2 * File...........: linux/drivers/s390/block/dasd.c
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
12 #include <linux/kmod.h>
13 #include <linux/init.h>
14 #include <linux/interrupt.h>
15 #include <linux/ctype.h>
16 #include <linux/major.h>
17 #include <linux/slab.h>
18 #include <linux/buffer_head.h>
19 #include <linux/hdreg.h>
21 #include <asm/ccwdev.h>
22 #include <asm/ebcdic.h>
23 #include <asm/idals.h>
24 #include <asm/todclk.h>
27 #define PRINTK_HEADER "dasd:"
31 * SECTION: Constant definitions to be used within this file
33 #define DASD_CHANQ_MAX_SIZE 4
36 * SECTION: exported variables of dasd.c
38 debug_info_t
*dasd_debug_area
;
39 struct dasd_discipline
*dasd_diag_discipline_pointer
;
41 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
42 MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
43 " Copyright 2000 IBM Corporation");
44 MODULE_SUPPORTED_DEVICE("dasd");
45 MODULE_LICENSE("GPL");
48 * SECTION: prototypes for static functions of dasd.c
50 static int dasd_alloc_queue(struct dasd_device
* device
);
51 static void dasd_setup_queue(struct dasd_device
* device
);
52 static void dasd_free_queue(struct dasd_device
* device
);
53 static void dasd_flush_request_queue(struct dasd_device
*);
54 static void dasd_int_handler(struct ccw_device
*, unsigned long, struct irb
*);
55 static int dasd_flush_ccw_queue(struct dasd_device
*, int);
56 static void dasd_tasklet(struct dasd_device
*);
57 static void do_kick_device(void *data
);
60 * SECTION: Operations on the device structure.
62 static wait_queue_head_t dasd_init_waitq
;
63 static wait_queue_head_t dasd_flush_wq
;
66 * Allocate memory for a new device structure.
69 dasd_alloc_device(void)
71 struct dasd_device
*device
;
73 device
= kzalloc(sizeof (struct dasd_device
), GFP_ATOMIC
);
75 return ERR_PTR(-ENOMEM
);
76 /* open_count = 0 means device online but not in use */
77 atomic_set(&device
->open_count
, -1);
79 /* Get two pages for normal block device operations. */
80 device
->ccw_mem
= (void *) __get_free_pages(GFP_ATOMIC
| GFP_DMA
, 1);
81 if (device
->ccw_mem
== NULL
) {
83 return ERR_PTR(-ENOMEM
);
85 /* Get one page for error recovery. */
86 device
->erp_mem
= (void *) get_zeroed_page(GFP_ATOMIC
| GFP_DMA
);
87 if (device
->erp_mem
== NULL
) {
88 free_pages((unsigned long) device
->ccw_mem
, 1);
90 return ERR_PTR(-ENOMEM
);
93 dasd_init_chunklist(&device
->ccw_chunks
, device
->ccw_mem
, PAGE_SIZE
*2);
94 dasd_init_chunklist(&device
->erp_chunks
, device
->erp_mem
, PAGE_SIZE
);
95 spin_lock_init(&device
->mem_lock
);
96 spin_lock_init(&device
->request_queue_lock
);
97 atomic_set (&device
->tasklet_scheduled
, 0);
98 tasklet_init(&device
->tasklet
,
99 (void (*)(unsigned long)) dasd_tasklet
,
100 (unsigned long) device
);
101 INIT_LIST_HEAD(&device
->ccw_queue
);
102 init_timer(&device
->timer
);
103 INIT_WORK(&device
->kick_work
, do_kick_device
, device
);
104 device
->state
= DASD_STATE_NEW
;
105 device
->target
= DASD_STATE_NEW
;
111 * Free memory of a device structure.
114 dasd_free_device(struct dasd_device
*device
)
116 kfree(device
->private);
117 free_page((unsigned long) device
->erp_mem
);
118 free_pages((unsigned long) device
->ccw_mem
, 1);
123 * Make a new device known to the system.
126 dasd_state_new_to_known(struct dasd_device
*device
)
131 * As long as the device is not in state DASD_STATE_NEW we want to
132 * keep the reference count > 0.
134 dasd_get_device(device
);
136 rc
= dasd_alloc_queue(device
);
138 dasd_put_device(device
);
142 device
->state
= DASD_STATE_KNOWN
;
147 * Let the system forget about a device.
150 dasd_state_known_to_new(struct dasd_device
* device
)
152 /* Disable extended error reporting for this device. */
153 dasd_eer_disable(device
);
154 /* Forget the discipline information. */
155 if (device
->discipline
)
156 module_put(device
->discipline
->owner
);
157 device
->discipline
= NULL
;
158 if (device
->base_discipline
)
159 module_put(device
->base_discipline
->owner
);
160 device
->base_discipline
= NULL
;
161 device
->state
= DASD_STATE_NEW
;
163 dasd_free_queue(device
);
165 /* Give up reference we took in dasd_state_new_to_known. */
166 dasd_put_device(device
);
171 * Request the irq line for the device.
174 dasd_state_known_to_basic(struct dasd_device
* device
)
178 /* Allocate and register gendisk structure. */
179 rc
= dasd_gendisk_alloc(device
);
183 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
184 device
->debug_area
= debug_register(device
->cdev
->dev
.bus_id
, 1, 2,
186 debug_register_view(device
->debug_area
, &debug_sprintf_view
);
187 debug_set_level(device
->debug_area
, DBF_WARNING
);
188 DBF_DEV_EVENT(DBF_EMERG
, device
, "%s", "debug area created");
190 device
->state
= DASD_STATE_BASIC
;
195 * Release the irq line for the device. Terminate any running i/o.
198 dasd_state_basic_to_known(struct dasd_device
* device
)
202 dasd_gendisk_free(device
);
203 rc
= dasd_flush_ccw_queue(device
, 1);
206 dasd_clear_timer(device
);
208 DBF_DEV_EVENT(DBF_EMERG
, device
, "%p debug area deleted", device
);
209 if (device
->debug_area
!= NULL
) {
210 debug_unregister(device
->debug_area
);
211 device
->debug_area
= NULL
;
213 device
->state
= DASD_STATE_KNOWN
;
218 * Do the initial analysis. The do_analysis function may return
219 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
220 * until the discipline decides to continue the startup sequence
221 * by calling the function dasd_change_state. The eckd disciplines
222 * uses this to start a ccw that detects the format. The completion
223 * interrupt for this detection ccw uses the kernel event daemon to
224 * trigger the call to dasd_change_state. All this is done in the
225 * discipline code, see dasd_eckd.c.
226 * After the analysis ccw is done (do_analysis returned 0) the block
228 * In case the analysis returns an error, the device setup is stopped
229 * (a fake disk was already added to allow formatting).
232 dasd_state_basic_to_ready(struct dasd_device
* device
)
237 if (device
->discipline
->do_analysis
!= NULL
)
238 rc
= device
->discipline
->do_analysis(device
);
241 device
->state
= DASD_STATE_UNFMT
;
244 /* make disk known with correct capacity */
245 dasd_setup_queue(device
);
246 set_capacity(device
->gdp
, device
->blocks
<< device
->s2b_shift
);
247 device
->state
= DASD_STATE_READY
;
248 rc
= dasd_scan_partitions(device
);
250 device
->state
= DASD_STATE_BASIC
;
255 * Remove device from block device layer. Destroy dirty buffers.
256 * Forget format information. Check if the target level is basic
257 * and if it is create fake disk for formatting.
260 dasd_state_ready_to_basic(struct dasd_device
* device
)
264 rc
= dasd_flush_ccw_queue(device
, 0);
267 dasd_destroy_partitions(device
);
268 dasd_flush_request_queue(device
);
270 device
->bp_block
= 0;
271 device
->s2b_shift
= 0;
272 device
->state
= DASD_STATE_BASIC
;
280 dasd_state_unfmt_to_basic(struct dasd_device
* device
)
282 device
->state
= DASD_STATE_BASIC
;
287 * Make the device online and schedule the bottom half to start
288 * the requeueing of requests from the linux request queue to the
292 dasd_state_ready_to_online(struct dasd_device
* device
)
294 device
->state
= DASD_STATE_ONLINE
;
295 dasd_schedule_bh(device
);
300 * Stop the requeueing of requests again.
