2 * drivers/s390/char/tape_core.c
3 * basic function of the tape device driver
5 * S390 and zSeries version
6 * Copyright IBM Corp. 2001, 2009
7 * Author(s): Carsten Otte <cotte@de.ibm.com>
8 * Michael Holzheu <holzheu@de.ibm.com>
9 * Tuan Ngo-Anh <ngoanh@de.ibm.com>
10 * Martin Schwidefsky <schwidefsky@de.ibm.com>
11 * Stefan Bader <shbader@de.ibm.com>
14 #define KMSG_COMPONENT "tape"
15 #include <linux/module.h>
16 #include <linux/init.h> // for kernel parameters
17 #include <linux/kmod.h> // for requesting modules
18 #include <linux/spinlock.h> // for locks
19 #include <linux/vmalloc.h>
20 #include <linux/list.h>
22 #include <asm/types.h> // for variable types
24 #define TAPE_DBF_AREA tape_core_dbf
29 #define LONG_BUSY_TIMEOUT 180 /* seconds */
31 static void __tape_do_irq (struct ccw_device *, unsigned long, struct irb *);
32 static void tape_delayed_next_request(struct work_struct *);
33 static void tape_long_busy_timeout(unsigned long data);
36 * One list to contain all tape devices of all disciplines, so
37 * we can assign the devices to minor numbers of the same major
38 * The list is protected by the rwlock
40 static LIST_HEAD(tape_device_list);
41 static DEFINE_RWLOCK(tape_device_lock);
44 * Pointer to debug area.
46 debug_info_t *TAPE_DBF_AREA = NULL;
47 EXPORT_SYMBOL(TAPE_DBF_AREA);
50 * Printable strings for tape enumerations.
52 const char *tape_state_verbose[TS_SIZE] =
54 [TS_UNUSED] = "UNUSED",
55 [TS_IN_USE] = "IN_USE",
56 [TS_BLKUSE] = "BLKUSE",
58 [TS_NOT_OPER] = "NOT_OP"
61 const char *tape_op_verbose[TO_SIZE] =
63 [TO_BLOCK] = "BLK", [TO_BSB] = "BSB",
64 [TO_BSF] = "BSF", [TO_DSE] = "DSE",
65 [TO_FSB] = "FSB", [TO_FSF] = "FSF",
66 [TO_LBL] = "LBL", [TO_NOP] = "NOP",
67 [TO_RBA] = "RBA", [TO_RBI] = "RBI",
68 [TO_RFO] = "RFO", [TO_REW] = "REW",
69 [TO_RUN] = "RUN", [TO_WRI] = "WRI",
70 [TO_WTM] = "WTM", [TO_MSEN] = "MSN",
71 [TO_LOAD] = "LOA", [TO_READ_CONFIG] = "RCF",
72 [TO_READ_ATTMSG] = "RAT",
73 [TO_DIS] = "DIS", [TO_ASSIGN] = "ASS",
74 [TO_UNASSIGN] = "UAS", [TO_CRYPT_ON] = "CON",
75 [TO_CRYPT_OFF] = "COF", [TO_KEKL_SET] = "KLS",
76 [TO_KEKL_QUERY] = "KLQ",[TO_RDC] = "RDC",
79 static int devid_to_int(struct ccw_dev_id *dev_id)
81 return dev_id->devno + (dev_id->ssid << 16);
85 * Some channel attached tape specific attributes.
87 * FIXME: In the future the first_minor and blocksize attribute should be
88 * replaced by a link to the cdev tree.
91 tape_medium_state_show(struct device *dev, struct device_attribute *attr, char *buf)
93 struct tape_device *tdev;
95 tdev = dev_get_drvdata(dev);
96 return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->medium_state);
100 DEVICE_ATTR(medium_state, 0444, tape_medium_state_show, NULL);
103 tape_first_minor_show(struct device *dev, struct device_attribute *attr, char *buf)
105 struct tape_device *tdev;
107 tdev = dev_get_drvdata(dev);
108 return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->first_minor);
112 DEVICE_ATTR(first_minor, 0444, tape_first_minor_show, NULL);
115 tape_state_show(struct device *dev, struct device_attribute *attr, char *buf)
117 struct tape_device *tdev;
119 tdev = dev_get_drvdata(dev);
120 return scnprintf(buf, PAGE_SIZE, "%s\n", (tdev->first_minor < 0) ?
