linux-imx

/*

* Filename: dev.c

*

*

* Authors: Joshua Morris <josh.h.morris@us.ibm.com>

*   Philip Kelleher <pjk1939@linux.vnet.ibm.com>

*

* (C) Copyright 2013 IBM Corporation

*

* This program is free software; you can redistribute it and/or

* modify it under the terms of the GNU General Public License as

* published by the Free Software Foundation; either version 2 of the

* License, or (at your option) any later version.

*

* This program is distributed in the hope that 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

*/

​

#include <linux/kernel.h>

#include <linux/interrupt.h>

#include <linux/module.h>

#include <linux/pci.h>

#include <linux/slab.h>

​

#include <linux/hdreg.h>

#include <linux/genhd.h>

#include <linux/blkdev.h>

#include <linux/bio.h>

​

#include <linux/fs.h>

​

#include "rsxx_priv.h"

​

static unsigned int blkdev_minors = 64;

module_param(blkdev_minors, uint, 0444);

MODULE_PARM_DESC(blkdev_minors, "Number of minors(partitions)");

​

/*

 * For now I'm making this tweakable in case any applications hit this limit.

 * If you see a "bio too big" error in the log you will need to raise this

 * value.

 */

static unsigned int blkdev_max_hw_sectors = 1024;

module_param(blkdev_max_hw_sectors, uint, 0444);

MODULE_PARM_DESC(blkdev_max_hw_sectors, "Max hw sectors for a single BIO");

​

static unsigned int enable_blkdev = 1;

module_param(enable_blkdev , uint, 0444);

MODULE_PARM_DESC(enable_blkdev, "Enable block device interfaces");

​

​

struct rsxx_bio_meta {

    struct bio  *bio;

    atomic_t    pending_dmas;

    atomic_t    error;

    unsigned long   start_time;

};