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 2.1 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     int nb_numa_nodes = ms->numa_state->num_nodes;
 185
 186     if (!dimm->hostmem) {
 187         error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property is not set");
 188         return;
 189     } else if (host_memory_backend_is_mapped(dimm->hostmem)) {
 190         error_setg(errp, "can't use already busy memdev: %s",
 191                    object_get_canonical_path_component(OBJECT(dimm->hostmem)));
 192         return;
 193     }
 194     if (((nb_numa_nodes > 0) && (dimm->node >= nb_numa_nodes)) ||
 195         (!nb_numa_nodes && dimm->node)) {
 196         error_setg(errp, "'DIMM property " PC_DIMM_NODE_PROP " has value %"
 197                    PRIu32 "' which exceeds the number of numa nodes: %d",
 198                    dimm->node, nb_numa_nodes ? nb_numa_nodes : 1);
 199         return;
 200     }
 201
 202     if (ddc->realize) {
 203         ddc->realize(dimm, errp);
 204     }
 205
 206     host_memory_backend_set_mapped(dimm->hostmem, true);
 207 }
 208
 209 static void pc_dimm_unrealize(DeviceState *dev)
 210 {
 211     PCDIMMDevice *dimm = PC_DIMM(dev);
 212
 213     host_memory_backend_set_mapped(dimm->hostmem, false);
 214 }
 215
 216 static uint64_t pc_dimm_md_get_addr(const MemoryDeviceState *md)
 217 {
 218     return object_property_get_uint(OBJECT(md), PC_DIMM_ADDR_PROP,
 219                                     &error_abort);
 220 }
 221
 222 static void pc_dimm_md_set_addr(MemoryDeviceState *md, uint64_t addr,
 223                                 Error **errp)
 224 {
 225     object_property_set_uint(OBJECT(md), PC_DIMM_ADDR_PROP, addr, errp);
 226 }
 227
 228 static MemoryRegion *pc_dimm_md_get_memory_region(MemoryDeviceState *md,
 229                                                   Error **errp)
 230 {
 231     return pc_dimm_get_memory_region(PC_DIMM(md), errp);
 232 }
 233
 234 static void pc_dimm_md_fill_device_info(const MemoryDeviceState *md,
 235                                         MemoryDeviceInfo *info)
 236 {
 237     PCDIMMDeviceInfo *di = g_new0(PCDIMMDeviceInfo, 1);
 238     const DeviceClass *dc = DEVICE_GET_CLASS(md);
 239     const PCDIMMDevice *dimm = PC_DIMM(md);
 240     const DeviceState *dev = DEVICE(md);
 241
 242     if (dev->id) {
 243         di->has_id = true;
 244         di->id = g_strdup(dev->id);
 245     }
 246     di->hotplugged = dev->hotplugged;
 247     di->hotpluggable = dc->hotpluggable;
 248     di->addr = dimm->addr;
 249     di->slot = dimm->slot;
 250     di->node = dimm->node;
 251     di->size = object_property_get_uint(OBJECT(dimm), PC_DIMM_SIZE_PROP,
 252                                         NULL);
 253     di->memdev = object_get_canonical_path(OBJECT(dimm->hostmem));
 254
 255     if (object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM)) {
 256         info->u.nvdimm.data = di;
 257         info->type = MEMORY_DEVICE_INFO_KIND_NVDIMM;
 258     } else {
 259         info->u.dimm.data = di;
 260         info->type = MEMORY_DEVICE_INFO_KIND_DIMM;
 261     }
 262 }
 263
 264 static void pc_dimm_class_init(ObjectClass *oc, void *data)
 265 {
 266     DeviceClass *dc = DEVICE_CLASS(oc);
 267     MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(oc);
 268
 269     dc->realize = pc_dimm_realize;
 270     dc->unrealize = pc_dimm_unrealize;
 271     device_class_set_props(dc, pc_dimm_properties);
 272     dc->desc = "DIMM memory module";
 273
 274     mdc->get_addr = pc_dimm_md_get_addr;
 275     mdc->set_addr = pc_dimm_md_set_addr;
 276     /* for a dimm plugged_size == region_size */
 277     mdc->get_plugged_size = memory_device_get_region_size;
 278     mdc->get_memory_region = pc_dimm_md_get_memory_region;
 279     mdc->fill_device_info = pc_dimm_md_fill_device_info;
 280 }
 281
 282 static TypeInfo pc_dimm_info = {
 283     .name          = TYPE_PC_DIMM,
 284     .parent        = TYPE_DEVICE,
 285     .instance_size = sizeof(PCDIMMDevice),
 286     .instance_init = pc_dimm_init,
 287     .class_init    = pc_dimm_class_init,
 288     .class_size    = sizeof(PCDIMMDeviceClass),
 289     .interfaces = (InterfaceInfo[]) {
 290         { TYPE_MEMORY_DEVICE },
 291         { }
 292     },
 293 };
 294
 295 static void pc_dimm_register_types(void)
 296 {
 297     type_register_static(&pc_dimm_info);
 298 }
 299
 300 type_init(pc_dimm_register_types)