2 * File...........: linux/drivers/s390/block/dasd.c
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
13 #include <linux/config.h>
14 #include <linux/kmod.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/ctype.h>
18 #include <linux/major.h>
19 #include <linux/slab.h>
20 #include <linux/buffer_head.h>
21 #include <linux/hdreg.h>
23 #include <asm/ccwdev.h>
24 #include <asm/ebcdic.h>
25 #include <asm/idals.h>
26 #include <asm/todclk.h>
29 #define PRINTK_HEADER "dasd:"
33 * SECTION: Constant definitions to be used within this file
35 #define DASD_CHANQ_MAX_SIZE 4
38 * SECTION: exported variables of dasd.c
40 debug_info_t
*dasd_debug_area
;
41 struct dasd_discipline
*dasd_diag_discipline_pointer
;
43 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
44 MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
45 " Copyright 2000 IBM Corporation");
46 MODULE_SUPPORTED_DEVICE("dasd");
47 MODULE_PARM(dasd
, "1-" __MODULE_STRING(256) "s");
48 MODULE_LICENSE("GPL");
51 * SECTION: prototypes for static functions of dasd.c
53 static int dasd_alloc_queue(struct dasd_device
* device
);
54 static void dasd_setup_queue(struct dasd_device
* device
);
55 static void dasd_free_queue(struct dasd_device
* device
);
56 static void dasd_flush_request_queue(struct dasd_device
*);
57 static void dasd_int_handler(struct ccw_device
*, unsigned long, struct irb
*);
58 static void dasd_flush_ccw_queue(struct dasd_device
*, int);
59 static void dasd_tasklet(struct dasd_device
*);
60 static void do_kick_device(void *data
);
63 * SECTION: Operations on the device structure.
65 static wait_queue_head_t dasd_init_waitq
;
68 * Allocate memory for a new device structure.
71 dasd_alloc_device(void)
73 struct dasd_device
*device
;
75 device
= kmalloc(sizeof (struct dasd_device
), GFP_ATOMIC
);
77 return ERR_PTR(-ENOMEM
);
78 memset(device
, 0, sizeof (struct dasd_device
));
79 /* open_count = 0 means device online but not in use */
80 atomic_set(&device
->open_count
, -1);
82 /* Get two pages for normal block device operations. */
83 device
->ccw_mem
= (void *) __get_free_pages(GFP_ATOMIC
| GFP_DMA
, 1);
84 if (device
->ccw_mem
== NULL
) {
86 return ERR_PTR(-ENOMEM
);
88 /* Get one page for error recovery. */
89 device
->erp_mem
= (void *) get_zeroed_page(GFP_ATOMIC
| GFP_DMA
);
90 if (device
->erp_mem
== NULL
) {
91 free_pages((unsigned long) device
->ccw_mem
, 1);
93 return ERR_PTR(-ENOMEM
);
96 dasd_init_chunklist(&device
->ccw_chunks
, device
->ccw_mem
, PAGE_SIZE
*2);
97 dasd_init_chunklist(&device
->erp_chunks
, device
->erp_mem
, PAGE_SIZE
);
98 spin_lock_init(&device
->mem_lock
);
99 spin_lock_init(&device
->request_queue_lock
);
100 atomic_set (&device
->tasklet_scheduled
, 0);
101 tasklet_init(&device
->tasklet
,
102 (void (*)(unsigned long)) dasd_tasklet
,
103 (unsigned long) device
);
104 INIT_LIST_HEAD(&device
->ccw_queue
);
105 init_timer(&device
->timer
);
106 INIT_WORK(&device
->kick_work
, do_kick_device
, device
);
107 device
->state
= DASD_STATE_NEW
;
108 device
->target
= DASD_STATE_NEW
;
114 * Free memory of a device structure.
117 dasd_free_device(struct dasd_device
*device
)
119 kfree(device
->private);
120 free_page((unsigned long) device
->erp_mem
);
121 free_pages((unsigned long) device
->ccw_mem
, 1);
126 * Make a new device known to the system.
129 dasd_state_new_to_known(struct dasd_device
*device
)
134 * As long as the device is not in state DASD_STATE_NEW we want to
135 * keep the reference count > 0.
137 dasd_get_device(device
);
139 rc
= dasd_alloc_queue(device
);
141 dasd_put_device(device
);
145 device
->state
= DASD_STATE_KNOWN
;
150 * Let the system forget about a device.
153 dasd_state_known_to_new(struct dasd_device
* device
)
155 /* Forget the discipline information. */
156 device
->discipline
= NULL
;
157 device
->state
= DASD_STATE_NEW
;
159 dasd_free_queue(device
);
161 /* Give up reference we took in dasd_state_new_to_known. */
162 dasd_put_device(device
);
166 * Request the irq line for the device.
169 dasd_state_known_to_basic(struct dasd_device
* device
)
173 /* Allocate and register gendisk structure. */
174 rc
= dasd_gendisk_alloc(device
);
178 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
179 device
->debug_area
= debug_register(device
->cdev
->dev
.bus_id
, 1, 2,
181 debug_register_view(device
->debug_area
, &debug_sprintf_view
);
182 debug_set_level(device
->debug_area
, DBF_EMERG
);
183 DBF_DEV_EVENT(DBF_EMERG
, device
, "%s", "debug area created");
185 device
->state
= DASD_STATE_BASIC
;
190 * Release the irq line for the device. Terminate any running i/o.
193 dasd_state_basic_to_known(struct dasd_device
* device
)
195 dasd_gendisk_free(device
);
196 dasd_flush_ccw_queue(device
, 1);
197 DBF_DEV_EVENT(DBF_EMERG
, device
, "%p debug area deleted", device
);
198 if (device
->debug_area
!= NULL
) {
199 debug_unregister(device
->debug_area
);
200 device
->debug_area
= NULL
;
202 device
->state
= DASD_STATE_KNOWN
;
206 * Do the initial analysis. The do_analysis function may return
207 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
208 * until the discipline decides to continue the startup sequence
209 * by calling the function dasd_change_state. The eckd disciplines
210 * uses this to start a ccw that detects the format. The completion
211 * interrupt for this detection ccw uses the kernel event daemon to
212 * trigger the call to dasd_change_state. All this is done in the
213 * discipline code, see dasd_eckd.c.
214 * After the analysis ccw is done (do_analysis returned 0 or error)
215 * the block device is setup. Either a fake disk is added to allow
216 * formatting or a proper device request queue is created.
219 dasd_state_basic_to_ready(struct dasd_device
* device
)
224 if (device
->discipline
->do_analysis
!= NULL
)
225 rc
= device
->discipline
->do_analysis(device
);
228 dasd_setup_queue(device
);
229 device
->state
= DASD_STATE_READY
;
230 if (dasd_scan_partitions(device
) != 0)
231 device
->state
= DASD_STATE_BASIC
;
236 * Remove device from block device layer. Destroy dirty buffers.
237 * Forget format information. Check if the target level is basic
238 * and if it is create fake disk for formatting.
241 dasd_state_ready_to_basic(struct dasd_device
* device
)
243 dasd_flush_ccw_queue(device
, 0);
244 dasd_destroy_partitions(device
);
245 dasd_flush_request_queue(device
);
247 device
->bp_block
= 0;
248 device
->s2b_shift
= 0;
249 device
->state
= DASD_STATE_BASIC
;
253 * Make the device online and schedule the bottom half to start
254 * the requeueing of requests from the linux request queue to the
258 dasd_state_ready_to_online(struct dasd_device
* device
)
260 device
->state
= DASD_STATE_ONLINE
;
261 dasd_schedule_bh(device
);
266 * Stop the requeueing of requests again.
