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[S390] Add crypto support for 3592 tape devices 

3592 tape devices are able to write data encrpyted on tape mediums.
This z/Linux device driver support includes the following functions:
 * ioctl to switch on/off encryption
 * ioctl to query encryption status of drive
 * ioctls to set and query key encrypting keys (kekls)
 * long busy interrupt handling

Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Holzheu 2007-02-05 21:18:26 +01:00 committed by Martin Schwidefsky
parent fe355b7f1c
commit cced1dd42e
6 changed files with 645 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/s390/char/tape.h
View File

@ -3,7 +3,7 @@
* tape device driver for 3480/3490E/3590 tapes.
*
* S390 and zSeries version
* Copyright (C) 2001,2005 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Copyright IBM Corp. 2001,2006
* Author(s): Carsten Otte <cotte@de.ibm.com>
* Tuan Ngo-Anh <ngoanh@de.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
@ -99,7 +99,11 @@ enum tape_op {
TO_DIS, /* Tape display */
TO_ASSIGN, /* Assign tape to channel path */
TO_UNASSIGN, /* Unassign tape from channel path */
TO_SIZE /* #entries in tape_op_t */
TO_CRYPT_ON, /* Enable encrpytion */
TO_CRYPT_OFF, /* Disable encrpytion */
TO_KEKL_SET, /* Set KEK label */
TO_KEKL_QUERY, /* Query KEK label */
TO_SIZE, /* #entries in tape_op_t */
};
/* Forward declaration */
@ -112,6 +116,7 @@ enum tape_request_status {
TAPE_REQUEST_IN_IO, /* request is currently in IO */
TAPE_REQUEST_DONE, /* request is completed. */
TAPE_REQUEST_CANCEL, /* request should be canceled. */
TAPE_REQUEST_LONG_BUSY, /* request has to be restarted after long busy */
};
/* Tape CCW request */
@ -164,10 +169,11 @@ struct tape_discipline {
* The discipline irq function either returns an error code (<0) which
* means that the request has failed with an error or one of the following:
*/
#define TAPE_IO_SUCCESS 0 /* request successful */
#define TAPE_IO_PENDING 1 /* request still running */
#define TAPE_IO_RETRY 2 /* retry to current request */
#define TAPE_IO_STOP 3 /* stop the running request */
#define TAPE_IO_SUCCESS 0 /* request successful */
#define TAPE_IO_PENDING 1 /* request still running */
#define TAPE_IO_RETRY 2 /* retry to current request */
#define TAPE_IO_STOP 3 /* stop the running request */
#define TAPE_IO_LONG_BUSY 4 /* delay the running request */
/* Char Frontend Data */
struct tape_char_data {
@ -242,6 +248,10 @@ struct tape_device {
/* Function to start or stop the next request later. */
struct delayed_work tape_dnr;
/* Timer for long busy */
struct timer_list lb_timeout;
};
/* Externals from tape_core.c */

479
drivers/s390/char/tape_3590.c
View File

@ -2,7 +2,7 @@
* drivers/s390/char/tape_3590.c
* tape device discipline for 3590 tapes.
*
* Copyright (C) IBM Corp. 2001,2006
* Copyright IBM Corp. 2001,2006
* Author(s): Stefan Bader <shbader@de.ibm.com>
* Michael Holzheu <holzheu@de.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
@ -11,6 +11,7 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/bio.h>
#include <asm/ebcdic.h>
#define TAPE_DBF_AREA tape_3590_dbf
@ -30,7 +31,7 @@ EXPORT_SYMBOL(TAPE_DBF_AREA);
* - Read Device (buffered) log: BRA
* - Read Library log: BRA
* - Swap Devices: BRA
