| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Len Brown | 5183 | 56.95% | 34 | 22.52% |
| Rafael J. Wysocki | 1947 | 21.39% | 28 | 18.54% |
| Artem B. Bityutskiy | 268 | 2.94% | 15 | 9.93% |
| Andi Kleen | 260 | 2.86% | 1 | 0.66% |
| Rui Zhang | 246 | 2.70% | 3 | 1.99% |
| Peter Zijlstra | 225 | 2.47% | 13 | 8.61% |
| Chen Yu | 121 | 1.33% | 3 | 1.99% |
| Andy Shevchenko | 117 | 1.29% | 2 | 1.32% |
| Arjan van de Ven | 105 | 1.15% | 2 | 1.32% |
| Thomas Gleixner | 89 | 0.98% | 4 | 2.65% |
| Chang S. Bae | 56 | 0.62% | 1 | 0.66% |
| Sebastian Andrzej Siewior | 56 | 0.62% | 1 | 0.66% |
| Suresh B. Siddha | 54 | 0.59% | 1 | 0.66% |
| Deepthi Dharwar | 52 | 0.57% | 2 | 1.32% |
| Jacob jun Pan | 51 | 0.56% | 1 | 0.66% |
| Jan Beulich | 48 | 0.53% | 2 | 1.32% |
| Dasaratharaman Chandramouli | 40 | 0.44% | 1 | 0.66% |
| Thomas Renninger | 29 | 0.32% | 3 | 1.99% |
| Jiang Liu | 24 | 0.26% | 1 | 0.66% |
| Richard Cochran | 20 | 0.22% | 3 | 1.99% |
| Bartlomiej Zolnierkiewicz | 19 | 0.21% | 3 | 1.99% |
| Joe Perches | 11 | 0.12% | 1 | 0.66% |
| Konrad Rzeszutek Wilk | 10 | 0.11% | 1 | 0.66% |
| David E. Box | 7 | 0.08% | 1 | 0.66% |
| Shaohua Li | 6 | 0.07% | 1 | 0.66% |
| Linus Torvalds | 6 | 0.07% | 1 | 0.66% |
| Piotr Luc | 5 | 0.05% | 1 | 0.66% |
| Jan Kiszka | 5 | 0.05% | 1 | 0.66% |
| Dave Hansen | 5 | 0.05% | 1 | 0.66% |
| Paul Gortmaker | 5 | 0.05% | 2 | 1.32% |
| Mel Gorman | 5 | 0.05% | 1 | 0.66% |
| Neal Liu | 4 | 0.04% | 1 | 0.66% |
| Linus Torvalds (pre-git) | 3 | 0.03% | 2 | 1.32% |
| H. Peter Anvin | 3 | 0.03% | 1 | 0.66% |
| Tejun Heo | 2 | 0.02% | 1 | 0.66% |
| Christoph Jaeger | 2 | 0.02% | 1 | 0.66% |
| Alexander Monakov | 2 | 0.02% | 1 | 0.66% |
| Bockholdt Arne | 2 | 0.02% | 1 | 0.66% |
| Wolfram Sang | 1 | 0.01% | 1 | 0.66% |
| Daniel Lezcano | 1 | 0.01% | 1 | 0.66% |
| Chris Metcalf | 1 | 0.01% | 1 | 0.66% |
| Mathias Krause | 1 | 0.01% | 1 | 0.66% |
| Ben Hutchings | 1 | 0.01% | 1 | 0.66% |
| Namhyung Kim | 1 | 0.01% | 1 | 0.66% |
| Tom Rix | 1 | 0.01% | 1 | 0.66% |
| Sean Christopherson | 1 | 0.01% | 1 | 0.66% |
| Total | 9101 | 151 |
// SPDX-License-Identifier: GPL-2.0-only /* * intel_idle.c - native hardware idle loop for modern Intel processors * * Copyright (c) 2013 - 2020, Intel Corporation. * Len Brown <len.brown@intel.com> * Rafael J. Wysocki <rafael.j.wysocki@intel.com> */ /* * intel_idle is a cpuidle driver that loads on all Intel CPUs with MWAIT * in lieu of the legacy ACPI processor_idle driver. The intent is to * make Linux more efficient on these processors, as intel_idle knows * more than ACPI, as well as make Linux more immune to ACPI BIOS bugs. */ /* * Design Assumptions * * All CPUs have same idle states as boot CPU * * Chipset BM_STS (bus master status) bit is a NOP * for preventing entry into deep C-states * * CPU will flush caches as needed when entering a C-state via MWAIT * (in contrast to entering ACPI C3, in which case the WBINVD * instruction needs to be executed to flush the caches) */ /* * Known limitations * * ACPI has a .suspend hack to turn off deep c-statees during suspend * to avoid complications with the lapic timer workaround. * Have not seen issues with suspend, but may need same workaround here. * */ /* un-comment DEBUG to enable pr_debug() statements */ /* #define DEBUG */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/acpi.h> #include <linux/kernel.h> #include <linux/cpuidle.h> #include <linux/tick.h> #include <trace/events/power.h> #include <linux/sched.h> #include <linux/sched/smt.h> #include <linux/notifier.h> #include <linux/cpu.h> #include <linux/moduleparam.h> #include <asm/cpu_device_id.h> #include <asm/intel-family.h> #include <asm/nospec-branch.h> #include <asm/mwait.h> #include <asm/msr.h> #include <asm/fpu/api.h> #define INTEL_IDLE_VERSION "0.5.1" static struct cpuidle_driver intel_idle_driver = { .name = "intel_idle", .owner = THIS_MODULE, }; /* intel_idle.max_cstate=0 disables driver */ static int max_cstate = CPUIDLE_STATE_MAX - 1; static unsigned int disabled_states_mask __read_mostly; static unsigned int preferred_states_mask __read_mostly; static bool force_irq_on __read_mostly; static struct cpuidle_device __percpu *intel_idle_cpuidle_devices; static unsigned long auto_demotion_disable_flags; static enum { C1E_PROMOTION_PRESERVE, C1E_PROMOTION_ENABLE, C1E_PROMOTION_DISABLE } c1e_promotion = C1E_PROMOTION_PRESERVE; struct idle_cpu { struct cpuidle_state *state_table; /* * Hardware C-state auto-demotion may not always be optimal. * Indicate which enable bits to clear here. */ unsigned long auto_demotion_disable_flags; bool byt_auto_demotion_disable_flag; bool disable_promotion_to_c1e; bool use_acpi; }; static const struct idle_cpu *icpu __initdata; static struct cpuidle_state *cpuidle_state_table __initdata; static unsigned int mwait_substates __initdata; /* * Enable interrupts before entering the C-state. On some platforms and for * some C-states, this may measurably decrease interrupt latency. */ #define CPUIDLE_FLAG_IRQ_ENABLE BIT(14) /* * Enable this state by default even if the ACPI _CST does not list it. */ #define CPUIDLE_FLAG_ALWAYS_ENABLE BIT(15) /* * Disable IBRS across idle (when KERNEL_IBRS), is exclusive vs IRQ_ENABLE * above. */ #define CPUIDLE_FLAG_IBRS BIT(16) /* * Initialize large xstate for the C6-state entrance. */ #define CPUIDLE_FLAG_INIT_XSTATE BIT(17) /* * MWAIT takes an 8-bit "hint" in EAX "suggesting" * the C-state (top nibble) and sub-state (bottom nibble) * 0x00 means "MWAIT(C1)", 0x10 means "MWAIT(C2)" etc. * * We store the hint at the top of our "flags" for each state. */ #define flg2MWAIT(flags) (((flags) >> 24) & 0xFF) #define MWAIT2flg(eax) ((eax & 0xFF) << 24) static __always_inline int __intel_idle(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index) { struct cpuidle_state *state = &drv->states[index]; unsigned long eax = flg2MWAIT(state->flags); unsigned long ecx = 1; /* break on interrupt flag */ mwait_idle_with_hints(eax, ecx); return index; } /** * intel_idle - Ask the processor to enter the given idle state. * @dev: cpuidle device of the target CPU. * @drv: cpuidle driver (assumed to point to intel_idle_driver). * @index: Target idle state index. * * Use the MWAIT instruction to notify the processor that the CPU represented by * @dev is idle and it can try to enter the idle state corresponding to @index. * * If the local APIC timer is not known to be reliable in the target idle state, * enable one-shot tick broadcasting for the target CPU before executing MWAIT. * * Must be called under local_irq_disable(). */ static __cpuidle int intel_idle(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index) { return __intel_idle(dev, drv, index); } static __cpuidle int intel_idle_irq(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index) { int ret; raw_local_irq_enable(); ret = __intel_idle(dev, drv, index); raw_local_irq_disable(); return ret; } static __cpuidle int intel_idle_ibrs(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index) { bool smt_active = sched_smt_active(); u64 spec_ctrl = spec_ctrl_current(); int ret; if (smt_active) native_wrmsrl(MSR_IA32_SPEC_CTRL, 0); ret = __intel_idle(dev, drv, index); if (smt_active) native_wrmsrl(MSR_IA32_SPEC_CTRL, spec_ctrl); return ret; } static __cpuidle int intel_idle_xstate(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index) { fpu_idle_fpregs(); return __intel_idle(dev, drv, index); } /** * intel_idle_s2idle - Ask the processor to enter the given idle state. * @dev: cpuidle device of the target CPU. * @drv: cpuidle driver (assumed to point to intel_idle_driver). * @index: Target idle state index. * * Use the MWAIT instruction to notify the processor that the CPU represented by * @dev is idle and it can try to enter the idle state corresponding to @index. * * Invoked as a suspend-to-idle callback routine with frozen user space, frozen * scheduler tick and suspended scheduler clock on the target CPU. */ static __cpuidle int intel_idle_s2idle(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index) { unsigned long ecx = 1; /* break on interrupt flag */ struct cpuidle_state *state = &drv->states[index]; unsigned long eax = flg2MWAIT(state->flags); if (state->flags & CPUIDLE_FLAG_INIT_XSTATE) fpu_idle_fpregs(); mwait_idle_with_hints(eax, ecx); return 0; } /* * States are indexed by the cstate number, * which is also the index into the MWAIT hint array. * Thus C0 is a dummy. */ static struct cpuidle_state nehalem_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00), .exit_latency = 3, .target_residency = 6, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C1E", .desc = "MWAIT 0x01", .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, .exit_latency = 10, .target_residency = 20, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C3", .desc = "MWAIT 0x10", .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 20, .target_residency = 80, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x20", .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 200, .target_residency = 800, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state snb_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00), .exit_latency = 2, .target_residency = 2, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C1E", .desc = "MWAIT 0x01", .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, .exit_latency = 10, .target_residency = 20, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C3", .desc = "MWAIT 0x10", .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 80, .target_residency = 211, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x20", .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 104, .target_residency = 345, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C7", .desc = "MWAIT 0x30", .flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 109, .target_residency = 345, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state byt_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00), .exit_latency = 1, .target_residency = 1, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6N", .desc = "MWAIT 0x58", .flags = MWAIT2flg(0x58) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 300, .target_residency = 275, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6S", .desc = "MWAIT 0x52", .flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 500, .target_residency = 560, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C7", .desc = "MWAIT 0x60", .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 1200, .target_residency = 4000, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C7S", .desc = "MWAIT 0x64", .flags = MWAIT2flg(0x64) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 10000, .target_residency = 20000, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state cht_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00), .exit_latency = 1, .target_residency = 1, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6N", .desc = "MWAIT 0x58", .flags = MWAIT2flg(0x58) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 80, .target_residency = 275, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6S", .desc = "MWAIT 0x52", .flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 200, .target_residency = 560, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C7", .desc = "MWAIT 0x60", .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 1200, .target_residency = 4000, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C7S", .desc = "MWAIT 0x64", .flags = MWAIT2flg(0x64) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 10000, .target_residency = 20000, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state ivb_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00), .exit_latency = 1, .target_residency = 1, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C1E", .desc = "MWAIT 0x01", .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, .exit_latency = 10, .target_residency = 20, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C3", .desc = "MWAIT 0x10", .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 59, .target_residency = 156, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x20", .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 80, .target_residency = 300, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C7", .desc = "MWAIT 0x30", .flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 87, .target_residency = 300, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state ivt_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00), .exit_latency = 1, .target_residency = 1, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C1E", .desc = "MWAIT 0x01", .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, .exit_latency = 10, .target_residency = 80, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C3", .desc = "MWAIT 0x10", .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 59, .target_residency = 156, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x20", .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 82, .target_residency = 300, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state ivt_cstates_4s[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00), .exit_latency = 1, .target_residency = 1, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C1E", .desc = "MWAIT 0x01", .