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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
35static int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp);
36
37void 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);
63out:
64 error_propagate(errp, local_err);
65}
66
67void 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
77void 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
87static 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) {
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
103static 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
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
131 slot = find_first_zero_bit(bitmap, max_slots);
132 if (slot == max_slots) {
133 error_setg(errp, "no free slots available");
134 }
135out:
136 g_free(bitmap);
137 return slot;
138}
139
140static 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
150static 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
165static 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
171static 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
202static 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
209static 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
219static 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
224static 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
230static 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
236static 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
266static 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
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
287static 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
300static void pc_dimm_register_types(void)
301{
302 type_register_static(&pc_dimm_info);
303}
304
305type_init(pc_dimm_register_types)
306
