acpi_cpu_pstate.c revision 1.13
1 /* $NetBSD: acpi_cpu_pstate.c,v 1.13 2010/08/11 18:15:52 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 1.13 2010/08/11 18:15:52 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 ps->ps_freq = 0; 310 continue; 311 } 312 313 for (j = 0; j < i; j++) { 314 315 if (ps->ps_freq >= sc->sc_pstate[j].ps_freq) { 316 ps->ps_freq = 0; 317 break; 318 } 319 } 320 321 if (ps->ps_freq != 0) 322 count++; 323 } 324 325 rv = (count != 0) ? AE_OK : AE_NOT_EXIST; 326 327 out: 328 if (buf.Pointer != NULL) 329 ACPI_FREE(buf.Pointer); 330 331 return rv; 332 } 333 334 static ACPI_STATUS 335 acpicpu_pstate_pss_add(struct acpicpu_pstate *ps, ACPI_OBJECT *obj) 336 { 337 ACPI_OBJECT *elm; 338 uint32_t val[6]; 339 uint32_t *p; 340 int i; 341 342 if (obj->Type != ACPI_TYPE_PACKAGE) 343 return AE_TYPE; 344 345 if (obj->Package.Count != 6) 346 return AE_BAD_DATA; 347 348 elm = obj->Package.Elements; 349 350 for (i = 0; i < 6; i++) { 351 352 if (elm[i].Type != ACPI_TYPE_INTEGER) 353 return AE_TYPE; 354 355 if (elm[i].Integer.Value > UINT32_MAX) 356 return AE_AML_NUMERIC_OVERFLOW; 357 358 val[i] = elm[i].Integer.Value; 359 } 360 361 CTASSERT(sizeof(val) == sizeof(struct acpicpu_pstate) - 362 offsetof(struct acpicpu_pstate, ps_freq)); 363 364 p = &ps->ps_freq; 365 366 for (i = 0; i < 6; i++, p++) 367 *p = val[i]; 368 369 if (ps->ps_freq == 0 || ps->ps_freq > 9999) 370 return AE_BAD_DECIMAL_CONSTANT; 371 372 /* 373 * The latency is typically around 10 usec 374 * on Intel CPUs. Use that as the minimum. 375 */ 376 if (ps->ps_latency < 10) 377 ps->ps_latency = 10; 378 379 return AE_OK; 380 } 381 382 ACPI_STATUS 383 acpicpu_pstate_pct(struct acpicpu_softc *sc) 384 { 385 static const size_t size = sizeof(struct acpicpu_reg); 386 struct acpicpu_reg *reg[2]; 387 ACPI_OBJECT *elm, *obj; 388 ACPI_BUFFER buf; 389 ACPI_STATUS rv; 390 uint8_t width; 391 int i; 392 393 rv = acpi_eval_struct(sc->sc_node->ad_handle, "_PCT", &buf); 394 395 if (ACPI_FAILURE(rv)) 396 return rv; 397 398 obj = buf.Pointer; 399 400 if (obj->Type != ACPI_TYPE_PACKAGE) { 401 rv = AE_TYPE; 402 goto out; 403 } 404 405 if (obj->Package.Count != 2) { 406 rv = AE_LIMIT; 407 goto out; 408 } 409 410 for (i = 0; i < 2; i++) { 411 412 elm = &obj->Package.Elements[i]; 413 414 if (elm->Type != ACPI_TYPE_BUFFER) { 415 rv = AE_TYPE; 416 goto out; 417 } 418 419 if (size > elm->Buffer.Length) { 420 rv = AE_AML_BAD_RESOURCE_LENGTH; 421 goto out; 422 } 423 424 reg[i] = (struct acpicpu_reg *)elm->Buffer.Pointer; 425 426 switch (reg[i]->reg_spaceid) { 427 428 case ACPI_ADR_SPACE_SYSTEM_IO: 429 430 if (reg[i]->reg_addr == 0) { 431 rv = AE_AML_ILLEGAL_ADDRESS; 432 goto out; 433 } 434 435 width = reg[i]->reg_bitwidth; 436 437 if (width + reg[i]->reg_bitoffset > 32) { 438 rv = AE_AML_BAD_RESOURCE_VALUE; 439 goto out; 440 } 441 442 if (width != 8 && width != 16 && width != 32) { 443 rv = AE_AML_BAD_RESOURCE_VALUE; 444 goto out; 445 } 446 447 break; 448 449 case ACPI_ADR_SPACE_FIXED_HARDWARE: 450 451 if ((sc->sc_flags & ACPICPU_FLAG_P_FFH) == 0) { 452 rv = AE_SUPPORT; 453 goto out; 454 } 455 456 break; 457 458 default: 459 rv = AE_AML_INVALID_SPACE_ID; 460 goto out; 461 } 462 } 463 464 if (reg[0]->reg_spaceid != reg[1]->reg_spaceid) { 465 rv = AE_AML_INVALID_SPACE_ID; 466 goto out; 467 } 468 469 (void)memcpy(&sc->sc_pstate_control, reg[0], size); /* PERF_CTRL */ 470 (void)memcpy(&sc->sc_pstate_status, reg[1], size); /* PERF_STATUS */ 471 472 out: 473 if (buf.Pointer != NULL) 474 ACPI_FREE(buf.Pointer); 475 476 return rv; 477 } 478 479 static int 480 acpicpu_pstate_max(struct acpicpu_softc *sc) 481 { 482 ACPI_INTEGER val; 483 ACPI_STATUS rv; 484 485 /* 486 * Evaluate the currently highest P-state that can be used. 487 * If available, we can use either this state or any lower 488 * power (i.e. higher numbered) state from the _PSS object. 489 */ 490 rv = acpi_eval_integer(sc->sc_node->ad_handle, "_PPC", &val); 491 492 sc->sc_pstate_max = 0; 493 494 if (ACPI_FAILURE(rv)) 495 return 1; 496 497 if (val > (uint64_t)sc->sc_pstate_count) 498 return 1; 499 500 if (sc->sc_pstate[val].ps_freq == 0) 501 return 1; 502 503 sc->sc_pstate_max = val; /* XXX: sysctl(8) knob? */ 504 505 return 0; 506 } 507 508 static void 509 acpicpu_pstate_change(struct acpicpu_softc *sc) 510 { 511 ACPI_OBJECT_LIST arg; 512 ACPI_OBJECT obj[2]; 513 514 arg.Count = 2; 515 arg.Pointer = obj; 516 517 obj[0].Type = ACPI_TYPE_INTEGER; 518 obj[1].Type = ACPI_TYPE_INTEGER; 519 520 obj[0].Integer.Value = ACPICPU_P_NOTIFY; 521 obj[1].Integer.Value = acpicpu_pstate_max(sc); 522 523 (void)AcpiEvaluateObject(sc->sc_node->ad_handle, "_OST", &arg, NULL); 524 } 525 526 static void 527 acpicpu_pstate_bios(void) 528 { 529 const uint8_t val = AcpiGbl_FADT.PstateControl; 530 const uint32_t addr = AcpiGbl_FADT.SmiCommand; 531 532 if (addr == 0) 533 return; 534 535 (void)AcpiOsWritePort(addr, val, 8); 536 } 537 538 int 539 acpicpu_pstate_get(struct acpicpu_softc *sc, uint32_t *freq) 540 { 541 const uint8_t method = sc->sc_pstate_control.reg_spaceid; 542 struct acpicpu_pstate *ps = NULL; 543 uint32_t i, val = 0; 544 uint64_t addr; 545 uint8_t width; 546 int rv; 547 548 if (sc->sc_cold != false) { 549 rv = EBUSY; 550 goto fail; 551 } 552 553 if ((sc->sc_flags & ACPICPU_FLAG_P) == 0) { 554 rv = ENODEV; 555 goto fail; 556 } 557 558 if (sc->sc_pstate_current != ACPICPU_P_STATE_UNKNOWN) { 559 *freq = sc->sc_pstate_current; 560 return 0; 561 } 562 563 switch (method) { 564 565 case ACPI_ADR_SPACE_FIXED_HARDWARE: 566 567 rv = acpicpu_md_pstate_get(sc, freq); 568 569 if (rv != 0) 570 goto fail; 571 572 break; 573 574 case ACPI_ADR_SPACE_SYSTEM_IO: 575 576 addr = sc->sc_pstate_status.reg_addr; 