2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Horst Hummel <Horst.Hummel@de.ibm.com>
4 * Carsten Otte <Cotte@de.ibm.com>
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
7 * Copyright IBM Corp. 1999, 2009
10 #define KMSG_COMPONENT "dasd"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13 #include <linux/kmod.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/ctype.h>
17 #include <linux/major.h>
18 #include <linux/slab.h>
19 #include <linux/hdreg.h>
20 #include <linux/async.h>
21 #include <linux/mutex.h>
22 #include <linux/debugfs.h>
23 #include <linux/seq_file.h>
24 #include <linux/vmalloc.h>
26 #include <asm/ccwdev.h>
27 #include <asm/ebcdic.h>
28 #include <asm/idals.h>
33 #define PRINTK_HEADER "dasd:"
37 * SECTION: Constant definitions to be used within this file
39 #define DASD_CHANQ_MAX_SIZE 4
41 #define DASD_DIAG_MOD "dasd_diag_mod"
44 * SECTION: exported variables of dasd.c
46 debug_info_t
*dasd_debug_area
;
47 EXPORT_SYMBOL(dasd_debug_area
);
48 static struct dentry
*dasd_debugfs_root_entry
;
49 struct dasd_discipline
*dasd_diag_discipline_pointer
;
50 EXPORT_SYMBOL(dasd_diag_discipline_pointer
);
51 void dasd_int_handler(struct ccw_device
*, unsigned long, struct irb
*);
53 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
54 MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
55 " Copyright IBM Corp. 2000");
56 MODULE_SUPPORTED_DEVICE("dasd");
57 MODULE_LICENSE("GPL");
60 * SECTION: prototypes for static functions of dasd.c
62 static int dasd_alloc_queue(struct dasd_block
*);
63 static void dasd_setup_queue(struct dasd_block
*);
64 static void dasd_free_queue(struct dasd_block
*);
65 static int dasd_flush_block_queue(struct dasd_block
*);
66 static void dasd_device_tasklet(struct dasd_device
*);
67 static void dasd_block_tasklet(struct dasd_block
*);
68 static void do_kick_device(struct work_struct
*);
69 static void do_restore_device(struct work_struct
*);
70 static void do_reload_device(struct work_struct
*);
71 static void do_requeue_requests(struct work_struct
*);
72 static void dasd_return_cqr_cb(struct dasd_ccw_req
*, void *);
73 static void dasd_device_timeout(unsigned long);
74 static void dasd_block_timeout(unsigned long);
75 static void __dasd_process_erp(struct dasd_device
*, struct dasd_ccw_req
*);
76 static void dasd_profile_init(struct dasd_profile
*, struct dentry
*);
77 static void dasd_profile_exit(struct dasd_profile
*);
78 static void dasd_hosts_init(struct dentry
*, struct dasd_device
*);
79 static void dasd_hosts_exit(struct dasd_device
*);
82 * SECTION: Operations on the device structure.
84 static wait_queue_head_t dasd_init_waitq
;
85 static wait_queue_head_t dasd_flush_wq
;
86 static wait_queue_head_t generic_waitq
;
87 static wait_queue_head_t shutdown_waitq
;
90 * Allocate memory for a new device structure.
92 struct dasd_device
*dasd_alloc_device(void)
94 struct dasd_device
*device
;
96 device
= kzalloc(sizeof(struct dasd_device
), GFP_ATOMIC
);
98 return ERR_PTR(-ENOMEM
);
100 /* Get two pages for normal block device operations. */
101 device
->ccw_mem
= (void *) __get_free_pages(GFP_ATOMIC
| GFP_DMA
, 1);
102 if (!device
->ccw_mem
) {
104 return ERR_PTR(-ENOMEM
);
106 /* Get one page for error recovery. */
107 device
->erp_mem
= (void *) get_zeroed_page(GFP_ATOMIC
| GFP_DMA
);
108 if (!device
->erp_mem
) {
109 free_pages((unsigned long) device
->ccw_mem
, 1);
111 return ERR_PTR(-ENOMEM
);
114 dasd_init_chunklist(&device
->ccw_chunks
, device
->ccw_mem
, PAGE_SIZE
*2);
115 dasd_init_chunklist(&device
->erp_chunks
, device
->erp_mem
, PAGE_SIZE
);
116 spin_lock_init(&device
->mem_lock
);
117 atomic_set(&device
->tasklet_scheduled
, 0);
118 tasklet_init(&device
->tasklet
,
119 (void (*)(unsigned long)) dasd_device_tasklet
,
120 (unsigned long) device
);
121 INIT_LIST_HEAD(&device
->ccw_queue
);
122 init_timer(&device
->timer
);
123 device
->timer
.function
= dasd_device_timeout
;
124 device
->timer
.data
= (unsigned long) device
;
125 INIT_WORK(&device
->kick_work
, do_kick_device
);
126 INIT_WORK(&device
->restore_device
, do_restore_device
);
127 INIT_WORK(&device
->reload_device
, do_reload_device
);
128 INIT_WORK(&device
->requeue_requests
, do_requeue_requests
);
129 device
->state
= DASD_STATE_NEW
;
130 device
->target
= DASD_STATE_NEW
;
131 mutex_init(&device
->state_mutex
);
132 spin_lock_init(&device
->profile
.lock
);
137 * Free memory of a device structure.
139 void dasd_free_device(struct dasd_device
*device
)
141 kfree(device
->private);
142 free_page((unsigned long) device
->erp_mem
);
143 free_pages((unsigned long) device
->ccw_mem
, 1);
148 * Allocate memory for a new device structure.
150 struct dasd_block
*dasd_alloc_block(void)
152 struct dasd_block
*block
;
154 block
= kzalloc(sizeof(*block
), GFP_ATOMIC
);
156 return ERR_PTR(-ENOMEM
);
157 /* open_count = 0 means device online but not in use */
158 atomic_set(&block
->open_count
, -1);
160 atomic_set(&block
->tasklet_scheduled
, 0);
161 tasklet_init(&block
->tasklet
,
162 (void (*)(unsigned long)) dasd_block_tasklet
,
163 (unsigned long) block
);
164 INIT_LIST_HEAD(&block
->ccw_queue
);
165 spin_lock_init(&block
->queue_lock
);
166 init_timer(&block
->timer
);
167 block
->timer
.function
= dasd_block_timeout
;
168 block
->timer
.data
= (unsigned long) block
;
169 spin_lock_init(&block
->profile
.lock
);
173 EXPORT_SYMBOL_GPL(dasd_alloc_block
);
176 * Free memory of a device structure.
178 void dasd_free_block(struct dasd_block
*block
)
182 EXPORT_SYMBOL_GPL(dasd_free_block
);
185 * Make a new device known to the system.
187 static int dasd_state_new_to_known(struct dasd_device
*device
)
192 * As long as the device is not in state DASD_STATE_NEW we want to
193 * keep the reference count > 0.
195 dasd_get_device(device
);
198 rc
= dasd_alloc_queue(device
->block
);
200 dasd_put_device(device
);
204 device
->state
= DASD_STATE_KNOWN
;
209 * Let the system forget about a device.
211 static int dasd_state_known_to_new(struct dasd_device
*device
)
213 /* Disable extended error reporting for this device. */
214 dasd_eer_disable(device
);
215 device
->state
= DASD_STATE_NEW
;
218 dasd_free_queue(device
->block
);
220 /* Give up reference we took in dasd_state_new_to_known. */
221 dasd_put_device(device
);
225 static struct dentry
*dasd_debugfs_setup(const char *name
,
226 struct dentry
*base_dentry
)
232 pde
= debugfs_create_dir(name
, base_dentry
);
233 if (!pde
|| IS_ERR(pde
))
239 * Request the irq line for the device.
241 static int dasd_state_known_to_basic(struct dasd_device
*device
)
243 struct dasd_block
*block
= device
->block
;
246 /* Allocate and register gendisk structure. */
248 rc
= dasd_gendisk_alloc(block
);
251 block
->debugfs_dentry
=
252 dasd_debugfs_setup(block
->gdp
->disk_name
,
253 dasd_debugfs_root_entry
);
254 dasd_profile_init(&block
->profile
, block
->debugfs_dentry
);
255 if (dasd_global_profile_level
== DASD_PROFILE_ON
)
256 dasd_profile_on(&device
->block
->profile
);
258 device
->debugfs_dentry
=
259 dasd_debugfs_setup(dev_name(&device
->cdev
->dev
),
260 dasd_debugfs_root_entry
);
261 dasd_profile_init(&device
->profile
, device
->debugfs_dentry
);
262 dasd_hosts_init(device
->debugfs_dentry
, device
);
264 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
265 device
->debug_area
= debug_register(dev_name(&device
->cdev
->dev
), 4, 1,
267 debug_register_view(device
->debug_area
, &debug_sprintf_view
);
268 debug_set_level(device
->debug_area
, DBF_WARNING
);
269 DBF_DEV_EVENT(DBF_EMERG
, device
, "%s", "debug area created");
271 device
->state
= DASD_STATE_BASIC
;
277 * Release the irq line for the device. Terminate any running i/o.
279 static int dasd_state_basic_to_known(struct dasd_device
*device
)
283 if (device
->discipline
->basic_to_known
) {
284 rc
= device
->discipline
->basic_to_known(device
);
290 dasd_profile_exit(&device
->block
->profile
);
291 debugfs_remove(device
->block
->debugfs_dentry
);
292 dasd_gendisk_free(device
->block
);
293 dasd_block_clear_timer(device
->block
);
295 rc
= dasd_flush_device_queue(device
);
298 dasd_device_clear_timer(device
);
299 dasd_profile_exit(&device
->profile
);
300 dasd_hosts_exit(device
);
301 debugfs_remove(device
->debugfs_dentry
);
302 DBF_DEV_EVENT(DBF_EMERG
, device
, "%p debug area deleted", device
);
303 if (device
->debug_area
!= NULL
) {
304 debug_unregister(device
->debug_area
);
305 device
->debug_area
= NULL
;
307 device
->state
= DASD_STATE_KNOWN
;
312 * Do the initial analysis. The do_analysis function may return
313 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
314 * until the discipline decides to continue the startup sequence
315 * by calling the function dasd_change_state. The eckd disciplines
316 * uses this to start a ccw that detects the format. The completion
317 * interrupt for this detection ccw uses the kernel event daemon to
318 * trigger the call to dasd_change_state. All this is done in the
319 * discipline code, see dasd_eckd.c.
320 * After the analysis ccw is done (do_analysis returned 0) the block
322 * In case the analysis returns an error, the device setup is stopped
323 * (a fake disk was already added to allow formatting).
325 static int dasd_state_basic_to_ready(struct dasd_device
*device
)
328 struct dasd_block
*block
;
329 struct gendisk
*disk
;
332 block
= device
->block
;
333 /* make disk known with correct capacity */
335 if (block
->base
->discipline
->do_analysis
!= NULL
)
336 rc
= block
->base
->discipline
->do_analysis(block
);
339 device
->state
= DASD_STATE_UNFMT
;
340 disk
= device
->block
->gdp
;
341 kobject_uevent(&disk_to_dev(disk
)->kobj
,
347 dasd_setup_queue(block
);
348 set_capacity(block
->gdp
,
349 block
->blocks
<< block
->s2b_shift
);
350 device
->state
= DASD_STATE_READY
;
351 rc
= dasd_scan_partitions(block
);
353 device
->state
= DASD_STATE_BASIC
;
357 device
->state
= DASD_STATE_READY
;
360 if (device
->discipline
->basic_to_ready
)
361 rc
= device
->discipline
->basic_to_ready(device
);
366 int _wait_for_empty_queues(struct dasd_device
*device
)
369 return list_empty(&device
->ccw_queue
) &&
370 list_empty(&device
->block
->ccw_queue
);
372 return list_empty(&device
->ccw_queue
);
376 * Remove device from block device layer. Destroy dirty buffers.
377 * Forget format information. Check if the target level is basic
378 * and if it is create fake disk for formatting.
380 static int dasd_state_ready_to_basic(struct dasd_device
*device
)
384 device
->state
= DASD_STATE_BASIC
;
386 struct dasd_block
*block
= device
->block
;
387 rc
= dasd_flush_block_queue(block
);
389 device
->state
= DASD_STATE_READY
;
392 dasd_destroy_partitions(block
);
395 block
->s2b_shift
= 0;
403 static int dasd_state_unfmt_to_basic(struct dasd_device
*device
)
405 device
->state
= DASD_STATE_BASIC
;
410 * Make the device online and schedule the bottom half to start
411 * the requeueing of requests from the linux request queue to the
415 dasd_state_ready_to_online(struct dasd_device
* device
)
417 struct gendisk
*disk
;
418 struct disk_part_iter piter
;
419 struct hd_struct
*part
;
421 device
->state
= DASD_STATE_ONLINE
;
423 dasd_schedule_block_bh(device
->block
);
424 if ((device
->features
& DASD_FEATURE_USERAW
)) {
425 disk
= device
->block
->gdp
;
426 kobject_uevent(&disk_to_dev(disk
)->kobj
, KOBJ_CHANGE
);
429 disk
= device
->block
->bdev
->bd_disk
;
430 disk_part_iter_init(&piter
, disk
, DISK_PITER_INCL_PART0
);
431 while ((part
= disk_part_iter_next(&piter
)))
432 kobject_uevent(&part_to_dev(part
)->kobj
, KOBJ_CHANGE
);
433 disk_part_iter_exit(&piter
);
439 * Stop the requeueing of requests again.
441 static int dasd_state_online_to_ready(struct dasd_device
*device
)
444 struct gendisk
*disk
;
445 struct disk_part_iter piter
;
446 struct hd_struct
*part
;
448 if (device
->discipline
->online_to_ready
) {
449 rc
= device
->discipline
->online_to_ready(device
);
454 device
->state
= DASD_STATE_READY
;
455 if (device
->block
&& !(device
->features
& DASD_FEATURE_USERAW
)) {
456 disk
= device
->block
->bdev
->bd_disk
;
457 disk_part_iter_init(&piter
, disk
, DISK_PITER_INCL_PART0
);
458 while ((part
= disk_part_iter_next(&piter
)))
459 kobject_uevent(&part_to_dev(part
)->kobj
, KOBJ_CHANGE
);
460 disk_part_iter_exit(&piter
);
466 * Device startup state changes.
468 static int dasd_increase_state(struct dasd_device
*device
)
473 if (device
->state
== DASD_STATE_NEW
&&
474 device
->target
>= DASD_STATE_KNOWN
)
475 rc
= dasd_state_new_to_known(device
);
478 device
->state
== DASD_STATE_KNOWN
&&
479 device
->target
>= DASD_STATE_BASIC
)
480 rc
= dasd_state_known_to_basic(device
);
483 device
->state
== DASD_STATE_BASIC
&&
484 device
->target
>= DASD_STATE_READY
)
485 rc
= dasd_state_basic_to_ready(device
);
488 device
->state
== DASD_STATE_UNFMT
&&
489 device
->target
> DASD_STATE_UNFMT
)
493 device
->state
== DASD_STATE_READY
&&
494 device
->target
>= DASD_STATE_ONLINE
)
495 rc
= dasd_state_ready_to_online(device
);
501 * Device shutdown state changes.
503 static int dasd_decrease_state(struct dasd_device
*device
)
508 if (device
->state
== DASD_STATE_ONLINE
&&
509 device
->target
<= DASD_STATE_READY
)
510 rc
= dasd_state_online_to_ready(device
);
513 device
->state
== DASD_STATE_READY
&&
514 device
->target
<= DASD_STATE_BASIC
)
515 rc
= dasd_state_ready_to_basic(device
);
518 device
->state
== DASD_STATE_UNFMT
&&
519 device
->target
<= DASD_STATE_BASIC
)
520 rc
= dasd_state_unfmt_to_basic(device
);
523 device
->state
== DASD_STATE_BASIC
&&
524 device
->target
<= DASD_STATE_KNOWN
)
525 rc
= dasd_state_basic_to_known(device
);
528 device
->state
== DASD_STATE_KNOWN
&&
529 device
->target
<= DASD_STATE_NEW
)
530 rc
= dasd_state_known_to_new(device
);
536 * This is the main startup/shutdown routine.
538 static void dasd_change_state(struct dasd_device
*device
)
542 if (device
->state
== device
->target
)
543 /* Already where we want to go today... */
545 if (device
->state
< device
->target
)
546 rc
= dasd_increase_state(device
);
548 rc
= dasd_decrease_state(device
);
552 device
->target
= device
->state
;
554 /* let user-space know that the device status changed */
555 kobject_uevent(&device
->cdev
->dev
.kobj
, KOBJ_CHANGE
);
557 if (device
->state
== device
->target
)
558 wake_up(&dasd_init_waitq
);
562 * Kick starter for devices that did not complete the startup/shutdown
563 * procedure or were sleeping because of a pending state.
