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/config.h>
13 #include <linux/kmod.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/ctype.h>
17 #include <linux/major.h>
18 #include <linux/slab.h>
19 #include <linux/buffer_head.h>
20 #include <linux/hdreg.h>
22 #include <asm/ccwdev.h>
23 #include <asm/ebcdic.h>
24 #include <asm/idals.h>
25 #include <asm/todclk.h>
28 #define PRINTK_HEADER "dasd:"
32 * SECTION: Constant definitions to be used within this file
34 #define DASD_CHANQ_MAX_SIZE 4
37 * SECTION: exported variables of dasd.c
39 debug_info_t
*dasd_debug_area
;
40 struct dasd_discipline
*dasd_diag_discipline_pointer
;
42 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
43 MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
44 " Copyright 2000 IBM Corporation");
45 MODULE_SUPPORTED_DEVICE("dasd");
46 MODULE_PARM(dasd
, "1-" __MODULE_STRING(256) "s");
47 MODULE_LICENSE("GPL");
50 * SECTION: prototypes for static functions of dasd.c
52 static int dasd_alloc_queue(struct dasd_device
* device
);
53 static void dasd_setup_queue(struct dasd_device
* device
);
54 static void dasd_free_queue(struct dasd_device
* device
);
55 static void dasd_flush_request_queue(struct dasd_device
*);
56 static void dasd_int_handler(struct ccw_device
*, unsigned long, struct irb
*);
57 static void dasd_flush_ccw_queue(struct dasd_device
*, int);
58 static void dasd_tasklet(struct dasd_device
*);
59 static void do_kick_device(void *data
);
62 * SECTION: Operations on the device structure.
64 static wait_queue_head_t dasd_init_waitq
;
67 * Allocate memory for a new device structure.
70 dasd_alloc_device(void)
72 struct dasd_device
*device
;
74 device
= kmalloc(sizeof (struct dasd_device
), GFP_ATOMIC
);
76 return ERR_PTR(-ENOMEM
);
77 memset(device
, 0, sizeof (struct dasd_device
));
78 /* open_count = 0 means device online but not in use */
79 atomic_set(&device
->open_count
, -1);
81 /* Get two pages for normal block device operations. */
82 device
->ccw_mem
= (void *) __get_free_pages(GFP_ATOMIC
| GFP_DMA
, 1);
83 if (device
->ccw_mem
== NULL
) {
85 return ERR_PTR(-ENOMEM
);
87 /* Get one page for error recovery. */
88 device
->erp_mem
= (void *) get_zeroed_page(GFP_ATOMIC
| GFP_DMA
);
89 if (device
->erp_mem
== NULL
) {
90 free_pages((unsigned long) device
->ccw_mem
, 1);
92 return ERR_PTR(-ENOMEM
);
95 dasd_init_chunklist(&device
->ccw_chunks
, device
->ccw_mem
, PAGE_SIZE
*2);
96 dasd_init_chunklist(&device
->erp_chunks
, device
->erp_mem
, PAGE_SIZE
);
97 spin_lock_init(&device
->mem_lock
);
98 spin_lock_init(&device
->request_queue_lock
);
99 atomic_set (&device
->tasklet_scheduled
, 0);
100 tasklet_init(&device
->tasklet
,
101 (void (*)(unsigned long)) dasd_tasklet
,
102 (unsigned long) device
);
103 INIT_LIST_HEAD(&device
->ccw_queue
);
104 init_timer(&device
->timer
);
105 INIT_WORK(&device
->kick_work
, do_kick_device
, device
);
106 device
->state
= DASD_STATE_NEW
;
107 device
->target
= DASD_STATE_NEW
;
113 * Free memory of a device structure.
116 dasd_free_device(struct dasd_device
*device
)
118 kfree(device
->private);
119 free_page((unsigned long) device
->erp_mem
);
120 free_pages((unsigned long) device
->ccw_mem
, 1);
125 * Make a new device known to the system.
128 dasd_state_new_to_known(struct dasd_device
*device
)
133 * As long as the device is not in state DASD_STATE_NEW we want to
134 * keep the reference count > 0.
136 dasd_get_device(device
);
138 rc
= dasd_alloc_queue(device
);
140 dasd_put_device(device
);
144 device
->state
= DASD_STATE_KNOWN
;
149 * Let the system forget about a device.
152 dasd_state_known_to_new(struct dasd_device
* device
)
154 /* Forget the discipline information. */
155 device
->discipline
= NULL
;
156 device
->state
= DASD_STATE_NEW
;
158 dasd_free_queue(device
);
160 /* Give up reference we took in dasd_state_new_to_known. */
161 dasd_put_device(device
);
165 * Request the irq line for the device.
168 dasd_state_known_to_basic(struct dasd_device
* device
)
172 /* Allocate and register gendisk structure. */
173 rc
= dasd_gendisk_alloc(device
);
177 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
178 device
->debug_area
= debug_register(device
->cdev
->dev
.bus_id
, 1, 2,
180 debug_register_view(device
->debug_area
, &debug_sprintf_view
);
181 debug_set_level(device
->debug_area
, DBF_EMERG
);
182 DBF_DEV_EVENT(DBF_EMERG
, device
, "%s", "debug area created");
184 device
->state
= DASD_STATE_BASIC
;
189 * Release the irq line for the device. Terminate any running i/o.
192 dasd_state_basic_to_known(struct dasd_device
* device
)
194 dasd_gendisk_free(device
);
195 dasd_flush_ccw_queue(device
, 1);
196 DBF_DEV_EVENT(DBF_EMERG
, device
, "%p debug area deleted", device
);
197 if (device
->debug_area
!= NULL
) {
198 debug_unregister(device
->debug_area
);
199 device
->debug_area
= NULL
;
201 device
->state
= DASD_STATE_KNOWN
;
205 * Do the initial analysis. The do_analysis function may return
206 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
207 * until the discipline decides to continue the startup sequence
208 * by calling the function dasd_change_state. The eckd disciplines
209 * uses this to start a ccw that detects the format. The completion
210 * interrupt for this detection ccw uses the kernel event daemon to
211 * trigger the call to dasd_change_state. All this is done in the
212 * discipline code, see dasd_eckd.c.
213 * After the analysis ccw is done (do_analysis returned 0 or error)
214 * the block device is setup. Either a fake disk is added to allow
215 * formatting or a proper device request queue is created.
218 dasd_state_basic_to_ready(struct dasd_device
* device
)
223 if (device
->discipline
->do_analysis
!= NULL
)
224 rc
= device
->discipline
->do_analysis(device
);
227 dasd_setup_queue(device
);
228 device
->state
= DASD_STATE_READY
;
229 if (dasd_scan_partitions(device
) != 0)
230 device
->state
= DASD_STATE_BASIC
;
235 * Remove device from block device layer. Destroy dirty buffers.
236 * Forget format information. Check if the target level is basic
237 * and if it is create fake disk for formatting.
240 dasd_state_ready_to_basic(struct dasd_device
* device
)
242 dasd_flush_ccw_queue(device
, 0);
243 dasd_destroy_partitions(device
);
244 dasd_flush_request_queue(device
);
246 device
->bp_block
= 0;
247 device
->s2b_shift
= 0;
248 device
->state
= DASD_STATE_BASIC
;
252 * Make the device online and schedule the bottom half to start
253 * the requeueing of requests from the linux request queue to the
257 dasd_state_ready_to_online(struct dasd_device
* device
)
259 device
->state
= DASD_STATE_ONLINE
;
260 dasd_schedule_bh(device
);
265 * Stop the requeueing of requests again.
268 dasd_state_online_to_ready(struct dasd_device
* device
)
270 device
->state
= DASD_STATE_READY
;
274 * Device startup state changes.
