1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * intel_idle.c - native hardware idle loop for modern Intel processors 4 * 5 * Copyright (c) 2013 - 2020, Intel Corporation. 6 * Len Brown <len.brown@intel.com> 7 * Rafael J. Wysocki <rafael.j.wysocki@intel.com> 8 */ 9 10 /* 11 * intel_idle is a cpuidle driver that loads on specific Intel processors 12 * in lieu of the legacy ACPI processor_idle driver. The intent is to 13 * make Linux more efficient on these processors, as intel_idle knows 14 * more than ACPI, as well as make Linux more immune to ACPI BIOS bugs. 15 */ 16 17 /* 18 * Design Assumptions 19 * 20 * All CPUs have same idle states as boot CPU 21 * 22 * Chipset BM_STS (bus master status) bit is a NOP 23 * for preventing entry into deep C-stats 24 */ 25 26 /* 27 * Known limitations 28 * 29 * ACPI has a .suspend hack to turn off deep c-statees during suspend 30 * to avoid complications with the lapic timer workaround. 31 * Have not seen issues with suspend, but may need same workaround here. 32 * 33 */ 34 35 /* un-comment DEBUG to enable pr_debug() statements */ 36 #define DEBUG 37 38 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 39 40 #include <linux/acpi.h> 41 #include <linux/kernel.h> 42 #include <linux/cpuidle.h> 43 #include <linux/tick.h> 44 #include <trace/events/power.h> 45 #include <linux/sched.h> 46 #include <linux/notifier.h> 47 #include <linux/cpu.h> 48 #include <linux/moduleparam.h> 49 #include <asm/cpu_device_id.h> 50 #include <asm/intel-family.h> 51 #include <asm/mwait.h> 52 #include <asm/msr.h> 53 54 #define INTEL_IDLE_VERSION "0.5.1" 55 56 static struct cpuidle_driver intel_idle_driver = { 57 .name = "intel_idle", 58 .owner = THIS_MODULE, 59 }; 60 /* intel_idle.max_cstate=0 disables driver */ 61 static int max_cstate = CPUIDLE_STATE_MAX - 1; 62 static unsigned int disabled_states_mask; 63 64 static struct cpuidle_device __percpu *intel_idle_cpuidle_devices; 65 66 static unsigned long auto_demotion_disable_flags; 67 static bool disable_promotion_to_c1e; 68 69 static bool lapic_timer_always_reliable; 70 71 struct idle_cpu { 72 struct cpuidle_state *state_table; 73 74 /* 75 * Hardware C-state auto-demotion may not always be optimal. 76 * Indicate which enable bits to clear here. 77 */ 78 unsigned long auto_demotion_disable_flags; 79 bool byt_auto_demotion_disable_flag; 80 bool disable_promotion_to_c1e; 81 bool use_acpi; 82 }; 83 84 static const struct idle_cpu *icpu __initdata; 85 static struct cpuidle_state *cpuidle_state_table __initdata; 86 87 static unsigned int mwait_substates __initdata; 88 89 /* 90 * Enable this state by default even if the ACPI _CST does not list it. 91 */ 92 #define CPUIDLE_FLAG_ALWAYS_ENABLE BIT(15) 93 94 /* 95 * Set this flag for states where the HW flushes the TLB for us 96 * and so we don't need cross-calls to keep it consistent. 97 * If this flag is set, SW flushes the TLB, so even if the 98 * HW doesn't do the flushing, this flag is safe to use. 99 */ 100 #define CPUIDLE_FLAG_TLB_FLUSHED BIT(16) 101 102 /* 103 * MWAIT takes an 8-bit "hint" in EAX "suggesting" 104 * the C-state (top nibble) and sub-state (bottom nibble) 105 * 0x00 means "MWAIT(C1)", 0x10 means "MWAIT(C2)" etc. 106 * 107 * We store the hint at the top of our "flags" for each state. 108 */ 109 #define flg2MWAIT(flags) (((flags) >> 24) & 0xFF) 110 #define MWAIT2flg(eax) ((eax & 0xFF) << 24) 111 112 /** 113 * intel_idle - Ask the processor to enter the given idle state. 114 * @dev: cpuidle device of the target CPU. 115 * @drv: cpuidle driver (assumed to point to intel_idle_driver). 116 * @index: Target idle state index. 117 * 118 * Use the MWAIT instruction to notify the processor that the CPU represented by 119 * @dev is idle and it can try to enter the idle state corresponding to @index. 120 * 121 * If the local APIC timer is not known to be reliable in the target idle state, 122 * enable one-shot tick broadcasting for the target CPU before executing MWAIT. 123 * 124 * Optionally call leave_mm() for the target CPU upfront to avoid wakeups due to 125 * flushing user TLBs. 126 * 127 * Must be called under local_irq_disable(). 128 */ 129 static __cpuidle int intel_idle(struct cpuidle_device *dev, 130 struct cpuidle_driver *drv, int index) 131 { 132 struct cpuidle_state *state = &drv->states[index]; 133 unsigned long eax = flg2MWAIT(state->flags); 134 unsigned long ecx = 1; /* break on interrupt flag */ 135 bool uninitialized_var(tick); 136 int cpu = smp_processor_id(); 137 138 /* 139 * leave_mm() to avoid costly and often unnecessary wakeups 140 * for flushing the user TLB's associated with the active mm. 141 */ 142 if (state->flags & CPUIDLE_FLAG_TLB_FLUSHED) 143 leave_mm(cpu); 144 145 if (!static_cpu_has(X86_FEATURE_ARAT) && !lapic_timer_always_reliable) { 146 /* 147 * Switch over to one-shot tick broadcast if the target C-state 148 * is deeper than C1. 149 */ 150 if ((eax >> MWAIT_SUBSTATE_SIZE) & MWAIT_CSTATE_MASK) { 151 tick = true; 152 tick_broadcast_enter(); 153 } else { 154 tick = false; 155 } 156 } 157 158 mwait_idle_with_hints(eax, ecx); 159 160 if (!static_cpu_has(X86_FEATURE_ARAT) && tick) 161 tick_broadcast_exit(); 162 163 return index; 164 } 165 166 /** 167 * intel_idle_s2idle - Ask the processor to enter the given idle state. 168 * @dev: cpuidle device of the target CPU. 169 * @drv: cpuidle driver (assumed to point to intel_idle_driver). 170 * @index: Target idle state index. 171 * 172 * Use the MWAIT instruction to notify the processor that the CPU represented by 173 * @dev is idle and it can try to enter the idle state corresponding to @index. 174 * 175 * Invoked as a suspend-to-idle callback routine with frozen user space, frozen 176 * scheduler tick and suspended scheduler clock on the target CPU. 177 */ 178 static __cpuidle void intel_idle_s2idle(struct cpuidle_device *dev, 179 struct cpuidle_driver *drv, int index) 180 { 181 unsigned long eax = flg2MWAIT(drv->states[index].flags); 182 unsigned long ecx = 1; /* break on interrupt flag */ 183 184 mwait_idle_with_hints(eax, ecx); 185 } 186 187 /* 188 * States are indexed by the cstate number, 189 * which is also the index into the MWAIT hint array. 190 * Thus C0 is a dummy. 