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, .exit_latency = 10, .target_residency = 250, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C3", .desc = "MWAIT 0x10", .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 59, .target_residency = 300, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x20", .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 84, .target_residency = 400, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state ivt_cstates_8s[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00), .exit_latency = 1, .target_residency = 1, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C1E", .desc = "MWAIT 0x01", .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, .exit_latency = 10, .target_residency = 500, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C3", .desc = "MWAIT 0x10", .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 59, .target_residency = 600, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x20", .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 88, .target_residency = 700, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state hsw_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00), .exit_latency = 2, .target_residency = 2, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C1E", .desc = "MWAIT 0x01", .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, .exit_latency = 10, .target_residency = 20, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C3", .desc = "MWAIT 0x10", .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 33, .target_residency = 100, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x20", .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 133, .target_residency = 400, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C7s", .desc = "MWAIT 0x32", .flags = MWAIT2flg(0x32) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 166, .target_residency = 500, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C8", .desc = "MWAIT 0x40", .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 300, .target_residency = 900, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C9", .desc = "MWAIT 0x50", .flags = MWAIT2flg(0x50) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 600, .target_residency = 1800, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C10", .desc = "MWAIT 0x60", .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 2600, .target_residency = 7700, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state bdw_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00), .exit_latency = 2, .target_residency = 2, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C1E", .desc = "MWAIT 0x01", .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, .exit_latency = 10, .target_residency = 20, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C3", .desc = "MWAIT 0x10", .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 40, .target_residency = 100, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x20", .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 133, .target_residency = 400, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C7s", .desc = "MWAIT 0x32", .flags = MWAIT2flg(0x32) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 166, .target_residency = 500, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C8", .desc = "MWAIT 0x40", .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 300, .target_residency = 900, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C9", .desc = "MWAIT 0x50", .flags = MWAIT2flg(0x50) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 600, .target_residency = 1800, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C10", .desc = "MWAIT 0x60", .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 2600, .target_residency = 7700, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state skl_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00), .exit_latency = 2, .target_residency = 2, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C1E", .desc = "MWAIT 0x01", .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, .exit_latency = 10, .target_residency = 20, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C3", .desc = "MWAIT 0x10", .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 70, .target_residency = 100, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x20", .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED | CPUIDLE_FLAG_IBRS, .exit_latency = 85, .target_residency = 200, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C7s", .desc = "MWAIT 0x33", .flags = MWAIT2flg(0x33) | CPUIDLE_FLAG_TLB_FLUSHED | CPUIDLE_FLAG_IBRS, .exit_latency = 124, .target_residency = 800, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C8", .desc = "MWAIT 0x40", .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED | CPUIDLE_FLAG_IBRS, .exit_latency = 200, .target_residency = 800, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C9", .desc = "MWAIT 0x50", .flags = MWAIT2flg(0x50) | CPUIDLE_FLAG_TLB_FLUSHED | CPUIDLE_FLAG_IBRS, .exit_latency = 480, .target_residency = 5000, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C10", .desc = "MWAIT 0x60", .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED | CPUIDLE_FLAG_IBRS, .exit_latency = 890, .target_residency = 5000, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state skx_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00) | CPUIDLE_FLAG_IRQ_ENABLE, .exit_latency = 2, .target_residency = 2, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C1E", .desc = "MWAIT 0x01", .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, .exit_latency = 10, .target_residency = 20, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x20", .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED | CPUIDLE_FLAG_IBRS, .exit_latency = 133, .target_residency = 600, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state icx_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00) | CPUIDLE_FLAG_IRQ_ENABLE, .exit_latency = 1, .target_residency = 1, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C1E", .desc = "MWAIT 0x01", .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, .exit_latency = 4, .target_residency = 4, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x20", .