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"
26 typedef struct pc_dimms_capacity
{
31 static int pc_existing_dimms_capacity_internal(Object
*obj
, void *opaque
)
33 pc_dimms_capacity
*cap
= opaque
;
34 uint64_t *size
= &cap
->size
;
36 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
37 DeviceState
*dev
= DEVICE(obj
);
40 (*size
) += object_property_get_int(obj
, PC_DIMM_SIZE_PROP
,
44 if (cap
->errp
&& *cap
->errp
) {
48 object_child_foreach(obj
, pc_existing_dimms_capacity_internal
, opaque
);
52 uint64_t pc_existing_dimms_capacity(Error
**errp
)
54 pc_dimms_capacity cap
;
59 pc_existing_dimms_capacity_internal(qdev_get_machine(), &cap
);
63 int qmp_pc_dimm_device_list(Object
*obj
, void *opaque
)
65 MemoryDeviceInfoList
***prev
= opaque
;
67 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
68 DeviceState
*dev
= DEVICE(obj
);
71 MemoryDeviceInfoList
*elem
= g_new0(MemoryDeviceInfoList
, 1);
72 MemoryDeviceInfo
*info
= g_new0(MemoryDeviceInfo
, 1);
73 PCDIMMDeviceInfo
*di
= g_new0(PCDIMMDeviceInfo
, 1);
74 DeviceClass
*dc
= DEVICE_GET_CLASS(obj
);
75 PCDIMMDevice
*dimm
= PC_DIMM(obj
);
79 di
->id
= g_strdup(dev
->id
);
81 di
->hotplugged
= dev
->hotplugged
;
82 di
->hotpluggable
= dc
->hotpluggable
;
83 di
->addr
= dimm
->addr
;
84 di
->slot
= dimm
->slot
;
85 di
->node
= dimm
->node
;
86 di
->size
= object_property_get_int(OBJECT(dimm
), PC_DIMM_SIZE_PROP
,
88 di
->memdev
= object_get_canonical_path(OBJECT(dimm
->hostmem
));
98 object_child_foreach(obj
, qmp_pc_dimm_device_list
, opaque
);
102 static int pc_dimm_slot2bitmap(Object
*obj
, void *opaque
)
104 unsigned long *bitmap
= opaque
;
106 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
107 DeviceState
*dev
= DEVICE(obj
);
108 if (dev
->realized
) { /* count only realized DIMMs */
109 PCDIMMDevice
*d
= PC_DIMM(obj
);
110 set_bit(d
->slot
, bitmap
);
114 object_child_foreach(obj
, pc_dimm_slot2bitmap
, opaque
);
118 int pc_dimm_get_free_slot(const int *hint
, int max_slots
, Error
**errp
)
120 unsigned long *bitmap
= bitmap_new(max_slots
);
123 object_child_foreach(qdev_get_machine(), pc_dimm_slot2bitmap
, bitmap
);
125 /* check if requested slot is not occupied */
127 if (*hint
>= max_slots
) {
128 error_setg(errp
, "invalid slot# %d, should be less than %d",
130 } else if (!test_bit(*hint
, bitmap
)) {
133 error_setg(errp
, "slot %d is busy", *hint
);
138 /* search for free slot */
139 slot
= find_first_zero_bit(bitmap
, max_slots
);
140 if (slot
== max_slots
) {
141 error_setg(errp
, "no free slots available");
148 static gint
pc_dimm_addr_sort(gconstpointer a
, gconstpointer b
)
150 PCDIMMDevice
*x
= PC_DIMM(a
);
151 PCDIMMDevice
*y
= PC_DIMM(b
);
152 Int128 diff
= int128_sub(int128_make64(x
->addr
), int128_make64(y
->addr
));
154 if (int128_lt(diff
, int128_zero())) {
156 } else if (int128_gt(diff
, int128_zero())) {
162 static int pc_dimm_built_list(Object
*obj
, void *opaque
)
164 GSList
**list
= opaque
;
166 if (object_dynamic_cast(obj
, TYPE_PC_DIMM
)) {
167 DeviceState
*dev
= DEVICE(obj
);
168 if (dev
->realized
) { /* only realized DIMMs matter */
169 *list
= g_slist_insert_sorted(*list
, dev
, pc_dimm_addr_sort
);
173 object_child_foreach(obj
, pc_dimm_built_list
, opaque
);
177 uint64_t pc_dimm_get_free_addr(uint64_t address_space_start
,
178 uint64_t address_space_size
,
179 uint64_t *hint
, uint64_t align
, uint64_t size
,
182 GSList
*list
= NULL
, *item
;
183 uint64_t new_addr
, ret
= 0;
184 uint64_t address_space_end
= address_space_start
+ address_space_size
;
186 g_assert(QEMU_ALIGN_UP(address_space_start
, align
) == address_space_start
);
187 g_assert(QEMU_ALIGN_UP(address_space_size
, align
) == address_space_size
);
189 if (!address_space_size
) {
190 error_setg(errp
, "memory hotplug is not enabled, "
191 "please add maxmem option");
195 if (hint
&& QEMU_ALIGN_UP(*hint
, align
