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1490 lines
36 KiB
1490 lines
36 KiB
/*
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* intel_idle.c - native hardware idle loop for modern Intel processors
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*
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* Copyright (c) 2013, Intel Corporation.
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* Len Brown <len.brown@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* intel_idle is a cpuidle driver that loads on specific Intel processors
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* in lieu of the legacy ACPI processor_idle driver. The intent is to
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* make Linux more efficient on these processors, as intel_idle knows
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* more than ACPI, as well as make Linux more immune to ACPI BIOS bugs.
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*/
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/*
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* Design Assumptions
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*
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* All CPUs have same idle states as boot CPU
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*
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* Chipset BM_STS (bus master status) bit is a NOP
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* for preventing entry into deep C-stats
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*/
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/*
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* Known limitations
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*
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* The driver currently initializes for_each_online_cpu() upon modprobe.
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* It it unaware of subsequent processors hot-added to the system.
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* This means that if you boot with maxcpus=n and later online
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* processors above n, those processors will use C1 only.
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*
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* ACPI has a .suspend hack to turn off deep c-statees during suspend
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* to avoid complications with the lapic timer workaround.
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* Have not seen issues with suspend, but may need same workaround here.
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*
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*/
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/* un-comment DEBUG to enable pr_debug() statements */
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#define DEBUG
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/cpuidle.h>
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#include <linux/tick.h>
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#include <trace/events/power.h>
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#include <linux/sched.h>
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#include <linux/notifier.h>
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#include <linux/cpu.h>
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#include <linux/moduleparam.h>
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#include <asm/cpu_device_id.h>
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#include <asm/intel-family.h>
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#include <asm/mwait.h>
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#include <asm/msr.h>
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#define INTEL_IDLE_VERSION "0.4.1"
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static struct cpuidle_driver intel_idle_driver = {
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.name = "intel_idle",
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.owner = THIS_MODULE,
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};
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/* intel_idle.max_cstate=0 disables driver */
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static int max_cstate = CPUIDLE_STATE_MAX - 1;
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static unsigned int mwait_substates;
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#define LAPIC_TIMER_ALWAYS_RELIABLE 0xFFFFFFFF
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/* Reliable LAPIC Timer States, bit 1 for C1 etc. */
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static unsigned int lapic_timer_reliable_states = (1 << 1); /* Default to only C1 */
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struct idle_cpu {
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struct cpuidle_state *state_table;
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/*
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* Hardware C-state auto-demotion may not always be optimal.
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* Indicate which enable bits to clear here.
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*/
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unsigned long auto_demotion_disable_flags;
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bool byt_auto_demotion_disable_flag;
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bool disable_promotion_to_c1e;
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};
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static const struct idle_cpu *icpu;
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static struct cpuidle_device __percpu *intel_idle_cpuidle_devices;
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static int intel_idle(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index);
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static void intel_idle_s2idle(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index);
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static struct cpuidle_state *cpuidle_state_table;
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/*
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* Set this flag for states where the HW flushes the TLB for us
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* and so we don't need cross-calls to keep it consistent.
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* If this flag is set, SW flushes the TLB, so even if the
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* HW doesn't do the flushing, this flag is safe to use.
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*/
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#define CPUIDLE_FLAG_TLB_FLUSHED 0x10000
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/*
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* MWAIT takes an 8-bit "hint" in EAX "suggesting"
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* the C-state (top nibble) and sub-state (bottom nibble)
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* 0x00 means "MWAIT(C1)", 0x10 means "MWAIT(C2)" etc.
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*
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* We store the hint at the top of our "flags" for each state.
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*/
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#define flg2MWAIT(flags) (((flags) >> 24) & 0xFF)
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#define MWAIT2flg(eax) ((eax & 0xFF) << 24)
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/*
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* States are indexed by the cstate number,
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* which is also the index into the MWAIT hint array.
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* Thus C0 is a dummy.
