1 // SPDX-License-Identifier: GPL-2.0
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * Copyright IBM Corp. 1999, 2009
11 #define KMSG_COMPONENT "dasd"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14 #include <linux/kmod.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/ctype.h>
18 #include <linux/major.h>
19 #include <linux/slab.h>
20 #include <linux/hdreg.h>
21 #include <linux/async.h>
22 #include <linux/mutex.h>
23 #include <linux/debugfs.h>
24 #include <linux/seq_file.h>
25 #include <linux/vmalloc.h>
27 #include <asm/ccwdev.h>
28 #include <asm/ebcdic.h>
29 #include <asm/idals.h>
34 #define PRINTK_HEADER "dasd:"
38 * SECTION: Constant definitions to be used within this file
40 #define DASD_CHANQ_MAX_SIZE 4
42 #define DASD_DIAG_MOD "dasd_diag_mod"
45 * SECTION: exported variables of dasd.c
47 debug_info_t *dasd_debug_area;
48 EXPORT_SYMBOL(dasd_debug_area);
49 static struct dentry *dasd_debugfs_root_entry;
50 struct dasd_discipline *dasd_diag_discipline_pointer;
51 EXPORT_SYMBOL(dasd_diag_discipline_pointer);
52 void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
54 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
55 MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
56 " Copyright IBM Corp. 2000");
57 MODULE_SUPPORTED_DEVICE("dasd");
58 MODULE_LICENSE("GPL");
61 * SECTION: prototypes for static functions of dasd.c
63 static int dasd_alloc_queue(struct dasd_block *);
64 static void dasd_setup_queue(struct dasd_block *);
65 static void dasd_free_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 do_requeue_requests(struct work_struct *);
73 static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
74 static void dasd_device_timeout(struct timer_list *);
75 static void dasd_block_timeout(struct timer_list *);
76 static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *);
77 static void dasd_profile_init(struct dasd_profile *, struct dentry *);
78 static void dasd_profile_exit(struct dasd_profile *);
79 static void dasd_hosts_init(struct dentry *, struct dasd_device *);
80 static void dasd_hosts_exit(struct dasd_device *);
83 * SECTION: Operations on the device structure.
85 static wait_queue_head_t dasd_init_waitq;
86 static wait_queue_head_t dasd_flush_wq;
87 static wait_queue_head_t generic_waitq;
88 static wait_queue_head_t shutdown_waitq;
91 * Allocate memory for a new device structure.
93 struct dasd_device *dasd_alloc_device(void)
95 struct dasd_device *device;
97 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC);
99 return ERR_PTR(-ENOMEM);
101 /* Get two pages for normal block device operations. */
102 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
103 if (!device->ccw_mem) {
105 return ERR_PTR(-ENOMEM);
107 /* Get one page for error recovery. */
108 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
109 if (!device->erp_mem) {
110 free_pages((unsigned long) device->ccw_mem, 1);
112 return ERR_PTR(-ENOMEM);
115 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
116 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
117 spin_lock_init(&device->mem_lock);
118 atomic_set(&device->tasklet_scheduled, 0);
119 tasklet_init(&device->tasklet,
120 (void (*)(unsigned long)) dasd_device_tasklet,
121 (unsigned long) device);
122 INIT_LIST_HEAD(&device->ccw_queue);
123 timer_setup(&device->timer, dasd_device_timeout, 0);
124 INIT_WORK(&device->kick_work, do_kick_device);
125 INIT_WORK(&device->restore_device, do_restore_device);
126 INIT_WORK(&device->reload_device, do_reload_device);
127 INIT_WORK(&device->requeue_requests, do_requeue_requests);
128 device->state = DASD_STATE_NEW;
129 device->target = DASD_STATE_NEW;
130 mutex_init(&device->state_mutex);
131 spin_lock_init(&device->profile.lock);
136 * Free memory of a device structure.
138 void dasd_free_device(struct dasd_device *device)
140 kfree(device->private);
141 free_page((unsigned long) device->erp_mem);
142 free_pages((unsigned long) device->ccw_mem, 1);
147 * Allocate memory for a new device structure.
149 struct dasd_block *dasd_alloc_block(void)
151 struct dasd_block *block;
153 block = kzalloc(sizeof(*block), GFP_ATOMIC);
155 return ERR_PTR(-ENOMEM);
156 /* open_count = 0 means device online but not in use */
157 atomic_set(&block->open_count, -1);
159 atomic_set(&block->tasklet_scheduled, 0);
160 tasklet_init(&block->tasklet,
161 (void (*)(unsigned long)) dasd_block_tasklet,
162 (unsigned long) block);
163 INIT_LIST_HEAD(&block->ccw_queue);
164 spin_lock_init(&block->queue_lock);
165 timer_setup(&block->timer, dasd_block_timeout, 0);
166 spin_lock_init(&block->profile.lock);
170 EXPORT_SYMBOL_GPL(dasd_alloc_block);
173 * Free memory of a device structure.
175 void dasd_free_block(struct dasd_block *block)
179 EXPORT_SYMBOL_GPL(dasd_free_block);
182 * Make a new device known to the system.
184 static int dasd_state_new_to_known(struct dasd_device *device)
189 * As long as the device is not in state DASD_STATE_NEW we want to
190 * keep the reference count > 0.
192 dasd_get_device(device);
195 rc = dasd_alloc_queue(device->block);
197 dasd_put_device(device);
201 device->state = DASD_STATE_KNOWN;
206 * Let the system forget about a device.
208 static int dasd_state_known_to_new(struct dasd_device *device)
210 /* Disable extended error reporting for this device. */
211 dasd_eer_disable(device);
212 device->state = DASD_STATE_NEW;
215 dasd_free_queue(device->block);
217 /* Give up reference we took in dasd_state_new_to_known. */
218 dasd_put_device(device);
222 static struct dentry *dasd_debugfs_setup(const char *name,
223 struct dentry *base_dentry)
229 pde = debugfs_create_dir(name, base_dentry);
230 if (!pde || IS_ERR(pde))
236 * Request the irq line for the device.
238 static int dasd_state_known_to_basic(struct dasd_device *device)
240 struct dasd_block *block = device->block;
243 /* Allocate and register gendisk structure. */
245 rc = dasd_gendisk_alloc(block);
248 block->debugfs_dentry =
249 dasd_debugfs_setup(block->gdp->disk_name,
250 dasd_debugfs_root_entry);
251 dasd_profile_init(&block->profile, block->debugfs_dentry);
252 if (dasd_global_profile_level == DASD_PROFILE_ON)
253 dasd_profile_on(&device->block->profile);
255 device->debugfs_dentry =
256 dasd_debugfs_setup(dev_name(&device->cdev->dev),
257 dasd_debugfs_root_entry);
258 dasd_profile_init(&device->profile, device->debugfs_dentry);
259 dasd_hosts_init(device->debugfs_dentry, device);
261 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
262 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1,
264 debug_register_view(device->debug_area, &debug_sprintf_view);
265 debug_set_level(device->debug_area, DBF_WARNING);
266 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
268 device->state = DASD_STATE_BASIC;
274 * Release the irq line for the device. Terminate any running i/o.
276 static int dasd_state_basic_to_known(struct dasd_device *device)
280 if (device->discipline->basic_to_known) {
281 rc = device->discipline->basic_to_known(device);
287 dasd_profile_exit(&device->block->profile);
288 debugfs_remove(device->block->debugfs_dentry);
289 dasd_gendisk_free(device->block);
290 dasd_block_clear_timer(device->block);
292 rc = dasd_flush_device_queue(device);
295 dasd_device_clear_timer(device);
296 dasd_profile_exit(&device->profile);
297 dasd_hosts_exit(device);
298 debugfs_remove(device->debugfs_dentry);
299 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
300 if (device->debug_area != NULL) {
301 debug_unregister(device->debug_area);
302 device->debug_area = NULL;
304 device->state = DASD_STATE_KNOWN;
309 * Do the initial analysis. The do_analysis function may return
310 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
311 * until the discipline decides to continue the startup sequence
312 * by calling the function dasd_change_state. The eckd disciplines
313 * uses this to start a ccw that detects the format. The completion
314 * interrupt for this detection ccw uses the kernel event daemon to
315 * trigger the call to dasd_change_state. All this is done in the
316 * discipline code, see dasd_eckd.c.
317 * After the analysis ccw is done (do_analysis returned 0) the block
319 * In case the analysis returns an error, the device setup is stopped
320 * (a fake disk was already added to allow formatting).
322 static int dasd_state_basic_to_ready(struct dasd_device *device)
325 struct dasd_block *block;
326 struct gendisk *disk;
329 block = device->block;
330 /* make disk known with correct capacity */
332 if (block->base->discipline->do_analysis != NULL)
333 rc = block->base->discipline->do_analysis(block);
336 device->state = DASD_STATE_UNFMT;
337 disk = device->block->gdp;
338 kobject_uevent(&disk_to_dev(disk)->kobj,
344 dasd_setup_queue(block);
345 set_capacity(block->gdp,
346 block->blocks << block->s2b_shift);
347 device->state = DASD_STATE_READY;
348 rc = dasd_scan_partitions(block);
350 device->state = DASD_STATE_BASIC;
354 device->state = DASD_STATE_READY;
357 if (device->discipline->basic_to_ready)
358 rc = device->discipline->basic_to_ready(device);
363 int _wait_for_empty_queues(struct dasd_device *device)
366 return list_empty(&device->ccw_queue) &&
367 list_empty(&device->block->ccw_queue);
369 return list_empty(&device->ccw_queue);
373 * Remove device from block device layer. Destroy dirty buffers.
374 * Forget format information. Check if the target level is basic
375 * and if it is create fake disk for formatting.
377 static int dasd_state_ready_to_basic(struct dasd_device *device)
381 device->state = DASD_STATE_BASIC;
383 struct dasd_block *block = device->block;
384 rc = dasd_flush_block_queue(block);
386 device->state = DASD_STATE_READY;
389 dasd_destroy_partitions(block);
392 block->s2b_shift = 0;
400 static int dasd_state_unfmt_to_basic(struct dasd_device *device)
402 device->state = DASD_STATE_BASIC;
407 * Make the device online and schedule the bottom half to start
408 * the requeueing of requests from the linux request queue to the
412 dasd_state_ready_to_online(struct dasd_device * device)
414 struct gendisk *disk;
415 struct disk_part_iter piter;
416 struct hd_struct *part;
418 device->state = DASD_STATE_ONLINE;
420 dasd_schedule_block_bh(device->block);
421 if ((device->features & DASD_FEATURE_USERAW)) {
422 disk = device->block->gdp;
423 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
426 disk = device->block->bdev->bd_disk;
427 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
428 while ((part = disk_part_iter_next(&piter)))
429 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
430 disk_part_iter_exit(&piter);
436 * Stop the requeueing of requests again.
438 static int dasd_state_online_to_ready(struct dasd_device *device)
441 struct gendisk *disk;
442 struct disk_part_iter piter;
443 struct hd_struct *part;
445 if (device->discipline->online_to_ready) {
446 rc = device->discipline->online_to_ready(device);
451 device->state = DASD_STATE_READY;
452 if (device->block && !(device->features & DASD_FEATURE_USERAW)) {
453 disk = device->block->bdev->bd_disk;
454 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
455 while ((part = disk_part_iter_next(&piter)))
456 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
457 disk_part_iter_exit(&piter);
463 * Device startup state changes.
465 static int dasd_increase_state(struct dasd_device *device)
470 if (device->state == DASD_STATE_NEW &&
471 device->target >= DASD_STATE_KNOWN)
472 rc = dasd_state_new_to_known(device);
475 device->state == DASD_STATE_KNOWN &&
476 device->target >= DASD_STATE_BASIC)
477 rc = dasd_state_known_to_basic(device);
480 device->state == DASD_STATE_BASIC &&
481 device->target >= DASD_STATE_READY)
482 rc = dasd_state_basic_to_ready(device);
485 device->state == DASD_STATE_UNFMT &&
486 device->target > DASD_STATE_UNFMT)
490 device->state == DASD_STATE_READY &&
491 device->target >= DASD_STATE_ONLINE)
492 rc = dasd_state_ready_to_online(device);
498 * Device shutdown state changes.
500 static int dasd_decrease_state(struct dasd_device *device)
505 if (device->state == DASD_STATE_ONLINE &&
506 device->target <= DASD_STATE_READY)
507 rc = dasd_state_online_to_ready(device);
510 device->state == DASD_STATE_READY &&
511 device->target <= DASD_STATE_BASIC)
512 rc = dasd_state_ready_to_basic(device);
515 device->state == DASD_STATE_UNFMT &&
516 device->target <= DASD_STATE_BASIC)
517 rc = dasd_state_unfmt_to_basic(device);
520 device->state == DASD_STATE_BASIC &&
521 device->target <= DASD_STATE_KNOWN)
522 rc = dasd_state_basic_to_known(device);
525 device->state == DASD_STATE_KNOWN &&
526 device->target <= DASD_STATE_NEW)
527 rc = dasd_state_known_to_new(device);
533 * This is the main startup/shutdown routine.
535 static void dasd_change_state(struct dasd_device *device)
539 if (device->state == device->target)
540 /* Already where we want to go today... */
542 if (device->state < device->target)
543 rc = dasd_increase_state(device);
545 rc = dasd_decrease_state(device);
549 device->target = device->state;
551 /* let user-space know that the device status changed */
552 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
554 if (device->state == device->target)
555 wake_up(&dasd_init_waitq);
559 * Kick starter for devices that did not complete the startup/shutdown
560 * procedure or were sleeping because of a pending state.
