hw/mem/pc-dimm.c

   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 "qemu/config-file.h"
  24 #include "qapi/visitor.h"
  25 #include "qemu/range.h"
  26 #include "sysemu/numa.h"
  27 #include "sysemu/kvm.h"
  28 #include "trace.h"
  29 #include "hw/virtio/vhost.h"
  30
  31 typedef struct pc_dimms_capacity {
  32      uint64_t size;
  33      Error    **errp;
  34 } pc_dimms_capacity;
  35
  36 void pc_dimm_memory_plug(DeviceState *dev, MemoryHotplugState *hpms,
  37                          MemoryRegion *mr, uint64_t align, Error **errp)
  38 {
  39     int slot;
  40     MachineState *machine = MACHINE(qdev_get_machine());
  41     PCDIMMDevice *dimm = PC_DIMM(dev);
  42     Error *local_err = NULL;
  43     uint64_t existing_dimms_capacity = 0;
  44     uint64_t addr;
  45
  46     addr = object_property_get_int(OBJECT(dimm), PC_DIMM_ADDR_PROP, &local_err);
  47     if (local_err) {
  48         goto out;
  49     }
  50
  51     addr = pc_dimm_get_free_addr(hpms->base,
  52                                  memory_region_size(&hpms->mr),
  53                                  !addr ? NULL : &addr, align,
  54                                  memory_region_size(mr), &local_err);
  55     if (local_err) {
  56         goto out;
  57     }
  58
  59     existing_dimms_capacity = pc_existing_dimms_capacity(&local_err);
  60     if (local_err) {
  61         goto out;
  62     }
  63
  64     if (existing_dimms_capacity + memory_region_size(mr) >
  65         machine->maxram_size - machine->ram_size) {
  66         error_setg(&local_err, "not enough space, currently 0x%" PRIx64
  67                    " in use of total hot pluggable 0x" RAM_ADDR_FMT,
  68                    existing_dimms_capacity,
  69                    machine->maxram_size - machine->ram_size);
  70         goto out;
  71     }
  72
  73     object_property_set_int(OBJECT(dev), addr, PC_DIMM_ADDR_PROP, &local_err);
  74     if (local_err) {
  75         goto out;
  76     }
  77     trace_mhp_pc_dimm_assigned_address(addr);
  78
  79     slot = object_property_get_int(OBJECT(dev), PC_DIMM_SLOT_PROP, &local_err);
  80     if (local_err) {
  81         goto out;
  82     }
  83
  84     slot = pc_dimm_get_free_slot(slot == PC_DIMM_UNASSIGNED_SLOT ? NULL : &slot,
  85                                  machine->ram_slots, &local_err);
  86     if (local_err) {
  87         goto out;
  88     }
  89     object_property_set_int(OBJECT(dev), slot, PC_DIMM_SLOT_PROP, &local_err);
  90     if (local_err) {
  91         goto out;
  92     }
  93     trace_mhp_pc_dimm_assigned_slot(slot);
  94
  95     if (kvm_enabled() && !kvm_has_free_slot(machine)) {
  96         error_setg(&local_err, "hypervisor has no free memory slots left");
  97         goto out;
  98     }
  99
 100     if (!vhost_has_free_slot()) {
 101         error_setg(&local_err, "a used vhost backend has no free"
 102                                " memory slots left");
 103         goto out;
 104     }
 105
 106     memory_region_add_subregion(&hpms->mr, addr - hpms->base, mr);
 107     vmstate_register_ram(mr, dev);
 108     numa_set_mem_node_id(addr, memory_region_size(mr), dimm->node);
 109
 110 out:
 111     error_propagate(errp, local_err);
 112 }
 113
 114 void pc_dimm_memory_unplug(DeviceState *dev, MemoryHotplugState *hpms,
 115                            MemoryRegion *mr)
 116 {
 117     PCDIMMDevice *dimm = PC_DIMM(dev);
 118
 119     numa_unset_mem_node_id(dimm->addr, memory_region_size(mr), dimm->node);
 120     memory_region_del_subregion(&hpms->mr, mr);
 121     vmstate_unregister_ram(mr, dev);
 122 }
 123
 124 static int pc_existing_dimms_capacity_internal(Object *obj, void *opaque)
 125 {
 126     pc_dimms_capacity *cap = opaque;
 127     uint64_t *size = &cap->size;
 128
 129     if (object_dynamic_cast(obj, TYPE_PC_DIMM)) {
 130         DeviceState *dev = DEVICE(obj);
 131
