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These should go together with the rest of the T10 protection information defintions. [mkp: s/T10_DIF/T10_PI/] Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
211 lines
5.3 KiB
C
211 lines
5.3 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
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* USA.
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*
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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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/*
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* The virtual start sector is the one that was originally submitted
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* by the block layer. Due to partitioning, MD/DM cloning, etc. the
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* actual physical start sector is likely to be different. Remap
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* protection information to match the physical LBA.
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*
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* From a protocol perspective there's a slight difference between
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* Type 1 and 2. The latter uses 32-byte CDBs exclusively, and the
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* reference tag is seeded in the CDB. This gives us the potential to
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* avoid virt->phys remapping during write. However, at read time we
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* don't know whether the virt sector is the same as when we wrote it
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* (we could be reading from real disk as opposed to MD/DM device. So
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* we always remap Type 2 making it identical to Type 1.
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*
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* Type 3 does not have a reference tag so no remapping is required.
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*/
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void sd_dif_prepare(struct scsi_cmnd *scmd)
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{
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const int tuple_sz = sizeof(struct t10_pi_tuple);
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struct bio *bio;
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struct scsi_disk *sdkp;
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struct t10_pi_tuple *pi;
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u32 phys, virt;
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sdkp = scsi_disk(scmd->request->rq_disk);
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if (sdkp->protection_type == T10_PI_TYPE3_PROTECTION)
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return;
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phys = scsi_prot_ref_tag(scmd);
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__rq_for_each_bio(bio, scmd->request) {
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struct bio_integrity_payload *bip = bio_integrity(bio);
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struct bio_vec iv;
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struct bvec_iter iter;
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unsigned int j;
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/* Already remapped? */
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if (bip->bip_flags & BIP_MAPPED_INTEGRITY)
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break;
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virt = bip_get_seed(bip) & 0xffffffff;
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bip_for_each_vec(iv, bip, iter) {
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pi = kmap_atomic(iv.bv_page) + iv.bv_offset;
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for (j = 0; j < iv.bv_len; j += tuple_sz, pi++) {
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if (be32_to_cpu(pi->ref_tag) == virt)
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pi->ref_tag = cpu_to_be32(phys);
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virt++;
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phys++;
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}
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kunmap_atomic(pi);
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}
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bip->bip_flags |= BIP_MAPPED_INTEGRITY;
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}
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}
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/*
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* Remap physical sector values in the reference tag to the virtual
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* values expected by the block layer.
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*/
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void sd_dif_complete(struct scsi_cmnd *scmd, unsigned int good_bytes)
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{
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const int tuple_sz = sizeof(struct t10_pi_tuple);
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struct scsi_disk *sdkp;
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struct bio *bio;
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struct t10_pi_tuple *pi;
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unsigned int j, intervals;
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u32 phys, virt;
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sdkp = scsi_disk(scmd->request->rq_disk);
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if (sdkp->protection_type == T10_PI_TYPE3_PROTECTION || good_bytes == 0)
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return;
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intervals = good_bytes / scsi_prot_interval(scmd);
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phys = scsi_prot_ref_tag(scmd);
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__rq_for_each_bio(bio, scmd->request) {
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struct bio_integrity_payload *bip = bio_integrity(bio);
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struct bio_vec iv;
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struct bvec_iter iter;
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virt = bip_get_seed(bip) & 0xffffffff;
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bip_for_each_vec(iv, bip, iter) {
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pi = kmap_atomic(iv.bv_page) + iv.bv_offset;
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for (j = 0; j < iv.bv_len; j += tuple_sz, pi++) {
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if (intervals == 0) {
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kunmap_atomic(pi);
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return;
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}
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if (be32_to_cpu(pi->ref_tag) == phys)
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pi->ref_tag = cpu_to_be32(virt);
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virt++;
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phys++;
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intervals--;
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}
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kunmap_atomic(pi);
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}
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}
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}
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