564 * dasd_kick_device will schedule a call do do_kick_device to the kernel
567 static void do_kick_device(struct work_struct
*work
)
569 struct dasd_device
*device
= container_of(work
, struct dasd_device
, kick_work
);
570 mutex_lock(&device
->state_mutex
);
571 dasd_change_state(device
);
572 mutex_unlock(&device
->state_mutex
);
573 dasd_schedule_device_bh(device
);
574 dasd_put_device(device
);
577 void dasd_kick_device(struct dasd_device
*device
)
579 dasd_get_device(device
);
580 /* queue call to dasd_kick_device to the kernel event daemon. */
581 if (!schedule_work(&device
->kick_work
))
582 dasd_put_device(device
);
584 EXPORT_SYMBOL(dasd_kick_device
);
587 * dasd_reload_device will schedule a call do do_reload_device to the kernel
590 static void do_reload_device(struct work_struct
*work
)
592 struct dasd_device
*device
= container_of(work
, struct dasd_device
,
594 device
->discipline
->reload(device
);
595 dasd_put_device(device
);
598 void dasd_reload_device(struct dasd_device
*device
)
600 dasd_get_device(device
);
601 /* queue call to dasd_reload_device to the kernel event daemon. */
602 if (!schedule_work(&device
->reload_device
))
603 dasd_put_device(device
);
605 EXPORT_SYMBOL(dasd_reload_device
);
608 * dasd_restore_device will schedule a call do do_restore_device to the kernel
611 static void do_restore_device(struct work_struct
*work
)
613 struct dasd_device
*device
= container_of(work
, struct dasd_device
,
615 device
->cdev
->drv
->restore(device
->cdev
);
616 dasd_put_device(device
);
619 void dasd_restore_device(struct dasd_device
*device
)
621 dasd_get_device(device
);
622 /* queue call to dasd_restore_device to the kernel event daemon. */
623 if (!schedule_work(&device
->restore_device
))
624 dasd_put_device(device
);
628 * Set the target state for a device and starts the state change.
630 void dasd_set_target_state(struct dasd_device
*device
, int target
)
632 dasd_get_device(device
);
633 mutex_lock(&device
->state_mutex
);
634 /* If we are in probeonly mode stop at DASD_STATE_READY. */
635 if (dasd_probeonly
&& target
> DASD_STATE_READY
)
636 target
= DASD_STATE_READY
;
637 if (device
->target
!= target
) {
638 if (device
->state
== target
)
639 wake_up(&dasd_init_waitq
);
640 device
->target
= target
;
642 if (device
->state
!= device
->target
)
643 dasd_change_state(device
);
644 mutex_unlock(&device
->state_mutex
);
645 dasd_put_device(device
);
647 EXPORT_SYMBOL(dasd_set_target_state
);
650 * Enable devices with device numbers in [from..to].
652 static inline int _wait_for_device(struct dasd_device
*device
)
654 return (device
->state
== device
->target
);
657 void dasd_enable_device(struct dasd_device
*device
)
659 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
660 if (device
->state
<= DASD_STATE_KNOWN
)
661 /* No discipline for device found. */
662 dasd_set_target_state(device
, DASD_STATE_NEW
);
663 /* Now wait for the devices to come up. */
664 wait_event(dasd_init_waitq
, _wait_for_device(device
));
666 dasd_reload_device(device
);
667 if (device
->discipline
->kick_validate
)
668 device
->discipline
->kick_validate(device
);
670 EXPORT_SYMBOL(dasd_enable_device
);
673 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
676 unsigned int dasd_global_profile_level
= DASD_PROFILE_OFF
;
678 #ifdef CONFIG_DASD_PROFILE
679 struct dasd_profile dasd_global_profile
= {
680 .lock
= __SPIN_LOCK_UNLOCKED(dasd_global_profile
.lock
),
682 static struct dentry
*dasd_debugfs_global_entry
;
685 * Add profiling information for cqr before execution.
687 static void dasd_profile_start(struct dasd_block
*block
,
688 struct dasd_ccw_req
*cqr
,
692 unsigned int counter
;
693 struct dasd_device
*device
;
695 /* count the length of the chanq for statistics */
697 if (dasd_global_profile_level
|| block
->profile
.data
)
698 list_for_each(l
, &block
->ccw_queue
)
702 spin_lock(&dasd_global_profile
.lock
);
703 if (dasd_global_profile
.data
) {
704 dasd_global_profile
.data
->dasd_io_nr_req
[counter
]++;
705 if (rq_data_dir(req
) == READ
)
706 dasd_global_profile
.data
->dasd_read_nr_req
[counter
]++;
708 spin_unlock(&dasd_global_profile
.lock
);
710 spin_lock(&block
->profile
.lock
);
711 if (block
->profile
.data
) {
712 block
->profile
.data
->dasd_io_nr_req
[counter
]++;
713 if (rq_data_dir(req
) == READ
)
714 block
->profile
.data
->dasd_read_nr_req
[counter
]++;
716 spin_unlock(&block
->profile
.lock
);
719 * We count the request for the start device, even though it may run on
720 * some other device due to error recovery. This way we make sure that
721 * we count each request only once.
723 device
= cqr
->startdev
;
724 if (device
->profile
.data
) {
725 counter
= 1; /* request is not yet queued on the start device */
726 list_for_each(l
, &device
->ccw_queue
)
730 spin_lock(&device
->profile
.lock
);
731 if (device
->profile
.data
) {
732 device
->profile
.data
->dasd_io_nr_req
[counter
]++;
733 if (rq_data_dir(req
) == READ
)
734 device
->profile
.data
->dasd_read_nr_req
[counter
]++;
736 spin_unlock(&device
->profile
.lock
);
740 * Add profiling information for cqr after execution.
743 #define dasd_profile_counter(value, index) \
745 for (index = 0; index < 31 && value >> (2+index); index++) \
749 static void dasd_profile_end_add_data(struct dasd_profile_info
*data
,
762 /* in case of an overflow, reset the whole profile */
763 if (data
->dasd_io_reqs
== UINT_MAX
) {
764 memset(data
, 0, sizeof(*data
));
765 getnstimeofday(&data
->starttod
);
767 data
->dasd_io_reqs
++;
768 data
->dasd_io_sects
+= sectors
;
770 data
->dasd_io_alias
++;
774 data
->dasd_io_secs
[sectors_ind
]++;
775 data
->dasd_io_times
[tottime_ind
]++;
776 data
->dasd_io_timps
[tottimeps_ind
]++;
777 data
->dasd_io_time1
[strtime_ind
]++;
778 data
->dasd_io_time2
[irqtime_ind
]++;
779 data
->dasd_io_time2ps
[irqtimeps_ind
]++;
780 data
->dasd_io_time3
[endtime_ind
]++;
783 data
->dasd_read_reqs
++;
784 data
->dasd_read_sects
+= sectors
;
786 data
->dasd_read_alias
++;
788 data
->dasd_read_tpm
++;
789 data
->dasd_read_secs
[sectors_ind
]++;
790 data
->dasd_read_times
[tottime_ind
]++;
791 data
->dasd_read_time1
[strtime_ind
]++;
792 data
->dasd_read_time2
[irqtime_ind
]++;
793 data
->dasd_read_time3
[endtime_ind
]++;
797 static void dasd_profile_end(struct dasd_block
*block
,
798 struct dasd_ccw_req
*cqr
,
801 unsigned long strtime
, irqtime
, endtime
, tottime
;
802 unsigned long tottimeps
, sectors
;
803 struct dasd_device
*device
;
804 int sectors_ind
, tottime_ind
, tottimeps_ind
, strtime_ind
;
805 int irqtime_ind
, irqtimeps_ind
, endtime_ind
;
806 struct dasd_profile_info
*data
;
808 device
= cqr
->startdev
;
809 if (!(dasd_global_profile_level
||
810 block
->profile
.data
||
811 device
->profile
.data
))
814 sectors
= blk_rq_sectors(req
);
815 if (!cqr
->buildclk
|| !cqr
->startclk
||
816 !cqr
->stopclk
|| !cqr
->endclk
||
820 strtime
= ((cqr
->startclk
- cqr
->buildclk
) >> 12);
821 irqtime
= ((cqr
->stopclk
- cqr
->startclk
) >> 12);
822 endtime
= ((cqr
->endclk
- cqr
->stopclk
) >> 12);
823 tottime
= ((cqr
->endclk
- cqr
->buildclk
) >> 12);
824 tottimeps
= tottime
/ sectors
;
826 dasd_profile_counter(sectors
, sectors_ind
);
827 dasd_profile_counter(tottime
, tottime_ind
);
828 dasd_profile_counter(tottimeps
, tottimeps_ind
);
829 dasd_profile_counter(strtime
, strtime_ind
);
830 dasd_profile_counter(irqtime
, irqtime_ind
);
831 dasd_profile_counter(irqtime
/ sectors
, irqtimeps_ind
);
832 dasd_profile_counter(endtime
, endtime_ind
);
834 spin_lock(&dasd_global_profile
.lock
);
835 if (dasd_global_profile
.data
) {
836 data
= dasd_global_profile
.data
;
837 data
->dasd_sum_times
+= tottime
;
838 data
->dasd_sum_time_str
+= strtime
;
839 data
->dasd_sum_time_irq
+= irqtime
;
840 data
->dasd_sum_time_end
+= endtime
;
841 dasd_profile_end_add_data(dasd_global_profile
.data
,
842 cqr
->startdev
!= block
->base
,
844 rq_data_dir(req
) == READ
,
845 sectors
, sectors_ind
, tottime_ind
,
846 tottimeps_ind
, strtime_ind
,
847 irqtime_ind
, irqtimeps_ind
,
850 spin_unlock(&dasd_global_profile
.lock
);
852 spin_lock(&block
->profile
.lock
);
853 if (block
->profile
.data
) {
854 data
= block
->profile
.data
;
855 data
->dasd_sum_times
+= tottime
;
856 data
->dasd_sum_time_str
+= strtime
;
857 data
->dasd_sum_time_irq
+= irqtime
;
858 data
->dasd_sum_time_end
+= endtime
;
859 dasd_profile_end_add_data(block
->profile
.data
,
860 cqr
->startdev
!= block
->base
,
862 rq_data_dir(req
) == READ
,
863 sectors
, sectors_ind
, tottime_ind
,
864 tottimeps_ind
, strtime_ind
,
865 irqtime_ind
, irqtimeps_ind
,
868 spin_unlock(&block
->profile
.lock
);
870 spin_lock(&device
->profile
.lock
);
871 if (device
->profile
.data
) {
872 data
= device
->profile
.data
;
873 data
->dasd_sum_times
+= tottime
;
874 data
->dasd_sum_time_str
+= strtime
;
875 data
->dasd_sum_time_irq
+= irqtime
;
876 data
->dasd_sum_time_end
+= endtime
;
877 dasd_profile_end_add_data(device
->profile
.data
,
878 cqr
->startdev
!= block
->base
,
880 rq_data_dir(req
) == READ
,
881 sectors
, sectors_ind
, tottime_ind
,
882 tottimeps_ind
, strtime_ind
,
883 irqtime_ind
, irqtimeps_ind
,
886 spin_unlock(&device
->profile
.lock
);
889 void dasd_profile_reset(struct dasd_profile
*profile
)
891 struct dasd_profile_info
*data
;
893 spin_lock_bh(&profile
->lock
);
894 data
= profile
->data
;
896 spin_unlock_bh(&profile
->lock
);
899 memset(data
, 0, sizeof(*data
));
900 getnstimeofday(&data
->starttod
);
901 spin_unlock_bh(&profile
->lock
);
904 int dasd_profile_on(struct dasd_profile
*profile
)
906 struct dasd_profile_info
*data
;
908 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
911 spin_lock_bh(&profile
->lock
);
913 spin_unlock_bh(&profile
->lock
);
917 getnstimeofday(&data
->starttod
);
918 profile
->data
= data
;
919 spin_unlock_bh(&profile
->lock
);
923 void dasd_profile_off(struct dasd_profile
*profile
)
925 spin_lock_bh(&profile
->lock
);
926 kfree(profile
->data
);
927 profile
->data
= NULL
;
928 spin_unlock_bh(&profile
->lock
);
931 char *dasd_get_user_string(const char __user
*user_buf
, size_t user_len
)
935 buffer
= vmalloc(user_len
+ 1);
937 return ERR_PTR(-ENOMEM
);
938 if (copy_from_user(buffer
, user_buf
, user_len
) != 0) {
940 return ERR_PTR(-EFAULT
);
942 /* got the string, now strip linefeed. */
943 if (buffer
[user_len
- 1] == '\n')
944 buffer
[user_len
- 1] = 0;
946 buffer
[user_len
] = 0;
950 static ssize_t
dasd_stats_write(struct file
*file
,
951 const char __user
*user_buf
,
952 size_t user_len
, loff_t
*pos
)
956 struct seq_file
*m
= (struct seq_file
*)file
->private_data
;
957 struct dasd_profile
*prof
= m
->private;
959 if (user_len
> 65536)
961 buffer
= dasd_get_user_string(user_buf
, user_len
);
963 return PTR_ERR(buffer
);
965 str
= skip_spaces(buffer
);
967 if (strncmp(str
, "reset", 5) == 0) {
968 dasd_profile_reset(prof
);
969 } else if (strncmp(str
, "on", 2) == 0) {
970 rc
= dasd_profile_on(prof
);
974 if (prof
== &dasd_global_profile
) {
975 dasd_profile_reset(prof
);
976 dasd_global_profile_level
= DASD_PROFILE_GLOBAL_ONLY
;
978 } else if (strncmp(str
, "off", 3) == 0) {
979 if (prof
== &dasd_global_profile
)
980 dasd_global_profile_level
= DASD_PROFILE_OFF
;
981 dasd_profile_off(prof
);
989 static void dasd_stats_array(struct seq_file
*m
, unsigned int *array
)
993 for (i
= 0; i
< 32; i
++)
994 seq_printf(m
, "%u ", array
[i
]);
998 static void dasd_stats_seq_print(struct seq_file
*m
,
999 struct dasd_profile_info
*data
)
1001 seq_printf(m
, "start_time %ld.%09ld\n",
1002 data
->starttod
.tv_sec
, data
->starttod
.tv_nsec
);
1003 seq_printf(m
, "total_requests %u\n", data
->dasd_io_reqs
);
1004 seq_printf(m
, "total_sectors %u\n", data
->dasd_io_sects
);
1005 seq_printf(m
, "total_pav %u\n", data
->dasd_io_alias
);
1006 seq_printf(m
, "total_hpf %u\n", data
->dasd_io_tpm
);
1007 seq_printf(m
, "avg_total %lu\n", data
->dasd_io_reqs
?
1008 data
->dasd_sum_times
/ data
->dasd_io_reqs
: 0UL);
1009 seq_printf(m
, "avg_build_to_ssch %lu\n", data
->dasd_io_reqs
?
1010 data
->dasd_sum_time_str
/ data
->dasd_io_reqs
: 0UL);
1011 seq_printf(m
, "avg_ssch_to_irq %lu\n", data
->dasd_io_reqs
?
1012 data
->dasd_sum_time_irq
/ data
->dasd_io_reqs
: 0UL);
1013 seq_printf(m
, "avg_irq_to_end %lu\n", data
->dasd_io_reqs
?
