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[S390] dasd: Prevent deadlock during suspend/resume.
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / s390 / block / dasd.c
CommitLineData
1da177e4
LT		 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>
d41dd122 8 * Copyright IBM Corp. 1999, 2009
1da177e4
LT		 9 */
10
fc19f381
SH		 11#define KMSG_COMPONENT "dasd"
12#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13
3283942b 14#include <linux/kernel_stat.h>
1da177e4
LT		 15#include <linux/kmod.h>
16#include <linux/init.h>
17#include <linux/interrupt.h>
18#include <linux/ctype.h>
19#include <linux/major.h>
20#include <linux/slab.h>
21#include <linux/buffer_head.h>
a885c8c4 22#include <linux/hdreg.h>
f3445a1a 23#include <linux/async.h>
9eb25122 24#include <linux/mutex.h>
1da177e4
LT		 25
26#include <asm/ccwdev.h>
27#include <asm/ebcdic.h>
28#include <asm/idals.h>
f3eb5384 29#include <asm/itcw.h>
33b62a30 30#include <asm/diag.h>
1da177e4
LT		 31
32/* This is ugly... */
33#define PRINTK_HEADER "dasd:"
34
35#include "dasd_int.h"
36/*
37 * SECTION: Constant definitions to be used within this file
38 */
39#define DASD_CHANQ_MAX_SIZE 4
40
1c1e093c
SW		 41#define DASD_SLEEPON_START_TAG (void *) 1
42#define DASD_SLEEPON_END_TAG (void *) 2
43
1da177e4
LT		 44/*
45 * SECTION: exported variables of dasd.c
46 */
47debug_info_t *dasd_debug_area;
48struct dasd_discipline *dasd_diag_discipline_pointer;
2b67fc46 49void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
1da177e4
LT		 50
51MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
52MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
53 " Copyright 2000 IBM Corporation");
54MODULE_SUPPORTED_DEVICE("dasd");
1da177e4
LT		 55MODULE_LICENSE("GPL");
56
57/*
58 * SECTION: prototypes for static functions of dasd.c
59 */
8e09f215
SW		 60static int dasd_alloc_queue(struct dasd_block *);
61static void dasd_setup_queue(struct dasd_block *);
62static void dasd_free_queue(struct dasd_block *);
63static void dasd_flush_request_queue(struct dasd_block *);
64static int dasd_flush_block_queue(struct dasd_block *);
65static void dasd_device_tasklet(struct dasd_device *);
66static void dasd_block_tasklet(struct dasd_block *);
4927b3f7 67static void do_kick_device(struct work_struct *);
d41dd122 68static void do_restore_device(struct work_struct *);
501183f2 69static void do_reload_device(struct work_struct *);
8e09f215 70static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
48cae885
SW		 71static void dasd_device_timeout(unsigned long);
72static void dasd_block_timeout(unsigned long);
eb6e199b 73static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *);
1da177e4
LT		 74
75/*
76 * SECTION: Operations on the device structure.
77 */
78static wait_queue_head_t dasd_init_waitq;
8f61701b 79static wait_queue_head_t dasd_flush_wq;
c80ee724 80static wait_queue_head_t generic_waitq;
1da177e4
LT		 81
82/*
83 * Allocate memory for a new device structure.
84 */
8e09f215 85struct dasd_device *dasd_alloc_device(void)
1da177e4
LT		 86{
87 struct dasd_device *device;
88
8e09f215
SW		 89 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC);
90 if (!device)
1da177e4 91 return ERR_PTR(-ENOMEM);
1da177e4
LT		 92
93 /* Get two pages for normal block device operations. */
94 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
8e09f215 95 if (!device->ccw_mem) {
1da177e4
LT		 96 kfree(device);
97 return ERR_PTR(-ENOMEM);
98 }
99 /* Get one page for error recovery. */
100 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
8e09f215 101 if (!device->erp_mem) {
1da177e4
LT		 102 free_pages((unsigned long) device->ccw_mem, 1);
103 kfree(device);
104 return ERR_PTR(-ENOMEM);
105 }
106
107 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
108 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
109 spin_lock_init(&device->mem_lock);
8e09f215 110 atomic_set(&device->tasklet_scheduled, 0);
138c014d 111 tasklet_init(&device->tasklet,
8e09f215 112 (void (*)(unsigned long)) dasd_device_tasklet,
1da177e4
LT		 113 (unsigned long) device);
114 INIT_LIST_HEAD(&device->ccw_queue);
115 init_timer(&device->timer);
48cae885
SW		 116 device->timer.function = dasd_device_timeout;
117 device->timer.data = (unsigned long) device;
4927b3f7 118 INIT_WORK(&device->kick_work, do_kick_device);
d41dd122 119 INIT_WORK(&device->restore_device, do_restore_device);
501183f2 120 INIT_WORK(&device->reload_device, do_reload_device);
1da177e4
LT		 121 device->state = DASD_STATE_NEW;
122 device->target = DASD_STATE_NEW;
9eb25122 123 mutex_init(&device->state_mutex);
1da177e4
LT		 124
125 return device;
126}
127
128/*
129 * Free memory of a device structure.
130 */
8e09f215 131void dasd_free_device(struct dasd_device *device)
1da177e4 132{
17fd682e 133 kfree(device->private);
1da177e4
LT		 134 free_page((unsigned long) device->erp_mem);
135 free_pages((unsigned long) device->ccw_mem, 1);
136 kfree(device);
137}
138
8e09f215
SW		 139/*
140 * Allocate memory for a new device structure.
141 */
142struct dasd_block *dasd_alloc_block(void)
143{
144 struct dasd_block *block;
145
146 block = kzalloc(sizeof(*block), GFP_ATOMIC);
147 if (!block)
148 return ERR_PTR(-ENOMEM);
149 /* open_count = 0 means device online but not in use */
150 atomic_set(&block->open_count, -1);
151
152 spin_lock_init(&block->request_queue_lock);
153 atomic_set(&block->tasklet_scheduled, 0);
154 tasklet_init(&block->tasklet,
155 (void (*)(unsigned long)) dasd_block_tasklet,
156 (unsigned long) block);
157 INIT_LIST_HEAD(&block->ccw_queue);
158 spin_lock_init(&block->queue_lock);
159 init_timer(&block->timer);
48cae885
SW		 160 block->timer.function = dasd_block_timeout;
161 block->timer.data = (unsigned long) block;
8e09f215
SW		 162
163 return block;
164}
165
166/*
167 * Free memory of a device structure.
168 */
169void dasd_free_block(struct dasd_block *block)
170{
171 kfree(block);
172}
173
1da177e4
LT		 174/*
175 * Make a new device known to the system.
176 */
8e09f215 177static int dasd_state_new_to_known(struct dasd_device *device)
1da177e4
LT		 178{
179 int rc;
180
181 /*
138c014d 182 * As long as the device is not in state DASD_STATE_NEW we want to
1da177e4
LT		 183 * keep the reference count > 0.
184 */
185 dasd_get_device(device);
186
8e09f215
SW		 187 if (device->block) {
188 rc = dasd_alloc_queue(device->block);
189 if (rc) {
190 dasd_put_device(device);
191 return rc;
192 }
1da177e4 193 }
1da177e4
LT		 194 device->state = DASD_STATE_KNOWN;
195 return 0;
196}
197
198/*
199 * Let the system forget about a device.
200 */
8e09f215 201static int dasd_state_known_to_new(struct dasd_device *device)
1da177e4 202{
20c64468
SW		 203 /* Disable extended error reporting for this device. */
204 dasd_eer_disable(device);
1da177e4 205 /* Forget the discipline information. */
8e09f215
SW		 206 if (device->discipline) {
207 if (device->discipline->uncheck_device)
208 device->discipline->uncheck_device(device);
aa88861f 209 module_put(device->discipline->owner);
8e09f215 210 }
1da177e4 211 device->discipline = NULL;
aa88861f
PO		 212 if (device->base_discipline)
213 module_put(device->base_discipline->owner);
214 device->base_discipline = NULL;
1da177e4
LT		 215 device->state = DASD_STATE_NEW;
216
8e09f215
SW		 217 if (device->block)
218 dasd_free_queue(device->block);
1da177e4
LT		 219
220 /* Give up reference we took in dasd_state_new_to_known. */
221 dasd_put_device(device);
8f61701b 222 return 0;
1da177e4
LT		 223}
224
225/*
226 * Request the irq line for the device.
227 */
8e09f215 228static int dasd_state_known_to_basic(struct dasd_device *device)
1da177e4
LT		 229{
230 int rc;
231
232 /* Allocate and register gendisk structure. */
8e09f215
SW		 233 if (device->block) {
234 rc = dasd_gendisk_alloc(device->block);
235 if (rc)
236 return rc;
237 }
1da177e4 238 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
fc19f381 239 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1,
8e09f215 240 8 * sizeof(long));
1da177e4 241 debug_register_view(device->debug_area, &debug_sprintf_view);
b0035f12 242 debug_set_level(device->debug_area, DBF_WARNING);
1da177e4
LT		 243 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
244
245 device->state = DASD_STATE_BASIC;
246 return 0;
247}
248
249/*
250 * Release the irq line for the device. Terminate any running i/o.
251 */
8e09f215 252static int dasd_state_basic_to_known(struct dasd_device *device)
1da177e4 253{
8f61701b 254 int rc;
8e09f215
SW		 255 if (device->block) {
256 dasd_gendisk_free(device->block);
257 dasd_block_clear_timer(device->block);
258 }
259 rc = dasd_flush_device_queue(device);
8f61701b
HH		 260 if (rc)
261 return rc;
8e09f215 262 dasd_device_clear_timer(device);
8f61701b 263
1da177e4
LT		 264 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
265 if (device->debug_area != NULL) {
266 debug_unregister(device->debug_area);
267 device->debug_area = NULL;
268 }
269 device->state = DASD_STATE_KNOWN;
8f61701b 270 return 0;
1da177e4
LT		 271}
272
273/*
274 * Do the initial analysis. The do_analysis function may return
275 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
276 * until the discipline decides to continue the startup sequence
277 * by calling the function dasd_change_state. The eckd disciplines
278 * uses this to start a ccw that detects the format. The completion
279 * interrupt for this detection ccw uses the kernel event daemon to
280 * trigger the call to dasd_change_state. All this is done in the
281 * discipline code, see dasd_eckd.c.
90f0094d
HH		 282 * After the analysis ccw is done (do_analysis returned 0) the block
283 * device is setup.
284 * In case the analysis returns an error, the device setup is stopped
285 * (a fake disk was already added to allow formatting).
1da177e4 286 */
8e09f215 287static int dasd_state_basic_to_ready(struct dasd_device *device)
1da177e4
LT		 288{
289 int rc;
8e09f215 290 struct dasd_block *block;
1da177e4
LT		 291
292 rc = 0;
8e09f215 293 block = device->block;
90f0094d 294 /* make disk known with correct capacity */
8e09f215
SW		 295 if (block) {
296 if (block->base->discipline->do_analysis != NULL)
297 rc = block->base->discipline->do_analysis(block);
298 if (rc) {
299 if (rc != -EAGAIN)
300 device->state = DASD_STATE_UNFMT;
301 return rc;
302 }
303 dasd_setup_queue(block);
304 set_capacity(block->gdp,
305 block->blocks << block->s2b_shift);
306 device->state = DASD_STATE_READY;
307 rc = dasd_scan_partitions(block);
308 if (rc)
309 device->state = DASD_STATE_BASIC;
310 } else {
311 device->state = DASD_STATE_READY;
312 }
90f0094d 313 return rc;
1da177e4
LT		 314}
315
316/*
317 * Remove device from block device layer. Destroy dirty buffers.
318 * Forget format information. Check if the target level is basic
319 * and if it is create fake disk for formatting.
320 */
8e09f215 321static int dasd_state_ready_to_basic(struct dasd_device *device)
1da177e4 322{
8f61701b
HH		 323 int rc;
324
1da177e4 325 device->state = DASD_STATE_BASIC;
8e09f215
SW		 326 if (device->block) {
327 struct dasd_block *block = device->block;
328 rc = dasd_flush_block_queue(block);
329 if (rc) {
330 device->state = DASD_STATE_READY;
331 return rc;
332 }
8e09f215 333 dasd_flush_request_queue(block);
b695adfa 334 dasd_destroy_partitions(block);
8e09f215
SW		 335 block->blocks = 0;
336 block->bp_block = 0;
337 block->s2b_shift = 0;
338 }
8f61701b 339 return 0;
1da177e4
LT		 340}
341
90f0094d
HH		 342/*
343 * Back to basic.
344 */
8e09f215 345static int dasd_state_unfmt_to_basic(struct dasd_device *device)
90f0094d
HH		 346{
347 device->state = DASD_STATE_BASIC;
8f61701b 348 return 0;
90f0094d
HH		 349}
350
1da177e4
LT		 351/*
352 * Make the device online and schedule the bottom half to start
353 * the requeueing of requests from the linux request queue to the
354 * ccw queue.
355 */
8f61701b 356static int
1da177e4
LT		 357dasd_state_ready_to_online(struct dasd_device * device)
358{
8e09f215 359 int rc;
1301809b
SW		 360 struct gendisk *disk;
361 struct disk_part_iter piter;
362 struct hd_struct *part;
8e09f215
SW		 363
364 if (device->discipline->ready_to_online) {
365 rc = device->discipline->ready_to_online(device);
366 if (rc)
367 return rc;
368 }
1da177e4 369 device->state = DASD_STATE_ONLINE;
1301809b 370 if (device->block) {
8e09f215 371 dasd_schedule_block_bh(device->block);
1301809b
SW		 372 disk = device->block->bdev->bd_disk;
373 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
374 while ((part = disk_part_iter_next(&piter)))
375 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
376 disk_part_iter_exit(&piter);
377 }
1da177e4
LT		 378 return 0;
379}
380
381/*
382 * Stop the requeueing of requests again.
383 */
8e09f215 384static int dasd_state_online_to_ready(struct dasd_device *device)
1da177e4 385{
8e09f215 386 int rc;
1301809b
SW		 387 struct gendisk *disk;
388 struct disk_part_iter piter;
389 struct hd_struct *part;
8e09f215
SW		 390
391 if (device->discipline->online_to_ready) {
392 rc = device->discipline->online_to_ready(device);
393 if (rc)
394 return rc;
395 }
1da177e4 396 device->state = DASD_STATE_READY;
1301809b
SW		 397 if (device->block) {
398 disk = device->block->bdev->bd_disk;
399 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
400 while ((part = disk_part_iter_next(&piter)))
401 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
402 disk_part_iter_exit(&piter);
403 }
8f61701b 404 return 0;
1da177e4
LT		 405}
406
407/*
408 * Device startup state changes.
