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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/idle
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/idle')
-rw-r--r--drivers/idle/Kconfig11
-rw-r--r--drivers/idle/Makefile3
-rw-r--r--drivers/idle/intel_idle.c2149
3 files changed, 2163 insertions, 0 deletions
diff --git a/drivers/idle/Kconfig b/drivers/idle/Kconfig
new file mode 100644
index 000000000..6707d2539
--- /dev/null
+++ b/drivers/idle/Kconfig
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config INTEL_IDLE
+ bool "Cpuidle Driver for Intel Processors"
+ depends on CPU_IDLE
+ depends on X86
+ depends on CPU_SUP_INTEL
+ help
+ Enable intel_idle, a cpuidle driver that includes knowledge of
+ native Intel hardware idle features. The acpi_idle driver
+ can be configured at the same time, in order to handle
+ processors intel_idle does not support.
diff --git a/drivers/idle/Makefile b/drivers/idle/Makefile
new file mode 100644
index 000000000..0a3c37510
--- /dev/null
+++ b/drivers/idle/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_INTEL_IDLE) += intel_idle.o
+
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
new file mode 100644
index 000000000..bb3d10099
--- /dev/null
+++ b/drivers/idle/intel_idle.c
@@ -0,0 +1,2149 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * intel_idle.c - native hardware idle loop for modern Intel processors
+ *
+ * Copyright (c) 2013 - 2020, Intel Corporation.
+ * Len Brown <len.brown@intel.com>
+ * Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+ */
+
+/*
+ * intel_idle is a cpuidle driver that loads on all Intel CPUs with MWAIT
+ * in lieu of the legacy ACPI processor_idle driver. The intent is to
+ * make Linux more efficient on these processors, as intel_idle knows
+ * more than ACPI, as well as make Linux more immune to ACPI BIOS bugs.
+ */
+
+/*
+ * Design Assumptions
+ *
+ * All CPUs have same idle states as boot CPU
+ *
+ * Chipset BM_STS (bus master status) bit is a NOP
+ * for preventing entry into deep C-states
+ *
+ * CPU will flush caches as needed when entering a C-state via MWAIT
+ * (in contrast to entering ACPI C3, in which case the WBINVD
+ * instruction needs to be executed to flush the caches)
+ */
+
+/*
+ * Known limitations
+ *
+ * ACPI has a .suspend hack to turn off deep c-statees during suspend
+ * to avoid complications with the lapic timer workaround.
+ * Have not seen issues with suspend, but may need same workaround here.
+ *
+ */
+
+/* un-comment DEBUG to enable pr_debug() statements */
+/* #define DEBUG */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/acpi.h>
+#include <linux/kernel.h>
+#include <linux/cpuidle.h>
+#include <linux/tick.h>
+#include <trace/events/power.h>
+#include <linux/sched.h>
+#include <linux/sched/smt.h>
+#include <linux/notifier.h>
+#include <linux/cpu.h>
+#include <linux/moduleparam.h>
+#include <asm/cpu_device_id.h>
+#include <asm/intel-family.h>
+#include <asm/nospec-branch.h>
+#include <asm/mwait.h>
+#include <asm/msr.h>
+#include <asm/fpu/api.h>
+
+#define INTEL_IDLE_VERSION "0.5.1"
+
+static struct cpuidle_driver intel_idle_driver = {
+ .name = "intel_idle",
+ .owner = THIS_MODULE,
+};
+/* intel_idle.max_cstate=0 disables driver */
+static int max_cstate = CPUIDLE_STATE_MAX - 1;
+static unsigned int disabled_states_mask;
+static unsigned int preferred_states_mask;
+
+static struct cpuidle_device __percpu *intel_idle_cpuidle_devices;
+
+static unsigned long auto_demotion_disable_flags;
+
+static enum {
+ C1E_PROMOTION_PRESERVE,
+ C1E_PROMOTION_ENABLE,
+ C1E_PROMOTION_DISABLE
+} c1e_promotion = C1E_PROMOTION_PRESERVE;
+
+struct idle_cpu {
+ struct cpuidle_state *state_table;
+
+ /*
+ * Hardware C-state auto-demotion may not always be optimal.
+ * Indicate which enable bits to clear here.
+ */
+ unsigned long auto_demotion_disable_flags;
+ bool byt_auto_demotion_disable_flag;
+ bool disable_promotion_to_c1e;
+ bool use_acpi;
+};
+
+static const struct idle_cpu *icpu __initdata;
+static struct cpuidle_state *cpuidle_state_table __initdata;
+
+static unsigned int mwait_substates __initdata;
+
+/*
+ * Enable interrupts before entering the C-state. On some platforms and for
+ * some C-states, this may measurably decrease interrupt latency.
+ */
+#define CPUIDLE_FLAG_IRQ_ENABLE BIT(14)
+
+/*
+ * Enable this state by default even if the ACPI _CST does not list it.
+ */
+#define CPUIDLE_FLAG_ALWAYS_ENABLE BIT(15)
+
+/*
+ * Disable IBRS across idle (when KERNEL_IBRS), is exclusive vs IRQ_ENABLE
+ * above.
+ */
+#define CPUIDLE_FLAG_IBRS BIT(16)
+
+/*
+ * Initialize large xstate for the C6-state entrance.
+ */
+#define CPUIDLE_FLAG_INIT_XSTATE BIT(17)
+
+/*
+ * MWAIT takes an 8-bit "hint" in EAX "suggesting"
+ * the C-state (top nibble) and sub-state (bottom nibble)
+ * 0x00 means "MWAIT(C1)", 0x10 means "MWAIT(C2)" etc.
+ *
+ * We store the hint at the top of our "flags" for each state.
+ */
+#define flg2MWAIT(flags) (((flags) >> 24) & 0xFF)
+#define MWAIT2flg(eax) ((eax & 0xFF) << 24)
+
+static __always_inline int __intel_idle(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv, int index)
+{
+ struct cpuidle_state *state = &drv->states[index];
+ unsigned long eax = flg2MWAIT(state->flags);
+ unsigned long ecx = 1; /* break on interrupt flag */
+
+ mwait_idle_with_hints(eax, ecx);
+
+ return index;
+}
+
+/**
+ * intel_idle - Ask the processor to enter the given idle state.
+ * @dev: cpuidle device of the target CPU.
+ * @drv: cpuidle driver (assumed to point to intel_idle_driver).
+ * @index: Target idle state index.
+ *
+ * Use the MWAIT instruction to notify the processor that the CPU represented by
+ * @dev is idle and it can try to enter the idle state corresponding to @index.
+ *
+ * If the local APIC timer is not known to be reliable in the target idle state,
+ * enable one-shot tick broadcasting for the target CPU before executing MWAIT.
+ *
+ * Must be called under local_irq_disable().
