acpi_cpu.c revision 1.4
1 /* $NetBSD: acpi_cpu.c,v 1.4 2010/07/21 14:59:31 cegger Exp $ */ 2 3 /*- 4 * Copyright (c) 2010 Jukka Ruohonen <jruohonen (at) iki.fi> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: acpi_cpu.c,v 1.4 2010/07/21 14:59:31 cegger Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/cpu.h> 34 #include <sys/kernel.h> 35 #include <sys/kmem.h> 36 #include <sys/module.h> 37 #include <sys/once.h> 38 39 #include <dev/acpi/acpireg.h> 40 #include <dev/acpi/acpivar.h> 41 #include <dev/acpi/acpi_cpu.h> 42 43 #include <machine/acpi_machdep.h> 44 45 #define _COMPONENT ACPI_BUS_COMPONENT 46 ACPI_MODULE_NAME ("acpi_cpu") 47 48 static int acpicpu_match(device_t, cfdata_t, void *); 49 static void acpicpu_attach(device_t, device_t, void *); 50 static int acpicpu_detach(device_t, int); 51 static int acpicpu_once_attach(void); 52 static int acpicpu_once_detach(void); 53 54 static int acpicpu_object(ACPI_HANDLE, struct acpicpu_object *); 55 static cpuid_t acpicpu_id(uint32_t); 56 static uint32_t acpicpu_cap(struct acpicpu_softc *); 57 static ACPI_OBJECT *acpicpu_cap_init(void); 58 static ACPI_STATUS acpicpu_cap_pdc(ACPI_HANDLE); 59 static ACPI_STATUS acpicpu_cap_osc(ACPI_HANDLE, uint32_t *); 60 static const char *acpicpu_cap_oscerr(uint32_t); 61 static void acpicpu_notify(ACPI_HANDLE, uint32_t, void *); 62 static bool acpicpu_suspend(device_t, const pmf_qual_t *); 63 static bool acpicpu_resume(device_t, const pmf_qual_t *); 64 65 kmutex_t acpicpu_mtx; 66 struct acpicpu_softc **acpicpu_sc = NULL; 67 68 static const char * const acpicpu_hid[] = { 69 "ACPI0007", 70 NULL 71 }; 72 73 CFATTACH_DECL_NEW(acpicpu, sizeof(struct acpicpu_softc), 74 acpicpu_match, acpicpu_attach, acpicpu_detach, NULL); 75 76 static int 77 acpicpu_match(device_t parent, cfdata_t match, void *aux) 78 { 79 struct acpi_attach_args *aa = aux; 80 struct acpicpu_object ao; 81 82 if (aa->aa_node->ad_type != ACPI_TYPE_PROCESSOR) 83 return 0; 84 85 if (acpi_match_hid(aa->aa_node->ad_devinfo, acpicpu_hid) != 0) 86 return 1; 87 88 int rv = acpicpu_object(aa->aa_node->ad_handle, &ao); 89 if (rv == 0 || acpicpu_id(ao.ao_procid) == 0xFFFFFF) 90 return 0; 91 return 1; 92 } 93 94 static void 95 acpicpu_attach(device_t parent, device_t self, void *aux) 96 { 97 struct acpicpu_softc *sc = device_private(self); 98 struct acpi_attach_args *aa = aux; 99 static ONCE_DECL(once_attach); 100 int rv; 101 102 rv = acpicpu_object(aa->aa_node->ad_handle, &sc->sc_object); 103 104 if (rv == 0) 105 return; 106 107 rv = RUN_ONCE(&once_attach, acpicpu_once_attach); 108 109 if (rv != 0) 110 return; 111 112 KASSERT(acpicpu_sc != NULL); 113 114 mutex_enter(&acpicpu_mtx); 115 116 sc->sc_dev = self; 117 sc->sc_iot = aa->aa_iot; 118 sc->sc_node = aa->aa_node; 119 sc->sc_cpuid = acpicpu_id(sc->sc_object.ao_procid); 120 121 if (sc->sc_cpuid == 0xFFFFFF) { 122 mutex_exit(&acpicpu_mtx); 123 aprint_error(": invalid CPU ID\n"); 124 return; 125 } 126 127 if (acpicpu_sc[sc->sc_cpuid] != NULL) { 128 mutex_exit(&acpicpu_mtx); 129 aprint_error(": already probed\n"); 130 return; 131 } 132 133 acpicpu_sc[sc->sc_cpuid] = sc; 134 mutex_exit(&acpicpu_mtx); 135 136 sc->sc_cap = acpicpu_cap(sc); 137 sc->sc_flags |= acpicpu_md_quirks(); 