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cpuidle: Single/Global registration of idle states

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This patch makes the cpuidle_states structure global (single copy)
instead of per-cpu. The statistics needed on per-cpu basis
by the governor are kept per-cpu. This simplifies the cpuidle
subsystem as state registration is done by single cpu only.
Having single copy of cpuidle_states saves memory. Rare case
of asymmetric C-states can be handled within the cpuidle driver
and architectures such as POWER do not have asymmetric C-states.

Having single/global registration of all the idle states,
dynamic C-state transitions on x86 are handled by
the boot cpu. Here, the boot cpu  would disable all the devices,
re-populate the states and later enable all the devices,
irrespective of the cpu that would receive the notification first.

Reference:
https://lkml.org/lkml/2011/4/25/83

Signed-off-by: Deepthi Dharwar <deepthi@linux.vnet.ibm.com>
Signed-off-by: Trinabh Gupta <g.trinabh@gmail.com>
Tested-by: Jean Pihet <j-pihet@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Deepthi Dharwar 2011-10-28 16:20:42 +05:30 • committed by Len Brown
commit 46bcfad7a8
16 changed files with 438 additions and 206 deletions
Download patch file Download diff file Expand all files Collapse all files

31
arch/arm/mach-at91/cpuidle.c
View file

@ -33,6 +33,7 @@ static struct cpuidle_driver at91_idle_driver = {
/* Actual code that puts the SoC in different idle states */
static int at91_enter_idle(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
struct timeval before, after;
@ -64,27 +65,29 @@ static int at91_enter_idle(struct cpuidle_device *dev,
static int at91_init_cpuidle(void)
{
struct cpuidle_device *device;
cpuidle_register_driver(&at91_idle_driver);
struct cpuidle_driver *driver = &at91_idle_driver;
device = &per_cpu(at91_cpuidle_device, smp_processor_id());
device->state_count = AT91_MAX_STATES;
driver->state_count = AT91_MAX_STATES;
/* Wait for interrupt state */
device->states[0].enter = at91_enter_idle;
device->states[0].exit_latency = 1;
device->states[0].target_residency = 10000;
device->states[0].flags = CPUIDLE_FLAG_TIME_VALID;
strcpy(device->states[0].name, "WFI");
strcpy(device->states[0].desc, "Wait for interrupt");
driver->states[0].enter = at91_enter_idle;
driver->states[0].exit_latency = 1;
driver->states[0].target_residency = 10000;
driver->states[0].flags = CPUIDLE_FLAG_TIME_VALID;
strcpy(driver->states[0].name, "WFI");
strcpy(driver->states[0].desc, "Wait for interrupt");
/* Wait for interrupt and RAM self refresh state */
device->states[1].enter = at91_enter_idle;
device->states[1].exit_latency = 10;
device->states[1].target_residency = 10000;
device->states[1].flags = CPUIDLE_FLAG_TIME_VALID;
strcpy(device->states[1].name, "RAM_SR");
strcpy(device->states[1].desc, "WFI and RAM Self Refresh");
driver->states[1].enter = at91_enter_idle;
driver->states[1].exit_latency = 10;
driver->states[1].target_residency = 10000;
driver->states[1].flags = CPUIDLE_FLAG_TIME_VALID;
strcpy(driver->states[1].name, "RAM_SR");
strcpy(driver->states[1].desc, "WFI and RAM Self Refresh");
cpuidle_register_driver(&at91_idle_driver);
if (cpuidle_register_device(device)) {
printk(KERN_ERR "at91_init_cpuidle: Failed registering\n");

39
arch/arm/mach-davinci/cpuidle.c
View file

@ -78,6 +78,7 @@ static struct davinci_ops davinci_states[DAVINCI_CPUIDLE_MAX_STATES] = {
/* Actual code that puts the SoC in different idle states */
static int davinci_enter_idle(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
struct cpuidle_state_usage *state_usage = &dev->states_usage[index];
@ -109,6 +110,7 @@ static int __init davinci_cpuidle_probe(struct platform_device *pdev)
{
int ret;
struct cpuidle_device *device;
struct cpuidle_driver *driver = &davinci_idle_driver;
struct davinci_cpuidle_config *pdata = pdev->dev.platform_data;
device = &per_cpu(davinci_cpuidle_device, smp_processor_id());
@ -120,32 +122,33 @@ static int __init davinci_cpuidle_probe(struct platform_device *pdev)
ddr2_reg_base = pdata->ddr2_ctlr_base;
ret = cpuidle_register_driver(&davinci_idle_driver);
if (ret) {
dev_err(&pdev->dev, "failed to register driver\n");
return ret;
}
/* Wait for interrupt state */
device->states[0].enter = davinci_enter_idle;
device->states[0].exit_latency = 1;
device->states[0].target_residency = 10000;
device->states[0].flags = CPUIDLE_FLAG_TIME_VALID;
strcpy(device->states[0].name, "WFI");
strcpy(device->states[0].desc, "Wait for interrupt");
driver->states[0].enter = davinci_enter_idle;
driver->states[0].exit_latency = 1;
driver->states[0].target_residency = 10000;
driver->states[0].flags = CPUIDLE_FLAG_TIME_VALID;
strcpy(driver->states[0].name, "WFI");
strcpy(driver->states[0].desc, "Wait for interrupt");
/* Wait for interrupt and DDR self refresh state */
device->states[1].enter = davinci_enter_idle;
device->states[1].exit_latency = 10;
device->states[1].target_residency = 10000;
device->states[1].flags = CPUIDLE_FLAG_TIME_VALID;
strcpy(device->states[1].name, "DDR SR");
strcpy(device->states[1].desc, "WFI and DDR Self Refresh");
driver->states[1].enter = davinci_enter_idle;
driver->states[1].exit_latency = 10;
driver->states[1].target_residency = 10000;
driver->states[1].flags = CPUIDLE_FLAG_TIME_VALID;
strcpy(driver->states[1].name, "DDR SR");
strcpy(driver->states[1].desc, "WFI and DDR Self Refresh");
if (pdata->ddr2_pdown)
davinci_states[1].flags |= DAVINCI_CPUIDLE_FLAGS_DDR2_PWDN;
cpuidle_set_statedata(&device->states_usage[1], &davinci_states[1]);
device->state_count = DAVINCI_CPUIDLE_MAX_STATES;
driver->state_count = DAVINCI_CPUIDLE_MAX_STATES;
ret = cpuidle_register_driver(&davinci_idle_driver);
if (ret) {
dev_err(&pdev->dev, "failed to register driver\n");
return ret;
}
ret = cpuidle_register_device(device);
if (ret) {

