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 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
13 #include <linux/config.h>
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>
22 #include <asm/ccwdev.h>
23 #include <asm/ebcdic.h>
24 #include <asm/idals.h>
25 #include <asm/todclk.h>
28 #define PRINTK_HEADER "dasd:"
32 * SECTION: Constant definitions to be used within this file
34 #define DASD_CHANQ_MAX_SIZE 4
37 * SECTION: exported variables of dasd.c
39 debug_info_t *dasd_debug_area;
40 struct dasd_discipline *dasd_diag_discipline_pointer;
42 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
43 MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
44 " Copyright 2000 IBM Corporation");
45 MODULE_SUPPORTED_DEVICE("dasd");
46 MODULE_PARM(dasd, "1-" __MODULE_STRING(256) "s");
47 MODULE_LICENSE("GPL");
50 * SECTION: prototypes for static functions of dasd.c
52 static int dasd_alloc_queue(struct dasd_device * device);
53 static void dasd_setup_queue(struct dasd_device * device);
54 static void dasd_free_queue(struct dasd_device * device);
55 static void dasd_flush_request_queue(struct dasd_device *);
56 static void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
57 static void dasd_flush_ccw_queue(struct dasd_device *, int);
58 static void dasd_tasklet(struct dasd_device *);
59 static void do_kick_device(void *data);
62 * SECTION: Operations on the device structure.
64 static wait_queue_head_t dasd_init_waitq;
67 * Allocate memory for a new device structure.
70 dasd_alloc_device(void)
72 struct dasd_device *device;
74 device = kmalloc(sizeof (struct dasd_device), GFP_ATOMIC);
76 return ERR_PTR(-ENOMEM);
77 memset(device, 0, sizeof (struct dasd_device));
78 /* open_count = 0 means device online but not in use */
79 atomic_set(&device->open_count, -1);
81 /* Get two pages for normal block device operations. */
82 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
83 if (device->ccw_mem == NULL) {
85 return ERR_PTR(-ENOMEM);
87 /* Get one page for error recovery. */
88 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
89 if (device->erp_mem == NULL) {
90 free_pages((unsigned long) device->ccw_mem, 1);
92 return ERR_PTR(-ENOMEM);
95 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
96 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
97 spin_lock_init(&device->mem_lock);
98 spin_lock_init(&device->request_queue_lock);
99 atomic_set (&device->tasklet_scheduled, 0);
100 tasklet_init(&device->tasklet,
101 (void (*)(unsigned long)) dasd_tasklet,
102 (unsigned long) device);
103 INIT_LIST_HEAD(&device->ccw_queue);
104 init_timer(&device->timer);
105 INIT_WORK(&device->kick_work, do_kick_device, device);
106 device->state = DASD_STATE_NEW;
107 device->target = DASD_STATE_NEW;
113 * Free memory of a device structure.
116 dasd_free_device(struct dasd_device *device)
118 kfree(device->private);
119 free_page((unsigned long) device->erp_mem);
120 free_pages((unsigned long) device->ccw_mem, 1);
125 * Make a new device known to the system.
128 dasd_state_new_to_known(struct dasd_device *device)
133 * As long as the device is not in state DASD_STATE_NEW we want to
134 * keep the reference count > 0.
136 dasd_get_device(device);
138 rc = dasd_alloc_queue(device);
140 dasd_put_device(device);
144 device->state = DASD_STATE_KNOWN;
149 * Let the system forget about a device.
152 dasd_state_known_to_new(struct dasd_device * device)
154 /* Forget the discipline information. */
155 device->discipline = NULL;
156 device->state = DASD_STATE_NEW;
158 dasd_free_queue(device);
160 /* Give up reference we took in dasd_state_new_to_known. */
161 dasd_put_device(device);
165 * Request the irq line for the device.
168 dasd_state_known_to_basic(struct dasd_device * device)
172 /* Allocate and register gendisk structure. */
173 rc = dasd_gendisk_alloc(device);
177 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
178 device->debug_area = debug_register(device->cdev->dev.bus_id, 1, 2,
180 debug_register_view(device->debug_area, &debug_sprintf_view);
181 debug_set_level(device->debug_area, DBF_EMERG);
182 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
184 device->state = DASD_STATE_BASIC;
189 * Release the irq line for the device. Terminate any running i/o.
192 dasd_state_basic_to_known(struct dasd_device * device)
194 dasd_gendisk_free(device);
195 dasd_flush_ccw_queue(device, 1);
196 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
197 if (device->debug_area != NULL) {
198 debug_unregister(device->debug_area);
199 device->debug_area = NULL;
201 device->state = DASD_STATE_KNOWN;
205 * Do the initial analysis. The do_analysis function may return
206 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
207 * until the discipline decides to continue the startup sequence
208 * by calling the function dasd_change_state. The eckd disciplines
209 * uses this to start a ccw that detects the format. The completion
210 * interrupt for this detection ccw uses the kernel event daemon to
211 * trigger the call to dasd_change_state. All this is done in the
212 * discipline code, see dasd_eckd.c.
213 * After the analysis ccw is done (do_analysis returned 0 or error)
214 * the block device is setup. Either a fake disk is added to allow
215 * formatting or a proper device request queue is created.
218 dasd_state_basic_to_ready(struct dasd_device * device)
223 if (device->discipline->do_analysis != NULL)
224 rc = device->discipline->do_analysis(device);
227 dasd_setup_queue(device);
228 device->state = DASD_STATE_READY;
229 if (dasd_scan_partitions(device) != 0)
230 device->state = DASD_STATE_BASIC;
235 * Remove device from block device layer. Destroy dirty buffers.
236 * Forget format information. Check if the target level is basic
237 * and if it is create fake disk for formatting.
240 dasd_state_ready_to_basic(struct dasd_device * device)
242 dasd_flush_ccw_queue(device, 0);
243 dasd_destroy_partitions(device);
244 dasd_flush_request_queue(device);
246 device->bp_block = 0;
247 device->s2b_shift = 0;
248 device->state = DASD_STATE_BASIC;
252 * Make the device online and schedule the bottom half to start
253 * the requeueing of requests from the linux request queue to the
257 dasd_state_ready_to_online(struct dasd_device * device)
259 device->state = DASD_STATE_ONLINE;
260 dasd_schedule_bh(device);
265 * Stop the requeueing of requests again.
268 dasd_state_online_to_ready(struct dasd_device * device)
270 device->state = DASD_STATE_READY;
274 * Device startup state changes.
