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
41 #define DASD_DIAG_MOD "dasd_diag_mod"
44 * SECTION: exported variables of dasd.c
46 debug_info_t
*dasd_debug_area
;
47 EXPORT_SYMBOL(dasd_debug_area
);
48 static struct dentry
*dasd_debugfs_root_entry
;
49 struct dasd_discipline
*dasd_diag_discipline_pointer
;
50 EXPORT_SYMBOL(dasd_diag_discipline_pointer
);
51 void dasd_int_handler(struct ccw_device
*, unsigned long, struct irb
*);
53 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
54 MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
55 " Copyright IBM Corp. 2000");
56 MODULE_SUPPORTED_DEVICE("dasd");
57 MODULE_LICENSE("GPL");
60 * SECTION: prototypes for static functions of dasd.c
62 static int dasd_alloc_queue(struct dasd_block
*);
63 static void dasd_setup_queue(struct dasd_block
*);
64 static void dasd_free_queue(struct dasd_block
*);
65 static void dasd_flush_request_queue(struct dasd_block
*);
66 static int dasd_flush_block_queue(struct dasd_block
*);
67 static void dasd_device_tasklet(struct dasd_device
*);
68 static void dasd_block_tasklet(struct dasd_block
*);
69 static void do_kick_device(struct work_struct
*);
70 static void do_restore_device(struct work_struct
*);
71 static void do_reload_device(struct work_struct
*);
72 static void dasd_return_cqr_cb(struct dasd_ccw_req
*, void *);
73 static void dasd_device_timeout(unsigned long);
74 static void dasd_block_timeout(unsigned long);
75 static void __dasd_process_erp(struct dasd_device
*, struct dasd_ccw_req
*);
76 static void dasd_profile_init(struct dasd_profile
*, struct dentry
*);
77 static void dasd_profile_exit(struct dasd_profile
*);
78 static void dasd_hosts_init(struct dentry
*, struct dasd_device
*);
79 static void dasd_hosts_exit(struct dasd_device
*);
82 * SECTION: Operations on the device structure.
84 static wait_queue_head_t dasd_init_waitq
;
85 static wait_queue_head_t dasd_flush_wq
;
86 static wait_queue_head_t generic_waitq
;
87 static wait_queue_head_t shutdown_waitq
;
90 * Allocate memory for a new device structure.
92 struct dasd_device
*dasd_alloc_device(void)
94 struct dasd_device
*device
;
96 device
= kzalloc(sizeof(struct dasd_device
), GFP_ATOMIC
);
98 return ERR_PTR(-ENOMEM
);
100 /* Get two pages for normal block device operations. */
101 device
->ccw_mem
= (void *) __get_free_pages(GFP_ATOMIC
| GFP_DMA
, 1);
102 if (!device
->ccw_mem
) {
104 return ERR_PTR(-ENOMEM
);
106 /* Get one page for error recovery. */
107 device
->erp_mem
= (void *) get_zeroed_page(GFP_ATOMIC
| GFP_DMA
);
108 if (!device
->erp_mem
) {
109 free_pages((unsigned long) device
->ccw_mem
, 1);
111 return ERR_PTR(-ENOMEM
);
114 dasd_init_chunklist(&device
->ccw_chunks
, device
->ccw_mem
, PAGE_SIZE
*2);
115 dasd_init_chunklist(&device
->erp_chunks
, device
->erp_mem
, PAGE_SIZE
);
116 spin_lock_init(&device
->mem_lock
);
117 atomic_set(&device
->tasklet_scheduled
, 0);
118 tasklet_init(&device
->tasklet
,
119 (void (*)(unsigned long)) dasd_device_tasklet
,
120 (unsigned long) device
);
121 INIT_LIST_HEAD(&device
->ccw_queue
);
122 init_timer(&device
->timer
);
123 device
->timer
.function
= dasd_device_timeout
;
124 device
->timer
.data
= (unsigned long) device
;
125 INIT_WORK(&device
->kick_work
, do_kick_device
);
126 INIT_WORK(&device
->restore_device
, do_restore_device
);
127 INIT_WORK(&device
->reload_device
, do_reload_device
);
128 device
->state
= DASD_STATE_NEW
;
129 device
->target
= DASD_STATE_NEW
;
130 mutex_init(&device
->state_mutex
);
131 spin_lock_init(&device
->profile
.lock
);
136 * Free memory of a device structure.
138 void dasd_free_device(struct dasd_device
*device
)
140 kfree(device
->private);
141 free_page((unsigned long) device
->erp_mem
);
142 free_pages((unsigned long) device
->ccw_mem
, 1);
147 * Allocate memory for a new device structure.
149 struct dasd_block
*dasd_alloc_block(void)
151 struct dasd_block
*block
;
153 block
= kzalloc(sizeof(*block
), GFP_ATOMIC
);
155 return ERR_PTR(-ENOMEM
);
156 /* open_count = 0 means device online but not in use */
157 atomic_set(&block
->open_count
, -1);
159 spin_lock_init(&block
->request_queue_lock
);
160 atomic_set(&block
->tasklet_scheduled
, 0);
161 tasklet_init(&block
->tasklet
,
162 (void (*)(unsigned long)) dasd_block_tasklet
,
163 (unsigned long) block
);
164 INIT_LIST_HEAD(&block
->ccw_queue
);
165 spin_lock_init(&block
->queue_lock
);
166 init_timer(&block
->timer
);
167 block
->timer
.function
= dasd_block_timeout
;
168 block
->timer
.data
= (unsigned long) block
;
169 spin_lock_init(&block
->profile
.lock
);
173 EXPORT_SYMBOL_GPL(dasd_alloc_block
);
176 * Free memory of a device structure.
178 void dasd_free_block(struct dasd_block
*block
)
182 EXPORT_SYMBOL_GPL(dasd_free_block
);
185 * Make a new device known to the system.
187 static int dasd_state_new_to_known(struct dasd_device
*device
)
192 * As long as the device is not in state DASD_STATE_NEW we want to
193 * keep the reference count > 0.
195 dasd_get_device(device
);
198 rc
= dasd_alloc_queue(device
->block
);
200 dasd_put_device(device
);
204 device
->state
= DASD_STATE_KNOWN
;
209 * Let the system forget about a device.
211 static int dasd_state_known_to_new(struct dasd_device
*device
)
213 /* Disable extended error reporting for this device. */
214 dasd_eer_disable(device
);
215 /* Forget the discipline information. */
216 if (device
->discipline
) {
217 if (device
->discipline
->uncheck_device
)
218 device
->discipline
->uncheck_device(device
);
219 module_put(device
->discipline
->owner
);
221 device
->discipline
= NULL
;
222 if (device
->base_discipline
)
223 module_put(device
->base_discipline
->owner
);
224 device
->base_discipline
= NULL
;
225 device
->state
= DASD_STATE_NEW
;
228 dasd_free_queue(device
->block
);
230 /* Give up reference we took in dasd_state_new_to_known. */
231 dasd_put_device(device
);
235 static struct dentry
*dasd_debugfs_setup(const char *name
,
236 struct dentry
*base_dentry
)
242 pde
= debugfs_create_dir(name
, base_dentry
);
243 if (!pde
|| IS_ERR(pde
))
249 * Request the irq line for the device.
251 static int dasd_state_known_to_basic(struct dasd_device
*device
)
253 struct dasd_block
*block
= device
->block
;
256 /* Allocate and register gendisk structure. */
258 rc
= dasd_gendisk_alloc(block
);
261 block
->debugfs_dentry
=
262 dasd_debugfs_setup(block
->gdp
->disk_name
,
263 dasd_debugfs_root_entry
);
264 dasd_profile_init(&block
->profile
, block
->debugfs_dentry
);
265 if (dasd_global_profile_level
== DASD_PROFILE_ON
)
266 dasd_profile_on(&device
->block
->profile
);
268 device
->debugfs_dentry
=
269 dasd_debugfs_setup(dev_name(&device
->cdev
->dev
),
270 dasd_debugfs_root_entry
);
271 dasd_profile_init(&device
->profile
, device
->debugfs_dentry
);
272 dasd_hosts_init(device
->debugfs_dentry
, device
);
274 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
275 device
->debug_area
= debug_register(dev_name(&device
->cdev
->dev
), 4, 1,
277 debug_register_view(device
->debug_area
, &debug_sprintf_view
);
278 debug_set_level(device
->debug_area
, DBF_WARNING
);
279 DBF_DEV_EVENT(DBF_EMERG
, device
, "%s", "debug area created");
281 device
->state
= DASD_STATE_BASIC
;
287 * Release the irq line for the device. Terminate any running i/o.
289 static int dasd_state_basic_to_known(struct dasd_device
*device
)
293 if (device
->discipline
->basic_to_known
) {
294 rc
= device
->discipline
->basic_to_known(device
);
300 dasd_profile_exit(&device
->block
->profile
);
301 debugfs_remove(device
->block
->debugfs_dentry
);
302 dasd_gendisk_free(device
->block
);
303 dasd_block_clear_timer(device
->block
);
305 rc
= dasd_flush_device_queue(device
);
308 dasd_device_clear_timer(device
);
309 dasd_profile_exit(&device
->profile
);
310 dasd_hosts_exit(device
);
311 debugfs_remove(device
->debugfs_dentry
);
312 DBF_DEV_EVENT(DBF_EMERG
, device
, "%p debug area deleted", device
);
313 if (device
->debug_area
!= NULL
) {
314 debug_unregister(device
->debug_area
);
315 device
->debug_area
= NULL
;
317 device
->state
= DASD_STATE_KNOWN
;
322 * Do the initial analysis. The do_analysis function may return
323 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
324 * until the discipline decides to continue the startup sequence
325 * by calling the function dasd_change_state. The eckd disciplines
326 * uses this to start a ccw that detects the format. The completion
327 * interrupt for this detection ccw uses the kernel event daemon to
328 * trigger the call to dasd_change_state. All this is done in the
329 * discipline code, see dasd_eckd.c.
330 * After the analysis ccw is done (do_analysis returned 0) the block
332 * In case the analysis returns an error, the device setup is stopped
333 * (a fake disk was already added to allow formatting).
335 static int dasd_state_basic_to_ready(struct dasd_device
*device
)
338 struct dasd_block
*block
;
341 block
= device
->block
;
342 /* make disk known with correct capacity */
344 if (block
->base
->discipline
->do_analysis
!= NULL
)
345 rc
= block
->base
->discipline
->do_analysis(block
);
348 device
->state
= DASD_STATE_UNFMT
;
353 dasd_setup_queue(block
);
354 set_capacity(block
->gdp
,
355 block
->blocks
<< block
->s2b_shift
);
356 device
->state
= DASD_STATE_READY
;
357 rc
= dasd_scan_partitions(block
);
359 device
->state
= DASD_STATE_BASIC
;
363 device
->state
= DASD_STATE_READY
;
366 if (device
->discipline
->basic_to_ready
)
367 rc
= device
->discipline
->basic_to_ready(device
);
372 int _wait_for_empty_queues(struct dasd_device
*device
)
375 return list_empty(&device
->ccw_queue
) &&
376 list_empty(&device
->block
->ccw_queue
);
378 return list_empty(&device
->ccw_queue
);
382 * Remove device from block device layer. Destroy dirty buffers.
383 * Forget format information. Check if the target level is basic
384 * and if it is create fake disk for formatting.
386 static int dasd_state_ready_to_basic(struct dasd_device
*device
)
390 device
->state
= DASD_STATE_BASIC
;
392 struct dasd_block
*block
= device
->block
;
393 rc
= dasd_flush_block_queue(block
);
395 device
->state
= DASD_STATE_READY
;
398 dasd_flush_request_queue(block
);
399 dasd_destroy_partitions(block
);
402 block
->s2b_shift
= 0;
410 static int dasd_state_unfmt_to_basic(struct dasd_device
*device
)
412 device
->state
= DASD_STATE_BASIC
;
417 * Make the device online and schedule the bottom half to start
418 * the requeueing of requests from the linux request queue to the
422 dasd_state_ready_to_online(struct dasd_device
* device
)
424 struct gendisk
*disk
;
425 struct disk_part_iter piter
;
426 struct hd_struct
*part
;
428 device
->state
= DASD_STATE_ONLINE
;
430 dasd_schedule_block_bh(device
->block
);
431 if ((device
->features
& DASD_FEATURE_USERAW
)) {
432 disk
= device
->block
->gdp
;
433 kobject_uevent(&disk_to_dev(disk
)->kobj
, KOBJ_CHANGE
);
436 disk
= device
->block
->bdev
->bd_disk
;
437 disk_part_iter_init(&piter
, disk
, DISK_PITER_INCL_PART0
);
438 while ((part
= disk_part_iter_next(&piter
)))
439 kobject_uevent(&part_to_dev(part
)->kobj
, KOBJ_CHANGE
);
440 disk_part_iter_exit(&piter
);
446 * Stop the requeueing of requests again.
448 static int dasd_state_online_to_ready(struct dasd_device
*device
)
451 struct gendisk
*disk
;
452 struct disk_part_iter piter
;
453 struct hd_struct
*part
;
455 if (device
->discipline
->online_to_ready
) {
456 rc
= device
->discipline
->online_to_ready(device
);
461 device
->state
= DASD_STATE_READY
;
462 if (device
->block
&& !(device
->features
& DASD_FEATURE_USERAW
)) {
463 disk
= device
->block
->bdev
->bd_disk
;
464 disk_part_iter_init(&piter
, disk
, DISK_PITER_INCL_PART0
);
465 while ((part
= disk_part_iter_next(&piter
)))
466 kobject_uevent(&part_to_dev(part
)->kobj
, KOBJ_CHANGE
);
467 disk_part_iter_exit(&piter
);
473 * Device startup state changes.
475 static int dasd_increase_state(struct dasd_device
*device
)
480 if (device
->state
== DASD_STATE_NEW
&&
481 device
->target
>= DASD_STATE_KNOWN
)
482 rc
= dasd_state_new_to_known(device
);
485 device
->state
== DASD_STATE_KNOWN
&&
486 device
->target
>= DASD_STATE_BASIC
)
487 rc
= dasd_state_known_to_basic(device
);
490 device
->state
== DASD_STATE_BASIC
&&
491 device
->target
>= DASD_STATE_READY
)
492 rc
= dasd_state_basic_to_ready(device
);
495 device
->state
== DASD_STATE_UNFMT
&&
496 device
->target
> DASD_STATE_UNFMT
)
500 device
->state
== DASD_STATE_READY
&&
501 device
->target
>= DASD_STATE_ONLINE
)
502 rc
= dasd_state_ready_to_online(device
);
508 * Device shutdown state changes.
510 static int dasd_decrease_state(struct dasd_device
*device
)
515 if (device
->state
== DASD_STATE_ONLINE
&&
516 device
->target
<= DASD_STATE_READY
)
517 rc
= dasd_state_online_to_ready(device
);
520 device
->state
== DASD_STATE_READY
&&
521 device
->target
<= DASD_STATE_BASIC
)
522 rc
= dasd_state_ready_to_basic(device
);
525 device
->state
== DASD_STATE_UNFMT
&&
526 device
->target
<= DASD_STATE_BASIC
)
527 rc
= dasd_state_unfmt_to_basic(device
);
530 device
->state
== DASD_STATE_BASIC
&&
531 device
->target
<= DASD_STATE_KNOWN
)
532 rc
= dasd_state_basic_to_known(device
);
535 device
->state
== DASD_STATE_KNOWN
&&
536 device
->target
<= DASD_STATE_NEW
)
537 rc
= dasd_state_known_to_new(device
);
543 * This is the main startup/shutdown routine.
545 static void dasd_change_state(struct dasd_device
*device
)
549 if (device
->state
== device
->target
)
550 /* Already where we want to go today... */
552 if (device
->state
< device
->target
)
553 rc
= dasd_increase_state(device
);
555 rc
= dasd_decrease_state(device
);
559 device
->target
= device
->state
;
561 /* let user-space know that the device status changed */
562 kobject_uevent(&device
->cdev
->dev
.kobj
, KOBJ_CHANGE
);
564 if (device
->state
== device
->target
)
565 wake_up(&dasd_init_waitq
);
569 * Kick starter for devices that did not complete the startup/shutdown
570 * procedure or were sleeping because of a pending state.
