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)
119 kfree(device->private);
120 free_page((unsigned long) device->erp_mem);
121 free_pages((unsigned long) device->ccw_mem, 1);
126 * Make a new device known to the system.
129 dasd_state_new_to_known(struct dasd_device *device)
134 * As long as the device is not in state DASD_STATE_NEW we want to
135 * keep the reference count > 0.
137 dasd_get_device(device);
139 rc = dasd_alloc_queue(device);
141 dasd_put_device(device);
145 device->state = DASD_STATE_KNOWN;
150 * Let the system forget about a device.
153 dasd_state_known_to_new(struct dasd_device * device)
155 /* Forget the discipline information. */
156 device->discipline = NULL;
157 device->state = DASD_STATE_NEW;
159 dasd_free_queue(device);
161 /* Give up reference we took in dasd_state_new_to_known. */
162 dasd_put_device(device);
166 * Request the irq line for the device.
169 dasd_state_known_to_basic(struct dasd_device * device)
173 /* Allocate and register gendisk structure. */
174 rc = dasd_gendisk_alloc(device);
178 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
179 device->debug_area = debug_register(device->cdev->dev.bus_id, 0, 2,
181 debug_register_view(device->debug_area, &debug_sprintf_view);
182 debug_set_level(device->debug_area, DBF_ERR);
183 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
185 device->state = DASD_STATE_BASIC;
190 * Release the irq line for the device. Terminate any running i/o.
193 dasd_state_basic_to_known(struct dasd_device * device)
195 dasd_gendisk_free(device);
196 dasd_flush_ccw_queue(device, 1);
197 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
198 if (device->debug_area != NULL) {
199 debug_unregister(device->debug_area);
200 device->debug_area = NULL;
202 device->state = DASD_STATE_KNOWN;
206 * Do the initial analysis. The do_analysis function may return
207 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
208 * until the discipline decides to continue the startup sequence
209 * by calling the function dasd_change_state. The eckd disciplines
210 * uses this to start a ccw that detects the format. The completion
211 * interrupt for this detection ccw uses the kernel event daemon to
212 * trigger the call to dasd_change_state. All this is done in the
213 * discipline code, see dasd_eckd.c.
214 * After the analysis ccw is done (do_analysis returned 0 or error)
215 * the block device is setup. Either a fake disk is added to allow
216 * formatting or a proper device request queue is created.
219 dasd_state_basic_to_ready(struct dasd_device * device)
224 if (device->discipline->do_analysis != NULL)
225 rc = device->discipline->do_analysis(device);
228 dasd_setup_queue(device);
229 device->state = DASD_STATE_READY;
230 if (dasd_scan_partitions(device) != 0)
231 device->state = DASD_STATE_BASIC;
236 * Remove device from block device layer. Destroy dirty buffers.
237 * Forget format information. Check if the target level is basic
238 * and if it is create fake disk for formatting.
241 dasd_state_ready_to_basic(struct dasd_device * device)
243 dasd_flush_ccw_queue(device, 0);
244 dasd_destroy_partitions(device);
245 dasd_flush_request_queue(device);
247 device->bp_block = 0;
248 device->s2b_shift = 0;
249 device->state = DASD_STATE_BASIC;
253 * Make the device online and schedule the bottom half to start
254 * the requeueing of requests from the linux request queue to the
258 dasd_state_ready_to_online(struct dasd_device * device)
260 device->state = DASD_STATE_ONLINE;
261 dasd_schedule_bh(device);
266 * Stop the requeueing of requests again.
269 dasd_state_online_to_ready(struct dasd_device * device)
271 device->state = DASD_STATE_READY;
275 * Device startup state changes.
278 dasd_increase_state(struct dasd_device *device)
283 if (device->state == DASD_STATE_NEW &&
284 device->target >= DASD_STATE_KNOWN)
285 rc = dasd_state_new_to_known(device);
288 device->state == DASD_STATE_KNOWN &&
289 device->target >= DASD_STATE_BASIC)
290 rc = dasd_state_known_to_basic(device);
293 device->state == DASD_STATE_BASIC &&
294 device->target >= DASD_STATE_READY)
295 rc = dasd_state_basic_to_ready(device);
298 device->state == DASD_STATE_READY &&
299 device->target >= DASD_STATE_ONLINE)
300 rc = dasd_state_ready_to_online(device);
306 * Device shutdown state changes.
309 dasd_decrease_state(struct dasd_device *device)
311 if (device->state == DASD_STATE_ONLINE &&
312 device->target <= DASD_STATE_READY)
313 dasd_state_online_to_ready(device);
315 if (device->state == DASD_STATE_READY &&
316 device->target <= DASD_STATE_BASIC)
317 dasd_state_ready_to_basic(device);
319 if (device->state == DASD_STATE_BASIC &&
320 device->target <= DASD_STATE_KNOWN)
321 dasd_state_basic_to_known(device);
323 if (device->state == DASD_STATE_KNOWN &&
324 device->target <= DASD_STATE_NEW)
325 dasd_state_known_to_new(device);
331 * This is the main startup/shutdown routine.
334 dasd_change_state(struct dasd_device *device)
338 if (device->state == device->target)
339 /* Already where we want to go today... */
341 if (device->state < device->target)
342 rc = dasd_increase_state(device);
344 rc = dasd_decrease_state(device);
345 if (rc && rc != -EAGAIN)
346 device->target = device->state;
348 if (device->state == device->target)
349 wake_up(&dasd_init_waitq);
353 * Kick starter for devices that did not complete the startup/shutdown
354 * procedure or were sleeping because of a pending state.
355 * dasd_kick_device will schedule a call do do_kick_device to the kernel
359 do_kick_device(void *data)
361 struct dasd_device *device;
363 device = (struct dasd_device *) data;
364 dasd_change_state(device);
365 dasd_schedule_bh(device);
366 dasd_put_device(device);
370 dasd_kick_device(struct dasd_device *device)
372 dasd_get_device(device);
373 /* queue call to dasd_kick_device to the kernel event daemon. */
374 schedule_work(&device->kick_work);
378 * Set the target state for a device and starts the state change.
381 dasd_set_target_state(struct dasd_device *device, int target)
383 /* If we are in probeonly mode stop at DASD_STATE_READY. */
384 if (dasd_probeonly && target > DASD_STATE_READY)
385 target = DASD_STATE_READY;
386 if (device->target != target) {
387 if (device->state == target)
388 wake_up(&dasd_init_waitq);
389 device->target = target;
391 if (device->state != device->target)
392 dasd_change_state(device);
396 * Enable devices with device numbers in [from..to].
