2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Horst Hummel <Horst.Hummel@de.ibm.com>
4 * Carsten Otte <Cotte@de.ibm.com>
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
7 * Copyright IBM Corp. 1999, 2009
10 #define KMSG_COMPONENT "dasd"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13 #include <linux/kmod.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/ctype.h>
17 #include <linux/major.h>
18 #include <linux/slab.h>
19 #include <linux/hdreg.h>
20 #include <linux/async.h>
21 #include <linux/mutex.h>
22 #include <linux/debugfs.h>
23 #include <linux/seq_file.h>
24 #include <linux/vmalloc.h>
26 #include <asm/ccwdev.h>
27 #include <asm/ebcdic.h>
28 #include <asm/idals.h>
33 #define PRINTK_HEADER "dasd:"
37 * SECTION: Constant definitions to be used within this file
39 #define DASD_CHANQ_MAX_SIZE 4
41 #define DASD_SLEEPON_START_TAG (void *) 1
42 #define DASD_SLEEPON_END_TAG (void *) 2
45 * SECTION: exported variables of dasd.c
47 debug_info_t *dasd_debug_area;
48 static struct dentry *dasd_debugfs_root_entry;
49 struct dasd_discipline *dasd_diag_discipline_pointer;
50 void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
52 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
53 MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
54 " Copyright IBM Corp. 2000");
55 MODULE_SUPPORTED_DEVICE("dasd");
56 MODULE_LICENSE("GPL");
59 * SECTION: prototypes for static functions of dasd.c
61 static int dasd_alloc_queue(struct dasd_block *);
62 static void dasd_setup_queue(struct dasd_block *);
63 static void dasd_free_queue(struct dasd_block *);
64 static void dasd_flush_request_queue(struct dasd_block *);
65 static int dasd_flush_block_queue(struct dasd_block *);
66 static void dasd_device_tasklet(struct dasd_device *);
67 static void dasd_block_tasklet(struct dasd_block *);
68 static void do_kick_device(struct work_struct *);
69 static void do_restore_device(struct work_struct *);
70 static void do_reload_device(struct work_struct *);
71 static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
72 static void dasd_device_timeout(unsigned long);
73 static void dasd_block_timeout(unsigned long);
74 static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *);
75 static void dasd_profile_init(struct dasd_profile *, struct dentry *);
76 static void dasd_profile_exit(struct dasd_profile *);
79 * SECTION: Operations on the device structure.
81 static wait_queue_head_t dasd_init_waitq;
82 static wait_queue_head_t dasd_flush_wq;
83 static wait_queue_head_t generic_waitq;
84 static wait_queue_head_t shutdown_waitq;
87 * Allocate memory for a new device structure.
89 struct dasd_device *dasd_alloc_device(void)
91 struct dasd_device *device;
93 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC);
95 return ERR_PTR(-ENOMEM);
97 /* Get two pages for normal block device operations. */
98 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
99 if (!device->ccw_mem) {
101 return ERR_PTR(-ENOMEM);
103 /* Get one page for error recovery. */
104 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
105 if (!device->erp_mem) {
106 free_pages((unsigned long) device->ccw_mem, 1);
108 return ERR_PTR(-ENOMEM);
111 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
112 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
113 spin_lock_init(&device->mem_lock);
114 atomic_set(&device->tasklet_scheduled, 0);
115 tasklet_init(&device->tasklet,
116 (void (*)(unsigned long)) dasd_device_tasklet,
117 (unsigned long) device);
118 INIT_LIST_HEAD(&device->ccw_queue);
119 init_timer(&device->timer);
120 device->timer.function = dasd_device_timeout;
121 device->timer.data = (unsigned long) device;
122 INIT_WORK(&device->kick_work, do_kick_device);
123 INIT_WORK(&device->restore_device, do_restore_device);
124 INIT_WORK(&device->reload_device, do_reload_device);
125 device->state = DASD_STATE_NEW;
126 device->target = DASD_STATE_NEW;
127 mutex_init(&device->state_mutex);
128 spin_lock_init(&device->profile.lock);
133 * Free memory of a device structure.
135 void dasd_free_device(struct dasd_device *device)
137 kfree(device->private);
138 free_page((unsigned long) device->erp_mem);
139 free_pages((unsigned long) device->ccw_mem, 1);
144 * Allocate memory for a new device structure.
146 struct dasd_block *dasd_alloc_block(void)
148 struct dasd_block *block;
150 block = kzalloc(sizeof(*block), GFP_ATOMIC);
152 return ERR_PTR(-ENOMEM);
153 /* open_count = 0 means device online but not in use */
154 atomic_set(&block->open_count, -1);
156 spin_lock_init(&block->request_queue_lock);
157 atomic_set(&block->tasklet_scheduled, 0);
158 tasklet_init(&block->tasklet,
159 (void (*)(unsigned long)) dasd_block_tasklet,
160 (unsigned long) block);
161 INIT_LIST_HEAD(&block->ccw_queue);
162 spin_lock_init(&block->queue_lock);
163 init_timer(&block->timer);
164 block->timer.function = dasd_block_timeout;
165 block->timer.data = (unsigned long) block;
166 spin_lock_init(&block->profile.lock);
172 * Free memory of a device structure.
174 void dasd_free_block(struct dasd_block *block)
180 * Make a new device known to the system.
182 static int dasd_state_new_to_known(struct dasd_device *device)
187 * As long as the device is not in state DASD_STATE_NEW we want to
188 * keep the reference count > 0.
190 dasd_get_device(device);
193 rc = dasd_alloc_queue(device->block);
195 dasd_put_device(device);
199 device->state = DASD_STATE_KNOWN;
204 * Let the system forget about a device.
206 static int dasd_state_known_to_new(struct dasd_device *device)
208 /* Disable extended error reporting for this device. */
209 dasd_eer_disable(device);
210 /* Forget the discipline information. */
211 if (device->discipline) {
212 if (device->discipline->uncheck_device)
213 device->discipline->uncheck_device(device);
214 module_put(device->discipline->owner);
216 device->discipline = NULL;
217 if (device->base_discipline)
218 module_put(device->base_discipline->owner);
219 device->base_discipline = NULL;
220 device->state = DASD_STATE_NEW;
223 dasd_free_queue(device->block);
225 /* Give up reference we took in dasd_state_new_to_known. */
226 dasd_put_device(device);
230 static struct dentry *dasd_debugfs_setup(const char *name,
231 struct dentry *base_dentry)
237 pde = debugfs_create_dir(name, base_dentry);
238 if (!pde || IS_ERR(pde))
244 * Request the irq line for the device.
246 static int dasd_state_known_to_basic(struct dasd_device *device)
248 struct dasd_block *block = device->block;
251 /* Allocate and register gendisk structure. */
253 rc = dasd_gendisk_alloc(block);
256 block->debugfs_dentry =
257 dasd_debugfs_setup(block->gdp->disk_name,
258 dasd_debugfs_root_entry);
259 dasd_profile_init(&block->profile, block->debugfs_dentry);
260 if (dasd_global_profile_level == DASD_PROFILE_ON)
261 dasd_profile_on(&device->block->profile);
263 device->debugfs_dentry =
264 dasd_debugfs_setup(dev_name(&device->cdev->dev),
265 dasd_debugfs_root_entry);
266 dasd_profile_init(&device->profile, device->debugfs_dentry);
268 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
269 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1,
271 debug_register_view(device->debug_area, &debug_sprintf_view);
272 debug_set_level(device->debug_area, DBF_WARNING);
273 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
275 device->state = DASD_STATE_BASIC;
280 * Release the irq line for the device. Terminate any running i/o.
282 static int dasd_state_basic_to_known(struct dasd_device *device)
286 dasd_profile_exit(&device->block->profile);
287 if (device->block->debugfs_dentry)
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 if (device->debugfs_dentry)
298 debugfs_remove(device->debugfs_dentry);
300 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
301 if (device->debug_area != NULL) {
302 debug_unregister(device->debug_area);
303 device->debug_area = NULL;
305 device->state = DASD_STATE_KNOWN;
310 * Do the initial analysis. The do_analysis function may return
311 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
312 * until the discipline decides to continue the startup sequence
313 * by calling the function dasd_change_state. The eckd disciplines
314 * uses this to start a ccw that detects the format. The completion
315 * interrupt for this detection ccw uses the kernel event daemon to
316 * trigger the call to dasd_change_state. All this is done in the
317 * discipline code, see dasd_eckd.c.
318 * After the analysis ccw is done (do_analysis returned 0) the block
320 * In case the analysis returns an error, the device setup is stopped
321 * (a fake disk was already added to allow formatting).
323 static int dasd_state_basic_to_ready(struct dasd_device *device)
326 struct dasd_block *block;
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;
339 dasd_setup_queue(block);
340 set_capacity(block->gdp,
341 block->blocks << block->s2b_shift);
342 device->state = DASD_STATE_READY;
343 rc = dasd_scan_partitions(block);
345 device->state = DASD_STATE_BASIC;
347 device->state = DASD_STATE_READY;
353 * Remove device from block device layer. Destroy dirty buffers.
354 * Forget format information. Check if the target level is basic
355 * and if it is create fake disk for formatting.
357 static int dasd_state_ready_to_basic(struct dasd_device *device)
361 device->state = DASD_STATE_BASIC;
363 struct dasd_block *block = device->block;
364 rc = dasd_flush_block_queue(block);
366 device->state = DASD_STATE_READY;
369 dasd_flush_request_queue(block);
370 dasd_destroy_partitions(block);
373 block->s2b_shift = 0;
381 static int dasd_state_unfmt_to_basic(struct dasd_device *device)
383 device->state = DASD_STATE_BASIC;
388 * Make the device online and schedule the bottom half to start
389 * the requeueing of requests from the linux request queue to the
393 dasd_state_ready_to_online(struct dasd_device * device)
396 struct gendisk *disk;
397 struct disk_part_iter piter;
398 struct hd_struct *part;
400 if (device->discipline->ready_to_online) {
401 rc = device->discipline->ready_to_online(device);
405 device->state = DASD_STATE_ONLINE;
407 dasd_schedule_block_bh(device->block);
408 if ((device->features & DASD_FEATURE_USERAW)) {
409 disk = device->block->gdp;
410 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
413 disk = device->block->bdev->bd_disk;
414 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
415 while ((part = disk_part_iter_next(&piter)))
416 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
417 disk_part_iter_exit(&piter);
423 * Stop the requeueing of requests again.
425 static int dasd_state_online_to_ready(struct dasd_device *device)
428 struct gendisk *disk;
429 struct disk_part_iter piter;
430 struct hd_struct *part;
432 if (device->discipline->online_to_ready) {
433 rc = device->discipline->online_to_ready(device);
437 device->state = DASD_STATE_READY;
438 if (device->block && !(device->features & DASD_FEATURE_USERAW)) {
439 disk = device->block->bdev->bd_disk;
440 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
441 while ((part = disk_part_iter_next(&piter)))
442 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
443 disk_part_iter_exit(&piter);
449 * Device startup state changes.
451 static int dasd_increase_state(struct dasd_device *device)
456 if (device->state == DASD_STATE_NEW &&
457 device->target >= DASD_STATE_KNOWN)
458 rc = dasd_state_new_to_known(device);
461 device->state == DASD_STATE_KNOWN &&
462 device->target >= DASD_STATE_BASIC)
463 rc = dasd_state_known_to_basic(device);
466 device->state == DASD_STATE_BASIC &&
467 device->target >= DASD_STATE_READY)
468 rc = dasd_state_basic_to_ready(device);
471 device->state == DASD_STATE_UNFMT &&
472 device->target > DASD_STATE_UNFMT)
476 device->state == DASD_STATE_READY &&
477 device->target >= DASD_STATE_ONLINE)
478 rc = dasd_state_ready_to_online(device);
484 * Device shutdown state changes.