303 dasd_state_online_to_ready(struct dasd_device
* device
)
305 device
->state
= DASD_STATE_READY
;
310 * Device startup state changes.
313 dasd_increase_state(struct dasd_device
*device
)
318 if (device
->state
== DASD_STATE_NEW
&&
319 device
->target
>= DASD_STATE_KNOWN
)
320 rc
= dasd_state_new_to_known(device
);
323 device
->state
== DASD_STATE_KNOWN
&&
324 device
->target
>= DASD_STATE_BASIC
)
325 rc
= dasd_state_known_to_basic(device
);
328 device
->state
== DASD_STATE_BASIC
&&
329 device
->target
>= DASD_STATE_READY
)
330 rc
= dasd_state_basic_to_ready(device
);
333 device
->state
== DASD_STATE_UNFMT
&&
334 device
->target
> DASD_STATE_UNFMT
)
338 device
->state
== DASD_STATE_READY
&&
339 device
->target
>= DASD_STATE_ONLINE
)
340 rc
= dasd_state_ready_to_online(device
);
346 * Device shutdown state changes.
349 dasd_decrease_state(struct dasd_device
*device
)
354 if (device
->state
== DASD_STATE_ONLINE
&&
355 device
->target
<= DASD_STATE_READY
)
356 rc
= dasd_state_online_to_ready(device
);
359 device
->state
== DASD_STATE_READY
&&
360 device
->target
<= DASD_STATE_BASIC
)
361 rc
= dasd_state_ready_to_basic(device
);
364 device
->state
== DASD_STATE_UNFMT
&&
365 device
->target
<= DASD_STATE_BASIC
)
366 rc
= dasd_state_unfmt_to_basic(device
);
369 device
->state
== DASD_STATE_BASIC
&&
370 device
->target
<= DASD_STATE_KNOWN
)
371 rc
= dasd_state_basic_to_known(device
);
374 device
->state
== DASD_STATE_KNOWN
&&
375 device
->target
<= DASD_STATE_NEW
)
376 rc
= dasd_state_known_to_new(device
);
382 * This is the main startup/shutdown routine.
385 dasd_change_state(struct dasd_device
*device
)
389 if (device
->state
== device
->target
)
390 /* Already where we want to go today... */
392 if (device
->state
< device
->target
)
393 rc
= dasd_increase_state(device
);
395 rc
= dasd_decrease_state(device
);
396 if (rc
&& rc
!= -EAGAIN
)
397 device
->target
= device
->state
;
399 if (device
->state
== device
->target
)
400 wake_up(&dasd_init_waitq
);
404 * Kick starter for devices that did not complete the startup/shutdown
405 * procedure or were sleeping because of a pending state.
406 * dasd_kick_device will schedule a call do do_kick_device to the kernel
410 do_kick_device(void *data
)
412 struct dasd_device
*device
;
414 device
= (struct dasd_device
*) data
;
415 dasd_change_state(device
);
416 dasd_schedule_bh(device
);
417 dasd_put_device(device
);
421 dasd_kick_device(struct dasd_device
*device
)
423 dasd_get_device(device
);
424 /* queue call to dasd_kick_device to the kernel event daemon. */
425 schedule_work(&device
->kick_work
);
429 * Set the target state for a device and starts the state change.
432 dasd_set_target_state(struct dasd_device
*device
, int target
)
434 /* If we are in probeonly mode stop at DASD_STATE_READY. */
435 if (dasd_probeonly
&& target
> DASD_STATE_READY
)
436 target
= DASD_STATE_READY
;
437 if (device
->target
!= target
) {
438 if (device
->state
== target
)
439 wake_up(&dasd_init_waitq
);
440 device
->target
= target
;
442 if (device
->state
!= device
->target
)
443 dasd_change_state(device
);
447 * Enable devices with device numbers in [from..to].
450 _wait_for_device(struct dasd_device
*device
)
452 return (device
->state
== device
->target
);
456 dasd_enable_device(struct dasd_device
*device
)
458 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
459 if (device
->state
<= DASD_STATE_KNOWN
)
460 /* No discipline for device found. */
461 dasd_set_target_state(device
, DASD_STATE_NEW
);
462 /* Now wait for the devices to come up. */
463 wait_event(dasd_init_waitq
, _wait_for_device(device
));
467 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
469 #ifdef CONFIG_DASD_PROFILE
471 struct dasd_profile_info_t dasd_global_profile
;
472 unsigned int dasd_profile_level
= DASD_PROFILE_OFF
;
475 * Increments counter in global and local profiling structures.
477 #define dasd_profile_counter(value, counter, device) \
480 for (index = 0; index < 31 && value >> (2+index); index++); \
481 dasd_global_profile.counter[index]++; \
482 device->profile.counter[index]++; \
486 * Add profiling information for cqr before execution.
489 dasd_profile_start(struct dasd_device
*device
, struct dasd_ccw_req
* cqr
,
493 unsigned int counter
;
495 if (dasd_profile_level
!= DASD_PROFILE_ON
)
498 /* count the length of the chanq for statistics */
500 list_for_each(l
, &device
->ccw_queue
)
503 dasd_global_profile
.dasd_io_nr_req
[counter
]++;
504 device
->profile
.dasd_io_nr_req
[counter
]++;
508 * Add profiling information for cqr after execution.
511 dasd_profile_end(struct dasd_device
*device
, struct dasd_ccw_req
* cqr
,
514 long strtime
, irqtime
, endtime
, tottime
; /* in microseconds */
515 long tottimeps
, sectors
;
517 if (dasd_profile_level
!= DASD_PROFILE_ON
)
520 sectors
= req
->nr_sectors
;
521 if (!cqr
->buildclk
|| !cqr
->startclk
||
522 !cqr
->stopclk
|| !cqr
->endclk
||
526 strtime
= ((cqr
->startclk
- cqr
->buildclk
) >> 12);
527 irqtime
= ((cqr
->stopclk
- cqr
->startclk
) >> 12);
528 endtime
= ((cqr
->endclk
- cqr
->stopclk
) >> 12);
529 tottime
= ((cqr
->endclk
- cqr
->buildclk
) >> 12);
530 tottimeps
= tottime
/ sectors
;
532 if (!dasd_global_profile
.dasd_io_reqs
)
533 memset(&dasd_global_profile
, 0,
534 sizeof (struct dasd_profile_info_t
));
535 dasd_global_profile
.dasd_io_reqs
++;
536 dasd_global_profile
.dasd_io_sects
+= sectors
;
538 if (!device
->profile
.dasd_io_reqs
)
539 memset(&device
->profile
, 0,
540 sizeof (struct dasd_profile_info_t
));
541 device
->profile
.dasd_io_reqs
++;
542 device
->profile
.dasd_io_sects
+= sectors
;
544 dasd_profile_counter(sectors
, dasd_io_secs
, device
);
545 dasd_profile_counter(tottime
, dasd_io_times
, device
);
546 dasd_profile_counter(tottimeps
, dasd_io_timps
, device
);
547 dasd_profile_counter(strtime
, dasd_io_time1
, device
);
548 dasd_profile_counter(irqtime
, dasd_io_time2
, device
);
549 dasd_profile_counter(irqtime
/ sectors
, dasd_io_time2ps
, device
);
550 dasd_profile_counter(endtime
, dasd_io_time3
, device
);
553 #define dasd_profile_start(device, cqr, req) do {} while (0)
554 #define dasd_profile_end(device, cqr, req) do {} while (0)
555 #endif /* CONFIG_DASD_PROFILE */
558 * Allocate memory for a channel program with 'cplength' channel
559 * command words and 'datasize' additional space. There are two
560 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
561 * memory and 2) dasd_smalloc_request uses the static ccw memory
562 * that gets allocated for each device.