409 */
8e09f215 410static int dasd_increase_state(struct dasd_device *device)
1da177e4
LT		 411{
412 int rc;
413
414 rc = 0;
415 if (device->state == DASD_STATE_NEW &&
416 device->target >= DASD_STATE_KNOWN)
417 rc = dasd_state_new_to_known(device);
418
419 if (!rc &&
420 device->state == DASD_STATE_KNOWN &&
421 device->target >= DASD_STATE_BASIC)
422 rc = dasd_state_known_to_basic(device);
423
424 if (!rc &&
425 device->state == DASD_STATE_BASIC &&
426 device->target >= DASD_STATE_READY)
427 rc = dasd_state_basic_to_ready(device);
428
39ccf95e
HH		 429 if (!rc &&
430 device->state == DASD_STATE_UNFMT &&
431 device->target > DASD_STATE_UNFMT)
432 rc = -EPERM;
433
1da177e4
LT		 434 if (!rc &&
435 device->state == DASD_STATE_READY &&
436 device->target >= DASD_STATE_ONLINE)
437 rc = dasd_state_ready_to_online(device);
438
439 return rc;
440}
441
442/*
443 * Device shutdown state changes.
444 */
8e09f215 445static int dasd_decrease_state(struct dasd_device *device)
1da177e4 446{
8f61701b
HH		 447 int rc;
448
449 rc = 0;
1da177e4
LT		 450 if (device->state == DASD_STATE_ONLINE &&
451 device->target <= DASD_STATE_READY)
8f61701b 452 rc = dasd_state_online_to_ready(device);
138c014d 453
8f61701b
HH		 454 if (!rc &&
455 device->state == DASD_STATE_READY &&
1da177e4 456 device->target <= DASD_STATE_BASIC)
8f61701b 457 rc = dasd_state_ready_to_basic(device);
90f0094d 458
8f61701b
HH		 459 if (!rc &&
460 device->state == DASD_STATE_UNFMT &&
90f0094d 461 device->target <= DASD_STATE_BASIC)
8f61701b 462 rc = dasd_state_unfmt_to_basic(device);
90f0094d 463
8f61701b
HH		 464 if (!rc &&
465 device->state == DASD_STATE_BASIC &&
1da177e4 466 device->target <= DASD_STATE_KNOWN)
8f61701b 467 rc = dasd_state_basic_to_known(device);
138c014d 468
8f61701b
HH		 469 if (!rc &&
470 device->state == DASD_STATE_KNOWN &&
1da177e4 471 device->target <= DASD_STATE_NEW)
8f61701b 472 rc = dasd_state_known_to_new(device);
1da177e4 473
8f61701b 474 return rc;
1da177e4
LT		 475}
476
477/*
478 * This is the main startup/shutdown routine.
479 */
8e09f215 480static void dasd_change_state(struct dasd_device *device)
1da177e4 481{
181d9522 482 int rc;
1da177e4
LT		 483
484 if (device->state == device->target)
485 /* Already where we want to go today... */
486 return;
487 if (device->state < device->target)
488 rc = dasd_increase_state(device);
489 else
490 rc = dasd_decrease_state(device);
181d9522
SO		 491 if (rc == -EAGAIN)
492 return;
493 if (rc)
494 device->target = device->state;
1da177e4 495
9eb25122 496 if (device->state == device->target)
1da177e4 497 wake_up(&dasd_init_waitq);
4dfd5c45
HH		 498
499 /* let user-space know that the device status changed */
500 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
1da177e4
LT		 501}
502
503/*
504 * Kick starter for devices that did not complete the startup/shutdown
505 * procedure or were sleeping because of a pending state.
506 * dasd_kick_device will schedule a call do do_kick_device to the kernel
507 * event daemon.
508 */
8e09f215 509static void do_kick_device(struct work_struct *work)
1da177e4 510{
4927b3f7 511 struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
9eb25122 512 mutex_lock(&device->state_mutex);
1da177e4 513 dasd_change_state(device);
9eb25122 514 mutex_unlock(&device->state_mutex);
8e09f215 515 dasd_schedule_device_bh(device);
1da177e4
LT		 516 dasd_put_device(device);
517}
518
8e09f215 519void dasd_kick_device(struct dasd_device *device)
1da177e4
LT		 520{
521 dasd_get_device(device);
522 /* queue call to dasd_kick_device to the kernel event daemon. */
523 schedule_work(&device->kick_work);
524}
525
501183f2
SH		 526/*
527 * dasd_reload_device will schedule a call do do_reload_device to the kernel
528 * event daemon.
529 */
530static void do_reload_device(struct work_struct *work)
531{
532 struct dasd_device *device = container_of(work, struct dasd_device,
533 reload_device);
534 device->discipline->reload(device);
535 dasd_put_device(device);
536}
537
538void dasd_reload_device(struct dasd_device *device)
539{
540 dasd_get_device(device);
541 /* queue call to dasd_reload_device to the kernel event daemon. */
542 schedule_work(&device->reload_device);
543}
544EXPORT_SYMBOL(dasd_reload_device);
545
d41dd122
SH		 546/*
547 * dasd_restore_device will schedule a call do do_restore_device to the kernel
548 * event daemon.
549 */
550static void do_restore_device(struct work_struct *work)
551{
552 struct dasd_device *device = container_of(work, struct dasd_device,
553 restore_device);
554 device->cdev->drv->restore(device->cdev);
555 dasd_put_device(device);
556}
557
558void dasd_restore_device(struct dasd_device *device)
559{
560 dasd_get_device(device);
561 /* queue call to dasd_restore_device to the kernel event daemon. */
562 schedule_work(&device->restore_device);
563}
564
1da177e4
LT		 565/*
566 * Set the target state for a device and starts the state change.
567 */
8e09f215 568void dasd_set_target_state(struct dasd_device *device, int target)
1da177e4 569{
f3445a1a 570 dasd_get_device(device);
9eb25122 571 mutex_lock(&device->state_mutex);
1da177e4
LT		 572 /* If we are in probeonly mode stop at DASD_STATE_READY. */
573 if (dasd_probeonly && target > DASD_STATE_READY)
574 target = DASD_STATE_READY;
575 if (device->target != target) {
9eb25122 576 if (device->state == target)
1da177e4
LT		 577 wake_up(&dasd_init_waitq);
578 device->target = target;
579 }
580 if (device->state != device->target)
581 dasd_change_state(device);
9eb25122
SH		 582 mutex_unlock(&device->state_mutex);
583 dasd_put_device(device);
1da177e4
LT		 584}
585
586/*
587 * Enable devices with device numbers in [from..to].
588 */
8e09f215 589static inline int _wait_for_device(struct dasd_device *device)
1da177e4
LT		 590{
591 return (device->state == device->target);
592}
593
8e09f215 594void dasd_enable_device(struct dasd_device *device)
1da177e4
LT		 595{
596 dasd_set_target_state(device, DASD_STATE_ONLINE);
597 if (device->state <= DASD_STATE_KNOWN)
598 /* No discipline for device found. */
599 dasd_set_target_state(device, DASD_STATE_NEW);
600 /* Now wait for the devices to come up. */
601 wait_event(dasd_init_waitq, _wait_for_device(device));
602}
603
604/*
605 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
606 */
607#ifdef CONFIG_DASD_PROFILE
608
609struct dasd_profile_info_t dasd_global_profile;
610unsigned int dasd_profile_level = DASD_PROFILE_OFF;
611
612/*
613 * Increments counter in global and local profiling structures.
614 */
8e09f215 615#define dasd_profile_counter(value, counter, block) \
1da177e4
LT		 616{ \
617 int index; \
618 for (index = 0; index < 31 && value >> (2+index); index++); \
619 dasd_global_profile.counter[index]++; \
8e09f215 620 block->profile.counter[index]++; \
1da177e4
LT		 621}
622
623/*
624 * Add profiling information for cqr before execution.
625 */
8e09f215
SW		 626static void dasd_profile_start(struct dasd_block *block,
627 struct dasd_ccw_req *cqr,
628 struct request *req)
1da177e4
LT		 629{
630 struct list_head *l;
631 unsigned int counter;
632
633 if (dasd_profile_level != DASD_PROFILE_ON)
634 return;
635
636 /* count the length of the chanq for statistics */
637 counter = 0;
8e09f215 638 list_for_each(l, &block->ccw_queue)
1da177e4
LT		 639 if (++counter >= 31)
640 break;
641 dasd_global_profile.dasd_io_nr_req[counter]++;
8e09f215 642 block->profile.dasd_io_nr_req[counter]++;
1da177e4
LT		 643}
644
645/*
646 * Add profiling information for cqr after execution.
647 */
8e09f215
SW		 648static void dasd_profile_end(struct dasd_block *block,
649 struct dasd_ccw_req *cqr,
650 struct request *req)
1da177e4
LT		 651{
652 long strtime, irqtime, endtime, tottime; /* in microseconds */
653 long tottimeps, sectors;
654
655 if (dasd_profile_level != DASD_PROFILE_ON)
656 return;
657
83096ebf 658 sectors = blk_rq_sectors(req);
1da177e4
LT		 659 if (!cqr->buildclk || !cqr->startclk ||
660 !cqr->stopclk || !cqr->endclk ||
661 !sectors)
662 return;
663
664 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
665 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
666 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
667 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
668 tottimeps = tottime / sectors;
669
670 if (!dasd_global_profile.dasd_io_reqs)
671 memset(&dasd_global_profile, 0,
8e09f215 672 sizeof(struct dasd_profile_info_t));
1da177e4
LT		 673 dasd_global_profile.dasd_io_reqs++;
674 dasd_global_profile.dasd_io_sects += sectors;
675
8e09f215
SW		 676 if (!block->profile.dasd_io_reqs)
677 memset(&block->profile, 0,
678 sizeof(struct dasd_profile_info_t));
679 block->profile.dasd_io_reqs++;
680 block->profile.dasd_io_sects += sectors;
1da177e4 681
8e09f215
SW		 682 dasd_profile_counter(sectors, dasd_io_secs, block);
683 dasd_profile_counter(tottime, dasd_io_times, block);
684 dasd_profile_counter(tottimeps, dasd_io_timps, block);
685 dasd_profile_counter(strtime, dasd_io_time1, block);
686 dasd_profile_counter(irqtime, dasd_io_time2, block);
687 dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, block);
688 dasd_profile_counter(endtime, dasd_io_time3, block);
1da177e4
LT		 689}
690#else
8e09f215
SW		 691#define dasd_profile_start(block, cqr, req) do {} while (0)
692#define dasd_profile_end(block, cqr, req) do {} while (0)
1da177e4
LT		 693#endif /* CONFIG_DASD_PROFILE */
694
695/*
696 * Allocate memory for a channel program with 'cplength' channel
697 * command words and 'datasize' additional space. There are two
698 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
699 * memory and 2) dasd_smalloc_request uses the static ccw memory
700 * that gets allocated for each device.
701 */
68b781fe 702struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
8e09f215
SW		 703 int datasize,
704 struct dasd_device *device)
1da177e4
LT		 705{
706 struct dasd_ccw_req *cqr;
707
708 /* Sanity checks */
68b781fe 709 BUG_ON(datasize > PAGE_SIZE ||
7ac1e877 710 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
1da177e4 711
88abaab4 712 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
1da177e4
LT		 713 if (cqr == NULL)
714 return ERR_PTR(-ENOMEM);
1da177e4
LT		 715 cqr->cpaddr = NULL;
716 if (cplength > 0) {
88abaab4 717 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
1da177e4
LT		 718 GFP_ATOMIC | GFP_DMA);
719 if (cqr->cpaddr == NULL) {
720 kfree(cqr);
721 return ERR_PTR(-ENOMEM);
722 }
1da177e4
LT		 723 }
724 cqr->data = NULL;
725 if (datasize > 0) {
88abaab4 726 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
1da177e4 727 if (cqr->data == NULL) {
17fd682e 728 kfree(cqr->cpaddr);
1da177e4
LT		 729 kfree(cqr);
730 return ERR_PTR(-ENOMEM);
731 }
1da177e4 732 }
68b781fe 733 cqr->magic = magic;
1da177e4
LT		 734 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
735 dasd_get_device(device);
736 return cqr;
737}
738
68b781fe 739struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
8e09f215
SW		 740 int datasize,
741 struct dasd_device *device)
1da177e4
LT		 742{
743 unsigned long flags;
744 struct dasd_ccw_req *cqr;
745 char *data;
746 int size;
747
1da177e4
LT		 748 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
749 if (cplength > 0)
750 size += cplength * sizeof(struct ccw1);
751 if (datasize > 0)
752 size += datasize;
753 spin_lock_irqsave(&device->mem_lock, flags);
754 cqr = (struct dasd_ccw_req *)
755 dasd_alloc_chunk(&device->ccw_chunks, size);
756 spin_unlock_irqrestore(&device->mem_lock, flags);
757 if (cqr == NULL)
758 return ERR_PTR(-ENOMEM);
759 memset(cqr, 0, sizeof(struct dasd_ccw_req));
760 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
761 cqr->cpaddr = NULL;
762 if (cplength > 0) {
763 cqr->cpaddr = (struct ccw1 *) data;
764 data += cplength*sizeof(struct ccw1);
765 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
766 }
767 cqr->data = NULL;
768 if (datasize > 0) {
769 cqr->data = data;
770 memset(cqr->data, 0, datasize);
771 }
68b781fe 772 cqr->magic = magic;
1da177e4
LT		 773 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
774 dasd_get_device(device);
775 return cqr;
776}
777
778/*
779 * Free memory of a channel program. This function needs to free all the
780 * idal lists that might have been created by dasd_set_cda and the
781 * struct dasd_ccw_req itself.
782 */
8e09f215 783void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1da177e4 784{
347a8dc3 785#ifdef CONFIG_64BIT
1da177e4
LT		 786 struct ccw1 *ccw;
787
788 /* Clear any idals used for the request. */
789 ccw = cqr->cpaddr;
790 do {
791 clear_normalized_cda(ccw);
792 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
793#endif
17fd682e
JJ		 794 kfree(cqr->cpaddr);
795 kfree(cqr->data);
1da177e4
LT		 796 kfree(cqr);
797 dasd_put_device(device);
798}
799
8e09f215 800void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1da177e4
LT		 801{
802 unsigned long flags;
803
804 spin_lock_irqsave(&device->mem_lock, flags);
805 dasd_free_chunk(&device->ccw_chunks, cqr);
806 spin_unlock_irqrestore(&device->mem_lock, flags);
807 dasd_put_device(device);
808}
809
810/*
811 * Check discipline magic in cqr.
