2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Horst Hummel <Horst.Hummel@de.ibm.com>
4 * Carsten Otte <Cotte@de.ibm.com>
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
7 * Copyright IBM Corp. 1999, 2009
10 #define KMSG_COMPONENT "dasd"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13 #include <linux/kmod.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/ctype.h>
17 #include <linux/major.h>
18 #include <linux/slab.h>
19 #include <linux/hdreg.h>
20 #include <linux/async.h>
21 #include <linux/mutex.h>
22 #include <linux/debugfs.h>
23 #include <linux/seq_file.h>
24 #include <linux/vmalloc.h>
26 #include <asm/ccwdev.h>
27 #include <asm/ebcdic.h>
28 #include <asm/idals.h>
33 #define PRINTK_HEADER "dasd:"
37 * SECTION: Constant definitions to be used within this file
39 #define DASD_CHANQ_MAX_SIZE 4
41 #define DASD_DIAG_MOD "dasd_diag_mod"
44 * SECTION: exported variables of dasd.c
46 debug_info_t *dasd_debug_area;
47 EXPORT_SYMBOL(dasd_debug_area);
48 static struct dentry *dasd_debugfs_root_entry;
49 struct dasd_discipline *dasd_diag_discipline_pointer;
50 EXPORT_SYMBOL(dasd_diag_discipline_pointer);
51 void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
53 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
54 MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
55 " Copyright IBM Corp. 2000");
56 MODULE_SUPPORTED_DEVICE("dasd");
57 MODULE_LICENSE("GPL");
60 * SECTION: prototypes for static functions of dasd.c
62 static int dasd_alloc_queue(struct dasd_block *);
63 static void dasd_setup_queue(struct dasd_block *);
64 static void dasd_free_queue(struct dasd_block *);
65 static void dasd_flush_request_queue(struct dasd_block *);
66 static int dasd_flush_block_queue(struct dasd_block *);
67 static void dasd_device_tasklet(struct dasd_device *);
68 static void dasd_block_tasklet(struct dasd_block *);
69 static void do_kick_device(struct work_struct *);
70 static void do_restore_device(struct work_struct *);
71 static void do_reload_device(struct work_struct *);
72 static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
73 static void dasd_device_timeout(unsigned long);
74 static void dasd_block_timeout(unsigned long);
75 static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *);
76 static void dasd_profile_init(struct dasd_profile *, struct dentry *);
77 static void dasd_profile_exit(struct dasd_profile *);
78 static void dasd_hosts_init(struct dentry *, struct dasd_device *);
79 static void dasd_hosts_exit(struct dasd_device *);
82 * SECTION: Operations on the device structure.
84 static wait_queue_head_t dasd_init_waitq;
85 static wait_queue_head_t dasd_flush_wq;
86 static wait_queue_head_t generic_waitq;
87 static wait_queue_head_t shutdown_waitq;
90 * Allocate memory for a new device structure.
92 struct dasd_device *dasd_alloc_device(void)
94 struct dasd_device *device;
96 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC);
98 return ERR_PTR(-ENOMEM);
100 /* Get two pages for normal block device operations. */
101 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
102 if (!device->ccw_mem) {
104 return ERR_PTR(-ENOMEM);
106 /* Get one page for error recovery. */
107 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
108 if (!device->erp_mem) {
109 free_pages((unsigned long) device->ccw_mem, 1);
111 return ERR_PTR(-ENOMEM);
114 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
115 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
116 spin_lock_init(&device->mem_lock);
117 atomic_set(&device->tasklet_scheduled, 0);
118 tasklet_init(&device->tasklet,
119 (void (*)(unsigned long)) dasd_device_tasklet,
120 (unsigned long) device);
121 INIT_LIST_HEAD(&device->ccw_queue);
122 init_timer(&device->timer);
123 device->timer.function = dasd_device_timeout;
124 device->timer.data = (unsigned long) device;
125 INIT_WORK(&device->kick_work, do_kick_device);
126 INIT_WORK(&device->restore_device, do_restore_device);
127 INIT_WORK(&device->reload_device, do_reload_device);
128 device->state = DASD_STATE_NEW;
129 device->target = DASD_STATE_NEW;
130 mutex_init(&device->state_mutex);
131 spin_lock_init(&device->profile.lock);
136 * Free memory of a device structure.
138 void dasd_free_device(struct dasd_device *device)
140 kfree(device->private);
141 free_page((unsigned long) device->erp_mem);
142 free_pages((unsigned long) device->ccw_mem, 1);
147 * Allocate memory for a new device structure.
149 struct dasd_block *dasd_alloc_block(void)
151 struct dasd_block *block;
153 block = kzalloc(sizeof(*block), GFP_ATOMIC);
155 return ERR_PTR(-ENOMEM);
156 /* open_count = 0 means device online but not in use */
157 atomic_set(&block->open_count, -1);
159 spin_lock_init(&block->request_queue_lock);
160 atomic_set(&block->tasklet_scheduled, 0);
161 tasklet_init(&block->tasklet,
162 (void (*)(unsigned long)) dasd_block_tasklet,
163 (unsigned long) block);
164 INIT_LIST_HEAD(&block->ccw_queue);
165 spin_lock_init(&block->queue_lock);
166 init_timer(&block->timer);
167 block->timer.function = dasd_block_timeout;
168 block->timer.data = (unsigned long) block;
169 spin_lock_init(&block->profile.lock);
173 EXPORT_SYMBOL_GPL(dasd_alloc_block);
176 * Free memory of a device structure.
178 void dasd_free_block(struct dasd_block *block)
182 EXPORT_SYMBOL_GPL(dasd_free_block);
185 * Make a new device known to the system.
187 static int dasd_state_new_to_known(struct dasd_device *device)
192 * As long as the device is not in state DASD_STATE_NEW we want to
193 * keep the reference count > 0.
195 dasd_get_device(device);
198 rc = dasd_alloc_queue(device->block);
200 dasd_put_device(device);
204 device->state = DASD_STATE_KNOWN;
209 * Let the system forget about a device.
211 static int dasd_state_known_to_new(struct dasd_device *device)
213 /* Disable extended error reporting for this device. */
214 dasd_eer_disable(device);
215 /* Forget the discipline information. */
216 if (device->discipline) {
217 if (device->discipline->uncheck_device)
218 device->discipline->uncheck_device(device);
219 module_put(device->discipline->owner);
221 device->discipline = NULL;
222 if (device->base_discipline)
223 module_put(device->base_discipline->owner);
224 device->base_discipline = NULL;
225 device->state = DASD_STATE_NEW;
228 dasd_free_queue(device->block);
230 /* Give up reference we took in dasd_state_new_to_known. */
231 dasd_put_device(device);
235 static struct dentry *dasd_debugfs_setup(const char *name,
236 struct dentry *base_dentry)
242 pde = debugfs_create_dir(name, base_dentry);
243 if (!pde || IS_ERR(pde))
249 * Request the irq line for the device.
251 static int dasd_state_known_to_basic(struct dasd_device *device)
253 struct dasd_block *block = device->block;
256 /* Allocate and register gendisk structure. */
258 rc = dasd_gendisk_alloc(block);
261 block->debugfs_dentry =
262 dasd_debugfs_setup(block->gdp->disk_name,
263 dasd_debugfs_root_entry);
264 dasd_profile_init(&block->profile, block->debugfs_dentry);
265 if (dasd_global_profile_level == DASD_PROFILE_ON)
266 dasd_profile_on(&device->block->profile);
268 device->debugfs_dentry =
269 dasd_debugfs_setup(dev_name(&device->cdev->dev),
270 dasd_debugfs_root_entry);
271 dasd_profile_init(&device->profile, device->debugfs_dentry);
272 dasd_hosts_init(device->debugfs_dentry, device);
274 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
275 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1,
277 debug_register_view(device->debug_area, &debug_sprintf_view);
278 debug_set_level(device->debug_area, DBF_WARNING);
279 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
281 device->state = DASD_STATE_BASIC;
287 * Release the irq line for the device. Terminate any running i/o.
289 static int dasd_state_basic_to_known(struct dasd_device *device)
293 if (device->discipline->basic_to_known) {
294 rc = device->discipline->basic_to_known(device);
300 dasd_profile_exit(&device->block->profile);
301 debugfs_remove(device->block->debugfs_dentry);
302 dasd_gendisk_free(device->block);
303 dasd_block_clear_timer(device->block);
305 rc = dasd_flush_device_queue(device);
308 dasd_device_clear_timer(device);
309 dasd_profile_exit(&device->profile);
310 dasd_hosts_exit(device);
311 debugfs_remove(device->debugfs_dentry);
312 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
313 if (device->debug_area != NULL) {
314 debug_unregister(device->debug_area);
315 device->debug_area = NULL;
317 device->state = DASD_STATE_KNOWN;
322 * Do the initial analysis. The do_analysis function may return
323 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
324 * until the discipline decides to continue the startup sequence
325 * by calling the function dasd_change_state. The eckd disciplines
326 * uses this to start a ccw that detects the format. The completion
327 * interrupt for this detection ccw uses the kernel event daemon to
328 * trigger the call to dasd_change_state. All this is done in the
329 * discipline code, see dasd_eckd.c.
330 * After the analysis ccw is done (do_analysis returned 0) the block
332 * In case the analysis returns an error, the device setup is stopped
333 * (a fake disk was already added to allow formatting).
335 static int dasd_state_basic_to_ready(struct dasd_device *device)
338 struct dasd_block *block;
341 block = device->block;
342 /* make disk known with correct capacity */
344 if (block->base->discipline->do_analysis != NULL)
345 rc = block->base->discipline->do_analysis(block);
348 device->state = DASD_STATE_UNFMT;
353 dasd_setup_queue(block);
354 set_capacity(block->gdp,
355 block->blocks << block->s2b_shift);
356 device->state = DASD_STATE_READY;
357 rc = dasd_scan_partitions(block);
359 device->state = DASD_STATE_BASIC;
363 device->state = DASD_STATE_READY;
366 if (device->discipline->basic_to_ready)
367 rc = device->discipline->basic_to_ready(device);
372 int _wait_for_empty_queues(struct dasd_device *device)
375 return list_empty(&device->ccw_queue) &&
376 list_empty(&device->block->ccw_queue);
378 return list_empty(&device->ccw_queue);
382 * Remove device from block device layer. Destroy dirty buffers.
383 * Forget format information. Check if the target level is basic
384 * and if it is create fake disk for formatting.
386 static int dasd_state_ready_to_basic(struct dasd_device *device)
390 device->state = DASD_STATE_BASIC;
392 struct dasd_block *block = device->block;
393 rc = dasd_flush_block_queue(block);
395 device->state = DASD_STATE_READY;
398 dasd_flush_request_queue(block);
399 dasd_destroy_partitions(block);
402 block->s2b_shift = 0;
410 static int dasd_state_unfmt_to_basic(struct dasd_device *device)
412 device->state = DASD_STATE_BASIC;
417 * Make the device online and schedule the bottom half to start
418 * the requeueing of requests from the linux request queue to the
422 dasd_state_ready_to_online(struct dasd_device * device)
424 struct gendisk *disk;
425 struct disk_part_iter piter;
426 struct hd_struct *part;
428 device->state = DASD_STATE_ONLINE;
430 dasd_schedule_block_bh(device->block);
431 if ((device->features & DASD_FEATURE_USERAW)) {
432 disk = device->block->gdp;
433 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
436 disk = device->block->bdev->bd_disk;
437 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
438 while ((part = disk_part_iter_next(&piter)))
439 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
440 disk_part_iter_exit(&piter);
446 * Stop the requeueing of requests again.
448 static int dasd_state_online_to_ready(struct dasd_device *device)
451 struct gendisk *disk;
452 struct disk_part_iter piter;
453 struct hd_struct *part;
455 if (device->discipline->online_to_ready) {
456 rc = device->discipline->online_to_ready(device);
461 device->state = DASD_STATE_READY;
462 if (device->block && !(device->features & DASD_FEATURE_USERAW)) {
463 disk = device->block->bdev->bd_disk;
464 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
465 while ((part = disk_part_iter_next(&piter)))
466 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
467 disk_part_iter_exit(&piter);
473 * Device startup state changes.
475 static int dasd_increase_state(struct dasd_device *device)
480 if (device->state == DASD_STATE_NEW &&
481 device->target >= DASD_STATE_KNOWN)
482 rc = dasd_state_new_to_known(device);
485 device->state == DASD_STATE_KNOWN &&
486 device->target >= DASD_STATE_BASIC)
487 rc = dasd_state_known_to_basic(device);
490 device->state == DASD_STATE_BASIC &&
491 device->target >= DASD_STATE_READY)
492 rc = dasd_state_basic_to_ready(device);
495 device->state == DASD_STATE_UNFMT &&
496 device->target > DASD_STATE_UNFMT)
500 device->state == DASD_STATE_READY &&
501 device->target >= DASD_STATE_ONLINE)
502 rc = dasd_state_ready_to_online(device);
508 * Device shutdown state changes.
