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[S390] Add PSW restart shutdown trigger
[deliverable/linux.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>
4fa52aa7
SW		 25#include <linux/debugfs.h>
26#include <linux/seq_file.h>
1da177e4
LT		 27
28#include <asm/ccwdev.h>
29#include <asm/ebcdic.h>
30#include <asm/idals.h>
f3eb5384 31#include <asm/itcw.h>
33b62a30 32#include <asm/diag.h>
1da177e4
LT		 33
34/* This is ugly... */
35#define PRINTK_HEADER "dasd:"
36
37#include "dasd_int.h"
38/*
39 * SECTION: Constant definitions to be used within this file
40 */
41#define DASD_CHANQ_MAX_SIZE 4
42
1c1e093c
SW		 43#define DASD_SLEEPON_START_TAG (void *) 1
44#define DASD_SLEEPON_END_TAG (void *) 2
45
1da177e4
LT		 46/*
47 * SECTION: exported variables of dasd.c
48 */
49debug_info_t *dasd_debug_area;
4fa52aa7 50static struct dentry *dasd_debugfs_root_entry;
1da177e4 51struct dasd_discipline *dasd_diag_discipline_pointer;
2b67fc46 52void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
1da177e4
LT		 53
54MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
55MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
56 " Copyright 2000 IBM Corporation");
57MODULE_SUPPORTED_DEVICE("dasd");
1da177e4
LT		 58MODULE_LICENSE("GPL");
59
60/*
61 * SECTION: prototypes for static functions of dasd.c
62 */
8e09f215
SW		 63static int dasd_alloc_queue(struct dasd_block *);
64static void dasd_setup_queue(struct dasd_block *);
65static void dasd_free_queue(struct dasd_block *);
66static void dasd_flush_request_queue(struct dasd_block *);
67static int dasd_flush_block_queue(struct dasd_block *);
68static void dasd_device_tasklet(struct dasd_device *);
69static void dasd_block_tasklet(struct dasd_block *);
4927b3f7 70static void do_kick_device(struct work_struct *);
d41dd122 71static void do_restore_device(struct work_struct *);
501183f2 72static void do_reload_device(struct work_struct *);
8e09f215 73static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
48cae885
SW		 74static void dasd_device_timeout(unsigned long);
75static void dasd_block_timeout(unsigned long);
eb6e199b 76static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *);
4fa52aa7
SW		 77static void dasd_profile_init(struct dasd_profile *, struct dentry *);
78static void dasd_profile_exit(struct dasd_profile *);
1da177e4
LT		 79
80/*
81 * SECTION: Operations on the device structure.
82 */
83static wait_queue_head_t dasd_init_waitq;
8f61701b 84static wait_queue_head_t dasd_flush_wq;
c80ee724 85static wait_queue_head_t generic_waitq;
1da177e4
LT		 86
87/*
88 * Allocate memory for a new device structure.
89 */
8e09f215 90struct dasd_device *dasd_alloc_device(void)
1da177e4
LT		 91{
92 struct dasd_device *device;
93
8e09f215
SW		 94 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC);
95 if (!device)
1da177e4 96 return ERR_PTR(-ENOMEM);
1da177e4
LT		 97
98 /* Get two pages for normal block device operations. */
99 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
8e09f215 100 if (!device->ccw_mem) {
1da177e4
LT		 101 kfree(device);
102 return ERR_PTR(-ENOMEM);
103 }
104 /* Get one page for error recovery. */
105 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
8e09f215 106 if (!device->erp_mem) {
1da177e4
LT		 107 free_pages((unsigned long) device->ccw_mem, 1);
108 kfree(device);
109 return ERR_PTR(-ENOMEM);
110 }
111
112 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
113 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
114 spin_lock_init(&device->mem_lock);
8e09f215 115 atomic_set(&device->tasklet_scheduled, 0);
138c014d 116 tasklet_init(&device->tasklet,
8e09f215 117 (void (*)(unsigned long)) dasd_device_tasklet,
1da177e4
LT		 118 (unsigned long) device);
119 INIT_LIST_HEAD(&device->ccw_queue);
120 init_timer(&device->timer);
48cae885
SW		 121 device->timer.function = dasd_device_timeout;
122 device->timer.data = (unsigned long) device;
4927b3f7 123 INIT_WORK(&device->kick_work, do_kick_device);
d41dd122 124 INIT_WORK(&device->restore_device, do_restore_device);
501183f2 125 INIT_WORK(&device->reload_device, do_reload_device);
1da177e4
LT		 126 device->state = DASD_STATE_NEW;
127 device->target = DASD_STATE_NEW;
9eb25122 128 mutex_init(&device->state_mutex);
4fa52aa7 129 spin_lock_init(&device->profile.lock);
1da177e4
LT		 130 return device;
131}
132
133/*
134 * Free memory of a device structure.
135 */
8e09f215 136void dasd_free_device(struct dasd_device *device)
1da177e4 137{
17fd682e 138 kfree(device->private);
1da177e4
LT		 139 free_page((unsigned long) device->erp_mem);
140 free_pages((unsigned long) device->ccw_mem, 1);
141 kfree(device);
142}
143
8e09f215
SW		 144/*
145 * Allocate memory for a new device structure.
146 */
147struct dasd_block *dasd_alloc_block(void)
148{
149 struct dasd_block *block;
150
151 block = kzalloc(sizeof(*block), GFP_ATOMIC);
152 if (!block)
153 return ERR_PTR(-ENOMEM);
154 /* open_count = 0 means device online but not in use */
155 atomic_set(&block->open_count, -1);
156
157 spin_lock_init(&block->request_queue_lock);
158 atomic_set(&block->tasklet_scheduled, 0);
159 tasklet_init(&block->tasklet,
160 (void (*)(unsigned long)) dasd_block_tasklet,
161 (unsigned long) block);
162 INIT_LIST_HEAD(&block->ccw_queue);
163 spin_lock_init(&block->queue_lock);
164 init_timer(&block->timer);
48cae885
SW		 165 block->timer.function = dasd_block_timeout;
166 block->timer.data = (unsigned long) block;
4fa52aa7 167 spin_lock_init(&block->profile.lock);
8e09f215
SW		 168
169 return block;
170}
171
172/*
173 * Free memory of a device structure.
174 */
175void dasd_free_block(struct dasd_block *block)
176{
177 kfree(block);
178}
179
1da177e4
LT		 180/*
181 * Make a new device known to the system.
182 */
8e09f215 183static int dasd_state_new_to_known(struct dasd_device *device)
1da177e4
LT		 184{
185 int rc;
186
187 /*
138c014d 188 * As long as the device is not in state DASD_STATE_NEW we want to
1da177e4
LT		 189 * keep the reference count > 0.
190 */
191 dasd_get_device(device);
192
8e09f215
SW		 193 if (device->block) {
194 rc = dasd_alloc_queue(device->block);
195 if (rc) {
196 dasd_put_device(device);
197 return rc;
198 }
1da177e4 199 }
1da177e4
LT		 200 device->state = DASD_STATE_KNOWN;
201 return 0;
202}
203
204/*
205 * Let the system forget about a device.
206 */
8e09f215 207static int dasd_state_known_to_new(struct dasd_device *device)
1da177e4 208{
20c64468
SW		 209 /* Disable extended error reporting for this device. */
210 dasd_eer_disable(device);
1da177e4 211 /* Forget the discipline information. */
8e09f215
SW		 212 if (device->discipline) {
213 if (device->discipline->uncheck_device)
214 device->discipline->uncheck_device(device);
aa88861f 215 module_put(device->discipline->owner);
8e09f215 216 }
1da177e4 217 device->discipline = NULL;
aa88861f
PO		 218 if (device->base_discipline)
219 module_put(device->base_discipline->owner);
220 device->base_discipline = NULL;
1da177e4
LT		 221 device->state = DASD_STATE_NEW;
222
8e09f215
SW		 223 if (device->block)
224 dasd_free_queue(device->block);
1da177e4
LT		 225
226 /* Give up reference we took in dasd_state_new_to_known. */
227 dasd_put_device(device);
8f61701b 228 return 0;
1da177e4
LT		 229}
230
4fa52aa7
SW		 231static struct dentry *dasd_debugfs_setup(const char *name,
232 struct dentry *base_dentry)
233{
234 struct dentry *pde;
235
236 if (!base_dentry)
237 return NULL;
238 pde = debugfs_create_dir(name, base_dentry);
239 if (!pde || IS_ERR(pde))
240 return NULL;
241 return pde;
242}
243
1da177e4
LT		 244/*
245 * Request the irq line for the device.
246 */
8e09f215 247static int dasd_state_known_to_basic(struct dasd_device *device)
1da177e4 248{
4fa52aa7 249 struct dasd_block *block = device->block;
1da177e4
LT		 250 int rc;
251
252 /* Allocate and register gendisk structure. */
4fa52aa7
SW		 253 if (block) {
254 rc = dasd_gendisk_alloc(block);
8e09f215
SW		 255 if (rc)
256 return rc;
4fa52aa7
SW		 257 block->debugfs_dentry =
258 dasd_debugfs_setup(block->gdp->disk_name,
259 dasd_debugfs_root_entry);
260 dasd_profile_init(&block->profile, block->debugfs_dentry);
261 if (dasd_global_profile_level == DASD_PROFILE_ON)
262 dasd_profile_on(&device->block->profile);
263 }
264 device->debugfs_dentry =
265 dasd_debugfs_setup(dev_name(&device->cdev->dev),
266 dasd_debugfs_root_entry);
267 dasd_profile_init(&device->profile, device->debugfs_dentry);
268
1da177e4 269 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
fc19f381 270 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1,
8e09f215 271 8 * sizeof(long));
1da177e4 272 debug_register_view(device->debug_area, &debug_sprintf_view);
b0035f12 273 debug_set_level(device->debug_area, DBF_WARNING);
1da177e4
LT		 274 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
275
276 device->state = DASD_STATE_BASIC;
277 return 0;
278}
279
280/*
281 * Release the irq line for the device. Terminate any running i/o.
282 */
8e09f215 283static int dasd_state_basic_to_known(struct dasd_device *device)
1da177e4 284{
8f61701b 285 int rc;
8e09f215 286 if (device->block) {
4fa52aa7
SW		 287 dasd_profile_exit(&device->block->profile);
288 if (device->block->debugfs_dentry)
289 debugfs_remove(device->block->debugfs_dentry);
8e09f215
SW		 290 dasd_gendisk_free(device->block);
291 dasd_block_clear_timer(device->block);
292 }
293 rc = dasd_flush_device_queue(device);
8f61701b
HH		 294 if (rc)
295 return rc;
8e09f215 296 dasd_device_clear_timer(device);
4fa52aa7
SW		 297 dasd_profile_exit(&device->profile);
298 if (device->debugfs_dentry)
299 debugfs_remove(device->debugfs_dentry);
8f61701b 300
1da177e4
LT		 301 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
302 if (device->debug_area != NULL) {
303 debug_unregister(device->debug_area);
304 device->debug_area = NULL;
305 }
306 device->state = DASD_STATE_KNOWN;
8f61701b 307 return 0;
1da177e4
LT		 308}
309
310/*
311 * Do the initial analysis. The do_analysis function may return
312 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
313 * until the discipline decides to continue the startup sequence
314 * by calling the function dasd_change_state. The eckd disciplines
315 * uses this to start a ccw that detects the format. The completion
316 * interrupt for this detection ccw uses the kernel event daemon to
317 * trigger the call to dasd_change_state. All this is done in the
318 * discipline code, see dasd_eckd.c.
90f0094d
HH		 319 * After the analysis ccw is done (do_analysis returned 0) the block
320 * device is setup.
321 * In case the analysis returns an error, the device setup is stopped
322 * (a fake disk was already added to allow formatting).
1da177e4 323 */
8e09f215 324static int dasd_state_basic_to_ready(struct dasd_device *device)
1da177e4
LT		 325{
326 int rc;
8e09f215 327 struct dasd_block *block;
1da177e4
LT		 328
329 rc = 0;
8e09f215 330 block = device->block;
90f0094d 331 /* make disk known with correct capacity */
8e09f215
SW		 332 if (block) {
333 if (block->base->discipline->do_analysis != NULL)
334 rc = block->base->discipline->do_analysis(block);
335 if (rc) {
336 if (rc != -EAGAIN)
337 device->state = DASD_STATE_UNFMT;
338 return rc;
339 }
340 dasd_setup_queue(block);
341 set_capacity(block->gdp,
342 block->blocks << block->s2b_shift);
343 device->state = DASD_STATE_READY;
344 rc = dasd_scan_partitions(block);
345 if (rc)
346 device->state = DASD_STATE_BASIC;
347 } else {
348 device->state = DASD_STATE_READY;
349 }
90f0094d 350 return rc;
1da177e4
LT		 351}
352
353/*
354 * Remove device from block device layer. Destroy dirty buffers.
355 * Forget format information. Check if the target level is basic
356 * and if it is create fake disk for formatting.
357 */
8e09f215 358static int dasd_state_ready_to_basic(struct dasd_device *device)
1da177e4 359{
8f61701b
HH		 360 int rc;
361
1da177e4 362 device->state = DASD_STATE_BASIC;
8e09f215
SW		 363 if (device->block) {
364 struct dasd_block *block = device->block;
365 rc = dasd_flush_block_queue(block);
366 if (rc) {
367 device->state = DASD_STATE_READY;
368 return rc;
369 }
8e09f215 370 dasd_flush_request_queue(block);
b695adfa 371 dasd_destroy_partitions(block);
8e09f215
SW		 372 block->blocks = 0;
373 block->bp_block = 0;
374 block->s2b_shift = 0;
375 }
8f61701b 376 return 0;
1da177e4
LT		 377}
378
90f0094d
HH		 379/*
380 * Back to basic.
381 */
8e09f215 382static int dasd_state_unfmt_to_basic(struct dasd_device *device)
90f0094d
HH		 383{
384 device->state = DASD_STATE_BASIC;
8f61701b 385 return 0;
90f0094d
HH		 386}
387
1da177e4
LT		 388/*
389 * Make the device online and schedule the bottom half to start
390 * the requeueing of requests from the linux request queue to the
391 * ccw queue.
392 */
8f61701b 393static int
1da177e4
LT		 394dasd_state_ready_to_online(struct dasd_device * device)
395{
8e09f215 396 int rc;
1301809b
SW		 397 struct gendisk *disk;
398 struct disk_part_iter piter;
399 struct hd_struct *part;
8e09f215
SW		 400
401 if (device->discipline->ready_to_online) {
402 rc = device->discipline->ready_to_online(device);
403 if (rc)
404 return rc;
405 }
1da177e4 406 device->state = DASD_STATE_ONLINE;
1301809b 407 if (device->block) {
8e09f215 408 dasd_schedule_block_bh(device->block);
e4dbb0f2
SH		 409 if ((device->features & DASD_FEATURE_USERAW)) {
410 disk = device->block->gdp;
411 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
412 return 0;
413 }
1301809b
SW		 414 disk = device->block->bdev->bd_disk;
415 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
416 while ((part = disk_part_iter_next(&piter)))
417 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
418 disk_part_iter_exit(&piter);
419 }
1da177e4
LT		 420 return 0;
421}
422
423/*
424 * Stop the requeueing of requests again.
425 */
8e09f215 426static int dasd_state_online_to_ready(struct dasd_device *device)
1da177e4 427{
8e09f215 428 int rc;
1301809b
SW		 429 struct gendisk *disk;
430 struct disk_part_iter piter;
431 struct hd_struct *part;
8e09f215
SW		 432
433 if (device->discipline->online_to_ready) {
434 rc = device->discipline->online_to_ready(device);
435 if (rc)
436 return rc;
437 }
1da177e4 438 device->state = DASD_STATE_READY;
e4dbb0f2 439 if (device->block && !(device->features & DASD_FEATURE_USERAW)) {
1301809b
SW		 440 disk = device->block->bdev->bd_disk;
441 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
442 while ((part = disk_part_iter_next(&piter)))
443 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
444 disk_part_iter_exit(&piter);
445 }
8f61701b 446 return 0;
1da177e4
LT		 447}
448
449/*
450 * Device startup state changes.
451 */
8e09f215 452static int dasd_increase_state(struct dasd_device *device)
1da177e4
LT		 453{
454 int rc;
455
456 rc = 0;
457 if (device->state == DASD_STATE_NEW &&
458 device->target >= DASD_STATE_KNOWN)
459 rc = dasd_state_new_to_known(device);
460
461 if (!rc &&
462 device->state == DASD_STATE_KNOWN &&
463 device->target >= DASD_STATE_BASIC)
464 rc = dasd_state_known_to_basic(device);
465
466 if (!rc &&
467 device->state == DASD_STATE_BASIC &&
468 device->target >= DASD_STATE_READY)
469 rc = dasd_state_basic_to_ready(device);
470
39ccf95e
HH		 471 if (!rc &&
472 device->state == DASD_STATE_UNFMT &&
473 device->target > DASD_STATE_UNFMT)
474 rc = -EPERM;
475
1da177e4
LT		 476 if (!rc &&
477 device->state == DASD_STATE_READY &&
478 device->target >= DASD_STATE_ONLINE)
479 rc = dasd_state_ready_to_online(device);
480
481 return rc;
482}
483
484/*
485 * Device shutdown state changes.