121 "OFFLINE" : tape_state_verbose[tdev->tape_state]);
125 DEVICE_ATTR(state, 0444, tape_state_show, NULL);
128 tape_operation_show(struct device *dev, struct device_attribute *attr, char *buf)
130 struct tape_device *tdev;
133 tdev = dev_get_drvdata(dev);
134 if (tdev->first_minor < 0)
135 return scnprintf(buf, PAGE_SIZE, "N/A\n");
137 spin_lock_irq(get_ccwdev_lock(tdev->cdev));
138 if (list_empty(&tdev->req_queue))
139 rc = scnprintf(buf, PAGE_SIZE, "---\n");
141 struct tape_request *req;
143 req = list_entry(tdev->req_queue.next, struct tape_request,
145 rc = scnprintf(buf,PAGE_SIZE, "%s\n", tape_op_verbose[req->op]);
147 spin_unlock_irq(get_ccwdev_lock(tdev->cdev));
152 DEVICE_ATTR(operation, 0444, tape_operation_show, NULL);
155 tape_blocksize_show(struct device *dev, struct device_attribute *attr, char *buf)
157 struct tape_device *tdev;
159 tdev = dev_get_drvdata(dev);
161 return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->char_data.block_size);
165 DEVICE_ATTR(blocksize, 0444, tape_blocksize_show, NULL);
167 static struct attribute *tape_attrs[] = {
168 &dev_attr_medium_state.attr,
169 &dev_attr_first_minor.attr,
170 &dev_attr_state.attr,
171 &dev_attr_operation.attr,
172 &dev_attr_blocksize.attr,
176 static struct attribute_group tape_attr_group = {
181 * Tape state functions
184 tape_state_set(struct tape_device *device, enum tape_state newstate)
188 if (device->tape_state == TS_NOT_OPER) {
189 DBF_EVENT(3, "ts_set err: not oper\n");
192 DBF_EVENT(4, "ts. dev: %x\n", device->first_minor);
193 DBF_EVENT(4, "old ts:\t\n");
194 if (device->tape_state < TS_SIZE && device->tape_state >=0 )
195 str = tape_state_verbose[device->tape_state];
198 DBF_EVENT(4, "%s\n", str);
199 DBF_EVENT(4, "new ts:\t\n");
200 if (newstate < TS_SIZE && newstate >= 0)
201 str = tape_state_verbose[newstate];
204 DBF_EVENT(4, "%s\n", str);
205 device->tape_state = newstate;
206 wake_up(&device->state_change_wq);
210 tape_med_state_set(struct tape_device *device, enum tape_medium_state newstate)
212 if (device->medium_state == newstate)
216 device->tape_generic_status |= GMT_DR_OPEN(~0);
217 if (device->medium_state == MS_LOADED)
218 pr_info("%s: The tape cartridge has been successfully "
219 "unloaded\n", dev_name(&device->cdev->dev));
222 device->tape_generic_status &= ~GMT_DR_OPEN(~0);
223 if (device->medium_state == MS_UNLOADED)
224 pr_info("%s: A tape cartridge has been mounted\n",
225 dev_name(&device->cdev->dev));
231 device->medium_state = newstate;
232 wake_up(&device->state_change_wq);
236 * Stop running ccw. Has to be called with the device lock held.
239 __tape_cancel_io(struct tape_device *device, struct tape_request *request)
244 /* Check if interrupt has already been processed */
245 if (request->callback == NULL)
249 for (retries = 0; retries < 5; retries++) {
250 rc = ccw_device_clear(device->cdev, (long) request);
254 request->status = TAPE_REQUEST_DONE;
257 request->status = TAPE_REQUEST_CANCEL;
258 schedule_delayed_work(&device->tape_dnr, 0);
261 DBF_EXCEPTION(2, "device gone, retry\n");
264 DBF_EXCEPTION(2, "I/O error, retry\n");
275 * Add device into the sorted list, giving it the first
276 * available minor number.
279 tape_assign_minor(struct tape_device *device)
281 struct tape_device *tmp;
285 write_lock(&tape_device_lock);
286 list_for_each_entry(tmp, &tape_device_list, node) {
287 if (minor < tmp->first_minor)
289 minor += TAPE_MINORS_PER_DEV;
292 write_unlock(&tape_device_lock);
295 device->first_minor = minor;
296 list_add_tail(&device->node, &tmp->node);
297 write_unlock(&tape_device_lock);
301 /* remove device from the list */
303 tape_remove_minor(struct tape_device *device)
305 write_lock(&tape_device_lock);
306 list_del_init(&device->node);
307 device->first_minor = -1;
308 write_unlock(&tape_device_lock);
312 * Set a device online.
314 * This function is called by the common I/O layer to move a device from the
315 * detected but offline into the online state.
316 * If we return an error (RC < 0) the device remains in the offline state. This
317 * can happen if the device is assigned somewhere else, for example.
