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padata: Convert to hotplug state machine 

Install the callbacks via the state machine. CPU-hotplug multinstance support
is used with the nocalls() version. Maybe parts of padata_alloc() could be
moved into the online callback so that we could invoke ->startup callback for
instance and drop get_online_cpus().

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-crypto@vger.kernel.org
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160906170457.32393-14-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2016-09-06 19:04:49 +02:00 committed by Thomas Gleixner
parent 27622b061e
commit 30e92153b4
2 changed files with 53 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/padata.h
View File

@ -151,7 +151,7 @@ struct parallel_data {
* @flags: padata flags.
*/
struct padata_instance {
struct notifier_block cpu_notifier;
struct hlist_node node;
struct workqueue_struct *wq;
struct parallel_data *pd;
struct padata_cpumask cpumask;

92
kernel/padata.c
View File

@ -30,6 +30,7 @@
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/rcupdate.h>
#include <linux/module.h>
#define MAX_OBJ_NUM 1000
@ -769,52 +770,43 @@ static inline int pinst_has_cpu(struct padata_instance *pinst, int cpu)
cpumask_test_cpu(cpu, pinst->cpumask.cbcpu);
}
static int padata_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
static int padata_cpu_online(unsigned int cpu, struct hlist_node *node)
{
int err;
struct padata_instance *pinst;
int cpu = (unsigned long)hcpu;
int ret;
pinst = container_of(nfb, struct padata_instance, cpu_notifier);
pinst = hlist_entry_safe(node, struct padata_instance, node);
if (!pinst_has_cpu(pinst, cpu))
return 0;
switch (action) {
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
case CPU_DOWN_FAILED:
case CPU_DOWN_FAILED_FROZEN:
if (!pinst_has_cpu(pinst, cpu))
break;
mutex_lock(&pinst->lock);
err = __padata_add_cpu(pinst, cpu);
mutex_unlock(&pinst->lock);
if (err)
return notifier_from_errno(err);
break;
case CPU_DOWN_PREPARE:
case CPU_DOWN_PREPARE_FROZEN:
case CPU_UP_CANCELED:
case CPU_UP_CANCELED_FROZEN:
if (!pinst_has_cpu(pinst, cpu))
break;
mutex_lock(&pinst->lock);
err = __padata_remove_cpu(pinst, cpu);
mutex_unlock(&pinst->lock);
if (err)
return notifier_from_errno(err);
break;
}
return NOTIFY_OK;
mutex_lock(&pinst->lock);
ret = __padata_add_cpu(pinst, cpu);
mutex_unlock(&pinst->lock);
return ret;
}
static int padata_cpu_prep_down(unsigned int cpu, struct hlist_node *node)
{
struct padata_instance *pinst;
int ret;
pinst = hlist_entry_safe(node, struct padata_instance, node);
if (!pinst_has_cpu(pinst, cpu))
return 0;
mutex_lock(&pinst->lock);
ret = __padata_remove_cpu(pinst, cpu);
mutex_unlock(&pinst->lock);
return ret;
}
static enum cpuhp_state hp_online;
#endif
static void __padata_free(struct padata_instance *pinst)
{
#ifdef CONFIG_HOTPLUG_CPU
unregister_hotcpu_notifier(&pinst->cpu_notifier);
cpuhp_state_remove_instance_nocalls(hp_online, &pinst->node);
#endif
padata_stop(pinst);
@ -1012,11 +1004,8 @@ struct padata_instance *padata_alloc(struct workqueue_struct *wq,
mutex_init(&pinst->lock);
#ifdef CONFIG_HOTPLUG_CPU
pinst->cpu_notifier.notifier_call = padata_cpu_callback;
pinst->cpu_notifier.priority = 0;
register_hotcpu_notifier(&pinst->cpu_notifier);
cpuhp_state_add_instance_nocalls(hp_online, &pinst->node);
#endif
return pinst;
err_free_masks:
@ -1039,3 +1028,26 @@ void padata_free(struct padata_instance *pinst)
kobject_put(&pinst->kobj);
}
EXPORT_SYMBOL(padata_free);
#ifdef CONFIG_HOTPLUG_CPU
static __init int padata_driver_init(void)
{
int ret;
ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "padata:online",
padata_cpu_online,
padata_cpu_prep_down);
if (ret < 0)
return ret;
hp_online = ret;
return 0;
}
module_init(padata_driver_init);
static __exit void padata_driver_exit(void)
{
cpuhp_remove_multi_state(hp_online);
}
module_exit(padata_driver_exit);
#endif