486 */
8e09f215 487static int dasd_decrease_state(struct dasd_device *device)
1da177e4 488{
8f61701b
HH		 489 int rc;
490
491 rc = 0;
1da177e4
LT		 492 if (device->state == DASD_STATE_ONLINE &&
493 device->target <= DASD_STATE_READY)
8f61701b 494 rc = dasd_state_online_to_ready(device);
138c014d 495
8f61701b
HH		 496 if (!rc &&
497 device->state == DASD_STATE_READY &&
1da177e4 498 device->target <= DASD_STATE_BASIC)
8f61701b 499 rc = dasd_state_ready_to_basic(device);
90f0094d 500
8f61701b
HH		 501 if (!rc &&
502 device->state == DASD_STATE_UNFMT &&
90f0094d 503 device->target <= DASD_STATE_BASIC)
8f61701b 504 rc = dasd_state_unfmt_to_basic(device);
90f0094d 505
8f61701b
HH		 506 if (!rc &&
507 device->state == DASD_STATE_BASIC &&
1da177e4 508 device->target <= DASD_STATE_KNOWN)
8f61701b 509 rc = dasd_state_basic_to_known(device);
138c014d 510
8f61701b
HH		 511 if (!rc &&
512 device->state == DASD_STATE_KNOWN &&
1da177e4 513 device->target <= DASD_STATE_NEW)
8f61701b 514 rc = dasd_state_known_to_new(device);
1da177e4 515
8f61701b 516 return rc;
1da177e4
LT		 517}
518
519/*
520 * This is the main startup/shutdown routine.
521 */
8e09f215 522static void dasd_change_state(struct dasd_device *device)
1da177e4 523{
181d9522 524 int rc;
1da177e4
LT		 525
526 if (device->state == device->target)
527 /* Already where we want to go today... */
528 return;
529 if (device->state < device->target)
530 rc = dasd_increase_state(device);
531 else
532 rc = dasd_decrease_state(device);
181d9522
SO		 533 if (rc == -EAGAIN)
534 return;
535 if (rc)
536 device->target = device->state;
1da177e4 537
9eb25122 538 if (device->state == device->target)
1da177e4 539 wake_up(&dasd_init_waitq);
4dfd5c45
HH		 540
541 /* let user-space know that the device status changed */
542 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
1da177e4
LT		 543}
544
545/*
546 * Kick starter for devices that did not complete the startup/shutdown
547 * procedure or were sleeping because of a pending state.
548 * dasd_kick_device will schedule a call do do_kick_device to the kernel
549 * event daemon.
550 */
8e09f215 551static void do_kick_device(struct work_struct *work)
1da177e4 552{
4927b3f7 553 struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
9eb25122 554 mutex_lock(&device->state_mutex);
1da177e4 555 dasd_change_state(device);
9eb25122 556 mutex_unlock(&device->state_mutex);
8e09f215 557 dasd_schedule_device_bh(device);
1da177e4
LT		 558 dasd_put_device(device);
559}
560
8e09f215 561void dasd_kick_device(struct dasd_device *device)
1da177e4
LT		 562{
563 dasd_get_device(device);
564 /* queue call to dasd_kick_device to the kernel event daemon. */
565 schedule_work(&device->kick_work);
566}
567
501183f2
SH		 568/*
569 * dasd_reload_device will schedule a call do do_reload_device to the kernel
570 * event daemon.
571 */
572static void do_reload_device(struct work_struct *work)
573{
574 struct dasd_device *device = container_of(work, struct dasd_device,
575 reload_device);
576 device->discipline->reload(device);
577 dasd_put_device(device);
578}
579
580void dasd_reload_device(struct dasd_device *device)
581{
582 dasd_get_device(device);
583 /* queue call to dasd_reload_device to the kernel event daemon. */
584 schedule_work(&device->reload_device);
585}
586EXPORT_SYMBOL(dasd_reload_device);
587
d41dd122
SH		 588/*
589 * dasd_restore_device will schedule a call do do_restore_device to the kernel
590 * event daemon.
591 */
592static void do_restore_device(struct work_struct *work)
593{
594 struct dasd_device *device = container_of(work, struct dasd_device,
595 restore_device);
596 device->cdev->drv->restore(device->cdev);
597 dasd_put_device(device);
598}
599
600void dasd_restore_device(struct dasd_device *device)
601{
602 dasd_get_device(device);
603 /* queue call to dasd_restore_device to the kernel event daemon. */
604 schedule_work(&device->restore_device);
605}
606
1da177e4
LT		 607/*
608 * Set the target state for a device and starts the state change.
609 */
8e09f215 610void dasd_set_target_state(struct dasd_device *device, int target)
1da177e4 611{
f3445a1a 612 dasd_get_device(device);
9eb25122 613 mutex_lock(&device->state_mutex);
1da177e4
LT		 614 /* If we are in probeonly mode stop at DASD_STATE_READY. */
615 if (dasd_probeonly && target > DASD_STATE_READY)
616 target = DASD_STATE_READY;
617 if (device->target != target) {
9eb25122 618 if (device->state == target)
1da177e4
LT		 619 wake_up(&dasd_init_waitq);
620 device->target = target;
621 }
622 if (device->state != device->target)
623 dasd_change_state(device);
9eb25122
SH		 624 mutex_unlock(&device->state_mutex);
625 dasd_put_device(device);
1da177e4
LT		 626}
627
628/*
629 * Enable devices with device numbers in [from..to].
630 */
8e09f215 631static inline int _wait_for_device(struct dasd_device *device)
1da177e4
LT		 632{
633 return (device->state == device->target);
634}
635
8e09f215 636void dasd_enable_device(struct dasd_device *device)
1da177e4
LT		 637{
638 dasd_set_target_state(device, DASD_STATE_ONLINE);
639 if (device->state <= DASD_STATE_KNOWN)
640 /* No discipline for device found. */
641 dasd_set_target_state(device, DASD_STATE_NEW);
642 /* Now wait for the devices to come up. */
643 wait_event(dasd_init_waitq, _wait_for_device(device));
644}
645
646/*
647 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
648 */
1da177e4 649
4fa52aa7 650unsigned int dasd_global_profile_level = DASD_PROFILE_OFF;
1da177e4 651
4fa52aa7
SW		 652#ifdef CONFIG_DASD_PROFILE
653struct dasd_profile_info dasd_global_profile_data;
654static struct dentry *dasd_global_profile_dentry;
655static struct dentry *dasd_debugfs_global_entry;
1da177e4
LT		 656
657/*
658 * Add profiling information for cqr before execution.
659 */
8e09f215
SW		 660static void dasd_profile_start(struct dasd_block *block,
661 struct dasd_ccw_req *cqr,
662 struct request *req)
1da177e4
LT		 663{
664 struct list_head *l;
665 unsigned int counter;
4fa52aa7 666 struct dasd_device *device;
1da177e4
LT		 667
668 /* count the length of the chanq for statistics */
669 counter = 0;
4fa52aa7
SW		 670 if (dasd_global_profile_level || block->profile.data)
671 list_for_each(l, &block->ccw_queue)
672 if (++counter >= 31)
673 break;
674
675 if (dasd_global_profile_level) {
676 dasd_global_profile_data.dasd_io_nr_req[counter]++;
677 if (rq_data_dir(req) == READ)
678 dasd_global_profile_data.dasd_read_nr_req[counter]++;
679 }
680
681 spin_lock(&block->profile.lock);
682 if (block->profile.data)
683 block->profile.data->dasd_io_nr_req[counter]++;
684 if (rq_data_dir(req) == READ)
685 block->profile.data->dasd_read_nr_req[counter]++;
686 spin_unlock(&block->profile.lock);
687
688 /*
689 * We count the request for the start device, even though it may run on
690 * some other device due to error recovery. This way we make sure that
691 * we count each request only once.
692 */
693 device = cqr->startdev;
694 if (device->profile.data) {
695 counter = 1; /* request is not yet queued on the start device */
696 list_for_each(l, &device->ccw_queue)
697 if (++counter >= 31)
698 break;
699 }
700 spin_lock(&device->profile.lock);
701 if (device->profile.data) {
702 device->profile.data->dasd_io_nr_req[counter]++;
703 if (rq_data_dir(req) == READ)
704 device->profile.data->dasd_read_nr_req[counter]++;
705 }
706 spin_unlock(&device->profile.lock);
1da177e4
LT		 707}
708
709/*
710 * Add profiling information for cqr after execution.
711 */
4fa52aa7
SW		 712
713#define dasd_profile_counter(value, index) \
714{ \
715 for (index = 0; index < 31 && value >> (2+index); index++) \
716 ; \
717}
718
719static void dasd_profile_end_add_data(struct dasd_profile_info *data,
720 int is_alias,
721 int is_tpm,
722 int is_read,
723 long sectors,
724 int sectors_ind,
725 int tottime_ind,
726 int tottimeps_ind,
727 int strtime_ind,
728 int irqtime_ind,
729 int irqtimeps_ind,
730 int endtime_ind)
731{
732 /* in case of an overflow, reset the whole profile */
733 if (data->dasd_io_reqs == UINT_MAX) {
734 memset(data, 0, sizeof(*data));
735 getnstimeofday(&data->starttod);
736 }
737 data->dasd_io_reqs++;
738 data->dasd_io_sects += sectors;
739 if (is_alias)
740 data->dasd_io_alias++;
741 if (is_tpm)
742 data->dasd_io_tpm++;
743
744 data->dasd_io_secs[sectors_ind]++;
745 data->dasd_io_times[tottime_ind]++;
746 data->dasd_io_timps[tottimeps_ind]++;
747 data->dasd_io_time1[strtime_ind]++;
748 data->dasd_io_time2[irqtime_ind]++;
749 data->dasd_io_time2ps[irqtimeps_ind]++;
750 data->dasd_io_time3[endtime_ind]++;
751
752 if (is_read) {
753 data->dasd_read_reqs++;
754 data->dasd_read_sects += sectors;
755 if (is_alias)
756 data->dasd_read_alias++;
757 if (is_tpm)
758 data->dasd_read_tpm++;
759 data->dasd_read_secs[sectors_ind]++;
760 data->dasd_read_times[tottime_ind]++;
761 data->dasd_read_time1[strtime_ind]++;
762 data->dasd_read_time2[irqtime_ind]++;
763 data->dasd_read_time3[endtime_ind]++;
764 }
765}
766
8e09f215
SW		 767static void dasd_profile_end(struct dasd_block *block,
768 struct dasd_ccw_req *cqr,
769 struct request *req)
1da177e4
LT		 770{
771 long strtime, irqtime, endtime, tottime; /* in microseconds */
772 long tottimeps, sectors;
4fa52aa7
SW		 773 struct dasd_device *device;
774 int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind;
775 int irqtime_ind, irqtimeps_ind, endtime_ind;
1da177e4 776
4fa52aa7
SW		 777 device = cqr->startdev;
778 if (!(dasd_global_profile_level ||
779 block->profile.data ||
780 device->profile.data))
1da177e4
LT		 781 return;
782
83096ebf 783 sectors = blk_rq_sectors(req);
1da177e4
LT		 784 if (!cqr->buildclk || !cqr->startclk ||
785 !cqr->stopclk || !cqr->endclk ||
786 !sectors)
787 return;
788
789 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
790 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
791 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
792 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
793 tottimeps = tottime / sectors;
794
4fa52aa7
SW		 795 dasd_profile_counter(sectors, sectors_ind);
796 dasd_profile_counter(tottime, tottime_ind);
797 dasd_profile_counter(tottimeps, tottimeps_ind);
798 dasd_profile_counter(strtime, strtime_ind);
799 dasd_profile_counter(irqtime, irqtime_ind);
800 dasd_profile_counter(irqtime / sectors, irqtimeps_ind);
801 dasd_profile_counter(endtime, endtime_ind);
802
803 if (dasd_global_profile_level) {
804 dasd_profile_end_add_data(&dasd_global_profile_data,
805 cqr->startdev != block->base,
806 cqr->cpmode == 1,
807 rq_data_dir(req) == READ,
808 sectors, sectors_ind, tottime_ind,
809 tottimeps_ind, strtime_ind,
810 irqtime_ind, irqtimeps_ind,
811 endtime_ind);
812 }
813
814 spin_lock(&block->profile.lock);
815 if (block->profile.data)
816 dasd_profile_end_add_data(block->profile.data,
817 cqr->startdev != block->base,
818 cqr->cpmode == 1,
819 rq_data_dir(req) == READ,
820 sectors, sectors_ind, tottime_ind,
821 tottimeps_ind, strtime_ind,
822 irqtime_ind, irqtimeps_ind,
823 endtime_ind);
824 spin_unlock(&block->profile.lock);
825
826 spin_lock(&device->profile.lock);
827 if (device->profile.data)
828 dasd_profile_end_add_data(device->profile.data,
829 cqr->startdev != block->base,
830 cqr->cpmode == 1,
831 rq_data_dir(req) == READ,
832 sectors, sectors_ind, tottime_ind,
833 tottimeps_ind, strtime_ind,
834 irqtime_ind, irqtimeps_ind,
835 endtime_ind);
836 spin_unlock(&device->profile.lock);
837}
838
839void dasd_profile_reset(struct dasd_profile *profile)
840{
841 struct dasd_profile_info *data;
842
843 spin_lock_bh(&profile->lock);
844 data = profile->data;
845 if (!data) {
846 spin_unlock_bh(&profile->lock);
847 return;
848 }
849 memset(data, 0, sizeof(*data));
850 getnstimeofday(&data->starttod);
851 spin_unlock_bh(&profile->lock);
852}
853
854void dasd_global_profile_reset(void)
855{
856 memset(&dasd_global_profile_data, 0, sizeof(dasd_global_profile_data));
857 getnstimeofday(&dasd_global_profile_data.starttod);
858}
859
860int dasd_profile_on(struct dasd_profile *profile)
861{
862 struct dasd_profile_info *data;
863
864 data = kzalloc(sizeof(*data), GFP_KERNEL);
865 if (!data)
866 return -ENOMEM;
867 spin_lock_bh(&profile->lock);
868 if (profile->data) {
869 spin_unlock_bh(&profile->lock);
870 kfree(data);
871 return 0;
872 }
873 getnstimeofday(&data->starttod);
874 profile->data = data;
875 spin_unlock_bh(&profile->lock);
876 return 0;
877}
878
879void dasd_profile_off(struct dasd_profile *profile)
880{
881 spin_lock_bh(&profile->lock);
882 kfree(profile->data);
883 profile->data = NULL;
884 spin_unlock_bh(&profile->lock);
885}
886
887char *dasd_get_user_string(const char __user *user_buf, size_t user_len)
888{
889 char *buffer;
890
891 buffer = kmalloc(user_len + 1, GFP_KERNEL);
892 if (buffer == NULL)
893 return ERR_PTR(-ENOMEM);
894 if (copy_from_user(buffer, user_buf, user_len) != 0) {
895 kfree(buffer);
896 return ERR_PTR(-EFAULT);
897 }
898 /* got the string, now strip linefeed. */
899 if (buffer[user_len - 1] == '\n')
900 buffer[user_len - 1] = 0;
901 else
902 buffer[user_len] = 0;
903 return buffer;
1da177e4 904}
4fa52aa7
SW		 905
906static ssize_t dasd_stats_write(struct file *file,
907 const char __user *user_buf,
908 size_t user_len, loff_t *pos)
909{
910 char *buffer, *str;
911 int rc;
912 struct seq_file *m = (struct seq_file *)file->private_data;
913 struct dasd_profile *prof = m->private;
914
915 if (user_len > 65536)
916 user_len = 65536;
917 buffer = dasd_get_user_string(user_buf, user_len);
918 if (IS_ERR(buffer))
919 return PTR_ERR(buffer);
920
921 str = skip_spaces(buffer);
922 rc = user_len;
923 if (strncmp(str, "reset", 5) == 0) {
924 dasd_profile_reset(prof);
925 } else if (strncmp(str, "on", 2) == 0) {
926 rc = dasd_profile_on(prof);
927 if (!rc)
928 rc = user_len;
929 } else if (strncmp(str, "off", 3) == 0) {
930 dasd_profile_off(prof);
931 } else
932 rc = -EINVAL;
