2 * File...........: linux/drivers/s390/block/dasd.c
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
12 #include <linux/config.h>
13 #include <linux/kmod.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/ctype.h>
17 #include <linux/major.h>
18 #include <linux/slab.h>
19 #include <linux/buffer_head.h>
20 #include <linux/hdreg.h>
22 #include <asm/ccwdev.h>
23 #include <asm/ebcdic.h>
24 #include <asm/idals.h>
25 #include <asm/todclk.h>
28 #define PRINTK_HEADER "dasd:"
32 * SECTION: Constant definitions to be used within this file
34 #define DASD_CHANQ_MAX_SIZE 4
37 * SECTION: exported variables of dasd.c
39 debug_info_t
*dasd_debug_area
;
40 struct dasd_discipline
*dasd_diag_discipline_pointer
;
42 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
43 MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
44 " Copyright 2000 IBM Corporation");
45 MODULE_SUPPORTED_DEVICE("dasd");
46 MODULE_LICENSE("GPL");
49 * SECTION: prototypes for static functions of dasd.c
51 static int dasd_alloc_queue(struct dasd_device
* device
);
52 static void dasd_setup_queue(struct dasd_device
* device
);
53 static void dasd_free_queue(struct dasd_device
* device
);
54 static void dasd_flush_request_queue(struct dasd_device
*);
55 static void dasd_int_handler(struct ccw_device
*, unsigned long, struct irb
*);
56 static void dasd_flush_ccw_queue(struct dasd_device
*, int);
57 static void dasd_tasklet(struct dasd_device
*);
58 static void do_kick_device(void *data
);
61 * SECTION: Operations on the device structure.
63 static wait_queue_head_t dasd_init_waitq
;
66 * Allocate memory for a new device structure.
69 dasd_alloc_device(void)
71 struct dasd_device
*device
;
73 device
= kzalloc(sizeof (struct dasd_device
), GFP_ATOMIC
);
75 return ERR_PTR(-ENOMEM
);
76 /* open_count = 0 means device online but not in use */
77 atomic_set(&device
->open_count
, -1);
79 /* Get two pages for normal block device operations. */
80 device
->ccw_mem
= (void *) __get_free_pages(GFP_ATOMIC
| GFP_DMA
, 1);
81 if (device
->ccw_mem
== NULL
) {
83 return ERR_PTR(-ENOMEM
);
85 /* Get one page for error recovery. */
86 device
->erp_mem
= (void *) get_zeroed_page(GFP_ATOMIC
| GFP_DMA
);
87 if (device
->erp_mem
== NULL
) {
88 free_pages((unsigned long) device
->ccw_mem
, 1);
90 return ERR_PTR(-ENOMEM
);
93 dasd_init_chunklist(&device
->ccw_chunks
, device
->ccw_mem
, PAGE_SIZE
*2);
94 dasd_init_chunklist(&device
->erp_chunks
, device
->erp_mem
, PAGE_SIZE
);
95 spin_lock_init(&device
->mem_lock
);
96 spin_lock_init(&device
->request_queue_lock
);
97 atomic_set (&device
->tasklet_scheduled
, 0);
98 tasklet_init(&device
->tasklet
,
99 (void (*)(unsigned long)) dasd_tasklet
,
100 (unsigned long) device
);
101 INIT_LIST_HEAD(&device
->ccw_queue
);
102 init_timer(&device
->timer
);
103 INIT_WORK(&device
->kick_work
, do_kick_device
, device
);
104 device
->state
= DASD_STATE_NEW
;
105 device
->target
= DASD_STATE_NEW
;
111 * Free memory of a device structure.
114 dasd_free_device(struct dasd_device
*device
)
116 kfree(device
->private);
117 free_page((unsigned long) device
->erp_mem
);
118 free_pages((unsigned long) device
->ccw_mem
, 1);
123 * Make a new device known to the system.
126 dasd_state_new_to_known(struct dasd_device
*device
)
131 * As long as the device is not in state DASD_STATE_NEW we want to
132 * keep the reference count > 0.
134 dasd_get_device(device
);
136 rc
= dasd_alloc_queue(device
);
138 dasd_put_device(device
);
142 device
->state
= DASD_STATE_KNOWN
;
147 * Let the system forget about a device.
150 dasd_state_known_to_new(struct dasd_device
* device
)
152 /* Disable extended error reporting for this device. */
153 dasd_eer_disable(device
);
154 /* Forget the discipline information. */
155 if (device
->discipline
)
156 module_put(device
->discipline
->owner
);
157 device
->discipline
= NULL
;
158 if (device
->base_discipline
)
159 module_put(device
->base_discipline
->owner
);
160 device
->base_discipline
= NULL
;
161 device
->state
= DASD_STATE_NEW
;
163 dasd_free_queue(device
);
165 /* Give up reference we took in dasd_state_new_to_known. */
166 dasd_put_device(device
);
170 * Request the irq line for the device.
173 dasd_state_known_to_basic(struct dasd_device
* device
)
177 /* Allocate and register gendisk structure. */
178 rc
= dasd_gendisk_alloc(device
);
182 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
183 device
->debug_area
= debug_register(device
->cdev
->dev
.bus_id
, 1, 2,
185 debug_register_view(device
->debug_area
, &debug_sprintf_view
);
186 debug_set_level(device
->debug_area
, DBF_EMERG
);
187 DBF_DEV_EVENT(DBF_EMERG
, device
, "%s", "debug area created");
189 device
->state
= DASD_STATE_BASIC
;
194 * Release the irq line for the device. Terminate any running i/o.
197 dasd_state_basic_to_known(struct dasd_device
* device
)
199 dasd_gendisk_free(device
);
200 dasd_flush_ccw_queue(device
, 1);
201 DBF_DEV_EVENT(DBF_EMERG
, device
, "%p debug area deleted", device
);
202 if (device
->debug_area
!= NULL
) {
203 debug_unregister(device
->debug_area
);
204 device
->debug_area
= NULL
;
206 device
->state
= DASD_STATE_KNOWN
;
210 * Do the initial analysis. The do_analysis function may return
211 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
212 * until the discipline decides to continue the startup sequence
213 * by calling the function dasd_change_state. The eckd disciplines
214 * uses this to start a ccw that detects the format. The completion
215 * interrupt for this detection ccw uses the kernel event daemon to
216 * trigger the call to dasd_change_state. All this is done in the
217 * discipline code, see dasd_eckd.c.
218 * After the analysis ccw is done (do_analysis returned 0) the block
220 * In case the analysis returns an error, the device setup is stopped
221 * (a fake disk was already added to allow formatting).
224 dasd_state_basic_to_ready(struct dasd_device
* device
)
229 if (device
->discipline
->do_analysis
!= NULL
)
230 rc
= device
->discipline
->do_analysis(device
);
233 device
->state
= DASD_STATE_UNFMT
;
236 /* make disk known with correct capacity */
237 dasd_setup_queue(device
);
238 set_capacity(device
->gdp
, device
->blocks
<< device
->s2b_shift
);
239 device
->state
= DASD_STATE_READY
;
240 rc
= dasd_scan_partitions(device
);
242 device
->state
= DASD_STATE_BASIC
;
247 * Remove device from block device layer. Destroy dirty buffers.
248 * Forget format information. Check if the target level is basic
249 * and if it is create fake disk for formatting.
252 dasd_state_ready_to_basic(struct dasd_device
* device
)
254 dasd_flush_ccw_queue(device
, 0);
255 dasd_destroy_partitions(device
);
256 dasd_flush_request_queue(device
);
258 device
->bp_block
= 0;
259 device
->s2b_shift
= 0;
260 device
->state
= DASD_STATE_BASIC
;
267 dasd_state_unfmt_to_basic(struct dasd_device
* device
)
269 device
->state
= DASD_STATE_BASIC
;
273 * Make the device online and schedule the bottom half to start
274 * the requeueing of requests from the linux request queue to the
278 dasd_state_ready_to_online(struct dasd_device
* device
)
280 device
->state
= DASD_STATE_ONLINE
;
281 dasd_schedule_bh(device
);
286 * Stop the requeueing of requests again.
