linux-imx

/*

 * sd_dif.c - SCSI Data Integrity Field

 *

 * Copyright (C) 2007, 2008 Oracle Corporation

 * Written by: Martin K. Petersen <martin.petersen@oracle.com>

 *

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

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

 * 2 as published by the Free Software Foundation.

 *

 * 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; see the file COPYING.  If not, write to

 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,

 * USA.

 *

 */

​

#include <linux/blkdev.h>

#include <linux/t10-pi.h>

​

#include <scsi/scsi.h>

#include <scsi/scsi_cmnd.h>

#include <scsi/scsi_dbg.h>

#include <scsi/scsi_device.h>

#include <scsi/scsi_driver.h>

#include <scsi/scsi_eh.h>

#include <scsi/scsi_host.h>

#include <scsi/scsi_ioctl.h>

#include <scsi/scsicam.h>

​

#include "sd.h"

​

/*

 * Configure exchange of protection information between OS and HBA.

 */

void sd_dif_config_host(struct scsi_disk *sdkp)

{

    struct scsi_device *sdp = sdkp->device;

    struct gendisk *disk = sdkp->disk;

    u8 type = sdkp->protection_type;

    struct blk_integrity bi;

    int dif, dix;

​

    dif = scsi_host_dif_capable(sdp->host, type);

    dix = scsi_host_dix_capable(sdp->host, type);

​

    if (!dix && scsi_host_dix_capable(sdp->host, 0)) {

        dif = 0; dix = 1;

    }

​

    if (!dix)

        return;

​

    memset(&bi, 0, sizeof(bi));

​

    /* Enable DMA of protection information */

    if (scsi_host_get_guard(sdkp->device->host) & SHOST_DIX_GUARD_IP) {

        if (type == T10_PI_TYPE3_PROTECTION)