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*/
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static struct cpuidle_state nehalem_cstates[] = {
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{
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.name = "C1",
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.desc = "MWAIT 0x00",
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.flags = MWAIT2flg(0x00),
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.exit_latency = 3,
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.target_residency = 6,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C1E",
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.desc = "MWAIT 0x01",
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.flags = MWAIT2flg(0x01),
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.exit_latency = 10,
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.target_residency = 20,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C3",
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.desc = "MWAIT 0x10",
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.flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
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.exit_latency = 20,
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.target_residency = 80,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C6",
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.desc = "MWAIT 0x20",
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.flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
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.exit_latency = 200,
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.target_residency = 800,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.enter = NULL }
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};
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static struct cpuidle_state snb_cstates[] = {
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{
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.name = "C1",
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.desc = "MWAIT 0x00",
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.flags = MWAIT2flg(0x00),
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.exit_latency = 2,
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.target_residency = 2,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C1E",
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.desc = "MWAIT 0x01",
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.flags = MWAIT2flg(0x01),
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.exit_latency = 10,
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.target_residency = 20,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C3",
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.desc = "MWAIT 0x10",
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.flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
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.exit_latency = 80,
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.target_residency = 211,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C6",
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.desc = "MWAIT 0x20",
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.flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
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.exit_latency = 104,
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.target_residency = 345,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C7",
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.desc = "MWAIT 0x30",
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.flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED,
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.exit_latency = 109,
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.target_residency = 345,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.enter = NULL }
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};
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static struct cpuidle_state byt_cstates[] = {
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{
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.name = "C1",
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.desc = "MWAIT 0x00",
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.flags = MWAIT2flg(0x00),
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.exit_latency = 1,
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.target_residency = 1,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C6N",
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.desc = "MWAIT 0x58",
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.flags = MWAIT2flg(0x58) | CPUIDLE_FLAG_TLB_FLUSHED,
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.exit_latency = 300,
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.target_residency = 275,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C6S",
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.desc = "MWAIT 0x52",
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.flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED,
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.exit_latency = 500,
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.target_residency = 560,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C7",
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.desc = "MWAIT 0x60",
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.flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,
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.exit_latency = 1200,
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.target_residency = 4000,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C7S",
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.desc = "MWAIT 0x64",
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.flags = MWAIT2flg(0x64) | CPUIDLE_FLAG_TLB_FLUSHED,
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.exit_latency = 10000,
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.target_residency = 20000,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.enter = NULL }
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};
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static struct cpuidle_state cht_cstates[] = {
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{
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.name = "C1",
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.desc = "MWAIT 0x00",
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.flags = MWAIT2flg(0x00),
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.exit_latency = 1,
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.target_residency = 1,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C6N",
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.desc = "MWAIT 0x58",
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.flags = MWAIT2flg(0x58) | CPUIDLE_FLAG_TLB_FLUSHED,
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.exit_latency = 80,
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.target_residency = 275,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C6S",
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.desc = "MWAIT 0x52",
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.flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED,
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.exit_latency = 200,
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.target_residency = 560,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C7",
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.desc = "MWAIT 0x60",
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.flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,
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.exit_latency = 1200,
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.target_residency = 4000,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C7S",
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.desc = "MWAIT 0x64",
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.flags = MWAIT2flg(0x64) | CPUIDLE_FLAG_TLB_FLUSHED,
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.exit_latency = 10000,
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.target_residency = 20000,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.enter = NULL }
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};
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static struct cpuidle_state ivb_cstates[] = {
