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 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/mem/pc-dimm.h" 23 #include "hw/mem/nvdimm.h" 24 #include "hw/mem/memory-device.h" 25 #include "qapi/error.h" 26 #include "qapi/visitor.h" 27 #include "sysemu/numa.h" 28 #include "trace.h" 29 30 static int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp); 31 32 void pc_dimm_plug(DeviceState *dev, MachineState *machine, uint64_t align, 33 Error **errp) 34 { 35 int slot; 36 PCDIMMDevice *dimm = PC_DIMM(dev); 37 PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm); 38 MemoryRegion *vmstate_mr = ddc->get_vmstate_memory_region(dimm, 39 &error_abort); 40 MemoryRegion *mr = ddc->get_memory_region(dimm, &error_abort); 41 Error *local_err = NULL; 42 uint64_t addr; 43 44 addr = object_property_get_uint(OBJECT(dimm), 45 PC_DIMM_ADDR_PROP, &local_err); 46 if (local_err) { 47 goto out; 48 } 49 50 addr = memory_device_get_free_addr(machine, !addr ? NULL : &addr, align, 51 memory_region_size(mr), &local_err); 52 if (local_err) { 53 goto out; 54 } 55 56 object_property_set_uint(OBJECT(dev), addr, PC_DIMM_ADDR_PROP, &local_err); 57 if (local_err) { 58 goto out; 59 } 60 trace_mhp_pc_dimm_assigned_address(addr); 61 62 slot = object_property_get_int(OBJECT(dev), PC_DIMM_SLOT_PROP, &local_err); 63 if (local_err) { 64 goto out; 65 } 66 67 slot = pc_dimm_get_free_slot(slot == PC_DIMM_UNASSIGNED_SLOT ? NULL : &slot, 68 machine->ram_slots, &local_err); 69 if (local_err) { 70 goto out; 71 } 72 object_property_set_int(OBJECT(dev), slot, PC_DIMM_SLOT_PROP, &local_err); 73 if (local_err) { 74 goto out; 75 } 76 trace_mhp_pc_dimm_assigned_slot(slot); 77 78 memory_device_plug_region(machine, mr, addr); 79 vmstate_register_ram(vmstate_mr, dev); 80 81 out: 82 error_propagate(errp, local_err); 83 } 84 85 void pc_dimm_unplug(DeviceState *dev, MachineState *machine) 86 { 87 PCDIMMDevice *dimm = PC_DIMM(dev); 88 PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm); 89 MemoryRegion *vmstate_mr = ddc->get_vmstate_memory_region(dimm, 90 &error_abort); 91 MemoryRegion *mr = ddc->get_memory_region(dimm, &error_abort); 92 93 memory_device_unplug_region(machine, mr); 94 vmstate_unregister_ram(vmstate_mr, dev); 95 } 96 97 static int pc_dimm_slot2bitmap(Object *obj, void *opaque) 98 { 99 unsigned long *bitmap = opaque; 100 101 if (object_dynamic_cast(obj, TYPE_PC_DIMM)) { 102 DeviceState *dev = DEVICE(obj); 103 if (dev->realized) { /* count only realized DIMMs */ 104 PCDIMMDevice *d = PC_DIMM(obj); 105 set_bit(d->slot, bitmap); 106 } 107 } 108 109 object_child_foreach(obj, pc_dimm_slot2bitmap, opaque); 110 return 0; 111 } 112 113 static int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp) 114 { 115 unsigned long *bitmap; 116 int slot = 0; 117 118 if (max_slots <= 0) { 119 error_setg(errp, "no slots where allocated, please specify " 120 "the 'slots' option"); 121 return slot; 122 } 123 124 bitmap = bitmap_new(max_slots); 125 object_child_foreach(qdev_get_machine(), pc_dimm_slot2bitmap, bitmap); 126 127 /* check if requested slot is not occupied */ 128 if (hint) { 129 if (*hint >= max_slots) { 130 error_setg(errp, "invalid slot# %d, should be less than %d", 131 *hint, max_slots); 132 } else if (!test_bit(*hint, bitmap)) { 133 slot = *hint; 134 } else { 135 error_setg(errp, "slot %d is busy", *hint); 136 } 137 goto out; 138 } 139 140 /* search for free slot */ 141 slot = find_first_zero_bit(bitmap, max_slots); 142 if (slot == max_slots) { 143 error_setg(errp, "no free slots available"); 144 } 145 out: 146 g_free(bitmap); 147 return slot; 148 } 149 150 static Property pc_dimm_properties[] = { 151 DEFINE_PROP_UINT64(PC_DIMM_ADDR_PROP, PCDIMMDevice, addr, 0), 152 DEFINE_PROP_UINT32(PC_DIMM_NODE_PROP, PCDIMMDevice, node, 0), 153 DEFINE_PROP_INT32(PC_DIMM_SLOT_PROP, PCDIMMDevice, slot, 154 PC_DIMM_UNASSIGNED_SLOT), 155 DEFINE_PROP_LINK(PC_DIMM_MEMDEV_PROP, PCDIMMDevice, hostmem, 156 TYPE_MEMORY_BACKEND, HostMemoryBackend *), 157 DEFINE_PROP_END_OF_LIST(), 158 }; 159 160 static void pc_dimm_get_size(Object *obj, Visitor *v, const char *name, 161 void *opaque, Error **errp) 162 { 163 uint64_t value; 164 MemoryRegion *mr; 165 PCDIMMDevice *dimm = PC_DIMM(obj); 166 PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(obj); 167 168 mr = ddc->get_memory_region(dimm, errp); 169 if (!mr) { 170 return; 171 } 172 value = memory_region_size(mr); 173 174 visit_type_uint64(v, name, &value, errp); 175 } 176 177 static void pc_dimm_init(Object *obj) 178 { 179 object_property_add(obj, PC_DIMM_SIZE_PROP, "uint64", pc_dimm_get_size, 180 NULL, NULL, NULL, &error_abort); 181 } 182 183 static void pc_dimm_realize(DeviceState *dev, Error **errp) 184 { 185 PCDIMMDevice *dimm = PC_DIMM(dev); 186 PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm); 187 188 if (!dimm->hostmem) { 189 error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property is not set"); 190 return; 191 } else if (host_memory_backend_is_mapped(dimm->hostmem)) { 192 char *path = object_get_canonical_path_component(OBJECT(dimm->hostmem)); 193 error_setg(errp, "can't use already busy memdev: %s", path); 194 g_free(path); 195 return; 196 } 197 if (((nb_numa_nodes > 0) && (dimm->node >= nb_numa_nodes)) || 198 (!nb_numa_nodes && dimm->node)) { 199 error_setg(errp, "'DIMM property " PC_DIMM_NODE_PROP " has value %" 200 PRIu32 "' which exceeds the number of numa nodes: %d", 201 dimm->node, nb_numa_nodes ? nb_numa_nodes : 1); 202 return; 203 } 204 205 if (ddc->realize) { 206 ddc->realize(dimm, errp); 207 } 208 209 host_memory_backend_set_mapped(dimm->hostmem, true); 210 } 211 212 static void pc_dimm_unrealize(DeviceState *dev, Error **errp) 213 { 214 PCDIMMDevice *dimm = PC_DIMM(dev); 215 216 host_memory_backend_set_mapped(dimm->hostmem, false); 217 } 218 219 static MemoryRegion *pc_dimm_get_memory_region(PCDIMMDevice *dimm, Error **errp) 220 { 221 if (!dimm->hostmem) { 222 error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property must be set"); 223 return NULL; 224 } 225 226 return host_memory_backend_get_memory(dimm->hostmem); 227 } 228 229 static uint64_t pc_dimm_md_get_addr(const MemoryDeviceState *md) 230 { 231 const PCDIMMDevice *dimm = PC_DIMM(md); 232 233 return dimm->addr; 234 } 235 236 static uint64_t pc_dimm_md_get_region_size(const MemoryDeviceState *md) 237 { 238 /* dropping const here is fine as we don't touch the memory region */ 239 PCDIMMDevice *dimm = PC_DIMM(md); 240 const PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(md); 241 MemoryRegion *mr; 242 243 mr = ddc->get_memory_region(dimm, &error_abort); 244 if (!mr) { 245 return 0; 246 } 247 248 return memory_region_size(mr); 249 } 250 251 static void pc_dimm_md_fill_device_info(const MemoryDeviceState *md, 252 MemoryDeviceInfo *info) 253 { 254 PCDIMMDeviceInfo *di = g_new0(PCDIMMDeviceInfo, 1); 255 const DeviceClass *dc = DEVICE_GET_CLASS(md); 256 const PCDIMMDevice *dimm = PC_DIMM(md); 257 const DeviceState *dev = DEVICE(md); 258 259 if (dev->id) { 260 di->has_id = true; 261 di->id = g_strdup(dev->id); 262 } 263 di->hotplugged = dev->hotplugged; 264 di->hotpluggable = dc->hotpluggable; 265 di->addr = dimm->addr; 266 di->slot = dimm->slot; 267 di->node = dimm->node; 268 di->size = object_property_get_uint(OBJECT(dimm), PC_DIMM_SIZE_PROP, 269 NULL); 270 di->memdev = object_get_canonical_path(OBJECT(dimm->hostmem)); 271 272 if (object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM)) { 273 info->u.nvdimm.data = di; 274 info->type = MEMORY_DEVICE_INFO_KIND_NVDIMM; 275 } else { 276 info->u.dimm.data = di; 277 info->type = MEMORY_DEVICE_INFO_KIND_DIMM; 278 } 279 } 280 281 static void pc_dimm_class_init(ObjectClass *oc, void *data) 282 { 283 DeviceClass *dc = DEVICE_CLASS(oc); 284 PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc); 285 MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(oc); 286 287 dc->realize = pc_dimm_realize; 288 dc->unrealize = pc_dimm_unrealize; 289 dc->props = pc_dimm_properties; 290 dc->desc = "DIMM memory module"; 291 292 ddc->get_memory_region = pc_dimm_get_memory_region; 293 ddc->get_vmstate_memory_region = pc_dimm_get_memory_region; 294 295 mdc->get_addr = pc_dimm_md_get_addr; 296 /* for a dimm plugged_size == region_size */ 297 mdc->get_plugged_size = pc_dimm_md_get_region_size; 298 mdc->get_region_size = pc_dimm_md_get_region_size; 299 mdc->fill_device_info = pc_dimm_md_fill_device_info; 300 } 301 302 static TypeInfo pc_dimm_info = { 303 .name = TYPE_PC_DIMM, 304 .parent = TYPE_DEVICE, 305 .instance_size = sizeof(PCDIMMDevice), 306 .instance_init = pc_dimm_init, 307 .class_init = pc_dimm_class_init, 308 .class_size = sizeof(PCDIMMDeviceClass), 309 .interfaces = (InterfaceInfo[]) { 310 { TYPE_MEMORY_DEVICE }, 311 { } 312 }, 313 }; 314 315 static void pc_dimm_register_types(void) 316 { 317 type_register_static(&pc_dimm_info); 318 } 319 320 type_init(pc_dimm_register_types) 321