277 dasd_increase_state(struct dasd_device *device)
282 if (device->state == DASD_STATE_NEW &&
283 device->target >= DASD_STATE_KNOWN)
284 rc = dasd_state_new_to_known(device);
287 device->state == DASD_STATE_KNOWN &&
288 device->target >= DASD_STATE_BASIC)
289 rc = dasd_state_known_to_basic(device);
292 device->state == DASD_STATE_BASIC &&
293 device->target >= DASD_STATE_READY)
294 rc = dasd_state_basic_to_ready(device);
297 device->state == DASD_STATE_READY &&
298 device->target >= DASD_STATE_ONLINE)
299 rc = dasd_state_ready_to_online(device);
305 * Device shutdown state changes.
308 dasd_decrease_state(struct dasd_device *device)
310 if (device->state == DASD_STATE_ONLINE &&
311 device->target <= DASD_STATE_READY)
312 dasd_state_online_to_ready(device);
314 if (device->state == DASD_STATE_READY &&
315 device->target <= DASD_STATE_BASIC)
316 dasd_state_ready_to_basic(device);
318 if (device->state == DASD_STATE_BASIC &&
319 device->target <= DASD_STATE_KNOWN)
320 dasd_state_basic_to_known(device);
322 if (device->state == DASD_STATE_KNOWN &&
323 device->target <= DASD_STATE_NEW)
324 dasd_state_known_to_new(device);
330 * This is the main startup/shutdown routine.
333 dasd_change_state(struct dasd_device *device)
337 if (device->state == device->target)
338 /* Already where we want to go today... */
340 if (device->state < device->target)
341 rc = dasd_increase_state(device);
343 rc = dasd_decrease_state(device);
344 if (rc && rc != -EAGAIN)
345 device->target = device->state;
347 if (device->state == device->target)
348 wake_up(&dasd_init_waitq);
352 * Kick starter for devices that did not complete the startup/shutdown
353 * procedure or were sleeping because of a pending state.
354 * dasd_kick_device will schedule a call do do_kick_device to the kernel
358 do_kick_device(void *data)
360 struct dasd_device *device;
362 device = (struct dasd_device *) data;
363 dasd_change_state(device);
364 dasd_schedule_bh(device);
365 dasd_put_device(device);
369 dasd_kick_device(struct dasd_device *device)
371 dasd_get_device(device);
372 /* queue call to dasd_kick_device to the kernel event daemon. */
373 schedule_work(&device->kick_work);
377 * Set the target state for a device and starts the state change.
380 dasd_set_target_state(struct dasd_device *device, int target)
382 /* If we are in probeonly mode stop at DASD_STATE_READY. */
383 if (dasd_probeonly && target > DASD_STATE_READY)
384 target = DASD_STATE_READY;
385 if (device->target != target) {
386 if (device->state == target)
387 wake_up(&dasd_init_waitq);
388 device->target = target;
390 if (device->state != device->target)
391 dasd_change_state(device);
395 * Enable devices with device numbers in [from..to].
398 _wait_for_device(struct dasd_device *device)
400 return (device->state == device->target);
404 dasd_enable_device(struct dasd_device *device)
406 dasd_set_target_state(device, DASD_STATE_ONLINE);
407 if (device->state <= DASD_STATE_KNOWN)
408 /* No discipline for device found. */
409 dasd_set_target_state(device, DASD_STATE_NEW);
410 /* Now wait for the devices to come up. */
411 wait_event(dasd_init_waitq, _wait_for_device(device));
415 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
417 #ifdef CONFIG_DASD_PROFILE
419 struct dasd_profile_info_t dasd_global_profile;
420 unsigned int dasd_profile_level = DASD_PROFILE_OFF;
423 * Increments counter in global and local profiling structures.
425 #define dasd_profile_counter(value, counter, device) \
428 for (index = 0; index < 31 && value >> (2+index); index++); \
429 dasd_global_profile.counter[index]++; \
430 device->profile.counter[index]++; \
434 * Add profiling information for cqr before execution.
437 dasd_profile_start(struct dasd_device *device, struct dasd_ccw_req * cqr,
441 unsigned int counter;
443 if (dasd_profile_level != DASD_PROFILE_ON)
446 /* count the length of the chanq for statistics */
448 list_for_each(l, &device->ccw_queue)
451 dasd_global_profile.dasd_io_nr_req[counter]++;
452 device->profile.dasd_io_nr_req[counter]++;
456 * Add profiling information for cqr after execution.
459 dasd_profile_end(struct dasd_device *device, struct dasd_ccw_req * cqr,
462 long strtime, irqtime, endtime, tottime; /* in microseconds */
463 long tottimeps, sectors;
465 if (dasd_profile_level != DASD_PROFILE_ON)
468 sectors = req->nr_sectors;
469 if (!cqr->buildclk || !cqr->startclk ||
470 !cqr->stopclk || !cqr->endclk ||
474 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
475 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
476 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
477 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
478 tottimeps = tottime / sectors;
480 if (!dasd_global_profile.dasd_io_reqs)
481 memset(&dasd_global_profile, 0,
482 sizeof (struct dasd_profile_info_t));
483 dasd_global_profile.dasd_io_reqs++;
484 dasd_global_profile.dasd_io_sects += sectors;
486 if (!device->profile.dasd_io_reqs)
487 memset(&device->profile, 0,
488 sizeof (struct dasd_profile_info_t));
489 device->profile.dasd_io_reqs++;
490 device->profile.dasd_io_sects += sectors;
492 dasd_profile_counter(sectors, dasd_io_secs, device);
493 dasd_profile_counter(tottime, dasd_io_times, device);
494 dasd_profile_counter(tottimeps, dasd_io_timps, device);
495 dasd_profile_counter(strtime, dasd_io_time1, device);
496 dasd_profile_counter(irqtime, dasd_io_time2, device);
497 dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, device);
498 dasd_profile_counter(endtime, dasd_io_time3, device);
501 #define dasd_profile_start(device, cqr, req) do {} while (0)
502 #define dasd_profile_end(device, cqr, req) do {} while (0)
503 #endif /* CONFIG_DASD_PROFILE */
506 * Allocate memory for a channel program with 'cplength' channel
507 * command words and 'datasize' additional space. There are two
508 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
509 * memory and 2) dasd_smalloc_request uses the static ccw memory
510 * that gets allocated for each device.
