/*
* drivers/s390/char/tape_core.c
* basic function of the tape device driver
*
* S390 and zSeries version
* Copyright (C) 2001,2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Carsten Otte <cotte@de.ibm.com>
* Michael Holzheu <holzheu@de.ibm.com>
* Tuan Ngo-Anh <ngoanh@de.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h> // for kernel parameters
#include <linux/kmod.h> // for requesting modules
#include <linux/spinlock.h> // for locks
#include <linux/vmalloc.h>
#include <linux/list.h>
#include <asm/types.h> // for variable types
#include "tape.h"
#include "tape_std.h"
#define PRINTK_HEADER "T390:"
static void tape_do_irq (struct ccw_device *, unsigned long, struct irb *);
/*
* One list to contain all tape devices of all disciplines, so
* we can assign the devices to minor numbers of the same major
* The list is protected by the rwlock
*/
static struct list_head tape_device_list = LIST_HEAD_INIT(tape_device_list);
static rwlock_t tape_device_lock = RW_LOCK_UNLOCKED;
/*
* Wait queue for tape_delete_device waits.
*/
static DECLARE_WAIT_QUEUE_HEAD(tape_delete_wq);
/*
* Pointer to debug area.
*/
debug_info_t *tape_dbf_area = NULL;
/*
* Printable strings for tape enumerations.
*/
const char *tape_state_verbose[TS_SIZE] =
{
[TS_UNUSED] = "UNUSED", [TS_IN_USE] = "IN_USE",
[TS_INIT] = "INIT ", [TS_NOT_OPER] = "NOT_OP"
};
const char *tape_op_verbose[TO_SIZE] =
{
[TO_BLOCK] = "BLK", [TO_BSB] = "BSB",
[TO_BSF] = "BSF", [TO_DSE] = "DSE",
[TO_FSB] = "FSB", [TO_FSF] = "FSF",
[TO_LBL] = "LBL", [TO_NOP] = "NOP",
[TO_RBA] = "RBA", [TO_RBI] = "RBI",
[TO_RFO] = "RFO", [TO_REW] = "REW",
[TO_RUN] = "RUN", [TO_WRI] = "WRI",
[TO_WTM] = "WTM", [TO_MSEN] = "MSN",
[TO_LOAD] = "LOA", [TO_READ_CONFIG] = "RCF",
[TO_READ_ATTMSG] = "RAT",
[TO_DIS] = "DIS", [TO_ASSIGN] = "ASS",
[TO_UNASSIGN] = "UAS"
};
/*
* Tape state functions
*/
static void
tape_state_set(struct tape_device *device, enum tape_state newstate)
{
const char *str;
if (device->tape_state == TS_NOT_OPER) {
DBF_EVENT(3, "ts_set err: not oper\n");
return;
}
DBF_EVENT(4, "ts. dev: %x\n", device->first_minor);
if (device->tape_state < TO_SIZE && device->tape_state >= 0)
str = tape_state_verbose[device->tape_state];
else
str = "UNKNOWN TS";
DBF_EVENT(4, "old ts: %s\n", str);
if (device->tape_state < TO_SIZE && device->tape_state >=0 )
str = tape_state_verbose[device->tape_state];
else
str = "UNKNOWN TS";
DBF_EVENT(4, "%s\n", str);
DBF_EVENT(4, "new ts:\t\n");
if (newstate < TO_SIZE && newstate >= 0)
str = tape_state_verbose[newstate];
else
str = "UNKNOWN TS";
DBF_EVENT(4, "%s\n", str);
device->tape_state = newstate;
wake_up(&device->state_change_wq);
}
void
tape_med_state_set(struct tape_device *device, enum tape_medium_state newstate)
{
if (device->medium_state == newstate)
return;
switch(newstate){
case MS_UNLOADED:
device->tape_generic_status |= GMT_DR_OPEN(~0);
PRINT_INFO("(%s): Tape is unloaded\n",
device->cdev->dev.bus_id);
break;
case MS_LOADED:
device->tape_generic_status &= ~GMT_DR_OPEN(~0);
PRINT_INFO("(%s): Tape has been mounted\n",
device->cdev->dev.bus_id);
break;
default:
// print nothing
break;
}
device->medium_state = newstate;
wake_up(&device->state_change_wq);
}
/*
* Stop running ccw. Has to be called with the device lock held.