277 dasd_increase_state(struct dasd_device
*device
)
282 if (device
->state
== DASD_STATE_NEW
&&
283 device
->target
>= DASD_STATE_KNOWN
)
284 rc
= dasd_state_new_to_known(device
);
287 device
->state
== DASD_STATE_KNOWN
&&
288 device
->target
>= DASD_STATE_BASIC
)
289 rc
= dasd_state_known_to_basic(device
);
292 device
->state
== DASD_STATE_BASIC
&&
293 device
->target
>= DASD_STATE_READY
)
294 rc
= dasd_state_basic_to_ready(device
);
297 device
->state
== DASD_STATE_READY
&&
298 device
->target
>= DASD_STATE_ONLINE
)
299 rc
= dasd_state_ready_to_online(device
);
305 * Device shutdown state changes.
308 dasd_decrease_state(struct dasd_device
*device
)
310 if (device
->state
== DASD_STATE_ONLINE
&&
311 device
->target
<= DASD_STATE_READY
)
312 dasd_state_online_to_ready(device
);
314 if (device
->state
== DASD_STATE_READY
&&
315 device
->target
<= DASD_STATE_BASIC
)
316 dasd_state_ready_to_basic(device
);
318 if (device
->state
== DASD_STATE_BASIC
&&
319 device
->target
<= DASD_STATE_KNOWN
)
320 dasd_state_basic_to_known(device
);
322 if (device
->state
== DASD_STATE_KNOWN
&&
323 device
->target
<= DASD_STATE_NEW
)
324 dasd_state_known_to_new(device
);
330 * This is the main startup/shutdown routine.
333 dasd_change_state(struct dasd_device
*device
)
337 if (device
->state
== device
->target
)
338 /* Already where we want to go today... */
340 if (device
->state
< device
->target
)
341 rc
= dasd_increase_state(device
);
343 rc
= dasd_decrease_state(device
);
344 if (rc
&& rc
!= -EAGAIN
)
345 device
->target
= device
->state
;
347 if (device
->state
== device
->target
)
348 wake_up(&dasd_init_waitq
);
352 * Kick starter for devices that did not complete the startup/shutdown
353 * procedure or were sleeping because of a pending state.
354 * dasd_kick_device will schedule a call do do_kick_device to the kernel
358 do_kick_device(void *data
)
360 struct dasd_device
*device
;
362 device
= (struct dasd_device
*) data
;
363 dasd_change_state(device
);
364 dasd_schedule_bh(device
);
365 dasd_put_device(device
);
369 dasd_kick_device(struct dasd_device
*device
)
371 dasd_get_device(device
);
372 /* queue call to dasd_kick_device to the kernel event daemon. */
373 schedule_work(&device
->kick_work
);
377 * Set the target state for a device and starts the state change.
380 dasd_set_target_state(struct dasd_device
*device
, int target
)
382 /* If we are in probeonly mode stop at DASD_STATE_READY. */
383 if (dasd_probeonly
&& target
> DASD_STATE_READY
)
384 target
= DASD_STATE_READY
;
385 if (device
->target
!= target
) {
386 if (device
->state
== target
)
387 wake_up(&dasd_init_waitq
);
388 device
->target
= target
;
390 if (device
->state
!= device
->target
)
391 dasd_change_state(device
);
395 * Enable devices with device numbers in [from..to].
398 _wait_for_device(struct dasd_device
*device
)
400 return (device
->state
== device
->target
);
404 dasd_enable_device(struct dasd_device
*device
)
406 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
407 if (device
->state
<= DASD_STATE_KNOWN
)
408 /* No discipline for device found. */
409 dasd_set_target_state(device
, DASD_STATE_NEW
);
410 /* Now wait for the devices to come up. */
411 wait_event(dasd_init_waitq
, _wait_for_device(device
));
415 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
417 #ifdef CONFIG_DASD_PROFILE
419 struct dasd_profile_info_t dasd_global_profile
;
420 unsigned int dasd_profile_level
= DASD_PROFILE_OFF
;
423 * Increments counter in global and local profiling structures.
425 #define dasd_profile_counter(value, counter, device) \
428 for (index = 0; index < 31 && value >> (2+index); index++); \
429 dasd_global_profile.counter[index]++; \
430 device->profile.counter[index]++; \
434 * Add profiling information for cqr before execution.
437 dasd_profile_start(struct dasd_device
*device
, struct dasd_ccw_req
* cqr
,
441 unsigned int counter
;
443 if (dasd_profile_level
!= DASD_PROFILE_ON
)
446 /* count the length of the chanq for statistics */
448 list_for_each(l
, &device
->ccw_queue
)
451 dasd_global_profile
.dasd_io_nr_req
[counter
]++;
452 device
->profile
.dasd_io_nr_req
[counter
]++;
456 * Add profiling information for cqr after execution.
459 dasd_profile_end(struct dasd_device
*device
, struct dasd_ccw_req
* cqr
,
462 long strtime
, irqtime
, endtime
, tottime
; /* in microseconds */
463 long tottimeps
, sectors
;
465 if (dasd_profile_level
!= DASD_PROFILE_ON
)
468 sectors
= req
->nr_sectors
;
469 if (!cqr
->buildclk
|| !cqr
->startclk
||
470 !cqr
->stopclk
|| !cqr
->endclk
||
474 strtime
= ((cqr
->startclk
- cqr
->buildclk
) >> 12);
475 irqtime
= ((cqr
->stopclk
- cqr
->startclk
) >> 12);
476 endtime
= ((cqr
->endclk
- cqr
->stopclk
) >> 12);
477 tottime
= ((cqr
->endclk
- cqr
->buildclk
) >> 12);
478 tottimeps
= tottime
/ sectors
;
480 if (!dasd_global_profile
.dasd_io_reqs
)
481 memset(&dasd_global_profile
, 0,
482 sizeof (struct dasd_profile_info_t
));
483 dasd_global_profile
.dasd_io_reqs
++;
484 dasd_global_profile
.dasd_io_sects
+= sectors
;
486 if (!device
->profile
.dasd_io_reqs
)
487 memset(&device
->profile
, 0,
488 sizeof (struct dasd_profile_info_t
));
489 device
->profile
.dasd_io_reqs
++;
490 device
->profile
.dasd_io_sects
+= sectors
;
492 dasd_profile_counter(sectors
, dasd_io_secs
, device
);
493 dasd_profile_counter(tottime
, dasd_io_times
, device
);
494 dasd_profile_counter(tottimeps
, dasd_io_timps
, device
);
495 dasd_profile_counter(strtime
, dasd_io_time1
, device
);
496 dasd_profile_counter(irqtime
, dasd_io_time2
, device
);
497 dasd_profile_counter(irqtime
/ sectors
, dasd_io_time2ps
, device
);
498 dasd_profile_counter(endtime
, dasd_io_time3
, device
);
501 #define dasd_profile_start(device, cqr, req) do {} while (0)
502 #define dasd_profile_end(device, cqr, req) do {} while (0)
503 #endif /* CONFIG_DASD_PROFILE */
506 * Allocate memory for a channel program with 'cplength' channel
507 * command words and 'datasize' additional space. There are two
508 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
509 * memory and 2) dasd_smalloc_request uses the static ccw memory
510 * that gets allocated for each device.
