2 * File...........: linux/drivers/s390/block/dasd.c
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * Copyright IBM Corp. 1999, 2009
11 #define KMSG_COMPONENT "dasd"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14 #include <linux/kmod.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/ctype.h>
18 #include <linux/major.h>
19 #include <linux/slab.h>
20 #include <linux/buffer_head.h>
21 #include <linux/hdreg.h>
22 #include <linux/async.h>
24 #include <asm/ccwdev.h>
25 #include <asm/ebcdic.h>
26 #include <asm/idals.h>
27 #include <asm/todclk.h>
31 #define PRINTK_HEADER "dasd:"
35 * SECTION: Constant definitions to be used within this file
37 #define DASD_CHANQ_MAX_SIZE 4
40 * SECTION: exported variables of dasd.c
42 debug_info_t
*dasd_debug_area
;
43 struct dasd_discipline
*dasd_diag_discipline_pointer
;
44 void dasd_int_handler(struct ccw_device
*, unsigned long, struct irb
*);
46 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
47 MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
48 " Copyright 2000 IBM Corporation");
49 MODULE_SUPPORTED_DEVICE("dasd");
50 MODULE_LICENSE("GPL");
53 * SECTION: prototypes for static functions of dasd.c
55 static int dasd_alloc_queue(struct dasd_block
*);
56 static void dasd_setup_queue(struct dasd_block
*);
57 static void dasd_free_queue(struct dasd_block
*);
58 static void dasd_flush_request_queue(struct dasd_block
*);
59 static int dasd_flush_block_queue(struct dasd_block
*);
60 static void dasd_device_tasklet(struct dasd_device
*);
61 static void dasd_block_tasklet(struct dasd_block
*);
62 static void do_kick_device(struct work_struct
*);
63 static void do_restore_device(struct work_struct
*);
64 static void dasd_return_cqr_cb(struct dasd_ccw_req
*, void *);
65 static void dasd_device_timeout(unsigned long);
66 static void dasd_block_timeout(unsigned long);
69 * SECTION: Operations on the device structure.
71 static wait_queue_head_t dasd_init_waitq
;
72 static wait_queue_head_t dasd_flush_wq
;
73 static wait_queue_head_t generic_waitq
;
76 * Allocate memory for a new device structure.
78 struct dasd_device
*dasd_alloc_device(void)
80 struct dasd_device
*device
;
82 device
= kzalloc(sizeof(struct dasd_device
), GFP_ATOMIC
);
84 return ERR_PTR(-ENOMEM
);
86 /* Get two pages for normal block device operations. */
87 device
->ccw_mem
= (void *) __get_free_pages(GFP_ATOMIC
| GFP_DMA
, 1);
88 if (!device
->ccw_mem
) {
90 return ERR_PTR(-ENOMEM
);
92 /* Get one page for error recovery. */
93 device
->erp_mem
= (void *) get_zeroed_page(GFP_ATOMIC
| GFP_DMA
);
94 if (!device
->erp_mem
) {
95 free_pages((unsigned long) device
->ccw_mem
, 1);
97 return ERR_PTR(-ENOMEM
);
100 dasd_init_chunklist(&device
->ccw_chunks
, device
->ccw_mem
, PAGE_SIZE
*2);
101 dasd_init_chunklist(&device
->erp_chunks
, device
->erp_mem
, PAGE_SIZE
);
102 spin_lock_init(&device
->mem_lock
);
103 atomic_set(&device
->tasklet_scheduled
, 0);
104 tasklet_init(&device
->tasklet
,
105 (void (*)(unsigned long)) dasd_device_tasklet
,
106 (unsigned long) device
);
107 INIT_LIST_HEAD(&device
->ccw_queue
);
108 init_timer(&device
->timer
);
109 device
->timer
.function
= dasd_device_timeout
;
110 device
->timer
.data
= (unsigned long) device
;
111 INIT_WORK(&device
->kick_work
, do_kick_device
);
112 INIT_WORK(&device
->restore_device
, do_restore_device
);
113 device
->state
= DASD_STATE_NEW
;
114 device
->target
= DASD_STATE_NEW
;
120 * Free memory of a device structure.
122 void dasd_free_device(struct dasd_device
*device
)
124 kfree(device
->private);
125 free_page((unsigned long) device
->erp_mem
);
126 free_pages((unsigned long) device
->ccw_mem
, 1);
131 * Allocate memory for a new device structure.
133 struct dasd_block
*dasd_alloc_block(void)
135 struct dasd_block
*block
;
137 block
= kzalloc(sizeof(*block
), GFP_ATOMIC
);
139 return ERR_PTR(-ENOMEM
);
140 /* open_count = 0 means device online but not in use */
141 atomic_set(&block
->open_count
, -1);
143 spin_lock_init(&block
->request_queue_lock
);
144 atomic_set(&block
->tasklet_scheduled
, 0);
145 tasklet_init(&block
->tasklet
,
146 (void (*)(unsigned long)) dasd_block_tasklet
,
147 (unsigned long) block
);
148 INIT_LIST_HEAD(&block
->ccw_queue
);
149 spin_lock_init(&block
->queue_lock
);
150 init_timer(&block
->timer
);
151 block
->timer
.function
= dasd_block_timeout
;
152 block
->timer
.data
= (unsigned long) block
;
158 * Free memory of a device structure.
160 void dasd_free_block(struct dasd_block
*block
)
166 * Make a new device known to the system.
168 static int dasd_state_new_to_known(struct dasd_device
*device
)
173 * As long as the device is not in state DASD_STATE_NEW we want to
174 * keep the reference count > 0.
176 dasd_get_device(device
);
179 rc
= dasd_alloc_queue(device
->block
);
181 dasd_put_device(device
);
185 device
->state
= DASD_STATE_KNOWN
;
190 * Let the system forget about a device.
192 static int dasd_state_known_to_new(struct dasd_device
*device
)
194 /* Disable extended error reporting for this device. */
195 dasd_eer_disable(device
);
196 /* Forget the discipline information. */
197 if (device
->discipline
) {
198 if (device
->discipline
->uncheck_device
)
199 device
->discipline
->uncheck_device(device
);
200 module_put(device
->discipline
->owner
);
202 device
->discipline
= NULL
;
203 if (device
->base_discipline
)
204 module_put(device
->base_discipline
->owner
);
205 device
->base_discipline
= NULL
;
206 device
->state
= DASD_STATE_NEW
;
209 dasd_free_queue(device
->block
);
211 /* Give up reference we took in dasd_state_new_to_known. */
212 dasd_put_device(device
);
217 * Request the irq line for the device.
219 static int dasd_state_known_to_basic(struct dasd_device
*device
)
223 /* Allocate and register gendisk structure. */
225 rc
= dasd_gendisk_alloc(device
->block
);
229 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
230 device
->debug_area
= debug_register(dev_name(&device
->cdev
->dev
), 4, 1,
232 debug_register_view(device
->debug_area
, &debug_sprintf_view
);
233 debug_set_level(device
->debug_area
, DBF_WARNING
);
234 DBF_DEV_EVENT(DBF_EMERG
, device
, "%s", "debug area created");
236 device
->state
= DASD_STATE_BASIC
;
241 * Release the irq line for the device. Terminate any running i/o.
243 static int dasd_state_basic_to_known(struct dasd_device
*device
)
247 dasd_gendisk_free(device
->block
);
248 dasd_block_clear_timer(device
->block
);
250 rc
= dasd_flush_device_queue(device
);
253 dasd_device_clear_timer(device
);
255 DBF_DEV_EVENT(DBF_EMERG
, device
, "%p debug area deleted", device
);
256 if (device
->debug_area
!= NULL
) {
257 debug_unregister(device
->debug_area
);
258 device
->debug_area
= NULL
;
260 device
->state
= DASD_STATE_KNOWN
;
265 * Do the initial analysis. The do_analysis function may return
266 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
267 * until the discipline decides to continue the startup sequence
268 * by calling the function dasd_change_state. The eckd disciplines
269 * uses this to start a ccw that detects the format. The completion
270 * interrupt for this detection ccw uses the kernel event daemon to
271 * trigger the call to dasd_change_state. All this is done in the
272 * discipline code, see dasd_eckd.c.
273 * After the analysis ccw is done (do_analysis returned 0) the block
275 * In case the analysis returns an error, the device setup is stopped
276 * (a fake disk was already added to allow formatting).
278 static int dasd_state_basic_to_ready(struct dasd_device
*device
)
281 struct dasd_block
*block
;
284 block
= device
->block
;
285 /* make disk known with correct capacity */
287 if (block
->base
->discipline
->do_analysis
!= NULL
)
288 rc
= block
->base
->discipline
->do_analysis(block
);
291 device
->state
= DASD_STATE_UNFMT
;
294 dasd_setup_queue(block
);
295 set_capacity(block
->gdp
,
296 block
->blocks
<< block
->s2b_shift
);
297 device
->state
= DASD_STATE_READY
;
298 rc
= dasd_scan_partitions(block
);
300 device
->state
= DASD_STATE_BASIC
;
302 device
->state
= DASD_STATE_READY
;
308 * Remove device from block device layer. Destroy dirty buffers.
309 * Forget format information. Check if the target level is basic
310 * and if it is create fake disk for formatting.
312 static int dasd_state_ready_to_basic(struct dasd_device
*device
)
316 device
->state
= DASD_STATE_BASIC
;
318 struct dasd_block
*block
= device
->block
;
319 rc
= dasd_flush_block_queue(block
);
321 device
->state
= DASD_STATE_READY
;
324 dasd_destroy_partitions(block
);
325 dasd_flush_request_queue(block
);
328 block
->s2b_shift
= 0;
336 static int dasd_state_unfmt_to_basic(struct dasd_device
*device
)
338 device
->state
= DASD_STATE_BASIC
;
343 * Make the device online and schedule the bottom half to start
344 * the requeueing of requests from the linux request queue to the
348 dasd_state_ready_to_online(struct dasd_device
* device
)
351 struct gendisk
*disk
;
352 struct disk_part_iter piter
;
353 struct hd_struct
*part
;
355 if (device
->discipline
->ready_to_online
) {
356 rc
= device
->discipline
->ready_to_online(device
);
360 device
->state
= DASD_STATE_ONLINE
;
362 dasd_schedule_block_bh(device
->block
);
363 disk
= device
->block
->bdev
->bd_disk
;
364 disk_part_iter_init(&piter
, disk
, DISK_PITER_INCL_PART0
);
365 while ((part
= disk_part_iter_next(&piter
)))
366 kobject_uevent(&part_to_dev(part
)->kobj
, KOBJ_CHANGE
);
367 disk_part_iter_exit(&piter
);
373 * Stop the requeueing of requests again.
