| /* |
| * 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 <http://www.gnu.org/licenses/> |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "hw/mem/pc-dimm.h" |
| #include "qemu/config-file.h" |
| #include "qapi/visitor.h" |
| #include "qemu/range.h" |
| #include "sysemu/numa.h" |
| #include "sysemu/kvm.h" |
| #include "trace.h" |
| #include "hw/virtio/vhost.h" |
| |
| typedef struct pc_dimms_capacity { |
| uint64_t size; |
| Error **errp; |
| } pc_dimms_capacity; |
| |
| void pc_dimm_memory_plug(DeviceState *dev, MemoryHotplugState *hpms, |
| MemoryRegion *mr, uint64_t align, Error **errp) |
| { |
| int slot; |
| MachineState *machine = MACHINE(qdev_get_machine()); |
| PCDIMMDevice *dimm = PC_DIMM(dev); |
| Error *local_err = NULL; |
| uint64_t existing_dimms_capacity = 0; |
| uint64_t addr; |
| |
| addr = object_property_get_int(OBJECT(dimm), PC_DIMM_ADDR_PROP, &local_err); |
| if (local_err) { |
| goto out; |
| } |
| |
| addr = pc_dimm_get_free_addr(hpms->base, |
| memory_region_size(&hpms->mr), |
| !addr ? NULL : &addr, align, |
| memory_region_size(mr), &local_err); |
| if (local_err) { |
| goto out; |
| } |
| |
| existing_dimms_capacity = pc_existing_dimms_capacity(&local_err); |
| if (local_err) { |
| goto out; |
| } |
| |
| if (existing_dimms_capacity + memory_region_size(mr) > |
| machine->maxram_size - machine->ram_size) { |
| error_setg(&local_err, "not enough space, currently 0x%" PRIx64 |
| " in use of total hot pluggable 0x" RAM_ADDR_FMT, |
| existing_dimms_capacity, |
| machine->maxram_size - machine->ram_size); |
| goto out; |
| } |
| |
| object_property_set_int(OBJECT(dev), addr, PC_DIMM_ADDR_PROP, &local_err); |
| if (local_err) { |
| goto out; |
| } |
| trace_mhp_pc_dimm_assigned_address(addr); |
| |
| slot = object_property_get_int(OBJECT(dev), PC_DIMM_SLOT_PROP, &local_err); |
| if (local_err) { |
| goto out; |
| } |
| |
| slot = pc_dimm_get_free_slot(slot == PC_DIMM_UNASSIGNED_SLOT ? NULL : &slot, |
| machine->ram_slots, &local_err); |
| if (local_err) { |
| goto out; |
| } |
| object_property_set_int(OBJECT(dev), slot, PC_DIMM_SLOT_PROP, &local_err); |
| if (local_err) { |
| goto out; |
| } |
| trace_mhp_pc_dimm_assigned_slot(slot); |
| |
| if (kvm_enabled() && !kvm_has_free_slot(machine)) { |
| error_setg(&local_err, "hypervisor has no free memory slots left"); |
| goto out; |
| } |
| |
| if (!vhost_has_free_slot()) { |
| error_setg(&local_err, "a used vhost backend has no free" |
| " memory slots left"); |
| goto out; |
| } |
| |
| memory_region_add_subregion(&hpms->mr, addr - hpms->base, mr); |
| vmstate_register_ram(mr, dev); |
| numa_set_mem_node_id(addr, memory_region_size(mr), dimm->node); |
| |
| out: |
| error_propagate(errp, local_err); |
| } |
| |
| void pc_dimm_memory_unplug(DeviceState *dev, MemoryHotplugState *hpms, |
| MemoryRegion *mr) |
| { |
| PCDIMMDevice *dimm = PC_DIMM(dev); |
| |
| numa_unset_mem_node_id(dimm->addr, memory_region_size(mr), dimm->node); |
| memory_region_del_subregion(&hpms->mr, mr); |
| vmstate_unregister_ram(mr, dev); |
| } |
| |
| static int pc_existing_dimms_capacity_internal(Object *obj, void *opaque) |
| { |
| pc_dimms_capacity *cap = opaque; |
| uint64_t *size = &cap->size; |
| |
| if (object_dynamic_cast(obj, TYPE_PC_DIMM)) { |
| DeviceState *dev = DEVICE(obj); |
| |
| if (dev->realized) { |
| (*size) += object_property_get_int(obj, PC_DIMM_SIZE_PROP, |
| cap->errp); |
| } |
| |
| if (cap->errp && *cap->errp) { |
