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 bool nvdimm_get_unarmed(Object *obj, Error **errp) 68 { 69 NVDIMMDevice *nvdimm = NVDIMM(obj); 70 71 return nvdimm->unarmed; 72 } 73 74 static void nvdimm_set_unarmed(Object *obj, bool value, Error **errp) 75 { 76 NVDIMMDevice *nvdimm = NVDIMM(obj); 77 Error *local_err = NULL; 78 79 if (memory_region_size(&nvdimm->nvdimm_mr)) { 80 error_setg(&local_err, "cannot change property value"); 81 goto out; 82 } 83 84 nvdimm->unarmed = value; 85 86 out: 87 error_propagate(errp, local_err); 88 } 89 90 static void nvdimm_init(Object *obj) 91 { 92 object_property_add(obj, NVDIMM_LABEL_SIZE_PROP, "int", 93 nvdimm_get_label_size, nvdimm_set_label_size, NULL, 94 NULL, NULL); 95 object_property_add_bool(obj, NVDIMM_UNARMED_PROP, 96 nvdimm_get_unarmed, nvdimm_set_unarmed, NULL); 97 } 98 99 static MemoryRegion *nvdimm_get_memory_region(PCDIMMDevice *dimm, Error **errp) 100 { 101 NVDIMMDevice *nvdimm = NVDIMM(dimm); 102 103 return &nvdimm->nvdimm_mr; 104 } 105 106 static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp) 107 { 108 MemoryRegion *mr = host_memory_backend_get_memory(dimm->hostmem, errp); 109 NVDIMMDevice *nvdimm = NVDIMM(dimm); 110 uint64_t align, pmem_size, size = memory_region_size(mr); 111 112 align = memory_region_get_alignment(mr); 113 114 pmem_size = size - nvdimm->label_size; 115 nvdimm->label_data = memory_region_get_ram_ptr(mr) + pmem_size; 116 pmem_size = QEMU_ALIGN_DOWN(pmem_size, align); 117 118 if (size <= nvdimm->label_size || !pmem_size) { 119 HostMemoryBackend *hostmem = dimm->hostmem; 120 char *path = object_get_canonical_path_component(OBJECT(hostmem)); 121 122 error_setg(errp, "the size of memdev %s (0x%" PRIx64 ") is too " 123 "small to contain nvdimm label (0x%" PRIx64 ") and " 124 "aligned PMEM (0x%" PRIx64 ")", 125 path, memory_region_size(mr), nvdimm->label_size, align); 126 g_free(path); 127 return; 128 } 129 130 memory_region_init_alias(&nvdimm->nvdimm_mr, OBJECT(dimm), 131 "nvdimm-memory", mr, 0, pmem_size); 132 nvdimm->nvdimm_mr.align = align; 133 } 134 135 /* 136 * the caller should check the input parameters before calling 137 * label read/write functions. 138 */ 139 static void nvdimm_validate_rw_label_data(NVDIMMDevice *nvdimm, uint64_t size, 140 uint64_t offset) 141 { 142 assert((nvdimm->label_size >= size + offset) && (offset + size > offset)); 143 } 144 145 static void nvdimm_read_label_data(NVDIMMDevice *nvdimm, void *buf, 146 uint64_t size, uint64_t offset) 147 { 148 nvdimm_validate_rw_label_data(nvdimm, size, offset); 149 150 memcpy(buf, nvdimm->label_data + offset, size); 151 } 152 153 static void nvdimm_write_label_data(NVDIMMDevice *nvdimm, const void *buf, 154 uint64_t size, uint64_t offset) 155 { 156 MemoryRegion *mr; 157 PCDIMMDevice *dimm = PC_DIMM(nvdimm); 158 uint64_t backend_offset; 159 160 nvdimm_validate_rw_label_data(nvdimm, size, offset); 161 162 memcpy(nvdimm->label_data + offset, buf, size); 163 164 mr = host_memory_backend_get_memory(dimm->hostmem, &error_abort); 165 backend_offset = memory_region_size(mr) - nvdimm->label_size + offset; 166 memory_region_set_dirty(mr, backend_offset, size); 167 } 168 169 static MemoryRegion *nvdimm_get_vmstate_memory_region(PCDIMMDevice *dimm) 170 { 171 return host_memory_backend_get_memory(dimm->hostmem, &error_abort); 172 } 173 174 static void nvdimm_class_init(ObjectClass *oc, void *data) 175 { 176 PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc); 177 NVDIMMClass *nvc = NVDIMM_CLASS(oc); 178 179 ddc->realize = nvdimm_realize; 180 ddc->get_memory_region = nvdimm_get_memory_region; 181 ddc->get_vmstate_memory_region = nvdimm_get_vmstate_memory_region; 182 183 nvc->read_label_data = nvdimm_read_label_data; 184 nvc->write_label_data = nvdimm_write_label_data; 185 } 186 187 static TypeInfo nvdimm_info = { 188 .name = TYPE_NVDIMM, 189 .parent = TYPE_PC_DIMM, 190 .class_size = sizeof(NVDIMMClass), 191 .class_init = nvdimm_class_init, 192 .instance_size = sizeof(NVDIMMDevice), 193 .instance_init = nvdimm_init, 194 }; 195 196 static void nvdimm_register_types(void) 197 { 198 type_register_static(&nvdimm_info); 199 } 200 201 type_init(nvdimm_register_types) 202