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/kernel_stat.h>
15 #include <linux/kmod.h>
16 #include <linux/init.h>
17 #include <linux/interrupt.h>
18 #include <linux/ctype.h>
19 #include <linux/major.h>
20 #include <linux/slab.h>
21 #include <linux/buffer_head.h>
22 #include <linux/hdreg.h>
23 #include <linux/async.h>
24 #include <linux/mutex.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 struct dasd_discipline *dasd_diag_discipline_pointer;
49 void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
51 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
52 MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
53 " Copyright 2000 IBM Corporation");
54 MODULE_SUPPORTED_DEVICE("dasd");
55 MODULE_LICENSE("GPL");
58 * SECTION: prototypes for static functions of dasd.c
60 static int dasd_alloc_queue(struct dasd_block *);
61 static void dasd_setup_queue(struct dasd_block *);
62 static void dasd_free_queue(struct dasd_block *);
63 static void dasd_flush_request_queue(struct dasd_block *);
64 static int dasd_flush_block_queue(struct dasd_block *);
65 static void dasd_device_tasklet(struct dasd_device *);
66 static void dasd_block_tasklet(struct dasd_block *);
67 static void do_kick_device(struct work_struct *);
68 static void do_restore_device(struct work_struct *);
69 static void do_reload_device(struct work_struct *);
70 static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
71 static void dasd_device_timeout(unsigned long);
72 static void dasd_block_timeout(unsigned long);
73 static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *);
76 * SECTION: Operations on the device structure.
78 static wait_queue_head_t dasd_init_waitq;
79 static wait_queue_head_t dasd_flush_wq;
80 static wait_queue_head_t generic_waitq;
83 * Allocate memory for a new device structure.
85 struct dasd_device *dasd_alloc_device(void)
87 struct dasd_device *device;
89 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC);
91 return ERR_PTR(-ENOMEM);
93 /* Get two pages for normal block device operations. */
94 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
95 if (!device->ccw_mem) {
97 return ERR_PTR(-ENOMEM);
99 /* Get one page for error recovery. */
100 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
101 if (!device->erp_mem) {
102 free_pages((unsigned long) device->ccw_mem, 1);
104 return ERR_PTR(-ENOMEM);
107 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
108 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
109 spin_lock_init(&device->mem_lock);
110 atomic_set(&device->tasklet_scheduled, 0);
111 tasklet_init(&device->tasklet,
112 (void (*)(unsigned long)) dasd_device_tasklet,
113 (unsigned long) device);
114 INIT_LIST_HEAD(&device->ccw_queue);
115 init_timer(&device->timer);
116 device->timer.function = dasd_device_timeout;
117 device->timer.data = (unsigned long) device;
118 INIT_WORK(&device->kick_work, do_kick_device);
119 INIT_WORK(&device->restore_device, do_restore_device);
120 INIT_WORK(&device->reload_device, do_reload_device);
121 device->state = DASD_STATE_NEW;
122 device->target = DASD_STATE_NEW;
123 mutex_init(&device->state_mutex);
129 * Free memory of a device structure.
131 void dasd_free_device(struct dasd_device *device)
133 kfree(device->private);
134 free_page((unsigned long) device->erp_mem);
135 free_pages((unsigned long) device->ccw_mem, 1);
140 * Allocate memory for a new device structure.
142 struct dasd_block *dasd_alloc_block(void)
144 struct dasd_block *block;
146 block = kzalloc(sizeof(*block), GFP_ATOMIC);
148 return ERR_PTR(-ENOMEM);
149 /* open_count = 0 means device online but not in use */
150 atomic_set(&block->open_count, -1);
152 spin_lock_init(&block->request_queue_lock);
153 atomic_set(&block->tasklet_scheduled, 0);
154 tasklet_init(&block->tasklet,
155 (void (*)(unsigned long)) dasd_block_tasklet,
156 (unsigned long) block);
157 INIT_LIST_HEAD(&block->ccw_queue);
158 spin_lock_init(&block->queue_lock);
159 init_timer(&block->timer);
160 block->timer.function = dasd_block_timeout;
161 block->timer.data = (unsigned long) block;
167 * Free memory of a device structure.
169 void dasd_free_block(struct dasd_block *block)
175 * Make a new device known to the system.
177 static int dasd_state_new_to_known(struct dasd_device *device)
182 * As long as the device is not in state DASD_STATE_NEW we want to
183 * keep the reference count > 0.
185 dasd_get_device(device);
188 rc = dasd_alloc_queue(device->block);
190 dasd_put_device(device);
194 device->state = DASD_STATE_KNOWN;
199 * Let the system forget about a device.
201 static int dasd_state_known_to_new(struct dasd_device *device)
203 /* Disable extended error reporting for this device. */
204 dasd_eer_disable(device);
205 /* Forget the discipline information. */
206 if (device->discipline) {
207 if (device->discipline->uncheck_device)
208 device->discipline->uncheck_device(device);
209 module_put(device->discipline->owner);
211 device->discipline = NULL;
212 if (device->base_discipline)
213 module_put(device->base_discipline->owner);
214 device->base_discipline = NULL;
215 device->state = DASD_STATE_NEW;
218 dasd_free_queue(device->block);
220 /* Give up reference we took in dasd_state_new_to_known. */
221 dasd_put_device(device);
226 * Request the irq line for the device.
228 static int dasd_state_known_to_basic(struct dasd_device *device)
232 /* Allocate and register gendisk structure. */
234 rc = dasd_gendisk_alloc(device->block);
238 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
239 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1,
241 debug_register_view(device->debug_area, &debug_sprintf_view);
242 debug_set_level(device->debug_area, DBF_WARNING);
243 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
245 device->state = DASD_STATE_BASIC;
250 * Release the irq line for the device. Terminate any running i/o.
252 static int dasd_state_basic_to_known(struct dasd_device *device)
256 dasd_gendisk_free(device->block);
257 dasd_block_clear_timer(device->block);
259 rc = dasd_flush_device_queue(device);
262 dasd_device_clear_timer(device);
264 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
265 if (device->debug_area != NULL) {
266 debug_unregister(device->debug_area);
267 device->debug_area = NULL;
269 device->state = DASD_STATE_KNOWN;
274 * Do the initial analysis. The do_analysis function may return
275 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
276 * until the discipline decides to continue the startup sequence
277 * by calling the function dasd_change_state. The eckd disciplines
278 * uses this to start a ccw that detects the format. The completion
279 * interrupt for this detection ccw uses the kernel event daemon to
280 * trigger the call to dasd_change_state. All this is done in the
281 * discipline code, see dasd_eckd.c.
282 * After the analysis ccw is done (do_analysis returned 0) the block
284 * In case the analysis returns an error, the device setup is stopped
285 * (a fake disk was already added to allow formatting).
287 static int dasd_state_basic_to_ready(struct dasd_device *device)
290 struct dasd_block *block;
293 block = device->block;
294 /* make disk known with correct capacity */
296 if (block->base->discipline->do_analysis != NULL)
297 rc = block->base->discipline->do_analysis(block);
300 device->state = DASD_STATE_UNFMT;
303 dasd_setup_queue(block);
304 set_capacity(block->gdp,
305 block->blocks << block->s2b_shift);
306 device->state = DASD_STATE_READY;
307 rc = dasd_scan_partitions(block);
309 device->state = DASD_STATE_BASIC;
311 device->state = DASD_STATE_READY;
317 * Remove device from block device layer. Destroy dirty buffers.
318 * Forget format information. Check if the target level is basic
319 * and if it is create fake disk for formatting.
321 static int dasd_state_ready_to_basic(struct dasd_device *device)
325 device->state = DASD_STATE_BASIC;
327 struct dasd_block *block = device->block;
328 rc = dasd_flush_block_queue(block);
330 device->state = DASD_STATE_READY;
333 dasd_flush_request_queue(block);
334 dasd_destroy_partitions(block);
337 block->s2b_shift = 0;
345 static int dasd_state_unfmt_to_basic(struct dasd_device *device)
347 device->state = DASD_STATE_BASIC;
352 * Make the device online and schedule the bottom half to start
353 * the requeueing of requests from the linux request queue to the
357 dasd_state_ready_to_online(struct dasd_device * device)
360 struct gendisk *disk;
361 struct disk_part_iter piter;
362 struct hd_struct *part;
364 if (device->discipline->ready_to_online) {
365 rc = device->discipline->ready_to_online(device);
369 device->state = DASD_STATE_ONLINE;
371 dasd_schedule_block_bh(device->block);
372 if ((device->features & DASD_FEATURE_USERAW)) {
373 disk = device->block->gdp;
374 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
377 disk = device->block->bdev->bd_disk;
378 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
379 while ((part = disk_part_iter_next(&piter)))
380 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
381 disk_part_iter_exit(&piter);
387 * Stop the requeueing of requests again.
389 static int dasd_state_online_to_ready(struct dasd_device *device)
392 struct gendisk *disk;
393 struct disk_part_iter piter;
394 struct hd_struct *part;
396 if (device->discipline->online_to_ready) {
397 rc = device->discipline->online_to_ready(device);
401 device->state = DASD_STATE_READY;
402 if (device->block && !(device->features & DASD_FEATURE_USERAW)) {
403 disk = device->block->bdev->bd_disk;
404 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
405 while ((part = disk_part_iter_next(&piter)))
406 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
407 disk_part_iter_exit(&piter);
413 * Device startup state changes.
