/drivers/idle/intel_idle.c
http://github.com/mirrors/linux · C · 1695 lines · 1331 code · 178 blank · 186 comment · 80 complexity · 7418e14309f87367c81f21d4387d3d8a MD5 · raw file
- // 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 specific Intel processors
- * 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-stats
- */
- /*
- * 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/notifier.h>
- #include <linux/cpu.h>
- #include <linux/moduleparam.h>
- #include <asm/cpu_device_id.h>
- #include <asm/intel-family.h>
- #include <asm/mwait.h>
- #include <asm/msr.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;
- static struct cpuidle_device __percpu *intel_idle_cpuidle_devices;
- static unsigned long auto_demotion_disable_flags;
- static bool disable_promotion_to_c1e;
- static bool lapic_timer_always_reliable;
- 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 this state by default even if the ACPI _CST does not list it.
- */
- #define CPUIDLE_FLAG_ALWAYS_ENABLE BIT(15)
- /*
- * Set this flag for states where the HW flushes the TLB for us
- * and so we don't need cross-calls to keep it consistent.
- * If this flag is set, SW flushes the TLB, so even if the
- * HW doesn't do the flushing, this flag is safe to use.
- */
- #define CPUIDLE_FLAG_TLB_FLUSHED BIT(16)
- /*
- * 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)
- /**
- * 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.
- *
- * Optionally call leave_mm() for the target CPU upfront to avoid wakeups due to
- * flushing user TLBs.
- *
- * Must be called under local_irq_disable().
- */
- static __cpuidle 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 */
- bool uninitialized_var(tick);
- int cpu = smp_processor_id();
- /*
- * leave_mm() to avoid costly and often unnecessary wakeups
- * for flushing the user TLB's associated with the active mm.
- */
- if (state->flags & CPUIDLE_FLAG_TLB_FLUSHED)
- leave_mm(cpu);
- if (!static_cpu_has(X86_FEATURE_ARAT) && !lapic_timer_always_reliable) {
- /*
- * Switch over to one-shot tick broadcast if the target C-state
- * is deeper than C1.
- */
- if ((eax >> MWAIT_SUBSTATE_SIZE) & MWAIT_CSTATE_MASK) {
- tick = true;
- tick_broadcast_enter();
- } else {
- tick = false;
- }
- }
- mwait_idle_with_hints(eax, ecx);
- if (!static_cpu_has(X86_FEATURE_ARAT) && tick)
- tick_broadcast_exit();
- return 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 void intel_idle_s2idle(struct cpuidle_device *dev,
- struct cpuidle_driver *drv, int index)
- {
- unsigned long eax = flg2MWAIT(drv->states[index].flags);
- unsigned long ecx = 1; /* break on interrupt flag */
- mwait_idle_with_hints(eax, ecx);
- }
- /*
- * 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,
- .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,
- .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,
- .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,
- .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,
- .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),
- .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 = 600,
- .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 }
- };
- 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_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 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(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_dnv),
- {}
- };
- 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;
- }
- #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()) {
- acpi_state_table.count = 0;
- return false;
- }
- return true;
- }
- 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))
- break;
- cx = &acpi_state_table.states[cstate];
- state = &drv->states[drv->state_count++];
- snprintf(state->name, CPUIDLE_NAME_LEN, "C%d_ACPI", cstate);
- strlcpy(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;
- 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 */
- }
- 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 __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;
- }
- for (cstate = 0; cstate < CPUIDLE_STATE_MAX; ++cstate) {
- 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];
- if ((disabled_states_mask & BIT(drv->state_count)) ||
- ((icpu->use_acpi || force_use_acpi) &&
- intel_idle_off_by_default(mwait_hint) &&
- !(cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_ALWAYS_ENABLE)))
- drv->states[drv->state_count].flags |= CPUIDLE_FLAG_OFF;
- 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_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 (disable_promotion_to_c1e)
- c1e_promotion_disable();
- return 0;
- }
- static int intel_idle_cpu_online(unsigned int cpu)
- {
- struct cpuidle_device *dev;
- if (!lapic_timer_always_reliable)
- 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;
- disable_promotion_to_c1e = icpu->disable_promotion_to_c1e;
- 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;
- }
- if (boot_cpu_has(X86_FEATURE_ARAT)) /* Always Reliable APIC Timer */
- lapic_timer_always_reliable = true;
- 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",
- lapic_timer_always_reliable ? "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");