| 1 | /* $NetBSD: acpi_cpu_tstate.c,v 1.32 2013/11/20 13:39:59 jruoho Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2010 Jukka Ruohonen <jruohonen@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_tstate.c,v 1.32 2013/11/20 13:39:59 jruoho Exp $" ); |
| 31 | |
| 32 | #include <sys/param.h> |
| 33 | #include <sys/kmem.h> |
| 34 | #include <sys/xcall.h> |
| 35 | |
| 36 | #include <dev/acpi/acpireg.h> |
| 37 | #include <dev/acpi/acpivar.h> |
| 38 | #include <dev/acpi/acpi_cpu.h> |
| 39 | |
| 40 | #define _COMPONENT ACPI_BUS_COMPONENT |
| 41 | ACPI_MODULE_NAME ("acpi_cpu_tstate" ) |
| 42 | |
| 43 | static ACPI_STATUS acpicpu_tstate_tss(struct acpicpu_softc *); |
| 44 | static ACPI_STATUS acpicpu_tstate_tss_add(struct acpicpu_tstate *, |
| 45 | ACPI_OBJECT *); |
| 46 | static ACPI_STATUS acpicpu_tstate_ptc(struct acpicpu_softc *); |
| 47 | static ACPI_STATUS acpicpu_tstate_dep(struct acpicpu_softc *); |
| 48 | static ACPI_STATUS acpicpu_tstate_fadt(struct acpicpu_softc *); |
| 49 | static ACPI_STATUS acpicpu_tstate_change(struct acpicpu_softc *); |
| 50 | static void acpicpu_tstate_reset(struct acpicpu_softc *); |
| 51 | static void acpicpu_tstate_set_xcall(void *, void *); |
| 52 | |
| 53 | extern struct acpicpu_softc **acpicpu_sc; |
| 54 | |
| 55 | void |
| 56 | acpicpu_tstate_attach(device_t self) |
| 57 | { |
| 58 | struct acpicpu_softc *sc = device_private(self); |
| 59 | const char *str; |
| 60 | ACPI_HANDLE tmp; |
| 61 | ACPI_STATUS rv; |
| 62 | |
| 63 | /* |
| 64 | * Disable T-states for PIIX4. |
| 65 | */ |
| 66 | if ((sc->sc_flags & ACPICPU_FLAG_PIIX4) != 0) |
| 67 | return; |
| 68 | |
| 69 | rv = acpicpu_tstate_tss(sc); |
| 70 | |
| 71 | if (ACPI_FAILURE(rv)) { |
| 72 | str = "_TSS" ; |
| 73 | goto out; |
| 74 | } |
| 75 | |
| 76 | rv = acpicpu_tstate_ptc(sc); |
| 77 | |
| 78 | if (ACPI_FAILURE(rv)) { |
| 79 | str = "_PTC" ; |
| 80 | goto out; |
| 81 | } |
| 82 | |
| 83 | /* |
| 84 | * Query the optional _TSD. |
| 85 | */ |
| 86 | rv = acpicpu_tstate_dep(sc); |
| 87 | |
| 88 | if (ACPI_SUCCESS(rv)) |
| 89 | sc->sc_flags |= ACPICPU_FLAG_T_DEP; |
| 90 | |
| 91 | /* |
| 92 | * Comparable to P-states, the _TPC object may |
| 93 | * be absent in some systems, even though it is |
| 94 | * required by ACPI 3.0 along with _TSS and _PTC. |
| 95 | */ |
| 96 | rv = AcpiGetHandle(sc->sc_node->ad_handle, "_TPC" , &tmp); |
| 97 | |
| 98 | if (ACPI_FAILURE(rv)) { |
| 99 | aprint_debug_dev(self, "_TPC missing\n" ); |
| 100 | rv = AE_OK; |
| 101 | } |
| 102 | |
| 103 | out: |
| 104 | if (ACPI_FAILURE(rv)) { |
| 105 | |
| 106 | if (rv != AE_NOT_FOUND) |
| 107 | aprint_error_dev(sc->sc_dev, "failed to evaluate " |
| 108 | "%s: %s\n" , str, AcpiFormatException(rv)); |
| 109 | |
| 110 | rv = acpicpu_tstate_fadt(sc); |
| 111 | |
| 112 | if (ACPI_FAILURE(rv)) |
| 113 | return; |
| 114 | |
| 115 | sc->sc_flags |= ACPICPU_FLAG_T_FADT; |
| 116 | } |
| 117 | |
| 118 | sc->sc_flags |= ACPICPU_FLAG_T; |
| 119 | |
| 120 | acpicpu_tstate_reset(sc); |
| 121 | } |
| 122 | |
| 123 | void |
