2 * File...........: linux/drivers/s390/block/dasd.c
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * Copyright IBM Corp. 1999, 2009
11 #define KMSG_COMPONENT "dasd"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14 #include <linux/kmod.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/ctype.h>
18 #include <linux/major.h>
19 #include <linux/slab.h>
20 #include <linux/buffer_head.h>
21 #include <linux/hdreg.h>
22 #include <linux/async.h>
23 #include <linux/mutex.h>
25 #include <asm/ccwdev.h>
26 #include <asm/ebcdic.h>
27 #include <asm/idals.h>
32 #define PRINTK_HEADER "dasd:"
36 * SECTION: Constant definitions to be used within this file
38 #define DASD_CHANQ_MAX_SIZE 4
41 * SECTION: exported variables of dasd.c
43 debug_info_t
*dasd_debug_area
;
44 struct dasd_discipline
*dasd_diag_discipline_pointer
;
45 void dasd_int_handler(struct ccw_device
*, unsigned long, struct irb
*);
47 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
48 MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
49 " Copyright 2000 IBM Corporation");
50 MODULE_SUPPORTED_DEVICE("dasd");
51 MODULE_LICENSE("GPL");
54 * SECTION: prototypes for static functions of dasd.c
56 static int dasd_alloc_queue(struct dasd_block
*);
57 static void dasd_setup_queue(struct dasd_block
*);
58 static void dasd_free_queue(struct dasd_block
*);
59 static void dasd_flush_request_queue(struct dasd_block
*);
60 static int dasd_flush_block_queue(struct dasd_block
*);
61 static void dasd_device_tasklet(struct dasd_device
*);
62 static void dasd_block_tasklet(struct dasd_block
*);
63 static void do_kick_device(struct work_struct
*);
64 static void do_restore_device(struct work_struct
*);
65 static void dasd_return_cqr_cb(struct dasd_ccw_req
*, void *);
66 static void dasd_device_timeout(unsigned long);
67 static void dasd_block_timeout(unsigned long);
68 static void __dasd_process_erp(struct dasd_device
*, struct dasd_ccw_req
*);
71 * SECTION: Operations on the device structure.
73 static wait_queue_head_t dasd_init_waitq
;
74 static wait_queue_head_t dasd_flush_wq
;
75 static wait_queue_head_t generic_waitq
;
78 * Allocate memory for a new device structure.
80 struct dasd_device
*dasd_alloc_device(void)
82 struct dasd_device
*device
;
84 device
= kzalloc(sizeof(struct dasd_device
), GFP_ATOMIC
);
86 return ERR_PTR(-ENOMEM
);
88 /* Get two pages for normal block device operations. */
89 device
->ccw_mem
= (void *) __get_free_pages(GFP_ATOMIC
| GFP_DMA
, 1);
90 if (!device
->ccw_mem
) {
92 return ERR_PTR(-ENOMEM
);
94 /* Get one page for error recovery. */
95 device
->erp_mem
= (void *) get_zeroed_page(GFP_ATOMIC
| GFP_DMA
);
96 if (!device
->erp_mem
) {
97 free_pages((unsigned long) device
->ccw_mem
, 1);
99 return ERR_PTR(-ENOMEM
);
102 dasd_init_chunklist(&device
->ccw_chunks
, device
->ccw_mem
, PAGE_SIZE
*2);
103 dasd_init_chunklist(&device
->erp_chunks
, device
->erp_mem
, PAGE_SIZE
);
104 spin_lock_init(&device
->mem_lock
);
105 atomic_set(&device
->tasklet_scheduled
, 0);
106 tasklet_init(&device
->tasklet
,
107 (void (*)(unsigned long)) dasd_device_tasklet
,
108 (unsigned long) device
);
109 INIT_LIST_HEAD(&device
->ccw_queue
);
110 init_timer(&device
->timer
);
111 device
->timer
.function
= dasd_device_timeout
;
112 device
->timer
.data
= (unsigned long) device
;
113 INIT_WORK(&device
->kick_work
, do_kick_device
);
114 INIT_WORK(&device
->restore_device
, do_restore_device
);
115 device
->state
= DASD_STATE_NEW
;
116 device
->target
= DASD_STATE_NEW
;
117 mutex_init(&device
->state_mutex
);
123 * Free memory of a device structure.
125 void dasd_free_device(struct dasd_device
*device
)
127 kfree(device
->private);
128 free_page((unsigned long) device
->erp_mem
);
129 free_pages((unsigned long) device
->ccw_mem
, 1);
134 * Allocate memory for a new device structure.
136 struct dasd_block
*dasd_alloc_block(void)
138 struct dasd_block
*block
;
140 block
= kzalloc(sizeof(*block
), GFP_ATOMIC
);
142 return ERR_PTR(-ENOMEM
);
143 /* open_count = 0 means device online but not in use */
144 atomic_set(&block
->open_count
, -1);
146 spin_lock_init(&block
->request_queue_lock
);
147 atomic_set(&block
->tasklet_scheduled
, 0);
148 tasklet_init(&block
->tasklet
,
149 (void (*)(unsigned long)) dasd_block_tasklet
,
150 (unsigned long) block
);
151 INIT_LIST_HEAD(&block
->ccw_queue
);
152 spin_lock_init(&block
->queue_lock
);
153 init_timer(&block
->timer
);
154 block
->timer
.function
= dasd_block_timeout
;
155 block
->timer
.data
= (unsigned long) block
;
161 * Free memory of a device structure.
163 void dasd_free_block(struct dasd_block
*block
)
169 * Make a new device known to the system.
171 static int dasd_state_new_to_known(struct dasd_device
*device
)
176 * As long as the device is not in state DASD_STATE_NEW we want to
177 * keep the reference count > 0.
179 dasd_get_device(device
);
182 rc
= dasd_alloc_queue(device
->block
);
184 dasd_put_device(device
);
188 device
->state
= DASD_STATE_KNOWN
;
193 * Let the system forget about a device.
195 static int dasd_state_known_to_new(struct dasd_device
*device
)
197 /* Disable extended error reporting for this device. */
198 dasd_eer_disable(device
);
199 /* Forget the discipline information. */
200 if (device
->discipline
) {
201 if (device
->discipline
->uncheck_device
)
202 device
->discipline
->uncheck_device(device
);
203 module_put(device
->discipline
->owner
);
205 device
->discipline
= NULL
;
206 if (device
->base_discipline
)
207 module_put(device
->base_discipline
->owner
);
208 device
->base_discipline
= NULL
;
209 device
->state
= DASD_STATE_NEW
;
212 dasd_free_queue(device
->block
);
214 /* Give up reference we took in dasd_state_new_to_known. */
215 dasd_put_device(device
);
220 * Request the irq line for the device.
222 static int dasd_state_known_to_basic(struct dasd_device
*device
)
226 /* Allocate and register gendisk structure. */
228 rc
= dasd_gendisk_alloc(device
->block
);
232 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
233 device
->debug_area
= debug_register(dev_name(&device
->cdev
->dev
), 4, 1,
235 debug_register_view(device
->debug_area
, &debug_sprintf_view
);
236 debug_set_level(device
->debug_area
, DBF_WARNING
);
237 DBF_DEV_EVENT(DBF_EMERG
, device
, "%s", "debug area created");
239 device
->state
= DASD_STATE_BASIC
;
244 * Release the irq line for the device. Terminate any running i/o.
246 static int dasd_state_basic_to_known(struct dasd_device
*device
)
250 dasd_gendisk_free(device
->block
);
251 dasd_block_clear_timer(device
->block
);
253 rc
= dasd_flush_device_queue(device
);
256 dasd_device_clear_timer(device
);
258 DBF_DEV_EVENT(DBF_EMERG
, device
, "%p debug area deleted", device
);
259 if (device
->debug_area
!= NULL
) {
260 debug_unregister(device
->debug_area
);
261 device
->debug_area
= NULL
;
263 device
->state
= DASD_STATE_KNOWN
;
268 * Do the initial analysis. The do_analysis function may return
269 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
270 * until the discipline decides to continue the startup sequence
271 * by calling the function dasd_change_state. The eckd disciplines
272 * uses this to start a ccw that detects the format. The completion
273 * interrupt for this detection ccw uses the kernel event daemon to
274 * trigger the call to dasd_change_state. All this is done in the
275 * discipline code, see dasd_eckd.c.
276 * After the analysis ccw is done (do_analysis returned 0) the block
278 * In case the analysis returns an error, the device setup is stopped
279 * (a fake disk was already added to allow formatting).
281 static int dasd_state_basic_to_ready(struct dasd_device
*device
)
284 struct dasd_block
*block
;
287 block
= device
->block
;
288 /* make disk known with correct capacity */
290 if (block
->base
->discipline
->do_analysis
!= NULL
)
291 rc
= block
->base
->discipline
->do_analysis(block
);
294 device
->state
= DASD_STATE_UNFMT
;
297 dasd_setup_queue(block
);
298 set_capacity(block
->gdp
,
299 block
->blocks
<< block
->s2b_shift
);
300 device
->state
= DASD_STATE_READY
;
301 rc
= dasd_scan_partitions(block
);
303 device
->state
= DASD_STATE_BASIC
;
305 device
->state
= DASD_STATE_READY
;
311 * Remove device from block device layer. Destroy dirty buffers.
312 * Forget format information. Check if the target level is basic
313 * and if it is create fake disk for formatting.
315 static int dasd_state_ready_to_basic(struct dasd_device
*device
)
319 device
->state
= DASD_STATE_BASIC
;
321 struct dasd_block
*block
= device
->block
;
322 rc
= dasd_flush_block_queue(block
);
324 device
->state
= DASD_STATE_READY
;
327 dasd_flush_request_queue(block
);
328 dasd_destroy_partitions(block
);
331 block
->s2b_shift
= 0;
339 static int dasd_state_unfmt_to_basic(struct dasd_device
*device
)
341 device
->state
= DASD_STATE_BASIC
;
346 * Make the device online and schedule the bottom half to start
347 * the requeueing of requests from the linux request queue to the
351 dasd_state_ready_to_online(struct dasd_device
* device
)
354 struct gendisk
*disk
;
355 struct disk_part_iter piter
;
356 struct hd_struct
*part
;
358 if (device
->discipline
->ready_to_online
) {
359 rc
= device
->discipline
->ready_to_online(device
);
363 device
->state
= DASD_STATE_ONLINE
;
365 dasd_schedule_block_bh(device
->block
);
366 disk
= device
->block
->bdev
->bd_disk
;
367 disk_part_iter_init(&piter
, disk
, DISK_PITER_INCL_PART0
);
368 while ((part
= disk_part_iter_next(&piter
)))
369 kobject_uevent(&part_to_dev(part
)->kobj
, KOBJ_CHANGE
);
370 disk_part_iter_exit(&piter
);
376 * Stop the requeueing of requests again.