375 static int dasd_state_online_to_ready(struct dasd_device
*device
)
378 struct gendisk
*disk
;
379 struct disk_part_iter piter
;
380 struct hd_struct
*part
;
382 if (device
->discipline
->online_to_ready
) {
383 rc
= device
->discipline
->online_to_ready(device
);
387 device
->state
= DASD_STATE_READY
;
389 disk
= device
->block
->bdev
->bd_disk
;
390 disk_part_iter_init(&piter
, disk
, DISK_PITER_INCL_PART0
);
391 while ((part
= disk_part_iter_next(&piter
)))
392 kobject_uevent(&part_to_dev(part
)->kobj
, KOBJ_CHANGE
);
393 disk_part_iter_exit(&piter
);
399 * Device startup state changes.
401 static int dasd_increase_state(struct dasd_device
*device
)
406 if (device
->state
== DASD_STATE_NEW
&&
407 device
->target
>= DASD_STATE_KNOWN
)
408 rc
= dasd_state_new_to_known(device
);
411 device
->state
== DASD_STATE_KNOWN
&&
412 device
->target
>= DASD_STATE_BASIC
)
413 rc
= dasd_state_known_to_basic(device
);
416 device
->state
== DASD_STATE_BASIC
&&
417 device
->target
>= DASD_STATE_READY
)
418 rc
= dasd_state_basic_to_ready(device
);
421 device
->state
== DASD_STATE_UNFMT
&&
422 device
->target
> DASD_STATE_UNFMT
)
426 device
->state
== DASD_STATE_READY
&&
427 device
->target
>= DASD_STATE_ONLINE
)
428 rc
= dasd_state_ready_to_online(device
);
434 * Device shutdown state changes.
436 static int dasd_decrease_state(struct dasd_device
*device
)
441 if (device
->state
== DASD_STATE_ONLINE
&&
442 device
->target
<= DASD_STATE_READY
)
443 rc
= dasd_state_online_to_ready(device
);
446 device
->state
== DASD_STATE_READY
&&
447 device
->target
<= DASD_STATE_BASIC
)
448 rc
= dasd_state_ready_to_basic(device
);
451 device
->state
== DASD_STATE_UNFMT
&&
452 device
->target
<= DASD_STATE_BASIC
)
453 rc
= dasd_state_unfmt_to_basic(device
);
456 device
->state
== DASD_STATE_BASIC
&&
457 device
->target
<= DASD_STATE_KNOWN
)
458 rc
= dasd_state_basic_to_known(device
);
461 device
->state
== DASD_STATE_KNOWN
&&
462 device
->target
<= DASD_STATE_NEW
)
463 rc
= dasd_state_known_to_new(device
);
469 * This is the main startup/shutdown routine.
471 static void dasd_change_state(struct dasd_device
*device
)
475 if (device
->state
== device
->target
)
476 /* Already where we want to go today... */
478 if (device
->state
< device
->target
)
479 rc
= dasd_increase_state(device
);
481 rc
= dasd_decrease_state(device
);
482 if (rc
&& rc
!= -EAGAIN
)
483 device
->target
= device
->state
;
485 if (device
->state
== device
->target
) {
486 wake_up(&dasd_init_waitq
);
487 dasd_put_device(device
);
490 /* let user-space know that the device status changed */
491 kobject_uevent(&device
->cdev
->dev
.kobj
, KOBJ_CHANGE
);
495 * Kick starter for devices that did not complete the startup/shutdown
496 * procedure or were sleeping because of a pending state.
497 * dasd_kick_device will schedule a call do do_kick_device to the kernel
500 static void do_kick_device(struct work_struct
*work
)
502 struct dasd_device
*device
= container_of(work
, struct dasd_device
, kick_work
);
503 dasd_change_state(device
);
504 dasd_schedule_device_bh(device
);
505 dasd_put_device(device
);
508 void dasd_kick_device(struct dasd_device
*device
)
510 dasd_get_device(device
);
511 /* queue call to dasd_kick_device to the kernel event daemon. */
512 schedule_work(&device
->kick_work
);
516 * dasd_restore_device will schedule a call do do_restore_device to the kernel
519 static void do_restore_device(struct work_struct
*work
)
521 struct dasd_device
*device
= container_of(work
, struct dasd_device
,
523 device
->cdev
->drv
->restore(device
->cdev
);
524 dasd_put_device(device
);
527 void dasd_restore_device(struct dasd_device
*device
)
529 dasd_get_device(device
);
530 /* queue call to dasd_restore_device to the kernel event daemon. */
531 schedule_work(&device
->restore_device
);
535 * Set the target state for a device and starts the state change.
537 void dasd_set_target_state(struct dasd_device
*device
, int target
)
539 dasd_get_device(device
);
540 /* If we are in probeonly mode stop at DASD_STATE_READY. */
541 if (dasd_probeonly
&& target
> DASD_STATE_READY
)
542 target
= DASD_STATE_READY
;
543 if (device
->target
!= target
) {
544 if (device
->state
== target
) {
545 wake_up(&dasd_init_waitq
);
546 dasd_put_device(device
);
548 device
->target
= target
;
550 if (device
->state
!= device
->target
)
551 dasd_change_state(device
);
555 * Enable devices with device numbers in [from..to].
557 static inline int _wait_for_device(struct dasd_device
*device
)
559 return (device
->state
== device
->target
);
562 void dasd_enable_device(struct dasd_device
*device
)
564 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
565 if (device
->state
<= DASD_STATE_KNOWN
)
566 /* No discipline for device found. */
567 dasd_set_target_state(device
, DASD_STATE_NEW
);
568 /* Now wait for the devices to come up. */
569 wait_event(dasd_init_waitq
, _wait_for_device(device
));
573 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
575 #ifdef CONFIG_DASD_PROFILE
577 struct dasd_profile_info_t dasd_global_profile
;
578 unsigned int dasd_profile_level
= DASD_PROFILE_OFF
;
581 * Increments counter in global and local profiling structures.
583 #define dasd_profile_counter(value, counter, block) \
586 for (index = 0; index < 31 && value >> (2+index); index++); \
587 dasd_global_profile.counter[index]++; \
588 block->profile.counter[index]++; \
592 * Add profiling information for cqr before execution.
594 static void dasd_profile_start(struct dasd_block
*block
,
595 struct dasd_ccw_req
*cqr
,
599 unsigned int counter
;
601 if (dasd_profile_level
!= DASD_PROFILE_ON
)
604 /* count the length of the chanq for statistics */
606 list_for_each(l
, &block
->ccw_queue
)
609 dasd_global_profile
.dasd_io_nr_req
[counter
]++;
610 block
->profile
.dasd_io_nr_req
[counter
]++;
614 * Add profiling information for cqr after execution.
616 static void dasd_profile_end(struct dasd_block
*block
,
617 struct dasd_ccw_req
*cqr
,
620 long strtime
, irqtime
, endtime
, tottime
; /* in microseconds */
621 long tottimeps
, sectors
;
623 if (dasd_profile_level
!= DASD_PROFILE_ON
)
626 sectors
= blk_rq_sectors(req
);
627 if (!cqr
->buildclk
|| !cqr
->startclk
||
628 !cqr
->stopclk
|| !cqr
->endclk
||
632 strtime
= ((cqr
->startclk
- cqr
->buildclk
) >> 12);
633 irqtime
= ((cqr
->stopclk
- cqr
->startclk
) >> 12);
634 endtime
= ((cqr
->endclk
- cqr
->stopclk
) >> 12);
635 tottime
= ((cqr
->endclk
- cqr
->buildclk
) >> 12);
636 tottimeps
= tottime
/ sectors
;
638 if (!dasd_global_profile
.dasd_io_reqs
)
639 memset(&dasd_global_profile
, 0,
640 sizeof(struct dasd_profile_info_t
));
641 dasd_global_profile
.dasd_io_reqs
++;
642 dasd_global_profile
.dasd_io_sects
+= sectors
;
644 if (!block
->profile
.dasd_io_reqs
)
645 memset(&block
->profile
, 0,
646 sizeof(struct dasd_profile_info_t
));
647 block
->profile
.dasd_io_reqs
++;
648 block
->profile
.dasd_io_sects
+= sectors
;
650 dasd_profile_counter(sectors
, dasd_io_secs
, block
);
651 dasd_profile_counter(tottime
, dasd_io_times
, block
);
652 dasd_profile_counter(tottimeps
, dasd_io_timps
, block
);
653 dasd_profile_counter(strtime
, dasd_io_time1
, block
);
654 dasd_profile_counter(irqtime
, dasd_io_time2
, block
);
655 dasd_profile_counter(irqtime
/ sectors
, dasd_io_time2ps
, block
);
656 dasd_profile_counter(endtime
, dasd_io_time3
, block
);
659 #define dasd_profile_start(block, cqr, req) do {} while (0)
660 #define dasd_profile_end(block, cqr, req) do {} while (0)
661 #endif /* CONFIG_DASD_PROFILE */
664 * Allocate memory for a channel program with 'cplength' channel
665 * command words and 'datasize' additional space. There are two
666 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
667 * memory and 2) dasd_smalloc_request uses the static ccw memory
668 * that gets allocated for each device.