415 static int dasd_increase_state(struct dasd_device *device)
420 if (device->state == DASD_STATE_NEW &&
421 device->target >= DASD_STATE_KNOWN)
422 rc = dasd_state_new_to_known(device);
425 device->state == DASD_STATE_KNOWN &&
426 device->target >= DASD_STATE_BASIC)
427 rc = dasd_state_known_to_basic(device);
430 device->state == DASD_STATE_BASIC &&
431 device->target >= DASD_STATE_READY)
432 rc = dasd_state_basic_to_ready(device);
435 device->state == DASD_STATE_UNFMT &&
436 device->target > DASD_STATE_UNFMT)
440 device->state == DASD_STATE_READY &&
441 device->target >= DASD_STATE_ONLINE)
442 rc = dasd_state_ready_to_online(device);
448 * Device shutdown state changes.
450 static int dasd_decrease_state(struct dasd_device *device)
455 if (device->state == DASD_STATE_ONLINE &&
456 device->target <= DASD_STATE_READY)
457 rc = dasd_state_online_to_ready(device);
460 device->state == DASD_STATE_READY &&
461 device->target <= DASD_STATE_BASIC)
462 rc = dasd_state_ready_to_basic(device);
465 device->state == DASD_STATE_UNFMT &&
466 device->target <= DASD_STATE_BASIC)
467 rc = dasd_state_unfmt_to_basic(device);
470 device->state == DASD_STATE_BASIC &&
471 device->target <= DASD_STATE_KNOWN)
472 rc = dasd_state_basic_to_known(device);
475 device->state == DASD_STATE_KNOWN &&
476 device->target <= DASD_STATE_NEW)
477 rc = dasd_state_known_to_new(device);
483 * This is the main startup/shutdown routine.
485 static void dasd_change_state(struct dasd_device *device)
489 if (device->state == device->target)
490 /* Already where we want to go today... */
492 if (device->state < device->target)
493 rc = dasd_increase_state(device);
495 rc = dasd_decrease_state(device);
499 device->target = device->state;
501 if (device->state == device->target)
502 wake_up(&dasd_init_waitq);
504 /* let user-space know that the device status changed */
505 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
509 * Kick starter for devices that did not complete the startup/shutdown
510 * procedure or were sleeping because of a pending state.
511 * dasd_kick_device will schedule a call do do_kick_device to the kernel
514 static void do_kick_device(struct work_struct *work)
516 struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
517 mutex_lock(&device->state_mutex);
518 dasd_change_state(device);
519 mutex_unlock(&device->state_mutex);
520 dasd_schedule_device_bh(device);
521 dasd_put_device(device);
524 void dasd_kick_device(struct dasd_device *device)
526 dasd_get_device(device);
527 /* queue call to dasd_kick_device to the kernel event daemon. */
528 schedule_work(&device->kick_work);
532 * dasd_reload_device will schedule a call do do_reload_device to the kernel
535 static void do_reload_device(struct work_struct *work)
537 struct dasd_device *device = container_of(work, struct dasd_device,
539 device->discipline->reload(device);
540 dasd_put_device(device);
543 void dasd_reload_device(struct dasd_device *device)
545 dasd_get_device(device);
546 /* queue call to dasd_reload_device to the kernel event daemon. */
547 schedule_work(&device->reload_device);
549 EXPORT_SYMBOL(dasd_reload_device);
552 * dasd_restore_device will schedule a call do do_restore_device to the kernel
555 static void do_restore_device(struct work_struct *work)
557 struct dasd_device *device = container_of(work, struct dasd_device,
559 device->cdev->drv->restore(device->cdev);
560 dasd_put_device(device);
563 void dasd_restore_device(struct dasd_device *device)
565 dasd_get_device(device);
566 /* queue call to dasd_restore_device to the kernel event daemon. */
567 schedule_work(&device->restore_device);
571 * Set the target state for a device and starts the state change.
573 void dasd_set_target_state(struct dasd_device *device, int target)
575 dasd_get_device(device);
576 mutex_lock(&device->state_mutex);
577 /* If we are in probeonly mode stop at DASD_STATE_READY. */
578 if (dasd_probeonly && target > DASD_STATE_READY)
579 target = DASD_STATE_READY;
580 if (device->target != target) {
581 if (device->state == target)
582 wake_up(&dasd_init_waitq);
583 device->target = target;
585 if (device->state != device->target)
586 dasd_change_state(device);
587 mutex_unlock(&device->state_mutex);
588 dasd_put_device(device);
592 * Enable devices with device numbers in [from..to].
594 static inline int _wait_for_device(struct dasd_device *device)
596 return (device->state == device->target);
599 void dasd_enable_device(struct dasd_device *device)
601 dasd_set_target_state(device, DASD_STATE_ONLINE);
602 if (device->state <= DASD_STATE_KNOWN)
603 /* No discipline for device found. */
604 dasd_set_target_state(device, DASD_STATE_NEW);
605 /* Now wait for the devices to come up. */
606 wait_event(dasd_init_waitq, _wait_for_device(device));
610 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
612 #ifdef CONFIG_DASD_PROFILE
614 struct dasd_profile_info_t dasd_global_profile;
615 unsigned int dasd_profile_level = DASD_PROFILE_OFF;
618 * Increments counter in global and local profiling structures.
620 #define dasd_profile_counter(value, counter, block) \
623 for (index = 0; index < 31 && value >> (2+index); index++); \
624 dasd_global_profile.counter[index]++; \
625 block->profile.counter[index]++; \
629 * Add profiling information for cqr before execution.
631 static void dasd_profile_start(struct dasd_block *block,
632 struct dasd_ccw_req *cqr,
636 unsigned int counter;
638 if (dasd_profile_level != DASD_PROFILE_ON)
641 /* count the length of the chanq for statistics */
643 list_for_each(l, &block->ccw_queue)
646 dasd_global_profile.dasd_io_nr_req[counter]++;
647 block->profile.dasd_io_nr_req[counter]++;
651 * Add profiling information for cqr after execution.
653 static void dasd_profile_end(struct dasd_block *block,
654 struct dasd_ccw_req *cqr,
657 long strtime, irqtime, endtime, tottime; /* in microseconds */
658 long tottimeps, sectors;
660 if (dasd_profile_level != DASD_PROFILE_ON)
663 sectors = blk_rq_sectors(req);
664 if (!cqr->buildclk || !cqr->startclk ||
665 !cqr->stopclk || !cqr->endclk ||
669 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
670 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
671 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
672 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
673 tottimeps = tottime / sectors;
675 if (!dasd_global_profile.dasd_io_reqs)
676 memset(&dasd_global_profile, 0,
677 sizeof(struct dasd_profile_info_t));
678 dasd_global_profile.dasd_io_reqs++;
679 dasd_global_profile.dasd_io_sects += sectors;
681 if (!block->profile.dasd_io_reqs)
682 memset(&block->profile, 0,
683 sizeof(struct dasd_profile_info_t));
684 block->profile.dasd_io_reqs++;
685 block->profile.dasd_io_sects += sectors;
687 dasd_profile_counter(sectors, dasd_io_secs, block);
688 dasd_profile_counter(tottime, dasd_io_times, block);
689 dasd_profile_counter(tottimeps, dasd_io_timps, block);
690 dasd_profile_counter(strtime, dasd_io_time1, block);
691 dasd_profile_counter(irqtime, dasd_io_time2, block);
692 dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, block);
693 dasd_profile_counter(endtime, dasd_io_time3, block);
696 #define dasd_profile_start(block, cqr, req) do {} while (0)
697 #define dasd_profile_end(block, cqr, req) do {} while (0)
698 #endif /* CONFIG_DASD_PROFILE */
701 * Allocate memory for a channel program with 'cplength' channel
702 * command words and 'datasize' additional space. There are two
703 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
704 * memory and 2) dasd_smalloc_request uses the static ccw memory
705 * that gets allocated for each device.
707 struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
709 struct dasd_device *device)
711 struct dasd_ccw_req *cqr;
714 BUG_ON(datasize > PAGE_SIZE ||
715 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
717 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
719 return ERR_PTR(-ENOMEM);
722 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
723 GFP_ATOMIC | GFP_DMA);
724 if (cqr->cpaddr == NULL) {
726 return ERR_PTR(-ENOMEM);
731 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
732 if (cqr->data == NULL) {
735 return ERR_PTR(-ENOMEM);
739 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
740 dasd_get_device(device);
744 struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
746 struct dasd_device *device)
749 struct dasd_ccw_req *cqr;
753 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
755 size += cplength * sizeof(struct ccw1);
758 spin_lock_irqsave(&device->mem_lock, flags);
759 cqr = (struct dasd_ccw_req *)
760 dasd_alloc_chunk(&device->ccw_chunks, size);
761 spin_unlock_irqrestore(&device->mem_lock, flags);
763 return ERR_PTR(-ENOMEM);
764 memset(cqr, 0, sizeof(struct dasd_ccw_req));
765 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
768 cqr->cpaddr = (struct ccw1 *) data;
769 data += cplength*sizeof(struct ccw1);
770 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
775 memset(cqr->data, 0, datasize);
778 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
779 dasd_get_device(device);
784 * Free memory of a channel program. This function needs to free all the
785 * idal lists that might have been created by dasd_set_cda and the
786 * struct dasd_ccw_req itself.
788 void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
793 /* Clear any idals used for the request. */
796 clear_normalized_cda(ccw);
797 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
802 dasd_put_device(device);
805 void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
809 spin_lock_irqsave(&device->mem_lock, flags);
810 dasd_free_chunk(&device->ccw_chunks, cqr);
811 spin_unlock_irqrestore(&device->mem_lock, flags);
812 dasd_put_device(device);
816 * Check discipline magic in cqr.
818 static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
820 struct dasd_device *device;
824 device = cqr->startdev;
825 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
826 DBF_DEV_EVENT(DBF_WARNING, device,
827 " dasd_ccw_req 0x%08x magic doesn't match"
828 " discipline 0x%08x",
830 *(unsigned int *) device->discipline->name);
837 * Terminate the current i/o and set the request to clear_pending.
