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-rw-r--r--arch/arm/mach-omap2/cpuidle34xx.c2
-rw-r--r--arch/ia64/include/asm/processor.h5
-rw-r--r--arch/ia64/kernel/process.c6
-rw-r--r--arch/sh/kernel/cpu/shmobile/cpuidle.c1
-rw-r--r--arch/x86/include/asm/processor.h5
-rw-r--r--arch/x86/kernel/process.c24
-rw-r--r--drivers/acpi/processor_core.c4
-rw-r--r--drivers/acpi/processor_idle.c28
-rw-r--r--drivers/cpuidle/cpuidle.c82
-rw-r--r--drivers/idle/intel_idle.c67
-rw-r--r--include/linux/cpuidle.h6
11 files changed, 133 insertions, 97 deletions
diff --git a/arch/arm/mach-omap2/cpuidle34xx.c b/arch/arm/mach-omap2/cpuidle34xx.c
index f3e043f..5bdfc44 100644
--- a/arch/arm/mach-omap2/cpuidle34xx.c
+++ b/arch/arm/mach-omap2/cpuidle34xx.c
@@ -47,6 +47,8 @@
#define OMAP3_STATE_MAX OMAP3_STATE_C7
+#define CPUIDLE_FLAG_CHECK_BM 0x10000 /* use omap3_enter_idle_bm() */
+
struct omap3_processor_cx {
u8 valid;
u8 type;
diff --git a/arch/ia64/include/asm/processor.h b/arch/ia64/include/asm/processor.h
index 348e44d..03afe79 100644
--- a/arch/ia64/include/asm/processor.h
+++ b/arch/ia64/include/asm/processor.h
@@ -717,8 +717,9 @@ prefetchw (const void *x)
#define spin_lock_prefetch(x) prefetchw(x)
extern unsigned long boot_option_idle_override;
-extern unsigned long idle_halt;
-extern unsigned long idle_nomwait;
+
+enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_FORCE_MWAIT,
+ IDLE_NOMWAIT, IDLE_POLL};
#endif /* !__ASSEMBLY__ */
diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index 16f1c7b..6d33c5c 100644
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -53,12 +53,8 @@
void (*ia64_mark_idle)(int);
-unsigned long boot_option_idle_override = 0;
+unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE;
EXPORT_SYMBOL(boot_option_idle_override);
-unsigned long idle_halt;
-EXPORT_SYMBOL(idle_halt);
-unsigned long idle_nomwait;
-EXPORT_SYMBOL(idle_nomwait);
void (*pm_idle) (void);
EXPORT_SYMBOL(pm_idle);
void (*pm_power_off) (void);
diff --git a/arch/sh/kernel/cpu/shmobile/cpuidle.c b/arch/sh/kernel/cpu/shmobile/cpuidle.c
index 83972aa..c19e2a9 100644
--- a/arch/sh/kernel/cpu/shmobile/cpuidle.c
+++ b/arch/sh/kernel/cpu/shmobile/cpuidle.c
@@ -81,7 +81,6 @@ void sh_mobile_setup_cpuidle(void)
state->target_residency = 1 * 2;
state->power_usage = 3;
state->flags = 0;
- state->flags |= CPUIDLE_FLAG_SHALLOW;
state->flags |= CPUIDLE_FLAG_TIME_VALID;
state->enter = cpuidle_sleep_enter;
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index c6efecf..521acfc 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -761,10 +761,11 @@ extern void select_idle_routine(const struct cpuinfo_x86 *c);
extern void init_c1e_mask(void);
extern unsigned long boot_option_idle_override;
-extern unsigned long idle_halt;
-extern unsigned long idle_nomwait;
extern bool c1e_detected;
+enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_NOMWAIT,
+ IDLE_POLL, IDLE_FORCE_MWAIT};
+
extern void enable_sep_cpu(void);
extern int sysenter_setup(void);
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 09c08a1..7c23a0c 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -22,11 +22,6 @@
#include <asm/i387.h>
#include <asm/debugreg.h>
-unsigned long idle_halt;
-EXPORT_SYMBOL(idle_halt);
-unsigned long idle_nomwait;
-EXPORT_SYMBOL(idle_nomwait);
-
struct kmem_cache *task_xstate_cachep;
EXPORT_SYMBOL_GPL(task_xstate_cachep);
@@ -327,7 +322,7 @@ long sys_execve(const char __user *name,
/*
* Idle related variables and functions
*/
-unsigned long boot_option_idle_override = 0;
+unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE;
EXPORT_SYMBOL(boot_option_idle_override);
/*
@@ -503,7 +498,6 @@ static void poll_idle(void)
*
* idle=mwait overrides this decision and forces the usage of mwait.
