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>
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
)
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
, 0, 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
) {
542 if (cqr
->cpaddr
!= NULL
)
545 return ERR_PTR(-ENOMEM
);
547 memset(cqr
->data
, 0, datasize
);
549 strncpy((char *) &cqr
->magic
, magic
, 4);
550 ASCEBC((char *) &cqr
->magic
, 4);
551 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
552 dasd_get_device(device
);
556 struct dasd_ccw_req
*
557 dasd_smalloc_request(char *magic
, int cplength
, int datasize
,
558 struct dasd_device
* device
)
561 struct dasd_ccw_req
*cqr
;
566 if ( magic
== NULL
|| datasize
> PAGE_SIZE
||
567 (cplength
*sizeof(struct ccw1
)) > PAGE_SIZE
)
570 size
= (sizeof(struct dasd_ccw_req
) + 7L) & -8L;
572 size
+= cplength
* sizeof(struct ccw1
);
575 spin_lock_irqsave(&device
->mem_lock
, flags
);
576 cqr
= (struct dasd_ccw_req
*)
577 dasd_alloc_chunk(&device
->ccw_chunks
, size
);
578 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
580 return ERR_PTR(-ENOMEM
);
581 memset(cqr
, 0, sizeof(struct dasd_ccw_req
));
582 data
= (char *) cqr
+ ((sizeof(struct dasd_ccw_req
) + 7L) & -8L);
585 cqr
->cpaddr
= (struct ccw1
*) data
;
586 data
+= cplength
*sizeof(struct ccw1
);
587 memset(cqr
->cpaddr
, 0, cplength
*sizeof(struct ccw1
));
592 memset(cqr
->data
, 0, datasize
);
594 strncpy((char *) &cqr
->magic
, magic
, 4);
595 ASCEBC((char *) &cqr
->magic
, 4);
596 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
597 dasd_get_device(device
);
602 * Free memory of a channel program. This function needs to free all the
603 * idal lists that might have been created by dasd_set_cda and the
604 * struct dasd_ccw_req itself.
607 dasd_kfree_request(struct dasd_ccw_req
* cqr
, struct dasd_device
* device
)
609 #ifdef CONFIG_ARCH_S390X
612 /* Clear any idals used for the request. */
615 clear_normalized_cda(ccw
);
616 } while (ccw
++->flags
& (CCW_FLAG_CC
| CCW_FLAG_DC
));
618 if (cqr
->cpaddr
!= NULL
)
620 if (cqr
->data
!= NULL
)
623 dasd_put_device(device
);
627 dasd_sfree_request(struct dasd_ccw_req
* cqr
, struct dasd_device
* device
)
631 spin_lock_irqsave(&device
->mem_lock
, flags
);
632 dasd_free_chunk(&device
->ccw_chunks
, cqr
);
633 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
634 dasd_put_device(device
);
638 * Check discipline magic in cqr.
641 dasd_check_cqr(struct dasd_ccw_req
*cqr
)
643 struct dasd_device
*device
;
647 device
= cqr
->device
;
648 if (strncmp((char *) &cqr
->magic
, device
->discipline
->ebcname
, 4)) {
649 DEV_MESSAGE(KERN_WARNING
, device
,
650 " dasd_ccw_req 0x%08x magic doesn't match"
651 " discipline 0x%08x",
653 *(unsigned int *) device
->discipline
->name
);
660 * Terminate the current i/o and set the request to clear_pending.
661 * Timer keeps device runnig.
662 * ccw_device_clear can fail if the i/o subsystem
666 dasd_term_IO(struct dasd_ccw_req
* cqr
)
668 struct dasd_device
*device
;
672 rc
= dasd_check_cqr(cqr
);
676 device
= (struct dasd_device
*) cqr
->device
;
677 while ((retries
< 5) && (cqr
->status
== DASD_CQR_IN_IO
)) {
678 rc
= ccw_device_clear(device
->cdev
, (long) cqr
);
680 case 0: /* termination successful */
681 if (cqr
->retries
> 0) {
683 cqr
->status
= DASD_CQR_CLEAR
;
685 cqr
->status
= DASD_CQR_FAILED
;
686 cqr
->stopclk
= get_clock();
687 DBF_DEV_EVENT(DBF_DEBUG
, device
,
688 "terminate cqr %p successful",
692 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
693 "device gone, retry");
696 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
701 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
702 "device busy, retry later");
705 DEV_MESSAGE(KERN_ERR
, device
,
706 "line %d unknown RC=%d, please "
707 "report to linux390@de.ibm.com",
714 dasd_schedule_bh(device
);
719 * Start the i/o. This start_IO can fail if the channel is really busy.
720 * In that case set up a timer to start the request later.