838 * Timer keeps device runnig.
839 * ccw_device_clear can fail if the i/o subsystem
842 int dasd_term_IO(struct dasd_ccw_req *cqr)
844 struct dasd_device *device;
846 char errorstring[ERRORLENGTH];
849 rc = dasd_check_cqr(cqr);
853 device = (struct dasd_device *) cqr->startdev;
854 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
855 rc = ccw_device_clear(device->cdev, (long) cqr);
857 case 0: /* termination successful */
859 cqr->status = DASD_CQR_CLEAR_PENDING;
860 cqr->stopclk = get_clock();
862 DBF_DEV_EVENT(DBF_DEBUG, device,
863 "terminate cqr %p successful",
867 DBF_DEV_EVENT(DBF_ERR, device, "%s",
868 "device gone, retry");
871 DBF_DEV_EVENT(DBF_ERR, device, "%s",
876 DBF_DEV_EVENT(DBF_ERR, device, "%s",
877 "device busy, retry later");
880 /* internal error 10 - unknown rc*/
881 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
882 dev_err(&device->cdev->dev, "An error occurred in the "
883 "DASD device driver, reason=%s\n", errorstring);
889 dasd_schedule_device_bh(device);
894 * Start the i/o. This start_IO can fail if the channel is really busy.
895 * In that case set up a timer to start the request later.
897 int dasd_start_IO(struct dasd_ccw_req *cqr)
899 struct dasd_device *device;
901 char errorstring[ERRORLENGTH];
904 rc = dasd_check_cqr(cqr);
909 device = (struct dasd_device *) cqr->startdev;
911 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) ||
912 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) &&
913 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
914 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p "
915 "because of stolen lock", cqr);
916 cqr->status = DASD_CQR_ERROR;
920 if (cqr->retries < 0) {
921 /* internal error 14 - start_IO run out of retries */
922 sprintf(errorstring, "14 %p", cqr);
923 dev_err(&device->cdev->dev, "An error occurred in the DASD "
924 "device driver, reason=%s\n", errorstring);
925 cqr->status = DASD_CQR_ERROR;
928 cqr->startclk = get_clock();
929 cqr->starttime = jiffies;
931 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
932 cqr->lpm &= device->path_data.opm;
934 cqr->lpm = device->path_data.opm;
936 if (cqr->cpmode == 1) {
937 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
938 (long) cqr, cqr->lpm);
940 rc = ccw_device_start(device->cdev, cqr->cpaddr,
941 (long) cqr, cqr->lpm, 0);
945 cqr->status = DASD_CQR_IN_IO;
948 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
949 "start_IO: device busy, retry later");
952 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
953 "start_IO: request timeout, retry later");
956 /* -EACCES indicates that the request used only a subset of the
957 * available paths and all these paths are gone. If the lpm of
958 * this request was only a subset of the opm (e.g. the ppm) then
959 * we just do a retry with all available paths.
960 * If we already use the full opm, something is amiss, and we
961 * need a full path verification.
963 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
964 DBF_DEV_EVENT(DBF_WARNING, device,
965 "start_IO: selected paths gone (%x)",
967 } else if (cqr->lpm != device->path_data.opm) {
968 cqr->lpm = device->path_data.opm;
969 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
970 "start_IO: selected paths gone,"
971 " retry on all paths");
973 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
974 "start_IO: all paths in opm gone,"
975 " do path verification");
976 dasd_generic_last_path_gone(device);
977 device->path_data.opm = 0;
978 device->path_data.ppm = 0;
979 device->path_data.npm = 0;
980 device->path_data.tbvpm =
981 ccw_device_get_path_mask(device->cdev);
985 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
986 "start_IO: -ENODEV device gone, retry");
989 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
990 "start_IO: -EIO device gone, retry");
993 /* most likely caused in power management context */
994 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
995 "start_IO: -EINVAL device currently "
999 /* internal error 11 - unknown rc */
1000 snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
1001 dev_err(&device->cdev->dev,
1002 "An error occurred in the DASD device driver, "
1003 "reason=%s\n", errorstring);
1012 * Timeout function for dasd devices. This is used for different purposes
1013 * 1) missing interrupt handler for normal operation
1014 * 2) delayed start of request where start_IO failed with -EBUSY
1015 * 3) timeout for missing state change interrupts
1016 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
1017 * DASD_CQR_QUEUED for 2) and 3).
1019 static void dasd_device_timeout(unsigned long ptr)
1021 unsigned long flags;
1022 struct dasd_device *device;
1024 device = (struct dasd_device *) ptr;
1025 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1026 /* re-activate request queue */
1027 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1028 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1029 dasd_schedule_device_bh(device);
1033 * Setup timeout for a device in jiffies.
1035 void dasd_device_set_timer(struct dasd_device *device, int expires)
1038 del_timer(&device->timer);
1040 mod_timer(&device->timer, jiffies + expires);
1044 * Clear timeout for a device.
1046 void dasd_device_clear_timer(struct dasd_device *device)
1048 del_timer(&device->timer);
1051 static void dasd_handle_killed_request(struct ccw_device *cdev,
1052 unsigned long intparm)
1054 struct dasd_ccw_req *cqr;
1055 struct dasd_device *device;
1059 cqr = (struct dasd_ccw_req *) intparm;
1060 if (cqr->status != DASD_CQR_IN_IO) {
1061 DBF_EVENT_DEVID(DBF_DEBUG, cdev,
1062 "invalid status in handle_killed_request: "
1063 "%02x", cqr->status);
1067 device = dasd_device_from_cdev_locked(cdev);
1068 if (IS_ERR(device)) {
1069 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1070 "unable to get device from cdev");
1074 if (!cqr->startdev ||
1075 device != cqr->startdev ||
1076 strncmp(cqr->startdev->discipline->ebcname,
1077 (char *) &cqr->magic, 4)) {
1078 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1079 "invalid device in request");
1080 dasd_put_device(device);
1084 /* Schedule request to be retried. */
1085 cqr->status = DASD_CQR_QUEUED;
1087 dasd_device_clear_timer(device);
1088 dasd_schedule_device_bh(device);
1089 dasd_put_device(device);
1092 void dasd_generic_handle_state_change(struct dasd_device *device)
1094 /* First of all start sense subsystem status request. */
1095 dasd_eer_snss(device);
1097 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1098 dasd_schedule_device_bh(device);
1100 dasd_schedule_block_bh(device->block);
1104 * Interrupt handler for "normal" ssch-io based dasd devices.
1106 void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1109 struct dasd_ccw_req *cqr, *next;
1110 struct dasd_device *device;
1111 unsigned long long now;
1114 kstat_cpu(smp_processor_id()).irqs[IOINT_DAS]++;
1116 switch (PTR_ERR(irb)) {
1120 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1121 "request timed out\n", __func__);
1124 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1125 "unknown error %ld\n", __func__,
1128 dasd_handle_killed_request(cdev, intparm);
1133 cqr = (struct dasd_ccw_req *) intparm;
1134 /* check for conditions that should be handled immediately */
1136 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1137 scsw_cstat(&irb->scsw) == 0)) {
1139 memcpy(&cqr->irb, irb, sizeof(*irb));
1140 device = dasd_device_from_cdev_locked(cdev);
1143 /* ignore unsolicited interrupts for DIAG discipline */
1144 if (device->discipline == dasd_diag_discipline_pointer) {
1145 dasd_put_device(device);
1148 device->discipline->dump_sense_dbf(device, irb, "int");
1149 if (device->features & DASD_FEATURE_ERPLOG)
1150 device->discipline->dump_sense(device, cqr, irb);
1151 device->discipline->check_for_device_change(device, cqr, irb);
1152 dasd_put_device(device);
1157 device = (struct dasd_device *) cqr->startdev;
1159 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
1160 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1161 "invalid device in request");
1165 /* Check for clear pending */
1166 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
1167 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
1168 cqr->status = DASD_CQR_CLEARED;
1169 dasd_device_clear_timer(device);
1170 wake_up(&dasd_flush_wq);
1171 dasd_schedule_device_bh(device);
1175 /* check status - the request might have been killed by dyn detach */
1176 if (cqr->status != DASD_CQR_IN_IO) {
1177 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1178 "status %02x", dev_name(&cdev->dev), cqr->status);
1184 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1185 scsw_cstat(&irb->scsw) == 0) {
1186 /* request was completed successfully */
1187 cqr->status = DASD_CQR_SUCCESS;
1189 /* Start first request on queue if possible -> fast_io. */
1190 if (cqr->devlist.next != &device->ccw_queue) {
1191 next = list_entry(cqr->devlist.next,
1192 struct dasd_ccw_req, devlist);
1194 } else { /* error */
1196 * If we don't want complex ERP for this request, then just
1197 * reset this and retry it in the fastpath
1199 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
1201 if (cqr->lpm == device->path_data.opm)
1202 DBF_DEV_EVENT(DBF_DEBUG, device,
1203 "default ERP in fastpath "
1204 "(%i retries left)",
1206 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
1207 cqr->lpm = device->path_data.opm;
1208 cqr->status = DASD_CQR_QUEUED;
1211 cqr->status = DASD_CQR_ERROR;
1213 if (next && (next->status == DASD_CQR_QUEUED) &&
1214 (!device->stopped)) {
1215 if (device->discipline->start_IO(next) == 0)
1216 expires = next->expires;
1219 dasd_device_set_timer(device, expires);
1221 dasd_device_clear_timer(device);
1222 dasd_schedule_device_bh(device);
1225 enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
1227 struct dasd_device *device;
1229 device = dasd_device_from_cdev_locked(cdev);
1233 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1234 device->state != device->target ||
1235 !device->discipline->check_for_device_change){
1236 dasd_put_device(device);
1239 if (device->discipline->dump_sense_dbf)
1240 device->discipline->dump_sense_dbf(device, irb, "uc");
1241 device->discipline->check_for_device_change(device, NULL, irb);
1242 dasd_put_device(device);
1244 return UC_TODO_RETRY;
1246 EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
1249 * If we have an error on a dasd_block layer request then we cancel
1250 * and return all further requests from the same dasd_block as well.
