| /* |
| * Dimm device for Memory Hotplug |
| * |
| * Copyright ProfitBricks GmbH 2012 |
| * Copyright (C) 2014 Red Hat Inc |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, see <http://www.gnu.org/licenses/> |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "hw/boards.h" |
| #include "hw/mem/pc-dimm.h" |
| #include "hw/qdev-properties.h" |
| #include "migration/vmstate.h" |
| #include "hw/mem/nvdimm.h" |
| #include "hw/mem/memory-device.h" |
| #include "qapi/error.h" |
| #include "qapi/visitor.h" |
| #include "qemu/module.h" |
| #include "sysemu/hostmem.h" |
| #include "sysemu/numa.h" |
| #include "trace.h" |
| |
| static int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp); |
| |
| static MemoryRegion *pc_dimm_get_memory_region(PCDIMMDevice *dimm, Error **errp) |
| { |
| if (!dimm->hostmem) { |
| error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property must be set"); |
| return NULL; |
| } |
| |
| return host_memory_backend_get_memory(dimm->hostmem); |
| } |
| |
| void pc_dimm_pre_plug(PCDIMMDevice *dimm, MachineState *machine, Error **errp) |
| { |
| Error *local_err = NULL; |
| int slot; |
| |
| slot = object_property_get_int(OBJECT(dimm), PC_DIMM_SLOT_PROP, |
| &error_abort); |
| if ((slot < 0 || slot >= machine->ram_slots) && |
| slot != PC_DIMM_UNASSIGNED_SLOT) { |
| error_setg(errp, |
| "invalid slot number %d, valid range is [0-%" PRIu64 "]", |
| slot, machine->ram_slots - 1); |
| return; |
| } |
| |
| slot = pc_dimm_get_free_slot(slot == PC_DIMM_UNASSIGNED_SLOT ? NULL : &slot, |
| machine->ram_slots, &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| return; |
| } |
| object_property_set_int(OBJECT(dimm), PC_DIMM_SLOT_PROP, slot, |
| &error_abort); |
| trace_mhp_pc_dimm_assigned_slot(slot); |
| |
| memory_device_pre_plug(MEMORY_DEVICE(dimm), machine, errp); |
| } |
| |
| void pc_dimm_plug(PCDIMMDevice *dimm, MachineState *machine) |
| { |
| MemoryRegion *vmstate_mr = pc_dimm_get_memory_region(dimm, |
| &error_abort); |
| |
| memory_device_plug(MEMORY_DEVICE(dimm), machine); |
| vmstate_register_ram(vmstate_mr, DEVICE(dimm)); |
| /* count only "real" DIMMs, not NVDIMMs */ |
| if (!object_dynamic_cast(OBJECT(dimm), TYPE_NVDIMM)) { |
| machine->device_memory->dimm_size += memory_region_size(vmstate_mr); |
| } |
| } |
| |
| void pc_dimm_unplug(PCDIMMDevice *dimm, MachineState *machine) |
| { |
| MemoryRegion *vmstate_mr = pc_dimm_get_memory_region(dimm, |
| &error_abort); |
| |
| memory_device_unplug(MEMORY_DEVICE(dimm), machine); |
| vmstate_unregister_ram(vmstate_mr, DEVICE(dimm)); |
| if (!object_dynamic_cast(OBJECT(dimm), TYPE_NVDIMM)) { |
| machine->device_memory->dimm_size -= memory_region_size(vmstate_mr); |
| } |
| } |
| |
| static int pc_dimm_slot2bitmap(Object *obj, void *opaque) |
| { |
| unsigned long *bitmap = opaque; |
| |
| if (object_dynamic_cast(obj, TYPE_PC_DIMM)) { |
| DeviceState *dev = DEVICE(obj); |
| if (dev->realized) { /* count only realized DIMMs */ |
| PCDIMMDevice *d = PC_DIMM(obj); |
| set_bit(d->slot, bitmap); |