723 dasd_start_IO(struct dasd_ccw_req
* cqr
)
725 struct dasd_device
*device
;
729 rc
= dasd_check_cqr(cqr
);
732 device
= (struct dasd_device
*) cqr
->device
;
733 if (cqr
->retries
< 0) {
734 DEV_MESSAGE(KERN_DEBUG
, device
,
735 "start_IO: request %p (%02x/%i) - no retry left.",
736 cqr
, cqr
->status
, cqr
->retries
);
737 cqr
->status
= DASD_CQR_FAILED
;
740 cqr
->startclk
= get_clock();
741 cqr
->starttime
= jiffies
;
743 rc
= ccw_device_start(device
->cdev
, cqr
->cpaddr
, (long) cqr
,
747 cqr
->status
= DASD_CQR_IN_IO
;
748 DBF_DEV_EVENT(DBF_DEBUG
, device
,
749 "start_IO: request %p started successful",
753 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
754 "start_IO: device busy, retry later");
757 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
758 "start_IO: request timeout, retry later");
761 /* -EACCES indicates that the request used only a
762 * subset of the available pathes and all these
764 * Do a retry with all available pathes.
766 cqr
->lpm
= LPM_ANYPATH
;
767 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
768 "start_IO: selected pathes gone,"
769 " retry on all pathes");
773 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
774 "start_IO: device gone, retry");
777 DEV_MESSAGE(KERN_ERR
, device
,
778 "line %d unknown RC=%d, please report"
779 " to linux390@de.ibm.com", __LINE__
, rc
);
787 * Timeout function for dasd devices. This is used for different purposes
788 * 1) missing interrupt handler for normal operation
789 * 2) delayed start of request where start_IO failed with -EBUSY
790 * 3) timeout for missing state change interrupts
791 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
792 * DASD_CQR_QUEUED for 2) and 3).
795 dasd_timeout_device(unsigned long ptr
)
798 struct dasd_device
*device
;
800 device
= (struct dasd_device
*) ptr
;
801 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
802 /* re-activate request queue */
803 device
->stopped
&= ~DASD_STOPPED_PENDING
;
804 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
805 dasd_schedule_bh(device
);
809 * Setup timeout for a device in jiffies.
812 dasd_set_timer(struct dasd_device
*device
, int expires
)
815 if (timer_pending(&device
->timer
))
816 del_timer(&device
->timer
);
819 if (timer_pending(&device
->timer
)) {
820 if (mod_timer(&device
->timer
, jiffies
+ expires
))
823 device
->timer
.function
= dasd_timeout_device
;
824 device
->timer
.data
= (unsigned long) device
;
825 device
->timer
.expires
= jiffies
+ expires
;
826 add_timer(&device
->timer
);
830 * Clear timeout for a device.
833 dasd_clear_timer(struct dasd_device
*device
)
835 if (timer_pending(&device
->timer
))
836 del_timer(&device
->timer
);
840 dasd_handle_killed_request(struct ccw_device
*cdev
, unsigned long intparm
)
842 struct dasd_ccw_req
*cqr
;
843 struct dasd_device
*device
;
845 cqr
= (struct dasd_ccw_req
*) intparm
;
846 if (cqr
->status
!= DASD_CQR_IN_IO
) {
848 "invalid status in handle_killed_request: "
849 "bus_id %s, status %02x",
850 cdev
->dev
.bus_id
, cqr
->status
);
854 device
= (struct dasd_device
*) cqr
->device
;
855 if (device
== NULL
||
856 device
!= dasd_device_from_cdev(cdev
) ||
857 strncmp(device
->discipline
->ebcname
, (char *) &cqr
->magic
, 4)) {
858 MESSAGE(KERN_DEBUG
, "invalid device in request: bus_id %s",
863 /* Schedule request to be retried. */
864 cqr
->status
= DASD_CQR_QUEUED
;
866 dasd_clear_timer(device
);
867 dasd_schedule_bh(device
);
868 dasd_put_device(device
);
872 dasd_handle_state_change_pending(struct dasd_device
*device
)
874 struct dasd_ccw_req
*cqr
;
875 struct list_head
*l
, *n
;
877 device
->stopped
&= ~DASD_STOPPED_PENDING
;
879 /* restart all 'running' IO on queue */
880 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
881 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
882 if (cqr
->status
== DASD_CQR_IN_IO
) {
883 cqr
->status
= DASD_CQR_QUEUED
;
886 dasd_clear_timer(device
);
887 dasd_schedule_bh(device
);
891 * Interrupt handler for "normal" ssch-io based dasd devices.
894 dasd_int_handler(struct ccw_device
*cdev
, unsigned long intparm
,
897 struct dasd_ccw_req
*cqr
, *next
;
898 struct dasd_device
*device
;
899 unsigned long long now
;
905 switch (PTR_ERR(irb
)) {
907 dasd_handle_killed_request(cdev
, intparm
);
910 printk(KERN_WARNING
"%s(%s): request timed out\n",
911 __FUNCTION__
, cdev
->dev
.bus_id
);
912 //FIXME - dasd uses own timeout interface...
