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 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/pmem.h"
  27 #include "qapi/error.h"
  28 #include "qapi/visitor.h"
  29 #include "hw/mem/nvdimm.h"
  30 #include "hw/mem/memory-device.h"
  31
  32 static void nvdimm_get_label_size(Object *obj, Visitor *v, const char *name,
  33                                   void *opaque, Error **errp)
  34 {
  35     NVDIMMDevice *nvdimm = NVDIMM(obj);
  36     uint64_t value = nvdimm->label_size;
  37
  38     visit_type_size(v, name, &value, errp);
  39 }
  40
  41 static void nvdimm_set_label_size(Object *obj, Visitor *v, const char *name,
  42                                   void *opaque, Error **errp)
  43 {
  44     NVDIMMDevice *nvdimm = NVDIMM(obj);
  45     Error *local_err = NULL;
  46     uint64_t value;
  47
  48     if (nvdimm->nvdimm_mr) {
  49         error_setg(&local_err, "cannot change property value");
  50         goto out;
  51     }
  52
  53     visit_type_size(v, name, &value, &local_err);
  54     if (local_err) {
  55         goto out;
  56     }
  57     if (value < MIN_NAMESPACE_LABEL_SIZE) {
  58         error_setg(&local_err, "Property '%s.%s' (0x%" PRIx64 ") is required"
  59                    " at least 0x%lx", object_get_typename(obj),
  60                    name, value, MIN_NAMESPACE_LABEL_SIZE);
  61         goto out;
  62     }
  63
  64     nvdimm->label_size = value;
  65 out:
  66     error_propagate(errp, local_err);
  67 }
  68
  69 static void nvdimm_init(Object *obj)
  70 {
  71     object_property_add(obj, NVDIMM_LABEL_SIZE_PROP, "int",
  72                         nvdimm_get_label_size, nvdimm_set_label_size, NULL,
  73                         NULL, NULL);
  74 }
  75
  76 static void nvdimm_finalize(Object *obj)
  77 {
  78     NVDIMMDevice *nvdimm = NVDIMM(obj);
  79
  80     g_free(nvdimm->nvdimm_mr);
  81 }
  82
  83 static void nvdimm_prepare_memory_region(NVDIMMDevice *nvdimm, Error **errp)
  84 {
  85     PCDIMMDevice *dimm = PC_DIMM(nvdimm);
  86     uint64_t align, pmem_size, size;
  87     MemoryRegion *mr;
  88
  89     g_assert(!nvdimm->nvdimm_mr);
  90
  91     if (!dimm->hostmem) {
  92         error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property must be set");
  93         return;
  94     }
  95
  96     mr = host_memory_backend_get_memory(dimm->hostmem);
  97     align = memory_region_get_alignment(mr);
  98     size = memory_region_size(mr);
  99
 100     pmem_size = size - nvdimm->label_size;
 101     nvdimm->label_data = memory_region_get_ram_ptr(mr) + pmem_size;
 102     pmem_size = QEMU_ALIGN_DOWN(pmem_size, align);
 103
 104     if (size <= nvdimm->label_size || !pmem_size) {
 105         HostMemoryBackend *hostmem = dimm->hostmem;
 106         char *path = object_get_canonical_path_component(OBJECT(hostmem));
 107
 108         error_setg(errp, "the size of memdev %s (0x%" PRIx64 ") is too "
 109                    "small to contain nvdimm label (0x%" PRIx64 ") and "
 110                    "aligned PMEM (0x%" PRIx64 ")",
 111                    path, memory_region_size(mr), nvdimm->label_size, align);
 112         g_free(path);
 113         return;
 114     }
 115
 116     nvdimm->nvdimm_mr = g_new(MemoryRegion, 1);
 117     memory_region_init_alias(nvdimm->nvdimm_mr, OBJECT(dimm),
 118                              "nvdimm-memory", mr, 0, pmem_size);
 119     nvdimm->nvdimm_mr->align = align;
 120 }
 121
 122 static MemoryRegion *nvdimm_md_get_memory_region(MemoryDeviceState *md,
 123                                                  Error **errp)
 124 {
 125     NVDIMMDevice *nvdimm = NVDIMM(md);
 126     Error *local_err = NULL;
 127
 128     if (!nvdimm->nvdimm_mr) {
 129         nvdimm_prepare_memory_region(nvdimm, &local_err);
 130         if (local_err) {
 131             error_propagate(errp, local_err);
 132             return NULL;
 133         }
 134     }
 135     return nvdimm->nvdimm_mr;
 136 }
 137
 138 static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp)
 139 {
 140     NVDIMMDevice *nvdimm = NVDIMM(dimm);
 141
 142     if (!nvdimm->nvdimm_mr) {
 143         nvdimm_prepare_memory_region(nvdimm, errp);
 144     }
 145 }
 146
 147 /*
 148  * the caller should check the input parameters before calling
 149  * label read/write functions.