138 139 aprint_naive("\n"); 140 aprint_normal(": ACPI CPU"); 141 aprint_verbose(", cap 0x%02x, addr 0x%06x, len 0x%02x", 142 sc->sc_cap, sc->sc_object.ao_pblkaddr, sc->sc_object.ao_pblklen); 143 aprint_normal("\n"); 144 145 /* 146 * We should claim the bus space. However, we do this only 147 * to announce that the space is in use. This is unnecessary 148 * if system I/O type C-states are not used. Many systems also 149 * report invalid values in the processor object. Finally, this 150 * is known to conflict with other devices. But as is noted in 151 * ichlpcib(4), we can continue our I/O without bus_space(9). 152 */ 153 if (sc->sc_object.ao_pblklen == 6 && sc->sc_object.ao_pblkaddr != 0) { 154 155 rv = bus_space_map(sc->sc_iot, sc->sc_object.ao_pblkaddr, 156 sc->sc_object.ao_pblklen, 0, &sc->sc_ioh); 157 158 if (rv != 0) 159 sc->sc_ioh = 0; 160 } 161 162 acpicpu_cstate_attach(self); 163 164 (void)acpi_register_notify(sc->sc_node, acpicpu_notify); 165 (void)config_finalize_register(self, acpicpu_cstate_start); 166 (void)pmf_device_register(self, acpicpu_suspend, acpicpu_resume); 167 } 168 169 static int 170 acpicpu_detach(device_t self, int flags) 171 { 172 struct acpicpu_softc *sc = device_private(self); 173 const bus_addr_t addr = sc->sc_object.ao_pblkaddr; 174 static ONCE_DECL(once_detach); 175 int rv = 0; 176 177 acpi_deregister_notify(sc->sc_node); 178 179 if ((sc->sc_flags & ACPICPU_FLAG_C) != 0) 180 rv = acpicpu_cstate_detach(self); 181 182 if (rv != 0) 183 return rv; 184 185 rv = RUN_ONCE(&once_detach, acpicpu_once_detach); 186 187 if (rv != 0) 188 return rv; 189 190 if (sc->sc_ioh != 0) 191 bus_space_unmap(sc->sc_iot, sc->sc_ioh, addr); 192 193 return 0; 194 } 195 196 static int 197 acpicpu_once_attach(void) 198 { 199 struct acpicpu_softc *sc; 200 unsigned int i; 201 202 acpicpu_sc = kmem_zalloc(maxcpus * sizeof(*sc), KM_SLEEP); 203 204 if (acpicpu_sc == NULL) 205 return ENOMEM; 206 207 for (i = 0; i < maxcpus; i++) 208 acpicpu_sc[i] = NULL; 209 210 mutex_init(&acpicpu_mtx, MUTEX_DEFAULT, IPL_VM); 211 212 return 0; 213 } 214 215 static int 216 acpicpu_once_detach(void) 217 { 218 struct acpicpu_softc *sc; 219 220 KASSERT(acpicpu_sc != NULL); 221 222 mutex_destroy(&acpicpu_mtx); 223 kmem_free(acpicpu_sc, maxcpus * sizeof(*sc)); 224 acpicpu_sc = NULL; 225 226 return 0; 227 } 228 229 static int 230 acpicpu_object(ACPI_HANDLE hdl, struct acpicpu_object *ao) 231 { 232 ACPI_OBJECT *obj; 233 ACPI_BUFFER buf; 234 ACPI_STATUS rv; 235 236 rv = acpi_eval_struct(hdl, NULL, &buf); 237 238 if (ACPI_FAILURE(rv)) 239 return 0; 240 241 obj = buf.Pointer; 242 243 if (obj->Type != ACPI_TYPE_PROCESSOR) { 244 rv = AE_TYPE; 245 goto out; 246 } 247 248 if (obj->Processor.ProcId > (uint32_t)maxcpus) { 249 rv = AE_LIMIT; 250 goto out; 251 } 252 253 KDASSERT((uint64_t)obj->Processor.PblkAddress < UINT32_MAX); 254 255 if (ao != NULL) { 256 ao->ao_procid = obj->Processor.ProcId; 257 ao->ao_pblklen = obj->Processor.PblkLength; 258 ao->ao_pblkaddr = obj->Processor.PblkAddress; 259 } 260 261 out: 262 if (buf.Pointer != NULL) 263 ACPI_FREE(buf.Pointer); 264 265 return ACPI_FAILURE(rv) ? 