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 * return 1 when device is not eligible for IO
1868 static int __dasd_device_is_unusable(struct dasd_device *device,
1869 struct dasd_ccw_req *cqr)
1871 int mask = ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM);
1873 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
1874 /* dasd is being set offline. */
1877 if (device->stopped) {
1878 if (device->stopped & mask) {
1879 /* stopped and CQR will not change that. */
1882 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1883 /* CQR is not able to change device to
1887 /* CQR required to get device operational. */
1893 * Take a look at the first request on the ccw queue and check
1894 * if it needs to be started.
1896 static void __dasd_device_start_head(struct dasd_device *device)
1898 struct dasd_ccw_req *cqr;
1901 if (list_empty(&device->ccw_queue))
1903 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1904 if (cqr->status != DASD_CQR_QUEUED)
1906 /* if device is not usable return request to upper layer */
1907 if (__dasd_device_is_unusable(device, cqr)) {
1908 cqr->intrc = -EAGAIN;
1909 cqr->status = DASD_CQR_CLEARED;
1910 dasd_schedule_device_bh(device);
1914 rc = device->discipline->start_IO(cqr);
1916 dasd_device_set_timer(device, cqr->expires);
1917 else if (rc == -EACCES) {
1918 dasd_schedule_device_bh(device);
1920 /* Hmpf, try again in 1/2 sec */
1921 dasd_device_set_timer(device, 50);
1924 static void __dasd_device_check_path_events(struct dasd_device *device)
1928 if (device->path_data.tbvpm) {
1929 if (device->stopped & ~(DASD_STOPPED_DC_WAIT |
1932 rc = device->discipline->verify_path(
1933 device, device->path_data.tbvpm);
1935 dasd_device_set_timer(device, 50);
1937 device->path_data.tbvpm = 0;
1942 * Go through all request on the dasd_device request queue,
1943 * terminate them on the cdev if necessary, and return them to the
1944 * submitting layer via callback.
1946 * Make sure that all 'submitting layers' still exist when
1947 * this function is called!. In other words, when 'device' is a base
1948 * device then all block layer requests must have been removed before
1949 * via dasd_flush_block_queue.
1951 int dasd_flush_device_queue(struct dasd_device *device)
1953 struct dasd_ccw_req *cqr, *n;
1955 struct list_head flush_queue;
1957 INIT_LIST_HEAD(&flush_queue);
1958 spin_lock_irq(get_ccwdev_lock(device->cdev));
1960 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
1961 /* Check status and move request to flush_queue */
1962 switch (cqr->status) {
1963 case DASD_CQR_IN_IO:
1964 rc = device->discipline->term_IO(cqr);
1966 /* unable to terminate requeust */
1967 dev_err(&device->cdev->dev,
1968 "Flushing the DASD request queue "
1969 "failed for request %p\n", cqr);
1970 /* stop flush processing */
1974 case DASD_CQR_QUEUED:
1975 cqr->stopclk = get_tod_clock();
1976 cqr->status = DASD_CQR_CLEARED;
1978 default: /* no need to modify the others */
1981 list_move_tail(&cqr->devlist, &flush_queue);
1984 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1986 * After this point all requests must be in state CLEAR_PENDING,
1987 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
1988 * one of the others.
1990 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
1991 wait_event(dasd_flush_wq,
1992 (cqr->status != DASD_CQR_CLEAR_PENDING));
1994 * Now set each request back to TERMINATED, DONE or NEED_ERP
1995 * and call the callback function of flushed requests
1997 __dasd_device_process_final_queue(device, &flush_queue);
2000 EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
2003 * Acquire the device lock and process queues for the device.
2005 static void dasd_device_tasklet(struct dasd_device *device)
2007 struct list_head final_queue;
2009 atomic_set (&device->tasklet_scheduled, 0);
2010 INIT_LIST_HEAD(&final_queue);
2011 spin_lock_irq(get_ccwdev_lock(device->cdev));
2012 /* Check expire time of first request on the ccw queue. */
2013 __dasd_device_check_expire(device);
2014 /* find final requests on ccw queue */
2015 __dasd_device_process_ccw_queue(device, &final_queue);
2016 __dasd_device_check_path_events(device);
2017 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2018 /* Now call the callback function of requests with final status */
2019 __dasd_device_process_final_queue(device, &final_queue);
2020 spin_lock_irq(get_ccwdev_lock(device->cdev));
2021 /* Now check if the head of the ccw queue needs to be started. */
2022 __dasd_device_start_head(device);
2023 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2024 if (waitqueue_active(&shutdown_waitq))
2025 wake_up(&shutdown_waitq);
2026 dasd_put_device(device);
2030 * Schedules a call to dasd_tasklet over the device tasklet.
2032 void dasd_schedule_device_bh(struct dasd_device *device)
2034 /* Protect against rescheduling. */
2035 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
2037 dasd_get_device(device);
2038 tasklet_hi_schedule(&device->tasklet);
2040 EXPORT_SYMBOL(dasd_schedule_device_bh);
2042 void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
2044 device->stopped |= bits;
2046 EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
2048 void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
2050 device->stopped &= ~bits;
2051 if (!device->stopped)
2052 wake_up(&generic_waitq);
2054 EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
2057 * Queue a request to the head of the device ccw_queue.
2058 * Start the I/O if possible.
2060 void dasd_add_request_head(struct dasd_ccw_req *cqr)
2062 struct dasd_device *device;
2063 unsigned long flags;
2065 device = cqr->startdev;
2066 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2067 cqr->status = DASD_CQR_QUEUED;
2068 list_add(&cqr->devlist, &device->ccw_queue);
2069 /* let the bh start the request to keep them in order */
2070 dasd_schedule_device_bh(device);
2071 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2073 EXPORT_SYMBOL(dasd_add_request_head);
2076 * Queue a request to the tail of the device ccw_queue.
2077 * Start the I/O if possible.
2079 void dasd_add_request_tail(struct dasd_ccw_req *cqr)
2081 struct dasd_device *device;
2082 unsigned long flags;
2084 device = cqr->startdev;
2085 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2086 cqr->status = DASD_CQR_QUEUED;
2087 list_add_tail(&cqr->devlist, &device->ccw_queue);
2088 /* let the bh start the request to keep them in order */
2089 dasd_schedule_device_bh(device);
2090 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2092 EXPORT_SYMBOL(dasd_add_request_tail);
2095 * Wakeup helper for the 'sleep_on' functions.
