1/*- 2 * Copyright (c) 2003-2005 Nate Lawson (SDG) 3 * Copyright (c) 2001 Michael Smith 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28#include <sys/cdefs.h> 29#include "opt_acpi.h" 30#include <sys/param.h> 31#include <sys/bus.h> 32#include <sys/cpu.h> 33#include <sys/kernel.h> 34#include <sys/malloc.h> 35#include <sys/module.h> 36#include <sys/pcpu.h> 37#include <sys/power.h> 38#include <sys/proc.h> 39#include <sys/sched.h> 40#include <sys/sbuf.h> 41#include <sys/smp.h> 42 43#include <dev/pci/pcivar.h> 44#include <machine/atomic.h> 45#include <machine/bus.h> 46#if defined(__amd64__) || defined(__i386__) 47#include <machine/clock.h> 48#include <machine/specialreg.h> 49#include <machine/md_var.h> 50#endif 51#include <sys/rman.h> 52 53#include <contrib/dev/acpica/include/acpi.h> 54#include <contrib/dev/acpica/include/accommon.h> 55 56#include <dev/acpica/acpivar.h> 57 58/* 59 * Support for ACPI Processor devices, including C[1-3] sleep states. 60 */ 61 62/* Hooks for the ACPI CA debugging infrastructure */ 63#define _COMPONENT ACPI_PROCESSOR 64ACPI_MODULE_NAME("PROCESSOR") 65 66struct acpi_cx { 67 struct resource *p_lvlx; /* Register to read to enter state. */ 68 uint32_t type; /* C1-3 (C4 and up treated as C3). */ 69 uint32_t trans_lat; /* Transition latency (usec). */ 70 uint32_t power; /* Power consumed (mW). */ 71 int res_type; /* Resource type for p_lvlx. */ 72 int res_rid; /* Resource ID for p_lvlx. */ 73 bool do_mwait; 74 uint32_t mwait_hint; 75 bool mwait_hw_coord; 76 bool mwait_bm_avoidance; 77}; 78#define MAX_CX_STATES 8 79 80struct acpi_cpu_softc { 81 device_t cpu_dev; 82 ACPI_HANDLE cpu_handle; 83 struct pcpu *cpu_pcpu; 84 uint32_t cpu_acpi_id; /* ACPI processor id */ 85 uint32_t cpu_p_blk; /* ACPI P_BLK location */ 86 uint32_t cpu_p_blk_len; /* P_BLK length (must be 6). */ 87 struct acpi_cx cpu_cx_states[MAX_CX_STATES]; 88 int cpu_cx_count; /* Number of valid Cx states. */ 89 int cpu_prev_sleep;/* Last idle sleep duration. */ 90 int cpu_features; /* Child driver supported features. */ 91 /* Runtime state. */ 92 int cpu_non_c2; /* Index of lowest non-C2 state. */ 93 int cpu_non_c3; /* Index of lowest non-C3 state. */ 94 u_int cpu_cx_stats[MAX_CX_STATES];/* Cx usage history. */ 95 /* Values for sysctl. */ 96 struct sysctl_ctx_list cpu_sysctl_ctx; 97 struct sysctl_oid *cpu_sysctl_tree; 98 int cpu_cx_lowest; 99 int cpu_cx_lowest_lim; 100 int cpu_disable_idle; /* Disable entry to idle function */ 101 char cpu_cx_supported[64]; 102}; 103 104struct acpi_cpu_device { 105 struct resource_list ad_rl; 106}; 107 108#define CPU_GET_REG(reg, width) \ 109 (bus_space_read_ ## width(rman_get_bustag((reg)), \ 110 rman_get_bushandle((reg)), 0)) 111#define CPU_SET_REG(reg, width, val) \ 112 (bus_space_write_ ## width(rman_get_bustag((reg)), \ 113 rman_get_bushandle((reg)), 0, (val))) 114 115#define ACPI_NOTIFY_CX_STATES 0x81 /* _CST changed. */ 116 117#define CPU_QUIRK_NO_C3 (1<<0) /* C3-type states are not usable. */ 118#define CPU_QUIRK_NO_BM_CTRL (1<<2) /* No bus mastering control. */ 119 120#define PCI_VENDOR_INTEL 0x8086 121#define PCI_DEVICE_82371AB_3 0x7113 /* PIIX4 chipset for quirks. */ 122#define PCI_REVISION_A_STEP 0 123#define PCI_REVISION_B_STEP 1 124#define PCI_REVISION_4E 2 125#define PCI_REVISION_4M 3 126#define PIIX4_DEVACTB_REG 0x58 127#define PIIX4_BRLD_EN_IRQ0 (1<<0) 128#define PIIX4_BRLD_EN_IRQ (1<<1) 129#define PIIX4_BRLD_EN_IRQ8 (1<<5) 130#define PIIX4_STOP_BREAK_MASK (PIIX4_BRLD_EN_IRQ0 | PIIX4_BRLD_EN_IRQ | PIIX4_BRLD_EN_IRQ8) 131#define PIIX4_PCNTRL_BST_EN (1<<10) 132 133#define CST_FFH_VENDOR_INTEL 1 134#define CST_FFH_INTEL_CL_C1IO 1 135#define CST_FFH_INTEL_CL_MWAIT 2 136#define CST_FFH_MWAIT_HW_COORD 0x0001 137#define CST_FFH_MWAIT_BM_AVOID 0x0002 138 139#define CPUDEV_DEVICE_ID "ACPI0007" 140 141/* Knob to disable acpi_cpu devices */ 142bool acpi_cpu_disabled = false; 143 144/* Platform hardware resource information. */ 145static uint32_t cpu_smi_cmd; /* Value to write to SMI_CMD. */ 146static uint8_t cpu_cst_cnt; /* Indicate we are _CST aware. */ 147static int cpu_quirks; /* Indicate any hardware bugs. */ 148 149/* Values for sysctl. */ 150static struct sysctl_ctx_list cpu_sysctl_ctx; 151static struct sysctl_oid *cpu_sysctl_tree; 152static int cpu_cx_generic; 153static int cpu_cx_lowest_lim; 154#if defined(__i386__) || defined(__amd64__) 155static bool cppc_notify; 156#endif 157 158static struct acpi_cpu_softc **cpu_softc; 159ACPI_SERIAL_DECL(cpu, "ACPI CPU"); 160 161static int acpi_cpu_probe(device_t dev); 162static int acpi_cpu_attach(device_t dev); 163static int acpi_cpu_suspend(device_t dev); 164static int acpi_cpu_resume(device_t dev); 165static int acpi_pcpu_get_id(device_t dev, uint32_t acpi_id, 166 u_int *cpu_id); 167static struct resource_list *acpi_cpu_get_rlist(device_t dev, device_t child); 168static device_t acpi_cpu_add_child(device_t dev, u_int order, const char *name, 169 int unit); 170static int acpi_cpu_read_ivar(device_t dev, device_t child, int index, 171 uintptr_t *result); 172static int acpi_cpu_shutdown(device_t dev); 173static void acpi_cpu_cx_probe(struct acpi_cpu_softc *sc); 174static void acpi_cpu_generic_cx_probe(struct acpi_cpu_softc *sc); 175static int acpi_cpu_cx_cst(struct acpi_cpu_softc *sc); 176static void acpi_cpu_startup(void *arg); 177static void acpi_cpu_startup_cx(struct acpi_cpu_softc *sc); 178static void acpi_cpu_cx_list(struct acpi_cpu_softc *sc); 179#if defined(__i386__) || defined(__amd64__) 180static void acpi_cpu_idle(sbintime_t sbt); 181#endif 182static void acpi_cpu_notify(ACPI_HANDLE h, UINT32 notify, void *context); 183static void acpi_cpu_quirks(void); 184static void acpi_cpu_quirks_piix4(void); 185static int acpi_cpu_usage_sysctl(SYSCTL_HANDLER_ARGS); 186static int acpi_cpu_usage_counters_sysctl(SYSCTL_HANDLER_ARGS); 187static int acpi_cpu_set_cx_lowest(struct acpi_cpu_softc *sc); 