561 * dasd_kick_device will schedule a call do do_kick_device to the kernel
564 static void do_kick_device(struct work_struct *work)
566 struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
567 mutex_lock(&device->state_mutex);
568 dasd_change_state(device);
569 mutex_unlock(&device->state_mutex);
570 dasd_schedule_device_bh(device);
571 dasd_put_device(device);
574 void dasd_kick_device(struct dasd_device *device)
576 dasd_get_device(device);
577 /* queue call to dasd_kick_device to the kernel event daemon. */
578 if (!schedule_work(&device->kick_work))
579 dasd_put_device(device);
581 EXPORT_SYMBOL(dasd_kick_device);
584 * dasd_reload_device will schedule a call do do_reload_device to the kernel
587 static void do_reload_device(struct work_struct *work)
589 struct dasd_device *device = container_of(work, struct dasd_device,
591 device->discipline->reload(device);
592 dasd_put_device(device);
595 void dasd_reload_device(struct dasd_device *device)
597 dasd_get_device(device);
598 /* queue call to dasd_reload_device to the kernel event daemon. */
599 if (!schedule_work(&device->reload_device))
600 dasd_put_device(device);
602 EXPORT_SYMBOL(dasd_reload_device);
605 * dasd_restore_device will schedule a call do do_restore_device to the kernel
608 static void do_restore_device(struct work_struct *work)
610 struct dasd_device *device = container_of(work, struct dasd_device,
612 device->cdev->drv->restore(device->cdev);
613 dasd_put_device(device);
616 void dasd_restore_device(struct dasd_device *device)
618 dasd_get_device(device);
619 /* queue call to dasd_restore_device to the kernel event daemon. */
620 if (!schedule_work(&device->restore_device))
621 dasd_put_device(device);
625 * Set the target state for a device and starts the state change.
627 void dasd_set_target_state(struct dasd_device *device, int target)
629 dasd_get_device(device);
630 mutex_lock(&device->state_mutex);
631 /* If we are in probeonly mode stop at DASD_STATE_READY. */
632 if (dasd_probeonly && target > DASD_STATE_READY)
633 target = DASD_STATE_READY;
634 if (device->target != target) {
635 if (device->state == target)
636 wake_up(&dasd_init_waitq);
637 device->target = target;
639 if (device->state != device->target)
640 dasd_change_state(device);
641 mutex_unlock(&device->state_mutex);
642 dasd_put_device(device);
644 EXPORT_SYMBOL(dasd_set_target_state);
647 * Enable devices with device numbers in [from..to].
649 static inline int _wait_for_device(struct dasd_device *device)
651 return (device->state == device->target);
654 void dasd_enable_device(struct dasd_device *device)
656 dasd_set_target_state(device, DASD_STATE_ONLINE);
657 if (device->state <= DASD_STATE_KNOWN)
658 /* No discipline for device found. */
659 dasd_set_target_state(device, DASD_STATE_NEW);
660 /* Now wait for the devices to come up. */
661 wait_event(dasd_init_waitq, _wait_for_device(device));
663 dasd_reload_device(device);
664 if (device->discipline->kick_validate)
665 device->discipline->kick_validate(device);
667 EXPORT_SYMBOL(dasd_enable_device);
670 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
673 unsigned int dasd_global_profile_level = DASD_PROFILE_OFF;
675 #ifdef CONFIG_DASD_PROFILE
676 struct dasd_profile dasd_global_profile = {
677 .lock = __SPIN_LOCK_UNLOCKED(dasd_global_profile.lock),
679 static struct dentry *dasd_debugfs_global_entry;
682 * Add profiling information for cqr before execution.
684 static void dasd_profile_start(struct dasd_block *block,
685 struct dasd_ccw_req *cqr,
689 unsigned int counter;
690 struct dasd_device *device;
692 /* count the length of the chanq for statistics */
694 if (dasd_global_profile_level || block->profile.data)
695 list_for_each(l, &block->ccw_queue)
699 spin_lock(&dasd_global_profile.lock);
700 if (dasd_global_profile.data) {
701 dasd_global_profile.data->dasd_io_nr_req[counter]++;
702 if (rq_data_dir(req) == READ)
703 dasd_global_profile.data->dasd_read_nr_req[counter]++;
705 spin_unlock(&dasd_global_profile.lock);
707 spin_lock(&block->profile.lock);
708 if (block->profile.data) {
709 block->profile.data->dasd_io_nr_req[counter]++;
710 if (rq_data_dir(req) == READ)
711 block->profile.data->dasd_read_nr_req[counter]++;
713 spin_unlock(&block->profile.lock);
716 * We count the request for the start device, even though it may run on
717 * some other device due to error recovery. This way we make sure that
718 * we count each request only once.
720 device = cqr->startdev;
721 if (device->profile.data) {
722 counter = 1; /* request is not yet queued on the start device */
723 list_for_each(l, &device->ccw_queue)
727 spin_lock(&device->profile.lock);
728 if (device->profile.data) {
729 device->profile.data->dasd_io_nr_req[counter]++;
730 if (rq_data_dir(req) == READ)
731 device->profile.data->dasd_read_nr_req[counter]++;
733 spin_unlock(&device->profile.lock);
737 * Add profiling information for cqr after execution.
740 #define dasd_profile_counter(value, index) \
742 for (index = 0; index < 31 && value >> (2+index); index++) \
746 static void dasd_profile_end_add_data(struct dasd_profile_info *data,
759 /* in case of an overflow, reset the whole profile */
760 if (data->dasd_io_reqs == UINT_MAX) {
761 memset(data, 0, sizeof(*data));
762 ktime_get_real_ts64(&data->starttod);
764 data->dasd_io_reqs++;
765 data->dasd_io_sects += sectors;
767 data->dasd_io_alias++;
771 data->dasd_io_secs[sectors_ind]++;
772 data->dasd_io_times[tottime_ind]++;
773 data->dasd_io_timps[tottimeps_ind]++;
774 data->dasd_io_time1[strtime_ind]++;
775 data->dasd_io_time2[irqtime_ind]++;
776 data->dasd_io_time2ps[irqtimeps_ind]++;
777 data->dasd_io_time3[endtime_ind]++;
780 data->dasd_read_reqs++;
781 data->dasd_read_sects += sectors;
783 data->dasd_read_alias++;
785 data->dasd_read_tpm++;
786 data->dasd_read_secs[sectors_ind]++;
787 data->dasd_read_times[tottime_ind]++;
788 data->dasd_read_time1[strtime_ind]++;
789 data->dasd_read_time2[irqtime_ind]++;
790 data->dasd_read_time3[endtime_ind]++;
794 static void dasd_profile_end(struct dasd_block *block,
795 struct dasd_ccw_req *cqr,
798 unsigned long strtime, irqtime, endtime, tottime;
799 unsigned long tottimeps, sectors;
800 struct dasd_device *device;
801 int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind;
802 int irqtime_ind, irqtimeps_ind, endtime_ind;
803 struct dasd_profile_info *data;
805 device = cqr->startdev;
806 if (!(dasd_global_profile_level ||
807 block->profile.data ||
808 device->profile.data))
811 sectors = blk_rq_sectors(req);
812 if (!cqr->buildclk || !cqr->startclk ||
813 !cqr->stopclk || !cqr->endclk ||
817 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
818 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
819 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
820 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
821 tottimeps = tottime / sectors;
823 dasd_profile_counter(sectors, sectors_ind);
824 dasd_profile_counter(tottime, tottime_ind);
825 dasd_profile_counter(tottimeps, tottimeps_ind);
826 dasd_profile_counter(strtime, strtime_ind);
827 dasd_profile_counter(irqtime, irqtime_ind);
828 dasd_profile_counter(irqtime / sectors, irqtimeps_ind);
829 dasd_profile_counter(endtime, endtime_ind);
831 spin_lock(&dasd_global_profile.lock);
832 if (dasd_global_profile.data) {
833 data = dasd_global_profile.data;
834 data->dasd_sum_times += tottime;
835 data->dasd_sum_time_str += strtime;
836 data->dasd_sum_time_irq += irqtime;
837 data->dasd_sum_time_end += endtime;
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 data = block->profile.data;
852 data->dasd_sum_times += tottime;
853 data->dasd_sum_time_str += strtime;
854 data->dasd_sum_time_irq += irqtime;
855 data->dasd_sum_time_end += endtime;
856 dasd_profile_end_add_data(block->profile.data,
857 cqr->startdev != block->base,
859 rq_data_dir(req) == READ,
860 sectors, sectors_ind, tottime_ind,
861 tottimeps_ind, strtime_ind,
862 irqtime_ind, irqtimeps_ind,
865 spin_unlock(&block->profile.lock);
867 spin_lock(&device->profile.lock);
868 if (device->profile.data) {
869 data = device->profile.data;
870 data->dasd_sum_times += tottime;
871 data->dasd_sum_time_str += strtime;
872 data->dasd_sum_time_irq += irqtime;
873 data->dasd_sum_time_end += endtime;
874 dasd_profile_end_add_data(device->profile.data,
875 cqr->startdev != block->base,
877 rq_data_dir(req) == READ,
878 sectors, sectors_ind, tottime_ind,
879 tottimeps_ind, strtime_ind,
880 irqtime_ind, irqtimeps_ind,
883 spin_unlock(&device->profile.lock);
886 void dasd_profile_reset(struct dasd_profile *profile)
888 struct dasd_profile_info *data;
890 spin_lock_bh(&profile->lock);
891 data = profile->data;
893 spin_unlock_bh(&profile->lock);
896 memset(data, 0, sizeof(*data));
897 ktime_get_real_ts64(&data->starttod);
898 spin_unlock_bh(&profile->lock);
901 int dasd_profile_on(struct dasd_profile *profile)
903 struct dasd_profile_info *data;
905 data = kzalloc(sizeof(*data), GFP_KERNEL);
908 spin_lock_bh(&profile->lock);
910 spin_unlock_bh(&profile->lock);
914 ktime_get_real_ts64(&data->starttod);
915 profile->data = data;
916 spin_unlock_bh(&profile->lock);
920 void dasd_profile_off(struct dasd_profile *profile)
922 spin_lock_bh(&profile->lock);
923 kfree(profile->data);
924 profile->data = NULL;
925 spin_unlock_bh(&profile->lock);
928 char *dasd_get_user_string(const char __user *user_buf, size_t user_len)
932 buffer = vmalloc(user_len + 1);
934 return ERR_PTR(-ENOMEM);
935 if (copy_from_user(buffer, user_buf, user_len) != 0) {
937 return ERR_PTR(-EFAULT);
939 /* got the string, now strip linefeed. */
940 if (buffer[user_len - 1] == '\n')
941 buffer[user_len - 1] = 0;
943 buffer[user_len] = 0;
947 static ssize_t dasd_stats_write(struct file *file,
948 const char __user *user_buf,
949 size_t user_len, loff_t *pos)
953 struct seq_file *m = (struct seq_file *)file->private_data;
954 struct dasd_profile *prof = m->private;
956 if (user_len > 65536)
958 buffer = dasd_get_user_string(user_buf, user_len);
960 return PTR_ERR(buffer);
962 str = skip_spaces(buffer);
964 if (strncmp(str, "reset", 5) == 0) {
965 dasd_profile_reset(prof);
966 } else if (strncmp(str, "on", 2) == 0) {
967 rc = dasd_profile_on(prof);
971 if (prof == &dasd_global_profile) {
972 dasd_profile_reset(prof);
973 dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY;
975 } else if (strncmp(str, "off", 3) == 0) {
976 if (prof == &dasd_global_profile)
977 dasd_global_profile_level = DASD_PROFILE_OFF;
978 dasd_profile_off(prof);
986 static void dasd_stats_array(struct seq_file *m, unsigned int *array)
990 for (i = 0; i < 32; i++)
991 seq_printf(m, "%u ", array[i]);
995 static void dasd_stats_seq_print(struct seq_file *m,
996 struct dasd_profile_info *data)
998 seq_printf(m, "start_time %lld.%09ld\n",
999 (s64)data->starttod.tv_sec, data->starttod.tv_nsec);
1000 seq_printf(m, "total_requests %u\n", data->dasd_io_reqs);
1001 seq_printf(m, "total_sectors %u\n", data->dasd_io_sects);
1002 seq_printf(m, "total_pav %u\n", data->dasd_io_alias);
1003 seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm);
1004 seq_printf(m, "avg_total %lu\n", data->dasd_io_reqs ?
1005 data->dasd_sum_times / data->dasd_io_reqs : 0UL);
1006 seq_printf(m, "avg_build_to_ssch %lu\n", data->dasd_io_reqs ?
1007 data->dasd_sum_time_str / data->dasd_io_reqs : 0UL);
1008 seq_printf(m, "avg_ssch_to_irq %lu\n", data->dasd_io_reqs ?
1009 data->dasd_sum_time_irq / data->dasd_io_reqs : 0UL);
1010 seq_printf(m, "avg_irq_to_end %lu\n", data->dasd_io_reqs ?
