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 *);
80 * SECTION: Operations on the device structure.
82 static wait_queue_head_t dasd_init_waitq;
83 static wait_queue_head_t dasd_flush_wq;
84 static wait_queue_head_t generic_waitq;
85 static wait_queue_head_t shutdown_waitq;
88 * Allocate memory for a new device structure.
90 struct dasd_device *dasd_alloc_device(void)
92 struct dasd_device *device;
94 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC);
96 return ERR_PTR(-ENOMEM);
98 /* Get two pages for normal block device operations. */
99 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
100 if (!device->ccw_mem) {
102 return ERR_PTR(-ENOMEM);
104 /* Get one page for error recovery. */
105 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
106 if (!device->erp_mem) {
107 free_pages((unsigned long) device->ccw_mem, 1);
109 return ERR_PTR(-ENOMEM);
112 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
113 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
114 spin_lock_init(&device->mem_lock);
115 atomic_set(&device->tasklet_scheduled, 0);
116 tasklet_init(&device->tasklet,
117 (void (*)(unsigned long)) dasd_device_tasklet,
118 (unsigned long) device);
119 INIT_LIST_HEAD(&device->ccw_queue);
120 init_timer(&device->timer);
121 device->timer.function = dasd_device_timeout;
122 device->timer.data = (unsigned long) device;
123 INIT_WORK(&device->kick_work, do_kick_device);
124 INIT_WORK(&device->restore_device, do_restore_device);
125 INIT_WORK(&device->reload_device, do_reload_device);
126 device->state = DASD_STATE_NEW;
127 device->target = DASD_STATE_NEW;
128 mutex_init(&device->state_mutex);
129 spin_lock_init(&device->profile.lock);
134 * Free memory of a device structure.
136 void dasd_free_device(struct dasd_device *device)
138 kfree(device->private);
139 free_page((unsigned long) device->erp_mem);
140 free_pages((unsigned long) device->ccw_mem, 1);
145 * Allocate memory for a new device structure.
147 struct dasd_block *dasd_alloc_block(void)
149 struct dasd_block *block;
151 block = kzalloc(sizeof(*block), GFP_ATOMIC);
153 return ERR_PTR(-ENOMEM);
154 /* open_count = 0 means device online but not in use */
155 atomic_set(&block->open_count, -1);
157 spin_lock_init(&block->request_queue_lock);
158 atomic_set(&block->tasklet_scheduled, 0);
159 tasklet_init(&block->tasklet,
160 (void (*)(unsigned long)) dasd_block_tasklet,
161 (unsigned long) block);
162 INIT_LIST_HEAD(&block->ccw_queue);
163 spin_lock_init(&block->queue_lock);
164 init_timer(&block->timer);
165 block->timer.function = dasd_block_timeout;
166 block->timer.data = (unsigned long) block;
167 spin_lock_init(&block->profile.lock);
171 EXPORT_SYMBOL_GPL(dasd_alloc_block);
174 * Free memory of a device structure.
176 void dasd_free_block(struct dasd_block *block)
180 EXPORT_SYMBOL_GPL(dasd_free_block);
183 * Make a new device known to the system.
185 static int dasd_state_new_to_known(struct dasd_device *device)
190 * As long as the device is not in state DASD_STATE_NEW we want to
191 * keep the reference count > 0.
193 dasd_get_device(device);
196 rc = dasd_alloc_queue(device->block);
198 dasd_put_device(device);
202 device->state = DASD_STATE_KNOWN;
207 * Let the system forget about a device.
209 static int dasd_state_known_to_new(struct dasd_device *device)
211 /* Disable extended error reporting for this device. */
212 dasd_eer_disable(device);
213 /* Forget the discipline information. */
214 if (device->discipline) {
215 if (device->discipline->uncheck_device)
216 device->discipline->uncheck_device(device);
217 module_put(device->discipline->owner);
219 device->discipline = NULL;
220 if (device->base_discipline)
221 module_put(device->base_discipline->owner);
222 device->base_discipline = NULL;
223 device->state = DASD_STATE_NEW;
226 dasd_free_queue(device->block);
228 /* Give up reference we took in dasd_state_new_to_known. */
229 dasd_put_device(device);
233 static struct dentry *dasd_debugfs_setup(const char *name,
234 struct dentry *base_dentry)
240 pde = debugfs_create_dir(name, base_dentry);
241 if (!pde || IS_ERR(pde))
247 * Request the irq line for the device.
249 static int dasd_state_known_to_basic(struct dasd_device *device)
251 struct dasd_block *block = device->block;
254 /* Allocate and register gendisk structure. */
256 rc = dasd_gendisk_alloc(block);
259 block->debugfs_dentry =
260 dasd_debugfs_setup(block->gdp->disk_name,
261 dasd_debugfs_root_entry);
262 dasd_profile_init(&block->profile, block->debugfs_dentry);
263 if (dasd_global_profile_level == DASD_PROFILE_ON)
264 dasd_profile_on(&device->block->profile);
266 device->debugfs_dentry =
267 dasd_debugfs_setup(dev_name(&device->cdev->dev),
268 dasd_debugfs_root_entry);
269 dasd_profile_init(&device->profile, device->debugfs_dentry);
271 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
272 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1,
274 debug_register_view(device->debug_area, &debug_sprintf_view);
275 debug_set_level(device->debug_area, DBF_WARNING);
276 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
278 device->state = DASD_STATE_BASIC;
284 * Release the irq line for the device. Terminate any running i/o.
286 static int dasd_state_basic_to_known(struct dasd_device *device)
290 if (device->discipline->basic_to_known) {
291 rc = device->discipline->basic_to_known(device);
297 dasd_profile_exit(&device->block->profile);
298 debugfs_remove(device->block->debugfs_dentry);
299 dasd_gendisk_free(device->block);
300 dasd_block_clear_timer(device->block);
302 rc = dasd_flush_device_queue(device);
305 dasd_device_clear_timer(device);
306 dasd_profile_exit(&device->profile);
307 debugfs_remove(device->debugfs_dentry);
308 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
309 if (device->debug_area != NULL) {
310 debug_unregister(device->debug_area);
311 device->debug_area = NULL;
313 device->state = DASD_STATE_KNOWN;
318 * Do the initial analysis. The do_analysis function may return
319 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
320 * until the discipline decides to continue the startup sequence
321 * by calling the function dasd_change_state. The eckd disciplines
322 * uses this to start a ccw that detects the format. The completion
323 * interrupt for this detection ccw uses the kernel event daemon to
324 * trigger the call to dasd_change_state. All this is done in the
325 * discipline code, see dasd_eckd.c.
326 * After the analysis ccw is done (do_analysis returned 0) the block
328 * In case the analysis returns an error, the device setup is stopped
329 * (a fake disk was already added to allow formatting).
331 static int dasd_state_basic_to_ready(struct dasd_device *device)
334 struct dasd_block *block;
337 block = device->block;
338 /* make disk known with correct capacity */
340 if (block->base->discipline->do_analysis != NULL)
341 rc = block->base->discipline->do_analysis(block);
344 device->state = DASD_STATE_UNFMT;
349 dasd_setup_queue(block);
350 set_capacity(block->gdp,
351 block->blocks << block->s2b_shift);
352 device->state = DASD_STATE_READY;
353 rc = dasd_scan_partitions(block);
355 device->state = DASD_STATE_BASIC;
359 device->state = DASD_STATE_READY;
362 if (device->discipline->basic_to_ready)
363 rc = device->discipline->basic_to_ready(device);
368 int _wait_for_empty_queues(struct dasd_device *device)
371 return list_empty(&device->ccw_queue) &&
372 list_empty(&device->block->ccw_queue);
374 return list_empty(&device->ccw_queue);
378 * Remove device from block device layer. Destroy dirty buffers.
379 * Forget format information. Check if the target level is basic
380 * and if it is create fake disk for formatting.
382 static int dasd_state_ready_to_basic(struct dasd_device *device)
386 device->state = DASD_STATE_BASIC;
388 struct dasd_block *block = device->block;
389 rc = dasd_flush_block_queue(block);
391 device->state = DASD_STATE_READY;
394 dasd_flush_request_queue(block);
395 dasd_destroy_partitions(block);
398 block->s2b_shift = 0;
406 static int dasd_state_unfmt_to_basic(struct dasd_device *device)
408 device->state = DASD_STATE_BASIC;
413 * Make the device online and schedule the bottom half to start
414 * the requeueing of requests from the linux request queue to the
418 dasd_state_ready_to_online(struct dasd_device * device)
420 struct gendisk *disk;
421 struct disk_part_iter piter;
422 struct hd_struct *part;
424 device->state = DASD_STATE_ONLINE;
426 dasd_schedule_block_bh(device->block);
427 if ((device->features & DASD_FEATURE_USERAW)) {
428 disk = device->block->gdp;
429 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
432 disk = device->block->bdev->bd_disk;
433 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
434 while ((part = disk_part_iter_next(&piter)))
435 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
436 disk_part_iter_exit(&piter);
442 * Stop the requeueing of requests again.
444 static int dasd_state_online_to_ready(struct dasd_device *device)
447 struct gendisk *disk;
448 struct disk_part_iter piter;
449 struct hd_struct *part;
451 if (device->discipline->online_to_ready) {
452 rc = device->discipline->online_to_ready(device);
457 device->state = DASD_STATE_READY;
458 if (device->block && !(device->features & DASD_FEATURE_USERAW)) {
459 disk = device->block->bdev->bd_disk;
460 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
461 while ((part = disk_part_iter_next(&piter)))
462 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
463 disk_part_iter_exit(&piter);
469 * Device startup state changes.
471 static int dasd_increase_state(struct dasd_device *device)
476 if (device->state == DASD_STATE_NEW &&
477 device->target >= DASD_STATE_KNOWN)
478 rc = dasd_state_new_to_known(device);
481 device->state == DASD_STATE_KNOWN &&
482 device->target >= DASD_STATE_BASIC)
483 rc = dasd_state_known_to_basic(device);
486 device->state == DASD_STATE_BASIC &&
487 device->target >= DASD_STATE_READY)
488 rc = dasd_state_basic_to_ready(device);
491 device->state == DASD_STATE_UNFMT &&
492 device->target > DASD_STATE_UNFMT)
496 device->state == DASD_STATE_READY &&
497 device->target >= DASD_STATE_ONLINE)
498 rc = dasd_state_ready_to_online(device);
504 * Device shutdown state changes.
506 static int dasd_decrease_state(struct dasd_device *device)
511 if (device->state == DASD_STATE_ONLINE &&
512 device->target <= DASD_STATE_READY)
513 rc = dasd_state_online_to_ready(device);
516 device->state == DASD_STATE_READY &&
517 device->target <= DASD_STATE_BASIC)
518 rc = dasd_state_ready_to_basic(device);
521 device->state == DASD_STATE_UNFMT &&
522 device->target <= DASD_STATE_BASIC)
523 rc = dasd_state_unfmt_to_basic(device);
526 device->state == DASD_STATE_BASIC &&
527 device->target <= DASD_STATE_KNOWN)
528 rc = dasd_state_basic_to_known(device);
531 device->state == DASD_STATE_KNOWN &&
532 device->target <= DASD_STATE_NEW)
533 rc = dasd_state_known_to_new(device);
539 * This is the main startup/shutdown routine.
541 static void dasd_change_state(struct dasd_device *device)
545 if (device->state == device->target)
546 /* Already where we want to go today... */
548 if (device->state < device->target)
549 rc = dasd_increase_state(device);
551 rc = dasd_decrease_state(device);
555 device->target = device->state;
557 /* let user-space know that the device status changed */
558 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
560 if (device->state == device->target)
561 wake_up(&dasd_init_waitq);
565 * Kick starter for devices that did not complete the startup/shutdown
566 * procedure or were sleeping because of a pending state.
