cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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sd_dif.c (1856B)

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