1011 data->dasd_sum_time_end / data->dasd_io_reqs : 0UL);
1012 seq_puts(m, "histogram_sectors ");
1013 dasd_stats_array(m, data->dasd_io_secs);
1014 seq_puts(m, "histogram_io_times ");
1015 dasd_stats_array(m, data->dasd_io_times);
1016 seq_puts(m, "histogram_io_times_weighted ");
1017 dasd_stats_array(m, data->dasd_io_timps);
1018 seq_puts(m, "histogram_time_build_to_ssch ");
1019 dasd_stats_array(m, data->dasd_io_time1);
1020 seq_puts(m, "histogram_time_ssch_to_irq ");
1021 dasd_stats_array(m, data->dasd_io_time2);
1022 seq_puts(m, "histogram_time_ssch_to_irq_weighted ");
1023 dasd_stats_array(m, data->dasd_io_time2ps);
1024 seq_puts(m, "histogram_time_irq_to_end ");
1025 dasd_stats_array(m, data->dasd_io_time3);
1026 seq_puts(m, "histogram_ccw_queue_length ");
1027 dasd_stats_array(m, data->dasd_io_nr_req);
1028 seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs);
1029 seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects);
1030 seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias);
1031 seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm);
1032 seq_puts(m, "histogram_read_sectors ");
1033 dasd_stats_array(m, data->dasd_read_secs);
1034 seq_puts(m, "histogram_read_times ");
1035 dasd_stats_array(m, data->dasd_read_times);
1036 seq_puts(m, "histogram_read_time_build_to_ssch ");
1037 dasd_stats_array(m, data->dasd_read_time1);
1038 seq_puts(m, "histogram_read_time_ssch_to_irq ");
1039 dasd_stats_array(m, data->dasd_read_time2);
1040 seq_puts(m, "histogram_read_time_irq_to_end ");
1041 dasd_stats_array(m, data->dasd_read_time3);
1042 seq_puts(m, "histogram_read_ccw_queue_length ");
1043 dasd_stats_array(m, data->dasd_read_nr_req);
1046 static int dasd_stats_show(struct seq_file *m, void *v)
1048 struct dasd_profile *profile;
1049 struct dasd_profile_info *data;
1051 profile = m->private;
1052 spin_lock_bh(&profile->lock);
1053 data = profile->data;
1055 spin_unlock_bh(&profile->lock);
1056 seq_puts(m, "disabled\n");
1059 dasd_stats_seq_print(m, data);
1060 spin_unlock_bh(&profile->lock);
1064 static int dasd_stats_open(struct inode *inode, struct file *file)
1066 struct dasd_profile *profile = inode->i_private;
1067 return single_open(file, dasd_stats_show, profile);
1070 static const struct file_operations dasd_stats_raw_fops = {
1071 .owner = THIS_MODULE,
1072 .open = dasd_stats_open,
1074 .llseek = seq_lseek,
1075 .release = single_release,
1076 .write = dasd_stats_write,
1079 static void dasd_profile_init(struct dasd_profile *profile,
1080 struct dentry *base_dentry)
1087 profile->dentry = NULL;
1088 profile->data = NULL;
1089 mode = (S_IRUSR | S_IWUSR | S_IFREG);
1090 pde = debugfs_create_file("statistics", mode, base_dentry,
1091 profile, &dasd_stats_raw_fops);
1092 if (pde && !IS_ERR(pde))
1093 profile->dentry = pde;
1097 static void dasd_profile_exit(struct dasd_profile *profile)
1099 dasd_profile_off(profile);
1100 debugfs_remove(profile->dentry);
1101 profile->dentry = NULL;
1104 static void dasd_statistics_removeroot(void)
1106 dasd_global_profile_level = DASD_PROFILE_OFF;
1107 dasd_profile_exit(&dasd_global_profile);
1108 debugfs_remove(dasd_debugfs_global_entry);
1109 debugfs_remove(dasd_debugfs_root_entry);
1112 static void dasd_statistics_createroot(void)
1116 dasd_debugfs_root_entry = NULL;
1117 pde = debugfs_create_dir("dasd", NULL);
1118 if (!pde || IS_ERR(pde))
1120 dasd_debugfs_root_entry = pde;
1121 pde = debugfs_create_dir("global", dasd_debugfs_root_entry);
1122 if (!pde || IS_ERR(pde))
1124 dasd_debugfs_global_entry = pde;
1125 dasd_profile_init(&dasd_global_profile, dasd_debugfs_global_entry);
1129 DBF_EVENT(DBF_ERR, "%s",
1130 "Creation of the dasd debugfs interface failed");
1131 dasd_statistics_removeroot();
1136 #define dasd_profile_start(block, cqr, req) do {} while (0)
1137 #define dasd_profile_end(block, cqr, req) do {} while (0)
1139 static void dasd_statistics_createroot(void)
1144 static void dasd_statistics_removeroot(void)
1149 int dasd_stats_generic_show(struct seq_file *m, void *v)
1151 seq_puts(m, "Statistics are not activated in this kernel\n");
1155 static void dasd_profile_init(struct dasd_profile *profile,
1156 struct dentry *base_dentry)
1161 static void dasd_profile_exit(struct dasd_profile *profile)
1166 int dasd_profile_on(struct dasd_profile *profile)
1171 #endif /* CONFIG_DASD_PROFILE */
1173 static int dasd_hosts_show(struct seq_file *m, void *v)
1175 struct dasd_device *device;
1176 int rc = -EOPNOTSUPP;
1178 device = m->private;
1179 dasd_get_device(device);
1181 if (device->discipline->hosts_print)
1182 rc = device->discipline->hosts_print(device, m);
1184 dasd_put_device(device);
1188 static int dasd_hosts_open(struct inode *inode, struct file *file)
1190 struct dasd_device *device = inode->i_private;
1192 return single_open(file, dasd_hosts_show, device);
1195 static const struct file_operations dasd_hosts_fops = {
1196 .owner = THIS_MODULE,
1197 .open = dasd_hosts_open,
1199 .llseek = seq_lseek,
1200 .release = single_release,
1203 static void dasd_hosts_exit(struct dasd_device *device)
1205 debugfs_remove(device->hosts_dentry);
1206 device->hosts_dentry = NULL;
1209 static void dasd_hosts_init(struct dentry *base_dentry,
1210 struct dasd_device *device)
1218 mode = S_IRUSR | S_IFREG;
1219 pde = debugfs_create_file("host_access_list", mode, base_dentry,
1220 device, &dasd_hosts_fops);
1221 if (pde && !IS_ERR(pde))
1222 device->hosts_dentry = pde;
1226 * Allocate memory for a channel program with 'cplength' channel
1227 * command words and 'datasize' additional space. There are two
1228 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
1229 * memory and 2) dasd_smalloc_request uses the static ccw memory
1230 * that gets allocated for each device.
1232 struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
1234 struct dasd_device *device)
1236 struct dasd_ccw_req *cqr;
1239 BUG_ON(datasize > PAGE_SIZE ||
1240 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
1242 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
1244 return ERR_PTR(-ENOMEM);
1247 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
1248 GFP_ATOMIC | GFP_DMA);
1249 if (cqr->cpaddr == NULL) {
1251 return ERR_PTR(-ENOMEM);
1256 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
1257 if (cqr->data == NULL) {
1260 return ERR_PTR(-ENOMEM);
1264 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1265 dasd_get_device(device);
1268 EXPORT_SYMBOL(dasd_kmalloc_request);
1270 struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
1272 struct dasd_device *device)
1274 unsigned long flags;
1275 struct dasd_ccw_req *cqr;
1279 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
1281 size += cplength * sizeof(struct ccw1);
1284 spin_lock_irqsave(&device->mem_lock, flags);
1285 cqr = (struct dasd_ccw_req *)
1286 dasd_alloc_chunk(&device->ccw_chunks, size);
1287 spin_unlock_irqrestore(&device->mem_lock, flags);
1289 return ERR_PTR(-ENOMEM);
1290 memset(cqr, 0, sizeof(struct dasd_ccw_req));
1291 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
1294 cqr->cpaddr = (struct ccw1 *) data;
1295 data += cplength*sizeof(struct ccw1);
1296 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
1301 memset(cqr->data, 0, datasize);
1304 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1305 dasd_get_device(device);
1308 EXPORT_SYMBOL(dasd_smalloc_request);
1311 * Free memory of a channel program. This function needs to free all the
1312 * idal lists that might have been created by dasd_set_cda and the
1313 * struct dasd_ccw_req itself.
1315 void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1319 /* Clear any idals used for the request. */
1322 clear_normalized_cda(ccw);
1323 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
1327 dasd_put_device(device);
1329 EXPORT_SYMBOL(dasd_kfree_request);
1331 void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1333 unsigned long flags;
1335 spin_lock_irqsave(&device->mem_lock, flags);
1336 dasd_free_chunk(&device->ccw_chunks, cqr);
1337 spin_unlock_irqrestore(&device->mem_lock, flags);
1338 dasd_put_device(device);
1340 EXPORT_SYMBOL(dasd_sfree_request);
1343 * Check discipline magic in cqr.
1345 static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
1347 struct dasd_device *device;
1351 device = cqr->startdev;
1352 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
1353 DBF_DEV_EVENT(DBF_WARNING, device,
1354 " dasd_ccw_req 0x%08x magic doesn't match"
1355 " discipline 0x%08x",
1357 *(unsigned int *) device->discipline->name);
1364 * Terminate the current i/o and set the request to clear_pending.
1365 * Timer keeps device runnig.
1366 * ccw_device_clear can fail if the i/o subsystem
1369 int dasd_term_IO(struct dasd_ccw_req *cqr)
1371 struct dasd_device *device;
1373 char errorstring[ERRORLENGTH];
1376 rc = dasd_check_cqr(cqr);
1380 device = (struct dasd_device *) cqr->startdev;
1381 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
1382 rc = ccw_device_clear(device->cdev, (long) cqr);
1384 case 0: /* termination successful */
1385 cqr->status = DASD_CQR_CLEAR_PENDING;
1386 cqr->stopclk = get_tod_clock();
1388 DBF_DEV_EVENT(DBF_DEBUG, device,
1389 "terminate cqr %p successful",
1393 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1394 "device gone, retry");
1398 * device not valid so no I/O could be running
1399 * handle CQR as termination successful
1401 cqr->status = DASD_CQR_CLEARED;
1402 cqr->stopclk = get_tod_clock();
1404 /* no retries for invalid devices */
1406 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1407 "EINVAL, handle as terminated");
1408 /* fake rc to success */
1412 /* internal error 10 - unknown rc*/
1413 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
1414 dev_err(&device->cdev->dev, "An error occurred in the "
1415 "DASD device driver, reason=%s\n", errorstring);
1421 dasd_schedule_device_bh(device);
1424 EXPORT_SYMBOL(dasd_term_IO);
1427 * Start the i/o. This start_IO can fail if the channel is really busy.
1428 * In that case set up a timer to start the request later.
1430 int dasd_start_IO(struct dasd_ccw_req *cqr)
1432 struct dasd_device *device;
1434 char errorstring[ERRORLENGTH];
1437 rc = dasd_check_cqr(cqr);
1442 device = (struct dasd_device *) cqr->startdev;
1444 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) ||
1445 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) &&
1446 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1447 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p "
1448 "because of stolen lock", cqr);
1449 cqr->status = DASD_CQR_ERROR;
1450 cqr->intrc = -EPERM;
1453 if (cqr->retries < 0) {
1454 /* internal error 14 - start_IO run out of retries */
1455 sprintf(errorstring, "14 %p", cqr);
1456 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1457 "device driver, reason=%s\n", errorstring);
1458 cqr->status = DASD_CQR_ERROR;
1461 cqr->startclk = get_tod_clock();
1462 cqr->starttime = jiffies;
1464 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1465 cqr->lpm &= dasd_path_get_opm(device);
1467 cqr->lpm = dasd_path_get_opm(device);
1469 if (cqr->cpmode == 1) {
1470 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
1471 (long) cqr, cqr->lpm);
1473 rc = ccw_device_start(device->cdev, cqr->cpaddr,
1474 (long) cqr, cqr->lpm, 0);
1478 cqr->status = DASD_CQR_IN_IO;
1481 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1482 "start_IO: device busy, retry later");
1485 /* -EACCES indicates that the request used only a subset of the
1486 * available paths and all these paths are gone. If the lpm of
1487 * this request was only a subset of the opm (e.g. the ppm) then
1488 * we just do a retry with all available paths.
1489 * If we already use the full opm, something is amiss, and we
1490 * need a full path verification.
1492 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1493 DBF_DEV_EVENT(DBF_WARNING, device,
1494 "start_IO: selected paths gone (%x)",
1496 } else if (cqr->lpm != dasd_path_get_opm(device)) {
1497 cqr->lpm = dasd_path_get_opm(device);
1498 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
1499 "start_IO: selected paths gone,"
1500 " retry on all paths");
1502 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1503 "start_IO: all paths in opm gone,"
1504 " do path verification");
1505 dasd_generic_last_path_gone(device);
1506 dasd_path_no_path(device);
1507 dasd_path_set_tbvpm(device,
1508 ccw_device_get_path_mask(
1513 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1514 "start_IO: -ENODEV device gone, retry");
1517 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1518 "start_IO: -EIO device gone, retry");
1521 /* most likely caused in power management context */
1522 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1523 "start_IO: -EINVAL device currently "
1527 /* internal error 11 - unknown rc */
1528 snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
1529 dev_err(&device->cdev->dev,
1530 "An error occurred in the DASD device driver, "
1531 "reason=%s\n", errorstring);
1538 EXPORT_SYMBOL(dasd_start_IO);
1541 * Timeout function for dasd devices. This is used for different purposes
1542 * 1) missing interrupt handler for normal operation
1543 * 2) delayed start of request where start_IO failed with -EBUSY
1544 * 3) timeout for missing state change interrupts
1545 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
1546 * DASD_CQR_QUEUED for 2) and 3).
1548 static void dasd_device_timeout(struct timer_list *t)
1550 unsigned long flags;
1551 struct dasd_device *device;
1553 device = from_timer(device, t, timer);
1554 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1555 /* re-activate request queue */
1556 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1557 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1558 dasd_schedule_device_bh(device);
1562 * Setup timeout for a device in jiffies.
1564 void dasd_device_set_timer(struct dasd_device *device, int expires)
1567 del_timer(&device->timer);
1569 mod_timer(&device->timer, jiffies + expires);
1571 EXPORT_SYMBOL(dasd_device_set_timer);
1574 * Clear timeout for a device.