*/
-static int __cpuinitdata force_mwait;
#define MWAIT_INFO 0x05
#define MWAIT_ECX_EXTENDED_INFO 0x01
@@ -513,7 +507,7 @@ static int __cpuinit mwait_usable(const struct cpuinfo_x86 *c)
{
u32 eax, ebx, ecx, edx;
- if (force_mwait)
+ if (boot_option_idle_override == IDLE_FORCE_MWAIT)
return 1;
if (c->cpuid_level < MWAIT_INFO)
@@ -633,9 +627,10 @@ static int __init idle_setup(char *str)
if (!strcmp(str, "poll")) {
printk("using polling idle threads.\n");
pm_idle = poll_idle;
- } else if (!strcmp(str, "mwait"))
- force_mwait = 1;
- else if (!strcmp(str, "halt")) {
+ boot_option_idle_override = IDLE_POLL;
+ } else if (!strcmp(str, "mwait")) {
+ boot_option_idle_override = IDLE_FORCE_MWAIT;
+ } else if (!strcmp(str, "halt")) {
/*
* When the boot option of idle=halt is added, halt is
* forced to be used for CPU idle. In such case CPU C2/C3
@@ -644,8 +639,7 @@ static int __init idle_setup(char *str)
* the boot_option_idle_override.
*/
pm_idle = default_idle;
- idle_halt = 1;
- return 0;
+ boot_option_idle_override = IDLE_HALT;
} else if (!strcmp(str, "nomwait")) {
/*
* If the boot option of "idle=nomwait" is added,
@@ -653,12 +647,10 @@ static int __init idle_setup(char *str)
* states. In such case it won't touch the variable
* of boot_option_idle_override.
*/
- idle_nomwait = 1;
- return 0;
+ boot_option_idle_override = IDLE_NOMWAIT;
} else
return -1;
- boot_option_idle_override = 1;
return 0;
}
early_param("idle", idle_setup);
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index bec561c..3c1a2fe 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -23,7 +23,7 @@ static int set_no_mwait(const struct dmi_system_id *id)
{
printk(KERN_NOTICE PREFIX "%s detected - "
"disabling mwait for CPU C-states\n", id->ident);
- idle_nomwait = 1;
+ boot_option_idle_override = IDLE_NOMWAIT;
return 0;
}
@@ -283,7 +283,7 @@ acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
{
acpi_status status = AE_OK;
- if (idle_nomwait) {
+ if (boot_option_idle_override == IDLE_NOMWAIT) {
/*
* If mwait is disabled for CPU C-states, the C2C3_FFH access
* mode will be disabled in the parameter of _PDC object.
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index a765b82..d615b7d 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -79,6 +79,13 @@ module_param(bm_check_disable, uint, 0000);
static unsigned int latency_factor __read_mostly = 2;
module_param(latency_factor, uint, 0644);
+static int disabled_by_idle_boot_param(void)
+{
+ return boot_option_idle_override == IDLE_POLL ||
+ boot_option_idle_override == IDLE_FORCE_MWAIT ||
+ boot_option_idle_override == IDLE_HALT;
+}
+
/*
* IBM ThinkPad R40e crashes mysteriously when going into C2 or C3.
* For now disable this. Probably a bug somewhere else.
@@ -455,7 +462,7 @@ static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
continue;
}
if (cx.type == ACPI_STATE_C1 &&
- (idle_halt || idle_nomwait)) {
+ (boot_option_idle_override == IDLE_NOMWAIT)) {
/*
* In most cases the C1 space_id obtained from
* _CST object is FIXED_HARDWARE access mode.