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{
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.name = "C1",
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.desc = "MWAIT 0x00",
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.flags = MWAIT2flg(0x00),
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.exit_latency = 1,
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.target_residency = 1,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C1E",
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.desc = "MWAIT 0x01",
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.flags = MWAIT2flg(0x01),
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.exit_latency = 10,
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.target_residency = 20,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C3",
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.desc = "MWAIT 0x10",
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.flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
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.exit_latency = 59,
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.target_residency = 156,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C6",
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.desc = "MWAIT 0x20",
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.flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
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.exit_latency = 80,
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.target_residency = 300,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C7",
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.desc = "MWAIT 0x30",
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.flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED,
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.exit_latency = 87,
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.target_residency = 300,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.enter = NULL }
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};
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static struct cpuidle_state ivt_cstates[] = {
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{
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.name = "C1",
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.desc = "MWAIT 0x00",
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.flags = MWAIT2flg(0x00),
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.exit_latency = 1,
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.target_residency = 1,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C1E",
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.desc = "MWAIT 0x01",
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.flags = MWAIT2flg(0x01),
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.exit_latency = 10,
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.target_residency = 80,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C3",
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.desc = "MWAIT 0x10",
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.flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
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.exit_latency = 59,
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.target_residency = 156,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C6",
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.desc = "MWAIT 0x20",
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.flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
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.exit_latency = 82,
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.target_residency = 300,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.enter = NULL }
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};
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|
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static struct cpuidle_state ivt_cstates_4s[] = {
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{
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.name = "C1",
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.desc = "MWAIT 0x00",
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.flags = MWAIT2flg(0x00),
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.exit_latency = 1,
|
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.target_residency = 1,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
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{
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.name = "C1E",
|
|
.desc = "MWAIT 0x01",
|
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.flags = MWAIT2flg(0x01),
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.exit_latency = 10,
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.target_residency = 250,
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.enter = &intel_idle,
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.enter_s2idle = intel_idle_s2idle, },
|
|
{
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|
.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,
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.exit_latency = 84,
|
|
.target_residency = 400,
|
|
.enter = &intel_idle,
|
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.enter_s2idle = intel_idle_s2idle, },
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{
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.enter = NULL }
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};
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|
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static struct cpuidle_state ivt_cstates_8s[] = {
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|
{
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.name = "C1",
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.desc = "MWAIT 0x00",
|
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.flags = MWAIT2flg(0x00),
|
|
.exit_latency = 1,
|
|
.target_residency = 1,
|
|
.enter = &intel_idle,
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|
.enter_s2idle = intel_idle_s2idle, },
|
|
{
|
|
.name = "C1E",
|
|
.desc = "MWAIT 0x01",
|
|
.flags = MWAIT2flg(0x01),
|
|
.exit_latency = 10,
|
|
.target_residency = 500,
|
|
.enter = &intel_idle,
|
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.enter_s2idle = intel_idle_s2idle, },
|
|
{
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.name = "C3",
|
|
.desc = "MWAIT 0x10",
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.flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
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|
.exit_latency = 59,
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|
.target_residency = 600,
|
|
.enter = &intel_idle,
|
|
.enter_s2idle = intel_idle_s2idle, },
|
|
{
|
|
.name = "C6",
|
|
.desc = "MWAIT 0x20",
|
|
.flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
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|
.exit_latency = 88,
|
|
.target_residency = 700,
|
|
.enter = &intel_idle,
|
|
.enter_s2idle = intel_idle_s2idle, },
|
|
{
|
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.enter = NULL }
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|
};
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|
|
static struct cpuidle_state hsw_cstates[] = {
|
|
{
|
|
.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),
|
|
.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[] = {
|
|
{
|
|
.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),
|
|
.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[] = {
|
|
{
|
|
.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),
|
|
.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[] = {
|
|
{
|
|
.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),
|
|
.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[] = {
|
|
{
|
|
.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[] = {
|
|
{
|
|
.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[] = {
|
|
{
|
|
.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[] = {
|
|
{
|
|
.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[] = {
|
|
{
|
|
.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),
|
|
.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[] = {
|
|
{
|
|
.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),
|
|
.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 }
|
|
};
|
|
|
|
/**
|
|
* intel_idle
|
|
* @dev: cpuidle_device
|
|
* @drv: cpuidle driver
|
|
* @index: index of cpuidle state
|
|
*
|
|
* Must be called under local_irq_disable().