1014 data
->dasd_sum_time_end
/ data
->dasd_io_reqs
: 0UL);
1015 seq_puts(m
, "histogram_sectors ");
1016 dasd_stats_array(m
, data
->dasd_io_secs
);
1017 seq_puts(m
, "histogram_io_times ");
1018 dasd_stats_array(m
, data
->dasd_io_times
);
1019 seq_puts(m
, "histogram_io_times_weighted ");
1020 dasd_stats_array(m
, data
->dasd_io_timps
);
1021 seq_puts(m
, "histogram_time_build_to_ssch ");
1022 dasd_stats_array(m
, data
->dasd_io_time1
);
1023 seq_puts(m
, "histogram_time_ssch_to_irq ");
1024 dasd_stats_array(m
, data
->dasd_io_time2
);
1025 seq_puts(m
, "histogram_time_ssch_to_irq_weighted ");
1026 dasd_stats_array(m
, data
->dasd_io_time2ps
);
1027 seq_puts(m
, "histogram_time_irq_to_end ");
1028 dasd_stats_array(m
, data
->dasd_io_time3
);
1029 seq_puts(m
, "histogram_ccw_queue_length ");
1030 dasd_stats_array(m
, data
->dasd_io_nr_req
);
1031 seq_printf(m
, "total_read_requests %u\n", data
->dasd_read_reqs
);
1032 seq_printf(m
, "total_read_sectors %u\n", data
->dasd_read_sects
);
1033 seq_printf(m
, "total_read_pav %u\n", data
->dasd_read_alias
);
1034 seq_printf(m
, "total_read_hpf %u\n", data
->dasd_read_tpm
);
1035 seq_puts(m
, "histogram_read_sectors ");
1036 dasd_stats_array(m
, data
->dasd_read_secs
);
1037 seq_puts(m
, "histogram_read_times ");
1038 dasd_stats_array(m
, data
->dasd_read_times
);
1039 seq_puts(m
, "histogram_read_time_build_to_ssch ");
1040 dasd_stats_array(m
, data
->dasd_read_time1
);
1041 seq_puts(m
, "histogram_read_time_ssch_to_irq ");
1042 dasd_stats_array(m
, data
->dasd_read_time2
);
1043 seq_puts(m
, "histogram_read_time_irq_to_end ");
1044 dasd_stats_array(m
, data
->dasd_read_time3
);
1045 seq_puts(m
, "histogram_read_ccw_queue_length ");
1046 dasd_stats_array(m
, data
->dasd_read_nr_req
);
1049 static int dasd_stats_show(struct seq_file
*m
, void *v
)
1051 struct dasd_profile
*profile
;
1052 struct dasd_profile_info
*data
;
1054 profile
= m
->private;
1055 spin_lock_bh(&profile
->lock
);
1056 data
= profile
->data
;
1058 spin_unlock_bh(&profile
->lock
);
1059 seq_puts(m
, "disabled\n");
1062 dasd_stats_seq_print(m
, data
);
1063 spin_unlock_bh(&profile
->lock
);
1067 static int dasd_stats_open(struct inode
*inode
, struct file
*file
)
1069 struct dasd_profile
*profile
= inode
->i_private
;
1070 return single_open(file
, dasd_stats_show
, profile
);
1073 static const struct file_operations dasd_stats_raw_fops
= {
1074 .owner
= THIS_MODULE
,
1075 .open
= dasd_stats_open
,
1077 .llseek
= seq_lseek
,
1078 .release
= single_release
,
1079 .write
= dasd_stats_write
,
1082 static void dasd_profile_init(struct dasd_profile
*profile
,
1083 struct dentry
*base_dentry
)
1090 profile
->dentry
= NULL
;
1091 profile
->data
= NULL
;
1092 mode
= (S_IRUSR
| S_IWUSR
| S_IFREG
);
1093 pde
= debugfs_create_file("statistics", mode
, base_dentry
,
1094 profile
, &dasd_stats_raw_fops
);
1095 if (pde
&& !IS_ERR(pde
))
1096 profile
->dentry
= pde
;
1100 static void dasd_profile_exit(struct dasd_profile
*profile
)
1102 dasd_profile_off(profile
);
1103 debugfs_remove(profile
->dentry
);
1104 profile
->dentry
= NULL
;
1107 static void dasd_statistics_removeroot(void)
1109 dasd_global_profile_level
= DASD_PROFILE_OFF
;
1110 dasd_profile_exit(&dasd_global_profile
);
1111 debugfs_remove(dasd_debugfs_global_entry
);
1112 debugfs_remove(dasd_debugfs_root_entry
);
1115 static void dasd_statistics_createroot(void)
1119 dasd_debugfs_root_entry
= NULL
;
1120 pde
= debugfs_create_dir("dasd", NULL
);
1121 if (!pde
|| IS_ERR(pde
))
1123 dasd_debugfs_root_entry
= pde
;
1124 pde
= debugfs_create_dir("global", dasd_debugfs_root_entry
);
1125 if (!pde
|| IS_ERR(pde
))
1127 dasd_debugfs_global_entry
= pde
;
1128 dasd_profile_init(&dasd_global_profile
, dasd_debugfs_global_entry
);
1132 DBF_EVENT(DBF_ERR
, "%s",
1133 "Creation of the dasd debugfs interface failed");
1134 dasd_statistics_removeroot();
1139 #define dasd_profile_start(block, cqr, req) do {} while (0)
1140 #define dasd_profile_end(block, cqr, req) do {} while (0)
1142 static void dasd_statistics_createroot(void)
1147 static void dasd_statistics_removeroot(void)
1152 int dasd_stats_generic_show(struct seq_file
*m
, void *v
)
1154 seq_puts(m
, "Statistics are not activated in this kernel\n");
1158 static void dasd_profile_init(struct dasd_profile
*profile
,
1159 struct dentry
*base_dentry
)
1164 static void dasd_profile_exit(struct dasd_profile
*profile
)
1169 int dasd_profile_on(struct dasd_profile
*profile
)
1174 #endif /* CONFIG_DASD_PROFILE */
1176 static int dasd_hosts_show(struct seq_file
*m
, void *v
)
1178 struct dasd_device
*device
;
1179 int rc
= -EOPNOTSUPP
;
1181 device
= m
->private;
1182 dasd_get_device(device
);
1184 if (device
->discipline
->hosts_print
)
1185 rc
= device
->discipline
->hosts_print(device
, m
);
1187 dasd_put_device(device
);
1191 static int dasd_hosts_open(struct inode
*inode
, struct file
*file
)
1193 struct dasd_device
*device
= inode
->i_private
;
1195 return single_open(file
, dasd_hosts_show
, device
);
1198 static const struct file_operations dasd_hosts_fops
= {
1199 .owner
= THIS_MODULE
,
1200 .open
= dasd_hosts_open
,
1202 .llseek
= seq_lseek
,
1203 .release
= single_release
,
1206 static void dasd_hosts_exit(struct dasd_device
*device
)
1208 debugfs_remove(device
->hosts_dentry
);
1209 device
->hosts_dentry
= NULL
;
1212 static void dasd_hosts_init(struct dentry
*base_dentry
,
1213 struct dasd_device
*device
)
1221 mode
= S_IRUSR
| S_IFREG
;
1222 pde
= debugfs_create_file("host_access_list", mode
, base_dentry
,
1223 device
, &dasd_hosts_fops
);
1224 if (pde
&& !IS_ERR(pde
))
1225 device
->hosts_dentry
= pde
;
1229 * Allocate memory for a channel program with 'cplength' channel
1230 * command words and 'datasize' additional space. There are two
1231 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
1232 * memory and 2) dasd_smalloc_request uses the static ccw memory
1233 * that gets allocated for each device.
1235 struct dasd_ccw_req
*dasd_kmalloc_request(int magic
, int cplength
,
1237 struct dasd_device
*device
)
1239 struct dasd_ccw_req
*cqr
;
1242 BUG_ON(datasize
> PAGE_SIZE
||
1243 (cplength
*sizeof(struct ccw1
)) > PAGE_SIZE
);
1245 cqr
= kzalloc(sizeof(struct dasd_ccw_req
), GFP_ATOMIC
);
1247 return ERR_PTR(-ENOMEM
);
1250 cqr
->cpaddr
= kcalloc(cplength
, sizeof(struct ccw1
),
1251 GFP_ATOMIC
| GFP_DMA
);
1252 if (cqr
->cpaddr
== NULL
) {
1254 return ERR_PTR(-ENOMEM
);
1259 cqr
->data
= kzalloc(datasize
, GFP_ATOMIC
| GFP_DMA
);
1260 if (cqr
->data
== NULL
) {
1263 return ERR_PTR(-ENOMEM
);
1267 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
1268 dasd_get_device(device
);
1271 EXPORT_SYMBOL(dasd_kmalloc_request
);
1273 struct dasd_ccw_req
*dasd_smalloc_request(int magic
, int cplength
,
1275 struct dasd_device
*device
)
1277 unsigned long flags
;
1278 struct dasd_ccw_req
*cqr
;
1282 size
= (sizeof(struct dasd_ccw_req
) + 7L) & -8L;
1284 size
+= cplength
* sizeof(struct ccw1
);
1287 spin_lock_irqsave(&device
->mem_lock
, flags
);
1288 cqr
= (struct dasd_ccw_req
*)
1289 dasd_alloc_chunk(&device
->ccw_chunks
, size
);
1290 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
1292 return ERR_PTR(-ENOMEM
);
1293 memset(cqr
, 0, sizeof(struct dasd_ccw_req
));
1294 data
= (char *) cqr
+ ((sizeof(struct dasd_ccw_req
) + 7L) & -8L);
1297 cqr
->cpaddr
= (struct ccw1
*) data
;
1298 data
+= cplength
*sizeof(struct ccw1
);
1299 memset(cqr
->cpaddr
, 0, cplength
*sizeof(struct ccw1
));
1304 memset(cqr
->data
, 0, datasize
);
1307 set_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
);
1308 dasd_get_device(device
);
1311 EXPORT_SYMBOL(dasd_smalloc_request
);
1314 * Free memory of a channel program. This function needs to free all the
1315 * idal lists that might have been created by dasd_set_cda and the
1316 * struct dasd_ccw_req itself.
1318 void dasd_kfree_request(struct dasd_ccw_req
*cqr
, struct dasd_device
*device
)
1322 /* Clear any idals used for the request. */
1325 clear_normalized_cda(ccw
);
1326 } while (ccw
++->flags
& (CCW_FLAG_CC
| CCW_FLAG_DC
));
1330 dasd_put_device(device
);
1332 EXPORT_SYMBOL(dasd_kfree_request
);
1334 void dasd_sfree_request(struct dasd_ccw_req
*cqr
, struct dasd_device
*device
)
1336 unsigned long flags
;
1338 spin_lock_irqsave(&device
->mem_lock
, flags
);
1339 dasd_free_chunk(&device
->ccw_chunks
, cqr
);
1340 spin_unlock_irqrestore(&device
->mem_lock
, flags
);
1341 dasd_put_device(device
);
1343 EXPORT_SYMBOL(dasd_sfree_request
);
1346 * Check discipline magic in cqr.
1348 static inline int dasd_check_cqr(struct dasd_ccw_req
*cqr
)
1350 struct dasd_device
*device
;
1354 device
= cqr
->startdev
;
1355 if (strncmp((char *) &cqr
->magic
, device
->discipline
->ebcname
, 4)) {
1356 DBF_DEV_EVENT(DBF_WARNING
, device
,
1357 " dasd_ccw_req 0x%08x magic doesn't match"
1358 " discipline 0x%08x",
1360 *(unsigned int *) device
->discipline
->name
);
1367 * Terminate the current i/o and set the request to clear_pending.
1368 * Timer keeps device runnig.
1369 * ccw_device_clear can fail if the i/o subsystem
1372 int dasd_term_IO(struct dasd_ccw_req
*cqr
)
1374 struct dasd_device
*device
;
1376 char errorstring
[ERRORLENGTH
];
1379 rc
= dasd_check_cqr(cqr
);
1383 device
= (struct dasd_device
*) cqr
->startdev
;
1384 while ((retries
< 5) && (cqr
->status
== DASD_CQR_IN_IO
)) {
1385 rc
= ccw_device_clear(device
->cdev
, (long) cqr
);
1387 case 0: /* termination successful */
1388 cqr
->status
= DASD_CQR_CLEAR_PENDING
;
1389 cqr
->stopclk
= get_tod_clock();
1391 DBF_DEV_EVENT(DBF_DEBUG
, device
,
1392 "terminate cqr %p successful",
1396 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
1397 "device gone, retry");
1400 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
1401 "I/O error, retry");
1405 * device not valid so no I/O could be running
1406 * handle CQR as termination successful
1408 cqr
->status
= DASD_CQR_CLEARED
;
1409 cqr
->stopclk
= get_tod_clock();
1411 /* no retries for invalid devices */
1413 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
1414 "EINVAL, handle as terminated");
1415 /* fake rc to success */
1419 DBF_DEV_EVENT(DBF_ERR
, device
, "%s",
1420 "device busy, retry later");
1423 /* internal error 10 - unknown rc*/
1424 snprintf(errorstring
, ERRORLENGTH
, "10 %d", rc
);
1425 dev_err(&device
->cdev
->dev
, "An error occurred in the "
1426 "DASD device driver, reason=%s\n", errorstring
);
1432 dasd_schedule_device_bh(device
);
1435 EXPORT_SYMBOL(dasd_term_IO
);
1438 * Start the i/o. This start_IO can fail if the channel is really busy.
1439 * In that case set up a timer to start the request later.
1441 int dasd_start_IO(struct dasd_ccw_req
*cqr
)
1443 struct dasd_device
*device
;
1445 char errorstring
[ERRORLENGTH
];
1448 rc
= dasd_check_cqr(cqr
);
1453 device
= (struct dasd_device
*) cqr
->startdev
;
1455 test_bit(DASD_FLAG_LOCK_STOLEN
, &cqr
->block
->base
->flags
)) ||
1456 test_bit(DASD_FLAG_LOCK_STOLEN
, &device
->flags
)) &&
1457 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
1458 DBF_DEV_EVENT(DBF_DEBUG
, device
, "start_IO: return request %p "
1459 "because of stolen lock", cqr
);
1460 cqr
->status
= DASD_CQR_ERROR
;
1461 cqr
->intrc
= -EPERM
;
1464 if (cqr
->retries
< 0) {
1465 /* internal error 14 - start_IO run out of retries */
1466 sprintf(errorstring
, "14 %p", cqr
);
1467 dev_err(&device
->cdev
->dev
, "An error occurred in the DASD "
1468 "device driver, reason=%s\n", errorstring
);
1469 cqr
->status
= DASD_CQR_ERROR
;
1472 cqr
->startclk
= get_tod_clock();
1473 cqr
->starttime
= jiffies
;
1475 if (!test_bit(DASD_CQR_VERIFY_PATH
, &cqr
->flags
)) {
1476 cqr
->lpm
&= dasd_path_get_opm(device
);
1478 cqr
->lpm
= dasd_path_get_opm(device
);
1480 if (cqr
->cpmode
== 1) {
1481 rc
= ccw_device_tm_start(device
->cdev
, cqr
->cpaddr
,
1482 (long) cqr
, cqr
->lpm
);
1484 rc
= ccw_device_start(device
->cdev
, cqr
->cpaddr
,
1485 (long) cqr
, cqr
->lpm
, 0);
1489 cqr
->status
= DASD_CQR_IN_IO
;
1492 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1493 "start_IO: device busy, retry later");
1496 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1497 "start_IO: request timeout, retry later");
1500 /* -EACCES indicates that the request used only a subset of the
1501 * available paths and all these paths are gone. If the lpm of
1502 * this request was only a subset of the opm (e.g. the ppm) then
1503 * we just do a retry with all available paths.
1504 * If we already use the full opm, something is amiss, and we
1505 * need a full path verification.
1507 if (test_bit(DASD_CQR_VERIFY_PATH
, &cqr
->flags
)) {
1508 DBF_DEV_EVENT(DBF_WARNING
, device
,
1509 "start_IO: selected paths gone (%x)",
1511 } else if (cqr
->lpm
!= dasd_path_get_opm(device
)) {
1512 cqr
->lpm
= dasd_path_get_opm(device
);
1513 DBF_DEV_EVENT(DBF_DEBUG
, device
, "%s",
1514 "start_IO: selected paths gone,"
1515 " retry on all paths");
1517 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1518 "start_IO: all paths in opm gone,"
1519 " do path verification");
1520 dasd_generic_last_path_gone(device
);
1521 dasd_path_no_path(device
);
1522 dasd_path_set_tbvpm(device
,
1523 ccw_device_get_path_mask(
1528 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1529 "start_IO: -ENODEV device gone, retry");
1532 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1533 "start_IO: -EIO device gone, retry");
1536 /* most likely caused in power management context */
1537 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
1538 "start_IO: -EINVAL device currently "
1542 /* internal error 11 - unknown rc */
1543 snprintf(errorstring
, ERRORLENGTH
, "11 %d", rc
);
1544 dev_err(&device
->cdev
->dev
,
1545 "An error occurred in the DASD device driver, "
1546 "reason=%s\n", errorstring
);
1553 EXPORT_SYMBOL(dasd_start_IO
);
1556 * Timeout function for dasd devices. This is used for different purposes
1557 * 1) missing interrupt handler for normal operation
1558 * 2) delayed start of request where start_IO failed with -EBUSY
1559 * 3) timeout for missing state change interrupts
1560 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
1561 * DASD_CQR_QUEUED for 2) and 3).
1563 static void dasd_device_timeout(unsigned long ptr
)
1565 unsigned long flags
;
1566 struct dasd_device
*device
;
1568 device
= (struct dasd_device
*) ptr
;
1569 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
1570 /* re-activate request queue */
1571 dasd_device_remove_stop_bits(device
, DASD_STOPPED_PENDING
);
1572 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
1573 dasd_schedule_device_bh(device
);
1577 * Setup timeout for a device in jiffies.
1579 void dasd_device_set_timer(struct dasd_device
*device
, int expires
)
1582 del_timer(&device
->timer
);
1584 mod_timer(&device
->timer
, jiffies
+ expires
);
1586 EXPORT_SYMBOL(dasd_device_set_timer
);
1589 * Clear timeout for a device.