1252 static void __dasd_device_recovery(struct dasd_device *device,
1253 struct dasd_ccw_req *ref_cqr)
1255 struct list_head *l, *n;
1256 struct dasd_ccw_req *cqr;
1259 * only requeue request that came from the dasd_block layer
1261 if (!ref_cqr->block)
1264 list_for_each_safe(l, n, &device->ccw_queue) {
1265 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1266 if (cqr->status == DASD_CQR_QUEUED &&
1267 ref_cqr->block == cqr->block) {
1268 cqr->status = DASD_CQR_CLEARED;
1274 * Remove those ccw requests from the queue that need to be returned
1275 * to the upper layer.
1277 static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1278 struct list_head *final_queue)
1280 struct list_head *l, *n;
1281 struct dasd_ccw_req *cqr;
1283 /* Process request with final status. */
1284 list_for_each_safe(l, n, &device->ccw_queue) {
1285 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1287 /* Stop list processing at the first non-final request. */
1288 if (cqr->status == DASD_CQR_QUEUED ||
1289 cqr->status == DASD_CQR_IN_IO ||
1290 cqr->status == DASD_CQR_CLEAR_PENDING)
1292 if (cqr->status == DASD_CQR_ERROR) {
1293 __dasd_device_recovery(device, cqr);
1295 /* Rechain finished requests to final queue */
1296 list_move_tail(&cqr->devlist, final_queue);
1301 * the cqrs from the final queue are returned to the upper layer
1302 * by setting a dasd_block state and calling the callback function
1304 static void __dasd_device_process_final_queue(struct dasd_device *device,
1305 struct list_head *final_queue)
1307 struct list_head *l, *n;
1308 struct dasd_ccw_req *cqr;
1309 struct dasd_block *block;
1310 void (*callback)(struct dasd_ccw_req *, void *data);
1311 void *callback_data;
1312 char errorstring[ERRORLENGTH];
1314 list_for_each_safe(l, n, final_queue) {
1315 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1316 list_del_init(&cqr->devlist);
1318 callback = cqr->callback;
1319 callback_data = cqr->callback_data;
1321 spin_lock_bh(&block->queue_lock);
1322 switch (cqr->status) {
1323 case DASD_CQR_SUCCESS:
1324 cqr->status = DASD_CQR_DONE;
1326 case DASD_CQR_ERROR:
1327 cqr->status = DASD_CQR_NEED_ERP;
1329 case DASD_CQR_CLEARED:
1330 cqr->status = DASD_CQR_TERMINATED;
1333 /* internal error 12 - wrong cqr status*/
1334 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1335 dev_err(&device->cdev->dev,
1336 "An error occurred in the DASD device driver, "
1337 "reason=%s\n", errorstring);
1340 if (cqr->callback != NULL)
1341 (callback)(cqr, callback_data);
1343 spin_unlock_bh(&block->queue_lock);
1348 * Take a look at the first request on the ccw queue and check
1349 * if it reached its expire time. If so, terminate the IO.
1351 static void __dasd_device_check_expire(struct dasd_device *device)
1353 struct dasd_ccw_req *cqr;
1355 if (list_empty(&device->ccw_queue))
1357 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1358 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1359 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
1360 if (device->discipline->term_IO(cqr) != 0) {
1361 /* Hmpf, try again in 5 sec */
1362 dev_err(&device->cdev->dev,
1363 "cqr %p timed out (%lus) but cannot be "
1364 "ended, retrying in 5 s\n",
1365 cqr, (cqr->expires/HZ));
1366 cqr->expires += 5*HZ;
1367 dasd_device_set_timer(device, 5*HZ);
1369 dev_err(&device->cdev->dev,
1370 "cqr %p timed out (%lus), %i retries "
1371 "remaining\n", cqr, (cqr->expires/HZ),
1378 * Take a look at the first request on the ccw queue and check
1379 * if it needs to be started.
1381 static void __dasd_device_start_head(struct dasd_device *device)
1383 struct dasd_ccw_req *cqr;
1386 if (list_empty(&device->ccw_queue))
1388 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1389 if (cqr->status != DASD_CQR_QUEUED)
1391 /* when device is stopped, return request to previous layer
1392 * exception: only the disconnect or unresumed bits are set and the
1393 * cqr is a path verification request
1395 if (device->stopped &&
1396 !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
1397 && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) {
1398 cqr->intrc = -EAGAIN;
1399 cqr->status = DASD_CQR_CLEARED;
1400 dasd_schedule_device_bh(device);
1404 rc = device->discipline->start_IO(cqr);
1406 dasd_device_set_timer(device, cqr->expires);
1407 else if (rc == -EACCES) {
1408 dasd_schedule_device_bh(device);
1410 /* Hmpf, try again in 1/2 sec */
1411 dasd_device_set_timer(device, 50);
1414 static void __dasd_device_check_path_events(struct dasd_device *device)
1418 if (device->path_data.tbvpm) {
1419 if (device->stopped & ~(DASD_STOPPED_DC_WAIT |
1422 rc = device->discipline->verify_path(
1423 device, device->path_data.tbvpm);
1425 dasd_device_set_timer(device, 50);
1427 device->path_data.tbvpm = 0;
1432 * Go through all request on the dasd_device request queue,
1433 * terminate them on the cdev if necessary, and return them to the
1434 * submitting layer via callback.
1436 * Make sure that all 'submitting layers' still exist when
1437 * this function is called!. In other words, when 'device' is a base
1438 * device then all block layer requests must have been removed before
1439 * via dasd_flush_block_queue.
1441 int dasd_flush_device_queue(struct dasd_device *device)
1443 struct dasd_ccw_req *cqr, *n;
1445 struct list_head flush_queue;
1447 INIT_LIST_HEAD(&flush_queue);
1448 spin_lock_irq(get_ccwdev_lock(device->cdev));
1450 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
1451 /* Check status and move request to flush_queue */
1452 switch (cqr->status) {
1453 case DASD_CQR_IN_IO:
1454 rc = device->discipline->term_IO(cqr);
1456 /* unable to terminate requeust */
1457 dev_err(&device->cdev->dev,
1458 "Flushing the DASD request queue "
1459 "failed for request %p\n", cqr);
1460 /* stop flush processing */
1464 case DASD_CQR_QUEUED:
1465 cqr->stopclk = get_clock();
1466 cqr->status = DASD_CQR_CLEARED;
1468 default: /* no need to modify the others */
1471 list_move_tail(&cqr->devlist, &flush_queue);
1474 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1476 * After this point all requests must be in state CLEAR_PENDING,
1477 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
1478 * one of the others.
1480 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
1481 wait_event(dasd_flush_wq,
1482 (cqr->status != DASD_CQR_CLEAR_PENDING));
1484 * Now set each request back to TERMINATED, DONE or NEED_ERP
1485 * and call the callback function of flushed requests
1487 __dasd_device_process_final_queue(device, &flush_queue);
1492 * Acquire the device lock and process queues for the device.
1494 static void dasd_device_tasklet(struct dasd_device *device)
1496 struct list_head final_queue;
1498 atomic_set (&device->tasklet_scheduled, 0);
1499 INIT_LIST_HEAD(&final_queue);
1500 spin_lock_irq(get_ccwdev_lock(device->cdev));
1501 /* Check expire time of first request on the ccw queue. */
1502 __dasd_device_check_expire(device);
1503 /* find final requests on ccw queue */
1504 __dasd_device_process_ccw_queue(device, &final_queue);
1505 __dasd_device_check_path_events(device);
1506 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1507 /* Now call the callback function of requests with final status */
1508 __dasd_device_process_final_queue(device, &final_queue);
1509 spin_lock_irq(get_ccwdev_lock(device->cdev));
1510 /* Now check if the head of the ccw queue needs to be started. */
1511 __dasd_device_start_head(device);
1512 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1513 dasd_put_device(device);
1517 * Schedules a call to dasd_tasklet over the device tasklet.
1519 void dasd_schedule_device_bh(struct dasd_device *device)
1521 /* Protect against rescheduling. */
1522 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
1524 dasd_get_device(device);
1525 tasklet_hi_schedule(&device->tasklet);
1528 void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
1530 device->stopped |= bits;
1532 EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
1534 void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
1536 device->stopped &= ~bits;
1537 if (!device->stopped)
1538 wake_up(&generic_waitq);
1540 EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
1543 * Queue a request to the head of the device ccw_queue.
1544 * Start the I/O if possible.
1546 void dasd_add_request_head(struct dasd_ccw_req *cqr)
1548 struct dasd_device *device;
1549 unsigned long flags;
1551 device = cqr->startdev;
1552 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1553 cqr->status = DASD_CQR_QUEUED;
1554 list_add(&cqr->devlist, &device->ccw_queue);
1555 /* let the bh start the request to keep them in order */
1556 dasd_schedule_device_bh(device);
1557 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1561 * Queue a request to the tail of the device ccw_queue.
1562 * Start the I/O if possible.
1564 void dasd_add_request_tail(struct dasd_ccw_req *cqr)
1566 struct dasd_device *device;
1567 unsigned long flags;
1569 device = cqr->startdev;
1570 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1571 cqr->status = DASD_CQR_QUEUED;
1572 list_add_tail(&cqr->devlist, &device->ccw_queue);
1573 /* let the bh start the request to keep them in order */
1574 dasd_schedule_device_bh(device);
1575 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1579 * Wakeup helper for the 'sleep_on' functions.