1576 void dasd_device_clear_timer(struct dasd_device *device)
1578 del_timer(&device->timer);
1580 EXPORT_SYMBOL(dasd_device_clear_timer);
1582 static void dasd_handle_killed_request(struct ccw_device *cdev,
1583 unsigned long intparm)
1585 struct dasd_ccw_req *cqr;
1586 struct dasd_device *device;
1590 cqr = (struct dasd_ccw_req *) intparm;
1591 if (cqr->status != DASD_CQR_IN_IO) {
1592 DBF_EVENT_DEVID(DBF_DEBUG, cdev,
1593 "invalid status in handle_killed_request: "
1594 "%02x", cqr->status);
1598 device = dasd_device_from_cdev_locked(cdev);
1599 if (IS_ERR(device)) {
1600 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1601 "unable to get device from cdev");
1605 if (!cqr->startdev ||
1606 device != cqr->startdev ||
1607 strncmp(cqr->startdev->discipline->ebcname,
1608 (char *) &cqr->magic, 4)) {
1609 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1610 "invalid device in request");
1611 dasd_put_device(device);
1615 /* Schedule request to be retried. */
1616 cqr->status = DASD_CQR_QUEUED;
1618 dasd_device_clear_timer(device);
1619 dasd_schedule_device_bh(device);
1620 dasd_put_device(device);
1623 void dasd_generic_handle_state_change(struct dasd_device *device)
1625 /* First of all start sense subsystem status request. */
1626 dasd_eer_snss(device);
1628 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1629 dasd_schedule_device_bh(device);
1630 if (device->block) {
1631 dasd_schedule_block_bh(device->block);
1632 if (device->block->request_queue)
1633 blk_mq_run_hw_queues(device->block->request_queue,
1637 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
1639 static int dasd_check_hpf_error(struct irb *irb)
1641 return (scsw_tm_is_valid_schxs(&irb->scsw) &&
1642 (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX ||
1643 irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX));
1647 * Interrupt handler for "normal" ssch-io based dasd devices.
1649 void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1652 struct dasd_ccw_req *cqr, *next;
1653 struct dasd_device *device;
1655 int nrf_suppressed = 0;
1656 int fp_suppressed = 0;
1660 cqr = (struct dasd_ccw_req *) intparm;
1662 switch (PTR_ERR(irb)) {
1664 if (cqr && cqr->status == DASD_CQR_CLEAR_PENDING) {
1665 device = cqr->startdev;
1666 cqr->status = DASD_CQR_CLEARED;
1667 dasd_device_clear_timer(device);
1668 wake_up(&dasd_flush_wq);
1669 dasd_schedule_device_bh(device);
1674 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1675 "request timed out\n", __func__);
1678 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1679 "unknown error %ld\n", __func__,
1682 dasd_handle_killed_request(cdev, intparm);
1686 now = get_tod_clock();
1687 /* check for conditions that should be handled immediately */
1689 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1690 scsw_cstat(&irb->scsw) == 0)) {
1692 memcpy(&cqr->irb, irb, sizeof(*irb));
1693 device = dasd_device_from_cdev_locked(cdev);
1696 /* ignore unsolicited interrupts for DIAG discipline */
1697 if (device->discipline == dasd_diag_discipline_pointer) {
1698 dasd_put_device(device);
1703 * In some cases 'File Protected' or 'No Record Found' errors
1704 * might be expected and debug log messages for the
1705 * corresponding interrupts shouldn't be written then.
1706 * Check if either of the according suppress bits is set.
1708 sense = dasd_get_sense(irb);
1710 fp_suppressed = (sense[1] & SNS1_FILE_PROTECTED) &&
1711 test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
1712 nrf_suppressed = (sense[1] & SNS1_NO_REC_FOUND) &&
1713 test_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
1715 if (!(fp_suppressed || nrf_suppressed))
1716 device->discipline->dump_sense_dbf(device, irb, "int");
1718 if (device->features & DASD_FEATURE_ERPLOG)
1719 device->discipline->dump_sense(device, cqr, irb);
1720 device->discipline->check_for_device_change(device, cqr, irb);
1721 dasd_put_device(device);
1724 /* check for for attention message */
1725 if (scsw_dstat(&irb->scsw) & DEV_STAT_ATTENTION) {
1726 device = dasd_device_from_cdev_locked(cdev);
1727 if (!IS_ERR(device)) {
1728 device->discipline->check_attention(device,
1729 irb->esw.esw1.lpum);
1730 dasd_put_device(device);
1737 device = (struct dasd_device *) cqr->startdev;
1739 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
1740 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1741 "invalid device in request");
1745 /* Check for clear pending */
1746 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
1747 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
1748 cqr->status = DASD_CQR_CLEARED;
1749 dasd_device_clear_timer(device);
1750 wake_up(&dasd_flush_wq);
1751 dasd_schedule_device_bh(device);
1755 /* check status - the request might have been killed by dyn detach */
1756 if (cqr->status != DASD_CQR_IN_IO) {
1757 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1758 "status %02x", dev_name(&cdev->dev), cqr->status);
1764 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1765 scsw_cstat(&irb->scsw) == 0) {
1766 /* request was completed successfully */
1767 cqr->status = DASD_CQR_SUCCESS;
1769 /* Start first request on queue if possible -> fast_io. */
1770 if (cqr->devlist.next != &device->ccw_queue) {
1771 next = list_entry(cqr->devlist.next,
1772 struct dasd_ccw_req, devlist);
1774 } else { /* error */
1775 /* check for HPF error
1776 * call discipline function to requeue all requests
1777 * and disable HPF accordingly
1779 if (cqr->cpmode && dasd_check_hpf_error(irb) &&
1780 device->discipline->handle_hpf_error)
1781 device->discipline->handle_hpf_error(device, irb);
1783 * If we don't want complex ERP for this request, then just
1784 * reset this and retry it in the fastpath
1786 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
1788 if (cqr->lpm == dasd_path_get_opm(device))
1789 DBF_DEV_EVENT(DBF_DEBUG, device,
1790 "default ERP in fastpath "
1791 "(%i retries left)",
1793 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
1794 cqr->lpm = dasd_path_get_opm(device);
1795 cqr->status = DASD_CQR_QUEUED;
1798 cqr->status = DASD_CQR_ERROR;
1800 if (next && (next->status == DASD_CQR_QUEUED) &&
1801 (!device->stopped)) {
1802 if (device->discipline->start_IO(next) == 0)
1803 expires = next->expires;
1806 dasd_device_set_timer(device, expires);
1808 dasd_device_clear_timer(device);
1809 dasd_schedule_device_bh(device);
1811 EXPORT_SYMBOL(dasd_int_handler);
1813 enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
1815 struct dasd_device *device;
1817 device = dasd_device_from_cdev_locked(cdev);
1821 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1822 device->state != device->target ||
1823 !device->discipline->check_for_device_change){
1824 dasd_put_device(device);
1827 if (device->discipline->dump_sense_dbf)
1828 device->discipline->dump_sense_dbf(device, irb, "uc");
1829 device->discipline->check_for_device_change(device, NULL, irb);
1830 dasd_put_device(device);
1832 return UC_TODO_RETRY;
1834 EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
1837 * If we have an error on a dasd_block layer request then we cancel
1838 * and return all further requests from the same dasd_block as well.
1840 static void __dasd_device_recovery(struct dasd_device *device,
1841 struct dasd_ccw_req *ref_cqr)
1843 struct list_head *l, *n;
1844 struct dasd_ccw_req *cqr;
1847 * only requeue request that came from the dasd_block layer
1849 if (!ref_cqr->block)
1852 list_for_each_safe(l, n, &device->ccw_queue) {
1853 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1854 if (cqr->status == DASD_CQR_QUEUED &&
1855 ref_cqr->block == cqr->block) {
1856 cqr->status = DASD_CQR_CLEARED;
1862 * Remove those ccw requests from the queue that need to be returned
1863 * to the upper layer.
1865 static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1866 struct list_head *final_queue)
1868 struct list_head *l, *n;
1869 struct dasd_ccw_req *cqr;
1871 /* Process request with final status. */
1872 list_for_each_safe(l, n, &device->ccw_queue) {
1873 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1875 /* Skip any non-final request. */
1876 if (cqr->status == DASD_CQR_QUEUED ||
1877 cqr->status == DASD_CQR_IN_IO ||
1878 cqr->status == DASD_CQR_CLEAR_PENDING)
1880 if (cqr->status == DASD_CQR_ERROR) {
1881 __dasd_device_recovery(device, cqr);
1883 /* Rechain finished requests to final queue */
1884 list_move_tail(&cqr->devlist, final_queue);
1889 * the cqrs from the final queue are returned to the upper layer
1890 * by setting a dasd_block state and calling the callback function
1892 static void __dasd_device_process_final_queue(struct dasd_device *device,
1893 struct list_head *final_queue)
1895 struct list_head *l, *n;
1896 struct dasd_ccw_req *cqr;
1897 struct dasd_block *block;
1898 void (*callback)(struct dasd_ccw_req *, void *data);
1899 void *callback_data;
1900 char errorstring[ERRORLENGTH];
1902 list_for_each_safe(l, n, final_queue) {
1903 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1904 list_del_init(&cqr->devlist);
1906 callback = cqr->callback;
1907 callback_data = cqr->callback_data;
1909 spin_lock_bh(&block->queue_lock);
1910 switch (cqr->status) {
1911 case DASD_CQR_SUCCESS:
1912 cqr->status = DASD_CQR_DONE;
1914 case DASD_CQR_ERROR:
1915 cqr->status = DASD_CQR_NEED_ERP;
1917 case DASD_CQR_CLEARED:
1918 cqr->status = DASD_CQR_TERMINATED;
1921 /* internal error 12 - wrong cqr status*/
1922 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1923 dev_err(&device->cdev->dev,
1924 "An error occurred in the DASD device driver, "
1925 "reason=%s\n", errorstring);
1928 if (cqr->callback != NULL)
1929 (callback)(cqr, callback_data);
1931 spin_unlock_bh(&block->queue_lock);
1936 * Take a look at the first request on the ccw queue and check
1937 * if it reached its expire time. If so, terminate the IO.
1939 static void __dasd_device_check_expire(struct dasd_device *device)
1941 struct dasd_ccw_req *cqr;
1943 if (list_empty(&device->ccw_queue))
1945 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1946 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1947 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
1948 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
1950 * IO in safe offline processing should not
1951 * run out of retries
1955 if (device->discipline->term_IO(cqr) != 0) {
1956 /* Hmpf, try again in 5 sec */
1957 dev_err(&device->cdev->dev,
1958 "cqr %p timed out (%lus) but cannot be "
1959 "ended, retrying in 5 s\n",
1960 cqr, (cqr->expires/HZ));
1961 cqr->expires += 5*HZ;
1962 dasd_device_set_timer(device, 5*HZ);
1964 dev_err(&device->cdev->dev,
1965 "cqr %p timed out (%lus), %i retries "
1966 "remaining\n", cqr, (cqr->expires/HZ),
1973 * return 1 when device is not eligible for IO
1975 static int __dasd_device_is_unusable(struct dasd_device *device,
1976 struct dasd_ccw_req *cqr)
1978 int mask = ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM);
1980 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
1981 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
1983 * dasd is being set offline
1984 * but it is no safe offline where we have to allow I/O
1988 if (device->stopped) {
1989 if (device->stopped & mask) {
1990 /* stopped and CQR will not change that. */
1993 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1994 /* CQR is not able to change device to
1998 /* CQR required to get device operational. */
2004 * Take a look at the first request on the ccw queue and check
2005 * if it needs to be started.
2007 static void __dasd_device_start_head(struct dasd_device *device)
2009 struct dasd_ccw_req *cqr;
2012 if (list_empty(&device->ccw_queue))
2014 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
2015 if (cqr->status != DASD_CQR_QUEUED)
2017 /* if device is not usable return request to upper layer */
2018 if (__dasd_device_is_unusable(device, cqr)) {
2019 cqr->intrc = -EAGAIN;
2020 cqr->status = DASD_CQR_CLEARED;
2021 dasd_schedule_device_bh(device);
2025 rc = device->discipline->start_IO(cqr);
2027 dasd_device_set_timer(device, cqr->expires);
2028 else if (rc == -EACCES) {
2029 dasd_schedule_device_bh(device);
2031 /* Hmpf, try again in 1/2 sec */
2032 dasd_device_set_timer(device, 50);
2035 static void __dasd_device_check_path_events(struct dasd_device *device)
2039 if (!dasd_path_get_tbvpm(device))
2042 if (device->stopped &
2043 ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
2045 rc = device->discipline->verify_path(device,
2046 dasd_path_get_tbvpm(device));
2048 dasd_device_set_timer(device, 50);
2050 dasd_path_clear_all_verify(device);
2054 * Go through all request on the dasd_device request queue,
2055 * terminate them on the cdev if necessary, and return them to the
2056 * submitting layer via callback.
2058 * Make sure that all 'submitting layers' still exist when
2059 * this function is called!. In other words, when 'device' is a base
2060 * device then all block layer requests must have been removed before
2061 * via dasd_flush_block_queue.
2063 int dasd_flush_device_queue(struct dasd_device *device)
2065 struct dasd_ccw_req *cqr, *n;
2067 struct list_head flush_queue;
2069 INIT_LIST_HEAD(&flush_queue);
2070 spin_lock_irq(get_ccwdev_lock(device->cdev));
2072 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
2073 /* Check status and move request to flush_queue */
2074 switch (cqr->status) {
2075 case DASD_CQR_IN_IO:
2076 rc = device->discipline->term_IO(cqr);
2078 /* unable to terminate requeust */
2079 dev_err(&device->cdev->dev,
2080 "Flushing the DASD request queue "
2081 "failed for request %p\n", cqr);
2082 /* stop flush processing */
2086 case DASD_CQR_QUEUED:
2087 cqr->stopclk = get_tod_clock();
2088 cqr->status = DASD_CQR_CLEARED;
2090 default: /* no need to modify the others */
2093 list_move_tail(&cqr->devlist, &flush_queue);
2096 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2098 * After this point all requests must be in state CLEAR_PENDING,
2099 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
2100 * one of the others.
2102 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
2103 wait_event(dasd_flush_wq,
2104 (cqr->status != DASD_CQR_CLEAR_PENDING));
2106 * Now set each request back to TERMINATED, DONE or NEED_ERP
2107 * and call the callback function of flushed requests
2109 __dasd_device_process_final_queue(device, &flush_queue);
2112 EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
2115 * Acquire the device lock and process queues for the device.
