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Commit 622ade3a authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

Merge branch 'pm-cpuidle' 

* pm-cpuidle:
  intel_idle: Graceful probe failure when MWAIT is disabled
  cpuidle: Avoid assignment in if () argument
  cpuidle: Clean up cpuidle_enable_device() error handling a bit
  cpuidle: ladder: Add per CPU PM QoS resume latency support
  ARM: cpuidle: Refactor rollback operations if init fails
  ARM: cpuidle: Correct driver unregistration if init fails
  intel_idle: replace conditionals with static_cpu_has(X86_FEATURE_ARAT)
  cpuidle: fix broadcast control when broadcast can not be entered

 Conflicts:
	drivers/idle/intel_idle.c
parents 4762573b a4c44753

drivers/cpuidle/cpuidle-arm.c

+88 −65
Original line number Diff line number Diff line
@@ -72,25 +72,21 @@ static const struct of_device_id arm_idle_state_match[] __initconst = { 
};



/*

 * arm_idle_init

 * arm_idle_init_cpu

 *

 * Registers the arm specific cpuidle driver with the cpuidle

 * framework. It relies on core code to parse the idle states

 * and initialize them using driver data structures accordingly.

 */

static int __init arm_idle_init(void)

static int __init arm_idle_init_cpu(int cpu)

{

	int cpu, ret;

	int ret;

	struct cpuidle_driver *drv;

	struct cpuidle_device *dev;



	for_each_possible_cpu(cpu) {



	drv = kmemdup(&arm_idle_driver, sizeof(*drv), GFP_KERNEL);

		if (!drv) {

			ret = -ENOMEM;

			goto out_fail;

		}

	if (!drv)

		return -ENOMEM;



	drv->cpumask = (struct cpumask *)cpumask_of(cpu);
@@ -104,13 +100,13 @@ static int __init arm_idle_init(void) 
	ret = dt_init_idle_driver(drv, arm_idle_state_match, 1);

	if (ret <= 0) {

		ret = ret ? : -ENODEV;

			goto init_fail;

		goto out_kfree_drv;

	}



	ret = cpuidle_register_driver(drv);

	if (ret) {

		pr_err("Failed to register cpuidle driver\n");

			goto init_fail;

		goto out_kfree_drv;

	}



	/*
@@ -124,18 +120,18 @@ static int __init arm_idle_init(void) 
	 * failure is a HW misconfiguration/breakage (-ENXIO).

	 */

	if (ret == -ENXIO)

			continue;

		return 0;



	if (ret) {

		pr_err("CPU %d failed to init idle CPU ops\n", cpu);

			goto out_fail;

		goto out_unregister_drv;

	}



	dev = kzalloc(sizeof(*dev), GFP_KERNEL);

	if (!dev) {

		pr_err("Failed to allocate cpuidle device\n");

		ret = -ENOMEM;

			goto out_fail;

		goto out_unregister_drv;

	}

	dev->cpu = cpu;
@@ -143,21 +139,48 @@ static int __init arm_idle_init(void) 
	if (ret) {

		pr_err("Failed to register cpuidle device for CPU %d\n",

		       cpu);

		goto out_kfree_dev;

	}



	return 0;



out_kfree_dev:

	kfree(dev);

			goto out_fail;

out_unregister_drv:

	cpuidle_unregister_driver(drv);

out_kfree_drv:

	kfree(drv);

	return ret;

}



/*

 * arm_idle_init - Initializes arm cpuidle driver

 *

 * Initializes arm cpuidle driver for all CPUs, if any CPU fails

 * to register cpuidle driver then rollback to cancel all CPUs

 * registeration.

 */

static int __init arm_idle_init(void)

{

	int cpu, ret;

	struct cpuidle_driver *drv;

	struct cpuidle_device *dev;



	for_each_possible_cpu(cpu) {

		ret = arm_idle_init_cpu(cpu);

		if (ret)

			goto out_fail;

	}



	return 0;

init_fail:

	kfree(drv);



out_fail:

	while (--cpu >= 0) {

		dev = per_cpu(cpuidle_devices, cpu);

		drv = cpuidle_get_cpu_driver(dev);

		cpuidle_unregister_device(dev);

		kfree(dev);

		drv = cpuidle_get_driver();

		cpuidle_unregister_driver(drv);

		kfree(dev);

		kfree(drv);

	}

drivers/cpuidle/cpuidle.c

+10 −4
Original line number Diff line number Diff line
@@ -208,6 +208,7 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv, 
			return -EBUSY;

		}

		target_state = &drv->states[index];

		broadcast = false;