1581 static void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
1583 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
1584 cqr->callback_data = DASD_SLEEPON_END_TAG;
1585 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
1586 wake_up(&generic_waitq);
1589 static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
1591 struct dasd_device *device;
1594 device = cqr->startdev;
1595 spin_lock_irq(get_ccwdev_lock(device->cdev));
1596 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
1597 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1602 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
1604 static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
1606 struct dasd_device *device;
1607 dasd_erp_fn_t erp_fn;
1609 if (cqr->status == DASD_CQR_FILLED)
1611 device = cqr->startdev;
1612 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
1613 if (cqr->status == DASD_CQR_TERMINATED) {
1614 device->discipline->handle_terminated_request(cqr);
1617 if (cqr->status == DASD_CQR_NEED_ERP) {
1618 erp_fn = device->discipline->erp_action(cqr);
1622 if (cqr->status == DASD_CQR_FAILED)
1623 dasd_log_sense(cqr, &cqr->irb);
1625 __dasd_process_erp(device, cqr);
1632 static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
1634 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
1635 if (cqr->refers) /* erp is not done yet */
1637 return ((cqr->status != DASD_CQR_DONE) &&
1638 (cqr->status != DASD_CQR_FAILED));
1640 return (cqr->status == DASD_CQR_FILLED);
1643 static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
1645 struct dasd_device *device;
1647 struct list_head ccw_queue;
1648 struct dasd_ccw_req *cqr;
1650 INIT_LIST_HEAD(&ccw_queue);
1651 maincqr->status = DASD_CQR_FILLED;
1652 device = maincqr->startdev;
1653 list_add(&maincqr->blocklist, &ccw_queue);
1654 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
1655 cqr = list_first_entry(&ccw_queue,
1656 struct dasd_ccw_req, blocklist)) {
1658 if (__dasd_sleep_on_erp(cqr))
1660 if (cqr->status != DASD_CQR_FILLED) /* could be failed */
1662 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
1663 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1664 cqr->status = DASD_CQR_FAILED;
1665 cqr->intrc = -EPERM;
1668 /* Non-temporary stop condition will trigger fail fast */
1669 if (device->stopped & ~DASD_STOPPED_PENDING &&
1670 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
1671 (!dasd_eer_enabled(device))) {
1672 cqr->status = DASD_CQR_FAILED;
1675 /* Don't try to start requests if device is stopped */
1676 if (interruptible) {
1677 rc = wait_event_interruptible(
1678 generic_waitq, !(device->stopped));
1679 if (rc == -ERESTARTSYS) {
1680 cqr->status = DASD_CQR_FAILED;
1681 maincqr->intrc = rc;
1685 wait_event(generic_waitq, !(device->stopped));
1687 cqr->callback = dasd_wakeup_cb;
1688 cqr->callback_data = DASD_SLEEPON_START_TAG;
1689 dasd_add_request_tail(cqr);
1690 if (interruptible) {
1691 rc = wait_event_interruptible(
1692 generic_waitq, _wait_for_wakeup(cqr));
1693 if (rc == -ERESTARTSYS) {
1694 dasd_cancel_req(cqr);
1695 /* wait (non-interruptible) for final status */
1696 wait_event(generic_waitq,
1697 _wait_for_wakeup(cqr));
1698 cqr->status = DASD_CQR_FAILED;
1699 maincqr->intrc = rc;
1703 wait_event(generic_waitq, _wait_for_wakeup(cqr));
1706 maincqr->endclk = get_clock();
1707 if ((maincqr->status != DASD_CQR_DONE) &&
1708 (maincqr->intrc != -ERESTARTSYS))
1709 dasd_log_sense(maincqr, &maincqr->irb);
1710 if (maincqr->status == DASD_CQR_DONE)
1712 else if (maincqr->intrc)
1713 rc = maincqr->intrc;
1720 * Queue a request to the tail of the device ccw_queue and wait for
1723 int dasd_sleep_on(struct dasd_ccw_req *cqr)
1725 return _dasd_sleep_on(cqr, 0);
1729 * Queue a request to the tail of the device ccw_queue and wait
1730 * interruptible for it's completion.
1732 int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
1734 return _dasd_sleep_on(cqr, 1);
1738 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
1739 * for eckd devices) the currently running request has to be terminated
1740 * and be put back to status queued, before the special request is added
1741 * to the head of the queue. Then the special request is waited on normally.
1743 static inline int _dasd_term_running_cqr(struct dasd_device *device)
1745 struct dasd_ccw_req *cqr;
1747 if (list_empty(&device->ccw_queue))
1749 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1750 return device->discipline->term_IO(cqr);
1753 int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
1755 struct dasd_device *device;
1758 device = cqr->startdev;
1759 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
1760 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1761 cqr->status = DASD_CQR_FAILED;
1762 cqr->intrc = -EPERM;
1765 spin_lock_irq(get_ccwdev_lock(device->cdev));
1766 rc = _dasd_term_running_cqr(device);
1768 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1771 cqr->callback = dasd_wakeup_cb;
1772 cqr->callback_data = DASD_SLEEPON_START_TAG;
1773 cqr->status = DASD_CQR_QUEUED;
1774 list_add(&cqr->devlist, &device->ccw_queue);
1776 /* let the bh start the request to keep them in order */
1777 dasd_schedule_device_bh(device);
1779 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1781 wait_event(generic_waitq, _wait_for_wakeup(cqr));
1783 if (cqr->status == DASD_CQR_DONE)
1785 else if (cqr->intrc)
1793 * Cancels a request that was started with dasd_sleep_on_req.
1794 * This is useful to timeout requests. The request will be
1795 * terminated if it is currently in i/o.
1796 * Returns 1 if the request has been terminated.
1797 * 0 if there was no need to terminate the request (not started yet)
1798 * negative error code if termination failed
1799 * Cancellation of a request is an asynchronous operation! The calling
1800 * function has to wait until the request is properly returned via callback.
1802 int dasd_cancel_req(struct dasd_ccw_req *cqr)
1804 struct dasd_device *device = cqr->startdev;
1805 unsigned long flags;
1809 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1810 switch (cqr->status) {
1811 case DASD_CQR_QUEUED:
1812 /* request was not started - just set to cleared */
1813 cqr->status = DASD_CQR_CLEARED;
1815 case DASD_CQR_IN_IO:
1816 /* request in IO - terminate IO and release again */
1817 rc = device->discipline->term_IO(cqr);
1819 dev_err(&device->cdev->dev,
1820 "Cancelling request %p failed with rc=%d\n",
1823 cqr->stopclk = get_clock();
1826 default: /* already finished or clear pending - do nothing */
1829 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1830 dasd_schedule_device_bh(device);
1836 * SECTION: Operations of the dasd_block layer.
1840 * Timeout function for dasd_block. This is used when the block layer
1841 * is waiting for something that may not come reliably, (e.g. a state
1844 static void dasd_block_timeout(unsigned long ptr)
1846 unsigned long flags;
1847 struct dasd_block *block;
1849 block = (struct dasd_block *) ptr;
1850 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
1851 /* re-activate request queue */
1852 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
1853 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
1854 dasd_schedule_block_bh(block);
1858 * Setup timeout for a dasd_block in jiffies.
1860 void dasd_block_set_timer(struct dasd_block *block, int expires)
1863 del_timer(&block->timer);
1865 mod_timer(&block->timer, jiffies + expires);
1869 * Clear timeout for a dasd_block.
1871 void dasd_block_clear_timer(struct dasd_block *block)
1873 del_timer(&block->timer);
1877 * Process finished error recovery ccw.
1879 static void __dasd_process_erp(struct dasd_device *device,
1880 struct dasd_ccw_req *cqr)
1882 dasd_erp_fn_t erp_fn;
1884 if (cqr->status == DASD_CQR_DONE)
1885 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
1887 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
1888 erp_fn = device->discipline->erp_postaction(cqr);
1893 * Fetch requests from the block device queue.
1895 static void __dasd_process_request_queue(struct dasd_block *block)
1897 struct request_queue *queue;
1898 struct request *req;
1899 struct dasd_ccw_req *cqr;
1900 struct dasd_device *basedev;
1901 unsigned long flags;
1902 queue = block->request_queue;
1903 basedev = block->base;
1904 /* No queue ? Then there is nothing to do. */
1909 * We requeue request from the block device queue to the ccw
1910 * queue only in two states. In state DASD_STATE_READY the
1911 * partition detection is done and we need to requeue requests
1912 * for that. State DASD_STATE_ONLINE is normal block device
1915 if (basedev->state < DASD_STATE_READY) {
1916 while ((req = blk_fetch_request(block->request_queue)))
1917 __blk_end_request_all(req, -EIO);
1920 /* Now we try to fetch requests from the request queue */
1921 while (!blk_queue_plugged(queue) && (req = blk_peek_request(queue))) {
1922 if (basedev->features & DASD_FEATURE_READONLY &&
1923 rq_data_dir(req) == WRITE) {
1924 DBF_DEV_EVENT(DBF_ERR, basedev,
1925 "Rejecting write request %p",
1927 blk_start_request(req);
1928 __blk_end_request_all(req, -EIO);
1931 cqr = basedev->discipline->build_cp(basedev, block, req);
1933 if (PTR_ERR(cqr) == -EBUSY)
1934 break; /* normal end condition */
1935 if (PTR_ERR(cqr) == -ENOMEM)
1936 break; /* terminate request queue loop */
1937 if (PTR_ERR(cqr) == -EAGAIN) {
1939 * The current request cannot be build right
1940 * now, we have to try later. If this request
1941 * is the head-of-queue we stop the device
1944 if (!list_empty(&block->ccw_queue))
1947 get_ccwdev_lock(basedev->cdev), flags);
1948 dasd_device_set_stop_bits(basedev,
1949 DASD_STOPPED_PENDING);
1950 spin_unlock_irqrestore(
1951 get_ccwdev_lock(basedev->cdev), flags);
1952 dasd_block_set_timer(block, HZ/2);
1955 DBF_DEV_EVENT(DBF_ERR, basedev,
1956 "CCW creation failed (rc=%ld) "
1959 blk_start_request(req);
1960 __blk_end_request_all(req, -EIO);
1964 * Note: callback is set to dasd_return_cqr_cb in
1965 * __dasd_block_start_head to cover erp requests as well
1967 cqr->callback_data = (void *) req;
1968 cqr->status = DASD_CQR_FILLED;
1969 blk_start_request(req);
1970 list_add_tail(&cqr->blocklist, &block->ccw_queue);
1971 dasd_profile_start(block, cqr, req);
1975 static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
1977 struct request *req;
1981 req = (struct request *) cqr->callback_data;
1982 dasd_profile_end(cqr->block, cqr, req);
1983 status = cqr->block->base->discipline->free_cp(cqr, req);
1985 error = status ? status : -EIO;
1986 __blk_end_request_all(req, error);
1990 * Process ccw request queue.
