2 * File...........: linux/drivers/s390/block/dasd.c
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/buffer_head.h>
21 #include <linux/hdreg.h>
22 #include <linux/async.h>
24 #include <asm/ccwdev.h>
25 #include <asm/ebcdic.h>
26 #include <asm/idals.h>
27 #include <asm/todclk.h>
31 #define PRINTK_HEADER "dasd:"
35 * SECTION: Constant definitions to be used within this file
37 #define DASD_CHANQ_MAX_SIZE 4
40 * SECTION: exported variables of dasd.c
42 debug_info_t *dasd_debug_area;
43 struct dasd_discipline *dasd_diag_discipline_pointer;
44 void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
46 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
47 MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
48 " Copyright 2000 IBM Corporation");
49 MODULE_SUPPORTED_DEVICE("dasd");
50 MODULE_LICENSE("GPL");
53 * SECTION: prototypes for static functions of dasd.c
55 static int dasd_alloc_queue(struct dasd_block *);
56 static void dasd_setup_queue(struct dasd_block *);
57 static void dasd_free_queue(struct dasd_block *);
58 static void dasd_flush_request_queue(struct dasd_block *);
59 static int dasd_flush_block_queue(struct dasd_block *);
60 static void dasd_device_tasklet(struct dasd_device *);
61 static void dasd_block_tasklet(struct dasd_block *);
62 static void do_kick_device(struct work_struct *);
63 static void do_restore_device(struct work_struct *);
64 static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
65 static void dasd_device_timeout(unsigned long);
66 static void dasd_block_timeout(unsigned long);
69 * SECTION: Operations on the device structure.
71 static wait_queue_head_t dasd_init_waitq;
72 static wait_queue_head_t dasd_flush_wq;
73 static wait_queue_head_t generic_waitq;
76 * Allocate memory for a new device structure.
78 struct dasd_device *dasd_alloc_device(void)
80 struct dasd_device *device;
82 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC);
84 return ERR_PTR(-ENOMEM);
86 /* Get two pages for normal block device operations. */
87 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
88 if (!device->ccw_mem) {
90 return ERR_PTR(-ENOMEM);
92 /* Get one page for error recovery. */
93 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
94 if (!device->erp_mem) {
95 free_pages((unsigned long) device->ccw_mem, 1);
97 return ERR_PTR(-ENOMEM);
100 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
101 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
102 spin_lock_init(&device->mem_lock);
103 atomic_set(&device->tasklet_scheduled, 0);
104 tasklet_init(&device->tasklet,
105 (void (*)(unsigned long)) dasd_device_tasklet,
106 (unsigned long) device);
107 INIT_LIST_HEAD(&device->ccw_queue);
108 init_timer(&device->timer);
109 device->timer.function = dasd_device_timeout;
110 device->timer.data = (unsigned long) device;
111 INIT_WORK(&device->kick_work, do_kick_device);
112 INIT_WORK(&device->restore_device, do_restore_device);
113 device->state = DASD_STATE_NEW;
114 device->target = DASD_STATE_NEW;
120 * Free memory of a device structure.
122 void dasd_free_device(struct dasd_device *device)
124 kfree(device->private);
125 free_page((unsigned long) device->erp_mem);
126 free_pages((unsigned long) device->ccw_mem, 1);
131 * Allocate memory for a new device structure.
133 struct dasd_block *dasd_alloc_block(void)
135 struct dasd_block *block;
137 block = kzalloc(sizeof(*block), GFP_ATOMIC);
139 return ERR_PTR(-ENOMEM);
140 /* open_count = 0 means device online but not in use */
141 atomic_set(&block->open_count, -1);
143 spin_lock_init(&block->request_queue_lock);
144 atomic_set(&block->tasklet_scheduled, 0);
145 tasklet_init(&block->tasklet,
146 (void (*)(unsigned long)) dasd_block_tasklet,
147 (unsigned long) block);
148 INIT_LIST_HEAD(&block->ccw_queue);
149 spin_lock_init(&block->queue_lock);
150 init_timer(&block->timer);
151 block->timer.function = dasd_block_timeout;
152 block->timer.data = (unsigned long) block;
158 * Free memory of a device structure.
160 void dasd_free_block(struct dasd_block *block)
166 * Make a new device known to the system.
168 static int dasd_state_new_to_known(struct dasd_device *device)
173 * As long as the device is not in state DASD_STATE_NEW we want to
174 * keep the reference count > 0.
176 dasd_get_device(device);
179 rc = dasd_alloc_queue(device->block);
181 dasd_put_device(device);
185 device->state = DASD_STATE_KNOWN;
190 * Let the system forget about a device.
192 static int dasd_state_known_to_new(struct dasd_device *device)
194 /* Disable extended error reporting for this device. */
195 dasd_eer_disable(device);
196 /* Forget the discipline information. */
197 if (device->discipline) {
198 if (device->discipline->uncheck_device)
199 device->discipline->uncheck_device(device);
200 module_put(device->discipline->owner);
202 device->discipline = NULL;
203 if (device->base_discipline)
204 module_put(device->base_discipline->owner);
205 device->base_discipline = NULL;
206 device->state = DASD_STATE_NEW;
209 dasd_free_queue(device->block);
211 /* Give up reference we took in dasd_state_new_to_known. */
212 dasd_put_device(device);
217 * Request the irq line for the device.
219 static int dasd_state_known_to_basic(struct dasd_device *device)
223 /* Allocate and register gendisk structure. */
225 rc = dasd_gendisk_alloc(device->block);
229 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
230 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1,
232 debug_register_view(device->debug_area, &debug_sprintf_view);
233 debug_set_level(device->debug_area, DBF_WARNING);
234 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
236 device->state = DASD_STATE_BASIC;
241 * Release the irq line for the device. Terminate any running i/o.
243 static int dasd_state_basic_to_known(struct dasd_device *device)
247 dasd_gendisk_free(device->block);
248 dasd_block_clear_timer(device->block);
250 rc = dasd_flush_device_queue(device);
253 dasd_device_clear_timer(device);
255 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
256 if (device->debug_area != NULL) {
257 debug_unregister(device->debug_area);
258 device->debug_area = NULL;
260 device->state = DASD_STATE_KNOWN;
265 * Do the initial analysis. The do_analysis function may return
266 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
267 * until the discipline decides to continue the startup sequence
268 * by calling the function dasd_change_state. The eckd disciplines
269 * uses this to start a ccw that detects the format. The completion
270 * interrupt for this detection ccw uses the kernel event daemon to
271 * trigger the call to dasd_change_state. All this is done in the
272 * discipline code, see dasd_eckd.c.
273 * After the analysis ccw is done (do_analysis returned 0) the block
275 * In case the analysis returns an error, the device setup is stopped
276 * (a fake disk was already added to allow formatting).
278 static int dasd_state_basic_to_ready(struct dasd_device *device)
281 struct dasd_block *block;
284 block = device->block;
285 /* make disk known with correct capacity */
287 if (block->base->discipline->do_analysis != NULL)
288 rc = block->base->discipline->do_analysis(block);
291 device->state = DASD_STATE_UNFMT;
294 dasd_setup_queue(block);
295 set_capacity(block->gdp,
296 block->blocks << block->s2b_shift);
297 device->state = DASD_STATE_READY;
298 rc = dasd_scan_partitions(block);
300 device->state = DASD_STATE_BASIC;
302 device->state = DASD_STATE_READY;
308 * Remove device from block device layer. Destroy dirty buffers.
309 * Forget format information. Check if the target level is basic
310 * and if it is create fake disk for formatting.
312 static int dasd_state_ready_to_basic(struct dasd_device *device)
316 device->state = DASD_STATE_BASIC;
318 struct dasd_block *block = device->block;
319 rc = dasd_flush_block_queue(block);
321 device->state = DASD_STATE_READY;
324 dasd_destroy_partitions(block);
325 dasd_flush_request_queue(block);
328 block->s2b_shift = 0;
336 static int dasd_state_unfmt_to_basic(struct dasd_device *device)
338 device->state = DASD_STATE_BASIC;
343 * Make the device online and schedule the bottom half to start
344 * the requeueing of requests from the linux request queue to the
348 dasd_state_ready_to_online(struct dasd_device * device)
351 struct gendisk *disk;
352 struct disk_part_iter piter;
353 struct hd_struct *part;
355 if (device->discipline->ready_to_online) {
356 rc = device->discipline->ready_to_online(device);
360 device->state = DASD_STATE_ONLINE;
362 dasd_schedule_block_bh(device->block);
363 disk = device->block->bdev->bd_disk;
364 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
365 while ((part = disk_part_iter_next(&piter)))
366 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
367 disk_part_iter_exit(&piter);
373 * Stop the requeueing of requests again.