289 dasd_state_online_to_ready(struct dasd_device
* device
)
291 device
->state
= DASD_STATE_READY
;
295 * Device startup state changes.
298 dasd_increase_state(struct dasd_device
*device
)
303 if (device
->state
== DASD_STATE_NEW
&&
304 device
->target
>= DASD_STATE_KNOWN
)
305 rc
= dasd_state_new_to_known(device
);
308 device
->state
== DASD_STATE_KNOWN
&&
309 device
->target
>= DASD_STATE_BASIC
)
310 rc
= dasd_state_known_to_basic(device
);
313 device
->state
== DASD_STATE_BASIC
&&
314 device
->target
>= DASD_STATE_READY
)
315 rc
= dasd_state_basic_to_ready(device
);
318 device
->state
== DASD_STATE_READY
&&
319 device
->target
>= DASD_STATE_ONLINE
)
320 rc
= dasd_state_ready_to_online(device
);
326 * Device shutdown state changes.
329 dasd_decrease_state(struct dasd_device
*device
)
331 if (device
->state
== DASD_STATE_ONLINE
&&
332 device
->target
<= DASD_STATE_READY
)
333 dasd_state_online_to_ready(device
);
335 if (device
->state
== DASD_STATE_READY
&&
336 device
->target
<= DASD_STATE_BASIC
)
337 dasd_state_ready_to_basic(device
);
339 if (device
->state
== DASD_STATE_UNFMT
&&
340 device
->target
<= DASD_STATE_BASIC
)
341 dasd_state_unfmt_to_basic(device
);
343 if (device
->state
== DASD_STATE_BASIC
&&
344 device
->target
<= DASD_STATE_KNOWN
)
345 dasd_state_basic_to_known(device
);
347 if (device
->state
== DASD_STATE_KNOWN
&&
348 device
->target
<= DASD_STATE_NEW
)
349 dasd_state_known_to_new(device
);
355 * This is the main startup/shutdown routine.
358 dasd_change_state(struct dasd_device
*device
)
362 if (device
->state
== device
->target
)
363 /* Already where we want to go today... */
365 if (device
->state
< device
->target
)
366 rc
= dasd_increase_state(device
);
368 rc
= dasd_decrease_state(device
);
369 if (rc
&& rc
!= -EAGAIN
)
370 device
->target
= device
->state
;
372 if (device
->state
== device
->target
)
373 wake_up(&dasd_init_waitq
);
377 * Kick starter for devices that did not complete the startup/shutdown
378 * procedure or were sleeping because of a pending state.
379 * dasd_kick_device will schedule a call do do_kick_device to the kernel
383 do_kick_device(void *data
)
385 struct dasd_device
*device
;
387 device
= (struct dasd_device
*) data
;
388 dasd_change_state(device
);
389 dasd_schedule_bh(device
);
390 dasd_put_device(device
);
394 dasd_kick_device(struct dasd_device
*device
)
396 dasd_get_device(device
);
397 /* queue call to dasd_kick_device to the kernel event daemon. */
398 schedule_work(&device
->kick_work
);
402 * Set the target state for a device and starts the state change.
405 dasd_set_target_state(struct dasd_device
*device
, int target
)
407 /* If we are in probeonly mode stop at DASD_STATE_READY. */
408 if (dasd_probeonly
&& target
> DASD_STATE_READY
)
409 target
= DASD_STATE_READY
;
410 if (device
->target
!= target
) {
411 if (device
->state
== target
)
412 wake_up(&dasd_init_waitq
);
413 device
->target
= target
;
415 if (device
->state
!= device
->target
)
416 dasd_change_state(device
);
420 * Enable devices with device numbers in [from..to].
423 _wait_for_device(struct dasd_device
*device
)
425 return (device
->state
== device
->target
);
429 dasd_enable_device(struct dasd_device
*device
)
431 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
432 if (device
->state
<= DASD_STATE_KNOWN
)
433 /* No discipline for device found. */
434 dasd_set_target_state(device
, DASD_STATE_NEW
);
435 /* Now wait for the devices to come up. */
436 wait_event(dasd_init_waitq
, _wait_for_device(device
));
440 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
442 #ifdef CONFIG_DASD_PROFILE
444 struct dasd_profile_info_t dasd_global_profile
;
445 unsigned int dasd_profile_level
= DASD_PROFILE_OFF
;
448 * Increments counter in global and local profiling structures.
450 #define dasd_profile_counter(value, counter, device) \
453 for (index = 0; index < 31 && value >> (2+index); index++); \
454 dasd_global_profile.counter[index]++; \
455 device->profile.counter[index]++; \
459 * Add profiling information for cqr before execution.
462 dasd_profile_start(struct dasd_device
*device
, struct dasd_ccw_req
* cqr
,
466 unsigned int counter
;
468 if (dasd_profile_level
!= DASD_PROFILE_ON
)
471 /* count the length of the chanq for statistics */
473 list_for_each(l
, &device
->ccw_queue
)
476 dasd_global_profile
.dasd_io_nr_req
[counter
]++;
477 device
->profile
.dasd_io_nr_req
[counter
]++;
481 * Add profiling information for cqr after execution.
484 dasd_profile_end(struct dasd_device
*device
, struct dasd_ccw_req
* cqr
,
487 long strtime
, irqtime
, endtime
, tottime
; /* in microseconds */
488 long tottimeps
, sectors
;
490 if (dasd_profile_level
!= DASD_PROFILE_ON
)
493 sectors
= req
->nr_sectors
;
494 if (!cqr
->buildclk
|| !cqr
->startclk
||
495 !cqr
->stopclk
|| !cqr
->endclk
||
499 strtime
= ((cqr
->startclk
- cqr
->buildclk
) >> 12);
500 irqtime
= ((cqr
->stopclk
- cqr
->startclk
) >> 12);
501 endtime
= ((cqr
->endclk
- cqr
->stopclk
) >> 12);
502 tottime
= ((cqr
->endclk
- cqr
->buildclk
) >> 12);
503 tottimeps
= tottime
/ sectors
;
505 if (!dasd_global_profile
.dasd_io_reqs
)
506 memset(&dasd_global_profile
, 0,
507 sizeof (struct dasd_profile_info_t
));
508 dasd_global_profile
.dasd_io_reqs
++;
509 dasd_global_profile
.dasd_io_sects
+= sectors
;
511 if (!device
->profile
.dasd_io_reqs
)
512 memset(&device
->profile
, 0,
513 sizeof (struct dasd_profile_info_t
));
514 device
->profile
.dasd_io_reqs
++;
515 device
->profile
.dasd_io_sects
+= sectors
;
517 dasd_profile_counter(sectors
, dasd_io_secs
, device
);
518 dasd_profile_counter(tottime
, dasd_io_times
, device
);
519 dasd_profile_counter(tottimeps
, dasd_io_timps
, device
);
520 dasd_profile_counter(strtime
, dasd_io_time1
, device
);
521 dasd_profile_counter(irqtime
, dasd_io_time2
, device
);
522 dasd_profile_counter(irqtime
/ sectors
, dasd_io_time2ps
, device
);
523 dasd_profile_counter(endtime
, dasd_io_time3
, device
);
526 #define dasd_profile_start(device, cqr, req) do {} while (0)
527 #define dasd_profile_end(device, cqr, req) do {} while (0)
528 #endif /* CONFIG_DASD_PROFILE */
531 * Allocate memory for a channel program with 'cplength' channel
532 * command words and 'datasize' additional space. There are two
533 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
534 * memory and 2) dasd_smalloc_request uses the static ccw memory
535 * that gets allocated for each device.