510 static int dasd_decrease_state(struct dasd_device *device)
515 if (device->state == DASD_STATE_ONLINE &&
516 device->target <= DASD_STATE_READY)
517 rc = dasd_state_online_to_ready(device);
520 device->state == DASD_STATE_READY &&
521 device->target <= DASD_STATE_BASIC)
522 rc = dasd_state_ready_to_basic(device);
525 device->state == DASD_STATE_UNFMT &&
526 device->target <= DASD_STATE_BASIC)
527 rc = dasd_state_unfmt_to_basic(device);
530 device->state == DASD_STATE_BASIC &&
531 device->target <= DASD_STATE_KNOWN)
532 rc = dasd_state_basic_to_known(device);
535 device->state == DASD_STATE_KNOWN &&
536 device->target <= DASD_STATE_NEW)
537 rc = dasd_state_known_to_new(device);
543 * This is the main startup/shutdown routine.
545 static void dasd_change_state(struct dasd_device *device)
549 if (device->state == device->target)
550 /* Already where we want to go today... */
552 if (device->state < device->target)
553 rc = dasd_increase_state(device);
555 rc = dasd_decrease_state(device);
559 device->target = device->state;
561 /* let user-space know that the device status changed */
562 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
564 if (device->state == device->target)
565 wake_up(&dasd_init_waitq);
569 * Kick starter for devices that did not complete the startup/shutdown
570 * procedure or were sleeping because of a pending state.
571 * dasd_kick_device will schedule a call do do_kick_device to the kernel
574 static void do_kick_device(struct work_struct *work)
576 struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
577 mutex_lock(&device->state_mutex);
578 dasd_change_state(device);
579 mutex_unlock(&device->state_mutex);
580 dasd_schedule_device_bh(device);
581 dasd_put_device(device);
584 void dasd_kick_device(struct dasd_device *device)
586 dasd_get_device(device);
587 /* queue call to dasd_kick_device to the kernel event daemon. */
588 if (!schedule_work(&device->kick_work))
589 dasd_put_device(device);
591 EXPORT_SYMBOL(dasd_kick_device);
594 * dasd_reload_device will schedule a call do do_reload_device to the kernel
597 static void do_reload_device(struct work_struct *work)
599 struct dasd_device *device = container_of(work, struct dasd_device,
601 device->discipline->reload(device);
602 dasd_put_device(device);
605 void dasd_reload_device(struct dasd_device *device)
607 dasd_get_device(device);
608 /* queue call to dasd_reload_device to the kernel event daemon. */
609 if (!schedule_work(&device->reload_device))
610 dasd_put_device(device);
612 EXPORT_SYMBOL(dasd_reload_device);
615 * dasd_restore_device will schedule a call do do_restore_device to the kernel
618 static void do_restore_device(struct work_struct *work)
620 struct dasd_device *device = container_of(work, struct dasd_device,
622 device->cdev->drv->restore(device->cdev);
623 dasd_put_device(device);
626 void dasd_restore_device(struct dasd_device *device)
628 dasd_get_device(device);
629 /* queue call to dasd_restore_device to the kernel event daemon. */
630 if (!schedule_work(&device->restore_device))
631 dasd_put_device(device);
635 * Set the target state for a device and starts the state change.
637 void dasd_set_target_state(struct dasd_device *device, int target)
639 dasd_get_device(device);
640 mutex_lock(&device->state_mutex);
641 /* If we are in probeonly mode stop at DASD_STATE_READY. */
642 if (dasd_probeonly && target > DASD_STATE_READY)
643 target = DASD_STATE_READY;
644 if (device->target != target) {
645 if (device->state == target)
646 wake_up(&dasd_init_waitq);
647 device->target = target;
649 if (device->state != device->target)
650 dasd_change_state(device);
651 mutex_unlock(&device->state_mutex);
652 dasd_put_device(device);
654 EXPORT_SYMBOL(dasd_set_target_state);
657 * Enable devices with device numbers in [from..to].
659 static inline int _wait_for_device(struct dasd_device *device)
661 return (device->state == device->target);
664 void dasd_enable_device(struct dasd_device *device)
666 dasd_set_target_state(device, DASD_STATE_ONLINE);
667 if (device->state <= DASD_STATE_KNOWN)
668 /* No discipline for device found. */
669 dasd_set_target_state(device, DASD_STATE_NEW);
670 /* Now wait for the devices to come up. */
671 wait_event(dasd_init_waitq, _wait_for_device(device));
673 dasd_reload_device(device);
674 if (device->discipline->kick_validate)
675 device->discipline->kick_validate(device);
677 EXPORT_SYMBOL(dasd_enable_device);
680 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
683 unsigned int dasd_global_profile_level = DASD_PROFILE_OFF;
685 #ifdef CONFIG_DASD_PROFILE
686 struct dasd_profile dasd_global_profile = {
687 .lock = __SPIN_LOCK_UNLOCKED(dasd_global_profile.lock),
689 static struct dentry *dasd_debugfs_global_entry;
692 * Add profiling information for cqr before execution.
694 static void dasd_profile_start(struct dasd_block *block,
695 struct dasd_ccw_req *cqr,
699 unsigned int counter;
700 struct dasd_device *device;
702 /* count the length of the chanq for statistics */
704 if (dasd_global_profile_level || block->profile.data)
705 list_for_each(l, &block->ccw_queue)
709 spin_lock(&dasd_global_profile.lock);
710 if (dasd_global_profile.data) {
711 dasd_global_profile.data->dasd_io_nr_req[counter]++;
712 if (rq_data_dir(req) == READ)
713 dasd_global_profile.data->dasd_read_nr_req[counter]++;
715 spin_unlock(&dasd_global_profile.lock);
717 spin_lock(&block->profile.lock);
718 if (block->profile.data) {
719 block->profile.data->dasd_io_nr_req[counter]++;
720 if (rq_data_dir(req) == READ)
721 block->profile.data->dasd_read_nr_req[counter]++;
723 spin_unlock(&block->profile.lock);
726 * We count the request for the start device, even though it may run on
727 * some other device due to error recovery. This way we make sure that
728 * we count each request only once.
730 device = cqr->startdev;
731 if (device->profile.data) {
732 counter = 1; /* request is not yet queued on the start device */
733 list_for_each(l, &device->ccw_queue)
737 spin_lock(&device->profile.lock);
738 if (device->profile.data) {
739 device->profile.data->dasd_io_nr_req[counter]++;
740 if (rq_data_dir(req) == READ)
741 device->profile.data->dasd_read_nr_req[counter]++;
743 spin_unlock(&device->profile.lock);
747 * Add profiling information for cqr after execution.
750 #define dasd_profile_counter(value, index) \
752 for (index = 0; index < 31 && value >> (2+index); index++) \
756 static void dasd_profile_end_add_data(struct dasd_profile_info *data,
769 /* in case of an overflow, reset the whole profile */
770 if (data->dasd_io_reqs == UINT_MAX) {
771 memset(data, 0, sizeof(*data));
772 getnstimeofday(&data->starttod);
774 data->dasd_io_reqs++;
775 data->dasd_io_sects += sectors;
777 data->dasd_io_alias++;
781 data->dasd_io_secs[sectors_ind]++;
782 data->dasd_io_times[tottime_ind]++;
783 data->dasd_io_timps[tottimeps_ind]++;
784 data->dasd_io_time1[strtime_ind]++;
785 data->dasd_io_time2[irqtime_ind]++;
786 data->dasd_io_time2ps[irqtimeps_ind]++;
787 data->dasd_io_time3[endtime_ind]++;
790 data->dasd_read_reqs++;
791 data->dasd_read_sects += sectors;
793 data->dasd_read_alias++;
795 data->dasd_read_tpm++;
796 data->dasd_read_secs[sectors_ind]++;
797 data->dasd_read_times[tottime_ind]++;
798 data->dasd_read_time1[strtime_ind]++;
799 data->dasd_read_time2[irqtime_ind]++;
800 data->dasd_read_time3[endtime_ind]++;
804 static void dasd_profile_end(struct dasd_block *block,
805 struct dasd_ccw_req *cqr,
808 long strtime, irqtime, endtime, tottime; /* in microseconds */
809 long tottimeps, sectors;
810 struct dasd_device *device;
811 int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind;
812 int irqtime_ind, irqtimeps_ind, endtime_ind;
814 device = cqr->startdev;
815 if (!(dasd_global_profile_level ||
816 block->profile.data ||
817 device->profile.data))
820 sectors = blk_rq_sectors(req);
821 if (!cqr->buildclk || !cqr->startclk ||
822 !cqr->stopclk || !cqr->endclk ||
826 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
827 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
828 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
829 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
830 tottimeps = tottime / sectors;
832 dasd_profile_counter(sectors, sectors_ind);
833 dasd_profile_counter(tottime, tottime_ind);
834 dasd_profile_counter(tottimeps, tottimeps_ind);
835 dasd_profile_counter(strtime, strtime_ind);
836 dasd_profile_counter(irqtime, irqtime_ind);
837 dasd_profile_counter(irqtime / sectors, irqtimeps_ind);
838 dasd_profile_counter(endtime, endtime_ind);
840 spin_lock(&dasd_global_profile.lock);
841 if (dasd_global_profile.data) {
842 dasd_profile_end_add_data(dasd_global_profile.data,
843 cqr->startdev != block->base,
845 rq_data_dir(req) == READ,
846 sectors, sectors_ind, tottime_ind,
847 tottimeps_ind, strtime_ind,
848 irqtime_ind, irqtimeps_ind,
851 spin_unlock(&dasd_global_profile.lock);
853 spin_lock(&block->profile.lock);
854 if (block->profile.data)
855 dasd_profile_end_add_data(block->profile.data,
856 cqr->startdev != block->base,
858 rq_data_dir(req) == READ,
859 sectors, sectors_ind, tottime_ind,
860 tottimeps_ind, strtime_ind,
861 irqtime_ind, irqtimeps_ind,
863 spin_unlock(&block->profile.lock);
865 spin_lock(&device->profile.lock);
866 if (device->profile.data)
867 dasd_profile_end_add_data(device->profile.data,
868 cqr->startdev != block->base,
870 rq_data_dir(req) == READ,
871 sectors, sectors_ind, tottime_ind,
872 tottimeps_ind, strtime_ind,
873 irqtime_ind, irqtimeps_ind,
875 spin_unlock(&device->profile.lock);
878 void dasd_profile_reset(struct dasd_profile *profile)
880 struct dasd_profile_info *data;
882 spin_lock_bh(&profile->lock);
883 data = profile->data;
885 spin_unlock_bh(&profile->lock);
888 memset(data, 0, sizeof(*data));
889 getnstimeofday(&data->starttod);
890 spin_unlock_bh(&profile->lock);
893 int dasd_profile_on(struct dasd_profile *profile)
895 struct dasd_profile_info *data;
897 data = kzalloc(sizeof(*data), GFP_KERNEL);
900 spin_lock_bh(&profile->lock);
902 spin_unlock_bh(&profile->lock);
906 getnstimeofday(&data->starttod);
907 profile->data = data;
908 spin_unlock_bh(&profile->lock);
912 void dasd_profile_off(struct dasd_profile *profile)
914 spin_lock_bh(&profile->lock);
915 kfree(profile->data);
916 profile->data = NULL;
917 spin_unlock_bh(&profile->lock);
920 char *dasd_get_user_string(const char __user *user_buf, size_t user_len)
924 buffer = vmalloc(user_len + 1);
926 return ERR_PTR(-ENOMEM);
927 if (copy_from_user(buffer, user_buf, user_len) != 0) {
929 return ERR_PTR(-EFAULT);
931 /* got the string, now strip linefeed. */
932 if (buffer[user_len - 1] == '\n')
933 buffer[user_len - 1] = 0;
935 buffer[user_len] = 0;
939 static ssize_t dasd_stats_write(struct file *file,
940 const char __user *user_buf,
941 size_t user_len, loff_t *pos)
945 struct seq_file *m = (struct seq_file *)file->private_data;
946 struct dasd_profile *prof = m->private;
948 if (user_len > 65536)
950 buffer = dasd_get_user_string(user_buf, user_len);
952 return PTR_ERR(buffer);
954 str = skip_spaces(buffer);
956 if (strncmp(str, "reset", 5) == 0) {
957 dasd_profile_reset(prof);
958 } else if (strncmp(str, "on", 2) == 0) {
959 rc = dasd_profile_on(prof);
963 if (prof == &dasd_global_profile) {
964 dasd_profile_reset(prof);
965 dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY;
967 } else if (strncmp(str, "off", 3) == 0) {
968 if (prof == &dasd_global_profile)
969 dasd_global_profile_level = DASD_PROFILE_OFF;
970 dasd_profile_off(prof);
978 static void dasd_stats_array(struct seq_file *m, unsigned int *array)
982 for (i = 0; i < 32; i++)
983 seq_printf(m, "%u ", array[i]);
987 static void dasd_stats_seq_print(struct seq_file *m,
988 struct dasd_profile_info *data)
990 seq_printf(m, "start_time %ld.%09ld\n",
991 data->starttod.tv_sec, data->starttod.tv_nsec);
992 seq_printf(m, "total_requests %u\n", data->dasd_io_reqs);
993 seq_printf(m, "total_sectors %u\n", data->dasd_io_sects);
994 seq_printf(m, "total_pav %u\n", data->dasd_io_alias);
995 seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm);
996 seq_puts(m, "histogram_sectors ");
997 dasd_stats_array(m, data->dasd_io_secs);
998 seq_puts(m, "histogram_io_times ");
999 dasd_stats_array(m, data->dasd_io_times);
1000 seq_puts(m, "histogram_io_times_weighted ");
1001 dasd_stats_array(m, data->dasd_io_timps);
1002 seq_puts(m, "histogram_time_build_to_ssch ");
1003 dasd_stats_array(m, data->dasd_io_time1);
1004 seq_puts(m, "histogram_time_ssch_to_irq ");
1005 dasd_stats_array(m, data->dasd_io_time2);
1006 seq_puts(m, "histogram_time_ssch_to_irq_weighted ");
1007 dasd_stats_array(m, data->dasd_io_time2ps);
1008 seq_puts(m, "histogram_time_irq_to_end ");
1009 dasd_stats_array(m, data->dasd_io_time3);
1010 seq_puts(m, "histogram_ccw_queue_length ");
1011 dasd_stats_array(m, data->dasd_io_nr_req);