670 struct dasd_ccw_req
*dasd_kmalloc_request(char *magic
, int cplength
,
672 struct dasd_device
*device
)
674 struct dasd_ccw_req
*cqr
;
677 BUG_ON( magic
== NULL
|| datasize
> PAGE_SIZE
||
678 (cplength
*sizeof(struct ccw1
)) > PAGE_SIZE
);
680 cqr
= kzalloc(sizeof(struct dasd_ccw_req
), GFP_ATOMIC
);
682 return ERR_PTR(-ENOMEM
);
685 cqr
->cpaddr
= kcalloc(cplength
, sizeof(struct ccw1
),
686 GFP_ATOMIC
| GFP_DMA
);
687 if (cqr
->cpaddr
== NULL
) {
689 return ERR_PTR(-ENOMEM
);
694 cqr
->data
= kzalloc(datasize
, GFP_ATOMIC
| GFP_DMA
);
695 if (cqr
->data
== NULL
) {
698 return ERR_PTR(-ENOMEM
);
701 strncpy((char *) &cqr
->magic
, magic
, 4);
702 ASCEBC((char *) &cqr
->magic
, 4);
703 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
704 dasd_get_device(device
);
708 struct dasd_ccw_req
*dasd_smalloc_request(char *magic
, int cplength
,
710 struct dasd_device
*device
)
713 struct dasd_ccw_req
*cqr
;
718 BUG_ON( magic
== NULL
|| datasize
> PAGE_SIZE
||
719 (cplength
*sizeof(struct ccw1
)) > PAGE_SIZE
);
721 size
= (sizeof(struct dasd_ccw_req
) + 7L) & -8L;
723 size
+= cplength
* sizeof(struct ccw1
);
726 spin_lock_irqsave(&device
->mem_lock
, flags
);
727 cqr
= (struct dasd_ccw_req
*)
728 dasd_alloc_chunk(&device
->ccw_chunks
, size
);
729 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
731 return ERR_PTR(-ENOMEM
);
732 memset(cqr
, 0, sizeof(struct dasd_ccw_req
));
733 data
= (char *) cqr
+ ((sizeof(struct dasd_ccw_req
) + 7L) & -8L);
736 cqr
->cpaddr
= (struct ccw1
*) data
;
737 data
+= cplength
*sizeof(struct ccw1
);
738 memset(cqr
->cpaddr
, 0, cplength
*sizeof(struct ccw1
));
743 memset(cqr
->data
, 0, datasize
);
745 strncpy((char *) &cqr
->magic
, magic
, 4);
746 ASCEBC((char *) &cqr
->magic
, 4);
747 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
748 dasd_get_device(device
);
753 * Free memory of a channel program. This function needs to free all the
754 * idal lists that might have been created by dasd_set_cda and the
755 * struct dasd_ccw_req itself.
757 void dasd_kfree_request(struct dasd_ccw_req
*cqr
, struct dasd_device
*device
)
762 /* Clear any idals used for the request. */
765 clear_normalized_cda(ccw
);
766 } while (ccw
++->flags
& (CCW_FLAG_CC
| CCW_FLAG_DC
));
771 dasd_put_device(device
);
774 void dasd_sfree_request(struct dasd_ccw_req
*cqr
, struct dasd_device
*device
)
778 spin_lock_irqsave(&device
->mem_lock
, flags
);
779 dasd_free_chunk(&device
->ccw_chunks
, cqr
);
780 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
781 dasd_put_device(device
);
785 * Check discipline magic in cqr.
787 static inline int dasd_check_cqr(struct dasd_ccw_req
*cqr
)
789 struct dasd_device
*device
;
793 device
= cqr
->startdev
;
794 if (strncmp((char *) &cqr
->magic
, device
->discipline
->ebcname
, 4)) {
795 DBF_DEV_EVENT(DBF_WARNING
, device
,
796 " dasd_ccw_req 0x%08x magic doesn't match"
797 " discipline 0x%08x",
799 *(unsigned int *) device
->discipline
->name
);
806 * Terminate the current i/o and set the request to clear_pending.
807 * Timer keeps device runnig.
808 * ccw_device_clear can fail if the i/o subsystem
811 int dasd_term_IO(struct dasd_ccw_req
*cqr
)
813 struct dasd_device
*device
;
815 char errorstring
[ERRORLENGTH
];
818 rc
= dasd_check_cqr(cqr
);
822 device
= (struct dasd_device
*) cqr
->startdev
;
823 while ((retries
< 5) && (cqr
->status
== DASD_CQR_IN_IO
)) {
824 rc
= ccw_device_clear(device
->cdev
, (long) cqr
);
826 case 0: /* termination successful */
828 cqr
->status
= DASD_CQR_CLEAR_PENDING
;
829 cqr
->stopclk
= get_clock();
831 DBF_DEV_EVENT(DBF_DEBUG
, device
,
832 "terminate cqr %p successful",
836 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
837 "device gone, retry");
840 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
845 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
846 "device busy, retry later");
849 /* internal error 10 - unknown rc*/
850 snprintf(errorstring
, ERRORLENGTH
, "10 %d", rc
);
851 dev_err(&device
->cdev
->dev
, "An error occurred in the "
852 "DASD device driver, reason=%s\n", errorstring
);
858 dasd_schedule_device_bh(device
);
863 * Start the i/o. This start_IO can fail if the channel is really busy.
864 * In that case set up a timer to start the request later.
866 int dasd_start_IO(struct dasd_ccw_req
*cqr
)
868 struct dasd_device
*device
;
870 char errorstring
[ERRORLENGTH
];
873 rc
= dasd_check_cqr(cqr
);
878 device
= (struct dasd_device
*) cqr
->startdev
;
879 if (cqr
->retries
< 0) {
880 /* internal error 14 - start_IO run out of retries */
881 sprintf(errorstring
, "14 %p", cqr
);
882 dev_err(&device
->cdev
->dev
, "An error occurred in the DASD "
883 "device driver, reason=%s\n", errorstring
);
884 cqr
->status
= DASD_CQR_ERROR
;
887 cqr
->startclk
= get_clock();
888 cqr
->starttime
= jiffies
;
890 if (cqr
->cpmode
== 1) {
891 rc
= ccw_device_tm_start(device
->cdev
, cqr
->cpaddr
,
892 (long) cqr
, cqr
->lpm
);
894 rc
= ccw_device_start(device
->cdev
, cqr
->cpaddr
,
895 (long) cqr
, cqr
->lpm
, 0);
899 cqr
->status
= DASD_CQR_IN_IO
;
900 DBF_DEV_EVENT(DBF_DEBUG
, device
,
901 "start_IO: request %p started successful",
905 DBF_DEV_EVENT(DBF_DEBUG
, device
, "%s",
906 "start_IO: device busy, retry later");
909 DBF_DEV_EVENT(DBF_DEBUG
, device
, "%s",
910 "start_IO: request timeout, retry later");
913 /* -EACCES indicates that the request used only a
914 * subset of the available pathes and all these
916 * Do a retry with all available pathes.
918 cqr
->lpm
= LPM_ANYPATH
;
919 DBF_DEV_EVENT(DBF_DEBUG
, device
, "%s",
920 "start_IO: selected pathes gone,"
921 " retry on all pathes");
924 DBF_DEV_EVENT(DBF_DEBUG
, device
, "%s",
925 "start_IO: -ENODEV device gone, retry");
928 DBF_DEV_EVENT(DBF_DEBUG
, device
, "%s",
929 "start_IO: -EIO device gone, retry");
932 /* most likely caused in power management context */
933 DBF_DEV_EVENT(DBF_DEBUG
, device
, "%s",
934 "start_IO: -EINVAL device currently "
938 /* internal error 11 - unknown rc */
939 snprintf(errorstring
, ERRORLENGTH
, "11 %d", rc
);
940 dev_err(&device
->cdev
->dev
,
941 "An error occurred in the DASD device driver, "
942 "reason=%s\n", errorstring
);
951 * Timeout function for dasd devices. This is used for different purposes
952 * 1) missing interrupt handler for normal operation
953 * 2) delayed start of request where start_IO failed with -EBUSY
954 * 3) timeout for missing state change interrupts
955 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
956 * DASD_CQR_QUEUED for 2) and 3).
958 static void dasd_device_timeout(unsigned long ptr
)
961 struct dasd_device
*device
;
963 device
= (struct dasd_device
*) ptr
;
964 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
965 /* re-activate request queue */
966 device
->stopped
&= ~DASD_STOPPED_PENDING
;
967 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
968 dasd_schedule_device_bh(device
);
972 * Setup timeout for a device in jiffies.
974 void dasd_device_set_timer(struct dasd_device
*device
, int expires
)
977 del_timer(&device
->timer
);
979 mod_timer(&device
->timer
, jiffies
+ expires
);
983 * Clear timeout for a device.
985 void dasd_device_clear_timer(struct dasd_device
*device
)
987 del_timer(&device
->timer
);
990 static void dasd_handle_killed_request(struct ccw_device
*cdev
,
991 unsigned long intparm
)
993 struct dasd_ccw_req
*cqr
;
994 struct dasd_device
*device
;
998 cqr
= (struct dasd_ccw_req
*) intparm
;
999 if (cqr
->status
!= DASD_CQR_IN_IO
) {
1000 DBF_EVENT(DBF_DEBUG
,
1001 "invalid status in handle_killed_request: "
1002 "bus_id %s, status %02x",
1003 dev_name(&cdev
->dev
), cqr
->status
);
1007 device
= (struct dasd_device
*) cqr
->startdev
;
1008 if (device
== NULL
||
1009 device
!= dasd_device_from_cdev_locked(cdev
) ||
1010 strncmp(device
->discipline
->ebcname
, (char *) &cqr
->magic
, 4)) {
1011 DBF_DEV_EVENT(DBF_DEBUG
, device
, "invalid device in request: "
1012 "bus_id %s", dev_name(&cdev
->dev
));
1016 /* Schedule request to be retried. */
1017 cqr
->status
= DASD_CQR_QUEUED
;
1019 dasd_device_clear_timer(device
);
1020 dasd_schedule_device_bh(device
);
1021 dasd_put_device(device
);
1024 void dasd_generic_handle_state_change(struct dasd_device
*device
)
1026 /* First of all start sense subsystem status request. */
1027 dasd_eer_snss(device
);
1029 device
->stopped
&= ~DASD_STOPPED_PENDING
;
1030 dasd_schedule_device_bh(device
);
1032 dasd_schedule_block_bh(device
->block
);
1036 * Interrupt handler for "normal" ssch-io based dasd devices.