+ */
+static __cpuidle int intel_idle(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv, int index)
+{
+ return __intel_idle(dev, drv, index);
+}
+
+static __cpuidle int intel_idle_irq(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv, int index)
+{
+ int ret;
+
+ raw_local_irq_enable();
+ ret = __intel_idle(dev, drv, index);
+
+ /*
+ * The lockdep hardirqs state may be changed to 'on' with timer
+ * tick interrupt followed by __do_softirq(). Use local_irq_disable()
+ * to keep the hardirqs state correct.
+ */
+ local_irq_disable();
+
+ return ret;
+}
+
+static __cpuidle int intel_idle_ibrs(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv, int index)
+{
+ bool smt_active = sched_smt_active();
+ u64 spec_ctrl = spec_ctrl_current();
+ int ret;
+
+ if (smt_active)
+ wrmsrl(MSR_IA32_SPEC_CTRL, 0);
+
+ ret = __intel_idle(dev, drv, index);
+
+ if (smt_active)
+ wrmsrl(MSR_IA32_SPEC_CTRL, spec_ctrl);
+
+ return ret;
+}
+
+static __cpuidle int intel_idle_xstate(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv, int index)
+{
+ fpu_idle_fpregs();
+ return __intel_idle(dev, drv, index);
+}
+
+/**
+ * intel_idle_s2idle - Ask the processor to enter the given idle state.
+ * @dev: cpuidle device of the target CPU.
+ * @drv: cpuidle driver (assumed to point to intel_idle_driver).
+ * @index: Target idle state index.
+ *
+ * Use the MWAIT instruction to notify the processor that the CPU represented by
+ * @dev is idle and it can try to enter the idle state corresponding to @index.
+ *
+ * Invoked as a suspend-to-idle callback routine with frozen user space, frozen
+ * scheduler tick and suspended scheduler clock on the target CPU.
+ */
+static __cpuidle int intel_idle_s2idle(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv, int index)
+{
+ unsigned long ecx = 1; /* break on interrupt flag */
+ struct cpuidle_state *state = &drv->states[index];
+ unsigned long eax = flg2MWAIT(state->flags);
+
+ if (state->flags & CPUIDLE_FLAG_INIT_XSTATE)
+ fpu_idle_fpregs();
+
+ mwait_idle_with_hints(eax, ecx);
+
+ return 0;
+}
+
+/*
+ * States are indexed by the cstate number,
+ * which is also the index into the MWAIT hint array.
+ * Thus C0 is a dummy.
+ */
+static struct cpuidle_state nehalem_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 3,
+ .target_residency = 6,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,
+ .exit_latency = 10,
+ .target_residency = 20,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C3",
+ .desc = "MWAIT 0x10",
+ .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 20,
+ .target_residency = 80,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x20",
+ .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 200,
+ .target_residency = 800,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
+static struct cpuidle_state snb_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 2,
+ .target_residency = 2,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,
+ .exit_latency = 10,
+ .target_residency = 20,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C3",
+ .desc = "MWAIT 0x10",
+ .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 80,
+ .target_residency = 211,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x20",
+ .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 104,
+ .target_residency = 345,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C7",
+ .desc = "MWAIT 0x30",
+ .flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 109,
+ .target_residency = 345,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
+static struct cpuidle_state byt_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 1,
+ .target_residency = 1,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6N",
+ .desc = "MWAIT 0x58",
+ .flags = MWAIT2flg(0x58) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 300,
+ .target_residency = 275,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6S",
+ .desc = "MWAIT 0x52",
+ .flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 500,
+ .target_residency = 560,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C7",
+ .desc = "MWAIT 0x60",
+ .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 1200,
+ .target_residency = 4000,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C7S",
+ .desc = "MWAIT 0x64",
+ .flags = MWAIT2flg(0x64) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 10000,
+ .target_residency = 20000,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
+static struct cpuidle_state cht_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 1,
+ .target_residency = 1,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6N",
+ .desc = "MWAIT 0x58",
+ .flags = MWAIT2flg(0x58) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 80,
+ .target_residency = 275,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6S",
+ .desc = "MWAIT 0x52",
+ .flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 200,
+ .target_residency = 560,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C7",
+ .desc = "MWAIT 0x60",
+ .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 1200,
+ .target_residency = 4000,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C7S",
+ .desc = "MWAIT 0x64",
+ .flags = MWAIT2flg(0x64) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 10000,
+ .target_residency = 20000,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
+static struct cpuidle_state ivb_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 1,
+ .target_residency = 1,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,
+ .exit_latency = 10,
+ .target_residency = 20,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C3",
+ .desc = "MWAIT 0x10",
+ .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 59,
+ .target_residency = 156,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x20",
+ .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 80,
+ .target_residency = 300,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C7",
+ .desc = "MWAIT 0x30",
+ .flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 87,
+ .target_residency = 300,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
+static struct cpuidle_state ivt_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 1,
+ .target_residency = 1,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,
+ .exit_latency = 10,
+ .target_residency = 80,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C3",
+ .desc = "MWAIT 0x10",
+ .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 59,
+ .target_residency = 156,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x20",
+ .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 82,
+ .target_residency = 300,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
+static struct cpuidle_state ivt_cstates_4s[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 1,
+ .target_residency = 1,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,
+ .exit_latency = 10,
+ .target_residency = 250,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C3",
+ .desc = "MWAIT 0x10",
+ .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 59,
+ .target_residency = 300,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x20",
+ .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 84,
+ .target_residency = 400,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
+static struct cpuidle_state ivt_cstates_8s[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 1,
+ .target_residency = 1,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,
+ .exit_latency = 10,
+ .target_residency = 500,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C3",
+ .desc = "MWAIT 0x10",
+ .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 59,
+ .target_residency = 600,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x20",
+ .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 88,
+ .target_residency = 700,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
+static struct cpuidle_state hsw_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 2,
+ .target_residency = 2,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,
+ .exit_latency = 10,
+ .target_residency = 20,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C3",
+ .desc = "MWAIT 0x10",
+ .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 33,
+ .target_residency = 100,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x20",
+ .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 133,
+ .target_residency = 400,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C7s",
+ .desc = "MWAIT 0x32",
+ .flags = MWAIT2flg(0x32) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 166,
+ .target_residency = 500,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C8",
+ .desc = "MWAIT 0x40",
+ .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 300,
+ .target_residency = 900,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C9",
+ .desc = "MWAIT 0x50",
+ .flags = MWAIT2flg(0x50) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 600,
+ .target_residency = 1800,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C10",
+ .desc = "MWAIT 0x60",
+ .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 2600,
+ .target_residency = 7700,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+static struct cpuidle_state bdw_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 2,
+ .target_residency = 2,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,
+ .exit_latency = 10,
+ .target_residency = 20,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C3",
+ .desc = "MWAIT 0x10",
+ .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 40,
+ .target_residency = 100,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x20",
+ .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 133,
+ .target_residency = 400,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C7s",
+ .desc = "MWAIT 0x32",
+ .flags = MWAIT2flg(0x32) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 166,
+ .target_residency = 500,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C8",
+ .desc = "MWAIT 0x40",
+ .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 300,
+ .target_residency = 900,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C9",