21
arch/arm/mach-exynos4/cpuidle.c
View file

@ -16,6 +16,7 @@
#include <asm/proc-fns.h>
static int exynos4_enter_idle(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index);
static struct cpuidle_state exynos4_cpuidle_set[] = {
@ -37,6 +38,7 @@ static struct cpuidle_driver exynos4_idle_driver = {
};
static int exynos4_enter_idle(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
struct timeval before, after;
@ -60,22 +62,23 @@ static int __init exynos4_init_cpuidle(void)
{
int i, max_cpuidle_state, cpu_id;
struct cpuidle_device *device;
struct cpuidle_driver *drv = &exynos4_idle_driver;
/* Setup cpuidle driver */
drv->state_count = (sizeof(exynos4_cpuidle_set) /
sizeof(struct cpuidle_state));
max_cpuidle_state = drv->state_count;
for (i = 0; i < max_cpuidle_state; i++) {
memcpy(&drv->states[i], &exynos4_cpuidle_set[i],
sizeof(struct cpuidle_state));
}
cpuidle_register_driver(&exynos4_idle_driver);
for_each_cpu(cpu_id, cpu_online_mask) {
device = &per_cpu(exynos4_cpuidle_device, cpu_id);
device->cpu = cpu_id;
device->state_count = (sizeof(exynos4_cpuidle_set) /
sizeof(struct cpuidle_state));
max_cpuidle_state = device->state_count;
for (i = 0; i < max_cpuidle_state; i++) {
memcpy(&device->states[i], &exynos4_cpuidle_set[i],
sizeof(struct cpuidle_state));
}
device->state_count = drv->state_count;
if (cpuidle_register_device(device)) {
printk(KERN_ERR "CPUidle register device failed\n,");

30
arch/arm/mach-kirkwood/cpuidle.c
View file

@ -32,6 +32,7 @@ static DEFINE_PER_CPU(struct cpuidle_device, kirkwood_cpuidle_device);
/* Actual code that puts the SoC in different idle states */
static int kirkwood_enter_idle(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
struct timeval before, after;
@ -68,28 +69,29 @@ static int kirkwood_enter_idle(struct cpuidle_device *dev,
static int kirkwood_init_cpuidle(void)
{
struct cpuidle_device *device;
cpuidle_register_driver(&kirkwood_idle_driver);
struct cpuidle_driver *driver = &kirkwood_idle_driver;
device = &per_cpu(kirkwood_cpuidle_device, smp_processor_id());
device->state_count = KIRKWOOD_MAX_STATES;
driver->state_count = KIRKWOOD_MAX_STATES;
/* Wait for interrupt state */
device->states[0].enter = kirkwood_enter_idle;
device->states[0].exit_latency = 1;
device->states[0].target_residency = 10000;
device->states[0].flags = CPUIDLE_FLAG_TIME_VALID;
strcpy(device->states[0].name, "WFI");
strcpy(device->states[0].desc, "Wait for interrupt");
driver->states[0].enter = kirkwood_enter_idle;
driver->states[0].exit_latency = 1;
driver->states[0].target_residency = 10000;
driver->states[0].flags = CPUIDLE_FLAG_TIME_VALID;
strcpy(driver->states[0].name, "WFI");
strcpy(driver->states[0].desc, "Wait for interrupt");
/* Wait for interrupt and DDR self refresh state */
device->states[1].enter = kirkwood_enter_idle;
device->states[1].exit_latency = 10;
device->states[1].target_residency = 10000;
device->states[1].flags = CPUIDLE_FLAG_TIME_VALID;
strcpy(device->states[1].name, "DDR SR");
strcpy(device->states[1].desc, "WFI and DDR Self Refresh");
driver->states[1].enter = kirkwood_enter_idle;
driver->states[1].exit_latency = 10;
driver->states[1].target_residency = 10000;
driver->states[1].flags = CPUIDLE_FLAG_TIME_VALID;
strcpy(driver->states[1].name, "DDR SR");
strcpy(driver->states[1].desc, "WFI and DDR Self Refresh");
cpuidle_register_driver(&kirkwood_idle_driver);
if (cpuidle_register_device(device)) {
printk(KERN_ERR "kirkwood_init_cpuidle: Failed registering\n");
return -EIO;

