hw/acpi/cpu.c

   1 #include "qemu/osdep.h"
   2 #include "hw/boards.h"
   3 #include "hw/acpi/cpu.h"
   4 #include "qapi/error.h"
   5 #include "trace.h"
   6
   7 #define ACPI_CPU_HOTPLUG_REG_LEN 12
   8 #define ACPI_CPU_SELECTOR_OFFSET_WR 0
   9 #define ACPI_CPU_FLAGS_OFFSET_RW 4
  10 #define ACPI_CPU_CMD_OFFSET_WR 5
  11 #define ACPI_CPU_CMD_DATA_OFFSET_RW 8
  12
  13 enum {
  14     CPHP_GET_NEXT_CPU_WITH_EVENT_CMD = 0,
  15     CPHP_CMD_MAX
  16 };
  17
  18 static uint64_t cpu_hotplug_rd(void *opaque, hwaddr addr, unsigned size)
  19 {
  20     uint64_t val = 0;
  21     CPUHotplugState *cpu_st = opaque;
  22     AcpiCpuStatus *cdev;
  23
  24     if (cpu_st->selector >= cpu_st->dev_count) {
  25         return val;
  26     }
  27
  28     cdev = &cpu_st->devs[cpu_st->selector];
  29     switch (addr) {
  30     case ACPI_CPU_FLAGS_OFFSET_RW: /* pack and return is_* fields */
  31         val |= cdev->cpu ? 1 : 0;
  32         val |= cdev->is_inserting ? 2 : 0;
  33         val |= cdev->is_removing  ? 4 : 0;
  34         trace_cpuhp_acpi_read_flags(cpu_st->selector, val);
  35         break;
  36     case ACPI_CPU_CMD_DATA_OFFSET_RW:
  37         switch (cpu_st->command) {
  38         case CPHP_GET_NEXT_CPU_WITH_EVENT_CMD:
  39            val = cpu_st->selector;
  40            break;
  41         default:
  42            break;
  43         }
  44         trace_cpuhp_acpi_read_cmd_data(cpu_st->selector, val);
  45         break;
  46     default:
  47         break;
  48     }
  49     return val;
  50 }
  51
  52 static void cpu_hotplug_wr(void *opaque, hwaddr addr, uint64_t data,
  53                            unsigned int size)
  54 {
  55     CPUHotplugState *cpu_st = opaque;
  56     AcpiCpuStatus *cdev;
  57
  58     assert(cpu_st->dev_count);
  59
  60     if (addr) {
  61         if (cpu_st->selector >= cpu_st->dev_count) {
  62             trace_cpuhp_acpi_invalid_idx_selected(cpu_st->selector);
  63             return;
  64         }
  65     }
  66
  67     switch (addr) {
  68     case ACPI_CPU_SELECTOR_OFFSET_WR: /* current CPU selector */
  69         cpu_st->selector = data;
  70         trace_cpuhp_acpi_write_idx(cpu_st->selector);
  71         break;
  72     case ACPI_CPU_FLAGS_OFFSET_RW: /* set is_* fields  */
  73         cdev = &cpu_st->devs[cpu_st->selector];
  74         if (data & 2) { /* clear insert event */
  75             cdev->is_inserting = false;
  76             trace_cpuhp_acpi_clear_inserting_evt(cpu_st->selector);
  77         } else if (data & 4) { /* clear remove event */
  78             cdev->is_removing = false;
  79             trace_cpuhp_acpi_clear_remove_evt(cpu_st->selector);
  80         } else if (data & 8) {
  81             DeviceState *dev = NULL;
  82             HotplugHandler *hotplug_ctrl = NULL;
  83
  84             if (!cdev->cpu) {
  85                 trace_cpuhp_acpi_ejecting_invalid_cpu(cpu_st->selector);
  86                 break;
  87             }
  88
  89             trace_cpuhp_acpi_ejecting_cpu(cpu_st->selector);
  90             dev = DEVICE(cdev->cpu);
  91             hotplug_ctrl = qdev_get_hotplug_handler(dev);
  92             hotplug_handler_unplug(hotplug_ctrl, dev, NULL);
  93         }
  94         break;
  95     case ACPI_CPU_CMD_OFFSET_WR:
  96         trace_cpuhp_acpi_write_cmd(cpu_st->selector, data);
  97         if (data < CPHP_CMD_MAX) {
  98             cpu_st->command = data;
  99             if (cpu_st->command == CPHP_GET_NEXT_CPU_WITH_EVENT_CMD) {
 100                 uint32_t iter = cpu_st->selector;
 101
 102                 do {
 103                     cdev = &cpu_st->devs[iter];
 104                     if (cdev->is_inserting || cdev->is_removing) {