269 dasd_state_online_to_ready(struct dasd_device
* device
)
271 device
->state
= DASD_STATE_READY
;
275 * Device startup state changes.
278 dasd_increase_state(struct dasd_device
*device
)
283 if (device
->state
== DASD_STATE_NEW
&&
284 device
->target
>= DASD_STATE_KNOWN
)
285 rc
= dasd_state_new_to_known(device
);
288 device
->state
== DASD_STATE_KNOWN
&&
289 device
->target
>= DASD_STATE_BASIC
)
290 rc
= dasd_state_known_to_basic(device
);
293 device
->state
== DASD_STATE_BASIC
&&
294 device
->target
>= DASD_STATE_READY
)
295 rc
= dasd_state_basic_to_ready(device
);
298 device
->state
== DASD_STATE_READY
&&
299 device
->target
>= DASD_STATE_ONLINE
)
300 rc
= dasd_state_ready_to_online(device
);
306 * Device shutdown state changes.
309 dasd_decrease_state(struct dasd_device
*device
)
311 if (device
->state
== DASD_STATE_ONLINE
&&
312 device
->target
<= DASD_STATE_READY
)
313 dasd_state_online_to_ready(device
);
315 if (device
->state
== DASD_STATE_READY
&&
316 device
->target
<= DASD_STATE_BASIC
)
317 dasd_state_ready_to_basic(device
);
319 if (device
->state
== DASD_STATE_BASIC
&&
320 device
->target
<= DASD_STATE_KNOWN
)
321 dasd_state_basic_to_known(device
);
323 if (device
->state
== DASD_STATE_KNOWN
&&
324 device
->target
<= DASD_STATE_NEW
)
325 dasd_state_known_to_new(device
);
331 * This is the main startup/shutdown routine.
334 dasd_change_state(struct dasd_device
*device
)
338 if (device
->state
== device
->target
)
339 /* Already where we want to go today... */
341 if (device
->state
< device
->target
)
342 rc
= dasd_increase_state(device
);
344 rc
= dasd_decrease_state(device
);
345 if (rc
&& rc
!= -EAGAIN
)
346 device
->target
= device
->state
;
348 if (device
->state
== device
->target
)
349 wake_up(&dasd_init_waitq
);
353 * Kick starter for devices that did not complete the startup/shutdown
354 * procedure or were sleeping because of a pending state.
355 * dasd_kick_device will schedule a call do do_kick_device to the kernel
359 do_kick_device(void *data
)
361 struct dasd_device
*device
;
363 device
= (struct dasd_device
*) data
;
364 dasd_change_state(device
);
365 dasd_schedule_bh(device
);
366 dasd_put_device(device
);
370 dasd_kick_device(struct dasd_device
*device
)
372 dasd_get_device(device
);
373 /* queue call to dasd_kick_device to the kernel event daemon. */
374 schedule_work(&device
->kick_work
);
378 * Set the target state for a device and starts the state change.
381 dasd_set_target_state(struct dasd_device
*device
, int target
)
383 /* If we are in probeonly mode stop at DASD_STATE_READY. */
384 if (dasd_probeonly
&& target
> DASD_STATE_READY
)
385 target
= DASD_STATE_READY
;
386 if (device
->target
!= target
) {
387 if (device
->state
== target
)
388 wake_up(&dasd_init_waitq
);
389 device
->target
= target
;
391 if (device
->state
!= device
->target
)
392 dasd_change_state(device
);
396 * Enable devices with device numbers in [from..to].
399 _wait_for_device(struct dasd_device
*device
)
401 return (device
->state
== device
->target
);
405 dasd_enable_device(struct dasd_device
*device
)
407 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
408 if (device
->state
<= DASD_STATE_KNOWN
)
409 /* No discipline for device found. */
410 dasd_set_target_state(device
, DASD_STATE_NEW
);
411 /* Now wait for the devices to come up. */
412 wait_event(dasd_init_waitq
, _wait_for_device(device
));
416 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
418 #ifdef CONFIG_DASD_PROFILE
420 struct dasd_profile_info_t dasd_global_profile
;
421 unsigned int dasd_profile_level
= DASD_PROFILE_OFF
;
424 * Increments counter in global and local profiling structures.
426 #define dasd_profile_counter(value, counter, device) \
429 for (index = 0; index < 31 && value >> (2+index); index++); \
430 dasd_global_profile.counter[index]++; \
431 device->profile.counter[index]++; \
435 * Add profiling information for cqr before execution.
438 dasd_profile_start(struct dasd_device
*device
, struct dasd_ccw_req
* cqr
,
442 unsigned int counter
;
444 if (dasd_profile_level
!= DASD_PROFILE_ON
)
447 /* count the length of the chanq for statistics */
449 list_for_each(l
, &device
->ccw_queue
)
452 dasd_global_profile
.dasd_io_nr_req
[counter
]++;
453 device
->profile
.dasd_io_nr_req
[counter
]++;
457 * Add profiling information for cqr after execution.
460 dasd_profile_end(struct dasd_device
*device
, struct dasd_ccw_req
* cqr
,
463 long strtime
, irqtime
, endtime
, tottime
; /* in microseconds */
464 long tottimeps
, sectors
;
466 if (dasd_profile_level
!= DASD_PROFILE_ON
)
469 sectors
= req
->nr_sectors
;
470 if (!cqr
->buildclk
|| !cqr
->startclk
||
471 !cqr
->stopclk
|| !cqr
->endclk
||
475 strtime
= ((cqr
->startclk
- cqr
->buildclk
) >> 12);
476 irqtime
= ((cqr
->stopclk
- cqr
->startclk
) >> 12);
477 endtime
= ((cqr
->endclk
- cqr
->stopclk
) >> 12);
478 tottime
= ((cqr
->endclk
- cqr
->buildclk
) >> 12);
479 tottimeps
= tottime
/ sectors
;
481 if (!dasd_global_profile
.dasd_io_reqs
)
482 memset(&dasd_global_profile
, 0,
483 sizeof (struct dasd_profile_info_t
));
484 dasd_global_profile
.dasd_io_reqs
++;
485 dasd_global_profile
.dasd_io_sects
+= sectors
;
487 if (!device
->profile
.dasd_io_reqs
)
488 memset(&device
->profile
, 0,
489 sizeof (struct dasd_profile_info_t
));
490 device
->profile
.dasd_io_reqs
++;
491 device
->profile
.dasd_io_sects
+= sectors
;
493 dasd_profile_counter(sectors
, dasd_io_secs
, device
);
494 dasd_profile_counter(tottime
, dasd_io_times
, device
);
495 dasd_profile_counter(tottimeps
, dasd_io_timps
, device
);
496 dasd_profile_counter(strtime
, dasd_io_time1
, device
);
497 dasd_profile_counter(irqtime
, dasd_io_time2
, device
);
498 dasd_profile_counter(irqtime
/ sectors
, dasd_io_time2ps
, device
);
499 dasd_profile_counter(endtime
, dasd_io_time3
, device
);
502 #define dasd_profile_start(device, cqr, req) do {} while (0)
503 #define dasd_profile_end(device, cqr, req) do {} while (0)
504 #endif /* CONFIG_DASD_PROFILE */
507 * Allocate memory for a channel program with 'cplength' channel
508 * command words and 'datasize' additional space. There are two
509 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
510 * memory and 2) dasd_smalloc_request uses the static ccw memory
511 * that gets allocated for each device.