915 printk(KERN_WARNING
"%s(%s): unknown error %ld\n",
916 __FUNCTION__
, cdev
->dev
.bus_id
, PTR_ERR(irb
));
923 DBF_EVENT(DBF_ERR
, "Interrupt: bus_id %s CS/DS %04x ip %08x",
924 cdev
->dev
.bus_id
, ((irb
->scsw
.cstat
<<8)|irb
->scsw
.dstat
),
925 (unsigned int) intparm
);
927 /* first of all check for state change pending interrupt */
928 mask
= DEV_STAT_ATTENTION
| DEV_STAT_DEV_END
| DEV_STAT_UNIT_EXCEP
;
929 if ((irb
->scsw
.dstat
& mask
) == mask
) {
930 device
= dasd_device_from_cdev(cdev
);
931 if (!IS_ERR(device
)) {
932 dasd_handle_state_change_pending(device
);
933 dasd_put_device(device
);
938 cqr
= (struct dasd_ccw_req
*) intparm
;
940 /* check for unsolicited interrupts */
943 "unsolicited interrupt received: bus_id %s",
948 device
= (struct dasd_device
*) cqr
->device
;
949 if (device
== NULL
||
950 strncmp(device
->discipline
->ebcname
, (char *) &cqr
->magic
, 4)) {
951 MESSAGE(KERN_DEBUG
, "invalid device in request: bus_id %s",
956 /* Check for clear pending */
957 if (cqr
->status
== DASD_CQR_CLEAR
&&
958 irb
->scsw
.fctl
& SCSW_FCTL_CLEAR_FUNC
) {
959 cqr
->status
= DASD_CQR_QUEUED
;
960 dasd_clear_timer(device
);
961 dasd_schedule_bh(device
);
965 /* check status - the request might have been killed by dyn detach */
966 if (cqr
->status
!= DASD_CQR_IN_IO
) {
968 "invalid status: bus_id %s, status %02x",
969 cdev
->dev
.bus_id
, cqr
->status
);
972 DBF_DEV_EVENT(DBF_DEBUG
, device
, "Int: CS/DS 0x%04x for cqr %p",
973 ((irb
->scsw
.cstat
<< 8) | irb
->scsw
.dstat
), cqr
);
975 /* Find out the appropriate era_action. */
976 if (irb
->scsw
.fctl
& SCSW_FCTL_HALT_FUNC
)
977 era
= dasd_era_fatal
;
978 else if (irb
->scsw
.dstat
== (DEV_STAT_CHN_END
| DEV_STAT_DEV_END
) &&
979 irb
->scsw
.cstat
== 0 &&
980 !irb
->esw
.esw0
.erw
.cons
)
982 else if (!test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
))
983 era
= dasd_era_fatal
; /* don't recover this request */
984 else if (irb
->esw
.esw0
.erw
.cons
)
985 era
= device
->discipline
->examine_error(cqr
, irb
);
987 era
= dasd_era_recover
;
989 DBF_DEV_EVENT(DBF_DEBUG
, device
, "era_code %d", era
);
991 if (era
== dasd_era_none
) {
992 cqr
->status
= DASD_CQR_DONE
;
994 /* Start first request on queue if possible -> fast_io. */
995 if (cqr
->list
.next
!= &device
->ccw_queue
) {
996 next
= list_entry(cqr
->list
.next
,
997 struct dasd_ccw_req
, list
);
998 if ((next
->status
== DASD_CQR_QUEUED
) &&
999 (!device
->stopped
)) {
1000 if (device
->discipline
->start_IO(next
) == 0)
1001 expires
= next
->expires
;
1003 DEV_MESSAGE(KERN_DEBUG
, device
, "%s",
1004 "Interrupt fastpath "
1008 } else { /* error */
1009 memcpy(&cqr
->irb
, irb
, sizeof (struct irb
));
1011 /* dump sense data */
1012 dasd_log_sense(cqr
, irb
);
1015 case dasd_era_fatal
:
1016 cqr
->status
= DASD_CQR_FAILED
;
1019 case dasd_era_recover
:
1020 cqr
->status
= DASD_CQR_ERROR
;
1027 dasd_set_timer(device
, expires
);
1029 dasd_clear_timer(device
);
1030 dasd_schedule_bh(device
);
1034 * posts the buffer_cache about a finalized request
1037 dasd_end_request(struct request
*req
, int uptodate
)
1039 if (end_that_request_first(req
, uptodate
, req
->hard_nr_sectors
))
1041 add_disk_randomness(req
->rq_disk
);
1042 end_that_request_last(req
);
1046 * Process finished error recovery ccw.
1049 __dasd_process_erp(struct dasd_device
*device
, struct dasd_ccw_req
*cqr
)
1051 dasd_erp_fn_t erp_fn
;
1053 if (cqr
->status
== DASD_CQR_DONE
)
1054 DBF_DEV_EVENT(DBF_NOTICE
, device
, "%s", "ERP successful");
1056 DEV_MESSAGE(KERN_ERR
, device
, "%s", "ERP unsuccessful");
1057 erp_fn
= device
->discipline
->erp_postaction(cqr
);
1062 * Process ccw request queue.