537 struct dasd_ccw_req
*
538 dasd_kmalloc_request(char *magic
, int cplength
, int datasize
,
539 struct dasd_device
* device
)
541 struct dasd_ccw_req
*cqr
;
544 BUG_ON( magic
== NULL
|| datasize
> PAGE_SIZE
||
545 (cplength
*sizeof(struct ccw1
)) > PAGE_SIZE
);
547 cqr
= kzalloc(sizeof(struct dasd_ccw_req
), GFP_ATOMIC
);
549 return ERR_PTR(-ENOMEM
);
552 cqr
->cpaddr
= kcalloc(cplength
, sizeof(struct ccw1
),
553 GFP_ATOMIC
| GFP_DMA
);
554 if (cqr
->cpaddr
== NULL
) {
556 return ERR_PTR(-ENOMEM
);
561 cqr
->data
= kzalloc(datasize
, GFP_ATOMIC
| GFP_DMA
);
562 if (cqr
->data
== NULL
) {
565 return ERR_PTR(-ENOMEM
);
568 strncpy((char *) &cqr
->magic
, magic
, 4);
569 ASCEBC((char *) &cqr
->magic
, 4);
570 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
571 dasd_get_device(device
);
575 struct dasd_ccw_req
*
576 dasd_smalloc_request(char *magic
, int cplength
, int datasize
,
577 struct dasd_device
* device
)
580 struct dasd_ccw_req
*cqr
;
585 BUG_ON( magic
== NULL
|| datasize
> PAGE_SIZE
||
586 (cplength
*sizeof(struct ccw1
)) > PAGE_SIZE
);
588 size
= (sizeof(struct dasd_ccw_req
) + 7L) & -8L;
590 size
+= cplength
* sizeof(struct ccw1
);
593 spin_lock_irqsave(&device
->mem_lock
, flags
);
594 cqr
= (struct dasd_ccw_req
*)
595 dasd_alloc_chunk(&device
->ccw_chunks
, size
);
596 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
598 return ERR_PTR(-ENOMEM
);
599 memset(cqr
, 0, sizeof(struct dasd_ccw_req
));
600 data
= (char *) cqr
+ ((sizeof(struct dasd_ccw_req
) + 7L) & -8L);
603 cqr
->cpaddr
= (struct ccw1
*) data
;
604 data
+= cplength
*sizeof(struct ccw1
);
605 memset(cqr
->cpaddr
, 0, cplength
*sizeof(struct ccw1
));
610 memset(cqr
->data
, 0, datasize
);
612 strncpy((char *) &cqr
->magic
, magic
, 4);
613 ASCEBC((char *) &cqr
->magic
, 4);
614 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
615 dasd_get_device(device
);
620 * Free memory of a channel program. This function needs to free all the
621 * idal lists that might have been created by dasd_set_cda and the
622 * struct dasd_ccw_req itself.
625 dasd_kfree_request(struct dasd_ccw_req
* cqr
, struct dasd_device
* device
)
630 /* Clear any idals used for the request. */
633 clear_normalized_cda(ccw
);
634 } while (ccw
++->flags
& (CCW_FLAG_CC
| CCW_FLAG_DC
));
639 dasd_put_device(device
);
643 dasd_sfree_request(struct dasd_ccw_req
* cqr
, struct dasd_device
* device
)
647 spin_lock_irqsave(&device
->mem_lock
, flags
);
648 dasd_free_chunk(&device
->ccw_chunks
, cqr
);
649 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
650 dasd_put_device(device
);
654 * Check discipline magic in cqr.
657 dasd_check_cqr(struct dasd_ccw_req
*cqr
)
659 struct dasd_device
*device
;
663 device
= cqr
->device
;
664 if (strncmp((char *) &cqr
->magic
, device
->discipline
->ebcname
, 4)) {
665 DEV_MESSAGE(KERN_WARNING
, device
,
666 " dasd_ccw_req 0x%08x magic doesn't match"
667 " discipline 0x%08x",
669 *(unsigned int *) device
->discipline
->name
);
676 * Terminate the current i/o and set the request to clear_pending.
677 * Timer keeps device runnig.
678 * ccw_device_clear can fail if the i/o subsystem
682 dasd_term_IO(struct dasd_ccw_req
* cqr
)
684 struct dasd_device
*device
;
688 rc
= dasd_check_cqr(cqr
);
692 device
= (struct dasd_device
*) cqr
->device
;
693 while ((retries
< 5) && (cqr
->status
== DASD_CQR_IN_IO
)) {
694 rc
= ccw_device_clear(device
->cdev
, (long) cqr
);
696 case 0: /* termination successful */
698 cqr
->status
= DASD_CQR_CLEAR
;
699 cqr
->stopclk
= get_clock();
700 DBF_DEV_EVENT(DBF_DEBUG
, device
,
701 "terminate cqr %p successful",
705 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
706 "device gone, retry");
709 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
714 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
715 "device busy, retry later");
718 DEV_MESSAGE(KERN_ERR
, device
,
719 "line %d unknown RC=%d, please "
720 "report to linux390@de.ibm.com",
727 dasd_schedule_bh(device
);
732 * Start the i/o. This start_IO can fail if the channel is really busy.
733 * In that case set up a timer to start the request later.
736 dasd_start_IO(struct dasd_ccw_req
* cqr
)
738 struct dasd_device
*device
;
742 rc
= dasd_check_cqr(cqr
);
745 device
= (struct dasd_device
*) cqr
->device
;
746 if (cqr
->retries
< 0) {
747 DEV_MESSAGE(KERN_DEBUG
, device
,
748 "start_IO: request %p (%02x/%i) - no retry left.",
749 cqr
, cqr
->status
, cqr
->retries
);
750 cqr
->status
= DASD_CQR_FAILED
;
753 cqr
->startclk
= get_clock();
754 cqr
->starttime
= jiffies
;
756 rc
= ccw_device_start(device
->cdev
, cqr
->cpaddr
, (long) cqr
,
760 cqr
->status
= DASD_CQR_IN_IO
;
761 DBF_DEV_EVENT(DBF_DEBUG
, device
,
762 "start_IO: request %p started successful",
766 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
767 "start_IO: device busy, retry later");
770 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
771 "start_IO: request timeout, retry later");
774 /* -EACCES indicates that the request used only a
775 * subset of the available pathes and all these
777 * Do a retry with all available pathes.
779 cqr
->lpm
= LPM_ANYPATH
;
780 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
781 "start_IO: selected pathes gone,"
782 " retry on all pathes");
786 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
787 "start_IO: device gone, retry");
790 DEV_MESSAGE(KERN_ERR
, device
,
791 "line %d unknown RC=%d, please report"
792 " to linux390@de.ibm.com", __LINE__
, rc
);
800 * Timeout function for dasd devices. This is used for different purposes
801 * 1) missing interrupt handler for normal operation
802 * 2) delayed start of request where start_IO failed with -EBUSY
803 * 3) timeout for missing state change interrupts
804 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
805 * DASD_CQR_QUEUED for 2) and 3).
808 dasd_timeout_device(unsigned long ptr
)
811 struct dasd_device
*device
;
813 device
= (struct dasd_device
*) ptr
;
814 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
815 /* re-activate request queue */
816 device
->stopped
&= ~DASD_STOPPED_PENDING
;
817 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
818 dasd_schedule_bh(device
);
822 * Setup timeout for a device in jiffies.
825 dasd_set_timer(struct dasd_device
*device
, int expires
)
828 if (timer_pending(&device
->timer
))
829 del_timer(&device
->timer
);
832 if (timer_pending(&device
->timer
)) {
833 if (mod_timer(&device
->timer
, jiffies
+ expires
))
836 device
->timer
.function
= dasd_timeout_device
;
837 device
->timer
.data
= (unsigned long) device
;
838 device
->timer
.expires
= jiffies
+ expires
;
839 add_timer(&device
->timer
);
843 * Clear timeout for a device.