567 * dasd_kick_device will schedule a call do do_kick_device to the kernel
570 static void do_kick_device(struct work_struct *work)
572 struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
573 mutex_lock(&device->state_mutex);
574 dasd_change_state(device);
575 mutex_unlock(&device->state_mutex);
576 dasd_schedule_device_bh(device);
577 dasd_put_device(device);
580 void dasd_kick_device(struct dasd_device *device)
582 dasd_get_device(device);
583 /* queue call to dasd_kick_device to the kernel event daemon. */
584 if (!schedule_work(&device->kick_work))
585 dasd_put_device(device);
587 EXPORT_SYMBOL(dasd_kick_device);
590 * dasd_reload_device will schedule a call do do_reload_device to the kernel
593 static void do_reload_device(struct work_struct *work)
595 struct dasd_device *device = container_of(work, struct dasd_device,
597 device->discipline->reload(device);
598 dasd_put_device(device);
601 void dasd_reload_device(struct dasd_device *device)
603 dasd_get_device(device);
604 /* queue call to dasd_reload_device to the kernel event daemon. */
605 if (!schedule_work(&device->reload_device))
606 dasd_put_device(device);
608 EXPORT_SYMBOL(dasd_reload_device);
611 * dasd_restore_device will schedule a call do do_restore_device to the kernel
614 static void do_restore_device(struct work_struct *work)
616 struct dasd_device *device = container_of(work, struct dasd_device,
618 device->cdev->drv->restore(device->cdev);
619 dasd_put_device(device);
622 void dasd_restore_device(struct dasd_device *device)
624 dasd_get_device(device);
625 /* queue call to dasd_restore_device to the kernel event daemon. */
626 if (!schedule_work(&device->restore_device))
627 dasd_put_device(device);
631 * Set the target state for a device and starts the state change.
633 void dasd_set_target_state(struct dasd_device *device, int target)
635 dasd_get_device(device);
636 mutex_lock(&device->state_mutex);
637 /* If we are in probeonly mode stop at DASD_STATE_READY. */
638 if (dasd_probeonly && target > DASD_STATE_READY)
639 target = DASD_STATE_READY;
640 if (device->target != target) {
641 if (device->state == target)
642 wake_up(&dasd_init_waitq);
643 device->target = target;
645 if (device->state != device->target)
646 dasd_change_state(device);
647 mutex_unlock(&device->state_mutex);
648 dasd_put_device(device);
650 EXPORT_SYMBOL(dasd_set_target_state);
653 * Enable devices with device numbers in [from..to].
655 static inline int _wait_for_device(struct dasd_device *device)
657 return (device->state == device->target);
660 void dasd_enable_device(struct dasd_device *device)
662 dasd_set_target_state(device, DASD_STATE_ONLINE);
663 if (device->state <= DASD_STATE_KNOWN)
664 /* No discipline for device found. */
665 dasd_set_target_state(device, DASD_STATE_NEW);
666 /* Now wait for the devices to come up. */
667 wait_event(dasd_init_waitq, _wait_for_device(device));
669 dasd_reload_device(device);
670 if (device->discipline->kick_validate)
671 device->discipline->kick_validate(device);
673 EXPORT_SYMBOL(dasd_enable_device);
676 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
679 unsigned int dasd_global_profile_level = DASD_PROFILE_OFF;
681 #ifdef CONFIG_DASD_PROFILE
682 struct dasd_profile dasd_global_profile = {
683 .lock = __SPIN_LOCK_UNLOCKED(dasd_global_profile.lock),
685 static struct dentry *dasd_debugfs_global_entry;
688 * Add profiling information for cqr before execution.
690 static void dasd_profile_start(struct dasd_block *block,
691 struct dasd_ccw_req *cqr,
695 unsigned int counter;
696 struct dasd_device *device;
698 /* count the length of the chanq for statistics */
700 if (dasd_global_profile_level || block->profile.data)
701 list_for_each(l, &block->ccw_queue)
705 spin_lock(&dasd_global_profile.lock);
706 if (dasd_global_profile.data) {
707 dasd_global_profile.data->dasd_io_nr_req[counter]++;
708 if (rq_data_dir(req) == READ)
709 dasd_global_profile.data->dasd_read_nr_req[counter]++;
711 spin_unlock(&dasd_global_profile.lock);
713 spin_lock(&block->profile.lock);
714 if (block->profile.data) {
715 block->profile.data->dasd_io_nr_req[counter]++;
716 if (rq_data_dir(req) == READ)
717 block->profile.data->dasd_read_nr_req[counter]++;
719 spin_unlock(&block->profile.lock);
722 * We count the request for the start device, even though it may run on
723 * some other device due to error recovery. This way we make sure that
724 * we count each request only once.
726 device = cqr->startdev;
727 if (device->profile.data) {
728 counter = 1; /* request is not yet queued on the start device */
729 list_for_each(l, &device->ccw_queue)
733 spin_lock(&device->profile.lock);
734 if (device->profile.data) {
735 device->profile.data->dasd_io_nr_req[counter]++;
736 if (rq_data_dir(req) == READ)
737 device->profile.data->dasd_read_nr_req[counter]++;
739 spin_unlock(&device->profile.lock);
743 * Add profiling information for cqr after execution.
746 #define dasd_profile_counter(value, index) \
748 for (index = 0; index < 31 && value >> (2+index); index++) \
752 static void dasd_profile_end_add_data(struct dasd_profile_info *data,
765 /* in case of an overflow, reset the whole profile */
766 if (data->dasd_io_reqs == UINT_MAX) {
767 memset(data, 0, sizeof(*data));
768 getnstimeofday(&data->starttod);
770 data->dasd_io_reqs++;
771 data->dasd_io_sects += sectors;
773 data->dasd_io_alias++;
777 data->dasd_io_secs[sectors_ind]++;
778 data->dasd_io_times[tottime_ind]++;
779 data->dasd_io_timps[tottimeps_ind]++;
780 data->dasd_io_time1[strtime_ind]++;
781 data->dasd_io_time2[irqtime_ind]++;
782 data->dasd_io_time2ps[irqtimeps_ind]++;
783 data->dasd_io_time3[endtime_ind]++;
786 data->dasd_read_reqs++;
787 data->dasd_read_sects += sectors;
789 data->dasd_read_alias++;
791 data->dasd_read_tpm++;
792 data->dasd_read_secs[sectors_ind]++;
793 data->dasd_read_times[tottime_ind]++;
794 data->dasd_read_time1[strtime_ind]++;
795 data->dasd_read_time2[irqtime_ind]++;
796 data->dasd_read_time3[endtime_ind]++;
800 static void dasd_profile_end(struct dasd_block *block,
801 struct dasd_ccw_req *cqr,
804 long strtime, irqtime, endtime, tottime; /* in microseconds */
805 long tottimeps, sectors;
806 struct dasd_device *device;
807 int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind;
808 int irqtime_ind, irqtimeps_ind, endtime_ind;
810 device = cqr->startdev;
811 if (!(dasd_global_profile_level ||
812 block->profile.data ||
813 device->profile.data))
816 sectors = blk_rq_sectors(req);
817 if (!cqr->buildclk || !cqr->startclk ||
818 !cqr->stopclk || !cqr->endclk ||
822 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
823 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
824 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
825 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
826 tottimeps = tottime / sectors;
828 dasd_profile_counter(sectors, sectors_ind);
829 dasd_profile_counter(tottime, tottime_ind);
830 dasd_profile_counter(tottimeps, tottimeps_ind);
831 dasd_profile_counter(strtime, strtime_ind);
832 dasd_profile_counter(irqtime, irqtime_ind);
833 dasd_profile_counter(irqtime / sectors, irqtimeps_ind);
834 dasd_profile_counter(endtime, endtime_ind);
836 spin_lock(&dasd_global_profile.lock);
837 if (dasd_global_profile.data) {
838 dasd_profile_end_add_data(dasd_global_profile.data,
839 cqr->startdev != block->base,
841 rq_data_dir(req) == READ,
842 sectors, sectors_ind, tottime_ind,
843 tottimeps_ind, strtime_ind,
844 irqtime_ind, irqtimeps_ind,
847 spin_unlock(&dasd_global_profile.lock);
849 spin_lock(&block->profile.lock);
850 if (block->profile.data)
851 dasd_profile_end_add_data(block->profile.data,
852 cqr->startdev != block->base,
854 rq_data_dir(req) == READ,
855 sectors, sectors_ind, tottime_ind,
856 tottimeps_ind, strtime_ind,
857 irqtime_ind, irqtimeps_ind,
859 spin_unlock(&block->profile.lock);
861 spin_lock(&device->profile.lock);
862 if (device->profile.data)
863 dasd_profile_end_add_data(device->profile.data,
864 cqr->startdev != block->base,
866 rq_data_dir(req) == READ,
867 sectors, sectors_ind, tottime_ind,
868 tottimeps_ind, strtime_ind,
869 irqtime_ind, irqtimeps_ind,
871 spin_unlock(&device->profile.lock);
874 void dasd_profile_reset(struct dasd_profile *profile)
876 struct dasd_profile_info *data;
878 spin_lock_bh(&profile->lock);
879 data = profile->data;
881 spin_unlock_bh(&profile->lock);
884 memset(data, 0, sizeof(*data));
885 getnstimeofday(&data->starttod);
886 spin_unlock_bh(&profile->lock);
889 int dasd_profile_on(struct dasd_profile *profile)
891 struct dasd_profile_info *data;
893 data = kzalloc(sizeof(*data), GFP_KERNEL);
896 spin_lock_bh(&profile->lock);
898 spin_unlock_bh(&profile->lock);
902 getnstimeofday(&data->starttod);
903 profile->data = data;
904 spin_unlock_bh(&profile->lock);
908 void dasd_profile_off(struct dasd_profile *profile)
910 spin_lock_bh(&profile->lock);
911 kfree(profile->data);
912 profile->data = NULL;
913 spin_unlock_bh(&profile->lock);
916 char *dasd_get_user_string(const char __user *user_buf, size_t user_len)
920 buffer = vmalloc(user_len + 1);
922 return ERR_PTR(-ENOMEM);
923 if (copy_from_user(buffer, user_buf, user_len) != 0) {
925 return ERR_PTR(-EFAULT);
927 /* got the string, now strip linefeed. */
928 if (buffer[user_len - 1] == '\n')
929 buffer[user_len - 1] = 0;
931 buffer[user_len] = 0;
935 static ssize_t dasd_stats_write(struct file *file,
936 const char __user *user_buf,
937 size_t user_len, loff_t *pos)
941 struct seq_file *m = (struct seq_file *)file->private_data;
942 struct dasd_profile *prof = m->private;
944 if (user_len > 65536)
946 buffer = dasd_get_user_string(user_buf, user_len);
948 return PTR_ERR(buffer);
950 str = skip_spaces(buffer);
952 if (strncmp(str, "reset", 5) == 0) {
953 dasd_profile_reset(prof);
954 } else if (strncmp(str, "on", 2) == 0) {
955 rc = dasd_profile_on(prof);
959 if (prof == &dasd_global_profile) {
960 dasd_profile_reset(prof);
961 dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY;
963 } else if (strncmp(str, "off", 3) == 0) {
964 if (prof == &dasd_global_profile)
965 dasd_global_profile_level = DASD_PROFILE_OFF;
966 dasd_profile_off(prof);
974 static void dasd_stats_array(struct seq_file *m, unsigned int *array)
978 for (i = 0; i < 32; i++)
979 seq_printf(m, "%u ", array[i]);
983 static void dasd_stats_seq_print(struct seq_file *m,
984 struct dasd_profile_info *data)
986 seq_printf(m, "start_time %ld.%09ld\n",
987 data->starttod.tv_sec, data->starttod.tv_nsec);
988 seq_printf(m, "total_requests %u\n", data->dasd_io_reqs);
989 seq_printf(m, "total_sectors %u\n", data->dasd_io_sects);
990 seq_printf(m, "total_pav %u\n", data->dasd_io_alias);
991 seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm);
992 seq_puts(m, "histogram_sectors ");
993 dasd_stats_array(m, data->dasd_io_secs);
994 seq_puts(m, "histogram_io_times ");
995 dasd_stats_array(m, data->dasd_io_times);
996 seq_puts(m, "histogram_io_times_weighted ");
997 dasd_stats_array(m, data->dasd_io_timps);
998 seq_puts(m, "histogram_time_build_to_ssch ");
999 dasd_stats_array(m, data->dasd_io_time1);
1000 seq_puts(m, "histogram_time_ssch_to_irq ");
1001 dasd_stats_array(m, data->dasd_io_time2);
1002 seq_puts(m, "histogram_time_ssch_to_irq_weighted ");
1003 dasd_stats_array(m, data->dasd_io_time2ps);
1004 seq_puts(m, "histogram_time_irq_to_end ");
1005 dasd_stats_array(m, data->dasd_io_time3);
1006 seq_puts(m, "histogram_ccw_queue_length ");
1007 dasd_stats_array(m, data->dasd_io_nr_req);
1008 seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs);
1009 seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects);
1010 seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias);
1011 seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm);
1012 seq_puts(m, "histogram_read_sectors ");
1013 dasd_stats_array(m, data->dasd_read_secs);
1014 seq_puts(m, "histogram_read_times ");
1015 dasd_stats_array(m, data->dasd_read_times);
1016 seq_puts(m, "histogram_read_time_build_to_ssch ");
