2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Horst Hummel <Horst.Hummel@de.ibm.com>
4 * Carsten Otte <Cotte@de.ibm.com>
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
7 * Copyright IBM Corp. 1999, 2009
10 #define KMSG_COMPONENT "dasd"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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/hdreg.h>
20 #include <linux/async.h>
21 #include <linux/mutex.h>
22 #include <linux/debugfs.h>
23 #include <linux/seq_file.h>
24 #include <linux/vmalloc.h>
26 #include <asm/ccwdev.h>
27 #include <asm/ebcdic.h>
28 #include <asm/idals.h>
33 #define PRINTK_HEADER "dasd:"
37 * SECTION: Constant definitions to be used within this file
39 #define DASD_CHANQ_MAX_SIZE 4
42 * SECTION: exported variables of dasd.c
44 debug_info_t
*dasd_debug_area
;
45 static struct dentry
*dasd_debugfs_root_entry
;
46 struct dasd_discipline
*dasd_diag_discipline_pointer
;
47 void dasd_int_handler(struct ccw_device
*, unsigned long, struct irb
*);
49 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
50 MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
51 " Copyright IBM Corp. 2000");
52 MODULE_SUPPORTED_DEVICE("dasd");
53 MODULE_LICENSE("GPL");
56 * SECTION: prototypes for static functions of dasd.c
58 static int dasd_alloc_queue(struct dasd_block
*);
59 static void dasd_setup_queue(struct dasd_block
*);
60 static void dasd_free_queue(struct dasd_block
*);
61 static void dasd_flush_request_queue(struct dasd_block
*);
62 static int dasd_flush_block_queue(struct dasd_block
*);
63 static void dasd_device_tasklet(struct dasd_device
*);
64 static void dasd_block_tasklet(struct dasd_block
*);
65 static void do_kick_device(struct work_struct
*);
66 static void do_restore_device(struct work_struct
*);
67 static void do_reload_device(struct work_struct
*);
68 static void dasd_return_cqr_cb(struct dasd_ccw_req
*, void *);
69 static void dasd_device_timeout(unsigned long);
70 static void dasd_block_timeout(unsigned long);
71 static void __dasd_process_erp(struct dasd_device
*, struct dasd_ccw_req
*);
72 static void dasd_profile_init(struct dasd_profile
*, struct dentry
*);
73 static void dasd_profile_exit(struct dasd_profile
*);
76 * SECTION: Operations on the device structure.
78 static wait_queue_head_t dasd_init_waitq
;
79 static wait_queue_head_t dasd_flush_wq
;
80 static wait_queue_head_t generic_waitq
;
81 static wait_queue_head_t shutdown_waitq
;
84 * Allocate memory for a new device structure.
86 struct dasd_device
*dasd_alloc_device(void)
88 struct dasd_device
*device
;
90 device
= kzalloc(sizeof(struct dasd_device
), GFP_ATOMIC
);
92 return ERR_PTR(-ENOMEM
);
94 /* Get two pages for normal block device operations. */
95 device
->ccw_mem
= (void *) __get_free_pages(GFP_ATOMIC
| GFP_DMA
, 1);
96 if (!device
->ccw_mem
) {
98 return ERR_PTR(-ENOMEM
);
100 /* Get one page for error recovery. */
101 device
->erp_mem
= (void *) get_zeroed_page(GFP_ATOMIC
| GFP_DMA
);
102 if (!device
->erp_mem
) {
103 free_pages((unsigned long) device
->ccw_mem
, 1);
105 return ERR_PTR(-ENOMEM
);
108 dasd_init_chunklist(&device
->ccw_chunks
, device
->ccw_mem
, PAGE_SIZE
*2);
109 dasd_init_chunklist(&device
->erp_chunks
, device
->erp_mem
, PAGE_SIZE
);
110 spin_lock_init(&device
->mem_lock
);
111 atomic_set(&device
->tasklet_scheduled
, 0);
112 tasklet_init(&device
->tasklet
,
113 (void (*)(unsigned long)) dasd_device_tasklet
,
114 (unsigned long) device
);
115 INIT_LIST_HEAD(&device
->ccw_queue
);
116 init_timer(&device
->timer
);
117 device
->timer
.function
= dasd_device_timeout
;
118 device
->timer
.data
= (unsigned long) device
;
119 INIT_WORK(&device
->kick_work
, do_kick_device
);
120 INIT_WORK(&device
->restore_device
, do_restore_device
);
121 INIT_WORK(&device
->reload_device
, do_reload_device
);
122 device
->state
= DASD_STATE_NEW
;
123 device
->target
= DASD_STATE_NEW
;
124 mutex_init(&device
->state_mutex
);
125 spin_lock_init(&device
->profile
.lock
);
130 * Free memory of a device structure.
132 void dasd_free_device(struct dasd_device
*device
)
134 kfree(device
->private);
135 free_page((unsigned long) device
->erp_mem
);
136 free_pages((unsigned long) device
->ccw_mem
, 1);
141 * Allocate memory for a new device structure.
143 struct dasd_block
*dasd_alloc_block(void)
145 struct dasd_block
*block
;
147 block
= kzalloc(sizeof(*block
), GFP_ATOMIC
);
149 return ERR_PTR(-ENOMEM
);
150 /* open_count = 0 means device online but not in use */
151 atomic_set(&block
->open_count
, -1);
153 spin_lock_init(&block
->request_queue_lock
);
154 atomic_set(&block
->tasklet_scheduled
, 0);
155 tasklet_init(&block
->tasklet
,
156 (void (*)(unsigned long)) dasd_block_tasklet
,
157 (unsigned long) block
);
158 INIT_LIST_HEAD(&block
->ccw_queue
);
159 spin_lock_init(&block
->queue_lock
);
160 init_timer(&block
->timer
);
161 block
->timer
.function
= dasd_block_timeout
;
162 block
->timer
.data
= (unsigned long) block
;
163 spin_lock_init(&block
->profile
.lock
);
169 * Free memory of a device structure.
171 void dasd_free_block(struct dasd_block
*block
)
177 * Make a new device known to the system.
179 static int dasd_state_new_to_known(struct dasd_device
*device
)
184 * As long as the device is not in state DASD_STATE_NEW we want to
185 * keep the reference count > 0.
187 dasd_get_device(device
);
190 rc
= dasd_alloc_queue(device
->block
);
192 dasd_put_device(device
);
196 device
->state
= DASD_STATE_KNOWN
;
201 * Let the system forget about a device.
203 static int dasd_state_known_to_new(struct dasd_device
*device
)
205 /* Disable extended error reporting for this device. */
206 dasd_eer_disable(device
);
207 /* Forget the discipline information. */
208 if (device
->discipline
) {
209 if (device
->discipline
->uncheck_device
)
210 device
->discipline
->uncheck_device(device
);
211 module_put(device
->discipline
->owner
);
213 device
->discipline
= NULL
;
214 if (device
->base_discipline
)
215 module_put(device
->base_discipline
->owner
);
216 device
->base_discipline
= NULL
;
217 device
->state
= DASD_STATE_NEW
;
220 dasd_free_queue(device
->block
);
222 /* Give up reference we took in dasd_state_new_to_known. */
223 dasd_put_device(device
);
227 static struct dentry
*dasd_debugfs_setup(const char *name
,
228 struct dentry
*base_dentry
)
234 pde
= debugfs_create_dir(name
, base_dentry
);
235 if (!pde
|| IS_ERR(pde
))
241 * Request the irq line for the device.
243 static int dasd_state_known_to_basic(struct dasd_device
*device
)
245 struct dasd_block
*block
= device
->block
;
248 /* Allocate and register gendisk structure. */
250 rc
= dasd_gendisk_alloc(block
);
253 block
->debugfs_dentry
=
254 dasd_debugfs_setup(block
->gdp
->disk_name
,
255 dasd_debugfs_root_entry
);
256 dasd_profile_init(&block
->profile
, block
->debugfs_dentry
);
257 if (dasd_global_profile_level
== DASD_PROFILE_ON
)
258 dasd_profile_on(&device
->block
->profile
);
260 device
->debugfs_dentry
=
261 dasd_debugfs_setup(dev_name(&device
->cdev
->dev
),
262 dasd_debugfs_root_entry
);
263 dasd_profile_init(&device
->profile
, device
->debugfs_dentry
);
265 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
266 device
->debug_area
= debug_register(dev_name(&device
->cdev
->dev
), 4, 1,
268 debug_register_view(device
->debug_area
, &debug_sprintf_view
);
269 debug_set_level(device
->debug_area
, DBF_WARNING
);
270 DBF_DEV_EVENT(DBF_EMERG
, device
, "%s", "debug area created");
272 device
->state
= DASD_STATE_BASIC
;
278 * Release the irq line for the device. Terminate any running i/o.
280 static int dasd_state_basic_to_known(struct dasd_device
*device
)
285 dasd_profile_exit(&device
->block
->profile
);
286 if (device
->block
->debugfs_dentry
)
287 debugfs_remove(device
->block
->debugfs_dentry
);
288 dasd_gendisk_free(device
->block
);
289 dasd_block_clear_timer(device
->block
);
291 rc
= dasd_flush_device_queue(device
);
294 dasd_device_clear_timer(device
);
295 dasd_profile_exit(&device
->profile
);
296 if (device
->debugfs_dentry
)
297 debugfs_remove(device
->debugfs_dentry
);
299 DBF_DEV_EVENT(DBF_EMERG
, device
, "%p debug area deleted", device
);
300 if (device
->debug_area
!= NULL
) {
301 debug_unregister(device
->debug_area
);
302 device
->debug_area
= NULL
;
304 device
->state
= DASD_STATE_KNOWN
;
309 * Do the initial analysis. The do_analysis function may return
310 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
311 * until the discipline decides to continue the startup sequence
312 * by calling the function dasd_change_state. The eckd disciplines
313 * uses this to start a ccw that detects the format. The completion
314 * interrupt for this detection ccw uses the kernel event daemon to
315 * trigger the call to dasd_change_state. All this is done in the
316 * discipline code, see dasd_eckd.c.
317 * After the analysis ccw is done (do_analysis returned 0) the block
319 * In case the analysis returns an error, the device setup is stopped
320 * (a fake disk was already added to allow formatting).
322 static int dasd_state_basic_to_ready(struct dasd_device
*device
)
325 struct dasd_block
*block
;
328 block
= device
->block
;
329 /* make disk known with correct capacity */
331 if (block
->base
->discipline
->do_analysis
!= NULL
)
332 rc
= block
->base
->discipline
->do_analysis(block
);
335 device
->state
= DASD_STATE_UNFMT
;
340 dasd_setup_queue(block
);
341 set_capacity(block
->gdp
,
342 block
->blocks
<< block
->s2b_shift
);
343 device
->state
= DASD_STATE_READY
;
344 rc
= dasd_scan_partitions(block
);
346 device
->state
= DASD_STATE_BASIC
;
350 device
->state
= DASD_STATE_READY
;
353 if (device
->discipline
->basic_to_ready
)
354 rc
= device
->discipline
->basic_to_ready(device
);
359 int _wait_for_empty_queues(struct dasd_device
*device
)
362 return list_empty(&device
->ccw_queue
) &&
363 list_empty(&device
->block
->ccw_queue
);
365 return list_empty(&device
->ccw_queue
);
369 * Remove device from block device layer. Destroy dirty buffers.
370 * Forget format information. Check if the target level is basic
371 * and if it is create fake disk for formatting.
373 static int dasd_state_ready_to_basic(struct dasd_device
*device
)
377 if (device
->discipline
->ready_to_basic
) {
378 rc
= device
->discipline
->ready_to_basic(device
);
382 device
->state
= DASD_STATE_BASIC
;
384 struct dasd_block
*block
= device
->block
;
385 rc
= dasd_flush_block_queue(block
);
387 device
->state
= DASD_STATE_READY
;
390 dasd_flush_request_queue(block
);
391 dasd_destroy_partitions(block
);
394 block
->s2b_shift
= 0;
402 static int dasd_state_unfmt_to_basic(struct dasd_device
*device
)
404 device
->state
= DASD_STATE_BASIC
;
409 * Make the device online and schedule the bottom half to start
410 * the requeueing of requests from the linux request queue to the
414 dasd_state_ready_to_online(struct dasd_device
* device
)
416 struct gendisk
*disk
;
417 struct disk_part_iter piter
;
418 struct hd_struct
*part
;
420 device
->state
= DASD_STATE_ONLINE
;
422 dasd_schedule_block_bh(device
->block
);
423 if ((device
->features
& DASD_FEATURE_USERAW
)) {
424 disk
= device
->block
->gdp
;
425 kobject_uevent(&disk_to_dev(disk
)->kobj
, KOBJ_CHANGE
);
428 disk
= device
->block
->bdev
->bd_disk
;
429 disk_part_iter_init(&piter
, disk
, DISK_PITER_INCL_PART0
);
430 while ((part
= disk_part_iter_next(&piter
)))
431 kobject_uevent(&part_to_dev(part
)->kobj
, KOBJ_CHANGE
);
432 disk_part_iter_exit(&piter
);
438 * Stop the requeueing of requests again.
440 static int dasd_state_online_to_ready(struct dasd_device
*device
)
443 struct gendisk
*disk
;
444 struct disk_part_iter piter
;
445 struct hd_struct
*part
;
447 if (device
->discipline
->online_to_ready
) {
448 rc
= device
->discipline
->online_to_ready(device
);
453 device
->state
= DASD_STATE_READY
;
454 if (device
->block
&& !(device
->features
& DASD_FEATURE_USERAW
)) {
455 disk
= device
->block
->bdev
->bd_disk
;
456 disk_part_iter_init(&piter
, disk
, DISK_PITER_INCL_PART0
);
457 while ((part
= disk_part_iter_next(&piter
)))
458 kobject_uevent(&part_to_dev(part
)->kobj
, KOBJ_CHANGE
);
459 disk_part_iter_exit(&piter
);
465 * Device startup state changes.
467 static int dasd_increase_state(struct dasd_device
*device
)
472 if (device
->state
== DASD_STATE_NEW
&&
473 device
->target
>= DASD_STATE_KNOWN
)
474 rc
= dasd_state_new_to_known(device
);
477 device
->state
== DASD_STATE_KNOWN
&&
478 device
->target
>= DASD_STATE_BASIC
)
479 rc
= dasd_state_known_to_basic(device
);
482 device
->state
== DASD_STATE_BASIC
&&
483 device
->target
>= DASD_STATE_READY
)
484 rc
= dasd_state_basic_to_ready(device
);
487 device
->state
== DASD_STATE_UNFMT
&&
488 device
->target
> DASD_STATE_UNFMT
)
492 device
->state
== DASD_STATE_READY
&&
493 device
->target
>= DASD_STATE_ONLINE
)
494 rc
= dasd_state_ready_to_online(device
);
500 * Device shutdown state changes.
502 static int dasd_decrease_state(struct dasd_device
*device
)
507 if (device
->state
== DASD_STATE_ONLINE
&&
508 device
->target
<= DASD_STATE_READY
)
509 rc
= dasd_state_online_to_ready(device
);
512 device
->state
== DASD_STATE_READY
&&
513 device
->target
<= DASD_STATE_BASIC
)
514 rc
= dasd_state_ready_to_basic(device
);
517 device
->state
== DASD_STATE_UNFMT
&&
518 device
->target
<= DASD_STATE_BASIC
)
519 rc
= dasd_state_unfmt_to_basic(device
);
522 device
->state
== DASD_STATE_BASIC
&&
523 device
->target
<= DASD_STATE_KNOWN
)
524 rc
= dasd_state_basic_to_known(device
);
527 device
->state
== DASD_STATE_KNOWN
&&
528 device
->target
<= DASD_STATE_NEW
)
529 rc
= dasd_state_known_to_new(device
);
535 * This is the main startup/shutdown routine.