* - Long Busy: BRA
* - Long Busy: implemented
* - Special Intercept: BRA
* - Read Alternate: implemented
*******************************************************************/
@ -94,6 +95,332 @@ static const char *tape_3590_msg[TAPE_3590_MAX_MSG] = {
[0xae] = "Subsystem environmental alert",
};
static int crypt_supported(struct tape_device *device)
{
return TAPE390_CRYPT_SUPPORTED(TAPE_3590_CRYPT_INFO(device));
}
static int crypt_enabled(struct tape_device *device)
{
return TAPE390_CRYPT_ON(TAPE_3590_CRYPT_INFO(device));
}
static void ext_to_int_kekl(struct tape390_kekl *in,
struct tape3592_kekl *out)
{
int i;
memset(out, 0, sizeof(*out));
if (in->type == TAPE390_KEKL_TYPE_HASH)
out->flags |= 0x40;
if (in->type_on_tape == TAPE390_KEKL_TYPE_HASH)
out->flags |= 0x80;
strncpy(out->label, in->label, 64);
for (i = strlen(in->label); i < sizeof(out->label); i++)
out->label[i] = ' ';
ASCEBC(out->label, sizeof(out->label));
}
static void int_to_ext_kekl(struct tape3592_kekl *in,
struct tape390_kekl *out)
{
memset(out, 0, sizeof(*out));
if(in->flags & 0x40)
out->type = TAPE390_KEKL_TYPE_HASH;
else
out->type = TAPE390_KEKL_TYPE_LABEL;
if(in->flags & 0x80)
out->type_on_tape = TAPE390_KEKL_TYPE_HASH;
else
out->type_on_tape = TAPE390_KEKL_TYPE_LABEL;
memcpy(out->label, in->label, sizeof(in->label));
EBCASC(out->label, sizeof(in->label));
strstrip(out->label);
}
static void int_to_ext_kekl_pair(struct tape3592_kekl_pair *in,
struct tape390_kekl_pair *out)
{
if (in->count == 0) {
out->kekl[0].type = TAPE390_KEKL_TYPE_NONE;
out->kekl[0].type_on_tape = TAPE390_KEKL_TYPE_NONE;
out->kekl[1].type = TAPE390_KEKL_TYPE_NONE;
out->kekl[1].type_on_tape = TAPE390_KEKL_TYPE_NONE;
} else if (in->count == 1) {
int_to_ext_kekl(&in->kekl[0], &out->kekl[0]);
out->kekl[1].type = TAPE390_KEKL_TYPE_NONE;
out->kekl[1].type_on_tape = TAPE390_KEKL_TYPE_NONE;
} else if (in->count == 2) {
int_to_ext_kekl(&in->kekl[0], &out->kekl[0]);
int_to_ext_kekl(&in->kekl[1], &out->kekl[1]);
} else {
printk("Invalid KEKL number: %d\n", in->count);
BUG();
}
}
static int check_ext_kekl(struct tape390_kekl *kekl)
{
if (kekl->type == TAPE390_KEKL_TYPE_NONE)
goto invalid;
if (kekl->type > TAPE390_KEKL_TYPE_HASH)
goto invalid;
if (kekl->type_on_tape == TAPE390_KEKL_TYPE_NONE)
goto invalid;
if (kekl->type_on_tape > TAPE390_KEKL_TYPE_HASH)
goto invalid;
if ((kekl->type == TAPE390_KEKL_TYPE_HASH) &&
(kekl->type_on_tape == TAPE390_KEKL_TYPE_LABEL))
goto invalid;
return 0;
invalid:
return -EINVAL;
}
static int check_ext_kekl_pair(struct tape390_kekl_pair *kekls)
{
if (check_ext_kekl(&kekls->kekl[0]))
goto invalid;
if (check_ext_kekl(&kekls->kekl[1]))
goto invalid;
return 0;
invalid:
return -EINVAL;
}
/*
* Query KEKLs
*/
static int tape_3592_kekl_query(struct tape_device *device,
struct tape390_kekl_pair *ext_kekls)
{
struct tape_request *request;
struct tape3592_kekl_query_order *order;
struct tape3592_kekl_query_data *int_kekls;
int rc;
DBF_EVENT(6, "tape3592_kekl_query\n");
int_kekls = kmalloc(sizeof(*int_kekls), GFP_KERNEL|GFP_DMA);
if (!int_kekls)
return -ENOMEM;
request = tape_alloc_request(2, sizeof(*order));
if (IS_ERR(request)) {
rc = PTR_ERR(request);
goto fail_malloc;
}
order = request->cpdata;
memset(order,0,sizeof(*order));
order->code = 0xe2;