+ .desc = "MWAIT 0x50",
+ .flags = MWAIT2flg(0x50) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 600,
+ .target_residency = 1800,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C10",
+ .desc = "MWAIT 0x60",
+ .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 2600,
+ .target_residency = 7700,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
+static struct cpuidle_state skl_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 2,
+ .target_residency = 2,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,
+ .exit_latency = 10,
+ .target_residency = 20,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C3",
+ .desc = "MWAIT 0x10",
+ .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 70,
+ .target_residency = 100,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x20",
+ .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED | CPUIDLE_FLAG_IBRS,
+ .exit_latency = 85,
+ .target_residency = 200,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C7s",
+ .desc = "MWAIT 0x33",
+ .flags = MWAIT2flg(0x33) | CPUIDLE_FLAG_TLB_FLUSHED | CPUIDLE_FLAG_IBRS,
+ .exit_latency = 124,
+ .target_residency = 800,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C8",
+ .desc = "MWAIT 0x40",
+ .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED | CPUIDLE_FLAG_IBRS,
+ .exit_latency = 200,
+ .target_residency = 800,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C9",
+ .desc = "MWAIT 0x50",
+ .flags = MWAIT2flg(0x50) | CPUIDLE_FLAG_TLB_FLUSHED | CPUIDLE_FLAG_IBRS,
+ .exit_latency = 480,
+ .target_residency = 5000,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C10",
+ .desc = "MWAIT 0x60",
+ .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED | CPUIDLE_FLAG_IBRS,
+ .exit_latency = 890,
+ .target_residency = 5000,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
+static struct cpuidle_state skx_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00) | CPUIDLE_FLAG_IRQ_ENABLE,
+ .exit_latency = 2,
+ .target_residency = 2,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,
+ .exit_latency = 10,
+ .target_residency = 20,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x20",
+ .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED | CPUIDLE_FLAG_IBRS,
+ .exit_latency = 133,
+ .target_residency = 600,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
+static struct cpuidle_state icx_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00) | CPUIDLE_FLAG_IRQ_ENABLE,
+ .exit_latency = 1,
+ .target_residency = 1,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,
+ .exit_latency = 4,
+ .target_residency = 4,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x20",
+ .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 170,
+ .target_residency = 600,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
+/*
+ * On AlderLake C1 has to be disabled if C1E is enabled, and vice versa.
+ * C1E is enabled only if "C1E promotion" bit is set in MSR_IA32_POWER_CTL.
+ * But in this case there is effectively no C1, because C1 requests are
+ * promoted to C1E. If the "C1E promotion" bit is cleared, then both C1
+ * and C1E requests end up with C1, so there is effectively no C1E.
+ *
+ * By default we enable C1E and disable C1 by marking it with
+ * 'CPUIDLE_FLAG_UNUSABLE'.
+ */
+static struct cpuidle_state adl_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00) | CPUIDLE_FLAG_UNUSABLE,
+ .exit_latency = 1,
+ .target_residency = 1,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,
+ .exit_latency = 2,
+ .target_residency = 4,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x20",
+ .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 220,
+ .target_residency = 600,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C8",
+ .desc = "MWAIT 0x40",
+ .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 280,
+ .target_residency = 800,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C10",
+ .desc = "MWAIT 0x60",
+ .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 680,
+ .target_residency = 2000,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
+static struct cpuidle_state adl_l_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00) | CPUIDLE_FLAG_UNUSABLE,
+ .exit_latency = 1,
+ .target_residency = 1,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,
+ .exit_latency = 2,
+ .target_residency = 4,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x20",
+ .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 170,
+ .target_residency = 500,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C8",
+ .desc = "MWAIT 0x40",
+ .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 200,
+ .target_residency = 600,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C10",
+ .desc = "MWAIT 0x60",
+ .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 230,
+ .target_residency = 700,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
+static struct cpuidle_state adl_n_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00) | CPUIDLE_FLAG_UNUSABLE,
+ .exit_latency = 1,
+ .target_residency = 1,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,
+ .exit_latency = 2,
+ .target_residency = 4,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x20",
+ .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 195,
+ .target_residency = 585,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C8",
+ .desc = "MWAIT 0x40",
+ .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 260,
+ .target_residency = 1040,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C10",
+ .desc = "MWAIT 0x60",
+ .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 660,
+ .target_residency = 1980,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
+static struct cpuidle_state spr_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 1,
+ .target_residency = 1,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,
+ .exit_latency = 2,
+ .target_residency = 4,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x20",
+ .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED |
+ CPUIDLE_FLAG_INIT_XSTATE,
+ .exit_latency = 290,
+ .target_residency = 800,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
+static struct cpuidle_state atom_cstates[] __initdata = {
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 10,
+ .target_residency = 20,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C2",
+ .desc = "MWAIT 0x10",
+ .flags = MWAIT2flg(0x10),
+ .exit_latency = 20,
+ .target_residency = 80,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C4",
+ .desc = "MWAIT 0x30",
+ .flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 100,
+ .target_residency = 400,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x52",
+ .flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 140,
+ .target_residency = 560,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+static struct cpuidle_state tangier_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 1,
+ .target_residency = 4,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C4",
+ .desc = "MWAIT 0x30",
+ .flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 100,
+ .target_residency = 400,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x52",
+ .flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 140,
+ .target_residency = 560,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C7",
+ .desc = "MWAIT 0x60",
+ .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 1200,
+ .target_residency = 4000,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C9",
+ .desc = "MWAIT 0x64",
+ .flags = MWAIT2flg(0x64) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 10000,
+ .target_residency = 20000,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+static struct cpuidle_state avn_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 2,
+ .target_residency = 2,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x51",
+ .flags = MWAIT2flg(0x51) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 15,
+ .target_residency = 45,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+static struct cpuidle_state knl_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 1,
+ .target_residency = 2,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x10",
+ .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 120,
+ .target_residency = 500,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle },
+ {
+ .enter = NULL }
+};
+
+static struct cpuidle_state bxt_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 2,
+ .target_residency = 2,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,
+ .exit_latency = 10,
+ .target_residency = 20,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x20",
+ .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 133,
+ .target_residency = 133,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C7s",
+ .desc = "MWAIT 0x31",
+ .flags = MWAIT2flg(0x31) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 155,
+ .target_residency = 155,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C8",
+ .desc = "MWAIT 0x40",
+ .flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 1000,
+ .target_residency = 1000,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C9",
+ .desc = "MWAIT 0x50",
+ .flags = MWAIT2flg(0x50) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 2000,
+ .target_residency = 2000,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C10",
+ .desc = "MWAIT 0x60",
+ .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 10000,
+ .target_residency = 10000,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
+static struct cpuidle_state dnv_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 2,
+ .target_residency = 2,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,
+ .exit_latency = 10,
+ .target_residency = 20,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x20",
+ .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 50,
+ .target_residency = 500,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
+/*
+ * Note, depending on HW and FW revision, SnowRidge SoC may or may not support
+ * C6, and this is indicated in the CPUID mwait leaf.
