1 // SPDX-License-Identifier: GPL-2.0
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * Copyright IBM Corp. 1999, 2009
11 #define KMSG_COMPONENT "dasd"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14 #include <linux/kmod.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/ctype.h>
18 #include <linux/major.h>
19 #include <linux/slab.h>
20 #include <linux/hdreg.h>
21 #include <linux/async.h>
22 #include <linux/mutex.h>
23 #include <linux/debugfs.h>
24 #include <linux/seq_file.h>
25 #include <linux/vmalloc.h>
27 #include <asm/ccwdev.h>
28 #include <asm/ebcdic.h>
29 #include <asm/idals.h>
34 #define PRINTK_HEADER "dasd:"
38 * SECTION: Constant definitions to be used within this file
40 #define DASD_CHANQ_MAX_SIZE 4
42 #define DASD_DIAG_MOD "dasd_diag_mod"
45 * SECTION: exported variables of dasd.c
47 debug_info_t
*dasd_debug_area
;
48 EXPORT_SYMBOL(dasd_debug_area
);
49 static struct dentry
*dasd_debugfs_root_entry
;
50 struct dasd_discipline
*dasd_diag_discipline_pointer
;
51 EXPORT_SYMBOL(dasd_diag_discipline_pointer
);
52 void dasd_int_handler(struct ccw_device
*, unsigned long, struct irb
*);
54 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
55 MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
56 " Copyright IBM Corp. 2000");
57 MODULE_SUPPORTED_DEVICE("dasd");
58 MODULE_LICENSE("GPL");
61 * SECTION: prototypes for static functions of dasd.c
63 static int dasd_alloc_queue(struct dasd_block
*);
64 static void dasd_setup_queue(struct dasd_block
*);
65 static void dasd_free_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 do_requeue_requests(struct work_struct
*);
73 static void dasd_return_cqr_cb(struct dasd_ccw_req
*, void *);
74 static void dasd_device_timeout(struct timer_list
*);
75 static void dasd_block_timeout(struct timer_list
*);
76 static void __dasd_process_erp(struct dasd_device
*, struct dasd_ccw_req
*);
77 static void dasd_profile_init(struct dasd_profile
*, struct dentry
*);
78 static void dasd_profile_exit(struct dasd_profile
*);
79 static void dasd_hosts_init(struct dentry
*, struct dasd_device
*);
80 static void dasd_hosts_exit(struct dasd_device
*);
83 * SECTION: Operations on the device structure.
85 static wait_queue_head_t dasd_init_waitq
;
86 static wait_queue_head_t dasd_flush_wq
;
87 static wait_queue_head_t generic_waitq
;
88 static wait_queue_head_t shutdown_waitq
;
91 * Allocate memory for a new device structure.
93 struct dasd_device
*dasd_alloc_device(void)
95 struct dasd_device
*device
;
97 device
= kzalloc(sizeof(struct dasd_device
), GFP_ATOMIC
);
99 return ERR_PTR(-ENOMEM
);
101 /* Get two pages for normal block device operations. */
102 device
->ccw_mem
= (void *) __get_free_pages(GFP_ATOMIC
| GFP_DMA
, 1);
103 if (!device
->ccw_mem
) {
105 return ERR_PTR(-ENOMEM
);
107 /* Get one page for error recovery. */
108 device
->erp_mem
= (void *) get_zeroed_page(GFP_ATOMIC
| GFP_DMA
);
109 if (!device
->erp_mem
) {
110 free_pages((unsigned long) device
->ccw_mem
, 1);
112 return ERR_PTR(-ENOMEM
);
115 dasd_init_chunklist(&device
->ccw_chunks
, device
->ccw_mem
, PAGE_SIZE
*2);
116 dasd_init_chunklist(&device
->erp_chunks
, device
->erp_mem
, PAGE_SIZE
);
117 spin_lock_init(&device
->mem_lock
);
118 atomic_set(&device
->tasklet_scheduled
, 0);
119 tasklet_init(&device
->tasklet
,
120 (void (*)(unsigned long)) dasd_device_tasklet
,
121 (unsigned long) device
);
122 INIT_LIST_HEAD(&device
->ccw_queue
);
123 timer_setup(&device
->timer
, dasd_device_timeout
, 0);
124 INIT_WORK(&device
->kick_work
, do_kick_device
);
125 INIT_WORK(&device
->restore_device
, do_restore_device
);
126 INIT_WORK(&device
->reload_device
, do_reload_device
);
127 INIT_WORK(&device
->requeue_requests
, do_requeue_requests
);
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 atomic_set(&block
->tasklet_scheduled
, 0);
160 tasklet_init(&block
->tasklet
,
161 (void (*)(unsigned long)) dasd_block_tasklet
,
162 (unsigned long) block
);
163 INIT_LIST_HEAD(&block
->ccw_queue
);
164 spin_lock_init(&block
->queue_lock
);
165 timer_setup(&block
->timer
, dasd_block_timeout
, 0);
166 spin_lock_init(&block
->profile
.lock
);
170 EXPORT_SYMBOL_GPL(dasd_alloc_block
);
173 * Free memory of a device structure.
175 void dasd_free_block(struct dasd_block
*block
)
179 EXPORT_SYMBOL_GPL(dasd_free_block
);
182 * Make a new device known to the system.
184 static int dasd_state_new_to_known(struct dasd_device
*device
)
189 * As long as the device is not in state DASD_STATE_NEW we want to
190 * keep the reference count > 0.
192 dasd_get_device(device
);
195 rc
= dasd_alloc_queue(device
->block
);
197 dasd_put_device(device
);
201 device
->state
= DASD_STATE_KNOWN
;
206 * Let the system forget about a device.
208 static int dasd_state_known_to_new(struct dasd_device
*device
)
210 /* Disable extended error reporting for this device. */
211 dasd_eer_disable(device
);
212 device
->state
= DASD_STATE_NEW
;
215 dasd_free_queue(device
->block
);
217 /* Give up reference we took in dasd_state_new_to_known. */
218 dasd_put_device(device
);
222 static struct dentry
*dasd_debugfs_setup(const char *name
,
223 struct dentry
*base_dentry
)
229 pde
= debugfs_create_dir(name
, base_dentry
);
230 if (!pde
|| IS_ERR(pde
))
236 * Request the irq line for the device.
238 static int dasd_state_known_to_basic(struct dasd_device
*device
)
240 struct dasd_block
*block
= device
->block
;
243 /* Allocate and register gendisk structure. */
245 rc
= dasd_gendisk_alloc(block
);
248 block
->debugfs_dentry
=
249 dasd_debugfs_setup(block
->gdp
->disk_name
,
250 dasd_debugfs_root_entry
);
251 dasd_profile_init(&block
->profile
, block
->debugfs_dentry
);
252 if (dasd_global_profile_level
== DASD_PROFILE_ON
)
253 dasd_profile_on(&device
->block
->profile
);
255 device
->debugfs_dentry
=
256 dasd_debugfs_setup(dev_name(&device
->cdev
->dev
),
257 dasd_debugfs_root_entry
);
258 dasd_profile_init(&device
->profile
, device
->debugfs_dentry
);
259 dasd_hosts_init(device
->debugfs_dentry
, device
);
261 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
262 device
->debug_area
= debug_register(dev_name(&device
->cdev
->dev
), 4, 1,
264 debug_register_view(device
->debug_area
, &debug_sprintf_view
);
265 debug_set_level(device
->debug_area
, DBF_WARNING
);
266 DBF_DEV_EVENT(DBF_EMERG
, device
, "%s", "debug area created");
268 device
->state
= DASD_STATE_BASIC
;
274 * Release the irq line for the device. Terminate any running i/o.
276 static int dasd_state_basic_to_known(struct dasd_device
*device
)
280 if (device
->discipline
->basic_to_known
) {
281 rc
= device
->discipline
->basic_to_known(device
);
287 dasd_profile_exit(&device
->block
->profile
);
288 debugfs_remove(device
->block
->debugfs_dentry
);
289 dasd_gendisk_free(device
->block
);
290 dasd_block_clear_timer(device
->block
);
292 rc
= dasd_flush_device_queue(device
);
295 dasd_device_clear_timer(device
);
296 dasd_profile_exit(&device
->profile
);
297 dasd_hosts_exit(device
);
298 debugfs_remove(device
->debugfs_dentry
);
299 DBF_DEV_EVENT(DBF_EMERG
, device
, "%p debug area deleted", device
);
300 if (device
->debug_area
!= NULL
) {
301 debug_unregister(device
->debug_area
);
302 device
->debug_area
= NULL
;
304 device
->state
= DASD_STATE_KNOWN
;
309 * Do the initial analysis. The do_analysis function may return
310 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
311 * until the discipline decides to continue the startup sequence
312 * by calling the function dasd_change_state. The eckd disciplines
313 * uses this to start a ccw that detects the format. The completion
314 * interrupt for this detection ccw uses the kernel event daemon to
315 * trigger the call to dasd_change_state. All this is done in the
316 * discipline code, see dasd_eckd.c.
317 * After the analysis ccw is done (do_analysis returned 0) the block
319 * In case the analysis returns an error, the device setup is stopped
320 * (a fake disk was already added to allow formatting).
322 static int dasd_state_basic_to_ready(struct dasd_device
*device
)
325 struct dasd_block
*block
;
326 struct gendisk
*disk
;
329 block
= device
->block
;
330 /* make disk known with correct capacity */
332 if (block
->base
->discipline
->do_analysis
!= NULL
)
333 rc
= block
->base
->discipline
->do_analysis(block
);
336 device
->state
= DASD_STATE_UNFMT
;
337 disk
= device
->block
->gdp
;
338 kobject_uevent(&disk_to_dev(disk
)->kobj
,
344 dasd_setup_queue(block
);
345 set_capacity(block
->gdp
,
346 block
->blocks
<< block
->s2b_shift
);
347 device
->state
= DASD_STATE_READY
;
348 rc
= dasd_scan_partitions(block
);
350 device
->state
= DASD_STATE_BASIC
;
354 device
->state
= DASD_STATE_READY
;
357 if (device
->discipline
->basic_to_ready
)
358 rc
= device
->discipline
->basic_to_ready(device
);
363 int _wait_for_empty_queues(struct dasd_device
*device
)
366 return list_empty(&device
->ccw_queue
) &&
367 list_empty(&device
->block
->ccw_queue
);
369 return list_empty(&device
->ccw_queue
);
373 * Remove device from block device layer. Destroy dirty buffers.
374 * Forget format information. Check if the target level is basic
375 * and if it is create fake disk for formatting.
377 static int dasd_state_ready_to_basic(struct dasd_device
*device
)
381 device
->state
= DASD_STATE_BASIC
;
383 struct dasd_block
*block
= device
->block
;
384 rc
= dasd_flush_block_queue(block
);
386 device
->state
= DASD_STATE_READY
;
389 dasd_destroy_partitions(block
);
392 block
->s2b_shift
= 0;
400 static int dasd_state_unfmt_to_basic(struct dasd_device
*device
)
402 device
->state
= DASD_STATE_BASIC
;
407 * Make the device online and schedule the bottom half to start
408 * the requeueing of requests from the linux request queue to the
412 dasd_state_ready_to_online(struct dasd_device
* device
)
414 struct gendisk
*disk
;
415 struct disk_part_iter piter
;
416 struct hd_struct
*part
;
418 device
->state
= DASD_STATE_ONLINE
;
420 dasd_schedule_block_bh(device
->block
);
421 if ((device
->features
& DASD_FEATURE_USERAW
)) {
422 disk
= device
->block
->gdp
;
423 kobject_uevent(&disk_to_dev(disk
)->kobj
, KOBJ_CHANGE
);
426 disk
= device
->block
->bdev
->bd_disk
;
427 disk_part_iter_init(&piter
, disk
, DISK_PITER_INCL_PART0
);
428 while ((part
= disk_part_iter_next(&piter
)))
429 kobject_uevent(&part_to_dev(part
)->kobj
, KOBJ_CHANGE
);
430 disk_part_iter_exit(&piter
);
436 * Stop the requeueing of requests again.
438 static int dasd_state_online_to_ready(struct dasd_device
*device
)
441 struct gendisk
*disk
;
442 struct disk_part_iter piter
;
443 struct hd_struct
*part
;
445 if (device
->discipline
->online_to_ready
) {
446 rc
= device
->discipline
->online_to_ready(device
);
451 device
->state
= DASD_STATE_READY
;
452 if (device
->block
&& !(device
->features
& DASD_FEATURE_USERAW
)) {
453 disk
= device
->block
->bdev
->bd_disk
;
454 disk_part_iter_init(&piter
, disk
, DISK_PITER_INCL_PART0
);
455 while ((part
= disk_part_iter_next(&piter
)))
456 kobject_uevent(&part_to_dev(part
)->kobj
, KOBJ_CHANGE
);
457 disk_part_iter_exit(&piter
);
463 * Device startup state changes.
465 static int dasd_increase_state(struct dasd_device
*device
)
470 if (device
->state
== DASD_STATE_NEW
&&
471 device
->target
>= DASD_STATE_KNOWN
)
472 rc
= dasd_state_new_to_known(device
);
475 device
->state
== DASD_STATE_KNOWN
&&
476 device
->target
>= DASD_STATE_BASIC
)
477 rc
= dasd_state_known_to_basic(device
);
480 device
->state
== DASD_STATE_BASIC
&&
481 device
->target
>= DASD_STATE_READY
)
482 rc
= dasd_state_basic_to_ready(device
);
485 device
->state
== DASD_STATE_UNFMT
&&
486 device
->target
> DASD_STATE_UNFMT
)
490 device
->state
== DASD_STATE_READY
&&
491 device
->target
>= DASD_STATE_ONLINE
)
492 rc
= dasd_state_ready_to_online(device
);
498 * Device shutdown state changes.
500 static int dasd_decrease_state(struct dasd_device
*device
)
505 if (device
->state
== DASD_STATE_ONLINE
&&
506 device
->target
<= DASD_STATE_READY
)
507 rc
= dasd_state_online_to_ready(device
);
510 device
->state
== DASD_STATE_READY
&&
511 device
->target
<= DASD_STATE_BASIC
)
512 rc
= dasd_state_ready_to_basic(device
);
515 device
->state
== DASD_STATE_UNFMT
&&
516 device
->target
<= DASD_STATE_BASIC
)
517 rc
= dasd_state_unfmt_to_basic(device
);
520 device
->state
== DASD_STATE_BASIC
&&
521 device
->target
<= DASD_STATE_KNOWN
)
522 rc
= dasd_state_basic_to_known(device
);
525 device
->state
== DASD_STATE_KNOWN
&&
526 device
->target
<= DASD_STATE_NEW
)
527 rc
= dasd_state_known_to_new(device
);
533 * This is the main startup/shutdown routine.
535 static void dasd_change_state(struct dasd_device
*device
)
539 if (device
->state
== device
->target
)
540 /* Already where we want to go today... */
542 if (device
->state
< device
->target
)
543 rc
= dasd_increase_state(device
);
545 rc
= dasd_decrease_state(device
);
549 device
->target
= device
->state
;
551 /* let user-space know that the device status changed */
552 kobject_uevent(&device
->cdev
->dev
.kobj
, KOBJ_CHANGE
);
554 if (device
->state
== device
->target
)
555 wake_up(&dasd_init_waitq
);
559 * Kick starter for devices that did not complete the startup/shutdown
560 * procedure or were sleeping because of a pending state.
561 * dasd_kick_device will schedule a call do do_kick_device to the kernel
564 static void do_kick_device(struct work_struct
*work
)
566 struct dasd_device
*device
= container_of(work
, struct dasd_device
, kick_work
);
567 mutex_lock(&device
->state_mutex
);
568 dasd_change_state(device
);
569 mutex_unlock(&device
->state_mutex
);
570 dasd_schedule_device_bh(device
);
571 dasd_put_device(device
);
574 void dasd_kick_device(struct dasd_device
*device
)
576 dasd_get_device(device
);
577 /* queue call to dasd_kick_device to the kernel event daemon. */
578 if (!schedule_work(&device
->kick_work
))
579 dasd_put_device(device
);
581 EXPORT_SYMBOL(dasd_kick_device
);
584 * dasd_reload_device will schedule a call do do_reload_device to the kernel
587 static void do_reload_device(struct work_struct
*work
)
589 struct dasd_device
*device
= container_of(work
, struct dasd_device
,
591 device
->discipline
->reload(device
);
592 dasd_put_device(device
);
595 void dasd_reload_device(struct dasd_device
*device
)
597 dasd_get_device(device
);
598 /* queue call to dasd_reload_device to the kernel event daemon. */
599 if (!schedule_work(&device
->reload_device
))
600 dasd_put_device(device
);
602 EXPORT_SYMBOL(dasd_reload_device
);
605 * dasd_restore_device will schedule a call do do_restore_device to the kernel
608 static void do_restore_device(struct work_struct
*work
)
610 struct dasd_device
*device
= container_of(work
, struct dasd_device
,
612 device
->cdev
->drv
->restore(device
->cdev
);
613 dasd_put_device(device
);
616 void dasd_restore_device(struct dasd_device
*device
)
618 dasd_get_device(device
);
619 /* queue call to dasd_restore_device to the kernel event daemon. */
620 if (!schedule_work(&device
->restore_device
))
621 dasd_put_device(device
);
625 * Set the target state for a device and starts the state change.