1065 __dasd_process_ccw_queue(struct dasd_device
* device
,
1066 struct list_head
*final_queue
)
1068 struct list_head
*l
, *n
;
1069 struct dasd_ccw_req
*cqr
;
1070 dasd_erp_fn_t erp_fn
;
1073 /* Process request with final status. */
1074 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1075 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
1076 /* Stop list processing at the first non-final request. */
1077 if (cqr
->status
!= DASD_CQR_DONE
&&
1078 cqr
->status
!= DASD_CQR_FAILED
&&
1079 cqr
->status
!= DASD_CQR_ERROR
)
1081 /* Process requests with DASD_CQR_ERROR */
1082 if (cqr
->status
== DASD_CQR_ERROR
) {
1083 if (cqr
->irb
.scsw
.fctl
& SCSW_FCTL_HALT_FUNC
) {
1084 cqr
->status
= DASD_CQR_FAILED
;
1085 cqr
->stopclk
= get_clock();
1087 if (cqr
->irb
.esw
.esw0
.erw
.cons
) {
1088 erp_fn
= device
->discipline
->
1092 dasd_default_erp_action(cqr
);
1096 /* Process finished ERP request. */
1098 __dasd_process_erp(device
, cqr
);
1102 /* Rechain finished requests to final queue */
1103 cqr
->endclk
= get_clock();
1104 list_move_tail(&cqr
->list
, final_queue
);
1109 dasd_end_request_cb(struct dasd_ccw_req
* cqr
, void *data
)
1111 struct request
*req
;
1112 struct dasd_device
*device
;
1115 req
= (struct request
*) data
;
1116 device
= cqr
->device
;
1117 dasd_profile_end(device
, cqr
, req
);
1118 status
= cqr
->device
->discipline
->free_cp(cqr
,req
);
1119 spin_lock_irq(&device
->request_queue_lock
);
1120 dasd_end_request(req
, status
);
1121 spin_unlock_irq(&device
->request_queue_lock
);
1126 * Fetch requests from the block device queue.
1129 __dasd_process_blk_queue(struct dasd_device
* device
)
1131 request_queue_t
*queue
;
1132 struct request
*req
;
1133 struct dasd_ccw_req
*cqr
;
1136 queue
= device
->request_queue
;
1137 /* No queue ? Then there is nothing to do. */
1142 * We requeue request from the block device queue to the ccw
1143 * queue only in two states. In state DASD_STATE_READY the
1144 * partition detection is done and we need to requeue requests
1145 * for that. State DASD_STATE_ONLINE is normal block device
1148 if (device
->state
!= DASD_STATE_READY
&&
1149 device
->state
!= DASD_STATE_ONLINE
)
1152 /* Now we try to fetch requests from the request queue */
1153 list_for_each_entry(cqr
, &device
->ccw_queue
, list
)
1154 if (cqr
->status
== DASD_CQR_QUEUED
)
1156 while (!blk_queue_plugged(queue
) &&
1157 elv_next_request(queue
) &&
1158 nr_queued
< DASD_CHANQ_MAX_SIZE
) {
1159 req
= elv_next_request(queue
);
1160 if (test_bit(DASD_FLAG_RO
, &device
->flags
) &&
1161 rq_data_dir(req
) == WRITE
) {
1162 DBF_DEV_EVENT(DBF_ERR
, device
,
1163 "Rejecting write request %p",
1165 blkdev_dequeue_request(req
);
1166 dasd_end_request(req
, 0);
1169 if (device
->stopped
& DASD_STOPPED_DC_EIO
) {
1170 blkdev_dequeue_request(req
);
1171 dasd_end_request(req
, 0);
1174 cqr
= device
->discipline
->build_cp(device
, req
);
1176 if (PTR_ERR(cqr
) == -ENOMEM
)
1177 break; /* terminate request queue loop */
1178 DBF_DEV_EVENT(DBF_ERR
, device
,
1179 "CCW creation failed (rc=%ld) "
1182 blkdev_dequeue_request(req
);
1183 dasd_end_request(req
, 0);
1186 cqr
->callback
= dasd_end_request_cb
;
1187 cqr
->callback_data
= (void *) req
;
1188 cqr
->status
= DASD_CQR_QUEUED
;
1189 blkdev_dequeue_request(req
);
1190 list_add_tail(&cqr
->list
, &device
->ccw_queue
);
1191 dasd_profile_start(device
, cqr
, req
);
1197 * Take a look at the first request on the ccw queue and check
1198 * if it reached its expire time. If so, terminate the IO.
1201 __dasd_check_expire(struct dasd_device
* device
)
1203 struct dasd_ccw_req
*cqr
;
1205 if (list_empty(&device
->ccw_queue
))
1207 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, list
);
1208 if (cqr
->status
== DASD_CQR_IN_IO
&& cqr
->expires
!= 0) {
1209 if (time_after_eq(jiffies
, cqr
->expires
+ cqr
->starttime
)) {
1210 if (device
->discipline
->term_IO(cqr
) != 0)
1211 /* Hmpf, try again in 1/10 sec */
1212 dasd_set_timer(device
, 10);
1218 * Take a look at the first request on the ccw queue and check
1219 * if it needs to be started.