512 struct dasd_ccw_req
*
513 dasd_kmalloc_request(char *magic
, int cplength
, int datasize
,
514 struct dasd_device
* device
)
516 struct dasd_ccw_req
*cqr
;
519 if ( magic
== NULL
|| datasize
> PAGE_SIZE
||
520 (cplength
*sizeof(struct ccw1
)) > PAGE_SIZE
)
523 cqr
= kmalloc(sizeof(struct dasd_ccw_req
), GFP_ATOMIC
);
525 return ERR_PTR(-ENOMEM
);
526 memset(cqr
, 0, sizeof(struct dasd_ccw_req
));
529 cqr
->cpaddr
= kmalloc(cplength
*sizeof(struct ccw1
),
530 GFP_ATOMIC
| GFP_DMA
);
531 if (cqr
->cpaddr
== NULL
) {
533 return ERR_PTR(-ENOMEM
);
535 memset(cqr
->cpaddr
, 0, cplength
*sizeof(struct ccw1
));
539 cqr
->data
= kmalloc(datasize
, GFP_ATOMIC
| GFP_DMA
);
540 if (cqr
->data
== NULL
) {
543 return ERR_PTR(-ENOMEM
);
545 memset(cqr
->data
, 0, datasize
);
547 strncpy((char *) &cqr
->magic
, magic
, 4);
548 ASCEBC((char *) &cqr
->magic
, 4);
549 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
550 dasd_get_device(device
);
554 struct dasd_ccw_req
*
555 dasd_smalloc_request(char *magic
, int cplength
, int datasize
,
556 struct dasd_device
* device
)
559 struct dasd_ccw_req
*cqr
;
564 if ( magic
== NULL
|| datasize
> PAGE_SIZE
||
565 (cplength
*sizeof(struct ccw1
)) > PAGE_SIZE
)
568 size
= (sizeof(struct dasd_ccw_req
) + 7L) & -8L;
570 size
+= cplength
* sizeof(struct ccw1
);
573 spin_lock_irqsave(&device
->mem_lock
, flags
);
574 cqr
= (struct dasd_ccw_req
*)
575 dasd_alloc_chunk(&device
->ccw_chunks
, size
);
576 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
578 return ERR_PTR(-ENOMEM
);
579 memset(cqr
, 0, sizeof(struct dasd_ccw_req
));
580 data
= (char *) cqr
+ ((sizeof(struct dasd_ccw_req
) + 7L) & -8L);
583 cqr
->cpaddr
= (struct ccw1
*) data
;
584 data
+= cplength
*sizeof(struct ccw1
);
585 memset(cqr
->cpaddr
, 0, cplength
*sizeof(struct ccw1
));
590 memset(cqr
->data
, 0, datasize
);
592 strncpy((char *) &cqr
->magic
, magic
, 4);
593 ASCEBC((char *) &cqr
->magic
, 4);
594 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
595 dasd_get_device(device
);
600 * Free memory of a channel program. This function needs to free all the
601 * idal lists that might have been created by dasd_set_cda and the
602 * struct dasd_ccw_req itself.
605 dasd_kfree_request(struct dasd_ccw_req
* cqr
, struct dasd_device
* device
)
610 /* Clear any idals used for the request. */
613 clear_normalized_cda(ccw
);
614 } while (ccw
++->flags
& (CCW_FLAG_CC
| CCW_FLAG_DC
));
619 dasd_put_device(device
);
623 dasd_sfree_request(struct dasd_ccw_req
* cqr
, struct dasd_device
* device
)
627 spin_lock_irqsave(&device
->mem_lock
, flags
);
628 dasd_free_chunk(&device
->ccw_chunks
, cqr
);
629 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
630 dasd_put_device(device
);
634 * Check discipline magic in cqr.
637 dasd_check_cqr(struct dasd_ccw_req
*cqr
)
639 struct dasd_device
*device
;
643 device
= cqr
->device
;
644 if (strncmp((char *) &cqr
->magic
, device
->discipline
->ebcname
, 4)) {
645 DEV_MESSAGE(KERN_WARNING
, device
,
646 " dasd_ccw_req 0x%08x magic doesn't match"
647 " discipline 0x%08x",
649 *(unsigned int *) device
->discipline
->name
);
656 * Terminate the current i/o and set the request to clear_pending.
657 * Timer keeps device runnig.
658 * ccw_device_clear can fail if the i/o subsystem
662 dasd_term_IO(struct dasd_ccw_req
* cqr
)
664 struct dasd_device
*device
;
668 rc
= dasd_check_cqr(cqr
);
672 device
= (struct dasd_device
*) cqr
->device
;
673 while ((retries
< 5) && (cqr
->status
== DASD_CQR_IN_IO
)) {
674 rc
= ccw_device_clear(device
->cdev
, (long) cqr
);
676 case 0: /* termination successful */
678 cqr
->status
= DASD_CQR_CLEAR
;
679 cqr
->stopclk
= get_clock();
680 DBF_DEV_EVENT(DBF_DEBUG
, device
,
681 "terminate cqr %p successful",
685 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
686 "device gone, retry");
689 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
694 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
695 "device busy, retry later");
698 DEV_MESSAGE(KERN_ERR
, device
,
699 "line %d unknown RC=%d, please "
700 "report to linux390@de.ibm.com",
707 dasd_schedule_bh(device
);
712 * Start the i/o. This start_IO can fail if the channel is really busy.
713 * In that case set up a timer to start the request later.
716 dasd_start_IO(struct dasd_ccw_req
* cqr
)
718 struct dasd_device
*device
;
722 rc
= dasd_check_cqr(cqr
);
725 device
= (struct dasd_device
*) cqr
->device
;
726 if (cqr
->retries
< 0) {
727 DEV_MESSAGE(KERN_DEBUG
, device
,
728 "start_IO: request %p (%02x/%i) - no retry left.",
729 cqr
, cqr
->status
, cqr
->retries
);
730 cqr
->status
= DASD_CQR_FAILED
;
733 cqr
->startclk
= get_clock();
734 cqr
->starttime
= jiffies
;
736 rc
= ccw_device_start(device
->cdev
, cqr
->cpaddr
, (long) cqr
,
740 cqr
->status
= DASD_CQR_IN_IO
;
741 DBF_DEV_EVENT(DBF_DEBUG
, device
,
742 "start_IO: request %p started successful",
746 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
747 "start_IO: device busy, retry later");
750 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
751 "start_IO: request timeout, retry later");
754 /* -EACCES indicates that the request used only a
755 * subset of the available pathes and all these
757 * Do a retry with all available pathes.
759 cqr
->lpm
= LPM_ANYPATH
;
760 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
761 "start_IO: selected pathes gone,"
762 " retry on all pathes");
766 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
767 "start_IO: device gone, retry");
770 DEV_MESSAGE(KERN_ERR
, device
,
771 "line %d unknown RC=%d, please report"
772 " to linux390@de.ibm.com", __LINE__
, rc
);
780 * Timeout function for dasd devices. This is used for different purposes
781 * 1) missing interrupt handler for normal operation
782 * 2) delayed start of request where start_IO failed with -EBUSY
783 * 3) timeout for missing state change interrupts
784 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
785 * DASD_CQR_QUEUED for 2) and 3).
788 dasd_timeout_device(unsigned long ptr
)
791 struct dasd_device
*device
;
793 device
= (struct dasd_device
*) ptr
;
794 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
795 /* re-activate request queue */
796 device
->stopped
&= ~DASD_STOPPED_PENDING
;
797 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
798 dasd_schedule_bh(device
);
802 * Setup timeout for a device in jiffies.
805 dasd_set_timer(struct dasd_device
*device
, int expires
)
808 if (timer_pending(&device
->timer
))
809 del_timer(&device
->timer
);
812 if (timer_pending(&device
->timer
)) {
813 if (mod_timer(&device
->timer
, jiffies
+ expires
))
816 device
->timer
.function
= dasd_timeout_device
;
817 device
->timer
.data
= (unsigned long) device
;
818 device
->timer
.expires
= jiffies
+ expires
;
819 add_timer(&device
->timer
);
823 * Clear timeout for a device.
