1 /* 2 * Dimm device for Memory Hotplug 3 * 4 * Copyright ProfitBricks GmbH 2012 5 * Copyright (C) 2014 Red Hat Inc 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with this library; if not, see <http://www.gnu.org/licenses/> 19 */ 20 21 #include "qemu/osdep.h" 22 #include "hw/boards.h" 23 #include "hw/mem/pc-dimm.h" 24 #include "hw/qdev-properties.h" 25 #include "migration/vmstate.h" 26 #include "hw/mem/nvdimm.h" 27 #include "hw/mem/memory-device.h" 28 #include "qapi/error.h" 29 #include "qapi/visitor.h" 30 #include "qemu/module.h" 31 #include "sysemu/hostmem.h" 32 #include "sysemu/numa.h" 33 #include "trace.h" 34 35 static int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp); 36 37 static MemoryRegion *pc_dimm_get_memory_region(PCDIMMDevice *dimm, Error **errp) 38 { 39 if (!dimm->hostmem) { 40 error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property must be set"); 41 return NULL; 42 } 43 44 return host_memory_backend_get_memory(dimm->hostmem); 45 } 46 47 void pc_dimm_pre_plug(PCDIMMDevice *dimm, MachineState *machine, 48 const uint64_t *legacy_align, Error **errp) 49 { 50 Error *local_err = NULL; 51 int slot; 52 53 slot = object_property_get_int(OBJECT(dimm), PC_DIMM_SLOT_PROP, 54 &error_abort); 55 if ((slot < 0 || slot >= machine->ram_slots) && 56 slot != PC_DIMM_UNASSIGNED_SLOT) { 57 error_setg(errp, 58 "invalid slot number %d, valid range is [0-%" PRIu64 "]", 59 slot, machine->ram_slots - 1); 60 return; 61 } 62 63 slot = pc_dimm_get_free_slot(slot == PC_DIMM_UNASSIGNED_SLOT ? NULL : &slot, 64 machine->ram_slots, &local_err); 65 if (local_err) { 66 error_propagate(errp, local_err); 67 return; 68 } 69 object_property_set_int(OBJECT(dimm), PC_DIMM_SLOT_PROP, slot, 70 &error_abort); 71 trace_mhp_pc_dimm_assigned_slot(slot); 72 73 memory_device_pre_plug(MEMORY_DEVICE(dimm), machine, legacy_align, 74 errp); 75 } 76 77 void pc_dimm_plug(PCDIMMDevice *dimm, MachineState *machine) 78 { 79 MemoryRegion *vmstate_mr = pc_dimm_get_memory_region(dimm, 80 &error_abort); 81 82 memory_device_plug(MEMORY_DEVICE(dimm), machine); 83 vmstate_register_ram(vmstate_mr, DEVICE(dimm)); 84 } 85 86 void pc_dimm_unplug(PCDIMMDevice *dimm, MachineState *machine) 87 { 88 MemoryRegion *vmstate_mr = pc_dimm_get_memory_region(dimm, 89 &error_abort); 90 91 memory_device_unplug(MEMORY_DEVICE(dimm), machine); 92 vmstate_unregister_ram(vmstate_mr, DEVICE(dimm)); 93 } 94 95 static int pc_dimm_slot2bitmap(Object *obj, void *opaque) 96 { 97 unsigned long *bitmap = opaque; 98 99 if (object_dynamic_cast(obj, TYPE_PC_DIMM)) { 100 DeviceState *dev = DEVICE(obj); 101 if (dev->realized) { /* count only realized DIMMs */ 102 PCDIMMDevice *d = PC_DIMM(obj); 103 set_bit(d->slot, bitmap); 104 } 105 } 106 107 object_child_foreach(obj, pc_dimm_slot2bitmap, opaque); 108 return 0; 109 } 110 111 static int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp) 112 { 113 unsigned long *bitmap; 114 int slot = 0; 115 116 if (max_slots <= 0) { 117 error_setg(errp, "no slots where allocated, please specify " 118 "the 'slots' option"); 119 return slot; 120 } 121 122 bitmap = bitmap_new(max_slots); 123 object_child_foreach(qdev_get_machine(), pc_dimm_slot2bitmap, bitmap); 124 125 /* check if requested slot is not occupied */ 126 if (hint) { 127 if (*hint >= max_slots) { 128 error_setg(errp, "invalid slot# %d, should be less than %d", 129 *hint, max_slots); 130 } else if (!test_bit(*hint, bitmap)) { 131 slot = *hint; 132 } else { 133 error_setg(errp, "slot %d is busy", *hint); 134 } 135 goto out; 136 } 137 138 /* search for free slot */ 139 slot = find_first_zero_bit(bitmap, max_slots); 140 if (slot == max_slots) { 141 error_setg(errp, "no free slots available"); 142 } 143 out: 144 g_free(bitmap); 145 return slot; 146 } 147 148 static Property pc_dimm_properties[] = { 149 DEFINE_PROP_UINT64(PC_DIMM_ADDR_PROP, PCDIMMDevice, addr, 0), 150 DEFINE_PROP_UINT32(PC_DIMM_NODE_PROP, PCDIMMDevice, node, 0), 151 DEFINE_PROP_INT32(PC_DIMM_SLOT_PROP, PCDIMMDevice, slot, 152 PC_DIMM_UNASSIGNED_SLOT), 153 DEFINE_PROP_LINK(PC_DIMM_MEMDEV_PROP, PCDIMMDevice, hostmem, 154 TYPE_MEMORY_BACKEND, HostMemoryBackend *), 155 DEFINE_PROP_END_OF_LIST(), 156 }; 157 158 static void pc_dimm_get_size(Object *obj, Visitor *v, const char *name, 159 void *opaque, Error **errp) 160 { 161 Error *local_err = NULL; 162 uint64_t value; 163 164 value = memory_device_get_region_size(MEMORY_DEVICE(obj), &local_err); 