+ */
+static struct cpuidle_state snr_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 2,
+ .target_residency = 2,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,
+ .exit_latency = 15,
+ .target_residency = 25,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x20",
+ .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 130,
+ .target_residency = 500,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
+static const struct idle_cpu idle_cpu_nehalem __initconst = {
+ .state_table = nehalem_cstates,
+ .auto_demotion_disable_flags = NHM_C1_AUTO_DEMOTE | NHM_C3_AUTO_DEMOTE,
+ .disable_promotion_to_c1e = true,
+};
+
+static const struct idle_cpu idle_cpu_nhx __initconst = {
+ .state_table = nehalem_cstates,
+ .auto_demotion_disable_flags = NHM_C1_AUTO_DEMOTE | NHM_C3_AUTO_DEMOTE,
+ .disable_promotion_to_c1e = true,
+ .use_acpi = true,
+};
+
+static const struct idle_cpu idle_cpu_atom __initconst = {
+ .state_table = atom_cstates,
+};
+
+static const struct idle_cpu idle_cpu_tangier __initconst = {
+ .state_table = tangier_cstates,
+};
+
+static const struct idle_cpu idle_cpu_lincroft __initconst = {
+ .state_table = atom_cstates,
+ .auto_demotion_disable_flags = ATM_LNC_C6_AUTO_DEMOTE,
+};
+
+static const struct idle_cpu idle_cpu_snb __initconst = {
+ .state_table = snb_cstates,
+ .disable_promotion_to_c1e = true,
+};
+
+static const struct idle_cpu idle_cpu_snx __initconst = {
+ .state_table = snb_cstates,
+ .disable_promotion_to_c1e = true,
+ .use_acpi = true,
+};
+
+static const struct idle_cpu idle_cpu_byt __initconst = {
+ .state_table = byt_cstates,
+ .disable_promotion_to_c1e = true,
+ .byt_auto_demotion_disable_flag = true,
+};
+
+static const struct idle_cpu idle_cpu_cht __initconst = {
+ .state_table = cht_cstates,
+ .disable_promotion_to_c1e = true,
+ .byt_auto_demotion_disable_flag = true,
+};
+
+static const struct idle_cpu idle_cpu_ivb __initconst = {
+ .state_table = ivb_cstates,
+ .disable_promotion_to_c1e = true,
+};
+
+static const struct idle_cpu idle_cpu_ivt __initconst = {
+ .state_table = ivt_cstates,
+ .disable_promotion_to_c1e = true,
+ .use_acpi = true,
+};
+
+static const struct idle_cpu idle_cpu_hsw __initconst = {
+ .state_table = hsw_cstates,
+ .disable_promotion_to_c1e = true,
+};
+
+static const struct idle_cpu idle_cpu_hsx __initconst = {
+ .state_table = hsw_cstates,
+ .disable_promotion_to_c1e = true,
+ .use_acpi = true,
+};
+
+static const struct idle_cpu idle_cpu_bdw __initconst = {
+ .state_table = bdw_cstates,
+ .disable_promotion_to_c1e = true,
+};
+
+static const struct idle_cpu idle_cpu_bdx __initconst = {
+ .state_table = bdw_cstates,
+ .disable_promotion_to_c1e = true,
+ .use_acpi = true,
+};
+
+static const struct idle_cpu idle_cpu_skl __initconst = {
+ .state_table = skl_cstates,
+ .disable_promotion_to_c1e = true,
+};
+
+static const struct idle_cpu idle_cpu_skx __initconst = {
+ .state_table = skx_cstates,
+ .disable_promotion_to_c1e = true,
+ .use_acpi = true,
+};
+
+static const struct idle_cpu idle_cpu_icx __initconst = {
+ .state_table = icx_cstates,
+ .disable_promotion_to_c1e = true,
+ .use_acpi = true,
+};
+
+static const struct idle_cpu idle_cpu_adl __initconst = {
+ .state_table = adl_cstates,
+};
+
+static const struct idle_cpu idle_cpu_adl_l __initconst = {
+ .state_table = adl_l_cstates,
+};
+
+static const struct idle_cpu idle_cpu_adl_n __initconst = {
+ .state_table = adl_n_cstates,
+};
+
+static const struct idle_cpu idle_cpu_spr __initconst = {
+ .state_table = spr_cstates,
+ .disable_promotion_to_c1e = true,
+ .use_acpi = true,
+};
+
+static const struct idle_cpu idle_cpu_avn __initconst = {
+ .state_table = avn_cstates,
+ .disable_promotion_to_c1e = true,
+ .use_acpi = true,
+};
+
+static const struct idle_cpu idle_cpu_knl __initconst = {
+ .state_table = knl_cstates,
+ .use_acpi = true,
+};
+
+static const struct idle_cpu idle_cpu_bxt __initconst = {
+ .state_table = bxt_cstates,
+ .disable_promotion_to_c1e = true,
+};
+
+static const struct idle_cpu idle_cpu_dnv __initconst = {
+ .state_table = dnv_cstates,
+ .disable_promotion_to_c1e = true,
+ .use_acpi = true,
+};
+
+static const struct idle_cpu idle_cpu_snr __initconst = {
+ .state_table = snr_cstates,
+ .disable_promotion_to_c1e = true,
+ .use_acpi = true,
+};
+
+static const struct x86_cpu_id intel_idle_ids[] __initconst = {
+ X86_MATCH_INTEL_FAM6_MODEL(NEHALEM_EP, &idle_cpu_nhx),
+ X86_MATCH_INTEL_FAM6_MODEL(NEHALEM, &idle_cpu_nehalem),
+ X86_MATCH_INTEL_FAM6_MODEL(NEHALEM_G, &idle_cpu_nehalem),
+ X86_MATCH_INTEL_FAM6_MODEL(WESTMERE, &idle_cpu_nehalem),
+ X86_MATCH_INTEL_FAM6_MODEL(WESTMERE_EP, &idle_cpu_nhx),
+ X86_MATCH_INTEL_FAM6_MODEL(NEHALEM_EX, &idle_cpu_nhx),
+ X86_MATCH_INTEL_FAM6_MODEL(ATOM_BONNELL, &idle_cpu_atom),
+ X86_MATCH_INTEL_FAM6_MODEL(ATOM_BONNELL_MID, &idle_cpu_lincroft),
+ X86_MATCH_INTEL_FAM6_MODEL(WESTMERE_EX, &idle_cpu_nhx),
+ X86_MATCH_INTEL_FAM6_MODEL(SANDYBRIDGE, &idle_cpu_snb),
+ X86_MATCH_INTEL_FAM6_MODEL(SANDYBRIDGE_X, &idle_cpu_snx),