191 */ 192 static struct cpuidle_state nehalem_cstates[] __initdata = { 193 { 194 .name = "C1", 195 .desc = "MWAIT 0x00", 196 .flags = MWAIT2flg(0x00), 197 .exit_latency = 3, 198 .target_residency = 6, 199 .enter = &intel_idle, 200 .enter_s2idle = intel_idle_s2idle, }, 201 { 202 .name = "C1E", 203 .desc = "MWAIT 0x01", 204 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 205 .exit_latency = 10, 206 .target_residency = 20, 207 .enter = &intel_idle, 208 .enter_s2idle = intel_idle_s2idle, }, 209 { 210 .name = "C3", 211 .desc = "MWAIT 0x10", 212 .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, 213 .exit_latency = 20, 214 .target_residency = 80, 215 .enter = &intel_idle, 216 .enter_s2idle = intel_idle_s2idle, }, 217 { 218 .name = "C6", 219 .desc = "MWAIT 0x20", 220 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 221 .exit_latency = 200, 222 .target_residency = 800, 223 .enter = &intel_idle, 224 .enter_s2idle = intel_idle_s2idle, }, 225 { 226 .enter = NULL } 227 }; 228 229 static struct cpuidle_state snb_cstates[] __initdata = { 230 { 231 .name = "C1", 232 .desc = "MWAIT 0x00", 233 .flags = MWAIT2flg(0x00), 234 .exit_latency = 2, 235 .target_residency = 2, 236 .enter = &intel_idle, 237 .enter_s2idle = intel_idle_s2idle, }, 238 { 239 .name = "C1E", 240 .desc = "MWAIT 0x01", 241 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 242 .exit_latency = 10, 243 .target_residency = 20, 244 .enter = &intel_idle, 245 .enter_s2idle = intel_idle_s2idle, }, 246 { 247 .name = "C3", 248 .desc = "MWAIT 0x10", 249 .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, 250 .exit_latency = 80, 251 .target_residency = 211, 252 .enter = &intel_idle, 253 .enter_s2idle = intel_idle_s2idle, }, 254 { 255 .name = "C6", 256 .desc = "MWAIT 0x20", 257 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 258 .exit_latency = 104, 259 .target_residency = 345, 260 .enter = &intel_idle, 261 .enter_s2idle = intel_idle_s2idle, }, 262 { 263 .name = "C7", 264 .desc = "MWAIT 0x30", 265 .flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED, 266 .exit_latency = 109, 267 .target_residency = 345, 268 .enter = &intel_idle, 269 .enter_s2idle = intel_idle_s2idle, }, 270 { 271 .enter = NULL } 272 }; 273 274 static struct cpuidle_state byt_cstates[] __initdata = { 275 { 276 .name = "C1", 277 .desc = "MWAIT 0x00", 278 .flags = MWAIT2flg(0x00), 279 .exit_latency = 1, 280 .target_residency = 1, 281 .enter = &intel_idle, 282 .enter_s2idle = intel_idle_s2idle, }, 283 { 284 .name = "C6N", 285 .desc = "MWAIT 0x58", 286 .flags = MWAIT2flg(0x58) | CPUIDLE_FLAG_TLB_FLUSHED, 287 .exit_latency = 300, 288 .target_residency = 275, 289 .enter = &intel_idle, 290 .enter_s2idle = intel_idle_s2idle, }, 291 { 292 .name = "C6S", 293 .desc = "MWAIT 0x52", 294 .flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED, 295 .exit_latency = 500, 296 .target_residency = 560, 297 .enter = &intel_idle, 298 .enter_s2idle = intel_idle_s2idle, }, 299 { 300 .name = "C7", 301 .desc = "MWAIT 0x60", 302 .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, 303 .exit_latency = 1200, 304 .target_residency = 4000, 305 .enter = &intel_idle, 306 .enter_s2idle = intel_idle_s2idle, }, 307 { 308 .name = "C7S", 309 .desc = "MWAIT 0x64", 310 .flags = MWAIT2flg(0x64) | CPUIDLE_FLAG_TLB_FLUSHED, 311 .exit_latency = 10000, 312 .target_residency = 20000, 313 .enter = &intel_idle, 314 .enter_s2idle = intel_idle_s2idle, }, 315 { 316 .enter = NULL } 317 }; 318 319 static struct cpuidle_state cht_cstates[] __initdata = { 320 { 321 .name = "C1", 322 .desc = "MWAIT 0x00", 323 .flags = MWAIT2flg(0x00), 324 .exit_latency = 1, 325 .target_residency = 1, 326 .enter = &intel_idle, 327 .enter_s2idle = intel_idle_s2idle, }, 328 { 329 .name = "C6N", 330 .desc = "MWAIT 0x58", 331 .flags = MWAIT2flg(0x58) | CPUIDLE_FLAG_TLB_FLUSHED, 332 .exit_latency = 80, 333 .target_residency = 275, 334 .enter = &intel_idle, 335 .enter_s2idle = intel_idle_s2idle, }, 336 { 337 .name = "C6S", 338 .desc = "MWAIT 0x52", 339 .flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED, 340 .exit_latency = 200, 341 .target_residency = 560, 342 .enter = &intel_idle, 343 .enter_s2idle = intel_idle_s2idle, }, 344 { 345 .name = "C7", 346 .desc = "MWAIT 0x60", 347 .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, 348 .exit_latency = 1200, 349 .target_residency = 4000, 350 .enter = &intel_idle, 351 .enter_s2idle = intel_idle_s2idle, }, 352 { 353 .name = "C7S", 354 .desc = "MWAIT 0x64", 355 .flags = MWAIT2flg(0x64) | CPUIDLE_FLAG_TLB_FLUSHED, 356 .exit_latency = 10000, 357 .target_residency = 20000, 358 .enter = &intel_idle, 359 .enter_s2idle = intel_idle_s2idle, }, 360 { 361 .enter = NULL } 362 }; 363 364 static struct cpuidle_state ivb_cstates[] __initdata = { 365 { 366 .name = "C1", 367 .desc = "MWAIT 0x00", 368 .flags = MWAIT2flg(0x00), 369 .exit_latency = 1, 370 .target_residency = 1, 371 .enter = &intel_idle, 372 .enter_s2idle = intel_idle_s2idle, }, 373 { 374 .name = "C1E", 375 .desc = "MWAIT 0x01", 376 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 377 .exit_latency = 10, 378 .target_residency = 20, 379 .enter = &intel_idle, 380 .enter_s2idle = intel_idle_s2idle, }, 381 { 382 .name = "C3", 383 .desc = "MWAIT 0x10", 384 .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, 385 .exit_latency = 59, 386 .target_residency = 156, 387 .enter = &intel_idle, 388 .enter_s2idle = intel_idle_s2idle, }, 389 { 390 .name = "C6", 391 .desc = "MWAIT 0x20", 392 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 393 .exit_latency = 80, 394 .target_residency = 300, 395 .enter = &intel_idle, 396 .enter_s2idle = intel_idle_s2idle, }, 397 { 398 .name = "C7", 399 .desc = "MWAIT 0x30", 400 .flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED, 401 .exit_latency = 87, 402 .target_residency = 300, 403 .enter = &intel_idle, 404 .enter_s2idle = intel_idle_s2idle, }, 405 { 406 .enter = NULL } 407 }; 408 409 static struct cpuidle_state ivt_cstates[] __initdata = { 410 { 411 .name = "C1", 412 .desc = "MWAIT 0x00", 413 .flags = MWAIT2flg(0x00), 414 .exit_latency = 1, 415 .target_residency = 1, 416 .enter = &intel_idle, 417 .enter_s2idle = intel_idle_s2idle, }, 418 { 419 .name = "C1E", 420 .desc = "MWAIT 0x01", 421 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 422 .exit_latency = 10, 423 .target_residency = 80, 424 .enter = &intel_idle, 425 .enter_s2idle = intel_idle_s2idle, }, 426 { 427 .name = "C3", 428 .desc = "MWAIT 0x10", 429 .