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qemu-e2k/hw/mem/pc-dimm.c

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/*
* 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->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)
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