
  97     .generic_name          = "vhost-user-scsi-pci",
  98     .transitional_name     = "vhost-user-scsi-pci-transitional",
  99     .non_transitional_name = "vhost-user-scsi-pci-non-transitional",
 100     .instance_size = sizeof(VHostUserSCSIPCI),
 101     .instance_init = vhost_user_scsi_pci_instance_init,
 102     .class_init    = vhost_user_scsi_pci_class_init,
 103 };
 104
 105 static void vhost_user_scsi_pci_register(void)
 106 {
 107     virtio_pci_types_register(&vhost_user_scsi_pci_info);
 108 }
 109
 110 type_init(vhost_user_scsi_pci_register)