qemu/hw/virtio/virtio-mem-pci.c
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   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->has_id = true;
  69        vi->id = g_strdup(dev->id);
  70    }
  71
  72    /* let the real device handle everything else */
  73    vpc->fill_device_info(vmem, vi);
  74
  75    info->u.virtio_mem.data = vi;
  76    info->type = MEMORY_DEVICE_INFO_KIND_VIRTIO_MEM;
  77}
  78
  79static uint64_t virtio_mem_pci_get_min_alignment(const MemoryDeviceState *md)
  80{
  81    return object_property_get_uint(OBJECT(md), VIRTIO_MEM_BLOCK_SIZE_PROP,
  82                                    &error_abort);
  83}
  84
  85static void virtio_mem_pci_size_change_notify(Notifier *notifier, void *data)
  86{
  87    VirtIOMEMPCI *pci_mem = container_of(notifier, VirtIOMEMPCI,
  88                                         size_change_notifier);
  89    DeviceState *dev = DEVICE(pci_mem);
  90    char *qom_path = object_get_canonical_path(OBJECT(dev));
  91    const uint64_t * const size_p = data;
  92
  93    qapi_event_send_memory_device_size_change(!!dev->id, dev->id, *size_p,
  94                                              qom_path);
  95    g_free(qom_path);
  96}
  97
  98static void virtio_mem_pci_class_init(ObjectClass *klass, void *data)
  99{
 100    DeviceClass *dc = DEVICE_CLASS(klass);
 101    VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
 102    PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
 103    MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(klass);
 104
 105    k->realize = virtio_mem_pci_realize;
 106    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 107    pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
 108    pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_MEM;
 109    pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
 110    pcidev_k->class_id = PCI_CLASS_OTHERS;
 111
 112    mdc->get_addr = virtio_mem_pci_get_addr;
 113    mdc->set_addr = virtio_mem_pci_set_addr;
 114    mdc->get_plugged_size = virtio_mem_pci_get_plugged_size;
 115    mdc->get_memory_region = virtio_mem_pci_get_memory_region;
 116    mdc->fill_device_info = virtio_mem_pci_fill_device_info;
 117    mdc->get_min_alignment = virtio_mem_pci_get_min_alignment;
 118}
 119
 120static void virtio_mem_pci_instance_init(Object *obj)
 121{
 122    VirtIOMEMPCI *dev = VIRTIO_MEM_PCI(obj);
 123    VirtIOMEMClass *vmc;
 124    VirtIOMEM *vmem;
 125
 126    virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 127                                TYPE_VIRTIO_MEM);
 128
 129    dev->size_change_notifier.notify = virtio_mem_pci_size_change_notify;
 130    vmem = VIRTIO_MEM(&dev->vdev);
 131    vmc = VIRTIO_MEM_GET_CLASS(vmem);
 132    /*
 133     * We never remove the notifier again, as we expect both devices to
 134     * disappear at the same time.
 135     */
 136    vmc->add_size_change_notifier(vmem, &dev->size_change_notifier);
 137
 138    object_property_add_alias(obj, VIRTIO_MEM_BLOCK_SIZE_PROP,
 139                              OBJECT(&dev->vdev), VIRTIO_MEM_BLOCK_SIZE_PROP);
 140    object_property_add_alias(obj, VIRTIO_MEM_SIZE_PROP, OBJECT(&dev->vdev),
 141                              VIRTIO_MEM_SIZE_PROP);
 142    object_property_add_alias(obj, VIRTIO_MEM_REQUESTED_SIZE_PROP,
 143                              OBJECT(&dev->vdev),
 144                              VIRTIO_MEM_REQUESTED_SIZE_PROP);
 145}
 146
 147static const VirtioPCIDeviceTypeInfo virtio_mem_pci_info = {
 148    .base_name = TYPE_VIRTIO_MEM_PCI,
 149    .generic_name = "virtio-mem-pci",
 150    .instance_size = sizeof(VirtIOMEMPCI),
 151    .instance_init = virtio_mem_pci_instance_init,
 152    .class_init = virtio_mem_pci_class_init,
 153    .interfaces = (InterfaceInfo[]) {
 154        { TYPE_MEMORY_DEVICE },
 155        { }
 156    },
 157};
 158
 159static void virtio_mem_pci_register_types(void)
 160{
 161    virtio_pci_types_register(&virtio_mem_pci_info);
 162}
 163type_init(virtio_mem_pci_register_types)
 164