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[pohmelfs.git] / drivers / s390 / block / dasd.c
blob110137e7ec81caae83eee0d914f61b73e38c746a
1 /*
2 * File...........: linux/drivers/s390/block/dasd.c
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * Copyright IBM Corp. 1999, 2009
9 */
10
11 #define KMSG_COMPONENT "dasd"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13
14 #include <linux/kmod.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/ctype.h>
18 #include <linux/major.h>
19 #include <linux/slab.h>
20 #include <linux/hdreg.h>
21 #include <linux/async.h>
22 #include <linux/mutex.h>
23 #include <linux/debugfs.h>
24 #include <linux/seq_file.h>
25 #include <linux/vmalloc.h>
26
27 #include <asm/ccwdev.h>
28 #include <asm/ebcdic.h>
29 #include <asm/idals.h>
30 #include <asm/itcw.h>
31 #include <asm/diag.h>
32
33 /* This is ugly... */
34 #define PRINTK_HEADER "dasd:"
35
36 #include "dasd_int.h"
37 /*
38 * SECTION: Constant definitions to be used within this file
39 */
40 #define DASD_CHANQ_MAX_SIZE 4
41
42 #define DASD_SLEEPON_START_TAG (void *) 1
43 #define DASD_SLEEPON_END_TAG (void *) 2
44
45 /*
46 * SECTION: exported variables of dasd.c
47 */
48 debug_info_t *dasd_debug_area;
49 static struct dentry *dasd_debugfs_root_entry;
50 struct dasd_discipline *dasd_diag_discipline_pointer;
51 void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
52
53 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
54 MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
55 " Copyright 2000 IBM Corporation");
56 MODULE_SUPPORTED_DEVICE("dasd");
57 MODULE_LICENSE("GPL");
58
59 /*
60 * SECTION: prototypes for static functions of dasd.c
61 */
62 static int dasd_alloc_queue(struct dasd_block *);
63 static void dasd_setup_queue(struct dasd_block *);
64 static void dasd_free_queue(struct dasd_block *);
65 static void dasd_flush_request_queue(struct dasd_block *);
66 static int dasd_flush_block_queue(struct dasd_block *);
67 static void dasd_device_tasklet(struct dasd_device *);
68 static void dasd_block_tasklet(struct dasd_block *);
69 static void do_kick_device(struct work_struct *);
70 static void do_restore_device(struct work_struct *);
71 static void do_reload_device(struct work_struct *);
72 static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
73 static void dasd_device_timeout(unsigned long);
74 static void dasd_block_timeout(unsigned long);
75 static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *);
76 static void dasd_profile_init(struct dasd_profile *, struct dentry *);
77 static void dasd_profile_exit(struct dasd_profile *);
78
79 /*
80 * SECTION: Operations on the device structure.
81 */
82 static wait_queue_head_t dasd_init_waitq;
83 static wait_queue_head_t dasd_flush_wq;
84 static wait_queue_head_t generic_waitq;
85
86 /*
87 * Allocate memory for a new device structure.
88 */
89 struct dasd_device *dasd_alloc_device(void)
90 {
91 struct dasd_device *device;
92
93 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC);
94 if (!device)
95 return ERR_PTR(-ENOMEM);
96
97 /* Get two pages for normal block device operations. */
98 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
99 if (!device->ccw_mem) {
100 kfree(device);
101 return ERR_PTR(-ENOMEM);
102 }
103 /* Get one page for error recovery. */
104 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
105 if (!device->erp_mem) {
106 free_pages((unsigned long) device->ccw_mem, 1);
107 kfree(device);
108 return ERR_PTR(-ENOMEM);
109 }
110
111 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
112 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
113 spin_lock_init(&device->mem_lock);
114 atomic_set(&device->tasklet_scheduled, 0);
115 tasklet_init(&device->tasklet,
116 (void (*)(unsigned long)) dasd_device_tasklet,
117 (unsigned long) device);
118 INIT_LIST_HEAD(&device->ccw_queue);
119 init_timer(&device->timer);
120 device->timer.function = dasd_device_timeout;
121 device->timer.data = (unsigned long) device;
122 INIT_WORK(&device->kick_work, do_kick_device);
123 INIT_WORK(&device->restore_device, do_restore_device);
124 INIT_WORK(&device->reload_device, do_reload_device);
125 device->state = DASD_STATE_NEW;
126 device->target = DASD_STATE_NEW;
127 mutex_init(&device->state_mutex);
128 spin_lock_init(&device->profile.lock);
129 return device;
130 }
131
132 /*
133 * Free memory of a device structure.
134 */
135 void dasd_free_device(struct dasd_device *device)
136 {
137 kfree(device->private);
138 free_page((unsigned long) device->erp_mem);
139 free_pages((unsigned long) device->ccw_mem, 1);
140 kfree(device);
141 }
142
143 /*
144 * Allocate memory for a new device structure.
145 */
146 struct dasd_block *dasd_alloc_block(void)
147 {
148 struct dasd_block *block;
149
150 block = kzalloc(sizeof(*block), GFP_ATOMIC);
151 if (!block)
152 return ERR_PTR(-ENOMEM);
153 /* open_count = 0 means device online but not in use */
154 atomic_set(&block->open_count, -1);
155
156 spin_lock_init(&block->request_queue_lock);
157 atomic_set(&block->tasklet_scheduled, 0);
158 tasklet_init(&block->tasklet,
159 (void (*)(unsigned long)) dasd_block_tasklet,
160 (unsigned long) block);
161 INIT_LIST_HEAD(&block->ccw_queue);
162 spin_lock_init(&block->queue_lock);
163 init_timer(&block->timer);
164 block->timer.function = dasd_block_timeout;
165 block->timer.data = (unsigned long) block;
166 spin_lock_init(&block->profile.lock);
167
168 return block;
169 }
170
171 /*
172 * Free memory of a device structure.
173 */
174 void dasd_free_block(struct dasd_block *block)
175 {
176 kfree(block);
177 }
178
179 /*
180 * Make a new device known to the system.
181 */
182 static int dasd_state_new_to_known(struct dasd_device *device)
183 {
184 int rc;
185
186 /*
187 * As long as the device is not in state DASD_STATE_NEW we want to
188 * keep the reference count > 0.
189 */
190 dasd_get_device(device);
191
192 if (device->block) {
193 rc = dasd_alloc_queue(device->block);
194 if (rc) {
195 dasd_put_device(device);
196 return rc;
197 }
198 }
199 device->state = DASD_STATE_KNOWN;
200 return 0;
201 }
202
203 /*
204 * Let the system forget about a device.
205 */
206 static int dasd_state_known_to_new(struct dasd_device *device)
207 {
208 /* Disable extended error reporting for this device. */
209 dasd_eer_disable(device);
210 /* Forget the discipline information. */
211 if (device->discipline) {
212 if (device->discipline->uncheck_device)
213 device->discipline->uncheck_device(device);
214 module_put(device->discipline->owner);
215 }
216 device->discipline = NULL;
217 if (device->base_discipline)
218 module_put(device->base_discipline->owner);
219 device->base_discipline = NULL;
220 device->state = DASD_STATE_NEW;
221
222 if (device->block)
223 dasd_free_queue(device->block);
224
225 /* Give up reference we took in dasd_state_new_to_known. */
226 dasd_put_device(device);
227 return 0;
228 }
229
230 static struct dentry *dasd_debugfs_setup(const char *name,
231 struct dentry *base_dentry)
232 {
233 struct dentry *pde;
234
235 if (!base_dentry)
236 return NULL;
237 pde = debugfs_create_dir(name, base_dentry);
238 if (!pde || IS_ERR(pde))
239 return NULL;
240 return pde;
241 }
242
243 /*
244 * Request the irq line for the device.
245 */
246 static int dasd_state_known_to_basic(struct dasd_device *device)
247 {
248 struct dasd_block *block = device->block;
249 int rc;
250
251 /* Allocate and register gendisk structure. */
252 if (block) {
253 rc = dasd_gendisk_alloc(block);
254 if (rc)
255 return rc;
256 block->debugfs_dentry =
257 dasd_debugfs_setup(block->gdp->disk_name,
258 dasd_debugfs_root_entry);
259 dasd_profile_init(&block->profile, block->debugfs_dentry);
260 if (dasd_global_profile_level == DASD_PROFILE_ON)
261 dasd_profile_on(&device->block->profile);
262 }
263 device->debugfs_dentry =
264 dasd_debugfs_setup(dev_name(&device->cdev->dev),
265 dasd_debugfs_root_entry);
266 dasd_profile_init(&device->profile, device->debugfs_dentry);
267
268 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
269 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1,
270 8 * sizeof(long));
271 debug_register_view(device->debug_area, &debug_sprintf_view);
272 debug_set_level(device->debug_area, DBF_WARNING);
273 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
274
275 device->state = DASD_STATE_BASIC;
276 return 0;
277 }
278
279 /*
280 * Release the irq line for the device. Terminate any running i/o.
281 */
282 static int dasd_state_basic_to_known(struct dasd_device *device)
283 {
284 int rc;
285 if (device->block) {
286 dasd_profile_exit(&device->block->profile);
287 if (device->block->debugfs_dentry)
288 debugfs_remove(device->block->debugfs_dentry);
289 dasd_gendisk_free(device->block);
290 dasd_block_clear_timer(device->block);
291 }
292 rc = dasd_flush_device_queue(device);
293 if (rc)
294 return rc;
295 dasd_device_clear_timer(device);
296 dasd_profile_exit(&device->profile);
297 if (device->debugfs_dentry)
298 debugfs_remove(device->debugfs_dentry);
299
300 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
301 if (device->debug_area != NULL) {
302 debug_unregister(device->debug_area);
303 device->debug_area = NULL;
304 }
305 device->state = DASD_STATE_KNOWN;
306 return 0;
307 }
308
309 /*
310 * Do the initial analysis. The do_analysis function may return
311 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
312 * until the discipline decides to continue the startup sequence
313 * by calling the function dasd_change_state. The eckd disciplines
314 * uses this to start a ccw that detects the format. The completion
315 * interrupt for this detection ccw uses the kernel event daemon to
316 * trigger the call to dasd_change_state. All this is done in the
317 * discipline code, see dasd_eckd.c.
318 * After the analysis ccw is done (do_analysis returned 0) the block
319 * device is setup.
320 * In case the analysis returns an error, the device setup is stopped
321 * (a fake disk was already added to allow formatting).
322 */
323 static int dasd_state_basic_to_ready(struct dasd_device *device)
324 {
325 int rc;
326 struct dasd_block *block;
327
328 rc = 0;
329 block = device->block;
330 /* make disk known with correct capacity */
331 if (block) {
332 if (block->base->discipline->do_analysis != NULL)
333 rc = block->base->discipline->do_analysis(block);
334 if (rc) {
335 if (rc != -EAGAIN)
336 device->state = DASD_STATE_UNFMT;
337 return rc;
338 }
339 dasd_setup_queue(block);
340 set_capacity(block->gdp,
341 block->blocks << block->s2b_shift);
342 device->state = DASD_STATE_READY;
343 rc = dasd_scan_partitions(block);
344 if (rc)
345 device->state = DASD_STATE_BASIC;
346 } else {
347 device->state = DASD_STATE_READY;
348 }
349 return rc;
350 }
351
352 /*
353 * Remove device from block device layer. Destroy dirty buffers.
354 * Forget format information. Check if the target level is basic
355 * and if it is create fake disk for formatting.
356 */
357 static int dasd_state_ready_to_basic(struct dasd_device *device)
358 {
359 int rc;
360
361 device->state = DASD_STATE_BASIC;
362 if (device->block) {
363 struct dasd_block *block = device->block;
364 rc = dasd_flush_block_queue(block);
365 if (rc) {
366 device->state = DASD_STATE_READY;
367 return rc;
368 }
369 dasd_flush_request_queue(block);
370 dasd_destroy_partitions(block);
371 block->blocks = 0;
372 block->bp_block = 0;
373 block->s2b_shift = 0;
374 }
375 return 0;
376 }
377
378 /*
379 * Back to basic.
380 */
381 static int dasd_state_unfmt_to_basic(struct dasd_device *device)
382 {
383 device->state = DASD_STATE_BASIC;
384 return 0;
385 }
386
387 /*
388 * Make the device online and schedule the bottom half to start
389 * the requeueing of requests from the linux request queue to the
390 * ccw queue.
391 */
392 static int
393 dasd_state_ready_to_online(struct dasd_device * device)
394 {
395 int rc;
396 struct gendisk *disk;
397 struct disk_part_iter piter;
398 struct hd_struct *part;
399
400 if (device->discipline->ready_to_online) {
401 rc = device->discipline->ready_to_online(device);
402 if (rc)
403 return rc;
404 }
405 device->state = DASD_STATE_ONLINE;
406 if (device->block) {
407 dasd_schedule_block_bh(device->block);
408 if ((device->features & DASD_FEATURE_USERAW)) {
409 disk = device->block->gdp;
410 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
411 return 0;
412 }
413 disk = device->block->bdev->bd_disk;
414 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
415 while ((part = disk_part_iter_next(&piter)))
416 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
417 disk_part_iter_exit(&piter);
418 }
419 return 0;
420 }
421
422 /*
423 * Stop the requeueing of requests again.
424 */
425 static int dasd_state_online_to_ready(struct dasd_device *device)
426 {
427 int rc;
428 struct gendisk *disk;
429 struct disk_part_iter piter;
430 struct hd_struct *part;
431
432 if (device->discipline->online_to_ready) {
433 rc = device->discipline->online_to_ready(device);
434 if (rc)
435 return rc;
436 }
437 device->state = DASD_STATE_READY;
438 if (device->block && !(device->features & DASD_FEATURE_USERAW)) {
439 disk = device->block->bdev->bd_disk;
440 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
441 while ((part = disk_part_iter_next(&piter)))
442 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
443 disk_part_iter_exit(&piter);
444 }
445 return 0;
446 }
447
448 /*
449 * Device startup state changes.
450 */
451 static int dasd_increase_state(struct dasd_device *device)
452 {
453 int rc;
454
455 rc = 0;
456 if (device->state == DASD_STATE_NEW &&
457 device->target >= DASD_STATE_KNOWN)
458 rc = dasd_state_new_to_known(device);
459
460 if (!rc &&
461 device->state == DASD_STATE_KNOWN &&
462 device->target >= DASD_STATE_BASIC)
463 rc = dasd_state_known_to_basic(device);
464
465 if (!rc &&
466 device->state == DASD_STATE_BASIC &&
467 device->target >= DASD_STATE_READY)
468 rc = dasd_state_basic_to_ready(device);
469
470 if (!rc &&
471 device->state == DASD_STATE_UNFMT &&
472 device->target > DASD_STATE_UNFMT)
473 rc = -EPERM;
474
475 if (!rc &&
476 device->state == DASD_STATE_READY &&
477 device->target >= DASD_STATE_ONLINE)
478 rc = dasd_state_ready_to_online(device);
479
480 return rc;
481 }
482
483 /*
484 * Device shutdown state changes.