1591 void dasd_device_clear_timer(struct dasd_device
*device
)
1593 del_timer(&device
->timer
);
1595 EXPORT_SYMBOL(dasd_device_clear_timer
);
1597 static void dasd_handle_killed_request(struct ccw_device
*cdev
,
1598 unsigned long intparm
)
1600 struct dasd_ccw_req
*cqr
;
1601 struct dasd_device
*device
;
1605 cqr
= (struct dasd_ccw_req
*) intparm
;
1606 if (cqr
->status
!= DASD_CQR_IN_IO
) {
1607 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
,
1608 "invalid status in handle_killed_request: "
1609 "%02x", cqr
->status
);
1613 device
= dasd_device_from_cdev_locked(cdev
);
1614 if (IS_ERR(device
)) {
1615 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
, "%s",
1616 "unable to get device from cdev");
1620 if (!cqr
->startdev
||
1621 device
!= cqr
->startdev
||
1622 strncmp(cqr
->startdev
->discipline
->ebcname
,
1623 (char *) &cqr
->magic
, 4)) {
1624 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
, "%s",
1625 "invalid device in request");
1626 dasd_put_device(device
);
1630 /* Schedule request to be retried. */
1631 cqr
->status
= DASD_CQR_QUEUED
;
1633 dasd_device_clear_timer(device
);
1634 dasd_schedule_device_bh(device
);
1635 dasd_put_device(device
);
1638 void dasd_generic_handle_state_change(struct dasd_device
*device
)
1640 /* First of all start sense subsystem status request. */
1641 dasd_eer_snss(device
);
1643 dasd_device_remove_stop_bits(device
, DASD_STOPPED_PENDING
);
1644 dasd_schedule_device_bh(device
);
1645 if (device
->block
) {
1646 dasd_schedule_block_bh(device
->block
);
1647 blk_mq_run_hw_queues(device
->block
->request_queue
, true);
1650 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change
);
1652 static int dasd_check_hpf_error(struct irb
*irb
)
1654 return (scsw_tm_is_valid_schxs(&irb
->scsw
) &&
1655 (irb
->scsw
.tm
.sesq
== SCSW_SESQ_DEV_NOFCX
||
1656 irb
->scsw
.tm
.sesq
== SCSW_SESQ_PATH_NOFCX
));
1660 * Interrupt handler for "normal" ssch-io based dasd devices.
1662 void dasd_int_handler(struct ccw_device
*cdev
, unsigned long intparm
,
1665 struct dasd_ccw_req
*cqr
, *next
;
1666 struct dasd_device
*device
;
1668 int nrf_suppressed
= 0;
1669 int fp_suppressed
= 0;
1673 cqr
= (struct dasd_ccw_req
*) intparm
;
1675 switch (PTR_ERR(irb
)) {
1677 if (cqr
&& cqr
->status
== DASD_CQR_CLEAR_PENDING
) {
1678 device
= cqr
->startdev
;
1679 cqr
->status
= DASD_CQR_CLEARED
;
1680 dasd_device_clear_timer(device
);
1681 wake_up(&dasd_flush_wq
);
1682 dasd_schedule_device_bh(device
);
1687 DBF_EVENT_DEVID(DBF_WARNING
, cdev
, "%s: "
1688 "request timed out\n", __func__
);
1691 DBF_EVENT_DEVID(DBF_WARNING
, cdev
, "%s: "
1692 "unknown error %ld\n", __func__
,
1695 dasd_handle_killed_request(cdev
, intparm
);
1699 now
= get_tod_clock();
1700 /* check for conditions that should be handled immediately */
1702 !(scsw_dstat(&irb
->scsw
) == (DEV_STAT_CHN_END
| DEV_STAT_DEV_END
) &&
1703 scsw_cstat(&irb
->scsw
) == 0)) {
1705 memcpy(&cqr
->irb
, irb
, sizeof(*irb
));
1706 device
= dasd_device_from_cdev_locked(cdev
);
1709 /* ignore unsolicited interrupts for DIAG discipline */
1710 if (device
->discipline
== dasd_diag_discipline_pointer
) {
1711 dasd_put_device(device
);
1716 * In some cases 'File Protected' or 'No Record Found' errors
1717 * might be expected and debug log messages for the
1718 * corresponding interrupts shouldn't be written then.
1719 * Check if either of the according suppress bits is set.
1721 sense
= dasd_get_sense(irb
);
1723 fp_suppressed
= (sense
[1] & SNS1_FILE_PROTECTED
) &&
1724 test_bit(DASD_CQR_SUPPRESS_FP
, &cqr
->flags
);
1725 nrf_suppressed
= (sense
[1] & SNS1_NO_REC_FOUND
) &&
1726 test_bit(DASD_CQR_SUPPRESS_NRF
, &cqr
->flags
);
1728 if (!(fp_suppressed
|| nrf_suppressed
))
1729 device
->discipline
->dump_sense_dbf(device
, irb
, "int");
1731 if (device
->features
& DASD_FEATURE_ERPLOG
)
1732 device
->discipline
->dump_sense(device
, cqr
, irb
);
1733 device
->discipline
->check_for_device_change(device
, cqr
, irb
);
1734 dasd_put_device(device
);
1737 /* check for for attention message */
1738 if (scsw_dstat(&irb
->scsw
) & DEV_STAT_ATTENTION
) {
1739 device
= dasd_device_from_cdev_locked(cdev
);
1740 if (!IS_ERR(device
)) {
1741 device
->discipline
->check_attention(device
,
1742 irb
->esw
.esw1
.lpum
);
1743 dasd_put_device(device
);
1750 device
= (struct dasd_device
*) cqr
->startdev
;
1752 strncmp(device
->discipline
->ebcname
, (char *) &cqr
->magic
, 4)) {
1753 DBF_EVENT_DEVID(DBF_DEBUG
, cdev
, "%s",
1754 "invalid device in request");
1758 /* Check for clear pending */
1759 if (cqr
->status
== DASD_CQR_CLEAR_PENDING
&&
1760 scsw_fctl(&irb
->scsw
) & SCSW_FCTL_CLEAR_FUNC
) {
1761 cqr
->status
= DASD_CQR_CLEARED
;
1762 dasd_device_clear_timer(device
);
1763 wake_up(&dasd_flush_wq
);
1764 dasd_schedule_device_bh(device
);
1768 /* check status - the request might have been killed by dyn detach */
1769 if (cqr
->status
!= DASD_CQR_IN_IO
) {
1770 DBF_DEV_EVENT(DBF_DEBUG
, device
, "invalid status: bus_id %s, "
1771 "status %02x", dev_name(&cdev
->dev
), cqr
->status
);
1777 if (scsw_dstat(&irb
->scsw
) == (DEV_STAT_CHN_END
| DEV_STAT_DEV_END
) &&
1778 scsw_cstat(&irb
->scsw
) == 0) {
1779 /* request was completed successfully */
1780 cqr
->status
= DASD_CQR_SUCCESS
;
1782 /* Start first request on queue if possible -> fast_io. */
1783 if (cqr
->devlist
.next
!= &device
->ccw_queue
) {
1784 next
= list_entry(cqr
->devlist
.next
,
1785 struct dasd_ccw_req
, devlist
);
1787 } else { /* error */
1788 /* check for HPF error
1789 * call discipline function to requeue all requests
1790 * and disable HPF accordingly
1792 if (cqr
->cpmode
&& dasd_check_hpf_error(irb
) &&
1793 device
->discipline
->handle_hpf_error
)
1794 device
->discipline
->handle_hpf_error(device
, irb
);
1796 * If we don't want complex ERP for this request, then just
1797 * reset this and retry it in the fastpath
1799 if (!test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
) &&
1801 if (cqr
->lpm
== dasd_path_get_opm(device
))
1802 DBF_DEV_EVENT(DBF_DEBUG
, device
,
1803 "default ERP in fastpath "
1804 "(%i retries left)",
1806 if (!test_bit(DASD_CQR_VERIFY_PATH
, &cqr
->flags
))
1807 cqr
->lpm
= dasd_path_get_opm(device
);
1808 cqr
->status
= DASD_CQR_QUEUED
;
1811 cqr
->status
= DASD_CQR_ERROR
;
1813 if (next
&& (next
->status
== DASD_CQR_QUEUED
) &&
1814 (!device
->stopped
)) {
1815 if (device
->discipline
->start_IO(next
) == 0)
1816 expires
= next
->expires
;
1819 dasd_device_set_timer(device
, expires
);
1821 dasd_device_clear_timer(device
);
1822 dasd_schedule_device_bh(device
);
1824 EXPORT_SYMBOL(dasd_int_handler
);
1826 enum uc_todo
dasd_generic_uc_handler(struct ccw_device
*cdev
, struct irb
*irb
)
1828 struct dasd_device
*device
;
1830 device
= dasd_device_from_cdev_locked(cdev
);
1834 if (test_bit(DASD_FLAG_OFFLINE
, &device
->flags
) ||
1835 device
->state
!= device
->target
||
1836 !device
->discipline
->check_for_device_change
){
1837 dasd_put_device(device
);
1840 if (device
->discipline
->dump_sense_dbf
)
1841 device
->discipline
->dump_sense_dbf(device
, irb
, "uc");
1842 device
->discipline
->check_for_device_change(device
, NULL
, irb
);
1843 dasd_put_device(device
);
1845 return UC_TODO_RETRY
;
1847 EXPORT_SYMBOL_GPL(dasd_generic_uc_handler
);
1850 * If we have an error on a dasd_block layer request then we cancel
1851 * and return all further requests from the same dasd_block as well.
1853 static void __dasd_device_recovery(struct dasd_device
*device
,
1854 struct dasd_ccw_req
*ref_cqr
)
1856 struct list_head
*l
, *n
;
1857 struct dasd_ccw_req
*cqr
;
1860 * only requeue request that came from the dasd_block layer
1862 if (!ref_cqr
->block
)
1865 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1866 cqr
= list_entry(l
, struct dasd_ccw_req
, devlist
);
1867 if (cqr
->status
== DASD_CQR_QUEUED
&&
1868 ref_cqr
->block
== cqr
->block
) {
1869 cqr
->status
= DASD_CQR_CLEARED
;
1875 * Remove those ccw requests from the queue that need to be returned
1876 * to the upper layer.
1878 static void __dasd_device_process_ccw_queue(struct dasd_device
*device
,
1879 struct list_head
*final_queue
)
1881 struct list_head
*l
, *n
;
1882 struct dasd_ccw_req
*cqr
;
1884 /* Process request with final status. */
1885 list_for_each_safe(l
, n
, &device
->ccw_queue
) {
1886 cqr
= list_entry(l
, struct dasd_ccw_req
, devlist
);
1888 /* Skip any non-final request. */
1889 if (cqr
->status
== DASD_CQR_QUEUED
||
1890 cqr
->status
== DASD_CQR_IN_IO
||
1891 cqr
->status
== DASD_CQR_CLEAR_PENDING
)
1893 if (cqr
->status
== DASD_CQR_ERROR
) {
1894 __dasd_device_recovery(device
, cqr
);
1896 /* Rechain finished requests to final queue */
1897 list_move_tail(&cqr
->devlist
, final_queue
);
1902 * the cqrs from the final queue are returned to the upper layer
1903 * by setting a dasd_block state and calling the callback function
1905 static void __dasd_device_process_final_queue(struct dasd_device
*device
,
1906 struct list_head
*final_queue
)
1908 struct list_head
*l
, *n
;
1909 struct dasd_ccw_req
*cqr
;
1910 struct dasd_block
*block
;
1911 void (*callback
)(struct dasd_ccw_req
*, void *data
);
1912 void *callback_data
;
1913 char errorstring
[ERRORLENGTH
];
1915 list_for_each_safe(l
, n
, final_queue
) {
1916 cqr
= list_entry(l
, struct dasd_ccw_req
, devlist
);
1917 list_del_init(&cqr
->devlist
);
1919 callback
= cqr
->callback
;
1920 callback_data
= cqr
->callback_data
;
1922 spin_lock_bh(&block
->queue_lock
);
1923 switch (cqr
->status
) {
1924 case DASD_CQR_SUCCESS
:
1925 cqr
->status
= DASD_CQR_DONE
;
1927 case DASD_CQR_ERROR
:
1928 cqr
->status
= DASD_CQR_NEED_ERP
;
1930 case DASD_CQR_CLEARED
:
1931 cqr
->status
= DASD_CQR_TERMINATED
;
1934 /* internal error 12 - wrong cqr status*/
1935 snprintf(errorstring
, ERRORLENGTH
, "12 %p %x02", cqr
, cqr
->status
);
1936 dev_err(&device
->cdev
->dev
,
1937 "An error occurred in the DASD device driver, "
1938 "reason=%s\n", errorstring
);
1941 if (cqr
->callback
!= NULL
)
1942 (callback
)(cqr
, callback_data
);
1944 spin_unlock_bh(&block
->queue_lock
);
1949 * Take a look at the first request on the ccw queue and check
1950 * if it reached its expire time. If so, terminate the IO.
1952 static void __dasd_device_check_expire(struct dasd_device
*device
)
1954 struct dasd_ccw_req
*cqr
;
1956 if (list_empty(&device
->ccw_queue
))
1958 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, devlist
);
1959 if ((cqr
->status
== DASD_CQR_IN_IO
&& cqr
->expires
!= 0) &&
1960 (time_after_eq(jiffies
, cqr
->expires
+ cqr
->starttime
))) {
1961 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
1963 * IO in safe offline processing should not
1964 * run out of retries
1968 if (device
->discipline
->term_IO(cqr
) != 0) {
1969 /* Hmpf, try again in 5 sec */
1970 dev_err(&device
->cdev
->dev
,
1971 "cqr %p timed out (%lus) but cannot be "
1972 "ended, retrying in 5 s\n",
1973 cqr
, (cqr
->expires
/HZ
));
1974 cqr
->expires
+= 5*HZ
;
1975 dasd_device_set_timer(device
, 5*HZ
);
1977 dev_err(&device
->cdev
->dev
,
1978 "cqr %p timed out (%lus), %i retries "
1979 "remaining\n", cqr
, (cqr
->expires
/HZ
),
1986 * return 1 when device is not eligible for IO
1988 static int __dasd_device_is_unusable(struct dasd_device
*device
,
1989 struct dasd_ccw_req
*cqr
)
1991 int mask
= ~(DASD_STOPPED_DC_WAIT
| DASD_UNRESUMED_PM
);
1993 if (test_bit(DASD_FLAG_OFFLINE
, &device
->flags
) &&
1994 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
1996 * dasd is being set offline
1997 * but it is no safe offline where we have to allow I/O
2001 if (device
->stopped
) {
2002 if (device
->stopped
& mask
) {
2003 /* stopped and CQR will not change that. */
2006 if (!test_bit(DASD_CQR_VERIFY_PATH
, &cqr
->flags
)) {
2007 /* CQR is not able to change device to
2011 /* CQR required to get device operational. */
2017 * Take a look at the first request on the ccw queue and check
2018 * if it needs to be started.
2020 static void __dasd_device_start_head(struct dasd_device
*device
)
2022 struct dasd_ccw_req
*cqr
;
2025 if (list_empty(&device
->ccw_queue
))
2027 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, devlist
);
2028 if (cqr
->status
!= DASD_CQR_QUEUED
)
2030 /* if device is not usable return request to upper layer */
2031 if (__dasd_device_is_unusable(device
, cqr
)) {
2032 cqr
->intrc
= -EAGAIN
;
2033 cqr
->status
= DASD_CQR_CLEARED
;
2034 dasd_schedule_device_bh(device
);
2038 rc
= device
->discipline
->start_IO(cqr
);
2040 dasd_device_set_timer(device
, cqr
->expires
);
2041 else if (rc
== -EACCES
) {
2042 dasd_schedule_device_bh(device
);
2044 /* Hmpf, try again in 1/2 sec */
2045 dasd_device_set_timer(device
, 50);
2048 static void __dasd_device_check_path_events(struct dasd_device
*device
)
2052 if (!dasd_path_get_tbvpm(device
))
2055 if (device
->stopped
&
2056 ~(DASD_STOPPED_DC_WAIT
| DASD_UNRESUMED_PM
))
2058 rc
= device
->discipline
->verify_path(device
,
2059 dasd_path_get_tbvpm(device
));
2061 dasd_device_set_timer(device
, 50);
2063 dasd_path_clear_all_verify(device
);
2067 * Go through all request on the dasd_device request queue,
2068 * terminate them on the cdev if necessary, and return them to the
2069 * submitting layer via callback.
2071 * Make sure that all 'submitting layers' still exist when
2072 * this function is called!. In other words, when 'device' is a base
2073 * device then all block layer requests must have been removed before
2074 * via dasd_flush_block_queue.
2076 int dasd_flush_device_queue(struct dasd_device
*device
)
2078 struct dasd_ccw_req
*cqr
, *n
;
2080 struct list_head flush_queue
;
2082 INIT_LIST_HEAD(&flush_queue
);
2083 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
2085 list_for_each_entry_safe(cqr
, n
, &device
->ccw_queue
, devlist
) {
2086 /* Check status and move request to flush_queue */
2087 switch (cqr
->status
) {
2088 case DASD_CQR_IN_IO
:
2089 rc
= device
->discipline
->term_IO(cqr
);
2091 /* unable to terminate requeust */
2092 dev_err(&device
->cdev
->dev
,
2093 "Flushing the DASD request queue "
2094 "failed for request %p\n", cqr
);
2095 /* stop flush processing */
2099 case DASD_CQR_QUEUED
:
2100 cqr
->stopclk
= get_tod_clock();
2101 cqr
->status
= DASD_CQR_CLEARED
;
2103 default: /* no need to modify the others */
2106 list_move_tail(&cqr
->devlist
, &flush_queue
);
2109 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2111 * After this point all requests must be in state CLEAR_PENDING,
2112 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
2113 * one of the others.