1012 seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs);
1013 seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects);
1014 seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias);
1015 seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm);
1016 seq_puts(m, "histogram_read_sectors ");
1017 dasd_stats_array(m, data->dasd_read_secs);
1018 seq_puts(m, "histogram_read_times ");
1019 dasd_stats_array(m, data->dasd_read_times);
1020 seq_puts(m, "histogram_read_time_build_to_ssch ");
1021 dasd_stats_array(m, data->dasd_read_time1);
1022 seq_puts(m, "histogram_read_time_ssch_to_irq ");
1023 dasd_stats_array(m, data->dasd_read_time2);
1024 seq_puts(m, "histogram_read_time_irq_to_end ");
1025 dasd_stats_array(m, data->dasd_read_time3);
1026 seq_puts(m, "histogram_read_ccw_queue_length ");
1027 dasd_stats_array(m, data->dasd_read_nr_req);
1030 static int dasd_stats_show(struct seq_file *m, void *v)
1032 struct dasd_profile *profile;
1033 struct dasd_profile_info *data;
1035 profile = m->private;
1036 spin_lock_bh(&profile->lock);
1037 data = profile->data;
1039 spin_unlock_bh(&profile->lock);
1040 seq_puts(m, "disabled\n");
1043 dasd_stats_seq_print(m, data);
1044 spin_unlock_bh(&profile->lock);
1048 static int dasd_stats_open(struct inode *inode, struct file *file)
1050 struct dasd_profile *profile = inode->i_private;
1051 return single_open(file, dasd_stats_show, profile);
1054 static const struct file_operations dasd_stats_raw_fops = {
1055 .owner = THIS_MODULE,
1056 .open = dasd_stats_open,
1058 .llseek = seq_lseek,
1059 .release = single_release,
1060 .write = dasd_stats_write,
1063 static void dasd_profile_init(struct dasd_profile *profile,
1064 struct dentry *base_dentry)
1071 profile->dentry = NULL;
1072 profile->data = NULL;
1073 mode = (S_IRUSR | S_IWUSR | S_IFREG);
1074 pde = debugfs_create_file("statistics", mode, base_dentry,
1075 profile, &dasd_stats_raw_fops);
1076 if (pde && !IS_ERR(pde))
1077 profile->dentry = pde;
1081 static void dasd_profile_exit(struct dasd_profile *profile)
1083 dasd_profile_off(profile);
1084 debugfs_remove(profile->dentry);
1085 profile->dentry = NULL;
1088 static void dasd_statistics_removeroot(void)
1090 dasd_global_profile_level = DASD_PROFILE_OFF;
1091 dasd_profile_exit(&dasd_global_profile);
1092 debugfs_remove(dasd_debugfs_global_entry);
1093 debugfs_remove(dasd_debugfs_root_entry);
1096 static void dasd_statistics_createroot(void)
1100 dasd_debugfs_root_entry = NULL;
1101 pde = debugfs_create_dir("dasd", NULL);
1102 if (!pde || IS_ERR(pde))
1104 dasd_debugfs_root_entry = pde;
1105 pde = debugfs_create_dir("global", dasd_debugfs_root_entry);
1106 if (!pde || IS_ERR(pde))
1108 dasd_debugfs_global_entry = pde;
1109 dasd_profile_init(&dasd_global_profile, dasd_debugfs_global_entry);
1113 DBF_EVENT(DBF_ERR, "%s",
1114 "Creation of the dasd debugfs interface failed");
1115 dasd_statistics_removeroot();
1120 #define dasd_profile_start(block, cqr, req) do {} while (0)
1121 #define dasd_profile_end(block, cqr, req) do {} while (0)
1123 static void dasd_statistics_createroot(void)
1128 static void dasd_statistics_removeroot(void)
1133 int dasd_stats_generic_show(struct seq_file *m, void *v)
1135 seq_puts(m, "Statistics are not activated in this kernel\n");
1139 static void dasd_profile_init(struct dasd_profile *profile,
1140 struct dentry *base_dentry)
1145 static void dasd_profile_exit(struct dasd_profile *profile)
1150 int dasd_profile_on(struct dasd_profile *profile)
1155 #endif /* CONFIG_DASD_PROFILE */
1157 static int dasd_hosts_show(struct seq_file *m, void *v)
1159 struct dasd_device *device;
1160 int rc = -EOPNOTSUPP;
1162 device = m->private;
1163 dasd_get_device(device);
1165 if (device->discipline->hosts_print)
1166 rc = device->discipline->hosts_print(device, m);
1168 dasd_put_device(device);
1172 static int dasd_hosts_open(struct inode *inode, struct file *file)
1174 struct dasd_device *device = inode->i_private;
1176 return single_open(file, dasd_hosts_show, device);
1179 static const struct file_operations dasd_hosts_fops = {
1180 .owner = THIS_MODULE,
1181 .open = dasd_hosts_open,
1183 .llseek = seq_lseek,
1184 .release = single_release,
1187 static void dasd_hosts_exit(struct dasd_device *device)
1189 debugfs_remove(device->hosts_dentry);
1190 device->hosts_dentry = NULL;
1193 static void dasd_hosts_init(struct dentry *base_dentry,
1194 struct dasd_device *device)
1202 mode = S_IRUSR | S_IFREG;
1203 pde = debugfs_create_file("host_access_list", mode, base_dentry,
1204 device, &dasd_hosts_fops);
1205 if (pde && !IS_ERR(pde))
1206 device->hosts_dentry = pde;
1210 * Allocate memory for a channel program with 'cplength' channel
1211 * command words and 'datasize' additional space. There are two
1212 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
1213 * memory and 2) dasd_smalloc_request uses the static ccw memory
1214 * that gets allocated for each device.
1216 struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
1218 struct dasd_device *device)
1220 struct dasd_ccw_req *cqr;
1223 BUG_ON(datasize > PAGE_SIZE ||
1224 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
1226 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
1228 return ERR_PTR(-ENOMEM);
1231 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
1232 GFP_ATOMIC | GFP_DMA);
1233 if (cqr->cpaddr == NULL) {
1235 return ERR_PTR(-ENOMEM);
1240 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
1241 if (cqr->data == NULL) {
1244 return ERR_PTR(-ENOMEM);
1248 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1249 dasd_get_device(device);
1252 EXPORT_SYMBOL(dasd_kmalloc_request);
1254 struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
1256 struct dasd_device *device)
1258 unsigned long flags;
1259 struct dasd_ccw_req *cqr;
1263 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
1265 size += cplength * sizeof(struct ccw1);
1268 spin_lock_irqsave(&device->mem_lock, flags);
1269 cqr = (struct dasd_ccw_req *)
1270 dasd_alloc_chunk(&device->ccw_chunks, size);
1271 spin_unlock_irqrestore(&device->mem_lock, flags);
1273 return ERR_PTR(-ENOMEM);
1274 memset(cqr, 0, sizeof(struct dasd_ccw_req));
1275 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
1278 cqr->cpaddr = (struct ccw1 *) data;
1279 data += cplength*sizeof(struct ccw1);
1280 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
1285 memset(cqr->data, 0, datasize);
1288 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1289 dasd_get_device(device);
1292 EXPORT_SYMBOL(dasd_smalloc_request);
1295 * Free memory of a channel program. This function needs to free all the
1296 * idal lists that might have been created by dasd_set_cda and the
1297 * struct dasd_ccw_req itself.
1299 void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1303 /* Clear any idals used for the request. */
1306 clear_normalized_cda(ccw);
1307 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
1311 dasd_put_device(device);
1313 EXPORT_SYMBOL(dasd_kfree_request);
1315 void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1317 unsigned long flags;
1319 spin_lock_irqsave(&device->mem_lock, flags);
1320 dasd_free_chunk(&device->ccw_chunks, cqr);
1321 spin_unlock_irqrestore(&device->mem_lock, flags);
1322 dasd_put_device(device);
1324 EXPORT_SYMBOL(dasd_sfree_request);
1327 * Check discipline magic in cqr.
1329 static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
1331 struct dasd_device *device;
1335 device = cqr->startdev;
1336 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
1337 DBF_DEV_EVENT(DBF_WARNING, device,
1338 " dasd_ccw_req 0x%08x magic doesn't match"
1339 " discipline 0x%08x",
1341 *(unsigned int *) device->discipline->name);
1348 * Terminate the current i/o and set the request to clear_pending.
1349 * Timer keeps device runnig.
1350 * ccw_device_clear can fail if the i/o subsystem
1353 int dasd_term_IO(struct dasd_ccw_req *cqr)
1355 struct dasd_device *device;
1357 char errorstring[ERRORLENGTH];
1360 rc = dasd_check_cqr(cqr);
1364 device = (struct dasd_device *) cqr->startdev;
1365 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
1366 rc = ccw_device_clear(device->cdev, (long) cqr);
1368 case 0: /* termination successful */
1369 cqr->status = DASD_CQR_CLEAR_PENDING;
1370 cqr->stopclk = get_tod_clock();
1372 DBF_DEV_EVENT(DBF_DEBUG, device,
1373 "terminate cqr %p successful",
1377 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1378 "device gone, retry");
1381 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1382 "I/O error, retry");
1386 * device not valid so no I/O could be running
1387 * handle CQR as termination successful
1389 cqr->status = DASD_CQR_CLEARED;
1390 cqr->stopclk = get_tod_clock();
1392 /* no retries for invalid devices */
1394 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1395 "EINVAL, handle as terminated");
1396 /* fake rc to success */
1400 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1401 "device busy, retry later");
1404 /* internal error 10 - unknown rc*/
1405 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
1406 dev_err(&device->cdev->dev, "An error occurred in the "
1407 "DASD device driver, reason=%s\n", errorstring);
1413 dasd_schedule_device_bh(device);
1416 EXPORT_SYMBOL(dasd_term_IO);
1419 * Start the i/o. This start_IO can fail if the channel is really busy.
1420 * In that case set up a timer to start the request later.
1422 int dasd_start_IO(struct dasd_ccw_req *cqr)
1424 struct dasd_device *device;
1426 char errorstring[ERRORLENGTH];
1429 rc = dasd_check_cqr(cqr);
1434 device = (struct dasd_device *) cqr->startdev;
1436 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) ||
1437 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) &&
1438 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1439 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p "
1440 "because of stolen lock", cqr);
1441 cqr->status = DASD_CQR_ERROR;
1442 cqr->intrc = -EPERM;
1445 if (cqr->retries < 0) {
1446 /* internal error 14 - start_IO run out of retries */
1447 sprintf(errorstring, "14 %p", cqr);
1448 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1449 "device driver, reason=%s\n", errorstring);
1450 cqr->status = DASD_CQR_ERROR;
1453 cqr->startclk = get_tod_clock();
1454 cqr->starttime = jiffies;
1456 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1457 cqr->lpm &= device->path_data.opm;
1459 cqr->lpm = device->path_data.opm;
1461 if (cqr->cpmode == 1) {
1462 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
1463 (long) cqr, cqr->lpm);
1465 rc = ccw_device_start(device->cdev, cqr->cpaddr,
1466 (long) cqr, cqr->lpm, 0);
1470 cqr->status = DASD_CQR_IN_IO;
1473 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1474 "start_IO: device busy, retry later");
1477 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1478 "start_IO: request timeout, retry later");
1481 /* -EACCES indicates that the request used only a subset of the
1482 * available paths and all these paths are gone. If the lpm of
1483 * this request was only a subset of the opm (e.g. the ppm) then
1484 * we just do a retry with all available paths.
1485 * If we already use the full opm, something is amiss, and we
1486 * need a full path verification.
1488 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1489 DBF_DEV_EVENT(DBF_WARNING, device,
1490 "start_IO: selected paths gone (%x)",
1492 } else if (cqr->lpm != device->path_data.opm) {
1493 cqr->lpm = device->path_data.opm;
1494 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
1495 "start_IO: selected paths gone,"
1496 " retry on all paths");
1498 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1499 "start_IO: all paths in opm gone,"
1500 " do path verification");
1501 dasd_generic_last_path_gone(device);
1502 device->path_data.opm = 0;
1503 device->path_data.ppm = 0;
1504 device->path_data.npm = 0;
1505 device->path_data.tbvpm =
1506 ccw_device_get_path_mask(device->cdev);
1510 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1511 "start_IO: -ENODEV device gone, retry");
1514 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1515 "start_IO: -EIO device gone, retry");
1518 /* most likely caused in power management context */
1519 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1520 "start_IO: -EINVAL device currently "
1524 /* internal error 11 - unknown rc */
1525 snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
1526 dev_err(&device->cdev->dev,
1527 "An error occurred in the DASD device driver, "
1528 "reason=%s\n", errorstring);
1535 EXPORT_SYMBOL(dasd_start_IO);
1538 * Timeout function for dasd devices. This is used for different purposes
1539 * 1) missing interrupt handler for normal operation
1540 * 2) delayed start of request where start_IO failed with -EBUSY
1541 * 3) timeout for missing state change interrupts
1542 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
1543 * DASD_CQR_QUEUED for 2) and 3).