577 width = sc->sc_pstate_status.reg_bitwidth; 578 579 (void)AcpiOsReadPort(addr, &val, width); 580 581 if (val == 0) { 582 rv = EIO; 583 goto fail; 584 } 585 586 mutex_enter(&sc->sc_mtx); 587 588 for (i = 0; i < sc->sc_pstate_count; i++) { 589 590 if (sc->sc_pstate[i].ps_freq == 0) 591 continue; 592 593 if (val == sc->sc_pstate[i].ps_status) { 594 ps = &sc->sc_pstate[i]; 595 break; 596 } 597 } 598 599 mutex_exit(&sc->sc_mtx); 600 601 if (ps == NULL) { 602 rv = EIO; 603 goto fail; 604 } 605 606 *freq = ps->ps_freq; 607 break; 608 609 default: 610 rv = ENOTTY; 611 goto fail; 612 } 613 614 sc->sc_pstate_current = *freq; 615 616 return 0; 617 618 fail: 619 aprint_error_dev(sc->sc_dev, "failed " 620 "to get frequency (err %d)\n", rv); 621 622 *freq = sc->sc_pstate_current = ACPICPU_P_STATE_UNKNOWN; 623 624 return rv; 625 } 626 627 int 628 acpicpu_pstate_set(struct acpicpu_softc *sc, uint32_t freq) 629 { 630 const uint8_t method = sc->sc_pstate_control.reg_spaceid; 631 struct acpicpu_pstate *ps = NULL; 632 uint32_t i, val; 633 uint64_t addr; 634 uint8_t width; 635 int rv; 636 637 if (sc->sc_cold != false) { 638 rv = EBUSY; 639 goto fail; 640 } 641 642 if ((sc->sc_flags & ACPICPU_FLAG_P) == 0) { 643 rv = ENODEV; 644 goto fail; 645 } 646 647 mutex_enter(&sc->sc_mtx); 648 649 for (i = sc->sc_pstate_max; i < sc->sc_pstate_count; i++) { 650 651 if (sc->sc_pstate[i].ps_freq == 0) 652 continue; 653 654 if (sc->sc_pstate[i].ps_freq == freq) { 655 ps = &sc->sc_pstate[i]; 656 break; 657 } 658 } 659 660 mutex_exit(&sc->sc_mtx); 661 662 if (ps == NULL) { 663 rv = EINVAL; 664 goto fail; 665 } 666 667 switch (method) { 668 669 case ACPI_ADR_SPACE_FIXED_HARDWARE: 670 671 rv = acpicpu_md_pstate_set(ps); 672 673 if (rv != 0) 674 goto fail; 675 676 break; 677 678 case ACPI_ADR_SPACE_SYSTEM_IO: 679 680 addr = sc->sc_pstate_control.reg_addr; 681 width = sc->sc_pstate_control.reg_bitwidth; 682 683 (void)AcpiOsWritePort(addr, ps->ps_control, width); 684 685 addr = sc->sc_pstate_status.reg_addr; 686 width = sc->sc_pstate_status.reg_bitwidth; 687 688 /* 689 * Some systems take longer to respond 690 * than the reported worst-case latency. 691 */ 692 for (i = val = 0; i < ACPICPU_P_STATE_RETRY; i++) { 693 694 (void)AcpiOsReadPort(addr, &val, width); 695 696 if (val == ps->ps_status) 697 break; 698 699 DELAY(ps->ps_latency); 700 } 701 702 if (i == ACPICPU_P_STATE_RETRY) { 703 rv = EAGAIN; 704 goto fail; 705 } 706 707 break; 708 709 default: 710 rv = ENOTTY; 711 goto fail; 712 } 713 714 ps->ps_evcnt.ev_count++; 715 sc->sc_pstate_current = freq; 716 717 return 0; 718 719 fail: 720 aprint_error_dev(sc->sc_dev, "failed to set " 721 "frequency to %u (err %d)\n", freq, rv); 722 723 sc->sc_pstate_current = ACPICPU_P_STATE_UNKNOWN; 724 725 return rv; 726 } 727
Indexes created Tue Sep 30 20:09:53 GMT 2025