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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
This commit is contained in:
Rafael J. Wysocki 2017-11-13 01:34:14 +01:00
parent 4762573b93 a4c447533a
commit 622ade3a2f
4 changed files with 122 additions and 75 deletions
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153
drivers/cpuidle/cpuidle-arm.c
View File

@ -72,12 +72,94 @@ 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_cpu(int cpu)
{
int ret;
struct cpuidle_driver *drv;
struct cpuidle_device *dev;
drv = kmemdup(&arm_idle_driver, sizeof(*drv), GFP_KERNEL);
if (!drv)
return -ENOMEM;
drv->cpumask = (struct cpumask *)cpumask_of(cpu);
/*
* Initialize idle states data, starting at index 1. This
* driver is DT only, if no DT idle states are detected (ret
* == 0) let the driver initialization fail accordingly since
* there is no reason to initialize the idle driver if only
* wfi is supported.
*/
ret = dt_init_idle_driver(drv, arm_idle_state_match, 1);
if (ret <= 0) {
ret = ret ? : -ENODEV;
goto out_kfree_drv;
}
ret = cpuidle_register_driver(drv);
if (ret) {
pr_err("Failed to register cpuidle driver\n");
goto out_kfree_drv;
}
/*
* Call arch CPU operations in order to initialize
* idle states suspend back-end specific data
*/
ret = arm_cpuidle_init(cpu);
/*
* Skip the cpuidle device initialization if the reported
* failure is a HW misconfiguration/breakage (-ENXIO).
*/
if (ret == -ENXIO)
return 0;
if (ret) {
pr_err("CPU %d failed to init idle CPU ops\n", cpu);
goto out_unregister_drv;
}
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev) {
pr_err("Failed to allocate cpuidle device\n");
ret = -ENOMEM;
goto out_unregister_drv;
}
dev->cpu = cpu;
ret = cpuidle_register_device(dev);
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);
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;
@ -85,79 +167,20 @@ static int __init arm_idle_init(void)
struct cpuidle_device *dev;
for_each_possible_cpu(cpu) {
drv = kmemdup(&arm_idle_driver, sizeof(*drv), GFP_KERNEL);
if (!drv) {
ret = -ENOMEM;
ret = arm_idle_init_cpu(cpu);
if (ret)
goto out_fail;
}
drv->cpumask = (struct cpumask *)cpumask_of(cpu);
/*
* Initialize idle states data, starting at index 1. This
* driver is DT only, if no DT idle states are detected (ret
* == 0) let the driver initialization fail accordingly since
* there is no reason to initialize the idle driver if only
* wfi is supported.
*/
ret = dt_init_idle_driver(drv, arm_idle_state_match, 1);
if (ret <= 0) {
ret = ret ? : -ENODEV;
goto init_fail;
}
ret = cpuidle_register_driver(drv);
if (ret) {
pr_err("Failed to register cpuidle driver\n");
goto init_fail;
}
/*
* Call arch CPU operations in order to initialize
* idle states suspend back-end specific data
*/
ret = arm_cpuidle_init(cpu);
/*
* Skip the cpuidle device initialization if the reported
* failure is a HW misconfiguration/breakage (-ENXIO).
*/
if (ret == -ENXIO)
continue;
if (ret) {
pr_err("CPU %d failed to init idle CPU ops\n", cpu);
goto out_fail;
}
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev) {
pr_err("Failed to allocate cpuidle device\n");
ret = -ENOMEM;
goto out_fail;
}
dev->cpu = cpu;
ret = cpuidle_register_device(dev);
if (ret) {
pr_err("Failed to register cpuidle device for CPU %d\n",
cpu);
kfree(dev);
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);
}

14
drivers/cpuidle/cpuidle.c
View File

@ -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)))
goto fail_sysfs;
if (cpuidle_curr_governor->enable) {
ret = cpuidle_curr_governor->enable(drv, dev);
if (ret)
goto fail_sysfs;
}
smp_wmb();

7
drivers/cpuidle/governors/ladder.c
View File

@ -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)) {

23
drivers/idle/intel_idle.c
View File

@ -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))))
tick_broadcast_enter();
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;