564 struct dasd_ccw_req
*
565 dasd_kmalloc_request(char *magic
, int cplength
, int datasize
,
566 struct dasd_device
* device
)
568 struct dasd_ccw_req
*cqr
;
571 BUG_ON( magic
== NULL
|| datasize
> PAGE_SIZE
||
572 (cplength
*sizeof(struct ccw1
)) > PAGE_SIZE
);
574 cqr
= kzalloc(sizeof(struct dasd_ccw_req
), GFP_ATOMIC
);
576 return ERR_PTR(-ENOMEM
);
579 cqr
->cpaddr
= kcalloc(cplength
, sizeof(struct ccw1
),
580 GFP_ATOMIC
| GFP_DMA
);
581 if (cqr
->cpaddr
== NULL
) {
583 return ERR_PTR(-ENOMEM
);
588 cqr
->data
= kzalloc(datasize
, GFP_ATOMIC
| GFP_DMA
);
589 if (cqr
->data
== NULL
) {
592 return ERR_PTR(-ENOMEM
);
595 strncpy((char *) &cqr
->magic
, magic
, 4);
596 ASCEBC((char *) &cqr
->magic
, 4);
597 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
598 dasd_get_device(device
);
602 struct dasd_ccw_req
*
603 dasd_smalloc_request(char *magic
, int cplength
, int datasize
,
604 struct dasd_device
* device
)
607 struct dasd_ccw_req
*cqr
;
612 BUG_ON( magic
== NULL
|| datasize
> PAGE_SIZE
||
613 (cplength
*sizeof(struct ccw1
)) > PAGE_SIZE
);
615 size
= (sizeof(struct dasd_ccw_req
) + 7L) & -8L;
617 size
+= cplength
* sizeof(struct ccw1
);
620 spin_lock_irqsave(&device
->mem_lock
, flags
);
621 cqr
= (struct dasd_ccw_req
*)
622 dasd_alloc_chunk(&device
->ccw_chunks
, size
);
623 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
625 return ERR_PTR(-ENOMEM
);
626 memset(cqr
, 0, sizeof(struct dasd_ccw_req
));
627 data
= (char *) cqr
+ ((sizeof(struct dasd_ccw_req
) + 7L) & -8L);
630 cqr
->cpaddr
= (struct ccw1
*) data
;
631 data
+= cplength
*sizeof(struct ccw1
);
632 memset(cqr
->cpaddr
, 0, cplength
*sizeof(struct ccw1
));
637 memset(cqr
->data
, 0, datasize
);
639 strncpy((char *) &cqr
->magic
, magic
, 4);
640 ASCEBC((char *) &cqr
->magic
, 4);
641 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
642 dasd_get_device(device
);
647 * Free memory of a channel program. This function needs to free all the
648 * idal lists that might have been created by dasd_set_cda and the
649 * struct dasd_ccw_req itself.
652 dasd_kfree_request(struct dasd_ccw_req
* cqr
, struct dasd_device
* device
)
657 /* Clear any idals used for the request. */
660 clear_normalized_cda(ccw
);
661 } while (ccw
++->flags
& (CCW_FLAG_CC
| CCW_FLAG_DC
));
666 dasd_put_device(device
);
670 dasd_sfree_request(struct dasd_ccw_req
* cqr
, struct dasd_device
* device
)
674 spin_lock_irqsave(&device
->mem_lock
, flags
);
675 dasd_free_chunk(&device
->ccw_chunks
, cqr
);
676 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
677 dasd_put_device(device
);
681 * Check discipline magic in cqr.
684 dasd_check_cqr(struct dasd_ccw_req
*cqr
)
686 struct dasd_device
*device
;
690 device
= cqr
->device
;
691 if (strncmp((char *) &cqr
->magic
, device
->discipline
->ebcname
, 4)) {
692 DEV_MESSAGE(KERN_WARNING
, device
,
693 " dasd_ccw_req 0x%08x magic doesn't match"
694 " discipline 0x%08x",
696 *(unsigned int *) device
->discipline
->name
);
703 * Terminate the current i/o and set the request to clear_pending.
704 * Timer keeps device runnig.
705 * ccw_device_clear can fail if the i/o subsystem
709 dasd_term_IO(struct dasd_ccw_req
* cqr
)
711 struct dasd_device
*device
;
715 rc
= dasd_check_cqr(cqr
);
719 device
= (struct dasd_device
*) cqr
->device
;
720 while ((retries
< 5) && (cqr
->status
== DASD_CQR_IN_IO
)) {
721 rc
= ccw_device_clear(device
->cdev
, (long) cqr
);
723 case 0: /* termination successful */
725 cqr
->status
= DASD_CQR_CLEAR
;
726 cqr
->stopclk
= get_clock();
728 DBF_DEV_EVENT(DBF_DEBUG
, device
,
729 "terminate cqr %p successful",
733 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
734 "device gone, retry");
737 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
742 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
743 "device busy, retry later");
746 DEV_MESSAGE(KERN_ERR
, device
,
747 "line %d unknown RC=%d, please "
748 "report to linux390@de.ibm.com",
755 dasd_schedule_bh(device
);
760 * Start the i/o. This start_IO can fail if the channel is really busy.
761 * In that case set up a timer to start the request later.
764 dasd_start_IO(struct dasd_ccw_req
* cqr
)
766 struct dasd_device
*device
;
770 rc
= dasd_check_cqr(cqr
);
773 device
= (struct dasd_device
*) cqr
->device
;
774 if (cqr
->retries
< 0) {
775 DEV_MESSAGE(KERN_DEBUG
, device
,
776 "start_IO: request %p (%02x/%i) - no retry left.",
777 cqr
, cqr
->status
, cqr
->retries
);
778 cqr
->status
= DASD_CQR_FAILED
;
781 cqr
->startclk
= get_clock();
782 cqr
->starttime
= jiffies
;
784 rc
= ccw_device_start(device
->cdev
, cqr
->cpaddr
, (long) cqr
,
788 cqr
->status
= DASD_CQR_IN_IO
;
789 DBF_DEV_EVENT(DBF_DEBUG
, device
,
790 "start_IO: request %p started successful",
794 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
795 "start_IO: device busy, retry later");
798 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
799 "start_IO: request timeout, retry later");
802 /* -EACCES indicates that the request used only a
803 * subset of the available pathes and all these
805 * Do a retry with all available pathes.
807 cqr
->lpm
= LPM_ANYPATH
;
808 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
809 "start_IO: selected pathes gone,"
810 " retry on all pathes");
814 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
815 "start_IO: device gone, retry");
818 DEV_MESSAGE(KERN_ERR
, device
,
819 "line %d unknown RC=%d, please report"
820 " to linux390@de.ibm.com", __LINE__
, rc
);
828 * Timeout function for dasd devices. This is used for different purposes
829 * 1) missing interrupt handler for normal operation
830 * 2) delayed start of request where start_IO failed with -EBUSY
831 * 3) timeout for missing state change interrupts
832 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
833 * DASD_CQR_QUEUED for 2) and 3).
836 dasd_timeout_device(unsigned long ptr
)
839 struct dasd_device
*device
;
841 device
= (struct dasd_device
*) ptr
;
842 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
843 /* re-activate request queue */
844 device
->stopped
&= ~DASD_STOPPED_PENDING
;
845 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
846 dasd_schedule_bh(device
);
850 * Setup timeout for a device in jiffies.
853 dasd_set_timer(struct dasd_device
*device
, int expires
)
856 if (timer_pending(&device
->timer
))
857 del_timer(&device
->timer
);
860 if (timer_pending(&device
->timer
)) {
861 if (mod_timer(&device
->timer
, jiffies
+ expires
))
864 device
->timer
.function
= dasd_timeout_device
;
865 device
->timer
.data
= (unsigned long) device
;
866 device
->timer
.expires
= jiffies
+ expires
;
867 add_timer(&device
->timer
);
871 * Clear timeout for a device.