| 124 | acpicpu_tstate_detach(device_t self) |
| 125 | { |
| 126 | struct acpicpu_softc *sc = device_private(self); |
| 127 | size_t size; |
| 128 | |
| 129 | if ((sc->sc_flags & ACPICPU_FLAG_T) == 0) |
| 130 | return; |
| 131 | |
| 132 | size = sc->sc_tstate_count * sizeof(*sc->sc_tstate); |
| 133 | |
| 134 | if (sc->sc_tstate != NULL) |
| 135 | kmem_free(sc->sc_tstate, size); |
| 136 | |
| 137 | sc->sc_flags &= ~ACPICPU_FLAG_T; |
| 138 | } |
| 139 | |
| 140 | void |
| 141 | acpicpu_tstate_start(device_t self) |
| 142 | { |
| 143 | /* Nothing. */ |
| 144 | } |
| 145 | |
| 146 | void |
| 147 | acpicpu_tstate_suspend(void *aux) |
| 148 | { |
| 149 | struct acpicpu_softc *sc; |
| 150 | device_t self = aux; |
| 151 | |
| 152 | sc = device_private(self); |
| 153 | |
| 154 | mutex_enter(&sc->sc_mtx); |
| 155 | acpicpu_tstate_reset(sc); |
| 156 | mutex_exit(&sc->sc_mtx); |
| 157 | } |
| 158 | |
| 159 | void |
| 160 | acpicpu_tstate_resume(void *aux) |
| 161 | { |
| 162 | /* Nothing. */ |
| 163 | } |
| 164 | |
| 165 | void |
| 166 | acpicpu_tstate_callback(void *aux) |
| 167 | { |
| 168 | struct acpicpu_softc *sc; |
| 169 | device_t self = aux; |
| 170 | uint32_t omax, omin; |
| 171 | int i; |
| 172 | |
| 173 | sc = device_private(self); |
| 174 | |
| 175 | if ((sc->sc_flags & ACPICPU_FLAG_T_FADT) != 0) |
| 176 | return; |
| 177 | |
| 178 | mutex_enter(&sc->sc_mtx); |
| 179 | |
| 180 | /* |
| 181 | * If P-states are in use, we should ignore |
| 182 | * the interrupt unless we are in the highest |
| 183 | * P-state (see ACPI 4.0, section 8.4.3.3). |
| 184 | */ |
| 185 | if ((sc->sc_flags & ACPICPU_FLAG_P) != 0) { |
| 186 | |
| 187 | for (i = sc->sc_pstate_count - 1; i >= 0; i--) { |
| 188 | |
| 189 | if (sc->sc_pstate[i].ps_freq != 0) |
| 190 | break; |
| 191 | } |
| 192 | |
| 193 | if (sc->sc_pstate_current != sc->sc_pstate[i].ps_freq) { |
| 194 | mutex_exit(&sc->sc_mtx); |
| 195 | return; |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | omax = sc->sc_tstate_max; |
| 200 | omin = sc->sc_tstate_min; |
| 201 | |
| 202 | (void)acpicpu_tstate_change(sc); |
| 203 | |
| 204 | if (omax != sc->sc_tstate_max || omin != sc->sc_tstate_min) { |
| 205 | |
| 206 | aprint_debug_dev(sc->sc_dev, "throttling window " |
| 207 | "changed from %u-%u %% to %u-%u %%\n" , |
| 208 | sc->sc_tstate[omax].ts_percent, |
| 209 | sc->sc_tstate[omin].ts_percent, |
| 210 | sc->sc_tstate[sc->sc_tstate_max].ts_percent, |
| 211 | sc->sc_tstate[sc->sc_tstate_min].ts_percent); |
| 212 | } |
| 213 | |
| 214 | mutex_exit(&sc->sc_mtx); |
| 215 | } |
| 216 | |
| 217 | static ACPI_STATUS |
| 218 | acpicpu_tstate_tss(struct acpicpu_softc *sc) |
| 219 | { |
| 220 | struct acpicpu_tstate *ts; |
| 221 | ACPI_OBJECT *obj; |
| 222 | ACPI_BUFFER buf; |
| 223 | ACPI_STATUS rv; |
| 224 | uint32_t count; |
| 225 | uint32_t i, j; |
| 226 | |
| 227 | rv = acpi_eval_struct(sc->sc_node->ad_handle, "_TSS" , &buf); |
| 228 | |
| 229 | if (ACPI_FAILURE(rv)) |
| 230 | return rv; |
| 231 | |
| 232 | obj = buf.Pointer; |
| 233 | |