485 */
486 static int dasd_decrease_state(struct dasd_device *device)
487 {
488 int rc;
489
490 rc = 0;
491 if (device->state == DASD_STATE_ONLINE &&
492 device->target <= DASD_STATE_READY)
493 rc = dasd_state_online_to_ready(device);
494
495 if (!rc &&
496 device->state == DASD_STATE_READY &&
497 device->target <= DASD_STATE_BASIC)
498 rc = dasd_state_ready_to_basic(device);
499
500 if (!rc &&
501 device->state == DASD_STATE_UNFMT &&
502 device->target <= DASD_STATE_BASIC)
503 rc = dasd_state_unfmt_to_basic(device);
504
505 if (!rc &&
506 device->state == DASD_STATE_BASIC &&
507 device->target <= DASD_STATE_KNOWN)
508 rc = dasd_state_basic_to_known(device);
509
510 if (!rc &&
511 device->state == DASD_STATE_KNOWN &&
512 device->target <= DASD_STATE_NEW)
513 rc = dasd_state_known_to_new(device);
514
515 return rc;
516 }
517
518 /*
519 * This is the main startup/shutdown routine.
520 */
521 static void dasd_change_state(struct dasd_device *device)
522 {
523 int rc;
524
525 if (device->state == device->target)
526 /* Already where we want to go today... */
527 return;
528 if (device->state < device->target)
529 rc = dasd_increase_state(device);
530 else
531 rc = dasd_decrease_state(device);
532 if (rc == -EAGAIN)
533 return;
534 if (rc)
535 device->target = device->state;
536
537 if (device->state == device->target)
538 wake_up(&dasd_init_waitq);
539
540 /* let user-space know that the device status changed */
541 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
542 }
543
544 /*
545 * Kick starter for devices that did not complete the startup/shutdown
546 * procedure or were sleeping because of a pending state.
547 * dasd_kick_device will schedule a call do do_kick_device to the kernel
548 * event daemon.
549 */
550 static void do_kick_device(struct work_struct *work)
551 {
552 struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
553 mutex_lock(&device->state_mutex);
554 dasd_change_state(device);
555 mutex_unlock(&device->state_mutex);
556 dasd_schedule_device_bh(device);
557 dasd_put_device(device);
558 }
559
560 void dasd_kick_device(struct dasd_device *device)
561 {
562 dasd_get_device(device);
563 /* queue call to dasd_kick_device to the kernel event daemon. */
564 schedule_work(&device->kick_work);
565 }
566
567 /*
568 * dasd_reload_device will schedule a call do do_reload_device to the kernel
569 * event daemon.
570 */
571 static void do_reload_device(struct work_struct *work)
572 {
573 struct dasd_device *device = container_of(work, struct dasd_device,
574 reload_device);
575 device->discipline->reload(device);
576 dasd_put_device(device);
577 }
578
579 void dasd_reload_device(struct dasd_device *device)
580 {
581 dasd_get_device(device);
582 /* queue call to dasd_reload_device to the kernel event daemon. */
583 schedule_work(&device->reload_device);
584 }
585 EXPORT_SYMBOL(dasd_reload_device);
586
587 /*
588 * dasd_restore_device will schedule a call do do_restore_device to the kernel
589 * event daemon.
590 */
591 static void do_restore_device(struct work_struct *work)
592 {
593 struct dasd_device *device = container_of(work, struct dasd_device,
594 restore_device);
595 device->cdev->drv->restore(device->cdev);
596 dasd_put_device(device);
597 }
598
599 void dasd_restore_device(struct dasd_device *device)
600 {
601 dasd_get_device(device);
602 /* queue call to dasd_restore_device to the kernel event daemon. */
603 schedule_work(&device->restore_device);
604 }
605
606 /*
607 * Set the target state for a device and starts the state change.
608 */
609 void dasd_set_target_state(struct dasd_device *device, int target)
610 {
611 dasd_get_device(device);
612 mutex_lock(&device->state_mutex);
613 /* If we are in probeonly mode stop at DASD_STATE_READY. */
614 if (dasd_probeonly && target > DASD_STATE_READY)
615 target = DASD_STATE_READY;
616 if (device->target != target) {
617 if (device->state == target)
618 wake_up(&dasd_init_waitq);
619 device->target = target;
620 }
621 if (device->state != device->target)
622 dasd_change_state(device);
623 mutex_unlock(&device->state_mutex);
624 dasd_put_device(device);
625 }
626
627 /*
628 * Enable devices with device numbers in [from..to].
629 */
630 static inline int _wait_for_device(struct dasd_device *device)
631 {
632 return (device->state == device->target);
633 }
634
635 void dasd_enable_device(struct dasd_device *device)
636 {
637 dasd_set_target_state(device, DASD_STATE_ONLINE);
638 if (device->state <= DASD_STATE_KNOWN)
639 /* No discipline for device found. */
640 dasd_set_target_state(device, DASD_STATE_NEW);
641 /* Now wait for the devices to come up. */
642 wait_event(dasd_init_waitq, _wait_for_device(device));
643 }
644
645 /*
646 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
647 */
648
649 unsigned int dasd_global_profile_level = DASD_PROFILE_OFF;
650
651 #ifdef CONFIG_DASD_PROFILE
652 struct dasd_profile_info dasd_global_profile_data;
653 static struct dentry *dasd_global_profile_dentry;
654 static struct dentry *dasd_debugfs_global_entry;
655
656 /*
657 * Add profiling information for cqr before execution.
658 */
659 static void dasd_profile_start(struct dasd_block *block,
660 struct dasd_ccw_req *cqr,
661 struct request *req)
662 {
663 struct list_head *l;
664 unsigned int counter;
665 struct dasd_device *device;
666
667 /* count the length of the chanq for statistics */
668 counter = 0;
669 if (dasd_global_profile_level || block->profile.data)
670 list_for_each(l, &block->ccw_queue)
671 if (++counter >= 31)
672 break;
673
674 if (dasd_global_profile_level) {
675 dasd_global_profile_data.dasd_io_nr_req[counter]++;
676 if (rq_data_dir(req) == READ)
677 dasd_global_profile_data.dasd_read_nr_req[counter]++;
678 }
679
680 spin_lock(&block->profile.lock);
681 if (block->profile.data)
682 block->profile.data->dasd_io_nr_req[counter]++;
683 if (rq_data_dir(req) == READ)
684 block->profile.data->dasd_read_nr_req[counter]++;
685 spin_unlock(&block->profile.lock);
686
687 /*
688 * We count the request for the start device, even though it may run on
689 * some other device due to error recovery. This way we make sure that
690 * we count each request only once.
691 */
692 device = cqr->startdev;
693 if (device->profile.data) {
694 counter = 1; /* request is not yet queued on the start device */
695 list_for_each(l, &device->ccw_queue)
696 if (++counter >= 31)
697 break;
698 }
699 spin_lock(&device->profile.lock);
700 if (device->profile.data) {
701 device->profile.data->dasd_io_nr_req[counter]++;
702 if (rq_data_dir(req) == READ)
703 device->profile.data->dasd_read_nr_req[counter]++;
704 }
705 spin_unlock(&device->profile.lock);
706 }
707
708 /*
709 * Add profiling information for cqr after execution.
710 */
711
712 #define dasd_profile_counter(value, index) \
713 { \
714 for (index = 0; index < 31 && value >> (2+index); index++) \
715 ; \
716 }
717
718 static void dasd_profile_end_add_data(struct dasd_profile_info *data,
719 int is_alias,
720 int is_tpm,
721 int is_read,
722 long sectors,
723 int sectors_ind,
724 int tottime_ind,
725 int tottimeps_ind,
726 int strtime_ind,
727 int irqtime_ind,
728 int irqtimeps_ind,
729 int endtime_ind)
730 {
731 /* in case of an overflow, reset the whole profile */
732 if (data->dasd_io_reqs == UINT_MAX) {
733 memset(data, 0, sizeof(*data));
734 getnstimeofday(&data->starttod);
735 }
736 data->dasd_io_reqs++;
737 data->dasd_io_sects += sectors;
738 if (is_alias)
739 data->dasd_io_alias++;
740 if (is_tpm)
741 data->dasd_io_tpm++;
742
743 data->dasd_io_secs[sectors_ind]++;
744 data->dasd_io_times[tottime_ind]++;
745 data->dasd_io_timps[tottimeps_ind]++;
746 data->dasd_io_time1[strtime_ind]++;
747 data->dasd_io_time2[irqtime_ind]++;
748 data->dasd_io_time2ps[irqtimeps_ind]++;
749 data->dasd_io_time3[endtime_ind]++;
750
751 if (is_read) {
752 data->dasd_read_reqs++;
753 data->dasd_read_sects += sectors;
754 if (is_alias)
755 data->dasd_read_alias++;
756 if (is_tpm)
757 data->dasd_read_tpm++;
758 data->dasd_read_secs[sectors_ind]++;
759 data->dasd_read_times[tottime_ind]++;
760 data->dasd_read_time1[strtime_ind]++;
761 data->dasd_read_time2[irqtime_ind]++;
762 data->dasd_read_time3[endtime_ind]++;
763 }
764 }
765
766 static void dasd_profile_end(struct dasd_block *block,
767 struct dasd_ccw_req *cqr,
768 struct request *req)
769 {
770 long strtime, irqtime, endtime, tottime; /* in microseconds */
771 long tottimeps, sectors;
772 struct dasd_device *device;
773 int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind;
774 int irqtime_ind, irqtimeps_ind, endtime_ind;
775
776 device = cqr->startdev;
777 if (!(dasd_global_profile_level ||
778 block->profile.data ||
779 device->profile.data))
780 return;
781
782 sectors = blk_rq_sectors(req);
783 if (!cqr->buildclk || !cqr->startclk ||
784 !cqr->stopclk || !cqr->endclk ||
785 !sectors)
786 return;
787
788 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
789 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
790 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
791 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
792 tottimeps = tottime / sectors;
793
794 dasd_profile_counter(sectors, sectors_ind);
795 dasd_profile_counter(tottime, tottime_ind);
796 dasd_profile_counter(tottimeps, tottimeps_ind);
797 dasd_profile_counter(strtime, strtime_ind);
798 dasd_profile_counter(irqtime, irqtime_ind);
799 dasd_profile_counter(irqtime / sectors, irqtimeps_ind);
800 dasd_profile_counter(endtime, endtime_ind);
801
802 if (dasd_global_profile_level) {
803 dasd_profile_end_add_data(&dasd_global_profile_data,
804 cqr->startdev != block->base,
805 cqr->cpmode == 1,
806 rq_data_dir(req) == READ,
807 sectors, sectors_ind, tottime_ind,
808 tottimeps_ind, strtime_ind,
809 irqtime_ind, irqtimeps_ind,
810 endtime_ind);
811 }
812
813 spin_lock(&block->profile.lock);
814 if (block->profile.data)
815 dasd_profile_end_add_data(block->profile.data,
816 cqr->startdev != block->base,
817 cqr->cpmode == 1,
818 rq_data_dir(req) == READ,
819 sectors, sectors_ind, tottime_ind,
820 tottimeps_ind, strtime_ind,
821 irqtime_ind, irqtimeps_ind,
822 endtime_ind);
823 spin_unlock(&block->profile.lock);
824
825 spin_lock(&device->profile.lock);
826 if (device->profile.data)
827 dasd_profile_end_add_data(device->profile.data,
828 cqr->startdev != block->base,
829 cqr->cpmode == 1,
830 rq_data_dir(req) == READ,
831 sectors, sectors_ind, tottime_ind,
832 tottimeps_ind, strtime_ind,
833 irqtime_ind, irqtimeps_ind,
834 endtime_ind);
835 spin_unlock(&device->profile.lock);
836 }
837
838 void dasd_profile_reset(struct dasd_profile *profile)
839 {
840 struct dasd_profile_info *data;
841
842 spin_lock_bh(&profile->lock);
843 data = profile->data;
844 if (!data) {
845 spin_unlock_bh(&profile->lock);
846 return;
847 }
848 memset(data, 0, sizeof(*data));
849 getnstimeofday(&data->starttod);
850 spin_unlock_bh(&profile->lock);
851 }
852
853 void dasd_global_profile_reset(void)
854 {
855 memset(&dasd_global_profile_data, 0, sizeof(dasd_global_profile_data));
856 getnstimeofday(&dasd_global_profile_data.starttod);
857 }
858
859 int dasd_profile_on(struct dasd_profile *profile)
860 {
861 struct dasd_profile_info *data;
862
863 data = kzalloc(sizeof(*data), GFP_KERNEL);
864 if (!data)
865 return -ENOMEM;
866 spin_lock_bh(&profile->lock);
867 if (profile->data) {
868 spin_unlock_bh(&profile->lock);
869 kfree(data);
870 return 0;
871 }
872 getnstimeofday(&data->starttod);
873 profile->data = data;
874 spin_unlock_bh(&profile->lock);
875 return 0;
876 }
877
878 void dasd_profile_off(struct dasd_profile *profile)
879 {
880 spin_lock_bh(&profile->lock);
881 kfree(profile->data);
882 profile->data = NULL;
883 spin_unlock_bh(&profile->lock);
884 }
885
886 char *dasd_get_user_string(const char __user *user_buf, size_t user_len)
887 {
888 char *buffer;
889
890 buffer = vmalloc(user_len + 1);
891 if (buffer == NULL)
892 return ERR_PTR(-ENOMEM);
893 if (copy_from_user(buffer, user_buf, user_len) != 0) {
894 vfree(buffer);
895 return ERR_PTR(-EFAULT);
896 }
897 /* got the string, now strip linefeed. */
898 if (buffer[user_len - 1] == '\n')
899 buffer[user_len - 1] = 0;
900 else
901 buffer[user_len] = 0;
902 return buffer;
903 }
904
905 static ssize_t dasd_stats_write(struct file *file,
906 const char __user *user_buf,
907 size_t user_len, loff_t *pos)
908 {
909 char *buffer, *str;
