[mirror_qemu.git] / hw / mem / pc-dimm.c

/*
 * 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 "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"

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;
    }

    memory_region_add_subregion(&hpms->mr, addr - hpms->base, mr);
    vmstate_register_ram(mr, dev);

out:
    error_propagate(errp, local_err);
}

void pc_dimm_memory_unplug(DeviceState *dev, MemoryHotplugState *hpms,
                           MemoryRegion *mr)
{
    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->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;
}

ram_addr_t get_current_ram_size(void)
{
    MemoryDeviceInfoList *info_list = NULL;
    MemoryDeviceInfoList **prev = &info_list;
    MemoryDeviceInfoList *info;
    ram_addr_t size = ram_size;

    qmp_pc_dimm_device_list(qdev_get_machine(), &prev);
    for (info = info_list; info; info = info->next) {
        MemoryDeviceInfo *value = info->value;

        if (value) {
            switch (value->kind) {
            case MEMORY_DEVICE_INFO_KIND_DIMM:
                size += value->dimm->size;
                break;
            default:
                break;
            }
        }
    }
    qapi_free_MemoryDeviceInfoList(info_list);

    return size;
}

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, void *opaque,
                          const char *name, 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, &value, name, errp);
}

static void pc_dimm_check_memdev_is_busy(Object *obj, const char *name,
                                      Object *val, Error **errp)
{
    MemoryRegion *mr;

    mr = host_memory_backend_get_memory(MEMORY_BACKEND(val), errp);
    if (memory_region_is_mapped(mr)) {
        char *path = object_get_canonical_path_component(val);
        error_setg(errp, "can't use already busy memdev: %s", path);
        g_free(path);
    } else {
        qdev_prop_allow_set_link_before_realize(obj, name, val, errp);
    }
}