	}



	/* Take note of the planned idle state. */
@@ -387,9 +388,12 @@ int cpuidle_enable_device(struct cpuidle_device *dev) 
	if (dev->enabled)

		return 0;



	if (!cpuidle_curr_governor)

		return -EIO;



	drv = cpuidle_get_cpu_driver(dev);



	if (!drv || !cpuidle_curr_governor)

	if (!drv)

		return -EIO;



	if (!dev->registered)
@@ -399,9 +403,11 @@ int cpuidle_enable_device(struct cpuidle_device *dev) 
	if (ret)

		return ret;



	if (cpuidle_curr_governor->enable &&

	    (ret = cpuidle_curr_governor->enable(drv, dev)))

	if (cpuidle_curr_governor->enable) {

		ret = cpuidle_curr_governor->enable(drv, dev);

		if (ret)

			goto fail_sysfs;

	}



	smp_wmb();

drivers/cpuidle/governors/ladder.c

+7 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
#include <linux/pm_qos.h>

#include <linux/jiffies.h>

#include <linux/tick.h>

#include <linux/cpu.h>



#include <asm/io.h>

#include <linux/uaccess.h>
@@ -67,10 +68,16 @@ static int ladder_select_state(struct cpuidle_driver *drv, 
				struct cpuidle_device *dev)

{

	struct ladder_device *ldev = this_cpu_ptr(&ladder_devices);

	struct device *device = get_cpu_device(dev->cpu);

	struct ladder_device_state *last_state;

	int last_residency, last_idx = ldev->last_state_idx;

	int first_idx = drv->states[0].flags & CPUIDLE_FLAG_POLLING ? 1 : 0;

	int latency_req = pm_qos_request(PM_QOS_CPU_DMA_LATENCY);

	int resume_latency = dev_pm_qos_raw_read_value(device);



	if (resume_latency < latency_req &&

	    resume_latency != PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)

		latency_req = resume_latency;



	/* Special case when user has set very strict latency requirement */

	if (unlikely(latency_req == 0)) {

drivers/idle/intel_idle.c

+17 −6
Original line number Diff line number Diff line
@@ -913,10 +913,9 @@ static __cpuidle int intel_idle(struct cpuidle_device *dev, 
	struct cpuidle_state *state = &drv->states[index];

	unsigned long eax = flg2MWAIT(state->flags);

	unsigned int cstate;

	bool uninitialized_var(tick);

	int cpu = smp_processor_id();



	cstate = (((eax) >> MWAIT_SUBSTATE_SIZE) & MWAIT_CSTATE_MASK) + 1;



	/*

	 * leave_mm() to avoid costly and often unnecessary wakeups

	 * for flushing the user TLB's associated with the active mm.
@@ -924,12 +923,19 @@ static __cpuidle int intel_idle(struct cpuidle_device *dev, 
	if (state->flags & CPUIDLE_FLAG_TLB_FLUSHED)

		leave_mm(cpu);



	if (!(lapic_timer_reliable_states & (1 << (cstate))))

	if (!static_cpu_has(X86_FEATURE_ARAT)) {

		cstate = (((eax) >> MWAIT_SUBSTATE_SIZE) &

				MWAIT_CSTATE_MASK) + 1;

		tick = false;

		if (!(lapic_timer_reliable_states & (1 << (cstate)))) {

			tick = true;

			tick_broadcast_enter();

		}

	}



	mwait_idle_with_hints(eax, ecx);



	if (!(lapic_timer_reliable_states & (1 << (cstate))))

	if (!static_cpu_has(X86_FEATURE_ARAT) && tick)

		tick_broadcast_exit();



	return index;
@@ -1061,7 +1067,7 @@ static const struct idle_cpu idle_cpu_dnv = { 
};



#define ICPU(model, cpu) \

	{ X86_VENDOR_INTEL, 6, model, X86_FEATURE_MWAIT, (unsigned long)&cpu }

	{ X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (unsigned long)&cpu }



static const struct x86_cpu_id intel_idle_ids[] __initconst = {

	ICPU(INTEL_FAM6_NEHALEM_EP,		idle_cpu_nehalem),
@@ -1125,6 +1131,11 @@ static int __init intel_idle_probe(void) 
		return -ENODEV;

	}



	if (!boot_cpu_has(X86_FEATURE_MWAIT)) {

		pr_debug("Please enable MWAIT in BIOS SETUP\n");

		return -ENODEV;

	}



	if (boot_cpu_data.cpuid_level < CPUID_MWAIT_LEAF)

		return -ENODEV;