1017 dasd_stats_array(m, data->dasd_read_time1);
1018 seq_puts(m, "histogram_read_time_ssch_to_irq ");
1019 dasd_stats_array(m, data->dasd_read_time2);
1020 seq_puts(m, "histogram_read_time_irq_to_end ");
1021 dasd_stats_array(m, data->dasd_read_time3);
1022 seq_puts(m, "histogram_read_ccw_queue_length ");
1023 dasd_stats_array(m, data->dasd_read_nr_req);
1026 static int dasd_stats_show(struct seq_file *m, void *v)
1028 struct dasd_profile *profile;
1029 struct dasd_profile_info *data;
1031 profile = m->private;
1032 spin_lock_bh(&profile->lock);
1033 data = profile->data;
1035 spin_unlock_bh(&profile->lock);
1036 seq_puts(m, "disabled\n");
1039 dasd_stats_seq_print(m, data);
1040 spin_unlock_bh(&profile->lock);
1044 static int dasd_stats_open(struct inode *inode, struct file *file)
1046 struct dasd_profile *profile = inode->i_private;
1047 return single_open(file, dasd_stats_show, profile);
1050 static const struct file_operations dasd_stats_raw_fops = {
1051 .owner = THIS_MODULE,
1052 .open = dasd_stats_open,
1054 .llseek = seq_lseek,
1055 .release = single_release,
1056 .write = dasd_stats_write,
1059 static void dasd_profile_init(struct dasd_profile *profile,
1060 struct dentry *base_dentry)
1067 profile->dentry = NULL;
1068 profile->data = NULL;
1069 mode = (S_IRUSR | S_IWUSR | S_IFREG);
1070 pde = debugfs_create_file("statistics", mode, base_dentry,
1071 profile, &dasd_stats_raw_fops);
1072 if (pde && !IS_ERR(pde))
1073 profile->dentry = pde;
1077 static void dasd_profile_exit(struct dasd_profile *profile)
1079 dasd_profile_off(profile);
1080 debugfs_remove(profile->dentry);
1081 profile->dentry = NULL;
1084 static void dasd_statistics_removeroot(void)
1086 dasd_global_profile_level = DASD_PROFILE_OFF;
1087 dasd_profile_exit(&dasd_global_profile);
1088 debugfs_remove(dasd_debugfs_global_entry);
1089 debugfs_remove(dasd_debugfs_root_entry);
1092 static void dasd_statistics_createroot(void)
1096 dasd_debugfs_root_entry = NULL;
1097 pde = debugfs_create_dir("dasd", NULL);
1098 if (!pde || IS_ERR(pde))
1100 dasd_debugfs_root_entry = pde;
1101 pde = debugfs_create_dir("global", dasd_debugfs_root_entry);
1102 if (!pde || IS_ERR(pde))
1104 dasd_debugfs_global_entry = pde;
1105 dasd_profile_init(&dasd_global_profile, dasd_debugfs_global_entry);
1109 DBF_EVENT(DBF_ERR, "%s",
1110 "Creation of the dasd debugfs interface failed");
1111 dasd_statistics_removeroot();
1116 #define dasd_profile_start(block, cqr, req) do {} while (0)
1117 #define dasd_profile_end(block, cqr, req) do {} while (0)
1119 static void dasd_statistics_createroot(void)
1124 static void dasd_statistics_removeroot(void)
1129 int dasd_stats_generic_show(struct seq_file *m, void *v)
1131 seq_puts(m, "Statistics are not activated in this kernel\n");
1135 static void dasd_profile_init(struct dasd_profile *profile,
1136 struct dentry *base_dentry)
1141 static void dasd_profile_exit(struct dasd_profile *profile)
1146 int dasd_profile_on(struct dasd_profile *profile)
1151 #endif /* CONFIG_DASD_PROFILE */
1154 * Allocate memory for a channel program with 'cplength' channel
1155 * command words and 'datasize' additional space. There are two
1156 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
1157 * memory and 2) dasd_smalloc_request uses the static ccw memory
1158 * that gets allocated for each device.
1160 struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
1162 struct dasd_device *device)
1164 struct dasd_ccw_req *cqr;
1167 BUG_ON(datasize > PAGE_SIZE ||
1168 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
1170 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
1172 return ERR_PTR(-ENOMEM);
1175 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
1176 GFP_ATOMIC | GFP_DMA);
1177 if (cqr->cpaddr == NULL) {
1179 return ERR_PTR(-ENOMEM);
1184 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
1185 if (cqr->data == NULL) {
1188 return ERR_PTR(-ENOMEM);
1192 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1193 dasd_get_device(device);
1196 EXPORT_SYMBOL(dasd_kmalloc_request);
1198 struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
1200 struct dasd_device *device)
1202 unsigned long flags;
1203 struct dasd_ccw_req *cqr;
1207 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
1209 size += cplength * sizeof(struct ccw1);
1212 spin_lock_irqsave(&device->mem_lock, flags);
1213 cqr = (struct dasd_ccw_req *)
1214 dasd_alloc_chunk(&device->ccw_chunks, size);
1215 spin_unlock_irqrestore(&device->mem_lock, flags);
1217 return ERR_PTR(-ENOMEM);
1218 memset(cqr, 0, sizeof(struct dasd_ccw_req));
1219 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
1222 cqr->cpaddr = (struct ccw1 *) data;
1223 data += cplength*sizeof(struct ccw1);
1224 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
1229 memset(cqr->data, 0, datasize);
1232 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1233 dasd_get_device(device);
1236 EXPORT_SYMBOL(dasd_smalloc_request);
1239 * Free memory of a channel program. This function needs to free all the
1240 * idal lists that might have been created by dasd_set_cda and the
1241 * struct dasd_ccw_req itself.
1243 void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1247 /* Clear any idals used for the request. */
1250 clear_normalized_cda(ccw);
1251 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
1255 dasd_put_device(device);
1257 EXPORT_SYMBOL(dasd_kfree_request);
1259 void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1261 unsigned long flags;
1263 spin_lock_irqsave(&device->mem_lock, flags);
1264 dasd_free_chunk(&device->ccw_chunks, cqr);
1265 spin_unlock_irqrestore(&device->mem_lock, flags);
1266 dasd_put_device(device);
1268 EXPORT_SYMBOL(dasd_sfree_request);
1271 * Check discipline magic in cqr.
1273 static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
1275 struct dasd_device *device;
1279 device = cqr->startdev;
1280 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
1281 DBF_DEV_EVENT(DBF_WARNING, device,
1282 " dasd_ccw_req 0x%08x magic doesn't match"
1283 " discipline 0x%08x",
1285 *(unsigned int *) device->discipline->name);
1292 * Terminate the current i/o and set the request to clear_pending.
1293 * Timer keeps device runnig.
1294 * ccw_device_clear can fail if the i/o subsystem
1297 int dasd_term_IO(struct dasd_ccw_req *cqr)
1299 struct dasd_device *device;
1301 char errorstring[ERRORLENGTH];
1304 rc = dasd_check_cqr(cqr);
1308 device = (struct dasd_device *) cqr->startdev;
1309 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
1310 rc = ccw_device_clear(device->cdev, (long) cqr);
1312 case 0: /* termination successful */
1313 cqr->status = DASD_CQR_CLEAR_PENDING;
1314 cqr->stopclk = get_tod_clock();
1316 DBF_DEV_EVENT(DBF_DEBUG, device,
1317 "terminate cqr %p successful",
1321 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1322 "device gone, retry");
1325 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1326 "I/O error, retry");
1330 * device not valid so no I/O could be running
1331 * handle CQR as termination successful
1333 cqr->status = DASD_CQR_CLEARED;
1334 cqr->stopclk = get_tod_clock();
1336 /* no retries for invalid devices */
1338 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1339 "EINVAL, handle as terminated");
1340 /* fake rc to success */
1344 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1345 "device busy, retry later");
1348 /* internal error 10 - unknown rc*/
1349 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
1350 dev_err(&device->cdev->dev, "An error occurred in the "
1351 "DASD device driver, reason=%s\n", errorstring);
1357 dasd_schedule_device_bh(device);
1360 EXPORT_SYMBOL(dasd_term_IO);
1363 * Start the i/o. This start_IO can fail if the channel is really busy.
1364 * In that case set up a timer to start the request later.
1366 int dasd_start_IO(struct dasd_ccw_req *cqr)
1368 struct dasd_device *device;
1370 char errorstring[ERRORLENGTH];
1373 rc = dasd_check_cqr(cqr);
1378 device = (struct dasd_device *) cqr->startdev;
1380 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) ||
1381 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) &&
1382 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1383 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p "
1384 "because of stolen lock", cqr);
1385 cqr->status = DASD_CQR_ERROR;
1386 cqr->intrc = -EPERM;
1389 if (cqr->retries < 0) {
1390 /* internal error 14 - start_IO run out of retries */
1391 sprintf(errorstring, "14 %p", cqr);
1392 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1393 "device driver, reason=%s\n", errorstring);
1394 cqr->status = DASD_CQR_ERROR;
1397 cqr->startclk = get_tod_clock();
1398 cqr->starttime = jiffies;
1400 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1401 cqr->lpm &= device->path_data.opm;
1403 cqr->lpm = device->path_data.opm;
1405 if (cqr->cpmode == 1) {
1406 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
1407 (long) cqr, cqr->lpm);
1409 rc = ccw_device_start(device->cdev, cqr->cpaddr,
1410 (long) cqr, cqr->lpm, 0);
1414 cqr->status = DASD_CQR_IN_IO;
1417 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1418 "start_IO: device busy, retry later");
1421 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1422 "start_IO: request timeout, retry later");
1425 /* -EACCES indicates that the request used only a subset of the
1426 * available paths and all these paths are gone. If the lpm of
1427 * this request was only a subset of the opm (e.g. the ppm) then
1428 * we just do a retry with all available paths.
1429 * If we already use the full opm, something is amiss, and we
1430 * need a full path verification.
1432 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1433 DBF_DEV_EVENT(DBF_WARNING, device,
1434 "start_IO: selected paths gone (%x)",
1436 } else if (cqr->lpm != device->path_data.opm) {
1437 cqr->lpm = device->path_data.opm;
1438 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
1439 "start_IO: selected paths gone,"
1440 " retry on all paths");
1442 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1443 "start_IO: all paths in opm gone,"
1444 " do path verification");
1445 dasd_generic_last_path_gone(device);
1446 device->path_data.opm = 0;
1447 device->path_data.ppm = 0;
1448 device->path_data.npm = 0;
1449 device->path_data.tbvpm =
1450 ccw_device_get_path_mask(device->cdev);
1454 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1455 "start_IO: -ENODEV device gone, retry");
1458 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1459 "start_IO: -EIO device gone, retry");
1462 /* most likely caused in power management context */
1463 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1464 "start_IO: -EINVAL device currently "
1468 /* internal error 11 - unknown rc */
1469 snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
1470 dev_err(&device->cdev->dev,
1471 "An error occurred in the DASD device driver, "
1472 "reason=%s\n", errorstring);
1479 EXPORT_SYMBOL(dasd_start_IO);
1482 * Timeout function for dasd devices. This is used for different purposes
1483 * 1) missing interrupt handler for normal operation
1484 * 2) delayed start of request where start_IO failed with -EBUSY
1485 * 3) timeout for missing state change interrupts
1486 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
1487 * DASD_CQR_QUEUED for 2) and 3).
1489 static void dasd_device_timeout(unsigned long ptr)
1491 unsigned long flags;
1492 struct dasd_device *device;
1494 device = (struct dasd_device *) ptr;
1495 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1496 /* re-activate request queue */
1497 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1498 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1499 dasd_schedule_device_bh(device);
1503 * Setup timeout for a device in jiffies.
1505 void dasd_device_set_timer(struct dasd_device *device, int expires)
1508 del_timer(&device->timer);
1510 mod_timer(&device->timer, jiffies + expires);
1512 EXPORT_SYMBOL(dasd_device_set_timer);
1515 * Clear timeout for a device.
