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block: initial patch for on-stack per-task plugging
[mirror_ubuntu-artful-kernel.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);
e4dbb0f2
SH		 372 if ((device->features & DASD_FEATURE_USERAW)) {
373 disk = device->block->gdp;
374 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
375 return 0;
376 }
1301809b
SW		 377 disk = device->block->bdev->bd_disk;
378 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
379 while ((part = disk_part_iter_next(&piter)))
380 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
381 disk_part_iter_exit(&piter);
382 }
1da177e4
LT		 383 return 0;
384}
385
386/*
387 * Stop the requeueing of requests again.
388 */
8e09f215 389static int dasd_state_online_to_ready(struct dasd_device *device)
1da177e4 390{
8e09f215 391 int rc;
1301809b
SW		 392 struct gendisk *disk;
393 struct disk_part_iter piter;
394 struct hd_struct *part;
8e09f215
SW		 395
396 if (device->discipline->online_to_ready) {
397 rc = device->discipline->online_to_ready(device);
398 if (rc)
399 return rc;
400 }
1da177e4 401 device->state = DASD_STATE_READY;
e4dbb0f2 402 if (device->block && !(device->features & DASD_FEATURE_USERAW)) {
1301809b
SW		 403 disk = device->block->bdev->bd_disk;
404 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
405 while ((part = disk_part_iter_next(&piter)))
406 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
407 disk_part_iter_exit(&piter);
408 }
8f61701b 409 return 0;
1da177e4
LT		 410}
411
412/*
413 * Device startup state changes.
414 */
8e09f215 415static int dasd_increase_state(struct dasd_device *device)
1da177e4
LT		 416{
417 int rc;
418
419 rc = 0;
420 if (device->state == DASD_STATE_NEW &&
421 device->target >= DASD_STATE_KNOWN)
422 rc = dasd_state_new_to_known(device);
423
424 if (!rc &&
425 device->state == DASD_STATE_KNOWN &&
426 device->target >= DASD_STATE_BASIC)
427 rc = dasd_state_known_to_basic(device);
428
429 if (!rc &&
430 device->state == DASD_STATE_BASIC &&
431 device->target >= DASD_STATE_READY)
432 rc = dasd_state_basic_to_ready(device);
433
39ccf95e
HH		 434 if (!rc &&
435 device->state == DASD_STATE_UNFMT &&
436 device->target > DASD_STATE_UNFMT)
437 rc = -EPERM;
438
1da177e4
LT		 439 if (!rc &&
440 device->state == DASD_STATE_READY &&
441 device->target >= DASD_STATE_ONLINE)
442 rc = dasd_state_ready_to_online(device);
443
444 return rc;
445}
446
447/*
448 * Device shutdown state changes.
449 */
8e09f215 450static int dasd_decrease_state(struct dasd_device *device)
1da177e4 451{
8f61701b
HH		 452 int rc;
453
454 rc = 0;
1da177e4
LT		 455 if (device->state == DASD_STATE_ONLINE &&
456 device->target <= DASD_STATE_READY)
8f61701b 457 rc = dasd_state_online_to_ready(device);
138c014d 458
8f61701b
HH		 459 if (!rc &&
460 device->state == DASD_STATE_READY &&
1da177e4 461 device->target <= DASD_STATE_BASIC)
8f61701b 462 rc = dasd_state_ready_to_basic(device);
90f0094d 463
8f61701b
HH		 464 if (!rc &&
465 device->state == DASD_STATE_UNFMT &&
90f0094d 466 device->target <= DASD_STATE_BASIC)
8f61701b 467 rc = dasd_state_unfmt_to_basic(device);
90f0094d 468
8f61701b
HH		 469 if (!rc &&
470 device->state == DASD_STATE_BASIC &&
1da177e4 471 device->target <= DASD_STATE_KNOWN)
8f61701b 472 rc = dasd_state_basic_to_known(device);
138c014d 473
8f61701b
HH		 474 if (!rc &&
475 device->state == DASD_STATE_KNOWN &&
1da177e4 476 device->target <= DASD_STATE_NEW)
8f61701b 477 rc = dasd_state_known_to_new(device);
1da177e4 478
8f61701b 479 return rc;
1da177e4
LT		 480}
481
482/*
483 * This is the main startup/shutdown routine.
484 */
8e09f215 485static void dasd_change_state(struct dasd_device *device)
1da177e4 486{
181d9522 487 int rc;
1da177e4
LT		 488
489 if (device->state == device->target)
490 /* Already where we want to go today... */
491 return;
492 if (device->state < device->target)
493 rc = dasd_increase_state(device);
494 else
495 rc = dasd_decrease_state(device);
181d9522
SO		 496 if (rc == -EAGAIN)
497 return;
498 if (rc)
499 device->target = device->state;
1da177e4 500
9eb25122 501 if (device->state == device->target)
1da177e4 502 wake_up(&dasd_init_waitq);
4dfd5c45
HH		 503
504 /* let user-space know that the device status changed */
505 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
1da177e4
LT		 506}
507
508/*
509 * Kick starter for devices that did not complete the startup/shutdown
510 * procedure or were sleeping because of a pending state.
511 * dasd_kick_device will schedule a call do do_kick_device to the kernel
512 * event daemon.
513 */
8e09f215 514static void do_kick_device(struct work_struct *work)
1da177e4 515{
4927b3f7 516 struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
9eb25122 517 mutex_lock(&device->state_mutex);
1da177e4 518 dasd_change_state(device);
9eb25122 519 mutex_unlock(&device->state_mutex);
8e09f215 520 dasd_schedule_device_bh(device);
1da177e4
LT		 521 dasd_put_device(device);
522}
523
8e09f215 524void dasd_kick_device(struct dasd_device *device)
1da177e4
LT		 525{
526 dasd_get_device(device);
527 /* queue call to dasd_kick_device to the kernel event daemon. */
528 schedule_work(&device->kick_work);
529}
530
501183f2
SH		 531/*
532 * dasd_reload_device will schedule a call do do_reload_device to the kernel
533 * event daemon.
534 */
535static void do_reload_device(struct work_struct *work)
536{
537 struct dasd_device *device = container_of(work, struct dasd_device,
538 reload_device);
539 device->discipline->reload(device);
540 dasd_put_device(device);
541}
542
543void dasd_reload_device(struct dasd_device *device)
544{
545 dasd_get_device(device);
546 /* queue call to dasd_reload_device to the kernel event daemon. */
547 schedule_work(&device->reload_device);
548}
549EXPORT_SYMBOL(dasd_reload_device);
550
d41dd122
SH		 551/*
552 * dasd_restore_device will schedule a call do do_restore_device to the kernel
553 * event daemon.
554 */
555static void do_restore_device(struct work_struct *work)
556{
557 struct dasd_device *device = container_of(work, struct dasd_device,
558 restore_device);
559 device->cdev->drv->restore(device->cdev);
560 dasd_put_device(device);
561}
562
563void dasd_restore_device(struct dasd_device *device)
564{
565 dasd_get_device(device);
566 /* queue call to dasd_restore_device to the kernel event daemon. */
567 schedule_work(&device->restore_device);
568}
569
1da177e4
LT		 570/*
571 * Set the target state for a device and starts the state change.
572 */
8e09f215 573void dasd_set_target_state(struct dasd_device *device, int target)
1da177e4 574{
f3445a1a 575 dasd_get_device(device);
9eb25122 576 mutex_lock(&device->state_mutex);
1da177e4
LT		 577 /* If we are in probeonly mode stop at DASD_STATE_READY. */
578 if (dasd_probeonly && target > DASD_STATE_READY)
579 target = DASD_STATE_READY;
580 if (device->target != target) {
9eb25122 581 if (device->state == target)
1da177e4
LT		 582 wake_up(&dasd_init_waitq);
583 device->target = target;
584 }
585 if (device->state != device->target)
586 dasd_change_state(device);
9eb25122
SH		 587 mutex_unlock(&device->state_mutex);
588 dasd_put_device(device);
1da177e4
LT		 589}
590
591/*
592 * Enable devices with device numbers in [from..to].
593 */
8e09f215 594static inline int _wait_for_device(struct dasd_device *device)
1da177e4
LT		 595{
596 return (device->state == device->target);
597}
598
8e09f215 599void dasd_enable_device(struct dasd_device *device)
1da177e4
LT		 600{
601 dasd_set_target_state(device, DASD_STATE_ONLINE);
602 if (device->state <= DASD_STATE_KNOWN)
603 /* No discipline for device found. */
604 dasd_set_target_state(device, DASD_STATE_NEW);
605 /* Now wait for the devices to come up. */
606 wait_event(dasd_init_waitq, _wait_for_device(device));
607}
608
609/*
610 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
611 */
612#ifdef CONFIG_DASD_PROFILE
613
614struct dasd_profile_info_t dasd_global_profile;
615unsigned int dasd_profile_level = DASD_PROFILE_OFF;
616
617/*
618 * Increments counter in global and local profiling structures.
619 */
8e09f215 620#define dasd_profile_counter(value, counter, block) \
1da177e4
LT		 621{ \
622 int index; \
623 for (index = 0; index < 31 && value >> (2+index); index++); \
624 dasd_global_profile.counter[index]++; \
8e09f215 625 block->profile.counter[index]++; \
1da177e4
LT		 626}
627
628/*
629 * Add profiling information for cqr before execution.
630 */
8e09f215
SW		 631static void dasd_profile_start(struct dasd_block *block,
632 struct dasd_ccw_req *cqr,
633 struct request *req)
1da177e4
LT		 634{
635 struct list_head *l;
636 unsigned int counter;
637
638 if (dasd_profile_level != DASD_PROFILE_ON)
639 return;
640
641 /* count the length of the chanq for statistics */
642 counter = 0;
8e09f215 643 list_for_each(l, &block->ccw_queue)
1da177e4
LT		 644 if (++counter >= 31)
645 break;
646 dasd_global_profile.dasd_io_nr_req[counter]++;
8e09f215 647 block->profile.dasd_io_nr_req[counter]++;
1da177e4
LT		 648}
649
650/*
651 * Add profiling information for cqr after execution.
652 */
8e09f215
SW		 653static void dasd_profile_end(struct dasd_block *block,
654 struct dasd_ccw_req *cqr,
655 struct request *req)
1da177e4
LT		 656{
657 long strtime, irqtime, endtime, tottime; /* in microseconds */
658 long tottimeps, sectors;
659
660 if (dasd_profile_level != DASD_PROFILE_ON)
661 return;
662
83096ebf 663 sectors = blk_rq_sectors(req);
1da177e4
LT		 664 if (!cqr->buildclk || !cqr->startclk ||
665 !cqr->stopclk || !cqr->endclk ||
666 !sectors)
667 return;
668
669 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
670 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
671 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
672 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
673 tottimeps = tottime / sectors;
674
675 if (!dasd_global_profile.dasd_io_reqs)
676 memset(&dasd_global_profile, 0,
8e09f215 677 sizeof(struct dasd_profile_info_t));
1da177e4
LT		 678 dasd_global_profile.dasd_io_reqs++;
679 dasd_global_profile.dasd_io_sects += sectors;
680
8e09f215
SW		 681 if (!block->profile.dasd_io_reqs)
682 memset(&block->profile, 0,
683 sizeof(struct dasd_profile_info_t));
684 block->profile.dasd_io_reqs++;
685 block->profile.dasd_io_sects += sectors;
1da177e4 686
8e09f215
SW		 687 dasd_profile_counter(sectors, dasd_io_secs, block);
688 dasd_profile_counter(tottime, dasd_io_times, block);
689 dasd_profile_counter(tottimeps, dasd_io_timps, block);
690 dasd_profile_counter(strtime, dasd_io_time1, block);
691 dasd_profile_counter(irqtime, dasd_io_time2, block);
692 dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, block);
693 dasd_profile_counter(endtime, dasd_io_time3, block);
1da177e4
LT		 694}
695#else
8e09f215
SW		 696#define dasd_profile_start(block, cqr, req) do {} while (0)
697#define dasd_profile_end(block, cqr, req) do {} while (0)
1da177e4
LT		 698#endif /* CONFIG_DASD_PROFILE */
699
700/*
701 * Allocate memory for a channel program with 'cplength' channel
702 * command words and 'datasize' additional space. There are two
703 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
704 * memory and 2) dasd_smalloc_request uses the static ccw memory
705 * that gets allocated for each device.