1038 void dasd_int_handler(struct ccw_device
*cdev
, unsigned long intparm
,
1041 struct dasd_ccw_req
*cqr
, *next
;
1042 struct dasd_device
*device
;
1043 unsigned long long now
;
1047 switch (PTR_ERR(irb
)) {
1051 DBF_EVENT(DBF_WARNING
, "%s(%s): request timed out\n",
1052 __func__
, dev_name(&cdev
->dev
));
1055 DBF_EVENT(DBF_WARNING
, "%s(%s): unknown error %ld\n",
1056 __func__
, dev_name(&cdev
->dev
), PTR_ERR(irb
));
1058 dasd_handle_killed_request(cdev
, intparm
);
1064 /* check for unsolicited interrupts */
1065 cqr
= (struct dasd_ccw_req
*) intparm
;
1066 if (!cqr
|| ((scsw_cc(&irb
->scsw
) == 1) &&
1067 (scsw_fctl(&irb
->scsw
) & SCSW_FCTL_START_FUNC
) &&
1068 (scsw_stctl(&irb
->scsw
) & SCSW_STCTL_STATUS_PEND
))) {
1069 if (cqr
&& cqr
->status
== DASD_CQR_IN_IO
)
1070 cqr
->status
= DASD_CQR_QUEUED
;
1071 device
= dasd_device_from_cdev_locked(cdev
);
1072 if (!IS_ERR(device
)) {
1073 dasd_device_clear_timer(device
);
1074 device
->discipline
->handle_unsolicited_interrupt(device
,
1076 dasd_put_device(device
);
1081 device
= (struct dasd_device
*) cqr
->startdev
;
1083 strncmp(device
->discipline
->ebcname
, (char *) &cqr
->magic
, 4)) {
1084 DBF_DEV_EVENT(DBF_DEBUG
, device
, "invalid device in request: "
1085 "bus_id %s", dev_name(&cdev
->dev
));
1089 /* Check for clear pending */
1090 if (cqr
->status
== DASD_CQR_CLEAR_PENDING
&&
1091 scsw_fctl(&irb
->scsw
) & SCSW_FCTL_CLEAR_FUNC
) {
1092 cqr
->status
= DASD_CQR_CLEARED
;
1093 dasd_device_clear_timer(device
);
1094 wake_up(&dasd_flush_wq
);
1095 dasd_schedule_device_bh(device
);
1099 /* check status - the request might have been killed by dyn detach */
1100 if (cqr
->status
!= DASD_CQR_IN_IO
) {
1101 DBF_DEV_EVENT(DBF_DEBUG
, device
, "invalid status: bus_id %s, "
1102 "status %02x", dev_name(&cdev
->dev
), cqr
->status
);
1108 if (scsw_dstat(&irb
->scsw
) == (DEV_STAT_CHN_END
| DEV_STAT_DEV_END
) &&
1109 scsw_cstat(&irb
->scsw
) == 0) {
1110 /* request was completed successfully */
1111 cqr
->status
= DASD_CQR_SUCCESS
;
1113 /* Start first request on queue if possible -> fast_io. */
1114 if (cqr
->devlist
.next
!= &device
->ccw_queue
) {
1115 next
= list_entry(cqr
->devlist
.next
,
1116 struct dasd_ccw_req
, devlist
);
1118 } else { /* error */
1119 memcpy(&cqr
->irb
, irb
, sizeof(struct irb
));
1120 /* log sense for every failed I/O to s390 debugfeature */
1121 dasd_log_sense_dbf(cqr
, irb
);
1122 if (device
->features
& DASD_FEATURE_ERPLOG
) {
1123 dasd_log_sense(cqr
, irb
);
1127 * If we don't want complex ERP for this request, then just
1128 * reset this and retry it in the fastpath
1130 if (!test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
) &&
1132 if (cqr
->lpm
== LPM_ANYPATH
)
1133 DBF_DEV_EVENT(DBF_DEBUG
, device
,
1134 "default ERP in fastpath "
1135 "(%i retries left)",
1137 cqr
->lpm
= LPM_ANYPATH
;
1138 cqr
->status
= DASD_CQR_QUEUED
;
1141 cqr
->status
= DASD_CQR_ERROR
;
1143 if (next
&& (next
->status
== DASD_CQR_QUEUED
) &&
1144 (!device
->stopped
)) {
1145 if (device
->discipline
->start_IO(next
) == 0)
1146 expires
= next
->expires
;
1149 dasd_device_set_timer(device
, expires
);
1151 dasd_device_clear_timer(device
);
1152 dasd_schedule_device_bh(device
);
1156 * If we have an error on a dasd_block layer request then we cancel
1157 * and return all further requests from the same dasd_block as well.
1159 static void __dasd_device_recovery(struct dasd_device
*device
,
1160 struct dasd_ccw_req
*ref_cqr
)
1162 struct list_head
*l
, *n
;
1163 struct dasd_ccw_req
*cqr
;
1166 * only requeue request that came from the dasd_block layer
1168 if (!ref_cqr
->block
)
1171 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1172 cqr
= list_entry(l
, struct dasd_ccw_req
, devlist
);
1173 if (cqr
->status
== DASD_CQR_QUEUED
&&
1174 ref_cqr
->block
== cqr
->block
) {
1175 cqr
->status
= DASD_CQR_CLEARED
;
1181 * Remove those ccw requests from the queue that need to be returned
1182 * to the upper layer.
1184 static void __dasd_device_process_ccw_queue(struct dasd_device
*device
,
1185 struct list_head
*final_queue
)
1187 struct list_head
*l
, *n
;
1188 struct dasd_ccw_req
*cqr
;
1190 /* Process request with final status. */
1191 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1192 cqr
= list_entry(l
, struct dasd_ccw_req
, devlist
);
1194 /* Stop list processing at the first non-final request. */
1195 if (cqr
->status
== DASD_CQR_QUEUED
||
1196 cqr
->status
== DASD_CQR_IN_IO
||
1197 cqr
->status
== DASD_CQR_CLEAR_PENDING
)
1199 if (cqr
->status
== DASD_CQR_ERROR
) {
1200 __dasd_device_recovery(device
, cqr
);
1202 /* Rechain finished requests to final queue */
1203 list_move_tail(&cqr
->devlist
, final_queue
);
1208 * the cqrs from the final queue are returned to the upper layer
1209 * by setting a dasd_block state and calling the callback function
1211 static void __dasd_device_process_final_queue(struct dasd_device
*device
,
1212 struct list_head
*final_queue
)
1214 struct list_head
*l
, *n
;
1215 struct dasd_ccw_req
*cqr
;
1216 struct dasd_block
*block
;
1217 void (*callback
)(struct dasd_ccw_req
*, void *data
);
1218 void *callback_data
;
1219 char errorstring
[ERRORLENGTH
];
1221 list_for_each_safe(l
, n
, final_queue
) {
1222 cqr
= list_entry(l
, struct dasd_ccw_req
, devlist
);
1223 list_del_init(&cqr
->devlist
);
1225 callback
= cqr
->callback
;
1226 callback_data
= cqr
->callback_data
;
1228 spin_lock_bh(&block
->queue_lock
);
1229 switch (cqr
->status
) {
1230 case DASD_CQR_SUCCESS
:
1231 cqr
->status
= DASD_CQR_DONE
;
1233 case DASD_CQR_ERROR
:
1234 cqr
->status
= DASD_CQR_NEED_ERP
;
1236 case DASD_CQR_CLEARED
:
1237 cqr
->status
= DASD_CQR_TERMINATED
;
1240 /* internal error 12 - wrong cqr status*/
1241 snprintf(errorstring
, ERRORLENGTH
, "12 %p %x02", cqr
, cqr
->status
);
1242 dev_err(&device
->cdev
->dev
,
1243 "An error occurred in the DASD device driver, "
1244 "reason=%s\n", errorstring
);
1247 if (cqr
->callback
!= NULL
)
1248 (callback
)(cqr
, callback_data
);
1250 spin_unlock_bh(&block
->queue_lock
);
1255 * Take a look at the first request on the ccw queue and check
1256 * if it reached its expire time. If so, terminate the IO.
1258 static void __dasd_device_check_expire(struct dasd_device
*device
)
1260 struct dasd_ccw_req
*cqr
;
1262 if (list_empty(&device
->ccw_queue
))
1264 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, devlist
);
1265 if ((cqr
->status
== DASD_CQR_IN_IO
&& cqr
->expires
!= 0) &&
1266 (time_after_eq(jiffies
, cqr
->expires
+ cqr
->starttime
))) {
1267 if (device
->discipline
->term_IO(cqr
) != 0) {
1268 /* Hmpf, try again in 5 sec */
1269 dev_err(&device
->cdev
->dev
,
1270 "cqr %p timed out (%is) but cannot be "
1271 "ended, retrying in 5 s\n",
1272 cqr
, (cqr
->expires
/HZ
));
1273 cqr
->expires
+= 5*HZ
;
1274 dasd_device_set_timer(device
, 5*HZ
);
1276 dev_err(&device
->cdev
->dev
,
1277 "cqr %p timed out (%is), %i retries "
1278 "remaining\n", cqr
, (cqr
->expires
/HZ
),
1285 * Take a look at the first request on the ccw queue and check
1286 * if it needs to be started.
1288 static void __dasd_device_start_head(struct dasd_device
*device
)
1290 struct dasd_ccw_req
*cqr
;
1293 if (list_empty(&device
->ccw_queue
))
1295 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, devlist
);
1296 if (cqr
->status
!= DASD_CQR_QUEUED
)
1298 /* when device is stopped, return request to previous layer */
1299 if (device
->stopped
) {
1300 cqr
->status
= DASD_CQR_CLEARED
;
1301 dasd_schedule_device_bh(device
);
1305 rc
= device
->discipline
->start_IO(cqr
);
1307 dasd_device_set_timer(device
, cqr
->expires
);
1308 else if (rc
== -EACCES
) {
1309 dasd_schedule_device_bh(device
);
1311 /* Hmpf, try again in 1/2 sec */
1312 dasd_device_set_timer(device
, 50);
1316 * Go through all request on the dasd_device request queue,
1317 * terminate them on the cdev if necessary, and return them to the
1318 * submitting layer via callback.
1320 * Make sure that all 'submitting layers' still exist when
1321 * this function is called!. In other words, when 'device' is a base
1322 * device then all block layer requests must have been removed before
1323 * via dasd_flush_block_queue.
1325 int dasd_flush_device_queue(struct dasd_device
*device
)
1327 struct dasd_ccw_req
*cqr
, *n
;
1329 struct list_head flush_queue
;
1331 INIT_LIST_HEAD(&flush_queue
);
1332 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1334 list_for_each_entry_safe(cqr
, n
, &device
->ccw_queue
, devlist
) {
1335 /* Check status and move request to flush_queue */
1336 switch (cqr
->status
) {
1337 case DASD_CQR_IN_IO
:
1338 rc
= device
->discipline
->term_IO(cqr
);
1340 /* unable to terminate requeust */
1341 dev_err(&device
->cdev
->dev
,
1342 "Flushing the DASD request queue "
1343 "failed for request %p\n", cqr
);
1344 /* stop flush processing */
1348 case DASD_CQR_QUEUED
:
1349 cqr
->stopclk
= get_clock();
1350 cqr
->status
= DASD_CQR_CLEARED
;
1352 default: /* no need to modify the others */
1355 list_move_tail(&cqr
->devlist
, &flush_queue
);
1358 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1360 * After this point all requests must be in state CLEAR_PENDING,
1361 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
1362 * one of the others.