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)) {
        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);
        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)
Commit	Line	Data
10b7e74b VL	1	/*
	2	* Dimm device for Memory Hotplug
	3	*
	4	* Copyright ProfitBricks GmbH 2012
	5	* Copyright (C) 2014 Red Hat Inc
	6	*
	7	* This library is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2 of the License, or (at your option) any later version.
	11	*
	12	* This library is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with this library; if not, see <http://www.gnu.org/licenses/>
	19	*/
	20
	21	#include "hw/mem/pc-dimm.h"
	22	#include "qemu/config-file.h"
	23	#include "qapi/visitor.h"
0b312571	24	#include "qemu/range.h"
e35704ba	25	#include "sysemu/numa.h"
43bbb49e BR	26	#include "sysemu/kvm.h"
43bbb49e BR	27	#include "trace.h"
9967c949	28
37153450 BR	29	typedef struct pc_dimms_capacity {
	30	uint64_t size;
	31	Error **errp;
	32	} pc_dimms_capacity;
	33
43bbb49e BR	34	void pc_dimm_memory_plug(DeviceState dev, MemoryHotplugState hpms,
	35	MemoryRegion mr, uint64_t align, Error *errp)
	36	{
	37	int slot;
	38	MachineState *machine = MACHINE(qdev_get_machine());
	39	PCDIMMDevice *dimm = PC_DIMM(dev);
	40	Error *local_err = NULL;
	41	uint64_t existing_dimms_capacity = 0;
	42	uint64_t addr;
	43
	44	addr = object_property_get_int(OBJECT(dimm), PC_DIMM_ADDR_PROP, &local_err);
	45	if (local_err) {
	46	goto out;
	47	}
	48
	49	addr = pc_dimm_get_free_addr(hpms->base,
	50	memory_region_size(&hpms->mr),
	51	!addr ? NULL : &addr, align,
	52	memory_region_size(mr), &local_err);
	53	if (local_err) {
	54	goto out;
	55	}
	56
	57	existing_dimms_capacity = pc_existing_dimms_capacity(&local_err);
	58	if (local_err) {
	59	goto out;
	60	}
	61
	62	if (existing_dimms_capacity + memory_region_size(mr) >
	63	machine->maxram_size - machine->ram_size) {
	64	error_setg(&local_err, "not enough space, currently 0x%" PRIx64
	65	" in use of total hot pluggable 0x" RAM_ADDR_FMT,
	66	existing_dimms_capacity,
	67	machine->maxram_size - machine->ram_size);
	68	goto out;
	69	}
	70
	71	object_property_set_int(OBJECT(dev), addr, PC_DIMM_ADDR_PROP, &local_err);
	72	if (local_err) {
	73	goto out;
	74	}
	75	trace_mhp_pc_dimm_assigned_address(addr);
	76
	77	slot = object_property_get_int(OBJECT(dev), PC_DIMM_SLOT_PROP, &local_err);
	78	if (local_err) {
	79	goto out;
	80	}
	81
	82	slot = pc_dimm_get_free_slot(slot == PC_DIMM_UNASSIGNED_SLOT ? NULL : &slot,
	83	machine->ram_slots, &local_err);
	84	if (local_err) {
	85	goto out;
	86	}
	87	object_property_set_int(OBJECT(dev), slot, PC_DIMM_SLOT_PROP, &local_err);
	88	if (local_err) {
	89	goto out;
	90	}
	91	trace_mhp_pc_dimm_assigned_slot(slot);
	92
	93	if (kvm_enabled() && !kvm_has_free_slot(machine)) {
	94	error_setg(&local_err, "hypervisor has no free memory slots left");
	95	goto out;
	96	}
	97
98	memory_region_add_subregion(&hpms->mr, addr - hpms->base, mr);
99	vmstate_register_ram(mr, dev);
100
101	out:
102	error_propagate(errp, local_err);
103	}
104
105	void pc_dimm_memory_unplug(DeviceState dev, MemoryHotplugState hpms,
106	MemoryRegion *mr)
107	{
108	memory_region_del_subregion(&hpms->mr, mr);
109	vmstate_unregister_ram(mr, dev);
110	}
111
37153450	112	static int pc_existing_dimms_capacity_internal(Object obj, void opaque)
9967c949	113	{
37153450 BR	114	pc_dimms_capacity *cap = opaque;