@@ -1016,7 +1023,6 @@ static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
state->flags = 0;
switch (cx->type) {
case ACPI_STATE_C1:
- state->flags |= CPUIDLE_FLAG_SHALLOW;
if (cx->entry_method == ACPI_CSTATE_FFH)
state->flags |= CPUIDLE_FLAG_TIME_VALID;
@@ -1025,16 +1031,13 @@ static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
break;
case ACPI_STATE_C2:
- state->flags |= CPUIDLE_FLAG_BALANCED;
state->flags |= CPUIDLE_FLAG_TIME_VALID;
state->enter = acpi_idle_enter_simple;
dev->safe_state = state;
break;
case ACPI_STATE_C3:
- state->flags |= CPUIDLE_FLAG_DEEP;
state->flags |= CPUIDLE_FLAG_TIME_VALID;
- state->flags |= CPUIDLE_FLAG_CHECK_BM;
state->enter = pr->flags.bm_check ?
acpi_idle_enter_bm :
acpi_idle_enter_simple;
@@ -1058,7 +1061,7 @@ int acpi_processor_cst_has_changed(struct acpi_processor *pr)
{
int ret = 0;
- if (boot_option_idle_override)
+ if (disabled_by_idle_boot_param())
return 0;
if (!pr)
@@ -1089,19 +1092,10 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
acpi_status status = 0;
static int first_run;
- if (boot_option_idle_override)
+ if (disabled_by_idle_boot_param())
return 0;
if (!first_run) {
- if (idle_halt) {
- /*
- * When the boot option of "idle=halt" is added, halt
- * is used for CPU IDLE.
- * In such case C2/C3 is meaningless. So the max_cstate
- * is set to one.
- */
- max_cstate = 1;
- }
dmi_check_system(processor_power_dmi_table);
max_cstate = acpi_processor_cstate_check(max_cstate);
if (max_cstate < ACPI_C_STATES_MAX)
@@ -1142,7 +1136,7 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
int acpi_processor_power_exit(struct acpi_processor *pr,
struct acpi_device *device)
{
- if (boot_option_idle_override)
+ if (disabled_by_idle_boot_param())
return 0;
cpuidle_unregister_device(&pr->power.dev);
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index 386888f..a2d5b95 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -155,6 +155,45 @@ void cpuidle_resume_and_unlock(void)
EXPORT_SYMBOL_GPL(cpuidle_resume_and_unlock);
+#ifdef CONFIG_ARCH_HAS_CPU_RELAX
+static int poll_idle(struct cpuidle_device *dev, struct cpuidle_state *st)
+{
+ ktime_t t1, t2;
+ s64 diff;
+ int ret;
+
+ t1 = ktime_get();
+ local_irq_enable();
+ while (!need_resched())
+ cpu_relax();
+
+ t2 = ktime_get();
+ diff = ktime_to_us(ktime_sub(t2, t1));
+ if (diff > INT_MAX)
+ diff = INT_MAX;
+
+ ret = (int) diff;
+ return ret;
+}
+
+static void poll_idle_init(struct cpuidle_device *dev)
+{
+ struct cpuidle_state *state = &dev->states[0];
+
+ cpuidle_set_statedata(state, NULL);
+
+ snprintf(state->name, CPUIDLE_NAME_LEN, "POLL");
+ snprintf(state->desc, CPUIDLE_DESC_LEN, "CPUIDLE CORE POLL IDLE");
+ state->exit_latency = 0;
+ state->target_residency = 0;
+ state->power_usage = -1;
+ state->flags = 0;
+ state->enter = poll_idle;
+}
+#else
+static void poll_idle_init(struct cpuidle_device *dev) {}