933 kfree(buffer);
934 return rc;
935}
936
937static void dasd_stats_array(struct seq_file *m, unsigned int *array)
938{
939 int i;
940
941 for (i = 0; i < 32; i++)
942 seq_printf(m, "%u ", array[i]);
943 seq_putc(m, '\n');
944}
945
946static void dasd_stats_seq_print(struct seq_file *m,
947 struct dasd_profile_info *data)
948{
949 seq_printf(m, "start_time %ld.%09ld\n",
950 data->starttod.tv_sec, data->starttod.tv_nsec);
951 seq_printf(m, "total_requests %u\n", data->dasd_io_reqs);
952 seq_printf(m, "total_sectors %u\n", data->dasd_io_sects);
953 seq_printf(m, "total_pav %u\n", data->dasd_io_alias);
954 seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm);
955 seq_printf(m, "histogram_sectors ");
956 dasd_stats_array(m, data->dasd_io_secs);
957 seq_printf(m, "histogram_io_times ");
958 dasd_stats_array(m, data->dasd_io_times);
959 seq_printf(m, "histogram_io_times_weighted ");
960 dasd_stats_array(m, data->dasd_io_timps);
961 seq_printf(m, "histogram_time_build_to_ssch ");
962 dasd_stats_array(m, data->dasd_io_time1);
963 seq_printf(m, "histogram_time_ssch_to_irq ");
964 dasd_stats_array(m, data->dasd_io_time2);
965 seq_printf(m, "histogram_time_ssch_to_irq_weighted ");
966 dasd_stats_array(m, data->dasd_io_time2ps);
967 seq_printf(m, "histogram_time_irq_to_end ");
968 dasd_stats_array(m, data->dasd_io_time3);
969 seq_printf(m, "histogram_ccw_queue_length ");
970 dasd_stats_array(m, data->dasd_io_nr_req);
971 seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs);
972 seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects);
973 seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias);
974 seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm);
975 seq_printf(m, "histogram_read_sectors ");
976 dasd_stats_array(m, data->dasd_read_secs);
977 seq_printf(m, "histogram_read_times ");
978 dasd_stats_array(m, data->dasd_read_times);
979 seq_printf(m, "histogram_read_time_build_to_ssch ");
980 dasd_stats_array(m, data->dasd_read_time1);
981 seq_printf(m, "histogram_read_time_ssch_to_irq ");
982 dasd_stats_array(m, data->dasd_read_time2);
983 seq_printf(m, "histogram_read_time_irq_to_end ");
984 dasd_stats_array(m, data->dasd_read_time3);
985 seq_printf(m, "histogram_read_ccw_queue_length ");
986 dasd_stats_array(m, data->dasd_read_nr_req);
987}
988
989static int dasd_stats_show(struct seq_file *m, void *v)
990{
991 struct dasd_profile *profile;
992 struct dasd_profile_info *data;
993
994 profile = m->private;
995 spin_lock_bh(&profile->lock);
996 data = profile->data;
997 if (!data) {
998 spin_unlock_bh(&profile->lock);
999 seq_printf(m, "disabled\n");
1000 return 0;
1001 }
1002 dasd_stats_seq_print(m, data);
1003 spin_unlock_bh(&profile->lock);
1004 return 0;
1005}
1006
1007static int dasd_stats_open(struct inode *inode, struct file *file)
1008{
1009 struct dasd_profile *profile = inode->i_private;
1010 return single_open(file, dasd_stats_show, profile);
1011}
1012
1013static const struct file_operations dasd_stats_raw_fops = {
1014 .owner = THIS_MODULE,
1015 .open = dasd_stats_open,
1016 .read = seq_read,
1017 .llseek = seq_lseek,
1018 .release = single_release,
1019 .write = dasd_stats_write,
1020};
1021
1022static ssize_t dasd_stats_global_write(struct file *file,
1023 const char __user *user_buf,
1024 size_t user_len, loff_t *pos)
1025{
1026 char *buffer, *str;
1027 ssize_t rc;
1028
1029 if (user_len > 65536)
1030 user_len = 65536;
1031 buffer = dasd_get_user_string(user_buf, user_len);
1032 if (IS_ERR(buffer))
1033 return PTR_ERR(buffer);
1034 str = skip_spaces(buffer);
1035 rc = user_len;
1036 if (strncmp(str, "reset", 5) == 0) {
1037 dasd_global_profile_reset();
1038 } else if (strncmp(str, "on", 2) == 0) {
1039 dasd_global_profile_reset();
1040 dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY;
1041 } else if (strncmp(str, "off", 3) == 0) {
1042 dasd_global_profile_level = DASD_PROFILE_OFF;
1043 } else
1044 rc = -EINVAL;
1045 kfree(buffer);
1046 return rc;
1047}
1048
1049static int dasd_stats_global_show(struct seq_file *m, void *v)
1050{
1051 if (!dasd_global_profile_level) {
1052 seq_printf(m, "disabled\n");
1053 return 0;
1054 }
1055 dasd_stats_seq_print(m, &dasd_global_profile_data);
1056 return 0;
1057}
1058
1059static int dasd_stats_global_open(struct inode *inode, struct file *file)
1060{
1061 return single_open(file, dasd_stats_global_show, NULL);
1062}
1063
1064static const struct file_operations dasd_stats_global_fops = {
1065 .owner = THIS_MODULE,
1066 .open = dasd_stats_global_open,
1067 .read = seq_read,
1068 .llseek = seq_lseek,
1069 .release = single_release,
1070 .write = dasd_stats_global_write,
1071};
1072
1073static void dasd_profile_init(struct dasd_profile *profile,
1074 struct dentry *base_dentry)
1075{
1076 mode_t mode;
1077 struct dentry *pde;
1078
1079 if (!base_dentry)
1080 return;
1081 profile->dentry = NULL;
1082 profile->data = NULL;
1083 mode = (S_IRUSR | S_IWUSR | S_IFREG);
1084 pde = debugfs_create_file("statistics", mode, base_dentry,
1085 profile, &dasd_stats_raw_fops);
1086 if (pde && !IS_ERR(pde))
1087 profile->dentry = pde;
1088 return;
1089}
1090
1091static void dasd_profile_exit(struct dasd_profile *profile)
1092{
1093 dasd_profile_off(profile);
1094 if (profile->dentry) {
1095 debugfs_remove(profile->dentry);
1096 profile->dentry = NULL;
1097 }
1098}
1099
1100static void dasd_statistics_removeroot(void)
1101{
1102 dasd_global_profile_level = DASD_PROFILE_OFF;
1103 if (dasd_global_profile_dentry) {
1104 debugfs_remove(dasd_global_profile_dentry);
1105 dasd_global_profile_dentry = NULL;
1106 }
1107 if (dasd_debugfs_global_entry)
1108 debugfs_remove(dasd_debugfs_global_entry);
1109 if (dasd_debugfs_root_entry)
1110 debugfs_remove(dasd_debugfs_root_entry);
1111}
1112
1113static void dasd_statistics_createroot(void)
1114{
1115 mode_t mode;
1116 struct dentry *pde;
1117
1118 dasd_debugfs_root_entry = NULL;
1119 dasd_debugfs_global_entry = NULL;
1120 dasd_global_profile_dentry = NULL;
1121 pde = debugfs_create_dir("dasd", NULL);
1122 if (!pde || IS_ERR(pde))
1123 goto error;
1124 dasd_debugfs_root_entry = pde;
1125 pde = debugfs_create_dir("global", dasd_debugfs_root_entry);
1126 if (!pde || IS_ERR(pde))
1127 goto error;
1128 dasd_debugfs_global_entry = pde;
1129
1130 mode = (S_IRUSR | S_IWUSR | S_IFREG);
1131 pde = debugfs_create_file("statistics", mode, dasd_debugfs_global_entry,
1132 NULL, &dasd_stats_global_fops);
1133 if (!pde || IS_ERR(pde))
1134 goto error;
1135 dasd_global_profile_dentry = pde;
1136 return;
1137
1138error:
1139 DBF_EVENT(DBF_ERR, "%s",
1140 "Creation of the dasd debugfs interface failed");
1141 dasd_statistics_removeroot();
1142 return;
1143}
1144
1da177e4 1145#else
8e09f215
SW		 1146#define dasd_profile_start(block, cqr, req) do {} while (0)
1147#define dasd_profile_end(block, cqr, req) do {} while (0)
4fa52aa7
SW		 1148
1149static void dasd_statistics_createroot(void)
1150{
1151 return;
1152}
1153
1154static void dasd_statistics_removeroot(void)
1155{
1156 return;
1157}
1158
1159int dasd_stats_generic_show(struct seq_file *m, void *v)
1160{
1161 seq_printf(m, "Statistics are not activated in this kernel\n");
1162 return 0;
1163}
1164
1165static void dasd_profile_init(struct dasd_profile *profile,
1166 struct dentry *base_dentry)
1167{
1168 return;
1169}
1170
1171static void dasd_profile_exit(struct dasd_profile *profile)
1172{
1173 return;
1174}
1175
1176int dasd_profile_on(struct dasd_profile *profile)
1177{
1178 return 0;
1179}
1180
1da177e4
LT		 1181#endif /* CONFIG_DASD_PROFILE */
1182
1183/*
1184 * Allocate memory for a channel program with 'cplength' channel
1185 * command words and 'datasize' additional space. There are two
1186 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
1187 * memory and 2) dasd_smalloc_request uses the static ccw memory
1188 * that gets allocated for each device.
1189 */
68b781fe 1190struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
8e09f215
SW		 1191 int datasize,
1192 struct dasd_device *device)
1da177e4
LT		 1193{
1194 struct dasd_ccw_req *cqr;
1195
1196 /* Sanity checks */
68b781fe 1197 BUG_ON(datasize > PAGE_SIZE ||
7ac1e877 1198 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
1da177e4 1199
88abaab4 1200 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
1da177e4
LT		 1201 if (cqr == NULL)
1202 return ERR_PTR(-ENOMEM);
1da177e4
LT		 1203 cqr->cpaddr = NULL;
1204 if (cplength > 0) {
88abaab4 1205 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
1da177e4
LT		 1206 GFP_ATOMIC | GFP_DMA);
1207 if (cqr->cpaddr == NULL) {
1208 kfree(cqr);
1209 return ERR_PTR(-ENOMEM);
1210 }
1da177e4
LT		 1211 }
1212 cqr->data = NULL;
1213 if (datasize > 0) {
88abaab4 1214 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
1da177e4 1215 if (cqr->data == NULL) {
17fd682e 1216 kfree(cqr->cpaddr);
1da177e4
LT		 1217 kfree(cqr);
1218 return ERR_PTR(-ENOMEM);
1219 }
1da177e4 1220 }
68b781fe 1221 cqr->magic = magic;
1da177e4
LT		 1222 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1223 dasd_get_device(device);
1224 return cqr;
1225}
1226
68b781fe 1227struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
8e09f215
SW		 1228 int datasize,
1229 struct dasd_device *device)
1da177e4
LT		 1230{
1231 unsigned long flags;
1232 struct dasd_ccw_req *cqr;
1233 char *data;
1234 int size;
1235
1da177e4
LT		 1236 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
1237 if (cplength > 0)
1238 size += cplength * sizeof(struct ccw1);
1239 if (datasize > 0)
1240 size += datasize;
1241 spin_lock_irqsave(&device->mem_lock, flags);
1242 cqr = (struct dasd_ccw_req *)
1243 dasd_alloc_chunk(&device->ccw_chunks, size);
1244 spin_unlock_irqrestore(&device->mem_lock, flags);
1245 if (cqr == NULL)
1246 return ERR_PTR(-ENOMEM);
1247 memset(cqr, 0, sizeof(struct dasd_ccw_req));
1248 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
1249 cqr->cpaddr = NULL;
1250 if (cplength > 0) {
1251 cqr->cpaddr = (struct ccw1 *) data;
1252 data += cplength*sizeof(struct ccw1);
1253 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
1254 }
1255 cqr->data = NULL;
1256 if (datasize > 0) {
1257 cqr->data = data;
1258 memset(cqr->data, 0, datasize);
1259 }
68b781fe 1260 cqr->magic = magic;
1da177e4
LT		 1261 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1262 dasd_get_device(device);
1263 return cqr;
1264}
1265
1266/*
1267 * Free memory of a channel program. This function needs to free all the
1268 * idal lists that might have been created by dasd_set_cda and the
1269 * struct dasd_ccw_req itself.
1270 */
8e09f215 1271void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1da177e4 1272{
347a8dc3 1273#ifdef CONFIG_64BIT
1da177e4
LT		 1274 struct ccw1 *ccw;
1275
1276 /* Clear any idals used for the request. */
1277 ccw = cqr->cpaddr;
1278 do {
1279 clear_normalized_cda(ccw);
1280 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
1281#endif
17fd682e
JJ		 1282 kfree(cqr->cpaddr);
1283 kfree(cqr->data);
1da177e4
LT		 1284 kfree(cqr);
1285 dasd_put_device(device);
1286}
1287
8e09f215 1288void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1da177e4
LT		 1289{
1290 unsigned long flags;
1291
1292 spin_lock_irqsave(&device->mem_lock, flags);
1293 dasd_free_chunk(&device->ccw_chunks, cqr);
1294 spin_unlock_irqrestore(&device->mem_lock, flags);
1295 dasd_put_device(device);
1296}
1297
1298/*
1299 * Check discipline magic in cqr.
1300 */
8e09f215 1301static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
1da177e4
LT		 1302{
1303 struct dasd_device *device;
1304
1305 if (cqr == NULL)
1306 return -EINVAL;
8e09f215 1307 device = cqr->startdev;
1da177e4 1308 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
fc19f381 1309 DBF_DEV_EVENT(DBF_WARNING, device,
1da177e4
LT		 1310 " dasd_ccw_req 0x%08x magic doesn't match"
1311 " discipline 0x%08x",
1312 cqr->magic,
1313 *(unsigned int *) device->discipline->name);
1314 return -EINVAL;
1315 }
1316 return 0;
1317}
1318
1319/*
1320 * Terminate the current i/o and set the request to clear_pending.
1321 * Timer keeps device runnig.
1322 * ccw_device_clear can fail if the i/o subsystem
1323 * is in a bad mood.
1324 */
8e09f215 1325int dasd_term_IO(struct dasd_ccw_req *cqr)
1da177e4
LT		 1326{
1327 struct dasd_device *device;
1328 int retries, rc;
fc19f381 1329 char errorstring[ERRORLENGTH];
1da177e4
LT		 1330
1331 /* Check the cqr */
1332 rc = dasd_check_cqr(cqr);
1333 if (rc)
1334 return rc;
1335 retries = 0;
8e09f215 1336 device = (struct dasd_device *) cqr->startdev;
1da177e4
LT		 1337 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
1338 rc = ccw_device_clear(device->cdev, (long) cqr);
1339 switch (rc) {
1340 case 0: /* termination successful */
8e09f215 1341 cqr->status = DASD_CQR_CLEAR_PENDING;
1da177e4 1342 cqr->stopclk = get_clock();
8f61701b 1343 cqr->starttime = 0;
1da177e4
LT		 1344 DBF_DEV_EVENT(DBF_DEBUG, device,
1345 "terminate cqr %p successful",
1346 cqr);
1347 break;
1348 case -ENODEV:
1349 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1350 "device gone, retry");
1351 break;
1352 case -EIO:
1353 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1354 "I/O error, retry");
1355 break;
1356 case -EINVAL:
1357 case -EBUSY:
1358 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1359 "device busy, retry later");
1360 break;
1361 default:
fc19f381
SH		 1362 /* internal error 10 - unknown rc*/
1363 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
1364 dev_err(&device->cdev->dev, "An error occurred in the "
1365 "DASD device driver, reason=%s\n", errorstring);
1da177e4
LT		 1366 BUG();
1367 break;
1368 }
1369 retries++;
1370 }
8e09f215 1371 dasd_schedule_device_bh(device);
1da177e4
LT		 1372 return rc;
1373}
1374
1375/*
1376 * Start the i/o. This start_IO can fail if the channel is really busy.
1377 * In that case set up a timer to start the request later.