 105                         cpu_st->selector = iter;
 106                         trace_cpuhp_acpi_cpu_has_events(cpu_st->selector,
 107                             cdev->is_inserting, cdev->is_removing);
 108                         break;
 109                     }
 110                     iter = iter + 1 < cpu_st->dev_count ? iter + 1 : 0;
 111                 } while (iter != cpu_st->selector);
 112             }
 113         }
 114         break;
 115     default:
 116         break;
 117     }
 118 }
 119
 120 static const MemoryRegionOps cpu_hotplug_ops = {
 121     .read = cpu_hotplug_rd,
 122     .write = cpu_hotplug_wr,
 123     .endianness = DEVICE_LITTLE_ENDIAN,
 124     .valid = {
 125         .min_access_size = 1,
 126         .max_access_size = 4,
 127     },
 128 };
 129
 130 void cpu_hotplug_hw_init(MemoryRegion *as, Object *owner,
 131                          CPUHotplugState *state, hwaddr base_addr)
 132 {
 133     MachineState *machine = MACHINE(qdev_get_machine());
 134     MachineClass *mc = MACHINE_GET_CLASS(machine);
 135     CPUArchIdList *id_list;
 136     int i;
 137
 138     assert(mc->possible_cpu_arch_ids);
 139     id_list = mc->possible_cpu_arch_ids(machine);
 140     state->dev_count = id_list->len;
 141     state->devs = g_new0(typeof(*state->devs), state->dev_count);
 142     for (i = 0; i < id_list->len; i++) {
 143         state->devs[i].cpu =  id_list->cpus[i].cpu;
 144         state->devs[i].arch_id = id_list->cpus[i].arch_id;
 145     }
 146     g_free(id_list);
 147     memory_region_init_io(&state->ctrl_reg, owner, &cpu_hotplug_ops, state,
 148                           "acpi-mem-hotplug", ACPI_CPU_HOTPLUG_REG_LEN);
 149     memory_region_add_subregion(as, base_addr, &state->ctrl_reg);
 150 }
 151
 152 static AcpiCpuStatus *get_cpu_status(CPUHotplugState *cpu_st, DeviceState *dev)
 153 {
 154     CPUClass *k = CPU_GET_CLASS(dev);
 155     uint64_t cpu_arch_id = k->get_arch_id(CPU(dev));
 156     int i;
 157
 158     for (i = 0; i < cpu_st->dev_count; i++) {
 159         if (cpu_arch_id == cpu_st->devs[i].arch_id) {
 160             return &cpu_st->devs[i];
 161         }
 162     }
 163     return NULL;
 164 }
 165
 166 void acpi_cpu_plug_cb(HotplugHandler *hotplug_dev,
 167                       CPUHotplugState *cpu_st, DeviceState *dev, Error **errp)
 168 {
 169     AcpiCpuStatus *cdev;
 170
 171     cdev = get_cpu_status(cpu_st, dev);
 172     if (!cdev) {
 173         return;
 174     }
 175
 176     cdev->cpu = CPU(dev);
 177     if (dev->hotplugged) {
 178         cdev->is_inserting = true;
 179         acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS);
 180     }
 181 }
 182
 183 void acpi_cpu_unplug_request_cb(HotplugHandler *hotplug_dev,
 184                                 CPUHotplugState *cpu_st,
 185                                 DeviceState *dev, Error **errp)
 186 {
 187     AcpiCpuStatus *cdev;
 188
 189     cdev = get_cpu_status(cpu_st, dev);
 190     if (!cdev) {
 191         return;
 192     }
 193
 194     cdev->is_removing = true;
 195     acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS);
 196 }
 197
 198 void acpi_cpu_unplug_cb(CPUHotplugState *cpu_st,
 199                         DeviceState *dev, Error **errp)
 200 {
 201     AcpiCpuStatus *cdev;
 202
 203     cdev = get_cpu_status(cpu_st, dev);
 204     if (!cdev) {
 205         return;
 206     }
 207
 208     cdev->cpu = NULL;
 209 }
 210
 211 static const VMStateDescription vmstate_cpuhp_sts = {
 212     .name = "CPU hotplug device state",
 213     .version_id = 1,
 214     .minimum_version_id = 1,
 215     .minimum_version_id_old = 1,
 216     .fields      = (VMStateField[]) {
 217         VMSTATE_BOOL(is_inserting, AcpiCpuStatus),