399 _wait_for_device(struct dasd_device *device)
401 return (device->state == device->target);
405 dasd_enable_device(struct dasd_device *device)
407 dasd_set_target_state(device, DASD_STATE_ONLINE);
408 if (device->state <= DASD_STATE_KNOWN)
409 /* No discipline for device found. */
410 dasd_set_target_state(device, DASD_STATE_NEW);
411 /* Now wait for the devices to come up. */
412 wait_event(dasd_init_waitq, _wait_for_device(device));
416 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
418 #ifdef CONFIG_DASD_PROFILE
420 struct dasd_profile_info_t dasd_global_profile;
421 unsigned int dasd_profile_level = DASD_PROFILE_OFF;
424 * Increments counter in global and local profiling structures.
426 #define dasd_profile_counter(value, counter, device) \
429 for (index = 0; index < 31 && value >> (2+index); index++); \
430 dasd_global_profile.counter[index]++; \
431 device->profile.counter[index]++; \
435 * Add profiling information for cqr before execution.
438 dasd_profile_start(struct dasd_device *device, struct dasd_ccw_req * cqr,
442 unsigned int counter;
444 if (dasd_profile_level != DASD_PROFILE_ON)
447 /* count the length of the chanq for statistics */
449 list_for_each(l, &device->ccw_queue)
452 dasd_global_profile.dasd_io_nr_req[counter]++;
453 device->profile.dasd_io_nr_req[counter]++;
457 * Add profiling information for cqr after execution.
460 dasd_profile_end(struct dasd_device *device, struct dasd_ccw_req * cqr,
463 long strtime, irqtime, endtime, tottime; /* in microseconds */
464 long tottimeps, sectors;
466 if (dasd_profile_level != DASD_PROFILE_ON)
469 sectors = req->nr_sectors;
470 if (!cqr->buildclk || !cqr->startclk ||
471 !cqr->stopclk || !cqr->endclk ||
475 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
476 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
477 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
478 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
479 tottimeps = tottime / sectors;
481 if (!dasd_global_profile.dasd_io_reqs)
482 memset(&dasd_global_profile, 0,
483 sizeof (struct dasd_profile_info_t));
484 dasd_global_profile.dasd_io_reqs++;
485 dasd_global_profile.dasd_io_sects += sectors;
487 if (!device->profile.dasd_io_reqs)
488 memset(&device->profile, 0,
489 sizeof (struct dasd_profile_info_t));
490 device->profile.dasd_io_reqs++;
491 device->profile.dasd_io_sects += sectors;
493 dasd_profile_counter(sectors, dasd_io_secs, device);
494 dasd_profile_counter(tottime, dasd_io_times, device);
495 dasd_profile_counter(tottimeps, dasd_io_timps, device);
496 dasd_profile_counter(strtime, dasd_io_time1, device);
497 dasd_profile_counter(irqtime, dasd_io_time2, device);
498 dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, device);
499 dasd_profile_counter(endtime, dasd_io_time3, device);
502 #define dasd_profile_start(device, cqr, req) do {} while (0)
503 #define dasd_profile_end(device, cqr, req) do {} while (0)
504 #endif /* CONFIG_DASD_PROFILE */
507 * Allocate memory for a channel program with 'cplength' channel
508 * command words and 'datasize' additional space. There are two
509 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
510 * memory and 2) dasd_smalloc_request uses the static ccw memory
511 * that gets allocated for each device.
513 struct dasd_ccw_req *
514 dasd_kmalloc_request(char *magic, int cplength, int datasize,
515 struct dasd_device * device)
517 struct dasd_ccw_req *cqr;
520 if ( magic == NULL || datasize > PAGE_SIZE ||
521 (cplength*sizeof(struct ccw1)) > PAGE_SIZE)
523 debug_text_event ( dasd_debug_area, 1, "ALLC");
524 debug_text_event ( dasd_debug_area, 1, magic);
525 debug_int_event ( dasd_debug_area, 1, cplength);
526 debug_int_event ( dasd_debug_area, 1, datasize);
528 cqr = kmalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
530 return ERR_PTR(-ENOMEM);
531 memset(cqr, 0, sizeof(struct dasd_ccw_req));
534 cqr->cpaddr = kmalloc(cplength*sizeof(struct ccw1),
535 GFP_ATOMIC | GFP_DMA);
536 if (cqr->cpaddr == NULL) {
538 return ERR_PTR(-ENOMEM);
540 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
544 cqr->data = kmalloc(datasize, GFP_ATOMIC | GFP_DMA);
545 if (cqr->data == NULL) {
546 if (cqr->cpaddr != NULL)
549 return ERR_PTR(-ENOMEM);
551 memset(cqr->data, 0, datasize);
553 strncpy((char *) &cqr->magic, magic, 4);
554 ASCEBC((char *) &cqr->magic, 4);
555 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
556 dasd_get_device(device);
560 struct dasd_ccw_req *
561 dasd_smalloc_request(char *magic, int cplength, int datasize,
562 struct dasd_device * device)
565 struct dasd_ccw_req *cqr;
570 if ( magic == NULL || datasize > PAGE_SIZE ||
571 (cplength*sizeof(struct ccw1)) > PAGE_SIZE)
573 debug_text_event ( dasd_debug_area, 1, "ALLC");
574 debug_text_event ( dasd_debug_area, 1, magic);
575 debug_int_event ( dasd_debug_area, 1, cplength);
576 debug_int_event ( dasd_debug_area, 1, datasize);
578 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
580 size += cplength * sizeof(struct ccw1);
583 spin_lock_irqsave(&device->mem_lock, flags);
584 cqr = (struct dasd_ccw_req *)
585 dasd_alloc_chunk(&device->ccw_chunks, size);
586 spin_unlock_irqrestore(&device->mem_lock, flags);
588 return ERR_PTR(-ENOMEM);
589 memset(cqr, 0, sizeof(struct dasd_ccw_req));
590 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
593 cqr->cpaddr = (struct ccw1 *) data;
594 data += cplength*sizeof(struct ccw1);
595 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
600 memset(cqr->data, 0, datasize);
602 strncpy((char *) &cqr->magic, magic, 4);
603 ASCEBC((char *) &cqr->magic, 4);
604 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
605 dasd_get_device(device);
610 * Free memory of a channel program. This function needs to free all the
611 * idal lists that might have been created by dasd_set_cda and the
612 * struct dasd_ccw_req itself.