1992 static void __dasd_process_block_ccw_queue(struct dasd_block *block,
1993 struct list_head *final_queue)
1995 struct list_head *l, *n;
1996 struct dasd_ccw_req *cqr;
1997 dasd_erp_fn_t erp_fn;
1998 unsigned long flags;
1999 struct dasd_device *base = block->base;
2002 /* Process request with final status. */
2003 list_for_each_safe(l, n, &block->ccw_queue) {
2004 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2005 if (cqr->status != DASD_CQR_DONE &&
2006 cqr->status != DASD_CQR_FAILED &&
2007 cqr->status != DASD_CQR_NEED_ERP &&
2008 cqr->status != DASD_CQR_TERMINATED)
2011 if (cqr->status == DASD_CQR_TERMINATED) {
2012 base->discipline->handle_terminated_request(cqr);
2016 /* Process requests that may be recovered */
2017 if (cqr->status == DASD_CQR_NEED_ERP) {
2018 erp_fn = base->discipline->erp_action(cqr);
2019 if (IS_ERR(erp_fn(cqr)))
2024 /* log sense for fatal error */
2025 if (cqr->status == DASD_CQR_FAILED) {
2026 dasd_log_sense(cqr, &cqr->irb);
2029 /* First of all call extended error reporting. */
2030 if (dasd_eer_enabled(base) &&
2031 cqr->status == DASD_CQR_FAILED) {
2032 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
2034 /* restart request */
2035 cqr->status = DASD_CQR_FILLED;
2037 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
2038 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
2039 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
2044 /* Process finished ERP request. */
2046 __dasd_process_erp(base, cqr);
2050 /* Rechain finished requests to final queue */
2051 cqr->endclk = get_clock();
2052 list_move_tail(&cqr->blocklist, final_queue);
2056 static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
2058 dasd_schedule_block_bh(cqr->block);
2061 static void __dasd_block_start_head(struct dasd_block *block)
2063 struct dasd_ccw_req *cqr;
2065 if (list_empty(&block->ccw_queue))
2067 /* We allways begin with the first requests on the queue, as some
2068 * of previously started requests have to be enqueued on a
2069 * dasd_device again for error recovery.
2071 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
2072 if (cqr->status != DASD_CQR_FILLED)
2074 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
2075 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2076 cqr->status = DASD_CQR_FAILED;
2077 cqr->intrc = -EPERM;
2078 dasd_schedule_block_bh(block);
2081 /* Non-temporary stop condition will trigger fail fast */
2082 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
2083 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2084 (!dasd_eer_enabled(block->base))) {
2085 cqr->status = DASD_CQR_FAILED;
2086 dasd_schedule_block_bh(block);
2089 /* Don't try to start requests if device is stopped */
2090 if (block->base->stopped)
2093 /* just a fail safe check, should not happen */
2095 cqr->startdev = block->base;
2097 /* make sure that the requests we submit find their way back */
2098 cqr->callback = dasd_return_cqr_cb;
2100 dasd_add_request_tail(cqr);
2105 * Central dasd_block layer routine. Takes requests from the generic
2106 * block layer request queue, creates ccw requests, enqueues them on
2107 * a dasd_device and processes ccw requests that have been returned.
2109 static void dasd_block_tasklet(struct dasd_block *block)
2111 struct list_head final_queue;
2112 struct list_head *l, *n;
2113 struct dasd_ccw_req *cqr;
2115 atomic_set(&block->tasklet_scheduled, 0);
2116 INIT_LIST_HEAD(&final_queue);
2117 spin_lock(&block->queue_lock);
2118 /* Finish off requests on ccw queue */
2119 __dasd_process_block_ccw_queue(block, &final_queue);
2120 spin_unlock(&block->queue_lock);
2121 /* Now call the callback function of requests with final status */
2122 spin_lock_irq(&block->request_queue_lock);
2123 list_for_each_safe(l, n, &final_queue) {
2124 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2125 list_del_init(&cqr->blocklist);
2126 __dasd_cleanup_cqr(cqr);
2128 spin_lock(&block->queue_lock);
2129 /* Get new request from the block device request queue */
2130 __dasd_process_request_queue(block);
2131 /* Now check if the head of the ccw queue needs to be started. */
2132 __dasd_block_start_head(block);
2133 spin_unlock(&block->queue_lock);
2134 spin_unlock_irq(&block->request_queue_lock);
2135 dasd_put_device(block->base);
2138 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2140 wake_up(&dasd_flush_wq);
2144 * Go through all request on the dasd_block request queue, cancel them
2145 * on the respective dasd_device, and return them to the generic
2148 static int dasd_flush_block_queue(struct dasd_block *block)
2150 struct dasd_ccw_req *cqr, *n;
2152 struct list_head flush_queue;
2154 INIT_LIST_HEAD(&flush_queue);
2155 spin_lock_bh(&block->queue_lock);
2158 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2159 /* if this request currently owned by a dasd_device cancel it */
2160 if (cqr->status >= DASD_CQR_QUEUED)
2161 rc = dasd_cancel_req(cqr);
2164 /* Rechain request (including erp chain) so it won't be
2165 * touched by the dasd_block_tasklet anymore.
2166 * Replace the callback so we notice when the request
2167 * is returned from the dasd_device layer.
2169 cqr->callback = _dasd_wake_block_flush_cb;
2170 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2171 list_move_tail(&cqr->blocklist, &flush_queue);
2173 /* moved more than one request - need to restart */
2176 spin_unlock_bh(&block->queue_lock);
2177 /* Now call the callback function of flushed requests */
2179 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
2180 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
2181 /* Process finished ERP request. */
2183 spin_lock_bh(&block->queue_lock);
2184 __dasd_process_erp(block->base, cqr);
2185 spin_unlock_bh(&block->queue_lock);
2186 /* restart list_for_xx loop since dasd_process_erp
2187 * might remove multiple elements */
2190 /* call the callback function */
2191 spin_lock_irq(&block->request_queue_lock);
2192 cqr->endclk = get_clock();
2193 list_del_init(&cqr->blocklist);
2194 __dasd_cleanup_cqr(cqr);
2195 spin_unlock_irq(&block->request_queue_lock);
2201 * Schedules a call to dasd_tasklet over the device tasklet.
2203 void dasd_schedule_block_bh(struct dasd_block *block)
2205 /* Protect against rescheduling. */
2206 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
2208 /* life cycle of block is bound to it's base device */
2209 dasd_get_device(block->base);
2210 tasklet_hi_schedule(&block->tasklet);
2215 * SECTION: external block device operations
2216 * (request queue handling, open, release, etc.)
2220 * Dasd request queue function. Called from ll_rw_blk.c
2222 static void do_dasd_request(struct request_queue *queue)
2224 struct dasd_block *block;
2226 block = queue->queuedata;
2227 spin_lock(&block->queue_lock);
2228 /* Get new request from the block device request queue */
2229 __dasd_process_request_queue(block);
2230 /* Now check if the head of the ccw queue needs to be started. */
2231 __dasd_block_start_head(block);
2232 spin_unlock(&block->queue_lock);
2236 * Allocate and initialize request queue and default I/O scheduler.
2238 static int dasd_alloc_queue(struct dasd_block *block)
2242 block->request_queue = blk_init_queue(do_dasd_request,
2243 &block->request_queue_lock);
2244 if (block->request_queue == NULL)
2247 block->request_queue->queuedata = block;
2249 elevator_exit(block->request_queue->elevator);
2250 block->request_queue->elevator = NULL;
2251 rc = elevator_init(block->request_queue, "deadline");
2253 blk_cleanup_queue(block->request_queue);
2260 * Allocate and initialize request queue.
2262 static void dasd_setup_queue(struct dasd_block *block)
2266 if (block->base->features & DASD_FEATURE_USERAW) {
2268 * the max_blocks value for raw_track access is 256
2269 * it is higher than the native ECKD value because we
2270 * only need one ccw per track
2271 * so the max_hw_sectors are
2272 * 2048 x 512B = 1024kB = 16 tracks
2276 max = block->base->discipline->max_blocks << block->s2b_shift;
2278 blk_queue_logical_block_size(block->request_queue,
2280 blk_queue_max_hw_sectors(block->request_queue, max);
2281 blk_queue_max_segments(block->request_queue, -1L);
2282 /* with page sized segments we can translate each segement into
2285 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
2286 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
2290 * Deactivate and free request queue.
2292 static void dasd_free_queue(struct dasd_block *block)
2294 if (block->request_queue) {
2295 blk_cleanup_queue(block->request_queue);
2296 block->request_queue = NULL;
2301 * Flush request on the request queue.