375 static int dasd_state_online_to_ready(struct dasd_device *device)
378 struct gendisk *disk;
379 struct disk_part_iter piter;
380 struct hd_struct *part;
382 if (device->discipline->online_to_ready) {
383 rc = device->discipline->online_to_ready(device);
387 device->state = DASD_STATE_READY;
389 disk = device->block->bdev->bd_disk;
390 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
391 while ((part = disk_part_iter_next(&piter)))
392 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
393 disk_part_iter_exit(&piter);
399 * Device startup state changes.
401 static int dasd_increase_state(struct dasd_device *device)
406 if (device->state == DASD_STATE_NEW &&
407 device->target >= DASD_STATE_KNOWN)
408 rc = dasd_state_new_to_known(device);
411 device->state == DASD_STATE_KNOWN &&
412 device->target >= DASD_STATE_BASIC)
413 rc = dasd_state_known_to_basic(device);
416 device->state == DASD_STATE_BASIC &&
417 device->target >= DASD_STATE_READY)
418 rc = dasd_state_basic_to_ready(device);
421 device->state == DASD_STATE_UNFMT &&
422 device->target > DASD_STATE_UNFMT)
426 device->state == DASD_STATE_READY &&
427 device->target >= DASD_STATE_ONLINE)
428 rc = dasd_state_ready_to_online(device);
434 * Device shutdown state changes.
436 static int dasd_decrease_state(struct dasd_device *device)
441 if (device->state == DASD_STATE_ONLINE &&
442 device->target <= DASD_STATE_READY)
443 rc = dasd_state_online_to_ready(device);
446 device->state == DASD_STATE_READY &&
447 device->target <= DASD_STATE_BASIC)
448 rc = dasd_state_ready_to_basic(device);
451 device->state == DASD_STATE_UNFMT &&
452 device->target <= DASD_STATE_BASIC)
453 rc = dasd_state_unfmt_to_basic(device);
456 device->state == DASD_STATE_BASIC &&
457 device->target <= DASD_STATE_KNOWN)
458 rc = dasd_state_basic_to_known(device);
461 device->state == DASD_STATE_KNOWN &&
462 device->target <= DASD_STATE_NEW)
463 rc = dasd_state_known_to_new(device);
469 * This is the main startup/shutdown routine.
471 static void dasd_change_state(struct dasd_device *device)
475 if (device->state == device->target)
476 /* Already where we want to go today... */
478 if (device->state < device->target)
479 rc = dasd_increase_state(device);
481 rc = dasd_decrease_state(device);
482 if (rc && rc != -EAGAIN)
483 device->target = device->state;
485 if (device->state == device->target) {
486 wake_up(&dasd_init_waitq);
487 dasd_put_device(device);
490 /* let user-space know that the device status changed */
491 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
495 * Kick starter for devices that did not complete the startup/shutdown
496 * procedure or were sleeping because of a pending state.
497 * dasd_kick_device will schedule a call do do_kick_device to the kernel
500 static void do_kick_device(struct work_struct *work)
502 struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
503 dasd_change_state(device);
504 dasd_schedule_device_bh(device);
505 dasd_put_device(device);
508 void dasd_kick_device(struct dasd_device *device)
510 dasd_get_device(device);
511 /* queue call to dasd_kick_device to the kernel event daemon. */
512 schedule_work(&device->kick_work);
516 * dasd_restore_device will schedule a call do do_restore_device to the kernel
519 static void do_restore_device(struct work_struct *work)
521 struct dasd_device *device = container_of(work, struct dasd_device,
523 device->cdev->drv->restore(device->cdev);
524 dasd_put_device(device);
527 void dasd_restore_device(struct dasd_device *device)
529 dasd_get_device(device);
530 /* queue call to dasd_restore_device to the kernel event daemon. */
531 schedule_work(&device->restore_device);
535 * Set the target state for a device and starts the state change.
537 void dasd_set_target_state(struct dasd_device *device, int target)
539 dasd_get_device(device);
540 /* If we are in probeonly mode stop at DASD_STATE_READY. */
541 if (dasd_probeonly && target > DASD_STATE_READY)
542 target = DASD_STATE_READY;
543 if (device->target != target) {
544 if (device->state == target) {
545 wake_up(&dasd_init_waitq);
546 dasd_put_device(device);
548 device->target = target;
550 if (device->state != device->target)
551 dasd_change_state(device);
555 * Enable devices with device numbers in [from..to].
557 static inline int _wait_for_device(struct dasd_device *device)
559 return (device->state == device->target);
562 void dasd_enable_device(struct dasd_device *device)
564 dasd_set_target_state(device, DASD_STATE_ONLINE);
565 if (device->state <= DASD_STATE_KNOWN)
566 /* No discipline for device found. */
567 dasd_set_target_state(device, DASD_STATE_NEW);
568 /* Now wait for the devices to come up. */
569 wait_event(dasd_init_waitq, _wait_for_device(device));
573 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
575 #ifdef CONFIG_DASD_PROFILE
577 struct dasd_profile_info_t dasd_global_profile;
578 unsigned int dasd_profile_level = DASD_PROFILE_OFF;
581 * Increments counter in global and local profiling structures.
583 #define dasd_profile_counter(value, counter, block) \
586 for (index = 0; index < 31 && value >> (2+index); index++); \
587 dasd_global_profile.counter[index]++; \
588 block->profile.counter[index]++; \
592 * Add profiling information for cqr before execution.
594 static void dasd_profile_start(struct dasd_block *block,
595 struct dasd_ccw_req *cqr,
599 unsigned int counter;
601 if (dasd_profile_level != DASD_PROFILE_ON)
604 /* count the length of the chanq for statistics */
606 list_for_each(l, &block->ccw_queue)
609 dasd_global_profile.dasd_io_nr_req[counter]++;
610 block->profile.dasd_io_nr_req[counter]++;
614 * Add profiling information for cqr after execution.
616 static void dasd_profile_end(struct dasd_block *block,
617 struct dasd_ccw_req *cqr,
620 long strtime, irqtime, endtime, tottime; /* in microseconds */
621 long tottimeps, sectors;
623 if (dasd_profile_level != DASD_PROFILE_ON)
626 sectors = blk_rq_sectors(req);
627 if (!cqr->buildclk || !cqr->startclk ||
628 !cqr->stopclk || !cqr->endclk ||
632 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
633 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
634 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
635 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
636 tottimeps = tottime / sectors;
638 if (!dasd_global_profile.dasd_io_reqs)
639 memset(&dasd_global_profile, 0,
640 sizeof(struct dasd_profile_info_t));
641 dasd_global_profile.dasd_io_reqs++;
642 dasd_global_profile.dasd_io_sects += sectors;
644 if (!block->profile.dasd_io_reqs)
645 memset(&block->profile, 0,
646 sizeof(struct dasd_profile_info_t));
647 block->profile.dasd_io_reqs++;
648 block->profile.dasd_io_sects += sectors;
650 dasd_profile_counter(sectors, dasd_io_secs, block);
651 dasd_profile_counter(tottime, dasd_io_times, block);
652 dasd_profile_counter(tottimeps, dasd_io_timps, block);
653 dasd_profile_counter(strtime, dasd_io_time1, block);
654 dasd_profile_counter(irqtime, dasd_io_time2, block);
655 dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, block);
656 dasd_profile_counter(endtime, dasd_io_time3, block);
659 #define dasd_profile_start(block, cqr, req) do {} while (0)
660 #define dasd_profile_end(block, cqr, req) do {} while (0)
661 #endif /* CONFIG_DASD_PROFILE */
664 * Allocate memory for a channel program with 'cplength' channel
665 * command words and 'datasize' additional space. There are two
666 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
667 * memory and 2) dasd_smalloc_request uses the static ccw memory
668 * that gets allocated for each device.
670 struct dasd_ccw_req *dasd_kmalloc_request(char *magic, int cplength,
672 struct dasd_device *device)
674 struct dasd_ccw_req *cqr;
677 BUG_ON( magic == NULL || datasize > PAGE_SIZE ||
678 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
680 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
682 return ERR_PTR(-ENOMEM);
685 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
686 GFP_ATOMIC | GFP_DMA);
687 if (cqr->cpaddr == NULL) {
689 return ERR_PTR(-ENOMEM);
694 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
695 if (cqr->data == NULL) {
698 return ERR_PTR(-ENOMEM);
701 strncpy((char *) &cqr->magic, magic, 4);
702 ASCEBC((char *) &cqr->magic, 4);
703 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
704 dasd_get_device(device);
708 struct dasd_ccw_req *dasd_smalloc_request(char *magic, int cplength,
710 struct dasd_device *device)
713 struct dasd_ccw_req *cqr;
718 BUG_ON( magic == NULL || datasize > PAGE_SIZE ||
719 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
721 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
723 size += cplength * sizeof(struct ccw1);
726 spin_lock_irqsave(&device->mem_lock, flags);
727 cqr = (struct dasd_ccw_req *)
728 dasd_alloc_chunk(&device->ccw_chunks, size);
729 spin_unlock_irqrestore(&device->mem_lock, flags);
731 return ERR_PTR(-ENOMEM);
732 memset(cqr, 0, sizeof(struct dasd_ccw_req));
733 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
736 cqr->cpaddr = (struct ccw1 *) data;
737 data += cplength*sizeof(struct ccw1);
738 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
743 memset(cqr->data, 0, datasize);
745 strncpy((char *) &cqr->magic, magic, 4);
746 ASCEBC((char *) &cqr->magic, 4);
747 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
748 dasd_get_device(device);
753 * Free memory of a channel program. This function needs to free all the
754 * idal lists that might have been created by dasd_set_cda and the
755 * struct dasd_ccw_req itself.