826 dasd_clear_timer(struct dasd_device
*device
)
828 if (timer_pending(&device
->timer
))
829 del_timer(&device
->timer
);
833 dasd_handle_killed_request(struct ccw_device
*cdev
, unsigned long intparm
)
835 struct dasd_ccw_req
*cqr
;
836 struct dasd_device
*device
;
838 cqr
= (struct dasd_ccw_req
*) intparm
;
839 if (cqr
->status
!= DASD_CQR_IN_IO
) {
841 "invalid status in handle_killed_request: "
842 "bus_id %s, status %02x",
843 cdev
->dev
.bus_id
, cqr
->status
);
847 device
= (struct dasd_device
*) cqr
->device
;
848 if (device
== NULL
||
849 device
!= dasd_device_from_cdev(cdev
) ||
850 strncmp(device
->discipline
->ebcname
, (char *) &cqr
->magic
, 4)) {
851 MESSAGE(KERN_DEBUG
, "invalid device in request: bus_id %s",
856 /* Schedule request to be retried. */
857 cqr
->status
= DASD_CQR_QUEUED
;
859 dasd_clear_timer(device
);
860 dasd_schedule_bh(device
);
861 dasd_put_device(device
);
865 dasd_handle_state_change_pending(struct dasd_device
*device
)
867 struct dasd_ccw_req
*cqr
;
868 struct list_head
*l
, *n
;
870 device
->stopped
&= ~DASD_STOPPED_PENDING
;
872 /* restart all 'running' IO on queue */
873 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
874 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
875 if (cqr
->status
== DASD_CQR_IN_IO
) {
876 cqr
->status
= DASD_CQR_QUEUED
;
879 dasd_clear_timer(device
);
880 dasd_schedule_bh(device
);
884 * Interrupt handler for "normal" ssch-io based dasd devices.
887 dasd_int_handler(struct ccw_device
*cdev
, unsigned long intparm
,
890 struct dasd_ccw_req
*cqr
, *next
;
891 struct dasd_device
*device
;
892 unsigned long long now
;
898 switch (PTR_ERR(irb
)) {
900 dasd_handle_killed_request(cdev
, intparm
);
903 printk(KERN_WARNING
"%s(%s): request timed out\n",
904 __FUNCTION__
, cdev
->dev
.bus_id
);
905 //FIXME - dasd uses own timeout interface...
908 printk(KERN_WARNING
"%s(%s): unknown error %ld\n",
909 __FUNCTION__
, cdev
->dev
.bus_id
, PTR_ERR(irb
));
916 DBF_EVENT(DBF_ERR
, "Interrupt: bus_id %s CS/DS %04x ip %08x",
917 cdev
->dev
.bus_id
, ((irb
->scsw
.cstat
<<8)|irb
->scsw
.dstat
),
918 (unsigned int) intparm
);
920 /* first of all check for state change pending interrupt */
921 mask
= DEV_STAT_ATTENTION
| DEV_STAT_DEV_END
| DEV_STAT_UNIT_EXCEP
;
922 if ((irb
->scsw
.dstat
& mask
) == mask
) {
923 device
= dasd_device_from_cdev(cdev
);
924 if (!IS_ERR(device
)) {
925 dasd_handle_state_change_pending(device
);
926 dasd_put_device(device
);
931 cqr
= (struct dasd_ccw_req
*) intparm
;
933 /* check for unsolicited interrupts */
936 "unsolicited interrupt received: bus_id %s",
941 device
= (struct dasd_device
*) cqr
->device
;
942 if (device
== NULL
||
943 strncmp(device
->discipline
->ebcname
, (char *) &cqr
->magic
, 4)) {
944 MESSAGE(KERN_DEBUG
, "invalid device in request: bus_id %s",
949 /* Check for clear pending */
950 if (cqr
->status
== DASD_CQR_CLEAR
&&
951 irb
->scsw
.fctl
& SCSW_FCTL_CLEAR_FUNC
) {
952 cqr
->status
= DASD_CQR_QUEUED
;
953 dasd_clear_timer(device
);
954 dasd_schedule_bh(device
);
958 /* check status - the request might have been killed by dyn detach */
959 if (cqr
->status
!= DASD_CQR_IN_IO
) {
961 "invalid status: bus_id %s, status %02x",
962 cdev
->dev
.bus_id
, cqr
->status
);
965 DBF_DEV_EVENT(DBF_DEBUG
, device
, "Int: CS/DS 0x%04x for cqr %p",
966 ((irb
->scsw
.cstat
<< 8) | irb
->scsw
.dstat
), cqr
);
968 /* Find out the appropriate era_action. */
969 if (irb
->scsw
.fctl
& SCSW_FCTL_HALT_FUNC
)
970 era
= dasd_era_fatal
;
971 else if (irb
->scsw
.dstat
== (DEV_STAT_CHN_END
| DEV_STAT_DEV_END
) &&
972 irb
->scsw
.cstat
== 0 &&
973 !irb
->esw
.esw0
.erw
.cons
)
975 else if (!test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
))
976 era
= dasd_era_fatal
; /* don't recover this request */
977 else if (irb
->esw
.esw0
.erw
.cons
)
978 era
= device
->discipline
->examine_error(cqr
, irb
);
980 era
= dasd_era_recover
;
982 DBF_DEV_EVENT(DBF_DEBUG
, device
, "era_code %d", era
);
984 if (era
== dasd_era_none
) {
985 cqr
->status
= DASD_CQR_DONE
;
987 /* Start first request on queue if possible -> fast_io. */
988 if (cqr
->list
.next
!= &device
->ccw_queue
) {
989 next
= list_entry(cqr
->list
.next
,
990 struct dasd_ccw_req
, list
);
991 if ((next
->status
== DASD_CQR_QUEUED
) &&
992 (!device
->stopped
)) {
993 if (device
->discipline
->start_IO(next
) == 0)
994 expires
= next
->expires
;
996 DEV_MESSAGE(KERN_DEBUG
, device
, "%s",
997 "Interrupt fastpath "
1001 } else { /* error */
1002 memcpy(&cqr
->irb
, irb
, sizeof (struct irb
));
1004 /* dump sense data */
1005 dasd_log_sense(cqr
, irb
);
1008 case dasd_era_fatal
:
1009 cqr
->status
= DASD_CQR_FAILED
;
1012 case dasd_era_recover
:
1013 cqr
->status
= DASD_CQR_ERROR
;
1020 dasd_set_timer(device
, expires
);
1022 dasd_clear_timer(device
);
1023 dasd_schedule_bh(device
);
1027 * posts the buffer_cache about a finalized request
1030 dasd_end_request(struct request
*req
, int uptodate
)
1032 if (end_that_request_first(req
, uptodate
, req
->hard_nr_sectors
))
1034 add_disk_randomness(req
->rq_disk
);
1035 end_that_request_last(req
, uptodate
);
1039 * Process finished error recovery ccw.
1042 __dasd_process_erp(struct dasd_device
*device
, struct dasd_ccw_req
*cqr
)
1044 dasd_erp_fn_t erp_fn
;
1046 if (cqr
->status
== DASD_CQR_DONE
)
1047 DBF_DEV_EVENT(DBF_NOTICE
, device
, "%s", "ERP successful");
1049 DEV_MESSAGE(KERN_ERR
, device
, "%s", "ERP unsuccessful");
1050 erp_fn
= device
->discipline
->erp_postaction(cqr
);
1055 * Process ccw request queue.