537 static void dasd_change_state(struct dasd_device
*device
)
541 if (device
->state
== device
->target
)
542 /* Already where we want to go today... */
544 if (device
->state
< device
->target
)
545 rc
= dasd_increase_state(device
);
547 rc
= dasd_decrease_state(device
);
551 device
->target
= device
->state
;
553 /* let user-space know that the device status changed */
554 kobject_uevent(&device
->cdev
->dev
.kobj
, KOBJ_CHANGE
);
556 if (device
->state
== device
->target
)
557 wake_up(&dasd_init_waitq
);
561 * Kick starter for devices that did not complete the startup/shutdown
562 * procedure or were sleeping because of a pending state.
563 * dasd_kick_device will schedule a call do do_kick_device to the kernel
566 static void do_kick_device(struct work_struct
*work
)
568 struct dasd_device
*device
= container_of(work
, struct dasd_device
, kick_work
);
569 mutex_lock(&device
->state_mutex
);
570 dasd_change_state(device
);
571 mutex_unlock(&device
->state_mutex
);
572 dasd_schedule_device_bh(device
);
573 dasd_put_device(device
);
576 void dasd_kick_device(struct dasd_device
*device
)
578 dasd_get_device(device
);
579 /* queue call to dasd_kick_device to the kernel event daemon. */
580 schedule_work(&device
->kick_work
);
584 * dasd_reload_device will schedule a call do do_reload_device to the kernel
587 static void do_reload_device(struct work_struct
*work
)
589 struct dasd_device
*device
= container_of(work
, struct dasd_device
,
591 device
->discipline
->reload(device
);
592 dasd_put_device(device
);
595 void dasd_reload_device(struct dasd_device
*device
)
597 dasd_get_device(device
);
598 /* queue call to dasd_reload_device to the kernel event daemon. */
599 schedule_work(&device
->reload_device
);
601 EXPORT_SYMBOL(dasd_reload_device
);
604 * dasd_restore_device will schedule a call do do_restore_device to the kernel
607 static void do_restore_device(struct work_struct
*work
)
609 struct dasd_device
*device
= container_of(work
, struct dasd_device
,
611 device
->cdev
->drv
->restore(device
->cdev
);
612 dasd_put_device(device
);
615 void dasd_restore_device(struct dasd_device
*device
)
617 dasd_get_device(device
);
618 /* queue call to dasd_restore_device to the kernel event daemon. */
619 schedule_work(&device
->restore_device
);
623 * Set the target state for a device and starts the state change.
625 void dasd_set_target_state(struct dasd_device
*device
, int target
)
627 dasd_get_device(device
);
628 mutex_lock(&device
->state_mutex
);
629 /* If we are in probeonly mode stop at DASD_STATE_READY. */
630 if (dasd_probeonly
&& target
> DASD_STATE_READY
)
631 target
= DASD_STATE_READY
;
632 if (device
->target
!= target
) {
633 if (device
->state
== target
)
634 wake_up(&dasd_init_waitq
);
635 device
->target
= target
;
637 if (device
->state
!= device
->target
)
638 dasd_change_state(device
);
639 mutex_unlock(&device
->state_mutex
);
640 dasd_put_device(device
);
644 * Enable devices with device numbers in [from..to].
646 static inline int _wait_for_device(struct dasd_device
*device
)
648 return (device
->state
== device
->target
);
651 void dasd_enable_device(struct dasd_device
*device
)
653 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
654 if (device
->state
<= DASD_STATE_KNOWN
)
655 /* No discipline for device found. */
656 dasd_set_target_state(device
, DASD_STATE_NEW
);
657 /* Now wait for the devices to come up. */
658 wait_event(dasd_init_waitq
, _wait_for_device(device
));
660 dasd_reload_device(device
);
661 if (device
->discipline
->kick_validate
)
662 device
->discipline
->kick_validate(device
);
666 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
669 unsigned int dasd_global_profile_level
= DASD_PROFILE_OFF
;
671 #ifdef CONFIG_DASD_PROFILE
672 struct dasd_profile_info dasd_global_profile_data
;
673 static struct dentry
*dasd_global_profile_dentry
;
674 static struct dentry
*dasd_debugfs_global_entry
;
677 * Add profiling information for cqr before execution.
679 static void dasd_profile_start(struct dasd_block
*block
,
680 struct dasd_ccw_req
*cqr
,
684 unsigned int counter
;
685 struct dasd_device
*device
;
687 /* count the length of the chanq for statistics */
689 if (dasd_global_profile_level
|| block
->profile
.data
)
690 list_for_each(l
, &block
->ccw_queue
)
694 if (dasd_global_profile_level
) {
695 dasd_global_profile_data
.dasd_io_nr_req
[counter
]++;
696 if (rq_data_dir(req
) == READ
)
697 dasd_global_profile_data
.dasd_read_nr_req
[counter
]++;
700 spin_lock(&block
->profile
.lock
);
701 if (block
->profile
.data
)
702 block
->profile
.data
->dasd_io_nr_req
[counter
]++;
703 if (rq_data_dir(req
) == READ
)
704 block
->profile
.data
->dasd_read_nr_req
[counter
]++;
705 spin_unlock(&block
->profile
.lock
);
708 * We count the request for the start device, even though it may run on
709 * some other device due to error recovery. This way we make sure that
710 * we count each request only once.
712 device
= cqr
->startdev
;
713 if (device
->profile
.data
) {
714 counter
= 1; /* request is not yet queued on the start device */
715 list_for_each(l
, &device
->ccw_queue
)
719 spin_lock(&device
->profile
.lock
);
720 if (device
->profile
.data
) {
721 device
->profile
.data
->dasd_io_nr_req
[counter
]++;
722 if (rq_data_dir(req
) == READ
)
723 device
->profile
.data
->dasd_read_nr_req
[counter
]++;
725 spin_unlock(&device
->profile
.lock
);
729 * Add profiling information for cqr after execution.
732 #define dasd_profile_counter(value, index) \
734 for (index = 0; index < 31 && value >> (2+index); index++) \
738 static void dasd_profile_end_add_data(struct dasd_profile_info
*data
,
751 /* in case of an overflow, reset the whole profile */
752 if (data
->dasd_io_reqs
== UINT_MAX
) {
753 memset(data
, 0, sizeof(*data
));
754 getnstimeofday(&data
->starttod
);
756 data
->dasd_io_reqs
++;
757 data
->dasd_io_sects
+= sectors
;
759 data
->dasd_io_alias
++;
763 data
->dasd_io_secs
[sectors_ind
]++;
764 data
->dasd_io_times
[tottime_ind
]++;
765 data
->dasd_io_timps
[tottimeps_ind
]++;
766 data
->dasd_io_time1
[strtime_ind
]++;
767 data
->dasd_io_time2
[irqtime_ind
]++;
768 data
->dasd_io_time2ps
[irqtimeps_ind
]++;
769 data
->dasd_io_time3
[endtime_ind
]++;
772 data
->dasd_read_reqs
++;
773 data
->dasd_read_sects
+= sectors
;
775 data
->dasd_read_alias
++;
777 data
->dasd_read_tpm
++;
778 data
->dasd_read_secs
[sectors_ind
]++;
779 data
->dasd_read_times
[tottime_ind
]++;
780 data
->dasd_read_time1
[strtime_ind
]++;
781 data
->dasd_read_time2
[irqtime_ind
]++;
782 data
->dasd_read_time3
[endtime_ind
]++;
786 static void dasd_profile_end(struct dasd_block
*block
,
787 struct dasd_ccw_req
*cqr
,
790 long strtime
, irqtime
, endtime
, tottime
; /* in microseconds */
791 long tottimeps
, sectors
;
792 struct dasd_device
*device
;
793 int sectors_ind
, tottime_ind
, tottimeps_ind
, strtime_ind
;
794 int irqtime_ind
, irqtimeps_ind
, endtime_ind
;
796 device
= cqr
->startdev
;
797 if (!(dasd_global_profile_level
||
798 block
->profile
.data
||
799 device
->profile
.data
))
802 sectors
= blk_rq_sectors(req
);
803 if (!cqr
->buildclk
|| !cqr
->startclk
||
804 !cqr
->stopclk
|| !cqr
->endclk
||
808 strtime
= ((cqr
->startclk
- cqr
->buildclk
) >> 12);
809 irqtime
= ((cqr
->stopclk
- cqr
->startclk
) >> 12);
810 endtime
= ((cqr
->endclk
- cqr
->stopclk
) >> 12);
811 tottime
= ((cqr
->endclk
- cqr
->buildclk
) >> 12);
812 tottimeps
= tottime
/ sectors
;
814 dasd_profile_counter(sectors
, sectors_ind
);
815 dasd_profile_counter(tottime
, tottime_ind
);
816 dasd_profile_counter(tottimeps
, tottimeps_ind
);
817 dasd_profile_counter(strtime
, strtime_ind
);
818 dasd_profile_counter(irqtime
, irqtime_ind
);
819 dasd_profile_counter(irqtime
/ sectors
, irqtimeps_ind
);
820 dasd_profile_counter(endtime
, endtime_ind
);
822 if (dasd_global_profile_level
) {
823 dasd_profile_end_add_data(&dasd_global_profile_data
,
824 cqr
->startdev
!= block
->base
,
826 rq_data_dir(req
) == READ
,
827 sectors
, sectors_ind
, tottime_ind
,
828 tottimeps_ind
, strtime_ind
,
829 irqtime_ind
, irqtimeps_ind
,
833 spin_lock(&block
->profile
.lock
);
834 if (block
->profile
.data
)
835 dasd_profile_end_add_data(block
->profile
.data
,
836 cqr
->startdev
!= block
->base
,
838 rq_data_dir(req
) == READ
,
839 sectors
, sectors_ind
, tottime_ind
,
840 tottimeps_ind
, strtime_ind
,
841 irqtime_ind
, irqtimeps_ind
,
843 spin_unlock(&block
->profile
.lock
);
845 spin_lock(&device
->profile
.lock
);
846 if (device
->profile
.data
)
847 dasd_profile_end_add_data(device
->profile
.data
,
848 cqr
->startdev
!= block
->base
,
850 rq_data_dir(req
) == READ
,
851 sectors
, sectors_ind
, tottime_ind
,
852 tottimeps_ind
, strtime_ind
,
853 irqtime_ind
, irqtimeps_ind
,
855 spin_unlock(&device
->profile
.lock
);
858 void dasd_profile_reset(struct dasd_profile
*profile
)
860 struct dasd_profile_info
*data
;
862 spin_lock_bh(&profile
->lock
);
863 data
= profile
->data
;
865 spin_unlock_bh(&profile
->lock
);
868 memset(data
, 0, sizeof(*data
));
869 getnstimeofday(&data
->starttod
);
870 spin_unlock_bh(&profile
->lock
);
873 void dasd_global_profile_reset(void)
875 memset(&dasd_global_profile_data
, 0, sizeof(dasd_global_profile_data
));
876 getnstimeofday(&dasd_global_profile_data
.starttod
);
879 int dasd_profile_on(struct dasd_profile
*profile
)
881 struct dasd_profile_info
*data
;
883 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
886 spin_lock_bh(&profile
->lock
);
888 spin_unlock_bh(&profile
->lock
);
892 getnstimeofday(&data
->starttod
);
893 profile
->data
= data
;
894 spin_unlock_bh(&profile
->lock
);
898 void dasd_profile_off(struct dasd_profile
*profile
)
900 spin_lock_bh(&profile
->lock
);
901 kfree(profile
->data
);
902 profile
->data
= NULL
;
903 spin_unlock_bh(&profile
->lock
);
906 char *dasd_get_user_string(const char __user
*user_buf
, size_t user_len
)
910 buffer
= vmalloc(user_len
+ 1);
912 return ERR_PTR(-ENOMEM
);
913 if (copy_from_user(buffer
, user_buf
, user_len
) != 0) {
915 return ERR_PTR(-EFAULT
);
917 /* got the string, now strip linefeed. */
918 if (buffer
[user_len
- 1] == '\n')
919 buffer
[user_len
- 1] = 0;
921 buffer
[user_len
] = 0;
925 static ssize_t
dasd_stats_write(struct file
*file
,
926 const char __user
*user_buf
,
927 size_t user_len
, loff_t
*pos
)
931 struct seq_file
*m
= (struct seq_file
*)file
->private_data
;
932 struct dasd_profile
*prof
= m
->private;
934 if (user_len
> 65536)
936 buffer
= dasd_get_user_string(user_buf
, user_len
);
938 return PTR_ERR(buffer
);
940 str
= skip_spaces(buffer
);
942 if (strncmp(str
, "reset", 5) == 0) {
943 dasd_profile_reset(prof
);
944 } else if (strncmp(str
, "on", 2) == 0) {
945 rc
= dasd_profile_on(prof
);
948 } else if (strncmp(str
, "off", 3) == 0) {
949 dasd_profile_off(prof
);
956 static void dasd_stats_array(struct seq_file
*m
, unsigned int *array
)
960 for (i
= 0; i
< 32; i
++)
961 seq_printf(m
, "%u ", array
[i
]);
965 static void dasd_stats_seq_print(struct seq_file
*m
,
966 struct dasd_profile_info
*data
)
968 seq_printf(m
, "start_time %ld.%09ld\n",
969 data
->starttod
.tv_sec
, data
->starttod
.tv_nsec
);
970 seq_printf(m
, "total_requests %u\n", data
->dasd_io_reqs
);
971 seq_printf(m
, "total_sectors %u\n", data
->dasd_io_sects
);
972 seq_printf(m
, "total_pav %u\n", data
->dasd_io_alias
);
973 seq_printf(m
, "total_hpf %u\n", data
->dasd_io_tpm
);
974 seq_printf(m
, "histogram_sectors ");
975 dasd_stats_array(m
, data
->dasd_io_secs
);
976 seq_printf(m
, "histogram_io_times ");
977 dasd_stats_array(m
, data
->dasd_io_times
);
978 seq_printf(m
, "histogram_io_times_weighted ");
979 dasd_stats_array(m
, data
->dasd_io_timps
);
980 seq_printf(m
, "histogram_time_build_to_ssch ");
981 dasd_stats_array(m
, data
->dasd_io_time1
);
982 seq_printf(m
, "histogram_time_ssch_to_irq ");
983 dasd_stats_array(m
, data
->dasd_io_time2
);
984 seq_printf(m
, "histogram_time_ssch_to_irq_weighted ");
985 dasd_stats_array(m
, data
->dasd_io_time2ps
);
986 seq_printf(m
, "histogram_time_irq_to_end ");
987 dasd_stats_array(m
, data
->dasd_io_time3
);
988 seq_printf(m
, "histogram_ccw_queue_length ");
989 dasd_stats_array(m
, data
->dasd_io_nr_req
);
990 seq_printf(m
, "total_read_requests %u\n", data
->dasd_read_reqs
);
991 seq_printf(m
, "total_read_sectors %u\n", data
->dasd_read_sects
);
992 seq_printf(m
, "total_read_pav %u\n", data
->dasd_read_alias
);
993 seq_printf(m
, "total_read_hpf %u\n", data
->dasd_read_tpm
);
994 seq_printf(m
, "histogram_read_sectors ");
995 dasd_stats_array(m
, data
->dasd_read_secs
);
996 seq_printf(m
, "histogram_read_times ");
997 dasd_stats_array(m
, data
->dasd_read_times
);
998 seq_printf(m
, "histogram_read_time_build_to_ssch ");
999 dasd_stats_array(m