378 static int dasd_state_online_to_ready(struct dasd_device
*device
)
381 struct gendisk
*disk
;
382 struct disk_part_iter piter
;
383 struct hd_struct
*part
;
385 if (device
->discipline
->online_to_ready
) {
386 rc
= device
->discipline
->online_to_ready(device
);
390 device
->state
= DASD_STATE_READY
;
392 disk
= device
->block
->bdev
->bd_disk
;
393 disk_part_iter_init(&piter
, disk
, DISK_PITER_INCL_PART0
);
394 while ((part
= disk_part_iter_next(&piter
)))
395 kobject_uevent(&part_to_dev(part
)->kobj
, KOBJ_CHANGE
);
396 disk_part_iter_exit(&piter
);
402 * Device startup state changes.
404 static int dasd_increase_state(struct dasd_device
*device
)
409 if (device
->state
== DASD_STATE_NEW
&&
410 device
->target
>= DASD_STATE_KNOWN
)
411 rc
= dasd_state_new_to_known(device
);
414 device
->state
== DASD_STATE_KNOWN
&&
415 device
->target
>= DASD_STATE_BASIC
)
416 rc
= dasd_state_known_to_basic(device
);
419 device
->state
== DASD_STATE_BASIC
&&
420 device
->target
>= DASD_STATE_READY
)
421 rc
= dasd_state_basic_to_ready(device
);
424 device
->state
== DASD_STATE_UNFMT
&&
425 device
->target
> DASD_STATE_UNFMT
)
429 device
->state
== DASD_STATE_READY
&&
430 device
->target
>= DASD_STATE_ONLINE
)
431 rc
= dasd_state_ready_to_online(device
);
437 * Device shutdown state changes.
439 static int dasd_decrease_state(struct dasd_device
*device
)
444 if (device
->state
== DASD_STATE_ONLINE
&&
445 device
->target
<= DASD_STATE_READY
)
446 rc
= dasd_state_online_to_ready(device
);
449 device
->state
== DASD_STATE_READY
&&
450 device
->target
<= DASD_STATE_BASIC
)
451 rc
= dasd_state_ready_to_basic(device
);
454 device
->state
== DASD_STATE_UNFMT
&&
455 device
->target
<= DASD_STATE_BASIC
)
456 rc
= dasd_state_unfmt_to_basic(device
);
459 device
->state
== DASD_STATE_BASIC
&&
460 device
->target
<= DASD_STATE_KNOWN
)
461 rc
= dasd_state_basic_to_known(device
);
464 device
->state
== DASD_STATE_KNOWN
&&
465 device
->target
<= DASD_STATE_NEW
)
466 rc
= dasd_state_known_to_new(device
);
472 * This is the main startup/shutdown routine.
474 static void dasd_change_state(struct dasd_device
*device
)
478 if (device
->state
== device
->target
)
479 /* Already where we want to go today... */
481 if (device
->state
< device
->target
)
482 rc
= dasd_increase_state(device
);
484 rc
= dasd_decrease_state(device
);
488 device
->target
= device
->state
;
490 if (device
->state
== device
->target
)
491 wake_up(&dasd_init_waitq
);
493 /* let user-space know that the device status changed */
494 kobject_uevent(&device
->cdev
->dev
.kobj
, KOBJ_CHANGE
);
498 * Kick starter for devices that did not complete the startup/shutdown
499 * procedure or were sleeping because of a pending state.
500 * dasd_kick_device will schedule a call do do_kick_device to the kernel
503 static void do_kick_device(struct work_struct
*work
)
505 struct dasd_device
*device
= container_of(work
, struct dasd_device
, kick_work
);
506 mutex_lock(&device
->state_mutex
);
507 dasd_change_state(device
);
508 mutex_unlock(&device
->state_mutex
);
509 dasd_schedule_device_bh(device
);
510 dasd_put_device(device
);
513 void dasd_kick_device(struct dasd_device
*device
)
515 dasd_get_device(device
);
516 /* queue call to dasd_kick_device to the kernel event daemon. */
517 schedule_work(&device
->kick_work
);
521 * dasd_restore_device will schedule a call do do_restore_device to the kernel
524 static void do_restore_device(struct work_struct
*work
)
526 struct dasd_device
*device
= container_of(work
, struct dasd_device
,
528 device
->cdev
->drv
->restore(device
->cdev
);
529 dasd_put_device(device
);
532 void dasd_restore_device(struct dasd_device
*device
)
534 dasd_get_device(device
);
535 /* queue call to dasd_restore_device to the kernel event daemon. */
536 schedule_work(&device
->restore_device
);
540 * Set the target state for a device and starts the state change.
542 void dasd_set_target_state(struct dasd_device
*device
, int target
)
544 dasd_get_device(device
);
545 mutex_lock(&device
->state_mutex
);
546 /* If we are in probeonly mode stop at DASD_STATE_READY. */
547 if (dasd_probeonly
&& target
> DASD_STATE_READY
)
548 target
= DASD_STATE_READY
;
549 if (device
->target
!= target
) {
550 if (device
->state
== target
)
551 wake_up(&dasd_init_waitq
);
552 device
->target
= target
;
554 if (device
->state
!= device
->target
)
555 dasd_change_state(device
);
556 mutex_unlock(&device
->state_mutex
);
557 dasd_put_device(device
);
561 * Enable devices with device numbers in [from..to].
563 static inline int _wait_for_device(struct dasd_device
*device
)
565 return (device
->state
== device
->target
);
568 void dasd_enable_device(struct dasd_device
*device
)
570 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
571 if (device
->state
<= DASD_STATE_KNOWN
)
572 /* No discipline for device found. */
573 dasd_set_target_state(device
, DASD_STATE_NEW
);
574 /* Now wait for the devices to come up. */
575 wait_event(dasd_init_waitq
, _wait_for_device(device
));
579 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
581 #ifdef CONFIG_DASD_PROFILE
583 struct dasd_profile_info_t dasd_global_profile
;
584 unsigned int dasd_profile_level
= DASD_PROFILE_OFF
;
587 * Increments counter in global and local profiling structures.
589 #define dasd_profile_counter(value, counter, block) \
592 for (index = 0; index < 31 && value >> (2+index); index++); \
593 dasd_global_profile.counter[index]++; \
594 block->profile.counter[index]++; \
598 * Add profiling information for cqr before execution.
600 static void dasd_profile_start(struct dasd_block
*block
,
601 struct dasd_ccw_req
*cqr
,
605 unsigned int counter
;
607 if (dasd_profile_level
!= DASD_PROFILE_ON
)
610 /* count the length of the chanq for statistics */
612 list_for_each(l
, &block
->ccw_queue
)
615 dasd_global_profile
.dasd_io_nr_req
[counter
]++;
616 block
->profile
.dasd_io_nr_req
[counter
]++;
620 * Add profiling information for cqr after execution.
622 static void dasd_profile_end(struct dasd_block
*block
,
623 struct dasd_ccw_req
*cqr
,
626 long strtime
, irqtime
, endtime
, tottime
; /* in microseconds */
627 long tottimeps
, sectors
;
629 if (dasd_profile_level
!= DASD_PROFILE_ON
)
632 sectors
= blk_rq_sectors(req
);
633 if (!cqr
->buildclk
|| !cqr
->startclk
||
634 !cqr
->stopclk
|| !cqr
->endclk
||
638 strtime
= ((cqr
->startclk
- cqr
->buildclk
) >> 12);
639 irqtime
= ((cqr
->stopclk
- cqr
->startclk
) >> 12);
640 endtime
= ((cqr
->endclk
- cqr
->stopclk
) >> 12);
641 tottime
= ((cqr
->endclk
- cqr
->buildclk
) >> 12);
642 tottimeps
= tottime
/ sectors
;
644 if (!dasd_global_profile
.dasd_io_reqs
)
645 memset(&dasd_global_profile
, 0,
646 sizeof(struct dasd_profile_info_t
));
647 dasd_global_profile
.dasd_io_reqs
++;
648 dasd_global_profile
.dasd_io_sects
+= sectors
;
650 if (!block
->profile
.dasd_io_reqs
)
651 memset(&block
->profile
, 0,
652 sizeof(struct dasd_profile_info_t
));
653 block
->profile
.dasd_io_reqs
++;
654 block
->profile
.dasd_io_sects
+= sectors
;
656 dasd_profile_counter(sectors
, dasd_io_secs
, block
);
657 dasd_profile_counter(tottime
, dasd_io_times
, block
);
658 dasd_profile_counter(tottimeps
, dasd_io_timps
, block
);
659 dasd_profile_counter(strtime
, dasd_io_time1
, block
);
660 dasd_profile_counter(irqtime
, dasd_io_time2
, block
);
661 dasd_profile_counter(irqtime
/ sectors
, dasd_io_time2ps
, block
);
662 dasd_profile_counter(endtime
, dasd_io_time3
, block
);
665 #define dasd_profile_start(block, cqr, req) do {} while (0)
666 #define dasd_profile_end(block, cqr, req) do {} while (0)
667 #endif /* CONFIG_DASD_PROFILE */
670 * Allocate memory for a channel program with 'cplength' channel
671 * command words and 'datasize' additional space. There are two
672 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
673 * memory and 2) dasd_smalloc_request uses the static ccw memory
674 * that gets allocated for each device.
676 struct dasd_ccw_req
*dasd_kmalloc_request(int magic
, int cplength
,
678 struct dasd_device
*device
)
680 struct dasd_ccw_req
*cqr
;
683 BUG_ON(datasize
> PAGE_SIZE
||
684 (cplength
*sizeof(struct ccw1
)) > PAGE_SIZE
);
686 cqr
= kzalloc(sizeof(struct dasd_ccw_req
), GFP_ATOMIC
);
688 return ERR_PTR(-ENOMEM
);
691 cqr
->cpaddr
= kcalloc(cplength
, sizeof(struct ccw1
),
692 GFP_ATOMIC
| GFP_DMA
);
693 if (cqr
->cpaddr
== NULL
) {
695 return ERR_PTR(-ENOMEM
);
700 cqr
->data
= kzalloc(datasize
, GFP_ATOMIC
| GFP_DMA
);
701 if (cqr
->data
== NULL
) {
704 return ERR_PTR(-ENOMEM
);
708 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
709 dasd_get_device(device
);
713 struct dasd_ccw_req
*dasd_smalloc_request(int magic
, int cplength
,
715 struct dasd_device
*device
)
718 struct dasd_ccw_req
*cqr
;
723 BUG_ON(datasize
> PAGE_SIZE
||
724 (cplength
*sizeof(struct ccw1
)) > PAGE_SIZE
);
726 size
= (sizeof(struct dasd_ccw_req
) + 7L) & -8L;
728 size
+= cplength
* sizeof(struct ccw1
);
731 spin_lock_irqsave(&device
->mem_lock
, flags
);
732 cqr
= (struct dasd_ccw_req
*)
733 dasd_alloc_chunk(&device
->ccw_chunks
, size
);
734 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
736 return ERR_PTR(-ENOMEM
);
737 memset(cqr
, 0, sizeof(struct dasd_ccw_req
));
738 data
= (char *) cqr
+ ((sizeof(struct dasd_ccw_req
) + 7L) & -8L);
741 cqr
->cpaddr
= (struct ccw1
*) data
;
742 data
+= cplength
*sizeof(struct ccw1
);
743 memset(cqr
->cpaddr
, 0, cplength
*sizeof(struct ccw1
));
748 memset(cqr
->data
, 0, datasize
);
751 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
752 dasd_get_device(device
);
757 * Free memory of a channel program. This function needs to free all the
758 * idal lists that might have been created by dasd_set_cda and the
759 * struct dasd_ccw_req itself.