513 struct dasd_ccw_req
*
514 dasd_kmalloc_request(char *magic
, int cplength
, int datasize
,
515 struct dasd_device
* device
)
517 struct dasd_ccw_req
*cqr
;
520 if ( magic
== NULL
|| datasize
> PAGE_SIZE
||
521 (cplength
*sizeof(struct ccw1
)) > PAGE_SIZE
)
524 cqr
= kmalloc(sizeof(struct dasd_ccw_req
), GFP_ATOMIC
);
526 return ERR_PTR(-ENOMEM
);
527 memset(cqr
, 0, sizeof(struct dasd_ccw_req
));
530 cqr
->cpaddr
= kmalloc(cplength
*sizeof(struct ccw1
),
531 GFP_ATOMIC
| GFP_DMA
);
532 if (cqr
->cpaddr
== NULL
) {
534 return ERR_PTR(-ENOMEM
);
536 memset(cqr
->cpaddr
, 0, cplength
*sizeof(struct ccw1
));
540 cqr
->data
= kmalloc(datasize
, GFP_ATOMIC
| GFP_DMA
);
541 if (cqr
->data
== NULL
) {
544 return ERR_PTR(-ENOMEM
);
546 memset(cqr
->data
, 0, datasize
);
548 strncpy((char *) &cqr
->magic
, magic
, 4);
549 ASCEBC((char *) &cqr
->magic
, 4);
550 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
551 dasd_get_device(device
);
555 struct dasd_ccw_req
*
556 dasd_smalloc_request(char *magic
, int cplength
, int datasize
,
557 struct dasd_device
* device
)
560 struct dasd_ccw_req
*cqr
;
565 if ( magic
== NULL
|| datasize
> PAGE_SIZE
||
566 (cplength
*sizeof(struct ccw1
)) > PAGE_SIZE
)
569 size
= (sizeof(struct dasd_ccw_req
) + 7L) & -8L;
571 size
+= cplength
* sizeof(struct ccw1
);
574 spin_lock_irqsave(&device
->mem_lock
, flags
);
575 cqr
= (struct dasd_ccw_req
*)
576 dasd_alloc_chunk(&device
->ccw_chunks
, size
);
577 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
579 return ERR_PTR(-ENOMEM
);
580 memset(cqr
, 0, sizeof(struct dasd_ccw_req
));
581 data
= (char *) cqr
+ ((sizeof(struct dasd_ccw_req
) + 7L) & -8L);
584 cqr
->cpaddr
= (struct ccw1
*) data
;
585 data
+= cplength
*sizeof(struct ccw1
);
586 memset(cqr
->cpaddr
, 0, cplength
*sizeof(struct ccw1
));
591 memset(cqr
->data
, 0, datasize
);
593 strncpy((char *) &cqr
->magic
, magic
, 4);
594 ASCEBC((char *) &cqr
->magic
, 4);
595 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
596 dasd_get_device(device
);
601 * Free memory of a channel program. This function needs to free all the
602 * idal lists that might have been created by dasd_set_cda and the
603 * struct dasd_ccw_req itself.
606 dasd_kfree_request(struct dasd_ccw_req
* cqr
, struct dasd_device
* device
)
611 /* Clear any idals used for the request. */
614 clear_normalized_cda(ccw
);
615 } while (ccw
++->flags
& (CCW_FLAG_CC
| CCW_FLAG_DC
));
620 dasd_put_device(device
);
624 dasd_sfree_request(struct dasd_ccw_req
* cqr
, struct dasd_device
* device
)
628 spin_lock_irqsave(&device
->mem_lock
, flags
);
629 dasd_free_chunk(&device
->ccw_chunks
, cqr
);
630 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
631 dasd_put_device(device
);
635 * Check discipline magic in cqr.
638 dasd_check_cqr(struct dasd_ccw_req
*cqr
)
640 struct dasd_device
*device
;
644 device
= cqr
->device
;
645 if (strncmp((char *) &cqr
->magic
, device
->discipline
->ebcname
, 4)) {
646 DEV_MESSAGE(KERN_WARNING
, device
,
647 " dasd_ccw_req 0x%08x magic doesn't match"
648 " discipline 0x%08x",
650 *(unsigned int *) device
->discipline
->name
);
657 * Terminate the current i/o and set the request to clear_pending.
658 * Timer keeps device runnig.
659 * ccw_device_clear can fail if the i/o subsystem
663 dasd_term_IO(struct dasd_ccw_req
* cqr
)
665 struct dasd_device
*device
;
669 rc
= dasd_check_cqr(cqr
);
673 device
= (struct dasd_device
*) cqr
->device
;
674 while ((retries
< 5) && (cqr
->status
== DASD_CQR_IN_IO
)) {
675 rc
= ccw_device_clear(device
->cdev
, (long) cqr
);
677 case 0: /* termination successful */
678 if (cqr
->retries
> 0) {
680 cqr
->status
= DASD_CQR_CLEAR
;
682 cqr
->status
= DASD_CQR_FAILED
;
683 cqr
->stopclk
= get_clock();
684 DBF_DEV_EVENT(DBF_DEBUG
, device
,
685 "terminate cqr %p successful",
689 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
690 "device gone, retry");
693 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
698 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
699 "device busy, retry later");
702 DEV_MESSAGE(KERN_ERR
, device
,
703 "line %d unknown RC=%d, please "
704 "report to linux390@de.ibm.com",
711 dasd_schedule_bh(device
);
716 * Start the i/o. This start_IO can fail if the channel is really busy.
717 * In that case set up a timer to start the request later.
720 dasd_start_IO(struct dasd_ccw_req
* cqr
)
722 struct dasd_device
*device
;
726 rc
= dasd_check_cqr(cqr
);
729 device
= (struct dasd_device
*) cqr
->device
;
730 if (cqr
->retries
< 0) {
731 DEV_MESSAGE(KERN_DEBUG
, device
,
732 "start_IO: request %p (%02x/%i) - no retry left.",
733 cqr
, cqr
->status
, cqr
->retries
);
734 cqr
->status
= DASD_CQR_FAILED
;
737 cqr
->startclk
= get_clock();
738 cqr
->starttime
= jiffies
;
740 rc
= ccw_device_start(device
->cdev
, cqr
->cpaddr
, (long) cqr
,
744 cqr
->status
= DASD_CQR_IN_IO
;
745 DBF_DEV_EVENT(DBF_DEBUG
, device
,
746 "start_IO: request %p started successful",
750 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
751 "start_IO: device busy, retry later");
754 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
755 "start_IO: request timeout, retry later");
758 /* -EACCES indicates that the request used only a
759 * subset of the available pathes and all these
761 * Do a retry with all available pathes.
763 cqr
->lpm
= LPM_ANYPATH
;
764 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
765 "start_IO: selected pathes gone,"
766 " retry on all pathes");
770 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
771 "start_IO: device gone, retry");
774 DEV_MESSAGE(KERN_ERR
, device
,
775 "line %d unknown RC=%d, please report"
776 " to linux390@de.ibm.com", __LINE__
, rc
);
784 * Timeout function for dasd devices. This is used for different purposes
785 * 1) missing interrupt handler for normal operation
786 * 2) delayed start of request where start_IO failed with -EBUSY
787 * 3) timeout for missing state change interrupts
788 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
789 * DASD_CQR_QUEUED for 2) and 3).
792 dasd_timeout_device(unsigned long ptr
)
795 struct dasd_device
*device
;
797 device
= (struct dasd_device
*) ptr
;
798 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
799 /* re-activate request queue */
800 device
->stopped
&= ~DASD_STOPPED_PENDING
;
801 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
802 dasd_schedule_bh(device
);
806 * Setup timeout for a device in jiffies.
