1 files changed, 21 insertions, 18 deletions

diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index a10152bb1427..cb3ccf3ed221 100755..100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -59,18 +59,11 @@
 #include <linux/hrtimer.h>      /* ktime_get_real() */
 #include <trace/events/power.h>
 #include <linux/sched.h>
+#include <asm/mwait.h>
 
 #define INTEL_IDLE_VERSION "0.4"
 #define PREFIX "intel_idle: "
 
-#define MWAIT_SUBSTATE_MASK     (0xf)
-#define MWAIT_CSTATE_MASK       (0xf)
-#define MWAIT_SUBSTATE_SIZE     (4)
-#define MWAIT_MAX_NUM_CSTATES   8
-#define CPUID_MWAIT_LEAF (5)
-#define CPUID5_ECX_EXTENSIONS_SUPPORTED (0x1)
-#define CPUID5_ECX_INTERRUPT_BREAK      (0x2)
-
 static struct cpuidle_driver intel_idle_driver = {
         .name = "intel_idle",
         .owner = THIS_MODULE,
@@ -83,7 +76,7 @@ static unsigned int mwait_substates;
 /* Reliable LAPIC Timer States, bit 1 for C1 etc.  */
 static unsigned int lapic_timer_reliable_states;
 
-static struct cpuidle_device *intel_idle_cpuidle_devices;
+static struct cpuidle_device __percpu *intel_idle_cpuidle_devices;
 static int intel_idle(struct cpuidle_device *dev, struct cpuidle_state *state);
 
 static struct cpuidle_state *cpuidle_state_table;
@@ -108,7 +101,7 @@ static struct cpuidle_state nehalem_cstates[MWAIT_MAX_NUM_CSTATES] = {
                 .name = "NHM-C3",
                 .desc = "MWAIT 0x10",
                 .driver_data = (void *) 0x10,
-                .flags = CPUIDLE_FLAG_TIME_VALID,
+                .flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED,
                 .exit_latency = 20,
                 .power_usage = 500,
                 .target_residency = 80,
@@ -117,7 +110,7 @@ static struct cpuidle_state nehalem_cstates[MWAIT_MAX_NUM_CSTATES] = {
                 .name = "NHM-C6",
                 .desc = "MWAIT 0x20",
                 .driver_data = (void *) 0x20,
-                .flags = CPUIDLE_FLAG_TIME_VALID,
+                .flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED,
                 .exit_latency = 200,
                 .power_usage = 350,
                 .target_residency = 800,
@@ -149,7 +142,7 @@ static struct cpuidle_state atom_cstates[MWAIT_MAX_NUM_CSTATES] = {
                 .name = "ATM-C4",
                 .desc = "MWAIT 0x30",
                 .driver_data = (void *) 0x30,
-                .flags = CPUIDLE_FLAG_TIME_VALID,
+                .flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED,
                 .exit_latency = 100,
                 .power_usage = 250,
                 .target_residency = 400,
@@ -157,13 +150,13 @@ static struct cpuidle_state atom_cstates[MWAIT_MAX_NUM_CSTATES] = {
         { /* MWAIT C5 */ },
         { /* MWAIT C6 */
                 .name = "ATM-C6",
-                .desc = "MWAIT 0x40",
-                .driver_data = (void *) 0x40,
-                .flags = CPUIDLE_FLAG_TIME_VALID,
-                .exit_latency = 200,
+                .desc = "MWAIT 0x52",
+                .driver_data = (void *) 0x52,
+                .flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED,
+                .exit_latency = 140,
                 .power_usage = 150,
-                .target_residency = 800,
-                .enter = NULL },        /* disabled */
+                .target_residency = 560,
+                .enter = &intel_idle },
 };
 
 /**
@@ -185,6 +178,16 @@ static int intel_idle(struct cpuidle_device *dev, struct cpuidle_state *state)
 
         local_irq_disable();
 
+        /*
+         * If the state flag indicates that the TLB will be flushed or if this
+         * is the deepest c-state supported, do a voluntary leave mm to avoid
+         * costly and mostly unnecessary wakeups for flushing the user TLB's
+         * associated with the active mm.
+         */
+        if (state->flags & CPUIDLE_FLAG_TLB_FLUSHED ||
+            (&dev->states[dev->state_count - 1] == state))
+                leave_mm(cpu);
+
         if (!(lapic_timer_reliable_states & (1 << (cstate))))
                 clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &cpu);