627 void dasd_set_target_state(struct dasd_device
*device
, int target
)
629 dasd_get_device(device
);
630 mutex_lock(&device
->state_mutex
);
631 /* If we are in probeonly mode stop at DASD_STATE_READY. */
632 if (dasd_probeonly
&& target
> DASD_STATE_READY
)
633 target
= DASD_STATE_READY
;
634 if (device
->target
!= target
) {
635 if (device
->state
== target
)
636 wake_up(&dasd_init_waitq
);
637 device
->target
= target
;
639 if (device
->state
!= device
->target
)
640 dasd_change_state(device
);
641 mutex_unlock(&device
->state_mutex
);
642 dasd_put_device(device
);
644 EXPORT_SYMBOL(dasd_set_target_state
);
647 * Enable devices with device numbers in [from..to].
649 static inline int _wait_for_device(struct dasd_device
*device
)
651 return (device
->state
== device
->target
);
654 void dasd_enable_device(struct dasd_device
*device
)
656 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
657 if (device
->state
<= DASD_STATE_KNOWN
)
658 /* No discipline for device found. */
659 dasd_set_target_state(device
, DASD_STATE_NEW
);
660 /* Now wait for the devices to come up. */
661 wait_event(dasd_init_waitq
, _wait_for_device(device
));
663 dasd_reload_device(device
);
664 if (device
->discipline
->kick_validate
)
665 device
->discipline
->kick_validate(device
);
667 EXPORT_SYMBOL(dasd_enable_device
);
670 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
673 unsigned int dasd_global_profile_level
= DASD_PROFILE_OFF
;
675 #ifdef CONFIG_DASD_PROFILE
676 struct dasd_profile dasd_global_profile
= {
677 .lock
= __SPIN_LOCK_UNLOCKED(dasd_global_profile
.lock
),
679 static struct dentry
*dasd_debugfs_global_entry
;
682 * Add profiling information for cqr before execution.
684 static void dasd_profile_start(struct dasd_block
*block
,
685 struct dasd_ccw_req
*cqr
,
689 unsigned int counter
;
690 struct dasd_device
*device
;
692 /* count the length of the chanq for statistics */
694 if (dasd_global_profile_level
|| block
->profile
.data
)
695 list_for_each(l
, &block
->ccw_queue
)
699 spin_lock(&dasd_global_profile
.lock
);
700 if (dasd_global_profile
.data
) {
701 dasd_global_profile
.data
->dasd_io_nr_req
[counter
]++;
702 if (rq_data_dir(req
) == READ
)
703 dasd_global_profile
.data
->dasd_read_nr_req
[counter
]++;
705 spin_unlock(&dasd_global_profile
.lock
);
707 spin_lock(&block
->profile
.lock
);
708 if (block
->profile
.data
) {
709 block
->profile
.data
->dasd_io_nr_req
[counter
]++;
710 if (rq_data_dir(req
) == READ
)
711 block
->profile
.data
->dasd_read_nr_req
[counter
]++;
713 spin_unlock(&block
->profile
.lock
);
716 * We count the request for the start device, even though it may run on
717 * some other device due to error recovery. This way we make sure that
718 * we count each request only once.
720 device
= cqr
->startdev
;
721 if (device
->profile
.data
) {
722 counter
= 1; /* request is not yet queued on the start device */
723 list_for_each(l
, &device
->ccw_queue
)
727 spin_lock(&device
->profile
.lock
);
728 if (device
->profile
.data
) {
729 device
->profile
.data
->dasd_io_nr_req
[counter
]++;
730 if (rq_data_dir(req
) == READ
)
731 device
->profile
.data
->dasd_read_nr_req
[counter
]++;
733 spin_unlock(&device
->profile
.lock
);
737 * Add profiling information for cqr after execution.
740 #define dasd_profile_counter(value, index) \
742 for (index = 0; index < 31 && value >> (2+index); index++) \
746 static void dasd_profile_end_add_data(struct dasd_profile_info
*data
,
759 /* in case of an overflow, reset the whole profile */
760 if (data
->dasd_io_reqs
== UINT_MAX
) {
761 memset(data
, 0, sizeof(*data
));
762 ktime_get_real_ts64(&data
->starttod
);
764 data
->dasd_io_reqs
++;
765 data
->dasd_io_sects
+= sectors
;
767 data
->dasd_io_alias
++;
771 data
->dasd_io_secs
[sectors_ind
]++;
772 data
->dasd_io_times
[tottime_ind
]++;
773 data
->dasd_io_timps
[tottimeps_ind
]++;
774 data
->dasd_io_time1
[strtime_ind
]++;
775 data
->dasd_io_time2
[irqtime_ind
]++;
776 data
->dasd_io_time2ps
[irqtimeps_ind
]++;
777 data
->dasd_io_time3
[endtime_ind
]++;
780 data
->dasd_read_reqs
++;
781 data
->dasd_read_sects
+= sectors
;
783 data
->dasd_read_alias
++;
785 data
->dasd_read_tpm
++;
786 data
->dasd_read_secs
[sectors_ind
]++;
787 data
->dasd_read_times
[tottime_ind
]++;
788 data
->dasd_read_time1
[strtime_ind
]++;
789 data
->dasd_read_time2
[irqtime_ind
]++;
790 data
->dasd_read_time3
[endtime_ind
]++;
794 static void dasd_profile_end(struct dasd_block
*block
,
795 struct dasd_ccw_req
*cqr
,
798 unsigned long strtime
, irqtime
, endtime
, tottime
;
799 unsigned long tottimeps
, sectors
;
800 struct dasd_device
*device
;
801 int sectors_ind
, tottime_ind
, tottimeps_ind
, strtime_ind
;
802 int irqtime_ind
, irqtimeps_ind
, endtime_ind
;
803 struct dasd_profile_info
*data
;
805 device
= cqr
->startdev
;
806 if (!(dasd_global_profile_level
||
807 block
->profile
.data
||
808 device
->profile
.data
))
811 sectors
= blk_rq_sectors(req
);
812 if (!cqr
->buildclk
|| !cqr
->startclk
||
813 !cqr
->stopclk
|| !cqr
->endclk
||
817 strtime
= ((cqr
->startclk
- cqr
->buildclk
) >> 12);
818 irqtime
= ((cqr
->stopclk
- cqr
->startclk
) >> 12);
819 endtime
= ((cqr
->endclk
- cqr
->stopclk
) >> 12);
820 tottime
= ((cqr
->endclk
- cqr
->buildclk
) >> 12);
821 tottimeps
= tottime
/ sectors
;
823 dasd_profile_counter(sectors
, sectors_ind
);
824 dasd_profile_counter(tottime
, tottime_ind
);
825 dasd_profile_counter(tottimeps
, tottimeps_ind
);
826 dasd_profile_counter(strtime
, strtime_ind
);
827 dasd_profile_counter(irqtime
, irqtime_ind
);
828 dasd_profile_counter(irqtime
/ sectors
, irqtimeps_ind
);
829 dasd_profile_counter(endtime
, endtime_ind
);
831 spin_lock(&dasd_global_profile
.lock
);
832 if (dasd_global_profile
.data
) {
833 data
= dasd_global_profile
.data
;
834 data
->dasd_sum_times
+= tottime
;
835 data
->dasd_sum_time_str
+= strtime
;
836 data
->dasd_sum_time_irq
+= irqtime
;
837 data
->dasd_sum_time_end
+= endtime
;
838 dasd_profile_end_add_data(dasd_global_profile
.data
,
839 cqr
->startdev
!= block
->base
,
841 rq_data_dir(req
) == READ
,
842 sectors
, sectors_ind
, tottime_ind
,
843 tottimeps_ind
, strtime_ind
,
844 irqtime_ind
, irqtimeps_ind
,
847 spin_unlock(&dasd_global_profile
.lock
);
849 spin_lock(&block
->profile
.lock
);
850 if (block
->profile
.data
) {
851 data
= block
->profile
.data
;
852 data
->dasd_sum_times
+= tottime
;
853 data
->dasd_sum_time_str
+= strtime
;
854 data
->dasd_sum_time_irq
+= irqtime
;
855 data
->dasd_sum_time_end
+= endtime
;
856 dasd_profile_end_add_data(block
->profile
.data
,
857 cqr
->startdev
!= block
->base
,
859 rq_data_dir(req
) == READ
,
860 sectors
, sectors_ind
, tottime_ind
,
861 tottimeps_ind
, strtime_ind
,
862 irqtime_ind
, irqtimeps_ind
,
865 spin_unlock(&block
->profile
.lock
);
867 spin_lock(&device
->profile
.lock
);
868 if (device
->profile
.data
) {
869 data
= device
->profile
.data
;
870 data
->dasd_sum_times
+= tottime
;
871 data
->dasd_sum_time_str
+= strtime
;
872 data
->dasd_sum_time_irq
+= irqtime
;
873 data
->dasd_sum_time_end
+= endtime
;
874 dasd_profile_end_add_data(device
->profile
.data
,
875 cqr
->startdev
!= block
->base
,
877 rq_data_dir(req
) == READ
,
878 sectors
, sectors_ind
, tottime_ind
,
879 tottimeps_ind
, strtime_ind
,
880 irqtime_ind
, irqtimeps_ind
,
883 spin_unlock(&device
->profile
.lock
);
886 void dasd_profile_reset(struct dasd_profile
*profile
)
888 struct dasd_profile_info
*data
;
890 spin_lock_bh(&profile
->lock
);
891 data
= profile
->data
;
893 spin_unlock_bh(&profile
->lock
);
896 memset(data
, 0, sizeof(*data
));
897 ktime_get_real_ts64(&data
->starttod
);
898 spin_unlock_bh(&profile
->lock
);
901 int dasd_profile_on(struct dasd_profile
*profile
)
903 struct dasd_profile_info
*data
;
905 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
908 spin_lock_bh(&profile
->lock
);
910 spin_unlock_bh(&profile
->lock
);
914 ktime_get_real_ts64(&data
->starttod
);
915 profile
->data
= data
;
916 spin_unlock_bh(&profile
->lock
);
920 void dasd_profile_off(struct dasd_profile
*profile
)
922 spin_lock_bh(&profile
->lock
);
923 kfree(profile
->data
);
924 profile
->data
= NULL
;
925 spin_unlock_bh(&profile
->lock
);
928 char *dasd_get_user_string(const char __user
*user_buf
, size_t user_len
)
932 buffer
= vmalloc(user_len
+ 1);
934 return ERR_PTR(-ENOMEM
);
935 if (copy_from_user(buffer
, user_buf
, user_len
) != 0) {
937 return ERR_PTR(-EFAULT
);
939 /* got the string, now strip linefeed. */
940 if (buffer
[user_len
- 1] == '\n')
941 buffer
[user_len
- 1] = 0;
943 buffer
[user_len
] = 0;
947 static ssize_t
dasd_stats_write(struct file
*file
,
948 const char __user
*user_buf
,
949 size_t user_len
, loff_t
*pos
)
953 struct seq_file
*m
= (struct seq_file
*)file
->private_data
;
954 struct dasd_profile
*prof
= m
->private;
956 if (user_len
> 65536)
958 buffer
= dasd_get_user_string(user_buf
, user_len
);
960 return PTR_ERR(buffer
);
962 str
= skip_spaces(buffer
);
964 if (strncmp(str
, "reset", 5) == 0) {
965 dasd_profile_reset(prof
);
966 } else if (strncmp(str
, "on", 2) == 0) {
967 rc
= dasd_profile_on(prof
);
971 if (prof
== &dasd_global_profile
) {
972 dasd_profile_reset(prof
);
973 dasd_global_profile_level
= DASD_PROFILE_GLOBAL_ONLY
;
975 } else if (strncmp(str
, "off", 3) == 0) {
976 if (prof
== &dasd_global_profile
)
977 dasd_global_profile_level
= DASD_PROFILE_OFF
;
978 dasd_profile_off(prof
);
986 static void dasd_stats_array(struct seq_file
*m
, unsigned int *array
)
990 for (i
= 0; i
< 32; i
++)
991 seq_printf(m
, "%u ", array
[i
]);
995 static void dasd_stats_seq_print(struct seq_file
*m
,
996 struct dasd_profile_info
*data
)
998 seq_printf(m
, "start_time %lld.%09ld\n",
999 (s64
)data
->starttod
.tv_sec
, data
->starttod
.tv_nsec
);
1000 seq_printf(m
, "total_requests %u\n", data
->dasd_io_reqs
);
1001 seq_printf(m
, "total_sectors %u\n", data
->dasd_io_sects
);
1002 seq_printf(m
, "total_pav %u\n", data
->dasd_io_alias
);
1003 seq_printf(m
, "total_hpf %u\n", data
->dasd_io_tpm
);
1004 seq_printf(m
, "avg_total %lu\n", data
->dasd_io_reqs
?
1005 data
->dasd_sum_times
/ data
->dasd_io_reqs
: 0UL);
1006 seq_printf(m
, "avg_build_to_ssch %lu\n", data
->dasd_io_reqs
?
1007 data
->dasd_sum_time_str
/ data
->dasd_io_reqs
: 0UL);
1008 seq_printf(m
, "avg_ssch_to_irq %lu\n", data
->dasd_io_reqs
?
1009 data
->dasd_sum_time_irq
/ data
->dasd_io_reqs
: 0UL);
1010 seq_printf(m
, "avg_irq_to_end %lu\n", data
->dasd_io_reqs
?