874 dasd_clear_timer(struct dasd_device
*device
)
876 if (timer_pending(&device
->timer
))
877 del_timer(&device
->timer
);
881 dasd_handle_killed_request(struct ccw_device
*cdev
, unsigned long intparm
)
883 struct dasd_ccw_req
*cqr
;
884 struct dasd_device
*device
;
886 cqr
= (struct dasd_ccw_req
*) intparm
;
887 if (cqr
->status
!= DASD_CQR_IN_IO
) {
889 "invalid status in handle_killed_request: "
890 "bus_id %s, status %02x",
891 cdev
->dev
.bus_id
, cqr
->status
);
895 device
= (struct dasd_device
*) cqr
->device
;
896 if (device
== NULL
||
897 device
!= dasd_device_from_cdev_locked(cdev
) ||
898 strncmp(device
->discipline
->ebcname
, (char *) &cqr
->magic
, 4)) {
899 MESSAGE(KERN_DEBUG
, "invalid device in request: bus_id %s",
904 /* Schedule request to be retried. */
905 cqr
->status
= DASD_CQR_QUEUED
;
907 dasd_clear_timer(device
);
908 dasd_schedule_bh(device
);
909 dasd_put_device(device
);
913 dasd_handle_state_change_pending(struct dasd_device
*device
)
915 struct dasd_ccw_req
*cqr
;
916 struct list_head
*l
, *n
;
918 /* First of all start sense subsystem status request. */
919 dasd_eer_snss(device
);
921 device
->stopped
&= ~DASD_STOPPED_PENDING
;
923 /* restart all 'running' IO on queue */
924 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
925 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
926 if (cqr
->status
== DASD_CQR_IN_IO
) {
927 cqr
->status
= DASD_CQR_QUEUED
;
930 dasd_clear_timer(device
);
931 dasd_schedule_bh(device
);
935 * Interrupt handler for "normal" ssch-io based dasd devices.
938 dasd_int_handler(struct ccw_device
*cdev
, unsigned long intparm
,
941 struct dasd_ccw_req
*cqr
, *next
;
942 struct dasd_device
*device
;
943 unsigned long long now
;
949 switch (PTR_ERR(irb
)) {
951 dasd_handle_killed_request(cdev
, intparm
);
954 printk(KERN_WARNING
"%s(%s): request timed out\n",
955 __FUNCTION__
, cdev
->dev
.bus_id
);
956 //FIXME - dasd uses own timeout interface...
959 printk(KERN_WARNING
"%s(%s): unknown error %ld\n",
960 __FUNCTION__
, cdev
->dev
.bus_id
, PTR_ERR(irb
));
967 DBF_EVENT(DBF_ERR
, "Interrupt: bus_id %s CS/DS %04x ip %08x",
968 cdev
->dev
.bus_id
, ((irb
->scsw
.cstat
<<8)|irb
->scsw
.dstat
),
969 (unsigned int) intparm
);
971 /* first of all check for state change pending interrupt */
972 mask
= DEV_STAT_ATTENTION
| DEV_STAT_DEV_END
| DEV_STAT_UNIT_EXCEP
;
973 if ((irb
->scsw
.dstat
& mask
) == mask
) {
974 device
= dasd_device_from_cdev_locked(cdev
);
975 if (!IS_ERR(device
)) {
976 dasd_handle_state_change_pending(device
);
977 dasd_put_device(device
);
982 cqr
= (struct dasd_ccw_req
*) intparm
;
984 /* check for unsolicited interrupts */
987 "unsolicited interrupt received: bus_id %s",
992 device
= (struct dasd_device
*) cqr
->device
;
993 if (device
== NULL
||
994 strncmp(device
->discipline
->ebcname
, (char *) &cqr
->magic
, 4)) {
995 MESSAGE(KERN_DEBUG
, "invalid device in request: bus_id %s",
1000 /* Check for clear pending */
1001 if (cqr
->status
== DASD_CQR_CLEAR
&&
1002 irb
->scsw
.fctl
& SCSW_FCTL_CLEAR_FUNC
) {
1003 cqr
->status
= DASD_CQR_QUEUED
;
1004 dasd_clear_timer(device
);
1005 wake_up(&dasd_flush_wq
);
1006 dasd_schedule_bh(device
);
1010 /* check status - the request might have been killed by dyn detach */
1011 if (cqr
->status
!= DASD_CQR_IN_IO
) {
1013 "invalid status: bus_id %s, status %02x",
1014 cdev
->dev
.bus_id
, cqr
->status
);
1017 DBF_DEV_EVENT(DBF_DEBUG
, device
, "Int: CS/DS 0x%04x for cqr %p",
1018 ((irb
->scsw
.cstat
<< 8) | irb
->scsw
.dstat
), cqr
);
1020 /* Find out the appropriate era_action. */
1021 if (irb
->scsw
.fctl
& SCSW_FCTL_HALT_FUNC
)
1022 era
= dasd_era_fatal
;
1023 else if (irb
->scsw
.dstat
== (DEV_STAT_CHN_END
| DEV_STAT_DEV_END
) &&
1024 irb
->scsw
.cstat
== 0 &&
1025 !irb
->esw
.esw0
.erw
.cons
)
1026 era
= dasd_era_none
;
1027 else if (!test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
))
1028 era
= dasd_era_fatal
; /* don't recover this request */
1029 else if (irb
->esw
.esw0
.erw
.cons
)
1030 era
= device
->discipline
->examine_error(cqr
, irb
);
1032 era
= dasd_era_recover
;
1034 DBF_DEV_EVENT(DBF_DEBUG
, device
, "era_code %d", era
);
1036 if (era
== dasd_era_none
) {
1037 cqr
->status
= DASD_CQR_DONE
;
1039 /* Start first request on queue if possible -> fast_io. */
1040 if (cqr
->list
.next
!= &device
->ccw_queue
) {
1041 next
= list_entry(cqr
->list
.next
,
1042 struct dasd_ccw_req
, list
);
1043 if ((next
->status
== DASD_CQR_QUEUED
) &&
1044 (!device
->stopped
)) {
1045 if (device
->discipline
->start_IO(next
) == 0)
1046 expires
= next
->expires
;
1048 DEV_MESSAGE(KERN_DEBUG
, device
, "%s",
1049 "Interrupt fastpath "
1053 } else { /* error */
1054 memcpy(&cqr
->irb
, irb
, sizeof (struct irb
));
1056 /* dump sense data */
1057 dasd_log_sense(cqr
, irb
);
1060 case dasd_era_fatal
:
1061 cqr
->status
= DASD_CQR_FAILED
;
1064 case dasd_era_recover
:
1065 cqr
->status
= DASD_CQR_ERROR
;
1072 dasd_set_timer(device
, expires
);
1074 dasd_clear_timer(device
);
1075 dasd_schedule_bh(device
);
1079 * posts the buffer_cache about a finalized request
1082 dasd_end_request(struct request
*req
, int uptodate
)
1084 if (end_that_request_first(req
, uptodate
, req
->hard_nr_sectors
))
1086 add_disk_randomness(req
->rq_disk
);
1087 end_that_request_last(req
, uptodate
);
1091 * Process finished error recovery ccw.
1094 __dasd_process_erp(struct dasd_device
*device
, struct dasd_ccw_req
*cqr
)
1096 dasd_erp_fn_t erp_fn
;
1098 if (cqr
->status
== DASD_CQR_DONE
)
1099 DBF_DEV_EVENT(DBF_NOTICE
, device
, "%s", "ERP successful");
1101 DEV_MESSAGE(KERN_ERR
, device
, "%s", "ERP unsuccessful");
1102 erp_fn
= device
->discipline
->erp_postaction(cqr
);
1107 * Process ccw request queue.