512 struct dasd_ccw_req *
513 dasd_kmalloc_request(char *magic, int cplength, int datasize,
514 struct dasd_device * device)
516 struct dasd_ccw_req *cqr;
519 if ( magic == NULL || datasize > PAGE_SIZE ||
520 (cplength*sizeof(struct ccw1)) > PAGE_SIZE)
523 cqr = kmalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
525 return ERR_PTR(-ENOMEM);
526 memset(cqr, 0, sizeof(struct dasd_ccw_req));
529 cqr->cpaddr = kmalloc(cplength*sizeof(struct ccw1),
530 GFP_ATOMIC | GFP_DMA);
531 if (cqr->cpaddr == NULL) {
533 return ERR_PTR(-ENOMEM);
535 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
539 cqr->data = kmalloc(datasize, GFP_ATOMIC | GFP_DMA);
540 if (cqr->data == NULL) {
543 return ERR_PTR(-ENOMEM);
545 memset(cqr->data, 0, datasize);
547 strncpy((char *) &cqr->magic, magic, 4);
548 ASCEBC((char *) &cqr->magic, 4);
549 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
550 dasd_get_device(device);
554 struct dasd_ccw_req *
555 dasd_smalloc_request(char *magic, int cplength, int datasize,
556 struct dasd_device * device)
559 struct dasd_ccw_req *cqr;
564 if ( magic == NULL || datasize > PAGE_SIZE ||
565 (cplength*sizeof(struct ccw1)) > PAGE_SIZE)
568 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
570 size += cplength * sizeof(struct ccw1);
573 spin_lock_irqsave(&device->mem_lock, flags);
574 cqr = (struct dasd_ccw_req *)
575 dasd_alloc_chunk(&device->ccw_chunks, size);
576 spin_unlock_irqrestore(&device->mem_lock, flags);
578 return ERR_PTR(-ENOMEM);
579 memset(cqr, 0, sizeof(struct dasd_ccw_req));
580 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
583 cqr->cpaddr = (struct ccw1 *) data;
584 data += cplength*sizeof(struct ccw1);
585 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
590 memset(cqr->data, 0, datasize);
592 strncpy((char *) &cqr->magic, magic, 4);
593 ASCEBC((char *) &cqr->magic, 4);
594 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
595 dasd_get_device(device);
600 * Free memory of a channel program. This function needs to free all the
601 * idal lists that might have been created by dasd_set_cda and the
602 * struct dasd_ccw_req itself.
605 dasd_kfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device)
607 #ifdef CONFIG_ARCH_S390X
610 /* Clear any idals used for the request. */
613 clear_normalized_cda(ccw);
614 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
619 dasd_put_device(device);
623 dasd_sfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device)
627 spin_lock_irqsave(&device->mem_lock, flags);
628 dasd_free_chunk(&device->ccw_chunks, cqr);
629 spin_unlock_irqrestore(&device->mem_lock, flags);
630 dasd_put_device(device);
634 * Check discipline magic in cqr.
637 dasd_check_cqr(struct dasd_ccw_req *cqr)
639 struct dasd_device *device;
643 device = cqr->device;
644 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
645 DEV_MESSAGE(KERN_WARNING, device,
646 " dasd_ccw_req 0x%08x magic doesn't match"
647 " discipline 0x%08x",
649 *(unsigned int *) device->discipline->name);
656 * Terminate the current i/o and set the request to clear_pending.
657 * Timer keeps device runnig.
658 * ccw_device_clear can fail if the i/o subsystem
662 dasd_term_IO(struct dasd_ccw_req * cqr)
664 struct dasd_device *device;
668 rc = dasd_check_cqr(cqr);
672 device = (struct dasd_device *) cqr->device;
673 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
674 rc = ccw_device_clear(device->cdev, (long) cqr);
676 case 0: /* termination successful */
677 if (cqr->retries > 0) {
679 cqr->status = DASD_CQR_CLEAR;
681 cqr->status = DASD_CQR_FAILED;
682 cqr->stopclk = get_clock();
683 DBF_DEV_EVENT(DBF_DEBUG, device,
684 "terminate cqr %p successful",
688 DBF_DEV_EVENT(DBF_ERR, device, "%s",
689 "device gone, retry");
692 DBF_DEV_EVENT(DBF_ERR, device, "%s",
697 DBF_DEV_EVENT(DBF_ERR, device, "%s",
698 "device busy, retry later");
701 DEV_MESSAGE(KERN_ERR, device,
702 "line %d unknown RC=%d, please "
703 "report to linux390@de.ibm.com",
710 dasd_schedule_bh(device);
715 * Start the i/o. This start_IO can fail if the channel is really busy.
716 * In that case set up a timer to start the request later.
719 dasd_start_IO(struct dasd_ccw_req * cqr)
721 struct dasd_device *device;
725 rc = dasd_check_cqr(cqr);
728 device = (struct dasd_device *) cqr->device;
729 if (cqr->retries < 0) {
730 DEV_MESSAGE(KERN_DEBUG, device,
731 "start_IO: request %p (%02x/%i) - no retry left.",
732 cqr, cqr->status, cqr->retries);
733 cqr->status = DASD_CQR_FAILED;
736 cqr->startclk = get_clock();
737 cqr->starttime = jiffies;
739 rc = ccw_device_start(device->cdev, cqr->cpaddr, (long) cqr,
743 cqr->status = DASD_CQR_IN_IO;
744 DBF_DEV_EVENT(DBF_DEBUG, device,
745 "start_IO: request %p started successful",
749 DBF_DEV_EVENT(DBF_ERR, device, "%s",
750 "start_IO: device busy, retry later");
753 DBF_DEV_EVENT(DBF_ERR, device, "%s",
754 "start_IO: request timeout, retry later");
757 /* -EACCES indicates that the request used only a
758 * subset of the available pathes and all these
760 * Do a retry with all available pathes.
762 cqr->lpm = LPM_ANYPATH;
763 DBF_DEV_EVENT(DBF_ERR, device, "%s",
764 "start_IO: selected pathes gone,"
765 " retry on all pathes");
769 DBF_DEV_EVENT(DBF_ERR, device, "%s",
770 "start_IO: device gone, retry");
773 DEV_MESSAGE(KERN_ERR, device,
774 "line %d unknown RC=%d, please report"
775 " to linux390@de.ibm.com", __LINE__, rc);
783 * Timeout function for dasd devices. This is used for different purposes
784 * 1) missing interrupt handler for normal operation
785 * 2) delayed start of request where start_IO failed with -EBUSY
786 * 3) timeout for missing state change interrupts
787 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
788 * DASD_CQR_QUEUED for 2) and 3).
791 dasd_timeout_device(unsigned long ptr)
794 struct dasd_device *device;
796 device = (struct dasd_device *) ptr;
797 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
798 /* re-activate request queue */
799 device->stopped &= ~DASD_STOPPED_PENDING;
800 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
801 dasd_schedule_bh(device);
805 * Setup timeout for a device in jiffies.
808 dasd_set_timer(struct dasd_device *device, int expires)
811 if (timer_pending(&device->timer))
812 del_timer(&device->timer);
815 if (timer_pending(&device->timer)) {
816 if (mod_timer(&device->timer, jiffies + expires))
819 device->timer.function = dasd_timeout_device;
820 device->timer.data = (unsigned long) device;
821 device->timer.expires = jiffies + expires;
822 add_timer(&device->timer);
826 * Clear timeout for a device.
