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 "qapi/error.h"
  27 #include "qapi/visitor.h"
  28 #include "hw/mem/nvdimm.h"
  29
  30 static 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
  39 static 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 (memory_region_size(&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;
  63 out:
  64     error_propagate(errp, local_err);
  65 }
  66
  67 static void nvdimm_init(Object *obj)
  68 {
  69     object_property_add(obj, "label-size", "int",
  70                         nvdimm_get_label_size, nvdimm_set_label_size, NULL,
  71                         NULL, NULL);
  72 }
  73
  74 static MemoryRegion *nvdimm_get_memory_region(PCDIMMDevice *dimm, Error **errp)
  75 {
  76     NVDIMMDevice *nvdimm = NVDIMM(dimm);
  77
  78     return &nvdimm->nvdimm_mr;
  79 }
  80
  81 static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp)
  82 {
  83     MemoryRegion *mr = host_memory_backend_get_memory(dimm->hostmem, errp);
  84     NVDIMMDevice *nvdimm = NVDIMM(dimm);
  85     uint64_t align, pmem_size, size = memory_region_size(mr);
  86
  87     align = memory_region_get_alignment(mr);
  88
  89     pmem_size = size - nvdimm->label_size;
  90     nvdimm->label_data = memory_region_get_ram_ptr(mr) + pmem_size;
  91     pmem_size = QEMU_ALIGN_DOWN(pmem_size, align);
  92
  93     if (size <= nvdimm->label_size || !pmem_size) {
  94         HostMemoryBackend *hostmem = dimm->hostmem;
  95         char *path = object_get_canonical_path_component(OBJECT(hostmem));
  96
  97         error_setg(errp, "the size of memdev %s (0x%" PRIx64 ") is too "
  98                    "small to contain nvdimm label (0x%" PRIx64 ") and "
  99                    "aligned PMEM (0x%" PRIx64 ")",
 100                    path, memory_region_size(mr), nvdimm->label_size, align);
 101         g_free(path);
 102         return;
 103     }
 104
 105     memory_region_init_alias(&nvdimm->nvdimm_mr, OBJECT(dimm),
 106                              "nvdimm-memory", mr, 0, pmem_size);
 107     nvdimm->nvdimm_mr.align = align;
 108 }
 109
 110 /*
 111  * the caller should check the input parameters before calling
 112  * label read/write functions.
 113  */
 114 static void nvdimm_validate_rw_label_data(NVDIMMDevice *nvdimm, uint64_t size,
 115                                         uint64_t offset)
 116 {
 117     assert((nvdimm->label_size >= size + offset) && (offset + size > offset));
 118 }
 119
 120 static void nvdimm_read_label_data(NVDIMMDevice *nvdimm, void *buf,
 121                                    uint64_t size, uint64_t offset)
 122 {
 123     nvdimm_validate_rw_label_data(nvdimm, size, offset);
 124
 125     memcpy(buf, nvdimm->label_data + offset, size);
 126 }
 127
 128 static void nvdimm_write_label_data(NVDIMMDevice *nvdimm, const void *buf,
 129                                     uint64_t size, uint64_t offset)
 130 {
 131     MemoryRegion *mr;
 132     PCDIMMDevice *dimm = PC_DIMM(nvdimm);
 133     uint64_t backend_offset;
 134
 135     nvdimm_validate_rw_label_data(nvdimm, size, offset);
 136
 137     memcpy(nvdimm->label_data + offset, buf, size);
 138
 139     mr = host_memory_backend_get_memory(dimm->hostmem, &error_abort);
 140     backend_offset = memory_region_size(mr) - nvdimm->label_size + offset;
 141     memory_region_set_dirty(mr, backend_offset, size);
 142 }
 143
 144 static MemoryRegion *nvdimm_get_vmstate_memory_region(PCDIMMDevice *dimm)
 145 {
 146     return host_memory_backend_get_memory(dimm->hostmem, &error_abort);
 147 }
 148
 149 static void nvdimm_class_init(ObjectClass *oc, void *data)
 150 {
 151     PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc);
 152     NVDIMMClass *nvc = NVDIMM_CLASS(oc);
 153
 154     ddc->realize = nvdimm_realize;
 155     ddc->get_memory_region = nvdimm_get_memory_region;
 156     ddc->get_vmstate_memory_region = nvdimm_get_vmstate_memory_region;
 157
 158     nvc->read_label_data = nvdimm_read_label_data;
 159     nvc->write_label_data = nvdimm_write_label_data;
 160 }
 161
 162 static TypeInfo nvdimm_info = {
 163     .name          = TYPE_NVDIMM,
 164     .parent        = TYPE_PC_DIMM,
 165     .class_size    = sizeof(NVDIMMClass),
 166     .class_init    = nvdimm_class_init,
 167     .instance_size = sizeof(NVDIMMDevice),
 168     .instance_init = nvdimm_init,
 169 };
 170
 171 static void nvdimm_register_types(void)
 172 {
 173     type_register_static(&nvdimm_info);
 174 }
 175
 176 type_init(nvdimm_register_types)