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>
23 #include <linux/mutex.h>
25 #include <asm/ccwdev.h>
26 #include <asm/ebcdic.h>
27 #include <asm/idals.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);
67 static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *);
70 * SECTION: Operations on the device structure.
72 static wait_queue_head_t dasd_init_waitq;
73 static wait_queue_head_t dasd_flush_wq;
74 static wait_queue_head_t generic_waitq;
77 * Allocate memory for a new device structure.
79 struct dasd_device *dasd_alloc_device(void)
81 struct dasd_device *device;
83 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC);
85 return ERR_PTR(-ENOMEM);
87 /* Get two pages for normal block device operations. */
88 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
89 if (!device->ccw_mem) {
91 return ERR_PTR(-ENOMEM);
93 /* Get one page for error recovery. */
94 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
95 if (!device->erp_mem) {
96 free_pages((unsigned long) device->ccw_mem, 1);
98 return ERR_PTR(-ENOMEM);
101 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
102 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
103 spin_lock_init(&device->mem_lock);
104 atomic_set(&device->tasklet_scheduled, 0);
105 tasklet_init(&device->tasklet,
106 (void (*)(unsigned long)) dasd_device_tasklet,
107 (unsigned long) device);
108 INIT_LIST_HEAD(&device->ccw_queue);
109 init_timer(&device->timer);
110 device->timer.function = dasd_device_timeout;
111 device->timer.data = (unsigned long) device;
112 INIT_WORK(&device->kick_work, do_kick_device);
113 INIT_WORK(&device->restore_device, do_restore_device);
114 device->state = DASD_STATE_NEW;
115 device->target = DASD_STATE_NEW;
116 mutex_init(&device->state_mutex);
122 * Free memory of a device structure.
124 void dasd_free_device(struct dasd_device *device)
126 kfree(device->private);
127 free_page((unsigned long) device->erp_mem);
128 free_pages((unsigned long) device->ccw_mem, 1);
133 * Allocate memory for a new device structure.
135 struct dasd_block *dasd_alloc_block(void)
137 struct dasd_block *block;
139 block = kzalloc(sizeof(*block), GFP_ATOMIC);
141 return ERR_PTR(-ENOMEM);
142 /* open_count = 0 means device online but not in use */
143 atomic_set(&block->open_count, -1);
145 spin_lock_init(&block->request_queue_lock);
146 atomic_set(&block->tasklet_scheduled, 0);
147 tasklet_init(&block->tasklet,
148 (void (*)(unsigned long)) dasd_block_tasklet,
149 (unsigned long) block);
150 INIT_LIST_HEAD(&block->ccw_queue);
151 spin_lock_init(&block->queue_lock);
152 init_timer(&block->timer);
153 block->timer.function = dasd_block_timeout;
154 block->timer.data = (unsigned long) block;
160 * Free memory of a device structure.
162 void dasd_free_block(struct dasd_block *block)
168 * Make a new device known to the system.
170 static int dasd_state_new_to_known(struct dasd_device *device)
175 * As long as the device is not in state DASD_STATE_NEW we want to
176 * keep the reference count > 0.
178 dasd_get_device(device);
181 rc = dasd_alloc_queue(device->block);
183 dasd_put_device(device);
187 device->state = DASD_STATE_KNOWN;
192 * Let the system forget about a device.
194 static int dasd_state_known_to_new(struct dasd_device *device)
196 /* Disable extended error reporting for this device. */
197 dasd_eer_disable(device);
198 /* Forget the discipline information. */
199 if (device->discipline) {
200 if (device->discipline->uncheck_device)
201 device->discipline->uncheck_device(device);
202 module_put(device->discipline->owner);
204 device->discipline = NULL;
205 if (device->base_discipline)
206 module_put(device->base_discipline->owner);
207 device->base_discipline = NULL;
208 device->state = DASD_STATE_NEW;
211 dasd_free_queue(device->block);
213 /* Give up reference we took in dasd_state_new_to_known. */
214 dasd_put_device(device);
219 * Request the irq line for the device.
221 static int dasd_state_known_to_basic(struct dasd_device *device)
225 /* Allocate and register gendisk structure. */
227 rc = dasd_gendisk_alloc(device->block);
231 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
232 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1,
234 debug_register_view(device->debug_area, &debug_sprintf_view);
235 debug_set_level(device->debug_area, DBF_WARNING);
236 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
238 device->state = DASD_STATE_BASIC;
243 * Release the irq line for the device. Terminate any running i/o.
245 static int dasd_state_basic_to_known(struct dasd_device *device)
249 dasd_gendisk_free(device->block);
250 dasd_block_clear_timer(device->block);
252 rc = dasd_flush_device_queue(device);
255 dasd_device_clear_timer(device);
257 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
258 if (device->debug_area != NULL) {
259 debug_unregister(device->debug_area);
260 device->debug_area = NULL;
262 device->state = DASD_STATE_KNOWN;
267 * Do the initial analysis. The do_analysis function may return
268 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
269 * until the discipline decides to continue the startup sequence
270 * by calling the function dasd_change_state. The eckd disciplines
271 * uses this to start a ccw that detects the format. The completion
272 * interrupt for this detection ccw uses the kernel event daemon to
273 * trigger the call to dasd_change_state. All this is done in the
274 * discipline code, see dasd_eckd.c.
275 * After the analysis ccw is done (do_analysis returned 0) the block
277 * In case the analysis returns an error, the device setup is stopped
278 * (a fake disk was already added to allow formatting).
280 static int dasd_state_basic_to_ready(struct dasd_device *device)
283 struct dasd_block *block;
286 block = device->block;
287 /* make disk known with correct capacity */
289 if (block->base->discipline->do_analysis != NULL)
290 rc = block->base->discipline->do_analysis(block);
293 device->state = DASD_STATE_UNFMT;
296 dasd_setup_queue(block);
297 set_capacity(block->gdp,
298 block->blocks << block->s2b_shift);
299 device->state = DASD_STATE_READY;
300 rc = dasd_scan_partitions(block);
302 device->state = DASD_STATE_BASIC;
304 device->state = DASD_STATE_READY;
310 * Remove device from block device layer. Destroy dirty buffers.
311 * Forget format information. Check if the target level is basic
312 * and if it is create fake disk for formatting.
314 static int dasd_state_ready_to_basic(struct dasd_device *device)
318 device->state = DASD_STATE_BASIC;
320 struct dasd_block *block = device->block;
321 rc = dasd_flush_block_queue(block);
323 device->state = DASD_STATE_READY;
326 dasd_flush_request_queue(block);
327 dasd_destroy_partitions(block);
330 block->s2b_shift = 0;
338 static int dasd_state_unfmt_to_basic(struct dasd_device *device)
340 device->state = DASD_STATE_BASIC;
345 * Make the device online and schedule the bottom half to start
346 * the requeueing of requests from the linux request queue to the
350 dasd_state_ready_to_online(struct dasd_device * device)
353 struct gendisk *disk;
354 struct disk_part_iter piter;
355 struct hd_struct *part;
357 if (device->discipline->ready_to_online) {
358 rc = device->discipline->ready_to_online(device);
362 device->state = DASD_STATE_ONLINE;
364 dasd_schedule_block_bh(device->block);
365 disk = device->block->bdev->bd_disk;
366 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
367 while ((part = disk_part_iter_next(&piter)))
368 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
369 disk_part_iter_exit(&piter);
375 * Stop the requeueing of requests again.
377 static int dasd_state_online_to_ready(struct dasd_device *device)
380 struct gendisk *disk;
381 struct disk_part_iter piter;
382 struct hd_struct *part;
384 if (device->discipline->online_to_ready) {
385 rc = device->discipline->online_to_ready(device);
389 device->state = DASD_STATE_READY;
391 disk = device->block->bdev->bd_disk;
392 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
393 while ((part = disk_part_iter_next(&piter)))
394 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
395 disk_part_iter_exit(&piter);
401 * Device startup state changes.
403 static int dasd_increase_state(struct dasd_device *device)
408 if (device->state == DASD_STATE_NEW &&
409 device->target >= DASD_STATE_KNOWN)
410 rc = dasd_state_new_to_known(device);
413 device->state == DASD_STATE_KNOWN &&
414 device->target >= DASD_STATE_BASIC)
415 rc = dasd_state_known_to_basic(device);
418 device->state == DASD_STATE_BASIC &&
419 device->target >= DASD_STATE_READY)
420 rc = dasd_state_basic_to_ready(device);
423 device->state == DASD_STATE_UNFMT &&
424 device->target > DASD_STATE_UNFMT)
428 device->state == DASD_STATE_READY &&
429 device->target >= DASD_STATE_ONLINE)
430 rc = dasd_state_ready_to_online(device);
436 * Device shutdown state changes.