1011 data
->dasd_sum_time_end
/ data
->dasd_io_reqs
: 0UL);
1012 seq_puts(m
, "histogram_sectors ");
1013 dasd_stats_array(m
, data
->dasd_io_secs
);
1014 seq_puts(m
, "histogram_io_times ");
1015 dasd_stats_array(m
, data
->dasd_io_times
);
1016 seq_puts(m
, "histogram_io_times_weighted ");
1017 dasd_stats_array(m
, data
->dasd_io_timps
);
1018 seq_puts(m
, "histogram_time_build_to_ssch ");
1019 dasd_stats_array(m
, data
->dasd_io_time1
);
1020 seq_puts(m
, "histogram_time_ssch_to_irq ");
1021 dasd_stats_array(m
, data
->dasd_io_time2
);
1022 seq_puts(m
, "histogram_time_ssch_to_irq_weighted ");
1023 dasd_stats_array(m
, data
->dasd_io_time2ps
);
1024 seq_puts(m
, "histogram_time_irq_to_end ");
1025 dasd_stats_array(m
, data
->dasd_io_time3
);
1026 seq_puts(m
, "histogram_ccw_queue_length ");
1027 dasd_stats_array(m
, data
->dasd_io_nr_req
);
1028 seq_printf(m
, "total_read_requests %u\n", data
->dasd_read_reqs
);
1029 seq_printf(m
, "total_read_sectors %u\n", data
->dasd_read_sects
);
1030 seq_printf(m
, "total_read_pav %u\n", data
->dasd_read_alias
);
1031 seq_printf(m
, "total_read_hpf %u\n", data
->dasd_read_tpm
);
1032 seq_puts(m
, "histogram_read_sectors ");
1033 dasd_stats_array(m
, data
->dasd_read_secs
);
1034 seq_puts(m
, "histogram_read_times ");
1035 dasd_stats_array(m
, data
->dasd_read_times
);
1036 seq_puts(m
, "histogram_read_time_build_to_ssch ");
1037 dasd_stats_array(m
, data
->dasd_read_time1
);
1038 seq_puts(m
, "histogram_read_time_ssch_to_irq ");
1039 dasd_stats_array(m
, data
->dasd_read_time2
);
1040 seq_puts(m
, "histogram_read_time_irq_to_end ");
1041 dasd_stats_array(m
, data
->dasd_read_time3
);
1042 seq_puts(m
, "histogram_read_ccw_queue_length ");
1043 dasd_stats_array(m
, data
->dasd_read_nr_req
);
1046 static int dasd_stats_show(struct seq_file
*m
, void *v
)
1048 struct dasd_profile
*profile
;
1049 struct dasd_profile_info
*data
;
1051 profile
= m
->private;
1052 spin_lock_bh(&profile
->lock
);
1053 data
= profile
->data
;
1055 spin_unlock_bh(&profile
->lock
);
1056 seq_puts(m
, "disabled\n");
1059 dasd_stats_seq_print(m
, data
);
1060 spin_unlock_bh(&profile
->lock
);
1064 static int dasd_stats_open(struct inode
*inode
, struct file
*file
)
1066 struct dasd_profile
*profile
= inode
->i_private
;
1067 return single_open(file
, dasd_stats_show
, profile
);
1070 static const struct file_operations dasd_stats_raw_fops
= {
1071 .owner
= THIS_MODULE
,
1072 .open
= dasd_stats_open
,
1074 .llseek
= seq_lseek
,
1075 .release
= single_release
,
1076 .write
= dasd_stats_write
,
1079 static void dasd_profile_init(struct dasd_profile
*profile
,
1080 struct dentry
*base_dentry
)
1087 profile
->dentry
= NULL
;
1088 profile
->data
= NULL
;
1089 mode
= (S_IRUSR
| S_IWUSR
| S_IFREG
);
1090 pde
= debugfs_create_file("statistics", mode
, base_dentry
,
1091 profile
, &dasd_stats_raw_fops
);
1092 if (pde
&& !IS_ERR(pde
))
1093 profile
->dentry
= pde
;
1097 static void dasd_profile_exit(struct dasd_profile
*profile
)
1099 dasd_profile_off(profile
);
1100 debugfs_remove(profile
->dentry
);
1101 profile
->dentry
= NULL
;
1104 static void dasd_statistics_removeroot(void)
1106 dasd_global_profile_level
= DASD_PROFILE_OFF
;
1107 dasd_profile_exit(&dasd_global_profile
);
1108 debugfs_remove(dasd_debugfs_global_entry
);
1109 debugfs_remove(dasd_debugfs_root_entry
);
1112 static void dasd_statistics_createroot(void)
1116 dasd_debugfs_root_entry
= NULL
;
1117 pde
= debugfs_create_dir("dasd", NULL
);
1118 if (!pde
|| IS_ERR(pde
))
1120 dasd_debugfs_root_entry
= pde
;
1121 pde
= debugfs_create_dir("global", dasd_debugfs_root_entry
);
1122 if (!pde
|| IS_ERR(pde
))
1124 dasd_debugfs_global_entry
= pde
;
1125 dasd_profile_init(&dasd_global_profile
, dasd_debugfs_global_entry
);
1129 DBF_EVENT(DBF_ERR
, "%s",
1130 "Creation of the dasd debugfs interface failed");
1131 dasd_statistics_removeroot();
1136 #define dasd_profile_start(block, cqr, req) do {} while (0)
1137 #define dasd_profile_end(block, cqr, req) do {} while (0)
1139 static void dasd_statistics_createroot(void)
1144 static void dasd_statistics_removeroot(void)
1149 int dasd_stats_generic_show(struct seq_file
*m
, void *v
)
1151 seq_puts(m
, "Statistics are not activated in this kernel\n");
1155 static void dasd_profile_init(struct dasd_profile
*profile
,
1156 struct dentry
*base_dentry
)
1161 static void dasd_profile_exit(struct dasd_profile
*profile
)
1166 int dasd_profile_on(struct dasd_profile
*profile
)
1171 #endif /* CONFIG_DASD_PROFILE */
1173 static int dasd_hosts_show(struct seq_file
*m
, void *v
)
1175 struct dasd_device
*device
;
1176 int rc
= -EOPNOTSUPP
;
1178 device
= m
->private;
1179 dasd_get_device(device
);
1181 if (device
->discipline
->hosts_print
)
1182 rc
= device
->discipline
->hosts_print(device
, m
);
1184 dasd_put_device(device
);
1188 static int dasd_hosts_open(struct inode
*inode
, struct file
*file
)
1190 struct dasd_device
*device
= inode
->i_private
;
1192 return single_open(file
, dasd_hosts_show
, device
);
1195 static const struct file_operations dasd_hosts_fops
= {
1196 .owner
= THIS_MODULE
,
1197 .open
= dasd_hosts_open
,
1199 .llseek
= seq_lseek
,
1200 .release
= single_release
,
1203 static void dasd_hosts_exit(struct dasd_device
*device
)
1205 debugfs_remove(device
->hosts_dentry
);
1206 device
->hosts_dentry
= NULL
;
1209 static void dasd_hosts_init(struct dentry
*base_dentry
,
1210 struct dasd_device
*device
)
1218 mode
= S_IRUSR
| S_IFREG
;
1219 pde
= debugfs_create_file("host_access_list", mode
, base_dentry
,
1220 device
, &dasd_hosts_fops
);
1221 if (pde
&& !IS_ERR(pde
))
1222 device
->hosts_dentry
= pde
;
1226 * Allocate memory for a channel program with 'cplength' channel
1227 * command words and 'datasize' additional space. There are two
1228 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
1229 * memory and 2) dasd_smalloc_request uses the static ccw memory
1230 * that gets allocated for each device.
1232 struct dasd_ccw_req
*dasd_kmalloc_request(int magic
, int cplength
,
1234 struct dasd_device
*device
)
1236 struct dasd_ccw_req
*cqr
;
1239 BUG_ON(datasize
> PAGE_SIZE
||
1240 (cplength
*sizeof(struct ccw1
)) > PAGE_SIZE
);
1242 cqr
= kzalloc(sizeof(struct dasd_ccw_req
), GFP_ATOMIC
);
1244 return ERR_PTR(-ENOMEM
);
1247 cqr
->cpaddr
= kcalloc(cplength
, sizeof(struct ccw1
),
1248 GFP_ATOMIC
| GFP_DMA
);
1249 if (cqr
->cpaddr
== NULL
) {
1251 return ERR_PTR(-ENOMEM
);
1256 cqr
->data
= kzalloc(datasize
, GFP_ATOMIC
| GFP_DMA
);
1257 if (cqr
->data
== NULL
) {
1260 return ERR_PTR(-ENOMEM
);
1264 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
1265 dasd_get_device(device
);
1268 EXPORT_SYMBOL(dasd_kmalloc_request
);
1270 struct dasd_ccw_req
*dasd_smalloc_request(int magic
, int cplength
,
1272 struct dasd_device
*device
)
1274 unsigned long flags
;
1275 struct dasd_ccw_req
*cqr
;
1279 size
= (sizeof(struct dasd_ccw_req
) + 7L) & -8L;
1281 size
+= cplength
* sizeof(struct ccw1
);
1284 spin_lock_irqsave(&device
->mem_lock
, flags
);
1285 cqr
= (struct dasd_ccw_req
*)
1286 dasd_alloc_chunk(&device
->ccw_chunks
, size
);
1287 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
1289 return ERR_PTR(-ENOMEM
);
1290 memset(cqr
, 0, sizeof(struct dasd_ccw_req
));
1291 data
= (char *) cqr
+ ((sizeof(struct dasd_ccw_req
) + 7L) & -8L);
1294 cqr
->cpaddr
= (struct ccw1
*) data
;
1295 data
+= cplength
*sizeof(struct ccw1
);
1296 memset(cqr
->cpaddr
, 0, cplength
*sizeof(struct ccw1
));
1301 memset(cqr
->data
, 0, datasize
);
1304 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
1305 dasd_get_device(device
);
1308 EXPORT_SYMBOL(dasd_smalloc_request
);
1311 * Free memory of a channel program. This function needs to free all the
1312 * idal lists that might have been created by dasd_set_cda and the
1313 * struct dasd_ccw_req itself.
1315 void dasd_kfree_request(struct dasd_ccw_req
*cqr
, struct dasd_device
*device
)
1319 /* Clear any idals used for the request. */
1322 clear_normalized_cda(ccw
);
1323 } while (ccw
++->flags
& (CCW_FLAG_CC
| CCW_FLAG_DC
));
1327 dasd_put_device(device
);
1329 EXPORT_SYMBOL(dasd_kfree_request
);
1331 void dasd_sfree_request(struct dasd_ccw_req
*cqr
, struct dasd_device
*device
)
1333 unsigned long flags
;
1335 spin_lock_irqsave(&device
->mem_lock
, flags
);
1336 dasd_free_chunk(&device
->ccw_chunks
, cqr
);
1337 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
1338 dasd_put_device(device
);
1340 EXPORT_SYMBOL(dasd_sfree_request
);
1343 * Check discipline magic in cqr.
1345 static inline int dasd_check_cqr(struct dasd_ccw_req
*cqr
)
1347 struct dasd_device
*device
;
1351 device
= cqr
->startdev
;
1352 if (strncmp((char *) &cqr
->magic
, device
->discipline
->ebcname
, 4)) {
1353 DBF_DEV_EVENT(DBF_WARNING
, device
,
1354 " dasd_ccw_req 0x%08x magic doesn't match"
1355 " discipline 0x%08x",
1357 *(unsigned int *) device
->discipline
->name
);
1364 * Terminate the current i/o and set the request to clear_pending.
1365 * Timer keeps device runnig.
1366 * ccw_device_clear can fail if the i/o subsystem
1369 int dasd_term_IO(struct dasd_ccw_req
*cqr
)
1371 struct dasd_device
*device
;
1373 char errorstring
[ERRORLENGTH
];
1376 rc
= dasd_check_cqr(cqr
);
1380 device
= (struct dasd_device
*) cqr
->startdev
;
1381 while ((retries
< 5) && (cqr
->status
== DASD_CQR_IN_IO
)) {
1382 rc
= ccw_device_clear(device
->cdev
, (long) cqr
);
1384 case 0: /* termination successful */
1385 cqr
->status
= DASD_CQR_CLEAR_PENDING
;
1386 cqr
->stopclk
= get_tod_clock();
1388 DBF_DEV_EVENT(DBF_DEBUG
, device
,
1389 "terminate cqr %p successful",
1393 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
1394 "device gone, retry");
1397 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
1398 "I/O error, retry");
1402 * device not valid so no I/O could be running
1403 * handle CQR as termination successful
1405 cqr
->status
= DASD_CQR_CLEARED
;
1406 cqr
->stopclk
= get_tod_clock();
1408 /* no retries for invalid devices */
1410 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
1411 "EINVAL, handle as terminated");
1412 /* fake rc to success */
1416 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
1417 "device busy, retry later");
1420 /* internal error 10 - unknown rc*/
1421 snprintf(errorstring
, ERRORLENGTH
, "10 %d", rc
);
1422 dev_err(&device
->cdev
->dev
, "An error occurred in the "
1423 "DASD device driver, reason=%s\n", errorstring
);
1429 dasd_schedule_device_bh(device
);
1432 EXPORT_SYMBOL(dasd_term_IO
);
1435 * Start the i/o. This start_IO can fail if the channel is really busy.
1436 * In that case set up a timer to start the request later.
1438 int dasd_start_IO(struct dasd_ccw_req
*cqr
)
1440 struct dasd_device
*device
;
1442 char errorstring
[ERRORLENGTH
];
1445 rc
= dasd_check_cqr(cqr
);
1450 device
= (struct dasd_device
*) cqr
->startdev
;
1452 test_bit(DASD_FLAG_LOCK_STOLEN
, &cqr
->block
->base
->flags
)) ||
1453 test_bit(DASD_FLAG_LOCK_STOLEN
, &device
->flags
)) &&
1454 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
1455 DBF_DEV_EVENT(DBF_DEBUG
, device
, "start_IO: return request %p "
1456 "because of stolen lock", cqr
);
1457 cqr
->status
= DASD_CQR_ERROR
;
1458 cqr
->intrc
= -EPERM
;
1461 if (cqr
->retries
< 0) {
1462 /* internal error 14 - start_IO run out of retries */
1463 sprintf(errorstring
, "14 %p", cqr
);
1464 dev_err(&device
->cdev
->dev
, "An error occurred in the DASD "
1465 "device driver, reason=%s\n", errorstring
);
1466 cqr
->status
= DASD_CQR_ERROR
;
1469 cqr
->startclk
= get_tod_clock();
1470 cqr
->starttime
= jiffies
;
1472 if (!test_bit(DASD_CQR_VERIFY_PATH
, &cqr
->flags
)) {
1473 cqr
->lpm
&= dasd_path_get_opm(device
);
1475 cqr
->lpm
= dasd_path_get_opm(device
);
1477 if (cqr
->cpmode
== 1) {
1478 rc
= ccw_device_tm_start(device
->cdev
, cqr
->cpaddr
,
1479 (long) cqr
, cqr
->lpm
);
1481 rc
= ccw_device_start(device
->cdev
, cqr
->cpaddr
,
1482 (long) cqr
, cqr
->lpm
, 0);
1486 cqr
->status
= DASD_CQR_IN_IO
;
1489 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1490 "start_IO: device busy, retry later");
1493 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1494 "start_IO: request timeout, retry later");
1497 /* -EACCES indicates that the request used only a subset of the
1498 * available paths and all these paths are gone. If the lpm of
1499 * this request was only a subset of the opm (e.g. the ppm) then
1500 * we just do a retry with all available paths.
1501 * If we already use the full opm, something is amiss, and we
1502 * need a full path verification.
1504 if (test_bit(DASD_CQR_VERIFY_PATH
, &cqr
->flags
)) {
1505 DBF_DEV_EVENT(DBF_WARNING
, device
,
1506 "start_IO: selected paths gone (%x)",
1508 } else if (cqr
->lpm
!= dasd_path_get_opm(device
)) {
1509 cqr
->lpm
= dasd_path_get_opm(device
);
1510 DBF_DEV_EVENT(DBF_DEBUG
, device
, "%s",
1511 "start_IO: selected paths gone,"
1512 " retry on all paths");
1514 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1515 "start_IO: all paths in opm gone,"
1516 " do path verification");
1517 dasd_generic_last_path_gone(device
);
1518 dasd_path_no_path(device
);
1519 dasd_path_set_tbvpm(device
,
1520 ccw_device_get_path_mask(
1525 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1526 "start_IO: -ENODEV device gone, retry");
1529 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1530 "start_IO: -EIO device gone, retry");
1533 /* most likely caused in power management context */
1534 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1535 "start_IO: -EINVAL device currently "
1539 /* internal error 11 - unknown rc */
1540 snprintf(errorstring
, ERRORLENGTH
, "11 %d", rc
);
1541 dev_err(&device
->cdev
->dev
,
1542 "An error occurred in the DASD device driver, "
1543 "reason=%s\n", errorstring
);
1550 EXPORT_SYMBOL(dasd_start_IO
);
1553 * Timeout function for dasd devices. This is used for different purposes
1554 * 1) missing interrupt handler for normal operation
1555 * 2) delayed start of request where start_IO failed with -EBUSY
1556 * 3) timeout for missing state change interrupts
1557 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
1558 * DASD_CQR_QUEUED for 2) and 3).
1560 static void dasd_device_timeout(struct timer_list
*t
)
1562 unsigned long flags
;
1563 struct dasd_device
*device
;
1565 device
= from_timer(device
, t
, timer
);
1566 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1567 /* re-activate request queue */
1568 dasd_device_remove_stop_bits(device
, DASD_STOPPED_PENDING
);
1569 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1570 dasd_schedule_device_bh(device
);
1574 * Setup timeout for a device in jiffies.
1576 void dasd_device_set_timer(struct dasd_device
*device
, int expires
)
1579 del_timer(&device
->timer
);
1581 mod_timer(&device
->timer
, jiffies
+ expires
);
1583 EXPORT_SYMBOL(dasd_device_set_timer
);
1586 * Clear timeout for a device.
1588 void dasd_device_clear_timer(struct dasd_device
*device
)
1590 del_timer(&device
->timer
);
1592 EXPORT_SYMBOL(dasd_device_clear_timer
);
1594 static void dasd_handle_killed_request(struct ccw_device
*cdev
,
1595 unsigned long intparm
)
1597 struct dasd_ccw_req
*cqr
;
1598 struct dasd_device
*device
;
1602 cqr
= (struct dasd_ccw_req
*) intparm
;
1603 if (cqr
->status
!= DASD_CQR_IN_IO
) {
1604 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
,
1605 "invalid status in handle_killed_request: "
1606 "%02x", cqr
->status
);
1610 device
= dasd_device_from_cdev_locked(cdev
);
1611 if (IS_ERR(device
)) {
1612 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
, "%s",
1613 "unable to get device from cdev");
1617 if (!cqr
->startdev
||
1618 device
!= cqr
->startdev
||
1619 strncmp(cqr
->startdev
->discipline
->ebcname
,
1620 (char *) &cqr
->magic
, 4)) {
1621 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
, "%s",
1622 "invalid device in request");
1623 dasd_put_device(device
);
1627 /* Schedule request to be retried. */
1628 cqr
->status
= DASD_CQR_QUEUED
;
1630 dasd_device_clear_timer(device
);
1631 dasd_schedule_device_bh(device
);
1632 dasd_put_device(device
);
1635 void dasd_generic_handle_state_change(struct dasd_device
*device
)
1637 /* First of all start sense subsystem status request. */
1638 dasd_eer_snss(device
);
1640 dasd_device_remove_stop_bits(device
, DASD_STOPPED_PENDING
);
1641 dasd_schedule_device_bh(device
);
1642 if (device
->block
) {
1643 dasd_schedule_block_bh(device
->block
);
1644 if (device
->block
->request_queue
)
1645 blk_mq_run_hw_queues(device
->block
->request_queue
,
1649 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change
);
1651 static int dasd_check_hpf_error(struct irb
*irb
)
1653 return (scsw_tm_is_valid_schxs(&irb
->scsw
) &&
1654 (irb
->scsw
.tm
.sesq
== SCSW_SESQ_DEV_NOFCX
||
1655 irb
->scsw
.tm
.sesq
== SCSW_SESQ_PATH_NOFCX
));
1659 * Interrupt handler for "normal" ssch-io based dasd devices.