809 dasd_set_timer(struct dasd_device
*device
, int expires
)
812 if (timer_pending(&device
->timer
))
813 del_timer(&device
->timer
);
816 if (timer_pending(&device
->timer
)) {
817 if (mod_timer(&device
->timer
, jiffies
+ expires
))
820 device
->timer
.function
= dasd_timeout_device
;
821 device
->timer
.data
= (unsigned long) device
;
822 device
->timer
.expires
= jiffies
+ expires
;
823 add_timer(&device
->timer
);
827 * Clear timeout for a device.
830 dasd_clear_timer(struct dasd_device
*device
)
832 if (timer_pending(&device
->timer
))
833 del_timer(&device
->timer
);
837 dasd_handle_killed_request(struct ccw_device
*cdev
, unsigned long intparm
)
839 struct dasd_ccw_req
*cqr
;
840 struct dasd_device
*device
;
842 cqr
= (struct dasd_ccw_req
*) intparm
;
843 if (cqr
->status
!= DASD_CQR_IN_IO
) {
845 "invalid status in handle_killed_request: "
846 "bus_id %s, status %02x",
847 cdev
->dev
.bus_id
, cqr
->status
);
851 device
= (struct dasd_device
*) cqr
->device
;
852 if (device
== NULL
||
853 device
!= dasd_device_from_cdev(cdev
) ||
854 strncmp(device
->discipline
->ebcname
, (char *) &cqr
->magic
, 4)) {
855 MESSAGE(KERN_DEBUG
, "invalid device in request: bus_id %s",
860 /* Schedule request to be retried. */
861 cqr
->status
= DASD_CQR_QUEUED
;
863 dasd_clear_timer(device
);
864 dasd_schedule_bh(device
);
865 dasd_put_device(device
);
869 dasd_handle_state_change_pending(struct dasd_device
*device
)
871 struct dasd_ccw_req
*cqr
;
872 struct list_head
*l
, *n
;
874 device
->stopped
&= ~DASD_STOPPED_PENDING
;
876 /* restart all 'running' IO on queue */
877 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
878 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
879 if (cqr
->status
== DASD_CQR_IN_IO
) {
880 cqr
->status
= DASD_CQR_QUEUED
;
883 dasd_clear_timer(device
);
884 dasd_schedule_bh(device
);
888 * Interrupt handler for "normal" ssch-io based dasd devices.
891 dasd_int_handler(struct ccw_device
*cdev
, unsigned long intparm
,
894 struct dasd_ccw_req
*cqr
, *next
;
895 struct dasd_device
*device
;
896 unsigned long long now
;
902 switch (PTR_ERR(irb
)) {
904 dasd_handle_killed_request(cdev
, intparm
);
907 printk(KERN_WARNING
"%s(%s): request timed out\n",
908 __FUNCTION__
, cdev
->dev
.bus_id
);
909 //FIXME - dasd uses own timeout interface...
912 printk(KERN_WARNING
"%s(%s): unknown error %ld\n",
913 __FUNCTION__
, cdev
->dev
.bus_id
, PTR_ERR(irb
));
920 DBF_EVENT(DBF_ERR
, "Interrupt: bus_id %s CS/DS %04x ip %08x",
921 cdev
->dev
.bus_id
, ((irb
->scsw
.cstat
<<8)|irb
->scsw
.dstat
),
922 (unsigned int) intparm
);
924 /* first of all check for state change pending interrupt */
925 mask
= DEV_STAT_ATTENTION
| DEV_STAT_DEV_END
| DEV_STAT_UNIT_EXCEP
;
926 if ((irb
->scsw
.dstat
& mask
) == mask
) {
927 device
= dasd_device_from_cdev(cdev
);
928 if (!IS_ERR(device
)) {
929 dasd_handle_state_change_pending(device
);
930 dasd_put_device(device
);
935 cqr
= (struct dasd_ccw_req
*) intparm
;
937 /* check for unsolicited interrupts */
940 "unsolicited interrupt received: bus_id %s",
945 device
= (struct dasd_device
*) cqr
->device
;
946 if (device
== NULL
||
947 strncmp(device
->discipline
->ebcname
, (char *) &cqr
->magic
, 4)) {
948 MESSAGE(KERN_DEBUG
, "invalid device in request: bus_id %s",
953 /* Check for clear pending */
954 if (cqr
->status
== DASD_CQR_CLEAR
&&
955 irb
->scsw
.fctl
& SCSW_FCTL_CLEAR_FUNC
) {
956 cqr
->status
= DASD_CQR_QUEUED
;
957 dasd_clear_timer(device
);
958 dasd_schedule_bh(device
);
962 /* check status - the request might have been killed by dyn detach */
963 if (cqr
->status
!= DASD_CQR_IN_IO
) {
965 "invalid status: bus_id %s, status %02x",
966 cdev
->dev
.bus_id
, cqr
->status
);
969 DBF_DEV_EVENT(DBF_DEBUG
, device
, "Int: CS/DS 0x%04x for cqr %p",
970 ((irb
->scsw
.cstat
<< 8) | irb
->scsw
.dstat
), cqr
);
972 /* Find out the appropriate era_action. */
973 if (irb
->scsw
.fctl
& SCSW_FCTL_HALT_FUNC
)
974 era
= dasd_era_fatal
;
975 else if (irb
->scsw
.dstat
== (DEV_STAT_CHN_END
| DEV_STAT_DEV_END
) &&
976 irb
->scsw
.cstat
== 0 &&
977 !irb
->esw
.esw0
.erw
.cons
)
979 else if (!test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
))
980 era
= dasd_era_fatal
; /* don't recover this request */
981 else if (irb
->esw
.esw0
.erw
.cons
)
982 era
= device
->discipline
->examine_error(cqr
, irb
);
984 era
= dasd_era_recover
;
986 DBF_DEV_EVENT(DBF_DEBUG
, device
, "era_code %d", era
);
988 if (era
== dasd_era_none
) {
989 cqr
->status
= DASD_CQR_DONE
;
991 /* Start first request on queue if possible -> fast_io. */
992 if (cqr
->list
.next
!= &device
->ccw_queue
) {
993 next
= list_entry(cqr
->list
.next
,
994 struct dasd_ccw_req
, list
);
995 if ((next
->status
== DASD_CQR_QUEUED
) &&
996 (!device
->stopped
)) {
997 if (device
->discipline
->start_IO(next
) == 0)
998 expires
= next
->expires
;
1000 DEV_MESSAGE(KERN_DEBUG
, device
, "%s",
1001 "Interrupt fastpath "
1005 } else { /* error */
1006 memcpy(&cqr
->irb
, irb
, sizeof (struct irb
));
1008 /* dump sense data */
1009 dasd_log_sense(cqr
, irb
);
1012 case dasd_era_fatal
:
1013 cqr
->status
= DASD_CQR_FAILED
;
1016 case dasd_era_recover
:
1017 cqr
->status
= DASD_CQR_ERROR
;
1024 dasd_set_timer(device
, expires
);
1026 dasd_clear_timer(device
);
1027 dasd_schedule_bh(device
);
1031 * posts the buffer_cache about a finalized request
1034 dasd_end_request(struct request
*req
, int uptodate
)
1036 if (end_that_request_first(req
, uptodate
, req
->hard_nr_sectors
))
1038 add_disk_randomness(req
->rq_disk
);
1039 end_that_request_last(req
, uptodate
);
1043 * Process finished error recovery ccw.
1046 __dasd_process_erp(struct dasd_device
*device
, struct dasd_ccw_req
*cqr
)
1048 dasd_erp_fn_t erp_fn
;
1050 if (cqr
->status
== DASD_CQR_DONE
)
1051 DBF_DEV_EVENT(DBF_NOTICE
, device
, "%s", "ERP successful");
1053 DEV_MESSAGE(KERN_ERR
, device
, "%s", "ERP unsuccessful");
1054 erp_fn
= device
->discipline
->erp_postaction(cqr
);
1059 * Process ccw request queue.