757 void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
762 /* Clear any idals used for the request. */
765 clear_normalized_cda(ccw);
766 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
771 dasd_put_device(device);
774 void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
778 spin_lock_irqsave(&device->mem_lock, flags);
779 dasd_free_chunk(&device->ccw_chunks, cqr);
780 spin_unlock_irqrestore(&device->mem_lock, flags);
781 dasd_put_device(device);
785 * Check discipline magic in cqr.
787 static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
789 struct dasd_device *device;
793 device = cqr->startdev;
794 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
795 DBF_DEV_EVENT(DBF_WARNING, device,
796 " dasd_ccw_req 0x%08x magic doesn't match"
797 " discipline 0x%08x",
799 *(unsigned int *) device->discipline->name);
806 * Terminate the current i/o and set the request to clear_pending.
807 * Timer keeps device runnig.
808 * ccw_device_clear can fail if the i/o subsystem
811 int dasd_term_IO(struct dasd_ccw_req *cqr)
813 struct dasd_device *device;
815 char errorstring[ERRORLENGTH];
818 rc = dasd_check_cqr(cqr);
822 device = (struct dasd_device *) cqr->startdev;
823 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
824 rc = ccw_device_clear(device->cdev, (long) cqr);
826 case 0: /* termination successful */
828 cqr->status = DASD_CQR_CLEAR_PENDING;
829 cqr->stopclk = get_clock();
831 DBF_DEV_EVENT(DBF_DEBUG, device,
832 "terminate cqr %p successful",
836 DBF_DEV_EVENT(DBF_ERR, device, "%s",
837 "device gone, retry");
840 DBF_DEV_EVENT(DBF_ERR, device, "%s",
845 DBF_DEV_EVENT(DBF_ERR, device, "%s",
846 "device busy, retry later");
849 /* internal error 10 - unknown rc*/
850 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
851 dev_err(&device->cdev->dev, "An error occurred in the "
852 "DASD device driver, reason=%s\n", errorstring);
858 dasd_schedule_device_bh(device);
863 * Start the i/o. This start_IO can fail if the channel is really busy.
864 * In that case set up a timer to start the request later.
866 int dasd_start_IO(struct dasd_ccw_req *cqr)
868 struct dasd_device *device;
870 char errorstring[ERRORLENGTH];
873 rc = dasd_check_cqr(cqr);
878 device = (struct dasd_device *) cqr->startdev;
879 if (cqr->retries < 0) {
880 /* internal error 14 - start_IO run out of retries */
881 sprintf(errorstring, "14 %p", cqr);
882 dev_err(&device->cdev->dev, "An error occurred in the DASD "
883 "device driver, reason=%s\n", errorstring);
884 cqr->status = DASD_CQR_ERROR;
887 cqr->startclk = get_clock();
888 cqr->starttime = jiffies;
890 if (cqr->cpmode == 1) {
891 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
892 (long) cqr, cqr->lpm);
894 rc = ccw_device_start(device->cdev, cqr->cpaddr,
895 (long) cqr, cqr->lpm, 0);
899 cqr->status = DASD_CQR_IN_IO;
900 DBF_DEV_EVENT(DBF_DEBUG, device,
901 "start_IO: request %p started successful",
905 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
906 "start_IO: device busy, retry later");
909 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
910 "start_IO: request timeout, retry later");
913 /* -EACCES indicates that the request used only a
914 * subset of the available pathes and all these
916 * Do a retry with all available pathes.
918 cqr->lpm = LPM_ANYPATH;
919 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
920 "start_IO: selected pathes gone,"
921 " retry on all pathes");
924 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
925 "start_IO: -ENODEV device gone, retry");
928 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
929 "start_IO: -EIO device gone, retry");
932 /* most likely caused in power management context */
933 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
934 "start_IO: -EINVAL device currently "
938 /* internal error 11 - unknown rc */
939 snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
940 dev_err(&device->cdev->dev,
941 "An error occurred in the DASD device driver, "
942 "reason=%s\n", errorstring);
951 * Timeout function for dasd devices. This is used for different purposes
952 * 1) missing interrupt handler for normal operation
953 * 2) delayed start of request where start_IO failed with -EBUSY
954 * 3) timeout for missing state change interrupts
955 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
956 * DASD_CQR_QUEUED for 2) and 3).
958 static void dasd_device_timeout(unsigned long ptr)
961 struct dasd_device *device;
963 device = (struct dasd_device *) ptr;
964 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
965 /* re-activate request queue */
966 device->stopped &= ~DASD_STOPPED_PENDING;
967 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
968 dasd_schedule_device_bh(device);
972 * Setup timeout for a device in jiffies.
974 void dasd_device_set_timer(struct dasd_device *device, int expires)
977 del_timer(&device->timer);
979 mod_timer(&device->timer, jiffies + expires);
983 * Clear timeout for a device.
985 void dasd_device_clear_timer(struct dasd_device *device)
987 del_timer(&device->timer);
990 static void dasd_handle_killed_request(struct ccw_device *cdev,
991 unsigned long intparm)
993 struct dasd_ccw_req *cqr;
994 struct dasd_device *device;
998 cqr = (struct dasd_ccw_req *) intparm;
999 if (cqr->status != DASD_CQR_IN_IO) {
1000 DBF_EVENT(DBF_DEBUG,
1001 "invalid status in handle_killed_request: "
1002 "bus_id %s, status %02x",
1003 dev_name(&cdev->dev), cqr->status);
1007 device = (struct dasd_device *) cqr->startdev;
1008 if (device == NULL ||
1009 device != dasd_device_from_cdev_locked(cdev) ||
1010 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
1011 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid device in request: "
1012 "bus_id %s", dev_name(&cdev->dev));
1016 /* Schedule request to be retried. */
1017 cqr->status = DASD_CQR_QUEUED;
1019 dasd_device_clear_timer(device);
1020 dasd_schedule_device_bh(device);
1021 dasd_put_device(device);
1024 void dasd_generic_handle_state_change(struct dasd_device *device)
1026 /* First of all start sense subsystem status request. */
1027 dasd_eer_snss(device);
1029 device->stopped &= ~DASD_STOPPED_PENDING;
1030 dasd_schedule_device_bh(device);
1032 dasd_schedule_block_bh(device->block);
1036 * Interrupt handler for "normal" ssch-io based dasd devices.
