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 all Intel CPUs with MWAIT 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-states 24 * 25 * CPU will flush caches as needed when entering a C-state via MWAIT 26 * (in contrast to entering ACPI C3, in which case the WBINVD 27 * instruction needs to be executed to flush the caches) 28 */ 29 30 /* 31 * Known limitations 32 * 33 * ACPI has a .suspend hack to turn off deep c-statees during suspend 34 * to avoid complications with the lapic timer workaround. 35 * Have not seen issues with suspend, but may need same workaround here. 36 * 37 */ 38 39 /* un-comment DEBUG to enable pr_debug() statements */ 40 #define DEBUG 41 42 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 43 44 #include <linux/acpi.h> 45 #include <linux/kernel.h> 46 #include <linux/cpuidle.h> 47 #include <linux/tick.h> 48 #include <trace/events/power.h> 49 #include <linux/sched.h> 50 #include <linux/notifier.h> 51 #include <linux/cpu.h> 52 #include <linux/moduleparam.h> 53 #include <asm/cpu_device_id.h> 54 #include <asm/intel-family.h> 55 #include <asm/mwait.h> 56 #include <asm/msr.h> 57 58 #define INTEL_IDLE_VERSION "0.5.1" 59 60 static struct cpuidle_driver intel_idle_driver = { 61 .name = "intel_idle", 62 .owner = THIS_MODULE, 63 }; 64 /* intel_idle.max_cstate=0 disables driver */ 65 static int max_cstate = CPUIDLE_STATE_MAX - 1; 66 static unsigned int disabled_states_mask; 67 68 static struct cpuidle_device __percpu *intel_idle_cpuidle_devices; 69 70 static unsigned long auto_demotion_disable_flags; 71 static bool disable_promotion_to_c1e; 72 73 struct idle_cpu { 74 struct cpuidle_state *state_table; 75 76 /* 77 * Hardware C-state auto-demotion may not always be optimal. 78 * Indicate which enable bits to clear here. 79 */ 80 unsigned long auto_demotion_disable_flags; 81 bool byt_auto_demotion_disable_flag; 82 bool disable_promotion_to_c1e; 83 bool use_acpi; 84 }; 85 86 static const struct idle_cpu *icpu __initdata; 87 static struct cpuidle_state *cpuidle_state_table __initdata; 88 89 static unsigned int mwait_substates __initdata; 90 91 /* 92 * Enable this state by default even if the ACPI _CST does not list it. 93 */ 94 #define CPUIDLE_FLAG_ALWAYS_ENABLE BIT(15) 95 96 /* 97 * MWAIT takes an 8-bit "hint" in EAX "suggesting" 98 * the C-state (top nibble) and sub-state (bottom nibble) 99 * 0x00 means "MWAIT(C1)", 0x10 means "MWAIT(C2)" etc. 100 * 101 * We store the hint at the top of our "flags" for each state. 102 */ 103 #define flg2MWAIT(flags) (((flags) >> 24) & 0xFF) 104 #define MWAIT2flg(eax) ((eax & 0xFF) << 24) 105 106 /** 107 * intel_idle - Ask the processor to enter the given idle state. 108 * @dev: cpuidle device of the target CPU. 109 * @drv: cpuidle driver (assumed to point to intel_idle_driver). 110 * @index: Target idle state index. 111 * 112 * Use the MWAIT instruction to notify the processor that the CPU represented by 113 * @dev is idle and it can try to enter the idle state corresponding to @index. 114 * 115 * If the local APIC timer is not known to be reliable in the target idle state, 116 * enable one-shot tick broadcasting for the target CPU before executing MWAIT. 117 * 118 * Optionally call leave_mm() for the target CPU upfront to avoid wakeups due to 119 * flushing user TLBs. 120 * 121 * Must be called under local_irq_disable(). 122 */ 123 static __cpuidle int intel_idle(struct cpuidle_device *dev, 124 struct cpuidle_driver *drv, int index) 125 { 126 struct cpuidle_state *state = &drv->states[index]; 127 unsigned long eax = flg2MWAIT(state->flags); 128 unsigned long ecx = 1; /* break on interrupt flag */ 129 130 mwait_idle_with_hints(eax, ecx); 131 132 return index; 133 } 134 135 /** 136 * intel_idle_s2idle - Ask the processor to enter the given idle state. 137 * @dev: cpuidle device of the target CPU. 138 * @drv: cpuidle driver (assumed to point to intel_idle_driver). 139 * @index: Target idle state index. 140 * 141 * Use the MWAIT instruction to notify the processor that the CPU represented by 142 * @dev is idle and it can try to enter the idle state corresponding to @index. 143 * 144 * Invoked as a suspend-to-idle callback routine with frozen user space, frozen 145 * scheduler tick and suspended scheduler clock on the target CPU. 146 */ 147 static __cpuidle int intel_idle_s2idle(struct cpuidle_device *dev, 148 struct cpuidle_driver *drv, int index) 149 { 150 unsigned long eax = flg2MWAIT(drv->states[index].flags); 151 unsigned long ecx = 1; /* break on interrupt flag */ 152 153 mwait_idle_with_hints(eax, ecx); 154 155 return 0; 156 } 157 158 /* 159 * States are indexed by the cstate number, 160 * which is also the index into the MWAIT hint array. 161 * Thus C0 is a dummy. 162 */ 163 static struct cpuidle_state nehalem_cstates[] __initdata = { 164 { 165 .name = "C1", 166 .desc = "MWAIT 0x00", 167 .flags = MWAIT2flg(0x00), 168 .exit_latency = 3, 169 .target_residency = 6, 170 .enter = &intel_idle, 171 .enter_s2idle = intel_idle_s2idle, }, 172 { 173 .name = "C1E", 174 .desc = "MWAIT 0x01", 175 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 176 .exit_latency = 10, 177 .target_residency = 20, 178 .enter = &intel_idle, 179 .enter_s2idle = intel_idle_s2idle, }, 180 { 181 .name = "C3", 182 .desc = "MWAIT 0x10", 183 .