+#endif /* CONFIG_ARCH_HAS_CPU_RELAX */
+
/**
* cpuidle_enable_device - enables idle PM for a CPU
* @dev: the CPU
@@ -179,6 +218,8 @@ int cpuidle_enable_device(struct cpuidle_device *dev)
return ret;
}
+ poll_idle_init(dev);
+
if ((ret = cpuidle_add_state_sysfs(dev)))
return ret;
@@ -233,45 +274,6 @@ void cpuidle_disable_device(struct cpuidle_device *dev)
EXPORT_SYMBOL_GPL(cpuidle_disable_device);
-#ifdef CONFIG_ARCH_HAS_CPU_RELAX
-static int poll_idle(struct cpuidle_device *dev, struct cpuidle_state *st)
-{
- ktime_t t1, t2;
- s64 diff;
- int ret;
-
- t1 = ktime_get();
- local_irq_enable();
- while (!need_resched())
- cpu_relax();
-
- t2 = ktime_get();
- diff = ktime_to_us(ktime_sub(t2, t1));
- if (diff > INT_MAX)
- diff = INT_MAX;
-
- ret = (int) diff;
- return ret;
-}
-
-static void poll_idle_init(struct cpuidle_device *dev)
-{
- struct cpuidle_state *state = &dev->states[0];
-
- cpuidle_set_statedata(state, NULL);
-
- snprintf(state->name, CPUIDLE_NAME_LEN, "C0");
- snprintf(state->desc, CPUIDLE_DESC_LEN, "CPUIDLE CORE POLL IDLE");
- state->exit_latency = 0;
- state->target_residency = 0;
- state->power_usage = -1;
- state->flags = CPUIDLE_FLAG_POLL;
- state->enter = poll_idle;
-}
-#else
-static void poll_idle_init(struct cpuidle_device *dev) {}
-#endif /* CONFIG_ARCH_HAS_CPU_RELAX */
-
/**
* __cpuidle_register_device - internal register function called before register
* and enable routines
@@ -292,8 +294,6 @@ static int __cpuidle_register_device(struct cpuidle_device *dev)
init_completion(&dev->kobj_unregister);
- poll_idle_init(dev);
-
/*
* cpuidle driver should set the dev->power_specified bit
* before registering the device if the driver provides
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index 56ac09d..d14585b 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -59,6 +59,8 @@
#include <linux/hrtimer.h> /* ktime_get_real() */
#include <trace/events/power.h>
#include <linux/sched.h>
+#include <linux/notifier.h>
+#include <linux/cpu.h>
#include <asm/mwait.h>
#define INTEL_IDLE_VERSION "0.4"
@@ -73,6 +75,7 @@ static int max_cstate = MWAIT_MAX_NUM_CSTATES - 1;
static unsigned int mwait_substates;
+#define LAPIC_TIMER_ALWAYS_RELIABLE 0xFFFFFFFF
/* Reliable LAPIC Timer States, bit 1 for C1 etc. */
static unsigned int lapic_timer_reliable_states = (1 << 1); /* Default to only C1 */
@@ -82,6 +85,14 @@ static int intel_idle(struct cpuidle_device *dev, struct cpuidle_state *state);
static struct cpuidle_state *cpuidle_state_table;
/*
+ * Set this flag for states where the HW flushes the TLB for us
+ * and so we don't need cross-calls to keep it consistent.
+ * If this flag is set, SW flushes the TLB, so even if the
+ * HW doesn't do the flushing, this flag is safe to use.
+ */
+#define CPUIDLE_FLAG_TLB_FLUSHED 0x10000
+
+/*
* States are indexed by the cstate number,
* which is also the index into the MWAIT hint array.
* Thus C0 is a dummy.