706 */
68b781fe 707struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
8e09f215
SW		 708 int datasize,
709 struct dasd_device *device)
1da177e4
LT		 710{
711 struct dasd_ccw_req *cqr;
712
713 /* Sanity checks */
68b781fe 714 BUG_ON(datasize > PAGE_SIZE ||
7ac1e877 715 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
1da177e4 716
88abaab4 717 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
1da177e4
LT		 718 if (cqr == NULL)
719 return ERR_PTR(-ENOMEM);
1da177e4
LT		 720 cqr->cpaddr = NULL;
721 if (cplength > 0) {
88abaab4 722 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
1da177e4
LT		 723 GFP_ATOMIC | GFP_DMA);
724 if (cqr->cpaddr == NULL) {
725 kfree(cqr);
726 return ERR_PTR(-ENOMEM);
727 }
1da177e4
LT		 728 }
729 cqr->data = NULL;
730 if (datasize > 0) {
88abaab4 731 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
1da177e4 732 if (cqr->data == NULL) {
17fd682e 733 kfree(cqr->cpaddr);
1da177e4
LT		 734 kfree(cqr);
735 return ERR_PTR(-ENOMEM);
736 }
1da177e4 737 }
68b781fe 738 cqr->magic = magic;
1da177e4
LT		 739 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
740 dasd_get_device(device);
741 return cqr;
742}
743
68b781fe 744struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
8e09f215
SW		 745 int datasize,
746 struct dasd_device *device)
1da177e4
LT		 747{
748 unsigned long flags;
749 struct dasd_ccw_req *cqr;
750 char *data;
751 int size;
752
1da177e4
LT		 753 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
754 if (cplength > 0)
755 size += cplength * sizeof(struct ccw1);
756 if (datasize > 0)
757 size += datasize;
758 spin_lock_irqsave(&device->mem_lock, flags);
759 cqr = (struct dasd_ccw_req *)
760 dasd_alloc_chunk(&device->ccw_chunks, size);
761 spin_unlock_irqrestore(&device->mem_lock, flags);
762 if (cqr == NULL)
763 return ERR_PTR(-ENOMEM);
764 memset(cqr, 0, sizeof(struct dasd_ccw_req));
765 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
766 cqr->cpaddr = NULL;
767 if (cplength > 0) {
768 cqr->cpaddr = (struct ccw1 *) data;
769 data += cplength*sizeof(struct ccw1);
770 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
771 }
772 cqr->data = NULL;
773 if (datasize > 0) {
774 cqr->data = data;
775 memset(cqr->data, 0, datasize);
776 }
68b781fe 777 cqr->magic = magic;
1da177e4
LT		 778 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
779 dasd_get_device(device);
780 return cqr;
781}
782
783/*
784 * Free memory of a channel program. This function needs to free all the
785 * idal lists that might have been created by dasd_set_cda and the
786 * struct dasd_ccw_req itself.
787 */
8e09f215 788void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1da177e4 789{
347a8dc3 790#ifdef CONFIG_64BIT
1da177e4
LT		 791 struct ccw1 *ccw;
792
793 /* Clear any idals used for the request. */
794 ccw = cqr->cpaddr;
795 do {
796 clear_normalized_cda(ccw);
797 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
798#endif
17fd682e
JJ		 799 kfree(cqr->cpaddr);
800 kfree(cqr->data);
1da177e4
LT		 801 kfree(cqr);
802 dasd_put_device(device);
803}
804
8e09f215 805void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1da177e4
LT		 806{
807 unsigned long flags;
808
809 spin_lock_irqsave(&device->mem_lock, flags);
810 dasd_free_chunk(&device->ccw_chunks, cqr);
811 spin_unlock_irqrestore(&device->mem_lock, flags);
812 dasd_put_device(device);
813}
814
815/*
816 * Check discipline magic in cqr.
817 */
8e09f215 818static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
1da177e4
LT		 819{
820 struct dasd_device *device;
821
822 if (cqr == NULL)
823 return -EINVAL;
8e09f215 824 device = cqr->startdev;
1da177e4 825 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
fc19f381 826 DBF_DEV_EVENT(DBF_WARNING, device,
1da177e4
LT		 827 " dasd_ccw_req 0x%08x magic doesn't match"
828 " discipline 0x%08x",
829 cqr->magic,
830 *(unsigned int *) device->discipline->name);
831 return -EINVAL;
832 }
833 return 0;
834}
835
836/*
837 * Terminate the current i/o and set the request to clear_pending.
838 * Timer keeps device runnig.
839 * ccw_device_clear can fail if the i/o subsystem
840 * is in a bad mood.
841 */
8e09f215 842int dasd_term_IO(struct dasd_ccw_req *cqr)
1da177e4
LT		 843{
844 struct dasd_device *device;
845 int retries, rc;
fc19f381 846 char errorstring[ERRORLENGTH];
1da177e4
LT		 847
848 /* Check the cqr */
849 rc = dasd_check_cqr(cqr);
850 if (rc)
851 return rc;
852 retries = 0;
8e09f215 853 device = (struct dasd_device *) cqr->startdev;
1da177e4
LT		 854 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
855 rc = ccw_device_clear(device->cdev, (long) cqr);
856 switch (rc) {
857 case 0: /* termination successful */
8e09f215 858 cqr->status = DASD_CQR_CLEAR_PENDING;
1da177e4 859 cqr->stopclk = get_clock();
8f61701b 860 cqr->starttime = 0;
1da177e4
LT		 861 DBF_DEV_EVENT(DBF_DEBUG, device,
862 "terminate cqr %p successful",
863 cqr);
864 break;
865 case -ENODEV:
866 DBF_DEV_EVENT(DBF_ERR, device, "%s",
867 "device gone, retry");
868 break;
869 case -EIO:
870 DBF_DEV_EVENT(DBF_ERR, device, "%s",
871 "I/O error, retry");
872 break;
873 case -EINVAL:
874 case -EBUSY:
875 DBF_DEV_EVENT(DBF_ERR, device, "%s",
876 "device busy, retry later");
877 break;
878 default:
fc19f381
SH		 879 /* internal error 10 - unknown rc*/
880 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
881 dev_err(&device->cdev->dev, "An error occurred in the "
882 "DASD device driver, reason=%s\n", errorstring);
1da177e4
LT		 883 BUG();
884 break;
885 }
886 retries++;
887 }
8e09f215 888 dasd_schedule_device_bh(device);
1da177e4
LT		 889 return rc;
890}
891
892/*
893 * Start the i/o. This start_IO can fail if the channel is really busy.
894 * In that case set up a timer to start the request later.
895 */
8e09f215 896int dasd_start_IO(struct dasd_ccw_req *cqr)
1da177e4
LT		 897{
898 struct dasd_device *device;
899 int rc;
fc19f381 900 char errorstring[ERRORLENGTH];
1da177e4
LT		 901
902 /* Check the cqr */
903 rc = dasd_check_cqr(cqr);
6cc7f168
SW		 904 if (rc) {
905 cqr->intrc = rc;
1da177e4 906 return rc;
6cc7f168 907 }
8e09f215 908 device = (struct dasd_device *) cqr->startdev;
5a27e60d
SW		 909 if (((cqr->block &&
910 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) ||
911 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) &&
912 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
913 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p "
914 "because of stolen lock", cqr);
915 cqr->status = DASD_CQR_ERROR;
916 cqr->intrc = -EPERM;
917 return -EPERM;
918 }
1da177e4 919 if (cqr->retries < 0) {
fc19f381
SH		 920 /* internal error 14 - start_IO run out of retries */
921 sprintf(errorstring, "14 %p", cqr);
922 dev_err(&device->cdev->dev, "An error occurred in the DASD "
923 "device driver, reason=%s\n", errorstring);
8e09f215 924 cqr->status = DASD_CQR_ERROR;
1da177e4
LT		 925 return -EIO;
926 }
927 cqr->startclk = get_clock();
928 cqr->starttime = jiffies;
929 cqr->retries--;
a4d26c6a
SW		 930 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
931 cqr->lpm &= device->path_data.opm;
932 if (!cqr->lpm)
933 cqr->lpm = device->path_data.opm;
934 }
f3eb5384
SW		 935 if (cqr->cpmode == 1) {
936 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
937 (long) cqr, cqr->lpm);
938 } else {
939 rc = ccw_device_start(device->cdev, cqr->cpaddr,
940 (long) cqr, cqr->lpm, 0);
941 }
1da177e4
LT		 942 switch (rc) {
943 case 0:
944 cqr->status = DASD_CQR_IN_IO;
1da177e4
LT		 945 break;
946 case -EBUSY:
a4d26c6a 947 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1da177e4
LT		 948 "start_IO: device busy, retry later");
949 break;
950 case -ETIMEDOUT:
a4d26c6a 951 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1da177e4
LT		 952 "start_IO: request timeout, retry later");
953 break;
954 case -EACCES:
a4d26c6a
SW		 955 /* -EACCES indicates that the request used only a subset of the
956 * available paths and all these paths are gone. If the lpm of
957 * this request was only a subset of the opm (e.g. the ppm) then
958 * we just do a retry with all available paths.
959 * If we already use the full opm, something is amiss, and we
960 * need a full path verification.
1da177e4 961 */
a4d26c6a
SW		 962 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
963 DBF_DEV_EVENT(DBF_WARNING, device,
964 "start_IO: selected paths gone (%x)",
965 cqr->lpm);
966 } else if (cqr->lpm != device->path_data.opm) {
967 cqr->lpm = device->path_data.opm;
968 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
969 "start_IO: selected paths gone,"
970 " retry on all paths");
971 } else {
972 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
973 "start_IO: all paths in opm gone,"
974 " do path verification");
975 dasd_generic_last_path_gone(device);
976 device->path_data.opm = 0;
977 device->path_data.ppm = 0;
978 device->path_data.npm = 0;
979 device->path_data.tbvpm =
980 ccw_device_get_path_mask(device->cdev);
981 }
1da177e4
LT		 982 break;
983 case -ENODEV:
a4d26c6a 984 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
f3eb5384
SW		 985 "start_IO: -ENODEV device gone, retry");
986 break;
1da177e4 987 case -EIO:
a4d26c6a 988 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
f3eb5384 989 "start_IO: -EIO device gone, retry");
1da177e4 990 break;
d41dd122
SH		 991 case -EINVAL:
992 /* most likely caused in power management context */
a4d26c6a 993 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
d41dd122
SH		 994 "start_IO: -EINVAL device currently "
995 "not accessible");
996 break;
1da177e4 997 default:
fc19f381
SH		 998 /* internal error 11 - unknown rc */
999 snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
1000 dev_err(&device->cdev->dev,
1001 "An error occurred in the DASD device driver, "
1002 "reason=%s\n", errorstring);
1da177e4
LT		 1003 BUG();
1004 break;
1005 }
6cc7f168 1006 cqr->intrc = rc;
1da177e4
LT		 1007 return rc;
1008}
1009
1010/*
1011 * Timeout function for dasd devices. This is used for different purposes
1012 * 1) missing interrupt handler for normal operation
1013 * 2) delayed start of request where start_IO failed with -EBUSY
1014 * 3) timeout for missing state change interrupts
1015 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
1016 * DASD_CQR_QUEUED for 2) and 3).
1017 */
8e09f215 1018static void dasd_device_timeout(unsigned long ptr)
1da177e4
LT		 1019{
1020 unsigned long flags;
1021 struct dasd_device *device;
1022
1023 device = (struct dasd_device *) ptr;
1024 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1025 /* re-activate request queue */
eb6e199b 1026 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1da177e4 1027 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
8e09f215 1028 dasd_schedule_device_bh(device);
1da177e4
LT		 1029}
1030
1031/*
1032 * Setup timeout for a device in jiffies.
1033 */
8e09f215 1034void dasd_device_set_timer(struct dasd_device *device, int expires)
1da177e4 1035{
48cae885
SW		 1036 if (expires == 0)
1037 del_timer(&device->timer);
1038 else
1039 mod_timer(&device->timer, jiffies + expires);
1da177e4
LT		 1040}
1041
1042/*
1043 * Clear timeout for a device.
1044 */
8e09f215 1045void dasd_device_clear_timer(struct dasd_device *device)
1da177e4 1046{
48cae885 1047 del_timer(&device->timer);
1da177e4
LT		 1048}
1049
8e09f215
SW		 1050static void dasd_handle_killed_request(struct ccw_device *cdev,
1051 unsigned long intparm)
1da177e4
LT		 1052{
1053 struct dasd_ccw_req *cqr;
1054 struct dasd_device *device;
1055
f16f5843
SW		 1056 if (!intparm)
1057 return;
1da177e4
LT		 1058 cqr = (struct dasd_ccw_req *) intparm;
1059 if (cqr->status != DASD_CQR_IN_IO) {
b8ed5dd5
SH		 1060 DBF_EVENT_DEVID(DBF_DEBUG, cdev,
1061 "invalid status in handle_killed_request: "
1062 "%02x", cqr->status);
1da177e4
LT		 1063 return;
1064 }
1065
589c74d5
SH		 1066 device = dasd_device_from_cdev_locked(cdev);
1067 if (IS_ERR(device)) {
1068 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1069 "unable to get device from cdev");
1070 return;
1071 }
1072
1073 if (!cqr->startdev ||
1074 device != cqr->startdev ||
1075 strncmp(cqr->startdev->discipline->ebcname,
1076 (char *) &cqr->magic, 4)) {
294001a8
SH		 1077 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1078 "invalid device in request");
589c74d5 1079 dasd_put_device(device);
1da177e4
LT		 1080 return;
1081 }
1082
1083 /* Schedule request to be retried. */
1084 cqr->status = DASD_CQR_QUEUED;
1085
8e09f215
SW		 1086 dasd_device_clear_timer(device);
1087 dasd_schedule_device_bh(device);
1da177e4
LT		 1088 dasd_put_device(device);
1089}
1090
8e09f215 1091void dasd_generic_handle_state_change(struct dasd_device *device)
1da177e4 1092{
20c64468
SW		 1093 /* First of all start sense subsystem status request. */
1094 dasd_eer_snss(device);
1095
eb6e199b 1096 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
8e09f215
SW		 1097 dasd_schedule_device_bh(device);
1098 if (device->block)
1099 dasd_schedule_block_bh(device->block);
1da177e4
LT		 1100}
1101
1102/*
1103 * Interrupt handler for "normal" ssch-io based dasd devices.