2117 static void dasd_device_tasklet(struct dasd_device *device)
2119 struct list_head final_queue;
2121 atomic_set (&device->tasklet_scheduled, 0);
2122 INIT_LIST_HEAD(&final_queue);
2123 spin_lock_irq(get_ccwdev_lock(device->cdev));
2124 /* Check expire time of first request on the ccw queue. */
2125 __dasd_device_check_expire(device);
2126 /* find final requests on ccw queue */
2127 __dasd_device_process_ccw_queue(device, &final_queue);
2128 __dasd_device_check_path_events(device);
2129 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2130 /* Now call the callback function of requests with final status */
2131 __dasd_device_process_final_queue(device, &final_queue);
2132 spin_lock_irq(get_ccwdev_lock(device->cdev));
2133 /* Now check if the head of the ccw queue needs to be started. */
2134 __dasd_device_start_head(device);
2135 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2136 if (waitqueue_active(&shutdown_waitq))
2137 wake_up(&shutdown_waitq);
2138 dasd_put_device(device);
2142 * Schedules a call to dasd_tasklet over the device tasklet.
2144 void dasd_schedule_device_bh(struct dasd_device *device)
2146 /* Protect against rescheduling. */
2147 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
2149 dasd_get_device(device);
2150 tasklet_hi_schedule(&device->tasklet);
2152 EXPORT_SYMBOL(dasd_schedule_device_bh);
2154 void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
2156 device->stopped |= bits;
2158 EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
2160 void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
2162 device->stopped &= ~bits;
2163 if (!device->stopped)
2164 wake_up(&generic_waitq);
2166 EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
2169 * Queue a request to the head of the device ccw_queue.
2170 * Start the I/O if possible.
2172 void dasd_add_request_head(struct dasd_ccw_req *cqr)
2174 struct dasd_device *device;
2175 unsigned long flags;
2177 device = cqr->startdev;
2178 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2179 cqr->status = DASD_CQR_QUEUED;
2180 list_add(&cqr->devlist, &device->ccw_queue);
2181 /* let the bh start the request to keep them in order */
2182 dasd_schedule_device_bh(device);
2183 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2185 EXPORT_SYMBOL(dasd_add_request_head);
2188 * Queue a request to the tail of the device ccw_queue.
2189 * Start the I/O if possible.
2191 void dasd_add_request_tail(struct dasd_ccw_req *cqr)
2193 struct dasd_device *device;
2194 unsigned long flags;
2196 device = cqr->startdev;
2197 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2198 cqr->status = DASD_CQR_QUEUED;
2199 list_add_tail(&cqr->devlist, &device->ccw_queue);
2200 /* let the bh start the request to keep them in order */
2201 dasd_schedule_device_bh(device);
2202 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2204 EXPORT_SYMBOL(dasd_add_request_tail);
2207 * Wakeup helper for the 'sleep_on' functions.
2209 void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
2211 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2212 cqr->callback_data = DASD_SLEEPON_END_TAG;
2213 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2214 wake_up(&generic_waitq);
2216 EXPORT_SYMBOL_GPL(dasd_wakeup_cb);
2218 static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
2220 struct dasd_device *device;
2223 device = cqr->startdev;
2224 spin_lock_irq(get_ccwdev_lock(device->cdev));
2225 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
2226 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2231 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
2233 static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
2235 struct dasd_device *device;
2236 dasd_erp_fn_t erp_fn;
2238 if (cqr->status == DASD_CQR_FILLED)
2240 device = cqr->startdev;
2241 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2242 if (cqr->status == DASD_CQR_TERMINATED) {
2243 device->discipline->handle_terminated_request(cqr);
2246 if (cqr->status == DASD_CQR_NEED_ERP) {
2247 erp_fn = device->discipline->erp_action(cqr);
2251 if (cqr->status == DASD_CQR_FAILED)
2252 dasd_log_sense(cqr, &cqr->irb);
2254 __dasd_process_erp(device, cqr);
2261 static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
2263 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2264 if (cqr->refers) /* erp is not done yet */
2266 return ((cqr->status != DASD_CQR_DONE) &&
2267 (cqr->status != DASD_CQR_FAILED));
2269 return (cqr->status == DASD_CQR_FILLED);
2272 static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
2274 struct dasd_device *device;
2276 struct list_head ccw_queue;
2277 struct dasd_ccw_req *cqr;
2279 INIT_LIST_HEAD(&ccw_queue);
2280 maincqr->status = DASD_CQR_FILLED;
2281 device = maincqr->startdev;
2282 list_add(&maincqr->blocklist, &ccw_queue);
2283 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
2284 cqr = list_first_entry(&ccw_queue,
2285 struct dasd_ccw_req, blocklist)) {
2287 if (__dasd_sleep_on_erp(cqr))
2289 if (cqr->status != DASD_CQR_FILLED) /* could be failed */
2291 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2292 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2293 cqr->status = DASD_CQR_FAILED;
2294 cqr->intrc = -EPERM;
2297 /* Non-temporary stop condition will trigger fail fast */
2298 if (device->stopped & ~DASD_STOPPED_PENDING &&
2299 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2300 (!dasd_eer_enabled(device))) {
2301 cqr->status = DASD_CQR_FAILED;
2302 cqr->intrc = -ENOLINK;
2306 * Don't try to start requests if device is in
2307 * offline processing, it might wait forever
2309 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
2310 cqr->status = DASD_CQR_FAILED;
2311 cqr->intrc = -ENODEV;
2315 * Don't try to start requests if device is stopped
2316 * except path verification requests
2318 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
2319 if (interruptible) {
2320 rc = wait_event_interruptible(
2321 generic_waitq, !(device->stopped));
2322 if (rc == -ERESTARTSYS) {
2323 cqr->status = DASD_CQR_FAILED;
2324 maincqr->intrc = rc;
2328 wait_event(generic_waitq, !(device->stopped));
2331 cqr->callback = dasd_wakeup_cb;
2333 cqr->callback_data = DASD_SLEEPON_START_TAG;
2334 dasd_add_request_tail(cqr);
2335 if (interruptible) {
2336 rc = wait_event_interruptible(
2337 generic_waitq, _wait_for_wakeup(cqr));
2338 if (rc == -ERESTARTSYS) {
2339 dasd_cancel_req(cqr);
2340 /* wait (non-interruptible) for final status */
2341 wait_event(generic_waitq,
2342 _wait_for_wakeup(cqr));
2343 cqr->status = DASD_CQR_FAILED;
2344 maincqr->intrc = rc;
2348 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2351 maincqr->endclk = get_tod_clock();
2352 if ((maincqr->status != DASD_CQR_DONE) &&
2353 (maincqr->intrc != -ERESTARTSYS))
2354 dasd_log_sense(maincqr, &maincqr->irb);
2355 if (maincqr->status == DASD_CQR_DONE)
2357 else if (maincqr->intrc)
2358 rc = maincqr->intrc;
2364 static inline int _wait_for_wakeup_queue(struct list_head *ccw_queue)
2366 struct dasd_ccw_req *cqr;
2368 list_for_each_entry(cqr, ccw_queue, blocklist) {
2369 if (cqr->callback_data != DASD_SLEEPON_END_TAG)
2376 static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible)
2378 struct dasd_device *device;
2379 struct dasd_ccw_req *cqr, *n;
2384 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2385 device = cqr->startdev;
2386 if (cqr->status != DASD_CQR_FILLED) /*could be failed*/
2389 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2390 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2391 cqr->status = DASD_CQR_FAILED;
2392 cqr->intrc = -EPERM;
2395 /*Non-temporary stop condition will trigger fail fast*/
2396 if (device->stopped & ~DASD_STOPPED_PENDING &&
2397 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2398 !dasd_eer_enabled(device)) {
2399 cqr->status = DASD_CQR_FAILED;
2400 cqr->intrc = -EAGAIN;
2404 /*Don't try to start requests if device is stopped*/
2405 if (interruptible) {
2406 rc = wait_event_interruptible(
2407 generic_waitq, !device->stopped);
2408 if (rc == -ERESTARTSYS) {
2409 cqr->status = DASD_CQR_FAILED;
2414 wait_event(generic_waitq, !(device->stopped));
2417 cqr->callback = dasd_wakeup_cb;
2418 cqr->callback_data = DASD_SLEEPON_START_TAG;
2419 dasd_add_request_tail(cqr);
2422 wait_event(generic_waitq, _wait_for_wakeup_queue(ccw_queue));
2425 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2427 * In some cases the 'File Protected' or 'Incorrect Length'
2428 * error might be expected and error recovery would be
2429 * unnecessary in these cases. Check if the according suppress
2432 sense = dasd_get_sense(&cqr->irb);
2433 if (sense && sense[1] & SNS1_FILE_PROTECTED &&
2434 test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags))
2436 if (scsw_cstat(&cqr->irb.scsw) == 0x40 &&
2437 test_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags))
2441 * for alias devices simplify error recovery and
2442 * return to upper layer
2443 * do not skip ERP requests
2445 if (cqr->startdev != cqr->basedev && !cqr->refers &&
2446 (cqr->status == DASD_CQR_TERMINATED ||
2447 cqr->status == DASD_CQR_NEED_ERP))
2450 /* normal recovery for basedev IO */
2451 if (__dasd_sleep_on_erp(cqr))
2452 /* handle erp first */
2460 * Queue a request to the tail of the device ccw_queue and wait for
2463 int dasd_sleep_on(struct dasd_ccw_req *cqr)
2465 return _dasd_sleep_on(cqr, 0);
2467 EXPORT_SYMBOL(dasd_sleep_on);
2470 * Start requests from a ccw_queue and wait for their completion.
2472 int dasd_sleep_on_queue(struct list_head *ccw_queue)
2474 return _dasd_sleep_on_queue(ccw_queue, 0);
2476 EXPORT_SYMBOL(dasd_sleep_on_queue);
2479 * Queue a request to the tail of the device ccw_queue and wait
2480 * interruptible for it's completion.
2482 int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
2484 return _dasd_sleep_on(cqr, 1);
2486 EXPORT_SYMBOL(dasd_sleep_on_interruptible);
2489 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
2490 * for eckd devices) the currently running request has to be terminated
2491 * and be put back to status queued, before the special request is added
2492 * to the head of the queue. Then the special request is waited on normally.
2494 static inline int _dasd_term_running_cqr(struct dasd_device *device)
2496 struct dasd_ccw_req *cqr;
2499 if (list_empty(&device->ccw_queue))
2501 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
2502 rc = device->discipline->term_IO(cqr);
2505 * CQR terminated because a more important request is pending.
2506 * Undo decreasing of retry counter because this is
2507 * not an error case.
2513 int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
2515 struct dasd_device *device;
2518 device = cqr->startdev;
2519 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2520 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2521 cqr->status = DASD_CQR_FAILED;
2522 cqr->intrc = -EPERM;
2525 spin_lock_irq(get_ccwdev_lock(device->cdev));
2526 rc = _dasd_term_running_cqr(device);
2528 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2531 cqr->callback = dasd_wakeup_cb;
2532 cqr->callback_data = DASD_SLEEPON_START_TAG;
2533 cqr->status = DASD_CQR_QUEUED;
2535 * add new request as second
2536 * first the terminated cqr needs to be finished
2538 list_add(&cqr->devlist, device->ccw_queue.next);
2540 /* let the bh start the request to keep them in order */
2541 dasd_schedule_device_bh(device);
2543 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2545 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2547 if (cqr->status == DASD_CQR_DONE)
2549 else if (cqr->intrc)
2555 dasd_schedule_device_bh(device);
2557 dasd_schedule_block_bh(device->block);
2561 EXPORT_SYMBOL(dasd_sleep_on_immediatly);
2564 * Cancels a request that was started with dasd_sleep_on_req.
2565 * This is useful to timeout requests. The request will be
2566 * terminated if it is currently in i/o.
2567 * Returns 0 if request termination was successful
2568 * negative error code if termination failed
2569 * Cancellation of a request is an asynchronous operation! The calling
2570 * function has to wait until the request is properly returned via callback.
2572 int dasd_cancel_req(struct dasd_ccw_req *cqr)
2574 struct dasd_device *device = cqr->startdev;
2575 unsigned long flags;
2579 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2580 switch (cqr->status) {
2581 case DASD_CQR_QUEUED:
2582 /* request was not started - just set to cleared */
2583 cqr->status = DASD_CQR_CLEARED;
2584 if (cqr->callback_data == DASD_SLEEPON_START_TAG)
2585 cqr->callback_data = DASD_SLEEPON_END_TAG;
2587 case DASD_CQR_IN_IO:
2588 /* request in IO - terminate IO and release again */
2589 rc = device->discipline->term_IO(cqr);
2591 dev_err(&device->cdev->dev,
2592 "Cancelling request %p failed with rc=%d\n",
2595 cqr->stopclk = get_tod_clock();
2598 default: /* already finished or clear pending - do nothing */
2601 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2602 dasd_schedule_device_bh(device);
2605 EXPORT_SYMBOL(dasd_cancel_req);
2608 * SECTION: Operations of the dasd_block layer.
2612 * Timeout function for dasd_block. This is used when the block layer
2613 * is waiting for something that may not come reliably, (e.g. a state
2616 static void dasd_block_timeout(struct timer_list *t)
2618 unsigned long flags;
2619 struct dasd_block *block;
2621 block = from_timer(block, t, timer);
2622 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
2623 /* re-activate request queue */
2624 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
2625 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
2626 dasd_schedule_block_bh(block);
2627 blk_mq_run_hw_queues(block->request_queue, true);
2631 * Setup timeout for a dasd_block in jiffies.
2633 void dasd_block_set_timer(struct dasd_block *block, int expires)
2636 del_timer(&block->timer);
2638 mod_timer(&block->timer, jiffies + expires);
2640 EXPORT_SYMBOL(dasd_block_set_timer);
2643 * Clear timeout for a dasd_block.
2645 void dasd_block_clear_timer(struct dasd_block *block)
2647 del_timer(&block->timer);
2649 EXPORT_SYMBOL(dasd_block_clear_timer);
2652 * Process finished error recovery ccw.