) != *hint
) {
196 error_setg(errp
, "address must be aligned to 0x%" PRIx64
" bytes",
201 if (QEMU_ALIGN_UP(size
, align
) != size
) {
202 error_setg(errp
, "backend memory size must be multiple of 0x%"
207 assert(address_space_end
> address_space_start
);
208 object_child_foreach(qdev_get_machine(), pc_dimm_built_list
, &list
);
213 new_addr
= address_space_start
;
216 /* find address range that will fit new DIMM */
217 for (item
= list
; item
; item
= g_slist_next(item
)) {
218 PCDIMMDevice
*dimm
= item
->data
;
219 uint64_t dimm_size
= object_property_get_int(OBJECT(dimm
),
226 if (ranges_overlap(dimm
->addr
, dimm_size
, new_addr
, size
)) {
228 DeviceState
*d
= DEVICE(dimm
);
229 error_setg(errp
, "address range conflicts with '%s'", d
->id
);
232 new_addr
= QEMU_ALIGN_UP(dimm
->addr
+ dimm_size
, align
);
237 if (new_addr
< address_space_start
) {
238 error_setg(errp
, "can't add memory [0x%" PRIx64
":0x%" PRIx64
239 "] at 0x%" PRIx64
, new_addr
, size
, address_space_start
);
240 } else if ((new_addr
+ size
) > address_space_end
) {
241 error_setg(errp
, "can't add memory [0x%" PRIx64
":0x%" PRIx64
242 "] beyond 0x%" PRIx64
, new_addr
, size
, address_space_end
);
250 static Property pc_dimm_properties
[] = {
251 DEFINE_PROP_UINT64(PC_DIMM_ADDR_PROP
, PCDIMMDevice
, addr
, 0),
252 DEFINE_PROP_UINT32(PC_DIMM_NODE_PROP
, PCDIMMDevice
, node
, 0),
253 DEFINE_PROP_INT32(PC_DIMM_SLOT_PROP
, PCDIMMDevice
, slot
,
254 PC_DIMM_UNASSIGNED_SLOT
),
255 DEFINE_PROP_END_OF_LIST(),
258 static void pc_dimm_get_size(Object
*obj
, Visitor
*v
, void *opaque
,
259 const char *name
, Error
**errp
)
263 PCDIMMDevice
*dimm
= PC_DIMM(obj
);
265 mr
= host_memory_backend_get_memory(dimm
->hostmem
, errp
);
266 value
= memory_region_size(mr
);
268 visit_type_int(v
, &value
, name
, errp
);
271 static void pc_dimm_check_memdev_is_busy(Object
*obj
, const char *name
,
272 Object
*val
, Error
**errp
)
276 mr
= host_memory_backend_get_memory(MEMORY_BACKEND(val
), errp
);
277 if (memory_region_is_mapped(mr
)) {
278 char *path
= object_get_canonical_path_component(val
);
279 error_setg(errp
, "can't use already busy memdev: %s", path
);
282 qdev_prop_allow_set_link_before_realize(obj
, name
, val
, errp
);
286 static void pc_dimm_init(Object
*obj
)
288 PCDIMMDevice
*dimm
= PC_DIMM(obj
);
290 object_property_add(obj
, PC_DIMM_SIZE_PROP
, "int", pc_dimm_get_size
,
291 NULL
, NULL
, NULL
, &error_abort
);
292 object_property_add_link(obj
, PC_DIMM_MEMDEV_PROP
, TYPE_MEMORY_BACKEND
,
293 (Object
**)&dimm
->hostmem
,
294 pc_dimm_check_memdev_is_busy
,
295 OBJ_PROP_LINK_UNREF_ON_RELEASE
,
299 static void pc_dimm_realize(DeviceState
*dev
, Error
**errp
)
301 PCDIMMDevice
*dimm
= PC_DIMM(dev
);
303 if (!dimm
->hostmem
) {
304 error_setg(errp
, "'" PC_DIMM_MEMDEV_PROP
"' property is not set");
307 if ((nb_numa_nodes
> 0) && (dimm
->node
>= nb_numa_nodes
)) {
308 error_setg(errp
, "'DIMM property " PC_DIMM_NODE_PROP
" has value %"
309 PRIu32
"' which exceeds the number of numa nodes: %d",
310 dimm
->node
, nb_numa_nodes
);
315 static MemoryRegion
*pc_dimm_get_memory_region(PCDIMMDevice
*dimm
)
317 return host_memory_backend_get_memory(dimm
->hostmem
, &error_abort
);
320 static void pc_dimm_class_init(ObjectClass
*oc
, void *data
)
322 DeviceClass
*dc
= DEVICE_CLASS(oc
);
323 PCDIMMDeviceClass
*ddc
= PC_DIMM_CLASS(oc
);
325 dc
->realize
= pc_dimm_realize
;
326 dc
->props
= pc_dimm_properties
;
328 ddc
->get_memory_region
= pc_dimm_get_memory_region
;
331 static TypeInfo pc_dimm_info
= {
332 .name
= TYPE_PC_DIMM
,
333 .parent
= TYPE_DEVICE
,
334 .instance_size
= sizeof(PCDIMMDevice
),
335 .instance_init
= pc_dimm_init
,
336 .class_init
= pc_dimm_class_init
,
337 .class_size
= sizeof(PCDIMMDeviceClass
),
340 static void pc_dimm_register_types(void)
342 type_register_static(&pc_dimm_info
);
345 type_init(pc_dimm_register_types
)