Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/acpi_perf.c
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1 /*- 2 * Copyright (c) 2003-2005 Nate Lawson (SDG) 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD: src/sys/dev/acpica/acpi_perf.c,v 1.21.4.1 2005/07/21 08:50:26 bruno Exp $"); 29 30 #include "opt_acpi.h" 31 #include <sys/param.h> 32 #include <sys/kernel.h> 33 #include <sys/proc.h> 34 #include <sys/sched.h> 35 #include <sys/bus.h> 36 #include <sys/cpu.h> 37 #include <sys/power.h> 38 #include <sys/malloc.h> 39 #include <sys/module.h> 40 #include <sys/sbuf.h> 41 #include <sys/pcpu.h> 42 43 #include <machine/bus.h> 44 #include <machine/resource.h> 45 #include <sys/rman.h> 46 47 #include "acpi.h" 48 #include <dev/acpica/acpivar.h> 49 50 #include "cpufreq_if.h" 51 52 /* 53 * Support for ACPI processor performance states (Px) according to 54 * section 8.3.3 of the ACPI 2.0c specification. 55 */ 56 57 struct acpi_px { 58 uint32_t core_freq; 59 uint32_t power; 60 uint32_t trans_lat; 61 uint32_t bm_lat; 62 uint32_t ctrl_val; 63 uint32_t sts_val; 64 }; 65 66 /* Offsets in struct cf_setting array for storing driver-specific values. */ 67 #define PX_SPEC_CONTROL 0 68 #define PX_SPEC_STATUS 1 69 70 #define MAX_PX_STATES 16 71 72 struct acpi_perf_softc { 73 device_t dev; 74 ACPI_HANDLE handle; 75 struct resource *perf_ctrl; /* Set new performance state. */ 76 int perf_ctrl_type; /* Resource type for perf_ctrl. */ 77 struct resource *perf_status; /* Check that transition succeeded. */ 78 int perf_sts_type; /* Resource type for perf_status. */ 79 struct acpi_px *px_states; /* ACPI perf states. */ 80 uint32_t px_count; /* Total number of perf states. */ 81 uint32_t px_max_avail; /* Lowest index state available. */ 82 int px_curr_state; /* Active state index. */ 83 int px_rid; 84 int info_only; /* Can we set new states? */ 85 }; 86 87 #define PX_GET_REG(reg) \ 88 (bus_space_read_4(rman_get_bustag((reg)), \ 89 rman_get_bushandle((reg)), 0)) 90 #define PX_SET_REG(reg, val) \ 91 (bus_space_write_4(rman_get_bustag((reg)), \ 92 rman_get_bushandle((reg)), 0, (val))) 93 94 #define ACPI_NOTIFY_PERF_STATES 0x80 /* _PSS changed. */ 95 96 static void acpi_perf_identify(driver_t *driver, device_t parent); 97 static int acpi_perf_probe(device_t dev); 98 static int acpi_perf_attach(device_t dev); 99 static int acpi_perf_detach(device_t dev); 100 static int acpi_perf_evaluate(device_t dev); 101 static int acpi_px_to_set(device_t dev, struct acpi_px *px, 102 struct cf_setting *set); 103 static void acpi_px_available(struct acpi_perf_softc *sc); 104 static void acpi_px_startup(void *arg); 105 static void acpi_px_notify(ACPI_HANDLE h, UINT32 notify, void *context); 106 static int acpi_px_settings(device_t dev, struct cf_setting *sets, 107 int *count); 108 static int acpi_px_set(device_t dev, const struct cf_setting *set); 109 static int acpi_px_get(device_t dev, struct cf_setting *set); 110 static int acpi_px_type(device_t dev, int *type); 111 112 static device_method_t acpi_perf_methods[] = { 113 /* Device interface */ 114 DEVMETHOD(device_identify, acpi_perf_identify), 115 DEVMETHOD(device_probe, acpi_perf_probe), 116 DEVMETHOD(device_attach, acpi_perf_attach), 