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__FBSDID("$FreeBSD: stable/11/sys/dev/acpica/acpi_cpu.c 357656 2020-02-07 15:27:57Z mav $"); 30 31#include "opt_acpi.h" 32#include <sys/param.h> 33#include <sys/bus.h> 34#include <sys/cpu.h> 35#include <sys/kernel.h> 36#include <sys/malloc.h> 37#include <sys/module.h> 38#include <sys/pcpu.h> 39#include <sys/power.h> 40#include <sys/proc.h> 41#include <sys/sched.h> 42#include <sys/sbuf.h> 43#include <sys/smp.h> 44 45#include <dev/pci/pcivar.h> 46#include <machine/atomic.h> 47#include <machine/bus.h> 48#if defined(__amd64__) || defined(__i386__) 49#include <machine/clock.h> 50#include <machine/specialreg.h> 51#include <machine/md_var.h> 52#endif 53#include <sys/rman.h> 54 55#include <contrib/dev/acpica/include/acpi.h> 56#include <contrib/dev/acpica/include/accommon.h> 57 58#include <dev/acpica/acpivar.h> 59 60/* 61 * Support for ACPI Processor devices, including C[1-3] sleep states. 62 */ 63 64/* Hooks for the ACPI CA debugging infrastructure */ 65#define _COMPONENT ACPI_PROCESSOR 66ACPI_MODULE_NAME("PROCESSOR") 67 68struct acpi_cx { 69 struct resource *p_lvlx; /* Register to read to enter state. */ 70 uint32_t type; /* C1-3 (C4 and up treated as C3). */ 71 uint32_t trans_lat; /* Transition latency (usec). */ 72 uint32_t power; /* Power consumed (mW). */ 73 int res_type; /* Resource type for p_lvlx. */ 74 int res_rid; /* Resource ID for p_lvlx. */ 75 bool do_mwait; 76 uint32_t mwait_hint; 77 bool mwait_hw_coord; 78 bool mwait_bm_avoidance; 79}; 80#define MAX_CX_STATES 8 81 82struct acpi_cpu_softc { 83 device_t cpu_dev; 84 ACPI_HANDLE cpu_handle; 85 struct pcpu *cpu_pcpu; 86 uint32_t cpu_acpi_id; /* ACPI processor id */ 87 uint32_t cpu_p_blk; /* ACPI P_BLK location */ 88 uint32_t cpu_p_blk_len; /* P_BLK length (must be 6). */ 89 struct acpi_cx cpu_cx_states[MAX_CX_STATES]; 90 int cpu_cx_count; /* Number of valid Cx states. */ 91 int cpu_prev_sleep;/* Last idle sleep duration. */ 92 int cpu_features; /* Child driver supported features. */ 93 /* Runtime state. */ 94 int cpu_non_c2; /* Index of lowest non-C2 state. */ 95 int cpu_non_c3; /* Index of lowest non-C3 state. */ 96 u_int cpu_cx_stats[MAX_CX_STATES];/* Cx usage history. */ 97 /* Values for sysctl. */ 98 struct sysctl_ctx_list cpu_sysctl_ctx; 99 struct sysctl_oid *cpu_sysctl_tree; 100 int cpu_cx_lowest; 101 int cpu_cx_lowest_lim; 102 int cpu_disable_idle; /* Disable entry to idle function */ 103 char cpu_cx_supported[64]; 104}; 105 106struct acpi_cpu_device { 107 struct resource_list ad_rl; 108}; 109 110#define CPU_GET_REG(reg, width) \ 111 (bus_space_read_ ## width(rman_get_bustag((reg)), \ 112 rman_get_bushandle((reg)), 0)) 113#define CPU_SET_REG(reg, width, val) \ 114 (bus_space_write_ ## width(rman_get_bustag((reg)), \ 115 rman_get_bushandle((reg)), 0, (val))) 116 117#define PM_USEC(x) ((x) >> 2) /* ~4 clocks per usec (3.57955 Mhz) */ 118 119#define ACPI_NOTIFY_CX_STATES 0x81 /* _CST changed. */ 120 121#define CPU_QUIRK_NO_C3 (1<<0) /* C3-type states are not usable. */ 122#define CPU_QUIRK_NO_BM_CTRL (1<<2) /* No bus mastering control. */ 123 124#define PCI_VENDOR_INTEL 0x8086 125#define PCI_DEVICE_82371AB_3 0x7113 /* PIIX4 chipset for quirks. */ 126#define PCI_REVISION_A_STEP 0 127#define PCI_REVISION_B_STEP 1 128#define PCI_REVISION_4E 2 129#define PCI_REVISION_4M 3 130#define PIIX4_DEVACTB_REG 0x58 131#define PIIX4_BRLD_EN_IRQ0 (1<<0) 132#define PIIX4_BRLD_EN_IRQ (1<<1) 133#define PIIX4_BRLD_EN_IRQ8 (1<<5) 134#define PIIX4_STOP_BREAK_MASK (PIIX4_BRLD_EN_IRQ0 | PIIX4_BRLD_EN_IRQ | PIIX4_BRLD_EN_IRQ8) 135#define PIIX4_PCNTRL_BST_EN (1<<10) 136 137#define CST_FFH_VENDOR_INTEL 1 138#define CST_FFH_INTEL_CL_C1IO 1 139#define CST_FFH_INTEL_CL_MWAIT 2 140#define CST_FFH_MWAIT_HW_COORD 0x0001 141#define CST_FFH_MWAIT_BM_AVOID 0x0002 142 143#define CPUDEV_DEVICE_ID "ACPI0007" 144 145/* Allow users to ignore processor orders in MADT. */ 146static int cpu_unordered; 147SYSCTL_INT(_debug_acpi, OID_AUTO, cpu_unordered, CTLFLAG_RDTUN, 148 &cpu_unordered, 0, 149 "Do not use the MADT to match ACPI Processor objects to CPUs."); 150 151/* Knob to disable acpi_cpu devices */ 152bool acpi_cpu_disabled = false; 153 154/* Platform hardware resource information. */ 155static uint32_t cpu_smi_cmd; /* Value to write to SMI_CMD. */ 156static uint8_t cpu_cst_cnt; /* Indicate we are _CST aware. */ 157static int cpu_quirks; /* Indicate any hardware bugs. */ 158 159/* Values for sysctl. */ 160static struct sysctl_ctx_list cpu_sysctl_ctx; 161static struct sysctl_oid *cpu_sysctl_tree; 162static int cpu_cx_generic; 163static int cpu_cx_lowest_lim; 164 165static device_t *cpu_devices; 166static int cpu_ndevices; 167static struct acpi_cpu_softc **cpu_softc; 168ACPI_SERIAL_DECL(cpu, "ACPI CPU"); 169 170static int acpi_cpu_probe(device_t dev); 171static int acpi_cpu_attach(device_t dev); 172static int acpi_cpu_suspend(device_t dev); 173static int acpi_cpu_resume(device_t dev); 174static int acpi_pcpu_get_id(device_t dev, uint32_t *acpi_id, 175 uint32_t *cpu_id); 176static struct resource_list *acpi_cpu_get_rlist(device_t dev, device_t child); 177static device_t acpi_cpu_add_child(device_t dev, u_int order, const char *name, 178 int unit); 179static int acpi_cpu_read_ivar(device_t dev, device_t child, int index, 180 uintptr_t *result); 181static int acpi_cpu_shutdown(device_t dev); 182static void acpi_cpu_cx_probe(struct acpi_cpu_softc *sc); 183static void acpi_cpu_generic_cx_probe(struct acpi_cpu_softc *sc); 184static int acpi_cpu_cx_cst(struct acpi_cpu_softc *sc); 185static void acpi_cpu_startup(void *arg); 186static void acpi_cpu_startup_cx(struct acpi_cpu_softc *sc); 187static void acpi_cpu_cx_list(struct acpi_cpu_softc *sc); 188#if defined(__i386__) || defined(__amd64__) 189static void acpi_cpu_idle(sbintime_t sbt); 190#endif 191static void acpi_cpu_notify(ACPI_HANDLE h, UINT32 notify, void *context); 192static void acpi_cpu_quirks(void); 