188static int acpi_cpu_cx_lowest_sysctl(SYSCTL_HANDLER_ARGS); 189static int acpi_cpu_global_cx_lowest_sysctl(SYSCTL_HANDLER_ARGS); 190#if defined(__i386__) || defined(__amd64__) 191static int acpi_cpu_method_sysctl(SYSCTL_HANDLER_ARGS); 192#endif 193 194static device_method_t acpi_cpu_methods[] = { 195 /* Device interface */ 196 DEVMETHOD(device_probe, acpi_cpu_probe), 197 DEVMETHOD(device_attach, acpi_cpu_attach), 198 DEVMETHOD(device_detach, bus_generic_detach), 199 DEVMETHOD(device_shutdown, acpi_cpu_shutdown), 200 DEVMETHOD(device_suspend, acpi_cpu_suspend), 201 DEVMETHOD(device_resume, acpi_cpu_resume), 202 203 /* Bus interface */ 204 DEVMETHOD(bus_add_child, acpi_cpu_add_child), 205 DEVMETHOD(bus_read_ivar, acpi_cpu_read_ivar), 206 DEVMETHOD(bus_get_resource_list, acpi_cpu_get_rlist), 207 DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource), 208 DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource), 209 DEVMETHOD(bus_alloc_resource, bus_generic_rl_alloc_resource), 210 DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource), 211 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 212 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 213 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 214 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 215 216 DEVMETHOD_END 217}; 218 219static driver_t acpi_cpu_driver = { 220 "cpu", 221 acpi_cpu_methods, 222 sizeof(struct acpi_cpu_softc), 223}; 224 225DRIVER_MODULE(cpu, acpi, acpi_cpu_driver, 0, 0); 226MODULE_DEPEND(cpu, acpi, 1, 1, 1); 227 228static int 229acpi_cpu_probe(device_t dev) 230{ 231 static char *cpudev_ids[] = { CPUDEV_DEVICE_ID, NULL }; 232 int acpi_id, cpu_id; 233 ACPI_BUFFER buf; 234 ACPI_HANDLE handle; 235 ACPI_OBJECT *obj; 236 ACPI_STATUS status; 237 ACPI_OBJECT_TYPE type; 238 239 if (acpi_disabled("cpu") || acpi_cpu_disabled) 240 return (ENXIO); 241 type = acpi_get_type(dev); 242 if (type != ACPI_TYPE_PROCESSOR && type != ACPI_TYPE_DEVICE) 243 return (ENXIO); 244 if (type == ACPI_TYPE_DEVICE && 245 ACPI_ID_PROBE(device_get_parent(dev), dev, cpudev_ids, NULL) >= 0) 246 return (ENXIO); 247 248 handle = acpi_get_handle(dev); 249 if (cpu_softc == NULL) 250 cpu_softc = malloc(sizeof(struct acpi_cpu_softc *) * 251 (mp_maxid + 1), M_TEMP /* XXX */, M_WAITOK | M_ZERO); 252 253 if (type == ACPI_TYPE_PROCESSOR) { 254 /* Get our Processor object. */ 255 buf.Pointer = NULL; 256 buf.Length = ACPI_ALLOCATE_BUFFER; 257 status = AcpiEvaluateObject(handle, NULL, NULL, &buf); 258 if (ACPI_FAILURE(status)) { 259 device_printf(dev, "probe failed to get Processor obj - %s\n", 260 AcpiFormatException(status)); 261 return (ENXIO); 262 } 263 obj = (ACPI_OBJECT *)buf.Pointer; 264 if (obj->Type != ACPI_TYPE_PROCESSOR) { 265 device_printf(dev, "Processor object has bad type %d\n", 266 obj->Type); 267 AcpiOsFree(obj); 268 return (ENXIO); 269 } 270 271 /* 272 * Find the processor associated with our unit. We could use the 273 * ProcId as a key, however, some boxes do not have the same values 274 * in their Processor object as the ProcId values in the MADT. 275 */ 276 acpi_id = obj->Processor.ProcId; 277 AcpiOsFree(obj); 278 } else { 279 status = acpi_GetInteger(handle, "_UID", &acpi_id); 280 if (ACPI_FAILURE(status)) { 281 device_printf(dev, "Device object has bad value - %s\n", 282 AcpiFormatException(status)); 283 return (ENXIO); 284 } 285 } 286 if (acpi_pcpu_get_id(dev, acpi_id, &cpu_id) != 0) { 287 if (bootverbose && (type != ACPI_TYPE_PROCESSOR || acpi_id != 255)) 288 printf("ACPI: Processor %s (ACPI ID %u) ignored\n", 289 acpi_name(acpi_get_handle(dev)), acpi_id); 290 return (ENXIO); 291 } 292 293 if (device_set_unit(dev, cpu_id) != 0) 294 return (ENXIO); 295 296 device_set_desc(dev, "ACPI CPU"); 297 298 if (!bootverbose && device_get_unit(dev) != 0) { 299 device_quiet(dev); 300 device_quiet_children(dev); 301 } 302 303 return (BUS_PROBE_DEFAULT); 304} 305 306static int 307acpi_cpu_attach(device_t dev) 308{ 309 ACPI_BUFFER buf; 310 ACPI_OBJECT arg, *obj; 311 ACPI_OBJECT_LIST arglist; 312 struct pcpu *pcpu_data; 313 struct acpi_cpu_softc *sc; 314 struct acpi_softc *acpi_sc; 315 ACPI_STATUS status; 316 u_int features; 317 int cpu_id, drv_count, i; 318 driver_t **drivers; 319 uint32_t cap_set[3]; 320 321 /* UUID needed by _OSC evaluation */ 322 static uint8_t cpu_oscuuid[16] = { 0x16, 0xA6, 0x77, 0x40, 0x0C, 0x29, 323 0xBE, 0x47, 0x9E, 0xBD, 0xD8, 0x70, 324 0x58, 0x71, 0x39, 0x53 }; 325 326 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 327 328 sc = device_get_softc(dev); 329 sc->cpu_dev = dev; 330 sc->cpu_handle = acpi_get_handle(dev); 331 cpu_id = device_get_unit(dev); 332 cpu_softc[cpu_id] = sc; 333 pcpu_data = pcpu_find(cpu_id); 334 pcpu_data->pc_device = dev; 335 sc->cpu_pcpu = pcpu_data; 336 cpu_smi_cmd = AcpiGbl_FADT.SmiCommand; 337 cpu_cst_cnt = AcpiGbl_FADT.CstControl; 338 339 if (acpi_get_type(dev) == ACPI_TYPE_PROCESSOR) { 340 buf.Pointer = NULL; 341 buf.Length = ACPI_ALLOCATE_BUFFER; 342 status = AcpiEvaluateObject(sc->cpu_handle, NULL, NULL, &buf); 343 if (ACPI_FAILURE(status)) { 344 device_printf(dev, "attach failed to get Processor obj - %s\n", 345 AcpiFormatException(status)); 346 return (ENXIO); 347 } 348 obj = (ACPI_OBJECT *)buf.Pointer; 349 sc->cpu_p_blk = obj->Processor.PblkAddress; 350 sc->cpu_p_blk_len = obj->Processor.PblkLength; 351 sc->cpu_acpi_id = obj->Processor.ProcId; 352 AcpiOsFree(obj); 353 } else { 354 KASSERT(acpi_get_type(dev) == ACPI_TYPE_DEVICE, 355 ("Unexpected ACPI object")); 356 status = acpi_GetInteger(sc->cpu_handle, "_UID", &sc->cpu_acpi_id); 357 if (ACPI_FAILURE(status)) { 358 device_printf(dev, "Device object has bad value - %s\n", 359 AcpiFormatException(status)); 360 return (ENXIO); 361 } 362 sc->cpu_p_blk = 0; 363 sc->cpu_p_blk_len = 0; 364 } 365 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "acpi_cpu%d: P_BLK at %#x/%d\n", 366 device_get_unit(dev), sc->cpu_p_blk, sc->cpu_p_blk_len)); 367 368 /* 369 * If this is the first cpu we attach, create and initialize the generic 370 * resources that will be used by all acpi cpu devices. 