320 tape_generic_online(struct tape_device *device,
321 struct tape_discipline *discipline)
325 DBF_LH(6, "tape_enable_device(%p, %p)\n", device, discipline);
327 if (device->tape_state != TS_INIT) {
328 DBF_LH(3, "Tapestate not INIT (%d)\n", device->tape_state);
332 init_timer(&device->lb_timeout);
333 device->lb_timeout.function = tape_long_busy_timeout;
335 /* Let the discipline have a go at the device. */
336 device->discipline = discipline;
337 if (!try_module_get(discipline->owner)) {
341 rc = discipline->setup_device(device);
344 rc = tape_assign_minor(device);
348 rc = tapechar_setup_device(device);
351 rc = tapeblock_setup_device(device);
355 tape_state_set(device, TS_UNUSED);
357 DBF_LH(3, "(%08x): Drive set online\n", device->cdev_id);
362 tapechar_cleanup_device(device);
364 tape_remove_minor(device);
366 device->discipline->cleanup_device(device);
367 device->discipline = NULL;
369 module_put(discipline->owner);
374 tape_cleanup_device(struct tape_device *device)
376 tapeblock_cleanup_device(device);
377 tapechar_cleanup_device(device);
378 device->discipline->cleanup_device(device);
379 module_put(device->discipline->owner);
380 tape_remove_minor(device);
381 tape_med_state_set(device, MS_UNKNOWN);
387 * Called by the common I/O layer if the drive should be suspended on user
388 * request. We refuse to suspend if the device is loaded or in use for the
390 * While the Linux guest is suspended, it might be logged off which causes
391 * devices to be detached. Tape devices are automatically rewound and unloaded
392 * during DETACH processing (unless the tape device was attached with the
393 * NOASSIGN or MULTIUSER option). After rewind/unload, there is no way to
394 * resume the original state of the tape device, since we would need to
395 * manually re-load the cartridge which was active at suspend time.
397 int tape_generic_pm_suspend(struct ccw_device *cdev)
399 struct tape_device *device;
401 device = dev_get_drvdata(&cdev->dev);
406 DBF_LH(3, "(%08x): tape_generic_pm_suspend(%p)\n",
407 device->cdev_id, device);
409 if (device->medium_state != MS_UNLOADED) {
410 pr_err("A cartridge is loaded in tape device %s, "
411 "refusing to suspend\n", dev_name(&cdev->dev));
415 spin_lock_irq(get_ccwdev_lock(device->cdev));
416 switch (device->tape_state) {
420 spin_unlock_irq(get_ccwdev_lock(device->cdev));
423 pr_err("Tape device %s is busy, refusing to "
424 "suspend\n", dev_name(&cdev->dev));
425 spin_unlock_irq(get_ccwdev_lock(device->cdev));
429 DBF_LH(3, "(%08x): Drive suspended.\n", device->cdev_id);
434 * Set device offline.
436 * Called by the common I/O layer if the drive should set offline on user
437 * request. We may prevent this by returning an error.
438 * Manual offline is only allowed while the drive is not in use.
441 tape_generic_offline(struct ccw_device *cdev)
443 struct tape_device *device;
445 device = dev_get_drvdata(&cdev->dev);
450 DBF_LH(3, "(%08x): tape_generic_offline(%p)\n",
451 device->cdev_id, device);
453 spin_lock_irq(get_ccwdev_lock(device->cdev));
454 switch (device->tape_state) {
457 spin_unlock_irq(get_ccwdev_lock(device->cdev));
460 tape_state_set(device, TS_INIT);
461 spin_unlock_irq(get_ccwdev_lock(device->cdev));
462 tape_cleanup_device(device);
465 DBF_EVENT(3, "(%08x): Set offline failed "
468 spin_unlock_irq(get_ccwdev_lock(device->cdev));
472 DBF_LH(3, "(%08x): Drive set offline.\n", device->cdev_id);
477 * Allocate memory for a new device structure.
479 static struct tape_device *
480 tape_alloc_device(void)
482 struct tape_device *device;
484 device = kzalloc(sizeof(struct tape_device), GFP_KERNEL);
485 if (device == NULL) {
486 DBF_EXCEPTION(2, "ti:no mem\n");
487 return ERR_PTR(-ENOMEM);
489 device->modeset_byte = kmalloc(1, GFP_KERNEL | GFP_DMA);
490 if (device->modeset_byte == NULL) {
491 DBF_EXCEPTION(2, "ti:no mem\n");
493 return ERR_PTR(-ENOMEM);
495 INIT_LIST_HEAD(&device->req_queue);
496 INIT_LIST_HEAD(&device->node);
497 init_waitqueue_head(&device->state_change_wq);
498 init_waitqueue_head(&device->wait_queue);
499 device->tape_state = TS_INIT;
500 device->medium_state = MS_UNKNOWN;
501 *device->modeset_byte = 0;
502 device->first_minor = -1;
503 atomic_set(&device->ref_count, 1);
504 INIT_DELAYED_WORK(&device->tape_dnr, tape_delayed_next_request);
510 * Get a reference to an existing device structure. This will automatically
511 * increment the reference count.
