| 1 | |
| 2 | |
| 3 | * sd_dif.c - SCSI Data Integrity Field
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| 4 | *
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| 5 | * Copyright (C) 2007, 2008 Oracle Corporation
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| 6 | * Written by: Martin K. Petersen <[email protected]>
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| 7 |
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| 8 |
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| 9 | #include <linux/blk-integrity.h>
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| 10 | #include <linux/t10-pi.h>
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| 11 |
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| 12 | #include <scsi/scsi.h>
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| 13 | #include <scsi/scsi_cmnd.h>
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| 14 | #include <scsi/scsi_dbg.h>
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| 15 | #include <scsi/scsi_device.h>
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| 16 | #include <scsi/scsi_driver.h>
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| 17 | #include <scsi/scsi_eh.h>
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| 18 | #include <scsi/scsi_host.h>
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| 19 | #include <scsi/scsi_ioctl.h>
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| 20 | #include <scsi/scsicam.h>
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| 21 |
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| 22 | #include "sd.h"
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| 23 |
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| 24 | |
| 25 | * Configure exchange of protection information between OS and HBA.
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| 26 |
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| 27 | void sd_dif_config_host(struct scsi_disk *sdkp, struct queue_limits *lim)
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| 28 | {
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| 29 | struct scsi_device *sdp = sdkp->device;
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| 30 | u8 type = sdkp->protection_type;
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| 31 | struct blk_integrity *bi = &lim->integrity;
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| 32 | int dif, dix;
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| 33 |
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| 34 | memset(bi, 0, sizeof(*bi));
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| 35 |
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| 36 | dif = scsi_host_dif_capable(sdp->host, type);
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| 37 | dix = scsi_host_dix_capable(sdp->host, type);
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| 38 |
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| 39 | if (!dix && scsi_host_dix_capable(sdp->host, 0)) {
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| 40 | dif = 0; dix = 1;
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| 41 | }
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| 42 |
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| 43 | if (!dix)
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| 44 | return;
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| 45 |
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| 46 |
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| 47 | if (scsi_host_get_guard(sdkp->device->host) & SHOST_DIX_GUARD_IP)
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| 48 | bi->csum_type = BLK_INTEGRITY_CSUM_IP;
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| 49 | else
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| 50 | bi->csum_type = BLK_INTEGRITY_CSUM_CRC;
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| 51 |
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| 52 | if (type != T10_PI_TYPE3_PROTECTION)
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| 53 | bi->flags |= BLK_INTEGRITY_REF_TAG;
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| 54 |
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| 55 | bi->metadata_size = sizeof(struct t10_pi_tuple);
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| 56 | bi->pi_tuple_size = bi->metadata_size;
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| 57 |
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| 58 | if (dif && type) {
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| 59 | bi->flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
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| 60 |
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| 61 | if (!sdkp->ATO)
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| 62 | return;
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| 63 |
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| 64 | if (type == T10_PI_TYPE3_PROTECTION)
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| 65 | bi->tag_size = sizeof(u16) + sizeof(u32);
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| 66 | else
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| 67 | bi->tag_size = sizeof(u16);
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| 68 | }
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| 69 |
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| 70 | sd_first_printk(KERN_NOTICE, sdkp,
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| 71 | "Enabling DIX %s, application tag size %u bytes\n",
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| 72 | blk_integrity_profile_name(bi), bi->tag_size);
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| 73 | }
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