2097 void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
2099 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2100 cqr->callback_data = DASD_SLEEPON_END_TAG;
2101 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2102 wake_up(&generic_waitq);
2104 EXPORT_SYMBOL_GPL(dasd_wakeup_cb);
2106 static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
2108 struct dasd_device *device;
2111 device = cqr->startdev;
2112 spin_lock_irq(get_ccwdev_lock(device->cdev));
2113 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
2114 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2119 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
2121 static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
2123 struct dasd_device *device;
2124 dasd_erp_fn_t erp_fn;
2126 if (cqr->status == DASD_CQR_FILLED)
2128 device = cqr->startdev;
2129 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2130 if (cqr->status == DASD_CQR_TERMINATED) {
2131 device->discipline->handle_terminated_request(cqr);
2134 if (cqr->status == DASD_CQR_NEED_ERP) {
2135 erp_fn = device->discipline->erp_action(cqr);
2139 if (cqr->status == DASD_CQR_FAILED)
2140 dasd_log_sense(cqr, &cqr->irb);
2142 __dasd_process_erp(device, cqr);
2149 static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
2151 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2152 if (cqr->refers) /* erp is not done yet */
2154 return ((cqr->status != DASD_CQR_DONE) &&
2155 (cqr->status != DASD_CQR_FAILED));
2157 return (cqr->status == DASD_CQR_FILLED);
2160 static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
2162 struct dasd_device *device;
2164 struct list_head ccw_queue;
2165 struct dasd_ccw_req *cqr;
2167 INIT_LIST_HEAD(&ccw_queue);
2168 maincqr->status = DASD_CQR_FILLED;
2169 device = maincqr->startdev;
2170 list_add(&maincqr->blocklist, &ccw_queue);
2171 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
2172 cqr = list_first_entry(&ccw_queue,
2173 struct dasd_ccw_req, blocklist)) {
2175 if (__dasd_sleep_on_erp(cqr))
2177 if (cqr->status != DASD_CQR_FILLED) /* could be failed */
2179 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2180 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2181 cqr->status = DASD_CQR_FAILED;
2182 cqr->intrc = -EPERM;
2185 /* Non-temporary stop condition will trigger fail fast */
2186 if (device->stopped & ~DASD_STOPPED_PENDING &&
2187 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2188 (!dasd_eer_enabled(device))) {
2189 cqr->status = DASD_CQR_FAILED;
2190 cqr->intrc = -ENOLINK;
2194 * Don't try to start requests if device is stopped
2195 * except path verification requests
2197 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
2198 if (interruptible) {
2199 rc = wait_event_interruptible(
2200 generic_waitq, !(device->stopped));
2201 if (rc == -ERESTARTSYS) {
2202 cqr->status = DASD_CQR_FAILED;
2203 maincqr->intrc = rc;
2207 wait_event(generic_waitq, !(device->stopped));
2210 cqr->callback = dasd_wakeup_cb;
2212 cqr->callback_data = DASD_SLEEPON_START_TAG;
2213 dasd_add_request_tail(cqr);
2214 if (interruptible) {
2215 rc = wait_event_interruptible(
2216 generic_waitq, _wait_for_wakeup(cqr));
2217 if (rc == -ERESTARTSYS) {
2218 dasd_cancel_req(cqr);
2219 /* wait (non-interruptible) for final status */
2220 wait_event(generic_waitq,
2221 _wait_for_wakeup(cqr));
2222 cqr->status = DASD_CQR_FAILED;
2223 maincqr->intrc = rc;
2227 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2230 maincqr->endclk = get_tod_clock();
2231 if ((maincqr->status != DASD_CQR_DONE) &&
2232 (maincqr->intrc != -ERESTARTSYS))
2233 dasd_log_sense(maincqr, &maincqr->irb);
2234 if (maincqr->status == DASD_CQR_DONE)
2236 else if (maincqr->intrc)
2237 rc = maincqr->intrc;
2243 static inline int _wait_for_wakeup_queue(struct list_head *ccw_queue)
2245 struct dasd_ccw_req *cqr;
2247 list_for_each_entry(cqr, ccw_queue, blocklist) {
2248 if (cqr->callback_data != DASD_SLEEPON_END_TAG)
2255 static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible)
2257 struct dasd_device *device;
2258 struct dasd_ccw_req *cqr, *n;
2262 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2263 device = cqr->startdev;
2264 if (cqr->status != DASD_CQR_FILLED) /*could be failed*/
2267 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2268 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2269 cqr->status = DASD_CQR_FAILED;
2270 cqr->intrc = -EPERM;
2273 /*Non-temporary stop condition will trigger fail fast*/
2274 if (device->stopped & ~DASD_STOPPED_PENDING &&
2275 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2276 !dasd_eer_enabled(device)) {
2277 cqr->status = DASD_CQR_FAILED;
2278 cqr->intrc = -EAGAIN;
2282 /*Don't try to start requests if device is stopped*/
2283 if (interruptible) {
2284 rc = wait_event_interruptible(
2285 generic_waitq, !device->stopped);
2286 if (rc == -ERESTARTSYS) {
2287 cqr->status = DASD_CQR_FAILED;
2292 wait_event(generic_waitq, !(device->stopped));
2295 cqr->callback = dasd_wakeup_cb;
2296 cqr->callback_data = DASD_SLEEPON_START_TAG;
2297 dasd_add_request_tail(cqr);
2300 wait_event(generic_waitq, _wait_for_wakeup_queue(ccw_queue));
2303 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2305 * for alias devices simplify error recovery and
2306 * return to upper layer
2307 * do not skip ERP requests
2309 if (cqr->startdev != cqr->basedev && !cqr->refers &&
2310 (cqr->status == DASD_CQR_TERMINATED ||
2311 cqr->status == DASD_CQR_NEED_ERP))
2314 /* normal recovery for basedev IO */
2315 if (__dasd_sleep_on_erp(cqr))
2316 /* handle erp first */
2324 * Queue a request to the tail of the device ccw_queue and wait for
2327 int dasd_sleep_on(struct dasd_ccw_req *cqr)
2329 return _dasd_sleep_on(cqr, 0);
2331 EXPORT_SYMBOL(dasd_sleep_on);
2334 * Start requests from a ccw_queue and wait for their completion.
2336 int dasd_sleep_on_queue(struct list_head *ccw_queue)
2338 return _dasd_sleep_on_queue(ccw_queue, 0);
2340 EXPORT_SYMBOL(dasd_sleep_on_queue);
2343 * Queue a request to the tail of the device ccw_queue and wait
2344 * interruptible for it's completion.
2346 int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
2348 return _dasd_sleep_on(cqr, 1);
2350 EXPORT_SYMBOL(dasd_sleep_on_interruptible);
2353 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
2354 * for eckd devices) the currently running request has to be terminated
2355 * and be put back to status queued, before the special request is added
2356 * to the head of the queue. Then the special request is waited on normally.
2358 static inline int _dasd_term_running_cqr(struct dasd_device *device)
2360 struct dasd_ccw_req *cqr;
2363 if (list_empty(&device->ccw_queue))
2365 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
2366 rc = device->discipline->term_IO(cqr);
2369 * CQR terminated because a more important request is pending.
2370 * Undo decreasing of retry counter because this is
2371 * not an error case.