514 tape_get_device(struct tape_device *device)
518 count = atomic_inc_return(&device->ref_count);
519 DBF_EVENT(4, "tape_get_device(%p) = %i\n", device, count);
524 * Decrease the reference counter of a devices structure. If the
525 * reference counter reaches zero free the device structure.
526 * The function returns a NULL pointer to be used by the caller
527 * for clearing reference pointers.
530 tape_put_device(struct tape_device *device)
534 count = atomic_dec_return(&device->ref_count);
535 DBF_EVENT(4, "tape_put_device(%p) -> %i\n", device, count);
538 kfree(device->modeset_byte);
544 * Find tape device by a device index.
547 tape_find_device(int devindex)
549 struct tape_device *device, *tmp;
551 device = ERR_PTR(-ENODEV);
552 read_lock(&tape_device_lock);
553 list_for_each_entry(tmp, &tape_device_list, node) {
554 if (tmp->first_minor / TAPE_MINORS_PER_DEV == devindex) {
555 device = tape_get_device(tmp);
559 read_unlock(&tape_device_lock);
564 * Driverfs tape probe function.
567 tape_generic_probe(struct ccw_device *cdev)
569 struct tape_device *device;
571 struct ccw_dev_id dev_id;
573 device = tape_alloc_device();
576 ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP |
577 CCWDEV_DO_MULTIPATH);
578 ret = sysfs_create_group(&cdev->dev.kobj, &tape_attr_group);
580 tape_put_device(device);
583 dev_set_drvdata(&cdev->dev, device);
584 cdev->handler = __tape_do_irq;
586 ccw_device_get_id(cdev, &dev_id);
587 device->cdev_id = devid_to_int(&dev_id);
592 __tape_discard_requests(struct tape_device *device)
594 struct tape_request * request;
595 struct list_head * l, *n;
597 list_for_each_safe(l, n, &device->req_queue) {
598 request = list_entry(l, struct tape_request, list);
599 if (request->status == TAPE_REQUEST_IN_IO)
600 request->status = TAPE_REQUEST_DONE;
601 list_del(&request->list);
603 /* Decrease ref_count for removed request. */
604 request->device = NULL;
605 tape_put_device(device);
607 if (request->callback != NULL)
608 request->callback(request, request->callback_data);
613 * Driverfs tape remove function.
615 * This function is called whenever the common I/O layer detects the device
616 * gone. This can happen at any time and we cannot refuse.
619 tape_generic_remove(struct ccw_device *cdev)
621 struct tape_device * device;
623 device = dev_get_drvdata(&cdev->dev);
627 DBF_LH(3, "(%08x): tape_generic_remove(%p)\n", device->cdev_id, cdev);
629 spin_lock_irq(get_ccwdev_lock(device->cdev));
630 switch (device->tape_state) {
632 tape_state_set(device, TS_NOT_OPER);
637 spin_unlock_irq(get_ccwdev_lock(device->cdev));
641 * Need only to release the device.
643 tape_state_set(device, TS_NOT_OPER);
644 spin_unlock_irq(get_ccwdev_lock(device->cdev));
645 tape_cleanup_device(device);
649 * There may be requests on the queue. We will not get
650 * an interrupt for a request that was running. So we
651 * just post them all as I/O errors.