371 */ 372 if (device_get_unit(dev) == 0) { 373 /* Assume we won't be using generic Cx mode by default */ 374 cpu_cx_generic = FALSE; 375 376 /* Install hw.acpi.cpu sysctl tree */ 377 acpi_sc = acpi_device_get_parent_softc(dev); 378 sysctl_ctx_init(&cpu_sysctl_ctx); 379 cpu_sysctl_tree = SYSCTL_ADD_NODE(&cpu_sysctl_ctx, 380 SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree), OID_AUTO, "cpu", 381 CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "node for CPU children"); 382 383#if defined(__i386__) || defined(__amd64__) 384 /* Add sysctl handler to control registering for CPPC notifications */ 385 cppc_notify = 1; 386 SYSCTL_ADD_BOOL(&cpu_sysctl_ctx, SYSCTL_CHILDREN(cpu_sysctl_tree), 387 OID_AUTO, "cppc_notify", CTLFLAG_RDTUN | CTLFLAG_MPSAFE, 388 &cppc_notify, 0, "Register for CPPC Notifications"); 389#endif 390 } 391 392 /* 393 * Before calling any CPU methods, collect child driver feature hints 394 * and notify ACPI of them. We support unified SMP power control 395 * so advertise this ourselves. Note this is not the same as independent 396 * SMP control where each CPU can have different settings. 397 */ 398 sc->cpu_features = ACPI_CAP_SMP_SAME | ACPI_CAP_SMP_SAME_C3 | 399 ACPI_CAP_C1_IO_HALT; 400 401#if defined(__i386__) || defined(__amd64__) 402 /* 403 * Ask for MWAIT modes if not disabled and interrupts work 404 * reasonable with MWAIT. 405 */ 406 if (!acpi_disabled("mwait") && cpu_mwait_usable()) 407 sc->cpu_features |= ACPI_CAP_SMP_C1_NATIVE | ACPI_CAP_SMP_C3_NATIVE; 408 409 /* 410 * Work around a lingering SMM bug which leads to freezes when handling 411 * CPPC notifications. Tell the SMM we will handle any CPPC notifications. 412 */ 413 if ((cpu_power_eax & CPUTPM1_HWP_NOTIFICATION) && cppc_notify) 414 sc->cpu_features |= ACPI_CAP_INTR_CPPC; 415#endif 416 417 if (devclass_get_drivers(device_get_devclass(dev), &drivers, 418 &drv_count) == 0) { 419 for (i = 0; i < drv_count; i++) { 420 if (ACPI_GET_FEATURES(drivers[i], &features) == 0) 421 sc->cpu_features |= features; 422 } 423 free(drivers, M_TEMP); 424 } 425 426 /* 427 * CPU capabilities are specified in 428 * Intel Processor Vendor-Specific ACPI Interface Specification. 429 */ 430 if (sc->cpu_features) { 431 cap_set[1] = sc->cpu_features; 432 status = acpi_EvaluateOSC(sc->cpu_handle, cpu_oscuuid, 1, 2, cap_set, 433 cap_set, false); 434 if (ACPI_SUCCESS(status)) { 435 if (cap_set[0] != 0) 436 device_printf(dev, "_OSC returned status %#x\n", cap_set[0]); 437 } 438 else { 439 arglist.Pointer = &arg; 440 arglist.Count = 1; 441 arg.Type = ACPI_TYPE_BUFFER; 442 arg.Buffer.Length = sizeof(cap_set); 443 arg.Buffer.Pointer = (uint8_t *)cap_set; 444 cap_set[0] = 1; /* revision */ 445 cap_set[1] = 1; /* number of capabilities integers */ 446 cap_set[2] = sc->cpu_features; 447 AcpiEvaluateObject(sc->cpu_handle, "_PDC", &arglist, NULL); 448 } 449 } 450 451 /* Probe for Cx state support. */ 452 acpi_cpu_cx_probe(sc); 453 454 return (0); 455} 456 457static void 458acpi_cpu_postattach(void *unused __unused) 459{ 460 struct acpi_cpu_softc *sc; 461 int attached = 0, i; 462 463 if (cpu_softc == NULL) 464 return; 465 466 bus_topo_lock(); 467 CPU_FOREACH(i) { 468 if ((sc = cpu_softc[i]) != NULL) 469 bus_generic_probe(sc->cpu_dev); 470 } 471 CPU_FOREACH(i) { 472 if ((sc = cpu_softc[i]) != NULL) { 473 bus_generic_attach(sc->cpu_dev); 474 attached = 1; 475 } 476 } 477 bus_topo_unlock(); 478 479 if (attached) { 480#ifdef EARLY_AP_STARTUP 481 acpi_cpu_startup(NULL); 482#else 483 /* Queue post cpu-probing task handler */ 484 AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_cpu_startup, NULL); 485#endif 486 } 487} 488 489SYSINIT(acpi_cpu, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, 490 acpi_cpu_postattach, NULL); 491 492static void 493disable_idle(struct acpi_cpu_softc *sc) 494{ 495 cpuset_t cpuset; 496 497 CPU_SETOF(sc->cpu_pcpu->pc_cpuid, &cpuset); 498 sc->cpu_disable_idle = TRUE; 499 500 /* 501 * Ensure that the CPU is not in idle state or in acpi_cpu_idle(). 502 * Note that this code depends on the fact that the rendezvous IPI 503 * can not penetrate context where interrupts are disabled and acpi_cpu_idle 504 * is called and executed in such a context with interrupts being re-enabled 505 * right before return. 506 */ 507 smp_rendezvous_cpus(cpuset, smp_no_rendezvous_barrier, NULL, 508 smp_no_rendezvous_barrier, NULL); 509} 510 511static void 512enable_idle(struct acpi_cpu_softc *sc) 513{ 514 515 if (sc->cpu_cx_count > sc->cpu_non_c3 + 1 && 516 (cpu_quirks & CPU_QUIRK_NO_BM_CTRL) == 0) 517 AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_RLD, 1); 518 sc->cpu_disable_idle = FALSE; 519} 520 521#if defined(__i386__) || defined(__amd64__) 522static int 523is_idle_disabled(struct acpi_cpu_softc *sc) 524{ 525 526 return (sc->cpu_disable_idle); 527} 528#endif 529 530/* 531 * Disable any entry to the idle function during suspend and re-enable it 532 * during resume. 