571 * dasd_kick_device will schedule a call do do_kick_device to the kernel
574 static void do_kick_device(struct work_struct
*work
)
576 struct dasd_device
*device
= container_of(work
, struct dasd_device
, kick_work
);
577 mutex_lock(&device
->state_mutex
);
578 dasd_change_state(device
);
579 mutex_unlock(&device
->state_mutex
);
580 dasd_schedule_device_bh(device
);
581 dasd_put_device(device
);
584 void dasd_kick_device(struct dasd_device
*device
)
586 dasd_get_device(device
);
587 /* queue call to dasd_kick_device to the kernel event daemon. */
588 if (!schedule_work(&device
->kick_work
))
589 dasd_put_device(device
);
591 EXPORT_SYMBOL(dasd_kick_device
);
594 * dasd_reload_device will schedule a call do do_reload_device to the kernel
597 static void do_reload_device(struct work_struct
*work
)
599 struct dasd_device
*device
= container_of(work
, struct dasd_device
,
601 device
->discipline
->reload(device
);
602 dasd_put_device(device
);
605 void dasd_reload_device(struct dasd_device
*device
)
607 dasd_get_device(device
);
608 /* queue call to dasd_reload_device to the kernel event daemon. */
609 if (!schedule_work(&device
->reload_device
))
610 dasd_put_device(device
);
612 EXPORT_SYMBOL(dasd_reload_device
);
615 * dasd_restore_device will schedule a call do do_restore_device to the kernel
618 static void do_restore_device(struct work_struct
*work
)
620 struct dasd_device
*device
= container_of(work
, struct dasd_device
,
622 device
->cdev
->drv
->restore(device
->cdev
);
623 dasd_put_device(device
);
626 void dasd_restore_device(struct dasd_device
*device
)
628 dasd_get_device(device
);
629 /* queue call to dasd_restore_device to the kernel event daemon. */
630 if (!schedule_work(&device
->restore_device
))
631 dasd_put_device(device
);
635 * Set the target state for a device and starts the state change.
637 void dasd_set_target_state(struct dasd_device
*device
, int target
)
639 dasd_get_device(device
);
640 mutex_lock(&device
->state_mutex
);
641 /* If we are in probeonly mode stop at DASD_STATE_READY. */
642 if (dasd_probeonly
&& target
> DASD_STATE_READY
)
643 target
= DASD_STATE_READY
;
644 if (device
->target
!= target
) {
645 if (device
->state
== target
)
646 wake_up(&dasd_init_waitq
);
647 device
->target
= target
;
649 if (device
->state
!= device
->target
)
650 dasd_change_state(device
);
651 mutex_unlock(&device
->state_mutex
);
652 dasd_put_device(device
);
654 EXPORT_SYMBOL(dasd_set_target_state
);
657 * Enable devices with device numbers in [from..to].
659 static inline int _wait_for_device(struct dasd_device
*device
)
661 return (device
->state
== device
->target
);
664 void dasd_enable_device(struct dasd_device
*device
)
666 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
667 if (device
->state
<= DASD_STATE_KNOWN
)
668 /* No discipline for device found. */
669 dasd_set_target_state(device
, DASD_STATE_NEW
);
670 /* Now wait for the devices to come up. */
671 wait_event(dasd_init_waitq
, _wait_for_device(device
));
673 dasd_reload_device(device
);
674 if (device
->discipline
->kick_validate
)
675 device
->discipline
->kick_validate(device
);
677 EXPORT_SYMBOL(dasd_enable_device
);
680 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
683 unsigned int dasd_global_profile_level
= DASD_PROFILE_OFF
;
685 #ifdef CONFIG_DASD_PROFILE
686 struct dasd_profile dasd_global_profile
= {
687 .lock
= __SPIN_LOCK_UNLOCKED(dasd_global_profile
.lock
),
689 static struct dentry
*dasd_debugfs_global_entry
;
692 * Add profiling information for cqr before execution.
694 static void dasd_profile_start(struct dasd_block
*block
,
695 struct dasd_ccw_req
*cqr
,
699 unsigned int counter
;
700 struct dasd_device
*device
;
702 /* count the length of the chanq for statistics */
704 if (dasd_global_profile_level
|| block
->profile
.data
)
705 list_for_each(l
, &block
->ccw_queue
)
709 spin_lock(&dasd_global_profile
.lock
);
710 if (dasd_global_profile
.data
) {
711 dasd_global_profile
.data
->dasd_io_nr_req
[counter
]++;
712 if (rq_data_dir(req
) == READ
)
713 dasd_global_profile
.data
->dasd_read_nr_req
[counter
]++;
715 spin_unlock(&dasd_global_profile
.lock
);
717 spin_lock(&block
->profile
.lock
);
718 if (block
->profile
.data
) {
719 block
->profile
.data
->dasd_io_nr_req
[counter
]++;
720 if (rq_data_dir(req
) == READ
)
721 block
->profile
.data
->dasd_read_nr_req
[counter
]++;
723 spin_unlock(&block
->profile
.lock
);
726 * We count the request for the start device, even though it may run on
727 * some other device due to error recovery. This way we make sure that
728 * we count each request only once.
730 device
= cqr
->startdev
;
731 if (device
->profile
.data
) {
732 counter
= 1; /* request is not yet queued on the start device */
733 list_for_each(l
, &device
->ccw_queue
)
737 spin_lock(&device
->profile
.lock
);
738 if (device
->profile
.data
) {
739 device
->profile
.data
->dasd_io_nr_req
[counter
]++;
740 if (rq_data_dir(req
) == READ
)
741 device
->profile
.data
->dasd_read_nr_req
[counter
]++;
743 spin_unlock(&device
->profile
.lock
);
747 * Add profiling information for cqr after execution.
750 #define dasd_profile_counter(value, index) \
752 for (index = 0; index < 31 && value >> (2+index); index++) \
756 static void dasd_profile_end_add_data(struct dasd_profile_info
*data
,
769 /* in case of an overflow, reset the whole profile */
770 if (data
->dasd_io_reqs
== UINT_MAX
) {
771 memset(data
, 0, sizeof(*data
));
772 getnstimeofday(&data
->starttod
);
774 data
->dasd_io_reqs
++;
775 data
->dasd_io_sects
+= sectors
;
777 data
->dasd_io_alias
++;
781 data
->dasd_io_secs
[sectors_ind
]++;
782 data
->dasd_io_times
[tottime_ind
]++;
783 data
->dasd_io_timps
[tottimeps_ind
]++;
784 data
->dasd_io_time1
[strtime_ind
]++;
785 data
->dasd_io_time2
[irqtime_ind
]++;
786 data
->dasd_io_time2ps
[irqtimeps_ind
]++;
787 data
->dasd_io_time3
[endtime_ind
]++;
790 data
->dasd_read_reqs
++;
791 data
->dasd_read_sects
+= sectors
;
793 data
->dasd_read_alias
++;
795 data
->dasd_read_tpm
++;
796 data
->dasd_read_secs
[sectors_ind
]++;
797 data
->dasd_read_times
[tottime_ind
]++;
798 data
->dasd_read_time1
[strtime_ind
]++;
799 data
->dasd_read_time2
[irqtime_ind
]++;
800 data
->dasd_read_time3
[endtime_ind
]++;
804 static void dasd_profile_end(struct dasd_block
*block
,
805 struct dasd_ccw_req
*cqr
,
808 long strtime
, irqtime
, endtime
, tottime
; /* in microseconds */
809 long tottimeps
, sectors
;
810 struct dasd_device
*device
;
811 int sectors_ind
, tottime_ind
, tottimeps_ind
, strtime_ind
;
812 int irqtime_ind
, irqtimeps_ind
, endtime_ind
;
814 device
= cqr
->startdev
;
815 if (!(dasd_global_profile_level
||
816 block
->profile
.data
||
817 device
->profile
.data
))
820 sectors
= blk_rq_sectors(req
);
821 if (!cqr
->buildclk
|| !cqr
->startclk
||
822 !cqr
->stopclk
|| !cqr
->endclk
||
826 strtime
= ((cqr
->startclk
- cqr
->buildclk
) >> 12);
827 irqtime
= ((cqr
->stopclk
- cqr
->startclk
) >> 12);
828 endtime
= ((cqr
->endclk
- cqr
->stopclk
) >> 12);
829 tottime
= ((cqr
->endclk
- cqr
->buildclk
) >> 12);
830 tottimeps
= tottime
/ sectors
;
832 dasd_profile_counter(sectors
, sectors_ind
);
833 dasd_profile_counter(tottime
, tottime_ind
);
834 dasd_profile_counter(tottimeps
, tottimeps_ind
);
835 dasd_profile_counter(strtime
, strtime_ind
);
836 dasd_profile_counter(irqtime
, irqtime_ind
);
837 dasd_profile_counter(irqtime
/ sectors
, irqtimeps_ind
);
838 dasd_profile_counter(endtime
, endtime_ind
);
840 spin_lock(&dasd_global_profile
.lock
);
841 if (dasd_global_profile
.data
) {
842 dasd_profile_end_add_data(dasd_global_profile
.data
,
843 cqr
->startdev
!= block
->base
,
845 rq_data_dir(req
) == READ
,
846 sectors
, sectors_ind
, tottime_ind
,
847 tottimeps_ind
, strtime_ind
,
848 irqtime_ind
, irqtimeps_ind
,
851 spin_unlock(&dasd_global_profile
.lock
);
853 spin_lock(&block
->profile
.lock
);
854 if (block
->profile
.data
)
855 dasd_profile_end_add_data(block
->profile
.data
,
856 cqr
->startdev
!= block
->base
,
858 rq_data_dir(req
) == READ
,
859 sectors
, sectors_ind
, tottime_ind
,
860 tottimeps_ind
, strtime_ind
,
861 irqtime_ind
, irqtimeps_ind
,
863 spin_unlock(&block
->profile
.lock
);
865 spin_lock(&device
->profile
.lock
);
866 if (device
->profile
.data
)
867 dasd_profile_end_add_data(device
->profile
.data
,
868 cqr
->startdev
!= block
->base
,
870 rq_data_dir(req
) == READ
,
871 sectors
, sectors_ind
, tottime_ind
,
872 tottimeps_ind
, strtime_ind
,
873 irqtime_ind
, irqtimeps_ind
,
875 spin_unlock(&device
->profile
.lock
);
878 void dasd_profile_reset(struct dasd_profile
*profile
)
880 struct dasd_profile_info
*data
;
882 spin_lock_bh(&profile
->lock
);
883 data
= profile
->data
;
885 spin_unlock_bh(&profile
->lock
);
888 memset(data
, 0, sizeof(*data
));
889 getnstimeofday(&data
->starttod
);
890 spin_unlock_bh(&profile
->lock
);
893 int dasd_profile_on(struct dasd_profile
*profile
)
895 struct dasd_profile_info
*data
;
897 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
900 spin_lock_bh(&profile
->lock
);
902 spin_unlock_bh(&profile
->lock
);
906 getnstimeofday(&data
->starttod
);
907 profile
->data
= data
;
908 spin_unlock_bh(&profile
->lock
);
912 void dasd_profile_off(struct dasd_profile
*profile
)
914 spin_lock_bh(&profile
->lock
);
915 kfree(profile
->data
);
916 profile
->data
= NULL
;
917 spin_unlock_bh(&profile
->lock
);
920 char *dasd_get_user_string(const char __user
*user_buf
, size_t user_len
)
924 buffer
= vmalloc(user_len
+ 1);
926 return ERR_PTR(-ENOMEM
);
927 if (copy_from_user(buffer
, user_buf
, user_len
) != 0) {
929 return ERR_PTR(-EFAULT
);
931 /* got the string, now strip linefeed. */
932 if (buffer
[user_len
- 1] == '\n')
933 buffer
[user_len
- 1] = 0;
935 buffer
[user_len
] = 0;
939 static ssize_t
dasd_stats_write(struct file
*file
,
940 const char __user
*user_buf
,
941 size_t user_len
, loff_t
*pos
)
945 struct seq_file
*m
= (struct seq_file
*)file
->private_data
;
946 struct dasd_profile
*prof
= m
->private;
948 if (user_len
> 65536)
950 buffer
= dasd_get_user_string(user_buf
, user_len
);
952 return PTR_ERR(buffer
);
954 str
= skip_spaces(buffer
);
956 if (strncmp(str
, "reset", 5) == 0) {
957 dasd_profile_reset(prof
);
958 } else if (strncmp(str
, "on", 2) == 0) {
959 rc
= dasd_profile_on(prof
);
963 if (prof
== &dasd_global_profile
) {
964 dasd_profile_reset(prof
);
965 dasd_global_profile_level
= DASD_PROFILE_GLOBAL_ONLY
;
967 } else if (strncmp(str
, "off", 3) == 0) {
968 if (prof
== &dasd_global_profile
)
969 dasd_global_profile_level
= DASD_PROFILE_OFF
;
970 dasd_profile_off(prof
);
978 static void dasd_stats_array(struct seq_file
*m
, unsigned int *array
)
982 for (i
= 0; i
< 32; i
++)
983 seq_printf(m
, "%u ", array
[i
]);
987 static void dasd_stats_seq_print(struct seq_file
*m
,
988 struct dasd_profile_info
*data
)
990 seq_printf(m
, "start_time %ld.%09ld\n",
991 data
->starttod
.tv_sec
, data
->starttod
.tv_nsec
);
992 seq_printf(m
, "total_requests %u\n", data
->dasd_io_reqs
);
993 seq_printf(m
, "total_sectors %u\n", data
->dasd_io_sects
);
994 seq_printf(m
, "total_pav %u\n", data
->dasd_io_alias
);
995 seq_printf(m
, "total_hpf %u\n", data
->dasd_io_tpm
);
996 seq_puts(m
, "histogram_sectors ");
997 dasd_stats_array(m
, data
->dasd_io_secs
);
998 seq_puts(m
, "histogram_io_times ");
999 dasd_stats_array(m
, data
->dasd_io_times
);
1000 seq_puts(m
, "histogram_io_times_weighted ");
1001 dasd_stats_array(m
, data
->dasd_io_timps
);
1002 seq_puts(m
, "histogram_time_build_to_ssch ");
1003 dasd_stats_array(m
, data
->dasd_io_time1
);
1004 seq_puts(m
, "histogram_time_ssch_to_irq ");
1005 dasd_stats_array(m
, data
->dasd_io_time2
);
1006 seq_puts(m
, "histogram_time_ssch_to_irq_weighted ");
1007 dasd_stats_array(m
, data
->dasd_io_time2ps
);
1008 seq_puts(m
, "histogram_time_irq_to_end ");
1009 dasd_stats_array(m
, data
->dasd_io_time3
);
1010 seq_puts(m
, "histogram_ccw_queue_length ");
1011 dasd_stats_array(m
, data
->dasd_io_nr_req
);
1012 seq_printf(m
, "total_read_requests %u\n", data
->dasd_read_reqs
);
1013 seq_printf(m
, "total_read_sectors %u\n", data
->dasd_read_sects
);
1014 seq_printf(m
, "total_read_pav %u\n", data
->dasd_read_alias
);
1015 seq_printf(m
, "total_read_hpf %u\n", data
->dasd_read_tpm
);
1016 seq_puts(m
, "histogram_read_sectors ");
1017 dasd_stats_array(m
, data
->dasd_read_secs
);
1018 seq_puts(m
, "histogram_read_times ");
1019 dasd_stats_array(m
, data
->dasd_read_times
);
1020 seq_puts(m
, "histogram_read_time_build_to_ssch ");
1021 dasd_stats_array(m
, data
->dasd_read_time1
);
1022 seq_puts(m
, "histogram_read_time_ssch_to_irq ");
1023 dasd_stats_array(m
, data
->dasd_read_time2
);
1024 seq_puts(m
, "histogram_read_time_irq_to_end ");
1025 dasd_stats_array(m
, data
->dasd_read_time3
);
1026 seq_puts(m
, "histogram_read_ccw_queue_length ");
1027 dasd_stats_array(m
, data
->dasd_read_nr_req
);
1030 static int dasd_stats_show(struct seq_file
*m
, void *v
)
1032 struct dasd_profile
*profile
;
1033 struct dasd_profile_info
*data