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, 430 .exit_latency = 59, 431 .target_residency = 156, 432 .enter = &intel_idle, 433 .enter_s2idle = intel_idle_s2idle, }, 434 { 435 .name = "C6", 436 .desc = "MWAIT 0x20", 437 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 438 .exit_latency = 82, 439 .target_residency = 300, 440 .enter = &intel_idle, 441 .enter_s2idle = intel_idle_s2idle, }, 442 { 443 .enter = NULL } 444 }; 445 446 static struct cpuidle_state ivt_cstates_4s[] __initdata = { 447 { 448 .name = "C1", 449 .desc = "MWAIT 0x00", 450 .flags = MWAIT2flg(0x00), 451 .exit_latency = 1, 452 .target_residency = 1, 453 .enter = &intel_idle, 454 .enter_s2idle = intel_idle_s2idle, }, 455 { 456 .name = "C1E", 457 .desc = "MWAIT 0x01", 458 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 459 .exit_latency = 10, 460 .target_residency = 250, 461 .enter = &intel_idle, 462 .enter_s2idle = intel_idle_s2idle, }, 463 { 464 .name = "C3", 465 .desc = "MWAIT 0x10", 466 .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, 467 .exit_latency = 59, 468 .target_residency = 300, 469 .enter = &intel_idle, 470 .enter_s2idle = intel_idle_s2idle, }, 471 { 472 .name = "C6", 473 .desc = "MWAIT 0x20", 474 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 475 .exit_latency = 84, 476 .target_residency = 400, 477 .enter = &intel_idle, 478 .enter_s2idle = intel_idle_s2idle, }, 479 { 480 .enter = NULL } 481 }; 482 483 static struct cpuidle_state ivt_cstates_8s[] __initdata = { 484 { 485 .name = "C1", 486 .desc = "MWAIT 0x00", 487 .flags = MWAIT2flg(0x00), 488 .exit_latency = 1, 489 .target_residency = 1, 490 .enter = &intel_idle, 491 .enter_s2idle = intel_idle_s2idle, }, 492 { 493 .name = "C1E", 494 .desc = "MWAIT 0x01", 495 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 496 .exit_latency = 10, 497 .target_residency = 500, 498 .enter = &intel_idle, 499 .enter_s2idle = intel_idle_s2idle, }, 500 { 501 .name = "C3", 502 .desc = "MWAIT 0x10", 503 .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, 504 .exit_latency = 59, 505 .target_residency = 600, 506 .enter = &intel_idle, 507 .enter_s2idle = intel_idle_s2idle, }, 508 { 509 .name = "C6", 510 .desc = "MWAIT 0x20", 511 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 512 .exit_latency = 88, 513 .target_residency = 700, 514 .enter = &intel_idle, 515 .enter_s2idle = intel_idle_s2idle, }, 516 { 517 .enter = NULL } 518 }; 519 520 static struct cpuidle_state hsw_cstates[] __initdata = { 521 { 522 .name = "C1", 523 .desc = "MWAIT 0x00", 524 .flags = MWAIT2flg(0x00), 525 .exit_latency = 2, 526 .target_residency = 2, 527 .enter = &intel_idle, 528 .enter_s2idle = intel_idle_s2idle, }, 529 { 530 .name = "C1E", 531 .desc = "MWAIT 0x01", 532 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 533 .exit_latency = 10, 534 .target_residency = 20, 535 .enter = &intel_idle, 536 .enter_s2idle = intel_idle_s2idle, }, 537 { 538 .name = "C3", 539 .desc = "MWAIT 0x10", 540 .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, 541 .exit_latency = 33, 542 .target_residency = 100, 543 .enter = &intel_idle, 544 .enter_s2idle = intel_idle_s2idle, }, 545 { 546 .name = "C6", 547 .desc = "MWAIT 0x20", 548 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 549 .exit_latency = 133, 550 .target_residency = 400, 551 .enter = &intel_idle, 552 .enter_s2idle = intel_idle_s2idle, }, 553 { 554 .name = "C7s", 555 .desc = "MWAIT 0x32", 556 .flags = MWAIT2flg(0x32) | CPUIDLE_FLAG_TLB_FLUSHED, 557 .exit_latency = 166, 558 .target_residency = 500, 559 .enter = &intel_idle, 560 .enter_s2idle = intel_idle_s2idle, }, 561 { 562 .name = "C8", 563 .desc = "MWAIT 0x40", 564 .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED, 565 .exit_latency = 300, 566 .target_residency = 900, 567 .enter = &intel_idle, 568 .enter_s2idle = intel_idle_s2idle, }, 569 { 570 .name = "C9", 571 .desc = "MWAIT 0x50", 572 .flags = MWAIT2flg(0x50) | CPUIDLE_FLAG_TLB_FLUSHED, 573 .exit_latency = 600, 574 .target_residency = 1800, 575 .enter = &intel_idle, 576 .enter_s2idle = intel_idle_s2idle, }, 577 { 578 .name = "C10", 579 .desc = "MWAIT 0x60", 580 .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, 581 .exit_latency = 2600, 582 .target_residency = 7700, 583 .enter = &intel_idle, 584 .enter_s2idle = intel_idle_s2idle, }, 585 { 586 .enter = NULL } 587 }; 588 static struct cpuidle_state bdw_cstates[] __initdata = { 589 { 590 .name = "C1", 591 .desc = "MWAIT 0x00", 592 .flags = MWAIT2flg(0x00), 593 .exit_latency = 2, 594 .target_residency = 2, 595 .enter = &intel_idle, 596 .enter_s2idle = intel_idle_s2idle, }, 597 { 598 .name = "C1E", 599 .desc = "MWAIT 0x01", 600 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 601 .exit_latency = 10, 602 .target_residency = 20, 603 .enter = &intel_idle, 604 .enter_s2idle = intel_idle_s2idle, }, 605 { 606 .name = "C3", 607 .desc = "MWAIT 0x10", 608 .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, 609 .exit_latency = 40, 610 .target_residency = 100, 611 .enter = &intel_idle, 612 .enter_s2idle = intel_idle_s2idle, }, 613 { 614 .name = "C6", 615 .desc = "MWAIT 0x20", 616 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 617 .exit_latency = 133, 618 .target_residency = 400, 619 .enter = &intel_idle, 620 .enter_s2idle = intel_idle_s2idle, }, 621 { 622 .name = "C7s", 623 .desc = "MWAIT 0x32", 624 .flags = MWAIT2flg(0x32) | CPUIDLE_FLAG_TLB_FLUSHED, 625 .exit_latency = 166, 626 .target_residency = 500, 627 .enter = &intel_idle, 628 .enter_s2idle = intel_idle_s2idle, }, 629 { 630 .name = "C8", 631 .desc = "MWAIT 0x40", 632 .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED, 633 .exit_latency = 300, 634 .target_residency = 900, 635 .enter = &intel_idle, 636 .enter_s2idle = intel_idle_s2idle, }, 637 { 638 .name = "C9", 639 .desc = "MWAIT 0x50", 640 .flags = MWAIT2flg(0x50) | CPUIDLE_FLAG_TLB_FLUSHED, 641 .exit_latency = 600, 642 .target_residency = 1800, 643 .enter = &intel_idle, 644 .enter_s2idle = intel_idle_s2idle, }, 645 { 646 .name = "C10", 647 .desc = "MWAIT 0x60", 648 .