1062 __dasd_process_ccw_queue(struct dasd_device
* device
,
1063 struct list_head
*final_queue
)
1065 struct list_head
*l
, *n
;
1066 struct dasd_ccw_req
*cqr
;
1067 dasd_erp_fn_t erp_fn
;
1070 /* Process request with final status. */
1071 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1072 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
1073 /* Stop list processing at the first non-final request. */
1074 if (cqr
->status
!= DASD_CQR_DONE
&&
1075 cqr
->status
!= DASD_CQR_FAILED
&&
1076 cqr
->status
!= DASD_CQR_ERROR
)
1078 /* Process requests with DASD_CQR_ERROR */
1079 if (cqr
->status
== DASD_CQR_ERROR
) {
1080 if (cqr
->irb
.scsw
.fctl
& SCSW_FCTL_HALT_FUNC
) {
1081 cqr
->status
= DASD_CQR_FAILED
;
1082 cqr
->stopclk
= get_clock();
1084 if (cqr
->irb
.esw
.esw0
.erw
.cons
) {
1085 erp_fn
= device
->discipline
->
1089 dasd_default_erp_action(cqr
);
1093 /* Process finished ERP request. */
1095 __dasd_process_erp(device
, cqr
);
1099 /* Rechain finished requests to final queue */
1100 cqr
->endclk
= get_clock();
1101 list_move_tail(&cqr
->list
, final_queue
);
1106 dasd_end_request_cb(struct dasd_ccw_req
* cqr
, void *data
)
1108 struct request
*req
;
1109 struct dasd_device
*device
;
1112 req
= (struct request
*) data
;
1113 device
= cqr
->device
;
1114 dasd_profile_end(device
, cqr
, req
);
1115 status
= cqr
->device
->discipline
->free_cp(cqr
,req
);
1116 spin_lock_irq(&device
->request_queue_lock
);
1117 dasd_end_request(req
, status
);
1118 spin_unlock_irq(&device
->request_queue_lock
);
1123 * Fetch requests from the block device queue.
1126 __dasd_process_blk_queue(struct dasd_device
* device
)
1128 request_queue_t
*queue
;
1129 struct request
*req
;
1130 struct dasd_ccw_req
*cqr
;
1133 queue
= device
->request_queue
;
1134 /* No queue ? Then there is nothing to do. */
1139 * We requeue request from the block device queue to the ccw
1140 * queue only in two states. In state DASD_STATE_READY the
1141 * partition detection is done and we need to requeue requests
1142 * for that. State DASD_STATE_ONLINE is normal block device
1145 if (device
->state
!= DASD_STATE_READY
&&
1146 device
->state
!= DASD_STATE_ONLINE
)
1149 /* Now we try to fetch requests from the request queue */
1150 list_for_each_entry(cqr
, &device
->ccw_queue
, list
)
1151 if (cqr
->status
== DASD_CQR_QUEUED
)
1153 while (!blk_queue_plugged(queue
) &&
1154 elv_next_request(queue
) &&
1155 nr_queued
< DASD_CHANQ_MAX_SIZE
) {
1156 req
= elv_next_request(queue
);
1158 if (device
->features
& DASD_FEATURE_READONLY
&&
1159 rq_data_dir(req
) == WRITE
) {
1160 DBF_DEV_EVENT(DBF_ERR
, device
,
1161 "Rejecting write request %p",
1163 blkdev_dequeue_request(req
);
1164 dasd_end_request(req
, 0);
1167 if (device
->stopped
& DASD_STOPPED_DC_EIO
) {
1168 blkdev_dequeue_request(req
);
1169 dasd_end_request(req
, 0);
1172 cqr
= device
->discipline
->build_cp(device
, req
);
1174 if (PTR_ERR(cqr
) == -ENOMEM
)
1175 break; /* terminate request queue loop */
1176 DBF_DEV_EVENT(DBF_ERR
, device
,
1177 "CCW creation failed (rc=%ld) "
1180 blkdev_dequeue_request(req
);
1181 dasd_end_request(req
, 0);
1184 cqr
->callback
= dasd_end_request_cb
;
1185 cqr
->callback_data
= (void *) req
;
1186 cqr
->status
= DASD_CQR_QUEUED
;
1187 blkdev_dequeue_request(req
);
1188 list_add_tail(&cqr
->list
, &device
->ccw_queue
);
1189 dasd_profile_start(device
, cqr
, req
);
1195 * Take a look at the first request on the ccw queue and check
1196 * if it reached its expire time. If so, terminate the IO.
1199 __dasd_check_expire(struct dasd_device
* device
)
1201 struct dasd_ccw_req
*cqr
;
1203 if (list_empty(&device
->ccw_queue
))
1205 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, list
);
1206 if (cqr
->status
== DASD_CQR_IN_IO
&& cqr
->expires
!= 0) {
1207 if (time_after_eq(jiffies
, cqr
->expires
+ cqr
->starttime
)) {
1208 if (device
->discipline
->term_IO(cqr
) != 0)
1209 /* Hmpf, try again in 1/10 sec */
1210 dasd_set_timer(device
, 10);
1216 * Take a look at the first request on the ccw queue and check
1217 * if it needs to be started.
1220 __dasd_start_head(struct dasd_device
* device
)
1222 struct dasd_ccw_req
*cqr
;
1225 if (list_empty(&device
->ccw_queue
))
1227 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, list
);
1228 /* check FAILFAST */
1229 if (device
->stopped
& ~DASD_STOPPED_PENDING
&&
1230 test_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
)) {
1231 cqr
->status
= DASD_CQR_FAILED
;
1232 dasd_schedule_bh(device
);
1234 if ((cqr
->status
== DASD_CQR_QUEUED
) &&
1235 (!device
->stopped
)) {
1236 /* try to start the first I/O that can be started */
1237 rc
= device
->discipline
->start_IO(cqr
);
1239 dasd_set_timer(device
, cqr
->expires
);
1240 else if (rc
== -EACCES
) {
1241 dasd_schedule_bh(device
);
1243 /* Hmpf, try again in 1/2 sec */
1244 dasd_set_timer(device
, 50);
1249 * Remove requests from the ccw queue.
1252 dasd_flush_ccw_queue(struct dasd_device
* device
, int all
)
1254 struct list_head flush_queue
;
1255 struct list_head
*l
, *n
;
1256 struct dasd_ccw_req
*cqr
;
1258 INIT_LIST_HEAD(&flush_queue
);
1259 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1260 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1261 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
1262 /* Flush all request or only block device requests? */
1263 if (all
== 0 && cqr
->callback
== dasd_end_request_cb
)
1265 if (cqr
->status
== DASD_CQR_IN_IO
)
1266 device
->discipline
->term_IO(cqr
);
1267 if (cqr
->status
!= DASD_CQR_DONE
||
1268 cqr
->status
!= DASD_CQR_FAILED
) {
1269 cqr
->status
= DASD_CQR_FAILED
;
1270 cqr
->stopclk
= get_clock();
1272 /* Process finished ERP request. */
1274 __dasd_process_erp(device
, cqr
);
1277 /* Rechain request on device request queue */
1278 cqr
->endclk
= get_clock();
1279 list_move_tail(&cqr
->list
, &flush_queue
);
1281 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1282 /* Now call the callback function of flushed requests */
1283 list_for_each_safe(l
, n
, &flush_queue
) {
1284 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
1285 if (cqr
->callback
!= NULL
)
1286 (cqr
->callback
)(cqr
, cqr
->callback_data
);
1291 * Acquire the device lock and process queues for the device.