1038 void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1041 struct dasd_ccw_req *cqr, *next;
1042 struct dasd_device *device;
1043 unsigned long long now;
1047 switch (PTR_ERR(irb)) {
1051 DBF_EVENT(DBF_WARNING, "%s(%s): request timed out\n",
1052 __func__, dev_name(&cdev->dev));
1055 DBF_EVENT(DBF_WARNING, "%s(%s): unknown error %ld\n",
1056 __func__, dev_name(&cdev->dev), PTR_ERR(irb));
1058 dasd_handle_killed_request(cdev, intparm);
1064 /* check for unsolicited interrupts */
1065 cqr = (struct dasd_ccw_req *) intparm;
1066 if (!cqr || ((scsw_cc(&irb->scsw) == 1) &&
1067 (scsw_fctl(&irb->scsw) & SCSW_FCTL_START_FUNC) &&
1068 (scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))) {
1069 if (cqr && cqr->status == DASD_CQR_IN_IO)
1070 cqr->status = DASD_CQR_QUEUED;
1071 device = dasd_device_from_cdev_locked(cdev);
1072 if (!IS_ERR(device)) {
1073 dasd_device_clear_timer(device);
1074 device->discipline->handle_unsolicited_interrupt(device,
1076 dasd_put_device(device);
1081 device = (struct dasd_device *) cqr->startdev;
1083 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
1084 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid device in request: "
1085 "bus_id %s", dev_name(&cdev->dev));
1089 /* Check for clear pending */
1090 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
1091 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
1092 cqr->status = DASD_CQR_CLEARED;
1093 dasd_device_clear_timer(device);
1094 wake_up(&dasd_flush_wq);
1095 dasd_schedule_device_bh(device);
1099 /* check status - the request might have been killed by dyn detach */
1100 if (cqr->status != DASD_CQR_IN_IO) {
1101 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1102 "status %02x", dev_name(&cdev->dev), cqr->status);
1108 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1109 scsw_cstat(&irb->scsw) == 0) {
1110 /* request was completed successfully */
1111 cqr->status = DASD_CQR_SUCCESS;
1113 /* Start first request on queue if possible -> fast_io. */
1114 if (cqr->devlist.next != &device->ccw_queue) {
1115 next = list_entry(cqr->devlist.next,
1116 struct dasd_ccw_req, devlist);
1118 } else { /* error */
1119 memcpy(&cqr->irb, irb, sizeof(struct irb));
1120 /* log sense for every failed I/O to s390 debugfeature */
1121 dasd_log_sense_dbf(cqr, irb);
1122 if (device->features & DASD_FEATURE_ERPLOG) {
1123 dasd_log_sense(cqr, irb);
1127 * If we don't want complex ERP for this request, then just
1128 * reset this and retry it in the fastpath
1130 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
1132 if (cqr->lpm == LPM_ANYPATH)
1133 DBF_DEV_EVENT(DBF_DEBUG, device,
1134 "default ERP in fastpath "
1135 "(%i retries left)",
1137 cqr->lpm = LPM_ANYPATH;
1138 cqr->status = DASD_CQR_QUEUED;
1141 cqr->status = DASD_CQR_ERROR;
1143 if (next && (next->status == DASD_CQR_QUEUED) &&
1144 (!device->stopped)) {
1145 if (device->discipline->start_IO(next) == 0)
1146 expires = next->expires;
1149 dasd_device_set_timer(device, expires);
1151 dasd_device_clear_timer(device);
1152 dasd_schedule_device_bh(device);
1156 * If we have an error on a dasd_block layer request then we cancel
1157 * and return all further requests from the same dasd_block as well.
1159 static void __dasd_device_recovery(struct dasd_device *device,
1160 struct dasd_ccw_req *ref_cqr)
1162 struct list_head *l, *n;
1163 struct dasd_ccw_req *cqr;
1166 * only requeue request that came from the dasd_block layer
1168 if (!ref_cqr->block)
1171 list_for_each_safe(l, n, &device->ccw_queue) {
1172 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1173 if (cqr->status == DASD_CQR_QUEUED &&
1174 ref_cqr->block == cqr->block) {
1175 cqr->status = DASD_CQR_CLEARED;
1181 * Remove those ccw requests from the queue that need to be returned
1182 * to the upper layer.
1184 static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1185 struct list_head *final_queue)
1187 struct list_head *l, *n;
1188 struct dasd_ccw_req *cqr;
1190 /* Process request with final status. */
1191 list_for_each_safe(l, n, &device->ccw_queue) {
1192 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1194 /* Stop list processing at the first non-final request. */
1195 if (cqr->status == DASD_CQR_QUEUED ||
1196 cqr->status == DASD_CQR_IN_IO ||
1197 cqr->status == DASD_CQR_CLEAR_PENDING)
1199 if (cqr->status == DASD_CQR_ERROR) {
1200 __dasd_device_recovery(device, cqr);
1202 /* Rechain finished requests to final queue */
1203 list_move_tail(&cqr->devlist, final_queue);
1208 * the cqrs from the final queue are returned to the upper layer
1209 * by setting a dasd_block state and calling the callback function
1211 static void __dasd_device_process_final_queue(struct dasd_device *device,
1212 struct list_head *final_queue)
1214 struct list_head *l, *n;
1215 struct dasd_ccw_req *cqr;
1216 struct dasd_block *block;
1217 void (*callback)(struct dasd_ccw_req *, void *data);
1218 void *callback_data;
1219 char errorstring[ERRORLENGTH];
1221 list_for_each_safe(l, n, final_queue) {
1222 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1223 list_del_init(&cqr->devlist);
1225 callback = cqr->callback;
1226 callback_data = cqr->callback_data;
1228 spin_lock_bh(&block->queue_lock);
1229 switch (cqr->status) {
1230 case DASD_CQR_SUCCESS:
1231 cqr->status = DASD_CQR_DONE;
1233 case DASD_CQR_ERROR:
1234 cqr->status = DASD_CQR_NEED_ERP;
1236 case DASD_CQR_CLEARED:
1237 cqr->status = DASD_CQR_TERMINATED;
1240 /* internal error 12 - wrong cqr status*/
1241 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1242 dev_err(&device->cdev->dev,
1243 "An error occurred in the DASD device driver, "
1244 "reason=%s\n", errorstring);
1247 if (cqr->callback != NULL)
1248 (callback)(cqr, callback_data);
1250 spin_unlock_bh(&block->queue_lock);
1255 * Take a look at the first request on the ccw queue and check
1256 * if it reached its expire time. If so, terminate the IO.
1258 static void __dasd_device_check_expire(struct dasd_device *device)
1260 struct dasd_ccw_req *cqr;
1262 if (list_empty(&device->ccw_queue))
1264 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1265 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1266 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
1267 if (device->discipline->term_IO(cqr) != 0) {
1268 /* Hmpf, try again in 5 sec */
1269 dev_err(&device->cdev->dev,
1270 "cqr %p timed out (%is) but cannot be "
1271 "ended, retrying in 5 s\n",
1272 cqr, (cqr->expires/HZ));
1273 cqr->expires += 5*HZ;
1274 dasd_device_set_timer(device, 5*HZ);
1276 dev_err(&device->cdev->dev,
1277 "cqr %p timed out (%is), %i retries "
1278 "remaining\n", cqr, (cqr->expires/HZ),
1285 * Take a look at the first request on the ccw queue and check
1286 * if it needs to be started.
1288 static void __dasd_device_start_head(struct dasd_device *device)
1290 struct dasd_ccw_req *cqr;
1293 if (list_empty(&device->ccw_queue))
1295 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1296 if (cqr->status != DASD_CQR_QUEUED)
1298 /* when device is stopped, return request to previous layer */
1299 if (device->stopped) {
1300 cqr->status = DASD_CQR_CLEARED;
1301 dasd_schedule_device_bh(device);
1305 rc = device->discipline->start_IO(cqr);
1307 dasd_device_set_timer(device, cqr->expires);
1308 else if (rc == -EACCES) {
1309 dasd_schedule_device_bh(device);
1311 /* Hmpf, try again in 1/2 sec */
1312 dasd_device_set_timer(device, 50);
1316 * Go through all request on the dasd_device request queue,
1317 * terminate them on the cdev if necessary, and return them to the
1318 * submitting layer via callback.
1320 * Make sure that all 'submitting layers' still exist when
1321 * this function is called!. In other words, when 'device' is a base
1322 * device then all block layer requests must have been removed before
1323 * via dasd_flush_block_queue.
1325 int dasd_flush_device_queue(struct dasd_device *device)
1327 struct dasd_ccw_req *cqr, *n;
1329 struct list_head flush_queue;
1331 INIT_LIST_HEAD(&flush_queue);
1332 spin_lock_irq(get_ccwdev_lock(device->cdev));
1334 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
1335 /* Check status and move request to flush_queue */
1336 switch (cqr->status) {
1337 case DASD_CQR_IN_IO:
1338 rc = device->discipline->term_IO(cqr);
1340 /* unable to terminate requeust */
1341 dev_err(&device->cdev->dev,
1342 "Flushing the DASD request queue "
1343 "failed for request %p\n", cqr);
1344 /* stop flush processing */
1348 case DASD_CQR_QUEUED:
1349 cqr->stopclk = get_clock();
1350 cqr->status = DASD_CQR_CLEARED;
1352 default: /* no need to modify the others */
1355 list_move_tail(&cqr->devlist, &flush_queue);
1358 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1360 * After this point all requests must be in state CLEAR_PENDING,
1361 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
1362 * one of the others.
1364 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
1365 wait_event(dasd_flush_wq,
1366 (cqr->status != DASD_CQR_CLEAR_PENDING));
1368 * Now set each request back to TERMINATED, DONE or NEED_ERP
1369 * and call the callback function of flushed requests
1371 __dasd_device_process_final_queue(device, &flush_queue);
1376 * Acquire the device lock and process queues for the device.
1378 static void dasd_device_tasklet(struct dasd_device *device)
1380 struct list_head final_queue;
1382 atomic_set (&device->tasklet_scheduled, 0);
1383 INIT_LIST_HEAD(&final_queue);
1384 spin_lock_irq(get_ccwdev_lock(device->cdev));
1385 /* Check expire time of first request on the ccw queue. */
1386 __dasd_device_check_expire(device);
1387 /* find final requests on ccw queue */
1388 __dasd_device_process_ccw_queue(device, &final_queue);
1389 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1390 /* Now call the callback function of requests with final status */
1391 __dasd_device_process_final_queue(device, &final_queue);
1392 spin_lock_irq(get_ccwdev_lock(device->cdev));
1393 /* Now check if the head of the ccw queue needs to be started. */
1394 __dasd_device_start_head(device);
1395 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1396 dasd_put_device(device);
1400 * Schedules a call to dasd_tasklet over the device tasklet.