@@ -122,7 +133,7 @@ static struct cpuidle_state snb_cstates[MWAIT_MAX_NUM_CSTATES] = {
.driver_data = (void *) 0x00,
.flags = CPUIDLE_FLAG_TIME_VALID,
.exit_latency = 1,
- .target_residency = 4,
+ .target_residency = 1,
.enter = &intel_idle },
{ /* MWAIT C2 */
.name = "SNB-C3",
@@ -130,7 +141,7 @@ static struct cpuidle_state snb_cstates[MWAIT_MAX_NUM_CSTATES] = {
.driver_data = (void *) 0x10,
.flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED,
.exit_latency = 80,
- .target_residency = 160,
+ .target_residency = 211,
.enter = &intel_idle },
{ /* MWAIT C3 */
.name = "SNB-C6",
@@ -138,7 +149,7 @@ static struct cpuidle_state snb_cstates[MWAIT_MAX_NUM_CSTATES] = {
.driver_data = (void *) 0x20,
.flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED,
.exit_latency = 104,
- .target_residency = 208,
+ .target_residency = 345,
.enter = &intel_idle },
{ /* MWAIT C4 */
.name = "SNB-C7",
@@ -146,7 +157,7 @@ static struct cpuidle_state snb_cstates[MWAIT_MAX_NUM_CSTATES] = {
.driver_data = (void *) 0x30,
.flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED,
.exit_latency = 109,
- .target_residency = 300,
+ .target_residency = 345,
.enter = &intel_idle },
};
@@ -243,6 +254,39 @@ static int intel_idle(struct cpuidle_device *dev, struct cpuidle_state *state)
return usec_delta;
}
+static void __setup_broadcast_timer(void *arg)
+{
+ unsigned long reason = (unsigned long)arg;
+ int cpu = smp_processor_id();
+
+ reason = reason ?
+ CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF;
+
+ clockevents_notify(reason, &cpu);
+}
+
+static int __cpuinit setup_broadcast_cpuhp_notify(struct notifier_block *n,
+ unsigned long action, void *hcpu)
+{
+ int hotcpu = (unsigned long)hcpu;
+
+ switch (action & 0xf) {
+ case CPU_ONLINE:
+ smp_call_function_single(hotcpu, __setup_broadcast_timer,
+ (void *)true, 1);
+ break;
+ case CPU_DOWN_PREPARE:
+ smp_call_function_single(hotcpu, __setup_broadcast_timer,
+ (void *)false, 1);
+ break;
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata setup_broadcast_notifier = {
+ .notifier_call = setup_broadcast_cpuhp_notify,
+};
+
/*
* intel_idle_probe()
*/
@@ -305,7 +349,11 @@ static int intel_idle_probe(void)
}
if (boot_cpu_has(X86_FEATURE_ARAT)) /* Always Reliable APIC Timer */
- lapic_timer_reliable_states = 0xFFFFFFFF;
+ lapic_timer_reliable_states = LAPIC_TIMER_ALWAYS_RELIABLE;
+ else {
+ smp_call_function(__setup_broadcast_timer, (void *)true, 1);
+ register_cpu_notifier(&setup_broadcast_notifier);
+ }
pr_debug(PREFIX "v" INTEL_IDLE_VERSION
" model 0x%X\n", boot_cpu_data.x86_model);
@@ -403,6 +451,10 @@ 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;
@@ -428,6 +480,11 @@ static void __exit intel_idle_exit(void)
intel_idle_cpuidle_devices_uninit();
cpuidle_unregister_driver(&intel_idle_driver);
+ if (lapic_timer_reliable_states != LAPIC_TIMER_ALWAYS_RELIABLE) {
+ smp_call_function(__setup_broadcast_timer, (void *)false, 1);
+ unregister_cpu_notifier(&setup_broadcast_notifier);
+ }
+
return;
}
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index 1be416b..36719ea 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -47,13 +47,7 @@ struct cpuidle_state {
/* Idle State Flags */
#define CPUIDLE_FLAG_TIME_VALID (0x01) /* is residency time measurable? */
-#define CPUIDLE_FLAG_CHECK_BM (0x02) /* BM activity will exit state */
-#define CPUIDLE_FLAG_POLL (0x10) /* no latency, no savings */
-#define CPUIDLE_FLAG_SHALLOW (0x20) /* low latency, minimal savings */
-#define CPUIDLE_FLAG_BALANCED (0x40) /* medium latency, moderate savings */
-#define CPUIDLE_FLAG_DEEP (0x80) /* high latency, large savings */
#define CPUIDLE_FLAG_IGNORE (0x100) /* ignore during this idle period */
-#define CPUIDLE_FLAG_TLB_FLUSHED (0x200) /* tlb will be flushed */
#define CPUIDLE_DRIVER_FLAGS_MASK (0xFFFF0000)
generated by cgit v0.10.2 at 2024-11-21 09:36:40 (GMT)