1 | /* |
2 | * Dimm device for Memory Hotplug |
3 | * |
4 | * Copyright ProfitBricks GmbH 2012 |
5 | * Copyright (C) 2014 Red Hat Inc |
6 | * |
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. |
11 | * |
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. |
16 | * |
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/> |
19 | */ |
20 | |
21 | #include "qemu/osdep.h" |
22 | #include "hw/boards.h" |
23 | #include "hw/mem/pc-dimm.h" |
24 | #include "hw/qdev-properties.h" |
25 | #include "migration/vmstate.h" |
26 | #include "hw/mem/nvdimm.h" |
27 | #include "hw/mem/memory-device.h" |
28 | #include "qapi/error.h" |
29 | #include "qapi/visitor.h" |
30 | #include "qemu/module.h" |
31 | #include "sysemu/hostmem.h" |
32 | #include "sysemu/numa.h" |
33 | #include "trace.h" |
34 | |
35 | static int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp); |
36 | |
37 | void pc_dimm_pre_plug(PCDIMMDevice *dimm, MachineState *machine, |
38 | const uint64_t *legacy_align, Error **errp) |
39 | { |
40 | Error *local_err = NULL; |
41 | int slot; |
42 | |
43 | slot = object_property_get_int(OBJECT(dimm), PC_DIMM_SLOT_PROP, |
44 | &error_abort); |
45 | if ((slot < 0 || slot >= machine->ram_slots) && |
46 | slot != PC_DIMM_UNASSIGNED_SLOT) { |
47 | error_setg(&local_err, "invalid slot number, valid range is [0-%" |
48 | PRIu64 "]" , machine->ram_slots - 1); |
49 | goto out; |
50 | } |
51 | |
52 | slot = pc_dimm_get_free_slot(slot == PC_DIMM_UNASSIGNED_SLOT ? NULL : &slot, |
53 | machine->ram_slots, &local_err); |
54 | if (local_err) { |
55 | goto out; |
56 | } |
57 | object_property_set_int(OBJECT(dimm), slot, PC_DIMM_SLOT_PROP, |
58 | &error_abort); |
59 | trace_mhp_pc_dimm_assigned_slot(slot); |
60 | |
61 | memory_device_pre_plug(MEMORY_DEVICE(dimm), machine, legacy_align, |
62 | &local_err); |
63 | out: |
64 | error_propagate(errp, local_err); |
65 | } |
66 | |
67 | void pc_dimm_plug(PCDIMMDevice *dimm, MachineState *machine, Error **errp) |
68 | { |
69 | PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm); |
70 | MemoryRegion *vmstate_mr = ddc->get_vmstate_memory_region(dimm, |
71 | &error_abort); |
72 | |
73 | memory_device_plug(MEMORY_DEVICE(dimm), machine); |
74 | vmstate_register_ram(vmstate_mr, DEVICE(dimm)); |
75 | } |
76 | |
77 | void pc_dimm_unplug(PCDIMMDevice *dimm, MachineState *machine) |
78 | { |
79 | PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm); |
80 | MemoryRegion *vmstate_mr = ddc->get_vmstate_memory_region(dimm, |
81 | &error_abort); |
82 | |
83 | memory_device_unplug(MEMORY_DEVICE(dimm), machine); |
84 | vmstate_unregister_ram(vmstate_mr, DEVICE(dimm)); |
85 | } |
86 | |
87 | static int pc_dimm_slot2bitmap(Object *obj, void *opaque) |
88 | { |
89 | unsigned long *bitmap = opaque; |
90 | |
91 | if (object_dynamic_cast(obj, TYPE_PC_DIMM)) { |
92 | DeviceState *dev = DEVICE(obj); |
93 | if (dev->realized) { /* count only realized DIMMs */ |
94 | PCDIMMDevice *d = PC_DIMM(obj); |
95 | set_bit(d->slot, bitmap); |
96 | } |
97 | } |
98 | |
99 | object_child_foreach(obj, pc_dimm_slot2bitmap, opaque); |
100 | return 0; |
101 | } |
102 | |
103 | static int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp) |
104 | { |
105 | unsigned long *bitmap; |
106 | int slot = 0; |
107 | |
108 | if (max_slots <= 0) { |
109 | error_setg(errp, "no slots where allocated, please specify " |
110 | "the 'slots' option" ); |