1402 void dasd_schedule_device_bh(struct dasd_device *device)
1404 /* Protect against rescheduling. */
1405 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
1407 dasd_get_device(device);
1408 tasklet_hi_schedule(&device->tasklet);
1412 * Queue a request to the head of the device ccw_queue.
1413 * Start the I/O if possible.
1415 void dasd_add_request_head(struct dasd_ccw_req *cqr)
1417 struct dasd_device *device;
1418 unsigned long flags;
1420 device = cqr->startdev;
1421 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1422 cqr->status = DASD_CQR_QUEUED;
1423 list_add(&cqr->devlist, &device->ccw_queue);
1424 /* let the bh start the request to keep them in order */
1425 dasd_schedule_device_bh(device);
1426 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1430 * Queue a request to the tail of the device ccw_queue.
1431 * Start the I/O if possible.
1433 void dasd_add_request_tail(struct dasd_ccw_req *cqr)
1435 struct dasd_device *device;
1436 unsigned long flags;
1438 device = cqr->startdev;
1439 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1440 cqr->status = DASD_CQR_QUEUED;
1441 list_add_tail(&cqr->devlist, &device->ccw_queue);
1442 /* let the bh start the request to keep them in order */
1443 dasd_schedule_device_bh(device);
1444 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1448 * Wakeup helper for the 'sleep_on' functions.
1450 static void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
1452 wake_up((wait_queue_head_t *) data);
1455 static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
1457 struct dasd_device *device;
1460 device = cqr->startdev;
1461 spin_lock_irq(get_ccwdev_lock(device->cdev));
1462 rc = ((cqr->status == DASD_CQR_DONE ||
1463 cqr->status == DASD_CQR_NEED_ERP ||
1464 cqr->status == DASD_CQR_TERMINATED) &&
1465 list_empty(&cqr->devlist));
1466 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1471 * Queue a request to the tail of the device ccw_queue and wait for
1474 int dasd_sleep_on(struct dasd_ccw_req *cqr)
1476 struct dasd_device *device;
1479 device = cqr->startdev;
1481 cqr->callback = dasd_wakeup_cb;
1482 cqr->callback_data = (void *) &generic_waitq;
1483 dasd_add_request_tail(cqr);
1484 wait_event(generic_waitq, _wait_for_wakeup(cqr));
1486 if (cqr->status == DASD_CQR_DONE)
1488 else if (cqr->intrc)
1496 * Queue a request to the tail of the device ccw_queue and wait
1497 * interruptible for it's completion.
1499 int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
1501 struct dasd_device *device;
1504 device = cqr->startdev;
1505 cqr->callback = dasd_wakeup_cb;
1506 cqr->callback_data = (void *) &generic_waitq;
1507 dasd_add_request_tail(cqr);
1508 rc = wait_event_interruptible(generic_waitq, _wait_for_wakeup(cqr));
1509 if (rc == -ERESTARTSYS) {
1510 dasd_cancel_req(cqr);
1511 /* wait (non-interruptible) for final status */
1512 wait_event(generic_waitq, _wait_for_wakeup(cqr));
1516 if (cqr->status == DASD_CQR_DONE)
1518 else if (cqr->intrc)
1526 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
1527 * for eckd devices) the currently running request has to be terminated
1528 * and be put back to status queued, before the special request is added
1529 * to the head of the queue. Then the special request is waited on normally.
1531 static inline int _dasd_term_running_cqr(struct dasd_device *device)
1533 struct dasd_ccw_req *cqr;
1535 if (list_empty(&device->ccw_queue))
1537 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1538 return device->discipline->term_IO(cqr);
1541 int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
1543 struct dasd_device *device;
1546 device = cqr->startdev;
1547 spin_lock_irq(get_ccwdev_lock(device->cdev));
1548 rc = _dasd_term_running_cqr(device);
1550 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1554 cqr->callback = dasd_wakeup_cb;
1555 cqr->callback_data = (void *) &generic_waitq;
1556 cqr->status = DASD_CQR_QUEUED;
1557 list_add(&cqr->devlist, &device->ccw_queue);
1559 /* let the bh start the request to keep them in order */
1560 dasd_schedule_device_bh(device);
1562 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1564 wait_event(generic_waitq, _wait_for_wakeup(cqr));
1566 if (cqr->status == DASD_CQR_DONE)
1568 else if (cqr->intrc)
1576 * Cancels a request that was started with dasd_sleep_on_req.
1577 * This is useful to timeout requests. The request will be
1578 * terminated if it is currently in i/o.
1579 * Returns 1 if the request has been terminated.
1580 * 0 if there was no need to terminate the request (not started yet)
1581 * negative error code if termination failed
1582 * Cancellation of a request is an asynchronous operation! The calling
1583 * function has to wait until the request is properly returned via callback.
1585 int dasd_cancel_req(struct dasd_ccw_req *cqr)
1587 struct dasd_device *device = cqr->startdev;
1588 unsigned long flags;
1592 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1593 switch (cqr->status) {
1594 case DASD_CQR_QUEUED:
1595 /* request was not started - just set to cleared */
1596 cqr->status = DASD_CQR_CLEARED;
1598 case DASD_CQR_IN_IO:
1599 /* request in IO - terminate IO and release again */
1600 rc = device->discipline->term_IO(cqr);
1602 dev_err(&device->cdev->dev,
1603 "Cancelling request %p failed with rc=%d\n",
1606 cqr->stopclk = get_clock();
1610 default: /* already finished or clear pending - do nothing */
1613 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1614 dasd_schedule_device_bh(device);
1620 * SECTION: Operations of the dasd_block layer.
1624 * Timeout function for dasd_block. This is used when the block layer
1625 * is waiting for something that may not come reliably, (e.g. a state
1628 static void dasd_block_timeout(unsigned long ptr)
1630 unsigned long flags;
1631 struct dasd_block *block;
1633 block = (struct dasd_block *) ptr;
1634 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
1635 /* re-activate request queue */
1636 block->base->stopped &= ~DASD_STOPPED_PENDING;
1637 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
1638 dasd_schedule_block_bh(block);
1642 * Setup timeout for a dasd_block in jiffies.
1644 void dasd_block_set_timer(struct dasd_block *block, int expires)
1647 del_timer(&block->timer);
1649 mod_timer(&block->timer, jiffies + expires);
1653 * Clear timeout for a dasd_block.
1655 void dasd_block_clear_timer(struct dasd_block *block)
1657 del_timer(&block->timer);
1661 * Process finished error recovery ccw.
1663 static inline void __dasd_block_process_erp(struct dasd_block *block,
1664 struct dasd_ccw_req *cqr)
1666 dasd_erp_fn_t erp_fn;
1667 struct dasd_device *device = block->base;
1669 if (cqr->status == DASD_CQR_DONE)
1670 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
1672 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
1673 erp_fn = device->discipline->erp_postaction(cqr);
1678 * Fetch requests from the block device queue.
1680 static void __dasd_process_request_queue(struct dasd_block *block)
1682 struct request_queue *queue;
1683 struct request *req;
1684 struct dasd_ccw_req *cqr;
1685 struct dasd_device *basedev;
1686 unsigned long flags;
1687 queue = block->request_queue;
1688 basedev = block->base;
1689 /* No queue ? Then there is nothing to do. */
1694 * We requeue request from the block device queue to the ccw
1695 * queue only in two states. In state DASD_STATE_READY the
1696 * partition detection is done and we need to requeue requests
1697 * for that. State DASD_STATE_ONLINE is normal block device
1700 if (basedev->state < DASD_STATE_READY)
1702 /* Now we try to fetch requests from the request queue */
1703 while (!blk_queue_plugged(queue) && (req = blk_peek_request(queue))) {
1704 if (basedev->features & DASD_FEATURE_READONLY &&
1705 rq_data_dir(req) == WRITE) {
1706 DBF_DEV_EVENT(DBF_ERR, basedev,
1707 "Rejecting write request %p",
1709 blk_start_request(req);
1710 __blk_end_request_all(req, -EIO);
1713 cqr = basedev->discipline->build_cp(basedev, block, req);
1715 if (PTR_ERR(cqr) == -EBUSY)
1716 break; /* normal end condition */
1717 if (PTR_ERR(cqr) == -ENOMEM)
1718 break; /* terminate request queue loop */
1719 if (PTR_ERR(cqr) == -EAGAIN) {
1721 * The current request cannot be build right
1722 * now, we have to try later. If this request
1723 * is the head-of-queue we stop the device
1726 if (!list_empty(&block->ccw_queue))
1728 spin_lock_irqsave(get_ccwdev_lock(basedev->cdev), flags);
1729 basedev->stopped |= DASD_STOPPED_PENDING;
1730 spin_unlock_irqrestore(get_ccwdev_lock(basedev->cdev), flags);
1731 dasd_block_set_timer(block, HZ/2);
1734 DBF_DEV_EVENT(DBF_ERR, basedev,
1735 "CCW creation failed (rc=%ld) "
1738 blk_start_request(req);
1739 __blk_end_request_all(req, -EIO);
1743 * Note: callback is set to dasd_return_cqr_cb in
1744 * __dasd_block_start_head to cover erp requests as well
1746 cqr->callback_data = (void *) req;
1747 cqr->status = DASD_CQR_FILLED;
1748 blk_start_request(req);
1749 list_add_tail(&cqr->blocklist, &block->ccw_queue);
1750 dasd_profile_start(block, cqr, req);
1754 static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
1756 struct request *req;
1760 req = (struct request *) cqr->callback_data;
1761 dasd_profile_end(cqr->block, cqr, req);
1762 status = cqr->block->base->discipline->free_cp(cqr, req);
1764 error = status ? status : -EIO;
1765 __blk_end_request_all(req, error);
1769 * Process ccw request queue.
