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 "qemu/config-file.h"
24 #include "qapi/visitor.h"
25 #include "qemu/range.h"
26 #include "sysemu/numa.h"
27 #include "sysemu/kvm.h"
29 #include "hw/virtio/vhost.h"
31 typedef struct pc_dimms_capacity
{
36 void pc_dimm_memory_plug(DeviceState
*dev
, MemoryHotplugState
*hpms
,
37 MemoryRegion
*mr
, uint64_t align
, Error
**errp
)
40 MachineState
*machine
= MACHINE(qdev_get_machine());
41 PCDIMMDevice
*dimm
= PC_DIMM(dev
);
42 Error
*local_err
= NULL
;
43 uint64_t existing_dimms_capacity
= 0;
46 addr
= object_property_get_int(OBJECT(dimm
), PC_DIMM_ADDR_PROP
, &local_err
);
51 addr
= pc_dimm_get_free_addr(hpms
->base
,
52 memory_region_size(&hpms
->mr
),
53 !addr
? NULL
: &addr
, align
,
54 memory_region_size(mr
), &local_err
);
59 existing_dimms_capacity
= pc_existing_dimms_capacity(&local_err
);
64 if (existing_dimms_capacity
+ memory_region_size(mr
) >
65 machine
->maxram_size
- machine
->ram_size
) {
66 error_setg(&local_err
, "not enough space, currently 0x%" PRIx64
67 " in use of total hot pluggable 0x" RAM_ADDR_FMT
,
68 existing_dimms_capacity
,
69 machine
->maxram_size
- machine
->ram_size
);
73 object_property_set_int(OBJECT(dev
), addr
, PC_DIMM_ADDR_PROP
, &local_err
);
77 trace_mhp_pc_dimm_assigned_address(addr
);
79 slot
= object_property_get_int(OBJECT(dev
), PC_DIMM_SLOT_PROP
, &local_err
);
84 slot
= pc_dimm_get_free_slot(slot
== PC_DIMM_UNASSIGNED_SLOT
? NULL
: &slot
,
85 machine
->ram_slots
, &local_err
);
89 object_property_set_int(OBJECT(dev
), slot
, PC_DIMM_SLOT_PROP
, &local_err
);
93 trace_mhp_pc_dimm_assigned_slot(slot
);
95 if (kvm_enabled() && !kvm_has_free_slot(machine
)) {
96 error_setg(&local_err
, "hypervisor has no free memory slots left");
100 if (!vhost_has_free_slot()) {
101 error_setg(&local_err
, "a used vhost backend has no free"
102 " memory slots left");
106 memory_region_add_subregion(&hpms
->mr
, addr
- hpms
->base
, mr
);
107 vmstate_register_ram(mr
, dev
);
108 numa_set_mem_node_id(addr
, memory_region_size(mr
), dimm
->node
);
111 error_propagate(errp
, local_err
);
114 void pc_dimm_memory_unplug(DeviceState
*dev
, MemoryHotplugState
*hpms
,
117 PCDIMMDevice
*dimm
= PC_DIMM(dev
);
119 numa_unset_mem_node_id(dimm
->addr
, memory_region_size(mr
), dimm
->node
);
120 memory_region_del_subregion(&hpms
->mr
, mr
);
121 vmstate_unregister_ram(mr
, dev
);
124 static int pc_existing_dimms_capacity_internal(Object
*obj
, void *opaque
)
126 pc_dimms_capacity
*cap
= opaque
;
127 uint64_t *size
= &cap
->size
;
129 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
130 DeviceState
*dev
= DEVICE(obj
);
133 (*size
) += object_property_get_int(obj
, PC_DIMM_SIZE_PROP
,
137 if (cap
->errp
&& *cap
->errp
) {
141 object_child_foreach(obj
, pc_existing_dimms_capacity_internal
, opaque
);
145 uint64_t pc_existing_dimms_capacity(Error
**errp
)
147 pc_dimms_capacity cap
;
152 pc_existing_dimms_capacity_internal(qdev_get_machine(), &cap
);
156 int qmp_pc_dimm_device_list(Object
*obj
, void *opaque
)
158 MemoryDeviceInfoList
***prev
= opaque
;
160 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
161 DeviceState
*dev
= DEVICE(obj
);
164 MemoryDeviceInfoList
*elem
= g_new0(MemoryDeviceInfoList
, 1);
165 MemoryDeviceInfo
*info
= g_new0(MemoryDeviceInfo
, 1);
166 PCDIMMDeviceInfo
*di
= g_new0(PCDIMMDeviceInfo
, 1);
167 DeviceClass
*dc
= DEVICE_GET_CLASS(obj