*/
static inline int
__tape_halt_io(struct tape_device *device, struct tape_request *request)
{
int retries;
int rc;
/* Check if interrupt has already been processed */
if (request->callback == NULL)
return 0;
rc = 0;
for (retries = 0; retries < 5; retries++) {
if (retries < 2)
rc = ccw_device_halt(device->cdev, (long) request);
else
rc = ccw_device_clear(device->cdev, (long) request);
if (rc == 0)
break; /* termination successful */
if (rc == -ENODEV)
DBF_EXCEPTION(2, "device gone, retry\n");
else if (rc == -EIO)
DBF_EXCEPTION(2, "I/O error, retry\n");
else if (rc == -EBUSY)
DBF_EXCEPTION(2, "device busy, retry late\n");
else
BUG();
}
if (rc == 0)
request->status = TAPE_REQUEST_DONE;
return rc;
}
/*
* Add device into the sorted list, giving it the first
* available minor number.
*/
static int
tape_assign_minor(struct tape_device *device)
{
struct tape_device *tmp;
int minor;
minor = 0;
write_lock(&tape_device_lock);
list_for_each_entry(tmp, &tape_device_list, node) {
if (minor < tmp->first_minor)
break;
minor += TAPE_MINORS_PER_DEV;
}
if (minor >= 256) {
write_unlock(&tape_device_lock);
return -ENODEV;
}
device->first_minor = minor;
list_add_tail(&device->node, &tmp->node);
write_unlock(&tape_device_lock);
return 0;
}
/* remove device from the list */
static void
tape_remove_minor(struct tape_device *device)
{
write_lock(&tape_device_lock);
list_del_init(&device->node);
device->first_minor = -1;
write_unlock(&tape_device_lock);
}
/*
* Enable tape device
*/
int
tape_enable_device(struct tape_device *device,
struct tape_discipline *discipline)
{
int rc;
if (device->tape_state != TS_INIT)
return -EINVAL;
/* Let the discipline have a go at the device. */
device->discipline = discipline;
rc = discipline->setup_device(device);
if (rc)
goto out;
rc = tape_assign_minor(device);
if (rc)
goto out_discipline;
rc = tapechar_setup_device(device);
if (rc)
goto out_minor;
rc = tapeblock_setup_device(device);
if (rc)
goto out_char;
tape_state_set(device, TS_UNUSED);
return 0;
out_char:
tapechar_cleanup_device(device);
out_discipline:
device->discipline->cleanup_device(device);
device->discipline = NULL;
out_minor:
tape_remove_minor(device);
out:
return rc;
}
/*
* Disable tape device. Check if there is a running request and
* terminate it. Post all queued requests with -EIO.
*/
void
tape_disable_device(struct tape_device *device)
{
struct list_head *l, *n;
struct tape_request *request;
spin_lock_irq(get_ccwdev_lock(device->cdev));
tape_state_set(device, TS_NOT_OPER);
/* Post remaining requests with -EIO */
list_for_each_safe(l, n, &device->req_queue) {
request = list_entry(l, struct tape_request, list);
if (request->status == TAPE_REQUEST_IN_IO)
__tape_halt_io(device, request);
list_del(&request->list);
/* Decrease ref_count for removed request. */
tape_put_device(device);
request->rc = -EIO;
if (request->callback != NULL)
request->callback(request, request->callback_data);
}
spin_unlock_irq(get_ccwdev_lock(device->cdev));
tapeblock_cleanup_device(device);
tapechar_cleanup_device(device);
device->discipline->cleanup_device(device);
tape_remove_minor(device);
}
/*
* Allocate memory for a new device structure.