1378 */
8e09f215 1379int dasd_start_IO(struct dasd_ccw_req *cqr)
1da177e4
LT		 1380{
1381 struct dasd_device *device;
1382 int rc;
fc19f381 1383 char errorstring[ERRORLENGTH];
1da177e4
LT		 1384
1385 /* Check the cqr */
1386 rc = dasd_check_cqr(cqr);
6cc7f168
SW		 1387 if (rc) {
1388 cqr->intrc = rc;
1da177e4 1389 return rc;
6cc7f168 1390 }
8e09f215 1391 device = (struct dasd_device *) cqr->startdev;
5a27e60d
SW		 1392 if (((cqr->block &&
1393 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) ||
1394 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) &&
1395 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1396 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p "
1397 "because of stolen lock", cqr);
1398 cqr->status = DASD_CQR_ERROR;
1399 cqr->intrc = -EPERM;
1400 return -EPERM;
1401 }
1da177e4 1402 if (cqr->retries < 0) {
fc19f381
SH		 1403 /* internal error 14 - start_IO run out of retries */
1404 sprintf(errorstring, "14 %p", cqr);
1405 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1406 "device driver, reason=%s\n", errorstring);
8e09f215 1407 cqr->status = DASD_CQR_ERROR;
1da177e4
LT		 1408 return -EIO;
1409 }
1410 cqr->startclk = get_clock();
1411 cqr->starttime = jiffies;
1412 cqr->retries--;
a4d26c6a
SW		 1413 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1414 cqr->lpm &= device->path_data.opm;
1415 if (!cqr->lpm)
1416 cqr->lpm = device->path_data.opm;
1417 }
f3eb5384
SW		 1418 if (cqr->cpmode == 1) {
1419 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
1420 (long) cqr, cqr->lpm);
1421 } else {
1422 rc = ccw_device_start(device->cdev, cqr->cpaddr,
1423 (long) cqr, cqr->lpm, 0);
1424 }
1da177e4
LT		 1425 switch (rc) {
1426 case 0:
1427 cqr->status = DASD_CQR_IN_IO;
1da177e4
LT		 1428 break;
1429 case -EBUSY:
a4d26c6a 1430 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1da177e4
LT		 1431 "start_IO: device busy, retry later");
1432 break;
1433 case -ETIMEDOUT:
a4d26c6a 1434 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1da177e4
LT		 1435 "start_IO: request timeout, retry later");
1436 break;
1437 case -EACCES:
a4d26c6a
SW		 1438 /* -EACCES indicates that the request used only a subset of the
1439 * available paths and all these paths are gone. If the lpm of
1440 * this request was only a subset of the opm (e.g. the ppm) then
1441 * we just do a retry with all available paths.
1442 * If we already use the full opm, something is amiss, and we
1443 * need a full path verification.
1da177e4 1444 */
a4d26c6a
SW		 1445 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1446 DBF_DEV_EVENT(DBF_WARNING, device,
1447 "start_IO: selected paths gone (%x)",
1448 cqr->lpm);
1449 } else if (cqr->lpm != device->path_data.opm) {
1450 cqr->lpm = device->path_data.opm;
1451 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
1452 "start_IO: selected paths gone,"
1453 " retry on all paths");
1454 } else {
1455 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1456 "start_IO: all paths in opm gone,"
1457 " do path verification");
1458 dasd_generic_last_path_gone(device);
1459 device->path_data.opm = 0;
1460 device->path_data.ppm = 0;
1461 device->path_data.npm = 0;
1462 device->path_data.tbvpm =
1463 ccw_device_get_path_mask(device->cdev);
1464 }
1da177e4
LT		 1465 break;
1466 case -ENODEV:
a4d26c6a 1467 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
f3eb5384
SW		 1468 "start_IO: -ENODEV device gone, retry");
1469 break;
1da177e4 1470 case -EIO:
a4d26c6a 1471 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
f3eb5384 1472 "start_IO: -EIO device gone, retry");
1da177e4 1473 break;
d41dd122
SH		 1474 case -EINVAL:
1475 /* most likely caused in power management context */
a4d26c6a 1476 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
d41dd122
SH		 1477 "start_IO: -EINVAL device currently "
1478 "not accessible");
1479 break;
1da177e4 1480 default:
fc19f381
SH		 1481 /* internal error 11 - unknown rc */
1482 snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
1483 dev_err(&device->cdev->dev,
1484 "An error occurred in the DASD device driver, "
1485 "reason=%s\n", errorstring);
1da177e4
LT		 1486 BUG();
1487 break;
1488 }
6cc7f168 1489 cqr->intrc = rc;
1da177e4
LT		 1490 return rc;
1491}
1492
1493/*
1494 * Timeout function for dasd devices. This is used for different purposes
1495 * 1) missing interrupt handler for normal operation
1496 * 2) delayed start of request where start_IO failed with -EBUSY
1497 * 3) timeout for missing state change interrupts
1498 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
1499 * DASD_CQR_QUEUED for 2) and 3).
1500 */
8e09f215 1501static void dasd_device_timeout(unsigned long ptr)
1da177e4
LT		 1502{
1503 unsigned long flags;
1504 struct dasd_device *device;
1505
1506 device = (struct dasd_device *) ptr;
1507 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1508 /* re-activate request queue */
eb6e199b 1509 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1da177e4 1510 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
8e09f215 1511 dasd_schedule_device_bh(device);
1da177e4
LT		 1512}
1513
1514/*
1515 * Setup timeout for a device in jiffies.
1516 */
8e09f215 1517void dasd_device_set_timer(struct dasd_device *device, int expires)
1da177e4 1518{
48cae885
SW		 1519 if (expires == 0)
1520 del_timer(&device->timer);
1521 else
1522 mod_timer(&device->timer, jiffies + expires);
1da177e4
LT		 1523}
1524
1525/*
1526 * Clear timeout for a device.
1527 */
8e09f215 1528void dasd_device_clear_timer(struct dasd_device *device)
1da177e4 1529{
48cae885 1530 del_timer(&device->timer);
1da177e4
LT		 1531}
1532
8e09f215
SW		 1533static void dasd_handle_killed_request(struct ccw_device *cdev,
1534 unsigned long intparm)
1da177e4
LT		 1535{
1536 struct dasd_ccw_req *cqr;
1537 struct dasd_device *device;
1538
f16f5843
SW		 1539 if (!intparm)
1540 return;
1da177e4
LT		 1541 cqr = (struct dasd_ccw_req *) intparm;
1542 if (cqr->status != DASD_CQR_IN_IO) {
b8ed5dd5
SH		 1543 DBF_EVENT_DEVID(DBF_DEBUG, cdev,
1544 "invalid status in handle_killed_request: "
1545 "%02x", cqr->status);
1da177e4
LT		 1546 return;
1547 }
1548
589c74d5
SH		 1549 device = dasd_device_from_cdev_locked(cdev);
1550 if (IS_ERR(device)) {
1551 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1552 "unable to get device from cdev");
1553 return;
1554 }
1555
1556 if (!cqr->startdev ||
1557 device != cqr->startdev ||
1558 strncmp(cqr->startdev->discipline->ebcname,
1559 (char *) &cqr->magic, 4)) {
294001a8
SH		 1560 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1561 "invalid device in request");
589c74d5 1562 dasd_put_device(device);
1da177e4
LT		 1563 return;
1564 }
1565
1566 /* Schedule request to be retried. */
1567 cqr->status = DASD_CQR_QUEUED;
1568
8e09f215
SW		 1569 dasd_device_clear_timer(device);
1570 dasd_schedule_device_bh(device);
1da177e4
LT		 1571 dasd_put_device(device);
1572}
1573
8e09f215 1574void dasd_generic_handle_state_change(struct dasd_device *device)
1da177e4 1575{
20c64468
SW		 1576 /* First of all start sense subsystem status request. */
1577 dasd_eer_snss(device);
1578
eb6e199b 1579 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
8e09f215
SW		 1580 dasd_schedule_device_bh(device);
1581 if (device->block)
1582 dasd_schedule_block_bh(device->block);
1da177e4
LT		 1583}
1584
1585/*
1586 * Interrupt handler for "normal" ssch-io based dasd devices.
1587 */
8e09f215
SW		 1588void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1589 struct irb *irb)
1da177e4
LT		 1590{
1591 struct dasd_ccw_req *cqr, *next;
1592 struct dasd_device *device;
1593 unsigned long long now;
1594 int expires;
1da177e4 1595
3283942b 1596 kstat_cpu(smp_processor_id()).irqs[IOINT_DAS]++;
1da177e4
LT		 1597 if (IS_ERR(irb)) {
1598 switch (PTR_ERR(irb)) {
1599 case -EIO:
1da177e4
LT		 1600 break;
1601 case -ETIMEDOUT:
b8ed5dd5
SH		 1602 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1603 "request timed out\n", __func__);
1da177e4
LT		 1604 break;
1605 default:
b8ed5dd5
SH		 1606 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1607 "unknown error %ld\n", __func__,
1608 PTR_ERR(irb));
1da177e4 1609 }
f16f5843 1610 dasd_handle_killed_request(cdev, intparm);
1da177e4
LT		 1611 return;
1612 }
1613
1614 now = get_clock();
8e09f215 1615 cqr = (struct dasd_ccw_req *) intparm;
5a27e60d
SW		 1616 /* check for conditions that should be handled immediately */
1617 if (!cqr ||
1618 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1619 scsw_cstat(&irb->scsw) == 0)) {
a5a0061f
SW		 1620 if (cqr)
1621 memcpy(&cqr->irb, irb, sizeof(*irb));
a00bfd71 1622 device = dasd_device_from_cdev_locked(cdev);
56b86b61
SH		 1623 if (IS_ERR(device))
1624 return;
1625 /* ignore unsolicited interrupts for DIAG discipline */
1626 if (device->discipline == dasd_diag_discipline_pointer) {
1da177e4 1627 dasd_put_device(device);
56b86b61 1628 return;
1da177e4 1629 }
5a27e60d
SW		 1630 device->discipline->dump_sense_dbf(device, irb, "int");
1631 if (device->features & DASD_FEATURE_ERPLOG)
1632 device->discipline->dump_sense(device, cqr, irb);
1633 device->discipline->check_for_device_change(device, cqr, irb);
56b86b61 1634 dasd_put_device(device);
1da177e4 1635 }
5a27e60d
SW		 1636 if (!cqr)
1637 return;
1da177e4 1638
8e09f215
SW		 1639 device = (struct dasd_device *) cqr->startdev;
1640 if (!device ||
1da177e4 1641 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
294001a8
SH		 1642 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1643 "invalid device in request");
1da177e4
LT		 1644 return;
1645 }
1646
1647 /* Check for clear pending */
8e09f215 1648 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
f3eb5384 1649 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
8e09f215
SW		 1650 cqr->status = DASD_CQR_CLEARED;
1651 dasd_device_clear_timer(device);
8f61701b 1652 wake_up(&dasd_flush_wq);
8e09f215 1653 dasd_schedule_device_bh(device);
1da177e4
LT		 1654 return;
1655 }
1656
f3eb5384 1657 /* check status - the request might have been killed by dyn detach */
1da177e4 1658 if (cqr->status != DASD_CQR_IN_IO) {
fc19f381
SH		 1659 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1660 "status %02x", dev_name(&cdev->dev), cqr->status);
1da177e4
LT		 1661 return;
1662 }
fc19f381 1663
8e09f215 1664 next = NULL;
1da177e4 1665 expires = 0;
f3eb5384
SW		 1666 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1667 scsw_cstat(&irb->scsw) == 0) {
8e09f215
SW		 1668 /* request was completed successfully */
1669 cqr->status = DASD_CQR_SUCCESS;
1da177e4
LT		 1670 cqr->stopclk = now;
1671 /* Start first request on queue if possible -> fast_io. */
8e09f215
SW		 1672 if (cqr->devlist.next != &device->ccw_queue) {
1673 next = list_entry(cqr->devlist.next,
1674 struct dasd_ccw_req, devlist);
1da177e4 1675 }
8e09f215 1676 } else { /* error */
6c5f57c7
SH		 1677 /*
1678 * If we don't want complex ERP for this request, then just
1679 * reset this and retry it in the fastpath
8e09f215 1680 */
6c5f57c7 1681 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
8e09f215 1682 cqr->retries > 0) {
a4d26c6a 1683 if (cqr->lpm == device->path_data.opm)
fc19f381
SH		 1684 DBF_DEV_EVENT(DBF_DEBUG, device,
1685 "default ERP in fastpath "
1686 "(%i retries left)",
1687 cqr->retries);
a4d26c6a
SW		 1688 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
1689 cqr->lpm = device->path_data.opm;
8e09f215
SW		 1690 cqr->status = DASD_CQR_QUEUED;
1691 next = cqr;
1692 } else
1da177e4 1693 cqr->status = DASD_CQR_ERROR;
8e09f215
SW		 1694 }
1695 if (next && (next->status == DASD_CQR_QUEUED) &&
1696 (!device->stopped)) {
1697 if (device->discipline->start_IO(next) == 0)
1698 expires = next->expires;
1da177e4
LT		 1699 }
1700 if (expires != 0)
8e09f215 1701 dasd_device_set_timer(device, expires);
1da177e4 1702 else
8e09f215
SW		 1703 dasd_device_clear_timer(device);
1704 dasd_schedule_device_bh(device);
1da177e4
LT		 1705}
1706
a23ed009
SH		 1707enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
1708{
1709 struct dasd_device *device;
1710
1711 device = dasd_device_from_cdev_locked(cdev);
1712
1713 if (IS_ERR(device))
1714 goto out;
1715 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1716 device->state != device->target ||
5a27e60d 1717 !device->discipline->check_for_device_change){
a23ed009
SH		 1718 dasd_put_device(device);
1719 goto out;
1720 }
5a27e60d
SW		 1721 if (device->discipline->dump_sense_dbf)
1722 device->discipline->dump_sense_dbf(device, irb, "uc");
1723 device->discipline->check_for_device_change(device, NULL, irb);
a23ed009
SH		 1724 dasd_put_device(device);
1725out:
1726 return UC_TODO_RETRY;
1727}
1728EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
1729
1da177e4 1730/*
8e09f215
SW		 1731 * If we have an error on a dasd_block layer request then we cancel
1732 * and return all further requests from the same dasd_block as well.
1da177e4 1733 */
8e09f215
SW		 1734static void __dasd_device_recovery(struct dasd_device *device,
1735 struct dasd_ccw_req *ref_cqr)
1da177e4 1736{
8e09f215
SW		 1737 struct list_head *l, *n;
1738 struct dasd_ccw_req *cqr;
1da177e4 1739
8e09f215
SW		 1740 /*
1741 * only requeue request that came from the dasd_block layer
1742 */
1743 if (!ref_cqr->block)
1744 return;
1da177e4 1745
8e09f215
SW		 1746 list_for_each_safe(l, n, &device->ccw_queue) {
1747 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1748 if (cqr->status == DASD_CQR_QUEUED &&
1749 ref_cqr->block == cqr->block) {
1750 cqr->status = DASD_CQR_CLEARED;
1751 }
1752 }
1753};
1da177e4
LT		 1754
1755/*
8e09f215
SW		 1756 * Remove those ccw requests from the queue that need to be returned
1757 * to the upper layer.
1da177e4 1758 */
8e09f215
SW		 1759static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1760 struct list_head *final_queue)
1da177e4
LT		 1761{
1762 struct list_head *l, *n;
1763 struct dasd_ccw_req *cqr;
1da177e4 1764
1da177e4
LT		 1765 /* Process request with final status. */
1766 list_for_each_safe(l, n, &device->ccw_queue) {
8e09f215
SW		 1767 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1768
1da177e4 1769 /* Stop list processing at the first non-final request. */
8e09f215
SW		 1770 if (cqr->status == DASD_CQR_QUEUED ||
1771 cqr->status == DASD_CQR_IN_IO ||
1772 cqr->status == DASD_CQR_CLEAR_PENDING)
1da177e4 1773 break;
1da177e4 1774 if (cqr->status == DASD_CQR_ERROR) {
8e09f215 1775 __dasd_device_recovery(device, cqr);
20c64468 1776 }
1da177e4 1777 /* Rechain finished requests to final queue */
8e09f215 1778 list_move_tail(&cqr->devlist, final_queue);
1da177e4
LT		 1779 }
1780}
1781
1da177e4 1782/*
8e09f215
SW		 1783 * the cqrs from the final queue are returned to the upper layer
1784 * by setting a dasd_block state and calling the callback function
1da177e4 1785 */
8e09f215
SW		 1786static void __dasd_device_process_final_queue(struct dasd_device *device,
1787 struct list_head *final_queue)
1da177e4 1788{
8e09f215 1789 struct list_head *l, *n;
1da177e4 1790 struct dasd_ccw_req *cqr;
03513bcc 1791 struct dasd_block *block;
c80ee724
SH		 1792 void (*callback)(struct dasd_ccw_req *, void *data);
1793 void *callback_data;
fc19f381 1794 char errorstring[ERRORLENGTH];
f24acd45 1795
8e09f215
SW		 1796 list_for_each_safe(l, n, final_queue) {
1797 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1798 list_del_init(&cqr->devlist);
03513bcc 1799 block = cqr->block;
c80ee724
SH		 1800 callback = cqr->callback;
1801 callback_data = cqr->callback_data;
03513bcc
SW		 1802 if (block)
1803 spin_lock_bh(&block->queue_lock);
8e09f215
SW		 1804 switch (cqr->status) {
1805 case DASD_CQR_SUCCESS:
1806 cqr->status = DASD_CQR_DONE;
1807 break;
1808 case DASD_CQR_ERROR:
1809 cqr->status = DASD_CQR_NEED_ERP;
1810 break;
1811 case DASD_CQR_CLEARED:
1812 cqr->status = DASD_CQR_TERMINATED;
1813 break;
1814 default:
fc19f381
SH		 1815 /* internal error 12 - wrong cqr status*/
1816 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1817 dev_err(&device->cdev->dev,
1818 "An error occurred in the DASD device driver, "
1819 "reason=%s\n", errorstring);
8e09f215 1820 BUG();
1da177e4 1821 }
8e09f215 1822 if (cqr->callback != NULL)
c80ee724 1823 (callback)(cqr, callback_data);
03513bcc
SW		 1824 if (block)
1825 spin_unlock_bh(&block->queue_lock);
1da177e4
LT		 1826 }
1827}
1828
1829/*
1830 * Take a look at the first request on the ccw queue and check
1831 * if it reached its expire time. If so, terminate the IO.