486 static int dasd_decrease_state(struct dasd_device *device)
491 if (device->state == DASD_STATE_ONLINE &&
492 device->target <= DASD_STATE_READY)
493 rc = dasd_state_online_to_ready(device);
496 device->state == DASD_STATE_READY &&
497 device->target <= DASD_STATE_BASIC)
498 rc = dasd_state_ready_to_basic(device);
501 device->state == DASD_STATE_UNFMT &&
502 device->target <= DASD_STATE_BASIC)
503 rc = dasd_state_unfmt_to_basic(device);
506 device->state == DASD_STATE_BASIC &&
507 device->target <= DASD_STATE_KNOWN)
508 rc = dasd_state_basic_to_known(device);
511 device->state == DASD_STATE_KNOWN &&
512 device->target <= DASD_STATE_NEW)
513 rc = dasd_state_known_to_new(device);
519 * This is the main startup/shutdown routine.
521 static void dasd_change_state(struct dasd_device *device)
525 if (device->state == device->target)
526 /* Already where we want to go today... */
528 if (device->state < device->target)
529 rc = dasd_increase_state(device);
531 rc = dasd_decrease_state(device);
535 device->target = device->state;
537 /* let user-space know that the device status changed */
538 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
540 if (device->state == device->target)
541 wake_up(&dasd_init_waitq);
545 * Kick starter for devices that did not complete the startup/shutdown
546 * procedure or were sleeping because of a pending state.
547 * dasd_kick_device will schedule a call do do_kick_device to the kernel
550 static void do_kick_device(struct work_struct *work)
552 struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
553 mutex_lock(&device->state_mutex);
554 dasd_change_state(device);
555 mutex_unlock(&device->state_mutex);
556 dasd_schedule_device_bh(device);
557 dasd_put_device(device);
560 void dasd_kick_device(struct dasd_device *device)
562 dasd_get_device(device);
563 /* queue call to dasd_kick_device to the kernel event daemon. */
564 schedule_work(&device->kick_work);
568 * dasd_reload_device will schedule a call do do_reload_device to the kernel
571 static void do_reload_device(struct work_struct *work)
573 struct dasd_device *device = container_of(work, struct dasd_device,
575 device->discipline->reload(device);
576 dasd_put_device(device);
579 void dasd_reload_device(struct dasd_device *device)
581 dasd_get_device(device);
582 /* queue call to dasd_reload_device to the kernel event daemon. */
583 schedule_work(&device->reload_device);
585 EXPORT_SYMBOL(dasd_reload_device);
588 * dasd_restore_device will schedule a call do do_restore_device to the kernel
591 static void do_restore_device(struct work_struct *work)
593 struct dasd_device *device = container_of(work, struct dasd_device,
595 device->cdev->drv->restore(device->cdev);
596 dasd_put_device(device);
599 void dasd_restore_device(struct dasd_device *device)
601 dasd_get_device(device);
602 /* queue call to dasd_restore_device to the kernel event daemon. */
603 schedule_work(&device->restore_device);
607 * Set the target state for a device and starts the state change.
609 void dasd_set_target_state(struct dasd_device *device, int target)
611 dasd_get_device(device);
612 mutex_lock(&device->state_mutex);
613 /* If we are in probeonly mode stop at DASD_STATE_READY. */
614 if (dasd_probeonly && target > DASD_STATE_READY)
615 target = DASD_STATE_READY;
616 if (device->target != target) {
617 if (device->state == target)
618 wake_up(&dasd_init_waitq);
619 device->target = target;
621 if (device->state != device->target)
622 dasd_change_state(device);
623 mutex_unlock(&device->state_mutex);
624 dasd_put_device(device);
628 * Enable devices with device numbers in [from..to].
630 static inline int _wait_for_device(struct dasd_device *device)
632 return (device->state == device->target);
635 void dasd_enable_device(struct dasd_device *device)
637 dasd_set_target_state(device, DASD_STATE_ONLINE);
638 if (device->state <= DASD_STATE_KNOWN)
639 /* No discipline for device found. */
640 dasd_set_target_state(device, DASD_STATE_NEW);
641 /* Now wait for the devices to come up. */
642 wait_event(dasd_init_waitq, _wait_for_device(device));
644 dasd_reload_device(device);
645 if (device->discipline->kick_validate)
646 device->discipline->kick_validate(device);
650 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
653 unsigned int dasd_global_profile_level = DASD_PROFILE_OFF;
655 #ifdef CONFIG_DASD_PROFILE
656 struct dasd_profile_info dasd_global_profile_data;
657 static struct dentry *dasd_global_profile_dentry;
658 static struct dentry *dasd_debugfs_global_entry;
661 * Add profiling information for cqr before execution.
663 static void dasd_profile_start(struct dasd_block *block,
664 struct dasd_ccw_req *cqr,
668 unsigned int counter;
669 struct dasd_device *device;
671 /* count the length of the chanq for statistics */
673 if (dasd_global_profile_level || block->profile.data)
674 list_for_each(l, &block->ccw_queue)
678 if (dasd_global_profile_level) {
679 dasd_global_profile_data.dasd_io_nr_req[counter]++;
680 if (rq_data_dir(req) == READ)
681 dasd_global_profile_data.dasd_read_nr_req[counter]++;
684 spin_lock(&block->profile.lock);
685 if (block->profile.data)
686 block->profile.data->dasd_io_nr_req[counter]++;
687 if (rq_data_dir(req) == READ)
688 block->profile.data->dasd_read_nr_req[counter]++;
689 spin_unlock(&block->profile.lock);
692 * We count the request for the start device, even though it may run on
693 * some other device due to error recovery. This way we make sure that
694 * we count each request only once.
696 device = cqr->startdev;
697 if (device->profile.data) {
698 counter = 1; /* request is not yet queued on the start device */
699 list_for_each(l, &device->ccw_queue)
703 spin_lock(&device->profile.lock);
704 if (device->profile.data) {
705 device->profile.data->dasd_io_nr_req[counter]++;
706 if (rq_data_dir(req) == READ)
707 device->profile.data->dasd_read_nr_req[counter]++;
709 spin_unlock(&device->profile.lock);
713 * Add profiling information for cqr after execution.
716 #define dasd_profile_counter(value, index) \
718 for (index = 0; index < 31 && value >> (2+index); index++) \
722 static void dasd_profile_end_add_data(struct dasd_profile_info *data,
735 /* in case of an overflow, reset the whole profile */
736 if (data->dasd_io_reqs == UINT_MAX) {
737 memset(data, 0, sizeof(*data));
738 getnstimeofday(&data->starttod);
740 data->dasd_io_reqs++;
741 data->dasd_io_sects += sectors;
743 data->dasd_io_alias++;
747 data->dasd_io_secs[sectors_ind]++;
748 data->dasd_io_times[tottime_ind]++;
749 data->dasd_io_timps[tottimeps_ind]++;
750 data->dasd_io_time1[strtime_ind]++;
751 data->dasd_io_time2[irqtime_ind]++;
752 data->dasd_io_time2ps[irqtimeps_ind]++;
753 data->dasd_io_time3[endtime_ind]++;
756 data->dasd_read_reqs++;
757 data->dasd_read_sects += sectors;
759 data->dasd_read_alias++;
761 data->dasd_read_tpm++;
762 data->dasd_read_secs[sectors_ind]++;
763 data->dasd_read_times[tottime_ind]++;
764 data->dasd_read_time1[strtime_ind]++;
765 data->dasd_read_time2[irqtime_ind]++;
766 data->dasd_read_time3[endtime_ind]++;
770 static void dasd_profile_end(struct dasd_block *block,
771 struct dasd_ccw_req *cqr,
774 long strtime, irqtime, endtime, tottime; /* in microseconds */
775 long tottimeps, sectors;
776 struct dasd_device *device;
777 int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind;
778 int irqtime_ind, irqtimeps_ind, endtime_ind;
780 device = cqr->startdev;
781 if (!(dasd_global_profile_level ||
782 block->profile.data ||
783 device->profile.data))
786 sectors = blk_rq_sectors(req);
787 if (!cqr->buildclk || !cqr->startclk ||
788 !cqr->stopclk || !cqr->endclk ||
792 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
793 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
794 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
795 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
796 tottimeps = tottime / sectors;
798 dasd_profile_counter(sectors, sectors_ind);
799 dasd_profile_counter(tottime, tottime_ind);
800 dasd_profile_counter(tottimeps, tottimeps_ind);
801 dasd_profile_counter(strtime, strtime_ind);
802 dasd_profile_counter(irqtime, irqtime_ind);
803 dasd_profile_counter(irqtime / sectors, irqtimeps_ind);
804 dasd_profile_counter(endtime, endtime_ind);
806 if (dasd_global_profile_level) {
807 dasd_profile_end_add_data(&dasd_global_profile_data,
808 cqr->startdev != block->base,
810 rq_data_dir(req) == READ,
811 sectors, sectors_ind, tottime_ind,
812 tottimeps_ind, strtime_ind,
813 irqtime_ind, irqtimeps_ind,
817 spin_lock(&block->profile.lock);
818 if (block->profile.data)
819 dasd_profile_end_add_data(block->profile.data,
820 cqr->startdev != block->base,
822 rq_data_dir(req) == READ,
823 sectors, sectors_ind, tottime_ind,
824 tottimeps_ind, strtime_ind,
825 irqtime_ind, irqtimeps_ind,
827 spin_unlock(&block->profile.lock);
829 spin_lock(&device->profile.lock);
830 if (device->profile.data)
831 dasd_profile_end_add_data(device->profile.data,
832 cqr->startdev != block->base,
834 rq_data_dir(req) == READ,
835 sectors, sectors_ind, tottime_ind,
836 tottimeps_ind, strtime_ind,
837 irqtime_ind, irqtimeps_ind,
839 spin_unlock(&device->profile.lock);
842 void dasd_profile_reset(struct dasd_profile *profile)
844 struct dasd_profile_info *data;
846 spin_lock_bh(&profile->lock);
847 data = profile->data;
849 spin_unlock_bh(&profile->lock);
852 memset(data, 0, sizeof(*data));
853 getnstimeofday(&data->starttod);
854 spin_unlock_bh(&profile->lock);
857 void dasd_global_profile_reset(void)
859 memset(&dasd_global_profile_data, 0, sizeof(dasd_global_profile_data));
860 getnstimeofday(&dasd_global_profile_data.starttod);
863 int dasd_profile_on(struct dasd_profile *profile)
865 struct dasd_profile_info *data;
867 data = kzalloc(sizeof(*data), GFP_KERNEL);
870 spin_lock_bh(&profile->lock);
872 spin_unlock_bh(&profile->lock);
876 getnstimeofday(&data->starttod);
877 profile->data = data;
878 spin_unlock_bh(&profile->lock);
882 void dasd_profile_off(struct dasd_profile *profile)
884 spin_lock_bh(&profile->lock);
885 kfree(profile->data);
886 profile->data = NULL;
887 spin_unlock_bh(&profile->lock);
890 char *dasd_get_user_string(const char __user *user_buf, size_t user_len)
894 buffer = vmalloc(user_len + 1);
896 return ERR_PTR(-ENOMEM);
897 if (copy_from_user(buffer, user_buf, user_len) != 0) {
899 return ERR_PTR(-EFAULT);
901 /* got the string, now strip linefeed. */
902 if (buffer[user_len - 1] == '\n')
903 buffer[user_len - 1] = 0;
905 buffer[user_len] = 0;
909 static ssize_t dasd_stats_write(struct file *file,
910 const char __user *user_buf,
911 size_t user_len, loff_t *pos)
915 struct seq_file *m = (struct seq_file *)file->private_data;
916 struct dasd_profile *prof = m->private;
918 if (user_len > 65536)
920 buffer = dasd_get_user_string(user_buf, user_len);
922 return PTR_ERR(buffer);