2654 static void __dasd_process_erp(struct dasd_device *device,
2655 struct dasd_ccw_req *cqr)
2657 dasd_erp_fn_t erp_fn;
2659 if (cqr->status == DASD_CQR_DONE)
2660 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
2662 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
2663 erp_fn = device->discipline->erp_postaction(cqr);
2667 static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
2669 struct request *req;
2670 blk_status_t error = BLK_STS_OK;
2673 req = (struct request *) cqr->callback_data;
2674 dasd_profile_end(cqr->block, cqr, req);
2676 status = cqr->block->base->discipline->free_cp(cqr, req);
2678 error = errno_to_blk_status(status);
2679 else if (status == 0) {
2680 switch (cqr->intrc) {
2682 error = BLK_STS_NEXUS;
2685 error = BLK_STS_TRANSPORT;
2688 error = BLK_STS_TIMEOUT;
2691 error = BLK_STS_IOERR;
2697 * We need to take care for ETIMEDOUT errors here since the
2698 * complete callback does not get called in this case.
2699 * Take care of all errors here and avoid additional code to
2700 * transfer the error value to the complete callback.
2703 blk_mq_end_request(req, error);
2704 blk_mq_run_hw_queues(req->q, true);
2706 blk_mq_complete_request(req);
2711 * Process ccw request queue.
2713 static void __dasd_process_block_ccw_queue(struct dasd_block *block,
2714 struct list_head *final_queue)
2716 struct list_head *l, *n;
2717 struct dasd_ccw_req *cqr;
2718 dasd_erp_fn_t erp_fn;
2719 unsigned long flags;
2720 struct dasd_device *base = block->base;
2723 /* Process request with final status. */
2724 list_for_each_safe(l, n, &block->ccw_queue) {
2725 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2726 if (cqr->status != DASD_CQR_DONE &&
2727 cqr->status != DASD_CQR_FAILED &&
2728 cqr->status != DASD_CQR_NEED_ERP &&
2729 cqr->status != DASD_CQR_TERMINATED)
2732 if (cqr->status == DASD_CQR_TERMINATED) {
2733 base->discipline->handle_terminated_request(cqr);
2737 /* Process requests that may be recovered */
2738 if (cqr->status == DASD_CQR_NEED_ERP) {
2739 erp_fn = base->discipline->erp_action(cqr);
2740 if (IS_ERR(erp_fn(cqr)))
2745 /* log sense for fatal error */
2746 if (cqr->status == DASD_CQR_FAILED) {
2747 dasd_log_sense(cqr, &cqr->irb);
2750 /* First of all call extended error reporting. */
2751 if (dasd_eer_enabled(base) &&
2752 cqr->status == DASD_CQR_FAILED) {
2753 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
2755 /* restart request */
2756 cqr->status = DASD_CQR_FILLED;
2758 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
2759 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
2760 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
2765 /* Process finished ERP request. */
2767 __dasd_process_erp(base, cqr);
2771 /* Rechain finished requests to final queue */
2772 cqr->endclk = get_tod_clock();
2773 list_move_tail(&cqr->blocklist, final_queue);
2777 static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
2779 dasd_schedule_block_bh(cqr->block);
2782 static void __dasd_block_start_head(struct dasd_block *block)
2784 struct dasd_ccw_req *cqr;
2786 if (list_empty(&block->ccw_queue))
2788 /* We allways begin with the first requests on the queue, as some
2789 * of previously started requests have to be enqueued on a
2790 * dasd_device again for error recovery.
2792 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
2793 if (cqr->status != DASD_CQR_FILLED)
2795 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
2796 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2797 cqr->status = DASD_CQR_FAILED;
2798 cqr->intrc = -EPERM;
2799 dasd_schedule_block_bh(block);
2802 /* Non-temporary stop condition will trigger fail fast */
2803 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
2804 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2805 (!dasd_eer_enabled(block->base))) {
2806 cqr->status = DASD_CQR_FAILED;
2807 cqr->intrc = -ENOLINK;
2808 dasd_schedule_block_bh(block);
2811 /* Don't try to start requests if device is stopped */
2812 if (block->base->stopped)
2815 /* just a fail safe check, should not happen */
2817 cqr->startdev = block->base;
2819 /* make sure that the requests we submit find their way back */
2820 cqr->callback = dasd_return_cqr_cb;
2822 dasd_add_request_tail(cqr);
2827 * Central dasd_block layer routine. Takes requests from the generic
2828 * block layer request queue, creates ccw requests, enqueues them on
2829 * a dasd_device and processes ccw requests that have been returned.
2831 static void dasd_block_tasklet(struct dasd_block *block)
2833 struct list_head final_queue;
2834 struct list_head *l, *n;
2835 struct dasd_ccw_req *cqr;
2836 struct dasd_queue *dq;
2838 atomic_set(&block->tasklet_scheduled, 0);
2839 INIT_LIST_HEAD(&final_queue);
2840 spin_lock_irq(&block->queue_lock);
2841 /* Finish off requests on ccw queue */
2842 __dasd_process_block_ccw_queue(block, &final_queue);
2843 spin_unlock_irq(&block->queue_lock);
2845 /* Now call the callback function of requests with final status */
2846 list_for_each_safe(l, n, &final_queue) {
2847 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2849 spin_lock_irq(&dq->lock);
2850 list_del_init(&cqr->blocklist);
2851 __dasd_cleanup_cqr(cqr);
2852 spin_unlock_irq(&dq->lock);
2855 spin_lock_irq(&block->queue_lock);
2856 /* Now check if the head of the ccw queue needs to be started. */
2857 __dasd_block_start_head(block);
2858 spin_unlock_irq(&block->queue_lock);
2860 if (waitqueue_active(&shutdown_waitq))
2861 wake_up(&shutdown_waitq);
2862 dasd_put_device(block->base);
2865 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2867 wake_up(&dasd_flush_wq);
2871 * Requeue a request back to the block request queue
2872 * only works for block requests
2874 static int _dasd_requeue_request(struct dasd_ccw_req *cqr)
2876 struct dasd_block *block = cqr->block;
2877 struct request *req;
2881 spin_lock_irq(&cqr->dq->lock);
2882 req = (struct request *) cqr->callback_data;
2883 blk_mq_requeue_request(req, false);
2884 spin_unlock_irq(&cqr->dq->lock);
2890 * Go through all request on the dasd_block request queue, cancel them
2891 * on the respective dasd_device, and return them to the generic
2894 static int dasd_flush_block_queue(struct dasd_block *block)
2896 struct dasd_ccw_req *cqr, *n;
2898 struct list_head flush_queue;
2899 unsigned long flags;
2901 INIT_LIST_HEAD(&flush_queue);
2902 spin_lock_bh(&block->queue_lock);
2905 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2906 /* if this request currently owned by a dasd_device cancel it */
2907 if (cqr->status >= DASD_CQR_QUEUED)
2908 rc = dasd_cancel_req(cqr);
2911 /* Rechain request (including erp chain) so it won't be
2912 * touched by the dasd_block_tasklet anymore.
2913 * Replace the callback so we notice when the request
2914 * is returned from the dasd_device layer.
2916 cqr->callback = _dasd_wake_block_flush_cb;
2917 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2918 list_move_tail(&cqr->blocklist, &flush_queue);
2920 /* moved more than one request - need to restart */
2923 spin_unlock_bh(&block->queue_lock);
2924 /* Now call the callback function of flushed requests */
2926 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
2927 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
2928 /* Process finished ERP request. */
2930 spin_lock_bh(&block->queue_lock);
2931 __dasd_process_erp(block->base, cqr);
2932 spin_unlock_bh(&block->queue_lock);
2933 /* restart list_for_xx loop since dasd_process_erp
2934 * might remove multiple elements */
2937 /* call the callback function */
2938 spin_lock_irqsave(&cqr->dq->lock, flags);
2939 cqr->endclk = get_tod_clock();
2940 list_del_init(&cqr->blocklist);
2941 __dasd_cleanup_cqr(cqr);
2942 spin_unlock_irqrestore(&cqr->dq->lock, flags);
2948 * Schedules a call to dasd_tasklet over the device tasklet.
2950 void dasd_schedule_block_bh(struct dasd_block *block)
2952 /* Protect against rescheduling. */
2953 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
2955 /* life cycle of block is bound to it's base device */
2956 dasd_get_device(block->base);
2957 tasklet_hi_schedule(&block->tasklet);
2959 EXPORT_SYMBOL(dasd_schedule_block_bh);
2963 * SECTION: external block device operations
2964 * (request queue handling, open, release, etc.)
2968 * Dasd request queue function. Called from ll_rw_blk.c
2970 static blk_status_t do_dasd_request(struct blk_mq_hw_ctx *hctx,
2971 const struct blk_mq_queue_data *qd)
2973 struct dasd_block *block = hctx->queue->queuedata;
2974 struct dasd_queue *dq = hctx->driver_data;
2975 struct request *req = qd->rq;
2976 struct dasd_device *basedev;
2977 struct dasd_ccw_req *cqr;
2978 blk_status_t rc = BLK_STS_OK;
2980 basedev = block->base;
2981 spin_lock_irq(&dq->lock);
2982 if (basedev->state < DASD_STATE_READY) {
2983 DBF_DEV_EVENT(DBF_ERR, basedev,
2984 "device not ready for request %p", req);
2990 * if device is stopped do not fetch new requests
2991 * except failfast is active which will let requests fail
2992 * immediately in __dasd_block_start_head()
2994 if (basedev->stopped && !(basedev->features & DASD_FEATURE_FAILFAST)) {
2995 DBF_DEV_EVENT(DBF_ERR, basedev,
2996 "device stopped request %p", req);
2997 rc = BLK_STS_RESOURCE;
3001 if (basedev->features & DASD_FEATURE_READONLY &&
3002 rq_data_dir(req) == WRITE) {
3003 DBF_DEV_EVENT(DBF_ERR, basedev,
3004 "Rejecting write request %p", req);
3009 if (test_bit(DASD_FLAG_ABORTALL, &basedev->flags) &&
3010 (basedev->features & DASD_FEATURE_FAILFAST ||
3011 blk_noretry_request(req))) {
3012 DBF_DEV_EVENT(DBF_ERR, basedev,
3013 "Rejecting failfast request %p", req);
3018 cqr = basedev->discipline->build_cp(basedev, block, req);
3020 if (PTR_ERR(cqr) == -EBUSY ||
3021 PTR_ERR(cqr) == -ENOMEM ||
3022 PTR_ERR(cqr) == -EAGAIN) {
3023 rc = BLK_STS_RESOURCE;
3026 DBF_DEV_EVENT(DBF_ERR, basedev,
3027 "CCW creation failed (rc=%ld) on request %p",
3033 * Note: callback is set to dasd_return_cqr_cb in
3034 * __dasd_block_start_head to cover erp requests as well
3036 cqr->callback_data = req;
3037 cqr->status = DASD_CQR_FILLED;
3039 req->completion_data = cqr;
3040 blk_mq_start_request(req);
3041 spin_lock(&block->queue_lock);
3042 list_add_tail(&cqr->blocklist, &block->ccw_queue);
3043 INIT_LIST_HEAD(&cqr->devlist);
3044 dasd_profile_start(block, cqr, req);
3045 dasd_schedule_block_bh(block);
3046 spin_unlock(&block->queue_lock);
3049 spin_unlock_irq(&dq->lock);
3054 * Block timeout callback, called from the block layer
3057 * BLK_EH_RESET_TIMER if the request should be left running
3058 * BLK_EH_NOT_HANDLED if the request is handled or terminated
3061 enum blk_eh_timer_return dasd_times_out(struct request *req, bool reserved)
3063 struct dasd_ccw_req *cqr = req->completion_data;
3064 struct dasd_block *block = req->q->queuedata;
3065 struct dasd_device *device;
3066 unsigned long flags;
3070 return BLK_EH_NOT_HANDLED;
3072 spin_lock_irqsave(&cqr->dq->lock, flags);
3073 device = cqr->startdev ? cqr->startdev : block->base;
3074 if (!device->blk_timeout) {
3075 spin_unlock_irqrestore(&cqr->dq->lock, flags);
3076 return BLK_EH_RESET_TIMER;
3078 DBF_DEV_EVENT(DBF_WARNING, device,
3079 " dasd_times_out cqr %p status %x",
3082 spin_lock(&block->queue_lock);
3083 spin_lock(get_ccwdev_lock(device->cdev));
3085 cqr->intrc = -ETIMEDOUT;
3086 if (cqr->status >= DASD_CQR_QUEUED) {
3087 spin_unlock(get_ccwdev_lock(device->cdev));
3088 rc = dasd_cancel_req(cqr);
3089 } else if (cqr->status == DASD_CQR_FILLED ||
3090 cqr->status == DASD_CQR_NEED_ERP) {
3091 cqr->status = DASD_CQR_TERMINATED;
3092 spin_unlock(get_ccwdev_lock(device->cdev));
3093 } else if (cqr->status == DASD_CQR_IN_ERP) {
3094 struct dasd_ccw_req *searchcqr, *nextcqr, *tmpcqr;
3096 list_for_each_entry_safe(searchcqr, nextcqr,
3097 &block->ccw_queue, blocklist) {
3099 while (tmpcqr->refers)
3100 tmpcqr = tmpcqr->refers;
3103 /* searchcqr is an ERP request for cqr */
3104 searchcqr->retries = -1;
3105 searchcqr->intrc = -ETIMEDOUT;
3106 if (searchcqr->status >= DASD_CQR_QUEUED) {
3107 spin_unlock(get_ccwdev_lock(device->cdev));
3108 rc = dasd_cancel_req(searchcqr);
3109 spin_lock(get_ccwdev_lock(device->cdev));
3110 } else if ((searchcqr->status == DASD_CQR_FILLED) ||
3111 (searchcqr->status == DASD_CQR_NEED_ERP)) {
3112 searchcqr->status = DASD_CQR_TERMINATED;
3114 } else if (searchcqr->status == DASD_CQR_IN_ERP) {
3116 * Shouldn't happen; most recent ERP
3117 * request is at the front of queue
3123 spin_unlock(get_ccwdev_lock(device->cdev));
3125 dasd_schedule_block_bh(block);
3126 spin_unlock(&block->queue_lock);
3127 spin_unlock_irqrestore(&cqr->dq->lock, flags);
3129 return rc ? BLK_EH_RESET_TIMER : BLK_EH_NOT_HANDLED;
3132 static int dasd_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
3135 struct dasd_queue *dq = kzalloc(sizeof(*dq), GFP_KERNEL);
3140 spin_lock_init(&dq->lock);
3141 hctx->driver_data = dq;
3146 static void dasd_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int idx)
3148 kfree(hctx->driver_data);
3149 hctx->driver_data = NULL;
3152 static void dasd_request_done(struct request *req)
3154 blk_mq_end_request(req, 0);
3155 blk_mq_run_hw_queues(req->q, true);
3158 static struct blk_mq_ops dasd_mq_ops = {
3159 .queue_rq = do_dasd_request,
3160 .complete = dasd_request_done,
3161 .timeout = dasd_times_out,
3162 .init_hctx = dasd_init_hctx,
3163 .exit_hctx = dasd_exit_hctx,
3167 * Allocate and initialize request queue and default I/O scheduler.