1110 __dasd_process_ccw_queue(struct dasd_device
* device
,
1111 struct list_head
*final_queue
)
1113 struct list_head
*l
, *n
;
1114 struct dasd_ccw_req
*cqr
;
1115 dasd_erp_fn_t erp_fn
;
1118 /* Process request with final status. */
1119 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1120 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
1121 /* Stop list processing at the first non-final request. */
1122 if (cqr
->status
!= DASD_CQR_DONE
&&
1123 cqr
->status
!= DASD_CQR_FAILED
&&
1124 cqr
->status
!= DASD_CQR_ERROR
)
1126 /* Process requests with DASD_CQR_ERROR */
1127 if (cqr
->status
== DASD_CQR_ERROR
) {
1128 if (cqr
->irb
.scsw
.fctl
& SCSW_FCTL_HALT_FUNC
) {
1129 cqr
->status
= DASD_CQR_FAILED
;
1130 cqr
->stopclk
= get_clock();
1132 if (cqr
->irb
.esw
.esw0
.erw
.cons
) {
1133 erp_fn
= device
->discipline
->
1137 dasd_default_erp_action(cqr
);
1142 /* First of all call extended error reporting. */
1143 if (dasd_eer_enabled(device
) &&
1144 cqr
->status
== DASD_CQR_FAILED
) {
1145 dasd_eer_write(device
, cqr
, DASD_EER_FATALERROR
);
1147 /* restart request */
1148 cqr
->status
= DASD_CQR_QUEUED
;
1150 device
->stopped
|= DASD_STOPPED_QUIESCE
;
1154 /* Process finished ERP request. */
1156 __dasd_process_erp(device
, cqr
);
1160 /* Rechain finished requests to final queue */
1161 cqr
->endclk
= get_clock();
1162 list_move_tail(&cqr
->list
, final_queue
);
1167 dasd_end_request_cb(struct dasd_ccw_req
* cqr
, void *data
)
1169 struct request
*req
;
1170 struct dasd_device
*device
;
1173 req
= (struct request
*) data
;
1174 device
= cqr
->device
;
1175 dasd_profile_end(device
, cqr
, req
);
1176 status
= cqr
->device
->discipline
->free_cp(cqr
,req
);
1177 spin_lock_irq(&device
->request_queue_lock
);
1178 dasd_end_request(req
, status
);
1179 spin_unlock_irq(&device
->request_queue_lock
);
1184 * Fetch requests from the block device queue.
1187 __dasd_process_blk_queue(struct dasd_device
* device
)
1189 request_queue_t
*queue
;
1190 struct request
*req
;
1191 struct dasd_ccw_req
*cqr
;
1194 queue
= device
->request_queue
;
1195 /* No queue ? Then there is nothing to do. */
1200 * We requeue request from the block device queue to the ccw
1201 * queue only in two states. In state DASD_STATE_READY the
1202 * partition detection is done and we need to requeue requests
1203 * for that. State DASD_STATE_ONLINE is normal block device
1206 if (device
->state
!= DASD_STATE_READY
&&
1207 device
->state
!= DASD_STATE_ONLINE
)
1210 /* Now we try to fetch requests from the request queue */
1211 list_for_each_entry(cqr
, &device
->ccw_queue
, list
)
1212 if (cqr
->status
== DASD_CQR_QUEUED
)
1214 while (!blk_queue_plugged(queue
) &&
1215 elv_next_request(queue
) &&
1216 nr_queued
< DASD_CHANQ_MAX_SIZE
) {
1217 req
= elv_next_request(queue
);
1219 if (device
->features
& DASD_FEATURE_READONLY
&&
1220 rq_data_dir(req
) == WRITE
) {
1221 DBF_DEV_EVENT(DBF_ERR
, device
,
1222 "Rejecting write request %p",
1224 blkdev_dequeue_request(req
);
1225 dasd_end_request(req
, 0);
1228 if (device
->stopped
& DASD_STOPPED_DC_EIO
) {
1229 blkdev_dequeue_request(req
);
1230 dasd_end_request(req
, 0);
1233 cqr
= device
->discipline
->build_cp(device
, req
);
1235 if (PTR_ERR(cqr
) == -ENOMEM
)
1236 break; /* terminate request queue loop */
1237 DBF_DEV_EVENT(DBF_ERR
, device
,
1238 "CCW creation failed (rc=%ld) "
1241 blkdev_dequeue_request(req
);
1242 dasd_end_request(req
, 0);
1245 cqr
->callback
= dasd_end_request_cb
;
1246 cqr
->callback_data
= (void *) req
;
1247 cqr
->status
= DASD_CQR_QUEUED
;
1248 blkdev_dequeue_request(req
);
1249 list_add_tail(&cqr
->list
, &device
->ccw_queue
);
1250 dasd_profile_start(device
, cqr
, req
);
1256 * Take a look at the first request on the ccw queue and check
1257 * if it reached its expire time. If so, terminate the IO.
1260 __dasd_check_expire(struct dasd_device
* device
)
1262 struct dasd_ccw_req
*cqr
;
1264 if (list_empty(&device
->ccw_queue
))
1266 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, list
);
1267 if (cqr
->status
== DASD_CQR_IN_IO
&& cqr
->expires
!= 0) {
1268 if (time_after_eq(jiffies
, cqr
->expires
+ cqr
->starttime
)) {
1269 DEV_MESSAGE(KERN_ERR
, device
,
1270 "internal error - timeout (%is) expired "
1271 "for cqr %p (%i retries left)",
1272 (cqr
->expires
/HZ
), cqr
, cqr
->retries
);
1273 if (device
->discipline
->term_IO(cqr
) != 0)
1274 /* Hmpf, try again in 1/10 sec */
1275 dasd_set_timer(device
, 10);
1281 * Take a look at the first request on the ccw queue and check
1282 * if it needs to be started.
1285 __dasd_start_head(struct dasd_device
* device
)
1287 struct dasd_ccw_req
*cqr
;
1290 if (list_empty(&device
->ccw_queue
))
1292 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, list
);
1293 if (cqr
->status
!= DASD_CQR_QUEUED
)
1295 /* Non-temporary stop condition will trigger fail fast */
1296 if (device
->stopped
& ~DASD_STOPPED_PENDING
&&
1297 test_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
) &&
1298 (!dasd_eer_enabled(device
))) {
1299 cqr
->status
= DASD_CQR_FAILED
;
1300 dasd_schedule_bh(device
);
1303 /* Don't try to start requests if device is stopped */
1304 if (device
->stopped
)
1307 rc
= device
->discipline
->start_IO(cqr
);
1309 dasd_set_timer(device
, cqr
->expires
);
1310 else if (rc
== -EACCES
) {
1311 dasd_schedule_bh(device
);
1313 /* Hmpf, try again in 1/2 sec */
1314 dasd_set_timer(device
, 50);
1318 _wait_for_clear(struct dasd_ccw_req
*cqr
)
1320 return (cqr
->status
== DASD_CQR_QUEUED
);
1324 * Remove all requests from the ccw queue (all = '1') or only block device
1325 * requests in case all = '0'.
1326 * Take care of the erp-chain (chained via cqr->refers) and remove either
1327 * the whole erp-chain or none of the erp-requests.
1328 * If a request is currently running, term_IO is called and the request
1329 * is re-queued. Prior to removing the terminated request we need to wait
1330 * for the clear-interrupt.
1331 * In case termination is not possible we stop processing and just finishing
1332 * the already moved requests.
1335 dasd_flush_ccw_queue(struct dasd_device
* device
, int all
)
1337 struct dasd_ccw_req
*cqr
, *orig
, *n
;
1340 struct list_head flush_queue
;
1342 INIT_LIST_HEAD(&flush_queue
);
1343 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1346 list_for_each_entry_safe(cqr
, n
, &device
->ccw_queue
, list
) {
1347 /* get original request of erp request-chain */
1348 for (orig
= cqr
; orig
->refers
!= NULL
; orig
= orig
->refers
);
1350 /* Flush all request or only block device requests? */
1351 if (all
== 0 && cqr
->callback
!= dasd_end_request_cb
&&
1352 orig
->callback
!= dasd_end_request_cb
) {
1355 /* Check status and move request to flush_queue */
1356 switch (cqr
->status
) {
1357 case DASD_CQR_IN_IO
:
1358 rc
= device
->discipline
->term_IO(cqr
);
1360 /* unable to terminate requeust */
1361 DEV_MESSAGE(KERN_ERR
, device
,
1362 "dasd flush ccw_queue is unable "
1363 " to terminate request %p",
1365 /* stop flush processing */
1369 case DASD_CQR_QUEUED
:
1370 case DASD_CQR_ERROR
:
1371 /* set request to FAILED */
1372 cqr
->stopclk
= get_clock();
1373 cqr
->status
= DASD_CQR_FAILED
;
1375 default: /* do not touch the others */
1378 /* Rechain request (including erp chain) */
1379 for (i
= 0; cqr
!= NULL
; cqr
= cqr
->refers
, i
++) {
1380 cqr
->endclk
= get_clock();
1381 list_move_tail(&cqr
->list
, &flush_queue
);
1384 /* moved more than one request - need to restart */
1389 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1390 /* Now call the callback function of flushed requests */
1392 list_for_each_entry_safe(cqr
, n
, &flush_queue
, list
) {
1393 if (cqr
->status
== DASD_CQR_CLEAR
) {
1394 /* wait for clear interrupt! */
1395 wait_event(dasd_flush_wq
, _wait_for_clear(cqr
));
1396 cqr
->status
= DASD_CQR_FAILED
;
1398 /* Process finished ERP request. */
1400 __dasd_process_erp(device
, cqr
);
1401 /* restart list_for_xx loop since dasd_process_erp
1402 * might remove multiple elements */
1405 /* call the callback function */
1406 cqr
->endclk
= get_clock();
1407 if (cqr
->callback
!= NULL
)
1408 (cqr
->callback
)(cqr
, cqr
->callback_data
);
1414 * Acquire the device lock and process queues for the device.