910 int rc;
911 struct seq_file *m = (struct seq_file *)file->private_data;
912 struct dasd_profile *prof = m->private;
913
914 if (user_len > 65536)
915 user_len = 65536;
916 buffer = dasd_get_user_string(user_buf, user_len);
917 if (IS_ERR(buffer))
918 return PTR_ERR(buffer);
919
920 str = skip_spaces(buffer);
921 rc = user_len;
922 if (strncmp(str, "reset", 5) == 0) {
923 dasd_profile_reset(prof);
924 } else if (strncmp(str, "on", 2) == 0) {
925 rc = dasd_profile_on(prof);
926 if (!rc)
927 rc = user_len;
928 } else if (strncmp(str, "off", 3) == 0) {
929 dasd_profile_off(prof);
930 } else
931 rc = -EINVAL;
932 vfree(buffer);
933 return rc;
934 }
935
936 static void dasd_stats_array(struct seq_file *m, unsigned int *array)
937 {
938 int i;
939
940 for (i = 0; i < 32; i++)
941 seq_printf(m, "%u ", array[i]);
942 seq_putc(m, '\n');
943 }
944
945 static void dasd_stats_seq_print(struct seq_file *m,
946 struct dasd_profile_info *data)
947 {
948 seq_printf(m, "start_time %ld.%09ld\n",
949 data->starttod.tv_sec, data->starttod.tv_nsec);
950 seq_printf(m, "total_requests %u\n", data->dasd_io_reqs);
951 seq_printf(m, "total_sectors %u\n", data->dasd_io_sects);
952 seq_printf(m, "total_pav %u\n", data->dasd_io_alias);
953 seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm);
954 seq_printf(m, "histogram_sectors ");
955 dasd_stats_array(m, data->dasd_io_secs);
956 seq_printf(m, "histogram_io_times ");
957 dasd_stats_array(m, data->dasd_io_times);
958 seq_printf(m, "histogram_io_times_weighted ");
959 dasd_stats_array(m, data->dasd_io_timps);
960 seq_printf(m, "histogram_time_build_to_ssch ");
961 dasd_stats_array(m, data->dasd_io_time1);
962 seq_printf(m, "histogram_time_ssch_to_irq ");
963 dasd_stats_array(m, data->dasd_io_time2);
964 seq_printf(m, "histogram_time_ssch_to_irq_weighted ");
965 dasd_stats_array(m, data->dasd_io_time2ps);
966 seq_printf(m, "histogram_time_irq_to_end ");
967 dasd_stats_array(m, data->dasd_io_time3);
968 seq_printf(m, "histogram_ccw_queue_length ");
969 dasd_stats_array(m, data->dasd_io_nr_req);
970 seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs);
971 seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects);
972 seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias);
973 seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm);
974 seq_printf(m, "histogram_read_sectors ");
975 dasd_stats_array(m, data->dasd_read_secs);
976 seq_printf(m, "histogram_read_times ");
977 dasd_stats_array(m, data->dasd_read_times);
978 seq_printf(m, "histogram_read_time_build_to_ssch ");
979 dasd_stats_array(m, data->dasd_read_time1);
980 seq_printf(m, "histogram_read_time_ssch_to_irq ");
981 dasd_stats_array(m, data->dasd_read_time2);
982 seq_printf(m, "histogram_read_time_irq_to_end ");
983 dasd_stats_array(m, data->dasd_read_time3);
984 seq_printf(m, "histogram_read_ccw_queue_length ");
985 dasd_stats_array(m, data->dasd_read_nr_req);
986 }
987
988 static int dasd_stats_show(struct seq_file *m, void *v)
989 {
990 struct dasd_profile *profile;
991 struct dasd_profile_info *data;
992
993 profile = m->private;
994 spin_lock_bh(&profile->lock);
995 data = profile->data;
996 if (!data) {
997 spin_unlock_bh(&profile->lock);
998 seq_printf(m, "disabled\n");
999 return 0;
1000 }
1001 dasd_stats_seq_print(m, data);
1002 spin_unlock_bh(&profile->lock);
1003 return 0;
1004 }
1005
1006 static int dasd_stats_open(struct inode *inode, struct file *file)
1007 {
1008 struct dasd_profile *profile = inode->i_private;
1009 return single_open(file, dasd_stats_show, profile);
1010 }
1011
1012 static const struct file_operations dasd_stats_raw_fops = {
1013 .owner = THIS_MODULE,
1014 .open = dasd_stats_open,
1015 .read = seq_read,
1016 .llseek = seq_lseek,
1017 .release = single_release,
1018 .write = dasd_stats_write,
1019 };
1020
1021 static ssize_t dasd_stats_global_write(struct file *file,
1022 const char __user *user_buf,
1023 size_t user_len, loff_t *pos)
1024 {
1025 char *buffer, *str;
1026 ssize_t rc;
1027
1028 if (user_len > 65536)
1029 user_len = 65536;
1030 buffer = dasd_get_user_string(user_buf, user_len);
1031 if (IS_ERR(buffer))
1032 return PTR_ERR(buffer);
1033 str = skip_spaces(buffer);
1034 rc = user_len;
1035 if (strncmp(str, "reset", 5) == 0) {
1036 dasd_global_profile_reset();
1037 } else if (strncmp(str, "on", 2) == 0) {
1038 dasd_global_profile_reset();
1039 dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY;
1040 } else if (strncmp(str, "off", 3) == 0) {
1041 dasd_global_profile_level = DASD_PROFILE_OFF;
1042 } else
1043 rc = -EINVAL;
1044 vfree(buffer);
1045 return rc;
1046 }
1047
1048 static int dasd_stats_global_show(struct seq_file *m, void *v)
1049 {
1050 if (!dasd_global_profile_level) {
1051 seq_printf(m, "disabled\n");
1052 return 0;
1053 }
1054 dasd_stats_seq_print(m, &dasd_global_profile_data);
1055 return 0;
1056 }
1057
1058 static int dasd_stats_global_open(struct inode *inode, struct file *file)
1059 {
1060 return single_open(file, dasd_stats_global_show, NULL);
1061 }
1062
1063 static const struct file_operations dasd_stats_global_fops = {
1064 .owner = THIS_MODULE,
1065 .open = dasd_stats_global_open,
1066 .read = seq_read,
1067 .llseek = seq_lseek,
1068 .release = single_release,
1069 .write = dasd_stats_global_write,
1070 };
1071
1072 static void dasd_profile_init(struct dasd_profile *profile,
1073 struct dentry *base_dentry)
1074 {
1075 umode_t mode;
1076 struct dentry *pde;
1077
1078 if (!base_dentry)
1079 return;
1080 profile->dentry = NULL;
1081 profile->data = NULL;
1082 mode = (S_IRUSR | S_IWUSR | S_IFREG);
1083 pde = debugfs_create_file("statistics", mode, base_dentry,
1084 profile, &dasd_stats_raw_fops);
1085 if (pde && !IS_ERR(pde))
1086 profile->dentry = pde;
1087 return;
1088 }
1089
1090 static void dasd_profile_exit(struct dasd_profile *profile)
1091 {
1092 dasd_profile_off(profile);
1093 if (profile->dentry) {
1094 debugfs_remove(profile->dentry);
1095 profile->dentry = NULL;
1096 }
1097 }
1098
1099 static void dasd_statistics_removeroot(void)
1100 {
1101 dasd_global_profile_level = DASD_PROFILE_OFF;
1102 if (dasd_global_profile_dentry) {
1103 debugfs_remove(dasd_global_profile_dentry);
1104 dasd_global_profile_dentry = NULL;
1105 }
1106 if (dasd_debugfs_global_entry)
1107 debugfs_remove(dasd_debugfs_global_entry);
1108 if (dasd_debugfs_root_entry)
1109 debugfs_remove(dasd_debugfs_root_entry);
1110 }
1111
1112 static void dasd_statistics_createroot(void)
1113 {
1114 umode_t mode;
1115 struct dentry *pde;
1116
1117 dasd_debugfs_root_entry = NULL;
1118 dasd_debugfs_global_entry = NULL;
1119 dasd_global_profile_dentry = NULL;
1120 pde = debugfs_create_dir("dasd", NULL);
1121 if (!pde || IS_ERR(pde))
1122 goto error;
1123 dasd_debugfs_root_entry = pde;
1124 pde = debugfs_create_dir("global", dasd_debugfs_root_entry);
1125 if (!pde || IS_ERR(pde))
1126 goto error;
1127 dasd_debugfs_global_entry = pde;
1128
1129 mode = (S_IRUSR | S_IWUSR | S_IFREG);
1130 pde = debugfs_create_file("statistics", mode, dasd_debugfs_global_entry,
1131 NULL, &dasd_stats_global_fops);
1132 if (!pde || IS_ERR(pde))
1133 goto error;
1134 dasd_global_profile_dentry = pde;
1135 return;
1136
1137 error:
1138 DBF_EVENT(DBF_ERR, "%s",
1139 "Creation of the dasd debugfs interface failed");
1140 dasd_statistics_removeroot();
1141 return;
1142 }
1143
1144 #else
1145 #define dasd_profile_start(block, cqr, req) do {} while (0)
1146 #define dasd_profile_end(block, cqr, req) do {} while (0)
1147
1148 static void dasd_statistics_createroot(void)
1149 {
1150 return;
1151 }
1152
1153 static void dasd_statistics_removeroot(void)
1154 {
1155 return;
1156 }
1157
1158 int dasd_stats_generic_show(struct seq_file *m, void *v)
1159 {
1160 seq_printf(m, "Statistics are not activated in this kernel\n");
1161 return 0;
1162 }
1163
1164 static void dasd_profile_init(struct dasd_profile *profile,
1165 struct dentry *base_dentry)
1166 {
1167 return;
1168 }
1169
1170 static void dasd_profile_exit(struct dasd_profile *profile)
1171 {
1172 return;
1173 }
1174
1175 int dasd_profile_on(struct dasd_profile *profile)
1176 {
1177 return 0;
1178 }
1179
1180 #endif /* CONFIG_DASD_PROFILE */
1181
1182 /*
1183 * Allocate memory for a channel program with 'cplength' channel
1184 * command words and 'datasize' additional space. There are two
1185 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
1186 * memory and 2) dasd_smalloc_request uses the static ccw memory
1187 * that gets allocated for each device.
1188 */
1189 struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
1190 int datasize,
1191 struct dasd_device *device)
1192 {
1193 struct dasd_ccw_req *cqr;
1194
1195 /* Sanity checks */
1196 BUG_ON(datasize > PAGE_SIZE ||
1197 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
1198
1199 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
1200 if (cqr == NULL)
1201 return ERR_PTR(-ENOMEM);
1202 cqr->cpaddr = NULL;
1203 if (cplength > 0) {
1204 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
1205 GFP_ATOMIC | GFP_DMA);
1206 if (cqr->cpaddr == NULL) {
1207 kfree(cqr);
1208 return ERR_PTR(-ENOMEM);
1209 }
1210 }
1211 cqr->data = NULL;
1212 if (datasize > 0) {
1213 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
1214 if (cqr->data == NULL) {
1215 kfree(cqr->cpaddr);
1216 kfree(cqr);
1217 return ERR_PTR(-ENOMEM);
1218 }
1219 }
1220 cqr->magic = magic;
1221 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1222 dasd_get_device(device);
1223 return cqr;
1224 }
1225
1226 struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
1227 int datasize,
1228 struct dasd_device *device)
1229 {
1230 unsigned long flags;
1231 struct dasd_ccw_req *cqr;
1232 char *data;
1233 int size;
1234
1235 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
1236 if (cplength > 0)
1237 size += cplength * sizeof(struct ccw1);
1238 if (datasize > 0)
1239 size += datasize;
1240 spin_lock_irqsave(&device->mem_lock, flags);
1241 cqr = (struct dasd_ccw_req *)
1242 dasd_alloc_chunk(&device->ccw_chunks, size);
1243 spin_unlock_irqrestore(&device->mem_lock, flags);
1244 if (cqr == NULL)
1245 return ERR_PTR(-ENOMEM);
1246 memset(cqr, 0, sizeof(struct dasd_ccw_req));
1247 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
1248 cqr->cpaddr = NULL;
1249 if (cplength > 0) {
1250 cqr->cpaddr = (struct ccw1 *) data;
1251 data += cplength*sizeof(struct ccw1);
1252 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
1253 }
1254 cqr->data = NULL;
1255 if (datasize > 0) {
1256 cqr->data = data;
1257 memset(cqr->data, 0, datasize);
1258 }
1259 cqr->magic = magic;
1260 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1261 dasd_get_device(device);
1262 return cqr;
1263 }
1264
1265 /*
1266 * Free memory of a channel program. This function needs to free all the
1267 * idal lists that might have been created by dasd_set_cda and the
1268 * struct dasd_ccw_req itself.
1269 */
1270 void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1271 {
1272 #ifdef CONFIG_64BIT
1273 struct ccw1 *ccw;
1274
1275 /* Clear any idals used for the request. */
1276 ccw = cqr->cpaddr;
1277 do {
1278 clear_normalized_cda(ccw);
1279 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
1280 #endif
1281 kfree(cqr->cpaddr);
1282 kfree(cqr->data);
1283 kfree(cqr);
1284 dasd_put_device(device);
1285 }
1286
1287 void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1288 {
1289 unsigned long flags;
1290
1291 spin_lock_irqsave(&device->mem_lock, flags);
1292 dasd_free_chunk(&device->ccw_chunks, cqr);
1293 spin_unlock_irqrestore(&device->mem_lock, flags);
1294 dasd_put_device(device);
1295 }
1296
1297 /*
1298 * Check discipline magic in cqr.
1299 */
1300 static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
1301 {
1302 struct dasd_device *device;
1303
1304 if (cqr == NULL)
1305 return -EINVAL;
1306 device = cqr->startdev;
1307 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
1308 DBF_DEV_EVENT(DBF_WARNING, device,
1309 " dasd_ccw_req 0x%08x magic doesn't match"
1310 " discipline 0x%08x",
1311 cqr->magic,
1312 *(unsigned int *) device->discipline->name);
1313 return -EINVAL;
1314 }
1315 return 0;
1316 }
1317
1318 /*
1319 * Terminate the current i/o and set the request to clear_pending.
1320 * Timer keeps device runnig.
1321 * ccw_device_clear can fail if the i/o subsystem
1322 * is in a bad mood.