| } |
| } |
| |
| object_child_foreach(obj, pc_dimm_slot2bitmap, opaque); |
| return 0; |
| } |
| |
| static int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp) |
| { |
| unsigned long *bitmap; |
| int slot = 0; |
| |
| if (max_slots <= 0) { |
| error_setg(errp, "no slots where allocated, please specify " |
| "the 'slots' option"); |
| return slot; |
| } |
| |
| bitmap = bitmap_new(max_slots); |
| object_child_foreach(qdev_get_machine(), pc_dimm_slot2bitmap, bitmap); |
| |
| /* check if requested slot is not occupied */ |
| if (hint) { |
| if (*hint >= max_slots) { |
| error_setg(errp, "invalid slot# %d, should be less than %d", |
| *hint, max_slots); |
| } else if (!test_bit(*hint, bitmap)) { |
| slot = *hint; |
| } else { |
| error_setg(errp, "slot %d is busy", *hint); |
| } |
| goto out; |
| } |
| |
| /* search for free slot */ |
| slot = find_first_zero_bit(bitmap, max_slots); |
| if (slot == max_slots) { |
| error_setg(errp, "no free slots available"); |
| } |
| out: |
| g_free(bitmap); |
| return slot; |
| } |
| |
| static Property pc_dimm_properties[] = { |
| DEFINE_PROP_UINT64(PC_DIMM_ADDR_PROP, PCDIMMDevice, addr, 0), |
| DEFINE_PROP_UINT32(PC_DIMM_NODE_PROP, PCDIMMDevice, node, 0), |
| DEFINE_PROP_INT32(PC_DIMM_SLOT_PROP, PCDIMMDevice, slot, |
| PC_DIMM_UNASSIGNED_SLOT), |
| DEFINE_PROP_LINK(PC_DIMM_MEMDEV_PROP, PCDIMMDevice, hostmem, |
| TYPE_MEMORY_BACKEND, HostMemoryBackend *), |
| DEFINE_PROP_END_OF_LIST(), |
| }; |
| |
| static void pc_dimm_get_size(Object *obj, Visitor *v, const char *name, |
| void *opaque, Error **errp) |
| { |
| Error *local_err = NULL; |
| uint64_t value; |
| |
| value = memory_device_get_region_size(MEMORY_DEVICE(obj), &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| return; |
| } |
| |
| visit_type_uint64(v, name, &value, errp); |
| } |
| |
| static void pc_dimm_init(Object *obj) |
| { |
| object_property_add(obj, PC_DIMM_SIZE_PROP, "uint64", pc_dimm_get_size, |
| NULL, NULL, NULL); |
| } |
| |
| static void pc_dimm_realize(DeviceState *dev, Error **errp) |
| { |
| PCDIMMDevice *dimm = PC_DIMM(dev); |
| PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm); |
| MachineState *ms = MACHINE(qdev_get_machine()); |
| |
| if (ms->numa_state) { |
| int nb_numa_nodes = ms->numa_state->num_nodes; |
| |
| if (((nb_numa_nodes > 0) && (dimm->node >= nb_numa_nodes)) || |
| (!nb_numa_nodes && dimm->node)) { |
| error_setg(errp, "'DIMM property " PC_DIMM_NODE_PROP " has value %" |
| PRIu32 "' which exceeds the number of numa nodes: %d", |
| dimm->node, nb_numa_nodes ? nb_numa_nodes : 1); |
| return; |
| } |
| } else if (dimm->node > 0) { |
| error_setg(errp, "machine doesn't support NUMA"); |
| return; |
| } |
| |
| if (!dimm->hostmem) { |
| error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property is not set"); |
| return; |
| } else if (host_memory_backend_is_mapped(dimm->hostmem)) { |
| error_setg(errp, "can't use already busy memdev: %s", |
| object_get_canonical_path_component(OBJECT(dimm->hostmem))); |
| return; |
| } |
