acpi_cpu_pstate.c revision 1.9
1 /* $NetBSD: acpi_cpu_pstate.c,v 1.9 2010/08/11 11:48:21 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 1.9 2010/08/11 11:48:21 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 const char *str; 106 uint32_t i; 107 108 str = (method != ACPI_ADR_SPACE_SYSTEM_IO) ? "FFH" : "I/O"; 109 110 for (i = 0; i < sc->sc_pstate_count; i++) { 111 112 ps = &sc->sc_pstate[i]; 113 114 if (ps->ps_freq == 0) 115 continue; 116 117 aprint_debug_dev(sc->sc_dev, "P%d: %3s, " 118 "lat %3u us, pow %5u mW, %4u MHz\n", 119 i, str, ps->ps_latency, ps->ps_power, ps->ps_freq); 120 } 121 } 122 123 static void 124 acpicpu_pstate_attach_evcnt(struct acpicpu_softc *sc) 125 { 126 struct acpicpu_pstate *ps; 127 uint32_t i; 128 129 for (i = 0; i < sc->sc_pstate_count; i++) { 130 131 ps = &sc->sc_pstate[i]; 132 133 if (ps->ps_freq == 0) 134 continue; 135 136 (void)snprintf(ps->ps_name, sizeof(ps->ps_name), 137 "P%u (%u MHz)", i, ps->ps_freq); 138 139 evcnt_attach_dynamic(&ps->ps_evcnt, EVCNT_TYPE_MISC, 140 NULL, device_xname(sc->sc_dev), ps->ps_name); 141 } 142 } 143 144 int 145 acpicpu_pstate_detach(device_t self) 146 { 147 struct acpicpu_softc *sc = device_private(self); 148 static ONCE_DECL(once_detach); 149 size_t size; 150 int rv; 151 152 if ((sc->sc_flags & ACPICPU_FLAG_P) == 0) 153 return 0; 154 155 rv = RUN_ONCE(&once_detach, acpicpu_md_pstate_stop); 156 157 if (rv != 0) 158 return rv; 159 160 size = sc->sc_pstate_count * sizeof(*sc->sc_pstate); 161 162 if (sc->sc_pstate != NULL) 163 kmem_free(sc->sc_pstate, size); 164 165 sc->sc_flags &= ~ACPICPU_FLAG_P; 166 acpicpu_pstate_detach_evcnt(sc); 167 168 return 0; 169 } 170 171 static void 172 acpicpu_pstate_detach_evcnt(struct acpicpu_softc *sc) 173 { 174 struct acpicpu_pstate *ps; 175 uint32_t i; 176 177 for (i = 0; i < sc->sc_pstate_count; i++) { 178 179 ps = &sc->sc_pstate[i]; 180 181 if (ps->ps_freq != 0) 182 evcnt_detach(&ps->ps_evcnt); 183 } 184 } 185 186 int 187 acpicpu_pstate_start(device_t self) 188 { 189 struct acpicpu_softc *sc = device_private(self); 190 static ONCE_DECL(once_start); 191 192 if ((sc->sc_flags & ACPICPU_FLAG_P) == 0) 193 return 0; 194 195 return RUN_ONCE(&once_start, acpicpu_md_pstate_start); 196 } 197 198 bool 199 acpicpu_pstate_suspend(device_t self) 200 { 201 202 return true; 203 } 204 205 bool 206 acpicpu_pstate_resume(device_t self) 207 { 208 static const ACPI_OSD_EXEC_CALLBACK func = acpicpu_pstate_callback; 209 struct acpicpu_softc *sc = device_private(self); 210 211 KASSERT((sc->sc_flags & ACPICPU_FLAG_P) != 0); 212 213 if ((sc->sc_flags & ACPICPU_FLAG_P_PPC) != 0) 214 (void)AcpiOsExecute(OSL_NOTIFY_HANDLER, func, sc->sc_dev); 215 216 return true; 217 } 218 219 void 220 acpicpu_pstate_callback(void *aux) 221 { 222 struct acpicpu_softc *sc; 223 device_t self = aux; 224 uint32_t old, new; 225 226 sc = device_private(self); 227 228 if ((sc->sc_flags & ACPICPU_FLAG_P_PPC) == 0) 229 return; 230 231 mutex_enter(&sc->sc_mtx); 232 233 old = sc->sc_pstate_max; 234 acpicpu_pstate_change(sc); 235 new = sc->sc_pstate_max; 236 237 mutex_exit(&sc->sc_mtx); 238 239 #if 0 240 if (old != new) { 241 242 /* 243 * If the maximum changed, proactively 244 * raise or lower the target frequency. 