533 */ 534static int 535acpi_cpu_suspend(device_t dev) 536{ 537 int error; 538 539 error = bus_generic_suspend(dev); 540 if (error) 541 return (error); 542 disable_idle(device_get_softc(dev)); 543 return (0); 544} 545 546static int 547acpi_cpu_resume(device_t dev) 548{ 549 550 enable_idle(device_get_softc(dev)); 551 return (bus_generic_resume(dev)); 552} 553 554/* 555 * Find the processor associated with a given ACPI ID. 556 */ 557static int 558acpi_pcpu_get_id(device_t dev, uint32_t acpi_id, u_int *cpu_id) 559{ 560 struct pcpu *pc; 561 u_int i; 562 563 CPU_FOREACH(i) { 564 pc = pcpu_find(i); 565 if (pc->pc_acpi_id == acpi_id) { 566 *cpu_id = pc->pc_cpuid; 567 return (0); 568 } 569 } 570 571 /* 572 * If pc_acpi_id for CPU 0 is not initialized (e.g. a non-APIC 573 * UP box) use the ACPI ID from the first processor we find. 574 */ 575 if (mp_ncpus == 1) { 576 pc = pcpu_find(0); 577 if (pc->pc_acpi_id == 0xffffffff) 578 pc->pc_acpi_id = acpi_id; 579 *cpu_id = 0; 580 return (0); 581 } 582 583 return (ESRCH); 584} 585 586static struct resource_list * 587acpi_cpu_get_rlist(device_t dev, device_t child) 588{ 589 struct acpi_cpu_device *ad; 590 591 ad = device_get_ivars(child); 592 if (ad == NULL) 593 return (NULL); 594 return (&ad->ad_rl); 595} 596 597static device_t 598acpi_cpu_add_child(device_t dev, u_int order, const char *name, int unit) 599{ 600 struct acpi_cpu_device *ad; 601 device_t child; 602 603 if ((ad = malloc(sizeof(*ad), M_TEMP, M_NOWAIT | M_ZERO)) == NULL) 604 return (NULL); 605 606 resource_list_init(&ad->ad_rl); 607 608 child = device_add_child_ordered(dev, order, name, unit); 609 if (child != NULL) 610 device_set_ivars(child, ad); 611 else 612 free(ad, M_TEMP); 613 return (child); 614} 615 616static int 617acpi_cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result) 618{ 619 struct acpi_cpu_softc *sc; 620 621 sc = device_get_softc(dev); 622 switch (index) { 623 case ACPI_IVAR_HANDLE: 624 *result = (uintptr_t)sc->cpu_handle; 625 break; 626 case CPU_IVAR_PCPU: 627 *result = (uintptr_t)sc->cpu_pcpu; 628 break; 629#if defined(__amd64__) || defined(__i386__) 630 case CPU_IVAR_NOMINAL_MHZ: 631 if (tsc_is_invariant) { 632 *result = (uintptr_t)(atomic_load_acq_64(&tsc_freq) / 1000000); 633 break; 634 } 635 /* FALLTHROUGH */ 636#endif 637 default: 638 return (ENOENT); 639 } 640 return (0); 641} 642 643static int 644acpi_cpu_shutdown(device_t dev) 645{ 646 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 647 648 /* Allow children to shutdown first. */ 649 bus_generic_shutdown(dev); 650 651 /* 652 * Disable any entry to the idle function. 653 */ 654 disable_idle(device_get_softc(dev)); 655 656 /* 657 * CPU devices are not truly detached and remain referenced, 658 * so their resources are not freed. 659 */ 660 661 return_VALUE (0); 662} 663 664static void 665acpi_cpu_cx_probe(struct acpi_cpu_softc *sc) 666{ 667 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 668 669 /* Use initial sleep value of 1 sec. to start with lowest idle state. */ 670 sc->cpu_prev_sleep = 1000000; 671 sc->cpu_cx_lowest = 0; 672 sc->cpu_cx_lowest_lim = 0; 673 674 /* 675 * Check for the ACPI 2.0 _CST sleep states object. If we can't find 676 * any, we'll revert to generic FADT/P_BLK Cx control method which will 677 * be handled by acpi_cpu_startup. We need to defer to after having 678 * probed all the cpus in the system before probing for generic Cx 679 * states as we may already have found cpus with valid _CST packages 680 */ 681 if (!cpu_cx_generic && acpi_cpu_cx_cst(sc) != 0) { 682 /* 683 * We were unable to find a _CST package for this cpu or there 684 * was an error parsing it. Switch back to generic mode. 685 */ 686 cpu_cx_generic = TRUE; 687 if (bootverbose) 688 device_printf(sc->cpu_dev, "switching to generic Cx mode\n"); 689 } 690 691 /* 692 * TODO: _CSD Package should be checked here. 693 */ 694} 695 696static void 697acpi_cpu_generic_cx_probe(struct acpi_cpu_softc *sc) 698{ 699 ACPI_GENERIC_ADDRESS gas; 700 struct acpi_cx *cx_ptr; 701 702 sc->cpu_cx_count = 0; 703 cx_ptr = sc->cpu_cx_states; 704 705 /* Use initial sleep value of 1 sec. to start with lowest idle state. */ 706 sc->cpu_prev_sleep = 1000000; 707 708 /* C1 has been required since just after ACPI 1.0 */ 709 cx_ptr->type = ACPI_STATE_C1; 710 cx_ptr->trans_lat = 0; 711 cx_ptr++; 712 sc->cpu_non_c2 = sc->cpu_cx_count; 713 sc->cpu_non_c3 = sc->cpu_cx_count; 714 sc->cpu_cx_count++; 715 716 /* 717 * The spec says P_BLK must be 6 bytes long. However, some systems 718 * use it to indicate a fractional set of features present so we 719 * take 5 as C2. Some may also have a value of 7 to indicate 720 * another C3 but most use _CST for this (as required) and having 721 * "only" C1-C3 is not a hardship. 722 */ 723 if (sc->cpu_p_blk_len < 5) 724 return; 725 726 /* Validate and allocate resources for C2 (P_LVL2). */ 727 gas.SpaceId = ACPI_ADR_SPACE_SYSTEM_IO; 728 gas.BitWidth = 8; 729 if (AcpiGbl_FADT.C2Latency <= 100) { 730 gas.Address = sc->cpu_p_blk + 4; 731 cx_ptr->res_rid = 0; 732 acpi_bus_alloc_gas(sc->cpu_dev, &cx_ptr->res_type, &cx_ptr->res_rid, 733 &gas, &cx_ptr->p_lvlx, RF_SHAREABLE); 734 if (cx_ptr->p_lvlx != NULL) { 735 cx_ptr->type = ACPI_STATE_C2; 736 cx_ptr->trans_lat = AcpiGbl_FADT.C2Latency; 737 cx_ptr++; 738 sc->cpu_non_c3 = sc->cpu_cx_count; 739 sc->cpu_cx_count++; 740 } 741 } 742 if (sc->cpu_p_blk_len < 6) 743 return; 744 745 /* Validate and allocate resources for C3 (P_LVL3). */ 746 if (AcpiGbl_FADT.C3Latency <= 1000 && !(cpu_quirks & CPU_QUIRK_NO_C3)) { 747 gas.Address = sc->cpu_p_blk + 5; 748 cx_ptr->res_rid = 1; 749 acpi_bus_alloc_gas(sc->cpu_dev, &cx_ptr->res_type, &cx_ptr->res_rid, 750 &gas, &cx_ptr->p_lvlx, RF_SHAREABLE); 751 if (cx_ptr->p_lvlx != NULL) { 752 cx_ptr->type = ACPI_STATE_C3; 753 cx_ptr->trans_lat = AcpiGbl_FADT.C3Latency; 754 cx_ptr++; 755 sc->cpu_cx_count++; 756 } 757 } 758} 759 760#if defined(__i386__) || defined(__amd64__) 761static void 762acpi_cpu_cx_cst_mwait(struct acpi_cx *cx_ptr, uint64_t address, int accsize) 763{ 764 765 cx_ptr->do_mwait = true; 766 cx_ptr->mwait_hint = address & 0xffffffff; 767 cx_ptr->mwait_hw_coord = (accsize & CST_FFH_MWAIT_HW_COORD) != 0; 768 cx_ptr->mwait_bm_avoidance = (accsize & CST_FFH_MWAIT_BM_AVOID) != 0; 769} 770#endif 771 772static void 773acpi_cpu_cx_cst_free_plvlx(device_t cpu_dev, struct acpi_cx *cx_ptr) 774{ 775 776 if (cx_ptr->p_lvlx == NULL) 777 return; 778 bus_release_resource(cpu_dev, cx_ptr->res_type, cx_ptr->res_rid, 779 cx_ptr->p_lvlx); 780 cx_ptr->p_lvlx = NULL; 781} 782 783/* 784 * Parse a _CST package and set up its Cx states. Since the _CST object 785 * can change dynamically, our notify handler may call this function 786 * to clean up and probe the new _CST package. 