1417 dasd_tasklet(struct dasd_device
* device
)
1419 struct list_head final_queue
;
1420 struct list_head
*l
, *n
;
1421 struct dasd_ccw_req
*cqr
;
1423 atomic_set (&device
->tasklet_scheduled
, 0);
1424 INIT_LIST_HEAD(&final_queue
);
1425 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1426 /* Check expire time of first request on the ccw queue. */
1427 __dasd_check_expire(device
);
1428 /* Finish off requests on ccw queue */
1429 __dasd_process_ccw_queue(device
, &final_queue
);
1430 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1431 /* Now call the callback function of requests with final status */
1432 list_for_each_safe(l
, n
, &final_queue
) {
1433 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
1434 list_del_init(&cqr
->list
);
1435 if (cqr
->callback
!= NULL
)
1436 (cqr
->callback
)(cqr
, cqr
->callback_data
);
1438 spin_lock_irq(&device
->request_queue_lock
);
1439 spin_lock(get_ccwdev_lock(device
->cdev
));
1440 /* Get new request from the block device request queue */
1441 __dasd_process_blk_queue(device
);
1442 /* Now check if the head of the ccw queue needs to be started. */
1443 __dasd_start_head(device
);
1444 spin_unlock(get_ccwdev_lock(device
->cdev
));
1445 spin_unlock_irq(&device
->request_queue_lock
);
1446 dasd_put_device(device
);
1450 * Schedules a call to dasd_tasklet over the device tasklet.
1453 dasd_schedule_bh(struct dasd_device
* device
)
1455 /* Protect against rescheduling. */
1456 if (atomic_cmpxchg (&device
->tasklet_scheduled
, 0, 1) != 0)
1458 dasd_get_device(device
);
1459 tasklet_hi_schedule(&device
->tasklet
);
1463 * Queue a request to the head of the ccw_queue. Start the I/O if
1467 dasd_add_request_head(struct dasd_ccw_req
*req
)
1469 struct dasd_device
*device
;
1470 unsigned long flags
;
1472 device
= req
->device
;
1473 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1474 req
->status
= DASD_CQR_QUEUED
;
1475 req
->device
= device
;
1476 list_add(&req
->list
, &device
->ccw_queue
);
1477 /* let the bh start the request to keep them in order */
1478 dasd_schedule_bh(device
);
1479 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1483 * Queue a request to the tail of the ccw_queue. Start the I/O if
1487 dasd_add_request_tail(struct dasd_ccw_req
*req
)
1489 struct dasd_device
*device
;
1490 unsigned long flags
;
1492 device
= req
->device
;
1493 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1494 req
->status
= DASD_CQR_QUEUED
;
1495 req
->device
= device
;
1496 list_add_tail(&req
->list
, &device
->ccw_queue
);
1497 /* let the bh start the request to keep them in order */
1498 dasd_schedule_bh(device
);
1499 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1506 dasd_wakeup_cb(struct dasd_ccw_req
*cqr
, void *data
)
1508 wake_up((wait_queue_head_t
*) data
);
1512 _wait_for_wakeup(struct dasd_ccw_req
*cqr
)
1514 struct dasd_device
*device
;
1517 device
= cqr
->device
;
1518 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1519 rc
= ((cqr
->status
== DASD_CQR_DONE
||
1520 cqr
->status
== DASD_CQR_FAILED
) &&
1521 list_empty(&cqr
->list
));
1522 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1527 * Attempts to start a special ccw queue and waits for its completion.
1530 dasd_sleep_on(struct dasd_ccw_req
* cqr
)
1532 wait_queue_head_t wait_q
;
1533 struct dasd_device
*device
;
1536 device
= cqr
->device
;
1537 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1539 init_waitqueue_head (&wait_q
);
1540 cqr
->callback
= dasd_wakeup_cb
;
1541 cqr
->callback_data
= (void *) &wait_q
;
1542 cqr
->status
= DASD_CQR_QUEUED
;
1543 list_add_tail(&cqr
->list
, &device
->ccw_queue
);
1545 /* let the bh start the request to keep them in order */
1546 dasd_schedule_bh(device
);
1548 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1550 wait_event(wait_q
, _wait_for_wakeup(cqr
));
1552 /* Request status is either done or failed. */
1553 rc
= (cqr
->status
== DASD_CQR_FAILED
) ? -EIO
: 0;
1558 * Attempts to start a special ccw queue and wait interruptible
1559 * for its completion.
1562 dasd_sleep_on_interruptible(struct dasd_ccw_req
* cqr
)
1564 wait_queue_head_t wait_q
;
1565 struct dasd_device
*device
;
1568 device
= cqr
->device
;
1569 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1571 init_waitqueue_head (&wait_q
);
1572 cqr
->callback
= dasd_wakeup_cb
;
1573 cqr
->callback_data
= (void *) &wait_q
;
1574 cqr
->status
= DASD_CQR_QUEUED
;
1575 list_add_tail(&cqr
->list
, &device
->ccw_queue
);
1577 /* let the bh start the request to keep them in order */
1578 dasd_schedule_bh(device
);
1579 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1583 rc
= wait_event_interruptible(wait_q
, _wait_for_wakeup(cqr
));
1584 if (rc
!= -ERESTARTSYS
) {
1585 /* Request is final (done or failed) */
1586 rc
= (cqr
->status
== DASD_CQR_DONE
) ? 0 : -EIO
;
1589 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1590 switch (cqr
->status
) {
1591 case DASD_CQR_IN_IO
:
1592 /* terminate runnig cqr */
1593 if (device
->discipline
->term_IO
) {
1595 device
->discipline
->term_IO(cqr
);
1596 /* wait (non-interruptible) for final status
1597 * because signal ist still pending */
1598 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1599 wait_event(wait_q
, _wait_for_wakeup(cqr
));
1600 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1601 rc
= (cqr
->status
== DASD_CQR_DONE
) ? 0 : -EIO
;
1605 case DASD_CQR_QUEUED
:
1607 list_del_init(&cqr
->list
);
1612 /* cqr with 'non-interruptable' status - just wait */
1615 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1621 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
1622 * for eckd devices) the currently running request has to be terminated
1623 * and be put back to status queued, before the special request is added
1624 * to the head of the queue. Then the special request is waited on normally.
1627 _dasd_term_running_cqr(struct dasd_device
*device
)
1629 struct dasd_ccw_req
*cqr
;
1631 if (list_empty(&device
->ccw_queue
))
1633 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, list
);
1634 return device
->discipline
->term_IO(cqr
);
1638 dasd_sleep_on_immediatly(struct dasd_ccw_req
* cqr
)
1640 wait_queue_head_t wait_q
;
1641 struct dasd_device
*device
;
1644 device
= cqr
->device
;
1645 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1646 rc
= _dasd_term_running_cqr(device
);
1648 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1652 init_waitqueue_head (&wait_q
);
1653 cqr
->callback
= dasd_wakeup_cb
;
1654 cqr
->callback_data
= (void *) &wait_q
;
1655 cqr
->status
= DASD_CQR_QUEUED
;
1656 list_add(&cqr
->list
, &device
->ccw_queue
);
1658 /* let the bh start the request to keep them in order */
1659 dasd_schedule_bh(device
);
1661 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1663 wait_event(wait_q
, _wait_for_wakeup(cqr
));
1665 /* Request status is either done or failed. */
1666 rc
= (cqr
->status
== DASD_CQR_FAILED
) ? -EIO
: 0;
1671 * Cancels a request that was started with dasd_sleep_on_req.