1661 void dasd_int_handler(struct ccw_device
*cdev
, unsigned long intparm
,
1664 struct dasd_ccw_req
*cqr
, *next
;
1665 struct dasd_device
*device
;
1667 int nrf_suppressed
= 0;
1668 int fp_suppressed
= 0;
1672 cqr
= (struct dasd_ccw_req
*) intparm
;
1674 switch (PTR_ERR(irb
)) {
1676 if (cqr
&& cqr
->status
== DASD_CQR_CLEAR_PENDING
) {
1677 device
= cqr
->startdev
;
1678 cqr
->status
= DASD_CQR_CLEARED
;
1679 dasd_device_clear_timer(device
);
1680 wake_up(&dasd_flush_wq
);
1681 dasd_schedule_device_bh(device
);
1686 DBF_EVENT_DEVID(DBF_WARNING
, cdev
, "%s: "
1687 "request timed out\n", __func__
);
1690 DBF_EVENT_DEVID(DBF_WARNING
, cdev
, "%s: "
1691 "unknown error %ld\n", __func__
,
1694 dasd_handle_killed_request(cdev
, intparm
);
1698 now
= get_tod_clock();
1699 /* check for conditions that should be handled immediately */
1701 !(scsw_dstat(&irb
->scsw
) == (DEV_STAT_CHN_END
| DEV_STAT_DEV_END
) &&
1702 scsw_cstat(&irb
->scsw
) == 0)) {
1704 memcpy(&cqr
->irb
, irb
, sizeof(*irb
));
1705 device
= dasd_device_from_cdev_locked(cdev
);
1708 /* ignore unsolicited interrupts for DIAG discipline */
1709 if (device
->discipline
== dasd_diag_discipline_pointer
) {
1710 dasd_put_device(device
);
1715 * In some cases 'File Protected' or 'No Record Found' errors
1716 * might be expected and debug log messages for the
1717 * corresponding interrupts shouldn't be written then.
1718 * Check if either of the according suppress bits is set.
1720 sense
= dasd_get_sense(irb
);
1722 fp_suppressed
= (sense
[1] & SNS1_FILE_PROTECTED
) &&
1723 test_bit(DASD_CQR_SUPPRESS_FP
, &cqr
->flags
);
1724 nrf_suppressed
= (sense
[1] & SNS1_NO_REC_FOUND
) &&
1725 test_bit(DASD_CQR_SUPPRESS_NRF
, &cqr
->flags
);
1727 if (!(fp_suppressed
|| nrf_suppressed
))
1728 device
->discipline
->dump_sense_dbf(device
, irb
, "int");
1730 if (device
->features
& DASD_FEATURE_ERPLOG
)
1731 device
->discipline
->dump_sense(device
, cqr
, irb
);
1732 device
->discipline
->check_for_device_change(device
, cqr
, irb
);
1733 dasd_put_device(device
);
1736 /* check for for attention message */
1737 if (scsw_dstat(&irb
->scsw
) & DEV_STAT_ATTENTION
) {
1738 device
= dasd_device_from_cdev_locked(cdev
);
1739 if (!IS_ERR(device
)) {
1740 device
->discipline
->check_attention(device
,
1741 irb
->esw
.esw1
.lpum
);
1742 dasd_put_device(device
);
1749 device
= (struct dasd_device
*) cqr
->startdev
;
1751 strncmp(device
->discipline
->ebcname
, (char *) &cqr
->magic
, 4)) {
1752 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
, "%s",
1753 "invalid device in request");
1757 /* Check for clear pending */
1758 if (cqr
->status
== DASD_CQR_CLEAR_PENDING
&&
1759 scsw_fctl(&irb
->scsw
) & SCSW_FCTL_CLEAR_FUNC
) {
1760 cqr
->status
= DASD_CQR_CLEARED
;
1761 dasd_device_clear_timer(device
);
1762 wake_up(&dasd_flush_wq
);
1763 dasd_schedule_device_bh(device
);
1767 /* check status - the request might have been killed by dyn detach */
1768 if (cqr
->status
!= DASD_CQR_IN_IO
) {
1769 DBF_DEV_EVENT(DBF_DEBUG
, device
, "invalid status: bus_id %s, "
1770 "status %02x", dev_name(&cdev
->dev
), cqr
->status
);
1776 if (scsw_dstat(&irb
->scsw
) == (DEV_STAT_CHN_END
| DEV_STAT_DEV_END
) &&
1777 scsw_cstat(&irb
->scsw
) == 0) {
1778 /* request was completed successfully */
1779 cqr
->status
= DASD_CQR_SUCCESS
;
1781 /* Start first request on queue if possible -> fast_io. */
1782 if (cqr
->devlist
.next
!= &device
->ccw_queue
) {
1783 next
= list_entry(cqr
->devlist
.next
,
1784 struct dasd_ccw_req
, devlist
);
1786 } else { /* error */
1787 /* check for HPF error
1788 * call discipline function to requeue all requests
1789 * and disable HPF accordingly
1791 if (cqr
->cpmode
&& dasd_check_hpf_error(irb
) &&
1792 device
->discipline
->handle_hpf_error
)
1793 device
->discipline
->handle_hpf_error(device
, irb
);
1795 * If we don't want complex ERP for this request, then just
1796 * reset this and retry it in the fastpath
1798 if (!test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
) &&
1800 if (cqr
->lpm
== dasd_path_get_opm(device
))
1801 DBF_DEV_EVENT(DBF_DEBUG
, device
,
1802 "default ERP in fastpath "
1803 "(%i retries left)",
1805 if (!test_bit(DASD_CQR_VERIFY_PATH
, &cqr
->flags
))
1806 cqr
->lpm
= dasd_path_get_opm(device
);
1807 cqr
->status
= DASD_CQR_QUEUED
;
1810 cqr
->status
= DASD_CQR_ERROR
;
1812 if (next
&& (next
->status
== DASD_CQR_QUEUED
) &&
1813 (!device
->stopped
)) {
1814 if (device
->discipline
->start_IO(next
) == 0)
1815 expires
= next
->expires
;
1818 dasd_device_set_timer(device
, expires
);
1820 dasd_device_clear_timer(device
);
1821 dasd_schedule_device_bh(device
);
1823 EXPORT_SYMBOL(dasd_int_handler
);
1825 enum uc_todo
dasd_generic_uc_handler(struct ccw_device
*cdev
, struct irb
*irb
)
1827 struct dasd_device
*device
;
1829 device
= dasd_device_from_cdev_locked(cdev
);
1833 if (test_bit(DASD_FLAG_OFFLINE
, &device
->flags
) ||
1834 device
->state
!= device
->target
||
1835 !device
->discipline
->check_for_device_change
){
1836 dasd_put_device(device
);
1839 if (device
->discipline
->dump_sense_dbf
)
1840 device
->discipline
->dump_sense_dbf(device
, irb
, "uc");
1841 device
->discipline
->check_for_device_change(device
, NULL
, irb
);
1842 dasd_put_device(device
);
1844 return UC_TODO_RETRY
;
1846 EXPORT_SYMBOL_GPL(dasd_generic_uc_handler
);
1849 * If we have an error on a dasd_block layer request then we cancel
1850 * and return all further requests from the same dasd_block as well.
1852 static void __dasd_device_recovery(struct dasd_device
*device
,
1853 struct dasd_ccw_req
*ref_cqr
)
1855 struct list_head
*l
, *n
;
1856 struct dasd_ccw_req
*cqr
;
1859 * only requeue request that came from the dasd_block layer
1861 if (!ref_cqr
->block
)
1864 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1865 cqr
= list_entry(l
, struct dasd_ccw_req
, devlist
);
1866 if (cqr
->status
== DASD_CQR_QUEUED
&&
1867 ref_cqr
->block
== cqr
->block
) {
1868 cqr
->status
= DASD_CQR_CLEARED
;
1874 * Remove those ccw requests from the queue that need to be returned
1875 * to the upper layer.
1877 static void __dasd_device_process_ccw_queue(struct dasd_device
*device
,
1878 struct list_head
*final_queue
)
1880 struct list_head
*l
, *n
;
1881 struct dasd_ccw_req
*cqr
;
1883 /* Process request with final status. */
1884 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1885 cqr
= list_entry(l
, struct dasd_ccw_req
, devlist
);
1887 /* Skip any non-final request. */
1888 if (cqr
->status
== DASD_CQR_QUEUED
||
1889 cqr
->status
== DASD_CQR_IN_IO
||
1890 cqr
->status
== DASD_CQR_CLEAR_PENDING
)
1892 if (cqr
->status
== DASD_CQR_ERROR
) {
1893 __dasd_device_recovery(device
, cqr
);
1895 /* Rechain finished requests to final queue */
1896 list_move_tail(&cqr
->devlist
, final_queue
);
1901 * the cqrs from the final queue are returned to the upper layer
1902 * by setting a dasd_block state and calling the callback function
1904 static void __dasd_device_process_final_queue(struct dasd_device
*device
,
1905 struct list_head
*final_queue
)
1907 struct list_head
*l
, *n
;
1908 struct dasd_ccw_req
*cqr
;
1909 struct dasd_block
*block
;
1910 void (*callback
)(struct dasd_ccw_req
*, void *data
);
1911 void *callback_data
;
1912 char errorstring
[ERRORLENGTH
];
1914 list_for_each_safe(l
, n
, final_queue
) {
1915 cqr
= list_entry(l
, struct dasd_ccw_req
, devlist
);
1916 list_del_init(&cqr
->devlist
);
1918 callback
= cqr
->callback
;
1919 callback_data
= cqr
->callback_data
;
1921 spin_lock_bh(&block
->queue_lock
);
1922 switch (cqr
->status
) {
1923 case DASD_CQR_SUCCESS
:
1924 cqr
->status
= DASD_CQR_DONE
;
1926 case DASD_CQR_ERROR
:
1927 cqr
->status
= DASD_CQR_NEED_ERP
;
1929 case DASD_CQR_CLEARED
:
1930 cqr
->status
= DASD_CQR_TERMINATED
;
1933 /* internal error 12 - wrong cqr status*/
1934 snprintf(errorstring
, ERRORLENGTH
, "12 %p %x02", cqr
, cqr
->status
);
1935 dev_err(&device
->cdev
->dev
,
1936 "An error occurred in the DASD device driver, "
1937 "reason=%s\n", errorstring
);
1940 if (cqr
->callback
!= NULL
)
1941 (callback
)(cqr
, callback_data
);
1943 spin_unlock_bh(&block
->queue_lock
);
1948 * Take a look at the first request on the ccw queue and check
1949 * if it reached its expire time. If so, terminate the IO.
1951 static void __dasd_device_check_expire(struct dasd_device
*device
)
1953 struct dasd_ccw_req
*cqr
;
1955 if (list_empty(&device
->ccw_queue
))
1957 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, devlist
);
1958 if ((cqr
->status
== DASD_CQR_IN_IO
&& cqr
->expires
!= 0) &&
1959 (time_after_eq(jiffies
, cqr
->expires
+ cqr
->starttime
))) {
1960 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
1962 * IO in safe offline processing should not
1963 * run out of retries
1967 if (device
->discipline
->term_IO(cqr
) != 0) {
1968 /* Hmpf, try again in 5 sec */
1969 dev_err(&device
->cdev
->dev
,
1970 "cqr %p timed out (%lus) but cannot be "
1971 "ended, retrying in 5 s\n",
1972 cqr
, (cqr
->expires
/HZ
));
1973 cqr
->expires
+= 5*HZ
;
1974 dasd_device_set_timer(device
, 5*HZ
);
1976 dev_err(&device
->cdev
->dev
,
1977 "cqr %p timed out (%lus), %i retries "
1978 "remaining\n", cqr
, (cqr
->expires
/HZ
),
1985 * return 1 when device is not eligible for IO
1987 static int __dasd_device_is_unusable(struct dasd_device
*device
,
1988 struct dasd_ccw_req
*cqr
)
1990 int mask
= ~(DASD_STOPPED_DC_WAIT
| DASD_UNRESUMED_PM
);
1992 if (test_bit(DASD_FLAG_OFFLINE
, &device
->flags
) &&
1993 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
1995 * dasd is being set offline
1996 * but it is no safe offline where we have to allow I/O
2000 if (device
->stopped
) {
2001 if (device
->stopped
& mask
) {
2002 /* stopped and CQR will not change that. */
2005 if (!test_bit(DASD_CQR_VERIFY_PATH
, &cqr
->flags
)) {
2006 /* CQR is not able to change device to
2010 /* CQR required to get device operational. */
2016 * Take a look at the first request on the ccw queue and check
2017 * if it needs to be started.
2019 static void __dasd_device_start_head(struct dasd_device
*device
)
2021 struct dasd_ccw_req
*cqr
;
2024 if (list_empty(&device
->ccw_queue
))
2026 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, devlist
);
2027 if (cqr
->status
!= DASD_CQR_QUEUED
)
2029 /* if device is not usable return request to upper layer */
2030 if (__dasd_device_is_unusable(device
, cqr
)) {
2031 cqr
->intrc
= -EAGAIN
;
2032 cqr
->status
= DASD_CQR_CLEARED
;
2033 dasd_schedule_device_bh(device
);
2037 rc
= device
->discipline
->start_IO(cqr
);
2039 dasd_device_set_timer(device
, cqr
->expires
);
2040 else if (rc
== -EACCES
) {
2041 dasd_schedule_device_bh(device
);
2043 /* Hmpf, try again in 1/2 sec */
2044 dasd_device_set_timer(device
, 50);
2047 static void __dasd_device_check_path_events(struct dasd_device
*device
)
2051 if (!dasd_path_get_tbvpm(device
))
2054 if (device
->stopped
&
2055 ~(DASD_STOPPED_DC_WAIT
| DASD_UNRESUMED_PM
))
2057 rc
= device
->discipline
->verify_path(device
,
2058 dasd_path_get_tbvpm(device
));
2060 dasd_device_set_timer(device
, 50);
2062 dasd_path_clear_all_verify(device
);
2066 * Go through all request on the dasd_device request queue,
2067 * terminate them on the cdev if necessary, and return them to the
2068 * submitting layer via callback.
2070 * Make sure that all 'submitting layers' still exist when
2071 * this function is called!. In other words, when 'device' is a base
2072 * device then all block layer requests must have been removed before
2073 * via dasd_flush_block_queue.
2075 int dasd_flush_device_queue(struct dasd_device
*device
)
2077 struct dasd_ccw_req
*cqr
, *n
;
2079 struct list_head flush_queue
;
2081 INIT_LIST_HEAD(&flush_queue
);
2082 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
2084 list_for_each_entry_safe(cqr
, n
, &device
->ccw_queue
, devlist
) {
2085 /* Check status and move request to flush_queue */
2086 switch (cqr
->status
) {
2087 case DASD_CQR_IN_IO
:
2088 rc
= device
->discipline
->term_IO(cqr
);
2090 /* unable to terminate requeust */
2091 dev_err(&device
->cdev
->dev
,
2092 "Flushing the DASD request queue "
2093 "failed for request %p\n", cqr
);
2094 /* stop flush processing */
2098 case DASD_CQR_QUEUED
:
2099 cqr
->stopclk
= get_tod_clock();
2100 cqr
->status
= DASD_CQR_CLEARED
;
2102 default: /* no need to modify the others */
2105 list_move_tail(&cqr
->devlist
, &flush_queue
);
2108 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2110 * After this point all requests must be in state CLEAR_PENDING,
2111 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
2112 * one of the others.
2114 list_for_each_entry_safe(cqr
, n
, &flush_queue
, devlist
)
2115 wait_event(dasd_flush_wq
,
2116 (cqr
->status
!= DASD_CQR_CLEAR_PENDING
));
2118 * Now set each request back to TERMINATED, DONE or NEED_ERP
2119 * and call the callback function of flushed requests
2121 __dasd_device_process_final_queue(device
, &flush_queue
);
2124 EXPORT_SYMBOL_GPL(dasd_flush_device_queue
);
2127 * Acquire the device lock and process queues for the device.
