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), "realized", true, 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), VIRTIO_MEM_ADDR_PROP, addr, 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) 158