193static void acpi_cpu_quirks_piix4(void); 194static int acpi_cpu_usage_sysctl(SYSCTL_HANDLER_ARGS); 195static int acpi_cpu_usage_counters_sysctl(SYSCTL_HANDLER_ARGS); 196static int acpi_cpu_set_cx_lowest(struct acpi_cpu_softc *sc); 197static int acpi_cpu_cx_lowest_sysctl(SYSCTL_HANDLER_ARGS); 198static int acpi_cpu_global_cx_lowest_sysctl(SYSCTL_HANDLER_ARGS); 199#if defined(__i386__) || defined(__amd64__) 200static int acpi_cpu_method_sysctl(SYSCTL_HANDLER_ARGS); 201#endif 202 203static device_method_t acpi_cpu_methods[] = { 204 /* Device interface */ 205 DEVMETHOD(device_probe, acpi_cpu_probe), 206 DEVMETHOD(device_attach, acpi_cpu_attach), 207 DEVMETHOD(device_detach, bus_generic_detach), 208 DEVMETHOD(device_shutdown, acpi_cpu_shutdown), 209 DEVMETHOD(device_suspend, acpi_cpu_suspend), 210 DEVMETHOD(device_resume, acpi_cpu_resume), 211 212 /* Bus interface */ 213 DEVMETHOD(bus_add_child, acpi_cpu_add_child), 214 DEVMETHOD(bus_read_ivar, acpi_cpu_read_ivar), 215 DEVMETHOD(bus_get_resource_list, acpi_cpu_get_rlist), 216 DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource), 217 DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource), 218 DEVMETHOD(bus_alloc_resource, bus_generic_rl_alloc_resource), 219 DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource), 220 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 221 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 222 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 223 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 224 225 DEVMETHOD_END 226}; 227 228static driver_t acpi_cpu_driver = { 229 "cpu", 230 acpi_cpu_methods, 231 sizeof(struct acpi_cpu_softc), 232}; 233 234static devclass_t acpi_cpu_devclass; 235DRIVER_MODULE(cpu, acpi, acpi_cpu_driver, acpi_cpu_devclass, 0, 0); 236MODULE_DEPEND(cpu, acpi, 1, 1, 1); 237 238static int 239acpi_cpu_probe(device_t dev) 240{ 241 static char *cpudev_ids[] = { CPUDEV_DEVICE_ID, NULL }; 242 int acpi_id, cpu_id; 243 ACPI_BUFFER buf; 244 ACPI_HANDLE handle; 245 ACPI_OBJECT *obj; 246 ACPI_STATUS status; 247 ACPI_OBJECT_TYPE type; 248 249 if (acpi_disabled("cpu") || acpi_cpu_disabled) 250 return (ENXIO); 251 type = acpi_get_type(dev); 252 if (type != ACPI_TYPE_PROCESSOR && type != ACPI_TYPE_DEVICE) 253 return (ENXIO); 254 if (type == ACPI_TYPE_DEVICE && 255 ACPI_ID_PROBE(device_get_parent(dev), dev, cpudev_ids) == NULL) 256 return (ENXIO); 257 258 handle = acpi_get_handle(dev); 259 if (cpu_softc == NULL) 260 cpu_softc = malloc(sizeof(struct acpi_cpu_softc *) * 261 (mp_maxid + 1), M_TEMP /* XXX */, M_WAITOK | M_ZERO); 262 263 if (type == ACPI_TYPE_PROCESSOR) { 264 /* Get our Processor object. */ 265 buf.Pointer = NULL; 266 buf.Length = ACPI_ALLOCATE_BUFFER; 267 status = AcpiEvaluateObject(handle, NULL, NULL, &buf); 268 if (ACPI_FAILURE(status)) { 269 device_printf(dev, "probe failed to get Processor obj - %s\n", 270 AcpiFormatException(status)); 271 return (ENXIO); 272 } 273 obj = (ACPI_OBJECT *)buf.Pointer; 274 if (obj->Type != ACPI_TYPE_PROCESSOR) { 275 device_printf(dev, "Processor object has bad type %d\n", 276 obj->Type); 277 AcpiOsFree(obj); 278 return (ENXIO); 279 } 280 281 /* 282 * Find the processor associated with our unit. We could use the 283 * ProcId as a key, however, some boxes do not have the same values 284 * in their Processor object as the ProcId values in the MADT. 285 */ 286 acpi_id = obj->Processor.ProcId; 287 AcpiOsFree(obj); 288 } else { 289 status = acpi_GetInteger(handle, "_UID", &acpi_id); 290 if (ACPI_FAILURE(status)) { 291 device_printf(dev, "Device object has bad value - %s\n", 292 AcpiFormatException(status)); 293 return (ENXIO); 294 } 295 } 296 if (acpi_pcpu_get_id(dev, &acpi_id, &cpu_id) != 0) 297 return (ENXIO); 298 299 /* 300 * Check if we already probed this processor. We scan the bus twice 301 * so it's possible we've already seen this one. 302 */ 303 if (cpu_softc[cpu_id] != NULL) 304 return (ENXIO); 305 306 /* Mark this processor as in-use and save our derived id for attach. */ 307 cpu_softc[cpu_id] = (void *)1; 308 acpi_set_private(dev, (void*)(intptr_t)cpu_id); 309 device_set_desc(dev, "ACPI CPU"); 310 311 return (0); 312} 313 314static int 315acpi_cpu_attach(device_t dev) 316{ 317 ACPI_BUFFER buf; 318 ACPI_OBJECT arg, *obj; 319 ACPI_OBJECT_LIST arglist; 320 struct pcpu *pcpu_data; 321 struct acpi_cpu_softc *sc; 322 struct acpi_softc *acpi_sc; 323 ACPI_STATUS status; 324 u_int features; 325 int cpu_id, drv_count, i; 326 driver_t **drivers; 327 uint32_t cap_set[3]; 328 329 /* UUID needed by _OSC evaluation */ 330 static uint8_t cpu_oscuuid[16] = { 0x16, 0xA6, 0x77, 0x40, 0x0C, 0x29, 331 0xBE, 0x47, 0x9E, 0xBD, 0xD8, 0x70, 332 0x58, 0x71, 0x39, 0x53 }; 333 334 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 335 336 sc = device_get_softc(dev); 337 sc->cpu_dev = dev; 338 sc->cpu_handle = acpi_get_handle(dev); 339 cpu_id = (int)(intptr_t)acpi_get_private(dev); 340 cpu_softc[cpu_id] = sc; 341 pcpu_data = pcpu_find(cpu_id); 342 pcpu_data->pc_device = dev; 343 sc->cpu_pcpu = pcpu_data; 344 cpu_smi_cmd = AcpiGbl_FADT.SmiCommand; 345 cpu_cst_cnt = AcpiGbl_FADT.CstControl; 346 347 if (acpi_get_type(dev) == ACPI_TYPE_PROCESSOR) { 348 buf.Pointer = NULL; 349 buf.Length = ACPI_ALLOCATE_BUFFER; 350 status = AcpiEvaluateObject(sc->cpu_handle, NULL, NULL, &buf); 351 if (ACPI_FAILURE(status)) { 352 device_printf(dev, "attach failed to get Processor obj - %s\n", 353 AcpiFormatException(status)); 354 return (ENXIO); 355 } 356 obj = (ACPI_OBJECT *)buf.Pointer; 357 sc->cpu_p_blk = obj->Processor.PblkAddress; 358 sc->cpu_p_blk_len = obj->Processor.PblkLength; 359 sc->cpu_acpi_id = obj->Processor.ProcId; 360 AcpiOsFree(obj); 361 } else { 362 KASSERT(acpi_get_type(dev) == ACPI_TYPE_DEVICE, 363 ("Unexpected ACPI object")); 364 status = acpi_GetInteger(sc->cpu_handle, "_UID", &sc->cpu_acpi_id); 365 if (ACPI_FAILURE(status)) { 366 device_printf(dev, "Device object has bad value - %s\n", 367 AcpiFormatException(status)); 368 return (ENXIO); 369 } 370 sc->cpu_p_blk = 0; 371 sc->cpu_p_blk_len = 0; 372 } 373 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "acpi_cpu%d: P_BLK at %#x/%d\n", 374 device_get_unit(dev), sc->cpu_p_blk, sc->cpu_p_blk_len)); 375 376 /* 377 * If this is the first cpu we attach, create and initialize the generic 378 * resources that will be used by all acpi cpu devices. 