438 static int dasd_decrease_state(struct dasd_device *device)
443 if (device->state == DASD_STATE_ONLINE &&
444 device->target <= DASD_STATE_READY)
445 rc = dasd_state_online_to_ready(device);
448 device->state == DASD_STATE_READY &&
449 device->target <= DASD_STATE_BASIC)
450 rc = dasd_state_ready_to_basic(device);
453 device->state == DASD_STATE_UNFMT &&
454 device->target <= DASD_STATE_BASIC)
455 rc = dasd_state_unfmt_to_basic(device);
458 device->state == DASD_STATE_BASIC &&
459 device->target <= DASD_STATE_KNOWN)
460 rc = dasd_state_basic_to_known(device);
463 device->state == DASD_STATE_KNOWN &&
464 device->target <= DASD_STATE_NEW)
465 rc = dasd_state_known_to_new(device);
471 * This is the main startup/shutdown routine.
473 static void dasd_change_state(struct dasd_device *device)
477 if (device->state == device->target)
478 /* Already where we want to go today... */
480 if (device->state < device->target)
481 rc = dasd_increase_state(device);
483 rc = dasd_decrease_state(device);
487 device->target = device->state;
489 if (device->state == device->target)
490 wake_up(&dasd_init_waitq);
492 /* let user-space know that the device status changed */
493 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
497 * Kick starter for devices that did not complete the startup/shutdown
498 * procedure or were sleeping because of a pending state.
499 * dasd_kick_device will schedule a call do do_kick_device to the kernel
502 static void do_kick_device(struct work_struct *work)
504 struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
505 mutex_lock(&device->state_mutex);
506 dasd_change_state(device);
507 mutex_unlock(&device->state_mutex);
508 dasd_schedule_device_bh(device);
509 dasd_put_device(device);
512 void dasd_kick_device(struct dasd_device *device)
514 dasd_get_device(device);
515 /* queue call to dasd_kick_device to the kernel event daemon. */
516 schedule_work(&device->kick_work);
520 * dasd_restore_device will schedule a call do do_restore_device to the kernel
523 static void do_restore_device(struct work_struct *work)
525 struct dasd_device *device = container_of(work, struct dasd_device,
527 device->cdev->drv->restore(device->cdev);
528 dasd_put_device(device);
531 void dasd_restore_device(struct dasd_device *device)
533 dasd_get_device(device);
534 /* queue call to dasd_restore_device to the kernel event daemon. */
535 schedule_work(&device->restore_device);
539 * Set the target state for a device and starts the state change.
541 void dasd_set_target_state(struct dasd_device *device, int target)
543 dasd_get_device(device);
544 mutex_lock(&device->state_mutex);
545 /* If we are in probeonly mode stop at DASD_STATE_READY. */
546 if (dasd_probeonly && target > DASD_STATE_READY)
547 target = DASD_STATE_READY;
548 if (device->target != target) {
549 if (device->state == target)
550 wake_up(&dasd_init_waitq);
551 device->target = target;
553 if (device->state != device->target)
554 dasd_change_state(device);
555 mutex_unlock(&device->state_mutex);
556 dasd_put_device(device);
560 * Enable devices with device numbers in [from..to].
562 static inline int _wait_for_device(struct dasd_device *device)
564 return (device->state == device->target);
567 void dasd_enable_device(struct dasd_device *device)
569 dasd_set_target_state(device, DASD_STATE_ONLINE);
570 if (device->state <= DASD_STATE_KNOWN)
571 /* No discipline for device found. */
572 dasd_set_target_state(device, DASD_STATE_NEW);
573 /* Now wait for the devices to come up. */
574 wait_event(dasd_init_waitq, _wait_for_device(device));
578 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
580 #ifdef CONFIG_DASD_PROFILE
582 struct dasd_profile_info_t dasd_global_profile;
583 unsigned int dasd_profile_level = DASD_PROFILE_OFF;
586 * Increments counter in global and local profiling structures.
588 #define dasd_profile_counter(value, counter, block) \
591 for (index = 0; index < 31 && value >> (2+index); index++); \
592 dasd_global_profile.counter[index]++; \
593 block->profile.counter[index]++; \
597 * Add profiling information for cqr before execution.
599 static void dasd_profile_start(struct dasd_block *block,
600 struct dasd_ccw_req *cqr,
604 unsigned int counter;
606 if (dasd_profile_level != DASD_PROFILE_ON)
609 /* count the length of the chanq for statistics */
611 list_for_each(l, &block->ccw_queue)
614 dasd_global_profile.dasd_io_nr_req[counter]++;
615 block->profile.dasd_io_nr_req[counter]++;
619 * Add profiling information for cqr after execution.
621 static void dasd_profile_end(struct dasd_block *block,
622 struct dasd_ccw_req *cqr,
625 long strtime, irqtime, endtime, tottime; /* in microseconds */
626 long tottimeps, sectors;
628 if (dasd_profile_level != DASD_PROFILE_ON)
631 sectors = blk_rq_sectors(req);
632 if (!cqr->buildclk || !cqr->startclk ||
633 !cqr->stopclk || !cqr->endclk ||
637 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
638 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
639 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
640 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
641 tottimeps = tottime / sectors;
643 if (!dasd_global_profile.dasd_io_reqs)
644 memset(&dasd_global_profile, 0,
645 sizeof(struct dasd_profile_info_t));
646 dasd_global_profile.dasd_io_reqs++;
647 dasd_global_profile.dasd_io_sects += sectors;
649 if (!block->profile.dasd_io_reqs)
650 memset(&block->profile, 0,
651 sizeof(struct dasd_profile_info_t));
652 block->profile.dasd_io_reqs++;
653 block->profile.dasd_io_sects += sectors;
655 dasd_profile_counter(sectors, dasd_io_secs, block);
656 dasd_profile_counter(tottime, dasd_io_times, block);
657 dasd_profile_counter(tottimeps, dasd_io_timps, block);
658 dasd_profile_counter(strtime, dasd_io_time1, block);
659 dasd_profile_counter(irqtime, dasd_io_time2, block);
660 dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, block);
661 dasd_profile_counter(endtime, dasd_io_time3, block);
664 #define dasd_profile_start(block, cqr, req) do {} while (0)
665 #define dasd_profile_end(block, cqr, req) do {} while (0)
666 #endif /* CONFIG_DASD_PROFILE */
669 * Allocate memory for a channel program with 'cplength' channel
670 * command words and 'datasize' additional space. There are two
671 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
672 * memory and 2) dasd_smalloc_request uses the static ccw memory
673 * that gets allocated for each device.
675 struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
677 struct dasd_device *device)
679 struct dasd_ccw_req *cqr;
682 BUG_ON(datasize > PAGE_SIZE ||
683 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
685 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
687 return ERR_PTR(-ENOMEM);
690 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
691 GFP_ATOMIC | GFP_DMA);
692 if (cqr->cpaddr == NULL) {
694 return ERR_PTR(-ENOMEM);
699 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
700 if (cqr->data == NULL) {
703 return ERR_PTR(-ENOMEM);
707 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
708 dasd_get_device(device);
712 struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
714 struct dasd_device *device)
717 struct dasd_ccw_req *cqr;
722 BUG_ON(datasize > PAGE_SIZE ||
723 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
725 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
727 size += cplength * sizeof(struct ccw1);
730 spin_lock_irqsave(&device->mem_lock, flags);
731 cqr = (struct dasd_ccw_req *)
732 dasd_alloc_chunk(&device->ccw_chunks, size);
733 spin_unlock_irqrestore(&device->mem_lock, flags);
735 return ERR_PTR(-ENOMEM);
736 memset(cqr, 0, sizeof(struct dasd_ccw_req));
737 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
740 cqr->cpaddr = (struct ccw1 *) data;
741 data += cplength*sizeof(struct ccw1);
742 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
747 memset(cqr->data, 0, datasize);
750 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
751 dasd_get_device(device);
756 * Free memory of a channel program. This function needs to free all the
757 * idal lists that might have been created by dasd_set_cda and the
758 * struct dasd_ccw_req itself.
760 void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
765 /* Clear any idals used for the request. */
768 clear_normalized_cda(ccw);
769 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
774 dasd_put_device(device);
777 void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
781 spin_lock_irqsave(&device->mem_lock, flags);
782 dasd_free_chunk(&device->ccw_chunks, cqr);
783 spin_unlock_irqrestore(&device->mem_lock, flags);
784 dasd_put_device(device);
788 * Check discipline magic in cqr.