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 170, .target_residency = 600, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; /* * On AlderLake C1 has to be disabled if C1E is enabled, and vice versa. * C1E is enabled only if "C1E promotion" bit is set in MSR_IA32_POWER_CTL. * But in this case there is effectively no C1, because C1 requests are * promoted to C1E. If the "C1E promotion" bit is cleared, then both C1 * and C1E requests end up with C1, so there is effectively no C1E. * * By default we enable C1E and disable C1 by marking it with * 'CPUIDLE_FLAG_UNUSABLE'. */ static struct cpuidle_state adl_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00) | CPUIDLE_FLAG_UNUSABLE, .exit_latency = 1, .target_residency = 1, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C1E", .desc = "MWAIT 0x01", .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, .exit_latency = 2, .target_residency = 4, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x20", .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 220, .target_residency = 600, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C8", .desc = "MWAIT 0x40", .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 280, .target_residency = 800, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C10", .desc = "MWAIT 0x60", .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 680, .target_residency = 2000, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state adl_l_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00) | CPUIDLE_FLAG_UNUSABLE, .exit_latency = 1, .target_residency = 1, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C1E", .desc = "MWAIT 0x01", .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, .exit_latency = 2, .target_residency = 4, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x20", .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 170, .target_residency = 500, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C8", .desc = "MWAIT 0x40", .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 200, .target_residency = 600, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C10", .desc = "MWAIT 0x60", .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 230, .target_residency = 700, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state adl_n_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00) | CPUIDLE_FLAG_UNUSABLE, .exit_latency = 1, .target_residency = 1, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C1E", .desc = "MWAIT 0x01", .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, .exit_latency = 2, .target_residency = 4, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x20", .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 195, .target_residency = 585, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C8", .desc = "MWAIT 0x40", .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 260, .target_residency = 1040, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C10", .desc = "MWAIT 0x60", .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 660, .target_residency = 1980, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state spr_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00), .exit_latency = 1, .target_residency = 1, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C1E", .desc = "MWAIT 0x01", .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, .exit_latency = 2, .target_residency = 4, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x20", .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED | CPUIDLE_FLAG_INIT_XSTATE, .exit_latency = 290, .target_residency = 800, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state atom_cstates[] __initdata = { { .name = "C1E", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00), .exit_latency = 10, .target_residency = 20, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C2", .desc = "MWAIT 0x10", .flags = MWAIT2flg(0x10), .exit_latency = 20, .target_residency = 80, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C4", .desc = "MWAIT 0x30", .flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 100, .target_residency = 400, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x52", .flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 140, .target_residency = 560, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state tangier_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00), .exit_latency = 1, .target_residency = 4, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C4", .desc = "MWAIT 0x30", .flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 100, .target_residency = 400, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x52", .flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 140, .target_residency = 560, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C7", .desc = "MWAIT 0x60", .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 1200, .target_residency = 4000, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C9", .desc = "MWAIT 0x64", .flags = MWAIT2flg(0x64) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 10000, .target_residency = 20000, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state avn_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00), .exit_latency = 2, .target_residency = 2, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x51", .flags = MWAIT2flg(0x51) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 15, .target_residency = 45, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state knl_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00), .exit_latency = 1, .target_residency = 2, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle }, { .name = "C6", .desc = "MWAIT 0x10", .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 120, .target_residency = 500, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle }, { .enter = NULL } }; static struct cpuidle_state bxt_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00), .exit_latency = 2, .target_residency = 2, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C1E", .desc = "MWAIT 0x01", .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, .exit_latency = 10, .target_residency = 20, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x20", .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 133, .target_residency = 133, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C7s", .desc = "MWAIT 0x31", .flags = MWAIT2flg(0x31) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 155, .target_residency = 155, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C8", .desc = "MWAIT 0x40", .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 1000, .target_residency = 1000, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C9", .desc = "MWAIT 0x50", .flags = MWAIT2flg(0x50) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 2000, .target_residency = 2000, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C10", .desc = "MWAIT 0x60", .