1104 */
8e09f215
SW		 1105void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1106 struct irb *irb)
1da177e4
LT		 1107{
1108 struct dasd_ccw_req *cqr, *next;
1109 struct dasd_device *device;
1110 unsigned long long now;
1111 int expires;
1da177e4 1112
3283942b 1113 kstat_cpu(smp_processor_id()).irqs[IOINT_DAS]++;
1da177e4
LT		 1114 if (IS_ERR(irb)) {
1115 switch (PTR_ERR(irb)) {
1116 case -EIO:
1da177e4
LT		 1117 break;
1118 case -ETIMEDOUT:
b8ed5dd5
SH		 1119 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1120 "request timed out\n", __func__);
1da177e4
LT		 1121 break;
1122 default:
b8ed5dd5
SH		 1123 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1124 "unknown error %ld\n", __func__,
1125 PTR_ERR(irb));
1da177e4 1126 }
f16f5843 1127 dasd_handle_killed_request(cdev, intparm);
1da177e4
LT		 1128 return;
1129 }
1130
1131 now = get_clock();
8e09f215 1132 cqr = (struct dasd_ccw_req *) intparm;
5a27e60d
SW		 1133 /* check for conditions that should be handled immediately */
1134 if (!cqr ||
1135 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1136 scsw_cstat(&irb->scsw) == 0)) {
a5a0061f
SW		 1137 if (cqr)
1138 memcpy(&cqr->irb, irb, sizeof(*irb));
a00bfd71 1139 device = dasd_device_from_cdev_locked(cdev);
56b86b61
SH		 1140 if (IS_ERR(device))
1141 return;
1142 /* ignore unsolicited interrupts for DIAG discipline */
1143 if (device->discipline == dasd_diag_discipline_pointer) {
1da177e4 1144 dasd_put_device(device);
56b86b61 1145 return;
1da177e4 1146 }
5a27e60d
SW		 1147 device->discipline->dump_sense_dbf(device, irb, "int");
1148 if (device->features & DASD_FEATURE_ERPLOG)
1149 device->discipline->dump_sense(device, cqr, irb);
1150 device->discipline->check_for_device_change(device, cqr, irb);
56b86b61 1151 dasd_put_device(device);
1da177e4 1152 }
5a27e60d
SW		 1153 if (!cqr)
1154 return;
1da177e4 1155
8e09f215
SW		 1156 device = (struct dasd_device *) cqr->startdev;
1157 if (!device ||
1da177e4 1158 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
294001a8
SH		 1159 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1160 "invalid device in request");
1da177e4
LT		 1161 return;
1162 }
1163
1164 /* Check for clear pending */
8e09f215 1165 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
f3eb5384 1166 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
8e09f215
SW		 1167 cqr->status = DASD_CQR_CLEARED;
1168 dasd_device_clear_timer(device);
8f61701b 1169 wake_up(&dasd_flush_wq);
8e09f215 1170 dasd_schedule_device_bh(device);
1da177e4
LT		 1171 return;
1172 }
1173
f3eb5384 1174 /* check status - the request might have been killed by dyn detach */
1da177e4 1175 if (cqr->status != DASD_CQR_IN_IO) {
fc19f381
SH		 1176 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1177 "status %02x", dev_name(&cdev->dev), cqr->status);
1da177e4
LT		 1178 return;
1179 }
fc19f381 1180
8e09f215 1181 next = NULL;
1da177e4 1182 expires = 0;
f3eb5384
SW		 1183 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1184 scsw_cstat(&irb->scsw) == 0) {
8e09f215
SW		 1185 /* request was completed successfully */
1186 cqr->status = DASD_CQR_SUCCESS;
1da177e4
LT		 1187 cqr->stopclk = now;
1188 /* Start first request on queue if possible -> fast_io. */
8e09f215
SW		 1189 if (cqr->devlist.next != &device->ccw_queue) {
1190 next = list_entry(cqr->devlist.next,
1191 struct dasd_ccw_req, devlist);
1da177e4 1192 }
8e09f215 1193 } else { /* error */
6c5f57c7
SH		 1194 /*
1195 * If we don't want complex ERP for this request, then just
1196 * reset this and retry it in the fastpath
8e09f215 1197 */
6c5f57c7 1198 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
8e09f215 1199 cqr->retries > 0) {
a4d26c6a 1200 if (cqr->lpm == device->path_data.opm)
fc19f381
SH		 1201 DBF_DEV_EVENT(DBF_DEBUG, device,
1202 "default ERP in fastpath "
1203 "(%i retries left)",
1204 cqr->retries);
a4d26c6a
SW		 1205 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
1206 cqr->lpm = device->path_data.opm;
8e09f215
SW		 1207 cqr->status = DASD_CQR_QUEUED;
1208 next = cqr;
1209 } else
1da177e4 1210 cqr->status = DASD_CQR_ERROR;
8e09f215
SW		 1211 }
1212 if (next && (next->status == DASD_CQR_QUEUED) &&
1213 (!device->stopped)) {
1214 if (device->discipline->start_IO(next) == 0)
1215 expires = next->expires;
1da177e4
LT		 1216 }
1217 if (expires != 0)
8e09f215 1218 dasd_device_set_timer(device, expires);
1da177e4 1219 else
8e09f215
SW		 1220 dasd_device_clear_timer(device);
1221 dasd_schedule_device_bh(device);
1da177e4
LT		 1222}
1223
a23ed009
SH		 1224enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
1225{
1226 struct dasd_device *device;
1227
1228 device = dasd_device_from_cdev_locked(cdev);
1229
1230 if (IS_ERR(device))
1231 goto out;
1232 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1233 device->state != device->target ||
5a27e60d 1234 !device->discipline->check_for_device_change){
a23ed009
SH		 1235 dasd_put_device(device);
1236 goto out;
1237 }
5a27e60d
SW		 1238 if (device->discipline->dump_sense_dbf)
1239 device->discipline->dump_sense_dbf(device, irb, "uc");
1240 device->discipline->check_for_device_change(device, NULL, irb);
a23ed009
SH		 1241 dasd_put_device(device);
1242out:
1243 return UC_TODO_RETRY;
1244}
1245EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
1246
1da177e4 1247/*
8e09f215
SW		 1248 * If we have an error on a dasd_block layer request then we cancel
1249 * and return all further requests from the same dasd_block as well.
1da177e4 1250 */
8e09f215
SW		 1251static void __dasd_device_recovery(struct dasd_device *device,
1252 struct dasd_ccw_req *ref_cqr)
1da177e4 1253{
8e09f215
SW		 1254 struct list_head *l, *n;
1255 struct dasd_ccw_req *cqr;
1da177e4 1256
8e09f215
SW		 1257 /*
1258 * only requeue request that came from the dasd_block layer
1259 */
1260 if (!ref_cqr->block)
1261 return;
1da177e4 1262
8e09f215
SW		 1263 list_for_each_safe(l, n, &device->ccw_queue) {
1264 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1265 if (cqr->status == DASD_CQR_QUEUED &&
1266 ref_cqr->block == cqr->block) {
1267 cqr->status = DASD_CQR_CLEARED;
1268 }
1269 }
1270};
1da177e4
LT		 1271
1272/*
8e09f215
SW		 1273 * Remove those ccw requests from the queue that need to be returned
1274 * to the upper layer.
1da177e4 1275 */
8e09f215
SW		 1276static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1277 struct list_head *final_queue)
1da177e4
LT		 1278{
1279 struct list_head *l, *n;
1280 struct dasd_ccw_req *cqr;
1da177e4 1281
1da177e4
LT		 1282 /* Process request with final status. */
1283 list_for_each_safe(l, n, &device->ccw_queue) {
8e09f215
SW		 1284 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1285
1da177e4 1286 /* Stop list processing at the first non-final request. */
8e09f215
SW		 1287 if (cqr->status == DASD_CQR_QUEUED ||
1288 cqr->status == DASD_CQR_IN_IO ||
1289 cqr->status == DASD_CQR_CLEAR_PENDING)
1da177e4 1290 break;
1da177e4 1291 if (cqr->status == DASD_CQR_ERROR) {
8e09f215 1292 __dasd_device_recovery(device, cqr);
20c64468 1293 }
1da177e4 1294 /* Rechain finished requests to final queue */
8e09f215 1295 list_move_tail(&cqr->devlist, final_queue);
1da177e4
LT		 1296 }
1297}
1298
1da177e4 1299/*
8e09f215
SW		 1300 * the cqrs from the final queue are returned to the upper layer
1301 * by setting a dasd_block state and calling the callback function
1da177e4 1302 */
8e09f215
SW		 1303static void __dasd_device_process_final_queue(struct dasd_device *device,
1304 struct list_head *final_queue)
1da177e4 1305{
8e09f215 1306 struct list_head *l, *n;
1da177e4 1307 struct dasd_ccw_req *cqr;
03513bcc 1308 struct dasd_block *block;
c80ee724
SH		 1309 void (*callback)(struct dasd_ccw_req *, void *data);
1310 void *callback_data;
fc19f381 1311 char errorstring[ERRORLENGTH];
f24acd45 1312
8e09f215
SW		 1313 list_for_each_safe(l, n, final_queue) {
1314 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1315 list_del_init(&cqr->devlist);
03513bcc 1316 block = cqr->block;
c80ee724
SH		 1317 callback = cqr->callback;
1318 callback_data = cqr->callback_data;
03513bcc
SW		 1319 if (block)
1320 spin_lock_bh(&block->queue_lock);
8e09f215
SW		 1321 switch (cqr->status) {
1322 case DASD_CQR_SUCCESS:
1323 cqr->status = DASD_CQR_DONE;
1324 break;
1325 case DASD_CQR_ERROR:
1326 cqr->status = DASD_CQR_NEED_ERP;
1327 break;
1328 case DASD_CQR_CLEARED:
1329 cqr->status = DASD_CQR_TERMINATED;
1330 break;
1331 default:
fc19f381
SH		 1332 /* internal error 12 - wrong cqr status*/
1333 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1334 dev_err(&device->cdev->dev,
1335 "An error occurred in the DASD device driver, "
1336 "reason=%s\n", errorstring);
8e09f215 1337 BUG();
1da177e4 1338 }
8e09f215 1339 if (cqr->callback != NULL)
c80ee724 1340 (callback)(cqr, callback_data);
03513bcc
SW		 1341 if (block)
1342 spin_unlock_bh(&block->queue_lock);
1da177e4
LT		 1343 }
1344}
1345
1346/*
1347 * Take a look at the first request on the ccw queue and check
1348 * if it reached its expire time. If so, terminate the IO.
1349 */
8e09f215 1350static void __dasd_device_check_expire(struct dasd_device *device)
1da177e4
LT		 1351{
1352 struct dasd_ccw_req *cqr;
1353
1354 if (list_empty(&device->ccw_queue))
1355 return;
8e09f215 1356 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
29145a6c
HH		 1357 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1358 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
1359 if (device->discipline->term_IO(cqr) != 0) {
1360 /* Hmpf, try again in 5 sec */
fc19f381 1361 dev_err(&device->cdev->dev,
625c94df 1362 "cqr %p timed out (%lus) but cannot be "
fc19f381
SH		 1363 "ended, retrying in 5 s\n",
1364 cqr, (cqr->expires/HZ));
7dc1da9f
SH		 1365 cqr->expires += 5*HZ;
1366 dasd_device_set_timer(device, 5*HZ);
29145a6c 1367 } else {
fc19f381 1368 dev_err(&device->cdev->dev,
625c94df 1369 "cqr %p timed out (%lus), %i retries "
fc19f381
SH		 1370 "remaining\n", cqr, (cqr->expires/HZ),
1371 cqr->retries);
1da177e4
LT		 1372 }
1373 }
1374}
1375
1376/*
1377 * Take a look at the first request on the ccw queue and check
1378 * if it needs to be started.