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, 649 .exit_latency = 2600, 650 .target_residency = 7700, 651 .enter = &intel_idle, 652 .enter_s2idle = intel_idle_s2idle, }, 653 { 654 .enter = NULL } 655 }; 656 657 static struct cpuidle_state skl_cstates[] __initdata = { 658 { 659 .name = "C1", 660 .desc = "MWAIT 0x00", 661 .flags = MWAIT2flg(0x00), 662 .exit_latency = 2, 663 .target_residency = 2, 664 .enter = &intel_idle, 665 .enter_s2idle = intel_idle_s2idle, }, 666 { 667 .name = "C1E", 668 .desc = "MWAIT 0x01", 669 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 670 .exit_latency = 10, 671 .target_residency = 20, 672 .enter = &intel_idle, 673 .enter_s2idle = intel_idle_s2idle, }, 674 { 675 .name = "C3", 676 .desc = "MWAIT 0x10", 677 .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, 678 .exit_latency = 70, 679 .target_residency = 100, 680 .enter = &intel_idle, 681 .enter_s2idle = intel_idle_s2idle, }, 682 { 683 .name = "C6", 684 .desc = "MWAIT 0x20", 685 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 686 .exit_latency = 85, 687 .target_residency = 200, 688 .enter = &intel_idle, 689 .enter_s2idle = intel_idle_s2idle, }, 690 { 691 .name = "C7s", 692 .desc = "MWAIT 0x33", 693 .flags = MWAIT2flg(0x33) | CPUIDLE_FLAG_TLB_FLUSHED, 694 .exit_latency = 124, 695 .target_residency = 800, 696 .enter = &intel_idle, 697 .enter_s2idle = intel_idle_s2idle, }, 698 { 699 .name = "C8", 700 .desc = "MWAIT 0x40", 701 .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED, 702 .exit_latency = 200, 703 .target_residency = 800, 704 .enter = &intel_idle, 705 .enter_s2idle = intel_idle_s2idle, }, 706 { 707 .name = "C9", 708 .desc = "MWAIT 0x50", 709 .flags = MWAIT2flg(0x50) | CPUIDLE_FLAG_TLB_FLUSHED, 710 .exit_latency = 480, 711 .target_residency = 5000, 712 .enter = &intel_idle, 713 .enter_s2idle = intel_idle_s2idle, }, 714 { 715 .name = "C10", 716 .desc = "MWAIT 0x60", 717 .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, 718 .exit_latency = 890, 719 .target_residency = 5000, 720 .enter = &intel_idle, 721 .enter_s2idle = intel_idle_s2idle, }, 722 { 723 .enter = NULL } 724 }; 725 726 static struct cpuidle_state skx_cstates[] __initdata = { 727 { 728 .name = "C1", 729 .desc = "MWAIT 0x00", 730 .flags = MWAIT2flg(0x00), 731 .exit_latency = 2, 732 .target_residency = 2, 733 .enter = &intel_idle, 734 .enter_s2idle = intel_idle_s2idle, }, 735 { 736 .name = "C1E", 737 .desc = "MWAIT 0x01", 738 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 739 .exit_latency = 10, 740 .target_residency = 20, 741 .enter = &intel_idle, 742 .enter_s2idle = intel_idle_s2idle, }, 743 { 744 .name = "C6", 745 .desc = "MWAIT 0x20", 746 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 747 .exit_latency = 133, 748 .target_residency = 600, 749 .enter = &intel_idle, 750 .enter_s2idle = intel_idle_s2idle, }, 751 { 752 .enter = NULL } 753 }; 754 755 static struct cpuidle_state atom_cstates[] __initdata = { 756 { 757 .name = "C1E", 758 .desc = "MWAIT 0x00", 759 .flags = MWAIT2flg(0x00), 760 .exit_latency = 10, 761 .target_residency = 20, 762 .enter = &intel_idle, 763 .enter_s2idle = intel_idle_s2idle, }, 764 { 765 .name = "C2", 766 .desc = "MWAIT 0x10", 767 .flags = MWAIT2flg(0x10), 768 .exit_latency = 20, 769 .target_residency = 80, 770 .enter = &intel_idle, 771 .enter_s2idle = intel_idle_s2idle, }, 772 { 773 .name = "C4", 774 .desc = "MWAIT 0x30", 775 .flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED, 776 .exit_latency = 100, 777 .target_residency = 400, 778 .enter = &intel_idle, 779 .enter_s2idle = intel_idle_s2idle, }, 780 { 781 .name = "C6", 782 .desc = "MWAIT 0x52", 783 .flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED, 784 .exit_latency = 140, 785 .target_residency = 560, 786 .enter = &intel_idle, 787 .enter_s2idle = intel_idle_s2idle, }, 788 { 789 .enter = NULL } 790 }; 791 static struct cpuidle_state tangier_cstates[] __initdata = { 792 { 793 .name = "C1", 794 .desc = "MWAIT 0x00", 795 .flags = MWAIT2flg(0x00), 796 .exit_latency = 1, 797 .target_residency = 4, 798 .enter = &intel_idle, 799 .enter_s2idle = intel_idle_s2idle, }, 800 { 801 .name = "C4", 802 .desc = "MWAIT 0x30", 803 .flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED, 804 .exit_latency = 100, 805 .target_residency = 400, 806 .enter = &intel_idle, 807 .enter_s2idle = intel_idle_s2idle, }, 808 { 809 .name = "C6", 810 .desc = "MWAIT 0x52", 811 .flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED, 812 .exit_latency = 140, 813 .target_residency = 560, 814 .enter = &intel_idle, 815 .enter_s2idle = intel_idle_s2idle, }, 816 { 817 .name = "C7", 818 .desc = "MWAIT 0x60", 819 .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, 820 .exit_latency = 1200, 821 .target_residency = 4000, 822 .enter = &intel_idle, 823 .enter_s2idle = intel_idle_s2idle, }, 824 { 825 .name = "C9", 826 .desc = "MWAIT 0x64", 827 .flags = MWAIT2flg(0x64) | CPUIDLE_FLAG_TLB_FLUSHED, 828 .exit_latency = 10000, 829 .target_residency = 20000, 830 .enter = &intel_idle, 831 .enter_s2idle = intel_idle_s2idle, }, 832 { 833 .enter = NULL } 834 }; 835 static struct cpuidle_state avn_cstates[] __initdata = { 836 { 837 .name = "C1", 838 .desc = "MWAIT 0x00", 839 .flags = MWAIT2flg(0x00), 840 .exit_latency = 2, 841 .target_residency = 2, 842 .enter = &intel_idle, 843 .enter_s2idle = intel_idle_s2idle, }, 844 { 845 .name = "C6", 846 .desc = "MWAIT 0x51", 847 .flags = MWAIT2flg(0x51) | CPUIDLE_FLAG_TLB_FLUSHED, 848 .exit_latency = 15, 849 .target_residency = 45, 850 .enter = &intel_idle, 851 .enter_s2idle = intel_idle_s2idle, }, 852 { 853 .enter = NULL } 854 }; 855 static struct cpuidle_state knl_cstates[] __initdata = { 856 { 857 .name = "C1", 858 .desc = "MWAIT 0x00", 859 .flags = MWAIT2flg(0x00), 860 .exit_latency = 1, 861 .target_residency = 2, 862 .enter = &intel_idle, 863 .enter_s2idle = intel_idle_s2idle }, 864 { 865 .name = "C6", 866 .desc = "MWAIT 0x10", 867 .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, 868 .exit_latency = 120, 869 .target_residency = 500, 870 .enter = &intel_idle, 871 .enter_s2idle = intel_idle_s2idle }, 872 { 873 .enter = NULL } 874 }; 875 876 static struct cpuidle_state bxt_cstates[] __initdata = { 877 { 878 .name = "C1", 879 .desc = "MWAIT 0x00", 880 .flags = MWAIT2flg(0x00), 881 .exit_latency = 2, 882 .target_residency = 2, 883 .enter = &intel_idle, 884 .enter_s2idle = intel_idle_s2idle, }, 885 { 886 .name = "C1E", 887 .desc = "MWAIT 0x01", 888 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 889 .exit_latency = 10, 890 .target_residency = 20, 891 .enter = &intel_idle, 892 .enter_s2idle = intel_idle_s2idle, }, 893 { 894 .name = "C6", 895 .desc = "MWAIT 0x20", 896 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 897 .exit_latency = 133, 898 .target_residency = 133, 899 .enter = &intel_idle, 900 .enter_s2idle = intel_idle_s2idle, }, 901 { 902 .name = "C7s", 903 .desc = "MWAIT 0x31", 904 .flags = MWAIT2flg(0x31) | CPUIDLE_FLAG_TLB_FLUSHED, 905 .exit_latency = 155, 906 .target_residency = 155, 907 .enter = &intel_idle, 908 .enter_s2idle = intel_idle_s2idle, }, 909 { 910 .name = "C8", 911 .desc = "MWAIT 0x40", 912 .