virtio-mem-pci.c (5480B)
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)