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, 184 .exit_latency = 20, 185 .target_residency = 80, 186 .enter = &intel_idle, 187 .enter_s2idle = intel_idle_s2idle, }, 188 { 189 .name = "C6", 190 .desc = "MWAIT 0x20", 191 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 192 .exit_latency = 200, 193 .target_residency = 800, 194 .enter = &intel_idle, 195 .enter_s2idle = intel_idle_s2idle, }, 196 { 197 .enter = NULL } 198 }; 199 200 static struct cpuidle_state snb_cstates[] __initdata = { 201 { 202 .name = "C1", 203 .desc = "MWAIT 0x00", 204 .flags = MWAIT2flg(0x00), 205 .exit_latency = 2, 206 .target_residency = 2, 207 .enter = &intel_idle, 208 .enter_s2idle = intel_idle_s2idle, }, 209 { 210 .name = "C1E", 211 .desc = "MWAIT 0x01", 212 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 213 .exit_latency = 10, 214 .target_residency = 20, 215 .enter = &intel_idle, 216 .enter_s2idle = intel_idle_s2idle, }, 217 { 218 .name = "C3", 219 .desc = "MWAIT 0x10", 220 .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, 221 .exit_latency = 80, 222 .target_residency = 211, 223 .enter = &intel_idle, 224 .enter_s2idle = intel_idle_s2idle, }, 225 { 226 .name = "C6", 227 .desc = "MWAIT 0x20", 228 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 229 .exit_latency = 104, 230 .target_residency = 345, 231 .enter = &intel_idle, 232 .enter_s2idle = intel_idle_s2idle, }, 233 { 234 .name = "C7", 235 .desc = "MWAIT 0x30", 236 .flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED, 237 .exit_latency = 109, 238 .target_residency = 345, 239 .enter = &intel_idle, 240 .enter_s2idle = intel_idle_s2idle, }, 241 { 242 .enter = NULL } 243 }; 244 245 static struct cpuidle_state byt_cstates[] __initdata = { 246 { 247 .name = "C1", 248 .desc = "MWAIT 0x00", 249 .flags = MWAIT2flg(0x00), 250 .exit_latency = 1, 251 .target_residency = 1, 252 .enter = &intel_idle, 253 .enter_s2idle = intel_idle_s2idle, }, 254 { 255 .name = "C6N", 256 .desc = "MWAIT 0x58", 257 .flags = MWAIT2flg(0x58) | CPUIDLE_FLAG_TLB_FLUSHED, 258 .exit_latency = 300, 259 .target_residency = 275, 260 .enter = &intel_idle, 261 .enter_s2idle = intel_idle_s2idle, }, 262 { 263 .name = "C6S", 264 .desc = "MWAIT 0x52", 265 .flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED, 266 .exit_latency = 500, 267 .target_residency = 560, 268 .enter = &intel_idle, 269 .enter_s2idle = intel_idle_s2idle, }, 270 { 271 .name = "C7", 272 .desc = "MWAIT 0x60", 273 .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, 274 .exit_latency = 1200, 275 .target_residency = 4000, 276 .enter = &intel_idle, 277 .enter_s2idle = intel_idle_s2idle, }, 278 { 279 .name = "C7S", 280 .desc = "MWAIT 0x64", 281 .flags = MWAIT2flg(0x64) | CPUIDLE_FLAG_TLB_FLUSHED, 282 .exit_latency = 10000, 283 .target_residency = 20000, 284 .enter = &intel_idle, 285 .enter_s2idle = intel_idle_s2idle, }, 286 { 287 .enter = NULL } 288 }; 289 290 static struct cpuidle_state cht_cstates[] __initdata = { 291 { 292 .name = "C1", 293 .desc = "MWAIT 0x00", 294 .flags = MWAIT2flg(0x00), 295 .exit_latency = 1, 296 .target_residency = 1, 297 .enter = &intel_idle, 298 .enter_s2idle = intel_idle_s2idle, }, 299 { 300 .name = "C6N", 301 .desc = "MWAIT 0x58", 302 .flags = MWAIT2flg(0x58) | CPUIDLE_FLAG_TLB_FLUSHED, 303 .exit_latency = 80, 304 .target_residency = 275, 305 .enter = &intel_idle, 306 .enter_s2idle = intel_idle_s2idle, }, 307 { 308 .name = "C6S", 309 .desc = "MWAIT 0x52", 310 .flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED, 311 .exit_latency = 200, 312 .target_residency = 560, 313 .enter = &intel_idle, 314 .enter_s2idle = intel_idle_s2idle, }, 315 { 316 .name = "C7", 317 .desc = "MWAIT 0x60", 318 .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, 319 .exit_latency = 1200, 320 .target_residency = 4000, 321 .enter = &intel_idle, 322 .enter_s2idle = intel_idle_s2idle, }, 323 { 324 .name = "C7S", 325 .desc = "MWAIT 0x64", 326 .flags = MWAIT2flg(0x64) | CPUIDLE_FLAG_TLB_FLUSHED, 327 .exit_latency = 10000, 328 .target_residency = 20000, 329 .enter = &intel_idle, 330 .enter_s2idle = intel_idle_s2idle, }, 331 { 332 .enter = NULL } 333 }; 334 335 static struct cpuidle_state ivb_cstates[] __initdata = { 336 { 337 .name = "C1", 338 .desc = "MWAIT 0x00", 339 .flags = MWAIT2flg(0x00), 340 .exit_latency = 1, 341 .target_residency = 1, 342 .enter = &intel_idle, 343 .enter_s2idle = intel_idle_s2idle, }, 344 { 345 .name = "C1E", 346 .desc = "MWAIT 0x01", 347 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 348 .exit_latency = 10, 349 .target_residency = 20, 350 .enter = &intel_idle, 351 .enter_s2idle = intel_idle_s2idle, }, 352 { 353 .name = "C3", 354 .desc = "MWAIT 0x10", 355 .