1323 */
1324 int dasd_term_IO(struct dasd_ccw_req *cqr)
1325 {
1326 struct dasd_device *device;
1327 int retries, rc;
1328 char errorstring[ERRORLENGTH];
1329
1330 /* Check the cqr */
1331 rc = dasd_check_cqr(cqr);
1332 if (rc)
1333 return rc;
1334 retries = 0;
1335 device = (struct dasd_device *) cqr->startdev;
1336 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
1337 rc = ccw_device_clear(device->cdev, (long) cqr);
1338 switch (rc) {
1339 case 0: /* termination successful */
1340 cqr->status = DASD_CQR_CLEAR_PENDING;
1341 cqr->stopclk = get_clock();
1342 cqr->starttime = 0;
1343 DBF_DEV_EVENT(DBF_DEBUG, device,
1344 "terminate cqr %p successful",
1345 cqr);
1346 break;
1347 case -ENODEV:
1348 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1349 "device gone, retry");
1350 break;
1351 case -EIO:
1352 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1353 "I/O error, retry");
1354 break;
1355 case -EINVAL:
1356 case -EBUSY:
1357 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1358 "device busy, retry later");
1359 break;
1360 default:
1361 /* internal error 10 - unknown rc*/
1362 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
1363 dev_err(&device->cdev->dev, "An error occurred in the "
1364 "DASD device driver, reason=%s\n", errorstring);
1365 BUG();
1366 break;
1367 }
1368 retries++;
1369 }
1370 dasd_schedule_device_bh(device);
1371 return rc;
1372 }
1373
1374 /*
1375 * Start the i/o. This start_IO can fail if the channel is really busy.
1376 * In that case set up a timer to start the request later.
1377 */
1378 int dasd_start_IO(struct dasd_ccw_req *cqr)
1379 {
1380 struct dasd_device *device;
1381 int rc;
1382 char errorstring[ERRORLENGTH];
1383
1384 /* Check the cqr */
1385 rc = dasd_check_cqr(cqr);
1386 if (rc) {
1387 cqr->intrc = rc;
1388 return rc;
1389 }
1390 device = (struct dasd_device *) cqr->startdev;
1391 if (((cqr->block &&
1392 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) ||
1393 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) &&
1394 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1395 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p "
1396 "because of stolen lock", cqr);
1397 cqr->status = DASD_CQR_ERROR;
1398 cqr->intrc = -EPERM;
1399 return -EPERM;
1400 }
1401 if (cqr->retries < 0) {
1402 /* internal error 14 - start_IO run out of retries */
1403 sprintf(errorstring, "14 %p", cqr);
1404 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1405 "device driver, reason=%s\n", errorstring);
1406 cqr->status = DASD_CQR_ERROR;
1407 return -EIO;
1408 }
1409 cqr->startclk = get_clock();
1410 cqr->starttime = jiffies;
1411 cqr->retries--;
1412 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1413 cqr->lpm &= device->path_data.opm;
1414 if (!cqr->lpm)
1415 cqr->lpm = device->path_data.opm;
1416 }
1417 if (cqr->cpmode == 1) {
1418 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
1419 (long) cqr, cqr->lpm);
1420 } else {
1421 rc = ccw_device_start(device->cdev, cqr->cpaddr,
1422 (long) cqr, cqr->lpm, 0);
1423 }
1424 switch (rc) {
1425 case 0:
1426 cqr->status = DASD_CQR_IN_IO;
1427 break;
1428 case -EBUSY:
1429 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1430 "start_IO: device busy, retry later");
1431 break;
1432 case -ETIMEDOUT:
1433 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1434 "start_IO: request timeout, retry later");
1435 break;
1436 case -EACCES:
1437 /* -EACCES indicates that the request used only a subset of the
1438 * available paths and all these paths are gone. If the lpm of
1439 * this request was only a subset of the opm (e.g. the ppm) then
1440 * we just do a retry with all available paths.
1441 * If we already use the full opm, something is amiss, and we
1442 * need a full path verification.
1443 */
1444 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1445 DBF_DEV_EVENT(DBF_WARNING, device,
1446 "start_IO: selected paths gone (%x)",
1447 cqr->lpm);
1448 } else if (cqr->lpm != device->path_data.opm) {
1449 cqr->lpm = device->path_data.opm;
1450 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
1451 "start_IO: selected paths gone,"
1452 " retry on all paths");
1453 } else {
1454 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1455 "start_IO: all paths in opm gone,"
1456 " do path verification");
1457 dasd_generic_last_path_gone(device);
1458 device->path_data.opm = 0;
1459 device->path_data.ppm = 0;
1460 device->path_data.npm = 0;
1461 device->path_data.tbvpm =
1462 ccw_device_get_path_mask(device->cdev);
1463 }
1464 break;
1465 case -ENODEV:
1466 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1467 "start_IO: -ENODEV device gone, retry");
1468 break;
1469 case -EIO:
1470 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1471 "start_IO: -EIO device gone, retry");
1472 break;
1473 case -EINVAL:
1474 /* most likely caused in power management context */
1475 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1476 "start_IO: -EINVAL device currently "
1477 "not accessible");
1478 break;
1479 default:
1480 /* internal error 11 - unknown rc */
1481 snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
1482 dev_err(&device->cdev->dev,
1483 "An error occurred in the DASD device driver, "
1484 "reason=%s\n", errorstring);
1485 BUG();
1486 break;
1487 }
1488 cqr->intrc = rc;
1489 return rc;
1490 }
1491
1492 /*
1493 * Timeout function for dasd devices. This is used for different purposes
1494 * 1) missing interrupt handler for normal operation
1495 * 2) delayed start of request where start_IO failed with -EBUSY
1496 * 3) timeout for missing state change interrupts
1497 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
1498 * DASD_CQR_QUEUED for 2) and 3).
1499 */
1500 static void dasd_device_timeout(unsigned long ptr)
1501 {
1502 unsigned long flags;
1503 struct dasd_device *device;
1504
1505 device = (struct dasd_device *) ptr;
1506 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1507 /* re-activate request queue */
1508 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1509 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1510 dasd_schedule_device_bh(device);
1511 }
1512
1513 /*
1514 * Setup timeout for a device in jiffies.
1515 */
1516 void dasd_device_set_timer(struct dasd_device *device, int expires)
1517 {
1518 if (expires == 0)
1519 del_timer(&device->timer);
1520 else
1521 mod_timer(&device->timer, jiffies + expires);
1522 }
1523
1524 /*
1525 * Clear timeout for a device.
1526 */
1527 void dasd_device_clear_timer(struct dasd_device *device)
1528 {
1529 del_timer(&device->timer);
1530 }
1531
1532 static void dasd_handle_killed_request(struct ccw_device *cdev,
1533 unsigned long intparm)
1534 {
1535 struct dasd_ccw_req *cqr;
1536 struct dasd_device *device;
1537
1538 if (!intparm)
1539 return;
1540 cqr = (struct dasd_ccw_req *) intparm;
1541 if (cqr->status != DASD_CQR_IN_IO) {
1542 DBF_EVENT_DEVID(DBF_DEBUG, cdev,
1543 "invalid status in handle_killed_request: "
1544 "%02x", cqr->status);
1545 return;
1546 }
1547
1548 device = dasd_device_from_cdev_locked(cdev);
1549 if (IS_ERR(device)) {
1550 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1551 "unable to get device from cdev");
1552 return;
1553 }
1554
1555 if (!cqr->startdev ||
1556 device != cqr->startdev ||
1557 strncmp(cqr->startdev->discipline->ebcname,
1558 (char *) &cqr->magic, 4)) {
1559 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1560 "invalid device in request");
1561 dasd_put_device(device);
1562 return;
1563 }
1564
1565 /* Schedule request to be retried. */
1566 cqr->status = DASD_CQR_QUEUED;
1567
1568 dasd_device_clear_timer(device);
1569 dasd_schedule_device_bh(device);
1570 dasd_put_device(device);
1571 }
1572
1573 void dasd_generic_handle_state_change(struct dasd_device *device)
1574 {
1575 /* First of all start sense subsystem status request. */
1576 dasd_eer_snss(device);
1577
1578 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1579 dasd_schedule_device_bh(device);
1580 if (device->block)
1581 dasd_schedule_block_bh(device->block);
1582 }
1583
1584 /*
1585 * Interrupt handler for "normal" ssch-io based dasd devices.
1586 */
1587 void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1588 struct irb *irb)
1589 {
1590 struct dasd_ccw_req *cqr, *next;
1591 struct dasd_device *device;
1592 unsigned long long now;
1593 int expires;
1594
1595 if (IS_ERR(irb)) {
1596 switch (PTR_ERR(irb)) {
1597 case -EIO:
1598 break;
1599 case -ETIMEDOUT:
1600 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1601 "request timed out\n", __func__);
1602 break;
1603 default:
1604 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1605 "unknown error %ld\n", __func__,
1606 PTR_ERR(irb));
1607 }
1608 dasd_handle_killed_request(cdev, intparm);
1609 return;
1610 }
1611
1612 now = get_clock();
1613 cqr = (struct dasd_ccw_req *) intparm;
1614 /* check for conditions that should be handled immediately */
1615 if (!cqr ||
1616 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1617 scsw_cstat(&irb->scsw) == 0)) {
1618 if (cqr)
1619 memcpy(&cqr->irb, irb, sizeof(*irb));
1620 device = dasd_device_from_cdev_locked(cdev);
1621 if (IS_ERR(device))
1622 return;
1623 /* ignore unsolicited interrupts for DIAG discipline */
1624 if (device->discipline == dasd_diag_discipline_pointer) {
1625 dasd_put_device(device);
1626 return;
1627 }
1628 device->discipline->dump_sense_dbf(device, irb, "int");
1629 if (device->features & DASD_FEATURE_ERPLOG)
1630 device->discipline->dump_sense(device, cqr, irb);
1631 device->discipline->check_for_device_change(device, cqr, irb);
1632 dasd_put_device(device);
1633 }
1634 if (!cqr)
1635 return;
1636
1637 device = (struct dasd_device *) cqr->startdev;
1638 if (!device ||
1639 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
1640 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1641 "invalid device in request");
1642 return;
1643 }
1644
1645 /* Check for clear pending */
1646 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
1647 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
1648 cqr->status = DASD_CQR_CLEARED;
1649 dasd_device_clear_timer(device);
1650 wake_up(&dasd_flush_wq);
1651 dasd_schedule_device_bh(device);
1652 return;
1653 }
1654
1655 /* check status - the request might have been killed by dyn detach */
1656 if (cqr->status != DASD_CQR_IN_IO) {
1657 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1658 "status %02x", dev_name(&cdev->dev), cqr->status);
1659 return;
1660 }
1661
1662 next = NULL;
1663 expires = 0;
1664 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1665 scsw_cstat(&irb->scsw) == 0) {
1666 /* request was completed successfully */
1667 cqr->status = DASD_CQR_SUCCESS;
1668 cqr->stopclk = now;
1669 /* Start first request on queue if possible -> fast_io. */
1670 if (cqr->devlist.next != &device->ccw_queue) {
1671 next = list_entry(cqr->devlist.next,
1672 struct dasd_ccw_req, devlist);
1673 }
1674 } else { /* error */
1675 /*
1676 * If we don't want complex ERP for this request, then just
1677 * reset this and retry it in the fastpath
1678 */
1679 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
1680 cqr->retries > 0) {
1681 if (cqr->lpm == device->path_data.opm)
1682 DBF_DEV_EVENT(DBF_DEBUG, device,
1683 "default ERP in fastpath "
1684 "(%i retries left)",
1685 cqr->retries);
1686 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
1687 cqr->lpm = device->path_data.opm;
1688 cqr->status = DASD_CQR_QUEUED;
1689 next = cqr;
1690 } else
1691 cqr->status = DASD_CQR_ERROR;
1692 }
1693 if (next && (next->status == DASD_CQR_QUEUED) &&
1694 (!device->stopped)) {
1695 if (device->discipline->start_IO(next) == 0)
1696 expires = next->expires;
1697 }
1698 if (expires != 0)
1699 dasd_device_set_timer(device, expires);
1700 else
1701 dasd_device_clear_timer(device);
1702 dasd_schedule_device_bh(device);
1703 }
1704
1705 enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
1706 {
1707 struct dasd_device *device;
1708
1709 device = dasd_device_from_cdev_locked(cdev);
1710
1711 if (IS_ERR(device))
1712 goto out;
1713 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1714 device->state != device->target ||
1715 !device->discipline->check_for_device_change){
1716 dasd_put_device(device);
1717 goto out;
1718 }
1719 if (device->discipline->dump_sense_dbf)
1720 device->discipline->dump_sense_dbf(device, irb, "uc");
1721 device->discipline->check_for_device_change(device, NULL, irb);
1722 dasd_put_device(device);
1723 out:
1724 return UC_TODO_RETRY;
1725 }
1726 EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
1727
1728 /*
1729 * If we have an error on a dasd_block layer request then we cancel
1730 * and return all further requests from the same dasd_block as well.
1731 */
1732 static void __dasd_device_recovery(struct dasd_device *device,
1733 struct dasd_ccw_req *ref_cqr)
1734 {
1735 struct list_head *l, *n;
1736 struct dasd_ccw_req *cqr;
1737
1738 /*
1739 * only requeue request that came from the dasd_block layer
1740 */
1741 if (!ref_cqr->block)
1742 return;
1743
1744 list_for_each_safe(l, n, &device->ccw_queue) {
1745 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1746 if (cqr->status == DASD_CQR_QUEUED &&
1747 ref_cqr->block == cqr->block) {
1748 cqr->status = DASD_CQR_CLEARED;
1749 }
1750 }
1751 };
1752
1753 /*
1754 * Remove those ccw requests from the queue that need to be returned
1755 * to the upper layer.
1756 */
1757 static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1758 struct list_head *final_queue)
1759 {
1760 struct list_head *l, *n;
1761 struct dasd_ccw_req *cqr;
1762
1763 /* Process request with final status. */
1764 list_for_each_safe(l, n, &device->ccw_queue) {
1765 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1766
1767 /* Stop list processing at the first non-final request. */
1768 if (cqr->status == DASD_CQR_QUEUED ||
1769 cqr->status == DASD_CQR_IN_IO ||
1770 cqr->status == DASD_CQR_CLEAR_PENDING)
1771 break;
1772 if (cqr->status == DASD_CQR_ERROR) {
1773 __dasd_device_recovery(device, cqr);
1774 }
1775 /* Rechain finished requests to final queue */
1776 list_move_tail(&cqr->devlist, final_queue);
1777 }
1778 }
1779
1780 /*
1781 * the cqrs from the final queue are returned to the upper layer
1782 * by setting a dasd_block state and calling the callback function
1783 */
1784 static void __dasd_device_process_final_queue(struct dasd_device *device,
1785 struct list_head *final_queue)
1786 {
1787 struct list_head *l, *n;
1788 struct dasd_ccw_req *cqr;
1789 struct dasd_block *block;
1790 void (*callback)(struct dasd_ccw_req *, void *data);
1791 void *callback_data;
1792 char errorstring[ERRORLENGTH];
1793
1794 list_for_each_safe(l, n, final_queue) {
1795 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1796 list_del_init(&cqr->devlist);
1797 block = cqr->block;
1798 callback = cqr->callback;
1799 callback_data = cqr->callback_data;
1800 if (block)
1801 spin_lock_bh(&block->queue_lock);
1802 switch (cqr->status) {
1803 case DASD_CQR_SUCCESS:
1804 cqr->status = DASD_CQR_DONE;
1805 break;
1806 case DASD_CQR_ERROR:
1807 cqr->status = DASD_CQR_NEED_ERP;
1808 break;
1809 case DASD_CQR_CLEARED:
1810 cqr->status = DASD_CQR_TERMINATED;
1811 break;
1812 default:
1813 /* internal error 12 - wrong cqr status*/
1814 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1815 dev_err(&device->cdev->dev,
1816 "An error occurred in the DASD device driver, "
1817 "reason=%s\n", errorstring);
1818 BUG();
1819 }
1820 if (cqr->callback != NULL)
1821 (callback)(cqr, callback_data);
1822 if (block)
1823 spin_unlock_bh(&block->queue_lock);
1824 }
1825 }
1826
1827 /*
1828 * Take a look at the first request on the ccw queue and check
1829 * if it reached its expire time. If so, terminate the IO.