1058 __dasd_process_ccw_queue(struct dasd_device
* device
,
1059 struct list_head
*final_queue
)
1061 struct list_head
*l
, *n
;
1062 struct dasd_ccw_req
*cqr
;
1063 dasd_erp_fn_t erp_fn
;
1066 /* Process request with final status. */
1067 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1068 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
1069 /* Stop list processing at the first non-final request. */
1070 if (cqr
->status
!= DASD_CQR_DONE
&&
1071 cqr
->status
!= DASD_CQR_FAILED
&&
1072 cqr
->status
!= DASD_CQR_ERROR
)
1074 /* Process requests with DASD_CQR_ERROR */
1075 if (cqr
->status
== DASD_CQR_ERROR
) {
1076 if (cqr
->irb
.scsw
.fctl
& SCSW_FCTL_HALT_FUNC
) {
1077 cqr
->status
= DASD_CQR_FAILED
;
1078 cqr
->stopclk
= get_clock();
1080 if (cqr
->irb
.esw
.esw0
.erw
.cons
) {
1081 erp_fn
= device
->discipline
->
1085 dasd_default_erp_action(cqr
);
1089 /* Process finished ERP request. */
1091 __dasd_process_erp(device
, cqr
);
1095 /* Rechain finished requests to final queue */
1096 cqr
->endclk
= get_clock();
1097 list_move_tail(&cqr
->list
, final_queue
);
1102 dasd_end_request_cb(struct dasd_ccw_req
* cqr
, void *data
)
1104 struct request
*req
;
1105 struct dasd_device
*device
;
1108 req
= (struct request
*) data
;
1109 device
= cqr
->device
;
1110 dasd_profile_end(device
, cqr
, req
);
1111 status
= cqr
->device
->discipline
->free_cp(cqr
,req
);
1112 spin_lock_irq(&device
->request_queue_lock
);
1113 dasd_end_request(req
, status
);
1114 spin_unlock_irq(&device
->request_queue_lock
);
1119 * Fetch requests from the block device queue.
1122 __dasd_process_blk_queue(struct dasd_device
* device
)
1124 request_queue_t
*queue
;
1125 struct request
*req
;
1126 struct dasd_ccw_req
*cqr
;
1129 queue
= device
->request_queue
;
1130 /* No queue ? Then there is nothing to do. */
1135 * We requeue request from the block device queue to the ccw
1136 * queue only in two states. In state DASD_STATE_READY the
1137 * partition detection is done and we need to requeue requests
1138 * for that. State DASD_STATE_ONLINE is normal block device
1141 if (device
->state
!= DASD_STATE_READY
&&
1142 device
->state
!= DASD_STATE_ONLINE
)
1145 /* Now we try to fetch requests from the request queue */
1146 list_for_each_entry(cqr
, &device
->ccw_queue
, list
)
1147 if (cqr
->status
== DASD_CQR_QUEUED
)
1149 while (!blk_queue_plugged(queue
) &&
1150 elv_next_request(queue
) &&
1151 nr_queued
< DASD_CHANQ_MAX_SIZE
) {
1152 req
= elv_next_request(queue
);
1154 if (device
->features
& DASD_FEATURE_READONLY
&&
1155 rq_data_dir(req
) == WRITE
) {
1156 DBF_DEV_EVENT(DBF_ERR
, device
,
1157 "Rejecting write request %p",
1159 blkdev_dequeue_request(req
);
1160 dasd_end_request(req
, 0);
1163 if (device
->stopped
& DASD_STOPPED_DC_EIO
) {
1164 blkdev_dequeue_request(req
);
1165 dasd_end_request(req
, 0);
1168 cqr
= device
->discipline
->build_cp(device
, req
);
1170 if (PTR_ERR(cqr
) == -ENOMEM
)
1171 break; /* terminate request queue loop */
1172 DBF_DEV_EVENT(DBF_ERR
, device
,
1173 "CCW creation failed (rc=%ld) "
1176 blkdev_dequeue_request(req
);
1177 dasd_end_request(req
, 0);
1180 cqr
->callback
= dasd_end_request_cb
;
1181 cqr
->callback_data
= (void *) req
;
1182 cqr
->status
= DASD_CQR_QUEUED
;
1183 blkdev_dequeue_request(req
);
1184 list_add_tail(&cqr
->list
, &device
->ccw_queue
);
1185 dasd_profile_start(device
, cqr
, req
);
1191 * Take a look at the first request on the ccw queue and check
1192 * if it reached its expire time. If so, terminate the IO.
1195 __dasd_check_expire(struct dasd_device
* device
)
1197 struct dasd_ccw_req
*cqr
;
1199 if (list_empty(&device
->ccw_queue
))
1201 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, list
);
1202 if (cqr
->status
== DASD_CQR_IN_IO
&& cqr
->expires
!= 0) {
1203 if (time_after_eq(jiffies
, cqr
->expires
+ cqr
->starttime
)) {
1204 if (device
->discipline
->term_IO(cqr
) != 0)
1205 /* Hmpf, try again in 1/10 sec */
1206 dasd_set_timer(device
, 10);
1212 * Take a look at the first request on the ccw queue and check
1213 * if it needs to be started.
1216 __dasd_start_head(struct dasd_device
* device
)
1218 struct dasd_ccw_req
*cqr
;
1221 if (list_empty(&device
->ccw_queue
))
1223 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, list
);
1224 /* check FAILFAST */
1225 if (device
->stopped
& ~DASD_STOPPED_PENDING
&&
1226 test_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
)) {
1227 cqr
->status
= DASD_CQR_FAILED
;
1228 dasd_schedule_bh(device
);
1230 if ((cqr
->status
== DASD_CQR_QUEUED
) &&
1231 (!device
->stopped
)) {
1232 /* try to start the first I/O that can be started */
1233 rc
= device
->discipline
->start_IO(cqr
);
1235 dasd_set_timer(device
, cqr
->expires
);
1236 else if (rc
== -EACCES
) {
1237 dasd_schedule_bh(device
);
1239 /* Hmpf, try again in 1/2 sec */
1240 dasd_set_timer(device
, 50);
1245 * Remove requests from the ccw queue.
1248 dasd_flush_ccw_queue(struct dasd_device
* device
, int all
)
1250 struct list_head flush_queue
;
1251 struct list_head
*l
, *n
;
1252 struct dasd_ccw_req
*cqr
;
1254 INIT_LIST_HEAD(&flush_queue
);
1255 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1256 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1257 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
1258 /* Flush all request or only block device requests? */
1259 if (all
== 0 && cqr
->callback
== dasd_end_request_cb
)
1261 if (cqr
->status
== DASD_CQR_IN_IO
)
1262 device
->discipline
->term_IO(cqr
);
1263 if (cqr
->status
!= DASD_CQR_DONE
||
1264 cqr
->status
!= DASD_CQR_FAILED
) {
1265 cqr
->status
= DASD_CQR_FAILED
;
1266 cqr
->stopclk
= get_clock();
1268 /* Process finished ERP request. */
1270 __dasd_process_erp(device
, cqr
);
1273 /* Rechain request on device request queue */
1274 cqr
->endclk
= get_clock();
1275 list_move_tail(&cqr
->list
, &flush_queue
);
1277 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1278 /* Now call the callback function of flushed requests */
1279 list_for_each_safe(l
, n
, &flush_queue
) {
1280 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
1281 if (cqr
->callback
!= NULL
)
1282 (cqr
->callback
)(cqr
, cqr
->callback_data
);
1287 * Acquire the device lock and process queues for the device.