 150  */
 151 static void nvdimm_validate_rw_label_data(NVDIMMDevice *nvdimm, uint64_t size,
 152                                         uint64_t offset)
 153 {
 154     assert((nvdimm->label_size >= size + offset) && (offset + size > offset));
 155 }
 156
 157 static void nvdimm_read_label_data(NVDIMMDevice *nvdimm, void *buf,
 158                                    uint64_t size, uint64_t offset)
 159 {
 160     nvdimm_validate_rw_label_data(nvdimm, size, offset);
 161
 162     memcpy(buf, nvdimm->label_data + offset, size);
 163 }
 164
 165 static void nvdimm_write_label_data(NVDIMMDevice *nvdimm, const void *buf,
 166                                     uint64_t size, uint64_t offset)
 167 {
 168     MemoryRegion *mr;
 169     PCDIMMDevice *dimm = PC_DIMM(nvdimm);
 170     bool is_pmem = object_property_get_bool(OBJECT(dimm->hostmem),
 171                                             "pmem", NULL);
 172     uint64_t backend_offset;
 173
 174     nvdimm_validate_rw_label_data(nvdimm, size, offset);
 175
 176     if (!is_pmem) {
 177         memcpy(nvdimm->label_data + offset, buf, size);
 178     } else {
 179         pmem_memcpy_persist(nvdimm->label_data + offset, buf, size);
 180     }
 181
 182     mr = host_memory_backend_get_memory(dimm->hostmem);
 183     backend_offset = memory_region_size(mr) - nvdimm->label_size + offset;
 184     memory_region_set_dirty(mr, backend_offset, size);
 185 }
 186
 187 static Property nvdimm_properties[] = {
 188     DEFINE_PROP_BOOL(NVDIMM_UNARMED_PROP, NVDIMMDevice, unarmed, false),
 189     DEFINE_PROP_END_OF_LIST(),
 190 };
 191
 192 static void nvdimm_class_init(ObjectClass *oc, void *data)
 193 {
 194     PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc);
 195     MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(oc);
 196     NVDIMMClass *nvc = NVDIMM_CLASS(oc);
 197     DeviceClass *dc = DEVICE_CLASS(oc);
 198
 199     ddc->realize = nvdimm_realize;
 200     mdc->get_memory_region = nvdimm_md_get_memory_region;
 201     dc->props = nvdimm_properties;
 202
 203     nvc->read_label_data = nvdimm_read_label_data;
 204     nvc->write_label_data = nvdimm_write_label_data;
 205 }
 206
 207 static TypeInfo nvdimm_info = {
 208     .name          = TYPE_NVDIMM,
 209     .parent        = TYPE_PC_DIMM,
 210     .class_size    = sizeof(NVDIMMClass),
 211     .class_init    = nvdimm_class_init,
 212     .instance_size = sizeof(NVDIMMDevice),
 213     .instance_init = nvdimm_init,
 214     .instance_finalize = nvdimm_finalize,
 215 };
 216
 217 static void nvdimm_register_types(void)
 218 {
 219     type_register_static(&nvdimm_info);
 220 }
 221
 222 type_init(nvdimm_register_types)