2129 static void dasd_device_tasklet(struct dasd_device
*device
)
2131 struct list_head final_queue
;
2133 atomic_set (&device
->tasklet_scheduled
, 0);
2134 INIT_LIST_HEAD(&final_queue
);
2135 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
2136 /* Check expire time of first request on the ccw queue. */
2137 __dasd_device_check_expire(device
);
2138 /* find final requests on ccw queue */
2139 __dasd_device_process_ccw_queue(device
, &final_queue
);
2140 __dasd_device_check_path_events(device
);
2141 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2142 /* Now call the callback function of requests with final status */
2143 __dasd_device_process_final_queue(device
, &final_queue
);
2144 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
2145 /* Now check if the head of the ccw queue needs to be started. */
2146 __dasd_device_start_head(device
);
2147 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2148 if (waitqueue_active(&shutdown_waitq
))
2149 wake_up(&shutdown_waitq
);
2150 dasd_put_device(device
);
2154 * Schedules a call to dasd_tasklet over the device tasklet.
2156 void dasd_schedule_device_bh(struct dasd_device
*device
)
2158 /* Protect against rescheduling. */
2159 if (atomic_cmpxchg (&device
->tasklet_scheduled
, 0, 1) != 0)
2161 dasd_get_device(device
);
2162 tasklet_hi_schedule(&device
->tasklet
);
2164 EXPORT_SYMBOL(dasd_schedule_device_bh
);
2166 void dasd_device_set_stop_bits(struct dasd_device
*device
, int bits
)
2168 device
->stopped
|= bits
;
2170 EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits
);
2172 void dasd_device_remove_stop_bits(struct dasd_device
*device
, int bits
)
2174 device
->stopped
&= ~bits
;
2175 if (!device
->stopped
)
2176 wake_up(&generic_waitq
);
2178 EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits
);
2181 * Queue a request to the head of the device ccw_queue.
2182 * Start the I/O if possible.
2184 void dasd_add_request_head(struct dasd_ccw_req
*cqr
)
2186 struct dasd_device
*device
;
2187 unsigned long flags
;
2189 device
= cqr
->startdev
;
2190 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
2191 cqr
->status
= DASD_CQR_QUEUED
;
2192 list_add(&cqr
->devlist
, &device
->ccw_queue
);
2193 /* let the bh start the request to keep them in order */
2194 dasd_schedule_device_bh(device
);
2195 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
2197 EXPORT_SYMBOL(dasd_add_request_head
);
2200 * Queue a request to the tail of the device ccw_queue.
2201 * Start the I/O if possible.
2203 void dasd_add_request_tail(struct dasd_ccw_req
*cqr
)
2205 struct dasd_device
*device
;
2206 unsigned long flags
;
2208 device
= cqr
->startdev
;
2209 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
2210 cqr
->status
= DASD_CQR_QUEUED
;
2211 list_add_tail(&cqr
->devlist
, &device
->ccw_queue
);
2212 /* let the bh start the request to keep them in order */
2213 dasd_schedule_device_bh(device
);
2214 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
2216 EXPORT_SYMBOL(dasd_add_request_tail
);
2219 * Wakeup helper for the 'sleep_on' functions.
2221 void dasd_wakeup_cb(struct dasd_ccw_req
*cqr
, void *data
)
2223 spin_lock_irq(get_ccwdev_lock(cqr
->startdev
->cdev
));
2224 cqr
->callback_data
= DASD_SLEEPON_END_TAG
;
2225 spin_unlock_irq(get_ccwdev_lock(cqr
->startdev
->cdev
));
2226 wake_up(&generic_waitq
);
2228 EXPORT_SYMBOL_GPL(dasd_wakeup_cb
);
2230 static inline int _wait_for_wakeup(struct dasd_ccw_req
*cqr
)
2232 struct dasd_device
*device
;
2235 device
= cqr
->startdev
;
2236 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
2237 rc
= (cqr
->callback_data
== DASD_SLEEPON_END_TAG
);
2238 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2243 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
2245 static int __dasd_sleep_on_erp(struct dasd_ccw_req
*cqr
)
2247 struct dasd_device
*device
;
2248 dasd_erp_fn_t erp_fn
;
2250 if (cqr
->status
== DASD_CQR_FILLED
)
2252 device
= cqr
->startdev
;
2253 if (test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
)) {
2254 if (cqr
->status
== DASD_CQR_TERMINATED
) {
2255 device
->discipline
->handle_terminated_request(cqr
);
2258 if (cqr
->status
== DASD_CQR_NEED_ERP
) {
2259 erp_fn
= device
->discipline
->erp_action(cqr
);
2263 if (cqr
->status
== DASD_CQR_FAILED
)
2264 dasd_log_sense(cqr
, &cqr
->irb
);
2266 __dasd_process_erp(device
, cqr
);
2273 static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req
*cqr
)
2275 if (test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
)) {
2276 if (cqr
->refers
) /* erp is not done yet */
2278 return ((cqr
->status
!= DASD_CQR_DONE
) &&
2279 (cqr
->status
!= DASD_CQR_FAILED
));
2281 return (cqr
->status
== DASD_CQR_FILLED
);
2284 static int _dasd_sleep_on(struct dasd_ccw_req
*maincqr
, int interruptible
)
2286 struct dasd_device
*device
;
2288 struct list_head ccw_queue
;
2289 struct dasd_ccw_req
*cqr
;
2291 INIT_LIST_HEAD(&ccw_queue
);
2292 maincqr
->status
= DASD_CQR_FILLED
;
2293 device
= maincqr
->startdev
;
2294 list_add(&maincqr
->blocklist
, &ccw_queue
);
2295 for (cqr
= maincqr
; __dasd_sleep_on_loop_condition(cqr
);
2296 cqr
= list_first_entry(&ccw_queue
,
2297 struct dasd_ccw_req
, blocklist
)) {
2299 if (__dasd_sleep_on_erp(cqr
))
2301 if (cqr
->status
!= DASD_CQR_FILLED
) /* could be failed */
2303 if (test_bit(DASD_FLAG_LOCK_STOLEN
, &device
->flags
) &&
2304 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
2305 cqr
->status
= DASD_CQR_FAILED
;
2306 cqr
->intrc
= -EPERM
;
2309 /* Non-temporary stop condition will trigger fail fast */
2310 if (device
->stopped
& ~DASD_STOPPED_PENDING
&&
2311 test_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
) &&
2312 (!dasd_eer_enabled(device
))) {
2313 cqr
->status
= DASD_CQR_FAILED
;
2314 cqr
->intrc
= -ENOLINK
;
2318 * Don't try to start requests if device is in
2319 * offline processing, it might wait forever
2321 if (test_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
2322 cqr
->status
= DASD_CQR_FAILED
;
2323 cqr
->intrc
= -ENODEV
;
2327 * Don't try to start requests if device is stopped
2328 * except path verification requests
2330 if (!test_bit(DASD_CQR_VERIFY_PATH
, &cqr
->flags
)) {
2331 if (interruptible
) {
2332 rc
= wait_event_interruptible(
2333 generic_waitq
, !(device
->stopped
));
2334 if (rc
== -ERESTARTSYS
) {
2335 cqr
->status
= DASD_CQR_FAILED
;
2336 maincqr
->intrc
= rc
;
2340 wait_event(generic_waitq
, !(device
->stopped
));
2343 cqr
->callback
= dasd_wakeup_cb
;
2345 cqr
->callback_data
= DASD_SLEEPON_START_TAG
;
2346 dasd_add_request_tail(cqr
);
2347 if (interruptible
) {
2348 rc
= wait_event_interruptible(
2349 generic_waitq
, _wait_for_wakeup(cqr
));
2350 if (rc
== -ERESTARTSYS
) {
2351 dasd_cancel_req(cqr
);
2352 /* wait (non-interruptible) for final status */
2353 wait_event(generic_waitq
,
2354 _wait_for_wakeup(cqr
));
2355 cqr
->status
= DASD_CQR_FAILED
;
2356 maincqr
->intrc
= rc
;
2360 wait_event(generic_waitq
, _wait_for_wakeup(cqr
));
2363 maincqr
->endclk
= get_tod_clock();
2364 if ((maincqr
->status
!= DASD_CQR_DONE
) &&
2365 (maincqr
->intrc
!= -ERESTARTSYS
))
2366 dasd_log_sense(maincqr
, &maincqr
->irb
);
2367 if (maincqr
->status
== DASD_CQR_DONE
)
2369 else if (maincqr
->intrc
)
2370 rc
= maincqr
->intrc
;
2376 static inline int _wait_for_wakeup_queue(struct list_head
*ccw_queue
)
2378 struct dasd_ccw_req
*cqr
;
2380 list_for_each_entry(cqr
, ccw_queue
, blocklist
) {
2381 if (cqr
->callback_data
!= DASD_SLEEPON_END_TAG
)
2388 static int _dasd_sleep_on_queue(struct list_head
*ccw_queue
, int interruptible
)
2390 struct dasd_device
*device
;
2391 struct dasd_ccw_req
*cqr
, *n
;
2396 list_for_each_entry_safe(cqr
, n
, ccw_queue
, blocklist
) {
2397 device
= cqr
->startdev
;
2398 if (cqr
->status
!= DASD_CQR_FILLED
) /*could be failed*/
2401 if (test_bit(DASD_FLAG_LOCK_STOLEN
, &device
->flags
) &&
2402 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
2403 cqr
->status
= DASD_CQR_FAILED
;
2404 cqr
->intrc
= -EPERM
;
2407 /*Non-temporary stop condition will trigger fail fast*/
2408 if (device
->stopped
& ~DASD_STOPPED_PENDING
&&
2409 test_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
) &&
2410 !dasd_eer_enabled(device
)) {
2411 cqr
->status
= DASD_CQR_FAILED
;
2412 cqr
->intrc
= -EAGAIN
;
2416 /*Don't try to start requests if device is stopped*/
2417 if (interruptible
) {
2418 rc
= wait_event_interruptible(
2419 generic_waitq
, !device
->stopped
);
2420 if (rc
== -ERESTARTSYS
) {
2421 cqr
->status
= DASD_CQR_FAILED
;
2426 wait_event(generic_waitq
, !(device
->stopped
));
2429 cqr
->callback
= dasd_wakeup_cb
;
2430 cqr
->callback_data
= DASD_SLEEPON_START_TAG
;
2431 dasd_add_request_tail(cqr
);
2434 wait_event(generic_waitq
, _wait_for_wakeup_queue(ccw_queue
));
2437 list_for_each_entry_safe(cqr
, n
, ccw_queue
, blocklist
) {
2439 * In some cases the 'File Protected' or 'Incorrect Length'
2440 * error might be expected and error recovery would be
2441 * unnecessary in these cases. Check if the according suppress
2444 sense
= dasd_get_sense(&cqr
->irb
);
2445 if (sense
&& sense
[1] & SNS1_FILE_PROTECTED
&&
2446 test_bit(DASD_CQR_SUPPRESS_FP
, &cqr
->flags
))
2448 if (scsw_cstat(&cqr
->irb
.scsw
) == 0x40 &&
2449 test_bit(DASD_CQR_SUPPRESS_IL
, &cqr
->flags
))
2453 * for alias devices simplify error recovery and
2454 * return to upper layer
2455 * do not skip ERP requests
2457 if (cqr
->startdev
!= cqr
->basedev
&& !cqr
->refers
&&
2458 (cqr
->status
== DASD_CQR_TERMINATED
||
2459 cqr
->status
== DASD_CQR_NEED_ERP
))
2462 /* normal recovery for basedev IO */
2463 if (__dasd_sleep_on_erp(cqr
))
2464 /* handle erp first */
2472 * Queue a request to the tail of the device ccw_queue and wait for
2475 int dasd_sleep_on(struct dasd_ccw_req
*cqr
)
2477 return _dasd_sleep_on(cqr
, 0);
2479 EXPORT_SYMBOL(dasd_sleep_on
);
2482 * Start requests from a ccw_queue and wait for their completion.
2484 int dasd_sleep_on_queue(struct list_head
*ccw_queue
)
2486 return _dasd_sleep_on_queue(ccw_queue
, 0);
2488 EXPORT_SYMBOL(dasd_sleep_on_queue
);
2491 * Queue a request to the tail of the device ccw_queue and wait
2492 * interruptible for it's completion.
2494 int dasd_sleep_on_interruptible(struct dasd_ccw_req
*cqr
)
2496 return _dasd_sleep_on(cqr
, 1);
2498 EXPORT_SYMBOL(dasd_sleep_on_interruptible
);
2501 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
2502 * for eckd devices) the currently running request has to be terminated
2503 * and be put back to status queued, before the special request is added
2504 * to the head of the queue. Then the special request is waited on normally.
2506 static inline int _dasd_term_running_cqr(struct dasd_device
*device
)
2508 struct dasd_ccw_req
*cqr
;
2511 if (list_empty(&device
->ccw_queue
))
2513 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, devlist
);
2514 rc
= device
->discipline
->term_IO(cqr
);
2517 * CQR terminated because a more important request is pending.
2518 * Undo decreasing of retry counter because this is
2519 * not an error case.
2525 int dasd_sleep_on_immediatly(struct dasd_ccw_req
*cqr
)
2527 struct dasd_device
*device
;
2530 device
= cqr
->startdev
;
2531 if (test_bit(DASD_FLAG_LOCK_STOLEN
, &device
->flags
) &&
2532 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
2533 cqr
->status
= DASD_CQR_FAILED
;
2534 cqr
->intrc
= -EPERM
;
2537 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
2538 rc
= _dasd_term_running_cqr(device
);
2540 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2543 cqr
->callback
= dasd_wakeup_cb
;
2544 cqr
->callback_data
= DASD_SLEEPON_START_TAG
;
2545 cqr
->status
= DASD_CQR_QUEUED
;
2547 * add new request as second
2548 * first the terminated cqr needs to be finished
2550 list_add(&cqr
->devlist
, device
->ccw_queue
.next
);
2552 /* let the bh start the request to keep them in order */
2553 dasd_schedule_device_bh(device
);
2555 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2557 wait_event(generic_waitq
, _wait_for_wakeup(cqr
));
2559 if (cqr
->status
== DASD_CQR_DONE
)
2561 else if (cqr
->intrc
)
2567 dasd_schedule_device_bh(device
);
2569 dasd_schedule_block_bh(device
->block
);
2573 EXPORT_SYMBOL(dasd_sleep_on_immediatly
);
2576 * Cancels a request that was started with dasd_sleep_on_req.
2577 * This is useful to timeout requests. The request will be
2578 * terminated if it is currently in i/o.
2579 * Returns 0 if request termination was successful
2580 * negative error code if termination failed
2581 * Cancellation of a request is an asynchronous operation! The calling
2582 * function has to wait until the request is properly returned via callback.
2584 int dasd_cancel_req(struct dasd_ccw_req
*cqr
)
2586 struct dasd_device
*device
= cqr
->startdev
;
2587 unsigned long flags
;
2591 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
2592 switch (cqr
->status
) {
2593 case DASD_CQR_QUEUED
:
2594 /* request was not started - just set to cleared */
2595 cqr
->status
= DASD_CQR_CLEARED
;
2596 if (cqr
->callback_data
== DASD_SLEEPON_START_TAG
)
2597 cqr
->callback_data
= DASD_SLEEPON_END_TAG
;
2599 case DASD_CQR_IN_IO
:
2600 /* request in IO - terminate IO and release again */
2601 rc
= device
->discipline
->term_IO(cqr
);
2603 dev_err(&device
->cdev
->dev
,
2604 "Cancelling request %p failed with rc=%d\n",
2607 cqr
->stopclk
= get_tod_clock();
2610 default: /* already finished or clear pending - do nothing */
2613 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
2614 dasd_schedule_device_bh(device
);
2617 EXPORT_SYMBOL(dasd_cancel_req
);
2620 * SECTION: Operations of the dasd_block layer.
2624 * Timeout function for dasd_block. This is used when the block layer
2625 * is waiting for something that may not come reliably, (e.g. a state
2628 static void dasd_block_timeout(struct timer_list
*t
)
2630 unsigned long flags
;
2631 struct dasd_block
*block
;
2633 block
= from_timer(block
, t
, timer
);
2634 spin_lock_irqsave(get_ccwdev_lock(block
->base
->cdev
), flags
);
2635 /* re-activate request queue */
2636 dasd_device_remove_stop_bits(block
->base
, DASD_STOPPED_PENDING
);
2637 spin_unlock_irqrestore(get_ccwdev_lock(block
->base
->cdev
), flags
);
2638 dasd_schedule_block_bh(block
);
2639 blk_mq_run_hw_queues(block
->request_queue
, true);
2643 * Setup timeout for a dasd_block in jiffies.