3169 static int dasd_alloc_queue(struct dasd_block *block)
3173 block->tag_set.ops = &dasd_mq_ops;
3174 block->tag_set.nr_hw_queues = DASD_NR_HW_QUEUES;
3175 block->tag_set.queue_depth = DASD_MAX_LCU_DEV * DASD_REQ_PER_DEV;
3176 block->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
3178 rc = blk_mq_alloc_tag_set(&block->tag_set);
3182 block->request_queue = blk_mq_init_queue(&block->tag_set);
3183 if (IS_ERR(block->request_queue))
3184 return PTR_ERR(block->request_queue);
3186 block->request_queue->queuedata = block;
3192 * Allocate and initialize request queue.
3194 static void dasd_setup_queue(struct dasd_block *block)
3196 unsigned int logical_block_size = block->bp_block;
3197 struct request_queue *q = block->request_queue;
3198 unsigned int max_bytes, max_discard_sectors;
3201 if (block->base->features & DASD_FEATURE_USERAW) {
3203 * the max_blocks value for raw_track access is 256
3204 * it is higher than the native ECKD value because we
3205 * only need one ccw per track
3206 * so the max_hw_sectors are
3207 * 2048 x 512B = 1024kB = 16 tracks
3211 max = block->base->discipline->max_blocks << block->s2b_shift;
3213 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
3214 q->limits.max_dev_sectors = max;
3215 blk_queue_logical_block_size(q, logical_block_size);
3216 blk_queue_max_hw_sectors(q, max);
3217 blk_queue_max_segments(q, USHRT_MAX);
3218 /* with page sized segments we can translate each segement into
3221 blk_queue_max_segment_size(q, PAGE_SIZE);
3222 blk_queue_segment_boundary(q, PAGE_SIZE - 1);
3224 /* Only activate blocklayer discard support for devices that support it */
3225 if (block->base->features & DASD_FEATURE_DISCARD) {
3226 q->limits.discard_granularity = logical_block_size;
3227 q->limits.discard_alignment = PAGE_SIZE;
3229 /* Calculate max_discard_sectors and make it PAGE aligned */
3230 max_bytes = USHRT_MAX * logical_block_size;
3231 max_bytes = ALIGN(max_bytes, PAGE_SIZE) - PAGE_SIZE;
3232 max_discard_sectors = max_bytes / logical_block_size;
3234 blk_queue_max_discard_sectors(q, max_discard_sectors);
3235 blk_queue_max_write_zeroes_sectors(q, max_discard_sectors);
3236 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
3241 * Deactivate and free request queue.
3243 static void dasd_free_queue(struct dasd_block *block)
3245 if (block->request_queue) {
3246 blk_cleanup_queue(block->request_queue);
3247 blk_mq_free_tag_set(&block->tag_set);
3248 block->request_queue = NULL;
3252 static int dasd_open(struct block_device *bdev, fmode_t mode)
3254 struct dasd_device *base;
3257 base = dasd_device_from_gendisk(bdev->bd_disk);
3261 atomic_inc(&base->block->open_count);
3262 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
3267 if (!try_module_get(base->discipline->owner)) {
3272 if (dasd_probeonly) {
3273 dev_info(&base->cdev->dev,
3274 "Accessing the DASD failed because it is in "
3275 "probeonly mode\n");
3280 if (base->state <= DASD_STATE_BASIC) {
3281 DBF_DEV_EVENT(DBF_ERR, base, " %s",
3282 " Cannot open unrecognized device");
3287 if ((mode & FMODE_WRITE) &&
3288 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
3289 (base->features & DASD_FEATURE_READONLY))) {
3294 dasd_put_device(base);
3298 module_put(base->discipline->owner);
3300 atomic_dec(&base->block->open_count);
3301 dasd_put_device(base);
3305 static void dasd_release(struct gendisk *disk, fmode_t mode)
3307 struct dasd_device *base = dasd_device_from_gendisk(disk);
3309 atomic_dec(&base->block->open_count);
3310 module_put(base->discipline->owner);
3311 dasd_put_device(base);
3316 * Return disk geometry.
3318 static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3320 struct dasd_device *base;
3322 base = dasd_device_from_gendisk(bdev->bd_disk);
3326 if (!base->discipline ||
3327 !base->discipline->fill_geometry) {
3328 dasd_put_device(base);
3331 base->discipline->fill_geometry(base->block, geo);
3332 geo->start = get_start_sect(bdev) >> base->block->s2b_shift;
3333 dasd_put_device(base);
3337 const struct block_device_operations
3338 dasd_device_operations = {
3339 .owner = THIS_MODULE,
3341 .release = dasd_release,
3342 .ioctl = dasd_ioctl,
3343 .compat_ioctl = dasd_ioctl,
3344 .getgeo = dasd_getgeo,
3347 /*******************************************************************************
3348 * end of block device operations
3354 #ifdef CONFIG_PROC_FS
3358 if (dasd_page_cache != NULL) {
3359 kmem_cache_destroy(dasd_page_cache);
3360 dasd_page_cache = NULL;
3362 dasd_gendisk_exit();
3364 if (dasd_debug_area != NULL) {
3365 debug_unregister(dasd_debug_area);
3366 dasd_debug_area = NULL;
3368 dasd_statistics_removeroot();
3372 * SECTION: common functions for ccw_driver use
3376 * Is the device read-only?
3377 * Note that this function does not report the setting of the
3378 * readonly device attribute, but how it is configured in z/VM.
3380 int dasd_device_is_ro(struct dasd_device *device)
3382 struct ccw_dev_id dev_id;
3383 struct diag210 diag_data;
3388 ccw_device_get_id(device->cdev, &dev_id);
3389 memset(&diag_data, 0, sizeof(diag_data));
3390 diag_data.vrdcdvno = dev_id.devno;
3391 diag_data.vrdclen = sizeof(diag_data);
3392 rc = diag210(&diag_data);
3393 if (rc == 0 || rc == 2) {
3394 return diag_data.vrdcvfla & 0x80;
3396 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
3401 EXPORT_SYMBOL_GPL(dasd_device_is_ro);
3403 static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
3405 struct ccw_device *cdev = data;
3408 ret = ccw_device_set_online(cdev);
3410 pr_warn("%s: Setting the DASD online failed with rc=%d\n",
3411 dev_name(&cdev->dev), ret);
3415 * Initial attempt at a probe function. this can be simplified once
3416 * the other detection code is gone.
3418 int dasd_generic_probe(struct ccw_device *cdev,
3419 struct dasd_discipline *discipline)
3423 ret = dasd_add_sysfs_files(cdev);
3425 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
3426 "dasd_generic_probe: could not add "
3430 cdev->handler = &dasd_int_handler;
3433 * Automatically online either all dasd devices (dasd_autodetect)
3434 * or all devices specified with dasd= parameters during
3437 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
3438 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
3439 async_schedule(dasd_generic_auto_online, cdev);
3442 EXPORT_SYMBOL_GPL(dasd_generic_probe);
3444 void dasd_generic_free_discipline(struct dasd_device *device)
3446 /* Forget the discipline information. */
3447 if (device->discipline) {
3448 if (device->discipline->uncheck_device)
3449 device->discipline->uncheck_device(device);
3450 module_put(device->discipline->owner);
3451 device->discipline = NULL;
3453 if (device->base_discipline) {
3454 module_put(device->base_discipline->owner);
3455 device->base_discipline = NULL;
3458 EXPORT_SYMBOL_GPL(dasd_generic_free_discipline);
3461 * This will one day be called from a global not_oper handler.
3462 * It is also used by driver_unregister during module unload.
3464 void dasd_generic_remove(struct ccw_device *cdev)
3466 struct dasd_device *device;
3467 struct dasd_block *block;
3469 cdev->handler = NULL;
3471 device = dasd_device_from_cdev(cdev);
3472 if (IS_ERR(device)) {
3473 dasd_remove_sysfs_files(cdev);
3476 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3477 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3478 /* Already doing offline processing */
3479 dasd_put_device(device);
3480 dasd_remove_sysfs_files(cdev);
3484 * This device is removed unconditionally. Set offline
3485 * flag to prevent dasd_open from opening it while it is
3486 * no quite down yet.
3488 dasd_set_target_state(device, DASD_STATE_NEW);
3489 /* dasd_delete_device destroys the device reference. */
3490 block = device->block;
3491 dasd_delete_device(device);
3493 * life cycle of block is bound to device, so delete it after
3494 * device was safely removed
3497 dasd_free_block(block);
3499 dasd_remove_sysfs_files(cdev);
3501 EXPORT_SYMBOL_GPL(dasd_generic_remove);
3504 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
3505 * the device is detected for the first time and is supposed to be used
3506 * or the user has started activation through sysfs.
3508 int dasd_generic_set_online(struct ccw_device *cdev,
3509 struct dasd_discipline *base_discipline)
3511 struct dasd_discipline *discipline;
3512 struct dasd_device *device;
3515 /* first online clears initial online feature flag */
3516 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
3517 device = dasd_create_device(cdev);
3519 return PTR_ERR(device);
3521 discipline = base_discipline;
3522 if (device->features & DASD_FEATURE_USEDIAG) {
3523 if (!dasd_diag_discipline_pointer) {
3524 /* Try to load the required module. */
3525 rc = request_module(DASD_DIAG_MOD);
3527 pr_warn("%s Setting the DASD online failed "
3528 "because the required module %s "
3529 "could not be loaded (rc=%d)\n",
3530 dev_name(&cdev->dev), DASD_DIAG_MOD,
3532 dasd_delete_device(device);
3536 /* Module init could have failed, so check again here after
3537 * request_module(). */
3538 if (!dasd_diag_discipline_pointer) {
3539 pr_warn("%s Setting the DASD online failed because of missing DIAG discipline\n",
3540 dev_name(&cdev->dev));
3541 dasd_delete_device(device);
3544 discipline = dasd_diag_discipline_pointer;
3546 if (!try_module_get(base_discipline->owner)) {
3547 dasd_delete_device(device);
3550 if (!try_module_get(discipline->owner)) {
3551 module_put(base_discipline->owner);
3552 dasd_delete_device(device);
3555 device->base_discipline = base_discipline;
3556 device->discipline = discipline;
3558 /* check_device will allocate block device if necessary */
3559 rc = discipline->check_device(device);
3561 pr_warn("%s Setting the DASD online with discipline %s failed with rc=%i\n",
3562 dev_name(&cdev->dev), discipline->name, rc);
3563 module_put(discipline->owner);
3564 module_put(base_discipline->owner);
3565 dasd_delete_device(device);
3569 dasd_set_target_state(device, DASD_STATE_ONLINE);
3570 if (device->state <= DASD_STATE_KNOWN) {
3571 pr_warn("%s Setting the DASD online failed because of a missing discipline\n",
3572 dev_name(&cdev->dev));
3574 dasd_set_target_state(device, DASD_STATE_NEW);
3576 dasd_free_block(device->block);
3577 dasd_delete_device(device);
3579 pr_debug("dasd_generic device %s found\n",
3580 dev_name(&cdev->dev));
3582 wait_event(dasd_init_waitq, _wait_for_device(device));
3584 dasd_put_device(device);
3587 EXPORT_SYMBOL_GPL(dasd_generic_set_online);
3589 int dasd_generic_set_offline(struct ccw_device *cdev)
3591 struct dasd_device *device;
3592 struct dasd_block *block;
3593 int max_count, open_count, rc;
3594 unsigned long flags;
3597 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
3598 device = dasd_device_from_cdev_locked(cdev);
3599 if (IS_ERR(device)) {
3600 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
3601 return PTR_ERR(device);
3605 * We must make sure that this device is currently not in use.
3606 * The open_count is increased for every opener, that includes
3607 * the blkdev_get in dasd_scan_partitions. We are only interested
3608 * in the other openers.
3610 if (device->block) {
3611 max_count = device->block->bdev ? 0 : -1;
3612 open_count = atomic_read(&device->block->open_count);
3613 if (open_count > max_count) {
3615 pr_warn("%s: The DASD cannot be set offline with open count %i\n",
3616 dev_name(&cdev->dev), open_count);
3618 pr_warn("%s: The DASD cannot be set offline while it is in use\n",
3619 dev_name(&cdev->dev));
3626 * Test if the offline processing is already running and exit if so.