2377 int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
2379 struct dasd_device *device;
2382 device = cqr->startdev;
2383 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2384 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2385 cqr->status = DASD_CQR_FAILED;
2386 cqr->intrc = -EPERM;
2389 spin_lock_irq(get_ccwdev_lock(device->cdev));
2390 rc = _dasd_term_running_cqr(device);
2392 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2395 cqr->callback = dasd_wakeup_cb;
2396 cqr->callback_data = DASD_SLEEPON_START_TAG;
2397 cqr->status = DASD_CQR_QUEUED;
2399 * add new request as second
2400 * first the terminated cqr needs to be finished
2402 list_add(&cqr->devlist, device->ccw_queue.next);
2404 /* let the bh start the request to keep them in order */
2405 dasd_schedule_device_bh(device);
2407 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2409 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2411 if (cqr->status == DASD_CQR_DONE)
2413 else if (cqr->intrc)
2419 dasd_schedule_device_bh(device);
2421 dasd_schedule_block_bh(device->block);
2425 EXPORT_SYMBOL(dasd_sleep_on_immediatly);
2428 * Cancels a request that was started with dasd_sleep_on_req.
2429 * This is useful to timeout requests. The request will be
2430 * terminated if it is currently in i/o.
2431 * Returns 0 if request termination was successful
2432 * negative error code if termination failed
2433 * Cancellation of a request is an asynchronous operation! The calling
2434 * function has to wait until the request is properly returned via callback.
2436 int dasd_cancel_req(struct dasd_ccw_req *cqr)
2438 struct dasd_device *device = cqr->startdev;
2439 unsigned long flags;
2443 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2444 switch (cqr->status) {
2445 case DASD_CQR_QUEUED:
2446 /* request was not started - just set to cleared */
2447 cqr->status = DASD_CQR_CLEARED;
2448 if (cqr->callback_data == DASD_SLEEPON_START_TAG)
2449 cqr->callback_data = DASD_SLEEPON_END_TAG;
2451 case DASD_CQR_IN_IO:
2452 /* request in IO - terminate IO and release again */
2453 rc = device->discipline->term_IO(cqr);
2455 dev_err(&device->cdev->dev,
2456 "Cancelling request %p failed with rc=%d\n",
2459 cqr->stopclk = get_tod_clock();
2462 default: /* already finished or clear pending - do nothing */
2465 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2466 dasd_schedule_device_bh(device);
2469 EXPORT_SYMBOL(dasd_cancel_req);
2472 * SECTION: Operations of the dasd_block layer.
2476 * Timeout function for dasd_block. This is used when the block layer
2477 * is waiting for something that may not come reliably, (e.g. a state
2480 static void dasd_block_timeout(unsigned long ptr)
2482 unsigned long flags;
2483 struct dasd_block *block;
2485 block = (struct dasd_block *) ptr;
2486 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
2487 /* re-activate request queue */
2488 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
2489 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
2490 dasd_schedule_block_bh(block);
2494 * Setup timeout for a dasd_block in jiffies.
2496 void dasd_block_set_timer(struct dasd_block *block, int expires)
2499 del_timer(&block->timer);
2501 mod_timer(&block->timer, jiffies + expires);
2503 EXPORT_SYMBOL(dasd_block_set_timer);
2506 * Clear timeout for a dasd_block.
2508 void dasd_block_clear_timer(struct dasd_block *block)
2510 del_timer(&block->timer);
2512 EXPORT_SYMBOL(dasd_block_clear_timer);
2515 * Process finished error recovery ccw.
2517 static void __dasd_process_erp(struct dasd_device *device,
2518 struct dasd_ccw_req *cqr)
2520 dasd_erp_fn_t erp_fn;
2522 if (cqr->status == DASD_CQR_DONE)
2523 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
2525 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
2526 erp_fn = device->discipline->erp_postaction(cqr);
2531 * Fetch requests from the block device queue.
2533 static void __dasd_process_request_queue(struct dasd_block *block)
2535 struct request_queue *queue;
2536 struct request *req;
2537 struct dasd_ccw_req *cqr;
2538 struct dasd_device *basedev;
2539 unsigned long flags;
2540 queue = block->request_queue;
2541 basedev = block->base;
2542 /* No queue ? Then there is nothing to do. */
2547 * We requeue request from the block device queue to the ccw
2548 * queue only in two states. In state DASD_STATE_READY the
2549 * partition detection is done and we need to requeue requests
2550 * for that. State DASD_STATE_ONLINE is normal block device
2553 if (basedev->state < DASD_STATE_READY) {
2554 while ((req = blk_fetch_request(block->request_queue)))
2555 __blk_end_request_all(req, -EIO);
2559 /* if device ist stopped do not fetch new requests */
2560 if (basedev->stopped)
2563 /* Now we try to fetch requests from the request queue */
2564 while ((req = blk_peek_request(queue))) {
2565 if (basedev->features & DASD_FEATURE_READONLY &&
2566 rq_data_dir(req) == WRITE) {
2567 DBF_DEV_EVENT(DBF_ERR, basedev,
2568 "Rejecting write request %p",
2570 blk_start_request(req);
2571 __blk_end_request_all(req, -EIO);
2574 if (test_bit(DASD_FLAG_ABORTALL, &basedev->flags) &&
2575 (basedev->features & DASD_FEATURE_FAILFAST ||
2576 blk_noretry_request(req))) {
2577 DBF_DEV_EVENT(DBF_ERR, basedev,
2578 "Rejecting failfast request %p",
2580 blk_start_request(req);
2581 __blk_end_request_all(req, -ETIMEDOUT);
2584 cqr = basedev->discipline->build_cp(basedev, block, req);
2586 if (PTR_ERR(cqr) == -EBUSY)
2587 break; /* normal end condition */
2588 if (PTR_ERR(cqr) == -ENOMEM)
2589 break; /* terminate request queue loop */
2590 if (PTR_ERR(cqr) == -EAGAIN) {
2592 * The current request cannot be build right
2593 * now, we have to try later. If this request
2594 * is the head-of-queue we stop the device
2597 if (!list_empty(&block->ccw_queue))
2600 get_ccwdev_lock(basedev->cdev), flags);
2601 dasd_device_set_stop_bits(basedev,
2602 DASD_STOPPED_PENDING);
2603 spin_unlock_irqrestore(
2604 get_ccwdev_lock(basedev->cdev), flags);
2605 dasd_block_set_timer(block, HZ/2);
2608 DBF_DEV_EVENT(DBF_ERR, basedev,
2609 "CCW creation failed (rc=%ld) "
2612 blk_start_request(req);
2613 __blk_end_request_all(req, -EIO);
2617 * Note: callback is set to dasd_return_cqr_cb in
2618 * __dasd_block_start_head to cover erp requests as well
2620 cqr->callback_data = (void *) req;
2621 cqr->status = DASD_CQR_FILLED;
2622 req->completion_data = cqr;
2623 blk_start_request(req);
2624 list_add_tail(&cqr->blocklist, &block->ccw_queue);
2625 INIT_LIST_HEAD(&cqr->devlist);
2626 dasd_profile_start(block, cqr, req);
2630 static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
2632 struct request *req;
2636 req = (struct request *) cqr->callback_data;
2637 dasd_profile_end(cqr->block, cqr, req);
2638 status = cqr->block->base->discipline->free_cp(cqr, req);
2641 else if (status == 0) {
2642 if (cqr->intrc == -EPERM)
2644 else if (cqr->intrc == -ENOLINK ||
2645 cqr->intrc == -ETIMEDOUT)
2650 __blk_end_request_all(req, error);
2654 * Process ccw request queue.