2115 list_for_each_entry_safe(cqr
, n
, &flush_queue
, devlist
)
2116 wait_event(dasd_flush_wq
,
2117 (cqr
->status
!= DASD_CQR_CLEAR_PENDING
));
2119 * Now set each request back to TERMINATED, DONE or NEED_ERP
2120 * and call the callback function of flushed requests
2122 __dasd_device_process_final_queue(device
, &flush_queue
);
2125 EXPORT_SYMBOL_GPL(dasd_flush_device_queue
);
2128 * Acquire the device lock and process queues for the device.
2130 static void dasd_device_tasklet(struct dasd_device
*device
)
2132 struct list_head final_queue
;
2134 atomic_set (&device
->tasklet_scheduled
, 0);
2135 INIT_LIST_HEAD(&final_queue
);
2136 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
2137 /* Check expire time of first request on the ccw queue. */
2138 __dasd_device_check_expire(device
);
2139 /* find final requests on ccw queue */
2140 __dasd_device_process_ccw_queue(device
, &final_queue
);
2141 __dasd_device_check_path_events(device
);
2142 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2143 /* Now call the callback function of requests with final status */
2144 __dasd_device_process_final_queue(device
, &final_queue
);
2145 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
2146 /* Now check if the head of the ccw queue needs to be started. */
2147 __dasd_device_start_head(device
);
2148 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2149 if (waitqueue_active(&shutdown_waitq
))
2150 wake_up(&shutdown_waitq
);
2151 dasd_put_device(device
);
2155 * Schedules a call to dasd_tasklet over the device tasklet.
2157 void dasd_schedule_device_bh(struct dasd_device
*device
)
2159 /* Protect against rescheduling. */
2160 if (atomic_cmpxchg (&device
->tasklet_scheduled
, 0, 1) != 0)
2162 dasd_get_device(device
);
2163 tasklet_hi_schedule(&device
->tasklet
);
2165 EXPORT_SYMBOL(dasd_schedule_device_bh
);
2167 void dasd_device_set_stop_bits(struct dasd_device
*device
, int bits
)
2169 device
->stopped
|= bits
;
2171 EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits
);
2173 void dasd_device_remove_stop_bits(struct dasd_device
*device
, int bits
)
2175 device
->stopped
&= ~bits
;
2176 if (!device
->stopped
)
2177 wake_up(&generic_waitq
);
2179 EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits
);
2182 * Queue a request to the head of the device ccw_queue.
2183 * Start the I/O if possible.
2185 void dasd_add_request_head(struct dasd_ccw_req
*cqr
)
2187 struct dasd_device
*device
;
2188 unsigned long flags
;
2190 device
= cqr
->startdev
;
2191 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
2192 cqr
->status
= DASD_CQR_QUEUED
;
2193 list_add(&cqr
->devlist
, &device
->ccw_queue
);
2194 /* let the bh start the request to keep them in order */
2195 dasd_schedule_device_bh(device
);
2196 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
2198 EXPORT_SYMBOL(dasd_add_request_head
);
2201 * Queue a request to the tail of the device ccw_queue.
2202 * Start the I/O if possible.
2204 void dasd_add_request_tail(struct dasd_ccw_req
*cqr
)
2206 struct dasd_device
*device
;
2207 unsigned long flags
;
2209 device
= cqr
->startdev
;
2210 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
2211 cqr
->status
= DASD_CQR_QUEUED
;
2212 list_add_tail(&cqr
->devlist
, &device
->ccw_queue
);
2213 /* let the bh start the request to keep them in order */
2214 dasd_schedule_device_bh(device
);
2215 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
2217 EXPORT_SYMBOL(dasd_add_request_tail
);
2220 * Wakeup helper for the 'sleep_on' functions.
2222 void dasd_wakeup_cb(struct dasd_ccw_req
*cqr
, void *data
)
2224 spin_lock_irq(get_ccwdev_lock(cqr
->startdev
->cdev
));
2225 cqr
->callback_data
= DASD_SLEEPON_END_TAG
;
2226 spin_unlock_irq(get_ccwdev_lock(cqr
->startdev
->cdev
));
2227 wake_up(&generic_waitq
);
2229 EXPORT_SYMBOL_GPL(dasd_wakeup_cb
);
2231 static inline int _wait_for_wakeup(struct dasd_ccw_req
*cqr
)
2233 struct dasd_device
*device
;
2236 device
= cqr
->startdev
;
2237 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
2238 rc
= (cqr
->callback_data
== DASD_SLEEPON_END_TAG
);
2239 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2244 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
2246 static int __dasd_sleep_on_erp(struct dasd_ccw_req
*cqr
)
2248 struct dasd_device
*device
;
2249 dasd_erp_fn_t erp_fn
;
2251 if (cqr
->status
== DASD_CQR_FILLED
)
2253 device
= cqr
->startdev
;
2254 if (test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
)) {
2255 if (cqr
->status
== DASD_CQR_TERMINATED
) {
2256 device
->discipline
->handle_terminated_request(cqr
);
2259 if (cqr
->status
== DASD_CQR_NEED_ERP
) {
2260 erp_fn
= device
->discipline
->erp_action(cqr
);
2264 if (cqr
->status
== DASD_CQR_FAILED
)
2265 dasd_log_sense(cqr
, &cqr
->irb
);
2267 __dasd_process_erp(device
, cqr
);
2274 static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req
*cqr
)
2276 if (test_bit(DASD_CQR_FLAGS_USE_ERP
, &cqr
->flags
)) {
2277 if (cqr
->refers
) /* erp is not done yet */
2279 return ((cqr
->status
!= DASD_CQR_DONE
) &&
2280 (cqr
->status
!= DASD_CQR_FAILED
));
2282 return (cqr
->status
== DASD_CQR_FILLED
);
2285 static int _dasd_sleep_on(struct dasd_ccw_req
*maincqr
, int interruptible
)
2287 struct dasd_device
*device
;
2289 struct list_head ccw_queue
;
2290 struct dasd_ccw_req
*cqr
;
2292 INIT_LIST_HEAD(&ccw_queue
);
2293 maincqr
->status
= DASD_CQR_FILLED
;
2294 device
= maincqr
->startdev
;
2295 list_add(&maincqr
->blocklist
, &ccw_queue
);
2296 for (cqr
= maincqr
; __dasd_sleep_on_loop_condition(cqr
);
2297 cqr
= list_first_entry(&ccw_queue
,
2298 struct dasd_ccw_req
, blocklist
)) {
2300 if (__dasd_sleep_on_erp(cqr
))
2302 if (cqr
->status
!= DASD_CQR_FILLED
) /* could be failed */
2304 if (test_bit(DASD_FLAG_LOCK_STOLEN
, &device
->flags
) &&
2305 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
2306 cqr
->status
= DASD_CQR_FAILED
;
2307 cqr
->intrc
= -EPERM
;
2310 /* Non-temporary stop condition will trigger fail fast */
2311 if (device
->stopped
& ~DASD_STOPPED_PENDING
&&
2312 test_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
) &&
2313 (!dasd_eer_enabled(device
))) {
2314 cqr
->status
= DASD_CQR_FAILED
;
2315 cqr
->intrc
= -ENOLINK
;
2319 * Don't try to start requests if device is in
2320 * offline processing, it might wait forever
2322 if (test_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
2323 cqr
->status
= DASD_CQR_FAILED
;
2324 cqr
->intrc
= -ENODEV
;
2328 * Don't try to start requests if device is stopped
2329 * except path verification requests
2331 if (!test_bit(DASD_CQR_VERIFY_PATH
, &cqr
->flags
)) {
2332 if (interruptible
) {
2333 rc
= wait_event_interruptible(
2334 generic_waitq
, !(device
->stopped
));
2335 if (rc
== -ERESTARTSYS
) {
2336 cqr
->status
= DASD_CQR_FAILED
;
2337 maincqr
->intrc
= rc
;
2341 wait_event(generic_waitq
, !(device
->stopped
));
2344 cqr
->callback
= dasd_wakeup_cb
;
2346 cqr
->callback_data
= DASD_SLEEPON_START_TAG
;
2347 dasd_add_request_tail(cqr
);
2348 if (interruptible
) {
2349 rc
= wait_event_interruptible(
2350 generic_waitq
, _wait_for_wakeup(cqr
));
2351 if (rc
== -ERESTARTSYS
) {
2352 dasd_cancel_req(cqr
);
2353 /* wait (non-interruptible) for final status */
2354 wait_event(generic_waitq
,
2355 _wait_for_wakeup(cqr
));
2356 cqr
->status
= DASD_CQR_FAILED
;
2357 maincqr
->intrc
= rc
;
2361 wait_event(generic_waitq
, _wait_for_wakeup(cqr
));
2364 maincqr
->endclk
= get_tod_clock();
2365 if ((maincqr
->status
!= DASD_CQR_DONE
) &&
2366 (maincqr
->intrc
!= -ERESTARTSYS
))
2367 dasd_log_sense(maincqr
, &maincqr
->irb
);
2368 if (maincqr
->status
== DASD_CQR_DONE
)
2370 else if (maincqr
->intrc
)
2371 rc
= maincqr
->intrc
;
2377 static inline int _wait_for_wakeup_queue(struct list_head
*ccw_queue
)
2379 struct dasd_ccw_req
*cqr
;
2381 list_for_each_entry(cqr
, ccw_queue
, blocklist
) {
2382 if (cqr
->callback_data
!= DASD_SLEEPON_END_TAG
)
2389 static int _dasd_sleep_on_queue(struct list_head
*ccw_queue
, int interruptible
)
2391 struct dasd_device
*device
;
2392 struct dasd_ccw_req
*cqr
, *n
;
2397 list_for_each_entry_safe(cqr
, n
, ccw_queue
, blocklist
) {
2398 device
= cqr
->startdev
;
2399 if (cqr
->status
!= DASD_CQR_FILLED
) /*could be failed*/
2402 if (test_bit(DASD_FLAG_LOCK_STOLEN
, &device
->flags
) &&
2403 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
2404 cqr
->status
= DASD_CQR_FAILED
;
2405 cqr
->intrc
= -EPERM
;
2408 /*Non-temporary stop condition will trigger fail fast*/
2409 if (device
->stopped
& ~DASD_STOPPED_PENDING
&&
2410 test_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
) &&
2411 !dasd_eer_enabled(device
)) {
2412 cqr
->status
= DASD_CQR_FAILED
;
2413 cqr
->intrc
= -EAGAIN
;
2417 /*Don't try to start requests if device is stopped*/
2418 if (interruptible
) {
2419 rc
= wait_event_interruptible(
2420 generic_waitq
, !device
->stopped
);
2421 if (rc
== -ERESTARTSYS
) {
2422 cqr
->status
= DASD_CQR_FAILED
;
2427 wait_event(generic_waitq
, !(device
->stopped
));
2430 cqr
->callback
= dasd_wakeup_cb
;
2431 cqr
->callback_data
= DASD_SLEEPON_START_TAG
;
2432 dasd_add_request_tail(cqr
);
2435 wait_event(generic_waitq
, _wait_for_wakeup_queue(ccw_queue
));
2438 list_for_each_entry_safe(cqr
, n
, ccw_queue
, blocklist
) {
2440 * In some cases the 'File Protected' or 'Incorrect Length'
2441 * error might be expected and error recovery would be
2442 * unnecessary in these cases. Check if the according suppress
2445 sense
= dasd_get_sense(&cqr
->irb
);
2446 if (sense
&& sense
[1] & SNS1_FILE_PROTECTED
&&
2447 test_bit(DASD_CQR_SUPPRESS_FP
, &cqr
->flags
))
2449 if (scsw_cstat(&cqr
->irb
.scsw
) == 0x40 &&
2450 test_bit(DASD_CQR_SUPPRESS_IL
, &cqr
->flags
))
2454 * for alias devices simplify error recovery and
2455 * return to upper layer
2456 * do not skip ERP requests
2458 if (cqr
->startdev
!= cqr
->basedev
&& !cqr
->refers
&&
2459 (cqr
->status
== DASD_CQR_TERMINATED
||
2460 cqr
->status
== DASD_CQR_NEED_ERP
))
2463 /* normal recovery for basedev IO */
2464 if (__dasd_sleep_on_erp(cqr
))
2465 /* handle erp first */
2473 * Queue a request to the tail of the device ccw_queue and wait for
2476 int dasd_sleep_on(struct dasd_ccw_req
*cqr
)
2478 return _dasd_sleep_on(cqr
, 0);
2480 EXPORT_SYMBOL(dasd_sleep_on
);
2483 * Start requests from a ccw_queue and wait for their completion.
2485 int dasd_sleep_on_queue(struct list_head
*ccw_queue
)
2487 return _dasd_sleep_on_queue(ccw_queue
, 0);
2489 EXPORT_SYMBOL(dasd_sleep_on_queue
);
2492 * Queue a request to the tail of the device ccw_queue and wait
2493 * interruptible for it's completion.
2495 int dasd_sleep_on_interruptible(struct dasd_ccw_req
*cqr
)
2497 return _dasd_sleep_on(cqr
, 1);
2499 EXPORT_SYMBOL(dasd_sleep_on_interruptible
);
2502 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
2503 * for eckd devices) the currently running request has to be terminated
2504 * and be put back to status queued, before the special request is added
2505 * to the head of the queue. Then the special request is waited on normally.
2507 static inline int _dasd_term_running_cqr(struct dasd_device
*device
)
2509 struct dasd_ccw_req
*cqr
;
2512 if (list_empty(&device
->ccw_queue
))
2514 cqr
= list_entry(device
->ccw_queue
.next
, struct dasd_ccw_req
, devlist
);
2515 rc
= device
->discipline
->term_IO(cqr
);
2518 * CQR terminated because a more important request is pending.
2519 * Undo decreasing of retry counter because this is
2520 * not an error case.
2526 int dasd_sleep_on_immediatly(struct dasd_ccw_req
*cqr
)
2528 struct dasd_device
*device
;
2531 device
= cqr
->startdev
;
2532 if (test_bit(DASD_FLAG_LOCK_STOLEN
, &device
->flags
) &&
2533 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
2534 cqr
->status
= DASD_CQR_FAILED
;
2535 cqr
->intrc
= -EPERM
;
2538 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
2539 rc
= _dasd_term_running_cqr(device
);
2541 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2544 cqr
->callback
= dasd_wakeup_cb
;
2545 cqr
->callback_data
= DASD_SLEEPON_START_TAG
;
2546 cqr
->status
= DASD_CQR_QUEUED
;
2548 * add new request as second
2549 * first the terminated cqr needs to be finished
2551 list_add(&cqr
->devlist
, device
->ccw_queue
.next
);
2553 /* let the bh start the request to keep them in order */
2554 dasd_schedule_device_bh(device
);
2556 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
2558 wait_event(generic_waitq
, _wait_for_wakeup(cqr
));
2560 if (cqr
->status
== DASD_CQR_DONE
)
2562 else if (cqr
->intrc
)
2568 dasd_schedule_device_bh(device
);
2570 dasd_schedule_block_bh(device
->block
);
2574 EXPORT_SYMBOL(dasd_sleep_on_immediatly
);
2577 * Cancels a request that was started with dasd_sleep_on_req.
2578 * This is useful to timeout requests. The request will be
2579 * terminated if it is currently in i/o.
2580 * Returns 0 if request termination was successful
2581 * negative error code if termination failed
2582 * Cancellation of a request is an asynchronous operation! The calling
2583 * function has to wait until the request is properly returned via callback.
2585 int dasd_cancel_req(struct dasd_ccw_req
*cqr
)
2587 struct dasd_device
*device
= cqr
->startdev
;
2588 unsigned long flags
;
2592 spin_lock_irqsave(get_ccwdev_lock(device
->cdev
), flags
);
2593 switch (cqr
->status
) {
2594 case DASD_CQR_QUEUED
:
2595 /* request was not started - just set to cleared */
2596 cqr
->status
= DASD_CQR_CLEARED
;
2597 if (cqr
->callback_data
== DASD_SLEEPON_START_TAG
)
2598 cqr
->callback_data
= DASD_SLEEPON_END_TAG
;
2600 case DASD_CQR_IN_IO
:
2601 /* request in IO - terminate IO and release again */
2602 rc
= device
->discipline
->term_IO(cqr
);
2604 dev_err(&device
->cdev
->dev
,
2605 "Cancelling request %p failed with rc=%d\n",
2608 cqr
->stopclk
= get_tod_clock();
2611 default: /* already finished or clear pending - do nothing */
2614 spin_unlock_irqrestore(get_ccwdev_lock(device
->cdev
), flags
);
2615 dasd_schedule_device_bh(device
);
2618 EXPORT_SYMBOL(dasd_cancel_req
);
2621 * SECTION: Operations of the dasd_block layer.