787 */ 788static int 789acpi_cpu_cx_cst(struct acpi_cpu_softc *sc) 790{ 791 struct acpi_cx *cx_ptr; 792 ACPI_STATUS status; 793 ACPI_BUFFER buf; 794 ACPI_OBJECT *top; 795 ACPI_OBJECT *pkg; 796 uint32_t count; 797 int i; 798#if defined(__i386__) || defined(__amd64__) 799 uint64_t address; 800 int vendor, class, accsize; 801#endif 802 803 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 804 805 buf.Pointer = NULL; 806 buf.Length = ACPI_ALLOCATE_BUFFER; 807 status = AcpiEvaluateObject(sc->cpu_handle, "_CST", NULL, &buf); 808 if (ACPI_FAILURE(status)) 809 return (ENXIO); 810 811 /* _CST is a package with a count and at least one Cx package. */ 812 top = (ACPI_OBJECT *)buf.Pointer; 813 if (!ACPI_PKG_VALID(top, 2) || acpi_PkgInt32(top, 0, &count) != 0) { 814 device_printf(sc->cpu_dev, "invalid _CST package\n"); 815 AcpiOsFree(buf.Pointer); 816 return (ENXIO); 817 } 818 if (count != top->Package.Count - 1) { 819 device_printf(sc->cpu_dev, "invalid _CST state count (%d != %d)\n", 820 count, top->Package.Count - 1); 821 count = top->Package.Count - 1; 822 } 823 if (count > MAX_CX_STATES) { 824 device_printf(sc->cpu_dev, "_CST has too many states (%d)\n", count); 825 count = MAX_CX_STATES; 826 } 827 828 sc->cpu_non_c2 = 0; 829 sc->cpu_non_c3 = 0; 830 sc->cpu_cx_count = 0; 831 cx_ptr = sc->cpu_cx_states; 832 833 /* 834 * C1 has been required since just after ACPI 1.0. 835 * Reserve the first slot for it. 836 */ 837 cx_ptr->type = ACPI_STATE_C0; 838 cx_ptr++; 839 sc->cpu_cx_count++; 840 841 /* Set up all valid states. */ 842 for (i = 0; i < count; i++) { 843 pkg = &top->Package.Elements[i + 1]; 844 if (!ACPI_PKG_VALID(pkg, 4) || 845 acpi_PkgInt32(pkg, 1, &cx_ptr->type) != 0 || 846 acpi_PkgInt32(pkg, 2, &cx_ptr->trans_lat) != 0 || 847 acpi_PkgInt32(pkg, 3, &cx_ptr->power) != 0) { 848 device_printf(sc->cpu_dev, "skipping invalid Cx state package\n"); 849 continue; 850 } 851 852 /* Validate the state to see if we should use it. */ 853 switch (cx_ptr->type) { 854 case ACPI_STATE_C1: 855 acpi_cpu_cx_cst_free_plvlx(sc->cpu_dev, cx_ptr); 856#if defined(__i386__) || defined(__amd64__) 857 if (acpi_PkgFFH_IntelCpu(pkg, 0, &vendor, &class, &address, 858 &accsize) == 0 && vendor == CST_FFH_VENDOR_INTEL) { 859 if (class == CST_FFH_INTEL_CL_C1IO) { 860 /* C1 I/O then Halt */ 861 cx_ptr->res_rid = sc->cpu_cx_count; 862 bus_set_resource(sc->cpu_dev, SYS_RES_IOPORT, 863 cx_ptr->res_rid, address, 1); 864 cx_ptr->p_lvlx = bus_alloc_resource_any(sc->cpu_dev, 865 SYS_RES_IOPORT, &cx_ptr->res_rid, RF_ACTIVE | 866 RF_SHAREABLE); 867 if (cx_ptr->p_lvlx == NULL) { 868 bus_delete_resource(sc->cpu_dev, SYS_RES_IOPORT, 869 cx_ptr->res_rid); 870 device_printf(sc->cpu_dev, 871 "C1 I/O failed to allocate port %d, " 872 "degrading to C1 Halt", (int)address); 873 } 874 } else if (class == CST_FFH_INTEL_CL_MWAIT) { 875 acpi_cpu_cx_cst_mwait(cx_ptr, address, accsize); 876 } 877 } 878#endif 879 if (sc->cpu_cx_states[0].type == ACPI_STATE_C0) { 880 /* This is the first C1 state. Use the reserved slot. */ 881 sc->cpu_cx_states[0] = *cx_ptr; 882 } else { 883 sc->cpu_non_c2 = sc->cpu_cx_count; 884 sc->cpu_non_c3 = sc->cpu_cx_count; 885 cx_ptr++; 886 sc->cpu_cx_count++; 887 } 888 continue; 889 case ACPI_STATE_C2: 890 sc->cpu_non_c3 = sc->cpu_cx_count; 891 break; 892 case ACPI_STATE_C3: 893 default: 894 if ((cpu_quirks & CPU_QUIRK_NO_C3) != 0) { 895 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 896 "acpi_cpu%d: C3[%d] not available.\n", 897 device_get_unit(sc->cpu_dev), i)); 898 continue; 899 } 900 break; 901 } 902 903 /* Free up any previous register. */ 904 acpi_cpu_cx_cst_free_plvlx(sc->cpu_dev, cx_ptr); 905 906 /* Allocate the control register for C2 or C3. */ 907#if defined(__i386__) || defined(__amd64__) 908 if (acpi_PkgFFH_IntelCpu(pkg, 0, &vendor, &class, &address, 909 &accsize) == 0 && vendor == CST_FFH_VENDOR_INTEL && 910 class == CST_FFH_INTEL_CL_MWAIT) { 911 /* Native C State Instruction use (mwait) */ 912 acpi_cpu_cx_cst_mwait(cx_ptr, address, accsize); 913 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 914 "acpi_cpu%d: Got C%d/mwait - %d latency\n", 915 device_get_unit(sc->cpu_dev), cx_ptr->type, cx_ptr->trans_lat)); 916 cx_ptr++; 917 sc->cpu_cx_count++; 918 } else 919#endif 920 { 921 cx_ptr->res_rid = sc->cpu_cx_count; 922 acpi_PkgGas(sc->cpu_dev, pkg, 0, &cx_ptr->res_type, 923 &cx_ptr->res_rid, &cx_ptr->p_lvlx, RF_SHAREABLE); 924 if (cx_ptr->p_lvlx) { 925 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 926 "acpi_cpu%d: Got C%d - %d latency\n", 927 device_get_unit(sc->cpu_dev), cx_ptr->type, 928 cx_ptr->trans_lat)); 929 cx_ptr++; 930 sc->cpu_cx_count++; 931 } 932 } 933 } 934 AcpiOsFree(buf.Pointer); 935 936 /* If C1 state was not found, we need one now. */ 937 cx_ptr = sc->cpu_cx_states; 938 if (cx_ptr->type == ACPI_STATE_C0) { 939 cx_ptr->type = ACPI_STATE_C1; 940 cx_ptr->trans_lat = 0; 941 } 942 943 return (0); 944} 945 946/* 947 * Call this *after* all CPUs have been attached. 948 */ 949static void 950acpi_cpu_startup(void *arg) 951{ 952 struct acpi_cpu_softc *sc; 953 int i; 954 955 /* 956 * Setup any quirks that might necessary now that we have probed 957 * all the CPUs 958 */ 959 acpi_cpu_quirks(); 960 961 if (cpu_cx_generic) { 962 /* 963 * We are using generic Cx mode, probe for available Cx states 964 * for all processors. 965 */ 966 CPU_FOREACH(i) { 967 if ((sc = cpu_softc[i]) != NULL) 968 acpi_cpu_generic_cx_probe(sc); 969 } 970 } else { 971 /* 972 * We are using _CST mode, remove C3 state if necessary. 973 * As we now know for sure that we will be using _CST mode 974 * install our notify handler. 