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* padata.h - header for the padata parallelization interface
* Copyright (C) 2008, 2009 secunet Security Networks AG
* Copyright (C) 2008, 2009 Steffen Klassert <>
* 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>
* 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 seq_nr;
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_queue - The percpu padata queues.
* @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.
* @num_obj: Number of objects that are processed by this cpu.
* @cpu_index: Index of the cpu.
struct padata_queue {
struct padata_list parallel;
struct padata_list reorder;
struct padata_list serial;
struct work_struct pwork;
struct work_struct swork;
struct parallel_data *pd;
atomic_t num_obj;
int cpu_index;
* struct parallel_data - Internal control structure, covers everything
* that depends on the cpumask in use.
* @pinst: padata instance.
* @queue: percpu padata queues.
* @seq_nr: The sequence number that will be attached to the next object.
* @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: cpumask in use.
* @lock: Reorder lock.
* @timer: Reorder timer.
struct parallel_data {
struct padata_instance *pinst;
struct padata_queue *queue;
atomic_t seq_nr;
atomic_t reorder_objects;
atomic_t refcnt;
unsigned int max_seq_nr;
cpumask_var_t cpumask;
spinlock_t lock;
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 cpumask.
* @lock: padata instance lock.
* @flags: padata flags.
struct padata_instance {
struct notifier_block cpu_notifier;
struct workqueue_struct *wq;
struct parallel_data *pd;
cpumask_var_t cpumask;
struct mutex lock;
u8 flags;
#define PADATA_INIT 1
#define PADATA_RESET 2
extern struct padata_instance *padata_alloc(const struct cpumask *cpumask,
struct workqueue_struct *wq);
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,
cpumask_var_t cpumask);
extern int padata_add_cpu(struct padata_instance *pinst, int cpu);
extern int padata_remove_cpu(struct padata_instance *pinst, int cpu);
extern void padata_start(struct padata_instance *pinst);
extern void padata_stop(struct padata_instance *pinst);