| 234 | if (obj->Type != ACPI_TYPE_PACKAGE) { |
| 235 | rv = AE_TYPE; |
| 236 | goto out; |
| 237 | } |
| 238 | |
| 239 | sc->sc_tstate_count = obj->Package.Count; |
| 240 | |
| 241 | if (sc->sc_tstate_count == 0) { |
| 242 | rv = AE_NOT_EXIST; |
| 243 | goto out; |
| 244 | } |
| 245 | |
| 246 | sc->sc_tstate = kmem_zalloc(sc->sc_tstate_count * |
| 247 | sizeof(struct acpicpu_tstate), KM_SLEEP); |
| 248 | |
| 249 | if (sc->sc_tstate == NULL) { |
| 250 | rv = AE_NO_MEMORY; |
| 251 | goto out; |
| 252 | } |
| 253 | |
| 254 | for (count = i = 0; i < sc->sc_tstate_count; i++) { |
| 255 | |
| 256 | ts = &sc->sc_tstate[i]; |
| 257 | rv = acpicpu_tstate_tss_add(ts, &obj->Package.Elements[i]); |
| 258 | |
| 259 | if (ACPI_FAILURE(rv)) { |
| 260 | ts->ts_percent = 0; |
| 261 | continue; |
| 262 | } |
| 263 | |
| 264 | for (j = 0; j < i; j++) { |
| 265 | |
| 266 | if (ts->ts_percent >= sc->sc_tstate[j].ts_percent) { |
| 267 | ts->ts_percent = 0; |
| 268 | break; |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | if (ts->ts_percent != 0) |
| 273 | count++; |
| 274 | } |
| 275 | |
| 276 | if (count == 0) { |
| 277 | rv = AE_NOT_EXIST; |
| 278 | goto out; |
| 279 | } |
| 280 | |
| 281 | /* |
| 282 | * There must be an entry with the percent |
| 283 | * field of 100. If this is not true, and if |
| 284 | * this entry is not in the expected index, |
| 285 | * invalidate the use of T-states via _TSS. |
| 286 | */ |
| 287 | if (sc->sc_tstate[0].ts_percent != 100) { |
| 288 | rv = AE_BAD_DECIMAL_CONSTANT; |
| 289 | goto out; |
| 290 | } |
| 291 | |
| 292 | out: |
| 293 | if (buf.Pointer != NULL) |
| 294 | ACPI_FREE(buf.Pointer); |
| 295 | |
| 296 | return rv; |
| 297 | } |
| 298 | |
| 299 | static ACPI_STATUS |
| 300 | acpicpu_tstate_tss_add(struct acpicpu_tstate *ts, ACPI_OBJECT *obj) |
| 301 | { |
| 302 | ACPI_OBJECT *elm; |
| 303 | uint32_t val[5]; |
| 304 | uint32_t *p; |
| 305 | int i; |
| 306 | |
| 307 | if (obj->Type != ACPI_TYPE_PACKAGE) |
| 308 | return AE_TYPE; |
| 309 | |
| 310 | if (obj->Package.Count != 5) |
| 311 | return AE_BAD_DATA; |
| 312 | |
| 313 | elm = obj->Package.Elements; |
| 314 | |
| 315 | for (i = 0; i < 5; i++) { |
| 316 | |
| 317 | if (elm[i].Type != ACPI_TYPE_INTEGER) |
| 318 | return AE_TYPE; |
| 319 | |
| 320 | if (elm[i].Integer.Value > UINT32_MAX) |
| 321 | return AE_AML_NUMERIC_OVERFLOW; |
| 322 | |
| 323 | val[i] = elm[i].Integer.Value; |
| 324 | } |
| 325 | |
| 326 | p = &ts->ts_percent; |
| 327 | |
| 328 | for (i = 0; i < 5; i++, p++) |
| 329 | *p = val[i]; |
| 330 | |
| 331 | /* |
| 332 | * The minimum should be either 12.5 % or 6.5 %, |
| 333 | * the latter 4-bit dynamic range being available |
| 334 | * in some newer models; see Section 14.5.3.1 in |
| 335 | * |
| 336 | * Intel 64 and IA-32 Architectures Software |
| 337 | * Developer's Manual. Volume 3B, Part 2. 2013. |
| 338 | */ |
| 339 | if (ts->ts_percent < 6 || ts->ts_percent > 100) |
| 340 | return AE_BAD_DECIMAL_CONSTANT; |
| 341 | |
| 342 | if (ts->ts_latency == 0 || ts->ts_latency > 1000) |
| 343 | ts->ts_latency = 1; |