;
1035 profile
= m
->private;
1036 spin_lock_bh(&profile
->lock
);
1037 data
= profile
->data
;
1039 spin_unlock_bh(&profile
->lock
);
1040 seq_puts(m
, "disabled\n");
1043 dasd_stats_seq_print(m
, data
);
1044 spin_unlock_bh(&profile
->lock
);
1048 static int dasd_stats_open(struct inode
*inode
, struct file
*file
)
1050 struct dasd_profile
*profile
= inode
->i_private
;
1051 return single_open(file
, dasd_stats_show
, profile
);
1054 static const struct file_operations dasd_stats_raw_fops
= {
1055 .owner
= THIS_MODULE
,
1056 .open
= dasd_stats_open
,
1058 .llseek
= seq_lseek
,
1059 .release
= single_release
,
1060 .write
= dasd_stats_write
,
1063 static void dasd_profile_init(struct dasd_profile
*profile
,
1064 struct dentry
*base_dentry
)
1071 profile
->dentry
= NULL
;
1072 profile
->data
= NULL
;
1073 mode
= (S_IRUSR
| S_IWUSR
| S_IFREG
);
1074 pde
= debugfs_create_file("statistics", mode
, base_dentry
,
1075 profile
, &dasd_stats_raw_fops
);
1076 if (pde
&& !IS_ERR(pde
))
1077 profile
->dentry
= pde
;
1081 static void dasd_profile_exit(struct dasd_profile
*profile
)
1083 dasd_profile_off(profile
);
1084 debugfs_remove(profile
->dentry
);
1085 profile
->dentry
= NULL
;
1088 static void dasd_statistics_removeroot(void)
1090 dasd_global_profile_level
= DASD_PROFILE_OFF
;
1091 dasd_profile_exit(&dasd_global_profile
);
1092 debugfs_remove(dasd_debugfs_global_entry
);
1093 debugfs_remove(dasd_debugfs_root_entry
);
1096 static void dasd_statistics_createroot(void)
1100 dasd_debugfs_root_entry
= NULL
;
1101 pde
= debugfs_create_dir("dasd", NULL
);
1102 if (!pde
|| IS_ERR(pde
))
1104 dasd_debugfs_root_entry
= pde
;
1105 pde
= debugfs_create_dir("global", dasd_debugfs_root_entry
);
1106 if (!pde
|| IS_ERR(pde
))
1108 dasd_debugfs_global_entry
= pde
;
1109 dasd_profile_init(&dasd_global_profile
, dasd_debugfs_global_entry
);
1113 DBF_EVENT(DBF_ERR
, "%s",
1114 "Creation of the dasd debugfs interface failed");
1115 dasd_statistics_removeroot();
1120 #define dasd_profile_start(block, cqr, req) do {} while (0)
1121 #define dasd_profile_end(block, cqr, req) do {} while (0)
1123 static void dasd_statistics_createroot(void)
1128 static void dasd_statistics_removeroot(void)
1133 int dasd_stats_generic_show(struct seq_file
*m
, void *v
)
1135 seq_puts(m
, "Statistics are not activated in this kernel\n");
1139 static void dasd_profile_init(struct dasd_profile
*profile
,
1140 struct dentry
*base_dentry
)
1145 static void dasd_profile_exit(struct dasd_profile
*profile
)
1150 int dasd_profile_on(struct dasd_profile
*profile
)
1155 #endif /* CONFIG_DASD_PROFILE */
1157 static int dasd_hosts_show(struct seq_file
*m
, void *v
)
1159 struct dasd_device
*device
;
1160 int rc
= -EOPNOTSUPP
;
1162 device
= m
->private;
1163 dasd_get_device(device
);
1165 if (device
->discipline
->hosts_print
)
1166 rc
= device
->discipline
->hosts_print(device
, m
);
1168 dasd_put_device(device
);
1172 static int dasd_hosts_open(struct inode
*inode
, struct file
*file
)
1174 struct dasd_device
*device
= inode
->i_private
;
1176 return single_open(file
, dasd_hosts_show
, device
);
1179 static const struct file_operations dasd_hosts_fops
= {
1180 .owner
= THIS_MODULE
,
1181 .open
= dasd_hosts_open
,
1183 .llseek
= seq_lseek
,
1184 .release
= single_release
,
1187 static void dasd_hosts_exit(struct dasd_device
*device
)
1189 debugfs_remove(device
->hosts_dentry
);
1190 device
->hosts_dentry
= NULL
;
1193 static void dasd_hosts_init(struct dentry
*base_dentry
,
1194 struct dasd_device
*device
)
1202 mode
= S_IRUSR
| S_IFREG
;
1203 pde
= debugfs_create_file("host_access_list", mode
, base_dentry
,
1204 device
, &dasd_hosts_fops
);
1205 if (pde
&& !IS_ERR(pde
))
1206 device
->hosts_dentry
= pde
;
1210 * Allocate memory for a channel program with 'cplength' channel
1211 * command words and 'datasize' additional space. There are two
1212 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
1213 * memory and 2) dasd_smalloc_request uses the static ccw memory
1214 * that gets allocated for each device.
1216 struct dasd_ccw_req
*dasd_kmalloc_request(int magic
, int cplength
,
1218 struct dasd_device
*device
)
1220 struct dasd_ccw_req
*cqr
;
1223 BUG_ON(datasize
> PAGE_SIZE
||
1224 (cplength
*sizeof(struct ccw1
)) > PAGE_SIZE
);
1226 cqr
= kzalloc(sizeof(struct dasd_ccw_req
), GFP_ATOMIC
);
1228 return ERR_PTR(-ENOMEM
);
1231 cqr
->cpaddr
= kcalloc(cplength
, sizeof(struct ccw1
),
1232 GFP_ATOMIC
| GFP_DMA
);
1233 if (cqr
->cpaddr
== NULL
) {
1235 return ERR_PTR(-ENOMEM
);
1240 cqr
->data
= kzalloc(datasize
, GFP_ATOMIC
| GFP_DMA
);
1241 if (cqr
->data
== NULL
) {
1244 return ERR_PTR(-ENOMEM
);
1248 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
1249 dasd_get_device(device
);
1252 EXPORT_SYMBOL(dasd_kmalloc_request
);
1254 struct dasd_ccw_req
*dasd_smalloc_request(int magic
, int cplength
,
1256 struct dasd_device
*device
)
1258 unsigned long flags
;
1259 struct dasd_ccw_req
*cqr
;
1263 size
= (sizeof(struct dasd_ccw_req
) + 7L) & -8L;
1265 size
+= cplength
* sizeof(struct ccw1
);
1268 spin_lock_irqsave(&device
->mem_lock
, flags
);
1269 cqr
= (struct dasd_ccw_req
*)
1270 dasd_alloc_chunk(&device
->ccw_chunks
, size
);
1271 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
1273 return ERR_PTR(-ENOMEM
);
1274 memset(cqr
, 0, sizeof(struct dasd_ccw_req
));
1275 data
= (char *) cqr
+ ((sizeof(struct dasd_ccw_req
) + 7L) & -8L);
1278 cqr
->cpaddr
= (struct ccw1
*) data
;
1279 data
+= cplength
*sizeof(struct ccw1
);
1280 memset(cqr
->cpaddr
, 0, cplength
*sizeof(struct ccw1
));
1285 memset(cqr
->data
, 0, datasize
);
1288 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
1289 dasd_get_device(device
);
1292 EXPORT_SYMBOL(dasd_smalloc_request
);
1295 * Free memory of a channel program. This function needs to free all the
1296 * idal lists that might have been created by dasd_set_cda and the
1297 * struct dasd_ccw_req itself.
1299 void dasd_kfree_request(struct dasd_ccw_req
*cqr
, struct dasd_device
*device
)
1303 /* Clear any idals used for the request. */
1306 clear_normalized_cda(ccw
);
1307 } while (ccw
++->flags
& (CCW_FLAG_CC
| CCW_FLAG_DC
));
1311 dasd_put_device(device
);
1313 EXPORT_SYMBOL(dasd_kfree_request
);
1315 void dasd_sfree_request(struct dasd_ccw_req
*cqr
, struct dasd_device
*device
)
1317 unsigned long flags
;
1319 spin_lock_irqsave(&device
->mem_lock
, flags
);
1320 dasd_free_chunk(&device
->ccw_chunks
, cqr
);
1321 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
1322 dasd_put_device(device
);
1324 EXPORT_SYMBOL(dasd_sfree_request
);
1327 * Check discipline magic in cqr.
1329 static inline int dasd_check_cqr(struct dasd_ccw_req
*cqr
)
1331 struct dasd_device
*device
;
1335 device
= cqr
->startdev
;
1336 if (strncmp((char *) &cqr
->magic
, device
->discipline
->ebcname
, 4)) {
1337 DBF_DEV_EVENT(DBF_WARNING
, device
,
1338 " dasd_ccw_req 0x%08x magic doesn't match"
1339 " discipline 0x%08x",
1341 *(unsigned int *) device
->discipline
->name
);
1348 * Terminate the current i/o and set the request to clear_pending.
1349 * Timer keeps device runnig.
1350 * ccw_device_clear can fail if the i/o subsystem
1353 int dasd_term_IO(struct dasd_ccw_req
*cqr
)
1355 struct dasd_device
*device
;
1357 char errorstring
[ERRORLENGTH
];
1360 rc
= dasd_check_cqr(cqr
);
1364 device
= (struct dasd_device
*) cqr
->startdev
;
1365 while ((retries
< 5) && (cqr
->status
== DASD_CQR_IN_IO
)) {
1366 rc
= ccw_device_clear(device
->cdev
, (long) cqr
);
1368 case 0: /* termination successful */
1369 cqr
->status
= DASD_CQR_CLEAR_PENDING
;
1370 cqr
->stopclk
= get_tod_clock();
1372 DBF_DEV_EVENT(DBF_DEBUG
, device
,
1373 "terminate cqr %p successful",
1377 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
1378 "device gone, retry");
1381 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
1382 "I/O error, retry");
1386 * device not valid so no I/O could be running
1387 * handle CQR as termination successful
1389 cqr
->status
= DASD_CQR_CLEARED
;
1390 cqr
->stopclk
= get_tod_clock();
1392 /* no retries for invalid devices */
1394 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
1395 "EINVAL, handle as terminated");
1396 /* fake rc to success */
1400 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
1401 "device busy, retry later");
1404 /* internal error 10 - unknown rc*/
1405 snprintf(errorstring
, ERRORLENGTH
, "10 %d", rc
);
1406 dev_err(&device
->cdev
->dev
, "An error occurred in the "
1407 "DASD device driver, reason=%s\n", errorstring
);
1413 dasd_schedule_device_bh(device
);
1416 EXPORT_SYMBOL(dasd_term_IO
);
1419 * Start the i/o. This start_IO can fail if the channel is really busy.
1420 * In that case set up a timer to start the request later.
1422 int dasd_start_IO(struct dasd_ccw_req
*cqr
)
1424 struct dasd_device
*device
;
1426 char errorstring
[ERRORLENGTH
];
1429 rc
= dasd_check_cqr(cqr
);
1434 device
= (struct dasd_device
*) cqr
->startdev
;
1436 test_bit(DASD_FLAG_LOCK_STOLEN
, &cqr
->block
->base
->flags
)) ||
1437 test_bit(DASD_FLAG_LOCK_STOLEN
, &device
->flags
)) &&
1438 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
1439 DBF_DEV_EVENT(DBF_DEBUG
, device
, "start_IO: return request %p "
1440 "because of stolen lock", cqr
);
1441 cqr
->status
= DASD_CQR_ERROR
;
1442 cqr
->intrc
= -EPERM
;
1445 if (cqr
->retries
< 0) {
1446 /* internal error 14 - start_IO run out of retries */
1447 sprintf(errorstring
, "14 %p", cqr
);
1448 dev_err(&device
->cdev
->dev
, "An error occurred in the DASD "
1449 "device driver, reason=%s\n", errorstring
);
1450 cqr
->status
= DASD_CQR_ERROR
;
1453 cqr
->startclk
= get_tod_clock();
1454 cqr
->starttime
= jiffies
;
1456 if (!test_bit(DASD_CQR_VERIFY_PATH
, &cqr
->flags
)) {
1457 cqr
->lpm
&= device
->path_data
.opm
;
1459 cqr
->lpm
= device
->path_data
.opm
;
1461 if (cqr
->cpmode
== 1) {
1462 rc
= ccw_device_tm_start(device
->cdev
, cqr
->cpaddr
,
1463 (long) cqr
, cqr
->lpm
);
1465 rc
= ccw_device_start(device
->cdev
, cqr
->cpaddr
,
1466 (long) cqr
, cqr
->lpm
, 0);
1470 cqr
->status
= DASD_CQR_IN_IO
;
1473 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1474 "start_IO: device busy, retry later");
1477 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1478 "start_IO: request timeout, retry later");
1481 /* -EACCES indicates that the request used only a subset of the
1482 * available paths and all these paths are gone. If the lpm of
1483 * this request was only a subset of the opm (e.g. the ppm) then
1484 * we just do a retry with all available paths.
1485 * If we already use the full opm, something is amiss, and we
1486 * need a full path verification.
1488 if (test_bit(DASD_CQR_VERIFY_PATH
, &cqr
->flags
)) {
1489 DBF_DEV_EVENT(DBF_WARNING
, device
,
1490 "start_IO: selected paths gone (%x)",
1492 } else if (cqr
->lpm
!= device
->path_data
.opm
) {
1493 cqr
->lpm
= device
->path_data
.opm
;
1494 DBF_DEV_EVENT(DBF_DEBUG
, device
, "%s",
1495 "start_IO: selected paths gone,"
1496 " retry on all paths");
1498 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1499 "start_IO: all paths in opm gone,"
1500 " do path verification");
1501 dasd_generic_last_path_gone(device
);
1502 device
->path_data
.opm
= 0;
1503 device
->path_data
.ppm
= 0;
1504 device
->path_data
.npm
= 0;
1505 device
->path_data
.tbvpm
=
1506 ccw_device_get_path_mask(device
->cdev
);
1510 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1511 "start_IO: -ENODEV device gone, retry");
1514 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1515 "start_IO: -EIO device gone, retry");
1518 /* most likely caused in power management context */
1519 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1520 "start_IO: -EINVAL device currently "
1524 /* internal error 11 - unknown rc */
1525 snprintf(errorstring
, ERRORLENGTH
, "11 %d", rc
);
1526 dev_err(&device
->cdev
->dev
,
1527 "An error occurred in the DASD device driver, "
1528 "reason=%s\n", errorstring
);
1535 EXPORT_SYMBOL(dasd_start_IO
);
1538 * Timeout function for dasd devices. This is used for different purposes
1539 * 1) missing interrupt handler for normal operation
1540 * 2) delayed start of request where start_IO failed with -EBUSY
1541 * 3) timeout for missing state change interrupts
1542 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
1543 * DASD_CQR_QUEUED for 2) and 3).
1545 static void dasd_device_timeout(unsigned long ptr
)
1547 unsigned long flags
;
1548 struct dasd_device
*device
;
1550 device
= (struct dasd_device
*) ptr
;
1551 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1552 /* re-activate request queue */
1553 dasd_device_remove_stop_bits(device
, DASD_STOPPED_PENDING
);
1554 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1555 dasd_schedule_device_bh(device
);
1559 * Setup timeout for a device in jiffies.
1561 void dasd_device_set_timer(struct dasd_device
*device
, int expires
)
1564 del_timer(&device
->timer
);
1566 mod_timer(&device
->timer
, jiffies
+ expires
);
1568 EXPORT_SYMBOL(dasd_device_set_timer
);
1571 * Clear timeout for a device.