846 dasd_clear_timer(struct dasd_device
*device
)
848 if (timer_pending(&device
->timer
))
849 del_timer(&device
->timer
);
853 dasd_handle_killed_request(struct ccw_device
*cdev
, unsigned long intparm
)
855 struct dasd_ccw_req
*cqr
;
856 struct dasd_device
*device
;
858 cqr
= (struct dasd_ccw_req
*) intparm
;
859 if (cqr
->status
!= DASD_CQR_IN_IO
) {
861 "invalid status in handle_killed_request: "
862 "bus_id %s, status %02x",
863 cdev
->dev
.bus_id
, cqr
->status
);
867 device
= (struct dasd_device
*) cqr
->device
;
868 if (device
== NULL
||
869 device
!= dasd_device_from_cdev(cdev
) ||
870 strncmp(device
->discipline
->ebcname
, (char *) &cqr
->magic
, 4)) {
871 MESSAGE(KERN_DEBUG
, "invalid device in request: bus_id %s",
876 /* Schedule request to be retried. */
877 cqr
->status
= DASD_CQR_QUEUED
;
879 dasd_clear_timer(device
);
880 dasd_schedule_bh(device
);
881 dasd_put_device(device
);
885 dasd_handle_state_change_pending(struct dasd_device
*device
)
887 struct dasd_ccw_req
*cqr
;
888 struct list_head
*l
, *n
;
890 /* First of all start sense subsystem status request. */
891 dasd_eer_snss(device
);
893 device
->stopped
&= ~DASD_STOPPED_PENDING
;
895 /* restart all 'running' IO on queue */
896 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
897 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
898 if (cqr
->status
== DASD_CQR_IN_IO
) {
899 cqr
->status
= DASD_CQR_QUEUED
;
902 dasd_clear_timer(device
);
903 dasd_schedule_bh(device
);
907 * Interrupt handler for "normal" ssch-io based dasd devices.
910 dasd_int_handler(struct ccw_device
*cdev
, unsigned long intparm
,
913 struct dasd_ccw_req
*cqr
, *next
;
914 struct dasd_device
*device
;
915 unsigned long long now
;
921 switch (PTR_ERR(irb
)) {
923 dasd_handle_killed_request(cdev
, intparm
);
926 printk(KERN_WARNING
"%s(%s): request timed out\n",
927 __FUNCTION__
, cdev
->dev
.bus_id
);
928 //FIXME - dasd uses own timeout interface...
931 printk(KERN_WARNING
"%s(%s): unknown error %ld\n",
932 __FUNCTION__
, cdev
->dev
.bus_id
, PTR_ERR(irb
));
939 DBF_EVENT(DBF_ERR
, "Interrupt: bus_id %s CS/DS %04x ip %08x",
940 cdev
->dev
.bus_id
, ((irb
->scsw
.cstat
<<8)|irb
->scsw
.dstat
),
941 (unsigned int) intparm
);
943 /* first of all check for state change pending interrupt */
944 mask
= DEV_STAT_ATTENTION
| DEV_STAT_DEV_END
| DEV_STAT_UNIT_EXCEP
;
945 if ((irb
->scsw
.dstat
& mask
) == mask
) {
946 device
= dasd_device_from_cdev(cdev
);
947 if (!IS_ERR(device
)) {
948 dasd_handle_state_change_pending(device
);
949 dasd_put_device(device
);
954 cqr
= (struct dasd_ccw_req
*) intparm
;
956 /* check for unsolicited interrupts */
959 "unsolicited interrupt received: bus_id %s",
964 device
= (struct dasd_device
*) cqr
->device
;
965 if (device
== NULL
||
966 strncmp(device
->discipline
->ebcname
, (char *) &cqr
->magic
, 4)) {
967 MESSAGE(KERN_DEBUG
, "invalid device in request: bus_id %s",
972 /* Check for clear pending */
973 if (cqr
->status
== DASD_CQR_CLEAR
&&
974 irb
->scsw
.fctl
& SCSW_FCTL_CLEAR_FUNC
) {
975 cqr
->status
= DASD_CQR_QUEUED
;
976 dasd_clear_timer(device
);
977 dasd_schedule_bh(device
);
981 /* check status - the request might have been killed by dyn detach */
982 if (cqr
->status
!= DASD_CQR_IN_IO
) {
984 "invalid status: bus_id %s, status %02x",
985 cdev
->dev
.bus_id
, cqr
->status
);
988 DBF_DEV_EVENT(DBF_DEBUG
, device
, "Int: CS/DS 0x%04x for cqr %p",
989 ((irb
->scsw
.cstat
<< 8) | irb
->scsw
.dstat
), cqr
);
991 /* Find out the appropriate era_action. */
992 if (irb
->scsw
.fctl
& SCSW_FCTL_HALT_FUNC
)
993 era
= dasd_era_fatal
;
994 else if (irb
->scsw
.dstat
== (DEV_STAT_CHN_END
| DEV_STAT_DEV_END
) &&
995 irb
->scsw
.cstat
== 0 &&
996 !irb
->esw
.esw0
.erw
.cons
)
998 else if (!test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
))
999 era
= dasd_era_fatal
; /* don't recover this request */
1000 else if (irb
->esw
.esw0
.erw
.cons
)
1001 era
= device
->discipline
->examine_error(cqr
, irb
);
1003 era
= dasd_era_recover
;
1005 DBF_DEV_EVENT(DBF_DEBUG
, device
, "era_code %d", era
);
1007 if (era
== dasd_era_none
) {
1008 cqr
->status
= DASD_CQR_DONE
;
1010 /* Start first request on queue if possible -> fast_io. */
1011 if (cqr
->list
.next
!= &device
->ccw_queue
) {
1012 next
= list_entry(cqr
->list
.next
,
1013 struct dasd_ccw_req
, list
);
1014 if ((next
->status
== DASD_CQR_QUEUED
) &&
1015 (!device
->stopped
)) {
1016 if (device
->discipline
->start_IO(next
) == 0)
1017 expires
= next
->expires
;
1019 DEV_MESSAGE(KERN_DEBUG
, device
, "%s",
1020 "Interrupt fastpath "
1024 } else { /* error */
1025 memcpy(&cqr
->irb
, irb
, sizeof (struct irb
));
1027 /* dump sense data */
1028 dasd_log_sense(cqr
, irb
);
1031 case dasd_era_fatal
:
1032 cqr
->status
= DASD_CQR_FAILED
;
1035 case dasd_era_recover
:
1036 cqr
->status
= DASD_CQR_ERROR
;
1043 dasd_set_timer(device
, expires
);
1045 dasd_clear_timer(device
);
1046 dasd_schedule_bh(device
);
1050 * posts the buffer_cache about a finalized request
1053 dasd_end_request(struct request
*req
, int uptodate
)
1055 if (end_that_request_first(req
, uptodate
, req
->hard_nr_sectors
))
1057 add_disk_randomness(req
->rq_disk
);
1058 end_that_request_last(req
, uptodate
);
1062 * Process finished error recovery ccw.
1065 __dasd_process_erp(struct dasd_device
*device
, struct dasd_ccw_req
*cqr
)
1067 dasd_erp_fn_t erp_fn
;
1069 if (cqr
->status
== DASD_CQR_DONE
)
1070 DBF_DEV_EVENT(DBF_NOTICE
, device
, "%s", "ERP successful");
1072 DEV_MESSAGE(KERN_ERR
, device
, "%s", "ERP unsuccessful");
1073 erp_fn
= device
->discipline
->erp_postaction(cqr
);
1078 * Process ccw request queue.