761 void dasd_kfree_request(struct dasd_ccw_req
*cqr
, struct dasd_device
*device
)
766 /* Clear any idals used for the request. */
769 clear_normalized_cda(ccw
);
770 } while (ccw
++->flags
& (CCW_FLAG_CC
| CCW_FLAG_DC
));
775 dasd_put_device(device
);
778 void dasd_sfree_request(struct dasd_ccw_req
*cqr
, struct dasd_device
*device
)
782 spin_lock_irqsave(&device
->mem_lock
, flags
);
783 dasd_free_chunk(&device
->ccw_chunks
, cqr
);
784 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
785 dasd_put_device(device
);
789 * Check discipline magic in cqr.
791 static inline int dasd_check_cqr(struct dasd_ccw_req
*cqr
)
793 struct dasd_device
*device
;
797 device
= cqr
->startdev
;
798 if (strncmp((char *) &cqr
->magic
, device
->discipline
->ebcname
, 4)) {
799 DBF_DEV_EVENT(DBF_WARNING
, device
,
800 " dasd_ccw_req 0x%08x magic doesn't match"
801 " discipline 0x%08x",
803 *(unsigned int *) device
->discipline
->name
);
810 * Terminate the current i/o and set the request to clear_pending.
811 * Timer keeps device runnig.
812 * ccw_device_clear can fail if the i/o subsystem
815 int dasd_term_IO(struct dasd_ccw_req
*cqr
)
817 struct dasd_device
*device
;
819 char errorstring
[ERRORLENGTH
];
822 rc
= dasd_check_cqr(cqr
);
826 device
= (struct dasd_device
*) cqr
->startdev
;
827 while ((retries
< 5) && (cqr
->status
== DASD_CQR_IN_IO
)) {
828 rc
= ccw_device_clear(device
->cdev
, (long) cqr
);
830 case 0: /* termination successful */
832 cqr
->status
= DASD_CQR_CLEAR_PENDING
;
833 cqr
->stopclk
= get_clock();
835 DBF_DEV_EVENT(DBF_DEBUG
, device
,
836 "terminate cqr %p successful",
840 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
841 "device gone, retry");
844 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
849 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
850 "device busy, retry later");
853 /* internal error 10 - unknown rc*/
854 snprintf(errorstring
, ERRORLENGTH
, "10 %d", rc
);
855 dev_err(&device
->cdev
->dev
, "An error occurred in the "
856 "DASD device driver, reason=%s\n", errorstring
);
862 dasd_schedule_device_bh(device
);
867 * Start the i/o. This start_IO can fail if the channel is really busy.
868 * In that case set up a timer to start the request later.
870 int dasd_start_IO(struct dasd_ccw_req
*cqr
)
872 struct dasd_device
*device
;
874 char errorstring
[ERRORLENGTH
];
877 rc
= dasd_check_cqr(cqr
);
882 device
= (struct dasd_device
*) cqr
->startdev
;
883 if (cqr
->retries
< 0) {
884 /* internal error 14 - start_IO run out of retries */
885 sprintf(errorstring
, "14 %p", cqr
);
886 dev_err(&device
->cdev
->dev
, "An error occurred in the DASD "
887 "device driver, reason=%s\n", errorstring
);
888 cqr
->status
= DASD_CQR_ERROR
;
891 cqr
->startclk
= get_clock();
892 cqr
->starttime
= jiffies
;
894 if (cqr
->cpmode
== 1) {
895 rc
= ccw_device_tm_start(device
->cdev
, cqr
->cpaddr
,
896 (long) cqr
, cqr
->lpm
);
898 rc
= ccw_device_start(device
->cdev
, cqr
->cpaddr
,
899 (long) cqr
, cqr
->lpm
, 0);
903 cqr
->status
= DASD_CQR_IN_IO
;
906 DBF_DEV_EVENT(DBF_DEBUG
, device
, "%s",
907 "start_IO: device busy, retry later");
910 DBF_DEV_EVENT(DBF_DEBUG
, device
, "%s",
911 "start_IO: request timeout, retry later");
914 /* -EACCES indicates that the request used only a
915 * subset of the available pathes and all these
917 * Do a retry with all available pathes.
919 cqr
->lpm
= LPM_ANYPATH
;
920 DBF_DEV_EVENT(DBF_DEBUG
, device
, "%s",
921 "start_IO: selected pathes gone,"
922 " retry on all pathes");
925 DBF_DEV_EVENT(DBF_DEBUG
, device
, "%s",
926 "start_IO: -ENODEV device gone, retry");
929 DBF_DEV_EVENT(DBF_DEBUG
, device
, "%s",
930 "start_IO: -EIO device gone, retry");
933 /* most likely caused in power management context */
934 DBF_DEV_EVENT(DBF_DEBUG
, device
, "%s",
935 "start_IO: -EINVAL device currently "
939 /* internal error 11 - unknown rc */
940 snprintf(errorstring
, ERRORLENGTH
, "11 %d", rc
);
941 dev_err(&device
->cdev
->dev
,
942 "An error occurred in the DASD device driver, "
943 "reason=%s\n", errorstring
);
952 * Timeout function for dasd devices. This is used for different purposes
953 * 1) missing interrupt handler for normal operation
954 * 2) delayed start of request where start_IO failed with -EBUSY
955 * 3) timeout for missing state change interrupts
956 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
957 * DASD_CQR_QUEUED for 2) and 3).
959 static void dasd_device_timeout(unsigned long ptr
)
962 struct dasd_device
*device
;
964 device
= (struct dasd_device
*) ptr
;
965 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
966 /* re-activate request queue */
967 dasd_device_remove_stop_bits(device
, DASD_STOPPED_PENDING
);
968 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
969 dasd_schedule_device_bh(device
);
973 * Setup timeout for a device in jiffies.
975 void dasd_device_set_timer(struct dasd_device
*device
, int expires
)
978 del_timer(&device
->timer
);
980 mod_timer(&device
->timer
, jiffies
+ expires
);
984 * Clear timeout for a device.
986 void dasd_device_clear_timer(struct dasd_device
*device
)
988 del_timer(&device
->timer
);
991 static void dasd_handle_killed_request(struct ccw_device
*cdev
,
992 unsigned long intparm
)
994 struct dasd_ccw_req
*cqr
;
995 struct dasd_device
*device
;
999 cqr
= (struct dasd_ccw_req
*) intparm
;
1000 if (cqr
->status
!= DASD_CQR_IN_IO
) {
1001 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
,
1002 "invalid status in handle_killed_request: "
1003 "%02x", cqr
->status
);
1007 device
= dasd_device_from_cdev_locked(cdev
);
1008 if (IS_ERR(device
)) {
1009 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
, "%s",
1010 "unable to get device from cdev");
1014 if (!cqr
->startdev
||
1015 device
!= cqr
->startdev
||
1016 strncmp(cqr
->startdev
->discipline
->ebcname
,
1017 (char *) &cqr
->magic
, 4)) {
1018 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
, "%s",
1019 "invalid device in request");
1020 dasd_put_device(device
);
1024 /* Schedule request to be retried. */
1025 cqr
->status
= DASD_CQR_QUEUED
;
1027 dasd_device_clear_timer(device
);
1028 dasd_schedule_device_bh(device
);
1029 dasd_put_device(device
);
1032 void dasd_generic_handle_state_change(struct dasd_device
*device
)
1034 /* First of all start sense subsystem status request. */
1035 dasd_eer_snss(device
);
1037 dasd_device_remove_stop_bits(device
, DASD_STOPPED_PENDING
);
1038 dasd_schedule_device_bh(device
);
1040 dasd_schedule_block_bh(device
->block
);
1044 * Interrupt handler for "normal" ssch-io based dasd devices.
1046 void dasd_int_handler(struct ccw_device
*cdev
, unsigned long intparm
,
1049 struct dasd_ccw_req
*cqr
, *next
;
1050 struct dasd_device
*device
;
1051 unsigned long long now
;
1055 switch (PTR_ERR(irb
)) {
1059 DBF_EVENT_DEVID(DBF_WARNING
, cdev
, "%s: "
1060 "request timed out\n", __func__
);
1063 DBF_EVENT_DEVID(DBF_WARNING
, cdev
, "%s: "
1064 "unknown error %ld\n", __func__
,
1067 dasd_handle_killed_request(cdev
, intparm
);
1073 /* check for unsolicited interrupts */
1074 cqr
= (struct dasd_ccw_req
*) intparm
;
1075 if (!cqr
|| ((scsw_cc(&irb
->scsw
) == 1) &&
1076 (scsw_fctl(&irb
->scsw
) & SCSW_FCTL_START_FUNC
) &&
1077 (scsw_stctl(&irb
->scsw
) & SCSW_STCTL_STATUS_PEND
))) {
1078 if (cqr
&& cqr
->status
== DASD_CQR_IN_IO
)
1079 cqr
->status
= DASD_CQR_QUEUED
;
1080 device
= dasd_device_from_cdev_locked(cdev
);
1081 if (!IS_ERR(device
)) {
1082 dasd_device_clear_timer(device
);
1083 device
->discipline
->handle_unsolicited_interrupt(device
,
1085 dasd_put_device(device
);
1090 device
= (struct dasd_device
*) cqr
->startdev
;
1092 strncmp(device
->discipline
->ebcname
, (char *) &cqr
->magic
, 4)) {
1093 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
, "%s",
1094 "invalid device in request");
1098 /* Check for clear pending */
1099 if (cqr
->status
== DASD_CQR_CLEAR_PENDING
&&
1100 scsw_fctl(&irb
->scsw
) & SCSW_FCTL_CLEAR_FUNC
) {
1101 cqr
->status
= DASD_CQR_CLEARED
;
1102 dasd_device_clear_timer(device
);
1103 wake_up(&dasd_flush_wq
);
1104 dasd_schedule_device_bh(device
);
1108 /* check status - the request might have been killed by dyn detach */
1109 if (cqr
->status
!= DASD_CQR_IN_IO
) {
1110 DBF_DEV_EVENT(DBF_DEBUG
, device
, "invalid status: bus_id %s, "
1111 "status %02x", dev_name(&cdev
->dev
), cqr
->status
);
1117 if (scsw_dstat(&irb
->scsw
) == (DEV_STAT_CHN_END
| DEV_STAT_DEV_END
) &&
1118 scsw_cstat(&irb
->scsw
) == 0) {
1119 /* request was completed successfully */
1120 cqr
->status
= DASD_CQR_SUCCESS
;
1122 /* Start first request on queue if possible -> fast_io. */
1123 if (cqr
->devlist
.next
!= &device
->ccw_queue
) {
1124 next
= list_entry(cqr
->devlist
.next
,
1125 struct dasd_ccw_req
, devlist
);
1127 } else { /* error */
1128 memcpy(&cqr
->irb
, irb
, sizeof(struct irb
));
1129 /* log sense for every failed I/O to s390 debugfeature */
1130 dasd_log_sense_dbf(cqr
, irb
);
1131 if (device
->features
& DASD_FEATURE_ERPLOG
) {
1132 dasd_log_sense(cqr
, irb
);
1136 * If we don't want complex ERP for this request, then just
1137 * reset this and retry it in the fastpath
1139 if (!test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
) &&
1141 if (cqr
->lpm
== LPM_ANYPATH
)
1142 DBF_DEV_EVENT(DBF_DEBUG
, device
,
1143 "default ERP in fastpath "
1144 "(%i retries left)",
1146 cqr
->lpm
= LPM_ANYPATH
;
1147 cqr
->status
= DASD_CQR_QUEUED
;
1150 cqr
->status
= DASD_CQR_ERROR
;
1152 if (next
&& (next
->status
== DASD_CQR_QUEUED
) &&
1153 (!device
->stopped
)) {
1154 if (device
->discipline
->start_IO(next
) == 0)
1155 expires
= next
->expires
;
1158 dasd_device_set_timer(device
, expires
);
1160 dasd_device_clear_timer(device
);
1161 dasd_schedule_device_bh(device
);
1165 * If we have an error on a dasd_block layer request then we cancel
1166 * and return all further requests from the same dasd_block as well.