924 str = skip_spaces(buffer);
926 if (strncmp(str, "reset", 5) == 0) {
927 dasd_profile_reset(prof);
928 } else if (strncmp(str, "on", 2) == 0) {
929 rc = dasd_profile_on(prof);
932 } else if (strncmp(str, "off", 3) == 0) {
933 dasd_profile_off(prof);
940 static void dasd_stats_array(struct seq_file *m, unsigned int *array)
944 for (i = 0; i < 32; i++)
945 seq_printf(m, "%u ", array[i]);
949 static void dasd_stats_seq_print(struct seq_file *m,
950 struct dasd_profile_info *data)
952 seq_printf(m, "start_time %ld.%09ld\n",
953 data->starttod.tv_sec, data->starttod.tv_nsec);
954 seq_printf(m, "total_requests %u\n", data->dasd_io_reqs);
955 seq_printf(m, "total_sectors %u\n", data->dasd_io_sects);
956 seq_printf(m, "total_pav %u\n", data->dasd_io_alias);
957 seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm);
958 seq_printf(m, "histogram_sectors ");
959 dasd_stats_array(m, data->dasd_io_secs);
960 seq_printf(m, "histogram_io_times ");
961 dasd_stats_array(m, data->dasd_io_times);
962 seq_printf(m, "histogram_io_times_weighted ");
963 dasd_stats_array(m, data->dasd_io_timps);
964 seq_printf(m, "histogram_time_build_to_ssch ");
965 dasd_stats_array(m, data->dasd_io_time1);
966 seq_printf(m, "histogram_time_ssch_to_irq ");
967 dasd_stats_array(m, data->dasd_io_time2);
968 seq_printf(m, "histogram_time_ssch_to_irq_weighted ");
969 dasd_stats_array(m, data->dasd_io_time2ps);
970 seq_printf(m, "histogram_time_irq_to_end ");
971 dasd_stats_array(m, data->dasd_io_time3);
972 seq_printf(m, "histogram_ccw_queue_length ");
973 dasd_stats_array(m, data->dasd_io_nr_req);
974 seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs);
975 seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects);
976 seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias);
977 seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm);
978 seq_printf(m, "histogram_read_sectors ");
979 dasd_stats_array(m, data->dasd_read_secs);
980 seq_printf(m, "histogram_read_times ");
981 dasd_stats_array(m, data->dasd_read_times);
982 seq_printf(m, "histogram_read_time_build_to_ssch ");
983 dasd_stats_array(m, data->dasd_read_time1);
984 seq_printf(m, "histogram_read_time_ssch_to_irq ");
985 dasd_stats_array(m, data->dasd_read_time2);
986 seq_printf(m, "histogram_read_time_irq_to_end ");
987 dasd_stats_array(m, data->dasd_read_time3);
988 seq_printf(m, "histogram_read_ccw_queue_length ");
989 dasd_stats_array(m, data->dasd_read_nr_req);
992 static int dasd_stats_show(struct seq_file *m, void *v)
994 struct dasd_profile *profile;
995 struct dasd_profile_info *data;
997 profile = m->private;
998 spin_lock_bh(&profile->lock);
999 data = profile->data;
1001 spin_unlock_bh(&profile->lock);
1002 seq_printf(m, "disabled\n");
1005 dasd_stats_seq_print(m, data);
1006 spin_unlock_bh(&profile->lock);
1010 static int dasd_stats_open(struct inode *inode, struct file *file)
1012 struct dasd_profile *profile = inode->i_private;
1013 return single_open(file, dasd_stats_show, profile);
1016 static const struct file_operations dasd_stats_raw_fops = {
1017 .owner = THIS_MODULE,
1018 .open = dasd_stats_open,
1020 .llseek = seq_lseek,
1021 .release = single_release,
1022 .write = dasd_stats_write,
1025 static ssize_t dasd_stats_global_write(struct file *file,
1026 const char __user *user_buf,
1027 size_t user_len, loff_t *pos)
1032 if (user_len > 65536)
1034 buffer = dasd_get_user_string(user_buf, user_len);
1036 return PTR_ERR(buffer);
1037 str = skip_spaces(buffer);
1039 if (strncmp(str, "reset", 5) == 0) {
1040 dasd_global_profile_reset();
1041 } else if (strncmp(str, "on", 2) == 0) {
1042 dasd_global_profile_reset();
1043 dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY;
1044 } else if (strncmp(str, "off", 3) == 0) {
1045 dasd_global_profile_level = DASD_PROFILE_OFF;
1052 static int dasd_stats_global_show(struct seq_file *m, void *v)
1054 if (!dasd_global_profile_level) {
1055 seq_printf(m, "disabled\n");
1058 dasd_stats_seq_print(m, &dasd_global_profile_data);
1062 static int dasd_stats_global_open(struct inode *inode, struct file *file)
1064 return single_open(file, dasd_stats_global_show, NULL);
1067 static const struct file_operations dasd_stats_global_fops = {
1068 .owner = THIS_MODULE,
1069 .open = dasd_stats_global_open,
1071 .llseek = seq_lseek,
1072 .release = single_release,
1073 .write = dasd_stats_global_write,
1076 static void dasd_profile_init(struct dasd_profile *profile,
1077 struct dentry *base_dentry)
1084 profile->dentry = NULL;
1085 profile->data = NULL;
1086 mode = (S_IRUSR | S_IWUSR | S_IFREG);
1087 pde = debugfs_create_file("statistics", mode, base_dentry,
1088 profile, &dasd_stats_raw_fops);
1089 if (pde && !IS_ERR(pde))
1090 profile->dentry = pde;
1094 static void dasd_profile_exit(struct dasd_profile *profile)
1096 dasd_profile_off(profile);
1097 if (profile->dentry) {
1098 debugfs_remove(profile->dentry);
1099 profile->dentry = NULL;
1103 static void dasd_statistics_removeroot(void)
1105 dasd_global_profile_level = DASD_PROFILE_OFF;
1106 if (dasd_global_profile_dentry) {
1107 debugfs_remove(dasd_global_profile_dentry);
1108 dasd_global_profile_dentry = NULL;
1110 if (dasd_debugfs_global_entry)
1111 debugfs_remove(dasd_debugfs_global_entry);
1112 if (dasd_debugfs_root_entry)
1113 debugfs_remove(dasd_debugfs_root_entry);
1116 static void dasd_statistics_createroot(void)
1121 dasd_debugfs_root_entry = NULL;
1122 dasd_debugfs_global_entry = NULL;
1123 dasd_global_profile_dentry = NULL;
1124 pde = debugfs_create_dir("dasd", NULL);
1125 if (!pde || IS_ERR(pde))
1127 dasd_debugfs_root_entry = pde;
1128 pde = debugfs_create_dir("global", dasd_debugfs_root_entry);
1129 if (!pde || IS_ERR(pde))
1131 dasd_debugfs_global_entry = pde;
1133 mode = (S_IRUSR | S_IWUSR | S_IFREG);
1134 pde = debugfs_create_file("statistics", mode, dasd_debugfs_global_entry,
1135 NULL, &dasd_stats_global_fops);
1136 if (!pde || IS_ERR(pde))
1138 dasd_global_profile_dentry = pde;
1142 DBF_EVENT(DBF_ERR, "%s",
1143 "Creation of the dasd debugfs interface failed");
1144 dasd_statistics_removeroot();
1149 #define dasd_profile_start(block, cqr, req) do {} while (0)
1150 #define dasd_profile_end(block, cqr, req) do {} while (0)
1152 static void dasd_statistics_createroot(void)
1157 static void dasd_statistics_removeroot(void)
1162 int dasd_stats_generic_show(struct seq_file *m, void *v)
1164 seq_printf(m, "Statistics are not activated in this kernel\n");
1168 static void dasd_profile_init(struct dasd_profile *profile,
1169 struct dentry *base_dentry)
1174 static void dasd_profile_exit(struct dasd_profile *profile)
1179 int dasd_profile_on(struct dasd_profile *profile)
1184 #endif /* CONFIG_DASD_PROFILE */
1187 * Allocate memory for a channel program with 'cplength' channel
1188 * command words and 'datasize' additional space. There are two
1189 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
1190 * memory and 2) dasd_smalloc_request uses the static ccw memory
1191 * that gets allocated for each device.
1193 struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
1195 struct dasd_device *device)
1197 struct dasd_ccw_req *cqr;
1200 BUG_ON(datasize > PAGE_SIZE ||
1201 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
1203 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
1205 return ERR_PTR(-ENOMEM);
1208 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
1209 GFP_ATOMIC | GFP_DMA);
1210 if (cqr->cpaddr == NULL) {
1212 return ERR_PTR(-ENOMEM);
1217 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
1218 if (cqr->data == NULL) {
1221 return ERR_PTR(-ENOMEM);
1225 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1226 dasd_get_device(device);
1230 struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
1232 struct dasd_device *device)
1234 unsigned long flags;
1235 struct dasd_ccw_req *cqr;
1239 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
1241 size += cplength * sizeof(struct ccw1);
1244 spin_lock_irqsave(&device->mem_lock, flags);
1245 cqr = (struct dasd_ccw_req *)
1246 dasd_alloc_chunk(&device->ccw_chunks, size);
1247 spin_unlock_irqrestore(&device->mem_lock, flags);
1249 return ERR_PTR(-ENOMEM);
1250 memset(cqr, 0, sizeof(struct dasd_ccw_req));
1251 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
1254 cqr->cpaddr = (struct ccw1 *) data;
1255 data += cplength*sizeof(struct ccw1);
1256 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
1261 memset(cqr->data, 0, datasize);
1264 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1265 dasd_get_device(device);
1270 * Free memory of a channel program. This function needs to free all the
1271 * idal lists that might have been created by dasd_set_cda and the
1272 * struct dasd_ccw_req itself.
1274 void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1279 /* Clear any idals used for the request. */
1282 clear_normalized_cda(ccw);
1283 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
1288 dasd_put_device(device);
1291 void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1293 unsigned long flags;
1295 spin_lock_irqsave(&device->mem_lock, flags);
1296 dasd_free_chunk(&device->ccw_chunks, cqr);
1297 spin_unlock_irqrestore(&device->mem_lock, flags);
1298 dasd_put_device(device);
1302 * Check discipline magic in cqr.
1304 static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
1306 struct dasd_device *device;
1310 device = cqr->startdev;
1311 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
1312 DBF_DEV_EVENT(DBF_WARNING, device,
1313 " dasd_ccw_req 0x%08x magic doesn't match"
1314 " discipline 0x%08x",
1316 *(unsigned int *) device->discipline->name);
1323 * Terminate the current i/o and set the request to clear_pending.
1324 * Timer keeps device runnig.
1325 * ccw_device_clear can fail if the i/o subsystem
1328 int dasd_term_IO(struct dasd_ccw_req *cqr)
1330 struct dasd_device *device;
1332 char errorstring[ERRORLENGTH];
1335 rc = dasd_check_cqr(cqr);
1339 device = (struct dasd_device *) cqr->startdev;
1340 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
1341 rc = ccw_device_clear(device->cdev, (long) cqr);
1343 case 0: /* termination successful */
1344 cqr->status = DASD_CQR_CLEAR_PENDING;
1345 cqr->stopclk = get_clock();
1347 DBF_DEV_EVENT(DBF_DEBUG, device,
1348 "terminate cqr %p successful",
1352 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1353 "device gone, retry");
1356 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1357 "I/O error, retry");
1361 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1362 "device busy, retry later");
1365 /* internal error 10 - unknown rc*/
1366 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
1367 dev_err(&device->cdev->dev, "An error occurred in the "
1368 "DASD device driver, reason=%s\n", errorstring);
1374 dasd_schedule_device_bh(device);
1379 * Start the i/o. This start_IO can fail if the channel is really busy.