73
arch/arm/mach-omap2/cpuidle34xx.c
View file

@ -88,12 +88,14 @@ static int _cpuidle_deny_idle(struct powerdomain *pwrdm,
/**
* omap3_enter_idle - Programs OMAP3 to enter the specified state
* @dev: cpuidle device
* @drv: cpuidle driver
* @index: the index of state to be entered
*
* Called from the CPUidle framework to program the device to the
* specified target state selected by the governor.
*/
static int omap3_enter_idle(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
struct omap3_idle_statedata *cx =
@ -148,6 +150,7 @@ return_sleep_time:
/**
* next_valid_state - Find next valid C-state
* @dev: cpuidle device
* @drv: cpuidle driver
* @index: Index of currently selected c-state
*
* If the state corresponding to index is valid, index is returned back
@ -158,10 +161,11 @@ return_sleep_time:
* if it satisfies the enable_off_mode condition.
*/
static int next_valid_state(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
struct cpuidle_state_usage *curr_usage = &dev->states_usage[index];
struct cpuidle_state *curr = &dev->states[index];
struct cpuidle_state *curr = &drv->states[index];
struct omap3_idle_statedata *cx = cpuidle_get_statedata(curr_usage);
u32 mpu_deepest_state = PWRDM_POWER_RET;
u32 core_deepest_state = PWRDM_POWER_RET;
@ -188,7 +192,7 @@ static int next_valid_state(struct cpuidle_device *dev,
/* Reach the current state starting at highest C-state */
for (; idx >= 0; idx--) {
if (&dev->states[idx] == curr) {
if (&drv->states[idx] == curr) {
next_index = idx;
break;
}
@ -224,12 +228,14 @@ static int next_valid_state(struct cpuidle_device *dev,
/**
* omap3_enter_idle_bm - Checks for any bus activity
* @dev: cpuidle device
* @drv: cpuidle driver
* @index: array index of target state to be programmed
*
* This function checks for any pending activity and then programs
* the device to the specified or a safer state.
*/
static int omap3_enter_idle_bm(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
int new_state_idx;
@ -238,7 +244,7 @@ static int omap3_enter_idle_bm(struct cpuidle_device *dev,
int ret;
if (!omap3_can_sleep()) {
new_state_idx = dev->safe_state_index;
new_state_idx = drv->safe_state_index;
goto select_state;
}
@ -248,7 +254,7 @@ static int omap3_enter_idle_bm(struct cpuidle_device *dev,
*/
cam_state = pwrdm_read_pwrst(cam_pd);
if (cam_state == PWRDM_POWER_ON) {
new_state_idx = dev->safe_state_index;
new_state_idx = drv->safe_state_index;
goto select_state;
}
@ -275,10 +281,10 @@ static int omap3_enter_idle_bm(struct cpuidle_device *dev,
if (per_next_state != per_saved_state)
pwrdm_set_next_pwrst(per_pd, per_next_state);
new_state_idx = next_valid_state(dev, index);
new_state_idx = next_valid_state(dev, drv, index);
select_state:
ret = omap3_enter_idle(dev, new_state_idx);
ret = omap3_enter_idle(dev, drv, new_state_idx);
/* Restore original PER state if it was modified */
if (per_next_state != per_saved_state)
@ -311,22 +317,30 @@ struct cpuidle_driver omap3_idle_driver = {
.owner = THIS_MODULE,
};
/* Helper to fill the C-state common data and register the driver_data */
static inline struct omap3_idle_statedata *_fill_cstate(
struct cpuidle_device *dev,
/* Helper to fill the C-state common data*/
static inline void _fill_cstate(struct cpuidle_driver *drv,
int idx, const char *descr)
{
struct omap3_idle_statedata *cx = &omap3_idle_data[idx];
struct cpuidle_state *state = &dev->states[idx];
struct cpuidle_state_usage *state_usage = &dev->states_usage[idx];
struct cpuidle_state *state = &drv->states[idx];
state->exit_latency = cpuidle_params_table[idx].exit_latency;
state->target_residency = cpuidle_params_table[idx].target_residency;
state->flags = CPUIDLE_FLAG_TIME_VALID;
state->enter = omap3_enter_idle_bm;
cx->valid = cpuidle_params_table[idx].valid;
sprintf(state->name, "C%d", idx + 1);
strncpy(state->desc, descr, CPUIDLE_DESC_LEN);
}
/* Helper to register the driver_data */
static inline struct omap3_idle_statedata *_fill_cstate_usage(
struct cpuidle_device *dev,
int idx)
{
struct omap3_idle_statedata *cx = &omap3_idle_data[idx];
struct cpuidle_state_usage *state_usage = &dev->states_usage[idx];
cx->valid = cpuidle_params_table[idx].valid;
cpuidle_set_statedata(state_usage, cx);
return cx;
@ -341,6 +355,7 @@ static inline struct omap3_idle_statedata *_fill_cstate(
int __init omap3_idle_init(void)
{
struct cpuidle_device *dev;
struct cpuidle_driver *drv = &omap3_idle_driver;
struct omap3_idle_statedata *cx;
mpu_pd = pwrdm_lookup("mpu_pwrdm");
@ -348,45 +363,52 @@ int __init omap3_idle_init(void)
per_pd = pwrdm_lookup("per_pwrdm");
cam_pd = pwrdm_lookup("cam_pwrdm");
cpuidle_register_driver(&omap3_idle_driver);
drv->safe_state_index = -1;
dev = &per_cpu(omap3_idle_dev, smp_processor_id());
dev->safe_state_index = -1;
/* C1 . MPU WFI + Core active */
cx = _fill_cstate(dev, 0, "MPU ON + CORE ON");
(&dev->states[0])->enter = omap3_enter_idle;
dev->safe_state_index = 0;
_fill_cstate(drv, 0, "MPU ON + CORE ON");
(&drv->states[0])->enter = omap3_enter_idle;
drv->safe_state_index = 0;
cx = _fill_cstate_usage(dev, 0);
cx->valid = 1; /* C1 is always valid */
cx->mpu_state = PWRDM_POWER_ON;
cx->core_state = PWRDM_POWER_ON;
/* C2 . MPU WFI + Core inactive */
cx = _fill_cstate(dev, 1, "MPU ON + CORE ON");
_fill_cstate(drv, 1, "MPU ON + CORE ON");
cx = _fill_cstate_usage(dev, 1);
cx->mpu_state = PWRDM_POWER_ON;
cx->core_state = PWRDM_POWER_ON;
/* C3 . MPU CSWR + Core inactive */
cx = _fill_cstate(dev, 2, "MPU RET + CORE ON");
_fill_cstate(drv, 2, "MPU RET + CORE ON");
cx = _fill_cstate_usage(dev, 2);
cx->mpu_state = PWRDM_POWER_RET;
cx->core_state = PWRDM_POWER_ON;
/* C4 . MPU OFF + Core inactive */
cx = _fill_cstate(dev, 3, "MPU OFF + CORE ON");
_fill_cstate(drv, 3, "MPU OFF + CORE ON");
cx = _fill_cstate_usage(dev, 3);
cx->mpu_state = PWRDM_POWER_OFF;
cx->core_state = PWRDM_POWER_ON;
/* C5 . MPU RET + Core RET */
cx = _fill_cstate(dev, 4, "MPU RET + CORE RET");
_fill_cstate(drv, 4, "MPU RET + CORE RET");
cx = _fill_cstate_usage(dev, 4);
cx->mpu_state = PWRDM_POWER_RET;
cx->core_state = PWRDM_POWER_RET;
/* C6 . MPU OFF + Core RET */
cx = _fill_cstate(dev, 5, "MPU OFF + CORE RET");
_fill_cstate(drv, 5, "MPU OFF + CORE RET");
cx = _fill_cstate_usage(dev, 5);
cx->mpu_state = PWRDM_POWER_OFF;
cx->core_state = PWRDM_POWER_RET;
/* C7 . MPU OFF + Core OFF */
cx = _fill_cstate(dev, 6, "MPU OFF + CORE OFF");
_fill_cstate(drv, 6, "MPU OFF + CORE OFF");
cx = _fill_cstate_usage(dev, 6);
/*
* Erratum i583: implementation for ES rev < Es1.2 on 3630. We cannot
* enable OFF mode in a stable form for previous revisions.
@ -400,6 +422,9 @@ int __init omap3_idle_init(void)
cx->mpu_state = PWRDM_POWER_OFF;
cx->core_state = PWRDM_POWER_OFF;
drv->state_count = OMAP3_NUM_STATES;
cpuidle_register_driver(&omap3_idle_driver);
dev->state_count = OMAP3_NUM_STATES;
if (cpuidle_register_device(dev)) {
printk(KERN_ERR "%s: CPUidle register device failed\n",