615 dasd_kfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device)
617 #ifdef CONFIG_ARCH_S390X
620 /* Clear any idals used for the request. */
623 clear_normalized_cda(ccw);
624 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
626 if (cqr->dstat != NULL)
628 debug_text_event ( dasd_debug_area, 1, "FREE");
629 debug_int_event ( dasd_debug_area, 1, (long) cqr);
630 if (cqr->cpaddr != NULL)
632 if (cqr->data != NULL)
635 dasd_put_device(device);
639 dasd_sfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device)
643 if (cqr->dstat != NULL)
645 debug_text_event(dasd_debug_area, 1, "FREE");
646 debug_int_event(dasd_debug_area, 1, (long) cqr);
647 spin_lock_irqsave(&device->mem_lock, flags);
648 dasd_free_chunk(&device->ccw_chunks, cqr);
649 spin_unlock_irqrestore(&device->mem_lock, flags);
650 dasd_put_device(device);
654 * Check discipline magic in cqr.
657 dasd_check_cqr(struct dasd_ccw_req *cqr)
659 struct dasd_device *device;
663 device = cqr->device;
664 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
665 DEV_MESSAGE(KERN_WARNING, device,
666 " dasd_ccw_req 0x%08x magic doesn't match"
667 " discipline 0x%08x",
669 *(unsigned int *) device->discipline->name);
676 * Terminate the current i/o and set the request to failed.
677 * ccw_device_clear can fail if the i/o subsystem
681 dasd_term_IO(struct dasd_ccw_req * cqr)
683 struct dasd_device *device;
687 rc = dasd_check_cqr(cqr);
691 device = (struct dasd_device *) cqr->device;
692 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
693 rc = ccw_device_clear(device->cdev, (long) cqr);
695 case 0: /* termination successful */
696 if (cqr->retries > 0) {
698 cqr->status = DASD_CQR_QUEUED;
700 cqr->status = DASD_CQR_FAILED;
701 cqr->stopclk = get_clock();
704 DBF_DEV_EVENT(DBF_ERR, device, "%s",
705 "device gone, retry");
708 DBF_DEV_EVENT(DBF_ERR, device, "%s",
713 DBF_DEV_EVENT(DBF_ERR, device, "%s",
714 "device busy, retry later");
717 DEV_MESSAGE(KERN_ERR, device,
718 "line %d unknown RC=%d, please "
719 "report to linux390@de.ibm.com",
726 dasd_schedule_bh(device);
731 * Start the i/o. This start_IO can fail if the channel is really busy.
732 * In that case set up a timer to start the request later.
735 dasd_start_IO(struct dasd_ccw_req * cqr)
737 struct dasd_device *device;
741 rc = dasd_check_cqr(cqr);
744 device = (struct dasd_device *) cqr->device;
745 cqr->startclk = get_clock();
746 cqr->starttime = jiffies;
747 rc = ccw_device_start(device->cdev, cqr->cpaddr, (long) cqr,
751 cqr->status = DASD_CQR_IN_IO;
754 DBF_DEV_EVENT(DBF_ERR, device, "%s",
755 "start_IO: device busy, retry later");
758 DBF_DEV_EVENT(DBF_ERR, device, "%s",
759 "start_IO: request timeout, retry later");
763 DBF_DEV_EVENT(DBF_ERR, device, "%s",
764 "start_IO: device gone, retry");
767 DEV_MESSAGE(KERN_ERR, device,
768 "line %d unknown RC=%d, please report"
769 " to linux390@de.ibm.com", __LINE__, rc);
777 * Timeout function for dasd devices. This is used for different purposes
778 * 1) missing interrupt handler for normal operation
779 * 2) delayed start of request where start_IO failed with -EBUSY
780 * 3) timeout for missing state change interrupts
781 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
782 * DASD_CQR_QUEUED for 2) and 3).
785 dasd_timeout_device(unsigned long ptr)
788 struct dasd_device *device;
790 device = (struct dasd_device *) ptr;
791 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
792 /* re-activate request queue */
793 device->stopped &= ~DASD_STOPPED_PENDING;
794 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
795 dasd_schedule_bh(device);
799 * Setup timeout for a device in jiffies.
802 dasd_set_timer(struct dasd_device *device, int expires)
805 if (timer_pending(&device->timer))
806 del_timer(&device->timer);
809 if (timer_pending(&device->timer)) {
810 if (mod_timer(&device->timer, jiffies + expires))
813 device->timer.function = dasd_timeout_device;
814 device->timer.data = (unsigned long) device;
815 device->timer.expires = jiffies + expires;
816 add_timer(&device->timer);
820 * Clear timeout for a device.
823 dasd_clear_timer(struct dasd_device *device)
825 if (timer_pending(&device->timer))
826 del_timer(&device->timer);
830 * Handles the state change pending interrupt.
833 do_state_change_pending(void *data)
836 struct work_struct work;
837 struct dasd_device *device;
839 struct dasd_device *device;
840 struct dasd_ccw_req *cqr;
841 struct list_head *l, *n;
846 DBF_EVENT(DBF_NOTICE, "State change Interrupt for bus_id %s",
847 device->cdev->dev.bus_id);
848 device->stopped &= ~DASD_STOPPED_PENDING;
850 /* restart all 'running' IO on queue */
851 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
852 list_for_each_safe(l, n, &device->ccw_queue) {
853 cqr = list_entry(l, struct dasd_ccw_req, list);
854 if (cqr->status == DASD_CQR_IN_IO)
855 cqr->status = DASD_CQR_QUEUED;
857 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
858 dasd_set_timer (device, 0);
859 dasd_schedule_bh(device);
860 dasd_put_device(device);
865 dasd_handle_killed_request(struct ccw_device *cdev, unsigned long intparm)
867 struct dasd_ccw_req *cqr;
868 struct dasd_device *device;
870 cqr = (struct dasd_ccw_req *) intparm;
871 if (cqr->status != DASD_CQR_IN_IO) {
873 "invalid status in handle_killed_request: "
874 "bus_id %s, status %02x",
875 cdev->dev.bus_id, cqr->status);
879 device = (struct dasd_device *) cqr->device;
880 if (device == NULL ||
881 device != dasd_device_from_cdev(cdev) ||
882 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
883 MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s",
888 /* Schedule request to be retried. */
889 cqr->status = DASD_CQR_QUEUED;
891 dasd_clear_timer(device);
892 dasd_schedule_bh(device);
893 dasd_put_device(device);
897 dasd_handle_state_change_pending(struct dasd_device *device)
900 struct work_struct work;
901 struct dasd_device *device;
904 p = kmalloc(sizeof(*p), GFP_ATOMIC);
906 /* No memory, let the timeout do the reactivation. */
908 INIT_WORK(&p->work, (void *) do_state_change_pending, p);
910 dasd_get_device(device);
911 schedule_work(&p->work);
915 * Interrupt handler for "normal" ssch-io based dasd devices.