1222 __dasd_start_head(struct dasd_device
* device
)
1224 struct dasd_ccw_req
*cqr
;
1227 if (list_empty(&device
->ccw_queue
))
1229 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, list
);
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(&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_compare_and_swap (0, 1, &device
->tasklet_scheduled
))
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
|| cqr
->status
== DASD_CQR_FAILED
;
1393 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1398 * Attempts to start a special ccw queue and waits for its completion.
1401 dasd_sleep_on(struct dasd_ccw_req
* cqr
)
1403 wait_queue_head_t wait_q
;
1404 struct dasd_device
*device
;
1407 device
= cqr
->device
;
1408 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1410 init_waitqueue_head (&wait_q
);
1411 cqr
->callback
= dasd_wakeup_cb
;
1412 cqr
->callback_data
= (void *) &wait_q
;
1413 cqr
->status
= DASD_CQR_QUEUED
;
1414 list_add_tail(&cqr
->list
, &device
->ccw_queue
);
1416 /* let the bh start the request to keep them in order */
1417 dasd_schedule_bh(device
);
1419 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1421 wait_event(wait_q
, _wait_for_wakeup(cqr
));
1423 /* Request status is either done or failed. */
1424 rc
= (cqr
->status
== DASD_CQR_FAILED
) ? -EIO
: 0;
1429 * Attempts to start a special ccw queue and wait interruptible
1430 * for its completion.
1433 dasd_sleep_on_interruptible(struct dasd_ccw_req
* cqr
)
1435 wait_queue_head_t wait_q
;
1436 struct dasd_device
*device
;
1439 device
= cqr
->device
;
1440 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1442 init_waitqueue_head (&wait_q
);
1443 cqr
->callback
= dasd_wakeup_cb
;
1444 cqr
->callback_data
= (void *) &wait_q
;
1445 cqr
->status
= DASD_CQR_QUEUED
;
1446 list_add_tail(&cqr
->list
, &device
->ccw_queue
);
1448 /* let the bh start the request to keep them in order */
1449 dasd_schedule_bh(device
);
1450 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1454 rc
= wait_event_interruptible(wait_q
, _wait_for_wakeup(cqr
));
1455 if (rc
!= -ERESTARTSYS
) {
1456 /* Request status is either done or failed. */
1457 rc
= (cqr
->status
== DASD_CQR_FAILED
) ? -EIO
: 0;
1460 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1461 if (cqr
->status
== DASD_CQR_IN_IO
&&
1462 device
->discipline
->term_IO(cqr
) == 0) {
1463 list_del(&cqr
->list
);
1466 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1472 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
1473 * for eckd devices) the currently running request has to be terminated
1474 * and be put back to status queued, before the special request is added
1475 * to the head of the queue. Then the special request is waited on normally.
1478 _dasd_term_running_cqr(struct dasd_device
*device
)
1480 struct dasd_ccw_req
*cqr
;
1483 if (list_empty(&device
->ccw_queue
))
1485 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, list
);
1486 rc
= device
->discipline
->term_IO(cqr
);
1488 /* termination successful */
1489 cqr
->status
= DASD_CQR_QUEUED
;
1490 cqr
->startclk
= cqr
->stopclk
= 0;
1497 dasd_sleep_on_immediatly(struct dasd_ccw_req
* cqr
)
1499 wait_queue_head_t wait_q
;
1500 struct dasd_device
*device
;
1503 device
= cqr
->device
;
1504 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1505 rc
= _dasd_term_running_cqr(device
);
1507 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1511 init_waitqueue_head (&wait_q
);
1512 cqr
->callback
= dasd_wakeup_cb
;
1513 cqr
->callback_data
= (void *) &wait_q
;
1514 cqr
->status
= DASD_CQR_QUEUED
;
1515 list_add(&cqr
->list
, &device
->ccw_queue
);
1517 /* let the bh start the request to keep them in order */
1518 dasd_schedule_bh(device
);
1520 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1522 wait_event(wait_q
, _wait_for_wakeup(cqr
));
1524 /* Request status is either done or failed. */
1525 rc
= (cqr
->status
== DASD_CQR_FAILED
) ? -EIO
: 0;
1530 * Cancels a request that was started with dasd_sleep_on_req.
1531 * This is useful to timeout requests. The request will be
1532 * terminated if it is currently in i/o.
1533 * Returns 1 if the request has been terminated.
1536 dasd_cancel_req(struct dasd_ccw_req
*cqr
)
1538 struct dasd_device
*device
= cqr
->device
;
1539 unsigned long flags
;
1543 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1544 switch (cqr
->status
) {
1545 case DASD_CQR_QUEUED
:
1546 /* request was not started - just set to failed */
1547 cqr
->status
= DASD_CQR_FAILED
;
1549 case DASD_CQR_IN_IO
:
1550 /* request in IO - terminate IO and release again */
1551 if (device
->discipline
->term_IO(cqr
) != 0)
1552 /* what to do if unable to terminate ??????