order->max_count = 2;
request->op = TO_KEKL_QUERY;
tape_ccw_cc(request->cpaddr, PERF_SUBSYS_FUNC, sizeof(*order), order);
tape_ccw_end(request->cpaddr + 1, READ_SS_DATA, sizeof(*int_kekls),
int_kekls);
rc = tape_do_io(device, request);
if (rc)
goto fail_request;
int_to_ext_kekl_pair(&int_kekls->kekls, ext_kekls);
rc = 0;
fail_request:
tape_free_request(request);
fail_malloc:
kfree(int_kekls);
return rc;
}
/*
* IOCTL: Query KEKLs
*/
static int tape_3592_ioctl_kekl_query(struct tape_device *device,
unsigned long arg)
{
int rc;
struct tape390_kekl_pair *ext_kekls;
DBF_EVENT(6, "tape_3592_ioctl_kekl_query\n");
if (!crypt_supported(device))
return -ENOSYS;
if (!crypt_enabled(device))
return -EUNATCH;
ext_kekls = kmalloc(sizeof(*ext_kekls), GFP_KERNEL);
if (!ext_kekls)
return -ENOMEM;
rc = tape_3592_kekl_query(device, ext_kekls);
if (rc != 0)
goto fail;
if (copy_to_user((char __user *) arg, ext_kekls, sizeof(*ext_kekls))) {
rc = -EFAULT;
goto fail;
}
rc = 0;
fail:
kfree(ext_kekls);
return rc;
}
static int tape_3590_mttell(struct tape_device *device, int mt_count);
/*
* Set KEKLs
*/
static int tape_3592_kekl_set(struct tape_device *device,
struct tape390_kekl_pair *ext_kekls)
{
struct tape_request *request;
struct tape3592_kekl_set_order *order;
DBF_EVENT(6, "tape3592_kekl_set\n");
if (check_ext_kekl_pair(ext_kekls)) {
DBF_EVENT(6, "invalid kekls\n");
return -EINVAL;
}
if (tape_3590_mttell(device, 0) != 0)
return -EBADSLT;
request = tape_alloc_request(1, sizeof(*order));
if (IS_ERR(request))
return PTR_ERR(request);
order = request->cpdata;
memset(order, 0, sizeof(*order));
order->code = 0xe3;
order->kekls.count = 2;
ext_to_int_kekl(&ext_kekls->kekl[0], &order->kekls.kekl[0]);
ext_to_int_kekl(&ext_kekls->kekl[1], &order->kekls.kekl[1]);
request->op = TO_KEKL_SET;
tape_ccw_end(request->cpaddr, PERF_SUBSYS_FUNC, sizeof(*order), order);
return tape_do_io_free(device, request);
}
/*
* IOCTL: Set KEKLs
*/
static int tape_3592_ioctl_kekl_set(struct tape_device *device,
unsigned long arg)
{
int rc;
struct tape390_kekl_pair *ext_kekls;
DBF_EVENT(6, "tape_3592_ioctl_kekl_set\n");
if (!crypt_supported(device))
return -ENOSYS;
if (!crypt_enabled(device))
return -EUNATCH;
ext_kekls = kmalloc(sizeof(*ext_kekls), GFP_KERNEL);
if (!ext_kekls)
return -ENOMEM;
if (copy_from_user(ext_kekls, (char __user *)arg, sizeof(*ext_kekls))) {
rc = -EFAULT;
goto out;
}
rc = tape_3592_kekl_set(device, ext_kekls);
out:
kfree(ext_kekls);
return rc;
}
/*
* Enable encryption
*/
static int tape_3592_enable_crypt(struct tape_device *device)
{
struct tape_request *request;
char *data;
DBF_EVENT(6, "tape_3592_enable_crypt\n");
if (!crypt_supported(device))
return -ENOSYS;
request = tape_alloc_request(2, 72);
if (IS_ERR(request))
return PTR_ERR(request);
data = request->cpdata;
memset(data,0,72);
data[0] = 0x05;
data[36 + 0] = 0x03;
data[36 + 1] = 0x03;
data[36 + 4] = 0x40;
data[36 + 6] = 0x01;
data[36 + 14] = 0x2f;
data[36 + 18] = 0xc3;
data[36 + 35] = 0x72;
request->op = TO_CRYPT_ON;
tape_ccw_cc(request->cpaddr, MODE_SET_CB, 36, data);
tape_ccw_end(request->cpaddr + 1, MODE_SET_CB, 36, data + 36);
return tape_do_io_free(device, request);
}
/*
* Disable encryption
*/
static int tape_3592_disable_crypt(struct tape_device *device)
{