37153450 BR	115	uint64_t *size = &cap->size;
9967c949 BR	116
	117	if (object_dynamic_cast(obj, TYPE_PC_DIMM)) {
	118	DeviceState *dev = DEVICE(obj);
	119
	120	if (dev->realized) {
	121	(*size) += object_property_get_int(obj, PC_DIMM_SIZE_PROP,
37153450	122	cap->errp);
9967c949 BR	123	}
9967c949 BR	124
37153450	125	if (cap->errp && *cap->errp) {
9967c949 BR	126	return 1;
	127	}
	128	}
37153450	129	object_child_foreach(obj, pc_existing_dimms_capacity_internal, opaque);
9967c949 BR	130	return 0;
9967c949 BR	131	}
0b312571	132
37153450 BR	133	uint64_t pc_existing_dimms_capacity(Error **errp)
	134	{
	135	pc_dimms_capacity cap;
	136
	137	cap.size = 0;
	138	cap.errp = errp;
	139
	140	pc_existing_dimms_capacity_internal(qdev_get_machine(), &cap);
	141	return cap.size;
	142	}
	143
6f2e2730 IM	144	int qmp_pc_dimm_device_list(Object obj, void opaque)
	145	{
	146	MemoryDeviceInfoList ***prev = opaque;
	147
	148	if (object_dynamic_cast(obj, TYPE_PC_DIMM)) {
	149	DeviceState *dev = DEVICE(obj);
	150
	151	if (dev->realized) {
	152	MemoryDeviceInfoList *elem = g_new0(MemoryDeviceInfoList, 1);
	153	MemoryDeviceInfo *info = g_new0(MemoryDeviceInfo, 1);
	154	PCDIMMDeviceInfo *di = g_new0(PCDIMMDeviceInfo, 1);
	155	DeviceClass *dc = DEVICE_GET_CLASS(obj);
	156	PCDIMMDevice *dimm = PC_DIMM(obj);
	157
	158	if (dev->id) {
	159	di->has_id = true;
	160	di->id = g_strdup(dev->id);
	161	}
	162	di->hotplugged = dev->hotplugged;
	163	di->hotpluggable = dc->hotpluggable;
	164	di->addr = dimm->addr;
	165	di->slot = dimm->slot;
	166	di->node = dimm->node;
	167	di->size = object_property_get_int(OBJECT(dimm), PC_DIMM_SIZE_PROP,
	168	NULL);
	169	di->memdev = object_get_canonical_path(OBJECT(dimm->hostmem));
	170
	171	info->dimm = di;
	172	elem->value = info;
	173	elem->next = NULL;
	174	**prev = elem;
	175	*prev = &elem->next;
	176	}
	177	}
	178
	179	object_child_foreach(obj, qmp_pc_dimm_device_list, opaque);
	180	return 0;
	181	}
	182
87a45cfe HZ	183	ram_addr_t get_current_ram_size(void)
	184	{
	185	MemoryDeviceInfoList *info_list = NULL;
	186	MemoryDeviceInfoList **prev = &info_list;
	187	MemoryDeviceInfoList *info;
	188	ram_addr_t size = ram_size;
	189
	190	qmp_pc_dimm_device_list(qdev_get_machine(), &prev);
	191	for (info = info_list; info; info = info->next) {
	192	MemoryDeviceInfo *value = info->value;
	193
	194	if (value) {
	195	switch (value->kind) {
	196	case MEMORY_DEVICE_INFO_KIND_DIMM:
	197	size += value->dimm->size;
	198	break;
	199	default:
	200	break;
	201	}
	202	}
	203	}
	204	qapi_free_MemoryDeviceInfoList(info_list);
	205
	206	return size;
	207	}
	208
0cd03d89 IM	209	static int pc_dimm_slot2bitmap(Object obj, void opaque)
	210	{
	211	unsigned long *bitmap = opaque;
	212
	213	if (object_dynamic_cast(obj, TYPE_PC_DIMM)) {
	214	DeviceState *dev = DEVICE(obj);
	215	if (dev->realized) { /* count only realized DIMMs */
	216	PCDIMMDevice *d = PC_DIMM(obj);
	217	set_bit(d->slot, bitmap);
	218	}
	219	}
	220
	221	object_child_foreach(obj, pc_dimm_slot2bitmap, opaque);
	222	return 0;
	223	}
	224
	225	int pc_dimm_get_free_slot(const int hint, int max_slots, Error *errp)
	226	{
	227	unsigned long *bitmap = bitmap_new(max_slots);
	228	int slot = 0;
	229
	230	object_child_foreach(qdev_get_machine(), pc_dimm_slot2bitmap, bitmap);
	231
	232	/* check if requested slot is not occupied */
	233	if (hint) {
	234	if (*hint >= max_slots) {