1168 static void __dasd_device_recovery(struct dasd_device
*device
,
1169 struct dasd_ccw_req
*ref_cqr
)
1171 struct list_head
*l
, *n
;
1172 struct dasd_ccw_req
*cqr
;
1175 * only requeue request that came from the dasd_block layer
1177 if (!ref_cqr
->block
)
1180 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1181 cqr
= list_entry(l
, struct dasd_ccw_req
, devlist
);
1182 if (cqr
->status
== DASD_CQR_QUEUED
&&
1183 ref_cqr
->block
== cqr
->block
) {
1184 cqr
->status
= DASD_CQR_CLEARED
;
1190 * Remove those ccw requests from the queue that need to be returned
1191 * to the upper layer.
1193 static void __dasd_device_process_ccw_queue(struct dasd_device
*device
,
1194 struct list_head
*final_queue
)
1196 struct list_head
*l
, *n
;
1197 struct dasd_ccw_req
*cqr
;
1199 /* Process request with final status. */
1200 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1201 cqr
= list_entry(l
, struct dasd_ccw_req
, devlist
);
1203 /* Stop list processing at the first non-final request. */
1204 if (cqr
->status
== DASD_CQR_QUEUED
||
1205 cqr
->status
== DASD_CQR_IN_IO
||
1206 cqr
->status
== DASD_CQR_CLEAR_PENDING
)
1208 if (cqr
->status
== DASD_CQR_ERROR
) {
1209 __dasd_device_recovery(device
, cqr
);
1211 /* Rechain finished requests to final queue */
1212 list_move_tail(&cqr
->devlist
, final_queue
);
1217 * the cqrs from the final queue are returned to the upper layer
1218 * by setting a dasd_block state and calling the callback function
1220 static void __dasd_device_process_final_queue(struct dasd_device
*device
,
1221 struct list_head
*final_queue
)
1223 struct list_head
*l
, *n
;
1224 struct dasd_ccw_req
*cqr
;
1225 struct dasd_block
*block
;
1226 void (*callback
)(struct dasd_ccw_req
*, void *data
);
1227 void *callback_data
;
1228 char errorstring
[ERRORLENGTH
];
1230 list_for_each_safe(l
, n
, final_queue
) {
1231 cqr
= list_entry(l
, struct dasd_ccw_req
, devlist
);
1232 list_del_init(&cqr
->devlist
);
1234 callback
= cqr
->callback
;
1235 callback_data
= cqr
->callback_data
;
1237 spin_lock_bh(&block
->queue_lock
);
1238 switch (cqr
->status
) {
1239 case DASD_CQR_SUCCESS
:
1240 cqr
->status
= DASD_CQR_DONE
;
1242 case DASD_CQR_ERROR
:
1243 cqr
->status
= DASD_CQR_NEED_ERP
;
1245 case DASD_CQR_CLEARED
:
1246 cqr
->status
= DASD_CQR_TERMINATED
;
1249 /* internal error 12 - wrong cqr status*/
1250 snprintf(errorstring
, ERRORLENGTH
, "12 %p %x02", cqr
, cqr
->status
);
1251 dev_err(&device
->cdev
->dev
,
1252 "An error occurred in the DASD device driver, "
1253 "reason=%s\n", errorstring
);
1256 if (cqr
->callback
!= NULL
)
1257 (callback
)(cqr
, callback_data
);
1259 spin_unlock_bh(&block
->queue_lock
);
1264 * Take a look at the first request on the ccw queue and check
1265 * if it reached its expire time. If so, terminate the IO.
1267 static void __dasd_device_check_expire(struct dasd_device
*device
)
1269 struct dasd_ccw_req
*cqr
;
1271 if (list_empty(&device
->ccw_queue
))
1273 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, devlist
);
1274 if ((cqr
->status
== DASD_CQR_IN_IO
&& cqr
->expires
!= 0) &&
1275 (time_after_eq(jiffies
, cqr
->expires
+ cqr
->starttime
))) {
1276 if (device
->discipline
->term_IO(cqr
) != 0) {
1277 /* Hmpf, try again in 5 sec */
1278 dev_err(&device
->cdev
->dev
,
1279 "cqr %p timed out (%is) but cannot be "
1280 "ended, retrying in 5 s\n",
1281 cqr
, (cqr
->expires
/HZ
));
1282 cqr
->expires
+= 5*HZ
;
1283 dasd_device_set_timer(device
, 5*HZ
);
1285 dev_err(&device
->cdev
->dev
,
1286 "cqr %p timed out (%is), %i retries "
1287 "remaining\n", cqr
, (cqr
->expires
/HZ
),
1294 * Take a look at the first request on the ccw queue and check
1295 * if it needs to be started.
1297 static void __dasd_device_start_head(struct dasd_device
*device
)
1299 struct dasd_ccw_req
*cqr
;
1302 if (list_empty(&device
->ccw_queue
))
1304 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, devlist
);
1305 if (cqr
->status
!= DASD_CQR_QUEUED
)
1307 /* when device is stopped, return request to previous layer */
1308 if (device
->stopped
) {
1309 cqr
->status
= DASD_CQR_CLEARED
;
1310 dasd_schedule_device_bh(device
);
1314 rc
= device
->discipline
->start_IO(cqr
);
1316 dasd_device_set_timer(device
, cqr
->expires
);
1317 else if (rc
== -EACCES
) {
1318 dasd_schedule_device_bh(device
);
1320 /* Hmpf, try again in 1/2 sec */
1321 dasd_device_set_timer(device
, 50);
1325 * Go through all request on the dasd_device request queue,
1326 * terminate them on the cdev if necessary, and return them to the
1327 * submitting layer via callback.
1329 * Make sure that all 'submitting layers' still exist when
1330 * this function is called!. In other words, when 'device' is a base
1331 * device then all block layer requests must have been removed before
1332 * via dasd_flush_block_queue.
1334 int dasd_flush_device_queue(struct dasd_device
*device
)
1336 struct dasd_ccw_req
*cqr
, *n
;
1338 struct list_head flush_queue
;
1340 INIT_LIST_HEAD(&flush_queue
);
1341 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1343 list_for_each_entry_safe(cqr
, n
, &device
->ccw_queue
, devlist
) {
1344 /* Check status and move request to flush_queue */
1345 switch (cqr
->status
) {
1346 case DASD_CQR_IN_IO
:
1347 rc
= device
->discipline
->term_IO(cqr
);
1349 /* unable to terminate requeust */
1350 dev_err(&device
->cdev
->dev
,
1351 "Flushing the DASD request queue "
1352 "failed for request %p\n", cqr
);
1353 /* stop flush processing */
1357 case DASD_CQR_QUEUED
:
1358 cqr
->stopclk
= get_clock();
1359 cqr
->status
= DASD_CQR_CLEARED
;
1361 default: /* no need to modify the others */
1364 list_move_tail(&cqr
->devlist
, &flush_queue
);
1367 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1369 * After this point all requests must be in state CLEAR_PENDING,
1370 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
1371 * one of the others.
1373 list_for_each_entry_safe(cqr
, n
, &flush_queue
, devlist
)
1374 wait_event(dasd_flush_wq
,
1375 (cqr
->status
!= DASD_CQR_CLEAR_PENDING
));
1377 * Now set each request back to TERMINATED, DONE or NEED_ERP
1378 * and call the callback function of flushed requests
1380 __dasd_device_process_final_queue(device
, &flush_queue
);
1385 * Acquire the device lock and process queues for the device.
1387 static void dasd_device_tasklet(struct dasd_device
*device
)
1389 struct list_head final_queue
;
1391 atomic_set (&device
->tasklet_scheduled
, 0);
1392 INIT_LIST_HEAD(&final_queue
);
1393 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1394 /* Check expire time of first request on the ccw queue. */
1395 __dasd_device_check_expire(device
);
1396 /* find final requests on ccw queue */
1397 __dasd_device_process_ccw_queue(device
, &final_queue
);
1398 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1399 /* Now call the callback function of requests with final status */
1400 __dasd_device_process_final_queue(device
, &final_queue
);
1401 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1402 /* Now check if the head of the ccw queue needs to be started. */
1403 __dasd_device_start_head(device
);
1404 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1405 dasd_put_device(device
);
1409 * Schedules a call to dasd_tasklet over the device tasklet.
1411 void dasd_schedule_device_bh(struct dasd_device
*device
)
1413 /* Protect against rescheduling. */
1414 if (atomic_cmpxchg (&device
->tasklet_scheduled
, 0, 1) != 0)
1416 dasd_get_device(device
);
1417 tasklet_hi_schedule(&device
->tasklet
);
1420 void dasd_device_set_stop_bits(struct dasd_device
*device
, int bits
)
1422 device
->stopped
|= bits
;
1424 EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits
);
1426 void dasd_device_remove_stop_bits(struct dasd_device
*device
, int bits
)
1428 device
->stopped
&= ~bits
;
1429 if (!device
->stopped
)
1430 wake_up(&generic_waitq
);
1432 EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits
);
1435 * Queue a request to the head of the device ccw_queue.
1436 * Start the I/O if possible.
1438 void dasd_add_request_head(struct dasd_ccw_req
*cqr
)
1440 struct dasd_device
*device
;
1441 unsigned long flags
;
1443 device
= cqr
->startdev
;
1444 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1445 cqr
->status
= DASD_CQR_QUEUED
;
1446 list_add(&cqr
->devlist
, &device
->ccw_queue
);
1447 /* let the bh start the request to keep them in order */
1448 dasd_schedule_device_bh(device
);
1449 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1453 * Queue a request to the tail of the device ccw_queue.
1454 * Start the I/O if possible.