2656 static void __dasd_process_block_ccw_queue(struct dasd_block *block,
2657 struct list_head *final_queue)
2659 struct list_head *l, *n;
2660 struct dasd_ccw_req *cqr;
2661 dasd_erp_fn_t erp_fn;
2662 unsigned long flags;
2663 struct dasd_device *base = block->base;
2666 /* Process request with final status. */
2667 list_for_each_safe(l, n, &block->ccw_queue) {
2668 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2669 if (cqr->status != DASD_CQR_DONE &&
2670 cqr->status != DASD_CQR_FAILED &&
2671 cqr->status != DASD_CQR_NEED_ERP &&
2672 cqr->status != DASD_CQR_TERMINATED)
2675 if (cqr->status == DASD_CQR_TERMINATED) {
2676 base->discipline->handle_terminated_request(cqr);
2680 /* Process requests that may be recovered */
2681 if (cqr->status == DASD_CQR_NEED_ERP) {
2682 erp_fn = base->discipline->erp_action(cqr);
2683 if (IS_ERR(erp_fn(cqr)))
2688 /* log sense for fatal error */
2689 if (cqr->status == DASD_CQR_FAILED) {
2690 dasd_log_sense(cqr, &cqr->irb);
2693 /* First of all call extended error reporting. */
2694 if (dasd_eer_enabled(base) &&
2695 cqr->status == DASD_CQR_FAILED) {
2696 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
2698 /* restart request */
2699 cqr->status = DASD_CQR_FILLED;
2701 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
2702 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
2703 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
2708 /* Process finished ERP request. */
2710 __dasd_process_erp(base, cqr);
2714 /* Rechain finished requests to final queue */
2715 cqr->endclk = get_tod_clock();
2716 list_move_tail(&cqr->blocklist, final_queue);
2720 static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
2722 dasd_schedule_block_bh(cqr->block);
2725 static void __dasd_block_start_head(struct dasd_block *block)
2727 struct dasd_ccw_req *cqr;
2729 if (list_empty(&block->ccw_queue))
2731 /* We allways begin with the first requests on the queue, as some
2732 * of previously started requests have to be enqueued on a
2733 * dasd_device again for error recovery.
2735 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
2736 if (cqr->status != DASD_CQR_FILLED)
2738 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
2739 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2740 cqr->status = DASD_CQR_FAILED;
2741 cqr->intrc = -EPERM;
2742 dasd_schedule_block_bh(block);
2745 /* Non-temporary stop condition will trigger fail fast */
2746 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
2747 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2748 (!dasd_eer_enabled(block->base))) {
2749 cqr->status = DASD_CQR_FAILED;
2750 cqr->intrc = -ENOLINK;
2751 dasd_schedule_block_bh(block);
2754 /* Don't try to start requests if device is stopped */
2755 if (block->base->stopped)
2758 /* just a fail safe check, should not happen */
2760 cqr->startdev = block->base;
2762 /* make sure that the requests we submit find their way back */
2763 cqr->callback = dasd_return_cqr_cb;
2765 dasd_add_request_tail(cqr);
2770 * Central dasd_block layer routine. Takes requests from the generic
2771 * block layer request queue, creates ccw requests, enqueues them on
2772 * a dasd_device and processes ccw requests that have been returned.
2774 static void dasd_block_tasklet(struct dasd_block *block)
2776 struct list_head final_queue;
2777 struct list_head *l, *n;
2778 struct dasd_ccw_req *cqr;
2780 atomic_set(&block->tasklet_scheduled, 0);
2781 INIT_LIST_HEAD(&final_queue);
2782 spin_lock(&block->queue_lock);
2783 /* Finish off requests on ccw queue */
2784 __dasd_process_block_ccw_queue(block, &final_queue);
2785 spin_unlock(&block->queue_lock);
2786 /* Now call the callback function of requests with final status */
2787 spin_lock_irq(&block->request_queue_lock);
2788 list_for_each_safe(l, n, &final_queue) {
2789 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2790 list_del_init(&cqr->blocklist);
2791 __dasd_cleanup_cqr(cqr);
2793 spin_lock(&block->queue_lock);
2794 /* Get new request from the block device request queue */
2795 __dasd_process_request_queue(block);
2796 /* Now check if the head of the ccw queue needs to be started. */
2797 __dasd_block_start_head(block);
2798 spin_unlock(&block->queue_lock);
2799 spin_unlock_irq(&block->request_queue_lock);
2800 if (waitqueue_active(&shutdown_waitq))
2801 wake_up(&shutdown_waitq);
2802 dasd_put_device(block->base);
2805 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2807 wake_up(&dasd_flush_wq);
2811 * Requeue a request back to the block request queue
2812 * only works for block requests
2814 static int _dasd_requeue_request(struct dasd_ccw_req *cqr)
2816 struct dasd_block *block = cqr->block;
2817 struct request *req;
2818 unsigned long flags;
2822 spin_lock_irqsave(&block->queue_lock, flags);
2823 req = (struct request *) cqr->callback_data;
2824 blk_requeue_request(block->request_queue, req);
2825 spin_unlock_irqrestore(&block->queue_lock, flags);
2831 * Go through all request on the dasd_block request queue, cancel them
2832 * on the respective dasd_device, and return them to the generic
2835 static int dasd_flush_block_queue(struct dasd_block *block)
2837 struct dasd_ccw_req *cqr, *n;
2839 struct list_head flush_queue;
2841 INIT_LIST_HEAD(&flush_queue);
2842 spin_lock_bh(&block->queue_lock);
2845 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2846 /* if this request currently owned by a dasd_device cancel it */
2847 if (cqr->status >= DASD_CQR_QUEUED)
2848 rc = dasd_cancel_req(cqr);
2851 /* Rechain request (including erp chain) so it won't be
2852 * touched by the dasd_block_tasklet anymore.
2853 * Replace the callback so we notice when the request
2854 * is returned from the dasd_device layer.