18
arch/sh/kernel/cpu/shmobile/cpuidle.c
View file

@ -25,6 +25,7 @@ static unsigned long cpuidle_mode[] = {
};
static int cpuidle_sleep_enter(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
unsigned long allowed_mode = arch_hwblk_sleep_mode();
@ -64,19 +65,19 @@ static struct cpuidle_driver cpuidle_driver = {
void sh_mobile_setup_cpuidle(void)
{
struct cpuidle_device *dev = &cpuidle_dev;
struct cpuidle_driver *drv = &cpuidle_driver;
struct cpuidle_state *state;
int i;
cpuidle_register_driver(&cpuidle_driver);
for (i = 0; i < CPUIDLE_STATE_MAX; i++) {
dev->states[i].name[0] = '\0';
dev->states[i].desc[0] = '\0';
drv->states[i].name[0] = '\0';
drv->states[i].desc[0] = '\0';
}
i = CPUIDLE_DRIVER_STATE_START;
state = &dev->states[i++];
state = &drv->states[i++];
snprintf(state->name, CPUIDLE_NAME_LEN, "C1");
strncpy(state->desc, "SuperH Sleep Mode", CPUIDLE_DESC_LEN);
state->exit_latency = 1;
@ -86,10 +87,10 @@ void sh_mobile_setup_cpuidle(void)
state->flags |= CPUIDLE_FLAG_TIME_VALID;
state->enter = cpuidle_sleep_enter;
dev->safe_state_index = i-1;
drv->safe_state_index = i-1;
if (sh_mobile_sleep_supported & SUSP_SH_SF) {
state = &dev->states[i++];
state = &drv->states[i++];
snprintf(state->name, CPUIDLE_NAME_LEN, "C2");
strncpy(state->desc, "SuperH Sleep Mode [SF]",
CPUIDLE_DESC_LEN);
@ -102,7 +103,7 @@ void sh_mobile_setup_cpuidle(void)
}
if (sh_mobile_sleep_supported & SUSP_SH_STANDBY) {
state = &dev->states[i++];
state = &drv->states[i++];
snprintf(state->name, CPUIDLE_NAME_LEN, "C3");
strncpy(state->desc, "SuperH Mobile Standby Mode [SF]",
CPUIDLE_DESC_LEN);
@ -114,7 +115,10 @@ void sh_mobile_setup_cpuidle(void)
state->enter = cpuidle_sleep_enter;
}
drv->state_count = i;
dev->state_count = i;
cpuidle_register_driver(&cpuidle_driver);
cpuidle_register_device(dev);
}

20
drivers/acpi/processor_driver.c
View file

@ -426,7 +426,7 @@ static int acpi_cpu_soft_notify(struct notifier_block *nfb,
if (action == CPU_ONLINE && pr) {
acpi_processor_ppc_has_changed(pr, 0);
acpi_processor_cst_has_changed(pr);
acpi_processor_hotplug(pr);
acpi_processor_reevaluate_tstate(pr, action);
acpi_processor_tstate_has_changed(pr);
}
@ -503,8 +503,7 @@ static int __cpuinit acpi_processor_add(struct acpi_device *device)
acpi_processor_get_throttling_info(pr);
acpi_processor_get_limit_info(pr);
if (cpuidle_get_driver() == &acpi_idle_driver)
if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
acpi_processor_power_init(pr, device);
pr->cdev = thermal_cooling_device_register("Processor", device,
@ -800,17 +799,9 @@ static int __init acpi_processor_init(void)
memset(&errata, 0, sizeof(errata));
if (!cpuidle_register_driver(&acpi_idle_driver)) {
printk(KERN_DEBUG "ACPI: %s registered with cpuidle\n",
acpi_idle_driver.name);
} else {
printk(KERN_DEBUG "ACPI: acpi_idle yielding to %s\n",
cpuidle_get_driver()->name);
}
result = acpi_bus_register_driver(&acpi_processor_driver);
if (result < 0)
goto out_cpuidle;
return result;
acpi_processor_install_hotplug_notify();
@ -821,11 +812,6 @@ static int __init acpi_processor_init(void)
acpi_processor_throttling_init();
return 0;
out_cpuidle:
cpuidle_unregister_driver(&acpi_idle_driver);
return result;
}
static void __exit acpi_processor_exit(void)