829 dasd_clear_timer(struct dasd_device *device)
831 if (timer_pending(&device->timer))
832 del_timer(&device->timer);
836 dasd_handle_killed_request(struct ccw_device *cdev, unsigned long intparm)
838 struct dasd_ccw_req *cqr;
839 struct dasd_device *device;
841 cqr = (struct dasd_ccw_req *) intparm;
842 if (cqr->status != DASD_CQR_IN_IO) {
844 "invalid status in handle_killed_request: "
845 "bus_id %s, status %02x",
846 cdev->dev.bus_id, cqr->status);
850 device = (struct dasd_device *) cqr->device;
851 if (device == NULL ||
852 device != dasd_device_from_cdev(cdev) ||
853 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
854 MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s",
859 /* Schedule request to be retried. */
860 cqr->status = DASD_CQR_QUEUED;
862 dasd_clear_timer(device);
863 dasd_schedule_bh(device);
864 dasd_put_device(device);
868 dasd_handle_state_change_pending(struct dasd_device *device)
870 struct dasd_ccw_req *cqr;
871 struct list_head *l, *n;
873 device->stopped &= ~DASD_STOPPED_PENDING;
875 /* restart all 'running' IO on queue */
876 list_for_each_safe(l, n, &device->ccw_queue) {
877 cqr = list_entry(l, struct dasd_ccw_req, list);
878 if (cqr->status == DASD_CQR_IN_IO) {
879 cqr->status = DASD_CQR_QUEUED;
882 dasd_clear_timer(device);
883 dasd_schedule_bh(device);
887 * Interrupt handler for "normal" ssch-io based dasd devices.
890 dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
893 struct dasd_ccw_req *cqr, *next;
894 struct dasd_device *device;
895 unsigned long long now;
901 switch (PTR_ERR(irb)) {
903 dasd_handle_killed_request(cdev, intparm);
906 printk(KERN_WARNING"%s(%s): request timed out\n",
907 __FUNCTION__, cdev->dev.bus_id);
908 //FIXME - dasd uses own timeout interface...
911 printk(KERN_WARNING"%s(%s): unknown error %ld\n",
912 __FUNCTION__, cdev->dev.bus_id, PTR_ERR(irb));
919 DBF_EVENT(DBF_ERR, "Interrupt: bus_id %s CS/DS %04x ip %08x",
920 cdev->dev.bus_id, ((irb->scsw.cstat<<8)|irb->scsw.dstat),
921 (unsigned int) intparm);
923 /* first of all check for state change pending interrupt */
924 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
925 if ((irb->scsw.dstat & mask) == mask) {
926 device = dasd_device_from_cdev(cdev);
927 if (!IS_ERR(device)) {
928 dasd_handle_state_change_pending(device);
929 dasd_put_device(device);
934 cqr = (struct dasd_ccw_req *) intparm;
936 /* check for unsolicited interrupts */
939 "unsolicited interrupt received: bus_id %s",
944 device = (struct dasd_device *) cqr->device;
945 if (device == NULL ||
946 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
947 MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s",
952 /* Check for clear pending */
953 if (cqr->status == DASD_CQR_CLEAR &&
954 irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) {
955 cqr->status = DASD_CQR_QUEUED;
956 dasd_clear_timer(device);
957 dasd_schedule_bh(device);
961 /* check status - the request might have been killed by dyn detach */
962 if (cqr->status != DASD_CQR_IN_IO) {
964 "invalid status: bus_id %s, status %02x",
965 cdev->dev.bus_id, cqr->status);
968 DBF_DEV_EVENT(DBF_DEBUG, device, "Int: CS/DS 0x%04x for cqr %p",
969 ((irb->scsw.cstat << 8) | irb->scsw.dstat), cqr);
971 /* Find out the appropriate era_action. */
972 if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC)
973 era = dasd_era_fatal;
974 else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
975 irb->scsw.cstat == 0 &&
976 !irb->esw.esw0.erw.cons)
978 else if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags))
979 era = dasd_era_fatal; /* don't recover this request */
980 else if (irb->esw.esw0.erw.cons)
981 era = device->discipline->examine_error(cqr, irb);
983 era = dasd_era_recover;
985 DBF_DEV_EVENT(DBF_DEBUG, device, "era_code %d", era);
987 if (era == dasd_era_none) {
988 cqr->status = DASD_CQR_DONE;
990 /* Start first request on queue if possible -> fast_io. */
991 if (cqr->list.next != &device->ccw_queue) {
992 next = list_entry(cqr->list.next,
993 struct dasd_ccw_req, list);
994 if ((next->status == DASD_CQR_QUEUED) &&
995 (!device->stopped)) {
996 if (device->discipline->start_IO(next) == 0)
997 expires = next->expires;
999 DEV_MESSAGE(KERN_DEBUG, device, "%s",
1000 "Interrupt fastpath "
1004 } else { /* error */
1005 memcpy(&cqr->irb, irb, sizeof (struct irb));
1007 /* dump sense data */
1008 dasd_log_sense(cqr, irb);
1011 case dasd_era_fatal:
1012 cqr->status = DASD_CQR_FAILED;
1015 case dasd_era_recover:
1016 cqr->status = DASD_CQR_ERROR;
1023 dasd_set_timer(device, expires);
1025 dasd_clear_timer(device);
1026 dasd_schedule_bh(device);
1030 * posts the buffer_cache about a finalized request
1033 dasd_end_request(struct request *req, int uptodate)
1035 if (end_that_request_first(req, uptodate, req->hard_nr_sectors))
1037 add_disk_randomness(req->rq_disk);
1038 end_that_request_last(req);
1042 * Process finished error recovery ccw.
1045 __dasd_process_erp(struct dasd_device *device, struct dasd_ccw_req *cqr)
1047 dasd_erp_fn_t erp_fn;
1049 if (cqr->status == DASD_CQR_DONE)
1050 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
1052 DEV_MESSAGE(KERN_ERR, device, "%s", "ERP unsuccessful");
1053 erp_fn = device->discipline->erp_postaction(cqr);
1058 * Process ccw request queue.