*/
static struct tape_device *
tape_alloc_device(void)
{
struct tape_device *device;
device = (struct tape_device *)
kmalloc(sizeof(struct tape_device), GFP_KERNEL);
if (device == NULL) {
DBF_EXCEPTION(2, "ti:no mem\n");
PRINT_INFO ("can't allocate memory for "
"tape info structure\n");
return ERR_PTR(-ENOMEM);
}
memset(device, 0, sizeof(struct tape_device));
device->modeset_byte = (char *) kmalloc(1, GFP_KERNEL | GFP_DMA);
if (device->modeset_byte == NULL) {
DBF_EXCEPTION(2, "ti:no mem\n");
PRINT_INFO("can't allocate memory for modeset byte\n");
kfree(device);
return ERR_PTR(-ENOMEM);
}
INIT_LIST_HEAD(&device->req_queue);
INIT_LIST_HEAD(&device->node);
init_waitqueue_head(&device->state_change_wq);
device->tape_state = TS_INIT;
device->medium_state = MS_UNKNOWN;
*device->modeset_byte = 0;
return device;
}
/*
* Free memory of a device structure.
*/
static void
tape_free_device(struct tape_device *device)
{
kfree(device->modeset_byte);
kfree(device);
}
/*
* Find tape device by a device index.
*/
struct tape_device *
tape_get_device(int devindex)
{
struct tape_device *device, *tmp;
device = ERR_PTR(-ENODEV);
read_lock(&tape_device_lock);
list_for_each_entry(tmp, &tape_device_list, node) {
if (tmp->first_minor * TAPE_MINORS_PER_DEV == devindex) {
device = tmp;
atomic_inc(&device->ref_count);
break;
}
}
read_unlock(&tape_device_lock);
return device;
}
/*
* Decrease the reference counter of a devices structure. If the
* reference counter reaches zero free the device structure and
* wake up sleepers.
*/
void
tape_put_device(struct tape_device *device)
{
if (atomic_dec_return(&device->ref_count) > 0)
return;
/*
* Reference counter dropped to zero. This means
* that the device is deleted and the last user
* of the device structure is gone. That is what
* tape_delete_device is waiting for. Do a wake up.
*/
wake_up(&tape_delete_wq);
}
/*
* Driverfs tape probe function.
*/
int
tape_generic_probe(struct ccw_device *cdev)
{
struct tape_device *device;
char *bus_id = cdev->dev.bus_id;
device = tape_alloc_device();
if (IS_ERR(device))
return -ENODEV;
PRINT_INFO("tape device %s found\n", bus_id);
atomic_inc(&device->ref_count);
cdev->dev.driver_data = device;
device->cdev = cdev;
cdev->handler = tape_do_irq;
ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP);
return 0;
}
/*
* Driverfs tape remove function.
*/
int
tape_generic_remove(struct ccw_device *cdev)
{
struct tape_device *device;
device = cdev->dev.driver_data;
cdev->dev.driver_data = NULL;
if (device != NULL) {
tape_put_device(device);
wait_event(tape_delete_wq, atomic_read(&device->ref_count) == 0);
tape_free_device(device);
}
return 0;
}
/*
* Allocate a new tape ccw request
*/
struct tape_request *
tape_alloc_request(int cplength, int datasize)
{
struct tape_request *request;
if (datasize > PAGE_SIZE || (cplength*sizeof(struct ccw1)) > PAGE_SIZE)
BUG();
request = (struct tape_request *) kmalloc(sizeof(struct tape_request),
GFP_KERNEL);
if (request == NULL) {
DBF_EXCEPTION(1, "cqra nomem\n");
return ERR_PTR(-ENOMEM);
}
memset(request, 0, sizeof(struct tape_request));
/* allocate channel program */
if (cplength > 0) {
request->cpaddr = kmalloc(cplength*sizeof(struct ccw1),
GFP_ATOMIC | GFP_DMA);
if (request->cpaddr == NULL) {