1554 cqr
->status
= DASD_CQR_FAILED
;
1555 cqr
->stopclk
= get_clock();
1559 case DASD_CQR_FAILED
:
1560 /* already finished - do nothing */
1563 DEV_MESSAGE(KERN_ALERT
, device
,
1564 "invalid status %02x in request",
1569 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1570 dasd_schedule_bh(device
);
1575 * SECTION: Block device operations (request queue, partitions, open, release).
1579 * Dasd request queue function. Called from ll_rw_blk.c
1582 do_dasd_request(request_queue_t
* queue
)
1584 struct dasd_device
*device
;
1586 device
= (struct dasd_device
*) queue
->queuedata
;
1587 spin_lock(get_ccwdev_lock(device
->cdev
));
1588 /* Get new request from the block device request queue */
1589 __dasd_process_blk_queue(device
);
1590 /* Now check if the head of the ccw queue needs to be started. */
1591 __dasd_start_head(device
);
1592 spin_unlock(get_ccwdev_lock(device
->cdev
));
1596 * Allocate and initialize request queue and default I/O scheduler.
1599 dasd_alloc_queue(struct dasd_device
* device
)
1603 device
->request_queue
= blk_init_queue(do_dasd_request
,
1604 &device
->request_queue_lock
);
1605 if (device
->request_queue
== NULL
)
1608 device
->request_queue
->queuedata
= device
;
1610 elevator_exit(device
->request_queue
->elevator
);
1611 rc
= elevator_init(device
->request_queue
, "deadline");
1613 blk_cleanup_queue(device
->request_queue
);
1620 * Allocate and initialize request queue.
1623 dasd_setup_queue(struct dasd_device
* device
)
1627 blk_queue_hardsect_size(device
->request_queue
, device
->bp_block
);
1628 max
= device
->discipline
->max_blocks
<< device
->s2b_shift
;
1629 blk_queue_max_sectors(device
->request_queue
, max
);
1630 blk_queue_max_phys_segments(device
->request_queue
, -1L);
1631 blk_queue_max_hw_segments(device
->request_queue
, -1L);
1632 blk_queue_max_segment_size(device
->request_queue
, -1L);
1633 blk_queue_segment_boundary(device
->request_queue
, -1L);
1637 * Deactivate and free request queue.
1640 dasd_free_queue(struct dasd_device
* device
)
1642 if (device
->request_queue
) {
1643 blk_cleanup_queue(device
->request_queue
);
1644 device
->request_queue
= NULL
;
1649 * Flush request on the request queue.
1652 dasd_flush_request_queue(struct dasd_device
* device
)
1654 struct request
*req
;
1656 if (!device
->request_queue
)
1659 spin_lock_irq(&device
->request_queue_lock
);
1660 while (!list_empty(&device
->request_queue
->queue_head
)) {
1661 req
= elv_next_request(device
->request_queue
);
1664 dasd_end_request(req
, 0);
1665 blkdev_dequeue_request(req
);
1667 spin_unlock_irq(&device
->request_queue_lock
);
1671 dasd_open(struct inode
*inp
, struct file
*filp
)
1673 struct gendisk
*disk
= inp
->i_bdev
->bd_disk
;
1674 struct dasd_device
*device
= disk
->private_data
;
1677 atomic_inc(&device
->open_count
);
1678 if (test_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
1683 if (!try_module_get(device
->discipline
->owner
)) {
1688 if (dasd_probeonly
) {
1689 DEV_MESSAGE(KERN_INFO
, device
, "%s",
1690 "No access to device due to probeonly mode");
1695 if (device
->state
< DASD_STATE_BASIC
) {
1696 DBF_DEV_EVENT(DBF_ERR
, device
, " %s",
1697 " Cannot open unrecognized device");
1705 module_put(device
->discipline
->owner
);
1707 atomic_dec(&device
->open_count
);
1712 dasd_release(struct inode
*inp
, struct file
*filp
)
1714 struct gendisk
*disk
= inp
->i_bdev
->bd_disk
;
1715 struct dasd_device
*device
= disk
->private_data
;
1717 atomic_dec(&device
->open_count
);
1718 module_put(device
->discipline
->owner
);
1722 struct block_device_operations
1723 dasd_device_operations
= {
1724 .owner
= THIS_MODULE
,
1726 .release
= dasd_release
,
1727 .ioctl
= dasd_ioctl
,
1734 #ifdef CONFIG_PROC_FS
1738 dasd_gendisk_exit();
1740 devfs_remove("dasd");
1741 if (dasd_debug_area
!= NULL
) {
1742 debug_unregister(dasd_debug_area
);
1743 dasd_debug_area
= NULL
;
1748 * SECTION: common functions for ccw_driver use
1751 /* initial attempt at a probe function. this can be simplified once
1752 * the other detection code is gone */
1754 dasd_generic_probe (struct ccw_device
*cdev
,
1755 struct dasd_discipline
*discipline
)
1759 ret
= dasd_add_sysfs_files(cdev
);
1762 "dasd_generic_probe: could not add sysfs entries "
1763 "for %s\n", cdev
->dev
.bus_id
);
1766 cdev
->handler
= &dasd_int_handler
;
1771 /* this will one day be called from a global not_oper handler.