117 DEVMETHOD(device_detach, acpi_perf_detach), 118 119 /* cpufreq interface */ 120 DEVMETHOD(cpufreq_drv_set, acpi_px_set), 121 DEVMETHOD(cpufreq_drv_get, acpi_px_get), 122 DEVMETHOD(cpufreq_drv_type, acpi_px_type), 123 DEVMETHOD(cpufreq_drv_settings, acpi_px_settings), 124 {0, 0} 125 }; 126 127 static driver_t acpi_perf_driver = { 128 "acpi_perf", 129 acpi_perf_methods, 130 sizeof(struct acpi_perf_softc), 131 }; 132 133 static devclass_t acpi_perf_devclass; 134 DRIVER_MODULE(acpi_perf, cpu, acpi_perf_driver, acpi_perf_devclass, 0, 0); 135 MODULE_DEPEND(acpi_perf, acpi, 1, 1, 1); 136 137 MALLOC_DEFINE(M_ACPIPERF, "acpi_perf", "ACPI Performance states"); 138 139 static void 140 acpi_perf_identify(driver_t *driver, device_t parent) 141 { 142 ACPI_HANDLE handle; 143 device_t dev; 144 145 /* Make sure we're not being doubly invoked. */ 146 if (device_find_child(parent, "acpi_perf", -1) != NULL) 147 return; 148 149 /* Get the handle for the Processor object and check for perf states. */ 150 handle = acpi_get_handle(parent); 151 if (handle == NULL) 152 return; 153 if (ACPI_FAILURE(AcpiEvaluateObject(handle, "_PSS", NULL, NULL))) 154 return; 155 156 /* 157 * Add a child to every CPU that has the right methods. In future 158 * versions of the ACPI spec, CPUs can have different settings. 159 * We probe this child now so that other devices that depend 160 * on it (i.e., for info about supported states) will see it. 161 */ 162 if ((dev = BUS_ADD_CHILD(parent, 0, "acpi_perf", -1)) != NULL) 163 device_probe_and_attach(dev); 164 else 165 device_printf(parent, "add acpi_perf child failed\n"); 166 } 167 168 static int 169 acpi_perf_probe(device_t dev) 170 { 171 ACPI_HANDLE handle; 172 ACPI_OBJECT *pkg; 173 struct resource *res; 174 ACPI_BUFFER buf; 175 int error, rid, type; 176 177 if (resource_disabled("acpi_perf", 0)) 178 return (ENXIO); 179 180 /* 181 * Check the performance state registers. If they are of type 182 * "functional fixed hardware", we attach quietly since we will 183 * only be providing information on settings to other drivers. 184 */ 185 error = ENXIO; 186 handle = acpi_get_handle(dev); 187 buf.Pointer = NULL; 188 buf.Length = ACPI_ALLOCATE_BUFFER; 189 if (ACPI_FAILURE(AcpiEvaluateObject(handle, "_PCT", NULL, &buf))) 190 return (error); 191 pkg = (ACPI_OBJECT *)buf.Pointer; 192 if (ACPI_PKG_VALID(pkg, 2)) { 193 rid = 0; 194 error = acpi_PkgGas(dev, pkg, 0, &type, &rid, &res); 195 switch (error) { 196 case 0: 197 bus_release_resource(dev, type, rid, res); 198 bus_delete_resource(dev, type, rid); 199 device_set_desc(dev, "ACPI CPU Frequency Control"); 200 break; 201 case EOPNOTSUPP: 202 device_quiet(dev); 203 error = 0; 204 break; 205 } 206 } 207 AcpiOsFree(buf.Pointer); 208 209 return (error); 210 } 211 212 static int 213 acpi_perf_attach(device_t dev) 214 { 215 struct acpi_perf_softc *sc; 216 217 sc = device_get_softc(dev); 218 sc->dev = dev; 219 sc->handle = acpi_get_handle(dev); 220 sc->px_max_avail = 0; 221 sc->px_curr_state = CPUFREQ_VAL_UNKNOWN; 222 if (acpi_perf_evaluate(dev) != 0) 223 return (ENXIO); 224 AcpiOsQueueForExecution(OSD_PRIORITY_LO, acpi_px_startup, NULL); 225 if (!sc->info_only) 226 cpufreq_register(dev); 227 228 return (0); 229 } 230 231 static int 232 acpi_perf_detach(device_t dev) 233 { 234 /* TODO: teardown registers, remove notify handler. */ 235 return (ENXIO); 236 } 237 238 /* Probe and setup any valid performance states (Px). */ 239 static int 240 acpi_perf_evaluate(device_t dev) 241 { 242 struct acpi_perf_softc *sc; 243 ACPI_BUFFER buf; 244 ACPI_OBJECT *pkg, *res; 245 ACPI_STATUS status; 246 int count, error, i, j; 247 uint32_t *p; 248 249 /* Get the control values and parameters for each state. */ 250 error = ENXIO; 251 sc = device_get_softc(dev); 252 buf.Pointer = NULL; 253 buf.Length = ACPI_ALLOCATE_BUFFER; 254 status = AcpiEvaluateObject(sc->handle, "_PSS", NULL, &buf); 255 if (ACPI_FAILURE(status)) 256 return (ENXIO); 257 258 pkg = (ACPI_OBJECT *)buf.Pointer; 259 if (!ACPI_PKG_VALID(pkg, 1)) { 260 device_printf(dev, "invalid top level _PSS package\n"); 261 goto out; 262 } 263 sc->px_count = pkg->Package.Count; 264 265 sc->px_states = malloc(sc->px_count * sizeof(struct acpi_px), 266 M_ACPIPERF, M_WAITOK | M_ZERO); 267 if (sc->px_states == NULL) 268 goto out; 269 270 /* 271 * Each state is a package of {CoreFreq, Power, TransitionLatency, 272 * BusMasterLatency, ControlVal, StatusVal}, sorted from highest 273 * performance to lowest. 274 */ 275 count = 0; 276 for (i = 0; i < sc->px_count; i++) { 277 res = &pkg->Package.Elements[i]; 278 if (!ACPI_PKG_VALID(res, 6)) { 279 device_printf(dev, "invalid _PSS package\n"); 280 continue; 281 } 282 283 /* Parse the rest of the package into the struct. */ 284 p = &sc->px_states[count].core_freq; 285 for (j = 0; j < 6; j++, p++) 286 acpi_PkgInt32(res, j, p); 287 288 /* 289 * Check for some impossible frequencies that some systems 290 * use to indicate they don't actually support this Px state. 291 */ 292 if (sc->px_states[count].core_freq == 0 || 293 sc->px_states[count].core_freq == 9999 || 294 sc->px_states[count].core_freq == 0x9999 || 295 sc->px_states[count].core_freq >= 0xffff) 296 continue; 297 298 count++; 299 } 300 sc->px_count = count; 301 302 /* No valid Px state found so give up. */ 303 if (count == 0) 304 goto out; 305 AcpiOsFree(buf.Pointer); 306 307 /* Get the control and status registers (one of each). */ 308 buf.Pointer = NULL; 309 buf.Length = ACPI_ALLOCATE_BUFFER; 310 status = AcpiEvaluateObject(sc->handle, "_PCT", NULL, &buf); 311 if (ACPI_FAILURE(status)) 312 goto out; 313 314 /* Check the package of two registers, each a Buffer in GAS format. */ 315 pkg = (ACPI_OBJECT *)buf.Pointer; 316 if (!ACPI_PKG_VALID(pkg, 2)) { 317 device_printf(dev, "invalid perf register package\n"); 318 goto out; 319 } 320 321 error = acpi_PkgGas(sc->dev, pkg, 0, &sc->perf_ctrl_type, &sc->px_rid, 322 &sc->perf_ctrl); 323 if (error) { 324 /* 325 * If the register is of type FFixedHW, we can only return 326 * info, we can't get or set new settings. 