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 typedef struct pc_dimms_capacity { 31 uint64_t size; 32 Error **errp; 33 } pc_dimms_capacity; 34 35 void pc_dimm_memory_plug(DeviceState *dev, MachineState *machine, 36 uint64_t align, Error **errp) 37 { 38 int slot; 39 PCDIMMDevice *dimm = PC_DIMM(dev); 40 PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm); 41 MemoryRegion *vmstate_mr = ddc->get_vmstate_memory_region(dimm); 42 Error *local_err = NULL; 43 MemoryRegion *mr; 44 uint64_t addr; 45 46 mr = ddc->get_memory_region(dimm, &local_err); 47 if (local_err) { 48 goto out; 49 } 50 51 addr = object_property_get_uint(OBJECT(dimm), 52 PC_DIMM_ADDR_PROP, &local_err); 53 if (local_err) { 54 goto out; 55 } 56 57 addr = memory_device_get_free_addr(machine, !addr ? NULL : &addr, align, 58 memory_region_size(mr), &local_err); 59 if (local_err) { 60 goto out; 61 } 62 63 object_property_set_uint(OBJECT(dev), addr, PC_DIMM_ADDR_PROP, &local_err); 64 if (local_err) { 65 goto out; 66 } 67 trace_mhp_pc_dimm_assigned_address(addr); 68 69 slot = object_property_get_int(OBJECT(dev), PC_DIMM_SLOT_PROP, &local_err); 70 if (local_err) { 71 goto out; 72 } 73 74 slot = pc_dimm_get_free_slot(slot == PC_DIMM_UNASSIGNED_SLOT ? NULL : &slot, 75 machine->ram_slots, &local_err); 76 if (local_err) { 77 goto out; 78 } 79 object_property_set_int(OBJECT(dev), slot, PC_DIMM_SLOT_PROP, &local_err); 80 if (local_err) { 81 goto out; 82 } 83 trace_mhp_pc_dimm_assigned_slot(slot); 84 85 memory_device_plug_region(machine, mr, addr); 86 vmstate_register_ram(vmstate_mr, dev); 87 88 out: 89 error_propagate(errp, local_err); 90 } 91 92 void pc_dimm_memory_unplug(DeviceState *dev, MachineState *machine) 93 { 94 PCDIMMDevice *dimm = PC_DIMM(dev); 95 PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm); 96 MemoryRegion *vmstate_mr = ddc->get_vmstate_memory_region(dimm); 97 MemoryRegion *mr = ddc->get_memory_region(dimm, &error_abort); 98 99 memory_device_unplug_region(machine, mr); 100 vmstate_unregister_ram(vmstate_mr, dev); 101 } 102 103 static int pc_dimm_slot2bitmap(Object *obj, void *opaque) 104 { 105 unsigned long *bitmap = opaque; 106 107 if (object_dynamic_cast(obj, TYPE_PC_DIMM)) { 108 DeviceState *dev = DEVICE(obj); 109 if (dev->realized) { /* count only realized DIMMs */ 110 PCDIMMDevice *d = PC_DIMM(obj); 111 set_bit(d->slot, bitmap); 112 } 113 } 114 115 object_child_foreach(obj, pc_dimm_slot2bitmap, opaque); 116 return 0; 117 } 118 119 int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp) 120 { 121 unsigned long *bitmap = bitmap_new(max_slots); 122 int slot = 0; 123 124 object_child_foreach(qdev_get_machine(), pc_dimm_slot2bitmap, bitmap); 125 126 /* check if requested slot is not occupied */ 127 if (hint) { 128 if (*hint >= max_slots) { 129 error_setg(errp, "invalid slot# %d, should be less than %d", 130 *hint, max_slots); 131 } else if (!test_bit(*hint, bitmap)) { 132 slot = *hint; 133 } else { 134 error_setg(errp, "slot %d is busy", *hint); 135 } 136 goto out; 137 } 138 139 /* search for free slot */ 140 slot = find_first_zero_bit(bitmap, max_slots); 141 if (slot == max_slots) { 142 error_setg(errp, "no free slots available"); 143 } 144 out: 145 g_free(bitmap); 146 return slot; 147 } 148 149 static Property pc_dimm_properties[] = { 150 DEFINE_PROP_UINT64(PC_DIMM_ADDR_PROP, PCDIMMDevice, addr, 0), 151 DEFINE_PROP_UINT32(PC_DIMM_NODE_PROP, PCDIMMDevice, node, 0), 152 DEFINE_PROP_INT32(PC_DIMM_SLOT_PROP, PCDIMMDevice, slot, 153 PC_DIMM_UNASSIGNED_SLOT), 154 DEFINE_PROP_LINK(PC_DIMM_MEMDEV_PROP, PCDIMMDevice, hostmem, 155 TYPE_MEMORY_BACKEND, HostMemoryBackend *), 156 DEFINE_PROP_END_OF_LIST(), 157 }; 158 159 static void pc_dimm_get_size(Object *obj, Visitor *v, const char *name, 160 void *opaque, Error **errp) 161 { 162 uint64_t value; 163 MemoryRegion *mr; 164 PCDIMMDevice *dimm = PC_DIMM(obj); 165 PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(obj); 166 167 mr = ddc->get_memory_region(dimm, errp); 168 if (!mr) { 169 return; 170 } 171 value = memory_region_size(mr); 172 173 visit_type_uint64(v, name, &value, errp); 174 } 175 176 static void pc_dimm_init(Object *obj) 177 { 178 object_property_add(obj, PC_DIMM_SIZE_PROP, "uint64", pc_dimm_get_size, 179 NULL, NULL, NULL, &error_abort); 180 } 181 182 static void pc_dimm_realize(DeviceState *dev, Error **errp) 183 { 184 PCDIMMDevice *dimm = PC_DIMM(dev); 185 PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm); 186 187 if (!dimm->hostmem) { 188 error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property is not set"); 189 return; 190 } else if (host_memory_backend_is_mapped(dimm->hostmem)) { 191 char *path = object_get_canonical_path_component(OBJECT(dimm->hostmem)); 192 error_setg(errp, "can't use already busy memdev: %s", path); 193 g_free(path); 194 return; 195 } 196 if (((nb_numa_nodes > 0) && (dimm->node >= nb_numa_nodes)) || 197 (!nb_numa_nodes && dimm->node)) { 198 error_setg(errp, "'DIMM property " PC_DIMM_NODE_PROP " has value %" 199 PRIu32 "' which exceeds the number of numa nodes: %d", 200 dimm->node, nb_numa_nodes ? nb_numa_nodes : 1); 201 return; 202 } 203 204 if (ddc->realize) { 205 ddc->realize(dimm, errp); 206 } 207 208 host_memory_backend_set_mapped(dimm->hostmem, true); 209 } 210 211 static void pc_dimm_unrealize(DeviceState *dev, Error **errp) 212 { 213 PCDIMMDevice *dimm = PC_DIMM(dev); 214 215 host_memory_backend_set_mapped(dimm->hostmem, false); 216 } 217 218 static MemoryRegion *pc_dimm_get_memory_region(PCDIMMDevice *dimm, Error **errp) 219 { 220 if (!dimm->hostmem) { 221 error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property must be set"); 222 return NULL; 223 } 224 225 return host_memory_backend_get_memory(dimm->hostmem, errp); 226 } 227 228 static MemoryRegion *pc_dimm_get_vmstate_memory_region(PCDIMMDevice *dimm) 229 { 230 return host_memory_backend_get_memory(dimm->hostmem, &error_abort); 231 } 232 233 static uint64_t pc_dimm_md_get_addr(const MemoryDeviceState *md) 234 { 235 const PCDIMMDevice *dimm = PC_DIMM(md); 236 237 return dimm->addr; 238 } 239 240 static uint64_t pc_dimm_md_get_region_size(const MemoryDeviceState *md) 241 { 242 /* dropping const here is fine as we don't touch the memory region */ 243 PCDIMMDevice *dimm = PC_DIMM(md); 244 const PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(md); 245 MemoryRegion *mr; 246 247 mr = ddc->get_memory_region(dimm, &error_abort); 248 if (!mr) { 249 return 0; 250 } 251 252 return memory_region_size(mr); 253 } 254 255 static void pc_dimm_md_fill_device_info(const MemoryDeviceState *md, 256 MemoryDeviceInfo *info) 257 { 258 PCDIMMDeviceInfo *di = g_new0(PCDIMMDeviceInfo, 1); 259 const DeviceClass *dc = DEVICE_GET_CLASS(md); 260 const PCDIMMDevice *dimm = PC_DIMM(md); 261 const DeviceState *dev = DEVICE(md); 262 263 if (dev->id) { 264 di->has_id = true; 265 di->id = g_strdup(dev->id); 266 } 267 di->hotplugged = dev->hotplugged; 268 di->hotpluggable = dc->hotpluggable; 269 di->addr = dimm->addr; 270 di->slot = dimm->slot; 271 di->node = dimm->node; 272 di->size = object_property_get_uint(OBJECT(dimm), PC_DIMM_SIZE_PROP, 273 NULL); 274 di->memdev = object_get_canonical_path(OBJECT(dimm->hostmem)); 275 276 if (object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM)) { 277 info->u.nvdimm.data = di; 278 info->type = MEMORY_DEVICE_INFO_KIND_NVDIMM; 279 } else { 280 info->u.dimm.data = di; 281 info->type = MEMORY_DEVICE_INFO_KIND_DIMM; 282 } 283 } 284 285 static void pc_dimm_class_init(ObjectClass *oc, void *data) 286 { 287 DeviceClass *dc = DEVICE_CLASS(oc); 288 PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc); 289 MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(oc); 290 291 dc->realize = pc_dimm_realize; 292 dc->unrealize = pc_dimm_unrealize; 293 dc->props = pc_dimm_properties; 294 dc->desc = "DIMM memory module"; 295 296 ddc->get_memory_region = pc_dimm_get_memory_region; 297 ddc->get_vmstate_memory_region = pc_dimm_get_vmstate_memory_region; 298 299 mdc->get_addr = pc_dimm_md_get_addr; 300 /* for a dimm plugged_size == region_size */ 301 mdc->get_plugged_size = pc_dimm_md_get_region_size; 302 mdc->get_region_size = pc_dimm_md_get_region_size; 303 mdc->fill_device_info = pc_dimm_md_fill_device_info; 304 } 305 306 static TypeInfo pc_dimm_info = { 307 .name = TYPE_PC_DIMM, 308 .parent = TYPE_DEVICE, 309 .instance_size = sizeof(PCDIMMDevice), 310 .instance_init = pc_dimm_init, 311 .class_init = pc_dimm_class_init, 312 .class_size = sizeof(PCDIMMDeviceClass), 313 .interfaces = (InterfaceInfo[]) { 314 { TYPE_MEMORY_DEVICE }, 315 { } 316 }, 317 }; 318 319 static void pc_dimm_register_types(void) 320 { 321 type_register_static(&pc_dimm_info); 322 } 323 324 type_init(pc_dimm_register_types) 325