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25#include "qemu/osdep.h"
26#include "qapi/error.h"
27#include "qapi/visitor.h"
28#include "hw/mem/nvdimm.h"
29
30static void nvdimm_get_label_size(Object *obj, Visitor *v, const char *name,
31 void *opaque, Error **errp)
32{
33 NVDIMMDevice *nvdimm = NVDIMM(obj);
34 uint64_t value = nvdimm->label_size;
35
36 visit_type_size(v, name, &value, errp);
37}
38
39static void nvdimm_set_label_size(Object *obj, Visitor *v, const char *name,
40 void *opaque, Error **errp)
41{
42 NVDIMMDevice *nvdimm = NVDIMM(obj);
43 Error *local_err = NULL;
44 uint64_t value;
45
46 if (nvdimm->nvdimm_mr) {
47 error_setg(&local_err, "cannot change property value");
48 goto out;
49 }
50
51 visit_type_size(v, name, &value, &local_err);
52 if (local_err) {
53 goto out;
54 }
55 if (value < MIN_NAMESPACE_LABEL_SIZE) {
56 error_setg(&local_err, "Property '%s.%s' (0x%" PRIx64 ") is required"
57 " at least 0x%lx", object_get_typename(obj),
58 name, value, MIN_NAMESPACE_LABEL_SIZE);
59 goto out;
60 }
61
62 nvdimm->label_size = value;
63out:
64 error_propagate(errp, local_err);
65}
66
67static void nvdimm_init(Object *obj)
68{
69 object_property_add(obj, NVDIMM_LABEL_SIZE_PROP, "int",
70 nvdimm_get_label_size, nvdimm_set_label_size, NULL,
71 NULL, NULL);
72}
73
74static void nvdimm_finalize(Object *obj)
75{
76 NVDIMMDevice *nvdimm = NVDIMM(obj);
77
78 g_free(nvdimm->nvdimm_mr);
79}
80
81static void nvdimm_prepare_memory_region(NVDIMMDevice *nvdimm, Error **errp)
82{
83 PCDIMMDevice *dimm = PC_DIMM(nvdimm);
84 uint64_t align, pmem_size, size;
85 MemoryRegion *mr;
86
87 g_assert(!nvdimm->nvdimm_mr);
88
89 if (!dimm->hostmem) {
90 error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property must be set");
91 return;
92 }
93
94 mr = host_memory_backend_get_memory(dimm->hostmem);
95 align = memory_region_get_alignment(mr);
96 size = memory_region_size(mr);
97
98 pmem_size = size - nvdimm->label_size;
99 nvdimm->label_data = memory_region_get_ram_ptr(mr) + pmem_size;
100 pmem_size = QEMU_ALIGN_DOWN(pmem_size, align);
101
102 if (size <= nvdimm->label_size || !pmem_size) {
103 HostMemoryBackend *hostmem = dimm->hostmem;
104 char *path = object_get_canonical_path_component(OBJECT(hostmem));
105
106 error_setg(errp, "the size of memdev %s (0x%" PRIx64 ") is too "
107 "small to contain nvdimm label (0x%" PRIx64 ") and "
108 "aligned PMEM (0x%" PRIx64 ")",
109 path, memory_region_size(mr), nvdimm->label_size, align);
110 g_free(path);
111 return;
112 }
113
114 nvdimm->nvdimm_mr = g_new(MemoryRegion, 1);
115 memory_region_init_alias(nvdimm->nvdimm_mr, OBJECT(dimm),
116 "nvdimm-memory", mr, 0, pmem_size);
117 nvdimm->nvdimm_mr->align = align;
118}
119
120static MemoryRegion *nvdimm_get_memory_region(PCDIMMDevice *dimm, Error **errp)
121{
122 NVDIMMDevice *nvdimm = NVDIMM(dimm);
123 Error *local_err = NULL;
124
125 if (!nvdimm->nvdimm_mr) {
126 nvdimm_prepare_memory_region(nvdimm, &local_err);
127 if (local_err) {
128 error_propagate(errp, local_err);
129 return NULL;
130 }
131 }
132 return nvdimm->nvdimm_mr;
133}
134
135static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp)
136{
137 NVDIMMDevice *nvdimm = NVDIMM(dimm);
138
139 if (!nvdimm->nvdimm_mr) {
140 nvdimm_prepare_memory_region(nvdimm, errp);
141 }
142}
143
144
145
146
147
148static void nvdimm_validate_rw_label_data(NVDIMMDevice *nvdimm, uint64_t size,
149 uint64_t offset)
150{
151 assert((nvdimm->label_size >= size + offset) && (offset + size > offset));
152}
153
154static void nvdimm_read_label_data(NVDIMMDevice *nvdimm, void *buf,
155 uint64_t size, uint64_t offset)
156{
157 nvdimm_validate_rw_label_data(nvdimm, size, offset);
158
159 memcpy(buf, nvdimm->label_data + offset, size);
160}
161
162static void nvdimm_write_label_data(NVDIMMDevice *nvdimm, const void *buf,
163 uint64_t size, uint64_t offset)
164{
165 MemoryRegion *mr;
166 PCDIMMDevice *dimm = PC_DIMM(nvdimm);
167 uint64_t backend_offset;
168
169 nvdimm_validate_rw_label_data(nvdimm, size, offset);
170
171 memcpy(nvdimm->label_data + offset, buf, size);
172
173 mr = host_memory_backend_get_memory(dimm->hostmem);
174 backend_offset = memory_region_size(mr) - nvdimm->label_size + offset;
175 memory_region_set_dirty(mr, backend_offset, size);
176}
177
178static Property nvdimm_properties[] = {
179 DEFINE_PROP_BOOL(NVDIMM_UNARMED_PROP, NVDIMMDevice, unarmed, false),
180 DEFINE_PROP_END_OF_LIST(),
181};
182
183static void nvdimm_class_init(ObjectClass *oc, void *data)
184{
185 PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc);
186 NVDIMMClass *nvc = NVDIMM_CLASS(oc);
187 DeviceClass *dc = DEVICE_CLASS(oc);
188
189 ddc->realize = nvdimm_realize;
190 ddc->get_memory_region = nvdimm_get_memory_region;
191 dc->props = nvdimm_properties;
192
193 nvc->read_label_data = nvdimm_read_label_data;
194 nvc->write_label_data = nvdimm_write_label_data;
195}
196
197static TypeInfo nvdimm_info = {
198 .name = TYPE_NVDIMM,
199 .parent = TYPE_PC_DIMM,
200 .class_size = sizeof(NVDIMMClass),
201 .class_init = nvdimm_class_init,
202 .instance_size = sizeof(NVDIMMDevice),
203 .instance_init = nvdimm_init,
204 .instance_finalize = nvdimm_finalize,
205};
206
207static void nvdimm_register_types(void)
208{
209 type_register_static(&nvdimm_info);
210}
211
212type_init(nvdimm_register_types)
213