327 */ 328 if (error == EOPNOTSUPP) { 329 sc->info_only = TRUE; 330 error = 0; 331 } else 332 device_printf(dev, "failed in PERF_CTL attach\n"); 333 goto out; 334 } 335 sc->px_rid++; 336 337 error = acpi_PkgGas(sc->dev, pkg, 1, &sc->perf_sts_type, &sc->px_rid, 338 &sc->perf_status); 339 if (error) { 340 if (error == EOPNOTSUPP) { 341 sc->info_only = TRUE; 342 error = 0; 343 } else 344 device_printf(dev, "failed in PERF_STATUS attach\n"); 345 goto out; 346 } 347 sc->px_rid++; 348 349 /* Get our current limit and register for notifies. */ 350 acpi_px_available(sc); 351 AcpiInstallNotifyHandler(sc->handle, ACPI_DEVICE_NOTIFY, 352 acpi_px_notify, sc); 353 error = 0; 354 355 out: 356 if (error) { 357 if (sc->px_states) { 358 free(sc->px_states, M_ACPIPERF); 359 sc->px_states = NULL; 360 } 361 if (sc->perf_ctrl) { 362 bus_release_resource(sc->dev, sc->perf_ctrl_type, 0, 363 sc->perf_ctrl); 364 bus_delete_resource(sc->dev, sc->perf_ctrl_type, 0); 365 sc->perf_ctrl = NULL; 366 } 367 if (sc->perf_status) { 368 bus_release_resource(sc->dev, sc->perf_sts_type, 1, 369 sc->perf_status); 370 bus_delete_resource(sc->dev, sc->perf_sts_type, 1); 371 sc->perf_status = NULL; 372 } 373 sc->px_rid = 0; 374 sc->px_count = 0; 375 } 376 if (buf.Pointer) 377 AcpiOsFree(buf.Pointer); 378 return (error); 379 } 380 381 static void 382 acpi_px_startup(void *arg) 383 { 384 385 /* Signal to the platform that we are taking over CPU control. */ 386 if (AcpiGbl_FADT->PstateCnt == 0) 387 return; 388 ACPI_LOCK(acpi); 389 AcpiOsWritePort(AcpiGbl_FADT->SmiCmd, AcpiGbl_FADT->PstateCnt, 8); 390 ACPI_UNLOCK(acpi); 391 } 392 393 static void 394 acpi_px_notify(ACPI_HANDLE h, UINT32 notify, void *context) 395 { 396 struct acpi_perf_softc *sc; 397 398 sc = context; 399 if (notify != ACPI_NOTIFY_PERF_STATES) 400 return; 401 402 acpi_px_available(sc); 403 404 /* TODO: Implement notification when frequency changes. */ 405 } 406 407 /* 408 * Find the highest currently-supported performance state. 409 * This can be called at runtime (e.g., due to a docking event) at 410 * the request of a Notify on the processor object. 411 */ 412 static void 413 acpi_px_available(struct acpi_perf_softc *sc) 414 { 415 ACPI_STATUS status; 416 struct cf_setting set; 417 418 status = acpi_GetInteger(sc->handle, "_PPC", &sc->px_max_avail); 419 420 /* If the old state is too high, set current state to the new max. */ 421 if (ACPI_SUCCESS(status)) { 422 if (sc->px_curr_state != CPUFREQ_VAL_UNKNOWN && 423 sc->px_curr_state > sc->px_max_avail) { 424 acpi_px_to_set(sc->dev, 425 &sc->px_states[sc->px_max_avail], &set); 426 acpi_px_set(sc->dev, &set); 427 } 428 } else 429 sc->px_max_avail = 0; 430 } 431 432 static int 433 acpi_px_to_set(device_t dev, struct acpi_px *px, struct cf_setting *set) 434 { 435 436 if (px == NULL || set == NULL) 437 return (EINVAL); 438 439 set->freq = px->core_freq; 440 set->power = px->power; 441 /* XXX Include BM latency too? */ 442 set->lat = px->trans_lat; 443 set->volts = CPUFREQ_VAL_UNKNOWN; 444 set->dev = dev; 445 set->spec[PX_SPEC_CONTROL] = px->ctrl_val; 446 set->spec[PX_SPEC_STATUS] = px->sts_val; 447 448 return (0); 449 } 450 451 static int 452 acpi_px_settings(device_t dev, struct cf_setting *sets, int *count) 453 { 454 struct acpi_perf_softc *sc; 455 int x, y; 456 457 sc = device_get_softc(dev); 458 if (sets == NULL || count == NULL) 459 return (EINVAL); 460 if (*count < sc->px_count - sc->px_max_avail) 461 return (E2BIG); 462 463 /* Return a list of settings that are currently valid. */ 464 y = 0; 465 for (x = sc->px_max_avail; x < sc->px_count; x++, y++) 