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, 356 .exit_latency = 59, 357 .target_residency = 156, 358 .enter = &intel_idle, 359 .enter_s2idle = intel_idle_s2idle, }, 360 { 361 .name = "C6", 362 .desc = "MWAIT 0x20", 363 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 364 .exit_latency = 80, 365 .target_residency = 300, 366 .enter = &intel_idle, 367 .enter_s2idle = intel_idle_s2idle, }, 368 { 369 .name = "C7", 370 .desc = "MWAIT 0x30", 371 .flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED, 372 .exit_latency = 87, 373 .target_residency = 300, 374 .enter = &intel_idle, 375 .enter_s2idle = intel_idle_s2idle, }, 376 { 377 .enter = NULL } 378 }; 379 380 static struct cpuidle_state ivt_cstates[] __initdata = { 381 { 382 .name = "C1", 383 .desc = "MWAIT 0x00", 384 .flags = MWAIT2flg(0x00), 385 .exit_latency = 1, 386 .target_residency = 1, 387 .enter = &intel_idle, 388 .enter_s2idle = intel_idle_s2idle, }, 389 { 390 .name = "C1E", 391 .desc = "MWAIT 0x01", 392 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 393 .exit_latency = 10, 394 .target_residency = 80, 395 .enter = &intel_idle, 396 .enter_s2idle = intel_idle_s2idle, }, 397 { 398 .name = "C3", 399 .desc = "MWAIT 0x10", 400 .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, 401 .exit_latency = 59, 402 .target_residency = 156, 403 .enter = &intel_idle, 404 .enter_s2idle = intel_idle_s2idle, }, 405 { 406 .name = "C6", 407 .desc = "MWAIT 0x20", 408 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 409 .exit_latency = 82, 410 .target_residency = 300, 411 .enter = &intel_idle, 412 .enter_s2idle = intel_idle_s2idle, }, 413 { 414 .enter = NULL } 415 }; 416 417 static struct cpuidle_state ivt_cstates_4s[] __initdata = { 418 { 419 .name = "C1", 420 .desc = "MWAIT 0x00", 421 .flags = MWAIT2flg(0x00), 422 .exit_latency = 1, 423 .target_residency = 1, 424 .enter = &intel_idle, 425 .enter_s2idle = intel_idle_s2idle, }, 426 { 427 .name = "C1E", 428 .desc = "MWAIT 0x01", 429 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 430 .exit_latency = 10, 431 .target_residency = 250, 432 .enter = &intel_idle, 433 .enter_s2idle = intel_idle_s2idle, }, 434 { 435 .name = "C3", 436 .desc = "MWAIT 0x10", 437 .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, 438 .exit_latency = 59, 439 .target_residency = 300, 440 .enter = &intel_idle, 441 .enter_s2idle = intel_idle_s2idle, }, 442 { 443 .name = "C6", 444 .desc = "MWAIT 0x20", 445 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 446 .exit_latency = 84, 447 .target_residency = 400, 448 .enter = &intel_idle, 449 .enter_s2idle = intel_idle_s2idle, }, 450 { 451 .enter = NULL } 452 }; 453 454 static struct cpuidle_state ivt_cstates_8s[] __initdata = { 455 { 456 .name = "C1", 457 .desc = "MWAIT 0x00", 458 .flags = MWAIT2flg(0x00), 459 .exit_latency = 1, 460 .target_residency = 1, 461 .enter = &intel_idle, 462 .enter_s2idle = intel_idle_s2idle, }, 463 { 464 .name = "C1E", 465 .desc = "MWAIT 0x01", 466 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 467 .exit_latency = 10, 468 .target_residency = 500, 469 .enter = &intel_idle, 470 .enter_s2idle = intel_idle_s2idle, }, 471 { 472 .name = "C3", 473 .desc = "MWAIT 0x10", 474 .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, 475 .exit_latency = 59, 476 .target_residency = 600, 477 .enter = &intel_idle, 478 .enter_s2idle = intel_idle_s2idle, }, 479 { 480 .name = "C6", 481 .desc = "MWAIT 0x20", 482 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 483 .exit_latency = 88, 484 .target_residency = 700, 485 .enter = &intel_idle, 486 .enter_s2idle = intel_idle_s2idle, }, 487 { 488 .enter = NULL } 489 }; 490 491 static struct cpuidle_state hsw_cstates[] __initdata = { 492 { 493 .name = "C1", 494 .desc = "MWAIT 0x00", 495 .flags = MWAIT2flg(0x00), 496 .exit_latency = 2, 497 .target_residency = 2, 498 .enter = &intel_idle, 499 .enter_s2idle = intel_idle_s2idle, }, 500 { 501 .name = "C1E", 502 .desc = "MWAIT 0x01", 503 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 504 .exit_latency = 10, 505 .target_residency = 20, 506 .enter = &intel_idle, 507 .enter_s2idle = intel_idle_s2idle, }, 508 { 509 .name = "C3", 510 .desc = "MWAIT 0x10", 511 .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, 512 .exit_latency = 33, 513 .target_residency = 100, 514 .enter = &intel_idle, 515 .enter_s2idle = intel_idle_s2idle, }, 516 { 517 .name = "C6", 518 .desc = "MWAIT 0x20", 519 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 520 .exit_latency = 133, 521 .target_residency = 400, 522 .enter = &intel_idle, 523 .enter_s2idle = intel_idle_s2idle, }, 524 { 525 .name = "C7s", 526 .desc = "MWAIT 0x32", 527 .flags = MWAIT2flg(0x32) | CPUIDLE_FLAG_TLB_FLUSHED, 528 .exit_latency = 166, 529 .target_residency = 500, 530 .enter = &intel_idle, 531 .enter_s2idle = intel_idle_s2idle, }, 532 { 533 .name = "C8", 534 .desc = "MWAIT 0x40", 535 .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED, 536 .exit_latency = 300, 537 .target_residency = 900, 538 .enter = &intel_idle, 539 .enter_s2idle = intel_idle_s2idle, }, 540 { 541 .name = "C9", 542 .desc = "MWAIT 0x50", 543 .flags = MWAIT2flg(0x50) | CPUIDLE_FLAG_TLB_FLUSHED, 544 .exit_latency = 600, 545 .target_residency = 1800, 546 .enter = &intel_idle, 547 .enter_s2idle = intel_idle_s2idle, }, 548 { 549 .name = "C10", 550 .desc = "MWAIT 0x60", 551 .