acpi_cpu_pstate.c revision 1.12
1 /* $NetBSD: acpi_cpu_pstate.c,v 1.12 2010/08/11 16:41:19 jruoho 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_pstate.c,v 1.12 2010/08/11 16:41:19 jruoho Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/evcnt.h> 34 #include <sys/kmem.h> 35 #include <sys/once.h> 36 37 #include <dev/acpi/acpireg.h> 38 #include <dev/acpi/acpivar.h> 39 #include <dev/acpi/acpi_cpu.h> 40 41 #define _COMPONENT ACPI_BUS_COMPONENT 42 ACPI_MODULE_NAME ("acpi_cpu_pstate") 43 44 static void acpicpu_pstate_attach_print(struct acpicpu_softc *); 45 static void acpicpu_pstate_attach_evcnt(struct acpicpu_softc *); 46 static void acpicpu_pstate_detach_evcnt(struct acpicpu_softc *); 47 static ACPI_STATUS acpicpu_pstate_pss(struct acpicpu_softc *sc); 48 static ACPI_STATUS acpicpu_pstate_pss_add(struct acpicpu_pstate *, 49 ACPI_OBJECT *); 50 static ACPI_STATUS acpicpu_pstate_pct(struct acpicpu_softc *); 51 static int acpicpu_pstate_max(struct acpicpu_softc *); 52 static void acpicpu_pstate_change(struct acpicpu_softc *); 53 static void acpicpu_pstate_bios(void); 54 55 void 56 acpicpu_pstate_attach(device_t self) 57 { 58 struct acpicpu_softc *sc = device_private(self); 59 const char *str; 60 ACPI_STATUS rv; 61 62 rv = acpicpu_pstate_pss(sc); 63 64 if (ACPI_FAILURE(rv)) { 65 str = "_PSS"; 66 goto fail; 67 } 68 69 rv = acpicpu_pstate_pct(sc); 70 71 if (rv == AE_SUPPORT) { 72 aprint_error_dev(sc->sc_dev, "CPU not supported\n"); 73 return; 74 } 75 76 if (ACPI_FAILURE(rv)) { 77 str = "_PCT"; 78 goto fail; 79 } 80 81 rv = acpicpu_pstate_max(sc); 82 83 if (rv == 0) 84 sc->sc_flags |= ACPICPU_FLAG_P_PPC; 85 86 sc->sc_flags |= ACPICPU_FLAG_P; 87 sc->sc_pstate_current = sc->sc_pstate[0].ps_freq; 88 89 acpicpu_pstate_bios(); 90 acpicpu_pstate_attach_evcnt(sc); 91 acpicpu_pstate_attach_print(sc); 92 93 return; 94 95 fail: 96 aprint_error_dev(sc->sc_dev, "failed to evaluate " 97 "%s: %s\n", str, AcpiFormatException(rv)); 98 } 99 100 static void 101 acpicpu_pstate_attach_print(struct acpicpu_softc *sc) 102 { 103 const uint8_t method = sc->sc_pstate_control.reg_spaceid; 104 struct acpicpu_pstate *ps; 105 static bool once = false; 106 const char *str; 107 uint32_t i; 108 109 if (once != false) 110 return; 111 112 str = (method != ACPI_ADR_SPACE_SYSTEM_IO) ? "FFH" : "I/O"; 113 114 for (i = 0; i < sc->sc_pstate_count; i++) { 115 116 ps = &sc->sc_pstate[i]; 117 118 if (ps->ps_freq == 0) 119 continue; 120 121 aprint_debug_dev(sc->sc_dev, "P%d: %3s, " 122 "lat %3u us, pow %5u mW, %4u MHz\n", 123 i, str, ps->ps_latency, ps->ps_power, ps->ps_freq); 124 } 125 126 once = true; 127 } 128 129 static void 130 acpicpu_pstate_attach_evcnt(struct acpicpu_softc *sc) 131 { 132 struct acpicpu_pstate *ps; 133 uint32_t i; 134 135 for (i = 0; i < sc->sc_pstate_count; i++) { 136 137 ps = &sc->sc_pstate[i]; 138 139 if (ps->ps_freq == 0) 140 continue; 141 142 (void)snprintf(ps->ps_name, sizeof(ps->ps_name), 143 "P%u (%u MHz)", i, ps->ps_freq); 