1517 void dasd_device_clear_timer(struct dasd_device *device)
1519 del_timer(&device->timer);
1521 EXPORT_SYMBOL(dasd_device_clear_timer);
1523 static void dasd_handle_killed_request(struct ccw_device *cdev,
1524 unsigned long intparm)
1526 struct dasd_ccw_req *cqr;
1527 struct dasd_device *device;
1531 cqr = (struct dasd_ccw_req *) intparm;
1532 if (cqr->status != DASD_CQR_IN_IO) {
1533 DBF_EVENT_DEVID(DBF_DEBUG, cdev,
1534 "invalid status in handle_killed_request: "
1535 "%02x", cqr->status);
1539 device = dasd_device_from_cdev_locked(cdev);
1540 if (IS_ERR(device)) {
1541 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1542 "unable to get device from cdev");
1546 if (!cqr->startdev ||
1547 device != cqr->startdev ||
1548 strncmp(cqr->startdev->discipline->ebcname,
1549 (char *) &cqr->magic, 4)) {
1550 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1551 "invalid device in request");
1552 dasd_put_device(device);
1556 /* Schedule request to be retried. */
1557 cqr->status = DASD_CQR_QUEUED;
1559 dasd_device_clear_timer(device);
1560 dasd_schedule_device_bh(device);
1561 dasd_put_device(device);
1564 void dasd_generic_handle_state_change(struct dasd_device *device)
1566 /* First of all start sense subsystem status request. */
1567 dasd_eer_snss(device);
1569 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1570 dasd_schedule_device_bh(device);
1572 dasd_schedule_block_bh(device->block);
1574 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
1577 * Interrupt handler for "normal" ssch-io based dasd devices.
1579 void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1582 struct dasd_ccw_req *cqr, *next;
1583 struct dasd_device *device;
1584 unsigned long long now;
1588 switch (PTR_ERR(irb)) {
1592 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1593 "request timed out\n", __func__);
1596 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1597 "unknown error %ld\n", __func__,
1600 dasd_handle_killed_request(cdev, intparm);
1604 now = get_tod_clock();
1605 cqr = (struct dasd_ccw_req *) intparm;
1606 /* check for conditions that should be handled immediately */
1608 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1609 scsw_cstat(&irb->scsw) == 0)) {
1611 memcpy(&cqr->irb, irb, sizeof(*irb));
1612 device = dasd_device_from_cdev_locked(cdev);
1615 /* ignore unsolicited interrupts for DIAG discipline */
1616 if (device->discipline == dasd_diag_discipline_pointer) {
1617 dasd_put_device(device);
1620 device->discipline->dump_sense_dbf(device, irb, "int");
1621 if (device->features & DASD_FEATURE_ERPLOG)
1622 device->discipline->dump_sense(device, cqr, irb);
1623 device->discipline->check_for_device_change(device, cqr, irb);
1624 dasd_put_device(device);
1627 /* check for for attention message */
1628 if (scsw_dstat(&irb->scsw) & DEV_STAT_ATTENTION) {
1629 device = dasd_device_from_cdev_locked(cdev);
1630 device->discipline->check_attention(device, irb->esw.esw1.lpum);
1631 dasd_put_device(device);
1637 device = (struct dasd_device *) cqr->startdev;
1639 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
1640 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1641 "invalid device in request");
1645 /* Check for clear pending */
1646 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
1647 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
1648 cqr->status = DASD_CQR_CLEARED;
1649 dasd_device_clear_timer(device);
1650 wake_up(&dasd_flush_wq);
1651 dasd_schedule_device_bh(device);
1655 /* check status - the request might have been killed by dyn detach */
1656 if (cqr->status != DASD_CQR_IN_IO) {
1657 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1658 "status %02x", dev_name(&cdev->dev), cqr->status);
1664 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1665 scsw_cstat(&irb->scsw) == 0) {
1666 /* request was completed successfully */
1667 cqr->status = DASD_CQR_SUCCESS;
1669 /* Start first request on queue if possible -> fast_io. */
1670 if (cqr->devlist.next != &device->ccw_queue) {
1671 next = list_entry(cqr->devlist.next,
1672 struct dasd_ccw_req, devlist);
1674 } else { /* error */
1676 * If we don't want complex ERP for this request, then just
1677 * reset this and retry it in the fastpath
1679 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
1681 if (cqr->lpm == device->path_data.opm)
1682 DBF_DEV_EVENT(DBF_DEBUG, device,
1683 "default ERP in fastpath "
1684 "(%i retries left)",
1686 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
1687 cqr->lpm = device->path_data.opm;
1688 cqr->status = DASD_CQR_QUEUED;
1691 cqr->status = DASD_CQR_ERROR;
1693 if (next && (next->status == DASD_CQR_QUEUED) &&
1694 (!device->stopped)) {
1695 if (device->discipline->start_IO(next) == 0)
1696 expires = next->expires;
1699 dasd_device_set_timer(device, expires);
1701 dasd_device_clear_timer(device);
1702 dasd_schedule_device_bh(device);
1704 EXPORT_SYMBOL(dasd_int_handler);
1706 enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
1708 struct dasd_device *device;
1710 device = dasd_device_from_cdev_locked(cdev);
1714 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1715 device->state != device->target ||
1716 !device->discipline->check_for_device_change){
1717 dasd_put_device(device);
1720 if (device->discipline->dump_sense_dbf)
1721 device->discipline->dump_sense_dbf(device, irb, "uc");
1722 device->discipline->check_for_device_change(device, NULL, irb);
1723 dasd_put_device(device);
1725 return UC_TODO_RETRY;
1727 EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
1730 * If we have an error on a dasd_block layer request then we cancel
1731 * and return all further requests from the same dasd_block as well.
1733 static void __dasd_device_recovery(struct dasd_device *device,
1734 struct dasd_ccw_req *ref_cqr)
1736 struct list_head *l, *n;
1737 struct dasd_ccw_req *cqr;
1740 * only requeue request that came from the dasd_block layer
1742 if (!ref_cqr->block)
1745 list_for_each_safe(l, n, &device->ccw_queue) {
1746 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1747 if (cqr->status == DASD_CQR_QUEUED &&
1748 ref_cqr->block == cqr->block) {
1749 cqr->status = DASD_CQR_CLEARED;
1755 * Remove those ccw requests from the queue that need to be returned
1756 * to the upper layer.
1758 static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1759 struct list_head *final_queue)
1761 struct list_head *l, *n;
1762 struct dasd_ccw_req *cqr;
1764 /* Process request with final status. */
1765 list_for_each_safe(l, n, &device->ccw_queue) {
1766 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1768 /* Skip any non-final request. */
1769 if (cqr->status == DASD_CQR_QUEUED ||
1770 cqr->status == DASD_CQR_IN_IO ||
1771 cqr->status == DASD_CQR_CLEAR_PENDING)
1773 if (cqr->status == DASD_CQR_ERROR) {
1774 __dasd_device_recovery(device, cqr);
1776 /* Rechain finished requests to final queue */
1777 list_move_tail(&cqr->devlist, final_queue);
1782 * the cqrs from the final queue are returned to the upper layer
1783 * by setting a dasd_block state and calling the callback function
1785 static void __dasd_device_process_final_queue(struct dasd_device *device,
1786 struct list_head *final_queue)
1788 struct list_head *l, *n;
1789 struct dasd_ccw_req *cqr;
1790 struct dasd_block *block;
1791 void (*callback)(struct dasd_ccw_req *, void *data);
1792 void *callback_data;
1793 char errorstring[ERRORLENGTH];
1795 list_for_each_safe(l, n, final_queue) {
1796 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1797 list_del_init(&cqr->devlist);
1799 callback = cqr->callback;
1800 callback_data = cqr->callback_data;
1802 spin_lock_bh(&block->queue_lock);
1803 switch (cqr->status) {
1804 case DASD_CQR_SUCCESS:
1805 cqr->status = DASD_CQR_DONE;
1807 case DASD_CQR_ERROR:
1808 cqr->status = DASD_CQR_NEED_ERP;
1810 case DASD_CQR_CLEARED:
1811 cqr->status = DASD_CQR_TERMINATED;
1814 /* internal error 12 - wrong cqr status*/
1815 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1816 dev_err(&device->cdev->dev,
1817 "An error occurred in the DASD device driver, "
1818 "reason=%s\n", errorstring);
1821 if (cqr->callback != NULL)
1822 (callback)(cqr, callback_data);
1824 spin_unlock_bh(&block->queue_lock);
1829 * Take a look at the first request on the ccw queue and check
1830 * if it reached its expire time. If so, terminate the IO.
1832 static void __dasd_device_check_expire(struct dasd_device *device)
1834 struct dasd_ccw_req *cqr;
1836 if (list_empty(&device->ccw_queue))
1838 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1839 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1840 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
1841 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
1843 * IO in safe offline processing should not
1844 * run out of retries
1848 if (device->discipline->term_IO(cqr) != 0) {
1849 /* Hmpf, try again in 5 sec */
1850 dev_err(&device->cdev->dev,
1851 "cqr %p timed out (%lus) but cannot be "
1852 "ended, retrying in 5 s\n",
1853 cqr, (cqr->expires/HZ));
1854 cqr->expires += 5*HZ;
1855 dasd_device_set_timer(device, 5*HZ);
1857 dev_err(&device->cdev->dev,
1858 "cqr %p timed out (%lus), %i retries "
1859 "remaining\n", cqr, (cqr->expires/HZ),
1866 * Take a look at the first request on the ccw queue and check
1867 * if it needs to be started.
1869 static void __dasd_device_start_head(struct dasd_device *device)
1871 struct dasd_ccw_req *cqr;
1874 if (list_empty(&device->ccw_queue))
1876 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1877 if (cqr->status != DASD_CQR_QUEUED)
1879 /* when device is stopped, return request to previous layer
1880 * exception: only the disconnect or unresumed bits are set and the
1881 * cqr is a path verification request
1883 if (device->stopped &&
1884 !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
1885 && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) {
1886 cqr->intrc = -EAGAIN;
1887 cqr->status = DASD_CQR_CLEARED;
1888 dasd_schedule_device_bh(device);
1892 rc = device->discipline->start_IO(cqr);
1894 dasd_device_set_timer(device, cqr->expires);
1895 else if (rc == -EACCES) {
1896 dasd_schedule_device_bh(device);
1898 /* Hmpf, try again in 1/2 sec */
1899 dasd_device_set_timer(device, 50);
1902 static void __dasd_device_check_path_events(struct dasd_device *device)
1906 if (device->path_data.tbvpm) {
1907 if (device->stopped & ~(DASD_STOPPED_DC_WAIT |
1910 rc = device->discipline->verify_path(
1911 device, device->path_data.tbvpm);
1913 dasd_device_set_timer(device, 50);
1915 device->path_data.tbvpm = 0;
1920 * Go through all request on the dasd_device request queue,
1921 * terminate them on the cdev if necessary, and return them to the
1922 * submitting layer via callback.
1924 * Make sure that all 'submitting layers' still exist when
1925 * this function is called!. In other words, when 'device' is a base
1926 * device then all block layer requests must have been removed before
1927 * via dasd_flush_block_queue.
1929 int dasd_flush_device_queue(struct dasd_device *device)
1931 struct dasd_ccw_req *cqr, *n;
1933 struct list_head flush_queue;
1935 INIT_LIST_HEAD(&flush_queue);
1936 spin_lock_irq(get_ccwdev_lock(device->cdev));
1938 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
1939 /* Check status and move request to flush_queue */
1940 switch (cqr->status) {
1941 case DASD_CQR_IN_IO:
1942 rc = device->discipline->term_IO(cqr);
1944 /* unable to terminate requeust */
1945 dev_err(&device->cdev->dev,
1946 "Flushing the DASD request queue "
1947 "failed for request %p\n", cqr);
1948 /* stop flush processing */
1952 case DASD_CQR_QUEUED:
1953 cqr->stopclk = get_tod_clock();
1954 cqr->status = DASD_CQR_CLEARED;
1956 default: /* no need to modify the others */
1959 list_move_tail(&cqr->devlist, &flush_queue);
1962 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1964 * After this point all requests must be in state CLEAR_PENDING,
1965 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
1966 * one of the others.
1968 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
1969 wait_event(dasd_flush_wq,
1970 (cqr->status != DASD_CQR_CLEAR_PENDING));
1972 * Now set each request back to TERMINATED, DONE or NEED_ERP
1973 * and call the callback function of flushed requests
1975 __dasd_device_process_final_queue(device, &flush_queue);
1978 EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
1981 * Acquire the device lock and process queues for the device.
1983 static void dasd_device_tasklet(struct dasd_device *device)
1985 struct list_head final_queue;
1987 atomic_set (&device->tasklet_scheduled, 0);
1988 INIT_LIST_HEAD(&final_queue);
1989 spin_lock_irq(get_ccwdev_lock(device->cdev));
1990 /* Check expire time of first request on the ccw queue. */
1991 __dasd_device_check_expire(device);
1992 /* find final requests on ccw queue */
1993 __dasd_device_process_ccw_queue(device, &final_queue);
1994 __dasd_device_check_path_events(device);
1995 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1996 /* Now call the callback function of requests with final status */
1997 __dasd_device_process_final_queue(device, &final_queue);
1998 spin_lock_irq(get_ccwdev_lock(device->cdev));
1999 /* Now check if the head of the ccw queue needs to be started. */
2000 __dasd_device_start_head(device);
2001 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2002 if (waitqueue_active(&shutdown_waitq))
2003 wake_up(&shutdown_waitq);
2004 dasd_put_device(device);
2008 * Schedules a call to dasd_tasklet over the device tasklet.