1290 dasd_tasklet(struct dasd_device
* device
)
1292 struct list_head final_queue
;
1293 struct list_head
*l
, *n
;
1294 struct dasd_ccw_req
*cqr
;
1296 atomic_set (&device
->tasklet_scheduled
, 0);
1297 INIT_LIST_HEAD(&final_queue
);
1298 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1299 /* Check expire time of first request on the ccw queue. */
1300 __dasd_check_expire(device
);
1301 /* Finish off requests on ccw queue */
1302 __dasd_process_ccw_queue(device
, &final_queue
);
1303 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1304 /* Now call the callback function of requests with final status */
1305 list_for_each_safe(l
, n
, &final_queue
) {
1306 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
1307 list_del_init(&cqr
->list
);
1308 if (cqr
->callback
!= NULL
)
1309 (cqr
->callback
)(cqr
, cqr
->callback_data
);
1311 spin_lock_irq(&device
->request_queue_lock
);
1312 spin_lock(get_ccwdev_lock(device
->cdev
));
1313 /* Get new request from the block device request queue */
1314 __dasd_process_blk_queue(device
);
1315 /* Now check if the head of the ccw queue needs to be started. */
1316 __dasd_start_head(device
);
1317 spin_unlock(get_ccwdev_lock(device
->cdev
));
1318 spin_unlock_irq(&device
->request_queue_lock
);
1319 dasd_put_device(device
);
1323 * Schedules a call to dasd_tasklet over the device tasklet.
1326 dasd_schedule_bh(struct dasd_device
* device
)
1328 /* Protect against rescheduling. */
1329 if (atomic_cmpxchg (&device
->tasklet_scheduled
, 0, 1) != 0)
1331 dasd_get_device(device
);
1332 tasklet_hi_schedule(&device
->tasklet
);
1336 * Queue a request to the head of the ccw_queue. Start the I/O if
1340 dasd_add_request_head(struct dasd_ccw_req
*req
)
1342 struct dasd_device
*device
;
1343 unsigned long flags
;
1345 device
= req
->device
;
1346 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1347 req
->status
= DASD_CQR_QUEUED
;
1348 req
->device
= device
;
1349 list_add(&req
->list
, &device
->ccw_queue
);
1350 /* let the bh start the request to keep them in order */
1351 dasd_schedule_bh(device
);
1352 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1356 * Queue a request to the tail of the ccw_queue. Start the I/O if
1360 dasd_add_request_tail(struct dasd_ccw_req
*req
)
1362 struct dasd_device
*device
;
1363 unsigned long flags
;
1365 device
= req
->device
;
1366 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1367 req
->status
= DASD_CQR_QUEUED
;
1368 req
->device
= device
;
1369 list_add_tail(&req
->list
, &device
->ccw_queue
);
1370 /* let the bh start the request to keep them in order */
1371 dasd_schedule_bh(device
);
1372 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1379 dasd_wakeup_cb(struct dasd_ccw_req
*cqr
, void *data
)
1381 wake_up((wait_queue_head_t
*) data
);
1385 _wait_for_wakeup(struct dasd_ccw_req
*cqr
)
1387 struct dasd_device
*device
;
1390 device
= cqr
->device
;
1391 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1392 rc
= ((cqr
->status
== DASD_CQR_DONE
||
1393 cqr
->status
== DASD_CQR_FAILED
) &&
1394 list_empty(&cqr
->list
));
1395 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1400 * Attempts to start a special ccw queue and waits for its completion.
1403 dasd_sleep_on(struct dasd_ccw_req
* cqr
)
1405 wait_queue_head_t wait_q
;
1406 struct dasd_device
*device
;
1409 device
= cqr
->device
;
1410 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1412 init_waitqueue_head (&wait_q
);
1413 cqr
->callback
= dasd_wakeup_cb
;
1414 cqr
->callback_data
= (void *) &wait_q
;
1415 cqr
->status
= DASD_CQR_QUEUED
;
1416 list_add_tail(&cqr
->list
, &device
->ccw_queue
);
1418 /* let the bh start the request to keep them in order */
1419 dasd_schedule_bh(device
);
1421 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1423 wait_event(wait_q
, _wait_for_wakeup(cqr
));
1425 /* Request status is either done or failed. */
1426 rc
= (cqr
->status
== DASD_CQR_FAILED
) ? -EIO
: 0;
1431 * Attempts to start a special ccw queue and wait interruptible
1432 * for its completion.
1435 dasd_sleep_on_interruptible(struct dasd_ccw_req
* cqr
)
1437 wait_queue_head_t wait_q
;
1438 struct dasd_device
*device
;
1441 device
= cqr
->device
;
1442 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1444 init_waitqueue_head (&wait_q
);
1445 cqr
->callback
= dasd_wakeup_cb
;
1446 cqr
->callback_data
= (void *) &wait_q
;
1447 cqr
->status
= DASD_CQR_QUEUED
;
1448 list_add_tail(&cqr
->list
, &device
->ccw_queue
);
1450 /* let the bh start the request to keep them in order */
1451 dasd_schedule_bh(device
);
1452 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1456 rc
= wait_event_interruptible(wait_q
, _wait_for_wakeup(cqr
));
1457 if (rc
!= -ERESTARTSYS
) {
1458 /* Request is final (done or failed) */
1459 rc
= (cqr
->status
== DASD_CQR_DONE
) ? 0 : -EIO
;
1462 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1463 switch (cqr
->status
) {
1464 case DASD_CQR_IN_IO
:
1465 /* terminate runnig cqr */
1466 if (device
->discipline
->term_IO
) {
1468 device
->discipline
->term_IO(cqr
);
1470 * wait (non-interruptible) for final status
1471 * because signal ist still pending
1473 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1474 wait_event(wait_q
, _wait_for_wakeup(cqr
));
1475 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1476 rc
= (cqr
->status
== DASD_CQR_DONE
) ? 0 : -EIO
;
1480 case DASD_CQR_QUEUED
:
1482 list_del_init(&cqr
->list
);
1487 /* cqr with 'non-interruptable' status - just wait */
1490 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1496 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
1497 * for eckd devices) the currently running request has to be terminated
1498 * and be put back to status queued, before the special request is added
1499 * to the head of the queue. Then the special request is waited on normally.
1502 _dasd_term_running_cqr(struct dasd_device
*device
)
1504 struct dasd_ccw_req
*cqr
;
1507 if (list_empty(&device
->ccw_queue
))
1509 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, list
);
1510 rc
= device
->discipline
->term_IO(cqr
);
1512 /* termination successful */
1513 cqr
->status
= DASD_CQR_QUEUED
;
1514 cqr
->startclk
= cqr
->stopclk
= 0;
1521 dasd_sleep_on_immediatly(struct dasd_ccw_req
* cqr
)
1523 wait_queue_head_t wait_q
;
1524 struct dasd_device
*device
;
1527 device
= cqr
->device
;
1528 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1529 rc
= _dasd_term_running_cqr(device
);
1531 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1535 init_waitqueue_head (&wait_q
);
1536 cqr
->callback
= dasd_wakeup_cb
;
1537 cqr
->callback_data
= (void *) &wait_q
;
1538 cqr
->status
= DASD_CQR_QUEUED
;
1539 list_add(&cqr
->list
, &device
->ccw_queue
);
1541 /* let the bh start the request to keep them in order */
1542 dasd_schedule_bh(device
);
1544 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1546 wait_event(wait_q
, _wait_for_wakeup(cqr
));
1548 /* Request status is either done or failed. */
1549 rc
= (cqr
->status
== DASD_CQR_FAILED
) ? -EIO
: 0;
1554 * Cancels a request that was started with dasd_sleep_on_req.
1555 * This is useful to timeout requests. The request will be
1556 * terminated if it is currently in i/o.
1557 * Returns 1 if the request has been terminated.
1560 dasd_cancel_req(struct dasd_ccw_req
*cqr
)
1562 struct dasd_device
*device
= cqr
->device
;
1563 unsigned long flags
;
1567 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1568 switch (cqr
->status
) {
1569 case DASD_CQR_QUEUED
:
1570 /* request was not started - just set to failed */
1571 cqr
->status
= DASD_CQR_FAILED
;
1573 case DASD_CQR_IN_IO
:
1574 /* request in IO - terminate IO and release again */
1575 if (device
->discipline
->term_IO(cqr
) != 0)
1576 /* what to do if unable to terminate ??????