975 */ 976 CPU_FOREACH(i) { 977 if ((sc = cpu_softc[i]) == NULL) 978 continue; 979 if (cpu_quirks & CPU_QUIRK_NO_C3) { 980 sc->cpu_cx_count = min(sc->cpu_cx_count, sc->cpu_non_c3 + 1); 981 } 982 AcpiInstallNotifyHandler(sc->cpu_handle, ACPI_DEVICE_NOTIFY, 983 acpi_cpu_notify, sc); 984 } 985 } 986 987 /* Perform Cx final initialization. */ 988 CPU_FOREACH(i) { 989 if ((sc = cpu_softc[i]) != NULL) 990 acpi_cpu_startup_cx(sc); 991 } 992 993 /* Add a sysctl handler to handle global Cx lowest setting */ 994 SYSCTL_ADD_PROC(&cpu_sysctl_ctx, SYSCTL_CHILDREN(cpu_sysctl_tree), 995 OID_AUTO, "cx_lowest", CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_MPSAFE, 996 NULL, 0, acpi_cpu_global_cx_lowest_sysctl, "A", 997 "Global lowest Cx sleep state to use"); 998 999 /* Take over idling from cpu_idle_default(). */ 1000 cpu_cx_lowest_lim = 0; 1001 CPU_FOREACH(i) { 1002 if ((sc = cpu_softc[i]) != NULL) 1003 enable_idle(sc); 1004 } 1005#if defined(__i386__) || defined(__amd64__) 1006 cpu_idle_hook = acpi_cpu_idle; 1007#endif 1008} 1009 1010static void 1011acpi_cpu_cx_list(struct acpi_cpu_softc *sc) 1012{ 1013 struct sbuf sb; 1014 int i; 1015 1016 /* 1017 * Set up the list of Cx states 1018 */ 1019 sbuf_new(&sb, sc->cpu_cx_supported, sizeof(sc->cpu_cx_supported), 1020 SBUF_FIXEDLEN); 1021 for (i = 0; i < sc->cpu_cx_count; i++) 1022 sbuf_printf(&sb, "C%d/%d/%d ", i + 1, sc->cpu_cx_states[i].type, 1023 sc->cpu_cx_states[i].trans_lat); 1024 sbuf_trim(&sb); 1025 sbuf_finish(&sb); 1026} 1027 1028static void 1029acpi_cpu_startup_cx(struct acpi_cpu_softc *sc) 1030{ 1031 acpi_cpu_cx_list(sc); 1032 1033 SYSCTL_ADD_STRING(&sc->cpu_sysctl_ctx, 1034 SYSCTL_CHILDREN(device_get_sysctl_tree(sc->cpu_dev)), 1035 OID_AUTO, "cx_supported", CTLFLAG_RD, 1036 sc->cpu_cx_supported, 0, 1037 "Cx/microsecond values for supported Cx states"); 1038 SYSCTL_ADD_PROC(&sc->cpu_sysctl_ctx, 1039 SYSCTL_CHILDREN(device_get_sysctl_tree(sc->cpu_dev)), OID_AUTO, 1040 "cx_lowest", CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_MPSAFE, 1041 (void *)sc, 0, acpi_cpu_cx_lowest_sysctl, "A", 1042 "lowest Cx sleep state to use"); 1043 SYSCTL_ADD_PROC(&sc->cpu_sysctl_ctx, 1044 SYSCTL_CHILDREN(device_get_sysctl_tree(sc->cpu_dev)), OID_AUTO, 1045 "cx_usage", CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, 1046 (void *)sc, 0, acpi_cpu_usage_sysctl, "A", 1047 "percent usage for each Cx state"); 1048 SYSCTL_ADD_PROC(&sc->cpu_sysctl_ctx, 1049 SYSCTL_CHILDREN(device_get_sysctl_tree(sc->cpu_dev)), OID_AUTO, 1050 "cx_usage_counters", CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, 1051 (void *)sc, 0, acpi_cpu_usage_counters_sysctl, "A", 1052 "Cx sleep state counters"); 1053#if defined(__i386__) || defined(__amd64__) 1054 SYSCTL_ADD_PROC(&sc->cpu_sysctl_ctx, 1055 SYSCTL_CHILDREN(device_get_sysctl_tree(sc->cpu_dev)), OID_AUTO, 1056 "cx_method", CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, 1057 (void *)sc, 0, acpi_cpu_method_sysctl, "A", "Cx entrance methods"); 1058#endif 1059 1060 /* Signal platform that we can handle _CST notification. */ 1061 if (!cpu_cx_generic && cpu_cst_cnt != 0) { 1062 ACPI_LOCK(acpi); 1063 AcpiOsWritePort(cpu_smi_cmd, cpu_cst_cnt, 8); 1064 ACPI_UNLOCK(acpi); 1065 } 1066} 1067 1068#if defined(__i386__) || defined(__amd64__) 1069/* 1070 * Idle the CPU in the lowest state possible. This function is called with 1071 * interrupts disabled. Note that once it re-enables interrupts, a task 1072 * switch can occur so do not access shared data (i.e. the softc) after 1073 * interrupts are re-enabled. 1074 */ 1075static void 1076acpi_cpu_idle(sbintime_t sbt) 1077{ 1078 struct acpi_cpu_softc *sc; 1079 struct acpi_cx *cx_next; 1080 uint64_t start_ticks, end_ticks; 1081 uint32_t start_time, end_time; 1082 ACPI_STATUS status; 1083 int bm_active, cx_next_idx, i, us; 1084 1085 /* 1086 * Look up our CPU id to get our softc. If it's NULL, we'll use C1 1087 * since there is no ACPI processor object for this CPU. This occurs 1088 * for logical CPUs in the HTT case. 1089 */ 1090 sc = cpu_softc[PCPU_GET(cpuid)]; 1091 if (sc == NULL) { 1092 acpi_cpu_c1(); 1093 return; 1094 } 1095 1096 /* If disabled, take the safe path. */ 1097 if (is_idle_disabled(sc)) { 1098 acpi_cpu_c1(); 1099 return; 1100 } 1101 1102 /* Find the lowest state that has small enough latency. */ 1103 us = sc->cpu_prev_sleep; 1104 if (sbt >= 0 && us > (sbt >> 12)) 1105 us = (sbt >> 12); 1106 cx_next_idx = 0; 1107 if (cpu_disable_c2_sleep) 1108 i = min(sc->cpu_cx_lowest, sc->cpu_non_c2); 1109 else if (cpu_disable_c3_sleep) 1110 i = min(sc->cpu_cx_lowest, sc->cpu_non_c3); 1111 else 1112 i = sc->cpu_cx_lowest; 1113 for (; i >= 0; i--) { 1114 if (sc->cpu_cx_states[i].trans_lat * 3 <= us) { 1115 cx_next_idx = i; 1116 break; 1117 } 1118 } 1119 1120 /* 1121 * Check for bus master activity. If there was activity, clear 1122 * the bit and use the lowest non-C3 state. Note that the USB 1123 * driver polling for new devices keeps this bit set all the 1124 * time if USB is loaded. 1125 */ 1126 cx_next = &sc->cpu_cx_states[cx_next_idx]; 1127 if ((cpu_quirks & CPU_QUIRK_NO_BM_CTRL) == 0 && 1128 cx_next_idx > sc->cpu_non_c3 && 1129 (!cx_next->do_mwait || cx_next->mwait_bm_avoidance)) { 1130 status = AcpiReadBitRegister(ACPI_BITREG_BUS_MASTER_STATUS, &bm_active); 1131 if (ACPI_SUCCESS(status) && bm_active != 0) { 1132 AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_STATUS, 1); 1133 cx_next_idx = sc->cpu_non_c3; 1134 cx_next = &sc->cpu_cx_states[cx_next_idx]; 1135 } 1136 } 1137 1138 /* Select the next state and update statistics. */ 1139 sc->cpu_cx_stats[cx_next_idx]++; 1140 KASSERT(cx_next->type != ACPI_STATE_C0, ("acpi_cpu_idle: C0 sleep")); 1141 1142 /* 1143 * Execute HLT (or equivalent) and wait for an interrupt. We can't 1144 * precisely calculate the time spent in C1 since the place we wake up 1145 * is an ISR. Assume we slept no more then half of quantum, unless 1146 * we are called inside critical section, delaying context switch. 