144 145 evcnt_attach_dynamic(&ps->ps_evcnt, EVCNT_TYPE_MISC, 146 NULL, device_xname(sc->sc_dev), ps->ps_name); 147 } 148 } 149 150 int 151 acpicpu_pstate_detach(device_t self) 152 { 153 struct acpicpu_softc *sc = device_private(self); 154 static ONCE_DECL(once_detach); 155 size_t size; 156 int rv; 157 158 if ((sc->sc_flags & ACPICPU_FLAG_P) == 0) 159 return 0; 160 161 rv = RUN_ONCE(&once_detach, acpicpu_md_pstate_stop); 162 163 if (rv != 0) 164 return rv; 165 166 size = sc->sc_pstate_count * sizeof(*sc->sc_pstate); 167 168 if (sc->sc_pstate != NULL) 169 kmem_free(sc->sc_pstate, size); 170 171 sc->sc_flags &= ~ACPICPU_FLAG_P; 172 acpicpu_pstate_detach_evcnt(sc); 173 174 return 0; 175 } 176 177 static void 178 acpicpu_pstate_detach_evcnt(struct acpicpu_softc *sc) 179 { 180 struct acpicpu_pstate *ps; 181 uint32_t i; 182 183 for (i = 0; i < sc->sc_pstate_count; i++) { 184 185 ps = &sc->sc_pstate[i]; 186 187 if (ps->ps_freq != 0) 188 evcnt_detach(&ps->ps_evcnt); 189 } 190 } 191 192 int 193 acpicpu_pstate_start(device_t self) 194 { 195 struct acpicpu_softc *sc = device_private(self); 196 static ONCE_DECL(once_start); 197 198 if ((sc->sc_flags & ACPICPU_FLAG_P) == 0) 199 return 0; 200 201 return RUN_ONCE(&once_start, acpicpu_md_pstate_start); 202 } 203 204 bool 205 acpicpu_pstate_suspend(device_t self) 206 { 207 208 return true; 209 } 210 211 bool 212 acpicpu_pstate_resume(device_t self) 213 { 214 static const ACPI_OSD_EXEC_CALLBACK func = acpicpu_pstate_callback; 215 struct acpicpu_softc *sc = device_private(self); 216 217 KASSERT((sc->sc_flags & ACPICPU_FLAG_P) != 0); 218 219 if ((sc->sc_flags & ACPICPU_FLAG_P_PPC) != 0) 220 (void)AcpiOsExecute(OSL_NOTIFY_HANDLER, func, sc->sc_dev); 221 222 return true; 223 } 224 225 void 226 acpicpu_pstate_callback(void *aux) 227 { 228 struct acpicpu_softc *sc; 229 device_t self = aux; 230 uint32_t old, new; 231 232 sc = device_private(self); 233 234 if ((sc->sc_flags & ACPICPU_FLAG_P_PPC) == 0) 235 return; 236 237 mutex_enter(&sc->sc_mtx); 238 239 old = sc->sc_pstate_max; 240 acpicpu_pstate_change(sc); 241 new = sc->sc_pstate_max; 242 243 mutex_exit(&sc->sc_mtx); 244 245 #if 0 246 if (old != new) { 247 248 /* 249 * If the maximum changed, proactively 250 * raise or lower the target frequency. 251 */ 252 acpicpu_pstate_set(sc, sc->sc_pstate[new].ps_freq); 253 254 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "frequency changed from " 255 "%u MHz to %u MHz\n", sc->sc_pstate[old].ps_freq, 256 sc->sc_pstate[sc->sc_pstate_max].ps_freq)); 257 } 258 #endif 259 } 260 261 ACPI_STATUS 262 acpicpu_pstate_pss(struct acpicpu_softc *sc) 263 { 264 struct acpicpu_pstate *ps; 265 ACPI_OBJECT *obj; 266 ACPI_BUFFER buf; 267 ACPI_STATUS rv; 268 uint32_t count; 269 uint32_t i, j; 270 271 rv = acpi_eval_struct(sc->sc_node->ad_handle, "_PSS", &buf); 272 273 if (ACPI_FAILURE(rv)) 274 return rv; 275 276 obj = buf.Pointer; 277 278 if (obj->Type != ACPI_TYPE_PACKAGE) { 279 rv = AE_TYPE; 