191
drivers/acpi/processor_idle.c
View file

@ -741,11 +741,13 @@ static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx)
/**
* acpi_idle_enter_c1 - enters an ACPI C1 state-type
* @dev: the target CPU
* @drv: cpuidle driver containing cpuidle state info
* @index: index of target state
*
* This is equivalent to the HALT instruction.
*/
static int acpi_idle_enter_c1(struct cpuidle_device *dev, int index)
static int acpi_idle_enter_c1(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
ktime_t kt1, kt2;
s64 idle_time;
@ -787,9 +789,11 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev, int index)
/**
* acpi_idle_enter_simple - enters an ACPI state without BM handling
* @dev: the target CPU
* @drv: cpuidle driver with cpuidle state information
* @index: the index of suggested state
*/
static int acpi_idle_enter_simple(struct cpuidle_device *dev, int index)
static int acpi_idle_enter_simple(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
struct acpi_processor *pr;
struct cpuidle_state_usage *state_usage = &dev->states_usage[index];
@ -869,11 +873,13 @@ static DEFINE_SPINLOCK(c3_lock);
/**
* acpi_idle_enter_bm - enters C3 with proper BM handling
* @dev: the target CPU
* @drv: cpuidle driver containing state data
* @index: the index of suggested state
*
* If BM is detected, the deepest non-C3 idle state is entered instead.
*/
static int acpi_idle_enter_bm(struct cpuidle_device *dev, int index)
static int acpi_idle_enter_bm(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
struct acpi_processor *pr;
struct cpuidle_state_usage *state_usage = &dev->states_usage[index];
@ -896,9 +902,9 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev, int index)
}
if (!cx->bm_sts_skip && acpi_idle_bm_check()) {
if (dev->safe_state_index >= 0) {
return dev->states[dev->safe_state_index].enter(dev,
dev->safe_state_index);
if (drv->safe_state_index >= 0) {
return drv->states[drv->safe_state_index].enter(dev,
drv, drv->safe_state_index);
} else {
local_irq_disable();
acpi_safe_halt();
@ -993,14 +999,15 @@ struct cpuidle_driver acpi_idle_driver = {
};
/**
* acpi_processor_setup_cpuidle - prepares and configures CPUIDLE
* acpi_processor_setup_cpuidle_cx - prepares and configures CPUIDLE
* device i.e. per-cpu data
*
* @pr: the ACPI processor
*/
static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr)
{
int i, count = CPUIDLE_DRIVER_STATE_START;
struct acpi_processor_cx *cx;
struct cpuidle_state *state;
struct cpuidle_state_usage *state_usage;
struct cpuidle_device *dev = &pr->power.dev;
@ -1012,18 +1019,12 @@ static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
}
dev->cpu = pr->id;
dev->safe_state_index = -1;
for (i = 0; i < CPUIDLE_STATE_MAX; i++) {
dev->states[i].name[0] = '\0';
dev->states[i].desc[0] = '\0';
}
if (max_cstate == 0)
max_cstate = 1;
for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
cx = &pr->power.states[i];
state = &dev->states[count];
state_usage = &dev->states_usage[count];
if (!cx->valid)
@ -1035,8 +1036,64 @@ static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
!(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
continue;
#endif
cpuidle_set_statedata(state_usage, cx);
count++;
if (count == CPUIDLE_STATE_MAX)
break;
}
dev->state_count = count;
if (!count)
return -EINVAL;
return 0;
}
/**
* acpi_processor_setup_cpuidle states- prepares and configures cpuidle
* global state data i.e. idle routines
*
* @pr: the ACPI processor
*/
static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)
{
int i, count = CPUIDLE_DRIVER_STATE_START;
struct acpi_processor_cx *cx;
struct cpuidle_state *state;
struct cpuidle_driver *drv = &acpi_idle_driver;
if (!pr->flags.power_setup_done)
return -EINVAL;
if (pr->flags.power == 0)
return -EINVAL;
drv->safe_state_index = -1;
for (i = 0; i < CPUIDLE_STATE_MAX; i++) {
drv->states[i].name[0] = '\0';
drv->states[i].desc[0] = '\0';
}
if (max_cstate == 0)
max_cstate = 1;
for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
cx = &pr->power.states[i];
if (!cx->valid)
continue;
#ifdef CONFIG_HOTPLUG_CPU
if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) &&
!pr->flags.has_cst &&
!(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
continue;
#endif
state = &drv->states[count];
snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i);
strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
state->exit_latency = cx->latency;
@ -1049,13 +1106,13 @@ static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
state->flags |= CPUIDLE_FLAG_TIME_VALID;
state->enter = acpi_idle_enter_c1;
dev->safe_state_index = count;
drv->safe_state_index = count;
break;
case ACPI_STATE_C2:
state->flags |= CPUIDLE_FLAG_TIME_VALID;
state->enter = acpi_idle_enter_simple;
dev->safe_state_index = count;
drv->safe_state_index = count;
break;
case ACPI_STATE_C3:
@ -1071,7 +1128,7 @@ static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
break;
}
dev->state_count = count;
drv->state_count = count;
if (!count)
return -EINVAL;
@ -1079,7 +1136,7 @@ static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
return 0;
}
int acpi_processor_cst_has_changed(struct acpi_processor *pr)
int acpi_processor_hotplug(struct acpi_processor *pr)
{
int ret = 0;
@ -1100,7 +1157,7 @@ int acpi_processor_cst_has_changed(struct acpi_processor *pr)
cpuidle_disable_device(&pr->power.dev);
acpi_processor_get_power_info(pr);
if (pr->flags.power) {
acpi_processor_setup_cpuidle(pr);
acpi_processor_setup_cpuidle_cx(pr);
ret = cpuidle_enable_device(&pr->power.dev);
}
cpuidle_resume_and_unlock();
@ -1108,10 +1165,72 @@ int acpi_processor_cst_has_changed(struct acpi_processor *pr)
return ret;
}
int acpi_processor_cst_has_changed(struct acpi_processor *pr)
{
int cpu;
struct acpi_processor *_pr;
if (disabled_by_idle_boot_param())
return 0;
if (!pr)
return -EINVAL;
if (nocst)
return -ENODEV;
if (!pr->flags.power_setup_done)
return -ENODEV;
/*
* FIXME: Design the ACPI notification to make it once per
* system instead of once per-cpu. This condition is a hack
* to make the code that updates C-States be called once.
*/
if (smp_processor_id() == 0 &&
cpuidle_get_driver() == &acpi_idle_driver) {
cpuidle_pause_and_lock();
/* Protect against cpu-hotplug */
get_online_cpus();
/* Disable all cpuidle devices */
for_each_online_cpu(cpu) {
_pr = per_cpu(processors, cpu);
if (!_pr || !_pr->flags.power_setup_done)
continue;
cpuidle_disable_device(&_pr->power.dev);
}
/* Populate Updated C-state information */
acpi_processor_setup_cpuidle_states(pr);
/* Enable all cpuidle devices */
for_each_online_cpu(cpu) {
_pr = per_cpu(processors, cpu);
if (!_pr || !_pr->flags.power_setup_done)
continue;
acpi_processor_get_power_info(_pr);
if (_pr->flags.power) {
acpi_processor_setup_cpuidle_cx(_pr);
cpuidle_enable_device(&_pr->power.dev);
}
}
put_online_cpus();
cpuidle_resume_and_unlock();
}
return 0;
}
static int acpi_processor_registered;
int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
struct acpi_device *device)
{
acpi_status status = 0;
int retval;
static int first_run;
if (disabled_by_idle_boot_param())
@ -1148,9 +1267,26 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
* platforms that only support C1.
*/
if (pr->flags.power) {
acpi_processor_setup_cpuidle(pr);
if (cpuidle_register_device(&pr->power.dev))
return -EIO;
/* Register acpi_idle_driver if not already registered */
if (!acpi_processor_registered) {
acpi_processor_setup_cpuidle_states(pr);
retval = cpuidle_register_driver(&acpi_idle_driver);
if (retval)
return retval;
printk(KERN_DEBUG "ACPI: %s registered with cpuidle\n",
acpi_idle_driver.name);
}
/* Register per-cpu cpuidle_device. Cpuidle driver
* must already be registered before registering device
*/
acpi_processor_setup_cpuidle_cx(pr);
retval = cpuidle_register_device(&pr->power.dev);
if (retval) {
if (acpi_processor_registered == 0)
cpuidle_unregister_driver(&acpi_idle_driver);
return retval;
}
acpi_processor_registered++;
}
return 0;
}
@ -1161,8 +1297,13 @@ int acpi_processor_power_exit(struct acpi_processor *pr,
if (disabled_by_idle_boot_param())
return 0;
cpuidle_unregister_device(&pr->power.dev);
pr->flags.power_setup_done = 0;
if (pr->flags.power) {
cpuidle_unregister_device(&pr->power.dev);
acpi_processor_registered--;
if (acpi_processor_registered == 0)
cpuidle_unregister_driver(&acpi_idle_driver);
}
pr->flags.power_setup_done = 0;
return 0;
}

