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
  20 static 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
  29 static 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
  35 static 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
  41 static 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
  51 static 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
  58 static 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
  79 static 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
  85 static 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
  98 static 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->revision = VIRTIO_PCI_ABI_VERSION;
 108     pcidev_k->class_id = PCI_CLASS_OTHERS;
 109
 110     mdc->get_addr = virtio_mem_pci_get_addr;
 111     mdc->set_addr = virtio_mem_pci_set_addr;
 112     mdc->get_plugged_size = virtio_mem_pci_get_plugged_size;
 113     mdc->get_memory_region = virtio_mem_pci_get_memory_region;
 114     mdc->fill_device_info = virtio_mem_pci_fill_device_info;
 115     mdc->get_min_alignment = virtio_mem_pci_get_min_alignment;
 116 }
 117
 118 static void virtio_mem_pci_instance_init(Object *obj)
 119 {
 120     VirtIOMEMPCI *dev = VIRTIO_MEM_PCI(obj);
 121     VirtIOMEMClass *vmc;
 122     VirtIOMEM *vmem;
 123
 124     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 125                                 TYPE_VIRTIO_MEM);
 126
 127     dev->size_change_notifier.notify = virtio_mem_pci_size_change_notify;
 128     vmem = VIRTIO_MEM(&dev->vdev);
 129     vmc = VIRTIO_MEM_GET_CLASS(vmem);
 130     /*
 131      * We never remove the notifier again, as we expect both devices to
 132      * disappear at the same time.
 133      */
 134     vmc->add_size_change_notifier(vmem, &dev->size_change_notifier);
 135
 136     object_property_add_alias(obj, VIRTIO_MEM_BLOCK_SIZE_PROP,
 137                               OBJECT(&dev->vdev), VIRTIO_MEM_BLOCK_SIZE_PROP);
 138     object_property_add_alias(obj, VIRTIO_MEM_SIZE_PROP, OBJECT(&dev->vdev),
 139                               VIRTIO_MEM_SIZE_PROP);
 140     object_property_add_alias(obj, VIRTIO_MEM_REQUESTED_SIZE_PROP,
 141                               OBJECT(&dev->vdev),
 142                               VIRTIO_MEM_REQUESTED_SIZE_PROP);
 143 }
 144
 145 static const VirtioPCIDeviceTypeInfo virtio_mem_pci_info = {
 146     .base_name = TYPE_VIRTIO_MEM_PCI,
 147     .generic_name = "virtio-mem-pci",
 148     .instance_size = sizeof(VirtIOMEMPCI),
 149     .instance_init = virtio_mem_pci_instance_init,
 150     .class_init = virtio_mem_pci_class_init,
 151     .interfaces = (InterfaceInfo[]) {
 152         { TYPE_MEMORY_DEVICE },
 153         { }
 154     },
 155 };
 156
 157 static void virtio_mem_pci_register_types(void)
 158 {
 159     virtio_pci_types_register(&virtio_mem_pci_info);
 160 }
 161 type_init(virtio_mem_pci_register_types)