1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * sd_dif.c - SCSI Data Integrity Field
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2007, 2008 Oracle Corporation
6*4882a593Smuzhiyun * Written by: Martin K. Petersen <martin.petersen@oracle.com>
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/blkdev.h>
10*4882a593Smuzhiyun #include <linux/t10-pi.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <scsi/scsi.h>
13*4882a593Smuzhiyun #include <scsi/scsi_cmnd.h>
14*4882a593Smuzhiyun #include <scsi/scsi_dbg.h>
15*4882a593Smuzhiyun #include <scsi/scsi_device.h>
16*4882a593Smuzhiyun #include <scsi/scsi_driver.h>
17*4882a593Smuzhiyun #include <scsi/scsi_eh.h>
18*4882a593Smuzhiyun #include <scsi/scsi_host.h>
19*4882a593Smuzhiyun #include <scsi/scsi_ioctl.h>
20*4882a593Smuzhiyun #include <scsi/scsicam.h>
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun #include "sd.h"
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun /*
25*4882a593Smuzhiyun * Configure exchange of protection information between OS and HBA.
26*4882a593Smuzhiyun */
sd_dif_config_host(struct scsi_disk * sdkp)27*4882a593Smuzhiyun void sd_dif_config_host(struct scsi_disk *sdkp)
28*4882a593Smuzhiyun {
29*4882a593Smuzhiyun struct scsi_device *sdp = sdkp->device;
30*4882a593Smuzhiyun struct gendisk *disk = sdkp->disk;
31*4882a593Smuzhiyun u8 type = sdkp->protection_type;
32*4882a593Smuzhiyun struct blk_integrity bi;
33*4882a593Smuzhiyun int dif, dix;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun dif = scsi_host_dif_capable(sdp->host, type);
36*4882a593Smuzhiyun dix = scsi_host_dix_capable(sdp->host, type);
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun if (!dix && scsi_host_dix_capable(sdp->host, 0)) {
39*4882a593Smuzhiyun dif = 0; dix = 1;
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun if (!dix)
43*4882a593Smuzhiyun return;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun memset(&bi, 0, sizeof(bi));
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun /* Enable DMA of protection information */
48*4882a593Smuzhiyun if (scsi_host_get_guard(sdkp->device->host) & SHOST_DIX_GUARD_IP) {
49*4882a593Smuzhiyun if (type == T10_PI_TYPE3_PROTECTION)
50*4882a593Smuzhiyun bi.profile = &t10_pi_type3_ip;
51*4882a593Smuzhiyun else
52*4882a593Smuzhiyun bi.profile = &t10_pi_type1_ip;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun bi.flags |= BLK_INTEGRITY_IP_CHECKSUM;
55*4882a593Smuzhiyun } else
56*4882a593Smuzhiyun if (type == T10_PI_TYPE3_PROTECTION)
57*4882a593Smuzhiyun bi.profile = &t10_pi_type3_crc;
58*4882a593Smuzhiyun else
59*4882a593Smuzhiyun bi.profile = &t10_pi_type1_crc;
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun bi.tuple_size = sizeof(struct t10_pi_tuple);
62*4882a593Smuzhiyun sd_printk(KERN_NOTICE, sdkp,
63*4882a593Smuzhiyun "Enabling DIX %s protection\n", bi.profile->name);
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun if (dif && type) {
66*4882a593Smuzhiyun bi.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun if (!sdkp->ATO)
69*4882a593Smuzhiyun goto out;
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun if (type == T10_PI_TYPE3_PROTECTION)
72*4882a593Smuzhiyun bi.tag_size = sizeof(u16) + sizeof(u32);
73*4882a593Smuzhiyun else
74*4882a593Smuzhiyun bi.tag_size = sizeof(u16);
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun sd_printk(KERN_NOTICE, sdkp, "DIF application tag size %u\n",
77*4882a593Smuzhiyun bi.tag_size);
78*4882a593Smuzhiyun }
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun out:
81*4882a593Smuzhiyun blk_integrity_register(disk, &bi);
82*4882a593Smuzhiyun }
83*4882a593Smuzhiyun
84