linux-stable/drivers/scsi/sd_dif.c
Thomas Gleixner a98c5b1965 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 410
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 3 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190531190112.675111872@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:37:14 +02:00

83 lines
1.9 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* sd_dif.c - SCSI Data Integrity Field
*
* Copyright (C) 2007, 2008 Oracle Corporation
* Written by: Martin K. Petersen <martin.petersen@oracle.com>
*/
#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)
bi.profile = &t10_pi_type3_ip;
else
bi.profile = &t10_pi_type1_ip;
bi.flags |= BLK_INTEGRITY_IP_CHECKSUM;
} else
if (type == T10_PI_TYPE3_PROTECTION)
bi.profile = &t10_pi_type3_crc;
else
bi.profile = &t10_pi_type1_crc;
bi.tuple_size = sizeof(struct t10_pi_tuple);
sd_printk(KERN_NOTICE, sdkp,
"Enabling DIX %s protection\n", bi.profile->name);
if (dif && type) {
bi.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
if (!sdkp->ATO)
goto out;
if (type == T10_PI_TYPE3_PROTECTION)
bi.tag_size = sizeof(u16) + sizeof(u32);
else
bi.tag_size = sizeof(u16);
sd_printk(KERN_NOTICE, sdkp, "DIF application tag size %u\n",
bi.tag_size);
}
out:
blk_integrity_register(disk, &bi);
}