379 */ 380 if (device_get_unit(dev) == 0) { 381 /* Assume we won't be using generic Cx mode by default */ 382 cpu_cx_generic = FALSE; 383 384 /* Install hw.acpi.cpu sysctl tree */ 385 acpi_sc = acpi_device_get_parent_softc(dev); 386 sysctl_ctx_init(&cpu_sysctl_ctx); 387 cpu_sysctl_tree = SYSCTL_ADD_NODE(&cpu_sysctl_ctx, 388 SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree), OID_AUTO, "cpu", 389 CTLFLAG_RD, 0, "node for CPU children"); 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#endif 409 410 if (devclass_get_drivers(acpi_cpu_devclass, &drivers, &drv_count) == 0) { 411 for (i = 0; i < drv_count; i++) { 412 if (ACPI_GET_FEATURES(drivers[i], &features) == 0) 413 sc->cpu_features |= features; 414 } 415 free(drivers, M_TEMP); 416 } 417 418 /* 419 * CPU capabilities are specified in 420 * Intel Processor Vendor-Specific ACPI Interface Specification. 421 */ 422 if (sc->cpu_features) { 423 cap_set[1] = sc->cpu_features; 424 status = acpi_EvaluateOSC(sc->cpu_handle, cpu_oscuuid, 1, 2, cap_set, 425 cap_set, false); 426 if (ACPI_SUCCESS(status)) { 427 if (cap_set[0] != 0) 428 device_printf(dev, "_OSC returned status %#x\n", cap_set[0]); 429 } 430 else { 431 arglist.Pointer = &arg; 432 arglist.Count = 1; 433 arg.Type = ACPI_TYPE_BUFFER; 434 arg.Buffer.Length = sizeof(cap_set); 435 arg.Buffer.Pointer = (uint8_t *)cap_set; 436 cap_set[0] = 1; /* revision */ 437 cap_set[1] = 1; /* number of capabilities integers */ 438 cap_set[2] = sc->cpu_features; 439 AcpiEvaluateObject(sc->cpu_handle, "_PDC", &arglist, NULL); 440 } 441 } 442 443 /* Probe for Cx state support. */ 444 acpi_cpu_cx_probe(sc); 445 446 return (0); 447} 448 449static void 450acpi_cpu_postattach(void *unused __unused) 451{ 452 device_t *devices; 453 int err; 454 int i, n; 455 int attached; 456 457 err = devclass_get_devices(acpi_cpu_devclass, &devices, &n); 458 if (err != 0) { 459 printf("devclass_get_devices(acpi_cpu_devclass) failed\n"); 460 return; 461 } 462 attached = 0; 463 for (i = 0; i < n; i++) 464 if (device_is_attached(devices[i]) && 465 device_get_driver(devices[i]) == &acpi_cpu_driver) 466 attached = 1; 467 for (i = 0; i < n; i++) 468 bus_generic_probe(devices[i]); 469 for (i = 0; i < n; i++) 470 bus_generic_attach(devices[i]); 471 free(devices, M_TEMP); 472 473 if (attached) { 474#ifdef EARLY_AP_STARTUP 475 acpi_cpu_startup(NULL); 476#else 477 /* Queue post cpu-probing task handler */ 478 AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_cpu_startup, NULL); 479#endif 480 } 481} 482 483SYSINIT(acpi_cpu, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, 484 acpi_cpu_postattach, NULL); 485 486static void 487disable_idle(struct acpi_cpu_softc *sc) 488{ 489 cpuset_t cpuset; 490 491 CPU_SETOF(sc->cpu_pcpu->pc_cpuid, &cpuset); 492 sc->cpu_disable_idle = TRUE; 493 494 /* 495 * Ensure that the CPU is not in idle state or in acpi_cpu_idle(). 496 * Note that this code depends on the fact that the rendezvous IPI 497 * can not penetrate context where interrupts are disabled and acpi_cpu_idle 498 * is called and executed in such a context with interrupts being re-enabled 499 * right before return. 500 */ 501 smp_rendezvous_cpus(cpuset, smp_no_rendezvous_barrier, NULL, 502 smp_no_rendezvous_barrier, NULL); 503} 504 505static void 506enable_idle(struct acpi_cpu_softc *sc) 507{ 508 509 sc->cpu_disable_idle = FALSE; 510} 511 512#if defined(__i386__) || defined(__amd64__) 513static int 514is_idle_disabled(struct acpi_cpu_softc *sc) 515{ 516 517 return (sc->cpu_disable_idle); 518} 519#endif 520 521/* 522 * Disable any entry to the idle function during suspend and re-enable it 523 * during resume. 524 */ 525static int 526acpi_cpu_suspend(device_t dev) 527{ 528 int error; 529 530 error = bus_generic_suspend(dev); 531 if (error) 532 return (error); 533 disable_idle(device_get_softc(dev)); 534 return (0); 535} 536 537static int 538acpi_cpu_resume(device_t dev) 539{ 540 541 enable_idle(device_get_softc(dev)); 542 return (bus_generic_resume(dev)); 543} 544 545/* 546 * Find the processor associated with a given ACPI ID. By default, 547 * use the MADT to map ACPI IDs to APIC IDs and use that to locate a 548 * processor. Some systems have inconsistent ASL and MADT however. 549 * For these systems the cpu_unordered tunable can be set in which 550 * case we assume that Processor objects are listed in the same order 551 * in both the MADT and ASL. 552 */ 553static int 554acpi_pcpu_get_id(device_t dev, uint32_t *acpi_id, uint32_t *cpu_id) 555{ 556 struct pcpu *pc; 557 uint32_t i, idx; 558 559 KASSERT(acpi_id != NULL, ("Null acpi_id")); 560 KASSERT(cpu_id != NULL, ("Null cpu_id")); 561 idx = device_get_unit(dev); 562 563 /* 564 * If pc_acpi_id for CPU 0 is not initialized (e.g. a non-APIC 565 * UP box) use the ACPI ID from the first processor we find. 566 */ 567 if (idx == 0 && mp_ncpus == 1) { 568 pc = pcpu_find(0); 569 if (pc->pc_acpi_id == 0xffffffff) 570 pc->pc_acpi_id = *acpi_id; 571 *cpu_id = 0; 572 return (0); 573 } 574 575 CPU_FOREACH(i) { 576 pc = pcpu_find(i); 577 KASSERT(pc != NULL, ("no pcpu data for %d", i)); 578 if (cpu_unordered) { 579 if (idx-- == 0) { 580 /* 581 * If pc_acpi_id doesn't match the ACPI ID from the 582 * ASL, prefer the MADT-derived value. 