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