1830 */
1831 static void __dasd_device_check_expire(struct dasd_device *device)
1832 {
1833 struct dasd_ccw_req *cqr;
1834
1835 if (list_empty(&device->ccw_queue))
1836 return;
1837 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1838 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1839 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
1840 if (device->discipline->term_IO(cqr) != 0) {
1841 /* Hmpf, try again in 5 sec */
1842 dev_err(&device->cdev->dev,
1843 "cqr %p timed out (%lus) but cannot be "
1844 "ended, retrying in 5 s\n",
1845 cqr, (cqr->expires/HZ));
1846 cqr->expires += 5*HZ;
1847 dasd_device_set_timer(device, 5*HZ);
1848 } else {
1849 dev_err(&device->cdev->dev,
1850 "cqr %p timed out (%lus), %i retries "
1851 "remaining\n", cqr, (cqr->expires/HZ),
1852 cqr->retries);
1853 }
1854 }
1855 }
1856
1857 /*
1858 * Take a look at the first request on the ccw queue and check
1859 * if it needs to be started.
1860 */
1861 static void __dasd_device_start_head(struct dasd_device *device)
1862 {
1863 struct dasd_ccw_req *cqr;
1864 int rc;
1865
1866 if (list_empty(&device->ccw_queue))
1867 return;
1868 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1869 if (cqr->status != DASD_CQR_QUEUED)
1870 return;
1871 /* when device is stopped, return request to previous layer
1872 * exception: only the disconnect or unresumed bits are set and the
1873 * cqr is a path verification request
1874 */
1875 if (device->stopped &&
1876 !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
1877 && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) {
1878 cqr->intrc = -EAGAIN;
1879 cqr->status = DASD_CQR_CLEARED;
1880 dasd_schedule_device_bh(device);
1881 return;
1882 }
1883
1884 rc = device->discipline->start_IO(cqr);
1885 if (rc == 0)
1886 dasd_device_set_timer(device, cqr->expires);
1887 else if (rc == -EACCES) {
1888 dasd_schedule_device_bh(device);
1889 } else
1890 /* Hmpf, try again in 1/2 sec */
1891 dasd_device_set_timer(device, 50);
1892 }
1893
1894 static void __dasd_device_check_path_events(struct dasd_device *device)
1895 {
1896 int rc;
1897
1898 if (device->path_data.tbvpm) {
1899 if (device->stopped & ~(DASD_STOPPED_DC_WAIT |
1900 DASD_UNRESUMED_PM))
1901 return;
1902 rc = device->discipline->verify_path(
1903 device, device->path_data.tbvpm);
1904 if (rc)
1905 dasd_device_set_timer(device, 50);
1906 else
1907 device->path_data.tbvpm = 0;
1908 }
1909 };
1910
1911 /*
1912 * Go through all request on the dasd_device request queue,
1913 * terminate them on the cdev if necessary, and return them to the
1914 * submitting layer via callback.
1915 * Note:
1916 * Make sure that all 'submitting layers' still exist when
1917 * this function is called!. In other words, when 'device' is a base
1918 * device then all block layer requests must have been removed before
1919 * via dasd_flush_block_queue.
1920 */
1921 int dasd_flush_device_queue(struct dasd_device *device)
1922 {
1923 struct dasd_ccw_req *cqr, *n;
1924 int rc;
1925 struct list_head flush_queue;
1926
1927 INIT_LIST_HEAD(&flush_queue);
1928 spin_lock_irq(get_ccwdev_lock(device->cdev));
1929 rc = 0;
1930 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
1931 /* Check status and move request to flush_queue */
1932 switch (cqr->status) {
1933 case DASD_CQR_IN_IO:
1934 rc = device->discipline->term_IO(cqr);
1935 if (rc) {
1936 /* unable to terminate requeust */
1937 dev_err(&device->cdev->dev,
1938 "Flushing the DASD request queue "
1939 "failed for request %p\n", cqr);
1940 /* stop flush processing */
1941 goto finished;
1942 }
1943 break;
1944 case DASD_CQR_QUEUED:
1945 cqr->stopclk = get_clock();
1946 cqr->status = DASD_CQR_CLEARED;
1947 break;
1948 default: /* no need to modify the others */
1949 break;
1950 }
1951 list_move_tail(&cqr->devlist, &flush_queue);
1952 }
1953 finished:
1954 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1955 /*
1956 * After this point all requests must be in state CLEAR_PENDING,
1957 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
1958 * one of the others.
1959 */
1960 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
1961 wait_event(dasd_flush_wq,
1962 (cqr->status != DASD_CQR_CLEAR_PENDING));
1963 /*
1964 * Now set each request back to TERMINATED, DONE or NEED_ERP
1965 * and call the callback function of flushed requests
1966 */
1967 __dasd_device_process_final_queue(device, &flush_queue);
1968 return rc;
1969 }
1970
1971 /*
1972 * Acquire the device lock and process queues for the device.
1973 */
1974 static void dasd_device_tasklet(struct dasd_device *device)
1975 {
1976 struct list_head final_queue;
1977
1978 atomic_set (&device->tasklet_scheduled, 0);
1979 INIT_LIST_HEAD(&final_queue);
1980 spin_lock_irq(get_ccwdev_lock(device->cdev));
1981 /* Check expire time of first request on the ccw queue. */
1982 __dasd_device_check_expire(device);
1983 /* find final requests on ccw queue */
1984 __dasd_device_process_ccw_queue(device, &final_queue);
1985 __dasd_device_check_path_events(device);
1986 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1987 /* Now call the callback function of requests with final status */
1988 __dasd_device_process_final_queue(device, &final_queue);
1989 spin_lock_irq(get_ccwdev_lock(device->cdev));
1990 /* Now check if the head of the ccw queue needs to be started. */
1991 __dasd_device_start_head(device);
1992 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1993 dasd_put_device(device);
1994 }
1995
1996 /*
1997 * Schedules a call to dasd_tasklet over the device tasklet.
1998 */
1999 void dasd_schedule_device_bh(struct dasd_device *device)
2000 {
2001 /* Protect against rescheduling. */
2002 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
2003 return;
2004 dasd_get_device(device);
2005 tasklet_hi_schedule(&device->tasklet);
2006 }
2007
2008 void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
2009 {
2010 device->stopped |= bits;
2011 }
2012 EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
2013
2014 void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
2015 {
2016 device->stopped &= ~bits;
2017 if (!device->stopped)
2018 wake_up(&generic_waitq);
2019 }
2020 EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
2021
2022 /*
2023 * Queue a request to the head of the device ccw_queue.
2024 * Start the I/O if possible.
2025 */
2026 void dasd_add_request_head(struct dasd_ccw_req *cqr)
2027 {
2028 struct dasd_device *device;
2029 unsigned long flags;
2030
2031 device = cqr->startdev;
2032 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2033 cqr->status = DASD_CQR_QUEUED;
2034 list_add(&cqr->devlist, &device->ccw_queue);
2035 /* let the bh start the request to keep them in order */
2036 dasd_schedule_device_bh(device);
2037 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2038 }
2039
2040 /*
2041 * Queue a request to the tail of the device ccw_queue.
2042 * Start the I/O if possible.
2043 */
2044 void dasd_add_request_tail(struct dasd_ccw_req *cqr)
2045 {
2046 struct dasd_device *device;
2047 unsigned long flags;
2048
2049 device = cqr->startdev;
2050 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2051 cqr->status = DASD_CQR_QUEUED;
2052 list_add_tail(&cqr->devlist, &device->ccw_queue);
2053 /* let the bh start the request to keep them in order */
2054 dasd_schedule_device_bh(device);
2055 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2056 }
2057
2058 /*
2059 * Wakeup helper for the 'sleep_on' functions.
2060 */
2061 void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
2062 {
2063 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2064 cqr->callback_data = DASD_SLEEPON_END_TAG;
2065 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2066 wake_up(&generic_waitq);
2067 }
2068 EXPORT_SYMBOL_GPL(dasd_wakeup_cb);
2069
2070 static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
2071 {
2072 struct dasd_device *device;
2073 int rc;
2074
2075 device = cqr->startdev;
2076 spin_lock_irq(get_ccwdev_lock(device->cdev));
2077 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
2078 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2079 return rc;
2080 }
2081
2082 /*
2083 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
2084 */
2085 static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
2086 {
2087 struct dasd_device *device;
2088 dasd_erp_fn_t erp_fn;
2089
2090 if (cqr->status == DASD_CQR_FILLED)
2091 return 0;
2092 device = cqr->startdev;
2093 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2094 if (cqr->status == DASD_CQR_TERMINATED) {
2095 device->discipline->handle_terminated_request(cqr);
2096 return 1;
2097 }
2098 if (cqr->status == DASD_CQR_NEED_ERP) {
2099 erp_fn = device->discipline->erp_action(cqr);
2100 erp_fn(cqr);
2101 return 1;
2102 }
2103 if (cqr->status == DASD_CQR_FAILED)
2104 dasd_log_sense(cqr, &cqr->irb);
2105 if (cqr->refers) {
2106 __dasd_process_erp(device, cqr);
2107 return 1;
2108 }
2109 }
2110 return 0;
2111 }
2112
2113 static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
2114 {
2115 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2116 if (cqr->refers) /* erp is not done yet */
2117 return 1;
2118 return ((cqr->status != DASD_CQR_DONE) &&
2119 (cqr->status != DASD_CQR_FAILED));
2120 } else
2121 return (cqr->status == DASD_CQR_FILLED);
2122 }
2123
2124 static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
2125 {
2126 struct dasd_device *device;
2127 int rc;
2128 struct list_head ccw_queue;
2129 struct dasd_ccw_req *cqr;
2130
2131 INIT_LIST_HEAD(&ccw_queue);
2132 maincqr->status = DASD_CQR_FILLED;
2133 device = maincqr->startdev;
2134 list_add(&maincqr->blocklist, &ccw_queue);
2135 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
2136 cqr = list_first_entry(&ccw_queue,
2137 struct dasd_ccw_req, blocklist)) {
2138
2139 if (__dasd_sleep_on_erp(cqr))
2140 continue;
2141 if (cqr->status != DASD_CQR_FILLED) /* could be failed */
2142 continue;
2143 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2144 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2145 cqr->status = DASD_CQR_FAILED;
2146 cqr->intrc = -EPERM;
2147 continue;
2148 }
2149 /* Non-temporary stop condition will trigger fail fast */
2150 if (device->stopped & ~DASD_STOPPED_PENDING &&
2151 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2152 (!dasd_eer_enabled(device))) {
2153 cqr->status = DASD_CQR_FAILED;
2154 continue;
2155 }
2156 /* Don't try to start requests if device is stopped */
2157 if (interruptible) {
2158 rc = wait_event_interruptible(
2159 generic_waitq, !(device->stopped));
2160 if (rc == -ERESTARTSYS) {
2161 cqr->status = DASD_CQR_FAILED;
2162 maincqr->intrc = rc;
2163 continue;
2164 }
2165 } else
2166 wait_event(generic_waitq, !(device->stopped));
2167
2168 if (!cqr->callback)
2169 cqr->callback = dasd_wakeup_cb;
2170
2171 cqr->callback_data = DASD_SLEEPON_START_TAG;
2172 dasd_add_request_tail(cqr);
2173 if (interruptible) {
2174 rc = wait_event_interruptible(
2175 generic_waitq, _wait_for_wakeup(cqr));
2176 if (rc == -ERESTARTSYS) {
2177 dasd_cancel_req(cqr);
2178 /* wait (non-interruptible) for final status */
2179 wait_event(generic_waitq,
2180 _wait_for_wakeup(cqr));
2181 cqr->status = DASD_CQR_FAILED;
2182 maincqr->intrc = rc;
2183 continue;
2184 }
2185 } else
2186 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2187 }
2188
2189 maincqr->endclk = get_clock();
2190 if ((maincqr->status != DASD_CQR_DONE) &&
2191 (maincqr->intrc != -ERESTARTSYS))
2192 dasd_log_sense(maincqr, &maincqr->irb);
2193 if (maincqr->status == DASD_CQR_DONE)
2194 rc = 0;
2195 else if (maincqr->intrc)
2196 rc = maincqr->intrc;
2197 else
2198 rc = -EIO;
2199 return rc;
2200 }
2201
2202 /*
2203 * Queue a request to the tail of the device ccw_queue and wait for
2204 * it's completion.
2205 */
2206 int dasd_sleep_on(struct dasd_ccw_req *cqr)
2207 {
2208 return _dasd_sleep_on(cqr, 0);
2209 }
2210
2211 /*
2212 * Queue a request to the tail of the device ccw_queue and wait
2213 * interruptible for it's completion.
2214 */
2215 int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
2216 {
2217 return _dasd_sleep_on(cqr, 1);
2218 }
2219
2220 /*
2221 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
2222 * for eckd devices) the currently running request has to be terminated
2223 * and be put back to status queued, before the special request is added
2224 * to the head of the queue. Then the special request is waited on normally.
2225 */
2226 static inline int _dasd_term_running_cqr(struct dasd_device *device)
2227 {
2228 struct dasd_ccw_req *cqr;
2229 int rc;
2230
2231 if (list_empty(&device->ccw_queue))
2232 return 0;
2233 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
2234 rc = device->discipline->term_IO(cqr);
2235 if (!rc)
2236 /*
2237 * CQR terminated because a more important request is pending.
2238 * Undo decreasing of retry counter because this is
2239 * not an error case.