| 344 | |
| 345 | return AE_OK; |
| 346 | } |
| 347 | |
| 348 | ACPI_STATUS |
| 349 | acpicpu_tstate_ptc(struct acpicpu_softc *sc) |
| 350 | { |
| 351 | static const size_t size = sizeof(struct acpicpu_reg); |
| 352 | struct acpicpu_reg *reg[2]; |
| 353 | ACPI_OBJECT *elm, *obj; |
| 354 | ACPI_BUFFER buf; |
| 355 | ACPI_STATUS rv; |
| 356 | int i; |
| 357 | |
| 358 | rv = acpi_eval_struct(sc->sc_node->ad_handle, "_PTC" , &buf); |
| 359 | |
| 360 | if (ACPI_FAILURE(rv)) |
| 361 | return rv; |
| 362 | |
| 363 | obj = buf.Pointer; |
| 364 | |
| 365 | if (obj->Type != ACPI_TYPE_PACKAGE) { |
| 366 | rv = AE_TYPE; |
| 367 | goto out; |
| 368 | } |
| 369 | |
| 370 | if (obj->Package.Count != 2) { |
| 371 | rv = AE_LIMIT; |
| 372 | goto out; |
| 373 | } |
| 374 | |
| 375 | for (i = 0; i < 2; i++) { |
| 376 | |
| 377 | elm = &obj->Package.Elements[i]; |
| 378 | |
| 379 | if (elm->Type != ACPI_TYPE_BUFFER) { |
| 380 | rv = AE_TYPE; |
| 381 | goto out; |
| 382 | } |
| 383 | |
| 384 | if (size > elm->Buffer.Length) { |
| 385 | rv = AE_AML_BAD_RESOURCE_LENGTH; |
| 386 | goto out; |
| 387 | } |
| 388 | |
| 389 | reg[i] = (struct acpicpu_reg *)elm->Buffer.Pointer; |
| 390 | |
| 391 | switch (reg[i]->reg_spaceid) { |
| 392 | |
| 393 | case ACPI_ADR_SPACE_SYSTEM_IO: |
| 394 | |
| 395 | if (reg[i]->reg_addr == 0) { |
| 396 | rv = AE_AML_ILLEGAL_ADDRESS; |
| 397 | goto out; |
| 398 | } |
| 399 | |
| 400 | /* |
| 401 | * Check that the values match the IA32 clock |
| 402 | * modulation MSR, where the bit 0 is reserved, |
| 403 | * bits 1 through 3 define the duty cycle, and |
| 404 | * the fourth bit enables the modulation. |
| 405 | */ |
| 406 | if (reg[i]->reg_bitwidth != 4) { |
| 407 | rv = AE_AML_BAD_RESOURCE_VALUE; |
| 408 | goto out; |
| 409 | } |
| 410 | |
| 411 | if (reg[i]->reg_bitoffset != 1) { |
| 412 | rv = AE_AML_BAD_RESOURCE_VALUE; |
| 413 | goto out; |
| 414 | } |
| 415 | |
| 416 | break; |
| 417 | |
| 418 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
| 419 | |
| 420 | if ((sc->sc_flags & ACPICPU_FLAG_T_FFH) == 0) { |
| 421 | rv = AE_SUPPORT; |
| 422 | goto out; |
| 423 | } |
| 424 | |
| 425 | break; |
| 426 | |
| 427 | default: |
| 428 | rv = AE_AML_INVALID_SPACE_ID; |
| 429 | goto out; |
| 430 | } |
| 431 | } |
| 432 | |
| 433 | if (reg[0]->reg_spaceid != reg[1]->reg_spaceid) { |
| 434 | rv = AE_AML_INVALID_SPACE_ID; |
| 435 | goto out; |
| 436 | } |
| 437 | |
| 438 | (void)memcpy(&sc->sc_tstate_control, reg[0], size); |
| 439 | (void)memcpy(&sc->sc_tstate_status, reg[1], size); |
| 440 | |
| 441 | out: |
| 442 | if (buf.Pointer != NULL) |
| 443 | ACPI_FREE(buf.Pointer); |
| 444 | |
| 445 | return rv; |
| 446 | } |
| 447 | |
| 448 | static ACPI_STATUS |
| 449 | acpicpu_tstate_dep(struct acpicpu_softc *sc) |
| 450 | { |
| 451 | ACPI_OBJECT *elm, *obj; |
| 452 | ACPI_BUFFER buf; |
| 453 | ACPI_STATUS rv; |
| 454 | uint32_t val; |
| 455 | uint8_t i, n; |
| 456 | |
| 457 | rv = acpi_eval_struct(sc->sc_node->ad_handle, "_TSD" , &buf); |
| 458 | |
| 459 | if (ACPI_FAILURE(rv)) |
