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"
27 typedef struct pc_dimms_capacity
{
32 static int pc_existing_dimms_capacity_internal(Object
*obj
, void *opaque
)
34 pc_dimms_capacity
*cap
= opaque
;
35 uint64_t *size
= &cap
->size
;
37 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
38 DeviceState
*dev
= DEVICE(obj
);
41 (*size
) += object_property_get_int(obj
, PC_DIMM_SIZE_PROP
,
45 if (cap
->errp
&& *cap
->errp
) {
49 object_child_foreach(obj
, pc_existing_dimms_capacity_internal
, opaque
);
53 uint64_t pc_existing_dimms_capacity(Error
**errp
)
55 pc_dimms_capacity cap
;
60 pc_existing_dimms_capacity_internal(qdev_get_machine(), &cap
);
64 int qmp_pc_dimm_device_list(Object
*obj
, void *opaque
)
66 MemoryDeviceInfoList
***prev
= opaque
;
68 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
69 DeviceState
*dev
= DEVICE(obj
);
72 MemoryDeviceInfoList
*elem
= g_new0(MemoryDeviceInfoList
, 1);
73 MemoryDeviceInfo
*info
= g_new0(MemoryDeviceInfo
, 1);
74 PCDIMMDeviceInfo
*di
= g_new0(PCDIMMDeviceInfo
, 1);
75 DeviceClass
*dc
= DEVICE_GET_CLASS(obj
);
76 PCDIMMDevice
*dimm
= PC_DIMM(obj
);
80 di
->id
= g_strdup(dev
->id
);
82 di
->hotplugged
= dev
->hotplugged
;
83 di
->hotpluggable
= dc
->hotpluggable
;
84 di
->addr
= dimm
->addr
;
85 di
->slot
= dimm
->slot
;
86 di
->node
= dimm
->node
;
87 di
->size
= object_property_get_int(OBJECT(dimm
), PC_DIMM_SIZE_PROP
,
89 di
->memdev
= object_get_canonical_path(OBJECT(dimm
->hostmem
));
99 object_child_foreach(obj
, qmp_pc_dimm_device_list
, opaque
);
103 static int pc_dimm_slot2bitmap(Object
*obj
, void *opaque
)
105 unsigned long *bitmap
= opaque
;
107 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
108 DeviceState
*dev
= DEVICE(obj
);
109 if (dev
->realized
) { /* count only realized DIMMs */
110 PCDIMMDevice
*d
= PC_DIMM(obj
);
111 set_bit(d
->slot
, bitmap
);
115 object_child_foreach(obj
, pc_dimm_slot2bitmap
, opaque
);
119 int pc_dimm_get_free_slot(const int *hint
, int max_slots
, Error
**errp
)
121 unsigned long *bitmap
= bitmap_new(max_slots
);
124 object_child_foreach(qdev_get_machine(), pc_dimm_slot2bitmap
, bitmap
);
126 /* check if requested slot is not occupied */
128 if (*hint
>= max_slots
) {
129 error_setg(errp
, "invalid slot# %d, should be less than %d",
131 } else if (!test_bit(*hint
, bitmap
)) {
134 error_setg(errp
, "slot %d is busy", *hint
);
139 /* search for free slot */
140 slot
= find_first_zero_bit(bitmap
, max_slots
);
141 if (slot
== max_slots
) {
142 error_setg(errp
, "no free slots available");
149 static gint
pc_dimm_addr_sort(gconstpointer a
, gconstpointer b
)
151 PCDIMMDevice
*x
= PC_DIMM(a
);
152 PCDIMMDevice
*y
= PC_DIMM(b
);
153 Int128 diff
= int128_sub(int128_make64(x
->addr
), int128_make64(y
->addr
));
155 if (int128_lt(diff
, int128_zero())) {
157 } else if (int128_gt(diff
, int128_zero())) {
163 static int pc_dimm_built_list(Object
*obj
, void *opaque
)
165 GSList
**list
= opaque
;
167 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
168 DeviceState
*dev
= DEVICE(obj
);
169 if (dev
->realized
) { /* only realized DIMMs matter */
170 *list
= g_slist_insert_sorted(*list
, dev
, pc_dimm_addr_sort
);
174 object_child_foreach(obj
, pc_dimm_built_list
, opaque
);
178 uint64_t pc_dimm_get_free_addr(uint64_t address_space_start
,
179 uint64_t address_space_size
,
180 uint64_t *hint
, uint64_t align
, uint64_t size
,
183 GSList
*list
= NULL
, *item
;
184 uint64_t new_addr
, ret
= 0;
185 uint64_t address_space_end
= address_space_start
+ address_space_size
;
187 g_assert(QEMU_ALIGN_UP(address_space_start
, align
) == address_space_start
);
188 g_assert(QEMU_ALIGN_UP(address_space_size
, align
) == address_space_size
);
190 if (!address_space_size
) {
191 error_setg(errp
, "memory hotplug is not enabled, "
192 "please add maxmem option");
196 if (hint
&& QEMU_ALIGN_UP(*hint
, align