1294 dasd_tasklet(struct dasd_device
* device
)
1296 struct list_head final_queue
;
1297 struct list_head
*l
, *n
;
1298 struct dasd_ccw_req
*cqr
;
1300 atomic_set (&device
->tasklet_scheduled
, 0);
1301 INIT_LIST_HEAD(&final_queue
);
1302 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1303 /* Check expire time of first request on the ccw queue. */
1304 __dasd_check_expire(device
);
1305 /* Finish off requests on ccw queue */
1306 __dasd_process_ccw_queue(device
, &final_queue
);
1307 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1308 /* Now call the callback function of requests with final status */
1309 list_for_each_safe(l
, n
, &final_queue
) {
1310 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
1311 list_del(&cqr
->list
);
1312 if (cqr
->callback
!= NULL
)
1313 (cqr
->callback
)(cqr
, cqr
->callback_data
);
1315 spin_lock_irq(&device
->request_queue_lock
);
1316 spin_lock(get_ccwdev_lock(device
->cdev
));
1317 /* Get new request from the block device request queue */
1318 __dasd_process_blk_queue(device
);
1319 /* Now check if the head of the ccw queue needs to be started. */
1320 __dasd_start_head(device
);
1321 spin_unlock(get_ccwdev_lock(device
->cdev
));
1322 spin_unlock_irq(&device
->request_queue_lock
);
1323 dasd_put_device(device
);
1327 * Schedules a call to dasd_tasklet over the device tasklet.
1330 dasd_schedule_bh(struct dasd_device
* device
)
1332 /* Protect against rescheduling. */
1333 if (atomic_cmpxchg (&device
->tasklet_scheduled
, 0, 1) != 0)
1335 dasd_get_device(device
);
1336 tasklet_hi_schedule(&device
->tasklet
);
1340 * Queue a request to the head of the ccw_queue. Start the I/O if
1344 dasd_add_request_head(struct dasd_ccw_req
*req
)
1346 struct dasd_device
*device
;
1347 unsigned long flags
;
1349 device
= req
->device
;
1350 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1351 req
->status
= DASD_CQR_QUEUED
;
1352 req
->device
= device
;
1353 list_add(&req
->list
, &device
->ccw_queue
);
1354 /* let the bh start the request to keep them in order */
1355 dasd_schedule_bh(device
);
1356 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1360 * Queue a request to the tail of the ccw_queue. Start the I/O if
1364 dasd_add_request_tail(struct dasd_ccw_req
*req
)
1366 struct dasd_device
*device
;
1367 unsigned long flags
;
1369 device
= req
->device
;
1370 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1371 req
->status
= DASD_CQR_QUEUED
;
1372 req
->device
= device
;
1373 list_add_tail(&req
->list
, &device
->ccw_queue
);
1374 /* let the bh start the request to keep them in order */
1375 dasd_schedule_bh(device
);
1376 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1383 dasd_wakeup_cb(struct dasd_ccw_req
*cqr
, void *data
)
1385 wake_up((wait_queue_head_t
*) data
);
1389 _wait_for_wakeup(struct dasd_ccw_req
*cqr
)
1391 struct dasd_device
*device
;
1394 device
= cqr
->device
;
1395 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1396 rc
= cqr
->status
== DASD_CQR_DONE
|| cqr
->status
== DASD_CQR_FAILED
;
1397 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1402 * Attempts to start a special ccw queue and waits for its completion.
1405 dasd_sleep_on(struct dasd_ccw_req
* cqr
)
1407 wait_queue_head_t wait_q
;
1408 struct dasd_device
*device
;
1411 device
= cqr
->device
;
1412 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1414 init_waitqueue_head (&wait_q
);
1415 cqr
->callback
= dasd_wakeup_cb
;
1416 cqr
->callback_data
= (void *) &wait_q
;
1417 cqr
->status
= DASD_CQR_QUEUED
;
1418 list_add_tail(&cqr
->list
, &device
->ccw_queue
);
1420 /* let the bh start the request to keep them in order */
1421 dasd_schedule_bh(device
);
1423 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1425 wait_event(wait_q
, _wait_for_wakeup(cqr
));
1427 /* Request status is either done or failed. */
1428 rc
= (cqr
->status
== DASD_CQR_FAILED
) ? -EIO
: 0;
1433 * Attempts to start a special ccw queue and wait interruptible
1434 * for its completion.
1437 dasd_sleep_on_interruptible(struct dasd_ccw_req
* cqr
)
1439 wait_queue_head_t wait_q
;
1440 struct dasd_device
*device
;
1443 device
= cqr
->device
;
1444 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1446 init_waitqueue_head (&wait_q
);
1447 cqr
->callback
= dasd_wakeup_cb
;
1448 cqr
->callback_data
= (void *) &wait_q
;
1449 cqr
->status
= DASD_CQR_QUEUED
;
1450 list_add_tail(&cqr
->list
, &device
->ccw_queue
);
1452 /* let the bh start the request to keep them in order */
1453 dasd_schedule_bh(device
);
1454 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1458 rc
= wait_event_interruptible(wait_q
, _wait_for_wakeup(cqr
));
1459 if (rc
!= -ERESTARTSYS
) {
1460 /* Request status is either done or failed. */
1461 rc
= (cqr
->status
== DASD_CQR_FAILED
) ? -EIO
: 0;
1464 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1465 if (cqr
->status
== DASD_CQR_IN_IO
&&
1466 device
->discipline
->term_IO(cqr
) == 0) {
1467 list_del(&cqr
->list
);
1470 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1476 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
1477 * for eckd devices) the currently running request has to be terminated
1478 * and be put back to status queued, before the special request is added
1479 * to the head of the queue. Then the special request is waited on normally.
1482 _dasd_term_running_cqr(struct dasd_device
*device
)
1484 struct dasd_ccw_req
*cqr
;
1487 if (list_empty(&device
->ccw_queue
))
1489 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, list
);
1490 rc
= device
->discipline
->term_IO(cqr
);
1492 /* termination successful */
1493 cqr
->status
= DASD_CQR_QUEUED
;
1494 cqr
->startclk
= cqr
->stopclk
= 0;
1501 dasd_sleep_on_immediatly(struct dasd_ccw_req
* cqr
)
1503 wait_queue_head_t wait_q
;
1504 struct dasd_device
*device
;
1507 device
= cqr
->device
;
1508 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1509 rc
= _dasd_term_running_cqr(device
);
1511 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1515 init_waitqueue_head (&wait_q
);
1516 cqr
->callback
= dasd_wakeup_cb
;
1517 cqr
->callback_data
= (void *) &wait_q
;
1518 cqr
->status
= DASD_CQR_QUEUED
;
1519 list_add(&cqr
->list
, &device
->ccw_queue
);
1521 /* let the bh start the request to keep them in order */
1522 dasd_schedule_bh(device
);
1524 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1526 wait_event(wait_q
, _wait_for_wakeup(cqr
));
1528 /* Request status is either done or failed. */
1529 rc
= (cqr
->status
== DASD_CQR_FAILED
) ? -EIO
: 0;
1534 * Cancels a request that was started with dasd_sleep_on_req.
1535 * This is useful to timeout requests. The request will be
1536 * terminated if it is currently in i/o.
1537 * Returns 1 if the request has been terminated.
1540 dasd_cancel_req(struct dasd_ccw_req
*cqr
)
1542 struct dasd_device
*device
= cqr
->device
;
1543 unsigned long flags
;
1547 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1548 switch (cqr
->status
) {
1549 case DASD_CQR_QUEUED
:
1550 /* request was not started - just set to failed */
1551 cqr
->status
= DASD_CQR_FAILED
;
1553 case DASD_CQR_IN_IO
:
1554 /* request in IO - terminate IO and release again */
1555 if (device
->discipline
->term_IO(cqr
) != 0)
1556 /* what to do if unable to terminate ??????