1771 static void __dasd_process_block_ccw_queue(struct dasd_block *block,
1772 struct list_head *final_queue)
1774 struct list_head *l, *n;
1775 struct dasd_ccw_req *cqr;
1776 dasd_erp_fn_t erp_fn;
1777 unsigned long flags;
1778 struct dasd_device *base = block->base;
1781 /* Process request with final status. */
1782 list_for_each_safe(l, n, &block->ccw_queue) {
1783 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
1784 if (cqr->status != DASD_CQR_DONE &&
1785 cqr->status != DASD_CQR_FAILED &&
1786 cqr->status != DASD_CQR_NEED_ERP &&
1787 cqr->status != DASD_CQR_TERMINATED)
1790 if (cqr->status == DASD_CQR_TERMINATED) {
1791 base->discipline->handle_terminated_request(cqr);
1795 /* Process requests that may be recovered */
1796 if (cqr->status == DASD_CQR_NEED_ERP) {
1797 erp_fn = base->discipline->erp_action(cqr);
1802 /* log sense for fatal error */
1803 if (cqr->status == DASD_CQR_FAILED) {
1804 dasd_log_sense(cqr, &cqr->irb);
1807 /* First of all call extended error reporting. */
1808 if (dasd_eer_enabled(base) &&
1809 cqr->status == DASD_CQR_FAILED) {
1810 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
1812 /* restart request */
1813 cqr->status = DASD_CQR_FILLED;
1815 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
1816 base->stopped |= DASD_STOPPED_QUIESCE;
1817 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
1822 /* Process finished ERP request. */
1824 __dasd_block_process_erp(block, cqr);
1828 /* Rechain finished requests to final queue */
1829 cqr->endclk = get_clock();
1830 list_move_tail(&cqr->blocklist, final_queue);
1834 static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
1836 dasd_schedule_block_bh(cqr->block);
1839 static void __dasd_block_start_head(struct dasd_block *block)
1841 struct dasd_ccw_req *cqr;
1843 if (list_empty(&block->ccw_queue))
1845 /* We allways begin with the first requests on the queue, as some
1846 * of previously started requests have to be enqueued on a
1847 * dasd_device again for error recovery.
1849 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
1850 if (cqr->status != DASD_CQR_FILLED)
1852 /* Non-temporary stop condition will trigger fail fast */
1853 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
1854 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
1855 (!dasd_eer_enabled(block->base))) {
1856 cqr->status = DASD_CQR_FAILED;
1857 dasd_schedule_block_bh(block);
1860 /* Don't try to start requests if device is stopped */
1861 if (block->base->stopped)
1864 /* just a fail safe check, should not happen */
1866 cqr->startdev = block->base;
1868 /* make sure that the requests we submit find their way back */
1869 cqr->callback = dasd_return_cqr_cb;
1871 dasd_add_request_tail(cqr);
1876 * Central dasd_block layer routine. Takes requests from the generic
1877 * block layer request queue, creates ccw requests, enqueues them on
1878 * a dasd_device and processes ccw requests that have been returned.
1880 static void dasd_block_tasklet(struct dasd_block *block)
1882 struct list_head final_queue;
1883 struct list_head *l, *n;
1884 struct dasd_ccw_req *cqr;
1886 atomic_set(&block->tasklet_scheduled, 0);
1887 INIT_LIST_HEAD(&final_queue);
1888 spin_lock(&block->queue_lock);
1889 /* Finish off requests on ccw queue */
1890 __dasd_process_block_ccw_queue(block, &final_queue);
1891 spin_unlock(&block->queue_lock);
1892 /* Now call the callback function of requests with final status */
1893 spin_lock_irq(&block->request_queue_lock);
1894 list_for_each_safe(l, n, &final_queue) {
1895 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
1896 list_del_init(&cqr->blocklist);
1897 __dasd_cleanup_cqr(cqr);
1899 spin_lock(&block->queue_lock);
1900 /* Get new request from the block device request queue */
1901 __dasd_process_request_queue(block);
1902 /* Now check if the head of the ccw queue needs to be started. */
1903 __dasd_block_start_head(block);
1904 spin_unlock(&block->queue_lock);
1905 spin_unlock_irq(&block->request_queue_lock);
1906 dasd_put_device(block->base);
1909 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
1911 wake_up(&dasd_flush_wq);
1915 * Go through all request on the dasd_block request queue, cancel them
1916 * on the respective dasd_device, and return them to the generic
1919 static int dasd_flush_block_queue(struct dasd_block *block)
1921 struct dasd_ccw_req *cqr, *n;
1923 struct list_head flush_queue;
1925 INIT_LIST_HEAD(&flush_queue);
1926 spin_lock_bh(&block->queue_lock);
1929 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
1930 /* if this request currently owned by a dasd_device cancel it */
1931 if (cqr->status >= DASD_CQR_QUEUED)
1932 rc = dasd_cancel_req(cqr);
1935 /* Rechain request (including erp chain) so it won't be
1936 * touched by the dasd_block_tasklet anymore.
1937 * Replace the callback so we notice when the request
1938 * is returned from the dasd_device layer.
1940 cqr->callback = _dasd_wake_block_flush_cb;
1941 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
1942 list_move_tail(&cqr->blocklist, &flush_queue);
1944 /* moved more than one request - need to restart */
1947 spin_unlock_bh(&block->queue_lock);
1948 /* Now call the callback function of flushed requests */
1950 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
1951 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
1952 /* Process finished ERP request. */
1954 spin_lock_bh(&block->queue_lock);
1955 __dasd_block_process_erp(block, cqr);
1956 spin_unlock_bh(&block->queue_lock);
1957 /* restart list_for_xx loop since dasd_process_erp
1958 * might remove multiple elements */
1961 /* call the callback function */
1962 spin_lock_irq(&block->request_queue_lock);
1963 cqr->endclk = get_clock();
1964 list_del_init(&cqr->blocklist);
1965 __dasd_cleanup_cqr(cqr);
1966 spin_unlock_irq(&block->request_queue_lock);
1972 * Schedules a call to dasd_tasklet over the device tasklet.
1974 void dasd_schedule_block_bh(struct dasd_block *block)
1976 /* Protect against rescheduling. */
1977 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
1979 /* life cycle of block is bound to it's base device */
1980 dasd_get_device(block->base);
1981 tasklet_hi_schedule(&block->tasklet);
1986 * SECTION: external block device operations
1987 * (request queue handling, open, release, etc.)
1991 * Dasd request queue function. Called from ll_rw_blk.c
1993 static void do_dasd_request(struct request_queue *queue)
1995 struct dasd_block *block;
1997 block = queue->queuedata;
1998 spin_lock(&block->queue_lock);
1999 /* Get new request from the block device request queue */
2000 __dasd_process_request_queue(block);
2001 /* Now check if the head of the ccw queue needs to be started. */
2002 __dasd_block_start_head(block);
2003 spin_unlock(&block->queue_lock);
2007 * Allocate and initialize request queue and default I/O scheduler.
2009 static int dasd_alloc_queue(struct dasd_block *block)
2013 block->request_queue = blk_init_queue(do_dasd_request,
2014 &block->request_queue_lock);
2015 if (block->request_queue == NULL)
2018 block->request_queue->queuedata = block;
2020 elevator_exit(block->request_queue->elevator);
2021 block->request_queue->elevator = NULL;
2022 rc = elevator_init(block->request_queue, "deadline");
2024 blk_cleanup_queue(block->request_queue);
2031 * Allocate and initialize request queue.