1380 * In that case set up a timer to start the request later.
1382 int dasd_start_IO(struct dasd_ccw_req *cqr)
1384 struct dasd_device *device;
1386 char errorstring[ERRORLENGTH];
1389 rc = dasd_check_cqr(cqr);
1394 device = (struct dasd_device *) cqr->startdev;
1396 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) ||
1397 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) &&
1398 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1399 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p "
1400 "because of stolen lock", cqr);
1401 cqr->status = DASD_CQR_ERROR;
1402 cqr->intrc = -EPERM;
1405 if (cqr->retries < 0) {
1406 /* internal error 14 - start_IO run out of retries */
1407 sprintf(errorstring, "14 %p", cqr);
1408 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1409 "device driver, reason=%s\n", errorstring);
1410 cqr->status = DASD_CQR_ERROR;
1413 cqr->startclk = get_clock();
1414 cqr->starttime = jiffies;
1416 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1417 cqr->lpm &= device->path_data.opm;
1419 cqr->lpm = device->path_data.opm;
1421 if (cqr->cpmode == 1) {
1422 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
1423 (long) cqr, cqr->lpm);
1425 rc = ccw_device_start(device->cdev, cqr->cpaddr,
1426 (long) cqr, cqr->lpm, 0);
1430 cqr->status = DASD_CQR_IN_IO;
1433 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1434 "start_IO: device busy, retry later");
1437 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1438 "start_IO: request timeout, retry later");
1441 /* -EACCES indicates that the request used only a subset of the
1442 * available paths and all these paths are gone. If the lpm of
1443 * this request was only a subset of the opm (e.g. the ppm) then
1444 * we just do a retry with all available paths.
1445 * If we already use the full opm, something is amiss, and we
1446 * need a full path verification.
1448 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1449 DBF_DEV_EVENT(DBF_WARNING, device,
1450 "start_IO: selected paths gone (%x)",
1452 } else if (cqr->lpm != device->path_data.opm) {
1453 cqr->lpm = device->path_data.opm;
1454 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
1455 "start_IO: selected paths gone,"
1456 " retry on all paths");
1458 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1459 "start_IO: all paths in opm gone,"
1460 " do path verification");
1461 dasd_generic_last_path_gone(device);
1462 device->path_data.opm = 0;
1463 device->path_data.ppm = 0;
1464 device->path_data.npm = 0;
1465 device->path_data.tbvpm =
1466 ccw_device_get_path_mask(device->cdev);
1470 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1471 "start_IO: -ENODEV device gone, retry");
1474 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1475 "start_IO: -EIO device gone, retry");
1478 /* most likely caused in power management context */
1479 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1480 "start_IO: -EINVAL device currently "
1484 /* internal error 11 - unknown rc */
1485 snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
1486 dev_err(&device->cdev->dev,
1487 "An error occurred in the DASD device driver, "
1488 "reason=%s\n", errorstring);
1497 * Timeout function for dasd devices. This is used for different purposes
1498 * 1) missing interrupt handler for normal operation
1499 * 2) delayed start of request where start_IO failed with -EBUSY
1500 * 3) timeout for missing state change interrupts
1501 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
1502 * DASD_CQR_QUEUED for 2) and 3).
1504 static void dasd_device_timeout(unsigned long ptr)
1506 unsigned long flags;
1507 struct dasd_device *device;
1509 device = (struct dasd_device *) ptr;
1510 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1511 /* re-activate request queue */
1512 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1513 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1514 dasd_schedule_device_bh(device);
1518 * Setup timeout for a device in jiffies.
1520 void dasd_device_set_timer(struct dasd_device *device, int expires)
1523 del_timer(&device->timer);
1525 mod_timer(&device->timer, jiffies + expires);
1529 * Clear timeout for a device.
1531 void dasd_device_clear_timer(struct dasd_device *device)
1533 del_timer(&device->timer);
1536 static void dasd_handle_killed_request(struct ccw_device *cdev,
1537 unsigned long intparm)
1539 struct dasd_ccw_req *cqr;
1540 struct dasd_device *device;
1544 cqr = (struct dasd_ccw_req *) intparm;
1545 if (cqr->status != DASD_CQR_IN_IO) {
1546 DBF_EVENT_DEVID(DBF_DEBUG, cdev,
1547 "invalid status in handle_killed_request: "
1548 "%02x", cqr->status);
1552 device = dasd_device_from_cdev_locked(cdev);
1553 if (IS_ERR(device)) {
1554 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1555 "unable to get device from cdev");
1559 if (!cqr->startdev ||
1560 device != cqr->startdev ||
1561 strncmp(cqr->startdev->discipline->ebcname,
1562 (char *) &cqr->magic, 4)) {
1563 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1564 "invalid device in request");
1565 dasd_put_device(device);
1569 /* Schedule request to be retried. */
1570 cqr->status = DASD_CQR_QUEUED;
1572 dasd_device_clear_timer(device);
1573 dasd_schedule_device_bh(device);
1574 dasd_put_device(device);
1577 void dasd_generic_handle_state_change(struct dasd_device *device)
1579 /* First of all start sense subsystem status request. */
1580 dasd_eer_snss(device);
1582 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1583 dasd_schedule_device_bh(device);
1585 dasd_schedule_block_bh(device->block);
1589 * Interrupt handler for "normal" ssch-io based dasd devices.
1591 void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1594 struct dasd_ccw_req *cqr, *next;
1595 struct dasd_device *device;
1596 unsigned long long now;
1600 switch (PTR_ERR(irb)) {
1604 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1605 "request timed out\n", __func__);
1608 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1609 "unknown error %ld\n", __func__,
1612 dasd_handle_killed_request(cdev, intparm);
1617 cqr = (struct dasd_ccw_req *) intparm;
1618 /* check for conditions that should be handled immediately */
1620 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1621 scsw_cstat(&irb->scsw) == 0)) {
1623 memcpy(&cqr->irb, irb, sizeof(*irb));
1624 device = dasd_device_from_cdev_locked(cdev);
1627 /* ignore unsolicited interrupts for DIAG discipline */
1628 if (device->discipline == dasd_diag_discipline_pointer) {
1629 dasd_put_device(device);
1632 device->discipline->dump_sense_dbf(device, irb, "int");
1633 if (device->features & DASD_FEATURE_ERPLOG)
1634 device->discipline->dump_sense(device, cqr, irb);
1635 device->discipline->check_for_device_change(device, cqr, irb);
1636 dasd_put_device(device);
1641 device = (struct dasd_device *) cqr->startdev;
1643 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
1644 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1645 "invalid device in request");
1649 /* Check for clear pending */
1650 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
1651 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
1652 cqr->status = DASD_CQR_CLEARED;
1653 dasd_device_clear_timer(device);
1654 wake_up(&dasd_flush_wq);
1655 dasd_schedule_device_bh(device);
1659 /* check status - the request might have been killed by dyn detach */
1660 if (cqr->status != DASD_CQR_IN_IO) {
1661 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1662 "status %02x", dev_name(&cdev->dev), cqr->status);
1668 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1669 scsw_cstat(&irb->scsw) == 0) {
1670 /* request was completed successfully */
1671 cqr->status = DASD_CQR_SUCCESS;
1673 /* Start first request on queue if possible -> fast_io. */
1674 if (cqr->devlist.next != &device->ccw_queue) {
1675 next = list_entry(cqr->devlist.next,
1676 struct dasd_ccw_req, devlist);
1678 } else { /* error */
1680 * If we don't want complex ERP for this request, then just
1681 * reset this and retry it in the fastpath
1683 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
1685 if (cqr->lpm == device->path_data.opm)
1686 DBF_DEV_EVENT(DBF_DEBUG, device,
1687 "default ERP in fastpath "
1688 "(%i retries left)",
1690 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
1691 cqr->lpm = device->path_data.opm;
1692 cqr->status = DASD_CQR_QUEUED;
1695 cqr->status = DASD_CQR_ERROR;
1697 if (next && (next->status == DASD_CQR_QUEUED) &&
1698 (!device->stopped)) {
1699 if (device->discipline->start_IO(next) == 0)
1700 expires = next->expires;
1703 dasd_device_set_timer(device, expires);
1705 dasd_device_clear_timer(device);
1706 dasd_schedule_device_bh(device);
1709 enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
1711 struct dasd_device *device;
1713 device = dasd_device_from_cdev_locked(cdev);
1717 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1718 device->state != device->target ||
1719 !device->discipline->check_for_device_change){
1720 dasd_put_device(device);
1723 if (device->discipline->dump_sense_dbf)
1724 device->discipline->dump_sense_dbf(device, irb, "uc");
1725 device->discipline->check_for_device_change(device, NULL, irb);
1726 dasd_put_device(device);
1728 return UC_TODO_RETRY;
1730 EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
1733 * If we have an error on a dasd_block layer request then we cancel
1734 * and return all further requests from the same dasd_block as well.
1736 static void __dasd_device_recovery(struct dasd_device *device,
1737 struct dasd_ccw_req *ref_cqr)
1739 struct list_head *l, *n;
1740 struct dasd_ccw_req *cqr;
1743 * only requeue request that came from the dasd_block layer
1745 if (!ref_cqr->block)
1748 list_for_each_safe(l, n, &device->ccw_queue) {
1749 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1750 if (cqr->status == DASD_CQR_QUEUED &&
1751 ref_cqr->block == cqr->block) {
1752 cqr->status = DASD_CQR_CLEARED;
1758 * Remove those ccw requests from the queue that need to be returned
1759 * to the upper layer.
1761 static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1762 struct list_head *final_queue)
1764 struct list_head *l, *n;
1765 struct dasd_ccw_req *cqr;
1767 /* Process request with final status. */
1768 list_for_each_safe(l, n, &device->ccw_queue) {
1769 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1771 /* Stop list processing at the first non-final request. */
1772 if (cqr->status == DASD_CQR_QUEUED ||
1773 cqr->status == DASD_CQR_IN_IO ||
1774 cqr->status == DASD_CQR_CLEAR_PENDING)
1776 if (cqr->status == DASD_CQR_ERROR) {
1777 __dasd_device_recovery(device, cqr);
1779 /* Rechain finished requests to final queue */
1780 list_move_tail(&cqr->devlist, final_queue);
1785 * the cqrs from the final queue are returned to the upper layer
1786 * by setting a dasd_block state and calling the callback function
1788 static void __dasd_device_process_final_queue(struct dasd_device *device,
1789 struct list_head *final_queue)
1791 struct list_head *l, *n;
1792 struct dasd_ccw_req *cqr;
1793 struct dasd_block *block;
1794 void (*callback)(struct dasd_ccw_req *, void *data);
1795 void *callback_data;
1796 char errorstring[ERRORLENGTH];
1798 list_for_each_safe(l, n, final_queue) {
1799 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1800 list_del_init(&cqr->devlist);
1802 callback = cqr->callback;
1803 callback_data = cqr->callback_data;
1805 spin_lock_bh(&block->queue_lock);
1806 switch (cqr->status) {
1807 case DASD_CQR_SUCCESS:
1808 cqr->status = DASD_CQR_DONE;
1810 case DASD_CQR_ERROR:
1811 cqr->status = DASD_CQR_NEED_ERP;
1813 case DASD_CQR_CLEARED:
1814 cqr->status = DASD_CQR_TERMINATED;
1817 /* internal error 12 - wrong cqr status*/
1818 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1819 dev_err(&device->cdev->dev,
1820 "An error occurred in the DASD device driver, "
1821 "reason=%s\n", errorstring);
1824 if (cqr->callback != NULL)
1825 (callback)(cqr, callback_data);
1827 spin_unlock_bh(&block->queue_lock);
1832 * Take a look at the first request on the ccw queue and check
1833 * if it reached its expire time. If so, terminate the IO.