1545 static void dasd_device_timeout(unsigned long ptr)
1547 unsigned long flags;
1548 struct dasd_device *device;
1550 device = (struct dasd_device *) ptr;
1551 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1552 /* re-activate request queue */
1553 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1554 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1555 dasd_schedule_device_bh(device);
1559 * Setup timeout for a device in jiffies.
1561 void dasd_device_set_timer(struct dasd_device *device, int expires)
1564 del_timer(&device->timer);
1566 mod_timer(&device->timer, jiffies + expires);
1568 EXPORT_SYMBOL(dasd_device_set_timer);
1571 * Clear timeout for a device.
1573 void dasd_device_clear_timer(struct dasd_device *device)
1575 del_timer(&device->timer);
1577 EXPORT_SYMBOL(dasd_device_clear_timer);
1579 static void dasd_handle_killed_request(struct ccw_device *cdev,
1580 unsigned long intparm)
1582 struct dasd_ccw_req *cqr;
1583 struct dasd_device *device;
1587 cqr = (struct dasd_ccw_req *) intparm;
1588 if (cqr->status != DASD_CQR_IN_IO) {
1589 DBF_EVENT_DEVID(DBF_DEBUG, cdev,
1590 "invalid status in handle_killed_request: "
1591 "%02x", cqr->status);
1595 device = dasd_device_from_cdev_locked(cdev);
1596 if (IS_ERR(device)) {
1597 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1598 "unable to get device from cdev");
1602 if (!cqr->startdev ||
1603 device != cqr->startdev ||
1604 strncmp(cqr->startdev->discipline->ebcname,
1605 (char *) &cqr->magic, 4)) {
1606 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1607 "invalid device in request");
1608 dasd_put_device(device);
1612 /* Schedule request to be retried. */
1613 cqr->status = DASD_CQR_QUEUED;
1615 dasd_device_clear_timer(device);
1616 dasd_schedule_device_bh(device);
1617 dasd_put_device(device);
1620 void dasd_generic_handle_state_change(struct dasd_device *device)
1622 /* First of all start sense subsystem status request. */
1623 dasd_eer_snss(device);
1625 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1626 dasd_schedule_device_bh(device);
1628 dasd_schedule_block_bh(device->block);
1630 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
1633 * Interrupt handler for "normal" ssch-io based dasd devices.
1635 void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1638 struct dasd_ccw_req *cqr, *next;
1639 struct dasd_device *device;
1640 unsigned long long now;
1641 int nrf_suppressed = 0;
1642 int fp_suppressed = 0;
1646 cqr = (struct dasd_ccw_req *) intparm;
1648 switch (PTR_ERR(irb)) {
1650 if (cqr && cqr->status == DASD_CQR_CLEAR_PENDING) {
1651 device = (struct dasd_device *) cqr->startdev;
1652 cqr->status = DASD_CQR_CLEARED;
1653 dasd_device_clear_timer(device);
1654 wake_up(&dasd_flush_wq);
1655 dasd_schedule_device_bh(device);
1660 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1661 "request timed out\n", __func__);
1664 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1665 "unknown error %ld\n", __func__,
1668 dasd_handle_killed_request(cdev, intparm);
1672 now = get_tod_clock();
1673 /* check for conditions that should be handled immediately */
1675 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1676 scsw_cstat(&irb->scsw) == 0)) {
1678 memcpy(&cqr->irb, irb, sizeof(*irb));
1679 device = dasd_device_from_cdev_locked(cdev);
1682 /* ignore unsolicited interrupts for DIAG discipline */
1683 if (device->discipline == dasd_diag_discipline_pointer) {
1684 dasd_put_device(device);
1689 * In some cases 'File Protected' or 'No Record Found' errors
1690 * might be expected and debug log messages for the
1691 * corresponding interrupts shouldn't be written then.
1692 * Check if either of the according suppress bits is set.
1694 sense = dasd_get_sense(irb);
1696 fp_suppressed = (sense[1] & SNS1_FILE_PROTECTED) &&
1697 test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
1698 nrf_suppressed = (sense[1] & SNS1_NO_REC_FOUND) &&
1699 test_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
1701 if (!(fp_suppressed || nrf_suppressed))
1702 device->discipline->dump_sense_dbf(device, irb, "int");
1704 if (device->features & DASD_FEATURE_ERPLOG)
1705 device->discipline->dump_sense(device, cqr, irb);
1706 device->discipline->check_for_device_change(device, cqr, irb);
1707 dasd_put_device(device);
1710 /* check for for attention message */
1711 if (scsw_dstat(&irb->scsw) & DEV_STAT_ATTENTION) {
1712 device = dasd_device_from_cdev_locked(cdev);
1713 device->discipline->check_attention(device, irb->esw.esw1.lpum);
1714 dasd_put_device(device);
1720 device = (struct dasd_device *) cqr->startdev;
1722 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
1723 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1724 "invalid device in request");
1728 /* Check for clear pending */
1729 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
1730 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
1731 cqr->status = DASD_CQR_CLEARED;
1732 dasd_device_clear_timer(device);
1733 wake_up(&dasd_flush_wq);
1734 dasd_schedule_device_bh(device);
1738 /* check status - the request might have been killed by dyn detach */
1739 if (cqr->status != DASD_CQR_IN_IO) {
1740 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1741 "status %02x", dev_name(&cdev->dev), cqr->status);
1747 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1748 scsw_cstat(&irb->scsw) == 0) {
1749 /* request was completed successfully */
1750 cqr->status = DASD_CQR_SUCCESS;
1752 /* Start first request on queue if possible -> fast_io. */
1753 if (cqr->devlist.next != &device->ccw_queue) {
1754 next = list_entry(cqr->devlist.next,
1755 struct dasd_ccw_req, devlist);
1757 } else { /* error */
1759 * If we don't want complex ERP for this request, then just
1760 * reset this and retry it in the fastpath
1762 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
1764 if (cqr->lpm == device->path_data.opm)
1765 DBF_DEV_EVENT(DBF_DEBUG, device,
1766 "default ERP in fastpath "
1767 "(%i retries left)",
1769 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
1770 cqr->lpm = device->path_data.opm;
1771 cqr->status = DASD_CQR_QUEUED;
1774 cqr->status = DASD_CQR_ERROR;
1776 if (next && (next->status == DASD_CQR_QUEUED) &&
1777 (!device->stopped)) {
1778 if (device->discipline->start_IO(next) == 0)
1779 expires = next->expires;
1782 dasd_device_set_timer(device, expires);
1784 dasd_device_clear_timer(device);
1785 dasd_schedule_device_bh(device);
1787 EXPORT_SYMBOL(dasd_int_handler);
1789 enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
1791 struct dasd_device *device;
1793 device = dasd_device_from_cdev_locked(cdev);
1797 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1798 device->state != device->target ||
1799 !device->discipline->check_for_device_change){
1800 dasd_put_device(device);
1803 if (device->discipline->dump_sense_dbf)
1804 device->discipline->dump_sense_dbf(device, irb, "uc");
1805 device->discipline->check_for_device_change(device, NULL, irb);
1806 dasd_put_device(device);
1808 return UC_TODO_RETRY;
1810 EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
1813 * If we have an error on a dasd_block layer request then we cancel
1814 * and return all further requests from the same dasd_block as well.
1816 static void __dasd_device_recovery(struct dasd_device *device,
1817 struct dasd_ccw_req *ref_cqr)
1819 struct list_head *l, *n;
1820 struct dasd_ccw_req *cqr;
1823 * only requeue request that came from the dasd_block layer
1825 if (!ref_cqr->block)
1828 list_for_each_safe(l, n, &device->ccw_queue) {
1829 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1830 if (cqr->status == DASD_CQR_QUEUED &&
1831 ref_cqr->block == cqr->block) {
1832 cqr->status = DASD_CQR_CLEARED;
1838 * Remove those ccw requests from the queue that need to be returned
1839 * to the upper layer.
1841 static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1842 struct list_head *final_queue)
1844 struct list_head *l, *n;
1845 struct dasd_ccw_req *cqr;
1847 /* Process request with final status. */
1848 list_for_each_safe(l, n, &device->ccw_queue) {
1849 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1851 /* Skip any non-final request. */
1852 if (cqr->status == DASD_CQR_QUEUED ||
1853 cqr->status == DASD_CQR_IN_IO ||
1854 cqr->status == DASD_CQR_CLEAR_PENDING)
1856 if (cqr->status == DASD_CQR_ERROR) {
1857 __dasd_device_recovery(device, cqr);
1859 /* Rechain finished requests to final queue */
1860 list_move_tail(&cqr->devlist, final_queue);
1865 * the cqrs from the final queue are returned to the upper layer
1866 * by setting a dasd_block state and calling the callback function
1868 static void __dasd_device_process_final_queue(struct dasd_device *device,
1869 struct list_head *final_queue)
1871 struct list_head *l, *n;
1872 struct dasd_ccw_req *cqr;
1873 struct dasd_block *block;
1874 void (*callback)(struct dasd_ccw_req *, void *data);
1875 void *callback_data;
1876 char errorstring[ERRORLENGTH];
1878 list_for_each_safe(l, n, final_queue) {
1879 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1880 list_del_init(&cqr->devlist);
1882 callback = cqr->callback;
1883 callback_data = cqr->callback_data;
1885 spin_lock_bh(&block->queue_lock);
1886 switch (cqr->status) {
1887 case DASD_CQR_SUCCESS:
1888 cqr->status = DASD_CQR_DONE;
1890 case DASD_CQR_ERROR:
1891 cqr->status = DASD_CQR_NEED_ERP;
1893 case DASD_CQR_CLEARED:
1894 cqr->status = DASD_CQR_TERMINATED;
1897 /* internal error 12 - wrong cqr status*/
1898 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1899 dev_err(&device->cdev->dev,
1900 "An error occurred in the DASD device driver, "
1901 "reason=%s\n", errorstring);
1904 if (cqr->callback != NULL)
1905 (callback)(cqr, callback_data);
1907 spin_unlock_bh(&block->queue_lock);
1912 * Take a look at the first request on the ccw queue and check
1913 * if it reached its expire time. If so, terminate the IO.
1915 static void __dasd_device_check_expire(struct dasd_device *device)
1917 struct dasd_ccw_req *cqr;
1919 if (list_empty(&device->ccw_queue))
1921 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1922 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1923 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
1924 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
1926 * IO in safe offline processing should not
1927 * run out of retries
1931 if (device->discipline->term_IO(cqr) != 0) {
1932 /* Hmpf, try again in 5 sec */
1933 dev_err(&device->cdev->dev,
1934 "cqr %p timed out (%lus) but cannot be "
1935 "ended, retrying in 5 s\n",
1936 cqr, (cqr->expires/HZ));
1937 cqr->expires += 5*HZ;
1938 dasd_device_set_timer(device, 5*HZ);
1940 dev_err(&device->cdev->dev,
1941 "cqr %p timed out (%lus), %i retries "
1942 "remaining\n", cqr, (cqr->expires/HZ),
1949 * return 1 when device is not eligible for IO
1951 static int __dasd_device_is_unusable(struct dasd_device *device,
1952 struct dasd_ccw_req *cqr)
1954 int mask = ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM);
1956 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
1957 /* dasd is being set offline. */
1960 if (device->stopped) {
1961 if (device->stopped & mask) {
1962 /* stopped and CQR will not change that. */
1965 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1966 /* CQR is not able to change device to
1970 /* CQR required to get device operational. */
1976 * Take a look at the first request on the ccw queue and check
1977 * if it needs to be started.
1979 static void __dasd_device_start_head(struct dasd_device *device)
1981 struct dasd_ccw_req *cqr;
1984 if (list_empty(&device->ccw_queue))
1986 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1987 if (cqr->status != DASD_CQR_QUEUED)
1989 /* if device is not usable return request to upper layer */
1990 if (__dasd_device_is_unusable(device, cqr)) {
1991 cqr->intrc = -EAGAIN;
1992 cqr->status = DASD_CQR_CLEARED;
1993 dasd_schedule_device_bh(device);
1997 rc = device->discipline->start_IO(cqr);
1999 dasd_device_set_timer(device, cqr->expires);
2000 else if (rc == -EACCES) {
2001 dasd_schedule_device_bh(device);
2003 /* Hmpf, try again in 1/2 sec */
2004 dasd_device_set_timer(device, 50);
2007 static void __dasd_device_check_path_events(struct dasd_device *device)
2011 if (device->path_data.tbvpm) {
2012 if (device->stopped & ~(DASD_STOPPED_DC_WAIT |
2015 rc = device->discipline->verify_path(
2016 device, device->path_data.tbvpm);
2018 dasd_device_set_timer(device, 50);
2020 device->path_data.tbvpm = 0;
2025 * Go through all request on the dasd_device request queue,
2026 * terminate them on the cdev if necessary, and return them to the
2027 * submitting layer via callback.
