From: Preeti U Murthy <preeti@xxxxxxxxxxxxxxxxxx> On certain bios,resume hangs if cpus are allowed to enter idle states during suspend[1] This was fixed in apci idle driver[2].But intel_idle driver does not have this fix.Thus instead of replicating the fix in both the idle drivers,or in more platform specific idle drivers if needed,the more general cpuidle infrastructure could handle this. A suspend callback in cpuidle_driver could handle this fix.But a cpuidle_driver provides only basic functionalities like platform idle state detection capability and mechanisms to support entry and exit into CPU idle states.All other cpuidle functions are found in the cpuidle generic infrastructure for good reason that all cpuidle drivers,irrepective of their platforms will support these functions. One option therefore would be to register a suspend callback in cpuidle which handles this fix.This could be called through a PM_SUSPEND_PREPARE notifier.But this is too generic a notfier for a driver to handle. Also,ideally the job of cpuidle is not to handle side effects of suspend. It should expose the interfaces which "handle cpuidle 'during' suspend" or any other operation,which the subsystems call during that respective operation. The fix demands that during suspend,no cpus should be allowed to enter deep C-states.The interface cpuidle_uninstall_idle_handler() in cpuidle ensures that.Not just that it also kicks all the cpus which are already in idle out of their idle states which was being done during cpu hotplug through a CPU_DYING_FROZEN callbacks. Now the question arises about when during suspend should cpuidle_uninstall_idle_handler() be called.Since we are dealing with drivers it seems best to call this function during dpm_suspend(). Delaying the call till dpm_suspend_noirq() does no harm,as long as it is before cpu_hotplug_begin() to avoid race conditions with cpu hotpulg operations.In dpm_suspend_noirq(),it would be wise to place this call before suspend_device_irqs() to avoid ugly interactions with the same. Ananlogously,during resume. References: 1.https://bugs.launchpad.net/ubuntu/+source/linux/+bug/674075. 2.http://marc.info/?l=linux-pm&m=133958534231884&w=2 Reported-by: Dave Hansen <dave@xxxxxxxxxxxxxxxxxx> Signed-off-by: Preeti U Murthy <preeti@xxxxxxxxxxxxxxxxxx> --- drivers/acpi/processor_idle.c | 30 +----------------------------- drivers/base/power/main.c | 4 +++- drivers/cpuidle/cpuidle.c | 16 ++++++++++++++++ include/linux/cpuidle.h | 2 ++ 4 files changed, 22 insertions(+), 30 deletions(-) diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index 6d9ec3e..b894627 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -221,10 +221,6 @@ static void lapic_timer_state_broadcast(struct acpi_processor *pr, #endif -/* - * Suspend / resume control - */ -static int acpi_idle_suspend; static u32 saved_bm_rld; static void acpi_idle_bm_rld_save(void) @@ -243,21 +239,13 @@ static void acpi_idle_bm_rld_restore(void) int acpi_processor_suspend(struct device *dev) { - if (acpi_idle_suspend == 1) - return 0; - acpi_idle_bm_rld_save(); - acpi_idle_suspend = 1; return 0; } int acpi_processor_resume(struct device *dev) { - if (acpi_idle_suspend == 0) - return 0; - acpi_idle_bm_rld_restore(); - acpi_idle_suspend = 0; return 0; } @@ -763,11 +751,6 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev, local_irq_disable(); - if (acpi_idle_suspend) { - local_irq_enable(); - cpu_relax(); - return -EBUSY; - } lapic_timer_state_broadcast(pr, cx, 1); kt1 = ktime_get_real(); @@ -838,11 +821,6 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev, local_irq_disable(); - if (acpi_idle_suspend) { - local_irq_enable(); - cpu_relax(); - return -EBUSY; - } if (cx->entry_method != ACPI_CSTATE_FFH) { current_thread_info()->status &= ~TS_POLLING; @@ -928,8 +906,7 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev, drv, drv->safe_state_index); } else { local_irq_disable(); - if (!acpi_idle_suspend) - acpi_safe_halt(); + acpi_safe_halt(); local_irq_enable(); return -EBUSY; } @@ -937,11 +914,6 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev, local_irq_disable(); - if (acpi_idle_suspend) { - local_irq_enable(); - cpu_relax(); - return -EBUSY; - } if (cx->entry_method != ACPI_CSTATE_FFH) { current_thread_info()->status &= ~TS_POLLING; diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index df5f41d..d791950 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -28,7 +28,7 @@ #include <linux/sched.h> #include <linux/async.h> #include <linux/suspend.h> - +#include <linux/cpuidle.h> #include "../base.h" #include "power.h" @@ -467,6 +467,7 @@ static void dpm_resume_noirq(pm_message_t state) mutex_unlock(&dpm_list_mtx); dpm_show_time(starttime, state, "noirq"); resume_device_irqs(); + cpuidle_resume(); } /** @@ -867,6 +868,7 @@ static int dpm_suspend_noirq(pm_message_t state) ktime_t starttime = ktime_get(); int error = 0; + cpuidle_pause(); suspend_device_irqs(); mutex_lock(&dpm_list_mtx); while (!list_empty(&dpm_late_early_list)) { diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index 0132706..d6a533e 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -201,6 +201,22 @@ void cpuidle_resume_and_unlock(void) EXPORT_SYMBOL_GPL(cpuidle_resume_and_unlock); +/* Currently used in suspend/resume path to suspend cpuidle */ +void cpuidle_pause(void) +{ + mutex_lock(&cpuidle_lock); + cpuidle_uninstall_idle_handler(); + mutex_unlock(&cpuidle_lock); +} + +/* Currently used in suspend/resume path to resume cpuidle */ +void cpuidle_resume(void) +{ + mutex_lock(&cpuidle_lock); + cpuidle_install_idle_handler(); + mutex_unlock(&cpuidle_lock); +} + /** * cpuidle_wrap_enter - performs timekeeping and irqen around enter function * @dev: pointer to a valid cpuidle_device object diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h index 8684a0d..d83b27e 100644 --- a/include/linux/cpuidle.h +++ b/include/linux/cpuidle.h @@ -146,6 +146,8 @@ extern void cpuidle_unregister_device(struct cpuidle_device *dev); extern void cpuidle_pause_and_lock(void); extern void cpuidle_resume_and_unlock(void); +extern void cpuidle_pause(void); +extern void cpuidle_resume(void); extern int cpuidle_enable_device(struct cpuidle_device *dev); extern void cpuidle_disable_device(struct cpuidle_device *dev); extern int cpuidle_wrap_enter(struct cpuidle_device *dev, -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