, data
->dasd_read_time1
);
1000 seq_printf(m
, "histogram_read_time_ssch_to_irq ");
1001 dasd_stats_array(m
, data
->dasd_read_time2
);
1002 seq_printf(m
, "histogram_read_time_irq_to_end ");
1003 dasd_stats_array(m
, data
->dasd_read_time3
);
1004 seq_printf(m
, "histogram_read_ccw_queue_length ");
1005 dasd_stats_array(m
, data
->dasd_read_nr_req
);
1008 static int dasd_stats_show(struct seq_file
*m
, void *v
)
1010 struct dasd_profile
*profile
;
1011 struct dasd_profile_info
*data
;
1013 profile
= m
->private;
1014 spin_lock_bh(&profile
->lock
);
1015 data
= profile
->data
;
1017 spin_unlock_bh(&profile
->lock
);
1018 seq_printf(m
, "disabled\n");
1021 dasd_stats_seq_print(m
, data
);
1022 spin_unlock_bh(&profile
->lock
);
1026 static int dasd_stats_open(struct inode
*inode
, struct file
*file
)
1028 struct dasd_profile
*profile
= inode
->i_private
;
1029 return single_open(file
, dasd_stats_show
, profile
);
1032 static const struct file_operations dasd_stats_raw_fops
= {
1033 .owner
= THIS_MODULE
,
1034 .open
= dasd_stats_open
,
1036 .llseek
= seq_lseek
,
1037 .release
= single_release
,
1038 .write
= dasd_stats_write
,
1041 static ssize_t
dasd_stats_global_write(struct file
*file
,
1042 const char __user
*user_buf
,
1043 size_t user_len
, loff_t
*pos
)
1048 if (user_len
> 65536)
1050 buffer
= dasd_get_user_string(user_buf
, user_len
);
1052 return PTR_ERR(buffer
);
1053 str
= skip_spaces(buffer
);
1055 if (strncmp(str
, "reset", 5) == 0) {
1056 dasd_global_profile_reset();
1057 } else if (strncmp(str
, "on", 2) == 0) {
1058 dasd_global_profile_reset();
1059 dasd_global_profile_level
= DASD_PROFILE_GLOBAL_ONLY
;
1060 } else if (strncmp(str
, "off", 3) == 0) {
1061 dasd_global_profile_level
= DASD_PROFILE_OFF
;
1068 static int dasd_stats_global_show(struct seq_file
*m
, void *v
)
1070 if (!dasd_global_profile_level
) {
1071 seq_printf(m
, "disabled\n");
1074 dasd_stats_seq_print(m
, &dasd_global_profile_data
);
1078 static int dasd_stats_global_open(struct inode
*inode
, struct file
*file
)
1080 return single_open(file
, dasd_stats_global_show
, NULL
);
1083 static const struct file_operations dasd_stats_global_fops
= {
1084 .owner
= THIS_MODULE
,
1085 .open
= dasd_stats_global_open
,
1087 .llseek
= seq_lseek
,
1088 .release
= single_release
,
1089 .write
= dasd_stats_global_write
,
1092 static void dasd_profile_init(struct dasd_profile
*profile
,
1093 struct dentry
*base_dentry
)
1100 profile
->dentry
= NULL
;
1101 profile
->data
= NULL
;
1102 mode
= (S_IRUSR
| S_IWUSR
| S_IFREG
);
1103 pde
= debugfs_create_file("statistics", mode
, base_dentry
,
1104 profile
, &dasd_stats_raw_fops
);
1105 if (pde
&& !IS_ERR(pde
))
1106 profile
->dentry
= pde
;
1110 static void dasd_profile_exit(struct dasd_profile
*profile
)
1112 dasd_profile_off(profile
);
1113 if (profile
->dentry
) {
1114 debugfs_remove(profile
->dentry
);
1115 profile
->dentry
= NULL
;
1119 static void dasd_statistics_removeroot(void)
1121 dasd_global_profile_level
= DASD_PROFILE_OFF
;
1122 if (dasd_global_profile_dentry
) {
1123 debugfs_remove(dasd_global_profile_dentry
);
1124 dasd_global_profile_dentry
= NULL
;
1126 if (dasd_debugfs_global_entry
)
1127 debugfs_remove(dasd_debugfs_global_entry
);
1128 if (dasd_debugfs_root_entry
)
1129 debugfs_remove(dasd_debugfs_root_entry
);
1132 static void dasd_statistics_createroot(void)
1137 dasd_debugfs_root_entry
= NULL
;
1138 dasd_debugfs_global_entry
= NULL
;
1139 dasd_global_profile_dentry
= NULL
;
1140 pde
= debugfs_create_dir("dasd", NULL
);
1141 if (!pde
|| IS_ERR(pde
))
1143 dasd_debugfs_root_entry
= pde
;
1144 pde
= debugfs_create_dir("global", dasd_debugfs_root_entry
);
1145 if (!pde
|| IS_ERR(pde
))
1147 dasd_debugfs_global_entry
= pde
;
1149 mode
= (S_IRUSR
| S_IWUSR
| S_IFREG
);
1150 pde
= debugfs_create_file("statistics", mode
, dasd_debugfs_global_entry
,
1151 NULL
, &dasd_stats_global_fops
);
1152 if (!pde
|| IS_ERR(pde
))
1154 dasd_global_profile_dentry
= pde
;
1158 DBF_EVENT(DBF_ERR
, "%s",
1159 "Creation of the dasd debugfs interface failed");
1160 dasd_statistics_removeroot();
1165 #define dasd_profile_start(block, cqr, req) do {} while (0)
1166 #define dasd_profile_end(block, cqr, req) do {} while (0)
1168 static void dasd_statistics_createroot(void)
1173 static void dasd_statistics_removeroot(void)
1178 int dasd_stats_generic_show(struct seq_file
*m
, void *v
)
1180 seq_printf(m
, "Statistics are not activated in this kernel\n");
1184 static void dasd_profile_init(struct dasd_profile
*profile
,
1185 struct dentry
*base_dentry
)
1190 static void dasd_profile_exit(struct dasd_profile
*profile
)
1195 int dasd_profile_on(struct dasd_profile
*profile
)
1200 #endif /* CONFIG_DASD_PROFILE */
1203 * Allocate memory for a channel program with 'cplength' channel
1204 * command words and 'datasize' additional space. There are two
1205 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
1206 * memory and 2) dasd_smalloc_request uses the static ccw memory
1207 * that gets allocated for each device.
1209 struct dasd_ccw_req
*dasd_kmalloc_request(int magic
, int cplength
,
1211 struct dasd_device
*device
)
1213 struct dasd_ccw_req
*cqr
;
1216 BUG_ON(datasize
> PAGE_SIZE
||
1217 (cplength
*sizeof(struct ccw1
)) > PAGE_SIZE
);
1219 cqr
= kzalloc(sizeof(struct dasd_ccw_req
), GFP_ATOMIC
);
1221 return ERR_PTR(-ENOMEM
);
1224 cqr
->cpaddr
= kcalloc(cplength
, sizeof(struct ccw1
),
1225 GFP_ATOMIC
| GFP_DMA
);
1226 if (cqr
->cpaddr
== NULL
) {
1228 return ERR_PTR(-ENOMEM
);
1233 cqr
->data
= kzalloc(datasize
, GFP_ATOMIC
| GFP_DMA
);
1234 if (cqr
->data
== NULL
) {
1237 return ERR_PTR(-ENOMEM
);
1241 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
1242 dasd_get_device(device
);
1246 struct dasd_ccw_req
*dasd_smalloc_request(int magic
, int cplength
,
1248 struct dasd_device
*device
)
1250 unsigned long flags
;
1251 struct dasd_ccw_req
*cqr
;
1255 size
= (sizeof(struct dasd_ccw_req
) + 7L) & -8L;
1257 size
+= cplength
* sizeof(struct ccw1
);
1260 spin_lock_irqsave(&device
->mem_lock
, flags
);
1261 cqr
= (struct dasd_ccw_req
*)
1262 dasd_alloc_chunk(&device
->ccw_chunks
, size
);
1263 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
1265 return ERR_PTR(-ENOMEM
);
1266 memset(cqr
, 0, sizeof(struct dasd_ccw_req
));
1267 data
= (char *) cqr
+ ((sizeof(struct dasd_ccw_req
) + 7L) & -8L);
1270 cqr
->cpaddr
= (struct ccw1
*) data
;
1271 data
+= cplength
*sizeof(struct ccw1
);
1272 memset(cqr
->cpaddr
, 0, cplength
*sizeof(struct ccw1
));
1277 memset(cqr
->data
, 0, datasize
);
1280 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
1281 dasd_get_device(device
);
1286 * Free memory of a channel program. This function needs to free all the
1287 * idal lists that might have been created by dasd_set_cda and the
1288 * struct dasd_ccw_req itself.
1290 void dasd_kfree_request(struct dasd_ccw_req
*cqr
, struct dasd_device
*device
)
1295 /* Clear any idals used for the request. */
1298 clear_normalized_cda(ccw
);
1299 } while (ccw
++->flags
& (CCW_FLAG_CC
| CCW_FLAG_DC
));
1304 dasd_put_device(device
);
1307 void dasd_sfree_request(struct dasd_ccw_req
*cqr
, struct dasd_device
*device
)
1309 unsigned long flags
;
1311 spin_lock_irqsave(&device
->mem_lock
, flags
);
1312 dasd_free_chunk(&device
->ccw_chunks
, cqr
);
1313 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
1314 dasd_put_device(device
);
1318 * Check discipline magic in cqr.
1320 static inline int dasd_check_cqr(struct dasd_ccw_req
*cqr
)
1322 struct dasd_device
*device
;
1326 device
= cqr
->startdev
;
1327 if (strncmp((char *) &cqr
->magic
, device
->discipline
->ebcname
, 4)) {
1328 DBF_DEV_EVENT(DBF_WARNING
, device
,
1329 " dasd_ccw_req 0x%08x magic doesn't match"
1330 " discipline 0x%08x",
1332 *(unsigned int *) device
->discipline
->name
);
1339 * Terminate the current i/o and set the request to clear_pending.
1340 * Timer keeps device runnig.
1341 * ccw_device_clear can fail if the i/o subsystem
1344 int dasd_term_IO(struct dasd_ccw_req
*cqr
)
1346 struct dasd_device
*device
;
1348 char errorstring
[ERRORLENGTH
];
1351 rc
= dasd_check_cqr(cqr
);
1355 device
= (struct dasd_device
*) cqr
->startdev
;
1356 while ((retries
< 5) && (cqr
->status
== DASD_CQR_IN_IO
)) {
1357 rc
= ccw_device_clear(device
->cdev
, (long) cqr
);
1359 case 0: /* termination successful */
1360 cqr
->status
= DASD_CQR_CLEAR_PENDING
;
1361 cqr
->stopclk
= get_tod_clock();
1363 DBF_DEV_EVENT(DBF_DEBUG
, device
,
1364 "terminate cqr %p successful",
1368 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
1369 "device gone, retry");
1372 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
1373 "I/O error, retry");
1377 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
1378 "device busy, retry later");
1381 /* internal error 10 - unknown rc*/
1382 snprintf(errorstring
, ERRORLENGTH
, "10 %d", rc
);
1383 dev_err(&device
->cdev
->dev
, "An error occurred in the "
1384 "DASD device driver, reason=%s\n", errorstring
);
1390 dasd_schedule_device_bh(device
);
1395 * Start the i/o. This start_IO can fail if the channel is really busy.
1396 * In that case set up a timer to start the request later.
1398 int dasd_start_IO(struct dasd_ccw_req
*cqr
)
1400 struct dasd_device
*device
;
1402 char errorstring
[ERRORLENGTH
];
1405 rc
= dasd_check_cqr(cqr
);
1410 device
= (struct dasd_device
*) cqr
->startdev
;
1412 test_bit(DASD_FLAG_LOCK_STOLEN
, &cqr
->block
->base
->flags
)) ||
1413 test_bit(DASD_FLAG_LOCK_STOLEN
, &device
->flags
)) &&
1414 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
1415 DBF_DEV_EVENT(DBF_DEBUG
, device
, "start_IO: return request %p "
1416 "because of stolen lock", cqr
);
1417 cqr
->status
= DASD_CQR_ERROR
;
1418 cqr
->intrc
= -EPERM
;
1421 if (cqr
->retries
< 0) {
1422 /* internal error 14 - start_IO run out of retries */
1423 sprintf(errorstring
, "14 %p", cqr
);
1424 dev_err(&device
->cdev
->dev
, "An error occurred in the DASD "
1425 "device driver, reason=%s\n", errorstring
);
1426 cqr
->status
= DASD_CQR_ERROR
;
1429 cqr
->startclk
= get_tod_clock();
1430 cqr
->starttime
= jiffies
;
1432 if (!test_bit(DASD_CQR_VERIFY_PATH
, &cqr
->flags
)) {
1433 cqr
->lpm
&= device
->path_data
.opm
;
1435 cqr
->lpm
= device
->path_data
.opm
;
1437 if (cqr
->cpmode
== 1) {
1438 rc
= ccw_device_tm_start(device
->cdev
, cqr
->cpaddr
,
1439 (long) cqr
, cqr
->lpm
);
1441 rc
= ccw_device_start(device
->cdev
, cqr
->cpaddr
,
1442 (long) cqr
, cqr
->lpm
, 0);
1446 cqr
->status
= DASD_CQR_IN_IO
;
1449 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1450 "start_IO: device busy, retry later");
1453 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1454 "start_IO: request timeout, retry later");
1457 /* -EACCES indicates that the request used only a subset of the
1458 * available paths and all these paths are gone. If the lpm of
1459 * this request was only a subset of the opm (e.g. the ppm) then
1460 * we just do a retry with all available paths.
1461 * If we already use the full opm, something is amiss, and we
1462 * need a full path verification.
1464 if (test_bit(DASD_CQR_VERIFY_PATH
, &cqr
->flags
)) {
1465 DBF_DEV_EVENT(DBF_WARNING
, device
,
1466 "start_IO: selected paths gone (%x)",
1468 } else if (cqr
->lpm
!= device
->path_data
.opm
) {
1469 cqr
->lpm
= device
->path_data
.opm
;
1470 DBF_DEV_EVENT(DBF_DEBUG
, device
, "%s",
1471 "start_IO: selected paths gone,"
1472 " retry on all paths");
1474 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1475 "start_IO: all paths in opm gone,"
1476 " do path verification");
1477 dasd_generic_last_path_gone(device
);
1478 device
->path_data
.opm
= 0;
1479 device
->path_data
.ppm
= 0;
1480 device
->path_data
.npm
= 0;
1481 device
->path_data
.tbvpm
=
1482 ccw_device_get_path_mask(device
->cdev
);
1486 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1487 "start_IO: -ENODEV device gone, retry");
1490 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1491 "start_IO: -EIO device gone, retry");
1494 /* most likely caused in power management context */
1495 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1496 "start_IO: -EINVAL device currently "
1500 /* internal error 11 - unknown rc */
1501 snprintf(errorstring
, ERRORLENGTH
, "11 %d", rc
);
1502 dev_err(&device
->cdev
->dev
,
1503 "An error occurred in the DASD device driver, "
1504 "reason=%s\n", errorstring
);
1513 * Timeout function for dasd devices. This is used for different purposes
1514 * 1) missing interrupt handler for normal operation
1515 * 2) delayed start of request where start_IO failed with -EBUSY
1516 * 3) timeout for missing state change interrupts
1517 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
1518 * DASD_CQR_QUEUED for 2) and 3).