2029 * Make sure that all 'submitting layers' still exist when
2030 * this function is called!. In other words, when 'device' is a base
2031 * device then all block layer requests must have been removed before
2032 * via dasd_flush_block_queue.
2034 int dasd_flush_device_queue(struct dasd_device *device)
2036 struct dasd_ccw_req *cqr, *n;
2038 struct list_head flush_queue;
2040 INIT_LIST_HEAD(&flush_queue);
2041 spin_lock_irq(get_ccwdev_lock(device->cdev));
2043 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
2044 /* Check status and move request to flush_queue */
2045 switch (cqr->status) {
2046 case DASD_CQR_IN_IO:
2047 rc = device->discipline->term_IO(cqr);
2049 /* unable to terminate requeust */
2050 dev_err(&device->cdev->dev,
2051 "Flushing the DASD request queue "
2052 "failed for request %p\n", cqr);
2053 /* stop flush processing */
2057 case DASD_CQR_QUEUED:
2058 cqr->stopclk = get_tod_clock();
2059 cqr->status = DASD_CQR_CLEARED;
2061 default: /* no need to modify the others */
2064 list_move_tail(&cqr->devlist, &flush_queue);
2067 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2069 * After this point all requests must be in state CLEAR_PENDING,
2070 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
2071 * one of the others.
2073 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
2074 wait_event(dasd_flush_wq,
2075 (cqr->status != DASD_CQR_CLEAR_PENDING));
2077 * Now set each request back to TERMINATED, DONE or NEED_ERP
2078 * and call the callback function of flushed requests
2080 __dasd_device_process_final_queue(device, &flush_queue);
2083 EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
2086 * Acquire the device lock and process queues for the device.
2088 static void dasd_device_tasklet(struct dasd_device *device)
2090 struct list_head final_queue;
2092 atomic_set (&device->tasklet_scheduled, 0);
2093 INIT_LIST_HEAD(&final_queue);
2094 spin_lock_irq(get_ccwdev_lock(device->cdev));
2095 /* Check expire time of first request on the ccw queue. */
2096 __dasd_device_check_expire(device);
2097 /* find final requests on ccw queue */
2098 __dasd_device_process_ccw_queue(device, &final_queue);
2099 __dasd_device_check_path_events(device);
2100 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2101 /* Now call the callback function of requests with final status */
2102 __dasd_device_process_final_queue(device, &final_queue);
2103 spin_lock_irq(get_ccwdev_lock(device->cdev));
2104 /* Now check if the head of the ccw queue needs to be started. */
2105 __dasd_device_start_head(device);
2106 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2107 if (waitqueue_active(&shutdown_waitq))
2108 wake_up(&shutdown_waitq);
2109 dasd_put_device(device);
2113 * Schedules a call to dasd_tasklet over the device tasklet.
2115 void dasd_schedule_device_bh(struct dasd_device *device)
2117 /* Protect against rescheduling. */
2118 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
2120 dasd_get_device(device);
2121 tasklet_hi_schedule(&device->tasklet);
2123 EXPORT_SYMBOL(dasd_schedule_device_bh);
2125 void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
2127 device->stopped |= bits;
2129 EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
2131 void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
2133 device->stopped &= ~bits;
2134 if (!device->stopped)
2135 wake_up(&generic_waitq);
2137 EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
2140 * Queue a request to the head of the device ccw_queue.
2141 * Start the I/O if possible.
2143 void dasd_add_request_head(struct dasd_ccw_req *cqr)
2145 struct dasd_device *device;
2146 unsigned long flags;
2148 device = cqr->startdev;
2149 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2150 cqr->status = DASD_CQR_QUEUED;
2151 list_add(&cqr->devlist, &device->ccw_queue);
2152 /* let the bh start the request to keep them in order */
2153 dasd_schedule_device_bh(device);
2154 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2156 EXPORT_SYMBOL(dasd_add_request_head);
2159 * Queue a request to the tail of the device ccw_queue.
2160 * Start the I/O if possible.
2162 void dasd_add_request_tail(struct dasd_ccw_req *cqr)
2164 struct dasd_device *device;
2165 unsigned long flags;
2167 device = cqr->startdev;
2168 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2169 cqr->status = DASD_CQR_QUEUED;
2170 list_add_tail(&cqr->devlist, &device->ccw_queue);
2171 /* let the bh start the request to keep them in order */
2172 dasd_schedule_device_bh(device);
2173 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2175 EXPORT_SYMBOL(dasd_add_request_tail);
2178 * Wakeup helper for the 'sleep_on' functions.
2180 void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
2182 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2183 cqr->callback_data = DASD_SLEEPON_END_TAG;
2184 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2185 wake_up(&generic_waitq);
2187 EXPORT_SYMBOL_GPL(dasd_wakeup_cb);
2189 static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
2191 struct dasd_device *device;
2194 device = cqr->startdev;
2195 spin_lock_irq(get_ccwdev_lock(device->cdev));
2196 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
2197 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2202 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
2204 static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
2206 struct dasd_device *device;
2207 dasd_erp_fn_t erp_fn;
2209 if (cqr->status == DASD_CQR_FILLED)
2211 device = cqr->startdev;
2212 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2213 if (cqr->status == DASD_CQR_TERMINATED) {
2214 device->discipline->handle_terminated_request(cqr);
2217 if (cqr->status == DASD_CQR_NEED_ERP) {
2218 erp_fn = device->discipline->erp_action(cqr);
2222 if (cqr->status == DASD_CQR_FAILED)
2223 dasd_log_sense(cqr, &cqr->irb);
2225 __dasd_process_erp(device, cqr);
2232 static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
2234 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2235 if (cqr->refers) /* erp is not done yet */
2237 return ((cqr->status != DASD_CQR_DONE) &&
2238 (cqr->status != DASD_CQR_FAILED));
2240 return (cqr->status == DASD_CQR_FILLED);
2243 static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
2245 struct dasd_device *device;
2247 struct list_head ccw_queue;
2248 struct dasd_ccw_req *cqr;
2250 INIT_LIST_HEAD(&ccw_queue);
2251 maincqr->status = DASD_CQR_FILLED;
2252 device = maincqr->startdev;
2253 list_add(&maincqr->blocklist, &ccw_queue);
2254 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
2255 cqr = list_first_entry(&ccw_queue,
2256 struct dasd_ccw_req, blocklist)) {
2258 if (__dasd_sleep_on_erp(cqr))
2260 if (cqr->status != DASD_CQR_FILLED) /* could be failed */
2262 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2263 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2264 cqr->status = DASD_CQR_FAILED;
2265 cqr->intrc = -EPERM;
2268 /* Non-temporary stop condition will trigger fail fast */
2269 if (device->stopped & ~DASD_STOPPED_PENDING &&
2270 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2271 (!dasd_eer_enabled(device))) {
2272 cqr->status = DASD_CQR_FAILED;
2273 cqr->intrc = -ENOLINK;
2277 * Don't try to start requests if device is stopped
2278 * except path verification requests
2280 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
2281 if (interruptible) {
2282 rc = wait_event_interruptible(
2283 generic_waitq, !(device->stopped));
2284 if (rc == -ERESTARTSYS) {
2285 cqr->status = DASD_CQR_FAILED;
2286 maincqr->intrc = rc;
2290 wait_event(generic_waitq, !(device->stopped));
2293 cqr->callback = dasd_wakeup_cb;
2295 cqr->callback_data = DASD_SLEEPON_START_TAG;
2296 dasd_add_request_tail(cqr);
2297 if (interruptible) {
2298 rc = wait_event_interruptible(
2299 generic_waitq, _wait_for_wakeup(cqr));
2300 if (rc == -ERESTARTSYS) {
2301 dasd_cancel_req(cqr);
2302 /* wait (non-interruptible) for final status */
2303 wait_event(generic_waitq,
2304 _wait_for_wakeup(cqr));
2305 cqr->status = DASD_CQR_FAILED;
2306 maincqr->intrc = rc;
2310 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2313 maincqr->endclk = get_tod_clock();
2314 if ((maincqr->status != DASD_CQR_DONE) &&
2315 (maincqr->intrc != -ERESTARTSYS))
2316 dasd_log_sense(maincqr, &maincqr->irb);
2317 if (maincqr->status == DASD_CQR_DONE)
2319 else if (maincqr->intrc)
2320 rc = maincqr->intrc;
2326 static inline int _wait_for_wakeup_queue(struct list_head *ccw_queue)
2328 struct dasd_ccw_req *cqr;
2330 list_for_each_entry(cqr, ccw_queue, blocklist) {
2331 if (cqr->callback_data != DASD_SLEEPON_END_TAG)
2338 static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible)
2340 struct dasd_device *device;
2341 struct dasd_ccw_req *cqr, *n;
2346 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2347 device = cqr->startdev;
2348 if (cqr->status != DASD_CQR_FILLED) /*could be failed*/
2351 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2352 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2353 cqr->status = DASD_CQR_FAILED;
2354 cqr->intrc = -EPERM;
2357 /*Non-temporary stop condition will trigger fail fast*/
2358 if (device->stopped & ~DASD_STOPPED_PENDING &&
2359 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2360 !dasd_eer_enabled(device)) {
2361 cqr->status = DASD_CQR_FAILED;
2362 cqr->intrc = -EAGAIN;
2366 /*Don't try to start requests if device is stopped*/
2367 if (interruptible) {
2368 rc = wait_event_interruptible(
2369 generic_waitq, !device->stopped);
2370 if (rc == -ERESTARTSYS) {
2371 cqr->status = DASD_CQR_FAILED;
2376 wait_event(generic_waitq, !(device->stopped));
2379 cqr->callback = dasd_wakeup_cb;
2380 cqr->callback_data = DASD_SLEEPON_START_TAG;
2381 dasd_add_request_tail(cqr);
2384 wait_event(generic_waitq, _wait_for_wakeup_queue(ccw_queue));
2387 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2389 * In some cases the 'File Protected' or 'Incorrect Length'
2390 * error might be expected and error recovery would be
2391 * unnecessary in these cases. Check if the according suppress
2394 sense = dasd_get_sense(&cqr->irb);
2395 if (sense && sense[1] & SNS1_FILE_PROTECTED &&
2396 test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags))
2398 if (scsw_cstat(&cqr->irb.scsw) == 0x40 &&
2399 test_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags))
2403 * for alias devices simplify error recovery and
2404 * return to upper layer
2405 * do not skip ERP requests
2407 if (cqr->startdev != cqr->basedev && !cqr->refers &&
2408 (cqr->status == DASD_CQR_TERMINATED ||
2409 cqr->status == DASD_CQR_NEED_ERP))
2412 /* normal recovery for basedev IO */
2413 if (__dasd_sleep_on_erp(cqr))
2414 /* handle erp first */
2422 * Queue a request to the tail of the device ccw_queue and wait for
2425 int dasd_sleep_on(struct dasd_ccw_req *cqr)
2427 return _dasd_sleep_on(cqr, 0);
2429 EXPORT_SYMBOL(dasd_sleep_on);
2432 * Start requests from a ccw_queue and wait for their completion.
2434 int dasd_sleep_on_queue(struct list_head *ccw_queue)
2436 return _dasd_sleep_on_queue(ccw_queue, 0);
2438 EXPORT_SYMBOL(dasd_sleep_on_queue);
2441 * Queue a request to the tail of the device ccw_queue and wait
2442 * interruptible for it's completion.
2444 int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
2446 return _dasd_sleep_on(cqr, 1);
2448 EXPORT_SYMBOL(dasd_sleep_on_interruptible);
2451 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
2452 * for eckd devices) the currently running request has to be terminated
2453 * and be put back to status queued, before the special request is added
2454 * to the head of the queue. Then the special request is waited on normally.
2456 static inline int _dasd_term_running_cqr(struct dasd_device *device)
2458 struct dasd_ccw_req *cqr;
2461 if (list_empty(&device->ccw_queue))
2463 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
2464 rc = device->discipline->term_IO(cqr);
2467 * CQR terminated because a more important request is pending.
2468 * Undo decreasing of retry counter because this is
2469 * not an error case.
2475 int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
2477 struct dasd_device *device;
2480 device = cqr->startdev;
2481 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2482 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2483 cqr->status = DASD_CQR_FAILED;
2484 cqr->intrc = -EPERM;
2487 spin_lock_irq(get_ccwdev_lock(device->cdev));
2488 rc = _dasd_term_running_cqr(device);
2490 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2493 cqr->callback = dasd_wakeup_cb;
2494 cqr->callback_data = DASD_SLEEPON_START_TAG;
2495 cqr->status = DASD_CQR_QUEUED;
2497 * add new request as second
2498 * first the terminated cqr needs to be finished
2500 list_add(&cqr->devlist, device->ccw_queue.next);
2502 /* let the bh start the request to keep them in order */
2503 dasd_schedule_device_bh(device);
2505 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2507 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2509 if (cqr->status == DASD_CQR_DONE)
2511 else if (cqr->intrc)
2517 dasd_schedule_device_bh(device);
2519 dasd_schedule_block_bh(device->block);
2523 EXPORT_SYMBOL(dasd_sleep_on_immediatly);
2526 * Cancels a request that was started with dasd_sleep_on_req.
2527 * This is useful to timeout requests. The request will be
2528 * terminated if it is currently in i/o.
2529 * Returns 0 if request termination was successful
2530 * negative error code if termination failed
2531 * Cancellation of a request is an asynchronous operation! The calling
2532 * function has to wait until the request is properly returned via callback.