2645 void dasd_block_set_timer(struct dasd_block
*block
, int expires
)
2648 del_timer(&block
->timer
);
2650 mod_timer(&block
->timer
, jiffies
+ expires
);
2652 EXPORT_SYMBOL(dasd_block_set_timer
);
2655 * Clear timeout for a dasd_block.
2657 void dasd_block_clear_timer(struct dasd_block
*block
)
2659 del_timer(&block
->timer
);
2661 EXPORT_SYMBOL(dasd_block_clear_timer
);
2664 * Process finished error recovery ccw.
2666 static void __dasd_process_erp(struct dasd_device
*device
,
2667 struct dasd_ccw_req
*cqr
)
2669 dasd_erp_fn_t erp_fn
;
2671 if (cqr
->status
== DASD_CQR_DONE
)
2672 DBF_DEV_EVENT(DBF_NOTICE
, device
, "%s", "ERP successful");
2674 dev_err(&device
->cdev
->dev
, "ERP failed for the DASD\n");
2675 erp_fn
= device
->discipline
->erp_postaction(cqr
);
2679 static void __dasd_cleanup_cqr(struct dasd_ccw_req
*cqr
)
2681 struct request
*req
;
2682 blk_status_t error
= BLK_STS_OK
;
2685 req
= (struct request
*) cqr
->callback_data
;
2686 dasd_profile_end(cqr
->block
, cqr
, req
);
2688 status
= cqr
->block
->base
->discipline
->free_cp(cqr
, req
);
2690 error
= errno_to_blk_status(status
);
2691 else if (status
== 0) {
2692 switch (cqr
->intrc
) {
2694 error
= BLK_STS_NEXUS
;
2697 error
= BLK_STS_TRANSPORT
;
2700 error
= BLK_STS_TIMEOUT
;
2703 error
= BLK_STS_IOERR
;
2709 * We need to take care for ETIMEDOUT errors here since the
2710 * complete callback does not get called in this case.
2711 * Take care of all errors here and avoid additional code to
2712 * transfer the error value to the complete callback.
2715 blk_mq_end_request(req
, error
);
2716 blk_mq_run_hw_queues(req
->q
, true);
2718 blk_mq_complete_request(req
);
2723 * Process ccw request queue.
2725 static void __dasd_process_block_ccw_queue(struct dasd_block
*block
,
2726 struct list_head
*final_queue
)
2728 struct list_head
*l
, *n
;
2729 struct dasd_ccw_req
*cqr
;
2730 dasd_erp_fn_t erp_fn
;
2731 unsigned long flags
;
2732 struct dasd_device
*base
= block
->base
;
2735 /* Process request with final status. */
2736 list_for_each_safe(l
, n
, &block
->ccw_queue
) {
2737 cqr
= list_entry(l
, struct dasd_ccw_req
, blocklist
);
2738 if (cqr
->status
!= DASD_CQR_DONE
&&
2739 cqr
->status
!= DASD_CQR_FAILED
&&
2740 cqr
->status
!= DASD_CQR_NEED_ERP
&&
2741 cqr
->status
!= DASD_CQR_TERMINATED
)
2744 if (cqr
->status
== DASD_CQR_TERMINATED
) {
2745 base
->discipline
->handle_terminated_request(cqr
);
2749 /* Process requests that may be recovered */
2750 if (cqr
->status
== DASD_CQR_NEED_ERP
) {
2751 erp_fn
= base
->discipline
->erp_action(cqr
);
2752 if (IS_ERR(erp_fn(cqr
)))
2757 /* log sense for fatal error */
2758 if (cqr
->status
== DASD_CQR_FAILED
) {
2759 dasd_log_sense(cqr
, &cqr
->irb
);
2762 /* First of all call extended error reporting. */
2763 if (dasd_eer_enabled(base
) &&
2764 cqr
->status
== DASD_CQR_FAILED
) {
2765 dasd_eer_write(base
, cqr
, DASD_EER_FATALERROR
);
2767 /* restart request */
2768 cqr
->status
= DASD_CQR_FILLED
;
2770 spin_lock_irqsave(get_ccwdev_lock(base
->cdev
), flags
);
2771 dasd_device_set_stop_bits(base
, DASD_STOPPED_QUIESCE
);
2772 spin_unlock_irqrestore(get_ccwdev_lock(base
->cdev
),
2777 /* Process finished ERP request. */
2779 __dasd_process_erp(base
, cqr
);
2783 /* Rechain finished requests to final queue */
2784 cqr
->endclk
= get_tod_clock();
2785 list_move_tail(&cqr
->blocklist
, final_queue
);
2789 static void dasd_return_cqr_cb(struct dasd_ccw_req
*cqr
, void *data
)
2791 dasd_schedule_block_bh(cqr
->block
);
2794 static void __dasd_block_start_head(struct dasd_block
*block
)
2796 struct dasd_ccw_req
*cqr
;
2798 if (list_empty(&block
->ccw_queue
))
2800 /* We allways begin with the first requests on the queue, as some
2801 * of previously started requests have to be enqueued on a
2802 * dasd_device again for error recovery.
2804 list_for_each_entry(cqr
, &block
->ccw_queue
, blocklist
) {
2805 if (cqr
->status
!= DASD_CQR_FILLED
)
2807 if (test_bit(DASD_FLAG_LOCK_STOLEN
, &block
->base
->flags
) &&
2808 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
2809 cqr
->status
= DASD_CQR_FAILED
;
2810 cqr
->intrc
= -EPERM
;
2811 dasd_schedule_block_bh(block
);
2814 /* Non-temporary stop condition will trigger fail fast */
2815 if (block
->base
->stopped
& ~DASD_STOPPED_PENDING
&&
2816 test_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
) &&
2817 (!dasd_eer_enabled(block
->base
))) {
2818 cqr
->status
= DASD_CQR_FAILED
;
2819 cqr
->intrc
= -ENOLINK
;
2820 dasd_schedule_block_bh(block
);
2823 /* Don't try to start requests if device is stopped */
2824 if (block
->base
->stopped
)
2827 /* just a fail safe check, should not happen */
2829 cqr
->startdev
= block
->base
;
2831 /* make sure that the requests we submit find their way back */
2832 cqr
->callback
= dasd_return_cqr_cb
;
2834 dasd_add_request_tail(cqr
);
2839 * Central dasd_block layer routine. Takes requests from the generic
2840 * block layer request queue, creates ccw requests, enqueues them on
2841 * a dasd_device and processes ccw requests that have been returned.
2843 static void dasd_block_tasklet(struct dasd_block
*block
)
2845 struct list_head final_queue
;
2846 struct list_head
*l
, *n
;
2847 struct dasd_ccw_req
*cqr
;
2848 struct dasd_queue
*dq
;
2850 atomic_set(&block
->tasklet_scheduled
, 0);
2851 INIT_LIST_HEAD(&final_queue
);
2852 spin_lock_irq(&block
->queue_lock
);
2853 /* Finish off requests on ccw queue */
2854 __dasd_process_block_ccw_queue(block
, &final_queue
);
2855 spin_unlock_irq(&block
->queue_lock
);
2857 /* Now call the callback function of requests with final status */
2858 list_for_each_safe(l
, n
, &final_queue
) {
2859 cqr
= list_entry(l
, struct dasd_ccw_req
, blocklist
);
2861 spin_lock_irq(&dq
->lock
);
2862 list_del_init(&cqr
->blocklist
);
2863 __dasd_cleanup_cqr(cqr
);
2864 spin_unlock_irq(&dq
->lock
);
2867 spin_lock_irq(&block
->queue_lock
);
2868 /* Now check if the head of the ccw queue needs to be started. */
2869 __dasd_block_start_head(block
);
2870 spin_unlock_irq(&block
->queue_lock
);
2872 if (waitqueue_active(&shutdown_waitq
))
2873 wake_up(&shutdown_waitq
);
2874 dasd_put_device(block
->base
);
2877 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req
*cqr
, void *data
)
2879 wake_up(&dasd_flush_wq
);
2883 * Requeue a request back to the block request queue
2884 * only works for block requests
2886 static int _dasd_requeue_request(struct dasd_ccw_req
*cqr
)
2888 struct dasd_block
*block
= cqr
->block
;
2889 struct request
*req
;
2893 spin_lock_irq(&cqr
->dq
->lock
);
2894 req
= (struct request
*) cqr
->callback_data
;
2895 blk_mq_requeue_request(req
, false);
2896 spin_unlock_irq(&cqr
->dq
->lock
);
2902 * Go through all request on the dasd_block request queue, cancel them
2903 * on the respective dasd_device, and return them to the generic
2906 static int dasd_flush_block_queue(struct dasd_block
*block
)
2908 struct dasd_ccw_req
*cqr
, *n
;
2910 struct list_head flush_queue
;
2911 unsigned long flags
;
2913 INIT_LIST_HEAD(&flush_queue
);
2914 spin_lock_bh(&block
->queue_lock
);
2917 list_for_each_entry_safe(cqr
, n
, &block
->ccw_queue
, blocklist
) {
2918 /* if this request currently owned by a dasd_device cancel it */
2919 if (cqr
->status
>= DASD_CQR_QUEUED
)
2920 rc
= dasd_cancel_req(cqr
);
2923 /* Rechain request (including erp chain) so it won't be
2924 * touched by the dasd_block_tasklet anymore.
2925 * Replace the callback so we notice when the request
2926 * is returned from the dasd_device layer.
2928 cqr
->callback
= _dasd_wake_block_flush_cb
;
2929 for (i
= 0; cqr
!= NULL
; cqr
= cqr
->refers
, i
++)
2930 list_move_tail(&cqr
->blocklist
, &flush_queue
);
2932 /* moved more than one request - need to restart */
2935 spin_unlock_bh(&block
->queue_lock
);
2936 /* Now call the callback function of flushed requests */
2938 list_for_each_entry_safe(cqr
, n
, &flush_queue
, blocklist
) {
2939 wait_event(dasd_flush_wq
, (cqr
->status
< DASD_CQR_QUEUED
));
2940 /* Process finished ERP request. */
2942 spin_lock_bh(&block
->queue_lock
);
2943 __dasd_process_erp(block
->base
, cqr
);
2944 spin_unlock_bh(&block
->queue_lock
);
2945 /* restart list_for_xx loop since dasd_process_erp
2946 * might remove multiple elements */
2949 /* call the callback function */
2950 spin_lock_irqsave(&cqr
->dq
->lock
, flags
);
2951 cqr
->endclk
= get_tod_clock();
2952 list_del_init(&cqr
->blocklist
);
2953 __dasd_cleanup_cqr(cqr
);
2954 spin_unlock_irqrestore(&cqr
->dq
->lock
, flags
);
2960 * Schedules a call to dasd_tasklet over the device tasklet.
2962 void dasd_schedule_block_bh(struct dasd_block
*block
)
2964 /* Protect against rescheduling. */
2965 if (atomic_cmpxchg(&block
->tasklet_scheduled
, 0, 1) != 0)
2967 /* life cycle of block is bound to it's base device */
2968 dasd_get_device(block
->base
);
2969 tasklet_hi_schedule(&block
->tasklet
);
2971 EXPORT_SYMBOL(dasd_schedule_block_bh
);
2975 * SECTION: external block device operations
2976 * (request queue handling, open, release, etc.)
2980 * Dasd request queue function. Called from ll_rw_blk.c
2982 static blk_status_t
do_dasd_request(struct blk_mq_hw_ctx
*hctx
,
2983 const struct blk_mq_queue_data
*qd
)
2985 struct dasd_block
*block
= hctx
->queue
->queuedata
;
2986 struct dasd_queue
*dq
= hctx
->driver_data
;
2987 struct request
*req
= qd
->rq
;
2988 struct dasd_device
*basedev
;
2989 struct dasd_ccw_req
*cqr
;
2990 blk_status_t rc
= BLK_STS_OK
;
2992 basedev
= block
->base
;
2993 spin_lock_irq(&dq
->lock
);
2994 if (basedev
->state
< DASD_STATE_READY
) {
2995 DBF_DEV_EVENT(DBF_ERR
, basedev
,
2996 "device not ready for request %p", req
);
3002 * if device is stopped do not fetch new requests
3003 * except failfast is active which will let requests fail
3004 * immediately in __dasd_block_start_head()
3006 if (basedev
->stopped
&& !(basedev
->features
& DASD_FEATURE_FAILFAST
)) {
3007 DBF_DEV_EVENT(DBF_ERR
, basedev
,
3008 "device stopped request %p", req
);
3009 rc
= BLK_STS_RESOURCE
;
3013 if (basedev
->features
& DASD_FEATURE_READONLY
&&
3014 rq_data_dir(req
) == WRITE
) {
3015 DBF_DEV_EVENT(DBF_ERR
, basedev
,
3016 "Rejecting write request %p", req
);
3021 if (test_bit(DASD_FLAG_ABORTALL
, &basedev
->flags
) &&
3022 (basedev
->features
& DASD_FEATURE_FAILFAST
||
3023 blk_noretry_request(req
))) {
3024 DBF_DEV_EVENT(DBF_ERR
, basedev
,
3025 "Rejecting failfast request %p", req
);
3030 cqr
= basedev
->discipline
->build_cp(basedev
, block
, req
);
3032 if (PTR_ERR(cqr
) == -EBUSY
||
3033 PTR_ERR(cqr
) == -ENOMEM
||
3034 PTR_ERR(cqr
) == -EAGAIN
) {
3035 rc
= BLK_STS_RESOURCE
;
3038 DBF_DEV_EVENT(DBF_ERR
, basedev
,
3039 "CCW creation failed (rc=%ld) on request %p",
3045 * Note: callback is set to dasd_return_cqr_cb in
3046 * __dasd_block_start_head to cover erp requests as well
3048 cqr
->callback_data
= req
;
3049 cqr
->status
= DASD_CQR_FILLED
;
3051 req
->completion_data
= cqr
;
3052 blk_mq_start_request(req
);
3053 spin_lock(&block
->queue_lock
);
3054 list_add_tail(&cqr
->blocklist
, &block
->ccw_queue
);
3055 INIT_LIST_HEAD(&cqr
->devlist
);
3056 dasd_profile_start(block
, cqr
, req
);
3057 dasd_schedule_block_bh(block
);
3058 spin_unlock(&block
->queue_lock
);
3061 spin_unlock_irq(&dq
->lock
);
3066 * Block timeout callback, called from the block layer
3069 * BLK_EH_RESET_TIMER if the request should be left running
3070 * BLK_EH_NOT_HANDLED if the request is handled or terminated
3073 enum blk_eh_timer_return
dasd_times_out(struct request
*req
, bool reserved
)
3075 struct dasd_ccw_req
*cqr
= req
->completion_data
;
3076 struct dasd_block
*block
= req
->q
->queuedata
;
3077 struct dasd_device
*device
;
3078 unsigned long flags
;
3082 return BLK_EH_NOT_HANDLED
;
3084 spin_lock_irqsave(&cqr
->dq
->lock
, flags
);
3085 device
= cqr
->startdev
? cqr
->startdev
: block
->base
;
3086 if (!device
->blk_timeout
) {
3087 spin_unlock_irqrestore(&cqr
->dq
->lock
, flags
);
3088 return BLK_EH_RESET_TIMER
;
3090 DBF_DEV_EVENT(DBF_WARNING
, device
,
3091 " dasd_times_out cqr %p status %x",
3094 spin_lock(&block
->queue_lock
);
3095 spin_lock(get_ccwdev_lock(device
->cdev
));
3097 cqr
->intrc
= -ETIMEDOUT
;
3098 if (cqr
->status
>= DASD_CQR_QUEUED
) {
3099 spin_unlock(get_ccwdev_lock(device
->cdev
));
3100 rc
= dasd_cancel_req(cqr
);
3101 } else if (cqr
->status
== DASD_CQR_FILLED
||
3102 cqr
->status
== DASD_CQR_NEED_ERP
) {
3103 cqr
->status
= DASD_CQR_TERMINATED
;
3104 spin_unlock(get_ccwdev_lock(device
->cdev
));
3105 } else if (cqr
->status
== DASD_CQR_IN_ERP
) {
3106 struct dasd_ccw_req
*searchcqr
, *nextcqr
, *tmpcqr
;
3108 list_for_each_entry_safe(searchcqr
, nextcqr
,
3109 &block
->ccw_queue
, blocklist
) {
3111 while (tmpcqr
->refers
)
3112 tmpcqr
= tmpcqr
->refers
;
3115 /* searchcqr is an ERP request for cqr */
3116 searchcqr
->retries
= -1;
3117 searchcqr
->intrc
= -ETIMEDOUT
;
3118 if (searchcqr
->status
>= DASD_CQR_QUEUED
) {
3119 spin_unlock(get_ccwdev_lock(device
->cdev
));
3120 rc
= dasd_cancel_req(searchcqr
);
3121 spin_lock(get_ccwdev_lock(device
->cdev
));
3122 } else if ((searchcqr
->status
== DASD_CQR_FILLED
) ||
3123 (searchcqr
->status
== DASD_CQR_NEED_ERP
)) {
3124 searchcqr
->status
= DASD_CQR_TERMINATED
;
3126 } else if (searchcqr
->status
== DASD_CQR_IN_ERP
) {
3128 * Shouldn't happen; most recent ERP
3129 * request is at the front of queue
3135 spin_unlock(get_ccwdev_lock(device
->cdev
));
3137 dasd_schedule_block_bh(block
);
3138 spin_unlock(&block
->queue_lock
);
3139 spin_unlock_irqrestore(&cqr
->dq
->lock
, flags
);
3141 return rc
? BLK_EH_RESET_TIMER
: BLK_EH_NOT_HANDLED
;
3144 static int dasd_init_hctx(struct blk_mq_hw_ctx
*hctx
, void *data
,
3147 struct dasd_queue
*dq
= kzalloc(sizeof(*dq
), GFP_KERNEL
);
3152 spin_lock_init(&dq
->lock
);
3153 hctx
->driver_data
= dq
;
3158 static void dasd_exit_hctx(struct blk_mq_hw_ctx
*hctx
, unsigned int idx
)
3160 kfree(hctx
->driver_data
);
3161 hctx
->driver_data
= NULL
;
3164 static void dasd_request_done(struct request
*req
)
3166 blk_mq_end_request(req
, 0);
3167 blk_mq_run_hw_queues(req
->q
, true);
3170 static struct blk_mq_ops dasd_mq_ops
= {
3171 .queue_rq
= do_dasd_request
,
3172 .complete
= dasd_request_done
,
3173 .timeout
= dasd_times_out
,
3174 .init_hctx
= dasd_init_hctx
,
3175 .exit_hctx
= dasd_exit_hctx
,
3179 * Allocate and initialize request queue and default I/O scheduler.