struct tape_request *request;
char *data;
DBF_EVENT(6, "tape_3592_disable_crypt\n");
if (!crypt_supported(device))
return -ENOSYS;
request = tape_alloc_request(2, 72);
if (IS_ERR(request))
return PTR_ERR(request);
data = request->cpdata;
memset(data,0,72);
data[0] = 0x05;
data[36 + 0] = 0x03;
data[36 + 1] = 0x03;
data[36 + 35] = 0x32;
request->op = TO_CRYPT_OFF;
tape_ccw_cc(request->cpaddr, MODE_SET_CB, 36, data);
tape_ccw_end(request->cpaddr + 1, MODE_SET_CB, 36, data + 36);
return tape_do_io_free(device, request);
}
/*
* IOCTL: Set encryption status
*/
static int tape_3592_ioctl_crypt_set(struct tape_device *device,
unsigned long arg)
{
struct tape390_crypt_info info;
DBF_EVENT(6, "tape_3592_ioctl_crypt_set\n");
if (!crypt_supported(device))
return -ENOSYS;
if (copy_from_user(&info, (char __user *)arg, sizeof(info)))
return -EFAULT;
if (info.status & ~TAPE390_CRYPT_ON_MASK)
return -EINVAL;
if (info.status & TAPE390_CRYPT_ON_MASK)
return tape_3592_enable_crypt(device);
else
return tape_3592_disable_crypt(device);
}
static int tape_3590_sense_medium(struct tape_device *device);
/*
* IOCTL: Query enryption status
*/
static int tape_3592_ioctl_crypt_query(struct tape_device *device,
unsigned long arg)
{
DBF_EVENT(6, "tape_3592_ioctl_crypt_query\n");
if (!crypt_supported(device))
return -ENOSYS;
tape_3590_sense_medium(device);
if (copy_to_user((char __user *) arg, &TAPE_3590_CRYPT_INFO(device),
sizeof(TAPE_3590_CRYPT_INFO(device))))
return -EFAULT;
else
return 0;
}
/*
* 3590 IOCTL Overload
*/
@ -109,6 +436,14 @@ tape_3590_ioctl(struct tape_device *device, unsigned int cmd, unsigned long arg)
return tape_std_display(device, &disp);
}
case TAPE390_KEKL_SET:
return tape_3592_ioctl_kekl_set(device, arg);
case TAPE390_KEKL_QUERY:
return tape_3592_ioctl_kekl_query(device, arg);
case TAPE390_CRYPT_SET:
return tape_3592_ioctl_crypt_set(device, arg);
case TAPE390_CRYPT_QUERY:
return tape_3592_ioctl_crypt_query(device, arg);
default:
return -EINVAL; /* no additional ioctls */
}
@ -248,6 +583,12 @@ tape_3590_work_handler(struct work_struct *work)
case TO_READ_ATTMSG:
tape_3590_read_attmsg(p->device);
break;
case TO_CRYPT_ON:
tape_3592_enable_crypt(p->device);
break;
case TO_CRYPT_OFF:
tape_3592_disable_crypt(p->device);
break;
default:
DBF_EVENT(3, "T3590: work handler undefined for "
"operation 0x%02x\n", p->op);
@ -365,6 +706,33 @@ tape_3590_check_locate(struct tape_device *device, struct tape_request *request)
}
#endif
static void tape_3590_med_state_set(struct tape_device *device,
struct tape_3590_med_sense *sense)
{
struct tape390_crypt_info *c_info;
c_info = &TAPE_3590_CRYPT_INFO(device);
if (sense->masst == MSENSE_UNASSOCIATED) {
tape_med_state_set(device, MS_UNLOADED);
TAPE_3590_CRYPT_INFO(device).medium_status = 0;
return;
}
if (sense->masst != MSENSE_ASSOCIATED_MOUNT) {
PRINT_ERR("Unknown medium state: %x\n", sense->masst);
return;
}
tape_med_state_set(device, MS_LOADED);
c_info->medium_status |= TAPE390_MEDIUM_LOADED_MASK;
if (sense->flags & MSENSE_CRYPT_MASK) {
PRINT_INFO("Medium is encrypted (%04x)\n", sense->flags);
c_info->medium_status |= TAPE390_MEDIUM_ENCRYPTED_MASK;
} else {
DBF_EVENT(6, "Medium is not encrypted %04x\n", sense->flags);
c_info->medium_status &= ~TAPE390_MEDIUM_ENCRYPTED_MASK;
}
}
/*