2010 void dasd_schedule_device_bh(struct dasd_device *device)
2012 /* Protect against rescheduling. */
2013 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
2015 dasd_get_device(device);
2016 tasklet_hi_schedule(&device->tasklet);
2018 EXPORT_SYMBOL(dasd_schedule_device_bh);
2020 void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
2022 device->stopped |= bits;
2024 EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
2026 void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
2028 device->stopped &= ~bits;
2029 if (!device->stopped)
2030 wake_up(&generic_waitq);
2032 EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
2035 * Queue a request to the head of the device ccw_queue.
2036 * Start the I/O if possible.
2038 void dasd_add_request_head(struct dasd_ccw_req *cqr)
2040 struct dasd_device *device;
2041 unsigned long flags;
2043 device = cqr->startdev;
2044 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2045 cqr->status = DASD_CQR_QUEUED;
2046 list_add(&cqr->devlist, &device->ccw_queue);
2047 /* let the bh start the request to keep them in order */
2048 dasd_schedule_device_bh(device);
2049 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2051 EXPORT_SYMBOL(dasd_add_request_head);
2054 * Queue a request to the tail of the device ccw_queue.
2055 * Start the I/O if possible.
2057 void dasd_add_request_tail(struct dasd_ccw_req *cqr)
2059 struct dasd_device *device;
2060 unsigned long flags;
2062 device = cqr->startdev;
2063 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2064 cqr->status = DASD_CQR_QUEUED;
2065 list_add_tail(&cqr->devlist, &device->ccw_queue);
2066 /* let the bh start the request to keep them in order */
2067 dasd_schedule_device_bh(device);
2068 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2070 EXPORT_SYMBOL(dasd_add_request_tail);
2073 * Wakeup helper for the 'sleep_on' functions.
2075 void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
2077 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2078 cqr->callback_data = DASD_SLEEPON_END_TAG;
2079 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2080 wake_up(&generic_waitq);
2082 EXPORT_SYMBOL_GPL(dasd_wakeup_cb);
2084 static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
2086 struct dasd_device *device;
2089 device = cqr->startdev;
2090 spin_lock_irq(get_ccwdev_lock(device->cdev));
2091 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
2092 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2097 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
2099 static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
2101 struct dasd_device *device;
2102 dasd_erp_fn_t erp_fn;
2104 if (cqr->status == DASD_CQR_FILLED)
2106 device = cqr->startdev;
2107 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2108 if (cqr->status == DASD_CQR_TERMINATED) {
2109 device->discipline->handle_terminated_request(cqr);
2112 if (cqr->status == DASD_CQR_NEED_ERP) {
2113 erp_fn = device->discipline->erp_action(cqr);
2117 if (cqr->status == DASD_CQR_FAILED)
2118 dasd_log_sense(cqr, &cqr->irb);
2120 __dasd_process_erp(device, cqr);
2127 static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
2129 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2130 if (cqr->refers) /* erp is not done yet */
2132 return ((cqr->status != DASD_CQR_DONE) &&
2133 (cqr->status != DASD_CQR_FAILED));
2135 return (cqr->status == DASD_CQR_FILLED);
2138 static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
2140 struct dasd_device *device;
2142 struct list_head ccw_queue;
2143 struct dasd_ccw_req *cqr;
2145 INIT_LIST_HEAD(&ccw_queue);
2146 maincqr->status = DASD_CQR_FILLED;
2147 device = maincqr->startdev;
2148 list_add(&maincqr->blocklist, &ccw_queue);
2149 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
2150 cqr = list_first_entry(&ccw_queue,
2151 struct dasd_ccw_req, blocklist)) {
2153 if (__dasd_sleep_on_erp(cqr))
2155 if (cqr->status != DASD_CQR_FILLED) /* could be failed */
2157 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2158 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2159 cqr->status = DASD_CQR_FAILED;
2160 cqr->intrc = -EPERM;
2163 /* Non-temporary stop condition will trigger fail fast */
2164 if (device->stopped & ~DASD_STOPPED_PENDING &&
2165 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2166 (!dasd_eer_enabled(device))) {
2167 cqr->status = DASD_CQR_FAILED;
2168 cqr->intrc = -ENOLINK;
2172 * Don't try to start requests if device is stopped
2173 * except path verification requests
2175 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
2176 if (interruptible) {
2177 rc = wait_event_interruptible(
2178 generic_waitq, !(device->stopped));
2179 if (rc == -ERESTARTSYS) {
2180 cqr->status = DASD_CQR_FAILED;
2181 maincqr->intrc = rc;
2185 wait_event(generic_waitq, !(device->stopped));
2188 cqr->callback = dasd_wakeup_cb;
2190 cqr->callback_data = DASD_SLEEPON_START_TAG;
2191 dasd_add_request_tail(cqr);
2192 if (interruptible) {
2193 rc = wait_event_interruptible(
2194 generic_waitq, _wait_for_wakeup(cqr));
2195 if (rc == -ERESTARTSYS) {
2196 dasd_cancel_req(cqr);
2197 /* wait (non-interruptible) for final status */
2198 wait_event(generic_waitq,
2199 _wait_for_wakeup(cqr));
2200 cqr->status = DASD_CQR_FAILED;
2201 maincqr->intrc = rc;
2205 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2208 maincqr->endclk = get_tod_clock();
2209 if ((maincqr->status != DASD_CQR_DONE) &&
2210 (maincqr->intrc != -ERESTARTSYS))
2211 dasd_log_sense(maincqr, &maincqr->irb);
2212 if (maincqr->status == DASD_CQR_DONE)
2214 else if (maincqr->intrc)
2215 rc = maincqr->intrc;
2221 static inline int _wait_for_wakeup_queue(struct list_head *ccw_queue)
2223 struct dasd_ccw_req *cqr;
2225 list_for_each_entry(cqr, ccw_queue, blocklist) {
2226 if (cqr->callback_data != DASD_SLEEPON_END_TAG)
2233 static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible)
2235 struct dasd_device *device;
2236 struct dasd_ccw_req *cqr, *n;
2240 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2241 device = cqr->startdev;
2242 if (cqr->status != DASD_CQR_FILLED) /*could be failed*/
2245 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2246 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2247 cqr->status = DASD_CQR_FAILED;
2248 cqr->intrc = -EPERM;
2251 /*Non-temporary stop condition will trigger fail fast*/
2252 if (device->stopped & ~DASD_STOPPED_PENDING &&
2253 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2254 !dasd_eer_enabled(device)) {
2255 cqr->status = DASD_CQR_FAILED;
2256 cqr->intrc = -EAGAIN;
2260 /*Don't try to start requests if device is stopped*/
2261 if (interruptible) {
2262 rc = wait_event_interruptible(
2263 generic_waitq, !device->stopped);
2264 if (rc == -ERESTARTSYS) {
2265 cqr->status = DASD_CQR_FAILED;
2270 wait_event(generic_waitq, !(device->stopped));
2273 cqr->callback = dasd_wakeup_cb;
2274 cqr->callback_data = DASD_SLEEPON_START_TAG;
2275 dasd_add_request_tail(cqr);
2278 wait_event(generic_waitq, _wait_for_wakeup_queue(ccw_queue));
2281 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2283 * for alias devices simplify error recovery and
2284 * return to upper layer
2285 * do not skip ERP requests
2287 if (cqr->startdev != cqr->basedev && !cqr->refers &&
2288 (cqr->status == DASD_CQR_TERMINATED ||
2289 cqr->status == DASD_CQR_NEED_ERP))
2292 /* normal recovery for basedev IO */
2293 if (__dasd_sleep_on_erp(cqr))
2294 /* handle erp first */
2302 * Queue a request to the tail of the device ccw_queue and wait for
2305 int dasd_sleep_on(struct dasd_ccw_req *cqr)
2307 return _dasd_sleep_on(cqr, 0);
2309 EXPORT_SYMBOL(dasd_sleep_on);
2312 * Start requests from a ccw_queue and wait for their completion.
2314 int dasd_sleep_on_queue(struct list_head *ccw_queue)
2316 return _dasd_sleep_on_queue(ccw_queue, 0);
2318 EXPORT_SYMBOL(dasd_sleep_on_queue);
2321 * Queue a request to the tail of the device ccw_queue and wait
2322 * interruptible for it's completion.
2324 int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
2326 return _dasd_sleep_on(cqr, 1);
2328 EXPORT_SYMBOL(dasd_sleep_on_interruptible);
2331 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
2332 * for eckd devices) the currently running request has to be terminated
2333 * and be put back to status queued, before the special request is added
2334 * to the head of the queue. Then the special request is waited on normally.
2336 static inline int _dasd_term_running_cqr(struct dasd_device *device)
2338 struct dasd_ccw_req *cqr;
2341 if (list_empty(&device->ccw_queue))
2343 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
2344 rc = device->discipline->term_IO(cqr);
2347 * CQR terminated because a more important request is pending.
2348 * Undo decreasing of retry counter because this is
2349 * not an error case.
2355 int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
2357 struct dasd_device *device;
2360 device = cqr->startdev;
2361 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2362 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2363 cqr->status = DASD_CQR_FAILED;
2364 cqr->intrc = -EPERM;
2367 spin_lock_irq(get_ccwdev_lock(device->cdev));
2368 rc = _dasd_term_running_cqr(device);
2370 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2373 cqr->callback = dasd_wakeup_cb;
2374 cqr->callback_data = DASD_SLEEPON_START_TAG;
2375 cqr->status = DASD_CQR_QUEUED;
2377 * add new request as second
2378 * first the terminated cqr needs to be finished
2380 list_add(&cqr->devlist, device->ccw_queue.next);
2382 /* let the bh start the request to keep them in order */
2383 dasd_schedule_device_bh(device);
2385 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2387 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2389 if (cqr->status == DASD_CQR_DONE)
2391 else if (cqr->intrc)
2397 dasd_schedule_device_bh(device);
2399 dasd_schedule_block_bh(device->block);
2403 EXPORT_SYMBOL(dasd_sleep_on_immediatly);
2406 * Cancels a request that was started with dasd_sleep_on_req.
2407 * This is useful to timeout requests. The request will be
2408 * terminated if it is currently in i/o.
2409 * Returns 0 if request termination was successful
2410 * negative error code if termination failed
2411 * Cancellation of a request is an asynchronous operation! The calling
2412 * function has to wait until the request is properly returned via callback.
2414 int dasd_cancel_req(struct dasd_ccw_req *cqr)
2416 struct dasd_device *device = cqr->startdev;
2417 unsigned long flags;
2421 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2422 switch (cqr->status) {
2423 case DASD_CQR_QUEUED:
2424 /* request was not started - just set to cleared */
2425 cqr->status = DASD_CQR_CLEARED;
2426 if (cqr->callback_data == DASD_SLEEPON_START_TAG)
2427 cqr->callback_data = DASD_SLEEPON_END_TAG;
2429 case DASD_CQR_IN_IO:
2430 /* request in IO - terminate IO and release again */
2431 rc = device->discipline->term_IO(cqr);
2433 dev_err(&device->cdev->dev,
2434 "Cancelling request %p failed with rc=%d\n",
2437 cqr->stopclk = get_tod_clock();
2440 default: /* already finished or clear pending - do nothing */
2443 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2444 dasd_schedule_device_bh(device);
2447 EXPORT_SYMBOL(dasd_cancel_req);
2450 * SECTION: Operations of the dasd_block layer.
2454 * Timeout function for dasd_block. This is used when the block layer
2455 * is waiting for something that may not come reliably, (e.g. a state
2458 static void dasd_block_timeout(unsigned long ptr)
2460 unsigned long flags;
2461 struct dasd_block *block;
2463 block = (struct dasd_block *) ptr;
2464 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
2465 /* re-activate request queue */
2466 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
2467 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
2468 dasd_schedule_block_bh(block);
2472 * Setup timeout for a dasd_block in jiffies.
2474 void dasd_block_set_timer(struct dasd_block *block, int expires)
2477 del_timer(&block->timer);
2479 mod_timer(&block->timer, jiffies + expires);
2481 EXPORT_SYMBOL(dasd_block_set_timer);
2484 * Clear timeout for a dasd_block.
2486 void dasd_block_clear_timer(struct dasd_block *block)
2488 del_timer(&block->timer);
2490 EXPORT_SYMBOL(dasd_block_clear_timer);
2493 * Process finished error recovery ccw.