1558 cqr
->status
= DASD_CQR_FAILED
;
1559 cqr
->stopclk
= get_clock();
1563 case DASD_CQR_FAILED
:
1564 /* already finished - do nothing */
1567 DEV_MESSAGE(KERN_ALERT
, device
,
1568 "invalid status %02x in request",
1573 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1574 dasd_schedule_bh(device
);
1579 * SECTION: Block device operations (request queue, partitions, open, release).
1583 * Dasd request queue function. Called from ll_rw_blk.c
1586 do_dasd_request(request_queue_t
* queue
)
1588 struct dasd_device
*device
;
1590 device
= (struct dasd_device
*) queue
->queuedata
;
1591 spin_lock(get_ccwdev_lock(device
->cdev
));
1592 /* Get new request from the block device request queue */
1593 __dasd_process_blk_queue(device
);
1594 /* Now check if the head of the ccw queue needs to be started. */
1595 __dasd_start_head(device
);
1596 spin_unlock(get_ccwdev_lock(device
->cdev
));
1600 * Allocate and initialize request queue and default I/O scheduler.
1603 dasd_alloc_queue(struct dasd_device
* device
)
1607 device
->request_queue
= blk_init_queue(do_dasd_request
,
1608 &device
->request_queue_lock
);
1609 if (device
->request_queue
== NULL
)
1612 device
->request_queue
->queuedata
= device
;
1614 elevator_exit(device
->request_queue
->elevator
);
1615 rc
= elevator_init(device
->request_queue
, "deadline");
1617 blk_cleanup_queue(device
->request_queue
);
1624 * Allocate and initialize request queue.
1627 dasd_setup_queue(struct dasd_device
* device
)
1631 blk_queue_hardsect_size(device
->request_queue
, device
->bp_block
);
1632 max
= device
->discipline
->max_blocks
<< device
->s2b_shift
;
1633 blk_queue_max_sectors(device
->request_queue
, max
);
1634 blk_queue_max_phys_segments(device
->request_queue
, -1L);
1635 blk_queue_max_hw_segments(device
->request_queue
, -1L);
1636 blk_queue_max_segment_size(device
->request_queue
, -1L);
1637 blk_queue_segment_boundary(device
->request_queue
, -1L);
1638 blk_queue_ordered(device
->request_queue
, 1);
1642 * Deactivate and free request queue.
1645 dasd_free_queue(struct dasd_device
* device
)
1647 if (device
->request_queue
) {
1648 blk_cleanup_queue(device
->request_queue
);
1649 device
->request_queue
= NULL
;
1654 * Flush request on the request queue.
1657 dasd_flush_request_queue(struct dasd_device
* device
)
1659 struct request
*req
;
1661 if (!device
->request_queue
)
1664 spin_lock_irq(&device
->request_queue_lock
);
1665 while (!list_empty(&device
->request_queue
->queue_head
)) {
1666 req
= elv_next_request(device
->request_queue
);
1669 dasd_end_request(req
, 0);
1670 blkdev_dequeue_request(req
);
1672 spin_unlock_irq(&device
->request_queue_lock
);
1676 dasd_open(struct inode
*inp
, struct file
*filp
)
1678 struct gendisk
*disk
= inp
->i_bdev
->bd_disk
;
1679 struct dasd_device
*device
= disk
->private_data
;
1682 atomic_inc(&device
->open_count
);
1683 if (test_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
1688 if (!try_module_get(device
->discipline
->owner
)) {
1693 if (dasd_probeonly
) {
1694 DEV_MESSAGE(KERN_INFO
, device
, "%s",
1695 "No access to device due to probeonly mode");
1700 if (device
->state
< DASD_STATE_BASIC
) {
1701 DBF_DEV_EVENT(DBF_ERR
, device
, " %s",
1702 " Cannot open unrecognized device");
1710 module_put(device
->discipline
->owner
);
1712 atomic_dec(&device
->open_count
);
1717 dasd_release(struct inode
*inp
, struct file
*filp
)
1719 struct gendisk
*disk
= inp
->i_bdev
->bd_disk
;
1720 struct dasd_device
*device
= disk
->private_data
;
1722 atomic_dec(&device
->open_count
);
1723 module_put(device
->discipline
->owner
);
1728 * Return disk geometry.
1731 dasd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
1733 struct dasd_device
*device
;
1735 device
= bdev
->bd_disk
->private_data
;
1739 if (!device
->discipline
||
1740 !device
->discipline
->fill_geometry
)
1743 device
->discipline
->fill_geometry(device
, geo
);
1744 geo
->start
= get_start_sect(bdev
) >> device
->s2b_shift
;
1748 struct block_device_operations
1749 dasd_device_operations
= {
1750 .owner
= THIS_MODULE
,
1752 .release
= dasd_release
,
1753 .ioctl
= dasd_ioctl
,
1754 .compat_ioctl
= dasd_compat_ioctl
,
1755 .getgeo
= dasd_getgeo
,
1762 #ifdef CONFIG_PROC_FS
1766 if (dasd_page_cache
!= NULL
) {
1767 kmem_cache_destroy(dasd_page_cache
);
1768 dasd_page_cache
= NULL
;
1770 dasd_gendisk_exit();
1772 devfs_remove("dasd");
1773 if (dasd_debug_area
!= NULL
) {
1774 debug_unregister(dasd_debug_area
);
1775 dasd_debug_area
= NULL
;
1780 * SECTION: common functions for ccw_driver use
1784 * Initial attempt at a probe function. this can be simplified once
1785 * the other detection code is gone.
1788 dasd_generic_probe (struct ccw_device
*cdev
,
1789 struct dasd_discipline
*discipline
)
1793 ret
= dasd_add_sysfs_files(cdev
);
1796 "dasd_generic_probe: could not add sysfs entries "
1797 "for %s\n", cdev
->dev
.bus_id
);
1799 cdev
->handler
= &dasd_int_handler
;
1806 * This will one day be called from a global not_oper handler.
1807 * It is also used by driver_unregister during module unload.
1810 dasd_generic_remove (struct ccw_device
*cdev
)
1812 struct dasd_device
*device
;
1814 cdev
->handler
= NULL
;
1816 dasd_remove_sysfs_files(cdev
);
1817 device
= dasd_device_from_cdev(cdev
);
1820 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
1821 /* Already doing offline processing */
1822 dasd_put_device(device
);
1826 * This device is removed unconditionally. Set offline
1827 * flag to prevent dasd_open from opening it while it is
1828 * no quite down yet.
1830 dasd_set_target_state(device
, DASD_STATE_NEW
);
1831 /* dasd_delete_device destroys the device reference. */
1832 dasd_delete_device(device
);
1836 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
1837 * the device is detected for the first time and is supposed to be used
1838 * or the user has started activation through sysfs.