280 goto out; 281 } 282 283 sc->sc_pstate_count = obj->Package.Count; 284 285 if (sc->sc_pstate_count == 0) { 286 rv = AE_NOT_EXIST; 287 goto out; 288 } 289 290 if (sc->sc_pstate_count > ACPICPU_P_STATE_MAX) { 291 rv = AE_LIMIT; 292 goto out; 293 } 294 295 sc->sc_pstate = kmem_zalloc(sc->sc_pstate_count * 296 sizeof(struct acpicpu_pstate), KM_SLEEP); 297 298 if (sc->sc_pstate == NULL) { 299 rv = AE_NO_MEMORY; 300 goto out; 301 } 302 303 for (count = i = 0; i < sc->sc_pstate_count; i++) { 304 305 ps = &sc->sc_pstate[i]; 306 rv = acpicpu_pstate_pss_add(ps, &obj->Package.Elements[i]); 307 308 if (ACPI_FAILURE(rv)) 309 continue; 310 311 for (j = 0; j < i; j++) { 312 313 if (ps->ps_freq >= sc->sc_pstate[j].ps_freq) { 314 ps->ps_freq = 0; 315 break; 316 } 317 } 318 319 if (ps->ps_freq != 0) 320 count++; 321 } 322 323 rv = (count != 0) ? AE_OK : AE_NOT_EXIST; 324 325 out: 326 if (buf.Pointer != NULL) 327 ACPI_FREE(buf.Pointer); 328 329 return rv; 330 } 331 332 static ACPI_STATUS 333 acpicpu_pstate_pss_add(struct acpicpu_pstate *ps, ACPI_OBJECT *obj) 334 { 335 ACPI_OBJECT *elm; 336 uint32_t val[6]; 337 uint32_t *p; 338 int i; 339 340 if (obj->Type != ACPI_TYPE_PACKAGE) 341 return AE_TYPE; 342 343 if (obj->Package.Count != 6) 344 return AE_BAD_DATA; 345 346 elm = obj->Package.Elements; 347 348 for (i = 0; i < 6; i++) { 349 350 if (elm[i].Type != ACPI_TYPE_INTEGER) 351 return AE_TYPE; 352 353 if (elm[i].Integer.Value > UINT32_MAX) 354 return AE_AML_NUMERIC_OVERFLOW; 355 356 val[i] = elm[i].Integer.Value; 357 } 358 359 if (val[0] == 0 || val[0] >= 0xFFFF) 360 return AE_BAD_DECIMAL_CONSTANT; 361 362 CTASSERT(sizeof(val) == sizeof(struct acpicpu_pstate) - 363 offsetof(struct acpicpu_pstate, ps_freq)); 364 365 p = &ps->ps_freq; 366 367 for (i = 0; i < 6; i++, p++) 368 *p = val[i]; 369 370 /* 371 * The latency is typically around 10 usec 372 * on Intel CPUs. Use that as the minimum. 373 */ 374 if (ps->ps_latency < 10) 375 ps->ps_latency = 10; 376 377 return AE_OK; 378 } 379 380 ACPI_STATUS 381 acpicpu_pstate_pct(struct acpicpu_softc *sc) 382 { 383 static const size_t size = sizeof(struct acpicpu_reg); 384 struct acpicpu_reg *reg[2]; 385 ACPI_OBJECT *elm, *obj; 386 ACPI_BUFFER buf; 387 ACPI_STATUS rv; 388 uint8_t width; 389 int i; 390 391 rv = acpi_eval_struct(sc->sc_node->ad_handle, "_PCT", &buf); 392 393 if (ACPI_FAILURE(rv)) 394 return rv; 395 396 obj = buf.Pointer; 397 398 if (obj->Type != ACPI_TYPE_PACKAGE) { 399 rv = AE_TYPE; 400 goto out; 401 } 402 403 if (obj->Package.Count != 2) { 404 rv = AE_LIMIT; 405 goto out; 406 } 407 408 for (i = 0; i < 2; i++) { 409 410 elm = &obj->Package.Elements[i]; 411 412 if (elm->Type != ACPI_TYPE_BUFFER) { 413 rv = AE_TYPE; 414 goto out; 415 } 416 417 if (size > elm->Buffer.Length) { 418 rv = AE_AML_BAD_RESOURCE_LENGTH; 419 goto out; 420 } 421 422 reg[i] = (struct acpicpu_reg *)elm->Buffer.Pointer; 423 424 switch (reg[i]->reg_spaceid) { 425 426 case ACPI_ADR_SPACE_SYSTEM_IO: 