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Diffstat (limited to 'kernel/include/linux/padata.h')
| -rw-r--r-- | kernel/include/linux/padata.h | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/kernel/include/linux/padata.h b/kernel/include/linux/padata.h new file mode 100644 index 000000000..438694650 --- /dev/null +++ b/kernel/include/linux/padata.h @@ -0,0 +1,189 @@ +/* + * padata.h - header for the padata parallelization interface + * + * Copyright (C) 2008, 2009 secunet Security Networks AG + * Copyright (C) 2008, 2009 Steffen Klassert <steffen.klassert@secunet.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#ifndef PADATA_H +#define PADATA_H + +#include <linux/workqueue.h> +#include <linux/spinlock.h> +#include <linux/list.h> +#include <linux/timer.h> +#include <linux/notifier.h> +#include <linux/kobject.h> + +#define PADATA_CPU_SERIAL 0x01 +#define PADATA_CPU_PARALLEL 0x02 + +/** + * struct padata_priv - Embedded to the users data structure. + * + * @list: List entry, to attach to the padata lists. + * @pd: Pointer to the internal control structure. + * @cb_cpu: Callback cpu for serializatioon. + * @seq_nr: Sequence number of the parallelized data object. + * @info: Used to pass information from the parallel to the serial function. + * @parallel: Parallel execution function. + * @serial: Serial complete function. + */ +struct padata_priv { + struct list_head list; + struct parallel_data *pd; + int cb_cpu; + int info; + void (*parallel)(struct padata_priv *padata); + void (*serial)(struct padata_priv *padata); +}; + +/** + * struct padata_list + * + * @list: List head. + * @lock: List lock. + */ +struct padata_list { + struct list_head list; + spinlock_t lock; +}; + +/** +* struct padata_serial_queue - The percpu padata serial queue +* +* @serial: List to wait for serialization after reordering. +* @work: work struct for serialization. +* @pd: Backpointer to the internal control structure. +*/ +struct padata_serial_queue { + struct padata_list serial; + struct work_struct work; + struct parallel_data *pd; +}; + +/** + * struct padata_parallel_queue - The percpu padata parallel queue + * + * @parallel: List to wait for parallelization. + * @reorder: List to wait for reordering after parallel processing. + * @serial: List to wait for serialization after reordering. + * @pwork: work struct for parallelization. + * @swork: work struct for serialization. + * @pd: Backpointer to the internal control structure. + * @work: work struct for parallelization. + * @num_obj: Number of objects that are processed by this cpu. + * @cpu_index: Index of the cpu. + */ +struct padata_parallel_queue { + struct padata_list parallel; + struct padata_list reorder; + struct parallel_data *pd; + struct work_struct work; + atomic_t num_obj; + int cpu_index; +}; + +/** + * struct padata_cpumask - The cpumasks for the parallel/serial workers + * + * @pcpu: cpumask for the parallel workers. + * @cbcpu: cpumask for the serial (callback) workers. + */ +struct padata_cpumask { + cpumask_var_t pcpu; + cpumask_var_t cbcpu; +}; + +/** + * struct parallel_data - Internal control structure, covers everything + * that depends on the cpumask in use. + * + * @pinst: padata instance. + * @pqueue: percpu padata queues used for parallelization. + * @squeue: percpu padata queues used for serialuzation. + * @reorder_objects: Number of objects waiting in the reorder queues. + * @refcnt: Number of objects holding a reference on this parallel_data. + * @max_seq_nr: Maximal used sequence number. + * @cpumask: The cpumasks in use for parallel and serial workers. + * @lock: Reorder lock. + * @processed: Number of already processed objects. + * @timer: Reorder timer. + */ +struct parallel_data { + struct padata_instance *pinst; + struct padata_parallel_queue __percpu *pqueue; + struct padata_serial_queue __percpu *squeue; + atomic_t reorder_objects; + atomic_t refcnt; + atomic_t seq_nr; + struct padata_cpumask cpumask; + spinlock_t lock ____cacheline_aligned; + unsigned int processed; + struct timer_list timer; +}; + +/** + * struct padata_instance - The overall control structure. + * + * @cpu_notifier: cpu hotplug notifier. + * @wq: The workqueue in use. + * @pd: The internal control structure. + * @cpumask: User supplied cpumasks for parallel and serial works. + * @cpumask_change_notifier: Notifiers chain for user-defined notify + * callbacks that will be called when either @pcpu or @cbcpu + * or both cpumasks change. + * @kobj: padata instance kernel object. + * @lock: padata instance lock. + * @flags: padata flags. + */ +struct padata_instance { + struct notifier_block cpu_notifier; + struct workqueue_struct *wq; + struct parallel_data *pd; + struct padata_cpumask cpumask; + struct blocking_notifier_head cpumask_change_notifier; + struct kobject kobj; + struct mutex lock; + u8 flags; +#define PADATA_INIT 1 +#define PADATA_RESET 2 +#define PADATA_INVALID 4 +}; + +extern struct padata_instance *padata_alloc_possible( + struct workqueue_struct *wq); +extern struct padata_instance *padata_alloc(struct workqueue_struct *wq, + const struct cpumask *pcpumask, + const struct cpumask *cbcpumask); +extern void padata_free(struct padata_instance *pinst); +extern int padata_do_parallel(struct padata_instance *pinst, + struct padata_priv *padata, int cb_cpu); +extern void padata_do_serial(struct padata_priv *padata); +extern int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type, + cpumask_var_t cpumask); +extern int padata_set_cpumasks(struct padata_instance *pinst, + cpumask_var_t pcpumask, + cpumask_var_t cbcpumask); +extern int padata_add_cpu(struct padata_instance *pinst, int cpu, int mask); +extern int padata_remove_cpu(struct padata_instance *pinst, int cpu, int mask); +extern int padata_start(struct padata_instance *pinst); +extern void padata_stop(struct padata_instance *pinst); +extern int padata_register_cpumask_notifier(struct padata_instance *pinst, + struct notifier_block *nblock); +extern int padata_unregister_cpumask_notifier(struct padata_instance *pinst, + struct notifier_block *nblock); +#endif |