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, 552 .exit_latency = 2600, 553 .target_residency = 7700, 554 .enter = &intel_idle, 555 .enter_s2idle = intel_idle_s2idle, }, 556 { 557 .enter = NULL } 558 }; 559 static struct cpuidle_state bdw_cstates[] __initdata = { 560 { 561 .name = "C1", 562 .desc = "MWAIT 0x00", 563 .flags = MWAIT2flg(0x00), 564 .exit_latency = 2, 565 .target_residency = 2, 566 .enter = &intel_idle, 567 .enter_s2idle = intel_idle_s2idle, }, 568 { 569 .name = "C1E", 570 .desc = "MWAIT 0x01", 571 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 572 .exit_latency = 10, 573 .target_residency = 20, 574 .enter = &intel_idle, 575 .enter_s2idle = intel_idle_s2idle, }, 576 { 577 .name = "C3", 578 .desc = "MWAIT 0x10", 579 .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, 580 .exit_latency = 40, 581 .target_residency = 100, 582 .enter = &intel_idle, 583 .enter_s2idle = intel_idle_s2idle, }, 584 { 585 .name = "C6", 586 .desc = "MWAIT 0x20", 587 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 588 .exit_latency = 133, 589 .target_residency = 400, 590 .enter = &intel_idle, 591 .enter_s2idle = intel_idle_s2idle, }, 592 { 593 .name = "C7s", 594 .desc = "MWAIT 0x32", 595 .flags = MWAIT2flg(0x32) | CPUIDLE_FLAG_TLB_FLUSHED, 596 .exit_latency = 166, 597 .target_residency = 500, 598 .enter = &intel_idle, 599 .enter_s2idle = intel_idle_s2idle, }, 600 { 601 .name = "C8", 602 .desc = "MWAIT 0x40", 603 .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED, 604 .exit_latency = 300, 605 .target_residency = 900, 606 .enter = &intel_idle, 607 .enter_s2idle = intel_idle_s2idle, }, 608 { 609 .name = "C9", 610 .desc = "MWAIT 0x50", 611 .flags = MWAIT2flg(0x50) | CPUIDLE_FLAG_TLB_FLUSHED, 612 .exit_latency = 600, 613 .target_residency = 1800, 614 .enter = &intel_idle, 615 .enter_s2idle = intel_idle_s2idle, }, 616 { 617 .name = "C10", 618 .desc = "MWAIT 0x60", 619 .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, 620 .exit_latency = 2600, 621 .target_residency = 7700, 622 .enter = &intel_idle, 623 .enter_s2idle = intel_idle_s2idle, }, 624 { 625 .enter = NULL } 626 }; 627 628 static struct cpuidle_state skl_cstates[] __initdata = { 629 { 630 .name = "C1", 631 .desc = "MWAIT 0x00", 632 .flags = MWAIT2flg(0x00), 633 .exit_latency = 2, 634 .target_residency = 2, 635 .enter = &intel_idle, 636 .enter_s2idle = intel_idle_s2idle, }, 637 { 638 .name = "C1E", 639 .desc = "MWAIT 0x01", 640 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 641 .exit_latency = 10, 642 .target_residency = 20, 643 .enter = &intel_idle, 644 .enter_s2idle = intel_idle_s2idle, }, 645 { 646 .name = "C3", 647 .desc = "MWAIT 0x10", 648 .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, 649 .exit_latency = 70, 650 .target_residency = 100, 651 .enter = &intel_idle, 652 .enter_s2idle = intel_idle_s2idle, }, 653 { 654 .name = "C6", 655 .desc = "MWAIT 0x20", 656 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 657 .exit_latency = 85, 658 .target_residency = 200, 659 .enter = &intel_idle, 660 .enter_s2idle = intel_idle_s2idle, }, 661 { 662 .name = "C7s", 663 .desc = "MWAIT 0x33", 664 .flags = MWAIT2flg(0x33) | CPUIDLE_FLAG_TLB_FLUSHED, 665 .exit_latency = 124, 666 .target_residency = 800, 667 .enter = &intel_idle, 668 .enter_s2idle = intel_idle_s2idle, }, 669 { 670 .name = "C8", 671 .desc = "MWAIT 0x40", 672 .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED, 673 .exit_latency = 200, 674 .target_residency = 800, 675 .enter = &intel_idle, 676 .enter_s2idle = intel_idle_s2idle, }, 677 { 678 .name = "C9", 679 .desc = "MWAIT 0x50", 680 .flags = MWAIT2flg(0x50) | CPUIDLE_FLAG_TLB_FLUSHED, 681 .exit_latency = 480, 682 .target_residency = 5000, 683 .enter = &intel_idle, 684 .enter_s2idle = intel_idle_s2idle, }, 685 { 686 .name = "C10", 687 .desc = "MWAIT 0x60", 688 .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, 689 .exit_latency = 890, 690 .target_residency = 5000, 691 .enter = &intel_idle, 692 .enter_s2idle = intel_idle_s2idle, }, 693 { 694 .enter = NULL } 695 }; 696 697 static struct cpuidle_state skx_cstates[] __initdata = { 698 { 699 .name = "C1", 700 .desc = "MWAIT 0x00", 701 .flags = MWAIT2flg(0x00), 702 .exit_latency = 2, 703 .target_residency = 2, 704 .enter = &intel_idle, 705 .enter_s2idle = intel_idle_s2idle, }, 706 { 707 .name = "C1E", 708 .desc = "MWAIT 0x01", 709 .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, 710 .exit_latency = 10, 711 .target_residency = 20, 712 .enter = &intel_idle, 713 .enter_s2idle = intel_idle_s2idle, }, 714 { 715 .name = "C6", 716 .desc = "MWAIT 0x20", 717 .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, 718 .exit_latency = 133, 719 .target_residency = 600, 720 .enter = &intel_idle, 721 .enter_s2idle = intel_idle_s2idle, }, 722 { 723 .enter = NULL } 724 }; 725 726 static struct cpuidle_state icx_cstates[] __initdata = { 727 { 728 .name = "C1", 729 .desc = "MWAIT 0x00", 730 .flags = MWAIT2flg(0x00), 731 .exit_latency = 1, 732 .target_residency = 1, 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 = 4, 740 .target_residency = 4, 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 = 128, 748 .target_residency = 384, 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_icx __initconst = { 1060 .state_table = icx_cstates, 1061 .disable_promotion_to_c1e = true, 1062 .use_acpi = true, 1063 }; 1064 1065 static const struct idle_cpu idle_cpu_avn __initconst = { 1066 .state_table = avn_cstates, 1067 .disable_promotion_to_c1e = true, 1068 .use_acpi = true, 1069 }; 1070 1071 static const struct idle_cpu idle_cpu_knl __initconst = { 1072 .state_table = knl_cstates, 1073 .use_acpi = true, 1074 }; 1075 1076 static const struct idle_cpu idle_cpu_bxt __initconst = { 1077 .state_table = bxt_cstates, 1078 .disable_promotion_to_c1e = true, 1079 }; 1080 1081 static const struct idle_cpu idle_cpu_dnv __initconst = { 1082 .state_table = dnv_cstates, 1083 .disable_promotion_to_c1e = true, 1084 .use_acpi = true, 1085 }; 1086 1087 static const struct x86_cpu_id intel_idle_ids[] __initconst = { 1088 X86_MATCH_INTEL_FAM6_MODEL(NEHALEM_EP, &idle_cpu_nhx), 1089 X86_MATCH_INTEL_FAM6_MODEL(NEHALEM, &idle_cpu_nehalem), 1090 X86_MATCH_INTEL_FAM6_MODEL(NEHALEM_G, &idle_cpu_nehalem), 1091 X86_MATCH_INTEL_FAM6_MODEL(WESTMERE, &idle_cpu_nehalem), 1092 X86_MATCH_INTEL_FAM6_MODEL(WESTMERE_EP, &idle_cpu_nhx), 1093 X86_MATCH_INTEL_FAM6_MODEL(NEHALEM_EX, &idle_cpu_nhx), 1094 X86_MATCH_INTEL_FAM6_MODEL(ATOM_BONNELL, &idle_cpu_atom), 1095 X86_MATCH_INTEL_FAM6_MODEL(ATOM_BONNELL_MID, &idle_cpu_lincroft), 1096 X86_MATCH_INTEL_FAM6_MODEL(WESTMERE_EX, &idle_cpu_nhx), 1097 X86_MATCH_INTEL_FAM6_MODEL(SANDYBRIDGE, &idle_cpu_snb), 1098 X86_MATCH_INTEL_FAM6_MODEL(SANDYBRIDGE_X, &idle_cpu_snx), 1099 X86_MATCH_INTEL_FAM6_MODEL(ATOM_SALTWELL, &idle_cpu_atom), 1100 X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT, &idle_cpu_byt), 1101 X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_MID, &idle_cpu_tangier), 1102 X86_MATCH_INTEL_FAM6_MODEL(ATOM_AIRMONT, &idle_cpu_cht), 1103 X86_MATCH_INTEL_FAM6_MODEL(IVYBRIDGE, &idle_cpu_ivb), 1104 X86_MATCH_INTEL_FAM6_MODEL(IVYBRIDGE_X, &idle_cpu_ivt), 1105 X86_MATCH_INTEL_FAM6_MODEL(HASWELL, &idle_cpu_hsw), 1106 X86_MATCH_INTEL_FAM6_MODEL(HASWELL_X, &idle_cpu_hsx), 1107 X86_MATCH_INTEL_FAM6_MODEL(HASWELL_L, &idle_cpu_hsw), 1108 X86_MATCH_INTEL_FAM6_MODEL(HASWELL_G, &idle_cpu_hsw), 1109 X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_D, &idle_cpu_avn), 1110 X86_MATCH_INTEL_FAM6_MODEL(BROADWELL, &idle_cpu_bdw), 1111 X86_MATCH_INTEL_FAM6_MODEL(BROADWELL_G, &idle_cpu_bdw), 1112 X86_MATCH_INTEL_FAM6_MODEL(BROADWELL_X, &idle_cpu_bdx), 1113 X86_MATCH_INTEL_FAM6_MODEL(BROADWELL_D, &idle_cpu_bdx), 1114 X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_L, &idle_cpu_skl), 1115 X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE, &idle_cpu_skl), 1116 X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE_L, &idle_cpu_skl), 1117 X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE, &idle_cpu_skl), 1118 X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_X, &idle_cpu_skx), 1119 X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_X, &idle_cpu_icx), 1120 X86_MATCH_INTEL_FAM6_MODEL(XEON_PHI_KNL, &idle_cpu_knl), 1121 X86_MATCH_INTEL_FAM6_MODEL(XEON_PHI_KNM, &idle_cpu_knl), 1122 X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT, &idle_cpu_bxt), 1123 X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT_PLUS, &idle_cpu_bxt), 1124 X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT_D, &idle_cpu_dnv), 1125 X86_MATCH_INTEL_FAM6_MODEL(ATOM_TREMONT_D, &idle_cpu_dnv), 1126 {} 1127 }; 1128 1129 static const struct x86_cpu_id intel_mwait_ids[] __initconst = { 1130 X86_MATCH_VENDOR_FAM_FEATURE(INTEL, 6, X86_FEATURE_MWAIT, NULL), 1131 {} 1132 }; 1133 1134 static bool __init intel_idle_max_cstate_reached(int cstate) 1135 { 1136 if (cstate + 1 > max_cstate) { 1137 pr_info("max_cstate %d reached\n", max_cstate); 1138 return true; 1139 } 1140 return false; 1141 } 1142 1143 static bool __init intel_idle_state_needs_timer_stop(struct cpuidle_state *state) 1144 { 1145 unsigned long eax = flg2MWAIT(state->flags); 1146 1147 if (boot_cpu_has(X86_FEATURE_ARAT)) 1148 return false; 1149 1150 /* 1151 * Switch over to one-shot tick broadcast if the target C-state 1152 * is deeper than C1. 1153 */ 1154 return !!((eax >> MWAIT_SUBSTATE_SIZE) & MWAIT_CSTATE_MASK); 1155 } 1156 1157 #ifdef CONFIG_ACPI_PROCESSOR_CSTATE 1158 #include <acpi/processor.h> 1159 1160 static bool no_acpi __read_mostly; 1161 module_param(no_acpi, bool, 0444); 1162 MODULE_PARM_DESC(no_acpi, "Do not use ACPI _CST for building the idle states list"); 1163 1164 static bool force_use_acpi __read_mostly; /* No effect if no_acpi is set. */ 1165 module_param_named(use_acpi, force_use_acpi, bool, 0444); 1166 MODULE_PARM_DESC(use_acpi, "Use ACPI _CST for building the idle states list"); 1167 1168 static struct acpi_processor_power acpi_state_table __initdata; 1169 1170 /** 1171 * intel_idle_cst_usable - Check if the _CST information can be used. 1172 * 1173 * Check if all of the C-states listed by _CST in the max_cstate range are 1174 * ACPI_CSTATE_FFH, which means that they should be entered via MWAIT. 