1520 static void dasd_device_timeout(unsigned long ptr
)
1522 unsigned long flags
;
1523 struct dasd_device
*device
;
1525 device
= (struct dasd_device
*) ptr
;
1526 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1527 /* re-activate request queue */
1528 dasd_device_remove_stop_bits(device
, DASD_STOPPED_PENDING
);
1529 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1530 dasd_schedule_device_bh(device
);
1534 * Setup timeout for a device in jiffies.
1536 void dasd_device_set_timer(struct dasd_device
*device
, int expires
)
1539 del_timer(&device
->timer
);
1541 mod_timer(&device
->timer
, jiffies
+ expires
);
1545 * Clear timeout for a device.
1547 void dasd_device_clear_timer(struct dasd_device
*device
)
1549 del_timer(&device
->timer
);
1552 static void dasd_handle_killed_request(struct ccw_device
*cdev
,
1553 unsigned long intparm
)
1555 struct dasd_ccw_req
*cqr
;
1556 struct dasd_device
*device
;
1560 cqr
= (struct dasd_ccw_req
*) intparm
;
1561 if (cqr
->status
!= DASD_CQR_IN_IO
) {
1562 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
,
1563 "invalid status in handle_killed_request: "
1564 "%02x", cqr
->status
);
1568 device
= dasd_device_from_cdev_locked(cdev
);
1569 if (IS_ERR(device
)) {
1570 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
, "%s",
1571 "unable to get device from cdev");
1575 if (!cqr
->startdev
||
1576 device
!= cqr
->startdev
||
1577 strncmp(cqr
->startdev
->discipline
->ebcname
,
1578 (char *) &cqr
->magic
, 4)) {
1579 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
, "%s",
1580 "invalid device in request");
1581 dasd_put_device(device
);
1585 /* Schedule request to be retried. */
1586 cqr
->status
= DASD_CQR_QUEUED
;
1588 dasd_device_clear_timer(device
);
1589 dasd_schedule_device_bh(device
);
1590 dasd_put_device(device
);
1593 void dasd_generic_handle_state_change(struct dasd_device
*device
)
1595 /* First of all start sense subsystem status request. */
1596 dasd_eer_snss(device
);
1598 dasd_device_remove_stop_bits(device
, DASD_STOPPED_PENDING
);
1599 dasd_schedule_device_bh(device
);
1601 dasd_schedule_block_bh(device
->block
);
1605 * Interrupt handler for "normal" ssch-io based dasd devices.
1607 void dasd_int_handler(struct ccw_device
*cdev
, unsigned long intparm
,
1610 struct dasd_ccw_req
*cqr
, *next
;
1611 struct dasd_device
*device
;
1612 unsigned long long now
;
1616 switch (PTR_ERR(irb
)) {
1620 DBF_EVENT_DEVID(DBF_WARNING
, cdev
, "%s: "
1621 "request timed out\n", __func__
);
1624 DBF_EVENT_DEVID(DBF_WARNING
, cdev
, "%s: "
1625 "unknown error %ld\n", __func__
,
1628 dasd_handle_killed_request(cdev
, intparm
);
1632 now
= get_tod_clock();
1633 cqr
= (struct dasd_ccw_req
*) intparm
;
1634 /* check for conditions that should be handled immediately */
1636 !(scsw_dstat(&irb
->scsw
) == (DEV_STAT_CHN_END
| DEV_STAT_DEV_END
) &&
1637 scsw_cstat(&irb
->scsw
) == 0)) {
1639 memcpy(&cqr
->irb
, irb
, sizeof(*irb
));
1640 device
= dasd_device_from_cdev_locked(cdev
);
1643 /* ignore unsolicited interrupts for DIAG discipline */
1644 if (device
->discipline
== dasd_diag_discipline_pointer
) {
1645 dasd_put_device(device
);
1648 device
->discipline
->dump_sense_dbf(device
, irb
, "int");
1649 if (device
->features
& DASD_FEATURE_ERPLOG
)
1650 device
->discipline
->dump_sense(device
, cqr
, irb
);
1651 device
->discipline
->check_for_device_change(device
, cqr
, irb
);
1652 dasd_put_device(device
);
1657 device
= (struct dasd_device
*) cqr
->startdev
;
1659 strncmp(device
->discipline
->ebcname
, (char *) &cqr
->magic
, 4)) {
1660 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
, "%s",
1661 "invalid device in request");
1665 /* Check for clear pending */
1666 if (cqr
->status
== DASD_CQR_CLEAR_PENDING
&&
1667 scsw_fctl(&irb
->scsw
) & SCSW_FCTL_CLEAR_FUNC
) {
1668 cqr
->status
= DASD_CQR_CLEARED
;
1669 dasd_device_clear_timer(device
);
1670 wake_up(&dasd_flush_wq
);
1671 dasd_schedule_device_bh(device
);
1675 /* check status - the request might have been killed by dyn detach */
1676 if (cqr
->status
!= DASD_CQR_IN_IO
) {
1677 DBF_DEV_EVENT(DBF_DEBUG
, device
, "invalid status: bus_id %s, "
1678 "status %02x", dev_name(&cdev
->dev
), cqr
->status
);
1684 if (scsw_dstat(&irb
->scsw
) == (DEV_STAT_CHN_END
| DEV_STAT_DEV_END
) &&
1685 scsw_cstat(&irb
->scsw
) == 0) {
1686 /* request was completed successfully */
1687 cqr
->status
= DASD_CQR_SUCCESS
;
1689 /* Start first request on queue if possible -> fast_io. */
1690 if (cqr
->devlist
.next
!= &device
->ccw_queue
) {
1691 next
= list_entry(cqr
->devlist
.next
,
1692 struct dasd_ccw_req
, devlist
);
1694 } else { /* error */
1696 * If we don't want complex ERP for this request, then just
1697 * reset this and retry it in the fastpath
1699 if (!test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
) &&
1701 if (cqr
->lpm
== device
->path_data
.opm
)
1702 DBF_DEV_EVENT(DBF_DEBUG
, device
,
1703 "default ERP in fastpath "
1704 "(%i retries left)",
1706 if (!test_bit(DASD_CQR_VERIFY_PATH
, &cqr
->flags
))
1707 cqr
->lpm
= device
->path_data
.opm
;
1708 cqr
->status
= DASD_CQR_QUEUED
;
1711 cqr
->status
= DASD_CQR_ERROR
;
1713 if (next
&& (next
->status
== DASD_CQR_QUEUED
) &&
1714 (!device
->stopped
)) {
1715 if (device
->discipline
->start_IO(next
) == 0)
1716 expires
= next
->expires
;
1719 dasd_device_set_timer(device
, expires
);
1721 dasd_device_clear_timer(device
);
1722 dasd_schedule_device_bh(device
);
1725 enum uc_todo
dasd_generic_uc_handler(struct ccw_device
*cdev
, struct irb
*irb
)
1727 struct dasd_device
*device
;
1729 device
= dasd_device_from_cdev_locked(cdev
);
1733 if (test_bit(DASD_FLAG_OFFLINE
, &device
->flags
) ||
1734 device
->state
!= device
->target
||
1735 !device
->discipline
->check_for_device_change
){
1736 dasd_put_device(device
);
1739 if (device
->discipline
->dump_sense_dbf
)
1740 device
->discipline
->dump_sense_dbf(device
, irb
, "uc");
1741 device
->discipline
->check_for_device_change(device
, NULL
, irb
);
1742 dasd_put_device(device
);
1744 return UC_TODO_RETRY
;
1746 EXPORT_SYMBOL_GPL(dasd_generic_uc_handler
);
1749 * If we have an error on a dasd_block layer request then we cancel
1750 * and return all further requests from the same dasd_block as well.
1752 static void __dasd_device_recovery(struct dasd_device
*device
,
1753 struct dasd_ccw_req
*ref_cqr
)
1755 struct list_head
*l
, *n
;
1756 struct dasd_ccw_req
*cqr
;
1759 * only requeue request that came from the dasd_block layer
1761 if (!ref_cqr
->block
)
1764 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1765 cqr
= list_entry(l
, struct dasd_ccw_req
, devlist
);
1766 if (cqr
->status
== DASD_CQR_QUEUED
&&
1767 ref_cqr
->block
== cqr
->block
) {
1768 cqr
->status
= DASD_CQR_CLEARED
;
1774 * Remove those ccw requests from the queue that need to be returned
1775 * to the upper layer.
1777 static void __dasd_device_process_ccw_queue(struct dasd_device
*device
,
1778 struct list_head
*final_queue
)
1780 struct list_head
*l
, *n
;
1781 struct dasd_ccw_req
*cqr
;
1783 /* Process request with final status. */
1784 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1785 cqr
= list_entry(l
, struct dasd_ccw_req
, devlist
);
1787 /* Skip any non-final request. */
1788 if (cqr
->status
== DASD_CQR_QUEUED
||
1789 cqr
->status
== DASD_CQR_IN_IO
||
1790 cqr
->status
== DASD_CQR_CLEAR_PENDING
)
1792 if (cqr
->status
== DASD_CQR_ERROR
) {
1793 __dasd_device_recovery(device
, cqr
);
1795 /* Rechain finished requests to final queue */
1796 list_move_tail(&cqr
->devlist
, final_queue
);
1801 * the cqrs from the final queue are returned to the upper layer
1802 * by setting a dasd_block state and calling the callback function
1804 static void __dasd_device_process_final_queue(struct dasd_device
*device
,
1805 struct list_head
*final_queue
)
1807 struct list_head
*l
, *n
;
1808 struct dasd_ccw_req
*cqr
;
1809 struct dasd_block
*block
;
1810 void (*callback
)(struct dasd_ccw_req
*, void *data
);
1811 void *callback_data
;
1812 char errorstring
[ERRORLENGTH
];
1814 list_for_each_safe(l
, n
, final_queue
) {
1815 cqr
= list_entry(l
, struct dasd_ccw_req
, devlist
);
1816 list_del_init(&cqr
->devlist
);
1818 callback
= cqr
->callback
;
1819 callback_data
= cqr
->callback_data
;
1821 spin_lock_bh(&block
->queue_lock
);
1822 switch (cqr
->status
) {
1823 case DASD_CQR_SUCCESS
:
1824 cqr
->status
= DASD_CQR_DONE
;
1826 case DASD_CQR_ERROR
:
1827 cqr
->status
= DASD_CQR_NEED_ERP
;
1829 case DASD_CQR_CLEARED
:
1830 cqr
->status
= DASD_CQR_TERMINATED
;
1833 /* internal error 12 - wrong cqr status*/
1834 snprintf(errorstring
, ERRORLENGTH
, "12 %p %x02", cqr
, cqr
->status
);
1835 dev_err(&device
->cdev
->dev
,
1836 "An error occurred in the DASD device driver, "
1837 "reason=%s\n", errorstring
);
1840 if (cqr
->callback
!= NULL
)
1841 (callback
)(cqr
, callback_data
);
1843 spin_unlock_bh(&block
->queue_lock
);
1848 * Take a look at the first request on the ccw queue and check
1849 * if it reached its expire time. If so, terminate the IO.
1851 static void __dasd_device_check_expire(struct dasd_device
*device
)
1853 struct dasd_ccw_req
*cqr
;
1855 if (list_empty(&device
->ccw_queue
))
1857 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, devlist
);
1858 if ((cqr
->status
== DASD_CQR_IN_IO
&& cqr
->expires
!= 0) &&
1859 (time_after_eq(jiffies
, cqr
->expires
+ cqr
->starttime
))) {
1860 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
1862 * IO in safe offline processing should not
1863 * run out of retries
1867 if (device
->discipline
->term_IO(cqr
) != 0) {
1868 /* Hmpf, try again in 5 sec */
1869 dev_err(&device
->cdev
->dev
,
1870 "cqr %p timed out (%lus) but cannot be "
1871 "ended, retrying in 5 s\n",
1872 cqr
, (cqr
->expires
/HZ
));
1873 cqr
->expires
+= 5*HZ
;
1874 dasd_device_set_timer(device
, 5*HZ
);
1876 dev_err(&device
->cdev
->dev
,
1877 "cqr %p timed out (%lus), %i retries "
1878 "remaining\n", cqr
, (cqr
->expires
/HZ
),
1885 * Take a look at the first request on the ccw queue and check
1886 * if it needs to be started.
1888 static void __dasd_device_start_head(struct dasd_device
*device
)
1890 struct dasd_ccw_req
*cqr
;
1893 if (list_empty(&device
->ccw_queue
))
1895 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, devlist
);
1896 if (cqr
->status
!= DASD_CQR_QUEUED
)
1898 /* when device is stopped, return request to previous layer
1899 * exception: only the disconnect or unresumed bits are set and the
1900 * cqr is a path verification request
1902 if (device
->stopped
&&
1903 !(!(device
->stopped
& ~(DASD_STOPPED_DC_WAIT
| DASD_UNRESUMED_PM
))
1904 && test_bit(DASD_CQR_VERIFY_PATH
, &cqr
->flags
))) {
1905 cqr
->intrc
= -EAGAIN
;
1906 cqr
->status
= DASD_CQR_CLEARED
;
1907 dasd_schedule_device_bh(device
);
1911 rc
= device
->discipline
->start_IO(cqr
);
1913 dasd_device_set_timer(device
, cqr
->expires
);
1914 else if (rc
== -EACCES
) {
1915 dasd_schedule_device_bh(device
);
1917 /* Hmpf, try again in 1/2 sec */
1918 dasd_device_set_timer(device
, 50);
1921 static void __dasd_device_check_path_events(struct dasd_device
*device
)
1925 if (device
->path_data
.tbvpm
) {
1926 if (device
->stopped
& ~(DASD_STOPPED_DC_WAIT
|
1929 rc
= device
->discipline
->verify_path(
1930 device
, device
->path_data
.tbvpm
);
1932 dasd_device_set_timer(device
, 50);
1934 device
->path_data
.tbvpm
= 0;
1939 * Go through all request on the dasd_device request queue,
1940 * terminate them on the cdev if necessary, and return them to the
1941 * submitting layer via callback.
1943 * Make sure that all 'submitting layers' still exist when
1944 * this function is called!. In other words, when 'device' is a base
1945 * device then all block layer requests must have been removed before
1946 * via dasd_flush_block_queue.
1948 int dasd_flush_device_queue(struct dasd_device
*device
)
1950 struct dasd_ccw_req
*cqr
, *n
;
1952 struct list_head flush_queue
;
1954 INIT_LIST_HEAD(&flush_queue
);
1955 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
1957 list_for_each_entry_safe(cqr
, n
, &device
->ccw_queue
, devlist
) {
1958 /* Check status and move request to flush_queue */
1959 switch (cqr
->status
) {
1960 case DASD_CQR_IN_IO
:
1961 rc
= device
->discipline
->term_IO(cqr
);
1963 /* unable to terminate requeust */
1964 dev_err(&device
->cdev
->dev
,
1965 "Flushing the DASD request queue "
1966 "failed for request %p\n", cqr
);
1967 /* stop flush processing */
1971 case DASD_CQR_QUEUED
:
1972 cqr
->stopclk
= get_tod_clock();
1973 cqr
->status
= DASD_CQR_CLEARED
;
1975 default: /* no need to modify the others */
1978 list_move_tail(&cqr
->devlist
, &flush_queue
);
1981 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
1983 * After this point all requests must be in state CLEAR_PENDING,
1984 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
1985 * one of the others.