1379 */
8e09f215 1380static void __dasd_device_start_head(struct dasd_device *device)
1da177e4
LT		 1381{
1382 struct dasd_ccw_req *cqr;
1383 int rc;
1384
1385 if (list_empty(&device->ccw_queue))
1386 return;
8e09f215 1387 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
25ee4cf8
PO		 1388 if (cqr->status != DASD_CQR_QUEUED)
1389 return;
a4d26c6a
SW		 1390 /* when device is stopped, return request to previous layer
1391 * exception: only the disconnect or unresumed bits are set and the
1392 * cqr is a path verification request
1393 */
1394 if (device->stopped &&
1395 !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
1396 && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) {
1397 cqr->intrc = -EAGAIN;
8e09f215
SW		 1398 cqr->status = DASD_CQR_CLEARED;
1399 dasd_schedule_device_bh(device);
25ee4cf8 1400 return;
1c01b8a5 1401 }
25ee4cf8
PO		 1402
1403 rc = device->discipline->start_IO(cqr);
1404 if (rc == 0)
8e09f215 1405 dasd_device_set_timer(device, cqr->expires);
25ee4cf8 1406 else if (rc == -EACCES) {
8e09f215 1407 dasd_schedule_device_bh(device);
25ee4cf8
PO		 1408 } else
1409 /* Hmpf, try again in 1/2 sec */
8e09f215 1410 dasd_device_set_timer(device, 50);
8f61701b
HH		 1411}
1412
a4d26c6a
SW		 1413static void __dasd_device_check_path_events(struct dasd_device *device)
1414{
1415 int rc;
1416
1417 if (device->path_data.tbvpm) {
1418 if (device->stopped & ~(DASD_STOPPED_DC_WAIT |
1419 DASD_UNRESUMED_PM))
1420 return;
1421 rc = device->discipline->verify_path(
1422 device, device->path_data.tbvpm);
1423 if (rc)
1424 dasd_device_set_timer(device, 50);
1425 else
1426 device->path_data.tbvpm = 0;
1427 }
1428};
1429
1da177e4 1430/*
8e09f215
SW		 1431 * Go through all request on the dasd_device request queue,
1432 * terminate them on the cdev if necessary, and return them to the
1433 * submitting layer via callback.
1434 * Note:
1435 * Make sure that all 'submitting layers' still exist when
1436 * this function is called!. In other words, when 'device' is a base
1437 * device then all block layer requests must have been removed before
1438 * via dasd_flush_block_queue.
1da177e4 1439 */
8e09f215 1440int dasd_flush_device_queue(struct dasd_device *device)
1da177e4 1441{
8e09f215
SW		 1442 struct dasd_ccw_req *cqr, *n;
1443 int rc;
1da177e4 1444 struct list_head flush_queue;
1da177e4
LT		 1445
1446 INIT_LIST_HEAD(&flush_queue);
1447 spin_lock_irq(get_ccwdev_lock(device->cdev));
8f61701b 1448 rc = 0;
8e09f215 1449 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
8f61701b
HH		 1450 /* Check status and move request to flush_queue */
1451 switch (cqr->status) {
1452 case DASD_CQR_IN_IO:
1453 rc = device->discipline->term_IO(cqr);
1454 if (rc) {
1455 /* unable to terminate requeust */
fc19f381
SH		 1456 dev_err(&device->cdev->dev,
1457 "Flushing the DASD request queue "
1458 "failed for request %p\n", cqr);
8f61701b
HH		 1459 /* stop flush processing */
1460 goto finished;
1461 }
1462 break;
1463 case DASD_CQR_QUEUED:
1da177e4 1464 cqr->stopclk = get_clock();
8e09f215 1465 cqr->status = DASD_CQR_CLEARED;
8f61701b 1466 break;
8e09f215 1467 default: /* no need to modify the others */
8f61701b
HH		 1468 break;
1469 }
8e09f215 1470 list_move_tail(&cqr->devlist, &flush_queue);
8f61701b 1471 }
8f61701b
HH		 1472finished:
1473 spin_unlock_irq(get_ccwdev_lock(device->cdev));
8e09f215
SW		 1474 /*
1475 * After this point all requests must be in state CLEAR_PENDING,
1476 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
1477 * one of the others.
1478 */
1479 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
1480 wait_event(dasd_flush_wq,
1481 (cqr->status != DASD_CQR_CLEAR_PENDING));
1482 /*
1483 * Now set each request back to TERMINATED, DONE or NEED_ERP
1484 * and call the callback function of flushed requests
1485 */
1486 __dasd_device_process_final_queue(device, &flush_queue);
8f61701b 1487 return rc;
1da177e4
LT		 1488}
1489
1490/*
1491 * Acquire the device lock and process queues for the device.
1492 */
8e09f215 1493static void dasd_device_tasklet(struct dasd_device *device)
1da177e4
LT		 1494{
1495 struct list_head final_queue;
1da177e4
LT		 1496
1497 atomic_set (&device->tasklet_scheduled, 0);
1498 INIT_LIST_HEAD(&final_queue);
1499 spin_lock_irq(get_ccwdev_lock(device->cdev));
1500 /* Check expire time of first request on the ccw queue. */
8e09f215
SW		 1501 __dasd_device_check_expire(device);
1502 /* find final requests on ccw queue */
1503 __dasd_device_process_ccw_queue(device, &final_queue);
a4d26c6a 1504 __dasd_device_check_path_events(device);
1da177e4
LT		 1505 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1506 /* Now call the callback function of requests with final status */
8e09f215
SW		 1507 __dasd_device_process_final_queue(device, &final_queue);
1508 spin_lock_irq(get_ccwdev_lock(device->cdev));
1da177e4 1509 /* Now check if the head of the ccw queue needs to be started. */
8e09f215
SW		 1510 __dasd_device_start_head(device);
1511 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1da177e4
LT		 1512 dasd_put_device(device);
1513}
1514
1515/*
1516 * Schedules a call to dasd_tasklet over the device tasklet.
1517 */
8e09f215 1518void dasd_schedule_device_bh(struct dasd_device *device)
1da177e4
LT		 1519{
1520 /* Protect against rescheduling. */
973bd993 1521 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
1da177e4
LT		 1522 return;
1523 dasd_get_device(device);
1524 tasklet_hi_schedule(&device->tasklet);
1525}
1526
eb6e199b
SW		 1527void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
1528{
1529 device->stopped |= bits;
1530}
1531EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
1532
1533void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
1534{
1535 device->stopped &= ~bits;
1536 if (!device->stopped)
1537 wake_up(&generic_waitq);
1538}
1539EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
1540
1da177e4 1541/*
8e09f215
SW		 1542 * Queue a request to the head of the device ccw_queue.
1543 * Start the I/O if possible.
1da177e4 1544 */
8e09f215 1545void dasd_add_request_head(struct dasd_ccw_req *cqr)
1da177e4
LT		 1546{
1547 struct dasd_device *device;
1548 unsigned long flags;
1549
8e09f215 1550 device = cqr->startdev;
1da177e4 1551 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
8e09f215
SW		 1552 cqr->status = DASD_CQR_QUEUED;
1553 list_add(&cqr->devlist, &device->ccw_queue);
1da177e4 1554 /* let the bh start the request to keep them in order */
8e09f215 1555 dasd_schedule_device_bh(device);
1da177e4
LT		 1556 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1557}
1558
1559/*
8e09f215
SW		 1560 * Queue a request to the tail of the device ccw_queue.
1561 * Start the I/O if possible.
1da177e4 1562 */
8e09f215 1563void dasd_add_request_tail(struct dasd_ccw_req *cqr)
1da177e4
LT		 1564{
1565 struct dasd_device *device;
1566 unsigned long flags;
1567
8e09f215 1568 device = cqr->startdev;
1da177e4 1569 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
8e09f215
SW		 1570 cqr->status = DASD_CQR_QUEUED;
1571 list_add_tail(&cqr->devlist, &device->ccw_queue);
1da177e4 1572 /* let the bh start the request to keep them in order */
8e09f215 1573 dasd_schedule_device_bh(device);
1da177e4
LT		 1574 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1575}
1576
1577/*
8e09f215 1578 * Wakeup helper for the 'sleep_on' functions.
1da177e4 1579 */
8e09f215 1580static void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
1da177e4 1581{
1c1e093c
SW		 1582 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
1583 cqr->callback_data = DASD_SLEEPON_END_TAG;
1584 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
1585 wake_up(&generic_waitq);
1da177e4
LT		 1586}
1587
8e09f215 1588static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
1da177e4
LT		 1589{
1590 struct dasd_device *device;
1591 int rc;
1592
8e09f215 1593 device = cqr->startdev;
1da177e4 1594 spin_lock_irq(get_ccwdev_lock(device->cdev));
1c1e093c 1595 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
1da177e4
LT		 1596 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1597 return rc;
1598}
1599
1600/*
eb6e199b 1601 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
1da177e4 1602 */
eb6e199b 1603static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
1da177e4 1604{
1da177e4 1605 struct dasd_device *device;
eb6e199b 1606 dasd_erp_fn_t erp_fn;
138c014d 1607
eb6e199b
SW		 1608 if (cqr->status == DASD_CQR_FILLED)
1609 return 0;
8e09f215 1610 device = cqr->startdev;
eb6e199b
SW		 1611 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
1612 if (cqr->status == DASD_CQR_TERMINATED) {
1613 device->discipline->handle_terminated_request(cqr);
1614 return 1;
1615 }
1616 if (cqr->status == DASD_CQR_NEED_ERP) {
1617 erp_fn = device->discipline->erp_action(cqr);
1618 erp_fn(cqr);
1619 return 1;
1620 }
1621 if (cqr->status == DASD_CQR_FAILED)
1622 dasd_log_sense(cqr, &cqr->irb);
1623 if (cqr->refers) {
1624 __dasd_process_erp(device, cqr);
1625 return 1;
1626 }
1627 }
1628 return 0;
1629}
138c014d 1630
eb6e199b
SW		 1631static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
1632{
1633 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
1634 if (cqr->refers) /* erp is not done yet */
1635 return 1;
1636 return ((cqr->status != DASD_CQR_DONE) &&
1637 (cqr->status != DASD_CQR_FAILED));
1638 } else
1639 return (cqr->status == DASD_CQR_FILLED);
1640}
138c014d 1641
eb6e199b
SW		 1642static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
1643{
1644 struct dasd_device *device;
1645 int rc;
1646 struct list_head ccw_queue;
1647 struct dasd_ccw_req *cqr;
1648
1649 INIT_LIST_HEAD(&ccw_queue);
1650 maincqr->status = DASD_CQR_FILLED;
1651 device = maincqr->startdev;
1652 list_add(&maincqr->blocklist, &ccw_queue);
1653 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
1654 cqr = list_first_entry(&ccw_queue,
1655 struct dasd_ccw_req, blocklist)) {
1656
1657 if (__dasd_sleep_on_erp(cqr))
1658 continue;
1659 if (cqr->status != DASD_CQR_FILLED) /* could be failed */
1660 continue;
5a27e60d
SW		 1661 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
1662 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1663 cqr->status = DASD_CQR_FAILED;
1664 cqr->intrc = -EPERM;
1665 continue;
1666 }
eb6e199b
SW		 1667 /* Non-temporary stop condition will trigger fail fast */
1668 if (device->stopped & ~DASD_STOPPED_PENDING &&
1669 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
1670 (!dasd_eer_enabled(device))) {
1671 cqr->status = DASD_CQR_FAILED;
1672 continue;
1673 }
eb6e199b
SW		 1674 /* Don't try to start requests if device is stopped */
1675 if (interruptible) {
1676 rc = wait_event_interruptible(
1677 generic_waitq, !(device->stopped));
1678 if (rc == -ERESTARTSYS) {
1679 cqr->status = DASD_CQR_FAILED;
1680 maincqr->intrc = rc;
1681 continue;
1682 }
1683 } else
1684 wait_event(generic_waitq, !(device->stopped));
1685
1686 cqr->callback = dasd_wakeup_cb;
1c1e093c 1687 cqr->callback_data = DASD_SLEEPON_START_TAG;
eb6e199b
SW		 1688 dasd_add_request_tail(cqr);
1689 if (interruptible) {
1690 rc = wait_event_interruptible(
1691 generic_waitq, _wait_for_wakeup(cqr));
1692 if (rc == -ERESTARTSYS) {
1693 dasd_cancel_req(cqr);
1694 /* wait (non-interruptible) for final status */
1695 wait_event(generic_waitq,
1696 _wait_for_wakeup(cqr));
1697 cqr->status = DASD_CQR_FAILED;
1698 maincqr->intrc = rc;
1699 continue;
1700 }
1701 } else
1702 wait_event(generic_waitq, _wait_for_wakeup(cqr));
1703 }
1704
1705 maincqr->endclk = get_clock();
1706 if ((maincqr->status != DASD_CQR_DONE) &&
1707 (maincqr->intrc != -ERESTARTSYS))
1708 dasd_log_sense(maincqr, &maincqr->irb);
1709 if (maincqr->status == DASD_CQR_DONE)
6cc7f168 1710 rc = 0;
eb6e199b
SW		 1711 else if (maincqr->intrc)
1712 rc = maincqr->intrc;
6cc7f168
SW		 1713 else
1714 rc = -EIO;
1da177e4
LT		 1715 return rc;
1716}
1717
eb6e199b
SW		 1718/*
1719 * Queue a request to the tail of the device ccw_queue and wait for
1720 * it's completion.