583 */ 584 if (pc->pc_acpi_id != *acpi_id) 585 *acpi_id = pc->pc_acpi_id; 586 *cpu_id = pc->pc_cpuid; 587 return (0); 588 } 589 } else { 590 if (pc->pc_acpi_id == *acpi_id) { 591 if (bootverbose) 592 device_printf(dev, 593 "Processor %s (ACPI ID %u) -> APIC ID %d\n", 594 acpi_name(acpi_get_handle(dev)), *acpi_id, 595 pc->pc_cpuid); 596 *cpu_id = pc->pc_cpuid; 597 return (0); 598 } 599 } 600 } 601 602 if (bootverbose) 603 printf("ACPI: Processor %s (ACPI ID %u) ignored\n", 604 acpi_name(acpi_get_handle(dev)), *acpi_id); 605 606 return (ESRCH); 607} 608 609static struct resource_list * 610acpi_cpu_get_rlist(device_t dev, device_t child) 611{ 612 struct acpi_cpu_device *ad; 613 614 ad = device_get_ivars(child); 615 if (ad == NULL) 616 return (NULL); 617 return (&ad->ad_rl); 618} 619 620static device_t 621acpi_cpu_add_child(device_t dev, u_int order, const char *name, int unit) 622{ 623 struct acpi_cpu_device *ad; 624 device_t child; 625 626 if ((ad = malloc(sizeof(*ad), M_TEMP, M_NOWAIT | M_ZERO)) == NULL) 627 return (NULL); 628 629 resource_list_init(&ad->ad_rl); 630 631 child = device_add_child_ordered(dev, order, name, unit); 632 if (child != NULL) 633 device_set_ivars(child, ad); 634 else 635 free(ad, M_TEMP); 636 return (child); 637} 638 639static int 640acpi_cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result) 641{ 642 struct acpi_cpu_softc *sc; 643 644 sc = device_get_softc(dev); 645 switch (index) { 646 case ACPI_IVAR_HANDLE: 647 *result = (uintptr_t)sc->cpu_handle; 648 break; 649 case CPU_IVAR_PCPU: 650 *result = (uintptr_t)sc->cpu_pcpu; 651 break; 652#if defined(__amd64__) || defined(__i386__) 653 case CPU_IVAR_NOMINAL_MHZ: 654 if (tsc_is_invariant) { 655 *result = (uintptr_t)(atomic_load_acq_64(&tsc_freq) / 1000000); 656 break; 657 } 658 /* FALLTHROUGH */ 659#endif 660 default: 661 return (ENOENT); 662 } 663 return (0); 664} 665 666static int 667acpi_cpu_shutdown(device_t dev) 668{ 669 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 670 671 /* Allow children to shutdown first. */ 672 bus_generic_shutdown(dev); 673 674 /* 675 * Disable any entry to the idle function. 676 */ 677 disable_idle(device_get_softc(dev)); 678 679 /* 680 * CPU devices are not truly detached and remain referenced, 681 * so their resources are not freed. 682 */ 683 684 return_VALUE (0); 685} 686 687static void 688acpi_cpu_cx_probe(struct acpi_cpu_softc *sc) 689{ 690 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 691 692 /* Use initial sleep value of 1 sec. to start with lowest idle state. */ 693 sc->cpu_prev_sleep = 1000000; 694 sc->cpu_cx_lowest = 0; 695 sc->cpu_cx_lowest_lim = 0; 696 697 /* 698 * Check for the ACPI 2.0 _CST sleep states object. If we can't find 699 * any, we'll revert to generic FADT/P_BLK Cx control method which will 700 * be handled by acpi_cpu_startup. We need to defer to after having 701 * probed all the cpus in the system before probing for generic Cx 702 * states as we may already have found cpus with valid _CST packages 703 */ 704 if (!cpu_cx_generic && acpi_cpu_cx_cst(sc) != 0) { 705 /* 706 * We were unable to find a _CST package for this cpu or there 707 * was an error parsing it. Switch back to generic mode. 708 */ 709 cpu_cx_generic = TRUE; 710 if (bootverbose) 711 device_printf(sc->cpu_dev, "switching to generic Cx mode\n"); 712 } 713 714 /* 715 * TODO: _CSD Package should be checked here. 716 */ 717} 718 719static void 720acpi_cpu_generic_cx_probe(struct acpi_cpu_softc *sc) 721{ 722 ACPI_GENERIC_ADDRESS gas; 723 struct acpi_cx *cx_ptr; 724 725 sc->cpu_cx_count = 0; 726 cx_ptr = sc->cpu_cx_states; 727 728 /* Use initial sleep value of 1 sec. to start with lowest idle state. */ 729 sc->cpu_prev_sleep = 1000000; 730 731 /* C1 has been required since just after ACPI 1.0 */ 732 cx_ptr->type = ACPI_STATE_C1; 733 cx_ptr->trans_lat = 0; 734 cx_ptr++; 735 sc->cpu_non_c2 = sc->cpu_cx_count; 736 sc->cpu_non_c3 = sc->cpu_cx_count; 737 sc->cpu_cx_count++; 738 739 /* 740 * The spec says P_BLK must be 6 bytes long. However, some systems 741 * use it to indicate a fractional set of features present so we 742 * take 5 as C2. Some may also have a value of 7 to indicate 743 * another C3 but most use _CST for this (as required) and having 744 * "only" C1-C3 is not a hardship. 745 */ 746 if (sc->cpu_p_blk_len < 5) 747 return; 748 749 /* Validate and allocate resources for C2 (P_LVL2). */ 750 gas.SpaceId = ACPI_ADR_SPACE_SYSTEM_IO; 751 gas.BitWidth = 8; 752 if (AcpiGbl_FADT.C2Latency <= 100) { 753 gas.Address = sc->cpu_p_blk + 4; 754 cx_ptr->res_rid = 0; 755 acpi_bus_alloc_gas(sc->cpu_dev, &cx_ptr->res_type, &cx_ptr->res_rid, 756 &gas, &cx_ptr->p_lvlx, RF_SHAREABLE); 757 if (cx_ptr->p_lvlx != NULL) { 758 cx_ptr->type = ACPI_STATE_C2; 759 cx_ptr->trans_lat = AcpiGbl_FADT.C2Latency; 760 cx_ptr++; 761 sc->cpu_non_c3 = sc->cpu_cx_count; 762 sc->cpu_cx_count++; 763 } 764 } 765 if (sc->cpu_p_blk_len < 6) 766 return; 767 768 /* Validate and allocate resources for C3 (P_LVL3). */ 769 if (AcpiGbl_FADT.C3Latency <= 1000 && !(cpu_quirks & CPU_QUIRK_NO_C3)) { 770 gas.Address = sc->cpu_p_blk + 5; 771 cx_ptr->res_rid = 1; 772 acpi_bus_alloc_gas(sc->cpu_dev, &cx_ptr->res_type, &cx_ptr->res_rid, 773 &gas, &cx_ptr->p_lvlx, RF_SHAREABLE); 774 if (cx_ptr->p_lvlx != NULL) { 775 cx_ptr->type = ACPI_STATE_C3; 776 cx_ptr->trans_lat = AcpiGbl_FADT.C3Latency; 777 cx_ptr++; 778 sc->cpu_cx_count++; 779 } 780 } 781} 782 783#if defined(__i386__) || defined(__amd64__) 784static void 785acpi_cpu_cx_cst_mwait(struct acpi_cx *cx_ptr, uint64_t address, int accsize) 786{ 787 788 cx_ptr->do_mwait = true; 789 cx_ptr->mwait_hint = address & 0xffffffff; 790 cx_ptr->mwait_hw_coord = (accsize & CST_FFH_MWAIT_HW_COORD) != 0; 791 cx_ptr->mwait_bm_avoidance = (accsize & CST_FFH_MWAIT_BM_AVOID) != 0; 792} 793#endif 794 795static void 796acpi_cpu_cx_cst_free_plvlx(device_t cpu_dev, struct acpi_cx *cx_ptr) 797{ 798 799 if (cx_ptr->p_lvlx == NULL) 800 return; 801 bus_release_resource(cpu_dev, cx_ptr->res_type, cx_ptr->res_rid, 802 cx_ptr->p_lvlx); 803 cx_ptr->p_lvlx = NULL; 804} 805 806/* 807 * Parse a _CST package and set up its Cx states. Since the _CST object 808 * can change dynamically, our notify handler may call this function 809 * to clean up and probe the new _CST package. 