812 */
8e09f215 813static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
1da177e4
LT		 814{
815 struct dasd_device *device;
816
817 if (cqr == NULL)
818 return -EINVAL;
8e09f215 819 device = cqr->startdev;
1da177e4 820 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
fc19f381 821 DBF_DEV_EVENT(DBF_WARNING, device,
1da177e4
LT		 822 " dasd_ccw_req 0x%08x magic doesn't match"
823 " discipline 0x%08x",
824 cqr->magic,
825 *(unsigned int *) device->discipline->name);
826 return -EINVAL;
827 }
828 return 0;
829}
830
831/*
832 * Terminate the current i/o and set the request to clear_pending.
833 * Timer keeps device runnig.
834 * ccw_device_clear can fail if the i/o subsystem
835 * is in a bad mood.
836 */
8e09f215 837int dasd_term_IO(struct dasd_ccw_req *cqr)
1da177e4
LT		 838{
839 struct dasd_device *device;
840 int retries, rc;
fc19f381 841 char errorstring[ERRORLENGTH];
1da177e4
LT		 842
843 /* Check the cqr */
844 rc = dasd_check_cqr(cqr);
845 if (rc)
846 return rc;
847 retries = 0;
8e09f215 848 device = (struct dasd_device *) cqr->startdev;
1da177e4
LT		 849 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
850 rc = ccw_device_clear(device->cdev, (long) cqr);
851 switch (rc) {
852 case 0: /* termination successful */
c2ba444d 853 cqr->retries--;
8e09f215 854 cqr->status = DASD_CQR_CLEAR_PENDING;
1da177e4 855 cqr->stopclk = get_clock();
8f61701b 856 cqr->starttime = 0;
1da177e4
LT		 857 DBF_DEV_EVENT(DBF_DEBUG, device,
858 "terminate cqr %p successful",
859 cqr);
860 break;
861 case -ENODEV:
862 DBF_DEV_EVENT(DBF_ERR, device, "%s",
863 "device gone, retry");
864 break;
865 case -EIO:
866 DBF_DEV_EVENT(DBF_ERR, device, "%s",
867 "I/O error, retry");
868 break;
869 case -EINVAL:
870 case -EBUSY:
871 DBF_DEV_EVENT(DBF_ERR, device, "%s",
872 "device busy, retry later");
873 break;
874 default:
fc19f381
SH		 875 /* internal error 10 - unknown rc*/
876 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
877 dev_err(&device->cdev->dev, "An error occurred in the "
878 "DASD device driver, reason=%s\n", errorstring);
1da177e4
LT		 879 BUG();
880 break;
881 }
882 retries++;
883 }
8e09f215 884 dasd_schedule_device_bh(device);
1da177e4
LT		 885 return rc;
886}
887
888/*
889 * Start the i/o. This start_IO can fail if the channel is really busy.
890 * In that case set up a timer to start the request later.
891 */
8e09f215 892int dasd_start_IO(struct dasd_ccw_req *cqr)
1da177e4
LT		 893{
894 struct dasd_device *device;
895 int rc;
fc19f381 896 char errorstring[ERRORLENGTH];
1da177e4
LT		 897
898 /* Check the cqr */
899 rc = dasd_check_cqr(cqr);
6cc7f168
SW		 900 if (rc) {
901 cqr->intrc = rc;
1da177e4 902 return rc;
6cc7f168 903 }
8e09f215 904 device = (struct dasd_device *) cqr->startdev;
5a27e60d
SW		 905 if (((cqr->block &&
906 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) ||
907 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) &&
908 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
909 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p "
910 "because of stolen lock", cqr);
911 cqr->status = DASD_CQR_ERROR;
912 cqr->intrc = -EPERM;
913 return -EPERM;
914 }
1da177e4 915 if (cqr->retries < 0) {
fc19f381
SH		 916 /* internal error 14 - start_IO run out of retries */
917 sprintf(errorstring, "14 %p", cqr);
918 dev_err(&device->cdev->dev, "An error occurred in the DASD "
919 "device driver, reason=%s\n", errorstring);
8e09f215 920 cqr->status = DASD_CQR_ERROR;
1da177e4
LT		 921 return -EIO;
922 }
923 cqr->startclk = get_clock();
924 cqr->starttime = jiffies;
925 cqr->retries--;
a4d26c6a
SW		 926 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
927 cqr->lpm &= device->path_data.opm;
928 if (!cqr->lpm)
929 cqr->lpm = device->path_data.opm;
930 }
f3eb5384
SW		 931 if (cqr->cpmode == 1) {
932 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
933 (long) cqr, cqr->lpm);
934 } else {
935 rc = ccw_device_start(device->cdev, cqr->cpaddr,
936 (long) cqr, cqr->lpm, 0);
937 }
1da177e4
LT		 938 switch (rc) {
939 case 0:
940 cqr->status = DASD_CQR_IN_IO;
1da177e4
LT		 941 break;
942 case -EBUSY:
a4d26c6a 943 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1da177e4
LT		 944 "start_IO: device busy, retry later");
945 break;
946 case -ETIMEDOUT:
a4d26c6a 947 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1da177e4
LT		 948 "start_IO: request timeout, retry later");
949 break;
950 case -EACCES:
a4d26c6a
SW		 951 /* -EACCES indicates that the request used only a subset of the
952 * available paths and all these paths are gone. If the lpm of
953 * this request was only a subset of the opm (e.g. the ppm) then
954 * we just do a retry with all available paths.
955 * If we already use the full opm, something is amiss, and we
956 * need a full path verification.
1da177e4 957 */
a4d26c6a
SW		 958 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
959 DBF_DEV_EVENT(DBF_WARNING, device,
960 "start_IO: selected paths gone (%x)",
961 cqr->lpm);
962 } else if (cqr->lpm != device->path_data.opm) {
963 cqr->lpm = device->path_data.opm;
964 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
965 "start_IO: selected paths gone,"
966 " retry on all paths");
967 } else {
968 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
969 "start_IO: all paths in opm gone,"
970 " do path verification");
971 dasd_generic_last_path_gone(device);
972 device->path_data.opm = 0;
973 device->path_data.ppm = 0;
974 device->path_data.npm = 0;
975 device->path_data.tbvpm =
976 ccw_device_get_path_mask(device->cdev);
977 }
1da177e4
LT		 978 break;
979 case -ENODEV:
a4d26c6a 980 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
f3eb5384
SW		 981 "start_IO: -ENODEV device gone, retry");
982 break;
1da177e4 983 case -EIO:
a4d26c6a 984 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
f3eb5384 985 "start_IO: -EIO device gone, retry");
1da177e4 986 break;
d41dd122
SH		 987 case -EINVAL:
988 /* most likely caused in power management context */
a4d26c6a 989 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
d41dd122
SH		 990 "start_IO: -EINVAL device currently "
991 "not accessible");
992 break;
1da177e4 993 default:
fc19f381
SH		 994 /* internal error 11 - unknown rc */
995 snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
996 dev_err(&device->cdev->dev,
997 "An error occurred in the DASD device driver, "
998 "reason=%s\n", errorstring);
1da177e4
LT		 999 BUG();
1000 break;
1001 }
6cc7f168 1002 cqr->intrc = rc;
1da177e4
LT		 1003 return rc;
1004}
1005
1006/*
1007 * Timeout function for dasd devices. This is used for different purposes
1008 * 1) missing interrupt handler for normal operation
1009 * 2) delayed start of request where start_IO failed with -EBUSY
1010 * 3) timeout for missing state change interrupts
1011 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
1012 * DASD_CQR_QUEUED for 2) and 3).
1013 */
8e09f215 1014static void dasd_device_timeout(unsigned long ptr)
1da177e4
LT		 1015{
1016 unsigned long flags;
1017 struct dasd_device *device;
1018
1019 device = (struct dasd_device *) ptr;
1020 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1021 /* re-activate request queue */
eb6e199b 1022 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1da177e4 1023 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
8e09f215 1024 dasd_schedule_device_bh(device);
1da177e4
LT		 1025}
1026
1027/*
1028 * Setup timeout for a device in jiffies.
1029 */
8e09f215 1030void dasd_device_set_timer(struct dasd_device *device, int expires)
1da177e4 1031{
48cae885
SW		 1032 if (expires == 0)
1033 del_timer(&device->timer);
1034 else
1035 mod_timer(&device->timer, jiffies + expires);
1da177e4
LT		 1036}
1037
1038/*
1039 * Clear timeout for a device.
1040 */
8e09f215 1041void dasd_device_clear_timer(struct dasd_device *device)
1da177e4 1042{
48cae885 1043 del_timer(&device->timer);
1da177e4
LT		 1044}
1045
8e09f215
SW		 1046static void dasd_handle_killed_request(struct ccw_device *cdev,
1047 unsigned long intparm)
1da177e4
LT		 1048{
1049 struct dasd_ccw_req *cqr;
1050 struct dasd_device *device;
1051
f16f5843
SW		 1052 if (!intparm)
1053 return;
1da177e4
LT		 1054 cqr = (struct dasd_ccw_req *) intparm;
1055 if (cqr->status != DASD_CQR_IN_IO) {
b8ed5dd5
SH		 1056 DBF_EVENT_DEVID(DBF_DEBUG, cdev,
1057 "invalid status in handle_killed_request: "
1058 "%02x", cqr->status);
1da177e4
LT		 1059 return;
1060 }
1061
589c74d5
SH		 1062 device = dasd_device_from_cdev_locked(cdev);
1063 if (IS_ERR(device)) {
1064 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1065 "unable to get device from cdev");
1066 return;
1067 }
1068
1069 if (!cqr->startdev ||
1070 device != cqr->startdev ||
1071 strncmp(cqr->startdev->discipline->ebcname,
1072 (char *) &cqr->magic, 4)) {
294001a8
SH		 1073 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1074 "invalid device in request");
589c74d5 1075 dasd_put_device(device);
1da177e4
LT		 1076 return;
1077 }
1078
1079 /* Schedule request to be retried. */
1080 cqr->status = DASD_CQR_QUEUED;
1081
8e09f215
SW		 1082 dasd_device_clear_timer(device);
1083 dasd_schedule_device_bh(device);
1da177e4
LT		 1084 dasd_put_device(device);
1085}
1086
8e09f215 1087void dasd_generic_handle_state_change(struct dasd_device *device)
1da177e4 1088{
20c64468
SW		 1089 /* First of all start sense subsystem status request. */
1090 dasd_eer_snss(device);
1091
eb6e199b 1092 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
8e09f215
SW		 1093 dasd_schedule_device_bh(device);
1094 if (device->block)
1095 dasd_schedule_block_bh(device->block);
1da177e4
LT		 1096}
1097
1098/*
1099 * Interrupt handler for "normal" ssch-io based dasd devices.
1100 */
8e09f215
SW		 1101void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1102 struct irb *irb)
1da177e4
LT		 1103{
1104 struct dasd_ccw_req *cqr, *next;
1105 struct dasd_device *device;
1106 unsigned long long now;
1107 int expires;
1da177e4 1108
3283942b 1109 kstat_cpu(smp_processor_id()).irqs[IOINT_DAS]++;
1da177e4
LT		 1110 if (IS_ERR(irb)) {
1111 switch (PTR_ERR(irb)) {
1112 case -EIO:
1da177e4
LT		 1113 break;
1114 case -ETIMEDOUT:
b8ed5dd5
SH		 1115 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1116 "request timed out\n", __func__);
1da177e4
LT		 1117 break;
1118 default:
b8ed5dd5
SH		 1119 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1120 "unknown error %ld\n", __func__,
1121 PTR_ERR(irb));
1da177e4 1122 }
f16f5843 1123 dasd_handle_killed_request(cdev, intparm);
1da177e4
LT		 1124 return;
1125 }
1126
1127 now = get_clock();
8e09f215 1128 cqr = (struct dasd_ccw_req *) intparm;
5a27e60d
SW		 1129 /* check for conditions that should be handled immediately */
1130 if (!cqr ||
1131 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1132 scsw_cstat(&irb->scsw) == 0)) {
a5a0061f
SW		 1133 if (cqr)
1134 memcpy(&cqr->irb, irb, sizeof(*irb));
a00bfd71 1135 device = dasd_device_from_cdev_locked(cdev);
56b86b61
SH		 1136 if (IS_ERR(device))
1137 return;
1138 /* ignore unsolicited interrupts for DIAG discipline */
1139 if (device->discipline == dasd_diag_discipline_pointer) {
1da177e4 1140 dasd_put_device(device);
56b86b61 1141 return;
1da177e4 1142 }
5a27e60d
SW		 1143 device->discipline->dump_sense_dbf(device, irb, "int");
1144 if (device->features & DASD_FEATURE_ERPLOG)
1145 device->discipline->dump_sense(device, cqr, irb);
1146 device->discipline->check_for_device_change(device, cqr, irb);
56b86b61 1147 dasd_put_device(device);
1da177e4 1148 }
5a27e60d
SW		 1149 if (!cqr)
1150 return;
1da177e4 1151
8e09f215
SW		 1152 device = (struct dasd_device *) cqr->startdev;
1153 if (!device ||
1da177e4 1154 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
294001a8
SH		 1155 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1156 "invalid device in request");
1da177e4
LT		 1157 return;
1158 }
1159
1160 /* Check for clear pending */
8e09f215 1161 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
f3eb5384 1162 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
8e09f215
SW		 1163 cqr->status = DASD_CQR_CLEARED;
1164 dasd_device_clear_timer(device);
8f61701b 1165 wake_up(&dasd_flush_wq);
8e09f215 1166 dasd_schedule_device_bh(device);
1da177e4
LT		 1167 return;
1168 }
1169
f3eb5384 1170 /* check status - the request might have been killed by dyn detach */
1da177e4 1171 if (cqr->status != DASD_CQR_IN_IO) {
fc19f381
SH		 1172 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1173 "status %02x", dev_name(&cdev->dev), cqr->status);
1da177e4
LT		 1174 return;
1175 }
fc19f381 1176
8e09f215 1177 next = NULL;
1da177e4 1178 expires = 0;
f3eb5384
SW		 1179 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1180 scsw_cstat(&irb->scsw) == 0) {
8e09f215
SW		 1181 /* request was completed successfully */
1182 cqr->status = DASD_CQR_SUCCESS;
1da177e4
LT		 1183 cqr->stopclk = now;
1184 /* Start first request on queue if possible -> fast_io. */
8e09f215
SW		 1185 if (cqr->devlist.next != &device->ccw_queue) {
1186 next = list_entry(cqr->devlist.next,
1187 struct dasd_ccw_req, devlist);
1da177e4 1188 }
8e09f215 1189 } else { /* error */
6c5f57c7
SH		 1190 /*
1191 * If we don't want complex ERP for this request, then just
1192 * reset this and retry it in the fastpath
8e09f215 1193 */
6c5f57c7 1194 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
8e09f215 1195 cqr->retries > 0) {
a4d26c6a 1196 if (cqr->lpm == device->path_data.opm)
fc19f381
SH		 1197 DBF_DEV_EVENT(DBF_DEBUG, device,
1198 "default ERP in fastpath "
1199 "(%i retries left)",
1200 cqr->retries);
a4d26c6a
SW		 1201 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
1202 cqr->lpm = device->path_data.opm;
8e09f215
SW		 1203 cqr->status = DASD_CQR_QUEUED;
1204 next = cqr;
1205 } else
1da177e4 1206 cqr->status = DASD_CQR_ERROR;
8e09f215
SW		 1207 }
1208 if (next && (next->status == DASD_CQR_QUEUED) &&
1209 (!device->stopped)) {
1210 if (device->discipline->start_IO(next) == 0)
1211 expires = next->expires;
1da177e4
LT		 1212 }
1213 if (expires != 0)
8e09f215 1214 dasd_device_set_timer(device, expires);
1da177e4 1215 else
8e09f215
SW		 1216 dasd_device_clear_timer(device);
1217 dasd_schedule_device_bh(device);
1da177e4
LT		 1218}
1219
a23ed009
SH		 1220enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
1221{
1222 struct dasd_device *device;
1223
1224 device = dasd_device_from_cdev_locked(cdev);
1225
1226 if (IS_ERR(device))
1227 goto out;
1228 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1229 device->state != device->target ||
5a27e60d 1230 !device->discipline->check_for_device_change){
a23ed009
SH		 1231 dasd_put_device(device);
1232 goto out;
1233 }
5a27e60d
SW		 1234 if (device->discipline->dump_sense_dbf)
1235 device->discipline->dump_sense_dbf(device, irb, "uc");
1236 device->discipline->check_for_device_change(device, NULL, irb);
a23ed009
SH		 1237 dasd_put_device(device);
1238out:
1239 return UC_TODO_RETRY;
1240}
1241EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
1242
1da177e4 1243/*
8e09f215
SW		 1244 * If we have an error on a dasd_block layer request then we cancel
1245 * and return all further requests from the same dasd_block as well.
