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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
parent 4202735e8a
commit 46bcfad7a8
16 changed files with 438 additions and 206 deletions
Show Stats 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;