810 */ 811static int 812acpi_cpu_cx_cst(struct acpi_cpu_softc *sc) 813{ 814 struct acpi_cx *cx_ptr; 815 ACPI_STATUS status; 816 ACPI_BUFFER buf; 817 ACPI_OBJECT *top; 818 ACPI_OBJECT *pkg; 819 uint32_t count; 820 int i; 821#if defined(__i386__) || defined(__amd64__) 822 uint64_t address; 823 int vendor, class, accsize; 824#endif 825 826 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 827 828 buf.Pointer = NULL; 829 buf.Length = ACPI_ALLOCATE_BUFFER; 830 status = AcpiEvaluateObject(sc->cpu_handle, "_CST", NULL, &buf); 831 if (ACPI_FAILURE(status)) 832 return (ENXIO); 833 834 /* _CST is a package with a count and at least one Cx package. */ 835 top = (ACPI_OBJECT *)buf.Pointer; 836 if (!ACPI_PKG_VALID(top, 2) || acpi_PkgInt32(top, 0, &count) != 0) { 837 device_printf(sc->cpu_dev, "invalid _CST package\n"); 838 AcpiOsFree(buf.Pointer); 839 return (ENXIO); 840 } 841 if (count != top->Package.Count - 1) { 842 device_printf(sc->cpu_dev, "invalid _CST state count (%d != %d)\n", 843 count, top->Package.Count - 1); 844 count = top->Package.Count - 1; 845 } 846 if (count > MAX_CX_STATES) { 847 device_printf(sc->cpu_dev, "_CST has too many states (%d)\n", count); 848 count = MAX_CX_STATES; 849 } 850 851 sc->cpu_non_c2 = 0; 852 sc->cpu_non_c3 = 0; 853 sc->cpu_cx_count = 0; 854 cx_ptr = sc->cpu_cx_states; 855 856 /* 857 * C1 has been required since just after ACPI 1.0. 858 * Reserve the first slot for it. 859 */ 860 cx_ptr->type = ACPI_STATE_C0; 861 cx_ptr++; 862 sc->cpu_cx_count++; 863 864 /* Set up all valid states. */ 865 for (i = 0; i < count; i++) { 866 pkg = &top->Package.Elements[i + 1]; 867 if (!ACPI_PKG_VALID(pkg, 4) || 868 acpi_PkgInt32(pkg, 1, &cx_ptr->type) != 0 || 869 acpi_PkgInt32(pkg, 2, &cx_ptr->trans_lat) != 0 || 870 acpi_PkgInt32(pkg, 3, &cx_ptr->power) != 0) { 871 872 device_printf(sc->cpu_dev, "skipping invalid Cx state package\n"); 873 continue; 874 } 875 876 /* Validate the state to see if we should use it. */ 877 switch (cx_ptr->type) { 878 case ACPI_STATE_C1: 879 acpi_cpu_cx_cst_free_plvlx(sc->cpu_dev, cx_ptr); 880#if defined(__i386__) || defined(__amd64__) 881 if (acpi_PkgFFH_IntelCpu(pkg, 0, &vendor, &class, &address, 882 &accsize) == 0 && vendor == CST_FFH_VENDOR_INTEL) { 883 if (class == CST_FFH_INTEL_CL_C1IO) { 884 /* C1 I/O then Halt */ 885 cx_ptr->res_rid = sc->cpu_cx_count; 886 bus_set_resource(sc->cpu_dev, SYS_RES_IOPORT, 887 cx_ptr->res_rid, address, 1); 888 cx_ptr->p_lvlx = bus_alloc_resource_any(sc->cpu_dev, 889 SYS_RES_IOPORT, &cx_ptr->res_rid, RF_ACTIVE | 890 RF_SHAREABLE); 891 if (cx_ptr->p_lvlx == NULL) { 892 bus_delete_resource(sc->cpu_dev, SYS_RES_IOPORT, 893 cx_ptr->res_rid); 894 device_printf(sc->cpu_dev, 895 "C1 I/O failed to allocate port %d, " 896 "degrading to C1 Halt", (int)address); 897 } 898 } else if (class == CST_FFH_INTEL_CL_MWAIT) { 899 acpi_cpu_cx_cst_mwait(cx_ptr, address, accsize); 900 } 901 } 902#endif 903 if (sc->cpu_cx_states[0].type == ACPI_STATE_C0) { 904 /* This is the first C1 state. Use the reserved slot. */ 905 sc->cpu_cx_states[0] = *cx_ptr; 906 } else { 907 sc->cpu_non_c2 = sc->cpu_cx_count; 908 sc->cpu_non_c3 = sc->cpu_cx_count; 909 cx_ptr++; 910 sc->cpu_cx_count++; 911 } 912 continue; 913 case ACPI_STATE_C2: 914 sc->cpu_non_c3 = sc->cpu_cx_count; 915 break; 916 case ACPI_STATE_C3: 917 default: 918 if ((cpu_quirks & CPU_QUIRK_NO_C3) != 0) { 919 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 920 "acpi_cpu%d: C3[%d] not available.\n", 921 device_get_unit(sc->cpu_dev), i)); 922 continue; 923 } 924 break; 925 } 926 927 /* Free up any previous register. */ 928 acpi_cpu_cx_cst_free_plvlx(sc->cpu_dev, cx_ptr); 929 930 /* Allocate the control register for C2 or C3. */ 931#if defined(__i386__) || defined(__amd64__) 932 if (acpi_PkgFFH_IntelCpu(pkg, 0, &vendor, &class, &address, 933 &accsize) == 0 && vendor == CST_FFH_VENDOR_INTEL && 934 class == CST_FFH_INTEL_CL_MWAIT) { 935 /* Native C State Instruction use (mwait) */ 936 acpi_cpu_cx_cst_mwait(cx_ptr, address, accsize); 937 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 938 "acpi_cpu%d: Got C%d/mwait - %d latency\n", 939 device_get_unit(sc->cpu_dev), cx_ptr->type, cx_ptr->trans_lat)); 940 cx_ptr++; 941 sc->cpu_cx_count++; 942 } else 943#endif 944 { 945 cx_ptr->res_rid = sc->cpu_cx_count; 946 acpi_PkgGas(sc->cpu_dev, pkg, 0, &cx_ptr->res_type, 947 &cx_ptr->res_rid, &cx_ptr->p_lvlx, RF_SHAREABLE); 948 if (cx_ptr->p_lvlx) { 949 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 950 "acpi_cpu%d: Got C%d - %d latency\n", 951 device_get_unit(sc->cpu_dev), cx_ptr->type, 952 cx_ptr->trans_lat)); 953 cx_ptr++; 954 sc->cpu_cx_count++; 955 } 956 } 957 } 958 AcpiOsFree(buf.Pointer); 959 960 /* If C1 state was not found, we need one now. */ 961 cx_ptr = sc->cpu_cx_states; 962 if (cx_ptr->type == ACPI_STATE_C0) { 963 cx_ptr->type = ACPI_STATE_C1; 964 cx_ptr->trans_lat = 0; 965 } 966 967 return (0); 968} 969 970/* 971 * Call this *after* all CPUs have been attached. 972 */ 973static void 974acpi_cpu_startup(void *arg) 975{ 976 struct acpi_cpu_softc *sc; 977 int i; 978 979 /* Get set of CPU devices */ 980 devclass_get_devices(acpi_cpu_devclass, &cpu_devices, &cpu_ndevices); 981 982 /* 983 * Setup any quirks that might necessary now that we have probed 984 * all the CPUs 985 */ 986 acpi_cpu_quirks(); 987 988 if (cpu_cx_generic) { 989 /* 990 * We are using generic Cx mode, probe for available Cx states 991 * for all processors. 992 */ 993 for (i = 0; i < cpu_ndevices; i++) { 994 sc = device_get_softc(cpu_devices[i]); 995 acpi_cpu_generic_cx_probe(sc); 996 } 997 } else { 998 /* 999 * We are using _CST mode, remove C3 state if necessary. 1000 * As we now know for sure that we will be using _CST mode 1001 * install our notify handler. 