2856 cqr->callback = _dasd_wake_block_flush_cb;
2857 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2858 list_move_tail(&cqr->blocklist, &flush_queue);
2860 /* moved more than one request - need to restart */
2863 spin_unlock_bh(&block->queue_lock);
2864 /* Now call the callback function of flushed requests */
2866 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
2867 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
2868 /* Process finished ERP request. */
2870 spin_lock_bh(&block->queue_lock);
2871 __dasd_process_erp(block->base, cqr);
2872 spin_unlock_bh(&block->queue_lock);
2873 /* restart list_for_xx loop since dasd_process_erp
2874 * might remove multiple elements */
2877 /* call the callback function */
2878 spin_lock_irq(&block->request_queue_lock);
2879 cqr->endclk = get_tod_clock();
2880 list_del_init(&cqr->blocklist);
2881 __dasd_cleanup_cqr(cqr);
2882 spin_unlock_irq(&block->request_queue_lock);
2888 * Schedules a call to dasd_tasklet over the device tasklet.
2890 void dasd_schedule_block_bh(struct dasd_block *block)
2892 /* Protect against rescheduling. */
2893 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
2895 /* life cycle of block is bound to it's base device */
2896 dasd_get_device(block->base);
2897 tasklet_hi_schedule(&block->tasklet);
2899 EXPORT_SYMBOL(dasd_schedule_block_bh);
2903 * SECTION: external block device operations
2904 * (request queue handling, open, release, etc.)
2908 * Dasd request queue function. Called from ll_rw_blk.c
2910 static void do_dasd_request(struct request_queue *queue)
2912 struct dasd_block *block;
2914 block = queue->queuedata;
2915 spin_lock(&block->queue_lock);
2916 /* Get new request from the block device request queue */
2917 __dasd_process_request_queue(block);
2918 /* Now check if the head of the ccw queue needs to be started. */
2919 __dasd_block_start_head(block);
2920 spin_unlock(&block->queue_lock);
2924 * Block timeout callback, called from the block layer
2926 * request_queue lock is held on entry.
2929 * BLK_EH_RESET_TIMER if the request should be left running
2930 * BLK_EH_NOT_HANDLED if the request is handled or terminated
2933 enum blk_eh_timer_return dasd_times_out(struct request *req)
2935 struct dasd_ccw_req *cqr = req->completion_data;
2936 struct dasd_block *block = req->q->queuedata;
2937 struct dasd_device *device;
2941 return BLK_EH_NOT_HANDLED;
2943 device = cqr->startdev ? cqr->startdev : block->base;
2944 if (!device->blk_timeout)
2945 return BLK_EH_RESET_TIMER;
2946 DBF_DEV_EVENT(DBF_WARNING, device,
2947 " dasd_times_out cqr %p status %x",
2950 spin_lock(&block->queue_lock);
2951 spin_lock(get_ccwdev_lock(device->cdev));
2953 cqr->intrc = -ETIMEDOUT;
2954 if (cqr->status >= DASD_CQR_QUEUED) {
2955 spin_unlock(get_ccwdev_lock(device->cdev));
2956 rc = dasd_cancel_req(cqr);
2957 } else if (cqr->status == DASD_CQR_FILLED ||
2958 cqr->status == DASD_CQR_NEED_ERP) {
2959 cqr->status = DASD_CQR_TERMINATED;
2960 spin_unlock(get_ccwdev_lock(device->cdev));
2961 } else if (cqr->status == DASD_CQR_IN_ERP) {
2962 struct dasd_ccw_req *searchcqr, *nextcqr, *tmpcqr;
2964 list_for_each_entry_safe(searchcqr, nextcqr,
2965 &block->ccw_queue, blocklist) {
2967 while (tmpcqr->refers)
2968 tmpcqr = tmpcqr->refers;
2971 /* searchcqr is an ERP request for cqr */
2972 searchcqr->retries = -1;
2973 searchcqr->intrc = -ETIMEDOUT;
2974 if (searchcqr->status >= DASD_CQR_QUEUED) {
2975 spin_unlock(get_ccwdev_lock(device->cdev));
2976 rc = dasd_cancel_req(searchcqr);
2977 spin_lock(get_ccwdev_lock(device->cdev));
2978 } else if ((searchcqr->status == DASD_CQR_FILLED) ||
2979 (searchcqr->status == DASD_CQR_NEED_ERP)) {
2980 searchcqr->status = DASD_CQR_TERMINATED;
2982 } else if (searchcqr->status == DASD_CQR_IN_ERP) {
2984 * Shouldn't happen; most recent ERP
2985 * request is at the front of queue
2991 spin_unlock(get_ccwdev_lock(device->cdev));
2993 dasd_schedule_block_bh(block);
2994 spin_unlock(&block->queue_lock);
2996 return rc ? BLK_EH_RESET_TIMER : BLK_EH_NOT_HANDLED;
3000 * Allocate and initialize request queue and default I/O scheduler.
3002 static int dasd_alloc_queue(struct dasd_block *block)
3004 block->request_queue = blk_init_queue(do_dasd_request,
3005 &block->request_queue_lock);
3006 if (block->request_queue == NULL)
3009 block->request_queue->queuedata = block;
3015 * Allocate and initialize request queue.
3017 static void dasd_setup_queue(struct dasd_block *block)
3021 if (block->base->features & DASD_FEATURE_USERAW) {
3023 * the max_blocks value for raw_track access is 256
3024 * it is higher than the native ECKD value because we
3025 * only need one ccw per track
3026 * so the max_hw_sectors are
3027 * 2048 x 512B = 1024kB = 16 tracks
3031 max = block->base->discipline->max_blocks << block->s2b_shift;
3033 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, block->request_queue);
3034 blk_queue_logical_block_size(block->request_queue,
3036 blk_queue_max_hw_sectors(block->request_queue, max);
3037 blk_queue_max_segments(block->request_queue, -1L);
3038 /* with page sized segments we can translate each segement into
3041 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
3042 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
3046 * Deactivate and free request queue.
3048 static void dasd_free_queue(struct dasd_block *block)
3050 if (block->request_queue) {
3051 blk_cleanup_queue(block->request_queue);
3052 block->request_queue = NULL;
3057 * Flush request on the request queue.
3059 static void dasd_flush_request_queue(struct dasd_block *block)
3061 struct request *req;
3063 if (!block->request_queue)
3066 spin_lock_irq(&block->request_queue_lock);
3067 while ((req = blk_fetch_request(block->request_queue)))
3068 __blk_end_request_all(req, -EIO);
3069 spin_unlock_irq(&block->request_queue_lock);
3072 static int dasd_open(struct block_device *bdev, fmode_t mode)
3074 struct dasd_device *base;
3077 base = dasd_device_from_gendisk(bdev->bd_disk);
3081 atomic_inc(&base->block->open_count);
3082 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
3087 if (!try_module_get(base->discipline->owner)) {
3092 if (dasd_probeonly) {
3093 dev_info(&base->cdev->dev,
3094 "Accessing the DASD failed because it is in "
3095 "probeonly mode\n");
3100 if (base->state <= DASD_STATE_BASIC) {
3101 DBF_DEV_EVENT(DBF_ERR, base, " %s",
3102 " Cannot open unrecognized device");
3107 if ((mode & FMODE_WRITE) &&
3108 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
3109 (base->features & DASD_FEATURE_READONLY))) {
3114 dasd_put_device(base);
3118 module_put(base->discipline->owner);
3120 atomic_dec(&base->block->open_count);
3121 dasd_put_device(base);
3125 static void dasd_release(struct gendisk *disk, fmode_t mode)
3127 struct dasd_device *base = dasd_device_from_gendisk(disk);
3129 atomic_dec(&base->block->open_count);
3130 module_put(base->discipline->owner);
3131 dasd_put_device(base);
3136 * Return disk geometry.
