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powerpc/pseries/cpuidle: Use cpuidle_register() for initialisation. 

This patch replaces the cpuidle driver and devices initialisation
calls with a single generic cpuidle_register() call
and also includes minor refactoring of the code around it.

Remove the cpu online check in snooze loop, as this code can
only locally run on a cpu only if it is online. Therefore,
this check is not required.

Signed-off-by: Deepthi Dharwar <deepthi@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Deepthi Dharwar 2014-01-14 16:26:09 +05:30 committed by Benjamin Herrenschmidt
parent 962e7bd497
commit b69dbba059
1 changed files with 11 additions and 67 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

78
drivers/cpuidle/cpuidle-pseries.c
View File

@ -27,7 +27,6 @@ struct cpuidle_driver pseries_idle_driver = {
#define MAX_IDLE_STATE_COUNT 2
static int max_idle_state = MAX_IDLE_STATE_COUNT - 1;
static struct cpuidle_device __percpu *pseries_cpuidle_devices;
static struct cpuidle_state *cpuidle_state_table;
static inline void idle_loop_prolog(unsigned long *in_purr)
@ -55,13 +54,12 @@ static int snooze_loop(struct cpuidle_device *dev,
int index)
{
unsigned long in_purr;
int cpu = dev->cpu;
idle_loop_prolog(&in_purr);
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
while ((!need_resched()) && cpu_online(cpu)) {
while (!need_resched()) {
HMT_low();
HMT_very_low();
}
@ -188,7 +186,7 @@ static int pseries_cpuidle_add_cpu_notifier(struct notifier_block *n,
{
int hotcpu = (unsigned long)hcpu;
struct cpuidle_device *dev =
per_cpu_ptr(pseries_cpuidle_devices, hotcpu);
per_cpu(cpuidle_devices, hotcpu);
if (dev && cpuidle_get_driver()) {
switch (action) {
@ -245,50 +243,6 @@ static int pseries_cpuidle_driver_init(void)
return 0;
}
/* pseries_idle_devices_uninit(void)
* unregister cpuidle devices and de-allocate memory
*/
static void pseries_idle_devices_uninit(void)
{
int i;
struct cpuidle_device *dev;
for_each_possible_cpu(i) {
dev = per_cpu_ptr(pseries_cpuidle_devices, i);
cpuidle_unregister_device(dev);
}
free_percpu(pseries_cpuidle_devices);
return;
}
/* pseries_idle_devices_init()
* allocate, initialize and register cpuidle device
*/
static int pseries_idle_devices_init(void)
{
int i;
struct cpuidle_driver *drv = &pseries_idle_driver;
struct cpuidle_device *dev;
pseries_cpuidle_devices = alloc_percpu(struct cpuidle_device);
if (pseries_cpuidle_devices == NULL)
return -ENOMEM;
for_each_possible_cpu(i) {
dev = per_cpu_ptr(pseries_cpuidle_devices, i);
dev->state_count = drv->state_count;
dev->cpu = i;
if (cpuidle_register_device(dev)) {
printk(KERN_DEBUG \
"cpuidle_register_device %d failed!\n", i);
return -EIO;
}
}
return 0;
}
/*
* pseries_idle_probe()
* Choose state table for shared versus dedicated partition
@ -296,9 +250,6 @@ static int pseries_idle_devices_init(void)
static int pseries_idle_probe(void)
{
if (!firmware_has_feature(FW_FEATURE_SPLPAR))
return -ENODEV;
if (cpuidle_disable != IDLE_NO_OVERRIDE)
return -ENODEV;
@ -307,10 +258,13 @@ static int pseries_idle_probe(void)
return -EPERM;
}
if (lppaca_shared_proc(get_lppaca()))
cpuidle_state_table = shared_states;
else
cpuidle_state_table = dedicated_states;
if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
if (lppaca_shared_proc(get_lppaca()))
cpuidle_state_table = shared_states;
else
cpuidle_state_table = dedicated_states;
} else
return -ENODEV;
return 0;
}
@ -324,22 +278,14 @@ static int __init pseries_processor_idle_init(void)
return retval;
pseries_cpuidle_driver_init();
retval = cpuidle_register_driver(&pseries_idle_driver);
retval = cpuidle_register(&pseries_idle_driver, NULL);
if (retval) {
printk(KERN_DEBUG "Registration of pseries driver failed.\n");
return retval;
}
retval = pseries_idle_devices_init();
if (retval) {
pseries_idle_devices_uninit();
cpuidle_unregister_driver(&pseries_idle_driver);
return retval;
}
register_cpu_notifier(&setup_hotplug_notifier);
printk(KERN_DEBUG "pseries_idle_driver registered\n");
return 0;
}
@ -347,9 +293,7 @@ static void __exit pseries_processor_idle_exit(void)
{
unregister_cpu_notifier(&setup_hotplug_notifier);
pseries_idle_devices_uninit();
cpuidle_unregister_driver(&pseries_idle_driver);
cpuidle_unregister(&pseries_idle_driver);
return;
}