DBF_EXCEPTION(1, "cqra nomem\n");
kfree(request);
return ERR_PTR(-ENOMEM);
}
memset(request->cpaddr, 0, cplength*sizeof(struct ccw1));
}
/* alloc small kernel buffer */
if (datasize > 0) {
request->cpdata = kmalloc(datasize, GFP_KERNEL | GFP_DMA);
if (request->cpdata == NULL) {
DBF_EXCEPTION(1, "cqra nomem\n");
if (request->cpaddr != NULL)
kfree(request->cpaddr);
kfree(request);
return ERR_PTR(-ENOMEM);
}
memset(request->cpdata, 0, datasize);
}
return request;
}
/*
* Free tape ccw request
*/
void
tape_free_request (struct tape_request * request)
{
if (request->device != NULL) {
tape_put_device(request->device);
request->device = NULL;
}
if (request->cpdata != NULL)
kfree(request->cpdata);
if (request->cpaddr != NULL)
kfree(request->cpaddr);
kfree(request);
}
/*
* Write sense data to console/dbf
*/
void
tape_dump_sense(struct tape_device* device, struct tape_request *request,
struct irb *irb)
{
unsigned int *sptr;
PRINT_INFO("-------------------------------------------------\n");
PRINT_INFO("DSTAT : %02x CSTAT: %02x CPA: %04x\n",
irb->scsw.dstat, irb->scsw.cstat, irb->scsw.cpa);
PRINT_INFO("DEVICE: %s\n", device->cdev->dev.bus_id);
if (request != NULL)
PRINT_INFO("OP : %s\n", tape_op_verbose[request->op]);
sptr = (unsigned int *) irb->ecw;
PRINT_INFO("Sense data: %08X %08X %08X %08X \n",
sptr[0], sptr[1], sptr[2], sptr[3]);
PRINT_INFO("Sense data: %08X %08X %08X %08X \n",
sptr[4], sptr[5], sptr[6], sptr[7]);
PRINT_INFO("--------------------------------------------------\n");
}
/*
* Write sense data to dbf
*/
void
tape_dump_sense_dbf(struct tape_device *device, struct tape_request *request,
struct irb *irb)
{
unsigned int *sptr;
const char* op;
if (request != NULL)
op = tape_op_verbose[request->op];
else
op = "---";
DBF_EVENT(3, "DSTAT : %02x CSTAT: %02x\n",
irb->scsw.dstat,irb->scsw.cstat);
DBF_EVENT(3, "DEVICE: %s OP\t: %s\n", device->cdev->dev.bus_id,op);
sptr = (unsigned int *) irb->ecw;
DBF_EVENT(3, "%08x %08x\n", sptr[0], sptr[1]);
DBF_EVENT(3, "%08x %08x\n", sptr[2], sptr[3]);
DBF_EVENT(3, "%08x %08x\n", sptr[4], sptr[5]);
DBF_EVENT(3, "%08x %08x\n", sptr[6], sptr[7]);
}
/*
* I/O helper function. Adds the request to the request queue
* and starts it if the tape is idle. Has to be called with
* the device lock held.
*/
static inline int
__tape_do_io(struct tape_device *device, struct tape_request *request)
{
int rc;
if (device->tape_state != TS_IN_USE)
return -ENODEV;
/* Increase use count of device for the added request. */
atomic_inc(&device->ref_count);
request->device = device;
if (list_empty(&device->req_queue)) {
/* No other requests are on the queue. Start this one. */
#ifdef CONFIG_S390_TAPE_BLOCK
if (request->op == TO_BLOCK)
device->discipline->check_locate(device, request);
#endif
rc = ccw_device_start(device->cdev, request->cpaddr,
(unsigned long) request, 0x00,
request->options);
if (rc) {
DBF_EVENT(1, "tape: DOIO failed with rc = %i\n", rc);
return rc;
}
list_add(&request->list, &device->req_queue);
request->status = TAPE_REQUEST_IN_IO;
} else {
list_add_tail(&request->list, &device->req_queue);
request->status = TAPE_REQUEST_QUEUED;
}
return 0;
}
/*
* Add the request to the request queue, try to start it if the
* tape is idle. Return without waiting for end of i/o.