111 | return slot; |
112 | } |
113 | |
114 | bitmap = bitmap_new(max_slots); |
115 | object_child_foreach(qdev_get_machine(), pc_dimm_slot2bitmap, bitmap); |
116 | |
117 | /* check if requested slot is not occupied */ |
118 | if (hint) { |
119 | if (*hint >= max_slots) { |
120 | error_setg(errp, "invalid slot# %d, should be less than %d" , |
121 | *hint, max_slots); |
122 | } else if (!test_bit(*hint, bitmap)) { |
123 | slot = *hint; |
124 | } else { |
125 | error_setg(errp, "slot %d is busy" , *hint); |
126 | } |
127 | goto out; |
128 | } |
129 | |
130 | /* search for free slot */ |
131 | slot = find_first_zero_bit(bitmap, max_slots); |
132 | if (slot == max_slots) { |
133 | error_setg(errp, "no free slots available" ); |
134 | } |
135 | out: |
136 | g_free(bitmap); |
137 | return slot; |
138 | } |
139 | |
140 | static Property pc_dimm_properties[] = { |
141 | DEFINE_PROP_UINT64(PC_DIMM_ADDR_PROP, PCDIMMDevice, addr, 0), |
142 | DEFINE_PROP_UINT32(PC_DIMM_NODE_PROP, PCDIMMDevice, node, 0), |
143 | DEFINE_PROP_INT32(PC_DIMM_SLOT_PROP, PCDIMMDevice, slot, |
144 | PC_DIMM_UNASSIGNED_SLOT), |
145 | DEFINE_PROP_LINK(PC_DIMM_MEMDEV_PROP, PCDIMMDevice, hostmem, |
146 | TYPE_MEMORY_BACKEND, HostMemoryBackend *), |
147 | DEFINE_PROP_END_OF_LIST(), |
148 | }; |
149 | |
150 | static void pc_dimm_get_size(Object *obj, Visitor *v, const char *name, |
151 | void *opaque, Error **errp) |
152 | { |
153 | Error *local_err = NULL; |
154 | uint64_t value; |
155 | |
156 | value = memory_device_get_region_size(MEMORY_DEVICE(obj), &local_err); |
157 | if (local_err) { |
158 | error_propagate(errp, local_err); |
159 | return; |
160 | } |
161 | |
162 | visit_type_uint64(v, name, &value, errp); |
163 | } |
164 | |
165 | static void pc_dimm_init(Object *obj) |
166 | { |
167 | object_property_add(obj, PC_DIMM_SIZE_PROP, "uint64" , pc_dimm_get_size, |
168 | NULL, NULL, NULL, &error_abort); |
169 | } |
170 | |
171 | static void pc_dimm_realize(DeviceState *dev, Error **errp) |
172 | { |
173 | PCDIMMDevice *dimm = PC_DIMM(dev); |
174 | PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm); |
175 | MachineState *ms = MACHINE(qdev_get_machine()); |
176 | int nb_numa_nodes = ms->numa_state->num_nodes; |
177 | |
178 | if (!dimm->hostmem) { |
179 | error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property is not set" ); |
180 | return; |
181 | } else if (host_memory_backend_is_mapped(dimm->hostmem)) { |
182 | char *path = object_get_canonical_path_component(OBJECT(dimm->hostmem)); |
183 | error_setg(errp, "can't use already busy memdev: %s" , path); |
184 | g_free(path); |
185 | return; |
186 | } |
187 | if (((nb_numa_nodes > 0) && (dimm->node >= nb_numa_nodes)) || |
188 | (!nb_numa_nodes && dimm->node)) { |
189 | error_setg(errp, "'DIMM property " PC_DIMM_NODE_PROP " has value %" |
190 | PRIu32 "' which exceeds the number of numa nodes: %d" , |
191 | dimm->node, nb_numa_nodes ? nb_numa_nodes : 1); |
192 | return; |
193 | } |
194 | |
195 | if (ddc->realize) { |
196 | ddc->realize(dimm, errp); |
197 | } |
198 | |
199 | host_memory_backend_set_mapped(dimm->hostmem, true); |
200 | } |
201 | |
202 | static void pc_dimm_unrealize(DeviceState *dev, Error **errp) |
203 | { |
204 | PCDIMMDevice *dimm = PC_DIMM(dev); |
205 | |
206 | host_memory_backend_set_mapped(dimm->hostmem, false); |
207 | } |
208 | |