918 dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
921 struct dasd_ccw_req *cqr, *next;
922 struct dasd_device *device;
923 unsigned long long now;
929 switch (PTR_ERR(irb)) {
931 dasd_handle_killed_request(cdev, intparm);
934 printk(KERN_WARNING"%s(%s): request timed out\n",
935 __FUNCTION__, cdev->dev.bus_id);
936 //FIXME - dasd uses own timeout interface...
939 printk(KERN_WARNING"%s(%s): unknown error %ld\n",
940 __FUNCTION__, cdev->dev.bus_id, PTR_ERR(irb));
947 DBF_EVENT(DBF_DEBUG, "Interrupt: stat %02x, bus_id %s",
948 irb->scsw.dstat, cdev->dev.bus_id);
950 /* first of all check for state change pending interrupt */
951 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
952 if ((irb->scsw.dstat & mask) == mask) {
953 device = dasd_device_from_cdev(cdev);
954 if (!IS_ERR(device)) {
955 dasd_handle_state_change_pending(device);
956 dasd_put_device(device);
961 cqr = (struct dasd_ccw_req *) intparm;
963 * check status - the request might have been killed
964 * because of dyn detach
966 if (cqr->status != DASD_CQR_IN_IO) {
968 "invalid status: bus_id %s, status %02x",
969 cdev->dev.bus_id, cqr->status);
973 device = (struct dasd_device *) cqr->device;
974 if (device == NULL ||
975 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
976 MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s",
981 DBF_DEV_EVENT(DBF_DEBUG, device, "Int: CS/DS 0x%04x",
982 ((irb->scsw.cstat << 8) | irb->scsw.dstat));
984 /* Find out the appropriate era_action. */
985 if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC)
986 era = dasd_era_fatal;
987 else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
988 irb->scsw.cstat == 0 &&
989 !irb->esw.esw0.erw.cons)
991 else if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags))
992 era = dasd_era_fatal; /* don't recover this request */
993 else if (irb->esw.esw0.erw.cons)
994 era = device->discipline->examine_error(cqr, irb);
996 era = dasd_era_recover;
998 DBF_DEV_EVENT(DBF_DEBUG, device, "era_code %d", era);
1000 if (era == dasd_era_none) {
1001 cqr->status = DASD_CQR_DONE;
1003 /* Start first request on queue if possible -> fast_io. */
1004 if (cqr->list.next != &device->ccw_queue) {
1005 next = list_entry(cqr->list.next,
1006 struct dasd_ccw_req, list);
1007 if ((next->status == DASD_CQR_QUEUED) &&
1008 (!device->stopped)) {
1009 if (device->discipline->start_IO(next) == 0)
1010 expires = next->expires;
1012 DEV_MESSAGE(KERN_DEBUG, device, "%s",
1013 "Interrupt fastpath "
1017 } else { /* error */
1018 if (cqr->dstat == NULL)
1019 cqr->dstat = kmalloc(sizeof(struct irb), GFP_ATOMIC);
1021 memcpy(cqr->dstat, irb, sizeof (struct irb));
1023 DEV_MESSAGE(KERN_ERR, device, "%s",
1024 "no memory for dstat...ignoring");
1026 /* dump sense data */
1027 dasd_log_sense(cqr, irb);
1030 case dasd_era_fatal:
1031 cqr->status = DASD_CQR_FAILED;
1034 case dasd_era_recover:
1035 cqr->status = DASD_CQR_ERROR;
1042 dasd_set_timer(device, expires);
1044 dasd_clear_timer(device);
1045 dasd_schedule_bh(device);
1049 * posts the buffer_cache about a finalized request
1052 dasd_end_request(struct request *req, int uptodate)
1054 if (end_that_request_first(req, uptodate, req->hard_nr_sectors))
1056 add_disk_randomness(req->rq_disk);
1057 end_that_request_last(req);
1061 * Process finished error recovery ccw.
1064 __dasd_process_erp(struct dasd_device *device, struct dasd_ccw_req *cqr)
1066 dasd_erp_fn_t erp_fn;
1068 if (cqr->status == DASD_CQR_DONE)
1069 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
1071 DEV_MESSAGE(KERN_ERR, device, "%s", "ERP unsuccessful");
1072 erp_fn = device->discipline->erp_postaction(cqr);
1077 * Process ccw request queue.
1080 __dasd_process_ccw_queue(struct dasd_device * device,
1081 struct list_head *final_queue)
1083 struct list_head *l, *n;
1084 struct dasd_ccw_req *cqr;
1085 dasd_erp_fn_t erp_fn;
1088 /* Process request with final status. */
1089 list_for_each_safe(l, n, &device->ccw_queue) {
1090 cqr = list_entry(l, struct dasd_ccw_req, list);
1091 /* Stop list processing at the first non-final request. */
1092 if (cqr->status != DASD_CQR_DONE &&
1093 cqr->status != DASD_CQR_FAILED &&
1094 cqr->status != DASD_CQR_ERROR)
1096 /* Process requests with DASD_CQR_ERROR */
1097 if (cqr->status == DASD_CQR_ERROR) {
1099 if (cqr->dstat->scsw.fctl & SCSW_FCTL_HALT_FUNC) {
1100 cqr->status = DASD_CQR_FAILED;
1101 cqr->stopclk = get_clock();
1103 if (cqr->dstat->esw.esw0.erw.cons) {
1104 erp_fn = device->discipline->erp_action(cqr);
1107 dasd_default_erp_action(cqr);
1111 /* Process finished ERP request. */
1113 __dasd_process_erp(device, cqr);
1117 /* Rechain finished requests to final queue */
1118 cqr->endclk = get_clock();
1119 list_move_tail(&cqr->list, final_queue);
1124 dasd_end_request_cb(struct dasd_ccw_req * cqr, void *data)
1126 struct request *req;
1128 req = (struct request *) data;
1129 dasd_profile_end(cqr->device, cqr, req);
1130 spin_lock_irq(&cqr->device->request_queue_lock);
1131 dasd_end_request(req, (cqr->status == DASD_CQR_DONE));
1132 spin_unlock_irq(&cqr->device->request_queue_lock);
1133 dasd_sfree_request(cqr, cqr->device);
1138 * Fetch requests from the block device queue.
