Merge tag 'suspend-to-idle-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull suspend-to-idle updates from Rafael Wysocki:
 "Suspend-to-idle timer quiescing support for v3.20-rc1

  Until now suspend-to-idle has not been able to save much more energy
  than runtime PM because of timer interrupts that periodically bring
  CPUs out of idle while they are waiting for a wakeup interrupt.  Of
  course, the timer interrupts are not wakeup ones, so the handling of
  them can be deferred until a real wakeup interrupt happens, but at the
  same time we don't want to mass-expire timers at that point.

  The solution is to suspend the entire timekeeping when the last CPU is
  entering an idle state and resume it when the first CPU goes out of
  idle.  That has to be done with care, though, so as to avoid accessing
  suspended clocksources etc.  end we need extra support from idle
  drivers for that.

  This series of commits adds support for quiescing timers during
  suspend-to-idle and adds the requisite callbacks to intel_idle and the
  ACPI cpuidle driver"

* tag 'suspend-to-idle-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI / idle: Implement ->enter_freeze callback routine
  intel_idle: Add ->enter_freeze callbacks
  PM / sleep: Make it possible to quiesce timers during suspend-to-idle
  timekeeping: Make it safe to use the fast timekeeper while suspended
  timekeeping: Pass readout base to update_fast_timekeeper()
  PM / sleep: Re-implement suspend-to-idle handling

1 files changed, 125 insertions, 54 deletions

diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index 1bc0c170f12a..b0e58522780d 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -97,6 +97,8 @@ static const struct idle_cpu *icpu;
 static struct cpuidle_device __percpu *intel_idle_cpuidle_devices;
 static int intel_idle(struct cpuidle_device *dev,
 			struct cpuidle_driver *drv, int index);
+static void intel_idle_freeze(struct cpuidle_device *dev,
+			      struct cpuidle_driver *drv, int index);
 static int intel_idle_cpu_init(int cpu);
 