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 10000, .target_residency = 10000, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static struct cpuidle_state dnv_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00), .exit_latency = 2, .target_residency = 2, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C1E", .desc = "MWAIT 0x01", .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, .exit_latency = 10, .target_residency = 20, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x20", .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 50, .target_residency = 500, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; /* * Note, depending on HW and FW revision, SnowRidge SoC may or may not support * C6, and this is indicated in the CPUID mwait leaf. */ static struct cpuidle_state snr_cstates[] __initdata = { { .name = "C1", .desc = "MWAIT 0x00", .flags = MWAIT2flg(0x00), .exit_latency = 2, .target_residency = 2, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C1E", .desc = "MWAIT 0x01", .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE, .exit_latency = 15, .target_residency = 25, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .name = "C6", .desc = "MWAIT 0x20", .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 130, .target_residency = 500, .enter = &intel_idle, .enter_s2idle = intel_idle_s2idle, }, { .enter = NULL } }; static const struct idle_cpu idle_cpu_nehalem __initconst = { .state_table = nehalem_cstates, .auto_demotion_disable_flags = NHM_C1_AUTO_DEMOTE | NHM_C3_AUTO_DEMOTE, .disable_promotion_to_c1e = true, }; static const struct idle_cpu idle_cpu_nhx __initconst = { .state_table = nehalem_cstates, .auto_demotion_disable_flags = NHM_C1_AUTO_DEMOTE | NHM_C3_AUTO_DEMOTE, .disable_promotion_to_c1e = true, .use_acpi = true, }; static const struct idle_cpu idle_cpu_atom __initconst = { .state_table = atom_cstates, }; static const struct idle_cpu idle_cpu_tangier __initconst = { .state_table = tangier_cstates, }; static const struct idle_cpu idle_cpu_lincroft __initconst = { .state_table = atom_cstates, .auto_demotion_disable_flags = ATM_LNC_C6_AUTO_DEMOTE, }; static const struct idle_cpu idle_cpu_snb __initconst = { .state_table = snb_cstates, .disable_promotion_to_c1e = true, }; static const struct idle_cpu idle_cpu_snx __initconst = { .state_table = snb_cstates, .disable_promotion_to_c1e = true, .use_acpi = true, }; static const struct idle_cpu idle_cpu_byt __initconst = { .state_table = byt_cstates, .disable_promotion_to_c1e = true, .byt_auto_demotion_disable_flag = true, }; static const struct idle_cpu idle_cpu_cht __initconst = { .state_table = cht_cstates, .disable_promotion_to_c1e = true, .byt_auto_demotion_disable_flag = true, }; static const struct idle_cpu idle_cpu_ivb __initconst = { .state_table = ivb_cstates, .disable_promotion_to_c1e = true, }; static const struct idle_cpu idle_cpu_ivt __initconst = { .state_table = ivt_cstates, .disable_promotion_to_c1e = true, .use_acpi = true, }; static const struct idle_cpu idle_cpu_hsw __initconst = { .state_table = hsw_cstates, .disable_promotion_to_c1e = true, }; static const struct idle_cpu idle_cpu_hsx __initconst = { .state_table = hsw_cstates, .disable_promotion_to_c1e = true, .use_acpi = true, }; static const struct idle_cpu idle_cpu_bdw __initconst = { .state_table = bdw_cstates, .disable_promotion_to_c1e = true, }; static const struct idle_cpu idle_cpu_bdx __initconst = { .state_table = bdw_cstates, .disable_promotion_to_c1e = true, .use_acpi = true, }; static const struct idle_cpu idle_cpu_skl __initconst = { .state_table = skl_cstates, .disable_promotion_to_c1e = true, }; static const struct idle_cpu idle_cpu_skx __initconst = { .state_table = skx_cstates, .disable_promotion_to_c1e = true, .use_acpi = true, }; static const struct idle_cpu idle_cpu_icx __initconst = { .state_table = icx_cstates, .disable_promotion_to_c1e = true, .use_acpi = true, }; static const struct idle_cpu idle_cpu_adl __initconst = { .state_table = adl_cstates, }; static const struct idle_cpu idle_cpu_adl_l __initconst = { .state_table = adl_l_cstates, }; static const struct idle_cpu idle_cpu_adl_n __initconst = { .state_table = adl_n_cstates, }; static const struct idle_cpu idle_cpu_spr __initconst = { .state_table = spr_cstates, .disable_promotion_to_c1e = true, .use_acpi = true, }; static const struct idle_cpu idle_cpu_avn __initconst = { .state_table = avn_cstates, .disable_promotion_to_c1e = true, .use_acpi = true, }; static const struct idle_cpu idle_cpu_knl __initconst = { .state_table = knl_cstates, .use_acpi = true, }; static const struct idle_cpu idle_cpu_bxt __initconst = { .state_table = bxt_cstates, .disable_promotion_to_c1e = true, }; static const struct idle_cpu idle_cpu_dnv __initconst = { .state_table = dnv_cstates, .disable_promotion_to_c1e = true, .use_acpi = true, }; static const struct idle_cpu idle_cpu_snr __initconst = { .state_table = snr_cstates, .disable_promotion_to_c1e = true, .use_acpi = true, }; static const struct x86_cpu_id intel_idle_ids[] __initconst = { X86_MATCH_INTEL_FAM6_MODEL(NEHALEM_EP, &idle_cpu_nhx), X86_MATCH_INTEL_FAM6_MODEL(NEHALEM, &idle_cpu_nehalem), X86_MATCH_INTEL_FAM6_MODEL(NEHALEM_G, &idle_cpu_nehalem), X86_MATCH_INTEL_FAM6_MODEL(WESTMERE, &idle_cpu_nehalem), X86_MATCH_INTEL_FAM6_MODEL(WESTMERE_EP, &idle_cpu_nhx), X86_MATCH_INTEL_FAM6_MODEL(NEHALEM_EX, &idle_cpu_nhx), X86_MATCH_INTEL_FAM6_MODEL(ATOM_BONNELL, &idle_cpu_atom), X86_MATCH_INTEL_FAM6_MODEL(ATOM_BONNELL_MID, &idle_cpu_lincroft), X86_MATCH_INTEL_FAM6_MODEL(WESTMERE_EX, &idle_cpu_nhx), X86_MATCH_INTEL_FAM6_MODEL(SANDYBRIDGE, &idle_cpu_snb), X86_MATCH_INTEL_FAM6_MODEL(SANDYBRIDGE_X, &idle_cpu_snx), X86_MATCH_INTEL_FAM6_MODEL(ATOM_SALTWELL, &idle_cpu_atom), X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT, &idle_cpu_byt), X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_MID, &idle_cpu_tangier), X86_MATCH_INTEL_FAM6_MODEL(ATOM_AIRMONT, &idle_cpu_cht), X86_MATCH_INTEL_FAM6_MODEL(IVYBRIDGE, &idle_cpu_ivb), X86_MATCH_INTEL_FAM6_MODEL(IVYBRIDGE_X, &idle_cpu_ivt), X86_MATCH_INTEL_FAM6_MODEL(HASWELL, &idle_cpu_hsw), X86_MATCH_INTEL_FAM6_MODEL(HASWELL_X, &idle_cpu_hsx), X86_MATCH_INTEL_FAM6_MODEL(HASWELL_L, &idle_cpu_hsw), X86_MATCH_INTEL_FAM6_MODEL(HASWELL_G, &idle_cpu_hsw), X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_D, &idle_cpu_avn), X86_MATCH_INTEL_FAM6_MODEL(BROADWELL, &idle_cpu_bdw), X86_MATCH_INTEL_FAM6_MODEL(BROADWELL_G, &idle_cpu_bdw), X86_MATCH_INTEL_FAM6_MODEL(BROADWELL_X, &idle_cpu_bdx), X86_MATCH_INTEL_FAM6_MODEL(BROADWELL_D, &idle_cpu_bdx), X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_L, &idle_cpu_skl), X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE, &idle_cpu_skl), X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE_L, &idle_cpu_skl), X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE, &idle_cpu_skl), X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_X, &idle_cpu_skx), X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_X, &idle_cpu_icx), X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_D, &idle_cpu_icx), X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE, &idle_cpu_adl), X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE_L, &idle_cpu_adl_l), X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE_N, &idle_cpu_adl_n), X86_MATCH_INTEL_FAM6_MODEL(SAPPHIRERAPIDS_X, &idle_cpu_spr), X86_MATCH_INTEL_FAM6_MODEL(EMERALDRAPIDS_X, &idle_cpu_spr), X86_MATCH_INTEL_FAM6_MODEL(XEON_PHI_KNL, &idle_cpu_knl), X86_MATCH_INTEL_FAM6_MODEL(XEON_PHI_KNM, &idle_cpu_knl), X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT, &idle_cpu_bxt), X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT_PLUS, &idle_cpu_bxt), X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT_D, &idle_cpu_dnv), X86_MATCH_INTEL_FAM6_MODEL(ATOM_TREMONT_D, &idle_cpu_snr), {} }; static const struct x86_cpu_id intel_mwait_ids[] __initconst = { X86_MATCH_VENDOR_FAM_FEATURE(INTEL, 6, X86_FEATURE_MWAIT, NULL), {} }; static bool __init intel_idle_max_cstate_reached(int cstate) { if (cstate + 1 > max_cstate) { pr_info("max_cstate %d reached\n", max_cstate); return true; } return false; } static bool __init intel_idle_state_needs_timer_stop(struct cpuidle_state *state) { unsigned long eax = flg2MWAIT(state->flags); if (boot_cpu_has(X86_FEATURE_ARAT)) return false; /* * Switch over to one-shot tick broadcast if the target C-state * is deeper than C1. */ return !!((eax >> MWAIT_SUBSTATE_SIZE) & MWAIT_CSTATE_MASK); } #ifdef CONFIG_ACPI_PROCESSOR_CSTATE #include <acpi/processor.h> static bool no_acpi __read_mostly; module_param(no_acpi, bool, 0444); MODULE_PARM_DESC(no_acpi, "Do not use ACPI _CST for building the idle states list"); static bool force_use_acpi __read_mostly; /* No effect if no_acpi is set. */ module_param_named(use_acpi, force_use_acpi, bool, 0444); MODULE_PARM_DESC(use_acpi, "Use ACPI _CST for building the idle states list"); static struct acpi_processor_power acpi_state_table __initdata; /** * intel_idle_cst_usable - Check if the _CST information can be used. * * Check if all of the C-states listed by _CST in the max_cstate range are * ACPI_CSTATE_FFH, which means that they should be entered via MWAIT. */ static bool __init intel_idle_cst_usable(void) { int cstate, limit; limit = min_t(int, min_t(int, CPUIDLE_STATE_MAX, max_cstate + 1), acpi_state_table.count); for (cstate = 1; cstate < limit; cstate++) { struct acpi_processor_cx *cx = &acpi_state_table.states[cstate]; if (cx->entry_method != ACPI_CSTATE_FFH) return false; } return true; } static bool __init intel_idle_acpi_cst_extract(void) { unsigned int cpu; if (no_acpi) { pr_debug("Not allowed to use ACPI _CST\n"); return false; } for_each_possible_cpu(cpu) { struct acpi_processor *pr = per_cpu(processors, cpu); if (!pr) continue; if (acpi_processor_evaluate_cst(pr->handle, cpu, &acpi_state_table)) continue; acpi_state_table.count++; if (!intel_idle_cst_usable()) continue; if (!acpi_processor_claim_cst_control()) break; return true; } acpi_state_table.count = 0; pr_debug("ACPI _CST not found or not usable\n"); return false; } static void __init intel_idle_init_cstates_acpi(struct cpuidle_driver *drv) { int cstate, limit = min_t(int, CPUIDLE_STATE_MAX, acpi_state_table.count); /* * If limit > 0, intel_idle_cst_usable() has returned 'true', so all of * the interesting states are ACPI_CSTATE_FFH. */ for (cstate = 1; cstate < limit; cstate++) { struct acpi_processor_cx *cx; struct cpuidle_state *state; if (intel_idle_max_cstate_reached(cstate - 1)) break; cx = &acpi_state_table.states[cstate]; state = &drv->states[drv->state_count++]; snprintf(state->name, CPUIDLE_NAME_LEN, "C%d_ACPI", cstate); strscpy(state->desc, cx->desc, CPUIDLE_DESC_LEN); state->exit_latency = cx->latency; /* * For C1-type C-states use the same number for both the exit * latency and target residency, because that is the case for * C1 in the majority of the static C-states tables above. * For the other types of C-states, however, set the target * residency to 3 times the exit latency which should lead to * a reasonable balance between energy-efficiency and * performance in the majority of interesting cases. */ state->target_residency = cx->latency; if (cx->type > ACPI_STATE_C1) state->target_residency *= 3; state->flags = MWAIT2flg(cx->address); if (cx->type > ACPI_STATE_C2) state->flags |= CPUIDLE_FLAG_TLB_FLUSHED; if (disabled_states_mask & BIT(cstate)) state->flags |= CPUIDLE_FLAG_OFF; if (intel_idle_state_needs_timer_stop(state)) state->flags |= CPUIDLE_FLAG_TIMER_STOP; state->enter = intel_idle; state->enter_s2idle = intel_idle_s2idle; } } static bool __init intel_idle_off_by_default(u32 mwait_hint) { int cstate, limit; /* * If there are no _CST C-states, do not disable any C-states by * default. */ if (!acpi_state_table.count) return false; limit = min_t(int, CPUIDLE_STATE_MAX, acpi_state_table.count); /* * If limit > 0, intel_idle_cst_usable() has returned 'true', so all of * the interesting states are ACPI_CSTATE_FFH. */ for (cstate = 1; cstate < limit; cstate++) { if (acpi_state_table.states[cstate].address == mwait_hint) return false; } return true; } #else /* !CONFIG_ACPI_PROCESSOR_CSTATE */ #define force_use_acpi (false) static inline bool intel_idle_acpi_cst_extract(void) { return false; } static inline void intel_idle_init_cstates_acpi(struct cpuidle_driver *drv) { } static inline bool intel_idle_off_by_default(u32 mwait_hint) { return false; } #endif /* !CONFIG_ACPI_PROCESSOR_CSTATE */ /** * ivt_idle_state_table_update - Tune the idle states table for Ivy Town. * * Tune IVT multi-socket targets. * Assumption: num_sockets == (max_package_num + 1). */ static void __init ivt_idle_state_table_update(void) { /* IVT uses a different table for 1-2, 3-4, and > 4 sockets */ int cpu, package_num, num_sockets = 1; for_each_online_cpu(cpu) { package_num = topology_physical_package_id(cpu); if (package_num + 1 > num_sockets) { num_sockets = package_num + 1; if (num_sockets > 4) { cpuidle_state_table = ivt_cstates_8s; return; } } } if (num_sockets > 2) cpuidle_state_table = ivt_cstates_4s; /* else, 1 and 2 socket systems use default ivt_cstates */ } /** * irtl_2_usec - IRTL to microseconds conversion. * @irtl: IRTL MSR value. * * Translate the IRTL (Interrupt Response Time Limit) MSR value to microseconds. */ static unsigned long long __init