1987 list_for_each_entry_safe(cqr
, n
, &flush_queue
, devlist
)
1988 wait_event(dasd_flush_wq
,
1989 (cqr
->status
!= DASD_CQR_CLEAR_PENDING
));
1991 * Now set each request back to TERMINATED, DONE or NEED_ERP
1992 * and call the callback function of flushed requests
1994 __dasd_device_process_final_queue(device
, &flush_queue
);
1999 * Acquire the device lock and process queues for the device.
2001 static void dasd_device_tasklet(struct dasd_device
*device
)
2003 struct list_head final_queue
;
2005 atomic_set (&device
->tasklet_scheduled
, 0);
2006 INIT_LIST_HEAD(&final_queue
);
2007 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
2008 /* Check expire time of first request on the ccw queue. */
2009 __dasd_device_check_expire(device
);
2010 /* find final requests on ccw queue */
2011 __dasd_device_process_ccw_queue(device
, &final_queue
);
2012 __dasd_device_check_path_events(device
);
2013 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2014 /* Now call the callback function of requests with final status */
2015 __dasd_device_process_final_queue(device
, &final_queue
);
2016 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
2017 /* Now check if the head of the ccw queue needs to be started. */
2018 __dasd_device_start_head(device
);
2019 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2020 if (waitqueue_active(&shutdown_waitq
))
2021 wake_up(&shutdown_waitq
);
2022 dasd_put_device(device
);
2026 * Schedules a call to dasd_tasklet over the device tasklet.
2028 void dasd_schedule_device_bh(struct dasd_device
*device
)
2030 /* Protect against rescheduling. */
2031 if (atomic_cmpxchg (&device
->tasklet_scheduled
, 0, 1) != 0)
2033 dasd_get_device(device
);
2034 tasklet_hi_schedule(&device
->tasklet
);
2037 void dasd_device_set_stop_bits(struct dasd_device
*device
, int bits
)
2039 device
->stopped
|= bits
;
2041 EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits
);
2043 void dasd_device_remove_stop_bits(struct dasd_device
*device
, int bits
)
2045 device
->stopped
&= ~bits
;
2046 if (!device
->stopped
)
2047 wake_up(&generic_waitq
);
2049 EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits
);
2052 * Queue a request to the head of the device ccw_queue.
2053 * Start the I/O if possible.
2055 void dasd_add_request_head(struct dasd_ccw_req
*cqr
)
2057 struct dasd_device
*device
;
2058 unsigned long flags
;
2060 device
= cqr
->startdev
;
2061 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
2062 cqr
->status
= DASD_CQR_QUEUED
;
2063 list_add(&cqr
->devlist
, &device
->ccw_queue
);
2064 /* let the bh start the request to keep them in order */
2065 dasd_schedule_device_bh(device
);
2066 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
2070 * Queue a request to the tail of the device ccw_queue.
2071 * Start the I/O if possible.
2073 void dasd_add_request_tail(struct dasd_ccw_req
*cqr
)
2075 struct dasd_device
*device
;
2076 unsigned long flags
;
2078 device
= cqr
->startdev
;
2079 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
2080 cqr
->status
= DASD_CQR_QUEUED
;
2081 list_add_tail(&cqr
->devlist
, &device
->ccw_queue
);
2082 /* let the bh start the request to keep them in order */
2083 dasd_schedule_device_bh(device
);
2084 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
2088 * Wakeup helper for the 'sleep_on' functions.
2090 void dasd_wakeup_cb(struct dasd_ccw_req
*cqr
, void *data
)
2092 spin_lock_irq(get_ccwdev_lock(cqr
->startdev
->cdev
));
2093 cqr
->callback_data
= DASD_SLEEPON_END_TAG
;
2094 spin_unlock_irq(get_ccwdev_lock(cqr
->startdev
->cdev
));
2095 wake_up(&generic_waitq
);
2097 EXPORT_SYMBOL_GPL(dasd_wakeup_cb
);
2099 static inline int _wait_for_wakeup(struct dasd_ccw_req
*cqr
)
2101 struct dasd_device
*device
;
2104 device
= cqr
->startdev
;
2105 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
2106 rc
= (cqr
->callback_data
== DASD_SLEEPON_END_TAG
);
2107 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2112 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
2114 static int __dasd_sleep_on_erp(struct dasd_ccw_req
*cqr
)
2116 struct dasd_device
*device
;
2117 dasd_erp_fn_t erp_fn
;
2119 if (cqr
->status
== DASD_CQR_FILLED
)
2121 device
= cqr
->startdev
;
2122 if (test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
)) {
2123 if (cqr
->status
== DASD_CQR_TERMINATED
) {
2124 device
->discipline
->handle_terminated_request(cqr
);
2127 if (cqr
->status
== DASD_CQR_NEED_ERP
) {
2128 erp_fn
= device
->discipline
->erp_action(cqr
);
2132 if (cqr
->status
== DASD_CQR_FAILED
)
2133 dasd_log_sense(cqr
, &cqr
->irb
);
2135 __dasd_process_erp(device
, cqr
);
2142 static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req
*cqr
)
2144 if (test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
)) {
2145 if (cqr
->refers
) /* erp is not done yet */
2147 return ((cqr
->status
!= DASD_CQR_DONE
) &&
2148 (cqr
->status
!= DASD_CQR_FAILED
));
2150 return (cqr
->status
== DASD_CQR_FILLED
);
2153 static int _dasd_sleep_on(struct dasd_ccw_req
*maincqr
, int interruptible
)
2155 struct dasd_device
*device
;
2157 struct list_head ccw_queue
;
2158 struct dasd_ccw_req
*cqr
;
2160 INIT_LIST_HEAD(&ccw_queue
);
2161 maincqr
->status
= DASD_CQR_FILLED
;
2162 device
= maincqr
->startdev
;
2163 list_add(&maincqr
->blocklist
, &ccw_queue
);
2164 for (cqr
= maincqr
; __dasd_sleep_on_loop_condition(cqr
);
2165 cqr
= list_first_entry(&ccw_queue
,
2166 struct dasd_ccw_req
, blocklist
)) {
2168 if (__dasd_sleep_on_erp(cqr
))
2170 if (cqr
->status
!= DASD_CQR_FILLED
) /* could be failed */
2172 if (test_bit(DASD_FLAG_LOCK_STOLEN
, &device
->flags
) &&
2173 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
2174 cqr
->status
= DASD_CQR_FAILED
;
2175 cqr
->intrc
= -EPERM
;
2178 /* Non-temporary stop condition will trigger fail fast */
2179 if (device
->stopped
& ~DASD_STOPPED_PENDING
&&
2180 test_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
) &&
2181 (!dasd_eer_enabled(device
))) {
2182 cqr
->status
= DASD_CQR_FAILED
;
2183 cqr
->intrc
= -ENOLINK
;
2186 /* Don't try to start requests if device is stopped */
2187 if (interruptible
) {
2188 rc
= wait_event_interruptible(
2189 generic_waitq
, !(device
->stopped
));
2190 if (rc
== -ERESTARTSYS
) {
2191 cqr
->status
= DASD_CQR_FAILED
;
2192 maincqr
->intrc
= rc
;
2196 wait_event(generic_waitq
, !(device
->stopped
));
2199 cqr
->callback
= dasd_wakeup_cb
;
2201 cqr
->callback_data
= DASD_SLEEPON_START_TAG
;
2202 dasd_add_request_tail(cqr
);
2203 if (interruptible
) {
2204 rc
= wait_event_interruptible(
2205 generic_waitq
, _wait_for_wakeup(cqr
));
2206 if (rc
== -ERESTARTSYS
) {
2207 dasd_cancel_req(cqr
);
2208 /* wait (non-interruptible) for final status */
2209 wait_event(generic_waitq
,
2210 _wait_for_wakeup(cqr
));
2211 cqr
->status
= DASD_CQR_FAILED
;
2212 maincqr
->intrc
= rc
;
2216 wait_event(generic_waitq
, _wait_for_wakeup(cqr
));
2219 maincqr
->endclk
= get_tod_clock();
2220 if ((maincqr
->status
!= DASD_CQR_DONE
) &&
2221 (maincqr
->intrc
!= -ERESTARTSYS
))
2222 dasd_log_sense(maincqr
, &maincqr
->irb
);
2223 if (maincqr
->status
== DASD_CQR_DONE
)
2225 else if (maincqr
->intrc
)
2226 rc
= maincqr
->intrc
;
2232 static inline int _wait_for_wakeup_queue(struct list_head
*ccw_queue
)
2234 struct dasd_ccw_req
*cqr
;
2236 list_for_each_entry(cqr
, ccw_queue
, blocklist
) {
2237 if (cqr
->callback_data
!= DASD_SLEEPON_END_TAG
)
2244 static int _dasd_sleep_on_queue(struct list_head
*ccw_queue
, int interruptible
)
2246 struct dasd_device
*device
;
2248 struct dasd_ccw_req
*cqr
, *n
;
2251 list_for_each_entry_safe(cqr
, n
, ccw_queue
, blocklist
) {
2252 device
= cqr
->startdev
;
2253 if (cqr
->status
!= DASD_CQR_FILLED
) /*could be failed*/
2256 if (test_bit(DASD_FLAG_LOCK_STOLEN
, &device
->flags
) &&
2257 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
2258 cqr
->status
= DASD_CQR_FAILED
;
2259 cqr
->intrc
= -EPERM
;
2262 /*Non-temporary stop condition will trigger fail fast*/
2263 if (device
->stopped
& ~DASD_STOPPED_PENDING
&&
2264 test_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
) &&
2265 !dasd_eer_enabled(device
)) {
2266 cqr
->status
= DASD_CQR_FAILED
;
2267 cqr
->intrc
= -EAGAIN
;
2271 /*Don't try to start requests if device is stopped*/
2272 if (interruptible
) {
2273 rc
= wait_event_interruptible(
2274 generic_waitq
, !device
->stopped
);
2275 if (rc
== -ERESTARTSYS
) {
2276 cqr
->status
= DASD_CQR_FAILED
;
2281 wait_event(generic_waitq
, !(device
->stopped
));
2284 cqr
->callback
= dasd_wakeup_cb
;
2285 cqr
->callback_data
= DASD_SLEEPON_START_TAG
;
2286 dasd_add_request_tail(cqr
);
2289 wait_event(generic_waitq
, _wait_for_wakeup_queue(ccw_queue
));
2292 list_for_each_entry_safe(cqr
, n
, ccw_queue
, blocklist
) {
2293 if (__dasd_sleep_on_erp(cqr
))
2304 * Queue a request to the tail of the device ccw_queue and wait for
2307 int dasd_sleep_on(struct dasd_ccw_req
*cqr
)
2309 return _dasd_sleep_on(cqr
, 0);
2313 * Start requests from a ccw_queue and wait for their completion.
2315 int dasd_sleep_on_queue(struct list_head
*ccw_queue
)
2317 return _dasd_sleep_on_queue(ccw_queue
, 0);
2319 EXPORT_SYMBOL(dasd_sleep_on_queue
);
2322 * Queue a request to the tail of the device ccw_queue and wait
2323 * interruptible for it's completion.
2325 int dasd_sleep_on_interruptible(struct dasd_ccw_req
*cqr
)
2327 return _dasd_sleep_on(cqr
, 1);
2331 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
2332 * for eckd devices) the currently running request has to be terminated
2333 * and be put back to status queued, before the special request is added
2334 * to the head of the queue. Then the special request is waited on normally.
2336 static inline int _dasd_term_running_cqr(struct dasd_device
*device
)
2338 struct dasd_ccw_req
*cqr
;
2341 if (list_empty(&device
->ccw_queue
))
2343 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, devlist
);
2344 rc
= device
->discipline
->term_IO(cqr
);
2347 * CQR terminated because a more important request is pending.
2348 * Undo decreasing of retry counter because this is
2349 * not an error case.
2355 int dasd_sleep_on_immediatly(struct dasd_ccw_req
*cqr
)
2357 struct dasd_device
*device
;
2360 device
= cqr
->startdev
;
2361 if (test_bit(DASD_FLAG_LOCK_STOLEN
, &device
->flags
) &&
2362 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
2363 cqr
->status
= DASD_CQR_FAILED
;
2364 cqr
->intrc
= -EPERM
;
2367 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
2368 rc
= _dasd_term_running_cqr(device
);
2370 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2373 cqr
->callback
= dasd_wakeup_cb
;
2374 cqr
->callback_data
= DASD_SLEEPON_START_TAG
;
2375 cqr
->status
= DASD_CQR_QUEUED
;
2377 * add new request as second
2378 * first the terminated cqr needs to be finished
2380 list_add(&cqr
->devlist
, device
->ccw_queue
.next
);
2382 /* let the bh start the request to keep them in order */
2383 dasd_schedule_device_bh(device
);
2385 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2387 wait_event(generic_waitq
, _wait_for_wakeup(cqr
));
2389 if (cqr
->status
== DASD_CQR_DONE
)
2391 else if (cqr
->intrc
)
2399 * Cancels a request that was started with dasd_sleep_on_req.
2400 * This is useful to timeout requests. The request will be
2401 * terminated if it is currently in i/o.
2402 * Returns 0 if request termination was successful
2403 * negative error code if termination failed
2404 * Cancellation of a request is an asynchronous operation! The calling
2405 * function has to wait until the request is properly returned via callback.
2407 int dasd_cancel_req(struct dasd_ccw_req
*cqr
)
2409 struct dasd_device
*device
= cqr
->startdev
;
2410 unsigned long flags
;
2414 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
2415 switch (cqr
->status
) {
2416 case DASD_CQR_QUEUED
:
2417 /* request was not started - just set to cleared */
2418 cqr
->status
= DASD_CQR_CLEARED
;
2420 case DASD_CQR_IN_IO
:
2421 /* request in IO - terminate IO and release again */
2422 rc
= device
->discipline
->term_IO(cqr
);
2424 dev_err(&device
->cdev
->dev
,
2425 "Cancelling request %p failed with rc=%d\n",
2428 cqr
->stopclk
= get_tod_clock();
2431 default: /* already finished or clear pending - do nothing */
2434 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
2435 dasd_schedule_device_bh(device
);
2440 * SECTION: Operations of the dasd_block layer.
2444 * Timeout function for dasd_block. This is used when the block layer
2445 * is waiting for something that may not come reliably, (e.g. a state
2448 static void dasd_block_timeout(unsigned long ptr
)
2450 unsigned long flags
;
2451 struct dasd_block
*block
;
2453 block
= (struct dasd_block
*) ptr
;
2454 spin_lock_irqsave(get_ccwdev_lock(block
->base
->cdev
), flags
);
2455 /* re-activate request queue */
2456 dasd_device_remove_stop_bits(block
->base
, DASD_STOPPED_PENDING
);
2457 spin_unlock_irqrestore(get_ccwdev_lock(block
->base
->cdev
), flags
);
2458 dasd_schedule_block_bh(block
);
2462 * Setup timeout for a dasd_block in jiffies.
2464 void dasd_block_set_timer(struct dasd_block
*block
, int expires
)
2467 del_timer(&block
->timer
);
2469 mod_timer(&block
->timer
, jiffies
+ expires
);
2473 * Clear timeout for a dasd_block.
2475 void dasd_block_clear_timer(struct dasd_block
*block
)
2477 del_timer(&block
->timer
);
2481 * Process finished error recovery ccw.
2483 static void __dasd_process_erp(struct dasd_device
*device
,
2484 struct dasd_ccw_req
*cqr
)
2486 dasd_erp_fn_t erp_fn
;
2488 if (cqr
->status
== DASD_CQR_DONE
)
2489 DBF_DEV_EVENT(DBF_NOTICE
, device
, "%s", "ERP successful");
2491 dev_err(&device
->cdev
->dev
, "ERP failed for the DASD\n");
2492 erp_fn
= device
->discipline
->erp_postaction(cqr
);
2497 * Fetch requests from the block device queue.
