diff options
Diffstat (limited to 'hw/mem/pc-dimm.c')
| -rw-r--r-- | hw/mem/pc-dimm.c | 312 |
1 files changed, 312 insertions, 0 deletions
diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c new file mode 100644 index 00000000..f27e1a11 --- /dev/null +++ b/hw/mem/pc-dimm.c @@ -0,0 +1,312 @@ +/* + * 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, + 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) +{ + 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)); +} + +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)); +} + +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->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); + 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) |