*/
int
tape_do_io_async(struct tape_device *device, struct tape_request *request)
{
int rc;
spin_lock_irq(get_ccwdev_lock(device->cdev));
/* Add request to request queue and try to start it. */
rc = __tape_do_io(device, request);
spin_unlock_irq(get_ccwdev_lock(device->cdev));
return rc;
}
/*
* tape_do_io/__tape_wake_up
* Add the request to the request queue, try to start it if the
* tape is idle and wait uninterruptible for its completion.
*/
static void
__tape_wake_up(struct tape_request *request, void *data)
{
request->callback = NULL;
wake_up((wait_queue_head_t *) data);
}
int
tape_do_io(struct tape_device *device, struct tape_request *request)
{
wait_queue_head_t wq;
int rc;
init_waitqueue_head(&wq);
spin_lock_irq(get_ccwdev_lock(device->cdev));
/* Setup callback */
request->callback = __tape_wake_up;
request->callback_data = &wq;
/* Add request to request queue and try to start it. */
rc = __tape_do_io(device, request);
spin_unlock_irq(get_ccwdev_lock(device->cdev));
if (rc)
return rc;
/* Request added to the queue. Wait for its completion. */
wait_event(wq, (request->callback == NULL));
/* Get rc from request */
return request->rc;
}
/*
* tape_do_io_interruptible/__tape_wake_up_interruptible
* Add the request to the request queue, try to start it if the
* tape is idle and wait uninterruptible for its completion.
*/
static void
__tape_wake_up_interruptible(struct tape_request *request, void *data)
{
request->callback = NULL;
wake_up_interruptible((wait_queue_head_t *) data);
}
int
tape_do_io_interruptible(struct tape_device *device,
struct tape_request *request)
{
wait_queue_head_t wq;
int rc;
init_waitqueue_head(&wq);
spin_lock_irq(get_ccwdev_lock(device->cdev));
/* Setup callback */
request->callback = __tape_wake_up_interruptible;
request->callback_data = &wq;
rc = __tape_do_io(device, request);
spin_unlock_irq(get_ccwdev_lock(device->cdev));
if (rc)
return rc;
/* Request added to the queue. Wait for its completion. */
rc = wait_event_interruptible(wq, (request->callback == NULL));
if (rc != -ERESTARTSYS)
/* Request finished normally. */
return request->rc;
/* Interrupted by a signal. We have to stop the current request. */
spin_lock_irq(get_ccwdev_lock(device->cdev));
rc = __tape_halt_io(device, request);
if (rc == 0) {
DBF_EVENT(3, "IO stopped on %s\n", device->cdev->dev.bus_id);
rc = -ERESTARTSYS;
}
spin_unlock_irq(get_ccwdev_lock(device->cdev));
return rc;
}
static inline void
__tape_do_io_list(struct tape_device *device)
{
struct list_head *l, *n;
struct tape_request *request;
int rc;
if (device->tape_state != TS_IN_USE)
return;
/*
* Try to start each request on request queue until one is
* started successful.
*/
list_for_each_safe(l, n, &device->req_queue) {
request = list_entry(l, struct tape_request, list);
#ifdef CONFIG_S390_TAPE_BLOCK
if (request->op == TO_BLOCK)
device->discipline->check_locate(device, request);
#endif
rc = ccw_device_start(device->cdev, request->cpaddr,
(unsigned long) request, 0x00,
request->options);
if (rc == 0) {
request->status = TAPE_REQUEST_IN_IO;
break;
}
/* Start failed. Remove request and indicate failure. */
DBF_EVENT(1, "tape: DOIO failed with er = %i\n", rc);
list_del(&request->list);
/* Set ending status and do callback. */
request->rc = rc;
request->status = TAPE_REQUEST_DONE;
if (request->callback != NULL)
request->callback(request, request->callback_data);
}
}
/*
* Tape interrupt routine, called from the ccw_device layer
*/
static void
tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
{
struct tape_device *device;
struct tape_request *request;
int final;
int rc;
device = (struct tape_device *) cdev->dev.driver_data;
if (device == NULL) {
PRINT_ERR("could not get device structure for bus_id %s "
"in interrupt\n", cdev->dev.bus_id);
return;
}
request = (struct tape_request *) intparm;
/* May be an unsolicited irq */
if(request != NULL)
request->rescnt = irb->scsw.count;
if (irb->scsw.dstat != 0x0c){
/* Set the 'ONLINE' flag depending on sense byte 1 */
if(*(((__u8 *) irb->ecw) + 1) & SENSE_DRIVE_ONLINE)
device->tape_generic_status |= GMT_ONLINE(~0);
else
device->tape_generic_status &= ~GMT_ONLINE(~0);
/*
* Any request that does not come back with channel end
* and device end is unusual. Log the sense data.