1081 __dasd_process_ccw_queue(struct dasd_device
* device
,
1082 struct list_head
*final_queue
)
1084 struct list_head
*l
, *n
;
1085 struct dasd_ccw_req
*cqr
;
1086 dasd_erp_fn_t erp_fn
;
1089 /* Process request with final status. */
1090 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1091 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
1092 /* Stop list processing at the first non-final request. */
1093 if (cqr
->status
!= DASD_CQR_DONE
&&
1094 cqr
->status
!= DASD_CQR_FAILED
&&
1095 cqr
->status
!= DASD_CQR_ERROR
)
1097 /* Process requests with DASD_CQR_ERROR */
1098 if (cqr
->status
== DASD_CQR_ERROR
) {
1099 if (cqr
->irb
.scsw
.fctl
& SCSW_FCTL_HALT_FUNC
) {
1100 cqr
->status
= DASD_CQR_FAILED
;
1101 cqr
->stopclk
= get_clock();
1103 if (cqr
->irb
.esw
.esw0
.erw
.cons
) {
1104 erp_fn
= device
->discipline
->
1108 dasd_default_erp_action(cqr
);
1113 /* First of all call extended error reporting. */
1114 if (dasd_eer_enabled(device
) &&
1115 cqr
->status
== DASD_CQR_FAILED
) {
1116 dasd_eer_write(device
, cqr
, DASD_EER_FATALERROR
);
1118 /* restart request */
1119 cqr
->status
= DASD_CQR_QUEUED
;
1121 device
->stopped
|= DASD_STOPPED_QUIESCE
;
1125 /* Process finished ERP request. */
1127 __dasd_process_erp(device
, cqr
);
1131 /* Rechain finished requests to final queue */
1132 cqr
->endclk
= get_clock();
1133 list_move_tail(&cqr
->list
, final_queue
);
1138 dasd_end_request_cb(struct dasd_ccw_req
* cqr
, void *data
)
1140 struct request
*req
;
1141 struct dasd_device
*device
;
1144 req
= (struct request
*) data
;
1145 device
= cqr
->device
;
1146 dasd_profile_end(device
, cqr
, req
);
1147 status
= cqr
->device
->discipline
->free_cp(cqr
,req
);
1148 spin_lock_irq(&device
->request_queue_lock
);
1149 dasd_end_request(req
, status
);
1150 spin_unlock_irq(&device
->request_queue_lock
);
1155 * Fetch requests from the block device queue.
1158 __dasd_process_blk_queue(struct dasd_device
* device
)
1160 request_queue_t
*queue
;
1161 struct request
*req
;
1162 struct dasd_ccw_req
*cqr
;
1165 queue
= device
->request_queue
;
1166 /* No queue ? Then there is nothing to do. */
1171 * We requeue request from the block device queue to the ccw
1172 * queue only in two states. In state DASD_STATE_READY the
1173 * partition detection is done and we need to requeue requests
1174 * for that. State DASD_STATE_ONLINE is normal block device
1177 if (device
->state
!= DASD_STATE_READY
&&
1178 device
->state
!= DASD_STATE_ONLINE
)
1181 /* Now we try to fetch requests from the request queue */
1182 list_for_each_entry(cqr
, &device
->ccw_queue
, list
)
1183 if (cqr
->status
== DASD_CQR_QUEUED
)
1185 while (!blk_queue_plugged(queue
) &&
1186 elv_next_request(queue
) &&
1187 nr_queued
< DASD_CHANQ_MAX_SIZE
) {
1188 req
= elv_next_request(queue
);
1190 if (device
->features
& DASD_FEATURE_READONLY
&&
1191 rq_data_dir(req
) == WRITE
) {
1192 DBF_DEV_EVENT(DBF_ERR
, device
,
1193 "Rejecting write request %p",
1195 blkdev_dequeue_request(req
);
1196 dasd_end_request(req
, 0);
1199 if (device
->stopped
& DASD_STOPPED_DC_EIO
) {
1200 blkdev_dequeue_request(req
);
1201 dasd_end_request(req
, 0);
1204 cqr
= device
->discipline
->build_cp(device
, req
);
1206 if (PTR_ERR(cqr
) == -ENOMEM
)
1207 break; /* terminate request queue loop */
1208 DBF_DEV_EVENT(DBF_ERR
, device
,
1209 "CCW creation failed (rc=%ld) "
1212 blkdev_dequeue_request(req
);
1213 dasd_end_request(req
, 0);
1216 cqr
->callback
= dasd_end_request_cb
;
1217 cqr
->callback_data
= (void *) req
;
1218 cqr
->status
= DASD_CQR_QUEUED
;
1219 blkdev_dequeue_request(req
);
1220 list_add_tail(&cqr
->list
, &device
->ccw_queue
);
1221 dasd_profile_start(device
, cqr
, req
);
1227 * Take a look at the first request on the ccw queue and check
1228 * if it reached its expire time. If so, terminate the IO.
1231 __dasd_check_expire(struct dasd_device
* device
)
1233 struct dasd_ccw_req
*cqr
;
1235 if (list_empty(&device
->ccw_queue
))
1237 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, list
);
1238 if (cqr
->status
== DASD_CQR_IN_IO
&& cqr
->expires
!= 0) {
1239 if (time_after_eq(jiffies
, cqr
->expires
+ cqr
->starttime
)) {
1240 if (device
->discipline
->term_IO(cqr
) != 0)
1241 /* Hmpf, try again in 1/10 sec */
1242 dasd_set_timer(device
, 10);
1248 * Take a look at the first request on the ccw queue and check
1249 * if it needs to be started.
1252 __dasd_start_head(struct dasd_device
* device
)
1254 struct dasd_ccw_req
*cqr
;
1257 if (list_empty(&device
->ccw_queue
))
1259 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, list
);
1260 if (cqr
->status
!= DASD_CQR_QUEUED
)
1262 /* Non-temporary stop condition will trigger fail fast */
1263 if (device
->stopped
& ~DASD_STOPPED_PENDING
&&
1264 test_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
) &&
1265 (!dasd_eer_enabled(device
))) {
1266 cqr
->status
= DASD_CQR_FAILED
;
1267 dasd_schedule_bh(device
);
1270 /* Don't try to start requests if device is stopped */
1271 if (device
->stopped
)
1274 rc
= device
->discipline
->start_IO(cqr
);
1276 dasd_set_timer(device
, cqr
->expires
);
1277 else if (rc
== -EACCES
) {
1278 dasd_schedule_bh(device
);
1280 /* Hmpf, try again in 1/2 sec */
1281 dasd_set_timer(device
, 50);
1285 * Remove requests from the ccw queue.
1288 dasd_flush_ccw_queue(struct dasd_device
* device
, int all
)
1290 struct list_head flush_queue
;
1291 struct list_head
*l
, *n
;
1292 struct dasd_ccw_req
*cqr
;
1294 INIT_LIST_HEAD(&flush_queue
);
1295 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1296 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1297 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
1298 /* Flush all request or only block device requests? */
1299 if (all
== 0 && cqr
->callback
== dasd_end_request_cb
)
1301 if (cqr
->status
== DASD_CQR_IN_IO
)
1302 device
->discipline
->term_IO(cqr
);
1303 if (cqr
->status
!= DASD_CQR_DONE
||
1304 cqr
->status
!= DASD_CQR_FAILED
) {
1305 cqr
->status
= DASD_CQR_FAILED
;
1306 cqr
->stopclk
= get_clock();
1308 /* Process finished ERP request. */
1310 __dasd_process_erp(device
, cqr
);
1313 /* Rechain request on device request queue */
1314 cqr
->endclk
= get_clock();
1315 list_move_tail(&cqr
->list
, &flush_queue
);
1317 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1318 /* Now call the callback function of flushed requests */
1319 list_for_each_safe(l
, n
, &flush_queue
) {
1320 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
1321 if (cqr
->callback
!= NULL
)
1322 (cqr
->callback
)(cqr
, cqr
->callback_data
);
1327 * Acquire the device lock and process queues for the device.
