2 * Dimm device for Memory Hotplug
4 * Copyright ProfitBricks GmbH 2012
5 * Copyright (C) 2014 Red Hat Inc
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.
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.
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/>
21 #include "qemu/osdep.h"
22 #include "hw/mem/pc-dimm.h"
23 #include "qapi/error.h"
24 #include "qemu/config-file.h"
25 #include "qapi/visitor.h"
26 #include "qemu/range.h"
27 #include "sysemu/numa.h"
28 #include "sysemu/kvm.h"
30 #include "hw/virtio/vhost.h"
32 typedef struct pc_dimms_capacity
{
37 void pc_dimm_memory_plug(DeviceState
*dev
, MemoryHotplugState
*hpms
,
38 MemoryRegion
*mr
, uint64_t align
, Error
**errp
)
41 MachineState
*machine
= MACHINE(qdev_get_machine());
42 PCDIMMDevice
*dimm
= PC_DIMM(dev
);
43 Error
*local_err
= NULL
;
44 uint64_t existing_dimms_capacity
= 0;
47 addr
= object_property_get_int(OBJECT(dimm
), PC_DIMM_ADDR_PROP
, &local_err
);
52 addr
= pc_dimm_get_free_addr(hpms
->base
,
53 memory_region_size(&hpms
->mr
),
54 !addr
? NULL
: &addr
, align
,
55 memory_region_size(mr
), &local_err
);
60 existing_dimms_capacity
= pc_existing_dimms_capacity(&local_err
);
65 if (existing_dimms_capacity
+ memory_region_size(mr
) >
66 machine
->maxram_size
- machine
->ram_size
) {
67 error_setg(&local_err
, "not enough space, currently 0x%" PRIx64
68 " in use of total hot pluggable 0x" RAM_ADDR_FMT
,
69 existing_dimms_capacity
,
70 machine
->maxram_size
- machine
->ram_size
);
74 object_property_set_int(OBJECT(dev
), addr
, PC_DIMM_ADDR_PROP
, &local_err
);
78 trace_mhp_pc_dimm_assigned_address(addr
);
80 slot
= object_property_get_int(OBJECT(dev
), PC_DIMM_SLOT_PROP
, &local_err
);
85 slot
= pc_dimm_get_free_slot(slot
== PC_DIMM_UNASSIGNED_SLOT
? NULL
: &slot
,
86 machine
->ram_slots
, &local_err
);
90 object_property_set_int(OBJECT(dev
), slot
, PC_DIMM_SLOT_PROP
, &local_err
);
94 trace_mhp_pc_dimm_assigned_slot(slot
);
96 if (kvm_enabled() && !kvm_has_free_slot(machine
)) {
97 error_setg(&local_err
, "hypervisor has no free memory slots left");
101 if (!vhost_has_free_slot()) {
102 error_setg(&local_err
, "a used vhost backend has no free"
103 " memory slots left");
107 memory_region_add_subregion(&hpms
->mr
, addr
- hpms
->base
, mr
);
108 vmstate_register_ram(mr
, dev
);
109 numa_set_mem_node_id(addr
, memory_region_size(mr
), dimm
->node
);
112 error_propagate(errp
, local_err
);
115 void pc_dimm_memory_unplug(DeviceState
*dev
, MemoryHotplugState
*hpms
,
118 PCDIMMDevice
*dimm
= PC_DIMM(dev
);
120 numa_unset_mem_node_id(dimm
->addr
, memory_region_size(mr
), dimm
->node
);
121 memory_region_del_subregion(&hpms
->mr
, mr
);
122 vmstate_unregister_ram(mr
, dev
);
125 static int pc_existing_dimms_capacity_internal(Object
*obj
, void *opaque
)
127 pc_dimms_capacity
*cap
= opaque
;
128 uint64_t *size
= &cap
->size
;
130 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
131 DeviceState
*dev
= DEVICE(obj
);
134 (*size
) += object_property_get_int(obj
, PC_DIMM_SIZE_PROP
,
138 if (cap
->errp
&& *cap
->errp
) {
142 object_child_foreach(obj
, pc_existing_dimms_capacity_internal
, opaque
);
146 uint64_t pc_existing_dimms_capacity(Error
**errp
)
148 pc_dimms_capacity cap
;
153 pc_existing_dimms_capacity_internal(qdev_get_machine(), &cap
);
157 int qmp_pc_dimm_device_list(Object
*obj
, void *opaque
)
159 MemoryDeviceInfoList
***prev
= opaque
;
161 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
162 DeviceState
*dev
= DEVICE(obj
);
165 MemoryDeviceInfoList