|
|
*/
|
|
static __cpuidle int intel_idle(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);
|
|
unsigned int cstate;
|
|
int cpu = smp_processor_id();
|
|
|
|
cstate = (((eax) >> MWAIT_SUBSTATE_SIZE) & MWAIT_CSTATE_MASK) + 1;
|
|
|
|
/*
|
|
* 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 (!(lapic_timer_reliable_states & (1 << (cstate))))
|
|
tick_broadcast_enter();
|
|
|
|
mwait_idle_with_hints(eax, ecx);
|
|
|
|
if (!(lapic_timer_reliable_states & (1 << (cstate))))
|
|
tick_broadcast_exit();
|
|
|
|
return index;
|
|
}
|
|
|
|
/**
|
|
* intel_idle_s2idle - simplified "enter" callback routine for suspend-to-idle
|
|
* @dev: cpuidle_device
|
|
* @drv: cpuidle driver
|
|
* @index: state index
|
|
*/
|
|
static void intel_idle_s2idle(struct cpuidle_device *dev,
|
|
struct cpuidle_driver *drv, int index)
|
|
{
|
|
unsigned long ecx = 1; /* break on interrupt flag */
|
|
unsigned long eax = flg2MWAIT(drv->states[index].flags);
|
|
|
|
mwait_idle_with_hints(eax, ecx);
|
|
}
|
|
|
|
static void __setup_broadcast_timer(bool on)
|
|
{
|
|
if (on)
|
|
tick_broadcast_enable();
|
|
else
|
|
tick_broadcast_disable();
|
|
}
|
|
|
|
static void auto_demotion_disable(void)
|
|
{
|
|
unsigned long long msr_bits;
|
|
|
|
rdmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr_bits);
|
|
msr_bits &= ~(icpu->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);
|
|
}
|
|
|
|
static const struct idle_cpu idle_cpu_nehalem = {
|
|
.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_atom = {
|
|
.state_table = atom_cstates,
|
|
};
|
|
|
|
static const struct idle_cpu idle_cpu_tangier = {
|
|
.state_table = tangier_cstates,
|
|
};
|
|
|
|
static const struct idle_cpu idle_cpu_lincroft = {
|
|
.state_table = atom_cstates,
|
|
.auto_demotion_disable_flags = ATM_LNC_C6_AUTO_DEMOTE,
|
|
};
|
|
|
|
static const struct idle_cpu idle_cpu_snb = {
|
|
.state_table = snb_cstates,
|
|
.disable_promotion_to_c1e = true,
|
|
};
|
|
|
|
static const struct idle_cpu idle_cpu_byt = {
|
|
.state_table = byt_cstates,
|
|
.disable_promotion_to_c1e = true,
|
|
.byt_auto_demotion_disable_flag = true,
|
|
};
|
|
|
|
static const struct idle_cpu idle_cpu_cht = {
|
|
.state_table = cht_cstates,
|
|
.disable_promotion_to_c1e = true,
|
|
.byt_auto_demotion_disable_flag = true,
|
|
};
|
|
|
|
static const struct idle_cpu idle_cpu_ivb = {
|
|
.state_table = ivb_cstates,
|
|
.disable_promotion_to_c1e = true,
|
|
};
|
|
|
|
static const struct idle_cpu idle_cpu_ivt = {
|
|
.state_table = ivt_cstates,
|
|
.disable_promotion_to_c1e = true,