1578 cqr
->status
= DASD_CQR_FAILED
;
1579 cqr
->stopclk
= get_clock();
1583 case DASD_CQR_FAILED
:
1584 /* already finished - do nothing */
1587 DEV_MESSAGE(KERN_ALERT
, device
,
1588 "invalid status %02x in request",
1593 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1594 dasd_schedule_bh(device
);
1599 * SECTION: Block device operations (request queue, partitions, open, release).
1603 * Dasd request queue function. Called from ll_rw_blk.c
1606 do_dasd_request(request_queue_t
* queue
)
1608 struct dasd_device
*device
;
1610 device
= (struct dasd_device
*) queue
->queuedata
;
1611 spin_lock(get_ccwdev_lock(device
->cdev
));
1612 /* Get new request from the block device request queue */
1613 __dasd_process_blk_queue(device
);
1614 /* Now check if the head of the ccw queue needs to be started. */
1615 __dasd_start_head(device
);
1616 spin_unlock(get_ccwdev_lock(device
->cdev
));
1620 * Allocate and initialize request queue and default I/O scheduler.
1623 dasd_alloc_queue(struct dasd_device
* device
)
1627 device
->request_queue
= blk_init_queue(do_dasd_request
,
1628 &device
->request_queue_lock
);
1629 if (device
->request_queue
== NULL
)
1632 device
->request_queue
->queuedata
= device
;
1634 elevator_exit(device
->request_queue
->elevator
);
1635 rc
= elevator_init(device
->request_queue
, "deadline");
1637 blk_cleanup_queue(device
->request_queue
);
1644 * Allocate and initialize request queue.
1647 dasd_setup_queue(struct dasd_device
* device
)
1651 blk_queue_hardsect_size(device
->request_queue
, device
->bp_block
);
1652 max
= device
->discipline
->max_blocks
<< device
->s2b_shift
;
1653 blk_queue_max_sectors(device
->request_queue
, max
);
1654 blk_queue_max_phys_segments(device
->request_queue
, -1L);
1655 blk_queue_max_hw_segments(device
->request_queue
, -1L);
1656 blk_queue_max_segment_size(device
->request_queue
, -1L);
1657 blk_queue_segment_boundary(device
->request_queue
, -1L);
1658 blk_queue_ordered(device
->request_queue
, QUEUE_ORDERED_TAG
, NULL
);
1662 * Deactivate and free request queue.
1665 dasd_free_queue(struct dasd_device
* device
)
1667 if (device
->request_queue
) {
1668 blk_cleanup_queue(device
->request_queue
);
1669 device
->request_queue
= NULL
;
1674 * Flush request on the request queue.
1677 dasd_flush_request_queue(struct dasd_device
* device
)
1679 struct request
*req
;
1681 if (!device
->request_queue
)
1684 spin_lock_irq(&device
->request_queue_lock
);
1685 while (!list_empty(&device
->request_queue
->queue_head
)) {
1686 req
= elv_next_request(device
->request_queue
);
1689 dasd_end_request(req
, 0);
1690 blkdev_dequeue_request(req
);
1692 spin_unlock_irq(&device
->request_queue_lock
);
1696 dasd_open(struct inode
*inp
, struct file
*filp
)
1698 struct gendisk
*disk
= inp
->i_bdev
->bd_disk
;
1699 struct dasd_device
*device
= disk
->private_data
;
1702 atomic_inc(&device
->open_count
);
1703 if (test_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
1708 if (!try_module_get(device
->discipline
->owner
)) {
1713 if (dasd_probeonly
) {
1714 DEV_MESSAGE(KERN_INFO
, device
, "%s",
1715 "No access to device due to probeonly mode");
1720 if (device
->state
< DASD_STATE_BASIC
) {
1721 DBF_DEV_EVENT(DBF_ERR
, device
, " %s",
1722 " Cannot open unrecognized device");
1730 module_put(device
->discipline
->owner
);
1732 atomic_dec(&device
->open_count
);
1737 dasd_release(struct inode
*inp
, struct file
*filp
)
1739 struct gendisk
*disk
= inp
->i_bdev
->bd_disk
;
1740 struct dasd_device
*device
= disk
->private_data
;
1742 atomic_dec(&device
->open_count
);
1743 module_put(device
->discipline
->owner
);
1748 * Return disk geometry.
1751 dasd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
1753 struct dasd_device
*device
;
1755 device
= bdev
->bd_disk
->private_data
;
1759 if (!device
->discipline
||
1760 !device
->discipline
->fill_geometry
)
1763 device
->discipline
->fill_geometry(device
, geo
);
1764 geo
->start
= get_start_sect(bdev
) >> device
->s2b_shift
;
1768 struct block_device_operations
1769 dasd_device_operations
= {
1770 .owner
= THIS_MODULE
,
1772 .release
= dasd_release
,
1773 .ioctl
= dasd_ioctl
,
1774 .compat_ioctl
= dasd_compat_ioctl
,
1775 .getgeo
= dasd_getgeo
,
1782 #ifdef CONFIG_PROC_FS
1786 if (dasd_page_cache
!= NULL
) {
1787 kmem_cache_destroy(dasd_page_cache
);
1788 dasd_page_cache
= NULL
;
1790 dasd_gendisk_exit();
1792 devfs_remove("dasd");
1793 if (dasd_debug_area
!= NULL
) {
1794 debug_unregister(dasd_debug_area
);
1795 dasd_debug_area
= NULL
;
1800 * SECTION: common functions for ccw_driver use
1804 * Initial attempt at a probe function. this can be simplified once
1805 * the other detection code is gone.
1808 dasd_generic_probe (struct ccw_device
*cdev
,
1809 struct dasd_discipline
*discipline
)
1813 ret
= dasd_add_sysfs_files(cdev
);
1816 "dasd_generic_probe: could not add sysfs entries "
1817 "for %s\n", cdev
->dev
.bus_id
);
1819 cdev
->handler
= &dasd_int_handler
;
1826 * This will one day be called from a global not_oper handler.
1827 * It is also used by driver_unregister during module unload.
1830 dasd_generic_remove (struct ccw_device
*cdev
)
1832 struct dasd_device
*device
;
1834 cdev
->handler
= NULL
;
1836 dasd_remove_sysfs_files(cdev
);
1837 device
= dasd_device_from_cdev(cdev
);
1840 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
1841 /* Already doing offline processing */
1842 dasd_put_device(device
);
1846 * This device is removed unconditionally. Set offline
1847 * flag to prevent dasd_open from opening it while it is
1848 * no quite down yet.
1850 dasd_set_target_state(device
, DASD_STATE_NEW
);
1851 /* dasd_delete_device destroys the device reference. */
1852 dasd_delete_device(device
);
1856 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
1857 * the device is detected for the first time and is supposed to be used
1858 * or the user has started activation through sysfs.