*elem
= g_new0(MemoryDeviceInfoList
, 1);
166 MemoryDeviceInfo
*info
= g_new0(MemoryDeviceInfo
, 1);
167 PCDIMMDeviceInfo
*di
= g_new0(PCDIMMDeviceInfo
, 1);
168 DeviceClass
*dc
= DEVICE_GET_CLASS(obj
);
169 PCDIMMDevice
*dimm
= PC_DIMM(obj
);
173 di
->id
= g_strdup(dev
->id
);
175 di
->hotplugged
= dev
->hotplugged
;
176 di
->hotpluggable
= dc
->hotpluggable
;
177 di
->addr
= dimm
->addr
;
178 di
->slot
= dimm
->slot
;
179 di
->node
= dimm
->node
;
180 di
->size
= object_property_get_int(OBJECT(dimm
), PC_DIMM_SIZE_PROP
,
182 di
->memdev
= object_get_canonical_path(OBJECT(dimm
->hostmem
));
184 info
->u
.dimm
.data
= di
;
192 object_child_foreach(obj
, qmp_pc_dimm_device_list
, opaque
);
196 static int pc_dimm_slot2bitmap(Object
*obj
, void *opaque
)
198 unsigned long *bitmap
= opaque
;
200 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
201 DeviceState
*dev
= DEVICE(obj
);
202 if (dev
->realized
) { /* count only realized DIMMs */
203 PCDIMMDevice
*d
= PC_DIMM(obj
);
204 set_bit(d
->slot
, bitmap
);
208 object_child_foreach(obj
, pc_dimm_slot2bitmap
, opaque
);
212 int pc_dimm_get_free_slot(const int *hint
, int max_slots
, Error
**errp
)
214 unsigned long *bitmap
= bitmap_new(max_slots
);
217 object_child_foreach(qdev_get_machine(), pc_dimm_slot2bitmap
, bitmap
);
219 /* check if requested slot is not occupied */
221 if (*hint
>= max_slots
) {
222 error_setg(errp
, "invalid slot# %d, should be less than %d",
224 } else if (!test_bit(*hint
, bitmap
)) {
227 error_setg(errp
, "slot %d is busy", *hint
);
232 /* search for free slot */
233 slot
= find_first_zero_bit(bitmap
, max_slots
);
234 if (slot
== max_slots
) {
235 error_setg(errp
, "no free slots available");
242 static gint
pc_dimm_addr_sort(gconstpointer a
, gconstpointer b
)
244 PCDIMMDevice
*x
= PC_DIMM(a
);
245 PCDIMMDevice
*y
= PC_DIMM(b
);
246 Int128 diff
= int128_sub(int128_make64(x
->addr
), int128_make64(y
->addr
));
248 if (int128_lt(diff
, int128_zero())) {
250 } else if (int128_gt(diff
, int128_zero())) {
256 static int pc_dimm_built_list(Object
*obj
, void *opaque
)
258 GSList
**list
= opaque
;
260 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
261 DeviceState
*dev
= DEVICE(obj
);
262 if (dev
->realized
) { /* only realized DIMMs matter */
263 *list
= g_slist_insert_sorted(*list
, dev
, pc_dimm_addr_sort
);
267 object_child_foreach(obj
, pc_dimm_built_list
, opaque
);
271 uint64_t pc_dimm_get_free_addr(uint64_t address_space_start
,
272 uint64_t address_space_size
,
273 uint64_t *hint
, uint64_t align
, uint64_t size
,
276 GSList
*list
= NULL
, *item
;
277 uint64_t new_addr
, ret
= 0;
278 uint64_t address_space_end
= address_space_start
+ address_space_size
;
280 g_assert(QEMU_ALIGN_UP(address_space_start
, align
) == address_space_start
);
282 if (!address_space_size
) {
283 error_setg(errp
, "memory hotplug is not enabled, "
284 "please add maxmem option");
288 if (hint
&& QEMU_ALIGN_UP(*hint
, align
) != *hint
) {
289 error_setg(errp
, "address must be aligned to 0x%" PRIx64
" bytes",
294 if (QEMU_ALIGN_UP(size
, align
) != size
) {
295 error_setg(errp
, "backend memory size must be multiple of 0x%"
300 assert(address_space_end
> address_space_start
);
301 object_child_foreach(qdev_get_machine(), pc_dimm_built_list
, &list
);
306 new_addr
= address_space_start
;
309 /* find address range that will fit new DIMM */
310 for (item
= list
; item
; item
= g_slist_next(item
)) {
311 PCDIMMDevice
*dimm
= item
->data
;
312 uint64_t dimm_size