|
|
};
|
|
|
|
static const struct idle_cpu idle_cpu_hsw = {
|
|
.state_table = hsw_cstates,
|
|
.disable_promotion_to_c1e = true,
|
|
};
|
|
|
|
static const struct idle_cpu idle_cpu_bdw = {
|
|
.state_table = bdw_cstates,
|
|
.disable_promotion_to_c1e = true,
|
|
};
|
|
|
|
static const struct idle_cpu idle_cpu_skl = {
|
|
.state_table = skl_cstates,
|
|
.disable_promotion_to_c1e = true,
|
|
};
|
|
|
|
static const struct idle_cpu idle_cpu_skx = {
|
|
.state_table = skx_cstates,
|
|
.disable_promotion_to_c1e = true,
|
|
};
|
|
|
|
static const struct idle_cpu idle_cpu_avn = {
|
|
.state_table = avn_cstates,
|
|
.disable_promotion_to_c1e = true,
|
|
};
|
|
|
|
static const struct idle_cpu idle_cpu_knl = {
|
|
.state_table = knl_cstates,
|
|
};
|
|
|
|
static const struct idle_cpu idle_cpu_bxt = {
|
|
.state_table = bxt_cstates,
|
|
.disable_promotion_to_c1e = true,
|
|
};
|
|
|
|
static const struct idle_cpu idle_cpu_dnv = {
|
|
.state_table = dnv_cstates,
|
|
.disable_promotion_to_c1e = true,
|
|
};
|
|
|
|
#define ICPU(model, cpu) \
|
|
{ X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (unsigned long)&cpu }
|
|
|
|
static const struct x86_cpu_id intel_idle_ids[] __initconst = {
|
|
ICPU(INTEL_FAM6_NEHALEM_EP, idle_cpu_nehalem),
|
|
ICPU(INTEL_FAM6_NEHALEM, idle_cpu_nehalem),
|
|
ICPU(INTEL_FAM6_NEHALEM_G, idle_cpu_nehalem),
|
|
ICPU(INTEL_FAM6_WESTMERE, idle_cpu_nehalem),
|
|
ICPU(INTEL_FAM6_WESTMERE_EP, idle_cpu_nehalem),
|
|
ICPU(INTEL_FAM6_NEHALEM_EX, idle_cpu_nehalem),
|
|
ICPU(INTEL_FAM6_ATOM_BONNELL, idle_cpu_atom),
|
|
ICPU(INTEL_FAM6_ATOM_BONNELL_MID, idle_cpu_lincroft),
|
|
ICPU(INTEL_FAM6_WESTMERE_EX, idle_cpu_nehalem),
|
|
ICPU(INTEL_FAM6_SANDYBRIDGE, idle_cpu_snb),
|
|
ICPU(INTEL_FAM6_SANDYBRIDGE_X, idle_cpu_snb),
|
|
ICPU(INTEL_FAM6_ATOM_SALTWELL, idle_cpu_atom),
|
|
ICPU(INTEL_FAM6_ATOM_SILVERMONT, idle_cpu_byt),
|
|
ICPU(INTEL_FAM6_ATOM_SILVERMONT_MID, idle_cpu_tangier),
|
|
ICPU(INTEL_FAM6_ATOM_AIRMONT, idle_cpu_cht),
|
|
ICPU(INTEL_FAM6_IVYBRIDGE, idle_cpu_ivb),
|
|
ICPU(INTEL_FAM6_IVYBRIDGE_X, idle_cpu_ivt),
|
|
ICPU(INTEL_FAM6_HASWELL_CORE, idle_cpu_hsw),
|
|
ICPU(INTEL_FAM6_HASWELL_X, idle_cpu_hsw),
|
|
ICPU(INTEL_FAM6_HASWELL_ULT, idle_cpu_hsw),
|
|
ICPU(INTEL_FAM6_HASWELL_GT3E, idle_cpu_hsw),
|
|
ICPU(INTEL_FAM6_ATOM_SILVERMONT_X, idle_cpu_avn),
|
|
ICPU(INTEL_FAM6_BROADWELL_CORE, idle_cpu_bdw),
|
|
ICPU(INTEL_FAM6_BROADWELL_GT3E, idle_cpu_bdw),
|
|
ICPU(INTEL_FAM6_BROADWELL_X, idle_cpu_bdw),
|
|
ICPU(INTEL_FAM6_BROADWELL_XEON_D, idle_cpu_bdw),
|
|
ICPU(INTEL_FAM6_SKYLAKE_MOBILE, idle_cpu_skl),