1061 __dasd_process_ccw_queue(struct dasd_device * device,
1062 struct list_head *final_queue)
1064 struct list_head *l, *n;
1065 struct dasd_ccw_req *cqr;
1066 dasd_erp_fn_t erp_fn;
1069 /* Process request with final status. */
1070 list_for_each_safe(l, n, &device->ccw_queue) {
1071 cqr = list_entry(l, struct dasd_ccw_req, list);
1072 /* Stop list processing at the first non-final request. */
1073 if (cqr->status != DASD_CQR_DONE &&
1074 cqr->status != DASD_CQR_FAILED &&
1075 cqr->status != DASD_CQR_ERROR)
1077 /* Process requests with DASD_CQR_ERROR */
1078 if (cqr->status == DASD_CQR_ERROR) {
1079 if (cqr->irb.scsw.fctl & SCSW_FCTL_HALT_FUNC) {
1080 cqr->status = DASD_CQR_FAILED;
1081 cqr->stopclk = get_clock();
1083 if (cqr->irb.esw.esw0.erw.cons) {
1084 erp_fn = device->discipline->
1088 dasd_default_erp_action(cqr);
1092 /* Process finished ERP request. */
1094 __dasd_process_erp(device, cqr);
1098 /* Rechain finished requests to final queue */
1099 cqr->endclk = get_clock();
1100 list_move_tail(&cqr->list, final_queue);
1105 dasd_end_request_cb(struct dasd_ccw_req * cqr, void *data)
1107 struct request *req;
1108 struct dasd_device *device;
1111 req = (struct request *) data;
1112 device = cqr->device;
1113 dasd_profile_end(device, cqr, req);
1114 status = cqr->device->discipline->free_cp(cqr,req);
1115 spin_lock_irq(&device->request_queue_lock);
1116 dasd_end_request(req, status);
1117 spin_unlock_irq(&device->request_queue_lock);
1122 * Fetch requests from the block device queue.
1125 __dasd_process_blk_queue(struct dasd_device * device)
1127 request_queue_t *queue;
1128 struct request *req;
1129 struct dasd_ccw_req *cqr;
1132 queue = device->request_queue;
1133 /* No queue ? Then there is nothing to do. */
1138 * We requeue request from the block device queue to the ccw
1139 * queue only in two states. In state DASD_STATE_READY the
1140 * partition detection is done and we need to requeue requests
1141 * for that. State DASD_STATE_ONLINE is normal block device
1144 if (device->state != DASD_STATE_READY &&
1145 device->state != DASD_STATE_ONLINE)
1148 /* Now we try to fetch requests from the request queue */
1149 list_for_each_entry(cqr, &device->ccw_queue, list)
1150 if (cqr->status == DASD_CQR_QUEUED)
1152 while (!blk_queue_plugged(queue) &&
1153 elv_next_request(queue) &&
1154 nr_queued < DASD_CHANQ_MAX_SIZE) {
1155 req = elv_next_request(queue);
1157 if (device->features & DASD_FEATURE_READONLY &&
1158 rq_data_dir(req) == WRITE) {
1159 DBF_DEV_EVENT(DBF_ERR, device,
1160 "Rejecting write request %p",
1162 blkdev_dequeue_request(req);
1163 dasd_end_request(req, 0);
1166 if (device->stopped & DASD_STOPPED_DC_EIO) {
1167 blkdev_dequeue_request(req);
1168 dasd_end_request(req, 0);
1171 cqr = device->discipline->build_cp(device, req);
1173 if (PTR_ERR(cqr) == -ENOMEM)
1174 break; /* terminate request queue loop */
1175 DBF_DEV_EVENT(DBF_ERR, device,
1176 "CCW creation failed (rc=%ld) "
1179 blkdev_dequeue_request(req);
1180 dasd_end_request(req, 0);
1183 cqr->callback = dasd_end_request_cb;
1184 cqr->callback_data = (void *) req;
1185 cqr->status = DASD_CQR_QUEUED;
1186 blkdev_dequeue_request(req);
1187 list_add_tail(&cqr->list, &device->ccw_queue);
1188 dasd_profile_start(device, cqr, req);
1194 * Take a look at the first request on the ccw queue and check
1195 * if it reached its expire time. If so, terminate the IO.
1198 __dasd_check_expire(struct dasd_device * device)
1200 struct dasd_ccw_req *cqr;
1202 if (list_empty(&device->ccw_queue))
1204 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list);
1205 if (cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) {
1206 if (time_after_eq(jiffies, cqr->expires + cqr->starttime)) {
1207 if (device->discipline->term_IO(cqr) != 0)
1208 /* Hmpf, try again in 1/10 sec */
1209 dasd_set_timer(device, 10);
1215 * Take a look at the first request on the ccw queue and check
1216 * if it needs to be started.
1219 __dasd_start_head(struct dasd_device * device)
1221 struct dasd_ccw_req *cqr;
1224 if (list_empty(&device->ccw_queue))
1226 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list);
1227 if ((cqr->status == DASD_CQR_QUEUED) &&
1228 (!device->stopped)) {
1229 /* try to start the first I/O that can be started */
1230 rc = device->discipline->start_IO(cqr);
1232 dasd_set_timer(device, cqr->expires);
1233 else if (rc == -EACCES) {
1234 dasd_schedule_bh(device);
1236 /* Hmpf, try again in 1/2 sec */
1237 dasd_set_timer(device, 50);
1242 * Remove requests from the ccw queue.
1245 dasd_flush_ccw_queue(struct dasd_device * device, int all)
1247 struct list_head flush_queue;
1248 struct list_head *l, *n;
1249 struct dasd_ccw_req *cqr;
1251 INIT_LIST_HEAD(&flush_queue);
1252 spin_lock_irq(get_ccwdev_lock(device->cdev));
1253 list_for_each_safe(l, n, &device->ccw_queue) {
1254 cqr = list_entry(l, struct dasd_ccw_req, list);
1255 /* Flush all request or only block device requests? */
1256 if (all == 0 && cqr->callback == dasd_end_request_cb)
1258 if (cqr->status == DASD_CQR_IN_IO)
1259 device->discipline->term_IO(cqr);
1260 if (cqr->status != DASD_CQR_DONE ||
1261 cqr->status != DASD_CQR_FAILED) {
1262 cqr->status = DASD_CQR_FAILED;
1263 cqr->stopclk = get_clock();
1265 /* Process finished ERP request. */
1267 __dasd_process_erp(device, cqr);
1270 /* Rechain request on device request queue */
1271 cqr->endclk = get_clock();
1272 list_move_tail(&cqr->list, &flush_queue);
1274 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1275 /* Now call the callback function of flushed requests */
1276 list_for_each_safe(l, n, &flush_queue) {
1277 cqr = list_entry(l, struct dasd_ccw_req, list);
1278 if (cqr->callback != NULL)
1279 (cqr->callback)(cqr, cqr->callback_data);
1284 * Acquire the device lock and process queues for the device.