 218         VMSTATE_BOOL(is_removing, AcpiCpuStatus),
 219         VMSTATE_END_OF_LIST()
 220     }
 221 };
 222
 223 const VMStateDescription vmstate_cpu_hotplug = {
 224     .name = "CPU hotplug state",
 225     .version_id = 1,
 226     .minimum_version_id = 1,
 227     .minimum_version_id_old = 1,
 228     .fields      = (VMStateField[]) {
 229         VMSTATE_UINT32(selector, CPUHotplugState),
 230         VMSTATE_UINT8(command, CPUHotplugState),
 231         VMSTATE_STRUCT_VARRAY_POINTER_UINT32(devs, CPUHotplugState, dev_count,
 232                                              vmstate_cpuhp_sts, AcpiCpuStatus),
 233         VMSTATE_END_OF_LIST()
 234     }
 235 };
 236
 237 #define CPU_NAME_FMT      "C%.03X"
 238 #define CPUHP_RES_DEVICE  "PRES"
 239 #define CPU_LOCK          "CPLK"
 240 #define CPU_STS_METHOD    "CSTA"
 241 #define CPU_SCAN_METHOD   "CSCN"
 242 #define CPU_NOTIFY_METHOD "CTFY"
 243 #define CPU_EJECT_METHOD  "CEJ0"
 244
 245 #define CPU_ENABLED       "CPEN"
 246 #define CPU_SELECTOR      "CSEL"
 247 #define CPU_COMMAND       "CCMD"
 248 #define CPU_DATA          "CDAT"
 249 #define CPU_INSERT_EVENT  "CINS"
 250 #define CPU_REMOVE_EVENT  "CRMV"
 251 #define CPU_EJECT_EVENT   "CEJ0"
 252
 253 void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
 254                     hwaddr io_base,
 255                     const char *res_root,
 256                     const char *event_handler_method)
 257 {
 258     Aml *ifctx;
 259     Aml *field;
 260     Aml *method;
 261     Aml *cpu_ctrl_dev;
 262     Aml *cpus_dev;
 263     Aml *zero = aml_int(0);
 264     Aml *one = aml_int(1);
 265     Aml *sb_scope = aml_scope("_SB");
 266     MachineClass *mc = MACHINE_GET_CLASS(machine);
 267     CPUArchIdList *arch_ids = mc->possible_cpu_arch_ids(machine);
 268     char *cphp_res_path = g_strdup_printf("%s." CPUHP_RES_DEVICE, res_root);
 269     Object *obj = object_resolve_path_type("", TYPE_ACPI_DEVICE_IF, NULL);
 270     AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_GET_CLASS(obj);
 271     AcpiDeviceIf *adev = ACPI_DEVICE_IF(obj);
 272
 273     cpu_ctrl_dev = aml_device("%s", cphp_res_path);
 274     {
 275         Aml *crs;
 276
 277         aml_append(cpu_ctrl_dev,
 278             aml_name_decl("_HID", aml_eisaid("PNP0A06")));
 279         aml_append(cpu_ctrl_dev,
 280             aml_name_decl("_UID", aml_string("CPU Hotplug resources")));
 281         aml_append(cpu_ctrl_dev, aml_mutex(CPU_LOCK, 0));
 282
 283         crs = aml_resource_template();
 284         aml_append(crs, aml_io(AML_DECODE16, io_base, io_base, 1,
 285                                ACPI_CPU_HOTPLUG_REG_LEN));
 286         aml_append(cpu_ctrl_dev, aml_name_decl("_CRS", crs));
 287
 288         /* declare CPU hotplug MMIO region with related access fields */
 289         aml_append(cpu_ctrl_dev,
 290             aml_operation_region("PRST", AML_SYSTEM_IO, aml_int(io_base),
 291                                  ACPI_CPU_HOTPLUG_REG_LEN));
 292
 293         field = aml_field("PRST", AML_BYTE_ACC, AML_NOLOCK,
 294                           AML_WRITE_AS_ZEROS);
 295         aml_append(field, aml_reserved_field(ACPI_CPU_FLAGS_OFFSET_RW * 8));
 296         /* 1 if enabled, read only */
 297         aml_append(field, aml_named_field(CPU_ENABLED, 1));
 298         /* (read) 1 if has a insert event. (write) 1 to clear event */
 299         aml_append(field, aml_named_field(CPU_INSERT_EVENT, 1));
 300         /* (read) 1 if has a remove event. (write) 1 to clear event */
 301         aml_append(field, aml_named_field(CPU_REMOVE_EVENT, 1));
 302         /* initiates device eject, write only */
 303         aml_append(field, aml_named_field(CPU_EJECT_EVENT, 1));
 304         aml_append(field, aml_reserved_field(4));