653 DBF_EVENT(3, "(%08x): Drive in use vanished!\n",
655 pr_warning("%s: A tape unit was detached while in "
656 "use\n", dev_name(&device->cdev->dev));
657 tape_state_set(device, TS_NOT_OPER);
658 __tape_discard_requests(device);
659 spin_unlock_irq(get_ccwdev_lock(device->cdev));
660 tape_cleanup_device(device);
663 device = dev_get_drvdata(&cdev->dev);
665 sysfs_remove_group(&cdev->dev.kobj, &tape_attr_group);
666 dev_set_drvdata(&cdev->dev, NULL);
667 tape_put_device(device);
672 * Allocate a new tape ccw request
674 struct tape_request *
675 tape_alloc_request(int cplength, int datasize)
677 struct tape_request *request;
679 BUG_ON(datasize > PAGE_SIZE || (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
681 DBF_LH(6, "tape_alloc_request(%d, %d)\n", cplength, datasize);
683 request = kzalloc(sizeof(struct tape_request), GFP_KERNEL);
684 if (request == NULL) {
685 DBF_EXCEPTION(1, "cqra nomem\n");
686 return ERR_PTR(-ENOMEM);
688 /* allocate channel program */
690 request->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
691 GFP_ATOMIC | GFP_DMA);
692 if (request->cpaddr == NULL) {
693 DBF_EXCEPTION(1, "cqra nomem\n");
695 return ERR_PTR(-ENOMEM);
698 /* alloc small kernel buffer */
700 request->cpdata = kzalloc(datasize, GFP_KERNEL | GFP_DMA);
701 if (request->cpdata == NULL) {
702 DBF_EXCEPTION(1, "cqra nomem\n");
703 kfree(request->cpaddr);
705 return ERR_PTR(-ENOMEM);
708 DBF_LH(6, "New request %p(%p/%p)\n", request, request->cpaddr,
715 * Free tape ccw request
718 tape_free_request (struct tape_request * request)
720 DBF_LH(6, "Free request %p\n", request);
723 tape_put_device(request->device);
724 kfree(request->cpdata);
725 kfree(request->cpaddr);
730 __tape_start_io(struct tape_device *device, struct tape_request *request)
734 #ifdef CONFIG_S390_TAPE_BLOCK
735 if (request->op == TO_BLOCK)
736 device->discipline->check_locate(device, request);
738 rc = ccw_device_start(
741 (unsigned long) request,
746 request->status = TAPE_REQUEST_IN_IO;
747 } else if (rc == -EBUSY) {
748 /* The common I/O subsystem is currently busy. Retry later. */
749 request->status = TAPE_REQUEST_QUEUED;
750 schedule_delayed_work(&device->tape_dnr, 0);
753 /* Start failed. Remove request and indicate failure. */
754 DBF_EVENT(1, "tape: start request failed with RC = %i\n", rc);
760 __tape_start_next_request(struct tape_device *device)
762 struct list_head *l, *n;
763 struct tape_request *request;
766 DBF_LH(6, "__tape_start_next_request(%p)\n", device);
768 * Try to start each request on request queue until one is
769 * started successful.
771 list_for_each_safe(l, n, &device->req_queue) {
772 request = list_entry(l, struct tape_request, list);
775 * Avoid race condition if bottom-half was triggered more than
778 if (request->status == TAPE_REQUEST_IN_IO)
781 * Request has already been stopped. We have to wait until
782 * the request is removed from the queue in the interrupt
785 if (request->status == TAPE_REQUEST_DONE)
789 * We wanted to cancel the request but the common I/O layer
790 * was busy at that time. This can only happen if this
791 * function is called by delayed_next_request.
792 * Otherwise we start the next request on the queue.
794 if (request->status == TAPE_REQUEST_CANCEL) {
795 rc = __tape_cancel_io(device, request);
797 rc = __tape_start_io(device, request);
802 /* Set ending status. */
804 request->status = TAPE_REQUEST_DONE;
806 /* Remove from request queue. */
807 list_del(&request->list);
810 if (request->callback != NULL)
811 request->callback(request, request->callback_data);
816 tape_delayed_next_request(struct work_struct *work)
818 struct tape_device *device =
819 container_of(work, struct tape_device, tape_dnr.work);
821 DBF_LH(6, "tape_delayed_next_request(%p)\n", device);
822 spin_lock_irq(get_ccwdev_lock(device->cdev));
823 __tape_start_next_request(device);
824 spin_unlock_irq(get_ccwdev_lock(device->cdev));
827 static void tape_long_busy_timeout(unsigned long data)
829 struct tape_request *request;
830 struct tape_device *device;
832 device = (struct tape_device *) data;
833 spin_lock_irq(get_ccwdev_lock(device->cdev));
834 request = list_entry(device->req_queue.next, struct tape_request, list);
835 BUG_ON(request->status != TAPE_REQUEST_LONG_BUSY);
836 DBF_LH(6, "%08x: Long busy timeout.\n", device->cdev_id);
837 __tape_start_next_request(device);
838 device->lb_timeout.data = 0UL;
839 tape_put_device(device);
840 spin_unlock_irq(get_ccwdev_lock(device->cdev));
845 struct tape_device * device,
846 struct tape_request * request,
849 DBF_LH(6, "__tape_end_request(%p, %p, %i)\n", device, request, rc);
852 request->status = TAPE_REQUEST_DONE;
854 /* Remove from request queue. */
855 list_del(&request->list);
858 if (request->callback != NULL)
859 request->callback(request, request->callback_data);
862 /* Start next request. */
863 if (!list_empty(&device->req_queue))
864 __tape_start_next_request(device);
868 * Write sense data to dbf
871 tape_dump_sense_dbf(struct tape_device *device, struct tape_request *request,
878 op = tape_op_verbose[request->op];
881 DBF_EVENT(3, "DSTAT : %02x CSTAT: %02x\n",
882 irb->scsw.cmd.dstat, irb->scsw.cmd.cstat);
883 DBF_EVENT(3, "DEVICE: %08x OP\t: %s\n", device->cdev_id, op);
884 sptr = (unsigned int *) irb->ecw;
885 DBF_EVENT(3, "%08x %08x\n", sptr[0], sptr[1]);
886 DBF_EVENT(3, "%08x %08x\n", sptr[2], sptr[3]);
887 DBF_EVENT(3, "%08x %08x\n", sptr[4], sptr[5]);
888 DBF_EVENT(3, "%08x %08x\n", sptr[6], sptr[7]);
892 * I/O helper function. Adds the request to the request queue
893 * and starts it if the tape is idle. Has to be called with
894 * the device lock held.