	235	error_setg(errp, "invalid slot# %d, should be less than %d",
	236	*hint, max_slots);
	237	} else if (!test_bit(*hint, bitmap)) {
	238	slot = *hint;
	239	} else {
	240	error_setg(errp, "slot %d is busy", *hint);
	241	}
	242	goto out;
	243	}
	244
	245	/* search for free slot */
	246	slot = find_first_zero_bit(bitmap, max_slots);
	247	if (slot == max_slots) {
	248	error_setg(errp, "no free slots available");
	249	}
	250	out:
	251	g_free(bitmap);
	252	return slot;
	253	}
	254
0b312571 IM	255	static gint pc_dimm_addr_sort(gconstpointer a, gconstpointer b)
	256	{
	257	PCDIMMDevice *x = PC_DIMM(a);
	258	PCDIMMDevice *y = PC_DIMM(b);
	259	Int128 diff = int128_sub(int128_make64(x->addr), int128_make64(y->addr));
	260
	261	if (int128_lt(diff, int128_zero())) {
	262	return -1;
	263	} else if (int128_gt(diff, int128_zero())) {
	264	return 1;
	265	}
	266	return 0;
	267	}
	268
	269	static int pc_dimm_built_list(Object obj, void opaque)
	270	{
	271	GSList **list = opaque;
	272
	273	if (object_dynamic_cast(obj, TYPE_PC_DIMM)) {
	274	DeviceState *dev = DEVICE(obj);
	275	if (dev->realized) { /* only realized DIMMs matter */
	276	list = g_slist_insert_sorted(list, dev, pc_dimm_addr_sort);
	277	}
	278	}
	279
	280	object_child_foreach(obj, pc_dimm_built_list, opaque);
	281	return 0;
	282	}
	283
	284	uint64_t pc_dimm_get_free_addr(uint64_t address_space_start,
	285	uint64_t address_space_size,
92a37a04	286	uint64_t *hint, uint64_t align, uint64_t size,
0b312571 IM	287	Error **errp)
	288	{
	289	GSList list = NULL, item;
	290	uint64_t new_addr, ret = 0;
	291	uint64_t address_space_end = address_space_start + address_space_size;
	292
0c0de1b6	293	g_assert(QEMU_ALIGN_UP(address_space_start, align) == address_space_start);
0c0de1b6	294
9b79a76c IM	295	if (!address_space_size) {
	296	error_setg(errp, "memory hotplug is not enabled, "
	297	"please add maxmem option");
	298	goto out;
	299	}
	300
92a37a04 IM	301	if (hint && QEMU_ALIGN_UP(hint, align) != hint) {
	302	error_setg(errp, "address must be aligned to 0x%" PRIx64 " bytes",
	303	align);
	304	goto out;
	305	}
	306
	307	if (QEMU_ALIGN_UP(size, align) != size) {
	308	error_setg(errp, "backend memory size must be multiple of 0x%"
	309	PRIx64, align);
	310	goto out;
	311	}
	312
9b79a76c	313	assert(address_space_end > address_space_start);
0b312571 IM	314	object_child_foreach(qdev_get_machine(), pc_dimm_built_list, &list);
	315
	316	if (hint) {
	317	new_addr = *hint;
	318	} else {
	319	new_addr = address_space_start;
	320	}
	321
	322	/* find address range that will fit new DIMM */
	323	for (item = list; item; item = g_slist_next(item)) {
	324	PCDIMMDevice *dimm = item->data;
	325	uint64_t dimm_size = object_property_get_int(OBJECT(dimm),
	326	PC_DIMM_SIZE_PROP,
	327	errp);
	328	if (errp && *errp) {
	329	goto out;
	330	}
	331
	332	if (ranges_overlap(dimm->addr, dimm_size, new_addr, size)) {
	333	if (hint) {
	334	DeviceState *d = DEVICE(dimm);
	335	error_setg(errp, "address range conflicts with '%s'", d->id);
	336	goto out;
	337	}
0c0de1b6	338	new_addr = QEMU_ALIGN_UP(dimm->addr + dimm_size, align);
0b312571 IM	339	}
	340	}
	341	ret = new_addr;
	342
	343	if (new_addr < address_space_start) {
	344	error_setg(errp, "can't add memory [0x%" PRIx64 ":0x%" PRIx64
	345	"] at 0x%" PRIx64, new_addr, size, address_space_start);
	346	} else if ((new_addr + size) > address_space_end) {
