linux-imx

/*

 * pcrypt - Parallel crypto wrapper.

 *

 * Copyright (C) 2009 secunet Security Networks AG

 * Copyright (C) 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.

 */

​

#include <crypto/algapi.h>

#include <crypto/internal/aead.h>

#include <linux/atomic.h>

#include <linux/err.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/notifier.h>

#include <linux/kobject.h>

#include <linux/cpu.h>

#include <crypto/pcrypt.h>

​

struct padata_pcrypt {

    struct padata_instance *pinst;

    struct workqueue_struct *wq;

​

    /*

     * Cpumask for callback CPUs. It should be

     * equal to serial cpumask of corresponding padata instance,

     * so it is updated when padata notifies us about serial

     * cpumask change.

     *

     * cb_cpumask is protected by RCU. This fact prevents us from

     * using cpumask_var_t directly because the actual type of

     * cpumsak_var_t depends on kernel configuration(particularly on

     * CONFIG_CPUMASK_OFFSTACK macro). Depending on the configuration

     * cpumask_var_t may be either a pointer to the struct cpumask

     * or a variable allocated on the stack. Thus we can not safely use

     * cpumask_var_t with RCU operations such as rcu_assign_pointer or

     * rcu_dereference. So cpumask_var_t is wrapped with struct

     * pcrypt_cpumask which makes possible to use it with RCU.

     */

    struct pcrypt_cpumask {

        cpumask_var_t mask;

    } *cb_cpumask;

    struct notifier_block nblock;

};

​

static struct padata_pcrypt pencrypt;

static struct padata_pcrypt pdecrypt;

static struct kset           *pcrypt_kset;

​

struct pcrypt_instance_ctx {