| |
| if (ddc->realize) { |
| ddc->realize(dimm, errp); |
| } |
| |
| host_memory_backend_set_mapped(dimm->hostmem, true); |
| } |
| |
| static void pc_dimm_unrealize(DeviceState *dev) |
| { |
| PCDIMMDevice *dimm = PC_DIMM(dev); |
| PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm); |
| |
| if (ddc->unrealize) { |
| ddc->unrealize(dimm); |
| } |
| |
| host_memory_backend_set_mapped(dimm->hostmem, false); |
| } |
| |
| static uint64_t pc_dimm_md_get_addr(const MemoryDeviceState *md) |
| { |
| return object_property_get_uint(OBJECT(md), PC_DIMM_ADDR_PROP, |
| &error_abort); |
| } |
| |
| static void pc_dimm_md_set_addr(MemoryDeviceState *md, uint64_t addr, |
| Error **errp) |
| { |
| object_property_set_uint(OBJECT(md), PC_DIMM_ADDR_PROP, addr, errp); |
| } |
| |
| static MemoryRegion *pc_dimm_md_get_memory_region(MemoryDeviceState *md, |
| Error **errp) |
| { |
| return pc_dimm_get_memory_region(PC_DIMM(md), errp); |
| } |
| |
| static void pc_dimm_md_fill_device_info(const MemoryDeviceState *md, |
| MemoryDeviceInfo *info) |
| { |
| PCDIMMDeviceInfo *di = g_new0(PCDIMMDeviceInfo, 1); |
| const DeviceClass *dc = DEVICE_GET_CLASS(md); |
| const PCDIMMDevice *dimm = PC_DIMM(md); |
| const DeviceState *dev = DEVICE(md); |
| |
| if (dev->id) { |
| di->id = g_strdup(dev->id); |
| } |
| di->hotplugged = dev->hotplugged; |
| di->hotpluggable = dc->hotpluggable; |
| di->addr = dimm->addr; |
| di->slot = dimm->slot; |
| di->node = dimm->node; |
| di->size = object_property_get_uint(OBJECT(dimm), PC_DIMM_SIZE_PROP, |
| NULL); |
| di->memdev = object_get_canonical_path(OBJECT(dimm->hostmem)); |
| |
| if (object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM)) { |
| info->u.nvdimm.data = di; |
| info->type = MEMORY_DEVICE_INFO_KIND_NVDIMM; |
| } else { |
| info->u.dimm.data = di; |
| info->type = MEMORY_DEVICE_INFO_KIND_DIMM; |
| } |
| } |
| |
| static void pc_dimm_class_init(ObjectClass *oc, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(oc); |
| MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(oc); |
| |
| dc->realize = pc_dimm_realize; |
| dc->unrealize = pc_dimm_unrealize; |
| device_class_set_props(dc, pc_dimm_properties); |
| dc->desc = "DIMM memory module"; |
| |
| mdc->get_addr = pc_dimm_md_get_addr; |
| mdc->set_addr = pc_dimm_md_set_addr; |
| /* for a dimm plugged_size == region_size */ |
| mdc->get_plugged_size = memory_device_get_region_size; |
| mdc->get_memory_region = pc_dimm_md_get_memory_region; |
| mdc->fill_device_info = pc_dimm_md_fill_device_info; |
| } |
| |
| static const TypeInfo pc_dimm_info = { |
| .name = TYPE_PC_DIMM, |
| .parent = TYPE_DEVICE, |
| .instance_size = sizeof(PCDIMMDevice), |
| .instance_init = pc_dimm_init, |
| .class_init = pc_dimm_class_init, |
| .class_size = sizeof(PCDIMMDeviceClass), |
| .interfaces = (InterfaceInfo[]) { |
| { TYPE_MEMORY_DEVICE }, |
| { } |
| }, |
| }; |
| |
| static void pc_dimm_register_types(void) |
| { |
| type_register_static(&pc_dimm_info); |
| } |
| |
| type_init(pc_dimm_register_types) |