1147 */ 1148 if (cx_next->type == ACPI_STATE_C1) { 1149 start_ticks = cpu_ticks(); 1150 if (cx_next->p_lvlx != NULL) { 1151 /* C1 I/O then Halt */ 1152 CPU_GET_REG(cx_next->p_lvlx, 1); 1153 } 1154 if (cx_next->do_mwait) 1155 acpi_cpu_idle_mwait(cx_next->mwait_hint); 1156 else 1157 acpi_cpu_c1(); 1158 end_ticks = cpu_ticks(); 1159 /* acpi_cpu_c1() returns with interrupts enabled. */ 1160 if (cx_next->do_mwait) 1161 ACPI_ENABLE_IRQS(); 1162 end_time = ((end_ticks - start_ticks) << 20) / cpu_tickrate(); 1163 if (!cx_next->do_mwait && curthread->td_critnest == 0) 1164 end_time = min(end_time, 500000 / hz); 1165 sc->cpu_prev_sleep = (sc->cpu_prev_sleep * 3 + end_time) / 4; 1166 return; 1167 } 1168 1169 /* 1170 * For C3, disable bus master arbitration if BM control is available. 1171 * CPU may have to wake up to handle it. Otherwise flush the CPU cache. 1172 */ 1173 if (cx_next->type == ACPI_STATE_C3) { 1174 if ((cpu_quirks & CPU_QUIRK_NO_BM_CTRL) == 0) 1175 AcpiWriteBitRegister(ACPI_BITREG_ARB_DISABLE, 1); 1176 else 1177 ACPI_FLUSH_CPU_CACHE(); 1178 } 1179 1180 /* 1181 * Read from P_LVLx to enter C2(+), checking time spent asleep. 1182 * Use the ACPI timer for measuring sleep time. Since we need to 1183 * get the time very close to the CPU start/stop clock logic, this 1184 * is the only reliable time source. 1185 */ 1186 if (cx_next->type == ACPI_STATE_C3) { 1187 AcpiGetTimer(&start_time); 1188 start_ticks = 0; 1189 } else { 1190 start_time = 0; 1191 start_ticks = cpu_ticks(); 1192 } 1193 if (cx_next->do_mwait) { 1194 acpi_cpu_idle_mwait(cx_next->mwait_hint); 1195 } else { 1196 CPU_GET_REG(cx_next->p_lvlx, 1); 1197 /* 1198 * Read the end time twice. Since it may take an arbitrary time 1199 * to enter the idle state, the first read may be executed before 1200 * the processor has stopped. Doing it again provides enough 1201 * margin that we are certain to have a correct value. 1202 */ 1203 AcpiGetTimer(&end_time); 1204 } 1205 1206 if (cx_next->type == ACPI_STATE_C3) 1207 AcpiGetTimer(&end_time); 1208 else 1209 end_ticks = cpu_ticks(); 1210 1211 /* Enable bus master arbitration. */ 1212 if (cx_next->type == ACPI_STATE_C3 && 1213 (cpu_quirks & CPU_QUIRK_NO_BM_CTRL) == 0) 1214 AcpiWriteBitRegister(ACPI_BITREG_ARB_DISABLE, 0); 1215 ACPI_ENABLE_IRQS(); 1216 1217 if (cx_next->type == ACPI_STATE_C3) 1218 AcpiGetTimerDuration(start_time, end_time, &end_time); 1219 else 1220 end_time = ((end_ticks - start_ticks) << 20) / cpu_tickrate(); 1221 sc->cpu_prev_sleep = (sc->cpu_prev_sleep * 3 + end_time) / 4; 1222} 1223#endif 1224 1225/* 1226 * Re-evaluate the _CST object when we are notified that it changed. 1227 */ 1228static void 1229acpi_cpu_notify(ACPI_HANDLE h, UINT32 notify, void *context) 1230{ 1231 struct acpi_cpu_softc *sc = (struct acpi_cpu_softc *)context; 1232 1233 if (notify != ACPI_NOTIFY_CX_STATES) 1234 return; 1235 1236 /* 1237 * C-state data for target CPU is going to be in flux while we execute 1238 * acpi_cpu_cx_cst, so disable entering acpi_cpu_idle. 1239 * Also, it may happen that multiple ACPI taskqueues may concurrently 1240 * execute notifications for the same CPU. ACPI_SERIAL is used to 1241 * protect against that. 1242 */ 1243 ACPI_SERIAL_BEGIN(cpu); 1244 disable_idle(sc); 1245 1246 /* Update the list of Cx states. */ 1247 acpi_cpu_cx_cst(sc); 1248 acpi_cpu_cx_list(sc); 1249 acpi_cpu_set_cx_lowest(sc); 1250 1251 enable_idle(sc); 1252 ACPI_SERIAL_END(cpu); 1253 1254 acpi_UserNotify("PROCESSOR", sc->cpu_handle, notify); 1255} 1256 1257static void 1258acpi_cpu_quirks(void) 1259{ 1260 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 1261 1262 /* 1263 * Bus mastering arbitration control is needed to keep caches coherent 1264 * while sleeping in C3. If it's not present but a working flush cache 1265 * instruction is present, flush the caches before entering C3 instead. 1266 * Otherwise, just disable C3 completely. 1267 */ 1268 if (AcpiGbl_FADT.Pm2ControlBlock == 0 || 1269 AcpiGbl_FADT.Pm2ControlLength == 0) { 1270 if ((AcpiGbl_FADT.Flags & ACPI_FADT_WBINVD) && 1271 (AcpiGbl_FADT.Flags & ACPI_FADT_WBINVD_FLUSH) == 0) { 1272 cpu_quirks |= CPU_QUIRK_NO_BM_CTRL; 1273 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1274 "acpi_cpu: no BM control, using flush cache method\n")); 1275 } else { 1276 cpu_quirks |= CPU_QUIRK_NO_C3; 1277 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1278 "acpi_cpu: no BM control, C3 not available\n")); 1279 } 1280 } 1281 1282 /* 1283 * If we are using generic Cx mode, C3 on multiple CPUs requires using 1284 * the expensive flush cache instruction. 1285 */ 1286 if (cpu_cx_generic && mp_ncpus > 1) { 1287 cpu_quirks |= CPU_QUIRK_NO_BM_CTRL; 1288 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1289 "acpi_cpu: SMP, using flush cache mode for C3\n")); 1290 } 1291 1292 /* Look for various quirks of the PIIX4 part. */ 1293 acpi_cpu_quirks_piix4(); 1294} 1295 1296static void 1297acpi_cpu_quirks_piix4(void) 1298{ 1299#ifdef __i386__ 1300 device_t acpi_dev; 1301 uint32_t val; 1302 ACPI_STATUS status; 1303 1304 acpi_dev = pci_find_device(PCI_VENDOR_INTEL, PCI_DEVICE_82371AB_3); 1305 if (acpi_dev != NULL) { 1306 switch (pci_get_revid(acpi_dev)) { 1307 /* 1308 * Disable C3 support for all PIIX4 chipsets. Some of these parts 1309 * do not report the BMIDE status to the BM status register and 1310 * others have a livelock bug if Type-F DMA is enabled. Linux 1311 * works around the BMIDE bug by reading the BM status directly 1312 * but we take the simpler approach of disabling C3 for these 1313 * parts. 1314 * 1315 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA 1316 * Livelock") from the January 2002 PIIX4 specification update. 1317 * Applies to all PIIX4 models. 1318 * 1319 * Also, make sure that all interrupts cause a "Stop Break" 1320 * event to exit from C2 state. 1321 * Also, BRLD_EN_BM (ACPI_BITREG_BUS_MASTER_RLD in ACPI-speak) 1322 * should be set to zero, otherwise it causes C2 to short-sleep. 