245 */ 246 acpicpu_pstate_set(sc, sc->sc_pstate[new].ps_freq); 247 248 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "frequency changed from " 249 "%u MHz to %u MHz\n", sc->sc_pstate[old].ps_freq, 250 sc->sc_pstate[sc->sc_pstate_max].ps_freq)); 251 } 252 #endif 253 } 254 255 ACPI_STATUS 256 acpicpu_pstate_pss(struct acpicpu_softc *sc) 257 { 258 struct acpicpu_pstate *ps; 259 ACPI_OBJECT *obj; 260 ACPI_BUFFER buf; 261 ACPI_STATUS rv; 262 uint32_t count; 263 uint32_t i, j; 264 265 rv = acpi_eval_struct(sc->sc_node->ad_handle, "_PSS", &buf); 266 267 if (ACPI_FAILURE(rv)) 268 return rv; 269 270 obj = buf.Pointer; 271 272 if (obj->Type != ACPI_TYPE_PACKAGE) { 273 rv = AE_TYPE; 274 goto out; 275 } 276 277 sc->sc_pstate_count = obj->Package.Count; 278 279 if (sc->sc_pstate_count == 0) { 280 rv = AE_NOT_EXIST; 281 goto out; 282 } 283 284 if (sc->sc_pstate_count > ACPICPU_P_STATE_MAX) { 285 rv = AE_LIMIT; 286 goto out; 287 } 288 289 sc->sc_pstate = kmem_zalloc(sc->sc_pstate_count * 290 sizeof(struct acpicpu_pstate), KM_SLEEP); 291 292 if (sc->sc_pstate == NULL) { 293 rv = AE_NO_MEMORY; 294 goto out; 295 } 296 297 for (count = i = 0; i < sc->sc_pstate_count; i++) { 298 299 ps = &sc->sc_pstate[i]; 300 rv = acpicpu_pstate_pss_add(ps, &obj->Package.Elements[i]); 301 302 if (ACPI_FAILURE(rv)) 303 continue; 304 305 for (j = 0; j < i; j++) { 306 307 if (ps->ps_freq >= sc->sc_pstate[j].ps_freq) { 308 ps->ps_freq = 0; 309 break; 310 } 311 } 312 313 if (ps->ps_freq != 0) 314 count++; 315 } 316 317 rv = (count != 0) ? AE_OK : AE_NOT_EXIST; 318 319 out: 320 if (buf.Pointer != NULL) 321 ACPI_FREE(buf.Pointer); 322 323 return rv; 324 } 325 326 static ACPI_STATUS 327 acpicpu_pstate_pss_add(struct acpicpu_pstate *ps, ACPI_OBJECT *obj) 328 { 329 ACPI_OBJECT *elm; 330 uint32_t val[6]; 331 uint32_t *p; 332 int i; 333 334 if (obj->Type != ACPI_TYPE_PACKAGE) 335 return AE_TYPE; 336 337 if (obj->Package.Count != 6) 338 return AE_BAD_DATA; 339 340 elm = obj->Package.Elements; 341 342 for (i = 0; i < 6; i++) { 343 344 if (elm[i].Type != ACPI_TYPE_INTEGER) 345 return AE_TYPE; 346 347 if (elm[i].Integer.Value > UINT32_MAX) 348 return AE_AML_NUMERIC_OVERFLOW; 349 350 val[i] = elm[i].Integer.Value; 351 } 352 353 if (val[0] == 0 || val[0] >= 0xFFFF) 354 return AE_BAD_DECIMAL_CONSTANT; 355 356 CTASSERT(sizeof(val) == sizeof(struct acpicpu_pstate) - 357 offsetof(struct acpicpu_pstate, ps_freq)); 358 359 p = &ps->ps_freq; 360 361 for (i = 0; i < 6; i++, p++) 362 *p = val[i]; 363 364 /* 365 * The latency is typically around 10 usec 366 * on Intel CPUs. Use that as the minimum. 