1141 __dasd_process_blk_queue(struct dasd_device * device)
1143 request_queue_t *queue;
1144 struct request *req;
1145 struct dasd_ccw_req *cqr;
1148 queue = device->request_queue;
1149 /* No queue ? Then there is nothing to do. */
1154 * We requeue request from the block device queue to the ccw
1155 * queue only in two states. In state DASD_STATE_READY the
1156 * partition detection is done and we need to requeue requests
1157 * for that. State DASD_STATE_ONLINE is normal block device
1160 if (device->state != DASD_STATE_READY &&
1161 device->state != DASD_STATE_ONLINE)
1164 /* Now we try to fetch requests from the request queue */
1165 list_for_each_entry(cqr, &device->ccw_queue, list)
1166 if (cqr->status == DASD_CQR_QUEUED)
1168 while (!blk_queue_plugged(queue) &&
1169 elv_next_request(queue) &&
1170 nr_queued < DASD_CHANQ_MAX_SIZE) {
1171 req = elv_next_request(queue);
1172 if (test_bit(DASD_FLAG_RO, &device->flags) &&
1173 rq_data_dir(req) == WRITE) {
1175 "(%s) Rejecting write request %p",
1176 device->cdev->dev.bus_id,
1178 blkdev_dequeue_request(req);
1179 dasd_end_request(req, 0);
1182 if (device->stopped & DASD_STOPPED_DC_EIO) {
1183 blkdev_dequeue_request(req);
1184 dasd_end_request(req, 0);
1187 cqr = device->discipline->build_cp(device, req);
1189 if (PTR_ERR(cqr) == -ENOMEM)
1190 break; /* terminate request queue loop */
1192 "(%s) CCW creation failed on request %p",
1193 device->cdev->dev.bus_id,
1195 blkdev_dequeue_request(req);
1196 dasd_end_request(req, 0);
1199 cqr->callback = dasd_end_request_cb;
1200 cqr->callback_data = (void *) req;
1201 cqr->status = DASD_CQR_QUEUED;
1202 blkdev_dequeue_request(req);
1203 list_add_tail(&cqr->list, &device->ccw_queue);
1204 dasd_profile_start(device, cqr, req);
1210 * Take a look at the first request on the ccw queue and check
1211 * if it reached its expire time. If so, terminate the IO.
1214 __dasd_check_expire(struct dasd_device * device)
1216 struct dasd_ccw_req *cqr;
1218 if (list_empty(&device->ccw_queue))
1220 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list);
1221 if (cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) {
1222 if (time_after_eq(jiffies, cqr->expires + cqr->starttime)) {
1223 if (device->discipline->term_IO(cqr) != 0)
1224 /* Hmpf, try again in 1/100 sec */
1225 dasd_set_timer(device, 1);
1231 * Take a look at the first request on the ccw queue and check
1232 * if it needs to be started.
1235 __dasd_start_head(struct dasd_device * device)
1237 struct dasd_ccw_req *cqr;
1240 if (list_empty(&device->ccw_queue))
1242 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list);
1243 if ((cqr->status == DASD_CQR_QUEUED) &&
1244 (!device->stopped)) {
1245 /* try to start the first I/O that can be started */
1246 rc = device->discipline->start_IO(cqr);
1248 dasd_set_timer(device, cqr->expires);
1249 else if (rc == -EBUSY)
1250 /* Hmpf, try again in 1/100 sec */
1251 dasd_set_timer(device, 1);
1256 * Remove requests from the ccw queue.
1259 dasd_flush_ccw_queue(struct dasd_device * device, int all)
1261 struct list_head flush_queue;
1262 struct list_head *l, *n;
1263 struct dasd_ccw_req *cqr;
1265 INIT_LIST_HEAD(&flush_queue);
1266 spin_lock_irq(get_ccwdev_lock(device->cdev));
1267 list_for_each_safe(l, n, &device->ccw_queue) {
1268 cqr = list_entry(l, struct dasd_ccw_req, list);
1269 /* Flush all request or only block device requests? */
1270 if (all == 0 && cqr->callback == dasd_end_request_cb)
1272 if (cqr->status == DASD_CQR_IN_IO)
1273 device->discipline->term_IO(cqr);
1274 if (cqr->status != DASD_CQR_DONE ||
1275 cqr->status != DASD_CQR_FAILED) {
1276 cqr->status = DASD_CQR_FAILED;
1277 cqr->stopclk = get_clock();
1279 /* Process finished ERP request. */
1281 __dasd_process_erp(device, cqr);
1284 /* Rechain request on device request queue */
1285 cqr->endclk = get_clock();
1286 list_move_tail(&cqr->list, &flush_queue);
1288 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1289 /* Now call the callback function of flushed requests */
1290 list_for_each_safe(l, n, &flush_queue) {
1291 cqr = list_entry(l, struct dasd_ccw_req, list);
1292 if (cqr->callback != NULL)
1293 (cqr->callback)(cqr, cqr->callback_data);
1298 * Acquire the device lock and process queues for the device.
1301 dasd_tasklet(struct dasd_device * device)
1303 struct list_head final_queue;
1304 struct list_head *l, *n;
1305 struct dasd_ccw_req *cqr;
1307 atomic_set (&device->tasklet_scheduled, 0);
1308 INIT_LIST_HEAD(&final_queue);
1309 spin_lock_irq(get_ccwdev_lock(device->cdev));
1310 /* Check expire time of first request on the ccw queue. */
1311 __dasd_check_expire(device);
1312 /* Finish off requests on ccw queue */
1313 __dasd_process_ccw_queue(device, &final_queue);
1314 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1315 /* Now call the callback function of requests with final status */
1316 list_for_each_safe(l, n, &final_queue) {
1317 cqr = list_entry(l, struct dasd_ccw_req, list);
1318 list_del(&cqr->list);
1319 if (cqr->callback != NULL)
1320 (cqr->callback)(cqr, cqr->callback_data);
1322 spin_lock_irq(&device->request_queue_lock);
1323 spin_lock(get_ccwdev_lock(device->cdev));
1324 /* Get new request from the block device request queue */
1325 __dasd_process_blk_queue(device);
1326 /* Now check if the head of the ccw queue needs to be started. */
1327 __dasd_start_head(device);
1328 spin_unlock(get_ccwdev_lock(device->cdev));
1329 spin_unlock_irq(&device->request_queue_lock);
1330 dasd_put_device(device);
1334 * Schedules a call to dasd_tasklet over the device tasklet.