1772 * It is also used by driver_unregister during module unload */
1774 dasd_generic_remove (struct ccw_device
*cdev
)
1776 struct dasd_device
*device
;
1778 dasd_remove_sysfs_files(cdev
);
1779 device
= dasd_device_from_cdev(cdev
);
1782 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
1783 /* Already doing offline processing */
1784 dasd_put_device(device
);
1788 * This device is removed unconditionally. Set offline
1789 * flag to prevent dasd_open from opening it while it is
1790 * no quite down yet.
1792 dasd_set_target_state(device
, DASD_STATE_NEW
);
1793 /* dasd_delete_device destroys the device reference. */
1794 dasd_delete_device(device
);
1797 /* activate a device. This is called from dasd_{eckd,fba}_probe() when either
1798 * the device is detected for the first time and is supposed to be used
1799 * or the user has started activation through sysfs */
1801 dasd_generic_set_online (struct ccw_device
*cdev
,
1802 struct dasd_discipline
*discipline
)
1805 struct dasd_device
*device
;
1808 device
= dasd_create_device(cdev
);
1810 return PTR_ERR(device
);
1812 if (test_bit(DASD_FLAG_USE_DIAG
, &device
->flags
)) {
1813 if (!dasd_diag_discipline_pointer
) {
1814 printk (KERN_WARNING
1815 "dasd_generic couldn't online device %s "
1816 "- discipline DIAG not available\n",
1818 dasd_delete_device(device
);
1821 discipline
= dasd_diag_discipline_pointer
;
1823 device
->discipline
= discipline
;
1825 rc
= discipline
->check_device(device
);
1827 printk (KERN_WARNING
1828 "dasd_generic couldn't online device %s "
1829 "with discipline %s rc=%i\n",
1830 cdev
->dev
.bus_id
, discipline
->name
, rc
);
1831 dasd_delete_device(device
);
1835 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
1836 if (device
->state
<= DASD_STATE_KNOWN
) {
1837 printk (KERN_WARNING
1838 "dasd_generic discipline not found for %s\n",
1841 dasd_set_target_state(device
, DASD_STATE_NEW
);
1842 dasd_delete_device(device
);
1844 pr_debug("dasd_generic device %s found\n",
1847 /* FIXME: we have to wait for the root device but we don't want
1848 * to wait for each single device but for all at once. */
1849 wait_event(dasd_init_waitq
, _wait_for_device(device
));
1851 dasd_put_device(device
);
1857 dasd_generic_set_offline (struct ccw_device
*cdev
)
1859 struct dasd_device
*device
;
1862 device
= dasd_device_from_cdev(cdev
);
1864 return PTR_ERR(device
);
1865 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
1866 /* Already doing offline processing */
1867 dasd_put_device(device
);
1871 * We must make sure that this device is currently not in use.
1872 * The open_count is increased for every opener, that includes
1873 * the blkdev_get in dasd_scan_partitions. We are only interested
1874 * in the other openers.
1876 max_count
= device
->bdev
? 0 : -1;
1877 if (atomic_read(&device
->open_count
) > max_count
) {
1878 printk (KERN_WARNING
"Can't offline dasd device with open"
1880 atomic_read(&device
->open_count
));
1881 clear_bit(DASD_FLAG_OFFLINE
, &device
->flags
);
1882 dasd_put_device(device
);
1885 dasd_set_target_state(device
, DASD_STATE_NEW
);
1886 /* dasd_delete_device destroys the device reference. */
1887 dasd_delete_device(device
);
1893 dasd_generic_notify(struct ccw_device
*cdev
, int event
)
1895 struct dasd_device
*device
;
1896 struct dasd_ccw_req
*cqr
;
1897 unsigned long flags
;
1900 device
= dasd_device_from_cdev(cdev
);
1903 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
1908 if (device
->state
< DASD_STATE_BASIC
)
1910 /* Device is active. We want to keep it. */
1911 if (test_bit(DASD_FLAG_DSC_ERROR
, &device
->flags
)) {
1912 list_for_each_entry(cqr
, &device
->ccw_queue
, list
)
1913 if (cqr
->status
== DASD_CQR_IN_IO
)
1914 cqr
->status
= DASD_CQR_FAILED
;
1915 device
->stopped
|= DASD_STOPPED_DC_EIO
;
1916 dasd_schedule_bh(device
);
1918 list_for_each_entry(cqr
, &device
->ccw_queue
, list
)
1919 if (cqr
->status
== DASD_CQR_IN_IO
) {
1920 cqr
->status
= DASD_CQR_QUEUED
;
1923 device
->stopped
|= DASD_STOPPED_DC_WAIT
;
1924 dasd_set_timer(device
, 0);
1929 /* FIXME: add a sanity check. */
1930 device
->stopped
&= ~(DASD_STOPPED_DC_WAIT
|DASD_STOPPED_DC_EIO
);
1931 dasd_schedule_bh(device
);
1935 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
1936 dasd_put_device(device
);
1941 * Automatically online either all dasd devices (dasd_autodetect) or
1942 * all devices specified with dasd= parameters.
