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1 /*
2 * virtio-mem CCW implementation
3 *
4 * Copyright (C) 2024 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 "hw/core/qdev-properties.h"
15 #include "qapi/error.h"
16 #include "qemu/module.h"
17 #include "virtio-ccw-mem.h"
18 #include "hw/mem/memory-device.h"
19 #include "qapi/qapi-events-machine.h"
20 #include "qapi/qapi-events-misc.h"
21
22 static void virtio_ccw_mem_realize(VirtioCcwDevice *ccw_dev, Error **errp)
23 {
24 VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(ccw_dev);
25 DeviceState *vdev = DEVICE(&dev->vdev);
26
27 qdev_realize(vdev, BUS(&ccw_dev->bus), errp);
28 }
29
30 static void virtio_ccw_mem_set_addr(MemoryDeviceState *md, uint64_t addr,
31 Error **errp)
32 {
33 object_property_set_uint(OBJECT(md), VIRTIO_MEM_ADDR_PROP, addr, errp);
34 }
35
36 static uint64_t virtio_ccw_mem_get_addr(const MemoryDeviceState *md)
37 {
38 return object_property_get_uint(OBJECT(md), VIRTIO_MEM_ADDR_PROP,
39 &error_abort);
40 }
41
42 static MemoryRegion *virtio_ccw_mem_get_memory_region(MemoryDeviceState *md,
43 Error **errp)
44 {
45 VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(md);
46 VirtIOMEM *vmem = &dev->vdev;
47 VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem);
48
49 return vmc->get_memory_region(vmem, errp);
50 }
51
52 static void virtio_ccw_mem_decide_memslots(MemoryDeviceState *md,
53 unsigned int limit)
54 {
55 VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(md);
56 VirtIOMEM *vmem = VIRTIO_MEM(&dev->vdev);
57 VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem);
58
59 vmc->decide_memslots(vmem, limit);
60 }
61
62 static unsigned int virtio_ccw_mem_get_memslots(MemoryDeviceState *md)
63 {
64 VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(md);
65 VirtIOMEM *vmem = VIRTIO_MEM(&dev->vdev);
66 VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem);
67
68 return vmc->get_memslots(vmem);
69 }
70
71 static uint64_t virtio_ccw_mem_get_plugged_size(const MemoryDeviceState *md,
72 Error **errp)
73 {
74 return object_property_get_uint(OBJECT(md), VIRTIO_MEM_SIZE_PROP,
75 errp);
76 }
77
78 static void virtio_ccw_mem_fill_device_info(const MemoryDeviceState *md,
79 MemoryDeviceInfo *info)
80 {
81 VirtioMEMDeviceInfo *vi = g_new0(VirtioMEMDeviceInfo, 1);
82 VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(md);
83 VirtIOMEM *vmem = &dev->vdev;
84 VirtIOMEMClass *vpc = VIRTIO_MEM_GET_CLASS(vmem);
85 DeviceState *vdev = DEVICE(md);
86
87 if (vdev->id) {
88 vi->id = g_strdup(vdev->id);
89 }
90
91 /* let the real device handle everything else */
92 vpc->fill_device_info(vmem, vi);
93
94 info->u.virtio_mem.data = vi;
95 info->type = MEMORY_DEVICE_INFO_KIND_VIRTIO_MEM;
96 }
97
98 static uint64_t virtio_ccw_mem_get_min_alignment(const MemoryDeviceState *md)
99 {
100 return object_property_get_uint(OBJECT(md), VIRTIO_MEM_BLOCK_SIZE_PROP,
101 &error_abort);
102 }
103
104 static void virtio_ccw_mem_size_change_notify(Notifier *notifier, void *data)
105 {
106 VirtIOMEMCcw *dev = container_of(notifier, VirtIOMEMCcw,
107 size_change_notifier);
108 DeviceState *vdev = DEVICE(dev);
109 char *qom_path = object_get_canonical_path(OBJECT(dev));
110 const uint64_t * const size_p = data;
111
112 qapi_event_send_memory_device_size_change(vdev->id, *size_p, qom_path);
113 g_free(qom_path);
114 }
115
116 static void virtio_ccw_mem_unplug_request_check(VirtIOMDCcw *vmd, Error **errp)
117 {
118 VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(vmd);
119 VirtIOMEM *vmem = &dev->vdev;
120 VirtIOMEMClass *vpc = VIRTIO_MEM_GET_CLASS(vmem);
121
122 vpc->unplug_request_check(vmem, errp);
123 }
124
125 static void virtio_ccw_mem_get_requested_size(Object *obj, Visitor *v,
126 const char *name, void *opaque,
127 Error **errp)
128 {
129 VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(obj);
130
131 object_property_get(OBJECT(&dev->vdev), name, v, errp);
132 }
133
134 static void virtio_ccw_mem_set_requested_size(Object *obj, Visitor *v,
135 const char *name, void *opaque,
136 Error **errp)
137 {
138 VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(obj);
139 DeviceState *vdev = DEVICE(obj);
140
141 /*
142 * If we passed virtio_ccw_mem_unplug_request_check(), making sure that
143 * the requested size is 0, don't allow modifying the requested size
144 * anymore, otherwise the VM might end up hotplugging memory before
145 * handling the unplug request.