1835 static void __dasd_device_check_expire(struct dasd_device *device)
1837 struct dasd_ccw_req *cqr;
1839 if (list_empty(&device->ccw_queue))
1841 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1842 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1843 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
1844 if (device->discipline->term_IO(cqr) != 0) {
1845 /* Hmpf, try again in 5 sec */
1846 dev_err(&device->cdev->dev,
1847 "cqr %p timed out (%lus) but cannot be "
1848 "ended, retrying in 5 s\n",
1849 cqr, (cqr->expires/HZ));
1850 cqr->expires += 5*HZ;
1851 dasd_device_set_timer(device, 5*HZ);
1853 dev_err(&device->cdev->dev,
1854 "cqr %p timed out (%lus), %i retries "
1855 "remaining\n", cqr, (cqr->expires/HZ),
1862 * Take a look at the first request on the ccw queue and check
1863 * if it needs to be started.
1865 static void __dasd_device_start_head(struct dasd_device *device)
1867 struct dasd_ccw_req *cqr;
1870 if (list_empty(&device->ccw_queue))
1872 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1873 if (cqr->status != DASD_CQR_QUEUED)
1875 /* when device is stopped, return request to previous layer
1876 * exception: only the disconnect or unresumed bits are set and the
1877 * cqr is a path verification request
1879 if (device->stopped &&
1880 !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
1881 && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) {
1882 cqr->intrc = -EAGAIN;
1883 cqr->status = DASD_CQR_CLEARED;
1884 dasd_schedule_device_bh(device);
1888 rc = device->discipline->start_IO(cqr);
1890 dasd_device_set_timer(device, cqr->expires);
1891 else if (rc == -EACCES) {
1892 dasd_schedule_device_bh(device);
1894 /* Hmpf, try again in 1/2 sec */
1895 dasd_device_set_timer(device, 50);
1898 static void __dasd_device_check_path_events(struct dasd_device *device)
1902 if (device->path_data.tbvpm) {
1903 if (device->stopped & ~(DASD_STOPPED_DC_WAIT |
1906 rc = device->discipline->verify_path(
1907 device, device->path_data.tbvpm);
1909 dasd_device_set_timer(device, 50);
1911 device->path_data.tbvpm = 0;
1916 * Go through all request on the dasd_device request queue,
1917 * terminate them on the cdev if necessary, and return them to the
1918 * submitting layer via callback.
1920 * Make sure that all 'submitting layers' still exist when
1921 * this function is called!. In other words, when 'device' is a base
1922 * device then all block layer requests must have been removed before
1923 * via dasd_flush_block_queue.
1925 int dasd_flush_device_queue(struct dasd_device *device)
1927 struct dasd_ccw_req *cqr, *n;
1929 struct list_head flush_queue;
1931 INIT_LIST_HEAD(&flush_queue);
1932 spin_lock_irq(get_ccwdev_lock(device->cdev));
1934 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
1935 /* Check status and move request to flush_queue */
1936 switch (cqr->status) {
1937 case DASD_CQR_IN_IO:
1938 rc = device->discipline->term_IO(cqr);
1940 /* unable to terminate requeust */
1941 dev_err(&device->cdev->dev,
1942 "Flushing the DASD request queue "
1943 "failed for request %p\n", cqr);
1944 /* stop flush processing */
1948 case DASD_CQR_QUEUED:
1949 cqr->stopclk = get_clock();
1950 cqr->status = DASD_CQR_CLEARED;
1952 default: /* no need to modify the others */
1955 list_move_tail(&cqr->devlist, &flush_queue);
1958 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1960 * After this point all requests must be in state CLEAR_PENDING,
1961 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
1962 * one of the others.
1964 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
1965 wait_event(dasd_flush_wq,
1966 (cqr->status != DASD_CQR_CLEAR_PENDING));
1968 * Now set each request back to TERMINATED, DONE or NEED_ERP
1969 * and call the callback function of flushed requests
1971 __dasd_device_process_final_queue(device, &flush_queue);
1976 * Acquire the device lock and process queues for the device.
1978 static void dasd_device_tasklet(struct dasd_device *device)
1980 struct list_head final_queue;
1982 atomic_set (&device->tasklet_scheduled, 0);
1983 INIT_LIST_HEAD(&final_queue);
1984 spin_lock_irq(get_ccwdev_lock(device->cdev));
1985 /* Check expire time of first request on the ccw queue. */
1986 __dasd_device_check_expire(device);
1987 /* find final requests on ccw queue */
1988 __dasd_device_process_ccw_queue(device, &final_queue);
1989 __dasd_device_check_path_events(device);
1990 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1991 /* Now call the callback function of requests with final status */
1992 __dasd_device_process_final_queue(device, &final_queue);
1993 spin_lock_irq(get_ccwdev_lock(device->cdev));
1994 /* Now check if the head of the ccw queue needs to be started. */
1995 __dasd_device_start_head(device);
1996 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1997 if (waitqueue_active(&shutdown_waitq))
1998 wake_up(&shutdown_waitq);
1999 dasd_put_device(device);
2003 * Schedules a call to dasd_tasklet over the device tasklet.
2005 void dasd_schedule_device_bh(struct dasd_device *device)
2007 /* Protect against rescheduling. */
2008 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
2010 dasd_get_device(device);
2011 tasklet_hi_schedule(&device->tasklet);
2014 void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
2016 device->stopped |= bits;
2018 EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
2020 void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
2022 device->stopped &= ~bits;
2023 if (!device->stopped)
2024 wake_up(&generic_waitq);
2026 EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
2029 * Queue a request to the head of the device ccw_queue.
2030 * Start the I/O if possible.
2032 void dasd_add_request_head(struct dasd_ccw_req *cqr)
2034 struct dasd_device *device;
2035 unsigned long flags;
2037 device = cqr->startdev;
2038 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2039 cqr->status = DASD_CQR_QUEUED;
2040 list_add(&cqr->devlist, &device->ccw_queue);
2041 /* let the bh start the request to keep them in order */
2042 dasd_schedule_device_bh(device);
2043 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2047 * Queue a request to the tail of the device ccw_queue.
2048 * Start the I/O if possible.
2050 void dasd_add_request_tail(struct dasd_ccw_req *cqr)
2052 struct dasd_device *device;
2053 unsigned long flags;
2055 device = cqr->startdev;
2056 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2057 cqr->status = DASD_CQR_QUEUED;
2058 list_add_tail(&cqr->devlist, &device->ccw_queue);
2059 /* let the bh start the request to keep them in order */
2060 dasd_schedule_device_bh(device);
2061 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2065 * Wakeup helper for the 'sleep_on' functions.
2067 void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
2069 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2070 cqr->callback_data = DASD_SLEEPON_END_TAG;
2071 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2072 wake_up(&generic_waitq);
2074 EXPORT_SYMBOL_GPL(dasd_wakeup_cb);
2076 static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
2078 struct dasd_device *device;
2081 device = cqr->startdev;
2082 spin_lock_irq(get_ccwdev_lock(device->cdev));
2083 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
2084 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2089 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
2091 static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
2093 struct dasd_device *device;
2094 dasd_erp_fn_t erp_fn;
2096 if (cqr->status == DASD_CQR_FILLED)
2098 device = cqr->startdev;
2099 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2100 if (cqr->status == DASD_CQR_TERMINATED) {
2101 device->discipline->handle_terminated_request(cqr);
2104 if (cqr->status == DASD_CQR_NEED_ERP) {
2105 erp_fn = device->discipline->erp_action(cqr);
2109 if (cqr->status == DASD_CQR_FAILED)
2110 dasd_log_sense(cqr, &cqr->irb);
2112 __dasd_process_erp(device, cqr);
2119 static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
2121 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2122 if (cqr->refers) /* erp is not done yet */
2124 return ((cqr->status != DASD_CQR_DONE) &&
2125 (cqr->status != DASD_CQR_FAILED));
2127 return (cqr->status == DASD_CQR_FILLED);
2130 static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
2132 struct dasd_device *device;
2134 struct list_head ccw_queue;
2135 struct dasd_ccw_req *cqr;
2137 INIT_LIST_HEAD(&ccw_queue);
2138 maincqr->status = DASD_CQR_FILLED;
2139 device = maincqr->startdev;
2140 list_add(&maincqr->blocklist, &ccw_queue);
2141 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
2142 cqr = list_first_entry(&ccw_queue,
2143 struct dasd_ccw_req, blocklist)) {
2145 if (__dasd_sleep_on_erp(cqr))
2147 if (cqr->status != DASD_CQR_FILLED) /* could be failed */
2149 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2150 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2151 cqr->status = DASD_CQR_FAILED;
2152 cqr->intrc = -EPERM;
2155 /* Non-temporary stop condition will trigger fail fast */
2156 if (device->stopped & ~DASD_STOPPED_PENDING &&
2157 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2158 (!dasd_eer_enabled(device))) {
2159 cqr->status = DASD_CQR_FAILED;
2160 cqr->intrc = -EAGAIN;
2163 /* Don't try to start requests if device is stopped */
2164 if (interruptible) {
2165 rc = wait_event_interruptible(
2166 generic_waitq, !(device->stopped));
2167 if (rc == -ERESTARTSYS) {
2168 cqr->status = DASD_CQR_FAILED;
2169 maincqr->intrc = rc;
2173 wait_event(generic_waitq, !(device->stopped));
2176 cqr->callback = dasd_wakeup_cb;
2178 cqr->callback_data = DASD_SLEEPON_START_TAG;
2179 dasd_add_request_tail(cqr);
2180 if (interruptible) {
2181 rc = wait_event_interruptible(
2182 generic_waitq, _wait_for_wakeup(cqr));
2183 if (rc == -ERESTARTSYS) {
2184 dasd_cancel_req(cqr);
2185 /* wait (non-interruptible) for final status */
2186 wait_event(generic_waitq,
2187 _wait_for_wakeup(cqr));
2188 cqr->status = DASD_CQR_FAILED;
2189 maincqr->intrc = rc;
2193 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2196 maincqr->endclk = get_clock();
2197 if ((maincqr->status != DASD_CQR_DONE) &&
2198 (maincqr->intrc != -ERESTARTSYS))
2199 dasd_log_sense(maincqr, &maincqr->irb);
2200 if (maincqr->status == DASD_CQR_DONE)
2202 else if (maincqr->intrc)
2203 rc = maincqr->intrc;
2210 * Queue a request to the tail of the device ccw_queue and wait for
2213 int dasd_sleep_on(struct dasd_ccw_req *cqr)
2215 return _dasd_sleep_on(cqr, 0);
2219 * Queue a request to the tail of the device ccw_queue and wait
2220 * interruptible for it's completion.
2222 int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
2224 return _dasd_sleep_on(cqr, 1);
2228 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
2229 * for eckd devices) the currently running request has to be terminated
2230 * and be put back to status queued, before the special request is added
2231 * to the head of the queue. Then the special request is waited on normally.
2233 static inline int _dasd_term_running_cqr(struct dasd_device *device)
2235 struct dasd_ccw_req *cqr;
2238 if (list_empty(&device->ccw_queue))
2240 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
2241 rc = device->discipline->term_IO(cqr);
2244 * CQR terminated because a more important request is pending.
2245 * Undo decreasing of retry counter because this is
2246 * not an error case.
2252 int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
2254 struct dasd_device *device;
2257 device = cqr->startdev;
2258 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2259 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2260 cqr->status = DASD_CQR_FAILED;
2261 cqr->intrc = -EPERM;
2264 spin_lock_irq(get_ccwdev_lock(device->cdev));
2265 rc = _dasd_term_running_cqr(device);
2267 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2270 cqr->callback = dasd_wakeup_cb;
2271 cqr->callback_data = DASD_SLEEPON_START_TAG;
2272 cqr->status = DASD_CQR_QUEUED;
2274 * add new request as second
2275 * first the terminated cqr needs to be finished
2277 list_add(&cqr->devlist, device->ccw_queue.next);
2279 /* let the bh start the request to keep them in order */
2280 dasd_schedule_device_bh(device);
2282 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2284 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2286 if (cqr->status == DASD_CQR_DONE)
2288 else if (cqr->intrc)
2296 * Cancels a request that was started with dasd_sleep_on_req.