+ X86_MATCH_INTEL_FAM6_MODEL(ATOM_SALTWELL, &idle_cpu_atom),
+ X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT, &idle_cpu_byt),
+ X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_MID, &idle_cpu_tangier),
+ X86_MATCH_INTEL_FAM6_MODEL(ATOM_AIRMONT, &idle_cpu_cht),
+ X86_MATCH_INTEL_FAM6_MODEL(IVYBRIDGE, &idle_cpu_ivb),
+ X86_MATCH_INTEL_FAM6_MODEL(IVYBRIDGE_X, &idle_cpu_ivt),
+ X86_MATCH_INTEL_FAM6_MODEL(HASWELL, &idle_cpu_hsw),
+ X86_MATCH_INTEL_FAM6_MODEL(HASWELL_X, &idle_cpu_hsx),
+ X86_MATCH_INTEL_FAM6_MODEL(HASWELL_L, &idle_cpu_hsw),
+ X86_MATCH_INTEL_FAM6_MODEL(HASWELL_G, &idle_cpu_hsw),
+ X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_D, &idle_cpu_avn),
+ X86_MATCH_INTEL_FAM6_MODEL(BROADWELL, &idle_cpu_bdw),
+ X86_MATCH_INTEL_FAM6_MODEL(BROADWELL_G, &idle_cpu_bdw),
+ X86_MATCH_INTEL_FAM6_MODEL(BROADWELL_X, &idle_cpu_bdx),
+ X86_MATCH_INTEL_FAM6_MODEL(BROADWELL_D, &idle_cpu_bdx),
+ X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_L, &idle_cpu_skl),
+ X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE, &idle_cpu_skl),
+ X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE_L, &idle_cpu_skl),
+ X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE, &idle_cpu_skl),
+ X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_X, &idle_cpu_skx),
+ X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_X, &idle_cpu_icx),
+ X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_D, &idle_cpu_icx),
+ X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE, &idle_cpu_adl),
+ X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE_L, &idle_cpu_adl_l),
+ X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE_N, &idle_cpu_adl_n),
+ X86_MATCH_INTEL_FAM6_MODEL(SAPPHIRERAPIDS_X, &idle_cpu_spr),
+ X86_MATCH_INTEL_FAM6_MODEL(EMERALDRAPIDS_X, &idle_cpu_spr),
+ X86_MATCH_INTEL_FAM6_MODEL(XEON_PHI_KNL, &idle_cpu_knl),
+ X86_MATCH_INTEL_FAM6_MODEL(XEON_PHI_KNM, &idle_cpu_knl),
+ X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT, &idle_cpu_bxt),
+ X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT_PLUS, &idle_cpu_bxt),
+ X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT_D, &idle_cpu_dnv),
+ X86_MATCH_INTEL_FAM6_MODEL(ATOM_TREMONT_D, &idle_cpu_snr),
+ {}
+};
+
+static const struct x86_cpu_id intel_mwait_ids[] __initconst = {
+ X86_MATCH_VENDOR_FAM_FEATURE(INTEL, 6, X86_FEATURE_MWAIT, NULL),
+ {}
+};
+
+static bool __init intel_idle_max_cstate_reached(int cstate)
+{
+ if (cstate + 1 > max_cstate) {
+ pr_info("max_cstate %d reached\n", max_cstate);
+ return true;
+ }
+ return false;
+}
+
+static bool __init intel_idle_state_needs_timer_stop(struct cpuidle_state *state)
+{
+ unsigned long eax = flg2MWAIT(state->flags);
+
+ if (boot_cpu_has(X86_FEATURE_ARAT))
+ return false;
+
+ /*
+ * Switch over to one-shot tick broadcast if the target C-state
+ * is deeper than C1.
+ */
+ return !!((eax >> MWAIT_SUBSTATE_SIZE) & MWAIT_CSTATE_MASK);
+}
+
+#ifdef CONFIG_ACPI_PROCESSOR_CSTATE
+#include <acpi/processor.h>
+
+static bool no_acpi __read_mostly;
+module_param(no_acpi, bool, 0444);
+MODULE_PARM_DESC(no_acpi, "Do not use ACPI _CST for building the idle states list");
+
+static bool force_use_acpi __read_mostly; /* No effect if no_acpi is set. */
+module_param_named(use_acpi, force_use_acpi, bool, 0444);
+MODULE_PARM_DESC(use_acpi, "Use ACPI _CST for building the idle states list");
+
+static struct acpi_processor_power acpi_state_table __initdata;
+
+/**
+ * intel_idle_cst_usable - Check if the _CST information can be used.
+ *
+ * Check if all of the C-states listed by _CST in the max_cstate range are
+ * ACPI_CSTATE_FFH, which means that they should be entered via MWAIT.
+ */
+static bool __init intel_idle_cst_usable(void)
+{
+ int cstate, limit;
+
+ limit = min_t(int, min_t(int, CPUIDLE_STATE_MAX, max_cstate + 1),
+ acpi_state_table.count);
+
+ for (cstate = 1; cstate < limit; cstate++) {
+ struct acpi_processor_cx *cx = &acpi_state_table.states[cstate];
+
+ if (cx->entry_method != ACPI_CSTATE_FFH)
+ return false;
+ }
+
+ return true;
+}
+
+static bool __init intel_idle_acpi_cst_extract(void)
+{
+ unsigned int cpu;
+
+ if (no_acpi) {
+ pr_debug("Not allowed to use ACPI _CST\n");
+ return false;
+ }
+
+ for_each_possible_cpu(cpu) {
+ struct acpi_processor *pr = per_cpu(processors, cpu);
+
+ if (!pr)
+ continue;
+
+ if (acpi_processor_evaluate_cst(pr->handle, cpu, &acpi_state_table))
+ continue;
+
+ acpi_state_table.count++;
+
+ if (!intel_idle_cst_usable())
+ continue;
+
+ if (!acpi_processor_claim_cst_control())
+ break;
+
+ return true;
+ }
+
+ acpi_state_table.count = 0;
+ pr_debug("ACPI _CST not found or not usable\n");
+ return false;
+}
+
+static void __init intel_idle_init_cstates_acpi(struct cpuidle_driver *drv)
+{
+ int cstate, limit = min_t(int, CPUIDLE_STATE_MAX, acpi_state_table.count);
+
+ /*
+ * If limit > 0, intel_idle_cst_usable() has returned 'true', so all of
+ * the interesting states are ACPI_CSTATE_FFH.