897 __tape_start_request(struct tape_device *device, struct tape_request *request)
901 switch (request->op) {
907 if (device->tape_state == TS_INIT)
909 if (device->tape_state == TS_UNUSED)
912 if (device->tape_state == TS_BLKUSE)
914 if (device->tape_state != TS_IN_USE)
918 /* Increase use count of device for the added request. */
919 request->device = tape_get_device(device);
921 if (list_empty(&device->req_queue)) {
922 /* No other requests are on the queue. Start this one. */
923 rc = __tape_start_io(device, request);
927 DBF_LH(5, "Request %p added for execution.\n", request);
928 list_add(&request->list, &device->req_queue);
930 DBF_LH(5, "Request %p add to queue.\n", request);
931 request->status = TAPE_REQUEST_QUEUED;
932 list_add_tail(&request->list, &device->req_queue);
938 * Add the request to the request queue, try to start it if the
939 * tape is idle. Return without waiting for end of i/o.
942 tape_do_io_async(struct tape_device *device, struct tape_request *request)
946 DBF_LH(6, "tape_do_io_async(%p, %p)\n", device, request);
948 spin_lock_irq(get_ccwdev_lock(device->cdev));
949 /* Add request to request queue and try to start it. */
950 rc = __tape_start_request(device, request);
951 spin_unlock_irq(get_ccwdev_lock(device->cdev));
956 * tape_do_io/__tape_wake_up
957 * Add the request to the request queue, try to start it if the
958 * tape is idle and wait uninterruptible for its completion.
961 __tape_wake_up(struct tape_request *request, void *data)
963 request->callback = NULL;
964 wake_up((wait_queue_head_t *) data);
968 tape_do_io(struct tape_device *device, struct tape_request *request)
972 spin_lock_irq(get_ccwdev_lock(device->cdev));
974 request->callback = __tape_wake_up;
975 request->callback_data = &device->wait_queue;
976 /* Add request to request queue and try to start it. */
977 rc = __tape_start_request(device, request);
978 spin_unlock_irq(get_ccwdev_lock(device->cdev));
981 /* Request added to the queue. Wait for its completion. */
982 wait_event(device->wait_queue, (request->callback == NULL));
983 /* Get rc from request */
988 * tape_do_io_interruptible/__tape_wake_up_interruptible
989 * Add the request to the request queue, try to start it if the
990 * tape is idle and wait uninterruptible for its completion.
993 __tape_wake_up_interruptible(struct tape_request *request, void *data)
995 request->callback = NULL;
996 wake_up_interruptible((wait_queue_head_t *) data);
1000 tape_do_io_interruptible(struct tape_device *device,
1001 struct tape_request *request)
1005 spin_lock_irq(get_ccwdev_lock(device->cdev));
1006 /* Setup callback */
1007 request->callback = __tape_wake_up_interruptible;
1008 request->callback_data = &device->wait_queue;
1009 rc = __tape_start_request(device, request);
1010 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1013 /* Request added to the queue. Wait for its completion. */
1014 rc = wait_event_interruptible(device->wait_queue,
1015 (request->callback == NULL));
1016 if (rc != -ERESTARTSYS)
1017 /* Request finished normally. */
1020 /* Interrupted by a signal. We have to stop the current request. */
1021 spin_lock_irq(get_ccwdev_lock(device->cdev));
1022 rc = __tape_cancel_io(device, request);
1023 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1025 /* Wait for the interrupt that acknowledges the halt. */
1027 rc = wait_event_interruptible(
1029 (request->callback == NULL)
1031 } while (rc == -ERESTARTSYS);
1033 DBF_EVENT(3, "IO stopped on %08x\n", device->cdev_id);
1043 tape_cancel_io(struct tape_device *device, struct tape_request *request)
1047 spin_lock_irq(get_ccwdev_lock(device->cdev));
1048 rc = __tape_cancel_io(device, request);
1049 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1054 * Tape interrupt routine, called from the ccw_device layer
1057 __tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1059 struct tape_device *device;
1060 struct tape_request *request;
1063 device = dev_get_drvdata(&cdev->dev);