790 static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
792 struct dasd_device *device;
796 device = cqr->startdev;
797 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
798 DBF_DEV_EVENT(DBF_WARNING, device,
799 " dasd_ccw_req 0x%08x magic doesn't match"
800 " discipline 0x%08x",
802 *(unsigned int *) device->discipline->name);
809 * Terminate the current i/o and set the request to clear_pending.
810 * Timer keeps device runnig.
811 * ccw_device_clear can fail if the i/o subsystem
814 int dasd_term_IO(struct dasd_ccw_req *cqr)
816 struct dasd_device *device;
818 char errorstring[ERRORLENGTH];
821 rc = dasd_check_cqr(cqr);
825 device = (struct dasd_device *) cqr->startdev;
826 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
827 rc = ccw_device_clear(device->cdev, (long) cqr);
829 case 0: /* termination successful */
831 cqr->status = DASD_CQR_CLEAR_PENDING;
832 cqr->stopclk = get_clock();
834 DBF_DEV_EVENT(DBF_DEBUG, device,
835 "terminate cqr %p successful",
839 DBF_DEV_EVENT(DBF_ERR, device, "%s",
840 "device gone, retry");
843 DBF_DEV_EVENT(DBF_ERR, device, "%s",
848 DBF_DEV_EVENT(DBF_ERR, device, "%s",
849 "device busy, retry later");
852 /* internal error 10 - unknown rc*/
853 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
854 dev_err(&device->cdev->dev, "An error occurred in the "
855 "DASD device driver, reason=%s\n", errorstring);
861 dasd_schedule_device_bh(device);
866 * Start the i/o. This start_IO can fail if the channel is really busy.
867 * In that case set up a timer to start the request later.
869 int dasd_start_IO(struct dasd_ccw_req *cqr)
871 struct dasd_device *device;
873 char errorstring[ERRORLENGTH];
876 rc = dasd_check_cqr(cqr);
881 device = (struct dasd_device *) cqr->startdev;
882 if (cqr->retries < 0) {
883 /* internal error 14 - start_IO run out of retries */
884 sprintf(errorstring, "14 %p", cqr);
885 dev_err(&device->cdev->dev, "An error occurred in the DASD "
886 "device driver, reason=%s\n", errorstring);
887 cqr->status = DASD_CQR_ERROR;
890 cqr->startclk = get_clock();
891 cqr->starttime = jiffies;
893 if (cqr->cpmode == 1) {
894 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
895 (long) cqr, cqr->lpm);
897 rc = ccw_device_start(device->cdev, cqr->cpaddr,
898 (long) cqr, cqr->lpm, 0);
902 cqr->status = DASD_CQR_IN_IO;
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 dasd_device_remove_stop_bits(device, 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_DEVID(DBF_DEBUG, cdev,
1001 "invalid status in handle_killed_request: "
1002 "%02x", cqr->status);
1006 device = dasd_device_from_cdev_locked(cdev);
1007 if (IS_ERR(device)) {
1008 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1009 "unable to get device from cdev");
1013 if (!cqr->startdev ||
1014 device != cqr->startdev ||
1015 strncmp(cqr->startdev->discipline->ebcname,
1016 (char *) &cqr->magic, 4)) {
1017 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1018 "invalid device in request");
1019 dasd_put_device(device);
1023 /* Schedule request to be retried. */
1024 cqr->status = DASD_CQR_QUEUED;
1026 dasd_device_clear_timer(device);
1027 dasd_schedule_device_bh(device);
1028 dasd_put_device(device);
1031 void dasd_generic_handle_state_change(struct dasd_device *device)
1033 /* First of all start sense subsystem status request. */
1034 dasd_eer_snss(device);
1036 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1037 dasd_schedule_device_bh(device);
1039 dasd_schedule_block_bh(device->block);
1043 * Interrupt handler for "normal" ssch-io based dasd devices.
1045 void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1048 struct dasd_ccw_req *cqr, *next;
1049 struct dasd_device *device;
1050 unsigned long long now;
1054 switch (PTR_ERR(irb)) {
1058 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1059 "request timed out\n", __func__);
1062 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1063 "unknown error %ld\n", __func__,
1066 dasd_handle_killed_request(cdev, intparm);
1072 /* check for unsolicited interrupts */
1073 cqr = (struct dasd_ccw_req *) intparm;
1074 if (!cqr || ((scsw_cc(&irb->scsw) == 1) &&
1075 (scsw_fctl(&irb->scsw) & SCSW_FCTL_START_FUNC) &&
1076 (scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))) {
1077 if (cqr && cqr->status == DASD_CQR_IN_IO)
1078 cqr->status = DASD_CQR_QUEUED;
1079 device = dasd_device_from_cdev_locked(cdev);
1080 if (!IS_ERR(device)) {
1081 dasd_device_clear_timer(device);
1082 device->discipline->handle_unsolicited_interrupt(device,
1084 dasd_put_device(device);
1089 device = (struct dasd_device *) cqr->startdev;
1091 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
1092 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1093 "invalid device in request");
1097 /* Check for clear pending */
1098 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
1099 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
1100 cqr->status = DASD_CQR_CLEARED;
1101 dasd_device_clear_timer(device);
1102 wake_up(&dasd_flush_wq);
1103 dasd_schedule_device_bh(device);
1107 /* check status - the request might have been killed by dyn detach */
1108 if (cqr->status != DASD_CQR_IN_IO) {
1109 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1110 "status %02x", dev_name(&cdev->dev), cqr->status);
1116 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1117 scsw_cstat(&irb->scsw) == 0) {
1118 /* request was completed successfully */
1119 cqr->status = DASD_CQR_SUCCESS;
1121 /* Start first request on queue if possible -> fast_io. */
1122 if (cqr->devlist.next != &device->ccw_queue) {
1123 next = list_entry(cqr->devlist.next,
1124 struct dasd_ccw_req, devlist);
1126 } else { /* error */
1127 memcpy(&cqr->irb, irb, sizeof(struct irb));
1128 /* log sense for every failed I/O to s390 debugfeature */
1129 dasd_log_sense_dbf(cqr, irb);
1130 if (device->features & DASD_FEATURE_ERPLOG) {
1131 dasd_log_sense(cqr, irb);
1135 * If we don't want complex ERP for this request, then just
1136 * reset this and retry it in the fastpath
1138 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
1140 if (cqr->lpm == LPM_ANYPATH)
1141 DBF_DEV_EVENT(DBF_DEBUG, device,
1142 "default ERP in fastpath "
1143 "(%i retries left)",
1145 cqr->lpm = LPM_ANYPATH;
1146 cqr->status = DASD_CQR_QUEUED;
1149 cqr->status = DASD_CQR_ERROR;
1151 if (next && (next->status == DASD_CQR_QUEUED) &&
1152 (!device->stopped)) {
1153 if (device->discipline->start_IO(next) == 0)
1154 expires = next->expires;
1157 dasd_device_set_timer(device, expires);
1159 dasd_device_clear_timer(device);
1160 dasd_schedule_device_bh(device);
1164 * If we have an error on a dasd_block layer request then we cancel
1165 * and return all further requests from the same dasd_block as well.
1167 static void __dasd_device_recovery(struct dasd_device *device,
1168 struct dasd_ccw_req *ref_cqr)
1170 struct list_head *l, *n;
1171 struct dasd_ccw_req *cqr;
1174 * only requeue request that came from the dasd_block layer
1176 if (!ref_cqr->block)
1179 list_for_each_safe(l, n, &device->ccw_queue) {
1180 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1181 if (cqr->status == DASD_CQR_QUEUED &&
1182 ref_cqr->block == cqr->block) {
1183 cqr->status = DASD_CQR_CLEARED;
1189 * Remove those ccw requests from the queue that need to be returned
1190 * to the upper layer.