1175 */ 1176 static bool __init intel_idle_cst_usable(void) 1177 { 1178 int cstate, limit; 1179 1180 limit = min_t(int, min_t(int, CPUIDLE_STATE_MAX, max_cstate + 1), 1181 acpi_state_table.count); 1182 1183 for (cstate = 1; cstate < limit; cstate++) { 1184 struct acpi_processor_cx *cx = &acpi_state_table.states[cstate]; 1185 1186 if (cx->entry_method != ACPI_CSTATE_FFH) 1187 return false; 1188 } 1189 1190 return true; 1191 } 1192 1193 static bool __init intel_idle_acpi_cst_extract(void) 1194 { 1195 unsigned int cpu; 1196 1197 if (no_acpi) { 1198 pr_debug("Not allowed to use ACPI _CST\n"); 1199 return false; 1200 } 1201 1202 for_each_possible_cpu(cpu) { 1203 struct acpi_processor *pr = per_cpu(processors, cpu); 1204 1205 if (!pr) 1206 continue; 1207 1208 if (acpi_processor_evaluate_cst(pr->handle, cpu, &acpi_state_table)) 1209 continue; 1210 1211 acpi_state_table.count++; 1212 1213 if (!intel_idle_cst_usable()) 1214 continue; 1215 1216 if (!acpi_processor_claim_cst_control()) 1217 break; 1218 1219 return true; 1220 } 1221 1222 acpi_state_table.count = 0; 1223 pr_debug("ACPI _CST not found or not usable\n"); 1224 return false; 1225 } 1226 1227 static void __init intel_idle_init_cstates_acpi(struct cpuidle_driver *drv) 1228 { 1229 int cstate, limit = min_t(int, CPUIDLE_STATE_MAX, acpi_state_table.count); 1230 1231 /* 1232 * If limit > 0, intel_idle_cst_usable() has returned 'true', so all of 1233 * the interesting states are ACPI_CSTATE_FFH. 1234 */ 1235 for (cstate = 1; cstate < limit; cstate++) { 1236 struct acpi_processor_cx *cx; 1237 struct cpuidle_state *state; 1238 1239 if (intel_idle_max_cstate_reached(cstate - 1)) 1240 break; 1241 1242 cx = &acpi_state_table.states[cstate]; 1243 1244 state = &drv->states[drv->state_count++]; 1245 1246 snprintf(state->name, CPUIDLE_NAME_LEN, "C%d_ACPI", cstate); 1247 strlcpy(state->desc, cx->desc, CPUIDLE_DESC_LEN); 1248 state->exit_latency = cx->latency; 1249 /* 1250 * For C1-type C-states use the same number for both the exit 1251 * latency and target residency, because that is the case for 1252 * C1 in the majority of the static C-states tables above. 1253 * For the other types of C-states, however, set the target 1254 * residency to 3 times the exit latency which should lead to 1255 * a reasonable balance between energy-efficiency and 1256 * performance in the majority of interesting cases. 1257 */ 1258 state->target_residency = cx->latency; 1259 if (cx->type > ACPI_STATE_C1) 1260 state->target_residency *= 3; 1261 1262 state->flags = MWAIT2flg(cx->address); 1263 if (cx->type > ACPI_STATE_C2) 1264 state->flags |= CPUIDLE_FLAG_TLB_FLUSHED; 1265 1266 if (disabled_states_mask & BIT(cstate)) 1267 state->flags |= CPUIDLE_FLAG_OFF; 1268 1269 if (intel_idle_state_needs_timer_stop(state)) 1270 state->flags |= CPUIDLE_FLAG_TIMER_STOP; 1271 1272 state->enter = intel_idle; 1273 state->enter_s2idle = intel_idle_s2idle; 1274 } 1275 } 1276 1277 static bool __init intel_idle_off_by_default(u32 mwait_hint) 1278 { 1279 int cstate, limit; 1280 1281 /* 1282 * If there are no _CST C-states, do not disable any C-states by 1283 * default. 1284 */ 1285 if (!acpi_state_table.count) 1286 return false; 1287 1288 limit = min_t(int, CPUIDLE_STATE_MAX, acpi_state_table.count); 1289 /* 1290 * If limit > 0, intel_idle_cst_usable() has returned 'true', so all of 1291 * the interesting states are ACPI_CSTATE_FFH. 1292 */ 1293 for (cstate = 1; cstate < limit; cstate++) { 1294 if (acpi_state_table.states[cstate].address == mwait_hint) 1295 return false; 1296 } 1297 return true; 1298 } 1299 #else /* !CONFIG_ACPI_PROCESSOR_CSTATE */ 1300 #define force_use_acpi (false) 1301 1302 static inline bool intel_idle_acpi_cst_extract(void) { return false; } 1303 static inline void intel_idle_init_cstates_acpi(struct cpuidle_driver *drv) { } 1304 static inline bool intel_idle_off_by_default(u32 mwait_hint) { return false; } 1305 #endif /* !CONFIG_ACPI_PROCESSOR_CSTATE */ 1306 1307 /** 1308 * ivt_idle_state_table_update - Tune the idle states table for Ivy Town. 1309 * 1310 * Tune IVT multi-socket targets. 1311 * Assumption: num_sockets == (max_package_num + 1). 1312 */ 1313 static void __init ivt_idle_state_table_update(void) 1314 { 1315 /* IVT uses a different table for 1-2, 3-4, and > 4 sockets */ 1316 int cpu, package_num, num_sockets = 1; 1317 1318 for_each_online_cpu(cpu) { 1319 package_num = topology_physical_package_id(cpu); 1320 if (package_num + 1 > num_sockets) { 1321 num_sockets = package_num + 1; 1322 1323 if (num_sockets > 4) { 1324 cpuidle_state_table = ivt_cstates_8s; 1325 return; 1326 } 1327 } 1328 } 1329 1330 if (num_sockets > 2) 1331 cpuidle_state_table = ivt_cstates_4s; 1332 1333 /* else, 1 and 2 socket systems use default ivt_cstates */ 1334 } 1335 1336 /** 1337 * irtl_2_usec - IRTL to microseconds conversion. 1338 * @irtl: IRTL MSR value. 1339 * 1340 * Translate the IRTL (Interrupt Response Time Limit) MSR value to microseconds. 1341 */ 1342 static unsigned long long __init irtl_2_usec(unsigned long long irtl) 1343 { 1344 static const unsigned int irtl_ns_units[] __initconst = { 1345 1, 32, 1024, 32768, 1048576, 33554432, 0, 0 1346 }; 1347 unsigned long long ns; 1348 1349 if (!irtl) 1350 return 0; 1351 1352 ns = irtl_ns_units[(irtl >> 10) & 0x7]; 1353 1354 return div_u64((irtl & 0x3FF) * ns, NSEC_PER_USEC); 1355 } 1356 1357 /** 1358 * bxt_idle_state_table_update - Fix up the Broxton idle states table. 1359 * 1360 * On BXT, trust the IRTL (Interrupt Response Time Limit) MSR to show the 1361 * definitive maximum latency and use the same value for target_residency. 