3138 static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3140 struct dasd_device *base;
3142 base = dasd_device_from_gendisk(bdev->bd_disk);
3146 if (!base->discipline ||
3147 !base->discipline->fill_geometry) {
3148 dasd_put_device(base);
3151 base->discipline->fill_geometry(base->block, geo);
3152 geo->start = get_start_sect(bdev) >> base->block->s2b_shift;
3153 dasd_put_device(base);
3157 const struct block_device_operations
3158 dasd_device_operations = {
3159 .owner = THIS_MODULE,
3161 .release = dasd_release,
3162 .ioctl = dasd_ioctl,
3163 .compat_ioctl = dasd_ioctl,
3164 .getgeo = dasd_getgeo,
3167 /*******************************************************************************
3168 * end of block device operations
3174 #ifdef CONFIG_PROC_FS
3178 if (dasd_page_cache != NULL) {
3179 kmem_cache_destroy(dasd_page_cache);
3180 dasd_page_cache = NULL;
3182 dasd_gendisk_exit();
3184 if (dasd_debug_area != NULL) {
3185 debug_unregister(dasd_debug_area);
3186 dasd_debug_area = NULL;
3188 dasd_statistics_removeroot();
3192 * SECTION: common functions for ccw_driver use
3196 * Is the device read-only?
3197 * Note that this function does not report the setting of the
3198 * readonly device attribute, but how it is configured in z/VM.
3200 int dasd_device_is_ro(struct dasd_device *device)
3202 struct ccw_dev_id dev_id;
3203 struct diag210 diag_data;
3208 ccw_device_get_id(device->cdev, &dev_id);
3209 memset(&diag_data, 0, sizeof(diag_data));
3210 diag_data.vrdcdvno = dev_id.devno;
3211 diag_data.vrdclen = sizeof(diag_data);
3212 rc = diag210(&diag_data);
3213 if (rc == 0 || rc == 2) {
3214 return diag_data.vrdcvfla & 0x80;
3216 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
3221 EXPORT_SYMBOL_GPL(dasd_device_is_ro);
3223 static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
3225 struct ccw_device *cdev = data;
3228 ret = ccw_device_set_online(cdev);
3230 pr_warn("%s: Setting the DASD online failed with rc=%d\n",
3231 dev_name(&cdev->dev), ret);
3235 * Initial attempt at a probe function. this can be simplified once
3236 * the other detection code is gone.
3238 int dasd_generic_probe(struct ccw_device *cdev,
3239 struct dasd_discipline *discipline)
3243 ret = dasd_add_sysfs_files(cdev);
3245 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
3246 "dasd_generic_probe: could not add "
3250 cdev->handler = &dasd_int_handler;
3253 * Automatically online either all dasd devices (dasd_autodetect)
3254 * or all devices specified with dasd= parameters during
3257 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
3258 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
3259 async_schedule(dasd_generic_auto_online, cdev);
3262 EXPORT_SYMBOL_GPL(dasd_generic_probe);
3265 * This will one day be called from a global not_oper handler.
3266 * It is also used by driver_unregister during module unload.
3268 void dasd_generic_remove(struct ccw_device *cdev)
3270 struct dasd_device *device;
3271 struct dasd_block *block;
3273 cdev->handler = NULL;
3275 device = dasd_device_from_cdev(cdev);
3276 if (IS_ERR(device)) {
3277 dasd_remove_sysfs_files(cdev);
3280 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3281 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3282 /* Already doing offline processing */
3283 dasd_put_device(device);
3284 dasd_remove_sysfs_files(cdev);
3288 * This device is removed unconditionally. Set offline
3289 * flag to prevent dasd_open from opening it while it is
3290 * no quite down yet.
3292 dasd_set_target_state(device, DASD_STATE_NEW);
3293 /* dasd_delete_device destroys the device reference. */
3294 block = device->block;
3295 dasd_delete_device(device);
3297 * life cycle of block is bound to device, so delete it after
3298 * device was safely removed
3301 dasd_free_block(block);
3303 dasd_remove_sysfs_files(cdev);
3305 EXPORT_SYMBOL_GPL(dasd_generic_remove);
3308 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
3309 * the device is detected for the first time and is supposed to be used
3310 * or the user has started activation through sysfs.
3312 int dasd_generic_set_online(struct ccw_device *cdev,
3313 struct dasd_discipline *base_discipline)
3315 struct dasd_discipline *discipline;
3316 struct dasd_device *device;
3319 /* first online clears initial online feature flag */
3320 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
3321 device = dasd_create_device(cdev);
3323 return PTR_ERR(device);
3325 discipline = base_discipline;
3326 if (device->features & DASD_FEATURE_USEDIAG) {
3327 if (!dasd_diag_discipline_pointer) {
3328 /* Try to load the required module. */
3329 rc = request_module(DASD_DIAG_MOD);
3331 pr_warn("%s Setting the DASD online failed "
3332 "because the required module %s "
3333 "could not be loaded (rc=%d)\n",
3334 dev_name(&cdev->dev), DASD_DIAG_MOD,
3336 dasd_delete_device(device);
3340 /* Module init could have failed, so check again here after
3341 * request_module(). */
3342 if (!dasd_diag_discipline_pointer) {
3343 pr_warn("%s Setting the DASD online failed because of missing DIAG discipline\n",
3344 dev_name(&cdev->dev));
3345 dasd_delete_device(device);
3348 discipline = dasd_diag_discipline_pointer;
3350 if (!try_module_get(base_discipline->owner)) {
3351 dasd_delete_device(device);
3354 if (!try_module_get(discipline->owner)) {
3355 module_put(base_discipline->owner);
3356 dasd_delete_device(device);
3359 device->base_discipline = base_discipline;
3360 device->discipline = discipline;
3362 /* check_device will allocate block device if necessary */
3363 rc = discipline->check_device(device);
3365 pr_warn("%s Setting the DASD online with discipline %s failed with rc=%i\n",
3366 dev_name(&cdev->dev), discipline->name, rc);
3367 module_put(discipline->owner);
3368 module_put(base_discipline->owner);
3369 dasd_delete_device(device);
3373 dasd_set_target_state(device, DASD_STATE_ONLINE);
3374 if (device->state <= DASD_STATE_KNOWN) {
3375 pr_warn("%s Setting the DASD online failed because of a missing discipline\n",
3376 dev_name(&cdev->dev));
3378 dasd_set_target_state(device, DASD_STATE_NEW);
3380 dasd_free_block(device->block);
3381 dasd_delete_device(device);
3383 pr_debug("dasd_generic device %s found\n",
3384 dev_name(&cdev->dev));
3386 wait_event(dasd_init_waitq, _wait_for_device(device));
3388 dasd_put_device(device);
3391 EXPORT_SYMBOL_GPL(dasd_generic_set_online);
3393 int dasd_generic_set_offline(struct ccw_device *cdev)
3395 struct dasd_device *device;
3396 struct dasd_block *block;
3397 int max_count, open_count, rc;
3400 device = dasd_device_from_cdev(cdev);
3402 return PTR_ERR(device);
3405 * We must make sure that this device is currently not in use.