2625 * Timeout function for dasd_block. This is used when the block layer
2626 * is waiting for something that may not come reliably, (e.g. a state
2629 static void dasd_block_timeout(unsigned long ptr
)
2631 unsigned long flags
;
2632 struct dasd_block
*block
;
2634 block
= (struct dasd_block
*) ptr
;
2635 spin_lock_irqsave(get_ccwdev_lock(block
->base
->cdev
), flags
);
2636 /* re-activate request queue */
2637 dasd_device_remove_stop_bits(block
->base
, DASD_STOPPED_PENDING
);
2638 spin_unlock_irqrestore(get_ccwdev_lock(block
->base
->cdev
), flags
);
2639 dasd_schedule_block_bh(block
);
2640 blk_mq_run_hw_queues(block
->request_queue
, true);
2644 * Setup timeout for a dasd_block in jiffies.
2646 void dasd_block_set_timer(struct dasd_block
*block
, int expires
)
2649 del_timer(&block
->timer
);
2651 mod_timer(&block
->timer
, jiffies
+ expires
);
2653 EXPORT_SYMBOL(dasd_block_set_timer
);
2656 * Clear timeout for a dasd_block.
2658 void dasd_block_clear_timer(struct dasd_block
*block
)
2660 del_timer(&block
->timer
);
2662 EXPORT_SYMBOL(dasd_block_clear_timer
);
2665 * Process finished error recovery ccw.
2667 static void __dasd_process_erp(struct dasd_device
*device
,
2668 struct dasd_ccw_req
*cqr
)
2670 dasd_erp_fn_t erp_fn
;
2672 if (cqr
->status
== DASD_CQR_DONE
)
2673 DBF_DEV_EVENT(DBF_NOTICE
, device
, "%s", "ERP successful");
2675 dev_err(&device
->cdev
->dev
, "ERP failed for the DASD\n");
2676 erp_fn
= device
->discipline
->erp_postaction(cqr
);
2680 static void __dasd_cleanup_cqr(struct dasd_ccw_req
*cqr
)
2682 struct request
*req
;
2683 blk_status_t error
= BLK_STS_OK
;
2686 req
= (struct request
*) cqr
->callback_data
;
2687 dasd_profile_end(cqr
->block
, cqr
, req
);
2689 status
= cqr
->block
->base
->discipline
->free_cp(cqr
, req
);
2691 error
= errno_to_blk_status(status
);
2692 else if (status
== 0) {
2693 switch (cqr
->intrc
) {
2695 error
= BLK_STS_NEXUS
;
2698 error
= BLK_STS_TRANSPORT
;
2701 error
= BLK_STS_TIMEOUT
;
2704 error
= BLK_STS_IOERR
;
2710 * We need to take care for ETIMEDOUT errors here since the
2711 * complete callback does not get called in this case.
2712 * Take care of all errors here and avoid additional code to
2713 * transfer the error value to the complete callback.
2716 blk_mq_end_request(req
, error
);
2717 blk_mq_run_hw_queues(req
->q
, true);
2719 blk_mq_complete_request(req
);
2724 * Process ccw request queue.
2726 static void __dasd_process_block_ccw_queue(struct dasd_block
*block
,
2727 struct list_head
*final_queue
)
2729 struct list_head
*l
, *n
;
2730 struct dasd_ccw_req
*cqr
;
2731 dasd_erp_fn_t erp_fn
;
2732 unsigned long flags
;
2733 struct dasd_device
*base
= block
->base
;
2736 /* Process request with final status. */
2737 list_for_each_safe(l
, n
, &block
->ccw_queue
) {
2738 cqr
= list_entry(l
, struct dasd_ccw_req
, blocklist
);
2739 if (cqr
->status
!= DASD_CQR_DONE
&&
2740 cqr
->status
!= DASD_CQR_FAILED
&&
2741 cqr
->status
!= DASD_CQR_NEED_ERP
&&
2742 cqr
->status
!= DASD_CQR_TERMINATED
)
2745 if (cqr
->status
== DASD_CQR_TERMINATED
) {
2746 base
->discipline
->handle_terminated_request(cqr
);
2750 /* Process requests that may be recovered */
2751 if (cqr
->status
== DASD_CQR_NEED_ERP
) {
2752 erp_fn
= base
->discipline
->erp_action(cqr
);
2753 if (IS_ERR(erp_fn(cqr
)))
2758 /* log sense for fatal error */
2759 if (cqr
->status
== DASD_CQR_FAILED
) {
2760 dasd_log_sense(cqr
, &cqr
->irb
);
2763 /* First of all call extended error reporting. */
2764 if (dasd_eer_enabled(base
) &&
2765 cqr
->status
== DASD_CQR_FAILED
) {
2766 dasd_eer_write(base
, cqr
, DASD_EER_FATALERROR
);
2768 /* restart request */
2769 cqr
->status
= DASD_CQR_FILLED
;
2771 spin_lock_irqsave(get_ccwdev_lock(base
->cdev
), flags
);
2772 dasd_device_set_stop_bits(base
, DASD_STOPPED_QUIESCE
);
2773 spin_unlock_irqrestore(get_ccwdev_lock(base
->cdev
),
2778 /* Process finished ERP request. */
2780 __dasd_process_erp(base
, cqr
);
2784 /* Rechain finished requests to final queue */
2785 cqr
->endclk
= get_tod_clock();
2786 list_move_tail(&cqr
->blocklist
, final_queue
);
2790 static void dasd_return_cqr_cb(struct dasd_ccw_req
*cqr
, void *data
)
2792 dasd_schedule_block_bh(cqr
->block
);
2795 static void __dasd_block_start_head(struct dasd_block
*block
)
2797 struct dasd_ccw_req
*cqr
;
2799 if (list_empty(&block
->ccw_queue
))
2801 /* We allways begin with the first requests on the queue, as some
2802 * of previously started requests have to be enqueued on a
2803 * dasd_device again for error recovery.
2805 list_for_each_entry(cqr
, &block
->ccw_queue
, blocklist
) {
2806 if (cqr
->status
!= DASD_CQR_FILLED
)
2808 if (test_bit(DASD_FLAG_LOCK_STOLEN
, &block
->base
->flags
) &&
2809 !test_bit(DASD_CQR_ALLOW_SLOCK
, &cqr
->flags
)) {
2810 cqr
->status
= DASD_CQR_FAILED
;
2811 cqr
->intrc
= -EPERM
;
2812 dasd_schedule_block_bh(block
);
2815 /* Non-temporary stop condition will trigger fail fast */
2816 if (block
->base
->stopped
& ~DASD_STOPPED_PENDING
&&
2817 test_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
) &&
2818 (!dasd_eer_enabled(block
->base
))) {
2819 cqr
->status
= DASD_CQR_FAILED
;
2820 cqr
->intrc
= -ENOLINK
;
2821 dasd_schedule_block_bh(block
);
2824 /* Don't try to start requests if device is stopped */
2825 if (block
->base
->stopped
)
2828 /* just a fail safe check, should not happen */
2830 cqr
->startdev
= block
->base
;
2832 /* make sure that the requests we submit find their way back */
2833 cqr
->callback
= dasd_return_cqr_cb
;
2835 dasd_add_request_tail(cqr
);
2840 * Central dasd_block layer routine. Takes requests from the generic
2841 * block layer request queue, creates ccw requests, enqueues them on
2842 * a dasd_device and processes ccw requests that have been returned.
2844 static void dasd_block_tasklet(struct dasd_block
*block
)
2846 struct list_head final_queue
;
2847 struct list_head
*l
, *n
;
2848 struct dasd_ccw_req
*cqr
;
2849 struct dasd_queue
*dq
;
2851 atomic_set(&block
->tasklet_scheduled
, 0);
2852 INIT_LIST_HEAD(&final_queue
);
2853 spin_lock_irq(&block
->queue_lock
);
2854 /* Finish off requests on ccw queue */
2855 __dasd_process_block_ccw_queue(block
, &final_queue
);
2856 spin_unlock_irq(&block
->queue_lock
);
2858 /* Now call the callback function of requests with final status */
2859 list_for_each_safe(l
, n
, &final_queue
) {
2860 cqr
= list_entry(l
, struct dasd_ccw_req
, blocklist
);
2862 spin_lock_irq(&dq
->lock
);
2863 list_del_init(&cqr
->blocklist
);
2864 __dasd_cleanup_cqr(cqr
);
2865 spin_unlock_irq(&dq
->lock
);
2868 spin_lock_irq(&block
->queue_lock
);
2869 /* Now check if the head of the ccw queue needs to be started. */
2870 __dasd_block_start_head(block
);
2871 spin_unlock_irq(&block
->queue_lock
);
2873 if (waitqueue_active(&shutdown_waitq
))
2874 wake_up(&shutdown_waitq
);
2875 dasd_put_device(block
->base
);
2878 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req
*cqr
, void *data
)
2880 wake_up(&dasd_flush_wq
);
2884 * Requeue a request back to the block request queue
2885 * only works for block requests
2887 static int _dasd_requeue_request(struct dasd_ccw_req
*cqr
)
2889 struct dasd_block
*block
= cqr
->block
;
2890 struct request
*req
;
2894 spin_lock_irq(&cqr
->dq
->lock
);
2895 req
= (struct request
*) cqr
->callback_data
;
2896 blk_mq_requeue_request(req
, false);
2897 spin_unlock_irq(&cqr
->dq
->lock
);
2903 * Go through all request on the dasd_block request queue, cancel them
2904 * on the respective dasd_device, and return them to the generic
2907 static int dasd_flush_block_queue(struct dasd_block
*block
)
2909 struct dasd_ccw_req
*cqr
, *n
;
2911 struct list_head flush_queue
;
2912 unsigned long flags
;
2914 INIT_LIST_HEAD(&flush_queue
);
2915 spin_lock_bh(&block
->queue_lock
);
2918 list_for_each_entry_safe(cqr
, n
, &block
->ccw_queue
, blocklist
) {
2919 /* if this request currently owned by a dasd_device cancel it */
2920 if (cqr
->status
>= DASD_CQR_QUEUED
)
2921 rc
= dasd_cancel_req(cqr
);
2924 /* Rechain request (including erp chain) so it won't be
2925 * touched by the dasd_block_tasklet anymore.
2926 * Replace the callback so we notice when the request
2927 * is returned from the dasd_device layer.
2929 cqr
->callback
= _dasd_wake_block_flush_cb
;
2930 for (i
= 0; cqr
!= NULL
; cqr
= cqr
->refers
, i
++)
2931 list_move_tail(&cqr
->blocklist
, &flush_queue
);
2933 /* moved more than one request - need to restart */
2936 spin_unlock_bh(&block
->queue_lock
);
2937 /* Now call the callback function of flushed requests */
2939 list_for_each_entry_safe(cqr
, n
, &flush_queue
, blocklist
) {
2940 wait_event(dasd_flush_wq
, (cqr
->status
< DASD_CQR_QUEUED
));
2941 /* Process finished ERP request. */
2943 spin_lock_bh(&block
->queue_lock
);
2944 __dasd_process_erp(block
->base
, cqr
);
2945 spin_unlock_bh(&block
->queue_lock
);
2946 /* restart list_for_xx loop since dasd_process_erp
2947 * might remove multiple elements */
2950 /* call the callback function */
2951 spin_lock_irqsave(&cqr
->dq
->lock
, flags
);
2952 cqr
->endclk
= get_tod_clock();
2953 list_del_init(&cqr
->blocklist
);
2954 __dasd_cleanup_cqr(cqr
);
2955 spin_unlock_irqrestore(&cqr
->dq
->lock
, flags
);
2961 * Schedules a call to dasd_tasklet over the device tasklet.
2963 void dasd_schedule_block_bh(struct dasd_block
*block
)
2965 /* Protect against rescheduling. */
2966 if (atomic_cmpxchg(&block
->tasklet_scheduled
, 0, 1) != 0)
2968 /* life cycle of block is bound to it's base device */
2969 dasd_get_device(block
->base
);
2970 tasklet_hi_schedule(&block
->tasklet
);
2972 EXPORT_SYMBOL(dasd_schedule_block_bh
);
2976 * SECTION: external block device operations
2977 * (request queue handling, open, release, etc.)
2981 * Dasd request queue function. Called from ll_rw_blk.c
2983 static blk_status_t
do_dasd_request(struct blk_mq_hw_ctx
*hctx
,
2984 const struct blk_mq_queue_data
*qd
)
2986 struct dasd_block
*block
= hctx
->queue
->queuedata
;
2987 struct dasd_queue
*dq
= hctx
->driver_data
;
2988 struct request
*req
= qd
->rq
;
2989 struct dasd_device
*basedev
;
2990 struct dasd_ccw_req
*cqr
;
2991 blk_status_t rc
= BLK_STS_OK
;
2993 basedev
= block
->base
;
2994 spin_lock_irq(&dq
->lock
);
2995 if (basedev
->state
< DASD_STATE_READY
) {
2996 DBF_DEV_EVENT(DBF_ERR
, basedev
,
2997 "device not ready for request %p", req
);
3003 * if device is stopped do not fetch new requests
3004 * except failfast is active which will let requests fail
3005 * immediately in __dasd_block_start_head()
3007 if (basedev
->stopped
&& !(basedev
->features
& DASD_FEATURE_FAILFAST
)) {
3008 DBF_DEV_EVENT(DBF_ERR
, basedev
,
3009 "device stopped request %p", req
);
3010 rc
= BLK_STS_RESOURCE
;
3014 if (basedev
->features
& DASD_FEATURE_READONLY
&&
3015 rq_data_dir(req
) == WRITE
) {
3016 DBF_DEV_EVENT(DBF_ERR
, basedev
,
3017 "Rejecting write request %p", req
);
3022 if (test_bit(DASD_FLAG_ABORTALL
, &basedev
->flags
) &&
3023 (basedev
->features
& DASD_FEATURE_FAILFAST
||
3024 blk_noretry_request(req
))) {
3025 DBF_DEV_EVENT(DBF_ERR
, basedev
,
3026 "Rejecting failfast request %p", req
);
3031 cqr
= basedev
->discipline
->build_cp(basedev
, block
, req
);
3033 if (PTR_ERR(cqr
) == -EBUSY
||
3034 PTR_ERR(cqr
) == -ENOMEM
||
3035 PTR_ERR(cqr
) == -EAGAIN
) {
3036 rc
= BLK_STS_RESOURCE
;
3039 DBF_DEV_EVENT(DBF_ERR
, basedev
,
3040 "CCW creation failed (rc=%ld) on request %p",
3046 * Note: callback is set to dasd_return_cqr_cb in
3047 * __dasd_block_start_head to cover erp requests as well
3049 cqr
->callback_data
= req
;
3050 cqr
->status
= DASD_CQR_FILLED
;
3052 req
->completion_data
= cqr
;
3053 blk_mq_start_request(req
);
3054 spin_lock(&block
->queue_lock
);
3055 list_add_tail(&cqr
->blocklist
, &block
->ccw_queue
);
3056 INIT_LIST_HEAD(&cqr
->devlist
);
3057 dasd_profile_start(block
, cqr
, req
);
3058 dasd_schedule_block_bh(block
);
3059 spin_unlock(&block
->queue_lock
);
3062 spin_unlock_irq(&dq
->lock
);
3067 * Block timeout callback, called from the block layer
3070 * BLK_EH_RESET_TIMER if the request should be left running
3071 * BLK_EH_NOT_HANDLED if the request is handled or terminated
3074 enum blk_eh_timer_return
dasd_times_out(struct request
*req
, bool reserved
)
3076 struct dasd_ccw_req
*cqr
= req
->completion_data
;
3077 struct dasd_block
*block
= req
->q
->queuedata
;
3078 struct dasd_device
*device
;
3079 unsigned long flags
;
3083 return BLK_EH_NOT_HANDLED
;
3085 spin_lock_irqsave(&cqr
->dq
->lock
, flags
);
3086 device
= cqr
->startdev
? cqr
->startdev
: block
->base
;
3087 if (!device
->blk_timeout
) {
3088 spin_unlock_irqrestore(&cqr
->dq
->lock
, flags
);
3089 return BLK_EH_RESET_TIMER
;
3091 DBF_DEV_EVENT(DBF_WARNING
, device
,
3092 " dasd_times_out cqr %p status %x",
3095 spin_lock(&block
->queue_lock
);
3096 spin_lock(get_ccwdev_lock(device
->cdev
));
3098 cqr
->intrc
= -ETIMEDOUT
;
3099 if (cqr
->status
>= DASD_CQR_QUEUED
) {
3100 spin_unlock(get_ccwdev_lock(device
->cdev
));
3101 rc
= dasd_cancel_req(cqr
);
3102 } else if (cqr
->status
== DASD_CQR_FILLED
||
3103 cqr
->status
== DASD_CQR_NEED_ERP
) {
3104 cqr
->status
= DASD_CQR_TERMINATED
;
3105 spin_unlock(get_ccwdev_lock(device
->cdev
));
3106 } else if (cqr
->status
== DASD_CQR_IN_ERP
) {
3107 struct dasd_ccw_req
*searchcqr
, *nextcqr
, *tmpcqr
;
3109 list_for_each_entry_safe(searchcqr
, nextcqr
,
3110 &block
->ccw_queue
, blocklist
) {
3112 while (tmpcqr
->refers
)
3113 tmpcqr
= tmpcqr
->refers
;
3116 /* searchcqr is an ERP request for cqr */
3117 searchcqr
->retries
= -1;
3118 searchcqr
->intrc
= -ETIMEDOUT
;
3119 if (searchcqr
->status
>= DASD_CQR_QUEUED
) {
3120 spin_unlock(get_ccwdev_lock(device
->cdev
));
3121 rc
= dasd_cancel_req(searchcqr
);
3122 spin_lock(get_ccwdev_lock(device
->cdev
));
3123 } else if ((searchcqr
->status
== DASD_CQR_FILLED
) ||
3124 (searchcqr
->status
== DASD_CQR_NEED_ERP
)) {
3125 searchcqr
->status
= DASD_CQR_TERMINATED
;
3127 } else if (searchcqr
->status
== DASD_CQR_IN_ERP
) {
3129 * Shouldn't happen; most recent ERP
3130 * request is at the front of queue
3136 spin_unlock(get_ccwdev_lock(device
->cdev
));
3138 dasd_schedule_block_bh(block
);
3139 spin_unlock(&block
->queue_lock
);
3140 spin_unlock_irqrestore(&cqr
->dq
->lock
, flags
);
3142 return rc
? BLK_EH_RESET_TIMER
: BLK_EH_NOT_HANDLED
;
3145 static int dasd_init_hctx(struct blk_mq_hw_ctx
*hctx
, void *data
,
3148 struct dasd_queue
*dq
= kzalloc(sizeof(*dq
), GFP_KERNEL
);
3153 spin_lock_init(&dq
->lock
);
3154 hctx
->driver_data
= dq
;
3159 static void dasd_exit_hctx(struct blk_mq_hw_ctx
*hctx
, unsigned int idx
)
3161 kfree(hctx
->driver_data
);
3162 hctx
->driver_data
= NULL
;
3165 static void dasd_request_done(struct request
*req
)
3167 blk_mq_end_request(req
, 0);
3168 blk_mq_run_hw_queues(req
->q
, true);
3171 static struct blk_mq_ops dasd_mq_ops
= {
3172 .queue_rq
= do_dasd_request
,
3173 .complete
= dasd_request_done
,
3174 .timeout
= dasd_times_out
,
3175 .init_hctx
= dasd_init_hctx
,
3176 .exit_hctx
= dasd_exit_hctx
,
3180 * Allocate and initialize request queue and default I/O scheduler.