1192 static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1193 struct list_head *final_queue)
1195 struct list_head *l, *n;
1196 struct dasd_ccw_req *cqr;
1198 /* Process request with final status. */
1199 list_for_each_safe(l, n, &device->ccw_queue) {
1200 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1202 /* Stop list processing at the first non-final request. */
1203 if (cqr->status == DASD_CQR_QUEUED ||
1204 cqr->status == DASD_CQR_IN_IO ||
1205 cqr->status == DASD_CQR_CLEAR_PENDING)
1207 if (cqr->status == DASD_CQR_ERROR) {
1208 __dasd_device_recovery(device, cqr);
1210 /* Rechain finished requests to final queue */
1211 list_move_tail(&cqr->devlist, final_queue);
1216 * the cqrs from the final queue are returned to the upper layer
1217 * by setting a dasd_block state and calling the callback function
1219 static void __dasd_device_process_final_queue(struct dasd_device *device,
1220 struct list_head *final_queue)
1222 struct list_head *l, *n;
1223 struct dasd_ccw_req *cqr;
1224 struct dasd_block *block;
1225 void (*callback)(struct dasd_ccw_req *, void *data);
1226 void *callback_data;
1227 char errorstring[ERRORLENGTH];
1229 list_for_each_safe(l, n, final_queue) {
1230 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1231 list_del_init(&cqr->devlist);
1233 callback = cqr->callback;
1234 callback_data = cqr->callback_data;
1236 spin_lock_bh(&block->queue_lock);
1237 switch (cqr->status) {
1238 case DASD_CQR_SUCCESS:
1239 cqr->status = DASD_CQR_DONE;
1241 case DASD_CQR_ERROR:
1242 cqr->status = DASD_CQR_NEED_ERP;
1244 case DASD_CQR_CLEARED:
1245 cqr->status = DASD_CQR_TERMINATED;
1248 /* internal error 12 - wrong cqr status*/
1249 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1250 dev_err(&device->cdev->dev,
1251 "An error occurred in the DASD device driver, "
1252 "reason=%s\n", errorstring);
1255 if (cqr->callback != NULL)
1256 (callback)(cqr, callback_data);
1258 spin_unlock_bh(&block->queue_lock);
1263 * Take a look at the first request on the ccw queue and check
1264 * if it reached its expire time. If so, terminate the IO.
1266 static void __dasd_device_check_expire(struct dasd_device *device)
1268 struct dasd_ccw_req *cqr;
1270 if (list_empty(&device->ccw_queue))
1272 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1273 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1274 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
1275 if (device->discipline->term_IO(cqr) != 0) {
1276 /* Hmpf, try again in 5 sec */
1277 dev_err(&device->cdev->dev,
1278 "cqr %p timed out (%is) but cannot be "
1279 "ended, retrying in 5 s\n",
1280 cqr, (cqr->expires/HZ));
1281 cqr->expires += 5*HZ;
1282 dasd_device_set_timer(device, 5*HZ);
1284 dev_err(&device->cdev->dev,
1285 "cqr %p timed out (%is), %i retries "
1286 "remaining\n", cqr, (cqr->expires/HZ),
1293 * Take a look at the first request on the ccw queue and check
1294 * if it needs to be started.
1296 static void __dasd_device_start_head(struct dasd_device *device)
1298 struct dasd_ccw_req *cqr;
1301 if (list_empty(&device->ccw_queue))
1303 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1304 if (cqr->status != DASD_CQR_QUEUED)
1306 /* when device is stopped, return request to previous layer */
1307 if (device->stopped) {
1308 cqr->status = DASD_CQR_CLEARED;
1309 dasd_schedule_device_bh(device);
1313 rc = device->discipline->start_IO(cqr);
1315 dasd_device_set_timer(device, cqr->expires);
1316 else if (rc == -EACCES) {
1317 dasd_schedule_device_bh(device);
1319 /* Hmpf, try again in 1/2 sec */
1320 dasd_device_set_timer(device, 50);
1324 * Go through all request on the dasd_device request queue,
1325 * terminate them on the cdev if necessary, and return them to the
1326 * submitting layer via callback.
1328 * Make sure that all 'submitting layers' still exist when
1329 * this function is called!. In other words, when 'device' is a base
1330 * device then all block layer requests must have been removed before
1331 * via dasd_flush_block_queue.
1333 int dasd_flush_device_queue(struct dasd_device *device)
1335 struct dasd_ccw_req *cqr, *n;
1337 struct list_head flush_queue;
1339 INIT_LIST_HEAD(&flush_queue);
1340 spin_lock_irq(get_ccwdev_lock(device->cdev));
1342 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
1343 /* Check status and move request to flush_queue */
1344 switch (cqr->status) {
1345 case DASD_CQR_IN_IO:
1346 rc = device->discipline->term_IO(cqr);
1348 /* unable to terminate requeust */
1349 dev_err(&device->cdev->dev,
1350 "Flushing the DASD request queue "
1351 "failed for request %p\n", cqr);
1352 /* stop flush processing */
1356 case DASD_CQR_QUEUED:
1357 cqr->stopclk = get_clock();
1358 cqr->status = DASD_CQR_CLEARED;
1360 default: /* no need to modify the others */
1363 list_move_tail(&cqr->devlist, &flush_queue);
1366 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1368 * After this point all requests must be in state CLEAR_PENDING,
1369 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
1370 * one of the others.
1372 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
1373 wait_event(dasd_flush_wq,
1374 (cqr->status != DASD_CQR_CLEAR_PENDING));
1376 * Now set each request back to TERMINATED, DONE or NEED_ERP
1377 * and call the callback function of flushed requests
1379 __dasd_device_process_final_queue(device, &flush_queue);
1384 * Acquire the device lock and process queues for the device.
1386 static void dasd_device_tasklet(struct dasd_device *device)
1388 struct list_head final_queue;
1390 atomic_set (&device->tasklet_scheduled, 0);
1391 INIT_LIST_HEAD(&final_queue);
1392 spin_lock_irq(get_ccwdev_lock(device->cdev));
1393 /* Check expire time of first request on the ccw queue. */
1394 __dasd_device_check_expire(device);
1395 /* find final requests on ccw queue */
1396 __dasd_device_process_ccw_queue(device, &final_queue);
1397 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1398 /* Now call the callback function of requests with final status */
1399 __dasd_device_process_final_queue(device, &final_queue);
1400 spin_lock_irq(get_ccwdev_lock(device->cdev));
1401 /* Now check if the head of the ccw queue needs to be started. */
1402 __dasd_device_start_head(device);
1403 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1404 dasd_put_device(device);
1408 * Schedules a call to dasd_tasklet over the device tasklet.
1410 void dasd_schedule_device_bh(struct dasd_device *device)
1412 /* Protect against rescheduling. */
1413 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
1415 dasd_get_device(device);
1416 tasklet_hi_schedule(&device->tasklet);
1419 void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
1421 device->stopped |= bits;
1423 EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
1425 void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
1427 device->stopped &= ~bits;
1428 if (!device->stopped)
1429 wake_up(&generic_waitq);
1431 EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
1434 * Queue a request to the head of the device ccw_queue.
1435 * Start the I/O if possible.
1437 void dasd_add_request_head(struct dasd_ccw_req *cqr)
1439 struct dasd_device *device;
1440 unsigned long flags;
1442 device = cqr->startdev;
1443 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1444 cqr->status = DASD_CQR_QUEUED;
1445 list_add(&cqr->devlist, &device->ccw_queue);
1446 /* let the bh start the request to keep them in order */
1447 dasd_schedule_device_bh(device);
1448 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1452 * Queue a request to the tail of the device ccw_queue.
1453 * Start the I/O if possible.
1455 void dasd_add_request_tail(struct dasd_ccw_req *cqr)
1457 struct dasd_device *device;
1458 unsigned long flags;
1460 device = cqr->startdev;
1461 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1462 cqr->status = DASD_CQR_QUEUED;
1463 list_add_tail(&cqr->devlist, &device->ccw_queue);
1464 /* let the bh start the request to keep them in order */
1465 dasd_schedule_device_bh(device);
1466 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1470 * Wakeup helper for the 'sleep_on' functions.