1364 list_for_each_entry_safe(cqr
, n
, &flush_queue
, devlist
)
1365 wait_event(dasd_flush_wq
,
1366 (cqr
->status
!= DASD_CQR_CLEAR_PENDING
));
1368 * Now set each request back to TERMINATED, DONE or NEED_ERP
1369 * and call the callback function of flushed requests
1371 __dasd_device_process_final_queue(device
, &flush_queue
);
1376 * Acquire the device lock and process queues for the device.
1378 static void dasd_device_tasklet(struct dasd_device
*device
)
1380 struct list_head final_queue
;
1382 atomic_set (&device
->tasklet_scheduled
, 0);
1383 INIT_LIST_HEAD(&final_queue
);
1384 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1385 /* Check expire time of first request on the ccw queue. */
1386 __dasd_device_check_expire(device
);
1387 /* find final requests on ccw queue */
1388 __dasd_device_process_ccw_queue(device
, &final_queue
);
1389 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1390 /* Now call the callback function of requests with final status */
1391 __dasd_device_process_final_queue(device
, &final_queue
);
1392 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1393 /* Now check if the head of the ccw queue needs to be started. */
1394 __dasd_device_start_head(device
);
1395 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1396 dasd_put_device(device
);
1400 * Schedules a call to dasd_tasklet over the device tasklet.
1402 void dasd_schedule_device_bh(struct dasd_device
*device
)
1404 /* Protect against rescheduling. */
1405 if (atomic_cmpxchg (&device
->tasklet_scheduled
, 0, 1) != 0)
1407 dasd_get_device(device
);
1408 tasklet_hi_schedule(&device
->tasklet
);
1412 * Queue a request to the head of the device ccw_queue.
1413 * Start the I/O if possible.
1415 void dasd_add_request_head(struct dasd_ccw_req
*cqr
)
1417 struct dasd_device
*device
;
1418 unsigned long flags
;
1420 device
= cqr
->startdev
;
1421 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1422 cqr
->status
= DASD_CQR_QUEUED
;
1423 list_add(&cqr
->devlist
, &device
->ccw_queue
);
1424 /* let the bh start the request to keep them in order */
1425 dasd_schedule_device_bh(device
);
1426 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1430 * Queue a request to the tail of the device ccw_queue.
1431 * Start the I/O if possible.
1433 void dasd_add_request_tail(struct dasd_ccw_req
*cqr
)
1435 struct dasd_device
*device
;
1436 unsigned long flags
;
1438 device
= cqr
->startdev
;
1439 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1440 cqr
->status
= DASD_CQR_QUEUED
;
1441 list_add_tail(&cqr
->devlist
, &device
->ccw_queue
);
1442 /* let the bh start the request to keep them in order */
1443 dasd_schedule_device_bh(device
);
1444 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1448 * Wakeup helper for the 'sleep_on' functions.
1450 static void dasd_wakeup_cb(struct dasd_ccw_req
*cqr
, void *data
)
1452 wake_up((wait_queue_head_t
*) data
);
1455 static inline int _wait_for_wakeup(struct dasd_ccw_req
*cqr
)
1457 struct dasd_device
*device
;
1460 device
= cqr
->startdev
;
1461 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1462 rc
= ((cqr
->status
== DASD_CQR_DONE
||
1463 cqr
->status
== DASD_CQR_NEED_ERP
||
1464 cqr
->status
== DASD_CQR_TERMINATED
) &&
1465 list_empty(&cqr
->devlist
));
1466 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1471 * Queue a request to the tail of the device ccw_queue and wait for
1474 int dasd_sleep_on(struct dasd_ccw_req
*cqr
)
1476 struct dasd_device
*device
;
1479 device
= cqr
->startdev
;
1481 cqr
->callback
= dasd_wakeup_cb
;
1482 cqr
->callback_data
= (void *) &generic_waitq
;
1483 dasd_add_request_tail(cqr
);
1484 wait_event(generic_waitq
, _wait_for_wakeup(cqr
));
1486 if (cqr
->status
== DASD_CQR_DONE
)
1488 else if (cqr
->intrc
)
1496 * Queue a request to the tail of the device ccw_queue and wait
1497 * interruptible for it's completion.
1499 int dasd_sleep_on_interruptible(struct dasd_ccw_req
*cqr
)
1501 struct dasd_device
*device
;
1504 device
= cqr
->startdev
;
1505 cqr
->callback
= dasd_wakeup_cb
;
1506 cqr
->callback_data
= (void *) &generic_waitq
;
1507 dasd_add_request_tail(cqr
);
1508 rc
= wait_event_interruptible(generic_waitq
, _wait_for_wakeup(cqr
));
1509 if (rc
== -ERESTARTSYS
) {
1510 dasd_cancel_req(cqr
);
1511 /* wait (non-interruptible) for final status */
1512 wait_event(generic_waitq
, _wait_for_wakeup(cqr
));
1516 if (cqr
->status
== DASD_CQR_DONE
)
1518 else if (cqr
->intrc
)
1526 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
1527 * for eckd devices) the currently running request has to be terminated
1528 * and be put back to status queued, before the special request is added
1529 * to the head of the queue. Then the special request is waited on normally.
1531 static inline int _dasd_term_running_cqr(struct dasd_device
*device
)
1533 struct dasd_ccw_req
*cqr
;
1535 if (list_empty(&device
->ccw_queue
))
1537 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, devlist
);
1538 return device
->discipline
->term_IO(cqr
);
1541 int dasd_sleep_on_immediatly(struct dasd_ccw_req
*cqr
)
1543 struct dasd_device
*device
;
1546 device
= cqr
->startdev
;
1547 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1548 rc
= _dasd_term_running_cqr(device
);
1550 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1554 cqr
->callback
= dasd_wakeup_cb
;
1555 cqr
->callback_data
= (void *) &generic_waitq
;
1556 cqr
->status
= DASD_CQR_QUEUED
;
1557 list_add(&cqr
->devlist
, &device
->ccw_queue
);
1559 /* let the bh start the request to keep them in order */
1560 dasd_schedule_device_bh(device
);
1562 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1564 wait_event(generic_waitq
, _wait_for_wakeup(cqr
));
1566 if (cqr
->status
== DASD_CQR_DONE
)
1568 else if (cqr
->intrc
)
1576 * Cancels a request that was started with dasd_sleep_on_req.
1577 * This is useful to timeout requests. The request will be
1578 * terminated if it is currently in i/o.
1579 * Returns 1 if the request has been terminated.
1580 * 0 if there was no need to terminate the request (not started yet)
1581 * negative error code if termination failed
1582 * Cancellation of a request is an asynchronous operation! The calling
1583 * function has to wait until the request is properly returned via callback.
1585 int dasd_cancel_req(struct dasd_ccw_req
*cqr
)
1587 struct dasd_device
*device
= cqr
->startdev
;
1588 unsigned long flags
;
1592 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1593 switch (cqr
->status
) {
1594 case DASD_CQR_QUEUED
:
1595 /* request was not started - just set to cleared */
1596 cqr
->status
= DASD_CQR_CLEARED
;
1598 case DASD_CQR_IN_IO
:
1599 /* request in IO - terminate IO and release again */
1600 rc
= device
->discipline
->term_IO(cqr
);
1602 dev_err(&device
->cdev
->dev
,
1603 "Cancelling request %p failed with rc=%d\n",
1606 cqr
->stopclk
= get_clock();
1610 default: /* already finished or clear pending - do nothing */
1613 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1614 dasd_schedule_device_bh(device
);
1620 * SECTION: Operations of the dasd_block layer.
1624 * Timeout function for dasd_block. This is used when the block layer
1625 * is waiting for something that may not come reliably, (e.g. a state
1628 static void dasd_block_timeout(unsigned long ptr
)
1630 unsigned long flags
;
1631 struct dasd_block
*block
;
1633 block
= (struct dasd_block
*) ptr
;
1634 spin_lock_irqsave(get_ccwdev_lock(block
->base
->cdev
), flags
);
1635 /* re-activate request queue */
1636 block
->base
->stopped
&= ~DASD_STOPPED_PENDING
;
1637 spin_unlock_irqrestore(get_ccwdev_lock(block
->base
->cdev
), flags
);
1638 dasd_schedule_block_bh(block
);
1642 * Setup timeout for a dasd_block in jiffies.
1644 void dasd_block_set_timer(struct dasd_block
*block
, int expires
)
1647 del_timer(&block
->timer
);
1649 mod_timer(&block
->timer
, jiffies
+ expires
);
1653 * Clear timeout for a dasd_block.
1655 void dasd_block_clear_timer(struct dasd_block
*block
)
1657 del_timer(&block
->timer
);
1661 * Process finished error recovery ccw.
1663 static inline void __dasd_block_process_erp(struct dasd_block
*block
,
1664 struct dasd_ccw_req
*cqr
)
1666 dasd_erp_fn_t erp_fn
;
1667 struct dasd_device
*device
= block
->base
;
1669 if (cqr
->status
== DASD_CQR_DONE
)
1670 DBF_DEV_EVENT(DBF_NOTICE
, device
, "%s", "ERP successful");
1672 dev_err(&device
->cdev
->dev
, "ERP failed for the DASD\n");
1673 erp_fn
= device
->discipline
->erp_postaction(cqr
);
1678 * Fetch requests from the block device queue.