2499 static void __dasd_process_request_queue(struct dasd_block
*block
)
2501 struct request_queue
*queue
;
2502 struct request
*req
;
2503 struct dasd_ccw_req
*cqr
;
2504 struct dasd_device
*basedev
;
2505 unsigned long flags
;
2506 queue
= block
->request_queue
;
2507 basedev
= block
->base
;
2508 /* No queue ? Then there is nothing to do. */
2513 * We requeue request from the block device queue to the ccw
2514 * queue only in two states. In state DASD_STATE_READY the
2515 * partition detection is done and we need to requeue requests
2516 * for that. State DASD_STATE_ONLINE is normal block device
2519 if (basedev
->state
< DASD_STATE_READY
) {
2520 while ((req
= blk_fetch_request(block
->request_queue
)))
2521 __blk_end_request_all(req
, -EIO
);
2524 /* Now we try to fetch requests from the request queue */
2525 while ((req
= blk_peek_request(queue
))) {
2526 if (basedev
->features
& DASD_FEATURE_READONLY
&&
2527 rq_data_dir(req
) == WRITE
) {
2528 DBF_DEV_EVENT(DBF_ERR
, basedev
,
2529 "Rejecting write request %p",
2531 blk_start_request(req
);
2532 __blk_end_request_all(req
, -EIO
);
2535 if (test_bit(DASD_FLAG_ABORTALL
, &basedev
->flags
) &&
2536 (basedev
->features
& DASD_FEATURE_FAILFAST
||
2537 blk_noretry_request(req
))) {
2538 DBF_DEV_EVENT(DBF_ERR
, basedev
,
2539 "Rejecting failfast request %p",
2541 blk_start_request(req
);
2542 __blk_end_request_all(req
, -ETIMEDOUT
);
2545 cqr
= basedev
->discipline
->build_cp(basedev
, block
, req
);
2547 if (PTR_ERR(cqr
) == -EBUSY
)
2548 break; /* normal end condition */
2549 if (PTR_ERR(cqr
) == -ENOMEM
)
2550 break; /* terminate request queue loop */
2551 if (PTR_ERR(cqr
) == -EAGAIN
) {
2553 * The current request cannot be build right
2554 * now, we have to try later. If this request
2555 * is the head-of-queue we stop the device
2558 if (!list_empty(&block
->ccw_queue
))
2561 get_ccwdev_lock(basedev
->cdev
), flags
);
2562 dasd_device_set_stop_bits(basedev
,
2563 DASD_STOPPED_PENDING
);
2564 spin_unlock_irqrestore(
2565 get_ccwdev_lock(basedev
->cdev
), flags
);
2566 dasd_block_set_timer(block
, HZ
/2);
2569 DBF_DEV_EVENT(DBF_ERR
, basedev
,
2570 "CCW creation failed (rc=%ld) "
2573 blk_start_request(req
);
2574 __blk_end_request_all(req
, -EIO
);
2578 * Note: callback is set to dasd_return_cqr_cb in
2579 * __dasd_block_start_head to cover erp requests as well
2581 cqr
->callback_data
= (void *) req
;
2582 cqr
->status
= DASD_CQR_FILLED
;
2583 req
->completion_data
= cqr
;
2584 blk_start_request(req
);
2585 list_add_tail(&cqr
->blocklist
, &block
->ccw_queue
);
2586 INIT_LIST_HEAD(&cqr
->devlist
);
2587 dasd_profile_start(block
, cqr
, req
);
2591 static void __dasd_cleanup_cqr(struct dasd_ccw_req
*cqr
)
2593 struct request
*req
;
2597 req
= (struct request
*) cqr
->callback_data
;
2598 dasd_profile_end(cqr
->block
, cqr
, req
);
2599 status
= cqr
->block
->base
->discipline
->free_cp(cqr
, req
);
2602 else if (status
== 0) {
2603 if (cqr
->intrc
== -EPERM
)
2605 else if (cqr
->intrc
== -ENOLINK
||
2606 cqr
->intrc
== -ETIMEDOUT
)
2611 __blk_end_request_all(req
, error
);
2615 * Process ccw request queue.
2617 static void __dasd_process_block_ccw_queue(struct dasd_block
*block
,
2618 struct list_head
*final_queue
)
2620 struct list_head
*l
, *n
;
2621 struct dasd_ccw_req
*cqr
;
2622 dasd_erp_fn_t erp_fn
;
2623 unsigned long flags
;
2624 struct dasd_device
*base
= block
->base
;
2627 /* Process request with final status. */
2628 list_for_each_safe(l
, n
, &block
->ccw_queue
) {
2629 cqr
= list_entry(l
, struct dasd_ccw_req
, blocklist
);
2630 if (cqr
->status
!= DASD_CQR_DONE
&&
2631 cqr
->status
!= DASD_CQR_FAILED
&&
2632 cqr
->status
!= DASD_CQR_NEED_ERP
&&
2633 cqr
->status
!= DASD_CQR_TERMINATED
)
2636 if (cqr
->status
== DASD_CQR_TERMINATED
) {
2637 base
->discipline
->handle_terminated_request(cqr
);
2641 /* Process requests that may be recovered */
2642 if (cqr
->status
== DASD_CQR_NEED_ERP
) {
2643 erp_fn
= base
->discipline
->erp_action(cqr
);
2644 if (IS_ERR(erp_fn(cqr
)))
2649 /* log sense for fatal error */
2650 if (cqr
->status
== DASD_CQR_FAILED
) {
2651 dasd_log_sense(cqr
, &cqr
->irb
);
2654 /* First of all call extended error reporting. */
2655 if (dasd_eer_enabled(base
) &&
2656 cqr
->status
== DASD_CQR_FAILED
) {
2657 dasd_eer_write(base
, cqr
, DASD_EER_FATALERROR
);
2659 /* restart request */
2660 cqr
->status
= DASD_CQR_FILLED
;
2662 spin_lock_irqsave(get_ccwdev_lock(base
->cdev
), flags
);
2663 dasd_device_set_stop_bits(base
, DASD_STOPPED_QUIESCE
);
2664 spin_unlock_irqrestore(get_ccwdev_lock(base
->cdev
),
2669 /* Process finished ERP request. */
2671 __dasd_process_erp(base
, cqr
);
2675 /* Rechain finished requests to final queue */
2676 cqr
->endclk
= get_tod_clock();
2677 list_move_tail(&cqr
->blocklist
, final_queue
);
2681 static void dasd_return_cqr_cb(struct dasd_ccw_req
*cqr
, void *data
)
2683 dasd_schedule_block_bh(cqr
->block
);
2686 static void __dasd_block_start_head(struct dasd_block
*block
)
2688 struct dasd_ccw_req
*cqr
;
2690 if (list_empty(&block
->ccw_queue
))
2692 /* We allways begin with the first requests on the queue, as some
2693 * of previously started requests have to be enqueued on a
2694 * dasd_device again for error recovery.
2696 list_for_each_entry(cqr
, &block
->ccw_queue
, blocklist
) {
2697 if (cqr
->status
!= DASD_CQR_FILLED
)
2699 if (test_bit(DASD_FLAG_LOCK_STOLEN
, &block
->base
->flags
) &&
2700 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
2701 cqr
->status
= DASD_CQR_FAILED
;
2702 cqr
->intrc
= -EPERM
;
2703 dasd_schedule_block_bh(block
);
2706 /* Non-temporary stop condition will trigger fail fast */
2707 if (block
->base
->stopped
& ~DASD_STOPPED_PENDING
&&
2708 test_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
) &&
2709 (!dasd_eer_enabled(block
->base
))) {
2710 cqr
->status
= DASD_CQR_FAILED
;
2711 cqr
->intrc
= -ENOLINK
;
2712 dasd_schedule_block_bh(block
);
2715 /* Don't try to start requests if device is stopped */
2716 if (block
->base
->stopped
)
2719 /* just a fail safe check, should not happen */
2721 cqr
->startdev
= block
->base
;
2723 /* make sure that the requests we submit find their way back */
2724 cqr
->callback
= dasd_return_cqr_cb
;
2726 dasd_add_request_tail(cqr
);
2731 * Central dasd_block layer routine. Takes requests from the generic
2732 * block layer request queue, creates ccw requests, enqueues them on
2733 * a dasd_device and processes ccw requests that have been returned.
2735 static void dasd_block_tasklet(struct dasd_block
*block
)
2737 struct list_head final_queue
;
2738 struct list_head
*l
, *n
;
2739 struct dasd_ccw_req
*cqr
;
2741 atomic_set(&block
->tasklet_scheduled
, 0);
2742 INIT_LIST_HEAD(&final_queue
);
2743 spin_lock(&block
->queue_lock
);
2744 /* Finish off requests on ccw queue */
2745 __dasd_process_block_ccw_queue(block
, &final_queue
);
2746 spin_unlock(&block
->queue_lock
);
2747 /* Now call the callback function of requests with final status */
2748 spin_lock_irq(&block
->request_queue_lock
);
2749 list_for_each_safe(l
, n
, &final_queue
) {
2750 cqr
= list_entry(l
, struct dasd_ccw_req
, blocklist
);
2751 list_del_init(&cqr
->blocklist
);
2752 __dasd_cleanup_cqr(cqr
);
2754 spin_lock(&block
->queue_lock
);
2755 /* Get new request from the block device request queue */
2756 __dasd_process_request_queue(block
);
2757 /* Now check if the head of the ccw queue needs to be started. */
2758 __dasd_block_start_head(block
);
2759 spin_unlock(&block
->queue_lock
);
2760 spin_unlock_irq(&block
->request_queue_lock
);
2761 if (waitqueue_active(&shutdown_waitq
))
2762 wake_up(&shutdown_waitq
);
2763 dasd_put_device(block
->base
);
2766 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req
*cqr
, void *data
)
2768 wake_up(&dasd_flush_wq
);
2772 * Requeue a request back to the block request queue
2773 * only works for block requests
2775 static int _dasd_requeue_request(struct dasd_ccw_req
*cqr
)
2777 struct dasd_block
*block
= cqr
->block
;
2778 struct request
*req
;
2779 unsigned long flags
;
2783 spin_lock_irqsave(&block
->queue_lock
, flags
);
2784 req
= (struct request
*) cqr
->callback_data
;
2785 blk_requeue_request(block
->request_queue
, req
);
2786 spin_unlock_irqrestore(&block
->queue_lock
, flags
);
2792 * Go through all request on the dasd_block request queue, cancel them
2793 * on the respective dasd_device, and return them to the generic
2796 static int dasd_flush_block_queue(struct dasd_block
*block
)
2798 struct dasd_ccw_req
*cqr
, *n
;
2800 struct list_head flush_queue
;
2802 INIT_LIST_HEAD(&flush_queue
);
2803 spin_lock_bh(&block
->queue_lock
);
2806 list_for_each_entry_safe(cqr
, n
, &block
->ccw_queue
, blocklist
) {
2807 /* if this request currently owned by a dasd_device cancel it */
2808 if (cqr
->status
>= DASD_CQR_QUEUED
)
2809 rc
= dasd_cancel_req(cqr
);
2812 /* Rechain request (including erp chain) so it won't be
2813 * touched by the dasd_block_tasklet anymore.
2814 * Replace the callback so we notice when the request
2815 * is returned from the dasd_device layer.
2817 cqr
->callback
= _dasd_wake_block_flush_cb
;
2818 for (i
= 0; cqr
!= NULL
; cqr
= cqr
->refers
, i
++)
2819 list_move_tail(&cqr
->blocklist
, &flush_queue
);
2821 /* moved more than one request - need to restart */
2824 spin_unlock_bh(&block
->queue_lock
);
2825 /* Now call the callback function of flushed requests */
2827 list_for_each_entry_safe(cqr
, n
, &flush_queue
, blocklist
) {
2828 wait_event(dasd_flush_wq
, (cqr
->status
< DASD_CQR_QUEUED
));
2829 /* Process finished ERP request. */
2831 spin_lock_bh(&block
->queue_lock
);
2832 __dasd_process_erp(block
->base
, cqr
);
2833 spin_unlock_bh(&block
->queue_lock
);
2834 /* restart list_for_xx loop since dasd_process_erp
2835 * might remove multiple elements */
2838 /* call the callback function */
2839 spin_lock_irq(&block
->request_queue_lock
);
2840 cqr
->endclk
= get_tod_clock();
2841 list_del_init(&cqr
->blocklist
);
2842 __dasd_cleanup_cqr(cqr
);
2843 spin_unlock_irq(&block
->request_queue_lock
);
2849 * Schedules a call to dasd_tasklet over the device tasklet.
2851 void dasd_schedule_block_bh(struct dasd_block
*block
)
2853 /* Protect against rescheduling. */
2854 if (atomic_cmpxchg(&block
->tasklet_scheduled
, 0, 1) != 0)
2856 /* life cycle of block is bound to it's base device */
2857 dasd_get_device(block
->base
);
2858 tasklet_hi_schedule(&block
->tasklet
);
2863 * SECTION: external block device operations
2864 * (request queue handling, open, release, etc.)
2868 * Dasd request queue function. Called from ll_rw_blk.c
2870 static void do_dasd_request(struct request_queue
*queue
)
2872 struct dasd_block
*block
;
2874 block
= queue
->queuedata
;
2875 spin_lock(&block
->queue_lock
);
2876 /* Get new request from the block device request queue */
2877 __dasd_process_request_queue(block
);
2878 /* Now check if the head of the ccw queue needs to be started. */
2879 __dasd_block_start_head(block
);
2880 spin_unlock(&block
->queue_lock
);
2884 * Block timeout callback, called from the block layer
2886 * request_queue lock is held on entry.
2889 * BLK_EH_RESET_TIMER if the request should be left running
2890 * BLK_EH_NOT_HANDLED if the request is handled or terminated
2893 enum blk_eh_timer_return
dasd_times_out(struct request
*req
)
2895 struct dasd_ccw_req
*cqr
= req
->completion_data
;
2896 struct dasd_block
*block
= req
->q
->queuedata
;
2897 struct dasd_device
*device
;
2901 return BLK_EH_NOT_HANDLED
;
2903 device
= cqr
->startdev
? cqr
->startdev
: block
->base
;
2904 if (!device
->blk_timeout
)
2905 return BLK_EH_RESET_TIMER
;
2906 DBF_DEV_EVENT(DBF_WARNING
, device
,
2907 " dasd_times_out cqr %p status %x",
2910 spin_lock(&block
->queue_lock
);
2911 spin_lock(get_ccwdev_lock(device
->cdev
));
2913 cqr
->intrc
= -ETIMEDOUT
;
2914 if (cqr
->status
>= DASD_CQR_QUEUED
) {
2915 spin_unlock(get_ccwdev_lock(device
->cdev
));
2916 rc
= dasd_cancel_req(cqr
);
2917 } else if (cqr
->status
== DASD_CQR_FILLED
||
2918 cqr
->status
== DASD_CQR_NEED_ERP
) {
2919 cqr
->status
= DASD_CQR_TERMINATED
;
2920 spin_unlock(get_ccwdev_lock(device
->cdev
));
2921 } else if (cqr
->status
== DASD_CQR_IN_ERP
) {
2922 struct dasd_ccw_req
*searchcqr
, *nextcqr
, *tmpcqr
;
2924 list_for_each_entry_safe(searchcqr
, nextcqr
,
2925 &block
->ccw_queue
, blocklist
) {
2927 while (tmpcqr
->refers
)
2928 tmpcqr
= tmpcqr
->refers
;
2931 /* searchcqr is an ERP request for cqr */
2932 searchcqr
->retries
= -1;
2933 searchcqr
->intrc
= -ETIMEDOUT
;
2934 if (searchcqr
->status
>= DASD_CQR_QUEUED
) {
2935 spin_unlock(get_ccwdev_lock(device
->cdev
));
2936 rc
= dasd_cancel_req(searchcqr
);
2937 spin_lock(get_ccwdev_lock(device
->cdev
));
2938 } else if ((searchcqr
->status
== DASD_CQR_FILLED
) ||
2939 (searchcqr
->status
== DASD_CQR_NEED_ERP
)) {
2940 searchcqr
->status
= DASD_CQR_TERMINATED
;
2942 } else if (searchcqr
->status
== DASD_CQR_IN_ERP
) {
2944 * Shouldn't happen; most recent ERP
2945 * request is at the front of queue
2951 spin_unlock(get_ccwdev_lock(device
->cdev
));
2953 dasd_schedule_block_bh(block
);
2954 spin_unlock(&block
->queue_lock
);
2956 return rc
? BLK_EH_RESET_TIMER
: BLK_EH_NOT_HANDLED
;
2960 * Allocate and initialize request queue and default I/O scheduler.