1337 dasd_schedule_bh(struct dasd_device * device)
1339 /* Protect against rescheduling. */
1340 if (atomic_compare_and_swap (0, 1, &device->tasklet_scheduled))
1342 dasd_get_device(device);
1343 tasklet_hi_schedule(&device->tasklet);
1347 * Queue a request to the head of the ccw_queue. Start the I/O if
1351 dasd_add_request_head(struct dasd_ccw_req *req)
1353 struct dasd_device *device;
1354 unsigned long flags;
1356 device = req->device;
1357 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1358 req->status = DASD_CQR_QUEUED;
1359 req->device = device;
1360 list_add(&req->list, &device->ccw_queue);
1361 /* let the bh start the request to keep them in order */
1362 dasd_schedule_bh(device);
1363 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1367 * Queue a request to the tail of the ccw_queue. Start the I/O if
1371 dasd_add_request_tail(struct dasd_ccw_req *req)
1373 struct dasd_device *device;
1374 unsigned long flags;
1376 device = req->device;
1377 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1378 req->status = DASD_CQR_QUEUED;
1379 req->device = device;
1380 list_add_tail(&req->list, &device->ccw_queue);
1381 /* let the bh start the request to keep them in order */
1382 dasd_schedule_bh(device);
1383 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1390 dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
1392 wake_up((wait_queue_head_t *) data);
1396 _wait_for_wakeup(struct dasd_ccw_req *cqr)
1398 struct dasd_device *device;
1401 device = cqr->device;
1402 spin_lock_irq(get_ccwdev_lock(device->cdev));
1403 rc = cqr->status == DASD_CQR_DONE || cqr->status == DASD_CQR_FAILED;
1404 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1409 * Attempts to start a special ccw queue and waits for its completion.
1412 dasd_sleep_on(struct dasd_ccw_req * cqr)
1414 wait_queue_head_t wait_q;
1415 struct dasd_device *device;
1418 device = cqr->device;
1419 spin_lock_irq(get_ccwdev_lock(device->cdev));
1421 init_waitqueue_head (&wait_q);
1422 cqr->callback = dasd_wakeup_cb;
1423 cqr->callback_data = (void *) &wait_q;
1424 cqr->status = DASD_CQR_QUEUED;
1425 list_add_tail(&cqr->list, &device->ccw_queue);
1427 /* let the bh start the request to keep them in order */
1428 dasd_schedule_bh(device);
1430 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1432 wait_event(wait_q, _wait_for_wakeup(cqr));
1434 /* Request status is either done or failed. */
1435 rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0;
1440 * Attempts to start a special ccw queue and wait interruptible
1441 * for its completion.
1444 dasd_sleep_on_interruptible(struct dasd_ccw_req * cqr)
1446 wait_queue_head_t wait_q;
1447 struct dasd_device *device;
1450 device = cqr->device;
1451 spin_lock_irq(get_ccwdev_lock(device->cdev));
1453 init_waitqueue_head (&wait_q);
1454 cqr->callback = dasd_wakeup_cb;
1455 cqr->callback_data = (void *) &wait_q;
1456 cqr->status = DASD_CQR_QUEUED;
1457 list_add_tail(&cqr->list, &device->ccw_queue);
1459 /* let the bh start the request to keep them in order */
1460 dasd_schedule_bh(device);
1461 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1465 rc = wait_event_interruptible(wait_q, _wait_for_wakeup(cqr));
1466 if (rc != -ERESTARTSYS) {
1467 /* Request status is either done or failed. */
1468 rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0;
1471 spin_lock_irq(get_ccwdev_lock(device->cdev));
1472 if (cqr->status == DASD_CQR_IN_IO &&
1473 device->discipline->term_IO(cqr) == 0) {
1474 list_del(&cqr->list);
1477 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1483 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
1484 * for eckd devices) the currently running request has to be terminated
1485 * and be put back to status queued, before the special request is added
1486 * to the head of the queue. Then the special request is waited on normally.
1489 _dasd_term_running_cqr(struct dasd_device *device)
1491 struct dasd_ccw_req *cqr;
1494 if (list_empty(&device->ccw_queue))
1496 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list);
1497 rc = device->discipline->term_IO(cqr);
1499 /* termination successful */
1500 cqr->status = DASD_CQR_QUEUED;
1501 cqr->startclk = cqr->stopclk = 0;
1508 dasd_sleep_on_immediatly(struct dasd_ccw_req * cqr)
1510 wait_queue_head_t wait_q;
1511 struct dasd_device *device;
1514 device = cqr->device;
1515 spin_lock_irq(get_ccwdev_lock(device->cdev));
1516 rc = _dasd_term_running_cqr(device);
1518 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1522 init_waitqueue_head (&wait_q);
1523 cqr->callback = dasd_wakeup_cb;
1524 cqr->callback_data = (void *) &wait_q;
1525 cqr->status = DASD_CQR_QUEUED;
1526 list_add(&cqr->list, &device->ccw_queue);
1528 /* let the bh start the request to keep them in order */
1529 dasd_schedule_bh(device);
1531 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1533 wait_event(wait_q, _wait_for_wakeup(cqr));
1535 /* Request status is either done or failed. */
1536 rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0;
1541 * Cancels a request that was started with dasd_sleep_on_req.
1542 * This is useful to timeout requests. The request will be
1543 * terminated if it is currently in i/o.
1544 * Returns 1 if the request has been terminated.
1547 dasd_cancel_req(struct dasd_ccw_req *cqr)
1549 struct dasd_device *device = cqr->device;
1550 unsigned long flags;
1554 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1555 switch (cqr->status) {
1556 case DASD_CQR_QUEUED:
1557 /* request was not started - just set to failed */
1558 cqr->status = DASD_CQR_FAILED;
1560 case DASD_CQR_IN_IO:
1561 /* request in IO - terminate IO and release again */
1562 if (device->discipline->term_IO(cqr) != 0)
1563 /* what to do if unable to terminate ??????
1565 cqr->status = DASD_CQR_FAILED;
1566 cqr->stopclk = get_clock();
1570 case DASD_CQR_FAILED:
1571 /* already finished - do nothing */
1574 DEV_MESSAGE(KERN_ALERT, device,
1575 "invalid status %02x in request",
1580 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1581 dasd_schedule_bh(device);
1586 * SECTION: Block device operations (request queue, partitions, open, release).