2240 */
2241 cqr->retries++;
2242 return rc;
2243 }
2244
2245 int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
2246 {
2247 struct dasd_device *device;
2248 int rc;
2249
2250 device = cqr->startdev;
2251 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2252 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2253 cqr->status = DASD_CQR_FAILED;
2254 cqr->intrc = -EPERM;
2255 return -EIO;
2256 }
2257 spin_lock_irq(get_ccwdev_lock(device->cdev));
2258 rc = _dasd_term_running_cqr(device);
2259 if (rc) {
2260 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2261 return rc;
2262 }
2263 cqr->callback = dasd_wakeup_cb;
2264 cqr->callback_data = DASD_SLEEPON_START_TAG;
2265 cqr->status = DASD_CQR_QUEUED;
2266 /*
2267 * add new request as second
2268 * first the terminated cqr needs to be finished
2269 */
2270 list_add(&cqr->devlist, device->ccw_queue.next);
2271
2272 /* let the bh start the request to keep them in order */
2273 dasd_schedule_device_bh(device);
2274
2275 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2276
2277 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2278
2279 if (cqr->status == DASD_CQR_DONE)
2280 rc = 0;
2281 else if (cqr->intrc)
2282 rc = cqr->intrc;
2283 else
2284 rc = -EIO;
2285 return rc;
2286 }
2287
2288 /*
2289 * Cancels a request that was started with dasd_sleep_on_req.
2290 * This is useful to timeout requests. The request will be
2291 * terminated if it is currently in i/o.
2292 * Returns 1 if the request has been terminated.
2293 * 0 if there was no need to terminate the request (not started yet)
2294 * negative error code if termination failed
2295 * Cancellation of a request is an asynchronous operation! The calling
2296 * function has to wait until the request is properly returned via callback.
2297 */
2298 int dasd_cancel_req(struct dasd_ccw_req *cqr)
2299 {
2300 struct dasd_device *device = cqr->startdev;
2301 unsigned long flags;
2302 int rc;
2303
2304 rc = 0;
2305 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2306 switch (cqr->status) {
2307 case DASD_CQR_QUEUED:
2308 /* request was not started - just set to cleared */
2309 cqr->status = DASD_CQR_CLEARED;
2310 break;
2311 case DASD_CQR_IN_IO:
2312 /* request in IO - terminate IO and release again */
2313 rc = device->discipline->term_IO(cqr);
2314 if (rc) {
2315 dev_err(&device->cdev->dev,
2316 "Cancelling request %p failed with rc=%d\n",
2317 cqr, rc);
2318 } else {
2319 cqr->stopclk = get_clock();
2320 }
2321 break;
2322 default: /* already finished or clear pending - do nothing */
2323 break;
2324 }
2325 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2326 dasd_schedule_device_bh(device);
2327 return rc;
2328 }
2329
2330
2331 /*
2332 * SECTION: Operations of the dasd_block layer.
2333 */
2334
2335 /*
2336 * Timeout function for dasd_block. This is used when the block layer
2337 * is waiting for something that may not come reliably, (e.g. a state
2338 * change interrupt)
2339 */
2340 static void dasd_block_timeout(unsigned long ptr)
2341 {
2342 unsigned long flags;
2343 struct dasd_block *block;
2344
2345 block = (struct dasd_block *) ptr;
2346 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
2347 /* re-activate request queue */
2348 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
2349 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
2350 dasd_schedule_block_bh(block);
2351 }
2352
2353 /*
2354 * Setup timeout for a dasd_block in jiffies.
2355 */
2356 void dasd_block_set_timer(struct dasd_block *block, int expires)
2357 {
2358 if (expires == 0)
2359 del_timer(&block->timer);
2360 else
2361 mod_timer(&block->timer, jiffies + expires);
2362 }
2363
2364 /*
2365 * Clear timeout for a dasd_block.
2366 */
2367 void dasd_block_clear_timer(struct dasd_block *block)
2368 {
2369 del_timer(&block->timer);
2370 }
2371
2372 /*
2373 * Process finished error recovery ccw.
2374 */
2375 static void __dasd_process_erp(struct dasd_device *device,
2376 struct dasd_ccw_req *cqr)
2377 {
2378 dasd_erp_fn_t erp_fn;
2379
2380 if (cqr->status == DASD_CQR_DONE)
2381 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
2382 else
2383 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
2384 erp_fn = device->discipline->erp_postaction(cqr);
2385 erp_fn(cqr);
2386 }
2387
2388 /*
2389 * Fetch requests from the block device queue.
2390 */
2391 static void __dasd_process_request_queue(struct dasd_block *block)
2392 {
2393 struct request_queue *queue;
2394 struct request *req;
2395 struct dasd_ccw_req *cqr;
2396 struct dasd_device *basedev;
2397 unsigned long flags;
2398 queue = block->request_queue;
2399 basedev = block->base;
2400 /* No queue ? Then there is nothing to do. */
2401 if (queue == NULL)
2402 return;
2403
2404 /*
2405 * We requeue request from the block device queue to the ccw
2406 * queue only in two states. In state DASD_STATE_READY the
2407 * partition detection is done and we need to requeue requests
2408 * for that. State DASD_STATE_ONLINE is normal block device
2409 * operation.
2410 */
2411 if (basedev->state < DASD_STATE_READY) {
2412 while ((req = blk_fetch_request(block->request_queue)))
2413 __blk_end_request_all(req, -EIO);
2414 return;
2415 }
2416 /* Now we try to fetch requests from the request queue */
2417 while ((req = blk_peek_request(queue))) {
2418 if (basedev->features & DASD_FEATURE_READONLY &&
2419 rq_data_dir(req) == WRITE) {
2420 DBF_DEV_EVENT(DBF_ERR, basedev,
2421 "Rejecting write request %p",
2422 req);
2423 blk_start_request(req);
2424 __blk_end_request_all(req, -EIO);
2425 continue;
2426 }
2427 cqr = basedev->discipline->build_cp(basedev, block, req);
2428 if (IS_ERR(cqr)) {
2429 if (PTR_ERR(cqr) == -EBUSY)
2430 break; /* normal end condition */
2431 if (PTR_ERR(cqr) == -ENOMEM)
2432 break; /* terminate request queue loop */
2433 if (PTR_ERR(cqr) == -EAGAIN) {
2434 /*
2435 * The current request cannot be build right
2436 * now, we have to try later. If this request
2437 * is the head-of-queue we stop the device
2438 * for 1/2 second.
2439 */
2440 if (!list_empty(&block->ccw_queue))
2441 break;
2442 spin_lock_irqsave(
2443 get_ccwdev_lock(basedev->cdev), flags);
2444 dasd_device_set_stop_bits(basedev,
2445 DASD_STOPPED_PENDING);
2446 spin_unlock_irqrestore(
2447 get_ccwdev_lock(basedev->cdev), flags);
2448 dasd_block_set_timer(block, HZ/2);
2449 break;
2450 }
2451 DBF_DEV_EVENT(DBF_ERR, basedev,
2452 "CCW creation failed (rc=%ld) "
2453 "on request %p",
2454 PTR_ERR(cqr), req);
2455 blk_start_request(req);
2456 __blk_end_request_all(req, -EIO);
2457 continue;
2458 }
2459 /*
2460 * Note: callback is set to dasd_return_cqr_cb in
2461 * __dasd_block_start_head to cover erp requests as well
2462 */
2463 cqr->callback_data = (void *) req;
2464 cqr->status = DASD_CQR_FILLED;
2465 blk_start_request(req);
2466 list_add_tail(&cqr->blocklist, &block->ccw_queue);
2467 dasd_profile_start(block, cqr, req);
2468 }
2469 }
2470
2471 static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
2472 {
2473 struct request *req;
2474 int status;
2475 int error = 0;
2476
2477 req = (struct request *) cqr->callback_data;
2478 dasd_profile_end(cqr->block, cqr, req);
2479 status = cqr->block->base->discipline->free_cp(cqr, req);
2480 if (status <= 0)
2481 error = status ? status : -EIO;
2482 __blk_end_request_all(req, error);
2483 }
2484
2485 /*
2486 * Process ccw request queue.
2487 */
2488 static void __dasd_process_block_ccw_queue(struct dasd_block *block,
2489 struct list_head *final_queue)
2490 {
2491 struct list_head *l, *n;
2492 struct dasd_ccw_req *cqr;
2493 dasd_erp_fn_t erp_fn;
2494 unsigned long flags;
2495 struct dasd_device *base = block->base;
2496
2497 restart:
2498 /* Process request with final status. */
2499 list_for_each_safe(l, n, &block->ccw_queue) {
2500 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2501 if (cqr->status != DASD_CQR_DONE &&
2502 cqr->status != DASD_CQR_FAILED &&
2503 cqr->status != DASD_CQR_NEED_ERP &&
2504 cqr->status != DASD_CQR_TERMINATED)
2505 continue;
2506
2507 if (cqr->status == DASD_CQR_TERMINATED) {
2508 base->discipline->handle_terminated_request(cqr);
2509 goto restart;
2510 }
2511
2512 /* Process requests that may be recovered */
2513 if (cqr->status == DASD_CQR_NEED_ERP) {
2514 erp_fn = base->discipline->erp_action(cqr);
2515 if (IS_ERR(erp_fn(cqr)))
2516 continue;
2517 goto restart;
2518 }
2519
2520 /* log sense for fatal error */
2521 if (cqr->status == DASD_CQR_FAILED) {
2522 dasd_log_sense(cqr, &cqr->irb);
2523 }
2524
2525 /* First of all call extended error reporting. */
2526 if (dasd_eer_enabled(base) &&
2527 cqr->status == DASD_CQR_FAILED) {
2528 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
2529
2530 /* restart request */
2531 cqr->status = DASD_CQR_FILLED;
2532 cqr->retries = 255;
2533 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
2534 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
2535 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
2536 flags);
2537 goto restart;
2538 }
2539
2540 /* Process finished ERP request. */
2541 if (cqr->refers) {
2542 __dasd_process_erp(base, cqr);
2543 goto restart;
2544 }
2545
2546 /* Rechain finished requests to final queue */
2547 cqr->endclk = get_clock();
2548 list_move_tail(&cqr->blocklist, final_queue);
2549 }
2550 }
2551
2552 static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
2553 {
2554 dasd_schedule_block_bh(cqr->block);
2555 }
2556
2557 static void __dasd_block_start_head(struct dasd_block *block)
2558 {
2559 struct dasd_ccw_req *cqr;
2560
2561 if (list_empty(&block->ccw_queue))
2562 return;
2563 /* We allways begin with the first requests on the queue, as some
2564 * of previously started requests have to be enqueued on a
2565 * dasd_device again for error recovery.
2566 */
2567 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
2568 if (cqr->status != DASD_CQR_FILLED)
2569 continue;
2570 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
2571 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2572 cqr->status = DASD_CQR_FAILED;
2573 cqr->intrc = -EPERM;
2574 dasd_schedule_block_bh(block);
2575 continue;
2576 }
2577 /* Non-temporary stop condition will trigger fail fast */
2578 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
2579 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2580 (!dasd_eer_enabled(block->base))) {
2581 cqr->status = DASD_CQR_FAILED;
2582 dasd_schedule_block_bh(block);
2583 continue;
2584 }
2585 /* Don't try to start requests if device is stopped */
2586 if (block->base->stopped)
2587 return;
2588
2589 /* just a fail safe check, should not happen */
2590 if (!cqr->startdev)
2591 cqr->startdev = block->base;
2592
2593 /* make sure that the requests we submit find their way back */
2594 cqr->callback = dasd_return_cqr_cb;
2595
2596 dasd_add_request_tail(cqr);
2597 }
2598 }
2599
2600 /*
2601 * Central dasd_block layer routine. Takes requests from the generic
2602 * block layer request queue, creates ccw requests, enqueues them on
2603 * a dasd_device and processes ccw requests that have been returned.
2604 */
2605 static void dasd_block_tasklet(struct dasd_block *block)
2606 {
2607 struct list_head final_queue;
2608 struct list_head *l, *n;
2609 struct dasd_ccw_req *cqr;
2610
2611 atomic_set(&block->tasklet_scheduled, 0);
2612 INIT_LIST_HEAD(&final_queue);
2613 spin_lock(&block->queue_lock);
2614 /* Finish off requests on ccw queue */
2615 __dasd_process_block_ccw_queue(block, &final_queue);
2616 spin_unlock(&block->queue_lock);
2617 /* Now call the callback function of requests with final status */
2618 spin_lock_irq(&block->request_queue_lock);
2619 list_for_each_safe(l, n, &final_queue) {
2620 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2621 list_del_init(&cqr->blocklist);
2622 __dasd_cleanup_cqr(cqr);
2623 }
2624 spin_lock(&block->queue_lock);
2625 /* Get new request from the block device request queue */
2626 __dasd_process_request_queue(block);
2627 /* Now check if the head of the ccw queue needs to be started. */
2628 __dasd_block_start_head(block);
2629 spin_unlock(&block->queue_lock);
2630 spin_unlock_irq(&block->request_queue_lock);
2631 dasd_put_device(block->base);
2632 }
2633
2634 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2635 {
2636 wake_up(&dasd_flush_wq);
2637 }
2638
2639 /*
2640 * Go through all request on the dasd_block request queue, cancel them
2641 * on the respective dasd_device, and return them to the generic
2642 * block layer.
2643 */
2644 static int dasd_flush_block_queue(struct dasd_block *block)
2645 {
2646 struct dasd_ccw_req *cqr, *n;
2647 int rc, i;
2648 struct list_head flush_queue;
2649
2650 INIT_LIST_HEAD(&flush_queue);
2651 spin_lock_bh(&block->queue_lock);
2652 rc = 0;
2653 restart:
2654 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2655 /* if this request currently owned by a dasd_device cancel it */
2656 if (cqr->status >= DASD_CQR_QUEUED)
2657 rc = dasd_cancel_req(cqr);
2658 if (rc < 0)
2659 break;
2660 /* Rechain request (including erp chain) so it won't be
2661 * touched by the dasd_block_tasklet anymore.
2662 * Replace the callback so we notice when the request
2663 * is returned from the dasd_device layer.