);
168 PCDIMMDevice
*dimm
= PC_DIMM(obj
);
172 di
->id
= g_strdup(dev
->id
);
174 di
->hotplugged
= dev
->hotplugged
;
175 di
->hotpluggable
= dc
->hotpluggable
;
176 di
->addr
= dimm
->addr
;
177 di
->slot
= dimm
->slot
;
178 di
->node
= dimm
->node
;
179 di
->size
= object_property_get_int(OBJECT(dimm
), PC_DIMM_SIZE_PROP
,
181 di
->memdev
= object_get_canonical_path(OBJECT(dimm
->hostmem
));
183 info
->u
.dimm
.data
= di
;
191 object_child_foreach(obj
, qmp_pc_dimm_device_list
, opaque
);
195 static int pc_dimm_slot2bitmap(Object
*obj
, void *opaque
)
197 unsigned long *bitmap
= opaque
;
199 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
200 DeviceState
*dev
= DEVICE(obj
);
201 if (dev
->realized
) { /* count only realized DIMMs */
202 PCDIMMDevice
*d
= PC_DIMM(obj
);
203 set_bit(d
->slot
, bitmap
);
207 object_child_foreach(obj
, pc_dimm_slot2bitmap
, opaque
);
211 int pc_dimm_get_free_slot(const int *hint
, int max_slots
, Error
**errp
)
213 unsigned long *bitmap
= bitmap_new(max_slots
);
216 object_child_foreach(qdev_get_machine(), pc_dimm_slot2bitmap
, bitmap
);
218 /* check if requested slot is not occupied */
220 if (*hint
>= max_slots
) {
221 error_setg(errp
, "invalid slot# %d, should be less than %d",
223 } else if (!test_bit(*hint
, bitmap
)) {
226 error_setg(errp
, "slot %d is busy", *hint
);
231 /* search for free slot */
232 slot
= find_first_zero_bit(bitmap
, max_slots
);
233 if (slot
== max_slots
) {
234 error_setg(errp
, "no free slots available");
241 static gint
pc_dimm_addr_sort(gconstpointer a
, gconstpointer b
)
243 PCDIMMDevice
*x
= PC_DIMM(a
);
244 PCDIMMDevice
*y
= PC_DIMM(b
);
245 Int128 diff
= int128_sub(int128_make64(x
->addr
), int128_make64(y
->addr
));
247 if (int128_lt(diff
, int128_zero())) {
249 } else if (int128_gt(diff
, int128_zero())) {
255 static int pc_dimm_built_list(Object
*obj
, void *opaque
)
257 GSList
**list
= opaque
;
259 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
260 DeviceState
*dev
= DEVICE(obj
);
261 if (dev
->realized
) { /* only realized DIMMs matter */
262 *list
= g_slist_insert_sorted(*list
, dev
, pc_dimm_addr_sort
);
266 object_child_foreach(obj
, pc_dimm_built_list
, opaque
);
270 uint64_t pc_dimm_get_free_addr(uint64_t address_space_start
,
271 uint64_t address_space_size
,
272 uint64_t *hint
, uint64_t align
, uint64_t size
,
275 GSList
*list
= NULL
, *item
;
276 uint64_t new_addr
, ret
= 0;
277 uint64_t address_space_end
= address_space_start
+ address_space_size
;
279 g_assert(QEMU_ALIGN_UP(address_space_start
, align
) == address_space_start
);
281 if (!address_space_size
) {
282 error_setg(errp
, "memory hotplug is not enabled, "
283 "please add maxmem option");
287 if (hint
&& QEMU_ALIGN_UP(*hint
, align
) != *hint
) {
288 error_setg(errp
, "address must be aligned to 0x%" PRIx64
" bytes",
293 if (QEMU_ALIGN_UP(size
, align
) != size
) {
294 error_setg(errp
, "backend memory size must be multiple of 0x%"
299 assert(address_space_end
> address_space_start
);
300 object_child_foreach(qdev_get_machine(), pc_dimm_built_list
, &list
);
305 new_addr
= address_space_start
;
308 /* find address range that will fit new DIMM */
309 for (item
= list
; item
; item
= g_slist_next(item
)) {
310 PCDIMMDevice
*dimm
= item
->data
;
311 uint64_t dimm_size
= object_property_get_int(OBJECT(dimm
),
318 if (ranges_overlap(dimm
->addr
, dimm_size
, new_addr
, size
)) {