2534 int dasd_cancel_req(struct dasd_ccw_req *cqr)
2536 struct dasd_device *device = cqr->startdev;
2537 unsigned long flags;
2541 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2542 switch (cqr->status) {
2543 case DASD_CQR_QUEUED:
2544 /* request was not started - just set to cleared */
2545 cqr->status = DASD_CQR_CLEARED;
2546 if (cqr->callback_data == DASD_SLEEPON_START_TAG)
2547 cqr->callback_data = DASD_SLEEPON_END_TAG;
2549 case DASD_CQR_IN_IO:
2550 /* request in IO - terminate IO and release again */
2551 rc = device->discipline->term_IO(cqr);
2553 dev_err(&device->cdev->dev,
2554 "Cancelling request %p failed with rc=%d\n",
2557 cqr->stopclk = get_tod_clock();
2560 default: /* already finished or clear pending - do nothing */
2563 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2564 dasd_schedule_device_bh(device);
2567 EXPORT_SYMBOL(dasd_cancel_req);
2570 * SECTION: Operations of the dasd_block layer.
2574 * Timeout function for dasd_block. This is used when the block layer
2575 * is waiting for something that may not come reliably, (e.g. a state
2578 static void dasd_block_timeout(unsigned long ptr)
2580 unsigned long flags;
2581 struct dasd_block *block;
2583 block = (struct dasd_block *) ptr;
2584 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
2585 /* re-activate request queue */
2586 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
2587 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
2588 dasd_schedule_block_bh(block);
2592 * Setup timeout for a dasd_block in jiffies.
2594 void dasd_block_set_timer(struct dasd_block *block, int expires)
2597 del_timer(&block->timer);
2599 mod_timer(&block->timer, jiffies + expires);
2601 EXPORT_SYMBOL(dasd_block_set_timer);
2604 * Clear timeout for a dasd_block.
2606 void dasd_block_clear_timer(struct dasd_block *block)
2608 del_timer(&block->timer);
2610 EXPORT_SYMBOL(dasd_block_clear_timer);
2613 * Process finished error recovery ccw.
2615 static void __dasd_process_erp(struct dasd_device *device,
2616 struct dasd_ccw_req *cqr)
2618 dasd_erp_fn_t erp_fn;
2620 if (cqr->status == DASD_CQR_DONE)
2621 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
2623 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
2624 erp_fn = device->discipline->erp_postaction(cqr);
2629 * Fetch requests from the block device queue.
2631 static void __dasd_process_request_queue(struct dasd_block *block)
2633 struct request_queue *queue;
2634 struct request *req;
2635 struct dasd_ccw_req *cqr;
2636 struct dasd_device *basedev;
2637 unsigned long flags;
2638 queue = block->request_queue;
2639 basedev = block->base;
2640 /* No queue ? Then there is nothing to do. */
2645 * We requeue request from the block device queue to the ccw
2646 * queue only in two states. In state DASD_STATE_READY the
2647 * partition detection is done and we need to requeue requests
2648 * for that. State DASD_STATE_ONLINE is normal block device
2651 if (basedev->state < DASD_STATE_READY) {
2652 while ((req = blk_fetch_request(block->request_queue)))
2653 __blk_end_request_all(req, -EIO);
2658 * if device is stopped do not fetch new requests
2659 * except failfast is active which will let requests fail
2660 * immediately in __dasd_block_start_head()
2662 if (basedev->stopped && !(basedev->features & DASD_FEATURE_FAILFAST))
2665 /* Now we try to fetch requests from the request queue */
2666 while ((req = blk_peek_request(queue))) {
2667 if (basedev->features & DASD_FEATURE_READONLY &&
2668 rq_data_dir(req) == WRITE) {
2669 DBF_DEV_EVENT(DBF_ERR, basedev,
2670 "Rejecting write request %p",
2672 blk_start_request(req);
2673 __blk_end_request_all(req, -EIO);
2676 if (test_bit(DASD_FLAG_ABORTALL, &basedev->flags) &&
2677 (basedev->features & DASD_FEATURE_FAILFAST ||
2678 blk_noretry_request(req))) {
2679 DBF_DEV_EVENT(DBF_ERR, basedev,
2680 "Rejecting failfast request %p",
2682 blk_start_request(req);
2683 __blk_end_request_all(req, -ETIMEDOUT);
2686 cqr = basedev->discipline->build_cp(basedev, block, req);
2688 if (PTR_ERR(cqr) == -EBUSY)
2689 break; /* normal end condition */
2690 if (PTR_ERR(cqr) == -ENOMEM)
2691 break; /* terminate request queue loop */
2692 if (PTR_ERR(cqr) == -EAGAIN) {
2694 * The current request cannot be build right
2695 * now, we have to try later. If this request
2696 * is the head-of-queue we stop the device
2699 if (!list_empty(&block->ccw_queue))
2702 get_ccwdev_lock(basedev->cdev), flags);
2703 dasd_device_set_stop_bits(basedev,
2704 DASD_STOPPED_PENDING);
2705 spin_unlock_irqrestore(
2706 get_ccwdev_lock(basedev->cdev), flags);
2707 dasd_block_set_timer(block, HZ/2);
2710 DBF_DEV_EVENT(DBF_ERR, basedev,
2711 "CCW creation failed (rc=%ld) "
2714 blk_start_request(req);
2715 __blk_end_request_all(req, -EIO);
2719 * Note: callback is set to dasd_return_cqr_cb in
2720 * __dasd_block_start_head to cover erp requests as well
2722 cqr->callback_data = (void *) req;
2723 cqr->status = DASD_CQR_FILLED;
2724 req->completion_data = cqr;
2725 blk_start_request(req);
2726 list_add_tail(&cqr->blocklist, &block->ccw_queue);
2727 INIT_LIST_HEAD(&cqr->devlist);
2728 dasd_profile_start(block, cqr, req);
2732 static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
2734 struct request *req;
2738 req = (struct request *) cqr->callback_data;
2739 dasd_profile_end(cqr->block, cqr, req);
2740 status = cqr->block->base->discipline->free_cp(cqr, req);
2743 else if (status == 0) {
2744 if (cqr->intrc == -EPERM)
2746 else if (cqr->intrc == -ENOLINK ||
2747 cqr->intrc == -ETIMEDOUT)
2752 __blk_end_request_all(req, error);
2756 * Process ccw request queue.
2758 static void __dasd_process_block_ccw_queue(struct dasd_block *block,
2759 struct list_head *final_queue)
2761 struct list_head *l, *n;
2762 struct dasd_ccw_req *cqr;
2763 dasd_erp_fn_t erp_fn;
2764 unsigned long flags;
2765 struct dasd_device *base = block->base;
2768 /* Process request with final status. */
2769 list_for_each_safe(l, n, &block->ccw_queue) {
2770 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2771 if (cqr->status != DASD_CQR_DONE &&
2772 cqr->status != DASD_CQR_FAILED &&
2773 cqr->status != DASD_CQR_NEED_ERP &&
2774 cqr->status != DASD_CQR_TERMINATED)
2777 if (cqr->status == DASD_CQR_TERMINATED) {
2778 base->discipline->handle_terminated_request(cqr);
2782 /* Process requests that may be recovered */
2783 if (cqr->status == DASD_CQR_NEED_ERP) {
2784 erp_fn = base->discipline->erp_action(cqr);
2785 if (IS_ERR(erp_fn(cqr)))
2790 /* log sense for fatal error */
2791 if (cqr->status == DASD_CQR_FAILED) {
2792 dasd_log_sense(cqr, &cqr->irb);
2795 /* First of all call extended error reporting. */
2796 if (dasd_eer_enabled(base) &&
2797 cqr->status == DASD_CQR_FAILED) {
2798 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
2800 /* restart request */
2801 cqr->status = DASD_CQR_FILLED;
2803 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
2804 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
2805 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
2810 /* Process finished ERP request. */
2812 __dasd_process_erp(base, cqr);
2816 /* Rechain finished requests to final queue */
2817 cqr->endclk = get_tod_clock();
2818 list_move_tail(&cqr->blocklist, final_queue);
2822 static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
2824 dasd_schedule_block_bh(cqr->block);
2827 static void __dasd_block_start_head(struct dasd_block *block)
2829 struct dasd_ccw_req *cqr;
2831 if (list_empty(&block->ccw_queue))
2833 /* We allways begin with the first requests on the queue, as some
2834 * of previously started requests have to be enqueued on a
2835 * dasd_device again for error recovery.
2837 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
2838 if (cqr->status != DASD_CQR_FILLED)
2840 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
2841 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2842 cqr->status = DASD_CQR_FAILED;
2843 cqr->intrc = -EPERM;
2844 dasd_schedule_block_bh(block);
2847 /* Non-temporary stop condition will trigger fail fast */
2848 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
2849 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2850 (!dasd_eer_enabled(block->base))) {
2851 cqr->status = DASD_CQR_FAILED;
2852 cqr->intrc = -ENOLINK;
2853 dasd_schedule_block_bh(block);
2856 /* Don't try to start requests if device is stopped */
2857 if (block->base->stopped)
2860 /* just a fail safe check, should not happen */
2862 cqr->startdev = block->base;
2864 /* make sure that the requests we submit find their way back */
2865 cqr->callback = dasd_return_cqr_cb;
2867 dasd_add_request_tail(cqr);
2872 * Central dasd_block layer routine. Takes requests from the generic
2873 * block layer request queue, creates ccw requests, enqueues them on
2874 * a dasd_device and processes ccw requests that have been returned.
2876 static void dasd_block_tasklet(struct dasd_block *block)
2878 struct list_head final_queue;
2879 struct list_head *l, *n;
2880 struct dasd_ccw_req *cqr;
2882 atomic_set(&block->tasklet_scheduled, 0);
2883 INIT_LIST_HEAD(&final_queue);
2884 spin_lock(&block->queue_lock);
2885 /* Finish off requests on ccw queue */
2886 __dasd_process_block_ccw_queue(block, &final_queue);
2887 spin_unlock(&block->queue_lock);
2888 /* Now call the callback function of requests with final status */
2889 spin_lock_irq(&block->request_queue_lock);
2890 list_for_each_safe(l, n, &final_queue) {
2891 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2892 list_del_init(&cqr->blocklist);
2893 __dasd_cleanup_cqr(cqr);
2895 spin_lock(&block->queue_lock);
2896 /* Get new request from the block device request queue */
2897 __dasd_process_request_queue(block);
2898 /* Now check if the head of the ccw queue needs to be started. */
2899 __dasd_block_start_head(block);
2900 spin_unlock(&block->queue_lock);
2901 spin_unlock_irq(&block->request_queue_lock);
2902 if (waitqueue_active(&shutdown_waitq))
2903 wake_up(&shutdown_waitq);
2904 dasd_put_device(block->base);
2907 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2909 wake_up(&dasd_flush_wq);
2913 * Requeue a request back to the block request queue
2914 * only works for block requests
2916 static int _dasd_requeue_request(struct dasd_ccw_req *cqr)
2918 struct dasd_block *block = cqr->block;
2919 struct request *req;
2920 unsigned long flags;
2924 spin_lock_irqsave(&block->queue_lock, flags);
2925 req = (struct request *) cqr->callback_data;
2926 blk_requeue_request(block->request_queue, req);
2927 spin_unlock_irqrestore(&block->queue_lock, flags);
2933 * Go through all request on the dasd_block request queue, cancel them
2934 * on the respective dasd_device, and return them to the generic
2937 static int dasd_flush_block_queue(struct dasd_block *block)
2939 struct dasd_ccw_req *cqr, *n;
2941 struct list_head flush_queue;
2943 INIT_LIST_HEAD(&flush_queue);
2944 spin_lock_bh(&block->queue_lock);
2947 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2948 /* if this request currently owned by a dasd_device cancel it */
2949 if (cqr->status >= DASD_CQR_QUEUED)
2950 rc = dasd_cancel_req(cqr);
2953 /* Rechain request (including erp chain) so it won't be
2954 * touched by the dasd_block_tasklet anymore.
2955 * Replace the callback so we notice when the request
2956 * is returned from the dasd_device layer.
2958 cqr->callback = _dasd_wake_block_flush_cb;
2959 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2960 list_move_tail(&cqr->blocklist, &flush_queue);
2962 /* moved more than one request - need to restart */
2965 spin_unlock_bh(&block->queue_lock);
2966 /* Now call the callback function of flushed requests */
2968 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
2969 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
2970 /* Process finished ERP request. */
2972 spin_lock_bh(&block->queue_lock);
2973 __dasd_process_erp(block->base, cqr);
2974 spin_unlock_bh(&block->queue_lock);
2975 /* restart list_for_xx loop since dasd_process_erp
2976 * might remove multiple elements */
2979 /* call the callback function */
2980 spin_lock_irq(&block->request_queue_lock);
2981 cqr->endclk = get_tod_clock();
2982 list_del_init(&cqr->blocklist);
2983 __dasd_cleanup_cqr(cqr);
2984 spin_unlock_irq(&block->request_queue_lock);
2990 * Schedules a call to dasd_tasklet over the device tasklet.
2992 void dasd_schedule_block_bh(struct dasd_block *block)
2994 /* Protect against rescheduling. */
2995 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
2997 /* life cycle of block is bound to it's base device */
2998 dasd_get_device(block->base);
2999 tasklet_hi_schedule(&block->tasklet);
3001 EXPORT_SYMBOL(dasd_schedule_block_bh);
3005 * SECTION: external block device operations
3006 * (request queue handling, open, release, etc.)