1472 static void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
1474 wake_up((wait_queue_head_t *) data);
1477 static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
1479 struct dasd_device *device;
1482 device = cqr->startdev;
1483 spin_lock_irq(get_ccwdev_lock(device->cdev));
1484 rc = ((cqr->status == DASD_CQR_DONE ||
1485 cqr->status == DASD_CQR_NEED_ERP ||
1486 cqr->status == DASD_CQR_TERMINATED) &&
1487 list_empty(&cqr->devlist));
1488 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1493 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
1495 static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
1497 struct dasd_device *device;
1498 dasd_erp_fn_t erp_fn;
1500 if (cqr->status == DASD_CQR_FILLED)
1502 device = cqr->startdev;
1503 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
1504 if (cqr->status == DASD_CQR_TERMINATED) {
1505 device->discipline->handle_terminated_request(cqr);
1508 if (cqr->status == DASD_CQR_NEED_ERP) {
1509 erp_fn = device->discipline->erp_action(cqr);
1513 if (cqr->status == DASD_CQR_FAILED)
1514 dasd_log_sense(cqr, &cqr->irb);
1516 __dasd_process_erp(device, cqr);
1523 static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
1525 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
1526 if (cqr->refers) /* erp is not done yet */
1528 return ((cqr->status != DASD_CQR_DONE) &&
1529 (cqr->status != DASD_CQR_FAILED));
1531 return (cqr->status == DASD_CQR_FILLED);
1534 static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
1536 struct dasd_device *device;
1538 struct list_head ccw_queue;
1539 struct dasd_ccw_req *cqr;
1541 INIT_LIST_HEAD(&ccw_queue);
1542 maincqr->status = DASD_CQR_FILLED;
1543 device = maincqr->startdev;
1544 list_add(&maincqr->blocklist, &ccw_queue);
1545 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
1546 cqr = list_first_entry(&ccw_queue,
1547 struct dasd_ccw_req, blocklist)) {
1549 if (__dasd_sleep_on_erp(cqr))
1551 if (cqr->status != DASD_CQR_FILLED) /* could be failed */
1554 /* Non-temporary stop condition will trigger fail fast */
1555 if (device->stopped & ~DASD_STOPPED_PENDING &&
1556 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
1557 (!dasd_eer_enabled(device))) {
1558 cqr->status = DASD_CQR_FAILED;
1562 /* Don't try to start requests if device is stopped */
1563 if (interruptible) {
1564 rc = wait_event_interruptible(
1565 generic_waitq, !(device->stopped));
1566 if (rc == -ERESTARTSYS) {
1567 cqr->status = DASD_CQR_FAILED;
1568 maincqr->intrc = rc;
1572 wait_event(generic_waitq, !(device->stopped));
1574 cqr->callback = dasd_wakeup_cb;
1575 cqr->callback_data = (void *) &generic_waitq;
1576 dasd_add_request_tail(cqr);
1577 if (interruptible) {
1578 rc = wait_event_interruptible(
1579 generic_waitq, _wait_for_wakeup(cqr));
1580 if (rc == -ERESTARTSYS) {
1581 dasd_cancel_req(cqr);
1582 /* wait (non-interruptible) for final status */
1583 wait_event(generic_waitq,
1584 _wait_for_wakeup(cqr));
1585 cqr->status = DASD_CQR_FAILED;
1586 maincqr->intrc = rc;
1590 wait_event(generic_waitq, _wait_for_wakeup(cqr));
1593 maincqr->endclk = get_clock();
1594 if ((maincqr->status != DASD_CQR_DONE) &&
1595 (maincqr->intrc != -ERESTARTSYS))
1596 dasd_log_sense(maincqr, &maincqr->irb);
1597 if (maincqr->status == DASD_CQR_DONE)
1599 else if (maincqr->intrc)
1600 rc = maincqr->intrc;
1607 * Queue a request to the tail of the device ccw_queue and wait for
1610 int dasd_sleep_on(struct dasd_ccw_req *cqr)
1612 return _dasd_sleep_on(cqr, 0);
1616 * Queue a request to the tail of the device ccw_queue and wait
1617 * interruptible for it's completion.
1619 int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
1621 return _dasd_sleep_on(cqr, 1);
1625 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
1626 * for eckd devices) the currently running request has to be terminated
1627 * and be put back to status queued, before the special request is added
1628 * to the head of the queue. Then the special request is waited on normally.
1630 static inline int _dasd_term_running_cqr(struct dasd_device *device)
1632 struct dasd_ccw_req *cqr;
1634 if (list_empty(&device->ccw_queue))
1636 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1637 return device->discipline->term_IO(cqr);
1640 int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
1642 struct dasd_device *device;
1645 device = cqr->startdev;
1646 spin_lock_irq(get_ccwdev_lock(device->cdev));
1647 rc = _dasd_term_running_cqr(device);
1649 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1653 cqr->callback = dasd_wakeup_cb;
1654 cqr->callback_data = (void *) &generic_waitq;
1655 cqr->status = DASD_CQR_QUEUED;
1656 list_add(&cqr->devlist, &device->ccw_queue);
1658 /* let the bh start the request to keep them in order */
1659 dasd_schedule_device_bh(device);
1661 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1663 wait_event(generic_waitq, _wait_for_wakeup(cqr));
1665 if (cqr->status == DASD_CQR_DONE)
1667 else if (cqr->intrc)
1675 * Cancels a request that was started with dasd_sleep_on_req.
1676 * This is useful to timeout requests. The request will be
1677 * terminated if it is currently in i/o.
1678 * Returns 1 if the request has been terminated.
1679 * 0 if there was no need to terminate the request (not started yet)
1680 * negative error code if termination failed
1681 * Cancellation of a request is an asynchronous operation! The calling
1682 * function has to wait until the request is properly returned via callback.
1684 int dasd_cancel_req(struct dasd_ccw_req *cqr)
1686 struct dasd_device *device = cqr->startdev;
1687 unsigned long flags;
1691 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1692 switch (cqr->status) {
1693 case DASD_CQR_QUEUED:
1694 /* request was not started - just set to cleared */
1695 cqr->status = DASD_CQR_CLEARED;
1697 case DASD_CQR_IN_IO:
1698 /* request in IO - terminate IO and release again */
1699 rc = device->discipline->term_IO(cqr);
1701 dev_err(&device->cdev->dev,
1702 "Cancelling request %p failed with rc=%d\n",
1705 cqr->stopclk = get_clock();
1708 default: /* already finished or clear pending - do nothing */
1711 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1712 dasd_schedule_device_bh(device);
1718 * SECTION: Operations of the dasd_block layer.
1722 * Timeout function for dasd_block. This is used when the block layer
1723 * is waiting for something that may not come reliably, (e.g. a state
1726 static void dasd_block_timeout(unsigned long ptr)
1728 unsigned long flags;
1729 struct dasd_block *block;
1731 block = (struct dasd_block *) ptr;
1732 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
1733 /* re-activate request queue */
1734 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
1735 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
1736 dasd_schedule_block_bh(block);
1740 * Setup timeout for a dasd_block in jiffies.
1742 void dasd_block_set_timer(struct dasd_block *block, int expires)
1745 del_timer(&block->timer);
1747 mod_timer(&block->timer, jiffies + expires);
1751 * Clear timeout for a dasd_block.
1753 void dasd_block_clear_timer(struct dasd_block *block)
1755 del_timer(&block->timer);
1759 * Process finished error recovery ccw.
1761 static void __dasd_process_erp(struct dasd_device *device,
1762 struct dasd_ccw_req *cqr)
1764 dasd_erp_fn_t erp_fn;
1766 if (cqr->status == DASD_CQR_DONE)
1767 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
1769 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
1770 erp_fn = device->discipline->erp_postaction(cqr);
1775 * Fetch requests from the block device queue.
1777 static void __dasd_process_request_queue(struct dasd_block *block)
1779 struct request_queue *queue;
1780 struct request *req;
1781 struct dasd_ccw_req *cqr;
1782 struct dasd_device *basedev;
1783 unsigned long flags;
1784 queue = block->request_queue;
1785 basedev = block->base;
1786 /* No queue ? Then there is nothing to do. */
1791 * We requeue request from the block device queue to the ccw
1792 * queue only in two states. In state DASD_STATE_READY the
1793 * partition detection is done and we need to requeue requests
1794 * for that. State DASD_STATE_ONLINE is normal block device
1797 if (basedev->state < DASD_STATE_READY) {
1798 while ((req = blk_fetch_request(block->request_queue)))
1799 __blk_end_request_all(req, -EIO);
1802 /* Now we try to fetch requests from the request queue */
1803 while (!blk_queue_plugged(queue) && (req = blk_peek_request(queue))) {
1804 if (basedev->features & DASD_FEATURE_READONLY &&
1805 rq_data_dir(req) == WRITE) {
1806 DBF_DEV_EVENT(DBF_ERR, basedev,
1807 "Rejecting write request %p",
1809 blk_start_request(req);
1810 __blk_end_request_all(req, -EIO);
1813 cqr = basedev->discipline->build_cp(basedev, block, req);
1815 if (PTR_ERR(cqr) == -EBUSY)
1816 break; /* normal end condition */
1817 if (PTR_ERR(cqr) == -ENOMEM)
1818 break; /* terminate request queue loop */
1819 if (PTR_ERR(cqr) == -EAGAIN) {
1821 * The current request cannot be build right
1822 * now, we have to try later. If this request
1823 * is the head-of-queue we stop the device
1826 if (!list_empty(&block->ccw_queue))
1829 get_ccwdev_lock(basedev->cdev), flags);
1830 dasd_device_set_stop_bits(basedev,
1831 DASD_STOPPED_PENDING);
1832 spin_unlock_irqrestore(
1833 get_ccwdev_lock(basedev->cdev), flags);
1834 dasd_block_set_timer(block, HZ/2);
1837 DBF_DEV_EVENT(DBF_ERR, basedev,
1838 "CCW creation failed (rc=%ld) "
1841 blk_start_request(req);
1842 __blk_end_request_all(req, -EIO);
1846 * Note: callback is set to dasd_return_cqr_cb in
1847 * __dasd_block_start_head to cover erp requests as well
1849 cqr->callback_data = (void *) req;
1850 cqr->status = DASD_CQR_FILLED;
1851 blk_start_request(req);
1852 list_add_tail(&cqr->blocklist, &block->ccw_queue);
1853 dasd_profile_start(block, cqr, req);
1857 static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
1859 struct request *req;
1863 req = (struct request *) cqr->callback_data;
1864 dasd_profile_end(cqr->block, cqr, req);
1865 status = cqr->block->base->discipline->free_cp(cqr, req);
1867 error = status ? status : -EIO;
1868 __blk_end_request_all(req, error);
1872 * Process ccw request queue.