3182 static int dasd_alloc_queue(struct dasd_block
*block
)
3186 block
->tag_set
.ops
= &dasd_mq_ops
;
3187 block
->tag_set
.nr_hw_queues
= DASD_NR_HW_QUEUES
;
3188 block
->tag_set
.queue_depth
= DASD_MAX_LCU_DEV
* DASD_REQ_PER_DEV
;
3189 block
->tag_set
.flags
= BLK_MQ_F_SHOULD_MERGE
;
3191 rc
= blk_mq_alloc_tag_set(&block
->tag_set
);
3195 block
->request_queue
= blk_mq_init_queue(&block
->tag_set
);
3196 if (IS_ERR(block
->request_queue
))
3197 return PTR_ERR(block
->request_queue
);
3199 block
->request_queue
->queuedata
= block
;
3205 * Allocate and initialize request queue.
3207 static void dasd_setup_queue(struct dasd_block
*block
)
3209 unsigned int logical_block_size
= block
->bp_block
;
3210 struct request_queue
*q
= block
->request_queue
;
3211 unsigned int max_bytes
, max_discard_sectors
;
3214 if (block
->base
->features
& DASD_FEATURE_USERAW
) {
3216 * the max_blocks value for raw_track access is 256
3217 * it is higher than the native ECKD value because we
3218 * only need one ccw per track
3219 * so the max_hw_sectors are
3220 * 2048 x 512B = 1024kB = 16 tracks
3224 max
= block
->base
->discipline
->max_blocks
<< block
->s2b_shift
;
3226 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, q
);
3227 q
->limits
.max_dev_sectors
= max
;
3228 blk_queue_logical_block_size(q
, logical_block_size
);
3229 blk_queue_max_hw_sectors(q
, max
);
3230 blk_queue_max_segments(q
, USHRT_MAX
);
3231 /* with page sized segments we can translate each segement into
3234 blk_queue_max_segment_size(q
, PAGE_SIZE
);
3235 blk_queue_segment_boundary(q
, PAGE_SIZE
- 1);
3237 /* Only activate blocklayer discard support for devices that support it */
3238 if (block
->base
->features
& DASD_FEATURE_DISCARD
) {
3239 q
->limits
.discard_granularity
= logical_block_size
;
3240 q
->limits
.discard_alignment
= PAGE_SIZE
;
3242 /* Calculate max_discard_sectors and make it PAGE aligned */
3243 max_bytes
= USHRT_MAX
* logical_block_size
;
3244 max_bytes
= ALIGN(max_bytes
, PAGE_SIZE
) - PAGE_SIZE
;
3245 max_discard_sectors
= max_bytes
/ logical_block_size
;
3247 blk_queue_max_discard_sectors(q
, max_discard_sectors
);
3248 blk_queue_max_write_zeroes_sectors(q
, max_discard_sectors
);
3249 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, q
);
3254 * Deactivate and free request queue.
3256 static void dasd_free_queue(struct dasd_block
*block
)
3258 if (block
->request_queue
) {
3259 blk_cleanup_queue(block
->request_queue
);
3260 blk_mq_free_tag_set(&block
->tag_set
);
3261 block
->request_queue
= NULL
;
3265 static int dasd_open(struct block_device
*bdev
, fmode_t mode
)
3267 struct dasd_device
*base
;
3270 base
= dasd_device_from_gendisk(bdev
->bd_disk
);
3274 atomic_inc(&base
->block
->open_count
);
3275 if (test_bit(DASD_FLAG_OFFLINE
, &base
->flags
)) {
3280 if (!try_module_get(base
->discipline
->owner
)) {
3285 if (dasd_probeonly
) {
3286 dev_info(&base
->cdev
->dev
,
3287 "Accessing the DASD failed because it is in "
3288 "probeonly mode\n");
3293 if (base
->state
<= DASD_STATE_BASIC
) {
3294 DBF_DEV_EVENT(DBF_ERR
, base
, " %s",
3295 " Cannot open unrecognized device");
3300 if ((mode
& FMODE_WRITE
) &&
3301 (test_bit(DASD_FLAG_DEVICE_RO
, &base
->flags
) ||
3302 (base
->features
& DASD_FEATURE_READONLY
))) {
3307 dasd_put_device(base
);
3311 module_put(base
->discipline
->owner
);
3313 atomic_dec(&base
->block
->open_count
);
3314 dasd_put_device(base
);
3318 static void dasd_release(struct gendisk
*disk
, fmode_t mode
)
3320 struct dasd_device
*base
= dasd_device_from_gendisk(disk
);
3322 atomic_dec(&base
->block
->open_count
);
3323 module_put(base
->discipline
->owner
);
3324 dasd_put_device(base
);
3329 * Return disk geometry.
3331 static int dasd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
3333 struct dasd_device
*base
;
3335 base
= dasd_device_from_gendisk(bdev
->bd_disk
);
3339 if (!base
->discipline
||
3340 !base
->discipline
->fill_geometry
) {
3341 dasd_put_device(base
);
3344 base
->discipline
->fill_geometry(base
->block
, geo
);
3345 geo
->start
= get_start_sect(bdev
) >> base
->block
->s2b_shift
;
3346 dasd_put_device(base
);
3350 const struct block_device_operations
3351 dasd_device_operations
= {
3352 .owner
= THIS_MODULE
,
3354 .release
= dasd_release
,
3355 .ioctl
= dasd_ioctl
,
3356 .compat_ioctl
= dasd_ioctl
,
3357 .getgeo
= dasd_getgeo
,
3360 /*******************************************************************************
3361 * end of block device operations
3367 #ifdef CONFIG_PROC_FS
3371 if (dasd_page_cache
!= NULL
) {
3372 kmem_cache_destroy(dasd_page_cache
);
3373 dasd_page_cache
= NULL
;
3375 dasd_gendisk_exit();
3377 if (dasd_debug_area
!= NULL
) {
3378 debug_unregister(dasd_debug_area
);
3379 dasd_debug_area
= NULL
;
3381 dasd_statistics_removeroot();
3385 * SECTION: common functions for ccw_driver use
3389 * Is the device read-only?
3390 * Note that this function does not report the setting of the
3391 * readonly device attribute, but how it is configured in z/VM.
3393 int dasd_device_is_ro(struct dasd_device
*device
)
3395 struct ccw_dev_id dev_id
;
3396 struct diag210 diag_data
;
3401 ccw_device_get_id(device
->cdev
, &dev_id
);
3402 memset(&diag_data
, 0, sizeof(diag_data
));
3403 diag_data
.vrdcdvno
= dev_id
.devno
;
3404 diag_data
.vrdclen
= sizeof(diag_data
);
3405 rc
= diag210(&diag_data
);
3406 if (rc
== 0 || rc
== 2) {
3407 return diag_data
.vrdcvfla
& 0x80;
3409 DBF_EVENT(DBF_WARNING
, "diag210 failed for dev=%04x with rc=%d",
3414 EXPORT_SYMBOL_GPL(dasd_device_is_ro
);
3416 static void dasd_generic_auto_online(void *data
, async_cookie_t cookie
)
3418 struct ccw_device
*cdev
= data
;
3421 ret
= ccw_device_set_online(cdev
);
3423 pr_warn("%s: Setting the DASD online failed with rc=%d\n",
3424 dev_name(&cdev
->dev
), ret
);
3428 * Initial attempt at a probe function. this can be simplified once
3429 * the other detection code is gone.
3431 int dasd_generic_probe(struct ccw_device
*cdev
,
3432 struct dasd_discipline
*discipline
)
3436 ret
= dasd_add_sysfs_files(cdev
);
3438 DBF_EVENT_DEVID(DBF_WARNING
, cdev
, "%s",
3439 "dasd_generic_probe: could not add "
3443 cdev
->handler
= &dasd_int_handler
;
3446 * Automatically online either all dasd devices (dasd_autodetect)
3447 * or all devices specified with dasd= parameters during
3450 if ((dasd_get_feature(cdev
, DASD_FEATURE_INITIAL_ONLINE
) > 0 ) ||
3451 (dasd_autodetect
&& dasd_busid_known(dev_name(&cdev
->dev
)) != 0))
3452 async_schedule(dasd_generic_auto_online
, cdev
);
3455 EXPORT_SYMBOL_GPL(dasd_generic_probe
);
3457 void dasd_generic_free_discipline(struct dasd_device
*device
)
3459 /* Forget the discipline information. */
3460 if (device
->discipline
) {
3461 if (device
->discipline
->uncheck_device
)
3462 device
->discipline
->uncheck_device(device
);
3463 module_put(device
->discipline
->owner
);
3464 device
->discipline
= NULL
;
3466 if (device
->base_discipline
) {
3467 module_put(device
->base_discipline
->owner
);
3468 device
->base_discipline
= NULL
;
3471 EXPORT_SYMBOL_GPL(dasd_generic_free_discipline
);
3474 * This will one day be called from a global not_oper handler.
3475 * It is also used by driver_unregister during module unload.
3477 void dasd_generic_remove(struct ccw_device
*cdev
)
3479 struct dasd_device
*device
;
3480 struct dasd_block
*block
;
3482 cdev
->handler
= NULL
;
3484 device
= dasd_device_from_cdev(cdev
);
3485 if (IS_ERR(device
)) {
3486 dasd_remove_sysfs_files(cdev
);
3489 if (test_and_set_bit(DASD_FLAG_OFFLINE
, &device
->flags
) &&
3490 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
3491 /* Already doing offline processing */
3492 dasd_put_device(device
);
3493 dasd_remove_sysfs_files(cdev
);
3497 * This device is removed unconditionally. Set offline
3498 * flag to prevent dasd_open from opening it while it is
3499 * no quite down yet.
3501 dasd_set_target_state(device
, DASD_STATE_NEW
);
3502 /* dasd_delete_device destroys the device reference. */
3503 block
= device
->block
;
3504 dasd_delete_device(device
);
3506 * life cycle of block is bound to device, so delete it after
3507 * device was safely removed
3510 dasd_free_block(block
);
3512 dasd_remove_sysfs_files(cdev
);
3514 EXPORT_SYMBOL_GPL(dasd_generic_remove
);
3517 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
3518 * the device is detected for the first time and is supposed to be used
3519 * or the user has started activation through sysfs.
3521 int dasd_generic_set_online(struct ccw_device
*cdev
,
3522 struct dasd_discipline
*base_discipline
)
3524 struct dasd_discipline
*discipline
;
3525 struct dasd_device
*device
;
3528 /* first online clears initial online feature flag */
3529 dasd_set_feature(cdev
, DASD_FEATURE_INITIAL_ONLINE
, 0);
3530 device
= dasd_create_device(cdev
);
3532 return PTR_ERR(device
);
3534 discipline
= base_discipline
;
3535 if (device
->features
& DASD_FEATURE_USEDIAG
) {
3536 if (!dasd_diag_discipline_pointer
) {
3537 /* Try to load the required module. */
3538 rc
= request_module(DASD_DIAG_MOD
);
3540 pr_warn("%s Setting the DASD online failed "
3541 "because the required module %s "
3542 "could not be loaded (rc=%d)\n",
3543 dev_name(&cdev
->dev
), DASD_DIAG_MOD
,
3545 dasd_delete_device(device
);
3549 /* Module init could have failed, so check again here after
3550 * request_module(). */
3551 if (!dasd_diag_discipline_pointer
) {
3552 pr_warn("%s Setting the DASD online failed because of missing DIAG discipline\n",
3553 dev_name(&cdev
->dev
));
3554 dasd_delete_device(device
);
3557 discipline
= dasd_diag_discipline_pointer
;
3559 if (!try_module_get(base_discipline
->owner
)) {
3560 dasd_delete_device(device
);
3563 if (!try_module_get(discipline
->owner
)) {
3564 module_put(base_discipline
->owner
);
3565 dasd_delete_device(device
);
3568 device
->base_discipline
= base_discipline
;
3569 device
->discipline
= discipline
;
3571 /* check_device will allocate block device if necessary */
3572 rc
= discipline
->check_device(device
);
3574 pr_warn("%s Setting the DASD online with discipline %s failed with rc=%i\n",
3575 dev_name(&cdev
->dev
), discipline
->name
, rc
);
3576 module_put(discipline
->owner
);
3577 module_put(base_discipline
->owner
);
3578 dasd_delete_device(device
);
3582 dasd_set_target_state(device
, DASD_STATE_ONLINE
);
3583 if (device
->state
<= DASD_STATE_KNOWN
) {
3584 pr_warn("%s Setting the DASD online failed because of a missing discipline\n",
3585 dev_name(&cdev
->dev
));
3587 dasd_set_target_state(device
, DASD_STATE_NEW
);
3589 dasd_free_block(device
->block
);
3590 dasd_delete_device(device
);
3592 pr_debug("dasd_generic device %s found\n",
3593 dev_name(&cdev
->dev
));
3595 wait_event(dasd_init_waitq
, _wait_for_device(device
));
3597 dasd_put_device(device
);
3600 EXPORT_SYMBOL_GPL(dasd_generic_set_online
);
3602 int dasd_generic_set_offline(struct ccw_device
*cdev
)
3604 struct dasd_device
*device
;
3605 struct dasd_block
*block
;
3606 int max_count
, open_count
, rc
;
3607 unsigned long flags
;
3610 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
3611 device
= dasd_device_from_cdev_locked(cdev
);
3612 if (IS_ERR(device
)) {
3613 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
3614 return PTR_ERR(device
);
3618 * We must make sure that this device is currently not in use.
3619 * The open_count is increased for every opener, that includes
3620 * the blkdev_get in dasd_scan_partitions. We are only interested
3621 * in the other openers.
3623 if (device
->block
) {
3624 max_count
= device
->block
->bdev
? 0 : -1;
3625 open_count
= atomic_read(&device
->block
->open_count
);
3626 if (open_count
> max_count
) {
3628 pr_warn("%s: The DASD cannot be set offline with open count %i\n",
3629 dev_name(&cdev
->dev
), open_count
);
3631 pr_warn("%s: The DASD cannot be set offline while it is in use\n",
3632 dev_name(&cdev
->dev
));
3639 * Test if the offline processing is already running and exit if so.
