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 "hw/mem/pc-dimm.h"
22 #include "qemu/config-file.h"
23 #include "qapi/visitor.h"
24 #include "qemu/range.h"
25 #include "sysemu/numa.h"
26 #include "sysemu/kvm.h"
29 typedef struct pc_dimms_capacity
{
34 void pc_dimm_memory_plug(DeviceState
*dev
, MemoryHotplugState
*hpms
,
35 MemoryRegion
*mr
, uint64_t align
, bool gap
,
39 MachineState
*machine
= MACHINE(qdev_get_machine());
40 PCDIMMDevice
*dimm
= PC_DIMM(dev
);
41 Error
*local_err
= NULL
;
42 uint64_t existing_dimms_capacity
= 0;
45 addr
= object_property_get_int(OBJECT(dimm
), PC_DIMM_ADDR_PROP
, &local_err
);
50 addr
= pc_dimm_get_free_addr(hpms
->base
,
51 memory_region_size(&hpms
->mr
),
52 !addr
? NULL
: &addr
, align
, gap
,
53 memory_region_size(mr
), &local_err
);
58 existing_dimms_capacity
= pc_existing_dimms_capacity(&local_err
);
63 if (existing_dimms_capacity
+ memory_region_size(mr
) >
64 machine
->maxram_size
- machine
->ram_size
) {
65 error_setg(&local_err
, "not enough space, currently 0x%" PRIx64
66 " in use of total hot pluggable 0x" RAM_ADDR_FMT
,
67 existing_dimms_capacity
,
68 machine
->maxram_size
- machine
->ram_size
);
72 object_property_set_int(OBJECT(dev
), addr
, PC_DIMM_ADDR_PROP
, &local_err
);
76 trace_mhp_pc_dimm_assigned_address(addr
);
78 slot
= object_property_get_int(OBJECT(dev
), PC_DIMM_SLOT_PROP
, &local_err
);
83 slot
= pc_dimm_get_free_slot(slot
== PC_DIMM_UNASSIGNED_SLOT
? NULL
: &slot
,
84 machine
->ram_slots
, &local_err
);
88 object_property_set_int(OBJECT(dev
), slot
, PC_DIMM_SLOT_PROP
, &local_err
);
92 trace_mhp_pc_dimm_assigned_slot(slot
);
94 if (kvm_enabled() && !kvm_has_free_slot(machine
)) {
95 error_setg(&local_err
, "hypervisor has no free memory slots left");
99 memory_region_add_subregion(&hpms
->mr
, addr
- hpms
->base
, mr
);
100 vmstate_register_ram(mr
, dev
);
101 numa_set_mem_node_id(addr
, memory_region_size(mr
), dimm
->node
);
104 error_propagate(errp
, local_err
);
107 void pc_dimm_memory_unplug(DeviceState
*dev
, MemoryHotplugState
*hpms
,
110 PCDIMMDevice
*dimm
= PC_DIMM(dev
);
112 numa_unset_mem_node_id(dimm
->addr
, memory_region_size(mr
), dimm
->node
);
113 memory_region_del_subregion(&hpms
->mr
, mr
);
114 vmstate_unregister_ram(mr
, dev
);
117 static int pc_existing_dimms_capacity_internal(Object
*obj
, void *opaque
)
119 pc_dimms_capacity
*cap
= opaque
;
120 uint64_t *size
= &cap
->size
;
122 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
123 DeviceState
*dev
= DEVICE(obj
);
126 (*size
) += object_property_get_int(obj
, PC_DIMM_SIZE_PROP
,
130 if (cap
->errp
&& *cap
->errp
) {
134 object_child_foreach(obj
, pc_existing_dimms_capacity_internal
, opaque
);
138 uint64_t pc_existing_dimms_capacity(Error
**errp
)
140 pc_dimms_capacity cap
;
145 pc_existing_dimms_capacity_internal(qdev_get_machine(), &cap
);
149 int qmp_pc_dimm_device_list(Object
*obj
, void *opaque
)
151 MemoryDeviceInfoList
***prev
= opaque
;
153 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
154 DeviceState
*dev
= DEVICE(obj
);
157 MemoryDeviceInfoList
*elem
= g_new0(MemoryDeviceInfoList
, 1);
158 MemoryDeviceInfo
*info
= g_new0(MemoryDeviceInfo
, 1);
159 PCDIMMDeviceInfo
*di
= g_new0(PCDIMMDeviceInfo
, 1);
160 DeviceClass
*dc
= DEVICE_GET_CLASS(obj
);
161 PCDIMMDevice
*dimm
= PC_DIMM(obj
);
165 di
->id
= g_strdup(dev
->id
);
167 di
->hotplugged
= dev
->hotplugged
;
168 di
->hotpluggable
= dc
->hotpluggable
;
169 di
->addr
= dimm
->addr
;
170 di
->slot
= dimm
->slot
;
171 di