2033 static void dasd_setup_queue(struct dasd_block *block)
2037 blk_queue_logical_block_size(block->request_queue, block->bp_block);
2038 max = block->base->discipline->max_blocks << block->s2b_shift;
2039 blk_queue_max_sectors(block->request_queue, max);
2040 blk_queue_max_phys_segments(block->request_queue, -1L);
2041 blk_queue_max_hw_segments(block->request_queue, -1L);
2042 /* with page sized segments we can translate each segement into
2045 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
2046 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
2047 blk_queue_ordered(block->request_queue, QUEUE_ORDERED_DRAIN, NULL);
2051 * Deactivate and free request queue.
2053 static void dasd_free_queue(struct dasd_block *block)
2055 if (block->request_queue) {
2056 blk_cleanup_queue(block->request_queue);
2057 block->request_queue = NULL;
2062 * Flush request on the request queue.
2064 static void dasd_flush_request_queue(struct dasd_block *block)
2066 struct request *req;
2068 if (!block->request_queue)
2071 spin_lock_irq(&block->request_queue_lock);
2072 while ((req = blk_fetch_request(block->request_queue)))
2073 __blk_end_request_all(req, -EIO);
2074 spin_unlock_irq(&block->request_queue_lock);
2077 static int dasd_open(struct block_device *bdev, fmode_t mode)
2079 struct dasd_block *block = bdev->bd_disk->private_data;
2080 struct dasd_device *base = block->base;
2083 atomic_inc(&block->open_count);
2084 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
2089 if (!try_module_get(base->discipline->owner)) {
2094 if (dasd_probeonly) {
2095 dev_info(&base->cdev->dev,
2096 "Accessing the DASD failed because it is in "
2097 "probeonly mode\n");
2102 if (base->state <= DASD_STATE_BASIC) {
2103 DBF_DEV_EVENT(DBF_ERR, base, " %s",
2104 " Cannot open unrecognized device");
2112 module_put(base->discipline->owner);
2114 atomic_dec(&block->open_count);
2118 static int dasd_release(struct gendisk *disk, fmode_t mode)
2120 struct dasd_block *block = disk->private_data;
2122 atomic_dec(&block->open_count);
2123 module_put(block->base->discipline->owner);
2128 * Return disk geometry.
2130 static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
2132 struct dasd_block *block;
2133 struct dasd_device *base;
2135 block = bdev->bd_disk->private_data;
2140 if (!base->discipline ||
2141 !base->discipline->fill_geometry)
2144 base->discipline->fill_geometry(block, geo);
2145 geo->start = get_start_sect(bdev) >> block->s2b_shift;
2149 struct block_device_operations
2150 dasd_device_operations = {
2151 .owner = THIS_MODULE,
2153 .release = dasd_release,
2154 .ioctl = dasd_ioctl,
2155 .compat_ioctl = dasd_ioctl,
2156 .getgeo = dasd_getgeo,
2159 /*******************************************************************************
2160 * end of block device operations
2166 #ifdef CONFIG_PROC_FS
2170 if (dasd_page_cache != NULL) {
2171 kmem_cache_destroy(dasd_page_cache);
2172 dasd_page_cache = NULL;
2174 dasd_gendisk_exit();
2176 if (dasd_debug_area != NULL) {
2177 debug_unregister(dasd_debug_area);
2178 dasd_debug_area = NULL;
2183 * SECTION: common functions for ccw_driver use
2186 static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
2188 struct ccw_device *cdev = data;
2191 ret = ccw_device_set_online(cdev);
2193 pr_warning("%s: Setting the DASD online failed with rc=%d\n",
2194 dev_name(&cdev->dev), ret);
2196 struct dasd_device *device = dasd_device_from_cdev(cdev);
2197 wait_event(dasd_init_waitq, _wait_for_device(device));
2198 dasd_put_device(device);
2203 * Initial attempt at a probe function. this can be simplified once
2204 * the other detection code is gone.
2206 int dasd_generic_probe(struct ccw_device *cdev,
2207 struct dasd_discipline *discipline)
2211 ret = ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP);
2213 DBF_EVENT(DBF_WARNING,
2214 "dasd_generic_probe: could not set ccw-device options "
2215 "for %s\n", dev_name(&cdev->dev));
2218 ret = dasd_add_sysfs_files(cdev);
2220 DBF_EVENT(DBF_WARNING,
2221 "dasd_generic_probe: could not add sysfs entries "
2222 "for %s\n", dev_name(&cdev->dev));
2225 cdev->handler = &dasd_int_handler;
2228 * Automatically online either all dasd devices (dasd_autodetect)
2229 * or all devices specified with dasd= parameters during
2232 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
2233 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
2234 async_schedule(dasd_generic_auto_online, cdev);
2239 * This will one day be called from a global not_oper handler.
2240 * It is also used by driver_unregister during module unload.
2242 void dasd_generic_remove(struct ccw_device *cdev)
2244 struct dasd_device *device;
2245 struct dasd_block *block;
2247 cdev->handler = NULL;
2249 dasd_remove_sysfs_files(cdev);
2250 device = dasd_device_from_cdev(cdev);
2253 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
2254 /* Already doing offline processing */
2255 dasd_put_device(device);
2259 * This device is removed unconditionally. Set offline
2260 * flag to prevent dasd_open from opening it while it is
2261 * no quite down yet.
2263 dasd_set_target_state(device, DASD_STATE_NEW);
2264 /* dasd_delete_device destroys the device reference. */
2265 block = device->block;
2266 device->block = NULL;
2267 dasd_delete_device(device);
2269 * life cycle of block is bound to device, so delete it after
2270 * device was safely removed
2273 dasd_free_block(block);
2277 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
2278 * the device is detected for the first time and is supposed to be used
2279 * or the user has started activation through sysfs.
2281 int dasd_generic_set_online(struct ccw_device *cdev,
2282 struct dasd_discipline *base_discipline)
2284 struct dasd_discipline *discipline;
2285 struct dasd_device *device;
2288 /* first online clears initial online feature flag */
2289 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
2290 device = dasd_create_device(cdev);
2292 return PTR_ERR(device);
2294 discipline = base_discipline;
2295 if (device->features & DASD_FEATURE_USEDIAG) {
2296 if (!dasd_diag_discipline_pointer) {
2297 pr_warning("%s Setting the DASD online failed because "
2298 "of missing DIAG discipline\n",
2299 dev_name(&cdev->dev));
2300 dasd_delete_device(device);
2303 discipline = dasd_diag_discipline_pointer;
2305 if (!try_module_get(base_discipline->owner)) {
2306 dasd_delete_device(device);
2309 if (!try_module_get(discipline->owner)) {
2310 module_put(base_discipline->owner);
2311 dasd_delete_device(device);
2314 device->base_discipline = base_discipline;
2315 device->discipline = discipline;
2317 /* check_device will allocate block device if necessary */
2318 rc = discipline->check_device(device);
2320 pr_warning("%s Setting the DASD online with discipline %s "
2321 "failed with rc=%i\n",
2322 dev_name(&cdev->dev), discipline->name, rc);
2323 module_put(discipline->owner);
2324 module_put(base_discipline->owner);
2325 dasd_delete_device(device);
2329 dasd_set_target_state(device, DASD_STATE_ONLINE);
2330 if (device->state <= DASD_STATE_KNOWN) {
2331 pr_warning("%s Setting the DASD online failed because of a "
2332 "missing discipline\n", dev_name(&cdev->dev));
2334 dasd_set_target_state(device, DASD_STATE_NEW);
2336 dasd_free_block(device->block);
2337 dasd_delete_device(device);
2339 pr_debug("dasd_generic device %s found\n",
2340 dev_name(&cdev->dev));
2341 dasd_put_device(device);
2345 int dasd_generic_set_offline(struct ccw_device *cdev)
2347 struct dasd_device *device;
2348 struct dasd_block *block;
2349 int max_count, open_count;
2351 device = dasd_device_from_cdev(cdev);
2353 return PTR_ERR(device);
2354 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
2355 /* Already doing offline processing */
2356 dasd_put_device(device);
2360 * We must make sure that this device is currently not in use.
2361 * The open_count is increased for every opener, that includes
2362 * the blkdev_get in dasd_scan_partitions. We are only interested
2363 * in the other openers.