*/
DBF_EVENT(3,"-- Tape Interrupthandler --\n");
tape_dump_sense_dbf(device, request, irb);
} else {
/* Upon normal completion the device _is_ online */
device->tape_generic_status |= GMT_ONLINE(~0);
}
if (device->tape_state == TS_NOT_OPER) {
DBF_EVENT(6, "tape:device is not operational\n");
return;
}
rc = device->discipline->irq(device, request, irb);
/*
* rc < 0 : request finished unsuccessfully.
* rc == TAPE_IO_SUCCESS: request finished successfully.
* rc == TAPE_IO_PENDING: request is still running. Ignore rc.
* rc == TAPE_IO_RETRY: request finished but needs another go.
* rc == TAPE_IO_STOP: request needs to get terminated.
*/
final = 0;
switch (rc) {
case TAPE_IO_SUCCESS:
final = 1;
break;
case TAPE_IO_PENDING:
break;
case TAPE_IO_RETRY:
#ifdef CONFIG_S390_TAPE_BLOCK
if (request->op == TO_BLOCK)
device->discipline->check_locate(device, request);
#endif
rc = ccw_device_start(cdev, request->cpaddr,
(unsigned long) request, 0x00,
request->options);
if (rc) {
DBF_EVENT(1, "tape: DOIO failed with er = %i\n", rc);
final = 1;
}
break;
case TAPE_IO_STOP:
__tape_halt_io(device, request);
rc = -EIO;
final = 1;
break;
default:
if (rc > 0) {
DBF_EVENT(6, "xunknownrc\n");
PRINT_ERR("Invalid return code from discipline "
"interrupt function.\n");
rc = -EIO;
}
final = 1;
break;
}
if (final) {
/* May be an unsolicited irq */
if(request != NULL) {
/* Set ending status. */
request->rc = rc;
request->status = TAPE_REQUEST_DONE;
/* Remove from request queue. */
list_del(&request->list);
/* Do callback. */
if (request->callback != NULL)
request->callback(request, request->callback_data);
}
/* Start next request. */
__tape_do_io_list(device);
}
}
/*
* Lock a shared tape for our exclusive use.
*/
int
tape_assign(struct tape_device *device)
{
int rc;
rc = device->discipline->assign(device);
if (rc) {
PRINT_WARN("(%s): assign failed - device might be busy\n",
device->cdev->dev.bus_id);
DBF_EVENT(3, "(%s): assign failed - device might be busy\n",
device->cdev->dev.bus_id);
return rc;
}
DBF_EVENT(3, "(%s): assign lpum = %02x\n",
device->cdev->dev.bus_id,
0 /* FIXME: device->devstat.lpum */ );
return 0;
}
/*
* Unlock a shared tape.
*/
int
tape_unassign(struct tape_device *device)
{
int rc;
rc = device->discipline->unassign(device);
if (rc) {
PRINT_WARN("(%s): unassign failed\n",
device->cdev->dev.bus_id);
DBF_EVENT(3, "(%s): unassign failed\n",
device->cdev->dev.bus_id);
return rc;
}
DBF_EVENT(3, "(%s): unassign lpum = %02x\n",
device->cdev->dev.bus_id,
0 /* FIXME: device->devstat.lpum */ );
return 0;
}
/*
* Tape device open function used by tape_char & tape_block frontends.