1456 void dasd_add_request_tail(struct dasd_ccw_req
*cqr
)
1458 struct dasd_device
*device
;
1459 unsigned long flags
;
1461 device
= cqr
->startdev
;
1462 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1463 cqr
->status
= DASD_CQR_QUEUED
;
1464 list_add_tail(&cqr
->devlist
, &device
->ccw_queue
);
1465 /* let the bh start the request to keep them in order */
1466 dasd_schedule_device_bh(device
);
1467 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1471 * Wakeup helper for the 'sleep_on' functions.
1473 static void dasd_wakeup_cb(struct dasd_ccw_req
*cqr
, void *data
)
1475 wake_up((wait_queue_head_t
*) data
);
1478 static inline int _wait_for_wakeup(struct dasd_ccw_req
*cqr
)
1480 struct dasd_device
*device
;
1483 device
= cqr
->startdev
;
1484 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1485 rc
= ((cqr
->status
== DASD_CQR_DONE
||
1486 cqr
->status
== DASD_CQR_NEED_ERP
||
1487 cqr
->status
== DASD_CQR_TERMINATED
) &&
1488 list_empty(&cqr
->devlist
));
1489 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1494 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
1496 static int __dasd_sleep_on_erp(struct dasd_ccw_req
*cqr
)
1498 struct dasd_device
*device
;
1499 dasd_erp_fn_t erp_fn
;
1501 if (cqr
->status
== DASD_CQR_FILLED
)
1503 device
= cqr
->startdev
;
1504 if (test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
)) {
1505 if (cqr
->status
== DASD_CQR_TERMINATED
) {
1506 device
->discipline
->handle_terminated_request(cqr
);
1509 if (cqr
->status
== DASD_CQR_NEED_ERP
) {
1510 erp_fn
= device
->discipline
->erp_action(cqr
);
1514 if (cqr
->status
== DASD_CQR_FAILED
)
1515 dasd_log_sense(cqr
, &cqr
->irb
);
1517 __dasd_process_erp(device
, cqr
);
1524 static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req
*cqr
)
1526 if (test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
)) {
1527 if (cqr
->refers
) /* erp is not done yet */
1529 return ((cqr
->status
!= DASD_CQR_DONE
) &&
1530 (cqr
->status
!= DASD_CQR_FAILED
));
1532 return (cqr
->status
== DASD_CQR_FILLED
);
1535 static int _dasd_sleep_on(struct dasd_ccw_req
*maincqr
, int interruptible
)
1537 struct dasd_device
*device
;
1539 struct list_head ccw_queue
;
1540 struct dasd_ccw_req
*cqr
;
1542 INIT_LIST_HEAD(&ccw_queue
);
1543 maincqr
->status
= DASD_CQR_FILLED
;
1544 device
= maincqr
->startdev
;
1545 list_add(&maincqr
->blocklist
, &ccw_queue
);
1546 for (cqr
= maincqr
; __dasd_sleep_on_loop_condition(cqr
);
1547 cqr
= list_first_entry(&ccw_queue
,
1548 struct dasd_ccw_req
, blocklist
)) {
1550 if (__dasd_sleep_on_erp(cqr
))
1552 if (cqr
->status
!= DASD_CQR_FILLED
) /* could be failed */
1555 /* Non-temporary stop condition will trigger fail fast */
1556 if (device
->stopped
& ~DASD_STOPPED_PENDING
&&
1557 test_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
) &&
1558 (!dasd_eer_enabled(device
))) {
1559 cqr
->status
= DASD_CQR_FAILED
;
1563 /* Don't try to start requests if device is stopped */
1564 if (interruptible
) {
1565 rc
= wait_event_interruptible(
1566 generic_waitq
, !(device
->stopped
));
1567 if (rc
== -ERESTARTSYS
) {
1568 cqr
->status
= DASD_CQR_FAILED
;
1569 maincqr
->intrc
= rc
;
1573 wait_event(generic_waitq
, !(device
->stopped
));
1575 cqr
->callback
= dasd_wakeup_cb
;
1576 cqr
->callback_data
= (void *) &generic_waitq
;
1577 dasd_add_request_tail(cqr
);
1578 if (interruptible
) {
1579 rc
= wait_event_interruptible(
1580 generic_waitq
, _wait_for_wakeup(cqr
));
1581 if (rc
== -ERESTARTSYS
) {
1582 dasd_cancel_req(cqr
);
1583 /* wait (non-interruptible) for final status */
1584 wait_event(generic_waitq
,
1585 _wait_for_wakeup(cqr
));
1586 cqr
->status
= DASD_CQR_FAILED
;
1587 maincqr
->intrc
= rc
;
1591 wait_event(generic_waitq
, _wait_for_wakeup(cqr
));
1594 maincqr
->endclk
= get_clock();
1595 if ((maincqr
->status
!= DASD_CQR_DONE
) &&
1596 (maincqr
->intrc
!= -ERESTARTSYS
))
1597 dasd_log_sense(maincqr
, &maincqr
->irb
);
1598 if (maincqr
->status
== DASD_CQR_DONE
)
1600 else if (maincqr
->intrc
)
1601 rc
= maincqr
->intrc
;
1608 * Queue a request to the tail of the device ccw_queue and wait for
1611 int dasd_sleep_on(struct dasd_ccw_req
*cqr
)
1613 return _dasd_sleep_on(cqr
, 0);
1617 * Queue a request to the tail of the device ccw_queue and wait
1618 * interruptible for it's completion.
1620 int dasd_sleep_on_interruptible(struct dasd_ccw_req
*cqr
)
1622 return _dasd_sleep_on(cqr
, 1);
1626 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
1627 * for eckd devices) the currently running request has to be terminated
1628 * and be put back to status queued, before the special request is added
1629 * to the head of the queue. Then the special request is waited on normally.
1631 static inline int _dasd_term_running_cqr(struct dasd_device
*device
)
1633 struct dasd_ccw_req
*cqr
;
1635 if (list_empty(&device
->ccw_queue
))
1637 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, devlist
);
1638 return device
->discipline
->term_IO(cqr
);
1641 int dasd_sleep_on_immediatly(struct dasd_ccw_req
*cqr
)
1643 struct dasd_device
*device
;
1646 device
= cqr
->startdev
;
1647 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1648 rc
= _dasd_term_running_cqr(device
);
1650 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1654 cqr
->callback
= dasd_wakeup_cb
;
1655 cqr
->callback_data
= (void *) &generic_waitq
;
1656 cqr
->status
= DASD_CQR_QUEUED
;
1657 list_add(&cqr
->devlist
, &device
->ccw_queue
);
1659 /* let the bh start the request to keep them in order */
1660 dasd_schedule_device_bh(device
);
1662 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1664 wait_event(generic_waitq
, _wait_for_wakeup(cqr
));
1666 if (cqr
->status
== DASD_CQR_DONE
)
1668 else if (cqr
->intrc
)
1676 * Cancels a request that was started with dasd_sleep_on_req.
1677 * This is useful to timeout requests. The request will be
1678 * terminated if it is currently in i/o.
1679 * Returns 1 if the request has been terminated.
1680 * 0 if there was no need to terminate the request (not started yet)
1681 * negative error code if termination failed
1682 * Cancellation of a request is an asynchronous operation! The calling
1683 * function has to wait until the request is properly returned via callback.
1685 int dasd_cancel_req(struct dasd_ccw_req
*cqr
)
1687 struct dasd_device
*device
= cqr
->startdev
;
1688 unsigned long flags
;
1692 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1693 switch (cqr
->status
) {
1694 case DASD_CQR_QUEUED
:
1695 /* request was not started - just set to cleared */
1696 cqr
->status
= DASD_CQR_CLEARED
;
1698 case DASD_CQR_IN_IO
:
1699 /* request in IO - terminate IO and release again */
1700 rc
= device
->discipline
->term_IO(cqr
);
1702 dev_err(&device
->cdev
->dev
,
1703 "Cancelling request %p failed with rc=%d\n",
1706 cqr
->stopclk
= get_clock();
1709 default: /* already finished or clear pending - do nothing */
1712 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1713 dasd_schedule_device_bh(device
);
1719 * SECTION: Operations of the dasd_block layer.
1723 * Timeout function for dasd_block. This is used when the block layer
1724 * is waiting for something that may not come reliably, (e.g. a state
1727 static void dasd_block_timeout(unsigned long ptr
)
1729 unsigned long flags
;
1730 struct dasd_block
*block
;
1732 block
= (struct dasd_block
*) ptr
;
1733 spin_lock_irqsave(get_ccwdev_lock(block
->base
->cdev
), flags
);
1734 /* re-activate request queue */
1735 dasd_device_remove_stop_bits(block
->base
, DASD_STOPPED_PENDING
);
1736 spin_unlock_irqrestore(get_ccwdev_lock(block
->base
->cdev
), flags
);
1737 dasd_schedule_block_bh(block
);
1741 * Setup timeout for a dasd_block in jiffies.
1743 void dasd_block_set_timer(struct dasd_block
*block
, int expires
)
1746 del_timer(&block
->timer
);
1748 mod_timer(&block
->timer
, jiffies
+ expires
);
1752 * Clear timeout for a dasd_block.
1754 void dasd_block_clear_timer(struct dasd_block
*block
)
1756 del_timer(&block
->timer
);
1760 * Process finished error recovery ccw.
1762 static void __dasd_process_erp(struct dasd_device
*device
,
1763 struct dasd_ccw_req
*cqr
)
1765 dasd_erp_fn_t erp_fn
;
1767 if (cqr
->status
== DASD_CQR_DONE
)
1768 DBF_DEV_EVENT(DBF_NOTICE
, device
, "%s", "ERP successful");
1770 dev_err(&device
->cdev
->dev
, "ERP failed for the DASD\n");
1771 erp_fn
= device
->discipline
->erp_postaction(cqr
);
1776 * Fetch requests from the block device queue.