1323 * PIIX4 doesn't properly support C3 and bus master activity 1324 * need not break out of C2. 1325 */ 1326 case PCI_REVISION_A_STEP: 1327 case PCI_REVISION_B_STEP: 1328 case PCI_REVISION_4E: 1329 case PCI_REVISION_4M: 1330 cpu_quirks |= CPU_QUIRK_NO_C3; 1331 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1332 "acpi_cpu: working around PIIX4 bug, disabling C3\n")); 1333 1334 val = pci_read_config(acpi_dev, PIIX4_DEVACTB_REG, 4); 1335 if ((val & PIIX4_STOP_BREAK_MASK) != PIIX4_STOP_BREAK_MASK) { 1336 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1337 "acpi_cpu: PIIX4: enabling IRQs to generate Stop Break\n")); 1338 val |= PIIX4_STOP_BREAK_MASK; 1339 pci_write_config(acpi_dev, PIIX4_DEVACTB_REG, val, 4); 1340 } 1341 status = AcpiReadBitRegister(ACPI_BITREG_BUS_MASTER_RLD, &val); 1342 if (ACPI_SUCCESS(status) && val != 0) { 1343 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1344 "acpi_cpu: PIIX4: reset BRLD_EN_BM\n")); 1345 AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_RLD, 0); 1346 } 1347 break; 1348 default: 1349 break; 1350 } 1351 } 1352#endif 1353} 1354 1355static int 1356acpi_cpu_usage_sysctl(SYSCTL_HANDLER_ARGS) 1357{ 1358 struct acpi_cpu_softc *sc = (struct acpi_cpu_softc *)arg1; 1359 struct sbuf sb; 1360 char buf[128]; 1361 int error, i; 1362 uintmax_t fract, sum, whole; 1363 1364 sbuf_new_for_sysctl(&sb, buf, sizeof(buf), req); 1365 sum = 0; 1366 for (i = 0; i < sc->cpu_cx_count; i++) 1367 sum += sc->cpu_cx_stats[i]; 1368 for (i = 0; i < sc->cpu_cx_count; i++) { 1369 if (sum > 0) { 1370 whole = (uintmax_t)sc->cpu_cx_stats[i] * 100; 1371 fract = (whole % sum) * 100; 1372 sbuf_printf(&sb, "%u.%02u%% ", (u_int)(whole / sum), 1373 (u_int)(fract / sum)); 1374 } else 1375 sbuf_printf(&sb, "0.00%% "); 1376 } 1377 sbuf_printf(&sb, "last %dus", sc->cpu_prev_sleep); 1378 error = sbuf_finish(&sb); 1379 sbuf_delete(&sb); 1380 return (error); 1381} 1382 1383/* 1384 * XXX TODO: actually add support to count each entry/exit 1385 * from the Cx states. 1386 */ 1387static int 1388acpi_cpu_usage_counters_sysctl(SYSCTL_HANDLER_ARGS) 1389{ 1390 struct acpi_cpu_softc *sc = (struct acpi_cpu_softc *)arg1; 1391 struct sbuf sb; 1392 char buf[128]; 1393 int error, i; 1394 1395 sbuf_new_for_sysctl(&sb, buf, sizeof(buf), req); 1396 for (i = 0; i < sc->cpu_cx_count; i++) { 1397 if (i > 0) 1398 sbuf_putc(&sb, ' '); 1399 sbuf_printf(&sb, "%u", sc->cpu_cx_stats[i]); 1400 } 1401 error = sbuf_finish(&sb); 1402 sbuf_delete(&sb); 1403 return (error); 1404} 1405 1406#if defined(__i386__) || defined(__amd64__) 1407static int 1408acpi_cpu_method_sysctl(SYSCTL_HANDLER_ARGS) 1409{ 1410 struct acpi_cpu_softc *sc = (struct acpi_cpu_softc *)arg1; 1411 struct acpi_cx *cx; 1412 struct sbuf sb; 1413 char buf[128]; 1414 int error, i; 1415 1416 sbuf_new_for_sysctl(&sb, buf, sizeof(buf), req); 1417 for (i = 0; i < sc->cpu_cx_count; i++) { 1418 cx = &sc->cpu_cx_states[i]; 1419 if (i > 0) 1420 sbuf_putc(&sb, ' '); 1421 sbuf_printf(&sb, "C%d/", i + 1); 1422 if (cx->do_mwait) { 1423 sbuf_cat(&sb, "mwait"); 1424 if (cx->mwait_hw_coord) 1425 sbuf_cat(&sb, "/hwc"); 1426 if (cx->mwait_bm_avoidance) 1427 sbuf_cat(&sb, "/bma"); 1428 } else if (cx->type == ACPI_STATE_C1) { 1429 sbuf_cat(&sb, "hlt"); 1430 } else { 1431 sbuf_cat(&sb, "io"); 1432 } 1433 if (cx->type == ACPI_STATE_C1 && cx->p_lvlx != NULL) 1434 sbuf_cat(&sb, "/iohlt"); 1435 } 1436 error = sbuf_finish(&sb); 1437 sbuf_delete(&sb); 1438 return (error); 1439} 1440#endif 1441 1442static int 1443acpi_cpu_set_cx_lowest(struct acpi_cpu_softc *sc) 1444{ 1445 int i; 1446 1447 ACPI_SERIAL_ASSERT(cpu); 1448 sc->cpu_cx_lowest = min(sc->cpu_cx_lowest_lim, sc->cpu_cx_count - 1); 1449 1450 /* If not disabling, cache the new lowest non-C3 state. */ 1451 sc->cpu_non_c3 = 0; 1452 for (i = sc->cpu_cx_lowest; i >= 0; i--) { 1453 if (sc->cpu_cx_states[i].type < ACPI_STATE_C3) { 1454 sc->cpu_non_c3 = i; 1455 break; 1456 } 1457 } 1458 1459 /* Reset the statistics counters. */ 1460 bzero(sc->cpu_cx_stats, sizeof(sc->cpu_cx_stats)); 1461 return (0); 1462} 1463 1464static int 1465acpi_cpu_cx_lowest_sysctl(SYSCTL_HANDLER_ARGS) 1466{ 1467 struct acpi_cpu_softc *sc; 1468 char state[8]; 1469 int val, error; 1470 1471 sc = (struct acpi_cpu_softc *) arg1; 1472 snprintf(state, sizeof(state), "C%d", sc->cpu_cx_lowest_lim + 1); 1473 error = sysctl_handle_string(oidp, state, sizeof(state), req); 1474 if (error != 0 || req->newptr == NULL) 1475 return (error); 1476 if (strlen(state) < 2 || toupper(state[0]) != 'C') 1477 return (EINVAL); 1478 if (strcasecmp(state, "Cmax") == 0) 1479 val = MAX_CX_STATES; 1480 else { 1481 val = (int) strtol(state + 1, NULL, 10); 1482 if (val < 1 || val > MAX_CX_STATES) 1483 return (EINVAL); 1484 } 1485 1486 ACPI_SERIAL_BEGIN(cpu); 1487 sc->cpu_cx_lowest_lim = val - 1; 1488 acpi_cpu_set_cx_lowest(sc); 1489 ACPI_SERIAL_END(cpu); 1490 1491 return (0); 1492} 1493 1494static int 1495acpi_cpu_global_cx_lowest_sysctl(SYSCTL_HANDLER_ARGS) 1496{ 1497 struct acpi_cpu_softc *sc; 1498 char state[8]; 1499 int val, error, i; 1500 1501 snprintf(state, sizeof(state), "C%d", cpu_cx_lowest_lim + 1); 1502 error = sysctl_handle_string(oidp, state, sizeof(state), req); 1503 if (error != 0 || req->newptr == NULL) 1504 return (error); 1505 if (strlen(state) < 2 || toupper(state[0]) != 'C') 1506 return (EINVAL); 1507 if (strcasecmp(state, "Cmax") == 0) 1508 val = MAX_CX_STATES; 1509 else { 1510 val = (int) strtol(state + 1, NULL, 10); 1511 if (val < 1 || val > MAX_CX_STATES) 1512 return (EINVAL); 1513 } 1514 1515 /* Update the new lowest useable Cx state for all CPUs. */ 1516 ACPI_SERIAL_BEGIN(cpu); 1517 cpu_cx_lowest_lim = val - 1; 1518 CPU_FOREACH(i) { 1519 if ((sc = cpu_softc[i]) == NULL) 1520 continue; 1521 sc->cpu_cx_lowest_lim = cpu_cx_lowest_lim; 1522 acpi_cpu_set_cx_lowest(sc); 1523 } 1524 ACPI_SERIAL_END(cpu); 1525 1526 return (0); 1527} 1528