1874 static void __dasd_process_block_ccw_queue(struct dasd_block *block,
1875 struct list_head *final_queue)
1877 struct list_head *l, *n;
1878 struct dasd_ccw_req *cqr;
1879 dasd_erp_fn_t erp_fn;
1880 unsigned long flags;
1881 struct dasd_device *base = block->base;
1884 /* Process request with final status. */
1885 list_for_each_safe(l, n, &block->ccw_queue) {
1886 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
1887 if (cqr->status != DASD_CQR_DONE &&
1888 cqr->status != DASD_CQR_FAILED &&
1889 cqr->status != DASD_CQR_NEED_ERP &&
1890 cqr->status != DASD_CQR_TERMINATED)
1893 if (cqr->status == DASD_CQR_TERMINATED) {
1894 base->discipline->handle_terminated_request(cqr);
1898 /* Process requests that may be recovered */
1899 if (cqr->status == DASD_CQR_NEED_ERP) {
1900 erp_fn = base->discipline->erp_action(cqr);
1905 /* log sense for fatal error */
1906 if (cqr->status == DASD_CQR_FAILED) {
1907 dasd_log_sense(cqr, &cqr->irb);
1910 /* First of all call extended error reporting. */
1911 if (dasd_eer_enabled(base) &&
1912 cqr->status == DASD_CQR_FAILED) {
1913 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
1915 /* restart request */
1916 cqr->status = DASD_CQR_FILLED;
1918 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
1919 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
1920 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
1925 /* Process finished ERP request. */
1927 __dasd_process_erp(base, cqr);
1931 /* Rechain finished requests to final queue */
1932 cqr->endclk = get_clock();
1933 list_move_tail(&cqr->blocklist, final_queue);
1937 static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
1939 dasd_schedule_block_bh(cqr->block);
1942 static void __dasd_block_start_head(struct dasd_block *block)
1944 struct dasd_ccw_req *cqr;
1946 if (list_empty(&block->ccw_queue))
1948 /* We allways begin with the first requests on the queue, as some
1949 * of previously started requests have to be enqueued on a
1950 * dasd_device again for error recovery.
1952 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
1953 if (cqr->status != DASD_CQR_FILLED)
1955 /* Non-temporary stop condition will trigger fail fast */
1956 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
1957 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
1958 (!dasd_eer_enabled(block->base))) {
1959 cqr->status = DASD_CQR_FAILED;
1960 dasd_schedule_block_bh(block);
1963 /* Don't try to start requests if device is stopped */
1964 if (block->base->stopped)
1967 /* just a fail safe check, should not happen */
1969 cqr->startdev = block->base;
1971 /* make sure that the requests we submit find their way back */
1972 cqr->callback = dasd_return_cqr_cb;
1974 dasd_add_request_tail(cqr);
1979 * Central dasd_block layer routine. Takes requests from the generic
1980 * block layer request queue, creates ccw requests, enqueues them on
1981 * a dasd_device and processes ccw requests that have been returned.
1983 static void dasd_block_tasklet(struct dasd_block *block)
1985 struct list_head final_queue;
1986 struct list_head *l, *n;
1987 struct dasd_ccw_req *cqr;
1989 atomic_set(&block->tasklet_scheduled, 0);
1990 INIT_LIST_HEAD(&final_queue);
1991 spin_lock(&block->queue_lock);
1992 /* Finish off requests on ccw queue */
1993 __dasd_process_block_ccw_queue(block, &final_queue);
1994 spin_unlock(&block->queue_lock);
1995 /* Now call the callback function of requests with final status */
1996 spin_lock_irq(&block->request_queue_lock);
1997 list_for_each_safe(l, n, &final_queue) {
1998 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
1999 list_del_init(&cqr->blocklist);
2000 __dasd_cleanup_cqr(cqr);
2002 spin_lock(&block->queue_lock);
2003 /* Get new request from the block device request queue */
2004 __dasd_process_request_queue(block);
2005 /* Now check if the head of the ccw queue needs to be started. */
2006 __dasd_block_start_head(block);
2007 spin_unlock(&block->queue_lock);
2008 spin_unlock_irq(&block->request_queue_lock);
2009 dasd_put_device(block->base);
2012 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2014 wake_up(&dasd_flush_wq);
2018 * Go through all request on the dasd_block request queue, cancel them
2019 * on the respective dasd_device, and return them to the generic
2022 static int dasd_flush_block_queue(struct dasd_block *block)
2024 struct dasd_ccw_req *cqr, *n;
2026 struct list_head flush_queue;
2028 INIT_LIST_HEAD(&flush_queue);
2029 spin_lock_bh(&block->queue_lock);
2032 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2033 /* if this request currently owned by a dasd_device cancel it */
2034 if (cqr->status >= DASD_CQR_QUEUED)
2035 rc = dasd_cancel_req(cqr);
2038 /* Rechain request (including erp chain) so it won't be
2039 * touched by the dasd_block_tasklet anymore.
2040 * Replace the callback so we notice when the request
2041 * is returned from the dasd_device layer.
2043 cqr->callback = _dasd_wake_block_flush_cb;
2044 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2045 list_move_tail(&cqr->blocklist, &flush_queue);
2047 /* moved more than one request - need to restart */
2050 spin_unlock_bh(&block->queue_lock);
2051 /* Now call the callback function of flushed requests */
2053 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
2054 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
2055 /* Process finished ERP request. */
2057 spin_lock_bh(&block->queue_lock);
2058 __dasd_process_erp(block->base, cqr);
2059 spin_unlock_bh(&block->queue_lock);
2060 /* restart list_for_xx loop since dasd_process_erp
2061 * might remove multiple elements */
2064 /* call the callback function */
2065 spin_lock_irq(&block->request_queue_lock);
2066 cqr->endclk = get_clock();
2067 list_del_init(&cqr->blocklist);
2068 __dasd_cleanup_cqr(cqr);
2069 spin_unlock_irq(&block->request_queue_lock);
2075 * Schedules a call to dasd_tasklet over the device tasklet.
2077 void dasd_schedule_block_bh(struct dasd_block *block)
2079 /* Protect against rescheduling. */
2080 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
2082 /* life cycle of block is bound to it's base device */
2083 dasd_get_device(block->base);
2084 tasklet_hi_schedule(&block->tasklet);
2089 * SECTION: external block device operations
2090 * (request queue handling, open, release, etc.)
2094 * Dasd request queue function. Called from ll_rw_blk.c
2096 static void do_dasd_request(struct request_queue *queue)
2098 struct dasd_block *block;
2100 block = queue->queuedata;
2101 spin_lock(&block->queue_lock);
2102 /* Get new request from the block device request queue */
2103 __dasd_process_request_queue(block);
2104 /* Now check if the head of the ccw queue needs to be started. */
2105 __dasd_block_start_head(block);
2106 spin_unlock(&block->queue_lock);
2110 * Allocate and initialize request queue and default I/O scheduler.
2112 static int dasd_alloc_queue(struct dasd_block *block)
2116 block->request_queue = blk_init_queue(do_dasd_request,
2117 &block->request_queue_lock);
2118 if (block->request_queue == NULL)
2121 block->request_queue->queuedata = block;
2123 elevator_exit(block->request_queue->elevator);
2124 block->request_queue->elevator = NULL;
2125 rc = elevator_init(block->request_queue, "deadline");
2127 blk_cleanup_queue(block->request_queue);
2134 * Allocate and initialize request queue.