	347	error_setg(errp, "can't add memory [0x%" PRIx64 ":0x%" PRIx64
	348	"] beyond 0x%" PRIx64, new_addr, size, address_space_end);
	349	}
	350
	351	out:
	352	g_slist_free(list);
	353	return ret;
	354	}
10b7e74b VL	355
	356	static Property pc_dimm_properties[] = {
	357	DEFINE_PROP_UINT64(PC_DIMM_ADDR_PROP, PCDIMMDevice, addr, 0),
	358	DEFINE_PROP_UINT32(PC_DIMM_NODE_PROP, PCDIMMDevice, node, 0),
	359	DEFINE_PROP_INT32(PC_DIMM_SLOT_PROP, PCDIMMDevice, slot,
	360	PC_DIMM_UNASSIGNED_SLOT),
	361	DEFINE_PROP_END_OF_LIST(),
	362	};
	363
	364	static void pc_dimm_get_size(Object obj, Visitor v, void *opaque,
	365	const char name, Error *errp)
	366	{
	367	int64_t value;
	368	MemoryRegion *mr;
	369	PCDIMMDevice *dimm = PC_DIMM(obj);
	370
	371	mr = host_memory_backend_get_memory(dimm->hostmem, errp);
	372	value = memory_region_size(mr);
	373
	374	visit_type_int(v, &value, name, errp);
	375	}
	376
7bb5d6ad IM	377	static void pc_dimm_check_memdev_is_busy(Object obj, const char name,
	378	Object val, Error *errp)
	379	{
	380	MemoryRegion *mr;
	381
	382	mr = host_memory_backend_get_memory(MEMORY_BACKEND(val), errp);
	383	if (memory_region_is_mapped(mr)) {
	384	char *path = object_get_canonical_path_component(val);
	385	error_setg(errp, "can't use already busy memdev: %s", path);
	386	g_free(path);
	387	} else {
	388	qdev_prop_allow_set_link_before_realize(obj, name, val, errp);
	389	}
	390	}
	391
10b7e74b VL	392	static void pc_dimm_init(Object *obj)
	393	{
	394	PCDIMMDevice *dimm = PC_DIMM(obj);
	395
	396	object_property_add(obj, PC_DIMM_SIZE_PROP, "int", pc_dimm_get_size,
	397	NULL, NULL, NULL, &error_abort);
	398	object_property_add_link(obj, PC_DIMM_MEMDEV_PROP, TYPE_MEMORY_BACKEND,
	399	(Object **)&dimm->hostmem,
7bb5d6ad	400	pc_dimm_check_memdev_is_busy,
10b7e74b VL	401	OBJ_PROP_LINK_UNREF_ON_RELEASE,
	402	&error_abort);
	403	}
	404
	405	static void pc_dimm_realize(DeviceState dev, Error *errp)
	406	{
	407	PCDIMMDevice *dimm = PC_DIMM(dev);
	408
	409	if (!dimm->hostmem) {
	410	error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property is not set");
	411	return;
	412	}
fc50ff06	413	if ((nb_numa_nodes > 0) && (dimm->node >= nb_numa_nodes)) {
988eba0f MT	414	error_setg(errp, "'DIMM property " PC_DIMM_NODE_PROP " has value %"
	415	PRIu32 "' which exceeds the number of numa nodes: %d",
	416	dimm->node, nb_numa_nodes);
cfe0ffd0 HT	417	return;
cfe0ffd0 HT	418	}
10b7e74b VL	419	}
	420
	421	static MemoryRegion pc_dimm_get_memory_region(PCDIMMDevice dimm)
	422	{
	423	return host_memory_backend_get_memory(dimm->hostmem, &error_abort);
	424	}
	425
	426	static void pc_dimm_class_init(ObjectClass oc, void data)
	427	{
	428	DeviceClass *dc = DEVICE_CLASS(oc);
	429	PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc);
	430
	431	dc->realize = pc_dimm_realize;
	432	dc->props = pc_dimm_properties;
bdd09778	433	dc->desc = "DIMM memory module";
10b7e74b VL	434
	435	ddc->get_memory_region = pc_dimm_get_memory_region;
	436	}
	437
	438	static TypeInfo pc_dimm_info = {
	439	.name = TYPE_PC_DIMM,
	440	.parent = TYPE_DEVICE,
	441	.instance_size = sizeof(PCDIMMDevice),
	442	.instance_init = pc_dimm_init,
	443	.class_init = pc_dimm_class_init,
	444	.class_size = sizeof(PCDIMMDeviceClass),
	445	};
	446
	447	static void pc_dimm_register_types(void)
	448	{
	449	type_register_static(&pc_dimm_info);
	450	}
	451
	452	type_init(pc_dimm_register_types)