1064 if (device == NULL) {
1067 request = (struct tape_request *) intparm;
1069 DBF_LH(6, "__tape_do_irq(device=%p, request=%p)\n", device, request);
1071 /* On special conditions irb is an error pointer */
1073 /* FIXME: What to do with the request? */
1074 switch (PTR_ERR(irb)) {
1076 DBF_LH(1, "(%s): Request timed out\n",
1077 dev_name(&cdev->dev));
1079 __tape_end_request(device, request, -EIO);
1082 DBF_LH(1, "(%s): Unexpected i/o error %li\n",
1083 dev_name(&cdev->dev),
1090 * If the condition code is not zero and the start function bit is
1091 * still set, this is an deferred error and the last start I/O did
1092 * not succeed. At this point the condition that caused the deferred
1093 * error might still apply. So we just schedule the request to be
1096 if (irb->scsw.cmd.cc != 0 &&
1097 (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1098 (request->status == TAPE_REQUEST_IN_IO)) {
1099 DBF_EVENT(3,"(%08x): deferred cc=%i, fctl=%i. restarting\n",
1100 device->cdev_id, irb->scsw.cmd.cc, irb->scsw.cmd.fctl);
1101 request->status = TAPE_REQUEST_QUEUED;
1102 schedule_delayed_work(&device->tape_dnr, HZ);
1106 /* May be an unsolicited irq */
1108 request->rescnt = irb->scsw.cmd.count;
1109 else if ((irb->scsw.cmd.dstat == 0x85 || irb->scsw.cmd.dstat == 0x80) &&
1110 !list_empty(&device->req_queue)) {
1111 /* Not Ready to Ready after long busy ? */
1112 struct tape_request *req;
1113 req = list_entry(device->req_queue.next,
1114 struct tape_request, list);
1115 if (req->status == TAPE_REQUEST_LONG_BUSY) {
1116 DBF_EVENT(3, "(%08x): del timer\n", device->cdev_id);
1117 if (del_timer(&device->lb_timeout)) {
1118 device->lb_timeout.data = 0UL;
1119 tape_put_device(device);
1120 __tape_start_next_request(device);
1125 if (irb->scsw.cmd.dstat != 0x0c) {
1126 /* Set the 'ONLINE' flag depending on sense byte 1 */
1127 if(*(((__u8 *) irb->ecw) + 1) & SENSE_DRIVE_ONLINE)
1128 device->tape_generic_status |= GMT_ONLINE(~0);
1130 device->tape_generic_status &= ~GMT_ONLINE(~0);
1133 * Any request that does not come back with channel end
1134 * and device end is unusual. Log the sense data.
1136 DBF_EVENT(3,"-- Tape Interrupthandler --\n");
1137 tape_dump_sense_dbf(device, request, irb);
1139 /* Upon normal completion the device _is_ online */
1140 device->tape_generic_status |= GMT_ONLINE(~0);
1142 if (device->tape_state == TS_NOT_OPER) {
1143 DBF_EVENT(6, "tape:device is not operational\n");
1148 * Request that were canceled still come back with an interrupt.
1149 * To detect these request the state will be set to TAPE_REQUEST_DONE.
1151 if(request != NULL && request->status == TAPE_REQUEST_DONE) {
1152 __tape_end_request(device, request, -EIO);
1156 rc = device->discipline->irq(device, request, irb);
1158 * rc < 0 : request finished unsuccessfully.
1159 * rc == TAPE_IO_SUCCESS: request finished successfully.
1160 * rc == TAPE_IO_PENDING: request is still running. Ignore rc.
1161 * rc == TAPE_IO_RETRY: request finished but needs another go.
1162 * rc == TAPE_IO_STOP: request needs to get terminated.
1165 case TAPE_IO_SUCCESS:
1166 /* Upon normal completion the device _is_ online */
1167 device->tape_generic_status |= GMT_ONLINE(~0);
1168 __tape_end_request(device, request, rc);
1170 case TAPE_IO_PENDING:
1172 case TAPE_IO_LONG_BUSY:
1173 device->lb_timeout.data =
1174 (unsigned long) tape_get_device(device);
1175 device->lb_timeout.expires = jiffies +
1176 LONG_BUSY_TIMEOUT * HZ;
1177 DBF_EVENT(3, "(%08x): add timer\n", device->cdev_id);
1178 add_timer(&device->lb_timeout);
1179 request->status = TAPE_REQUEST_LONG_BUSY;
1182 rc = __tape_start_io(device, request);
1184 __tape_end_request(device, request, rc);
1187 rc = __tape_cancel_io(device, request);
1189 __tape_end_request(device, request, rc);
1193 DBF_EVENT(6, "xunknownrc\n");
1194 __tape_end_request(device, request, -EIO);
1196 __tape_end_request(device, request, rc);
1203 * Tape device open function used by tape_char & tape_block frontends.