1573 void dasd_device_clear_timer(struct dasd_device
*device
)
1575 del_timer(&device
->timer
);
1577 EXPORT_SYMBOL(dasd_device_clear_timer
);
1579 static void dasd_handle_killed_request(struct ccw_device
*cdev
,
1580 unsigned long intparm
)
1582 struct dasd_ccw_req
*cqr
;
1583 struct dasd_device
*device
;
1587 cqr
= (struct dasd_ccw_req
*) intparm
;
1588 if (cqr
->status
!= DASD_CQR_IN_IO
) {
1589 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
,
1590 "invalid status in handle_killed_request: "
1591 "%02x", cqr
->status
);
1595 device
= dasd_device_from_cdev_locked(cdev
);
1596 if (IS_ERR(device
)) {
1597 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
, "%s",
1598 "unable to get device from cdev");
1602 if (!cqr
->startdev
||
1603 device
!= cqr
->startdev
||
1604 strncmp(cqr
->startdev
->discipline
->ebcname
,
1605 (char *) &cqr
->magic
, 4)) {
1606 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
, "%s",
1607 "invalid device in request");
1608 dasd_put_device(device
);
1612 /* Schedule request to be retried. */
1613 cqr
->status
= DASD_CQR_QUEUED
;
1615 dasd_device_clear_timer(device
);
1616 dasd_schedule_device_bh(device
);
1617 dasd_put_device(device
);
1620 void dasd_generic_handle_state_change(struct dasd_device
*device
)
1622 /* First of all start sense subsystem status request. */
1623 dasd_eer_snss(device
);
1625 dasd_device_remove_stop_bits(device
, DASD_STOPPED_PENDING
);
1626 dasd_schedule_device_bh(device
);
1628 dasd_schedule_block_bh(device
->block
);
1630 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change
);
1633 * Interrupt handler for "normal" ssch-io based dasd devices.
1635 void dasd_int_handler(struct ccw_device
*cdev
, unsigned long intparm
,
1638 struct dasd_ccw_req
*cqr
, *next
;
1639 struct dasd_device
*device
;
1640 unsigned long long now
;
1641 int nrf_suppressed
= 0;
1642 int fp_suppressed
= 0;
1646 cqr
= (struct dasd_ccw_req
*) intparm
;
1648 switch (PTR_ERR(irb
)) {
1650 if (cqr
&& cqr
->status
== DASD_CQR_CLEAR_PENDING
) {
1651 device
= (struct dasd_device
*) cqr
->startdev
;
1652 cqr
->status
= DASD_CQR_CLEARED
;
1653 dasd_device_clear_timer(device
);
1654 wake_up(&dasd_flush_wq
);
1655 dasd_schedule_device_bh(device
);
1660 DBF_EVENT_DEVID(DBF_WARNING
, cdev
, "%s: "
1661 "request timed out\n", __func__
);
1664 DBF_EVENT_DEVID(DBF_WARNING
, cdev
, "%s: "
1665 "unknown error %ld\n", __func__
,
1668 dasd_handle_killed_request(cdev
, intparm
);
1672 now
= get_tod_clock();
1673 /* check for conditions that should be handled immediately */
1675 !(scsw_dstat(&irb
->scsw
) == (DEV_STAT_CHN_END
| DEV_STAT_DEV_END
) &&
1676 scsw_cstat(&irb
->scsw
) == 0)) {
1678 memcpy(&cqr
->irb
, irb
, sizeof(*irb
));
1679 device
= dasd_device_from_cdev_locked(cdev
);
1682 /* ignore unsolicited interrupts for DIAG discipline */
1683 if (device
->discipline
== dasd_diag_discipline_pointer
) {
1684 dasd_put_device(device
);
1689 * In some cases 'File Protected' or 'No Record Found' errors
1690 * might be expected and debug log messages for the
1691 * corresponding interrupts shouldn't be written then.
1692 * Check if either of the according suppress bits is set.
1694 sense
= dasd_get_sense(irb
);
1696 fp_suppressed
= (sense
[1] & SNS1_FILE_PROTECTED
) &&
1697 test_bit(DASD_CQR_SUPPRESS_FP
, &cqr
->flags
);
1698 nrf_suppressed
= (sense
[1] & SNS1_NO_REC_FOUND
) &&
1699 test_bit(DASD_CQR_SUPPRESS_NRF
, &cqr
->flags
);
1701 if (!(fp_suppressed
|| nrf_suppressed
))
1702 device
->discipline
->dump_sense_dbf(device
, irb
, "int");
1704 if (device
->features
& DASD_FEATURE_ERPLOG
)
1705 device
->discipline
->dump_sense(device
, cqr
, irb
);
1706 device
->discipline
->check_for_device_change(device
, cqr
, irb
);
1707 dasd_put_device(device
);
1710 /* check for for attention message */
1711 if (scsw_dstat(&irb
->scsw
) & DEV_STAT_ATTENTION
) {
1712 device
= dasd_device_from_cdev_locked(cdev
);
1713 device
->discipline
->check_attention(device
, irb
->esw
.esw1
.lpum
);
1714 dasd_put_device(device
);
1720 device
= (struct dasd_device
*) cqr
->startdev
;
1722 strncmp(device
->discipline
->ebcname
, (char *) &cqr
->magic
, 4)) {
1723 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
, "%s",
1724 "invalid device in request");
1728 /* Check for clear pending */
1729 if (cqr
->status
== DASD_CQR_CLEAR_PENDING
&&
1730 scsw_fctl(&irb
->scsw
) & SCSW_FCTL_CLEAR_FUNC
) {
1731 cqr
->status
= DASD_CQR_CLEARED
;
1732 dasd_device_clear_timer(device
);
1733 wake_up(&dasd_flush_wq
);
1734 dasd_schedule_device_bh(device
);
1738 /* check status - the request might have been killed by dyn detach */
1739 if (cqr
->status
!= DASD_CQR_IN_IO
) {
1740 DBF_DEV_EVENT(DBF_DEBUG
, device
, "invalid status: bus_id %s, "
1741 "status %02x", dev_name(&cdev
->dev
), cqr
->status
);
1747 if (scsw_dstat(&irb
->scsw
) == (DEV_STAT_CHN_END
| DEV_STAT_DEV_END
) &&
1748 scsw_cstat(&irb
->scsw
) == 0) {
1749 /* request was completed successfully */
1750 cqr
->status
= DASD_CQR_SUCCESS
;
1752 /* Start first request on queue if possible -> fast_io. */
1753 if (cqr
->devlist
.next
!= &device
->ccw_queue
) {
1754 next
= list_entry(cqr
->devlist
.next
,
1755 struct dasd_ccw_req
, devlist
);
1757 } else { /* error */
1759 * If we don't want complex ERP for this request, then just
1760 * reset this and retry it in the fastpath
1762 if (!test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
) &&
1764 if (cqr
->lpm
== device
->path_data
.opm
)
1765 DBF_DEV_EVENT(DBF_DEBUG
, device
,
1766 "default ERP in fastpath "
1767 "(%i retries left)",
1769 if (!test_bit(DASD_CQR_VERIFY_PATH
, &cqr
->flags
))
1770 cqr
->lpm
= device
->path_data
.opm
;
1771 cqr
->status
= DASD_CQR_QUEUED
;
1774 cqr
->status
= DASD_CQR_ERROR
;
1776 if (next
&& (next
->status
== DASD_CQR_QUEUED
) &&
1777 (!device
->stopped
)) {
1778 if (device
->discipline
->start_IO(next
) == 0)
1779 expires
= next
->expires
;
1782 dasd_device_set_timer(device
, expires
);
1784 dasd_device_clear_timer(device
);
1785 dasd_schedule_device_bh(device
);
1787 EXPORT_SYMBOL(dasd_int_handler
);
1789 enum uc_todo
dasd_generic_uc_handler(struct ccw_device
*cdev
, struct irb
*irb
)
1791 struct dasd_device
*device
;
1793 device
= dasd_device_from_cdev_locked(cdev
);
1797 if (test_bit(DASD_FLAG_OFFLINE
, &device
->flags
) ||
1798 device
->state
!= device
->target
||
1799 !device
->discipline
->check_for_device_change
){
1800 dasd_put_device(device
);
1803 if (device
->discipline
->dump_sense_dbf
)
1804 device
->discipline
->dump_sense_dbf(device
, irb
, "uc");
1805 device
->discipline
->check_for_device_change(device
, NULL
, irb
);
1806 dasd_put_device(device
);
1808 return UC_TODO_RETRY
;
1810 EXPORT_SYMBOL_GPL(dasd_generic_uc_handler
);
1813 * If we have an error on a dasd_block layer request then we cancel
1814 * and return all further requests from the same dasd_block as well.
1816 static void __dasd_device_recovery(struct dasd_device
*device
,
1817 struct dasd_ccw_req
*ref_cqr
)
1819 struct list_head
*l
, *n
;
1820 struct dasd_ccw_req
*cqr
;
1823 * only requeue request that came from the dasd_block layer
1825 if (!ref_cqr
->block
)
1828 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1829 cqr
= list_entry(l
, struct dasd_ccw_req
, devlist
);
1830 if (cqr
->status
== DASD_CQR_QUEUED
&&
1831 ref_cqr
->block
== cqr
->block
) {
1832 cqr
->status
= DASD_CQR_CLEARED
;
1838 * Remove those ccw requests from the queue that need to be returned
1839 * to the upper layer.
1841 static void __dasd_device_process_ccw_queue(struct dasd_device
*device
,
1842 struct list_head
*final_queue
)
1844 struct list_head
*l
, *n
;
1845 struct dasd_ccw_req
*cqr
;
1847 /* Process request with final status. */
1848 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1849 cqr
= list_entry(l
, struct dasd_ccw_req
, devlist
);
1851 /* Skip any non-final request. */
1852 if (cqr
->status
== DASD_CQR_QUEUED
||
1853 cqr
->status
== DASD_CQR_IN_IO
||
1854 cqr
->status
== DASD_CQR_CLEAR_PENDING
)
1856 if (cqr
->status
== DASD_CQR_ERROR
) {
1857 __dasd_device_recovery(device
, cqr
);
1859 /* Rechain finished requests to final queue */
1860 list_move_tail(&cqr
->devlist
, final_queue
);
1865 * the cqrs from the final queue are returned to the upper layer
1866 * by setting a dasd_block state and calling the callback function
1868 static void __dasd_device_process_final_queue(struct dasd_device
*device
,
1869 struct list_head
*final_queue
)
1871 struct list_head
*l
, *n
;
1872 struct dasd_ccw_req
*cqr
;
1873 struct dasd_block
*block
;
1874 void (*callback
)(struct dasd_ccw_req
*, void *data
);
1875 void *callback_data
;
1876 char errorstring
[ERRORLENGTH
];
1878 list_for_each_safe(l
, n
, final_queue
) {
1879 cqr
= list_entry(l
, struct dasd_ccw_req
, devlist
);
1880 list_del_init(&cqr
->devlist
);
1882 callback
= cqr
->callback
;
1883 callback_data
= cqr
->callback_data
;
1885 spin_lock_bh(&block
->queue_lock
);
1886 switch (cqr
->status
) {
1887 case DASD_CQR_SUCCESS
:
1888 cqr
->status
= DASD_CQR_DONE
;
1890 case DASD_CQR_ERROR
:
1891 cqr
->status
= DASD_CQR_NEED_ERP
;
1893 case DASD_CQR_CLEARED
:
1894 cqr
->status
= DASD_CQR_TERMINATED
;
1897 /* internal error 12 - wrong cqr status*/
1898 snprintf(errorstring
, ERRORLENGTH
, "12 %p %x02", cqr
, cqr
->status
);
1899 dev_err(&device
->cdev
->dev
,
1900 "An error occurred in the DASD device driver, "
1901 "reason=%s\n", errorstring
);
1904 if (cqr
->callback
!= NULL
)
1905 (callback
)(cqr
, callback_data
);
1907 spin_unlock_bh(&block
->queue_lock
);
1912 * Take a look at the first request on the ccw queue and check
1913 * if it reached its expire time. If so, terminate the IO.
1915 static void __dasd_device_check_expire(struct dasd_device
*device
)
1917 struct dasd_ccw_req
*cqr
;
1919 if (list_empty(&device
->ccw_queue
))
1921 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, devlist
);
1922 if ((cqr
->status
== DASD_CQR_IN_IO
&& cqr
->expires
!= 0) &&
1923 (time_after_eq(jiffies
, cqr
->expires
+ cqr
->starttime
))) {
1924 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
1926 * IO in safe offline processing should not
1927 * run out of retries
1931 if (device
->discipline
->term_IO(cqr
) != 0) {
1932 /* Hmpf, try again in 5 sec */
1933 dev_err(&device
->cdev
->dev
,
1934 "cqr %p timed out (%lus) but cannot be "
1935 "ended, retrying in 5 s\n",
1936 cqr
, (cqr
->expires
/HZ
));
1937 cqr
->expires
+= 5*HZ
;
1938 dasd_device_set_timer(device
, 5*HZ
);
1940 dev_err(&device
->cdev
->dev
,
1941 "cqr %p timed out (%lus), %i retries "
1942 "remaining\n", cqr
, (cqr
->expires
/HZ
),
1949 * return 1 when device is not eligible for IO
1951 static int __dasd_device_is_unusable(struct dasd_device
*device
,
1952 struct dasd_ccw_req
*cqr
)
1954 int mask
= ~(DASD_STOPPED_DC_WAIT
| DASD_UNRESUMED_PM
);
1956 if (test_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
1957 /* dasd is being set offline. */
1960 if (device
->stopped
) {
1961 if (device
->stopped
& mask
) {
1962 /* stopped and CQR will not change that. */
1965 if (!test_bit(DASD_CQR_VERIFY_PATH
, &cqr
->flags
)) {
1966 /* CQR is not able to change device to
1970 /* CQR required to get device operational. */
1976 * Take a look at the first request on the ccw queue and check
1977 * if it needs to be started.
1979 static void __dasd_device_start_head(struct dasd_device
*device
)
1981 struct dasd_ccw_req
*cqr
;
1984 if (list_empty(&device
->ccw_queue
))
1986 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, devlist
);
1987 if (cqr
->status
!= DASD_CQR_QUEUED
)
1989 /* if device is not usable return request to upper layer */
1990 if (__dasd_device_is_unusable(device
, cqr
)) {
1991 cqr
->intrc
= -EAGAIN
;
1992 cqr
->status
= DASD_CQR_CLEARED
;
1993 dasd_schedule_device_bh(device
);
1997 rc
= device
->discipline
->start_IO(cqr
);
1999 dasd_device_set_timer(device
, cqr
->expires
);
2000 else if (rc
== -EACCES
) {
2001 dasd_schedule_device_bh(device
);
2003 /* Hmpf, try again in 1/2 sec */
2004 dasd_device_set_timer(device
, 50);
2007 static void __dasd_device_check_path_events(struct dasd_device
*device
)
2011 if (device
->path_data
.tbvpm
) {
2012 if (device
->stopped
& ~(DASD_STOPPED_DC_WAIT
|
2015 rc
= device
->discipline
->verify_path(
2016 device
, device
->path_data
.tbvpm
);
2018 dasd_device_set_timer(device
, 50);
2020 device
->path_data
.tbvpm
= 0;
2025 * Go through all request on the dasd_device request queue,
2026 * terminate them on the cdev if necessary, and return them to the
2027 * submitting layer via callback.
2029 * Make sure that all 'submitting layers' still exist when
2030 * this function is called!. In other words, when 'device' is a base
2031 * device then all block layer requests must have been removed before
2032 * via dasd_flush_block_queue.