* The done handler is called at device/channel end and wakes up the sleeping
* process
@ -372,9 +740,10 @@ tape_3590_check_locate(struct tape_device *device, struct tape_request *request)
static int
tape_3590_done(struct tape_device *device, struct tape_request *request)
{
struct tape_3590_med_sense *sense;
struct tape_3590_disc_data *disc_data;
DBF_EVENT(6, "%s done\n", tape_op_verbose[request->op]);
disc_data = device->discdata;
switch (request->op) {
case TO_BSB:
@ -394,13 +763,20 @@ tape_3590_done(struct tape_device *device, struct tape_request *request)
break;
case TO_RUN:
tape_med_state_set(device, MS_UNLOADED);
tape_3590_schedule_work(device, TO_CRYPT_OFF);
break;
case TO_MSEN:
sense = (struct tape_3590_med_sense *) request->cpdata;
if (sense->masst == MSENSE_UNASSOCIATED)
tape_med_state_set(device, MS_UNLOADED);
if (sense->masst == MSENSE_ASSOCIATED_MOUNT)
tape_med_state_set(device, MS_LOADED);
tape_3590_med_state_set(device, request->cpdata);
break;
case TO_CRYPT_ON:
TAPE_3590_CRYPT_INFO(device).status
|= TAPE390_CRYPT_ON_MASK;
*(device->modeset_byte) |= 0x03;
break;
case TO_CRYPT_OFF:
TAPE_3590_CRYPT_INFO(device).status
&= ~TAPE390_CRYPT_ON_MASK;
*(device->modeset_byte) &= ~0x03;
break;
case TO_RBI: /* RBI seems to succeed even without medium loaded. */
case TO_NOP: /* Same to NOP. */
@ -409,8 +785,9 @@ tape_3590_done(struct tape_device *device, struct tape_request *request)
case TO_DIS:
case TO_ASSIGN:
case TO_UNASSIGN:
break;
case TO_SIZE:
case TO_KEKL_SET:
case TO_KEKL_QUERY:
break;
}
return TAPE_IO_SUCCESS;
@ -540,10 +917,8 @@ static int
tape_3590_erp_long_busy(struct tape_device *device,
struct tape_request *request, struct irb *irb)
{
/* FIXME: how about WAITING for a minute ? */
PRINT_WARN("(%s): Device is busy! Please wait a minute!\n",
device->cdev->dev.bus_id);
return tape_3590_erp_basic(device, request, irb, -EBUSY);
DBF_EVENT(6, "Device is busy\n");
return TAPE_IO_LONG_BUSY;
}
/*
@ -951,6 +1326,34 @@ tape_3590_print_era_msg(struct tape_device *device, struct irb *irb)
device->cdev->dev.bus_id, sense->mc);
}
static int tape_3590_crypt_error(struct tape_device *device,
struct tape_request *request, struct irb *irb)
{
u8 cu_rc, ekm_rc1;
u16 ekm_rc2;
u32 drv_rc;
char *bus_id, *sense;
sense = ((struct tape_3590_sense *) irb->ecw)->fmt.data;
bus_id = device->cdev->dev.bus_id;
cu_rc = sense[0];
drv_rc = *((u32*) &sense[5]) & 0xffffff;
ekm_rc1 = sense[9];
ekm_rc2 = *((u16*) &sense[10]);
if ((cu_rc == 0) && (ekm_rc2 == 0xee31))
/* key not defined on EKM */
return tape_3590_erp_basic(device, request, irb, -EKEYREJECTED);
if ((cu_rc == 1) || (cu_rc == 2))
/* No connection to EKM */
return tape_3590_erp_basic(device, request, irb, -ENOTCONN);
PRINT_ERR("(%s): Unable to get encryption key from EKM\n", bus_id);
PRINT_ERR("(%s): CU=%02X DRIVE=%06X EKM=%02X:%04X\n", bus_id, cu_rc,
drv_rc, ekm_rc1, ekm_rc2);
return tape_3590_erp_basic(device, request, irb, -ENOKEY);
}
/*
* 3590 error Recovery routine:
* If possible, it tries to recover from the error. If this is not possible,
@ -979,6 +1382,8 @@ tape_3590_unit_check(struct tape_device *device, struct tape_request *request,
sense = (struct tape_3590_sense *) irb->ecw;
DBF_EVENT(6, "Unit Check: RQC = %x\n", sense->rc_rqc);
/*