) != *hint
) {
197 error_setg(errp
, "address must be aligned to 0x%" PRIx64
" bytes",
202 if (QEMU_ALIGN_UP(size
, align
) != size
) {
203 error_setg(errp
, "backend memory size must be multiple of 0x%"
208 assert(address_space_end
> address_space_start
);
209 object_child_foreach(qdev_get_machine(), pc_dimm_built_list
, &list
);
214 new_addr
= address_space_start
;
217 /* find address range that will fit new DIMM */
218 for (item
= list
; item
; item
= g_slist_next(item
)) {
219 PCDIMMDevice
*dimm
= item
->data
;
220 uint64_t dimm_size
= object_property_get_int(OBJECT(dimm
),
227 if (ranges_overlap(dimm
->addr
, dimm_size
, new_addr
, size
)) {
229 DeviceState
*d
= DEVICE(dimm
);
230 error_setg(errp
, "address range conflicts with '%s'", d
->id
);
233 new_addr
= QEMU_ALIGN_UP(dimm
->addr
+ dimm_size
, align
);
238 if (new_addr
< address_space_start
) {
239 error_setg(errp
, "can't add memory [0x%" PRIx64
":0x%" PRIx64
240 "] at 0x%" PRIx64
, new_addr
, size
, address_space_start
);
241 } else if ((new_addr
+ size
) > address_space_end
) {
242 error_setg(errp
, "can't add memory [0x%" PRIx64
":0x%" PRIx64
243 "] beyond 0x%" PRIx64
, new_addr
, size
, address_space_end
);
251 static Property pc_dimm_properties
[] = {
252 DEFINE_PROP_UINT64(PC_DIMM_ADDR_PROP
, PCDIMMDevice
, addr
, 0),
253 DEFINE_PROP_UINT32(PC_DIMM_NODE_PROP
, PCDIMMDevice
, node
, 0),
254 DEFINE_PROP_INT32(PC_DIMM_SLOT_PROP
, PCDIMMDevice
, slot
,
255 PC_DIMM_UNASSIGNED_SLOT
),
256 DEFINE_PROP_END_OF_LIST(),
259 static void pc_dimm_get_size(Object
*obj
, Visitor
*v
, void *opaque
,
260 const char *name
, Error
**errp
)
264 PCDIMMDevice
*dimm
= PC_DIMM(obj
);
266 mr
= host_memory_backend_get_memory(dimm
->hostmem
, errp
);
267 value
= memory_region_size(mr
);
269 visit_type_int(v
, &value
, name
, errp
);
272 static void pc_dimm_check_memdev_is_busy(Object
*obj
, const char *name
,
273 Object
*val
, Error
**errp
)
277 mr
= host_memory_backend_get_memory(MEMORY_BACKEND(val
), errp
);
278 if (memory_region_is_mapped(mr
)) {
279 char *path
= object_get_canonical_path_component(val
);
280 error_setg(errp
, "can't use already busy memdev: %s", path
);
283 qdev_prop_allow_set_link_before_realize(obj
, name
, val
, errp
);
287 static void pc_dimm_init(Object
*obj
)
289 PCDIMMDevice
*dimm
= PC_DIMM(obj
);
291 object_property_add(obj
, PC_DIMM_SIZE_PROP
, "int", pc_dimm_get_size
,
292 NULL
, NULL
, NULL
, &error_abort
);
293 object_property_add_link(obj
, PC_DIMM_MEMDEV_PROP
, TYPE_MEMORY_BACKEND
,
294 (Object
**)&dimm
->hostmem
,
295 pc_dimm_check_memdev_is_busy
,
296 OBJ_PROP_LINK_UNREF_ON_RELEASE
,
300 static void pc_dimm_realize(DeviceState
*dev
, Error
**errp
)
302 PCDIMMDevice
*dimm
= PC_DIMM(dev
);
304 if (!dimm
->hostmem
) {
305 error_setg(errp
, "'" PC_DIMM_MEMDEV_PROP
"' property is not set");
308 if ((nb_numa_nodes
> 0) && (dimm
->node
>= nb_numa_nodes
)) {
309 error_setg(errp
, "'DIMM property " PC_DIMM_NODE_PROP
" has value %"
310 PRIu32
"' which exceeds the number of numa nodes: %d",
311 dimm
->node
, nb_numa_nodes
);
316 static MemoryRegion
*pc_dimm_get_memory_region(PCDIMMDevice
*dimm
)
318 return host_memory_backend_get_memory(dimm
->hostmem
, &error_abort
);
321 static void pc_dimm_class_init(ObjectClass
*oc
, void *data
)
323 DeviceClass
*dc
= DEVICE_CLASS(oc
);
324 PCDIMMDeviceClass
*ddc
= PC_DIMM_CLASS(oc
);
326 dc
->realize
= pc_dimm_realize
;
327 dc
->props
= pc_dimm_properties
;
329 ddc
->get_memory_region
= pc_dimm_get_memory_region
;
332 static TypeInfo pc_dimm_info
= {
333 .name
= TYPE_PC_DIMM
,
334 .parent
= TYPE_DEVICE
,
335 .instance_size
= sizeof(PCDIMMDevice
),
336 .instance_init
= pc_dimm_init
,
337 .class_init
= pc_dimm_class_init
,
338 .class_size
= sizeof(PCDIMMDeviceClass
),
341 static void pc_dimm_register_types(void)
343 type_register_static(&pc_dimm_info
);
346 type_init(pc_dimm_register_types
)