1da177e4 1246 */
8e09f215
SW		 1247static void __dasd_device_recovery(struct dasd_device *device,
1248 struct dasd_ccw_req *ref_cqr)
1da177e4 1249{
8e09f215
SW		 1250 struct list_head *l, *n;
1251 struct dasd_ccw_req *cqr;
1da177e4 1252
8e09f215
SW		 1253 /*
1254 * only requeue request that came from the dasd_block layer
1255 */
1256 if (!ref_cqr->block)
1257 return;
1da177e4 1258
8e09f215
SW		 1259 list_for_each_safe(l, n, &device->ccw_queue) {
1260 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1261 if (cqr->status == DASD_CQR_QUEUED &&
1262 ref_cqr->block == cqr->block) {
1263 cqr->status = DASD_CQR_CLEARED;
1264 }
1265 }
1266};
1da177e4
LT		 1267
1268/*
8e09f215
SW		 1269 * Remove those ccw requests from the queue that need to be returned
1270 * to the upper layer.
1da177e4 1271 */
8e09f215
SW		 1272static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1273 struct list_head *final_queue)
1da177e4
LT		 1274{
1275 struct list_head *l, *n;
1276 struct dasd_ccw_req *cqr;
1da177e4 1277
1da177e4
LT		 1278 /* Process request with final status. */
1279 list_for_each_safe(l, n, &device->ccw_queue) {
8e09f215
SW		 1280 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1281
1da177e4 1282 /* Stop list processing at the first non-final request. */
8e09f215
SW		 1283 if (cqr->status == DASD_CQR_QUEUED ||
1284 cqr->status == DASD_CQR_IN_IO ||
1285 cqr->status == DASD_CQR_CLEAR_PENDING)
1da177e4 1286 break;
1da177e4 1287 if (cqr->status == DASD_CQR_ERROR) {
8e09f215 1288 __dasd_device_recovery(device, cqr);
20c64468 1289 }
1da177e4 1290 /* Rechain finished requests to final queue */
8e09f215 1291 list_move_tail(&cqr->devlist, final_queue);
1da177e4
LT		 1292 }
1293}
1294
1da177e4 1295/*
8e09f215
SW		 1296 * the cqrs from the final queue are returned to the upper layer
1297 * by setting a dasd_block state and calling the callback function
1da177e4 1298 */
8e09f215
SW		 1299static void __dasd_device_process_final_queue(struct dasd_device *device,
1300 struct list_head *final_queue)
1da177e4 1301{
8e09f215 1302 struct list_head *l, *n;
1da177e4 1303 struct dasd_ccw_req *cqr;
03513bcc 1304 struct dasd_block *block;
c80ee724
SH		 1305 void (*callback)(struct dasd_ccw_req *, void *data);
1306 void *callback_data;
fc19f381 1307 char errorstring[ERRORLENGTH];
f24acd45 1308
8e09f215
SW		 1309 list_for_each_safe(l, n, final_queue) {
1310 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1311 list_del_init(&cqr->devlist);
03513bcc 1312 block = cqr->block;
c80ee724
SH		 1313 callback = cqr->callback;
1314 callback_data = cqr->callback_data;
03513bcc
SW		 1315 if (block)
1316 spin_lock_bh(&block->queue_lock);
8e09f215
SW		 1317 switch (cqr->status) {
1318 case DASD_CQR_SUCCESS:
1319 cqr->status = DASD_CQR_DONE;
1320 break;
1321 case DASD_CQR_ERROR:
1322 cqr->status = DASD_CQR_NEED_ERP;
1323 break;
1324 case DASD_CQR_CLEARED:
1325 cqr->status = DASD_CQR_TERMINATED;
1326 break;
1327 default:
fc19f381
SH		 1328 /* internal error 12 - wrong cqr status*/
1329 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1330 dev_err(&device->cdev->dev,
1331 "An error occurred in the DASD device driver, "
1332 "reason=%s\n", errorstring);
8e09f215 1333 BUG();
1da177e4 1334 }
8e09f215 1335 if (cqr->callback != NULL)
c80ee724 1336 (callback)(cqr, callback_data);
03513bcc
SW		 1337 if (block)
1338 spin_unlock_bh(&block->queue_lock);
1da177e4
LT		 1339 }
1340}
1341
1342/*
1343 * Take a look at the first request on the ccw queue and check
1344 * if it reached its expire time. If so, terminate the IO.
1345 */
8e09f215 1346static void __dasd_device_check_expire(struct dasd_device *device)
1da177e4
LT		 1347{
1348 struct dasd_ccw_req *cqr;
1349
1350 if (list_empty(&device->ccw_queue))
1351 return;
8e09f215 1352 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
29145a6c
HH		 1353 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1354 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
1355 if (device->discipline->term_IO(cqr) != 0) {
1356 /* Hmpf, try again in 5 sec */
fc19f381 1357 dev_err(&device->cdev->dev,
625c94df 1358 "cqr %p timed out (%lus) but cannot be "
fc19f381
SH		 1359 "ended, retrying in 5 s\n",
1360 cqr, (cqr->expires/HZ));
7dc1da9f
SH		 1361 cqr->expires += 5*HZ;
1362 dasd_device_set_timer(device, 5*HZ);
29145a6c 1363 } else {
fc19f381 1364 dev_err(&device->cdev->dev,
625c94df 1365 "cqr %p timed out (%lus), %i retries "
fc19f381
SH		 1366 "remaining\n", cqr, (cqr->expires/HZ),
1367 cqr->retries);
1da177e4
LT		 1368 }
1369 }
1370}
1371
1372/*
1373 * Take a look at the first request on the ccw queue and check
1374 * if it needs to be started.
1375 */
8e09f215 1376static void __dasd_device_start_head(struct dasd_device *device)
1da177e4
LT		 1377{
1378 struct dasd_ccw_req *cqr;
1379 int rc;
1380
1381 if (list_empty(&device->ccw_queue))
1382 return;
8e09f215 1383 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
25ee4cf8
PO		 1384 if (cqr->status != DASD_CQR_QUEUED)
1385 return;
a4d26c6a
SW		 1386 /* when device is stopped, return request to previous layer
1387 * exception: only the disconnect or unresumed bits are set and the
1388 * cqr is a path verification request
1389 */
1390 if (device->stopped &&
1391 !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
1392 && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) {
1393 cqr->intrc = -EAGAIN;
8e09f215
SW		 1394 cqr->status = DASD_CQR_CLEARED;
1395 dasd_schedule_device_bh(device);
25ee4cf8 1396 return;
1c01b8a5 1397 }
25ee4cf8
PO		 1398
1399 rc = device->discipline->start_IO(cqr);
1400 if (rc == 0)
8e09f215 1401 dasd_device_set_timer(device, cqr->expires);
25ee4cf8 1402 else if (rc == -EACCES) {
8e09f215 1403 dasd_schedule_device_bh(device);
25ee4cf8
PO		 1404 } else
1405 /* Hmpf, try again in 1/2 sec */
8e09f215 1406 dasd_device_set_timer(device, 50);
8f61701b
HH		 1407}
1408
a4d26c6a
SW		 1409static void __dasd_device_check_path_events(struct dasd_device *device)
1410{
1411 int rc;
1412
1413 if (device->path_data.tbvpm) {
1414 if (device->stopped & ~(DASD_STOPPED_DC_WAIT |
1415 DASD_UNRESUMED_PM))
1416 return;
1417 rc = device->discipline->verify_path(
1418 device, device->path_data.tbvpm);
1419 if (rc)
1420 dasd_device_set_timer(device, 50);
1421 else
1422 device->path_data.tbvpm = 0;
1423 }
1424};
1425
1da177e4 1426/*
8e09f215
SW		 1427 * Go through all request on the dasd_device request queue,
1428 * terminate them on the cdev if necessary, and return them to the
1429 * submitting layer via callback.
1430 * Note:
1431 * Make sure that all 'submitting layers' still exist when
1432 * this function is called!. In other words, when 'device' is a base
1433 * device then all block layer requests must have been removed before
1434 * via dasd_flush_block_queue.
1da177e4 1435 */
8e09f215 1436int dasd_flush_device_queue(struct dasd_device *device)
1da177e4 1437{
8e09f215
SW		 1438 struct dasd_ccw_req *cqr, *n;
1439 int rc;
1da177e4 1440 struct list_head flush_queue;
1da177e4
LT		 1441
1442 INIT_LIST_HEAD(&flush_queue);
1443 spin_lock_irq(get_ccwdev_lock(device->cdev));
8f61701b 1444 rc = 0;
8e09f215 1445 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
8f61701b
HH		 1446 /* Check status and move request to flush_queue */
1447 switch (cqr->status) {
1448 case DASD_CQR_IN_IO:
1449 rc = device->discipline->term_IO(cqr);
1450 if (rc) {
1451 /* unable to terminate requeust */
fc19f381
SH		 1452 dev_err(&device->cdev->dev,
1453 "Flushing the DASD request queue "
1454 "failed for request %p\n", cqr);
8f61701b
HH		 1455 /* stop flush processing */
1456 goto finished;
1457 }
1458 break;
1459 case DASD_CQR_QUEUED:
1da177e4 1460 cqr->stopclk = get_clock();
8e09f215 1461 cqr->status = DASD_CQR_CLEARED;
8f61701b 1462 break;
8e09f215 1463 default: /* no need to modify the others */
8f61701b
HH		 1464 break;
1465 }
8e09f215 1466 list_move_tail(&cqr->devlist, &flush_queue);
8f61701b 1467 }
8f61701b
HH		 1468finished:
1469 spin_unlock_irq(get_ccwdev_lock(device->cdev));
8e09f215
SW		 1470 /*
1471 * After this point all requests must be in state CLEAR_PENDING,
1472 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
1473 * one of the others.
1474 */
1475 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
1476 wait_event(dasd_flush_wq,
1477 (cqr->status != DASD_CQR_CLEAR_PENDING));
1478 /*
1479 * Now set each request back to TERMINATED, DONE or NEED_ERP
1480 * and call the callback function of flushed requests
1481 */
1482 __dasd_device_process_final_queue(device, &flush_queue);
8f61701b 1483 return rc;
1da177e4
LT		 1484}
1485
1486/*
1487 * Acquire the device lock and process queues for the device.
1488 */
8e09f215 1489static void dasd_device_tasklet(struct dasd_device *device)
1da177e4
LT		 1490{
1491 struct list_head final_queue;
1da177e4
LT		 1492
1493 atomic_set (&device->tasklet_scheduled, 0);
1494 INIT_LIST_HEAD(&final_queue);
1495 spin_lock_irq(get_ccwdev_lock(device->cdev));
1496 /* Check expire time of first request on the ccw queue. */
8e09f215
SW		 1497 __dasd_device_check_expire(device);
1498 /* find final requests on ccw queue */
1499 __dasd_device_process_ccw_queue(device, &final_queue);
a4d26c6a 1500 __dasd_device_check_path_events(device);
1da177e4
LT		 1501 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1502 /* Now call the callback function of requests with final status */
8e09f215
SW		 1503 __dasd_device_process_final_queue(device, &final_queue);
1504 spin_lock_irq(get_ccwdev_lock(device->cdev));
1da177e4 1505 /* Now check if the head of the ccw queue needs to be started. */
8e09f215
SW		 1506 __dasd_device_start_head(device);
1507 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1da177e4
LT		 1508 dasd_put_device(device);
1509}
1510
1511/*
1512 * Schedules a call to dasd_tasklet over the device tasklet.