1330 dasd_tasklet(struct dasd_device
* device
)
1332 struct list_head final_queue
;
1333 struct list_head
*l
, *n
;
1334 struct dasd_ccw_req
*cqr
;
1336 atomic_set (&device
->tasklet_scheduled
, 0);
1337 INIT_LIST_HEAD(&final_queue
);
1338 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1339 /* Check expire time of first request on the ccw queue. */
1340 __dasd_check_expire(device
);
1341 /* Finish off requests on ccw queue */
1342 __dasd_process_ccw_queue(device
, &final_queue
);
1343 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1344 /* Now call the callback function of requests with final status */
1345 list_for_each_safe(l
, n
, &final_queue
) {
1346 cqr
= list_entry(l
, struct dasd_ccw_req
, list
);
1347 list_del_init(&cqr
->list
);
1348 if (cqr
->callback
!= NULL
)
1349 (cqr
->callback
)(cqr
, cqr
->callback_data
);
1351 spin_lock_irq(&device
->request_queue_lock
);
1352 spin_lock(get_ccwdev_lock(device
->cdev
));
1353 /* Get new request from the block device request queue */
1354 __dasd_process_blk_queue(device
);
1355 /* Now check if the head of the ccw queue needs to be started. */
1356 __dasd_start_head(device
);
1357 spin_unlock(get_ccwdev_lock(device
->cdev
));
1358 spin_unlock_irq(&device
->request_queue_lock
);
1359 dasd_put_device(device
);
1363 * Schedules a call to dasd_tasklet over the device tasklet.
1366 dasd_schedule_bh(struct dasd_device
* device
)
1368 /* Protect against rescheduling. */
1369 if (atomic_cmpxchg (&device
->tasklet_scheduled
, 0, 1) != 0)
1371 dasd_get_device(device
);
1372 tasklet_hi_schedule(&device
->tasklet
);
1376 * Queue a request to the head of the ccw_queue. Start the I/O if
1380 dasd_add_request_head(struct dasd_ccw_req
*req
)
1382 struct dasd_device
*device
;
1383 unsigned long flags
;
1385 device
= req
->device
;
1386 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1387 req
->status
= DASD_CQR_QUEUED
;
1388 req
->device
= device
;
1389 list_add(&req
->list
, &device
->ccw_queue
);
1390 /* let the bh start the request to keep them in order */
1391 dasd_schedule_bh(device
);
1392 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1396 * Queue a request to the tail of the ccw_queue. Start the I/O if
1400 dasd_add_request_tail(struct dasd_ccw_req
*req
)
1402 struct dasd_device
*device
;
1403 unsigned long flags
;
1405 device
= req
->device
;
1406 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1407 req
->status
= DASD_CQR_QUEUED
;
1408 req
->device
= device
;
1409 list_add_tail(&req
->list
, &device
->ccw_queue
);
1410 /* let the bh start the request to keep them in order */
1411 dasd_schedule_bh(device
);
1412 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1419 dasd_wakeup_cb(struct dasd_ccw_req
*cqr
, void *data
)
1421 wake_up((wait_queue_head_t
*) data
);
1425 _wait_for_wakeup(struct dasd_ccw_req
*cqr
)
1427 struct dasd_device
*device
;
1430 device
= cqr
->device
;
1431 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1432 rc
= ((cqr
->status
== DASD_CQR_DONE
||
1433 cqr
->status
== DASD_CQR_FAILED
) &&
1434 list_empty(&cqr
->list
));
1435 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1440 * Attempts to start a special ccw queue and waits for its completion.
1443 dasd_sleep_on(struct dasd_ccw_req
* cqr
)
1445 wait_queue_head_t wait_q
;
1446 struct dasd_device
*device
;
1449 device
= cqr
->device
;
1450 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1452 init_waitqueue_head (&wait_q
);
1453 cqr
->callback
= dasd_wakeup_cb
;
1454 cqr
->callback_data
= (void *) &wait_q
;
1455 cqr
->status
= DASD_CQR_QUEUED
;
1456 list_add_tail(&cqr
->list
, &device
->ccw_queue
);
1458 /* let the bh start the request to keep them in order */
1459 dasd_schedule_bh(device
);
1461 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1463 wait_event(wait_q
, _wait_for_wakeup(cqr
));
1465 /* Request status is either done or failed. */
1466 rc
= (cqr
->status
== DASD_CQR_FAILED
) ? -EIO
: 0;
1471 * Attempts to start a special ccw queue and wait interruptible
1472 * for its completion.
1475 dasd_sleep_on_interruptible(struct dasd_ccw_req
* cqr
)
1477 wait_queue_head_t wait_q
;
1478 struct dasd_device
*device
;
1481 device
= cqr
->device
;
1482 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1484 init_waitqueue_head (&wait_q
);
1485 cqr
->callback
= dasd_wakeup_cb
;
1486 cqr
->callback_data
= (void *) &wait_q
;
1487 cqr
->status
= DASD_CQR_QUEUED
;
1488 list_add_tail(&cqr
->list
, &device
->ccw_queue
);
1490 /* let the bh start the request to keep them in order */
1491 dasd_schedule_bh(device
);
1492 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1496 rc
= wait_event_interruptible(wait_q
, _wait_for_wakeup(cqr
));
1497 if (rc
!= -ERESTARTSYS
) {
1498 /* Request is final (done or failed) */
1499 rc
= (cqr
->status
== DASD_CQR_DONE
) ? 0 : -EIO
;
1502 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1503 switch (cqr
->status
) {
1504 case DASD_CQR_IN_IO
:
1505 /* terminate runnig cqr */
1506 if (device
->discipline
->term_IO
) {
1508 device
->discipline
->term_IO(cqr
);
1510 * wait (non-interruptible) for final status
1511 * because signal ist still pending
1513 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1514 wait_event(wait_q
, _wait_for_wakeup(cqr
));
1515 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1516 rc
= (cqr
->status
== DASD_CQR_DONE
) ? 0 : -EIO
;
1520 case DASD_CQR_QUEUED
:
1522 list_del_init(&cqr
->list
);
1527 /* cqr with 'non-interruptable' status - just wait */
1530 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1536 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
1537 * for eckd devices) the currently running request has to be terminated
1538 * and be put back to status queued, before the special request is added
1539 * to the head of the queue. Then the special request is waited on normally.
1542 _dasd_term_running_cqr(struct dasd_device
*device
)
1544 struct dasd_ccw_req
*cqr
;
1547 if (list_empty(&device
->ccw_queue
))
1549 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, list
);
1550 rc
= device
->discipline
->term_IO(cqr
);
1552 /* termination successful */
1553 cqr
->status
= DASD_CQR_QUEUED
;
1554 cqr
->startclk
= cqr
->stopclk
= 0;
1561 dasd_sleep_on_immediatly(struct dasd_ccw_req
* cqr
)
1563 wait_queue_head_t wait_q
;
1564 struct dasd_device
*device
;
1567 device
= cqr
->device
;
1568 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1569 rc
= _dasd_term_running_cqr(device
);
1571 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1575 init_waitqueue_head (&wait_q
);
1576 cqr
->callback
= dasd_wakeup_cb
;
1577 cqr
->callback_data
= (void *) &wait_q
;
1578 cqr
->status
= DASD_CQR_QUEUED
;
1579 list_add(&cqr
->list
, &device
->ccw_queue
);
1581 /* let the bh start the request to keep them in order */
1582 dasd_schedule_bh(device
);
1584 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1586 wait_event(wait_q
, _wait_for_wakeup(cqr
));
1588 /* Request status is either done or failed. */
1589 rc
= (cqr
->status
== DASD_CQR_FAILED
) ? -EIO
: 0;
1594 * Cancels a request that was started with dasd_sleep_on_req.
1595 * This is useful to timeout requests. The request will be
1596 * terminated if it is currently in i/o.
1597 * Returns 1 if the request has been terminated.
1600 dasd_cancel_req(struct dasd_ccw_req
*cqr
)
1602 struct dasd_device
*device
= cqr
->device
;
1603 unsigned long flags
;
1607 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1608 switch (cqr
->status
) {
1609 case DASD_CQR_QUEUED
:
1610 /* request was not started - just set to failed */
1611 cqr
->status
= DASD_CQR_FAILED
;
1613 case DASD_CQR_IN_IO
:
1614 /* request in IO - terminate IO and release again */
1615 if (device
->discipline
->term_IO(cqr
) != 0)
1616 /* what to do if unable to terminate ??????