3010 * Dasd request queue function. Called from ll_rw_blk.c
3012 static void do_dasd_request(struct request_queue *queue)
3014 struct dasd_block *block;
3016 block = queue->queuedata;
3017 spin_lock(&block->queue_lock);
3018 /* Get new request from the block device request queue */
3019 __dasd_process_request_queue(block);
3020 /* Now check if the head of the ccw queue needs to be started. */
3021 __dasd_block_start_head(block);
3022 spin_unlock(&block->queue_lock);
3026 * Block timeout callback, called from the block layer
3028 * request_queue lock is held on entry.
3031 * BLK_EH_RESET_TIMER if the request should be left running
3032 * BLK_EH_NOT_HANDLED if the request is handled or terminated
3035 enum blk_eh_timer_return dasd_times_out(struct request *req)
3037 struct dasd_ccw_req *cqr = req->completion_data;
3038 struct dasd_block *block = req->q->queuedata;
3039 struct dasd_device *device;
3043 return BLK_EH_NOT_HANDLED;
3045 device = cqr->startdev ? cqr->startdev : block->base;
3046 if (!device->blk_timeout)
3047 return BLK_EH_RESET_TIMER;
3048 DBF_DEV_EVENT(DBF_WARNING, device,
3049 " dasd_times_out cqr %p status %x",
3052 spin_lock(&block->queue_lock);
3053 spin_lock(get_ccwdev_lock(device->cdev));
3055 cqr->intrc = -ETIMEDOUT;
3056 if (cqr->status >= DASD_CQR_QUEUED) {
3057 spin_unlock(get_ccwdev_lock(device->cdev));
3058 rc = dasd_cancel_req(cqr);
3059 } else if (cqr->status == DASD_CQR_FILLED ||
3060 cqr->status == DASD_CQR_NEED_ERP) {
3061 cqr->status = DASD_CQR_TERMINATED;
3062 spin_unlock(get_ccwdev_lock(device->cdev));
3063 } else if (cqr->status == DASD_CQR_IN_ERP) {
3064 struct dasd_ccw_req *searchcqr, *nextcqr, *tmpcqr;
3066 list_for_each_entry_safe(searchcqr, nextcqr,
3067 &block->ccw_queue, blocklist) {
3069 while (tmpcqr->refers)
3070 tmpcqr = tmpcqr->refers;
3073 /* searchcqr is an ERP request for cqr */
3074 searchcqr->retries = -1;
3075 searchcqr->intrc = -ETIMEDOUT;
3076 if (searchcqr->status >= DASD_CQR_QUEUED) {
3077 spin_unlock(get_ccwdev_lock(device->cdev));
3078 rc = dasd_cancel_req(searchcqr);
3079 spin_lock(get_ccwdev_lock(device->cdev));
3080 } else if ((searchcqr->status == DASD_CQR_FILLED) ||
3081 (searchcqr->status == DASD_CQR_NEED_ERP)) {
3082 searchcqr->status = DASD_CQR_TERMINATED;
3084 } else if (searchcqr->status == DASD_CQR_IN_ERP) {
3086 * Shouldn't happen; most recent ERP
3087 * request is at the front of queue
3093 spin_unlock(get_ccwdev_lock(device->cdev));
3095 dasd_schedule_block_bh(block);
3096 spin_unlock(&block->queue_lock);
3098 return rc ? BLK_EH_RESET_TIMER : BLK_EH_NOT_HANDLED;
3102 * Allocate and initialize request queue and default I/O scheduler.
3104 static int dasd_alloc_queue(struct dasd_block *block)
3106 block->request_queue = blk_init_queue(do_dasd_request,
3107 &block->request_queue_lock);
3108 if (block->request_queue == NULL)
3111 block->request_queue->queuedata = block;
3117 * Allocate and initialize request queue.
3119 static void dasd_setup_queue(struct dasd_block *block)
3123 if (block->base->features & DASD_FEATURE_USERAW) {
3125 * the max_blocks value for raw_track access is 256
3126 * it is higher than the native ECKD value because we
3127 * only need one ccw per track
3128 * so the max_hw_sectors are
3129 * 2048 x 512B = 1024kB = 16 tracks
3133 max = block->base->discipline->max_blocks << block->s2b_shift;
3135 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, block->request_queue);
3136 block->request_queue->limits.max_dev_sectors = max;
3137 blk_queue_logical_block_size(block->request_queue,
3139 blk_queue_max_hw_sectors(block->request_queue, max);
3140 blk_queue_max_segments(block->request_queue, -1L);
3141 /* with page sized segments we can translate each segement into
3144 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
3145 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
3149 * Deactivate and free request queue.
3151 static void dasd_free_queue(struct dasd_block *block)
3153 if (block->request_queue) {
3154 blk_cleanup_queue(block->request_queue);
3155 block->request_queue = NULL;
3160 * Flush request on the request queue.
3162 static void dasd_flush_request_queue(struct dasd_block *block)
3164 struct request *req;
3166 if (!block->request_queue)
3169 spin_lock_irq(&block->request_queue_lock);
3170 while ((req = blk_fetch_request(block->request_queue)))
3171 __blk_end_request_all(req, -EIO);
3172 spin_unlock_irq(&block->request_queue_lock);
3175 static int dasd_open(struct block_device *bdev, fmode_t mode)
3177 struct dasd_device *base;
3180 base = dasd_device_from_gendisk(bdev->bd_disk);
3184 atomic_inc(&base->block->open_count);
3185 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
3190 if (!try_module_get(base->discipline->owner)) {
3195 if (dasd_probeonly) {
3196 dev_info(&base->cdev->dev,
3197 "Accessing the DASD failed because it is in "
3198 "probeonly mode\n");
3203 if (base->state <= DASD_STATE_BASIC) {
3204 DBF_DEV_EVENT(DBF_ERR, base, " %s",
3205 " Cannot open unrecognized device");
3210 if ((mode & FMODE_WRITE) &&
3211 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
3212 (base->features & DASD_FEATURE_READONLY))) {
3217 dasd_put_device(base);
3221 module_put(base->discipline->owner);
3223 atomic_dec(&base->block->open_count);
3224 dasd_put_device(base);
3228 static void dasd_release(struct gendisk *disk, fmode_t mode)
3230 struct dasd_device *base = dasd_device_from_gendisk(disk);
3232 atomic_dec(&base->block->open_count);
3233 module_put(base->discipline->owner);
3234 dasd_put_device(base);
3239 * Return disk geometry.
3241 static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3243 struct dasd_device *base;
3245 base = dasd_device_from_gendisk(bdev->bd_disk);
3249 if (!base->discipline ||
3250 !base->discipline->fill_geometry) {
3251 dasd_put_device(base);
3254 base->discipline->fill_geometry(base->block, geo);
3255 geo->start = get_start_sect(bdev) >> base->block->s2b_shift;
3256 dasd_put_device(base);
3260 const struct block_device_operations
3261 dasd_device_operations = {
3262 .owner = THIS_MODULE,
3264 .release = dasd_release,
3265 .ioctl = dasd_ioctl,
3266 .compat_ioctl = dasd_ioctl,
3267 .getgeo = dasd_getgeo,
3270 /*******************************************************************************
3271 * end of block device operations
3277 #ifdef CONFIG_PROC_FS
3281 if (dasd_page_cache != NULL) {
3282 kmem_cache_destroy(dasd_page_cache);
3283 dasd_page_cache = NULL;
3285 dasd_gendisk_exit();
3287 if (dasd_debug_area != NULL) {
3288 debug_unregister(dasd_debug_area);
3289 dasd_debug_area = NULL;
3291 dasd_statistics_removeroot();
3295 * SECTION: common functions for ccw_driver use
3299 * Is the device read-only?
3300 * Note that this function does not report the setting of the
3301 * readonly device attribute, but how it is configured in z/VM.
3303 int dasd_device_is_ro(struct dasd_device *device)
3305 struct ccw_dev_id dev_id;
3306 struct diag210 diag_data;
3311 ccw_device_get_id(device->cdev, &dev_id);
3312 memset(&diag_data, 0, sizeof(diag_data));
3313 diag_data.vrdcdvno = dev_id.devno;
3314 diag_data.vrdclen = sizeof(diag_data);
3315 rc = diag210(&diag_data);
3316 if (rc == 0 || rc == 2) {
3317 return diag_data.vrdcvfla & 0x80;
3319 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
3324 EXPORT_SYMBOL_GPL(dasd_device_is_ro);
3326 static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
3328 struct ccw_device *cdev = data;
3331 ret = ccw_device_set_online(cdev);
3333 pr_warn("%s: Setting the DASD online failed with rc=%d\n",
3334 dev_name(&cdev->dev), ret);
3338 * Initial attempt at a probe function. this can be simplified once
3339 * the other detection code is gone.
3341 int dasd_generic_probe(struct ccw_device *cdev,
3342 struct dasd_discipline *discipline)
3346 ret = dasd_add_sysfs_files(cdev);
3348 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
3349 "dasd_generic_probe: could not add "
3353 cdev->handler = &dasd_int_handler;
3356 * Automatically online either all dasd devices (dasd_autodetect)
3357 * or all devices specified with dasd= parameters during
3360 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
3361 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
3362 async_schedule(dasd_generic_auto_online, cdev);
3365 EXPORT_SYMBOL_GPL(dasd_generic_probe);
3368 * This will one day be called from a global not_oper handler.
3369 * It is also used by driver_unregister during module unload.
3371 void dasd_generic_remove(struct ccw_device *cdev)
3373 struct dasd_device *device;
3374 struct dasd_block *block;
3376 cdev->handler = NULL;
3378 device = dasd_device_from_cdev(cdev);
3379 if (IS_ERR(device)) {
3380 dasd_remove_sysfs_files(cdev);
3383 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3384 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3385 /* Already doing offline processing */
3386 dasd_put_device(device);
3387 dasd_remove_sysfs_files(cdev);
3391 * This device is removed unconditionally. Set offline
3392 * flag to prevent dasd_open from opening it while it is
3393 * no quite down yet.
3395 dasd_set_target_state(device, DASD_STATE_NEW);
3396 /* dasd_delete_device destroys the device reference. */
3397 block = device->block;
3398 dasd_delete_device(device);
3400 * life cycle of block is bound to device, so delete it after
3401 * device was safely removed
3404 dasd_free_block(block);
3406 dasd_remove_sysfs_files(cdev);
3408 EXPORT_SYMBOL_GPL(dasd_generic_remove);
3411 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
3412 * the device is detected for the first time and is supposed to be used
3413 * or the user has started activation through sysfs.
3415 int dasd_generic_set_online(struct ccw_device *cdev,
3416 struct dasd_discipline *base_discipline)
3418 struct dasd_discipline *discipline;
3419 struct dasd_device *device;
3422 /* first online clears initial online feature flag */
3423 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
3424 device = dasd_create_device(cdev);
3426 return PTR_ERR(device);
3428 discipline = base_discipline;
3429 if (device->features & DASD_FEATURE_USEDIAG) {
3430 if (!dasd_diag_discipline_pointer) {
3431 /* Try to load the required module. */
3432 rc = request_module(DASD_DIAG_MOD);
3434 pr_warn("%s Setting the DASD online failed "
3435 "because the required module %s "
3436 "could not be loaded (rc=%d)\n",
3437 dev_name(&cdev->dev), DASD_DIAG_MOD,
3439 dasd_delete_device(device);
3443 /* Module init could have failed, so check again here after
3444 * request_module(). */
3445 if (!dasd_diag_discipline_pointer) {
3446 pr_warn("%s Setting the DASD online failed because of missing DIAG discipline\n",
3447 dev_name(&cdev->dev));
3448 dasd_delete_device(device);
3451 discipline = dasd_diag_discipline_pointer;
3453 if (!try_module_get(base_discipline->owner)) {
3454 dasd_delete_device(device);
3457 if (!try_module_get(discipline->owner)) {
3458 module_put(base_discipline->owner);
3459 dasd_delete_device(device);
3462 device->base_discipline = base_discipline;
3463 device->discipline = discipline;
3465 /* check_device will allocate block device if necessary */
3466 rc = discipline->check_device(device);
3468 pr_warn("%s Setting the DASD online with discipline %s failed with rc=%i\n",
3469 dev_name(&cdev->dev), discipline->name, rc);
3470 module_put(discipline->owner);
3471 module_put(base_discipline->owner);
3472 dasd_delete_device(device);
3476 dasd_set_target_state(device, DASD_STATE_ONLINE);
3477 if (device->state <= DASD_STATE_KNOWN) {
3478 pr_warn("%s Setting the DASD online failed because of a missing discipline\n",
3479 dev_name(&cdev->dev));
3481 dasd_set_target_state(device, DASD_STATE_NEW);
3483 dasd_free_block(device->block);
3484 dasd_delete_device(device);
3486 pr_debug("dasd_generic device %s found\n",
3487 dev_name(&cdev->dev));
3489 wait_event(dasd_init_waitq, _wait_for_device(device));
3491 dasd_put_device(device);
3494 EXPORT_SYMBOL_GPL(dasd_generic_set_online);
3496 int dasd_generic_set_offline(struct ccw_device *cdev)
3498 struct dasd_device *device;
3499 struct dasd_block *block;
3500 int max_count, open_count, rc;
3503 device = dasd_device_from_cdev(cdev);
3505 return PTR_ERR(device);
3508 * We must make sure that this device is currently not in use.