3640 * If a safe offline is being processed this could only be a normal
3641 * offline that should be able to overtake the safe offline and
3642 * cancel any I/O we do not want to wait for any longer
3644 if (test_bit(DASD_FLAG_OFFLINE
, &device
->flags
)) {
3645 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
3646 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
,
3653 set_bit(DASD_FLAG_OFFLINE
, &device
->flags
);
3656 * if safe_offline is called set safe_offline_running flag and
3657 * clear safe_offline so that a call to normal offline
3658 * can overrun safe_offline processing
3660 if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE
, &device
->flags
) &&
3661 !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
3662 /* need to unlock here to wait for outstanding I/O */
3663 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
3665 * If we want to set the device safe offline all IO operations
3666 * should be finished before continuing the offline process
3667 * so sync bdev first and then wait for our queues to become
3670 if (device
->block
) {
3671 rc
= fsync_bdev(device
->block
->bdev
);
3675 dasd_schedule_device_bh(device
);
3676 rc
= wait_event_interruptible(shutdown_waitq
,
3677 _wait_for_empty_queues(device
));
3682 * check if a normal offline process overtook the offline
3683 * processing in this case simply do nothing beside returning
3684 * that we got interrupted
3685 * otherwise mark safe offline as not running any longer and
3686 * continue with normal offline
3688 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
3689 if (!test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
)) {
3693 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
);
3695 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
3697 dasd_set_target_state(device
, DASD_STATE_NEW
);
3698 /* dasd_delete_device destroys the device reference. */
3699 block
= device
->block
;
3700 dasd_delete_device(device
);
3702 * life cycle of block is bound to device, so delete it after
3703 * device was safely removed
3706 dasd_free_block(block
);
3711 /* interrupted by signal */
3712 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
3713 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING
, &device
->flags
);
3714 clear_bit(DASD_FLAG_OFFLINE
, &device
->flags
);
3716 dasd_put_device(device
);
3717 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
3720 EXPORT_SYMBOL_GPL(dasd_generic_set_offline
);
3722 int dasd_generic_last_path_gone(struct dasd_device
*device
)
3724 struct dasd_ccw_req
*cqr
;
3726 dev_warn(&device
->cdev
->dev
, "No operational channel path is left "
3727 "for the device\n");
3728 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s", "last path gone");
3729 /* First of all call extended error reporting. */
3730 dasd_eer_write(device
, NULL
, DASD_EER_NOPATH
);
3732 if (device
->state
< DASD_STATE_BASIC
)
3734 /* Device is active. We want to keep it. */
3735 list_for_each_entry(cqr
, &device
->ccw_queue
, devlist
)
3736 if ((cqr
->status
== DASD_CQR_IN_IO
) ||
3737 (cqr
->status
== DASD_CQR_CLEAR_PENDING
)) {
3738 cqr
->status
= DASD_CQR_QUEUED
;
3741 dasd_device_set_stop_bits(device
, DASD_STOPPED_DC_WAIT
);
3742 dasd_device_clear_timer(device
);
3743 dasd_schedule_device_bh(device
);
3746 EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone
);
3748 int dasd_generic_path_operational(struct dasd_device
*device
)
3750 dev_info(&device
->cdev
->dev
, "A channel path to the device has become "
3752 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s", "path operational");
3753 dasd_device_remove_stop_bits(device
, DASD_STOPPED_DC_WAIT
);
3754 if (device
->stopped
& DASD_UNRESUMED_PM
) {
3755 dasd_device_remove_stop_bits(device
, DASD_UNRESUMED_PM
);
3756 dasd_restore_device(device
);
3759 dasd_schedule_device_bh(device
);
3760 if (device
->block
) {
3761 dasd_schedule_block_bh(device
->block
);
3762 blk_mq_run_hw_queues(device
->block
->request_queue
, true);
3765 if (!device
->stopped
)
3766 wake_up(&generic_waitq
);
3770 EXPORT_SYMBOL_GPL(dasd_generic_path_operational
);
3772 int dasd_generic_notify(struct ccw_device
*cdev
, int event
)
3774 struct dasd_device
*device
;
3777 device
= dasd_device_from_cdev_locked(cdev
);
3785 dasd_path_no_path(device
);
3786 ret
= dasd_generic_last_path_gone(device
);
3790 if (dasd_path_get_opm(device
))
3791 ret
= dasd_generic_path_operational(device
);
3794 dasd_put_device(device
);
3797 EXPORT_SYMBOL_GPL(dasd_generic_notify
);
3799 void dasd_generic_path_event(struct ccw_device
*cdev
, int *path_event
)
3801 struct dasd_device
*device
;
3802 int chp
, oldopm
, hpfpm
, ifccpm
;
3804 device
= dasd_device_from_cdev_locked(cdev
);
3808 oldopm
= dasd_path_get_opm(device
);
3809 for (chp
= 0; chp
< 8; chp
++) {
3810 if (path_event
[chp
] & PE_PATH_GONE
) {
3811 dasd_path_notoper(device
, chp
);
3813 if (path_event
[chp
] & PE_PATH_AVAILABLE
) {
3814 dasd_path_available(device
, chp
);
3815 dasd_schedule_device_bh(device
);
3817 if (path_event
[chp
] & PE_PATHGROUP_ESTABLISHED
) {
3818 if (!dasd_path_is_operational(device
, chp
) &&
3819 !dasd_path_need_verify(device
, chp
)) {
3821 * we can not establish a pathgroup on an
3822 * unavailable path, so trigger a path
3823 * verification first
3825 dasd_path_available(device
, chp
);
3826 dasd_schedule_device_bh(device
);
3828 DBF_DEV_EVENT(DBF_WARNING
, device
, "%s",
3829 "Pathgroup re-established\n");
3830 if (device
->discipline
->kick_validate
)
3831 device
->discipline
->kick_validate(device
);
3834 hpfpm
= dasd_path_get_hpfpm(device
);
3835 ifccpm
= dasd_path_get_ifccpm(device
);
3836 if (!dasd_path_get_opm(device
) && hpfpm
) {
3838 * device has no operational paths but at least one path is
3839 * disabled due to HPF errors
3840 * disable HPF at all and use the path(s) again
3842 if (device
->discipline
->disable_hpf
)
3843 device
->discipline
->disable_hpf(device
);
3844 dasd_device_set_stop_bits(device
, DASD_STOPPED_NOT_ACC
);
3845 dasd_path_set_tbvpm(device
, hpfpm
);
3846 dasd_schedule_device_bh(device
);
3847 dasd_schedule_requeue(device
);
3848 } else if (!dasd_path_get_opm(device
) && ifccpm
) {
3850 * device has no operational paths but at least one path is
3851 * disabled due to IFCC errors
3852 * trigger path verification on paths with IFCC errors
3854 dasd_path_set_tbvpm(device
, ifccpm
);
3855 dasd_schedule_device_bh(device
);
3857 if (oldopm
&& !dasd_path_get_opm(device
) && !hpfpm
&& !ifccpm
) {
3858 dev_warn(&device
->cdev
->dev
,
3859 "No verified channel paths remain for the device\n");
3860 DBF_DEV_EVENT(DBF_WARNING
, device
,
3861 "%s", "last verified path gone");
3862 dasd_eer_write(device
, NULL
, DASD_EER_NOPATH
);
3863 dasd_device_set_stop_bits(device
,
3864 DASD_STOPPED_DC_WAIT
);
3866 dasd_put_device(device
);
3868 EXPORT_SYMBOL_GPL(dasd_generic_path_event
);
3870 int dasd_generic_verify_path(struct dasd_device
*device
, __u8 lpm
)
3872 if (!dasd_path_get_opm(device
) && lpm
) {
3873 dasd_path_set_opm(device
, lpm
);
3874 dasd_generic_path_operational(device
);
3876 dasd_path_add_opm(device
, lpm
);
3879 EXPORT_SYMBOL_GPL(dasd_generic_verify_path
);
3882 * clear active requests and requeue them to block layer if possible
3884 static int dasd_generic_requeue_all_requests(struct dasd_device
*device
)
3886 struct list_head requeue_queue
;
3887 struct dasd_ccw_req
*cqr
, *n
;
3888 struct dasd_ccw_req
*refers
;
3891 INIT_LIST_HEAD(&requeue_queue
);
3892 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
3894 list_for_each_entry_safe(cqr
, n
, &device
->ccw_queue
, devlist
) {
3895 /* Check status and move request to flush_queue */
3896 if (cqr
->status
== DASD_CQR_IN_IO
) {
3897 rc
= device
->discipline
->term_IO(cqr
);
3899 /* unable to terminate requeust */
3900 dev_err(&device
->cdev
->dev
,
3901 "Unable to terminate request %p "
3902 "on suspend\n", cqr
);
3903 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
3904 dasd_put_device(device
);
3908 list_move_tail(&cqr
->devlist
, &requeue_queue
);
3910 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
3912 list_for_each_entry_safe(cqr
, n
, &requeue_queue
, devlist
) {
3913 wait_event(dasd_flush_wq
,
3914 (cqr
->status
!= DASD_CQR_CLEAR_PENDING
));
3916 /* mark sleepon requests as ended */
3917 if (cqr
->callback_data
== DASD_SLEEPON_START_TAG
)
3918 cqr
->callback_data
= DASD_SLEEPON_END_TAG
;
3920 /* remove requests from device and block queue */
3921 list_del_init(&cqr
->devlist
);
3922 while (cqr
->refers
!= NULL
) {
3923 refers
= cqr
->refers
;
3924 /* remove the request from the block queue */
3925 list_del(&cqr
->blocklist
);
3926 /* free the finished erp request */
3927 dasd_free_erp_request(cqr
, cqr
->memdev
);
3932 * requeue requests to blocklayer will only work
3933 * for block device requests
3935 if (_dasd_requeue_request(cqr
))
3939 list_del_init(&cqr
->blocklist
);
3940 cqr
->block
->base
->discipline
->free_cp(
3941 cqr
, (struct request
*) cqr
->callback_data
);
3945 * if requests remain then they are internal request
3946 * and go back to the device queue
3948 if (!list_empty(&requeue_queue
)) {
3949 /* move freeze_queue to start of the ccw_queue */
3950 spin_lock_irq(get_ccwdev_lock(device
->cdev
));
3951 list_splice_tail(&requeue_queue
, &device
->ccw_queue
);
3952 spin_unlock_irq(get_ccwdev_lock(device
->cdev
));
3954 /* wake up generic waitqueue for eventually ended sleepon requests */
3955 wake_up(&generic_waitq
);
3959 static void do_requeue_requests(struct work_struct
*work
)
3961 struct dasd_device
*device
= container_of(work
, struct dasd_device
,
3963 dasd_generic_requeue_all_requests(device
);
3964 dasd_device_remove_stop_bits(device
, DASD_STOPPED_NOT_ACC
);
3966 dasd_schedule_block_bh(device
->block
);
3967 dasd_put_device(device
);
3970 void dasd_schedule_requeue(struct dasd_device
*device
)
3972 dasd_get_device(device
);
3973 /* queue call to dasd_reload_device to the kernel event daemon. */
3974 if (!schedule_work(&device
->requeue_requests
))
3975 dasd_put_device(device
);
3977 EXPORT_SYMBOL(dasd_schedule_requeue
);
3979 int dasd_generic_pm_freeze(struct ccw_device
*cdev
)
3981 struct dasd_device
*device
= dasd_device_from_cdev(cdev
);
3984 return PTR_ERR(device
);
3986 /* mark device as suspended */
3987 set_bit(DASD_FLAG_SUSPENDED
, &device
->flags
);
3989 if (device
->discipline
->freeze
)
3990 device
->discipline
->freeze(device
);
3992 /* disallow new I/O */
3993 dasd_device_set_stop_bits(device
, DASD_STOPPED_PM
);
3995 return dasd_generic_requeue_all_requests(device
);
3997 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze
);
3999 int dasd_generic_restore_device(struct ccw_device
*cdev
)
4001 struct dasd_device
*device
= dasd_device_from_cdev(cdev
);
4005 return PTR_ERR(device
);
4007 /* allow new IO again */
4008 dasd_device_remove_stop_bits(device
,
4009 (DASD_STOPPED_PM
| DASD_UNRESUMED_PM
));
4011 dasd_schedule_device_bh(device
);
4014 * call discipline restore function
4015 * if device is stopped do nothing e.g. for disconnected devices
4017 if (device
->discipline
->restore
&& !(device
->stopped
))
4018 rc
= device
->discipline
->restore(device
);
4019 if (rc
|| device
->stopped
)
4021 * if the resume failed for the DASD we put it in
4022 * an UNRESUMED stop state
4024 device
->stopped
|= DASD_UNRESUMED_PM
;
4026 if (device
->block
) {
4027 dasd_schedule_block_bh(device
->block
);
4028 blk_mq_run_hw_queues(device
->block
->request_queue
, true);
4031 clear_bit(DASD_FLAG_SUSPENDED
, &device
->flags
);
4032 dasd_put_device(device
);
4035 EXPORT_SYMBOL_GPL(dasd_generic_restore_device
);
4037 static struct dasd_ccw_req
*dasd_generic_build_rdc(struct dasd_device
*device
,
4039 int rdc_buffer_size
,
4042 struct dasd_ccw_req
*cqr
;
4044 unsigned long *idaw
;
4046 cqr
= dasd_smalloc_request(magic
, 1 /* RDC */, rdc_buffer_size
, device
);
4049 /* internal error 13 - Allocating the RDC request failed*/
4050 dev_err(&device
->cdev
->dev
,
4051 "An error occurred in the DASD device driver, "
4052 "reason=%s\n", "13");
4057 ccw
->cmd_code
= CCW_CMD_RDC
;
4058 if (idal_is_needed(rdc_buffer
, rdc_buffer_size
)) {
4059 idaw
= (unsigned long *) (cqr
->data
);
4060 ccw
->cda
= (__u32
)(addr_t
) idaw
;
4061 ccw
->flags
= CCW_FLAG_IDA
;
4062 idaw
= idal_create_words(idaw
, rdc_buffer
, rdc_buffer_size
);
4064 ccw
->cda
= (__u32
)(addr_t
) rdc_buffer
;
4068 ccw
->count
= rdc_buffer_size
;
4069 cqr
->startdev
= device
;
4070 cqr
->memdev
= device
;
4071 cqr
->expires
= 10*HZ
;
4073 cqr
->buildclk
= get_tod_clock();
4074 cqr
->status
= DASD_CQR_FILLED
;
4079 int dasd_generic_read_dev_chars(struct dasd_device
*device
, int magic
,
4080 void *rdc_buffer
, int rdc_buffer_size
)
4083 struct dasd_ccw_req
*cqr
;
4085 cqr
= dasd_generic_build_rdc(device
, rdc_buffer
, rdc_buffer_size
,
4088 return PTR_ERR(cqr
);
4090 ret
= dasd_sleep_on(cqr
);
4091 dasd_sfree_request(cqr
, cqr
->memdev
);
4094 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars
);
4097 * In command mode and transport mode we need to look for sense
4098 * data in different places. The sense data itself is allways
4099 * an array of 32 bytes, so we can unify the sense data access
4102 char *dasd_get_sense(struct irb
*irb
)
4104 struct tsb
*tsb
= NULL
;
4107 if (scsw_is_tm(&irb
->scsw
) && (irb
->scsw
.tm
.fcxs
== 0x01)) {
4108 if (irb
->scsw
.tm
.tcw
)
4109 tsb
= tcw_get_tsb((struct tcw
*)(unsigned long)
4111 if (tsb
&& tsb
->length
== 64 && tsb
->flags
)
4112 switch (tsb
->flags
& 0x07) {
4113 case 1: /* tsa_iostat */
4114 sense
= tsb
->tsa
.iostat
.sense
;
4116 case 2: /* tsa_ddpc */
4117 sense
= tsb
->tsa
.ddpc
.sense
;
4120 /* currently we don't use interrogate data */
4123 } else if (irb
->esw
.esw0
.erw
.cons
) {
4128 EXPORT_SYMBOL_GPL(dasd_get_sense
);
4130 void dasd_generic_shutdown(struct ccw_device
*cdev
)
4132 struct dasd_device
*device
;
4134 device
= dasd_device_from_cdev(cdev
);
4139 dasd_schedule_block_bh(device
->block
);
4141 dasd_schedule_device_bh(device
);
4143 wait_event(shutdown_waitq
, _wait_for_empty_queues(device
));
4145 EXPORT_SYMBOL_GPL(dasd_generic_shutdown
);
4147 static int __init
dasd_init(void)
4151 init_waitqueue_head(&dasd_init_waitq
);
4152 init_waitqueue_head(&dasd_flush_wq
);
4153 init_waitqueue_head(&generic_waitq
);
4154 init_waitqueue_head(&shutdown_waitq
);
4156 /* register 'common' DASD debug area, used for all DBF_XXX calls */
4157 dasd_debug_area
= debug_register("dasd", 1, 1, 8 * sizeof(long));
4158 if (dasd_debug_area
== NULL
) {
4162 debug_register_view(dasd_debug_area
, &debug_sprintf_view
);
4163 debug_set_level(dasd_debug_area
, DBF_WARNING
);
4165 DBF_EVENT(DBF_EMERG
, "%s", "debug area created");
4167 dasd_diag_discipline_pointer
= NULL
;
4169 dasd_statistics_createroot();
4171 rc
= dasd_devmap_init();
4174 rc
= dasd_gendisk_init();
4180 rc
= dasd_eer_init();
4183 #ifdef CONFIG_PROC_FS
4184 rc
= dasd_proc_init();
4191 pr_info("The DASD device driver could not be initialized\n");
4196 module_init(dasd_init
);
4197 module_exit(dasd_exit
);