 static struct cpuidle_state *cpuidle_state_table;
@@ -131,28 +133,32 @@ static struct cpuidle_state nehalem_cstates[] = {
 		.flags = MWAIT2flg(0x00),
 		.exit_latency = 3,
 		.target_residency = 6,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C1E-NHM",
 		.desc = "MWAIT 0x01",
 		.flags = MWAIT2flg(0x01),
 		.exit_latency = 10,
 		.target_residency = 20,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C3-NHM",
 		.desc = "MWAIT 0x10",
 		.flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 20,
 		.target_residency = 80,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C6-NHM",
 		.desc = "MWAIT 0x20",
 		.flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 200,
 		.target_residency = 800,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.enter = NULL }
 };
@@ -164,35 +170,40 @@ static struct cpuidle_state snb_cstates[] = {
 		.flags = MWAIT2flg(0x00),
 		.exit_latency = 2,
 		.target_residency = 2,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C1E-SNB",
 		.desc = "MWAIT 0x01",
 		.flags = MWAIT2flg(0x01),
 		.exit_latency = 10,
 		.target_residency = 20,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C3-SNB",
 		.desc = "MWAIT 0x10",
 		.flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 80,
 		.target_residency = 211,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C6-SNB",
 		.desc = "MWAIT 0x20",
 		.flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 104,
 		.target_residency = 345,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C7-SNB",
 		.desc = "MWAIT 0x30",
 		.flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 109,
 		.target_residency = 345,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.enter = NULL }
 };
@@ -204,42 +215,48 @@ static struct cpuidle_state byt_cstates[] = {
 		.flags = MWAIT2flg(0x00),
 		.exit_latency = 1,
 		.target_residency = 1,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C1E-BYT",
 		.desc = "MWAIT 0x01",
 		.flags = MWAIT2flg(0x01),
 		.exit_latency = 15,
 		.target_residency = 30,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C6N-BYT",
 		.desc = "MWAIT 0x58",
 		.flags = MWAIT2flg(0x58) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 40,
 		.target_residency = 275,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C6S-BYT",
 		.desc = "MWAIT 0x52",
 		.flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 140,
 		.target_residency = 560,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C7-BYT",
 		.desc = "MWAIT 0x60",
 		.flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 1200,
 		.target_residency = 1500,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C7S-BYT",
 		.desc = "MWAIT 0x64",
 		.flags = MWAIT2flg(0x64) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 10000,
 		.target_residency = 20000,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.enter = NULL }
 };
@@ -251,35 +268,40 @@ static struct cpuidle_state ivb_cstates[] = {
 		.flags = MWAIT2flg(0x00),
 		.exit_latency = 1,
 		.target_residency = 1,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C1E-IVB",
 		.desc = "MWAIT 0x01",
 		.flags = MWAIT2flg(0x01),
 		.exit_latency = 10,
 		.target_residency = 20,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C3-IVB",
 		.desc = "MWAIT 0x10",
 		.flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 59,
 		.target_residency = 156,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C6-IVB",
 		.desc = "MWAIT 0x20",
 		.flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 80,
 		.target_residency = 300,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C7-IVB",
 		.desc = "MWAIT 0x30",
 		.flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 87,
 		.target_residency = 300,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.enter = NULL }
 };
@@ -291,28 +313,32 @@ static struct cpuidle_state ivt_cstates[] = {
 		.flags = MWAIT2flg(0x00),
 		.exit_latency = 1,
 		.target_residency = 1,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C1E-IVT",
 		.desc = "MWAIT 0x01",
 		.flags = MWAIT2flg(0x01),
 		.exit_latency = 10,
 		.target_residency = 80,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C3-IVT",
 		.desc = "MWAIT 0x10",
 		.flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 59,
 		.target_residency = 156,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C6-IVT",
 		.desc = "MWAIT 0x20",
 		.flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 82,
 		.target_residency = 300,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.enter = NULL }
 };
@@ -324,28 +350,32 @@ static struct cpuidle_state ivt_cstates_4s[] = {
 		.flags = MWAIT2flg(0x00),
 		.exit_latency = 1,
 		.target_residency = 1,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C1E-IVT-4S",
 		.desc = "MWAIT 0x01",
 		.flags = MWAIT2flg(0x01),
 		.exit_latency = 10,
 		.target_residency = 250,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C3-IVT-4S",
 		.desc = "MWAIT 0x10",
 		.flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 59,
 		.target_residency = 300,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C6-IVT-4S",
 		.desc = "MWAIT 0x20",
 		.flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 84,
 		.target_residency = 400,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.enter = NULL }
 };
@@ -357,28 +387,32 @@ static struct cpuidle_state ivt_cstates_8s[] = {
 		.flags = MWAIT2flg(0x00),
 		.exit_latency = 1,
 		.target_residency = 1,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C1E-IVT-8S",
 		.desc = "MWAIT 0x01",
 		.flags = MWAIT2flg(0x01),
 		.exit_latency = 10,
 		.target_residency = 500,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C3-IVT-8S",
 		.desc = "MWAIT 0x10",
 		.flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 59,
 		.target_residency = 600,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C6-IVT-8S",
 		.desc = "MWAIT 0x20",
 		.flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 88,
 		.target_residency = 700,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.enter = NULL }
 };
@@ -390,56 +424,64 @@ static struct cpuidle_state hsw_cstates[] = {
 		.flags = MWAIT2flg(0x00),
 		.exit_latency = 2,
 		.target_residency = 2,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C1E-HSW",
 		.desc = "MWAIT 0x01",
 		.flags = MWAIT2flg(0x01),
 		.exit_latency = 10,
 		.target_residency = 20,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C3-HSW",
 		.desc = "MWAIT 0x10",
 		.flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 33,
 		.target_residency = 100,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C6-HSW",
 		.desc = "MWAIT 0x20",
 		.flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 133,
 		.target_residency = 400,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C7s-HSW",
 		.desc = "MWAIT 0x32",
 		.flags = MWAIT2flg(0x32) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 166,
 		.target_residency = 500,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C8-HSW",
 		.desc = "MWAIT 0x40",
 		.flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 300,
 		.target_residency = 900,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C9-HSW",
 		.desc = "MWAIT 0x50",
 		.flags = MWAIT2flg(0x50) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 600,
 		.target_residency = 1800,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C10-HSW",
 		.desc = "MWAIT 0x60",
 		.flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 2600,
 		.target_residency = 7700,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.enter = NULL }
 };
@@ -450,56 +492,64 @@ static struct cpuidle_state bdw_cstates[] = {
 		.flags = MWAIT2flg(0x00),
 		.exit_latency = 2,
 		.target_residency = 2,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C1E-BDW",
 		.desc = "MWAIT 0x01",
 		.flags = MWAIT2flg(0x01),
 		.exit_latency = 10,
 		.target_residency = 20,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C3-BDW",
 		.desc = "MWAIT 0x10",
 		.flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 40,
 		.target_residency = 100,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C6-BDW",
 		.desc = "MWAIT 0x20",
 		.flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 133,
 		.target_residency = 400,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C7s-BDW",
 		.desc = "MWAIT 0x32",
 		.flags = MWAIT2flg(0x32) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 166,
 		.target_residency = 500,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C8-BDW",
 		.desc = "MWAIT 0x40",
 		.flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 300,
 		.target_residency = 900,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C9-BDW",
 		.desc = "MWAIT 0x50",
 		.flags = MWAIT2flg(0x50) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 600,
 		.target_residency = 1800,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C10-BDW",
 		.desc = "MWAIT 0x60",
 		.flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 2600,
 		.target_residency = 7700,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.enter = NULL }
 };
@@ -511,28 +561,32 @@ static struct cpuidle_state atom_cstates[] = {
 		.flags = MWAIT2flg(0x00),
 		.exit_latency = 10,
 		.target_residency = 20,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C2-ATM",
 		.desc = "MWAIT 0x10",
 		.flags = MWAIT2flg(0x10),
 		.exit_latency = 20,
 		.target_residency = 80,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C4-ATM",
 		.desc = "MWAIT 0x30",
 		.flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 100,
 		.target_residency = 400,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C6-ATM",
 		.desc = "MWAIT 0x52",
 		.flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 140,
 		.target_residency = 560,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.enter = NULL }
 };
@@ -543,14 +597,16 @@ static struct cpuidle_state avn_cstates[] = {
 		.flags = MWAIT2flg(0x00),
 		.exit_latency = 2,
 		.target_residency = 2,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.name = "C6-AVN",
 		.desc = "MWAIT 0x51",
 		.flags = MWAIT2flg(0x51) | CPUIDLE_FLAG_TLB_FLUSHED,
 		.exit_latency = 15,
 		.target_residency = 45,
-		.enter = &intel_idle },
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
 	{
 		.enter = NULL }
 };
@@ -592,6 +648,21 @@ static int intel_idle(struct cpuidle_device *dev,
 	return index;
 }
 
+/**
+ * intel_idle_freeze - simplified "enter" callback routine for suspend-to-idle
+ * @dev: cpuidle_device
+ * @drv: cpuidle driver
+ * @index: state index
+ */
+static void intel_idle_freeze(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(void *arg)
 {
 	unsigned long reason = (unsigned long)arg;