1832 */
8e09f215 1833static void __dasd_device_check_expire(struct dasd_device *device)
1da177e4
LT		 1834{
1835 struct dasd_ccw_req *cqr;
1836
1837 if (list_empty(&device->ccw_queue))
1838 return;
8e09f215 1839 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
29145a6c
HH		 1840 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1841 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
1842 if (device->discipline->term_IO(cqr) != 0) {
1843 /* Hmpf, try again in 5 sec */
fc19f381 1844 dev_err(&device->cdev->dev,
625c94df 1845 "cqr %p timed out (%lus) but cannot be "
fc19f381
SH		 1846 "ended, retrying in 5 s\n",
1847 cqr, (cqr->expires/HZ));
7dc1da9f
SH		 1848 cqr->expires += 5*HZ;
1849 dasd_device_set_timer(device, 5*HZ);
29145a6c 1850 } else {
fc19f381 1851 dev_err(&device->cdev->dev,
625c94df 1852 "cqr %p timed out (%lus), %i retries "
fc19f381
SH		 1853 "remaining\n", cqr, (cqr->expires/HZ),
1854 cqr->retries);
1da177e4
LT		 1855 }
1856 }
1857}
1858
1859/*
1860 * Take a look at the first request on the ccw queue and check
1861 * if it needs to be started.
1862 */
8e09f215 1863static void __dasd_device_start_head(struct dasd_device *device)
1da177e4
LT		 1864{
1865 struct dasd_ccw_req *cqr;
1866 int rc;
1867
1868 if (list_empty(&device->ccw_queue))
1869 return;
8e09f215 1870 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
25ee4cf8
PO		 1871 if (cqr->status != DASD_CQR_QUEUED)
1872 return;
a4d26c6a
SW		 1873 /* when device is stopped, return request to previous layer
1874 * exception: only the disconnect or unresumed bits are set and the
1875 * cqr is a path verification request
1876 */
1877 if (device->stopped &&
1878 !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
1879 && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) {
1880 cqr->intrc = -EAGAIN;
8e09f215
SW		 1881 cqr->status = DASD_CQR_CLEARED;
1882 dasd_schedule_device_bh(device);
25ee4cf8 1883 return;
1c01b8a5 1884 }
25ee4cf8
PO		 1885
1886 rc = device->discipline->start_IO(cqr);
1887 if (rc == 0)
8e09f215 1888 dasd_device_set_timer(device, cqr->expires);
25ee4cf8 1889 else if (rc == -EACCES) {
8e09f215 1890 dasd_schedule_device_bh(device);
25ee4cf8
PO		 1891 } else
1892 /* Hmpf, try again in 1/2 sec */
8e09f215 1893 dasd_device_set_timer(device, 50);
8f61701b
HH		 1894}
1895
a4d26c6a
SW		 1896static void __dasd_device_check_path_events(struct dasd_device *device)
1897{
1898 int rc;
1899
1900 if (device->path_data.tbvpm) {
1901 if (device->stopped & ~(DASD_STOPPED_DC_WAIT |
1902 DASD_UNRESUMED_PM))
1903 return;
1904 rc = device->discipline->verify_path(
1905 device, device->path_data.tbvpm);
1906 if (rc)
1907 dasd_device_set_timer(device, 50);
1908 else
1909 device->path_data.tbvpm = 0;
1910 }
1911};
1912
1da177e4 1913/*
8e09f215
SW		 1914 * Go through all request on the dasd_device request queue,
1915 * terminate them on the cdev if necessary, and return them to the
1916 * submitting layer via callback.
1917 * Note:
1918 * Make sure that all 'submitting layers' still exist when
1919 * this function is called!. In other words, when 'device' is a base
1920 * device then all block layer requests must have been removed before
1921 * via dasd_flush_block_queue.
1da177e4 1922 */
8e09f215 1923int dasd_flush_device_queue(struct dasd_device *device)
1da177e4 1924{
8e09f215
SW		 1925 struct dasd_ccw_req *cqr, *n;
1926 int rc;
1da177e4 1927 struct list_head flush_queue;
1da177e4
LT		 1928
1929 INIT_LIST_HEAD(&flush_queue);
1930 spin_lock_irq(get_ccwdev_lock(device->cdev));
8f61701b 1931 rc = 0;
8e09f215 1932 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
8f61701b
HH		 1933 /* Check status and move request to flush_queue */
1934 switch (cqr->status) {
1935 case DASD_CQR_IN_IO:
1936 rc = device->discipline->term_IO(cqr);
1937 if (rc) {
1938 /* unable to terminate requeust */
fc19f381
SH		 1939 dev_err(&device->cdev->dev,
1940 "Flushing the DASD request queue "
1941 "failed for request %p\n", cqr);
8f61701b
HH		 1942 /* stop flush processing */
1943 goto finished;
1944 }
1945 break;
1946 case DASD_CQR_QUEUED:
1da177e4 1947 cqr->stopclk = get_clock();
8e09f215 1948 cqr->status = DASD_CQR_CLEARED;
8f61701b 1949 break;
8e09f215 1950 default: /* no need to modify the others */
8f61701b
HH		 1951 break;
1952 }
8e09f215 1953 list_move_tail(&cqr->devlist, &flush_queue);
8f61701b 1954 }
8f61701b
HH		 1955finished:
1956 spin_unlock_irq(get_ccwdev_lock(device->cdev));
8e09f215
SW		 1957 /*
1958 * After this point all requests must be in state CLEAR_PENDING,
1959 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
1960 * one of the others.
1961 */
1962 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
1963 wait_event(dasd_flush_wq,
1964 (cqr->status != DASD_CQR_CLEAR_PENDING));
1965 /*
1966 * Now set each request back to TERMINATED, DONE or NEED_ERP
1967 * and call the callback function of flushed requests
1968 */
1969 __dasd_device_process_final_queue(device, &flush_queue);
8f61701b 1970 return rc;
1da177e4
LT		 1971}
1972
1973/*
1974 * Acquire the device lock and process queues for the device.
1975 */
8e09f215 1976static void dasd_device_tasklet(struct dasd_device *device)
1da177e4
LT		 1977{
1978 struct list_head final_queue;
1da177e4
LT		 1979
1980 atomic_set (&device->tasklet_scheduled, 0);
1981 INIT_LIST_HEAD(&final_queue);
1982 spin_lock_irq(get_ccwdev_lock(device->cdev));
1983 /* Check expire time of first request on the ccw queue. */
8e09f215
SW		 1984 __dasd_device_check_expire(device);
1985 /* find final requests on ccw queue */
1986 __dasd_device_process_ccw_queue(device, &final_queue);
a4d26c6a 1987 __dasd_device_check_path_events(device);
1da177e4
LT		 1988 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1989 /* Now call the callback function of requests with final status */
8e09f215
SW		 1990 __dasd_device_process_final_queue(device, &final_queue);
1991 spin_lock_irq(get_ccwdev_lock(device->cdev));
1da177e4 1992 /* Now check if the head of the ccw queue needs to be started. */
8e09f215
SW		 1993 __dasd_device_start_head(device);
1994 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1da177e4
LT		 1995 dasd_put_device(device);
1996}
1997
1998/*
1999 * Schedules a call to dasd_tasklet over the device tasklet.
2000 */
8e09f215 2001void dasd_schedule_device_bh(struct dasd_device *device)
1da177e4
LT		 2002{
2003 /* Protect against rescheduling. */
973bd993 2004 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
1da177e4
LT		 2005 return;
2006 dasd_get_device(device);
2007 tasklet_hi_schedule(&device->tasklet);
2008}
2009
eb6e199b
SW		 2010void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
2011{
2012 device->stopped |= bits;
2013}
2014EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
2015
2016void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
2017{
2018 device->stopped &= ~bits;
2019 if (!device->stopped)
2020 wake_up(&generic_waitq);
2021}
2022EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
2023
1da177e4 2024/*
8e09f215
SW		 2025 * Queue a request to the head of the device ccw_queue.
2026 * Start the I/O if possible.
1da177e4 2027 */
8e09f215 2028void dasd_add_request_head(struct dasd_ccw_req *cqr)
1da177e4
LT		 2029{
2030 struct dasd_device *device;
2031 unsigned long flags;
2032
8e09f215 2033 device = cqr->startdev;
1da177e4 2034 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
8e09f215
SW		 2035 cqr->status = DASD_CQR_QUEUED;
2036 list_add(&cqr->devlist, &device->ccw_queue);
1da177e4 2037 /* let the bh start the request to keep them in order */
8e09f215 2038 dasd_schedule_device_bh(device);
1da177e4
LT		 2039 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2040}
2041
2042/*
8e09f215
SW		 2043 * Queue a request to the tail of the device ccw_queue.
2044 * Start the I/O if possible.
1da177e4 2045 */
8e09f215 2046void dasd_add_request_tail(struct dasd_ccw_req *cqr)
1da177e4
LT		 2047{
2048 struct dasd_device *device;
2049 unsigned long flags;
2050
8e09f215 2051 device = cqr->startdev;
1da177e4 2052 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
8e09f215
SW		 2053 cqr->status = DASD_CQR_QUEUED;
2054 list_add_tail(&cqr->devlist, &device->ccw_queue);
1da177e4 2055 /* let the bh start the request to keep them in order */
8e09f215 2056 dasd_schedule_device_bh(device);
1da177e4
LT		 2057 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2058}
2059
2060/*
8e09f215 2061 * Wakeup helper for the 'sleep_on' functions.
1da177e4 2062 */
8e09f215 2063static void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
1da177e4 2064{
1c1e093c
SW		 2065 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2066 cqr->callback_data = DASD_SLEEPON_END_TAG;
2067 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2068 wake_up(&generic_waitq);
1da177e4
LT		 2069}
2070
8e09f215 2071static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
1da177e4
LT		 2072{
2073 struct dasd_device *device;
2074 int rc;
2075
8e09f215 2076 device = cqr->startdev;
1da177e4 2077 spin_lock_irq(get_ccwdev_lock(device->cdev));
1c1e093c 2078 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
1da177e4
LT		 2079 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2080 return rc;
2081}
2082
2083/*
eb6e199b 2084 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
1da177e4 2085 */
eb6e199b 2086static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
1da177e4 2087{
1da177e4 2088 struct dasd_device *device;
eb6e199b 2089 dasd_erp_fn_t erp_fn;
138c014d 2090
eb6e199b
SW		 2091 if (cqr->status == DASD_CQR_FILLED)
2092 return 0;
8e09f215 2093 device = cqr->startdev;
eb6e199b
SW		 2094 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2095 if (cqr->status == DASD_CQR_TERMINATED) {
2096 device->discipline->handle_terminated_request(cqr);
2097 return 1;
2098 }
2099 if (cqr->status == DASD_CQR_NEED_ERP) {
2100 erp_fn = device->discipline->erp_action(cqr);
2101 erp_fn(cqr);
2102 return 1;
2103 }
2104 if (cqr->status == DASD_CQR_FAILED)
2105 dasd_log_sense(cqr, &cqr->irb);
2106 if (cqr->refers) {
2107 __dasd_process_erp(device, cqr);
2108 return 1;
2109 }
2110 }
2111 return 0;
2112}
138c014d 2113
eb6e199b
SW		 2114static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
2115{
2116 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2117 if (cqr->refers) /* erp is not done yet */
2118 return 1;
2119 return ((cqr->status != DASD_CQR_DONE) &&
2120 (cqr->status != DASD_CQR_FAILED));
2121 } else
2122 return (cqr->status == DASD_CQR_FILLED);
2123}
138c014d 2124
eb6e199b
SW		 2125static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
2126{
2127 struct dasd_device *device;
2128 int rc;
2129 struct list_head ccw_queue;
2130 struct dasd_ccw_req *cqr;
2131
2132 INIT_LIST_HEAD(&ccw_queue);
2133 maincqr->status = DASD_CQR_FILLED;
2134 device = maincqr->startdev;
2135 list_add(&maincqr->blocklist, &ccw_queue);
2136 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
2137 cqr = list_first_entry(&ccw_queue,
2138 struct dasd_ccw_req, blocklist)) {
2139
2140 if (__dasd_sleep_on_erp(cqr))
2141 continue;
2142 if (cqr->status != DASD_CQR_FILLED) /* could be failed */
2143 continue;
5a27e60d
SW		 2144 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2145 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2146 cqr->status = DASD_CQR_FAILED;
2147 cqr->intrc = -EPERM;
2148 continue;
2149 }
eb6e199b
SW		 2150 /* Non-temporary stop condition will trigger fail fast */
2151 if (device->stopped & ~DASD_STOPPED_PENDING &&
2152 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2153 (!dasd_eer_enabled(device))) {
2154 cqr->status = DASD_CQR_FAILED;
2155 continue;
2156 }
eb6e199b
SW		 2157 /* Don't try to start requests if device is stopped */
2158 if (interruptible) {
2159 rc = wait_event_interruptible(
2160 generic_waitq, !(device->stopped));
2161 if (rc == -ERESTARTSYS) {
2162 cqr->status = DASD_CQR_FAILED;
2163 maincqr->intrc = rc;
2164 continue;
2165 }
2166 } else
2167 wait_event(generic_waitq, !(device->stopped));
2168
2169 cqr->callback = dasd_wakeup_cb;
1c1e093c 2170 cqr->callback_data = DASD_SLEEPON_START_TAG;
eb6e199b
SW		 2171 dasd_add_request_tail(cqr);
2172 if (interruptible) {
2173 rc = wait_event_interruptible(
2174 generic_waitq, _wait_for_wakeup(cqr));
2175 if (rc == -ERESTARTSYS) {
2176 dasd_cancel_req(cqr);
2177 /* wait (non-interruptible) for final status */
2178 wait_event(generic_waitq,
2179 _wait_for_wakeup(cqr));
2180 cqr->status = DASD_CQR_FAILED;
2181 maincqr->intrc = rc;
2182 continue;
2183 }
2184 } else
2185 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2186 }
2187
2188 maincqr->endclk = get_clock();
2189 if ((maincqr->status != DASD_CQR_DONE) &&
2190 (maincqr->intrc != -ERESTARTSYS))
2191 dasd_log_sense(maincqr, &maincqr->irb);
2192 if (maincqr->status == DASD_CQR_DONE)
6cc7f168 2193 rc = 0;
eb6e199b
SW		 2194 else if (maincqr->intrc)
2195 rc = maincqr->intrc;
6cc7f168
SW		 2196 else
2197 rc = -EIO;
1da177e4
LT		 2198 return rc;
2199}
2200
eb6e199b
SW		 2201/*
2202 * Queue a request to the tail of the device ccw_queue and wait for
2203 * it's completion.
2204 */
2205int dasd_sleep_on(struct dasd_ccw_req *cqr)
2206{
2207 return _dasd_sleep_on(cqr, 0);
2208}
2209
1da177e4 2210/*
8e09f215
SW		 2211 * Queue a request to the tail of the device ccw_queue and wait
2212 * interruptible for it's completion.
1da177e4 2213 */
8e09f215 2214int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
1da177e4 2215{
eb6e199b 2216 return _dasd_sleep_on(cqr, 1);
1da177e4
LT		 2217}
2218
2219/*
2220 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
2221 * for eckd devices) the currently running request has to be terminated
2222 * and be put back to status queued, before the special request is added
2223 * to the head of the queue. Then the special request is waited on normally.
2224 */
8e09f215 2225static inline int _dasd_term_running_cqr(struct dasd_device *device)
1da177e4
LT		 2226{
2227 struct dasd_ccw_req *cqr;
aade6c0d 2228 int rc;
1da177e4
LT		 2229
2230 if (list_empty(&device->ccw_queue))
2231 return 0;
8e09f215 2232 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
aade6c0d
SH		 2233 rc = device->discipline->term_IO(cqr);
2234 if (!rc)
2235 /*
2236 * CQR terminated because a more important request is pending.