1618 cqr
->status
= DASD_CQR_FAILED
;
1619 cqr
->stopclk
= get_clock();
1623 case DASD_CQR_FAILED
:
1624 /* already finished - do nothing */
1627 DEV_MESSAGE(KERN_ALERT
, device
,
1628 "invalid status %02x in request",
1633 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1634 dasd_schedule_bh(device
);
1639 * SECTION: Block device operations (request queue, partitions, open, release).
1643 * Dasd request queue function. Called from ll_rw_blk.c
1646 do_dasd_request(request_queue_t
* queue
)
1648 struct dasd_device
*device
;
1650 device
= (struct dasd_device
*) queue
->queuedata
;
1651 spin_lock(get_ccwdev_lock(device
->cdev
));
1652 /* Get new request from the block device request queue */
1653 __dasd_process_blk_queue(device
);
1654 /* Now check if the head of the ccw queue needs to be started. */
1655 __dasd_start_head(device
);
1656 spin_unlock(get_ccwdev_lock(device
->cdev
));
1660 * Allocate and initialize request queue and default I/O scheduler.
1663 dasd_alloc_queue(struct dasd_device
* device
)
1667 device
->request_queue
= blk_init_queue(do_dasd_request
,
1668 &device
->request_queue_lock
);
1669 if (device
->request_queue
== NULL
)
1672 device
->request_queue
->queuedata
= device
;
1674 elevator_exit(device
->request_queue
->elevator
);
1675 rc
= elevator_init(device
->request_queue
, "deadline");
1677 blk_cleanup_queue(device
->request_queue
);
1684 * Allocate and initialize request queue.
1687 dasd_setup_queue(struct dasd_device
* device
)
1691 blk_queue_hardsect_size(device
->request_queue
, device
->bp_block
);
1692 max
= device
->discipline
->max_blocks
<< device
->s2b_shift
;
1693 blk_queue_max_sectors(device
->request_queue
, max
);
1694 blk_queue_max_phys_segments(device
->request_queue
, -1L);
1695 blk_queue_max_hw_segments(device
->request_queue
, -1L);
1696 blk_queue_max_segment_size(device
->request_queue
, -1L);
1697 blk_queue_segment_boundary(device
->request_queue
, -1L);
1698 blk_queue_ordered(device
->request_queue
, QUEUE_ORDERED_TAG
, NULL
);
1702 * Deactivate and free request queue.
1705 dasd_free_queue(struct dasd_device
* device
)
1707 if (device
->request_queue
) {
1708 blk_cleanup_queue(device
->request_queue
);
1709 device
->request_queue
= NULL
;
1714 * Flush request on the request queue.
1717 dasd_flush_request_queue(struct dasd_device
* device
)
1719 struct request
*req
;
1721 if (!device
->request_queue
)
1724 spin_lock_irq(&device
->request_queue_lock
);
1725 while (!list_empty(&device
->request_queue
->queue_head
)) {
1726 req
= elv_next_request(device
->request_queue
);
1729 dasd_end_request(req
, 0);
1730 blkdev_dequeue_request(req
);
1732 spin_unlock_irq(&device
->request_queue_lock
);
1736 dasd_open(struct inode
*inp
, struct file
*filp
)
1738 struct gendisk
*disk
= inp
->i_bdev
->bd_disk
;
1739 struct dasd_device
*device
= disk
->private_data
;
1742 atomic_inc(&device
->open_count
);
1743 if (test_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
1748 if (!try_module_get(device
->discipline
->owner
)) {
1753 if (dasd_probeonly
) {
1754 DEV_MESSAGE(KERN_INFO
, device
, "%s",
1755 "No access to device due to probeonly mode");
1760 if (device
->state
<= DASD_STATE_BASIC
) {
1761 DBF_DEV_EVENT(DBF_ERR
, device
, " %s",
1762 " Cannot open unrecognized device");
1770 module_put(device
->discipline
->owner
);
1772 atomic_dec(&device
->open_count
);
1777 dasd_release(struct inode
*inp
, struct file
*filp
)
1779 struct gendisk
*disk
= inp
->i_bdev
->bd_disk
;
1780 struct dasd_device
*device
= disk
->private_data
;
1782 atomic_dec(&device
->open_count
);
1783 module_put(device
->discipline
->owner
);
1788 * Return disk geometry.
1791 dasd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
1793 struct dasd_device
*device
;
1795 device
= bdev
->bd_disk
->private_data
;
1799 if (!device
->discipline
||
1800 !device
->discipline
->fill_geometry
)
1803 device
->discipline
->fill_geometry(device
, geo
);
1804 geo
->start
= get_start_sect(bdev
) >> device
->s2b_shift
;
1808 struct block_device_operations
1809 dasd_device_operations
= {
1810 .owner
= THIS_MODULE
,
1812 .release
= dasd_release
,
1813 .ioctl
= dasd_ioctl
,
1814 .compat_ioctl
= dasd_compat_ioctl
,
1815 .getgeo
= dasd_getgeo
,
1822 #ifdef CONFIG_PROC_FS
1826 if (dasd_page_cache
!= NULL
) {
1827 kmem_cache_destroy(dasd_page_cache
);
1828 dasd_page_cache
= NULL
;
1830 dasd_gendisk_exit();
1832 devfs_remove("dasd");
1833 if (dasd_debug_area
!= NULL
) {
1834 debug_unregister(dasd_debug_area
);
1835 dasd_debug_area
= NULL
;
1840 * SECTION: common functions for ccw_driver use
1844 * Initial attempt at a probe function. this can be simplified once
1845 * the other detection code is gone.
1848 dasd_generic_probe (struct ccw_device
*cdev
,
1849 struct dasd_discipline
*discipline
)
1853 ret
= dasd_add_sysfs_files(cdev
);
1856 "dasd_generic_probe: could not add sysfs entries "
1857 "for %s\n", cdev
->dev
.bus_id
);
1859 cdev
->handler
= &dasd_int_handler
;
1866 * This will one day be called from a global not_oper handler.
1867 * It is also used by driver_unregister during module unload.
1870 dasd_generic_remove (struct ccw_device
*cdev
)
1872 struct dasd_device
*device
;
1874 cdev
->handler
= NULL
;
1876 dasd_remove_sysfs_files(cdev
);
1877 device
= dasd_device_from_cdev(cdev
);
1880 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
1881 /* Already doing offline processing */
1882 dasd_put_device(device
);
1886 * This device is removed unconditionally. Set offline
1887 * flag to prevent dasd_open from opening it while it is
1888 * no quite down yet.
1890 dasd_set_target_state(device
, DASD_STATE_NEW
);
1891 /* dasd_delete_device destroys the device reference. */
1892 dasd_delete_device(device
);
1896 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
1897 * the device is detected for the first time and is supposed to be used
1898 * or the user has started activation through sysfs.