|
|
ICPU(INTEL_FAM6_SKYLAKE_DESKTOP, idle_cpu_skl),
|
|
ICPU(INTEL_FAM6_KABYLAKE_MOBILE, idle_cpu_skl),
|
|
ICPU(INTEL_FAM6_KABYLAKE_DESKTOP, idle_cpu_skl),
|
|
ICPU(INTEL_FAM6_SKYLAKE_X, idle_cpu_skx),
|
|
ICPU(INTEL_FAM6_XEON_PHI_KNL, idle_cpu_knl),
|
|
ICPU(INTEL_FAM6_XEON_PHI_KNM, idle_cpu_knl),
|
|
ICPU(INTEL_FAM6_ATOM_GOLDMONT, idle_cpu_bxt),
|
|
ICPU(INTEL_FAM6_ATOM_GOLDMONT_PLUS, idle_cpu_bxt),
|
|
ICPU(INTEL_FAM6_ATOM_GOLDMONT_X, idle_cpu_dnv),
|
|
{}
|
|
};
|
|
|
|
/*
|
|
* intel_idle_probe()
|
|
*/
|
|
static int __init intel_idle_probe(void)
|
|
{
|
|
unsigned int eax, ebx, ecx;
|
|
const struct x86_cpu_id *id;
|
|
|
|
if (max_cstate == 0) {
|
|
pr_debug("disabled\n");
|
|
return -EPERM;
|
|
}
|
|
|
|
id = x86_match_cpu(intel_idle_ids);
|
|
if (!id) {
|
|
if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
|
|
boot_cpu_data.x86 == 6)
|
|
pr_debug("does not run on family %d model %d\n",
|
|
boot_cpu_data.x86, boot_cpu_data.x86_model);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (!boot_cpu_has(X86_FEATURE_MWAIT)) {
|
|
pr_debug("Please enable MWAIT in BIOS SETUP\n");
|
|
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;
|
|
cpuidle_state_table = icpu->state_table;
|
|
|
|
pr_debug("v" INTEL_IDLE_VERSION " model 0x%X\n",
|
|
boot_cpu_data.x86_model);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* intel_idle_cpuidle_devices_uninit()
|
|
* Unregisters the cpuidle devices.
|
|
*/
|
|
static void intel_idle_cpuidle_devices_uninit(void)
|
|
{
|
|
int i;
|
|
struct cpuidle_device *dev;
|
|
|
|
for_each_online_cpu(i) {
|
|
dev = per_cpu_ptr(intel_idle_cpuidle_devices, i);
|
|
cpuidle_unregister_device(dev);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ivt_idle_state_table_update(void)
|
|
*
|
|
* Tune IVT multi-socket targets
|
|
* Assumption: num_sockets == (max_package_num + 1)
|
|
*/
|
|
static void 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 */
|
|
}
|
|
|
|
/*
|
|
* Translate IRTL (Interrupt Response Time Limit) MSR to usec
|
|
*/
|
|
|
|
static unsigned int irtl_ns_units[] = {
|
|
1, 32, 1024, 32768, 1048576, 33554432, 0, 0 };
|
|
|
|
static unsigned long long irtl_2_usec(unsigned long long irtl)
|
|
{
|
|
unsigned long long ns;
|
|
|
|
if (!irtl)
|
|
return 0;
|
|
|
|
ns = irtl_ns_units[(irtl >> 10) & 0x7];
|
|
|
|
return div64_u64((irtl & 0x3FF) * ns, 1000);
|
|
}
|
|
/*
|
|
* bxt_idle_state_table_update(void)
|
|
*
|
|
* On BXT, we trust the IRTL to show the definitive maximum latency
|
|
* We use the same value for target_residency.
