hw/mem/nvdimm.c

   1 /*
   2  * Non-Volatile Dual In-line Memory Module Virtualization Implementation
   3  *
   4  * Copyright(C) 2015 Intel Corporation.
   5  *
   6  * Author:
   7  *  Xiao Guangrong <guangrong.xiao@linux.intel.com>
   8  *
   9  * Currently, it only supports PMEM Virtualization.
  10  *
  11  * This library is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU Lesser General Public
  13  * License as published by the Free Software Foundation; either
  14  * version 2.1 of the License, or (at your option) any later version.
  15  *
  16  * This library is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public
  22  * License along with this library; if not, see <http://www.gnu.org/licenses/>
  23  */
  24
  25 #include "qemu/osdep.h"
  26 #include "qemu/module.h"
  27 #include "qemu/pmem.h"
  28 #include "qapi/error.h"
  29 #include "qapi/visitor.h"
  30 #include "hw/mem/nvdimm.h"
  31 #include "hw/qdev-properties.h"
  32 #include "hw/mem/memory-device.h"
  33 #include "sysemu/hostmem.h"
  34
  35 static void nvdimm_get_label_size(Object *obj, Visitor *v, const char *name,
  36                                   void *opaque, Error **errp)
  37 {
  38     NVDIMMDevice *nvdimm = NVDIMM(obj);
  39     uint64_t value = nvdimm->label_size;
  40
  41     visit_type_size(v, name, &value, errp);
  42 }
  43
  44 static void nvdimm_set_label_size(Object *obj, Visitor *v, const char *name,
  45                                   void *opaque, Error **errp)
  46 {
  47     NVDIMMDevice *nvdimm = NVDIMM(obj);
  48     uint64_t value;
  49
  50     if (nvdimm->nvdimm_mr) {
  51         error_setg(errp, "cannot change property value");
  52         return;
  53     }
  54
  55     if (!visit_type_size(v, name, &value, errp)) {
  56         return;
  57     }
  58     if (value < MIN_NAMESPACE_LABEL_SIZE) {
  59         error_setg(errp, "Property '%s.%s' (0x%" PRIx64 ") is required"
  60                    " at least 0x%lx", object_get_typename(obj), name, value,
  61                    MIN_NAMESPACE_LABEL_SIZE);
  62         return;
  63     }
  64
  65     nvdimm->label_size = value;
  66 }
  67
  68 static void nvdimm_get_uuid(Object *obj, Visitor *v, const char *name,
  69                                   void *opaque, Error **errp)
  70 {
  71     NVDIMMDevice *nvdimm = NVDIMM(obj);
  72     char *value = NULL;
  73
  74     value = qemu_uuid_unparse_strdup(&nvdimm->uuid);
  75
  76     visit_type_str(v, name, &value, errp);
  77     g_free(value);
  78 }
  79
  80
  81 static void nvdimm_set_uuid(Object *obj, Visitor *v, const char *name,
  82                                   void *opaque, Error **errp)
  83 {
  84     NVDIMMDevice *nvdimm = NVDIMM(obj);
  85     char *value;
  86
  87     if (!visit_type_str(v, name, &value, errp)) {
  88         return;
  89     }
  90
  91     if (qemu_uuid_parse(value, &nvdimm->uuid) != 0) {
  92         error_setg(errp, "Property '%s.%s' has invalid value",
  93                    object_get_typename(obj), name);
  94     }
  95
  96     g_free(value);
  97 }
  98
  99
 100 static void nvdimm_init(Object *obj)
 101 {
 102     object_property_add(obj, NVDIMM_LABEL_SIZE_PROP, "int",
 103                         nvdimm_get_label_size, nvdimm_set_label_size, NULL,
 104                         NULL);
 105
 106     object_property_add(obj, NVDIMM_UUID_PROP, "QemuUUID", nvdimm_get_uuid,
 107                         nvdimm_set_uuid, NULL, NULL);
 108 }
 109
 110 static void nvdimm_finalize(Object *obj)
 111 {
 112     NVDIMMDevice *nvdimm = NVDIMM(obj);
 113
 114     g_free(nvdimm->nvdimm_mr);
 115 }
 116
 117 static void nvdimm_prepare_memory_region(NVDIMMDevice *nvdimm, Error **errp)
 118 {
 119     PCDIMMDevice *dimm = PC_DIMM(nvdimm);
 120     uint64_t align, pmem_size, size;
 121     MemoryRegion *mr;
 122
 123     g_assert(!nvdimm->nvdimm_mr);
 124
 125     if (!dimm->hostmem) {
 126         error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property must be set");
 127         return;
 128     }
 129
 130     mr = host_memory_backend_get_memory(dimm->hostmem);
 131     align = memory_region_get_alignment(mr);
 132     size = memory_region_size(mr);
 133
 134     pmem_size = size - nvdimm->label_size;
 135     nvdimm->label_data = memory_region_get_ram_ptr(mr) + pmem_size;
 136     pmem_size = QEMU_ALIGN_DOWN(pmem_size, align);
 137
 138     if (size <= nvdimm->label_size || !pmem_size) {
 139         HostMemoryBackend *hostmem = dimm->hostmem;
 140
 141         error_setg(errp, "the size of memdev %s (0x%" PRIx64 ") is too "