1680 static void __dasd_process_request_queue(struct dasd_block
*block
)
1682 struct request_queue
*queue
;
1683 struct request
*req
;
1684 struct dasd_ccw_req
*cqr
;
1685 struct dasd_device
*basedev
;
1686 unsigned long flags
;
1687 queue
= block
->request_queue
;
1688 basedev
= block
->base
;
1689 /* No queue ? Then there is nothing to do. */
1694 * We requeue request from the block device queue to the ccw
1695 * queue only in two states. In state DASD_STATE_READY the
1696 * partition detection is done and we need to requeue requests
1697 * for that. State DASD_STATE_ONLINE is normal block device
1700 if (basedev
->state
< DASD_STATE_READY
)
1702 /* Now we try to fetch requests from the request queue */
1703 while (!blk_queue_plugged(queue
) && (req
= blk_peek_request(queue
))) {
1704 if (basedev
->features
& DASD_FEATURE_READONLY
&&
1705 rq_data_dir(req
) == WRITE
) {
1706 DBF_DEV_EVENT(DBF_ERR
, basedev
,
1707 "Rejecting write request %p",
1709 blk_start_request(req
);
1710 __blk_end_request_all(req
, -EIO
);
1713 cqr
= basedev
->discipline
->build_cp(basedev
, block
, req
);
1715 if (PTR_ERR(cqr
) == -EBUSY
)
1716 break; /* normal end condition */
1717 if (PTR_ERR(cqr
) == -ENOMEM
)
1718 break; /* terminate request queue loop */
1719 if (PTR_ERR(cqr
) == -EAGAIN
) {
1721 * The current request cannot be build right
1722 * now, we have to try later. If this request
1723 * is the head-of-queue we stop the device
1726 if (!list_empty(&block
->ccw_queue
))
1728 spin_lock_irqsave(get_ccwdev_lock(basedev
->cdev
), flags
);
1729 basedev
->stopped
|= DASD_STOPPED_PENDING
;
1730 spin_unlock_irqrestore(get_ccwdev_lock(basedev
->cdev
), flags
);
1731 dasd_block_set_timer(block
, HZ
/2);
1734 DBF_DEV_EVENT(DBF_ERR
, basedev
,
1735 "CCW creation failed (rc=%ld) "
1738 blk_start_request(req
);
1739 __blk_end_request_all(req
, -EIO
);
1743 * Note: callback is set to dasd_return_cqr_cb in
1744 * __dasd_block_start_head to cover erp requests as well
1746 cqr
->callback_data
= (void *) req
;
1747 cqr
->status
= DASD_CQR_FILLED
;
1748 blk_start_request(req
);
1749 list_add_tail(&cqr
->blocklist
, &block
->ccw_queue
);
1750 dasd_profile_start(block
, cqr
, req
);
1754 static void __dasd_cleanup_cqr(struct dasd_ccw_req
*cqr
)
1756 struct request
*req
;
1760 req
= (struct request
*) cqr
->callback_data
;
1761 dasd_profile_end(cqr
->block
, cqr
, req
);
1762 status
= cqr
->block
->base
->discipline
->free_cp(cqr
, req
);
1764 error
= status
? status
: -EIO
;
1765 __blk_end_request_all(req
, error
);
1769 * Process ccw request queue.
1771 static void __dasd_process_block_ccw_queue(struct dasd_block
*block
,
1772 struct list_head
*final_queue
)
1774 struct list_head
*l
, *n
;
1775 struct dasd_ccw_req
*cqr
;
1776 dasd_erp_fn_t erp_fn
;
1777 unsigned long flags
;
1778 struct dasd_device
*base
= block
->base
;
1781 /* Process request with final status. */
1782 list_for_each_safe(l
, n
, &block
->ccw_queue
) {
1783 cqr
= list_entry(l
, struct dasd_ccw_req
, blocklist
);
1784 if (cqr
->status
!= DASD_CQR_DONE
&&
1785 cqr
->status
!= DASD_CQR_FAILED
&&
1786 cqr
->status
!= DASD_CQR_NEED_ERP
&&
1787 cqr
->status
!= DASD_CQR_TERMINATED
)
1790 if (cqr
->status
== DASD_CQR_TERMINATED
) {
1791 base
->discipline
->handle_terminated_request(cqr
);
1795 /* Process requests that may be recovered */
1796 if (cqr
->status
== DASD_CQR_NEED_ERP
) {
1797 erp_fn
= base
->discipline
->erp_action(cqr
);
1802 /* log sense for fatal error */
1803 if (cqr
->status
== DASD_CQR_FAILED
) {
1804 dasd_log_sense(cqr
, &cqr
->irb
);
1807 /* First of all call extended error reporting. */
1808 if (dasd_eer_enabled(base
) &&
1809 cqr
->status
== DASD_CQR_FAILED
) {
1810 dasd_eer_write(base
, cqr
, DASD_EER_FATALERROR
);
1812 /* restart request */
1813 cqr
->status
= DASD_CQR_FILLED
;
1815 spin_lock_irqsave(get_ccwdev_lock(base
->cdev
), flags
);
1816 base
->stopped
|= DASD_STOPPED_QUIESCE
;
1817 spin_unlock_irqrestore(get_ccwdev_lock(base
->cdev
),
1822 /* Process finished ERP request. */
1824 __dasd_block_process_erp(block
, cqr
);
1828 /* Rechain finished requests to final queue */
1829 cqr
->endclk
= get_clock();
1830 list_move_tail(&cqr
->blocklist
, final_queue
);
1834 static void dasd_return_cqr_cb(struct dasd_ccw_req
*cqr
, void *data
)
1836 dasd_schedule_block_bh(cqr
->block
);
1839 static void __dasd_block_start_head(struct dasd_block
*block
)
1841 struct dasd_ccw_req
*cqr
;
1843 if (list_empty(&block
->ccw_queue
))
1845 /* We allways begin with the first requests on the queue, as some
1846 * of previously started requests have to be enqueued on a
1847 * dasd_device again for error recovery.
1849 list_for_each_entry(cqr
, &block
->ccw_queue
, blocklist
) {
1850 if (cqr
->status
!= DASD_CQR_FILLED
)
1852 /* Non-temporary stop condition will trigger fail fast */
1853 if (block
->base
->stopped
& ~DASD_STOPPED_PENDING
&&
1854 test_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
) &&
1855 (!dasd_eer_enabled(block
->base
))) {
1856 cqr
->status
= DASD_CQR_FAILED
;
1857 dasd_schedule_block_bh(block
);
1860 /* Don't try to start requests if device is stopped */
1861 if (block
->base
->stopped
)
1864 /* just a fail safe check, should not happen */
1866 cqr
->startdev
= block
->base
;
1868 /* make sure that the requests we submit find their way back */
1869 cqr
->callback
= dasd_return_cqr_cb
;
1871 dasd_add_request_tail(cqr
);
1876 * Central dasd_block layer routine. Takes requests from the generic
1877 * block layer request queue, creates ccw requests, enqueues them on
1878 * a dasd_device and processes ccw requests that have been returned.
1880 static void dasd_block_tasklet(struct dasd_block
*block
)
1882 struct list_head final_queue
;
1883 struct list_head
*l
, *n
;
1884 struct dasd_ccw_req
*cqr
;
1886 atomic_set(&block
->tasklet_scheduled
, 0);
1887 INIT_LIST_HEAD(&final_queue
);
1888 spin_lock(&block
->queue_lock
);
1889 /* Finish off requests on ccw queue */
1890 __dasd_process_block_ccw_queue(block
, &final_queue
);
1891 spin_unlock(&block
->queue_lock
);
1892 /* Now call the callback function of requests with final status */
1893 spin_lock_irq(&block
->request_queue_lock
);
1894 list_for_each_safe(l
, n
, &final_queue
) {
1895 cqr
= list_entry(l
, struct dasd_ccw_req
, blocklist
);
1896 list_del_init(&cqr
->blocklist
);
1897 __dasd_cleanup_cqr(cqr
);
1899 spin_lock(&block
->queue_lock
);
1900 /* Get new request from the block device request queue */
1901 __dasd_process_request_queue(block
);
1902 /* Now check if the head of the ccw queue needs to be started. */
1903 __dasd_block_start_head(block
);
1904 spin_unlock(&block
->queue_lock
);
1905 spin_unlock_irq(&block
->request_queue_lock
);
1906 dasd_put_device(block
->base
);
1909 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req
*cqr
, void *data
)
1911 wake_up(&dasd_flush_wq
);
1915 * Go through all request on the dasd_block request queue, cancel them
1916 * on the respective dasd_device, and return them to the generic
1919 static int dasd_flush_block_queue(struct dasd_block
*block
)
1921 struct dasd_ccw_req
*cqr
, *n
;
1923 struct list_head flush_queue
;
1925 INIT_LIST_HEAD(&flush_queue
);
1926 spin_lock_bh(&block
->queue_lock
);
1929 list_for_each_entry_safe(cqr
, n
, &block
->ccw_queue
, blocklist
) {
1930 /* if this request currently owned by a dasd_device cancel it */
1931 if (cqr
->status
>= DASD_CQR_QUEUED
)
1932 rc
= dasd_cancel_req(cqr
);
1935 /* Rechain request (including erp chain) so it won't be
1936 * touched by the dasd_block_tasklet anymore.
1937 * Replace the callback so we notice when the request
1938 * is returned from the dasd_device layer.
1940 cqr
->callback
= _dasd_wake_block_flush_cb
;
1941 for (i
= 0; cqr
!= NULL
; cqr
= cqr
->refers
, i
++)
1942 list_move_tail(&cqr
->blocklist
, &flush_queue
);
1944 /* moved more than one request - need to restart */
1947 spin_unlock_bh(&block
->queue_lock
);
1948 /* Now call the callback function of flushed requests */
1950 list_for_each_entry_safe(cqr
, n
, &flush_queue
, blocklist
) {
1951 wait_event(dasd_flush_wq
, (cqr
->status
< DASD_CQR_QUEUED
));
1952 /* Process finished ERP request. */
1954 spin_lock_bh(&block
->queue_lock
);
1955 __dasd_block_process_erp(block
, cqr
);
1956 spin_unlock_bh(&block
->queue_lock
);
1957 /* restart list_for_xx loop since dasd_process_erp
1958 * might remove multiple elements */
1961 /* call the callback function */
1962 spin_lock_irq(&block
->request_queue_lock
);
1963 cqr
->endclk
= get_clock();
1964 list_del_init(&cqr
->blocklist
);
1965 __dasd_cleanup_cqr(cqr
);
1966 spin_unlock_irq(&block
->request_queue_lock
);
1972 * Schedules a call to dasd_tasklet over the device tasklet.
1974 void dasd_schedule_block_bh(struct dasd_block
*block
)
1976 /* Protect against rescheduling. */
1977 if (atomic_cmpxchg(&block
->tasklet_scheduled
, 0, 1) != 0)
1979 /* life cycle of block is bound to it's base device */
1980 dasd_get_device(block
->base
);
1981 tasklet_hi_schedule(&block
->tasklet
);
1986 * SECTION: external block device operations
1987 * (request queue handling, open, release, etc.)
1991 * Dasd request queue function. Called from ll_rw_blk.c
1993 static void do_dasd_request(struct request_queue
*queue
)
1995 struct dasd_block
*block
;
1997 block
= queue
->queuedata
;
1998 spin_lock(&block
->queue_lock
);
1999 /* Get new request from the block device request queue */
2000 __dasd_process_request_queue(block
);
2001 /* Now check if the head of the ccw queue needs to be started. */
2002 __dasd_block_start_head(block
);
2003 spin_unlock(&block
->queue_lock
);
2007 * Allocate and initialize request queue and default I/O scheduler.