* First check all RC-QRCs where we want to do something special
* - "break": basic error recovery is done
@ -999,6 +1404,8 @@ tape_3590_unit_check(struct tape_device *device, struct tape_request *request,
case 0x2231:
tape_3590_print_era_msg(device, irb);
return tape_3590_erp_special_interrupt(device, request, irb);
case 0x2240:
return tape_3590_crypt_error(device, request, irb);
case 0x3010:
DBF_EVENT(2, "(%08x): Backward at Beginning of Partition\n",
@ -1020,6 +1427,7 @@ tape_3590_unit_check(struct tape_device *device, struct tape_request *request,
DBF_EVENT(2, "(%08x): Rewind Unload complete\n",
device->cdev_id);
tape_med_state_set(device, MS_UNLOADED);
tape_3590_schedule_work(device, TO_CRYPT_OFF);
return tape_3590_erp_basic(device, request, irb, 0);
case 0x4010:
@ -1030,9 +1438,15 @@ tape_3590_unit_check(struct tape_device *device, struct tape_request *request,
PRINT_WARN("(%s): Tape operation when medium not loaded\n",
device->cdev->dev.bus_id);
tape_med_state_set(device, MS_UNLOADED);
tape_3590_schedule_work(device, TO_CRYPT_OFF);
return tape_3590_erp_basic(device, request, irb, -ENOMEDIUM);
case 0x4012: /* Device Long Busy */
/* XXX: Also use long busy handling here? */
DBF_EVENT(6, "(%08x): LONG BUSY\n", device->cdev_id);
tape_3590_print_era_msg(device, irb);
return tape_3590_erp_basic(device, request, irb, -EBUSY);
case 0x4014:
DBF_EVENT(6, "(%08x): Crypto LONG BUSY\n", device->cdev_id);
return tape_3590_erp_long_busy(device, request, irb);
case 0x5010:
@ -1064,6 +1478,7 @@ tape_3590_unit_check(struct tape_device *device, struct tape_request *request,
case 0x5120:
case 0x1120:
tape_med_state_set(device, MS_UNLOADED);
tape_3590_schedule_work(device, TO_CRYPT_OFF);
return tape_3590_erp_basic(device, request, irb, -ENOMEDIUM);
case 0x6020:
@ -1142,21 +1557,47 @@ tape_3590_setup_device(struct tape_device *device)
{
int rc;
struct tape_3590_disc_data *data;
char *rdc_data;
DBF_EVENT(6, "3590 device setup\n");
data = kmalloc(sizeof(struct tape_3590_disc_data),
GFP_KERNEL | GFP_DMA);
data = kzalloc(sizeof(struct tape_3590_disc_data), GFP_KERNEL | GFP_DMA);
if (data == NULL)
return -ENOMEM;
data->read_back_op = READ_PREVIOUS;
device->discdata = data;
if ((rc = tape_std_assign(device)) == 0) {
/* Try to find out if medium is loaded */
if ((rc = tape_3590_sense_medium(device)) != 0)
DBF_LH(3, "3590 medium sense returned %d\n", rc);
rdc_data = kmalloc(64, GFP_KERNEL | GFP_DMA);
if (!rdc_data) {
rc = -ENOMEM;
goto fail_kmalloc;
}
rc = read_dev_chars(device->cdev, (void**)&rdc_data, 64);
if (rc) {
DBF_LH(3, "Read device characteristics failed!\n");
goto fail_kmalloc;
}
rc = tape_std_assign(device);
if (rc)
goto fail_rdc_data;
if (rdc_data[31] == 0x13) {
PRINT_INFO("Device has crypto support\n");
data->crypt_info.capability |= TAPE390_CRYPT_SUPPORTED_MASK;
tape_3592_disable_crypt(device);
} else {
DBF_EVENT(6, "Device has NO crypto support\n");
}
/* Try to find out if medium is loaded */
rc = tape_3590_sense_medium(device);
if (rc) {
DBF_LH(3, "3590 medium sense returned %d\n", rc);
goto fail_rdc_data;
}
return 0;
fail_rdc_data:
kfree(rdc_data);
fail_kmalloc:
kfree(data);
return rc;
}

53
drivers/s390/char/tape_3590.h
View File

@ -2,7 +2,7 @@
* drivers/s390/char/tape_3590.h
* tape device discipline for 3590 tapes.