*/
int
tape_open(struct tape_device *device)
{
int rc;
spin_lock(get_ccwdev_lock(device->cdev));
if (device->tape_state == TS_NOT_OPER) {
DBF_EVENT(6, "TAPE:nodev\n");
rc = -ENODEV;
} else if (device->tape_state == TS_IN_USE) {
DBF_EVENT(6, "TAPE:dbusy\n");
rc = -EBUSY;
} else if (device->discipline != NULL &&
!try_module_get(device->discipline->owner)) {
DBF_EVENT(6, "TAPE:nodisc\n");
rc = -ENODEV;
} else {
tape_state_set(device, TS_IN_USE);
rc = 0;
}
spin_unlock(get_ccwdev_lock(device->cdev));
return rc;
}
/*
* Tape device release function used by tape_char & tape_block frontends.
*/
int
tape_release(struct tape_device *device)
{
spin_lock(get_ccwdev_lock(device->cdev));
if (device->tape_state == TS_IN_USE)
tape_state_set(device, TS_UNUSED);
module_put(device->discipline->owner);
spin_unlock(get_ccwdev_lock(device->cdev));
return 0;
}
/*
* Execute a magnetic tape command a number of times.
*/
int
tape_mtop(struct tape_device *device, int mt_op, int mt_count)
{
tape_mtop_fn fn;
int rc;
DBF_EVENT(6, "TAPE:mtio\n");
DBF_EVENT(6, "TAPE:ioop: %x\n", mt_op);
DBF_EVENT(6, "TAPE:arg: %x\n", mt_count);
if (mt_op < 0 || mt_op >= TAPE_NR_MTOPS)
return -EINVAL;
fn = device->discipline->mtop_array[mt_op];
if (fn == NULL)
return -EINVAL;
/* We assume that the backends can handle count up to 500. */
if (mt_op == MTBSR || mt_op == MTFSR || mt_op == MTFSF ||
mt_op == MTBSR || mt_op == MTFSFM || mt_op == MTBSFM) {
rc = 0;
for (; mt_count > 500; mt_count -= 500)
if ((rc = fn(device, 500)) != 0)
break;
if (rc == 0)
rc = fn(device, mt_count);
} else
rc = fn(device, mt_count);
return rc;
}
/*
* Tape init function.
*/
static int
tape_init (void)
{
tape_dbf_area = debug_register ( "tape", 1, 2, 3*sizeof(long));
debug_register_view(tape_dbf_area, &debug_sprintf_view);
DBF_EVENT(3, "tape init: ($Revision: 1.26 $)\n");
tape_proc_init();
tapechar_init ();
tapeblock_init ();
return 0;
}
/*
* Tape exit function.
*/
static void
tape_exit(void)
{
DBF_EVENT(6, "tape exit\n");
/* Get rid of the frontends */
tapechar_exit();
tapeblock_exit();
tape_proc_cleanup();
debug_unregister (tape_dbf_area);
}
MODULE_AUTHOR("(C) 2001 IBM Deutschland Entwicklung GmbH by Carsten Otte and "
"Michael Holzheu (cotte@de.ibm.com,holzheu@de.ibm.com)");
MODULE_DESCRIPTION("Linux on zSeries channel attached "
"tape device driver ($Revision: 1.26 $)");
module_init(tape_init);
module_exit(tape_exit);
EXPORT_SYMBOL(tape_dbf_area);
EXPORT_SYMBOL(tape_generic_remove);
EXPORT_SYMBOL(tape_disable_device);
EXPORT_SYMBOL(tape_generic_probe);
EXPORT_SYMBOL(tape_enable_device);
EXPORT_SYMBOL(tape_put_device);
EXPORT_SYMBOL(tape_state_verbose);
EXPORT_SYMBOL(tape_op_verbose);
EXPORT_SYMBOL(tape_state_set);
EXPORT_SYMBOL(tape_med_state_set);
EXPORT_SYMBOL(tape_alloc_request);
EXPORT_SYMBOL(tape_free_request);
EXPORT_SYMBOL(tape_dump_sense);
EXPORT_SYMBOL(tape_dump_sense_dbf);
EXPORT_SYMBOL(tape_do_io);
EXPORT_SYMBOL(tape_do_io_async);
EXPORT_SYMBOL(tape_do_io_interruptible);
EXPORT_SYMBOL(tape_mtop);
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