->node
= dimm
->node
;
172 di
->size
= object_property_get_int(OBJECT(dimm
), PC_DIMM_SIZE_PROP
,
174 di
->memdev
= object_get_canonical_path(OBJECT(dimm
->hostmem
));
184 object_child_foreach(obj
, qmp_pc_dimm_device_list
, opaque
);
188 ram_addr_t
get_current_ram_size(void)
190 MemoryDeviceInfoList
*info_list
= NULL
;
191 MemoryDeviceInfoList
**prev
= &info_list
;
192 MemoryDeviceInfoList
*info
;
193 ram_addr_t size
= ram_size
;
195 qmp_pc_dimm_device_list(qdev_get_machine(), &prev
);
196 for (info
= info_list
; info
; info
= info
->next
) {
197 MemoryDeviceInfo
*value
= info
->value
;
200 switch (value
->kind
) {
201 case MEMORY_DEVICE_INFO_KIND_DIMM
:
202 size
+= value
->dimm
->size
;
209 qapi_free_MemoryDeviceInfoList(info_list
);
214 static int pc_dimm_slot2bitmap(Object
*obj
, void *opaque
)
216 unsigned long *bitmap
= opaque
;
218 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
219 DeviceState
*dev
= DEVICE(obj
);
220 if (dev
->realized
) { /* count only realized DIMMs */
221 PCDIMMDevice
*d
= PC_DIMM(obj
);
222 set_bit(d
->slot
, bitmap
);
226 object_child_foreach(obj
, pc_dimm_slot2bitmap
, opaque
);
230 int pc_dimm_get_free_slot(const int *hint
, int max_slots
, Error
**errp
)
232 unsigned long *bitmap
= bitmap_new(max_slots
);
235 object_child_foreach(qdev_get_machine(), pc_dimm_slot2bitmap
, bitmap
);
237 /* check if requested slot is not occupied */
239 if (*hint
>= max_slots
) {
240 error_setg(errp
, "invalid slot# %d, should be less than %d",
242 } else if (!test_bit(*hint
, bitmap
)) {
245 error_setg(errp
, "slot %d is busy", *hint
);
250 /* search for free slot */
251 slot
= find_first_zero_bit(bitmap
, max_slots
);
252 if (slot
== max_slots
) {
253 error_setg(errp
, "no free slots available");
260 static gint
pc_dimm_addr_sort(gconstpointer a
, gconstpointer b
)
262 PCDIMMDevice
*x
= PC_DIMM(a
);
263 PCDIMMDevice
*y
= PC_DIMM(b
);
264 Int128 diff
= int128_sub(int128_make64(x
->addr
), int128_make64(y
->addr
));
266 if (int128_lt(diff
, int128_zero())) {
268 } else if (int128_gt(diff
, int128_zero())) {
274 static int pc_dimm_built_list(Object
*obj
, void *opaque
)
276 GSList
**list
= opaque
;
278 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
279 DeviceState
*dev
= DEVICE(obj
);
280 if (dev
->realized
) { /* only realized DIMMs matter */
281 *list
= g_slist_insert_sorted(*list
, dev
, pc_dimm_addr_sort
);
285 object_child_foreach(obj
, pc_dimm_built_list
, opaque
);
289 uint64_t pc_dimm_get_free_addr(uint64_t address_space_start
,
290 uint64_t address_space_size
,
291 uint64_t *hint
, uint64_t align
, bool gap
,
292 uint64_t size
, Error
**errp
)
294 GSList
*list
= NULL
, *item
;
295 uint64_t new_addr
, ret
= 0;
296 uint64_t address_space_end
= address_space_start
+ address_space_size
;
298 g_assert(QEMU_ALIGN_UP(address_space_start
, align
) == address_space_start
);
300 if (!address_space_size
) {
301 error_setg(errp
, "memory hotplug is not enabled, "
302 "please add maxmem option");
306 if (hint
&& QEMU_ALIGN_UP(*hint
, align
) != *hint
) {
307 error_setg(errp
, "address must be aligned to 0x%" PRIx64
" bytes",
312 if (QEMU_ALIGN_UP(size
, align
) != size
) {
313 error_setg(errp
, "backend memory size must be multiple of 0x%"
318 assert(address_space_end
> address_space_start
);
319 object_child_foreach(qdev_get_machine(), pc_dimm_built_list
, &list
);
324 new_addr
= address_space_start
;
327 /* find address range that will fit new DIMM */
328 for (item
= list
; item
; item
= g_slist_next(item
)) {