irtl_2_usec(unsigned long long irtl) { static const unsigned int irtl_ns_units[] __initconst = { 1, 32, 1024, 32768, 1048576, 33554432, 0, 0 }; unsigned long long ns; if (!irtl) return 0; ns = irtl_ns_units[(irtl >> 10) & 0x7]; return div_u64((irtl & 0x3FF) * ns, NSEC_PER_USEC); } /** * bxt_idle_state_table_update - Fix up the Broxton idle states table. * * On BXT, trust the IRTL (Interrupt Response Time Limit) MSR to show the * definitive maximum latency and use the same value for target_residency. */ static void __init bxt_idle_state_table_update(void) { unsigned long long msr; unsigned int usec; rdmsrl(MSR_PKGC6_IRTL, msr); usec = irtl_2_usec(msr); if (usec) { bxt_cstates[2].exit_latency = usec; bxt_cstates[2].target_residency = usec; } rdmsrl(MSR_PKGC7_IRTL, msr); usec = irtl_2_usec(msr); if (usec) { bxt_cstates[3].exit_latency = usec; bxt_cstates[3].target_residency = usec; } rdmsrl(MSR_PKGC8_IRTL, msr); usec = irtl_2_usec(msr); if (usec) { bxt_cstates[4].exit_latency = usec; bxt_cstates[4].target_residency = usec; } rdmsrl(MSR_PKGC9_IRTL, msr); usec = irtl_2_usec(msr); if (usec) { bxt_cstates[5].exit_latency = usec; bxt_cstates[5].target_residency = usec; } rdmsrl(MSR_PKGC10_IRTL, msr); usec = irtl_2_usec(msr); if (usec) { bxt_cstates[6].exit_latency = usec; bxt_cstates[6].target_residency = usec; } } /** * sklh_idle_state_table_update - Fix up the Sky Lake idle states table. * * On SKL-H (model 0x5e) skip C8 and C9 if C10 is enabled and SGX disabled. */ static void __init sklh_idle_state_table_update(void) { unsigned long long msr; unsigned int eax, ebx, ecx, edx; /* if PC10 disabled via cmdline intel_idle.max_cstate=7 or shallower */ if (max_cstate <= 7) return; /* if PC10 not present in CPUID.MWAIT.EDX */ if ((mwait_substates & (0xF << 28)) == 0) return; rdmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr); /* PC10 is not enabled in PKG C-state limit */ if ((msr & 0xF) != 8) return; ecx = 0; cpuid(7, &eax, &ebx, &ecx, &edx); /* if SGX is present */ if (ebx & (1 << 2)) { rdmsrl(MSR_IA32_FEAT_CTL, msr); /* if SGX is enabled */ if (msr & (1 << 18)) return; } skl_cstates[5].flags |= CPUIDLE_FLAG_UNUSABLE; /* C8-SKL */ skl_cstates[6].flags |= CPUIDLE_FLAG_UNUSABLE; /* C9-SKL */ } /** * skx_idle_state_table_update - Adjust the Sky Lake/Cascade Lake * idle states table. */ static void __init skx_idle_state_table_update(void) { unsigned long long msr; rdmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr); /* * 000b: C0/C1 (no package C-state support) * 001b: C2 * 010b: C6 (non-retention) * 011b: C6 (retention) * 111b: No Package C state limits. */ if ((msr & 0x7) < 2) { /* * Uses the CC6 + PC0 latency and 3 times of * latency for target_residency if the PC6 * is disabled in BIOS. This is consistent * with how intel_idle driver uses _CST * to set the target_residency. */ skx_cstates[2].exit_latency = 92; skx_cstates[2].target_residency = 276; } } /** * adl_idle_state_table_update - Adjust AlderLake idle states table. */ static void __init adl_idle_state_table_update(void) { /* Check if user prefers C1 over C1E. */ if (preferred_states_mask & BIT(1) && !(preferred_states_mask & BIT(2))) { cpuidle_state_table[0].flags &= ~CPUIDLE_FLAG_UNUSABLE; cpuidle_state_table[1].flags |= CPUIDLE_FLAG_UNUSABLE; /* Disable C1E by clearing the "C1E promotion" bit. */ c1e_promotion = C1E_PROMOTION_DISABLE; return; } /* Make sure C1E is enabled by default */ c1e_promotion = C1E_PROMOTION_ENABLE; } /** * spr_idle_state_table_update - Adjust Sapphire Rapids idle states table. */ static void __init spr_idle_state_table_update(void) { unsigned long long msr; /* * By default, the C6 state assumes the worst-case scenario of package * C6. However, if PC6 is disabled, we update the numbers to match * core C6. */ rdmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr); /* Limit value 2 and above allow for PC6. */ if ((msr & 0x7) < 2) { spr_cstates[2].exit_latency = 190; spr_cstates[2].target_residency = 600; } } static bool __init intel_idle_verify_cstate(unsigned int mwait_hint) { unsigned int mwait_cstate = MWAIT_HINT2CSTATE(mwait_hint) + 1; unsigned int num_substates = (mwait_substates >> mwait_cstate * 4) & MWAIT_SUBSTATE_MASK; /* Ignore the C-state if there are NO sub-states in CPUID for it. */ if (num_substates == 0) return false; if (mwait_cstate > 2 && !boot_cpu_has(X86_FEATURE_NONSTOP_TSC)) mark_tsc_unstable("TSC halts in idle states deeper than C2"); return true; } static void state_update_enter_method(struct cpuidle_state *state, int cstate) { if (state->flags & CPUIDLE_FLAG_INIT_XSTATE) { /* * Combining with XSTATE with IBRS or IRQ_ENABLE flags * is not currently supported but this driver. */ WARN_ON_ONCE(state->flags & CPUIDLE_FLAG_IBRS); WARN_ON_ONCE(state->flags & CPUIDLE_FLAG_IRQ_ENABLE); state->enter = intel_idle_xstate; return; } if (cpu_feature_enabled(X86_FEATURE_KERNEL_IBRS) && state->flags & CPUIDLE_FLAG_IBRS) { /* * IBRS mitigation requires that C-states are entered * with interrupts disabled. */ WARN_ON_ONCE(state->flags & CPUIDLE_FLAG_IRQ_ENABLE); state->enter = intel_idle_ibrs; return; } if (state->flags & CPUIDLE_FLAG_IRQ_ENABLE) { state->enter = intel_idle_irq; return; } if (force_irq_on) { pr_info("forced intel_idle_irq for state %d\n", cstate); state->enter = intel_idle_irq; } } static void __init intel_idle_init_cstates_icpu(struct cpuidle_driver *drv) { int cstate; switch (boot_cpu_data.x86_model) { case INTEL_FAM6_IVYBRIDGE_X: ivt_idle_state_table_update(); break; case INTEL_FAM6_ATOM_GOLDMONT: case INTEL_FAM6_ATOM_GOLDMONT_PLUS: bxt_idle_state_table_update(); break; case INTEL_FAM6_SKYLAKE: sklh_idle_state_table_update(); break; case INTEL_FAM6_SKYLAKE_X: skx_idle_state_table_update(); break; case INTEL_FAM6_SAPPHIRERAPIDS_X: case INTEL_FAM6_EMERALDRAPIDS_X: spr_idle_state_table_update(); break; case INTEL_FAM6_ALDERLAKE: case INTEL_FAM6_ALDERLAKE_L: case INTEL_FAM6_ALDERLAKE_N: adl_idle_state_table_update(); break; } for (cstate = 0; cstate < CPUIDLE_STATE_MAX; ++cstate) { struct cpuidle_state *state; unsigned int mwait_hint; if (intel_idle_max_cstate_reached(cstate)) break; if (!cpuidle_state_table[cstate].enter && !cpuidle_state_table[cstate].enter_s2idle) break; /* If marked as unusable, skip this state. */ if (cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_UNUSABLE) { pr_debug("state %s is disabled\n", cpuidle_state_table[cstate].name); continue; } mwait_hint = flg2MWAIT(cpuidle_state_table[cstate].flags); if (!intel_idle_verify_cstate(mwait_hint)) continue; /* Structure copy. */ drv->states[drv->state_count] = cpuidle_state_table[cstate]; state = &drv->states[drv->state_count]; state_update_enter_method(state, cstate); if ((disabled_states_mask & BIT(drv->state_count)) || ((icpu->use_acpi || force_use_acpi) && intel_idle_off_by_default(mwait_hint) && !