1513 */
8e09f215 1514void dasd_schedule_device_bh(struct dasd_device *device)
1da177e4
LT		 1515{
1516 /* Protect against rescheduling. */
973bd993 1517 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
1da177e4
LT		 1518 return;
1519 dasd_get_device(device);
1520 tasklet_hi_schedule(&device->tasklet);
1521}
1522
eb6e199b
SW		 1523void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
1524{
1525 device->stopped |= bits;
1526}
1527EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
1528
1529void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
1530{
1531 device->stopped &= ~bits;
1532 if (!device->stopped)
1533 wake_up(&generic_waitq);
1534}
1535EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
1536
1da177e4 1537/*
8e09f215
SW		 1538 * Queue a request to the head of the device ccw_queue.
1539 * Start the I/O if possible.
1da177e4 1540 */
8e09f215 1541void dasd_add_request_head(struct dasd_ccw_req *cqr)
1da177e4
LT		 1542{
1543 struct dasd_device *device;
1544 unsigned long flags;
1545
8e09f215 1546 device = cqr->startdev;
1da177e4 1547 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
8e09f215
SW		 1548 cqr->status = DASD_CQR_QUEUED;
1549 list_add(&cqr->devlist, &device->ccw_queue);
1da177e4 1550 /* let the bh start the request to keep them in order */
8e09f215 1551 dasd_schedule_device_bh(device);
1da177e4
LT		 1552 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1553}
1554
1555/*
8e09f215
SW		 1556 * Queue a request to the tail of the device ccw_queue.
1557 * Start the I/O if possible.
1da177e4 1558 */
8e09f215 1559void dasd_add_request_tail(struct dasd_ccw_req *cqr)
1da177e4
LT		 1560{
1561 struct dasd_device *device;
1562 unsigned long flags;
1563
8e09f215 1564 device = cqr->startdev;
1da177e4 1565 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
8e09f215
SW		 1566 cqr->status = DASD_CQR_QUEUED;
1567 list_add_tail(&cqr->devlist, &device->ccw_queue);
1da177e4 1568 /* let the bh start the request to keep them in order */
8e09f215 1569 dasd_schedule_device_bh(device);
1da177e4
LT		 1570 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1571}
1572
1573/*
8e09f215 1574 * Wakeup helper for the 'sleep_on' functions.
1da177e4 1575 */
8e09f215 1576static void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
1da177e4 1577{
1c1e093c
SW		 1578 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
1579 cqr->callback_data = DASD_SLEEPON_END_TAG;
1580 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
1581 wake_up(&generic_waitq);
1da177e4
LT		 1582}
1583
8e09f215 1584static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
1da177e4
LT		 1585{
1586 struct dasd_device *device;
1587 int rc;
1588
8e09f215 1589 device = cqr->startdev;
1da177e4 1590 spin_lock_irq(get_ccwdev_lock(device->cdev));
1c1e093c 1591 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
1da177e4
LT		 1592 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1593 return rc;
1594}
1595
1596/*
eb6e199b 1597 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
1da177e4 1598 */
eb6e199b 1599static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
1da177e4 1600{
1da177e4 1601 struct dasd_device *device;
eb6e199b 1602 dasd_erp_fn_t erp_fn;
138c014d 1603
eb6e199b
SW		 1604 if (cqr->status == DASD_CQR_FILLED)
1605 return 0;
8e09f215 1606 device = cqr->startdev;
eb6e199b
SW		 1607 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
1608 if (cqr->status == DASD_CQR_TERMINATED) {
1609 device->discipline->handle_terminated_request(cqr);
1610 return 1;
1611 }
1612 if (cqr->status == DASD_CQR_NEED_ERP) {
1613 erp_fn = device->discipline->erp_action(cqr);
1614 erp_fn(cqr);
1615 return 1;
1616 }
1617 if (cqr->status == DASD_CQR_FAILED)
1618 dasd_log_sense(cqr, &cqr->irb);
1619 if (cqr->refers) {
1620 __dasd_process_erp(device, cqr);
1621 return 1;
1622 }
1623 }
1624 return 0;
1625}
138c014d 1626
eb6e199b
SW		 1627static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
1628{
1629 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
1630 if (cqr->refers) /* erp is not done yet */
1631 return 1;
1632 return ((cqr->status != DASD_CQR_DONE) &&
1633 (cqr->status != DASD_CQR_FAILED));
1634 } else
1635 return (cqr->status == DASD_CQR_FILLED);
1636}
138c014d 1637
eb6e199b
SW		 1638static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
1639{
1640 struct dasd_device *device;
1641 int rc;
1642 struct list_head ccw_queue;
1643 struct dasd_ccw_req *cqr;
1644
1645 INIT_LIST_HEAD(&ccw_queue);
1646 maincqr->status = DASD_CQR_FILLED;
1647 device = maincqr->startdev;
1648 list_add(&maincqr->blocklist, &ccw_queue);
1649 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
1650 cqr = list_first_entry(&ccw_queue,
1651 struct dasd_ccw_req, blocklist)) {
1652
1653 if (__dasd_sleep_on_erp(cqr))
1654 continue;
1655 if (cqr->status != DASD_CQR_FILLED) /* could be failed */
1656 continue;
5a27e60d
SW		 1657 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
1658 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1659 cqr->status = DASD_CQR_FAILED;
1660 cqr->intrc = -EPERM;
1661 continue;
1662 }
eb6e199b
SW		 1663 /* Non-temporary stop condition will trigger fail fast */
1664 if (device->stopped & ~DASD_STOPPED_PENDING &&
1665 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
1666 (!dasd_eer_enabled(device))) {
1667 cqr->status = DASD_CQR_FAILED;
1668 continue;
1669 }
eb6e199b
SW		 1670 /* Don't try to start requests if device is stopped */
1671 if (interruptible) {
1672 rc = wait_event_interruptible(
1673 generic_waitq, !(device->stopped));
1674 if (rc == -ERESTARTSYS) {
1675 cqr->status = DASD_CQR_FAILED;
1676 maincqr->intrc = rc;
1677 continue;
1678 }
1679 } else
1680 wait_event(generic_waitq, !(device->stopped));
1681
1682 cqr->callback = dasd_wakeup_cb;
1c1e093c 1683 cqr->callback_data = DASD_SLEEPON_START_TAG;
eb6e199b
SW		 1684 dasd_add_request_tail(cqr);
1685 if (interruptible) {
1686 rc = wait_event_interruptible(
1687 generic_waitq, _wait_for_wakeup(cqr));
1688 if (rc == -ERESTARTSYS) {
1689 dasd_cancel_req(cqr);
1690 /* wait (non-interruptible) for final status */
1691 wait_event(generic_waitq,
1692 _wait_for_wakeup(cqr));
1693 cqr->status = DASD_CQR_FAILED;
1694 maincqr->intrc = rc;
1695 continue;
1696 }
1697 } else
1698 wait_event(generic_waitq, _wait_for_wakeup(cqr));
1699 }
1700
1701 maincqr->endclk = get_clock();
1702 if ((maincqr->status != DASD_CQR_DONE) &&
1703 (maincqr->intrc != -ERESTARTSYS))
1704 dasd_log_sense(maincqr, &maincqr->irb);
1705 if (maincqr->status == DASD_CQR_DONE)
6cc7f168 1706 rc = 0;
eb6e199b
SW		 1707 else if (maincqr->intrc)
1708 rc = maincqr->intrc;
6cc7f168
SW		 1709 else
1710 rc = -EIO;
1da177e4
LT		 1711 return rc;
1712}
1713
eb6e199b
SW		 1714/*
1715 * Queue a request to the tail of the device ccw_queue and wait for
1716 * it's completion.
1717 */
1718int dasd_sleep_on(struct dasd_ccw_req *cqr)
1719{
1720 return _dasd_sleep_on(cqr, 0);
1721}
1722
1da177e4 1723/*
8e09f215
SW		 1724 * Queue a request to the tail of the device ccw_queue and wait
1725 * interruptible for it's completion.
1da177e4 1726 */
8e09f215 1727int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
1da177e4 1728{
eb6e199b 1729 return _dasd_sleep_on(cqr, 1);
1da177e4
LT		 1730}
1731
1732/*
1733 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
1734 * for eckd devices) the currently running request has to be terminated
1735 * and be put back to status queued, before the special request is added
1736 * to the head of the queue. Then the special request is waited on normally.
1737 */
8e09f215 1738static inline int _dasd_term_running_cqr(struct dasd_device *device)
1da177e4
LT		 1739{
1740 struct dasd_ccw_req *cqr;
1da177e4
LT		 1741
1742 if (list_empty(&device->ccw_queue))
1743 return 0;
8e09f215 1744 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
8f61701b 1745 return device->discipline->term_IO(cqr);
1da177e4
LT		 1746}
1747
8e09f215 1748int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
1da177e4 1749{
1da177e4
LT		 1750 struct dasd_device *device;
1751 int rc;
138c014d 1752
8e09f215 1753 device = cqr->startdev;
5a27e60d
SW		 1754 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
1755 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1756 cqr->status = DASD_CQR_FAILED;
1757 cqr->intrc = -EPERM;
1758 return -EIO;
1759 }
1da177e4
LT		 1760 spin_lock_irq(get_ccwdev_lock(device->cdev));
1761 rc = _dasd_term_running_cqr(device);
1762 if (rc) {
1763 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1764 return rc;
1765 }
1da177e4 1766 cqr->callback = dasd_wakeup_cb;
1c1e093c 1767 cqr->callback_data = DASD_SLEEPON_START_TAG;
1da177e4 1768 cqr->status = DASD_CQR_QUEUED;
8e09f215 1769 list_add(&cqr->devlist, &device->ccw_queue);
138c014d 1770
1da177e4 1771 /* let the bh start the request to keep them in order */
8e09f215 1772 dasd_schedule_device_bh(device);
138c014d 1773
1da177e4
LT		 1774 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1775
c80ee724 1776 wait_event(generic_waitq, _wait_for_wakeup(cqr));
138c014d 1777
6cc7f168
SW		 1778 if (cqr->status == DASD_CQR_DONE)
1779 rc = 0;
1780 else if (cqr->intrc)
1781 rc = cqr->intrc;
1782 else
1783 rc = -EIO;
1da177e4
LT		 1784 return rc;
1785}
1786
1787/*
1788 * Cancels a request that was started with dasd_sleep_on_req.
1789 * This is useful to timeout requests. The request will be
1790 * terminated if it is currently in i/o.
1791 * Returns 1 if the request has been terminated.
8e09f215
SW		 1792 * 0 if there was no need to terminate the request (not started yet)
1793 * negative error code if termination failed
1794 * Cancellation of a request is an asynchronous operation! The calling
1795 * function has to wait until the request is properly returned via callback.
1da177e4 1796 */
8e09f215 1797int dasd_cancel_req(struct dasd_ccw_req *cqr)
1da177e4 1798{
8e09f215 1799 struct dasd_device *device = cqr->startdev;
1da177e4
LT		 1800 unsigned long flags;
1801 int rc;
1802
1803 rc = 0;
1804 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1805 switch (cqr->status) {
1806 case DASD_CQR_QUEUED:
8e09f215
SW		 1807 /* request was not started - just set to cleared */
1808 cqr->status = DASD_CQR_CLEARED;
1da177e4
LT		 1809 break;
1810 case DASD_CQR_IN_IO:
1811 /* request in IO - terminate IO and release again */
8e09f215
SW		 1812 rc = device->discipline->term_IO(cqr);
1813 if (rc) {
fc19f381
SH		 1814 dev_err(&device->cdev->dev,
1815 "Cancelling request %p failed with rc=%d\n",
1816 cqr, rc);
8e09f215
SW		 1817 } else {
1818 cqr->stopclk = get_clock();
8e09f215 1819 }
1da177e4 1820 break;
8e09f215 1821 default: /* already finished or clear pending - do nothing */
1da177e4 1822 break;
8e09f215
SW		 1823 }
1824 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1825 dasd_schedule_device_bh(device);
1826 return rc;
1827}
1828
1829
1830/*
1831 * SECTION: Operations of the dasd_block layer.
1832 */
1833
1834/*
1835 * Timeout function for dasd_block. This is used when the block layer
1836 * is waiting for something that may not come reliably, (e.g. a state
1837 * change interrupt)
1838 */
1839static void dasd_block_timeout(unsigned long ptr)
1840{
1841 unsigned long flags;
1842 struct dasd_block *block;
1843
1844 block = (struct dasd_block *) ptr;
1845 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
1846 /* re-activate request queue */
eb6e199b 1847 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
8e09f215
SW		 1848 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
1849 dasd_schedule_block_bh(block);
1850}
1851
1852/*
1853 * Setup timeout for a dasd_block in jiffies.
1854 */
1855void dasd_block_set_timer(struct dasd_block *block, int expires)
1856{
48cae885
SW		 1857 if (expires == 0)
1858 del_timer(&block->timer);
1859 else
1860 mod_timer(&block->timer, jiffies + expires);
8e09f215
SW		 1861}
1862
1863/*
1864 * Clear timeout for a dasd_block.
1865 */
1866void dasd_block_clear_timer(struct dasd_block *block)
1867{
48cae885 1868 del_timer(&block->timer);
8e09f215
SW		 1869}
1870
8e09f215
SW		 1871/*
1872 * Process finished error recovery ccw.
1873 */
eb6e199b
SW		 1874static void __dasd_process_erp(struct dasd_device *device,
1875 struct dasd_ccw_req *cqr)
8e09f215
SW		 1876{
1877 dasd_erp_fn_t erp_fn;
8e09f215
SW		 1878
1879 if (cqr->status == DASD_CQR_DONE)
1880 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
1881 else
fc19f381 1882 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
8e09f215
SW		 1883 erp_fn = device->discipline->erp_postaction(cqr);
1884 erp_fn(cqr);
1885}
1da177e4 1886
8e09f215
SW		 1887/*
1888 * Fetch requests from the block device queue.
1889 */
1890static void __dasd_process_request_queue(struct dasd_block *block)
1891{
1892 struct request_queue *queue;
1893 struct request *req;
1894 struct dasd_ccw_req *cqr;
1895 struct dasd_device *basedev;
1896 unsigned long flags;
1897 queue = block->request_queue;
1898 basedev = block->base;
1899 /* No queue ? Then there is nothing to do. */
1900 if (queue == NULL)
1901 return;
1902
1903 /*
1904 * We requeue request from the block device queue to the ccw
1905 * queue only in two states. In state DASD_STATE_READY the
1906 * partition detection is done and we need to requeue requests
1907 * for that. State DASD_STATE_ONLINE is normal block device
1908 * operation.
