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Tip revision: f76349cf41451c5c42a99f18a9163377e4b364ff authored by Linus Torvalds on 25 September 2022, 21:01:02 UTC
Linux 6.0-rc7
Linux 6.0-rc7
Tip revision: f76349c
sd_dif.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/blk-integrity.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);
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,
"Enabling DIX %s, application tag size %u bytes\n",
bi.profile->name, bi.tag_size);
out:
blk_integrity_register(disk, &bi);
}