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED, 913 .exit_latency = 1000, 914 .target_residency = 1000, 915 .enter = &intel_idle, 916 .enter_s2idle = intel_idle_s2idle, }, 917 { 918 .name = "C9", 919 .desc = "MWAIT 0x50", 920 .flags = MWAIT2flg(0x50) | CPUIDLE_FLAG_TLB_FLUSHED, 921 .exit_latency = 2000, 922 .target_residency = 2000, 923 .enter = &intel_idle, 924 .enter_s2idle = intel_idle_s2idle, }, 925 { 926 .name = "C10", 927 .desc = "MWAIT 0x60", 928 .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, 929 .exit_latency = 10000, 930 .target_residency = 10000, 931 .enter = &intel_idle, 932 .enter_s2idle = intel_idle_s2idle, }, 933 { 934 .enter = NULL } 935 }; 936 937 static struct cpuidle_state dnv_cstates[] __initdata = { 938 { 939 .name = "C1", 940 .desc = "MWAIT 0x00", 941 .flags = MWAIT2flg(0x00), 942 .exit_latency = 2, 943 .target_residency = 2, 944 .enter = &intel_idle, 945 .enter_s2idle = intel_idle_s2idle, }, 946 { 947 .name = "C1E", 948 .desc = "MWAIT 0x01", 949 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 950 .exit_latency = 10, 951 .target_residency = 20, 952 .enter = &intel_idle, 953 .enter_s2idle = intel_idle_s2idle, }, 954 { 955 .name = "C6", 956 .desc = "MWAIT 0x20", 957 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 958 .exit_latency = 50, 959 .target_residency = 500, 960 .enter = &intel_idle, 961 .enter_s2idle = intel_idle_s2idle, }, 962 { 963 .enter = NULL } 964 }; 965 966 static const struct idle_cpu idle_cpu_nehalem __initconst = { 967 .state_table = nehalem_cstates, 968 .auto_demotion_disable_flags = NHM_C1_AUTO_DEMOTE | NHM_C3_AUTO_DEMOTE, 969 .disable_promotion_to_c1e = true, 970 }; 971 972 static const struct idle_cpu idle_cpu_nhx __initconst = { 973 .state_table = nehalem_cstates, 974 .auto_demotion_disable_flags = NHM_C1_AUTO_DEMOTE | NHM_C3_AUTO_DEMOTE, 975 .disable_promotion_to_c1e = true, 976 .use_acpi = true, 977 }; 978 979 static const struct idle_cpu idle_cpu_atom __initconst = { 980 .state_table = atom_cstates, 981 }; 982 983 static const struct idle_cpu idle_cpu_tangier __initconst = { 984 .state_table = tangier_cstates, 985 }; 986 987 static const struct idle_cpu idle_cpu_lincroft __initconst = { 988 .state_table = atom_cstates, 989 .auto_demotion_disable_flags = ATM_LNC_C6_AUTO_DEMOTE, 990 }; 991 992 static const struct idle_cpu idle_cpu_snb __initconst = { 993 .state_table = snb_cstates, 994 .disable_promotion_to_c1e = true, 995 }; 996 997 static const struct idle_cpu idle_cpu_snx __initconst = { 998 .state_table = snb_cstates, 999 .disable_promotion_to_c1e = true, 1000 .use_acpi = true, 1001 }; 1002 1003 static const struct idle_cpu idle_cpu_byt __initconst = { 1004 .state_table = byt_cstates, 1005 .disable_promotion_to_c1e = true, 1006 .byt_auto_demotion_disable_flag = true, 1007 }; 1008 1009 static const struct idle_cpu idle_cpu_cht __initconst = { 1010 .state_table = cht_cstates, 1011 .disable_promotion_to_c1e = true, 1012 .byt_auto_demotion_disable_flag = true, 1013 }; 1014 1015 static const struct idle_cpu idle_cpu_ivb __initconst = { 1016 .state_table = ivb_cstates, 1017 .disable_promotion_to_c1e = true, 1018 }; 1019 1020 static const struct idle_cpu idle_cpu_ivt __initconst = { 1021 .state_table = ivt_cstates, 1022 .disable_promotion_to_c1e = true, 1023 .use_acpi = true, 1024 }; 1025 1026 static const struct idle_cpu idle_cpu_hsw __initconst = { 1027 .state_table = hsw_cstates, 1028 .disable_promotion_to_c1e = true, 1029 }; 1030 1031 static const struct idle_cpu idle_cpu_hsx __initconst = { 1032 .state_table = hsw_cstates, 1033 .disable_promotion_to_c1e = true, 1034 .use_acpi = true, 1035 }; 1036 1037 static const struct idle_cpu idle_cpu_bdw __initconst = { 1038 .state_table = bdw_cstates, 1039 .disable_promotion_to_c1e = true, 1040 }; 1041 1042 static const struct idle_cpu idle_cpu_bdx __initconst = { 1043 .state_table = bdw_cstates, 1044 .disable_promotion_to_c1e = true, 1045 .use_acpi = true, 1046 }; 1047 1048 static const struct idle_cpu idle_cpu_skl __initconst = { 1049 .state_table = skl_cstates, 1050 .disable_promotion_to_c1e = true, 1051 }; 1052 1053 static const struct idle_cpu idle_cpu_skx __initconst = { 1054 .state_table = skx_cstates, 1055 .disable_promotion_to_c1e = true, 1056 .use_acpi = true, 1057 }; 1058 1059 static const struct idle_cpu idle_cpu_avn __initconst = { 1060 .state_table = avn_cstates, 1061 .disable_promotion_to_c1e = true, 1062 .use_acpi = true, 1063 }; 1064 1065 static const struct idle_cpu idle_cpu_knl __initconst = { 1066 .state_table = knl_cstates, 1067 .use_acpi = true, 1068 }; 1069 1070 static const struct idle_cpu idle_cpu_bxt __initconst = { 1071 .state_table = bxt_cstates, 1072 .disable_promotion_to_c1e = true, 1073 }; 1074 1075 static const struct idle_cpu idle_cpu_dnv __initconst = { 1076 .state_table = dnv_cstates, 1077 .disable_promotion_to_c1e = true, 1078 .use_acpi = true, 1079 }; 1080 1081 static const struct x86_cpu_id intel_idle_ids[] __initconst = { 1082 X86_MATCH_INTEL_FAM6_MODEL(NEHALEM_EP, &idle_cpu_nhx), 1083 X86_MATCH_INTEL_FAM6_MODEL(NEHALEM, &idle_cpu_nehalem), 1084 X86_MATCH_INTEL_FAM6_MODEL(NEHALEM_G, &idle_cpu_nehalem), 1085 X86_MATCH_INTEL_FAM6_MODEL(WESTMERE, &idle_cpu_nehalem), 1086 X86_MATCH_INTEL_FAM6_MODEL(WESTMERE_EP, &idle_cpu_nhx), 1087 X86_MATCH_INTEL_FAM6_MODEL(NEHALEM_EX, &idle_cpu_nhx), 1088 X86_MATCH_INTEL_FAM6_MODEL(ATOM_BONNELL, &idle_cpu_atom), 1089 X86_MATCH_INTEL_FAM6_MODEL(ATOM_BONNELL_MID, &idle_cpu_lincroft), 1090 X86_MATCH_INTEL_FAM6_MODEL(WESTMERE_EX, &idle_cpu_nhx), 1091 X86_MATCH_INTEL_FAM6_MODEL(SANDYBRIDGE, &idle_cpu_snb), 1092 X86_MATCH_INTEL_FAM6_MODEL(SANDYBRIDGE_X, &idle_cpu_snx), 1093 X86_MATCH_INTEL_FAM6_MODEL(ATOM_SALTWELL, &idle_cpu_atom), 