2297 * This is useful to timeout requests. The request will be
2298 * terminated if it is currently in i/o.
2299 * Returns 1 if the request has been terminated.
2300 * 0 if there was no need to terminate the request (not started yet)
2301 * negative error code if termination failed
2302 * Cancellation of a request is an asynchronous operation! The calling
2303 * function has to wait until the request is properly returned via callback.
2305 int dasd_cancel_req(struct dasd_ccw_req *cqr)
2307 struct dasd_device *device = cqr->startdev;
2308 unsigned long flags;
2312 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2313 switch (cqr->status) {
2314 case DASD_CQR_QUEUED:
2315 /* request was not started - just set to cleared */
2316 cqr->status = DASD_CQR_CLEARED;
2318 case DASD_CQR_IN_IO:
2319 /* request in IO - terminate IO and release again */
2320 rc = device->discipline->term_IO(cqr);
2322 dev_err(&device->cdev->dev,
2323 "Cancelling request %p failed with rc=%d\n",
2326 cqr->stopclk = get_clock();
2329 default: /* already finished or clear pending - do nothing */
2332 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2333 dasd_schedule_device_bh(device);
2339 * SECTION: Operations of the dasd_block layer.
2343 * Timeout function for dasd_block. This is used when the block layer
2344 * is waiting for something that may not come reliably, (e.g. a state
2347 static void dasd_block_timeout(unsigned long ptr)
2349 unsigned long flags;
2350 struct dasd_block *block;
2352 block = (struct dasd_block *) ptr;
2353 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
2354 /* re-activate request queue */
2355 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
2356 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
2357 dasd_schedule_block_bh(block);
2361 * Setup timeout for a dasd_block in jiffies.
2363 void dasd_block_set_timer(struct dasd_block *block, int expires)
2366 del_timer(&block->timer);
2368 mod_timer(&block->timer, jiffies + expires);
2372 * Clear timeout for a dasd_block.
2374 void dasd_block_clear_timer(struct dasd_block *block)
2376 del_timer(&block->timer);
2380 * Process finished error recovery ccw.
2382 static void __dasd_process_erp(struct dasd_device *device,
2383 struct dasd_ccw_req *cqr)
2385 dasd_erp_fn_t erp_fn;
2387 if (cqr->status == DASD_CQR_DONE)
2388 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
2390 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
2391 erp_fn = device->discipline->erp_postaction(cqr);
2396 * Fetch requests from the block device queue.
2398 static void __dasd_process_request_queue(struct dasd_block *block)
2400 struct request_queue *queue;
2401 struct request *req;
2402 struct dasd_ccw_req *cqr;
2403 struct dasd_device *basedev;
2404 unsigned long flags;
2405 queue = block->request_queue;
2406 basedev = block->base;
2407 /* No queue ? Then there is nothing to do. */
2412 * We requeue request from the block device queue to the ccw
2413 * queue only in two states. In state DASD_STATE_READY the
2414 * partition detection is done and we need to requeue requests
2415 * for that. State DASD_STATE_ONLINE is normal block device
2418 if (basedev->state < DASD_STATE_READY) {
2419 while ((req = blk_fetch_request(block->request_queue)))
2420 __blk_end_request_all(req, -EIO);
2423 /* Now we try to fetch requests from the request queue */
2424 while ((req = blk_peek_request(queue))) {
2425 if (basedev->features & DASD_FEATURE_READONLY &&
2426 rq_data_dir(req) == WRITE) {
2427 DBF_DEV_EVENT(DBF_ERR, basedev,
2428 "Rejecting write request %p",
2430 blk_start_request(req);
2431 __blk_end_request_all(req, -EIO);
2434 cqr = basedev->discipline->build_cp(basedev, block, req);
2436 if (PTR_ERR(cqr) == -EBUSY)
2437 break; /* normal end condition */
2438 if (PTR_ERR(cqr) == -ENOMEM)
2439 break; /* terminate request queue loop */
2440 if (PTR_ERR(cqr) == -EAGAIN) {
2442 * The current request cannot be build right
2443 * now, we have to try later. If this request
2444 * is the head-of-queue we stop the device
2447 if (!list_empty(&block->ccw_queue))
2450 get_ccwdev_lock(basedev->cdev), flags);
2451 dasd_device_set_stop_bits(basedev,
2452 DASD_STOPPED_PENDING);
2453 spin_unlock_irqrestore(
2454 get_ccwdev_lock(basedev->cdev), flags);
2455 dasd_block_set_timer(block, HZ/2);
2458 DBF_DEV_EVENT(DBF_ERR, basedev,
2459 "CCW creation failed (rc=%ld) "
2462 blk_start_request(req);
2463 __blk_end_request_all(req, -EIO);
2467 * Note: callback is set to dasd_return_cqr_cb in
2468 * __dasd_block_start_head to cover erp requests as well
2470 cqr->callback_data = (void *) req;
2471 cqr->status = DASD_CQR_FILLED;
2472 blk_start_request(req);
2473 list_add_tail(&cqr->blocklist, &block->ccw_queue);
2474 dasd_profile_start(block, cqr, req);
2478 static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
2480 struct request *req;
2484 req = (struct request *) cqr->callback_data;
2485 dasd_profile_end(cqr->block, cqr, req);
2486 status = cqr->block->base->discipline->free_cp(cqr, req);
2488 error = status ? status : -EIO;
2489 __blk_end_request_all(req, error);
2493 * Process ccw request queue.
2495 static void __dasd_process_block_ccw_queue(struct dasd_block *block,
2496 struct list_head *final_queue)
2498 struct list_head *l, *n;
2499 struct dasd_ccw_req *cqr;
2500 dasd_erp_fn_t erp_fn;
2501 unsigned long flags;
2502 struct dasd_device *base = block->base;
2505 /* Process request with final status. */
2506 list_for_each_safe(l, n, &block->ccw_queue) {
2507 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2508 if (cqr->status != DASD_CQR_DONE &&
2509 cqr->status != DASD_CQR_FAILED &&
2510 cqr->status != DASD_CQR_NEED_ERP &&
2511 cqr->status != DASD_CQR_TERMINATED)
2514 if (cqr->status == DASD_CQR_TERMINATED) {
2515 base->discipline->handle_terminated_request(cqr);
2519 /* Process requests that may be recovered */
2520 if (cqr->status == DASD_CQR_NEED_ERP) {
2521 erp_fn = base->discipline->erp_action(cqr);
2522 if (IS_ERR(erp_fn(cqr)))
2527 /* log sense for fatal error */
2528 if (cqr->status == DASD_CQR_FAILED) {
2529 dasd_log_sense(cqr, &cqr->irb);
2532 /* First of all call extended error reporting. */
2533 if (dasd_eer_enabled(base) &&
2534 cqr->status == DASD_CQR_FAILED) {
2535 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
2537 /* restart request */
2538 cqr->status = DASD_CQR_FILLED;
2540 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
2541 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
2542 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
2547 /* Process finished ERP request. */
2549 __dasd_process_erp(base, cqr);
2553 /* Rechain finished requests to final queue */
2554 cqr->endclk = get_clock();
2555 list_move_tail(&cqr->blocklist, final_queue);
2559 static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
2561 dasd_schedule_block_bh(cqr->block);
2564 static void __dasd_block_start_head(struct dasd_block *block)
2566 struct dasd_ccw_req *cqr;
2568 if (list_empty(&block->ccw_queue))
2570 /* We allways begin with the first requests on the queue, as some
2571 * of previously started requests have to be enqueued on a
2572 * dasd_device again for error recovery.
2574 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
2575 if (cqr->status != DASD_CQR_FILLED)
2577 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
2578 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2579 cqr->status = DASD_CQR_FAILED;
2580 cqr->intrc = -EPERM;
2581 dasd_schedule_block_bh(block);
2584 /* Non-temporary stop condition will trigger fail fast */
2585 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
2586 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2587 (!dasd_eer_enabled(block->base))) {
2588 cqr->status = DASD_CQR_FAILED;
2589 dasd_schedule_block_bh(block);
2592 /* Don't try to start requests if device is stopped */
2593 if (block->base->stopped)
2596 /* just a fail safe check, should not happen */
2598 cqr->startdev = block->base;
2600 /* make sure that the requests we submit find their way back */
2601 cqr->callback = dasd_return_cqr_cb;
2603 dasd_add_request_tail(cqr);
2608 * Central dasd_block layer routine. Takes requests from the generic
2609 * block layer request queue, creates ccw requests, enqueues them on
2610 * a dasd_device and processes ccw requests that have been returned.
2612 static void dasd_block_tasklet(struct dasd_block *block)
2614 struct list_head final_queue;
2615 struct list_head *l, *n;
2616 struct dasd_ccw_req *cqr;
2618 atomic_set(&block->tasklet_scheduled, 0);
2619 INIT_LIST_HEAD(&final_queue);
2620 spin_lock(&block->queue_lock);
2621 /* Finish off requests on ccw queue */
2622 __dasd_process_block_ccw_queue(block, &final_queue);
2623 spin_unlock(&block->queue_lock);
2624 /* Now call the callback function of requests with final status */
2625 spin_lock_irq(&block->request_queue_lock);
2626 list_for_each_safe(l, n, &final_queue) {
2627 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2628 list_del_init(&cqr->blocklist);
2629 __dasd_cleanup_cqr(cqr);
2631 spin_lock(&block->queue_lock);
2632 /* Get new request from the block device request queue */
2633 __dasd_process_request_queue(block);
2634 /* Now check if the head of the ccw queue needs to be started. */
2635 __dasd_block_start_head(block);
2636 spin_unlock(&block->queue_lock);
2637 spin_unlock_irq(&block->request_queue_lock);
2638 if (waitqueue_active(&shutdown_waitq))
2639 wake_up(&shutdown_waitq);
2640 dasd_put_device(block->base);
2643 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2645 wake_up(&dasd_flush_wq);
2649 * Go through all request on the dasd_block request queue, cancel them
2650 * on the respective dasd_device, and return them to the generic
2653 static int dasd_flush_block_queue(struct dasd_block *block)
2655 struct dasd_ccw_req *cqr, *n;
2657 struct list_head flush_queue;
2659 INIT_LIST_HEAD(&flush_queue);
2660 spin_lock_bh(&block->queue_lock);
2663 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2664 /* if this request currently owned by a dasd_device cancel it */
2665 if (cqr->status >= DASD_CQR_QUEUED)
2666 rc = dasd_cancel_req(cqr);
2669 /* Rechain request (including erp chain) so it won't be
2670 * touched by the dasd_block_tasklet anymore.
2671 * Replace the callback so we notice when the request
2672 * is returned from the dasd_device layer.
2674 cqr->callback = _dasd_wake_block_flush_cb;
2675 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2676 list_move_tail(&cqr->blocklist, &flush_queue);
2678 /* moved more than one request - need to restart */
2681 spin_unlock_bh(&block->queue_lock);
2682 /* Now call the callback function of flushed requests */
2684 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
2685 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
2686 /* Process finished ERP request. */
2688 spin_lock_bh(&block->queue_lock);
2689 __dasd_process_erp(block->base, cqr);
2690 spin_unlock_bh(&block->queue_lock);
2691 /* restart list_for_xx loop since dasd_process_erp
2692 * might remove multiple elements */
2695 /* call the callback function */
2696 spin_lock_irq(&block->request_queue_lock);
2697 cqr->endclk = get_clock();
2698 list_del_init(&cqr->blocklist);
2699 __dasd_cleanup_cqr(cqr);
2700 spin_unlock_irq(&block->request_queue_lock);
2706 * Schedules a call to dasd_tasklet over the device tasklet.