 305         aml_append(field, aml_named_field(CPU_COMMAND, 8));
 306         aml_append(cpu_ctrl_dev, field);
 307
 308         field = aml_field("PRST", AML_DWORD_ACC, AML_NOLOCK, AML_PRESERVE);
 309         /* CPU selector, write only */
 310         aml_append(field, aml_named_field(CPU_SELECTOR, 32));
 311         /* flags + cmd + 2byte align */
 312         aml_append(field, aml_reserved_field(4 * 8));
 313         aml_append(field, aml_named_field(CPU_DATA, 32));
 314         aml_append(cpu_ctrl_dev, field);
 315
 316     }
 317     aml_append(sb_scope, cpu_ctrl_dev);
 318
 319     cpus_dev = aml_device("\\_SB.CPUS");
 320     {
 321         int i;
 322         Aml *ctrl_lock = aml_name("%s.%s", cphp_res_path, CPU_LOCK);
 323         Aml *cpu_selector = aml_name("%s.%s", cphp_res_path, CPU_SELECTOR);
 324         Aml *is_enabled = aml_name("%s.%s", cphp_res_path, CPU_ENABLED);
 325         Aml *cpu_cmd = aml_name("%s.%s", cphp_res_path, CPU_COMMAND);
 326         Aml *cpu_data = aml_name("%s.%s", cphp_res_path, CPU_DATA);
 327         Aml *ins_evt = aml_name("%s.%s", cphp_res_path, CPU_INSERT_EVENT);
 328         Aml *rm_evt = aml_name("%s.%s", cphp_res_path, CPU_REMOVE_EVENT);
 329         Aml *ej_evt = aml_name("%s.%s", cphp_res_path, CPU_EJECT_EVENT);
 330
 331         aml_append(cpus_dev, aml_name_decl("_HID", aml_string("ACPI0010")));
 332         aml_append(cpus_dev, aml_name_decl("_CID", aml_eisaid("PNP0A05")));
 333
 334         method = aml_method(CPU_NOTIFY_METHOD, 2, AML_NOTSERIALIZED);
 335         for (i = 0; i < arch_ids->len; i++) {
 336             Aml *cpu = aml_name(CPU_NAME_FMT, i);
 337             Aml *uid = aml_arg(0);
 338             Aml *event = aml_arg(1);
 339
 340             ifctx = aml_if(aml_equal(uid, aml_int(i)));
 341             {
 342                 aml_append(ifctx, aml_notify(cpu, event));
 343             }
 344             aml_append(method, ifctx);
 345         }
 346         aml_append(cpus_dev, method);
 347
 348         method = aml_method(CPU_STS_METHOD, 1, AML_SERIALIZED);
 349         {
 350             Aml *idx = aml_arg(0);
 351             Aml *sta = aml_local(0);
 352
 353             aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 354             aml_append(method, aml_store(idx, cpu_selector));
 355             aml_append(method, aml_store(zero, sta));
 356             ifctx = aml_if(aml_equal(is_enabled, one));
 357             {
 358                 aml_append(ifctx, aml_store(aml_int(0xF), sta));
 359             }
 360             aml_append(method, ifctx);
 361             aml_append(method, aml_release(ctrl_lock));
 362             aml_append(method, aml_return(sta));
 363         }
 364         aml_append(cpus_dev, method);
 365
 366         method = aml_method(CPU_EJECT_METHOD, 1, AML_SERIALIZED);
 367         {
 368             Aml *idx = aml_arg(0);
 369
 370             aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 371             aml_append(method, aml_store(idx, cpu_selector));
 372             aml_append(method, aml_store(one, ej_evt));
 373             aml_append(method, aml_release(ctrl_lock));
 374         }
 375         aml_append(cpus_dev, method);
 376
 377         method = aml_method(CPU_SCAN_METHOD, 0, AML_SERIALIZED);
 378         {
 379             Aml *else_ctx;
 380             Aml *while_ctx;
 381             Aml *has_event = aml_local(0);
 382             Aml *dev_chk = aml_int(1);
 383             Aml *eject_req = aml_int(3);
 384             Aml *next_cpu_cmd = aml_int(CPHP_GET_NEXT_CPU_WITH_EVENT_CMD);
 385
 386             aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 387             aml_append(method, aml_store(one, has_event));