1094 X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT, &idle_cpu_byt), 1095 X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_MID, &idle_cpu_tangier), 1096 X86_MATCH_INTEL_FAM6_MODEL(ATOM_AIRMONT, &idle_cpu_cht), 1097 X86_MATCH_INTEL_FAM6_MODEL(IVYBRIDGE, &idle_cpu_ivb), 1098 X86_MATCH_INTEL_FAM6_MODEL(IVYBRIDGE_X, &idle_cpu_ivt), 1099 X86_MATCH_INTEL_FAM6_MODEL(HASWELL, &idle_cpu_hsw), 1100 X86_MATCH_INTEL_FAM6_MODEL(HASWELL_X, &idle_cpu_hsx), 1101 X86_MATCH_INTEL_FAM6_MODEL(HASWELL_L, &idle_cpu_hsw), 1102 X86_MATCH_INTEL_FAM6_MODEL(HASWELL_G, &idle_cpu_hsw), 1103 X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_D, &idle_cpu_avn), 1104 X86_MATCH_INTEL_FAM6_MODEL(BROADWELL, &idle_cpu_bdw), 1105 X86_MATCH_INTEL_FAM6_MODEL(BROADWELL_G, &idle_cpu_bdw), 1106 X86_MATCH_INTEL_FAM6_MODEL(BROADWELL_X, &idle_cpu_bdx), 1107 X86_MATCH_INTEL_FAM6_MODEL(BROADWELL_D, &idle_cpu_bdx), 1108 X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_L, &idle_cpu_skl), 1109 X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE, &idle_cpu_skl), 1110 X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE_L, &idle_cpu_skl), 1111 X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE, &idle_cpu_skl), 1112 X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_X, &idle_cpu_skx), 1113 X86_MATCH_INTEL_FAM6_MODEL(XEON_PHI_KNL, &idle_cpu_knl), 1114 X86_MATCH_INTEL_FAM6_MODEL(XEON_PHI_KNM, &idle_cpu_knl), 1115 X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT, &idle_cpu_bxt), 1116 X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT_PLUS, &idle_cpu_bxt), 1117 X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT_D, &idle_cpu_dnv), 1118 X86_MATCH_INTEL_FAM6_MODEL(ATOM_TREMONT_D, &idle_cpu_dnv), 1119 {} 1120 }; 1121 1122 static const struct x86_cpu_id intel_mwait_ids[] __initconst = { 1123 X86_MATCH_VENDOR_FAM_FEATURE(INTEL, 6, X86_FEATURE_MWAIT, NULL), 1124 {} 1125 }; 1126 1127 static bool __init intel_idle_max_cstate_reached(int cstate) 1128 { 1129 if (cstate + 1 > max_cstate) { 1130 pr_info("max_cstate %d reached\n", max_cstate); 1131 return true; 1132 } 1133 return false; 1134 } 1135 1136 #ifdef CONFIG_ACPI_PROCESSOR_CSTATE 1137 #include <acpi/processor.h> 1138 1139 static bool no_acpi __read_mostly; 1140 module_param(no_acpi, bool, 0444); 1141 MODULE_PARM_DESC(no_acpi, "Do not use ACPI _CST for building the idle states list"); 1142 1143 static bool force_use_acpi __read_mostly; /* No effect if no_acpi is set. */ 1144 module_param_named(use_acpi, force_use_acpi, bool, 0444); 1145 MODULE_PARM_DESC(use_acpi, "Use ACPI _CST for building the idle states list"); 1146 1147 static struct acpi_processor_power acpi_state_table __initdata; 1148 1149 /** 1150 * intel_idle_cst_usable - Check if the _CST information can be used. 1151 * 1152 * Check if all of the C-states listed by _CST in the max_cstate range are 1153 * ACPI_CSTATE_FFH, which means that they should be entered via MWAIT. 1154 */ 1155 static bool __init intel_idle_cst_usable(void) 1156 { 1157 int cstate, limit; 1158 1159 limit = min_t(int, min_t(int, CPUIDLE_STATE_MAX, max_cstate + 1), 1160 acpi_state_table.count); 1161 1162 for (cstate = 1; cstate < limit; cstate++) { 1163 struct acpi_processor_cx *cx = &acpi_state_table.states[cstate]; 1164 1165 if (cx->entry_method != ACPI_CSTATE_FFH) 1166 return false; 1167 } 1168 1169 return true; 1170 } 1171 1172 static bool __init intel_idle_acpi_cst_extract(void) 1173 { 1174 unsigned int cpu; 1175 1176 if (no_acpi) { 1177 pr_debug("Not allowed to use ACPI _CST\n"); 1178 return false; 1179 } 1180 1181 for_each_possible_cpu(cpu) { 1182 struct acpi_processor *pr = per_cpu(processors, cpu); 1183 1184 if (!pr) 1185 continue; 1186 1187 if (acpi_processor_evaluate_cst(pr->handle, cpu, &acpi_state_table)) 1188 continue; 1189 1190 acpi_state_table.count++; 1191 1192 if (!intel_idle_cst_usable()) 1193 continue; 1194 1195 if (!acpi_processor_claim_cst_control()) { 1196 acpi_state_table.count = 0; 1197 return false; 1198 } 1199 1200 return true; 1201 } 1202 1203 pr_debug("ACPI _CST not found or not usable\n"); 1204 return false; 1205 } 1206 1207 static void __init intel_idle_init_cstates_acpi(struct cpuidle_driver *drv) 1208 { 1209 int cstate, limit = min_t(int, CPUIDLE_STATE_MAX, acpi_state_table.count); 1210 1211 /* 1212 * If limit > 0, intel_idle_cst_usable() has returned 'true', so all of 1213 * the interesting states are ACPI_CSTATE_FFH. 1214 */ 1215 for (cstate = 1; cstate < limit; cstate++) { 1216 struct acpi_processor_cx *cx; 1217 struct cpuidle_state *state; 1218 1219 if (intel_idle_max_cstate_reached(cstate)) 1220 break; 1221 1222 cx = &acpi_state_table.states[cstate]; 1223 1224 state = &drv->states[drv->state_count++]; 1225 1226 snprintf(state->name, CPUIDLE_NAME_LEN, "C%d_ACPI", cstate); 1227 strlcpy(state->desc, cx->desc, CPUIDLE_DESC_LEN); 1228 state->exit_latency = cx->latency; 1229 /* 1230 * For C1-type C-states use the same number for both the exit 1231 * latency and target residency, because that is the case for 1232 * C1 in the majority of the static C-states tables above. 1233 * For the other types of C-states, however, set the target 1234 * residency to 3 times the exit latency which should lead to 1235 * a reasonable balance between energy-efficiency and 1236 * performance in the majority of interesting cases. 1237 */ 1238 state->target_residency = cx->latency; 1239 if (cx->type > ACPI_STATE_C1) 1240 state->target_residency *= 3; 1241 1242 state->flags = MWAIT2flg(cx->address); 1243 if (cx->type > ACPI_STATE_C2) 1244 state->flags |= CPUIDLE_FLAG_TLB_FLUSHED; 1245 1246 if (disabled_states_mask & BIT(cstate)) 1247 state->flags |= CPUIDLE_FLAG_OFF; 1248 1249 state->enter = intel_idle; 1250 state->enter_s2idle = intel_idle_s2idle; 1251 } 1252 } 1253 1254 static bool __init intel_idle_off_by_default(u32 mwait_hint) 1255 { 1256 int cstate, limit; 1257 1258 /* 1259 * If there are no _CST C-states, do not disable any C-states by 1260 * default. 