1206 tape_open(struct tape_device *device)
1210 spin_lock_irq(get_ccwdev_lock(device->cdev));
1211 if (device->tape_state == TS_NOT_OPER) {
1212 DBF_EVENT(6, "TAPE:nodev\n");
1214 } else if (device->tape_state == TS_IN_USE) {
1215 DBF_EVENT(6, "TAPE:dbusy\n");
1217 } else if (device->tape_state == TS_BLKUSE) {
1218 DBF_EVENT(6, "TAPE:dbusy\n");
1220 } else if (device->discipline != NULL &&
1221 !try_module_get(device->discipline->owner)) {
1222 DBF_EVENT(6, "TAPE:nodisc\n");
1225 tape_state_set(device, TS_IN_USE);
1228 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1233 * Tape device release function used by tape_char & tape_block frontends.
1236 tape_release(struct tape_device *device)
1238 spin_lock_irq(get_ccwdev_lock(device->cdev));
1239 if (device->tape_state == TS_IN_USE)
1240 tape_state_set(device, TS_UNUSED);
1241 module_put(device->discipline->owner);
1242 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1247 * Execute a magnetic tape command a number of times.
1250 tape_mtop(struct tape_device *device, int mt_op, int mt_count)
1255 DBF_EVENT(6, "TAPE:mtio\n");
1256 DBF_EVENT(6, "TAPE:ioop: %x\n", mt_op);
1257 DBF_EVENT(6, "TAPE:arg: %x\n", mt_count);
1259 if (mt_op < 0 || mt_op >= TAPE_NR_MTOPS)
1261 fn = device->discipline->mtop_array[mt_op];
1265 /* We assume that the backends can handle count up to 500. */
1266 if (mt_op == MTBSR || mt_op == MTFSR || mt_op == MTFSF ||
1267 mt_op == MTBSF || mt_op == MTFSFM || mt_op == MTBSFM) {
1269 for (; mt_count > 500; mt_count -= 500)
1270 if ((rc = fn(device, 500)) != 0)
1273 rc = fn(device, mt_count);
1275 rc = fn(device, mt_count);
1281 * Tape init function.
1286 TAPE_DBF_AREA = debug_register ( "tape", 2, 2, 4*sizeof(long));
1287 debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view);
1288 #ifdef DBF_LIKE_HELL
1289 debug_set_level(TAPE_DBF_AREA, 6);
1291 DBF_EVENT(3, "tape init\n");
1299 * Tape exit function.
1304 DBF_EVENT(6, "tape exit\n");
1306 /* Get rid of the frontends */
1309 tape_proc_cleanup();
1310 debug_unregister (TAPE_DBF_AREA);
1313 MODULE_AUTHOR("(C) 2001 IBM Deutschland Entwicklung GmbH by Carsten Otte and "
1314 "Michael Holzheu (cotte@de.ibm.com,holzheu@de.ibm.com)");
1315 MODULE_DESCRIPTION("Linux on zSeries channel attached tape device driver");
1316 MODULE_LICENSE("GPL");
1318 module_init(tape_init);
1319 module_exit(tape_exit);
1321 EXPORT_SYMBOL(tape_generic_remove);
1322 EXPORT_SYMBOL(tape_generic_probe);
1323 EXPORT_SYMBOL(tape_generic_online);
1324 EXPORT_SYMBOL(tape_generic_offline);
1325 EXPORT_SYMBOL(tape_generic_pm_suspend);
1326 EXPORT_SYMBOL(tape_put_device);
1327 EXPORT_SYMBOL(tape_get_device);
1328 EXPORT_SYMBOL(tape_state_verbose);
1329 EXPORT_SYMBOL(tape_op_verbose);
1330 EXPORT_SYMBOL(tape_state_set);
1331 EXPORT_SYMBOL(tape_med_state_set);
1332 EXPORT_SYMBOL(tape_alloc_request);
1333 EXPORT_SYMBOL(tape_free_request);
1334 EXPORT_SYMBOL(tape_dump_sense_dbf);
1335 EXPORT_SYMBOL(tape_do_io);
1336 EXPORT_SYMBOL(tape_do_io_async);
1337 EXPORT_SYMBOL(tape_do_io_interruptible);
1338 EXPORT_SYMBOL(tape_cancel_io);
1339 EXPORT_SYMBOL(tape_mtop);