2708 void dasd_schedule_block_bh(struct dasd_block *block)
2710 /* Protect against rescheduling. */
2711 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
2713 /* life cycle of block is bound to it's base device */
2714 dasd_get_device(block->base);
2715 tasklet_hi_schedule(&block->tasklet);
2720 * SECTION: external block device operations
2721 * (request queue handling, open, release, etc.)
2725 * Dasd request queue function. Called from ll_rw_blk.c
2727 static void do_dasd_request(struct request_queue *queue)
2729 struct dasd_block *block;
2731 block = queue->queuedata;
2732 spin_lock(&block->queue_lock);
2733 /* Get new request from the block device request queue */
2734 __dasd_process_request_queue(block);
2735 /* Now check if the head of the ccw queue needs to be started. */
2736 __dasd_block_start_head(block);
2737 spin_unlock(&block->queue_lock);
2741 * Allocate and initialize request queue and default I/O scheduler.
2743 static int dasd_alloc_queue(struct dasd_block *block)
2747 block->request_queue = blk_init_queue(do_dasd_request,
2748 &block->request_queue_lock);
2749 if (block->request_queue == NULL)
2752 block->request_queue->queuedata = block;
2754 elevator_exit(block->request_queue->elevator);
2755 block->request_queue->elevator = NULL;
2756 rc = elevator_init(block->request_queue, "deadline");
2758 blk_cleanup_queue(block->request_queue);
2765 * Allocate and initialize request queue.
2767 static void dasd_setup_queue(struct dasd_block *block)
2771 if (block->base->features & DASD_FEATURE_USERAW) {
2773 * the max_blocks value for raw_track access is 256
2774 * it is higher than the native ECKD value because we
2775 * only need one ccw per track
2776 * so the max_hw_sectors are
2777 * 2048 x 512B = 1024kB = 16 tracks
2781 max = block->base->discipline->max_blocks << block->s2b_shift;
2783 blk_queue_logical_block_size(block->request_queue,
2785 blk_queue_max_hw_sectors(block->request_queue, max);
2786 blk_queue_max_segments(block->request_queue, -1L);
2787 /* with page sized segments we can translate each segement into
2790 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
2791 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
2795 * Deactivate and free request queue.
2797 static void dasd_free_queue(struct dasd_block *block)
2799 if (block->request_queue) {
2800 blk_cleanup_queue(block->request_queue);
2801 block->request_queue = NULL;
2806 * Flush request on the request queue.
2808 static void dasd_flush_request_queue(struct dasd_block *block)
2810 struct request *req;
2812 if (!block->request_queue)
2815 spin_lock_irq(&block->request_queue_lock);
2816 while ((req = blk_fetch_request(block->request_queue)))
2817 __blk_end_request_all(req, -EIO);
2818 spin_unlock_irq(&block->request_queue_lock);
2821 static int dasd_open(struct block_device *bdev, fmode_t mode)
2823 struct dasd_device *base;
2826 base = dasd_device_from_gendisk(bdev->bd_disk);
2830 atomic_inc(&base->block->open_count);
2831 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
2836 if (!try_module_get(base->discipline->owner)) {
2841 if (dasd_probeonly) {
2842 dev_info(&base->cdev->dev,
2843 "Accessing the DASD failed because it is in "
2844 "probeonly mode\n");
2849 if (base->state <= DASD_STATE_BASIC) {
2850 DBF_DEV_EVENT(DBF_ERR, base, " %s",
2851 " Cannot open unrecognized device");
2856 if ((mode & FMODE_WRITE) &&
2857 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
2858 (base->features & DASD_FEATURE_READONLY))) {
2863 dasd_put_device(base);
2867 module_put(base->discipline->owner);
2869 atomic_dec(&base->block->open_count);
2870 dasd_put_device(base);
2874 static int dasd_release(struct gendisk *disk, fmode_t mode)
2876 struct dasd_device *base;
2878 base = dasd_device_from_gendisk(disk);
2882 atomic_dec(&base->block->open_count);
2883 module_put(base->discipline->owner);
2884 dasd_put_device(base);
2889 * Return disk geometry.
2891 static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
2893 struct dasd_device *base;
2895 base = dasd_device_from_gendisk(bdev->bd_disk);
2899 if (!base->discipline ||
2900 !base->discipline->fill_geometry) {
2901 dasd_put_device(base);
2904 base->discipline->fill_geometry(base->block, geo);
2905 geo->start = get_start_sect(bdev) >> base->block->s2b_shift;
2906 dasd_put_device(base);
2910 const struct block_device_operations
2911 dasd_device_operations = {
2912 .owner = THIS_MODULE,
2914 .release = dasd_release,
2915 .ioctl = dasd_ioctl,
2916 .compat_ioctl = dasd_ioctl,
2917 .getgeo = dasd_getgeo,
2920 /*******************************************************************************
2921 * end of block device operations
2927 #ifdef CONFIG_PROC_FS
2931 if (dasd_page_cache != NULL) {
2932 kmem_cache_destroy(dasd_page_cache);
2933 dasd_page_cache = NULL;
2935 dasd_gendisk_exit();
2937 if (dasd_debug_area != NULL) {
2938 debug_unregister(dasd_debug_area);
2939 dasd_debug_area = NULL;
2941 dasd_statistics_removeroot();
2945 * SECTION: common functions for ccw_driver use
2949 * Is the device read-only?
2950 * Note that this function does not report the setting of the
2951 * readonly device attribute, but how it is configured in z/VM.
2953 int dasd_device_is_ro(struct dasd_device *device)
2955 struct ccw_dev_id dev_id;
2956 struct diag210 diag_data;
2961 ccw_device_get_id(device->cdev, &dev_id);
2962 memset(&diag_data, 0, sizeof(diag_data));
2963 diag_data.vrdcdvno = dev_id.devno;
2964 diag_data.vrdclen = sizeof(diag_data);
2965 rc = diag210(&diag_data);
2966 if (rc == 0 || rc == 2) {
2967 return diag_data.vrdcvfla & 0x80;
2969 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
2974 EXPORT_SYMBOL_GPL(dasd_device_is_ro);
2976 static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
2978 struct ccw_device *cdev = data;
2981 ret = ccw_device_set_online(cdev);
2983 pr_warning("%s: Setting the DASD online failed with rc=%d\n",
2984 dev_name(&cdev->dev), ret);
2988 * Initial attempt at a probe function. this can be simplified once
2989 * the other detection code is gone.
2991 int dasd_generic_probe(struct ccw_device *cdev,
2992 struct dasd_discipline *discipline)
2996 ret = dasd_add_sysfs_files(cdev);
2998 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
2999 "dasd_generic_probe: could not add "
3003 cdev->handler = &dasd_int_handler;
3006 * Automatically online either all dasd devices (dasd_autodetect)
3007 * or all devices specified with dasd= parameters during
3010 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
3011 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
3012 async_schedule(dasd_generic_auto_online, cdev);
3017 * This will one day be called from a global not_oper handler.
3018 * It is also used by driver_unregister during module unload.
3020 void dasd_generic_remove(struct ccw_device *cdev)
3022 struct dasd_device *device;
3023 struct dasd_block *block;
3025 cdev->handler = NULL;
3027 dasd_remove_sysfs_files(cdev);
3028 device = dasd_device_from_cdev(cdev);
3031 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3032 /* Already doing offline processing */
3033 dasd_put_device(device);
3037 * This device is removed unconditionally. Set offline
3038 * flag to prevent dasd_open from opening it while it is
3039 * no quite down yet.
3041 dasd_set_target_state(device, DASD_STATE_NEW);
3042 /* dasd_delete_device destroys the device reference. */
3043 block = device->block;
3044 dasd_delete_device(device);
3046 * life cycle of block is bound to device, so delete it after
3047 * device was safely removed
3050 dasd_free_block(block);
3054 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
3055 * the device is detected for the first time and is supposed to be used
3056 * or the user has started activation through sysfs.
3058 int dasd_generic_set_online(struct ccw_device *cdev,
3059 struct dasd_discipline *base_discipline)
3061 struct dasd_discipline *discipline;
3062 struct dasd_device *device;
3065 /* first online clears initial online feature flag */
3066 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
3067 device = dasd_create_device(cdev);
3069 return PTR_ERR(device);
3071 discipline = base_discipline;
3072 if (device->features & DASD_FEATURE_USEDIAG) {
3073 if (!dasd_diag_discipline_pointer) {
3074 pr_warning("%s Setting the DASD online failed because "
3075 "of missing DIAG discipline\n",
3076 dev_name(&cdev->dev));
3077 dasd_delete_device(device);
3080 discipline = dasd_diag_discipline_pointer;
3082 if (!try_module_get(base_discipline->owner)) {
3083 dasd_delete_device(device);
3086 if (!try_module_get(discipline->owner)) {
3087 module_put(base_discipline->owner);
3088 dasd_delete_device(device);
3091 device->base_discipline = base_discipline;
3092 device->discipline = discipline;
3094 /* check_device will allocate block device if necessary */
3095 rc = discipline->check_device(device);
3097 pr_warning("%s Setting the DASD online with discipline %s "
3098 "failed with rc=%i\n",
3099 dev_name(&cdev->dev), discipline->name, rc);
3100 module_put(discipline->owner);
3101 module_put(base_discipline->owner);
3102 dasd_delete_device(device);
3106 dasd_set_target_state(device, DASD_STATE_ONLINE);
3107 if (device->state <= DASD_STATE_KNOWN) {
3108 pr_warning("%s Setting the DASD online failed because of a "
3109 "missing discipline\n", dev_name(&cdev->dev));
3111 dasd_set_target_state(device, DASD_STATE_NEW);
3113 dasd_free_block(device->block);
3114 dasd_delete_device(device);
3116 pr_debug("dasd_generic device %s found\n",
3117 dev_name(&cdev->dev));
3119 wait_event(dasd_init_waitq, _wait_for_device(device));
3121 dasd_put_device(device);
3125 int dasd_generic_set_offline(struct ccw_device *cdev)
3127 struct dasd_device *device;
3128 struct dasd_block *block;
3129 int max_count, open_count;
3131 device = dasd_device_from_cdev(cdev);
3133 return PTR_ERR(device);
3134 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3135 /* Already doing offline processing */
3136 dasd_put_device(device);
3140 * We must make sure that this device is currently not in use.
3141 * The open_count is increased for every opener, that includes
3142 * the blkdev_get in dasd_scan_partitions. We are only interested
3143 * in the other openers.