1721 */
1722int dasd_sleep_on(struct dasd_ccw_req *cqr)
1723{
1724 return _dasd_sleep_on(cqr, 0);
1725}
1726
1da177e4 1727/*
8e09f215
SW		 1728 * Queue a request to the tail of the device ccw_queue and wait
1729 * interruptible for it's completion.
1da177e4 1730 */
8e09f215 1731int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
1da177e4 1732{
eb6e199b 1733 return _dasd_sleep_on(cqr, 1);
1da177e4
LT		 1734}
1735
1736/*
1737 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
1738 * for eckd devices) the currently running request has to be terminated
1739 * and be put back to status queued, before the special request is added
1740 * to the head of the queue. Then the special request is waited on normally.
1741 */
8e09f215 1742static inline int _dasd_term_running_cqr(struct dasd_device *device)
1da177e4
LT		 1743{
1744 struct dasd_ccw_req *cqr;
1da177e4
LT		 1745
1746 if (list_empty(&device->ccw_queue))
1747 return 0;
8e09f215 1748 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
8f61701b 1749 return device->discipline->term_IO(cqr);
1da177e4
LT		 1750}
1751
8e09f215 1752int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
1da177e4 1753{
1da177e4
LT		 1754 struct dasd_device *device;
1755 int rc;
138c014d 1756
8e09f215 1757 device = cqr->startdev;
5a27e60d
SW		 1758 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
1759 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1760 cqr->status = DASD_CQR_FAILED;
1761 cqr->intrc = -EPERM;
1762 return -EIO;
1763 }
1da177e4
LT		 1764 spin_lock_irq(get_ccwdev_lock(device->cdev));
1765 rc = _dasd_term_running_cqr(device);
1766 if (rc) {
1767 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1768 return rc;
1769 }
1da177e4 1770 cqr->callback = dasd_wakeup_cb;
1c1e093c 1771 cqr->callback_data = DASD_SLEEPON_START_TAG;
1da177e4 1772 cqr->status = DASD_CQR_QUEUED;
8e09f215 1773 list_add(&cqr->devlist, &device->ccw_queue);
138c014d 1774
1da177e4 1775 /* let the bh start the request to keep them in order */
8e09f215 1776 dasd_schedule_device_bh(device);
138c014d 1777
1da177e4
LT		 1778 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1779
c80ee724 1780 wait_event(generic_waitq, _wait_for_wakeup(cqr));
138c014d 1781
6cc7f168
SW		 1782 if (cqr->status == DASD_CQR_DONE)
1783 rc = 0;
1784 else if (cqr->intrc)
1785 rc = cqr->intrc;
1786 else
1787 rc = -EIO;
1da177e4
LT		 1788 return rc;
1789}
1790
1791/*
1792 * Cancels a request that was started with dasd_sleep_on_req.
1793 * This is useful to timeout requests. The request will be
1794 * terminated if it is currently in i/o.
1795 * Returns 1 if the request has been terminated.
8e09f215
SW		 1796 * 0 if there was no need to terminate the request (not started yet)
1797 * negative error code if termination failed
1798 * Cancellation of a request is an asynchronous operation! The calling
1799 * function has to wait until the request is properly returned via callback.
1da177e4 1800 */
8e09f215 1801int dasd_cancel_req(struct dasd_ccw_req *cqr)
1da177e4 1802{
8e09f215 1803 struct dasd_device *device = cqr->startdev;
1da177e4
LT		 1804 unsigned long flags;
1805 int rc;
1806
1807 rc = 0;
1808 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1809 switch (cqr->status) {
1810 case DASD_CQR_QUEUED:
8e09f215
SW		 1811 /* request was not started - just set to cleared */
1812 cqr->status = DASD_CQR_CLEARED;
1da177e4
LT		 1813 break;
1814 case DASD_CQR_IN_IO:
1815 /* request in IO - terminate IO and release again */
8e09f215
SW		 1816 rc = device->discipline->term_IO(cqr);
1817 if (rc) {
fc19f381
SH		 1818 dev_err(&device->cdev->dev,
1819 "Cancelling request %p failed with rc=%d\n",
1820 cqr, rc);
8e09f215
SW		 1821 } else {
1822 cqr->stopclk = get_clock();
8e09f215 1823 }
1da177e4 1824 break;
8e09f215 1825 default: /* already finished or clear pending - do nothing */
1da177e4 1826 break;
8e09f215
SW		 1827 }
1828 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1829 dasd_schedule_device_bh(device);
1830 return rc;
1831}
1832
1833
1834/*
1835 * SECTION: Operations of the dasd_block layer.
1836 */
1837
1838/*
1839 * Timeout function for dasd_block. This is used when the block layer
1840 * is waiting for something that may not come reliably, (e.g. a state
1841 * change interrupt)
1842 */
1843static void dasd_block_timeout(unsigned long ptr)
1844{
1845 unsigned long flags;
1846 struct dasd_block *block;
1847
1848 block = (struct dasd_block *) ptr;
1849 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
1850 /* re-activate request queue */
eb6e199b 1851 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
8e09f215
SW		 1852 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
1853 dasd_schedule_block_bh(block);
1854}
1855
1856/*
1857 * Setup timeout for a dasd_block in jiffies.
1858 */
1859void dasd_block_set_timer(struct dasd_block *block, int expires)
1860{
48cae885
SW		 1861 if (expires == 0)
1862 del_timer(&block->timer);
1863 else
1864 mod_timer(&block->timer, jiffies + expires);
8e09f215
SW		 1865}
1866
1867/*
1868 * Clear timeout for a dasd_block.
1869 */
1870void dasd_block_clear_timer(struct dasd_block *block)
1871{
48cae885 1872 del_timer(&block->timer);
8e09f215
SW		 1873}
1874
8e09f215
SW		 1875/*
1876 * Process finished error recovery ccw.
1877 */
eb6e199b
SW		 1878static void __dasd_process_erp(struct dasd_device *device,
1879 struct dasd_ccw_req *cqr)
8e09f215
SW		 1880{
1881 dasd_erp_fn_t erp_fn;
8e09f215
SW		 1882
1883 if (cqr->status == DASD_CQR_DONE)
1884 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
1885 else
fc19f381 1886 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
8e09f215
SW		 1887 erp_fn = device->discipline->erp_postaction(cqr);
1888 erp_fn(cqr);
1889}
1da177e4 1890
8e09f215
SW		 1891/*
1892 * Fetch requests from the block device queue.
1893 */
1894static void __dasd_process_request_queue(struct dasd_block *block)
1895{
1896 struct request_queue *queue;
1897 struct request *req;
1898 struct dasd_ccw_req *cqr;
1899 struct dasd_device *basedev;
1900 unsigned long flags;
1901 queue = block->request_queue;
1902 basedev = block->base;
1903 /* No queue ? Then there is nothing to do. */
1904 if (queue == NULL)
1905 return;
1906
1907 /*
1908 * We requeue request from the block device queue to the ccw
1909 * queue only in two states. In state DASD_STATE_READY the
1910 * partition detection is done and we need to requeue requests
1911 * for that. State DASD_STATE_ONLINE is normal block device
1912 * operation.
1913 */
97f604b0
SW		 1914 if (basedev->state < DASD_STATE_READY) {
1915 while ((req = blk_fetch_request(block->request_queue)))
1916 __blk_end_request_all(req, -EIO);
8e09f215 1917 return;
97f604b0 1918 }
8e09f215 1919 /* Now we try to fetch requests from the request queue */
9934c8c0 1920 while (!blk_queue_plugged(queue) && (req = blk_peek_request(queue))) {
8e09f215
SW		 1921 if (basedev->features & DASD_FEATURE_READONLY &&
1922 rq_data_dir(req) == WRITE) {
1923 DBF_DEV_EVENT(DBF_ERR, basedev,
1924 "Rejecting write request %p",
1925 req);
9934c8c0 1926 blk_start_request(req);
40cbbb78 1927 __blk_end_request_all(req, -EIO);
8e09f215
SW		 1928 continue;
1929 }
1930 cqr = basedev->discipline->build_cp(basedev, block, req);
1931 if (IS_ERR(cqr)) {
1932 if (PTR_ERR(cqr) == -EBUSY)
1933 break; /* normal end condition */
1934 if (PTR_ERR(cqr) == -ENOMEM)
1935 break; /* terminate request queue loop */
1936 if (PTR_ERR(cqr) == -EAGAIN) {
1937 /*
1938 * The current request cannot be build right
1939 * now, we have to try later. If this request
1940 * is the head-of-queue we stop the device
1941 * for 1/2 second.
1942 */
1943 if (!list_empty(&block->ccw_queue))
1944 break;
eb6e199b
SW		 1945 spin_lock_irqsave(
1946 get_ccwdev_lock(basedev->cdev), flags);
1947 dasd_device_set_stop_bits(basedev,
1948 DASD_STOPPED_PENDING);
1949 spin_unlock_irqrestore(
1950 get_ccwdev_lock(basedev->cdev), flags);
8e09f215
SW		 1951 dasd_block_set_timer(block, HZ/2);
1952 break;
1953 }
1954 DBF_DEV_EVENT(DBF_ERR, basedev,
1955 "CCW creation failed (rc=%ld) "
1956 "on request %p",
1957 PTR_ERR(cqr), req);
9934c8c0 1958 blk_start_request(req);
40cbbb78 1959 __blk_end_request_all(req, -EIO);
8e09f215
SW		 1960 continue;
1961 }
1962 /*
1963 * Note: callback is set to dasd_return_cqr_cb in
1964 * __dasd_block_start_head to cover erp requests as well
1965 */
1966 cqr->callback_data = (void *) req;
1967 cqr->status = DASD_CQR_FILLED;
9934c8c0 1968 blk_start_request(req);
8e09f215
SW		 1969 list_add_tail(&cqr->blocklist, &block->ccw_queue);
1970 dasd_profile_start(block, cqr, req);
1971 }
1972}
1973
1974static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
1975{
1976 struct request *req;
1977 int status;
4c4e2148 1978 int error = 0;
8e09f215
SW		 1979
1980 req = (struct request *) cqr->callback_data;
1981 dasd_profile_end(cqr->block, cqr, req);
fe6b8e76 1982 status = cqr->block->base->discipline->free_cp(cqr, req);
4c4e2148
KU		 1983 if (status <= 0)
1984 error = status ? status : -EIO;
40cbbb78 1985 __blk_end_request_all(req, error);
8e09f215
SW		 1986}
1987
1988/*
1989 * Process ccw request queue.
1990 */
1991static void __dasd_process_block_ccw_queue(struct dasd_block *block,
1992 struct list_head *final_queue)
1993{
1994 struct list_head *l, *n;
1995 struct dasd_ccw_req *cqr;
1996 dasd_erp_fn_t erp_fn;
1997 unsigned long flags;
1998 struct dasd_device *base = block->base;
1999
2000restart:
2001 /* Process request with final status. */
2002 list_for_each_safe(l, n, &block->ccw_queue) {
2003 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2004 if (cqr->status != DASD_CQR_DONE &&
2005 cqr->status != DASD_CQR_FAILED &&
2006 cqr->status != DASD_CQR_NEED_ERP &&
2007 cqr->status != DASD_CQR_TERMINATED)
2008 continue;
2009
2010 if (cqr->status == DASD_CQR_TERMINATED) {
2011 base->discipline->handle_terminated_request(cqr);
2012 goto restart;
2013 }
2014
2015 /* Process requests that may be recovered */
2016 if (cqr->status == DASD_CQR_NEED_ERP) {
6c5f57c7 2017 erp_fn = base->discipline->erp_action(cqr);
6a5176c4
SH		 2018 if (IS_ERR(erp_fn(cqr)))
2019 continue;
8e09f215
SW		 2020 goto restart;
2021 }
2022
a9cffb22
SH		 2023 /* log sense for fatal error */
2024 if (cqr->status == DASD_CQR_FAILED) {
2025 dasd_log_sense(cqr, &cqr->irb);
2026 }
2027
8e09f215
SW		 2028 /* First of all call extended error reporting. */
2029 if (dasd_eer_enabled(base) &&
2030 cqr->status == DASD_CQR_FAILED) {
2031 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
2032
2033 /* restart request */
2034 cqr->status = DASD_CQR_FILLED;
2035 cqr->retries = 255;
2036 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
eb6e199b 2037 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
8e09f215
SW		 2038 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
2039 flags);
2040 goto restart;
2041 }
2042
2043 /* Process finished ERP request. */
2044 if (cqr->refers) {
eb6e199b 2045 __dasd_process_erp(base, cqr);
8e09f215
SW		 2046 goto restart;
2047 }
2048
2049 /* Rechain finished requests to final queue */
2050 cqr->endclk = get_clock();
2051 list_move_tail(&cqr->blocklist, final_queue);
2052 }
2053}
2054
2055static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
2056{
2057 dasd_schedule_block_bh(cqr->block);
2058}
2059
2060static void __dasd_block_start_head(struct dasd_block *block)
2061{
2062 struct dasd_ccw_req *cqr;
2063
2064 if (list_empty(&block->ccw_queue))
2065 return;
2066 /* We allways begin with the first requests on the queue, as some
2067 * of previously started requests have to be enqueued on a
2068 * dasd_device again for error recovery.