1945 dasd_generic_auto_online (struct ccw_driver
*dasd_discipline_driver
)
1947 struct device_driver
*drv
;
1948 struct device
*d
, *dev
;
1949 struct ccw_device
*cdev
;
1951 drv
= get_driver(&dasd_discipline_driver
->driver
);
1952 down_read(&drv
->bus
->subsys
.rwsem
);
1954 list_for_each_entry(d
, &drv
->devices
, driver_list
) {
1955 dev
= get_device(d
);
1958 cdev
= to_ccwdev(dev
);
1959 if (dasd_autodetect
|| dasd_busid_known(cdev
->dev
.bus_id
) == 0)
1960 ccw_device_set_online(cdev
);
1963 up_read(&drv
->bus
->subsys
.rwsem
);
1972 init_waitqueue_head(&dasd_init_waitq
);
1974 /* register 'common' DASD debug area, used for all DBF_XXX calls */
1975 dasd_debug_area
= debug_register("dasd", 0, 2, 8 * sizeof (long));
1976 if (dasd_debug_area
== NULL
) {
1980 debug_register_view(dasd_debug_area
, &debug_sprintf_view
);
1981 debug_set_level(dasd_debug_area
, DBF_EMERG
);
1983 DBF_EVENT(DBF_EMERG
, "%s", "debug area created");
1985 dasd_diag_discipline_pointer
= NULL
;
1987 rc
= devfs_mk_dir("dasd");
1990 rc
= dasd_devmap_init();
1993 rc
= dasd_gendisk_init();
1999 rc
= dasd_ioctl_init();
2002 #ifdef CONFIG_PROC_FS
2003 rc
= dasd_proc_init();
2010 MESSAGE(KERN_INFO
, "%s", "initialization not performed due to errors");
2015 module_init(dasd_init
);
2016 module_exit(dasd_exit
);
2018 EXPORT_SYMBOL(dasd_debug_area
);
2019 EXPORT_SYMBOL(dasd_diag_discipline_pointer
);
2021 EXPORT_SYMBOL(dasd_add_request_head
);
2022 EXPORT_SYMBOL(dasd_add_request_tail
);
2023 EXPORT_SYMBOL(dasd_cancel_req
);
2024 EXPORT_SYMBOL(dasd_clear_timer
);
2025 EXPORT_SYMBOL(dasd_enable_device
);
2026 EXPORT_SYMBOL(dasd_int_handler
);
2027 EXPORT_SYMBOL(dasd_kfree_request
);
2028 EXPORT_SYMBOL(dasd_kick_device
);
2029 EXPORT_SYMBOL(dasd_kmalloc_request
);
2030 EXPORT_SYMBOL(dasd_schedule_bh
);
2031 EXPORT_SYMBOL(dasd_set_target_state
);
2032 EXPORT_SYMBOL(dasd_set_timer
);
2033 EXPORT_SYMBOL(dasd_sfree_request
);
2034 EXPORT_SYMBOL(dasd_sleep_on
);
2035 EXPORT_SYMBOL(dasd_sleep_on_immediatly
);
2036 EXPORT_SYMBOL(dasd_sleep_on_interruptible
);
2037 EXPORT_SYMBOL(dasd_smalloc_request
);
2038 EXPORT_SYMBOL(dasd_start_IO
);
2039 EXPORT_SYMBOL(dasd_term_IO
);
2041 EXPORT_SYMBOL_GPL(dasd_generic_probe
);
2042 EXPORT_SYMBOL_GPL(dasd_generic_remove
);
2043 EXPORT_SYMBOL_GPL(dasd_generic_notify
);
2044 EXPORT_SYMBOL_GPL(dasd_generic_set_online
);
2045 EXPORT_SYMBOL_GPL(dasd_generic_set_offline
);
2046 EXPORT_SYMBOL_GPL(dasd_generic_auto_online
);
2049 * Overrides for Emacs so that we follow Linus's tabbing style.
2050 * Emacs will notice this stuff at the end of the file and automatically
2051 * adjust the settings for this buffer only. This must remain at the end
2053 * ---------------------------------------------------------------------------
2056 * c-brace-imaginary-offset: 0
2057 * c-brace-offset: -4
2058 * c-argdecl-indent: 4
2059 * c-label-offset: -4
2060 * c-continued-statement-offset: 4
2061 * c-continued-brace-offset: 0
2062 * indent-tabs-mode: 1