3145 if (device->block) {
3146 max_count = device->block->bdev ? 0 : -1;
3147 open_count = atomic_read(&device->block->open_count);
3148 if (open_count > max_count) {
3150 pr_warning("%s: The DASD cannot be set offline "
3151 "with open count %i\n",
3152 dev_name(&cdev->dev), open_count);
3154 pr_warning("%s: The DASD cannot be set offline "
3155 "while it is in use\n",
3156 dev_name(&cdev->dev));
3157 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3158 dasd_put_device(device);
3162 dasd_set_target_state(device, DASD_STATE_NEW);
3163 /* dasd_delete_device destroys the device reference. */
3164 block = device->block;
3165 dasd_delete_device(device);
3167 * life cycle of block is bound to device, so delete it after
3168 * device was safely removed
3171 dasd_free_block(block);
3175 int dasd_generic_last_path_gone(struct dasd_device *device)
3177 struct dasd_ccw_req *cqr;
3179 dev_warn(&device->cdev->dev, "No operational channel path is left "
3180 "for the device\n");
3181 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
3182 /* First of all call extended error reporting. */
3183 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3185 if (device->state < DASD_STATE_BASIC)
3187 /* Device is active. We want to keep it. */
3188 list_for_each_entry(cqr, &device->ccw_queue, devlist)
3189 if ((cqr->status == DASD_CQR_IN_IO) ||
3190 (cqr->status == DASD_CQR_CLEAR_PENDING)) {
3191 cqr->status = DASD_CQR_QUEUED;
3194 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
3195 dasd_device_clear_timer(device);
3196 dasd_schedule_device_bh(device);
3199 EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
3201 int dasd_generic_path_operational(struct dasd_device *device)
3203 dev_info(&device->cdev->dev, "A channel path to the device has become "
3205 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
3206 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
3207 if (device->stopped & DASD_UNRESUMED_PM) {
3208 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
3209 dasd_restore_device(device);
3212 dasd_schedule_device_bh(device);
3214 dasd_schedule_block_bh(device->block);
3217 EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
3219 int dasd_generic_notify(struct ccw_device *cdev, int event)
3221 struct dasd_device *device;
3224 device = dasd_device_from_cdev_locked(cdev);
3232 device->path_data.opm = 0;
3233 device->path_data.ppm = 0;
3234 device->path_data.npm = 0;
3235 ret = dasd_generic_last_path_gone(device);
3239 if (device->path_data.opm)
3240 ret = dasd_generic_path_operational(device);
3243 dasd_put_device(device);
3247 void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
3250 __u8 oldopm, eventlpm;
3251 struct dasd_device *device;
3253 device = dasd_device_from_cdev_locked(cdev);
3256 for (chp = 0; chp < 8; chp++) {
3257 eventlpm = 0x80 >> chp;
3258 if (path_event[chp] & PE_PATH_GONE) {
3259 oldopm = device->path_data.opm;
3260 device->path_data.opm &= ~eventlpm;
3261 device->path_data.ppm &= ~eventlpm;
3262 device->path_data.npm &= ~eventlpm;
3263 if (oldopm && !device->path_data.opm)
3264 dasd_generic_last_path_gone(device);
3266 if (path_event[chp] & PE_PATH_AVAILABLE) {
3267 device->path_data.opm &= ~eventlpm;
3268 device->path_data.ppm &= ~eventlpm;
3269 device->path_data.npm &= ~eventlpm;
3270 device->path_data.tbvpm |= eventlpm;
3271 dasd_schedule_device_bh(device);
3273 if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) {
3274 if (!(device->path_data.opm & eventlpm) &&
3275 !(device->path_data.tbvpm & eventlpm)) {
3277 * we can not establish a pathgroup on an
3278 * unavailable path, so trigger a path
3279 * verification first
3281 device->path_data.tbvpm |= eventlpm;
3282 dasd_schedule_device_bh(device);
3284 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3285 "Pathgroup re-established\n");
3286 if (device->discipline->kick_validate)
3287 device->discipline->kick_validate(device);
3290 dasd_put_device(device);
3292 EXPORT_SYMBOL_GPL(dasd_generic_path_event);
3294 int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
3296 if (!device->path_data.opm && lpm) {
3297 device->path_data.opm = lpm;
3298 dasd_generic_path_operational(device);
3300 device->path_data.opm |= lpm;
3303 EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
3306 int dasd_generic_pm_freeze(struct ccw_device *cdev)
3308 struct dasd_ccw_req *cqr, *n;
3310 struct list_head freeze_queue;
3311 struct dasd_device *device = dasd_device_from_cdev(cdev);
3314 return PTR_ERR(device);
3316 /* mark device as suspended */
3317 set_bit(DASD_FLAG_SUSPENDED, &device->flags);
3319 if (device->discipline->freeze)
3320 rc = device->discipline->freeze(device);
3322 /* disallow new I/O */
3323 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
3324 /* clear active requests */
3325 INIT_LIST_HEAD(&freeze_queue);
3326 spin_lock_irq(get_ccwdev_lock(cdev));
3328 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
3329 /* Check status and move request to flush_queue */
3330 if (cqr->status == DASD_CQR_IN_IO) {
3331 rc = device->discipline->term_IO(cqr);
3333 /* unable to terminate requeust */
3334 dev_err(&device->cdev->dev,
3335 "Unable to terminate request %p "
3336 "on suspend\n", cqr);
3337 spin_unlock_irq(get_ccwdev_lock(cdev));
3338 dasd_put_device(device);
3342 list_move_tail(&cqr->devlist, &freeze_queue);
3345 spin_unlock_irq(get_ccwdev_lock(cdev));
3347 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
3348 wait_event(dasd_flush_wq,
3349 (cqr->status != DASD_CQR_CLEAR_PENDING));
3350 if (cqr->status == DASD_CQR_CLEARED)
3351 cqr->status = DASD_CQR_QUEUED;
3353 /* move freeze_queue to start of the ccw_queue */
3354 spin_lock_irq(get_ccwdev_lock(cdev));
3355 list_splice_tail(&freeze_queue, &device->ccw_queue);
3356 spin_unlock_irq(get_ccwdev_lock(cdev));
3358 dasd_put_device(device);
3361 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
3363 int dasd_generic_restore_device(struct ccw_device *cdev)
3365 struct dasd_device *device = dasd_device_from_cdev(cdev);
3369 return PTR_ERR(device);
3371 /* allow new IO again */
3372 dasd_device_remove_stop_bits(device,
3373 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
3375 dasd_schedule_device_bh(device);
3378 * call discipline restore function
3379 * if device is stopped do nothing e.g. for disconnected devices
3381 if (device->discipline->restore && !(device->stopped))
3382 rc = device->discipline->restore(device);
3383 if (rc || device->stopped)
3385 * if the resume failed for the DASD we put it in
3386 * an UNRESUMED stop state
3388 device->stopped |= DASD_UNRESUMED_PM;
3391 dasd_schedule_block_bh(device->block);
3393 clear_bit(DASD_FLAG_SUSPENDED, &device->flags);
3394 dasd_put_device(device);
3397 EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
3399 static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
3401 int rdc_buffer_size,
3404 struct dasd_ccw_req *cqr;
3406 unsigned long *idaw;
3408 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
3411 /* internal error 13 - Allocating the RDC request failed*/
3412 dev_err(&device->cdev->dev,
3413 "An error occurred in the DASD device driver, "
3414 "reason=%s\n", "13");
3419 ccw->cmd_code = CCW_CMD_RDC;
3420 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
3421 idaw = (unsigned long *) (cqr->data);
3422 ccw->cda = (__u32)(addr_t) idaw;
3423 ccw->flags = CCW_FLAG_IDA;
3424 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
3426 ccw->cda = (__u32)(addr_t) rdc_buffer;
3430 ccw->count = rdc_buffer_size;
3431 cqr->startdev = device;
3432 cqr->memdev = device;
3433 cqr->expires = 10*HZ;
3435 cqr->buildclk = get_clock();
3436 cqr->status = DASD_CQR_FILLED;
3441 int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
3442 void *rdc_buffer, int rdc_buffer_size)
3445 struct dasd_ccw_req *cqr;
3447 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
3450 return PTR_ERR(cqr);
3452 ret = dasd_sleep_on(cqr);
3453 dasd_sfree_request(cqr, cqr->memdev);
3456 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
3459 * In command mode and transport mode we need to look for sense
3460 * data in different places. The sense data itself is allways
3461 * an array of 32 bytes, so we can unify the sense data access
3464 char *dasd_get_sense(struct irb *irb)
3466 struct tsb *tsb = NULL;
3469 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
3470 if (irb->scsw.tm.tcw)
3471 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
3473 if (tsb && tsb->length == 64 && tsb->flags)
3474 switch (tsb->flags & 0x07) {
3475 case 1: /* tsa_iostat */
3476 sense = tsb->tsa.iostat.sense;
3478 case 2: /* tsa_ddpc */
3479 sense = tsb->tsa.ddpc.sense;
3482 /* currently we don't use interrogate data */
3485 } else if (irb->esw.esw0.erw.cons) {
3490 EXPORT_SYMBOL_GPL(dasd_get_sense);
3492 static inline int _wait_for_empty_queues(struct dasd_device *device)
3495 return list_empty(&device->ccw_queue) &&
3496 list_empty(&device->block->ccw_queue);
3498 return list_empty(&device->ccw_queue);
3501 void dasd_generic_shutdown(struct ccw_device *cdev)
3503 struct dasd_device *device;
3505 device = dasd_device_from_cdev(cdev);
3510 dasd_schedule_block_bh(device->block);
3512 dasd_schedule_device_bh(device);
3514 wait_event(shutdown_waitq, _wait_for_empty_queues(device));
3516 EXPORT_SYMBOL_GPL(dasd_generic_shutdown);
3518 static int __init dasd_init(void)
3522 init_waitqueue_head(&dasd_init_waitq);
3523 init_waitqueue_head(&dasd_flush_wq);
3524 init_waitqueue_head(&generic_waitq);
3525 init_waitqueue_head(&shutdown_waitq);
3527 /* register 'common' DASD debug area, used for all DBF_XXX calls */
3528 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
3529 if (dasd_debug_area == NULL) {
3533 debug_register_view(dasd_debug_area, &debug_sprintf_view);
3534 debug_set_level(dasd_debug_area, DBF_WARNING);
3536 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
3538 dasd_diag_discipline_pointer = NULL;
3540 dasd_statistics_createroot();
3542 rc = dasd_devmap_init();
3545 rc = dasd_gendisk_init();
3551 rc = dasd_eer_init();
3554 #ifdef CONFIG_PROC_FS
3555 rc = dasd_proc_init();
3562 pr_info("The DASD device driver could not be initialized\n");
3567 module_init(dasd_init);
3568 module_exit(dasd_exit);
3570 EXPORT_SYMBOL(dasd_debug_area);
3571 EXPORT_SYMBOL(dasd_diag_discipline_pointer);
3573 EXPORT_SYMBOL(dasd_add_request_head);
3574 EXPORT_SYMBOL(dasd_add_request_tail);
3575 EXPORT_SYMBOL(dasd_cancel_req);
3576 EXPORT_SYMBOL(dasd_device_clear_timer);
3577 EXPORT_SYMBOL(dasd_block_clear_timer);
3578 EXPORT_SYMBOL(dasd_enable_device);
3579 EXPORT_SYMBOL(dasd_int_handler);
3580 EXPORT_SYMBOL(dasd_kfree_request);
3581 EXPORT_SYMBOL(dasd_kick_device);
3582 EXPORT_SYMBOL(dasd_kmalloc_request);
3583 EXPORT_SYMBOL(dasd_schedule_device_bh);
3584 EXPORT_SYMBOL(dasd_schedule_block_bh);
3585 EXPORT_SYMBOL(dasd_set_target_state);
3586 EXPORT_SYMBOL(dasd_device_set_timer);
3587 EXPORT_SYMBOL(dasd_block_set_timer);
3588 EXPORT_SYMBOL(dasd_sfree_request);
3589 EXPORT_SYMBOL(dasd_sleep_on);
3590 EXPORT_SYMBOL(dasd_sleep_on_immediatly);
3591 EXPORT_SYMBOL(dasd_sleep_on_interruptible);
3592 EXPORT_SYMBOL(dasd_smalloc_request);
3593 EXPORT_SYMBOL(dasd_start_IO);
3594 EXPORT_SYMBOL(dasd_term_IO);
3596 EXPORT_SYMBOL_GPL(dasd_generic_probe);
3597 EXPORT_SYMBOL_GPL(dasd_generic_remove);
3598 EXPORT_SYMBOL_GPL(dasd_generic_notify);
3599 EXPORT_SYMBOL_GPL(dasd_generic_set_online);
3600 EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
3601 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
3602 EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
3603 EXPORT_SYMBOL_GPL(dasd_alloc_block);
3604 EXPORT_SYMBOL_GPL(dasd_free_block);