1362 */ 1363 static void __init bxt_idle_state_table_update(void) 1364 { 1365 unsigned long long msr; 1366 unsigned int usec; 1367 1368 rdmsrl(MSR_PKGC6_IRTL, msr); 1369 usec = irtl_2_usec(msr); 1370 if (usec) { 1371 bxt_cstates[2].exit_latency = usec; 1372 bxt_cstates[2].target_residency = usec; 1373 } 1374 1375 rdmsrl(MSR_PKGC7_IRTL, msr); 1376 usec = irtl_2_usec(msr); 1377 if (usec) { 1378 bxt_cstates[3].exit_latency = usec; 1379 bxt_cstates[3].target_residency = usec; 1380 } 1381 1382 rdmsrl(MSR_PKGC8_IRTL, msr); 1383 usec = irtl_2_usec(msr); 1384 if (usec) { 1385 bxt_cstates[4].exit_latency = usec; 1386 bxt_cstates[4].target_residency = usec; 1387 } 1388 1389 rdmsrl(MSR_PKGC9_IRTL, msr); 1390 usec = irtl_2_usec(msr); 1391 if (usec) { 1392 bxt_cstates[5].exit_latency = usec; 1393 bxt_cstates[5].target_residency = usec; 1394 } 1395 1396 rdmsrl(MSR_PKGC10_IRTL, msr); 1397 usec = irtl_2_usec(msr); 1398 if (usec) { 1399 bxt_cstates[6].exit_latency = usec; 1400 bxt_cstates[6].target_residency = usec; 1401 } 1402 1403 } 1404 1405 /** 1406 * sklh_idle_state_table_update - Fix up the Sky Lake idle states table. 1407 * 1408 * On SKL-H (model 0x5e) skip C8 and C9 if C10 is enabled and SGX disabled. 1409 */ 1410 static void __init sklh_idle_state_table_update(void) 1411 { 1412 unsigned long long msr; 1413 unsigned int eax, ebx, ecx, edx; 1414 1415 1416 /* if PC10 disabled via cmdline intel_idle.max_cstate=7 or shallower */ 1417 if (max_cstate <= 7) 1418 return; 1419 1420 /* if PC10 not present in CPUID.MWAIT.EDX */ 1421 if ((mwait_substates & (0xF << 28)) == 0) 1422 return; 1423 1424 rdmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr); 1425 1426 /* PC10 is not enabled in PKG C-state limit */ 1427 if ((msr & 0xF) != 8) 1428 return; 1429 1430 ecx = 0; 1431 cpuid(7, &eax, &ebx, &ecx, &edx); 1432 1433 /* if SGX is present */ 1434 if (ebx & (1 << 2)) { 1435 1436 rdmsrl(MSR_IA32_FEAT_CTL, msr); 1437 1438 /* if SGX is enabled */ 1439 if (msr & (1 << 18)) 1440 return; 1441 } 1442 1443 skl_cstates[5].flags |= CPUIDLE_FLAG_UNUSABLE; /* C8-SKL */ 1444 skl_cstates[6].flags |= CPUIDLE_FLAG_UNUSABLE; /* C9-SKL */ 1445 } 1446 1447 static bool __init intel_idle_verify_cstate(unsigned int mwait_hint) 1448 { 1449 unsigned int mwait_cstate = MWAIT_HINT2CSTATE(mwait_hint) + 1; 1450 unsigned int num_substates = (mwait_substates >> mwait_cstate * 4) & 1451 MWAIT_SUBSTATE_MASK; 1452 1453 /* Ignore the C-state if there are NO sub-states in CPUID for it. */ 1454 if (num_substates == 0) 1455 return false; 1456 1457 if (mwait_cstate > 2 && !boot_cpu_has(X86_FEATURE_NONSTOP_TSC)) 1458 mark_tsc_unstable("TSC halts in idle states deeper than C2"); 1459 1460 return true; 1461 } 1462 1463 static void __init intel_idle_init_cstates_icpu(struct cpuidle_driver *drv) 1464 { 1465 int cstate; 1466 1467 switch (boot_cpu_data.x86_model) { 1468 case INTEL_FAM6_IVYBRIDGE_X: 1469 ivt_idle_state_table_update(); 1470 break; 1471 case INTEL_FAM6_ATOM_GOLDMONT: 1472 case INTEL_FAM6_ATOM_GOLDMONT_PLUS: 1473 bxt_idle_state_table_update(); 1474 break; 1475 case INTEL_FAM6_SKYLAKE: 1476 sklh_idle_state_table_update(); 1477 break; 1478 } 1479 1480 for (cstate = 0; cstate < CPUIDLE_STATE_MAX; ++cstate) { 1481 unsigned int mwait_hint; 1482 1483 if (intel_idle_max_cstate_reached(cstate)) 1484 break; 1485 1486 if (!cpuidle_state_table[cstate].enter && 1487 !cpuidle_state_table[cstate].enter_s2idle) 1488 break; 1489 1490 /* If marked as unusable, skip this state. */ 1491 if (cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_UNUSABLE) { 1492 pr_debug("state %s is disabled\n", 1493 cpuidle_state_table[cstate].name); 1494 continue; 1495 } 1496 1497 mwait_hint = flg2MWAIT(cpuidle_state_table[cstate].flags); 1498 if (!intel_idle_verify_cstate(mwait_hint)) 1499 continue; 1500 1501 /* Structure copy. */ 1502 drv->states[drv->state_count] = cpuidle_state_table[cstate]; 1503 1504 if ((disabled_states_mask & BIT(drv->state_count)) || 1505 ((icpu->use_acpi || force_use_acpi) && 1506 intel_idle_off_by_default(mwait_hint) && 1507 !(cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_ALWAYS_ENABLE))) 1508 drv->states[drv->state_count].flags |= CPUIDLE_FLAG_OFF; 1509 1510 if (intel_idle_state_needs_timer_stop(&drv->states[drv->state_count])) 1511 drv->states[drv->state_count].flags |= CPUIDLE_FLAG_TIMER_STOP; 1512 1513 drv->state_count++; 1514 } 1515 1516 if (icpu->byt_auto_demotion_disable_flag) { 1517 wrmsrl(MSR_CC6_DEMOTION_POLICY_CONFIG, 0); 1518 wrmsrl(MSR_MC6_DEMOTION_POLICY_CONFIG, 0); 1519 } 1520 } 1521 1522 /** 1523 * intel_idle_cpuidle_driver_init - Create the list of available idle states. 1524 * @drv: cpuidle driver structure to initialize. 1525 */ 1526 static void __init intel_idle_cpuidle_driver_init(struct cpuidle_driver *drv) 1527 { 1528 cpuidle_poll_state_init(drv); 1529 1530 if (disabled_states_mask & BIT(0)) 1531 drv->states[0].flags |= CPUIDLE_FLAG_OFF; 1532 1533 drv->state_count = 1; 1534 1535 if (icpu) 1536 intel_idle_init_cstates_icpu(drv); 1537 else 1538 intel_idle_init_cstates_acpi(drv); 1539 } 1540 1541 static void auto_demotion_disable(void) 1542 { 1543 unsigned long long msr_bits; 1544 1545 rdmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr_bits); 1546 msr_bits &= ~auto_demotion_disable_flags; 1547 wrmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr_bits); 1548 } 1549 1550 static void c1e_promotion_disable(void) 1551 { 1552 unsigned long long msr_bits; 1553 1554 rdmsrl(MSR_IA32_POWER_CTL, msr_bits); 1555 msr_bits &= ~0x2; 1556 wrmsrl(MSR_IA32_POWER_CTL, msr_bits); 1557 } 1558 1559 /** 1560 * intel_idle_cpu_init - Register the target CPU with the cpuidle core. 1561 * @cpu: CPU to initialize. 