| 460 | goto out; |
| 461 | |
| 462 | obj = buf.Pointer; |
| 463 | |
| 464 | if (obj->Type != ACPI_TYPE_PACKAGE) { |
| 465 | rv = AE_TYPE; |
| 466 | goto out; |
| 467 | } |
| 468 | |
| 469 | if (obj->Package.Count != 1) { |
| 470 | rv = AE_LIMIT; |
| 471 | goto out; |
| 472 | } |
| 473 | |
| 474 | elm = &obj->Package.Elements[0]; |
| 475 | |
| 476 | if (obj->Type != ACPI_TYPE_PACKAGE) { |
| 477 | rv = AE_TYPE; |
| 478 | goto out; |
| 479 | } |
| 480 | |
| 481 | n = elm->Package.Count; |
| 482 | |
| 483 | if (n != 5) { |
| 484 | rv = AE_LIMIT; |
| 485 | goto out; |
| 486 | } |
| 487 | |
| 488 | elm = elm->Package.Elements; |
| 489 | |
| 490 | for (i = 0; i < n; i++) { |
| 491 | |
| 492 | if (elm[i].Type != ACPI_TYPE_INTEGER) { |
| 493 | rv = AE_TYPE; |
| 494 | goto out; |
| 495 | } |
| 496 | |
| 497 | if (elm[i].Integer.Value > UINT32_MAX) { |
| 498 | rv = AE_AML_NUMERIC_OVERFLOW; |
| 499 | goto out; |
| 500 | } |
| 501 | } |
| 502 | |
| 503 | val = elm[1].Integer.Value; |
| 504 | |
| 505 | if (val != 0) |
| 506 | aprint_debug_dev(sc->sc_dev, "invalid revision in _TSD\n" ); |
| 507 | |
| 508 | val = elm[3].Integer.Value; |
| 509 | |
| 510 | if (val < ACPICPU_DEP_SW_ALL || val > ACPICPU_DEP_HW_ALL) { |
| 511 | rv = AE_AML_BAD_RESOURCE_VALUE; |
| 512 | goto out; |
| 513 | } |
| 514 | |
| 515 | val = elm[4].Integer.Value; |
| 516 | |
| 517 | if (val > sc->sc_ncpus) { |
| 518 | rv = AE_BAD_VALUE; |
| 519 | goto out; |
| 520 | } |
| 521 | |
| 522 | sc->sc_tstate_dep.dep_domain = elm[2].Integer.Value; |
| 523 | sc->sc_tstate_dep.dep_type = elm[3].Integer.Value; |
| 524 | sc->sc_tstate_dep.dep_ncpus = elm[4].Integer.Value; |
| 525 | |
| 526 | out: |
| 527 | if (ACPI_FAILURE(rv) && rv != AE_NOT_FOUND) |
| 528 | aprint_debug_dev(sc->sc_dev, "failed to evaluate " |
| 529 | "_TSD: %s\n" , AcpiFormatException(rv)); |
| 530 | |
| 531 | if (buf.Pointer != NULL) |
| 532 | ACPI_FREE(buf.Pointer); |
| 533 | |
| 534 | return rv; |
| 535 | } |
| 536 | |
| 537 | static ACPI_STATUS |
| 538 | acpicpu_tstate_fadt(struct acpicpu_softc *sc) |
| 539 | { |
| 540 | static const size_t size = sizeof(struct acpicpu_tstate); |
| 541 | const uint8_t offset = AcpiGbl_FADT.DutyOffset; |
| 542 | const uint8_t width = AcpiGbl_FADT.DutyWidth; |
| 543 | uint8_t beta, count, i; |
| 544 | |
| 545 | if (sc->sc_object.ao_pblkaddr == 0) |
| 546 | return AE_AML_ILLEGAL_ADDRESS; |
| 547 | |
| 548 | /* |
| 549 | * A zero DUTY_WIDTH may be used announce |
| 550 | * that T-states are not available via FADT |
| 551 | * (ACPI 4.0, p. 121). See also (section 9.3): |
| 552 | * |
| 553 | * Advanced Micro Devices: BIOS and Kernel |
| 554 | * Developer's Guide for AMD Athlon 64 and |
| 555 | * AMD Opteron Processors. Revision 3.30, |
| 556 | * February 2006. |
| 557 | */ |
| 558 | if (width == 0 || width + offset > 4) |
| 559 | return AE_AML_BAD_RESOURCE_VALUE; |
| 560 | |
| 561 | count = 1 << width; |
| 562 | |
| 563 | if (sc->sc_tstate != NULL) |
| 564 | kmem_free(sc->sc_tstate, sc->sc_tstate_count * size); |
| 565 | |