2365 if (device->block) {
2366 max_count = device->block->bdev ? 0 : -1;
2367 open_count = atomic_read(&device->block->open_count);
2368 if (open_count > max_count) {
2370 pr_warning("%s: The DASD cannot be set offline "
2371 "with open count %i\n",
2372 dev_name(&cdev->dev), open_count);
2374 pr_warning("%s: The DASD cannot be set offline "
2375 "while it is in use\n",
2376 dev_name(&cdev->dev));
2377 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
2378 dasd_put_device(device);
2382 dasd_set_target_state(device, DASD_STATE_NEW);
2383 /* dasd_delete_device destroys the device reference. */
2384 block = device->block;
2385 device->block = NULL;
2386 dasd_delete_device(device);
2388 * life cycle of block is bound to device, so delete it after
2389 * device was safely removed
2392 dasd_free_block(block);
2396 int dasd_generic_notify(struct ccw_device *cdev, int event)
2398 struct dasd_device *device;
2399 struct dasd_ccw_req *cqr;
2402 device = dasd_device_from_cdev_locked(cdev);
2410 /* First of all call extended error reporting. */
2411 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
2413 if (device->state < DASD_STATE_BASIC)
2415 /* Device is active. We want to keep it. */
2416 list_for_each_entry(cqr, &device->ccw_queue, devlist)
2417 if (cqr->status == DASD_CQR_IN_IO) {
2418 cqr->status = DASD_CQR_QUEUED;
2421 device->stopped |= DASD_STOPPED_DC_WAIT;
2422 dasd_device_clear_timer(device);
2423 dasd_schedule_device_bh(device);
2427 /* FIXME: add a sanity check. */
2428 device->stopped &= ~DASD_STOPPED_DC_WAIT;
2429 if (device->stopped & DASD_UNRESUMED_PM) {
2430 device->stopped &= ~DASD_UNRESUMED_PM;
2431 dasd_restore_device(device);
2435 dasd_schedule_device_bh(device);
2437 dasd_schedule_block_bh(device->block);
2441 dasd_put_device(device);
2445 int dasd_generic_pm_freeze(struct ccw_device *cdev)
2447 struct dasd_ccw_req *cqr, *n;
2449 struct list_head freeze_queue;
2450 struct dasd_device *device = dasd_device_from_cdev(cdev);
2453 return PTR_ERR(device);
2454 /* disallow new I/O */
2455 device->stopped |= DASD_STOPPED_PM;
2456 /* clear active requests */
2457 INIT_LIST_HEAD(&freeze_queue);
2458 spin_lock_irq(get_ccwdev_lock(cdev));
2460 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
2461 /* Check status and move request to flush_queue */
2462 if (cqr->status == DASD_CQR_IN_IO) {
2463 rc = device->discipline->term_IO(cqr);
2465 /* unable to terminate requeust */
2466 dev_err(&device->cdev->dev,
2467 "Unable to terminate request %p "
2468 "on suspend\n", cqr);
2469 spin_unlock_irq(get_ccwdev_lock(cdev));
2470 dasd_put_device(device);
2474 list_move_tail(&cqr->devlist, &freeze_queue);
2477 spin_unlock_irq(get_ccwdev_lock(cdev));
2479 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
2480 wait_event(dasd_flush_wq,
2481 (cqr->status != DASD_CQR_CLEAR_PENDING));
2482 if (cqr->status == DASD_CQR_CLEARED)
2483 cqr->status = DASD_CQR_QUEUED;
2485 /* move freeze_queue to start of the ccw_queue */
2486 spin_lock_irq(get_ccwdev_lock(cdev));
2487 list_splice_tail(&freeze_queue, &device->ccw_queue);
2488 spin_unlock_irq(get_ccwdev_lock(cdev));
2490 if (device->discipline->freeze)
2491 rc = device->discipline->freeze(device);
2493 dasd_put_device(device);
2496 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
2498 int dasd_generic_restore_device(struct ccw_device *cdev)
2500 struct dasd_device *device = dasd_device_from_cdev(cdev);
2504 return PTR_ERR(device);
2506 dasd_schedule_device_bh(device);
2508 dasd_schedule_block_bh(device->block);
2510 if (device->discipline->restore)
2511 rc = device->discipline->restore(device);
2513 dasd_put_device(device);
2516 EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
2518 static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
2520 int rdc_buffer_size,
2523 struct dasd_ccw_req *cqr;
2526 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
2529 /* internal error 13 - Allocating the RDC request failed*/
2530 dev_err(&device->cdev->dev,
2531 "An error occurred in the DASD device driver, "
2532 "reason=%s\n", "13");
2537 ccw->cmd_code = CCW_CMD_RDC;
2538 ccw->cda = (__u32)(addr_t)rdc_buffer;
2539 ccw->count = rdc_buffer_size;
2541 cqr->startdev = device;
2542 cqr->memdev = device;
2543 cqr->expires = 10*HZ;
2544 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2546 cqr->buildclk = get_clock();
2547 cqr->status = DASD_CQR_FILLED;
2552 int dasd_generic_read_dev_chars(struct dasd_device *device, char *magic,
2553 void *rdc_buffer, int rdc_buffer_size)
2556 struct dasd_ccw_req *cqr;
2558 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
2561 return PTR_ERR(cqr);
2563 ret = dasd_sleep_on(cqr);
2564 dasd_sfree_request(cqr, cqr->memdev);
2567 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
2570 * In command mode and transport mode we need to look for sense
2571 * data in different places. The sense data itself is allways
2572 * an array of 32 bytes, so we can unify the sense data access
2575 char *dasd_get_sense(struct irb *irb)
2577 struct tsb *tsb = NULL;
2580 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
2581 if (irb->scsw.tm.tcw)
2582 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
2584 if (tsb && tsb->length == 64 && tsb->flags)
2585 switch (tsb->flags & 0x07) {
2586 case 1: /* tsa_iostat */
2587 sense = tsb->tsa.iostat.sense;
2589 case 2: /* tsa_ddpc */
2590 sense = tsb->tsa.ddpc.sense;
2593 /* currently we don't use interrogate data */
2596 } else if (irb->esw.esw0.erw.cons) {
2601 EXPORT_SYMBOL_GPL(dasd_get_sense);
2603 static int __init dasd_init(void)
2607 init_waitqueue_head(&dasd_init_waitq);
2608 init_waitqueue_head(&dasd_flush_wq);
2609 init_waitqueue_head(&generic_waitq);
2611 /* register 'common' DASD debug area, used for all DBF_XXX calls */
2612 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
2613 if (dasd_debug_area == NULL) {
2617 debug_register_view(dasd_debug_area, &debug_sprintf_view);
2618 debug_set_level(dasd_debug_area, DBF_WARNING);
2620 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
2622 dasd_diag_discipline_pointer = NULL;
2624 rc = dasd_devmap_init();
2627 rc = dasd_gendisk_init();
2633 rc = dasd_eer_init();
2636 #ifdef CONFIG_PROC_FS
2637 rc = dasd_proc_init();
2644 pr_info("The DASD device driver could not be initialized\n");
2649 module_init(dasd_init);
2650 module_exit(dasd_exit);
2652 EXPORT_SYMBOL(dasd_debug_area);
2653 EXPORT_SYMBOL(dasd_diag_discipline_pointer);
2655 EXPORT_SYMBOL(dasd_add_request_head);
2656 EXPORT_SYMBOL(dasd_add_request_tail);
2657 EXPORT_SYMBOL(dasd_cancel_req);
2658 EXPORT_SYMBOL(dasd_device_clear_timer);
2659 EXPORT_SYMBOL(dasd_block_clear_timer);
2660 EXPORT_SYMBOL(dasd_enable_device);
2661 EXPORT_SYMBOL(dasd_int_handler);
2662 EXPORT_SYMBOL(dasd_kfree_request);
2663 EXPORT_SYMBOL(dasd_kick_device);
2664 EXPORT_SYMBOL(dasd_kmalloc_request);
2665 EXPORT_SYMBOL(dasd_schedule_device_bh);
2666 EXPORT_SYMBOL(dasd_schedule_block_bh);
2667 EXPORT_SYMBOL(dasd_set_target_state);
2668 EXPORT_SYMBOL(dasd_device_set_timer);
2669 EXPORT_SYMBOL(dasd_block_set_timer);
2670 EXPORT_SYMBOL(dasd_sfree_request);
2671 EXPORT_SYMBOL(dasd_sleep_on);
2672 EXPORT_SYMBOL(dasd_sleep_on_immediatly);
2673 EXPORT_SYMBOL(dasd_sleep_on_interruptible);
2674 EXPORT_SYMBOL(dasd_smalloc_request);
2675 EXPORT_SYMBOL(dasd_start_IO);
2676 EXPORT_SYMBOL(dasd_term_IO);
2678 EXPORT_SYMBOL_GPL(dasd_generic_probe);
2679 EXPORT_SYMBOL_GPL(dasd_generic_remove);
2680 EXPORT_SYMBOL_GPL(dasd_generic_notify);
2681 EXPORT_SYMBOL_GPL(dasd_generic_set_online);
2682 EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
2683 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
2684 EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
2685 EXPORT_SYMBOL_GPL(dasd_alloc_block);
2686 EXPORT_SYMBOL_GPL(dasd_free_block);