1562 * 1563 * Register a cpuidle device object for @cpu and update its MSRs in accordance 1564 * with the processor model flags. 1565 */ 1566 static int intel_idle_cpu_init(unsigned int cpu) 1567 { 1568 struct cpuidle_device *dev; 1569 1570 dev = per_cpu_ptr(intel_idle_cpuidle_devices, cpu); 1571 dev->cpu = cpu; 1572 1573 if (cpuidle_register_device(dev)) { 1574 pr_debug("cpuidle_register_device %d failed!\n", cpu); 1575 return -EIO; 1576 } 1577 1578 if (auto_demotion_disable_flags) 1579 auto_demotion_disable(); 1580 1581 if (disable_promotion_to_c1e) 1582 c1e_promotion_disable(); 1583 1584 return 0; 1585 } 1586 1587 static int intel_idle_cpu_online(unsigned int cpu) 1588 { 1589 struct cpuidle_device *dev; 1590 1591 if (!boot_cpu_has(X86_FEATURE_ARAT)) 1592 tick_broadcast_enable(); 1593 1594 /* 1595 * Some systems can hotplug a cpu at runtime after 1596 * the kernel has booted, we have to initialize the 1597 * driver in this case 1598 */ 1599 dev = per_cpu_ptr(intel_idle_cpuidle_devices, cpu); 1600 if (!dev->registered) 1601 return intel_idle_cpu_init(cpu); 1602 1603 return 0; 1604 } 1605 1606 /** 1607 * intel_idle_cpuidle_devices_uninit - Unregister all cpuidle devices. 1608 */ 1609 static void __init intel_idle_cpuidle_devices_uninit(void) 1610 { 1611 int i; 1612 1613 for_each_online_cpu(i) 1614 cpuidle_unregister_device(per_cpu_ptr(intel_idle_cpuidle_devices, i)); 1615 } 1616 1617 static int __init intel_idle_init(void) 1618 { 1619 const struct x86_cpu_id *id; 1620 unsigned int eax, ebx, ecx; 1621 int retval; 1622 1623 /* Do not load intel_idle at all for now if idle= is passed */ 1624 if (boot_option_idle_override != IDLE_NO_OVERRIDE) 1625 return -ENODEV; 1626 1627 if (max_cstate == 0) { 1628 pr_debug("disabled\n"); 1629 return -EPERM; 1630 } 1631 1632 id = x86_match_cpu(intel_idle_ids); 1633 if (id) { 1634 if (!boot_cpu_has(X86_FEATURE_MWAIT)) { 1635 pr_debug("Please enable MWAIT in BIOS SETUP\n"); 1636 return -ENODEV; 1637 } 1638 } else { 1639 id = x86_match_cpu(intel_mwait_ids); 1640 if (!id) 1641 return -ENODEV; 1642 } 1643 1644 if (boot_cpu_data.cpuid_level < CPUID_MWAIT_LEAF) 1645 return -ENODEV; 1646 1647 cpuid(CPUID_MWAIT_LEAF, &eax, &ebx, &ecx, &mwait_substates); 1648 1649 if (!(ecx & CPUID5_ECX_EXTENSIONS_SUPPORTED) || 1650 !(ecx & CPUID5_ECX_INTERRUPT_BREAK) || 1651 !mwait_substates) 1652 return -ENODEV; 1653 1654 pr_debug("MWAIT substates: 0x%x\n", mwait_substates); 1655 1656 icpu = (const struct idle_cpu *)id->driver_data; 1657 if (icpu) { 1658 cpuidle_state_table = icpu->state_table; 1659 auto_demotion_disable_flags = icpu->auto_demotion_disable_flags; 1660 disable_promotion_to_c1e = icpu->disable_promotion_to_c1e; 1661 if (icpu->use_acpi || force_use_acpi) 1662 intel_idle_acpi_cst_extract(); 1663 } else if (!intel_idle_acpi_cst_extract()) { 1664 return -ENODEV; 1665 } 1666 1667 pr_debug("v" INTEL_IDLE_VERSION " model 0x%X\n", 1668 boot_cpu_data.x86_model); 1669 1670 intel_idle_cpuidle_devices = alloc_percpu(struct cpuidle_device); 1671 if (!intel_idle_cpuidle_devices) 1672 return -ENOMEM; 1673 1674 intel_idle_cpuidle_driver_init(&intel_idle_driver); 1675 1676 retval = cpuidle_register_driver(&intel_idle_driver); 1677 if (retval) { 1678 struct cpuidle_driver *drv = cpuidle_get_driver(); 1679 printk(KERN_DEBUG pr_fmt("intel_idle yielding to %s\n"), 1680 drv ? drv->name : "none"); 1681 goto init_driver_fail; 1682 } 1683 1684 retval = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "idle/intel:online", 1685 intel_idle_cpu_online, NULL); 1686 if (retval < 0) 1687 goto hp_setup_fail; 1688 1689 pr_debug("Local APIC timer is reliable in %s\n", 1690 boot_cpu_has(X86_FEATURE_ARAT) ? "all C-states" : "C1"); 1691 1692 return 0; 1693 1694 hp_setup_fail: 1695 intel_idle_cpuidle_devices_uninit(); 1696 cpuidle_unregister_driver(&intel_idle_driver); 1697 init_driver_fail: 1698 free_percpu(intel_idle_cpuidle_devices); 1699 return retval; 1700 1701 } 1702 device_initcall(intel_idle_init); 1703 1704 /* 1705 * We are not really modular, but we used to support that. Meaning we also 1706 * support "intel_idle.max_cstate=..." at boot and also a read-only export of 1707 * it at /sys/module/intel_idle/parameters/max_cstate -- so using module_param 1708 * is the easiest way (currently) to continue doing that. 1709 */ 1710 module_param(max_cstate, int, 0444); 1711 /* 1712 * The positions of the bits that are set in this number are the indices of the 1713 * idle states to be disabled by default (as reflected by the names of the 1714 * corresponding idle state directories in sysfs, "state0", "state1" ... 1715 * "state<i>" ..., where <i> is the index of the given state). 1716 */ 1717 module_param_named(states_off, disabled_states_mask, uint, 0444); 1718 MODULE_PARM_DESC(states_off, "Mask of disabled idle states"); 1719