427 428 if (reg[i]->reg_addr == 0) { 429 rv = AE_AML_ILLEGAL_ADDRESS; 430 goto out; 431 } 432 433 width = reg[i]->reg_bitwidth; 434 435 if (width + reg[i]->reg_bitoffset > 32) { 436 rv = AE_AML_BAD_RESOURCE_VALUE; 437 goto out; 438 } 439 440 if (width != 8 && width != 16 && width != 32) { 441 rv = AE_AML_BAD_RESOURCE_VALUE; 442 goto out; 443 } 444 445 break; 446 447 case ACPI_ADR_SPACE_FIXED_HARDWARE: 448 449 if ((sc->sc_flags & ACPICPU_FLAG_P_FFH) == 0) { 450 rv = AE_SUPPORT; 451 goto out; 452 } 453 454 break; 455 456 default: 457 rv = AE_AML_INVALID_SPACE_ID; 458 goto out; 459 } 460 } 461 462 if (reg[0]->reg_spaceid != reg[1]->reg_spaceid) { 463 rv = AE_AML_INVALID_SPACE_ID; 464 goto out; 465 } 466 467 (void)memcpy(&sc->sc_pstate_control, reg[0], size); /* PERF_CTRL */ 468 (void)memcpy(&sc->sc_pstate_status, reg[1], size); /* PERF_STATUS */ 469 470 out: 471 if (buf.Pointer != NULL) 472 ACPI_FREE(buf.Pointer); 473 474 return rv; 475 } 476 477 static int 478 acpicpu_pstate_max(struct acpicpu_softc *sc) 479 { 480 ACPI_INTEGER val; 481 ACPI_STATUS rv; 482 483 /* 484 * Evaluate the currently highest P-state that can be used. 485 * If available, we can use either this state or any lower 486 * power (i.e. higher numbered) state from the _PSS object. 487 */ 488 rv = acpi_eval_integer(sc->sc_node->ad_handle, "_PPC", &val); 489 490 sc->sc_pstate_max = 0; 491 492 if (ACPI_FAILURE(rv)) 493 return 1; 494 495 if (val > (uint64_t)sc->sc_pstate_count) 496 return 1; 497 498 if (sc->sc_pstate[val].ps_freq == 0) 499 return 1; 500 501 sc->sc_pstate_max = val; /* XXX: sysctl(8) knob? */ 502 503 return 0; 504 } 505 506 static void 507 acpicpu_pstate_change(struct acpicpu_softc *sc) 508 { 509 ACPI_OBJECT_LIST arg; 510 ACPI_OBJECT obj[2]; 511 512 arg.Count = 2; 513 arg.Pointer = obj; 514 515 obj[0].Type = ACPI_TYPE_INTEGER; 516 obj[1].Type = ACPI_TYPE_INTEGER; 517 518 obj[0].Integer.Value = ACPICPU_P_NOTIFY; 519 obj[1].Integer.Value = acpicpu_pstate_max(sc); 520 521 (void)AcpiEvaluateObject(sc->sc_node->ad_handle, "_OST", &arg, NULL); 522 } 523 524 static void 525 acpicpu_pstate_bios(void) 526 { 527 const uint8_t val = AcpiGbl_FADT.PstateControl; 528 const uint32_t addr = AcpiGbl_FADT.SmiCommand; 529 530 if (addr == 0) 531 return; 532 533 (void)AcpiOsWritePort(addr, val, 8); 534 } 535 536 int 537 acpicpu_pstate_get(struct acpicpu_softc *sc, uint32_t *freq) 538 { 539 const uint8_t method = sc->sc_pstate_control.reg_spaceid; 540 struct acpicpu_pstate *ps = NULL; 541 uint32_t i, val = 0; 542 uint64_t addr; 543 uint8_t width; 544 int rv; 545 546 if (sc->sc_cold != false) { 547 rv = EBUSY; 548 goto fail; 549 } 550 551 if ((sc->sc_flags & ACPICPU_FLAG_P) == 0) { 552 rv = ENODEV; 553 goto fail; 554 } 555 556 if (sc->sc_pstate_current != ACPICPU_P_STATE_UNKNOWN) { 557 *freq = sc->sc_pstate_current; 558 return 0; 559 } 560 561 switch (method) { 562 563 case ACPI_ADR_SPACE_FIXED_HARDWARE: 564 565 rv = acpicpu_md_pstate_get(sc, freq); 