3627 * If a safe offline is being processed this could only be a normal
3628 * offline that should be able to overtake the safe offline and
3629 * cancel any I/O we do not want to wait for any longer
3631 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3632 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3633 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING,
3640 set_bit(DASD_FLAG_OFFLINE, &device->flags);
3643 * if safe_offline is called set safe_offline_running flag and
3644 * clear safe_offline so that a call to normal offline
3645 * can overrun safe_offline processing
3647 if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags) &&
3648 !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3649 /* need to unlock here to wait for outstanding I/O */
3650 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
3652 * If we want to set the device safe offline all IO operations
3653 * should be finished before continuing the offline process
3654 * so sync bdev first and then wait for our queues to become
3657 if (device->block) {
3658 rc = fsync_bdev(device->block->bdev);
3662 dasd_schedule_device_bh(device);
3663 rc = wait_event_interruptible(shutdown_waitq,
3664 _wait_for_empty_queues(device));
3669 * check if a normal offline process overtook the offline
3670 * processing in this case simply do nothing beside returning
3671 * that we got interrupted
3672 * otherwise mark safe offline as not running any longer and
3673 * continue with normal offline
3675 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
3676 if (!test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3680 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags);
3682 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
3684 dasd_set_target_state(device, DASD_STATE_NEW);
3685 /* dasd_delete_device destroys the device reference. */
3686 block = device->block;
3687 dasd_delete_device(device);
3689 * life cycle of block is bound to device, so delete it after
3690 * device was safely removed
3693 dasd_free_block(block);
3698 /* interrupted by signal */
3699 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
3700 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags);
3701 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3703 dasd_put_device(device);
3704 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
3707 EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
3709 int dasd_generic_last_path_gone(struct dasd_device *device)
3711 struct dasd_ccw_req *cqr;
3713 dev_warn(&device->cdev->dev, "No operational channel path is left "
3714 "for the device\n");
3715 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
3716 /* First of all call extended error reporting. */
3717 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3719 if (device->state < DASD_STATE_BASIC)
3721 /* Device is active. We want to keep it. */
3722 list_for_each_entry(cqr, &device->ccw_queue, devlist)
3723 if ((cqr->status == DASD_CQR_IN_IO) ||
3724 (cqr->status == DASD_CQR_CLEAR_PENDING)) {
3725 cqr->status = DASD_CQR_QUEUED;
3728 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
3729 dasd_device_clear_timer(device);
3730 dasd_schedule_device_bh(device);
3733 EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
3735 int dasd_generic_path_operational(struct dasd_device *device)
3737 dev_info(&device->cdev->dev, "A channel path to the device has become "
3739 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
3740 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
3741 if (device->stopped & DASD_UNRESUMED_PM) {
3742 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
3743 dasd_restore_device(device);
3746 dasd_schedule_device_bh(device);
3747 if (device->block) {
3748 dasd_schedule_block_bh(device->block);
3749 if (device->block->request_queue)
3750 blk_mq_run_hw_queues(device->block->request_queue,
3754 if (!device->stopped)
3755 wake_up(&generic_waitq);
3759 EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
3761 int dasd_generic_notify(struct ccw_device *cdev, int event)
3763 struct dasd_device *device;
3766 device = dasd_device_from_cdev_locked(cdev);
3774 dasd_path_no_path(device);
3775 ret = dasd_generic_last_path_gone(device);
3779 if (dasd_path_get_opm(device))
3780 ret = dasd_generic_path_operational(device);
3783 dasd_put_device(device);
3786 EXPORT_SYMBOL_GPL(dasd_generic_notify);
3788 void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
3790 struct dasd_device *device;
3791 int chp, oldopm, hpfpm, ifccpm;
3793 device = dasd_device_from_cdev_locked(cdev);
3797 oldopm = dasd_path_get_opm(device);
3798 for (chp = 0; chp < 8; chp++) {
3799 if (path_event[chp] & PE_PATH_GONE) {
3800 dasd_path_notoper(device, chp);
3802 if (path_event[chp] & PE_PATH_AVAILABLE) {
3803 dasd_path_available(device, chp);
3804 dasd_schedule_device_bh(device);
3806 if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) {
3807 if (!dasd_path_is_operational(device, chp) &&
3808 !dasd_path_need_verify(device, chp)) {
3810 * we can not establish a pathgroup on an
3811 * unavailable path, so trigger a path
3812 * verification first
3814 dasd_path_available(device, chp);
3815 dasd_schedule_device_bh(device);
3817 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3818 "Pathgroup re-established\n");
3819 if (device->discipline->kick_validate)
3820 device->discipline->kick_validate(device);
3823 hpfpm = dasd_path_get_hpfpm(device);
3824 ifccpm = dasd_path_get_ifccpm(device);
3825 if (!dasd_path_get_opm(device) && hpfpm) {
3827 * device has no operational paths but at least one path is
3828 * disabled due to HPF errors
3829 * disable HPF at all and use the path(s) again
3831 if (device->discipline->disable_hpf)
3832 device->discipline->disable_hpf(device);
3833 dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
3834 dasd_path_set_tbvpm(device, hpfpm);
3835 dasd_schedule_device_bh(device);
3836 dasd_schedule_requeue(device);
3837 } else if (!dasd_path_get_opm(device) && ifccpm) {
3839 * device has no operational paths but at least one path is
3840 * disabled due to IFCC errors
3841 * trigger path verification on paths with IFCC errors
3843 dasd_path_set_tbvpm(device, ifccpm);
3844 dasd_schedule_device_bh(device);
3846 if (oldopm && !dasd_path_get_opm(device) && !hpfpm && !ifccpm) {
3847 dev_warn(&device->cdev->dev,
3848 "No verified channel paths remain for the device\n");
3849 DBF_DEV_EVENT(DBF_WARNING, device,
3850 "%s", "last verified path gone");
3851 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3852 dasd_device_set_stop_bits(device,
3853 DASD_STOPPED_DC_WAIT);
3855 dasd_put_device(device);
3857 EXPORT_SYMBOL_GPL(dasd_generic_path_event);
3859 int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
3861 if (!dasd_path_get_opm(device) && lpm) {
3862 dasd_path_set_opm(device, lpm);
3863 dasd_generic_path_operational(device);
3865 dasd_path_add_opm(device, lpm);
3868 EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
3871 * clear active requests and requeue them to block layer if possible
3873 static int dasd_generic_requeue_all_requests(struct dasd_device *device)
3875 struct list_head requeue_queue;
3876 struct dasd_ccw_req *cqr, *n;
3877 struct dasd_ccw_req *refers;
3880 INIT_LIST_HEAD(&requeue_queue);
3881 spin_lock_irq(get_ccwdev_lock(device->cdev));
3883 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
3884 /* Check status and move request to flush_queue */
3885 if (cqr->status == DASD_CQR_IN_IO) {
3886 rc = device->discipline->term_IO(cqr);
3888 /* unable to terminate requeust */
3889 dev_err(&device->cdev->dev,
3890 "Unable to terminate request %p "
3891 "on suspend\n", cqr);
3892 spin_unlock_irq(get_ccwdev_lock(device->cdev));
3893 dasd_put_device(device);
3897 list_move_tail(&cqr->devlist, &requeue_queue);
3899 spin_unlock_irq(get_ccwdev_lock(device->cdev));
3901 list_for_each_entry_safe(cqr, n, &requeue_queue, devlist) {
3902 wait_event(dasd_flush_wq,
3903 (cqr->status != DASD_CQR_CLEAR_PENDING));
3905 /* mark sleepon requests as ended */
3906 if (cqr->callback_data == DASD_SLEEPON_START_TAG)
3907 cqr->callback_data = DASD_SLEEPON_END_TAG;
3909 /* remove requests from device and block queue */
3910 list_del_init(&cqr->devlist);
3911 while (cqr->refers != NULL) {
3912 refers = cqr->refers;
3913 /* remove the request from the block queue */
3914 list_del(&cqr->blocklist);
3915 /* free the finished erp request */
3916 dasd_free_erp_request(cqr, cqr->memdev);
3921 * requeue requests to blocklayer will only work
3922 * for block device requests
3924 if (_dasd_requeue_request(cqr))
3928 list_del_init(&cqr->blocklist);
3929 cqr->block->base->discipline->free_cp(
3930 cqr, (struct request *) cqr->callback_data);
3934 * if requests remain then they are internal request
3935 * and go back to the device queue
3937 if (!list_empty(&requeue_queue)) {
3938 /* move freeze_queue to start of the ccw_queue */
3939 spin_lock_irq(get_ccwdev_lock(device->cdev));
3940 list_splice_tail(&requeue_queue, &device->ccw_queue);
3941 spin_unlock_irq(get_ccwdev_lock(device->cdev));
3943 /* wake up generic waitqueue for eventually ended sleepon requests */
3944 wake_up(&generic_waitq);
3948 static void do_requeue_requests(struct work_struct *work)
3950 struct dasd_device *device = container_of(work, struct dasd_device,
3952 dasd_generic_requeue_all_requests(device);
3953 dasd_device_remove_stop_bits(device, DASD_STOPPED_NOT_ACC);
3955 dasd_schedule_block_bh(device->block);
3956 dasd_put_device(device);
3959 void dasd_schedule_requeue(struct dasd_device *device)
3961 dasd_get_device(device);
3962 /* queue call to dasd_reload_device to the kernel event daemon. */
3963 if (!schedule_work(&device->requeue_requests))
3964 dasd_put_device(device);
3966 EXPORT_SYMBOL(dasd_schedule_requeue);
3968 int dasd_generic_pm_freeze(struct ccw_device *cdev)
3970 struct dasd_device *device = dasd_device_from_cdev(cdev);
3973 return PTR_ERR(device);
3975 /* mark device as suspended */
3976 set_bit(DASD_FLAG_SUSPENDED, &device->flags);
3978 if (device->discipline->freeze)
3979 device->discipline->freeze(device);
3981 /* disallow new I/O */
3982 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
3984 return dasd_generic_requeue_all_requests(device);
3986 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
3988 int dasd_generic_restore_device(struct ccw_device *cdev)
3990 struct dasd_device *device = dasd_device_from_cdev(cdev);
3994 return PTR_ERR(device);
3996 /* allow new IO again */
3997 dasd_device_remove_stop_bits(device,
3998 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
4000 dasd_schedule_device_bh(device);
4003 * call discipline restore function
4004 * if device is stopped do nothing e.g. for disconnected devices
4006 if (device->discipline->restore && !(device->stopped))
4007 rc = device->discipline->restore(device);
4008 if (rc || device->stopped)
4010 * if the resume failed for the DASD we put it in
4011 * an UNRESUMED stop state
4013 device->stopped |= DASD_UNRESUMED_PM;
4015 if (device->block) {
4016 dasd_schedule_block_bh(device->block);
4017 if (device->block->request_queue)
4018 blk_mq_run_hw_queues(device->block->request_queue,
4022 clear_bit(DASD_FLAG_SUSPENDED, &device->flags);
4023 dasd_put_device(device);
4026 EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
4028 static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
4030 int rdc_buffer_size,
4033 struct dasd_ccw_req *cqr;
4035 unsigned long *idaw;
4037 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
4040 /* internal error 13 - Allocating the RDC request failed*/
4041 dev_err(&device->cdev->dev,
4042 "An error occurred in the DASD device driver, "
4043 "reason=%s\n", "13");
4048 ccw->cmd_code = CCW_CMD_RDC;
4049 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
4050 idaw = (unsigned long *) (cqr->data);
4051 ccw->cda = (__u32)(addr_t) idaw;
4052 ccw->flags = CCW_FLAG_IDA;
4053 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
4055 ccw->cda = (__u32)(addr_t) rdc_buffer;
4059 ccw->count = rdc_buffer_size;
4060 cqr->startdev = device;
4061 cqr->memdev = device;
4062 cqr->expires = 10*HZ;
4064 cqr->buildclk = get_tod_clock();
4065 cqr->status = DASD_CQR_FILLED;
4070 int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
4071 void *rdc_buffer, int rdc_buffer_size)
4074 struct dasd_ccw_req *cqr;
4076 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
4079 return PTR_ERR(cqr);
4081 ret = dasd_sleep_on(cqr);
4082 dasd_sfree_request(cqr, cqr->memdev);
4085 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
4088 * In command mode and transport mode we need to look for sense
4089 * data in different places. The sense data itself is allways
4090 * an array of 32 bytes, so we can unify the sense data access
4093 char *dasd_get_sense(struct irb *irb)
4095 struct tsb *tsb = NULL;
4098 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
4099 if (irb->scsw.tm.tcw)
4100 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
4102 if (tsb && tsb->length == 64 && tsb->flags)
4103 switch (tsb->flags & 0x07) {
4104 case 1: /* tsa_iostat */
4105 sense = tsb->tsa.iostat.sense;
4107 case 2: /* tsa_ddpc */
4108 sense = tsb->tsa.ddpc.sense;
4111 /* currently we don't use interrogate data */
4114 } else if (irb->esw.esw0.erw.cons) {
4119 EXPORT_SYMBOL_GPL(dasd_get_sense);
4121 void dasd_generic_shutdown(struct ccw_device *cdev)
4123 struct dasd_device *device;
4125 device = dasd_device_from_cdev(cdev);
4130 dasd_schedule_block_bh(device->block);
4132 dasd_schedule_device_bh(device);
4134 wait_event(shutdown_waitq, _wait_for_empty_queues(device));
4136 EXPORT_SYMBOL_GPL(dasd_generic_shutdown);
4138 static int __init dasd_init(void)
4142 init_waitqueue_head(&dasd_init_waitq);
4143 init_waitqueue_head(&dasd_flush_wq);
4144 init_waitqueue_head(&generic_waitq);
4145 init_waitqueue_head(&shutdown_waitq);
4147 /* register 'common' DASD debug area, used for all DBF_XXX calls */
4148 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
4149 if (dasd_debug_area == NULL) {
4153 debug_register_view(dasd_debug_area, &debug_sprintf_view);
4154 debug_set_level(dasd_debug_area, DBF_WARNING);
4156 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
4158 dasd_diag_discipline_pointer = NULL;
4160 dasd_statistics_createroot();
4162 rc = dasd_devmap_init();
4165 rc = dasd_gendisk_init();
4171 rc = dasd_eer_init();
4174 #ifdef CONFIG_PROC_FS
4175 rc = dasd_proc_init();
4182 pr_info("The DASD device driver could not be initialized\n");
4187 module_init(dasd_init);
4188 module_exit(dasd_exit);