+ */
+ for (cstate = 1; cstate < limit; cstate++) {
+ struct acpi_processor_cx *cx;
+ struct cpuidle_state *state;
+
+ if (intel_idle_max_cstate_reached(cstate - 1))
+ break;
+
+ cx = &acpi_state_table.states[cstate];
+
+ state = &drv->states[drv->state_count++];
+
+ snprintf(state->name, CPUIDLE_NAME_LEN, "C%d_ACPI", cstate);
+ strscpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
+ state->exit_latency = cx->latency;
+ /*
+ * For C1-type C-states use the same number for both the exit
+ * latency and target residency, because that is the case for
+ * C1 in the majority of the static C-states tables above.
+ * For the other types of C-states, however, set the target
+ * residency to 3 times the exit latency which should lead to
+ * a reasonable balance between energy-efficiency and
+ * performance in the majority of interesting cases.
+ */
+ state->target_residency = cx->latency;
+ if (cx->type > ACPI_STATE_C1)
+ state->target_residency *= 3;
+
+ state->flags = MWAIT2flg(cx->address);
+ if (cx->type > ACPI_STATE_C2)
+ state->flags |= CPUIDLE_FLAG_TLB_FLUSHED;
+
+ if (disabled_states_mask & BIT(cstate))
+ state->flags |= CPUIDLE_FLAG_OFF;
+
+ if (intel_idle_state_needs_timer_stop(state))
+ state->flags |= CPUIDLE_FLAG_TIMER_STOP;
+
+ state->enter = intel_idle;
+ state->enter_s2idle = intel_idle_s2idle;
+ }
+}
+
+static bool __init intel_idle_off_by_default(u32 mwait_hint)
+{
+ int cstate, limit;
+
+ /*
+ * If there are no _CST C-states, do not disable any C-states by
+ * default.
+ */
+ if (!acpi_state_table.count)
+ return false;
+
+ limit = min_t(int, CPUIDLE_STATE_MAX, acpi_state_table.count);
+ /*
+ * If limit > 0, intel_idle_cst_usable() has returned 'true', so all of
+ * the interesting states are ACPI_CSTATE_FFH.
+ */
+ for (cstate = 1; cstate < limit; cstate++) {
+ if (acpi_state_table.states[cstate].address == mwait_hint)
+ return false;
+ }
+ return true;
+}
+#else /* !CONFIG_ACPI_PROCESSOR_CSTATE */
+#define force_use_acpi (false)
+
+static inline bool intel_idle_acpi_cst_extract(void) { return false; }
+static inline void intel_idle_init_cstates_acpi(struct cpuidle_driver *drv) { }
+static inline bool intel_idle_off_by_default(u32 mwait_hint) { return false; }
+#endif /* !CONFIG_ACPI_PROCESSOR_CSTATE */
+
+/**
+ * ivt_idle_state_table_update - Tune the idle states table for Ivy Town.
+ *
+ * Tune IVT multi-socket targets.
+ * Assumption: num_sockets == (max_package_num + 1).
+ */
+static void __init ivt_idle_state_table_update(void)
+{
+ /* IVT uses a different table for 1-2, 3-4, and > 4 sockets */
+ int cpu, package_num, num_sockets = 1;
+
+ for_each_online_cpu(cpu) {
+ package_num = topology_physical_package_id(cpu);
+ if (package_num + 1 > num_sockets) {
+ num_sockets = package_num + 1;
+
+ if (num_sockets > 4) {
+ cpuidle_state_table = ivt_cstates_8s;
+ return;
+ }
+ }
+ }
+
+ if (num_sockets > 2)
+ cpuidle_state_table = ivt_cstates_4s;
+
+ /* else, 1 and 2 socket systems use default ivt_cstates */
+}
+
+/**
+ * irtl_2_usec - IRTL to microseconds conversion.
+ * @irtl: IRTL MSR value.
+ *
+ * Translate the IRTL (Interrupt Response Time Limit) MSR value to microseconds.
+ */
+static unsigned long long __init irtl_2_usec(unsigned long long irtl)
+{
+ static const unsigned int irtl_ns_units[] __initconst = {
+ 1, 32, 1024, 32768, 1048576, 33554432, 0, 0
+ };
+ unsigned long long ns;
+
+ if (!irtl)
+ return 0;
+
+ ns = irtl_ns_units[(irtl >> 10) & 0x7];
+
+ return div_u64((irtl & 0x3FF) * ns, NSEC_PER_USEC);
+}
+
+/**
+ * bxt_idle_state_table_update - Fix up the Broxton idle states table.
+ *
+ * On BXT, trust the IRTL (Interrupt Response Time Limit) MSR to show the
+ * definitive maximum latency and use the same value for target_residency.
+ */
+static void __init bxt_idle_state_table_update(void)
+{
+ unsigned long long msr;
+ unsigned int usec;
+
+ rdmsrl(MSR_PKGC6_IRTL, msr);
+ usec = irtl_2_usec(msr);
+ if (usec) {
+ bxt_cstates[2].exit_latency = usec;
+ bxt_cstates[2].target_residency = usec;
+ }
+
+ rdmsrl(MSR_PKGC7_IRTL, msr);
+ usec = irtl_2_usec(msr);
+ if (usec) {
+ bxt_cstates[3].exit_latency = usec;
+ bxt_cstates[3].target_residency = usec;
+ }
+
+ rdmsrl(MSR_PKGC8_IRTL, msr);
+ usec = irtl_2_usec(msr);
+ if (usec) {
+ bxt_cstates[4].exit_latency = usec;
+ bxt_cstates[4].target_residency = usec;
+ }
+
+ rdmsrl(MSR_PKGC9_IRTL, msr);
+ usec = irtl_2_usec(msr);
+ if (usec) {
+ bxt_cstates[5].exit_latency = usec;
+ bxt_cstates[5].target_residency = usec;
+ }
+
+ rdmsrl(MSR_PKGC10_IRTL, msr);
+ usec = irtl_2_usec(msr);
+ if (usec) {
+ bxt_cstates[6].exit_latency = usec;
+ bxt_cstates[6].target_residency = usec;
+ }
+
+}
+
+/**
+ * sklh_idle_state_table_update - Fix up the Sky Lake idle states table.
+ *
+ * On SKL-H (model 0x5e) skip C8 and C9 if C10 is enabled and SGX disabled.
+ */
+static void __init sklh_idle_state_table_update(void)
+{
+ unsigned long long msr;
+ unsigned int eax, ebx, ecx, edx;
+
+
+ /* if PC10 disabled via cmdline intel_idle.max_cstate=7 or shallower */
+ if (max_cstate <= 7)
+ return;
+
+ /* if PC10 not present in CPUID.MWAIT.EDX */
+ if ((mwait_substates & (0xF << 28)) == 0)
+ return;
+
+ rdmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr);
+
+ /* PC10 is not enabled in PKG C-state limit */
+ if ((msr & 0xF) != 8)
+ return;
+
+ ecx = 0;
+ cpuid(7, &eax, &ebx, &ecx, &edx);
+
+ /* if SGX is present */
+ if (ebx & (1 << 2)) {
+
+ rdmsrl(MSR_IA32_FEAT_CTL, msr);
+
+ /* if SGX is enabled */
+ if (msr & (1 << 18))
+ return;
+ }
+
+ skl_cstates[5].flags |= CPUIDLE_FLAG_UNUSABLE; /* C8-SKL */
+ skl_cstates[6].flags |= CPUIDLE_FLAG_UNUSABLE; /* C9-SKL */
+}
+
+/**
+ * skx_idle_state_table_update - Adjust the Sky Lake/Cascade Lake
+ * idle states table.