*
* Copyright (C) IBM Corp. 2001,2006
* Copyright IBM Corp. 2001,2006
* Author(s): Stefan Bader <shbader@de.ibm.com>
* Michael Holzheu <holzheu@de.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
@ -38,16 +38,22 @@
#define MSENSE_UNASSOCIATED 0x00
#define MSENSE_ASSOCIATED_MOUNT 0x01
#define MSENSE_ASSOCIATED_UMOUNT 0x02
#define MSENSE_CRYPT_MASK 0x00000010
#define TAPE_3590_MAX_MSG 0xb0
/* Datatypes */
struct tape_3590_disc_data {
unsigned char modeset_byte;
struct tape390_crypt_info crypt_info;
int read_back_op;
};
#define TAPE_3590_CRYPT_INFO(device) \
((struct tape_3590_disc_data*)(device->discdata))->crypt_info
#define TAPE_3590_READ_BACK_OP(device) \
((struct tape_3590_disc_data*)(device->discdata))->read_back_op
struct tape_3590_sense {
unsigned int command_rej:1;
@ -118,7 +124,48 @@ struct tape_3590_sense {
struct tape_3590_med_sense {
unsigned int macst:4;
unsigned int masst:4;
char pad[127];
char pad1[7];
unsigned int flags;
char pad2[116];
} __attribute__ ((packed));
/* Datastructures for 3592 encryption support */
struct tape3592_kekl {
__u8 flags;
char label[64];
} __attribute__ ((packed));
struct tape3592_kekl_pair {
__u8 count;
struct tape3592_kekl kekl[2];
} __attribute__ ((packed));
struct tape3592_kekl_query_data {
__u16 len;
__u8 fmt;
__u8 mc;
__u32 id;
__u8 flags;
struct tape3592_kekl_pair kekls;
char reserved[116];
} __attribute__ ((packed));
struct tape3592_kekl_query_order {
__u8 code;
__u8 flags;
char reserved1[2];
__u8 max_count;
char reserved2[35];
} __attribute__ ((packed));
struct tape3592_kekl_set_order {
__u8 code;
__u8 flags;
char reserved1[2];
__u8 op;
struct tape3592_kekl_pair kekls;
char reserved2[120];
} __attribute__ ((packed));
#endif /* _TAPE_3590_H */

2
drivers/s390/char/tape_char.c
View File

@ -3,7 +3,7 @@
* character device frontend for tape device driver
*
* S390 and zSeries version
* Copyright (C) 2001,2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Copyright IBM Corp. 2001,2006
* Author(s): Carsten Otte <cotte@de.ibm.com>
* Michael Holzheu <holzheu@de.ibm.com>
* Tuan Ngo-Anh <ngoanh@de.ibm.com>

53
drivers/s390/char/tape_core.c
View File

@ -3,7 +3,7 @@
* basic function of the tape device driver
*
* S390 and zSeries version
* Copyright (C) 2001,2005 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Copyright IBM Corp. 2001,2006
* Author(s): Carsten Otte <cotte@de.ibm.com>
* Michael Holzheu <holzheu@de.ibm.com>
* Tuan Ngo-Anh <ngoanh@de.ibm.com>
@ -26,9 +26,11 @@
#include "tape_std.h"
#define PRINTK_HEADER "TAPE_CORE: "
#define LONG_BUSY_TIMEOUT 180 /* seconds */
static void __tape_do_irq (struct ccw_device *, unsigned long, struct irb *);
static void tape_delayed_next_request(struct work_struct *);
static void tape_long_busy_timeout(unsigned long data);
/*
* One list to contain all tape devices of all disciplines, so
@ -69,7 +71,9 @@ const char *tape_op_verbose[TO_SIZE] =
[TO_LOAD] = "LOA", [TO_READ_CONFIG] = "RCF",
[TO_READ_ATTMSG] = "RAT",
[TO_DIS] = "DIS", [TO_ASSIGN] = "ASS",
[TO_UNASSIGN] = "UAS"
[TO_UNASSIGN] = "UAS", [TO_CRYPT_ON] = "CON",
[TO_CRYPT_OFF] = "COF", [TO_KEKL_SET] = "KLS",
[TO_KEKL_QUERY] = "KLQ",
};
static inline int
@ -346,6 +350,9 @@ tape_generic_online(struct tape_device *device,
return -EINVAL;
}
init_timer(&device->lb_timeout);
device->lb_timeout.function = tape_long_busy_timeout;
/* Let the discipline have a go at the device. */
device->discipline = discipline;
if (!try_module_get(discipline->owner)) {
@ -801,6 +808,22 @@ tape_delayed_next_request(struct work_struct *work)
spin_unlock_irq(get_ccwdev_lock(device->cdev));
}
static void tape_long_busy_timeout(unsigned long data)
{
struct tape_request *request;
struct tape_device *device;
device = (struct tape_device *) data;
spin_lock_irq(get_ccwdev_lock(device->cdev));
request = list_entry(device->req_queue.next, struct tape_request, list);
if (request->status != TAPE_REQUEST_LONG_BUSY)
BUG();
DBF_LH(6, "%08x: Long busy timeout.\n", device->cdev_id);