2303 static void dasd_flush_request_queue(struct dasd_block *block)
2305 struct request *req;
2307 if (!block->request_queue)
2310 spin_lock_irq(&block->request_queue_lock);
2311 while ((req = blk_fetch_request(block->request_queue)))
2312 __blk_end_request_all(req, -EIO);
2313 spin_unlock_irq(&block->request_queue_lock);
2316 static int dasd_open(struct block_device *bdev, fmode_t mode)
2318 struct dasd_block *block = bdev->bd_disk->private_data;
2319 struct dasd_device *base;
2326 atomic_inc(&block->open_count);
2327 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
2332 if (!try_module_get(base->discipline->owner)) {
2337 if (dasd_probeonly) {
2338 dev_info(&base->cdev->dev,
2339 "Accessing the DASD failed because it is in "
2340 "probeonly mode\n");
2345 if (base->state <= DASD_STATE_BASIC) {
2346 DBF_DEV_EVENT(DBF_ERR, base, " %s",
2347 " Cannot open unrecognized device");
2352 if ((mode & FMODE_WRITE) &&
2353 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
2354 (base->features & DASD_FEATURE_READONLY))) {
2362 module_put(base->discipline->owner);
2364 atomic_dec(&block->open_count);
2368 static int dasd_release(struct gendisk *disk, fmode_t mode)
2370 struct dasd_block *block = disk->private_data;
2372 atomic_dec(&block->open_count);
2373 module_put(block->base->discipline->owner);
2378 * Return disk geometry.
2380 static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
2382 struct dasd_block *block;
2383 struct dasd_device *base;
2385 block = bdev->bd_disk->private_data;
2390 if (!base->discipline ||
2391 !base->discipline->fill_geometry)
2394 base->discipline->fill_geometry(block, geo);
2395 geo->start = get_start_sect(bdev) >> block->s2b_shift;
2399 const struct block_device_operations
2400 dasd_device_operations = {
2401 .owner = THIS_MODULE,
2403 .release = dasd_release,
2404 .ioctl = dasd_ioctl,
2405 .compat_ioctl = dasd_ioctl,
2406 .getgeo = dasd_getgeo,
2409 /*******************************************************************************
2410 * end of block device operations
2416 #ifdef CONFIG_PROC_FS
2420 if (dasd_page_cache != NULL) {
2421 kmem_cache_destroy(dasd_page_cache);
2422 dasd_page_cache = NULL;
2424 dasd_gendisk_exit();
2426 if (dasd_debug_area != NULL) {
2427 debug_unregister(dasd_debug_area);
2428 dasd_debug_area = NULL;
2433 * SECTION: common functions for ccw_driver use
2437 * Is the device read-only?
2438 * Note that this function does not report the setting of the
2439 * readonly device attribute, but how it is configured in z/VM.
2441 int dasd_device_is_ro(struct dasd_device *device)
2443 struct ccw_dev_id dev_id;
2444 struct diag210 diag_data;
2449 ccw_device_get_id(device->cdev, &dev_id);
2450 memset(&diag_data, 0, sizeof(diag_data));
2451 diag_data.vrdcdvno = dev_id.devno;
2452 diag_data.vrdclen = sizeof(diag_data);
2453 rc = diag210(&diag_data);
2454 if (rc == 0 || rc == 2) {
2455 return diag_data.vrdcvfla & 0x80;
2457 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
2462 EXPORT_SYMBOL_GPL(dasd_device_is_ro);
2464 static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
2466 struct ccw_device *cdev = data;
2469 ret = ccw_device_set_online(cdev);
2471 pr_warning("%s: Setting the DASD online failed with rc=%d\n",
2472 dev_name(&cdev->dev), ret);
2476 * Initial attempt at a probe function. this can be simplified once
2477 * the other detection code is gone.
2479 int dasd_generic_probe(struct ccw_device *cdev,
2480 struct dasd_discipline *discipline)
2484 ret = dasd_add_sysfs_files(cdev);
2486 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
2487 "dasd_generic_probe: could not add "
2491 cdev->handler = &dasd_int_handler;
2494 * Automatically online either all dasd devices (dasd_autodetect)
2495 * or all devices specified with dasd= parameters during
2498 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
2499 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
2500 async_schedule(dasd_generic_auto_online, cdev);
2505 * This will one day be called from a global not_oper handler.
2506 * It is also used by driver_unregister during module unload.
2508 void dasd_generic_remove(struct ccw_device *cdev)
2510 struct dasd_device *device;
2511 struct dasd_block *block;
2513 cdev->handler = NULL;
2515 dasd_remove_sysfs_files(cdev);
2516 device = dasd_device_from_cdev(cdev);
2519 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
2520 /* Already doing offline processing */
2521 dasd_put_device(device);
2525 * This device is removed unconditionally. Set offline
2526 * flag to prevent dasd_open from opening it while it is
2527 * no quite down yet.
2529 dasd_set_target_state(device, DASD_STATE_NEW);
2530 /* dasd_delete_device destroys the device reference. */
2531 block = device->block;
2532 device->block = NULL;
2533 dasd_delete_device(device);
2535 * life cycle of block is bound to device, so delete it after
2536 * device was safely removed
2539 dasd_free_block(block);
2543 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
2544 * the device is detected for the first time and is supposed to be used
2545 * or the user has started activation through sysfs.
2547 int dasd_generic_set_online(struct ccw_device *cdev,
2548 struct dasd_discipline *base_discipline)
2550 struct dasd_discipline *discipline;
2551 struct dasd_device *device;
2554 /* first online clears initial online feature flag */
2555 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
2556 device = dasd_create_device(cdev);
2558 return PTR_ERR(device);
2560 discipline = base_discipline;
2561 if (device->features & DASD_FEATURE_USEDIAG) {
2562 if (!dasd_diag_discipline_pointer) {
2563 pr_warning("%s Setting the DASD online failed because "
2564 "of missing DIAG discipline\n",
2565 dev_name(&cdev->dev));
2566 dasd_delete_device(device);
2569 discipline = dasd_diag_discipline_pointer;
2571 if (!try_module_get(base_discipline->owner)) {
2572 dasd_delete_device(device);
2575 if (!try_module_get(discipline->owner)) {
2576 module_put(base_discipline->owner);
2577 dasd_delete_device(device);
2580 device->base_discipline = base_discipline;
2581 device->discipline = discipline;
2583 /* check_device will allocate block device if necessary */
2584 rc = discipline->check_device(device);
2586 pr_warning("%s Setting the DASD online with discipline %s "
2587 "failed with rc=%i\n",
2588 dev_name(&cdev->dev), discipline->name, rc);
2589 module_put(discipline->owner);
2590 module_put(base_discipline->owner);
2591 dasd_delete_device(device);
2595 dasd_set_target_state(device, DASD_STATE_ONLINE);
2596 if (device->state <= DASD_STATE_KNOWN) {
2597 pr_warning("%s Setting the DASD online failed because of a "
2598 "missing discipline\n", dev_name(&cdev->dev));
2600 dasd_set_target_state(device, DASD_STATE_NEW);
2602 dasd_free_block(device->block);
2603 dasd_delete_device(device);
2605 pr_debug("dasd_generic device %s found\n",
2606 dev_name(&cdev->dev));
2608 wait_event(dasd_init_waitq, _wait_for_device(device));
2610 dasd_put_device(device);
2614 int dasd_generic_set_offline(struct ccw_device *cdev)
2616 struct dasd_device *device;
2617 struct dasd_block *block;
2618 int max_count, open_count;
2620 device = dasd_device_from_cdev(cdev);
2622 return PTR_ERR(device);
2623 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
2624 /* Already doing offline processing */
2625 dasd_put_device(device);
2629 * We must make sure that this device is currently not in use.
2630 * The open_count is increased for every opener, that includes
2631 * the blkdev_get in dasd_scan_partitions. We are only interested
2632 * in the other openers.