1901 dasd_generic_set_online (struct ccw_device
*cdev
,
1902 struct dasd_discipline
*base_discipline
)
1905 struct dasd_discipline
*discipline
;
1906 struct dasd_device
*device
;
1909 device
= dasd_create_device(cdev
);
1911 return PTR_ERR(device
);
1913 discipline
= base_discipline
;
1914 if (device
->features
& DASD_FEATURE_USEDIAG
) {
1915 if (!dasd_diag_discipline_pointer
) {
1916 printk (KERN_WARNING
1917 "dasd_generic couldn't online device %s "
1918 "- discipline DIAG not available\n",
1920 dasd_delete_device(device
);
1923 discipline
= dasd_diag_discipline_pointer
;
1925 if (!try_module_get(base_discipline
->owner
)) {
1926 dasd_delete_device(device
);
1929 if (!try_module_get(discipline
->owner
)) {
1930 module_put(base_discipline
->owner
);
1931 dasd_delete_device(device
);
1934 device
->base_discipline
= base_discipline
;
1935 device
->discipline
= discipline
;
1937 rc
= discipline
->check_device(device
);
1939 printk (KERN_WARNING
1940 "dasd_generic couldn't online device %s "
1941 "with discipline %s rc=%i\n",
1942 cdev
->dev
.bus_id
, discipline
->name
, rc
);
1943 module_put(discipline
->owner
);
1944 module_put(base_discipline
->owner
);
1945 dasd_delete_device(device
);
1949 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
1950 if (device
->state
<= DASD_STATE_KNOWN
) {
1951 printk (KERN_WARNING
1952 "dasd_generic discipline not found for %s\n",
1955 dasd_set_target_state(device
, DASD_STATE_NEW
);
1956 dasd_delete_device(device
);
1958 pr_debug("dasd_generic device %s found\n",
1961 /* FIXME: we have to wait for the root device but we don't want
1962 * to wait for each single device but for all at once. */
1963 wait_event(dasd_init_waitq
, _wait_for_device(device
));
1965 dasd_put_device(device
);
1971 dasd_generic_set_offline (struct ccw_device
*cdev
)
1973 struct dasd_device
*device
;
1974 int max_count
, open_count
;
1976 device
= dasd_device_from_cdev(cdev
);
1978 return PTR_ERR(device
);
1979 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
1980 /* Already doing offline processing */
1981 dasd_put_device(device
);
1985 * We must make sure that this device is currently not in use.
1986 * The open_count is increased for every opener, that includes
1987 * the blkdev_get in dasd_scan_partitions. We are only interested
1988 * in the other openers.
1990 max_count
= device
->bdev
? 0 : -1;
1991 open_count
= (int) atomic_read(&device
->open_count
);
1992 if (open_count
> max_count
) {
1994 printk (KERN_WARNING
"Can't offline dasd device with "
1995 "open count = %i.\n",
1998 printk (KERN_WARNING
"%s",
1999 "Can't offline dasd device due to internal "
2001 clear_bit(DASD_FLAG_OFFLINE
, &device
->flags
);
2002 dasd_put_device(device
);
2005 dasd_set_target_state(device
, DASD_STATE_NEW
);
2006 /* dasd_delete_device destroys the device reference. */
2007 dasd_delete_device(device
);
2013 dasd_generic_notify(struct ccw_device
*cdev
, int event
)
2015 struct dasd_device
*device
;
2016 struct dasd_ccw_req
*cqr
;
2017 unsigned long flags
;
2020 device
= dasd_device_from_cdev(cdev
);
2023 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
2028 /* First of all call extended error reporting. */
2029 dasd_eer_write(device
, NULL
, DASD_EER_NOPATH
);
2031 if (device
->state
< DASD_STATE_BASIC
)
2033 /* Device is active. We want to keep it. */
2034 if (test_bit(DASD_FLAG_DSC_ERROR
, &device
->flags
)) {
2035 list_for_each_entry(cqr
, &device
->ccw_queue
, list
)
2036 if (cqr
->status
== DASD_CQR_IN_IO
)
2037 cqr
->status
= DASD_CQR_FAILED
;
2038 device
->stopped
|= DASD_STOPPED_DC_EIO
;
2040 list_for_each_entry(cqr
, &device
->ccw_queue
, list
)
2041 if (cqr
->status
== DASD_CQR_IN_IO
) {
2042 cqr
->status
= DASD_CQR_QUEUED
;
2045 device
->stopped
|= DASD_STOPPED_DC_WAIT
;
2046 dasd_set_timer(device
, 0);
2048 dasd_schedule_bh(device
);
2052 /* FIXME: add a sanity check. */
2053 device
->stopped
&= ~(DASD_STOPPED_DC_WAIT
|DASD_STOPPED_DC_EIO
);
2054 dasd_schedule_bh(device
);
2058 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
2059 dasd_put_device(device
);
2064 * Automatically online either all dasd devices (dasd_autodetect) or
2065 * all devices specified with dasd= parameters.
2068 __dasd_auto_online(struct device
*dev
, void *data
)
2070 struct ccw_device
*cdev
;
2072 cdev
= to_ccwdev(dev
);
2073 if (dasd_autodetect
|| dasd_busid_known(cdev
->dev
.bus_id
) == 0)
2074 ccw_device_set_online(cdev
);
2079 dasd_generic_auto_online (struct ccw_driver
*dasd_discipline_driver
)
2081 struct device_driver
*drv
;
2083 drv
= get_driver(&dasd_discipline_driver
->driver
);
2084 driver_for_each_device(drv
, NULL
, NULL
, __dasd_auto_online
);
2094 init_waitqueue_head(&dasd_init_waitq
);
2096 /* register 'common' DASD debug area, used for all DBF_XXX calls */
2097 dasd_debug_area
= debug_register("dasd", 1, 2, 8 * sizeof (long));
2098 if (dasd_debug_area
== NULL
) {
2102 debug_register_view(dasd_debug_area
, &debug_sprintf_view
);
2103 debug_set_level(dasd_debug_area
, DBF_EMERG
);
2105 DBF_EVENT(DBF_EMERG
, "%s", "debug area created");
2107 dasd_diag_discipline_pointer
= NULL
;
2109 rc
= devfs_mk_dir("dasd");
2112 rc
= dasd_devmap_init();
2115 rc
= dasd_gendisk_init();
2121 rc
= dasd_eer_init();
2124 #ifdef CONFIG_PROC_FS
2125 rc
= dasd_proc_init();
2132 MESSAGE(KERN_INFO
, "%s", "initialization not performed due to errors");
2137 module_init(dasd_init
);
2138 module_exit(dasd_exit
);
2140 EXPORT_SYMBOL(dasd_debug_area
);
2141 EXPORT_SYMBOL(dasd_diag_discipline_pointer
);
2143 EXPORT_SYMBOL(dasd_add_request_head
);
2144 EXPORT_SYMBOL(dasd_add_request_tail
);
2145 EXPORT_SYMBOL(dasd_cancel_req
);
2146 EXPORT_SYMBOL(dasd_clear_timer
);
2147 EXPORT_SYMBOL(dasd_enable_device
);
2148 EXPORT_SYMBOL(dasd_int_handler
);
2149 EXPORT_SYMBOL(dasd_kfree_request
);
2150 EXPORT_SYMBOL(dasd_kick_device
);
2151 EXPORT_SYMBOL(dasd_kmalloc_request
);
2152 EXPORT_SYMBOL(dasd_schedule_bh
);
2153 EXPORT_SYMBOL(dasd_set_target_state
);
2154 EXPORT_SYMBOL(dasd_set_timer
);
2155 EXPORT_SYMBOL(dasd_sfree_request
);
2156 EXPORT_SYMBOL(dasd_sleep_on
);
2157 EXPORT_SYMBOL(dasd_sleep_on_immediatly
);
2158 EXPORT_SYMBOL(dasd_sleep_on_interruptible
);
2159 EXPORT_SYMBOL(dasd_smalloc_request
);
2160 EXPORT_SYMBOL(dasd_start_IO
);
2161 EXPORT_SYMBOL(dasd_term_IO
);
2163 EXPORT_SYMBOL_GPL(dasd_generic_probe
);
2164 EXPORT_SYMBOL_GPL(dasd_generic_remove
);
2165 EXPORT_SYMBOL_GPL(dasd_generic_notify
);
2166 EXPORT_SYMBOL_GPL(dasd_generic_set_online
);
2167 EXPORT_SYMBOL_GPL(dasd_generic_set_offline
);
2168 EXPORT_SYMBOL_GPL(dasd_generic_auto_online
);
2171 * Overrides for Emacs so that we follow Linus's tabbing style.
2172 * Emacs will notice this stuff at the end of the file and automatically
2173 * adjust the settings for this buffer only. This must remain at the end
2175 * ---------------------------------------------------------------------------
2178 * c-brace-imaginary-offset: 0
2179 * c-brace-offset: -4
2180 * c-argdecl-indent: 4
2181 * c-label-offset: -4
2182 * c-continued-statement-offset: 4
2183 * c-continued-brace-offset: 0
2184 * indent-tabs-mode: 1