1287 dasd_tasklet(struct dasd_device * device)
1289 struct list_head final_queue;
1290 struct list_head *l, *n;
1291 struct dasd_ccw_req *cqr;
1293 atomic_set (&device->tasklet_scheduled, 0);
1294 INIT_LIST_HEAD(&final_queue);
1295 spin_lock_irq(get_ccwdev_lock(device->cdev));
1296 /* Check expire time of first request on the ccw queue. */
1297 __dasd_check_expire(device);
1298 /* Finish off requests on ccw queue */
1299 __dasd_process_ccw_queue(device, &final_queue);
1300 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1301 /* Now call the callback function of requests with final status */
1302 list_for_each_safe(l, n, &final_queue) {
1303 cqr = list_entry(l, struct dasd_ccw_req, list);
1304 list_del(&cqr->list);
1305 if (cqr->callback != NULL)
1306 (cqr->callback)(cqr, cqr->callback_data);
1308 spin_lock_irq(&device->request_queue_lock);
1309 spin_lock(get_ccwdev_lock(device->cdev));
1310 /* Get new request from the block device request queue */
1311 __dasd_process_blk_queue(device);
1312 /* Now check if the head of the ccw queue needs to be started. */
1313 __dasd_start_head(device);
1314 spin_unlock(get_ccwdev_lock(device->cdev));
1315 spin_unlock_irq(&device->request_queue_lock);
1316 dasd_put_device(device);
1320 * Schedules a call to dasd_tasklet over the device tasklet.
1323 dasd_schedule_bh(struct dasd_device * device)
1325 /* Protect against rescheduling. */
1326 if (atomic_compare_and_swap (0, 1, &device->tasklet_scheduled))
1328 dasd_get_device(device);
1329 tasklet_hi_schedule(&device->tasklet);
1333 * Queue a request to the head of the ccw_queue. Start the I/O if
1337 dasd_add_request_head(struct dasd_ccw_req *req)
1339 struct dasd_device *device;
1340 unsigned long flags;
1342 device = req->device;
1343 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1344 req->status = DASD_CQR_QUEUED;
1345 req->device = device;
1346 list_add(&req->list, &device->ccw_queue);
1347 /* let the bh start the request to keep them in order */
1348 dasd_schedule_bh(device);
1349 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1353 * Queue a request to the tail of the ccw_queue. Start the I/O if
1357 dasd_add_request_tail(struct dasd_ccw_req *req)
1359 struct dasd_device *device;
1360 unsigned long flags;
1362 device = req->device;
1363 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1364 req->status = DASD_CQR_QUEUED;
1365 req->device = device;
1366 list_add_tail(&req->list, &device->ccw_queue);
1367 /* let the bh start the request to keep them in order */
1368 dasd_schedule_bh(device);
1369 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1376 dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
1378 wake_up((wait_queue_head_t *) data);
1382 _wait_for_wakeup(struct dasd_ccw_req *cqr)
1384 struct dasd_device *device;
1387 device = cqr->device;
1388 spin_lock_irq(get_ccwdev_lock(device->cdev));
1389 rc = cqr->status == DASD_CQR_DONE || cqr->status == DASD_CQR_FAILED;
1390 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1395 * Attempts to start a special ccw queue and waits for its completion.
1398 dasd_sleep_on(struct dasd_ccw_req * cqr)
1400 wait_queue_head_t wait_q;
1401 struct dasd_device *device;
1404 device = cqr->device;
1405 spin_lock_irq(get_ccwdev_lock(device->cdev));
1407 init_waitqueue_head (&wait_q);
1408 cqr->callback = dasd_wakeup_cb;
1409 cqr->callback_data = (void *) &wait_q;
1410 cqr->status = DASD_CQR_QUEUED;
1411 list_add_tail(&cqr->list, &device->ccw_queue);
1413 /* let the bh start the request to keep them in order */
1414 dasd_schedule_bh(device);
1416 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1418 wait_event(wait_q, _wait_for_wakeup(cqr));
1420 /* Request status is either done or failed. */
1421 rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0;
1426 * Attempts to start a special ccw queue and wait interruptible
1427 * for its completion.
1430 dasd_sleep_on_interruptible(struct dasd_ccw_req * cqr)
1432 wait_queue_head_t wait_q;
1433 struct dasd_device *device;
1436 device = cqr->device;
1437 spin_lock_irq(get_ccwdev_lock(device->cdev));
1439 init_waitqueue_head (&wait_q);
1440 cqr->callback = dasd_wakeup_cb;
1441 cqr->callback_data = (void *) &wait_q;
1442 cqr->status = DASD_CQR_QUEUED;
1443 list_add_tail(&cqr->list, &device->ccw_queue);
1445 /* let the bh start the request to keep them in order */
1446 dasd_schedule_bh(device);
1447 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1451 rc = wait_event_interruptible(wait_q, _wait_for_wakeup(cqr));
1452 if (rc != -ERESTARTSYS) {
1453 /* Request status is either done or failed. */
1454 rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0;
1457 spin_lock_irq(get_ccwdev_lock(device->cdev));
1458 if (cqr->status == DASD_CQR_IN_IO &&
1459 device->discipline->term_IO(cqr) == 0) {
1460 list_del(&cqr->list);
1463 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1469 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
1470 * for eckd devices) the currently running request has to be terminated
1471 * and be put back to status queued, before the special request is added
1472 * to the head of the queue. Then the special request is waited on normally.
1475 _dasd_term_running_cqr(struct dasd_device *device)
1477 struct dasd_ccw_req *cqr;
1480 if (list_empty(&device->ccw_queue))
1482 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list);
1483 rc = device->discipline->term_IO(cqr);
1485 /* termination successful */
1486 cqr->status = DASD_CQR_QUEUED;
1487 cqr->startclk = cqr->stopclk = 0;
1494 dasd_sleep_on_immediatly(struct dasd_ccw_req * cqr)
1496 wait_queue_head_t wait_q;
1497 struct dasd_device *device;
1500 device = cqr->device;
1501 spin_lock_irq(get_ccwdev_lock(device->cdev));
1502 rc = _dasd_term_running_cqr(device);
1504 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1508 init_waitqueue_head (&wait_q);
1509 cqr->callback = dasd_wakeup_cb;
1510 cqr->callback_data = (void *) &wait_q;
1511 cqr->status = DASD_CQR_QUEUED;
1512 list_add(&cqr->list, &device->ccw_queue);
1514 /* let the bh start the request to keep them in order */
1515 dasd_schedule_bh(device);
1517 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1519 wait_event(wait_q, _wait_for_wakeup(cqr));
1521 /* Request status is either done or failed. */
1522 rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0;
1527 * Cancels a request that was started with dasd_sleep_on_req.
1528 * This is useful to timeout requests. The request will be
1529 * terminated if it is currently in i/o.
1530 * Returns 1 if the request has been terminated.
1533 dasd_cancel_req(struct dasd_ccw_req *cqr)
1535 struct dasd_device *device = cqr->device;
1536 unsigned long flags;
1540 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1541 switch (cqr->status) {
1542 case DASD_CQR_QUEUED:
1543 /* request was not started - just set to failed */
1544 cqr->status = DASD_CQR_FAILED;
1546 case DASD_CQR_IN_IO:
1547 /* request in IO - terminate IO and release again */
1548 if (device->discipline->term_IO(cqr) != 0)
1549 /* what to do if unable to terminate ??????