__tape_start_next_request(device);
device->lb_timeout.data = (unsigned long) tape_put_device(device);
spin_unlock_irq(get_ccwdev_lock(device->cdev));
}
static inline void
__tape_end_request(
struct tape_device * device,
@ -1094,7 +1117,22 @@ __tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
/* May be an unsolicited irq */
if(request != NULL)
request->rescnt = irb->scsw.count;
else if ((irb->scsw.dstat == 0x85 || irb->scsw.dstat == 0x80) &&
!list_empty(&device->req_queue)) {
/* Not Ready to Ready after long busy ? */
struct tape_request *req;
req = list_entry(device->req_queue.next,
struct tape_request, list);
if (req->status == TAPE_REQUEST_LONG_BUSY) {
DBF_EVENT(3, "(%08x): del timer\n", device->cdev_id);
if (del_timer(&device->lb_timeout)) {
device->lb_timeout.data = (unsigned long)
tape_put_device(device);
__tape_start_next_request(device);
}
return;
}
}
if (irb->scsw.dstat != 0x0c) {
/* Set the 'ONLINE' flag depending on sense byte 1 */
if(*(((__u8 *) irb->ecw) + 1) & SENSE_DRIVE_ONLINE)
@ -1142,6 +1180,15 @@ __tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
break;
case TAPE_IO_PENDING:
break;
case TAPE_IO_LONG_BUSY:
device->lb_timeout.data =
(unsigned long)tape_get_device_reference(device);
device->lb_timeout.expires = jiffies +
LONG_BUSY_TIMEOUT * HZ;
DBF_EVENT(3, "(%08x): add timer\n", device->cdev_id);
add_timer(&device->lb_timeout);
request->status = TAPE_REQUEST_LONG_BUSY;
break;
case TAPE_IO_RETRY:
rc = __tape_start_io(device, request);
if (rc)

72
include/asm-s390/tape390.h
View File

@ -1,11 +1,11 @@
/*************************************************************************
*
* tape390.h
* enables user programs to display messages on the tape device
* enables user programs to display messages and control encryption
* on s390 tape devices
*
* S390 and zSeries version
* Copyright (C) 2001 IBM Corporation
* Author(s): Despina Papadopoulou <despina_p@de.ibm.com>
* Copyright IBM Corp. 2001,2006
* Author(s): Michael Holzheu <holzheu@de.ibm.com>
*
*************************************************************************/
@ -36,4 +36,68 @@ typedef struct display_struct {
char message2[8];
} display_struct;
/*
* Tape encryption support
*/
struct tape390_crypt_info {
char capability;
char status;
char medium_status;
} __attribute__ ((packed));
/* Macros for "capable" field */
#define TAPE390_CRYPT_SUPPORTED_MASK 0x01
#define TAPE390_CRYPT_SUPPORTED(x) \
((x.capability & TAPE390_CRYPT_SUPPORTED_MASK))
/* Macros for "status" field */
#define TAPE390_CRYPT_ON_MASK 0x01
#define TAPE390_CRYPT_ON(x) (((x.status) & TAPE390_CRYPT_ON_MASK))
/* Macros for "medium status" field */
#define TAPE390_MEDIUM_LOADED_MASK 0x01
#define TAPE390_MEDIUM_ENCRYPTED_MASK 0x02
#define TAPE390_MEDIUM_ENCRYPTED(x) \
(((x.medium_status) & TAPE390_MEDIUM_ENCRYPTED_MASK))
#define TAPE390_MEDIUM_LOADED(x) \
(((x.medium_status) & TAPE390_MEDIUM_LOADED_MASK))
/*
* The TAPE390_CRYPT_SET ioctl is used to switch on/off encryption.
* The "encryption_capable" and "tape_status" fields are ignored for this ioctl!
*/
#define TAPE390_CRYPT_SET _IOW('d', 2, struct tape390_crypt_info)
/*
* The TAPE390_CRYPT_QUERY ioctl is used to query the encryption state.
*/
#define TAPE390_CRYPT_QUERY _IOR('d', 3, struct tape390_crypt_info)
/* Values for "kekl1/2_type" and "kekl1/2_type_on_tape" fields */
#define TAPE390_KEKL_TYPE_NONE 0
#define TAPE390_KEKL_TYPE_LABEL 1
#define TAPE390_KEKL_TYPE_HASH 2
struct tape390_kekl {
unsigned char type;
unsigned char type_on_tape;
char label[65];
} __attribute__ ((packed));
struct tape390_kekl_pair {
struct tape390_kekl kekl[2];
} __attribute__ ((packed));
/*
* The TAPE390_KEKL_SET ioctl is used to set Key Encrypting Key labels.
*/
#define TAPE390_KEKL_SET _IOW('d', 4, struct tape390_kekl_pair)
/*
* The TAPE390_KEKL_QUERY ioctl is used to query Key Encrypting Key labels.
*/
#define TAPE390_KEKL_QUERY _IOR('d', 5, struct tape390_kekl_pair)
#endif