(state->flags & CPUIDLE_FLAG_ALWAYS_ENABLE))) state->flags |= CPUIDLE_FLAG_OFF; if (intel_idle_state_needs_timer_stop(state)) state->flags |= CPUIDLE_FLAG_TIMER_STOP; drv->state_count++; } if (icpu->byt_auto_demotion_disable_flag) { wrmsrl(MSR_CC6_DEMOTION_POLICY_CONFIG, 0); wrmsrl(MSR_MC6_DEMOTION_POLICY_CONFIG, 0); } } /** * intel_idle_cpuidle_driver_init - Create the list of available idle states. * @drv: cpuidle driver structure to initialize. */ static void __init intel_idle_cpuidle_driver_init(struct cpuidle_driver *drv) { cpuidle_poll_state_init(drv); if (disabled_states_mask & BIT(0)) drv->states[0].flags |= CPUIDLE_FLAG_OFF; drv->state_count = 1; if (icpu) intel_idle_init_cstates_icpu(drv); else intel_idle_init_cstates_acpi(drv); } static void auto_demotion_disable(void) { unsigned long long msr_bits; rdmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr_bits); msr_bits &= ~auto_demotion_disable_flags; wrmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr_bits); } static void c1e_promotion_enable(void) { unsigned long long msr_bits; rdmsrl(MSR_IA32_POWER_CTL, msr_bits); msr_bits |= 0x2; wrmsrl(MSR_IA32_POWER_CTL, msr_bits); } static void c1e_promotion_disable(void) { unsigned long long msr_bits; rdmsrl(MSR_IA32_POWER_CTL, msr_bits); msr_bits &= ~0x2; wrmsrl(MSR_IA32_POWER_CTL, msr_bits); } /** * intel_idle_cpu_init - Register the target CPU with the cpuidle core. * @cpu: CPU to initialize. * * Register a cpuidle device object for @cpu and update its MSRs in accordance * with the processor model flags. */ static int intel_idle_cpu_init(unsigned int cpu) { struct cpuidle_device *dev; dev = per_cpu_ptr(intel_idle_cpuidle_devices, cpu); dev->cpu = cpu; if (cpuidle_register_device(dev)) { pr_debug("cpuidle_register_device %d failed!\n", cpu); return -EIO; } if (auto_demotion_disable_flags) auto_demotion_disable(); if (c1e_promotion == C1E_PROMOTION_ENABLE) c1e_promotion_enable(); else if (c1e_promotion == C1E_PROMOTION_DISABLE) c1e_promotion_disable(); return 0; } static int intel_idle_cpu_online(unsigned int cpu) { struct cpuidle_device *dev; if (!boot_cpu_has(X86_FEATURE_ARAT)) tick_broadcast_enable(); /* * Some systems can hotplug a cpu at runtime after * the kernel has booted, we have to initialize the * driver in this case */ dev = per_cpu_ptr(intel_idle_cpuidle_devices, cpu); if (!dev->registered) return intel_idle_cpu_init(cpu); return 0; } /** * intel_idle_cpuidle_devices_uninit - Unregister all cpuidle devices. */ static void __init intel_idle_cpuidle_devices_uninit(void) { int i; for_each_online_cpu(i) cpuidle_unregister_device(per_cpu_ptr(intel_idle_cpuidle_devices, i)); } static int __init intel_idle_init(void) { const struct x86_cpu_id *id; unsigned int eax, ebx, ecx; int retval; /* Do not load intel_idle at all for now if idle= is passed */ if (boot_option_idle_override != IDLE_NO_OVERRIDE) return -ENODEV; if (max_cstate == 0) { pr_debug("disabled\n"); return -EPERM; } id = x86_match_cpu(intel_idle_ids); if (id) { if (!boot_cpu_has(X86_FEATURE_MWAIT)) { pr_debug("Please enable MWAIT in BIOS SETUP\n"); return -ENODEV; } } else { id = x86_match_cpu(intel_mwait_ids); if (!id) return -ENODEV; } if (boot_cpu_data.cpuid_level < CPUID_MWAIT_LEAF) return -ENODEV; cpuid(CPUID_MWAIT_LEAF, &eax, &ebx, &ecx, &mwait_substates); if (!(ecx & CPUID5_ECX_EXTENSIONS_SUPPORTED) || !(ecx & CPUID5_ECX_INTERRUPT_BREAK) || !mwait_substates) return -ENODEV; pr_debug("MWAIT substates: 0x%x\n", mwait_substates); icpu = (const struct idle_cpu *)id->driver_data; if (icpu) { cpuidle_state_table = icpu->state_table; auto_demotion_disable_flags = icpu->auto_demotion_disable_flags; if (icpu->disable_promotion_to_c1e) c1e_promotion = C1E_PROMOTION_DISABLE; if (icpu->use_acpi || force_use_acpi) intel_idle_acpi_cst_extract(); } else if (!intel_idle_acpi_cst_extract()) { return -ENODEV; } pr_debug("v" INTEL_IDLE_VERSION " model 0x%X\n", boot_cpu_data.x86_model); intel_idle_cpuidle_devices = alloc_percpu(struct cpuidle_device); if (!intel_idle_cpuidle_devices) return -ENOMEM; intel_idle_cpuidle_driver_init(&intel_idle_driver); retval = cpuidle_register_driver(&intel_idle_driver); if (retval) { struct cpuidle_driver *drv = cpuidle_get_driver(); printk(KERN_DEBUG pr_fmt("intel_idle yielding to %s\n"), drv ? drv->name : "none"); goto init_driver_fail; } retval = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "idle/intel:online", intel_idle_cpu_online, NULL); if (retval < 0) goto hp_setup_fail; pr_debug("Local APIC timer is reliable in %s\n", boot_cpu_has(X86_FEATURE_ARAT) ? "all C-states" : "C1"); return 0; hp_setup_fail: intel_idle_cpuidle_devices_uninit(); cpuidle_unregister_driver(&intel_idle_driver); init_driver_fail: free_percpu(intel_idle_cpuidle_devices); return retval; } device_initcall(intel_idle_init); /* * We are not really modular, but we used to support that. Meaning we also * support "intel_idle.max_cstate=..." at boot and also a read-only export of * it at /sys/module/intel_idle/parameters/max_cstate -- so using module_param * is the easiest way (currently) to continue doing that. */ module_param(max_cstate, int, 0444); /* * The positions of the bits that are set in this number are the indices of the * idle states to be disabled by default (as reflected by the names of the * corresponding idle state directories in sysfs, "state0", "state1" ... * "state<i>" ..., where <i> is the index of the given state). */ module_param_named(states_off, disabled_states_mask, uint, 0444); MODULE_PARM_DESC(states_off, "Mask of disabled idle states"); /* * Some platforms come with mutually exclusive C-states, so that if one is * enabled, the other C-states must not be used. Example: C1 and C1E on * Sapphire Rapids platform. This parameter allows for selecting the * preferred C-states among the groups of mutually exclusive C-states - the * selected C-states will be registered, the other C-states from the mutually * exclusive group won't be registered. If the platform has no mutually * exclusive C-states, this parameter has no effect. */ module_param_named(preferred_cstates, preferred_states_mask, uint, 0444); MODULE_PARM_DESC(preferred_cstates, "Mask of preferred idle states"); /* * Debugging option that forces the driver to enter all C-states with * interrupts enabled. Does not apply to C-states with * 'CPUIDLE_FLAG_INIT_XSTATE' and 'CPUIDLE_FLAG_IBRS' flags. */ module_param(force_irq_on, bool, 0444);
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