1551 cqr->status = DASD_CQR_FAILED;
1552 cqr->stopclk = get_clock();
1556 case DASD_CQR_FAILED:
1557 /* already finished - do nothing */
1560 DEV_MESSAGE(KERN_ALERT, device,
1561 "invalid status %02x in request",
1566 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1567 dasd_schedule_bh(device);
1572 * SECTION: Block device operations (request queue, partitions, open, release).
1576 * Dasd request queue function. Called from ll_rw_blk.c
1579 do_dasd_request(request_queue_t * queue)
1581 struct dasd_device *device;
1583 device = (struct dasd_device *) queue->queuedata;
1584 spin_lock(get_ccwdev_lock(device->cdev));
1585 /* Get new request from the block device request queue */
1586 __dasd_process_blk_queue(device);
1587 /* Now check if the head of the ccw queue needs to be started. */
1588 __dasd_start_head(device);
1589 spin_unlock(get_ccwdev_lock(device->cdev));
1593 * Allocate and initialize request queue and default I/O scheduler.
1596 dasd_alloc_queue(struct dasd_device * device)
1600 device->request_queue = blk_init_queue(do_dasd_request,
1601 &device->request_queue_lock);
1602 if (device->request_queue == NULL)
1605 device->request_queue->queuedata = device;
1607 elevator_exit(device->request_queue->elevator);
1608 rc = elevator_init(device->request_queue, "deadline");
1610 blk_cleanup_queue(device->request_queue);
1617 * Allocate and initialize request queue.
1620 dasd_setup_queue(struct dasd_device * device)
1624 blk_queue_hardsect_size(device->request_queue, device->bp_block);
1625 max = device->discipline->max_blocks << device->s2b_shift;
1626 blk_queue_max_sectors(device->request_queue, max);
1627 blk_queue_max_phys_segments(device->request_queue, -1L);
1628 blk_queue_max_hw_segments(device->request_queue, -1L);
1629 blk_queue_max_segment_size(device->request_queue, -1L);
1630 blk_queue_segment_boundary(device->request_queue, -1L);
1631 blk_queue_ordered(device->request_queue, 1);
1635 * Deactivate and free request queue.
1638 dasd_free_queue(struct dasd_device * device)
1640 if (device->request_queue) {
1641 blk_cleanup_queue(device->request_queue);
1642 device->request_queue = NULL;
1647 * Flush request on the request queue.
1650 dasd_flush_request_queue(struct dasd_device * device)
1652 struct request *req;
1654 if (!device->request_queue)
1657 spin_lock_irq(&device->request_queue_lock);
1658 while (!list_empty(&device->request_queue->queue_head)) {
1659 req = elv_next_request(device->request_queue);
1662 dasd_end_request(req, 0);
1663 blkdev_dequeue_request(req);
1665 spin_unlock_irq(&device->request_queue_lock);
1669 dasd_open(struct inode *inp, struct file *filp)
1671 struct gendisk *disk = inp->i_bdev->bd_disk;
1672 struct dasd_device *device = disk->private_data;
1675 atomic_inc(&device->open_count);
1676 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
1681 if (!try_module_get(device->discipline->owner)) {
1686 if (dasd_probeonly) {
1687 DEV_MESSAGE(KERN_INFO, device, "%s",
1688 "No access to device due to probeonly mode");
1693 if (device->state < DASD_STATE_BASIC) {
1694 DBF_DEV_EVENT(DBF_ERR, device, " %s",
1695 " Cannot open unrecognized device");
1703 module_put(device->discipline->owner);
1705 atomic_dec(&device->open_count);
1710 dasd_release(struct inode *inp, struct file *filp)
1712 struct gendisk *disk = inp->i_bdev->bd_disk;
1713 struct dasd_device *device = disk->private_data;
1715 atomic_dec(&device->open_count);
1716 module_put(device->discipline->owner);
1720 struct block_device_operations
1721 dasd_device_operations = {
1722 .owner = THIS_MODULE,
1724 .release = dasd_release,
1725 .ioctl = dasd_ioctl,
1732 #ifdef CONFIG_PROC_FS
1736 if (dasd_page_cache != NULL) {
1737 kmem_cache_destroy(dasd_page_cache);
1738 dasd_page_cache = NULL;
1740 dasd_gendisk_exit();
1742 devfs_remove("dasd");
1743 if (dasd_debug_area != NULL) {
1744 debug_unregister(dasd_debug_area);
1745 dasd_debug_area = NULL;
1750 * SECTION: common functions for ccw_driver use
1753 /* initial attempt at a probe function. this can be simplified once
1754 * the other detection code is gone */
1756 dasd_generic_probe (struct ccw_device *cdev,
1757 struct dasd_discipline *discipline)
1761 ret = dasd_add_sysfs_files(cdev);
1764 "dasd_generic_probe: could not add sysfs entries "
1765 "for %s\n", cdev->dev.bus_id);
1767 cdev->handler = &dasd_int_handler;
1773 /* this will one day be called from a global not_oper handler.
1774 * It is also used by driver_unregister during module unload */
1776 dasd_generic_remove (struct ccw_device *cdev)
1778 struct dasd_device *device;
1780 cdev->handler = NULL;
1782 dasd_remove_sysfs_files(cdev);
1783 device = dasd_device_from_cdev(cdev);
1786 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
1787 /* Already doing offline processing */
1788 dasd_put_device(device);
1792 * This device is removed unconditionally. Set offline
1793 * flag to prevent dasd_open from opening it while it is
1794 * no quite down yet.
1796 dasd_set_target_state(device, DASD_STATE_NEW);
1797 /* dasd_delete_device destroys the device reference. */
1798 dasd_delete_device(device);
1801 /* activate a device. This is called from dasd_{eckd,fba}_probe() when either
1802 * the device is detected for the first time and is supposed to be used
1803 * or the user has started activation through sysfs */
1805 dasd_generic_set_online (struct ccw_device *cdev,
1806 struct dasd_discipline *discipline)
1809 struct dasd_device *device;
1812 device = dasd_create_device(cdev);
1814 return PTR_ERR(device);
1816 if (device->features & DASD_FEATURE_USEDIAG) {
1817 if (!dasd_diag_discipline_pointer) {
1818 printk (KERN_WARNING
1819 "dasd_generic couldn't online device %s "
1820 "- discipline DIAG not available\n",
1822 dasd_delete_device(device);
1825 discipline = dasd_diag_discipline_pointer;
1827 device->discipline = discipline;
1829 rc = discipline->check_device(device);
1831 printk (KERN_WARNING
1832 "dasd_generic couldn't online device %s "
1833 "with discipline %s rc=%i\n",
1834 cdev->dev.bus_id, discipline->name, rc);
1835 dasd_delete_device(device);
1839 dasd_set_target_state(device, DASD_STATE_ONLINE);
1840 if (device->state <= DASD_STATE_KNOWN) {
1841 printk (KERN_WARNING
1842 "dasd_generic discipline not found for %s\n",
1845 dasd_set_target_state(device, DASD_STATE_NEW);
1846 dasd_delete_device(device);
1848 pr_debug("dasd_generic device %s found\n",
1851 /* FIXME: we have to wait for the root device but we don't want
1852 * to wait for each single device but for all at once. */
1853 wait_event(dasd_init_waitq, _wait_for_device(device));
1855 dasd_put_device(device);
1861 dasd_generic_set_offline (struct ccw_device *cdev)
1863 struct dasd_device *device;
1866 device = dasd_device_from_cdev(cdev);
1868 return PTR_ERR(device);
1869 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
1870 /* Already doing offline processing */
1871 dasd_put_device(device);
1875 * We must make sure that this device is currently not in use.