2009 static int dasd_alloc_queue(struct dasd_block
*block
)
2013 block
->request_queue
= blk_init_queue(do_dasd_request
,
2014 &block
->request_queue_lock
);
2015 if (block
->request_queue
== NULL
)
2018 block
->request_queue
->queuedata
= block
;
2020 elevator_exit(block
->request_queue
->elevator
);
2021 block
->request_queue
->elevator
= NULL
;
2022 rc
= elevator_init(block
->request_queue
, "deadline");
2024 blk_cleanup_queue(block
->request_queue
);
2031 * Allocate and initialize request queue.
2033 static void dasd_setup_queue(struct dasd_block
*block
)
2037 blk_queue_logical_block_size(block
->request_queue
, block
->bp_block
);
2038 max
= block
->base
->discipline
->max_blocks
<< block
->s2b_shift
;
2039 blk_queue_max_sectors(block
->request_queue
, max
);
2040 blk_queue_max_phys_segments(block
->request_queue
, -1L);
2041 blk_queue_max_hw_segments(block
->request_queue
, -1L);
2042 /* with page sized segments we can translate each segement into
2045 blk_queue_max_segment_size(block
->request_queue
, PAGE_SIZE
);
2046 blk_queue_segment_boundary(block
->request_queue
, PAGE_SIZE
- 1);
2047 blk_queue_ordered(block
->request_queue
, QUEUE_ORDERED_DRAIN
, NULL
);
2051 * Deactivate and free request queue.
2053 static void dasd_free_queue(struct dasd_block
*block
)
2055 if (block
->request_queue
) {
2056 blk_cleanup_queue(block
->request_queue
);
2057 block
->request_queue
= NULL
;
2062 * Flush request on the request queue.
2064 static void dasd_flush_request_queue(struct dasd_block
*block
)
2066 struct request
*req
;
2068 if (!block
->request_queue
)
2071 spin_lock_irq(&block
->request_queue_lock
);
2072 while ((req
= blk_fetch_request(block
->request_queue
)))
2073 __blk_end_request_all(req
, -EIO
);
2074 spin_unlock_irq(&block
->request_queue_lock
);
2077 static int dasd_open(struct block_device
*bdev
, fmode_t mode
)
2079 struct dasd_block
*block
= bdev
->bd_disk
->private_data
;
2080 struct dasd_device
*base
= block
->base
;
2083 atomic_inc(&block
->open_count
);
2084 if (test_bit(DASD_FLAG_OFFLINE
, &base
->flags
)) {
2089 if (!try_module_get(base
->discipline
->owner
)) {
2094 if (dasd_probeonly
) {
2095 dev_info(&base
->cdev
->dev
,
2096 "Accessing the DASD failed because it is in "
2097 "probeonly mode\n");
2102 if (base
->state
<= DASD_STATE_BASIC
) {
2103 DBF_DEV_EVENT(DBF_ERR
, base
, " %s",
2104 " Cannot open unrecognized device");
2112 module_put(base
->discipline
->owner
);
2114 atomic_dec(&block
->open_count
);
2118 static int dasd_release(struct gendisk
*disk
, fmode_t mode
)
2120 struct dasd_block
*block
= disk
->private_data
;
2122 atomic_dec(&block
->open_count
);
2123 module_put(block
->base
->discipline
->owner
);
2128 * Return disk geometry.
2130 static int dasd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
2132 struct dasd_block
*block
;
2133 struct dasd_device
*base
;
2135 block
= bdev
->bd_disk
->private_data
;
2140 if (!base
->discipline
||
2141 !base
->discipline
->fill_geometry
)
2144 base
->discipline
->fill_geometry(block
, geo
);
2145 geo
->start
= get_start_sect(bdev
) >> block
->s2b_shift
;
2149 struct block_device_operations
2150 dasd_device_operations
= {
2151 .owner
= THIS_MODULE
,
2153 .release
= dasd_release
,
2154 .ioctl
= dasd_ioctl
,
2155 .compat_ioctl
= dasd_ioctl
,
2156 .getgeo
= dasd_getgeo
,
2159 /*******************************************************************************
2160 * end of block device operations
2166 #ifdef CONFIG_PROC_FS
2170 if (dasd_page_cache
!= NULL
) {
2171 kmem_cache_destroy(dasd_page_cache
);
2172 dasd_page_cache
= NULL
;
2174 dasd_gendisk_exit();
2176 if (dasd_debug_area
!= NULL
) {
2177 debug_unregister(dasd_debug_area
);
2178 dasd_debug_area
= NULL
;
2183 * SECTION: common functions for ccw_driver use
2186 static void dasd_generic_auto_online(void *data
, async_cookie_t cookie
)
2188 struct ccw_device
*cdev
= data
;
2191 ret
= ccw_device_set_online(cdev
);
2193 pr_warning("%s: Setting the DASD online failed with rc=%d\n",
2194 dev_name(&cdev
->dev
), ret
);
2196 struct dasd_device
*device
= dasd_device_from_cdev(cdev
);
2197 wait_event(dasd_init_waitq
, _wait_for_device(device
));
2198 dasd_put_device(device
);
2203 * Initial attempt at a probe function. this can be simplified once
2204 * the other detection code is gone.
2206 int dasd_generic_probe(struct ccw_device
*cdev
,
2207 struct dasd_discipline
*discipline
)
2211 ret
= ccw_device_set_options(cdev
, CCWDEV_DO_PATHGROUP
);
2213 DBF_EVENT(DBF_WARNING
,
2214 "dasd_generic_probe: could not set ccw-device options "
2215 "for %s\n", dev_name(&cdev
->dev
));
2218 ret
= dasd_add_sysfs_files(cdev
);
2220 DBF_EVENT(DBF_WARNING
,
2221 "dasd_generic_probe: could not add sysfs entries "
2222 "for %s\n", dev_name(&cdev
->dev
));
2225 cdev
->handler
= &dasd_int_handler
;
2228 * Automatically online either all dasd devices (dasd_autodetect)
2229 * or all devices specified with dasd= parameters during
2232 if ((dasd_get_feature(cdev
, DASD_FEATURE_INITIAL_ONLINE
) > 0 ) ||
2233 (dasd_autodetect
&& dasd_busid_known(dev_name(&cdev
->dev
)) != 0))
2234 async_schedule(dasd_generic_auto_online
, cdev
);
2239 * This will one day be called from a global not_oper handler.
2240 * It is also used by driver_unregister during module unload.
2242 void dasd_generic_remove(struct ccw_device
*cdev
)
2244 struct dasd_device
*device
;
2245 struct dasd_block
*block
;
2247 cdev
->handler
= NULL
;
2249 dasd_remove_sysfs_files(cdev
);
2250 device
= dasd_device_from_cdev(cdev
);
2253 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
2254 /* Already doing offline processing */
2255 dasd_put_device(device
);
2259 * This device is removed unconditionally. Set offline
2260 * flag to prevent dasd_open from opening it while it is
2261 * no quite down yet.
2263 dasd_set_target_state(device
, DASD_STATE_NEW
);
2264 /* dasd_delete_device destroys the device reference. */
2265 block
= device
->block
;
2266 device
->block
= NULL
;
2267 dasd_delete_device(device
);
2269 * life cycle of block is bound to device, so delete it after
2270 * device was safely removed
2273 dasd_free_block(block
);
2277 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
2278 * the device is detected for the first time and is supposed to be used
2279 * or the user has started activation through sysfs.
2281 int dasd_generic_set_online(struct ccw_device
*cdev
,
2282 struct dasd_discipline
*base_discipline
)
2284 struct dasd_discipline
*discipline
;
2285 struct dasd_device
*device
;
2288 /* first online clears initial online feature flag */
2289 dasd_set_feature(cdev
, DASD_FEATURE_INITIAL_ONLINE
, 0);
2290 device
= dasd_create_device(cdev
);
2292 return PTR_ERR(device
);
2294 discipline
= base_discipline
;
2295 if (device
->features
& DASD_FEATURE_USEDIAG
) {
2296 if (!dasd_diag_discipline_pointer
) {
2297 pr_warning("%s Setting the DASD online failed because "
2298 "of missing DIAG discipline\n",
2299 dev_name(&cdev
->dev
));
2300 dasd_delete_device(device
);
2303 discipline
= dasd_diag_discipline_pointer
;
2305 if (!try_module_get(base_discipline
->owner
)) {
2306 dasd_delete_device(device
);
2309 if (!try_module_get(discipline
->owner
)) {
2310 module_put(base_discipline
->owner
);
2311 dasd_delete_device(device
);
2314 device
->base_discipline
= base_discipline
;
2315 device
->discipline
= discipline
;
2317 /* check_device will allocate block device if necessary */
2318 rc
= discipline
->check_device(device
);
2320 pr_warning("%s Setting the DASD online with discipline %s "
2321 "failed with rc=%i\n",
2322 dev_name(&cdev
->dev
), discipline
->name
, rc
);
2323 module_put(discipline
->owner
);
2324 module_put(base_discipline
->owner
);
2325 dasd_delete_device(device
);
2329 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
2330 if (device
->state
<= DASD_STATE_KNOWN
) {
2331 pr_warning("%s Setting the DASD online failed because of a "
2332 "missing discipline\n", dev_name(&cdev
->dev
));
2334 dasd_set_target_state(device
, DASD_STATE_NEW
);
2336 dasd_free_block(device
->block
);
2337 dasd_delete_device(device
);
2339 pr_debug("dasd_generic device %s found\n",
2340 dev_name(&cdev
->dev
));
2341 dasd_put_device(device
);
2345 int dasd_generic_set_offline(struct ccw_device
*cdev
)
2347 struct dasd_device
*device
;
2348 struct dasd_block
*block
;
2349 int max_count
, open_count
;
2351 device
= dasd_device_from_cdev(cdev
);
2353 return PTR_ERR(device
);
2354 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
2355 /* Already doing offline processing */
2356 dasd_put_device(device
);
2360 * We must make sure that this device is currently not in use.
2361 * The open_count is increased for every opener, that includes
2362 * the blkdev_get in dasd_scan_partitions. We are only interested
2363 * in the other openers.