3181 static int dasd_alloc_queue(struct dasd_block
*block
)
3185 block
->tag_set
.ops
= &dasd_mq_ops
;
3186 block
->tag_set
.nr_hw_queues
= DASD_NR_HW_QUEUES
;
3187 block
->tag_set
.queue_depth
= DASD_MAX_LCU_DEV
* DASD_REQ_PER_DEV
;
3188 block
->tag_set
.flags
= BLK_MQ_F_SHOULD_MERGE
;
3190 rc
= blk_mq_alloc_tag_set(&block
->tag_set
);
3194 block
->request_queue
= blk_mq_init_queue(&block
->tag_set
);
3195 if (IS_ERR(block
->request_queue
))
3196 return PTR_ERR(block
->request_queue
);
3198 block
->request_queue
->queuedata
= block
;
3204 * Allocate and initialize request queue.
3206 static void dasd_setup_queue(struct dasd_block
*block
)
3208 unsigned int logical_block_size
= block
->bp_block
;
3209 struct request_queue
*q
= block
->request_queue
;
3210 unsigned int max_bytes
, max_discard_sectors
;
3213 if (block
->base
->features
& DASD_FEATURE_USERAW
) {
3215 * the max_blocks value for raw_track access is 256
3216 * it is higher than the native ECKD value because we
3217 * only need one ccw per track
3218 * so the max_hw_sectors are
3219 * 2048 x 512B = 1024kB = 16 tracks
3223 max
= block
->base
->discipline
->max_blocks
<< block
->s2b_shift
;
3225 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, q
);
3226 q
->limits
.max_dev_sectors
= max
;
3227 blk_queue_logical_block_size(q
, logical_block_size
);
3228 blk_queue_max_hw_sectors(q
, max
);
3229 blk_queue_max_segments(q
, USHRT_MAX
);
3230 /* with page sized segments we can translate each segement into
3233 blk_queue_max_segment_size(q
, PAGE_SIZE
);
3234 blk_queue_segment_boundary(q
, PAGE_SIZE
- 1);
3236 /* Only activate blocklayer discard support for devices that support it */
3237 if (block
->base
->features
& DASD_FEATURE_DISCARD
) {
3238 q
->limits
.discard_granularity
= logical_block_size
;
3239 q
->limits
.discard_alignment
= PAGE_SIZE
;
3241 /* Calculate max_discard_sectors and make it PAGE aligned */
3242 max_bytes
= USHRT_MAX
* logical_block_size
;
3243 max_bytes
= ALIGN(max_bytes
, PAGE_SIZE
) - PAGE_SIZE
;
3244 max_discard_sectors
= max_bytes
/ logical_block_size
;
3246 blk_queue_max_discard_sectors(q
, max_discard_sectors
);
3247 blk_queue_max_write_zeroes_sectors(q
, max_discard_sectors
);
3248 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, q
);
3253 * Deactivate and free request queue.
3255 static void dasd_free_queue(struct dasd_block
*block
)
3257 if (block
->request_queue
) {
3258 blk_cleanup_queue(block
->request_queue
);
3259 blk_mq_free_tag_set(&block
->tag_set
);
3260 block
->request_queue
= NULL
;
3264 static int dasd_open(struct block_device
*bdev
, fmode_t mode
)
3266 struct dasd_device
*base
;
3269 base
= dasd_device_from_gendisk(bdev
->bd_disk
);
3273 atomic_inc(&base
->block
->open_count
);
3274 if (test_bit(DASD_FLAG_OFFLINE
, &base
->flags
)) {
3279 if (!try_module_get(base
->discipline
->owner
)) {
3284 if (dasd_probeonly
) {
3285 dev_info(&base
->cdev
->dev
,
3286 "Accessing the DASD failed because it is in "
3287 "probeonly mode\n");
3292 if (base
->state
<= DASD_STATE_BASIC
) {
3293 DBF_DEV_EVENT(DBF_ERR
, base
, " %s",
3294 " Cannot open unrecognized device");
3299 if ((mode
& FMODE_WRITE
) &&
3300 (test_bit(DASD_FLAG_DEVICE_RO
, &base
->flags
) ||
3301 (base
->features
& DASD_FEATURE_READONLY
))) {
3306 dasd_put_device(base
);
3310 module_put(base
->discipline
->owner
);
3312 atomic_dec(&base
->block
->open_count
);
3313 dasd_put_device(base
);
3317 static void dasd_release(struct gendisk
*disk
, fmode_t mode
)
3319 struct dasd_device
*base
= dasd_device_from_gendisk(disk
);
3321 atomic_dec(&base
->block
->open_count
);
3322 module_put(base
->discipline
->owner
);
3323 dasd_put_device(base
);
3328 * Return disk geometry.
3330 static int dasd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
3332 struct dasd_device
*base
;
3334 base
= dasd_device_from_gendisk(bdev
->bd_disk
);
3338 if (!base
->discipline
||
3339 !base
->discipline
->fill_geometry
) {
3340 dasd_put_device(base
);
3343 base
->discipline
->fill_geometry(base
->block
, geo
);
3344 geo
->start
= get_start_sect(bdev
) >> base
->block
->s2b_shift
;
3345 dasd_put_device(base
);
3349 const struct block_device_operations
3350 dasd_device_operations
= {
3351 .owner
= THIS_MODULE
,
3353 .release
= dasd_release
,
3354 .ioctl
= dasd_ioctl
,
3355 .compat_ioctl
= dasd_ioctl
,
3356 .getgeo
= dasd_getgeo
,
3359 /*******************************************************************************
3360 * end of block device operations
3366 #ifdef CONFIG_PROC_FS
3370 if (dasd_page_cache
!= NULL
) {
3371 kmem_cache_destroy(dasd_page_cache
);
3372 dasd_page_cache
= NULL
;
3374 dasd_gendisk_exit();
3376 if (dasd_debug_area
!= NULL
) {
3377 debug_unregister(dasd_debug_area
);
3378 dasd_debug_area
= NULL
;
3380 dasd_statistics_removeroot();
3384 * SECTION: common functions for ccw_driver use
3388 * Is the device read-only?
3389 * Note that this function does not report the setting of the
3390 * readonly device attribute, but how it is configured in z/VM.
3392 int dasd_device_is_ro(struct dasd_device
*device
)
3394 struct ccw_dev_id dev_id
;
3395 struct diag210 diag_data
;
3400 ccw_device_get_id(device
->cdev
, &dev_id
);
3401 memset(&diag_data
, 0, sizeof(diag_data
));
3402 diag_data
.vrdcdvno
= dev_id
.devno
;
3403 diag_data
.vrdclen
= sizeof(diag_data
);
3404 rc
= diag210(&diag_data
);
3405 if (rc
== 0 || rc
== 2) {
3406 return diag_data
.vrdcvfla
& 0x80;
3408 DBF_EVENT(DBF_WARNING
, "diag210 failed for dev=%04x with rc=%d",
3413 EXPORT_SYMBOL_GPL(dasd_device_is_ro
);
3415 static void dasd_generic_auto_online(void *data
, async_cookie_t cookie
)
3417 struct ccw_device
*cdev
= data
;
3420 ret
= ccw_device_set_online(cdev
);
3422 pr_warn("%s: Setting the DASD online failed with rc=%d\n",
3423 dev_name(&cdev
->dev
), ret
);
3427 * Initial attempt at a probe function. this can be simplified once
3428 * the other detection code is gone.
3430 int dasd_generic_probe(struct ccw_device
*cdev
,
3431 struct dasd_discipline
*discipline
)
3435 ret
= dasd_add_sysfs_files(cdev
);
3437 DBF_EVENT_DEVID(DBF_WARNING
, cdev
, "%s",
3438 "dasd_generic_probe: could not add "
3442 cdev
->handler
= &dasd_int_handler
;
3445 * Automatically online either all dasd devices (dasd_autodetect)
3446 * or all devices specified with dasd= parameters during
3449 if ((dasd_get_feature(cdev
, DASD_FEATURE_INITIAL_ONLINE
) > 0 ) ||
3450 (dasd_autodetect
&& dasd_busid_known(dev_name(&cdev
->dev
)) != 0))
3451 async_schedule(dasd_generic_auto_online
, cdev
);
3454 EXPORT_SYMBOL_GPL(dasd_generic_probe
);
3456 void dasd_generic_free_discipline(struct dasd_device
*device
)
3458 /* Forget the discipline information. */
3459 if (device
->discipline
) {
3460 if (device
->discipline
->uncheck_device
)
3461 device
->discipline
->uncheck_device(device
);
3462 module_put(device
->discipline
->owner
);
3463 device
->discipline
= NULL
;
3465 if (device
->base_discipline
) {
3466 module_put(device
->base_discipline
->owner
);
3467 device
->base_discipline
= NULL
;
3470 EXPORT_SYMBOL_GPL(dasd_generic_free_discipline
);
3473 * This will one day be called from a global not_oper handler.
3474 * It is also used by driver_unregister during module unload.
3476 void dasd_generic_remove(struct ccw_device
*cdev
)
3478 struct dasd_device
*device
;
3479 struct dasd_block
*block
;
3481 cdev
->handler
= NULL
;
3483 device
= dasd_device_from_cdev(cdev
);
3484 if (IS_ERR(device
)) {
3485 dasd_remove_sysfs_files(cdev
);
3488 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
) &&
3489 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
3490 /* Already doing offline processing */
3491 dasd_put_device(device
);
3492 dasd_remove_sysfs_files(cdev
);
3496 * This device is removed unconditionally. Set offline
3497 * flag to prevent dasd_open from opening it while it is
3498 * no quite down yet.
3500 dasd_set_target_state(device
, DASD_STATE_NEW
);
3501 /* dasd_delete_device destroys the device reference. */
3502 block
= device
->block
;
3503 dasd_delete_device(device
);
3505 * life cycle of block is bound to device, so delete it after
3506 * device was safely removed
3509 dasd_free_block(block
);
3511 dasd_remove_sysfs_files(cdev
);
3513 EXPORT_SYMBOL_GPL(dasd_generic_remove
);
3516 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
3517 * the device is detected for the first time and is supposed to be used
3518 * or the user has started activation through sysfs.
3520 int dasd_generic_set_online(struct ccw_device
*cdev
,
3521 struct dasd_discipline
*base_discipline
)
3523 struct dasd_discipline
*discipline
;
3524 struct dasd_device
*device
;
3527 /* first online clears initial online feature flag */
3528 dasd_set_feature(cdev
, DASD_FEATURE_INITIAL_ONLINE
, 0);
3529 device
= dasd_create_device(cdev
);
3531 return PTR_ERR(device
);
3533 discipline
= base_discipline
;
3534 if (device
->features
& DASD_FEATURE_USEDIAG
) {
3535 if (!dasd_diag_discipline_pointer
) {
3536 /* Try to load the required module. */
3537 rc
= request_module(DASD_DIAG_MOD
);
3539 pr_warn("%s Setting the DASD online failed "
3540 "because the required module %s "
3541 "could not be loaded (rc=%d)\n",
3542 dev_name(&cdev
->dev
), DASD_DIAG_MOD
,
3544 dasd_delete_device(device
);
3548 /* Module init could have failed, so check again here after
3549 * request_module(). */
3550 if (!dasd_diag_discipline_pointer
) {
3551 pr_warn("%s Setting the DASD online failed because of missing DIAG discipline\n",
3552 dev_name(&cdev
->dev
));
3553 dasd_delete_device(device
);
3556 discipline
= dasd_diag_discipline_pointer
;
3558 if (!try_module_get(base_discipline
->owner
)) {
3559 dasd_delete_device(device
);
3562 if (!try_module_get(discipline
->owner
)) {
3563 module_put(base_discipline
->owner
);
3564 dasd_delete_device(device
);
3567 device
->base_discipline
= base_discipline
;
3568 device
->discipline
= discipline
;
3570 /* check_device will allocate block device if necessary */
3571 rc
= discipline
->check_device(device
);
3573 pr_warn("%s Setting the DASD online with discipline %s failed with rc=%i\n",
3574 dev_name(&cdev
->dev
), discipline
->name
, rc
);
3575 module_put(discipline
->owner
);
3576 module_put(base_discipline
->owner
);
3577 dasd_delete_device(device
);
3581 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
3582 if (device
->state
<= DASD_STATE_KNOWN
) {
3583 pr_warn("%s Setting the DASD online failed because of a missing discipline\n",
3584 dev_name(&cdev
->dev
));
3586 dasd_set_target_state(device
, DASD_STATE_NEW
);
3588 dasd_free_block(device
->block
);
3589 dasd_delete_device(device
);
3591 pr_debug("dasd_generic device %s found\n",
3592 dev_name(&cdev
->dev
));
3594 wait_event(dasd_init_waitq
, _wait_for_device(device
));
3596 dasd_put_device(device
);
3599 EXPORT_SYMBOL_GPL(dasd_generic_set_online
);
3601 int dasd_generic_set_offline(struct ccw_device
*cdev
)
3603 struct dasd_device
*device
;
3604 struct dasd_block
*block
;
3605 int max_count
, open_count
, rc
;
3606 unsigned long flags
;
3609 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
3610 device
= dasd_device_from_cdev_locked(cdev
);
3611 if (IS_ERR(device
)) {
3612 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
3613 return PTR_ERR(device
);
3617 * We must make sure that this device is currently not in use.
3618 * The open_count is increased for every opener, that includes
3619 * the blkdev_get in dasd_scan_partitions. We are only interested
3620 * in the other openers.
3622 if (device
->block
) {
3623 max_count
= device
->block
->bdev
? 0 : -1;
3624 open_count
= atomic_read(&device
->block
->open_count
);
3625 if (open_count
> max_count
) {
3627 pr_warn("%s: The DASD cannot be set offline with open count %i\n",
3628 dev_name(&cdev
->dev
), open_count
);
3630 pr_warn("%s: The DASD cannot be set offline while it is in use\n",
3631 dev_name(&cdev
->dev
));
3638 * Test if the offline processing is already running and exit if so.