2069 */
2070 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
2071 if (cqr->status != DASD_CQR_FILLED)
2072 continue;
5a27e60d
SW		 2073 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
2074 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2075 cqr->status = DASD_CQR_FAILED;
2076 cqr->intrc = -EPERM;
2077 dasd_schedule_block_bh(block);
2078 continue;
2079 }
8e09f215
SW		 2080 /* Non-temporary stop condition will trigger fail fast */
2081 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
2082 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2083 (!dasd_eer_enabled(block->base))) {
2084 cqr->status = DASD_CQR_FAILED;
2085 dasd_schedule_block_bh(block);
2086 continue;
2087 }
2088 /* Don't try to start requests if device is stopped */
2089 if (block->base->stopped)
2090 return;
2091
2092 /* just a fail safe check, should not happen */
2093 if (!cqr->startdev)
2094 cqr->startdev = block->base;
2095
2096 /* make sure that the requests we submit find their way back */
2097 cqr->callback = dasd_return_cqr_cb;
2098
2099 dasd_add_request_tail(cqr);
2100 }
2101}
2102
2103/*
2104 * Central dasd_block layer routine. Takes requests from the generic
2105 * block layer request queue, creates ccw requests, enqueues them on
2106 * a dasd_device and processes ccw requests that have been returned.
2107 */
2108static void dasd_block_tasklet(struct dasd_block *block)
2109{
2110 struct list_head final_queue;
2111 struct list_head *l, *n;
2112 struct dasd_ccw_req *cqr;
2113
2114 atomic_set(&block->tasklet_scheduled, 0);
2115 INIT_LIST_HEAD(&final_queue);
2116 spin_lock(&block->queue_lock);
2117 /* Finish off requests on ccw queue */
2118 __dasd_process_block_ccw_queue(block, &final_queue);
2119 spin_unlock(&block->queue_lock);
2120 /* Now call the callback function of requests with final status */
2121 spin_lock_irq(&block->request_queue_lock);
2122 list_for_each_safe(l, n, &final_queue) {
2123 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2124 list_del_init(&cqr->blocklist);
2125 __dasd_cleanup_cqr(cqr);
2126 }
2127 spin_lock(&block->queue_lock);
2128 /* Get new request from the block device request queue */
2129 __dasd_process_request_queue(block);
2130 /* Now check if the head of the ccw queue needs to be started. */
2131 __dasd_block_start_head(block);
2132 spin_unlock(&block->queue_lock);
2133 spin_unlock_irq(&block->request_queue_lock);
2134 dasd_put_device(block->base);
2135}
2136
2137static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2138{
2139 wake_up(&dasd_flush_wq);
2140}
2141
2142/*
2143 * Go through all request on the dasd_block request queue, cancel them
2144 * on the respective dasd_device, and return them to the generic
2145 * block layer.
2146 */
2147static int dasd_flush_block_queue(struct dasd_block *block)
2148{
2149 struct dasd_ccw_req *cqr, *n;
2150 int rc, i;
2151 struct list_head flush_queue;
2152
2153 INIT_LIST_HEAD(&flush_queue);
2154 spin_lock_bh(&block->queue_lock);
2155 rc = 0;
2156restart:
2157 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2158 /* if this request currently owned by a dasd_device cancel it */
2159 if (cqr->status >= DASD_CQR_QUEUED)
2160 rc = dasd_cancel_req(cqr);
2161 if (rc < 0)
2162 break;
2163 /* Rechain request (including erp chain) so it won't be
2164 * touched by the dasd_block_tasklet anymore.
2165 * Replace the callback so we notice when the request
2166 * is returned from the dasd_device layer.
2167 */
2168 cqr->callback = _dasd_wake_block_flush_cb;
2169 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2170 list_move_tail(&cqr->blocklist, &flush_queue);
2171 if (i > 1)
2172 /* moved more than one request - need to restart */
2173 goto restart;
2174 }
2175 spin_unlock_bh(&block->queue_lock);
2176 /* Now call the callback function of flushed requests */
2177restart_cb:
2178 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
2179 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
2180 /* Process finished ERP request. */
2181 if (cqr->refers) {
0cd4bd47 2182 spin_lock_bh(&block->queue_lock);
eb6e199b 2183 __dasd_process_erp(block->base, cqr);
0cd4bd47 2184 spin_unlock_bh(&block->queue_lock);
8e09f215
SW		 2185 /* restart list_for_xx loop since dasd_process_erp
2186 * might remove multiple elements */
2187 goto restart_cb;
2188 }
2189 /* call the callback function */
0cd4bd47 2190 spin_lock_irq(&block->request_queue_lock);
8e09f215
SW		 2191 cqr->endclk = get_clock();
2192 list_del_init(&cqr->blocklist);
2193 __dasd_cleanup_cqr(cqr);
0cd4bd47 2194 spin_unlock_irq(&block->request_queue_lock);
1da177e4 2195 }
1da177e4
LT		 2196 return rc;
2197}
2198
2199/*
8e09f215
SW		 2200 * Schedules a call to dasd_tasklet over the device tasklet.
2201 */
2202void dasd_schedule_block_bh(struct dasd_block *block)
2203{
2204 /* Protect against rescheduling. */
2205 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
2206 return;
2207 /* life cycle of block is bound to it's base device */
2208 dasd_get_device(block->base);
2209 tasklet_hi_schedule(&block->tasklet);
2210}
2211
2212
2213/*
2214 * SECTION: external block device operations
2215 * (request queue handling, open, release, etc.)
1da177e4
LT		 2216 */
2217
2218/*
2219 * Dasd request queue function. Called from ll_rw_blk.c
2220 */
8e09f215 2221static void do_dasd_request(struct request_queue *queue)
1da177e4 2222{
8e09f215 2223 struct dasd_block *block;
1da177e4 2224
8e09f215
SW		 2225 block = queue->queuedata;
2226 spin_lock(&block->queue_lock);
1da177e4 2227 /* Get new request from the block device request queue */
8e09f215 2228 __dasd_process_request_queue(block);
1da177e4 2229 /* Now check if the head of the ccw queue needs to be started. */
8e09f215
SW		 2230 __dasd_block_start_head(block);
2231 spin_unlock(&block->queue_lock);
1da177e4
LT		 2232}
2233
2234/*
2235 * Allocate and initialize request queue and default I/O scheduler.
2236 */
8e09f215 2237static int dasd_alloc_queue(struct dasd_block *block)
1da177e4
LT		 2238{
2239 int rc;
2240
8e09f215
SW		 2241 block->request_queue = blk_init_queue(do_dasd_request,
2242 &block->request_queue_lock);
2243 if (block->request_queue == NULL)
1da177e4
LT		 2244 return -ENOMEM;
2245
8e09f215 2246 block->request_queue->queuedata = block;
1da177e4 2247
8e09f215 2248 elevator_exit(block->request_queue->elevator);
08a8a0c5 2249 block->request_queue->elevator = NULL;
8e09f215 2250 rc = elevator_init(block->request_queue, "deadline");
1da177e4 2251 if (rc) {
8e09f215 2252 blk_cleanup_queue(block->request_queue);
1da177e4
LT		 2253 return rc;
2254 }
2255 return 0;
2256}
2257
2258/*
2259 * Allocate and initialize request queue.
2260 */
8e09f215 2261static void dasd_setup_queue(struct dasd_block *block)
1da177e4
LT		 2262{
2263 int max;
2264
e4dbb0f2
SH		 2265 if (block->base->features & DASD_FEATURE_USERAW) {
2266 /*
2267 * the max_blocks value for raw_track access is 256
2268 * it is higher than the native ECKD value because we
2269 * only need one ccw per track
2270 * so the max_hw_sectors are
2271 * 2048 x 512B = 1024kB = 16 tracks
2272 */
2273 max = 2048;
2274 } else {
2275 max = block->base->discipline->max_blocks << block->s2b_shift;
2276 }
2277 blk_queue_logical_block_size(block->request_queue,
2278 block->bp_block);
086fa5ff 2279 blk_queue_max_hw_sectors(block->request_queue, max);
8a78362c 2280 blk_queue_max_segments(block->request_queue, -1L);
f3eb5384
SW		 2281 /* with page sized segments we can translate each segement into
2282 * one idaw/tidaw
2283 */
2284 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
2285 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
1da177e4
LT		 2286}
2287
2288/*
2289 * Deactivate and free request queue.
2290 */
8e09f215 2291static void dasd_free_queue(struct dasd_block *block)
1da177e4 2292{
8e09f215
SW		 2293 if (block->request_queue) {
2294 blk_cleanup_queue(block->request_queue);
2295 block->request_queue = NULL;
1da177e4
LT		 2296 }
2297}
2298
2299/*
2300 * Flush request on the request queue.
2301 */
8e09f215 2302static void dasd_flush_request_queue(struct dasd_block *block)
1da177e4
LT		 2303{
2304 struct request *req;
2305
8e09f215 2306 if (!block->request_queue)
1da177e4 2307 return;
138c014d 2308
8e09f215 2309 spin_lock_irq(&block->request_queue_lock);
9934c8c0 2310 while ((req = blk_fetch_request(block->request_queue)))
40cbbb78 2311 __blk_end_request_all(req, -EIO);
8e09f215 2312 spin_unlock_irq(&block->request_queue_lock);
1da177e4
LT		 2313}
2314
57a7c0bc 2315static int dasd_open(struct block_device *bdev, fmode_t mode)
1da177e4 2316{
57a7c0bc 2317 struct dasd_block *block = bdev->bd_disk->private_data;
9eb25122 2318 struct dasd_device *base;
1da177e4
LT		 2319 int rc;
2320
9eb25122
SH		 2321 if (!block)
2322 return -ENODEV;
2323
2324 base = block->base;
8e09f215
SW		 2325 atomic_inc(&block->open_count);
2326 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
1da177e4
LT		 2327 rc = -ENODEV;
2328 goto unlock;
2329 }
2330
8e09f215 2331 if (!try_module_get(base->discipline->owner)) {
1da177e4
LT		 2332 rc = -EINVAL;
2333 goto unlock;
2334 }
2335
2336 if (dasd_probeonly) {
fc19f381
SH		 2337 dev_info(&base->cdev->dev,
2338 "Accessing the DASD failed because it is in "
2339 "probeonly mode\n");
1da177e4
LT		 2340 rc = -EPERM;
2341 goto out;
2342 }
2343
8e09f215
SW		 2344 if (base->state <= DASD_STATE_BASIC) {
2345 DBF_DEV_EVENT(DBF_ERR, base, " %s",
1da177e4
LT		 2346 " Cannot open unrecognized device");
2347 rc = -ENODEV;
2348 goto out;
2349 }
2350
33b62a30
SW		 2351 if ((mode & FMODE_WRITE) &&
2352 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
2353 (base->features & DASD_FEATURE_READONLY))) {
2354 rc = -EROFS;
2355 goto out;
2356 }
2357
1da177e4
LT		 2358 return 0;
2359
2360out:
8e09f215 2361 module_put(base->discipline->owner);
1da177e4 2362unlock:
8e09f215 2363 atomic_dec(&block->open_count);
1da177e4
LT		 2364 return rc;
2365}
2366
57a7c0bc 2367static int dasd_release(struct gendisk *disk, fmode_t mode)
1da177e4 2368{
8e09f215 2369 struct dasd_block *block = disk->private_data;
1da177e4 2370
8e09f215
SW		 2371 atomic_dec(&block->open_count);
2372 module_put(block->base->discipline->owner);
1da177e4
LT		 2373 return 0;
2374}
2375
a885c8c4
CH		 2376/*
2377 * Return disk geometry.