165 if (local_err) { 166 error_propagate(errp, local_err); 167 return; 168 } 169 170 visit_type_uint64(v, name, &value, errp); 171 } 172 173 static void pc_dimm_init(Object *obj) 174 { 175 object_property_add(obj, PC_DIMM_SIZE_PROP, "uint64", pc_dimm_get_size, 176 NULL, NULL, NULL); 177 } 178 179 static void pc_dimm_realize(DeviceState *dev, Error **errp) 180 { 181 PCDIMMDevice *dimm = PC_DIMM(dev); 182 PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm); 183 MachineState *ms = MACHINE(qdev_get_machine()); 184 185 if (ms->numa_state) { 186 int nb_numa_nodes = ms->numa_state->num_nodes; 187 188 if (((nb_numa_nodes > 0) && (dimm->node >= nb_numa_nodes)) || 189 (!nb_numa_nodes && dimm->node)) { 190 error_setg(errp, "'DIMM property " PC_DIMM_NODE_PROP " has value %" 191 PRIu32 "' which exceeds the number of numa nodes: %d", 192 dimm->node, nb_numa_nodes ? nb_numa_nodes : 1); 193 return; 194 } 195 } else if (dimm->node > 0) { 196 error_setg(errp, "machine doesn't support NUMA"); 197 return; 198 } 199 200 if (!dimm->hostmem) { 201 error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property is not set"); 202 return; 203 } else if (host_memory_backend_is_mapped(dimm->hostmem)) { 204 error_setg(errp, "can't use already busy memdev: %s", 205 object_get_canonical_path_component(OBJECT(dimm->hostmem))); 206 return; 207 } 208 209 if (ddc->realize) { 210 ddc->realize(dimm, errp); 211 } 212 213 host_memory_backend_set_mapped(dimm->hostmem, true); 214 } 215 216 static void pc_dimm_unrealize(DeviceState *dev) 217 { 218 PCDIMMDevice *dimm = PC_DIMM(dev); 219 PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm); 220 221 if (ddc->unrealize) { 222 ddc->unrealize(dimm); 223 } 224 225 host_memory_backend_set_mapped(dimm->hostmem, false); 226 } 227 228 static uint64_t pc_dimm_md_get_addr(const MemoryDeviceState *md) 229 { 230 return object_property_get_uint(OBJECT(md), PC_DIMM_ADDR_PROP, 231 &error_abort); 232 } 233 234 static void pc_dimm_md_set_addr(MemoryDeviceState *md, uint64_t addr, 235 Error **errp) 236 { 237 object_property_set_uint(OBJECT(md), PC_DIMM_ADDR_PROP, addr, errp); 238 } 239 240 static MemoryRegion *pc_dimm_md_get_memory_region(MemoryDeviceState *md, 241 Error **errp) 242 { 243 return pc_dimm_get_memory_region(PC_DIMM(md), errp); 244 } 245 246 static void pc_dimm_md_fill_device_info(const MemoryDeviceState *md, 247 MemoryDeviceInfo *info) 248 { 249 PCDIMMDeviceInfo *di = g_new0(PCDIMMDeviceInfo, 1); 250 const DeviceClass *dc = DEVICE_GET_CLASS(md); 251 const PCDIMMDevice *dimm = PC_DIMM(md); 252 const DeviceState *dev = DEVICE(md); 253 254 if (dev->id) { 255 di->id = g_strdup(dev->id); 256 } 257 di->hotplugged = dev->hotplugged; 258 di->hotpluggable = dc->hotpluggable; 259 di->addr = dimm->addr; 260 di->slot = dimm->slot; 261 di->node = dimm->node; 262 di->size = object_property_get_uint(OBJECT(dimm), PC_DIMM_SIZE_PROP, 263 NULL); 264 di->memdev = object_get_canonical_path(OBJECT(dimm->hostmem)); 265 266 if (object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM)) { 267 info->u.nvdimm.data = di; 268 info->type = MEMORY_DEVICE_INFO_KIND_NVDIMM; 269 } else { 270 info->u.dimm.data = di; 271 info->type = MEMORY_DEVICE_INFO_KIND_DIMM; 272 } 273 } 274 275 static void pc_dimm_class_init(ObjectClass *oc, void *data) 276 { 277 DeviceClass *dc = DEVICE_CLASS(oc); 278 MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(oc); 279 280 dc->realize = pc_dimm_realize; 281 dc->unrealize = pc_dimm_unrealize; 282 device_class_set_props(dc, pc_dimm_properties); 283 dc->desc = "DIMM memory module"; 284 285 mdc->get_addr = pc_dimm_md_get_addr; 286 mdc->set_addr = pc_dimm_md_set_addr; 287 /* for a dimm plugged_size == region_size */ 288 mdc->get_plugged_size = memory_device_get_region_size; 289 mdc->get_memory_region = pc_dimm_md_get_memory_region; 290 mdc->fill_device_info = pc_dimm_md_fill_device_info; 291 } 292 293 static const TypeInfo pc_dimm_info = { 294 .name = TYPE_PC_DIMM, 295 .parent = TYPE_DEVICE, 296 .instance_size = sizeof(PCDIMMDevice), 297 .instance_init = pc_dimm_init, 298 .class_init = pc_dimm_class_init, 299 .class_size = sizeof(PCDIMMDeviceClass), 300 .interfaces = (InterfaceInfo[]) { 301 { TYPE_MEMORY_DEVICE }, 302 { } 303 }, 304 }; 305 306 static void pc_dimm_register_types(void) 307 { 308 type_register_static(&pc_dimm_info); 309 } 310 311 type_init(pc_dimm_register_types) 312