1672 * This is useful to timeout requests. The request will be
1673 * terminated if it is currently in i/o.
1674 * Returns 1 if the request has been terminated.
1677 dasd_cancel_req(struct dasd_ccw_req
*cqr
)
1679 struct dasd_device
*device
= cqr
->device
;
1680 unsigned long flags
;
1684 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1685 switch (cqr
->status
) {
1686 case DASD_CQR_QUEUED
:
1687 /* request was not started - just set to failed */
1688 cqr
->status
= DASD_CQR_FAILED
;
1690 case DASD_CQR_IN_IO
:
1691 /* request in IO - terminate IO and release again */
1692 if (device
->discipline
->term_IO(cqr
) != 0)
1693 /* what to do if unable to terminate ??????
1695 cqr
->status
= DASD_CQR_FAILED
;
1696 cqr
->stopclk
= get_clock();
1700 case DASD_CQR_FAILED
:
1701 /* already finished - do nothing */
1704 DEV_MESSAGE(KERN_ALERT
, device
,
1705 "invalid status %02x in request",
1710 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1711 dasd_schedule_bh(device
);
1716 * SECTION: Block device operations (request queue, partitions, open, release).
1720 * Dasd request queue function. Called from ll_rw_blk.c
1723 do_dasd_request(request_queue_t
* queue
)
1725 struct dasd_device
*device
;
1727 device
= (struct dasd_device
*) queue
->queuedata
;
1728 spin_lock(get_ccwdev_lock(device
->cdev
));
1729 /* Get new request from the block device request queue */
1730 __dasd_process_blk_queue(device
);
1731 /* Now check if the head of the ccw queue needs to be started. */
1732 __dasd_start_head(device
);
1733 spin_unlock(get_ccwdev_lock(device
->cdev
));
1737 * Allocate and initialize request queue and default I/O scheduler.
1740 dasd_alloc_queue(struct dasd_device
* device
)
1744 device
->request_queue
= blk_init_queue(do_dasd_request
,
1745 &device
->request_queue_lock
);
1746 if (device
->request_queue
== NULL
)
1749 device
->request_queue
->queuedata
= device
;
1751 elevator_exit(device
->request_queue
->elevator
);
1752 rc
= elevator_init(device
->request_queue
, "deadline");
1754 blk_cleanup_queue(device
->request_queue
);
1761 * Allocate and initialize request queue.
1764 dasd_setup_queue(struct dasd_device
* device
)
1768 blk_queue_hardsect_size(device
->request_queue
, device
->bp_block
);
1769 max
= device
->discipline
->max_blocks
<< device
->s2b_shift
;
1770 blk_queue_max_sectors(device
->request_queue
, max
);
1771 blk_queue_max_phys_segments(device
->request_queue
, -1L);
1772 blk_queue_max_hw_segments(device
->request_queue
, -1L);
1773 blk_queue_max_segment_size(device
->request_queue
, -1L);
1774 blk_queue_segment_boundary(device
->request_queue
, -1L);
1775 blk_queue_ordered(device
->request_queue
, QUEUE_ORDERED_TAG
, NULL
);
1779 * Deactivate and free request queue.
1782 dasd_free_queue(struct dasd_device
* device
)
1784 if (device
->request_queue
) {
1785 blk_cleanup_queue(device
->request_queue
);
1786 device
->request_queue
= NULL
;
1791 * Flush request on the request queue.
1794 dasd_flush_request_queue(struct dasd_device
* device
)
1796 struct request
*req
;
1798 if (!device
->request_queue
)
1801 spin_lock_irq(&device
->request_queue_lock
);
1802 while ((req
= elv_next_request(device
->request_queue
))) {
1803 blkdev_dequeue_request(req
);
1804 dasd_end_request(req
, 0);
1806 spin_unlock_irq(&device
->request_queue_lock
);
1810 dasd_open(struct inode
*inp
, struct file
*filp
)
1812 struct gendisk
*disk
= inp
->i_bdev
->bd_disk
;
1813 struct dasd_device
*device
= disk
->private_data
;
1816 atomic_inc(&device
->open_count
);
1817 if (test_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
1822 if (!try_module_get(device
->discipline
->owner
)) {
1827 if (dasd_probeonly
) {
1828 DEV_MESSAGE(KERN_INFO
, device
, "%s",
1829 "No access to device due to probeonly mode");
1834 if (device
->state
<= DASD_STATE_BASIC
) {
1835 DBF_DEV_EVENT(DBF_ERR
, device
, " %s",
1836 " Cannot open unrecognized device");
1844 module_put(device
->discipline
->owner
);
1846 atomic_dec(&device
->open_count
);
1851 dasd_release(struct inode
*inp
, struct file
*filp
)
1853 struct gendisk
*disk
= inp
->i_bdev
->bd_disk
;
1854 struct dasd_device
*device
= disk
->private_data
;
1856 atomic_dec(&device
->open_count
);
1857 module_put(device
->discipline
->owner
);
1862 * Return disk geometry.
1865 dasd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
1867 struct dasd_device
*device
;
1869 device
= bdev
->bd_disk
->private_data
;
1873 if (!device
->discipline
||
1874 !device
->discipline
->fill_geometry
)
1877 device
->discipline
->fill_geometry(device
, geo
);
1878 geo
->start
= get_start_sect(bdev
) >> device
->s2b_shift
;
1882 struct block_device_operations
1883 dasd_device_operations
= {
1884 .owner
= THIS_MODULE
,
1886 .release
= dasd_release
,
1887 .ioctl
= dasd_ioctl
,
1888 .compat_ioctl
= dasd_compat_ioctl
,
1889 .getgeo
= dasd_getgeo
,
1896 #ifdef CONFIG_PROC_FS
1900 if (dasd_page_cache
!= NULL
) {
1901 kmem_cache_destroy(dasd_page_cache
);
1902 dasd_page_cache
= NULL
;
1904 dasd_gendisk_exit();
1906 if (dasd_debug_area
!= NULL
) {
1907 debug_unregister(dasd_debug_area
);
1908 dasd_debug_area
= NULL
;
1913 * SECTION: common functions for ccw_driver use
1917 * Initial attempt at a probe function. this can be simplified once
1918 * the other detection code is gone.
1921 dasd_generic_probe (struct ccw_device
*cdev
,
1922 struct dasd_discipline
*discipline
)
1926 ret
= ccw_device_set_options(cdev
, CCWDEV_DO_PATHGROUP
);
1929 "dasd_generic_probe: could not set ccw-device options "
1930 "for %s\n", cdev
->dev
.bus_id
);
1933 ret
= dasd_add_sysfs_files(cdev
);
1936 "dasd_generic_probe: could not add sysfs entries "
1937 "for %s\n", cdev
->dev
.bus_id
);
1940 cdev
->handler
= &dasd_int_handler
;
1943 * Automatically online either all dasd devices (dasd_autodetect)
1944 * or all devices specified with dasd= parameters during
1947 if ((dasd_get_feature(cdev
, DASD_FEATURE_INITIAL_ONLINE
) > 0 ) ||
1948 (dasd_autodetect
&& dasd_busid_known(cdev
->dev
.bus_id
) != 0))
1949 ret
= ccw_device_set_online(cdev
);
1952 "dasd_generic_probe: could not initially online "
1953 "ccw-device %s\n", cdev
->dev
.bus_id
);
1958 * This will one day be called from a global not_oper handler.
1959 * It is also used by driver_unregister during module unload.
1962 dasd_generic_remove (struct ccw_device
*cdev
)
1964 struct dasd_device
*device
;
1966 cdev
->handler
= NULL
;
1968 dasd_remove_sysfs_files(cdev
);
1969 device
= dasd_device_from_cdev(cdev
);
1972 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
1973 /* Already doing offline processing */
1974 dasd_put_device(device
);
1978 * This device is removed unconditionally. Set offline
1979 * flag to prevent dasd_open from opening it while it is
1980 * no quite down yet.