2495 static void __dasd_process_erp(struct dasd_device *device,
2496 struct dasd_ccw_req *cqr)
2498 dasd_erp_fn_t erp_fn;
2500 if (cqr->status == DASD_CQR_DONE)
2501 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
2503 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
2504 erp_fn = device->discipline->erp_postaction(cqr);
2509 * Fetch requests from the block device queue.
2511 static void __dasd_process_request_queue(struct dasd_block *block)
2513 struct request_queue *queue;
2514 struct request *req;
2515 struct dasd_ccw_req *cqr;
2516 struct dasd_device *basedev;
2517 unsigned long flags;
2518 queue = block->request_queue;
2519 basedev = block->base;
2520 /* No queue ? Then there is nothing to do. */
2525 * We requeue request from the block device queue to the ccw
2526 * queue only in two states. In state DASD_STATE_READY the
2527 * partition detection is done and we need to requeue requests
2528 * for that. State DASD_STATE_ONLINE is normal block device
2531 if (basedev->state < DASD_STATE_READY) {
2532 while ((req = blk_fetch_request(block->request_queue)))
2533 __blk_end_request_all(req, -EIO);
2537 /* if device ist stopped do not fetch new requests */
2538 if (basedev->stopped)
2541 /* Now we try to fetch requests from the request queue */
2542 while ((req = blk_peek_request(queue))) {
2543 if (basedev->features & DASD_FEATURE_READONLY &&
2544 rq_data_dir(req) == WRITE) {
2545 DBF_DEV_EVENT(DBF_ERR, basedev,
2546 "Rejecting write request %p",
2548 blk_start_request(req);
2549 __blk_end_request_all(req, -EIO);
2552 if (test_bit(DASD_FLAG_ABORTALL, &basedev->flags) &&
2553 (basedev->features & DASD_FEATURE_FAILFAST ||
2554 blk_noretry_request(req))) {
2555 DBF_DEV_EVENT(DBF_ERR, basedev,
2556 "Rejecting failfast request %p",
2558 blk_start_request(req);
2559 __blk_end_request_all(req, -ETIMEDOUT);
2562 cqr = basedev->discipline->build_cp(basedev, block, req);
2564 if (PTR_ERR(cqr) == -EBUSY)
2565 break; /* normal end condition */
2566 if (PTR_ERR(cqr) == -ENOMEM)
2567 break; /* terminate request queue loop */
2568 if (PTR_ERR(cqr) == -EAGAIN) {
2570 * The current request cannot be build right
2571 * now, we have to try later. If this request
2572 * is the head-of-queue we stop the device
2575 if (!list_empty(&block->ccw_queue))
2578 get_ccwdev_lock(basedev->cdev), flags);
2579 dasd_device_set_stop_bits(basedev,
2580 DASD_STOPPED_PENDING);
2581 spin_unlock_irqrestore(
2582 get_ccwdev_lock(basedev->cdev), flags);
2583 dasd_block_set_timer(block, HZ/2);
2586 DBF_DEV_EVENT(DBF_ERR, basedev,
2587 "CCW creation failed (rc=%ld) "
2590 blk_start_request(req);
2591 __blk_end_request_all(req, -EIO);
2595 * Note: callback is set to dasd_return_cqr_cb in
2596 * __dasd_block_start_head to cover erp requests as well
2598 cqr->callback_data = (void *) req;
2599 cqr->status = DASD_CQR_FILLED;
2600 req->completion_data = cqr;
2601 blk_start_request(req);
2602 list_add_tail(&cqr->blocklist, &block->ccw_queue);
2603 INIT_LIST_HEAD(&cqr->devlist);
2604 dasd_profile_start(block, cqr, req);
2608 static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
2610 struct request *req;
2614 req = (struct request *) cqr->callback_data;
2615 dasd_profile_end(cqr->block, cqr, req);
2616 status = cqr->block->base->discipline->free_cp(cqr, req);
2619 else if (status == 0) {
2620 if (cqr->intrc == -EPERM)
2622 else if (cqr->intrc == -ENOLINK ||
2623 cqr->intrc == -ETIMEDOUT)
2628 __blk_end_request_all(req, error);
2632 * Process ccw request queue.
2634 static void __dasd_process_block_ccw_queue(struct dasd_block *block,
2635 struct list_head *final_queue)
2637 struct list_head *l, *n;
2638 struct dasd_ccw_req *cqr;
2639 dasd_erp_fn_t erp_fn;
2640 unsigned long flags;
2641 struct dasd_device *base = block->base;
2644 /* Process request with final status. */
2645 list_for_each_safe(l, n, &block->ccw_queue) {
2646 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2647 if (cqr->status != DASD_CQR_DONE &&
2648 cqr->status != DASD_CQR_FAILED &&
2649 cqr->status != DASD_CQR_NEED_ERP &&
2650 cqr->status != DASD_CQR_TERMINATED)
2653 if (cqr->status == DASD_CQR_TERMINATED) {
2654 base->discipline->handle_terminated_request(cqr);
2658 /* Process requests that may be recovered */
2659 if (cqr->status == DASD_CQR_NEED_ERP) {
2660 erp_fn = base->discipline->erp_action(cqr);
2661 if (IS_ERR(erp_fn(cqr)))
2666 /* log sense for fatal error */
2667 if (cqr->status == DASD_CQR_FAILED) {
2668 dasd_log_sense(cqr, &cqr->irb);
2671 /* First of all call extended error reporting. */
2672 if (dasd_eer_enabled(base) &&
2673 cqr->status == DASD_CQR_FAILED) {
2674 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
2676 /* restart request */
2677 cqr->status = DASD_CQR_FILLED;
2679 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
2680 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
2681 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
2686 /* Process finished ERP request. */
2688 __dasd_process_erp(base, cqr);
2692 /* Rechain finished requests to final queue */
2693 cqr->endclk = get_tod_clock();
2694 list_move_tail(&cqr->blocklist, final_queue);
2698 static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
2700 dasd_schedule_block_bh(cqr->block);
2703 static void __dasd_block_start_head(struct dasd_block *block)
2705 struct dasd_ccw_req *cqr;
2707 if (list_empty(&block->ccw_queue))
2709 /* We allways begin with the first requests on the queue, as some
2710 * of previously started requests have to be enqueued on a
2711 * dasd_device again for error recovery.
2713 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
2714 if (cqr->status != DASD_CQR_FILLED)
2716 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
2717 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2718 cqr->status = DASD_CQR_FAILED;
2719 cqr->intrc = -EPERM;
2720 dasd_schedule_block_bh(block);
2723 /* Non-temporary stop condition will trigger fail fast */
2724 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
2725 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2726 (!dasd_eer_enabled(block->base))) {
2727 cqr->status = DASD_CQR_FAILED;
2728 cqr->intrc = -ENOLINK;
2729 dasd_schedule_block_bh(block);
2732 /* Don't try to start requests if device is stopped */
2733 if (block->base->stopped)
2736 /* just a fail safe check, should not happen */
2738 cqr->startdev = block->base;
2740 /* make sure that the requests we submit find their way back */
2741 cqr->callback = dasd_return_cqr_cb;
2743 dasd_add_request_tail(cqr);
2748 * Central dasd_block layer routine. Takes requests from the generic
2749 * block layer request queue, creates ccw requests, enqueues them on
2750 * a dasd_device and processes ccw requests that have been returned.
2752 static void dasd_block_tasklet(struct dasd_block *block)
2754 struct list_head final_queue;
2755 struct list_head *l, *n;
2756 struct dasd_ccw_req *cqr;
2758 atomic_set(&block->tasklet_scheduled, 0);
2759 INIT_LIST_HEAD(&final_queue);
2760 spin_lock(&block->queue_lock);
2761 /* Finish off requests on ccw queue */
2762 __dasd_process_block_ccw_queue(block, &final_queue);
2763 spin_unlock(&block->queue_lock);
2764 /* Now call the callback function of requests with final status */
2765 spin_lock_irq(&block->request_queue_lock);
2766 list_for_each_safe(l, n, &final_queue) {
2767 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2768 list_del_init(&cqr->blocklist);
2769 __dasd_cleanup_cqr(cqr);
2771 spin_lock(&block->queue_lock);
2772 /* Get new request from the block device request queue */
2773 __dasd_process_request_queue(block);
2774 /* Now check if the head of the ccw queue needs to be started. */
2775 __dasd_block_start_head(block);
2776 spin_unlock(&block->queue_lock);
2777 spin_unlock_irq(&block->request_queue_lock);
2778 if (waitqueue_active(&shutdown_waitq))
2779 wake_up(&shutdown_waitq);
2780 dasd_put_device(block->base);
2783 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2785 wake_up(&dasd_flush_wq);
2789 * Requeue a request back to the block request queue
2790 * only works for block requests
2792 static int _dasd_requeue_request(struct dasd_ccw_req *cqr)
2794 struct dasd_block *block = cqr->block;
2795 struct request *req;
2796 unsigned long flags;
2800 spin_lock_irqsave(&block->queue_lock, flags);
2801 req = (struct request *) cqr->callback_data;
2802 blk_requeue_request(block->request_queue, req);
2803 spin_unlock_irqrestore(&block->queue_lock, flags);
2809 * Go through all request on the dasd_block request queue, cancel them
2810 * on the respective dasd_device, and return them to the generic
2813 static int dasd_flush_block_queue(struct dasd_block *block)
2815 struct dasd_ccw_req *cqr, *n;
2817 struct list_head flush_queue;
2819 INIT_LIST_HEAD(&flush_queue);
2820 spin_lock_bh(&block->queue_lock);
2823 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2824 /* if this request currently owned by a dasd_device cancel it */
2825 if (cqr->status >= DASD_CQR_QUEUED)
2826 rc = dasd_cancel_req(cqr);
2829 /* Rechain request (including erp chain) so it won't be
2830 * touched by the dasd_block_tasklet anymore.
2831 * Replace the callback so we notice when the request
2832 * is returned from the dasd_device layer.
2834 cqr->callback = _dasd_wake_block_flush_cb;
2835 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2836 list_move_tail(&cqr->blocklist, &flush_queue);
2838 /* moved more than one request - need to restart */
2841 spin_unlock_bh(&block->queue_lock);
2842 /* Now call the callback function of flushed requests */
2844 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
2845 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
2846 /* Process finished ERP request. */
2848 spin_lock_bh(&block->queue_lock);
2849 __dasd_process_erp(block->base, cqr);
2850 spin_unlock_bh(&block->queue_lock);
2851 /* restart list_for_xx loop since dasd_process_erp
2852 * might remove multiple elements */
2855 /* call the callback function */
2856 spin_lock_irq(&block->request_queue_lock);
2857 cqr->endclk = get_tod_clock();
2858 list_del_init(&cqr->blocklist);
2859 __dasd_cleanup_cqr(cqr);
2860 spin_unlock_irq(&block->request_queue_lock);
2866 * Schedules a call to dasd_tasklet over the device tasklet.
2868 void dasd_schedule_block_bh(struct dasd_block *block)
2870 /* Protect against rescheduling. */
2871 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
2873 /* life cycle of block is bound to it's base device */
2874 dasd_get_device(block->base);
2875 tasklet_hi_schedule(&block->tasklet);
2877 EXPORT_SYMBOL(dasd_schedule_block_bh);
2881 * SECTION: external block device operations
2882 * (request queue handling, open, release, etc.)
2886 * Dasd request queue function. Called from ll_rw_blk.c
2888 static void do_dasd_request(struct request_queue *queue)
2890 struct dasd_block *block;
2892 block = queue->queuedata;
2893 spin_lock(&block->queue_lock);
2894 /* Get new request from the block device request queue */
2895 __dasd_process_request_queue(block);
2896 /* Now check if the head of the ccw queue needs to be started. */
2897 __dasd_block_start_head(block);
2898 spin_unlock(&block->queue_lock);
2902 * Block timeout callback, called from the block layer
2904 * request_queue lock is held on entry.