2378 */
8e09f215 2379static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
a885c8c4 2380{
8e09f215
SW		 2381 struct dasd_block *block;
2382 struct dasd_device *base;
a885c8c4 2383
8e09f215 2384 block = bdev->bd_disk->private_data;
8e09f215 2385 if (!block)
a885c8c4 2386 return -ENODEV;
cf05b824 2387 base = block->base;
a885c8c4 2388
8e09f215
SW		 2389 if (!base->discipline ||
2390 !base->discipline->fill_geometry)
a885c8c4
CH		 2391 return -EINVAL;
2392
8e09f215
SW		 2393 base->discipline->fill_geometry(block, geo);
2394 geo->start = get_start_sect(bdev) >> block->s2b_shift;
a885c8c4
CH		 2395 return 0;
2396}
2397
83d5cde4 2398const struct block_device_operations
1da177e4
LT		 2399dasd_device_operations = {
2400 .owner = THIS_MODULE,
57a7c0bc
AV		 2401 .open = dasd_open,
2402 .release = dasd_release,
0000d031
HC		 2403 .ioctl = dasd_ioctl,
2404 .compat_ioctl = dasd_ioctl,
a885c8c4 2405 .getgeo = dasd_getgeo,
1da177e4
LT		 2406};
2407
8e09f215
SW		 2408/*******************************************************************************
2409 * end of block device operations
2410 */
1da177e4
LT		 2411
2412static void
2413dasd_exit(void)
2414{
2415#ifdef CONFIG_PROC_FS
2416 dasd_proc_exit();
2417#endif
20c64468 2418 dasd_eer_exit();
6bb0e010
HH		 2419 if (dasd_page_cache != NULL) {
2420 kmem_cache_destroy(dasd_page_cache);
2421 dasd_page_cache = NULL;
2422 }
1da177e4
LT		 2423 dasd_gendisk_exit();
2424 dasd_devmap_exit();
1da177e4
LT		 2425 if (dasd_debug_area != NULL) {
2426 debug_unregister(dasd_debug_area);
2427 dasd_debug_area = NULL;
2428 }
2429}
2430
2431/*
2432 * SECTION: common functions for ccw_driver use
2433 */
2434
33b62a30
SW		 2435/*
2436 * Is the device read-only?
2437 * Note that this function does not report the setting of the
2438 * readonly device attribute, but how it is configured in z/VM.
2439 */
2440int dasd_device_is_ro(struct dasd_device *device)
2441{
2442 struct ccw_dev_id dev_id;
2443 struct diag210 diag_data;
2444 int rc;
2445
2446 if (!MACHINE_IS_VM)
2447 return 0;
2448 ccw_device_get_id(device->cdev, &dev_id);
2449 memset(&diag_data, 0, sizeof(diag_data));
2450 diag_data.vrdcdvno = dev_id.devno;
2451 diag_data.vrdclen = sizeof(diag_data);
2452 rc = diag210(&diag_data);
2453 if (rc == 0 || rc == 2) {
2454 return diag_data.vrdcvfla & 0x80;
2455 } else {
2456 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
2457 dev_id.devno, rc);
2458 return 0;
2459 }
2460}
2461EXPORT_SYMBOL_GPL(dasd_device_is_ro);
2462
f3445a1a
CH		 2463static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
2464{
2465 struct ccw_device *cdev = data;
2466 int ret;
2467
2468 ret = ccw_device_set_online(cdev);
2469 if (ret)
2470 pr_warning("%s: Setting the DASD online failed with rc=%d\n",
2471 dev_name(&cdev->dev), ret);
f3445a1a
CH		 2472}
2473
1c01b8a5
HH		 2474/*
2475 * Initial attempt at a probe function. this can be simplified once
2476 * the other detection code is gone.
2477 */
8e09f215
SW		 2478int dasd_generic_probe(struct ccw_device *cdev,
2479 struct dasd_discipline *discipline)
1da177e4
LT		 2480{
2481 int ret;
2482
2483 ret = dasd_add_sysfs_files(cdev);
2484 if (ret) {
b8ed5dd5
SH		 2485 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
2486 "dasd_generic_probe: could not add "
2487 "sysfs entries");
40545573 2488 return ret;
1da177e4 2489 }
40545573 2490 cdev->handler = &dasd_int_handler;
1da177e4 2491
40545573
HH		 2492 /*
2493 * Automatically online either all dasd devices (dasd_autodetect)
2494 * or all devices specified with dasd= parameters during
2495 * initial probe.
2496 */
2497 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
2a0217d5 2498 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
f3445a1a 2499 async_schedule(dasd_generic_auto_online, cdev);
de3e0da1 2500 return 0;
1da177e4
LT		 2501}
2502
1c01b8a5
HH		 2503/*
2504 * This will one day be called from a global not_oper handler.
2505 * It is also used by driver_unregister during module unload.
2506 */
8e09f215 2507void dasd_generic_remove(struct ccw_device *cdev)
1da177e4
LT		 2508{
2509 struct dasd_device *device;
8e09f215 2510 struct dasd_block *block;
1da177e4 2511
59afda78
HH		 2512 cdev->handler = NULL;
2513
1da177e4
LT		 2514 dasd_remove_sysfs_files(cdev);
2515 device = dasd_device_from_cdev(cdev);
2516 if (IS_ERR(device))
2517 return;
2518 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
2519 /* Already doing offline processing */
2520 dasd_put_device(device);
2521 return;
2522 }
2523 /*
2524 * This device is removed unconditionally. Set offline
2525 * flag to prevent dasd_open from opening it while it is
2526 * no quite down yet.
2527 */
2528 dasd_set_target_state(device, DASD_STATE_NEW);
2529 /* dasd_delete_device destroys the device reference. */
8e09f215
SW		 2530 block = device->block;
2531 device->block = NULL;
1da177e4 2532 dasd_delete_device(device);
8e09f215
SW		 2533 /*
2534 * life cycle of block is bound to device, so delete it after
2535 * device was safely removed
2536 */
2537 if (block)
2538 dasd_free_block(block);
1da177e4
LT		 2539}
2540
1c01b8a5
HH		 2541/*
2542 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
1da177e4 2543 * the device is detected for the first time and is supposed to be used
1c01b8a5
HH		 2544 * or the user has started activation through sysfs.
2545 */
8e09f215
SW		 2546int dasd_generic_set_online(struct ccw_device *cdev,
2547 struct dasd_discipline *base_discipline)
1da177e4 2548{
aa88861f 2549 struct dasd_discipline *discipline;
1da177e4 2550 struct dasd_device *device;
c6eb7b77 2551 int rc;
f24acd45 2552
40545573
HH		 2553 /* first online clears initial online feature flag */
2554 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
1da177e4
LT		 2555 device = dasd_create_device(cdev);
2556 if (IS_ERR(device))
2557 return PTR_ERR(device);
2558
aa88861f 2559 discipline = base_discipline;
c6eb7b77 2560 if (device->features & DASD_FEATURE_USEDIAG) {
1da177e4 2561 if (!dasd_diag_discipline_pointer) {
fc19f381
SH		 2562 pr_warning("%s Setting the DASD online failed because "
2563 "of missing DIAG discipline\n",
2564 dev_name(&cdev->dev));
1da177e4
LT		 2565 dasd_delete_device(device);
2566 return -ENODEV;
2567 }
2568 discipline = dasd_diag_discipline_pointer;
2569 }
aa88861f
PO		 2570 if (!try_module_get(base_discipline->owner)) {
2571 dasd_delete_device(device);
2572 return -EINVAL;
2573 }
2574 if (!try_module_get(discipline->owner)) {
2575 module_put(base_discipline->owner);
2576 dasd_delete_device(device);
2577 return -EINVAL;
2578 }
2579 device->base_discipline = base_discipline;
1da177e4
LT		 2580 device->discipline = discipline;
2581
8e09f215 2582 /* check_device will allocate block device if necessary */
1da177e4
LT		 2583 rc = discipline->check_device(device);
2584 if (rc) {
fc19f381
SH		 2585 pr_warning("%s Setting the DASD online with discipline %s "
2586 "failed with rc=%i\n",
2587 dev_name(&cdev->dev), discipline->name, rc);
aa88861f
PO		 2588 module_put(discipline->owner);
2589 module_put(base_discipline->owner);
1da177e4
LT		 2590 dasd_delete_device(device);
2591 return rc;
2592 }
2593
2594 dasd_set_target_state(device, DASD_STATE_ONLINE);
2595 if (device->state <= DASD_STATE_KNOWN) {
fc19f381
SH		 2596 pr_warning("%s Setting the DASD online failed because of a "
2597 "missing discipline\n", dev_name(&cdev->dev));
1da177e4
LT		 2598 rc = -ENODEV;
2599 dasd_set_target_state(device, DASD_STATE_NEW);
8e09f215
SW		 2600 if (device->block)
2601 dasd_free_block(device->block);
1da177e4
LT		 2602 dasd_delete_device(device);
2603 } else
2604 pr_debug("dasd_generic device %s found\n",
2a0217d5 2605 dev_name(&cdev->dev));
589c74d5
SH		 2606
2607 wait_event(dasd_init_waitq, _wait_for_device(device));
2608
1da177e4 2609 dasd_put_device(device);
1da177e4
LT		 2610 return rc;
2611}
2612
8e09f215 2613int dasd_generic_set_offline(struct ccw_device *cdev)
1da177e4
LT		 2614{
2615 struct dasd_device *device;
8e09f215 2616 struct dasd_block *block;
dafd87aa 2617 int max_count, open_count;
1da177e4
LT		 2618
2619 device = dasd_device_from_cdev(cdev);
2620 if (IS_ERR(device))
2621 return PTR_ERR(device);
2622 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
2623 /* Already doing offline processing */
2624 dasd_put_device(device);
2625 return 0;
2626 }
2627 /*
2628 * We must make sure that this device is currently not in use.
2629 * The open_count is increased for every opener, that includes
2630 * the blkdev_get in dasd_scan_partitions. We are only interested
2631 * in the other openers.