1002 */ 1003 for (i = 0; i < cpu_ndevices; i++) { 1004 sc = device_get_softc(cpu_devices[i]); 1005 if (cpu_quirks & CPU_QUIRK_NO_C3) { 1006 sc->cpu_cx_count = min(sc->cpu_cx_count, sc->cpu_non_c3 + 1); 1007 } 1008 AcpiInstallNotifyHandler(sc->cpu_handle, ACPI_DEVICE_NOTIFY, 1009 acpi_cpu_notify, sc); 1010 } 1011 } 1012 1013 /* Perform Cx final initialization. */ 1014 for (i = 0; i < cpu_ndevices; i++) { 1015 sc = device_get_softc(cpu_devices[i]); 1016 acpi_cpu_startup_cx(sc); 1017 } 1018 1019 /* Add a sysctl handler to handle global Cx lowest setting */ 1020 SYSCTL_ADD_PROC(&cpu_sysctl_ctx, SYSCTL_CHILDREN(cpu_sysctl_tree), 1021 OID_AUTO, "cx_lowest", CTLTYPE_STRING | CTLFLAG_RW, 1022 NULL, 0, acpi_cpu_global_cx_lowest_sysctl, "A", 1023 "Global lowest Cx sleep state to use"); 1024 1025 /* Take over idling from cpu_idle_default(). */ 1026 cpu_cx_lowest_lim = 0; 1027 for (i = 0; i < cpu_ndevices; i++) { 1028 sc = device_get_softc(cpu_devices[i]); 1029 enable_idle(sc); 1030 } 1031#if defined(__i386__) || defined(__amd64__) 1032 cpu_idle_hook = acpi_cpu_idle; 1033#endif 1034} 1035 1036static void 1037acpi_cpu_cx_list(struct acpi_cpu_softc *sc) 1038{ 1039 struct sbuf sb; 1040 int i; 1041 1042 /* 1043 * Set up the list of Cx states 1044 */ 1045 sbuf_new(&sb, sc->cpu_cx_supported, sizeof(sc->cpu_cx_supported), 1046 SBUF_FIXEDLEN); 1047 for (i = 0; i < sc->cpu_cx_count; i++) 1048 sbuf_printf(&sb, "C%d/%d/%d ", i + 1, sc->cpu_cx_states[i].type, 1049 sc->cpu_cx_states[i].trans_lat); 1050 sbuf_trim(&sb); 1051 sbuf_finish(&sb); 1052} 1053 1054static void 1055acpi_cpu_startup_cx(struct acpi_cpu_softc *sc) 1056{ 1057 acpi_cpu_cx_list(sc); 1058 1059 SYSCTL_ADD_STRING(&sc->cpu_sysctl_ctx, 1060 SYSCTL_CHILDREN(device_get_sysctl_tree(sc->cpu_dev)), 1061 OID_AUTO, "cx_supported", CTLFLAG_RD, 1062 sc->cpu_cx_supported, 0, 1063 "Cx/microsecond values for supported Cx states"); 1064 SYSCTL_ADD_PROC(&sc->cpu_sysctl_ctx, 1065 SYSCTL_CHILDREN(device_get_sysctl_tree(sc->cpu_dev)), 1066 OID_AUTO, "cx_lowest", CTLTYPE_STRING | CTLFLAG_RW, 1067 (void *)sc, 0, acpi_cpu_cx_lowest_sysctl, "A", 1068 "lowest Cx sleep state to use"); 1069 SYSCTL_ADD_PROC(&sc->cpu_sysctl_ctx, 1070 SYSCTL_CHILDREN(device_get_sysctl_tree(sc->cpu_dev)), 1071 OID_AUTO, "cx_usage", CTLTYPE_STRING | CTLFLAG_RD, 1072 (void *)sc, 0, acpi_cpu_usage_sysctl, "A", 1073 "percent usage for each Cx state"); 1074 SYSCTL_ADD_PROC(&sc->cpu_sysctl_ctx, 1075 SYSCTL_CHILDREN(device_get_sysctl_tree(sc->cpu_dev)), 1076 OID_AUTO, "cx_usage_counters", CTLTYPE_STRING | CTLFLAG_RD, 1077 (void *)sc, 0, acpi_cpu_usage_counters_sysctl, "A", 1078 "Cx sleep state counters"); 1079#if defined(__i386__) || defined(__amd64__) 1080 SYSCTL_ADD_PROC(&sc->cpu_sysctl_ctx, 1081 SYSCTL_CHILDREN(device_get_sysctl_tree(sc->cpu_dev)), 1082 OID_AUTO, "cx_method", CTLTYPE_STRING | CTLFLAG_RD, 1083 (void *)sc, 0, acpi_cpu_method_sysctl, "A", 1084 "Cx entrance methods"); 1085#endif 1086 1087 /* Signal platform that we can handle _CST notification. */ 1088 if (!cpu_cx_generic && cpu_cst_cnt != 0) { 1089 ACPI_LOCK(acpi); 1090 AcpiOsWritePort(cpu_smi_cmd, cpu_cst_cnt, 8); 1091 ACPI_UNLOCK(acpi); 1092 } 1093} 1094 1095#if defined(__i386__) || defined(__amd64__) 1096/* 1097 * Idle the CPU in the lowest state possible. This function is called with 1098 * interrupts disabled. Note that once it re-enables interrupts, a task 1099 * switch can occur so do not access shared data (i.e. the softc) after 1100 * interrupts are re-enabled. 1101 */ 1102static void 1103acpi_cpu_idle(sbintime_t sbt) 1104{ 1105 struct acpi_cpu_softc *sc; 1106 struct acpi_cx *cx_next; 1107 uint64_t cputicks; 1108 uint32_t start_time, end_time; 1109 ACPI_STATUS status; 1110 int bm_active, cx_next_idx, i, us; 1111 1112 /* 1113 * Look up our CPU id to get our softc. If it's NULL, we'll use C1 1114 * since there is no ACPI processor object for this CPU. This occurs 1115 * for logical CPUs in the HTT case. 1116 */ 1117 sc = cpu_softc[PCPU_GET(cpuid)]; 1118 if (sc == NULL) { 1119 acpi_cpu_c1(); 1120 return; 1121 } 1122 1123 /* If disabled, take the safe path. */ 1124 if (is_idle_disabled(sc)) { 1125 acpi_cpu_c1(); 1126 return; 1127 } 1128 1129 /* Find the lowest state that has small enough latency. */ 1130 us = sc->cpu_prev_sleep; 1131 if (sbt >= 0 && us > (sbt >> 12)) 1132 us = (sbt >> 12); 1133 cx_next_idx = 0; 1134 if (cpu_disable_c2_sleep) 1135 i = min(sc->cpu_cx_lowest, sc->cpu_non_c2); 1136 else if (cpu_disable_c3_sleep) 1137 i = min(sc->cpu_cx_lowest, sc->cpu_non_c3); 1138 else 1139 i = sc->cpu_cx_lowest; 1140 for (; i >= 0; i--) { 1141 if (sc->cpu_cx_states[i].trans_lat * 3 <= us) { 1142 cx_next_idx = i; 1143 break; 1144 } 1145 } 1146 1147 /* 1148 * Check for bus master activity. If there was activity, clear 1149 * the bit and use the lowest non-C3 state. Note that the USB 1150 * driver polling for new devices keeps this bit set all the 1151 * time if USB is loaded. 1152 */ 1153 if ((cpu_quirks & CPU_QUIRK_NO_BM_CTRL) == 0 && 1154 cx_next_idx > sc->cpu_non_c3) { 1155 status = AcpiReadBitRegister(ACPI_BITREG_BUS_MASTER_STATUS, &bm_active); 1156 if (ACPI_SUCCESS(status) && bm_active != 0) { 1157 AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_STATUS, 1); 1158 cx_next_idx = sc->cpu_non_c3; 1159 } 1160 } 1161 1162 /* Select the next state and update statistics. */ 1163 cx_next = &sc->cpu_cx_states[cx_next_idx]; 1164 sc->cpu_cx_stats[cx_next_idx]++; 1165 KASSERT(cx_next->type != ACPI_STATE_C0, ("acpi_cpu_idle: C0 sleep")); 1166 1167 /* 1168 * Execute HLT (or equivalent) and wait for an interrupt. We can't 1169 * precisely calculate the time spent in C1 since the place we wake up 1170 * is an ISR. Assume we slept no more then half of quantum, unless 1171 * we are called inside critical section, delaying context switch. 