2034 int dasd_flush_device_queue(struct dasd_device
*device
)
2036 struct dasd_ccw_req
*cqr
, *n
;
2038 struct list_head flush_queue
;
2040 INIT_LIST_HEAD(&flush_queue
);
2041 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
2043 list_for_each_entry_safe(cqr
, n
, &device
->ccw_queue
, devlist
) {
2044 /* Check status and move request to flush_queue */
2045 switch (cqr
->status
) {
2046 case DASD_CQR_IN_IO
:
2047 rc
= device
->discipline
->term_IO(cqr
);
2049 /* unable to terminate requeust */
2050 dev_err(&device
->cdev
->dev
,
2051 "Flushing the DASD request queue "
2052 "failed for request %p\n", cqr
);
2053 /* stop flush processing */
2057 case DASD_CQR_QUEUED
:
2058 cqr
->stopclk
= get_tod_clock();
2059 cqr
->status
= DASD_CQR_CLEARED
;
2061 default: /* no need to modify the others */
2064 list_move_tail(&cqr
->devlist
, &flush_queue
);
2067 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2069 * After this point all requests must be in state CLEAR_PENDING,
2070 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
2071 * one of the others.
2073 list_for_each_entry_safe(cqr
, n
, &flush_queue
, devlist
)
2074 wait_event(dasd_flush_wq
,
2075 (cqr
->status
!= DASD_CQR_CLEAR_PENDING
));
2077 * Now set each request back to TERMINATED, DONE or NEED_ERP
2078 * and call the callback function of flushed requests
2080 __dasd_device_process_final_queue(device
, &flush_queue
);
2083 EXPORT_SYMBOL_GPL(dasd_flush_device_queue
);
2086 * Acquire the device lock and process queues for the device.
2088 static void dasd_device_tasklet(struct dasd_device
*device
)
2090 struct list_head final_queue
;
2092 atomic_set (&device
->tasklet_scheduled
, 0);
2093 INIT_LIST_HEAD(&final_queue
);
2094 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
2095 /* Check expire time of first request on the ccw queue. */
2096 __dasd_device_check_expire(device
);
2097 /* find final requests on ccw queue */
2098 __dasd_device_process_ccw_queue(device
, &final_queue
);
2099 __dasd_device_check_path_events(device
);
2100 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2101 /* Now call the callback function of requests with final status */
2102 __dasd_device_process_final_queue(device
, &final_queue
);
2103 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
2104 /* Now check if the head of the ccw queue needs to be started. */
2105 __dasd_device_start_head(device
);
2106 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2107 if (waitqueue_active(&shutdown_waitq
))
2108 wake_up(&shutdown_waitq
);
2109 dasd_put_device(device
);
2113 * Schedules a call to dasd_tasklet over the device tasklet.
2115 void dasd_schedule_device_bh(struct dasd_device
*device
)
2117 /* Protect against rescheduling. */
2118 if (atomic_cmpxchg (&device
->tasklet_scheduled
, 0, 1) != 0)
2120 dasd_get_device(device
);
2121 tasklet_hi_schedule(&device
->tasklet
);
2123 EXPORT_SYMBOL(dasd_schedule_device_bh
);
2125 void dasd_device_set_stop_bits(struct dasd_device
*device
, int bits
)
2127 device
->stopped
|= bits
;
2129 EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits
);
2131 void dasd_device_remove_stop_bits(struct dasd_device
*device
, int bits
)
2133 device
->stopped
&= ~bits
;
2134 if (!device
->stopped
)
2135 wake_up(&generic_waitq
);
2137 EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits
);
2140 * Queue a request to the head of the device ccw_queue.
2141 * Start the I/O if possible.
2143 void dasd_add_request_head(struct dasd_ccw_req
*cqr
)
2145 struct dasd_device
*device
;
2146 unsigned long flags
;
2148 device
= cqr
->startdev
;
2149 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
2150 cqr
->status
= DASD_CQR_QUEUED
;
2151 list_add(&cqr
->devlist
, &device
->ccw_queue
);
2152 /* let the bh start the request to keep them in order */
2153 dasd_schedule_device_bh(device
);
2154 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
2156 EXPORT_SYMBOL(dasd_add_request_head
);
2159 * Queue a request to the tail of the device ccw_queue.
2160 * Start the I/O if possible.
2162 void dasd_add_request_tail(struct dasd_ccw_req
*cqr
)
2164 struct dasd_device
*device
;
2165 unsigned long flags
;
2167 device
= cqr
->startdev
;
2168 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
2169 cqr
->status
= DASD_CQR_QUEUED
;
2170 list_add_tail(&cqr
->devlist
, &device
->ccw_queue
);
2171 /* let the bh start the request to keep them in order */
2172 dasd_schedule_device_bh(device
);
2173 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
2175 EXPORT_SYMBOL(dasd_add_request_tail
);
2178 * Wakeup helper for the 'sleep_on' functions.
2180 void dasd_wakeup_cb(struct dasd_ccw_req
*cqr
, void *data
)
2182 spin_lock_irq(get_ccwdev_lock(cqr
->startdev
->cdev
));
2183 cqr
->callback_data
= DASD_SLEEPON_END_TAG
;
2184 spin_unlock_irq(get_ccwdev_lock(cqr
->startdev
->cdev
));
2185 wake_up(&generic_waitq
);
2187 EXPORT_SYMBOL_GPL(dasd_wakeup_cb
);
2189 static inline int _wait_for_wakeup(struct dasd_ccw_req
*cqr
)
2191 struct dasd_device
*device
;
2194 device
= cqr
->startdev
;
2195 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
2196 rc
= (cqr
->callback_data
== DASD_SLEEPON_END_TAG
);
2197 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2202 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
2204 static int __dasd_sleep_on_erp(struct dasd_ccw_req
*cqr
)
2206 struct dasd_device
*device
;
2207 dasd_erp_fn_t erp_fn
;
2209 if (cqr
->status
== DASD_CQR_FILLED
)
2211 device
= cqr
->startdev
;
2212 if (test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
)) {
2213 if (cqr
->status
== DASD_CQR_TERMINATED
) {
2214 device
->discipline
->handle_terminated_request(cqr
);
2217 if (cqr
->status
== DASD_CQR_NEED_ERP
) {
2218 erp_fn
= device
->discipline
->erp_action(cqr
);
2222 if (cqr
->status
== DASD_CQR_FAILED
)
2223 dasd_log_sense(cqr
, &cqr
->irb
);
2225 __dasd_process_erp(device
, cqr
);
2232 static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req
*cqr
)
2234 if (test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
)) {
2235 if (cqr
->refers
) /* erp is not done yet */
2237 return ((cqr
->status
!= DASD_CQR_DONE
) &&
2238 (cqr
->status
!= DASD_CQR_FAILED
));
2240 return (cqr
->status
== DASD_CQR_FILLED
);
2243 static int _dasd_sleep_on(struct dasd_ccw_req
*maincqr
, int interruptible
)
2245 struct dasd_device
*device
;
2247 struct list_head ccw_queue
;
2248 struct dasd_ccw_req
*cqr
;
2250 INIT_LIST_HEAD(&ccw_queue
);
2251 maincqr
->status
= DASD_CQR_FILLED
;
2252 device
= maincqr
->startdev
;
2253 list_add(&maincqr
->blocklist
, &ccw_queue
);
2254 for (cqr
= maincqr
; __dasd_sleep_on_loop_condition(cqr
);
2255 cqr
= list_first_entry(&ccw_queue
,
2256 struct dasd_ccw_req
, blocklist
)) {
2258 if (__dasd_sleep_on_erp(cqr
))
2260 if (cqr
->status
!= DASD_CQR_FILLED
) /* could be failed */
2262 if (test_bit(DASD_FLAG_LOCK_STOLEN
, &device
->flags
) &&
2263 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
2264 cqr
->status
= DASD_CQR_FAILED
;
2265 cqr
->intrc
= -EPERM
;
2268 /* Non-temporary stop condition will trigger fail fast */
2269 if (device
->stopped
& ~DASD_STOPPED_PENDING
&&
2270 test_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
) &&
2271 (!dasd_eer_enabled(device
))) {
2272 cqr
->status
= DASD_CQR_FAILED
;
2273 cqr
->intrc
= -ENOLINK
;
2277 * Don't try to start requests if device is stopped
2278 * except path verification requests
2280 if (!test_bit(DASD_CQR_VERIFY_PATH
, &cqr
->flags
)) {
2281 if (interruptible
) {
2282 rc
= wait_event_interruptible(
2283 generic_waitq
, !(device
->stopped
));
2284 if (rc
== -ERESTARTSYS
) {
2285 cqr
->status
= DASD_CQR_FAILED
;
2286 maincqr
->intrc
= rc
;
2290 wait_event(generic_waitq
, !(device
->stopped
));
2293 cqr
->callback
= dasd_wakeup_cb
;
2295 cqr
->callback_data
= DASD_SLEEPON_START_TAG
;
2296 dasd_add_request_tail(cqr
);
2297 if (interruptible
) {
2298 rc
= wait_event_interruptible(
2299 generic_waitq
, _wait_for_wakeup(cqr
));
2300 if (rc
== -ERESTARTSYS
) {
2301 dasd_cancel_req(cqr
);
2302 /* wait (non-interruptible) for final status */
2303 wait_event(generic_waitq
,
2304 _wait_for_wakeup(cqr
));
2305 cqr
->status
= DASD_CQR_FAILED
;
2306 maincqr
->intrc
= rc
;
2310 wait_event(generic_waitq
, _wait_for_wakeup(cqr
));
2313 maincqr
->endclk
= get_tod_clock();
2314 if ((maincqr
->status
!= DASD_CQR_DONE
) &&
2315 (maincqr
->intrc
!= -ERESTARTSYS
))
2316 dasd_log_sense(maincqr
, &maincqr
->irb
);
2317 if (maincqr
->status
== DASD_CQR_DONE
)
2319 else if (maincqr
->intrc
)
2320 rc
= maincqr
->intrc
;
2326 static inline int _wait_for_wakeup_queue(struct list_head
*ccw_queue
)
2328 struct dasd_ccw_req
*cqr
;
2330 list_for_each_entry(cqr
, ccw_queue
, blocklist
) {
2331 if (cqr
->callback_data
!= DASD_SLEEPON_END_TAG
)
2338 static int _dasd_sleep_on_queue(struct list_head
*ccw_queue
, int interruptible
)
2340 struct dasd_device
*device
;
2341 struct dasd_ccw_req
*cqr
, *n
;
2346 list_for_each_entry_safe(cqr
, n
, ccw_queue
, blocklist
) {
2347 device
= cqr
->startdev
;
2348 if (cqr
->status
!= DASD_CQR_FILLED
) /*could be failed*/
2351 if (test_bit(DASD_FLAG_LOCK_STOLEN
, &device
->flags
) &&
2352 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
2353 cqr
->status
= DASD_CQR_FAILED
;
2354 cqr
->intrc
= -EPERM
;
2357 /*Non-temporary stop condition will trigger fail fast*/
2358 if (device
->stopped
& ~DASD_STOPPED_PENDING
&&
2359 test_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
) &&
2360 !dasd_eer_enabled(device
)) {
2361 cqr
->status
= DASD_CQR_FAILED
;
2362 cqr
->intrc
= -EAGAIN
;
2366 /*Don't try to start requests if device is stopped*/
2367 if (interruptible
) {
2368 rc
= wait_event_interruptible(
2369 generic_waitq
, !device
->stopped
);
2370 if (rc
== -ERESTARTSYS
) {
2371 cqr
->status
= DASD_CQR_FAILED
;
2376 wait_event(generic_waitq
, !(device
->stopped
));
2379 cqr
->callback
= dasd_wakeup_cb
;
2380 cqr
->callback_data
= DASD_SLEEPON_START_TAG
;
2381 dasd_add_request_tail(cqr
);
2384 wait_event(generic_waitq
, _wait_for_wakeup_queue(ccw_queue
));
2387 list_for_each_entry_safe(cqr
, n
, ccw_queue
, blocklist
) {
2389 * In some cases the 'File Protected' or 'Incorrect Length'
2390 * error might be expected and error recovery would be
2391 * unnecessary in these cases. Check if the according suppress
2394 sense
= dasd_get_sense(&cqr
->irb
);
2395 if (sense
&& sense
[1] & SNS1_FILE_PROTECTED
&&
2396 test_bit(DASD_CQR_SUPPRESS_FP
, &cqr
->flags
))
2398 if (scsw_cstat(&cqr
->irb
.scsw
) == 0x40 &&
2399 test_bit(DASD_CQR_SUPPRESS_IL
, &cqr
->flags
))
2403 * for alias devices simplify error recovery and
2404 * return to upper layer
2405 * do not skip ERP requests
2407 if (cqr
->startdev
!= cqr
->basedev
&& !cqr
->refers
&&
2408 (cqr
->status
== DASD_CQR_TERMINATED
||
2409 cqr
->status
== DASD_CQR_NEED_ERP
))
2412 /* normal recovery for basedev IO */
2413 if (__dasd_sleep_on_erp(cqr
))
2414 /* handle erp first */
2422 * Queue a request to the tail of the device ccw_queue and wait for
2425 int dasd_sleep_on(struct dasd_ccw_req
*cqr
)
2427 return _dasd_sleep_on(cqr
, 0);
2429 EXPORT_SYMBOL(dasd_sleep_on
);
2432 * Start requests from a ccw_queue and wait for their completion.
2434 int dasd_sleep_on_queue(struct list_head
*ccw_queue
)
2436 return _dasd_sleep_on_queue(ccw_queue
, 0);
2438 EXPORT_SYMBOL(dasd_sleep_on_queue
);
2441 * Queue a request to the tail of the device ccw_queue and wait
2442 * interruptible for it's completion.
2444 int dasd_sleep_on_interruptible(struct dasd_ccw_req
*cqr
)
2446 return _dasd_sleep_on(cqr
, 1);
2448 EXPORT_SYMBOL(dasd_sleep_on_interruptible
);
2451 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
2452 * for eckd devices) the currently running request has to be terminated
2453 * and be put back to status queued, before the special request is added
2454 * to the head of the queue. Then the special request is waited on normally.
2456 static inline int _dasd_term_running_cqr(struct dasd_device
*device
)
2458 struct dasd_ccw_req
*cqr
;
2461 if (list_empty(&device
->ccw_queue
))
2463 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, devlist
);
2464 rc
= device
->discipline
->term_IO(cqr
);
2467 * CQR terminated because a more important request is pending.
2468 * Undo decreasing of retry counter because this is
2469 * not an error case.
2475 int dasd_sleep_on_immediatly(struct dasd_ccw_req
*cqr
)
2477 struct dasd_device
*device
;
2480 device
= cqr
->startdev
;
2481 if (test_bit(DASD_FLAG_LOCK_STOLEN
, &device
->flags
) &&
2482 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
2483 cqr
->status
= DASD_CQR_FAILED
;
2484 cqr
->intrc
= -EPERM
;
2487 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
2488 rc
= _dasd_term_running_cqr(device
);
2490 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2493 cqr
->callback
= dasd_wakeup_cb
;
2494 cqr
->callback_data
= DASD_SLEEPON_START_TAG
;
2495 cqr
->status
= DASD_CQR_QUEUED
;
2497 * add new request as second
2498 * first the terminated cqr needs to be finished
2500 list_add(&cqr
->devlist
, device
->ccw_queue
.next
);
2502 /* let the bh start the request to keep them in order */
2503 dasd_schedule_device_bh(device
);
2505 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2507 wait_event(generic_waitq
, _wait_for_wakeup(cqr
));
2509 if (cqr
->status
== DASD_CQR_DONE
)
2511 else if (cqr
->intrc
)
2517 dasd_schedule_device_bh(device
);
2519 dasd_schedule_block_bh(device
->block
);
2523 EXPORT_SYMBOL(dasd_sleep_on_immediatly
);
2526 * Cancels a request that was started with dasd_sleep_on_req.
2527 * This is useful to timeout requests. The request will be
2528 * terminated if it is currently in i/o.
2529 * Returns 0 if request termination was successful
2530 * negative error code if termination failed
2531 * Cancellation of a request is an asynchronous operation! The calling
2532 * function has to wait until the request is properly returned via callback.