146 */
147 if (vdev->pending_deleted_event) {
148 error_setg(errp, "'%s' cannot be changed if the device is in the"
149 " process of unplug", name);
150 return;
151 }
152
153 object_property_set(OBJECT(&dev->vdev), name, v, errp);
154 }
155
156 static const Property virtio_ccw_mem_properties[] = {
157 DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
158 VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
159 DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev,
160 VIRTIO_CCW_MAX_REV),
161 };
162
163 static void virtio_ccw_mem_class_init(ObjectClass *klass, const void *data)
164 {
165 DeviceClass *dc = DEVICE_CLASS(klass);
166 VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
167 MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(klass);
168 VirtIOMDCcwClass *vmdc = VIRTIO_MD_CCW_CLASS(klass);
169
170 k->realize = virtio_ccw_mem_realize;
171 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
172 device_class_set_props(dc, virtio_ccw_mem_properties);
173
174 mdc->get_addr = virtio_ccw_mem_get_addr;
175 mdc->set_addr = virtio_ccw_mem_set_addr;
176 mdc->get_plugged_size = virtio_ccw_mem_get_plugged_size;
177 mdc->get_memory_region = virtio_ccw_mem_get_memory_region;
178 mdc->decide_memslots = virtio_ccw_mem_decide_memslots;
179 mdc->get_memslots = virtio_ccw_mem_get_memslots;
180 mdc->fill_device_info = virtio_ccw_mem_fill_device_info;
181 mdc->get_min_alignment = virtio_ccw_mem_get_min_alignment;
182
183 vmdc->unplug_request_check = virtio_ccw_mem_unplug_request_check;
184 }
185
186 static void virtio_ccw_mem_instance_init(Object *obj)
187 {
188 VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(obj);
189 VirtIOMEMClass *vmc;
190 VirtIOMEM *vmem;
191
192 virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
193 TYPE_VIRTIO_MEM);
194
195 dev->size_change_notifier.notify = virtio_ccw_mem_size_change_notify;
196 vmem = &dev->vdev;
197 vmc = VIRTIO_MEM_GET_CLASS(vmem);
198 /*
199 * We never remove the notifier again, as we expect both devices to
200 * disappear at the same time.
201 */
202 vmc->add_size_change_notifier(vmem, &dev->size_change_notifier);
203
204 object_property_add_alias(obj, VIRTIO_MEM_BLOCK_SIZE_PROP,
205 OBJECT(&dev->vdev), VIRTIO_MEM_BLOCK_SIZE_PROP);
206 object_property_add_alias(obj, VIRTIO_MEM_SIZE_PROP, OBJECT(&dev->vdev),
207 VIRTIO_MEM_SIZE_PROP);
208 object_property_add(obj, VIRTIO_MEM_REQUESTED_SIZE_PROP, "size",
209 virtio_ccw_mem_get_requested_size,
210 virtio_ccw_mem_set_requested_size, NULL, NULL);
211 }
212
213 static const TypeInfo virtio_ccw_mem = {
214 .name = TYPE_VIRTIO_MEM_CCW,
215 .parent = TYPE_VIRTIO_MD_CCW,
216 .instance_size = sizeof(VirtIOMEMCcw),
217 .instance_init = virtio_ccw_mem_instance_init,
218 .class_init = virtio_ccw_mem_class_init,
219 };
220
221 static void virtio_ccw_mem_register_types(void)
222 {
223 type_register_static(&virtio_ccw_mem);
224 }
225 type_init(virtio_ccw_mem_register_types)