329 PCDIMMDevice
*dimm
= item
->data
;
330 uint64_t dimm_size
= object_property_get_int(OBJECT(dimm
),
337 if (ranges_overlap(dimm
->addr
, dimm_size
, new_addr
,
338 size
+ (gap
? 1 : 0))) {
340 DeviceState
*d
= DEVICE(dimm
);
341 error_setg(errp
, "address range conflicts with '%s'", d
->id
);
344 new_addr
= QEMU_ALIGN_UP(dimm
->addr
+ dimm_size
+ (gap
? 1 : 0),
350 if (new_addr
< address_space_start
) {
351 error_setg(errp
, "can't add memory [0x%" PRIx64
":0x%" PRIx64
352 "] at 0x%" PRIx64
, new_addr
, size
, address_space_start
);
353 } else if ((new_addr
+ size
) > address_space_end
) {
354 error_setg(errp
, "can't add memory [0x%" PRIx64
":0x%" PRIx64
355 "] beyond 0x%" PRIx64
, new_addr
, size
, address_space_end
);
363 static Property pc_dimm_properties
[] = {
364 DEFINE_PROP_UINT64(PC_DIMM_ADDR_PROP
, PCDIMMDevice
, addr
, 0),
365 DEFINE_PROP_UINT32(PC_DIMM_NODE_PROP
, PCDIMMDevice
, node
, 0),
366 DEFINE_PROP_INT32(PC_DIMM_SLOT_PROP
, PCDIMMDevice
, slot
,
367 PC_DIMM_UNASSIGNED_SLOT
),
368 DEFINE_PROP_END_OF_LIST(),
371 static void pc_dimm_get_size(Object
*obj
, Visitor
*v
, void *opaque
,
372 const char *name
, Error
**errp
)
376 PCDIMMDevice
*dimm
= PC_DIMM(obj
);
378 mr
= host_memory_backend_get_memory(dimm
->hostmem
, errp
);
379 value
= memory_region_size(mr
);
381 visit_type_int(v
, &value
, name
, errp
);
384 static void pc_dimm_check_memdev_is_busy(Object
*obj
, const char *name
,
385 Object
*val
, Error
**errp
)
389 mr
= host_memory_backend_get_memory(MEMORY_BACKEND(val
), errp
);
390 if (memory_region_is_mapped(mr
)) {
391 char *path
= object_get_canonical_path_component(val
);
392 error_setg(errp
, "can't use already busy memdev: %s", path
);
395 qdev_prop_allow_set_link_before_realize(obj
, name
, val
, errp
);
399 static void pc_dimm_init(Object
*obj
)
401 PCDIMMDevice
*dimm
= PC_DIMM(obj
);
403 object_property_add(obj
, PC_DIMM_SIZE_PROP
, "int", pc_dimm_get_size
,
404 NULL
, NULL
, NULL
, &error_abort
);
405 object_property_add_link(obj
, PC_DIMM_MEMDEV_PROP
, TYPE_MEMORY_BACKEND
,
406 (Object
**)&dimm
->hostmem
,
407 pc_dimm_check_memdev_is_busy
,
408 OBJ_PROP_LINK_UNREF_ON_RELEASE
,
412 static void pc_dimm_realize(DeviceState
*dev
, Error
**errp
)
414 PCDIMMDevice
*dimm
= PC_DIMM(dev
);
416 if (!dimm
->hostmem
) {
417 error_setg(errp
, "'" PC_DIMM_MEMDEV_PROP
"' property is not set");
420 if (((nb_numa_nodes
> 0) && (dimm
->node
>= nb_numa_nodes
)) ||
421 (!nb_numa_nodes
&& dimm
->node
)) {
422 error_setg(errp
, "'DIMM property " PC_DIMM_NODE_PROP
" has value %"
423 PRIu32
"' which exceeds the number of numa nodes: %d",
424 dimm
->node
, nb_numa_nodes
? nb_numa_nodes
: 1);
429 static MemoryRegion
*pc_dimm_get_memory_region(PCDIMMDevice
*dimm
)
431 return host_memory_backend_get_memory(dimm
->hostmem
, &error_abort
);
434 static void pc_dimm_class_init(ObjectClass
*oc
, void *data
)
436 DeviceClass
*dc
= DEVICE_CLASS(oc
);
437 PCDIMMDeviceClass
*ddc
= PC_DIMM_CLASS(oc
);
439 dc
->realize
= pc_dimm_realize
;
440 dc
->props
= pc_dimm_properties
;
441 dc
->desc
= "DIMM memory module";
443 ddc
->get_memory_region
= pc_dimm_get_memory_region
;
446 static TypeInfo pc_dimm_info
= {
447 .name
= TYPE_PC_DIMM
,
448 .parent
= TYPE_DEVICE
,
449 .instance_size
= sizeof(PCDIMMDevice
),
450 .instance_init
= pc_dimm_init
,
451 .class_init
= pc_dimm_class_init
,
452 .class_size
= sizeof(PCDIMMDeviceClass
),
455 static void pc_dimm_register_types(void)
457 type_register_static(&pc_dimm_info
);
460 type_init(pc_dimm_register_types
)