+ */
+static void __init skx_idle_state_table_update(void)
+{
+ unsigned long long msr;
+
+ rdmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr);
+
+ /*
+ * 000b: C0/C1 (no package C-state support)
+ * 001b: C2
+ * 010b: C6 (non-retention)
+ * 011b: C6 (retention)
+ * 111b: No Package C state limits.
+ */
+ if ((msr & 0x7) < 2) {
+ /*
+ * Uses the CC6 + PC0 latency and 3 times of
+ * latency for target_residency if the PC6
+ * is disabled in BIOS. This is consistent
+ * with how intel_idle driver uses _CST
+ * to set the target_residency.
+ */
+ skx_cstates[2].exit_latency = 92;
+ skx_cstates[2].target_residency = 276;
+ }
+}
+
+/**
+ * adl_idle_state_table_update - Adjust AlderLake idle states table.
+ */
+static void __init adl_idle_state_table_update(void)
+{
+ /* Check if user prefers C1 over C1E. */
+ if (preferred_states_mask & BIT(1) && !(preferred_states_mask & BIT(2))) {
+ cpuidle_state_table[0].flags &= ~CPUIDLE_FLAG_UNUSABLE;
+ cpuidle_state_table[1].flags |= CPUIDLE_FLAG_UNUSABLE;
+
+ /* Disable C1E by clearing the "C1E promotion" bit. */
+ c1e_promotion = C1E_PROMOTION_DISABLE;
+ return;
+ }
+
+ /* Make sure C1E is enabled by default */
+ c1e_promotion = C1E_PROMOTION_ENABLE;
+}
+
+/**
+ * spr_idle_state_table_update - Adjust Sapphire Rapids idle states table.
+ */
+static void __init spr_idle_state_table_update(void)
+{
+ unsigned long long msr;
+
+ /*
+ * By default, the C6 state assumes the worst-case scenario of package
+ * C6. However, if PC6 is disabled, we update the numbers to match
+ * core C6.
+ */
+ rdmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr);
+
+ /* Limit value 2 and above allow for PC6. */
+ if ((msr & 0x7) < 2) {
+ spr_cstates[2].exit_latency = 190;
+ spr_cstates[2].target_residency = 600;
+ }
+}
+
+static bool __init intel_idle_verify_cstate(unsigned int mwait_hint)
+{
+ unsigned int mwait_cstate = MWAIT_HINT2CSTATE(mwait_hint) + 1;
+ unsigned int num_substates = (mwait_substates >> mwait_cstate * 4) &
+ MWAIT_SUBSTATE_MASK;
+
+ /* Ignore the C-state if there are NO sub-states in CPUID for it. */
+ if (num_substates == 0)
+ return false;
+
+ if (mwait_cstate > 2 && !boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
+ mark_tsc_unstable("TSC halts in idle states deeper than C2");
+
+ return true;
+}
+
+static void __init intel_idle_init_cstates_icpu(struct cpuidle_driver *drv)
+{
+ int cstate;
+
+ switch (boot_cpu_data.x86_model) {
+ case INTEL_FAM6_IVYBRIDGE_X:
+ ivt_idle_state_table_update();
+ break;
+ case INTEL_FAM6_ATOM_GOLDMONT:
+ case INTEL_FAM6_ATOM_GOLDMONT_PLUS:
+ bxt_idle_state_table_update();
+ break;
+ case INTEL_FAM6_SKYLAKE:
+ sklh_idle_state_table_update();
+ break;
+ case INTEL_FAM6_SKYLAKE_X:
+ skx_idle_state_table_update();
+ break;
+ case INTEL_FAM6_SAPPHIRERAPIDS_X:
+ case INTEL_FAM6_EMERALDRAPIDS_X:
+ spr_idle_state_table_update();
+ break;
+ case INTEL_FAM6_ALDERLAKE:
+ case INTEL_FAM6_ALDERLAKE_L:
+ case INTEL_FAM6_ALDERLAKE_N:
+ adl_idle_state_table_update();
+ break;
+ }
+
+ for (cstate = 0; cstate < CPUIDLE_STATE_MAX; ++cstate) {
+ 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 (cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_IRQ_ENABLE)
+ drv->states[drv->state_count].enter = intel_idle_irq;
+
+ if (cpu_feature_enabled(X86_FEATURE_KERNEL_IBRS) &&
+ cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_IBRS) {
+ WARN_ON_ONCE(cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_IRQ_ENABLE);
+ drv->states[drv->state_count].enter = intel_idle_ibrs;
+ }
+
+ if (cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_INIT_XSTATE)
+ drv->states[drv->state_count].enter = intel_idle_xstate;
+
+ 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;
+
+ if (intel_idle_state_needs_timer_stop(&drv->states[drv->state_count]))
+ drv->states[drv->state_count].flags |= CPUIDLE_FLAG_TIMER_STOP;
+
+ drv->state_count++;
+ }
+
+ if (icpu->byt_auto_demotion_disable_flag) {
+ wrmsrl(MSR_CC6_DEMOTION_POLICY_CONFIG, 0);
+ wrmsrl(MSR_MC6_DEMOTION_POLICY_CONFIG, 0);
+ }
+}
+
+/**
+ * intel_idle_cpuidle_driver_init - Create the list of available idle states.
+ * @drv: cpuidle driver structure to initialize.
+ */
+static void __init intel_idle_cpuidle_driver_init(struct cpuidle_driver *drv)
+{
+ cpuidle_poll_state_init(drv);
+
+ if (disabled_states_mask & BIT(0))
+ drv->states[0].flags |= CPUIDLE_FLAG_OFF;
+
+ drv->state_count = 1;
+
+ if (icpu)
+ intel_idle_init_cstates_icpu(drv);
+ else
+ intel_idle_init_cstates_acpi(drv);
+}
+
+static void auto_demotion_disable(void)
+{
+ unsigned long long msr_bits;
+
+ rdmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr_bits);
+ msr_bits &= ~auto_demotion_disable_flags;
+ wrmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr_bits);
+}
+
+static void c1e_promotion_enable(void)
+{
+ unsigned long long msr_bits;
+
+ rdmsrl(MSR_IA32_POWER_CTL, msr_bits);
+ msr_bits |= 0x2;
+ wrmsrl(MSR_IA32_POWER_CTL, msr_bits);
+}
+
+static void c1e_promotion_disable(void)
+{
+ unsigned long long msr_bits;
+
+ rdmsrl(MSR_IA32_POWER_CTL, msr_bits);
+ msr_bits &= ~0x2;
+ wrmsrl(MSR_IA32_POWER_CTL, msr_bits);
+}
+
+/**
+ * intel_idle_cpu_init - Register the target CPU with the cpuidle core.