2962 static int dasd_alloc_queue(struct dasd_block
*block
)
2966 block
->request_queue
= blk_init_queue(do_dasd_request
,
2967 &block
->request_queue_lock
);
2968 if (block
->request_queue
== NULL
)
2971 block
->request_queue
->queuedata
= block
;
2973 elevator_exit(block
->request_queue
->elevator
);
2974 block
->request_queue
->elevator
= NULL
;
2975 rc
= elevator_init(block
->request_queue
, "deadline");
2977 blk_cleanup_queue(block
->request_queue
);
2984 * Allocate and initialize request queue.
2986 static void dasd_setup_queue(struct dasd_block
*block
)
2990 if (block
->base
->features
& DASD_FEATURE_USERAW
) {
2992 * the max_blocks value for raw_track access is 256
2993 * it is higher than the native ECKD value because we
2994 * only need one ccw per track
2995 * so the max_hw_sectors are
2996 * 2048 x 512B = 1024kB = 16 tracks
3000 max
= block
->base
->discipline
->max_blocks
<< block
->s2b_shift
;
3002 blk_queue_logical_block_size(block
->request_queue
,
3004 blk_queue_max_hw_sectors(block
->request_queue
, max
);
3005 blk_queue_max_segments(block
->request_queue
, -1L);
3006 /* with page sized segments we can translate each segement into
3009 blk_queue_max_segment_size(block
->request_queue
, PAGE_SIZE
);
3010 blk_queue_segment_boundary(block
->request_queue
, PAGE_SIZE
- 1);
3014 * Deactivate and free request queue.
3016 static void dasd_free_queue(struct dasd_block
*block
)
3018 if (block
->request_queue
) {
3019 blk_cleanup_queue(block
->request_queue
);
3020 block
->request_queue
= NULL
;
3025 * Flush request on the request queue.
3027 static void dasd_flush_request_queue(struct dasd_block
*block
)
3029 struct request
*req
;
3031 if (!block
->request_queue
)
3034 spin_lock_irq(&block
->request_queue_lock
);
3035 while ((req
= blk_fetch_request(block
->request_queue
)))
3036 __blk_end_request_all(req
, -EIO
);
3037 spin_unlock_irq(&block
->request_queue_lock
);
3040 static int dasd_open(struct block_device
*bdev
, fmode_t mode
)
3042 struct dasd_device
*base
;
3045 base
= dasd_device_from_gendisk(bdev
->bd_disk
);
3049 atomic_inc(&base
->block
->open_count
);
3050 if (test_bit(DASD_FLAG_OFFLINE
, &base
->flags
)) {
3055 if (!try_module_get(base
->discipline
->owner
)) {
3060 if (dasd_probeonly
) {
3061 dev_info(&base
->cdev
->dev
,
3062 "Accessing the DASD failed because it is in "
3063 "probeonly mode\n");
3068 if (base
->state
<= DASD_STATE_BASIC
) {
3069 DBF_DEV_EVENT(DBF_ERR
, base
, " %s",
3070 " Cannot open unrecognized device");
3075 if ((mode
& FMODE_WRITE
) &&
3076 (test_bit(DASD_FLAG_DEVICE_RO
, &base
->flags
) ||
3077 (base
->features
& DASD_FEATURE_READONLY
))) {
3082 dasd_put_device(base
);
3086 module_put(base
->discipline
->owner
);
3088 atomic_dec(&base
->block
->open_count
);
3089 dasd_put_device(base
);
3093 static void dasd_release(struct gendisk
*disk
, fmode_t mode
)
3095 struct dasd_device
*base
= dasd_device_from_gendisk(disk
);
3097 atomic_dec(&base
->block
->open_count
);
3098 module_put(base
->discipline
->owner
);
3099 dasd_put_device(base
);
3104 * Return disk geometry.
3106 static int dasd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
3108 struct dasd_device
*base
;
3110 base
= dasd_device_from_gendisk(bdev
->bd_disk
);
3114 if (!base
->discipline
||
3115 !base
->discipline
->fill_geometry
) {
3116 dasd_put_device(base
);
3119 base
->discipline
->fill_geometry(base
->block
, geo
);
3120 geo
->start
= get_start_sect(bdev
) >> base
->block
->s2b_shift
;
3121 dasd_put_device(base
);
3125 const struct block_device_operations
3126 dasd_device_operations
= {
3127 .owner
= THIS_MODULE
,
3129 .release
= dasd_release
,
3130 .ioctl
= dasd_ioctl
,
3131 .compat_ioctl
= dasd_ioctl
,
3132 .getgeo
= dasd_getgeo
,
3135 /*******************************************************************************
3136 * end of block device operations
3142 #ifdef CONFIG_PROC_FS
3146 if (dasd_page_cache
!= NULL
) {
3147 kmem_cache_destroy(dasd_page_cache
);
3148 dasd_page_cache
= NULL
;
3150 dasd_gendisk_exit();
3152 if (dasd_debug_area
!= NULL
) {
3153 debug_unregister(dasd_debug_area
);
3154 dasd_debug_area
= NULL
;
3156 dasd_statistics_removeroot();
3160 * SECTION: common functions for ccw_driver use
3164 * Is the device read-only?
3165 * Note that this function does not report the setting of the
3166 * readonly device attribute, but how it is configured in z/VM.
3168 int dasd_device_is_ro(struct dasd_device
*device
)
3170 struct ccw_dev_id dev_id
;
3171 struct diag210 diag_data
;
3176 ccw_device_get_id(device
->cdev
, &dev_id
);
3177 memset(&diag_data
, 0, sizeof(diag_data
));
3178 diag_data
.vrdcdvno
= dev_id
.devno
;
3179 diag_data
.vrdclen
= sizeof(diag_data
);
3180 rc
= diag210(&diag_data
);
3181 if (rc
== 0 || rc
== 2) {
3182 return diag_data
.vrdcvfla
& 0x80;
3184 DBF_EVENT(DBF_WARNING
, "diag210 failed for dev=%04x with rc=%d",
3189 EXPORT_SYMBOL_GPL(dasd_device_is_ro
);
3191 static void dasd_generic_auto_online(void *data
, async_cookie_t cookie
)
3193 struct ccw_device
*cdev
= data
;
3196 ret
= ccw_device_set_online(cdev
);
3198 pr_warning("%s: Setting the DASD online failed with rc=%d\n",
3199 dev_name(&cdev
->dev
), ret
);
3203 * Initial attempt at a probe function. this can be simplified once
3204 * the other detection code is gone.
3206 int dasd_generic_probe(struct ccw_device
*cdev
,
3207 struct dasd_discipline
*discipline
)
3211 ret
= dasd_add_sysfs_files(cdev
);
3213 DBF_EVENT_DEVID(DBF_WARNING
, cdev
, "%s",
3214 "dasd_generic_probe: could not add "
3218 cdev
->handler
= &dasd_int_handler
;
3221 * Automatically online either all dasd devices (dasd_autodetect)
3222 * or all devices specified with dasd= parameters during
3225 if ((dasd_get_feature(cdev
, DASD_FEATURE_INITIAL_ONLINE
) > 0 ) ||
3226 (dasd_autodetect
&& dasd_busid_known(dev_name(&cdev
->dev
)) != 0))
3227 async_schedule(dasd_generic_auto_online
, cdev
);
3232 * This will one day be called from a global not_oper handler.
3233 * It is also used by driver_unregister during module unload.
3235 void dasd_generic_remove(struct ccw_device
*cdev
)
3237 struct dasd_device
*device
;
3238 struct dasd_block
*block
;
3240 cdev
->handler
= NULL
;
3242 device
= dasd_device_from_cdev(cdev
);
3243 if (IS_ERR(device
)) {
3244 dasd_remove_sysfs_files(cdev
);
3247 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
) &&
3248 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
3249 /* Already doing offline processing */
3250 dasd_put_device(device
);
3251 dasd_remove_sysfs_files(cdev
);
3255 * This device is removed unconditionally. Set offline
3256 * flag to prevent dasd_open from opening it while it is
3257 * no quite down yet.
3259 dasd_set_target_state(device
, DASD_STATE_NEW
);
3260 /* dasd_delete_device destroys the device reference. */
3261 block
= device
->block
;
3262 dasd_delete_device(device
);
3264 * life cycle of block is bound to device, so delete it after
3265 * device was safely removed
3268 dasd_free_block(block
);
3270 dasd_remove_sysfs_files(cdev
);
3274 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
3275 * the device is detected for the first time and is supposed to be used
3276 * or the user has started activation through sysfs.
3278 int dasd_generic_set_online(struct ccw_device
*cdev
,
3279 struct dasd_discipline
*base_discipline
)
3281 struct dasd_discipline
*discipline
;
3282 struct dasd_device
*device
;
3285 /* first online clears initial online feature flag */
3286 dasd_set_feature(cdev
, DASD_FEATURE_INITIAL_ONLINE
, 0);
3287 device
= dasd_create_device(cdev
);
3289 return PTR_ERR(device
);
3291 discipline
= base_discipline
;
3292 if (device
->features
& DASD_FEATURE_USEDIAG
) {
3293 if (!dasd_diag_discipline_pointer
) {
3294 pr_warning("%s Setting the DASD online failed because "
3295 "of missing DIAG discipline\n",
3296 dev_name(&cdev
->dev
));
3297 dasd_delete_device(device
);
3300 discipline
= dasd_diag_discipline_pointer
;
3302 if (!try_module_get(base_discipline
->owner
)) {
3303 dasd_delete_device(device
);
3306 if (!try_module_get(discipline
->owner
)) {
3307 module_put(base_discipline
->owner
);
3308 dasd_delete_device(device
);
3311 device
->base_discipline
= base_discipline
;
3312 device
->discipline
= discipline
;
3314 /* check_device will allocate block device if necessary */
3315 rc
= discipline
->check_device(device
);
3317 pr_warning("%s Setting the DASD online with discipline %s "
3318 "failed with rc=%i\n",
3319 dev_name(&cdev
->dev
), discipline
->name
, rc
);
3320 module_put(discipline
->owner
);
3321 module_put(base_discipline
->owner
);
3322 dasd_delete_device(device
);
3326 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
3327 if (device
->state
<= DASD_STATE_KNOWN
) {
3328 pr_warning("%s Setting the DASD online failed because of a "
3329 "missing discipline\n", dev_name(&cdev
->dev
));
3331 dasd_set_target_state(device
, DASD_STATE_NEW
);
3333 dasd_free_block(device
->block
);
3334 dasd_delete_device(device
);
3336 pr_debug("dasd_generic device %s found\n",
3337 dev_name(&cdev
->dev
));
3339 wait_event(dasd_init_waitq
, _wait_for_device(device
));
3341 dasd_put_device(device
);
3345 int dasd_generic_set_offline(struct ccw_device
*cdev
)
3347 struct dasd_device
*device
;
3348 struct dasd_block
*block
;
3349 int max_count
, open_count
, rc
;
3352 device
= dasd_device_from_cdev(cdev
);
3354 return PTR_ERR(device
);
3357 * We must make sure that this device is currently not in use.
3358 * The open_count is increased for every opener, that includes
3359 * the blkdev_get in dasd_scan_partitions. We are only interested
3360 * in the other openers.