209 | static MemoryRegion *pc_dimm_get_memory_region(PCDIMMDevice *dimm, Error **errp) |
210 | { |
211 | if (!dimm->hostmem) { |
212 | error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property must be set" ); |
213 | return NULL; |
214 | } |
215 | |
216 | return host_memory_backend_get_memory(dimm->hostmem); |
217 | } |
218 | |
219 | static uint64_t pc_dimm_md_get_addr(const MemoryDeviceState *md) |
220 | { |
221 | return object_property_get_uint(OBJECT(md), PC_DIMM_ADDR_PROP, &error_abort); |
222 | } |
223 | |
224 | static void pc_dimm_md_set_addr(MemoryDeviceState *md, uint64_t addr, |
225 | Error **errp) |
226 | { |
227 | object_property_set_uint(OBJECT(md), addr, PC_DIMM_ADDR_PROP, errp); |
228 | } |
229 | |
230 | static MemoryRegion *pc_dimm_md_get_memory_region(MemoryDeviceState *md, |
231 | Error **errp) |
232 | { |
233 | return pc_dimm_get_memory_region(PC_DIMM(md), errp); |
234 | } |
235 | |
236 | static void pc_dimm_md_fill_device_info(const MemoryDeviceState *md, |
237 | MemoryDeviceInfo *info) |
238 | { |
239 | PCDIMMDeviceInfo *di = g_new0(PCDIMMDeviceInfo, 1); |
240 | const DeviceClass *dc = DEVICE_GET_CLASS(md); |
241 | const PCDIMMDevice *dimm = PC_DIMM(md); |
242 | const DeviceState *dev = DEVICE(md); |
243 | |
244 | if (dev->id) { |
245 | di->has_id = true; |
246 | di->id = g_strdup(dev->id); |
247 | } |
248 | di->hotplugged = dev->hotplugged; |
249 | di->hotpluggable = dc->hotpluggable; |
250 | di->addr = dimm->addr; |
251 | di->slot = dimm->slot; |
252 | di->node = dimm->node; |
253 | di->size = object_property_get_uint(OBJECT(dimm), PC_DIMM_SIZE_PROP, |
254 | NULL); |
255 | di->memdev = object_get_canonical_path(OBJECT(dimm->hostmem)); |
256 | |
257 | if (object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM)) { |
258 | info->u.nvdimm.data = di; |
259 | info->type = MEMORY_DEVICE_INFO_KIND_NVDIMM; |
260 | } else { |
261 | info->u.dimm.data = di; |
262 | info->type = MEMORY_DEVICE_INFO_KIND_DIMM; |
263 | } |
264 | } |
265 | |
266 | static void pc_dimm_class_init(ObjectClass *oc, void *data) |
267 | { |
268 | DeviceClass *dc = DEVICE_CLASS(oc); |
269 | PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc); |
270 | MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(oc); |
271 | |
272 | dc->realize = pc_dimm_realize; |
273 | dc->unrealize = pc_dimm_unrealize; |
274 | dc->props = pc_dimm_properties; |
275 | dc->desc = "DIMM memory module" ; |
276 | |
277 | ddc->get_vmstate_memory_region = pc_dimm_get_memory_region; |
278 | |
279 | mdc->get_addr = pc_dimm_md_get_addr; |
280 | mdc->set_addr = pc_dimm_md_set_addr; |
281 | /* for a dimm plugged_size == region_size */ |
282 | mdc->get_plugged_size = memory_device_get_region_size; |
283 | mdc->get_memory_region = pc_dimm_md_get_memory_region; |
284 | mdc->fill_device_info = pc_dimm_md_fill_device_info; |
285 | } |
286 | |
287 | static TypeInfo pc_dimm_info = { |
288 | .name = TYPE_PC_DIMM, |
289 | .parent = TYPE_DEVICE, |
290 | .instance_size = sizeof(PCDIMMDevice), |
291 | .instance_init = pc_dimm_init, |
292 | .class_init = pc_dimm_class_init, |
293 | .class_size = sizeof(PCDIMMDeviceClass), |
294 | .interfaces = (InterfaceInfo[]) { |
295 | { TYPE_MEMORY_DEVICE }, |
296 | { } |
297 | }, |
298 | }; |
299 | |
300 | static void pc_dimm_register_types(void) |
301 | { |
302 | type_register_static(&pc_dimm_info); |
303 | } |
304 | |
305 | type_init(pc_dimm_register_types) |
306 | |