3406 * The open_count is increased for every opener, that includes
3407 * the blkdev_get in dasd_scan_partitions. We are only interested
3408 * in the other openers.
3410 if (device->block) {
3411 max_count = device->block->bdev ? 0 : -1;
3412 open_count = atomic_read(&device->block->open_count);
3413 if (open_count > max_count) {
3415 pr_warn("%s: The DASD cannot be set offline with open count %i\n",
3416 dev_name(&cdev->dev), open_count);
3418 pr_warn("%s: The DASD cannot be set offline while it is in use\n",
3419 dev_name(&cdev->dev));
3420 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3421 dasd_put_device(device);
3426 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3428 * safe offline already running
3429 * could only be called by normal offline so safe_offline flag
3430 * needs to be removed to run normal offline and kill all I/O
3432 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3433 /* Already doing normal offline processing */
3434 dasd_put_device(device);
3437 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
3440 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3441 /* Already doing offline processing */
3442 dasd_put_device(device);
3447 * if safe_offline called set safe_offline_running flag and
3448 * clear safe_offline so that a call to normal offline
3449 * can overrun safe_offline processing
3451 if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags) &&
3452 !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3454 * If we want to set the device safe offline all IO operations
3455 * should be finished before continuing the offline process
3456 * so sync bdev first and then wait for our queues to become
3459 /* sync blockdev and partitions */
3460 rc = fsync_bdev(device->block->bdev);
3464 /* schedule device tasklet and wait for completion */
3465 dasd_schedule_device_bh(device);
3466 rc = wait_event_interruptible(shutdown_waitq,
3467 _wait_for_empty_queues(device));
3472 set_bit(DASD_FLAG_OFFLINE, &device->flags);
3473 dasd_set_target_state(device, DASD_STATE_NEW);
3474 /* dasd_delete_device destroys the device reference. */
3475 block = device->block;
3476 dasd_delete_device(device);
3478 * life cycle of block is bound to device, so delete it after
3479 * device was safely removed
3482 dasd_free_block(block);
3486 /* interrupted by signal */
3487 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
3488 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags);
3489 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3490 dasd_put_device(device);
3493 EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
3495 int dasd_generic_last_path_gone(struct dasd_device *device)
3497 struct dasd_ccw_req *cqr;
3499 dev_warn(&device->cdev->dev, "No operational channel path is left "
3500 "for the device\n");
3501 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
3502 /* First of all call extended error reporting. */
3503 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3505 if (device->state < DASD_STATE_BASIC)
3507 /* Device is active. We want to keep it. */
3508 list_for_each_entry(cqr, &device->ccw_queue, devlist)
3509 if ((cqr->status == DASD_CQR_IN_IO) ||
3510 (cqr->status == DASD_CQR_CLEAR_PENDING)) {
3511 cqr->status = DASD_CQR_QUEUED;
3514 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
3515 dasd_device_clear_timer(device);
3516 dasd_schedule_device_bh(device);
3519 EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
3521 int dasd_generic_path_operational(struct dasd_device *device)
3523 dev_info(&device->cdev->dev, "A channel path to the device has become "
3525 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
3526 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
3527 if (device->stopped & DASD_UNRESUMED_PM) {
3528 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
3529 dasd_restore_device(device);
3532 dasd_schedule_device_bh(device);
3534 dasd_schedule_block_bh(device->block);
3536 if (!device->stopped)
3537 wake_up(&generic_waitq);
3541 EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
3543 int dasd_generic_notify(struct ccw_device *cdev, int event)
3545 struct dasd_device *device;
3548 device = dasd_device_from_cdev_locked(cdev);
3556 device->path_data.opm = 0;
3557 device->path_data.ppm = 0;
3558 device->path_data.npm = 0;
3559 ret = dasd_generic_last_path_gone(device);
3563 if (device->path_data.opm)
3564 ret = dasd_generic_path_operational(device);
3567 dasd_put_device(device);
3570 EXPORT_SYMBOL_GPL(dasd_generic_notify);
3572 void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
3575 __u8 oldopm, eventlpm;
3576 struct dasd_device *device;
3578 device = dasd_device_from_cdev_locked(cdev);
3581 for (chp = 0; chp < 8; chp++) {
3582 eventlpm = 0x80 >> chp;
3583 if (path_event[chp] & PE_PATH_GONE) {
3584 oldopm = device->path_data.opm;
3585 device->path_data.opm &= ~eventlpm;
3586 device->path_data.ppm &= ~eventlpm;
3587 device->path_data.npm &= ~eventlpm;
3588 if (oldopm && !device->path_data.opm) {
3589 dev_warn(&device->cdev->dev,
3590 "No verified channel paths remain "
3591 "for the device\n");
3592 DBF_DEV_EVENT(DBF_WARNING, device,
3593 "%s", "last verified path gone");
3594 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3595 dasd_device_set_stop_bits(device,
3596 DASD_STOPPED_DC_WAIT);
3599 if (path_event[chp] & PE_PATH_AVAILABLE) {
3600 device->path_data.opm &= ~eventlpm;
3601 device->path_data.ppm &= ~eventlpm;
3602 device->path_data.npm &= ~eventlpm;
3603 device->path_data.tbvpm |= eventlpm;
3604 dasd_schedule_device_bh(device);
3606 if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) {
3607 if (!(device->path_data.opm & eventlpm) &&
3608 !(device->path_data.tbvpm & eventlpm)) {
3610 * we can not establish a pathgroup on an
3611 * unavailable path, so trigger a path
3612 * verification first
3614 device->path_data.tbvpm |= eventlpm;
3615 dasd_schedule_device_bh(device);
3617 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3618 "Pathgroup re-established\n");
3619 if (device->discipline->kick_validate)
3620 device->discipline->kick_validate(device);
3623 dasd_put_device(device);
3625 EXPORT_SYMBOL_GPL(dasd_generic_path_event);
3627 int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
3629 if (!device->path_data.opm && lpm) {
3630 device->path_data.opm = lpm;
3631 dasd_generic_path_operational(device);
3633 device->path_data.opm |= lpm;
3636 EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
3639 int dasd_generic_pm_freeze(struct ccw_device *cdev)