320 DeviceState
*d
= DEVICE(dimm
);
321 error_setg(errp
, "address range conflicts with '%s'", d
->id
);
324 new_addr
= QEMU_ALIGN_UP(dimm
->addr
+ dimm_size
, align
);
329 if (new_addr
< address_space_start
) {
330 error_setg(errp
, "can't add memory [0x%" PRIx64
":0x%" PRIx64
331 "] at 0x%" PRIx64
, new_addr
, size
, address_space_start
);
332 } else if ((new_addr
+ size
) > address_space_end
) {
333 error_setg(errp
, "can't add memory [0x%" PRIx64
":0x%" PRIx64
334 "] beyond 0x%" PRIx64
, new_addr
, size
, address_space_end
);
342 static Property pc_dimm_properties
[] = {
343 DEFINE_PROP_UINT64(PC_DIMM_ADDR_PROP
, PCDIMMDevice
, addr
, 0),
344 DEFINE_PROP_UINT32(PC_DIMM_NODE_PROP
, PCDIMMDevice
, node
, 0),
345 DEFINE_PROP_INT32(PC_DIMM_SLOT_PROP
, PCDIMMDevice
, slot
,
346 PC_DIMM_UNASSIGNED_SLOT
),
347 DEFINE_PROP_END_OF_LIST(),
350 static void pc_dimm_get_size(Object
*obj
, Visitor
*v
, const char *name
,
351 void *opaque
, Error
**errp
)
355 PCDIMMDevice
*dimm
= PC_DIMM(obj
);
357 mr
= host_memory_backend_get_memory(dimm
->hostmem
, errp
);
358 value
= memory_region_size(mr
);
360 visit_type_int(v
, name
, &value
, errp
);
363 static void pc_dimm_check_memdev_is_busy(Object
*obj
, const char *name
,
364 Object
*val
, Error
**errp
)
367 Error
*local_err
= NULL
;
369 mr
= host_memory_backend_get_memory(MEMORY_BACKEND(val
), &local_err
);
373 if (memory_region_is_mapped(mr
)) {
374 char *path
= object_get_canonical_path_component(val
);
375 error_setg(&local_err
, "can't use already busy memdev: %s", path
);
378 qdev_prop_allow_set_link_before_realize(obj
, name
, val
, &local_err
);
382 error_propagate(errp
, local_err
);
385 static void pc_dimm_init(Object
*obj
)
387 PCDIMMDevice
*dimm
= PC_DIMM(obj
);
389 object_property_add(obj
, PC_DIMM_SIZE_PROP
, "int", pc_dimm_get_size
,
390 NULL
, NULL
, NULL
, &error_abort
);
391 object_property_add_link(obj
, PC_DIMM_MEMDEV_PROP
, TYPE_MEMORY_BACKEND
,
392 (Object
**)&dimm
->hostmem
,
393 pc_dimm_check_memdev_is_busy
,
394 OBJ_PROP_LINK_UNREF_ON_RELEASE
,
398 static void pc_dimm_realize(DeviceState
*dev
, Error
**errp
)
400 PCDIMMDevice
*dimm
= PC_DIMM(dev
);
402 if (!dimm
->hostmem
) {
403 error_setg(errp
, "'" PC_DIMM_MEMDEV_PROP
"' property is not set");
406 if (((nb_numa_nodes
> 0) && (dimm
->node
>= nb_numa_nodes
)) ||
407 (!nb_numa_nodes
&& dimm
->node
)) {
408 error_setg(errp
, "'DIMM property " PC_DIMM_NODE_PROP
" has value %"
409 PRIu32
"' which exceeds the number of numa nodes: %d",
410 dimm
->node
, nb_numa_nodes
? nb_numa_nodes
: 1);
415 static MemoryRegion
*pc_dimm_get_memory_region(PCDIMMDevice
*dimm
)
417 return host_memory_backend_get_memory(dimm
->hostmem
, &error_abort
);
420 static void pc_dimm_class_init(ObjectClass
*oc
, void *data
)
422 DeviceClass
*dc
= DEVICE_CLASS(oc
);
423 PCDIMMDeviceClass
*ddc
= PC_DIMM_CLASS(oc
);
425 dc
->realize
= pc_dimm_realize
;
426 dc
->props
= pc_dimm_properties
;
427 dc
->desc
= "DIMM memory module";
429 ddc
->get_memory_region
= pc_dimm_get_memory_region
;
432 static TypeInfo pc_dimm_info
= {
433 .name
= TYPE_PC_DIMM
,
434 .parent
= TYPE_DEVICE
,
435 .instance_size
= sizeof(PCDIMMDevice
),
436 .instance_init
= pc_dimm_init
,
437 .class_init
= pc_dimm_class_init
,
438 .class_size
= sizeof(PCDIMMDeviceClass
),
441 static void pc_dimm_register_types(void)
443 type_register_static(&pc_dimm_info
);
446 type_init(pc_dimm_register_types
)