 132         if (dev->realized) {
 133             (*size) += object_property_get_int(obj, PC_DIMM_SIZE_PROP,
 134                 cap->errp);
 135         }
 136
 137         if (cap->errp && *cap->errp) {
 138             return 1;
 139         }
 140     }
 141     object_child_foreach(obj, pc_existing_dimms_capacity_internal, opaque);
 142     return 0;
 143 }
 144
 145 uint64_t pc_existing_dimms_capacity(Error **errp)
 146 {
 147     pc_dimms_capacity cap;
 148
 149     cap.size = 0;
 150     cap.errp = errp;
 151
 152     pc_existing_dimms_capacity_internal(qdev_get_machine(), &cap);
 153     return cap.size;
 154 }
 155
 156 int qmp_pc_dimm_device_list(Object *obj, void *opaque)
 157 {
 158     MemoryDeviceInfoList ***prev = opaque;
 159
 160     if (object_dynamic_cast(obj, TYPE_PC_DIMM)) {
 161         DeviceState *dev = DEVICE(obj);
 162
 163         if (dev->realized) {
 164             MemoryDeviceInfoList *elem = g_new0(MemoryDeviceInfoList, 1);
 165             MemoryDeviceInfo *info = g_new0(MemoryDeviceInfo, 1);
 166             PCDIMMDeviceInfo *di = g_new0(PCDIMMDeviceInfo, 1);
 167             DeviceClass *dc = DEVICE_GET_CLASS(obj);
 168             PCDIMMDevice *dimm = PC_DIMM(obj);
 169
 170             if (dev->id) {
 171                 di->has_id = true;
 172                 di->id = g_strdup(dev->id);
 173             }
 174             di->hotplugged = dev->hotplugged;
 175             di->hotpluggable = dc->hotpluggable;
 176             di->addr = dimm->addr;
 177             di->slot = dimm->slot;
 178             di->node = dimm->node;
 179             di->size = object_property_get_int(OBJECT(dimm), PC_DIMM_SIZE_PROP,
 180                                                NULL);
 181             di->memdev = object_get_canonical_path(OBJECT(dimm->hostmem));
 182
 183             info->u.dimm = di;
 184             elem->value = info;
 185             elem->next = NULL;
 186             **prev = elem;
 187             *prev = &elem->next;
 188         }
 189     }
 190
 191     object_child_foreach(obj, qmp_pc_dimm_device_list, opaque);
 192     return 0;
 193 }
 194
 195 ram_addr_t get_current_ram_size(void)
 196 {
 197     MemoryDeviceInfoList *info_list = NULL;
 198     MemoryDeviceInfoList **prev = &info_list;
 199     MemoryDeviceInfoList *info;
 200     ram_addr_t size = ram_size;
 201
 202     qmp_pc_dimm_device_list(qdev_get_machine(), &prev);
 203     for (info = info_list; info; info = info->next) {
 204         MemoryDeviceInfo *value = info->value;
 205
 206         if (value) {
 207             switch (value->type) {
 208             case MEMORY_DEVICE_INFO_KIND_DIMM:
 209                 size += value->u.dimm->size;
 210                 break;
 211             default:
 212                 break;
 213             }
 214         }
 215     }
 216     qapi_free_MemoryDeviceInfoList(info_list);
 217
 218     return size;
 219 }
 220
 221 static int pc_dimm_slot2bitmap(Object *obj, void *opaque)
 222 {
 223     unsigned long *bitmap = opaque;
 224
 225     if (object_dynamic_cast(obj, TYPE_PC_DIMM)) {
 226         DeviceState *dev = DEVICE(obj);
 227         if (dev->realized) { /* count only realized DIMMs */
 228             PCDIMMDevice *d = PC_DIMM(obj);
 229             set_bit(d->slot, bitmap);
 230         }
 231     }
 232
 233     object_child_foreach(obj, pc_dimm_slot2bitmap, opaque);
 234     return 0;
 235 }
 236
 237 int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp)
 238 {
 239     unsigned long *bitmap = bitmap_new(max_slots);
 240     int slot = 0;
 241
 242     object_child_foreach(qdev_get_machine(), pc_dimm_slot2bitmap, bitmap);
 243
 244     /* check if requested slot is not occupied */
 245     if (hint) {
 246         if (*hint >= max_slots) {
 247             error_setg(errp, "invalid slot# %d, should be less than %d",
 248                        *hint, max_slots);
