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sd: add support for TCG OPAL self encrypting disks

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Just wire up the generic TCG OPAL infrastructure to the SCSI disk driver
and the Security In/Out commands.

Note that I don't know of any actual SCSI disks that do support TCG OPAL,
but this is required to support ATA disks through libata.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Christoph Hellwig
2017-06-19 14:26:46 +02:00
committed by Tejun Heo
parent c8ccf812c3
commit d80210f25f
4 changed files with 58 additions and 1 deletions
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53
drivers/scsi/sd.c
View File

@@ -50,6 +50,7 @@
#include <linux/string_helpers.h>
#include <linux/async.h>
#include <linux/slab.h>
#include <linux/sed-opal.h>
#include <linux/pm_runtime.h>
#include <linux/pr.h>
#include <linux/t10-pi.h>
@@ -643,6 +644,26 @@ static void scsi_disk_put(struct scsi_disk *sdkp)
mutex_unlock(&sd_ref_mutex);
}
#ifdef CONFIG_BLK_SED_OPAL
static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
size_t len, bool send)
{
struct scsi_device *sdev = data;
u8 cdb[12] = { 0, };
int ret;
cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
cdb[1] = secp;
put_unaligned_be16(spsp, &cdb[2]);
put_unaligned_be32(len, &cdb[6]);
ret = scsi_execute_req(sdev, cdb,
send ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
buffer, len, NULL, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
return ret <= 0 ? ret : -EIO;
}
#endif /* CONFIG_BLK_SED_OPAL */
static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
unsigned int dix, unsigned int dif)
{
@@ -1439,6 +1460,9 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode,
if (error)
goto out;
if (is_sed_ioctl(cmd))
return sed_ioctl(sdkp->opal_dev, cmd, p);
/*
* Send SCSI addressing ioctls directly to mid level, send other
* ioctls to block level and then onto mid level if they can't be
@@ -2994,6 +3018,20 @@ static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
sdkp->ws10 = 1;
}
static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
{
struct scsi_device *sdev = sdkp->device;
if (!sdev->security_supported)
return;
if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
SECURITY_PROTOCOL_IN) == 1 &&
scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
SECURITY_PROTOCOL_OUT) == 1)
sdkp->security = 1;
}
/**
* sd_revalidate_disk - called the first time a new disk is seen,
* performs disk spin up, read_capacity, etc.
@@ -3047,6 +3085,7 @@ static int sd_revalidate_disk(struct gendisk *disk)
sd_read_cache_type(sdkp, buffer);
sd_read_app_tag_own(sdkp, buffer);
sd_read_write_same(sdkp, buffer);
sd_read_security(sdkp, buffer);
}
sdkp->first_scan = 0;
@@ -3207,6 +3246,12 @@ static void sd_probe_async(void *data, async_cookie_t cookie)
sd_revalidate_disk(gd);
if (sdkp->security) {
sdkp->opal_dev = init_opal_dev(sdp, &sd_sec_submit);
if (sdkp->opal_dev)
sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
}
sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
sdp->removable ? "removable " : "");
scsi_autopm_put_device(sdp);
@@ -3356,6 +3401,8 @@ static int sd_remove(struct device *dev)
sd_zbc_remove(sdkp);
free_opal_dev(sdkp->opal_dev);
blk_register_region(devt, SD_MINORS, NULL,
sd_default_probe, NULL, NULL);
@@ -3497,6 +3544,7 @@ static int sd_suspend_runtime(struct device *dev)
static int sd_resume(struct device *dev)
{
struct scsi_disk *sdkp = dev_get_drvdata(dev);
int ret;
if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
return 0;
@@ -3505,7 +3553,10 @@ static int sd_resume(struct device *dev)
return 0;
sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
return sd_start_stop_device(sdkp, 1);
ret = sd_start_stop_device(sdkp, 1);
if (!ret)
opal_unlock_from_suspend(sdkp->opal_dev);
return ret;
}
/**