1841 dasd_generic_set_online (struct ccw_device
*cdev
,
1842 struct dasd_discipline
*discipline
)
1845 struct dasd_device
*device
;
1848 device
= dasd_create_device(cdev
);
1850 return PTR_ERR(device
);
1852 if (device
->features
& DASD_FEATURE_USEDIAG
) {
1853 if (!dasd_diag_discipline_pointer
) {
1854 printk (KERN_WARNING
1855 "dasd_generic couldn't online device %s "
1856 "- discipline DIAG not available\n",
1858 dasd_delete_device(device
);
1861 discipline
= dasd_diag_discipline_pointer
;
1863 device
->discipline
= discipline
;
1865 rc
= discipline
->check_device(device
);
1867 printk (KERN_WARNING
1868 "dasd_generic couldn't online device %s "
1869 "with discipline %s rc=%i\n",
1870 cdev
->dev
.bus_id
, discipline
->name
, rc
);
1871 dasd_delete_device(device
);
1875 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
1876 if (device
->state
<= DASD_STATE_KNOWN
) {
1877 printk (KERN_WARNING
1878 "dasd_generic discipline not found for %s\n",
1881 dasd_set_target_state(device
, DASD_STATE_NEW
);
1882 dasd_delete_device(device
);
1884 pr_debug("dasd_generic device %s found\n",
1887 /* FIXME: we have to wait for the root device but we don't want
1888 * to wait for each single device but for all at once. */
1889 wait_event(dasd_init_waitq
, _wait_for_device(device
));
1891 dasd_put_device(device
);
1897 dasd_generic_set_offline (struct ccw_device
*cdev
)
1899 struct dasd_device
*device
;
1902 device
= dasd_device_from_cdev(cdev
);
1904 return PTR_ERR(device
);
1905 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
1906 /* Already doing offline processing */
1907 dasd_put_device(device
);
1911 * We must make sure that this device is currently not in use.
1912 * The open_count is increased for every opener, that includes
1913 * the blkdev_get in dasd_scan_partitions. We are only interested
1914 * in the other openers.
1916 max_count
= device
->bdev
? 0 : -1;
1917 if (atomic_read(&device
->open_count
) > max_count
) {
1918 printk (KERN_WARNING
"Can't offline dasd device with open"
1920 atomic_read(&device
->open_count
));
1921 clear_bit(DASD_FLAG_OFFLINE
, &device
->flags
);
1922 dasd_put_device(device
);
1925 dasd_set_target_state(device
, DASD_STATE_NEW
);
1926 /* dasd_delete_device destroys the device reference. */
1927 dasd_delete_device(device
);
1933 dasd_generic_notify(struct ccw_device
*cdev
, int event
)
1935 struct dasd_device
*device
;
1936 struct dasd_ccw_req
*cqr
;
1937 unsigned long flags
;
1940 device
= dasd_device_from_cdev(cdev
);
1943 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
1948 if (device
->state
< DASD_STATE_BASIC
)
1950 /* Device is active. We want to keep it. */
1951 if (test_bit(DASD_FLAG_DSC_ERROR
, &device
->flags
)) {
1952 list_for_each_entry(cqr
, &device
->ccw_queue
, list
)
1953 if (cqr
->status
== DASD_CQR_IN_IO
)
1954 cqr
->status
= DASD_CQR_FAILED
;
1955 device
->stopped
|= DASD_STOPPED_DC_EIO
;
1957 list_for_each_entry(cqr
, &device
->ccw_queue
, list
)
1958 if (cqr
->status
== DASD_CQR_IN_IO
) {
1959 cqr
->status
= DASD_CQR_QUEUED
;
1962 device
->stopped
|= DASD_STOPPED_DC_WAIT
;
1963 dasd_set_timer(device
, 0);
1965 dasd_schedule_bh(device
);
1969 /* FIXME: add a sanity check. */
1970 device
->stopped
&= ~(DASD_STOPPED_DC_WAIT
|DASD_STOPPED_DC_EIO
);
1971 dasd_schedule_bh(device
);
1975 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
1976 dasd_put_device(device
);
1981 * Automatically online either all dasd devices (dasd_autodetect) or
1982 * all devices specified with dasd= parameters.
1985 __dasd_auto_online(struct device
*dev
, void *data
)
1987 struct ccw_device
*cdev
;
1989 cdev
= to_ccwdev(dev
);
1990 if (dasd_autodetect
|| dasd_busid_known(cdev
->dev
.bus_id
) == 0)
1991 ccw_device_set_online(cdev
);
1996 dasd_generic_auto_online (struct ccw_driver
*dasd_discipline_driver
)
1998 struct device_driver
*drv
;
2000 drv
= get_driver(&dasd_discipline_driver
->driver
);
2001 driver_for_each_device(drv
, NULL
, NULL
, __dasd_auto_online
);
2010 init_waitqueue_head(&dasd_init_waitq
);
2012 /* register 'common' DASD debug area, used for all DBF_XXX calls */
2013 dasd_debug_area
= debug_register("dasd", 1, 2, 8 * sizeof (long));
2014 if (dasd_debug_area
== NULL
) {
2018 debug_register_view(dasd_debug_area
, &debug_sprintf_view
);
2019 debug_set_level(dasd_debug_area
, DBF_EMERG
);
2021 DBF_EVENT(DBF_EMERG
, "%s", "debug area created");
2023 dasd_diag_discipline_pointer
= NULL
;
2025 rc
= devfs_mk_dir("dasd");
2028 rc
= dasd_devmap_init();
2031 rc
= dasd_gendisk_init();
2037 rc
= dasd_ioctl_init();
2040 #ifdef CONFIG_PROC_FS
2041 rc
= dasd_proc_init();
2048 MESSAGE(KERN_INFO
, "%s", "initialization not performed due to errors");
2053 module_init(dasd_init
);
2054 module_exit(dasd_exit
);
2056 EXPORT_SYMBOL(dasd_debug_area
);
2057 EXPORT_SYMBOL(dasd_diag_discipline_pointer
);
2059 EXPORT_SYMBOL(dasd_add_request_head
);
2060 EXPORT_SYMBOL(dasd_add_request_tail
);
2061 EXPORT_SYMBOL(dasd_cancel_req
);
2062 EXPORT_SYMBOL(dasd_clear_timer
);
2063 EXPORT_SYMBOL(dasd_enable_device
);
2064 EXPORT_SYMBOL(dasd_int_handler
);
2065 EXPORT_SYMBOL(dasd_kfree_request
);
2066 EXPORT_SYMBOL(dasd_kick_device
);
2067 EXPORT_SYMBOL(dasd_kmalloc_request
);
2068 EXPORT_SYMBOL(dasd_schedule_bh
);
2069 EXPORT_SYMBOL(dasd_set_target_state
);
2070 EXPORT_SYMBOL(dasd_set_timer
);
2071 EXPORT_SYMBOL(dasd_sfree_request
);
2072 EXPORT_SYMBOL(dasd_sleep_on
);
2073 EXPORT_SYMBOL(dasd_sleep_on_immediatly
);
2074 EXPORT_SYMBOL(dasd_sleep_on_interruptible
);
2075 EXPORT_SYMBOL(dasd_smalloc_request
);
2076 EXPORT_SYMBOL(dasd_start_IO
);
2077 EXPORT_SYMBOL(dasd_term_IO
);
2079 EXPORT_SYMBOL_GPL(dasd_generic_probe
);
2080 EXPORT_SYMBOL_GPL(dasd_generic_remove
);
2081 EXPORT_SYMBOL_GPL(dasd_generic_notify
);
2082 EXPORT_SYMBOL_GPL(dasd_generic_set_online
);
2083 EXPORT_SYMBOL_GPL(dasd_generic_set_offline
);
2084 EXPORT_SYMBOL_GPL(dasd_generic_auto_online
);
2087 * Overrides for Emacs so that we follow Linus's tabbing style.
2088 * Emacs will notice this stuff at the end of the file and automatically
2089 * adjust the settings for this buffer only. This must remain at the end
2091 * ---------------------------------------------------------------------------
2094 * c-brace-imaginary-offset: 0
2095 * c-brace-offset: -4
2096 * c-argdecl-indent: 4
2097 * c-label-offset: -4
2098 * c-continued-statement-offset: 4
2099 * c-continued-brace-offset: 0
2100 * indent-tabs-mode: 1