45
drivers/cpuidle/cpuidle.c
View file

@ -61,6 +61,7 @@ static int __cpuidle_register_device(struct cpuidle_device *dev);
int cpuidle_idle_call(void)
{
struct cpuidle_device *dev = __this_cpu_read(cpuidle_devices);
struct cpuidle_driver *drv = cpuidle_get_driver();
struct cpuidle_state *target_state;
int next_state, entered_state;
@ -84,18 +85,18 @@ int cpuidle_idle_call(void)
#endif
/* ask the governor for the next state */
next_state = cpuidle_curr_governor->select(dev);
next_state = cpuidle_curr_governor->select(drv, dev);
if (need_resched()) {
local_irq_enable();
return 0;
}
target_state = &dev->states[next_state];
target_state = &drv->states[next_state];
trace_power_start(POWER_CSTATE, next_state, dev->cpu);
trace_cpu_idle(next_state, dev->cpu);
entered_state = target_state->enter(dev, next_state);
entered_state = target_state->enter(dev, drv, next_state);
trace_power_end(dev->cpu);
trace_cpu_idle(PWR_EVENT_EXIT, dev->cpu);
@ -163,7 +164,8 @@ 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, int index)
static int poll_idle(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
ktime_t t1, t2;
s64 diff;
@ -183,12 +185,9 @@ static int poll_idle(struct cpuidle_device *dev, int index)
return index;
}
static void poll_idle_init(struct cpuidle_device *dev)
static void poll_idle_init(struct cpuidle_driver *drv)
{
struct cpuidle_state *state = &dev->states[0];
struct cpuidle_state_usage *state_usage = &dev->states_usage[0];
cpuidle_set_statedata(state_usage, NULL);
struct cpuidle_state *state = &drv->states[0];
snprintf(state->name, CPUIDLE_NAME_LEN, "POLL");
snprintf(state->desc, CPUIDLE_DESC_LEN, "CPUIDLE CORE POLL IDLE");
@ -199,7 +198,7 @@ static void poll_idle_init(struct cpuidle_device *dev)
state->enter = poll_idle;
}
#else
static void poll_idle_init(struct cpuidle_device *dev) {}
static void poll_idle_init(struct cpuidle_driver *drv) {}
#endif /* CONFIG_ARCH_HAS_CPU_RELAX */
/**
@ -226,13 +225,13 @@ int cpuidle_enable_device(struct cpuidle_device *dev)
return ret;
}
poll_idle_init(dev);
poll_idle_init(cpuidle_get_driver());
if ((ret = cpuidle_add_state_sysfs(dev)))
return ret;
if (cpuidle_curr_governor->enable &&
(ret = cpuidle_curr_governor->enable(dev)))
(ret = cpuidle_curr_governor->enable(cpuidle_get_driver(), dev)))
goto fail_sysfs;
for (i = 0; i < dev->state_count; i++) {
@ -273,7 +272,7 @@ void cpuidle_disable_device(struct cpuidle_device *dev)
dev->enabled = 0;
if (cpuidle_curr_governor->disable)
cpuidle_curr_governor->disable(dev);
cpuidle_curr_governor->disable(cpuidle_get_driver(), dev);
cpuidle_remove_state_sysfs(dev);
enabled_devices--;
@ -301,26 +300,6 @@ static int __cpuidle_register_device(struct cpuidle_device *dev)
init_completion(&dev->kobj_unregister);
/*
* cpuidle driver should set the dev->power_specified bit
* before registering the device if the driver provides
* power_usage numbers.
*
* For those devices whose ->power_specified is not set,
* we fill in power_usage with decreasing values as the
* cpuidle code has an implicit assumption that state Cn
* uses less power than C(n-1).
*
* With CONFIG_ARCH_HAS_CPU_RELAX, C0 is already assigned
* an power value of -1. So we use -2, -3, etc, for other
* c-states.
*/
if (!dev->power_specified) {
int i;
for (i = CPUIDLE_DRIVER_STATE_START; i < dev->state_count; i++)
dev->states[i].power_usage = -1 - i;
}
per_cpu(cpuidle_devices, dev->cpu) = dev;
list_add(&dev->device_list, &cpuidle_detected_devices);
if ((ret = cpuidle_add_sysfs(sys_dev))) {

25
drivers/cpuidle/driver.c
View file

@ -17,6 +17,30 @@
static struct cpuidle_driver *cpuidle_curr_driver;
DEFINE_SPINLOCK(cpuidle_driver_lock);
static void __cpuidle_register_driver(struct cpuidle_driver *drv)
{
int i;
/*
* cpuidle driver should set the drv->power_specified bit
* before registering if the driver provides
* power_usage numbers.
*
* If power_specified is not set,
* we fill in power_usage with decreasing values as the
* cpuidle code has an implicit assumption that state Cn
* uses less power than C(n-1).
*
* With CONFIG_ARCH_HAS_CPU_RELAX, C0 is already assigned
* an power value of -1. So we use -2, -3, etc, for other
* c-states.
*/
if (!drv->power_specified) {
for (i = CPUIDLE_DRIVER_STATE_START; i < drv->state_count; i++)
drv->states[i].power_usage = -1 - i;
}
}
/**
* cpuidle_register_driver - registers a driver
* @drv: the driver
@ -34,6 +58,7 @@ int cpuidle_register_driver(struct cpuidle_driver *drv)
spin_unlock(&cpuidle_driver_lock);
return -EBUSY;
}
__cpuidle_register_driver(drv);
cpuidle_curr_driver = drv;
spin_unlock(&cpuidle_driver_lock);