0 : 1; 266 } 267 268 static cpuid_t 269 acpicpu_id(uint32_t id) 270 { 271 CPU_INFO_ITERATOR cii; 272 struct cpu_info *ci; 273 274 for (CPU_INFO_FOREACH(cii, ci)) { 275 if (id == ci->ci_cpuid) 276 return id; 277 } 278 279 return 0xFFFFFF; 280 } 281 282 static uint32_t 283 acpicpu_cap(struct acpicpu_softc *sc) 284 { 285 uint32_t cap[3] = { 0 }; 286 ACPI_STATUS rv; 287 int err; 288 289 /* 290 * Set machine-dependent processor capabilities. 291 * 292 * The _PDC was deprecated in ACPI 3.0 in favor of the _OSC, 293 * but firmware may expect that we evaluate it nevertheless. 294 */ 295 rv = acpicpu_cap_pdc(sc->sc_node->ad_handle); 296 297 if (ACPI_FAILURE(rv) && rv != AE_NOT_FOUND) 298 aprint_error_dev(sc->sc_dev, "failed to evaluate _PDC: " 299 "%s\n", AcpiFormatException(rv)); 300 301 rv = acpicpu_cap_osc(sc->sc_node->ad_handle, cap); 302 303 if (ACPI_FAILURE(rv) && rv != AE_NOT_FOUND) 304 aprint_error_dev(sc->sc_dev, "failed to evaluate _OSC: " 305 "%s\n", AcpiFormatException(rv)); 306 307 if (ACPI_SUCCESS(rv)) { 308 309 err = cap[0] & ~__BIT(0); 310 311 if (err != 0) { 312 aprint_error_dev(sc->sc_dev, "errors in " 313 "_OSC: %s\n", acpicpu_cap_oscerr(err)); 314 cap[2] = 0; 315 } 316 } 317 318 return cap[2]; 319 } 320 321 static ACPI_OBJECT * 322 acpicpu_cap_init(void) 323 { 324 static uint32_t cap[3]; 325 static ACPI_OBJECT obj; 326 327 cap[0] = ACPICPU_PDC_REVID; 328 cap[1] = 1; 329 cap[2] = acpicpu_md_cap(); 330 331 obj.Type = ACPI_TYPE_BUFFER; 332 obj.Buffer.Length = sizeof(cap); 333 obj.Buffer.Pointer = (uint8_t *)cap; 334 335 return &obj; 336 } 337 338 static ACPI_STATUS 339 acpicpu_cap_pdc(ACPI_HANDLE hdl) 340 { 341 ACPI_OBJECT_LIST arg_list; 342 343 arg_list.Count = 1; 344 arg_list.Pointer = acpicpu_cap_init(); 345 346 return AcpiEvaluateObject(hdl, "_PDC", &arg_list, NULL); 347 } 348 349 static ACPI_STATUS 350 acpicpu_cap_osc(ACPI_HANDLE hdl, uint32_t *val) 351 { 352 ACPI_OBJECT_LIST arg_list; 353 ACPI_OBJECT *cap, *obj; 354 ACPI_OBJECT arg[4]; 355 ACPI_BUFFER buf; 356 ACPI_STATUS rv; 357 358 /* Intel. */ 359 static uint8_t cpu_oscuuid[16] = { 360 0x16, 0xA6, 0x77, 0x40, 0x0C, 0x29, 0xBE, 0x47, 361 0x9E, 0xBD, 0xD8, 0x70, 0x58, 0x71, 0x39, 0x53 362 }; 363 364 cap = acpicpu_cap_init(); 365 366 arg_list.Count = 4; 367 arg_list.Pointer = arg; 368 369 arg[0].Type = ACPI_TYPE_BUFFER; 370 arg[0].Buffer.Length = sizeof(cpu_oscuuid); 371 arg[0].Buffer.Pointer = cpu_oscuuid; 372 373 arg[1].Type = ACPI_TYPE_INTEGER; 374 arg[1].Integer.Value = ACPICPU_PDC_REVID; 375 376 arg[2].Type = ACPI_TYPE_INTEGER; 377 arg[2].Integer.Value = cap->Buffer.Length / sizeof(uint32_t); 378 379 arg[3] = *cap; 380 381 buf.Pointer = NULL; 382 buf.Length = ACPI_ALLOCATE_LOCAL_BUFFER; 383 384 rv = AcpiEvaluateObject(hdl, "_OSC", &arg_list, &buf); 385 386 if (ACPI_FAILURE(rv)) 387 return rv; 388 389 obj = buf.Pointer; 390 391 if (obj->Type != ACPI_TYPE_BUFFER) { 392 rv = AE_TYPE; 393 goto out; 394 } 395 396 if (obj->Buffer.Length != cap->Buffer.Length) { 397 rv = AE_BUFFER_OVERFLOW; 398 goto out; 399 } 400 401 (void)memcpy(val, obj->Buffer.Pointer, obj->Buffer.Length); 402 403 out: 404 if (buf.Pointer != NULL) 405 ACPI_FREE(buf.Pointer); 406 407 return rv; 408 } 409 410 static const char * 411 acpicpu_cap_oscerr(uint32_t err) 412 { 413 414 KASSERT((err & __BIT(0)) == 