2237 * Undo decreasing of retry counter because this is
2238 * not an error case.
2239 */
2240 cqr->retries++;
2241 return rc;
1da177e4
LT		 2242}
2243
8e09f215 2244int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
1da177e4 2245{
1da177e4
LT		 2246 struct dasd_device *device;
2247 int rc;
138c014d 2248
8e09f215 2249 device = cqr->startdev;
5a27e60d
SW		 2250 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2251 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2252 cqr->status = DASD_CQR_FAILED;
2253 cqr->intrc = -EPERM;
2254 return -EIO;
2255 }
1da177e4
LT		 2256 spin_lock_irq(get_ccwdev_lock(device->cdev));
2257 rc = _dasd_term_running_cqr(device);
2258 if (rc) {
2259 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2260 return rc;
2261 }
1da177e4 2262 cqr->callback = dasd_wakeup_cb;
1c1e093c 2263 cqr->callback_data = DASD_SLEEPON_START_TAG;
1da177e4 2264 cqr->status = DASD_CQR_QUEUED;
8e09f215 2265 list_add(&cqr->devlist, &device->ccw_queue);
138c014d 2266
1da177e4 2267 /* let the bh start the request to keep them in order */
8e09f215 2268 dasd_schedule_device_bh(device);
138c014d 2269
1da177e4
LT		 2270 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2271
c80ee724 2272 wait_event(generic_waitq, _wait_for_wakeup(cqr));
138c014d 2273
6cc7f168
SW		 2274 if (cqr->status == DASD_CQR_DONE)
2275 rc = 0;
2276 else if (cqr->intrc)
2277 rc = cqr->intrc;
2278 else
2279 rc = -EIO;
1da177e4
LT		 2280 return rc;
2281}
2282
2283/*
2284 * Cancels a request that was started with dasd_sleep_on_req.
2285 * This is useful to timeout requests. The request will be
2286 * terminated if it is currently in i/o.
2287 * Returns 1 if the request has been terminated.
8e09f215
SW		 2288 * 0 if there was no need to terminate the request (not started yet)
2289 * negative error code if termination failed
2290 * Cancellation of a request is an asynchronous operation! The calling
2291 * function has to wait until the request is properly returned via callback.
1da177e4 2292 */
8e09f215 2293int dasd_cancel_req(struct dasd_ccw_req *cqr)
1da177e4 2294{
8e09f215 2295 struct dasd_device *device = cqr->startdev;
1da177e4
LT		 2296 unsigned long flags;
2297 int rc;
2298
2299 rc = 0;
2300 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2301 switch (cqr->status) {
2302 case DASD_CQR_QUEUED:
8e09f215
SW		 2303 /* request was not started - just set to cleared */
2304 cqr->status = DASD_CQR_CLEARED;
1da177e4
LT		 2305 break;
2306 case DASD_CQR_IN_IO:
2307 /* request in IO - terminate IO and release again */
8e09f215
SW		 2308 rc = device->discipline->term_IO(cqr);
2309 if (rc) {
fc19f381
SH		 2310 dev_err(&device->cdev->dev,
2311 "Cancelling request %p failed with rc=%d\n",
2312 cqr, rc);
8e09f215
SW		 2313 } else {
2314 cqr->stopclk = get_clock();
8e09f215 2315 }
1da177e4 2316 break;
8e09f215 2317 default: /* already finished or clear pending - do nothing */
1da177e4 2318 break;
8e09f215
SW		 2319 }
2320 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2321 dasd_schedule_device_bh(device);
2322 return rc;
2323}
2324
2325
2326/*
2327 * SECTION: Operations of the dasd_block layer.
2328 */
2329
2330/*
2331 * Timeout function for dasd_block. This is used when the block layer
2332 * is waiting for something that may not come reliably, (e.g. a state
2333 * change interrupt)
2334 */
2335static void dasd_block_timeout(unsigned long ptr)
2336{
2337 unsigned long flags;
2338 struct dasd_block *block;
2339
2340 block = (struct dasd_block *) ptr;
2341 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
2342 /* re-activate request queue */
eb6e199b 2343 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
8e09f215
SW		 2344 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
2345 dasd_schedule_block_bh(block);
2346}
2347
2348/*
2349 * Setup timeout for a dasd_block in jiffies.
2350 */
2351void dasd_block_set_timer(struct dasd_block *block, int expires)
2352{
48cae885
SW		 2353 if (expires == 0)
2354 del_timer(&block->timer);
2355 else
2356 mod_timer(&block->timer, jiffies + expires);
8e09f215
SW		 2357}
2358
2359/*
2360 * Clear timeout for a dasd_block.
2361 */
2362void dasd_block_clear_timer(struct dasd_block *block)
2363{
48cae885 2364 del_timer(&block->timer);
8e09f215
SW		 2365}
2366
8e09f215
SW		 2367/*
2368 * Process finished error recovery ccw.
2369 */
eb6e199b
SW		 2370static void __dasd_process_erp(struct dasd_device *device,
2371 struct dasd_ccw_req *cqr)
8e09f215
SW		 2372{
2373 dasd_erp_fn_t erp_fn;
8e09f215
SW		 2374
2375 if (cqr->status == DASD_CQR_DONE)
2376 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
2377 else
fc19f381 2378 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
8e09f215
SW		 2379 erp_fn = device->discipline->erp_postaction(cqr);
2380 erp_fn(cqr);
2381}
1da177e4 2382
8e09f215
SW		 2383/*
2384 * Fetch requests from the block device queue.
2385 */
2386static void __dasd_process_request_queue(struct dasd_block *block)
2387{
2388 struct request_queue *queue;
2389 struct request *req;
2390 struct dasd_ccw_req *cqr;
2391 struct dasd_device *basedev;
2392 unsigned long flags;
2393 queue = block->request_queue;
2394 basedev = block->base;
2395 /* No queue ? Then there is nothing to do. */
2396 if (queue == NULL)
2397 return;
2398
2399 /*
2400 * We requeue request from the block device queue to the ccw
2401 * queue only in two states. In state DASD_STATE_READY the
2402 * partition detection is done and we need to requeue requests
2403 * for that. State DASD_STATE_ONLINE is normal block device
2404 * operation.
2405 */
97f604b0
SW		 2406 if (basedev->state < DASD_STATE_READY) {
2407 while ((req = blk_fetch_request(block->request_queue)))
2408 __blk_end_request_all(req, -EIO);
8e09f215 2409 return;
97f604b0 2410 }
8e09f215 2411 /* Now we try to fetch requests from the request queue */
7eaceacc 2412 while ((req = blk_peek_request(queue))) {
8e09f215
SW		 2413 if (basedev->features & DASD_FEATURE_READONLY &&
2414 rq_data_dir(req) == WRITE) {
2415 DBF_DEV_EVENT(DBF_ERR, basedev,
2416 "Rejecting write request %p",
2417 req);
9934c8c0 2418 blk_start_request(req);
40cbbb78 2419 __blk_end_request_all(req, -EIO);
8e09f215
SW		 2420 continue;
2421 }
2422 cqr = basedev->discipline->build_cp(basedev, block, req);
2423 if (IS_ERR(cqr)) {
2424 if (PTR_ERR(cqr) == -EBUSY)
2425 break; /* normal end condition */
2426 if (PTR_ERR(cqr) == -ENOMEM)
2427 break; /* terminate request queue loop */
2428 if (PTR_ERR(cqr) == -EAGAIN) {
2429 /*
2430 * The current request cannot be build right
2431 * now, we have to try later. If this request
2432 * is the head-of-queue we stop the device
2433 * for 1/2 second.
2434 */
2435 if (!list_empty(&block->ccw_queue))
2436 break;
eb6e199b
SW		 2437 spin_lock_irqsave(
2438 get_ccwdev_lock(basedev->cdev), flags);
2439 dasd_device_set_stop_bits(basedev,
2440 DASD_STOPPED_PENDING);
2441 spin_unlock_irqrestore(
2442 get_ccwdev_lock(basedev->cdev), flags);
8e09f215
SW		 2443 dasd_block_set_timer(block, HZ/2);
2444 break;
2445 }
2446 DBF_DEV_EVENT(DBF_ERR, basedev,
2447 "CCW creation failed (rc=%ld) "
2448 "on request %p",
2449 PTR_ERR(cqr), req);
9934c8c0 2450 blk_start_request(req);
40cbbb78 2451 __blk_end_request_all(req, -EIO);
8e09f215
SW		 2452 continue;
2453 }
2454 /*
2455 * Note: callback is set to dasd_return_cqr_cb in
2456 * __dasd_block_start_head to cover erp requests as well
2457 */
2458 cqr->callback_data = (void *) req;
2459 cqr->status = DASD_CQR_FILLED;
9934c8c0 2460 blk_start_request(req);
8e09f215
SW		 2461 list_add_tail(&cqr->blocklist, &block->ccw_queue);
2462 dasd_profile_start(block, cqr, req);
2463 }
2464}
2465
2466static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
2467{
2468 struct request *req;
2469 int status;
4c4e2148 2470 int error = 0;
8e09f215
SW		 2471
2472 req = (struct request *) cqr->callback_data;
2473 dasd_profile_end(cqr->block, cqr, req);
fe6b8e76 2474 status = cqr->block->base->discipline->free_cp(cqr, req);
4c4e2148
KU		 2475 if (status <= 0)
2476 error = status ? status : -EIO;
40cbbb78 2477 __blk_end_request_all(req, error);
8e09f215
SW		 2478}
2479
2480/*
2481 * Process ccw request queue.
2482 */
2483static void __dasd_process_block_ccw_queue(struct dasd_block *block,
2484 struct list_head *final_queue)
2485{
2486 struct list_head *l, *n;
2487 struct dasd_ccw_req *cqr;
2488 dasd_erp_fn_t erp_fn;
2489 unsigned long flags;
2490 struct dasd_device *base = block->base;
2491
2492restart:
2493 /* Process request with final status. */
2494 list_for_each_safe(l, n, &block->ccw_queue) {
2495 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2496 if (cqr->status != DASD_CQR_DONE &&
2497 cqr->status != DASD_CQR_FAILED &&
2498 cqr->status != DASD_CQR_NEED_ERP &&
2499 cqr->status != DASD_CQR_TERMINATED)
2500 continue;
2501
2502 if (cqr->status == DASD_CQR_TERMINATED) {
2503 base->discipline->handle_terminated_request(cqr);
2504 goto restart;
2505 }
2506
2507 /* Process requests that may be recovered */
2508 if (cqr->status == DASD_CQR_NEED_ERP) {
6c5f57c7 2509 erp_fn = base->discipline->erp_action(cqr);
6a5176c4
SH		 2510 if (IS_ERR(erp_fn(cqr)))
2511 continue;
8e09f215
SW		 2512 goto restart;
2513 }
2514
a9cffb22
SH		 2515 /* log sense for fatal error */
2516 if (cqr->status == DASD_CQR_FAILED) {
2517 dasd_log_sense(cqr, &cqr->irb);
2518 }
2519
8e09f215
SW		 2520 /* First of all call extended error reporting. */
2521 if (dasd_eer_enabled(base) &&
2522 cqr->status == DASD_CQR_FAILED) {
2523 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
2524
2525 /* restart request */
2526 cqr->status = DASD_CQR_FILLED;
2527 cqr->retries = 255;
2528 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
eb6e199b 2529 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
8e09f215
SW		 2530 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
2531 flags);
2532 goto restart;
2533 }
2534
2535 /* Process finished ERP request. */
2536 if (cqr->refers) {
eb6e199b 2537 __dasd_process_erp(base, cqr);
8e09f215
SW		 2538 goto restart;
2539 }
2540
2541 /* Rechain finished requests to final queue */
2542 cqr->endclk = get_clock();
2543 list_move_tail(&cqr->blocklist, final_queue);
2544 }
2545}
2546
2547static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
2548{
2549 dasd_schedule_block_bh(cqr->block);
2550}
2551
2552static void __dasd_block_start_head(struct dasd_block *block)
2553{
2554 struct dasd_ccw_req *cqr;
2555
2556 if (list_empty(&block->ccw_queue))
2557 return;
2558 /* We allways begin with the first requests on the queue, as some
2559 * of previously started requests have to be enqueued on a
2560 * dasd_device again for error recovery.
2561 */
2562 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
2563 if (cqr->status != DASD_CQR_FILLED)
2564 continue;
5a27e60d
SW		 2565 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
2566 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2567 cqr->status = DASD_CQR_FAILED;
2568 cqr->intrc = -EPERM;
2569 dasd_schedule_block_bh(block);
2570 continue;
2571 }
8e09f215
SW		 2572 /* Non-temporary stop condition will trigger fail fast */
2573 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
2574 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2575 (!dasd_eer_enabled(block->base))) {
2576 cqr->status = DASD_CQR_FAILED;
2577 dasd_schedule_block_bh(block);
2578 continue;
2579 }
2580 /* Don't try to start requests if device is stopped */
2581 if (block->base->stopped)
2582 return;
2583
2584 /* just a fail safe check, should not happen */
2585 if (!cqr->startdev)
2586 cqr->startdev = block->base;
2587
2588 /* make sure that the requests we submit find their way back */
2589 cqr->callback = dasd_return_cqr_cb;
2590
2591 dasd_add_request_tail(cqr);
2592 }
2593}
2594
2595/*
2596 * Central dasd_block layer routine. Takes requests from the generic
2597 * block layer request queue, creates ccw requests, enqueues them on
2598 * a dasd_device and processes ccw requests that have been returned.
2599 */
2600static void dasd_block_tasklet(struct dasd_block *block)
2601{
2602 struct list_head final_queue;
2603 struct list_head *l, *n;
2604 struct dasd_ccw_req *cqr;
2605
2606 atomic_set(&block->tasklet_scheduled, 0);
2607 INIT_LIST_HEAD(&final_queue);
2608 spin_lock(&block->queue_lock);
2609 /* Finish off requests on ccw queue */
2610 __dasd_process_block_ccw_queue(block, &final_queue);
2611 spin_unlock(&block->queue_lock);
2612 /* Now call the callback function of requests with final status */
2613 spin_lock_irq(&block->request_queue_lock);
2614 list_for_each_safe(l, n, &final_queue) {
2615 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2616 list_del_init(&cqr->blocklist);
2617 __dasd_cleanup_cqr(cqr);
2618 }
2619 spin_lock(&block->queue_lock);
2620 /* Get new request from the block device request queue */
2621 __dasd_process_request_queue(block);
2622 /* Now check if the head of the ccw queue needs to be started. */
2623 __dasd_block_start_head(block);
2624 spin_unlock(&block->queue_lock);
2625 spin_unlock_irq(&block->request_queue_lock);
2626 dasd_put_device(block->base);
2627}
2628
2629static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2630{
2631 wake_up(&dasd_flush_wq);
2632}
2633
2634/*
2635 * Go through all request on the dasd_block request queue, cancel them
2636 * on the respective dasd_device, and return them to the generic
2637 * block layer.
2638 */
2639static int dasd_flush_block_queue(struct dasd_block *block)
2640{
2641 struct dasd_ccw_req *cqr, *n;
2642 int rc, i;
2643 struct list_head flush_queue;
2644
2645 INIT_LIST_HEAD(&flush_queue);
2646 spin_lock_bh(&block->queue_lock);
2647 rc = 0;
2648restart:
2649 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2650 /* if this request currently owned by a dasd_device cancel it */
2651 if (cqr->status >= DASD_CQR_QUEUED)
2652 rc = dasd_cancel_req(cqr);
2653 if (rc < 0)
2654 break;
2655 /* Rechain request (including erp chain) so it won't be
2656 * touched by the dasd_block_tasklet anymore.
2657 * Replace the callback so we notice when the request
2658 * is returned from the dasd_device layer.
2659 */
2660 cqr->callback = _dasd_wake_block_flush_cb;
2661 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2662 list_move_tail(&cqr->blocklist, &flush_queue);
2663 if (i > 1)
2664 /* moved more than one request - need to restart */
2665 goto restart;
2666 }
2667 spin_unlock_bh(&block->queue_lock);
2668 /* Now call the callback function of flushed requests */
2669restart_cb:
2670 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
2671 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
2672 /* Process finished ERP request. */
2673 if (cqr->refers) {
0cd4bd47 2674 spin_lock_bh(&block->queue_lock);
eb6e199b 2675 __dasd_process_erp(block->base, cqr);
0cd4bd47 2676 spin_unlock_bh(&block->queue_lock);
8e09f215
SW		 2677 /* restart list_for_xx loop since dasd_process_erp
2678 * might remove multiple elements */
2679 goto restart_cb;
2680 }
2681 /* call the callback function */
0cd4bd47 2682 spin_lock_irq(&block->request_queue_lock);
8e09f215
SW		 2683 cqr->endclk = get_clock();
2684 list_del_init(&cqr->blocklist);
2685 __dasd_cleanup_cqr(cqr);
0cd4bd47 2686 spin_unlock_irq(&block->request_queue_lock);
1da177e4 2687 }
1da177e4
LT		 2688 return rc;
2689}
2690
2691/*
8e09f215
SW		 2692 * Schedules a call to dasd_tasklet over the device tasklet.