+ * @cpu: CPU to initialize.
+ *
+ * Register a cpuidle device object for @cpu and update its MSRs in accordance
+ * with the processor model flags.
+ */
+static int intel_idle_cpu_init(unsigned int cpu)
+{
+ struct cpuidle_device *dev;
+
+ dev = per_cpu_ptr(intel_idle_cpuidle_devices, cpu);
+ dev->cpu = cpu;
+
+ if (cpuidle_register_device(dev)) {
+ pr_debug("cpuidle_register_device %d failed!\n", cpu);
+ return -EIO;
+ }
+
+ if (auto_demotion_disable_flags)
+ auto_demotion_disable();
+
+ if (c1e_promotion == C1E_PROMOTION_ENABLE)
+ c1e_promotion_enable();
+ else if (c1e_promotion == C1E_PROMOTION_DISABLE)
+ c1e_promotion_disable();
+
+ return 0;
+}
+
+static int intel_idle_cpu_online(unsigned int cpu)
+{
+ struct cpuidle_device *dev;
+
+ if (!boot_cpu_has(X86_FEATURE_ARAT))
+ tick_broadcast_enable();
+
+ /*
+ * Some systems can hotplug a cpu at runtime after
+ * the kernel has booted, we have to initialize the
+ * driver in this case
+ */
+ dev = per_cpu_ptr(intel_idle_cpuidle_devices, cpu);
+ if (!dev->registered)
+ return intel_idle_cpu_init(cpu);
+
+ return 0;
+}
+
+/**
+ * intel_idle_cpuidle_devices_uninit - Unregister all cpuidle devices.
+ */
+static void __init intel_idle_cpuidle_devices_uninit(void)
+{
+ int i;
+
+ for_each_online_cpu(i)
+ cpuidle_unregister_device(per_cpu_ptr(intel_idle_cpuidle_devices, i));
+}
+
+static int __init intel_idle_init(void)
+{
+ const struct x86_cpu_id *id;
+ unsigned int eax, ebx, ecx;
+ int retval;
+
+ /* Do not load intel_idle at all for now if idle= is passed */
+ if (boot_option_idle_override != IDLE_NO_OVERRIDE)
+ return -ENODEV;
+
+ if (max_cstate == 0) {
+ pr_debug("disabled\n");
+ return -EPERM;
+ }
+
+ id = x86_match_cpu(intel_idle_ids);
+ if (id) {
+ if (!boot_cpu_has(X86_FEATURE_MWAIT)) {
+ pr_debug("Please enable MWAIT in BIOS SETUP\n");
+ return -ENODEV;
+ }
+ } else {
+ id = x86_match_cpu(intel_mwait_ids);
+ if (!id)
+ return -ENODEV;
+ }
+
+ if (boot_cpu_data.cpuid_level < CPUID_MWAIT_LEAF)
+ return -ENODEV;
+
+ cpuid(CPUID_MWAIT_LEAF, &eax, &ebx, &ecx, &mwait_substates);
+
+ if (!(ecx & CPUID5_ECX_EXTENSIONS_SUPPORTED) ||
+ !(ecx & CPUID5_ECX_INTERRUPT_BREAK) ||
+ !mwait_substates)
+ return -ENODEV;
+
+ pr_debug("MWAIT substates: 0x%x\n", mwait_substates);
+
+ icpu = (const struct idle_cpu *)id->driver_data;
+ if (icpu) {
+ cpuidle_state_table = icpu->state_table;
+ auto_demotion_disable_flags = icpu->auto_demotion_disable_flags;
+ if (icpu->disable_promotion_to_c1e)
+ c1e_promotion = C1E_PROMOTION_DISABLE;
+ if (icpu->use_acpi || force_use_acpi)
+ intel_idle_acpi_cst_extract();
+ } else if (!intel_idle_acpi_cst_extract()) {
+ return -ENODEV;
+ }
+
+ pr_debug("v" INTEL_IDLE_VERSION " model 0x%X\n",
+ boot_cpu_data.x86_model);
+
+ intel_idle_cpuidle_devices = alloc_percpu(struct cpuidle_device);
+ if (!intel_idle_cpuidle_devices)
+ return -ENOMEM;
+
+ intel_idle_cpuidle_driver_init(&intel_idle_driver);
+
+ retval = cpuidle_register_driver(&intel_idle_driver);
+ if (retval) {
+ struct cpuidle_driver *drv = cpuidle_get_driver();
+ printk(KERN_DEBUG pr_fmt("intel_idle yielding to %s\n"),
+ drv ? drv->name : "none");
+ goto init_driver_fail;
+ }
+
+ retval = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "idle/intel:online",
+ intel_idle_cpu_online, NULL);
+ if (retval < 0)
+ goto hp_setup_fail;
+
+ pr_debug("Local APIC timer is reliable in %s\n",
+ boot_cpu_has(X86_FEATURE_ARAT) ? "all C-states" : "C1");
+
+ return 0;
+
+hp_setup_fail:
+ intel_idle_cpuidle_devices_uninit();
+ cpuidle_unregister_driver(&intel_idle_driver);
+init_driver_fail:
+ free_percpu(intel_idle_cpuidle_devices);
+ return retval;
+
+}
+device_initcall(intel_idle_init);
+
+/*
+ * We are not really modular, but we used to support that. Meaning we also
+ * support "intel_idle.max_cstate=..." at boot and also a read-only export of
+ * it at /sys/module/intel_idle/parameters/max_cstate -- so using module_param
+ * is the easiest way (currently) to continue doing that.
+ */
+module_param(max_cstate, int, 0444);
+/*
+ * The positions of the bits that are set in this number are the indices of the
+ * idle states to be disabled by default (as reflected by the names of the
+ * corresponding idle state directories in sysfs, "state0", "state1" ...
+ * "state<i>" ..., where <i> is the index of the given state).
+ */
+module_param_named(states_off, disabled_states_mask, uint, 0444);
+MODULE_PARM_DESC(states_off, "Mask of disabled idle states");
+/*
+ * Some platforms come with mutually exclusive C-states, so that if one is
+ * enabled, the other C-states must not be used. Example: C1 and C1E on
+ * Sapphire Rapids platform. This parameter allows for selecting the
+ * preferred C-states among the groups of mutually exclusive C-states - the
+ * selected C-states will be registered, the other C-states from the mutually
+ * exclusive group won't be registered. If the platform has no mutually
+ * exclusive C-states, this parameter has no effect.
+ */
+module_param_named(preferred_cstates, preferred_states_mask, uint, 0444);
+MODULE_PARM_DESC(preferred_cstates, "Mask of preferred idle states");