 142                    "small to contain nvdimm label (0x%" PRIx64 ") and "
 143                    "aligned PMEM (0x%" PRIx64 ")",
 144                    object_get_canonical_path_component(OBJECT(hostmem)),
 145                    memory_region_size(mr), nvdimm->label_size, align);
 146         return;
 147     }
 148
 149     if (!nvdimm->unarmed && memory_region_is_rom(mr)) {
 150         HostMemoryBackend *hostmem = dimm->hostmem;
 151
 152         error_setg(errp, "'unarmed' property must be off since memdev %s "
 153                    "is read-only",
 154                    object_get_canonical_path_component(OBJECT(hostmem)));
 155         return;
 156     }
 157
 158     nvdimm->nvdimm_mr = g_new(MemoryRegion, 1);
 159     memory_region_init_alias(nvdimm->nvdimm_mr, OBJECT(dimm),
 160                              "nvdimm-memory", mr, 0, pmem_size);
 161     memory_region_set_nonvolatile(nvdimm->nvdimm_mr, true);
 162     nvdimm->nvdimm_mr->align = align;
 163 }
 164
 165 static MemoryRegion *nvdimm_md_get_memory_region(MemoryDeviceState *md,
 166                                                  Error **errp)
 167 {
 168     NVDIMMDevice *nvdimm = NVDIMM(md);
 169     Error *local_err = NULL;
 170
 171     if (!nvdimm->nvdimm_mr) {
 172         nvdimm_prepare_memory_region(nvdimm, &local_err);
 173         if (local_err) {
 174             error_propagate(errp, local_err);
 175             return NULL;
 176         }
 177     }
 178     return nvdimm->nvdimm_mr;
 179 }
 180
 181 static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp)
 182 {
 183     NVDIMMDevice *nvdimm = NVDIMM(dimm);
 184
 185     if (!nvdimm->nvdimm_mr) {
 186         nvdimm_prepare_memory_region(nvdimm, errp);
 187     }
 188 }
 189
 190 /*
 191  * the caller should check the input parameters before calling
 192  * label read/write functions.
 193  */
 194 static void nvdimm_validate_rw_label_data(NVDIMMDevice *nvdimm, uint64_t size,
 195                                         uint64_t offset)
 196 {
 197     assert((nvdimm->label_size >= size + offset) && (offset + size > offset));
 198 }
 199
 200 static void nvdimm_read_label_data(NVDIMMDevice *nvdimm, void *buf,
 201                                    uint64_t size, uint64_t offset)
 202 {
 203     nvdimm_validate_rw_label_data(nvdimm, size, offset);
 204
 205     memcpy(buf, nvdimm->label_data + offset, size);
 206 }
 207
 208 static void nvdimm_write_label_data(NVDIMMDevice *nvdimm, const void *buf,
 209                                     uint64_t size, uint64_t offset)
 210 {
 211     MemoryRegion *mr;
 212     PCDIMMDevice *dimm = PC_DIMM(nvdimm);
 213     bool is_pmem = object_property_get_bool(OBJECT(dimm->hostmem),
 214                                             "pmem", NULL);
 215     uint64_t backend_offset;
 216
 217     nvdimm_validate_rw_label_data(nvdimm, size, offset);
 218
 219     if (!is_pmem) {
 220         memcpy(nvdimm->label_data + offset, buf, size);
 221     } else {
 222         pmem_memcpy_persist(nvdimm->label_data + offset, buf, size);
 223     }
 224
 225     mr = host_memory_backend_get_memory(dimm->hostmem);
 226     backend_offset = memory_region_size(mr) - nvdimm->label_size + offset;
 227     memory_region_set_dirty(mr, backend_offset, size);
 228 }
 229
 230 static Property nvdimm_properties[] = {
 231     DEFINE_PROP_BOOL(NVDIMM_UNARMED_PROP, NVDIMMDevice, unarmed, false),
 232     DEFINE_PROP_END_OF_LIST(),
 233 };
 234
 235 static void nvdimm_class_init(ObjectClass *oc, void *data)
 236 {
 237     PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc);
 238     MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(oc);
 239     NVDIMMClass *nvc = NVDIMM_CLASS(oc);
 240     DeviceClass *dc = DEVICE_CLASS(oc);
 241
 242     ddc->realize = nvdimm_realize;
 243     mdc->get_memory_region = nvdimm_md_get_memory_region;
 244     device_class_set_props(dc, nvdimm_properties);
 245
 246     nvc->read_label_data = nvdimm_read_label_data;
 247     nvc->write_label_data = nvdimm_write_label_data;
 248     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
 249 }
 250
 251 static TypeInfo nvdimm_info = {
 252     .name          = TYPE_NVDIMM,
 253     .parent        = TYPE_PC_DIMM,
 254     .class_size    = sizeof(NVDIMMClass),
 255     .class_init    = nvdimm_class_init,
 256     .instance_size = sizeof(NVDIMMDevice),
 257     .instance_init = nvdimm_init,
 258     .instance_finalize = nvdimm_finalize,
 259 };
 260
 261 static void nvdimm_register_types(void)
 262 {
 263     type_register_static(&nvdimm_info);
 264 }
 265
 266 type_init(nvdimm_register_types)