566 567 if (rv != 0) 568 goto fail; 569 570 break; 571 572 case ACPI_ADR_SPACE_SYSTEM_IO: 573 574 addr = sc->sc_pstate_status.reg_addr; 575 width = sc->sc_pstate_status.reg_bitwidth; 576 577 (void)AcpiOsReadPort(addr, &val, width); 578 579 if (val == 0) { 580 rv = EIO; 581 goto fail; 582 } 583 584 mutex_enter(&sc->sc_mtx); 585 586 for (i = 0; i < sc->sc_pstate_count; i++) { 587 588 if (sc->sc_pstate[i].ps_freq == 0) 589 continue; 590 591 if (val == sc->sc_pstate[i].ps_status) { 592 ps = &sc->sc_pstate[i]; 593 break; 594 } 595 } 596 597 mutex_exit(&sc->sc_mtx); 598 599 if (ps == NULL) { 600 rv = EIO; 601 goto fail; 602 } 603 604 *freq = ps->ps_freq; 605 break; 606 607 default: 608 rv = ENOTTY; 609 goto fail; 610 } 611 612 sc->sc_pstate_current = *freq; 613 614 return 0; 615 616 fail: 617 aprint_error_dev(sc->sc_dev, "failed " 618 "to get frequency (err %d)\n", rv); 619 620 *freq = sc->sc_pstate_current = ACPICPU_P_STATE_UNKNOWN; 621 622 return rv; 623 } 624 625 int 626 acpicpu_pstate_set(struct acpicpu_softc *sc, uint32_t freq) 627 { 628 const uint8_t method = sc->sc_pstate_control.reg_spaceid; 629 struct acpicpu_pstate *ps = NULL; 630 uint32_t i, val; 631 uint64_t addr; 632 uint8_t width; 633 int rv; 634 635 if (sc->sc_cold != false) { 636 rv = EBUSY; 637 goto fail; 638 } 639 640 if ((sc->sc_flags & ACPICPU_FLAG_P) == 0) { 641 rv = ENODEV; 642 goto fail; 643 } 644 645 mutex_enter(&sc->sc_mtx); 646 647 for (i = sc->sc_pstate_max; i < sc->sc_pstate_count; i++) { 648 649 if (sc->sc_pstate[i].ps_freq == 0) 650 continue; 651 652 if (sc->sc_pstate[i].ps_freq == freq) { 653 ps = &sc->sc_pstate[i]; 654 break; 655 } 656 } 657 658 mutex_exit(&sc->sc_mtx); 659 660 if (ps == NULL) { 661 rv = EINVAL; 662 goto fail; 663 } 664 665 switch (method) { 666 667 case ACPI_ADR_SPACE_FIXED_HARDWARE: 668 669 rv = acpicpu_md_pstate_set(ps); 670 671 if (rv != 0) 672 goto fail; 673 674 break; 675 676 case ACPI_ADR_SPACE_SYSTEM_IO: 677 678 addr = sc->sc_pstate_control.reg_addr; 679 width = sc->sc_pstate_control.reg_bitwidth; 680 681 (void)AcpiOsWritePort(addr, ps->ps_control, width); 682 683 addr = sc->sc_pstate_status.reg_addr; 684 width = sc->sc_pstate_status.reg_bitwidth; 685 686 /* 687 * Some systems take longer to respond 688 * than the reported worst-case latency. 689 */ 690 for (i = val = 0; i < ACPICPU_P_STATE_RETRY; i++) { 691 692 (void)AcpiOsReadPort(addr, &val, width); 693 694 if (val == ps->ps_status) 695 break; 696 697 DELAY(ps->ps_latency); 698 } 699 700 if (i == ACPICPU_P_STATE_RETRY) { 701 rv = EAGAIN; 702 goto fail; 703 } 704 705 break; 706 707 default: 708 rv = ENOTTY; 709 goto fail; 710 } 711 712 ps->ps_evcnt.ev_count++; 713 sc->sc_pstate_current = freq; 714 715 return 0; 716 717 fail: 718 aprint_error_dev(sc->sc_dev, "failed to set " 719 "frequency to %u (err %d)\n", freq, rv); 720 721 sc->sc_pstate_current = ACPICPU_P_STATE_UNKNOWN; 722 723 return rv; 724 } 725
Indexes created Tue Sep 30 20:09:53 GMT 2025