/* * 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 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 */ #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); void pc_dimm_pre_plug(PCDIMMDevice *dimm, MachineState *machine, const uint64_t *legacy_align, 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, legacy_align, errp); } void pc_dimm_plug(PCDIMMDevice *dimm, MachineState *machine, Error **errp) { PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm); MemoryRegion *vmstate_mr = ddc->get_vmstate_memory_region(dimm, &error_abort); memory_device_plug(MEMORY_DEVICE(dimm), machine); vmstate_register_ram(vmstate_mr, DEVICE(dimm)); } void pc_dimm_unplug(PCDIMMDevice *dimm, MachineState *machine) { PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm); MemoryRegion *vmstate_mr = ddc->get_vmstate_memory_region(dimm, &error_abort); memory_device_unplug(MEMORY_DEVICE(dimm), machine); vmstate_unregister_ram(vmstate_mr, DEVICE(dimm)); } 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()); int nb_numa_nodes = ms->numa_state->num_nodes; if (!dimm->hostmem) { error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property is not set"); return; } else if (host_memory_backend_is_mapped(dimm->hostmem)) { char *path = object_get_canonical_path_component(OBJECT(dimm->hostmem)); error_setg(errp, "can't use already busy memdev: %s", path); g_free(path); return; } 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; } 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); host_memory_backend_set_mapped(dimm->hostmem, false); } 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); } 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->has_id = true; 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); PCDIMMDeviceClass *ddc = PC_DIMM_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"; ddc->get_vmstate_memory_region = pc_dimm_get_memory_region; 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 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)