= object_property_get_int(OBJECT(dimm
),
319 if (ranges_overlap(dimm
->addr
, dimm_size
, new_addr
, size
)) {
321 DeviceState
*d
= DEVICE(dimm
);
322 error_setg(errp
, "address range conflicts with '%s'", d
->id
);
325 new_addr
= QEMU_ALIGN_UP(dimm
->addr
+ dimm_size
, align
);
330 if (new_addr
< address_space_start
) {
331 error_setg(errp
, "can't add memory [0x%" PRIx64
":0x%" PRIx64
332 "] at 0x%" PRIx64
, new_addr
, size
, address_space_start
);
333 } else if ((new_addr
+ size
) > address_space_end
) {
334 error_setg(errp
, "can't add memory [0x%" PRIx64
":0x%" PRIx64
335 "] beyond 0x%" PRIx64
, new_addr
, size
, address_space_end
);
343 static Property pc_dimm_properties
[] = {
344 DEFINE_PROP_UINT64(PC_DIMM_ADDR_PROP
, PCDIMMDevice
, addr
, 0),
345 DEFINE_PROP_UINT32(PC_DIMM_NODE_PROP
, PCDIMMDevice
, node
, 0),
346 DEFINE_PROP_INT32(PC_DIMM_SLOT_PROP
, PCDIMMDevice
, slot
,
347 PC_DIMM_UNASSIGNED_SLOT
),
348 DEFINE_PROP_END_OF_LIST(),
351 static void pc_dimm_get_size(Object
*obj
, Visitor
*v
, const char *name
,
352 void *opaque
, Error
**errp
)
356 PCDIMMDevice
*dimm
= PC_DIMM(obj
);
358 mr
= host_memory_backend_get_memory(dimm
->hostmem
, errp
);
359 value
= memory_region_size(mr
);
361 visit_type_int(v
, name
, &value
, errp
);
364 static void pc_dimm_check_memdev_is_busy(Object
*obj
, const char *name
,
365 Object
*val
, Error
**errp
)
368 Error
*local_err
= NULL
;
370 mr
= host_memory_backend_get_memory(MEMORY_BACKEND(val
), &local_err
);
374 if (memory_region_is_mapped(mr
)) {
375 char *path
= object_get_canonical_path_component(val
);
376 error_setg(&local_err
, "can't use already busy memdev: %s", path
);
379 qdev_prop_allow_set_link_before_realize(obj
, name
, val
, &local_err
);
383 error_propagate(errp
, local_err
);
386 static void pc_dimm_init(Object
*obj
)
388 PCDIMMDevice
*dimm
= PC_DIMM(obj
);
390 object_property_add(obj
, PC_DIMM_SIZE_PROP
, "int", pc_dimm_get_size
,
391 NULL
, NULL
, NULL
, &error_abort
);
392 object_property_add_link(obj
, PC_DIMM_MEMDEV_PROP
, TYPE_MEMORY_BACKEND
,
393 (Object
**)&dimm
->hostmem
,
394 pc_dimm_check_memdev_is_busy
,
395 OBJ_PROP_LINK_UNREF_ON_RELEASE
,
399 static void pc_dimm_realize(DeviceState
*dev
, Error
**errp
)
401 PCDIMMDevice
*dimm
= PC_DIMM(dev
);
403 if (!dimm
->hostmem
) {
404 error_setg(errp
, "'" PC_DIMM_MEMDEV_PROP
"' property is not set");
407 if (((nb_numa_nodes
> 0) && (dimm
->node
>= nb_numa_nodes
)) ||
408 (!nb_numa_nodes
&& dimm
->node
)) {
409 error_setg(errp
, "'DIMM property " PC_DIMM_NODE_PROP
" has value %"
410 PRIu32
"' which exceeds the number of numa nodes: %d",
411 dimm
->node
, nb_numa_nodes
? nb_numa_nodes
: 1);
416 static MemoryRegion
*pc_dimm_get_memory_region(PCDIMMDevice
*dimm
)
418 return host_memory_backend_get_memory(dimm
->hostmem
, &error_abort
);
421 static void pc_dimm_class_init(ObjectClass
*oc
, void *data
)
423 DeviceClass
*dc
= DEVICE_CLASS(oc
);
424 PCDIMMDeviceClass
*ddc
= PC_DIMM_CLASS(oc
);
426 dc
->realize
= pc_dimm_realize
;
427 dc
->props
= pc_dimm_properties
;
428 dc
->desc
= "DIMM memory module";
430 ddc
->get_memory_region
= pc_dimm_get_memory_region
;
433 static TypeInfo pc_dimm_info
= {
434 .name
= TYPE_PC_DIMM
,
435 .parent
= TYPE_DEVICE
,
436 .instance_size
= sizeof(PCDIMMDevice
),
437 .instance_init
= pc_dimm_init
,
438 .class_init
= pc_dimm_class_init
,
439 .class_size
= sizeof(PCDIMMDeviceClass
),
442 static void pc_dimm_register_types(void)
444 type_register_static(&pc_dimm_info
);
447 type_init(pc_dimm_register_types
)