| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | /* |
| 2 | * sd_dif.c - SCSI Data Integrity Field |
| 3 | * |
| 4 | * Copyright (C) 2007, 2008 Oracle Corporation |
| 5 | * Written by: Martin K. Petersen <martin.petersen@oracle.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License version |
| 9 | * 2 as published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, but |
| 12 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; see the file COPYING. If not, write to |
| 18 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, |
| 19 | * USA. |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <linux/blkdev.h> |
| 24 | #include <linux/t10-pi.h> |
| 25 | |
| 26 | #include <scsi/scsi.h> |
| 27 | #include <scsi/scsi_cmnd.h> |
| 28 | #include <scsi/scsi_dbg.h> |
| 29 | #include <scsi/scsi_device.h> |
| 30 | #include <scsi/scsi_driver.h> |
| 31 | #include <scsi/scsi_eh.h> |
| 32 | #include <scsi/scsi_host.h> |
| 33 | #include <scsi/scsi_ioctl.h> |
| 34 | #include <scsi/scsicam.h> |
| 35 | |
| 36 | #include "sd.h" |
| 37 | |
| 38 | /* |
| 39 | * Configure exchange of protection information between OS and HBA. |
| 40 | */ |
| 41 | void sd_dif_config_host(struct scsi_disk *sdkp) |
| 42 | { |
| 43 | struct scsi_device *sdp = sdkp->device; |
| 44 | struct gendisk *disk = sdkp->disk; |
| 45 | u8 type = sdkp->protection_type; |
| 46 | struct blk_integrity bi; |
| 47 | int dif, dix; |
| 48 | |
| 49 | dif = scsi_host_dif_capable(sdp->host, type); |
| 50 | dix = scsi_host_dix_capable(sdp->host, type); |
| 51 | |
| 52 | if (!dix && scsi_host_dix_capable(sdp->host, 0)) { |
| 53 | dif = 0; dix = 1; |
| 54 | } |
| 55 | |
| 56 | if (!dix) |
| 57 | return; |
| 58 | |
| 59 | memset(&bi, 0, sizeof(bi)); |
| 60 | |
| 61 | /* Enable DMA of protection information */ |
| 62 | if (scsi_host_get_guard(sdkp->device->host) & SHOST_DIX_GUARD_IP) { |
| 63 | if (type == T10_PI_TYPE3_PROTECTION) |
| 64 | bi.profile = &t10_pi_type3_ip; |
| 65 | else |
| 66 | bi.profile = &t10_pi_type1_ip; |
| 67 | |
| 68 | bi.flags |= BLK_INTEGRITY_IP_CHECKSUM; |
| 69 | } else |
| 70 | if (type == T10_PI_TYPE3_PROTECTION) |
| 71 | bi.profile = &t10_pi_type3_crc; |
| 72 | else |
| 73 | bi.profile = &t10_pi_type1_crc; |
| 74 | |
| 75 | bi.tuple_size = sizeof(struct t10_pi_tuple); |
| 76 | sd_printk(KERN_NOTICE, sdkp, |
| 77 | "Enabling DIX %s protection\n", bi.profile->name); |
| 78 | |
| 79 | if (dif && type) { |
| 80 | bi.flags |= BLK_INTEGRITY_DEVICE_CAPABLE; |
| 81 | |
| 82 | if (!sdkp->ATO) |
| 83 | goto out; |
| 84 | |
| 85 | if (type == T10_PI_TYPE3_PROTECTION) |
| 86 | bi.tag_size = sizeof(u16) + sizeof(u32); |
| 87 | else |
| 88 | bi.tag_size = sizeof(u16); |
| 89 | |
| 90 | sd_printk(KERN_NOTICE, sdkp, "DIF application tag size %u\n", |
| 91 | bi.tag_size); |
| 92 | } |
| 93 | |
| 94 | out: |
| 95 | blk_integrity_register(disk, &bi); |
| 96 | } |
| 97 | |