3509 * The open_count is increased for every opener, that includes
3510 * the blkdev_get in dasd_scan_partitions. We are only interested
3511 * in the other openers.
3513 if (device->block) {
3514 max_count = device->block->bdev ? 0 : -1;
3515 open_count = atomic_read(&device->block->open_count);
3516 if (open_count > max_count) {
3518 pr_warn("%s: The DASD cannot be set offline with open count %i\n",
3519 dev_name(&cdev->dev), open_count);
3521 pr_warn("%s: The DASD cannot be set offline while it is in use\n",
3522 dev_name(&cdev->dev));
3523 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3524 dasd_put_device(device);
3529 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3531 * safe offline already running
3532 * could only be called by normal offline so safe_offline flag
3533 * needs to be removed to run normal offline and kill all I/O
3535 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3536 /* Already doing normal offline processing */
3537 dasd_put_device(device);
3540 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
3543 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3544 /* Already doing offline processing */
3545 dasd_put_device(device);
3550 * if safe_offline called set safe_offline_running flag and
3551 * clear safe_offline so that a call to normal offline
3552 * can overrun safe_offline processing
3554 if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags) &&
3555 !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3557 * If we want to set the device safe offline all IO operations
3558 * should be finished before continuing the offline process
3559 * so sync bdev first and then wait for our queues to become
3562 /* sync blockdev and partitions */
3563 rc = fsync_bdev(device->block->bdev);
3567 /* schedule device tasklet and wait for completion */
3568 dasd_schedule_device_bh(device);
3569 rc = wait_event_interruptible(shutdown_waitq,
3570 _wait_for_empty_queues(device));
3575 set_bit(DASD_FLAG_OFFLINE, &device->flags);
3576 dasd_set_target_state(device, DASD_STATE_NEW);
3577 /* dasd_delete_device destroys the device reference. */
3578 block = device->block;
3579 dasd_delete_device(device);
3581 * life cycle of block is bound to device, so delete it after
3582 * device was safely removed
3585 dasd_free_block(block);
3589 /* interrupted by signal */
3590 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
3591 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags);
3592 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3593 dasd_put_device(device);
3596 EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
3598 int dasd_generic_last_path_gone(struct dasd_device *device)
3600 struct dasd_ccw_req *cqr;
3602 dev_warn(&device->cdev->dev, "No operational channel path is left "
3603 "for the device\n");
3604 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
3605 /* First of all call extended error reporting. */
3606 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3608 if (device->state < DASD_STATE_BASIC)
3610 /* Device is active. We want to keep it. */
3611 list_for_each_entry(cqr, &device->ccw_queue, devlist)
3612 if ((cqr->status == DASD_CQR_IN_IO) ||
3613 (cqr->status == DASD_CQR_CLEAR_PENDING)) {
3614 cqr->status = DASD_CQR_QUEUED;
3617 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
3618 dasd_device_clear_timer(device);
3619 dasd_schedule_device_bh(device);
3622 EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
3624 int dasd_generic_path_operational(struct dasd_device *device)
3626 dev_info(&device->cdev->dev, "A channel path to the device has become "
3628 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
3629 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
3630 if (device->stopped & DASD_UNRESUMED_PM) {
3631 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
3632 dasd_restore_device(device);
3635 dasd_schedule_device_bh(device);
3637 dasd_schedule_block_bh(device->block);
3639 if (!device->stopped)
3640 wake_up(&generic_waitq);
3644 EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
3646 int dasd_generic_notify(struct ccw_device *cdev, int event)
3648 struct dasd_device *device;
3651 device = dasd_device_from_cdev_locked(cdev);
3659 device->path_data.opm = 0;
3660 device->path_data.ppm = 0;
3661 device->path_data.npm = 0;
3662 ret = dasd_generic_last_path_gone(device);
3666 if (device->path_data.opm)
3667 ret = dasd_generic_path_operational(device);
3670 dasd_put_device(device);
3673 EXPORT_SYMBOL_GPL(dasd_generic_notify);
3675 void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
3678 __u8 oldopm, eventlpm;
3679 struct dasd_device *device;
3681 device = dasd_device_from_cdev_locked(cdev);
3684 for (chp = 0; chp < 8; chp++) {
3685 eventlpm = 0x80 >> chp;
3686 if (path_event[chp] & PE_PATH_GONE) {
3687 oldopm = device->path_data.opm;
3688 device->path_data.opm &= ~eventlpm;
3689 device->path_data.ppm &= ~eventlpm;
3690 device->path_data.npm &= ~eventlpm;
3691 if (oldopm && !device->path_data.opm) {
3692 dev_warn(&device->cdev->dev,
3693 "No verified channel paths remain "
3694 "for the device\n");
3695 DBF_DEV_EVENT(DBF_WARNING, device,
3696 "%s", "last verified path gone");
3697 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3698 dasd_device_set_stop_bits(device,
3699 DASD_STOPPED_DC_WAIT);
3702 if (path_event[chp] & PE_PATH_AVAILABLE) {
3703 device->path_data.opm &= ~eventlpm;
3704 device->path_data.ppm &= ~eventlpm;
3705 device->path_data.npm &= ~eventlpm;
3706 device->path_data.tbvpm |= eventlpm;
3707 dasd_schedule_device_bh(device);
3709 if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) {
3710 if (!(device->path_data.opm & eventlpm) &&
3711 !(device->path_data.tbvpm & eventlpm)) {
3713 * we can not establish a pathgroup on an
3714 * unavailable path, so trigger a path
3715 * verification first
3717 device->path_data.tbvpm |= eventlpm;
3718 dasd_schedule_device_bh(device);
3720 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3721 "Pathgroup re-established\n");
3722 if (device->discipline->kick_validate)
3723 device->discipline->kick_validate(device);
3726 dasd_put_device(device);
3728 EXPORT_SYMBOL_GPL(dasd_generic_path_event);
3730 int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
3732 if (!device->path_data.opm && lpm) {
3733 device->path_data.opm = lpm;
3734 dasd_generic_path_operational(device);
3736 device->path_data.opm |= lpm;
3739 EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
3742 int dasd_generic_pm_freeze(struct ccw_device *cdev)
3744 struct dasd_device *device = dasd_device_from_cdev(cdev);
3745 struct list_head freeze_queue;
3746 struct dasd_ccw_req *cqr, *n;
3747 struct dasd_ccw_req *refers;
3751 return PTR_ERR(device);
3753 /* mark device as suspended */
3754 set_bit(DASD_FLAG_SUSPENDED, &device->flags);
3756 if (device->discipline->freeze)
3757 rc = device->discipline->freeze(device);
3759 /* disallow new I/O */
3760 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
3762 /* clear active requests and requeue them to block layer if possible */
3763 INIT_LIST_HEAD(&freeze_queue);
3764 spin_lock_irq(get_ccwdev_lock(cdev));
3766 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
3767 /* Check status and move request to flush_queue */
3768 if (cqr->status == DASD_CQR_IN_IO) {
3769 rc = device->discipline->term_IO(cqr);
3771 /* unable to terminate requeust */
3772 dev_err(&device->cdev->dev,
3773 "Unable to terminate request %p "
3774 "on suspend\n", cqr);
3775 spin_unlock_irq(get_ccwdev_lock(cdev));
3776 dasd_put_device(device);
3780 list_move_tail(&cqr->devlist, &freeze_queue);
3782 spin_unlock_irq(get_ccwdev_lock(cdev));
3784 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
3785 wait_event(dasd_flush_wq,
3786 (cqr->status != DASD_CQR_CLEAR_PENDING));
3787 if (cqr->status == DASD_CQR_CLEARED)
3788 cqr->status = DASD_CQR_QUEUED;
3790 /* requeue requests to blocklayer will only work for
3791 block device requests */
3792 if (_dasd_requeue_request(cqr))
3795 /* remove requests from device and block queue */
3796 list_del_init(&cqr->devlist);
3797 while (cqr->refers != NULL) {
3798 refers = cqr->refers;
3799 /* remove the request from the block queue */
3800 list_del(&cqr->blocklist);
3801 /* free the finished erp request */
3802 dasd_free_erp_request(cqr, cqr->memdev);
3806 list_del_init(&cqr->blocklist);
3807 cqr->block->base->discipline->free_cp(
3808 cqr, (struct request *) cqr->callback_data);
3812 * if requests remain then they are internal request
3813 * and go back to the device queue
3815 if (!list_empty(&freeze_queue)) {
3816 /* move freeze_queue to start of the ccw_queue */
3817 spin_lock_irq(get_ccwdev_lock(cdev));
3818 list_splice_tail(&freeze_queue, &device->ccw_queue);
3819 spin_unlock_irq(get_ccwdev_lock(cdev));
3821 dasd_put_device(device);
3824 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
3826 int dasd_generic_restore_device(struct ccw_device *cdev)
3828 struct dasd_device *device = dasd_device_from_cdev(cdev);
3832 return PTR_ERR(device);
3834 /* allow new IO again */
3835 dasd_device_remove_stop_bits(device,
3836 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
3838 dasd_schedule_device_bh(device);
3841 * call discipline restore function
3842 * if device is stopped do nothing e.g. for disconnected devices
3844 if (device->discipline->restore && !(device->stopped))
3845 rc = device->discipline->restore(device);
3846 if (rc || device->stopped)
3848 * if the resume failed for the DASD we put it in
3849 * an UNRESUMED stop state
3851 device->stopped |= DASD_UNRESUMED_PM;
3854 dasd_schedule_block_bh(device->block);
3856 clear_bit(DASD_FLAG_SUSPENDED, &device->flags);
3857 dasd_put_device(device);
3860 EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
3862 static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
3864 int rdc_buffer_size,
3867 struct dasd_ccw_req *cqr;
3869 unsigned long *idaw;
3871 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
3874 /* internal error 13 - Allocating the RDC request failed*/
3875 dev_err(&device->cdev->dev,
3876 "An error occurred in the DASD device driver, "
3877 "reason=%s\n", "13");
3882 ccw->cmd_code = CCW_CMD_RDC;
3883 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
3884 idaw = (unsigned long *) (cqr->data);
3885 ccw->cda = (__u32)(addr_t) idaw;
3886 ccw->flags = CCW_FLAG_IDA;
3887 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
3889 ccw->cda = (__u32)(addr_t) rdc_buffer;
3893 ccw->count = rdc_buffer_size;
3894 cqr->startdev = device;
3895 cqr->memdev = device;
3896 cqr->expires = 10*HZ;
3898 cqr->buildclk = get_tod_clock();
3899 cqr->status = DASD_CQR_FILLED;
3904 int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
3905 void *rdc_buffer, int rdc_buffer_size)
3908 struct dasd_ccw_req *cqr;
3910 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
3913 return PTR_ERR(cqr);
3915 ret = dasd_sleep_on(cqr);
3916 dasd_sfree_request(cqr, cqr->memdev);
3919 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
3922 * In command mode and transport mode we need to look for sense
3923 * data in different places. The sense data itself is allways
3924 * an array of 32 bytes, so we can unify the sense data access
3927 char *dasd_get_sense(struct irb *irb)
3929 struct tsb *tsb = NULL;
3932 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
3933 if (irb->scsw.tm.tcw)
3934 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
3936 if (tsb && tsb->length == 64 && tsb->flags)
3937 switch (tsb->flags & 0x07) {
3938 case 1: /* tsa_iostat */
3939 sense = tsb->tsa.iostat.sense;
3941 case 2: /* tsa_ddpc */
3942 sense = tsb->tsa.ddpc.sense;
3945 /* currently we don't use interrogate data */
3948 } else if (irb->esw.esw0.erw.cons) {
3953 EXPORT_SYMBOL_GPL(dasd_get_sense);
3955 void dasd_generic_shutdown(struct ccw_device *cdev)
3957 struct dasd_device *device;
3959 device = dasd_device_from_cdev(cdev);
3964 dasd_schedule_block_bh(device->block);
3966 dasd_schedule_device_bh(device);
3968 wait_event(shutdown_waitq, _wait_for_empty_queues(device));
3970 EXPORT_SYMBOL_GPL(dasd_generic_shutdown);
3972 static int __init dasd_init(void)
3976 init_waitqueue_head(&dasd_init_waitq);
3977 init_waitqueue_head(&dasd_flush_wq);
3978 init_waitqueue_head(&generic_waitq);
3979 init_waitqueue_head(&shutdown_waitq);
3981 /* register 'common' DASD debug area, used for all DBF_XXX calls */
3982 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
3983 if (dasd_debug_area == NULL) {
3987 debug_register_view(dasd_debug_area, &debug_sprintf_view);
3988 debug_set_level(dasd_debug_area, DBF_WARNING);
3990 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
3992 dasd_diag_discipline_pointer = NULL;
3994 dasd_statistics_createroot();
3996 rc = dasd_devmap_init();
3999 rc = dasd_gendisk_init();
4005 rc = dasd_eer_init();
4008 #ifdef CONFIG_PROC_FS
4009 rc = dasd_proc_init();
4016 pr_info("The DASD device driver could not be initialized\n");
4021 module_init(dasd_init);
4022 module_exit(dasd_exit);