| return 1; |
| } |
| } |
| object_child_foreach(obj, pc_existing_dimms_capacity_internal, opaque); |
| return 0; |
| } |
| |
| uint64_t pc_existing_dimms_capacity(Error **errp) |
| { |
| pc_dimms_capacity cap; |
| |
| cap.size = 0; |
| cap.errp = errp; |
| |
| pc_existing_dimms_capacity_internal(qdev_get_machine(), &cap); |
| return cap.size; |
| } |
| |
| int qmp_pc_dimm_device_list(Object *obj, void *opaque) |
| { |
| MemoryDeviceInfoList ***prev = opaque; |
| |
| if (object_dynamic_cast(obj, TYPE_PC_DIMM)) { |
| DeviceState *dev = DEVICE(obj); |
| |
| if (dev->realized) { |
| MemoryDeviceInfoList *elem = g_new0(MemoryDeviceInfoList, 1); |
| MemoryDeviceInfo *info = g_new0(MemoryDeviceInfo, 1); |
| PCDIMMDeviceInfo *di = g_new0(PCDIMMDeviceInfo, 1); |
| DeviceClass *dc = DEVICE_GET_CLASS(obj); |
| PCDIMMDevice *dimm = PC_DIMM(obj); |
| |
| 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_int(OBJECT(dimm), PC_DIMM_SIZE_PROP, |
| NULL); |
| di->memdev = object_get_canonical_path(OBJECT(dimm->hostmem)); |
| |
| info->u.dimm = di; |
| elem->value = info; |
| elem->next = NULL; |
| **prev = elem; |
| *prev = &elem->next; |
| } |
| } |
| |
| object_child_foreach(obj, qmp_pc_dimm_device_list, opaque); |
| return 0; |
| } |
| |
| 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; |
| } |
| |
| int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp) |
| { |
| unsigned long *bitmap = bitmap_new(max_slots); |
| int slot = 0; |
| |
| 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 gint pc_dimm_addr_sort(gconstpointer a, gconstpointer b) |
| { |
| PCDIMMDevice *x = PC_DIMM(a); |
| PCDIMMDevice *y = PC_DIMM(b); |
| Int128 diff = int128_sub(int128_make64(x->addr), int128_make64(y->addr)); |
| |
| if (int128_lt(diff, int128_zero())) { |
| return -1; |
| } else if (int128_gt(diff, int128_zero())) { |
| return 1; |
| } |
| return 0; |
| } |
| |
| static int pc_dimm_built_list(Object *obj, void *opaque) |
| { |
| GSList **list = opaque; |
| |
| if (object_dynamic_cast(obj, TYPE_PC_DIMM)) { |
| DeviceState *dev = DEVICE(obj); |
| if (dev->realized) { /* only realized DIMMs matter */ |
| *list = g_slist_insert_sorted(*list, dev, pc_dimm_addr_sort); |
| } |
| } |
| |
| object_child_foreach(obj, pc_dimm_built_list, opaque); |
| return 0; |
| } |
| |
| uint64_t pc_dimm_get_free_addr(uint64_t address_space_start, |
| uint64_t address_space_size, |
| uint64_t *hint, uint64_t align, uint64_t size, |
| Error **errp) |
| { |
| GSList *list = NULL, *item; |
| uint64_t new_addr, ret = 0; |
| uint64_t address_space_end = address_space_start + address_space_size; |
| |
| g_assert(QEMU_ALIGN_UP(address_space_start, align) == address_space_start); |
| |
| if (!address_space_size) { |
| error_setg(errp, "memory hotplug is not enabled, " |
| "please add maxmem option"); |
| goto out; |
| } |
| |
| if (hint && QEMU_ALIGN_UP(*hint, align) != *hint) { |
| error_setg(errp, "address must be aligned to 0x%" PRIx64 " bytes", |
| align); |
| goto out; |
| } |
| |
| if (QEMU_ALIGN_UP(size, align) != size) { |
| error_setg(errp, "backend memory size must be multiple of 0x%" |
| PRIx64, align); |
| goto out; |
| } |
| |
| assert(address_space_end > address_space_start); |
| object_child_foreach(qdev_get_machine(), pc_dimm_built_list, &list); |
| |
| if (hint) { |
| new_addr = *hint; |
| } else { |
| new_addr = address_space_start; |
| } |
| |
| /* find address range that will fit new DIMM */ |