| 566 | sc->sc_tstate = kmem_zalloc(count * size, KM_SLEEP); |
| 567 | |
| 568 | if (sc->sc_tstate == NULL) |
| 569 | return ENOMEM; |
| 570 | |
| 571 | sc->sc_tstate_count = count; |
| 572 | |
| 573 | /* |
| 574 | * Approximate duty cycles and set the MSR values. |
| 575 | */ |
| 576 | for (beta = 100 / count, i = 0; i < count; i++) { |
| 577 | sc->sc_tstate[i].ts_percent = 100 - beta * i; |
| 578 | sc->sc_tstate[i].ts_latency = 1; |
| 579 | } |
| 580 | |
| 581 | for (i = 1; i < count; i++) |
| 582 | sc->sc_tstate[i].ts_control = (count - i) | __BIT(3); |
| 583 | |
| 584 | /* |
| 585 | * Fake values for throttling registers. |
| 586 | */ |
| 587 | (void)memset(&sc->sc_tstate_status, 0, sizeof(struct acpicpu_reg)); |
| 588 | (void)memset(&sc->sc_tstate_control, 0, sizeof(struct acpicpu_reg)); |
| 589 | |
| 590 | sc->sc_tstate_status.reg_bitwidth = width; |
| 591 | sc->sc_tstate_status.reg_bitoffset = offset; |
| 592 | sc->sc_tstate_status.reg_addr = sc->sc_object.ao_pblkaddr; |
| 593 | sc->sc_tstate_status.reg_spaceid = ACPI_ADR_SPACE_SYSTEM_IO; |
| 594 | |
| 595 | sc->sc_tstate_control.reg_bitwidth = width; |
| 596 | sc->sc_tstate_control.reg_bitoffset = offset; |
| 597 | sc->sc_tstate_control.reg_addr = sc->sc_object.ao_pblkaddr; |
| 598 | sc->sc_tstate_control.reg_spaceid = ACPI_ADR_SPACE_SYSTEM_IO; |
| 599 | |
| 600 | return AE_OK; |
| 601 | } |
| 602 | |
| 603 | static ACPI_STATUS |
| 604 | acpicpu_tstate_change(struct acpicpu_softc *sc) |
| 605 | { |
| 606 | ACPI_INTEGER val; |
| 607 | ACPI_STATUS rv; |
| 608 | |
| 609 | acpicpu_tstate_reset(sc); |
| 610 | |
| 611 | /* |
| 612 | * Evaluate the available T-state window: |
| 613 | * |
| 614 | * _TPC : either this maximum or any lower power |
| 615 | * (i.e. higher numbered) state may be used. |
| 616 | * |
| 617 | * _TDL : either this minimum or any higher power |
| 618 | * (i.e. lower numbered) state may be used. |
| 619 | * |
| 620 | * _TDL >= _TPC || _TDL >= _TSS[last entry]. |
| 621 | */ |
| 622 | rv = acpi_eval_integer(sc->sc_node->ad_handle, "_TPC" , &val); |
| 623 | |
| 624 | if (ACPI_SUCCESS(rv) && val < sc->sc_tstate_count) { |
| 625 | |
| 626 | if (sc->sc_tstate[val].ts_percent != 0) |
| 627 | sc->sc_tstate_max = val; |
| 628 | } |
| 629 | |
| 630 | rv = acpi_eval_integer(sc->sc_node->ad_handle, "_TDL" , &val); |
| 631 | |
| 632 | if (ACPI_SUCCESS(rv) && val < sc->sc_tstate_count) { |
| 633 | |
| 634 | if (val >= sc->sc_tstate_max && |
| 635 | sc->sc_tstate[val].ts_percent != 0) |
| 636 | sc->sc_tstate_min = val; |
| 637 | } |
| 638 | |
| 639 | return AE_OK; |
| 640 | } |
| 641 | |
| 642 | static void |
| 643 | acpicpu_tstate_reset(struct acpicpu_softc *sc) |
| 644 | { |
| 645 | |
| 646 | sc->sc_tstate_max = 0; |
| 647 | sc->sc_tstate_min = sc->sc_tstate_count - 1; |
| 648 | } |
| 649 | |
| 650 | int |
| 651 | acpicpu_tstate_get(struct cpu_info *ci, uint32_t *percent) |
| 652 | { |
| 653 | struct acpicpu_tstate *ts = NULL; |
| 654 | struct acpicpu_softc *sc; |
| 655 | uint32_t i, val = 0; |
| 656 | uint8_t offset; |