2664 */
2665 cqr->callback = _dasd_wake_block_flush_cb;
2666 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2667 list_move_tail(&cqr->blocklist, &flush_queue);
2668 if (i > 1)
2669 /* moved more than one request - need to restart */
2670 goto restart;
2671 }
2672 spin_unlock_bh(&block->queue_lock);
2673 /* Now call the callback function of flushed requests */
2674 restart_cb:
2675 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
2676 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
2677 /* Process finished ERP request. */
2678 if (cqr->refers) {
2679 spin_lock_bh(&block->queue_lock);
2680 __dasd_process_erp(block->base, cqr);
2681 spin_unlock_bh(&block->queue_lock);
2682 /* restart list_for_xx loop since dasd_process_erp
2683 * might remove multiple elements */
2684 goto restart_cb;
2685 }
2686 /* call the callback function */
2687 spin_lock_irq(&block->request_queue_lock);
2688 cqr->endclk = get_clock();
2689 list_del_init(&cqr->blocklist);
2690 __dasd_cleanup_cqr(cqr);
2691 spin_unlock_irq(&block->request_queue_lock);
2692 }
2693 return rc;
2694 }
2695
2696 /*
2697 * Schedules a call to dasd_tasklet over the device tasklet.
2698 */
2699 void dasd_schedule_block_bh(struct dasd_block *block)
2700 {
2701 /* Protect against rescheduling. */
2702 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
2703 return;
2704 /* life cycle of block is bound to it's base device */
2705 dasd_get_device(block->base);
2706 tasklet_hi_schedule(&block->tasklet);
2707 }
2708
2709
2710 /*
2711 * SECTION: external block device operations
2712 * (request queue handling, open, release, etc.)
2713 */
2714
2715 /*
2716 * Dasd request queue function. Called from ll_rw_blk.c
2717 */
2718 static void do_dasd_request(struct request_queue *queue)
2719 {
2720 struct dasd_block *block;
2721
2722 block = queue->queuedata;
2723 spin_lock(&block->queue_lock);
2724 /* Get new request from the block device request queue */
2725 __dasd_process_request_queue(block);
2726 /* Now check if the head of the ccw queue needs to be started. */
2727 __dasd_block_start_head(block);
2728 spin_unlock(&block->queue_lock);
2729 }
2730
2731 /*
2732 * Allocate and initialize request queue and default I/O scheduler.
2733 */
2734 static int dasd_alloc_queue(struct dasd_block *block)
2735 {
2736 int rc;
2737
2738 block->request_queue = blk_init_queue(do_dasd_request,
2739 &block->request_queue_lock);
2740 if (block->request_queue == NULL)
2741 return -ENOMEM;
2742
2743 block->request_queue->queuedata = block;
2744
2745 elevator_exit(block->request_queue->elevator);
2746 block->request_queue->elevator = NULL;
2747 rc = elevator_init(block->request_queue, "deadline");
2748 if (rc) {
2749 blk_cleanup_queue(block->request_queue);
2750 return rc;
2751 }
2752 return 0;
2753 }
2754
2755 /*
2756 * Allocate and initialize request queue.
2757 */
2758 static void dasd_setup_queue(struct dasd_block *block)
2759 {
2760 int max;
2761
2762 if (block->base->features & DASD_FEATURE_USERAW) {
2763 /*
2764 * the max_blocks value for raw_track access is 256
2765 * it is higher than the native ECKD value because we
2766 * only need one ccw per track
2767 * so the max_hw_sectors are
2768 * 2048 x 512B = 1024kB = 16 tracks
2769 */
2770 max = 2048;
2771 } else {
2772 max = block->base->discipline->max_blocks << block->s2b_shift;
2773 }
2774 blk_queue_logical_block_size(block->request_queue,
2775 block->bp_block);
2776 blk_queue_max_hw_sectors(block->request_queue, max);
2777 blk_queue_max_segments(block->request_queue, -1L);
2778 /* with page sized segments we can translate each segement into
2779 * one idaw/tidaw
2780 */
2781 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
2782 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
2783 }
2784
2785 /*
2786 * Deactivate and free request queue.
2787 */
2788 static void dasd_free_queue(struct dasd_block *block)
2789 {
2790 if (block->request_queue) {
2791 blk_cleanup_queue(block->request_queue);
2792 block->request_queue = NULL;
2793 }
2794 }
2795
2796 /*
2797 * Flush request on the request queue.
2798 */
2799 static void dasd_flush_request_queue(struct dasd_block *block)
2800 {
2801 struct request *req;
2802
2803 if (!block->request_queue)
2804 return;
2805
2806 spin_lock_irq(&block->request_queue_lock);
2807 while ((req = blk_fetch_request(block->request_queue)))
2808 __blk_end_request_all(req, -EIO);
2809 spin_unlock_irq(&block->request_queue_lock);
2810 }
2811
2812 static int dasd_open(struct block_device *bdev, fmode_t mode)
2813 {
2814 struct dasd_device *base;
2815 int rc;
2816
2817 base = dasd_device_from_gendisk(bdev->bd_disk);
2818 if (!base)
2819 return -ENODEV;
2820
2821 atomic_inc(&base->block->open_count);
2822 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
2823 rc = -ENODEV;
2824 goto unlock;
2825 }
2826
2827 if (!try_module_get(base->discipline->owner)) {
2828 rc = -EINVAL;
2829 goto unlock;
2830 }
2831
2832 if (dasd_probeonly) {
2833 dev_info(&base->cdev->dev,
2834 "Accessing the DASD failed because it is in "
2835 "probeonly mode\n");
2836 rc = -EPERM;
2837 goto out;
2838 }
2839
2840 if (base->state <= DASD_STATE_BASIC) {
2841 DBF_DEV_EVENT(DBF_ERR, base, " %s",
2842 " Cannot open unrecognized device");
2843 rc = -ENODEV;
2844 goto out;
2845 }
2846
2847 if ((mode & FMODE_WRITE) &&
2848 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
2849 (base->features & DASD_FEATURE_READONLY))) {
2850 rc = -EROFS;
2851 goto out;
2852 }
2853
2854 dasd_put_device(base);
2855 return 0;
2856
2857 out:
2858 module_put(base->discipline->owner);
2859 unlock:
2860 atomic_dec(&base->block->open_count);
2861 dasd_put_device(base);
2862 return rc;
2863 }
2864
2865 static int dasd_release(struct gendisk *disk, fmode_t mode)
2866 {
2867 struct dasd_device *base;
2868
2869 base = dasd_device_from_gendisk(disk);
2870 if (!base)
2871 return -ENODEV;
2872
2873 atomic_dec(&base->block->open_count);
2874 module_put(base->discipline->owner);
2875 dasd_put_device(base);
2876 return 0;
2877 }
2878
2879 /*
2880 * Return disk geometry.
2881 */
2882 static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
2883 {
2884 struct dasd_device *base;
2885
2886 base = dasd_device_from_gendisk(bdev->bd_disk);
2887 if (!base)
2888 return -ENODEV;
2889
2890 if (!base->discipline ||
2891 !base->discipline->fill_geometry) {
2892 dasd_put_device(base);
2893 return -EINVAL;
2894 }
2895 base->discipline->fill_geometry(base->block, geo);
2896 geo->start = get_start_sect(bdev) >> base->block->s2b_shift;
2897 dasd_put_device(base);
2898 return 0;
2899 }
2900
2901 const struct block_device_operations
2902 dasd_device_operations = {
2903 .owner = THIS_MODULE,
2904 .open = dasd_open,
2905 .release = dasd_release,
2906 .ioctl = dasd_ioctl,
2907 .compat_ioctl = dasd_ioctl,
2908 .getgeo = dasd_getgeo,
2909 };
2910
2911 /*******************************************************************************
2912 * end of block device operations
2913 */
2914
2915 static void
2916 dasd_exit(void)
2917 {
2918 #ifdef CONFIG_PROC_FS
2919 dasd_proc_exit();
2920 #endif
2921 dasd_eer_exit();
2922 if (dasd_page_cache != NULL) {
2923 kmem_cache_destroy(dasd_page_cache);
2924 dasd_page_cache = NULL;
2925 }
2926 dasd_gendisk_exit();
2927 dasd_devmap_exit();
2928 if (dasd_debug_area != NULL) {
2929 debug_unregister(dasd_debug_area);
2930 dasd_debug_area = NULL;
2931 }
2932 dasd_statistics_removeroot();
2933 }
2934
2935 /*
2936 * SECTION: common functions for ccw_driver use
2937 */
2938
2939 /*
2940 * Is the device read-only?
2941 * Note that this function does not report the setting of the
2942 * readonly device attribute, but how it is configured in z/VM.
2943 */
2944 int dasd_device_is_ro(struct dasd_device *device)
2945 {
2946 struct ccw_dev_id dev_id;
2947 struct diag210 diag_data;
2948 int rc;
2949
2950 if (!MACHINE_IS_VM)
2951 return 0;
2952 ccw_device_get_id(device->cdev, &dev_id);
2953 memset(&diag_data, 0, sizeof(diag_data));
2954 diag_data.vrdcdvno = dev_id.devno;
2955 diag_data.vrdclen = sizeof(diag_data);
2956 rc = diag210(&diag_data);
2957 if (rc == 0 || rc == 2) {
2958 return diag_data.vrdcvfla & 0x80;
2959 } else {
2960 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
2961 dev_id.devno, rc);
2962 return 0;
2963 }
2964 }
2965 EXPORT_SYMBOL_GPL(dasd_device_is_ro);
2966
2967 static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
2968 {
2969 struct ccw_device *cdev = data;
2970 int ret;
2971
2972 ret = ccw_device_set_online(cdev);
2973 if (ret)
2974 pr_warning("%s: Setting the DASD online failed with rc=%d\n",
2975 dev_name(&cdev->dev), ret);
2976 }
2977
2978 /*
2979 * Initial attempt at a probe function. this can be simplified once
2980 * the other detection code is gone.
2981 */
2982 int dasd_generic_probe(struct ccw_device *cdev,
2983 struct dasd_discipline *discipline)
2984 {
2985 int ret;
2986
2987 ret = dasd_add_sysfs_files(cdev);
2988 if (ret) {
2989 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
2990 "dasd_generic_probe: could not add "
2991 "sysfs entries");
2992 return ret;
2993 }
2994 cdev->handler = &dasd_int_handler;
2995
2996 /*
2997 * Automatically online either all dasd devices (dasd_autodetect)
2998 * or all devices specified with dasd= parameters during
2999 * initial probe.
3000 */
3001 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
3002 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
3003 async_schedule(dasd_generic_auto_online, cdev);
3004 return 0;
3005 }
3006
3007 /*
3008 * This will one day be called from a global not_oper handler.
3009 * It is also used by driver_unregister during module unload.
3010 */
3011 void dasd_generic_remove(struct ccw_device *cdev)
3012 {
3013 struct dasd_device *device;
3014 struct dasd_block *block;
3015
3016 cdev->handler = NULL;
3017
3018 dasd_remove_sysfs_files(cdev);
3019 device = dasd_device_from_cdev(cdev);
3020 if (IS_ERR(device))
3021 return;
3022 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3023 /* Already doing offline processing */
3024 dasd_put_device(device);
3025 return;
3026 }
3027 /*
3028 * This device is removed unconditionally. Set offline
3029 * flag to prevent dasd_open from opening it while it is
3030 * no quite down yet.
3031 */
3032 dasd_set_target_state(device, DASD_STATE_NEW);
3033 /* dasd_delete_device destroys the device reference. */
3034 block = device->block;
3035 dasd_delete_device(device);
3036 /*
3037 * life cycle of block is bound to device, so delete it after
3038 * device was safely removed
3039 */
3040 if (block)
3041 dasd_free_block(block);
3042 }
3043
3044 /*
3045 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
3046 * the device is detected for the first time and is supposed to be used
3047 * or the user has started activation through sysfs.
3048 */
3049 int dasd_generic_set_online(struct ccw_device *cdev,
3050 struct dasd_discipline *base_discipline)
3051 {
3052 struct dasd_discipline *discipline;
3053 struct dasd_device *device;
3054 int rc;
3055
3056 /* first online clears initial online feature flag */
3057 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
3058 device = dasd_create_device(cdev);
3059 if (IS_ERR(device))
3060 return PTR_ERR(device);
3061
3062 discipline = base_discipline;
3063 if (device->features & DASD_FEATURE_USEDIAG) {
3064 if (!dasd_diag_discipline_pointer) {
3065 pr_warning("%s Setting the DASD online failed because "
3066 "of missing DIAG discipline\n",
3067 dev_name(&cdev->dev));
3068 dasd_delete_device(device);
3069 return -ENODEV;
3070 }
3071 discipline = dasd_diag_discipline_pointer;
3072 }
3073 if (!try_module_get(base_discipline->owner)) {
3074 dasd_delete_device(device);
3075 return -EINVAL;
3076 }
3077 if (!try_module_get(discipline->owner)) {
3078 module_put(base_discipline->owner);
3079 dasd_delete_device(device);
3080 return -EINVAL;
3081 }
3082 device->base_discipline = base_discipline;
3083 device->discipline = discipline;
3084
3085 /* check_device will allocate block device if necessary */
3086 rc = discipline->check_device(device);
3087 if (rc) {
3088 pr_warning("%s Setting the DASD online with discipline %s "
3089 "failed with rc=%i\n",
3090 dev_name(&cdev->dev), discipline->name, rc);
3091 module_put(discipline->owner);
3092 module_put(base_discipline->owner);
3093 dasd_delete_device(device);
3094 return rc;
3095 }
3096
3097 dasd_set_target_state(device, DASD_STATE_ONLINE);
3098 if (device->state <= DASD_STATE_KNOWN) {
3099 pr_warning("%s Setting the DASD online failed because of a "
3100 "missing discipline\n", dev_name(&cdev->dev));
3101 rc = -ENODEV;
3102 dasd_set_target_state(device, DASD_STATE_NEW);
3103 if (device->block)
3104 dasd_free_block(device->block);
3105 dasd_delete_device(device);
3106 } else
3107 pr_debug("dasd_generic device %s found\n",
3108 dev_name(&cdev->dev));
3109
3110 wait_event(dasd_init_waitq, _wait_for_device(device));
3111
3112 dasd_put_device(device);
3113 return rc;
3114 }
3115
3116 int dasd_generic_set_offline(struct ccw_device *cdev)
3117 {
3118 struct dasd_device *device;
3119 struct dasd_block *block;
3120 int max_count, open_count;
3121
3122 device = dasd_device_from_cdev(cdev);
3123 if (IS_ERR(device))
3124 return PTR_ERR(device);
3125 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3126 /* Already doing offline processing */
3127 dasd_put_device(device);
3128 return 0;
3129 }
3130 /*
3131 * We must make sure that this device is currently not in use.
3132 * The open_count is increased for every opener, that includes
3133 * the blkdev_get in dasd_scan_partitions. We are only interested
3134 * in the other openers.