2534 int dasd_cancel_req(struct dasd_ccw_req
*cqr
)
2536 struct dasd_device
*device
= cqr
->startdev
;
2537 unsigned long flags
;
2541 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
2542 switch (cqr
->status
) {
2543 case DASD_CQR_QUEUED
:
2544 /* request was not started - just set to cleared */
2545 cqr
->status
= DASD_CQR_CLEARED
;
2546 if (cqr
->callback_data
== DASD_SLEEPON_START_TAG
)
2547 cqr
->callback_data
= DASD_SLEEPON_END_TAG
;
2549 case DASD_CQR_IN_IO
:
2550 /* request in IO - terminate IO and release again */
2551 rc
= device
->discipline
->term_IO(cqr
);
2553 dev_err(&device
->cdev
->dev
,
2554 "Cancelling request %p failed with rc=%d\n",
2557 cqr
->stopclk
= get_tod_clock();
2560 default: /* already finished or clear pending - do nothing */
2563 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
2564 dasd_schedule_device_bh(device
);
2567 EXPORT_SYMBOL(dasd_cancel_req
);
2570 * SECTION: Operations of the dasd_block layer.
2574 * Timeout function for dasd_block. This is used when the block layer
2575 * is waiting for something that may not come reliably, (e.g. a state
2578 static void dasd_block_timeout(unsigned long ptr
)
2580 unsigned long flags
;
2581 struct dasd_block
*block
;
2583 block
= (struct dasd_block
*) ptr
;
2584 spin_lock_irqsave(get_ccwdev_lock(block
->base
->cdev
), flags
);
2585 /* re-activate request queue */
2586 dasd_device_remove_stop_bits(block
->base
, DASD_STOPPED_PENDING
);
2587 spin_unlock_irqrestore(get_ccwdev_lock(block
->base
->cdev
), flags
);
2588 dasd_schedule_block_bh(block
);
2592 * Setup timeout for a dasd_block in jiffies.
2594 void dasd_block_set_timer(struct dasd_block
*block
, int expires
)
2597 del_timer(&block
->timer
);
2599 mod_timer(&block
->timer
, jiffies
+ expires
);
2601 EXPORT_SYMBOL(dasd_block_set_timer
);
2604 * Clear timeout for a dasd_block.
2606 void dasd_block_clear_timer(struct dasd_block
*block
)
2608 del_timer(&block
->timer
);
2610 EXPORT_SYMBOL(dasd_block_clear_timer
);
2613 * Process finished error recovery ccw.
2615 static void __dasd_process_erp(struct dasd_device
*device
,
2616 struct dasd_ccw_req
*cqr
)
2618 dasd_erp_fn_t erp_fn
;
2620 if (cqr
->status
== DASD_CQR_DONE
)
2621 DBF_DEV_EVENT(DBF_NOTICE
, device
, "%s", "ERP successful");
2623 dev_err(&device
->cdev
->dev
, "ERP failed for the DASD\n");
2624 erp_fn
= device
->discipline
->erp_postaction(cqr
);
2629 * Fetch requests from the block device queue.
2631 static void __dasd_process_request_queue(struct dasd_block
*block
)
2633 struct request_queue
*queue
;
2634 struct request
*req
;
2635 struct dasd_ccw_req
*cqr
;
2636 struct dasd_device
*basedev
;
2637 unsigned long flags
;
2638 queue
= block
->request_queue
;
2639 basedev
= block
->base
;
2640 /* No queue ? Then there is nothing to do. */
2645 * We requeue request from the block device queue to the ccw
2646 * queue only in two states. In state DASD_STATE_READY the
2647 * partition detection is done and we need to requeue requests
2648 * for that. State DASD_STATE_ONLINE is normal block device
2651 if (basedev
->state
< DASD_STATE_READY
) {
2652 while ((req
= blk_fetch_request(block
->request_queue
)))
2653 __blk_end_request_all(req
, -EIO
);
2658 * if device is stopped do not fetch new requests
2659 * except failfast is active which will let requests fail
2660 * immediately in __dasd_block_start_head()
2662 if (basedev
->stopped
&& !(basedev
->features
& DASD_FEATURE_FAILFAST
))
2665 /* Now we try to fetch requests from the request queue */
2666 while ((req
= blk_peek_request(queue
))) {
2667 if (basedev
->features
& DASD_FEATURE_READONLY
&&
2668 rq_data_dir(req
) == WRITE
) {
2669 DBF_DEV_EVENT(DBF_ERR
, basedev
,
2670 "Rejecting write request %p",
2672 blk_start_request(req
);
2673 __blk_end_request_all(req
, -EIO
);
2676 if (test_bit(DASD_FLAG_ABORTALL
, &basedev
->flags
) &&
2677 (basedev
->features
& DASD_FEATURE_FAILFAST
||
2678 blk_noretry_request(req
))) {
2679 DBF_DEV_EVENT(DBF_ERR
, basedev
,
2680 "Rejecting failfast request %p",
2682 blk_start_request(req
);
2683 __blk_end_request_all(req
, -ETIMEDOUT
);
2686 cqr
= basedev
->discipline
->build_cp(basedev
, block
, req
);
2688 if (PTR_ERR(cqr
) == -EBUSY
)
2689 break; /* normal end condition */
2690 if (PTR_ERR(cqr
) == -ENOMEM
)
2691 break; /* terminate request queue loop */
2692 if (PTR_ERR(cqr
) == -EAGAIN
) {
2694 * The current request cannot be build right
2695 * now, we have to try later. If this request
2696 * is the head-of-queue we stop the device
2699 if (!list_empty(&block
->ccw_queue
))
2702 get_ccwdev_lock(basedev
->cdev
), flags
);
2703 dasd_device_set_stop_bits(basedev
,
2704 DASD_STOPPED_PENDING
);
2705 spin_unlock_irqrestore(
2706 get_ccwdev_lock(basedev
->cdev
), flags
);
2707 dasd_block_set_timer(block
, HZ
/2);
2710 DBF_DEV_EVENT(DBF_ERR
, basedev
,
2711 "CCW creation failed (rc=%ld) "
2714 blk_start_request(req
);
2715 __blk_end_request_all(req
, -EIO
);
2719 * Note: callback is set to dasd_return_cqr_cb in
2720 * __dasd_block_start_head to cover erp requests as well
2722 cqr
->callback_data
= (void *) req
;
2723 cqr
->status
= DASD_CQR_FILLED
;
2724 req
->completion_data
= cqr
;
2725 blk_start_request(req
);
2726 list_add_tail(&cqr
->blocklist
, &block
->ccw_queue
);
2727 INIT_LIST_HEAD(&cqr
->devlist
);
2728 dasd_profile_start(block
, cqr
, req
);
2732 static void __dasd_cleanup_cqr(struct dasd_ccw_req
*cqr
)
2734 struct request
*req
;
2738 req
= (struct request
*) cqr
->callback_data
;
2739 dasd_profile_end(cqr
->block
, cqr
, req
);
2740 status
= cqr
->block
->base
->discipline
->free_cp(cqr
, req
);
2743 else if (status
== 0) {
2744 if (cqr
->intrc
== -EPERM
)
2746 else if (cqr
->intrc
== -ENOLINK
||
2747 cqr
->intrc
== -ETIMEDOUT
)
2752 __blk_end_request_all(req
, error
);
2756 * Process ccw request queue.
2758 static void __dasd_process_block_ccw_queue(struct dasd_block
*block
,
2759 struct list_head
*final_queue
)
2761 struct list_head
*l
, *n
;
2762 struct dasd_ccw_req
*cqr
;
2763 dasd_erp_fn_t erp_fn
;
2764 unsigned long flags
;
2765 struct dasd_device
*base
= block
->base
;
2768 /* Process request with final status. */
2769 list_for_each_safe(l
, n
, &block
->ccw_queue
) {
2770 cqr
= list_entry(l
, struct dasd_ccw_req
, blocklist
);
2771 if (cqr
->status
!= DASD_CQR_DONE
&&
2772 cqr
->status
!= DASD_CQR_FAILED
&&
2773 cqr
->status
!= DASD_CQR_NEED_ERP
&&
2774 cqr
->status
!= DASD_CQR_TERMINATED
)
2777 if (cqr
->status
== DASD_CQR_TERMINATED
) {
2778 base
->discipline
->handle_terminated_request(cqr
);
2782 /* Process requests that may be recovered */
2783 if (cqr
->status
== DASD_CQR_NEED_ERP
) {
2784 erp_fn
= base
->discipline
->erp_action(cqr
);
2785 if (IS_ERR(erp_fn(cqr
)))
2790 /* log sense for fatal error */
2791 if (cqr
->status
== DASD_CQR_FAILED
) {
2792 dasd_log_sense(cqr
, &cqr
->irb
);
2795 /* First of all call extended error reporting. */
2796 if (dasd_eer_enabled(base
) &&
2797 cqr
->status
== DASD_CQR_FAILED
) {
2798 dasd_eer_write(base
, cqr
, DASD_EER_FATALERROR
);
2800 /* restart request */
2801 cqr
->status
= DASD_CQR_FILLED
;
2803 spin_lock_irqsave(get_ccwdev_lock(base
->cdev
), flags
);
2804 dasd_device_set_stop_bits(base
, DASD_STOPPED_QUIESCE
);
2805 spin_unlock_irqrestore(get_ccwdev_lock(base
->cdev
),
2810 /* Process finished ERP request. */
2812 __dasd_process_erp(base
, cqr
);
2816 /* Rechain finished requests to final queue */
2817 cqr
->endclk
= get_tod_clock();
2818 list_move_tail(&cqr
->blocklist
, final_queue
);
2822 static void dasd_return_cqr_cb(struct dasd_ccw_req
*cqr
, void *data
)
2824 dasd_schedule_block_bh(cqr
->block
);
2827 static void __dasd_block_start_head(struct dasd_block
*block
)
2829 struct dasd_ccw_req
*cqr
;
2831 if (list_empty(&block
->ccw_queue
))
2833 /* We allways begin with the first requests on the queue, as some
2834 * of previously started requests have to be enqueued on a
2835 * dasd_device again for error recovery.
2837 list_for_each_entry(cqr
, &block
->ccw_queue
, blocklist
) {
2838 if (cqr
->status
!= DASD_CQR_FILLED
)
2840 if (test_bit(DASD_FLAG_LOCK_STOLEN
, &block
->base
->flags
) &&
2841 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
2842 cqr
->status
= DASD_CQR_FAILED
;
2843 cqr
->intrc
= -EPERM
;
2844 dasd_schedule_block_bh(block
);
2847 /* Non-temporary stop condition will trigger fail fast */
2848 if (block
->base
->stopped
& ~DASD_STOPPED_PENDING
&&
2849 test_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
) &&
2850 (!dasd_eer_enabled(block
->base
))) {
2851 cqr
->status
= DASD_CQR_FAILED
;
2852 cqr
->intrc
= -ENOLINK
;
2853 dasd_schedule_block_bh(block
);
2856 /* Don't try to start requests if device is stopped */
2857 if (block
->base
->stopped
)
2860 /* just a fail safe check, should not happen */
2862 cqr
->startdev
= block
->base
;
2864 /* make sure that the requests we submit find their way back */
2865 cqr
->callback
= dasd_return_cqr_cb
;
2867 dasd_add_request_tail(cqr
);
2872 * Central dasd_block layer routine. Takes requests from the generic
2873 * block layer request queue, creates ccw requests, enqueues them on
2874 * a dasd_device and processes ccw requests that have been returned.
2876 static void dasd_block_tasklet(struct dasd_block
*block
)
2878 struct list_head final_queue
;
2879 struct list_head
*l
, *n
;
2880 struct dasd_ccw_req
*cqr
;
2882 atomic_set(&block
->tasklet_scheduled
, 0);
2883 INIT_LIST_HEAD(&final_queue
);
2884 spin_lock(&block
->queue_lock
);
2885 /* Finish off requests on ccw queue */
2886 __dasd_process_block_ccw_queue(block
, &final_queue
);
2887 spin_unlock(&block
->queue_lock
);
2888 /* Now call the callback function of requests with final status */
2889 spin_lock_irq(&block
->request_queue_lock
);
2890 list_for_each_safe(l
, n
, &final_queue
) {
2891 cqr
= list_entry(l
, struct dasd_ccw_req
, blocklist
);
2892 list_del_init(&cqr
->blocklist
);
2893 __dasd_cleanup_cqr(cqr
);
2895 spin_lock(&block
->queue_lock
);
2896 /* Get new request from the block device request queue */
2897 __dasd_process_request_queue(block
);
2898 /* Now check if the head of the ccw queue needs to be started. */
2899 __dasd_block_start_head(block
);
2900 spin_unlock(&block
->queue_lock
);
2901 spin_unlock_irq(&block
->request_queue_lock
);
2902 if (waitqueue_active(&shutdown_waitq
))
2903 wake_up(&shutdown_waitq
);
2904 dasd_put_device(block
->base
);
2907 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req
*cqr
, void *data
)
2909 wake_up(&dasd_flush_wq
);
2913 * Requeue a request back to the block request queue
2914 * only works for block requests
2916 static int _dasd_requeue_request(struct dasd_ccw_req
*cqr
)
2918 struct dasd_block
*block
= cqr
->block
;
2919 struct request
*req
;
2920 unsigned long flags
;
2924 spin_lock_irqsave(&block
->queue_lock
, flags
);
2925 req
= (struct request
*) cqr
->callback_data
;
2926 blk_requeue_request(block
->request_queue
, req
);
2927 spin_unlock_irqrestore(&block
->queue_lock
, flags
);
2933 * Go through all request on the dasd_block request queue, cancel them
2934 * on the respective dasd_device, and return them to the generic
2937 static int dasd_flush_block_queue(struct dasd_block
*block
)
2939 struct dasd_ccw_req
*cqr
, *n
;
2941 struct list_head flush_queue
;
2943 INIT_LIST_HEAD(&flush_queue
);
2944 spin_lock_bh(&block
->queue_lock
);
2947 list_for_each_entry_safe(cqr
, n
, &block
->ccw_queue
, blocklist
) {
2948 /* if this request currently owned by a dasd_device cancel it */
2949 if (cqr
->status
>= DASD_CQR_QUEUED
)
2950 rc
= dasd_cancel_req(cqr
);
2953 /* Rechain request (including erp chain) so it won't be
2954 * touched by the dasd_block_tasklet anymore.
2955 * Replace the callback so we notice when the request
2956 * is returned from the dasd_device layer.
2958 cqr
->callback
= _dasd_wake_block_flush_cb
;
2959 for (i
= 0; cqr
!= NULL
; cqr
= cqr
->refers
, i
++)
2960 list_move_tail(&cqr
->blocklist
, &flush_queue
);
2962 /* moved more than one request - need to restart */
2965 spin_unlock_bh(&block
->queue_lock
);
2966 /* Now call the callback function of flushed requests */
2968 list_for_each_entry_safe(cqr
, n
, &flush_queue
, blocklist
) {
2969 wait_event(dasd_flush_wq
, (cqr
->status
< DASD_CQR_QUEUED
));
2970 /* Process finished ERP request. */
2972 spin_lock_bh(&block
->queue_lock
);
2973 __dasd_process_erp(block
->base
, cqr
);
2974 spin_unlock_bh(&block
->queue_lock
);
2975 /* restart list_for_xx loop since dasd_process_erp
2976 * might remove multiple elements */
2979 /* call the callback function */
2980 spin_lock_irq(&block
->request_queue_lock
);
2981 cqr
->endclk
= get_tod_clock();
2982 list_del_init(&cqr
->blocklist
);
2983 __dasd_cleanup_cqr(cqr
);
2984 spin_unlock_irq(&block
->request_queue_lock
);
2990 * Schedules a call to dasd_tasklet over the device tasklet.
2992 void dasd_schedule_block_bh(struct dasd_block
*block
)
2994 /* Protect against rescheduling. */
2995 if (atomic_cmpxchg(&block
->tasklet_scheduled
, 0, 1) != 0)
2997 /* life cycle of block is bound to it's base device */
2998 dasd_get_device(block
->base
);
2999 tasklet_hi_schedule(&block
->tasklet
);
3001 EXPORT_SYMBOL(dasd_schedule_block_bh
);
3005 * SECTION: external block device operations
3006 * (request queue handling, open, release, etc.)