 249         } else if (!test_bit(*hint, bitmap)) {
 250             slot = *hint;
 251         } else {
 252             error_setg(errp, "slot %d is busy", *hint);
 253         }
 254         goto out;
 255     }
 256
 257     /* search for free slot */
 258     slot = find_first_zero_bit(bitmap, max_slots);
 259     if (slot == max_slots) {
 260         error_setg(errp, "no free slots available");
 261     }
 262 out:
 263     g_free(bitmap);
 264     return slot;
 265 }
 266
 267 static gint pc_dimm_addr_sort(gconstpointer a, gconstpointer b)
 268 {
 269     PCDIMMDevice *x = PC_DIMM(a);
 270     PCDIMMDevice *y = PC_DIMM(b);
 271     Int128 diff = int128_sub(int128_make64(x->addr), int128_make64(y->addr));
 272
 273     if (int128_lt(diff, int128_zero())) {
 274         return -1;
 275     } else if (int128_gt(diff, int128_zero())) {
 276         return 1;
 277     }
 278     return 0;
 279 }
 280
 281 static int pc_dimm_built_list(Object *obj, void *opaque)
 282 {
 283     GSList **list = opaque;
 284
 285     if (object_dynamic_cast(obj, TYPE_PC_DIMM)) {
 286         DeviceState *dev = DEVICE(obj);
 287         if (dev->realized) { /* only realized DIMMs matter */
 288             *list = g_slist_insert_sorted(*list, dev, pc_dimm_addr_sort);
 289         }
 290     }
 291
 292     object_child_foreach(obj, pc_dimm_built_list, opaque);
 293     return 0;
 294 }
 295
 296 uint64_t pc_dimm_get_free_addr(uint64_t address_space_start,
 297                                uint64_t address_space_size,
 298                                uint64_t *hint, uint64_t align, uint64_t size,
 299                                Error **errp)
 300 {
 301     GSList *list = NULL, *item;
 302     uint64_t new_addr, ret = 0;
 303     uint64_t address_space_end = address_space_start + address_space_size;
 304
 305     g_assert(QEMU_ALIGN_UP(address_space_start, align) == address_space_start);
 306
 307     if (!address_space_size) {
 308         error_setg(errp, "memory hotplug is not enabled, "
 309                          "please add maxmem option");
 310         goto out;
 311     }
 312
 313     if (hint && QEMU_ALIGN_UP(*hint, align) != *hint) {
 314         error_setg(errp, "address must be aligned to 0x%" PRIx64 " bytes",
 315                    align);
 316         goto out;
 317     }
 318
 319     if (QEMU_ALIGN_UP(size, align) != size) {
 320         error_setg(errp, "backend memory size must be multiple of 0x%"
 321                    PRIx64, align);
 322         goto out;
 323     }
 324
 325     assert(address_space_end > address_space_start);
 326     object_child_foreach(qdev_get_machine(), pc_dimm_built_list, &list);
 327
 328     if (hint) {
 329         new_addr = *hint;
 330     } else {
 331         new_addr = address_space_start;
 332     }
 333
 334     /* find address range that will fit new DIMM */
 335     for (item = list; item; item = g_slist_next(item)) {
 336         PCDIMMDevice *dimm = item->data;
 337         uint64_t dimm_size = object_property_get_int(OBJECT(dimm),
 338                                                      PC_DIMM_SIZE_PROP,
 339                                                      errp);
 340         if (errp && *errp) {
 341             goto out;
 342         }
 343
 344         if (ranges_overlap(dimm->addr, dimm_size, new_addr, size)) {
 345             if (hint) {
 346                 DeviceState *d = DEVICE(dimm);
 347                 error_setg(errp, "address range conflicts with '%s'", d->id);
 348                 goto out;
 349             }
 350             new_addr = QEMU_ALIGN_UP(dimm->addr + dimm_size, align);
 351         }
 352     }
 353     ret = new_addr;
 354
 355     if (new_addr < address_space_start) {
 356         error_setg(errp, "can't add memory [0x%" PRIx64 ":0x%" PRIx64
 357                    "] at 0x%" PRIx64, new_addr, size, address_space_start);
 358     } else if ((new_addr + size) > address_space_end) {