1172 */ 1173 if (cx_next->type == ACPI_STATE_C1) { 1174 cputicks = cpu_ticks(); 1175 if (cx_next->p_lvlx != NULL) { 1176 /* C1 I/O then Halt */ 1177 CPU_GET_REG(cx_next->p_lvlx, 1); 1178 } 1179 if (cx_next->do_mwait) 1180 acpi_cpu_idle_mwait(cx_next->mwait_hint); 1181 else 1182 acpi_cpu_c1(); 1183 end_time = ((cpu_ticks() - cputicks) << 20) / cpu_tickrate(); 1184 if (curthread->td_critnest == 0) 1185 end_time = min(end_time, 500000 / hz); 1186 /* acpi_cpu_c1() returns with interrupts enabled. */ 1187 if (cx_next->do_mwait) 1188 ACPI_ENABLE_IRQS(); 1189 sc->cpu_prev_sleep = (sc->cpu_prev_sleep * 3 + end_time) / 4; 1190 return; 1191 } 1192 1193 /* 1194 * For C3, disable bus master arbitration and enable bus master wake 1195 * if BM control is available, otherwise flush the CPU cache. 1196 */ 1197 if (cx_next->type == ACPI_STATE_C3 || cx_next->mwait_bm_avoidance) { 1198 if ((cpu_quirks & CPU_QUIRK_NO_BM_CTRL) == 0) { 1199 AcpiWriteBitRegister(ACPI_BITREG_ARB_DISABLE, 1); 1200 AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_RLD, 1); 1201 } else 1202 ACPI_FLUSH_CPU_CACHE(); 1203 } 1204 1205 /* 1206 * Read from P_LVLx to enter C2(+), checking time spent asleep. 1207 * Use the ACPI timer for measuring sleep time. Since we need to 1208 * get the time very close to the CPU start/stop clock logic, this 1209 * is the only reliable time source. 1210 */ 1211 if (cx_next->type == ACPI_STATE_C3) { 1212 AcpiGetTimer(&start_time); 1213 cputicks = 0; 1214 } else { 1215 start_time = 0; 1216 cputicks = cpu_ticks(); 1217 } 1218 if (cx_next->do_mwait) 1219 acpi_cpu_idle_mwait(cx_next->mwait_hint); 1220 else 1221 CPU_GET_REG(cx_next->p_lvlx, 1); 1222 1223 /* 1224 * Read the end time twice. Since it may take an arbitrary time 1225 * to enter the idle state, the first read may be executed before 1226 * the processor has stopped. Doing it again provides enough 1227 * margin that we are certain to have a correct value. 1228 */ 1229 AcpiGetTimer(&end_time); 1230 if (cx_next->type == ACPI_STATE_C3) { 1231 AcpiGetTimer(&end_time); 1232 AcpiGetTimerDuration(start_time, end_time, &end_time); 1233 } else 1234 end_time = ((cpu_ticks() - cputicks) << 20) / cpu_tickrate(); 1235 1236 /* Enable bus master arbitration and disable bus master wakeup. */ 1237 if ((cx_next->type == ACPI_STATE_C3 || cx_next->mwait_bm_avoidance) && 1238 (cpu_quirks & CPU_QUIRK_NO_BM_CTRL) == 0) { 1239 AcpiWriteBitRegister(ACPI_BITREG_ARB_DISABLE, 0); 1240 AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_RLD, 0); 1241 } 1242 ACPI_ENABLE_IRQS(); 1243 1244 sc->cpu_prev_sleep = (sc->cpu_prev_sleep * 3 + PM_USEC(end_time)) / 4; 1245} 1246#endif 1247 1248/* 1249 * Re-evaluate the _CST object when we are notified that it changed. 1250 */ 1251static void 1252acpi_cpu_notify(ACPI_HANDLE h, UINT32 notify, void *context) 1253{ 1254 struct acpi_cpu_softc *sc = (struct acpi_cpu_softc *)context; 1255 1256 if (notify != ACPI_NOTIFY_CX_STATES) 1257 return; 1258 1259 /* 1260 * C-state data for target CPU is going to be in flux while we execute 1261 * acpi_cpu_cx_cst, so disable entering acpi_cpu_idle. 1262 * Also, it may happen that multiple ACPI taskqueues may concurrently 1263 * execute notifications for the same CPU. ACPI_SERIAL is used to 1264 * protect against that. 1265 */ 1266 ACPI_SERIAL_BEGIN(cpu); 1267 disable_idle(sc); 1268 1269 /* Update the list of Cx states. */ 1270 acpi_cpu_cx_cst(sc); 1271 acpi_cpu_cx_list(sc); 1272 acpi_cpu_set_cx_lowest(sc); 1273 1274 enable_idle(sc); 1275 ACPI_SERIAL_END(cpu); 1276 1277 acpi_UserNotify("PROCESSOR", sc->cpu_handle, notify); 1278} 1279 1280static void 1281acpi_cpu_quirks(void) 1282{ 1283 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 1284 1285 /* 1286 * Bus mastering arbitration control is needed to keep caches coherent 1287 * while sleeping in C3. If it's not present but a working flush cache 1288 * instruction is present, flush the caches before entering C3 instead. 1289 * Otherwise, just disable C3 completely. 1290 */ 1291 if (AcpiGbl_FADT.Pm2ControlBlock == 0 || 1292 AcpiGbl_FADT.Pm2ControlLength == 0) { 1293 if ((AcpiGbl_FADT.Flags & ACPI_FADT_WBINVD) && 1294 (AcpiGbl_FADT.Flags & ACPI_FADT_WBINVD_FLUSH) == 0) { 1295 cpu_quirks |= CPU_QUIRK_NO_BM_CTRL; 1296 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1297 "acpi_cpu: no BM control, using flush cache method\n")); 1298 } else { 1299 cpu_quirks |= CPU_QUIRK_NO_C3; 1300 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1301 "acpi_cpu: no BM control, C3 not available\n")); 1302 } 1303 } 1304 1305 /* 1306 * If we are using generic Cx mode, C3 on multiple CPUs requires using 1307 * the expensive flush cache instruction. 1308 */ 1309 if (cpu_cx_generic && mp_ncpus > 1) { 1310 cpu_quirks |= CPU_QUIRK_NO_BM_CTRL; 1311 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1312 "acpi_cpu: SMP, using flush cache mode for C3\n")); 1313 } 1314 1315 /* Look for various quirks of the PIIX4 part. */ 1316 acpi_cpu_quirks_piix4(); 1317} 1318 1319static void 1320acpi_cpu_quirks_piix4(void) 1321{ 1322#ifdef __i386__ 1323 device_t acpi_dev; 1324 uint32_t val; 1325 ACPI_STATUS status; 1326 1327 acpi_dev = pci_find_device(PCI_VENDOR_INTEL, PCI_DEVICE_82371AB_3); 1328 if (acpi_dev != NULL) { 1329 switch (pci_get_revid(acpi_dev)) { 1330 /* 1331 * Disable C3 support for all PIIX4 chipsets. Some of these parts 1332 * do not report the BMIDE status to the BM status register and 1333 * others have a livelock bug if Type-F DMA is enabled. Linux 1334 * works around the BMIDE bug by reading the BM status directly 1335 * but we take the simpler approach of disabling C3 for these 1336 * parts. 1337 * 1338 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA 1339 * Livelock") from the January 2002 PIIX4 specification update. 1340 * Applies to all PIIX4 models. 1341 * 1342 * Also, make sure that all interrupts cause a "Stop Break" 1343 * event to exit from C2 state. 1344 * Also, BRLD_EN_BM (ACPI_BITREG_BUS_MASTER_RLD in ACPI-speak) 1345 * should be set to zero, otherwise it causes C2 to short-sleep. 1346 * PIIX4 doesn't properly support C3 and bus master activity 1347 * need not break out of C2. 