2136 static void dasd_setup_queue(struct dasd_block *block)
2140 blk_queue_logical_block_size(block->request_queue, block->bp_block);
2141 max = block->base->discipline->max_blocks << block->s2b_shift;
2142 blk_queue_max_hw_sectors(block->request_queue, max);
2143 blk_queue_max_segments(block->request_queue, -1L);
2144 /* with page sized segments we can translate each segement into
2147 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
2148 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
2149 blk_queue_ordered(block->request_queue, QUEUE_ORDERED_DRAIN, NULL);
2153 * Deactivate and free request queue.
2155 static void dasd_free_queue(struct dasd_block *block)
2157 if (block->request_queue) {
2158 blk_cleanup_queue(block->request_queue);
2159 block->request_queue = NULL;
2164 * Flush request on the request queue.
2166 static void dasd_flush_request_queue(struct dasd_block *block)
2168 struct request *req;
2170 if (!block->request_queue)
2173 spin_lock_irq(&block->request_queue_lock);
2174 while ((req = blk_fetch_request(block->request_queue)))
2175 __blk_end_request_all(req, -EIO);
2176 spin_unlock_irq(&block->request_queue_lock);
2179 static int dasd_open(struct block_device *bdev, fmode_t mode)
2181 struct dasd_block *block = bdev->bd_disk->private_data;
2182 struct dasd_device *base;
2189 atomic_inc(&block->open_count);
2190 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
2195 if (!try_module_get(base->discipline->owner)) {
2200 if (dasd_probeonly) {
2201 dev_info(&base->cdev->dev,
2202 "Accessing the DASD failed because it is in "
2203 "probeonly mode\n");
2208 if (base->state <= DASD_STATE_BASIC) {
2209 DBF_DEV_EVENT(DBF_ERR, base, " %s",
2210 " Cannot open unrecognized device");
2218 module_put(base->discipline->owner);
2220 atomic_dec(&block->open_count);
2224 static int dasd_release(struct gendisk *disk, fmode_t mode)
2226 struct dasd_block *block = disk->private_data;
2228 atomic_dec(&block->open_count);
2229 module_put(block->base->discipline->owner);
2234 * Return disk geometry.
2236 static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
2238 struct dasd_block *block;
2239 struct dasd_device *base;
2241 block = bdev->bd_disk->private_data;
2246 if (!base->discipline ||
2247 !base->discipline->fill_geometry)
2250 base->discipline->fill_geometry(block, geo);
2251 geo->start = get_start_sect(bdev) >> block->s2b_shift;
2255 const struct block_device_operations
2256 dasd_device_operations = {
2257 .owner = THIS_MODULE,
2259 .release = dasd_release,
2260 .ioctl = dasd_ioctl,
2261 .compat_ioctl = dasd_ioctl,
2262 .getgeo = dasd_getgeo,
2265 /*******************************************************************************
2266 * end of block device operations
2272 #ifdef CONFIG_PROC_FS
2276 if (dasd_page_cache != NULL) {
2277 kmem_cache_destroy(dasd_page_cache);
2278 dasd_page_cache = NULL;
2280 dasd_gendisk_exit();
2282 if (dasd_debug_area != NULL) {
2283 debug_unregister(dasd_debug_area);
2284 dasd_debug_area = NULL;
2289 * SECTION: common functions for ccw_driver use
2292 static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
2294 struct ccw_device *cdev = data;
2297 ret = ccw_device_set_online(cdev);
2299 pr_warning("%s: Setting the DASD online failed with rc=%d\n",
2300 dev_name(&cdev->dev), ret);
2304 * Initial attempt at a probe function. this can be simplified once
2305 * the other detection code is gone.
2307 int dasd_generic_probe(struct ccw_device *cdev,
2308 struct dasd_discipline *discipline)
2312 ret = dasd_add_sysfs_files(cdev);
2314 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
2315 "dasd_generic_probe: could not add "
2319 cdev->handler = &dasd_int_handler;
2322 * Automatically online either all dasd devices (dasd_autodetect)
2323 * or all devices specified with dasd= parameters during
2326 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
2327 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
2328 async_schedule(dasd_generic_auto_online, cdev);
2333 * This will one day be called from a global not_oper handler.
2334 * It is also used by driver_unregister during module unload.
2336 void dasd_generic_remove(struct ccw_device *cdev)
2338 struct dasd_device *device;
2339 struct dasd_block *block;
2341 cdev->handler = NULL;
2343 dasd_remove_sysfs_files(cdev);
2344 device = dasd_device_from_cdev(cdev);
2347 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
2348 /* Already doing offline processing */
2349 dasd_put_device(device);
2353 * This device is removed unconditionally. Set offline
2354 * flag to prevent dasd_open from opening it while it is
2355 * no quite down yet.
2357 dasd_set_target_state(device, DASD_STATE_NEW);
2358 /* dasd_delete_device destroys the device reference. */
2359 block = device->block;
2360 device->block = NULL;
2361 dasd_delete_device(device);
2363 * life cycle of block is bound to device, so delete it after
2364 * device was safely removed
2367 dasd_free_block(block);
2371 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
2372 * the device is detected for the first time and is supposed to be used
2373 * or the user has started activation through sysfs.
2375 int dasd_generic_set_online(struct ccw_device *cdev,
2376 struct dasd_discipline *base_discipline)
2378 struct dasd_discipline *discipline;
2379 struct dasd_device *device;
2382 /* first online clears initial online feature flag */
2383 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
2384 device = dasd_create_device(cdev);
2386 return PTR_ERR(device);
2388 discipline = base_discipline;
2389 if (device->features & DASD_FEATURE_USEDIAG) {
2390 if (!dasd_diag_discipline_pointer) {
2391 pr_warning("%s Setting the DASD online failed because "
2392 "of missing DIAG discipline\n",
2393 dev_name(&cdev->dev));
2394 dasd_delete_device(device);
2397 discipline = dasd_diag_discipline_pointer;
2399 if (!try_module_get(base_discipline->owner)) {
2400 dasd_delete_device(device);
2403 if (!try_module_get(discipline->owner)) {
2404 module_put(base_discipline->owner);
2405 dasd_delete_device(device);
2408 device->base_discipline = base_discipline;
2409 device->discipline = discipline;
2411 /* check_device will allocate block device if necessary */
2412 rc = discipline->check_device(device);
2414 pr_warning("%s Setting the DASD online with discipline %s "
2415 "failed with rc=%i\n",
2416 dev_name(&cdev->dev), discipline->name, rc);
2417 module_put(discipline->owner);
2418 module_put(base_discipline->owner);
2419 dasd_delete_device(device);
2423 dasd_set_target_state(device, DASD_STATE_ONLINE);
2424 if (device->state <= DASD_STATE_KNOWN) {
2425 pr_warning("%s Setting the DASD online failed because of a "
2426 "missing discipline\n", dev_name(&cdev->dev));
2428 dasd_set_target_state(device, DASD_STATE_NEW);
2430 dasd_free_block(device->block);
2431 dasd_delete_device(device);
2433 pr_debug("dasd_generic device %s found\n",
2434 dev_name(&cdev->dev));
2436 wait_event(dasd_init_waitq, _wait_for_device(device));
2438 dasd_put_device(device);
2442 int dasd_generic_set_offline(struct ccw_device *cdev)
2444 struct dasd_device *device;
2445 struct dasd_block *block;
2446 int max_count, open_count;
2448 device = dasd_device_from_cdev(cdev);
2450 return PTR_ERR(device);
2451 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
2452 /* Already doing offline processing */
2453 dasd_put_device(device);
2457 * We must make sure that this device is currently not in use.
2458 * The open_count is increased for every opener, that includes
2459 * the blkdev_get in dasd_scan_partitions. We are only interested
2460 * in the other openers.