3010 * Dasd request queue function. Called from ll_rw_blk.c
3012 static void do_dasd_request(struct request_queue
*queue
)
3014 struct dasd_block
*block
;
3016 block
= queue
->queuedata
;
3017 spin_lock(&block
->queue_lock
);
3018 /* Get new request from the block device request queue */
3019 __dasd_process_request_queue(block
);
3020 /* Now check if the head of the ccw queue needs to be started. */
3021 __dasd_block_start_head(block
);
3022 spin_unlock(&block
->queue_lock
);
3026 * Block timeout callback, called from the block layer
3028 * request_queue lock is held on entry.
3031 * BLK_EH_RESET_TIMER if the request should be left running
3032 * BLK_EH_NOT_HANDLED if the request is handled or terminated
3035 enum blk_eh_timer_return
dasd_times_out(struct request
*req
)
3037 struct dasd_ccw_req
*cqr
= req
->completion_data
;
3038 struct dasd_block
*block
= req
->q
->queuedata
;
3039 struct dasd_device
*device
;
3043 return BLK_EH_NOT_HANDLED
;
3045 device
= cqr
->startdev
? cqr
->startdev
: block
->base
;
3046 if (!device
->blk_timeout
)
3047 return BLK_EH_RESET_TIMER
;
3048 DBF_DEV_EVENT(DBF_WARNING
, device
,
3049 " dasd_times_out cqr %p status %x",
3052 spin_lock(&block
->queue_lock
);
3053 spin_lock(get_ccwdev_lock(device
->cdev
));
3055 cqr
->intrc
= -ETIMEDOUT
;
3056 if (cqr
->status
>= DASD_CQR_QUEUED
) {
3057 spin_unlock(get_ccwdev_lock(device
->cdev
));
3058 rc
= dasd_cancel_req(cqr
);
3059 } else if (cqr
->status
== DASD_CQR_FILLED
||
3060 cqr
->status
== DASD_CQR_NEED_ERP
) {
3061 cqr
->status
= DASD_CQR_TERMINATED
;
3062 spin_unlock(get_ccwdev_lock(device
->cdev
));
3063 } else if (cqr
->status
== DASD_CQR_IN_ERP
) {
3064 struct dasd_ccw_req
*searchcqr
, *nextcqr
, *tmpcqr
;
3066 list_for_each_entry_safe(searchcqr
, nextcqr
,
3067 &block
->ccw_queue
, blocklist
) {
3069 while (tmpcqr
->refers
)
3070 tmpcqr
= tmpcqr
->refers
;
3073 /* searchcqr is an ERP request for cqr */
3074 searchcqr
->retries
= -1;
3075 searchcqr
->intrc
= -ETIMEDOUT
;
3076 if (searchcqr
->status
>= DASD_CQR_QUEUED
) {
3077 spin_unlock(get_ccwdev_lock(device
->cdev
));
3078 rc
= dasd_cancel_req(searchcqr
);
3079 spin_lock(get_ccwdev_lock(device
->cdev
));
3080 } else if ((searchcqr
->status
== DASD_CQR_FILLED
) ||
3081 (searchcqr
->status
== DASD_CQR_NEED_ERP
)) {
3082 searchcqr
->status
= DASD_CQR_TERMINATED
;
3084 } else if (searchcqr
->status
== DASD_CQR_IN_ERP
) {
3086 * Shouldn't happen; most recent ERP
3087 * request is at the front of queue
3093 spin_unlock(get_ccwdev_lock(device
->cdev
));
3095 dasd_schedule_block_bh(block
);
3096 spin_unlock(&block
->queue_lock
);
3098 return rc
? BLK_EH_RESET_TIMER
: BLK_EH_NOT_HANDLED
;
3102 * Allocate and initialize request queue and default I/O scheduler.
3104 static int dasd_alloc_queue(struct dasd_block
*block
)
3106 block
->request_queue
= blk_init_queue(do_dasd_request
,
3107 &block
->request_queue_lock
);
3108 if (block
->request_queue
== NULL
)
3111 block
->request_queue
->queuedata
= block
;
3117 * Allocate and initialize request queue.
3119 static void dasd_setup_queue(struct dasd_block
*block
)
3123 if (block
->base
->features
& DASD_FEATURE_USERAW
) {
3125 * the max_blocks value for raw_track access is 256
3126 * it is higher than the native ECKD value because we
3127 * only need one ccw per track
3128 * so the max_hw_sectors are
3129 * 2048 x 512B = 1024kB = 16 tracks
3133 max
= block
->base
->discipline
->max_blocks
<< block
->s2b_shift
;
3135 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, block
->request_queue
);
3136 block
->request_queue
->limits
.max_dev_sectors
= max
;
3137 blk_queue_logical_block_size(block
->request_queue
,
3139 blk_queue_max_hw_sectors(block
->request_queue
, max
);
3140 blk_queue_max_segments(block
->request_queue
, -1L);
3141 /* with page sized segments we can translate each segement into
3144 blk_queue_max_segment_size(block
->request_queue
, PAGE_SIZE
);
3145 blk_queue_segment_boundary(block
->request_queue
, PAGE_SIZE
- 1);
3149 * Deactivate and free request queue.
3151 static void dasd_free_queue(struct dasd_block
*block
)
3153 if (block
->request_queue
) {
3154 blk_cleanup_queue(block
->request_queue
);
3155 block
->request_queue
= NULL
;
3160 * Flush request on the request queue.
3162 static void dasd_flush_request_queue(struct dasd_block
*block
)
3164 struct request
*req
;
3166 if (!block
->request_queue
)
3169 spin_lock_irq(&block
->request_queue_lock
);
3170 while ((req
= blk_fetch_request(block
->request_queue
)))
3171 __blk_end_request_all(req
, -EIO
);
3172 spin_unlock_irq(&block
->request_queue_lock
);
3175 static int dasd_open(struct block_device
*bdev
, fmode_t mode
)
3177 struct dasd_device
*base
;
3180 base
= dasd_device_from_gendisk(bdev
->bd_disk
);
3184 atomic_inc(&base
->block
->open_count
);
3185 if (test_bit(DASD_FLAG_OFFLINE
, &base
->flags
)) {
3190 if (!try_module_get(base
->discipline
->owner
)) {
3195 if (dasd_probeonly
) {
3196 dev_info(&base
->cdev
->dev
,
3197 "Accessing the DASD failed because it is in "
3198 "probeonly mode\n");
3203 if (base
->state
<= DASD_STATE_BASIC
) {
3204 DBF_DEV_EVENT(DBF_ERR
, base
, " %s",
3205 " Cannot open unrecognized device");
3210 if ((mode
& FMODE_WRITE
) &&
3211 (test_bit(DASD_FLAG_DEVICE_RO
, &base
->flags
) ||
3212 (base
->features
& DASD_FEATURE_READONLY
))) {
3217 dasd_put_device(base
);
3221 module_put(base
->discipline
->owner
);
3223 atomic_dec(&base
->block
->open_count
);
3224 dasd_put_device(base
);
3228 static void dasd_release(struct gendisk
*disk
, fmode_t mode
)
3230 struct dasd_device
*base
= dasd_device_from_gendisk(disk
);
3232 atomic_dec(&base
->block
->open_count
);
3233 module_put(base
->discipline
->owner
);
3234 dasd_put_device(base
);
3239 * Return disk geometry.
3241 static int dasd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
3243 struct dasd_device
*base
;
3245 base
= dasd_device_from_gendisk(bdev
->bd_disk
);
3249 if (!base
->discipline
||
3250 !base
->discipline
->fill_geometry
) {
3251 dasd_put_device(base
);
3254 base
->discipline
->fill_geometry(base
->block
, geo
);
3255 geo
->start
= get_start_sect(bdev
) >> base
->block
->s2b_shift
;
3256 dasd_put_device(base
);
3260 const struct block_device_operations
3261 dasd_device_operations
= {
3262 .owner
= THIS_MODULE
,
3264 .release
= dasd_release
,
3265 .ioctl
= dasd_ioctl
,
3266 .compat_ioctl
= dasd_ioctl
,
3267 .getgeo
= dasd_getgeo
,
3270 /*******************************************************************************
3271 * end of block device operations
3277 #ifdef CONFIG_PROC_FS
3281 if (dasd_page_cache
!= NULL
) {
3282 kmem_cache_destroy(dasd_page_cache
);
3283 dasd_page_cache
= NULL
;
3285 dasd_gendisk_exit();
3287 if (dasd_debug_area
!= NULL
) {
3288 debug_unregister(dasd_debug_area
);
3289 dasd_debug_area
= NULL
;
3291 dasd_statistics_removeroot();
3295 * SECTION: common functions for ccw_driver use
3299 * Is the device read-only?
3300 * Note that this function does not report the setting of the
3301 * readonly device attribute, but how it is configured in z/VM.
3303 int dasd_device_is_ro(struct dasd_device
*device
)
3305 struct ccw_dev_id dev_id
;
3306 struct diag210 diag_data
;
3311 ccw_device_get_id(device
->cdev
, &dev_id
);
3312 memset(&diag_data
, 0, sizeof(diag_data
));
3313 diag_data
.vrdcdvno
= dev_id
.devno
;
3314 diag_data
.vrdclen
= sizeof(diag_data
);
3315 rc
= diag210(&diag_data
);
3316 if (rc
== 0 || rc
== 2) {
3317 return diag_data
.vrdcvfla
& 0x80;
3319 DBF_EVENT(DBF_WARNING
, "diag210 failed for dev=%04x with rc=%d",
3324 EXPORT_SYMBOL_GPL(dasd_device_is_ro
);
3326 static void dasd_generic_auto_online(void *data
, async_cookie_t cookie
)
3328 struct ccw_device
*cdev
= data
;
3331 ret
= ccw_device_set_online(cdev
);
3333 pr_warn("%s: Setting the DASD online failed with rc=%d\n",
3334 dev_name(&cdev
->dev
), ret
);
3338 * Initial attempt at a probe function. this can be simplified once
3339 * the other detection code is gone.
3341 int dasd_generic_probe(struct ccw_device
*cdev
,
3342 struct dasd_discipline
*discipline
)
3346 ret
= dasd_add_sysfs_files(cdev
);
3348 DBF_EVENT_DEVID(DBF_WARNING
, cdev
, "%s",
3349 "dasd_generic_probe: could not add "
3353 cdev
->handler
= &dasd_int_handler
;
3356 * Automatically online either all dasd devices (dasd_autodetect)
3357 * or all devices specified with dasd= parameters during
3360 if ((dasd_get_feature(cdev
, DASD_FEATURE_INITIAL_ONLINE
) > 0 ) ||
3361 (dasd_autodetect
&& dasd_busid_known(dev_name(&cdev
->dev
)) != 0))
3362 async_schedule(dasd_generic_auto_online
, cdev
);
3365 EXPORT_SYMBOL_GPL(dasd_generic_probe
);
3368 * This will one day be called from a global not_oper handler.
3369 * It is also used by driver_unregister during module unload.
3371 void dasd_generic_remove(struct ccw_device
*cdev
)
3373 struct dasd_device
*device
;
3374 struct dasd_block
*block
;
3376 cdev
->handler
= NULL
;
3378 device
= dasd_device_from_cdev(cdev
);
3379 if (IS_ERR(device
)) {
3380 dasd_remove_sysfs_files(cdev
);
3383 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
) &&
3384 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
3385 /* Already doing offline processing */
3386 dasd_put_device(device
);
3387 dasd_remove_sysfs_files(cdev
);
3391 * This device is removed unconditionally. Set offline
3392 * flag to prevent dasd_open from opening it while it is
3393 * no quite down yet.
3395 dasd_set_target_state(device
, DASD_STATE_NEW
);
3396 /* dasd_delete_device destroys the device reference. */
3397 block
= device
->block
;
3398 dasd_delete_device(device
);
3400 * life cycle of block is bound to device, so delete it after
3401 * device was safely removed
3404 dasd_free_block(block
);
3406 dasd_remove_sysfs_files(cdev
);
3408 EXPORT_SYMBOL_GPL(dasd_generic_remove
);
3411 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
3412 * the device is detected for the first time and is supposed to be used
3413 * or the user has started activation through sysfs.
3415 int dasd_generic_set_online(struct ccw_device
*cdev
,
3416 struct dasd_discipline
*base_discipline
)
3418 struct dasd_discipline
*discipline
;
3419 struct dasd_device
*device
;
3422 /* first online clears initial online feature flag */
3423 dasd_set_feature(cdev
, DASD_FEATURE_INITIAL_ONLINE
, 0);
3424 device
= dasd_create_device(cdev
);
3426 return PTR_ERR(device
);
3428 discipline
= base_discipline
;
3429 if (device
->features
& DASD_FEATURE_USEDIAG
) {
3430 if (!dasd_diag_discipline_pointer
) {
3431 /* Try to load the required module. */
3432 rc
= request_module(DASD_DIAG_MOD
);
3434 pr_warn("%s Setting the DASD online failed "
3435 "because the required module %s "
3436 "could not be loaded (rc=%d)\n",
3437 dev_name(&cdev
->dev
), DASD_DIAG_MOD
,
3439 dasd_delete_device(device
);
3443 /* Module init could have failed, so check again here after
3444 * request_module(). */
3445 if (!dasd_diag_discipline_pointer
) {
3446 pr_warn("%s Setting the DASD online failed because of missing DIAG discipline\n",
3447 dev_name(&cdev
->dev
));
3448 dasd_delete_device(device
);
3451 discipline
= dasd_diag_discipline_pointer
;
3453 if (!try_module_get(base_discipline
->owner
)) {
3454 dasd_delete_device(device
);
3457 if (!try_module_get(discipline
->owner
)) {
3458 module_put(base_discipline
->owner
);
3459 dasd_delete_device(device
);
3462 device
->base_discipline
= base_discipline
;
3463 device
->discipline
= discipline
;
3465 /* check_device will allocate block device if necessary */
3466 rc
= discipline
->check_device(device
);
3468 pr_warn("%s Setting the DASD online with discipline %s failed with rc=%i\n",
3469 dev_name(&cdev
->dev
), discipline
->name
, rc
);
3470 module_put(discipline
->owner
);
3471 module_put(base_discipline
->owner
);
3472 dasd_delete_device(device
);
3476 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
3477 if (device
->state
<= DASD_STATE_KNOWN
) {
3478 pr_warn("%s Setting the DASD online failed because of a missing discipline\n",
3479 dev_name(&cdev
->dev
));
3481 dasd_set_target_state(device
, DASD_STATE_NEW
);
3483 dasd_free_block(device
->block
);
3484 dasd_delete_device(device
);
3486 pr_debug("dasd_generic device %s found\n",
3487 dev_name(&cdev
->dev
));
3489 wait_event(dasd_init_waitq
, _wait_for_device(device
));
3491 dasd_put_device(device
);
3494 EXPORT_SYMBOL_GPL(dasd_generic_set_online
);
3496 int dasd_generic_set_offline(struct ccw_device
*cdev
)
3498 struct dasd_device
*device
;
3499 struct dasd_block
*block
;
3500 int max_count
, open_count
, rc
;
3503 device
= dasd_device_from_cdev(cdev
);
3505 return PTR_ERR(device
);
3508 * We must make sure that this device is currently not in use.
3509 * The open_count is increased for every opener, that includes
3510 * the blkdev_get in dasd_scan_partitions. We are only interested
3511 * in the other openers.