1982 dasd_set_target_state(device
, DASD_STATE_NEW
);
1983 /* dasd_delete_device destroys the device reference. */
1984 dasd_delete_device(device
);
1988 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
1989 * the device is detected for the first time and is supposed to be used
1990 * or the user has started activation through sysfs.
1993 dasd_generic_set_online (struct ccw_device
*cdev
,
1994 struct dasd_discipline
*base_discipline
)
1997 struct dasd_discipline
*discipline
;
1998 struct dasd_device
*device
;
2001 /* first online clears initial online feature flag */
2002 dasd_set_feature(cdev
, DASD_FEATURE_INITIAL_ONLINE
, 0);
2003 device
= dasd_create_device(cdev
);
2005 return PTR_ERR(device
);
2007 discipline
= base_discipline
;
2008 if (device
->features
& DASD_FEATURE_USEDIAG
) {
2009 if (!dasd_diag_discipline_pointer
) {
2010 printk (KERN_WARNING
2011 "dasd_generic couldn't online device %s "
2012 "- discipline DIAG not available\n",
2014 dasd_delete_device(device
);
2017 discipline
= dasd_diag_discipline_pointer
;
2019 if (!try_module_get(base_discipline
->owner
)) {
2020 dasd_delete_device(device
);
2023 if (!try_module_get(discipline
->owner
)) {
2024 module_put(base_discipline
->owner
);
2025 dasd_delete_device(device
);
2028 device
->base_discipline
= base_discipline
;
2029 device
->discipline
= discipline
;
2031 rc
= discipline
->check_device(device
);
2033 printk (KERN_WARNING
2034 "dasd_generic couldn't online device %s "
2035 "with discipline %s rc=%i\n",
2036 cdev
->dev
.bus_id
, discipline
->name
, rc
);
2037 module_put(discipline
->owner
);
2038 module_put(base_discipline
->owner
);
2039 dasd_delete_device(device
);
2043 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
2044 if (device
->state
<= DASD_STATE_KNOWN
) {
2045 printk (KERN_WARNING
2046 "dasd_generic discipline not found for %s\n",
2049 dasd_set_target_state(device
, DASD_STATE_NEW
);
2050 dasd_delete_device(device
);
2052 pr_debug("dasd_generic device %s found\n",
2055 /* FIXME: we have to wait for the root device but we don't want
2056 * to wait for each single device but for all at once. */
2057 wait_event(dasd_init_waitq
, _wait_for_device(device
));
2059 dasd_put_device(device
);
2065 dasd_generic_set_offline (struct ccw_device
*cdev
)
2067 struct dasd_device
*device
;
2068 int max_count
, open_count
;
2070 device
= dasd_device_from_cdev(cdev
);
2072 return PTR_ERR(device
);
2073 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
2074 /* Already doing offline processing */
2075 dasd_put_device(device
);
2079 * We must make sure that this device is currently not in use.
2080 * The open_count is increased for every opener, that includes
2081 * the blkdev_get in dasd_scan_partitions. We are only interested
2082 * in the other openers.
2084 max_count
= device
->bdev
? 0 : -1;
2085 open_count
= (int) atomic_read(&device
->open_count
);
2086 if (open_count
> max_count
) {
2088 printk (KERN_WARNING
"Can't offline dasd device with "
2089 "open count = %i.\n",
2092 printk (KERN_WARNING
"%s",
2093 "Can't offline dasd device due to internal "
2095 clear_bit(DASD_FLAG_OFFLINE
, &device
->flags
);
2096 dasd_put_device(device
);
2099 dasd_set_target_state(device
, DASD_STATE_NEW
);
2100 /* dasd_delete_device destroys the device reference. */
2101 dasd_delete_device(device
);
2107 dasd_generic_notify(struct ccw_device
*cdev
, int event
)
2109 struct dasd_device
*device
;
2110 struct dasd_ccw_req
*cqr
;
2111 unsigned long flags
;
2114 device
= dasd_device_from_cdev(cdev
);
2117 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
2122 /* First of all call extended error reporting. */
2123 dasd_eer_write(device
, NULL
, DASD_EER_NOPATH
);
2125 if (device
->state
< DASD_STATE_BASIC
)
2127 /* Device is active. We want to keep it. */
2128 if (test_bit(DASD_FLAG_DSC_ERROR
, &device
->flags
)) {
2129 list_for_each_entry(cqr
, &device
->ccw_queue
, list
)
2130 if (cqr
->status
== DASD_CQR_IN_IO
)
2131 cqr
->status
= DASD_CQR_FAILED
;
2132 device
->stopped
|= DASD_STOPPED_DC_EIO
;
2134 list_for_each_entry(cqr
, &device
->ccw_queue
, list
)
2135 if (cqr
->status
== DASD_CQR_IN_IO
) {
2136 cqr
->status
= DASD_CQR_QUEUED
;
2139 device
->stopped
|= DASD_STOPPED_DC_WAIT
;
2140 dasd_set_timer(device
, 0);
2142 dasd_schedule_bh(device
);
2146 /* FIXME: add a sanity check. */
2147 device
->stopped
&= ~(DASD_STOPPED_DC_WAIT
|DASD_STOPPED_DC_EIO
);
2148 dasd_schedule_bh(device
);
2152 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
2153 dasd_put_device(device
);
2163 init_waitqueue_head(&dasd_init_waitq
);
2164 init_waitqueue_head(&dasd_flush_wq
);
2166 /* register 'common' DASD debug area, used for all DBF_XXX calls */
2167 dasd_debug_area
= debug_register("dasd", 1, 2, 8 * sizeof (long));
2168 if (dasd_debug_area
== NULL
) {
2172 debug_register_view(dasd_debug_area
, &debug_sprintf_view
);
2173 debug_set_level(dasd_debug_area
, DBF_WARNING
);
2175 DBF_EVENT(DBF_EMERG
, "%s", "debug area created");
2177 dasd_diag_discipline_pointer
= NULL
;
2179 rc
= dasd_devmap_init();
2182 rc
= dasd_gendisk_init();
2188 rc
= dasd_eer_init();
2191 #ifdef CONFIG_PROC_FS
2192 rc
= dasd_proc_init();
2199 MESSAGE(KERN_INFO
, "%s", "initialization not performed due to errors");
2204 module_init(dasd_init
);
2205 module_exit(dasd_exit
);
2207 EXPORT_SYMBOL(dasd_debug_area
);
2208 EXPORT_SYMBOL(dasd_diag_discipline_pointer
);
2210 EXPORT_SYMBOL(dasd_add_request_head
);
2211 EXPORT_SYMBOL(dasd_add_request_tail
);
2212 EXPORT_SYMBOL(dasd_cancel_req
);
2213 EXPORT_SYMBOL(dasd_clear_timer
);
2214 EXPORT_SYMBOL(dasd_enable_device
);
2215 EXPORT_SYMBOL(dasd_int_handler
);
2216 EXPORT_SYMBOL(dasd_kfree_request
);
2217 EXPORT_SYMBOL(dasd_kick_device
);
2218 EXPORT_SYMBOL(dasd_kmalloc_request
);
2219 EXPORT_SYMBOL(dasd_schedule_bh
);
2220 EXPORT_SYMBOL(dasd_set_target_state
);
2221 EXPORT_SYMBOL(dasd_set_timer
);
2222 EXPORT_SYMBOL(dasd_sfree_request
);
2223 EXPORT_SYMBOL(dasd_sleep_on
);
2224 EXPORT_SYMBOL(dasd_sleep_on_immediatly
);
2225 EXPORT_SYMBOL(dasd_sleep_on_interruptible
);
2226 EXPORT_SYMBOL(dasd_smalloc_request
);
2227 EXPORT_SYMBOL(dasd_start_IO
);
2228 EXPORT_SYMBOL(dasd_term_IO
);
2230 EXPORT_SYMBOL_GPL(dasd_generic_probe
);
2231 EXPORT_SYMBOL_GPL(dasd_generic_remove
);
2232 EXPORT_SYMBOL_GPL(dasd_generic_notify
);
2233 EXPORT_SYMBOL_GPL(dasd_generic_set_online
);
2234 EXPORT_SYMBOL_GPL(dasd_generic_set_offline
);