3639 * If a safe offline is being processed this could only be a normal
3640 * offline that should be able to overtake the safe offline and
3641 * cancel any I/O we do not want to wait for any longer
3643 if (test_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
3644 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
3645 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
,
3652 set_bit(DASD_FLAG_OFFLINE
, &device
->flags
);
3655 * if safe_offline is called set safe_offline_running flag and
3656 * clear safe_offline so that a call to normal offline
3657 * can overrun safe_offline processing
3659 if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE
, &device
->flags
) &&
3660 !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
3661 /* need to unlock here to wait for outstanding I/O */
3662 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
3664 * If we want to set the device safe offline all IO operations
3665 * should be finished before continuing the offline process
3666 * so sync bdev first and then wait for our queues to become
3669 if (device
->block
) {
3670 rc
= fsync_bdev(device
->block
->bdev
);
3674 dasd_schedule_device_bh(device
);
3675 rc
= wait_event_interruptible(shutdown_waitq
,
3676 _wait_for_empty_queues(device
));
3681 * check if a normal offline process overtook the offline
3682 * processing in this case simply do nothing beside returning
3683 * that we got interrupted
3684 * otherwise mark safe offline as not running any longer and
3685 * continue with normal offline
3687 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
3688 if (!test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
3692 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
);
3694 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
3696 dasd_set_target_state(device
, DASD_STATE_NEW
);
3697 /* dasd_delete_device destroys the device reference. */
3698 block
= device
->block
;
3699 dasd_delete_device(device
);
3701 * life cycle of block is bound to device, so delete it after
3702 * device was safely removed
3705 dasd_free_block(block
);
3710 /* interrupted by signal */
3711 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
3712 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
);
3713 clear_bit(DASD_FLAG_OFFLINE
, &device
->flags
);
3715 dasd_put_device(device
);
3716 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
3719 EXPORT_SYMBOL_GPL(dasd_generic_set_offline
);
3721 int dasd_generic_last_path_gone(struct dasd_device
*device
)
3723 struct dasd_ccw_req
*cqr
;
3725 dev_warn(&device
->cdev
->dev
, "No operational channel path is left "
3726 "for the device\n");
3727 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s", "last path gone");
3728 /* First of all call extended error reporting. */
3729 dasd_eer_write(device
, NULL
, DASD_EER_NOPATH
);
3731 if (device
->state
< DASD_STATE_BASIC
)
3733 /* Device is active. We want to keep it. */
3734 list_for_each_entry(cqr
, &device
->ccw_queue
, devlist
)
3735 if ((cqr
->status
== DASD_CQR_IN_IO
) ||
3736 (cqr
->status
== DASD_CQR_CLEAR_PENDING
)) {
3737 cqr
->status
= DASD_CQR_QUEUED
;
3740 dasd_device_set_stop_bits(device
, DASD_STOPPED_DC_WAIT
);
3741 dasd_device_clear_timer(device
);
3742 dasd_schedule_device_bh(device
);
3745 EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone
);
3747 int dasd_generic_path_operational(struct dasd_device
*device
)
3749 dev_info(&device
->cdev
->dev
, "A channel path to the device has become "
3751 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s", "path operational");
3752 dasd_device_remove_stop_bits(device
, DASD_STOPPED_DC_WAIT
);
3753 if (device
->stopped
& DASD_UNRESUMED_PM
) {
3754 dasd_device_remove_stop_bits(device
, DASD_UNRESUMED_PM
);
3755 dasd_restore_device(device
);
3758 dasd_schedule_device_bh(device
);
3759 if (device
->block
) {
3760 dasd_schedule_block_bh(device
->block
);
3761 if (device
->block
->request_queue
)
3762 blk_mq_run_hw_queues(device
->block
->request_queue
,
3766 if (!device
->stopped
)
3767 wake_up(&generic_waitq
);
3771 EXPORT_SYMBOL_GPL(dasd_generic_path_operational
);
3773 int dasd_generic_notify(struct ccw_device
*cdev
, int event
)
3775 struct dasd_device
*device
;
3778 device
= dasd_device_from_cdev_locked(cdev
);
3786 dasd_path_no_path(device
);
3787 ret
= dasd_generic_last_path_gone(device
);
3791 if (dasd_path_get_opm(device
))
3792 ret
= dasd_generic_path_operational(device
);
3795 dasd_put_device(device
);
3798 EXPORT_SYMBOL_GPL(dasd_generic_notify
);
3800 void dasd_generic_path_event(struct ccw_device
*cdev
, int *path_event
)
3802 struct dasd_device
*device
;
3803 int chp
, oldopm
, hpfpm
, ifccpm
;
3805 device
= dasd_device_from_cdev_locked(cdev
);
3809 oldopm
= dasd_path_get_opm(device
);
3810 for (chp
= 0; chp
< 8; chp
++) {
3811 if (path_event
[chp
] & PE_PATH_GONE
) {
3812 dasd_path_notoper(device
, chp
);
3814 if (path_event
[chp
] & PE_PATH_AVAILABLE
) {
3815 dasd_path_available(device
, chp
);
3816 dasd_schedule_device_bh(device
);
3818 if (path_event
[chp
] & PE_PATHGROUP_ESTABLISHED
) {
3819 if (!dasd_path_is_operational(device
, chp
) &&
3820 !dasd_path_need_verify(device
, chp
)) {
3822 * we can not establish a pathgroup on an
3823 * unavailable path, so trigger a path
3824 * verification first
3826 dasd_path_available(device
, chp
);
3827 dasd_schedule_device_bh(device
);
3829 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
3830 "Pathgroup re-established\n");
3831 if (device
->discipline
->kick_validate
)
3832 device
->discipline
->kick_validate(device
);
3835 hpfpm
= dasd_path_get_hpfpm(device
);
3836 ifccpm
= dasd_path_get_ifccpm(device
);
3837 if (!dasd_path_get_opm(device
) && hpfpm
) {
3839 * device has no operational paths but at least one path is
3840 * disabled due to HPF errors
3841 * disable HPF at all and use the path(s) again
3843 if (device
->discipline
->disable_hpf
)
3844 device
->discipline
->disable_hpf(device
);
3845 dasd_device_set_stop_bits(device
, DASD_STOPPED_NOT_ACC
);
3846 dasd_path_set_tbvpm(device
, hpfpm
);
3847 dasd_schedule_device_bh(device
);
3848 dasd_schedule_requeue(device
);
3849 } else if (!dasd_path_get_opm(device
) && ifccpm
) {
3851 * device has no operational paths but at least one path is
3852 * disabled due to IFCC errors
3853 * trigger path verification on paths with IFCC errors
3855 dasd_path_set_tbvpm(device
, ifccpm
);
3856 dasd_schedule_device_bh(device
);
3858 if (oldopm
&& !dasd_path_get_opm(device
) && !hpfpm
&& !ifccpm
) {
3859 dev_warn(&device
->cdev
->dev
,
3860 "No verified channel paths remain for the device\n");
3861 DBF_DEV_EVENT(DBF_WARNING
, device
,
3862 "%s", "last verified path gone");
3863 dasd_eer_write(device
, NULL
, DASD_EER_NOPATH
);
3864 dasd_device_set_stop_bits(device
,
3865 DASD_STOPPED_DC_WAIT
);
3867 dasd_put_device(device
);
3869 EXPORT_SYMBOL_GPL(dasd_generic_path_event
);
3871 int dasd_generic_verify_path(struct dasd_device
*device
, __u8 lpm
)
3873 if (!dasd_path_get_opm(device
) && lpm
) {
3874 dasd_path_set_opm(device
, lpm
);
3875 dasd_generic_path_operational(device
);
3877 dasd_path_add_opm(device
, lpm
);
3880 EXPORT_SYMBOL_GPL(dasd_generic_verify_path
);
3883 * clear active requests and requeue them to block layer if possible
3885 static int dasd_generic_requeue_all_requests(struct dasd_device
*device
)
3887 struct list_head requeue_queue
;
3888 struct dasd_ccw_req
*cqr
, *n
;
3889 struct dasd_ccw_req
*refers
;
3892 INIT_LIST_HEAD(&requeue_queue
);
3893 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
3895 list_for_each_entry_safe(cqr
, n
, &device
->ccw_queue
, devlist
) {
3896 /* Check status and move request to flush_queue */
3897 if (cqr
->status
== DASD_CQR_IN_IO
) {
3898 rc
= device
->discipline
->term_IO(cqr
);
3900 /* unable to terminate requeust */
3901 dev_err(&device
->cdev
->dev
,
3902 "Unable to terminate request %p "
3903 "on suspend\n", cqr
);
3904 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
3905 dasd_put_device(device
);
3909 list_move_tail(&cqr
->devlist
, &requeue_queue
);
3911 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
3913 list_for_each_entry_safe(cqr
, n
, &requeue_queue
, devlist
) {
3914 wait_event(dasd_flush_wq
,
3915 (cqr
->status
!= DASD_CQR_CLEAR_PENDING
));
3917 /* mark sleepon requests as ended */
3918 if (cqr
->callback_data
== DASD_SLEEPON_START_TAG
)
3919 cqr
->callback_data
= DASD_SLEEPON_END_TAG
;
3921 /* remove requests from device and block queue */
3922 list_del_init(&cqr
->devlist
);
3923 while (cqr
->refers
!= NULL
) {
3924 refers
= cqr
->refers
;
3925 /* remove the request from the block queue */
3926 list_del(&cqr
->blocklist
);
3927 /* free the finished erp request */
3928 dasd_free_erp_request(cqr
, cqr
->memdev
);
3933 * requeue requests to blocklayer will only work
3934 * for block device requests
3936 if (_dasd_requeue_request(cqr
))
3940 list_del_init(&cqr
->blocklist
);
3941 cqr
->block
->base
->discipline
->free_cp(
3942 cqr
, (struct request
*) cqr
->callback_data
);
3946 * if requests remain then they are internal request
3947 * and go back to the device queue
3949 if (!list_empty(&requeue_queue
)) {
3950 /* move freeze_queue to start of the ccw_queue */
3951 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
3952 list_splice_tail(&requeue_queue
, &device
->ccw_queue
);
3953 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
3955 /* wake up generic waitqueue for eventually ended sleepon requests */
3956 wake_up(&generic_waitq
);
3960 static void do_requeue_requests(struct work_struct
*work
)
3962 struct dasd_device
*device
= container_of(work
, struct dasd_device
,
3964 dasd_generic_requeue_all_requests(device
);
3965 dasd_device_remove_stop_bits(device
, DASD_STOPPED_NOT_ACC
);
3967 dasd_schedule_block_bh(device
->block
);
3968 dasd_put_device(device
);
3971 void dasd_schedule_requeue(struct dasd_device
*device
)
3973 dasd_get_device(device
);
3974 /* queue call to dasd_reload_device to the kernel event daemon. */
3975 if (!schedule_work(&device
->requeue_requests
))
3976 dasd_put_device(device
);
3978 EXPORT_SYMBOL(dasd_schedule_requeue
);
3980 int dasd_generic_pm_freeze(struct ccw_device
*cdev
)
3982 struct dasd_device
*device
= dasd_device_from_cdev(cdev
);
3985 return PTR_ERR(device
);
3987 /* mark device as suspended */
3988 set_bit(DASD_FLAG_SUSPENDED
, &device
->flags
);
3990 if (device
->discipline
->freeze
)
3991 device
->discipline
->freeze(device
);
3993 /* disallow new I/O */
3994 dasd_device_set_stop_bits(device
, DASD_STOPPED_PM
);
3996 return dasd_generic_requeue_all_requests(device
);
3998 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze
);
4000 int dasd_generic_restore_device(struct ccw_device
*cdev
)
4002 struct dasd_device
*device
= dasd_device_from_cdev(cdev
);
4006 return PTR_ERR(device
);
4008 /* allow new IO again */
4009 dasd_device_remove_stop_bits(device
,
4010 (DASD_STOPPED_PM
| DASD_UNRESUMED_PM
));
4012 dasd_schedule_device_bh(device
);
4015 * call discipline restore function
4016 * if device is stopped do nothing e.g. for disconnected devices
4018 if (device
->discipline
->restore
&& !(device
->stopped
))
4019 rc
= device
->discipline
->restore(device
);
4020 if (rc
|| device
->stopped
)
4022 * if the resume failed for the DASD we put it in
4023 * an UNRESUMED stop state
4025 device
->stopped
|= DASD_UNRESUMED_PM
;
4027 if (device
->block
) {
4028 dasd_schedule_block_bh(device
->block
);
4029 if (device
->block
->request_queue
)
4030 blk_mq_run_hw_queues(device
->block
->request_queue
,
4034 clear_bit(DASD_FLAG_SUSPENDED
, &device
->flags
);
4035 dasd_put_device(device
);
4038 EXPORT_SYMBOL_GPL(dasd_generic_restore_device
);
4040 static struct dasd_ccw_req
*dasd_generic_build_rdc(struct dasd_device
*device
,
4042 int rdc_buffer_size
,
4045 struct dasd_ccw_req
*cqr
;
4047 unsigned long *idaw
;
4049 cqr
= dasd_smalloc_request(magic
, 1 /* RDC */, rdc_buffer_size
, device
);
4052 /* internal error 13 - Allocating the RDC request failed*/
4053 dev_err(&device
->cdev
->dev
,
4054 "An error occurred in the DASD device driver, "
4055 "reason=%s\n", "13");
4060 ccw
->cmd_code
= CCW_CMD_RDC
;
4061 if (idal_is_needed(rdc_buffer
, rdc_buffer_size
)) {
4062 idaw
= (unsigned long *) (cqr
->data
);
4063 ccw
->cda
= (__u32
)(addr_t
) idaw
;
4064 ccw
->flags
= CCW_FLAG_IDA
;
4065 idaw
= idal_create_words(idaw
, rdc_buffer
, rdc_buffer_size
);
4067 ccw
->cda
= (__u32
)(addr_t
) rdc_buffer
;
4071 ccw
->count
= rdc_buffer_size
;
4072 cqr
->startdev
= device
;
4073 cqr
->memdev
= device
;
4074 cqr
->expires
= 10*HZ
;
4076 cqr
->buildclk
= get_tod_clock();
4077 cqr
->status
= DASD_CQR_FILLED
;
4082 int dasd_generic_read_dev_chars(struct dasd_device
*device
, int magic
,
4083 void *rdc_buffer
, int rdc_buffer_size
)
4086 struct dasd_ccw_req
*cqr
;
4088 cqr
= dasd_generic_build_rdc(device
, rdc_buffer
, rdc_buffer_size
,
4091 return PTR_ERR(cqr
);
4093 ret
= dasd_sleep_on(cqr
);
4094 dasd_sfree_request(cqr
, cqr
->memdev
);
4097 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars
);
4100 * In command mode and transport mode we need to look for sense
4101 * data in different places. The sense data itself is allways
4102 * an array of 32 bytes, so we can unify the sense data access
4105 char *dasd_get_sense(struct irb
*irb
)
4107 struct tsb
*tsb
= NULL
;
4110 if (scsw_is_tm(&irb
->scsw
) && (irb
->scsw
.tm
.fcxs
== 0x01)) {
4111 if (irb
->scsw
.tm
.tcw
)
4112 tsb
= tcw_get_tsb((struct tcw
*)(unsigned long)
4114 if (tsb
&& tsb
->length
== 64 && tsb
->flags
)
4115 switch (tsb
->flags
& 0x07) {
4116 case 1: /* tsa_iostat */
4117 sense
= tsb
->tsa
.iostat
.sense
;
4119 case 2: /* tsa_ddpc */
4120 sense
= tsb
->tsa
.ddpc
.sense
;
4123 /* currently we don't use interrogate data */
4126 } else if (irb
->esw
.esw0
.erw
.cons
) {
4131 EXPORT_SYMBOL_GPL(dasd_get_sense
);
4133 void dasd_generic_shutdown(struct ccw_device
*cdev
)
4135 struct dasd_device
*device
;
4137 device
= dasd_device_from_cdev(cdev
);
4142 dasd_schedule_block_bh(device
->block
);
4144 dasd_schedule_device_bh(device
);
4146 wait_event(shutdown_waitq
, _wait_for_empty_queues(device
));
4148 EXPORT_SYMBOL_GPL(dasd_generic_shutdown
);
4150 static int __init
dasd_init(void)
4154 init_waitqueue_head(&dasd_init_waitq
);
4155 init_waitqueue_head(&dasd_flush_wq
);
4156 init_waitqueue_head(&generic_waitq
);
4157 init_waitqueue_head(&shutdown_waitq
);
4159 /* register 'common' DASD debug area, used for all DBF_XXX calls */
4160 dasd_debug_area
= debug_register("dasd", 1, 1, 8 * sizeof(long));
4161 if (dasd_debug_area
== NULL
) {
4165 debug_register_view(dasd_debug_area
, &debug_sprintf_view
);
4166 debug_set_level(dasd_debug_area
, DBF_WARNING
);
4168 DBF_EVENT(DBF_EMERG
, "%s", "debug area created");
4170 dasd_diag_discipline_pointer
= NULL
;
4172 dasd_statistics_createroot();
4174 rc
= dasd_devmap_init();
4177 rc
= dasd_gendisk_init();
4183 rc
= dasd_eer_init();
4186 #ifdef CONFIG_PROC_FS
4187 rc
= dasd_proc_init();
4194 pr_info("The DASD device driver could not be initialized\n");
4199 module_init(dasd_init
);
4200 module_exit(dasd_exit
);