1590 * Dasd request queue function. Called from ll_rw_blk.c
1593 do_dasd_request(request_queue_t * queue)
1595 struct dasd_device *device;
1597 device = (struct dasd_device *) queue->queuedata;
1598 spin_lock(get_ccwdev_lock(device->cdev));
1599 /* Get new request from the block device request queue */
1600 __dasd_process_blk_queue(device);
1601 /* Now check if the head of the ccw queue needs to be started. */
1602 __dasd_start_head(device);
1603 spin_unlock(get_ccwdev_lock(device->cdev));
1607 * Allocate and initialize request queue.
1610 dasd_alloc_queue(struct dasd_device * device)
1612 device->request_queue = blk_init_queue(do_dasd_request,
1613 &device->request_queue_lock);
1614 if (device->request_queue == NULL)
1617 device->request_queue->queuedata = device;
1619 elevator_exit(device->request_queue);
1620 rc = elevator_init(device->request_queue, &elevator_noop);
1622 blk_cleanup_queue(device->request_queue);
1630 * Allocate and initialize request queue.
1633 dasd_setup_queue(struct dasd_device * device)
1637 blk_queue_hardsect_size(device->request_queue, device->bp_block);
1638 max = device->discipline->max_blocks << device->s2b_shift;
1639 blk_queue_max_sectors(device->request_queue, max);
1640 blk_queue_max_phys_segments(device->request_queue, -1L);
1641 blk_queue_max_hw_segments(device->request_queue, -1L);
1642 blk_queue_max_segment_size(device->request_queue, -1L);
1643 blk_queue_segment_boundary(device->request_queue, -1L);
1647 * Deactivate and free request queue.
1650 dasd_free_queue(struct dasd_device * device)
1652 if (device->request_queue) {
1653 blk_cleanup_queue(device->request_queue);
1654 device->request_queue = NULL;
1659 * Flush request on the request queue.
1662 dasd_flush_request_queue(struct dasd_device * device)
1664 struct request *req;
1666 if (!device->request_queue)
1669 spin_lock_irq(&device->request_queue_lock);
1670 while (!list_empty(&device->request_queue->queue_head)) {
1671 req = elv_next_request(device->request_queue);
1674 dasd_end_request(req, 0);
1675 blkdev_dequeue_request(req);
1677 spin_unlock_irq(&device->request_queue_lock);
1681 dasd_open(struct inode *inp, struct file *filp)
1683 struct gendisk *disk = inp->i_bdev->bd_disk;
1684 struct dasd_device *device = disk->private_data;
1687 atomic_inc(&device->open_count);
1688 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
1693 if (!try_module_get(device->discipline->owner)) {
1698 if (dasd_probeonly) {
1700 "No access to device %s due to probeonly mode",
1706 if (device->state < DASD_STATE_BASIC) {
1707 DBF_DEV_EVENT(DBF_ERR, device, " %s",
1708 " Cannot open unrecognized device");
1716 module_put(device->discipline->owner);
1718 atomic_dec(&device->open_count);
1723 dasd_release(struct inode *inp, struct file *filp)
1725 struct gendisk *disk = inp->i_bdev->bd_disk;
1726 struct dasd_device *device = disk->private_data;
1728 atomic_dec(&device->open_count);
1729 module_put(device->discipline->owner);
1733 struct block_device_operations
1734 dasd_device_operations = {
1735 .owner = THIS_MODULE,
1737 .release = dasd_release,
1738 .ioctl = dasd_ioctl,
1745 #ifdef CONFIG_PROC_FS
1749 dasd_gendisk_exit();
1751 devfs_remove("dasd");
1752 if (dasd_debug_area != NULL) {
1753 debug_unregister(dasd_debug_area);
1754 dasd_debug_area = NULL;
1759 * SECTION: common functions for ccw_driver use
1762 /* initial attempt at a probe function. this can be simplified once
1763 * the other detection code is gone */
1765 dasd_generic_probe (struct ccw_device *cdev,
1766 struct dasd_discipline *discipline)
1770 ret = dasd_add_sysfs_files(cdev);
1773 "dasd_generic_probe: could not add sysfs entries "
1774 "for %s\n", cdev->dev.bus_id);
1777 cdev->handler = &dasd_int_handler;
1782 /* this will one day be called from a global not_oper handler.
1783 * It is also used by driver_unregister during module unload */
1785 dasd_generic_remove (struct ccw_device *cdev)
1787 struct dasd_device *device;
1789 dasd_remove_sysfs_files(cdev);
1790 device = dasd_device_from_cdev(cdev);
1793 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
1794 /* Already doing offline processing */
1795 dasd_put_device(device);
1799 * This device is removed unconditionally. Set offline
1800 * flag to prevent dasd_open from opening it while it is
1801 * no quite down yet.
1803 dasd_set_target_state(device, DASD_STATE_NEW);
1804 /* dasd_delete_device destroys the device reference. */
1805 dasd_delete_device(device);
1808 /* activate a device. This is called from dasd_{eckd,fba}_probe() when either
1809 * the device is detected for the first time and is supposed to be used
1810 * or the user has started activation through sysfs */
1812 dasd_generic_set_online (struct ccw_device *cdev,
1813 struct dasd_discipline *discipline)
1816 struct dasd_device *device;
1819 device = dasd_create_device(cdev);
1821 return PTR_ERR(device);
1823 if (test_bit(DASD_FLAG_USE_DIAG, &device->flags)) {
1824 if (!dasd_diag_discipline_pointer) {
1825 printk (KERN_WARNING
1826 "dasd_generic couldn't online device %s "
1827 "- discipline DIAG not available\n",
1829 dasd_delete_device(device);
1832 discipline = dasd_diag_discipline_pointer;
1834 device->discipline = discipline;
1836 rc = discipline->check_device(device);
1838 printk (KERN_WARNING
1839 "dasd_generic couldn't online device %s "
1840 "with discipline %s\n",
1841 cdev->dev.bus_id, discipline->name);
1842 dasd_delete_device(device);
1846 dasd_set_target_state(device, DASD_STATE_ONLINE);
1847 if (device->state <= DASD_STATE_KNOWN) {
1848 printk (KERN_WARNING
1849 "dasd_generic discipline not found for %s\n",
1852 dasd_set_target_state(device, DASD_STATE_NEW);
1853 dasd_delete_device(device);
1855 pr_debug("dasd_generic device %s found\n",
1858 /* FIXME: we have to wait for the root device but we don't want
1859 * to wait for each single device but for all at once. */
1860 wait_event(dasd_init_waitq, _wait_for_device(device));
1862 dasd_put_device(device);
1868 dasd_generic_set_offline (struct ccw_device *cdev)
1870 struct dasd_device *device;
1873 device = dasd_device_from_cdev(cdev);
1875 return PTR_ERR(device);
1876 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
1877 /* Already doing offline processing */
1878 dasd_put_device(device);
1882 * We must make sure that this device is currently not in use.
