hw/virtio/virtio-iommu-pci.c

   1 /*
   2  * Virtio IOMMU PCI Bindings
   3  *
   4  * Copyright (c) 2019 Red Hat, Inc.
   5  * Written by Eric Auger
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 or
   9  *  (at your option) any later version.
  10  */
  11
  12 #include "qemu/osdep.h"
  13
  14 #include "hw/virtio/virtio-pci.h"
  15 #include "hw/virtio/virtio-iommu.h"
  16 #include "hw/qdev-properties.h"
  17 #include "hw/qdev-properties-system.h"
  18 #include "qapi/error.h"
  19 #include "hw/boards.h"
  20 #include "hw/pci/pci_bus.h"
  21 #include "qom/object.h"
  22
  23 typedef struct VirtIOIOMMUPCI VirtIOIOMMUPCI;
  24
  25 /*
  26  * virtio-iommu-pci: This extends VirtioPCIProxy.
  27  *
  28  */
  29 DECLARE_INSTANCE_CHECKER(VirtIOIOMMUPCI, VIRTIO_IOMMU_PCI,
  30                          TYPE_VIRTIO_IOMMU_PCI)
  31
  32 struct VirtIOIOMMUPCI {
  33     VirtIOPCIProxy parent_obj;
  34     VirtIOIOMMU vdev;
  35 };
  36
  37 static Property virtio_iommu_pci_properties[] = {
  38     DEFINE_PROP_UINT32("class", VirtIOPCIProxy, class_code, 0),
  39     DEFINE_PROP_ARRAY("reserved-regions", VirtIOIOMMUPCI,
  40                       vdev.nr_prop_resv_regions, vdev.prop_resv_regions,
  41                       qdev_prop_reserved_region, ReservedRegion),
  42     DEFINE_PROP_END_OF_LIST(),
  43 };
  44
  45 static void virtio_iommu_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
  46 {
  47     VirtIOIOMMUPCI *dev = VIRTIO_IOMMU_PCI(vpci_dev);
  48     PCIBus *pbus = pci_get_bus(&vpci_dev->pci_dev);
  49     DeviceState *vdev = DEVICE(&dev->vdev);
  50     VirtIOIOMMU *s = VIRTIO_IOMMU(vdev);
  51
  52     if (!qdev_get_machine_hotplug_handler(DEVICE(vpci_dev))) {
  53         error_setg(errp, "Check your machine implements a hotplug handler "
  54                          "for the virtio-iommu-pci device");
  55         return;
  56     }
  57     for (int i = 0; i < s->nr_prop_resv_regions; i++) {
  58         if (s->prop_resv_regions[i].type != VIRTIO_IOMMU_RESV_MEM_T_RESERVED &&
  59             s->prop_resv_regions[i].type != VIRTIO_IOMMU_RESV_MEM_T_MSI) {
  60             error_setg(errp, "reserved region %d has an invalid type", i);
  61             error_append_hint(errp, "Valid values are 0 and 1\n");
  62             return;
  63         }
  64     }
  65     if (!pci_bus_is_root(pbus)) {
  66         error_setg(errp, "virtio-iommu-pci must be plugged on the root bus");
  67         return;
  68     }
  69
  70     object_property_set_link(OBJECT(dev), "primary-bus",
  71                              OBJECT(pbus), &error_abort);
  72
  73     virtio_pci_force_virtio_1(vpci_dev);
  74     qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
  75 }
  76
  77 static void virtio_iommu_pci_class_init(ObjectClass *klass, void *data)
  78 {
  79     DeviceClass *dc = DEVICE_CLASS(klass);
  80     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
  81     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
  82     k->realize = virtio_iommu_pci_realize;
  83     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
  84     device_class_set_props(dc, virtio_iommu_pci_properties);
  85     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
  86     pcidev_k->class_id = PCI_CLASS_OTHERS;
  87     dc->hotpluggable = false;
  88 }
  89
  90 static void virtio_iommu_pci_instance_init(Object *obj)
  91 {
  92     VirtIOIOMMUPCI *dev = VIRTIO_IOMMU_PCI(obj);
  93
  94     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
  95                                 TYPE_VIRTIO_IOMMU);
  96 }
  97
  98 static void virtio_iommu_pci_instance_finalize(Object *obj)
  99 {
 100     VirtIOIOMMUPCI *dev = VIRTIO_IOMMU_PCI(obj);
 101
 102     g_free(dev->vdev.prop_resv_regions);
 103 }
 104
 105 static const VirtioPCIDeviceTypeInfo virtio_iommu_pci_info = {
 106     .generic_name  = TYPE_VIRTIO_IOMMU_PCI,
 107     .instance_size = sizeof(VirtIOIOMMUPCI),
 108     .instance_init = virtio_iommu_pci_instance_init,
 109     .instance_finalize = virtio_iommu_pci_instance_finalize,
 110     .class_init    = virtio_iommu_pci_class_init,
 111 };
 112
 113 static void virtio_iommu_pci_register(void)
 114 {
 115     virtio_pci_types_register(&virtio_iommu_pci_info);
 116 }
 117
 118 type_init(virtio_iommu_pci_register)
 119
 120