| for (item = list; item; item = g_slist_next(item)) { |
| PCDIMMDevice *dimm = item->data; |
| uint64_t dimm_size = object_property_get_int(OBJECT(dimm), |
| PC_DIMM_SIZE_PROP, |
| errp); |
| if (errp && *errp) { |
| goto out; |
| } |
| |
| if (ranges_overlap(dimm->addr, dimm_size, new_addr, size)) { |
| if (hint) { |
| DeviceState *d = DEVICE(dimm); |
| error_setg(errp, "address range conflicts with '%s'", d->id); |
| goto out; |
| } |
| new_addr = QEMU_ALIGN_UP(dimm->addr + dimm_size, align); |
| } |
| } |
| ret = new_addr; |
| |
| if (new_addr < address_space_start) { |
| error_setg(errp, "can't add memory [0x%" PRIx64 ":0x%" PRIx64 |
| "] at 0x%" PRIx64, new_addr, size, address_space_start); |
| } else if ((new_addr + size) > address_space_end) { |
| error_setg(errp, "can't add memory [0x%" PRIx64 ":0x%" PRIx64 |
| "] beyond 0x%" PRIx64, new_addr, size, address_space_end); |
| } |
| |
| out: |
| g_slist_free(list); |
| return ret; |
| } |
| |
| 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_END_OF_LIST(), |
| }; |
| |
| static void pc_dimm_get_size(Object *obj, Visitor *v, const char *name, |
| void *opaque, Error **errp) |
| { |
| int64_t value; |
| MemoryRegion *mr; |
| PCDIMMDevice *dimm = PC_DIMM(obj); |
| |
| mr = host_memory_backend_get_memory(dimm->hostmem, errp); |
| value = memory_region_size(mr); |
| |
| visit_type_int(v, name, &value, errp); |
| } |
| |
| static void pc_dimm_check_memdev_is_busy(Object *obj, const char *name, |
| Object *val, Error **errp) |
| { |
| MemoryRegion *mr; |
| Error *local_err = NULL; |
| |
| mr = host_memory_backend_get_memory(MEMORY_BACKEND(val), &local_err); |
| if (local_err) { |
| goto out; |
| } |
| if (memory_region_is_mapped(mr)) { |
| char *path = object_get_canonical_path_component(val); |
| error_setg(&local_err, "can't use already busy memdev: %s", path); |
| g_free(path); |
| } else { |
| qdev_prop_allow_set_link_before_realize(obj, name, val, &local_err); |
| } |
| |
| out: |
| error_propagate(errp, local_err); |
| } |
| |
| static void pc_dimm_init(Object *obj) |
| { |
| PCDIMMDevice *dimm = PC_DIMM(obj); |
| |
| object_property_add(obj, PC_DIMM_SIZE_PROP, "int", pc_dimm_get_size, |
| NULL, NULL, NULL, &error_abort); |
| object_property_add_link(obj, PC_DIMM_MEMDEV_PROP, TYPE_MEMORY_BACKEND, |
| (Object **)&dimm->hostmem, |
| pc_dimm_check_memdev_is_busy, |
| OBJ_PROP_LINK_UNREF_ON_RELEASE, |
| &error_abort); |
| } |
| |
| static void pc_dimm_realize(DeviceState *dev, Error **errp) |
| { |
| PCDIMMDevice *dimm = PC_DIMM(dev); |
| |
| if (!dimm->hostmem) { |
| error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property is not set"); |
| 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; |
| } |
| } |
| |
| static MemoryRegion *pc_dimm_get_memory_region(PCDIMMDevice *dimm) |
| { |
| return host_memory_backend_get_memory(dimm->hostmem, &error_abort); |
| } |
| |
| static void pc_dimm_class_init(ObjectClass *oc, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(oc); |
| PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc); |
| |
| dc->realize = pc_dimm_realize; |
| dc->props = pc_dimm_properties; |
| dc->desc = "DIMM memory module"; |
| |
| ddc->get_memory_region = pc_dimm_get_memory_region; |
| } |
| |
| 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), |
| }; |
| |
| static void pc_dimm_register_types(void) |
| { |
| type_register_static(&pc_dimm_info); |
| } |
| |
| type_init(pc_dimm_register_types) |
