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-rw-r--r--drivers/idle/Kconfig3
-rw-r--r--[-rwxr-xr-x]drivers/idle/intel_idle.c104
2 files changed, 29 insertions, 78 deletions
diff --git a/drivers/idle/Kconfig b/drivers/idle/Kconfig
index fb5c5186d4aa..8489eb58a52c 100644
--- a/drivers/idle/Kconfig
+++ b/drivers/idle/Kconfig
@@ -1,9 +1,8 @@
config INTEL_IDLE
- tristate "Cpuidle Driver for Intel Processors"
+ bool "Cpuidle Driver for Intel Processors"
depends on CPU_IDLE
depends on X86
depends on CPU_SUP_INTEL
- depends on EXPERIMENTAL
help
Enable intel_idle, a cpuidle driver that includes knowledge of
native Intel hardware idle features. The acpi_idle driver
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index 84476be69b38..d310590598f9 100755..100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -77,15 +77,13 @@ static struct cpuidle_driver intel_idle_driver = {
};
/* intel_idle.max_cstate=0 disables driver */
static int max_cstate = MWAIT_MAX_NUM_CSTATES - 1;
-static int power_policy = 7; /* 0 = max perf; 15 = max powersave */
-static unsigned int substates;
-static int (*choose_substate)(int);
+static unsigned int mwait_substates;
/* Reliable LAPIC Timer States, bit 1 for C1 etc. */
static unsigned int lapic_timer_reliable_states = (1 << 1); /* Default to only C1 */
-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;
@@ -103,25 +101,22 @@ static struct cpuidle_state nehalem_cstates[MWAIT_MAX_NUM_CSTATES] = {
.driver_data = (void *) 0x00,
.flags = CPUIDLE_FLAG_TIME_VALID,
.exit_latency = 3,
- .power_usage = 1000,
.target_residency = 6,
.enter = &intel_idle },
{ /* MWAIT C2 */
.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,
.enter = &intel_idle },
{ /* MWAIT C3 */
.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,
.enter = &intel_idle },
};
@@ -140,7 +135,7 @@ static struct cpuidle_state snb_cstates[MWAIT_MAX_NUM_CSTATES] = {
.name = "SNB-C3",
.desc = "MWAIT 0x10",
.driver_data = (void *) 0x10,
- .flags = CPUIDLE_FLAG_TIME_VALID,
+ .flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED,
.exit_latency = 80,
.target_residency = 160,
.enter = &intel_idle },
@@ -148,7 +143,7 @@ static struct cpuidle_state snb_cstates[MWAIT_MAX_NUM_CSTATES] = {
.name = "SNB-C6",
.desc = "MWAIT 0x20",
.driver_data = (void *) 0x20,
- .flags = CPUIDLE_FLAG_TIME_VALID,
+ .flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED,
.exit_latency = 104,
.target_residency = 208,
.enter = &intel_idle },
@@ -156,7 +151,7 @@ static struct cpuidle_state snb_cstates[MWAIT_MAX_NUM_CSTATES] = {
.name = "SNB-C7",
.desc = "MWAIT 0x30",
.driver_data = (void *) 0x30,
- .flags = CPUIDLE_FLAG_TIME_VALID,
+ .flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED,
.exit_latency = 109,
.target_residency = 300,
.enter = &intel_idle },
@@ -170,7 +165,6 @@ static struct cpuidle_state atom_cstates[MWAIT_MAX_NUM_CSTATES] = {
.driver_data = (void *) 0x00,
.flags = CPUIDLE_FLAG_TIME_VALID,
.exit_latency = 1,
- .power_usage = 1000,
.target_residency = 4,
.enter = &intel_idle },
{ /* MWAIT C2 */
@@ -179,7 +173,6 @@ static struct cpuidle_state atom_cstates[MWAIT_MAX_NUM_CSTATES] = {
.driver_data = (void *) 0x10,
.flags = CPUIDLE_FLAG_TIME_VALID,
.exit_latency = 20,
- .power_usage = 500,
.target_residency = 80,
.enter = &intel_idle },
{ /* MWAIT C3 */ },
@@ -187,58 +180,21 @@ 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,
.enter = &intel_idle },
{ /* MWAIT C5 */ },
{ /* MWAIT C6 */
.name = "ATM-C6",
- .desc = "MWAIT 0x40",
- .driver_data = (void *) 0x40,
- .flags = CPUIDLE_FLAG_TIME_VALID,
- .exit_latency = 200,
- .power_usage = 150,
- .target_residency = 800,
- .enter = NULL }, /* disabled */
+ .desc = "MWAIT 0x52",
+ .driver_data = (void *) 0x52,
+ .flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 140,
+ .target_residency = 560,
+ .enter = &intel_idle },
};
-/*
- * choose_tunable_substate()
- *
- * Run-time decision on which C-state substate to invoke
- * If power_policy = 0, choose shallowest substate (0)
- * If power_policy = 15, choose deepest substate
- * If power_policy = middle, choose middle substate etc.