28
drivers/cpuidle/governors/ladder.c
View file

@ -60,9 +60,11 @@ static inline void ladder_do_selection(struct ladder_device *ldev,
/**
* ladder_select_state - selects the next state to enter
* @drv: cpuidle driver
* @dev: the CPU
*/
static int ladder_select_state(struct cpuidle_device *dev)
static int ladder_select_state(struct cpuidle_driver *drv,
struct cpuidle_device *dev)
{
struct ladder_device *ldev = &__get_cpu_var(ladder_devices);
struct ladder_device_state *last_state;
@ -77,15 +79,17 @@ static int ladder_select_state(struct cpuidle_device *dev)
last_state = &ldev->states[last_idx];
if (dev->states[last_idx].flags & CPUIDLE_FLAG_TIME_VALID)
last_residency = cpuidle_get_last_residency(dev) - dev->states[last_idx].exit_latency;
if (drv->states[last_idx].flags & CPUIDLE_FLAG_TIME_VALID) {
last_residency = cpuidle_get_last_residency(dev) - \
drv->states[last_idx].exit_latency;
}
else
last_residency = last_state->threshold.promotion_time + 1;
/* consider promotion */
if (last_idx < dev->state_count - 1 &&
if (last_idx < drv->state_count - 1 &&
last_residency > last_state->threshold.promotion_time &&
dev->states[last_idx + 1].exit_latency <= latency_req) {
drv->states[last_idx + 1].exit_latency <= latency_req) {
last_state->stats.promotion_count++;
last_state->stats.demotion_count = 0;
if (last_state->stats.promotion_count >= last_state->threshold.promotion_count) {
@ -96,11 +100,11 @@ static int ladder_select_state(struct cpuidle_device *dev)
/* consider demotion */
if (last_idx > CPUIDLE_DRIVER_STATE_START &&
dev->states[last_idx].exit_latency > latency_req) {
drv->states[last_idx].exit_latency > latency_req) {
int i;
for (i = last_idx - 1; i > CPUIDLE_DRIVER_STATE_START; i--) {
if (dev->states[i].exit_latency <= latency_req)
if (drv->states[i].exit_latency <= latency_req)
break;
}
ladder_do_selection(ldev, last_idx, i);
@ -123,9 +127,11 @@ static int ladder_select_state(struct cpuidle_device *dev)
/**
* ladder_enable_device - setup for the governor
* @drv: cpuidle driver
* @dev: the CPU
*/
static int ladder_enable_device(struct cpuidle_device *dev)
static int ladder_enable_device(struct cpuidle_driver *drv,
struct cpuidle_device *dev)
{
int i;
struct ladder_device *ldev = &per_cpu(ladder_devices, dev->cpu);
@ -134,8 +140,8 @@ static int ladder_enable_device(struct cpuidle_device *dev)
ldev->last_state_idx = CPUIDLE_DRIVER_STATE_START;
for (i = 0; i < dev->state_count; i++) {
state = &dev->states[i];
for (i = 0; i < drv->state_count; i++) {
state = &drv->states[i];
lstate = &ldev->states[i];
lstate->stats.promotion_count = 0;
@ -144,7 +150,7 @@ static int ladder_enable_device(struct cpuidle_device *dev)
lstate->threshold.promotion_count = PROMOTION_COUNT;
lstate->threshold.demotion_count = DEMOTION_COUNT;
if (i < dev->state_count - 1)
if (i < drv->state_count - 1)
lstate->threshold.promotion_time = state->exit_latency;
if (i > 0)
lstate->threshold.demotion_time = state->exit_latency;

20
drivers/cpuidle/governors/menu.c
View file

@ -182,7 +182,7 @@ static inline int performance_multiplier(void)
static DEFINE_PER_CPU(struct menu_device, menu_devices);
static void menu_update(struct cpuidle_device *dev);
static void menu_update(struct cpuidle_driver *drv, struct cpuidle_device *dev);
/* This implements DIV_ROUND_CLOSEST but avoids 64 bit division */
static u64 div_round64(u64 dividend, u32 divisor)
@ -228,9 +228,10 @@ static void detect_repeating_patterns(struct menu_device *data)
/**
* menu_select - selects the next idle state to enter
* @drv: cpuidle driver containing state data
* @dev: the CPU
*/
static int menu_select(struct cpuidle_device *dev)
static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
{
struct menu_device *data = &__get_cpu_var(menu_devices);
int latency_req = pm_qos_request(PM_QOS_CPU_DMA_LATENCY);
@ -240,7 +241,7 @@ static int menu_select(struct cpuidle_device *dev)
struct timespec t;
if (data->needs_update) {
menu_update(dev);
menu_update(drv, dev);
data->needs_update = 0;
}
@ -285,8 +286,8 @@ static int menu_select(struct cpuidle_device *dev)
* Find the idle state with the lowest power while satisfying
* our constraints.
*/
for (i = CPUIDLE_DRIVER_STATE_START; i < dev->state_count; i++) {
struct cpuidle_state *s = &dev->states[i];
for (i = CPUIDLE_DRIVER_STATE_START; i < drv->state_count; i++) {
struct cpuidle_state *s = &drv->states[i];
if (s->target_residency > data->predicted_us)
continue;
@ -323,14 +324,15 @@ static void menu_reflect(struct cpuidle_device *dev, int index)
/**
* menu_update - attempts to guess what happened after entry
* @drv: cpuidle driver containing state data
* @dev: the CPU
*/
static void menu_update(struct cpuidle_device *dev)
static void menu_update(struct cpuidle_driver *drv, struct cpuidle_device *dev)
{
struct menu_device *data = &__get_cpu_var(menu_devices);
int last_idx = data->last_state_idx;
unsigned int last_idle_us = cpuidle_get_last_residency(dev);
struct cpuidle_state *target = &dev->states[last_idx];
struct cpuidle_state *target = &drv->states[last_idx];
unsigned int measured_us;
u64 new_factor;
@ -384,9 +386,11 @@ static void menu_update(struct cpuidle_device *dev)
/**
* menu_enable_device - scans a CPU's states and does setup
* @drv: cpuidle driver
* @dev: the CPU
*/
static int menu_enable_device(struct cpuidle_device *dev)
static int menu_enable_device(struct cpuidle_driver *drv,
struct cpuidle_device *dev)
{
struct menu_device *data = &per_cpu(menu_devices, dev->cpu);

3
drivers/cpuidle/sysfs.c
View file

@ -322,13 +322,14 @@ int cpuidle_add_state_sysfs(struct cpuidle_device *device)
{
int i, ret = -ENOMEM;
struct cpuidle_state_kobj *kobj;
struct cpuidle_driver *drv = cpuidle_get_driver();
/* state statistics */
for (i = 0; i < device->state_count; i++) {
kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
if (!kobj)
goto error_state;
kobj->state = &device->states[i];
kobj->state = &drv->states[i];
kobj->state_usage = &device->states_usage[i];
init_completion(&kobj->kobj_unregister);