1876 * The open_count is increased for every opener, that includes
1877 * the blkdev_get in dasd_scan_partitions. We are only interested
1878 * in the other openers.
1880 max_count = device->bdev ? 0 : -1;
1881 if (atomic_read(&device->open_count) > max_count) {
1882 printk (KERN_WARNING "Can't offline dasd device with open"
1884 atomic_read(&device->open_count));
1885 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
1886 dasd_put_device(device);
1889 dasd_set_target_state(device, DASD_STATE_NEW);
1890 /* dasd_delete_device destroys the device reference. */
1891 dasd_delete_device(device);
1897 dasd_generic_notify(struct ccw_device *cdev, int event)
1899 struct dasd_device *device;
1900 struct dasd_ccw_req *cqr;
1901 unsigned long flags;
1904 device = dasd_device_from_cdev(cdev);
1907 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1912 if (device->state < DASD_STATE_BASIC)
1914 /* Device is active. We want to keep it. */
1915 if (test_bit(DASD_FLAG_DSC_ERROR, &device->flags)) {
1916 list_for_each_entry(cqr, &device->ccw_queue, list)
1917 if (cqr->status == DASD_CQR_IN_IO)
1918 cqr->status = DASD_CQR_FAILED;
1919 device->stopped |= DASD_STOPPED_DC_EIO;
1920 dasd_schedule_bh(device);
1922 list_for_each_entry(cqr, &device->ccw_queue, list)
1923 if (cqr->status == DASD_CQR_IN_IO) {
1924 cqr->status = DASD_CQR_QUEUED;
1927 device->stopped |= DASD_STOPPED_DC_WAIT;
1928 dasd_set_timer(device, 0);
1933 /* FIXME: add a sanity check. */
1934 device->stopped &= ~(DASD_STOPPED_DC_WAIT|DASD_STOPPED_DC_EIO);
1935 dasd_schedule_bh(device);
1939 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1940 dasd_put_device(device);
1945 * Automatically online either all dasd devices (dasd_autodetect) or
1946 * all devices specified with dasd= parameters.
1949 __dasd_auto_online(struct device *dev, void *data)
1951 struct ccw_device *cdev;
1953 cdev = to_ccwdev(dev);
1954 if (dasd_autodetect || dasd_busid_known(cdev->dev.bus_id) == 0)
1955 ccw_device_set_online(cdev);
1960 dasd_generic_auto_online (struct ccw_driver *dasd_discipline_driver)
1962 struct device_driver *drv;
1964 drv = get_driver(&dasd_discipline_driver->driver);
1965 driver_for_each_device(drv, NULL, NULL, __dasd_auto_online);
1974 init_waitqueue_head(&dasd_init_waitq);
1976 /* register 'common' DASD debug area, used for all DBF_XXX calls */
1977 dasd_debug_area = debug_register("dasd", 1, 2, 8 * sizeof (long));
1978 if (dasd_debug_area == NULL) {
1982 debug_register_view(dasd_debug_area, &debug_sprintf_view);
1983 debug_set_level(dasd_debug_area, DBF_EMERG);
1985 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
1987 dasd_diag_discipline_pointer = NULL;
1989 rc = devfs_mk_dir("dasd");
1992 rc = dasd_devmap_init();
1995 rc = dasd_gendisk_init();
2001 rc = dasd_ioctl_init();
2004 #ifdef CONFIG_PROC_FS
2005 rc = dasd_proc_init();
2012 MESSAGE(KERN_INFO, "%s", "initialization not performed due to errors");
2017 module_init(dasd_init);
2018 module_exit(dasd_exit);
2020 EXPORT_SYMBOL(dasd_debug_area);
2021 EXPORT_SYMBOL(dasd_diag_discipline_pointer);
2023 EXPORT_SYMBOL(dasd_add_request_head);
2024 EXPORT_SYMBOL(dasd_add_request_tail);
2025 EXPORT_SYMBOL(dasd_cancel_req);
2026 EXPORT_SYMBOL(dasd_clear_timer);
2027 EXPORT_SYMBOL(dasd_enable_device);
2028 EXPORT_SYMBOL(dasd_int_handler);
2029 EXPORT_SYMBOL(dasd_kfree_request);
2030 EXPORT_SYMBOL(dasd_kick_device);
2031 EXPORT_SYMBOL(dasd_kmalloc_request);
2032 EXPORT_SYMBOL(dasd_schedule_bh);
2033 EXPORT_SYMBOL(dasd_set_target_state);
2034 EXPORT_SYMBOL(dasd_set_timer);
2035 EXPORT_SYMBOL(dasd_sfree_request);
2036 EXPORT_SYMBOL(dasd_sleep_on);
2037 EXPORT_SYMBOL(dasd_sleep_on_immediatly);
2038 EXPORT_SYMBOL(dasd_sleep_on_interruptible);
2039 EXPORT_SYMBOL(dasd_smalloc_request);
2040 EXPORT_SYMBOL(dasd_start_IO);
2041 EXPORT_SYMBOL(dasd_term_IO);
2043 EXPORT_SYMBOL_GPL(dasd_generic_probe);
2044 EXPORT_SYMBOL_GPL(dasd_generic_remove);
2045 EXPORT_SYMBOL_GPL(dasd_generic_notify);
2046 EXPORT_SYMBOL_GPL(dasd_generic_set_online);
2047 EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
2048 EXPORT_SYMBOL_GPL(dasd_generic_auto_online);
2051 * Overrides for Emacs so that we follow Linus's tabbing style.
2052 * Emacs will notice this stuff at the end of the file and automatically
2053 * adjust the settings for this buffer only. This must remain at the end
2055 * ---------------------------------------------------------------------------
2058 * c-brace-imaginary-offset: 0
2059 * c-brace-offset: -4
2060 * c-argdecl-indent: 4
2061 * c-label-offset: -4
2062 * c-continued-statement-offset: 4
2063 * c-continued-brace-offset: 0
2064 * indent-tabs-mode: 1