2693 */
2694void dasd_schedule_block_bh(struct dasd_block *block)
2695{
2696 /* Protect against rescheduling. */
2697 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
2698 return;
2699 /* life cycle of block is bound to it's base device */
2700 dasd_get_device(block->base);
2701 tasklet_hi_schedule(&block->tasklet);
2702}
2703
2704
2705/*
2706 * SECTION: external block device operations
2707 * (request queue handling, open, release, etc.)
1da177e4
LT		 2708 */
2709
2710/*
2711 * Dasd request queue function. Called from ll_rw_blk.c
2712 */
8e09f215 2713static void do_dasd_request(struct request_queue *queue)
1da177e4 2714{
8e09f215 2715 struct dasd_block *block;
1da177e4 2716
8e09f215
SW		 2717 block = queue->queuedata;
2718 spin_lock(&block->queue_lock);
1da177e4 2719 /* Get new request from the block device request queue */
8e09f215 2720 __dasd_process_request_queue(block);
1da177e4 2721 /* Now check if the head of the ccw queue needs to be started. */
8e09f215
SW		 2722 __dasd_block_start_head(block);
2723 spin_unlock(&block->queue_lock);
1da177e4
LT		 2724}
2725
2726/*
2727 * Allocate and initialize request queue and default I/O scheduler.
2728 */
8e09f215 2729static int dasd_alloc_queue(struct dasd_block *block)
1da177e4
LT		 2730{
2731 int rc;
2732
8e09f215
SW		 2733 block->request_queue = blk_init_queue(do_dasd_request,
2734 &block->request_queue_lock);
2735 if (block->request_queue == NULL)
1da177e4
LT		 2736 return -ENOMEM;
2737
8e09f215 2738 block->request_queue->queuedata = block;
1da177e4 2739
8e09f215 2740 elevator_exit(block->request_queue->elevator);
08a8a0c5 2741 block->request_queue->elevator = NULL;
8e09f215 2742 rc = elevator_init(block->request_queue, "deadline");
1da177e4 2743 if (rc) {
8e09f215 2744 blk_cleanup_queue(block->request_queue);
1da177e4
LT		 2745 return rc;
2746 }
2747 return 0;
2748}
2749
2750/*
2751 * Allocate and initialize request queue.
2752 */
8e09f215 2753static void dasd_setup_queue(struct dasd_block *block)
1da177e4
LT		 2754{
2755 int max;
2756
e4dbb0f2
SH		 2757 if (block->base->features & DASD_FEATURE_USERAW) {
2758 /*
2759 * the max_blocks value for raw_track access is 256
2760 * it is higher than the native ECKD value because we
2761 * only need one ccw per track
2762 * so the max_hw_sectors are
2763 * 2048 x 512B = 1024kB = 16 tracks
2764 */
2765 max = 2048;
2766 } else {
2767 max = block->base->discipline->max_blocks << block->s2b_shift;
2768 }
2769 blk_queue_logical_block_size(block->request_queue,
2770 block->bp_block);
086fa5ff 2771 blk_queue_max_hw_sectors(block->request_queue, max);
8a78362c 2772 blk_queue_max_segments(block->request_queue, -1L);
f3eb5384
SW		 2773 /* with page sized segments we can translate each segement into
2774 * one idaw/tidaw
2775 */
2776 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
2777 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
1da177e4
LT		 2778}
2779
2780/*
2781 * Deactivate and free request queue.
2782 */
8e09f215 2783static void dasd_free_queue(struct dasd_block *block)
1da177e4 2784{
8e09f215
SW		 2785 if (block->request_queue) {
2786 blk_cleanup_queue(block->request_queue);
2787 block->request_queue = NULL;
1da177e4
LT		 2788 }
2789}
2790
2791/*
2792 * Flush request on the request queue.
2793 */
8e09f215 2794static void dasd_flush_request_queue(struct dasd_block *block)
1da177e4
LT		 2795{
2796 struct request *req;
2797
8e09f215 2798 if (!block->request_queue)
1da177e4 2799 return;
138c014d 2800
8e09f215 2801 spin_lock_irq(&block->request_queue_lock);
9934c8c0 2802 while ((req = blk_fetch_request(block->request_queue)))
40cbbb78 2803 __blk_end_request_all(req, -EIO);
8e09f215 2804 spin_unlock_irq(&block->request_queue_lock);
1da177e4
LT		 2805}
2806
57a7c0bc 2807static int dasd_open(struct block_device *bdev, fmode_t mode)
1da177e4 2808{
9eb25122 2809 struct dasd_device *base;
1da177e4
LT		 2810 int rc;
2811
65f8da47
SW		 2812 base = dasd_device_from_gendisk(bdev->bd_disk);
2813 if (!base)
9eb25122
SH		 2814 return -ENODEV;
2815
65f8da47 2816 atomic_inc(&base->block->open_count);
8e09f215 2817 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
1da177e4
LT		 2818 rc = -ENODEV;
2819 goto unlock;
2820 }
2821
8e09f215 2822 if (!try_module_get(base->discipline->owner)) {
1da177e4
LT		 2823 rc = -EINVAL;
2824 goto unlock;
2825 }
2826
2827 if (dasd_probeonly) {
fc19f381
SH		 2828 dev_info(&base->cdev->dev,
2829 "Accessing the DASD failed because it is in "
2830 "probeonly mode\n");
1da177e4
LT		 2831 rc = -EPERM;
2832 goto out;
2833 }
2834
8e09f215
SW		 2835 if (base->state <= DASD_STATE_BASIC) {
2836 DBF_DEV_EVENT(DBF_ERR, base, " %s",
1da177e4
LT		 2837 " Cannot open unrecognized device");
2838 rc = -ENODEV;
2839 goto out;
2840 }
2841
33b62a30
SW		 2842 if ((mode & FMODE_WRITE) &&
2843 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
2844 (base->features & DASD_FEATURE_READONLY))) {
2845 rc = -EROFS;
2846 goto out;
2847 }
2848
65f8da47 2849 dasd_put_device(base);
1da177e4
LT		 2850 return 0;
2851
2852out:
8e09f215 2853 module_put(base->discipline->owner);
1da177e4 2854unlock:
65f8da47
SW		 2855 atomic_dec(&base->block->open_count);
2856 dasd_put_device(base);
1da177e4
LT		 2857 return rc;
2858}
2859
57a7c0bc 2860static int dasd_release(struct gendisk *disk, fmode_t mode)
1da177e4 2861{
65f8da47 2862 struct dasd_device *base;
1da177e4 2863
65f8da47
SW		 2864 base = dasd_device_from_gendisk(disk);
2865 if (!base)
2866 return -ENODEV;
2867
2868 atomic_dec(&base->block->open_count);
2869 module_put(base->discipline->owner);
2870 dasd_put_device(base);
1da177e4
LT		 2871 return 0;
2872}
2873
a885c8c4
CH		 2874/*
2875 * Return disk geometry.
2876 */
8e09f215 2877static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
a885c8c4 2878{
8e09f215 2879 struct dasd_device *base;
a885c8c4 2880
65f8da47
SW		 2881 base = dasd_device_from_gendisk(bdev->bd_disk);
2882 if (!base)
a885c8c4
CH		 2883 return -ENODEV;
2884
8e09f215 2885 if (!base->discipline ||
65f8da47
SW		 2886 !base->discipline->fill_geometry) {
2887 dasd_put_device(base);
a885c8c4 2888 return -EINVAL;
65f8da47
SW		 2889 }
2890 base->discipline->fill_geometry(base->block, geo);
2891 geo->start = get_start_sect(bdev) >> base->block->s2b_shift;
2892 dasd_put_device(base);
a885c8c4
CH		 2893 return 0;
2894}
2895
83d5cde4 2896const struct block_device_operations
1da177e4
LT		 2897dasd_device_operations = {
2898 .owner = THIS_MODULE,
57a7c0bc
AV		 2899 .open = dasd_open,
2900 .release = dasd_release,
0000d031
HC		 2901 .ioctl = dasd_ioctl,
2902 .compat_ioctl = dasd_ioctl,
a885c8c4 2903 .getgeo = dasd_getgeo,
1da177e4
LT		 2904};
2905
8e09f215
SW		 2906/*******************************************************************************
2907 * end of block device operations
2908 */
1da177e4
LT		 2909
2910static void
2911dasd_exit(void)
2912{
2913#ifdef CONFIG_PROC_FS
2914 dasd_proc_exit();
2915#endif
20c64468 2916 dasd_eer_exit();
6bb0e010
HH		 2917 if (dasd_page_cache != NULL) {
2918 kmem_cache_destroy(dasd_page_cache);
2919 dasd_page_cache = NULL;
2920 }
1da177e4
LT		 2921 dasd_gendisk_exit();
2922 dasd_devmap_exit();
1da177e4
LT		 2923 if (dasd_debug_area != NULL) {
2924 debug_unregister(dasd_debug_area);
2925 dasd_debug_area = NULL;
2926 }
4fa52aa7 2927 dasd_statistics_removeroot();
1da177e4
LT		 2928}
2929
2930/*
2931 * SECTION: common functions for ccw_driver use
2932 */
2933
33b62a30
SW		 2934/*
2935 * Is the device read-only?
2936 * Note that this function does not report the setting of the
2937 * readonly device attribute, but how it is configured in z/VM.
2938 */
2939int dasd_device_is_ro(struct dasd_device *device)
2940{
2941 struct ccw_dev_id dev_id;
2942 struct diag210 diag_data;
2943 int rc;
2944
2945 if (!MACHINE_IS_VM)
2946 return 0;
2947 ccw_device_get_id(device->cdev, &dev_id);
2948 memset(&diag_data, 0, sizeof(diag_data));
2949 diag_data.vrdcdvno = dev_id.devno;
2950 diag_data.vrdclen = sizeof(diag_data);
2951 rc = diag210(&diag_data);
2952 if (rc == 0 || rc == 2) {
2953 return diag_data.vrdcvfla & 0x80;
2954 } else {
2955 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
2956 dev_id.devno, rc);
2957 return 0;
2958 }
2959}
2960EXPORT_SYMBOL_GPL(dasd_device_is_ro);
2961
f3445a1a
CH		 2962static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
2963{
2964 struct ccw_device *cdev = data;
2965 int ret;
2966
2967 ret = ccw_device_set_online(cdev);
2968 if (ret)
2969 pr_warning("%s: Setting the DASD online failed with rc=%d\n",
2970 dev_name(&cdev->dev), ret);
f3445a1a
CH		 2971}
2972
1c01b8a5
HH		 2973/*
2974 * Initial attempt at a probe function. this can be simplified once
2975 * the other detection code is gone.
2976 */
8e09f215
SW		 2977int dasd_generic_probe(struct ccw_device *cdev,
2978 struct dasd_discipline *discipline)
1da177e4
LT		 2979{
2980 int ret;
2981
2982 ret = dasd_add_sysfs_files(cdev);
2983 if (ret) {
b8ed5dd5
SH		 2984 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
2985 "dasd_generic_probe: could not add "
2986 "sysfs entries");
40545573 2987 return ret;
1da177e4 2988 }
40545573 2989 cdev->handler = &dasd_int_handler;
1da177e4 2990
40545573
HH		 2991 /*
2992 * Automatically online either all dasd devices (dasd_autodetect)
2993 * or all devices specified with dasd= parameters during
2994 * initial probe.
2995 */
2996 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
2a0217d5 2997 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
f3445a1a 2998 async_schedule(dasd_generic_auto_online, cdev);
de3e0da1 2999 return 0;
1da177e4
LT		 3000}
3001
1c01b8a5
HH		 3002/*
3003 * This will one day be called from a global not_oper handler.
3004 * It is also used by driver_unregister during module unload.
3005 */
8e09f215 3006void dasd_generic_remove(struct ccw_device *cdev)
1da177e4
LT		 3007{
3008 struct dasd_device *device;
8e09f215 3009 struct dasd_block *block;
1da177e4 3010
59afda78
HH		 3011 cdev->handler = NULL;
3012
1da177e4
LT		 3013 dasd_remove_sysfs_files(cdev);
3014 device = dasd_device_from_cdev(cdev);
3015 if (IS_ERR(device))
3016 return;
3017 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3018 /* Already doing offline processing */
3019 dasd_put_device(device);
3020 return;
3021 }
3022 /*
3023 * This device is removed unconditionally. Set offline
3024 * flag to prevent dasd_open from opening it while it is
3025 * no quite down yet.
3026 */
3027 dasd_set_target_state(device, DASD_STATE_NEW);
3028 /* dasd_delete_device destroys the device reference. */
8e09f215 3029 block = device->block;
1da177e4 3030 dasd_delete_device(device);
8e09f215
SW		 3031 /*
3032 * life cycle of block is bound to device, so delete it after
3033 * device was safely removed
3034 */
3035 if (block)
3036 dasd_free_block(block);
1da177e4
LT		 3037}
3038
1c01b8a5
HH		 3039/*
3040 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
1da177e4 3041 * the device is detected for the first time and is supposed to be used
1c01b8a5
HH		 3042 * or the user has started activation through sysfs.
3043 */
8e09f215
SW		 3044int dasd_generic_set_online(struct ccw_device *cdev,
3045 struct dasd_discipline *base_discipline)
1da177e4 3046{
aa88861f 3047 struct dasd_discipline *discipline;
1da177e4 3048 struct dasd_device *device;
c6eb7b77 3049 int rc;
f24acd45 3050
40545573
HH		 3051 /* first online clears initial online feature flag */
3052 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
1da177e4
LT		 3053 device = dasd_create_device(cdev);
3054 if (IS_ERR(device))
3055 return PTR_ERR(device);
3056
aa88861f 3057 discipline = base_discipline;
c6eb7b77 3058 if (device->features & DASD_FEATURE_USEDIAG) {
1da177e4 3059 if (!dasd_diag_discipline_pointer) {
fc19f381
SH		 3060 pr_warning("%s Setting the DASD online failed because "
3061 "of missing DIAG discipline\n",
3062 dev_name(&cdev->dev));
1da177e4
LT		 3063 dasd_delete_device(device);
3064 return -ENODEV;
3065 }
3066 discipline = dasd_diag_discipline_pointer;
3067 }
aa88861f
PO		 3068 if (!try_module_get(base_discipline->owner)) {
3069 dasd_delete_device(device);
3070 return -EINVAL;
3071 }
3072 if (!try_module_get(discipline->owner)) {
3073 module_put(base_discipline->owner);
3074 dasd_delete_device(device);
3075 return -EINVAL;
3076 }
3077 device->base_discipline = base_discipline;
1da177e4
LT		 3078 device->discipline = discipline;
3079
8e09f215 3080 /* check_device will allocate block device if necessary */
1da177e4
LT		 3081 rc = discipline->check_device(device);
3082 if (rc) {
fc19f381
SH		 3083 pr_warning("%s Setting the DASD online with discipline %s "
3084 "failed with rc=%i\n",
3085 dev_name(&cdev->dev), discipline->name, rc);
aa88861f
PO		 3086 module_put(discipline->owner);
3087 module_put(base_discipline->owner);
1da177e4
LT		 3088 dasd_delete_device(device);
3089 return rc;
3090 }
3091
3092 dasd_set_target_state(device, DASD_STATE_ONLINE);
3093 if (device->state <= DASD_STATE_KNOWN) {
fc19f381
SH		 3094 pr_warning("%s Setting the DASD online failed because of a "
3095 "missing discipline\n", dev_name(&cdev->dev));
1da177e4
LT		 3096 rc = -ENODEV;
3097 dasd_set_target_state(device, DASD_STATE_NEW);
8e09f215
SW		 3098 if (device->block)
3099 dasd_free_block(device->block);
1da177e4
LT		 3100 dasd_delete_device(device);
3101 } else
3102 pr_debug("dasd_generic device %s found\n",
2a0217d5 3103 dev_name(&cdev->dev));
589c74d5
SH		 3104
3105 wait_event(dasd_init_waitq, _wait_for_device(device));
3106
1da177e4 3107 dasd_put_device(device);
1da177e4
LT		 3108 return rc;
3109}
3110
8e09f215 3111int dasd_generic_set_offline(struct ccw_device *cdev)
1da177e4
LT		 3112{
3113 struct dasd_device *device;
8e09f215 3114 struct dasd_block *block;
dafd87aa 3115 int max_count, open_count;
1da177e4
LT		 3116
3117 device = dasd_device_from_cdev(cdev);
3118 if (IS_ERR(device))
3119 return PTR_ERR(device);
3120 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3121 /* Already doing offline processing */
3122 dasd_put_device(device);
3123 return 0;
3124 }
3125 /*
3126 * We must make sure that this device is currently not in use.