3513 if (device
->block
) {
3514 max_count
= device
->block
->bdev
? 0 : -1;
3515 open_count
= atomic_read(&device
->block
->open_count
);
3516 if (open_count
> max_count
) {
3518 pr_warn("%s: The DASD cannot be set offline with open count %i\n",
3519 dev_name(&cdev
->dev
), open_count
);
3521 pr_warn("%s: The DASD cannot be set offline while it is in use\n",
3522 dev_name(&cdev
->dev
));
3523 clear_bit(DASD_FLAG_OFFLINE
, &device
->flags
);
3524 dasd_put_device(device
);
3529 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
3531 * safe offline already running
3532 * could only be called by normal offline so safe_offline flag
3533 * needs to be removed to run normal offline and kill all I/O
3535 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
3536 /* Already doing normal offline processing */
3537 dasd_put_device(device
);
3540 clear_bit(DASD_FLAG_SAFE_OFFLINE
, &device
->flags
);
3543 if (test_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
3544 /* Already doing offline processing */
3545 dasd_put_device(device
);
3550 * if safe_offline called set safe_offline_running flag and
3551 * clear safe_offline so that a call to normal offline
3552 * can overrun safe_offline processing
3554 if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE
, &device
->flags
) &&
3555 !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
3557 * If we want to set the device safe offline all IO operations
3558 * should be finished before continuing the offline process
3559 * so sync bdev first and then wait for our queues to become
3562 /* sync blockdev and partitions */
3563 rc
= fsync_bdev(device
->block
->bdev
);
3567 /* schedule device tasklet and wait for completion */
3568 dasd_schedule_device_bh(device
);
3569 rc
= wait_event_interruptible(shutdown_waitq
,
3570 _wait_for_empty_queues(device
));
3575 set_bit(DASD_FLAG_OFFLINE
, &device
->flags
);
3576 dasd_set_target_state(device
, DASD_STATE_NEW
);
3577 /* dasd_delete_device destroys the device reference. */
3578 block
= device
->block
;
3579 dasd_delete_device(device
);
3581 * life cycle of block is bound to device, so delete it after
3582 * device was safely removed
3585 dasd_free_block(block
);
3589 /* interrupted by signal */
3590 clear_bit(DASD_FLAG_SAFE_OFFLINE
, &device
->flags
);
3591 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
);
3592 clear_bit(DASD_FLAG_OFFLINE
, &device
->flags
);
3593 dasd_put_device(device
);
3596 EXPORT_SYMBOL_GPL(dasd_generic_set_offline
);
3598 int dasd_generic_last_path_gone(struct dasd_device
*device
)
3600 struct dasd_ccw_req
*cqr
;
3602 dev_warn(&device
->cdev
->dev
, "No operational channel path is left "
3603 "for the device\n");
3604 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s", "last path gone");
3605 /* First of all call extended error reporting. */
3606 dasd_eer_write(device
, NULL
, DASD_EER_NOPATH
);
3608 if (device
->state
< DASD_STATE_BASIC
)
3610 /* Device is active. We want to keep it. */
3611 list_for_each_entry(cqr
, &device
->ccw_queue
, devlist
)
3612 if ((cqr
->status
== DASD_CQR_IN_IO
) ||
3613 (cqr
->status
== DASD_CQR_CLEAR_PENDING
)) {
3614 cqr
->status
= DASD_CQR_QUEUED
;
3617 dasd_device_set_stop_bits(device
, DASD_STOPPED_DC_WAIT
);
3618 dasd_device_clear_timer(device
);
3619 dasd_schedule_device_bh(device
);
3622 EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone
);
3624 int dasd_generic_path_operational(struct dasd_device
*device
)
3626 dev_info(&device
->cdev
->dev
, "A channel path to the device has become "
3628 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s", "path operational");
3629 dasd_device_remove_stop_bits(device
, DASD_STOPPED_DC_WAIT
);
3630 if (device
->stopped
& DASD_UNRESUMED_PM
) {
3631 dasd_device_remove_stop_bits(device
, DASD_UNRESUMED_PM
);
3632 dasd_restore_device(device
);
3635 dasd_schedule_device_bh(device
);
3637 dasd_schedule_block_bh(device
->block
);
3639 if (!device
->stopped
)
3640 wake_up(&generic_waitq
);
3644 EXPORT_SYMBOL_GPL(dasd_generic_path_operational
);
3646 int dasd_generic_notify(struct ccw_device
*cdev
, int event
)
3648 struct dasd_device
*device
;
3651 device
= dasd_device_from_cdev_locked(cdev
);
3659 device
->path_data
.opm
= 0;
3660 device
->path_data
.ppm
= 0;
3661 device
->path_data
.npm
= 0;
3662 ret
= dasd_generic_last_path_gone(device
);
3666 if (device
->path_data
.opm
)
3667 ret
= dasd_generic_path_operational(device
);
3670 dasd_put_device(device
);
3673 EXPORT_SYMBOL_GPL(dasd_generic_notify
);
3675 void dasd_generic_path_event(struct ccw_device
*cdev
, int *path_event
)
3678 __u8 oldopm
, eventlpm
;
3679 struct dasd_device
*device
;
3681 device
= dasd_device_from_cdev_locked(cdev
);
3684 for (chp
= 0; chp
< 8; chp
++) {
3685 eventlpm
= 0x80 >> chp
;
3686 if (path_event
[chp
] & PE_PATH_GONE
) {
3687 oldopm
= device
->path_data
.opm
;
3688 device
->path_data
.opm
&= ~eventlpm
;
3689 device
->path_data
.ppm
&= ~eventlpm
;
3690 device
->path_data
.npm
&= ~eventlpm
;
3691 if (oldopm
&& !device
->path_data
.opm
) {
3692 dev_warn(&device
->cdev
->dev
,
3693 "No verified channel paths remain "
3694 "for the device\n");
3695 DBF_DEV_EVENT(DBF_WARNING
, device
,
3696 "%s", "last verified path gone");
3697 dasd_eer_write(device
, NULL
, DASD_EER_NOPATH
);
3698 dasd_device_set_stop_bits(device
,
3699 DASD_STOPPED_DC_WAIT
);
3702 if (path_event
[chp
] & PE_PATH_AVAILABLE
) {
3703 device
->path_data
.opm
&= ~eventlpm
;
3704 device
->path_data
.ppm
&= ~eventlpm
;
3705 device
->path_data
.npm
&= ~eventlpm
;
3706 device
->path_data
.tbvpm
|= eventlpm
;
3707 dasd_schedule_device_bh(device
);
3709 if (path_event
[chp
] & PE_PATHGROUP_ESTABLISHED
) {
3710 if (!(device
->path_data
.opm
& eventlpm
) &&
3711 !(device
->path_data
.tbvpm
& eventlpm
)) {
3713 * we can not establish a pathgroup on an
3714 * unavailable path, so trigger a path
3715 * verification first
3717 device
->path_data
.tbvpm
|= eventlpm
;
3718 dasd_schedule_device_bh(device
);
3720 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
3721 "Pathgroup re-established\n");
3722 if (device
->discipline
->kick_validate
)
3723 device
->discipline
->kick_validate(device
);
3726 dasd_put_device(device
);
3728 EXPORT_SYMBOL_GPL(dasd_generic_path_event
);
3730 int dasd_generic_verify_path(struct dasd_device
*device
, __u8 lpm
)
3732 if (!device
->path_data
.opm
&& lpm
) {
3733 device
->path_data
.opm
= lpm
;
3734 dasd_generic_path_operational(device
);
3736 device
->path_data
.opm
|= lpm
;
3739 EXPORT_SYMBOL_GPL(dasd_generic_verify_path
);
3742 int dasd_generic_pm_freeze(struct ccw_device
*cdev
)
3744 struct dasd_device
*device
= dasd_device_from_cdev(cdev
);
3745 struct list_head freeze_queue
;
3746 struct dasd_ccw_req
*cqr
, *n
;
3747 struct dasd_ccw_req
*refers
;
3751 return PTR_ERR(device
);
3753 /* mark device as suspended */
3754 set_bit(DASD_FLAG_SUSPENDED
, &device
->flags
);
3756 if (device
->discipline
->freeze
)
3757 rc
= device
->discipline
->freeze(device
);
3759 /* disallow new I/O */
3760 dasd_device_set_stop_bits(device
, DASD_STOPPED_PM
);
3762 /* clear active requests and requeue them to block layer if possible */
3763 INIT_LIST_HEAD(&freeze_queue
);
3764 spin_lock_irq(get_ccwdev_lock(cdev
));
3766 list_for_each_entry_safe(cqr
, n
, &device
->ccw_queue
, devlist
) {
3767 /* Check status and move request to flush_queue */
3768 if (cqr
->status
== DASD_CQR_IN_IO
) {
3769 rc
= device
->discipline
->term_IO(cqr
);
3771 /* unable to terminate requeust */
3772 dev_err(&device
->cdev
->dev
,
3773 "Unable to terminate request %p "
3774 "on suspend\n", cqr
);
3775 spin_unlock_irq(get_ccwdev_lock(cdev
));
3776 dasd_put_device(device
);
3780 list_move_tail(&cqr
->devlist
, &freeze_queue
);
3782 spin_unlock_irq(get_ccwdev_lock(cdev
));
3784 list_for_each_entry_safe(cqr
, n
, &freeze_queue
, devlist
) {
3785 wait_event(dasd_flush_wq
,
3786 (cqr
->status
!= DASD_CQR_CLEAR_PENDING
));
3787 if (cqr
->status
== DASD_CQR_CLEARED
)
3788 cqr
->status
= DASD_CQR_QUEUED
;
3790 /* requeue requests to blocklayer will only work for
3791 block device requests */
3792 if (_dasd_requeue_request(cqr
))
3795 /* remove requests from device and block queue */
3796 list_del_init(&cqr
->devlist
);
3797 while (cqr
->refers
!= NULL
) {
3798 refers
= cqr
->refers
;
3799 /* remove the request from the block queue */
3800 list_del(&cqr
->blocklist
);
3801 /* free the finished erp request */
3802 dasd_free_erp_request(cqr
, cqr
->memdev
);
3806 list_del_init(&cqr
->blocklist
);
3807 cqr
->block
->base
->discipline
->free_cp(
3808 cqr
, (struct request
*) cqr
->callback_data
);
3812 * if requests remain then they are internal request
3813 * and go back to the device queue
3815 if (!list_empty(&freeze_queue
)) {
3816 /* move freeze_queue to start of the ccw_queue */
3817 spin_lock_irq(get_ccwdev_lock(cdev
));
3818 list_splice_tail(&freeze_queue
, &device
->ccw_queue
);
3819 spin_unlock_irq(get_ccwdev_lock(cdev
));
3821 dasd_put_device(device
);
3824 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze
);
3826 int dasd_generic_restore_device(struct ccw_device
*cdev
)
3828 struct dasd_device
*device
= dasd_device_from_cdev(cdev
);
3832 return PTR_ERR(device
);
3834 /* allow new IO again */
3835 dasd_device_remove_stop_bits(device
,
3836 (DASD_STOPPED_PM
| DASD_UNRESUMED_PM
));
3838 dasd_schedule_device_bh(device
);
3841 * call discipline restore function
3842 * if device is stopped do nothing e.g. for disconnected devices
3844 if (device
->discipline
->restore
&& !(device
->stopped
))
3845 rc
= device
->discipline
->restore(device
);
3846 if (rc
|| device
->stopped
)
3848 * if the resume failed for the DASD we put it in
3849 * an UNRESUMED stop state
3851 device
->stopped
|= DASD_UNRESUMED_PM
;
3854 dasd_schedule_block_bh(device
->block
);
3856 clear_bit(DASD_FLAG_SUSPENDED
, &device
->flags
);
3857 dasd_put_device(device
);
3860 EXPORT_SYMBOL_GPL(dasd_generic_restore_device
);
3862 static struct dasd_ccw_req
*dasd_generic_build_rdc(struct dasd_device
*device
,
3864 int rdc_buffer_size
,
3867 struct dasd_ccw_req
*cqr
;
3869 unsigned long *idaw
;
3871 cqr
= dasd_smalloc_request(magic
, 1 /* RDC */, rdc_buffer_size
, device
);
3874 /* internal error 13 - Allocating the RDC request failed*/
3875 dev_err(&device
->cdev
->dev
,
3876 "An error occurred in the DASD device driver, "
3877 "reason=%s\n", "13");
3882 ccw
->cmd_code
= CCW_CMD_RDC
;
3883 if (idal_is_needed(rdc_buffer
, rdc_buffer_size
)) {
3884 idaw
= (unsigned long *) (cqr
->data
);
3885 ccw
->cda
= (__u32
)(addr_t
) idaw
;
3886 ccw
->flags
= CCW_FLAG_IDA
;
3887 idaw
= idal_create_words(idaw
, rdc_buffer
, rdc_buffer_size
);
3889 ccw
->cda
= (__u32
)(addr_t
) rdc_buffer
;
3893 ccw
->count
= rdc_buffer_size
;
3894 cqr
->startdev
= device
;
3895 cqr
->memdev
= device
;
3896 cqr
->expires
= 10*HZ
;
3898 cqr
->buildclk
= get_tod_clock();
3899 cqr
->status
= DASD_CQR_FILLED
;
3904 int dasd_generic_read_dev_chars(struct dasd_device
*device
, int magic
,
3905 void *rdc_buffer
, int rdc_buffer_size
)
3908 struct dasd_ccw_req
*cqr
;
3910 cqr
= dasd_generic_build_rdc(device
, rdc_buffer
, rdc_buffer_size
,
3913 return PTR_ERR(cqr
);
3915 ret
= dasd_sleep_on(cqr
);
3916 dasd_sfree_request(cqr
, cqr
->memdev
);
3919 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars
);
3922 * In command mode and transport mode we need to look for sense
3923 * data in different places. The sense data itself is allways
3924 * an array of 32 bytes, so we can unify the sense data access
3927 char *dasd_get_sense(struct irb
*irb
)
3929 struct tsb
*tsb
= NULL
;
3932 if (scsw_is_tm(&irb
->scsw
) && (irb
->scsw
.tm
.fcxs
== 0x01)) {
3933 if (irb
->scsw
.tm
.tcw
)
3934 tsb
= tcw_get_tsb((struct tcw
*)(unsigned long)
3936 if (tsb
&& tsb
->length
== 64 && tsb
->flags
)
3937 switch (tsb
->flags
& 0x07) {
3938 case 1: /* tsa_iostat */
3939 sense
= tsb
->tsa
.iostat
.sense
;
3941 case 2: /* tsa_ddpc */
3942 sense
= tsb
->tsa
.ddpc
.sense
;
3945 /* currently we don't use interrogate data */
3948 } else if (irb
->esw
.esw0
.erw
.cons
) {
3953 EXPORT_SYMBOL_GPL(dasd_get_sense
);
3955 void dasd_generic_shutdown(struct ccw_device
*cdev
)
3957 struct dasd_device
*device
;
3959 device
= dasd_device_from_cdev(cdev
);
3964 dasd_schedule_block_bh(device
->block
);
3966 dasd_schedule_device_bh(device
);
3968 wait_event(shutdown_waitq
, _wait_for_empty_queues(device
));
3970 EXPORT_SYMBOL_GPL(dasd_generic_shutdown
);
3972 static int __init
dasd_init(void)
3976 init_waitqueue_head(&dasd_init_waitq
);
3977 init_waitqueue_head(&dasd_flush_wq
);
3978 init_waitqueue_head(&generic_waitq
);
3979 init_waitqueue_head(&shutdown_waitq
);
3981 /* register 'common' DASD debug area, used for all DBF_XXX calls */
3982 dasd_debug_area
= debug_register("dasd", 1, 1, 8 * sizeof(long));
3983 if (dasd_debug_area
== NULL
) {
3987 debug_register_view(dasd_debug_area
, &debug_sprintf_view
);
3988 debug_set_level(dasd_debug_area
, DBF_WARNING
);
3990 DBF_EVENT(DBF_EMERG
, "%s", "debug area created");
3992 dasd_diag_discipline_pointer
= NULL
;
3994 dasd_statistics_createroot();
3996 rc
= dasd_devmap_init();
3999 rc
= dasd_gendisk_init();
4005 rc
= dasd_eer_init();
4008 #ifdef CONFIG_PROC_FS
4009 rc
= dasd_proc_init();
4016 pr_info("The DASD device driver could not be initialized\n");
4021 module_init(dasd_init
);
4022 module_exit(dasd_exit
);