1909 */
97f604b0
SW		 1910 if (basedev->state < DASD_STATE_READY) {
1911 while ((req = blk_fetch_request(block->request_queue)))
1912 __blk_end_request_all(req, -EIO);
8e09f215 1913 return;
97f604b0 1914 }
8e09f215 1915 /* Now we try to fetch requests from the request queue */
9934c8c0 1916 while (!blk_queue_plugged(queue) && (req = blk_peek_request(queue))) {
8e09f215
SW		 1917 if (basedev->features & DASD_FEATURE_READONLY &&
1918 rq_data_dir(req) == WRITE) {
1919 DBF_DEV_EVENT(DBF_ERR, basedev,
1920 "Rejecting write request %p",
1921 req);
9934c8c0 1922 blk_start_request(req);
40cbbb78 1923 __blk_end_request_all(req, -EIO);
8e09f215
SW		 1924 continue;
1925 }
1926 cqr = basedev->discipline->build_cp(basedev, block, req);
1927 if (IS_ERR(cqr)) {
1928 if (PTR_ERR(cqr) == -EBUSY)
1929 break; /* normal end condition */
1930 if (PTR_ERR(cqr) == -ENOMEM)
1931 break; /* terminate request queue loop */
1932 if (PTR_ERR(cqr) == -EAGAIN) {
1933 /*
1934 * The current request cannot be build right
1935 * now, we have to try later. If this request
1936 * is the head-of-queue we stop the device
1937 * for 1/2 second.
1938 */
1939 if (!list_empty(&block->ccw_queue))
1940 break;
eb6e199b
SW		 1941 spin_lock_irqsave(
1942 get_ccwdev_lock(basedev->cdev), flags);
1943 dasd_device_set_stop_bits(basedev,
1944 DASD_STOPPED_PENDING);
1945 spin_unlock_irqrestore(
1946 get_ccwdev_lock(basedev->cdev), flags);
8e09f215
SW		 1947 dasd_block_set_timer(block, HZ/2);
1948 break;
1949 }
1950 DBF_DEV_EVENT(DBF_ERR, basedev,
1951 "CCW creation failed (rc=%ld) "
1952 "on request %p",
1953 PTR_ERR(cqr), req);
9934c8c0 1954 blk_start_request(req);
40cbbb78 1955 __blk_end_request_all(req, -EIO);
8e09f215
SW		 1956 continue;
1957 }
1958 /*
1959 * Note: callback is set to dasd_return_cqr_cb in
1960 * __dasd_block_start_head to cover erp requests as well
1961 */
1962 cqr->callback_data = (void *) req;
1963 cqr->status = DASD_CQR_FILLED;
9934c8c0 1964 blk_start_request(req);
8e09f215
SW		 1965 list_add_tail(&cqr->blocklist, &block->ccw_queue);
1966 dasd_profile_start(block, cqr, req);
1967 }
1968}
1969
1970static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
1971{
1972 struct request *req;
1973 int status;
4c4e2148 1974 int error = 0;
8e09f215
SW		 1975
1976 req = (struct request *) cqr->callback_data;
1977 dasd_profile_end(cqr->block, cqr, req);
fe6b8e76 1978 status = cqr->block->base->discipline->free_cp(cqr, req);
4c4e2148
KU		 1979 if (status <= 0)
1980 error = status ? status : -EIO;
40cbbb78 1981 __blk_end_request_all(req, error);
8e09f215
SW		 1982}
1983
1984/*
1985 * Process ccw request queue.
1986 */
1987static void __dasd_process_block_ccw_queue(struct dasd_block *block,
1988 struct list_head *final_queue)
1989{
1990 struct list_head *l, *n;
1991 struct dasd_ccw_req *cqr;
1992 dasd_erp_fn_t erp_fn;
1993 unsigned long flags;
1994 struct dasd_device *base = block->base;
1995
1996restart:
1997 /* Process request with final status. */
1998 list_for_each_safe(l, n, &block->ccw_queue) {
1999 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2000 if (cqr->status != DASD_CQR_DONE &&
2001 cqr->status != DASD_CQR_FAILED &&
2002 cqr->status != DASD_CQR_NEED_ERP &&
2003 cqr->status != DASD_CQR_TERMINATED)
2004 continue;
2005
2006 if (cqr->status == DASD_CQR_TERMINATED) {
2007 base->discipline->handle_terminated_request(cqr);
2008 goto restart;
2009 }
2010
2011 /* Process requests that may be recovered */
2012 if (cqr->status == DASD_CQR_NEED_ERP) {
6c5f57c7 2013 erp_fn = base->discipline->erp_action(cqr);
6a5176c4
SH		 2014 if (IS_ERR(erp_fn(cqr)))
2015 continue;
8e09f215
SW		 2016 goto restart;
2017 }
2018
a9cffb22
SH		 2019 /* log sense for fatal error */
2020 if (cqr->status == DASD_CQR_FAILED) {
2021 dasd_log_sense(cqr, &cqr->irb);
2022 }
2023
8e09f215
SW		 2024 /* First of all call extended error reporting. */
2025 if (dasd_eer_enabled(base) &&
2026 cqr->status == DASD_CQR_FAILED) {
2027 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
2028
2029 /* restart request */
2030 cqr->status = DASD_CQR_FILLED;
2031 cqr->retries = 255;
2032 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
eb6e199b 2033 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
8e09f215
SW		 2034 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
2035 flags);
2036 goto restart;
2037 }
2038
2039 /* Process finished ERP request. */
2040 if (cqr->refers) {
eb6e199b 2041 __dasd_process_erp(base, cqr);
8e09f215
SW		 2042 goto restart;
2043 }
2044
2045 /* Rechain finished requests to final queue */
2046 cqr->endclk = get_clock();
2047 list_move_tail(&cqr->blocklist, final_queue);
2048 }
2049}
2050
2051static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
2052{
2053 dasd_schedule_block_bh(cqr->block);
2054}
2055
2056static void __dasd_block_start_head(struct dasd_block *block)
2057{
2058 struct dasd_ccw_req *cqr;
2059
2060 if (list_empty(&block->ccw_queue))
2061 return;
2062 /* We allways begin with the first requests on the queue, as some
2063 * of previously started requests have to be enqueued on a
2064 * dasd_device again for error recovery.
2065 */
2066 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
2067 if (cqr->status != DASD_CQR_FILLED)
2068 continue;
5a27e60d
SW		 2069 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
2070 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2071 cqr->status = DASD_CQR_FAILED;
2072 cqr->intrc = -EPERM;
2073 dasd_schedule_block_bh(block);
2074 continue;
2075 }
8e09f215
SW		 2076 /* Non-temporary stop condition will trigger fail fast */
2077 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
2078 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2079 (!dasd_eer_enabled(block->base))) {
2080 cqr->status = DASD_CQR_FAILED;
2081 dasd_schedule_block_bh(block);
2082 continue;
2083 }
2084 /* Don't try to start requests if device is stopped */
2085 if (block->base->stopped)
2086 return;
2087
2088 /* just a fail safe check, should not happen */
2089 if (!cqr->startdev)
2090 cqr->startdev = block->base;
2091
2092 /* make sure that the requests we submit find their way back */
2093 cqr->callback = dasd_return_cqr_cb;
2094
2095 dasd_add_request_tail(cqr);
2096 }
2097}
2098
2099/*
2100 * Central dasd_block layer routine. Takes requests from the generic
2101 * block layer request queue, creates ccw requests, enqueues them on
2102 * a dasd_device and processes ccw requests that have been returned.
2103 */
2104static void dasd_block_tasklet(struct dasd_block *block)
2105{
2106 struct list_head final_queue;
2107 struct list_head *l, *n;
2108 struct dasd_ccw_req *cqr;
2109
2110 atomic_set(&block->tasklet_scheduled, 0);
2111 INIT_LIST_HEAD(&final_queue);
2112 spin_lock(&block->queue_lock);
2113 /* Finish off requests on ccw queue */
2114 __dasd_process_block_ccw_queue(block, &final_queue);
2115 spin_unlock(&block->queue_lock);
2116 /* Now call the callback function of requests with final status */
2117 spin_lock_irq(&block->request_queue_lock);
2118 list_for_each_safe(l, n, &final_queue) {
2119 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2120 list_del_init(&cqr->blocklist);
2121 __dasd_cleanup_cqr(cqr);
2122 }
2123 spin_lock(&block->queue_lock);
2124 /* Get new request from the block device request queue */
2125 __dasd_process_request_queue(block);
2126 /* Now check if the head of the ccw queue needs to be started. */
2127 __dasd_block_start_head(block);
2128 spin_unlock(&block->queue_lock);
2129 spin_unlock_irq(&block->request_queue_lock);
2130 dasd_put_device(block->base);
2131}
2132
2133static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2134{
2135 wake_up(&dasd_flush_wq);
2136}
2137
2138/*
2139 * Go through all request on the dasd_block request queue, cancel them
2140 * on the respective dasd_device, and return them to the generic
2141 * block layer.
2142 */
2143static int dasd_flush_block_queue(struct dasd_block *block)
2144{
2145 struct dasd_ccw_req *cqr, *n;
2146 int rc, i;
2147 struct list_head flush_queue;
2148
2149 INIT_LIST_HEAD(&flush_queue);
2150 spin_lock_bh(&block->queue_lock);
2151 rc = 0;
2152restart:
2153 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2154 /* if this request currently owned by a dasd_device cancel it */
2155 if (cqr->status >= DASD_CQR_QUEUED)
2156 rc = dasd_cancel_req(cqr);
2157 if (rc < 0)
2158 break;
2159 /* Rechain request (including erp chain) so it won't be
2160 * touched by the dasd_block_tasklet anymore.
2161 * Replace the callback so we notice when the request
2162 * is returned from the dasd_device layer.
2163 */
2164 cqr->callback = _dasd_wake_block_flush_cb;
2165 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2166 list_move_tail(&cqr->blocklist, &flush_queue);
2167 if (i > 1)
2168 /* moved more than one request - need to restart */
2169 goto restart;
2170 }
2171 spin_unlock_bh(&block->queue_lock);
2172 /* Now call the callback function of flushed requests */
2173restart_cb:
2174 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
2175 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
2176 /* Process finished ERP request. */
2177 if (cqr->refers) {
0cd4bd47 2178 spin_lock_bh(&block->queue_lock);
eb6e199b 2179 __dasd_process_erp(block->base, cqr);
0cd4bd47 2180 spin_unlock_bh(&block->queue_lock);
8e09f215
SW		 2181 /* restart list_for_xx loop since dasd_process_erp
2182 * might remove multiple elements */
2183 goto restart_cb;
2184 }
2185 /* call the callback function */
0cd4bd47 2186 spin_lock_irq(&block->request_queue_lock);
8e09f215
SW		 2187 cqr->endclk = get_clock();
2188 list_del_init(&cqr->blocklist);
2189 __dasd_cleanup_cqr(cqr);
0cd4bd47 2190 spin_unlock_irq(&block->request_queue_lock);
1da177e4 2191 }
1da177e4
LT		 2192 return rc;
2193}
2194
2195/*
8e09f215
SW		 2196 * Schedules a call to dasd_tasklet over the device tasklet.
2197 */
2198void dasd_schedule_block_bh(struct dasd_block *block)
2199{
2200 /* Protect against rescheduling. */
2201 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
2202 return;
2203 /* life cycle of block is bound to it's base device */
2204 dasd_get_device(block->base);
2205 tasklet_hi_schedule(&block->tasklet);
2206}
2207
2208
2209/*
2210 * SECTION: external block device operations
2211 * (request queue handling, open, release, etc.)
1da177e4
LT		 2212 */
2213
2214/*
2215 * Dasd request queue function. Called from ll_rw_blk.c
2216 */
8e09f215 2217static void do_dasd_request(struct request_queue *queue)
1da177e4 2218{
8e09f215 2219 struct dasd_block *block;
1da177e4 2220
8e09f215
SW		 2221 block = queue->queuedata;
2222 spin_lock(&block->queue_lock);
1da177e4 2223 /* Get new request from the block device request queue */
8e09f215 2224 __dasd_process_request_queue(block);
1da177e4 2225 /* Now check if the head of the ccw queue needs to be started. */
8e09f215
SW		 2226 __dasd_block_start_head(block);
2227 spin_unlock(&block->queue_lock);
1da177e4
LT		 2228}
2229
2230/*
2231 * Allocate and initialize request queue and default I/O scheduler.
2232 */
8e09f215 2233static int dasd_alloc_queue(struct dasd_block *block)
1da177e4
LT		 2234{
2235 int rc;
2236
8e09f215
SW		 2237 block->request_queue = blk_init_queue(do_dasd_request,
2238 &block->request_queue_lock);
2239 if (block->request_queue == NULL)
1da177e4
LT		 2240 return -ENOMEM;
2241
8e09f215 2242 block->request_queue->queuedata = block;
1da177e4 2243
8e09f215 2244 elevator_exit(block->request_queue->elevator);
08a8a0c5 2245 block->request_queue->elevator = NULL;
8e09f215 2246 rc = elevator_init(block->request_queue, "deadline");
1da177e4 2247 if (rc) {
8e09f215 2248 blk_cleanup_queue(block->request_queue);
1da177e4
LT		 2249 return rc;
2250 }
2251 return 0;
2252}
2253
2254/*
2255 * Allocate and initialize request queue.
2256 */
8e09f215 2257static void dasd_setup_queue(struct dasd_block *block)
1da177e4
LT		 2258{
2259 int max;
2260
e1defc4f 2261 blk_queue_logical_block_size(block->request_queue, block->bp_block);
8e09f215 2262 max = block->base->discipline->max_blocks << block->s2b_shift;
086fa5ff 2263 blk_queue_max_hw_sectors(block->request_queue, max);
8a78362c 2264 blk_queue_max_segments(block->request_queue, -1L);
f3eb5384
SW		 2265 /* with page sized segments we can translate each segement into
2266 * one idaw/tidaw
2267 */
2268 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
2269 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
1da177e4
LT		 2270}
2271
2272/*
2273 * Deactivate and free request queue.
2274 */
8e09f215 2275static void dasd_free_queue(struct dasd_block *block)
1da177e4 2276{
8e09f215
SW		 2277 if (block->request_queue) {
2278 blk_cleanup_queue(block->request_queue);
2279 block->request_queue = NULL;
1da177e4
LT		 2280 }
2281}
2282
2283/*
2284 * Flush request on the request queue.