367 */ 368 if (ps->ps_latency < 10) 369 ps->ps_latency = 10; 370 371 return AE_OK; 372 } 373 374 ACPI_STATUS 375 acpicpu_pstate_pct(struct acpicpu_softc *sc) 376 { 377 static const size_t size = sizeof(struct acpicpu_reg); 378 struct acpicpu_reg *reg[2]; 379 ACPI_OBJECT *elm, *obj; 380 ACPI_BUFFER buf; 381 ACPI_STATUS rv; 382 uint8_t width; 383 int i; 384 385 rv = acpi_eval_struct(sc->sc_node->ad_handle, "_PCT", &buf); 386 387 if (ACPI_FAILURE(rv)) 388 return rv; 389 390 obj = buf.Pointer; 391 392 if (obj->Type != ACPI_TYPE_PACKAGE) { 393 rv = AE_TYPE; 394 goto out; 395 } 396 397 if (obj->Package.Count != 2) { 398 rv = AE_LIMIT; 399 goto out; 400 } 401 402 for (i = 0; i < 2; i++) { 403 404 elm = &obj->Package.Elements[i]; 405 406 if (elm->Type != ACPI_TYPE_BUFFER) { 407 rv = AE_TYPE; 408 goto out; 409 } 410 411 if (size > elm->Buffer.Length) { 412 rv = AE_AML_BAD_RESOURCE_LENGTH; 413 goto out; 414 } 415 416 reg[i] = (struct acpicpu_reg *)elm->Buffer.Pointer; 417 418 switch (reg[i]->reg_spaceid) { 419 420 case ACPI_ADR_SPACE_SYSTEM_IO: 421 422 if (reg[i]->reg_addr == 0) { 423 rv = AE_AML_ILLEGAL_ADDRESS; 424 goto out; 425 } 426 427 width = reg[i]->reg_bitwidth; 428 429 if (width != 8 && width != 16 && width != 32) { 430 rv = AE_AML_BAD_RESOURCE_VALUE; 431 goto out; 432 } 433 434 break; 435 436 case ACPI_ADR_SPACE_FIXED_HARDWARE: 437 438 if ((sc->sc_flags & ACPICPU_FLAG_P_FFH) == 0) { 439 rv = AE_SUPPORT; 440 goto out; 441 } 442 443 break; 444 445 default: 446 rv = AE_AML_INVALID_SPACE_ID; 447 goto out; 448 } 449 } 450 451 if (reg[0]->reg_spaceid != reg[1]->reg_spaceid) { 452 rv = AE_AML_INVALID_SPACE_ID; 453 goto out; 454 } 455 456 (void)memcpy(&sc->sc_pstate_control, reg[0], size); /* PERF_CTRL */ 457 (void)memcpy(&sc->sc_pstate_status, reg[1], size); /* PERF_STATUS */ 458 459 out: 460 if (buf.Pointer != NULL) 461 ACPI_FREE(buf.Pointer); 462 463 return rv; 464 } 465 466 static int 467 acpicpu_pstate_max(struct acpicpu_softc *sc) 468 { 469 ACPI_INTEGER val; 470 ACPI_STATUS rv; 471 472 /* 473 * Evaluate the currently highest P-state that can be used. 474 * If available, we can use either this state or any lower 475 * power (i.e. higher numbered) state from the _PSS object. 476 */ 477 rv = acpi_eval_integer(sc->sc_node->ad_handle, "_PPC", &val); 478 479 sc->sc_pstate_max = 0; 480 481 if (ACPI_FAILURE(rv)) 482 return 1; 483 484 if (val > (uint64_t)sc->sc_pstate_count) 485 return 1; 486 487 if (sc->sc_pstate[val].ps_freq == 0) 488 return 1; 489 490 sc->sc_pstate_max = val; /* XXX: sysctl(8) knob? */ 491 492 return 0; 493 } 494 495 static void 496 acpicpu_pstate_change(struct acpicpu_softc *sc) 497 { 498 ACPI_OBJECT_LIST arg; 499 ACPI_OBJECT obj[2]; 500 501 arg.Count = 2; 502 arg.Pointer = obj; 503 504 obj[0].Type = ACPI_TYPE_INTEGER; 505 obj[1].Type = ACPI_TYPE_INTEGER; 506 507 obj[0].Integer.Value = ACPICPU_P_NOTIFY; 508 obj[1].Integer.Value = acpicpu_pstate_max(sc); 509 510 (void)AcpiEvaluateObject(sc->sc_node->ad_handle, "_OST", &arg, NULL); 511 } 512 513 static void 514 acpicpu_pstate_bios(void) 515 { 516 const uint8_t val = AcpiGbl_FADT.PstateControl; 517 const uint32_t addr = AcpiGbl_FADT.SmiCommand; 518 519 if (addr == 0) 520 return; 521 522 (void)AcpiOsWritePort(addr, val, 8); 523 } 524 525 int 526 acpicpu_pstate_get(struct acpicpu_softc *sc, uint32_t *freq) 527 { 528 const uint8_t method = sc->sc_pstate_control.reg_spaceid; 529 struct acpicpu_pstate *ps = NULL; 530 uint32_t i, val = 0; 531 uint64_t addr; 532 uint8_t width; 533 int rv; 534 535 if ((sc->sc_flags & ACPICPU_FLAG_P) == 0) { 536 rv = ENODEV; 537 