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-misc.h"
  18
  19 static void virtio_mem_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
  20 {
  21     VirtIOMEMPCI *mem_pci = VIRTIO_MEM_PCI(vpci_dev);
  22     DeviceState *vdev = DEVICE(&mem_pci->vdev);
  23
  24     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
  25     object_property_set_bool(OBJECT(vdev), true, "realized", errp);
  26 }
  27
  28 static void virtio_mem_pci_set_addr(MemoryDeviceState *md, uint64_t addr,
  29                                     Error **errp)
  30 {
  31     object_property_set_uint(OBJECT(md), addr, VIRTIO_MEM_ADDR_PROP, errp);
  32 }
  33
  34 static uint64_t virtio_mem_pci_get_addr(const MemoryDeviceState *md)
  35 {
  36     return object_property_get_uint(OBJECT(md), VIRTIO_MEM_ADDR_PROP,
  37                                     &error_abort);
  38 }
  39
  40 static MemoryRegion *virtio_mem_pci_get_memory_region(MemoryDeviceState *md,
  41                                                       Error **errp)
  42 {
  43     VirtIOMEMPCI *pci_mem = VIRTIO_MEM_PCI(md);
  44     VirtIOMEM *vmem = VIRTIO_MEM(&pci_mem->vdev);
  45     VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem);
  46
  47     return vmc->get_memory_region(vmem, errp);
  48 }
  49
  50 static uint64_t virtio_mem_pci_get_plugged_size(const MemoryDeviceState *md,
  51                                                 Error **errp)
  52 {
  53     return object_property_get_uint(OBJECT(md), VIRTIO_MEM_SIZE_PROP,
  54                                     errp);
  55 }
  56
  57 static void virtio_mem_pci_fill_device_info(const MemoryDeviceState *md,
  58                                             MemoryDeviceInfo *info)
  59 {
  60     VirtioMEMDeviceInfo *vi = g_new0(VirtioMEMDeviceInfo, 1);
  61     VirtIOMEMPCI *pci_mem = VIRTIO_MEM_PCI(md);
  62     VirtIOMEM *vmem = VIRTIO_MEM(&pci_mem->vdev);
  63     VirtIOMEMClass *vpc = VIRTIO_MEM_GET_CLASS(vmem);
  64     DeviceState *dev = DEVICE(md);
  65
  66     if (dev->id) {
  67         vi->has_id = true;
  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
  78 static void virtio_mem_pci_size_change_notify(Notifier *notifier, void *data)
  79 {
  80     VirtIOMEMPCI *pci_mem = container_of(notifier, VirtIOMEMPCI,
  81                                          size_change_notifier);
  82     DeviceState *dev = DEVICE(pci_mem);
  83     const uint64_t * const size_p = data;
  84     const char *id = NULL;
  85
  86     if (dev->id) {
  87         id = g_strdup(dev->id);
  88     }
  89
  90     qapi_event_send_memory_device_size_change(!!id, id, *size_p);
  91 }
  92
  93 static void virtio_mem_pci_class_init(ObjectClass *klass, void *data)
  94 {
  95     DeviceClass *dc = DEVICE_CLASS(klass);
  96     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
  97     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
  98     MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(klass);
  99
 100     k->realize = virtio_mem_pci_realize;
 101     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 102     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
 103     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_MEM;
 104     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
 105     pcidev_k->class_id = PCI_CLASS_OTHERS;
 106
 107     mdc->get_addr = virtio_mem_pci_get_addr;
 108     mdc->set_addr = virtio_mem_pci_set_addr;
 109     mdc->get_plugged_size = virtio_mem_pci_get_plugged_size;
 110     mdc->get_memory_region = virtio_mem_pci_get_memory_region;
 111     mdc->fill_device_info = virtio_mem_pci_fill_device_info;
 112 }
 113
 114 static void virtio_mem_pci_instance_init(Object *obj)
 115 {
 116     VirtIOMEMPCI *dev = VIRTIO_MEM_PCI(obj);
 117     VirtIOMEMClass *vmc;
 118     VirtIOMEM *vmem;
 119
 120     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 121                                 TYPE_VIRTIO_MEM);
 122
 123     dev->size_change_notifier.notify = virtio_mem_pci_size_change_notify;
 124     vmem = VIRTIO_MEM(&dev->vdev);
 125     vmc = VIRTIO_MEM_GET_CLASS(vmem);
 126     /*
 127      * We never remove the notifier again, as we expect both devices to
 128      * disappear at the same time.
 129      */
 130     vmc->add_size_change_notifier(vmem, &dev->size_change_notifier);
 131
 132     object_property_add_alias(obj, VIRTIO_MEM_BLOCK_SIZE_PROP,
 133                               OBJECT(&dev->vdev), VIRTIO_MEM_BLOCK_SIZE_PROP);
 134     object_property_add_alias(obj, VIRTIO_MEM_SIZE_PROP, OBJECT(&dev->vdev),
 135                               VIRTIO_MEM_SIZE_PROP);
 136     object_property_add_alias(obj, VIRTIO_MEM_REQUESTED_SIZE_PROP,
 137                               OBJECT(&dev->vdev),
 138                               VIRTIO_MEM_REQUESTED_SIZE_PROP);
 139 }
 140
 141 static const VirtioPCIDeviceTypeInfo virtio_mem_pci_info = {
 142     .base_name = TYPE_VIRTIO_MEM_PCI,
 143     .generic_name = "virtio-mem-pci",
 144     .instance_size = sizeof(VirtIOMEMPCI),
 145     .instance_init = virtio_mem_pci_instance_init,
 146     .class_init = virtio_mem_pci_class_init,
 147     .interfaces = (InterfaceInfo[]) {
 148         { TYPE_MEMORY_DEVICE },
 149         { }
 150     },
 151 };
 152
 153 static void virtio_mem_pci_register_types(void)
 154 {
 155     virtio_pci_types_register(&virtio_mem_pci_info);
 156 }
 157 type_init(virtio_mem_pci_register_types)