2285 */
8e09f215 2286static void dasd_flush_request_queue(struct dasd_block *block)
1da177e4
LT		 2287{
2288 struct request *req;
2289
8e09f215 2290 if (!block->request_queue)
1da177e4 2291 return;
138c014d 2292
8e09f215 2293 spin_lock_irq(&block->request_queue_lock);
9934c8c0 2294 while ((req = blk_fetch_request(block->request_queue)))
40cbbb78 2295 __blk_end_request_all(req, -EIO);
8e09f215 2296 spin_unlock_irq(&block->request_queue_lock);
1da177e4
LT		 2297}
2298
57a7c0bc 2299static int dasd_open(struct block_device *bdev, fmode_t mode)
1da177e4 2300{
57a7c0bc 2301 struct dasd_block *block = bdev->bd_disk->private_data;
9eb25122 2302 struct dasd_device *base;
1da177e4
LT		 2303 int rc;
2304
9eb25122
SH		 2305 if (!block)
2306 return -ENODEV;
2307
2308 base = block->base;
8e09f215
SW		 2309 atomic_inc(&block->open_count);
2310 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
1da177e4
LT		 2311 rc = -ENODEV;
2312 goto unlock;
2313 }
2314
8e09f215 2315 if (!try_module_get(base->discipline->owner)) {
1da177e4
LT		 2316 rc = -EINVAL;
2317 goto unlock;
2318 }
2319
2320 if (dasd_probeonly) {
fc19f381
SH		 2321 dev_info(&base->cdev->dev,
2322 "Accessing the DASD failed because it is in "
2323 "probeonly mode\n");
1da177e4
LT		 2324 rc = -EPERM;
2325 goto out;
2326 }
2327
8e09f215
SW		 2328 if (base->state <= DASD_STATE_BASIC) {
2329 DBF_DEV_EVENT(DBF_ERR, base, " %s",
1da177e4
LT		 2330 " Cannot open unrecognized device");
2331 rc = -ENODEV;
2332 goto out;
2333 }
2334
33b62a30
SW		 2335 if ((mode & FMODE_WRITE) &&
2336 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
2337 (base->features & DASD_FEATURE_READONLY))) {
2338 rc = -EROFS;
2339 goto out;
2340 }
2341
1da177e4
LT		 2342 return 0;
2343
2344out:
8e09f215 2345 module_put(base->discipline->owner);
1da177e4 2346unlock:
8e09f215 2347 atomic_dec(&block->open_count);
1da177e4
LT		 2348 return rc;
2349}
2350
57a7c0bc 2351static int dasd_release(struct gendisk *disk, fmode_t mode)
1da177e4 2352{
8e09f215 2353 struct dasd_block *block = disk->private_data;
1da177e4 2354
8e09f215
SW		 2355 atomic_dec(&block->open_count);
2356 module_put(block->base->discipline->owner);
1da177e4
LT		 2357 return 0;
2358}
2359
a885c8c4
CH		 2360/*
2361 * Return disk geometry.
2362 */
8e09f215 2363static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
a885c8c4 2364{
8e09f215
SW		 2365 struct dasd_block *block;
2366 struct dasd_device *base;
a885c8c4 2367
8e09f215 2368 block = bdev->bd_disk->private_data;
8e09f215 2369 if (!block)
a885c8c4 2370 return -ENODEV;
cf05b824 2371 base = block->base;
a885c8c4 2372
8e09f215
SW		 2373 if (!base->discipline ||
2374 !base->discipline->fill_geometry)
a885c8c4
CH		 2375 return -EINVAL;
2376
8e09f215
SW		 2377 base->discipline->fill_geometry(block, geo);
2378 geo->start = get_start_sect(bdev) >> block->s2b_shift;
a885c8c4
CH		 2379 return 0;
2380}
2381
83d5cde4 2382const struct block_device_operations
1da177e4
LT		 2383dasd_device_operations = {
2384 .owner = THIS_MODULE,
57a7c0bc
AV		 2385 .open = dasd_open,
2386 .release = dasd_release,
0000d031
HC		 2387 .ioctl = dasd_ioctl,
2388 .compat_ioctl = dasd_ioctl,
a885c8c4 2389 .getgeo = dasd_getgeo,
1da177e4
LT		 2390};
2391
8e09f215
SW		 2392/*******************************************************************************
2393 * end of block device operations
2394 */
1da177e4
LT		 2395
2396static void
2397dasd_exit(void)
2398{
2399#ifdef CONFIG_PROC_FS
2400 dasd_proc_exit();
2401#endif
20c64468 2402 dasd_eer_exit();
6bb0e010
HH		 2403 if (dasd_page_cache != NULL) {
2404 kmem_cache_destroy(dasd_page_cache);
2405 dasd_page_cache = NULL;
2406 }
1da177e4
LT		 2407 dasd_gendisk_exit();
2408 dasd_devmap_exit();
1da177e4
LT		 2409 if (dasd_debug_area != NULL) {
2410 debug_unregister(dasd_debug_area);
2411 dasd_debug_area = NULL;
2412 }
2413}
2414
2415/*
2416 * SECTION: common functions for ccw_driver use
2417 */
2418
33b62a30
SW		 2419/*
2420 * Is the device read-only?
2421 * Note that this function does not report the setting of the
2422 * readonly device attribute, but how it is configured in z/VM.
2423 */
2424int dasd_device_is_ro(struct dasd_device *device)
2425{
2426 struct ccw_dev_id dev_id;
2427 struct diag210 diag_data;
2428 int rc;
2429
2430 if (!MACHINE_IS_VM)
2431 return 0;
2432 ccw_device_get_id(device->cdev, &dev_id);
2433 memset(&diag_data, 0, sizeof(diag_data));
2434 diag_data.vrdcdvno = dev_id.devno;
2435 diag_data.vrdclen = sizeof(diag_data);
2436 rc = diag210(&diag_data);
2437 if (rc == 0 || rc == 2) {
2438 return diag_data.vrdcvfla & 0x80;
2439 } else {
2440 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
2441 dev_id.devno, rc);
2442 return 0;
2443 }
2444}
2445EXPORT_SYMBOL_GPL(dasd_device_is_ro);
2446
f3445a1a
CH		 2447static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
2448{
2449 struct ccw_device *cdev = data;
2450 int ret;
2451
2452 ret = ccw_device_set_online(cdev);
2453 if (ret)
2454 pr_warning("%s: Setting the DASD online failed with rc=%d\n",
2455 dev_name(&cdev->dev), ret);
f3445a1a
CH		 2456}
2457
1c01b8a5
HH		 2458/*
2459 * Initial attempt at a probe function. this can be simplified once
2460 * the other detection code is gone.
2461 */
8e09f215
SW		 2462int dasd_generic_probe(struct ccw_device *cdev,
2463 struct dasd_discipline *discipline)
1da177e4
LT		 2464{
2465 int ret;
2466
2467 ret = dasd_add_sysfs_files(cdev);
2468 if (ret) {
b8ed5dd5
SH		 2469 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
2470 "dasd_generic_probe: could not add "
2471 "sysfs entries");
40545573 2472 return ret;
1da177e4 2473 }
40545573 2474 cdev->handler = &dasd_int_handler;
1da177e4 2475
40545573
HH		 2476 /*
2477 * Automatically online either all dasd devices (dasd_autodetect)
2478 * or all devices specified with dasd= parameters during
2479 * initial probe.
2480 */
2481 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
2a0217d5 2482 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
f3445a1a 2483 async_schedule(dasd_generic_auto_online, cdev);
de3e0da1 2484 return 0;
1da177e4
LT		 2485}
2486
1c01b8a5
HH		 2487/*
2488 * This will one day be called from a global not_oper handler.
2489 * It is also used by driver_unregister during module unload.
2490 */
8e09f215 2491void dasd_generic_remove(struct ccw_device *cdev)
1da177e4
LT		 2492{
2493 struct dasd_device *device;
8e09f215 2494 struct dasd_block *block;
1da177e4 2495
59afda78
HH		 2496 cdev->handler = NULL;
2497
1da177e4
LT		 2498 dasd_remove_sysfs_files(cdev);
2499 device = dasd_device_from_cdev(cdev);
2500 if (IS_ERR(device))
2501 return;
2502 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
2503 /* Already doing offline processing */
2504 dasd_put_device(device);
2505 return;
2506 }
2507 /*
2508 * This device is removed unconditionally. Set offline
2509 * flag to prevent dasd_open from opening it while it is
2510 * no quite down yet.
2511 */
2512 dasd_set_target_state(device, DASD_STATE_NEW);
2513 /* dasd_delete_device destroys the device reference. */
8e09f215
SW		 2514 block = device->block;
2515 device->block = NULL;
1da177e4 2516 dasd_delete_device(device);
8e09f215
SW		 2517 /*
2518 * life cycle of block is bound to device, so delete it after
2519 * device was safely removed
2520 */
2521 if (block)
2522 dasd_free_block(block);
1da177e4
LT		 2523}
2524
1c01b8a5
HH		 2525/*
2526 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
1da177e4 2527 * the device is detected for the first time and is supposed to be used
1c01b8a5
HH		 2528 * or the user has started activation through sysfs.
2529 */
8e09f215
SW		 2530int dasd_generic_set_online(struct ccw_device *cdev,
2531 struct dasd_discipline *base_discipline)
1da177e4 2532{
aa88861f 2533 struct dasd_discipline *discipline;
1da177e4 2534 struct dasd_device *device;
c6eb7b77 2535 int rc;
f24acd45 2536
40545573
HH		 2537 /* first online clears initial online feature flag */
2538 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
1da177e4
LT		 2539 device = dasd_create_device(cdev);
2540 if (IS_ERR(device))
2541 return PTR_ERR(device);
2542
aa88861f 2543 discipline = base_discipline;
c6eb7b77 2544 if (device->features & DASD_FEATURE_USEDIAG) {
1da177e4 2545 if (!dasd_diag_discipline_pointer) {
fc19f381
SH		 2546 pr_warning("%s Setting the DASD online failed because "
2547 "of missing DIAG discipline\n",
2548 dev_name(&cdev->dev));
1da177e4
LT		 2549 dasd_delete_device(device);
2550 return -ENODEV;
2551 }
2552 discipline = dasd_diag_discipline_pointer;
2553 }
aa88861f
PO		 2554 if (!try_module_get(base_discipline->owner)) {
2555 dasd_delete_device(device);
2556 return -EINVAL;
2557 }
2558 if (!try_module_get(discipline->owner)) {
2559 module_put(base_discipline->owner);
2560 dasd_delete_device(device);
2561 return -EINVAL;
2562 }
2563 device->base_discipline = base_discipline;
1da177e4
LT		 2564 device->discipline = discipline;
2565
8e09f215 2566 /* check_device will allocate block device if necessary */
1da177e4
LT		 2567 rc = discipline->check_device(device);
2568 if (rc) {
fc19f381
SH		 2569 pr_warning("%s Setting the DASD online with discipline %s "
2570 "failed with rc=%i\n",
2571 dev_name(&cdev->dev), discipline->name, rc);
aa88861f
PO		 2572 module_put(discipline->owner);
2573 module_put(base_discipline->owner);
1da177e4
LT		 2574 dasd_delete_device(device);
2575 return rc;
2576 }
2577
2578 dasd_set_target_state(device, DASD_STATE_ONLINE);
2579 if (device->state <= DASD_STATE_KNOWN) {
fc19f381
SH		 2580 pr_warning("%s Setting the DASD online failed because of a "
2581 "missing discipline\n", dev_name(&cdev->dev));
1da177e4
LT		 2582 rc = -ENODEV;
2583 dasd_set_target_state(device, DASD_STATE_NEW);
8e09f215
SW		 2584 if (device->block)
2585 dasd_free_block(device->block);
1da177e4
LT		 2586 dasd_delete_device(device);
2587 } else
2588 pr_debug("dasd_generic device %s found\n",
2a0217d5 2589 dev_name(&cdev->dev));
589c74d5
SH		 2590
2591 wait_event(dasd_init_waitq, _wait_for_device(device));
2592
1da177e4 2593 dasd_put_device(device);
1da177e4
LT		 2594 return rc;
2595}
2596
8e09f215 2597int dasd_generic_set_offline(struct ccw_device *cdev)
1da177e4
LT		 2598{
2599 struct dasd_device *device;
8e09f215 2600 struct dasd_block *block;
dafd87aa 2601 int max_count, open_count;
1da177e4
LT		 2602
2603 device = dasd_device_from_cdev(cdev);
2604 if (IS_ERR(device))
2605 return PTR_ERR(device);
2606 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
2607 /* Already doing offline processing */
2608 dasd_put_device(device);
2609 return 0;
2610 }
2611 /*
2612 * We must make sure that this device is currently not in use.
2613 * The open_count is increased for every opener, that includes
2614 * the blkdev_get in dasd_scan_partitions. We are only interested
2615 * in the other openers.