goto fail; 538 } 539 540 if (sc->sc_pstate_current != ACPICPU_P_STATE_UNKNOWN) { 541 *freq = sc->sc_pstate_current; 542 return 0; 543 } 544 545 switch (method) { 546 547 case ACPI_ADR_SPACE_FIXED_HARDWARE: 548 549 rv = acpicpu_md_pstate_get(sc, freq); 550 551 if (rv != 0) 552 goto fail; 553 554 break; 555 556 case ACPI_ADR_SPACE_SYSTEM_IO: 557 558 addr = sc->sc_pstate_status.reg_addr; 559 width = sc->sc_pstate_status.reg_bitwidth; 560 561 (void)AcpiOsReadPort(addr, &val, width); 562 563 if (val == 0) { 564 rv = EIO; 565 goto fail; 566 } 567 568 mutex_enter(&sc->sc_mtx); 569 570 for (i = 0; i < sc->sc_pstate_count; i++) { 571 572 if (sc->sc_pstate[i].ps_freq == 0) 573 continue; 574 575 if (val == sc->sc_pstate[i].ps_status) { 576 ps = &sc->sc_pstate[i]; 577 break; 578 } 579 } 580 581 mutex_exit(&sc->sc_mtx); 582 583 if (ps == NULL) { 584 rv = EIO; 585 goto fail; 586 } 587 588 *freq = ps->ps_freq; 589 break; 590 591 default: 592 rv = ENOTTY; 593 goto fail; 594 } 595 596 sc->sc_pstate_current = *freq; 597 598 return 0; 599 600 fail: 601 aprint_error_dev(sc->sc_dev, "failed " 602 "to get frequency (err %d)\n", rv); 603 604 *freq = sc->sc_pstate_current = ACPICPU_P_STATE_UNKNOWN; 605 606 return rv; 607 } 608 609 int 610 acpicpu_pstate_set(struct acpicpu_softc *sc, uint32_t freq) 611 { 612 const uint8_t method = sc->sc_pstate_control.reg_spaceid; 613 struct acpicpu_pstate *ps = NULL; 614 uint32_t i, val; 615 uint64_t addr; 616 uint8_t width; 617 int rv; 618 619 if ((sc->sc_flags & ACPICPU_FLAG_P) == 0) { 620 rv = ENODEV; 621 goto fail; 622 } 623 624 mutex_enter(&sc->sc_mtx); 625 626 for (i = sc->sc_pstate_max; i < sc->sc_pstate_count; i++) { 627 628 if (sc->sc_pstate[i].ps_freq == 0) 629 continue; 630 631 if (sc->sc_pstate[i].ps_freq == freq) { 632 ps = &sc->sc_pstate[i]; 633 break; 634 } 635 } 636 637 mutex_exit(&sc->sc_mtx); 638 639 if (ps == NULL) { 640 rv = EINVAL; 641 goto fail; 642 } 643 644 switch (method) { 645 646 case ACPI_ADR_SPACE_FIXED_HARDWARE: 647 648 rv = acpicpu_md_pstate_set(ps); 649 650 if (rv != 0) 651 goto fail; 652 653 break; 654 655 case ACPI_ADR_SPACE_SYSTEM_IO: 656 657 addr = sc->sc_pstate_control.reg_addr; 658 width = sc->sc_pstate_control.reg_bitwidth; 659 660 (void)AcpiOsWritePort(addr, ps->ps_control, width); 661 662 addr = sc->sc_pstate_status.reg_addr; 663 width = sc->sc_pstate_status.reg_bitwidth; 664 665 /* 666 * Some systems take longer to respond 667 * than the reported worst-case latency. 668 */ 669 for (i = val = 0; i < ACPICPU_P_STATE_RETRY; i++) { 670 671 (void)AcpiOsReadPort(addr, &val, width); 672 673 if (val == ps->ps_status) 674 break; 675 676 DELAY(ps->ps_latency); 677 } 678 679 if (i == ACPICPU_P_STATE_RETRY) { 680 rv = EAGAIN; 681 goto fail; 682 } 683 684 break; 685 686 default: 687 rv = ENOTTY; 688 goto fail; 689 } 690 691 ps->ps_evcnt.ev_count++; 692 sc->sc_pstate_current = freq; 693 694 return 0; 695 696 fail: 697 aprint_error_dev(sc->sc_dev, "failed to set " 698 "frequency to %u (err %d)\n", freq, rv); 699 700 sc->sc_pstate_current = ACPICPU_P_STATE_UNKNOWN; 701 702 return rv; 703 } 704
Indexes created Tue Sep 30 20:09:53 GMT 2025