3135 */
3136 if (device->block) {
3137 max_count = device->block->bdev ? 0 : -1;
3138 open_count = atomic_read(&device->block->open_count);
3139 if (open_count > max_count) {
3140 if (open_count > 0)
3141 pr_warning("%s: The DASD cannot be set offline "
3142 "with open count %i\n",
3143 dev_name(&cdev->dev), open_count);
3144 else
3145 pr_warning("%s: The DASD cannot be set offline "
3146 "while it is in use\n",
3147 dev_name(&cdev->dev));
3148 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3149 dasd_put_device(device);
3150 return -EBUSY;
3151 }
3152 }
3153 dasd_set_target_state(device, DASD_STATE_NEW);
3154 /* dasd_delete_device destroys the device reference. */
3155 block = device->block;
3156 dasd_delete_device(device);
3157 /*
3158 * life cycle of block is bound to device, so delete it after
3159 * device was safely removed
3160 */
3161 if (block)
3162 dasd_free_block(block);
3163 return 0;
3164 }
3165
3166 int dasd_generic_last_path_gone(struct dasd_device *device)
3167 {
3168 struct dasd_ccw_req *cqr;
3169
3170 dev_warn(&device->cdev->dev, "No operational channel path is left "
3171 "for the device\n");
3172 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
3173 /* First of all call extended error reporting. */
3174 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3175
3176 if (device->state < DASD_STATE_BASIC)
3177 return 0;
3178 /* Device is active. We want to keep it. */
3179 list_for_each_entry(cqr, &device->ccw_queue, devlist)
3180 if ((cqr->status == DASD_CQR_IN_IO) ||
3181 (cqr->status == DASD_CQR_CLEAR_PENDING)) {
3182 cqr->status = DASD_CQR_QUEUED;
3183 cqr->retries++;
3184 }
3185 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
3186 dasd_device_clear_timer(device);
3187 dasd_schedule_device_bh(device);
3188 return 1;
3189 }
3190 EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
3191
3192 int dasd_generic_path_operational(struct dasd_device *device)
3193 {
3194 dev_info(&device->cdev->dev, "A channel path to the device has become "
3195 "operational\n");
3196 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
3197 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
3198 if (device->stopped & DASD_UNRESUMED_PM) {
3199 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
3200 dasd_restore_device(device);
3201 return 1;
3202 }
3203 dasd_schedule_device_bh(device);
3204 if (device->block)
3205 dasd_schedule_block_bh(device->block);
3206 return 1;
3207 }
3208 EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
3209
3210 int dasd_generic_notify(struct ccw_device *cdev, int event)
3211 {
3212 struct dasd_device *device;
3213 int ret;
3214
3215 device = dasd_device_from_cdev_locked(cdev);
3216 if (IS_ERR(device))
3217 return 0;
3218 ret = 0;
3219 switch (event) {
3220 case CIO_GONE:
3221 case CIO_BOXED:
3222 case CIO_NO_PATH:
3223 device->path_data.opm = 0;
3224 device->path_data.ppm = 0;
3225 device->path_data.npm = 0;
3226 ret = dasd_generic_last_path_gone(device);
3227 break;
3228 case CIO_OPER:
3229 ret = 1;
3230 if (device->path_data.opm)
3231 ret = dasd_generic_path_operational(device);
3232 break;
3233 }
3234 dasd_put_device(device);
3235 return ret;
3236 }
3237
3238 void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
3239 {
3240 int chp;
3241 __u8 oldopm, eventlpm;
3242 struct dasd_device *device;
3243
3244 device = dasd_device_from_cdev_locked(cdev);
3245 if (IS_ERR(device))
3246 return;
3247 for (chp = 0; chp < 8; chp++) {
3248 eventlpm = 0x80 >> chp;
3249 if (path_event[chp] & PE_PATH_GONE) {
3250 oldopm = device->path_data.opm;
3251 device->path_data.opm &= ~eventlpm;
3252 device->path_data.ppm &= ~eventlpm;
3253 device->path_data.npm &= ~eventlpm;
3254 if (oldopm && !device->path_data.opm)
3255 dasd_generic_last_path_gone(device);
3256 }
3257 if (path_event[chp] & PE_PATH_AVAILABLE) {
3258 device->path_data.opm &= ~eventlpm;
3259 device->path_data.ppm &= ~eventlpm;
3260 device->path_data.npm &= ~eventlpm;
3261 device->path_data.tbvpm |= eventlpm;
3262 dasd_schedule_device_bh(device);
3263 }
3264 if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) {
3265 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3266 "Pathgroup re-established\n");
3267 if (device->discipline->kick_validate)
3268 device->discipline->kick_validate(device);
3269 }
3270 }
3271 dasd_put_device(device);
3272 }
3273 EXPORT_SYMBOL_GPL(dasd_generic_path_event);
3274
3275 int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
3276 {
3277 if (!device->path_data.opm && lpm) {
3278 device->path_data.opm = lpm;
3279 dasd_generic_path_operational(device);
3280 } else
3281 device->path_data.opm |= lpm;
3282 return 0;
3283 }
3284 EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
3285
3286
3287 int dasd_generic_pm_freeze(struct ccw_device *cdev)
3288 {
3289 struct dasd_ccw_req *cqr, *n;
3290 int rc;
3291 struct list_head freeze_queue;
3292 struct dasd_device *device = dasd_device_from_cdev(cdev);
3293
3294 if (IS_ERR(device))
3295 return PTR_ERR(device);
3296
3297 /* mark device as suspended */
3298 set_bit(DASD_FLAG_SUSPENDED, &device->flags);
3299
3300 if (device->discipline->freeze)
3301 rc = device->discipline->freeze(device);
3302
3303 /* disallow new I/O */
3304 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
3305 /* clear active requests */
3306 INIT_LIST_HEAD(&freeze_queue);
3307 spin_lock_irq(get_ccwdev_lock(cdev));
3308 rc = 0;
3309 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
3310 /* Check status and move request to flush_queue */
3311 if (cqr->status == DASD_CQR_IN_IO) {
3312 rc = device->discipline->term_IO(cqr);
3313 if (rc) {
3314 /* unable to terminate requeust */
3315 dev_err(&device->cdev->dev,
3316 "Unable to terminate request %p "
3317 "on suspend\n", cqr);
3318 spin_unlock_irq(get_ccwdev_lock(cdev));
3319 dasd_put_device(device);
3320 return rc;
3321 }
3322 }
3323 list_move_tail(&cqr->devlist, &freeze_queue);
3324 }
3325
3326 spin_unlock_irq(get_ccwdev_lock(cdev));
3327
3328 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
3329 wait_event(dasd_flush_wq,
3330 (cqr->status != DASD_CQR_CLEAR_PENDING));
3331 if (cqr->status == DASD_CQR_CLEARED)
3332 cqr->status = DASD_CQR_QUEUED;
3333 }
3334 /* move freeze_queue to start of the ccw_queue */
3335 spin_lock_irq(get_ccwdev_lock(cdev));
3336 list_splice_tail(&freeze_queue, &device->ccw_queue);
3337 spin_unlock_irq(get_ccwdev_lock(cdev));
3338
3339 dasd_put_device(device);
3340 return rc;
3341 }
3342 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
3343
3344 int dasd_generic_restore_device(struct ccw_device *cdev)
3345 {
3346 struct dasd_device *device = dasd_device_from_cdev(cdev);
3347 int rc = 0;
3348
3349 if (IS_ERR(device))
3350 return PTR_ERR(device);
3351
3352 /* allow new IO again */
3353 dasd_device_remove_stop_bits(device,
3354 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
3355
3356 dasd_schedule_device_bh(device);
3357
3358 /*
3359 * call discipline restore function
3360 * if device is stopped do nothing e.g. for disconnected devices
3361 */
3362 if (device->discipline->restore && !(device->stopped))
3363 rc = device->discipline->restore(device);
3364 if (rc || device->stopped)
3365 /*
3366 * if the resume failed for the DASD we put it in
3367 * an UNRESUMED stop state
3368 */
3369 device->stopped |= DASD_UNRESUMED_PM;
3370
3371 if (device->block)
3372 dasd_schedule_block_bh(device->block);
3373
3374 clear_bit(DASD_FLAG_SUSPENDED, &device->flags);
3375 dasd_put_device(device);
3376 return 0;
3377 }
3378 EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
3379
3380 static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
3381 void *rdc_buffer,
3382 int rdc_buffer_size,
3383 int magic)
3384 {
3385 struct dasd_ccw_req *cqr;
3386 struct ccw1 *ccw;
3387 unsigned long *idaw;
3388
3389 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
3390
3391 if (IS_ERR(cqr)) {
3392 /* internal error 13 - Allocating the RDC request failed*/
3393 dev_err(&device->cdev->dev,
3394 "An error occurred in the DASD device driver, "
3395 "reason=%s\n", "13");
3396 return cqr;
3397 }
3398
3399 ccw = cqr->cpaddr;
3400 ccw->cmd_code = CCW_CMD_RDC;
3401 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
3402 idaw = (unsigned long *) (cqr->data);
3403 ccw->cda = (__u32)(addr_t) idaw;
3404 ccw->flags = CCW_FLAG_IDA;
3405 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
3406 } else {
3407 ccw->cda = (__u32)(addr_t) rdc_buffer;
3408 ccw->flags = 0;
3409 }
3410
3411 ccw->count = rdc_buffer_size;
3412 cqr->startdev = device;
3413 cqr->memdev = device;
3414 cqr->expires = 10*HZ;
3415 cqr->retries = 256;
3416 cqr->buildclk = get_clock();
3417 cqr->status = DASD_CQR_FILLED;
3418 return cqr;
3419 }
3420
3421
3422 int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
3423 void *rdc_buffer, int rdc_buffer_size)
3424 {
3425 int ret;
3426 struct dasd_ccw_req *cqr;
3427
3428 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
3429 magic);
3430 if (IS_ERR(cqr))
3431 return PTR_ERR(cqr);
3432
3433 ret = dasd_sleep_on(cqr);
3434 dasd_sfree_request(cqr, cqr->memdev);
3435 return ret;
3436 }
3437 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
3438
3439 /*
3440 * In command mode and transport mode we need to look for sense
3441 * data in different places. The sense data itself is allways
3442 * an array of 32 bytes, so we can unify the sense data access
3443 * for both modes.
3444 */
3445 char *dasd_get_sense(struct irb *irb)
3446 {
3447 struct tsb *tsb = NULL;
3448 char *sense = NULL;
3449
3450 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
3451 if (irb->scsw.tm.tcw)
3452 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
3453 irb->scsw.tm.tcw);
3454 if (tsb && tsb->length == 64 && tsb->flags)
3455 switch (tsb->flags & 0x07) {
3456 case 1: /* tsa_iostat */
3457 sense = tsb->tsa.iostat.sense;
3458 break;
3459 case 2: /* tsa_ddpc */
3460 sense = tsb->tsa.ddpc.sense;
3461 break;
3462 default:
3463 /* currently we don't use interrogate data */
3464 break;
3465 }
3466 } else if (irb->esw.esw0.erw.cons) {
3467 sense = irb->ecw;
3468 }
3469 return sense;
3470 }
3471 EXPORT_SYMBOL_GPL(dasd_get_sense);
3472
3473 static int __init dasd_init(void)
3474 {
3475 int rc;
3476
3477 init_waitqueue_head(&dasd_init_waitq);
3478 init_waitqueue_head(&dasd_flush_wq);
3479 init_waitqueue_head(&generic_waitq);
3480
3481 /* register 'common' DASD debug area, used for all DBF_XXX calls */
3482 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
3483 if (dasd_debug_area == NULL) {
3484 rc = -ENOMEM;
3485 goto failed;
3486 }
3487 debug_register_view(dasd_debug_area, &debug_sprintf_view);
3488 debug_set_level(dasd_debug_area, DBF_WARNING);
3489
3490 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
3491
3492 dasd_diag_discipline_pointer = NULL;
3493
3494 dasd_statistics_createroot();
3495
3496 rc = dasd_devmap_init();
3497 if (rc)
3498 goto failed;
3499 rc = dasd_gendisk_init();
3500 if (rc)
3501 goto failed;
3502 rc = dasd_parse();
3503 if (rc)
3504 goto failed;
3505 rc = dasd_eer_init();
3506 if (rc)
3507 goto failed;
3508 #ifdef CONFIG_PROC_FS
3509 rc = dasd_proc_init();
3510 if (rc)
3511 goto failed;
3512 #endif
3513
3514 return 0;
3515 failed:
3516 pr_info("The DASD device driver could not be initialized\n");
3517 dasd_exit();
3518 return rc;
3519 }
3520
3521 module_init(dasd_init);
3522 module_exit(dasd_exit);
3523
3524 EXPORT_SYMBOL(dasd_debug_area);
3525 EXPORT_SYMBOL(dasd_diag_discipline_pointer);
3526
3527 EXPORT_SYMBOL(dasd_add_request_head);
3528 EXPORT_SYMBOL(dasd_add_request_tail);
3529 EXPORT_SYMBOL(dasd_cancel_req);
3530 EXPORT_SYMBOL(dasd_device_clear_timer);
3531 EXPORT_SYMBOL(dasd_block_clear_timer);
3532 EXPORT_SYMBOL(dasd_enable_device);
3533 EXPORT_SYMBOL(dasd_int_handler);
3534 EXPORT_SYMBOL(dasd_kfree_request);
3535 EXPORT_SYMBOL(dasd_kick_device);
3536 EXPORT_SYMBOL(dasd_kmalloc_request);
3537 EXPORT_SYMBOL(dasd_schedule_device_bh);
3538 EXPORT_SYMBOL(dasd_schedule_block_bh);
3539 EXPORT_SYMBOL(dasd_set_target_state);
3540 EXPORT_SYMBOL(dasd_device_set_timer);
3541 EXPORT_SYMBOL(dasd_block_set_timer);
3542 EXPORT_SYMBOL(dasd_sfree_request);
3543 EXPORT_SYMBOL(dasd_sleep_on);
3544 EXPORT_SYMBOL(dasd_sleep_on_immediatly);
3545 EXPORT_SYMBOL(dasd_sleep_on_interruptible);
3546 EXPORT_SYMBOL(dasd_smalloc_request);
3547 EXPORT_SYMBOL(dasd_start_IO);
3548 EXPORT_SYMBOL(dasd_term_IO);
3549
3550 EXPORT_SYMBOL_GPL(dasd_generic_probe);
3551 EXPORT_SYMBOL_GPL(dasd_generic_remove);
3552 EXPORT_SYMBOL_GPL(dasd_generic_notify);
3553 EXPORT_SYMBOL_GPL(dasd_generic_set_online);
3554 EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
3555 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
3556 EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
3557 EXPORT_SYMBOL_GPL(dasd_alloc_block);
3558 EXPORT_SYMBOL_GPL(dasd_free_block);