2365 if (device
->block
) {
2366 max_count
= device
->block
->bdev
? 0 : -1;
2367 open_count
= atomic_read(&device
->block
->open_count
);
2368 if (open_count
> max_count
) {
2370 pr_warning("%s: The DASD cannot be set offline "
2371 "with open count %i\n",
2372 dev_name(&cdev
->dev
), open_count
);
2374 pr_warning("%s: The DASD cannot be set offline "
2375 "while it is in use\n",
2376 dev_name(&cdev
->dev
));
2377 clear_bit(DASD_FLAG_OFFLINE
, &device
->flags
);
2378 dasd_put_device(device
);
2382 dasd_set_target_state(device
, DASD_STATE_NEW
);
2383 /* dasd_delete_device destroys the device reference. */
2384 block
= device
->block
;
2385 device
->block
= NULL
;
2386 dasd_delete_device(device
);
2388 * life cycle of block is bound to device, so delete it after
2389 * device was safely removed
2392 dasd_free_block(block
);
2396 int dasd_generic_notify(struct ccw_device
*cdev
, int event
)
2398 struct dasd_device
*device
;
2399 struct dasd_ccw_req
*cqr
;
2402 device
= dasd_device_from_cdev_locked(cdev
);
2410 /* First of all call extended error reporting. */
2411 dasd_eer_write(device
, NULL
, DASD_EER_NOPATH
);
2413 if (device
->state
< DASD_STATE_BASIC
)
2415 /* Device is active. We want to keep it. */
2416 list_for_each_entry(cqr
, &device
->ccw_queue
, devlist
)
2417 if (cqr
->status
== DASD_CQR_IN_IO
) {
2418 cqr
->status
= DASD_CQR_QUEUED
;
2421 device
->stopped
|= DASD_STOPPED_DC_WAIT
;
2422 dasd_device_clear_timer(device
);
2423 dasd_schedule_device_bh(device
);
2427 /* FIXME: add a sanity check. */
2428 device
->stopped
&= ~DASD_STOPPED_DC_WAIT
;
2429 if (device
->stopped
& DASD_UNRESUMED_PM
) {
2430 device
->stopped
&= ~DASD_UNRESUMED_PM
;
2431 dasd_restore_device(device
);
2435 dasd_schedule_device_bh(device
);
2437 dasd_schedule_block_bh(device
->block
);
2441 dasd_put_device(device
);
2445 int dasd_generic_pm_freeze(struct ccw_device
*cdev
)
2447 struct dasd_ccw_req
*cqr
, *n
;
2449 struct list_head freeze_queue
;
2450 struct dasd_device
*device
= dasd_device_from_cdev(cdev
);
2453 return PTR_ERR(device
);
2454 /* disallow new I/O */
2455 device
->stopped
|= DASD_STOPPED_PM
;
2456 /* clear active requests */
2457 INIT_LIST_HEAD(&freeze_queue
);
2458 spin_lock_irq(get_ccwdev_lock(cdev
));
2460 list_for_each_entry_safe(cqr
, n
, &device
->ccw_queue
, devlist
) {
2461 /* Check status and move request to flush_queue */
2462 if (cqr
->status
== DASD_CQR_IN_IO
) {
2463 rc
= device
->discipline
->term_IO(cqr
);
2465 /* unable to terminate requeust */
2466 dev_err(&device
->cdev
->dev
,
2467 "Unable to terminate request %p "
2468 "on suspend\n", cqr
);
2469 spin_unlock_irq(get_ccwdev_lock(cdev
));
2470 dasd_put_device(device
);
2474 list_move_tail(&cqr
->devlist
, &freeze_queue
);
2477 spin_unlock_irq(get_ccwdev_lock(cdev
));
2479 list_for_each_entry_safe(cqr
, n
, &freeze_queue
, devlist
) {
2480 wait_event(dasd_flush_wq
,
2481 (cqr
->status
!= DASD_CQR_CLEAR_PENDING
));
2482 if (cqr
->status
== DASD_CQR_CLEARED
)
2483 cqr
->status
= DASD_CQR_QUEUED
;
2485 /* move freeze_queue to start of the ccw_queue */
2486 spin_lock_irq(get_ccwdev_lock(cdev
));
2487 list_splice_tail(&freeze_queue
, &device
->ccw_queue
);
2488 spin_unlock_irq(get_ccwdev_lock(cdev
));
2490 if (device
->discipline
->freeze
)
2491 rc
= device
->discipline
->freeze(device
);
2493 dasd_put_device(device
);
2496 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze
);
2498 int dasd_generic_restore_device(struct ccw_device
*cdev
)
2500 struct dasd_device
*device
= dasd_device_from_cdev(cdev
);
2504 return PTR_ERR(device
);
2506 dasd_schedule_device_bh(device
);
2508 dasd_schedule_block_bh(device
->block
);
2510 if (device
->discipline
->restore
)
2511 rc
= device
->discipline
->restore(device
);
2513 dasd_put_device(device
);
2516 EXPORT_SYMBOL_GPL(dasd_generic_restore_device
);
2518 static struct dasd_ccw_req
*dasd_generic_build_rdc(struct dasd_device
*device
,
2520 int rdc_buffer_size
,
2523 struct dasd_ccw_req
*cqr
;
2526 cqr
= dasd_smalloc_request(magic
, 1 /* RDC */, rdc_buffer_size
, device
);
2529 /* internal error 13 - Allocating the RDC request failed*/
2530 dev_err(&device
->cdev
->dev
,
2531 "An error occurred in the DASD device driver, "
2532 "reason=%s\n", "13");
2537 ccw
->cmd_code
= CCW_CMD_RDC
;
2538 ccw
->cda
= (__u32
)(addr_t
)rdc_buffer
;
2539 ccw
->count
= rdc_buffer_size
;
2541 cqr
->startdev
= device
;
2542 cqr
->memdev
= device
;
2543 cqr
->expires
= 10*HZ
;
2544 clear_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
2546 cqr
->buildclk
= get_clock();
2547 cqr
->status
= DASD_CQR_FILLED
;
2552 int dasd_generic_read_dev_chars(struct dasd_device
*device
, char *magic
,
2553 void *rdc_buffer
, int rdc_buffer_size
)
2556 struct dasd_ccw_req
*cqr
;
2558 cqr
= dasd_generic_build_rdc(device
, rdc_buffer
, rdc_buffer_size
,
2561 return PTR_ERR(cqr
);
2563 ret
= dasd_sleep_on(cqr
);
2564 dasd_sfree_request(cqr
, cqr
->memdev
);
2567 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars
);
2570 * In command mode and transport mode we need to look for sense
2571 * data in different places. The sense data itself is allways
2572 * an array of 32 bytes, so we can unify the sense data access
2575 char *dasd_get_sense(struct irb
*irb
)
2577 struct tsb
*tsb
= NULL
;
2580 if (scsw_is_tm(&irb
->scsw
) && (irb
->scsw
.tm
.fcxs
== 0x01)) {
2581 if (irb
->scsw
.tm
.tcw
)
2582 tsb
= tcw_get_tsb((struct tcw
*)(unsigned long)
2584 if (tsb
&& tsb
->length
== 64 && tsb
->flags
)
2585 switch (tsb
->flags
& 0x07) {
2586 case 1: /* tsa_iostat */
2587 sense
= tsb
->tsa
.iostat
.sense
;
2589 case 2: /* tsa_ddpc */
2590 sense
= tsb
->tsa
.ddpc
.sense
;
2593 /* currently we don't use interrogate data */
2596 } else if (irb
->esw
.esw0
.erw
.cons
) {
2601 EXPORT_SYMBOL_GPL(dasd_get_sense
);
2603 static int __init
dasd_init(void)
2607 init_waitqueue_head(&dasd_init_waitq
);
2608 init_waitqueue_head(&dasd_flush_wq
);
2609 init_waitqueue_head(&generic_waitq
);
2611 /* register 'common' DASD debug area, used for all DBF_XXX calls */
2612 dasd_debug_area
= debug_register("dasd", 1, 1, 8 * sizeof(long));
2613 if (dasd_debug_area
== NULL
) {
2617 debug_register_view(dasd_debug_area
, &debug_sprintf_view
);
2618 debug_set_level(dasd_debug_area
, DBF_WARNING
);
2620 DBF_EVENT(DBF_EMERG
, "%s", "debug area created");
2622 dasd_diag_discipline_pointer
= NULL
;
2624 rc
= dasd_devmap_init();
2627 rc
= dasd_gendisk_init();
2633 rc
= dasd_eer_init();
2636 #ifdef CONFIG_PROC_FS
2637 rc
= dasd_proc_init();
2644 pr_info("The DASD device driver could not be initialized\n");
2649 module_init(dasd_init
);
2650 module_exit(dasd_exit
);
2652 EXPORT_SYMBOL(dasd_debug_area
);
2653 EXPORT_SYMBOL(dasd_diag_discipline_pointer
);
2655 EXPORT_SYMBOL(dasd_add_request_head
);
2656 EXPORT_SYMBOL(dasd_add_request_tail
);
2657 EXPORT_SYMBOL(dasd_cancel_req
);
2658 EXPORT_SYMBOL(dasd_device_clear_timer
);
2659 EXPORT_SYMBOL(dasd_block_clear_timer
);
2660 EXPORT_SYMBOL(dasd_enable_device
);
2661 EXPORT_SYMBOL(dasd_int_handler
);
2662 EXPORT_SYMBOL(dasd_kfree_request
);
2663 EXPORT_SYMBOL(dasd_kick_device
);
2664 EXPORT_SYMBOL(dasd_kmalloc_request
);
2665 EXPORT_SYMBOL(dasd_schedule_device_bh
);
2666 EXPORT_SYMBOL(dasd_schedule_block_bh
);
2667 EXPORT_SYMBOL(dasd_set_target_state
);
2668 EXPORT_SYMBOL(dasd_device_set_timer
);
2669 EXPORT_SYMBOL(dasd_block_set_timer
);
2670 EXPORT_SYMBOL(dasd_sfree_request
);
2671 EXPORT_SYMBOL(dasd_sleep_on
);
2672 EXPORT_SYMBOL(dasd_sleep_on_immediatly
);
2673 EXPORT_SYMBOL(dasd_sleep_on_interruptible
);
2674 EXPORT_SYMBOL(dasd_smalloc_request
);
2675 EXPORT_SYMBOL(dasd_start_IO
);
2676 EXPORT_SYMBOL(dasd_term_IO
);
2678 EXPORT_SYMBOL_GPL(dasd_generic_probe
);
2679 EXPORT_SYMBOL_GPL(dasd_generic_remove
);
2680 EXPORT_SYMBOL_GPL(dasd_generic_notify
);
2681 EXPORT_SYMBOL_GPL(dasd_generic_set_online
);
2682 EXPORT_SYMBOL_GPL(dasd_generic_set_offline
);
2683 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change
);
2684 EXPORT_SYMBOL_GPL(dasd_flush_device_queue
);
2685 EXPORT_SYMBOL_GPL(dasd_alloc_block
);
2686 EXPORT_SYMBOL_GPL(dasd_free_block
);