1778 static void __dasd_process_request_queue(struct dasd_block
*block
)
1780 struct request_queue
*queue
;
1781 struct request
*req
;
1782 struct dasd_ccw_req
*cqr
;
1783 struct dasd_device
*basedev
;
1784 unsigned long flags
;
1785 queue
= block
->request_queue
;
1786 basedev
= block
->base
;
1787 /* No queue ? Then there is nothing to do. */
1792 * We requeue request from the block device queue to the ccw
1793 * queue only in two states. In state DASD_STATE_READY the
1794 * partition detection is done and we need to requeue requests
1795 * for that. State DASD_STATE_ONLINE is normal block device
1798 if (basedev
->state
< DASD_STATE_READY
) {
1799 while ((req
= blk_fetch_request(block
->request_queue
)))
1800 __blk_end_request_all(req
, -EIO
);
1803 /* Now we try to fetch requests from the request queue */
1804 while (!blk_queue_plugged(queue
) && (req
= blk_peek_request(queue
))) {
1805 if (basedev
->features
& DASD_FEATURE_READONLY
&&
1806 rq_data_dir(req
) == WRITE
) {
1807 DBF_DEV_EVENT(DBF_ERR
, basedev
,
1808 "Rejecting write request %p",
1810 blk_start_request(req
);
1811 __blk_end_request_all(req
, -EIO
);
1814 cqr
= basedev
->discipline
->build_cp(basedev
, block
, req
);
1816 if (PTR_ERR(cqr
) == -EBUSY
)
1817 break; /* normal end condition */
1818 if (PTR_ERR(cqr
) == -ENOMEM
)
1819 break; /* terminate request queue loop */
1820 if (PTR_ERR(cqr
) == -EAGAIN
) {
1822 * The current request cannot be build right
1823 * now, we have to try later. If this request
1824 * is the head-of-queue we stop the device
1827 if (!list_empty(&block
->ccw_queue
))
1830 get_ccwdev_lock(basedev
->cdev
), flags
);
1831 dasd_device_set_stop_bits(basedev
,
1832 DASD_STOPPED_PENDING
);
1833 spin_unlock_irqrestore(
1834 get_ccwdev_lock(basedev
->cdev
), flags
);
1835 dasd_block_set_timer(block
, HZ
/2);
1838 DBF_DEV_EVENT(DBF_ERR
, basedev
,
1839 "CCW creation failed (rc=%ld) "
1842 blk_start_request(req
);
1843 __blk_end_request_all(req
, -EIO
);
1847 * Note: callback is set to dasd_return_cqr_cb in
1848 * __dasd_block_start_head to cover erp requests as well
1850 cqr
->callback_data
= (void *) req
;
1851 cqr
->status
= DASD_CQR_FILLED
;
1852 blk_start_request(req
);
1853 list_add_tail(&cqr
->blocklist
, &block
->ccw_queue
);
1854 dasd_profile_start(block
, cqr
, req
);
1858 static void __dasd_cleanup_cqr(struct dasd_ccw_req
*cqr
)
1860 struct request
*req
;
1864 req
= (struct request
*) cqr
->callback_data
;
1865 dasd_profile_end(cqr
->block
, cqr
, req
);
1866 status
= cqr
->block
->base
->discipline
->free_cp(cqr
, req
);
1868 error
= status
? status
: -EIO
;
1869 __blk_end_request_all(req
, error
);
1873 * Process ccw request queue.
1875 static void __dasd_process_block_ccw_queue(struct dasd_block
*block
,
1876 struct list_head
*final_queue
)
1878 struct list_head
*l
, *n
;
1879 struct dasd_ccw_req
*cqr
;
1880 dasd_erp_fn_t erp_fn
;
1881 unsigned long flags
;
1882 struct dasd_device
*base
= block
->base
;
1885 /* Process request with final status. */
1886 list_for_each_safe(l
, n
, &block
->ccw_queue
) {
1887 cqr
= list_entry(l
, struct dasd_ccw_req
, blocklist
);
1888 if (cqr
->status
!= DASD_CQR_DONE
&&
1889 cqr
->status
!= DASD_CQR_FAILED
&&
1890 cqr
->status
!= DASD_CQR_NEED_ERP
&&
1891 cqr
->status
!= DASD_CQR_TERMINATED
)
1894 if (cqr
->status
== DASD_CQR_TERMINATED
) {
1895 base
->discipline
->handle_terminated_request(cqr
);
1899 /* Process requests that may be recovered */
1900 if (cqr
->status
== DASD_CQR_NEED_ERP
) {
1901 erp_fn
= base
->discipline
->erp_action(cqr
);
1906 /* log sense for fatal error */
1907 if (cqr
->status
== DASD_CQR_FAILED
) {
1908 dasd_log_sense(cqr
, &cqr
->irb
);
1911 /* First of all call extended error reporting. */
1912 if (dasd_eer_enabled(base
) &&
1913 cqr
->status
== DASD_CQR_FAILED
) {
1914 dasd_eer_write(base
, cqr
, DASD_EER_FATALERROR
);
1916 /* restart request */
1917 cqr
->status
= DASD_CQR_FILLED
;
1919 spin_lock_irqsave(get_ccwdev_lock(base
->cdev
), flags
);
1920 dasd_device_set_stop_bits(base
, DASD_STOPPED_QUIESCE
);
1921 spin_unlock_irqrestore(get_ccwdev_lock(base
->cdev
),
1926 /* Process finished ERP request. */
1928 __dasd_process_erp(base
, cqr
);
1932 /* Rechain finished requests to final queue */
1933 cqr
->endclk
= get_clock();
1934 list_move_tail(&cqr
->blocklist
, final_queue
);
1938 static void dasd_return_cqr_cb(struct dasd_ccw_req
*cqr
, void *data
)
1940 dasd_schedule_block_bh(cqr
->block
);
1943 static void __dasd_block_start_head(struct dasd_block
*block
)
1945 struct dasd_ccw_req
*cqr
;
1947 if (list_empty(&block
->ccw_queue
))
1949 /* We allways begin with the first requests on the queue, as some
1950 * of previously started requests have to be enqueued on a
1951 * dasd_device again for error recovery.
1953 list_for_each_entry(cqr
, &block
->ccw_queue
, blocklist
) {
1954 if (cqr
->status
!= DASD_CQR_FILLED
)
1956 /* Non-temporary stop condition will trigger fail fast */
1957 if (block
->base
->stopped
& ~DASD_STOPPED_PENDING
&&
1958 test_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
) &&
1959 (!dasd_eer_enabled(block
->base
))) {
1960 cqr
->status
= DASD_CQR_FAILED
;
1961 dasd_schedule_block_bh(block
);
1964 /* Don't try to start requests if device is stopped */
1965 if (block
->base
->stopped
)
1968 /* just a fail safe check, should not happen */
1970 cqr
->startdev
= block
->base
;
1972 /* make sure that the requests we submit find their way back */
1973 cqr
->callback
= dasd_return_cqr_cb
;
1975 dasd_add_request_tail(cqr
);
1980 * Central dasd_block layer routine. Takes requests from the generic
1981 * block layer request queue, creates ccw requests, enqueues them on
1982 * a dasd_device and processes ccw requests that have been returned.
1984 static void dasd_block_tasklet(struct dasd_block
*block
)
1986 struct list_head final_queue
;
1987 struct list_head
*l
, *n
;
1988 struct dasd_ccw_req
*cqr
;
1990 atomic_set(&block
->tasklet_scheduled
, 0);
1991 INIT_LIST_HEAD(&final_queue
);
1992 spin_lock(&block
->queue_lock
);
1993 /* Finish off requests on ccw queue */
1994 __dasd_process_block_ccw_queue(block
, &final_queue
);
1995 spin_unlock(&block
->queue_lock
);
1996 /* Now call the callback function of requests with final status */
1997 spin_lock_irq(&block
->request_queue_lock
);
1998 list_for_each_safe(l
, n
, &final_queue
) {
1999 cqr
= list_entry(l
, struct dasd_ccw_req
, blocklist
);
2000 list_del_init(&cqr
->blocklist
);
2001 __dasd_cleanup_cqr(cqr
);
2003 spin_lock(&block
->queue_lock
);
2004 /* Get new request from the block device request queue */
2005 __dasd_process_request_queue(block
);
2006 /* Now check if the head of the ccw queue needs to be started. */
2007 __dasd_block_start_head(block
);
2008 spin_unlock(&block
->queue_lock
);
2009 spin_unlock_irq(&block
->request_queue_lock
);
2010 dasd_put_device(block
->base
);
2013 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req
*cqr
, void *data
)
2015 wake_up(&dasd_flush_wq
);
2019 * Go through all request on the dasd_block request queue, cancel them
2020 * on the respective dasd_device, and return them to the generic
2023 static int dasd_flush_block_queue(struct dasd_block
*block
)
2025 struct dasd_ccw_req
*cqr
, *n
;
2027 struct list_head flush_queue
;
2029 INIT_LIST_HEAD(&flush_queue
);
2030 spin_lock_bh(&block
->queue_lock
);
2033 list_for_each_entry_safe(cqr
, n
, &block
->ccw_queue
, blocklist
) {
2034 /* if this request currently owned by a dasd_device cancel it */
2035 if (cqr
->status
>= DASD_CQR_QUEUED
)
2036 rc
= dasd_cancel_req(cqr
);
2039 /* Rechain request (including erp chain) so it won't be
2040 * touched by the dasd_block_tasklet anymore.
2041 * Replace the callback so we notice when the request
2042 * is returned from the dasd_device layer.
2044 cqr
->callback
= _dasd_wake_block_flush_cb
;
2045 for (i
= 0; cqr
!= NULL
; cqr
= cqr
->refers
, i
++)
2046 list_move_tail(&cqr
->blocklist
, &flush_queue
);
2048 /* moved more than one request - need to restart */
2051 spin_unlock_bh(&block
->queue_lock
);
2052 /* Now call the callback function of flushed requests */
2054 list_for_each_entry_safe(cqr
, n
, &flush_queue
, blocklist
) {
2055 wait_event(dasd_flush_wq
, (cqr
->status
< DASD_CQR_QUEUED
));
2056 /* Process finished ERP request. */
2058 spin_lock_bh(&block
->queue_lock
);
2059 __dasd_process_erp(block
->base
, cqr
);
2060 spin_unlock_bh(&block
->queue_lock
);
2061 /* restart list_for_xx loop since dasd_process_erp
2062 * might remove multiple elements */
2065 /* call the callback function */
2066 spin_lock_irq(&block
->request_queue_lock
);
2067 cqr
->endclk
= get_clock();
2068 list_del_init(&cqr
->blocklist
);
2069 __dasd_cleanup_cqr(cqr
);
2070 spin_unlock_irq(&block
->request_queue_lock
);
2076 * Schedules a call to dasd_tasklet over the device tasklet.
2078 void dasd_schedule_block_bh(struct dasd_block
*block
)
2080 /* Protect against rescheduling. */
2081 if (atomic_cmpxchg(&block
->tasklet_scheduled
, 0, 1) != 0)
2083 /* life cycle of block is bound to it's base device */
2084 dasd_get_device(block
->base
);
2085 tasklet_hi_schedule(&block
->tasklet
);
2090 * SECTION: external block device operations
2091 * (request queue handling, open, release, etc.)
2095 * Dasd request queue function. Called from ll_rw_blk.c
2097 static void do_dasd_request(struct request_queue
*queue
)
2099 struct dasd_block
*block
;
2101 block
= queue
->queuedata
;
2102 spin_lock(&block
->queue_lock
);
2103 /* Get new request from the block device request queue */
2104 __dasd_process_request_queue(block
);
2105 /* Now check if the head of the ccw queue needs to be started. */
2106 __dasd_block_start_head(block
);
2107 spin_unlock(&block
->queue_lock
);
2111 * Allocate and initialize request queue and default I/O scheduler.
2113 static int dasd_alloc_queue(struct dasd_block
*block
)
2117 block
->request_queue
= blk_init_queue(do_dasd_request
,
2118 &block
->request_queue_lock
);
2119 if (block
->request_queue
== NULL
)
2122 block
->request_queue
->queuedata
= block
;
2124 elevator_exit(block
->request_queue
->elevator
);
2125 block
->request_queue
->elevator
= NULL
;
2126 rc
= elevator_init(block
->request_queue
, "deadline");
2128 blk_cleanup_queue(block
->request_queue
);
2135 * Allocate and initialize request queue.