1883 * The open_count is increased for every opener, that includes
1884 * the blkdev_get in dasd_scan_partitions. We are only interested
1885 * in the other openers.
1887 max_count = device->bdev ? 0 : -1;
1888 if (atomic_read(&device->open_count) > max_count) {
1889 printk (KERN_WARNING "Can't offline dasd device with open"
1891 atomic_read(&device->open_count));
1892 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
1893 dasd_put_device(device);
1896 dasd_set_target_state(device, DASD_STATE_NEW);
1897 /* dasd_delete_device destroys the device reference. */
1898 dasd_delete_device(device);
1904 dasd_generic_notify(struct ccw_device *cdev, int event)
1906 struct dasd_device *device;
1907 struct dasd_ccw_req *cqr;
1908 unsigned long flags;
1911 device = dasd_device_from_cdev(cdev);
1914 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1919 if (device->state < DASD_STATE_BASIC)
1921 /* Device is active. We want to keep it. */
1922 if (test_bit(DASD_FLAG_DSC_ERROR, &device->flags)) {
1923 list_for_each_entry(cqr, &device->ccw_queue, list)
1924 if (cqr->status == DASD_CQR_IN_IO)
1925 cqr->status = DASD_CQR_FAILED;
1926 device->stopped |= DASD_STOPPED_DC_EIO;
1927 dasd_schedule_bh(device);
1929 list_for_each_entry(cqr, &device->ccw_queue, list)
1930 if (cqr->status == DASD_CQR_IN_IO)
1931 cqr->status = DASD_CQR_QUEUED;
1932 device->stopped |= DASD_STOPPED_DC_WAIT;
1933 dasd_set_timer(device, 0);
1938 /* FIXME: add a sanity check. */
1939 device->stopped &= ~(DASD_STOPPED_DC_WAIT|DASD_STOPPED_DC_EIO);
1940 dasd_schedule_bh(device);
1944 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1945 dasd_put_device(device);
1950 * Automatically online either all dasd devices (dasd_autodetect) or
1951 * all devices specified with dasd= parameters.
1954 dasd_generic_auto_online (struct ccw_driver *dasd_discipline_driver)
1956 struct device_driver *drv;
1957 struct device *d, *dev;
1958 struct ccw_device *cdev;
1960 drv = get_driver(&dasd_discipline_driver->driver);
1961 down_read(&drv->bus->subsys.rwsem);
1963 list_for_each_entry(d, &drv->devices, driver_list) {
1964 dev = get_device(d);
1967 cdev = to_ccwdev(dev);
1968 if (dasd_autodetect || dasd_busid_known(cdev->dev.bus_id) == 0)
1969 ccw_device_set_online(cdev);
1972 up_read(&drv->bus->subsys.rwsem);
1981 init_waitqueue_head(&dasd_init_waitq);
1983 /* register 'common' DASD debug area, used faor all DBF_XXX calls */
1984 dasd_debug_area = debug_register("dasd", 0, 2, 8 * sizeof (long));
1985 if (dasd_debug_area == NULL) {
1989 debug_register_view(dasd_debug_area, &debug_hex_ascii_view);
1990 debug_set_level(dasd_debug_area, DBF_ERR);
1992 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
1994 dasd_diag_discipline_pointer = NULL;
1996 rc = devfs_mk_dir("dasd");
1999 rc = dasd_devmap_init();
2002 rc = dasd_gendisk_init();
2008 rc = dasd_ioctl_init();
2011 #ifdef CONFIG_PROC_FS
2012 rc = dasd_proc_init();
2019 MESSAGE(KERN_INFO, "%s", "initialization not performed due to errors");
2024 module_init(dasd_init);
2025 module_exit(dasd_exit);
2027 EXPORT_SYMBOL(dasd_debug_area);
2028 EXPORT_SYMBOL(dasd_diag_discipline_pointer);
2030 EXPORT_SYMBOL(dasd_add_request_head);
2031 EXPORT_SYMBOL(dasd_add_request_tail);
2032 EXPORT_SYMBOL(dasd_cancel_req);
2033 EXPORT_SYMBOL(dasd_clear_timer);
2034 EXPORT_SYMBOL(dasd_enable_device);
2035 EXPORT_SYMBOL(dasd_int_handler);
2036 EXPORT_SYMBOL(dasd_kfree_request);
2037 EXPORT_SYMBOL(dasd_kick_device);
2038 EXPORT_SYMBOL(dasd_kmalloc_request);
2039 EXPORT_SYMBOL(dasd_schedule_bh);
2040 EXPORT_SYMBOL(dasd_set_target_state);
2041 EXPORT_SYMBOL(dasd_set_timer);
2042 EXPORT_SYMBOL(dasd_sfree_request);
2043 EXPORT_SYMBOL(dasd_sleep_on);
2044 EXPORT_SYMBOL(dasd_sleep_on_immediatly);
2045 EXPORT_SYMBOL(dasd_sleep_on_interruptible);
2046 EXPORT_SYMBOL(dasd_smalloc_request);
2047 EXPORT_SYMBOL(dasd_start_IO);
2048 EXPORT_SYMBOL(dasd_term_IO);
2050 EXPORT_SYMBOL_GPL(dasd_generic_probe);
2051 EXPORT_SYMBOL_GPL(dasd_generic_remove);
2052 EXPORT_SYMBOL_GPL(dasd_generic_notify);
2053 EXPORT_SYMBOL_GPL(dasd_generic_set_online);
2054 EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
2055 EXPORT_SYMBOL_GPL(dasd_generic_auto_online);
2058 * Overrides for Emacs so that we follow Linus's tabbing style.
2059 * Emacs will notice this stuff at the end of the file and automatically
2060 * adjust the settings for this buffer only. This must remain at the end
2062 * ---------------------------------------------------------------------------
2065 * c-brace-imaginary-offset: 0
2066 * c-brace-offset: -4
2067 * c-argdecl-indent: 4
2068 * c-label-offset: -4
2069 * c-continued-statement-offset: 4
2070 * c-continued-brace-offset: 0
2071 * indent-tabs-mode: 1