2634 if (device->block) {
2635 max_count = device->block->bdev ? 0 : -1;
2636 open_count = atomic_read(&device->block->open_count);
2637 if (open_count > max_count) {
2639 pr_warning("%s: The DASD cannot be set offline "
2640 "with open count %i\n",
2641 dev_name(&cdev->dev), open_count);
2643 pr_warning("%s: The DASD cannot be set offline "
2644 "while it is in use\n",
2645 dev_name(&cdev->dev));
2646 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
2647 dasd_put_device(device);
2651 dasd_set_target_state(device, DASD_STATE_NEW);
2652 /* dasd_delete_device destroys the device reference. */
2653 block = device->block;
2654 device->block = NULL;
2655 dasd_delete_device(device);
2657 * life cycle of block is bound to device, so delete it after
2658 * device was safely removed
2661 dasd_free_block(block);
2665 int dasd_generic_last_path_gone(struct dasd_device *device)
2667 struct dasd_ccw_req *cqr;
2669 dev_warn(&device->cdev->dev, "No operational channel path is left "
2670 "for the device\n");
2671 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
2672 /* First of all call extended error reporting. */
2673 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
2675 if (device->state < DASD_STATE_BASIC)
2677 /* Device is active. We want to keep it. */
2678 list_for_each_entry(cqr, &device->ccw_queue, devlist)
2679 if ((cqr->status == DASD_CQR_IN_IO) ||
2680 (cqr->status == DASD_CQR_CLEAR_PENDING)) {
2681 cqr->status = DASD_CQR_QUEUED;
2684 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
2685 dasd_device_clear_timer(device);
2686 dasd_schedule_device_bh(device);
2689 EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
2691 int dasd_generic_path_operational(struct dasd_device *device)
2693 dev_info(&device->cdev->dev, "A channel path to the device has become "
2695 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
2696 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
2697 if (device->stopped & DASD_UNRESUMED_PM) {
2698 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
2699 dasd_restore_device(device);
2702 dasd_schedule_device_bh(device);
2704 dasd_schedule_block_bh(device->block);
2707 EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
2709 int dasd_generic_notify(struct ccw_device *cdev, int event)
2711 struct dasd_device *device;
2714 device = dasd_device_from_cdev_locked(cdev);
2722 device->path_data.opm = 0;
2723 device->path_data.ppm = 0;
2724 device->path_data.npm = 0;
2725 ret = dasd_generic_last_path_gone(device);
2729 if (device->path_data.opm)
2730 ret = dasd_generic_path_operational(device);
2733 dasd_put_device(device);
2737 void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
2740 __u8 oldopm, eventlpm;
2741 struct dasd_device *device;
2743 device = dasd_device_from_cdev_locked(cdev);
2746 for (chp = 0; chp < 8; chp++) {
2747 eventlpm = 0x80 >> chp;
2748 if (path_event[chp] & PE_PATH_GONE) {
2749 oldopm = device->path_data.opm;
2750 device->path_data.opm &= ~eventlpm;
2751 device->path_data.ppm &= ~eventlpm;
2752 device->path_data.npm &= ~eventlpm;
2753 if (oldopm && !device->path_data.opm)
2754 dasd_generic_last_path_gone(device);
2756 if (path_event[chp] & PE_PATH_AVAILABLE) {
2757 device->path_data.opm &= ~eventlpm;
2758 device->path_data.ppm &= ~eventlpm;
2759 device->path_data.npm &= ~eventlpm;
2760 device->path_data.tbvpm |= eventlpm;
2761 dasd_schedule_device_bh(device);
2764 dasd_put_device(device);
2766 EXPORT_SYMBOL_GPL(dasd_generic_path_event);
2768 int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
2770 if (!device->path_data.opm && lpm) {
2771 device->path_data.opm = lpm;
2772 dasd_generic_path_operational(device);
2774 device->path_data.opm |= lpm;
2777 EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
2780 int dasd_generic_pm_freeze(struct ccw_device *cdev)
2782 struct dasd_ccw_req *cqr, *n;
2784 struct list_head freeze_queue;
2785 struct dasd_device *device = dasd_device_from_cdev(cdev);
2788 return PTR_ERR(device);
2790 if (device->discipline->freeze)
2791 rc = device->discipline->freeze(device);
2793 /* disallow new I/O */
2794 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
2795 /* clear active requests */
2796 INIT_LIST_HEAD(&freeze_queue);
2797 spin_lock_irq(get_ccwdev_lock(cdev));
2799 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
2800 /* Check status and move request to flush_queue */
2801 if (cqr->status == DASD_CQR_IN_IO) {
2802 rc = device->discipline->term_IO(cqr);
2804 /* unable to terminate requeust */
2805 dev_err(&device->cdev->dev,
2806 "Unable to terminate request %p "
2807 "on suspend\n", cqr);
2808 spin_unlock_irq(get_ccwdev_lock(cdev));
2809 dasd_put_device(device);
2813 list_move_tail(&cqr->devlist, &freeze_queue);
2816 spin_unlock_irq(get_ccwdev_lock(cdev));
2818 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
2819 wait_event(dasd_flush_wq,
2820 (cqr->status != DASD_CQR_CLEAR_PENDING));
2821 if (cqr->status == DASD_CQR_CLEARED)
2822 cqr->status = DASD_CQR_QUEUED;
2824 /* move freeze_queue to start of the ccw_queue */
2825 spin_lock_irq(get_ccwdev_lock(cdev));
2826 list_splice_tail(&freeze_queue, &device->ccw_queue);
2827 spin_unlock_irq(get_ccwdev_lock(cdev));
2829 dasd_put_device(device);
2832 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
2834 int dasd_generic_restore_device(struct ccw_device *cdev)
2836 struct dasd_device *device = dasd_device_from_cdev(cdev);
2840 return PTR_ERR(device);
2842 /* allow new IO again */
2843 dasd_device_remove_stop_bits(device,
2844 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
2846 dasd_schedule_device_bh(device);
2849 * call discipline restore function
2850 * if device is stopped do nothing e.g. for disconnected devices
2852 if (device->discipline->restore && !(device->stopped))
2853 rc = device->discipline->restore(device);
2854 if (rc || device->stopped)
2856 * if the resume failed for the DASD we put it in
2857 * an UNRESUMED stop state
2859 device->stopped |= DASD_UNRESUMED_PM;
2862 dasd_schedule_block_bh(device->block);
2864 dasd_put_device(device);
2867 EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
2869 static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
2871 int rdc_buffer_size,
2874 struct dasd_ccw_req *cqr;
2876 unsigned long *idaw;
2878 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
2881 /* internal error 13 - Allocating the RDC request failed*/
2882 dev_err(&device->cdev->dev,
2883 "An error occurred in the DASD device driver, "
2884 "reason=%s\n", "13");
2889 ccw->cmd_code = CCW_CMD_RDC;
2890 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
2891 idaw = (unsigned long *) (cqr->data);
2892 ccw->cda = (__u32)(addr_t) idaw;
2893 ccw->flags = CCW_FLAG_IDA;
2894 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
2896 ccw->cda = (__u32)(addr_t) rdc_buffer;
2900 ccw->count = rdc_buffer_size;
2901 cqr->startdev = device;
2902 cqr->memdev = device;
2903 cqr->expires = 10*HZ;
2905 cqr->buildclk = get_clock();
2906 cqr->status = DASD_CQR_FILLED;
2911 int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
2912 void *rdc_buffer, int rdc_buffer_size)
2915 struct dasd_ccw_req *cqr;
2917 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
2920 return PTR_ERR(cqr);
2922 ret = dasd_sleep_on(cqr);
2923 dasd_sfree_request(cqr, cqr->memdev);
2926 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
2929 * In command mode and transport mode we need to look for sense
2930 * data in different places. The sense data itself is allways
2931 * an array of 32 bytes, so we can unify the sense data access
2934 char *dasd_get_sense(struct irb *irb)
2936 struct tsb *tsb = NULL;
2939 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
2940 if (irb->scsw.tm.tcw)
2941 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
2943 if (tsb && tsb->length == 64 && tsb->flags)
2944 switch (tsb->flags & 0x07) {
2945 case 1: /* tsa_iostat */
2946 sense = tsb->tsa.iostat.sense;
2948 case 2: /* tsa_ddpc */
2949 sense = tsb->tsa.ddpc.sense;
2952 /* currently we don't use interrogate data */
2955 } else if (irb->esw.esw0.erw.cons) {
2960 EXPORT_SYMBOL_GPL(dasd_get_sense);
2962 static int __init dasd_init(void)
2966 init_waitqueue_head(&dasd_init_waitq);
2967 init_waitqueue_head(&dasd_flush_wq);
2968 init_waitqueue_head(&generic_waitq);
2970 /* register 'common' DASD debug area, used for all DBF_XXX calls */
2971 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
2972 if (dasd_debug_area == NULL) {
2976 debug_register_view(dasd_debug_area, &debug_sprintf_view);
2977 debug_set_level(dasd_debug_area, DBF_WARNING);
2979 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
2981 dasd_diag_discipline_pointer = NULL;
2983 rc = dasd_devmap_init();
2986 rc = dasd_gendisk_init();
2992 rc = dasd_eer_init();
2995 #ifdef CONFIG_PROC_FS
2996 rc = dasd_proc_init();
3003 pr_info("The DASD device driver could not be initialized\n");
3008 module_init(dasd_init);
3009 module_exit(dasd_exit);
3011 EXPORT_SYMBOL(dasd_debug_area);
3012 EXPORT_SYMBOL(dasd_diag_discipline_pointer);
3014 EXPORT_SYMBOL(dasd_add_request_head);
3015 EXPORT_SYMBOL(dasd_add_request_tail);
3016 EXPORT_SYMBOL(dasd_cancel_req);
3017 EXPORT_SYMBOL(dasd_device_clear_timer);
3018 EXPORT_SYMBOL(dasd_block_clear_timer);
3019 EXPORT_SYMBOL(dasd_enable_device);
3020 EXPORT_SYMBOL(dasd_int_handler);
3021 EXPORT_SYMBOL(dasd_kfree_request);
3022 EXPORT_SYMBOL(dasd_kick_device);
3023 EXPORT_SYMBOL(dasd_kmalloc_request);
3024 EXPORT_SYMBOL(dasd_schedule_device_bh);
3025 EXPORT_SYMBOL(dasd_schedule_block_bh);
3026 EXPORT_SYMBOL(dasd_set_target_state);
3027 EXPORT_SYMBOL(dasd_device_set_timer);
3028 EXPORT_SYMBOL(dasd_block_set_timer);
3029 EXPORT_SYMBOL(dasd_sfree_request);
3030 EXPORT_SYMBOL(dasd_sleep_on);
3031 EXPORT_SYMBOL(dasd_sleep_on_immediatly);
3032 EXPORT_SYMBOL(dasd_sleep_on_interruptible);
3033 EXPORT_SYMBOL(dasd_smalloc_request);
3034 EXPORT_SYMBOL(dasd_start_IO);
3035 EXPORT_SYMBOL(dasd_term_IO);
3037 EXPORT_SYMBOL_GPL(dasd_generic_probe);
3038 EXPORT_SYMBOL_GPL(dasd_generic_remove);
3039 EXPORT_SYMBOL_GPL(dasd_generic_notify);
3040 EXPORT_SYMBOL_GPL(dasd_generic_set_online);
3041 EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
3042 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
3043 EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
3044 EXPORT_SYMBOL_GPL(dasd_alloc_block);
3045 EXPORT_SYMBOL_GPL(dasd_free_block);