1261 */ 1262 if (!acpi_state_table.count) 1263 return false; 1264 1265 limit = min_t(int, CPUIDLE_STATE_MAX, acpi_state_table.count); 1266 /* 1267 * If limit > 0, intel_idle_cst_usable() has returned 'true', so all of 1268 * the interesting states are ACPI_CSTATE_FFH. 1269 */ 1270 for (cstate = 1; cstate < limit; cstate++) { 1271 if (acpi_state_table.states[cstate].address == mwait_hint) 1272 return false; 1273 } 1274 return true; 1275 } 1276 #else /* !CONFIG_ACPI_PROCESSOR_CSTATE */ 1277 #define force_use_acpi (false) 1278 1279 static inline bool intel_idle_acpi_cst_extract(void) { return false; } 1280 static inline void intel_idle_init_cstates_acpi(struct cpuidle_driver *drv) { } 1281 static inline bool intel_idle_off_by_default(u32 mwait_hint) { return false; } 1282 #endif /* !CONFIG_ACPI_PROCESSOR_CSTATE */ 1283 1284 /** 1285 * ivt_idle_state_table_update - Tune the idle states table for Ivy Town. 1286 * 1287 * Tune IVT multi-socket targets. 1288 * Assumption: num_sockets == (max_package_num + 1). 1289 */ 1290 static void __init ivt_idle_state_table_update(void) 1291 { 1292 /* IVT uses a different table for 1-2, 3-4, and > 4 sockets */ 1293 int cpu, package_num, num_sockets = 1; 1294 1295 for_each_online_cpu(cpu) { 1296 package_num = topology_physical_package_id(cpu); 1297 if (package_num + 1 > num_sockets) { 1298 num_sockets = package_num + 1; 1299 1300 if (num_sockets > 4) { 1301 cpuidle_state_table = ivt_cstates_8s; 1302 return; 1303 } 1304 } 1305 } 1306 1307 if (num_sockets > 2) 1308 cpuidle_state_table = ivt_cstates_4s; 1309 1310 /* else, 1 and 2 socket systems use default ivt_cstates */ 1311 } 1312 1313 /** 1314 * irtl_2_usec - IRTL to microseconds conversion. 1315 * @irtl: IRTL MSR value. 1316 * 1317 * Translate the IRTL (Interrupt Response Time Limit) MSR value to microseconds. 1318 */ 1319 static unsigned long long __init irtl_2_usec(unsigned long long irtl) 1320 { 1321 static const unsigned int irtl_ns_units[] __initconst = { 1322 1, 32, 1024, 32768, 1048576, 33554432, 0, 0 1323 }; 1324 unsigned long long ns; 1325 1326 if (!irtl) 1327 return 0; 1328 1329 ns = irtl_ns_units[(irtl >> 10) & 0x7]; 1330 1331 return div_u64((irtl & 0x3FF) * ns, NSEC_PER_USEC); 1332 } 1333 1334 /** 1335 * bxt_idle_state_table_update - Fix up the Broxton idle states table. 1336 * 1337 * On BXT, trust the IRTL (Interrupt Response Time Limit) MSR to show the 1338 * definitive maximum latency and use the same value for target_residency. 1339 */ 1340 static void __init bxt_idle_state_table_update(void) 1341 { 1342 unsigned long long msr; 1343 unsigned int usec; 1344 1345 rdmsrl(MSR_PKGC6_IRTL, msr); 1346 usec = irtl_2_usec(msr); 1347 if (usec) { 1348 bxt_cstates[2].exit_latency = usec; 1349 bxt_cstates[2].target_residency = usec; 1350 } 1351 1352 rdmsrl(MSR_PKGC7_IRTL, msr); 1353 usec = irtl_2_usec(msr); 1354 if (usec) { 1355 bxt_cstates[3].exit_latency = usec; 1356 bxt_cstates[3].target_residency = usec; 1357 } 1358 1359 rdmsrl(MSR_PKGC8_IRTL, msr); 1360 usec = irtl_2_usec(msr); 1361 if (usec) { 1362 bxt_cstates[4].exit_latency = usec; 1363 bxt_cstates[4].target_residency = usec; 1364 } 1365 1366 rdmsrl(MSR_PKGC9_IRTL, msr); 1367 usec = irtl_2_usec(msr); 1368 if (usec) { 1369 bxt_cstates[5].exit_latency = usec; 1370 bxt_cstates[5].target_residency = usec; 1371 } 1372 1373 rdmsrl(MSR_PKGC10_IRTL, msr); 1374 usec = irtl_2_usec(msr); 1375 if (usec) { 1376 bxt_cstates[6].exit_latency = usec; 1377 bxt_cstates[6].target_residency = usec; 1378 } 1379 1380 } 1381 1382 /** 1383 * sklh_idle_state_table_update - Fix up the Sky Lake idle states table. 1384 * 1385 * On SKL-H (model 0x5e) skip C8 and C9 if C10 is enabled and SGX disabled. 1386 */ 1387 static void __init sklh_idle_state_table_update(void) 1388 { 1389 unsigned long long msr; 1390 unsigned int eax, ebx, ecx, edx; 1391 1392 1393 /* if PC10 disabled via cmdline intel_idle.max_cstate=7 or shallower */ 1394 if (max_cstate <= 7) 1395 return; 1396 1397 /* if PC10 not present in CPUID.MWAIT.EDX */ 1398 if ((mwait_substates & (0xF << 28)) == 0) 1399 return; 1400 1401 rdmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr); 1402 1403 /* PC10 is not enabled in PKG C-state limit */ 1404 if ((msr & 0xF) != 8) 1405 return; 1406 1407 ecx = 0; 1408 cpuid(7, &eax, &ebx, &ecx, &edx); 1409 1410 /* if SGX is present */ 1411 if (ebx & (1 << 2)) { 1412 1413 rdmsrl(MSR_IA32_FEAT_CTL, msr); 1414 1415 /* if SGX is enabled */ 1416 if (msr & (1 << 18)) 1417 return; 1418 } 1419 1420 skl_cstates[5].flags |= CPUIDLE_FLAG_UNUSABLE; /* C8-SKL */ 1421 skl_cstates[6].flags |= CPUIDLE_FLAG_UNUSABLE; /* C9-SKL */ 1422 } 1423 1424 static bool __init intel_idle_verify_cstate(unsigned int mwait_hint) 1425 { 1426 unsigned int mwait_cstate = MWAIT_HINT2CSTATE(mwait_hint) + 1; 1427 unsigned int num_substates = (mwait_substates >> mwait_cstate * 4) & 1428 MWAIT_SUBSTATE_MASK; 1429 1430 /* Ignore the C-state if there are NO sub-states in CPUID for it. */ 1431 if (num_substates == 0) 1432 return false; 1433 1434 if (mwait_cstate > 2 && !boot_cpu_has(X86_FEATURE_NONSTOP_TSC)) 1435 mark_tsc_unstable("TSC halts in idle states deeper than C2"); 1436 1437 return true; 1438 } 1439 1440 static void __init intel_idle_init_cstates_icpu(struct cpuidle_driver *drv) 1441 { 1442 int cstate; 1443 1444 switch (boot_cpu_data.x86_model) { 1445 case INTEL_FAM6_IVYBRIDGE_X: 1446 ivt_idle_state_table_update(); 1447 break; 1448 case INTEL_FAM6_ATOM_GOLDMONT: 1449 case INTEL_FAM6_ATOM_GOLDMONT_PLUS: 1450 bxt_idle_state_table_update(); 1451 break; 1452 case INTEL_FAM6_SKYLAKE: 1453 sklh_idle_state_table_update(); 1454 break; 1455 } 1456 1457 for (cstate = 0; cstate < CPUIDLE_STATE_MAX; ++cstate) { 1458 unsigned int mwait_hint; 1459 1460 if (intel_idle_max_cstate_reached(cstate)) 1461 break; 1462 1463 if (!cpuidle_state_table[cstate].enter && 1464 !cpuidle_state_table[cstate].enter_s2idle) 1465 break; 1466 1467 /* If marked as unusable, skip this state. */ 1468 if (cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_UNUSABLE) { 1469 pr_debug("state %s is disabled\n", 1470 cpuidle_state_table[cstate].name); 1471 continue; 1472 } 1473 1474 mwait_hint = flg2MWAIT(cpuidle_state_table[cstate].flags); 1475 if (!intel_idle_verify_cstate(mwait_hint)) 1476 continue; 1477 1478 /* Structure copy. */ 1479 drv->states[drv->state_count] = cpuidle_state_table[cstate]; 1480 1481 if ((disabled_states_mask & BIT(drv->state_count)) || 1482 ((icpu->use_acpi || force_use_acpi) && 1483 intel_idle_off_by_default(mwait_hint) && 1484 !(cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_ALWAYS_ENABLE))) 1485 drv->states[drv->state_count].flags |= CPUIDLE_FLAG_OFF; 1486 1487 drv->state_count++; 1488 } 1489 1490 if (icpu->byt_auto_demotion_disable_flag) { 1491 wrmsrl(MSR_CC6_DEMOTION_POLICY_CONFIG, 0); 1492 wrmsrl(MSR_MC6_DEMOTION_POLICY_CONFIG, 0); 1493 } 1494 } 1495 1496 /** 1497 * intel_idle_cpuidle_driver_init - Create the list of available idle states. 1498 * @drv: cpuidle driver structure to initialize. 1499 */ 1500 static void __init intel_idle_cpuidle_driver_init(struct cpuidle_driver *drv) 1501 { 1502 cpuidle_poll_state_init(drv); 1503 1504 if (disabled_states_mask & BIT(0)) 1505 drv->states[0].flags |= CPUIDLE_FLAG_OFF; 1506 1507 drv->state_count = 1; 1508 1509 if (icpu) 1510 intel_idle_init_cstates_icpu(drv); 1511 else 1512 intel_idle_init_cstates_acpi(drv); 1513 } 1514 1515 static void auto_demotion_disable(void) 1516 { 1517 unsigned long long msr_bits; 1518 1519 rdmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr_bits); 1520 msr_bits &= ~auto_demotion_disable_flags; 1521 wrmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr_bits); 1522 } 1523 1524 static void c1e_promotion_disable(void) 1525 { 1526 unsigned long long msr_bits; 1527 1528 rdmsrl(MSR_IA32_POWER_CTL, msr_bits); 1529 msr_bits &= ~0x2; 1530 wrmsrl(MSR_IA32_POWER_CTL, msr_bits); 1531 } 1532 1533 /** 1534 * intel_idle_cpu_init - Register the target CPU with the cpuidle core. 1535 * @cpu: CPU to initialize. 1536 * 1537 * Register a cpuidle device object for @cpu and update its MSRs in accordance 1538 * with the processor model flags. 1539 */ 1540 static int intel_idle_cpu_init(unsigned int cpu) 1541 { 1542 struct cpuidle_device *dev; 1543 1544 dev = per_cpu_ptr(intel_idle_cpuidle_devices, cpu); 1545 dev->cpu = cpu; 1546 1547 if (cpuidle_register_device(dev)) { 1548 pr_debug("cpuidle_register_device %d failed!\n", cpu); 1549 return -EIO; 1550 } 1551 1552 if (auto_demotion_disable_flags) 1553 auto_demotion_disable(); 1554 1555 if (disable_promotion_to_c1e) 1556 c1e_promotion_disable(); 1557 1558 return 0; 1559 } 1560 1561 static int intel_idle_cpu_online(unsigned int cpu) 1562 { 1563 struct cpuidle_device *dev; 1564 1565 if (!lapic_timer_always_reliable) 1566 tick_broadcast_enable(); 1567 1568 /* 1569 * Some systems can hotplug a cpu at runtime after 1570 * the kernel has booted, we have to initialize the 1571 * driver in this case 1572 */ 1573 dev = per_cpu_ptr(intel_idle_cpuidle_devices, cpu); 1574 if (!dev->registered) 1575 return intel_idle_cpu_init(cpu); 1576 1577 return 0; 1578 } 1579 1580 /** 1581 * intel_idle_cpuidle_devices_uninit - Unregister all cpuidle devices. 1582 */ 1583 static void __init intel_idle_cpuidle_devices_uninit(void) 1584 { 1585 int i; 1586 1587 for_each_online_cpu(i) 1588 cpuidle_unregister_device(per_cpu_ptr(intel_idle_cpuidle_devices, i)); 1589 } 1590 1591 static int __init intel_idle_init(void) 1592 { 1593 const struct x86_cpu_id *id; 1594 unsigned int eax, ebx, ecx; 1595 int retval; 1596 1597 /* Do not load intel_idle at all for now if idle= is passed */ 1598 if (boot_option_idle_override != IDLE_NO_OVERRIDE) 1599 return -ENODEV; 1600 1601 if (max_cstate == 0) { 1602 pr_debug("disabled\n"); 1603 return -EPERM; 1604 } 1605 1606 id = x86_match_cpu(intel_idle_ids); 1607 if (id) { 1608 if (!boot_cpu_has(X86_FEATURE_MWAIT)) { 1609 pr_debug("Please enable MWAIT in BIOS SETUP\n"); 1610 return -ENODEV; 1611 } 1612 } else { 1613 id = x86_match_cpu(intel_mwait_ids); 1614 if (!id) 1615 return -ENODEV; 1616 } 1617 1618 if (boot_cpu_data.cpuid_level < CPUID_MWAIT_LEAF) 1619 return -ENODEV; 1620 1621 cpuid(CPUID_MWAIT_LEAF, &eax, &ebx, &ecx, &mwait_substates); 1622 1623 if (!(ecx & CPUID5_ECX_EXTENSIONS_SUPPORTED) || 1624 !(ecx & CPUID5_ECX_INTERRUPT_BREAK) || 1625 !mwait_substates) 1626 return -ENODEV; 1627 1628 pr_debug("MWAIT substates: 0x%x\n", mwait_substates); 1629 1630 icpu = (const struct idle_cpu *)id->driver_data; 1631 if (icpu) { 1632 cpuidle_state_table = icpu->state_table; 1633 auto_demotion_disable_flags = icpu->auto_demotion_disable_flags; 1634 disable_promotion_to_c1e = icpu->disable_promotion_to_c1e; 1635 if (icpu->use_acpi || force_use_acpi) 1636 intel_idle_acpi_cst_extract(); 1637 } else if (!intel_idle_acpi_cst_extract()) { 1638 return -ENODEV; 1639 } 1640 1641 pr_debug("v" INTEL_IDLE_VERSION " model 0x%X\n", 1642 boot_cpu_data.x86_model); 1643 1644 intel_idle_cpuidle_devices = alloc_percpu(struct cpuidle_device); 1645 if (!intel_idle_cpuidle_devices) 1646 return -ENOMEM; 1647 1648 intel_idle_cpuidle_driver_init(&intel_idle_driver); 1649 1650 retval = cpuidle_register_driver(&intel_idle_driver); 1651 if (retval) { 1652 struct cpuidle_driver *drv = cpuidle_get_driver(); 1653 printk(KERN_DEBUG pr_fmt("intel_idle yielding to %s\n"), 1654 drv ? drv->name : "none"); 1655 goto init_driver_fail; 1656 } 1657 1658 if (boot_cpu_has(X86_FEATURE_ARAT)) /* Always Reliable APIC Timer */ 1659 lapic_timer_always_reliable = true; 1660 1661 retval = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "idle/intel:online", 1662 intel_idle_cpu_online, NULL); 1663 if (retval < 0) 1664 goto hp_setup_fail; 1665 1666 pr_debug("Local APIC timer is reliable in %s\n", 1667 lapic_timer_always_reliable ? "all C-states" : "C1"); 1668 1669 return 0; 1670 1671 hp_setup_fail: 1672 intel_idle_cpuidle_devices_uninit(); 1673 cpuidle_unregister_driver(&intel_idle_driver); 1674 init_driver_fail: 1675 free_percpu(intel_idle_cpuidle_devices); 1676 return retval; 1677 1678 } 1679 device_initcall(intel_idle_init); 1680 1681 /* 1682 * We are not really modular, but we used to support that. Meaning we also 1683 * support "intel_idle.max_cstate=..." at boot and also a read-only export of 1684 * it at /sys/module/intel_idle/parameters/max_cstate -- so using module_param 1685 * is the easiest way (currently) to continue doing that. 1686 */ 1687 module_param(max_cstate, int, 0444); 1688 /* 1689 * The positions of the bits that are set in this number are the indices of the 1690 * idle states to be disabled by default (as reflected by the names of the 1691 * corresponding idle state directories in sysfs, "state0", "state1" ... 1692 * "state<i>" ..., where <i> is the index of the given state). 1693 */ 1694 module_param_named(states_off, disabled_states_mask, uint, 0444); 1695 MODULE_PARM_DESC(states_off, "Mask of disabled idle states"); 1696