LXR qemu/hw/virtio/virtio-mem-pci.c

   1/*
   2 * Virtio MEM PCI device
   3 *
   4 * Copyright (C) 2020 Red Hat, Inc.
   5 *
   6 * Authors:
   7 *  David Hildenbrand <david@redhat.com>
   8 *
   9 * This work is licensed under the terms of the GNU GPL, version 2.
  10 * See the COPYING file in the top-level directory.
  11 */
  12
  13#include "qemu/osdep.h"
  14#include "virtio-mem-pci.h"
  15#include "hw/mem/memory-device.h"
  16#include "qapi/error.h"
  17#include "qapi/qapi-events-machine.h"
  18#include "qapi/qapi-events-misc.h"
  19
  20static void virtio_mem_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
  21{
  22    VirtIOMEMPCI *mem_pci = VIRTIO_MEM_PCI(vpci_dev);
  23    DeviceState *vdev = DEVICE(&mem_pci->vdev);
  24
  25    virtio_pci_force_virtio_1(vpci_dev);
  26    qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
  27}
  28
  29static void virtio_mem_pci_set_addr(MemoryDeviceState *md, uint64_t addr,
  30                                    Error **errp)
  31{
  32    object_property_set_uint(OBJECT(md), VIRTIO_MEM_ADDR_PROP, addr, errp);
  33}
  34
  35static uint64_t virtio_mem_pci_get_addr(const MemoryDeviceState *md)
  36{
  37    return object_property_get_uint(OBJECT(md), VIRTIO_MEM_ADDR_PROP,
  38                                    &error_abort);
  39}
  40
  41static MemoryRegion *virtio_mem_pci_get_memory_region(MemoryDeviceState *md,
  42                                                      Error **errp)
  43{
  44    VirtIOMEMPCI *pci_mem = VIRTIO_MEM_PCI(md);
  45    VirtIOMEM *vmem = VIRTIO_MEM(&pci_mem->vdev);
  46    VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem);
  47
  48    return vmc->get_memory_region(vmem, errp);
  49}
  50
  51static uint64_t virtio_mem_pci_get_plugged_size(const MemoryDeviceState *md,
  52                                                Error **errp)
  53{
  54    return object_property_get_uint(OBJECT(md), VIRTIO_MEM_SIZE_PROP,
  55                                    errp);
  56}
  57
  58static void virtio_mem_pci_fill_device_info(const MemoryDeviceState *md,
  59                                            MemoryDeviceInfo *info)
  60{
  61    VirtioMEMDeviceInfo *vi = g_new0(VirtioMEMDeviceInfo, 1);
  62    VirtIOMEMPCI *pci_mem = VIRTIO_MEM_PCI(md);
  63    VirtIOMEM *vmem = VIRTIO_MEM(&pci_mem->vdev);
  64    VirtIOMEMClass *vpc = VIRTIO_MEM_GET_CLASS(vmem);
  65    DeviceState *dev = DEVICE(md);
  66
  67    if (dev->id) {
  68        vi->id = g_strdup(dev->id);
  69    }
  70
  71    /* let the real device handle everything else */
  72    vpc->fill_device_info(vmem, vi);
  73
  74    info->u.virtio_mem.data = vi;
  75    info->type = MEMORY_DEVICE_INFO_KIND_VIRTIO_MEM;
  76}
  77
  78static uint64_t virtio_mem_pci_get_min_alignment(const MemoryDeviceState *md)
  79{
  80    return object_property_get_uint(OBJECT(md), VIRTIO_MEM_BLOCK_SIZE_PROP,
  81                                    &error_abort);
  82}
  83
  84static void virtio_mem_pci_size_change_notify(Notifier *notifier, void *data)
  85{
  86    VirtIOMEMPCI *pci_mem = container_of(notifier, VirtIOMEMPCI,
  87                                         size_change_notifier);
  88    DeviceState *dev = DEVICE(pci_mem);
  89    char *qom_path = object_get_canonical_path(OBJECT(dev));
  90    const uint64_t * const size_p = data;
  91
  92    qapi_event_send_memory_device_size_change(dev->id, *size_p, qom_path);
  93    g_free(qom_path);
  94}
  95
  96static void virtio_mem_pci_class_init(ObjectClass *klass, void *data)
  97{
  98    DeviceClass *dc = DEVICE_CLASS(klass);
  99    VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
 100    PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
 101    MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(klass);
 102
 103    k->realize = virtio_mem_pci_realize;
 104    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 105    pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
 106    pcidev_k->class_id = PCI_CLASS_OTHERS;
 107
 108    mdc->get_addr = virtio_mem_pci_get_addr;
 109    mdc->set_addr = virtio_mem_pci_set_addr;
 110    mdc->get_plugged_size = virtio_mem_pci_get_plugged_size;
 111    mdc->get_memory_region = virtio_mem_pci_get_memory_region;
 112    mdc->fill_device_info = virtio_mem_pci_fill_device_info;
 113    mdc->get_min_alignment = virtio_mem_pci_get_min_alignment;
 114}
 115
 116static void virtio_mem_pci_instance_init(Object *obj)
 117{
 118    VirtIOMEMPCI *dev = VIRTIO_MEM_PCI(obj);
 119    VirtIOMEMClass *vmc;
 120    VirtIOMEM *vmem;
 121
 122    virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 123                                TYPE_VIRTIO_MEM);
 124
 125    dev->size_change_notifier.notify = virtio_mem_pci_size_change_notify;
 126    vmem = VIRTIO_MEM(&dev->vdev);
 127    vmc = VIRTIO_MEM_GET_CLASS(vmem);
 128    /*
 129     * We never remove the notifier again, as we expect both devices to
 130     * disappear at the same time.
 131     */
 132    vmc->add_size_change_notifier(vmem, &dev->size_change_notifier);
 133
 134    object_property_add_alias(obj, VIRTIO_MEM_BLOCK_SIZE_PROP,
 135                              OBJECT(&dev->vdev), VIRTIO_MEM_BLOCK_SIZE_PROP);
 136    object_property_add_alias(obj, VIRTIO_MEM_SIZE_PROP, OBJECT(&dev->vdev),
 137                              VIRTIO_MEM_SIZE_PROP);
 138    object_property_add_alias(obj, VIRTIO_MEM_REQUESTED_SIZE_PROP,
 139                              OBJECT(&dev->vdev),
 140                              VIRTIO_MEM_REQUESTED_SIZE_PROP);
 141}
 142
 143static const VirtioPCIDeviceTypeInfo virtio_mem_pci_info = {
 144    .base_name = TYPE_VIRTIO_MEM_PCI,
 145    .generic_name = "virtio-mem-pci",
 146    .instance_size = sizeof(VirtIOMEMPCI),
 147    .instance_init = virtio_mem_pci_instance_init,
 148    .class_init = virtio_mem_pci_class_init,
 149    .interfaces = (InterfaceInfo[]) {
 150        { TYPE_MEMORY_DEVICE },
 151        { }
 152    },
 153};
 154
 155static void virtio_mem_pci_register_types(void)
 156{
 157    virtio_pci_types_register(&virtio_mem_pci_info);
 158}
 159type_init(virtio_mem_pci_register_types)
 160