 388             while_ctx = aml_while(aml_equal(has_event, one));
 389             {
 390                  /* clear loop exit condition, ins_evt/rm_evt checks
 391                   * will set it to 1 while next_cpu_cmd returns a CPU
 392                   * with events */
 393                  aml_append(while_ctx, aml_store(zero, has_event));
 394                  aml_append(while_ctx, aml_store(next_cpu_cmd, cpu_cmd));
 395                  ifctx = aml_if(aml_equal(ins_evt, one));
 396                  {
 397                      aml_append(ifctx,
 398                          aml_call2(CPU_NOTIFY_METHOD, cpu_data, dev_chk));
 399                      aml_append(ifctx, aml_store(one, ins_evt));
 400                      aml_append(ifctx, aml_store(one, has_event));
 401                  }
 402                  aml_append(while_ctx, ifctx);
 403                  else_ctx = aml_else();
 404                  ifctx = aml_if(aml_equal(rm_evt, one));
 405                  {
 406                      aml_append(ifctx,
 407                          aml_call2(CPU_NOTIFY_METHOD, cpu_data, eject_req));
 408                      aml_append(ifctx, aml_store(one, rm_evt));
 409                      aml_append(ifctx, aml_store(one, has_event));
 410                  }
 411                  aml_append(else_ctx, ifctx);
 412                  aml_append(while_ctx, else_ctx);
 413             }
 414             aml_append(method, while_ctx);
 415             aml_append(method, aml_release(ctrl_lock));
 416         }
 417         aml_append(cpus_dev, method);
 418
 419         /* build Processor object for each processor */
 420         for (i = 0; i < arch_ids->len; i++) {
 421             Aml *dev;
 422             Aml *uid = aml_int(i);
 423             GArray *madt_buf = g_array_new(0, 1, 1);
 424             int arch_id = arch_ids->cpus[i].arch_id;
 425
 426             if (opts.apci_1_compatible && arch_id < 255) {
 427                 dev = aml_processor(i, 0, 0, CPU_NAME_FMT, i);
 428             } else {
 429                 dev = aml_device(CPU_NAME_FMT, i);
 430                 aml_append(dev, aml_name_decl("_HID", aml_string("ACPI0007")));
 431                 aml_append(dev, aml_name_decl("_UID", uid));
 432             }
 433
 434             method = aml_method("_STA", 0, AML_SERIALIZED);
 435             aml_append(method, aml_return(aml_call1(CPU_STS_METHOD, uid)));
 436             aml_append(dev, method);
 437
 438             /* build _MAT object */
 439             assert(adevc && adevc->madt_cpu);
 440             adevc->madt_cpu(adev, i, arch_ids, madt_buf);
 441             switch (madt_buf->data[0]) {
 442             case ACPI_APIC_PROCESSOR: {
 443                 AcpiMadtProcessorApic *apic = (void *)madt_buf->data;
 444                 apic->flags = cpu_to_le32(1);
 445                 break;
 446             }
 447             default:
 448                 assert(0);
 449             }
 450             aml_append(dev, aml_name_decl("_MAT",
 451                 aml_buffer(madt_buf->len, (uint8_t *)madt_buf->data)));
 452             g_array_free(madt_buf, true);
 453
 454             method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
 455             aml_append(method, aml_call1(CPU_EJECT_METHOD, uid));
 456             aml_append(dev, method);
 457
 458             aml_append(cpus_dev, dev);
 459         }
 460     }
 461     aml_append(sb_scope, cpus_dev);
 462     aml_append(table, sb_scope);
 463
 464     method = aml_method(event_handler_method, 0, AML_NOTSERIALIZED);
 465     aml_append(method, aml_call0("\\_SB.CPUS." CPU_SCAN_METHOD));
 466     aml_append(table, method);
 467
 468     g_free(cphp_res_path);
 469     g_free(arch_ids);
 470 }