2907 * BLK_EH_RESET_TIMER if the request should be left running
2908 * BLK_EH_NOT_HANDLED if the request is handled or terminated
2911 enum blk_eh_timer_return dasd_times_out(struct request *req)
2913 struct dasd_ccw_req *cqr = req->completion_data;
2914 struct dasd_block *block = req->q->queuedata;
2915 struct dasd_device *device;
2919 return BLK_EH_NOT_HANDLED;
2921 device = cqr->startdev ? cqr->startdev : block->base;
2922 if (!device->blk_timeout)
2923 return BLK_EH_RESET_TIMER;
2924 DBF_DEV_EVENT(DBF_WARNING, device,
2925 " dasd_times_out cqr %p status %x",
2928 spin_lock(&block->queue_lock);
2929 spin_lock(get_ccwdev_lock(device->cdev));
2931 cqr->intrc = -ETIMEDOUT;
2932 if (cqr->status >= DASD_CQR_QUEUED) {
2933 spin_unlock(get_ccwdev_lock(device->cdev));
2934 rc = dasd_cancel_req(cqr);
2935 } else if (cqr->status == DASD_CQR_FILLED ||
2936 cqr->status == DASD_CQR_NEED_ERP) {
2937 cqr->status = DASD_CQR_TERMINATED;
2938 spin_unlock(get_ccwdev_lock(device->cdev));
2939 } else if (cqr->status == DASD_CQR_IN_ERP) {
2940 struct dasd_ccw_req *searchcqr, *nextcqr, *tmpcqr;
2942 list_for_each_entry_safe(searchcqr, nextcqr,
2943 &block->ccw_queue, blocklist) {
2945 while (tmpcqr->refers)
2946 tmpcqr = tmpcqr->refers;
2949 /* searchcqr is an ERP request for cqr */
2950 searchcqr->retries = -1;
2951 searchcqr->intrc = -ETIMEDOUT;
2952 if (searchcqr->status >= DASD_CQR_QUEUED) {
2953 spin_unlock(get_ccwdev_lock(device->cdev));
2954 rc = dasd_cancel_req(searchcqr);
2955 spin_lock(get_ccwdev_lock(device->cdev));
2956 } else if ((searchcqr->status == DASD_CQR_FILLED) ||
2957 (searchcqr->status == DASD_CQR_NEED_ERP)) {
2958 searchcqr->status = DASD_CQR_TERMINATED;
2960 } else if (searchcqr->status == DASD_CQR_IN_ERP) {
2962 * Shouldn't happen; most recent ERP
2963 * request is at the front of queue
2969 spin_unlock(get_ccwdev_lock(device->cdev));
2971 dasd_schedule_block_bh(block);
2972 spin_unlock(&block->queue_lock);
2974 return rc ? BLK_EH_RESET_TIMER : BLK_EH_NOT_HANDLED;
2978 * Allocate and initialize request queue and default I/O scheduler.
2980 static int dasd_alloc_queue(struct dasd_block *block)
2982 block->request_queue = blk_init_queue(do_dasd_request,
2983 &block->request_queue_lock);
2984 if (block->request_queue == NULL)
2987 block->request_queue->queuedata = block;
2993 * Allocate and initialize request queue.
2995 static void dasd_setup_queue(struct dasd_block *block)
2999 if (block->base->features & DASD_FEATURE_USERAW) {
3001 * the max_blocks value for raw_track access is 256
3002 * it is higher than the native ECKD value because we
3003 * only need one ccw per track
3004 * so the max_hw_sectors are
3005 * 2048 x 512B = 1024kB = 16 tracks
3009 max = block->base->discipline->max_blocks << block->s2b_shift;
3011 blk_queue_logical_block_size(block->request_queue,
3013 blk_queue_max_hw_sectors(block->request_queue, max);
3014 blk_queue_max_segments(block->request_queue, -1L);
3015 /* with page sized segments we can translate each segement into
3018 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
3019 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
3023 * Deactivate and free request queue.
3025 static void dasd_free_queue(struct dasd_block *block)
3027 if (block->request_queue) {
3028 blk_cleanup_queue(block->request_queue);
3029 block->request_queue = NULL;
3034 * Flush request on the request queue.
3036 static void dasd_flush_request_queue(struct dasd_block *block)
3038 struct request *req;
3040 if (!block->request_queue)
3043 spin_lock_irq(&block->request_queue_lock);
3044 while ((req = blk_fetch_request(block->request_queue)))
3045 __blk_end_request_all(req, -EIO);
3046 spin_unlock_irq(&block->request_queue_lock);
3049 static int dasd_open(struct block_device *bdev, fmode_t mode)
3051 struct dasd_device *base;
3054 base = dasd_device_from_gendisk(bdev->bd_disk);
3058 atomic_inc(&base->block->open_count);
3059 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
3064 if (!try_module_get(base->discipline->owner)) {
3069 if (dasd_probeonly) {
3070 dev_info(&base->cdev->dev,
3071 "Accessing the DASD failed because it is in "
3072 "probeonly mode\n");
3077 if (base->state <= DASD_STATE_BASIC) {
3078 DBF_DEV_EVENT(DBF_ERR, base, " %s",
3079 " Cannot open unrecognized device");
3084 if ((mode & FMODE_WRITE) &&
3085 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
3086 (base->features & DASD_FEATURE_READONLY))) {
3091 dasd_put_device(base);
3095 module_put(base->discipline->owner);
3097 atomic_dec(&base->block->open_count);
3098 dasd_put_device(base);
3102 static void dasd_release(struct gendisk *disk, fmode_t mode)
3104 struct dasd_device *base = dasd_device_from_gendisk(disk);
3106 atomic_dec(&base->block->open_count);
3107 module_put(base->discipline->owner);
3108 dasd_put_device(base);
3113 * Return disk geometry.
3115 static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3117 struct dasd_device *base;
3119 base = dasd_device_from_gendisk(bdev->bd_disk);
3123 if (!base->discipline ||
3124 !base->discipline->fill_geometry) {
3125 dasd_put_device(base);
3128 base->discipline->fill_geometry(base->block, geo);
3129 geo->start = get_start_sect(bdev) >> base->block->s2b_shift;
3130 dasd_put_device(base);
3134 const struct block_device_operations
3135 dasd_device_operations = {
3136 .owner = THIS_MODULE,
3138 .release = dasd_release,
3139 .ioctl = dasd_ioctl,
3140 .compat_ioctl = dasd_ioctl,
3141 .getgeo = dasd_getgeo,
3144 /*******************************************************************************
3145 * end of block device operations
3151 #ifdef CONFIG_PROC_FS
3155 if (dasd_page_cache != NULL) {
3156 kmem_cache_destroy(dasd_page_cache);
3157 dasd_page_cache = NULL;
3159 dasd_gendisk_exit();
3161 if (dasd_debug_area != NULL) {
3162 debug_unregister(dasd_debug_area);
3163 dasd_debug_area = NULL;
3165 dasd_statistics_removeroot();
3169 * SECTION: common functions for ccw_driver use
3173 * Is the device read-only?
3174 * Note that this function does not report the setting of the
3175 * readonly device attribute, but how it is configured in z/VM.
3177 int dasd_device_is_ro(struct dasd_device *device)
3179 struct ccw_dev_id dev_id;
3180 struct diag210 diag_data;
3185 ccw_device_get_id(device->cdev, &dev_id);
3186 memset(&diag_data, 0, sizeof(diag_data));
3187 diag_data.vrdcdvno = dev_id.devno;
3188 diag_data.vrdclen = sizeof(diag_data);
3189 rc = diag210(&diag_data);
3190 if (rc == 0 || rc == 2) {
3191 return diag_data.vrdcvfla & 0x80;
3193 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
3198 EXPORT_SYMBOL_GPL(dasd_device_is_ro);
3200 static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
3202 struct ccw_device *cdev = data;
3205 ret = ccw_device_set_online(cdev);
3207 pr_warn("%s: Setting the DASD online failed with rc=%d\n",
3208 dev_name(&cdev->dev), ret);
3212 * Initial attempt at a probe function. this can be simplified once
3213 * the other detection code is gone.
3215 int dasd_generic_probe(struct ccw_device *cdev,
3216 struct dasd_discipline *discipline)
3220 ret = dasd_add_sysfs_files(cdev);
3222 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
3223 "dasd_generic_probe: could not add "
3227 cdev->handler = &dasd_int_handler;
3230 * Automatically online either all dasd devices (dasd_autodetect)
3231 * or all devices specified with dasd= parameters during
3234 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
3235 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
3236 async_schedule(dasd_generic_auto_online, cdev);
3239 EXPORT_SYMBOL_GPL(dasd_generic_probe);
3242 * This will one day be called from a global not_oper handler.
3243 * It is also used by driver_unregister during module unload.
3245 void dasd_generic_remove(struct ccw_device *cdev)
3247 struct dasd_device *device;
3248 struct dasd_block *block;
3250 cdev->handler = NULL;
3252 device = dasd_device_from_cdev(cdev);
3253 if (IS_ERR(device)) {
3254 dasd_remove_sysfs_files(cdev);
3257 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3258 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3259 /* Already doing offline processing */
3260 dasd_put_device(device);
3261 dasd_remove_sysfs_files(cdev);
3265 * This device is removed unconditionally. Set offline
3266 * flag to prevent dasd_open from opening it while it is
3267 * no quite down yet.
3269 dasd_set_target_state(device, DASD_STATE_NEW);
3270 /* dasd_delete_device destroys the device reference. */
3271 block = device->block;
3272 dasd_delete_device(device);
3274 * life cycle of block is bound to device, so delete it after
3275 * device was safely removed
3278 dasd_free_block(block);
3280 dasd_remove_sysfs_files(cdev);
3282 EXPORT_SYMBOL_GPL(dasd_generic_remove);
3285 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
3286 * the device is detected for the first time and is supposed to be used
3287 * or the user has started activation through sysfs.
3289 int dasd_generic_set_online(struct ccw_device *cdev,
3290 struct dasd_discipline *base_discipline)
3292 struct dasd_discipline *discipline;
3293 struct dasd_device *device;
3296 /* first online clears initial online feature flag */
3297 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
3298 device = dasd_create_device(cdev);
3300 return PTR_ERR(device);
3302 discipline = base_discipline;
3303 if (device->features & DASD_FEATURE_USEDIAG) {
3304 if (!dasd_diag_discipline_pointer) {
3305 /* Try to load the required module. */
3306 rc = request_module(DASD_DIAG_MOD);
3308 pr_warn("%s Setting the DASD online failed "
3309 "because the required module %s "
3310 "could not be loaded (rc=%d)\n",
3311 dev_name(&cdev->dev), DASD_DIAG_MOD,
3313 dasd_delete_device(device);
3317 /* Module init could have failed, so check again here after
3318 * request_module(). */
3319 if (!dasd_diag_discipline_pointer) {
3320 pr_warn("%s Setting the DASD online failed because of missing DIAG discipline\n",
3321 dev_name(&cdev->dev));
3322 dasd_delete_device(device);
3325 discipline = dasd_diag_discipline_pointer;
3327 if (!try_module_get(base_discipline->owner)) {
3328 dasd_delete_device(device);
3331 if (!try_module_get(discipline->owner)) {
3332 module_put(base_discipline->owner);
3333 dasd_delete_device(device);
3336 device->base_discipline = base_discipline;
3337 device->discipline = discipline;
3339 /* check_device will allocate block device if necessary */
3340 rc = discipline->check_device(device);
3342 pr_warn("%s Setting the DASD online with discipline %s failed with rc=%i\n",
3343 dev_name(&cdev->dev), discipline->name, rc);
3344 module_put(discipline->owner);
3345 module_put(base_discipline->owner);
3346 dasd_delete_device(device);
3350 dasd_set_target_state(device, DASD_STATE_ONLINE);
3351 if (device->state <= DASD_STATE_KNOWN) {
3352 pr_warn("%s Setting the DASD online failed because of a missing discipline\n",
3353 dev_name(&cdev->dev));
3355 dasd_set_target_state(device, DASD_STATE_NEW);
3357 dasd_free_block(device->block);
3358 dasd_delete_device(device);
3360 pr_debug("dasd_generic device %s found\n",
3361 dev_name(&cdev->dev));
3363 wait_event(dasd_init_waitq, _wait_for_device(device));
3365 dasd_put_device(device);
3368 EXPORT_SYMBOL_GPL(dasd_generic_set_online);
3370 int dasd_generic_set_offline(struct ccw_device *cdev)
3372 struct dasd_device *device;
3373 struct dasd_block *block;
3374 int max_count, open_count, rc;
3377 device = dasd_device_from_cdev(cdev);
3379 return PTR_ERR(device);
3382 * We must make sure that this device is currently not in use.
3383 * The open_count is increased for every opener, that includes
3384 * the blkdev_get in dasd_scan_partitions. We are only interested
3385 * in the other openers.