80
drivers/idle/intel_idle.c
View file

@ -81,7 +81,8 @@ static unsigned int mwait_substates;
static unsigned int lapic_timer_reliable_states = (1 << 1); /* Default to only C1 */
static struct cpuidle_device __percpu *intel_idle_cpuidle_devices;
static int intel_idle(struct cpuidle_device *dev, int index);
static int intel_idle(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index);
static struct cpuidle_state *cpuidle_state_table;
@ -227,13 +228,15 @@ static int get_driver_data(int cstate)
/**
* intel_idle
* @dev: cpuidle_device
* @drv: cpuidle driver
* @index: index of cpuidle state
*
*/
static int intel_idle(struct cpuidle_device *dev, int index)
static int intel_idle(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
unsigned long ecx = 1; /* break on interrupt flag */
struct cpuidle_state *state = &dev->states[index];
struct cpuidle_state *state = &drv->states[index];
struct cpuidle_state_usage *state_usage = &dev->states_usage[index];
unsigned long eax = (unsigned long)cpuidle_get_statedata(state_usage);
unsigned int cstate;
@ -419,6 +422,60 @@ static void intel_idle_cpuidle_devices_uninit(void)
free_percpu(intel_idle_cpuidle_devices);
return;
}
/*
* intel_idle_cpuidle_driver_init()
* allocate, initialize cpuidle_states
*/
static int intel_idle_cpuidle_driver_init(void)
{
int cstate;
struct cpuidle_driver *drv = &intel_idle_driver;
drv->state_count = 1;
for (cstate = 1; cstate < MWAIT_MAX_NUM_CSTATES; ++cstate) {
int num_substates;
if (cstate > max_cstate) {
printk(PREFIX "max_cstate %d reached\n",
max_cstate);
break;
}
/* does the state exist in CPUID.MWAIT? */
num_substates = (mwait_substates >> ((cstate) * 4))
& MWAIT_SUBSTATE_MASK;
if (num_substates == 0)
continue;
/* is the state not enabled? */
if (cpuidle_state_table[cstate].enter == NULL) {
/* does the driver not know about the state? */
if (*cpuidle_state_table[cstate].name == '\0')
pr_debug(PREFIX "unaware of model 0x%x"
" MWAIT %d please"
" contact lenb@kernel.org",
boot_cpu_data.x86_model, cstate);
continue;
}
if ((cstate > 2) &&
!boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
mark_tsc_unstable("TSC halts in idle"
" states deeper than C2");
drv->states[drv->state_count] = /* structure copy */
cpuidle_state_table[cstate];
drv->state_count += 1;
}
if (auto_demotion_disable_flags)
smp_call_function(auto_demotion_disable, NULL, 1);
return 0;
}
/*
* intel_idle_cpuidle_devices_init()
* allocate, initialize, register cpuidle_devices
@ -453,23 +510,9 @@ static int intel_idle_cpuidle_devices_init(void)
continue;
/* is the state not enabled? */
if (cpuidle_state_table[cstate].enter == NULL) {
/* does the driver not know about the state? */
if (*cpuidle_state_table[cstate].name == '\0')
pr_debug(PREFIX "unaware of model 0x%x"
" MWAIT %d please"
" contact lenb@kernel.org",
boot_cpu_data.x86_model, cstate);
continue;
}
if ((cstate > 2) &&
!boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
mark_tsc_unstable("TSC halts in idle"
" states deeper than C2");
dev->states[dev->state_count] = /* structure copy */
cpuidle_state_table[cstate];
dev->states_usage[dev->state_count].driver_data =
(void *)get_driver_data(cstate);
@ -484,8 +527,6 @@ static int intel_idle_cpuidle_devices_init(void)
return -EIO;
}
}
if (auto_demotion_disable_flags)
smp_call_function(auto_demotion_disable, NULL, 1);
return 0;
}
@ -503,6 +544,7 @@ static int __init intel_idle_init(void)
if (retval)
return retval;
intel_idle_cpuidle_driver_init();
retval = cpuidle_register_driver(&intel_idle_driver);
if (retval) {
printk(KERN_DEBUG PREFIX "intel_idle yielding to %s",

1
include/acpi/processor.h
View file

@ -329,6 +329,7 @@ extern void acpi_processor_throttling_init(void);
int acpi_processor_power_init(struct acpi_processor *pr,
struct acpi_device *device);
int acpi_processor_cst_has_changed(struct acpi_processor *pr);
int acpi_processor_hotplug(struct acpi_processor *pr);
int acpi_processor_power_exit(struct acpi_processor *pr,
struct acpi_device *device);
int acpi_processor_suspend(struct acpi_device * device, pm_message_t state);

19
include/linux/cpuidle.h
View file

@ -22,6 +22,7 @@
#define CPUIDLE_DESC_LEN 32
struct cpuidle_device;
struct cpuidle_driver;
/****************************
@ -45,6 +46,7 @@ struct cpuidle_state {
unsigned int target_residency; /* in US */
int (*enter) (struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index);
};
@ -83,12 +85,10 @@ struct cpuidle_state_kobj {
struct cpuidle_device {
unsigned int registered:1;
unsigned int enabled:1;
unsigned int power_specified:1;
unsigned int cpu;
int last_residency;
int state_count;
struct cpuidle_state states[CPUIDLE_STATE_MAX];
struct cpuidle_state_usage states_usage[CPUIDLE_STATE_MAX];
struct cpuidle_state_kobj *kobjs[CPUIDLE_STATE_MAX];
@ -96,7 +96,6 @@ struct cpuidle_device {
struct kobject kobj;
struct completion kobj_unregister;
void *governor_data;
int safe_state_index;
};
DECLARE_PER_CPU(struct cpuidle_device *, cpuidle_devices);
@ -120,6 +119,11 @@ static inline int cpuidle_get_last_residency(struct cpuidle_device *dev)
struct cpuidle_driver {
char name[CPUIDLE_NAME_LEN];
struct module *owner;
unsigned int power_specified:1;
struct cpuidle_state states[CPUIDLE_STATE_MAX];
int state_count;
int safe_state_index;
};
#ifdef CONFIG_CPU_IDLE
@ -166,10 +170,13 @@ struct cpuidle_governor {
struct list_head governor_list;
unsigned int rating;
int (*enable) (struct cpuidle_device *dev);
void (*disable) (struct cpuidle_device *dev);
int (*enable) (struct cpuidle_driver *drv,
struct cpuidle_device *dev);
void (*disable) (struct cpuidle_driver *drv,
struct cpuidle_device *dev);
int (*select) (struct cpuidle_device *dev);
int (*select) (struct cpuidle_driver *drv,
struct cpuidle_device *dev);
void (*reflect) (struct cpuidle_device *dev, int index);
struct module *owner;