 359         error_setg(errp, "can't add memory [0x%" PRIx64 ":0x%" PRIx64
 360                    "] beyond 0x%" PRIx64, new_addr, size, address_space_end);
 361     }
 362
 363 out:
 364     g_slist_free(list);
 365     return ret;
 366 }
 367
 368 static Property pc_dimm_properties[] = {
 369     DEFINE_PROP_UINT64(PC_DIMM_ADDR_PROP, PCDIMMDevice, addr, 0),
 370     DEFINE_PROP_UINT32(PC_DIMM_NODE_PROP, PCDIMMDevice, node, 0),
 371     DEFINE_PROP_INT32(PC_DIMM_SLOT_PROP, PCDIMMDevice, slot,
 372                       PC_DIMM_UNASSIGNED_SLOT),
 373     DEFINE_PROP_END_OF_LIST(),
 374 };
 375
 376 static void pc_dimm_get_size(Object *obj, Visitor *v, void *opaque,
 377                           const char *name, Error **errp)
 378 {
 379     int64_t value;
 380     MemoryRegion *mr;
 381     PCDIMMDevice *dimm = PC_DIMM(obj);
 382
 383     mr = host_memory_backend_get_memory(dimm->hostmem, errp);
 384     value = memory_region_size(mr);
 385
 386     visit_type_int(v, name, &value, errp);
 387 }
 388
 389 static void pc_dimm_check_memdev_is_busy(Object *obj, const char *name,
 390                                       Object *val, Error **errp)
 391 {
 392     MemoryRegion *mr;
 393
 394     mr = host_memory_backend_get_memory(MEMORY_BACKEND(val), errp);
 395     if (memory_region_is_mapped(mr)) {
 396         char *path = object_get_canonical_path_component(val);
 397         error_setg(errp, "can't use already busy memdev: %s", path);
 398         g_free(path);
 399     } else {
 400         qdev_prop_allow_set_link_before_realize(obj, name, val, errp);
 401     }
 402 }
 403
 404 static void pc_dimm_init(Object *obj)
 405 {
 406     PCDIMMDevice *dimm = PC_DIMM(obj);
 407
 408     object_property_add(obj, PC_DIMM_SIZE_PROP, "int", pc_dimm_get_size,
 409                         NULL, NULL, NULL, &error_abort);
 410     object_property_add_link(obj, PC_DIMM_MEMDEV_PROP, TYPE_MEMORY_BACKEND,
 411                              (Object **)&dimm->hostmem,
 412                              pc_dimm_check_memdev_is_busy,
 413                              OBJ_PROP_LINK_UNREF_ON_RELEASE,
 414                              &error_abort);
 415 }
 416
 417 static void pc_dimm_realize(DeviceState *dev, Error **errp)
 418 {
 419     PCDIMMDevice *dimm = PC_DIMM(dev);
 420
 421     if (!dimm->hostmem) {
 422         error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property is not set");
 423         return;
 424     }
 425     if (((nb_numa_nodes > 0) && (dimm->node >= nb_numa_nodes)) ||
 426         (!nb_numa_nodes && dimm->node)) {
 427         error_setg(errp, "'DIMM property " PC_DIMM_NODE_PROP " has value %"
 428                    PRIu32 "' which exceeds the number of numa nodes: %d",
 429                    dimm->node, nb_numa_nodes ? nb_numa_nodes : 1);
 430         return;
 431     }
 432 }
 433
 434 static MemoryRegion *pc_dimm_get_memory_region(PCDIMMDevice *dimm)
 435 {
 436     return host_memory_backend_get_memory(dimm->hostmem, &error_abort);
 437 }
 438
 439 static void pc_dimm_class_init(ObjectClass *oc, void *data)
 440 {
 441     DeviceClass *dc = DEVICE_CLASS(oc);
 442     PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc);
 443
 444     dc->realize = pc_dimm_realize;
 445     dc->props = pc_dimm_properties;
 446     dc->desc = "DIMM memory module";
 447
 448     ddc->get_memory_region = pc_dimm_get_memory_region;
 449 }
 450
 451 static TypeInfo pc_dimm_info = {
 452     .name          = TYPE_PC_DIMM,
 453     .parent        = TYPE_DEVICE,
 454     .instance_size = sizeof(PCDIMMDevice),
 455     .instance_init = pc_dimm_init,
 456     .class_init    = pc_dimm_class_init,
 457     .class_size    = sizeof(PCDIMMDeviceClass),
 458 };
 459
 460 static void pc_dimm_register_types(void)
 461 {
 462     type_register_static(&pc_dimm_info);
 463 }
 464
 465 type_init(pc_dimm_register_types)