2632 */
8e09f215 2633 if (device->block) {
a806170e
HC		 2634 max_count = device->block->bdev ? 0 : -1;
2635 open_count = atomic_read(&device->block->open_count);
8e09f215
SW		 2636 if (open_count > max_count) {
2637 if (open_count > 0)
fc19f381
SH		 2638 pr_warning("%s: The DASD cannot be set offline "
2639 "with open count %i\n",
2640 dev_name(&cdev->dev), open_count);
8e09f215 2641 else
fc19f381
SH		 2642 pr_warning("%s: The DASD cannot be set offline "
2643 "while it is in use\n",
2644 dev_name(&cdev->dev));
8e09f215
SW		 2645 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
2646 dasd_put_device(device);
2647 return -EBUSY;
2648 }
1da177e4
LT		 2649 }
2650 dasd_set_target_state(device, DASD_STATE_NEW);
2651 /* dasd_delete_device destroys the device reference. */
8e09f215
SW		 2652 block = device->block;
2653 device->block = NULL;
1da177e4 2654 dasd_delete_device(device);
8e09f215
SW		 2655 /*
2656 * life cycle of block is bound to device, so delete it after
2657 * device was safely removed
2658 */
2659 if (block)
2660 dasd_free_block(block);
1da177e4
LT		 2661 return 0;
2662}
2663
a4d26c6a
SW		 2664int dasd_generic_last_path_gone(struct dasd_device *device)
2665{
2666 struct dasd_ccw_req *cqr;
2667
2668 dev_warn(&device->cdev->dev, "No operational channel path is left "
2669 "for the device\n");
2670 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
2671 /* First of all call extended error reporting. */
2672 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
2673
2674 if (device->state < DASD_STATE_BASIC)
2675 return 0;
2676 /* Device is active. We want to keep it. */
2677 list_for_each_entry(cqr, &device->ccw_queue, devlist)
2678 if ((cqr->status == DASD_CQR_IN_IO) ||
2679 (cqr->status == DASD_CQR_CLEAR_PENDING)) {
2680 cqr->status = DASD_CQR_QUEUED;
2681 cqr->retries++;
2682 }
2683 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
2684 dasd_device_clear_timer(device);
2685 dasd_schedule_device_bh(device);
2686 return 1;
2687}
2688EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
2689
2690int dasd_generic_path_operational(struct dasd_device *device)
2691{
2692 dev_info(&device->cdev->dev, "A channel path to the device has become "
2693 "operational\n");
2694 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
2695 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
2696 if (device->stopped & DASD_UNRESUMED_PM) {
2697 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
2698 dasd_restore_device(device);
2699 return 1;
2700 }
2701 dasd_schedule_device_bh(device);
2702 if (device->block)
2703 dasd_schedule_block_bh(device->block);
2704 return 1;
2705}
2706EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
2707
8e09f215 2708int dasd_generic_notify(struct ccw_device *cdev, int event)
1da177e4
LT		 2709{
2710 struct dasd_device *device;
1da177e4
LT		 2711 int ret;
2712
91c36919 2713 device = dasd_device_from_cdev_locked(cdev);
1da177e4
LT		 2714 if (IS_ERR(device))
2715 return 0;
1da177e4
LT		 2716 ret = 0;
2717 switch (event) {
2718 case CIO_GONE:
47593bfa 2719 case CIO_BOXED:
1da177e4 2720 case CIO_NO_PATH:
a4d26c6a
SW		 2721 device->path_data.opm = 0;
2722 device->path_data.ppm = 0;
2723 device->path_data.npm = 0;
2724 ret = dasd_generic_last_path_gone(device);
1da177e4
LT		 2725 break;
2726 case CIO_OPER:
1da177e4 2727 ret = 1;
a4d26c6a
SW		 2728 if (device->path_data.opm)
2729 ret = dasd_generic_path_operational(device);
1da177e4
LT		 2730 break;
2731 }
1da177e4
LT		 2732 dasd_put_device(device);
2733 return ret;
2734}
2735
a4d26c6a
SW		 2736void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
2737{
2738 int chp;
2739 __u8 oldopm, eventlpm;
2740 struct dasd_device *device;
2741
2742 device = dasd_device_from_cdev_locked(cdev);
2743 if (IS_ERR(device))
2744 return;
2745 for (chp = 0; chp < 8; chp++) {
2746 eventlpm = 0x80 >> chp;
2747 if (path_event[chp] & PE_PATH_GONE) {
2748 oldopm = device->path_data.opm;
2749 device->path_data.opm &= ~eventlpm;
2750 device->path_data.ppm &= ~eventlpm;
2751 device->path_data.npm &= ~eventlpm;
2752 if (oldopm && !device->path_data.opm)
2753 dasd_generic_last_path_gone(device);
2754 }
2755 if (path_event[chp] & PE_PATH_AVAILABLE) {
2756 device->path_data.opm &= ~eventlpm;
2757 device->path_data.ppm &= ~eventlpm;
2758 device->path_data.npm &= ~eventlpm;
2759 device->path_data.tbvpm |= eventlpm;
2760 dasd_schedule_device_bh(device);
2761 }
2762 }
2763 dasd_put_device(device);
2764}
2765EXPORT_SYMBOL_GPL(dasd_generic_path_event);
2766
2767int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
2768{
2769 if (!device->path_data.opm && lpm) {
2770 device->path_data.opm = lpm;
2771 dasd_generic_path_operational(device);
2772 } else
2773 device->path_data.opm |= lpm;
2774 return 0;
2775}
2776EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
2777
2778
d41dd122
SH		 2779int dasd_generic_pm_freeze(struct ccw_device *cdev)
2780{
2781 struct dasd_ccw_req *cqr, *n;
2782 int rc;
2783 struct list_head freeze_queue;
2784 struct dasd_device *device = dasd_device_from_cdev(cdev);
2785
2786 if (IS_ERR(device))
2787 return PTR_ERR(device);
6f272b9c
SH		 2788
2789 if (device->discipline->freeze)
2790 rc = device->discipline->freeze(device);
2791
d41dd122 2792 /* disallow new I/O */
eb6e199b 2793 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
d41dd122
SH		 2794 /* clear active requests */
2795 INIT_LIST_HEAD(&freeze_queue);
2796 spin_lock_irq(get_ccwdev_lock(cdev));
2797 rc = 0;
2798 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
2799 /* Check status and move request to flush_queue */
2800 if (cqr->status == DASD_CQR_IN_IO) {
2801 rc = device->discipline->term_IO(cqr);
2802 if (rc) {
2803 /* unable to terminate requeust */
2804 dev_err(&device->cdev->dev,
2805 "Unable to terminate request %p "
2806 "on suspend\n", cqr);
2807 spin_unlock_irq(get_ccwdev_lock(cdev));
2808 dasd_put_device(device);
2809 return rc;
2810 }
2811 }
2812 list_move_tail(&cqr->devlist, &freeze_queue);
2813 }
2814
2815 spin_unlock_irq(get_ccwdev_lock(cdev));
2816
2817 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
2818 wait_event(dasd_flush_wq,
2819 (cqr->status != DASD_CQR_CLEAR_PENDING));
2820 if (cqr->status == DASD_CQR_CLEARED)
2821 cqr->status = DASD_CQR_QUEUED;
2822 }
2823 /* move freeze_queue to start of the ccw_queue */
2824 spin_lock_irq(get_ccwdev_lock(cdev));
2825 list_splice_tail(&freeze_queue, &device->ccw_queue);
2826 spin_unlock_irq(get_ccwdev_lock(cdev));
2827
d41dd122
SH		 2828 dasd_put_device(device);
2829 return rc;
2830}
2831EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
2832
2833int dasd_generic_restore_device(struct ccw_device *cdev)
2834{
2835 struct dasd_device *device = dasd_device_from_cdev(cdev);
2836 int rc = 0;
2837
2838 if (IS_ERR(device))
2839 return PTR_ERR(device);
2840
e6125fba 2841 /* allow new IO again */
eb6e199b
SW		 2842 dasd_device_remove_stop_bits(device,
2843 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
e6125fba 2844
d41dd122 2845 dasd_schedule_device_bh(device);
d41dd122 2846
eb6e199b
SW		 2847 /*
2848 * call discipline restore function
2849 * if device is stopped do nothing e.g. for disconnected devices
2850 */
2851 if (device->discipline->restore && !(device->stopped))
d41dd122 2852 rc = device->discipline->restore(device);
eb6e199b 2853 if (rc || device->stopped)
e6125fba
SH		 2854 /*
2855 * if the resume failed for the DASD we put it in
2856 * an UNRESUMED stop state
2857 */
2858 device->stopped |= DASD_UNRESUMED_PM;
d41dd122 2859
6fca97a9
SH		 2860 if (device->block)
2861 dasd_schedule_block_bh(device->block);
2862
d41dd122 2863 dasd_put_device(device);
e6125fba 2864 return 0;
d41dd122
SH		 2865}
2866EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
2867
763968e2
HC		 2868static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
2869 void *rdc_buffer,
2870 int rdc_buffer_size,
68b781fe 2871 int magic)
17283b56
CH		 2872{
2873 struct dasd_ccw_req *cqr;
2874 struct ccw1 *ccw;
d9fa9441 2875 unsigned long *idaw;
17283b56
CH		 2876
2877 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
2878
2879 if (IS_ERR(cqr)) {
fc19f381
SH		 2880 /* internal error 13 - Allocating the RDC request failed*/
2881 dev_err(&device->cdev->dev,
2882 "An error occurred in the DASD device driver, "
2883 "reason=%s\n", "13");
17283b56
CH		 2884 return cqr;
2885 }
2886
2887 ccw = cqr->cpaddr;
2888 ccw->cmd_code = CCW_CMD_RDC;
d9fa9441
SH		 2889 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
2890 idaw = (unsigned long *) (cqr->data);
2891 ccw->cda = (__u32)(addr_t) idaw;
2892 ccw->flags = CCW_FLAG_IDA;
2893 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
2894 } else {
2895 ccw->cda = (__u32)(addr_t) rdc_buffer;
2896 ccw->flags = 0;
2897 }
17283b56 2898
d9fa9441 2899 ccw->count = rdc_buffer_size;
8e09f215
SW		 2900 cqr->startdev = device;
2901 cqr->memdev = device;
17283b56 2902 cqr->expires = 10*HZ;
eb6e199b 2903 cqr->retries = 256;
17283b56
CH		 2904 cqr->buildclk = get_clock();
2905 cqr->status = DASD_CQR_FILLED;
2906 return cqr;
2907}
2908
2909
68b781fe 2910int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
92636b15 2911 void *rdc_buffer, int rdc_buffer_size)
17283b56
CH		 2912{
2913 int ret;
2914 struct dasd_ccw_req *cqr;
2915
92636b15 2916 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
17283b56
CH		 2917 magic);
2918 if (IS_ERR(cqr))
2919 return PTR_ERR(cqr);
2920
2921 ret = dasd_sleep_on(cqr);
8e09f215 2922 dasd_sfree_request(cqr, cqr->memdev);
17283b56
CH		 2923 return ret;
2924}
aaff0f64 2925EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
20c64468 2926
f3eb5384
SW		 2927/*
2928 * In command mode and transport mode we need to look for sense
2929 * data in different places. The sense data itself is allways
2930 * an array of 32 bytes, so we can unify the sense data access
2931 * for both modes.
2932 */
2933char *dasd_get_sense(struct irb *irb)
2934{
2935 struct tsb *tsb = NULL;
2936 char *sense = NULL;
2937
2938 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
2939 if (irb->scsw.tm.tcw)
2940 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
2941 irb->scsw.tm.tcw);
2942 if (tsb && tsb->length == 64 && tsb->flags)
2943 switch (tsb->flags & 0x07) {
2944 case 1: /* tsa_iostat */
2945 sense = tsb->tsa.iostat.sense;
2946 break;
2947 case 2: /* tsa_ddpc */
2948 sense = tsb->tsa.ddpc.sense;
2949 break;
2950 default:
2951 /* currently we don't use interrogate data */
2952 break;
2953 }
2954 } else if (irb->esw.esw0.erw.cons) {
2955 sense = irb->ecw;
2956 }
2957 return sense;
2958}
2959EXPORT_SYMBOL_GPL(dasd_get_sense);
2960
8e09f215 2961static int __init dasd_init(void)
1da177e4
LT		 2962{
2963 int rc;
2964
2965 init_waitqueue_head(&dasd_init_waitq);
8f61701b 2966 init_waitqueue_head(&dasd_flush_wq);
c80ee724 2967 init_waitqueue_head(&generic_waitq);
1da177e4
LT		 2968
2969 /* register 'common' DASD debug area, used for all DBF_XXX calls */
361f494d 2970 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
1da177e4
LT		 2971 if (dasd_debug_area == NULL) {
2972 rc = -ENOMEM;
2973 goto failed;
2974 }
2975 debug_register_view(dasd_debug_area, &debug_sprintf_view);
b0035f12 2976 debug_set_level(dasd_debug_area, DBF_WARNING);
1da177e4
LT		 2977
2978 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
2979
2980 dasd_diag_discipline_pointer = NULL;
2981
1da177e4
LT		 2982 rc = dasd_devmap_init();
2983 if (rc)
2984 goto failed;
2985 rc = dasd_gendisk_init();
2986 if (rc)
2987 goto failed;
2988 rc = dasd_parse();
2989 if (rc)
2990 goto failed;
20c64468
SW		 2991 rc = dasd_eer_init();
2992 if (rc)
2993 goto failed;
1da177e4
LT		 2994#ifdef CONFIG_PROC_FS
2995 rc = dasd_proc_init();
2996 if (rc)
2997 goto failed;
2998#endif
2999
3000 return 0;
3001failed:
fc19f381 3002 pr_info("The DASD device driver could not be initialized\n");
1da177e4
LT		 3003 dasd_exit();
3004 return rc;
3005}
3006
3007module_init(dasd_init);
3008module_exit(dasd_exit);
3009
3010EXPORT_SYMBOL(dasd_debug_area);
3011EXPORT_SYMBOL(dasd_diag_discipline_pointer);
3012
3013EXPORT_SYMBOL(dasd_add_request_head);
3014EXPORT_SYMBOL(dasd_add_request_tail);
3015EXPORT_SYMBOL(dasd_cancel_req);
8e09f215
SW		 3016EXPORT_SYMBOL(dasd_device_clear_timer);
3017EXPORT_SYMBOL(dasd_block_clear_timer);
1da177e4
LT		 3018EXPORT_SYMBOL(dasd_enable_device);
3019EXPORT_SYMBOL(dasd_int_handler);
3020EXPORT_SYMBOL(dasd_kfree_request);
3021EXPORT_SYMBOL(dasd_kick_device);
3022EXPORT_SYMBOL(dasd_kmalloc_request);
8e09f215
SW		 3023EXPORT_SYMBOL(dasd_schedule_device_bh);
3024EXPORT_SYMBOL(dasd_schedule_block_bh);
1da177e4 3025EXPORT_SYMBOL(dasd_set_target_state);
8e09f215
SW		 3026EXPORT_SYMBOL(dasd_device_set_timer);
3027EXPORT_SYMBOL(dasd_block_set_timer);
1da177e4
LT		 3028EXPORT_SYMBOL(dasd_sfree_request);
3029EXPORT_SYMBOL(dasd_sleep_on);
3030EXPORT_SYMBOL(dasd_sleep_on_immediatly);
3031EXPORT_SYMBOL(dasd_sleep_on_interruptible);
3032EXPORT_SYMBOL(dasd_smalloc_request);
3033EXPORT_SYMBOL(dasd_start_IO);
3034EXPORT_SYMBOL(dasd_term_IO);
3035
3036EXPORT_SYMBOL_GPL(dasd_generic_probe);
3037EXPORT_SYMBOL_GPL(dasd_generic_remove);
3038EXPORT_SYMBOL_GPL(dasd_generic_notify);
3039EXPORT_SYMBOL_GPL(dasd_generic_set_online);
3040EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
8e09f215
SW		 3041EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
3042EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
3043EXPORT_SYMBOL_GPL(dasd_alloc_block);
3044EXPORT_SYMBOL_GPL(dasd_free_block);
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