| 657 | uint64_t addr; |
| 658 | int rv; |
| 659 | |
| 660 | sc = acpicpu_sc[ci->ci_acpiid]; |
| 661 | |
| 662 | if (__predict_false(sc == NULL)) { |
| 663 | rv = ENXIO; |
| 664 | goto fail; |
| 665 | } |
| 666 | |
| 667 | if (__predict_false(sc->sc_cold != false)) { |
| 668 | rv = EBUSY; |
| 669 | goto fail; |
| 670 | } |
| 671 | |
| 672 | if (__predict_false((sc->sc_flags & ACPICPU_FLAG_T) == 0)) { |
| 673 | rv = ENODEV; |
| 674 | goto fail; |
| 675 | } |
| 676 | |
| 677 | mutex_enter(&sc->sc_mtx); |
| 678 | |
| 679 | if (sc->sc_tstate_current != ACPICPU_T_STATE_UNKNOWN) { |
| 680 | *percent = sc->sc_tstate_current; |
| 681 | mutex_exit(&sc->sc_mtx); |
| 682 | return 0; |
| 683 | } |
| 684 | |
| 685 | mutex_exit(&sc->sc_mtx); |
| 686 | |
| 687 | switch (sc->sc_tstate_status.reg_spaceid) { |
| 688 | |
| 689 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
| 690 | |
| 691 | rv = acpicpu_md_tstate_get(sc, percent); |
| 692 | |
| 693 | if (__predict_false(rv != 0)) |
| 694 | goto fail; |
| 695 | |
| 696 | break; |
| 697 | |
| 698 | case ACPI_ADR_SPACE_SYSTEM_IO: |
| 699 | |
| 700 | addr = sc->sc_tstate_status.reg_addr; |
| 701 | offset = sc->sc_tstate_status.reg_bitoffset; |
| 702 | |
| 703 | (void)AcpiOsReadPort(addr, &val, 8); |
| 704 | |
| 705 | val = (val >> offset) & 0x0F; |
| 706 | |
| 707 | for (i = 0; i < sc->sc_tstate_count; i++) { |
| 708 | |
| 709 | if (sc->sc_tstate[i].ts_percent == 0) |
| 710 | continue; |
| 711 | |
| 712 | if (val == sc->sc_tstate[i].ts_status) { |
| 713 | ts = &sc->sc_tstate[i]; |
| 714 | break; |
| 715 | } |
| 716 | } |
| 717 | |
| 718 | if (ts == NULL) { |
| 719 | rv = EIO; |
| 720 | goto fail; |
| 721 | } |
| 722 | |
| 723 | *percent = ts->ts_percent; |
| 724 | break; |
| 725 | |
| 726 | default: |
| 727 | rv = ENOTTY; |
| 728 | goto fail; |
| 729 | } |
| 730 | |
| 731 | mutex_enter(&sc->sc_mtx); |
| 732 | sc->sc_tstate_current = *percent; |
| 733 | mutex_exit(&sc->sc_mtx); |
| 734 | |
| 735 | return 0; |
| 736 | |
| 737 | fail: |
| 738 | aprint_error_dev(sc->sc_dev, "failed " |
| 739 | "to get T-state (err %d)\n" , rv); |
| 740 | |
| 741 | mutex_enter(&sc->sc_mtx); |
| 742 | *percent = sc->sc_tstate_current = ACPICPU_T_STATE_UNKNOWN; |
| 743 | mutex_exit(&sc->sc_mtx); |
| 744 | |
| 745 | return rv; |
| 746 | } |
| 747 | |
| 748 | void |
| 749 | acpicpu_tstate_set(struct cpu_info *ci, uint32_t percent) |
| 750 | { |
| 751 | uint64_t xc; |
| 752 | |
| 753 | xc = xc_broadcast(0, acpicpu_tstate_set_xcall, &percent, NULL); |
| 754 | xc_wait(xc); |
| 755 | } |
| 756 | |
| 757 | static void |
| 758 | acpicpu_tstate_set_xcall(void *arg1, void *arg2) |
| 759 | { |
| 760 | struct acpicpu_tstate *ts = NULL; |
| 761 | struct cpu_info *ci = curcpu(); |
| 762 | struct acpicpu_softc *sc; |
| 763 | uint32_t i, percent, val; |
| 764 | uint8_t offset; |
| 765 | uint64_t addr; |
| 766 | int rv; |
| 767 | |
| 768 | percent = *(uint32_t *)arg1; |
| 769 | sc = acpicpu_sc[ci->ci_acpiid]; |
| 770 | |
| 771 | if (__predict_false(sc == NULL)) { |
| 772 | rv = ENXIO; |