- */
-static int choose_tunable_substate(int cstate)
-{
- unsigned int num_substates;
- unsigned int substate_choice;
-
- power_policy &= 0xF; /* valid range: 0-15 */
- cstate &= 7; /* valid range: 0-7 */
-
- num_substates = (substates >> ((cstate) * 4)) & MWAIT_SUBSTATE_MASK;
-
- if (num_substates <= 1)
- return 0;
-
- substate_choice = ((power_policy + (power_policy + 1) *
- (num_substates - 1)) / 16);
-
- return substate_choice;
-}
-
-/*
- * choose_zero_substate()
- */
-static int choose_zero_substate(int cstate)
-{
- return 0;
-}
-
/**
* intel_idle
* @dev: cpuidle_device
@@ -256,10 +212,15 @@ static int intel_idle(struct cpuidle_device *dev, struct cpuidle_state *state)
cstate = (((eax) >> MWAIT_SUBSTATE_SIZE) & MWAIT_CSTATE_MASK) + 1;
- eax = eax + (choose_substate)(cstate);
-
local_irq_disable();
+ /*
+ * 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))))
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &cpu);
@@ -267,7 +228,7 @@ static int intel_idle(struct cpuidle_device *dev, struct cpuidle_state *state)
stop_critical_timings();
#ifndef MODULE
- trace_power_start(POWER_CSTATE, (eax >> 4) + 1);
+ trace_power_start(POWER_CSTATE, (eax >> 4) + 1, cpu);
#endif
if (!need_resched()) {
@@ -295,7 +256,7 @@ static int intel_idle(struct cpuidle_device *dev, struct cpuidle_state *state)
*/
static int intel_idle_probe(void)
{
- unsigned int eax, ebx, ecx, edx;
+ unsigned int eax, ebx, ecx;
if (max_cstate == 0) {
pr_debug(PREFIX "disabled\n");
@@ -311,17 +272,13 @@ static int intel_idle_probe(void)
if (boot_cpu_data.cpuid_level < CPUID_MWAIT_LEAF)
return -ENODEV;
- cpuid(CPUID_MWAIT_LEAF, &eax, &ebx, &ecx, &edx);
+ cpuid(CPUID_MWAIT_LEAF, &eax, &ebx, &ecx, &mwait_substates);
if (!(ecx & CPUID5_ECX_EXTENSIONS_SUPPORTED) ||
!(ecx & CPUID5_ECX_INTERRUPT_BREAK))
return -ENODEV;
-#ifdef DEBUG
- if (substates == 0) /* can over-ride via modparam */
-#endif
- substates = edx;
- pr_debug(PREFIX "MWAIT substates: 0x%x\n", substates);
+ pr_debug(PREFIX "MWAIT substates: 0x%x\n", mwait_substates);
if (boot_cpu_has(X86_FEATURE_ARAT)) /* Always Reliable APIC Timer */
lapic_timer_reliable_states = 0xFFFFFFFF;
@@ -335,24 +292,23 @@ static int intel_idle_probe(void)
case 0x1E: /* Core i7 and i5 Processor - Lynnfield Jasper Forest */
case 0x1F: /* Core i7 and i5 Processor - Nehalem */
case 0x2E: /* Nehalem-EX Xeon */
+ case 0x2F: /* Westmere-EX Xeon */
lapic_timer_reliable_states = (1 << 1); /* C1 */
case 0x25: /* Westmere */
case 0x2C: /* Westmere */
cpuidle_state_table = nehalem_cstates;
- choose_substate = choose_tunable_substate;
break;
case 0x1C: /* 28 - Atom Processor */
+ case 0x26: /* 38 - Lincroft Atom Processor */
lapic_timer_reliable_states = (1 << 2) | (1 << 1); /* C2, C1 */
cpuidle_state_table = atom_cstates;
- choose_substate = choose_zero_substate;
break;
case 0x2A: /* SNB */
case 0x2D: /* SNB Xeon */
cpuidle_state_table = snb_cstates;
- choose_substate = choose_zero_substate;
break;
#ifdef FUTURE_USE
case 0x17: /* 23 - Core 2 Duo */
@@ -418,7 +374,7 @@ static int intel_idle_cpuidle_devices_init(void)
}
/* does the state exist in CPUID.MWAIT? */
- num_substates = (substates >> ((cstate) * 4))
+ num_substates = (mwait_substates >> ((cstate) * 4))
& MWAIT_SUBSTATE_MASK;
if (num_substates == 0)
continue;
@@ -492,11 +448,7 @@ static void __exit intel_idle_exit(void)
module_init(intel_idle_init);
module_exit(intel_idle_exit);
-module_param(power_policy, int, 0644);
module_param(max_cstate, int, 0444);
-#ifdef DEBUG
-module_param(substates, int, 0444);
-#endif
MODULE_AUTHOR("Len Brown <len.brown@intel.com>");
MODULE_DESCRIPTION("Cpuidle driver for Intel Hardware v" INTEL_IDLE_VERSION);
generated by cgit v1.2.3 (git 2.0.4) at 2024-07-09 09:26:39 +0000