3641 struct dasd_device *device = dasd_device_from_cdev(cdev);
3642 struct list_head freeze_queue;
3643 struct dasd_ccw_req *cqr, *n;
3644 struct dasd_ccw_req *refers;
3648 return PTR_ERR(device);
3650 /* mark device as suspended */
3651 set_bit(DASD_FLAG_SUSPENDED, &device->flags);
3653 if (device->discipline->freeze)
3654 rc = device->discipline->freeze(device);
3656 /* disallow new I/O */
3657 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
3659 /* clear active requests and requeue them to block layer if possible */
3660 INIT_LIST_HEAD(&freeze_queue);
3661 spin_lock_irq(get_ccwdev_lock(cdev));
3663 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
3664 /* Check status and move request to flush_queue */
3665 if (cqr->status == DASD_CQR_IN_IO) {
3666 rc = device->discipline->term_IO(cqr);
3668 /* unable to terminate requeust */
3669 dev_err(&device->cdev->dev,
3670 "Unable to terminate request %p "
3671 "on suspend\n", cqr);
3672 spin_unlock_irq(get_ccwdev_lock(cdev));
3673 dasd_put_device(device);
3677 list_move_tail(&cqr->devlist, &freeze_queue);
3679 spin_unlock_irq(get_ccwdev_lock(cdev));
3681 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
3682 wait_event(dasd_flush_wq,
3683 (cqr->status != DASD_CQR_CLEAR_PENDING));
3684 if (cqr->status == DASD_CQR_CLEARED)
3685 cqr->status = DASD_CQR_QUEUED;
3687 /* requeue requests to blocklayer will only work for
3688 block device requests */
3689 if (_dasd_requeue_request(cqr))
3692 /* remove requests from device and block queue */
3693 list_del_init(&cqr->devlist);
3694 while (cqr->refers != NULL) {
3695 refers = cqr->refers;
3696 /* remove the request from the block queue */
3697 list_del(&cqr->blocklist);
3698 /* free the finished erp request */
3699 dasd_free_erp_request(cqr, cqr->memdev);
3703 list_del_init(&cqr->blocklist);
3704 cqr->block->base->discipline->free_cp(
3705 cqr, (struct request *) cqr->callback_data);
3709 * if requests remain then they are internal request
3710 * and go back to the device queue
3712 if (!list_empty(&freeze_queue)) {
3713 /* move freeze_queue to start of the ccw_queue */
3714 spin_lock_irq(get_ccwdev_lock(cdev));
3715 list_splice_tail(&freeze_queue, &device->ccw_queue);
3716 spin_unlock_irq(get_ccwdev_lock(cdev));
3718 dasd_put_device(device);
3721 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
3723 int dasd_generic_restore_device(struct ccw_device *cdev)
3725 struct dasd_device *device = dasd_device_from_cdev(cdev);
3729 return PTR_ERR(device);
3731 /* allow new IO again */
3732 dasd_device_remove_stop_bits(device,
3733 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
3735 dasd_schedule_device_bh(device);
3738 * call discipline restore function
3739 * if device is stopped do nothing e.g. for disconnected devices
3741 if (device->discipline->restore && !(device->stopped))
3742 rc = device->discipline->restore(device);
3743 if (rc || device->stopped)
3745 * if the resume failed for the DASD we put it in
3746 * an UNRESUMED stop state
3748 device->stopped |= DASD_UNRESUMED_PM;
3751 dasd_schedule_block_bh(device->block);
3753 clear_bit(DASD_FLAG_SUSPENDED, &device->flags);
3754 dasd_put_device(device);
3757 EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
3759 static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
3761 int rdc_buffer_size,
3764 struct dasd_ccw_req *cqr;
3766 unsigned long *idaw;
3768 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
3771 /* internal error 13 - Allocating the RDC request failed*/
3772 dev_err(&device->cdev->dev,
3773 "An error occurred in the DASD device driver, "
3774 "reason=%s\n", "13");
3779 ccw->cmd_code = CCW_CMD_RDC;
3780 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
3781 idaw = (unsigned long *) (cqr->data);
3782 ccw->cda = (__u32)(addr_t) idaw;
3783 ccw->flags = CCW_FLAG_IDA;
3784 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
3786 ccw->cda = (__u32)(addr_t) rdc_buffer;
3790 ccw->count = rdc_buffer_size;
3791 cqr->startdev = device;
3792 cqr->memdev = device;
3793 cqr->expires = 10*HZ;
3795 cqr->buildclk = get_tod_clock();
3796 cqr->status = DASD_CQR_FILLED;
3801 int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
3802 void *rdc_buffer, int rdc_buffer_size)
3805 struct dasd_ccw_req *cqr;
3807 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
3810 return PTR_ERR(cqr);
3812 ret = dasd_sleep_on(cqr);
3813 dasd_sfree_request(cqr, cqr->memdev);
3816 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
3819 * In command mode and transport mode we need to look for sense
3820 * data in different places. The sense data itself is allways
3821 * an array of 32 bytes, so we can unify the sense data access
3824 char *dasd_get_sense(struct irb *irb)
3826 struct tsb *tsb = NULL;
3829 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
3830 if (irb->scsw.tm.tcw)
3831 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
3833 if (tsb && tsb->length == 64 && tsb->flags)
3834 switch (tsb->flags & 0x07) {
3835 case 1: /* tsa_iostat */
3836 sense = tsb->tsa.iostat.sense;
3838 case 2: /* tsa_ddpc */
3839 sense = tsb->tsa.ddpc.sense;
3842 /* currently we don't use interrogate data */
3845 } else if (irb->esw.esw0.erw.cons) {
3850 EXPORT_SYMBOL_GPL(dasd_get_sense);
3852 void dasd_generic_shutdown(struct ccw_device *cdev)
3854 struct dasd_device *device;
3856 device = dasd_device_from_cdev(cdev);
3861 dasd_schedule_block_bh(device->block);
3863 dasd_schedule_device_bh(device);
3865 wait_event(shutdown_waitq, _wait_for_empty_queues(device));
3867 EXPORT_SYMBOL_GPL(dasd_generic_shutdown);
3869 static int __init dasd_init(void)
3873 init_waitqueue_head(&dasd_init_waitq);
3874 init_waitqueue_head(&dasd_flush_wq);
3875 init_waitqueue_head(&generic_waitq);
3876 init_waitqueue_head(&shutdown_waitq);
3878 /* register 'common' DASD debug area, used for all DBF_XXX calls */
3879 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
3880 if (dasd_debug_area == NULL) {
3884 debug_register_view(dasd_debug_area, &debug_sprintf_view);
3885 debug_set_level(dasd_debug_area, DBF_WARNING);
3887 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
3889 dasd_diag_discipline_pointer = NULL;
3891 dasd_statistics_createroot();
3893 rc = dasd_devmap_init();
3896 rc = dasd_gendisk_init();
3902 rc = dasd_eer_init();
3905 #ifdef CONFIG_PROC_FS
3906 rc = dasd_proc_init();
3913 pr_info("The DASD device driver could not be initialized\n");
3918 module_init(dasd_init);
3919 module_exit(dasd_exit);