1348 */ 1349 case PCI_REVISION_A_STEP: 1350 case PCI_REVISION_B_STEP: 1351 case PCI_REVISION_4E: 1352 case PCI_REVISION_4M: 1353 cpu_quirks |= CPU_QUIRK_NO_C3; 1354 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1355 "acpi_cpu: working around PIIX4 bug, disabling C3\n")); 1356 1357 val = pci_read_config(acpi_dev, PIIX4_DEVACTB_REG, 4); 1358 if ((val & PIIX4_STOP_BREAK_MASK) != PIIX4_STOP_BREAK_MASK) { 1359 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1360 "acpi_cpu: PIIX4: enabling IRQs to generate Stop Break\n")); 1361 val |= PIIX4_STOP_BREAK_MASK; 1362 pci_write_config(acpi_dev, PIIX4_DEVACTB_REG, val, 4); 1363 } 1364 status = AcpiReadBitRegister(ACPI_BITREG_BUS_MASTER_RLD, &val); 1365 if (ACPI_SUCCESS(status) && val != 0) { 1366 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1367 "acpi_cpu: PIIX4: reset BRLD_EN_BM\n")); 1368 AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_RLD, 0); 1369 } 1370 break; 1371 default: 1372 break; 1373 } 1374 } 1375#endif 1376} 1377 1378static int 1379acpi_cpu_usage_sysctl(SYSCTL_HANDLER_ARGS) 1380{ 1381 struct acpi_cpu_softc *sc; 1382 struct sbuf sb; 1383 char buf[128]; 1384 int i; 1385 uintmax_t fract, sum, whole; 1386 1387 sc = (struct acpi_cpu_softc *) arg1; 1388 sum = 0; 1389 for (i = 0; i < sc->cpu_cx_count; i++) 1390 sum += sc->cpu_cx_stats[i]; 1391 sbuf_new(&sb, buf, sizeof(buf), SBUF_FIXEDLEN); 1392 for (i = 0; i < sc->cpu_cx_count; i++) { 1393 if (sum > 0) { 1394 whole = (uintmax_t)sc->cpu_cx_stats[i] * 100; 1395 fract = (whole % sum) * 100; 1396 sbuf_printf(&sb, "%u.%02u%% ", (u_int)(whole / sum), 1397 (u_int)(fract / sum)); 1398 } else 1399 sbuf_printf(&sb, "0.00%% "); 1400 } 1401 sbuf_printf(&sb, "last %dus", sc->cpu_prev_sleep); 1402 sbuf_trim(&sb); 1403 sbuf_finish(&sb); 1404 sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req); 1405 sbuf_delete(&sb); 1406 1407 return (0); 1408} 1409 1410/* 1411 * XXX TODO: actually add support to count each entry/exit 1412 * from the Cx states. 1413 */ 1414static int 1415acpi_cpu_usage_counters_sysctl(SYSCTL_HANDLER_ARGS) 1416{ 1417 struct acpi_cpu_softc *sc; 1418 struct sbuf sb; 1419 char buf[128]; 1420 int i; 1421 1422 sc = (struct acpi_cpu_softc *) arg1; 1423 1424 /* Print out the raw counters */ 1425 sbuf_new(&sb, buf, sizeof(buf), SBUF_FIXEDLEN); 1426 1427 for (i = 0; i < sc->cpu_cx_count; i++) { 1428 sbuf_printf(&sb, "%u ", sc->cpu_cx_stats[i]); 1429 } 1430 1431 sbuf_trim(&sb); 1432 sbuf_finish(&sb); 1433 sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req); 1434 sbuf_delete(&sb); 1435 1436 return (0); 1437} 1438 1439#if defined(__i386__) || defined(__amd64__) 1440static int 1441acpi_cpu_method_sysctl(SYSCTL_HANDLER_ARGS) 1442{ 1443 struct acpi_cpu_softc *sc; 1444 struct acpi_cx *cx; 1445 struct sbuf sb; 1446 char buf[128]; 1447 int i; 1448 1449 sc = (struct acpi_cpu_softc *)arg1; 1450 sbuf_new(&sb, buf, sizeof(buf), SBUF_FIXEDLEN); 1451 for (i = 0; i < sc->cpu_cx_count; i++) { 1452 cx = &sc->cpu_cx_states[i]; 1453 sbuf_printf(&sb, "C%d/", i + 1); 1454 if (cx->do_mwait) { 1455 sbuf_cat(&sb, "mwait"); 1456 if (cx->mwait_hw_coord) 1457 sbuf_cat(&sb, "/hwc"); 1458 if (cx->mwait_bm_avoidance) 1459 sbuf_cat(&sb, "/bma"); 1460 } else if (cx->type == ACPI_STATE_C1) { 1461 sbuf_cat(&sb, "hlt"); 1462 } else { 1463 sbuf_cat(&sb, "io"); 1464 } 1465 if (cx->type == ACPI_STATE_C1 && cx->p_lvlx != NULL) 1466 sbuf_cat(&sb, "/iohlt"); 1467 sbuf_putc(&sb, ' '); 1468 } 1469 sbuf_trim(&sb); 1470 sbuf_finish(&sb); 1471 sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req); 1472 sbuf_delete(&sb); 1473 return (0); 1474} 1475#endif 1476 1477static int 1478acpi_cpu_set_cx_lowest(struct acpi_cpu_softc *sc) 1479{ 1480 int i; 1481 1482 ACPI_SERIAL_ASSERT(cpu); 1483 sc->cpu_cx_lowest = min(sc->cpu_cx_lowest_lim, sc->cpu_cx_count - 1); 1484 1485 /* If not disabling, cache the new lowest non-C3 state. */ 1486 sc->cpu_non_c3 = 0; 1487 for (i = sc->cpu_cx_lowest; i >= 0; i--) { 1488 if (sc->cpu_cx_states[i].type < ACPI_STATE_C3) { 1489 sc->cpu_non_c3 = i; 1490 break; 1491 } 1492 } 1493 1494 /* Reset the statistics counters. */ 1495 bzero(sc->cpu_cx_stats, sizeof(sc->cpu_cx_stats)); 1496 return (0); 1497} 1498 1499static int 1500acpi_cpu_cx_lowest_sysctl(SYSCTL_HANDLER_ARGS) 1501{ 1502 struct acpi_cpu_softc *sc; 1503 char state[8]; 1504 int val, error; 1505 1506 sc = (struct acpi_cpu_softc *) arg1; 1507 snprintf(state, sizeof(state), "C%d", sc->cpu_cx_lowest_lim + 1); 1508 error = sysctl_handle_string(oidp, state, sizeof(state), req); 1509 if (error != 0 || req->newptr == NULL) 1510 return (error); 1511 if (strlen(state) < 2 || toupper(state[0]) != 'C') 1512 return (EINVAL); 1513 if (strcasecmp(state, "Cmax") == 0) 1514 val = MAX_CX_STATES; 1515 else { 1516 val = (int) strtol(state + 1, NULL, 10); 1517 if (val < 1 || val > MAX_CX_STATES) 1518 return (EINVAL); 1519 } 1520 1521 ACPI_SERIAL_BEGIN(cpu); 1522 sc->cpu_cx_lowest_lim = val - 1; 1523 acpi_cpu_set_cx_lowest(sc); 1524 ACPI_SERIAL_END(cpu); 1525 1526 return (0); 1527} 1528 1529static int 1530acpi_cpu_global_cx_lowest_sysctl(SYSCTL_HANDLER_ARGS) 1531{ 1532 struct acpi_cpu_softc *sc; 1533 char state[8]; 1534 int val, error, i; 1535 1536 snprintf(state, sizeof(state), "C%d", cpu_cx_lowest_lim + 1); 1537 error = sysctl_handle_string(oidp, state, sizeof(state), req); 1538 if (error != 0 || req->newptr == NULL) 1539 return (error); 1540 if (strlen(state) < 2 || toupper(state[0]) != 'C') 1541 return (EINVAL); 1542 if (strcasecmp(state, "Cmax") == 0) 1543 val = MAX_CX_STATES; 1544 else { 1545 val = (int) strtol(state + 1, NULL, 10); 1546 if (val < 1 || val > MAX_CX_STATES) 1547 return (EINVAL); 1548 } 1549 1550 /* Update the new lowest useable Cx state for all CPUs. */ 1551 ACPI_SERIAL_BEGIN(cpu); 1552 cpu_cx_lowest_lim = val - 1; 1553 for (i = 0; i < cpu_ndevices; i++) { 1554 sc = device_get_softc(cpu_devices[i]); 1555 sc->cpu_cx_lowest_lim = cpu_cx_lowest_lim; 1556 acpi_cpu_set_cx_lowest(sc); 1557 } 1558 ACPI_SERIAL_END(cpu); 1559 1560 return (0); 1561} 1562