2137 static void dasd_setup_queue(struct dasd_block
*block
)
2141 blk_queue_logical_block_size(block
->request_queue
, block
->bp_block
);
2142 max
= block
->base
->discipline
->max_blocks
<< block
->s2b_shift
;
2143 blk_queue_max_hw_sectors(block
->request_queue
, max
);
2144 blk_queue_max_segments(block
->request_queue
, -1L);
2145 /* with page sized segments we can translate each segement into
2148 blk_queue_max_segment_size(block
->request_queue
, PAGE_SIZE
);
2149 blk_queue_segment_boundary(block
->request_queue
, PAGE_SIZE
- 1);
2150 blk_queue_ordered(block
->request_queue
, QUEUE_ORDERED_DRAIN
, NULL
);
2154 * Deactivate and free request queue.
2156 static void dasd_free_queue(struct dasd_block
*block
)
2158 if (block
->request_queue
) {
2159 blk_cleanup_queue(block
->request_queue
);
2160 block
->request_queue
= NULL
;
2165 * Flush request on the request queue.
2167 static void dasd_flush_request_queue(struct dasd_block
*block
)
2169 struct request
*req
;
2171 if (!block
->request_queue
)
2174 spin_lock_irq(&block
->request_queue_lock
);
2175 while ((req
= blk_fetch_request(block
->request_queue
)))
2176 __blk_end_request_all(req
, -EIO
);
2177 spin_unlock_irq(&block
->request_queue_lock
);
2180 static int dasd_open(struct block_device
*bdev
, fmode_t mode
)
2182 struct dasd_block
*block
= bdev
->bd_disk
->private_data
;
2183 struct dasd_device
*base
;
2190 atomic_inc(&block
->open_count
);
2191 if (test_bit(DASD_FLAG_OFFLINE
, &base
->flags
)) {
2196 if (!try_module_get(base
->discipline
->owner
)) {
2201 if (dasd_probeonly
) {
2202 dev_info(&base
->cdev
->dev
,
2203 "Accessing the DASD failed because it is in "
2204 "probeonly mode\n");
2209 if (base
->state
<= DASD_STATE_BASIC
) {
2210 DBF_DEV_EVENT(DBF_ERR
, base
, " %s",
2211 " Cannot open unrecognized device");
2216 if ((mode
& FMODE_WRITE
) &&
2217 (test_bit(DASD_FLAG_DEVICE_RO
, &base
->flags
) ||
2218 (base
->features
& DASD_FEATURE_READONLY
))) {
2226 module_put(base
->discipline
->owner
);
2228 atomic_dec(&block
->open_count
);
2232 static int dasd_release(struct gendisk
*disk
, fmode_t mode
)
2234 struct dasd_block
*block
= disk
->private_data
;
2236 atomic_dec(&block
->open_count
);
2237 module_put(block
->base
->discipline
->owner
);
2242 * Return disk geometry.
2244 static int dasd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
2246 struct dasd_block
*block
;
2247 struct dasd_device
*base
;
2249 block
= bdev
->bd_disk
->private_data
;
2254 if (!base
->discipline
||
2255 !base
->discipline
->fill_geometry
)
2258 base
->discipline
->fill_geometry(block
, geo
);
2259 geo
->start
= get_start_sect(bdev
) >> block
->s2b_shift
;
2263 const struct block_device_operations
2264 dasd_device_operations
= {
2265 .owner
= THIS_MODULE
,
2267 .release
= dasd_release
,
2268 .ioctl
= dasd_ioctl
,
2269 .compat_ioctl
= dasd_ioctl
,
2270 .getgeo
= dasd_getgeo
,
2273 /*******************************************************************************
2274 * end of block device operations
2280 #ifdef CONFIG_PROC_FS
2284 if (dasd_page_cache
!= NULL
) {
2285 kmem_cache_destroy(dasd_page_cache
);
2286 dasd_page_cache
= NULL
;
2288 dasd_gendisk_exit();
2290 if (dasd_debug_area
!= NULL
) {
2291 debug_unregister(dasd_debug_area
);
2292 dasd_debug_area
= NULL
;
2297 * SECTION: common functions for ccw_driver use
2301 * Is the device read-only?
2302 * Note that this function does not report the setting of the
2303 * readonly device attribute, but how it is configured in z/VM.
2305 int dasd_device_is_ro(struct dasd_device
*device
)
2307 struct ccw_dev_id dev_id
;
2308 struct diag210 diag_data
;
2313 ccw_device_get_id(device
->cdev
, &dev_id
);
2314 memset(&diag_data
, 0, sizeof(diag_data
));
2315 diag_data
.vrdcdvno
= dev_id
.devno
;
2316 diag_data
.vrdclen
= sizeof(diag_data
);
2317 rc
= diag210(&diag_data
);
2318 if (rc
== 0 || rc
== 2) {
2319 return diag_data
.vrdcvfla
& 0x80;
2321 DBF_EVENT(DBF_WARNING
, "diag210 failed for dev=%04x with rc=%d",
2326 EXPORT_SYMBOL_GPL(dasd_device_is_ro
);
2328 static void dasd_generic_auto_online(void *data
, async_cookie_t cookie
)
2330 struct ccw_device
*cdev
= data
;
2333 ret
= ccw_device_set_online(cdev
);
2335 pr_warning("%s: Setting the DASD online failed with rc=%d\n",
2336 dev_name(&cdev
->dev
), ret
);
2340 * Initial attempt at a probe function. this can be simplified once
2341 * the other detection code is gone.
2343 int dasd_generic_probe(struct ccw_device
*cdev
,
2344 struct dasd_discipline
*discipline
)
2348 ret
= dasd_add_sysfs_files(cdev
);
2350 DBF_EVENT_DEVID(DBF_WARNING
, cdev
, "%s",
2351 "dasd_generic_probe: could not add "
2355 cdev
->handler
= &dasd_int_handler
;
2358 * Automatically online either all dasd devices (dasd_autodetect)
2359 * or all devices specified with dasd= parameters during
2362 if ((dasd_get_feature(cdev
, DASD_FEATURE_INITIAL_ONLINE
) > 0 ) ||
2363 (dasd_autodetect
&& dasd_busid_known(dev_name(&cdev
->dev
)) != 0))
2364 async_schedule(dasd_generic_auto_online
, cdev
);
2369 * This will one day be called from a global not_oper handler.
2370 * It is also used by driver_unregister during module unload.
2372 void dasd_generic_remove(struct ccw_device
*cdev
)
2374 struct dasd_device
*device
;
2375 struct dasd_block
*block
;
2377 cdev
->handler
= NULL
;
2379 dasd_remove_sysfs_files(cdev
);
2380 device
= dasd_device_from_cdev(cdev
);
2383 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
2384 /* Already doing offline processing */
2385 dasd_put_device(device
);
2389 * This device is removed unconditionally. Set offline
2390 * flag to prevent dasd_open from opening it while it is
2391 * no quite down yet.
2393 dasd_set_target_state(device
, DASD_STATE_NEW
);
2394 /* dasd_delete_device destroys the device reference. */
2395 block
= device
->block
;
2396 device
->block
= NULL
;
2397 dasd_delete_device(device
);
2399 * life cycle of block is bound to device, so delete it after
2400 * device was safely removed
2403 dasd_free_block(block
);
2407 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
2408 * the device is detected for the first time and is supposed to be used
2409 * or the user has started activation through sysfs.
2411 int dasd_generic_set_online(struct ccw_device
*cdev
,
2412 struct dasd_discipline
*base_discipline
)
2414 struct dasd_discipline
*discipline
;
2415 struct dasd_device
*device
;
2418 /* first online clears initial online feature flag */
2419 dasd_set_feature(cdev
, DASD_FEATURE_INITIAL_ONLINE
, 0);
2420 device
= dasd_create_device(cdev
);
2422 return PTR_ERR(device
);
2424 discipline
= base_discipline
;
2425 if (device
->features
& DASD_FEATURE_USEDIAG
) {
2426 if (!dasd_diag_discipline_pointer
) {
2427 pr_warning("%s Setting the DASD online failed because "
2428 "of missing DIAG discipline\n",
2429 dev_name(&cdev
->dev
));
2430 dasd_delete_device(device
);
2433 discipline
= dasd_diag_discipline_pointer
;
2435 if (!try_module_get(base_discipline
->owner
)) {
2436 dasd_delete_device(device
);
2439 if (!try_module_get(discipline
->owner
)) {
2440 module_put(base_discipline
->owner
);
2441 dasd_delete_device(device
);
2444 device
->base_discipline
= base_discipline
;
2445 device
->discipline
= discipline
;
2447 /* check_device will allocate block device if necessary */
2448 rc
= discipline
->check_device(device
);
2450 pr_warning("%s Setting the DASD online with discipline %s "
2451 "failed with rc=%i\n",
2452 dev_name(&cdev
->dev
), discipline
->name
, rc
);
2453 module_put(discipline
->owner
);
2454 module_put(base_discipline
->owner
);
2455 dasd_delete_device(device
);
2459 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
2460 if (device
->state
<= DASD_STATE_KNOWN
) {
2461 pr_warning("%s Setting the DASD online failed because of a "
2462 "missing discipline\n", dev_name(&cdev
->dev
));
2464 dasd_set_target_state(device
, DASD_STATE_NEW
);
2466 dasd_free_block(device
->block
);
2467 dasd_delete_device(device
);
2469 pr_debug("dasd_generic device %s found\n",
2470 dev_name(&cdev
->dev
));
2472 wait_event(dasd_init_waitq
, _wait_for_device(device
));
2474 dasd_put_device(device
);
2478 int dasd_generic_set_offline(struct ccw_device
*cdev
)
2480 struct dasd_device
*device
;
2481 struct dasd_block
*block
;
2482 int max_count
, open_count
;
2484 device
= dasd_device_from_cdev(cdev
);
2486 return PTR_ERR(device
);
2487 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
2488 /* Already doing offline processing */
2489 dasd_put_device(device
);
2493 * We must make sure that this device is currently not in use.
2494 * The open_count is increased for every opener, that includes
2495 * the blkdev_get in dasd_scan_partitions. We are only interested
2496 * in the other openers.