3387 if (device->block) {
3388 max_count = device->block->bdev ? 0 : -1;
3389 open_count = atomic_read(&device->block->open_count);
3390 if (open_count > max_count) {
3392 pr_warn("%s: The DASD cannot be set offline with open count %i\n",
3393 dev_name(&cdev->dev), open_count);
3395 pr_warn("%s: The DASD cannot be set offline while it is in use\n",
3396 dev_name(&cdev->dev));
3397 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3398 dasd_put_device(device);
3403 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3405 * safe offline already running
3406 * could only be called by normal offline so safe_offline flag
3407 * needs to be removed to run normal offline and kill all I/O
3409 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3410 /* Already doing normal offline processing */
3411 dasd_put_device(device);
3414 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
3417 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3418 /* Already doing offline processing */
3419 dasd_put_device(device);
3424 * if safe_offline called set safe_offline_running flag and
3425 * clear safe_offline so that a call to normal offline
3426 * can overrun safe_offline processing
3428 if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags) &&
3429 !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3431 * If we want to set the device safe offline all IO operations
3432 * should be finished before continuing the offline process
3433 * so sync bdev first and then wait for our queues to become
3436 /* sync blockdev and partitions */
3437 rc = fsync_bdev(device->block->bdev);
3441 /* schedule device tasklet and wait for completion */
3442 dasd_schedule_device_bh(device);
3443 rc = wait_event_interruptible(shutdown_waitq,
3444 _wait_for_empty_queues(device));
3449 set_bit(DASD_FLAG_OFFLINE, &device->flags);
3450 dasd_set_target_state(device, DASD_STATE_NEW);
3451 /* dasd_delete_device destroys the device reference. */
3452 block = device->block;
3453 dasd_delete_device(device);
3455 * life cycle of block is bound to device, so delete it after
3456 * device was safely removed
3459 dasd_free_block(block);
3463 /* interrupted by signal */
3464 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
3465 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags);
3466 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3467 dasd_put_device(device);
3470 EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
3472 int dasd_generic_last_path_gone(struct dasd_device *device)
3474 struct dasd_ccw_req *cqr;
3476 dev_warn(&device->cdev->dev, "No operational channel path is left "
3477 "for the device\n");
3478 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
3479 /* First of all call extended error reporting. */
3480 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3482 if (device->state < DASD_STATE_BASIC)
3484 /* Device is active. We want to keep it. */
3485 list_for_each_entry(cqr, &device->ccw_queue, devlist)
3486 if ((cqr->status == DASD_CQR_IN_IO) ||
3487 (cqr->status == DASD_CQR_CLEAR_PENDING)) {
3488 cqr->status = DASD_CQR_QUEUED;
3491 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
3492 dasd_device_clear_timer(device);
3493 dasd_schedule_device_bh(device);
3496 EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
3498 int dasd_generic_path_operational(struct dasd_device *device)
3500 dev_info(&device->cdev->dev, "A channel path to the device has become "
3502 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
3503 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
3504 if (device->stopped & DASD_UNRESUMED_PM) {
3505 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
3506 dasd_restore_device(device);
3509 dasd_schedule_device_bh(device);
3511 dasd_schedule_block_bh(device->block);
3513 if (!device->stopped)
3514 wake_up(&generic_waitq);
3518 EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
3520 int dasd_generic_notify(struct ccw_device *cdev, int event)
3522 struct dasd_device *device;
3525 device = dasd_device_from_cdev_locked(cdev);
3533 device->path_data.opm = 0;
3534 device->path_data.ppm = 0;
3535 device->path_data.npm = 0;
3536 ret = dasd_generic_last_path_gone(device);
3540 if (device->path_data.opm)
3541 ret = dasd_generic_path_operational(device);
3544 dasd_put_device(device);
3547 EXPORT_SYMBOL_GPL(dasd_generic_notify);
3549 void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
3552 __u8 oldopm, eventlpm;
3553 struct dasd_device *device;
3555 device = dasd_device_from_cdev_locked(cdev);
3558 for (chp = 0; chp < 8; chp++) {
3559 eventlpm = 0x80 >> chp;
3560 if (path_event[chp] & PE_PATH_GONE) {
3561 oldopm = device->path_data.opm;
3562 device->path_data.opm &= ~eventlpm;
3563 device->path_data.ppm &= ~eventlpm;
3564 device->path_data.npm &= ~eventlpm;
3565 if (oldopm && !device->path_data.opm) {
3566 dev_warn(&device->cdev->dev,
3567 "No verified channel paths remain "
3568 "for the device\n");
3569 DBF_DEV_EVENT(DBF_WARNING, device,
3570 "%s", "last verified path gone");
3571 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3572 dasd_device_set_stop_bits(device,
3573 DASD_STOPPED_DC_WAIT);
3576 if (path_event[chp] & PE_PATH_AVAILABLE) {
3577 device->path_data.opm &= ~eventlpm;
3578 device->path_data.ppm &= ~eventlpm;
3579 device->path_data.npm &= ~eventlpm;
3580 device->path_data.tbvpm |= eventlpm;
3581 dasd_schedule_device_bh(device);
3583 if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) {
3584 if (!(device->path_data.opm & eventlpm) &&
3585 !(device->path_data.tbvpm & eventlpm)) {
3587 * we can not establish a pathgroup on an
3588 * unavailable path, so trigger a path
3589 * verification first
3591 device->path_data.tbvpm |= eventlpm;
3592 dasd_schedule_device_bh(device);
3594 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3595 "Pathgroup re-established\n");
3596 if (device->discipline->kick_validate)
3597 device->discipline->kick_validate(device);
3600 dasd_put_device(device);
3602 EXPORT_SYMBOL_GPL(dasd_generic_path_event);
3604 int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
3606 if (!device->path_data.opm && lpm) {
3607 device->path_data.opm = lpm;
3608 dasd_generic_path_operational(device);
3610 device->path_data.opm |= lpm;
3613 EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
3616 int dasd_generic_pm_freeze(struct ccw_device *cdev)
3618 struct dasd_device *device = dasd_device_from_cdev(cdev);
3619 struct list_head freeze_queue;
3620 struct dasd_ccw_req *cqr, *n;
3621 struct dasd_ccw_req *refers;
3625 return PTR_ERR(device);
3627 /* mark device as suspended */
3628 set_bit(DASD_FLAG_SUSPENDED, &device->flags);
3630 if (device->discipline->freeze)
3631 rc = device->discipline->freeze(device);
3633 /* disallow new I/O */
3634 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
3636 /* clear active requests and requeue them to block layer if possible */
3637 INIT_LIST_HEAD(&freeze_queue);
3638 spin_lock_irq(get_ccwdev_lock(cdev));
3640 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
3641 /* Check status and move request to flush_queue */
3642 if (cqr->status == DASD_CQR_IN_IO) {
3643 rc = device->discipline->term_IO(cqr);
3645 /* unable to terminate requeust */
3646 dev_err(&device->cdev->dev,
3647 "Unable to terminate request %p "
3648 "on suspend\n", cqr);
3649 spin_unlock_irq(get_ccwdev_lock(cdev));
3650 dasd_put_device(device);
3654 list_move_tail(&cqr->devlist, &freeze_queue);
3656 spin_unlock_irq(get_ccwdev_lock(cdev));
3658 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
3659 wait_event(dasd_flush_wq,
3660 (cqr->status != DASD_CQR_CLEAR_PENDING));
3661 if (cqr->status == DASD_CQR_CLEARED)
3662 cqr->status = DASD_CQR_QUEUED;
3664 /* requeue requests to blocklayer will only work for
3665 block device requests */
3666 if (_dasd_requeue_request(cqr))
3669 /* remove requests from device and block queue */
3670 list_del_init(&cqr->devlist);
3671 while (cqr->refers != NULL) {
3672 refers = cqr->refers;
3673 /* remove the request from the block queue */
3674 list_del(&cqr->blocklist);
3675 /* free the finished erp request */
3676 dasd_free_erp_request(cqr, cqr->memdev);
3680 list_del_init(&cqr->blocklist);
3681 cqr->block->base->discipline->free_cp(
3682 cqr, (struct request *) cqr->callback_data);
3686 * if requests remain then they are internal request
3687 * and go back to the device queue
3689 if (!list_empty(&freeze_queue)) {
3690 /* move freeze_queue to start of the ccw_queue */
3691 spin_lock_irq(get_ccwdev_lock(cdev));
3692 list_splice_tail(&freeze_queue, &device->ccw_queue);
3693 spin_unlock_irq(get_ccwdev_lock(cdev));
3695 dasd_put_device(device);
3698 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
3700 int dasd_generic_restore_device(struct ccw_device *cdev)
3702 struct dasd_device *device = dasd_device_from_cdev(cdev);
3706 return PTR_ERR(device);
3708 /* allow new IO again */
3709 dasd_device_remove_stop_bits(device,
3710 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
3712 dasd_schedule_device_bh(device);
3715 * call discipline restore function
3716 * if device is stopped do nothing e.g. for disconnected devices
3718 if (device->discipline->restore && !(device->stopped))
3719 rc = device->discipline->restore(device);
3720 if (rc || device->stopped)
3722 * if the resume failed for the DASD we put it in
3723 * an UNRESUMED stop state
3725 device->stopped |= DASD_UNRESUMED_PM;
3728 dasd_schedule_block_bh(device->block);
3730 clear_bit(DASD_FLAG_SUSPENDED, &device->flags);
3731 dasd_put_device(device);
3734 EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
3736 static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
3738 int rdc_buffer_size,
3741 struct dasd_ccw_req *cqr;
3743 unsigned long *idaw;
3745 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
3748 /* internal error 13 - Allocating the RDC request failed*/
3749 dev_err(&device->cdev->dev,
3750 "An error occurred in the DASD device driver, "
3751 "reason=%s\n", "13");
3756 ccw->cmd_code = CCW_CMD_RDC;
3757 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
3758 idaw = (unsigned long *) (cqr->data);
3759 ccw->cda = (__u32)(addr_t) idaw;
3760 ccw->flags = CCW_FLAG_IDA;
3761 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
3763 ccw->cda = (__u32)(addr_t) rdc_buffer;
3767 ccw->count = rdc_buffer_size;
3768 cqr->startdev = device;
3769 cqr->memdev = device;
3770 cqr->expires = 10*HZ;
3772 cqr->buildclk = get_tod_clock();
3773 cqr->status = DASD_CQR_FILLED;
3778 int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
3779 void *rdc_buffer, int rdc_buffer_size)
3782 struct dasd_ccw_req *cqr;
3784 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
3787 return PTR_ERR(cqr);
3789 ret = dasd_sleep_on(cqr);
3790 dasd_sfree_request(cqr, cqr->memdev);
3793 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
3796 * In command mode and transport mode we need to look for sense
3797 * data in different places. The sense data itself is allways
3798 * an array of 32 bytes, so we can unify the sense data access
3801 char *dasd_get_sense(struct irb *irb)
3803 struct tsb *tsb = NULL;
3806 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
3807 if (irb->scsw.tm.tcw)
3808 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
3810 if (tsb && tsb->length == 64 && tsb->flags)
3811 switch (tsb->flags & 0x07) {
3812 case 1: /* tsa_iostat */
3813 sense = tsb->tsa.iostat.sense;
3815 case 2: /* tsa_ddpc */
3816 sense = tsb->tsa.ddpc.sense;
3819 /* currently we don't use interrogate data */
3822 } else if (irb->esw.esw0.erw.cons) {
3827 EXPORT_SYMBOL_GPL(dasd_get_sense);
3829 void dasd_generic_shutdown(struct ccw_device *cdev)
3831 struct dasd_device *device;
3833 device = dasd_device_from_cdev(cdev);
3838 dasd_schedule_block_bh(device->block);
3840 dasd_schedule_device_bh(device);
3842 wait_event(shutdown_waitq, _wait_for_empty_queues(device));
3844 EXPORT_SYMBOL_GPL(dasd_generic_shutdown);
3846 static int __init dasd_init(void)
3850 init_waitqueue_head(&dasd_init_waitq);
3851 init_waitqueue_head(&dasd_flush_wq);
3852 init_waitqueue_head(&generic_waitq);
3853 init_waitqueue_head(&shutdown_waitq);
3855 /* register 'common' DASD debug area, used for all DBF_XXX calls */
3856 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
3857 if (dasd_debug_area == NULL) {
3861 debug_register_view(dasd_debug_area, &debug_sprintf_view);
3862 debug_set_level(dasd_debug_area, DBF_WARNING);
3864 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
3866 dasd_diag_discipline_pointer = NULL;
3868 dasd_statistics_createroot();
3870 rc = dasd_devmap_init();
3873 rc = dasd_gendisk_init();
3879 rc = dasd_eer_init();
3882 #ifdef CONFIG_PROC_FS
3883 rc = dasd_proc_init();
3890 pr_info("The DASD device driver could not be initialized\n");
3895 module_init(dasd_init);
3896 module_exit(dasd_exit);