3127 * The open_count is increased for every opener, that includes
3128 * the blkdev_get in dasd_scan_partitions. We are only interested
3129 * in the other openers.
3130 */
8e09f215 3131 if (device->block) {
a806170e
HC		 3132 max_count = device->block->bdev ? 0 : -1;
3133 open_count = atomic_read(&device->block->open_count);
8e09f215
SW		 3134 if (open_count > max_count) {
3135 if (open_count > 0)
fc19f381
SH		 3136 pr_warning("%s: The DASD cannot be set offline "
3137 "with open count %i\n",
3138 dev_name(&cdev->dev), open_count);
8e09f215 3139 else
fc19f381
SH		 3140 pr_warning("%s: The DASD cannot be set offline "
3141 "while it is in use\n",
3142 dev_name(&cdev->dev));
8e09f215
SW		 3143 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3144 dasd_put_device(device);
3145 return -EBUSY;
3146 }
1da177e4
LT		 3147 }
3148 dasd_set_target_state(device, DASD_STATE_NEW);
3149 /* dasd_delete_device destroys the device reference. */
8e09f215 3150 block = device->block;
1da177e4 3151 dasd_delete_device(device);
8e09f215
SW		 3152 /*
3153 * life cycle of block is bound to device, so delete it after
3154 * device was safely removed
3155 */
3156 if (block)
3157 dasd_free_block(block);
1da177e4
LT		 3158 return 0;
3159}
3160
a4d26c6a
SW		 3161int dasd_generic_last_path_gone(struct dasd_device *device)
3162{
3163 struct dasd_ccw_req *cqr;
3164
3165 dev_warn(&device->cdev->dev, "No operational channel path is left "
3166 "for the device\n");
3167 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
3168 /* First of all call extended error reporting. */
3169 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3170
3171 if (device->state < DASD_STATE_BASIC)
3172 return 0;
3173 /* Device is active. We want to keep it. */
3174 list_for_each_entry(cqr, &device->ccw_queue, devlist)
3175 if ((cqr->status == DASD_CQR_IN_IO) ||
3176 (cqr->status == DASD_CQR_CLEAR_PENDING)) {
3177 cqr->status = DASD_CQR_QUEUED;
3178 cqr->retries++;
3179 }
3180 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
3181 dasd_device_clear_timer(device);
3182 dasd_schedule_device_bh(device);
3183 return 1;
3184}
3185EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
3186
3187int dasd_generic_path_operational(struct dasd_device *device)
3188{
3189 dev_info(&device->cdev->dev, "A channel path to the device has become "
3190 "operational\n");
3191 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
3192 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
3193 if (device->stopped & DASD_UNRESUMED_PM) {
3194 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
3195 dasd_restore_device(device);
3196 return 1;
3197 }
3198 dasd_schedule_device_bh(device);
3199 if (device->block)
3200 dasd_schedule_block_bh(device->block);
3201 return 1;
3202}
3203EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
3204
8e09f215 3205int dasd_generic_notify(struct ccw_device *cdev, int event)
1da177e4
LT		 3206{
3207 struct dasd_device *device;
1da177e4
LT		 3208 int ret;
3209
91c36919 3210 device = dasd_device_from_cdev_locked(cdev);
1da177e4
LT		 3211 if (IS_ERR(device))
3212 return 0;
1da177e4
LT		 3213 ret = 0;
3214 switch (event) {
3215 case CIO_GONE:
47593bfa 3216 case CIO_BOXED:
1da177e4 3217 case CIO_NO_PATH:
a4d26c6a
SW		 3218 device->path_data.opm = 0;
3219 device->path_data.ppm = 0;
3220 device->path_data.npm = 0;
3221 ret = dasd_generic_last_path_gone(device);
1da177e4
LT		 3222 break;
3223 case CIO_OPER:
1da177e4 3224 ret = 1;
a4d26c6a
SW		 3225 if (device->path_data.opm)
3226 ret = dasd_generic_path_operational(device);
1da177e4
LT		 3227 break;
3228 }
1da177e4
LT		 3229 dasd_put_device(device);
3230 return ret;
3231}
3232
a4d26c6a
SW		 3233void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
3234{
3235 int chp;
3236 __u8 oldopm, eventlpm;
3237 struct dasd_device *device;
3238
3239 device = dasd_device_from_cdev_locked(cdev);
3240 if (IS_ERR(device))
3241 return;
3242 for (chp = 0; chp < 8; chp++) {
3243 eventlpm = 0x80 >> chp;
3244 if (path_event[chp] & PE_PATH_GONE) {
3245 oldopm = device->path_data.opm;
3246 device->path_data.opm &= ~eventlpm;
3247 device->path_data.ppm &= ~eventlpm;
3248 device->path_data.npm &= ~eventlpm;
3249 if (oldopm && !device->path_data.opm)
3250 dasd_generic_last_path_gone(device);
3251 }
3252 if (path_event[chp] & PE_PATH_AVAILABLE) {
3253 device->path_data.opm &= ~eventlpm;
3254 device->path_data.ppm &= ~eventlpm;
3255 device->path_data.npm &= ~eventlpm;
3256 device->path_data.tbvpm |= eventlpm;
3257 dasd_schedule_device_bh(device);
3258 }
3259 }
3260 dasd_put_device(device);
3261}
3262EXPORT_SYMBOL_GPL(dasd_generic_path_event);
3263
3264int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
3265{
3266 if (!device->path_data.opm && lpm) {
3267 device->path_data.opm = lpm;
3268 dasd_generic_path_operational(device);
3269 } else
3270 device->path_data.opm |= lpm;
3271 return 0;
3272}
3273EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
3274
3275
d41dd122
SH		 3276int dasd_generic_pm_freeze(struct ccw_device *cdev)
3277{
3278 struct dasd_ccw_req *cqr, *n;
3279 int rc;
3280 struct list_head freeze_queue;
3281 struct dasd_device *device = dasd_device_from_cdev(cdev);
3282
3283 if (IS_ERR(device))
3284 return PTR_ERR(device);
6f272b9c
SH		 3285
3286 if (device->discipline->freeze)
3287 rc = device->discipline->freeze(device);
3288
d41dd122 3289 /* disallow new I/O */
eb6e199b 3290 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
d41dd122
SH		 3291 /* clear active requests */
3292 INIT_LIST_HEAD(&freeze_queue);
3293 spin_lock_irq(get_ccwdev_lock(cdev));
3294 rc = 0;
3295 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
3296 /* Check status and move request to flush_queue */
3297 if (cqr->status == DASD_CQR_IN_IO) {
3298 rc = device->discipline->term_IO(cqr);
3299 if (rc) {
3300 /* unable to terminate requeust */
3301 dev_err(&device->cdev->dev,
3302 "Unable to terminate request %p "
3303 "on suspend\n", cqr);
3304 spin_unlock_irq(get_ccwdev_lock(cdev));
3305 dasd_put_device(device);
3306 return rc;
3307 }
3308 }
3309 list_move_tail(&cqr->devlist, &freeze_queue);
3310 }
3311
3312 spin_unlock_irq(get_ccwdev_lock(cdev));
3313
3314 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
3315 wait_event(dasd_flush_wq,
3316 (cqr->status != DASD_CQR_CLEAR_PENDING));
3317 if (cqr->status == DASD_CQR_CLEARED)
3318 cqr->status = DASD_CQR_QUEUED;
3319 }
3320 /* move freeze_queue to start of the ccw_queue */
3321 spin_lock_irq(get_ccwdev_lock(cdev));
3322 list_splice_tail(&freeze_queue, &device->ccw_queue);
3323 spin_unlock_irq(get_ccwdev_lock(cdev));
3324
d41dd122
SH		 3325 dasd_put_device(device);
3326 return rc;
3327}
3328EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
3329
3330int dasd_generic_restore_device(struct ccw_device *cdev)
3331{
3332 struct dasd_device *device = dasd_device_from_cdev(cdev);
3333 int rc = 0;
3334
3335 if (IS_ERR(device))
3336 return PTR_ERR(device);
3337
e6125fba 3338 /* allow new IO again */
eb6e199b
SW		 3339 dasd_device_remove_stop_bits(device,
3340 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
e6125fba 3341
d41dd122 3342 dasd_schedule_device_bh(device);
d41dd122 3343
eb6e199b
SW		 3344 /*
3345 * call discipline restore function
3346 * if device is stopped do nothing e.g. for disconnected devices
3347 */
3348 if (device->discipline->restore && !(device->stopped))
d41dd122 3349 rc = device->discipline->restore(device);
eb6e199b 3350 if (rc || device->stopped)
e6125fba
SH		 3351 /*
3352 * if the resume failed for the DASD we put it in
3353 * an UNRESUMED stop state
3354 */
3355 device->stopped |= DASD_UNRESUMED_PM;
d41dd122 3356
6fca97a9
SH		 3357 if (device->block)
3358 dasd_schedule_block_bh(device->block);
3359
d41dd122 3360 dasd_put_device(device);
e6125fba 3361 return 0;
d41dd122
SH		 3362}
3363EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
3364
763968e2
HC		 3365static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
3366 void *rdc_buffer,
3367 int rdc_buffer_size,
68b781fe 3368 int magic)
17283b56
CH		 3369{
3370 struct dasd_ccw_req *cqr;
3371 struct ccw1 *ccw;
d9fa9441 3372 unsigned long *idaw;
17283b56
CH		 3373
3374 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
3375
3376 if (IS_ERR(cqr)) {
fc19f381
SH		 3377 /* internal error 13 - Allocating the RDC request failed*/
3378 dev_err(&device->cdev->dev,
3379 "An error occurred in the DASD device driver, "
3380 "reason=%s\n", "13");
17283b56
CH		 3381 return cqr;
3382 }
3383
3384 ccw = cqr->cpaddr;
3385 ccw->cmd_code = CCW_CMD_RDC;
d9fa9441
SH		 3386 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
3387 idaw = (unsigned long *) (cqr->data);
3388 ccw->cda = (__u32)(addr_t) idaw;
3389 ccw->flags = CCW_FLAG_IDA;
3390 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
3391 } else {
3392 ccw->cda = (__u32)(addr_t) rdc_buffer;
3393 ccw->flags = 0;
3394 }
17283b56 3395
d9fa9441 3396 ccw->count = rdc_buffer_size;
8e09f215
SW		 3397 cqr->startdev = device;
3398 cqr->memdev = device;
17283b56 3399 cqr->expires = 10*HZ;
eb6e199b 3400 cqr->retries = 256;
17283b56
CH		 3401 cqr->buildclk = get_clock();
3402 cqr->status = DASD_CQR_FILLED;
3403 return cqr;
3404}
3405
3406
68b781fe 3407int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
92636b15 3408 void *rdc_buffer, int rdc_buffer_size)
17283b56
CH		 3409{
3410 int ret;
3411 struct dasd_ccw_req *cqr;
3412
92636b15 3413 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
17283b56
CH		 3414 magic);
3415 if (IS_ERR(cqr))
3416 return PTR_ERR(cqr);
3417
3418 ret = dasd_sleep_on(cqr);
8e09f215 3419 dasd_sfree_request(cqr, cqr->memdev);
17283b56
CH		 3420 return ret;
3421}
aaff0f64 3422EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
20c64468 3423
f3eb5384
SW		 3424/*
3425 * In command mode and transport mode we need to look for sense
3426 * data in different places. The sense data itself is allways
3427 * an array of 32 bytes, so we can unify the sense data access
3428 * for both modes.
3429 */
3430char *dasd_get_sense(struct irb *irb)
3431{
3432 struct tsb *tsb = NULL;
3433 char *sense = NULL;
3434
3435 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
3436 if (irb->scsw.tm.tcw)
3437 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
3438 irb->scsw.tm.tcw);
3439 if (tsb && tsb->length == 64 && tsb->flags)
3440 switch (tsb->flags & 0x07) {
3441 case 1: /* tsa_iostat */
3442 sense = tsb->tsa.iostat.sense;
3443 break;
3444 case 2: /* tsa_ddpc */
3445 sense = tsb->tsa.ddpc.sense;
3446 break;
3447 default:
3448 /* currently we don't use interrogate data */
3449 break;
3450 }
3451 } else if (irb->esw.esw0.erw.cons) {
3452 sense = irb->ecw;
3453 }
3454 return sense;
3455}
3456EXPORT_SYMBOL_GPL(dasd_get_sense);
3457
8e09f215 3458static int __init dasd_init(void)
1da177e4
LT		 3459{
3460 int rc;
3461
3462 init_waitqueue_head(&dasd_init_waitq);
8f61701b 3463 init_waitqueue_head(&dasd_flush_wq);
c80ee724 3464 init_waitqueue_head(&generic_waitq);
1da177e4
LT		 3465
3466 /* register 'common' DASD debug area, used for all DBF_XXX calls */
361f494d 3467 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
1da177e4
LT		 3468 if (dasd_debug_area == NULL) {
3469 rc = -ENOMEM;
3470 goto failed;
3471 }
3472 debug_register_view(dasd_debug_area, &debug_sprintf_view);
b0035f12 3473 debug_set_level(dasd_debug_area, DBF_WARNING);
1da177e4
LT		 3474
3475 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
3476
3477 dasd_diag_discipline_pointer = NULL;
3478
4fa52aa7
SW		 3479 dasd_statistics_createroot();
3480
1da177e4
LT		 3481 rc = dasd_devmap_init();
3482 if (rc)
3483 goto failed;
3484 rc = dasd_gendisk_init();
3485 if (rc)
3486 goto failed;
3487 rc = dasd_parse();
3488 if (rc)
3489 goto failed;
20c64468
SW		 3490 rc = dasd_eer_init();
3491 if (rc)
3492 goto failed;
1da177e4
LT		 3493#ifdef CONFIG_PROC_FS
3494 rc = dasd_proc_init();
3495 if (rc)
3496 goto failed;
3497#endif
3498
3499 return 0;
3500failed:
fc19f381 3501 pr_info("The DASD device driver could not be initialized\n");
1da177e4
LT		 3502 dasd_exit();
3503 return rc;
3504}
3505
3506module_init(dasd_init);
3507module_exit(dasd_exit);
3508
3509EXPORT_SYMBOL(dasd_debug_area);
3510EXPORT_SYMBOL(dasd_diag_discipline_pointer);
3511
3512EXPORT_SYMBOL(dasd_add_request_head);
3513EXPORT_SYMBOL(dasd_add_request_tail);
3514EXPORT_SYMBOL(dasd_cancel_req);
8e09f215
SW		 3515EXPORT_SYMBOL(dasd_device_clear_timer);
3516EXPORT_SYMBOL(dasd_block_clear_timer);
1da177e4
LT		 3517EXPORT_SYMBOL(dasd_enable_device);
3518EXPORT_SYMBOL(dasd_int_handler);
3519EXPORT_SYMBOL(dasd_kfree_request);
3520EXPORT_SYMBOL(dasd_kick_device);
3521EXPORT_SYMBOL(dasd_kmalloc_request);
8e09f215
SW		 3522EXPORT_SYMBOL(dasd_schedule_device_bh);
3523EXPORT_SYMBOL(dasd_schedule_block_bh);
1da177e4 3524EXPORT_SYMBOL(dasd_set_target_state);
8e09f215
SW		 3525EXPORT_SYMBOL(dasd_device_set_timer);
3526EXPORT_SYMBOL(dasd_block_set_timer);
1da177e4
LT		 3527EXPORT_SYMBOL(dasd_sfree_request);
3528EXPORT_SYMBOL(dasd_sleep_on);
3529EXPORT_SYMBOL(dasd_sleep_on_immediatly);
3530EXPORT_SYMBOL(dasd_sleep_on_interruptible);
3531EXPORT_SYMBOL(dasd_smalloc_request);
3532EXPORT_SYMBOL(dasd_start_IO);
3533EXPORT_SYMBOL(dasd_term_IO);
3534
3535EXPORT_SYMBOL_GPL(dasd_generic_probe);
3536EXPORT_SYMBOL_GPL(dasd_generic_remove);
3537EXPORT_SYMBOL_GPL(dasd_generic_notify);
3538EXPORT_SYMBOL_GPL(dasd_generic_set_online);
3539EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
8e09f215
SW		 3540EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
3541EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
3542EXPORT_SYMBOL_GPL(dasd_alloc_block);
3543EXPORT_SYMBOL_GPL(dasd_free_block);
Linux kernel - Deliverables
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