| 773 | goto fail; |
| 774 | } |
| 775 | |
| 776 | if (__predict_false(sc->sc_cold != false)) { |
| 777 | rv = EBUSY; |
| 778 | goto fail; |
| 779 | } |
| 780 | |
| 781 | if (__predict_false((sc->sc_flags & ACPICPU_FLAG_T) == 0)) { |
| 782 | rv = ENODEV; |
| 783 | goto fail; |
| 784 | } |
| 785 | |
| 786 | mutex_enter(&sc->sc_mtx); |
| 787 | |
| 788 | if (sc->sc_tstate_current == percent) { |
| 789 | mutex_exit(&sc->sc_mtx); |
| 790 | return; |
| 791 | } |
| 792 | |
| 793 | for (i = sc->sc_tstate_max; i <= sc->sc_tstate_min; i++) { |
| 794 | |
| 795 | if (__predict_false(sc->sc_tstate[i].ts_percent == 0)) |
| 796 | continue; |
| 797 | |
| 798 | if (sc->sc_tstate[i].ts_percent == percent) { |
| 799 | ts = &sc->sc_tstate[i]; |
| 800 | break; |
| 801 | } |
| 802 | } |
| 803 | |
| 804 | mutex_exit(&sc->sc_mtx); |
| 805 | |
| 806 | if (__predict_false(ts == NULL)) { |
| 807 | rv = EINVAL; |
| 808 | goto fail; |
| 809 | } |
| 810 | |
| 811 | switch (sc->sc_tstate_control.reg_spaceid) { |
| 812 | |
| 813 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
| 814 | |
| 815 | rv = acpicpu_md_tstate_set(ts); |
| 816 | |
| 817 | if (__predict_false(rv != 0)) |
| 818 | goto fail; |
| 819 | |
| 820 | break; |
| 821 | |
| 822 | case ACPI_ADR_SPACE_SYSTEM_IO: |
| 823 | |
| 824 | addr = sc->sc_tstate_control.reg_addr; |
| 825 | offset = sc->sc_tstate_control.reg_bitoffset; |
| 826 | |
| 827 | val = (ts->ts_control & 0x0F) << offset; |
| 828 | |
| 829 | if (ts->ts_percent != 100 && (val & __BIT(4)) == 0) { |
| 830 | rv = EINVAL; |
| 831 | goto fail; |
| 832 | } |
| 833 | |
| 834 | (void)AcpiOsWritePort(addr, val, 8); |
| 835 | |
| 836 | /* |
| 837 | * If the status field is zero, the transition is |
| 838 | * specified to be "asynchronous" and there is no |
| 839 | * need to check the status (ACPI 4.0, 8.4.3.2). |
| 840 | */ |
| 841 | if (ts->ts_status == 0) |
| 842 | break; |
| 843 | |
| 844 | addr = sc->sc_tstate_status.reg_addr; |
| 845 | offset = sc->sc_tstate_status.reg_bitoffset; |
| 846 | |
| 847 | for (i = val = 0; i < ACPICPU_T_STATE_RETRY; i++) { |
| 848 | |
| 849 | (void)AcpiOsReadPort(addr, &val, 8); |
| 850 | |
| 851 | val = (val >> offset) & 0x0F; |
| 852 | |
| 853 | if (val == ts->ts_status) |
| 854 | break; |
| 855 | |
| 856 | DELAY(ts->ts_latency); |
| 857 | } |
| 858 | |
| 859 | if (i == ACPICPU_T_STATE_RETRY) { |
| 860 | rv = EAGAIN; |
| 861 | goto fail; |
| 862 | } |
| 863 | |
| 864 | break; |
| 865 | |
| 866 | default: |
| 867 | rv = ENOTTY; |
| 868 | goto fail; |
| 869 | } |
| 870 | |
| 871 | mutex_enter(&sc->sc_mtx); |
| 872 | ts->ts_evcnt.ev_count++; |
| 873 | sc->sc_tstate_current = percent; |
| 874 | mutex_exit(&sc->sc_mtx); |
| 875 | |
| 876 | return; |
| 877 | |
| 878 | fail: |
| 879 | if (rv != EINVAL) |
| 880 | aprint_error_dev(sc->sc_dev, "failed to " |
| 881 | "throttle to %u %% (err %d)\n" , percent, rv); |
| 882 | |
| 883 | mutex_enter(&sc->sc_mtx); |
| 884 | sc->sc_tstate_current = ACPICPU_T_STATE_UNKNOWN; |
| 885 | mutex_exit(&sc->sc_mtx); |
| 886 | } |
| 887 | |