3362 if (device
->block
) {
3363 max_count
= device
->block
->bdev
? 0 : -1;
3364 open_count
= atomic_read(&device
->block
->open_count
);
3365 if (open_count
> max_count
) {
3367 pr_warning("%s: The DASD cannot be set offline "
3368 "with open count %i\n",
3369 dev_name(&cdev
->dev
), open_count
);
3371 pr_warning("%s: The DASD cannot be set offline "
3372 "while it is in use\n",
3373 dev_name(&cdev
->dev
));
3374 clear_bit(DASD_FLAG_OFFLINE
, &device
->flags
);
3375 dasd_put_device(device
);
3380 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
3382 * safe offline allready running
3383 * could only be called by normal offline so safe_offline flag
3384 * needs to be removed to run normal offline and kill all I/O
3386 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
3387 /* Already doing normal offline processing */
3388 dasd_put_device(device
);
3391 clear_bit(DASD_FLAG_SAFE_OFFLINE
, &device
->flags
);
3394 if (test_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
3395 /* Already doing offline processing */
3396 dasd_put_device(device
);
3401 * if safe_offline called set safe_offline_running flag and
3402 * clear safe_offline so that a call to normal offline
3403 * can overrun safe_offline processing
3405 if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE
, &device
->flags
) &&
3406 !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
3408 * If we want to set the device safe offline all IO operations
3409 * should be finished before continuing the offline process
3410 * so sync bdev first and then wait for our queues to become
3413 /* sync blockdev and partitions */
3414 rc
= fsync_bdev(device
->block
->bdev
);
3418 /* schedule device tasklet and wait for completion */
3419 dasd_schedule_device_bh(device
);
3420 rc
= wait_event_interruptible(shutdown_waitq
,
3421 _wait_for_empty_queues(device
));
3426 set_bit(DASD_FLAG_OFFLINE
, &device
->flags
);
3427 dasd_set_target_state(device
, DASD_STATE_NEW
);
3428 /* dasd_delete_device destroys the device reference. */
3429 block
= device
->block
;
3430 dasd_delete_device(device
);
3432 * life cycle of block is bound to device, so delete it after
3433 * device was safely removed
3436 dasd_free_block(block
);
3440 /* interrupted by signal */
3441 clear_bit(DASD_FLAG_SAFE_OFFLINE
, &device
->flags
);
3442 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
);
3443 clear_bit(DASD_FLAG_OFFLINE
, &device
->flags
);
3444 dasd_put_device(device
);
3448 int dasd_generic_last_path_gone(struct dasd_device
*device
)
3450 struct dasd_ccw_req
*cqr
;
3452 dev_warn(&device
->cdev
->dev
, "No operational channel path is left "
3453 "for the device\n");
3454 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s", "last path gone");
3455 /* First of all call extended error reporting. */
3456 dasd_eer_write(device
, NULL
, DASD_EER_NOPATH
);
3458 if (device
->state
< DASD_STATE_BASIC
)
3460 /* Device is active. We want to keep it. */
3461 list_for_each_entry(cqr
, &device
->ccw_queue
, devlist
)
3462 if ((cqr
->status
== DASD_CQR_IN_IO
) ||
3463 (cqr
->status
== DASD_CQR_CLEAR_PENDING
)) {
3464 cqr
->status
= DASD_CQR_QUEUED
;
3467 dasd_device_set_stop_bits(device
, DASD_STOPPED_DC_WAIT
);
3468 dasd_device_clear_timer(device
);
3469 dasd_schedule_device_bh(device
);
3472 EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone
);
3474 int dasd_generic_path_operational(struct dasd_device
*device
)
3476 dev_info(&device
->cdev
->dev
, "A channel path to the device has become "
3478 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s", "path operational");
3479 dasd_device_remove_stop_bits(device
, DASD_STOPPED_DC_WAIT
);
3480 if (device
->stopped
& DASD_UNRESUMED_PM
) {
3481 dasd_device_remove_stop_bits(device
, DASD_UNRESUMED_PM
);
3482 dasd_restore_device(device
);
3485 dasd_schedule_device_bh(device
);
3487 dasd_schedule_block_bh(device
->block
);
3490 EXPORT_SYMBOL_GPL(dasd_generic_path_operational
);
3492 int dasd_generic_notify(struct ccw_device
*cdev
, int event
)
3494 struct dasd_device
*device
;
3497 device
= dasd_device_from_cdev_locked(cdev
);
3505 device
->path_data
.opm
= 0;
3506 device
->path_data
.ppm
= 0;
3507 device
->path_data
.npm
= 0;
3508 ret
= dasd_generic_last_path_gone(device
);
3512 if (device
->path_data
.opm
)
3513 ret
= dasd_generic_path_operational(device
);
3516 dasd_put_device(device
);
3520 void dasd_generic_path_event(struct ccw_device
*cdev
, int *path_event
)
3523 __u8 oldopm
, eventlpm
;
3524 struct dasd_device
*device
;
3526 device
= dasd_device_from_cdev_locked(cdev
);
3529 for (chp
= 0; chp
< 8; chp
++) {
3530 eventlpm
= 0x80 >> chp
;
3531 if (path_event
[chp
] & PE_PATH_GONE
) {
3532 oldopm
= device
->path_data
.opm
;
3533 device
->path_data
.opm
&= ~eventlpm
;
3534 device
->path_data
.ppm
&= ~eventlpm
;
3535 device
->path_data
.npm
&= ~eventlpm
;
3536 if (oldopm
&& !device
->path_data
.opm
) {
3537 dev_warn(&device
->cdev
->dev
,
3538 "No verified channel paths remain "
3539 "for the device\n");
3540 DBF_DEV_EVENT(DBF_WARNING
, device
,
3541 "%s", "last verified path gone");
3542 dasd_eer_write(device
, NULL
, DASD_EER_NOPATH
);
3543 dasd_device_set_stop_bits(device
,
3544 DASD_STOPPED_DC_WAIT
);
3547 if (path_event
[chp
] & PE_PATH_AVAILABLE
) {
3548 device
->path_data
.opm
&= ~eventlpm
;
3549 device
->path_data
.ppm
&= ~eventlpm
;
3550 device
->path_data
.npm
&= ~eventlpm
;
3551 device
->path_data
.tbvpm
|= eventlpm
;
3552 dasd_schedule_device_bh(device
);
3554 if (path_event
[chp
] & PE_PATHGROUP_ESTABLISHED
) {
3555 if (!(device
->path_data
.opm
& eventlpm
) &&
3556 !(device
->path_data
.tbvpm
& eventlpm
)) {
3558 * we can not establish a pathgroup on an
3559 * unavailable path, so trigger a path
3560 * verification first
3562 device
->path_data
.tbvpm
|= eventlpm
;
3563 dasd_schedule_device_bh(device
);
3565 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
3566 "Pathgroup re-established\n");
3567 if (device
->discipline
->kick_validate
)
3568 device
->discipline
->kick_validate(device
);
3571 dasd_put_device(device
);
3573 EXPORT_SYMBOL_GPL(dasd_generic_path_event
);
3575 int dasd_generic_verify_path(struct dasd_device
*device
, __u8 lpm
)
3577 if (!device
->path_data
.opm
&& lpm
) {
3578 device
->path_data
.opm
= lpm
;
3579 dasd_generic_path_operational(device
);
3581 device
->path_data
.opm
|= lpm
;
3584 EXPORT_SYMBOL_GPL(dasd_generic_verify_path
);
3587 int dasd_generic_pm_freeze(struct ccw_device
*cdev
)
3589 struct dasd_device
*device
= dasd_device_from_cdev(cdev
);
3590 struct list_head freeze_queue
;
3591 struct dasd_ccw_req
*cqr
, *n
;
3592 struct dasd_ccw_req
*refers
;
3596 return PTR_ERR(device
);
3598 /* mark device as suspended */
3599 set_bit(DASD_FLAG_SUSPENDED
, &device
->flags
);
3601 if (device
->discipline
->freeze
)
3602 rc
= device
->discipline
->freeze(device
);
3604 /* disallow new I/O */
3605 dasd_device_set_stop_bits(device
, DASD_STOPPED_PM
);
3607 /* clear active requests and requeue them to block layer if possible */
3608 INIT_LIST_HEAD(&freeze_queue
);
3609 spin_lock_irq(get_ccwdev_lock(cdev
));
3611 list_for_each_entry_safe(cqr
, n
, &device
->ccw_queue
, devlist
) {
3612 /* Check status and move request to flush_queue */
3613 if (cqr
->status
== DASD_CQR_IN_IO
) {
3614 rc
= device
->discipline
->term_IO(cqr
);
3616 /* unable to terminate requeust */
3617 dev_err(&device
->cdev
->dev
,
3618 "Unable to terminate request %p "
3619 "on suspend\n", cqr
);
3620 spin_unlock_irq(get_ccwdev_lock(cdev
));
3621 dasd_put_device(device
);
3625 list_move_tail(&cqr
->devlist
, &freeze_queue
);
3627 spin_unlock_irq(get_ccwdev_lock(cdev
));
3629 list_for_each_entry_safe(cqr
, n
, &freeze_queue
, devlist
) {
3630 wait_event(dasd_flush_wq
,
3631 (cqr
->status
!= DASD_CQR_CLEAR_PENDING
));
3632 if (cqr
->status
== DASD_CQR_CLEARED
)
3633 cqr
->status
= DASD_CQR_QUEUED
;
3635 /* requeue requests to blocklayer will only work for
3636 block device requests */
3637 if (_dasd_requeue_request(cqr
))
3640 /* remove requests from device and block queue */
3641 list_del_init(&cqr
->devlist
);
3642 while (cqr
->refers
!= NULL
) {
3643 refers
= cqr
->refers
;
3644 /* remove the request from the block queue */
3645 list_del(&cqr
->blocklist
);
3646 /* free the finished erp request */
3647 dasd_free_erp_request(cqr
, cqr
->memdev
);
3651 list_del_init(&cqr
->blocklist
);
3652 cqr
->block
->base
->discipline
->free_cp(
3653 cqr
, (struct request
*) cqr
->callback_data
);
3657 * if requests remain then they are internal request
3658 * and go back to the device queue
3660 if (!list_empty(&freeze_queue
)) {
3661 /* move freeze_queue to start of the ccw_queue */
3662 spin_lock_irq(get_ccwdev_lock(cdev
));
3663 list_splice_tail(&freeze_queue
, &device
->ccw_queue
);
3664 spin_unlock_irq(get_ccwdev_lock(cdev
));
3666 dasd_put_device(device
);
3669 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze
);
3671 int dasd_generic_restore_device(struct ccw_device
*cdev
)
3673 struct dasd_device
*device
= dasd_device_from_cdev(cdev
);
3677 return PTR_ERR(device
);
3679 /* allow new IO again */
3680 dasd_device_remove_stop_bits(device
,
3681 (DASD_STOPPED_PM
| DASD_UNRESUMED_PM
));
3683 dasd_schedule_device_bh(device
);
3686 * call discipline restore function
3687 * if device is stopped do nothing e.g. for disconnected devices
3689 if (device
->discipline
->restore
&& !(device
->stopped
))
3690 rc
= device
->discipline
->restore(device
);
3691 if (rc
|| device
->stopped
)
3693 * if the resume failed for the DASD we put it in
3694 * an UNRESUMED stop state
3696 device
->stopped
|= DASD_UNRESUMED_PM
;
3699 dasd_schedule_block_bh(device
->block
);
3701 clear_bit(DASD_FLAG_SUSPENDED
, &device
->flags
);
3702 dasd_put_device(device
);
3705 EXPORT_SYMBOL_GPL(dasd_generic_restore_device
);
3707 static struct dasd_ccw_req
*dasd_generic_build_rdc(struct dasd_device
*device
,
3709 int rdc_buffer_size
,
3712 struct dasd_ccw_req
*cqr
;
3714 unsigned long *idaw
;
3716 cqr
= dasd_smalloc_request(magic
, 1 /* RDC */, rdc_buffer_size
, device
);
3719 /* internal error 13 - Allocating the RDC request failed*/
3720 dev_err(&device
->cdev
->dev
,
3721 "An error occurred in the DASD device driver, "
3722 "reason=%s\n", "13");
3727 ccw
->cmd_code
= CCW_CMD_RDC
;
3728 if (idal_is_needed(rdc_buffer
, rdc_buffer_size
)) {
3729 idaw
= (unsigned long *) (cqr
->data
);
3730 ccw
->cda
= (__u32
)(addr_t
) idaw
;
3731 ccw
->flags
= CCW_FLAG_IDA
;
3732 idaw
= idal_create_words(idaw
, rdc_buffer
, rdc_buffer_size
);
3734 ccw
->cda
= (__u32
)(addr_t
) rdc_buffer
;
3738 ccw
->count
= rdc_buffer_size
;
3739 cqr
->startdev
= device
;
3740 cqr
->memdev
= device
;
3741 cqr
->expires
= 10*HZ
;
3743 cqr
->buildclk
= get_tod_clock();
3744 cqr
->status
= DASD_CQR_FILLED
;
3749 int dasd_generic_read_dev_chars(struct dasd_device
*device
, int magic
,
3750 void *rdc_buffer
, int rdc_buffer_size
)
3753 struct dasd_ccw_req
*cqr
;
3755 cqr
= dasd_generic_build_rdc(device
, rdc_buffer
, rdc_buffer_size
,
3758 return PTR_ERR(cqr
);
3760 ret
= dasd_sleep_on(cqr
);
3761 dasd_sfree_request(cqr
, cqr
->memdev
);
3764 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars
);
3767 * In command mode and transport mode we need to look for sense
3768 * data in different places. The sense data itself is allways
3769 * an array of 32 bytes, so we can unify the sense data access
3772 char *dasd_get_sense(struct irb
*irb
)
3774 struct tsb
*tsb
= NULL
;
3777 if (scsw_is_tm(&irb
->scsw
) && (irb
->scsw
.tm
.fcxs
== 0x01)) {
3778 if (irb
->scsw
.tm
.tcw
)
3779 tsb
= tcw_get_tsb((struct tcw
*)(unsigned long)
3781 if (tsb
&& tsb
->length
== 64 && tsb
->flags
)
3782 switch (tsb
->flags
& 0x07) {
3783 case 1: /* tsa_iostat */
3784 sense
= tsb
->tsa
.iostat
.sense
;
3786 case 2: /* tsa_ddpc */
3787 sense
= tsb
->tsa
.ddpc
.sense
;
3790 /* currently we don't use interrogate data */
3793 } else if (irb
->esw
.esw0
.erw
.cons
) {
3798 EXPORT_SYMBOL_GPL(dasd_get_sense
);
3800 void dasd_generic_shutdown(struct ccw_device
*cdev
)
3802 struct dasd_device
*device
;
3804 device
= dasd_device_from_cdev(cdev
);
3809 dasd_schedule_block_bh(device
->block
);
3811 dasd_schedule_device_bh(device
);
3813 wait_event(shutdown_waitq
, _wait_for_empty_queues(device
));
3815 EXPORT_SYMBOL_GPL(dasd_generic_shutdown
);
3817 static int __init
dasd_init(void)
3821 init_waitqueue_head(&dasd_init_waitq
);
3822 init_waitqueue_head(&dasd_flush_wq
);
3823 init_waitqueue_head(&generic_waitq
);
3824 init_waitqueue_head(&shutdown_waitq
);
3826 /* register 'common' DASD debug area, used for all DBF_XXX calls */
3827 dasd_debug_area
= debug_register("dasd", 1, 1, 8 * sizeof(long));
3828 if (dasd_debug_area
== NULL
) {
3832 debug_register_view(dasd_debug_area
, &debug_sprintf_view
);
3833 debug_set_level(dasd_debug_area
, DBF_WARNING
);
3835 DBF_EVENT(DBF_EMERG
, "%s", "debug area created");
3837 dasd_diag_discipline_pointer
= NULL
;
3839 dasd_statistics_createroot();
3841 rc
= dasd_devmap_init();
3844 rc
= dasd_gendisk_init();
3850 rc
= dasd_eer_init();
3853 #ifdef CONFIG_PROC_FS
3854 rc
= dasd_proc_init();
3861 pr_info("The DASD device driver could not be initialized\n");
3866 module_init(dasd_init
);
3867 module_exit(dasd_exit
);
3869 EXPORT_SYMBOL(dasd_debug_area
);
3870 EXPORT_SYMBOL(dasd_diag_discipline_pointer
);
3872 EXPORT_SYMBOL(dasd_add_request_head
);
3873 EXPORT_SYMBOL(dasd_add_request_tail
);
3874 EXPORT_SYMBOL(dasd_cancel_req
);
3875 EXPORT_SYMBOL(dasd_device_clear_timer
);
3876 EXPORT_SYMBOL(dasd_block_clear_timer
);
3877 EXPORT_SYMBOL(dasd_enable_device
);
3878 EXPORT_SYMBOL(dasd_int_handler
);
3879 EXPORT_SYMBOL(dasd_kfree_request
);
3880 EXPORT_SYMBOL(dasd_kick_device
);
3881 EXPORT_SYMBOL(dasd_kmalloc_request
);
3882 EXPORT_SYMBOL(dasd_schedule_device_bh
);
3883 EXPORT_SYMBOL(dasd_schedule_block_bh
);
3884 EXPORT_SYMBOL(dasd_set_target_state
);
3885 EXPORT_SYMBOL(dasd_device_set_timer
);
3886 EXPORT_SYMBOL(dasd_block_set_timer
);
3887 EXPORT_SYMBOL(dasd_sfree_request
);
3888 EXPORT_SYMBOL(dasd_sleep_on
);
3889 EXPORT_SYMBOL(dasd_sleep_on_immediatly
);
3890 EXPORT_SYMBOL(dasd_sleep_on_interruptible
);
3891 EXPORT_SYMBOL(dasd_smalloc_request
);
3892 EXPORT_SYMBOL(dasd_start_IO
);
3893 EXPORT_SYMBOL(dasd_term_IO
);
3895 EXPORT_SYMBOL_GPL(dasd_generic_probe
);
3896 EXPORT_SYMBOL_GPL(dasd_generic_remove
);
3897 EXPORT_SYMBOL_GPL(dasd_generic_notify
);
3898 EXPORT_SYMBOL_GPL(dasd_generic_set_online
);
3899 EXPORT_SYMBOL_GPL(dasd_generic_set_offline
);
3900 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change
);
3901 EXPORT_SYMBOL_GPL(dasd_flush_device_queue
);
3902 EXPORT_SYMBOL_GPL(dasd_alloc_block
);
3903 EXPORT_SYMBOL_GPL(dasd_free_block
);