2462 if (device->block) {
2463 max_count = device->block->bdev ? 0 : -1;
2464 open_count = atomic_read(&device->block->open_count);
2465 if (open_count > max_count) {
2467 pr_warning("%s: The DASD cannot be set offline "
2468 "with open count %i\n",
2469 dev_name(&cdev->dev), open_count);
2471 pr_warning("%s: The DASD cannot be set offline "
2472 "while it is in use\n",
2473 dev_name(&cdev->dev));
2474 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
2475 dasd_put_device(device);
2479 dasd_set_target_state(device, DASD_STATE_NEW);
2480 /* dasd_delete_device destroys the device reference. */
2481 block = device->block;
2482 device->block = NULL;
2483 dasd_delete_device(device);
2485 * life cycle of block is bound to device, so delete it after
2486 * device was safely removed
2489 dasd_free_block(block);
2493 int dasd_generic_notify(struct ccw_device *cdev, int event)
2495 struct dasd_device *device;
2496 struct dasd_ccw_req *cqr;
2499 device = dasd_device_from_cdev_locked(cdev);
2507 /* First of all call extended error reporting. */
2508 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
2510 if (device->state < DASD_STATE_BASIC)
2512 /* Device is active. We want to keep it. */
2513 list_for_each_entry(cqr, &device->ccw_queue, devlist)
2514 if (cqr->status == DASD_CQR_IN_IO) {
2515 cqr->status = DASD_CQR_QUEUED;
2518 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
2519 dasd_device_clear_timer(device);
2520 dasd_schedule_device_bh(device);
2524 /* FIXME: add a sanity check. */
2525 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
2526 if (device->stopped & DASD_UNRESUMED_PM) {
2527 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
2528 dasd_restore_device(device);
2532 dasd_schedule_device_bh(device);
2534 dasd_schedule_block_bh(device->block);
2538 dasd_put_device(device);
2542 int dasd_generic_pm_freeze(struct ccw_device *cdev)
2544 struct dasd_ccw_req *cqr, *n;
2546 struct list_head freeze_queue;
2547 struct dasd_device *device = dasd_device_from_cdev(cdev);
2550 return PTR_ERR(device);
2551 /* disallow new I/O */
2552 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
2553 /* clear active requests */
2554 INIT_LIST_HEAD(&freeze_queue);
2555 spin_lock_irq(get_ccwdev_lock(cdev));
2557 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
2558 /* Check status and move request to flush_queue */
2559 if (cqr->status == DASD_CQR_IN_IO) {
2560 rc = device->discipline->term_IO(cqr);
2562 /* unable to terminate requeust */
2563 dev_err(&device->cdev->dev,
2564 "Unable to terminate request %p "
2565 "on suspend\n", cqr);
2566 spin_unlock_irq(get_ccwdev_lock(cdev));
2567 dasd_put_device(device);
2571 list_move_tail(&cqr->devlist, &freeze_queue);
2574 spin_unlock_irq(get_ccwdev_lock(cdev));
2576 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
2577 wait_event(dasd_flush_wq,
2578 (cqr->status != DASD_CQR_CLEAR_PENDING));
2579 if (cqr->status == DASD_CQR_CLEARED)
2580 cqr->status = DASD_CQR_QUEUED;
2582 /* move freeze_queue to start of the ccw_queue */
2583 spin_lock_irq(get_ccwdev_lock(cdev));
2584 list_splice_tail(&freeze_queue, &device->ccw_queue);
2585 spin_unlock_irq(get_ccwdev_lock(cdev));
2587 if (device->discipline->freeze)
2588 rc = device->discipline->freeze(device);
2590 dasd_put_device(device);
2593 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
2595 int dasd_generic_restore_device(struct ccw_device *cdev)
2597 struct dasd_device *device = dasd_device_from_cdev(cdev);
2601 return PTR_ERR(device);
2603 /* allow new IO again */
2604 dasd_device_remove_stop_bits(device,
2605 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
2607 dasd_schedule_device_bh(device);
2610 * call discipline restore function
2611 * if device is stopped do nothing e.g. for disconnected devices
2613 if (device->discipline->restore && !(device->stopped))
2614 rc = device->discipline->restore(device);
2615 if (rc || device->stopped)
2617 * if the resume failed for the DASD we put it in
2618 * an UNRESUMED stop state
2620 device->stopped |= DASD_UNRESUMED_PM;
2623 dasd_schedule_block_bh(device->block);
2625 dasd_put_device(device);
2628 EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
2630 static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
2632 int rdc_buffer_size,
2635 struct dasd_ccw_req *cqr;
2637 unsigned long *idaw;
2639 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
2642 /* internal error 13 - Allocating the RDC request failed*/
2643 dev_err(&device->cdev->dev,
2644 "An error occurred in the DASD device driver, "
2645 "reason=%s\n", "13");
2650 ccw->cmd_code = CCW_CMD_RDC;
2651 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
2652 idaw = (unsigned long *) (cqr->data);
2653 ccw->cda = (__u32)(addr_t) idaw;
2654 ccw->flags = CCW_FLAG_IDA;
2655 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
2657 ccw->cda = (__u32)(addr_t) rdc_buffer;
2661 ccw->count = rdc_buffer_size;
2662 cqr->startdev = device;
2663 cqr->memdev = device;
2664 cqr->expires = 10*HZ;
2666 cqr->buildclk = get_clock();
2667 cqr->status = DASD_CQR_FILLED;
2672 int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
2673 void *rdc_buffer, int rdc_buffer_size)
2676 struct dasd_ccw_req *cqr;
2678 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
2681 return PTR_ERR(cqr);
2683 ret = dasd_sleep_on(cqr);
2684 dasd_sfree_request(cqr, cqr->memdev);
2687 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
2690 * In command mode and transport mode we need to look for sense
2691 * data in different places. The sense data itself is allways
2692 * an array of 32 bytes, so we can unify the sense data access
2695 char *dasd_get_sense(struct irb *irb)
2697 struct tsb *tsb = NULL;
2700 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
2701 if (irb->scsw.tm.tcw)
2702 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
2704 if (tsb && tsb->length == 64 && tsb->flags)
2705 switch (tsb->flags & 0x07) {
2706 case 1: /* tsa_iostat */
2707 sense = tsb->tsa.iostat.sense;
2709 case 2: /* tsa_ddpc */
2710 sense = tsb->tsa.ddpc.sense;
2713 /* currently we don't use interrogate data */
2716 } else if (irb->esw.esw0.erw.cons) {
2721 EXPORT_SYMBOL_GPL(dasd_get_sense);
2723 static int __init dasd_init(void)
2727 init_waitqueue_head(&dasd_init_waitq);
2728 init_waitqueue_head(&dasd_flush_wq);
2729 init_waitqueue_head(&generic_waitq);
2731 /* register 'common' DASD debug area, used for all DBF_XXX calls */
2732 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
2733 if (dasd_debug_area == NULL) {
2737 debug_register_view(dasd_debug_area, &debug_sprintf_view);
2738 debug_set_level(dasd_debug_area, DBF_WARNING);
2740 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
2742 dasd_diag_discipline_pointer = NULL;
2744 rc = dasd_devmap_init();
2747 rc = dasd_gendisk_init();
2753 rc = dasd_eer_init();
2756 #ifdef CONFIG_PROC_FS
2757 rc = dasd_proc_init();
2764 pr_info("The DASD device driver could not be initialized\n");
2769 module_init(dasd_init);
2770 module_exit(dasd_exit);
2772 EXPORT_SYMBOL(dasd_debug_area);
2773 EXPORT_SYMBOL(dasd_diag_discipline_pointer);
2775 EXPORT_SYMBOL(dasd_add_request_head);
2776 EXPORT_SYMBOL(dasd_add_request_tail);
2777 EXPORT_SYMBOL(dasd_cancel_req);
2778 EXPORT_SYMBOL(dasd_device_clear_timer);
2779 EXPORT_SYMBOL(dasd_block_clear_timer);
2780 EXPORT_SYMBOL(dasd_enable_device);
2781 EXPORT_SYMBOL(dasd_int_handler);
2782 EXPORT_SYMBOL(dasd_kfree_request);
2783 EXPORT_SYMBOL(dasd_kick_device);
2784 EXPORT_SYMBOL(dasd_kmalloc_request);
2785 EXPORT_SYMBOL(dasd_schedule_device_bh);
2786 EXPORT_SYMBOL(dasd_schedule_block_bh);
2787 EXPORT_SYMBOL(dasd_set_target_state);
2788 EXPORT_SYMBOL(dasd_device_set_timer);
2789 EXPORT_SYMBOL(dasd_block_set_timer);
2790 EXPORT_SYMBOL(dasd_sfree_request);
2791 EXPORT_SYMBOL(dasd_sleep_on);
2792 EXPORT_SYMBOL(dasd_sleep_on_immediatly);
2793 EXPORT_SYMBOL(dasd_sleep_on_interruptible);
2794 EXPORT_SYMBOL(dasd_smalloc_request);
2795 EXPORT_SYMBOL(dasd_start_IO);
2796 EXPORT_SYMBOL(dasd_term_IO);
2798 EXPORT_SYMBOL_GPL(dasd_generic_probe);
2799 EXPORT_SYMBOL_GPL(dasd_generic_remove);
2800 EXPORT_SYMBOL_GPL(dasd_generic_notify);
2801 EXPORT_SYMBOL_GPL(dasd_generic_set_online);
2802 EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
2803 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
2804 EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
2805 EXPORT_SYMBOL_GPL(dasd_alloc_block);
2806 EXPORT_SYMBOL_GPL(dasd_free_block);