2498 if (device
->block
) {
2499 max_count
= device
->block
->bdev
? 0 : -1;
2500 open_count
= atomic_read(&device
->block
->open_count
);
2501 if (open_count
> max_count
) {
2503 pr_warning("%s: The DASD cannot be set offline "
2504 "with open count %i\n",
2505 dev_name(&cdev
->dev
), open_count
);
2507 pr_warning("%s: The DASD cannot be set offline "
2508 "while it is in use\n",
2509 dev_name(&cdev
->dev
));
2510 clear_bit(DASD_FLAG_OFFLINE
, &device
->flags
);
2511 dasd_put_device(device
);
2515 dasd_set_target_state(device
, DASD_STATE_NEW
);
2516 /* dasd_delete_device destroys the device reference. */
2517 block
= device
->block
;
2518 device
->block
= NULL
;
2519 dasd_delete_device(device
);
2521 * life cycle of block is bound to device, so delete it after
2522 * device was safely removed
2525 dasd_free_block(block
);
2529 int dasd_generic_notify(struct ccw_device
*cdev
, int event
)
2531 struct dasd_device
*device
;
2532 struct dasd_ccw_req
*cqr
;
2535 device
= dasd_device_from_cdev_locked(cdev
);
2543 /* First of all call extended error reporting. */
2544 dasd_eer_write(device
, NULL
, DASD_EER_NOPATH
);
2546 if (device
->state
< DASD_STATE_BASIC
)
2548 /* Device is active. We want to keep it. */
2549 list_for_each_entry(cqr
, &device
->ccw_queue
, devlist
)
2550 if (cqr
->status
== DASD_CQR_IN_IO
) {
2551 cqr
->status
= DASD_CQR_QUEUED
;
2554 dasd_device_set_stop_bits(device
, DASD_STOPPED_DC_WAIT
);
2555 dasd_device_clear_timer(device
);
2556 dasd_schedule_device_bh(device
);
2560 /* FIXME: add a sanity check. */
2561 dasd_device_remove_stop_bits(device
, DASD_STOPPED_DC_WAIT
);
2562 if (device
->stopped
& DASD_UNRESUMED_PM
) {
2563 dasd_device_remove_stop_bits(device
, DASD_UNRESUMED_PM
);
2564 dasd_restore_device(device
);
2568 dasd_schedule_device_bh(device
);
2570 dasd_schedule_block_bh(device
->block
);
2574 dasd_put_device(device
);
2578 int dasd_generic_pm_freeze(struct ccw_device
*cdev
)
2580 struct dasd_ccw_req
*cqr
, *n
;
2582 struct list_head freeze_queue
;
2583 struct dasd_device
*device
= dasd_device_from_cdev(cdev
);
2586 return PTR_ERR(device
);
2587 /* disallow new I/O */
2588 dasd_device_set_stop_bits(device
, DASD_STOPPED_PM
);
2589 /* clear active requests */
2590 INIT_LIST_HEAD(&freeze_queue
);
2591 spin_lock_irq(get_ccwdev_lock(cdev
));
2593 list_for_each_entry_safe(cqr
, n
, &device
->ccw_queue
, devlist
) {
2594 /* Check status and move request to flush_queue */
2595 if (cqr
->status
== DASD_CQR_IN_IO
) {
2596 rc
= device
->discipline
->term_IO(cqr
);
2598 /* unable to terminate requeust */
2599 dev_err(&device
->cdev
->dev
,
2600 "Unable to terminate request %p "
2601 "on suspend\n", cqr
);
2602 spin_unlock_irq(get_ccwdev_lock(cdev
));
2603 dasd_put_device(device
);
2607 list_move_tail(&cqr
->devlist
, &freeze_queue
);
2610 spin_unlock_irq(get_ccwdev_lock(cdev
));
2612 list_for_each_entry_safe(cqr
, n
, &freeze_queue
, devlist
) {
2613 wait_event(dasd_flush_wq
,
2614 (cqr
->status
!= DASD_CQR_CLEAR_PENDING
));
2615 if (cqr
->status
== DASD_CQR_CLEARED
)
2616 cqr
->status
= DASD_CQR_QUEUED
;
2618 /* move freeze_queue to start of the ccw_queue */
2619 spin_lock_irq(get_ccwdev_lock(cdev
));
2620 list_splice_tail(&freeze_queue
, &device
->ccw_queue
);
2621 spin_unlock_irq(get_ccwdev_lock(cdev
));
2623 if (device
->discipline
->freeze
)
2624 rc
= device
->discipline
->freeze(device
);
2626 dasd_put_device(device
);
2629 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze
);
2631 int dasd_generic_restore_device(struct ccw_device
*cdev
)
2633 struct dasd_device
*device
= dasd_device_from_cdev(cdev
);
2637 return PTR_ERR(device
);
2639 /* allow new IO again */
2640 dasd_device_remove_stop_bits(device
,
2641 (DASD_STOPPED_PM
| DASD_UNRESUMED_PM
));
2643 dasd_schedule_device_bh(device
);
2646 * call discipline restore function
2647 * if device is stopped do nothing e.g. for disconnected devices
2649 if (device
->discipline
->restore
&& !(device
->stopped
))
2650 rc
= device
->discipline
->restore(device
);
2651 if (rc
|| device
->stopped
)
2653 * if the resume failed for the DASD we put it in
2654 * an UNRESUMED stop state
2656 device
->stopped
|= DASD_UNRESUMED_PM
;
2659 dasd_schedule_block_bh(device
->block
);
2661 dasd_put_device(device
);
2664 EXPORT_SYMBOL_GPL(dasd_generic_restore_device
);
2666 static struct dasd_ccw_req
*dasd_generic_build_rdc(struct dasd_device
*device
,
2668 int rdc_buffer_size
,
2671 struct dasd_ccw_req
*cqr
;
2673 unsigned long *idaw
;
2675 cqr
= dasd_smalloc_request(magic
, 1 /* RDC */, rdc_buffer_size
, device
);
2678 /* internal error 13 - Allocating the RDC request failed*/
2679 dev_err(&device
->cdev
->dev
,
2680 "An error occurred in the DASD device driver, "
2681 "reason=%s\n", "13");
2686 ccw
->cmd_code
= CCW_CMD_RDC
;
2687 if (idal_is_needed(rdc_buffer
, rdc_buffer_size
)) {
2688 idaw
= (unsigned long *) (cqr
->data
);
2689 ccw
->cda
= (__u32
)(addr_t
) idaw
;
2690 ccw
->flags
= CCW_FLAG_IDA
;
2691 idaw
= idal_create_words(idaw
, rdc_buffer
, rdc_buffer_size
);
2693 ccw
->cda
= (__u32
)(addr_t
) rdc_buffer
;
2697 ccw
->count
= rdc_buffer_size
;
2698 cqr
->startdev
= device
;
2699 cqr
->memdev
= device
;
2700 cqr
->expires
= 10*HZ
;
2702 cqr
->buildclk
= get_clock();
2703 cqr
->status
= DASD_CQR_FILLED
;
2708 int dasd_generic_read_dev_chars(struct dasd_device
*device
, int magic
,
2709 void *rdc_buffer
, int rdc_buffer_size
)
2712 struct dasd_ccw_req
*cqr
;
2714 cqr
= dasd_generic_build_rdc(device
, rdc_buffer
, rdc_buffer_size
,
2717 return PTR_ERR(cqr
);
2719 ret
= dasd_sleep_on(cqr
);
2720 dasd_sfree_request(cqr
, cqr
->memdev
);
2723 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars
);
2726 * In command mode and transport mode we need to look for sense
2727 * data in different places. The sense data itself is allways
2728 * an array of 32 bytes, so we can unify the sense data access
2731 char *dasd_get_sense(struct irb
*irb
)
2733 struct tsb
*tsb
= NULL
;
2736 if (scsw_is_tm(&irb
->scsw
) && (irb
->scsw
.tm
.fcxs
== 0x01)) {
2737 if (irb
->scsw
.tm
.tcw
)
2738 tsb
= tcw_get_tsb((struct tcw
*)(unsigned long)
2740 if (tsb
&& tsb
->length
== 64 && tsb
->flags
)
2741 switch (tsb
->flags
& 0x07) {
2742 case 1: /* tsa_iostat */
2743 sense
= tsb
->tsa
.iostat
.sense
;
2745 case 2: /* tsa_ddpc */
2746 sense
= tsb
->tsa
.ddpc
.sense
;
2749 /* currently we don't use interrogate data */
2752 } else if (irb
->esw
.esw0
.erw
.cons
) {
2757 EXPORT_SYMBOL_GPL(dasd_get_sense
);
2759 static int __init
dasd_init(void)
2763 init_waitqueue_head(&dasd_init_waitq
);
2764 init_waitqueue_head(&dasd_flush_wq
);
2765 init_waitqueue_head(&generic_waitq
);
2767 /* register 'common' DASD debug area, used for all DBF_XXX calls */
2768 dasd_debug_area
= debug_register("dasd", 1, 1, 8 * sizeof(long));
2769 if (dasd_debug_area
== NULL
) {
2773 debug_register_view(dasd_debug_area
, &debug_sprintf_view
);
2774 debug_set_level(dasd_debug_area
, DBF_WARNING
);
2776 DBF_EVENT(DBF_EMERG
, "%s", "debug area created");
2778 dasd_diag_discipline_pointer
= NULL
;
2780 rc
= dasd_devmap_init();
2783 rc
= dasd_gendisk_init();
2789 rc
= dasd_eer_init();
2792 #ifdef CONFIG_PROC_FS
2793 rc
= dasd_proc_init();
2800 pr_info("The DASD device driver could not be initialized\n");
2805 module_init(dasd_init
);
2806 module_exit(dasd_exit
);
2808 EXPORT_SYMBOL(dasd_debug_area
);
2809 EXPORT_SYMBOL(dasd_diag_discipline_pointer
);
2811 EXPORT_SYMBOL(dasd_add_request_head
);
2812 EXPORT_SYMBOL(dasd_add_request_tail
);
2813 EXPORT_SYMBOL(dasd_cancel_req
);
2814 EXPORT_SYMBOL(dasd_device_clear_timer
);
2815 EXPORT_SYMBOL(dasd_block_clear_timer
);
2816 EXPORT_SYMBOL(dasd_enable_device
);
2817 EXPORT_SYMBOL(dasd_int_handler
);
2818 EXPORT_SYMBOL(dasd_kfree_request
);
2819 EXPORT_SYMBOL(dasd_kick_device
);
2820 EXPORT_SYMBOL(dasd_kmalloc_request
);
2821 EXPORT_SYMBOL(dasd_schedule_device_bh
);
2822 EXPORT_SYMBOL(dasd_schedule_block_bh
);
2823 EXPORT_SYMBOL(dasd_set_target_state
);
2824 EXPORT_SYMBOL(dasd_device_set_timer
);
2825 EXPORT_SYMBOL(dasd_block_set_timer
);
2826 EXPORT_SYMBOL(dasd_sfree_request
);
2827 EXPORT_SYMBOL(dasd_sleep_on
);
2828 EXPORT_SYMBOL(dasd_sleep_on_immediatly
);
2829 EXPORT_SYMBOL(dasd_sleep_on_interruptible
);
2830 EXPORT_SYMBOL(dasd_smalloc_request
);
2831 EXPORT_SYMBOL(dasd_start_IO
);
2832 EXPORT_SYMBOL(dasd_term_IO
);
2834 EXPORT_SYMBOL_GPL(dasd_generic_probe
);
2835 EXPORT_SYMBOL_GPL(dasd_generic_remove
);
2836 EXPORT_SYMBOL_GPL(dasd_generic_notify
);
2837 EXPORT_SYMBOL_GPL(dasd_generic_set_online
);
2838 EXPORT_SYMBOL_GPL(dasd_generic_set_offline
);
2839 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change
);
2840 EXPORT_SYMBOL_GPL(dasd_flush_device_queue
);
2841 EXPORT_SYMBOL_GPL(dasd_alloc_block
);
2842 EXPORT_SYMBOL_GPL(dasd_free_block
);