1861 dasd_generic_set_online (struct ccw_device
*cdev
,
1862 struct dasd_discipline
*discipline
)
1865 struct dasd_device
*device
;
1868 device
= dasd_create_device(cdev
);
1870 return PTR_ERR(device
);
1872 if (device
->features
& DASD_FEATURE_USEDIAG
) {
1873 if (!dasd_diag_discipline_pointer
) {
1874 printk (KERN_WARNING
1875 "dasd_generic couldn't online device %s "
1876 "- discipline DIAG not available\n",
1878 dasd_delete_device(device
);
1881 discipline
= dasd_diag_discipline_pointer
;
1883 device
->discipline
= discipline
;
1885 rc
= discipline
->check_device(device
);
1887 printk (KERN_WARNING
1888 "dasd_generic couldn't online device %s "
1889 "with discipline %s rc=%i\n",
1890 cdev
->dev
.bus_id
, discipline
->name
, rc
);
1891 dasd_delete_device(device
);
1895 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
1896 if (device
->state
<= DASD_STATE_KNOWN
) {
1897 printk (KERN_WARNING
1898 "dasd_generic discipline not found for %s\n",
1901 dasd_set_target_state(device
, DASD_STATE_NEW
);
1902 dasd_delete_device(device
);
1904 pr_debug("dasd_generic device %s found\n",
1907 /* FIXME: we have to wait for the root device but we don't want
1908 * to wait for each single device but for all at once. */
1909 wait_event(dasd_init_waitq
, _wait_for_device(device
));
1911 dasd_put_device(device
);
1917 dasd_generic_set_offline (struct ccw_device
*cdev
)
1919 struct dasd_device
*device
;
1922 device
= dasd_device_from_cdev(cdev
);
1924 return PTR_ERR(device
);
1925 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
1926 /* Already doing offline processing */
1927 dasd_put_device(device
);
1931 * We must make sure that this device is currently not in use.
1932 * The open_count is increased for every opener, that includes
1933 * the blkdev_get in dasd_scan_partitions. We are only interested
1934 * in the other openers.
1936 max_count
= device
->bdev
? 0 : -1;
1937 if (atomic_read(&device
->open_count
) > max_count
) {
1938 printk (KERN_WARNING
"Can't offline dasd device with open"
1940 atomic_read(&device
->open_count
));
1941 clear_bit(DASD_FLAG_OFFLINE
, &device
->flags
);
1942 dasd_put_device(device
);
1945 dasd_set_target_state(device
, DASD_STATE_NEW
);
1946 /* dasd_delete_device destroys the device reference. */
1947 dasd_delete_device(device
);
1953 dasd_generic_notify(struct ccw_device
*cdev
, int event
)
1955 struct dasd_device
*device
;
1956 struct dasd_ccw_req
*cqr
;
1957 unsigned long flags
;
1960 device
= dasd_device_from_cdev(cdev
);
1963 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
1968 if (device
->state
< DASD_STATE_BASIC
)
1970 /* Device is active. We want to keep it. */
1971 if (test_bit(DASD_FLAG_DSC_ERROR
, &device
->flags
)) {
1972 list_for_each_entry(cqr
, &device
->ccw_queue
, list
)
1973 if (cqr
->status
== DASD_CQR_IN_IO
)
1974 cqr
->status
= DASD_CQR_FAILED
;
1975 device
->stopped
|= DASD_STOPPED_DC_EIO
;
1977 list_for_each_entry(cqr
, &device
->ccw_queue
, list
)
1978 if (cqr
->status
== DASD_CQR_IN_IO
) {
1979 cqr
->status
= DASD_CQR_QUEUED
;
1982 device
->stopped
|= DASD_STOPPED_DC_WAIT
;
1983 dasd_set_timer(device
, 0);
1985 dasd_schedule_bh(device
);
1989 /* FIXME: add a sanity check. */
1990 device
->stopped
&= ~(DASD_STOPPED_DC_WAIT
|DASD_STOPPED_DC_EIO
);
1991 dasd_schedule_bh(device
);
1995 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
1996 dasd_put_device(device
);
2001 * Automatically online either all dasd devices (dasd_autodetect) or
2002 * all devices specified with dasd= parameters.
2005 __dasd_auto_online(struct device
*dev
, void *data
)
2007 struct ccw_device
*cdev
;
2009 cdev
= to_ccwdev(dev
);
2010 if (dasd_autodetect
|| dasd_busid_known(cdev
->dev
.bus_id
) == 0)
2011 ccw_device_set_online(cdev
);
2016 dasd_generic_auto_online (struct ccw_driver
*dasd_discipline_driver
)
2018 struct device_driver
*drv
;
2020 drv
= get_driver(&dasd_discipline_driver
->driver
);
2021 driver_for_each_device(drv
, NULL
, NULL
, __dasd_auto_online
);
2030 init_waitqueue_head(&dasd_init_waitq
);
2032 /* register 'common' DASD debug area, used for all DBF_XXX calls */
2033 dasd_debug_area
= debug_register("dasd", 1, 2, 8 * sizeof (long));
2034 if (dasd_debug_area
== NULL
) {
2038 debug_register_view(dasd_debug_area
, &debug_sprintf_view
);
2039 debug_set_level(dasd_debug_area
, DBF_EMERG
);
2041 DBF_EVENT(DBF_EMERG
, "%s", "debug area created");
2043 dasd_diag_discipline_pointer
= NULL
;
2045 rc
= devfs_mk_dir("dasd");
2048 rc
= dasd_devmap_init();
2051 rc
= dasd_gendisk_init();
2057 rc
= dasd_ioctl_init();
2060 #ifdef CONFIG_PROC_FS
2061 rc
= dasd_proc_init();
2068 MESSAGE(KERN_INFO
, "%s", "initialization not performed due to errors");
2073 module_init(dasd_init
);
2074 module_exit(dasd_exit
);
2076 EXPORT_SYMBOL(dasd_debug_area
);
2077 EXPORT_SYMBOL(dasd_diag_discipline_pointer
);
2079 EXPORT_SYMBOL(dasd_add_request_head
);
2080 EXPORT_SYMBOL(dasd_add_request_tail
);
2081 EXPORT_SYMBOL(dasd_cancel_req
);
2082 EXPORT_SYMBOL(dasd_clear_timer
);
2083 EXPORT_SYMBOL(dasd_enable_device
);
2084 EXPORT_SYMBOL(dasd_int_handler
);
2085 EXPORT_SYMBOL(dasd_kfree_request
);
2086 EXPORT_SYMBOL(dasd_kick_device
);
2087 EXPORT_SYMBOL(dasd_kmalloc_request
);
2088 EXPORT_SYMBOL(dasd_schedule_bh
);
2089 EXPORT_SYMBOL(dasd_set_target_state
);
2090 EXPORT_SYMBOL(dasd_set_timer
);
2091 EXPORT_SYMBOL(dasd_sfree_request
);
2092 EXPORT_SYMBOL(dasd_sleep_on
);
2093 EXPORT_SYMBOL(dasd_sleep_on_immediatly
);
2094 EXPORT_SYMBOL(dasd_sleep_on_interruptible
);
2095 EXPORT_SYMBOL(dasd_smalloc_request
);
2096 EXPORT_SYMBOL(dasd_start_IO
);
2097 EXPORT_SYMBOL(dasd_term_IO
);
2099 EXPORT_SYMBOL_GPL(dasd_generic_probe
);
2100 EXPORT_SYMBOL_GPL(dasd_generic_remove
);
2101 EXPORT_SYMBOL_GPL(dasd_generic_notify
);
2102 EXPORT_SYMBOL_GPL(dasd_generic_set_online
);
2103 EXPORT_SYMBOL_GPL(dasd_generic_set_offline
);
2104 EXPORT_SYMBOL_GPL(dasd_generic_auto_online
);
2107 * Overrides for Emacs so that we follow Linus's tabbing style.
2108 * Emacs will notice this stuff at the end of the file and automatically
2109 * adjust the settings for this buffer only. This must remain at the end
2111 * ---------------------------------------------------------------------------
2114 * c-brace-imaginary-offset: 0
2115 * c-brace-offset: -4
2116 * c-argdecl-indent: 4
2117 * c-label-offset: -4
2118 * c-continued-statement-offset: 4
2119 * c-continued-brace-offset: 0
2120 * indent-tabs-mode: 1