0); 415 416 if ((err & __BIT(1)) != 0) 417 return "_OSC failure"; 418 419 if ((err & __BIT(2)) != 0) 420 return "unrecognized UUID"; 421 422 if ((err & __BIT(3)) != 0) 423 return "unrecognized revision"; 424 425 if ((err & __BIT(4)) != 0) 426 return "capabilities masked"; 427 428 return "unknown error"; 429 } 430 431 static void 432 acpicpu_notify(ACPI_HANDLE hdl, uint32_t evt, void *aux) 433 { 434 ACPI_OSD_EXEC_CALLBACK func; 435 struct acpicpu_softc *sc; 436 device_t self = aux; 437 438 sc = device_private(self); 439 440 if ((sc->sc_flags & ACPICPU_FLAG_INIT) == 0) 441 return; 442 443 switch (evt) { 444 445 case ACPICPU_C_NOTIFY: 446 447 if ((sc->sc_flags & ACPICPU_FLAG_C) == 0) 448 return; 449 450 func = acpicpu_cstate_callback; 451 break; 452 453 case ACPICPU_P_NOTIFY: 454 455 if ((sc->sc_flags & ACPICPU_FLAG_P) == 0) 456 return; 457 458 func = NULL; 459 break; 460 461 case ACPICPU_T_NOTIFY: 462 463 if ((sc->sc_flags & ACPICPU_FLAG_T) == 0) 464 return; 465 466 func = NULL; 467 break; 468 469 default: 470 aprint_error_dev(sc->sc_dev, "unknown notify: 0x%02X\n", evt); 471 return; 472 } 473 474 (void)AcpiOsExecute(OSL_NOTIFY_HANDLER, func, sc->sc_dev); 475 } 476 477 static bool 478 acpicpu_suspend(device_t self, const pmf_qual_t *qual) 479 { 480 struct acpicpu_softc *sc = device_private(self); 481 482 if ((sc->sc_flags & ACPICPU_FLAG_C) != 0) 483 (void)acpicpu_cstate_suspend(self); 484 485 return true; 486 } 487 488 static bool 489 acpicpu_resume(device_t self, const pmf_qual_t *qual) 490 { 491 struct acpicpu_softc *sc = device_private(self); 492 493 if ((sc->sc_flags & ACPICPU_FLAG_C) != 0) 494 (void)acpicpu_cstate_resume(self); 495 496 return true; 497 } 498 499 #ifdef _MODULE 500 501 MODULE(MODULE_CLASS_DRIVER, acpicpu, NULL); 502 CFDRIVER_DECL(acpicpu, DV_DULL, NULL); 503 504 static int acpicpuloc[] = { -1 }; 505 extern struct cfattach acpicpu_ca; 506 507 static struct cfparent acpiparent = { 508 "acpinodebus", NULL, DVUNIT_ANY 509 }; 510 511 static struct cfdata acpicpu_cfdata[] = { 512 { 513 .cf_name = "acpicpu", 514 .cf_atname = "acpicpu", 515 .cf_unit = 0, 516 .cf_fstate = FSTATE_STAR, 517 .cf_loc = acpicpuloc, 518 .cf_flags = 0, 519 .cf_pspec = &acpiparent, 520 }, 521 522 { NULL, NULL, 0, 0, NULL, 0, NULL } 523 }; 524 525 static int 526 acpicpu_modcmd(modcmd_t cmd, void *context) 527 { 528 int err; 529 530 switch (cmd) { 531 532 case MODULE_CMD_INIT: 533 534 err = config_cfdriver_attach(&acpicpu_cd); 535 536 if (err != 0) 537 return err; 538 539 err = config_cfattach_attach("acpicpu", &acpicpu_ca); 540 541 if (err != 0) { 542 config_cfdriver_detach(&acpicpu_cd); 543 return err; 544 } 545 546 err = config_cfdata_attach(acpicpu_cfdata, 1); 547 548 if (err != 0) { 549 config_cfattach_detach("acpicpu", &acpicpu_ca); 550 config_cfdriver_detach(&acpicpu_cd); 551 return err; 552 } 553 554 return 0; 555 556 case MODULE_CMD_FINI: 557 558 err = config_cfdata_detach(acpicpu_cfdata); 559 560 if (err != 0) 561 return err; 562 563 config_cfattach_detach("acpicpu", &acpicpu_ca); 564 config_cfdriver_detach(&acpicpu_cd); 565 566 return 0; 567 568 default: 569 return ENOTTY; 570 } 571 } 572 573 #endif /* _MODULE */ 574
Indexes created Thu Sep 25 08:09:54 GMT 2025