2616 */
8e09f215 2617 if (device->block) {
a806170e
HC		 2618 max_count = device->block->bdev ? 0 : -1;
2619 open_count = atomic_read(&device->block->open_count);
8e09f215
SW		 2620 if (open_count > max_count) {
2621 if (open_count > 0)
fc19f381
SH		 2622 pr_warning("%s: The DASD cannot be set offline "
2623 "with open count %i\n",
2624 dev_name(&cdev->dev), open_count);
8e09f215 2625 else
fc19f381
SH		 2626 pr_warning("%s: The DASD cannot be set offline "
2627 "while it is in use\n",
2628 dev_name(&cdev->dev));
8e09f215
SW		 2629 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
2630 dasd_put_device(device);
2631 return -EBUSY;
2632 }
1da177e4
LT		 2633 }
2634 dasd_set_target_state(device, DASD_STATE_NEW);
2635 /* dasd_delete_device destroys the device reference. */
8e09f215
SW		 2636 block = device->block;
2637 device->block = NULL;
1da177e4 2638 dasd_delete_device(device);
8e09f215
SW		 2639 /*
2640 * life cycle of block is bound to device, so delete it after
2641 * device was safely removed
2642 */
2643 if (block)
2644 dasd_free_block(block);
1da177e4
LT		 2645 return 0;
2646}
2647
a4d26c6a
SW		 2648int dasd_generic_last_path_gone(struct dasd_device *device)
2649{
2650 struct dasd_ccw_req *cqr;
2651
2652 dev_warn(&device->cdev->dev, "No operational channel path is left "
2653 "for the device\n");
2654 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
2655 /* First of all call extended error reporting. */
2656 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
2657
2658 if (device->state < DASD_STATE_BASIC)
2659 return 0;
2660 /* Device is active. We want to keep it. */
2661 list_for_each_entry(cqr, &device->ccw_queue, devlist)
2662 if ((cqr->status == DASD_CQR_IN_IO) ||
2663 (cqr->status == DASD_CQR_CLEAR_PENDING)) {
2664 cqr->status = DASD_CQR_QUEUED;
2665 cqr->retries++;
2666 }
2667 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
2668 dasd_device_clear_timer(device);
2669 dasd_schedule_device_bh(device);
2670 return 1;
2671}
2672EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
2673
2674int dasd_generic_path_operational(struct dasd_device *device)
2675{
2676 dev_info(&device->cdev->dev, "A channel path to the device has become "
2677 "operational\n");
2678 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
2679 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
2680 if (device->stopped & DASD_UNRESUMED_PM) {
2681 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
2682 dasd_restore_device(device);
2683 return 1;
2684 }
2685 dasd_schedule_device_bh(device);
2686 if (device->block)
2687 dasd_schedule_block_bh(device->block);
2688 return 1;
2689}
2690EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
2691
8e09f215 2692int dasd_generic_notify(struct ccw_device *cdev, int event)
1da177e4
LT		 2693{
2694 struct dasd_device *device;
1da177e4
LT		 2695 int ret;
2696
91c36919 2697 device = dasd_device_from_cdev_locked(cdev);
1da177e4
LT		 2698 if (IS_ERR(device))
2699 return 0;
1da177e4
LT		 2700 ret = 0;
2701 switch (event) {
2702 case CIO_GONE:
47593bfa 2703 case CIO_BOXED:
1da177e4 2704 case CIO_NO_PATH:
a4d26c6a
SW		 2705 device->path_data.opm = 0;
2706 device->path_data.ppm = 0;
2707 device->path_data.npm = 0;
2708 ret = dasd_generic_last_path_gone(device);
1da177e4
LT		 2709 break;
2710 case CIO_OPER:
1da177e4 2711 ret = 1;
a4d26c6a
SW		 2712 if (device->path_data.opm)
2713 ret = dasd_generic_path_operational(device);
1da177e4
LT		 2714 break;
2715 }
1da177e4
LT		 2716 dasd_put_device(device);
2717 return ret;
2718}
2719
a4d26c6a
SW		 2720void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
2721{
2722 int chp;
2723 __u8 oldopm, eventlpm;
2724 struct dasd_device *device;
2725
2726 device = dasd_device_from_cdev_locked(cdev);
2727 if (IS_ERR(device))
2728 return;
2729 for (chp = 0; chp < 8; chp++) {
2730 eventlpm = 0x80 >> chp;
2731 if (path_event[chp] & PE_PATH_GONE) {
2732 oldopm = device->path_data.opm;
2733 device->path_data.opm &= ~eventlpm;
2734 device->path_data.ppm &= ~eventlpm;
2735 device->path_data.npm &= ~eventlpm;
2736 if (oldopm && !device->path_data.opm)
2737 dasd_generic_last_path_gone(device);
2738 }
2739 if (path_event[chp] & PE_PATH_AVAILABLE) {
2740 device->path_data.opm &= ~eventlpm;
2741 device->path_data.ppm &= ~eventlpm;
2742 device->path_data.npm &= ~eventlpm;
2743 device->path_data.tbvpm |= eventlpm;
2744 dasd_schedule_device_bh(device);
2745 }
2746 }
2747 dasd_put_device(device);
2748}
2749EXPORT_SYMBOL_GPL(dasd_generic_path_event);
2750
2751int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
2752{
2753 if (!device->path_data.opm && lpm) {
2754 device->path_data.opm = lpm;
2755 dasd_generic_path_operational(device);
2756 } else
2757 device->path_data.opm |= lpm;
2758 return 0;
2759}
2760EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
2761
2762
d41dd122
SH		 2763int dasd_generic_pm_freeze(struct ccw_device *cdev)
2764{
2765 struct dasd_ccw_req *cqr, *n;
2766 int rc;
2767 struct list_head freeze_queue;
2768 struct dasd_device *device = dasd_device_from_cdev(cdev);
2769
2770 if (IS_ERR(device))
2771 return PTR_ERR(device);
6f272b9c
SH		 2772
2773 if (device->discipline->freeze)
2774 rc = device->discipline->freeze(device);
2775
d41dd122 2776 /* disallow new I/O */
eb6e199b 2777 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
d41dd122
SH		 2778 /* clear active requests */
2779 INIT_LIST_HEAD(&freeze_queue);
2780 spin_lock_irq(get_ccwdev_lock(cdev));
2781 rc = 0;
2782 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
2783 /* Check status and move request to flush_queue */
2784 if (cqr->status == DASD_CQR_IN_IO) {
2785 rc = device->discipline->term_IO(cqr);
2786 if (rc) {
2787 /* unable to terminate requeust */
2788 dev_err(&device->cdev->dev,
2789 "Unable to terminate request %p "
2790 "on suspend\n", cqr);
2791 spin_unlock_irq(get_ccwdev_lock(cdev));
2792 dasd_put_device(device);
2793 return rc;
2794 }
2795 }
2796 list_move_tail(&cqr->devlist, &freeze_queue);
2797 }
2798
2799 spin_unlock_irq(get_ccwdev_lock(cdev));
2800
2801 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
2802 wait_event(dasd_flush_wq,
2803 (cqr->status != DASD_CQR_CLEAR_PENDING));
2804 if (cqr->status == DASD_CQR_CLEARED)
2805 cqr->status = DASD_CQR_QUEUED;
2806 }
2807 /* move freeze_queue to start of the ccw_queue */
2808 spin_lock_irq(get_ccwdev_lock(cdev));
2809 list_splice_tail(&freeze_queue, &device->ccw_queue);
2810 spin_unlock_irq(get_ccwdev_lock(cdev));
2811
d41dd122
SH		 2812 dasd_put_device(device);
2813 return rc;
2814}
2815EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
2816
2817int dasd_generic_restore_device(struct ccw_device *cdev)
2818{
2819 struct dasd_device *device = dasd_device_from_cdev(cdev);
2820 int rc = 0;
2821
2822 if (IS_ERR(device))
2823 return PTR_ERR(device);
2824
e6125fba 2825 /* allow new IO again */
eb6e199b
SW		 2826 dasd_device_remove_stop_bits(device,
2827 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
e6125fba 2828
d41dd122 2829 dasd_schedule_device_bh(device);
d41dd122 2830
eb6e199b
SW		 2831 /*
2832 * call discipline restore function
2833 * if device is stopped do nothing e.g. for disconnected devices
2834 */
2835 if (device->discipline->restore && !(device->stopped))
d41dd122 2836 rc = device->discipline->restore(device);
eb6e199b 2837 if (rc || device->stopped)
e6125fba
SH		 2838 /*
2839 * if the resume failed for the DASD we put it in
2840 * an UNRESUMED stop state
2841 */
2842 device->stopped |= DASD_UNRESUMED_PM;
d41dd122 2843
6fca97a9
SH		 2844 if (device->block)
2845 dasd_schedule_block_bh(device->block);
2846
d41dd122 2847 dasd_put_device(device);
e6125fba 2848 return 0;
d41dd122
SH		 2849}
2850EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
2851
763968e2
HC		 2852static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
2853 void *rdc_buffer,
2854 int rdc_buffer_size,
68b781fe 2855 int magic)
17283b56
CH		 2856{
2857 struct dasd_ccw_req *cqr;
2858 struct ccw1 *ccw;
d9fa9441 2859 unsigned long *idaw;
17283b56
CH		 2860
2861 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
2862
2863 if (IS_ERR(cqr)) {
fc19f381
SH		 2864 /* internal error 13 - Allocating the RDC request failed*/
2865 dev_err(&device->cdev->dev,
2866 "An error occurred in the DASD device driver, "
2867 "reason=%s\n", "13");
17283b56
CH		 2868 return cqr;
2869 }
2870
2871 ccw = cqr->cpaddr;
2872 ccw->cmd_code = CCW_CMD_RDC;
d9fa9441
SH		 2873 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
2874 idaw = (unsigned long *) (cqr->data);
2875 ccw->cda = (__u32)(addr_t) idaw;
2876 ccw->flags = CCW_FLAG_IDA;
2877 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
2878 } else {
2879 ccw->cda = (__u32)(addr_t) rdc_buffer;
2880 ccw->flags = 0;
2881 }
17283b56 2882
d9fa9441 2883 ccw->count = rdc_buffer_size;
8e09f215
SW		 2884 cqr->startdev = device;
2885 cqr->memdev = device;
17283b56 2886 cqr->expires = 10*HZ;
eb6e199b 2887 cqr->retries = 256;
17283b56
CH		 2888 cqr->buildclk = get_clock();
2889 cqr->status = DASD_CQR_FILLED;
2890 return cqr;
2891}
2892
2893
68b781fe 2894int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
92636b15 2895 void *rdc_buffer, int rdc_buffer_size)
17283b56
CH		 2896{
2897 int ret;
2898 struct dasd_ccw_req *cqr;
2899
92636b15 2900 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
17283b56
CH		 2901 magic);
2902 if (IS_ERR(cqr))
2903 return PTR_ERR(cqr);
2904
2905 ret = dasd_sleep_on(cqr);
8e09f215 2906 dasd_sfree_request(cqr, cqr->memdev);
17283b56
CH		 2907 return ret;
2908}
aaff0f64 2909EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
20c64468 2910
f3eb5384
SW		 2911/*
2912 * In command mode and transport mode we need to look for sense
2913 * data in different places. The sense data itself is allways
2914 * an array of 32 bytes, so we can unify the sense data access
2915 * for both modes.
2916 */
2917char *dasd_get_sense(struct irb *irb)
2918{
2919 struct tsb *tsb = NULL;
2920 char *sense = NULL;
2921
2922 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
2923 if (irb->scsw.tm.tcw)
2924 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
2925 irb->scsw.tm.tcw);
2926 if (tsb && tsb->length == 64 && tsb->flags)
2927 switch (tsb->flags & 0x07) {
2928 case 1: /* tsa_iostat */
2929 sense = tsb->tsa.iostat.sense;
2930 break;
2931 case 2: /* tsa_ddpc */
2932 sense = tsb->tsa.ddpc.sense;
2933 break;
2934 default:
2935 /* currently we don't use interrogate data */
2936 break;
2937 }
2938 } else if (irb->esw.esw0.erw.cons) {
2939 sense = irb->ecw;
2940 }
2941 return sense;
2942}
2943EXPORT_SYMBOL_GPL(dasd_get_sense);
2944
8e09f215 2945static int __init dasd_init(void)
1da177e4
LT		 2946{
2947 int rc;
2948
2949 init_waitqueue_head(&dasd_init_waitq);
8f61701b 2950 init_waitqueue_head(&dasd_flush_wq);
c80ee724 2951 init_waitqueue_head(&generic_waitq);
1da177e4
LT		 2952
2953 /* register 'common' DASD debug area, used for all DBF_XXX calls */
361f494d 2954 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
1da177e4
LT		 2955 if (dasd_debug_area == NULL) {
2956 rc = -ENOMEM;
2957 goto failed;
2958 }
2959 debug_register_view(dasd_debug_area, &debug_sprintf_view);
b0035f12 2960 debug_set_level(dasd_debug_area, DBF_WARNING);
1da177e4
LT		 2961
2962 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
2963
2964 dasd_diag_discipline_pointer = NULL;
2965
1da177e4
LT		 2966 rc = dasd_devmap_init();
2967 if (rc)
2968 goto failed;
2969 rc = dasd_gendisk_init();
2970 if (rc)
2971 goto failed;
2972 rc = dasd_parse();
2973 if (rc)
2974 goto failed;
20c64468
SW		 2975 rc = dasd_eer_init();
2976 if (rc)
2977 goto failed;
1da177e4
LT		 2978#ifdef CONFIG_PROC_FS
2979 rc = dasd_proc_init();
2980 if (rc)
2981 goto failed;
2982#endif
2983
2984 return 0;
2985failed:
fc19f381 2986 pr_info("The DASD device driver could not be initialized\n");
1da177e4
LT		 2987 dasd_exit();
2988 return rc;
2989}
2990
2991module_init(dasd_init);
2992module_exit(dasd_exit);
2993
2994EXPORT_SYMBOL(dasd_debug_area);
2995EXPORT_SYMBOL(dasd_diag_discipline_pointer);
2996
2997EXPORT_SYMBOL(dasd_add_request_head);
2998EXPORT_SYMBOL(dasd_add_request_tail);
2999EXPORT_SYMBOL(dasd_cancel_req);
8e09f215
SW		 3000EXPORT_SYMBOL(dasd_device_clear_timer);
3001EXPORT_SYMBOL(dasd_block_clear_timer);
1da177e4
LT		 3002EXPORT_SYMBOL(dasd_enable_device);
3003EXPORT_SYMBOL(dasd_int_handler);
3004EXPORT_SYMBOL(dasd_kfree_request);
3005EXPORT_SYMBOL(dasd_kick_device);
3006EXPORT_SYMBOL(dasd_kmalloc_request);
8e09f215
SW		 3007EXPORT_SYMBOL(dasd_schedule_device_bh);
3008EXPORT_SYMBOL(dasd_schedule_block_bh);
1da177e4 3009EXPORT_SYMBOL(dasd_set_target_state);
8e09f215
SW		 3010EXPORT_SYMBOL(dasd_device_set_timer);
3011EXPORT_SYMBOL(dasd_block_set_timer);
1da177e4
LT		 3012EXPORT_SYMBOL(dasd_sfree_request);
3013EXPORT_SYMBOL(dasd_sleep_on);
3014EXPORT_SYMBOL(dasd_sleep_on_immediatly);
3015EXPORT_SYMBOL(dasd_sleep_on_interruptible);
3016EXPORT_SYMBOL(dasd_smalloc_request);
3017EXPORT_SYMBOL(dasd_start_IO);
3018EXPORT_SYMBOL(dasd_term_IO);
3019
3020EXPORT_SYMBOL_GPL(dasd_generic_probe);
3021EXPORT_SYMBOL_GPL(dasd_generic_remove);
3022EXPORT_SYMBOL_GPL(dasd_generic_notify);
3023EXPORT_SYMBOL_GPL(dasd_generic_set_online);
3024EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
8e09f215
SW		 3025EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
3026EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
3027EXPORT_SYMBOL_GPL(dasd_alloc_block);
3028EXPORT_SYMBOL_GPL(dasd_free_block);
kernel source for telekom puls (alcatel/mediatek)