466 acpi_px_to_set(dev, &sc->px_states[x], &sets[y]); 467 *count = sc->px_count - sc->px_max_avail; 468 469 return (0); 470 } 471 472 static int 473 acpi_px_set(device_t dev, const struct cf_setting *set) 474 { 475 struct acpi_perf_softc *sc; 476 int i, status, sts_val, tries; 477 478 if (set == NULL) 479 return (EINVAL); 480 sc = device_get_softc(dev); 481 482 /* If we can't set new states, return immediately. */ 483 if (sc->info_only) 484 return (ENXIO); 485 486 /* Look up appropriate state, based on frequency. */ 487 for (i = sc->px_max_avail; i < sc->px_count; i++) { 488 if (CPUFREQ_CMP(set->freq, sc->px_states[i].core_freq)) 489 break; 490 } 491 if (i == sc->px_count) 492 return (EINVAL); 493 494 /* Write the appropriate value to the register. */ 495 PX_SET_REG(sc->perf_ctrl, sc->px_states[i].ctrl_val); 496 497 /* 498 * Try for up to 10 ms to verify the desired state was selected. 499 * This is longer than the standard says (1 ms) but in some modes, 500 * systems may take longer to respond. 501 */ 502 sts_val = sc->px_states[i].sts_val; 503 for (tries = 0; tries < 1000; tries++) { 504 status = PX_GET_REG(sc->perf_status); 505 506 /* 507 * If we match the status or the desired status is 8 bits 508 * and matches the relevant bits, assume we succeeded. It 509 * appears some systems (IBM R32) expect byte-wide access 510 * even though the standard says the register is 32-bit. 511 */ 512 if (status == sts_val || 513 ((sts_val & ~0xff) == 0 && (status & 0xff) == sts_val)) 514 break; 515 DELAY(10); 516 } 517 if (tries == 1000) { 518 device_printf(dev, "Px transition to %d failed\n", 519 sc->px_states[i].core_freq); 520 return (ENXIO); 521 } 522 sc->px_curr_state = i; 523 524 return (0); 525 } 526 527 static int 528 acpi_px_get(device_t dev, struct cf_setting *set) 529 { 530 struct acpi_perf_softc *sc; 531 uint64_t rate; 532 int i; 533 struct pcpu *pc; 534 535 if (set == NULL) 536 return (EINVAL); 537 sc = device_get_softc(dev); 538 539 /* If we can't get new states, return immediately. */ 540 if (sc->info_only) 541 return (ENXIO); 542 543 /* If we've set the rate before, use the cached value. */ 544 if (sc->px_curr_state != CPUFREQ_VAL_UNKNOWN) { 545 acpi_px_to_set(dev, &sc->px_states[sc->px_curr_state], set); 546 return (0); 547 } 548 549 /* Otherwise, estimate and try to match against our settings. */ 550 pc = cpu_get_pcpu(dev); 551 if (pc == NULL) 552 return (ENXIO); 553 cpu_est_clockrate(pc->pc_cpuid, &rate); 554 rate /= 1000000; 555 for (i = 0; i < sc->px_count; i++) { 556 if (CPUFREQ_CMP(sc->px_states[i].core_freq, rate)) { 557 sc->px_curr_state = i; 558 acpi_px_to_set(dev, &sc->px_states[i], set); 559 break; 560 } 561 } 562 563 /* No match, give up. */ 564 if (i == sc->px_count) { 565 sc->px_curr_state = CPUFREQ_VAL_UNKNOWN; 566 set->freq = CPUFREQ_VAL_UNKNOWN; 567 } 568 569 return (0); 570 } 571 572 static int 573 acpi_px_type(device_t dev, int *type) 574 { 575 struct acpi_perf_softc *sc; 576 577 if (type == NULL) 578 return (EINVAL); 579 sc = device_get_softc(dev); 580 581 *type = CPUFREQ_TYPE_ABSOLUTE; 582 if (sc->info_only) 583 *type |= CPUFREQ_FLAG_INFO_ONLY; 584 return (0); 585 }
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