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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>
84 lines
1.9 KiB
C
84 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* sd_dif.c - SCSI Data Integrity Field
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*
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* Copyright (C) 2007, 2008 Oracle Corporation
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* Written by: Martin K. Petersen <martin.petersen@oracle.com>
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*/
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#include <linux/blkdev.h>
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#include <linux/t10-pi.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_driver.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_ioctl.h>
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#include <scsi/scsicam.h>
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#include "sd.h"
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/*
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* Configure exchange of protection information between OS and HBA.
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*/
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void sd_dif_config_host(struct scsi_disk *sdkp)
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{
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struct scsi_device *sdp = sdkp->device;
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struct gendisk *disk = sdkp->disk;
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u8 type = sdkp->protection_type;
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struct blk_integrity bi;
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int dif, dix;
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dif = scsi_host_dif_capable(sdp->host, type);
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dix = scsi_host_dix_capable(sdp->host, type);
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if (!dix && scsi_host_dix_capable(sdp->host, 0)) {
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dif = 0; dix = 1;
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}
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if (!dix)
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return;
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memset(&bi, 0, sizeof(bi));
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/* Enable DMA of protection information */
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if (scsi_host_get_guard(sdkp->device->host) & SHOST_DIX_GUARD_IP) {
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if (type == T10_PI_TYPE3_PROTECTION)
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bi.profile = &t10_pi_type3_ip;
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else
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bi.profile = &t10_pi_type1_ip;
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bi.flags |= BLK_INTEGRITY_IP_CHECKSUM;
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} else
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if (type == T10_PI_TYPE3_PROTECTION)
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bi.profile = &t10_pi_type3_crc;
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else
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bi.profile = &t10_pi_type1_crc;
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bi.tuple_size = sizeof(struct t10_pi_tuple);
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sd_printk(KERN_NOTICE, sdkp,
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"Enabling DIX %s protection\n", bi.profile->name);
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if (dif && type) {
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bi.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
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if (!sdkp->ATO)
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goto out;
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if (type == T10_PI_TYPE3_PROTECTION)
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bi.tag_size = sizeof(u16) + sizeof(u32);
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else
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bi.tag_size = sizeof(u16);
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sd_printk(KERN_NOTICE, sdkp, "DIF application tag size %u\n",
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bi.tag_size);
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}
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out:
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blk_integrity_register(disk, &bi);
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}
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