|
|
*/
|
|
static void 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(void)
|
|
*
|
|
* On SKL-H (model 0x5e) disable C8 and C9 if:
|
|
* C10 is enabled and SGX disabled
|
|
*/
|
|
static void 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_FEATURE_CONTROL, msr);
|
|
|
|
/* if SGX is enabled */
|
|
if (msr & (1 << 18))
|
|
return;
|
|
}
|
|
|
|
skl_cstates[5].disabled = 1; /* C8-SKL */
|
|
skl_cstates[6].disabled = 1; /* C9-SKL */
|
|
}
|
|
/*
|
|
* intel_idle_state_table_update()
|
|
*
|
|
* Update the default state_table for this CPU-id
|
|
*/
|
|
|
|
static void intel_idle_state_table_update(void)
|
|
{
|
|
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_DESKTOP:
|
|
sklh_idle_state_table_update();
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* intel_idle_cpuidle_driver_init()
|
|
* allocate, initialize cpuidle_states
|
|
*/
|
|
static void __init intel_idle_cpuidle_driver_init(void)
|
|
{
|
|
int cstate;
|
|
struct cpuidle_driver *drv = &intel_idle_driver;
|
|
|
|
intel_idle_state_table_update();
|
|
|
|
cpuidle_poll_state_init(drv);
|
|
drv->state_count = 1;
|
|
|
|
for (cstate = 0; cstate < CPUIDLE_STATE_MAX; ++cstate) {
|
|
int num_substates, mwait_hint, mwait_cstate;
|
|
|
|
if ((cpuidle_state_table[cstate].enter == NULL) &&
|
|
(cpuidle_state_table[cstate].enter_s2idle == NULL))
|
|
break;
|
|
|
|
if (cstate + 1 > max_cstate) {
|
|
pr_info("max_cstate %d reached\n", max_cstate);
|
|
break;
|
|
}
|
|
|
|
mwait_hint = flg2MWAIT(cpuidle_state_table[cstate].flags);
|
|
mwait_cstate = MWAIT_HINT2CSTATE(mwait_hint);
|
|
|
|
/* number of sub-states for this state in CPUID.MWAIT */
|
|
num_substates = (mwait_substates >> ((mwait_cstate + 1) * 4))
|
|
& MWAIT_SUBSTATE_MASK;
|
|
|
|
/* if NO sub-states for this state in CPUID, skip it */
|
|
if (num_substates == 0)
|
|
continue;
|
|
|
|
/* if state marked as disabled, skip it */
|
|
if (cpuidle_state_table[cstate].disabled != 0) {
|
|
pr_debug("state %s is disabled\n",
|
|
cpuidle_state_table[cstate].name);
|
|
continue;
|
|
}
|
|
|
|
|
|
if (((mwait_cstate + 1) > 2) &&
|
|
!boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
|
|
mark_tsc_unstable("TSC halts in idle"
|
|
" states deeper than C2");
|
|
|
|
drv->states[drv->state_count] = /* structure copy */
|
|
cpuidle_state_table[cstate];
|
|
|
|
drv->state_count += 1;
|
|
}
|
|
|
|
if (icpu->byt_auto_demotion_disable_flag) {
|
|
wrmsrl(MSR_CC6_DEMOTION_POLICY_CONFIG, 0);
|
|
wrmsrl(MSR_MC6_DEMOTION_POLICY_CONFIG, 0);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* intel_idle_cpu_init()
|
|
* allocate, initialize, register cpuidle_devices
|
|
* @cpu: cpu/core to initialize
|
|
*/
|
|
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 (icpu->auto_demotion_disable_flags)
|
|
auto_demotion_disable();
|
|
|
|
if (icpu->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_reliable_states != LAPIC_TIMER_ALWAYS_RELIABLE)
|
|
__setup_broadcast_timer(true);
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
static int __init intel_idle_init(void)
|
|
{
|
|
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;
|
|
|
|
retval = intel_idle_probe();
|
|
if (retval)
|
|
return retval;
|
|
|
|
intel_idle_cpuidle_devices = alloc_percpu(struct cpuidle_device);
|
|
if (intel_idle_cpuidle_devices == NULL)
|
|
return -ENOMEM;
|
|
|
|
intel_idle_cpuidle_driver_init();
|
|
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_reliable_states = LAPIC_TIMER_ALWAYS_RELIABLE;
|
|
|
|
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("lapic_timer_reliable_states 0x%x\n",
|
|
lapic_timer_reliable_states);
|
|
|
|
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);
|
|
|